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A discussion of some concepts in thermal aging test-thermal aging and thermal breakdown
ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132), 2002Based on the experimental and analytical research results, the thermal stress preprocess and its performance in a thermal aging test should be divided into two distinct physical phases: thermal aging (TA) and thermal breakdown (TB). This paper presents firstly the definitions of TA, TB, and some related concepts in a thermal aging test for winding ...
null Hongyu Wang, R. Busch
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Thermal aging of polychloroprene
Journal of Polymer Science, 1961AbstractThe aging of polychloroprene has been studied at normal and elevated temperatures in air, in oxygen, and in nitrogen. A comparison of the molecular weight distribution curves for fresh specimens and for specimens aged under various conditions showed that on aging the polymer becomes heterogeneous.
I. Kössler, B. Matyska, J. Poláček
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Thermally-Induced Cutaneous Vasodilatation in Aging
Journal of Gerontology, 1993A decrease in heat-induced cutaneous vasodilatation has been implicated as the cause of increased heat stress in the elderly. We used laser Doppler techniques to study the skin blood flow response to local heat in 82 healthy volunteers. There were 39 young volunteers, mean age 29 +/- 1, and 43 elderly volunteers, mean age 76 +/- 1.
E, Evans +6 more
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Thermal ageing of cellulose paper insulation
1976 IEEE International Conference on Electrical Insulation, 1976Results are presented of investigations into the thermal ageing behavior of cellulose paper insulation in which tests have been carried out between 100C and 160C on well-dried samples of cellulose paper contained in sealed glass vessels in an atmosphere of initially dry nitrogen gas.
W. G. Lawson, M. A. Simmons, P. S. Gale
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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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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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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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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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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 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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