The cluster effective-field approximation was proposed as a useful approximation for the study of frustrated Ising models. In order to examine its usefulness, the Ising model with frustration on the centred square lattice is studied in the square effective-field approximation, and the results...

For the purpose of revealing the rather complicated thermodynamic surface of ordinary water substance in the critical region, a series of measurements of the PVT properties and the vapor-pressures of this technically important fluid have been performed by means of a constant-volume method....

A method of an image recovery was proposed in a preceding paper, where the determination of a pair of parameters was not definite. Methods of determining the parameters are proposed.

We construct a two-country model with national and multinational (multiplant) firms and we investigate the effect of trade integration on welfare both at the country and at the aggregate level. When national and multinational firms coexist in equilibrium, results crucially depend on the share of...