Subbarrier absorption in a stationary superlattice

The calculation of the interband absorption coefficient was carried out in the classical case, when the frequency of light was assumed to bind two miniband subbarrier states of different bands. The influence of two dimensional Mott excitons on this absorption was studied and a comparison was made with the experiment. All of these considerations were done taking into account the photon wave vector (the phase spatial heterogeneity). The basic traits of the energy spectra of superlattice semiconductors, their kinetic and optical properties, and possible means of electromagnetic wave intensification were examined. By the density matrix method, a theory of electrical and electromagnetic properties of superlattices was suggested

Взаимосвязь пальцевого индекса и развития предметно-познавательных способностей школьников

В настоящее время уделяют серьезное внимание антропологическому исследованию. Нами проведено исследование пальцевого индекса у школьников старших классов. В исследовании принимали участие 24 школьника, из них мальчиков - 10 и девочек - 14; средний возраст - 14,5 лет. Оказалось, что у большинства мальчиков пальцевой индекс ниже единицы. Школьницы с пальцевым индексом единица и выше единицы учатся лучше, занимаются активно спортом, интересуются танцами и музыкой. Однако, достоверной зависимости успехов по русскому языку от пальцевого индекса у школьников не обнаружено. Возможно, полученные данные связаны с маленькой выборкой исследуемого материал

Self-Adjointness of Generalized MIC-Kepler System

We have studied the self-adjointness of generalized MIC-Kepler Hamiltonian, obtained from the formally self-adjoint generalized MIC-Kepler Hamiltonian. We have shown that for \tilde l=0, the system admits a 1-parameter family of self-adjoint extensions and for \tilde l \neq 0 but \tilde l <{1/2}, it has also a 1-parameter family of self-adjoint extensions.Comment: 11 pages, Latex, no figur

Origin of second-harmonic generation in the incommensurate phase of K2SeO4

We show that a ferroelectric phase transition takes place in the incommensurate phase of the K2SeO4 crystal. The ferroelectric character of the IC phase explains the second-harmonic generation observed in the corresponding temperature range.Comment: 5 pages, 1 figur

Heat accumulation effects in laser processing of diamond-like nanocomposite films with bursts of femtosecond pulses

In this paper we have investigated the burst mode (BM) ablation and surface structuring of diamond-like nanocomposite (DLN) a-C:H:Si:O films with femtosecond laser pulses (wavelength λ=515 nm, pulse duration τ=320 fs, pulse repetition rate f=100 kHz) under different scanning conditions (single spots, linear structures). The pulse separation in the bursts is 25 ns (intra-burst frequency f=40 MHz) and the pulse number is varied from 1 to 8. The ablation depth and specific ablation rates (μm3/μJ) are found to be higher for the burst mode compared to single pulse irradiation, increasing with the pulse number in the burst. The obtained experimental data of the higher ablation efficiency are shown to correlate with computer simulations of the BM ablation. In correlation with the ablation findings, Raman spectra of single spots and microgrooves have evidenced a growing graphitization of amorphous film structure with the pulse number in the bursts (at equal energy deposited into the films). Contact-mode atomic force microscopy (AFM) is applied to reveal an influence of the BM processing on the surface properties (nanoscale relief, friction) of laser-structured films. Based on the ablation and Raman data analysis, AFM examination of ablated/redeposited layers and computer simulations of the burst mode ablation, the heat accumulation is identified as the main factor responsible for the enhanced ablation efficiency during the BM processing of DLN films. In addition, results of high precision surface microstructuring of DLN films in the burst mode are presented

Role of religious and cultural values in human capital

The study aims to investigate the role of religious and cultural values in human capital. The research is based on the sociological research method. As a result, the actual and perceived cohesion of the neighbors' matte

COMPARATIVE ANALYSIS OF EDUCATIONAL PROGRAMS ON SOCIAL ENTREPRENEURSHIP

Рассмотрены особенности образовательных программ по социальному предпринимательству в отечественной и зарубежной практике. Представлен опыт Северо-Кавказского федерального университета по реализации основных и дополнительных образовательных программ по социальному предпринимательствуThe features of educational programs on social entrepreneurship in domestic and foreign practice are considered. The experience of the North Caucasus Federal University on the implementation of basic and additional educational programs on social entrepreneurship is presente