Thermal expansionbulk modulusquasiharmonicanharmonicelectron–phonon"Quasi-harmonic" (QH) theory should not be considered a low-order theory of anharmonic effects in crystals, but should be recognized as an important effect separate from "true" anharmonicity. The original and widely used meaning of ...
The Grüneisen theory of thermal expansion as formulated by Born and Huang has been modified by including higher-order terms for the change in volume in the expansion of potential energy. New expressions are obtained for the thermal expansivity and bulk modulus, and used to estimate these ...
which gives a measure of the ratio between the viscous losses and the thermal losses in a system. For air, this number is 0.7, while it is around 7.1 for water. In air, the thermal and viscous effects are roughly equal in importance, while for water (and most other fluids), the therm...
ELECTRON THEORY ON THERMAL EXPANSION OF SOLIDS AND ITS APPLICATION TO LIGHT METALSsolid thermal expansion electron theory.In first-order approximation, the interaction potential function among atoms in solidsmay be expressed aswhere gα depends on the electron structures of solids; rα and rαo ...
The thermal properties of δ -plutonium are studied in terms of the elementary electronic structure, and contrasted to those of aluminum. In both metals the thermal expansion can be understood as from the pressure of the gas of phonons, a negative expansion in the case of plutonium because of...
Crystals and glasses exhibit fundamentally different heat conduction mechanisms: the periodicity of crystals allows for the excitation of propagating vibrational waves that carry heat, as first discussed by Peierls, while in glasses the lack of periodici
In this work, the thermal expansion behavior and the structure configuration evolution of glasses were studied. Degree of freedom based on the topological constraint theory is correlated with configuration evolution; considering the chemical composition and the configuration change, the analytical equation ...
aAlternate Payor 备选的付款人[translate] aIn addition, no one has yet established an analytical theory for the thermal expansion coefficient of DNA biofilm absorbed on microcantilever. 另外,没人建立了一种分析理论为在microcantilever吸收的脱氧核糖核酸biofilm热扩散系数。[translate]...
37Thermal ExpansionLeverage the expansion and contraction of materials due to temperature changes for mechanical advantage. 38Strong Oxidants & Inert EnvironmentControl the environment’s oxidation levels to prevent or enhance reactions. 39Inert AtmosphereModify the surrounding environment to reduce or elimina...
The field (geometrical) theory of specific heat is based on the universal thermal sum, a new mathematical tool derived from the evolution equation in the Euclidean four-dimensional spacetime, with the closed time coordinate. This theory made it possible to explain the phenomena of scaling in the...