AnatomyOrganismsChemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentPhenomena and ProcessesDisciplines and OccupationsAnthropology, Education, Sociology and Social PhenomenaTechnology, Industry, AgricultureInformation ScienceHealth CareGeographicals
Shear StrengthMaterials TestingDental BondingOsseointegrationStress, MechanicalDental Stress AnalysisBone CementsSurface PropertiesMuscle StrengthTensile StrengthHand StrengthCompressive StrengthHemorheologyResin CementsMuscle Strength DynamometerFrictionLubricationPolymersPressureAdhesivesLeuconostocaceaeRutinGene Expression Regulation, BacterialBacterial ProteinsPortugalBibliometricsSan FranciscoNew MexicoArgonOrthodontic BracketsLaser TherapyNational Academy of Sciences (U.S.)LouisianaBentonitePhotoelectron SpectroscopyResearch ReportInstitute of Medicine (U.S.)Dental Atraumatic Restorative TreatmentGlass Ionomer CementsDentinDental EnamelNanotubes, CarbonNanostructuresNanotubesNanotechnologyAccess to InformationNanocompositesAcid Etching, DentalDentin-Bonding AgentsMembrane FluidityCell AdhesionAcaciaCell MovementFibronectins
Shear Strength: 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.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.Dental Bonding: 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.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).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.Dental Stress Analysis: 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.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.Surface Properties: Characteristics or attributes of the outer boundaries of objects, including molecules.Muscle Strength: The amount of force generated by MUSCLE CONTRACTION. Muscle strength can be measured during isometric, isotonic, or isokinetic contraction, either manually or using a device such as a MUSCLE STRENGTH DYNAMOMETER.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)Hand Strength: Force exerted when gripping or grasping.Compressive Strength: The maximum compression a material can withstand without failure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p427)Hemorheology: The deformation and flow behavior of BLOOD and its elements i.e., PLASMA; ERYTHROCYTES; WHITE BLOOD CELLS; and BLOOD PLATELETS.Resin Cements: 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)Muscle Strength Dynamometer: A device that measures MUSCLE STRENGTH during muscle contraction, such as gripping, pushing, and pulling. It is used to evaluate the health status of muscle in sports medicine or physical therapy.Friction: Surface resistance to the relative motion of one body against the rubbing, sliding, rolling, or flowing of another with which it is in contact.Lubrication: The application of LUBRICANTS to diminish FRICTION between two surfaces.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).Pressure: A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Adhesives: Substances that cause the adherence of two surfaces. They include glues (properly collagen-derived adhesives), mucilages, sticky pastes, gums, resins, or latex.Leuconostocaceae: A family of gram-positive bacteria in the order Lactobacillales. Lactic acid is the main product of their carbohydrate metabolism.Rutin: A flavonol glycoside found in many plants, including BUCKWHEAT; TOBACCO; FORSYTHIA; HYDRANGEA; VIOLA, etc. It has been used therapeutically to decrease capillary fragility.Gene Expression Regulation, Bacterial: Any of the processes by which cytoplasmic or intercellular factors influence the differential control of gene action in bacteria.Bacterial Proteins: Proteins found in any species of bacterium.PortugalBibliometrics: The use of statistical methods in the analysis of a body of literature to reveal the historical development of subject fields and patterns of authorship, publication, and use. Formerly called statistical bibliography. (from The ALA Glossary of Library and Information Science, 1983)San FranciscoNew MexicoArgon: Argon. A noble gas with the atomic symbol Ar, atomic number 18, and atomic weight 39.948. It is used in fluorescent tubes and wherever an inert atmosphere is desired and nitrogen cannot be used.Orthodontic Brackets: Small metal or ceramic attachments used to fasten an arch wire. These attachments are soldered or welded to an orthodontic band or cemented directly onto the teeth. Bowles brackets, edgewise brackets, multiphase brackets, ribbon arch brackets, twin-wire brackets, and universal brackets are all types of orthodontic brackets.Laser Therapy: The use of photothermal effects of LASERS to coagulate, incise, vaporize, resect, dissect, or resurface tissue.National Academy of Sciences (U.S.): A United States organization of distinguished scientists and engineers established for the purpose of investigating and reporting upon any subject of art or science as requested by any department of government. The National Research Council organized by NAS serves as the principal operating agency to stimulate and support research.LouisianaBentonite: A colloidal, hydrated aluminum silicate that swells 12 times its dry size when added to water.Photoelectron Spectroscopy: 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.Research Report: Detailed account or statement or formal record of data resulting from empirical inquiry.Institute of Medicine (U.S.): Identifies, for study and analysis, important issues and problems that relate to health and medicine. The Institute initiates and conducts studies of national policy and planning for health care and health-related education and research; it also responds to requests from the federal government and other agencies for studies and advice.Dental Atraumatic Restorative Treatment: Treatment modality for DENTAL CARIES that uses manual excavation method and GLASS IONOMER CEMENTS. Because of its noninvasiveness and no need for expensive equipment and anesthesia it is promoted as an approach in places where dental care is not readily available.Glass Ionomer Cements: 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.Dentin: 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)Dental Enamel: 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)Nanotubes, Carbon: 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.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.Nanotubes: Nanometer-sized tubes composed of various substances including carbon (CARBON NANOTUBES), boron nitride, or nickel vanadate.Nanotechnology: The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.Access to Information: Individual's rights to obtain and use information collected or generated by others.Nanocomposites: Nanometer-scale composite structures composed of organic molecules intimately incorporated with inorganic molecules. (Glossary of Biotechnology and Nanobiotechology Terms, 4th ed)Acid Etching, Dental: Preparation of TOOTH surfaces and DENTAL MATERIALS with etching agents, usually phosphoric acid, to roughen the surface to increase adhesion or osteointegration.Dentin-Bonding Agents: 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.Membrane Fluidity: The motion of phospholipid molecules within the lipid bilayer, dependent on the classes of phospholipids present, their fatty acid composition and degree of unsaturation of the acyl chains, the cholesterol concentration, and temperature.Cell Adhesion: Adherence of cells to surfaces or to other cells.Acacia: A plant genus of the family FABACEAE. The gums and tanning agents obtained from Acacia are called GUM ARABIC. The common name of catechu is more often used for Areca catechu (ARECA).Cell Movement: The movement of cells from one location to another. Distinguish from CYTOKINESIS which is the process of dividing the CYTOPLASM of a cell.Fibronectins: Glycoproteins found on the surfaces of cells, particularly in fibrillar structures. The proteins are lost or reduced when these cells undergo viral or chemical transformation. They are highly susceptible to proteolysis and are substrates for activated blood coagulation factor VIII. The forms present in plasma are called cold-insoluble globulins.

Bacterial swimming strategies and turbulence. (1/1135)

Most bacteria in the ocean can be motile. Chemotaxis allows bacteria to detect nutrient gradients, and hence motility is believed to serve as a method of approaching sources of food. This picture is well established in a stagnant environment. In the ocean a shear microenvironment is associated with turbulence. This shear flow prevents clustering of bacteria around local nutrient sources if they swim in the commonly assumed "run-and-tumble" strategy. Recent observations, however, indicate a "back-and-forth" swimming behavior for marine bacteria. In a theoretical study we compare the two bacterial swimming strategies in a realistic ocean environment. The "back-and-forth" strategy is found to enable the bacteria to stay close to a nutrient source even under high shear. Furthermore, rotational diffusion driven by thermal noise can significantly enhance the efficiency of this strategy. The superiority of the "back-and-forth" strategy suggests that bacterial motility has a control function rather than an approach function under turbulent conditions.  (+info)

In vitro characterization and micromechanics of tumor cell chemotactic protrusion, locomotion, and extravasation. (2/1135)

The objective of this paper is to introduce some novel in vitro applications in characterizing human melanoma cell protrusion and migration in response to soluble extracellular matrix protein stimulation. Specifically, we describe two assay systems: (1) dual-micropipette manipulation and (2) flow-migration chamber. Applications of the dual-micropipet technique provided kinetic measure of cell movement, cyclic pseudopod protrusion, and subsequent cell locomotion governed by chemotactic molecular transport dynamics. Chemotactic concentration gradient was found to influence significantly pseudopod protrusion frequency and locomotion speed, but not the protrusion extension. To further characterize active tumor cell extravasation, a process that involves dynamic tumor cell adhesion to vascular endothelium under flow conditions and subsequent transendothelial migration in response to chemotactic signals from the interstitial space, we developed a flow-migration chemotaxis system. This assay enabled characterization of tumor cell transcellular migration in terms of chemotactic signal gradients, shear forces, and cell-substrate adhesion. Results suggest that shear flow plays significant roles in tumor cell extravasation that is regulated by both tumor cell motility and tumor cell adhesion to endothelial molecules in a cooperative process.  (+info)

Fluid shear stress remodels expression and function of junctional proteins in cultured bone cells. (3/1135)

We tested the hypothesis that fluid shear stress (tau) modifies the expression, function, and distribution of junctional proteins [connexin (Cx)43, Cx45, and zona occludens (ZO)-1] in cultured bone cells. Cell lines with osteoblastic (MC3T3-E1 cells) and osteocytic (MLO-Y4 cells) phenotypes were exposed to tau-values of 5 or 20 dyn/cm(2) for 1-3 h. Immunostaining indicated that at 5 dyn/cm(2), the distribution of Cx43, Cx45, and ZO-1 was moderately disrupted at cell membranes; at 20 dyn/cm(2), disruption was more severe. Intercellular coupling was significantly decreased at both shear stress levels. Western blots showed the downregulation of membrane-bound Cx43 and ZO-1 and the upregulation of cytosolic Cx43 and Cx45 at different levels of shear stress. Similarly, Northern blots revealed that expression of Cx43, Cx45, and ZO-1 was selectively up- and downregulated in response to different shear stress levels. These results indicate that in cultured bone cells, fluid shear stress disrupts junctional communication, rearranges junctional proteins, and determines de novo synthesis of specific connexins to an extent that depends on the magnitude of the shear stress. Such disconnection from the bone cell network may provide part of the signal whereby the disconnected cells or the remaining network initiate focal bone remodeling.  (+info)

Shear bond strength of a new dental adhesive used to bond brackets to unetched enamel. (4/1135)

The aims of the present study were to measure the shear bond strength of a new multipurpose dental adhesive, IntegraCem, for direct bonding of stainless steel and ceramic brackets to unetched enamel, and to determine the mode of bond failure. Both stainless steel and ceramic brackets (GAC) were bonded with IntegraCem to unetched extracted human premolars. After bonding, the teeth were either stored in a water bath at 37 degrees C for 3 days or passed 2500 thermocycles from 6 to 60 degrees C. Debonding was then performed with a shearing force using an Instron universal testing machine. The force was recorded at bond failure. The results showed that the shear bond strength achieved was between 6.7 and 10.8 megapascals (MPa). Bond failure occurred at the enamel-adhesive interface, enabling more efficient enamel clean up. The shear bond strengths measured suggest that IntegraCem adhesive may be effectively used in orthodontic treatment.  (+info)

Shear properties of passive ventricular myocardium. (5/1135)

We examined the shear properties of passive ventricular myocardium in six pig hearts. Samples (3 x 3 x 3 mm) were cut from adjacent regions of the lateral left ventricular midwall, with sides aligned with the principal material axes. Four cycles of sinusoidal simple shear (maximum shear displacements of 0.1-0.5) were applied separately to each specimen in two orthogonal directions. Resulting forces along the three axes were measured. Three specimens from each heart were tested in different orientations to cover all six modes of simple shear deformation. Passive myocardium has nonlinear viscoelastic shear properties with reproducible, directionally dependent softening as strain is increased. Shear properties were clearly anisotropic with respect to the three principal material directions: passive ventricular myocardium is least resistant to simple shear displacements imposed in the plane of the myocardial layers and most resistant to shear deformations that produce extension of the myocyte axis. Comparison of results for the six different shear modes suggests that simple shear deformation is resisted by elastic elements aligned with the microstructural axes of the tissue.  (+info)

Comparative analysis of various platelet glycoprotein IIb/IIIa antagonists on shear-induced platelet activation and adhesion. (6/1135)

Platelet accretion into arterial thrombus in stenotic arterial vessels involves shear-induced platelet activation and adhesion. The Cone and Plate(let) Analyzer (CPA) is designed to simulate such conditions in vitro under a rotating high shear rate in whole blood. In the present study, we evaluated various experimental conditions (including aspirin, temperature, and calcium concentration) and investigated the effects of small molecules along with peptide glycoprotein IIb/IIIa antagonists on platelet adhesion using the CPA system. Concentration-dependent effect of glycoprotein IIb/IIIa antagonists on shear-induced platelet adhesion showed marked differences in potencies: IC50 = 34, 35, 91, 438, and 606 nM for DPC802 (a specific glycoprotein IIb/IIIa antagonist), roxifiban, sibrafiban, lotrafiban, and orbofiban (free acid forms), respectively, and IC50 values of 43, 430, and 5781 nM for abciximab, tirofiban, and eptifibatide, respectively. Parallel study was also conducted to evaluate the effect of glycoprotein IIb/IIIa inhibitors using optical aggregometry. The potency of fibans in blocking shear-induced platelet adhesion correlated well with their binding affinity to the resting and activated glycoprotein IIb/IIIa receptors, as well as their "off-rates". Nevertheless, none of these fibans was able to effectively block shear-induced platelet adhesion at targeted clinical dosing regimens except for abciximab. These data suggest that glycoprotein IIb/IIIa antagonists that show similar efficacy in the inhibition of platelet aggregation in a static in vitro assay may differ substantially in a shear-based system of platelet adhesion. The clinical significance of this phenomenon awaits further investigation.  (+info)

Shear stress magnitude and directionality modulate growth factor gene expression in preconditioned vascular endothelial cells. (7/1135)

OBJECTIVE: The purpose of this study was to simultaneously monitor the transcriptional levels of 12 endothelial growth factor genes in response to alterations in wall shear stress (WSS) under conditions relevant to the development of intimal hyperplasia, a major cause of arterial bypass graft failure. METHODS: Human umbilical vein endothelial cells were preconditioned in vitro under steady flow (WSS, 15 dynes/cm(2)) for 24 hours before being subjected to WSS at 25 (Delta = +10), 15 (Delta = 0), 5 (Delta = -10), 2.5 (Delta = -12.5), and 0 (Delta = -15) dynes/cm(2) or low magnitude WSS reversal (-2.5 dynes/cm(2)) for 6 hours. A focused complementary DNA array was used to simultaneously measure messenger RNA expression levels for END1, endothelial nitric oxide synthase (NOS3), platelet-derived growth factor A, platelet-derived growth factor B (PDGFB), acidic fibroblast growth factor, basic fibroblast growth factor, transforming growth factor-alpha, transforming growth factor-beta, vascular endothelial growth factor, insulin-like growth factor-1, epidermal growth factor, and angiotensin converting enzyme. RESULTS: Preconditioning significantly (P <.05) increased the fold expression of NOS3 (4.1 +/- 1.4), basic fibroblast growth factor (3.90 +/- 1.16), vascular endothelial growth factor (3.39 +/- 1.04), and insulin-like growth factor-1 (2.8 +/- 0.7) but decreased END1 (0.47 +/- 0.05) and PDGFB (0.70 +/- 0.04) messenger RNA expression levels relative to no-flow controls, an effect that was sustained on removal from flow for 6 hours. Notably, the ratio of END1/NOS3 expression was diminished (0.11 +/- 0.03) relative to that of cells maintained in static culture. Although few differences in gene expression from baseline (15 dynes/cm(2)) were measured in cells exposed to either constant (Delta = 0) or step decreases (Delta = -10, -12.5, or -15 dynes/cm(2)) in WSS, marked changes were seen in the group exposed to a step increase in WSS (Delta = +10) or to WSS reversal. Low magnitude retrograde WSS evoked significant (P <.05) transcriptional changes in multiple genes, including elevated END1 (4.1 +/- 0.5), platelet-derived growth factor A (1.5 +/- 0.2), PDGFB (2.3 +/- 0.3), and transforming growth factor-beta (1.5 +/- 0.2) levels, but depressed NOS3 (0.60 +/- 0.17) levels, and a marked increase in END1/NOS3 (6.7 +/- 1.6) when compared with equal magnitude antegrade WSS (2.5 dynes/cm(2)). CONCLUSION: These results support the implementation of a preconditioning phase for in vitro WSS studies to establish a physiologic baseline. Our findings complement previous macroscale findings and are consistent with a cellular mechanism involving increased END1 and PDGFB levels, but decreased NOS3 levels, leading to intimal hyperplasia at regions of low magnitude reversing WSS.  (+info)

Microrheology of human lung epithelial cells measured by atomic force microscopy. (8/1135)

Lung epithelial cells are subjected to large cyclic forces from breathing. However, their response to dynamic stresses is poorly defined. We measured the complex shear modulus (G(*)(omega)) of human alveolar (A549) and bronchial (BEAS-2B) epithelial cells over three frequency decades (0.1-100 Hz) and at different loading forces (0.1-0.9 nN) with atomic force microscopy. G(*)(omega) was computed by correcting force-indentation oscillatory data for the tip-cell contact geometry and for the hydrodynamic viscous drag. Both cell types displayed similar viscoelastic properties. The storage modulus G'(omega) increased with frequency following a power law with exponent approximately 0.2. The loss modulus G"(omega) was approximately 2/3 lower and increased similarly to G'(omega) up to approximately 10 Hz, but exhibited a steeper rise at higher frequencies. The cells showed a weak force dependence of G'(omega) and G"(omega). G(*)(omega) conformed to the power-law model with a structural damping coefficient of approximately 0.3, indicating a coupling of elastic and dissipative processes within the cell. Power-law behavior implies a continuum distribution of stress relaxation time constants. This complex dynamics is consistent with the rheology of soft glassy materials close to a glass transition, thereby suggesting that structural disorder and metastability may be fundamental features of cell architecture.  (+info)

Effect of saliva on shear bond strength of an orthodontic adhesive used with moisture-insensitive and self-etching primers. -...Effect of saliva on shear bond strength of an orthodontic adhesive used with moisture-insensitive and self-etching primers. -...
The purpose of this study was to investigate the effect of saliva contamination on the shear bond strength of an orthodontic adhesive used with Transbond Moisture-Insensitive Primer (MIP, 3M Unitek, Monrovia, Calif) and Transbond Plus Self-Etching Primer (SEP, 3M Unitek). Hydrophobic Transbond XT primer (XT, 3M Unitek) was used as a control. A total of 162 extracted premolars were collected and divided equally into 9 groups of 18 teeth each, and brackets were bonded with Transbond XT adhesive (3M Unitek) under different experimental conditions: (1) control: etch/dry/XT, (2) etch/dry/MIP, (3) etch/dry/MIP/wet (saliva)/MIP, (4) etch/wet/MIP, (5) etch/wet/MIP/wet/MIP, (6) dry/SEP, (7) dry/SEP/wet/SEP, (8) wet/SEP, and (9) wet/SEP/wet/SEP. Shear bond strength of each sample was examined with a testing machine. The results showed that the control group had the highest mean shear bond strength (group 1, 21.3 +/- 6.8 MPa), followed by the MIP group in a dry field (group 2, 20.7 +/- 5.0 MPa). No significant
Shear bond strength of dentin bonding agents cured with a Plasma Arc curing lightShear bond strength of dentin bonding agents cured with a Plasma Arc curing light
The objective of this study was to compare dentin shear bond strength (DSBS) of dentin bonding agents (DBAs) cured with a plasma arc (PAC) light curing unit (LCU) and those cured with a light emitting diode (LED) LCU. Optical properties were also analyzed for Elipar freelight 2 (3M ESPE); LED LCU, Apollo 95E (DMT Systems); PAC LCU and VIP Junior (Bisco); Halogen LCU. The DBAs used for DSBS test were Scotchbond Multipurpose (3M ESPE), Singlebond 2 (3M ESPE) and Clearfil SE Bond (Kuraray). After DSBS testing, fractured specimens were analyzed for failure modes with SEM. The total irradiance and irradiance between 450 nm and 490 nm of the LCUs were different. LED LCU showed narrow spectral distribution around its peak at 462 nm whereas PAC and Halogen LCU showed a broad spectrum. There were no significant differences in mean shear bond strength among different LCUs (P > 0.05) but were significant differences among different DBAs (P < 0.001). ...
Converging parallel plate flow chambers for studies on the effect of the spatial gradient of wall shear stress on endothelial...Converging parallel plate flow chambers for studies on the effect of the spatial gradient of wall shear stress on endothelial...
Lu, Yiling and Li, Wei-Qi and Oraifige, I. and Wang, Wen (2014) Converging parallel plate flow chambers for studies on the effect of the spatial gradient of wall shear stress on endothelial cells. Journal of Biosciences and Medicines, 2. pp. 50-56. ISSN 2327-5081 ...
Comparative evaluation of shear bond strength of two nanofilled posterior composites as core build up materials: An in vitro...Comparative evaluation of shear bond strength of two nanofilled posterior composites as core build up materials: An in vitro...
TY - JOUR. T1 - Comparative evaluation of shear bond strength of two nanofilled posterior composites as core build up materials. T2 - An in vitro study. AU - Ganerhiwal, Shakshi. AU - Gupta, Chandni. AU - Kundabala, M.. AU - Ginjupalli, Kishore. AU - Shenoy, Ramya. PY - 2016/9/1. Y1 - 2016/9/1. N2 - Core build up is necessary as a foundation for post endodontic restorations when the tooth structure is severely damaged, fractured or extensively carious. Core build up material should provide resistance and retention form for the coronal restoration and possess sufficient strength to resist occlusal forces. An ideal core build-up material should have physical properties similar to those of tooth structure where the occlusal biting loads are transferred to dentin. The study evaluated and compared the shear bond strength of two nanofilled resin composites Group A - Filtek Z350 XT and Group B - Filtek Bulk fill) as core build up materials. Eighteen extracted permanent human molar teeth were sectioned ...
Реферат : Механические свойства элементов Периодической системы МенделееваРеферат : Механические свойства элементов Периодической системы Менделеева
trength) Fracture Toughness 10,6-12,3 MPa-mЅ KIC for hot-pressed structural grades Shear Modulus 135 GPa Shear Strength 345 MPa hot-pressed block Shear Strength 480 MPa cross-rolled sheet Boron (Crystalline) Knoop Microhardness 99,9% pure is 3300 (100 g load) 9,3 Mohs Tensile Strength, Ultimate 2,6-
Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models<...Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models<...
TY - JOUR. T1 - Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models. AU - Wang, Chaoyi. AU - Elsworth, Derek. AU - Fang, Yi. N1 - Funding Information: This work is a partial result of support provided by DOE grant DE‐FE0023354. This support is gratefully acknowledged. The manuscript benefitted from careful and insightful reviews by Carolina Giorgetti and Martijn van den Ende. This work utilizes data from literature that are cited in the main reference list; data from numerical modeling of this study are shown in the main text.. PY - 2019/1. Y1 - 2019/1. N2 - We conduct numerical shear experiments on mixtures of quartz and talc gouge using a three-dimensional (3D) distinct element model. A modified slip-weakening constitutive law is applied at contacts. We perform velocity-stepping experiments on both uniform and layered mixtures of quartz and talc analogs. We separately vary the proportion of talc in the uniform mixtures and ...
Rolling Shear Properties of some European Timber Species with Focus on Cross Laminated Timber (CLT): Test Configuration and...Rolling Shear Properties of some European Timber Species with Focus on Cross Laminated Timber (CLT): Test Configuration and...
SCHERFESTIGKEITSPRÜFUNG (MATERIALPRÜFUNG); TESTING MACHINES AND APPARATUS (MATERIALS SCIENCE); SHEAR STRENGTH TESTING (MATERIALS TESTING); HOLZFORSCHUNG (HOLZINDUSTRIE); WOOD + TIMBER (BUILDING MATERIALS); WOOD PROPERTIES + WOOD TESTING (TIMBER INDUSTRY); SHEAR STRENGTH (ELASTOMECHANICS); PRÜFGERÄTE, PRÜFMASCHINEN (MATERIALWISSENSCHAFTEN); WOOD RESEARCH (TIMBER INDUSTRY); HOLZ-WERKSTOFFE (HOLZINDUSTRIE); HOLZEIGENSCHAFTEN + HOLZPRÜFUNG (HOLZINDUSTRIE); HOLZ (BAUSTOFFE); WOOD MATERIALS (TIMBER INDUSTRY); SCHERFESTIGKEIT + SCHUBFESTIGKEIT (ELASTOMECHANIK ...
Effect of ViscoStat and ViscoStat Plus on Composite Shear Bond Strength in the Presence and Absence of BloodEffect of ViscoStat and ViscoStat Plus on Composite Shear Bond Strength in the Presence and Absence of Blood
Purpose: To examine the effects of the hemostatic agents ViscoStat and ViscoStat Plus on the shear bond strength (SBS) of composite resin (CR) to dentin in the presence and absence of blood. Materials and Methods: Sixty permanent teeth mounted in acrylic were randomly divided into 5 groups (n = 12): (1) control, C; (2) ViscoStat, VS; (3) ViscoStat Plus, VS+; (4) ViscoStat and blood, VS/B; (5) ViscoStat Plus and blood, VS+/B. Groups 2 and 3 were exposed to VS and VS+, respectively. Freshly drawn human blood was placed on groups 4 and 5 immediately followed by VS and VS+, respectively. Specimens remained undisturbed for 1 min and were rinsed with tap water for 1 min. All groups were etched with 35% phosphoric acid and were bonded utilizing the Ultradent bonding clamp, Optibond Solo Plus, and Z-250 composite resin. Following water storage for 48 hrs at 37 C, specimens were debonded in an Instron test frame at a crosshead speed of 0.5 mm/min. Statistical analysis was done with one-way analysis of ...
Pulsatile blood flow, shear force, energy dissipation and Murrays LawPulsatile blood flow, shear force, energy dissipation and Murray's Law
A cellular mechanism that senses shear force at the inner wall of a blood vessel and triggers remodeling that increases the circumference of the wall when a shear force threshold is exceeded would result in the observed scaling of vessel radii described by Murrays Law.
Shear bond strength of different adhesives to Er:YAG laser-prepared dentin. | AVESİSShear bond strength of different adhesives to Er:YAG laser-prepared dentin. | AVESİS
Purpose: The aim of this study was to examine the influence of Er:YAG laser on the shear bond strength of three different adhesives to lased dentin. ...
Glass-ionomer restoratives and liners: shear bond strength to dentin.<...Glass-ionomer restoratives and liners: shear bond strength to dentin.<...
TY - JOUR. T1 - Glass-ionomer restoratives and liners. T2 - shear bond strength to dentin.. AU - Bell, R. B.. AU - Barkmeier, Wayne W.. PY - 1994. Y1 - 1994. UR - http://www.scopus.com/inward/record.url?scp=0028692912&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0028692912&partnerID=8YFLogxK. M3 - Article. C2 - 7803139. AN - SCOPUS:0028692912. VL - 6. SP - 129. EP - 134. JO - Journal of Esthetic and Restorative Dentistry. JF - Journal of Esthetic and Restorative Dentistry. SN - 1496-4155. IS - 3. ER - ...
Blue clay slope angle in relation to some geological and geotechnical characteristics, Italy. | Quarterly Journal of...Blue clay slope angle in relation to some geological and geotechnical characteristics, Italy. | Quarterly Journal of...
Observation of blue clay slopes outcropping along the Italian peninsula (Apennine foredeep and other inland areas) promptedinvestigation into several factors whichgovern their actual slope angle. Though characterized by good gradient, slope angle may differ from slope to slope, as well as within certain limited areas.. The study attempts to connect structural order (dip strata) and shear strength of the soil to explain slope angle. In many cases it is possible to distinguish (i) slope angle controlled by substratum and, thus, characterized by shear strength higher than the residual condition,and (ii) slope angle controlled by colluvium cover,characterized by shear strength reduced to residual.. Following an infinite slope stability model approach, the above conditions are connected to the half residual friction angle value, ϕR′/2, which splits the slopes intotwo main types: cover-controlled, characterized by β≤ϕR′/2 and completely or in part substratum-controlled, characterized by ...
The Journal of Adhesive DentistryThe Journal of Adhesive Dentistry
Materials and Methods: A total of 30 CAD/CAM blocks of lithium disilicate (LD; IPS e.max CAD) were cut into four square sections (6 x 6 x 6 mm; n = 60 per group) and processed as recommended by the manufacturer. The LD specimens were divided into 12 groups according to the following independent variables: silane coupling agent (no silane; silane without 10-MDP [MBS, Monobond S]; silane with 10-MDP [MB+, Monobond Plus]) and adhesive + luting composite (no adhesive + Enforce; no adhesive + RelyX Ultimate; Prime & Bond Elect [PBE], a silane- and MDP-free universal adhesive + Enforce; Scotchbond Universal Adhesive [SBU], a silane- and MDP-containing universal adhesive + RelyX Ultimate). After each treatment, cylindrical, transparent matrices were filled with a luting composite and light cured. Specimens were stored in water (37°C for 24 h or 1 year) and submitted to the microshear bond strength (?SBS) test. The failure pattern and ?SBS were statistically evaluated (? = 0.05). In addition, specimens ...
The Journal of Adhesive DentistryThe Journal of Adhesive Dentistry
Materials and Methods: A total of 30 CAD/CAM blocks of lithium disilicate (LD; IPS e.max CAD) were cut into four square sections (6 x 6 x 6 mm; n = 60 per group) and processed as recommended by the manufacturer. The LD specimens were divided into 12 groups according to the following independent variables: silane coupling agent (no silane; silane without 10-MDP [MBS, Monobond S]; silane with 10-MDP [MB+, Monobond Plus]) and adhesive + luting composite (no adhesive + Enforce; no adhesive + RelyX Ultimate; Prime & Bond Elect [PBE], a silane- and MDP-free universal adhesive + Enforce; Scotchbond Universal Adhesive [SBU], a silane- and MDP-containing universal adhesive + RelyX Ultimate). After each treatment, cylindrical, transparent matrices were filled with a luting composite and light cured. Specimens were stored in water (37°C for 24 h or 1 year) and submitted to the microshear bond strength (?SBS) test. The failure pattern and ?SBS were statistically evaluated (? = 0.05). In addition, specimens ...
Determine equivalent maximum shear stress in spring, Mechanical EngineeringDetermine equivalent maximum shear stress in spring, Mechanical Engineering
Mechanical Engineering Assignment Help, Determine equivalent maximum shear stress in spring, Determine equivalent maximum shear stress in spring: A close coiled helical spring contains a stiffness of 10 N/mm. Its length while fully compressed, with adjacent coils touching each other is 400 mm. G = 80 GPa. (a) Find out the wire diamet
New Adhesives Products - Page 4New Adhesives Products - Page 4
Lap Shear Strength of Adhesives for Nylon to Nylon Bonding Master Bond tested the tensile lap shear strength of several epoxy products to determine their capability in nylon to nylon bonding applications. The testing produced impressive results with many systems delivering high values. While high strength is often crucial, each system also offers a diverse range of other properties that must be... Read More » ...
Aneurysm Growth Occurs at Region of Low Wall Shear Stress. Patient-Specific Correlation of Hemodynamics and Growth in a...Aneurysm Growth Occurs at Region of Low Wall Shear Stress. Patient-Specific Correlation of Hemodynamics and Growth in a...
Thank you for your interest in spreading the word on Stroke.. NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address. ...
GTC 1800-80-33 Fine Pitch CapillariesGTC 1800-80-33 Fine Pitch Capillaries
Process1800 eliminates the previously standard grinding operation used to produce the angle-bottleneck feature on a fine-pitch capillary. Process1800 imparts a high-tension, mirror smooth, secondary alumina skin on the angle bottleneck portion of the tool, substantially increasing shear strength and rigidity. Increased shear strength allows Gaiser Tool Company to produce a more robust, high-strength, small tip diameter, angle-bottleneck capillary. Increased rigidity reduces the ultrasonic energy loss inherent in the angle-bottleneck design, resulting in superior ultrasonic energy transmission and a wider tuning window - ideal for high frequency transducers. ...
New Tool to Improve Geotechnical Site Investigation - Research Highlights - Joint Transportation Research ProgramNew Tool to Improve Geotechnical Site Investigation - Research Highlights - Joint Transportation Research Program
The SPT is a common in situ testing method. Geotechnical site investigations in the United States rely heavily on the SPT. The test is used to determine the geotechnical engineering properties of subsurface soils. The SPT has served as a simple test to estimate the relative density of soils and approximate shear strength parameters for engineers planning geotechnical structures such as foundation design and slope stability checks. The test has remained essentially the same since the 1960s.. One of the advantages of the newly designed SPT-T is that it takes only a few minutes to measure the torque and the conventional SPT procedure remains the same. This provides a reduced amount of effort for the user learning the new equipment. The test measures the torque required to rotate the sampler in the ground at constant rate; the torque is then related to the shear strength in these soils.. This tool has the potential to provide a substantial reduction in cost overruns and change orders caused by ...
Analytical and numerical approaches to estimate peak shear strength of rock joints | KTHAnalytical and numerical approaches to estimate peak shear strength of rock joints | KTH
Time: Thu 2019-04-25 13.00 Location: B3, Brinellvägen 23, plan 1, KTH Subject area: Civil and Architectural Engineering, specialisation in Soil and Rock Mechanics Doctoral student: Francisco Rios Bayona Opponent: Dr Jose Muralha, LNEC, Lissabon, Portugal Supervisor: Professor Stefan Larsson ...
Combination of plaque burden, wall shear stress, and plaque phenotype has incremental value for prediction of coronary...Combination of plaque burden, wall shear stress, and plaque phenotype has incremental value for prediction of coronary...
Large plaque burden, certain phenotypes, and low wall shear stress (WSS) are associated with adverse outcomes and high WSS with development of plaque vulnerability. We aimed to investigate the incremental value of the combination of plaque burden, WS
VJ Tech Ltd Ring Shear Testing System - On-Sample Transducers VJT9530 : VJ Tech LimitedVJ Tech Ltd Ring Shear Testing System - On-Sample Transducers VJT9530 : VJ Tech Limited
Ring Shear Testing System The VJ Tech Ring Shear Testing System produces accurate and repeatable test results to determine the residual shear strength of cohesive soils, which is particularly important when assessing slope stability. The RingSHEAR features a digital display and control panel and can be computer controlled through the USB port. The rotational shearing action is applied continuously until a constant residual strength value is achieved. The advantages of a ring shear machine are that there is no change in the area of the cross section of the shear plane as the test proceeds and the sample can be sheared through an uninterrupted displacement of any magnitude. The user friendly Clisp Studio software conforms to BS1377-7 & ASTM D6467-13. A Ringshear Interface Top Cap Assembly is available which includes an annular stainless steel interface disc with an average roughness of Ra 6.3-12.5 for soil-steel interface testing
GPR68 Senses Flow and Is Essential for Vascular Physiology | FUJIFILM VisualSonicsGPR68 Senses Flow and Is Essential for Vascular Physiology | FUJIFILM VisualSonics
Mechanotransduction plays a crucial role in vascular biology. One example of this is the local regulation of vascular resistance via flow-mediated dilation (FMD). Impairment of this process is a hallmark of endothelial dysfunction and a precursor to a wide array of vascular diseases, such as hypertension and atherosclerosis. Yet the molecules responsible for sensing flow (shear stress) within endothelial cells remain largely unknown. We designed a 384-well screening system that applies shear stress on cultured cells.
The Relationship between Surface Roughness and Shear Properties of Rock JointsThe Relationship between Surface Roughness and Shear Properties of Rock Joints
Authors=ESAKI Tetsuro ! JIANG Yujing ! DU Shouji ! MITANI Yasuhiro ! WADA Yoshinori. Journal/Book_names=Proceedings of the Japan Symposium on Rock Mechanics. Publish_Country=Japan. volume=10. pages=79-84. Publish_year=1998. Publisher=Iwa no Rikigaku Rengokai. Language_of_Text=JA. Language_of_Abs.=EN. Data_Type=SE!CO. Map_Scale=0. ID=200114052. ...
Patente US5104921 - Radiation cured polymer composition - Google PatentesPatente US5104921 - Radiation cured polymer composition - Google Patentes
A cured composition possessing excellent cohesive strength at high temperatures along with excellent adhesion, shear strength and solvent resistance is prepared by the high energy ionizing radiation initiated curing of a polymer composition comprising an alkenyl arene/conjugated diene block copolymer and a oligomer such that the unsaturation index of the composition is minimized. The radiation initiated curing of the adhesive composition is accomplished without requiring the aid of a coupling agent to promote crosslinking of the block copolymer during exposure to the radiation.
3M™ Adhesive Transfer Tape 467MP, Clear, 20 in x 60 yd, 2 mil, 1 roll per case | 3M United States3M™ Adhesive Transfer Tape 467MP, Clear, 20 in x 60 yd, 2 mil, 1 roll per case | 3M United States
3M™ Adhesive Transfer Tape 467MP provides outstanding adhesion to metal and high surface energy plastics. 200MP adhesive delivers excellent shear strength to resist slippage and edge lifting. The tape is temporarily repositionable for placement accuracy. It also performs well after exposure to humidity and hot/cold temperatures. A PCK layflat liner helps prevent curling and buckling in the liner.
Mid-Rise Shear Walls and Diaphragms - WoodWorksMid-Rise Shear Walls and Diaphragms - WoodWorks
Intended for structural engineers or architects with a basic understanding of engineering principles, this presentation will provide an in-depth look at wood-frame shear wall designs commonly used for non-residential and multi-family low-rise and mid-rise buildings, including those with rectangular, offset and open-front plans. Topics will also include: a brief discussion on diaphragm irregularities and the detailing required to maintain continuous load paths across areas of discontinuity; a review of the new 2015 Special Design Provisions for Wind and Seismic (SDPWS) requirements for wood frame shear walls; a new method of analysis for a shear wall with Force Transfer Around an Opening; and available methods to analyze tall shear walls in mid-rise structures and determine their effect on the horizontal distribution of shears through the diaphragm and shear walls.. Content Rating: 1 (low) to 5 (high ...
JVCC TR-2X Adhesive Transfer TapeJVCC TR-2X Adhesive Transfer Tape
JVCC TR-2X is an unsupported acrylic adhesive transfer film tape which is melamine and acid free. High quick tack and good shear strength makes this the best choice for more demanding applications. Rank #110 in ATG & Transfer Tapes category.
3M™ Membrane Switch Spacer Single Coated 7992MP | 3M United States3M™ Membrane Switch Spacer Single Coated 7992MP | 3M United States
3M™ Membrane Switch Spacer Single Coated 7992MP features 3M™ High Performance Acrylic Adhesive 200MP, formulated for excellent shear strength, on a 2 mil carrier. This clear PET film provides a smooth, bright appearance, eliminating the need for floodcoat on overlays and keypads. The adhesive withstands repeated switch actuation and forms neat, clean edges for precise slitting and die-cutting.
RAM Frame - Rigid Diaphragm Constraints and Frame Shear [TN]<...RAM Frame - Rigid Diaphragm Constraints and Frame Shear [TN]<...
From this it can be seen that VA cannot be equal to VB unless M is zero, and in fact that VA must be greater than VB, which is what the results from RAM Frame indicate. This shows that the distribution of the shear is not merely a function of the wall cross section at a level but is also a function of the loading and displacements of the walls above. Under these conditions the short walls pull shear out of the tall walls.. Note that the above is a simplification of the behavior of the structure. For example, it does not take into account the effects of shear deformation (a 1.2VH/AE term would be added to each side, where V is VA and VB, respectively). However, the above discussion is sufficient for the point at hand.. Also note that this assumes a rigid diaphragm, capable of transmitting the shear out of one wall into another. If the diaphragm has insufficient strength or insufficient rigidity, the analysis performed by RAM Frame considering a rigid diaphragm is not valid for that ...
JVCC DC-PEF12A Double-Coated Polyethylene Foam Tape .125InJVCC DC-PEF12A Double-Coated Polyethylene Foam Tape .125In
Use JVCC DV-PEF12A Double-Coated Polyethylene Foam Tape for quick-stick and high shear properties. It provides secure bonding. Rank #90 in Double-Sided Tape category.
Figure 25 | Experimental Study on Shear Failure Mechanism and the Identification of Strength Characteristics of the Soil-Rock...Figure 25 | Experimental Study on Shear Failure Mechanism and the Identification of Strength Characteristics of the Soil-Rock...
Figure 25: Experimental Study on Shear Failure Mechanism and the Identification of Strength Characteristics of the Soil-Rock Mixture
Computational modeling of flow-induced alignment of nano-cellulose fibrilsComputational modeling of flow-induced alignment of nano-cellulose fibrils
The work met with certain complexity due to highly non-linear behavior of the Carreau model with parameters fitted for rheological data of CNF suspensions. However, some important conclusions have been obtained from the results. It has been shown that the main parameter which affects the alignment of fibrils inside the flow is shear rate. Decreasing diameter and increasing flow rate both have resulted in increase in shear rate throughout the diameter of the capillary tube. Simulation of CNF suspensions with different concentrations resulted in an unexpected trend for velocity profiles and change in length of capillary did not affect velocity profiles or shear rate inside the capillary tube. The effect of these parameters was also studied for shear stress and it was shown that the change in diameter, flow rate and concentration of suspensions significantly change the trend of shear stress profiles ...
Wilko De-Lux Swivel Grass Shears at wilko.comWilko De-Lux Swivel Grass Shears at wilko.com
Wilko De-Lux Swivel Grass Shears - Trim ornamental grasses and create precise lawn edging the easy way with the Wilko Swivel Grass Shears. Their swivel action, carbon steel blades take the strain out of gardening and you can choose between 8 cutting positions depending on your needs. These grass shears are finished with a quick release lock for added safety. Warning: Contains functional blade. Always store garden tools in a secure place and keep out of reach of children., 000 from Wilko.com
Subcommittee D04.47 : Published standards under D04.47 jurisdictionSubcommittee D04.47 : Published standards under D04.47 jurisdiction
2 Showing results 1-2 of 2 matching Proposed New Standards under the jurisdiction of D04.47 D04 Home. WK56908 Determination of density and relative density of asphalt, semi-solid bituminous materials and soft-tar pitch by use of a digital density meter (U-tube) WK57910 Tackiness of Asphalt Binders Using the Dynamic Shear Rheometer (DSR) ...
Spread Footings Under Biaxial Bending: A Complex Design Subject - Structural Engineering SoftwareSpread Footings Under Biaxial Bending: A Complex Design Subject - Structural Engineering Software
What about the shears in the footing?. The shear is produced by the soil bearing pressure acting upwards on the footing. If the pressure is uniform, or if the entire footing is under compression, this force can be easily calculated as the volume of the parallelogram delimited by the critical section, the footing edges, and the bearing pressure. Consider now a partial bearing diagram, such as the Type II, III or IV above, and trace the shear critical section. Try to visualize the resulting irregular shape formed in this scenario, as shown in the figures below in lighter blue. You still need to calculate the volume of this amorphous solid formed by inclined and vertical planes that resembles a stalactite, but now the calculation is substantially harder to accomplish.. ASDIP FOUNDATION uses an algorithm based on triple integrals of the type V = ∫∫∫dV to find the volume of these solids, and therefore the shear forces in the footing. The pictures below show the factored shear forces of a ...
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Like primers for the face eye primers come in different consistencies, theres liquid, gel and mousse varieties and it is used as a base - applied before eye-shadow/liner and optional to apply concealer first before the base or just go ahead with the primer application.. Liquid primers I find are best to suit all types of skin and ages but it is ideal for dry eye-lids, mature skin and sensitive thin skin, the texture of this is usually creamy and thicker than what the liquid name would make you assume, its creamy texture makes it very easy to apply and to make sure to rub it in and keep eyes closed for a few seconds for it to settle into the skin (sometimes it can crease - simply rub and blend any crease lines out) any eye primer thats the equivalent to fluid and very watery I would say is a no-go, chances are the products off or its just not going to be strong enough as a base. The same attributes can be applied to cream primers, the only thing is that they are thicker so it depends on ...
AS3600 shear wall design - AS/NZS (au/nz) Code Issues - Eng-TipsAS3600 shear wall design - AS/NZS (au/nz) Code Issues - Eng-Tips
I am canvasing opinions of engineers on shear wall design. I find AS3600 cl 11.5 very limiting and highly illogical (wrong) for tall buildings. In Australia fra
Kreator Pruning branches KRTGR4014 - Pruning shears | Alza.co.ukKreator Pruning branches KRTGR4014 - Pruning shears | Alza.co.uk
Pruning shears Kreator Pruning branches KRTGR4014, |p>Adjusting beloved garden is very important and challenging, but if you have at hand right tools, everything will go well from the hand. Kreator...|/p>
Lopping Shears - Anvil, Bypass & Compound Loppers at Ace Hardware!Lopping Shears - Anvil, Bypass & Compound Loppers at Ace Hardware!
Shop Lopping Shears at acehardware.com and get Free Store Pickup at your neighborhood Ace. Buy Online & Pickup Today. See Details.
44C Rhonda Shear Wire-Free Bras | Bare Necessities44C Rhonda Shear Wire-Free Bras | Bare Necessities
Get free shipping on our womens 44C Rhonda Shear Wire-Free today! Treat yourself and look your best with our great selection of bras.
Shear Stress, AMPK, and Endothelial Functions - John ShyyShear Stress, AMPK, and Endothelial Functions - John Shyy
The prevalent distribution of atherosclerotic lesions in the curvature and branches of arterial trees demonstrates the critical role of flow patterns in predisp...
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A 100 fold range of shear stress (.04-4 dynes/cm$\sp2$) was used to demonstrate that the level of shear used in conjugate enumeration assays affects the absolute magnitude of CTL-TC conjugates observed. Kinetic analysis ...
Physical UV Defense SPF 30 - HAPPIPhysical UV Defense SPF 30 - HAPPI
500g): 1. Combine A and mix well using a dispersing blade. 2. Combine B and mix well. 3. Slowly add B to A and mix for ~10 minutes under moderate shear. 4. Add C and mix until uniform. 5. Add phase D and mix until uniform ...
Effect of thermocycling on shear bond strength of glass ionomer cements<...Effect of thermocycling on shear bond strength of glass ionomer cements<...
TY - JOUR. T1 - Effect of thermocycling on shear bond strength of glass ionomer cements. AU - Ballal, Nidambur Vasudev. AU - Paulson, Liz. AU - Ginjupalli, Kishore. AU - Ozcan, Mutlu. PY - 2019/1/1. Y1 - 2019/1/1. N2 - To evaluate the effect of thermocycling on shear bond strength of Fuji IX glass ionomer cement and a novel glass ionomer cement (Ketac Universal) to dentin. A total of 40 extracted human molars were divided into 4 groups (n = 10). The occlusal surfaces were ground flat to expose dentin using diamond discs. Dentin surfaces were treated according to manufacturers instructions, and restorative materials were applied onto a plastic mold of 3mm height and 4mm diameter. The shear bond strength of Ketac Universal and conventional Fuji IX glass ionomer cements was evaluated after 24 h using Instron Universal Testing Machine at a crosshead speed of 0.5 mm/min before and after the specimens were subjected to thrmocycling. There was no statistical difference in the shear bond strength of ...
Microshear bond strength of preheated silorane- and methacrylate-based composite resins to dentin | AVESİSMicroshear bond strength of preheated silorane- and methacrylate-based composite resins to dentin | AVESİS
The aim of this study was to investigate the effect of preheating on microshear bond strength (MSBS) of silorane and methacrylate-based composite resins to human dentin. The teeth were randomly divided into three main groups: (1) composite resins were heated upto 68 degrees C; (2) cooled to 4 degrees C; and (3) control [room temperature (RT)]. Each group was then randomly subdivided into four subgroups according to adhesive system used [Solobond M (Voco), All Bond SE (Bisco), Clearfil SE Bond (CSE) (Kuraray), Silorane adhesive system (SAS) (3M ESPE)]. Resin composite cylinders were formed (0.9mm diameterx0.7mm length) and MSBS of each specimen was tested. The preheated groups exhibited the highest MSBS ( ...
Influence of NaOCl deproteinization on shear bond strength in function of dentin depth<...Influence of NaOCl deproteinization on shear bond strength in function of dentin depth<...
TY - JOUR. T1 - Influence of NaOCl deproteinization on shear bond strength in function of dentin depth. AU - Toledano, Manuel. AU - Perdigão, Jorge. AU - Osorio, Estrella. AU - Osorio, Raquel. PY - 2002/8/1. Y1 - 2002/8/1. N2 - Purpose: To determine the influence of NaOCl application on shear bond strengths (SBS) to superficial and deep dentin, using Prime & Bond 2.1. Materials and Methods: Superficial and deep dentin was exposed in 40 extracted third molars by sectioning the occlusal surface immediately under the enamel-dentin junction or close to the pulp chamber. After polishing the dentin disks (600-grit SiC), they were assigned to two groups: (1) 36% orthophosphoric acid for 15 seconds, or (2): 36% orthophosphoric acid for 15 seconds followed by 5% sodium hypochlorite (NaOCl) for 2 minutes. The dentin adhesive was applied as per manufacturers instructions, followed by TPH resin-based composite. The specimens were stored in water for 24 hours at 37°C and thermocycled x500 and SBS were ...
Shear bond strength of the Tenure Solution dentin bonding system.<...Shear bond strength of the Tenure Solution dentin bonding system.<...
TY - JOUR. T1 - Shear bond strength of the Tenure Solution dentin bonding system.. AU - Barkmeier, Wayne W.. AU - Cooley, R. L.. PY - 1989/10. Y1 - 1989/10. N2 - A liquid solution of an oxalate bonding system containing NTG-GMA and PMDM has become commercially available. The bond strength of this oxalate adhesive (Tenure Solution) to dentin was determined by bonding composite resin cylinders to extracted teeth. The bond strengths obtained in this study are compared to the bond strengths obtained in earlier studies with the first and second generation oxalate adhesives whose components were supplied as powders and required mixing. The oxalate solutions developed significantly higher bond strengths than the original powder type systems.. AB - A liquid solution of an oxalate bonding system containing NTG-GMA and PMDM has become commercially available. The bond strength of this oxalate adhesive (Tenure Solution) to dentin was determined by bonding composite resin cylinders to extracted teeth. The ...
Studying Shear Performance of Flax Fiber-Reinforced Clay by Triaxial TestStudying Shear Performance of Flax Fiber-Reinforced Clay by Triaxial Test
Laboratory triaxial tests were carried out to investigate the reinforcement mechanism, to study the characteristics of flax fiber-reinforced clay, and to discuss the effect on stress-strain relationship and shear strength parameters of flax fiber-reinforced clay in different flax fiber content and different confining pressure. Respectively, the ratio of fiber content to clay by weight is 0.2%, 0.4%, 0.6%, 0.8%, and 1.0%, and the confining pressure is 100 kPa, 200 kPa, and 300 kPa in triaxial test. The test results show that, the shear strength of flax fiber-reinforced clay is greater than that of pure clay. Compared with the pure clay, the shear strength of flax fiber-reinforced clay increased as the cohesion and friction increased; while the increase of the friction is relatively small, the increase of cohesion is large. The shear strength firstly increased and then reduced with the increase of flax fiber content. When the fiber content was 0.8&
Effects of Wheat Flour Dough’s Viscoelastic Level by Adding Glucose Oxidase on its Dynamic Shear Properties whatever the...Effects of Wheat Flour Dough’s Viscoelastic Level by Adding Glucose Oxidase on its Dynamic Shear Properties whatever the...
Effects of Wheat Flour Dough’s Viscoelastic Level by Adding Glucose Oxidase on its Dynamic Shear Properties whatever the Strain Modes
Cytosolic Alkalinization of Vascular Endothelial Cells Produced by an Abrupt Reduction in Fluid Shear Stress | Circulation...Cytosolic Alkalinization of Vascular Endothelial Cells Produced by an Abrupt Reduction in Fluid Shear Stress | Circulation...
The acute and chronic adaptation to changes in blood flow occur as a result of endothelium-dependent responses that regulate vascular tone and the organization of the blood vessel wall. Among the most rapid responses of vascular endothelial cells to changes in fluid shear stress are K+ channel activation,2 generation of inositol trisphosphate,3 an increase in [Ca2+]i,23 24 and changes in pHi.4 5 The present study shows that an abrupt decrease in fluid shear stress produces cytosolic alkalinization of vascular endothelial cells by affecting membrane ion transporters that contribute to pHi regulation. After a period of exposure to continuous fluid shear stress at 2.7 dyne/cm2, the abrupt reduction of fluid shear stress from 2.7 to 0.3 dyne/cm2 produced a bicarbonate-dependent increase in pHi of 0.27 pH unit, which was not affected by prior inhibition of the Na+-H+ exchanger alone. Recovery from an NH4Cl prepulse-induced acid load occurred more rapidly when fluid shear stress was abruptly reduced ...
Shear Strength and Polymer Friction | SpringerLinkShear Strength and Polymer Friction | SpringerLink
The friction coefficient of thin polymer sheets under high loads can be accounted for by a simple extension of the adhesion theory of friction in which the pressure dependence of the shear strength...
Discussion on Mackintosh-vs-vane estimation of undrained shear strength correlation for a sabkha clay of Saudi Arabia by D....Discussion on 'Mackintosh-vs-vane estimation of undrained shear strength correlation for a sabkha clay of Saudi Arabia' by D....
A. N. James and A. L. Little write: Hossain and Ali have presented an interesting set of results obtained for an Obhor sabkha clay near Jedda, suggesting a tentative correlation between undrained shear strength (measured by a field vane test) and the M-value (number of blows for 0.3 m penetration) obtained using a Mackintosh probe. :Figures 2-4 of the paper show clearly that one of the difficulties in dealing with sabkha is the considerable scatter of results and the variation in the nature of the basic material comprising the sabkha.. In a previous paper, Hossain & Ali (1988) divided the upper 5 metres of the Obhor Sabkha into two main zones:. Zone I: a landward zone, predominantly clayey beneath a thin (c. 0.5 m) layer of loose sand;. Zone II: a seaward zone, predominantly sandy with a thin (c. 0.5 m) cemented sandy crust.. A small subzone, IIA, is described as clay over sandy sabkha. For the upper soft clay (at Zone I) they give liquid limits between 20% and 50 0.000000or the top crust ...
In vitro shear bond strength of adhesive to normal and fluoridated enamel under various contaminated conditionsIn vitro shear bond strength of adhesive to normal and fluoridated enamel under various contaminated conditions
Objective: This study examined the shear bond strength of bonding agents to normal or fluoridated enamel following use of weak or strong acids to prepare enamel surfaces and after contamination with a measured amount of saliva at various stages of the bonding procedure. Method and materials: One hundred extracted human third molar teeth were randomly separated into 2 basic groups (normal or fluoridated teeth), then divided into 5 subgroups. Group A specimens were not contaminated. After etching, enamel surfaces were dry and clean. Group B was left with wet surfaces after etching. Group C specimens were contaminated with artificial saliva and then dried. Group D specimens were contaminated with artificial saliva, rinsed, and then dried. In group E, all enamel surfaces were left contaminated with saliva after the etching procedures (with maleic acid or phosphoric acids). Adhesive resins were applied to all enamel surfaces according to the manufacturer s instructions. The specimens were then ...
Transient and Steady-State Effects of Shear Stress on Endothelial Cell Adherens Junctions | Circulation ResearchTransient and Steady-State Effects of Shear Stress on Endothelial Cell Adherens Junctions | Circulation Research
The structure and physiology of the endothelial cells that line the mammalian vasculature are greatly influenced by the shear stresses that are continuously imposed on them by blood flow. The most obvious structural responses of endothelium to shear stress are changes in cell shape and orientation; in areas of low or inconsistent shear stress in vivo, or when cells are maintained in static culture, endothelial cells assume a cuboidal, cobblestone morphology, whereas they elongate and align in the direction of flow when shear stress is moderate or high.1 2 These morphological changes are adaptive in that they reduce the spatial fluctuations in shear stress and the maximum shears to which the cells are exposed.3 Shape change of cells within monolayers probably necessitate changes in the interaction of individual cells with their neighbors at cell-cell junctions; however, changes in endothelial cell-cell contacts during responses to altered shear stress have not been examined. Endothelial cells ...
Adhesive and Sealant CouncilAdhesive and Sealant Council
Hernon Manufacturing Inc. is launching a two-component methacrylate adhesive under the brand name Fusionbond370. It is able to bond thermoplastics, metal, wood and composites and will be used for marine, automotive and construction applications. Apart from being able to bond dissimilar substrates, the adhesive is fatigue and impact-resistant and is able to tolerate exposure to salt spray while maintaining the integrity of bonds at temperatures ranging from -100 F to 250 F. Shear strength varies from 620 psi to 3,000 psi depending on substrate.. Palm Labs Adhesives is expanding its range of fluorescent Cyanoacrylate adhesives with Turbo Fuse 130 FY, an adhesive with a curing time of 24 hours at room temperature. When exposed to ultraviolet light, the adhesive glows yellow, allowing for easy inspection of bonds. It is able to bond plastics, metals, elastomers and wood with a shear strength of 3,000 psi at temperatures of -65F to 180F.. ...
E-MEXP-1304 - Transcription profiling of Arabidopsis seedlings grown under thermocycles and/or photocycles or continuous...E-MEXP-1304 - Transcription profiling of Arabidopsis seedlings grown under thermocycles and/or photocycles or continuous...
In most organisms biological processes are partitioned, or phased to specific times over the day through interactions between external cycles of temperature (thermocycles) and light (photocycles), and the endogenous circadian clock. This orchestration of biological activities is achieved in part through an underlying transcriptional network. To understand how thermocycles, photocycles and the circadian clock interact to control time of day specific transcript abundance in Arabidopsis thaliana, we conducted four diurnal and three circadian two-day time courses using Affymetrix GeneChips (ATH1). All time courses were carried out with seven-day-old seedlings grown on agar plates under thermocycles (HC, hot/cold) and/or photocycles (LD, light/dark), or continuous conditions (LL, continuous light; DD, continuous dark, HH, continuous hot). Whole seedlings (50-100), including roots, stems and leaves were collected every four hours and frozen in liquid nitrogen. The four time courses interrogating the
Evaluation of an Orthodontic Adhesive with Combined Primer and CompositeEvaluation of an Orthodontic Adhesive with Combined Primer and Composite
Objectives: To investigate the efficacy of a new orthodontic bonding system that incorporates the primer solution in the adhesive. Materials and Methods: 90 anterior bovine teeth were divided in three groups: in Group I, brackets were bonded with Transbond XT system, in Group II with GC Ortho Connect which incorporates the primer in the adhesive, and in Group III, a single layer of primer was applied on the teeth before bonding the brackets with GC Ortho Connect. After a 24-hour latency period, Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) were measured. In cases with remnants left mainly on the bracket base, energy dispersive X-ray (EDX) spectrometry was performed in order to determine the presence of calcium particles. Selected cases were examined with Scanning Electron Microscopy (SEM) analysis and in nanometer scale with a confocal visible light microscope (μsurf revolver, NanoFocus AG, Germany). Results: The mean SBS values were 7.25 ± 0.58 MPa for Group I, 6.57 ± 0.50 MPa for Group
Novel Approach in Sampling and Tensile Strength Evaluation of Roots to Enhance Soil for Preventing ErosionNovel Approach in Sampling and Tensile Strength Evaluation of Roots to Enhance Soil for Preventing Erosion
This paper presents novel approaches to address the complex issues associated with preservation, transportation, and tensile testing of the vegetation root samples needed for the enhancement of soil and prevent erosion. Readily availability of no equipment for in-situ assessment of the roots contribution to soil strength forces the researchers to transport the root samples to the lab for testing and estimating the contribution to the soil shear strength. Moreover, the standard procedures and apparatuses available in the public domain are regrettably suitable for testing of relatively stiffer materials. Therefore, conducting the tensile test of roots using off-the-shelf equipment often causes premature failure of the soft tissues and produces an erratic result, which ultimately leads to unrealistic soil shear strength. The experimental work replaced the traditional jaw type grips by innovative 3D-printed mold or metal ring with silicone, epoxy, and hot-glue to ensure a minimal degree of damage to the
Grain Boundaries Softening Thermoelectric Oxide BiCuSeO - CaltechAUTHORSGrain Boundaries Softening Thermoelectric Oxide BiCuSeO - CaltechAUTHORS
Engineering grain boundaries (GBs) are effective in tuning the thermoelectric (TE) properties of TE materials, but the role of GB on mechanical properties, which is important for their commercial applications, remains unexplored. In this paper, we apply ab initio method to examine the ideal shear strength and failure mechanism of GBs in TE oxide BiCuSeO. We find that the ideal shear strength of the GB is much lower than that of the ideal single crystal. The atomic rearrangements accommodating the lattice and neighbor structure mismatch between different grains leads to the much weaker GB stiffness compared with grains. Failure of the GBs arises from either the distortion of the Cu-Se layers or the relative slip between Bi-O and Cu-Se layers. This work is crucial to illustrate the deformation of GBs, laying the basis for the development and design of mechanically robust polycrystalline TE materials. ...
All Faculty | Duke Mechanical Engineering and Materials ScienceAll Faculty | Duke Mechanical Engineering and Materials Science
The mechanical properties and microstructure of articular cartilage from the canine tibial plateau were studied 12 weeks after total medial meniscectomy. The organization of the birefringent collagen network was measured with quantitative polarized light microscopy to determine the thickness and the degree of organization of the superficial and deep zones. The zonal concentration of sulfated glycosaminoglycan was quantified with digital densitometry of safranin-O staining. Equilibrium compressive and shear properties, as well as dynamic shear properties, were measured at sites adjacent to those of microstructural analysis. The results evinced significant loss of cartilage function following meniscectomy, with decreases of 20-50% in the compressive and shear moduli. There was no evidence of alterations in the degree of collagen fibrillar organization, although a complete loss of the surface zone was seen in 60% of the samples that underwent meniscectomy. Meniscectomy resulted in a decreased ...
Attrition of paracetamol and aspirin under bulk shear deformation - Surrey Research Insight Open AccessAttrition of paracetamol and aspirin under bulk shear deformation - Surrey Research Insight Open Access
Particles are frequently exposed to shear stresses during manufacturing, which leads to breakage. This is particularly relevant to weak active pharmaceutical ingredients and is prevalent in pharmaceutical and food industries. The attrition of Paracetamol and Aspirin caused by shear deformation at very low stresses is investigated here. The extent of breakage of these particles is related to the prevailing shear stresses and strains. In contrast to the expected trend, smaller particles exhibited increased breakage rates. At the onset of shearing at low stresses Aspirin particles experienced slightly more breakage than the Paracetamol, however prolonged shearing resulted in greater breakage of Paracetamol. Breakage occurred initially through chipping with some fragmentation, particularly more noticeable for Aspirin, with an increase in abrasion after extensive shear strain for Paracetamol. Empirical breakage relationships are proposed and when combined with process stresses and strain analyses the ...
Journal of Civil Engineering and Construction Technology - shear behaviour of palm kernel shell reinforced concrete beams...Journal of Civil Engineering and Construction Technology - shear behaviour of palm kernel shell reinforced concrete beams...
This study investigated the influence of beam depth with varying longitudinal reinforcement without shear reinforcement. Size effect, which is described here in as the decrease in shear strength with the increase in the depth of members, is not evaluated sufficiently enough. To this end, fifteen palm kernel shell (PKS) reinforced concrete beams varying from 150 to 300 mm were tested to investigate their size effects on ultimate shear capacity and failure modes. Test variables were longitudinal reinforcement ratio (ρw varying from 1 to 2%) and effective depth of beams (varying from 120 to 265 mm) with average compressive strength (fcu) = 30.3 MPa and shear span to effective depth (av/d) = 2.5. For the range of variables tested, the test results were compared with the strengths predicted by the ACI 318-08 and BS 8110 with and without reduction factors. All tested beams failed in shear failure modes and were influenced by the beam depth and amount of longitudinal reinforcement. The PKS beams were
In Vitro Shear Bond Strength of Self-Etching Adhesives in Comparison to 4th and 5th Generation Adhesives - PubMedIn Vitro Shear Bond Strength of Self-Etching Adhesives in Comparison to 4th and 5th Generation Adhesives - PubMed
Resulcin Aqua Prime & Monobond N and AC-Bond were not significantly different than established 5th generation products. AC-Bond + Desensitizer and Prompt L-Pop have significantly different SBS from established 4th and 5th generation products. Future studies are required to investigate marginal i …
Polymerization with the argon laser: curing time and shear bond strength.Polymerization with the argon laser: curing time and shear bond strength.
The objective of this study was to determine the efficiency of an argon laser in polymerizing a light-cured orthodontic adhesive. Metal brackets were bonded to 185 premolars, divided into 5 different protocol groups of 37 each as follows: light 40-se
Faculty Collaboration Database - Revealing the role of phosphatidylserine in shear stress-mediated protection in endothelial...Faculty Collaboration Database - Revealing the role of phosphatidylserine in shear stress-mediated protection in endothelial...
Previous studies have demonstrated that endothelial cells exposed to laminar shear stress are protected from apoptotic stimuli such as tumor necrosis factor (TNF)-alpha. The authors investigated the role of phosphatidylserine (PS) in this phenomenon. Western blot analysis of cleaved caspase 3 was used as an indicator of apoptosis and revealed that in the absence of serine, endothelial cells exposed to laminar shear stress were unable to protect against TNF-alpha-induced apoptosis, in contrast to sheared cells grown in regular medium. It was also found that shear-induced activation of the Akt pathway was significantly decreased in cells grown without serine. In addition, quantitation of PS using a novel isotopic labeling technique involving the use of formalin revealed that stearoyl-oleic PS (18:0/18:1) did not increase during shear treatment. These findings suggest that basal levels of PS are required to activate survival pathways in endothelial cells and thereby contribute to the overall ...
Brevet US20040038058 - Laminated structures - Google BrevetsBrevet US20040038058 - Laminated structures - Google Brevets
Hot-melt, pressure-sensitive adhesive compositions of amorphous polyalphaolefin and crystalline polypropylene have improved bond strength over the amorphous polyalphaolefin alone. The adhesive compositions improve dynamic shear strength, dynamic peel strength, as well as static peel strength. The adhesive compositions are particularly suitable for use in absorbent articles.
web-archive-uk.com: emkayplastics.co.uk - Emkay Plastics Ltd | Plastics Researchweb-archive-uk.com: emkayplastics.co.uk - Emkay Plastics Ltd | Plastics Research
is converted to polymethacrylimide Rohacell 31 IG F Properties Metric English Comments Physical Properties Density 0 032 g cc 0 00116 lb in ASTM D 1622 63 Water Absorption 19 5 19 5 Equilibrium at 98 RH Moisture Absorption at Equilibrium 1 5 1 5 15 RH Moisture Absorption at Equilibrium 2 9 2 9 30 RH Moisture Absorption at Equilibrium 4 7 4 7 50 RH Moisture Absorption at Equilibrium 6 6 65 RH Water Absorption at Saturation 13 13 Volume 50 days immersion at 20fC Moisture Expansion Max 1 Max 1 50 days immersion at 20fC Mechanical Properties Tensile Strength Ultimate 0 979 MPa 142 psi ASTM D 638 68 Elongation break 3 5 3 5 ASTM D 638 68 Modulus of Elasticity 0 0353 GPa 5 12 ksi ASTM D 638 68 Flexural Yield Strength 0 786 MPa 114 psi ASTM D 790 66 Compressive Yield Strength 0 393 mpA 57 PSI ASTM D 790 66 Shear Modulus 0 0128 1 85 ksi ASTM C 273 61 Shear Modulus 0 0137 1 99ksi ASTM D 2236 69 Shear Strength 0 393 MPa 57 psi ASTM C 273 61 Electrical Properties Dielectric Constant 1 05 1 05 5 0 GHz ...
Plus itPlus it
atherosclerosis is a leading cause of morbidity and mortality in developed countries and is shown to be an inflammatory disease (22, 28). Although multiple systemic factors such as hypercholesterolemia, diabetes, hypertension, and smoking are well-known risk factors, atherosclerosis occurs preferentially at particular areas of disturbed flow characterized by low and oscillatory wall shear stress (WSS) in branched or curved arteries (19, 34). In contrast, straight arterial regions are exposed to high and stable shear stress and are well protected from atherosclerosis (34). Despite the close association between the two, evidence directly linking disturbed flow conditions to atherosclerosis has been lacking, and the mechanisms responsible for pro- and antiatherogenic effects of shear stress are still incompletely understood.. Shear stress is the tangential force imparted by viscous fluid flowing over endothelial cells (5, 16). Endothelial cells sense changes in shear stress and trigger ...
Shear (sheet metal) - WikipediaShear (sheet metal) - Wikipedia
The machine used is called a squaring shear, power shear, or guillotine. The machine may be foot powered, less commonly hand powered, or mechanically or hydraulically powered. It works by first clamping the material with a ram. A moving blade then comes down across a fixed blade to shear the material. For larger shears the moving blade may be set on an angle or "rocked" in order to shear the material progressively from one side to the other; this angle is referred to as the shear angle. Setting the blade on an angle decreases the amount of force required, but increases the stroke. A 5 degree shear angle decreases the force by about 20%. The amount of energy used is still the same. The moving blade may also be inclined 0.5 to 2.5°, called the rake angle, to keep the material from becoming wedged between the blades. However, raking the blade compromises the squareness of the edge.[4] The machine consists of a shear table, work-holding device, upper and lower blades, and a gauging device. The ...
Layering and shear properties of an ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate, confined to nano-films between mica...Layering and shear properties of an ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate, confined to nano-films between mica...
We report high-resolution measurements of the forces between two atomically smooth solid surfaces across a film of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid, for film thickness down to a single ion diameter. For films thinner than ∼2 nm oscillatory structural forces are observed as the surface se
17β-Estradiol Restores Endothelial Nitric Oxide Release to Shear Stress in Arterioles of Male Hypertensive Rats | Circulation17β-Estradiol Restores Endothelial Nitric Oxide Release to Shear Stress in Arterioles of Male Hypertensive Rats | Circulation
Arterioles that had been exposed to 17β-E2 overnight exhibited a significantly augmented dilation in response to increases in flow compared with control responses, as shown by the significant leftward shift in the slope of the flow-diameter curves (Figure 1⇑, top). These responses were not altered by incubation with 17α-E2 (Figure 4⇑, top), indicating a specific action of 17β-E2 on the vascular function. The physiological relevance of the enhanced flow-induced dilation is indicated further by the calculation of wall shear stress (Figure 1⇑, bottom). It shows a significant leftward shift of the shear stress-diameter curve after incubation with 17β-E2, revealing that the value of shear stress required to dilate arterioles maximally is significantly less than in control. These findings support the idea that in hypertension, impairment of the regulation of shear stress in arterioles, because of a lesser release of endothelial NO, may contribute to the elevated peripheral resistance.9 17 ...
Shear Stress Activates p60src-Ras-MAPK Signaling Pathways in Vascular Endothelial Cells | Arteriosclerosis, Thrombosis, and...Shear Stress Activates p60src-Ras-MAPK Signaling Pathways in Vascular Endothelial Cells | Arteriosclerosis, Thrombosis, and...
The major finding of this study is the identification of a shear stress-induced p60src signaling pathway that regulates the transcriptional activation of TRE and SRE via MAPKs, including both JNK and ERK pathways. The src-family PTKs possess several structural features that include (1) an approximately 60-amino acid src homology 3 (SH3) domain that is involved in the interaction with signaling molecules that have proline-rich regions, (2) an approximately 100-amino acid src homology 2 (SH2) domain that can recognize the phosphorylated tyrosine of many RTKs, and (3) a kinase catalytic domain (see References 42 and 4342 43 for review). The activation of p60src by shear stress suggests that SH2- and SH3-containing molecules may be involved in the shear stress-induced signal transduction pathways and that RTKs may be upstream to such pathways. We have recently found that the Shc·Grb2·Sos ternary complex is involved in the endothelial gene expression in response to shear stress.44 Shc and Grb2 are ...
Evaluation Of The Effect Of Different Surface Treatments, Aging And En | CCIDEEvaluation Of The Effect Of Different Surface Treatments, Aging And En | CCIDE
Evaluation Of The Effect Of Different Surface Treatments, Aging And Enzymatic Degradation On Zirconia-Resin Micro-Shear Bond Strength
Exact Lévy-type solutions for bending of thick laminated orthotropic plates based on 3-D elasticity and shear deformation...Exact Lévy-type solutions for bending of thick laminated orthotropic plates based on 3-D elasticity and shear deformation...
Exact solutions for static bending of symmetric laminated orthotropic plates with different Lévy-type boundary conditions are developed. The shear deformation plate theories of Mindlin-Reissner and Reddy as well as the three-dimensional elasticity theory are employed. Using the minimum total potential energy principle, governing equilibrium equations of laminated orthotropic plates and pertaining boundary conditions are derived. Closed-form Lévy-type solutions are obtained for the governing equations of both theories using separation of variables method and different types of classical boundary conditions, namely simply-supported, clamped and free edge, are exactly satisfied. Thereafter, 3-D elasto-static equations for orthotropic materials are solved for bending analysis of laminated plates using two different approaches. First, the method of separation of variables is utilised and an exact closed-from solution is achieved for simply-supported laminated orthotropic plates. Next, a combined Fourier
Gulf ScientificGulf Scientific
Used to determine the physical and mechanical properties of raw materials and components, Lloyd Instruments manufactures and supplies universal testing machines (UTM) and tensile testers worldwide. The wide range of material testing machines can test for tensile strength, compression, flexure, friction, tear, peel, adhesion, shear, ductility, insertion, shear strength and many other parameters. Lloyd Instruments texture analyzers have an international reputation for their high performance and cost effectiveness. Specially engineered food texture probes provide the platform to perform rapid, general food testing and detailed texture analysis on a diverse range of foods.. DavenportTM Polymer Testing Products. Melt Flow Index (MFI): The Davenport Melt Flow Indexer is used to determine the melt flow properties of a polymer by extruding it in a molten state, through a calibrated die using a reference weight. It is used extensively in production and quality control to ensure batch-to-batch consistency ...
Materials | Free Full-Text | Influence of Interleaved Films on the Mechanical Properties of Carbon Fiber Fabric/Polypropylene...Materials | Free Full-Text | Influence of Interleaved Films on the Mechanical Properties of Carbon Fiber Fabric/Polypropylene...
A laminated composite was produced using a thermoplastic prepreg by inserting an interleaved film with the same type of matrix as the prepreg during the lay-up process to improve the low interlaminar properties, which is a known weakness of laminated composites. Carbon fiber fabric (CFF) and polypropylene (PP) were used to manufacture the thermoplastic prepregs. Eight prepregs were used to produce the laminated composites. Interleaved films with different thicknesses were inserted into each prepreg. The physical properties of the composite, such as thickness, density, fiber volume fraction (Vf), and void content (Vc), were examined. The tensile strength, flexural strength, interlaminar shear strength (ILSS), impact property, and scanning electron microscopy (SEM) were used to characterize the mechanical properties. Compared to the composite without any inserted interleaved film, as the thickness of the inserted interleaved resin film was increased, Vc decreased by 51.45%. At the same time, however, the
Brevet US5874137 - Organometallic solvent seaming of cellulosic materials - Google BrevetsBrevet US5874137 - Organometallic solvent seaming of cellulosic materials - Google Brevets
An improved method is described for the fusing, joining or seaming of cellulosic materials. The method utilizes a solution of selected organometallic compounds or metal oxides to rapidly crosslink opposing, overlapping cellulosic surfaces to provide secure seams. Enhanced seam strength is achieved by a subsequent moisture treatment. The tubular cellulosic casings are well-suited for the manufacture of sausages and sausage-like products. The seams according to this invention have exceptionally high shear strength and wet strength.
Packham, D.<...Packham, D.<...
Price, G. J., Pastor, M. L., Towo, A. N., Ansell, M. P. and Packham, D. E., 2007. Shear strength at Sisal fibre-polyester resin interfaces: use of inverse gas chromatography to study pretreatment effects. Composite Interfaces ...
Fishing Forum : Utah Fishing Forum: Utah Fishing General: TM C&R TipsFishing Forum : Utah Fishing Forum: Utah Fishing General: TM C&R Tips
Lets put it this way... yes 80 lb braid and xxh rods get em to to the net quick- but have you ever caught a 50" tiger??? Probably not .... i have fished for these fish for yrs and neither have I .... because they are mistreated , and mis-handled allowing only a rare handfull to even reach that size. The shear strength of any tiger over 40 inches is heart dropping and intense , although short lived it is the most adrenaline pumping 60 second fight you can have in fresh water!!!!! These amazing fish exert extreme stress and WILL die when fought to long in warm water- it takes soooo much energy to move a mass that large . Ok so another issue with chasing these fiah without proper gear- the surroundings while fighting em - all it takes is one bush or log to shred 10 lb mono with a 20 lb fish running at the other end , now we have a tiger with a mouth full of trebles tthat will probably die shortly after from lack of food, or being stuck.into the cover that it ran into...not trying to puck a fight ...
Patents | Bureau of Economic GeologyPatents | Bureau of Economic Geology
A system for, and method of, orienting seismic energy sources and seismic energy receivers to yield discriminated horizontal and vertical shear modes. In one embodiment, the system includes: (1) an initial matrix representing wave energy produced by a selected seismic energy source and received by a selected seismic energy receiver, (2) a first transforming matrix that cooperates with the initial matrix to orient the selected seismic energy source with respect to the selected seismic energy receiver, and (3) a second transforming matrix that cooperates with the initial matrix to orient the selected seismic energy receiver with respect to the selected seismic energy source, the initial matrix thereby transformed into a successive matrix containing the discriminated horizontal and vertical shear modes.. ...
Shear Machine Price, China Shear Machine Price Manufacturers & Suppliers | Made-in-China.comShear Machine Price, China Shear Machine Price Manufacturers & Suppliers | Made-in-China.com
Shear Machine Price - Select 2017 high quality Shear Machine Price products in best price from certified Chinese Manual Shear Machine manufacturers, Steel Plate Shear Machine suppliers, wholesalers and factory on Made-in-China.com
Browsing by Author 45bea41c-4efc-463b-a638-24cc098f1487Browsing by Author "45bea41c-4efc-463b-a638-24cc098f1487"
Objectives. This study evaluated the effect of etching using 2% proanthocynidin-containing 10% phosphoric acid 2% PA/10% PhA vs. 35% phosphoric acid 35% PhA on immediate (IM) and 6-months (6 M) resin-enamel microshear bond ...
Shear deformation of bridgmanite and magnesiowüstite aggregates at lower mantle conditions | COMPRESShear deformation of bridgmanite and magnesiowüstite aggregates at lower mantle conditions | COMPRES
Rheological properties of the lower mantle have strong influence on the dynamics and evolution of Earth. By using the improved methods of quantitative deformation experiments at high pressures and temperatures, we deformed a mixture of bridgmanite and magnesiowüstite under the shallow lower mantle conditions. We conducted experiments up to about 100% strain at a strain rate of about 3 × 10−5 second−1. We found that bridgmanite is substantially stronger than magnesiowüstite and that magnesiowüstite largely accommodates the strain. Our results suggest that strain weakening and resultant shear localization likely occur in the lower mantle. This would explain the preservation of long-lived geochemical reservoirs and the lack of seismic anisotropy in the majority of the lower mantle except the boundary layers.. For full article click here. ...
COHERENCE 2001/2002COHERENCE 2001/2002
Pain is one of the most common symptom of disease, and is thought to be an indication of an underlying pathology, but in some patients it is not possible to identify a pathophysiological mechanism or to find a well-known disease or pathology as the underlying condition. The evaluation of the patient with pain is frequently complex, because pain is a perception rather than a sensation. Now the diagnosis of pain intensity is based on patient s interpretation of a sensation, emotional response, and associated behavior. Newly discovered signal transduction pathway which uses nitric oxide (NO) to modulate the function of the vascular smooth muscle cells through mechanical wall shear stress (WSS) mechanism. WSS is a linear function of the blood flow rate and is inversely related to the third power of the vessel radius. Wall shear stress is influence smooth muscle tone changing arterial lumen. In turn, the changes in arterial lumen regulate the shear stress. Such the arterial lumen is controlled by ...
Dr. Murrays Ultimate Antioxidant 60 Capsules, Natural Factors | VitaSprings.comDr. Murray's Ultimate Antioxidant 60 Capsules, Natural Factors | VitaSprings.com
Buy Discount Dr. Murrays Ultimate Antioxidant 60 Capsules, Natural Factors at VitaSprings. Find more product information on Dr. Murrays Ultimate Antioxidant and shop online.
Shear banding in entangled polymers in the micron scale gap: a confocal-rheoscopic study - Soft Matter (RSC Publishing)Shear banding in entangled polymers in the micron scale gap: a confocal-rheoscopic study - Soft Matter (RSC Publishing)
Recent shear experiments in well-entangled polymer solutions demonstrated that interfacial wall slip is the only source of shear rate loss and there is no evidence of shear banding in the micron scale gap. In this work, we experimentally elucidate how molecular parameters such as slip length, b, influence sh
What is Pump Shear and What Can We Do to Minimize it in Sanitary Pumps? | Holland Applied TechnologiesWhat is Pump Shear and What Can We Do to Minimize it in Sanitary Pumps? | Holland Applied Technologies
Shear is defined as relative motion between adjacent layers of a moving fluid. When one layer of a fluid moves adjacently to another layer of fluid, it can begin to exhibit the deleterious effects of shear. Shear rate is defined as the measure of the extent or rate of relative motion between adjacent layers of…
IMP: Integrative Multi-species PredictionIMP: Integrative Multi-species Prediction
GO:0034405. Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a fluid shear stress stimulus. Fluid shear stress is the force acting on an object in a system where the fluid is moving across a solid surface. ...
wind shear | meteorology | Britannica.comwind shear | meteorology | Britannica.com
wind shear: Rapid change in wind velocity or direction. A very narrow zone of abrupt velocity change is known as a shear line. Wind shear is observed both near the ground and in jet streams,...
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Shear StrengthMaterials TestingDental BondingOsseointegrationStress, MechanicalDental Stress AnalysisBone CementsSurface PropertiesMuscle StrengthTensile StrengthHand StrengthCompressive StrengthHemorheologyResin CementsMuscle Strength DynamometerFrictionLubricationPolymersPressureAdhesivesLeuconostocaceaeRutinGene Expression Regulation, BacterialBacterial ProteinsPortugalBibliometricsSan FranciscoNew MexicoArgonOrthodontic BracketsLaser TherapyNational Academy of Sciences (U.S.)LouisianaBentonitePhotoelectron SpectroscopyResearch ReportInstitute of Medicine (U.S.)Dental Atraumatic Restorative TreatmentGlass Ionomer CementsDentinDental EnamelNanotubes, CarbonNanostructuresNanotubesNanotechnologyAccess to InformationNanocompositesAcid Etching, DentalDentin-Bonding AgentsMembrane FluidityCell AdhesionAcaciaCell MovementFibronectins
Analytical and numerical approaches to estimate peak shear strength of rock joints | KTHAnalytical and numerical approaches to estimate peak shear strength of rock joints | KTH
Shear bond strength of dentin bonding agents cured with a Plasma Arc curing lightShear bond strength of dentin bonding agents cured with a Plasma Arc curing light
Glass-ionomer restoratives and liners: shear bond strength to dentin.<...Glass-ionomer restoratives and liners: shear bond strength to dentin.<...
Shear bond strength of different adhesives to Er:YAG laser-prepared dentin. | AVESİSShear bond strength of different adhesives to Er:YAG laser-prepared dentin. | AVESİS
Pulsatile blood flow, shear force, energy dissipation and Murrays LawPulsatile blood flow, shear force, energy dissipation and Murray's Law
Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models<...Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models<...
Effect of saliva on shear bond strength of an orthodontic adhesive used with moisture-insensitive and self-etching primers. -...Effect of saliva on shear bond strength of an orthodontic adhesive used with moisture-insensitive and self-etching primers. -...
New Tool to Improve Geotechnical Site Investigation - Research Highlights - Joint Transportation Research ProgramNew Tool to Improve Geotechnical Site Investigation - Research Highlights - Joint Transportation Research Program
Shear Strength of Vibration Welded Lap JointsShear Strength of Vibration Welded Lap Joints
CDC - Mining - Shear Strength Evaluation of Clay-Rock Mixtures - NIOSHCDC - Mining - Shear Strength Evaluation of Clay-Rock Mixtures - NIOSH
Shear strength - WikipediaShear strength - Wikipedia
Shear strength test - WikipediaShear strength test - Wikipedia
Laboratory shear strength of soil : a symposium (eBook, 1981) [WorldCat.org]Laboratory shear strength of soil : a symposium (eBook, 1981) [WorldCat.org]
Two-component, fast-curing adhesive features high shear and peel strength - Embedded.comTwo-component, fast-curing adhesive features high shear and peel strength - Embedded.com
PRIME PubMed | Effects of various methods of chlorhexidine application on shear bond strengthPRIME PubMed | Effects of various methods of chlorhexidine application on shear bond strength
Polymerization with the argon laser: curing time and shear bond strength.Polymerization with the argon laser: curing time and shear bond strength.
Use of Borehole Shear Test to Obtain Shear Strength Data Comparison to Direct Shear Test | SpringerLinkUse of Borehole Shear Test to Obtain Shear Strength Data Comparison to Direct Shear Test | SpringerLink
References | Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat | The National Academies PressReferences | Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat | The National Academies Press
Shear bond strengths of three glass ionomer cements to enamel and dentineShear bond strengths of three glass ionomer cements to enamel and dentine
Appendix B | Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat | The National Academies PressAppendix B | Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat | The National Academies Press
Grafting Carbon Nanotubes on Glass Fiber by Dip Coating Technique to Enhance Tensile and Interfacial Shear StrengthGrafting Carbon Nanotubes on Glass Fiber by Dip Coating Technique to Enhance Tensile and Interfacial Shear Strength
Epoxy adhesive / two-component / shear strength / industrial - 2000 series - THREE BONDEpoxy adhesive / two-component / shear strength / industrial - 2000 series - THREE BOND
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Shear StrengthMaterials TestingDental BondingOsseointegrationStress, MechanicalDental Stress AnalysisBone CementsSurface PropertiesMuscle StrengthTensile StrengthHand StrengthCompressive StrengthHemorheologyResin CementsMuscle Strength DynamometerFrictionLubricationPolymersPressureAdhesivesLeuconostocaceaeRutinGene Expression Regulation, BacterialBacterial ProteinsPortugalBibliometricsSan FranciscoNew MexicoArgonOrthodontic BracketsLaser TherapyNational Academy of Sciences (U.S.)LouisianaBentonitePhotoelectron SpectroscopyResearch ReportInstitute of Medicine (U.S.)Dental Atraumatic Restorative TreatmentGlass Ionomer CementsDentinDental EnamelNanotubes, CarbonNanostructuresNanotubesNanotechnologyAccess to InformationNanocompositesAcid Etching, DentalDentin-Bonding AgentsMembrane FluidityCell AdhesionAcaciaCell MovementFibronectins
DentinMean shear bond strengthBondWallsFrictionalSoilsDeformationTensionRigidityLocalizationNumericalPermeabilityMechanismDiameterResultsInterfacial Shear StrengthAnalysis of shearGlass ionomerApplication on shear bondSignificantlyCompare the shear bond strengthSpecimensTensile shear strengthEquipped for shear bondLower shear bond strengthHighest mean bondiDentin shear bondCementResinsDirect shear testsAffect the shearImparted shear stressFail in shearChlorhexidine applicationHigher shearMeasure shearMaximum shearConstant shearStatisticallySoilLabsCharacteristicsCompressionSoilsVitroBond strength was measuredAdhesionApparatusInfluenceUniversal TestingASTM D1002MetalsTriaxialEvaluationMeasurementsSurface treatmentsConclusionEnamel surfaceMechanical
Dentin5
Mean shear bond strength1
Bond5
Walls6
  • This law has also been derived from the hypothesis that the shear force of moving blood on the inner walls of vessels is constant throughout the vascular system. (nih.gov)
  • When a structure consists of walls (or frames) of varying heights tied together by a rigid diaphragm, the impact of the tall wall on the shear in the short wall, and vice versa, can be significant. (bentley.com)
  • The distribution of shear forces among these walls is not simply proportional to the cross-sectional properties at any given level. (bentley.com)
  • This shows that the distribution of the shear is not merely a function of the wall cross section at a level but is also a function of the loading and displacements of the walls above. (bentley.com)
  • Under these conditions the short walls pull shear out of the tall walls. (bentley.com)
  • The discussion of the behavior described above is valid for structures consisting of moment frames or braced frames, as well as for those consisting of shear walls. (bentley.com)
Frictional1
Soils3
  • Purdue University researchers have produced a new site investigation torque tool, known as SPT-T that can better characterize the soil and provide valuable data on shear strength, particularly for clay soils and glacial till. (purdue.edu)
  • The SPT has served as a simple test to estimate the relative density of soils and approximate shear strength parameters for engineers planning geotechnical structures such as foundation design and slope stability checks. (purdue.edu)
  • the torque is then related to the shear strength in these soils. (purdue.edu)
Deformation1
  • For example, it does not take into account the effects of shear deformation (a 1.2VH/AE term would be added to each side, where V is V A and V B , respectively). (bentley.com)
Tension1
Rigidity2
  • Our high strength materials combined with the new proprietary Process1800 produce an angle bottleneck capillary with superior strength and rigidity, even at very small tip diameters. (bita.lu)
  • If the diaphragm has insufficient strength or insufficient rigidity, the analysis performed by RAM Frame considering a rigid diaphragm is not valid for that structure. (bentley.com)
Localization2
  • However, the model offsets laboratory-derived strong weakening effects of talc observed in uniform mixtures, implying the governing mechanisms may be the shear localization effect of talc, which is enhanced by its natural platy shape or preimposed layered structure. (elsevier.com)
  • Reactivation-induced permeability increase is amplified with increased quartz content before the maturation of shear localization. (elsevier.com)
Numerical1
  • We conduct numerical shear experiments on mixtures of quartz and talc gouge using a three-dimensional (3D) distinct element model. (elsevier.com)
Permeability1
  • We follow the resulting evolution of ensemble shear strength, slip stability, and permeability of the gouge mixture and explore the mesoscopic mechanisms. (elsevier.com)
Mechanism1
  • A cellular mechanism that senses shear force at the inner wall of a blood vessel and triggers remodeling that increases the circumference of the wall when a shear force threshold is exceeded would result in the observed scaling of vessel radii described by Murray's Law. (nih.gov)
Diameter1
  • Increased shear strength allows Gaiser Tool Company to produce a more robust, high-strength, small tip diameter, angle-bottleneck capillary. (bita.lu)
Results1
  • Simulation results show that talc has a strong weakening effect on shear strength-a thin shear-parallel layer of talc (three particles wide) can induce significant weakening. (elsevier.com)
Interfacial Shear Strength4
  • The interfacial shear strength between Si microwires and a Nafion membrane has been tailored through surface functionalization of the Si. (caltech.edu)
  • The interfacial shear strength between the functionalized Si microwire surfaces and the Nafion matrix was quantified by uniaxial wire pull-out experiments in an in situ nanomechanical instrument that allowed simultaneous collection of mechanical data and visualization of the deformation process. (caltech.edu)
  • The shear strength between poly(methyl methacrylate) bone-cement and sand blasted cobalt-chromium and titanium alloy surfaces was measured to investigate the relationship between interfacial shear strength and surface topology. (niom.no)
  • We found that the interfacial shear strength is directly proportional to the exponent of the surfaces power spectra (P2) and Rdq, but not to Ra and Rr. (niom.no)
Analysis of shear3
Glass ionomer2
Application on shear bond2
Significantly12
Compare the shear bond strength2
Specimens9
Tensile shear strength1
Equipped for shear bond1
Lower shear bond strength1
Highest mean bondi1
  • The 10%55D sample group had the highest mean bonding shear strength at .5602 MPa, but to observe the aging stability of all sample groups, all combinations were used in Phase II. (calpoly.edu)
Dentin shear bond2
  • The purpose of this study was to evaluate the dentin shear bond strength of four adhesive systems (Adper Single Bond 2, Adper Prompt L-Pop, Magic Bond DE and Self Etch Bond) in regards to buccal and lingual surfaces and dentin depth. (scielo.br)
  • The objective of this study was to compare dentin shear bond strength (DSBS) of dentin bonding agents (DBAs) cured with a plasma arc (PAC) light curing unit (LCU) and those cured with a light emitting diode (LED) LCU. (koreamed.org)
Cement7
Resins3
  • To evaluate the shear bond strength of brackets fixed with different materials (two light-cured nanofilled low-viscosity resins - Transbond Supreme LV and Flow Tain LV and two light-cured traditional resins - Transbond XT and Transbond Plus Color Change) after 10 min and 24 h, and to evaluate the type of failure. (bvsalud.org)
  • Thus, the aim of the present study was to evaluate the shear bond strength (SBS) of brackets fixed with different materials (two light-cured nanofilled low viscosity resins - Transbond Supreme LV and Flow Tain LV and two light-cured traditional resins - Transbond XT (control) and Transbond Plus Color Change) after 10 minutes and 24 hours. (bvsalud.org)
  • In SBS, SD (11.63±2.07MPa) showed statistically lower bond strength than XT (15.16±4.68MPa) but both resins were in the clinically acceptable range. (nova.edu)
Direct shear tests3
Affect the shear1
Imparted shear stress1
  • This system enables us to study the flow induced changes in plasma membrane of a representative cancer cell line HeLa as the function of imparted shear stress and importantly, cell-substrate adhesion strength. (eurekaselect.com)
Fail in shear1
  • In general: ductile materials (e.g. aluminium) fail in shear, whereas brittle materials (e.g. cast iron) fail in tension. (wikipedia.org)
Chlorhexidine application1
Higher shear2
Measure shear1
  • Then, 4 samples in each sub-group were used to measure shear bond strength using Universal Testing Machine, and 1 sample was examined with Scanning Electron Microscope (SEM). (scirp.org)
Maximum shear1
  • Furthermore, the hypothesis that the maximum shear force during the cycle of pulsatile flow is constant throughout the arterial system implies that Murray's Law is approximately true. (nih.gov)
Constant shear2
  • To determine the implications of the constant shear force hypothesis and to extend Murray's energy cost minimization to the pulsatile arterial system, a model of pulsatile flow in an elastic tube is analyzed. (nih.gov)
  • In order to explore the origins of the invariance of the shear strength with PSD, we analyzed the connectivity, force transmission, and friction mobilization in terms of anisotropies, finding that the constant shear strength is due to a subtle compensation of anisotropies. (srkturkiye.com)
Statistically4
Soil6
  • Soil shear strength tests are used to determine the load on soil. (wikipedia.org)
  • The shear strength values obtained by DST and BST were similar, but the differences in the soil effective cohesion intercept parameter were more significant. (springer.com)
  • A conventional direct shear box was modified to accommodate the testing of an unsaturated soil. (environmental-expert.com)
  • The results illustrate the relationship between suction and shear strength for a glacial till soil. (environmental-expert.com)
  • The shear strength of an unsaturated soil and the soil-water characteristic curve are dependent on soil structure or the aggregation, which in turn is dependent. (environmental-expert.com)
  • The undrained peak and residual strengths are applicable to seismic stability evaluations of slopes comprised of or founded on cohesive soil. (environmental-expert.com)
Labs20
Characteristics1
  • We systematically controlled and varied the size span and the shape of the PSD, and found that the shear strength is independent of both characteristics. (srkturkiye.com)
Compression1
Soils5
  • Laboratory and field tests were performed to compare the parameters of shear strength of granite, migmatite, granulite, granitoid, gneiss and rhyolite residual soils from the Brazilian states of Santa Catarina and Rio de Janeiro. (springer.com)
  • American Society for Testing and Materials: ASTM D3080: Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions. (springer.com)
  • The paper describes a constant volume ring shear apparatus that allows the measurement of the undrained peak and residual shear strengths of cohesive soils. (environmental-expert.com)
  • No comments were found for Multistage Direct Shear Testing of Unsaturated Soils . (environmental-expert.com)
  • Covers theory, measurement and use of the fundamental properties of unsaturated soils--permeability, shear strength and volume change. (worldcat.org)
Vitro1
  • To evaluate, in vitro, the shear bond strength of self-curing (Concise TM - 3M and Alpha Plast - DFL) and light-curing composites (Transbond TM XT - 3M and Natural Ortho - DFL) used in orthodontics bonding, associated to Morelli metal brackets, with further analysis of adhesive remnant index (ARI) and enamel condition in scanning electron microscopy (SEM). (scielo.br)
Bond strength was measured2
Adhesion3
  • The friction coefficient of thin polymer sheets under high loads can be accounted for by a simple extension of the adhesion theory of friction in which the pressure dependence of the shear strength of the polymer is taken into consideration. (springer.com)
  • We have shown while transient changes in membrane fluidity depend on the orientation of flow and are largely independent of cellsubstrate adhesion landscape, long term membrane fluidization is controlled by the cell-substrate adhesion strength that is represented by maximum traction stress that cell exerts on the microchannel wall. (eurekaselect.com)
  • Tamal Das, Tapas K. Maiti and Suman Chakraborty, "Flow Shear Induced Changes in Membrane Fluidity: Dependence on Cell- Substrate Adhesion Strength", Current Analytical Chemistry (2013) 9: 9. (eurekaselect.com)
Apparatus2
  • Furthermore, most cutting experiments have been conducted using pendulum type apparatus or shearing rig, which may not fully represent the cutting process using reciprocating knives. (media.pl)
  • A force sufficient to shear the die from its mounting or equal to twice the minimum specified shear strength ( figure 2019-4 ), whichever occurs first, shall be applied to the die using the apparatus of 2 above. (xyztec.com)
Influence5
Universal Testing5
ASTM D10021
  • There are a variety of ASTM single-lap-joint shear tests including ASTM D1002 which specifies lap shear for metal to metal, ASTM D3163 for plastics joints, and ASTM D5868 for fiber reinforced plastics (FRP) against itself or metal. (ptli.com)
Metals1
  • The shear modulus in metals is typically within the range 20 000 to 150 000 MPa indicating a predicted shear stress of 3 000 to 24 000 MPa. (wikipedia.org)
Triaxial1
  • Comparison of Shear Strength Values Derived from Laboratory Triaxial, Borehole Shear, and Cone Penetration Tests. (springer.com)
Evaluation3
  • Evaluation of this body of knowledge has shown that the shear strength gradually increases with increasing percentages of floating particles in unsaturated clays. (cdc.gov)
  • Evaluation of Bond Strength of Tack Coat Materials in Field: Development of Pull-Off Test Device and Methodology. (nap.edu)
  • Evaluation of shear bond strength of zirconia-base. (who.int)
Measurements1
Surface treatments3
Conclusion3
Enamel surface1
  • On the other hand, in all the experimental groups in which the chlorhexidine varnish was applied as a layer on the etched enamel surface or over the sealant, shear bond strength values and bracket failure rates were of a magnitude that made them clinically unacceptable. (unboundmedicine.com)
Mechanical4
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