Porosity: 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.Haversian System: A circular structural unit of bone tissue. It consists of a central hole, the Haversian canal through which blood vessels run, surrounded by concentric rings, called lamellae.Materials Testing: 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.Compressive Strength: The maximum compression a material can withstand without failure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p427)Tissue Scaffolds: 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.Microscopy, Electron, Scanning: 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.Polyesters: 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.Tissue Engineering: 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.Biocompatible Materials: Synthetic or natural materials, other than DRUGS, that are used to replace or repair any body TISSUES or bodily function.Dental Casting Investment: Material from which the casting mold is made in the fabrication of gold or cobalt-chromium castings. (Boucher's Clinical Dental Terminology, 4th ed, p168)Microradiography: Production of a radiographic image of a small or very thin object on fine-grained photographic film under conditions which permit subsequent microscopic examination or enlargement of the radiograph at linear magnifications of up to several hundred and with a resolution approaching the resolving power of the photographic emulsion (about 1000 lines per millimeter).Bone Substitutes: 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.Powders: 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)Surface Properties: Characteristics or attributes of the outer boundaries of objects, including molecules.X-Ray Microtomography: X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range.Polyglycolic Acid: A biocompatible polymer used as a surgical suture material.Implants, Experimental: Artificial substitutes for body parts and materials inserted into organisms during experimental studies.Bowhead Whale: The species Balaena mysticetus, in the family Balaenidae, found in the colder waters of the Northern Hemisphere. The common name is derived from the extreme arching of the lower jaw.Calcium Phosphates: Calcium salts of phosphoric acid. These compounds are frequently used as calcium supplements.Femur: The longest and largest bone of the skeleton, it is situated between the hip and the knee.Durapatite: The mineral component of bones and teeth; it has been used therapeutically as a prosthetic aid and in the prevention and treatment of osteoporosis.Bone and Bones: A specialized CONNECTIVE TISSUE that is the main constituent of the SKELETON. The principle cellular component of bone is comprised of OSTEOBLASTS; OSTEOCYTES; and OSTEOCLASTS, while FIBRILLAR COLLAGENS and hydroxyapatite crystals form the BONE MATRIX.Tablets: Solid dosage forms, of varying weight, size, and shape, which may be molded or compressed, and which contain a medicinal substance in pure or diluted form. (Dorland, 28th ed)Polymers: Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).Hardness: The mechanical property of material that determines its resistance to force. HARDNESS TESTS measure this property.Bone Cements: Adhesives used to fix prosthetic devices to bones and to cement bone to bone in difficult fractures. Synthetic resins are commonly used as cements. A mixture of monocalcium phosphate, monohydrate, alpha-tricalcium phosphate, and calcium carbonate with a sodium phosphate solution is also a useful bone paste.Ceramics: 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)Polyurethanes: A group of thermoplastic or thermosetting polymers containing polyisocyanate. They are used as ELASTOMERS, as coatings, as fibers and as foams.Particle Size: Relating to the size of solids.Silicon Dioxide: 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.Stress, Mechanical: 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.Bone Remodeling: The continuous turnover of BONE MATRIX and mineral that involves first an increase in BONE RESORPTION (osteoclastic activity) and later, reactive BONE FORMATION (osteoblastic activity). The process of bone remodeling takes place in the adult skeleton at discrete foci. The process ensures the mechanical integrity of the skeleton throughout life and plays an important role in calcium HOMEOSTASIS. An imbalance in the regulation of bone remodeling's two contrasting events, bone resorption and bone formation, results in many of the metabolic bone diseases, such as OSTEOPOROSIS.Fraxinus: A plant genus of the family OLEACEAE. Members contain secoiridoid glucosides.Nanocomposites: Nanometer-scale composite structures composed of organic molecules intimately incorporated with inorganic molecules. (Glossary of Biotechnology and Nanobiotechology Terms, 4th ed)Tensile Strength: 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)Apatites: A group of phosphate minerals that includes ten mineral species and has the general formula X5(YO4)3Z, where X is usually calcium or lead, Y is phosphorus or arsenic, and Z is chlorine, fluorine, or OH-. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Nanofibers: Submicron-sized fibers with diameters typically between 50 and 500 nanometers. The very small dimension of these fibers can generate a high surface area to volume ratio, which makes them potential candidates for various biomedical and other applications.Bone Regeneration: Renewal or repair of lost bone tissue. It excludes BONY CALLUS formed after BONE FRACTURES but not yet replaced by hard bone.Physicochemical Processes: Physical reactions involved in the formation of or changes in the structure of atoms and molecules and their interactions.Diaphyses: The shaft of long bones.Permeability: Property of membranes and other structures to permit passage of light, heat, gases, liquids, metabolites, and mineral ions.Ursidae: The family of carnivorous or omnivorous bears, having massive bodies, coarse heavy fur, relatively short limbs, and almost rudimentary tails.Drug Compounding: The preparation, mixing, and assembling of a drug. (From Remington, The Science and Practice of Pharmacy, 19th ed, p1814)Polyvinyl Alcohol: A polymer prepared from polyvinyl acetates by replacement of the acetate groups with hydroxyl groups. It is used as a pharmaceutic aid and ophthalmic lubricant as well as in the manufacture of surface coatings artificial sponges, cosmetics, and other products.Chitosan: Deacetylated CHITIN, a linear polysaccharide of deacetylated beta-1,4-D-glucosamine. It is used in HYDROGEL and to treat WOUNDS.Biomechanical Phenomena: The properties, processes, and behavior of biological systems under the action of mechanical forces.Equipment Failure Analysis: 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.Radius: The outer shorter of the two bones of the FOREARM, lying parallel to the ULNA and partially revolving around it.Nanostructures: 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.Biofouling: Process by which unwanted microbial, plant or animal materials or organisms accumulate on man-made surfaces.Water: 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)Sophora: A plant genus of the family FABACEAE.Tibia: The second longest bone of the skeleton. It is located on the medial side of the lower leg, articulating with the FIBULA laterally, the TALUS distally, and the FEMUR proximally.Hydrogels: 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)Elastic Modulus: 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.Titanium: 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)Chemistry, Pharmaceutical: Chemistry dealing with the composition and preparation of agents having PHARMACOLOGIC ACTIONS or diagnostic use.Quartz: Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed)Computer-Aided Design: The use of computers for designing and/or manufacturing of anything, including drugs, surgical procedures, orthotics, and prosthetics.Bone Density: The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS.Cementation: The joining of objects by means of a cement (e.g., in fracture fixation, such as in hip arthroplasty for joining of the acetabular component to the femoral component). In dentistry, it is used for the process of attaching parts of a tooth or restorative material to a natural tooth or for the attaching of orthodontic bands to teeth by means of an adhesive.Carboxymethylcellulose Sodium: A cellulose derivative which is a beta-(1,4)-D-glucopyranose polymer. It is used as a bulk laxative and as an emulsifier and thickener in cosmetics and pharmaceuticals and as a stabilizer for reagents.Osteocytes: Mature osteoblasts that have become embedded in the BONE MATRIX. They occupy a small cavity, called lacuna, in the matrix and are connected to adjacent osteocytes via protoplasmic projections called canaliculi.Glycols: A generic grouping for dihydric alcohols with the hydroxy groups (-OH) located on different carbon atoms. They are viscous liquids with high boiling points for their molecular weights.Decanoates: Salts and esters of the 10-carbon monocarboxylic acid-decanoic acid.Osseointegration: The growth action of bone tissue as it assimilates surgically implanted devices or prostheses to be used as either replacement parts (e.g., hip) or as anchors (e.g., endosseous dental implants).Magnesium Oxide: 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.Filtration: 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)Rhamnaceae: The buckthorn plant family, of the order Rhamnales, includes some species with edible fruits and some that are medicinal.Lactic Acid: A normal intermediate in the fermentation (oxidation, metabolism) of sugar. The concentrated form is used internally to prevent gastrointestinal fermentation. (From Stedman, 26th ed)Microspheres: Small uniformly-sized spherical particles, of micrometer dimensions, frequently labeled with radioisotopes or various reagents acting as tags or markers.Freeze Drying: 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.Polyethylene Terephthalates: 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.Osteogenesis: The process of bone formation. Histogenesis of bone including ossification.Bixaceae: A plant family of the order Violales, subclass Dilleniidae, class Magnoliopsida. Bixa contains bixin. Cochlospermum contains arjunolic acid and gum kondagogu (POLYSACCHARIDES).Wettability: 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.Polyglactin 910: A polyester used for absorbable sutures & surgical mesh, especially in ophthalmic surgery. 2-Hydroxy-propanoic acid polymer with polymerized hydroxyacetic acid, which forms 3,6-dimethyl-1,4-dioxane-dione polymer with 1,4-dioxane-2,5-dione copolymer of molecular weight about 80,000 daltons.Excipients: Usually inert substances added to a prescription in order to provide suitable consistency to the dosage form. These include binders, matrix, base or diluent in pills, tablets, creams, salves, etc.Dental Casting Technique: The process of producing a form or impression made of metal or plaster using a mold.Hydrogel: A network of cross-linked hydrophilic macromolecules used in biomedical applications.Tantalum: Tantalum. A rare metallic element, atomic number 73, atomic weight 180.948, symbol Ta. It is a noncorrosive and malleable metal that has been used for plates or disks to replace cranial defects, for wire sutures, and for making prosthetic devices. (Dorland, 28th ed)Vacuum: A space in which the pressure is far below atmospheric pressure so that the remaining gases do not affect processes being carried on in the space.Elasticity: Resistance and recovery from distortion of shape.Technology, Pharmaceutical: The application of scientific knowledge or technology to pharmacy and the pharmaceutical industry. It includes methods, techniques, and instrumentation in the manufacture, preparation, compounding, dispensing, packaging, and storing of drugs and other preparations used in diagnostic and determinative procedures, and in the treatment of patients.Hibernation: The dormant state in which some warm-blooded animal species pass the winter. It is characterized by narcosis and by sharp reduction in body temperature and metabolic activity and by a depression of vital signs.Numerical Analysis, Computer-Assisted: Computer-assisted study of methods for obtaining useful quantitative solutions to problems that have been expressed mathematically.Polymethyl Methacrylate: 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.Absorbable Implants: 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.Ilium: The largest of three bones that make up each half of the pelvic girdle.Calcification, Physiologic: Process by which organic tissue becomes hardened by the physiologic deposit of calcium salts.Silicon: 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].Glass: 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.West VirginiaGuided Tissue Regeneration: Procedures for enhancing and directing tissue repair and renewal processes, such as BONE REGENERATION; NERVE REGENERATION; etc. They involve surgically implanting growth conducive tracks or conduits (TISSUE SCAFFOLDING) at the damaged site to stimulate and control the location of cell repopulation. The tracks or conduits are made from synthetic and/or natural materials and may include support cells and induction factors for CELL GROWTH PROCESSES; or CELL MIGRATION.Delayed-Action Preparations: Dosage forms of a drug that act over a period of time by controlled-release processes or technology.Povidone: A polyvinyl polymer of variable molecular weight; used as suspending and dispersing agent and vehicle for pharmaceuticals; also used as blood volume expander.Gelatin: A product formed from skin, white connective tissue, or bone COLLAGEN. It is used as a protein food adjuvant, plasma substitute, hemostatic, suspending agent in pharmaceutical preparations, and in the manufacturing of capsules and suppositories.Tablets, Enteric-Coated: Tablets coated with material that delays release of the medication until after they leave the stomach. (Dorland, 28th ed)
Porosity and slag inclusion of the finished weld is reduced, as electrode positioning is consistent and accurate. The process ... As the electrode position is also constant relative to the weld, the risk of porosity is also reduced, to the level of a ...
Accurate wavelet estimation requires the accurate tie of the impedance log to the seismic. Errors in well tie can result in ... In many geological environments acoustic impedance has a strong relationship to petrophysical properties such as porosity, ... This requires accurate p-sonic, s-sonic and density logs tied to the appropriate events on the seismic data. Wavelets are ... Accurate wavelet estimation is critical to the success of any seismic inversion. The inferred shape of the seismic wavelet may ...
Another source is americium berylium (Am-Be) neutron source used in evaluation of the porosity of the formation, and this has ... The attenuation of these gamma rays gives an accurate measure of formation density; this has been a standard oilfield tool ...
Porosity of subsurface soil is lower than in surface soil due to compaction by gravity. Porosity of 0.20 is considered normal ... but not all soils lend themselves to accurate field determinations of soil texture. The mineral texture can be obfuscated by ... Soil porosity is complex. Traditional models regard porosity as continuous. This fails to account for anomalous features and ... Porosity of topsoil is a measure of the pore space in soil which typically decreases as grain size increases. This is due to ...
... frequently create more accurate forecasts while also avoiding porosity problems. Developed by Andrew Coles,PhD, Gen-4 curves ... The curves can also address price porosity and price suspension problems associated with rapidly changing volume conditions. ... are two drawbacks in the timing of asset price moves in MIDAS technical analysis centering on the problems of price porosity ...
... provide oil and gas companies with comprehensive and accurate measurements of reservoir rock properties including porosity, ...
For the best-fit "snowman" model, the density is found to be 1.8 ± 0.2 g/cm³, giving a porosity on the order of 20%, and ... Observation of the satellite's orbit has made possible an accurate determination of Hermione's mass. ...
Phao Dam wares were prized for durability and lack of porosity. Most notable of these products are the once ubiquitous Dan ... may not be accurate. Prior to approximately 1972 nearly all the products of Dan Kwian kilns were functional vessels. Common ...
A main complication in deriving an accurate porosity in the presence of shallow invasion comes from the fact that the neutron ... Gas porosity is the fraction of a rock or sediment filled with a gas. Determining the true porosity of a gas filled formation ... Thus, for a certain range of depths of invasion, accurate determination of formation porosity becomes very difficult. Without ... The process of estimating the true porosity in the gas region relies on the appropriate use of the two porosity logs. The ...
This method is fast, reproducible and accurate, and can be used "on-line" on the cast shop floor. The amount of H2 in the gas ... Hydrogen gas porosity is an aluminium casting defect under the form of a porosity or void in an aluminium casting caused by a ... Hydrogen causes porosity in aluminum products leading to many casting defects, reduced mechanical properties like fatigue and ... Aluminum smelters and aluminum foundries want to produce high quality aluminum and shape castings with minimum porosity. This ...
Correction parameters for lithology, borehole parameters, and others are necessary for accurate porosity determination as ... a neutron log will show a low porosity value. This characteristic allows a neutron porosity log to be used with other porosity ... Neutron temperature Effective porosity Gas porosity John T. Dewan, "Open-Hole Nuclear Logging - State of the Art" - SPWLA ... Determination of porosity is one of the most important uses of neutron porosity log. ...
Modeling the Effect of Porosity on the Elastic Properties of Synthetic Graphite Using CT Scans and the Finite Element Method. ... The app has applications in aerospace, automotive and other fields needing to generate accurate 3D models from scans. Other ... Measurements can be taken, for example, of fractures and cracks, and statistics generated for porosity distribution and other ... The characterisation and modelling of manufacturing porosity of a 2-D carbon/carbon composite. Journal of Composite Materials. ...
Reliable reservoir performance predictions of EGS systems require accurate and robust modeling for the coupled thermal- ... and Carmen-Kozeny porosity-permeability relationship. RELAP-7 is the next-generation tool in the RELAP safety/systems analysis ... including thermal conductivity and porosity. Once the bulk properties have been calculated, they can be passed to BISON for a ...
Directional drillers rely on receiving accurate, quality tested data from the MWD operator to allow them to keep the well ... porosity, pressure or other data, are connected, physically and digitally, to a logic unit which converts the information into ... Density and porosity, rock fluid pressures and other measurements are taken, some using radioactive sources, some using sound, ... porosity, resistivity, acoustic-caliper, inclination at the drill bit (NBI), magnetic resonance and formation pressure.[ ...
Volume calibration of the total porosity and pore-size can be good, just involving ratioing the NMR signal amplitude at a ... The melting event was then previously expected to provide more accurate information on the pore body. However, a new melting ... NMRC is a recent technique (originated in 1993) for measuring total porosity and pore size distributions. It makes use of the ... Therefore, the melting event will not give accurate information on the pore body. If the incorrect melting mechanism is assumed ...
Compaction reduces the porosity and the pore sizes. Surface cover increases capacity by retarding runoff, reducing compaction ... With adoption of a more scientific approach, Leonardo da Vinci and Bernard Palissy independently reached an accurate ... rain gauge for routine accurate measurements of rain and snowfall; satellite for rainy area identification, rain rate ...
Other possible defects are gas porosity, shrinkage porosity, hot tears, and flow marks. Flow marks are marks left on the ... The name is an acronym for accurate, reliable, and dense. It was developed to combine a stable fill and directional ... When no porosity is allowed in a cast part then the pore-free casting process is used. It is identical to the standard process ... This causes small dispersed oxides to form when the molten metal fills the die, which virtually eliminates gas porosity. An ...
Often the porosity or effective porosity is used as an upper bound to the specific yield. Typically Sy is orders of magnitude ... Accurate simulation of the aquifer system requires knowledge of the aquifer properties and boundary conditions. Therefore, a ... Porosity does not directly affect the distribution of hydraulic head in an aquifer, but it has a very strong effect on the ... Porosity (n) is a directly measurable aquifer property; it is a fraction between 0 and 1 indicating the amount of pore space ...
The high porosity of the interior of Phobos (based on the density of 1.88 g/cm3, voids are estimated to comprise 25 to 35 ... and accurate measurements of the orbit available by 1969 showed that the discrepancy did not exist. Singer's critique was ... The porosity of Phobos was calculated to be 30% ± 5%, or a quarter to a third being empty. Phobos has been photographed in ... Phobos's density is too low to be solid rock, and it is known to have significant porosity. These results led to the suggestion ...
The theory proved to be both accurate and highly versatile, encompassing mixtures containing non-polar, associating and chain ... and coworkers is now universally used in analysing adsorption isotherms to calculate pore size distributions and porosity of ...
If the mineral grain density is chosen to be 3100 kg m−3, 10% to 23% porosity could give a 200 kg m−3 drop in the bulk density ... Accurate modeling is thus required to eliminate the offset. Such work is still ongoing. Many researchers have outlined the ... Precise tracking of spacecrafts is of prime importance for accurate gravity modeling, as gravity models are developed from ... To achieve the bulk value, porosity could play an important role. ...
The use is accurate as only qualitative considerations are needed. It is fast enough to respond to the monument's immediate ... SfM has been also successfully applied for the assessment of large wood accumulation volume[27] and porosity[28] in fluvial ... This is known as motion parallax, and from this depth information can be used to generate an accurate 3D representation of the ... management needs.[31] The first operational phase is an accurate preparation of the photogrammetric surveying where is ...
Swamy R.N 1986) points out that the compressive strength is not very accurate parameter to study the severity of ASR; however, ... The moist NaOH impregnates the surface and the porosity of calcium hydroxide grains with a high specific surface area. Soda ... it first expands and occupies the free porosity. When this latter is completely filled, if the soluble but very viscous gel ... and to decrease the porosity of the hardened cement paste by the formation of calcium silicate hydrates (C-S-H). However, ...
Due to porosity problems in ferritic steels and limited benefits, however, it is not a popular shielding gas additive.[31] ... When welding dissimilar metals, the joint must have an accurate fit, with proper gap dimensions and bevel angles. Care should ... For GTAW of carbon and stainless steels, the selection of a filler material is important to prevent excessive porosity. Oxides ... Additionally, if the welding torch is too far from the workpiece the shielding gas becomes ineffective, causing porosity within ...
Remote sensing by satellite also reduces jittering as the sensor is held stable in space and gives accurate data in the absence ... The change in lithology may suggest soft rock and unconsolidated sediments, where porosity is high. The surficial vegetation ... Feasible resources explorations should be backed up by accurate geological models to locate prospect ore and petroleum deposits ... example is using short wavelength region in VNIR to estimate the petroleum reservoir because VNIR can provide both accurate ...
The final color of each strand of hair will depend on its original color and porosity. Because hair's color and porosity across ... risk and the interpretation by lay people may not be sufficiently accurate.[16] ... Porosity of hair can affect the final shade. Porous hair often absorbs more color, which sometimes results darker than expected ...
Conversely, permeability and porosity are observed to increase when net ... Permeability and porosity decrease with increasing net stress in consolidated and unconsolidated porous media is a well-known ... A rapid accurate unsteady-state Klinkenberg permeameter. Society of Petroleum Engineers Journal, 12 (05), pp. 383&-397. ... Regional variations of porosity and cement: St. Peter and Mount Simon sandstones in Illinois Basin. AAPG Bulletin, 68 (6), pp. ...
... complemented by the Ga+ FIB method which is now frequently used to characterise porosity and organic/inorganic phases, together ... Accurate pore quantification depends on both the fields of view and the spatial resolutions of 3D images. A single imaging ... Hierarchical integration of porosity in shales. *Lin Ma. ORCID: orcid.org/0000-0003-2072-84801,2. , ... A) Porosity-associated phases and corresponding pore types. (B,C) Pore size distribution displayed respectively by number ...
The Usage of Genetic Methods for Prediction of Fabric Porosity , IntechOpen, Published on: 2012-10-18. Authors: Polona Dobnik ... We used an optical method to measure porosity parameters of woven fabrics, since it is the most accurate technique for macro- ... Hence, if porosity is estimated or predicted then when developing a new product the desired porosity parameters can be set in ... 2. Porosity and porosity parameters. Flat textile materials, e.g. fabrics, are porous materials which allow the transmission of ...
DENTURE ACRYLIC RESINS EASY FLOW DENTURE ACRYLIC • High impact • Cross linked • Color stable • Porosity-free curing • Easy ... mixing • Microwavable • Long dough time • Dimensionally accurate • Consistent particle size • Color matched to self-cure • High ...
It is found that the new method is accurate and reliable for all test cases, whereas the Braces and Cuis approaches may cause ... Impacts of the Porosity-Permeability Transform Throughout the Reservoir Modeling Workflow conference, April 2013 * Roadifer, R ... It is found that the new method is accurate and reliable for all test cases, whereas the Braces and Cuis approaches may cause ... Permeability and porosity are retained as functions so that the developed expressions are functionalmore » derivative ...
An accurate solidification analysis can predict the occurrence, location and size of internal defects. ... WHAT IS SHRINKAGE POROSITY The term porosity is generally used to describe cavities produced within a solidified casting, due ... If the shrinkage porosity is small in diameter and limited to the very centre of thick sections it wont cause massive problems ... THE FUNDAMENTAL CAUSE OF SHRINKAGE POROSITY HAS TO DO WITH THE SOLIDIFICATION PHASE, LETS DIVE INTO THE MEANING OF THAT ...
A main complication in deriving an accurate porosity in the presence of shallow invasion comes from the fact that the neutron ... Gas porosity is the fraction of a rock or sediment filled with a gas. Determining the true porosity of a gas filled formation ... Thus, for a certain range of depths of invasion, accurate determination of formation porosity becomes very difficult. Without ... The process of estimating the true porosity in the gas region relies on the appropriate use of the two porosity logs. The ...
Density and porosity analysis. The Accupyc 1340 uses an inert gas as the displacement medium in order to obtain the true, ... Density calculations using the gas displacement method are much more accurate and reproducible than the traditional Archimedes ... Aerogel technology provides high added-value lightweight materials with outstanding surface area and open porosity, susceptible ...
This method is fast, reproducible and accurate, and can be used "on-line" on the cast shop floor. The amount of H2 in the gas ... Hydrogen gas porosity is an aluminium casting defect under the form of a porosity or void in an aluminium casting caused by a ... Hydrogen causes porosity in aluminum products leading to many casting defects, reduced mechanical properties like fatigue and ... Aluminum smelters and aluminum foundries want to produce high quality aluminum and shape castings with minimum porosity. This ...
Parameter study shows that (1) the nonlinear resistance law provides more accurate results; (2) particle size and porosity have ... 2 more authors) (2017) Multiphase SPH modeling of free surface flow in porous media with variable porosity. Computers and ... This paper presents a numerical model for simulating free surface flow in porous media with spatially varying porosity. The ... Multiphase SPH modeling of free surface flow in porous media with variable porosity ...
Dimensionally accurate. *Color matched to self cure. *Cross linked. *Porosity-free curing ...
The accurate diagnosis and dynamic monitoring are fundamental for the prompt treatment. ... porosity and Youngs modulus), which has attracted increasing attentions. However, due to the immature understanding to the ...
"Adjusting porosity and permeability estimation by nuclear magnetic resonance: a case study from a carbonate reservoir of south ... Comparison of core and NMR porosity showed that NMR method is very accurate for estimation of porosity. However, after ... Comparison of core and NMR porosity showed that NMR method is very accurate for estimation of porosity. However, after ... NMR-obtained porosity showed that a good relationship Comparison of helium porosity and NMR porosity in coals is between the ...
Having a camera that is waterproof would allow them to make more accurate and detailed observations when examining how ... or observe how porosity and mass buoyancy. Students could learn about density, acceleration, displacement and so much more with ...
The floating behaviour of the low density drug delivery system could successfully be combined with accurate control of drug ... Porosity. The word pore comes from the Greek word ποροσ, which means passage. This indicates the role of a pore acting as a ... Porosity is the collective term for these pores and their distribution in the structure of the solid. Based on the pore size ... Porosity and sorption behaviour. http:// www.staff.ncl. ac.uk/a.j.fletcher /adsorption.htm (3rd Oct 2008) ...
I also aim to determine an accurate understanding of the estimates of Hg stored in permafrost. Schuster. ... such as porosity values, (3) relate the log character of fractures to their hydraulic conductivities, (4) develop the ... The development of quantitative log-interpretation techniques to derive more accurate data and to evaluate the statistical ... Design of the desired simulation models depends in large measure upon accurate mathematical/numerical representation of the ...
Porosity is determined by measuring the volume of the mercury infused. In addition to an overall percentage of porosity for the ... allowing for more accurate characterization of the scaffold geometry. ... Porosity is a result of the imperfect packing of spherical microcarriers inside the mold, and thus geometry dictates that there ... The porosity and pore size distribution of typical microcarrier scaffolds was measured using mercury porosimetry. Although the ...
2 and 3 are more accurate depictions of the microstructure of a product produced by the inventive process. ... For example, by forming a tube having porosity at an inner surface 66 (FIG. 5B) which is smaller than the porosity at an outer ... Thus, the relative porosity varies, from the inside to the outside, in a sense opposite to that of the tube structure produced ... Yet another object of the invention is to provide a porous article having a porosity which is variable in the direction of the ...
List of available Mini MicroFilter Capsules with Porosity of 2 µm. Porosity. Swept Volume. Material. Frit Material. Colour. ... Our Mini MicroFilter Assembly offers internal volumes low enough to deliver accurate chromatographic results. ... Porosity. Swept Volume. Material. Frit Material. Colour. Option for Pack. 1 µm. 10 nL. PEEK/Stainless Steel. Stainless Steel ... List of available Mini MicroFilter Capsules with Porosity of 1 µm. Swept Volume. Material. Frit Material. Colour. Option for ...
... more accurate seismic interpretation was completed to better delineate the internal and external structure of the reefs. The ... the bottom zone has low porosity and the upper zone has high porosity that was targeted in previous well completion schemes. ... An Integrated Approach in Characterization of Triple Porosity Nisku Reefs Alberta: A Quest from Core and Borehole Images to 3D ... With the framework of the geomodel developed, rock type, porosity, permeability and water saturation were interpolated within ...
Accurate dual-porosity modeling of CO2 storage in fractured reservoirs. SPE Reservoir Simulation Conference, 20-22 February ... The application of dual porosity flow diagnostics to a fractured carbonate field. ECMOR XVI 2018 - 16th European Conference on ... Towards a nonlinear transfer function in dual porosity models. Conference Proceedings, 82nd EAGE Annual Conference & Exhibition ...
Data from wells alone have limitations and they are not enough to produce an accurate view of the reservoir. Geostatistics ... The first porosity model was generated based on porosity logs from wells only. The other three porosity models were generated ... The results of this study showed that facies-based porosity models yield better definition of porosity in vertical and lateral ... Porosity from the wells-only model has the lowest accuracy compared to the other models, which shows the importance of ...
East Providence, RI) is a brush-on methacrylate compound formulated for sealing porosity in welds that will contain gases under ... The machine uses a non-contact vibration sensor thats so accurate, it not only tells you which gear has the problem, but which ... Stop Porosity, Leaks. WeldSeal from IMPCO Inc. (East Providence, RI) is a brush-on methacrylate compound formulated for sealing ... WeldSeal from IMPCO Inc.(East Providence, RI) is a brush-on methacrylate compound formulated for sealing porosity in welds that ...
If available, not the porosity in its accurate sample. The checkout between condition and request combines visited an ... search 5 porosity by ExamplePosted on July good, cosmic Android 5 Programming by Example, line and find GUI icing efficiency to ... and nt the groundbreaking accurate action to Georgia. These Terms from the Congo download Rhythm, Illusion and the developed ...
The nonvisible nature and lack of radiographic appearance of FDOJ make it difficult to obtain an accurate diagnosis [13]. ... TAU precisely images and identifies cavitational porosity in the jawbone. Studies show that, in 84% of cases, FDOJ lesions on ...
  • Towards a nonlinear transfer function in dual porosity models. (sintef.no)
  • The proposed concept could further be extended to develop solutions for the dual-porosity continuum. (onepetro.org)
  • The behaviors of both fractured-vuggy and fractal reservoirs cannot be explained by the conventional dual-porosity model. (spegcs.org)
  • In contrast, he says, 'The Advanta implant (ePTFE, Atrium Medical Corp.) was designed with a dual porosity - its innermost core measures 100 μ, which makes it very soft. (dermatologytimes.com)
  • During the calibration process, water-filled formations are used to develop porosity algorithms, and under these conditions, a lower number of hydrogen atoms is equivalent to a lower porosity. (wikipedia.org)
  • The increase in the amount of water in the near formation, i.e., the increase in the number of electrons, is interpreted by the density tool algorithm as a higher density which translates into a lower porosity estimate. (wikipedia.org)
  • The tendency of CAM plants toward a higher cell volume fraction (i.e. lower porosity) enables greater nighttime storage of CO 2 as malic acid in vacuoles, which is then decarboxylated and released as CO 2 when stomata are closed during the light period ( Nelson and Sage, 2008 ). (plantphysiol.org)
  • Compressive moduli of the scaffolds were also measured and showed that lower porosity yielded greater modulus of the scaffolds. (pubmedcentralcanada.ca)
  • While previous studies accounted for leaf-level variation in porosity and mesophyll thickness, they omitted 3D IAS traits that potentially influence IAS conductance (g IAS ). (plantphysiol.org)
  • Increased bone turnover also results in increased cortical porosity and decreased cortical thickness. (galileo-training.com)
  • Then the Water-saturationa nd porosity distributions of areservoir physical model with thickness less than 5cm can be determinedby means of these eurves. (cnki.net)
  • One of its main strengths is its industry leading Inversion Modelling capabilities which can transform vintage, low-resolution resistivity curves into accurate, high resolution, formation resistivity data (Rt). (lr.org)
  • In order to optimize their design efforts, battery developers rely on accurate physical property characterization for battery components such as the anode, cathode, or separator. (anton-paar.com)
  • In die casting processes, the mould filling phase is highly critical because defects such as air entrapment and shrinkage porosity might occur. (comunicati.net)
  • To predict shrinkage porosity and other defects, simulation has been increasingly used nowadays, as these software require less development cost and time than experiments. (comunicati.net)
  • An accurate solidification analysis can predict the occurrence, location and size of internal defects. (comunicati.net)
  • The camera captures defects such as misalignment, unsatisfactory weld penetration and porosity. (allseas.com)
  • Nikon XT H 225/320 Microfocus CT scanner examines parts with approximate working volume of Ø 0.3m by 0.6m height for non-destructive investigation, flaw detection, porosity calculation, digital volume correlation, dimensional measurement and reverse engineering. (warwick.ac.uk)
  • Most of the main fields around the world produce from naturally fractured vuggy reservoirs, in which matrix, fracture network, and high vuggy porosity are usually present. (spegcs.org)
  • With a large selection of gas sorption analyzers, along with mercury intrusion instruments, Micromeritics offers a product to fufill almost any need for porosity determinations. (micromeritics.com)
  • With the enhanced resolution of a reprocessed 3D seismic volume, more accurate seismic interpretation was completed to better delineate the internal and external structure of the reefs. (onepetro.org)
  • Here, we describe a methodology that allows to obtain accurate 1-D and 3-D attenuation models from seismic active data. (frontiersin.org)
  • The term porosity is generally used to describe cavities produced within a solidified casting, due to specific volume contraction on solidification. (comunicati.net)
  • Usually the ragged edged cavities are associated with the last areas to solidify in contrast to the smooth rounded voids resulting from gas porosity. (comunicati.net)
  • In contrast, peripheral quantitative computed tomography (pQCT) estimates volumetric BMD (vBMD, g/cm(3)), distinguishes between cortical and trabecular bone, and provides accurate estimates of cortical dimensions. (galileo-training.com)
  • Density calculations using the gas displacement method are much more accurate and reproducible than the traditional Archimedes water displacement method. (empa.ch)
  • Having a camera that is waterproof would allow them to make more accurate and detailed observations when examining how different objects react in water. (oercommons.org)
  • When the invasion front is greater than 12 inches (30 cm), both tools see only water-filled formations and the two porosity estimates agree and read true porosity. (wikipedia.org)
  • A base layer of water-permeable concrete is paved by spreading and pounding a sand filter layer and a rubble base layer on the consolidated ground to have porosity after pounding of 10-20% and a coefficient of water permeability of more than 10.times.10.sup. (patents.com)
  • Compared to the available analytical models, this approach can be employed to glean more accurate attributes of the hydraulically fractured horizontal well. (onepetro.org)
  • The paper presents an efficient and accurate computational approach based on the Boundary Element Method for simulating the level of protection against corrosion of the pipeline as well as current densities and electric potential in different points of the soil. (witpress.com)
  • the bottom zone has low porosity and the upper zone has high porosity that was targeted in previous well completion schemes. (onepetro.org)
  • The most accurate analysis of processes and material behaviors comes from 3 D high-speed X-imaging and diffraction techniques. (anl.gov)
  • 15 Due to the limited amount of porogen that can be incorporated, it is often difficult to achieve high porosity to induce tissue ingrowth and minimize diffusion limitations for certain type of polymers such as injectable polymers. (pubmedcentralcanada.ca)
  • 2 . The skin treatment kit of claim 1 , wherein said applicator is formed of a foam having a porosity ranging from 65 pores per inch to 120 pores per inch. (google.es)
  • Log interpreters often find it difficult to accurately estimate the true formation porosity from these two curves. (wikipedia.org)
  • The compaction values obtained with the alternative methods are similar to those resulting with the lower-limit curves of the porosity-depth change method. (ua.es)
  • In this geological structure, indeed, fluids play a key role in controlling and governing the evolution of magmatic processes, so their accurate identification and tracking is crucial. (frontiersin.org)
  • As expected, microscopic analysis revealed that mechanical performance was closely tied to porosity variations in samples, with little or no variation in microstructure observed through parameter variation. (whiterose.ac.uk)
  • The apparatus of the invention includes a fact-acting valve such that immediately after calculation of the permeability of the sample under defined conditions, a precise value of the porosity of the same sample may be computed from the transient pressure change that is observed after cutting off air flow into the sample from the probe. (freepatentsonline.com)
  • This is due to the use of the facies model as constraint for porosity distribution. (edu.sa)
  • Porosity from the wells-only model has the lowest accuracy compared to the other models, which shows the importance of introducing other type of data in porosity modeling. (edu.sa)
  • Porosity distribution calculated from the dry and wet scans was used to build a rectangular model with the cylindrical core inscribed inside. (onepetro.org)
  • The productivity predicting model is verified via an analytical ternary-porosity model. (hindawi.com)
  • Analytical flow models such as triple-linear model [ 1 , 2 ] and ternary-porosity model [ 3 ] were built to simulate productivity of fractured horizontal well. (hindawi.com)
  • In addition, the vertically stratified nature of the soil needs to be considered in the model, in order to obtain more accurate representation of the environment. (witpress.com)
  • Most methods for calculating compaction are based on empirically derived porosity-depth relationships from a variety of known sediment types. (ua.es)
  • WeldSeal from IMPCO Inc. (East Providence, RI) is a brush-on methacrylate compound formulated for sealing porosity in welds that will contain gases under pressure, or liquids. (impomag.com)
  • Porosity influences the physical exchanges and chemical reactivity of solids with gases and liquids. (micromeritics.com)
  • The change of state of the solid solution in each region is readily detectable visually by an indicator system which is intimately associated with the solid solution in said regions in order to permit rapid and accurate visual determination of the temperature of the test subject. (google.com)