Results 71 to 80 of about 120,755 (193)

Casimir Energy and Entropy between perfect metal Spheres

, 2012
We calculate the Casimir energy and entropy for two perfect metal spheres in the large and short separation limit. We obtain nonmonotonic behavior of the Helmholtz free energy with separation and temperature, leading to parameter ranges with negative ...
Baltes H. P., Casimir H. B. G., Wittmann R. C.   +2 more
core   +1 more source

The high temperature expansion of the classical $XYZ$ chain

, 2006
We present the $\beta$-expansion of the Helmholtz free energy of the classical $XYZ$ model, with a single-ion anisotropy term and in the presence of an external magnetic field, up to order $\beta^{12}$. We compare our results to the numerical solution of
Baker, Bernu, Birgeneau, Büller, Delica, E.V. Corrêa Silva, Fisher, Granroth, Hutchings, James E.F. Skea, Jensen, Joyce, M.T. Thomaz, Mikeska, Moura-Melo, Onofre Rojas, Rojas, Rojas, Rojas, S.M. de Souza, Takahashi, Yamamoto   +21 more
core   +1 more source

A complete equation of state for polyethylene based on Helmholtz free energy

Acta Physica Sinica, 2017
Polyethylene (PE) is an important kind of plastic, which plays a significant role as the shell material of the fuel capsule, light weight structural element subjected to intense mechanical impact and explosion load. And it is well accepted that semi-empirical three-term equation of state (EOS) is one of the most widely used EOSs in practical work ...
null Zhang Xu-Ping, null Wang Gui-Ji, null Luo Bin-Qiang, null Tan Fu-Li, null Zhao Jian-Heng, null Sun Cheng-Wei, null Liu Cang-Li   +6 more
openaire   +1 more source

Quantum Spin-$1$ Anisotropic Ferromagnetic Heisenberg Model in a Crystal Field: A Variational Approach

, 2013
A variational approach based on Bogoliubov inequality for the free energy is employed in order to treat the quantum spin-$1$ anisotropic ferromagnetic Heisenberg model in the presence of a crystal field.
Carvalho, Diego da Cunha, Castro, Luizdarcy de Matos, Plascak, João Antônio   +2 more
core   +1 more source

A New Non-Extensive Equation of State for the Fluid Phases of Argon, Including the Metastable States, from the Melting Line to 2300 K and 50 GPa

Fluids
A new equation of state for argon was developed with the view of extending the range of validity of the equation of state previously proposed by Tegeler et al.
Frédéric Aitken, André Denat, Ferdinand Volino   +2 more
doaj   +1 more source

A Quantum Analogue of the Jarzynski Equality

, 2000
A quantum analogue of the Jarzynski equality is constructed. This equality connects an ensemble average of exponentiated work with the Helmholtz free-energy difference in a nonequilibrium switching process subject to a thermal heat bath.
Crooks G. E., Gallavotti G., Gallavotti G., Hatano T., Jarzynski C., Jarzynski C., Kubo R., Reimann P., Tatara G., Yukawa S.   +9 more
core   +1 more source

The effective potential of N-vector models: a field-theoretic study to O(\epsilon^3)

, 1999
We study the effective potential of three-dimensional O($N$) models. In statistical physics the effective potential represents the free-energy density as a function of the order parameter (Helmholtz free energy), and, therefore, it is related to the ...
Andrea Pelissetto, Antonenko, Avdeev, Bagnuls, Baker, Baker, Baker, Balog, Boos, Broadhurst, Broadhurst, Broadhurst, Brézin, Brézin, Butera, Butera, Campostrini, Campostrini, Campostrini, Campostrini, Chetyrkin, Chung, Davydychev, Davydychev, des Cloizeaux, des Cloizeaux, Ettore Vicari, Griffiths, Guida, Guida, Hasenbusch, Heap, Josephson, Katsura, Kim, Le Guillou, Le Guillou, Lewin, Lipa, Lipatov, McKenzie, Nickel, Nicoll, Parisi, Pelissetto, Pelissetto, Pelissetto, Pisarski, Reisz, Schofield, Schofield, Sokolov, Sokolov, Sokolov, Stroesser, Tetradis, Tkachov, Tsypin, Wallace, Wilson, Zinn, Zinn-Justin   +61 more
core   +2 more sources

Effects of thermal fluctuations on non-minimal regular magnetic black hole

European Physical Journal C: Particles and Fields, 2017
We analyze the effects of thermal fluctuations on a regular black hole (RBH) of the non-minimal Einstein–Yang–Mill theory with gauge field of magnetic Wu–Yang type and a cosmological constant.
Abdul Jawad, M. Umair Shahzad
doaj   +1 more source

Kelvin-Helmholtz instability of a coronal streamer

, 2013
The shear-flow-driven instability can play an important role in energy transfer processes in coronal plasma. We present for the first time the observation of a kink-like oscillation of a streamer probably caused by the streaming kinkmode Kelvin-Helmholtz
Feng, Li, Gan, Weiqun, Inhester, Bernd
core   +1 more source

On equivalence of high temperature series expansion and coupling parameter series expansion in thermodynamic perturbation theory of fluids

, 2014
The coupling parameter series expansion and the high temperature series expansion in the ther- modynamic perturbation theory of fluids are shown to be equivalent if the interaction potential is pairwise additive. As a consequence, for the class of fluids
Ramana, A. Sai Venkata
core   +1 more source