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 ...
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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 ...
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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. ...
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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 ...
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 ...
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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 ...
The book I recommend for reading is Fracture mechanics: fundamentals and applications, by T.L.Anderson, 3rd edition, 2005. I first saw this book on the top list of reading materials of Brown U. When I have it I found so pleasent to read through it. Here is the short-list of its content Chapter 1: Introduction: History and overview Chapter 2:Fundamental concepts: linear elastic fracture mechanics Chapter 3: Elastic-plastic mechanics Chapter 4: Dynamic and time-dependent fracture Chapter 5: Material behavior: Fracture mechanics in metals ...
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...
Materials Testing. 51 (11-12): 748-754. doi:10.3139/120.110094. ISSN 2195-8572. S2CID 135684020. Nielsen, J. (2009-01-01), ... Resilient rail wheels have a resilient material, such as rubber, between the wheel and tire. Failure of such kind of wheel was ... Worn wheels or wheels with a flat spot are machined on a wheel lathe if there is sufficient thickness of material remaining. ... Modern railway wheels are manufactured reasonably thick to provide an allowance of wear material. ...
Materials Testing. 63 (3): 235-244. doi:10.1515/mt-2020-0034. ISSN 2195-8572. S2CID 232433079. "Itoigawa City, Niigata ... Because of the difficulty of working this material, all the axe heads of this type found are thought to have been non- ... Jadeite jade is the most valuable form, with the highest-quality material commanding prices well in excess of $200 per carat as ...
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Paper, Materials testing). ... TAPPI Test Method T 511: Folding endurance of paper (MIT tester ... the calliper of the test piece, etc., as well as which type of folding tester that is used affect how many double folds a test ... In paper testing, folding endurance is defined as the logarithm (to the base of ten) of the number of double folds that are ... TAPPI Test Method T 423: Folding endurance of paper (Schopper type tester). Fold number Double fold ISO 5626:1993 Paper - ...
Paper, Materials testing). ... endurance for each test piece and n is total number of test ... Fold number refers to how many double folds that are required to cause rupture of a paper test piece under standardized ... "the number of double folds which a test strip withstands under specified conditions before a break occurs in the strip"; that ...
Materials testing, Fracture mechanics). ... In this case, the material's fracture toughness is given by the ... The Palmqvist method, or the Palmqvist toughness test, (after Sven Robert Palmqvist) is a common method to determine the ... S. Palmqvist, Occurrence of crack formation during Vickers indentation as a measure of the toughness of hard materials, Arch ... Roebuck, Bryan; Bennett, Eric; Lay, Lewis; Morrell, Roger (2008). "Palmqvist Toughness for Hard and Brittle Materials" (PDF). ...
"Material Testing Laboratory Iuav". EU MIES AWARD. "Locations and maps". "Iuav Courses". "Bachelor of ... 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, ...
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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.". ...
"Resilience Testing , Polymer Material Properties Testing". Smithers. Retrieved 2021-12-25. "Polyurethane Testing". Pleiger ... The test for Bayshore Resilience is used to test the elasticity of polyurethanes. Under National Federation of State High ... or an estimate of the energy-absorbing statistics of a material in reference to another material. A ratio of 100 percent ... The ratio is determined by dropping a weighted ball onto the material to be measured, and then taking the ratio of the rebound ...
The Surgical Materials Testing Laboratory, which provides testing and technical services to the Welsh NHS on medical devices, ... "Surgical Materials Testing Laboratory". Retrieved 10 February 2019. "Ty Llidiard Bridgend mental health unit 'shortfalls'". BBC ...
67 (7) (2011), p. 24 "Plastic Materials Testing". Retrieved July 15, 2021. (Materials testing, Threshold temperatures) ... If a material has not been investigated (yet), the RTI shown is based on the generic class (polymer type) of the material. ... For a full study, the candidate material (B) is aged together with a reference material A (control) with already known RTI ... for films and other nonrigid materials. UL 746B, 5. Ed.: Polymeric Materials - Long Term Property Evaluations N. Navarro: ...
for Testing and Materials (1986). A. Casel and H. Jorke, Appl. Phys. Lett., 50, 989 (1987) R. Holm, Electric Contacts, Almquist ...
American Society for Testing Materials. Committee C-9 on Concrete and Concrete Aggregates (1 January 1956). Significance of ... It is described by American Society for Testing and Materials as follows: "Segregation in concrete is commonly thought of as ... A Résumé of Present Information on the Significance of the Properties of Concrete and Concrete Aggregates and the Tests by ... Civil Engineering Materials. Tata McGraw-Hill Education. ISBN 978-0-07-460431-1. Retrieved 20 May 2012. ...
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). (Orphaned articles from April 2022, All orphaned ...
... 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, ...
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"Glazes: Materials, Mixing, Testing, Firing." Ceramic Arts Daily - Featured Tip of the Day. Ceramic Publications Company, 5 Nov ... 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 ... Typically, pieces removed from the hot kiln are placed in masses of combustible material (e.g., straw, sawdust, or newspaper) ...
American Society for Testing Materials. p. 563. Retrieved July 28, 2022. "Gillmore, Quincy Adams (1825-1888)". Army Cemeteries ... There he became a prominent civil engineer, authoring several books and articles on structural materials, including cement. ...
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 ...
Paint Testing Manual. American Society for Testing & Materials. p. 493. ISBN 9780803100992. Daniel R. Gamota; Jie Zhang; ...
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 ...
American Society for Testing Materials. Sectional committee Z11 on petroleum products and Evaluation of Petroleum Products. ... Other road tests included driving on bumpy surfaces, in the sand, and the mountains. In total, each engine was tested for the ... Philadelphia, Pa.: American society for testing materials, 1940. p. 27 "Winter Meeting of the Society for Automotive Engineers ... as well as a block test of 48 hours. The engines were also tested for speed on the Vanderbilt track in Long Island. ...
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 ...
Ultrasonic Testing of Materials. Springer. pp. 119-49. 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 ...
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: ...
... :The Concept Paper of the CCR (Report). American Society for Testing and Materials. 2013. Trotter, ...
Soviet-Swedish bilateral relations were tested during Palme's second span of time as prime minister in the 1980s, in particular ... was scheduled to be released in an edited form but Palme thought the material was too socially important to be cut.[33][page ... and owned the only registered .357 Magnum in the Stockholm vicinity not tested and ruled out by authorities, which as yet has ...
Microscopic examination of a thin section of pot material reveals the minerals present in the grains of clay. The mineral ... Specrometers are used less frequently in archaeology as they destroy the sample; in fact, Law 3028 forbids destructive tests of ... By that time also new methods of chemical analysis of inorganic material were available, which are generally classified as " ... The laboratory specializes in petrology and analysis of inorganic materials, especially ceramics, by x-ray fluorescence. For ...
Pratt, P. L. (2010). "Testing the Bows". In Hardy, Robert (ed.). Longbow: A Social and Military History. Yeovil, Somerset: ... This range is given by material scientists and is supported by most modern historians. Some historians argue that the range of ...
It is also the starting material for bile acids that are made by the liver and used to digest fats, and for steroid hormones. ... Because of this, when someone starts taking a statin, doctors check liver blood tests after six weeks. Doctors also warn ...
A 2021 study tested 231 makeup and personal care products and found organic fluorine, an indicator of PFASs, in more than half ... Many PFAS were used in the mid 20th century as products or precursors for materials due to their enhanced water-resistant ... Groundwater is tested at locations throughout the state by various parties to ensure safety, compliance with regulations, and ... Early clinical testing showed a high prevalence of respiratory health effects. Early symptoms of exposure often presented with ...
He also established warehouses in Zanzibar, Madagascar and Sumatra, where raw materials such as vanilla, cloves, pepper, ylang- ... The importance of scientifically tested products and the "try before you buy" approach, was a hallmark of the Rawleigh's brand. ... J.R. Jackson, his brother-in-law, under Rawleigh's supervision, made careful tests and established new standards of strength ... Rawleigh's manufactured its own packaging and labeling materials, had a bottle manufacturing factory in Freeport, and even ...
"As the project evolved, to make sure we were on the right track, we did a lot of real world testing - first in Hokkaido, and ... The interior is a Type S specific yellow and black Alcantara material scheme (similar to the CR). Leather interior from the ... The car was tested primarily on race tracks and mountain roads of Japan and Europe, reflecting well the purpose of the roadster ... followed by more road testing, including a fair bit around the Hakone area. Ultimately, overall driving feel and sound were ...
The pre-test odds of a particular diagnosis, multiplied by the likelihood ratio, determines the post-test odds. (Odds can be ... Unsourced material may be challenged and removed. (June 2017) (Learn how and when to remove this template message) ... High-quality tests will have an AUC-ROC approaching 1, and high-quality publications about clinical tests will provide ... The differences in likelihood ratio between clinical tests can be used to prioritize clinical tests according to their ...
Unsourced material may be challenged and removed. (June 2022) (Learn how and when to remove this template message) ... Citrate inhibits phosphofructokinase when tested in vitro by enhancing the inhibitory effect of ATP. However, it is doubtful ...
The most widespread material in Sumer was clay, as a result many Sumerian objects are made of clay. Metals such as gold, silver ... after testing the genomes of Natufian and Pre-Pottery Neolithic culture-bearers.[22][23] Alternatively, a recent (2013) genetic ... Teaching materials". Oriental Institute in collaboration with Chicago Web Docent and eCUIP, The Digital Library. Retrieved 5 ... To the north were the hill-dwelling Subartu, who were periodically raided for slaves, timber, and other raw materials.[77] ...
Contentious material about living persons that is unsourced or poorly sourced must be removed immediately, especially if ... Lowrider Band Stands the Test of Time, Brooks, Brandon. Los Angeles Sentinel, 08-06-2009 ...
Shirley is accused of stealing the test, and it is revealed that her "silver bracelet, with her name engraved on it, was found ... perhaps reflecting the exhaustion of binding materials acquired from A. L. Burt. The size and composition of the books remained ... but rather the using up of leftover materials. ...
Exist where an agent can expect some form of a material reward like money in exchange for acting in a particular way.[17]. ... "Testing contract theory: a survey of some recent work" (PDF). Advances in Economics and Econometrics. Cambridge: Cambridge ...
A New Reading Based on New Material (Veche, Moscow, 2005).. *S.N. Semanov, Makhno. Podlinnaya Istoriya; Makhno. An Authentic ... Ël test a l'é disponìbil sota la licensa Creative Commons atribussion-partagi ugual; a podrìo aplichesse d'àutre condission. ...
Significant tests. Medical sonogram. Diagnostic medical sonography (DMS), a branch of diagnostic medical imaging, is the use of ... The courses will include some fundamental medical training as well as the required general studies material. ...
Unsourced material may be challenged and removed.. Find sources: "Brynmawr" - news · newspapers · books · scholar · JSTOR ( ... the Market Hall Cinema had been closed after Blaenau Gwent Council conducted a series of asbestos tests in the building. The ...
Unsourced material may be challenged and removed. (September 2018) (Learn how and when to remove this template message) ... and lower-beta tests of ballooning stability are possible in HSX. The new ST experiments provide an opportunity to test ... Unsourced material may be challenged and removed. (September 2018) (Learn how and when to remove this template message) ... Opportunities to test these predictions are provided by configurations such as the ST, spheromak, and FRC, which have a large ...
Work was completed in 1928 with a working tested design, and from this a series of designs was built to test various concepts. ... At the time it was generally taken that the strength of a material was E/10, where E was the Young's modulus for that material ... The F.2 was ready for flight tests in 1943 with a thrust of 2,150 lbf, and flew as replacement engines on a Gloster Meteor, the ... The "hardening" of materials due to processes such as cold rolling was no longer mysterious. Aircraft designers were better ...
Unsourced material may be challenged and removed.. Find sources: "Ljung-Box test" - news · newspapers · books · scholar · JSTOR ... This test is sometimes known as the Ljung-Box Q test, and it is closely connected to the Box-Pierce test (which is named after ... Box-Pierce test[edit]. The Box-Pierce test uses the test statistic, in the notation outlined above, given by[1] ... The test statistic is:[2] Q. =. n. (. n. +. 2. ). ∑. k. =. 1. h. ρ. ^. k. 2. n. −. k. {\displaystyle Q=n(n+2)\sum _{k=1}^{h}{\ ...
a b c America's Next Achievement Test: Closing the Black-White Test Score Gap Christopher Jencks and Meredith Phillips 1998 ... Through the use of technology, presentations can be archived so that the material can be reviewed at any time. "All teachers ... this produces test anxiety and keeps them from doing as well as they could on tests. According to Steele, minority test takers ... Standardized test scores[edit]. The racial group differences across admissions tests, such as the SAT, ACT, GRE, GMAT, MCAT, ...
The tested changes can then be added in one single edit to this template. Please discuss any changes at the talk page before ... Default is to collapse the material. For example {{cot,This is the title text,expand=true}}. bg. Sets the background color of ... Please test any changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Please consider ... Sets the width of the border line on the collapsed material. defaults to 1px. For example {{cot,This is the title text,border= ...
Final flight tests[edit]. By February 2014, 800 hours of test flying had been completed.[47] On 24 March 2014, the first ... The design is made entirely of composite material, a first for a production jet. The enclosed cabin is 5.1 ft (1.56 m) wide and ... Initial flight tests[edit]. The Vision Jet was first flown on 3 July 2008 at the Duluth airport.[17][18][19] It was then flown ... The second conforming test aircraft flew in November 2014.[52] The third and final conforming test aircraft made its first ...
38 in 2001 was an odds-and-ends collection of unreleased material from his solo career.[13] In 2006, he released The Entire ... Three Seconds Test Cupcake 2004 cover art [6] Feedbag Stickfigure Monolyth 1998 mixer [6] ...
Unsourced material may be challenged and removed.. Find sources: "Act of Uniformity 1662" - news · newspapers · books · scholar ... Combined with the Test Act, the Corporation Acts excluded all nonconformists from holding civil or military office, and ...
Under his supervision some faculties and some students gifted the institute a research lab with its own course material and ... MBA students are admitted through Management Aptitude Test (MAT). Academic programmes[edit]. Undergraduate ... facilities for viewing on-line journals and of course more number of books and printed materials than before. ...
Unsourced material may be challenged and removed. (November 2018) (Learn how and when to remove this template message) ... But on average, for the last fifty years, the field hasn't tested dinosaur orthodoxy severely enough.[66]: 27 ...
Unsourced material may be challenged and removed.. Find sources: "Civic, Social and Political Education" - news · newspapers · ... A total of 40% of the marks in the exam were awarded for a written theory test, which included such things as producing a ...
"American Society for Testing and Materials (ASTM).. *. "EINECS". European INventory of Existing Commercial chemical Substances. ... "New Semiconductor Materials. Characteristics and Properties". Ioffe Institute Databases.. *. "Spectral Database for Organic ... All data as presented in these tables are for materials in their standard state, which is defined to be 25 °C and 100 பாசுக்கல் ...
Embery G, Milner AC, Waddington RJ, Hall RC, Langley MS, Milan AM (২০০৩)। "Identification of proteinaceous material in the bone ... Feduccia, A.; Lingham-Soliar, T; Hinchliffe, JR (২০০৫)। "Do feathered dinosaurs exist? Testing the hypothesis on neontological ...
Unsourced material may be challenged and removed.. Find sources: "Hobart's Funnies" - news · newspapers · books · scholar · ... Many of the ideas had already been tried, tested or were in experimental development both by Britain and other nations. For ... The Americans tested the CDL at the secret Camp Bouse in Bouse, Arizona. ...
... 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. ... where to get tested, and how to understand your test results. ... Pocket Guide: HIV Testing. This pocket guide provides information about HIV testing, including how to find an HIV test and what ... Info Sheet: HIV Testing 101. This info sheet provides basic information about HIV testing, ...
Study Companions, interactive practice tests, videos and more. ... Get ready for your Praxis test with free and affordable test ... Test ID is invalid. Please select a valid test ID from the Test drop down field. ... Not sure what test you need to take? See what tests your state requires for licensure. ...
... issue 12 of the journal Materials Testing was published in 1974. ... Materials Testing is a SCI-listed English language journal ... Zerstörungsfreie Materialprüfung" / "Non destructive materials testing" / «Essais non destructifs ». Unable to retrieve ... dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into ... The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It ...
Testing and Certification Testing Methodology Manufacturers of floor covering materials, floor treatment materials and walkway ... Slip Resistance Testing and Certification for Floor Materials. In an effort to meet the growing safety needs of our customers, ... Sweeping compound materials *Walkway construction materials used as floor plates, ramps and stair treads that are made of ... The testing method involves preparation of the representative floor surfaces and then testing to determine their static ...
Testing related book titles and textbooks published by Routledge and CRC Press. ... View our complete catalog of authoritative Materials Characterization & ... Advanced Composite Materials and Structures: Modeling and Analysis. Mohamed Thariq Hameed Sultan, Vishesh Ranjan Kar, Subrata ... Fundamentals of Crystallography, Powder X-ray Diffraction, and Transmission Electron Microscopy for Materials Scientists ...
Engineering-Impact test determines the amount of energy absorbed by a material during fracture. Find out more. ... The test material impedes the motion of the pendulum arm by absorbing the energy of the impact. A higher toughness material ... Fracture surface of two Charpy specimens after testing, a) ductile material, b) brittle material. ... An arm is swung down in a pendulum motion to impact with the test material. The energy required to fracture the sample is ...
PFAS, PFNA, PFOS, and PFOA Testing. *Pharmaceutical, Medical Devices, Biotechnology Testing *Microbial Testing for CBD Products ...
... or validity of test methods - found when using mechanical test methods during a test program for additively manufactured ... New Guide for Mechanical Testing of Polymer Additively Manufactured Materials. 1. Scope. To develop a standard guide(s) that ... of polymer AM materials so that process induced nuances can be accounted for prior to starting a qualification or testing ... ASTM International is providing no-cost public access to important ASTM standards used in the production and testing of ...
It identifies current nondestructive test methods and ultrasonic test techniques applicable to cannon tubes, cast armor plate, ... Keywords Test methods Artillery Inspection equipment Pretest inspection Liquid penetrant inspection Magnetic particle ... inspection Metallurgical tests Physical measurement Radiographic inspection Wear effects Weldments. ... standard techniques and facilities for evaluating surface and subsurface characteristics of metallicnonmetallic materials. ...
The Rules for the Manufacture, Testing and Certification of Materials July 2022, includes the following Chapters:. *Chapter 1 ... Notice No.4 Rules for the Manufacture, Testing and Certification of Materials, July 2021 (Corrigenda) ... Notice No.1 Rules for the Manufacture, Testing and Circulation of Materials, July 2021 ... Notice No.2 Rules for the Manufacture, Testing and Circulation of Materials, July 2021 ...
The UAEs Ministry of Industry and Advanced Technology has signed an agreement with American Society for Testing and Materials ... UAE seals deal with American Society for Testing and Materials. ABU DHABI, September 24, 2022. The UAEs Ministry of Industry ... has signed a MoU with global standardisation organisation American Society for Testing and Materials (ASTM) to promote the ...
is hiring now for a Full-Time Construction Materials Testing Technician, Level III in Austin, TX. Apply today at CareerBuilder! ... Construction Materials Testing Technician, Level III. Tolunay-Wong Engineers, Inc. Austin, TX Full-Time ... Construction Materials Testing Technician, Level III job in Austin at Tolunay-Wong Engineers, Inc.. ... Sample or perform basic and advanced tests of soils, concrete, asphalt and other materials in the field or laboratory. Report ...
The professor claims students were infringing his copyrighted material and demands disciplinary action be taken against the ... Chapman University Professor Sues Students For Posting Test Materials Online By Tiffany Ujiiye ... Course Hero said it will cooperate with a subpoena to release the names of students who posted the material, and that the ... The unnamed students are accused of posting his exam materials on Course Hero - a site popular among students for sharing ...
Component-level testing is used in addition to calculations and simulations. ... At the materials testing laboratory the Competence Center Mechanical Systems tests materials destructively as well as non- ... bending test, climbing drum peel test), bonding adhesive tests (floating roller peel test, T-peel test, tensile shear test), ... Material Testing When materials show what they are made of At the materials testing laboratory the Competence Center Mechanical ...
Upholstery Fabrics and Interlining Materials Used in the Smoldering and Small Open Flame Testing (4014) ...
... the test technician and others.. a010690SeriesTitle: Force and Material Testing. a0106101Title: Material Testing. ... a0105101Title: Material Testing. a0105201Description01: L3 Systems are optimized for users involved with material testing and ... a010110SeriesTitle: Force and Material Testing. a010120ProductTitle: Material Testing. a010170Brand: Starrett. ... L3 systems represent a new and easier solution for creating a test; performing a test; analyzing your test results; and ...
Leading Edge Materials) or (the Company) (TSXV: LEM) (Nasdaq First North: LEMSE) (OTCQB: LEMIF) is pleased to... ... 22, 2018 /CNW/ - Leading Edge Materials Corp. ("Leading Edge Materials") or ("the "Company") (TSXV: LEM) (Nasdaq First North: ... About Leading Edge Materials. Leading Edge Materials is a Canadian public company focused on production of high value critical ... Leading Edge Materials Reports Spheronising Test Results from Woxna Graphite Project, Sweden ...
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Selected ASTM Standards for Fence Materials and Products. American Society for Testing and Materials, ASTM Committee F-14 on ... Selected ASTM Standards for Fence Materials and Products. Authors. American Society for Testing and Materials, ASTM Committee F ... shipment solution spacing specification spray steel strength stripped structural surface Table temperature Test Method test ... gate Grade Hot-Dip incl indicates inspection installed last revision length less limited manufacturer Marking material measured ...
... Achieving field densities close to maximum dry density of ... TRT Terms: Compaction; Cone penetrometers; Density; Evaluation and assessment; Granular materials; Moisture content; Quality ... However, the OHD curves were not developed for granular materials and use of them was observed to result in error and ... In response to a need for development of methods for compaction quality control of granular materials, a SDDOT-funded research ...
Corona Division announced the results of a year-long evaluation of label materials marked ... Metalphoto was the only material to pass every test (with the exception of MIBK solvent immersion test, which all materials ... Report Identifies Metalphoto as the Only Label Material to Pass Every Test Not Conducted to Failure (all materials failed the ... Metalphoto® Achieves Highest Score on More U.S. Navy Environmental Survivability Tests than Any Other Material Tested. ...
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The NCDOT Material Suppliers Map features construction material suppliers in and around North Carolina. Material Suppliers ... For questions & feedback about this area of Connect NCDOT, contact Materials and Tests. ... NCDOT Material Suppliers Map (GO! NC GIS Online)​. *GO! NC is the North Carolina Department of Transportations (NCDOT) portal ... Service Group : 09 PRODUCER/SUPPLIER FACILITY APPROVAL AND MATERIAL CERTIFICATIONS ‎(4) Service Group : 10 ASPHALT PAVEMENT ...
Requirements and test methods for condoms made from synthetic materials ... Male condoms - Requirements and test methods for condoms made from synthetic materials. ... requirements and the test methods applicable to male condoms produced from synthetic materials or blends of synthetic materials ... All Rights Reserved All ISO publications and materials are protected by copyright and are subject to the users acceptance of ...
Copyright © 2022 Public Building Commission of Chicago. All Rights Reserved. The PBC logo is a trademark of the Public Building Commission of Chicago. Legal Notice ...
If you would like to discuss this new test method or want to learn ore about EWIs testing capabilities, you can contact Laura ... EWI has created a new bendability testing method that combines the VDA test with digital image correlation (DIC) to produce ... The results are discussed in VDA Tight Bend Radius Testing with Digital Image Correlation by EWI Applications Engineer Laura ... While the VDA tight bend radius test is the standard in industry, it does not measure strain fracture limits. ...
Education Organisations in Northland - Test and select materials for a design task. There are 35 Education Organisations in ... Materials Technology (to level 4) View details » Te Kura Kaupapa Maori o Whangaroa Kaeo Materials Technology (to level 4) View ... Materials Technology (to level 4) View details » Te Kura Kaupapa Maori o Kaikohe Kaikohe Materials Technology (to level 4) View ... Materials Technology (to level 4) View details » Te Kura Kaupapa Maori o Taumarere MOEREWA Materials Technology (to level 4) ...
... it looks like Google is working on a Material redesign for the app. ... Google testing Material redesign of Google Home app. If you think the Google Home app looks a bit dated, dont worry: it looks ... But since Google is dead set on bringing Material Design elements to all of its products (and all of Android in general), it ... Now, it looks like a redesign with Material Design elements is coming to Google Home. ...
  • Characterization of Reference Materials for Spinal Muscular Atrophy Genetic Testing: A GeT-RM Collaborative Project. (
  • To develop a standard guide(s) that will document and address the key learnings consisting of testing modification, interpretation of results, or validity of test methods - found when using mechanical test methods during a test program for additively manufactured specimens. (
  • It identifies current nondestructive test methods and ultrasonic test techniques applicable to cannon tubes, cast armor plate, welded joints, projectile fuzes, vehicle track shoes, and other items in which detection of cracks, voids, corrosion, and thickness variations is important. (
  • Keywords Test methods Artillery Inspection equipment Pretest inspection Liquid penetrant inspection Magnetic particle inspection Metallurgical tests Physical measurement Radiographic inspection Wear effects Weldments. (
  • ISO 23409:2011 specifies the minimum requirements and the test methods applicable to male condoms produced from synthetic materials or blends of synthetic materials and natural rubber latex which are used for contraceptive purposes and to aid in the prevention of sexually transmitted infections. (
  • The producer is deploying CarbonCure technology at its Springfield, Va., plant-strategic to the northern Virginia and Washington, D.C. market, where federal agencies, developers and the design community drive project specifications friendly to reduced-carbon building materials, methods and products. (
  • Material analysis and quality characteristics should be tested in accordance with test methods specified by the American Society for Testing and Materials (ASTM), the Technical Association of the Pulp and Paper Industry (TAPPI), the American National Standards Institute (ANSI) and/or the International Organization for Standardization (ISO). (
  • A specification identifies the test methods for determining whether each of the requirements is satisfied. (
  • Level 2 laboratories test a smaller list of chemical threat agents, LRN-C methods are cus- tomizable and can be readily adapted to detect broad classifications of new and emerging threat agents. (
  • Development of Criteria and Test Methods for Eye and Face Protective Devices. (
  • Some of the requirements and test methods of Z87.1 have been unchanged for many years or are not clearly defined, hence there exists a need to determine whether performance requirements are adequate and to improve test methods. (
  • Following description of a program of analytical and experimental work on three specific aspects of eye and face protection devices, recommendations are presented for significant changes in attenuation properties of light- absorptive materials such as welding plates, for a high-speed impact test employing a pointed missile, and for improved test methods for optical attributes. (
  • 4. Develop new methods to test effectiveness of PPT for workers, including workers engaged in infectious disease activities. (
  • 6. Develop and evaluate innovative PPT designs and test methods to improve comfort, fit and usability. (
  • These studies may also be used by national and international standards development organizations to support new test methods. (
  • Fracture surface of two Charpy specimens after testing, a) ductile material, b) brittle material. (
  • They then evaluated specimens of the materials in strength-retention and permeation tests. (
  • The purpose of this study is to conduct full-scale seismic tests of several types of exterior joint (including roof level joint) specimens using headed bars with some variables which are not discussed in the current guidelines (e.g., high-strength materials, post-tensioning), and analyze/compare the results of each specimens behavior. (
  • All the specimens showed very ductile behavior, and the post-tensioned specimens generally maintained its lateral capacity until the end of testing. (
  • Providers should contact their health department to coordinate sending specimens to CDC for testing. (
  • And when that happens, usually the cases are escalated and the specimens are sent to state laboratories that have some advanced strategies to do things like real- time RT-PCR testing or even sequence analysis of the genetic material in the clinical specimen. (
  • EaseToLearn FCI Manager & MT online Free Mock Test 2023. (
  • Sample or perform basic and advanced tests of soils, concrete, asphalt and other materials in the field or laboratory. (
  • The Materials Inspection and Testing Group conducts soil and footing inspections, reinforcing steel inspection, concrete testing with certified staff and laboratory facilities, structural steel inspection and shoring inspection. (
  • We use to have our material tested by MIRDC in Bicutan, Manila but most independent testing lab that do Standard material testing on steel and concrete should have the equipment. (
  • Licensing for ready mixed production extends a presence CarbonCure has realized in licensing and equipment installations involving U.S. and Canadian concrete masonry producers Basalite Concrete Products, Ernst Maier, Mutual Materials, Oldcastle Architectural (Anchor, Northfield, Permacon) and Shaw Brick. (
  • CIPPOC's are a simple and economical method of determining the in-place strength of poured concrete for various structural elements, without the expense of coring and the uncertainty of separately cast and cured test cylinders. (
  • Tests on Polymer Modified Cement Concrete (PCC) have shown significant large creep deformation. (
  • Our structural engineering laboratory covers an extensive material testing laboratory that demonstrates experiments with structural steel, concrete, timber and engineered wood products (EWPs), road materials, etc. (
  • ASTM International is providing no-cost public access to important ASTM standards used in the production and testing of personal protective equipment. (
  • Users can consist of machine operators, printer OEMs, testing houses, ASTM sub-committee members, technology adopters/type-certification holders, and certification regulators. (
  • The UAE's Ministry of Industry and Advanced Technology (MoIAT) has signed a MoU with global standardisation organisation American Society for Testing and Materials (ASTM) to promote the growth of UAE's economy and further develop national standards for health, safety, and the environment. (
  • There are no current international standards (ASTM, ISO, IEC, CEN, etc.) published yet for material degradation tests against UV-C germicidal radiation used by sterilization devices. (
  • 8. Recommended revised ASTM test criteria after evaluating isolation gowns from six manufacturers using current performance requirements. (
  • In England, the new nationally commissioned NHS Genomic Medicine Service (GMS) commenced in January 2019, aiming to provide England's 55 million population with consistent access to cutting-edge genomic testing, utilizing knowledge from the 100,000 Genomes project. (
  • Bolt shear tests, pull test on snap joints, fracture behavior of façade mountings, durability testing of rubber rollers or bending tests of metallic hoses and bellows are only a few examples. (
  • The study was commissioned to help item managers navigate the large variety of commercially available label materials and provide an unbiased, Government sponsored comparison of durability. (
  • The Atlas UVCTest™ is designed to test the durability of materials exposed to UVC radiation centered at 254 nm. (
  • Furthermore, Micom offers the automotive industry many test services for car subassemblies to insure car safety and durability. (
  • When it comes to predicting the durability or performance of a given material for use in a specific application, it's crucial to evaluate chemical and physical properties as well as environmental compliance and quality control. (
  • Smithers provides print quality and durability testing supported by detailed off the shelf reports on future market trends in print, strategic consultancy research to meet your print business needs and dynamic conferences attracting global decision makers from across the print supply chain. (
  • The guide(s) will be used to augment the set of standards used for mechanical performance characterization of polymer AM materials so that process induced nuances can be accounted for prior to starting a qualification or testing program. (
  • At the materials testing laboratory the Competence Center Mechanical Systems tests materials destructively as well as non-destructively for their response to static and dynamic loading. (
  • The CC Mechanical Systems offers our know-how for support during conception, implementation and realization of custom jigs and fixtures for specific testing tasks. (
  • WSP is qualified and certified to conduct the necessary testing associated with geotechnical investigations of the physical/mechanical properties and characteristic behaviors of surface and subsurface earth materials. (
  • As part of that work, engineers analyzed the thermal and mechanical properties of potential shield materials and developed mathematical models to predict their performance in re-entry conditions. (
  • The mechanical consultants, Keen Engineering, were also able to re-use materials and equipment. (
  • 3) Computational and experimental analysis of the mechanical, thermal, and mass transport behavior in a variety of high-performance materials from the atomistic to the microstructure level. (
  • Strain measurement is important in mechanical testing. (
  • A customer wants to conduct a tensile force test on different samples and materials until failure. (
  • Our team can conduct industry standard tests or design a custom testing protocol to meet your unique needs. (
  • Liebherr specialists conduct stringent tests on every machine to ensure they meet our exacting quality standards. (
  • Conduct the test in a well-lit room with minimal noise and without extraneous materials. (
  • Instead it is an eyecatching, simple structure that contains an office, storage areas and industrial laboratory where the city tests road materials such as asphalt. (
  • This report describes standard techniques and facilities for evaluating surface and subsurface characteristics of metallicnonmetallic materials. (
  • The tensile test is conducted, and force results captured by the load cell and extensometer are synced through the SI-USB4 4 Channel USB Interface Module. (
  • The 1200 Standard Precision LowProfile™ Load Cell is installed into the customer's tensile test load frame. (
  • To carry out the tensile test experiments for S 235, sixty samples were cut from the web of the I-profile in longitudinal and transverse directions in four different dimensions. (
  • This gives an indication of the characteristics of the material during fracture. (
  • Short-term repeat HPV testing alone or in combination with HPV testing intrinsic characteristics seems to be useful for triage of HPV positive women. (
  • In terms of other conditions, a new blood test that identifies a variant of the protein P53 appears to predict Alzheimer's disease (AD) progression up to 6 years in advance of a clinical diagnosis. (
  • Pilot testing will help save your program time and money because it identifies which messages and materials work best with your target audiences. (
  • Smithers offers extensive document security testing to evaluate and accredit secure documents in addition to designing in-depth market reports with industry analysis and future forecasts on security. (
  • If you are considering sustainable materials, such as recycled polymers, recylate-based compounds or other novel materials materials - Smithers' experts will help you navigate material choices and risks, evaluate and optimize performance, environmental credentials, compliance and more. (
  • Evaluation of trial ineligibility and eligibility To judge whether an individual could have fulfilled the eligibility requirements, we utilized data from enough time of failing of 1st\range treatment as the above mentioned tests had been all designed to evaluate the effectiveness of ICBs in the second\range setting. (
  • The authors emphasize that the techniques will need testing in a larger cohort of patients to confirm the results and evaluate the utility of the test in a wider clinical context. (
  • Also, be sure to review and evaluate the materials based on individual, community, and program needs. (
  • We aimed to evaluate the performance of short-term repeat HPV testing, semi-quantitative HPV viral load, and HPV16/18 genotyping for triage of HPV positive women in the ESTAMPA study. (
  • The field of nondestructive testing and materials characterization is examined with emphasis on new approaches that may lead to significantly improved future capabilities. (
  • These tests look for genetic material from the Zika virus. (
  • Unlike conventional blood-based tests for cancer, which look for genetic material from tumors, the NMR-based technique uses magnetic field and radio waves to analyze levels of metabolites in the blood. (
  • Furthermore, estimation of measurement uncertainty is presented for the basic material parameters extracted through strain measurement. (
  • Resistance is a measure of how difficult it is for electrons to pass through a material and is expressed in a unit of measurement termed an ohm. (
  • As a Technician, Level III you will perform advanced construction monitoring, field and/or laboratory tests, analyze test data and develop testing plans. (
  • The labels were subjected to ten laboratory tests designed to simulate desert, marine and submarine operating environments, including resistance to debris/chipping, abrasion, chemicals, temperature ranges and salt fog. (
  • Experiments on components with modern static and dynamic testing equipment support conclusions about loading capacity in a large range from 100 N to 200 kN. (
  • This current test program follows on from preliminary testing carried out in 2017 and delivers an insight into repeatability of equipment and operator. (
  • The spheronisation test program we have underway is delivering the data required for equipment selection for the Woxna battery material demonstration plant. (
  • The RecycLiCo™ demonstration plant testing schedule consists of an organized approach that evaluates individual processing steps with scaled up equipment and different commercially available lithium-ion battery waste feed material in comparison to the laboratory and pilot plant scale tests. (
  • At the laboratory, assorted equipment was used to simulate various service conditions and test the effects on rubber, polymers, and other materials used in the production of naval aircraft. (
  • Integrated Consortium of and equipment to support high volume testing with quick turnaround times. (
  • These laboratories must maintain adequate staffing and equipment to support high volume testing with quick turnaround times. (
  • These tests require highly trained laboratory staff and specialized equipment and materials. (
  • In this new series, we look at some of the most important components of a true packaging audit, including the questions you should ask and the factors you should consider as you critically examine your packaging-such as packaging material analysis and performance testing. (
  • Smithers offers a wide range of services relating to materials and components used in the construction industry, providing advice on initial planning, performance, material selection, and life prediction. (
  • Smithers' global team of plastics experts have decades of experience working with plastic materials, components, and products from nearly any sector. (
  • Smithers rubber testing experts have many years of experience working with rubber materials, components, and products from a wide variety of industries. (
  • Delivery of results and posttest genetic counselling are therefore key components of integrating genetic testing into routine endocrine care. (
  • The demonstration plant will have the capacity to supply meaningful (100's of kgs) quantities of lithium ion battery anode material to prospective industrial customers. (
  • LEM's flagship asset is the Woxna Graphite production facility located in central Sweden targeting the supply of specialty materials for lithium ion battery production. (
  • American Manganese Inc, doing business as RecycLiCo Battery Materials, is a battery materials company focused on recycling and upcycling lithium-ion battery waste. (
  • With minimal processing steps and up to 100% extraction of lithium, cobalt, nickel, and manganese, the patented, closed-loop hydrometallurgical process creates valuable lithium-ion battery materials for direct integration into the re-manufacturing of new lithium-ion batteries. (
  • For example, testing of sandwich composites (bending test, climbing drum peel test), bonding adhesive tests (floating roller peel test, T-peel test, tensile shear test), relaxation test of rubber profiles or the determination of load deflection curves of springs. (
  • In general, BT and TMDL thresholds in effect at the time a suitability determination is made will remain valid as long as the suitability determination holds: for example, even if the material is not dredged until a subsequent year or if the determination includes a Tier I testing exclusion for a future dredging episode. (
  • However, if conditions have changed substantially enough for the DMMO to require a new round of testing and a new suitability determination, the thresholds in effect at the time of the new suitability determination will be used. (
  • The study analyzed genetic material from over 2500 blood samples of pregnant women from eight independent cohorts with multiple demographics, including socioeconomic background, geographic location, ethnicity, and nationality, collected 14.5 weeks before delivery. (
  • Genomic testing for rare disease is being integrated into everyday clinical practice, as the importance of confirming a genetic diagnosis earlier in a patient's pathway helps direct their clinical care and specialized management. (
  • The range of genetic tests, technology employed and eligibility criteria for patient testing are all defined in the National Genomic Test Directory. (
  • This review provides practical guidance on how to access genomic testing for endocrine disease, how to interpret and relay results, and details how genetic counselling can help integrate results into ongoing care of the individual and their family. (
  • We illustrate mainstream genetic testing with a clinical scenario involving an individual with inherited endocrine neoplasia, followed by a generic description of the different steps involved, including informed consent to proceed to diagnostic testing. (
  • Most genetic tests analyse multiple genes simultaneously by next-generation sequencing, and variant interpretation may yield not only pathogenic explanatory results, but also ambiguous outcomes, with variants of unknown significance or incidental findings. (
  • [ 3 ] National genomic laboratory services are delivered through core and specialist testing for inherited rare diseases and cancer somatic tissue genetic testing within seven networked regional Genomic Laboratory Hubs (GLHs). (
  • The aim of this review is to provide practical guidance on how to access genomic testing for endocrine disease, how to interpret and relay results, and detail how genetic counselling can help integrate results into ongoing care of the individual and their family. (
  • Browse our selection of barnwood frames, distressed wood frames, driftwood frames, and frames made from synthetic materials and finished to look like wood. (
  • Manufacturers of floor covering materials, floor treatment materials and walkway construction materials may have their products certified to UL 410 to demonstrate the slip resistance of their products. (
  • Manufacturers who achieve the UL 410 certification can label products with the UL certification Mark, signaling to decision-makers that their product has been tested and certified by a respected, credible third-party. (
  • An ability to customize anode products based on particle size distribution and purity will allow Leading Edge Materials to meet a wide range of customers specifications. (
  • But since Google is dead set on bringing Material Design elements to all of its products (and all of Android in general ), it likely won't be long before everyone sees these changes. (
  • With Interface's force products, the customer was able to determine the tensile strength, yield strength, and yield stress of a variety of different materials. (
  • We truly understand polymer science and through our ISO 17025 accredited materials testing facilities in the UK and USA, we offer a comprehensive range of chemistry, physical testing, and technical consulting services to support the development of rubber and plastic based materials and end products. (
  • Raw Materials are materials or substances used in the primary production or manufacturing of goods / products. (
  • You may be able to use some products and materials without any modification. (
  • Desquamation seen at day 7 in 2 animals, no data on test substance purity. (
  • There are several tests that can predict the performance of corrugated boxes under these conditions, including the box compression test (BCT), edge compression test (ECT), short-span compression test (SCT), bending stiffness and the International Safe Transit Association's transportation testing procedures. (
  • The purpose of this document is to provide specific and standardized procedures and guidelines for testing larvicides, including bacterial larvicides and insect growth regulators (IGRs), against mosquitoes. (
  • Its aim is to harmonize the testing procedures carried out in different laboratories and institutions to generate data for the registration and labelling of larvicides by national authorities. (
  • This practice is not intended to supplant material specifications or existing preshipment test procedures. (
  • Devises procedures for physical testing of materials. (
  • And in this case, the New York State Department was able to demonstrate that the clinical specimen from the veterinarian was infected with an avian H7N2 virus, and then the sample was sent to CDC for some confirmatory testing. (
  • Recent studies have confirmed progress in the use of blood to test for various key conditions (see Infographic below), leading to this week's top trending clinical topic. (
  • The authors note that although the blood test could be implemented as a lab test in the near future, approval from the US Food and Drug Administration would most likely require evaluation through a prospective clinical trial. (
  • How important is patch testing with dental materials in real-life clinical practice? (
  • This triage approach may have the potential to better guide clinical management of HPV positives in the short-term with the advantage of not requiring additional tests such as cytology or visual techniques which is appealing, even more in the context of self-sampling. (
  • UL 410 Standard for Slip Resistance of Floor Surface Materials is useful for evaluating slip resistance on virtually all walkway surfaces and finishes. (
  • The study did not test for ultraviolet (UV) resistance despite the fact that fading due to sunlight exposure is a common cause of label failure. (
  • and (ii) to gain the knowledge that may be utilized for multiscale simulation-based design/manufacturing of advanced materials with desired strength, ductility, thermal-, corrosion-, irradiation-resistance, and even a combination of them. (
  • PEM Type SGPC swaging collar studs can install into most panel material, provide strong torque-out resistance and are suitable for close centerline-to-edge situations. (
  • The resistance to the flow of electricity by any material is directly proportional to the material's length and inversely proportional to its cross-sectional area. (
  • Construction Materials Testing Technician, Level III job in Austin at Tolunay-Wong Engineers, Inc. (
  • Southern Research engineers conducted tests that advanced an experimental NASA technology designed to solve a tough challenge in landing people and cargo on Mars - slowing down a spacecraft entering the Red Planet's thin atmosphere to permit a safe touchdown. (
  • The engineers conducted folding studies meant to generate a wide range of creases and folds in the flexible HIAD materials during the packing process. (
  • After that successful test, NASA said its engineers will move forward with the development of a larger HIAD that can withstand the stress of being tightly packed in a rocket and the challenges experienced when it descends through the atmosphere of a planet such as Mars. (
  • Engineers patched and improvised to design a building almost entirely of recycled materials in Vancouver.When structural engineer Paul Fast, P.Eng. (
  • Most engineers would treat this type of project as a headache," he adds, but says what is needed is a new approach: "The engineer almost has to act as a broker, connecting the client with the material. (
  • Highly experienced additive manufacturing engineers, chemists, materials scientists and production experts leverage Jabil's innovations in materials science to oversee each step of the beaker-to-box process of developing customized powders and filaments, developed to meet the specialized needs of our customers. (
  • The testing method involves preparation of the representative floor surfaces and then testing to determine their static coefficient of friction, which must be greater than a minimum accepted value in order to earn certification. (
  • The materials testing laboratory provides quality services in the field of product and process development. (
  • L3 Systems are optimized for users involved with material testing and characterization- the research engineer, the design engineer, the quality control technician, the test technician and others. (
  • L3 Systems are optimized for users involved with material testing and characterization- the research engineer, the design engineer, the quality. (
  • Supporting your needs for high quality reference materials for food and environmental analysis. (
  • South Dakota Department of Transportation (SDDOT), among several other DOTs, have been using the Ohio Highway Department's (OHD's) typical moisture/density curves for compaction quality control of granular materials and granular soils. (
  • Routine batch testing on raw material will allow manufacturer to ensure the quality of raw material before used in production / manufacturing. (
  • Our custom materials are created, tested and validated at Jabil's Materials Innovation Center in Chaska, Minn., where polymer formulations, compound developments, material system integration and Quality Management System (QMS) certifications are completed from start-to-finish under one roof. (
  • From material identification to environmental compliance support, our experts have years of experience developing analytical techniques and conducting chemical analyses of all kinds. (
  • Download Study material for preparation of Chemical Sciences for free. (
  • Gujarat Technological University(Chemical Sciences) Mock Test Paper 14 was published in 2003. (
  • LRN-C laboratories assist CDC in testing samples for chemical sures to toxic chemical agents exposures and serve as front line communication among the CDC such as cyanide, nerve agents, and local health officials, hospitals, and poison control centers. (
  • Level 1 laboratories provide 24/7 assistance to CDC by testing samples in the event vendors of a large-scale chemical emergency. (
  • Laboratory Networks (ICLN) requires these laboratories maintain testing capabilities for exposures to the following high threat chemical agents: mustard agents, nerve agents, and toxic industrial chemicals. (
  • During large-scale national events, state and local LRN-C laboratories assist CDC in testing samples for chemical exposures and serve as front-line conduit for communication among CDC and local health officials, hospitals, and poison control centers. (
  • Level 2 Laboratories must maintain testing capabilities for exposures to chemical terrorism agents such as cyanide, toxic metals, and toxic industrial chemicals. (
  • It consists of a curated series of exhibitions divided into 'Acts' in which a small group artists explore how the most unpredictable and challenging art can emerge out of a direct and physical engagement with materials. (
  • These are all materials Micom Laboratories Inc. can test to insure proper performance levels. (
  • In addition, Level 1 laboratories maintain all Level 2 testing capabilities. (
  • CDC ensures the testing capabilities of LRN-C laboratories through the services it provides to the network. (
  • You can go to the CDC Infectious Diseases Laboratories Test Directory for a list of orderable tests. (
  • Refer to the Infectious Disease Laboratories Test Directory entry for each test, see links below, for instructions on acceptable specimen types, specimen collection, storage, and shipment as well as points of contact for testing at CDC using VZV-specific serologic assays. (
  • Ssp, a Smithers company, serves the Dry Commodities industry through a wide array of services ranging from sampling tests to infrared temperature control. (
  • In the current investigation Small Punch (SP) tensile tests were carried out on IN713C at room temperature and 650 °C in an air environment under stroke control at a rate of 0.02 mm/s. (
  • Symposium Focus: the main focus of this symposium is (i) to present and discuss recent developments on atomistic-to-macroscale computer simulations of dislocation-, twinning-, phase transformation-mediated plasticity, phonon-mediated thermal transport, diffusion-mediated mass transport, as well as their interplay in heterogeneous materials exposed to extreme environments (stress, temperature, shock, irradiation, etc. (
  • This includes bullet-proof clothing, general protective clothing and full body ensembles that protect from cuts, radiation, temperature extremes, hot splashes from molten metals and other hot liquids, potential impacts from tools, machinery and materials and hazardous chemicals. (
  • The test sample comes directly from the work, with identical temperature and curing history as that evident in the slab. (
  • This specification covers the in-service care, inspection, testing, and use voltage of insulating gloves and sleeves for protection from electrical shock. (
  • 7 test per specimen is required to arrive at a certain confidence level. (
  • An arm is swung down in a pendulum motion to impact with the test material. (
  • The test material impedes the motion of the pendulum arm by absorbing the energy of the impact. (
  • A higher toughness material will absorb more energy upon impact and will therefore result in a low height to which the pendulum arm will swing to following impact. (
  • DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. (
  • The Naval Surface Warfare Center (NSWC), Corona Division announced the results of a year-long evaluation of label materials marked with Item Unique Identification (IUID). (
  • McCrea's sideline evaluation uses recitation of the months of the year in reverse order after a study by Young et al showed the lack of reliability of the "serial 7s" test (serial subtraction by 7 from 100) in the baseline evaluation of mental status even in non-head-injured athletes. (
  • The results are discussed in VDA Tight Bend Radius Testing with Digital Image Correlation by EWI Applications Engineer Laura Zoller. (
  • NASA was able to land the Mars Rover, but that is a pretty small device," said Jacques Cuneo, a Southern Research engineer involved in the testing of HIAD's materials. (
  • Jacques Cuneo is a Southern Research engineer who worked on the tests of the HIAD materials. (
  • He is a certified Software Test Engineer by profession and a blogger & a YouTuber by a choice. (
  • The role of local microstructure is critical in materials performance and integrity in a cast alloy. (
  • While the VDA tight bend radius test is the standard in industry, it does not measure strain fracture limits. (
  • Smithers' polymer testing experts can help you predict, manage and improve the performance of your polymer-based material or product while ensuring its effectiveness and compliance. (
  • Report test data with minimal or no mistakes. (
  • Different samples are tested and the force data is collected. (
  • Similar calculations are used to update TMDL in-Bay dredged material disposal limits for mercury and total PCBs when new data are available. (
  • RMP sediment data collected since 2002 form the basis for calculating both the Dredged Material Management Office (DMMO) bioaccumulation testing trigger concentrations (BTs) for mercury, PCBs and PAHs, and the TMDL-based in-Bay disposal limits for mercury and PCBs. (
  • These include fatigue testing, accelerated aging, data acquisition and control for performance monitoring as well as component cycling. (
  • But there is a need for updating these guides due to the fact that it has been established based on the limited experimental data, especially for roof level joints with headed bars, which alleviate steel congestion problem in the joint, and joint with high-strength materials. (
  • It is seen that the extensometer and strain gauge provided reliable data, however the extensometer offers several advantages over the strain gauge and crosshead motion for testing structural steel in tension. (
  • Please log in to read testing / research data. (
  • Elsewhere, recent data show that a blood-based cancer test can accurately identify cancer in undiagnosed patients with vague symptoms, even differentiating between localized and metastatic disease. (
  • A Zika virus test looks for signs of a Zika virus infection in a sample of your blood or urine (pee). (
  • Blood tests can detect yellow fever antibodies produced in response to the infection. (
  • View of two technicians using assorted apparatus to determine the electrical resistivity of high polymers at the Naval Air Material Center's Aeronautical Materials Laboratory. (
  • Custom additive materials, filaments, digital parts and more. (
  • With investment in research and development, we have produced a number of materials testing innovations - from the first strain gauge load cell to all-electric dynamic systems to video extensometry. (
  • The experiments conducted to validate this new approach tested seven different advanced high strength steels. (
  • You can download other study material including last 10 year Question Papers, Books, Notes, Test Papers for free over here . (
  • Please select a valid test ID from the Test drop down field. (
  • Achieving field densities close to maximum dry density of the granular materials is of vital importance to pavement's performance and its longevity. (
  • However, the OHD curves were not developed for granular materials and use of them was observed to result in error and inconsistencies between the lab and field-measured densities. (
  • Last year, NASA put HIAD through a key field test . (
  • Their Contract Sciences operation provides laboratory analysis and testing, field work, bench scale studies, pilot plant investigations, consulting services, applied research and development for both industry and government. (
  • The draft regional materials for community health workers on "Caring for the sick child in the community" were field-tested in El Fayoum, Egypt, from 6 to 8 July 2010. (
  • He has extensive experience in the field of Software Testing. (
  • Field testing version. (