Cluster expansion for the description of condensed state: crystalline cell approach

A well-known cluster expansion, which leads to virial expansion for the free energy of low density systems, is modified in such a way that it becomes applicable to the description of condensed state of matter. To this end, the averaging of individual clusters over the states of an ideal gas is replaced by the averaging over the states of a non-correlated crystal using single-particle cell potentials. As a result, we arrive at the expansion of the partition function in correlations on the basis of single-particle functions corresponding to the multiplicative approximation. The cell potentials defining these functions are found from the condition of the minimum of the remainder in the constructed decomposition.Comment: 16 page

Bottom-Up Diversity of Foreign Language Courses

Bottom-Up Diversity is a key to minimize the negative consequences of the top-down Ministry decision to shrink foreign language courses

Teacher development-focused INSET course sample materials and procedures

Teacher development is considered as a concept denoting a teacher’s personal and professional self-improvement, and a movement promoting this self-improvement, as a lifelong process of learning and renewal. In order to stimulate the teacher’s self-paced lifelong growth the author suggests some samples of tasks of our INSET course.Професійне вдосконалення розглядається як концепт, пов'язаний з власним та професійним вдосконленням та процес, який веде до самовдосконалення. Цей процес продовжується протягом всього життя, як процес навчання та оновлення. Для стимулювання цього процесу автор пропонує деякі зразки завдань для курсів підвищення кваліфікації викладачів англійської мови

Self-access as a source of teacher development

The author describes the work of a self-access within the resource centre for pre-service and in-service English teachers

Communicative Learning Tasks for the ESP Course “English for Banking”

Communicative Learning Tasks for the ESP Course “English for Banking” is an attempt to promote and motivate learning English for Specific Purposes

The effect of short-range interaction and correlations on the charge and electric field distribution in a model solid electrolyte

A simple lattice model of a solid electrolyte presented as a xy-slab geometry system of mobile cations on a background of energetic landscape of the host system and a compensating field of uniformly distributed anions is studied. The system is confined in the z-direction between two oppositely charged walls, which are in parallel to xy-plane. Besides the long-range Coulomb interactions appearing in the system, the short-range attractive potential between cations is considered in our study. We propose the mean field description of this model and extend it by taking into account correlation effects at short distances. Using the free energy minimization at each of z-coordinates, the corresponding set of non-linear equations for the chemical potential is derived. The set of equations was solved numerically with respect to the charge density distribution in order to calculate the cations distribution profile and the electrostatic potential in the system along z-direction under different conditions. An asymmetry of charge distribution profile with respect to the midplane of the system is observed. The effects of the short-range interactions and pair correlations on the charge and electric field distributions are demonstrated

New directions in lexical semantics: a dynamic construal approach

The author of the article intends to single out basic features of the dynamic construal approach and show some applications. When you are citing the document, use the following link

Simplifying Materials

It is dealt with the ways of preparing tailored materials