Scientific Notes of

Taurida National V.I. Vernadsky University

Taurida National V.I. Vernadsky University

Series

Physical and Mathematical Sciences

**Berzhansky V.N., Sorokin Yu.V. **

Hyperfme Interactions and Covalency Effects in the Chromium
Chalcogenide Spinels

*Using the LCAO method, obtained the expressions contributions at supcrexchange interactions of ions
chromium with next anions and cations in the chromium chalcogenide spinels.*

**Ryabushkin D.S., Borisov V.V.**

Approximants Method in Nuclear Magnetic Resonance Theory

*In this paper the peculiarities of formation of two-pulse NMR responses in heteronuclear solids
containing two types of magnetic nuclei are investigated.*

**Fridman Yu.A., Kosmachev O.A.**

Influence of External Pressure on Phase States and Spectral Lows
of Ferromagnet with Complicated Single-Ion Anisotropy

*In the paper the phase transitions on pressure in ferromagnet with complicated single-ion anisotropy
with account of inclined anisotropy are investigated. It is found that in the system under investigation only two
magnetic phases may realize, and external pressure creates effective anisotropy.*

**Fridman Yu.A., Klevet Ph.N. Spirin D.V.**

Reorientation Phase Transition on Temperature in Two-Dimensional Ferromagnet with the Account of High-Order Anisotropy

*The reorientation phase transitions on temperature in thin films (with thickness of few monolayers) are
investigated in the paper, ft is shown that the account of high-order anisotropy and magnetoelastic interaction
leads to the realization of angular phase in the system. The phase transitions in the system under study are of
the first order and their characteristry are determined mainly by elastic and magnetoelastic parameters.*

**Arifov L.Ya., Lelyakov A.P.. Roschupkin C.N. **

The Dynamics for Closed String in Peress Space -Time

*In this article, in single approximation, we find solutions of motion equations for closed string moving
in Peress space - time on the perturbation theory, where role of a small parameter plays siring tension.*

**Zinchenko E.N., Roschupkin S.N.**

The Singular Perturbation Theory and String Dynamics of Rindler
Area

*In this article, in single approximation, we find the solutions of motion equations for closed string
moving in Ringler space - time.*

**Mueller I.V., Novender W.R., Bazhenov B.M., Dolgosheev A.T.**

About the Theorem Sirl

*The field inside the dielectric cylinder is shown to be the "transformation" of the field of external sources.*

**Glumova M.T., Vorobev М.D.**

A Research of Influence of an Issuing Non-Uniformity of the Cathode
per Volt-Ampere Performances of Electroless Electronicses

*In the article the research of influence issuing of the cathode per volt-ampere performances (current-voltage characteristic) is adduced, the fulfilment which one has become possible only with usage by the
designed writers of numerical dynamic model of electron-beam tubes.*

**Ponomarenko V.l., Popov V.V. **

Single-Layer Radioabsorbing Coatings on the Basis of Two-Level
Composites

*Optimum parameters and radiotechnical characteristic of single-layer radioabsorbers are researched.
Composites containing conductive inclusions, distributed in the environment being artificial dielectric on the
basis of inclusions of the same type, and also in the dielectric environment with a dispersion of a resonant type
were researched.*

**Dzedolik I.V., Lapaeva S.N.**

Dynamicsof Gaussian Pulses, which are Excited on the Basic and the
Highest Modes in Optical Fiber

*In the paper two regimes of the transmitting of the Gaussian pulses without and with the initial frequency
modulation in the graded-index fiber are researched. The tail wave surface of the pulse without the initial frequency
modulation falls behind the top wave surface and the front wave, surface passes ahead of the top wave surface. The
tail wave surface of the pulse with the initial frequency modulation passes ahead the top wave surface and the front
wave surface falls behind of the top surface, i.e. the regime of the pulse wave front inversion appears.*

**Skibinsky K.M., Strugatsky hi.В., Khizhnyi V.l., Tarakanov V.V.**

Amplitude - Frequency
Characteristic of Iron Borate Under Magnetic Birefringence of Transverse Sound

*In experiment on magnetic birefringence of transverse sound amplitude-frequency characteristic curve
was found. Constructed theory describes the experiment adequately.*

**Shostak R.I. and Yatsenko A.V.**

On the Temperature Dependence of the Components of the Electronic
Polarizability Tensor of O^{2-} Ions in Ferroelectric LiNb0_{3} Crystal

*Temperature dependences of the principal components of the electronic polarizability tensor of the O ^{2-} ions in stoichiometric LiNb0_{3} crystal are calculated. It is shown, that the anisotropy of the electronic polarizability of the 0^{2-} ions is closely influenced by the length of the shortest (Nb - O) bonds.*

**Yevdokimov S.V. and Yatsenko A.V.**

Investigation of the Photoiduced Macroscopic Electric Field in
LiNb0_{3} Crystals under their Illumination by Polarized Light

*It is investigated the influence of illumination of the LiNbO _{3}:Fe crystals by linear-polarized light on the
^{93}Nb NMR line parameters and on the short-circuit photocurrents. It is concluded that the homogeneity of the
total electric field in the illuminated area of crystal is strongly influenced by the parameters of the light source.*

**Ponomarenko V.I., Lagunov I.M.**

Quasimagiletics on the Basis of Metallized Spherical Corpuscles

*The computational model of a synthetic magnetic with unregulated frame is constructed on the basis of
metallized spherical corpusclcs. is exhibited, that in a paramagnetic material the order-disorder transformation results in frequency shift quasirnagnetic resonance and modification of the form of a resonance characteristic, and also to ascending components of inductivity. In a diamagnet the influence of an order-disorder
transformation to a dispersion of з magnetic permeability is expressed more weakly.*

**Dolgov A.I., Basiladze G.D. **

Optimization of Coupling Coefficients of Fiber-Optic 1x2 Couplers for
One-Fiber Bus Network

*Light power coupling coefficients of fiber-optic couplers 1x2 configuration being optimised for work
stations connection to fiber-optic local network bus are calculated. It is shown that selection of couplers
according to calculated coupling coefficients allow to increase a number of network stations.*

**Boborikina О.V., Nasonkin V.A.**

About a Capability of a Short Forecast of Earthquakes on an Example of
Records of Laser Interferometers

*The scheme for a data analysis in geophysical measurements is offered. The outcomes of an application
of the scheme in deformations observations executed by laser interferometers in Sevastopol district of are got.
The offered scheme can be the basis for some technique of a short forecast of earthquakes in locale.*

**Berzhansky V.N., Gordieriko T.P., Lagunov I.M., Milyukov V.V.**

The Computer Course on Physics.
Mechanics

*There are presented the tasks of computer course on Physics «Mechanics». There are described both
structure of computer course as a Whole and structure of each task. The recommendations for application of
tasks are given.*