Results 241 to 250 of about 167,613,522 (302)

Ultraprecise Measurement of Thermal Coefficients of Expansion

Applied Optics, 1970
A novel method for determining thermal expansion coefficients has been devised. It is based on the dependence of Fabry-Perot resonances on the mirror separation. The expansion sample is formed into an etalon spacer, with highly reflecting endplates optically contacted to each end.
S F, Jacobs, J N, Bradford, J W, Berthold Iii   +2 more
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The coefficient of thermal expansion of stroma

Experimental Eye Research, 1971
Abstract Rabbit stroma has a negative coefficient of thermal expansion. Upon raising the temperature of a bare stroma, 200 μm thick, from 1–37°C while bathed in isotonic saline and loaded to 53 mmHg swelling pressure the thickness decreases about 14 μm. An increase in thickness of about the same amount can be observed upon cooling a bare stroma. This
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Thermal expansion coefficient of titanium casting

Journal of Oral Rehabilitation, 2001
A reliable measurement of the thermal expansion coefficient (α) value is required to achieve a positive thermal mismatch between metal and porcelain for porcelain‐fused to metal crowns. Heating rate and specimen conditions may significantly influence the α value and the effects of these factors were studied.
D, Low, T, Sumii, M, Swain
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Effect of coefficient of thermal expansion on microleakage

The Journal of the American Dental Association, 1988
This study examines the relationship between thermal coefficient of expansion and microleakage. Six restorative materials with varying coefficients of thermal expansion were thermocycled in basic fuschin dye and compared for relative microleakage. The use of dental restorative materials with low coefficients of thermal expansion such as glass ionomer ...
R H, Bullard, K F, Leinfelder, C M, Russell   +2 more
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Unexpected low thermal expansion coefficients of pentadiamond

Physical Chemistry Chemical Physics, 2022
Though pentadiamond is softer than diamond, the thermal expansion coefficients of pentadiamond are lower than those of diamond.
Mingqing Liao, Yi Wang, Fengjiang Wang, Jingchuan Zhu, Zi-Kui Liu   +4 more
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Negative Thermal Expansion Coefficient

2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON), 2019
Physical nature of negative thermal expansion coefficient ($\alpha$) in polar-sensitive dielectrics and semiconductors is explained. Physical features of inter-atomic bonds in crystals are manifested in their thermal expansion; in the polar dielectrics it is a peculiar polar-sensitive structure, arisen due to compensation of atoms electronegativity ...
Y.M. Poplavko, Y.V. Didenko, Y.I. Yakimenko   +2 more
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Nonlinearity of the coefficient of thermal expansion in brain tissue

Journal of the Mechanical Behavior of Biomedical Materials, 2021
The coefficient of thermal expansion (CTE) in biological tissues is an integral parameter behind the application of electromagnetic energy to biomedical technologies; however, its behavior is far from being fully characterized. In this study, we apply digital image correlation (DIC) to non-invasively measure the microscale thermal expansions of ...
Amy M. Dagro, Haoyang Li, Ann Mae DiLeonardi, James D. Hogan   +3 more
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On the identification of a thermal expansion coefficient

Inverse Problems in Science and Engineering, 2015
In this paper, we identify a time-dependent thermal expansion function when some information about the temperature is known. This inverse problem is motivated by models that arise in food engineering. In particular, the model studied here describes high-pressure processes and it is governed by the heat equation with Robin boundary conditions in a ...
J.A. Infante, M. Molina–Rodríguez, Á.M. Ramos   +2 more
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Thermal Expansion Coefficients of Bismuth

Journal of Applied Physics, 1960
The linear thermal expansion coefficients of the a and c axes of bismuth have been measured from 80°K to 540°K by mechanical means. These same coefficients were determined over a more limited range of temperatures by single crystal and powder x-ray methods. The mechanical and x-ray values did not differ significantly.
E. F. Cave, L. V. Holroyd
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Thermal Expansion Coefficient

1968
The bond lengths between segments of a polymer chain are virtually independent of temperature and impose restraints on the expansion which occurs as the temperature is raised. Polymer systems therefore have lower expansivities than related liquids which are not polymeric.
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