By using the transfer matrix renormalization group method, we studied the magnetic and thermodynamic properties of the uniform and the nonuniform quantum Heisenberg spin chain with S=12. Compared with experiment results of some compounds, we investigated the effects of different interactions...

A theoretical study of a mixed spin Ising system consisting of spin-1/2 and spin-1 with a random field is studied by the use of the finite cluster approximation within the framework of a single-site cluster theory. In this approach, the phase diagrams and magnetizations are investigated for the...

The specific heat and temperature dependence of magnetizations in transverse Ising thin films are investigated by the use of the standard mean-field theory and the effective-field theory with correlations. The exchange interaction and transverse field at the surfaces take values different from...

An established unified theory of the liquid–glass transition in one-component liquids is extended to multi-component liquids. The universal features such as the Kauzmann paradox, the Vogel–Tamman–Fulcher (VTF) law on the relaxation times and the transport coefficients, the jump of the...

The accurate determination of the thermal properties of biomass materials is particularly important when studying biomass combustion processes. This paper reports a method for the determination of the maximum sampling error and the confidence intervals of thermal properties obtained from...

In the present study, phase change materials based on epoxy resin paraffin wax with the melting point 27 °C were used as a new energy storage system. Thermophysical properties and the process of melting of a PCM (phase change material) composite were investigated numerically and...

The temperature dependence of the heat capacity Cv of the boson gas is studied within the generalized quantum statistics. The generalized heat capacity (Cv)q is shown to increase strongly at all temperatures with increasing nonextensive parameter q. This (Cv)q behavior is used to reproduce the...

The reduced s–d model with antiferromagnetically coupled impurity spins is tested on specific heat measurements of (La1−xCex)Al2 for varying Ce concentration c and magnetic field B. The s–d exchange coupling constant J, conduction bandwidth D and coupling between impurities γ2 are...

The reduced s-d model with antiferromagnetically coupled impurity spins, previously tested on susceptibility measurements of (La1−xCex)Al2, is applied to CePd2Ga3. The s-d exchange coupling constant J, and conduction bandwidth D are adjusted to obtain the best fit of theoretical specific heat...

Thermal conductivity of thin film is analyzed in this paper. It has been shown that at low temperatures, thermal conductivity of film is considerably lower than that of bulk structure. Also, the dependence of activation energy on boundary conditions has been investigated. It has been found that...