Results 221 to 230 of about 73,080 (268)
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Thermal aging: A new concept of skin aging
Journal of Dermatological Science Supplement, 2006Summary Background Sunlight damages human skin, resulting in a wrinkled appearance. Human skin temperature, measured inside the dermis by a needle-type thermometer, can be increased up to about 40 °C in direct summer midday sunlight within 15–20 min, and this heat may contribute significantly to sun-induced skin damage.
Jin Young Seo, Jin Ho Chung
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Ageing properties of thermally sprayed iron disilicide
XVI ICT '97. Proceedings ICT'97. 16th International Conference on Thermoelectrics (Cat. No.97TH8291), 2002The relation between the microstructure and the thermal and thermoelectric behaviour of thermally sprayed p- and n-type FeSi/sub 2/ has been investigated in order to identify process variations and operation conditions to obtain good thermoelectric properties.
Schackenberg, K. +5 more
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1965 Sixth Electrical Insulation Conference, 1965
We shall be concerned primarily with thermal endurance of the types of materials defined in NEMA Pub. No. LI 1-1965(1). It is our purpose to briefly review the contribution of the Industrial Laminate Section (NEMA) to the present knowledge of thermal stability of laminated, thermosetting plastics, and to discuss a program to provide further knowledge ...
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We shall be concerned primarily with thermal endurance of the types of materials defined in NEMA Pub. No. LI 1-1965(1). It is our purpose to briefly review the contribution of the Industrial Laminate Section (NEMA) to the present knowledge of thermal stability of laminated, thermosetting plastics, and to discuss a program to provide further knowledge ...
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Physical Review B, 1997
The contribution of surface vibrations to the thermal expansion of Ag(111) is analyzed at several levels of approximations. In the quasiharmonic scheme, the surface vibrational density of states, which may be represented fairly by modes at the high symmetry points in the surface Brillouin zone, do not lead to anomalously large thermal expansion, in ...
Abdelkader Kara +3 more
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The contribution of surface vibrations to the thermal expansion of Ag(111) is analyzed at several levels of approximations. In the quasiharmonic scheme, the surface vibrational density of states, which may be represented fairly by modes at the high symmetry points in the surface Brillouin zone, do not lead to anomalously large thermal expansion, in ...
Abdelkader Kara +3 more
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The thermal aging of filled polyurethane
Journal of Applied Polymer Science, 1991AbstractThermal aging and strain endurance experiments on a filled rubber were performed at several temperatures. The rubber was polyurethane (PU) made from hydroxyl‐terminated polybutadiene (HTPB) with 4,4′‐diphenyl methane disocyanate (MDI). The filler was sodium chloride.
Don Trong‐Ming +2 more
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Thermally activated ageing of polysilicon
Proceedings of IEEE Sensors, 2003Thermally induced resistance changes and long term stability of polysilicon resistors were characterized for temperatures up to 1400 K. For this purpose, a new test microstructure was developed which is based on a micro hotplate with a central polysilicon resistor as the material under test and two polysilicon heaters for temperature cycling of the ...
M. Ehmann +3 more
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Thermal Aging of Optically Silicones
Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT), 2014Silicone encapsulants are used for a variety of photonic and optoelectronic applications where they function as a photon guide to increase the device's functionality such as light output for an LED. The purposes range from light guides to increase signal strength, waveguides to increase viewing angles and to increasing the light output of an LED ...
Michelle Velderrain, Michelle Poliskie
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Thermal aging of molding compounds
2010 11th International Conference on Electronic Packaging Technology & High Density Packaging, 2010The mechanical properties of polymer encapsulating materials change considerably when packages are exposed to elevated temperatures for longer times. Here we report a systematic study on the change in viscoelastic properties of a commercial molding compound which is stored at 175°C for periods of time ranging up to 4 weeks.
K.M.B. Jansen +3 more
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Thermal aging of polyvinyl chloride
CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005., 2005This paper reports on the study of the thermal aging of the polyvinyl chloride used in high voltage cables. This study shows that thermal aging changes the electrical properties of the material. We notice that the higher the aging temperature is, the more important is the rate of degradation of the insulator.
M. Nedjar, A. Beroual, M. Bournane
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Proceedings., Second International Conference on Properties and Applications of Dielectric Materials, 2003
The results of thermal endurance tests performed on models of EPR (ethylene-propylene rubber) cables are presented. The problems of selecting the properties related to aging and their endpoints are discussed. A method for obtaining an objective failure criterion for different properties and a unique thermal endurance graph are described.
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The results of thermal endurance tests performed on models of EPR (ethylene-propylene rubber) cables are presented. The problems of selecting the properties related to aging and their endpoints are discussed. A method for obtaining an objective failure criterion for different properties and a unique thermal endurance graph are described.
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