MODERN COMPLEX ISSUES DURING THE PROFESSIONAL EDUCATION OF ADOLESCENTS ON THE RAILWAY TRANSPORT

In the paper the physiological and hygienic estimation of conditions of teenage boys' working and industrial training for the engine-driver assistant of the rolling-stock in an educational institution of a railway profile is given. It is determined, that the students functional state of health is connected with the character and the year of industrial training; the most obvious changes are marked during practice on a regular job place

To the problem of grammatical aspects of translation of scientific and technical literature

Knowledge of the translation subject is crucial for the translator of scientific and technical literature. During translation process, the translator should fully understand the meaning, semantic relations and metatextual elements of the sentences. It is obvious that the most complex grammatical problems of translation are connected with the understanding of syntactic and morphological structure of sentences as linguistic elements that directly convey subject information

Thermal Analysis of Power Transformer

A new approach for predicting the reliability indices based on the numerical analysis of nonuniform temperature fields of power transformer is reported. The failure rates of a power transformer in a real thermal mode of device under natural convection were compared with statistical data. The necessity of unsteady temperature field consideration was shown to enchance the reliability prediction

Optimal Jet Finder

We describe a FORTRAN 77 implementation of the optimal jet definition for identification of jets in hadronic final states of particle collisions. We discuss details of the implementation, explain interface subroutines and provide a usage example. The source code is available from http://www.inr.ac.ru/~ftkachov/projects/jets/Comment: version to appear in Comp. Phys. Commun., 36 page

QCD factorization for the pion diffractive dissociation to two jets

We calculate the cross section of a pion diffraction dissociation in two jets with large transverse momenta originating from a hard gluon exchange between the pion constituents. To the leading logarithmic accuracy (in energy), the contribution coming from small transverse separations between the quark and the antiquark in the pion acquires the expected factorized form, the longitudinal momentum distribution of the jets being proportional to the pion distribution amplitude. The hard gluon exchange can in this case be considered as a part of the unintegrated gluon distribution. Beyond the leading logarithms (in energy) this proportionality does not hold. Moreover, the collinear factorization appears to be broken by the end-point singularities. Remarkably enough, the longitudinal momentum distribution of the jets for the non-factorizable contribution is calculable, and turns out to be the same as for the factorizable contribution with the asymptotic pion distribution amplitude.Comment: Original version from 9 April restore

Hard exclusive production of a vector meson

The processes of a light neutral vector meson, V=\rho^0, \omega, \phi, electroproduction and a heavy quarkonium, V=J/\Psi, \Upsilon, photoproduction are studied in the framework of QCD factorization. We derive a complete set of hard-scattering amplitudes which describe these processes at next-to-leading order (NLO).Comment: 3 pages, prepared for Diffraction 2004, International Workshop on Diffraction in High-Energy Physics, Cala Gonone, Sardinia, Italy, September 18 - 23, 200

Distribution of the magnetic field and current density in superconducting films of finite thickness

A one-dimensional equation describing the distribution of the effective vector potential $\bar A(y)$ across a film width, which holds for thin ($d\lambda$) films alike, is derived based on the analysis of a 2D Maxwell-Londons equation for superconducting films in a perpendicular magnetic field. The validity of this equation for a finite-thickness film is verified by a numerical analysis. An approximation dependence $\bar A(y)$, finite (with all of its derivatives) across the entire film width, is found for films, being in the Meissner state. The flux-entry field is evaluated for a film of arbitrary thickness. An approximation expression is obtained for the distribution of the sheet current density in the mixed state of a pin-free superconducting film with an edge barrier. The latter approximation allows to estimate magnetic field concentration factor at the film edge as a function of external magnetic field and geometrical parameters of the sample.Comment: 12 pages, 10 figure

Study of Compacting Methods for Nanostructured Thermoelectric Materials Based on Si-Ge and Half -Heusler Alloys

Recent methods of compacting nanopowders of thermoelectric materials of silicon germanium and Half-Heusler (HH) compounds based on Ni(Ti,Zr,Hf)Sn are presented. Half-Heusler alloys are known to be intermetallic compounds with quite large Seebeck coefficient and semiconducting transport properties. This makes them a potential candidate for thermoelectric applications. In this study we compare compacting methods applied to raw materials as a function of crystal structure. The results suggest that the thermal conductivity can be reduced by increasing the phonon scattering via nanostructuring. The effect of spark plasma sintering (SPS) and hot pressing on Gleeble system was analyzed by TEM and SEM methods. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3551