Results 221 to 230 of about 272,610 (265)
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Kinetic Energies in Quantum Solids
Physical Review Letters, 1985We show that the recently measured kinetic energy of atoms in solid helium is substantially larger than expected for even a moderately anharmonic solid. The large kinetic energy is rather an explicit measure of the highly anharmonic nature of solid helium.
, Moleko, , Glyde
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Kinetic Energy and the Stable Set
Qualitative Theory of Dynamical Systems, 2010A classical result of Lagrange-Dirichlet states that in the theory of \(C^k\) mechanical systems, \(k\geq 2\), the strict minimum point for the potential energy \(\pi(q)\) is necessarily stable in the sense of Lyapunov. The first author and \textit{S. V.
Bortolatto, R. B. +2 more
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Energy transfer and kinetics in mechanochemistry
Environmental Science and Pollution Research, 2017Mechanochemistry (MC) exerts extraordinary degradation and decomposition effects on many chlorinated, brominated, and even fluorinated persistent organic pollutants (POPs). However, its application is still limited by inadequate study of its reaction kinetic aspects.
Zhiliang, Chen +5 more
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Testing the kinetic energy functional: Kinetic energy density as a density functional
The Journal of Chemical Physics, 2003A new method for defining an energy density for the noninteracting kinetic energy of density functional theory is given. The resulting energy density is a density functional determined completely by the kinetic energy functional itself. Although this method is not constructive, it allows for a direct comparison between exact and approximate functionals
Eunji Sim +3 more
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Kinetic energy of an electron gas
Physical Review B, 1985We derive a simple expression for the correlation part of the kinetic energy of an inhomogeneous electron gas from density-functional theory. We show that in the local density approximation, this expression reduces to the virial theorem result ${t}_{\mathrm{xc}}=3{v}_{\mathrm{xc}}\ensuremath{-}4{\ensuremath{\epsilon}}_{\mathrm{xc}}$. We also derive the
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The Kinetic Energy of Polyatomic Molecules
Physical Review, 1934The Lagrangian and Hamiltonian expressions for the kinetic energy of a system of $N$ particles are obtained in such a form that the rotational, vibrational and coupling terms may be distinguished. The principal axes of inertia are used to define rotation.
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Journal of Molecular Structure: THEOCHEM, 1992
Abstract The concept of kinetic energy densities has been discussed, with particular emphasis on the expression that may be derived from the Weyl-Wigner phase-space representation of quantum mechanics. The actual form of this expression, and of three other expressions for the kinetic energy density, has been calculated and plotted for the atoms ...
Jens Peder Dahl, Bjarne Amstrup
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Abstract The concept of kinetic energy densities has been discussed, with particular emphasis on the expression that may be derived from the Weyl-Wigner phase-space representation of quantum mechanics. The actual form of this expression, and of three other expressions for the kinetic energy density, has been calculated and plotted for the atoms ...
Jens Peder Dahl, Bjarne Amstrup
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Aircraft Engineering and Aerospace Technology, 1938
A LITTLE more than two years ago—in August, 1936, to be precise—we published an Aeronautical Research Committee report going back to the fundamentals of engine cooling and providing a theoretical basis for the low velocity cooling used in the ducted radiators which had then just made their first appearance in the Hurricane and Spitfire monoplanes for ...
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A LITTLE more than two years ago—in August, 1936, to be precise—we published an Aeronautical Research Committee report going back to the fundamentals of engine cooling and providing a theoretical basis for the low velocity cooling used in the ducted radiators which had then just made their first appearance in the Hurricane and Spitfire monoplanes for ...
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Kinetic energy as a perturbation
Physical Review C, 1982The potential energy V is taken as the unperturbed Hamiltonian and the kinetic energy K is used as the perturbation. As K is a semi-positive definite operator, one may use standard Pade approximants to reconstruct the Brillouin-Wigner functional. It is shown that, while the bare projector (E-V)/sup -1/ is plagued in the complex E plane by the cut which
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A hybrid kinetic energy harvester for applications in electric driverless buses
International Journal of Mechanical Sciences, 2022Ali Azam, Dabing Luo, Zutao Zhang
exaly