Second Harmonic Generation in Periodically Poled Silica Fibers

AbstractProcesses of second harmonic generation in periodically poled germanosilicate fibers were investigated. Dependences of second harmonic generation efficiency on the fundamental radiation characteristics, optical fibers parameters and applied voltage were calculated

Elimination of 0+0^+ spurious states in the quasiparticle time blocking approximation

The quasiparticle time blocking approximation (QTBA) is considered as a model for the description of excitations in open-shell nuclei. The QTBA is an extension of the quasiparticle random phase approximation that includes quasiparticle-phonon coupling. In the present version of the QTBA, the pairing correlations are included within the framework of the BCS approximation. Thus, in this model, the $0^+$ spurious states appear, which are caused by the breaking of the symmetry related to the particle-number conservation. In this work, the method is described which solves the problem of the $0^+$ spurious states in the QTBA with the help of the projection technique. The method is illustrated by calculations of $0^+$ excitations in $^{120}$Sn nucleus.Comment: 12 pages, 3 figures - To appear in the proceedings of the 59-th International Meeting on Nuclear Spectroscopy and Nuclear Structure, June 15-19, 2009, Cheboksary, Russi

Interaction of the single-particle and collective degrees of freedom in non-magic nuclei: the role of phonon tadpole terms

A method of a consistent consideration of the phonon contributions to mass and gap operators in non-magic nuclei is developed in the so-called g^2 approximation, where g is the low-lying phonon creation amplitude. It includes simultaneous accounting for both the usual non-local terms and the phonon tadpole ones. The relations which allow the tadpoles to be calculated without any new parameters are derived. As an application of the results, the role of the phonon tadpoles in the single-particle strength distribution and in the single-particle energies and gap values has been considered. Relation to the problem of the surface nature of pairing is discussed.Comment: 22 pages, 7 figure

Control of the functional state of organism of sportsmen-youths in educational training process with the use of telemetric system.

The purpose of this work is upgrading educational training process on the basis of the use of facilities of complex operative control. 18 skiers of racing drivers took part in research. The telemetric system is developed for the estimation of the functional state of organism (frequencies of heart-throbs, breathing frequency, temperature of body). The algorithm of training process is presented. The method of account of individual reactions of the system of oxygen providing and utilizations of oxygen is offered in the organism of sportsman. Directions individualization of training of sportsman are shown

Monitoring technologies at employment tae kwon do WTF and bodybuilding.

For studying of physical development and physical readiness of pupil, complex research of 2838 boys of 6-10 years of comprehensive schools of Irkutsk were conducted. 171 tested pupils were engaged in group of bodybuilding and 342 tested in tae kwon do. It is established that additional employment tae kwon do promote development and perfection of functionality of an organism of children, thus they don't render significant influence on anthopometrical indicators of children