The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.
Materials used in the production of dental bases, restorations, impressions, prostheses, etc.
Synthetic or natural materials, other than DRUGS, that are used to replace or repair any body TISSUES or bodily function.
Substances used to create an impression, or negative reproduction, of the teeth and dental arches. These materials include dental plasters and cements, metallic oxide pastes, silicone base materials, or elastomeric materials.
Substances and materials manufactured for use in various technologies and industries and for domestic use.
Instructional materials used in teaching.
Supplies used in building.
Characteristics or attributes of the outer boundaries of objects, including molecules.
Synthetic resins, containing an inert filler, that are widely used in dentistry.
Materials fabricated by BIOMIMETICS techniques, i.e., based on natural processes found in biological systems.
Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.
Elements of limited time intervals, contributing to particular results or situations.
Biocompatible materials usually used in dental and bone implants that enhance biologic fixation, thereby increasing the bond strength between the coated material and bone, and minimize possible biological effects that may result from the implant itself.
The generic term for salts derived from silica or the silicic acids. They contain silicon, oxygen, and one or more metals, and may contain hydrogen. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th Ed)
The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
Products made by baking or firing nonmetallic minerals (clay and similar materials). In making dental restorations or parts of restorations the material is fused porcelain. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Boucher's Clinical Dental Terminology, 4th ed)
The mechanical property of material that determines its resistance to force. HARDNESS TESTS measure this property.
Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
Polymers of high molecular weight which at some stage are capable of being molded and then harden to form useful components.
Acrylic acids or acrylates which are substituted in the C-2 position with a methyl group.
Silicon polymers that contain alternate silicon and oxygen atoms in linear or cyclic molecular structures.
A group of thermoplastic or thermosetting polymers containing polyisocyanate. They are used as ELASTOMERS, as coatings, as fibers and as foams.
Zirconium. A rather rare metallic element, atomic number 40, atomic weight 91.22, symbol Zr. (From Dorland, 28th ed)
Numerical expression indicating the measure of stiffness in a material. It is defined by the ratio of stress in a unit area of substance to the resulting deformation (strain). This allows the behavior of a material under load (such as bone) to be calculated.
Polymers of silicone that are formed by crosslinking and treatment with amorphous silica to increase strength. They have properties similar to vulcanized natural rubber, in that they stretch under tension, retract rapidly, and fully recover to their original dimensions upon release. They are used in the encapsulation of surgical membranes and implants.
The methyl esters of methacrylic acid that polymerize easily and are used as tissue cements, dental materials, and absorbent for biological substances.
A polymer obtained by reacting polyacrylic acid with a special anion-leachable glass (alumino-silicate). The resulting cement is more durable and tougher than others in that the materials comprising the polymer backbone do not leach out.
Inorganic compounds that contain calcium as an integral part of the molecule.
A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.
Methods of creating machines and devices.
Procedure of producing an imprint or negative likeness of the teeth and/or edentulous areas. Impressions are made in plastic material which becomes hardened or set while in contact with the tissue. They are later filled with plaster of Paris or artificial stone to produce a facsimile of the oral structures present. Impressions may be made of a full complement of teeth, of areas where some teeth have been removed, or in a mouth from which all teeth have been extracted. (Illustrated Dictionary of Dentistry, 1982)
Substances used to bond COMPOSITE RESINS to DENTAL ENAMEL and DENTIN. These bonding or luting agents are used in restorative dentistry, ROOT CANAL THERAPY; PROSTHODONTICS; and ORTHODONTICS.
A dark-gray, metallic element of widespread distribution but occurring in small amounts; atomic number, 22; atomic weight, 47.90; symbol, Ti; specific gravity, 4.5; used for fixation of fractures. (Dorland, 28th ed)
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
Materials which have structured components with at least one dimension in the range of 1 to 100 nanometers. These include NANOCOMPOSITES; NANOPARTICLES; NANOTUBES; and NANOWIRES.
Resistance and recovery from distortion of shape.
Materials used in closing a surgical or traumatic wound. (From Dorland, 28th ed)
A computer based method of simulating or analyzing the behavior of structures or components.
Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
The description and measurement of the various factors that produce physical stress upon dental restorations, prostheses, or appliances, materials associated with them, or the natural oral structures.
Condition of having pores or open spaces. This often refers to bones, bone implants, or bone cements, but can refer to the porous state of any solid substance.
Synthetic or natural materials for the replacement of bones or bone tissue. They include hard tissue replacement polymers, natural coral, hydroxyapatite, beta-tricalcium phosphate, and various other biomaterials. The bone substitutes as inert materials can be incorporated into surrounding tissue or gradually replaced by original tissue.
A broad family of synthetic organosiloxane polymers containing a repeating silicon-oxygen backbone with organic side groups attached via carbon-silicon bonds. Depending on their structure, they are classified as liquids, gels, and elastomers. (From Merck Index, 12th ed)
Poly-2-methylpropenoic acids. Used in the manufacture of methacrylate resins and plastics in the form of pellets and granules, as absorbent for biological materials and as filters; also as biological membranes and as hydrogens. Synonyms: methylacrylate polymer; poly(methylacrylate); acrylic acid methyl ester polymer.
An oxide of aluminum, occurring in nature as various minerals such as bauxite, corundum, etc. It is used as an adsorbent, desiccating agent, and catalyst, and in the manufacture of dental cements and refractories.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
Composite materials composed of an ion-leachable glass embedded in a polymeric matrix. They differ from GLASS IONOMER CEMENTS in that partially silanized glass particles are used to provide a direct bond to the resin matrix and the matrix is primarily formed by a light-activated, radical polymerization reaction.
Polymerized methyl methacrylate monomers which are used as sheets, moulding, extrusion powders, surface coating resins, emulsion polymers, fibers, inks, and films (From International Labor Organization, 1983). This material is also used in tooth implants, bone cements, and hard corneal contact lenses.
A basis of value established for the measure of quantity, weight, extent or quality, e.g. weight standards, standard solutions, methods, techniques, and procedures used in diagnosis and therapy.
Substances used to allow enhanced visualization of tissues.
Dental cements composed either of polymethyl methacrylate or dimethacrylate, produced by mixing an acrylic monomer liquid with acrylic polymers and mineral fillers. The cement is insoluble in water and is thus resistant to fluids in the mouth, but is also irritating to the dental pulp. It is used chiefly as a luting agent for fabricated and temporary restorations. (Jablonski's Dictionary of Dentistry, 1992, p159)
The reaction product of bisphenol A and glycidyl methacrylate that undergoes polymerization when exposed to ultraviolet light or mixed with a catalyst. It is used as a bond implant material and as the resin component of dental sealants and composite restorative materials.
Artificial substitutes for body parts, and materials inserted into tissue for functional, cosmetic, or therapeutic purposes. Prostheses can be functional, as in the case of artificial arms and legs, or cosmetic, as in the case of an artificial eye. Implants, all surgically inserted or grafted into the body, tend to be used therapeutically. IMPLANTS, EXPERIMENTAL is available for those used experimentally.
The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.
The maximum compression a material can withstand without failure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p427)
Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.
Material applied to the tissue side of a denture to provide a soft lining to the parts of a denture coming in contact with soft tissue. It cushions contact of the denture with the tissues.
Chemical reaction in which monomeric components are combined to form POLYMERS (e.g., POLYMETHYLMETHACRYLATE).
A test to determine the relative hardness of a metal, mineral, or other material according to one of several scales, such as Brinell, Mohs, Rockwell, Vickers, or Shore. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The properties, processes, and behavior of biological systems under the action of mechanical forces.
The evaluation of incidents involving the loss of function of a device. These evaluations are used for a variety of purposes such as to determine the failure rates, the causes of failures, costs of failures, and the reliability and maintainability of devices.
A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.
Water swollen, rigid, 3-dimensional network of cross-linked, hydrophilic macromolecules, 20-95% water. They are used in paints, printing inks, foodstuffs, pharmaceuticals, and cosmetics. (Grant & Hackh's Chemical Dictionary, 5th ed)
Nanometer-scale composite structures composed of organic molecules intimately incorporated with inorganic molecules. (Glossary of Biotechnology and Nanobiotechology Terms, 4th ed)
Binary compounds of oxygen containing the anion O(2-). The anion combines with metals to form alkaline oxides and non-metals to form acidic oxides.
A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A type of porcelain used in dental restorations, either jacket crowns or inlays, artificial teeth, or metal-ceramic crowns. It is essentially a mixture of particles of feldspar and quartz, the feldspar melting first and providing a glass matrix for the quartz. Dental porcelain is produced by mixing ceramic powder (a mixture of quartz, kaolin, pigments, opacifiers, a suitable flux, and other substances) with distilled water. (From Jablonski's Dictionary of Dentistry, 1992)
The hard portion of the tooth surrounding the pulp, covered by enamel on the crown and cementum on the root, which is harder and denser than bone but softer than enamel, and is thus readily abraded when left unprotected. (From Jablonski, Dictionary of Dentistry, 1992)
A prosthetic restoration that reproduces the entire surface anatomy of the visible natural crown of a tooth. It may be partial (covering three or more surfaces of a tooth) or complete (covering all surfaces). It is made of gold or other metal, porcelain, or resin.
Relating to the size of solids.
Used as a dental cement this is mainly zinc oxide (with strengtheners and accelerators) and eugenol. (Boucher's Clinical Dental Terminology, 4th ed, p50)
Polymers of organic acids and alcohols, with ester linkages--usually polyethylene terephthalate; can be cured into hard plastic, films or tapes, or fibers which can be woven into fabrics, meshes or velours.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
A class of statistical methods applicable to a large set of probability distributions used to test for correlation, location, independence, etc. In most nonparametric statistical tests, the original scores or observations are replaced by another variable containing less information. An important class of nonparametric tests employs the ordinal properties of the data. Another class of tests uses information about whether an observation is above or below some fixed value such as the median, and a third class is based on the frequency of the occurrence of runs in the data. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1284; Corsini, Concise Encyclopedia of Psychology, 1987, p764-5)
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)
The properties and processes of materials that affect their behavior under force.
The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.
An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation.
The plan and delineation of dental prostheses in general or a specific dental prosthesis. It does not include DENTURE DESIGN. The framework usually consists of metal.
Compounds similar to hydrocarbons in which a tetravalent silicon atom replaces the carbon atom. They are very reactive, ignite in air, and form useful derivatives.
Generating tissue in vitro for clinical applications, such as replacing wounded tissues or impaired organs. The use of TISSUE SCAFFOLDING enables the generation of complex multi-layered tissues and tissue structures.
Polymeric materials (usually organic) of large molecular weight which can be shaped by flow. Plastic usually refers to the final product with fillers, plasticizers, pigments, and stabilizers included (versus the resin, the homogeneous polymeric starting material). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Implants constructed of materials designed to be absorbed by the body without producing an immune response. They are usually composed of plastics and are frequently used in orthopedics and orthodontics.
The resistance that a gaseous or liquid system offers to flow when it is subjected to shear stress. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The mineral component of bones and teeth; it has been used therapeutically as a prosthetic aid and in the prevention and treatment of osteoporosis.
The quality or state of being able to be bent or creased repeatedly. (From Webster, 3d ed)
An adhesion procedure for orthodontic attachments, such as plastic DENTAL CROWNS. This process usually includes the application of an adhesive material (DENTAL CEMENTS) and letting it harden in-place by light or chemical curing.
Stainless steel. A steel containing Ni, Cr, or both. It does not tarnish on exposure and is used in corrosive environments. (Grant & Hack's Chemical Dictionary, 5th ed)
The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.
A polyvinyl resin used extensively in the manufacture of plastics, including medical devices, tubing, and other packaging. It is also used as a rubber substitute.
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
A hard thin translucent layer of calcified substance which envelops and protects the dentin of the crown of the tooth. It is the hardest substance in the body and is almost entirely composed of calcium salts. Under the microscope, it is composed of thin rods (enamel prisms) held together by cementing substance, and surrounded by an enamel sheath. (From Jablonski, Dictionary of Dentistry, 1992, p286)
Cell growth support structures composed of BIOCOMPATIBLE MATERIALS. They are specially designed solid support matrices for cell attachment in TISSUE ENGINEERING and GUIDED TISSUE REGENERATION uses.
Devices or objects in various imaging techniques used to visualize or enhance visualization by simulating conditions encountered in the procedure. Phantoms are used very often in procedures employing or measuring x-irradiation or radioactive material to evaluate performance. Phantoms often have properties similar to human tissue. Water demonstrates absorbing properties similar to normal tissue, hence water-filled phantoms are used to map radiation levels. Phantoms are used also as teaching aids to simulate real conditions with x-ray or ultrasonic machines. (From Iturralde, Dictionary and Handbook of Nuclear Medicine and Clinical Imaging, 1990)
The use of a layer of tooth-colored material, usually porcelain or acrylic resin, applied to the surface of natural teeth, crowns, or pontics by fusion, cementation, or mechanical retention.
Inorganic compounds that contain aluminum as an integral part of the molecule.
A mild astringent and topical protectant with some antiseptic action. It is also used in bandages, pastes, ointments, dental cements, and as a sunblock.
The visually perceived property of objects created by absorption or reflection of specific wavelengths of light.
Histochemical localization of immunoreactive substances using labeled antibodies as reagents.
Silicone polymers which consist of silicon atoms substituted with methyl groups and linked by oxygen atoms. They comprise a series of biocompatible materials used as liquids, gels or solids; as film for artificial membranes, gels for implants, and liquids for drug vehicles; and as antifoaming agents.
Polymeric resins derived from OXIRANES and characterized by strength and thermosetting properties. Epoxy resins are often used as dental materials.
A white powder prepared from lime that has many medical and industrial uses. It is in many dental formulations, especially for root canal filling.
Homopolymer of tetrafluoroethylene. Nonflammable, tough, inert plastic tubing or sheeting; used to line vessels, insulate, protect or lubricate apparatus; also as filter, coating for surgical implants or as prosthetic material. Synonyms: Fluoroflex; Fluoroplast; Ftoroplast; Halon; Polyfene; PTFE; Tetron.
A generic term for all substances having the properties of stretching under tension, high tensile strength, retracting rapidly, and recovering their original dimensions fully. They are generally POLYMERS.
Creation of a smooth and glossy surface finish on a denture or amalgam.
A continuous protein fiber consisting primarily of FIBROINS. It is synthesized by a variety of INSECTS and ARACHNIDS.
Method of tissue preparation in which the tissue specimen is frozen and then dehydrated at low temperature in a high vacuum. This method is also used for dehydrating pharmaceutical and food products.
The internal resistance of a material to moving some parts of it parallel to a fixed plane, in contrast to stretching (TENSILE STRENGTH) or compression (COMPRESSIVE STRENGTH). Ionic crystals are brittle because, when subjected to shear, ions of the same charge are brought next to each other, which causes repulsion.
Substances that cause the adherence of two surfaces. They include glues (properly collagen-derived adhesives), mucilages, sticky pastes, gums, resins, or latex.
Polyester polymers formed from terephthalic acid or its esters and ethylene glycol. They can be formed into tapes, films or pulled into fibers that are pressed into meshes or woven into fabrics.
Water-soluble low-molecular-weight polymers of acrylic or methacrylic acid that form solid, insoluble products when mixed with specially prepared ZnO powder. The resulting cement adheres to dental enamel and is also used as a luting agent.
An operation in which carious material is removed from teeth and biomechanically correct forms are established in the teeth to receive and retain restorations. A constant requirement is provision for prevention of failure of the restoration through recurrence of decay or inadequate resistance to applied stresses. (Boucher's Clinical Dental Terminology, 4th ed, p239-40)
The marking of biological material with a dye or other reagent for the purpose of identifying and quantitating components of tissues, cells or their extracts.
The degree of approximation or fit of filling material or dental prosthetic to the tooth surface. A close marginal adaptation and seal at the interface is important for successful dental restorations.
Coagulated exudate isolated from several species of the tropical tree Palaquium (Sapotaceae). It is the trans-isomer of natural rubber and is used as a filling and impression material in dentistry and orthopedics and as an insulator in electronics. It has also been used as a rubber substitute.
Occlusal wear of the surfaces of restorations and surface wear of dentures.
Calcium salts of phosphoric acid. These compounds are frequently used as calcium supplements.
The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.
Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.
Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.
Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.
Improvement of the quality of a picture by various techniques, including computer processing, digital filtering, echocardiographic techniques, light and ultrastructural MICROSCOPY, fluorescence spectrometry and microscopy, scintigraphy, and in vitro image processing at the molecular level.
Propylene or propene polymers. Thermoplastics that can be extruded into fibers, films or solid forms. They are used as a copolymer in plastics, especially polyethylene. The fibers are used for fabrics, filters and surgical sutures.
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
A system for verifying and maintaining a desired level of quality in a product or process by careful planning, use of proper equipment, continued inspection, and corrective action as required. (Random House Unabridged Dictionary, 2d ed)
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
Removal and pathologic examination of specimens in the form of small pieces of tissue from the living body.
The hardening or polymerization of bonding agents (DENTAL CEMENTS) via exposure to light.
A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions.
Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.
The sum of the weight of all the atoms in a molecule.
Colloids with a solid continuous phase and liquid as the dispersed phase; gels may be unstable when, due to temperature or other cause, the solid phase liquefies; the resulting colloid is called a sol.
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
Improvement in the quality of an x-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed.
Organic-inorganic hybrid polymers developed primarily for DENTAL RESTORATION. They typically contain a defined mixture of ORGANOSILICON COMPOUNDS; CERAMICS; and organic POLYMERS.
In vitro method for producing large amounts of specific DNA or RNA fragments of defined length and sequence from small amounts of short oligonucleotide flanking sequences (primers). The essential steps include thermal denaturation of the double-stranded target molecules, annealing of the primers to their complementary sequences, and extension of the annealed primers by enzymatic synthesis with DNA polymerase. The reaction is efficient, specific, and extremely sensitive. Uses for the reaction include disease diagnosis, detection of difficult-to-isolate pathogens, mutation analysis, genetic testing, DNA sequencing, and analyzing evolutionary relationships.
A polysaccharide with glucose units linked as in CELLOBIOSE. It is the chief constituent of plant fibers, cotton being the purest natural form of the substance. As a raw material, it forms the basis for many derivatives used in chromatography, ion exchange materials, explosives manufacturing, and pharmaceutical preparations.
Chronic inflammation and granuloma formation around irritating foreign bodies.
The escape of diagnostic or therapeutic material from the vessel into which it is introduced into the surrounding tissue or body cavity.
The ability of a substance to be dissolved, i.e. to form a solution with another substance. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Polymers of ETHYLENE OXIDE and water, and their ethers. They vary in consistency from liquid to solid depending on the molecular weight indicated by a number following the name. They are used as SURFACTANTS, dispersing agents, solvents, ointment and suppository bases, vehicles, and tablet excipients. Some specific groups are NONOXYNOLS, OCTOXYNOLS, and POLOXAMERS.
Study of intracellular distribution of chemicals, reaction sites, enzymes, etc., by means of staining reactions, radioactive isotope uptake, selective metal distribution in electron microscopy, or other methods.
Substances made up of an aggregation of small particles, as that obtained by grinding or trituration of a solid drug. In pharmacy it is a form in which substances are administered. (From Dorland, 28th ed)
Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
An effective non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiographic procedures. Its low systemic toxicity is the combined result of low chemotoxicity and low osmolality.
Specific alloys not less than 85% chromium and nickel or cobalt, with traces of either nickel or cobalt, molybdenum, and other substances. They are used in partial dentures, orthopedic implants, etc.
The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821)
An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
Printed publications usually having a format with no binding and no cover and having fewer than some set number of pages. They are often devoted to a single subject.
An interdisciplinary field in materials science, ENGINEERING, and BIOLOGY, studying the use of biological principles for synthesis or fabrication of BIOMIMETIC MATERIALS.
Electron microscopy in which the ELECTRONS or their reaction products that pass down through the specimen are imaged below the plane of the specimen.
The study, control, and application of the conduction of ELECTRICITY through gases or vacuum, or through semiconducting or conducting materials. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight [28.084; 28.086].
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The placing of a body or a part thereof into a liquid.
Predetermined sets of questions used to collect data - clinical data, social status, occupational group, etc. The term is often applied to a self-completed survey instrument.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.
Renewal or repair of lost bone tissue. It excludes BONY CALLUS formed after BONE FRACTURES but not yet replaced by hard bone.
Preparatory activities in ROOT CANAL THERAPY by partial or complete extirpation of diseased pulp, cleaning and sterilization of the empty canal, enlarging and shaping the canal to receive the sealing material. The cavity may be prepared by mechanical, sonic, chemical, or other means. (From Dorland, 28th ed, p1700)
Magnesium oxide (MgO). An inorganic compound that occurs in nature as the mineral periclase. In aqueous media combines quickly with water to form magnesium hydroxide. It is used as an antacid and mild laxative and has many nonmedicinal uses.
The quality or state of being wettable or the degree to which something can be wet. This is also the ability of any solid surface to be wetted when in contact with a liquid whose surface tension is reduced so that the liquid spreads over the surface of the solid.
Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.
Chromatography on non-ionic gels without regard to the mechanism of solute discrimination.
Cements that act through infiltration and polymerization within the dentinal matrix and are used for dental restoration. They can be adhesive resins themselves, adhesion-promoting monomers, or polymerization initiators that act in concert with other agents to form a dentin-bonding system.
The outermost layer of a cell in most PLANTS; BACTERIA; FUNGI; and ALGAE. The cell wall is usually a rigid structure that lies external to the CELL MEMBRANE, and provides a protective barrier against physical or chemical agents.
Presence of warmth or heat or a temperature notably higher than an accustomed norm.
The discarding or destroying of garbage, sewage, or other waste matter or its transformation into something useful or innocuous.
Chemicals and substances that impart color including soluble dyes and insoluble pigments. They are used in INKS; PAINTS; and as INDICATORS AND REAGENTS.
Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.
The space in a tooth bounded by the dentin and containing the dental pulp. The portion of the cavity within the crown of the tooth is the pulp chamber; the portion within the root is the pulp canal or root canal.
Inability or inadequacy of a dental restoration or prosthesis to perform as expected.
Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN.
Biocompatible materials placed into (endosseous) or onto (subperiosteal) the jawbone to support a crown, bridge, or artificial tooth, or to stabilize a diseased tooth.
Diamond. A crystalline form of carbon that occurs as hard, colorless or tinted isomeric crystals. It is used as a precious stone, for cutting glass, and as bearings for delicate mechanisms. (From Grant & Hackh's Chemical Dictionary, 5th ed)
The study of the energy of electrons ejected from matter by the photoelectric effect, i.e., as a direct result of absorption of energy from electromagnetic radiation. As the energies of the electrons are characteristic of a specific element, the measurement of the energy of these electrons is a technique used to determine the chemical composition of surfaces.
Nanometer-sized tubes composed mainly of CARBON. Such nanotubes are used as probes for high-resolution structural and chemical imaging of biomolecules with ATOMIC FORCE MICROSCOPY.
One of the three domains of life (the others being Eukarya and ARCHAEA), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by cell division, and exhibit three principal forms: round or coccal, rodlike or bacillary, and spiral or spirochetal. Bacteria can be classified by their response to OXYGEN: aerobic, anaerobic, or facultatively anaerobic; by the mode by which they obtain their energy: chemotrophy (via chemical reaction) or PHOTOTROPHY (via light reaction); for chemotrophs by their source of chemical energy: CHEMOLITHOTROPHY (from inorganic compounds) or chemoorganotrophy (from organic compounds); and by their source for CARBON; NITROGEN; etc.; HETEROTROPHY (from organic sources) or AUTOTROPHY (from CARBON DIOXIDE). They can also be classified by whether or not they stain (based on the structure of their CELL WALLS) with CRYSTAL VIOLET dye: gram-negative or gram-positive.
Alloys that contain a high percentage of gold. They are used in restorative or prosthetic dentistry.
A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations.
A polypeptide substance comprising about one third of the total protein in mammalian organisms. It is the main constituent of SKIN; CONNECTIVE TISSUE; and the organic substance of bones (BONE AND BONES) and teeth (TOOTH).
Tissue that supports and binds other tissues. It consists of CONNECTIVE TISSUE CELLS embedded in a large amount of EXTRACELLULAR MATRIX.
A process of separating particulate matter from a fluid, such as air or a liquid, by passing the fluid carrier through a medium that will not pass the particulates. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Substances that inhibit or arrest DENTAL CARIES formation. (Boucher's Clinical Dental Terminology, 4th ed)
Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.
Procedures for collecting, preserving, and transporting of specimens sufficiently stable to provide accurate and precise results suitable for clinical interpretation.

Development of calcium phosphate cement for rapid crystallization to apatite. (1/4659)

The purpose of this study was to develop an alpha-tricalcium phosphate (alpha-TCP) cement which transforms to hydroxyapatite (HAP) in a relatively short period. We used calcium and phosphate solutions as the liquid phase for the alpha-TCP cement. The alpha-TCP powder was first mixed with CaCl2 solution, and then mixed with NaH2PO4 or Na2HPO3 solution for a total powder/liquid ratio of 1.8. The setting time became shorter with the increase in the concentration of calcium and phosphate solutions, reaching 5 min, whereas the setting time was longer than 30 min when distilled water was used as the liquid phase. X-ray diffraction analysis revealed that the cement was mostly transformed to HAP within 24 h when kept in an incubator. We concluded that alpha-TCP should be mixed with calcium and phosphate solutions since this results in a moderate setting time and fast transformation to HAP even if the method of mixing becomes a little complex.  (+info)

Steric effects of N-acyl group in O-methacryloyl-N-acyl tyrosines on the adhesiveness of unetched human dentin. (2/4659)

We have prepared various O-methacryloyl-N-acyl tyrosines (MAATY) to reveal the relationship between molecular structure near carboxylic acid and adhesive strength of MAATY-HEMA type adhesive resin to unetched dentin. In this study, we attempted to change the steric hindrance effect without changing the HLB value, i.e., introducing an iso-acyl group instead of n-acyl group into MAATY. O-methacryloyl-N-ethylbutyryl tyrosine (MIHTY) showed significantly lower adhesive strength when compared with O-methacryloyl-N-hexanoyl tyrosine even though both MAATY have the same HLB value. The possible explanation of the significantly different adhesive strength was that the 2-ethylbutyryl group in MIHTY was bulky, resulting in inhibition of the hydrogen bonding of the carboxylic group. The HLB value is independent of the steric effect of molecular structure, and thus the steric factor should be taken into consideration for the explanation of different adhesive strengths within the adhesive monomers having the same HLB value but different molecular structures.  (+info)

Fatigue and tensile strength of dental gallium alloys after artificial saliva immersion. (3/4659)

Fatigue strength using the stair-case method and tensile strength of dental gallium alloys after artificial saliva immersion were measured for evaluating the effects of corrosive environment storage on the mechanical properties of the gallium alloys. The fatigue and the tensile strengths of both gallium alloys stored in artificial saliva were significantly decreased after 12-month storage, while those stored in air increased with storage period. The fracture surfaces of the specimens in artificial saliva showed not only metallic luster but also dark areas. In the dark area, the matrix might have dissolved during immersion. These results suggested that the concern over corrosion resistance of gallium alloys still remained.  (+info)

Adhesion of adhesive resin to dental precious metal alloys. Part I. New precious metal alloys with base metals for resin bonding. (4/4659)

New dental precious metal alloys for resin bonding without alloy surface modification were developed by adding base metals (In, Zn, or Sn). Before this, binary alloys of Au, Ag, Cu, or Pd containing In, Zn, or Sn were studied for water durability and bonding strength with 4-META resin. The adhesion ability of the binary alloys was improved by adding In equivalent to 15% of Au content, Zn equivalent to 20% of Ag content, and In, Zn, or Sn equivalent to 5% of Cu content. There was no addition effect of the base metals on Pd, however 15% of In addition improved adhesion with Pd-based alloys containing equi-atomic % of Cu and Pd. The alloy surfaces were analyzed by XPS and showed that oxides such as In2O3, ZnO, or SnO play an important role in improving the adhesive ability of the alloys.  (+info)

Marginal adaptation of commercial compomers in dentin cavity. (5/4659)

The dentin cavity adaptation and setting characteristics of four commercial compomers were evaluated by measuring the wall-to-wall contraction gap width in the cylindrical dentin cavity and measuring the compressive strength for a maximum of 14 days after setting. The dentin cavity wall was pretreated by the dentin adhesives according to each manufacturer's instructions or the experimental contraction gap-free dentin bonding system. Complete marginal integrity was obtained in only one compomer and two resin composites which were combined with the experimental dentin bonding system. The compressive strength of two resin composites and two compomers ten minutes after setting was comparable to that after 14 days which indicated that the compomers exhibited setting characteristics as rapidly as the resin composite. It was concluded that a high efficacy dentin bonding system is required for commercial compomers to prevent gap formation during irradiation caused by the rapid setting shrinkage.  (+info)

Influence of archwire and bracket dimensions on sliding mechanics: derivations and determinations of the critical contact angles for binding. (6/4659)

There is every indication that classical friction controls sliding mechanics below some critical contact angle, theta c. Once that angle is exceeded, however, binding and notching phenomena increasingly restrict sliding mechanics. Using geometric archwire and bracket parameters, the theta c is calculated as the boundary between classical frictional behaviour and binding-related phenomena. What these equations predict is independent of practitioner or technique. From these derivations two dimensionless numbers are also identified as the bracket and the engagement index. The first shows how the width of a bracket compares to its Slot; the second indicates how completely the wire fills the Slot. When nominal wire and bracket dimensions are calculated for both standard Slots, the maximum theta c theoretically equals 3.7 degrees. Thus, knowledge of the archwire or bracket alone is insufficient; knowledge of the archwire-bracket combination is necessary for theta c to be calculated. Once calculated, sliding mechanics should be initiated only after the contact angle, theta, approaches the characteristic value of theta c for the particular archwire-bracket combination of choice--that is, when theta approximately theta c.  (+info)

An ex vivo investigation into the bond strength of orthodontic brackets and adhesive systems. (7/4659)

The aim of this study was to compare the shear bond strength of Adhesive Precoated Brackets (APC) with that of two types of uncoated bracket bases, Straight-Wire and Dyna-Lock. Two types of orthodontic adhesives were used, Transbond XT and Right-On. Three different curing times were evaluated with the APC brackets in order to find the best. Adhesive remnants on the enamel surface following debond were evaluated using the Adhesive Remnant Index (Artun and Bergland, 1984). Bond strengths ranged from 11.00 to 22.08 MPa. For both types of brackets Transbond produced a significant increase in bond strength compared to Right-On. The Dyna-Lock/Right-On combination produced the poorest results. APC brackets cured for 40 s had similar bond strengths to uncoated brackets fixed by means of Transbond. Overall, 79 per cent of specimens had less than half the tooth surface covered with adhesive following debond. Significantly more adhesive remained on tooth surfaces following debond of the Straight-Wire/Right-On group than any other bracket/adhesive combination. Bond strengths were higher with light-cured Transbond than with chemically-cured Right-On. When Transbond is used in association with APC brackets a 40-second cure time is recommended.  (+info)

Effect of permeability on indices of haemodialysis membrane biocompatibility. (8/4659)

BACKGROUND: Increases in plasma anaphylatoxins frequently are used as an index of haemodialysis membrane biocompatibility; however, their plasma levels may be influenced by the loss of anaphylatoxins into the dialysate compartment. METHODS: We compared the generation and compartmental distribution of anaphylatoxins, C3a and C5a, in a high flux and a low flux polysulfone membrane dialyser when whole human blood was recirculated through an in vitro haemodialysis circuit. RESULTS: Plasma C3a levels in high flux polysulfone (2.31 +/- 0.81 microg/ml) and low flux polysulfone (3.02 +/- 0.98 microg/ml) dialysers were comparable after 120 min (P = NS). In contrast, dialysate C3a in high flux polysulfone (0.65 +/- 0.31 microg/ml) accounted for 37.5 +/- 7.0% of the total detected (plasma + dialysate) C3a mass in the dialysers, while dialysate C3a in low flux polysulfone dialysers (0.01 +/- 0.01 microg/ml) accounted for only 0.3 +/- 0.3% of the total mass (P < 0.05; high flux vs low flux). Anaphylatoxin C5a was undetectable in the dialysate compartment of either dialyser examined. CONCLUSIONS: Our results indicate that anaphylatoxins readily traverse certain high flux dialysis membranes; consequently, plasma C3a levels may not accurately reflect the C3-activating potential of these membranes.  (+info)

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PMID: 11203649 Purpose: Fatigue behavior of luting cement film between model fixed partial dentures (FPD) and their dies was investigated to gain a better understanding of the mechanical properties of zinc-phosphate cement. Materials and Methods: Fifty-six brass dies were made, half of them with grooves and half without grooves. A cantilever FPD for each die was cast in Au-Pd-Ag alloy. Four linear strain gauges were attached to the marginal portions of each retainer. The FPDs were cemented to the dies using zinc-phosphate cement. A fatigue test machine was used to cyclically load the specimens with 50 or 100 N for 5.5 3 105 cycles (1 Hz) in 37 C water. During the fatigue test, strain measurements were made after every 0.5 3 105 load cycles to discover if strain response was altered. After completion of the fatigue test, ultimate tensile strength of each specimen was measured and statistically analyzed by 2-way analysis of variance. Results: With or without grooves, strain responses were the same ...
Key Study: Safepharm, 2003- Examination of the test material structure,1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione, zinc salt (ZMB2), indicated that it was a zinc salt with the anion being a weak acid. It was therefore considered that the weak acid may associate with other cations of limited solubility leading to precipitation. As a result of this the maximum solubility of the test material in dechlorinated tap water was reduced by the presence of cations. In view of the difficulties associated with the evaluation of aquatic toxicity of poorly water soluble test materials, Safepharm, 2003, performed a modified version of the standard method for the preparation of aqueous media. An approach endorsed by several important regulatory authorities in the European Union and elsewhere (ECETOC 1996 and OECD 2000), is to expose organisms to a saturated solution of the test material in cases where the test material is of high purity and is poorly soluble in water and in the permitted auxiliary ...
Polyimide (PI) is a commonly used polymer in microelectronics. Recently, numerous PI-based flexible neural interfaces have been developed for reducing mechanical mismatch between rigid implant and soft neural tissue. Most approaches employ non-photosensitive PI, which has been proven earlier to be biocompatible. However, photosensitive polyimide (PSPI) would simplify device fabrication remarkably, but its biocompatibility has been only sparsely reported. In this study, cytotoxicity of spin-coated PSPI (HD Microsystems PI-2771) and conventional PI (HD Microsystems PI-2525) films were evaluated in vitro using BHK-21 fibroblasts according to the ISO-10993-5 standard. PSPIs were tested as cured at a temperature of 200 degrees C (PI-2771-200) and 350 degrees C (PI-2771-350). The PI film surfaces were characterized in terms of their roughness, energy and zeta potential which are hypothesized to affect cell-material interactions. The values of the total surface free energy (SFE), and its polar and ...
A sound knowledge of mechanical properties of rocks at high temperatures and pressures is essential for modelling volcanological problems such as fracture of lava flows and dike emplacement. In particular, fracture toughness is a scale-invariant material property of a rock that describes its resistance to tensile failure. A new fracture mechanics apparatus has been constructed enabling fracture toughness measurements on large (60 mm diameter) rock core samples at temperatures up to 750-C and pressures up to 50 MPa. We present a full description of this apparatus and, by plotting fracture resistance as a function of crack length, show that the size of the samples is sufficient for reliable fracture toughness measurements. A series of tests on Icelandic, Vesuvian and Etnean basalts at temperatures from 30 to 600-C and confining pressures up to 30 MPa gave fracture toughness values between 1.4 and 3.8 MPa m1=2. The Icelandic basalt is the strongest material and the Etnean material sampled from the ...
This is an intensive course covering the basic concepts of fracture mechanics and fatigue, with emphasis on practical applications for metals, ceramics, polymers and composites. The course is suitable for those with no previous formal introduction to the science of fracture and no prior knowledge or experience is assumed.. All topics will be introduced from first principles and the emphasis will be on developing an understanding of concepts of fracture mechanics rather than presenting a state-of-the-art review. Lectures will be given by experts in the field with experience of teaching this material to practising engineers and materials scientists on post-experience courses. Supervised examples classes will enable delegates to work on the solution of typical problems and discuss these with the lecturers.. ...
The purpose of the research was to study both the stress intensity and the energy criteria of elastic fractures in order to incorporate the couple-stress effect which is induced by high stress gradient. The high stress gradient will be present whenever there is discontinuity in material geometry or constitution. Initial effort was conducted on a systematic reviewing and evaluation of the couple-stress theory of elasticity and the elastic theory of fracture mechanics.(*FRACTURE(MECHANICS)
The short term toxicity of the test material to fish (Oncorhynchus mykiss) was investigated in a study conducted in accordance with the standardised guideline OECD 203 under GLP conditions. Rainbow trout were exposed to a limit value of the test material at a nominal concentration of 100 mg/L for 96 hours under static conditions. A control group was exposed to the dilution water under the same conditions. This was a limit of solubility test as the material was not soluble in water. The nominal solution was prepared and stirred overnight and allowed to stand for approximately 4 hours. The solution used in the test was transferred using a syphon to avoid the transference of any settled test material. Following 96 hours of exposure, no mortality or adverse effects were observed among fish exposed to the control or test material. The measured concentrations were very low and therefore the test was reported using the geometric mean measured test concentration. Under the conditions of the study, the ...
We are very happy to announce our new partnership with CSC China Standard Certification in Beijing and Qingdao. Together with our well experienced and established representation through Nanjing Langmuir Trading CO.,LTD, the new partnership and technical cooperation with CSC will allow us to contribute to the development of test materials and refinement of test concepts and standards in China.. ...
The flammability of the test material was investigated in accordance with the standardised guideline EU Method A.10 under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997). A preliminary screening test was performed and no propagation of combustion of the test material within 2 minutes was observed. This test was perrformed two times. Since the test material could not be ignited in the preliminary test, no main test was performed. Under the conditions of this study, the test material is considered not highly flammable. ...
We are very happy to announce our new partnership with CSC China Standard Certification in Beijing and Qingdao. Together with our well experienced and established representation through Nanjing Langmuir Trading CO.,LTD, the new partnership and technical cooperation with CSC will allow us to contribute to the development of test materials and refinement of test concepts and standards in China.. ...
TY - JOUR. T1 - Proficiency testing in immunopathology: establishing the homegeneity of test material. AU - Esterman, Adrian. AU - Javanovich, S. AU - McEvoy, Robert. AU - Roberts-Thomson, Peter. PY - 2005. Y1 - 2005. M3 - Article. VL - 37. SP - 164. EP - 168. JO - Pathology. JF - Pathology. SN - 0031-3025. IS - 2. ER - ...
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The early rapid proliferation of epithelium is a pre-requisite for the rapid healing of wound surface of epithelium. In the present tests, the epithelial cells used for identifying test materials are taken from normal human skin, and the cells are cultured and grow in media containing the silicon and calcium microparticles of the present invention prepared according to the process of the Example 2. The specific combinations of chemical ingredients are pre-added in to the cell culture media used in the present tests at the concentrations as depicted in the Table of Fig. 3. One group serves as a control. Experimental groups with the test materials are compared to said control group to determine the induction effect of the test materials on the growth of cells. During the culture procedure, the media are replaced with fresh media having the same specific compositions every four days. Cell proliferation tests are conducted on the 12th and 20th day by counting the total number of cells grown in media ...
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The objective of this work is to develop a solid scientific understanding of the creation and characteristics of surface fractures formed during the grinding and polishing of brittle materials, specifically glass. In this study, we have experimentally characterized the morphology, number density, and depth distribution of various surface cracks as a function of various grinding and polishing processes (blanchard, fixed abrasive grinding, loose abrasive, pitch polishing and pad polishing). Also, the effects of load, abrasive particle (size, distribution, foreign particles, geometry, velocity), and lap material (pitch, pad) were examined. The resulting data were evaluated in terms of indentation fracture mechanics and tribological interactions (science of interacting surfaces) leading to several models to explain crack distribution behavior of ground surfaces and to explain the characteristics of scratches formed during polishing. This project has greatly advanced the scientific knowledge of microscopic
Application of Fracture Mechanics to Polymers, Adhesives and Composites, Volume 33 (European Structural Integrity Society) by D R Moore
Fracture mechanics concepts are applied to gain some understanding of the hierarchical nanocomposite structures of hard biological tissues such as bone, tooth and shells. At the most elementary level...
The fracture mechanics parameter of the critical stress intensity factor (Kc) was determined by a modified compact tension test method, for the fracture of bovine tibia cortical bone at orientations of 0°, 15°, 30°, 45°, 75° and 90° to the bone axis. It was established that, for a given loading rate, a variation in orientation from 0-90° produced average increases in Kc from 3.2 to 6.5 MN m−3/2 ...
EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome...
(J. Soc. Mat. Sci., Japan), Vol. 52, No. 11, pp , Nov Fatigue Life Prediction of Coiled Tubing by Takanori KATO*, Miyuki YAMAMOTO*, Isao SAWAGUCHI** and Tetsuo YONEZAWA*** Coiled tubings,
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A column assembly for use in conjunction with a test machine, for inducing high-cycle fatigue (at kilohertz vibration rates) in a specimen of a material under test. The column assembly has isolation masses, a specimen grip, and two actuators, the latter for imparting dynamic forces to the test specimen. The actuators are arranged on the column assembly asymmetrically relative to the test specimen.
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Piglione A, Yu J, Zhao J, Xiao C, Dunne F, Pham MSet al., 2020, Micro-mechanisms of Cyclic Plasticity at Stress Concentrations in a Ni-Based Single-Crystal Superalloy, Pages: 333-340, ISSN: 2367-1181 Ni-based single-crystal superalloys are high-temperature materials used for turbine blades in jet engines. Fatigue damage can pose a major threat to the integrity of such components in operation. Traditionally, TEM-based studies on the fatigue behaviour of superalloys has been studied by investigating cyclic plasticity in the bulk of the material. When the cyclic loads are nominally elastic, however, such investigation may not contribute to the understanding of the alloys fatigue behaviour, since plastic micro-strains are confined to regions near stress raisers such as microstructural defects and are therefore randomly distributed. In turn, the plastic micro-strains near the critical stress raiser, i.e. the one that acts as nucleation site for the dominant crack, govern fatigue life by inducing ...
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To its credit, 20th Century Fox has been one of the most bullish contributors of content to the latest 4K Ultra HDTV medium, and the recent release of [amazon_textlink asin=B01LTIBWTO text=Logan template=ProductLink store=hc005-20′ marketplace=US link_id=8223ad90-4a43-11e7-b61a-9b62c8a74340′] on Ultra HD Blu-ray adds another tool to the stable of demonstration material to evaluate the evolving nature of Ultra HD displays.. I say this not because the Ultra HD Blu-ray version brings any revolutionary advances in the use of high dynamic range (HDR) specular highlights and expanded color gamut to tell the story - as the groundbreaking UHD Blu-ray version of Foxs The Revenant did. It doesnt even add a new HDR version like Dolby Vision - this is basic HDR10.. Instead, it is the removal of colors, by including black-&-white (B&W) versions of both the Ultra HD and the standard Blu-ray disc that gives us a chance to marvel (no pun intended) at the improvements that both 4K Ultra HD ...
In determining the fracture toughness of a test specimen, standards currently require either locally-measured load-line displacements or clip gage displacements. In order to measure these parameters, secondary sensors generally need to be installed and calibrated, which often comes at a higher cost. As crosshead displacements are automatically measured in most modern material test machines, use of the crosshead measurements alone would be less expensive. Although much criticism exists on the accuracy of this approach in determining CTOD values, the method can still prove sufficiently accurate for many applications. The current paper aims to assess the magnitude of the errors that arise from using the crosshead displacement in fracture mechanics testing of steels with the Single Edge Notched Bending (SENB) specimen geometry. The results show that for steels with sufficiently large toughness, the use of the crosshead displacement to calculate J and convert to CTOD produces results within 10% of ...
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F2183-02(2008) Standard Test Method for Small Punch Testing of Ultra-High Molecular Weight Polyethylene Used in Surgical Implants (Withdrawn 2017)
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In general, you cannot borrow test materials from the Education, Linguistics and Comparative Literature Library.. As a general rule, access to test libraries, test collections or test archives is restricted to authorised persons only due to reasons of test protection. (Authorised persons are: psychologists can access psychological tests; scholars in the area of education can access educational tests; linguists and students of the relevant degree programme can access language tests.). Other interested persons may only use test materials for information purposes in the area of research and teaching. They have to demonstrate their legitimate interest in writing. The access restriction on using test materials at the Education, Linguistics and Comparative Literature Library observes the applicable shipment restrictions of the publishers. Another objective is to prevent unauthorised people from viewing test items and sharing test items or test results or other relevant information. In extreme cases, ...
This paper investigates the mechanism of wear-particle generation when a single asperity is passed over the surface of UHMWPE. A single asperity is modelled using a conical diamond-tip indenter attached to a nano-scratch tester. Scratches are produced by passing the indenter over the surface of the polymer in a single pass and multiple passes on a single track or on orthogonally intersecting tracks. The debris-generation process, as observed in the nano-scratch test, is complex and depends upon the direction of scratches. It is found that the rate of wear-debris generation is much higher when two consecutive scratches orthogonally intersect each other compared to when the scratches are made on the same track. Wall formation was observed between orthogonally intersecting scratches, and it is believed that this is central to the low-cycle wear mechanism in these systems. © 2004 Springer Science+Business Media, Inc ...
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TY - JOUR. T1 - Synthesis, mechanical properties, and in vitro biocompatibility with osteoblasts of calcium silicate-reduced graphene oxide composites. AU - Mehrali, Mehdi. AU - Moghaddam, Ehsan. AU - Shirazi, Seyed Farid Seyed. AU - Baradaran, Saeid. AU - Mehrali, Mohammad. AU - Latibari, Sara Tahan. AU - Metselaar, Hendrik Simon Cornelis. AU - Kadri, Nahrizul Adib. AU - Zandi, Keivan. AU - Osman, Noor Azuan Abu. PY - 2014/3/26. Y1 - 2014/3/26. N2 - Calcium silicate (CaSiO3, CS) ceramics are promising bioactive materials for bone tissue engineering, particularly for bone repair. However, the low toughness of CS limits its application in load-bearing conditions. Recent findings indicating the promising biocompatibility of graphene imply that graphene can be used as an additive to improve the mechanical properties of composites. Here, we report a simple method for the synthesis of calcium silicate/reduced graphene oxide (CS/rGO) composites using a hydrothermal approach followed by hot isostatic ...
The Effect of Pressure-Induced Flow (PIF) Processing on the Thermal Stability and Mechanical Properties of Ultra-High Molecular Weight Polyethylene (UHMWPE) Gel
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The thermal fatigue behavior of the tantalum alloys T-111 (Ta-8W-2Hf) and ASTAR 811C (Ta-8W-1Re-0.7Hf-0.025C) has been evaluated using completely reversed push-pull fatigue tests conducted in ultrahigh vacuum with independently programmed temperature and strain cycles. Test results showed that cycling of the test temperature simultaneously with the mechanical strain in most cases significantly reduced the cycles to failure of both alloys compared to isothermal testing. Notched specimens had reduced lives under isothermal conditions, but the presence of a notch or use of a 1-h holdtime provided only a small further decrease in life for the temperature cycled tests. Compressive stress at the maximum temperature produced longer lives than tensile stress. ASTAR 811C was more fatigue resistant than T-111 isothermally and did not have as great a decrease in life with thermal cycling. Results are analyzed by partition of plastic strains into creep and creep-independent components and considering where ...
Tensile Strength Test Machine HD-B604:Tensile Strength Test Machine is designed for quick and reliable tensile, compression, bending, shear, peel, loop tack and fatigue cycling on metals...
In this paper, high strain rate compression properties of aramid and ultrahigh molecular weight polyethylene composites in the out-of-plane direction are tested at room temperature on a Split Hopkinson Pressure Bar apparatus. Tests were conducted on composites reinforced with woven or Uni-Directional (UD) fabrics made from aramid or ultrahigh molecular weight polyethylene as well as on composites reinforced with hybrid reinforcement. The strain rate is varied in the tests by changing the projectile shooting pressure. Four different pressures 2, 4, 6 and 8 bar were selected to change the strain rate. Stress-strain and energy absorption behaviour of eight type of samples were noted. Hybrid samples showed better performance in the energy absorption compared with other samples. © SAGE Publications ...
Ultimate tensile strength (UTS), often shortened to tensile strength (TS), ultimate strength, or Ftu within equations,[1][2][3] is the capacity of a material or structure to withstand loads tending to elongate, as opposed to compressive strength, which withstands loads tending to reduce size. In other words, tensile strength resists tension (being pulled apart), whereas compressive strength resists compression (being pushed together). Ultimate tensile strength is measured by the maximum stress that a material can withstand while being stretched or pulled before breaking. In the study of strength of materials, tensile strength, compressive strength, and shear strength can be analyzed independently. Some materials break very sharply, without plastic deformation, in what is called a brittle failure. Others, which are more ductile, including most metals, experience some plastic deformation and possibly necking before fracture. The UTS is usually found by performing a tensile test and recording the ...
Disclosed is a self-adhesive nonwoven elastic composite material composed of at least one elastic composite material; and a coating of a self-adhesive material on at least a portion of at least one exterior surface of the elastic composite material so that the material is capable of being compressed in the Z-direction at least about 45 percent at a pressure of about 3 psi to a thickness of not less than about 0.035 inch. The elastic composite material may contain an elastomeric nonwoven fibrous web joined to at least one relatively nonelastic gatherable material at spaced-apart locations so that the gatherable material is gathered between the spaced-apart locations. Such an elastic composite material can be coated with a self-adhesive material on at least a portion of at least one exterior surface of the elastic composite material so that the peel strength of the self-adhesive material is less than the peel strength of the layers of the elastic composite material. Also disclosed is a self-adhesive
April 1, 2019-Polymer composites are projected to increase in the automotive industry, MarketWatch reports. Polymer composites are materials with the combination of a polymer matrix and a reinforcing agent, mainly fibers (usually carbon, glass or natural fibers). The research report on Global Automotive Polymer Composites Market 2019 keenly analyzes significant features of the industry. The analysis servers market size, latest trends, drivers, threats, opportunities, as well as key market segments. It is based on past data and present market needs. Also, involve distinct business approaches accepted by the . . .
A test was performed to verify the mutagenic potentiol of the test material 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, tris(C12-13-branched-alkyl) ester on Salmonella typhimurium according to Ames B.N., McCann J. and Yamasaki E. (1975). The test was carried out on 5 strains of Salmonella typhimurium (TA 1535, TA 1537, TA1538, TA 98, TA 100). The mutagenic activity of the material was assessed by comparing the number of revertant colonies induced with the positive control. This activity was tested in the presence and absence of a metabolizing system and done directly in a petri dish. The test material was tested at concentrations of 100000, 10000, 1000, 100 and 10 µg/mL corresponding to doses of 10000, 1000, 100, 10 and 1 µg/petri dish. The results of the study can be summarized as follows: The test material at maximum concentration 10 mg/petri dish produced no increase in number of revertant colonies in comparison to the negative control. The result of the experiment with tester strain TA ...
TY - JOUR. T1 - Interface debond crack growth in tension-tension cyclic loading of single fiber polymer composites. AU - Pupurs, Andrejs AU - Goutianos, Stergios. AU - Brøndsted, Povl. AU - Varna, Janis. PY - 2013. Y1 - 2013. N2 - Fiber/matrix interface debond crack growth from a fiber break is defined as one of the key mechanisms of fatigue damage in unidirectional composites. Considering debond as an interface crack its growth in cyclic loading is analyzed utilizing a power law, where the debond growth rate is a power function of the change of the strain energy release rate in the cycle. To obtain values of two parameters in the power law cyclic loading of fragmented single fiber specimen is suggested. Measurements of the debond length increase with the number of load cycles in tension-tension fatigue are performed for glass fiber/epoxy single fiber composites. Analytical method in the steady-state growth region and FEM for short debonds are combined for calculating the strain energy release ...
The Corrositex® assay is a standardized and quantitative in vitro test developed as a replacement for the dermal corrosivity rabbit test. The Corrositex kit, manufactured by In Vitro International (IVI), uses a proprietary biobarrier membrane to model the skin for evaluating the potential dermal corrosivity of a test material. A test material is evaluated based on its penetration through the biobarrier membrane into a Chemical Detection System (CDS). The time required for the test material to break through the biobarrier and into the CDS is... Corrositex , Dermal , Skin Irritation Corrosion Screening , Skin Irritation Test ...
Introduction. The radiation crosslinking of ultra-high molecular weight polyethylene (UHMWPE) to enhance the properties of implants made from this polymer was reported as early as 1974 by Dumbleton.1 These studies were carried out at very high irradiation doses in air or nitrogen and resulted in excessive surface oxidation of the polymer and poor wear characteristics. The general radiation crosslinking of UHMWPE in the presence of gaseous mediating agents to enhance the mechanical properties of the polymer was reported as early as 1972 by Mitsui2 and in 1973 by Hagiwara.3. In order to reduce the required irradiation dose, authors 1 and 2 (Du Plessis and Grobbelaar) initiated a research and development programme in 1974 to investigate the potential of the radiation crosslinking of UHMWPE for application in orthopaedic prostheses by using a mediating gas or mixtures of mediating gases to enhance the degree of crosslinking of the UHMWPE and lower the required radiation dose. Almost 25 years later ...
his book concentrates on one area of testing - short-term mechanical tests. These are defined as tests of mechanical properties where the effects of long periods of time and cycling are ignored. This group of tests includes hardness, tensile, compression, shear, flexing, impact and tear and in this book it is also taken to include density and dimensional measurement together with test piece preparation and conditioning.
Post-irradiation melting of ultra-high molecular weight polyethylene (UHMWPE) reduced the oxidation potential of UHMWPE in vivo. After mid-term (5- 10 yrs) use in vivo, there is detectable oxidation in irradiated and melted joint implant retrievals. The absorption of the synovial fluid lipid squalene was identified as a possible factor initiating oxidation. We investigated the role of lipids in UHMWPE oxidation by asking: (1) Do other synovial fluid lipids initiate oxidation in irradiated and melted UHMWPE?; (2) What is the effect of the absorption of multiple lipids on UHMWPE oxidation?; (3) How does lipid-initiated oxidation in vitro compare to what is observed in long-term retrievals? We diffused emulsified single and mixed lipids into irradiated and melted UHMWPE and accelerated aged them ...
Integra made sure to raise its voice among extremities players in fiscal year 2016 (ended Dec. 31) by releasing the Cadence Total Ankle System. Cadence added to the Integras growing mix of ankle replacement products. The company made its foray into ankle replacement in 2015 by acquiring the Salto Talaris and Salto Talaris XT prostheses from Tornier, and Cadence complements this product line with several features to accommodate many patient anatomies. Cadences side-specific, anatomical tibial and talar components avoid fibular impingement and minimize resected talar bone to preserve the ankles vascularity. Further, Cadences bearing inserts are made from a highly crosslinked ultra-high molecular weight polyethylene (UHMWPE) to improve wear characteristics. Cadences first clinical use in the United States was achieved in April 2016, and in Europe in September ...
uniMorph is an enabling technology for rapid digital fabrication of customized thin-film shape-changing interfaces. By combining the thermoelectric characteristics of copper with the high thermal expansion rate of ultra-high molecular weight polyethylene, we are able to actuate the shape of flexible circuit composites directly. The shape-changing actuation is enabled by a temperature driven mechanism and reduces the complexity of fabrication for thin shape-changing interfaces.. UniMorph composites can be actuated by either environmental temperature changes or active heating of embedded structures and can actuate in different shape-changing primitives. Different sensing techniques that leverage the existing copper structures can be seamlessly embedded into the uniMorph composite.. ...
In vitro comparative cytotoxic and growth inhibitory effects of the methanol extracts of the leaf, stem and root barks of Cnidoscolus acontifolius (Mill.) Johnst (Euphorbiaceae)
The CoNextions TR is a stainless steel and ultra-high molecular weight polyethylene implant developed as an alternative to traditional suturing.
prepared on newly extracted teeth, and divided into the following groups: - First group: 10 samples of the total etch bonding agent [excite] with [Tetric ceram] composite resin were used. - Second group: 10 samples of the one step self etch bonding agent [one up bond f] with [estelite] composite resin were used. - Third group: 10 samples of the two step self etch bonding agent [Tyrian spe-one step] with [renew] composite resin were used. - Fourth group: 10 samples of the one step self etch bonding agent [Adper prompt L pop] with [z250] composite resin were used. All the laboratory samples were immersed in physiological serum for a week and exposed to 150 thermal cycles, All the samples then were stained with methylene blue, sectioned and studied with computer connected to the scanner. There was significant difference in the leakage levels between the gingival and the occlusal area. The leakage in the gingival wall was greater than in the occlusal wall. - The total etch adhesive [Excite] was ...
BioPointe filtered tips are manufactured in USA and are certified by an independent laboratory to be free of RNase, DNase, DNA and Pyrogens. Sterilization is done through an Electronic Beam Process that does not alter the color or make the plastic brittle. Manufactured only using the highest-grade of virgin polypropylene and implementing a unique thin-wall design Super Seal provides a soft, flexible material to effortlessly achieve optimal fit and seals on a variety of pipettors Molded with ultra-high molecular weight polyethylene, the filters are completely inert and consistent in porosity. This insures that the BioPointe filters will not impede airflow and will protect samples and pipettor from harmful contamination. Because BioPointe manufactures its filters in a clean-room facility, every component is free of detrimental nucleic acid and enzymes. BioPointe Scientific uses the highest quality plastics and best manufacturing practices to consistently produce a superior product. With its thin-wall
When Olympic hopefuls are sliding down icy tracks at speeds of 93 mph, those watching at the event or on television arent usually thinking about how the track was constructed, or what will happen to it when the Games are over.. But from a financial, environmental and engineering perspective, those questions are important-perhaps even more important than who wins the gold medal.. Thats why Purdue University professor Jan-Anders Mansson has been working for three years to engineer the ice out of Olympic sports like bobsled, luge and skeleton. Instead of the traditional ice, Mansson has proposed using an ultra-high molecular weight polyethylene to construct the surface of the 1.2-mile tracks.. Utilizing the same type of metal used to construct traditional ice tracks, the chosen polyethylene, a rotary device and a thermal camera, Mansson was able to accurately test the real-world sport at a representative laboratory scale.. In each experiment, the polyethylene-the winner out of 8 materials Mansson ...
The International Trade Commission has terminated without the imposition of import restrictions patent infringement investigation 337-TA-911 of certain lithium silicate materials and products containing the same, which can be processed and converted into dental restorative products such as crowns, inlays, onlays and bridges. This termination is based on a settlement agreement between complainants Ivoclar Vivadent AG, Ivoclar Vivadent Inc. and Ivoclar Vivadent Manufacturing Inc. and the respondents, which are located in Germany and the U.S.. ...
Uniaxial tension-unloading recovery, creep-recovery, and stress-controlled cyclic tests are first performed to investigate the recoverable viscoelasticity and irrecoverable viscoplasticity (including the uniaxial ratchetting) of ultrahigh molecular weight polyethylene (UHMWPE) polymer at room temperature. The results show that obvious time-dependent ratchetting occurs in the asymmetrical stress-controlled cyclic tension-compression and tension-tension tests of the UHMWPE, and total ratchetting strain consists of both recoverable viscoelastic and irrecoverable viscoplastic parts. Based on the experimental observation, a new viscoelastic-viscoplastic constitutive model is proposed to describe the time-dependent ratchetting of the UHMWPE. In the proposed model, the viscoplastic strain is set to be contributed simultaneously by the unified viscoplastic and creep ones. Meanwhile, a memory surface is introduced into the viscoelastic model to improve the description to the shapes of stress-strain ...
This study investigated the relationship between the irradiance transmitted through ceramic and the bond strength of a resin cement to dentin. After application of an adhesive system, elastomer molds with cylindrical orifices (1.2 mm in diameter) were placed onto bovine dentin surfaces and filled with a photoactivated luting agent (Enforce; Dentsply Caulk). Light-activation was performed through a 0.6-mm-thick ceramic disc using different intensities: 250, 400, 550, 700, or 850 MW/cm(2). Control specimens were irradiated without ceramic (1050 mW/cm(2)). The radiant exposure was kept at 30 J/cm(2). Light spectral distribution was analyzed with a spectrometer. Microshear test was conducted and modes of failure were classified under SEM. Bond strength data were analyzed with ANOVA and Student-Newman-Keuls test (alpha ,= 0.05), and failure scores with the Kruskal-Wallis test (alpha ,= 0.05). A linear regression model assessed the relationship between irradiance and bond strength. Groups lightcured ...
The load–deflection curve acquired from the Small Punch Test (SPT) is used to obtain the mechanical properties of materials using different correlation methods. The scattering level of these regressions tends to be high when a wide set of materials is analyzed. In this study, a correlation method based on a specific slope of the SPT curve was proposed to reduce scattering. Assuming the Ramberg–Osgood hardening law, the dependence of the SPT curve slope on the yield strength and the hardening coefficient is demonstrated by numerical simulations (FEM). Considering that the ultimate tensile strength could be obtained from the hardening coefficient, a response surface of the ultimate tensile strength with the yield strength and SPT curve slope, along with its equation, is presented for steel alloys. A summary of steel mechanical properties, based on the Boiler and Pressure Vessel Code (BPVC) and limited to yield strengths lower than 1300 MPa, is shown to select a set of experimental tests
Polymer Composites and Polymeric Materials for Energy Management and Occupant Safety by Society of Automotive Engineers, 9780768003802, available at Book Depository with free delivery worldwide.
The A1U10 group showed significantly lower mean hardness than the other two groups (A1U20 and A1U40) for the U surface of this composite resin shade (A1) (£0.05). At the L surface of A1 shade a significantly higher mean hardness was found at 40 s irradiation time (A1L40) than for the A1L10 and A1L20 groups, which means that values were also statistically different (p£0.05). Both surfaces (U and L) of A3 shade composite revealed significantly greater mean hardness values at 40 s curing time, followed by the 20-s and the 10-s curing time groups (p£0.05). Statistically significant differences were found between U and L surfaces of each composite shade-IT combination (p=0.0001) and among the irradiation times of same shade-surface combination (p=0.0001), except between A1U20 and A1U40 groups. DISCUSSION. The polymerization of light-cured composite resins starts and is sustained when the rate of delivery photons from the source of light is sufficient to maintain the photo-absorbing compound, ...
Figure: Induction of proinflammatory cytokines is attenuated in CX3CL1−/− mice expressing sFKN. TNFα and IL-1β concentrations were measured using standard ELISA techniques for VM lysates. a, TNFα concentrations were upregulated following MPTP administration (three-way ANOVA; F(1, 23) = 18.36, ★★★p , 0.001). Comparatively, CX3CL1−/− mice expressing sFKN in the SNpc had significantly lower concentrations of TNFα relative to mFKN (Tukeys HSD; ***p , 0.001) and GFP (Tukeys HSD; ###p , 0.001) expressing mice. There were no significant differences between sFKN and WT-MPTP (Tukeys HSD; p = 0.384) or mFKN and GFP (Tukeys HSD; p = 0.773). b, The IL-1β concentrations in the VM were significantly upregulated for mice exposed to MPTP (three-way ANOVA; F(1, 23) = 11.97, ★★★p = 0.002). Similar to the pattern of TNFα, IL-1β concentrations in CX3CL1−/− mice expressing sFKN were significantly blunted compared to both mFKN (Tukeys HSD; ***p = 0.001) and GFP (Tukeys HSD; ###p , ...
TY - JOUR. T1 - Effects of fiber surface treatments on mechanical properties of wood fiber-cement composites. AU - Blankenhorn, Paul R.. AU - Blankenhorn, Brad D.. AU - Silsbee, Michael R.. AU - DiCola, Maria. PY - 2001/7. Y1 - 2001/7. N2 - The purpose of this research was to determine the effects of treated and untreated hardwood, kraft softwood, and newsprint wood fibers on the 7- and 28-day bending strength, compressive strength, and toughness values for wood fiber-cement composites. Untreated and acrylic- or alkylalkoxysilane-treated hardwood, kraft softwood, and newsprint wood fibers used in wood fiber-cement composites resulted in different bending and compression properties. Fiber characteristics along with different chemical treatments influenced the composite properties. Compressive strength decreased for all fiber types and chemical treatments compared to the neat cement controls. Bending strength values for all wood fiber composites were higher than the neat cement control specimens. ...
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BACKGROUND: Assessing liver fibrosis is traditionally performed by biopsy, an imperfect gold standard. Non-invasive techniques, liver stiffness measurements (LSM) and biomarkers [FibroTest(R) (FT)], are widely used in countries where they are available. The aim was to identify factors associated with LSM accuracy using FT as a non-invasive endpoint and vice versa. METHODS: The proof of concept was taken using the manufacturers recommendations for excluding patients at high risk of false negative/positive. The hypothesis was that the concordance between LSM and FT, would be improved by excluding high-risk patients. Thereafter, the impact of potential variability factors was assessed by the same methods. Liver biopsy and independent endpoints were used to validate the results. RESULTS: Applying manufacturers recommendations in 2,004 patients increased the strength of concordance between LSM and FT (P,0.00001). Among the 1,338 patients satisfying recommendations, the methodology identified a ...
Tensile and axial fatigue tests were conducted on shallow cryogenically treated EN19 medium carbon alloy steel to investigate its mechanical behavior. The test samples were conventionally heat treated then oil quenched at room temperature. Followed by the samples were kept for shallow cryogenic trea
The increasing demands for efficiency and flexibility result in more severe operating conditions for the materials used in critical components of biomass power plants. These operating conditions involve higher temperature ranges, more pronounced environmental effects and cyclic operations. Austenitic stainless steels have shown to possess promising high temperature properties which makes them suitable as candidates for critical components in biomass power plant. However, their behaviour under such conditions is not yet fully understood. This work investigates three commercial austenitic alloys: Esshete 1250, Sanicro 25 and Sanicro 31HT. The alloys were subjected to in-phase (IP) thermomechanical fatigue (TMF) testing under strain-control in the temperature range of 100-800 °C. Both virgin and pre-aged TMF specimens were tested in order to simulate service degradation resulting from long-term usage. The results show that the pre-aged specimens suffered shorter TMF-life compared to the virgin ...
1×3.8g Syringe. ESTELITE SIGMA QUICK® is a universal, supra-nano filled restorative material utilizing 100% spherical filler technology. With a filler weight of 82% (71% volume), the spherical fillers provide a uniform diffusion of light, allowing for a more forgiving shade match, and superb blend to surrounding teeth. In addition, the spherical fillers provide low composite wear over time and are safe for opposing dentition while causing less wear on opposing teeth.. Estelite Sigma Quick® has a low 1.3% volumetric shrinkage and low shrinkage stress for decreased post-op sensitivity and resistance against marginal leakage, allowing for lasting patient comfort.. Estelite Sigma Quick® offers a 90 second working time under ambient light, and features a proprietary initiator system that allows it to polymerize quickly, with very minimal shade shift over time.. Tokuyamas spherical fillers provide exceptional polishability, and long-term polish retention. Additionally, Estelite Sigma Quick® is ...
Google started testing a Material Design makeover on YouTube earlier this year, and now its doing the same for the companys search engine on the desktop. A small set of Google users noticed their searches displaying material design touches and shared the news on Reddit and Twitter, as...
The principal objectives of the pilot plant test work are to confirm the results obtained in previous laboratory cyanide leaching tests, optimize the metallurgical processing under an environment that more closely resembles actual operations, provide design parameters for engineering, and to start training personnel in operations and metallurgical process control. Initial results from the first 30 tonnes of sample material grading 4.8 g/t Au and 212 g/t Ag indicated average overall recoveries of 93% for gold and 90% for silver after 36 hours leach time (Figure 1). The sample material analysed represents different types of vein mineralization distributed throughout the deposit. The results to date validate Balabag test materials amenability to leaching as determined from prior laboratory scale tests. Results also demonstrate the effectiveness of carbon-in-leach (CIL) over both carbon-in-pulp (CIP) and Merrill-Crowe recovery processes in processing the test material. The one metric ton per ...
Backing materials for testing[edit]. Ballistic[edit]. One of the critical requirements in soft ballistic testing is measurement ... Biomedical testing for blunt force testing, very good tissue match Pig or Sheep animal testing[50] Live tissue Various Research ... Ballistic testing has a number of sources of variability: the armor, test backing materials, bullet, casing, powder, primer and ... Armor is more easily penetrated in testing when backed by harder materials, and therefore harder materials, such as Roma clay, ...
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The laboratories are applied Mechanics Lab., Material Testing Lab., Metrology Lab., Hydraulics Machines Lab., Thermal Engg. Lab ... International journals Admission on the institute is based on Pre-Polytechnic Test conducted by Vyavshaik Parikchmandal Bhopal ...
Glazes: Materials, Mixing, Testing, Firing." » Ceramic Arts Daily - Featured Tip of the Day. Ceramic Publications Company, 5 ... The combustible material results in smoke, which stains the unglazed portions of the pottery black. The amount of oxygen that ... Next, the clay is moved from the kiln to a container, usually a trashcan, which contains combustible organic materials such as ... The familiar technique of placing the ware in a container filled with combustible material is not a traditional Raku practice. ...
"Material Testing Laboratory Iuav". EU MIES AWARD. "Locations and maps". "Iuav Profile". "Iuav Student ... The lab system offers tools and support for: mechanical and thermos-physical testing of materials and structures short and long ... LabSCo Construction Sciences Lab The Lab began testing construction materials in the late 1940s and, in 1961, became Italy's ... It is now the seat of "Archivio Progetti", ArTec Archives on Techniques and Materials for Architecture and Industrial Design, ...
... product and material testing; odour measurement equipment; and calibration and proficiency testing for other odor labs. A large ... Odournet also manufactures products for odor assessment like olfactometers and other odor testing and sampling equipment. The ... Odournet labs are also used to qualitatively and quantitatively assess odors in particular products and materials, including ... "Leading providers of olfactometers and odour testing and consultancy Ecoma, Odournet and OLFAtec join forces". Olores. 13 ...
Infrastructure / Facilities: Various labs: 1. Material Testing Lab 2. Survey Lab 3. Hydraulics Lab 4. Computer Aided Design Lab ... Material Testing Lab 4. Foundry & Forging Lab 5. Mechanical Measurements & Metallurgy Lab 6. Fluid Mechanics Lab 7. Energy ...
American Society Testing Materials. Gregory, Justin H.; Dukes, Michael D.; Miller, Grady L.; Jones, Pierce H. (2005-05-01). " ... 825-843 ASTM (2003). "D3385-03 Standard test method for infiltration rate of soils in field using double-ring infiltrometer.". ...
... certification is carried out in four areas; Design, Material, Fabrication, & Testing. The exact procedures are ... All work done and all materials used on those systems are tightly controlled to ensure the material used in their assembly as ... On 10 April 1963, while on a deep test dive about 200 miles off the northeast coast of the United States, USS Thresher (SSN-593 ... The main ballast tank blow system failed to operate properly at test depth. Various restrictions in the air system coupled with ...
The American Society for Testing and Materials has set standards in order to judge the quality of a given fuel sample.[57] ... "American Society for Testing and Materials". ASTM International. Retrieved 2011-02-13.. ... train during summerlong test". Seattle Times. Retrieved 2009-03-01.. *^ "Disneyland trains running on biodiesel -". www ... a b Fazal, M. A.; Haseeb, A. S. M.A.; Masiuki, H. H. Biodiesel feasibility study: An evaluation of material compatibility; ...
Annual Book of ASTM Standards: Electrical Conductors. American Society for Testing and Materials. (every year) ... low-conductivity material. poor conductor. low-loss medium. good dielectric ≈ 1. lossy conducting material. lossy propagation ... Conductor materials[edit]. Main article: Electrical resistivity and conductivity § Resistivity of various materials ... The resistance of a given conductor depends on the material it is made of, and on its dimensions. For a given material, the ...
... o American Society for Testing and Materials. (1995). ASTM standardization news (Vol. 23, 1-7). American Society for Testing ... and OSHA maintains a list of approved testing laboratories, which are known as Nationally Recognized Testing Laboratories. [ ... Companies have to work with UL because they need testing to be able to sell in US. They are locked in and have few other chices ... Testing Section going "For profit"[edit]. Hi guys, I'm new to editing Wikipedia. ...
for Testing and Materials (1986). A. Casel and H. Jorke, Appl. Phys. Lett., 50, 989 (1987) R. Holm, Electric Contacts, Almquist ...
For a 3-point test of a rectangular beam behaving as an isotropic linear material, where w and h are the width and height of ... Composite Materials: Testing and Design (Fifth Conference), ASTM International: 228-228-35, doi:10.1520/STP36912S, ISBN 978-0- ... Composite Materials: Testing and Design (Fifth Conference), ASTM International: 228-228-35, doi:10.1520/STP36912S, ISBN 978-0- ... 8031-4495-8 Tsai, S. W. (December 1979). Composite Materials, Testing and Design. ASTM. p. 247. ISBN 9780803103078. v t e. ...
He was a member of the American Society for Testing Materials. In 1926, he was granted a U.S. patent for packaging of his gutta ... American Society for Testing Materials. 1915. "Adelphoi Lodge No. 33" (PDF).. ...
... geotechnical engineers employ construction-materials engineering and testing (CoMET) to observe subsurface materials as they ... Construction-materials engineering and testing (CoMET) comprises an array of licensed-engineer-directed professional services ... construction-materials engineering and testing; and other geoprofessional services. Each discipline involves specialties, many ... to encompass observation and testing of numerous additional materials (e.g., reinforced concrete, structural steel, masonry, ...
Laboratory Facilities: Material Testing Lab. Fluid Mechanics Lab. Environmental Lab. Photogrammetry and Remote Sensing Lab. ...
American Society for Testing & Materials. p. 314. ISBN 978-0803105898. Retrieved February 19, 2013. "XP/S-MP 150". TOP500. ... building upon the materials research that began in the nuclear reactors of the 1950s. In 1987 the High Temperature Materials ... detection methods for stolen or missing nuclear material and trade of nuclear material between the US and Russia. The GS&N's ... materials chemistry including synthesis and characterization of polymers and other soft materials; chemical biosciences; and ...
American Society for Testing & Materials. 'Colour Degradation In A Terra Cotta Glaze' H.J. Lee, W.M. Carty, J.Gill. Ceram.Eng. ... In addition to being a material, "terracotta" also refers to items made out of this material. In archaeology and art history, " ... using materials such as alabaster or granite, and employing sand to shape and polish. Artisans used the veins in the material ... Porcelain is a ceramic material made by heating materials, generally including kaolin, in a kiln to temperatures between 1,200 ...
"ASTM D1835 - 11 Standard Specification for Liquefied Petroleum (LP) Gases". American Society for Testing & Materials. Archived ... One particular test, conducted by a professor at the University of New South Wales, unintentionally tested the worst-case ... and the American Society of Testing and Materials. Propane/butane blends are also listed in these specifications. Propylene, ... "Liquefied Petroleum Gas Specifications and Test Methods". Gas Processors Association. Archived from the original on 21 June ...
Karthik, V. Verfasser (2016-09-15). Miniaturized testing of engineering materials. ISBN 978-1-4822-6392-3. OCLC 1076001627. ... The strength of materials is the ability to resist an applied load so that failure will not occur. The intrinsic properties of ... The heterogeneity of rock makes the microcracking behavior much more complicated than other simple materials. Factors ... Testing and Monitoring: 2007-2014, Springer International Publishing, pp. 205-220, doi:10.1007/978-3-319-07713-0_16, ISBN ...
Mechanical Testing of Materials Structures and Components; and Thermal Testing of Materials. Michael D. Johns is the vice ... They offer studies including both in vitro and in vivo testing of small molecule compounds, vaccines, biologics, and other test ... Current areas include: Non destructive evaluation of materials; Chemistry and Physics of Materials; Electrical, EO/IR, and ... Robert Piper at Southern Research synthesized the key starting material (a bromomethyl compound) which was used to prepare the ...
"DTDHandbook , Damage Tolerance Testing , Material Tests , Fracture Toughness Testing Methods , R-Curve". Retrieved ... Materials with rising R-curves can also more easily exhibit stable crack growth than materials with flat R-curves, even if G {\ ... and thus would require large testing specimen geometries (and thus high applied forces) to observe. As such, most materials ... the test specimens must be of sufficient size to remain predominantly elastic throughout the test. The size requirement is to ...
The English Vocabulary Profile is a reference source for teachers, materials writers, test developers and anyone involved in ... English Profile provides information for: • Curriculum planners • Teachers • Materials writers • Test developers • Researchers ... They have also referred to the Vocabulary Lists for the Key English Test (KET) and Preliminary English Test (PET) examinations ... Hindmarsh, R. (1980). Cambridge English Lexicon: a graded word list for materials writers and course-designers. Cambridge: ...
Ultrasonic Testing of Materials. Springer. pp. 119-149. ISBN 978-3-662-10680-8. Manbachi, A. & Cobbold, R.S.C. (2011). " ... Japanese efforts in materials research created piezoceramic materials competitive to the United States materials but free of ... A polymer does not have to be piezo-active to be an effective material for a polymer composite. In this case, a material could ... New materials were the first to be developed-quartz crystals were the first commercially exploited piezoelectric material, but ...
Calibration, quality control, and proficiency testing materials. *Test system troubleshooting and equipment maintenance ... CLIA-waived tests[edit]. Under CLIA, tests and test systems that meet risk, error, and complexity requirements are issued a ... reliability and timeliness of test results regardless of where the test was performed. Most Laboratory Developed Tests have ... although many waived tests are not done according to designed protocols - more than 50% of such tests are done incorrectly - ...
... :The Concept Paper of the CCR (Report). American Society for Testing and Materials. 2013. Trotter, ...
"ASTM International Standards". American Society for Testing and Materials. BP information v t e. ... hence the automobile club suggest the creation of a new test standard. The ASTM no. for the test method to define cold filter ... The tests according to EN 590 show that a CloudPoint of +1 °C can have a CFPP −10 °C. Current additives allow a CFPP of −20 °C ... This test gives an estimate for the lowest temperature that a fuel will give trouble free flow in certain fuel systems. This is ...
American Society for Testing and Materials. "EN ISO 12241 calculation standard". International Organisation for Standardisation ... materials that have greater than 90% closed cell content are considered to be closed cell materials. Silica Aerogel insulation ... Glass, plastics, and rubber may comprise the base material and a variety of foaming agents are used. Cellular insulations are ... Many of these factors are listed in the international standard EN ISO 23993.[citation needed] Pipe insulation materials come in ...
... to material selection and the final PPAP, for an optimized time to market. ... Automotive Materials Testing. Supporting you along the entire product development and automotive supply chain for an optimized ... Receiving independent and reliable test results: We verify material and product performance of various automotive components ... test specimen production via injection molding, as well as testing and certification of thermoplastics, thermosets, elastomers ...
... certification about the standards and properties of your plastic materials through a series of evaluations and analytical tests ... This test is the glow-wire ignitability test and is described in UL 746A and UL 746C, the Standard for Polymeric Materials, Use ... A material considered suitable for outdoor use has gone through testing in accordance with UL 746C, Polymeric Materials, Use in ... Plastic Materials Testing. Third-party certification of your plastic materials performance, especially as it relates to ...
... and share materials on HIV testing that include HIV testing 101, Understanding your HIV test results and what they mean to you ... and HIV testing. Information on other HIV testing topics. ... HIV Self-Testing (Home Testing). *Understanding a Negative ... Info Sheet: HIV Testing 101. This info sheet provides basic information about HIV testing, where to get tested, and how to ... Pocket Guide: HIV Testing. This pocket guide provides information about HIV testing, including how to find an HIV test and what ...
Materials testing - Measures of ductility: Ductility is the capacity of a material to deform permanently in response to stress ... When a material specimen is stressed, it deforms elastically (i.e., recoverably) at first; thereafter, deformation becomes ... Brittle materials, such as glass, cannot accommodate concentrations of stress because they lack ductility; they, therefore, ... Brinell test) or a steel or diamond cone (Rockwell test) into the surface of the test piece. Most hardness tests are performed ...
The microprocessor based integrated system provides test control, events sequencing, data acquisition, data red ... Laboratory testing of clutch friction materials simulates field conditions by the assimilation of microprocessor, solid state ... Microprocessor Based Testing of Friction Materials 821025. Laboratory testing of clutch friction materials simulates field ... The microprocessor based testing system described in this paper is used to quality audit and develop clutch friction materials ...
... is treated in this book from the physical fundamentals of ultrasonics and materials up to the most sophisticated methods. The ... Nondestructive testing of solid material using ultrasonic waves, for defects such as cavities, nonbonding, and strength ... Nondestructive testing of solid material using ultrasonic waves, for defects such as cavities, nonbonding, and strength ... The third part of the book presents test problems related to special materials or ranges of modern heavy industry, including ...
What salary does a Materials Testing Technician earn in your area? ... 52 Materials Testing Technician Salaries provided anonymously by employees. ... Materials Testing Technician Salaries. Job Title. Salary. TTL Materials Testing Technician salaries - 2 salaries reported. $16/ ... Cve Materials Test Engineer salaries - 2 salaries reported. $71,050/. yr. Allegheny Technologies (ATI) Test Material Processor ...
Develop & Test Materialsplus icon *Guidance & Toolsplus icon *Plain Language Materials & Resources ... the tools and resources on Visual Communication and Testing Messages and Materials to ensure your health information is ... Identify the most important factors that increase clarity and aid understanding of public messages and materials. ...
... and the selection of compatible materials allow industrial ... Moving beyond non-metallic materials testing, we can provide your business with a full suite of related materials testing and ... Performing non-metallic materials testing to explore the compatibility and durability of materials becomes a necessity where ... Choosing us to deliver your non-metallic materials testing will give you the confidence that your equipment has been optimised ...
The Critical Raw Material (CRM) Closed Loop Recovery Project aims to increase the recovery of target CRMs by 5% by 2020 and by ... Critical Raw Materials - Testing separation techniques to recover value from circuit boards * 1. The LIFE 2014 CRM Recovery ... Critical Raw Materials - Testing separation techniques to recover value from circuit boards ... Critical Raw Materials - Testing separation techniques to recover value from circuit boards ...
Non-Destructive Testing (NDT) / Materials Testing FLIR cameras with Lock-In, Transient, and Pulse capability can perform ... It is also a great tool for thermal mapping of stress when performing materials testing. ... Thermal non-destructive testing can detect internal defects through target excitation and the observation of thermal ... NDT is widely used to evaluate the properties of a material, component, or system without causing damage. IR cameras can detect ...
Usability Testing Materials "When conducting usability testing, the pressing need to meet technology requirements can mean that ... The following is a list of materials that we regard as a minimum when running a test. Links to samples (in PDF format) are ... "When conducting usability testing, the pressing need to meet technology requirements can mean that insufficient time is given ... to ensuring that other supporting materials have been prepared. The result can be a test in which the administrator feels ...
... 5-7 September 2017, The International Centre, Telford, UK Materials Testing - the most comprehensive ... Materials Testing 2017 is free of charge for visitors, who will benefit not only from a concentration of materials testing ... exhibition in the world of testing for quality, non-destructive testing (NDT), materials testing, condition monitoring and ... Materials Testing Exhibition, Tea and Coffee 10h50-11h10. Heading out on the open road with industrial radiography sources. L ...
... The dated layout could soon change. ... The new feature is obviously meant for internal testing, so theres no way of telling when, or even if, Google will launch the ... Commenters on Reddits YouTube forum discovered a new Material look that would bring it in line with the latest version of ...
Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a ... The E-values obtained in a previous MP-paper by the author published in Materials Testing 11-12/2004, using the relative method ... In a few samples, failure took place during three-point bending tests. Cracks which formed as a result of bend testing were ... An automated method for corrosion testing of coating systems on magnesium alloys Carsten Blawert, Wolfgang Dietzel, Volker ...
Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a ... The strength of the joint was tested by lap-shear tests. The result of all observations indicated a homogenous graphite ... also if different stiffnesses of the testing equipment are present. This leads especially for strain rate sensitive materials ... EN ISO 6892-1:2009 Tensile Testing: Initial Experience from the Practical Implementation of the New Standard* Johannes Aegerter ...
Thermoplastic Materials and Testing. Thursday, August 02, 2018 - Friday, August 03, 2018 02:00 am - 02:00 am ...
As a major supplier of polyester resins and synthetic materials for the thermoset composites industry, Reichhold Inc. (Research ... MATERIALS TEST & ANALYSIS SPECIAL REPORT: Making Hardness Tests a Moving Experience. Market Analysis: Material Testing ... Once the test sequence is started, no operator involvement is required. * The automated materials testing system allows ... As the testing service took off, Reichhold began to reevaluate its approach to testing. "We considered changes in the testing ...
Dynamic strength test. *Non-destructive materials testing (ultrasonic measurement, dye penetration and magnetic powder method) ... Universal test machines testing forces: 50 - 1,000 kN. Torsion test machine Mt(max): 1.6 kNm ... LABORATORIES MATERIALS ENGINEERING 1. 1.) Material characterisation. 2.) Material behaviour. 3.) Experimental determination of ... Materials Testing Laboratory (LWF). Tasks Mitarbeiter Equipment Teaching and laboratory exercises Research and knowledge ...
An Israeli TV reporter testing stab-proof material for a story about the innovation was accidentally stabbed when the material ...
Hinder testing new material on tour. 5:00 AM PDT 8/23/2007 by Gary Graff, Billboard , AP * FACEBOOK ... DETROIT -- Oklahoma rockers Hinder are devoting part of their sets on this summers Bad Boys of Rock tour testing new material ... We have a little rehearsal studio we set up (backstage) every day, and were working on new material. Its all coming along ...
... tested on a ZF-test rig. The rolling contact fatigue endurance limit of the Astaloy Mo-based material is approximately 1500 MPa ... tested on a ZF-test rig. The rolling contact fatigue endurance limit of the Astaloy Mo based material is approximately 1500 MPa ... Rolling Contact Fatigue Tests of Selectively Densified Materials 2001-01-3285. Selectively densified rollers from Distaloy DC-1 ... The case depth seems to be low for all materials, but the effect appears to be more severe for the Distaloy DC1 material. ...
The agency put it under extreme loads of almost 900,000 pounds to determine just how tough the material is. In order to get ... NASA has subjected an 8.4-foot-tall barrel made of composite materials to a series of abuse for the sake of building lighter ... detailed data of the seven tests they performed, the scientists outfitted it with thousands of sensors and had high-speed and ... NASA tests composite material for lightweight rockets. The scientists broke an eight-foot-tall barrel with a 900,000-pound-load ...
... cutting tool manufacturers are being challenged to continually evolve and develop solutions for these versatile materials. ... With advances in material sciences and the ability to design composite parts with new virtual software technology, ... There is no delamination or uncut fibers in almost every material we have tested in our machining lab. " ... Select the tool geometry based on the last material in the stack. If the last material is a plastic, use a tapered drill with a ...
Prior to testing in their Tech Center, Ingersoll felt optimistic based on a field test where their Evo-Tec shell mill was being ... At this early stage, the tests are limited to functionality and edge-life tests applying our latest products for profiling, ... composite metal and CFRP materials. Kennametals diamond-tipped SPF drills are recommended for drilling pure CFRP materials in ... "We tested two designs in the hardened Ti and had eliminated the random edge breakage, but we were not satisfied with the rate ...
Infrastructure is seeking an experienced Construction Materials Test... ... Manager of Construction Materials Testing (CMT) 24 March, 2021 Wood Environment & ... Manager of Construction Materials Testing (CMT). Wood Featured Employer Charlotte, North Carolina, United States ... Skills: Metallurgist / Materials Engineering, Materials Management Experience: 15 + Years Education: Masters Degree Location: ...
... Chemical analyses of substances in packaging and packaging materials. ... Intertek labs test all components used in packaging and packaging materials, including paper, foams, films, polymers of all ... Intertek chemical testing laboratories analyse packaging and packaging materials for product optimization, toxic analyses, ... Testing. Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.. ...
SGS professionals are providing essential materials testing by verifying material characteristics for application trials, ... will test the materials in the field conducting compaction density testing with a nuclear method to compare with lab test ... SGS Material Testing Portfolio in Full Swing in Alberta. SGS inspectors are offering project partners in Alberta a ... SGS inspectors are performing all civil construction materials testing for soils, aggregates and concrete being used to ...
  • From our dedicated Total Quality Assurance laboratories, we can conduct testing on glass-reinforced epoxy liner systems for downhole tubing. (
  • As the world's leading testing company, we offer you the latest material testing methods, highly experienced specialists, state-of-the-art laboratories and a global reach. (
  • Intertek chemical testing laboratories analyse packaging and packaging materials for product optimization, toxic analyses, problem solving, contamination, regulatory and food safety issues. (
  • SGS inspectors are conducting early construction sample collection of soils and aggregates, testing these samples at laboratories in Edmonton and Calgary to ensure that appropriate materials are on-site and determining the technical properties of the soil. (
  • The Greeley office has provided environmental, geotechnical, and materials services since 1983, when it was a part of Empire Laboratories, Inc., Acquired by Terracon in 1992, the Greeley office serves Northeastern Colorado. (
  • It could be used in material testing laboratories, e.g. aerospace in general, chemical and oil industry. (
  • NPL's solid reference materials contain radionuclides at or near the working level for use by laboratories making measurements of radioactivity relevant to environmental monitoring and decommissioning. (
  • Our permanent laboratories provide a comprehensive range of tests on bituminous materials. (
  • A British Museum survey comparing 'Oddy testing' in number of different conservation laboratories showed that there was significant variation in the appearance of metal coupons after the test and, even when this variation is excluded, there was also significant variation in the interpretation of the result4. (
  • This final rule amends 23 standards provisions in 29 CFR 1910 requiring employers to use materials or equipment listed or approved by Underwriters Laboratories (UL) or Factory Mutual Research Corporation (FMRC), and replaces this requirement with an obligation to use equipment or materials listed or approved by a "nationally recognized testing laboratory" (NRTL). (
  • The standard at 29 CFR 1910.7 also defines NRTL and provides procedures whereby testing laboratories may obtain OSHA recognition as NRTLs. (
  • Element laboratories take great pride in offering you the services of our accredited testing facilities for your nail, staple, or fastener products. (
  • Fugro maintains industry-recognised certifications and practices for our laboratories and staff to sample, test, observe and verify construction materials and methods. (
  • Hardness tests of materials such as rubber or plastic do not have the same connotation as those performed on metals. (
  • Our materials testing services offer you comprehensive testing for metals, polymers and industrial lubricants. (
  • Fracture failure in tensile tests occurred in base metals-P22, P11, and P1. (
  • Other common examples of timeless materials include stone, heavy timber, and metals with so-called "living finishes," such as copper, brass and bronze. (
  • Founded in 1913, ASM International, formerly known as the American Society for Metals, is a professional organization for metals-centric materials scientists and engineers. (
  • The laboratory specializes in metal and polymer testing, but also analyzes powdered metals, ores, ferroalloys, composites and ceramics. (
  • Laboratory Testing Inc. is a Materials Testing Lab in the Philadelphia area with over 30 years of experience in testing, inspecting and analyzing metals, alloys, polymers, composites and ceramics. (
  • Throughout the week, hands-on activities will include electron microscopy, heat treating, tensile and impact testing of metals, and more. (
  • United States rose 3% of Export of Machines for Testing Mechanical Properties of Other Than Metals Materials in 2019, compared to a year earlier. (
  • Since 2014 China Export of Machines for Testing Mechanical Properties of Other Than Metals Materials grew 10.5% year on year close to $59,961,554.52. (
  • In 2018 Seychelles was ranked number 75 in Export of Machines for Testing Mechanical Properties of Other Than Metals Materials close to $52,896.65, moving from 123 in 2017. (
  • This is a mature market and material test equipment finds use in verticals such as automotive, aerospace, metals and plastics. (
  • Recent projects of the clay material testing laboratory include the characterization of mine rock piles and soils contaminated by heavy metals. (
  • Results from a previous laboratory study showed that many commonly used roofing materials are potential contributors of metals and organic compounds to stormwater. (
  • Toughness is a desirable material property in that it permits a component to deform plastically, rather than crack and perhaps fracture. (
  • This method, says Yordy, eliminated the random edge chipping and fracture that we were recording when a plunge cutter and shell mill were tested in deeper features. (
  • Especially when exiting the material in the deeper features with the shell mill, the relatively large decrease in torsion and compression would take the cutter out-of-load, bite the material and fracture the cutting edge," Yordy says. (
  • Chemistry, Fracture Mechanics, and Metallurgical, Mechanical and Nondestructive Testing are performed at LTI with documented test results provided in Certified Reports. (
  • This method, which is based on experience developed testing steels, provides further information (in addition to the absorbed energy) on the fracture behavior of the tested materials. (
  • Therefore,the study of the dynamic behaviour of the material is necessary to quantify the dynamic mechanical properties of the material interms of both mechanical response and fracture behaviour: dynamic fracture energy and tensile strength. (
  • DOWLING, Norman E. Mechanical Behavior of Materials: Engineering Methods for Deformation, Fracture, and Fatigue. (
  • 7. Fracture toughness test. (
  • The robot moves the specimens from storage magazines or racks through an automatic identification and dimension measurement sequence and then installs the specimen in the grips of the testing instrument. (
  • At sufficiently elevated temperatures, the material can separate from the wire preventing the measurement of the thermal conductivity in a highly heated material. (
  • An apparatus for testing a material (2), having a measurement unit for measuring at least one electrical parameter of the material (2) to be tested, is proposed that ensures a measuring of all relevant parameters of the material (2) under identical measurement conditions. (
  • According to the present invention, this is achieved in that an optical measurement apparatus is provided for the simultaneous measurement of at least one optical parameter of the material ( 2 ) to be tested. (
  • 4. The apparatus according to claim 1 , wherein a measurement radiation of the optical measurement apparatus is provided depending on an optical transparency of the material. (
  • 3mm CFRP is only 2-3 wavelengths thick at 2.2MHz, It can be very difficult to get an accurate measurement on materials this thin in relation to the wavelength unless you are very careful about measurement points. (
  • 5.1 Instrumented impact testing provides an independent measurement of the absorbed energy associated with fracturing CVN or MCVN specimens for test machines equipped with a dial or optical encoder, or both. (
  • Minimum requirements are given for measurement and recording equipment such that similar sensitivity and comparable absorbed energy measurements to those obtained in Test Methods E23 and E2248 are achieved. (
  • Designers asked materials engineers to devise quantitative tests capable of measuring the propensity of a material to propagate a crack . (
  • The American Society for Testing and Materials was established in 1898 by engineers and scientists who sought solutions for breaks in rail lines. (
  • Often these benefits are over-shadowed as many test engineers associate electrodynamic systems with lack of overall control, poor response to limits, and ineffective auto-tuning processes. (
  • forum177 - Professional forum and technical support for engineers for ASTM (testing materials) Code Issues. (
  • MT provides knowledgeable reliability engineers and equipment specialists to develop test methodology and to plan customer reliability and maintainability test programs. (
  • Throughout every major industry, engineers need to be assured that the materials used in manufacturing their products or equipment are up to their intended task. (
  • ENGINEERS have invented a blastproof material that could prevent the devastating effect s of terrorist attacks like the Warrington IRA bombing in 1993. (
  • We also offer a broad range of mechanical, physical, chemical and non-destructive testing methods. (
  • In all, the company performs nearly 100 different tests for a wide variety of mechanical, flexural, tensile and other properties, on everything from raw materials through final products. (
  • The focus is naturally on the investigation of materials and components for the automotive industry, the ancillary industries and mechanical engineering. (
  • To do so, it is necessary to be able to subject the test piece to mechanical stresses and to observe defect propagation, which requires the test piece to be accessible during testing. (
  • In that way the test piece can be accessible in part during the test, but the characteristics of environment are difficult to control and cannot reproduce the real conditions encountered on a mechanical part while it is in use. (
  • The described device is equipped with a drainage system and can include means for optical inspection of the test piece and also for the application of mechanical stress to the sample (traction stress in parallel direction). (
  • The laboratory offers materials testing and analysis services including mechanical, chemical, metallurgical and corrosion testing, nondestructive testing, root cause failure analysis, calibration services, dimensional inspection and test specimen machining. (
  • LTI is accredited by the PRI Nadcap program in materials and nondestructive testing and by A2LA to ISO/IEC 17025 for mechanical, metallurgical and chemical testing, dimensional inspection and calibration services. (
  • The performance of materials is analyzed before and after ageing using optical, mechanical and physicochemical techniques. (
  • For example, the disclosed instruments can measure mechanical properties of library members in rapid serial or parallel test. (
  • For example, the disclosed instruments can measure mechanical properties of library members in rapid serial or parallel test format, and can perform tests on small amounts of material, which are easily prepared or dispensed using art-disclosed liquid or solid handling techniques. (
  • Among them we emphasize the characterization, quality control, engineering, materials research and failure analysis of mechanical components in service, areas where the companies are firmly in favor of the reliability and security of equipment and facilities industrial as well as the quality of products. (
  • Materials testing is a highly precise technique that measures the characteristics of materials, such as mechanical properties, elemental composition, corrosion resistance and the effects of heat treatments. (
  • High-speed imaging is applied to materials testing in order to measure the physical and mechanical properties of different materials or components. (
  • View over mechanical, technological and non-destructive test methods for quality estimation of structural materials and structural element. (
  • Student gets the basic knowledge in the field of structural materials evaluation on the basis of mechanical and non-destructive parameters. (
  • The main goal of this course is to provide students with laboratory work concept dealing with mechanical and non-destructive testing and last but not least draw attention to relevance of these test methods in practices. (
  • Materials Testing - the most comprehensive exhibition in the world of testing for quality, non-destructive testing (NDT), materials testing, condition monitoring and diagnostic technology - 2017 showed a new range of features and industry speakers. (
  • Materials Testing 2017 took place from 5-7 September in Telford, UK and was bigger and better than ever. (
  • Materials Testing 2017 is free of charge for visitors, who will benefit not only from a concentration of materials testing innovation and excellence, but also from an enhanced programme of talks and seminars in the exhibition hall, covering practical aspects of NDT and related technologies. (
  • In late 2017 and the first half of 2018, over 400 samples were collected from a number of muckpiles on First Cobalt's patented ground to study the potential for processing lower grade material from historic mining operations. (
  • In 2017 Jamaica was ranked number 11 in Re-Export of Parts and Accessories of Material Testing Equipment to $5,385.89, compared to 19 in 2016. (
  • The Global And China Material Fatigue Testing Machine Industry 2017 Market Research Report is a professional and in-depth study on the current state of the Material Fatigue Testing Machine industry. (
  • This system combines real-time scanning electron microscope (SEM) imaging with in-situ materials tensile testing, extending simplicity and precision to small-scale materials characterization without sacrificing flexibility or control. (
  • Chemical stability during temperature changes if the product is made of rubber or elastomer materials (characterization of the infrared spectrum, thermogravimetric analysis). (
  • The Critical Raw Material (CRM) Closed Loop Recovery Project aims to increase the recovery of target CRMs by 5% by 2020 and by 20% by 2030. (
  • TESTING SEPARATION TECHNIQUES TO RECOVER VALUE FROM CIRCUIT BOARDS Outcomes of a CRM Recovery Trial in Scotland, UK The Critical Raw Material (CRM) Closed Loop Recovery Project aims to increase the recovery of target CRMs by 5% by 2020 and by 20% by 2030. (
  • With businesses impacted considerably due to supply chain disruption and reduced demand globally, 2020 witnessed a considerable decline in the demand for material test equipment products. (
  • CALGARY, AB / ACCESSWIRE / January 16, 2020 / Jade Leader Corp. (TSXV:JADE) ("Jade Leader" or "the Company") is pleased to announce an update of the photo gallery for Wyoming Project Jades on its webpage at, including stone testing results to date, including a range of stones from the last trenching and mapping program conducted in September/October of 2019. (
  • The present work introduces an automated corrosion test for coating systems on magnesium alloys, which is based on the titration method introduced by General Motors [1], in which the dissolution rate of magnesium is determined from the amount of HCl added to a sodium chloride solution required to maintain a constant pH value. (
  • Macroscopic investigations related to the geometrical shape of the closed end allowed the optimization of the welding process and the structural investigations made by optical microscopy and X-rays diffraction evinced the structural transformations of the material, supplying information for the post welding heat treatment to increase the corrosion resistance characteristics of the covering. (
  • Even if it was developed within the space field material testing applications, this method and apparatus may be applied more generally to materials and chemistry corrosion testing of materials. (
  • Simple corrosiveness tests are accelerated ageing tests of the type widely described in corrosion literature since the mid 1960's 1 and now refined in British Standard BS903 (1987) 2 . (
  • Possible hazards are then indicated by the severity of corrosion on the test coupons. (
  • Corrosion Testing of Salt Spray. (
  • Testing of susceptibility to intergranular corrosion (ASTM A 262). (
  • These classifications, listed in descending order for each of the following three groupings, are used to distinguish a material's burning characteristics after test specimens have been exposed to a specified test flame under controlled laboratory conditions. (
  • Specimens molded from the plastic material are oriented in either a horizontal or vertical position depending on the specifications of the relevant test method. (
  • Indeed, according to Bruno Belanger, Reichhold's physical testing manager, the number of specimens tested by the company has nearly doubled within the last two years. (
  • Measurements were made at different specimens with contact coupling transducers in pulse-echo testing method. (
  • A green ceramic step bar and a cylindrical ring with different blind holes were test specimens. (
  • For stability, specimens must be tuned in the high-stiffness region but that tuning traditionally results in low performance when the specimen reaches the low-stiffness region during the test. (
  • As a result, they were unable to reliably tune and test anything but specimens with very limited variation. (
  • The in-house Machine Shop prepares all test specimens and failure analysis services are offered. (
  • The textures of Jades tested to date have ranged from medium to very fine grained material, outlining potential uses for those materials ranging from carving, ornamental use and fine jewelry, as well as collector's specimens. (
  • With our service portfolio you have access to a single source for compounding trials, test specimen production via injection molding, as well as testing and certification of thermoplastics, thermosets, elastomers and composites. (
  • In the Izod test , the specimen stands erect, like a fence post. (
  • Shape and size of the specimen, mode of support, notch shape and geometry, and velocities at impact are all varied to produce specific test conditions. (
  • With digital recording and a transmitting voltage of about 800 V a measuring uncertainty of the ultrasonic transfer time of 0,42 µs was obtainable for a green state SSiC-specimen with a minimal thickness of 40 mm and a test frequency of 600 kHz. (
  • A number of local businesses will be displaying their products and services, including the materials testing, nondestructive testing, specimen machining and calibration services offer by LTI. (
  • Specimen stiffness can change over the course of dynamic tests which presents a performance challenge for most systems. (
  • In biomedical testing, the complex specimen structure and geometry makes traditional limits inadequate for specimen protection. (
  • Where the specimen and test conditions make specimen protection a challenge, the MTS Acumen system excels. (
  • We opened the MTS TestSuite interface and showed the customer how the auto-tuning process incorporates specimen-specific measurements as part of the setup process, facilitating greater accuracy and customization for a specific test. (
  • Whether you need to verify material characteristics for application trials, detect defects, analyze failures, improve new materials or conduct basic research on the theoretical strength of materials, effective materials testing is essential. (
  • SGS professionals are providing essential materials testing by verifying material characteristics for application trials, detecting defects, analyzing failures, improving new materials and conducting basic research on the theoretical strength of materials. (
  • Effective materials testing covers verification of material characteristics for application trials, detection of defects, analysis of failures, improvement of new materials or conducting basic research on the theoretical strength of materials. (
  • Based on the idea that a material's response to a load placed at one small point is related to its ability to deform permanently (yield), the hardness test is performed by pressing a hardened steel ball ( Brinell test ) or a steel or diamond cone ( Rockwell test ) into the surface of the test piece. (
  • Having been cured correctly, concrete cylinders will be tested at the labs for compressive strength to guarantee the concrete strong enough. (
  • Q: Based on your recent experience demonstrating MTS Acumen test systems, what is the appeal of electrodynamic actuation in test labs and what are some of the challenges? (
  • Electrodynamic technology, which provides the user with higher performance capability than servohydraulic technology, can be quickly and easily integrated into test labs because it can be installed and used in any location with a conventional electrical outlet, consumes less energy than other technologies, and systems require minimal maintenance. (
  • Following the successful demonstration of this method at NIST, two large U.S. testing labs have worked with NIST to develop their own in-house slug calorimeters as a testing service to their clients, and a third U.S. company recently introduced a commercial version of a slug calorimeter. (
  • Materials Testing Labs and Materials research. (
  • There's actually all kinds of things to test for and formal ways to test them (there are labs that just test textiles). (
  • Receiving independent and reliable test results: We verify material and product performance of various automotive components made of plastics according to international standards - ISO, ASTM, VDA, UL, etc. - as well as client's delivery specifications. (
  • ASTM International (formerly the American Society for Testing and Materials) has published a standard (ASTM E 2584) detailing how to conduct thermal conductivity measurements with the new method. (
  • and ASTM Standard E 2584-07, "Standard Practice for Thermal Conductivity of Materials. (
  • Abstract The American Society of Testing and Materials (ASTM) subcommittee on skimmers recently adopted a standard methodology for measuring the nameplate capacity for a given skimmer system. (
  • ASTM D 4644-87 (Reapproved 1992) Standard Test Method for Slake Durability of Shales and Similar Weak Rocks. (
  • There are 12 UL 94 specified flame classifications assigned to materials based on the results of these small-scale flame tests. (
  • This leads especially for strain rate sensitive materials to better comparable results. (
  • In this paper it is documented the need for the implementation of method A, methods for the realisation - also by the use of older testing systems - and an example of the comparability of results of the methods for a strain-rate-sensitive-steel. (
  • The universal testing machine performs the required tests, collects and analyzes data and prepares a report of test results. (
  • Automating the testing process affords technicians the time to do more applications-oriented work, such as critical analysis and interpretation of test results, he adds. (
  • Test results serve as a great source of information. (
  • When construction begins, SGS experts will test the materials in the field conducting compaction density testing with a nuclear method to compare with lab test results. (
  • The article discusses how advances in construction materials engineering testing and using advanced collaboration methods, can help achieve better results. (
  • All test and inspection results are provided in certified reports. (
  • Most industrial and natural materials exhibit a macroscopic behaviour which results from the existence of microscale inhomogeneities. (
  • But historically, most have reported only visual inspections as test results. (
  • However, the interpretation of the results still remains very subjective and the most difficult part of the test. (
  • This difficulty becomes even more serious when considering the implication of test results for nonmetallic artefacts. (
  • Results show that acceptable CLSM material can be developed by blending the fluidized bed boiler ash with the stoker boiler ash. (
  • Recommendations for a pilot scale manufacturing application of the three CLSM mixtures were made based upon the lab test results. (
  • The results of these tests aid in determining the value of clay materials to the public and industry, and their importance in scientific research. (
  • Although the clay materials laboratory cannot accept outside samples on a regular basis, contract testing is possible on a limited number of projects in New Mexico in which test results would benefit both the public and the Bureau. (
  • The NAG test provides a direct assessment of the potential for a material to produce acid after a period of exposure and weathering and is used to refine the results of the theoretical acid-base accounting (ABA) predictions. (
  • The instrumented data may also be used to highlight test results which should be discarded on the basis of misalignment or other critical test factors. (
  • Practice and coaching on the materials will invalidate the results. (
  • He or she is responsible for planning, coordinating, executing and reporting test results and associated data analysis. (
  • Upon completion of the test program, results are assembled to quantify the system's performance. (
  • Test results evaluation. (
  • Other materials are sometimes added to the mixture, including fibres, polymers and pigments to produce specific performance characteristics. (
  • Most testing is performed on metallic materials, composites, ceramics and polymers. (
  • If the material is ductile, this local deformation is permanent, and the test piece does not assume its former shape if the stress is removed. (
  • Penetration is measured, of course, but deformation caused by testing such materials may be entirely temporary. (
  • Performing non-metallic materials testing to explore the compatibility and durability of materials becomes a necessity where equipment is required to operate in rigorous environments. (
  • Choosing us to deliver your non-metallic materials testing will give you the confidence that your equipment has been optimised for maximum durability and longevity. (
  • One of the challenges is that there hasn't really been a standard test for durability, said Turner. (
  • Eastman advises that medical device designers and other stakeholders measure impact resistance and durability of device materials after exposure to disinfectants. (
  • The slake durability tests are conducted to estimate the durability and strength of rock samples. (
  • Resistance testing of the durability. (
  • With so many resources at our fingertips, additional electrical characteristics and analytical tests can be easily be performed at your request. (
  • Employing these tools in conjunction with broad-based expertise in analytical sciences, we are able to tailor laboratory proficiency testing programs and reference materials to meet complex client needs across industries. (
  • Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others. (
  • Our testing program does just that by evaluating and analyzing the standards and properties of your plastic materials. (
  • NDT is widely used to evaluate the properties of a material, component, or system without causing damage. (
  • In order to close one of the microprobe ends covering, considering geometrical sizes and the properties of the material, the electro riveting process by TIG welding was chosen. (
  • Environmental testing of materials involves exposing a test piece of a material to a specific environment (chemical, thermal, etc.) in order to reveal any adverse effects on its properties. (
  • One of the properties of the material that needs to be analyzed is its ability to withstand propagation of an existing defect, e.g. a surface crack. (
  • Most test machines for measuring material properties, such as wear resistance or fatigue, only have one direction of motion. (
  • The non-destructive characterisation methods, especially the ultrasonic testing, to measure fast and with low costs thee inhomogeniousities and different material properties, are very interesting. (
  • It is invaluable to know the intrinsic thermal properties of envelope materials and components, as well as partition walls, to optimize building insulation . (
  • Chemical properties and water leaching tests were also performed on the hardened CLSM. (
  • In creating computer simulations to study the collapses of the World Trade Center buildings on Sept. 11, 2001, NIST researchers needed to know important properties of the fireproofing materials that protected structural steel columns. (
  • Thinning a material down to a single-atom thickness can dramatically change that material's physical properties. (
  • The Hemicellulose research group have chosen the Systech Illinois 8001 oxygen permeation analyser to test the barrier properties of polysaccharide films. (
  • In a new live presentation, METTLER TOLEDO experts will review the benefits of various thermal analysis methods commonly used to test the properties, characteristics, and safety of potentially lifesaving new materials. (
  • The NMBGMR has facilities to characterize the mineralogy and ceramic properties of clay materials. (
  • It provides guidelines and material properties for polymer (organic), metal, and ceramic matrix composite materials. (
  • Physical properties testing products range from force and torque instruments, to hardness and thickness gauges, to viscometers and spectrometers. (
  • In a few samples, failure took place during three-point bending tests. (
  • We can supply both real samples and artificially spiked reference materials that reflect samples which are taken from both the environment and nuclear sites. (
  • Six Down Beam Holes provided space for additional removable material samples to be placed near the core. (
  • In tandem with the sampling program, three one-tonne samples were collected to test ore sorting technology with the intent of increasing the head grade of feed material. (
  • During the test, plastic samples are secured on a fixed-strain jig, exposed to a disinfectant, and then placed in a bag for at least 24 hours. (
  • After exposure, the samples are then subjected to a fourth step, a reverse-side impact test. (
  • Samples of test material are placed in a sealed environment at elevated temperature and humidity together with metal test coupons as indicators. (
  • Compared to conventional instruments, the disclosed instruments afford faster sample loading and unloading, for example, through the use of disposable libraries of material samples. (
  • Lirin, although 400m/s seems to be a rather high difference if the samples were tested in the same orientations, indeed some materials can be dispersive. (
  • Proficiency testing samples are presented as single blind. (
  • Flames creep along the cedar siding on a test house hit by blown embers at a research facility run by the Insurance Institute for Business & Home Safety. (
  • 11. Creep tests. (
  • For assistance, Reichhold turned to Instron Corp. (Canton, MA), a provider of materials testing equipment. (
  • The know-how of the professors and the testing equipment are available to all interested companies, however. (
  • Does your organisation require access to a range of specialist equipment and a professional testing service to carry out profitable research and development? (
  • LTI Metrology, a division of Laboratory Testing Inc., provides dimensional inspection services and NIST-traceable calibration services for measuring hand tools, masters and a wide-range of measuring instruments and equipment. (
  • This visibility and responsiveness will keep your test equipment at peak capacity more of the time, helping you meet more aggressive deadlines and keep projects on schedule. (
  • Dublin, May 12, 2021 (GLOBE NEWSWIRE) -- The "Global Material Test Equipment Market 2021 - Emphasis on Zero-defect Manufacturing Powering Demand" report has been added to's offering. (
  • This research analyzes the global trends in the material test equipment market across different industries. (
  • The demand for high-quality products that meet international standards will continue to drive demand for testing equipment globally. (
  • The report discusses the various trends, drivers, and restraints that are impacting the material test equipment market across the different industries, and the business impact of these drivers and restraints on the enterprises, service providers, and small and medium businesses. (
  • Buehler is a premier manufacturer of scientific equipment and supplies for use in materials analysis with offices in nine countries, sales distribution in over 100 countries, and over 45 Buehler Solutions Centers. (
  • I assume, that in your case the material is relatively strongly attenuating, but without experience with your case and equipment I am not able to tell more. (
  • OSHA Instruction STP 2-1.147, July 13, 1988, Safety Testing or Certification of Certain Workplace Equipment and Materials, is canceled. (
  • i.e., where workplace equipment and materials require safety certification or testing, the testing laboratory must have received Federal OSHA recognition as an NRTL for that equipment or material. (
  • laboratory accreditation program for different State equipment and materials requirements with in-State applicability and enforcement, the State must adopt a standard at least as effective as the Federal 1910.7. (
  • In 2019, Re-Export of Parts and Accessories of Material Testing Equipment from Saudi Arabia increased 22.4% compared to the previous year. (
  • Since 2014 United States Re-Export of Parts and Accessories of Material Testing Equipment jumped by 7.5% year on year to $10,999,408.52. (
  • In 2019 United Arab Emirates was ranked number 2 in Re-Export of Parts and Accessories of Material Testing Equipment. (
  • Upstream raw materials, equipment and downstream consumers analysis is also carried out. (
  • Advanced Test Equipment Corp. (
  • The Materiel Test Directorate (MT) provides evaluation of systems, materiel and equipment through field, and laboratory testing on WSMR for sponsored DoD, foreign, space and industry customers. (
  • Meeting the specifications put out by testing equipment manufacturers is critical when conducting quality control testing. (
  • Nondestructive testing of solid material using ultrasonic waves, for defects such as cavities, nonbonding, and strength variations, is treated in this book from the physical fundamentals of ultrasonics and materials up to the most sophisticated methods. (
  • Moving beyond non-metallic materials testing, we can provide your business with a full suite of related materials testing and selection services across a wide range of industries and locations worldwide. (
  • Contact us today to find out more about our comprehensive range of materials testing services. (
  • As a major supplier of polyester resins and synthetic materials for the thermoset composites industry, Reichhold Inc. (Research Triangle Park, NC) provides a variety of value-added services for its customers. (
  • One of those services is testing. (
  • As a result, the company has experienced a jump in the demand for its testing services. (
  • On behalf of Siemens Power, AltaLink and ATCO Electric, Ellis Don Construction awarded SGS two contracts to provide construction materials testing services for soils, aggregates and concrete for the Alta Link WATL (Western Alberta Transmission Line) and ATCO EATL (Eastern Alberta Transmission Line) power transmission project. (
  • SGS is implementing the full range of its concrete and aggregate testing services to ensure the quality of both the concrete and aggregate being implemented at the Edmonton and Calgary sites. (
  • Information on Laboratory Testing services and accreditation's is available at, [email protected] or 800-219-9095. (
  • Many materials are downloadable, and others can be ordered from ETS Disability Services. (
  • To order materials that cannot be downloaded (such as Braille, recorded audio or hard copy large print) or if you require materials in a format not listed here, contact Disability Services Monday to Friday 8:30 a.m. to 5 p.m. (
  • The Materials Testing Laboratory offers its customers a wide range of multidisciplinary services in the field of materials science. (
  • During the construction phase of a project our construction materials engineering and testing (CMET) services provide asset verification. (
  • Toughness measures the amount of energy required to deform a piece of material permanently. (
  • The Federal Institute for Materials Research and Testing (German: Bundesanstalt für Materialforschung und -prüfung, or BAM) is a German material research institute. (
  • Bottom left: Fire engineer Daniel Gorham (far right) monitors the test from a control room at the Insurance Institute for Business & Home Safety research facility. (
  • This article outlines research of 'corrosiveness tests' as carried out at the Victoria and Albert Museum to test materials for possible interactions with museum artefacts. (
  • Our team offers technical support, method evaluation, and calibration standards for analysis, in addition to applied research in fibrous and particulate materials. (
  • Argonne chemist Kris Pupek loads a sample onto a high-performance liquid chromatography instrument in the Materials Engineering Research Facility's process research and development lab. (
  • The research team at the University of Bath is testing and comparing the thermal performance of each of the insulation materials by constructing three identical prototype wall panels, each containing one of the materials. (
  • The panels will undergo six weeks of consecutive rigorous testing in a state-of-the-art environmental chamber at the University's Building Research Park. (
  • Our previous research has shown the performance of straw bales as a sustainable and energy efficient building material, however, there are a number of other waste and co-products which could also perform well as construction materials. (
  • The following are some global organizations which are involved in setting up of "testing standards" and active research for material analysis and reliability testing. (
  • Global And China Material Fatigue Testing Machine Market Research. (
  • The DIBELS Materials are made available as a research courtesy "as is" with no representations or warranties. (
  • We carry a wide variety of materials testing and physical testing products that are ideal for quality control testing along with research applications, letting you evaluate and test materials such as plastics, coatings, and chemicals. (
  • APPLICATION PROCEDURES To qualify to receive materials described in this announcement the applicant must: (1) have peer-reviewed research indicating the need for the requested materials, and (2) submit a correctly completed application form and a signed waiver of liability. (
  • The objective of our research is to protect public places from the threat of terrorism by mitigating the effects of an explosive device using nove l composite materials. (
  • The Home Office is supporting the scientific research and Westminster Council has already expressed an interest in making street furniture for central London out of the material. (
  • His research into blast-proof materials that would limit bomb damage was inspired by the devastation caused by the IRA bombing of Manchester city centre in 1996. (
  • The University of Liverpool has a key role to play in achieving this objective with its research on blast effects and the development of new blast-resistant materials. (
  • Our evaluations include the determination of material flammability (burning characteristics), ignition characteristics from various thermal and electrical sources, and electrical tracking. (
  • It is also a great tool for thermal mapping of stress when performing materials testing. (
  • Thermal non-destructive testing can detect internal defects through target excitation and the observation of thermal differences on a target surface. (
  • The University of Bath is testing a number of waste materials to assess their thermal performance as potential materials for insulating buildings. (
  • Professor Pete Walker (left) and Dr Shawn Platt (right) from the University are Bath are testing a number of waste materials to assess their thermal performance as potential materials for insulating buildings. (
  • This is the first time these materials will have been tested in such a robust scientific way allowing us to accurately assess their thermal performance against each other as well as against industry standard insulation. (
  • The opportunity to exploit these waste and agricultural co-products is not something that should be ignored and we are hopeful that if their thermal performance is comparable or better than current insulation, industry will think seriously about using the materials in future construction. (
  • Now, researchers at the National Institute of Standards and Technology (NIST) and their colleagues have developed a technique for measuring a key thermal property of fire-resistive materials at high temperatures. (
  • One key property was the thermal conductivity of the material: How quickly does heat transfer through it? (
  • Combining this data with the known heat capacities and densities of the steel slug and the fire-resistive material, the researchers can determine the material's thermal conductivity at various temperatures. (
  • Possible applications beyond steel fireproofing material, Bentz says, involve measuring the thermal conductivity of wood-based materials, as well as the insulating materials used to protect spacecraft such as the Space Shuttle. (
  • Thermal analysis offers an accurate and cost-effective way to test materials that will be used for medical purposes. (
  • Now, a team of Penn State researchers has developed a fast, nondestructive optical method for analyzing defects in 2-D materials. (
  • By providing experienced civil construction inspectors, SGS can assure Ellis Don, to whom is reported to directly, as well as component manufacturer Siemens and project owners ATCO and AltaLink that all materials being implemented are within specification to prevent potential failures of structures. (
  • The X-Y table, pneumatic actuators, load cells, and additional motors are connected to custom software interface and can be easily adapted to reproduce biologically realistic motions for use in a wide range of fundamental, interdisciplinary questions and applications of materials and structures. (
  • Most of the approaches to the evaluation of the safety of structures according to probabilistic criteria are somewhat scattered, however, and it is time to present such material in a coherent and up-to-date form. (
  • In a high-temperature blaze, how well does a fireproofing material shield a building's important steel structures from heat? (
  • On facade materials and components, for which the laboratory analyzes solar heat gain (determination of g-value). (
  • In addition to manufacturing the resins that are used to construct composite laminates used in products ranging from boats to storage tanks to satellite dishes, Reichhold also provides materials testing for its composite fabricator customers. (
  • NASA has subjected an 8.4-foot-tall barrel made of composite materials to a series of abuse for the sake of building lighter and stronger rockets. (
  • This is only the first in a series of large-scale tests for NASA's composite material. (
  • NASA's primary goal is to determine a composite material and structural design that can be used to make rockets lighter and tougher than their metallic counterparts. (
  • With advances in material sciences and the ability to design composite parts with new virtual software technology, cutting tool manufacturers are being challenged to continually evolve and develop solutions for these versatile materials. (
  • Possible combinations and their machining characteristics, according to Kennametal's Composite Machining Guide, include fiber reinforcement materials like carbon fiber/graphite fiber, glass fibers, ceramic fibers, polymer fibers, and tungsten fibers. (
  • Three different materials are being evaluated - wheat straw bales, rapeseed stalks (processed into bio-composite), and recycled duvets. (
  • - A government publication that contains extensive information on the design, fabrication, and use of composite materials. (
  • Plastic products need to be tested to ensure that they meet a very specific set of regulatory safety and quality standards. (
  • Six of the classifications relate to materials commonly used in manufacturing enclosures, structural parts and insulators found in consumer electronic products (5VA, 5VB, V-0, V-1, V-2, HB). (
  • Validating the specifications, value and safety of your raw materials, products and assets. (
  • Methodology The IT products unsuitable for re-use, were transported to the University of the West of Scotland, to be processed for precious metal and critical raw material recovery. (
  • At this early stage, the tests are limited to functionality and edge-life tests applying our latest products for profiling, pocketing, contouring, face milling, and drilling this material. (
  • Intertek scientists and packaging experts work with clients to identify and isolate trace contamination, odours, coatings and more in package materials and final products. (
  • This collaborative project between the University of Bath, University of Brighton, UniLaSalle in Rouen (France) and five other academic and non-academic partners, and funded under the Interreg VA France (Channel) England programme, is investigating the performance of a range of waste materials and bio-based co-products as alternative building insulation materials. (
  • It is hoped that by using already existing waste materials or co-products, widespread use of such materials in the construction sector could lead to significant reductions in emissions associated with construction as well as reducing the dependency on natural resources used in traditional insulation such as glass wool and rock wool. (
  • The three materials being tested are either bio-based co-products (wheat straw and corn pith panel) or waste (duvets). (
  • The top companies offer several products in addition to offering automated testing machines. (
  • Testing for contamination and quality control is an integral part of these companies' final products. (
  • 3.- Consumer Product Testing: Analysis, monitoring and functional tests of the products to determine their compliance with technical specifications and / or regulation. (
  • On opaque and translucent materials and components (coating, closures, glazing, light transmitting sheets, etc.), for which the laboratory can characterize behavior when interacting with sources of natural and artificial radiation . (
  • Paste tests are used to evaluate the geochemical behavior of mine waste materials subject to weathering under field conditions and to estimate the pH and conductivity of the porewater resulting from dissolution of secondary mineral phases on the surfaces of oxidized rock particles. (
  • To increase quality, reduce cost and improve manufacturing processes it s vital to know the behavior of materials under different external demands: tension, compression, fatigue, stress, shear, temperature shock, etc. (
  • Materials testing from SGS - a comprehensive range of testing methods for a wide range of materials. (
  • But, once Ingersoll began general testing in the tech center with other cutter types and programming methods they began to appreciate the difficulty that roughing the harder Ti would pose, especially in deeper features. (
  • Testing methods being applied in the lab include proctor, used to determine moisture and density relationship, moisture content and particle size distribution (PSD). (
  • Field testing will include methods relevant to slump, flow and air content. (
  • SGS inspectors are offering project partners in Alberta a comprehensive range of testing methods for a wide range of materials. (
  • Prior art testing methods fall short when the previous requirements have to be combined with the necessity to expose the piece to a test environment that is corrosive, toxic, flammable, and/or likely to be contaminated in order to better mimic real world conditions. (
  • The main point of this work is the optimisation of different ultrasonic testing methods for the testing of green ceramic bodies. (
  • UT is aspect of a selection of techniques known as NDT (Non Destructive Testing) methods. (
  • Material analysis capabilities cover a broad range of techniques and instrumentation. (
  • Explosive testing capabilities include facilities for safety tests such as fire, drop, bullet impact, sympathetic detonation and others. (
  • Availability of materials are contingent on DOC/NOAA production capabilities. (
  • Reichhold's ability to run the gamut of physical property tests for its customers sets it apart from many of its competitors. (
  • Instron had already provided about a dozen machines used by Reichhold in its physical testing lab. (
  • Using Pass4sure Software Certifications online practice materials you don't have to purchase anything else or attend expensive courses. (
  • Assessment materials should not be used for student practice or coaching. (
  • The European Space Agency (ESA) is interested in licensing a method and apparatus to perform tests on materials. (
  • This innovation provides a method of testing that does not present these drawbacks, comprising of a receptacle provided with an opening with means for leak tight contact between the edges of said opening and a portion of a surface of a test piece of a material disposed outside the vessel. (
  • When compared to prior art, the described product and method are quite innovative as they allow the testing of a given sample in previously impossible conditions, such as keeping said sample accessible for stress testing while avoiding the test environment contamination or exposure to the noxious chemicals. (
  • ACS Testing provide highly skilled technicians who all hold current CSCS cards and are comprehensively trained in the safety aspects of the work they carry out in accordance with appropriate method statements and risk assessments. (
  • This test method provides a means of determining, under controlled laboratory conditions, the potential heat of building materials subjected to a defined high-temperature exposure condition. (
  • 1.1 This test method establishes the requirements for performing instrumented Charpy V-notch (CVN) and instrumented miniaturized Charpy V-notch (MCVN) impact tests on metallic materials. (
  • ISO 14556 SteelCharpy V-notch Pendulum Impact TestsInstrumented Test Method Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, (
  • Tests have shown that the decrease in material strength and elasticity is often quite abrupt at a certain temperature, which is called the transition temperature for that material. (
  • Designers always specify a material that possesses a transition temperature well below the range of heat and cold to which the structure or machine is exposed. (
  • Cathodic disbondment, chemical and seawater immersion testing and evaluations of ageing in produced fluids can be conducted under ambient or high-pressure, high-temperature conditions in our autoclave facilities. (
  • FLIR cameras with Lock-In, Transient, and Pulse capability can perform advanced inspections such as Non-Destructive Testing (NDT) or stress mapping, resolving temperature differences as low as 1 mK. (
  • Available tests for the detection of the concentration of lactate dehydrogenase in body fluids have, until now, consisted of extremely complex liquid systems whereby test tubes, measuring devices, ultraviolet light, standardization of instruments, correction factors depending upon temperature and false readings prevail. (
  • Bituminous road surfacing materials are produced by mixing mineral aggregate with a bitumen binder in predetermined quantities and within defined temperature ranges. (
  • There will be two tests - a steady state and a non-steady state temperature test. (
  • In the first test an increasing temperature will be applied to one side of the panels to calculate how much energy is required to increase the temperature on the other side of the panel. (
  • Other factors that can affect the release of pollutants from the materials, for example the outside air temperature and rain intensity, will also be studied. (
  • Reference materials are vital for accuracy in measurements relating to the decommissioning and environmental monitoring sectors. (
  • Bituminous Materials Testing by ACS Environmental Testing Ltd. (
  • ACS Environmental Testing Ltd. (
  • Non-metallic materials testing and the selection of compatible materials allow industrial components to achieve resistance to harsh operating environments. (
  • SGS soil inspectors are completing laboratory testing for particle size distribution and compressive strengths, soil index and moisture/density. (
  • The material's resistance to ignition and surface tracking characteristics is described in UL 746A, which is similar to the test procedures described in IEC 60112, 60695 and 60950. (
  • Said device can be described as a sealed container able to ensure tight contact between edges of the opening and a portion of the surface of a material being tested. (
  • In aforementioned tests it was only possible to have the test sample in a leaktight receptacle, guaranteeing the environment fidelity and safety, but making the sample inaccessible for interaction and testing during the exposure, or to carry out tests on a test piece in which a portion of its surface is exposed to a flow of testing liquid or gas. (
  • As for the opening of the chamber contacting with the surface of the test piece, it is engineered to be leak tight, providing an adequate seal. (
  • The source of the size effect may be from the amorphous zone developed on the surface of the material. (
  • Surface testing specialist Krüss Scientific Instruments has become a member of the Institute of Advanced Composites Manufacturing Innovation (IACMI). (
  • Clorox Healthcare, a provider of hospital disinfectants, has endorsed the four-step testing protocol as an "effective tool for assessing the integrity of a device or surface after repeated cleaning and disinfection," Eastman stated in a news release . (
  • In aerospace and land-based turbine applications, high temperatures demand heat resistance, which is the major strength of materials like titanium, Ti-alloys, Inconel, and nickel-based and cobalt-based superalloys. (
  • The two-year project is a collaboration with Prof Gerald Nurick at the University of Cape Town, a world expert, who will co-ordinate test explosions to assess the blast-resistance of the material. (
  • Hatfield, PA, May 28, 2016 --( )-- Laboratory Testing Inc. (LTI) is proud to sponsor the twelfth annual Materials Camp at Drexel University in Philadelphia, PA from June 20 - 24, 2016. (
  • Buehler has been a manufacturer of scientific instruments and supplies for cross-sectional material testing since more than 80 years. (
  • Buehler is a manufacturer of scientific instruments & supplies for cross-sectional material testing. (
  • Laboratory testing of clutch friction materials simulates field conditions by the assimilation of microprocessor, solid state controller, instrumentation and data acquisition technologies. (
  • HATFIELD, PA, November 07, 2015 /24-7PressRelease/ -- Laboratory Testing Inc. (LTI) will be exhibiting at the 2015 Eastern PA Materials Exposition on Thursday, November 12th, 2015. (
  • About Laboratory Testing Inc. (
  • Laboratory Testing Inc. (LTI) of Hatfield, PA is a family-owned independent testing and metrology laboratory in business since 1984. (
  • Receive press releases from Laboratory Testing Inc. (
  • Laboratory Testing Inc. is proud to sponsor the 12th annual ASM Philadelphia Materials Camp for high school students interested in exploring the field of materials science and engineering. (
  • Laboratory Testing Inc. takes a leadership role in generating interest in the materials industry with the younger generations," said Brandon McVaugh, Destructive Testing Manager. (
  • The second test will involve increasing the humidity to evaluate how each material maintains and holds moisture. (
  • To this end, the company has developed a new four-step testing protocol incorporating such evaluations and recently shared that approach at AAMI's recent conference in Austin, TX . (
  • A diagnostic test indicator for the determination of the concentration of lactate dehydrogenase in sera comprising a bibulous material which has contained therein the dried residue resulting from the impregnation thereof with 1. (
  • 1. A diagnostic test indicator for the determination of the concentration of lactate dehydrogenase in sera comprising a bibulous material which contains therein the dried residue resulting from the impregnation thereof with 2. (
  • Test strips or cards of this type have been devised for glucose determination and treponemal diseases, for example. (
  • There has therefore existed, for a substantial period of time, the need for a simple testing mechanism for the determination of the concentration of serum lactate dehydrogenase in body fluids, especially the blood, which long-felt need is satisfied by the instant invention more fully discussed hereinbelow. (
  • As mentioned briefly above, I have now discovered a novel test means for the determination of the concentration of lactate dehydrogenase in body fluids. (
  • My test means is useful for the qualitative detection and quantitative determination of lactate dehydrogenase in sera wherein the test means comprises a reagent composition incorporated within a bibulous carrier. (
  • 5.3 In addition to providing a measure of instrumented absorbed energy ( W t ), instrumented testing enables the determination of characteristic force, partial instrumented absorbed energy, and displacement parameters. (
  • PCD tools tend to outperform diamond-coated drills in materials with high plastic content because they can maintain a sharper cutting edge. (
  • Composites are as varied as the matrix formulation, fiber type, fiber content, fiber orientation, and build-up of the material. (
  • Cellulose diacetate (general laboratory grade with 39.8% acetyl content, from Aldrich Chemical Company) and harbour marine sediment (certified reference material PACS-1 supplied by Laboratory of the Government Chemist) were finally chosen. (
  • I'd like to put together a set of 'challenging' test files - content that is difficult to compress without artefacts or pumping. (
  • However, these materials can suffer degradation by a number of mechanisms and their suitability, including chemical compatibility and fitness for purpose, needs to be ascertained by non-metallic materials testing. (
  • As well as being resistant to prevailing industrial environments, non-metallic materials need to be compatible with production chemicals and endure operational events such as rapid decompression. (
  • With increasing frequencies the material is impairing the ultrasonic waves on the other hand. (
  • To predict changes in building appearance over time , the colorimetric parameters of building materials and components are analyzed to characterize their stability or risk of color deviations or yellowing due to ageing and wear. (
  • Linking WEEE Collection and CRM Recovery The recovery activities directly followed the successful completion of collection trials, including a school collection triali, which enabled both business to consumer and business to business WEEE to be processed at the Re-Tek facility using the organisation's standard procedures that have been developed and tested over a number of years. (
  • In the Charpy test , the test piece is held horizontally between two vertical bars, much like the lintel over a door. (
  • Nonmetals such as wood may be tested as supported beams, similar to the Charpy test. (
  • The microprocessor based testing system described in this paper is used to quality audit and develop clutch friction materials at the John Deere Product Engineering Center in Waterloo, Iowa. (
  • The major objective of this project was to develop mixture proportions for controlled low-strength material (CLSM) using clean coal ash obtained from atmospheric fluidized bed combustion (AFBC). (
  • Systems analysts are assigned to each project to develop and implement a comprehensive test and evaluation program. (
  • Throughout a given program, analysts review the test requirements, develop detailed test plans and monitor the collection of data during test and simulation activities. (
  • Dr Schleyer and aeronautical engineer Prof Wesley Cantwell have secured a £150,000 grant to test and develop the blast-proof, thermoplastic fibre-metal laminates, known as FMLs. (
  • SGS soil testing is enabling project leaders to assess the suitability of the soil, providing them vital data to foster informed decision making and planning. (
  • In particular, to assess the quality of cellular insulation , the laboratory tests rigid expanded foams, which can contain gases other than air. (
  • Material Testing Materials (biomaterials as well as inorganic or organic materials) and devices (integrated circuits, LED, Solar cell etc.) need analysis to assess product quality, functioning, safety, reliability and toxicity. (
  • Test data from the programs are processed in the Army Test and Evaluation Command (ATEC) Standard Data Collection System (SDCS) and provide test incident reports to assess overall system performance. (
  • Because Reichhold personnel do not need to focus on the mechanics of performing a test, they can put more focus on more value-added tasks such as data analysis. (
  • The apparatus is robust enough to allow the testing of liquid, gaseous or solid environments, being also equipped with a special groove that retains an unsoiled portion of the testing agent for analysis purposes. (
  • The Material Fatigue Testing Machine market analysis is provided for the international market including development history, competitive landscape analysis, and major regions' development status. (
  • A key activity in the successful development and execution of an effective test program is system analysis. (
  • Warhead arena tests, warhead penetration tests and failure analysis of explosive components are also available. (
  • Photron high-speed cameras have been designed to meet the requirements of specialized analysis techniques employed in materials testing including Digital Image Correlation. (
  • Three of the remaining six classifications relate to low-density foam materials commonly used in fabricating speaker grills and sound-damping material (HF-1, HF-2, HBF). (
  • Today, the annual budget is just shy of $15 million, and the facility regularly tests, among other things, the resilience of commonly used types of roofing, siding, garage doors, porches and even landscaping during disasters. (
  • For vital assurance that foundations are constructed properly and with materials that meet project specifications we verify and record the installation of piers, piles or shafts on-site throughout the installation and verify the material strength. (