Dielectric mixtures -- electrical properties and modeling

In this paper, a review on dielectric mixtures and the importance of the numerical simulations of dielectric mixtures are presented. It stresses on the interfacial polarization observed in mixtures. It is shown that this polarization can yield different dielectric responses depending on the properties of the constituents and their concentrations. Open question on the subject are also introduced.Comment: 40 pages 12 figures, to be appear in IEEE Trans. on Dielectric

A comparison of eager and lazy class initialization in Java

We prove that under some natural condition eager class initialization of a Java program P, as proposed in Kozen and Stillerman (2002), does not depend on the choice of a topological sort of the graph of class initialization dependencies of P. We also identify further natural conditions under which the eager and lazy class initializations of P assign the same initial values to the static fields of P. The latter result partially solves a problem raised in Kozen and Stillerman (2002)

What can one learn about Fe-Cr alloys using M\"ossbauer spectroscopy?

Applications of the M\"ossbauer spectroscopy (MS) in the investigation of Fe-Cr alloys are reviewed. A high sensitivity of the hyperfine magnetic field to the presence of Cr atoms in the vicinity of the probe Fe atoms permits quantitative investigation of various aspects related both to the crystallographic as well as to the magnetic phase diagram of this alloy system. Concerning the former, presented is the relevance of MS for determining borders of the miscibility gap and kinetics of the phase decomposition, distinguishing between nucleation and growth and spinodal decomposition, identifying the sigma-phase and studying kinetics of its precipitation. Regarding the magnetic phase diagram, MS is useful for determining the Curie, the N\'eel and the spin-freezing temperature, hence studying paramagnetic-ferromagnetic, paramagnetic-antiferromagnetic and paramagnetic-spin-glass transitions. An effect of different heat treatments, strain and irradiation with various particles on a distribution of Cr atoms in the Fe matrix is demonstrated, too. For bcc-FeCr alloys relevance of MS for determining changes in spin and charge densities at Fe-sites induced by neighboring Cr atoms is illustrated, as well as its usefulness in studying changes caused by a high-temperature sulphidation and oxidation. Concerning properties of sigma-FeCr alloys the application of MS for determining the Curie and Debye temperature is reviewed. Application of MS to study an effect of magnetism on the lattice dynamics of Fe atoms in sigma-FeCr is also exemplified. Last but not least, determining a magnetic texture and mechanical alloying is addressed.Comment: 98 pages, 78 figures, 3 tables, 160 reference