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Showing 1 to 20 of 192 for “"Mechanical stress"”.
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Mechanical stress and stress compensation in Hall sensors
… the Hall sensor's sensitivity through the use of mechanical stress feedback and magnetic feedback.
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Phosphatase Regulation of Mechanical Stress and Aging in C. elegans
Stress and aging embody two related processes driving cellular dysfunction. In either case, environmental stimuli and genetically encoded regulatory mechanisms affect cellular homeostasis and influence adaptation. Phosphatases represent master regulators of stress signaling and modulate cellular …
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Electrical and mechanical stress responses for carbon black loaded rubber
… parameters (resistance, capacitance) and mechanical parameters (stress, strain) for carbon black loaded rubber. Resistance and capacitance were measured under constant strain and constant stress conditions in an effort to determine these relations for rubber filled with 30 to 70 parts …
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Thermo-mechanical stress measurement and analysis in three dimensional interconnect structures
… CTE mismatch between Silicon and Copper, thermal stresses are induced by various thermal histories from the device processing, and they have caused serious concerns regarding the thermal-mechanical reliability. Firstly, a semi-analytic approach is introduced to understand stress distributions in …
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Role of Mechanical Stress, Excipients and Coprocessing On Tablet Mechanical Properties
… speed and powder co-processing on tablet mechanical properties. In the first chapter, the effect of compression speed on compressibility, tabletability, and compactibility profiles of various materials was explored. The advantage of utilizing a compactibility profile in reducing the effect …
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Nonlinear heat transfer and thermo mechanical stress analysis using finite elements.
… procedures for the heat transfer and thermo-mechanical analysis of sol id continua. Steady state conduction heat transfer is developed as a particular case of the general field equation. Internal heat generation and the boundary conditions of specified temperatures, flux, convection. and …
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Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum
Stress relief of materials produced in bulk is a key part of the manufacturing process. The most common kinds are either thermal or mechanical and are commonly applied to commercial metal alloys. A third type, thermo-mechanical, utilizes thermal gradients to induce residual stresses of an equal and …
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Surface and mechanical stress effects in AlGaN/GaN high electron mobility transistors
… GaN is a piezoelectric material, and changes in mechanical stress result in a change in the charge density which in turn affects the maximum current in AlGaN/GaN transistors. Finite element modelling techniques were applied to quantify the mechanical stress distribution in planar AlGaN/GaN RF …
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Optical Coherence Tomography for the Assessment of Skin Adaptation to Repetitive Mechanical Stress
… Breakdown is caused most commonly by repetitive mechanical stresses that are imposed on the residual limb at its interface with the prosthetic socket. Skin can adapt to become more tolerant to these stresses, thus reducing the risk of breakdown, yet little is understood about this phenomenon and …
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Defining the Relationship Between Mechanical Stress and Inadvertent Intestinal Tissue Injury In Laparoscopic Surgery
… that delineates what range of compressive stress would allow a surgeon to both operate effectively and limit the potential for tissue trauma to occur. To ameliorate this, two novel compression devices were created to produce discrete and even amounts of pressure on ex-vivo human …
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The effect of work related mechanical stress on the peripheral temperature of the hand
… related upper limb disorders. A set of objective mechanical provocation tests for the hands have been developed that are associated with vascular challenge. Infrared thermal imaging was used to monitor the temperature changes using a well defined capture protocol. Normal reference values have been …
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Adaptive changes in the morphology of natural materials due to alterations in mechanical stress
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Rapid Rac GTP-ASE activation in live cells by mechanical stress is independent of Src
It is well-known that mechanical forces are crucial in regulating functions of every tissue and organ in a human body. However, it remains unclear how mechanical forces are transduced into biochemical activities and biological responses at the cellular and molecular level. Using the magnetic …
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Investigation of the electrical characteristics of GaAsP light-emitting diodes (LED's) under conditions of mechanical stress
The main line pursued is the mechanical stressing of light-emitting diodes (LED's) by pressing on the surface with spherically rounded sapphire probes ranging from 100 μm to 500 1m radius of curvature and with forces up to 50 grams weight on the largest probe, care being taken not to exceed the …
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Optimization of Bonding Geometry for a Planar Power Module to Minimize Thermal Impedance and Thermo-Mechanical Stress
… module with low thermal impedance and thermo-mechanical stress for high density integration of power electronics systems. With the development semiconductor technology, the heat flux generated in power device keeps increasing. As a result, more and more stringent requirements were imposed on …
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The effect of mechanical stress on the stiffness of articular cartilage and its role in the aetiology of osteoarthrosis
… its aetiology and in particular the role that mechanical factors play, remains unclear. One particular hypothesis suggests that cartilage adapts mechanically so that it may transmit, without sustaining damage, the stresses to which it is predominantly subjected, and that damage to the cartilage …
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INVESTIGATING THE ROLE OF LIPID DROPLETS AS INTRACELLULAR MECHANICAL STRESSORS IN NON-ALCOHOLIC FATTY LIVER DISEASE
Matrix stiffening and external mechanical stress have been linked to disease and cancer development in multiple tissues, including the liver, where cirrhosis (which increases stiffness markedly) is the major risk factor for hepatocellular carcinoma (HCC). Stiffness is correlated with cancer …
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SURVIVING UNDER PRESSURE: TRANSLATIONAL REWIRING IN RESPONSE TO MECHANICAL STIMULI
An outcome of high mechanical stress in the context of hyperproliferation and increased cellular tension is the reduction in cell volume, that holds the potential to impact cellular density. Both cell size and density homeostasis are integral features of healthy tissues, intricately linked to the …
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Dielectric reliability in GaN metal-insulator-semiconductor high electron mobility transistors
… the gate dielectric. Under prolonged electrical stress, the gate dielectric suffers a catastrophic breakdown that renders the transistor useless. Understanding the physics behind gate dielectric breakdown and accurately estimating the average time to failure of the dielectric are of critical …
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