نتایج جستجو برای: thermal damage
تعداد نتایج: 439025 فیلتر نتایج به سال:
The impacts of temperature on the surface thermal damage of rock salt, gypsum and mudstone from the Yingcheng salt mine, China were investigated by the surface crack growth and propagation tests at different temperatures. We found that: (a) high temperature could strengthen the rock salt molecular thermal motion and weaken the cohesion among the rock salt grains, so that the grain boundaries we...
As 3D chip multi-processors (3D-CMPs) become the main trend in processor development, various thermal management strategies have been recently proposed to optimize system performance while controlling the temperature of the system to stay below a threshold. These thermal-aware policies require the envision of high-level models that capture the complex thermal behavior of (nano)structures that b...
Simple Nb(2)O(5), ZrO(2), SiO(2) oxide coatings and their mixtures with SiO(2) have been prepared by the Ion Beam Sputtering (IBS) technique. The Laser-Induced Damage of these samples has been studied at 1064 nm, 12 ns. The laser induced damage threshold (LIDT) decreases in both sets of the mixtures with the volumetric fraction of high index material. We find that the nanosecond LIDT of the mix...
Porcine ureters were anastomosed using an albumin stent and diode laser in vitro. The albumin stent provided precise apposition for an end to end anastomosis and enhanced welding strength. The anastomosis seam was lasered with an 810 nm diode laser using continuous wave and pulse light through a hand-held 600 μm noncontact optical fiber. Tensile strength, burst pressures, operative times, total...
BACKGROUND AND OBJECTIVE We present a new theory of selective thermal damage of non-uniformly pigmented structures in biological tissues. Spatial separation of the heavily pigmented areas and the target requires limitation of the pigment temperature and heat diffusion from the pigmented to the targeted areas. STUDY DESIGNS/MATERIALS AND METHODS A concept of selective target damage by heat dif...
The time-temperature effects of laser radiation exposure are investigated as a function of wavelength. Here, we report the thermal response of bulk tissue as a function of wavelength from 700 to 1064 nm. Additionally, Monte Carlo simulations were used to verify the thermal response measured and predict damage thresholds based on the response.
A method is presented to quantify thermal fatigue in the CPV die-attach from meteorological data. A comparative study between cities demonstrates a significant difference in the accumulated damage. These differences are most sensitive to the number of larger (ΔT) thermal cycles experienced for a location. High frequency data (<1/min) may be required to most accurately employ this method.
[1] The Uganik Thrust is a fossil out-of-sequence thrust fault which was active over a period of 3 Ma during the early Tertiary until activity ceased with the subduction of the Kula-Farallon spreading ridge at 57 Ma. During this period the fault experienced at least 1 km of throw and developed a strongly asymmetric damage zone. The brittle damage zone in the footwall of the fault acted as a con...
In 12 cows, transvaginal interstitial laser treatment (TILT) of the ovaries was performed using a neodynium:yttrium aluminium-garnet laser to investigate the feasibility of a new treatment approach for clomiphene-resistant patients with chronic hyperandrogenic anovulation. Powers of 1 and 2 W during 5 min of exposure were used. Sonographic changes of thermal damage during TILT, the extent and h...
The objective of this study is to propose a numerical model of thermal damage to the skin. This model simulates the propagation of a burn and suggests treatments to prevent it from spreading. In order to achieve this goal, we developed a 3D multi-layer finite element model of the skin coupled with a model presenting hyperthermic damage. The numerical model of the skin takes account of not only ...
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