Spin orientation by electric current in (110) quantum wells

We develop a theory of spin orientation by electric current in (110)-grown semiconductor quantum wells. The controversy in the factor of two from two existed approaches is resolved by pointing out the importance of energy relaxation in this problem. The limiting cases of fast and slow energy relaxation relative to spin relaxation are considered for asymmetric (110) quantum wells. For symmetricly-doped structures the effect of spin orientation is shown to exist due to spatial fluctuations of the Rashba spin-orbit splitting. We demonstrate that the spin orientation depends strongly on the correlation length of these fluctuations as well as on the ratio of the energy and spin relaxation rates. The time-resolved kinetics of spin polarization by electric current is also governed by the correlation length being not purely exponential at slow energy relaxation. Electrical spin orientation in two-dimensional topological insulators is calculated and compared with the spin polarization induced by the magnetic field.Comment: 8 pages, 2 figure

Chromatin from sperm of Bivalvia molluscs Specific features of nucleosomal organization

AbstractIn chromatin from the sperm of two Bivalvia molluscs a highly basic low molecular mass sperm-specific protein (S-protein) has been found in addition to the full complement of histones. It is shown that sperm chromatin preserves nucleosomal organization, some parameters of which are specific: (i) DNase I cuts DNA within the sperm nuclei with dinucleosomal periodicity; (ii) linker DNA of the nucleosome is significantly elongated. The S-protein is shown to be located on the linker DNA

Experience of machine vision application in optical NDT systems

Two automated optical inspection systems – for defects detection of in the ligature under UV irradiation and for non-destructive testing of pipeline inner surface – were described. The features of constructions and algorithms of the developed software with using the computer vision techniques were presented. Engineered systems were introduced successfully into commercial operation.Описаны две автоматизированные системы оптического контроля – для обнаружения дефектов в лигатуре под ультрафиолетовым облучением и для внутритрубной дефектоскопии поверхности. Представлены особенности конструкций и алгоритмы функционирования разработанного программного обеспечения с использованием методов технического зрения. Сконструированные системы успешно сданы в промышленную эксплуатацию