Exactly integrable nonlinear Schrodinger equation models withvarying dispersion, nonlinearity and gain: application for solitondispersion

We show that the methodology based on the generalized inverse scattering transform (IST) concept provides a systematic way to discover the novel exactly integrable nonlinear Schrodinger equation models with varying dispersion, nonlinearity and gain or absorption. The fundamental innovation of the present approach is to notice that it is possible both to allow for a variable spectral parameter with new dependent variables and to apply of the famous "moving in time focuses" concept of the self-focusing theory to the IST formalism. We show that for nonlinear optics this algorithm is a useful tool to design novel dispersion managed fiber transmission lines and soliton lasers. Fundamental soliton management regimes are predicted     

Using interferometers for the measurement of small displacements during solution of the problems of the state of structures

The features of the performance and operating characteristics of an interferometer containing a volume hologram for the measurement of small displacements are obtained on the basis of comparative experimental studies. The developed and experimentally confirmed propositions are made to improve the design of the interferometer for practical structural diagnostics.     

Soliton cross-trapping: new method for bright soliton transmission at normal group velocity dispersion

It is demonstrated that the Kerr effect in an optical fibre can be used to trap energy in the form of a bright soliton-like pulse at normal group velocity dispersion (GVD) by means of a pair of oppositely phased bright solitons in the anomalous GVD range.<>     

A unified method for measuring small linear and angular displacements of the surfaces of tested objects

The results of an experimental study of a new unified method for measuring small linear and angular displacements of the surfaces of tested objects are presented. Measurements are performed with laser interferometers and intended for solving practical tasks of flaw detection and metrological support of nondestructive testing facilities.     

Experimental unit for studying the processes involved in defect formation in strip-type high-temperature superconductors

The proposed experimental unit will make it possible to perform tests of short and long high-temperature superconductors (HTSC) in strip and wire form and to quickly evaluate their required mechanical characteristics with improved accuracy, thus giving the unit an advantage over similar existing units. The unit will also make it possible to offer a new range of services in regard to the comprehensive testing of HTSC and other new materials. __________ Translated from Metallurg, No. 7, pp. 77–78, July, 2006.     

Soliton-supported femtosecond pulses at normal dispersion inoptical fibers

A numerical and analytical examination is made of the subpicosecond properties of a novel type of optical pulse which, with the aid of a supporting soliton pair, may propagate stably at normal dispersion in silica core fibers     

Experimental evaluation of the interference method of measurement of displacements on the basis of illumination of the surface of a test object

Results from experimental studies of a laser displacement measurement device that implements a new interference method of measurement based on illumination of the surface of a test object are presented. Translated from Izmeritel’naya Tekhnika, No. 10, pp. 26–30, October, 2008.     

A mass-spectrometric study of the thermodynamics of the Fe−Cu and Fe−Cu−C(sat) systems at 1600°C

The Knudsen cell-mass spectrometer combination has been used to study the Fe?Cu and Fe?Cu?C_(sat) alloys at 1600°C. Activity coefficients in the Fe?Cu system are closely represented by the equations $$\begin{gathered} \ln \gamma _{Fe} = 1.86N_{Cu}^2 + 0.03, (0< N_{Fe}< 0.7) \hfill \\ \ln \gamma _{Cu} = 2.25N_{Fe}^2 - 0.19, (0.7< N_{Fe}< 1.0) \hfill \\ \end{gathered} $$ with an uncertainty in the quadratic terms of about 5 pct. For the iron-rich carbon-saturated alloys, the activity coefficient of copper is given by the equation $$\ln \gamma _{Cu} = 2.45(N'_{Fe} )^2 + 0.3N'_{Fe} + 0.03, (0< N'$$ to within an uncertainty of about 10 pct. N _Fe ^′ represents the fraction N_Fe/(N_Fe+N_Cu), etc. The activity coefficient of iron in this region is found to be essentially constant at 0.69±0.05.