ROTATION OF DOMAIN STATES IN FERROELASTIC DOMAIN STRUCTURES
L. InoveckyGymnazium, Zborovska 45, Praha 5, 15000, Czech Republic
This work deals with misfit angles, which are observable in
ferroelastic phase transitions. In the literature the misfit angles were
calculated for six different ferroelastic phase transitions, where there is
only one possible misfit angle. In this work the method for obtaining all
misfit angles (for the cases where there is more than one possible) is
introduced. Also the expressions for all possible misfit angles for each
ferroelastic species are given.
PACS numbers: 62.20.Dc
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CCD OBSERVATIONS OF THE MINOR PLANET (73) KLYTIA
G. Szabo``Radnoti Miklos'' Experimental High School, Szeged,
Hungary
We present unfiltered CCD observations of the minor planet (73) Klytia
carried out between 20th February and 2nd March 1997. These measurements
allowed us to perform a detailed study regarding the asteroid's light
variation. The period of the light curve, found in the 21 hours long data
series obtained on 4 nights is 8.275 hours (0.3448\pm0.0003 day). The
amplitude of the light variation is 0.28 mag. Assuming that the light
variation is due to the rotation of the non-spherical minor planets, we have
fitted a rotating ellipsoid to the observed light curve and derived its
minimal a/b axis ratio equal to 1.28. The fitting method was quite
approximate, therefore its results should be considered as rough estimates of
the real shape.
PACS numbers: 96.30.Ys, 95.75.De, 95.75.Mn
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INFLUENCE OF LIGHT ON DISSOLUTION PROCESSES IN CHALCOGENIDE GLASSY
SEMICONDUCTORS
D. BoyarskiyMivza Ovda 110/28, Beer Sheva, Israel
In this work characteristics of dissolution processes in chalcogenide
glassy semiconductors (illuminated and non-illuminated) were studied. The
main purpose of this work was studying different compounds of the
chalcogenide glassy semiconductors of the As-Se and As-S systems and their
reciprocation with some selective solvents. The author of this document and
his instructor consider as the most significant result of this work the
discovery of an effective positive solvent (\gamma\approx100) in As_45S_55
films.
PACS numbers: 71.55.Jv, 78.90.+t
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SEA-BOTTOM PROFILE - REMOTE DETERMINATION PROBLEM IN GEOMETRICAL
APPROACH
O. KuzminovSecond General Education Technical Lyceum attached to
Samara State Technical University Rabochaya 19, 443041 Samara, Russia
The problem of the remote determination of a sea bottom is discussed.
The approach which enables analysis of the experimental data obtained after
reflection of audio signal from a sea bottom is presented. A computational
algorithm for solving this problem was written. The examples of results for
the sea-bottom profile interpolation that has been done with help of
``Maple-V, Release 3 for Windows'' are presented.
PACS numbers: 91.50.Ey, 87.59.Fm
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SOME GENERALISATIONS OF BRACHISTOCHRONE PROBLEM
A.S. ParnovskyLyceum No.~145 for Natural Sciences, Sh. Rustaveli 46,
Kiev-23, 252023, Ukraine
300 years ago Johann Bernoulli solved the problem of brachistochrone
(the problem of finding the fastest travel curve's form) using the optical
Fermat concept. In the same way we solved some generalisations of this
problem. We obtained the fastest travel curve's form in a gravitational field
for a point-like mass. When moving in a uniform gravitational field we
considered the influence of the dry friction or drag.
PACS numbers: 03.20.+i, 46.10.+z
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LONG-RANGE FERROMAGNETIC ORDER IN ENSEMBLE OF NANOMETRIC MAGNETIC
PARTICLES WITH GIANT MAGNETIC MOMENTS
N.G. TakzeiLyceum No. 145 for Natural Sciences, Sh. Rustaveli 46,
Kiev-23, 252023, Ukraine
Using X-ray and magnetic methods as well as small-angle neutron
scattering, it is shown as an example of the decomposing alloy Cu_64Mn_9Al_27
that the appearance of long-range ferromagnetic order in a system of small
superparamagnetic particles dissolved in nonmagnetic metallic matrix is due
to cooperative ordering of their magnetic moments.
PACS numbers: 61.46.+w, 75.25.+z, 75.20.En
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DETERMINATION OF STRENGTH OF SOLID POROUS BODY
A.A. VihtukKiev Physics and Technique Faculty of the Kiev Polytechnic
Institute, pr. Peremogi 37, Kiev, Ukraine
The problem of destruction of solid bodies is investigated by the
science of strength of materials and constructions - mechanics of
destruction, expounded on the base of modern conceptions about destruction of
different nature bodies. Two kinds of material obtained in different ways
have been investigated in this work. A method of alloying the micropowder
composition by ultradispersed admixture was used. It increased a value of the
Veibull parameter and of average strength of these materials. All these
results were calculated and presented in diagrams.
PACS numbers: 07.10.Pz, 62.20.Mk, 81.05.Rm
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