Influence of relaxation on propagation, storage and retrieving of light pulses in electromagnetically induced transparency medium

By solving the self-consistent system of Maxwell and density matrix equations to the first order with respect to nonadiabaticity, we obtain an analytical solution for the probe pulse propagation. The conditions for efficient storage of light are analyzed. The necessary conditions for optical propagation distance has been obtained.Comment: 7 pages, 7 figure

Wiggler Magnet Optimization for Linear Collider Damping Ring

Optimization results of a permanent magnet wiggler by 3D field calculation are shown. The developed model of optimization provides significant decreasing of field nonlinearity in a wiggler gap. Proposed wiggler optimization is executed on the example of a TESLA damping ring (DR) and can be used at designing of ILC DR

Current-biased Transition-edge Sensors Based on Re-entrant Superconductors

Transition-edge sensors are widely recognized as one of the most sensitive tools for the photon and particles detection in many areas, from astrophysics to quantum computing. Their application became practical after understanding that rather than being biased in a constant current mode, they should be biased in a constant voltage mode. Despite the methods of voltage biasing of these sensors are well developed since then, generally the current biasing is more convenient for superconducting circuits. Thus transition-edge sensors designed inherently to operate in the current-biased mode are desirable. We developed a design for such detectors based on re-entrant superconductivity. In this case constant current biasing takes place in the normal state, below the superconducting transition, so that following the absorption of a photon it does not yield a latching. Rather, the sensor gains energy and shifts towards the lower resistant (e.g., superconducting) state, and then cools down faster (since Joule heating is now reduced), and resets in a natural way to be able to detect the next photon. We prototyped this kind of transition edge sensors and tested them operational in accordance with the outlined physics. The samples used in experiments were modified compositions of YBCO-superconductors in a ceramic form (which, as we discovered, reproducibly demonstrates re-entrant superconductivity). In this presentation we report their composition, methods of preparation, and the detection results. This approach, in some areas, may have practical advantage over the traditional voltage-biased devices

The contents, forms and methods of family upbringing studying based on the differentiated approach

© 2016 by iSER, International Society of Educational Research. Relevance of research of this problem caused by the fact that the combination of various forms of work with different families helps to achieve mutual understanding in education of children who have difficulties in adapting in the changing world. Therefore, this article is devoted to disclosure the contents, forms and methods of family education studying based on the differentiated approach. The differentiated approach was based on allocation of groups of the families united by the same parameters. We chose pedagogical means adequate to families with various level of psychological and pedagogical culture. The essential moment was the unacceptability of standardization and unification of work with a family. Materials of the article can be useful for students of pedagogical specialties, for teachers of vocational education and training, and for parents as well