SUMMARY
ON THE SOLVABILITY OF THE SECOND BASIC THREE-DIMENSIONAL DYNAMIC
PROBLEM OF THE HEMITROPIC THEORY OF ELASTICITY
Bezhuashvili Yu.A. and Rukhadze R.V.
Georgian Technical University
The second basic three-dimensional
initial-boundary problem is considered for the hemitropic micropolar medium.
Using the Fourier method, the solvability of the given problem is proved from
the classical viewpoint.
Keywords: hemitropic, medium, three-dimensional dynamic problem, Fourier method, theory of elasticity.
ESTIMATION
OF THE PULSE TRANSITIVE MATRIX AND INPUT COMPONENTS IN DETERMINISTIC AND NONSTATIONARY
MULTIVARIATE MODELS
Odisharia G.B., Odisharia D.A., Kukhalashvili N.K. and Kasoshvili K.N.
I. Vekua Sukhumi Institute of Physics and Technology
Abstract. The article deals with the further investigation of the
algorithm identifying the matrix of pulse transitive functions when the input
influences of nonstationary dynamic processes are assessed simultaneously.
Keywords: algorithm, estimation, pulse transitive matrix, input components.
Summary
generalization of the
Evans Logarithmic Law
Nakhutsrishvili I.G. and
Mikadze O.I.
Georgian Technical University
The Evans logarithmic law has been generalized. The obtained equation describes the formal kinetics of the scale growth provided the reaction area reduces. The kinetic equation is valid for arbitrary initial speed of the process and initial specific weight gains.
Keywords: Evans logarithmic law, scale growth, formal kinetics, initial speed, specific weight gain.
SUMMARY
CYCLIC ADAPTATION WITHOUT FEEDBACK
Prangishvili A.I.,
Namicheishvili O.M., Kajaia T.N. and Ramazashvili M.T.
Georgian Technical University
The article deals with the theory of cyclic
adaptation without feedback in threshold redundancy of binary data transmission
channels. The number of errors of some channel (i.e. at the input of the
threshold organ), revealed during an adaptation cycle by comparing the output
signal of the channel with the correct one transmitted from the outside several
times, gives the estimation of the error probability at this input. Then this
estimation is used for establishment (adaptation) of the relevant channel
weight. An efficient method of choosing the number of comparisons that is
essential in the adaptation cycle is offered.
Keywords: threshold
redundancy, cyclic adaptation, binary channel, feedback, error probability,
channel weight.
SUMMARY
APPLICATION
OF FUZZY SETS TO INFORMATION PROTECTION IN COMPUTER NETWORKS
Kamkamidze K.N. and Gogiberidze Z.A.
Georgian
Technical University
The paper deals with various methods of formation of the function of belonging, including the formation of the function of belonging on the basis of rank estimates. The advantage of the last-mentioned method is the fact that, unlike the method of paired comparisons, it does not require the solution of the characteristic equation. The obtained relationships allow computing the function of belonging by using rank estimates, which are easily gained by experts’ interrogation.
Keywords:
fuzzy sets, function
of belonging, rank estimates, information protection.
Coded Cooperation
based on Punctured
Convolutional Codes
GeorgianTechnical
University
Keywords: coded cooperation,
convolutional coding, wireless networks.
THE MATRIX METHOD FOR DERIVATION OF THE GENERALIZED
DISPERSION EQUATION FOR THE CIRCULAR MULTILAYER MAGNETODIELECTRIC WAVEGUIDE
Gdzelishvili S.C.
Georgian Technical University
Abstract. A matrix method for derivation of the generalized dispersion equation
for finding the propagation constants of eigenwaves of the circular multilayer
magnetodielectric waveguide is presented. The analysis is based on the use of
the unimodular transmission matrix of the cylindrical layer (TMCL), associating
the tangential components of the electromagnetic field strengths at the
boundaries of the cylindrical layer. A simple method for obtaining the TMCL and
deriving the dispersion equation which includes the product of a few TMCL
according to the number of layers of the considered structure is given. The
recurrent notation of the generalized dispersion equation was obtained.
Keywords: circular multilayer magnetodielectric waveguide, eigenmodes,
generalized dispersion equation, hybrid modes, transmission matrix of
cylindrical layer (TMCL).
ELECTRODYNAMIC
THEORY OF THE WAVEGUIDE TEE CONTAINING AN INDUCTIVE ROD WITHIN ITS RESONATOR
AREA
Kevanishvili G. Sh., Asanidze A.B., Kevanishvili I.G., Chikhladze G.G.
and Meladze V.D.
Abstract. A mathematical model of the functioning of the rectangular waveguide
tee when the resonator section of the waveguide contains an inductive rod is
presented. For different sections of the waveguide tee a system of dual
infinite algebraic equations in relation to the unknown coefficients of the
field was derived. These equations belong to the class of Fredholm-type
equations of the second order, and their computer realization is possible by
the method of reduction.
Keywords: waveguide, tee junction,
artificial discontinuity, inductive rod.
SUMMARY
THE GENERATION OF ULTRAHIGH TEMPERATURES AND PRESSURES AND THE PROSPECTS
OF THEIR APPLICATION
Chikhradze N.M. and Kabulashvili V.G.
G. Tsulukidze Mining Institute
Georgian Technical University
LEPL State Military Scientific-Technical Center “Delta”
The possibilities for generation of ultrahigh
pressures and temperatures by detonation of an explosive in laboratory are
discussed. It is demonstrated that ultrahigh pressures and temperatures could
be used in the production of ultrasolid materials (for instance, diamond) and
ultra-dispersive powders. It is also shown that the pressures and temperatures
generated by detonation of explosives of different shapes may be used in
effecting the controlled thermonuclear synthesis.
Keywords: ultrahigh temperatures, ultrahigh pressure,
shock wave, detonation, thermonuclear synthesis.
MONOLITHICALLY INTEGRATED
SCHOTTKY-GUNN GaAs-BASED CIRCUITS
FOR THz APPLICATIONS
Khuchua N.P., Shur M.,
Chakhnakia Z.D., Melkadze R.G., Tutujyan A.A.,
Sakharova T.B., Khvedelidze L.V. and Didebashvili G.A.
Research and Production
Complex (RPC) “Electron Technology”
Iv. Javakhishvili Tbilisi
State University
Center for Integrated
Electronics, Rensselaer Polytechnic Institute, Troy, NY, USA
Abstract. The present investigation deals with
subterahertz and terahertz (THz) technologies.
In the work theoretical prerequisites are studied
and a possibility of development of a monolithic THz radiation source as a
basic part of a sensor system where advantages of Gunn diodes and multiplying
Schottky diodes integrated into a single gallium arsenide (GaAs) epitaxial
structure is analyzed. The theoretical analysis and the results of modeling
allowed us to establish the architecture (sequence and parameters of layers) of
the epitaxial structure as well as to propose the device design and the process
flow.
Keywords: GaAs Gunn
- Schottky diodes, terahertz, integrated radiation source.
COEFFICIENT OF THE MOLECULAR FIELD OF THE f-d EXCHANGE
INTERACTION
Gamishidze Z.M.
Shota Russtaveli State University, Batumi
Abstract. Based on the
system Y1-tGdt(Co1-xAlx)2,
the effect of the field of f-d
exchange interaction on the basic magnetic state of zonal magnetic YCo2 was studied. Basic
magnetic properties of the system Y1-tGdt(Co1-xAlx)2
are considered theoretically. With the aim of comparing the experimental data
with the results of theoretical calculation, based on the experimental data,
the coefficient of the molecular field of f-d
exchange interaction was determined. The coefficient 
is an inportant quantity, as it can be used in the case
of similar compounds for calculation of the critical concentration of an
impurity (in our case, gadolinium) at which the transition from the
paramagnetic state to the ordered magnetic one takes place.
Keywords: coefficient of the molecular field, metamagnetics, f-d exchange interaction, phase transition.
Preparation of SmSb
films
and the influence of Sm ion valence on their optical properties
Gigineishvili
A.V., Jabua
Z.U. and Taktakishvili M.S.
Georgian Technical University
Abstract.
The effect of samarium ion valence on the optical properties of samarium
diantimonide thin films has been studied. The optical constant spectra were
obtained by processing of the reflectance spectra of SmSb2 films at different
values of samarium ion valence (+2.7; +2.4; +2.2) by the Kramers-Croning
method. At all the values of samarium
ion valence, there remained a gap in the energy spectrum and a clear plasma
edge in the spectral dependence of the reflection coefficient. The decrease
in valence causes the decrease in plasma frequency and in the effective number of charge
carriers contribution to plasma
oscillations and also reduces the role of
f-electrons in the formation of
pf and fd hybrid states. The energetic state of zone extremums is very
sensitive to the changes in the valent
state of the samarium ion as well.
Keywords: SmSb2 films,
evaporation, valence, energy gap, optical properties.
Investigation of morphology and magnetic properties of carbon powder nanoparticles
doped with iron and cobalt atoms
Kutelia E.R., Rukhadze L.N.,
Maisuradze N.I., Eristavi B.G., Gventsadze
D.I.,
Àkhalkatsi À.M., Gavasheli T.A., Daraselia D.M., Djaparidze D.L., Shengelaya À.D., Mamniashvili G.I.
and Gegechkori Ò.O.
Republic
Center for Structure Research, Georgian Technical University
Iv.
Javakhishvili Tbilisi State University
E.
Andronikashvili Institute of Physics
Abstract. Complex SEM and AES structure and composition
content measurements, along with the VSM study were carried out on carbon
nanoparticles doped with magnetic clusters, which were synthesized by a novel
technology. This technology combines the method of pyrolysis of ethanol vapors
and the CVD process in a horizontal continuous reactor with certain temperature
gradients and controlled partial oxygen pressure. The structure and composition
data of synthesized magnetic carbon nanopowders showed that the nanopowders
consisted of randomly distributed carbon nanoparticle aggregations 200 nm in
diameter doped with the magnetic clusters. The magnetometric data are in
agreement with the results of structure analysis pointing to the existence of
the significant superparamagnetic contribution to the synthesized magnetic
nanopowders.
Keywords: carbon nanopowder,
magnetic clusters, core-shell, iron, cobalt, doped nanoparticles, SEM, AES,
VSM.
Quantum
representation of the state of the energy-information system
Kadagishvili L.G.
V. Chavchanidze
Institute of Cybernetics
Abstract. The article deals with the
description of the state of electron spin by three quantum numbers and with
energy levels for hydrogen-like atoms. It is shown that the boundary value of
the effective energy determines the strength of the field. The torsion field,
which is the torsion between the levels, actually changes the structure of the
atom and of the association of atoms. It is obvious that the nature of movement
in different systems differs in the quantum content of the state of the
energy-information system. The strength of the torsion field depends on the
strength of the supplied energy.
Keywords: energy-information system, spin,
quantum, electron.
Thermochemical
Substantiation of the Impact of Burden Materials Dispersivity on the Self –
Propagating High – Temperature Synthesis
Tavadze G. F. and Khantadze J. V.
F. Tavadze Institute
of Metallurgy and Materials Science
The quality of the product obtained by the
self-propagating high-temperature synthesis (SHS) depends largely on the
granulometric composition of burden materials. Approximating the burden as a
closely packed statistical ensemble of metal and nonmetal particles of
spherical configuration, the number of heterogeneous contacts occurring in the
mixture of metal and non-metal particles is estimated. It is suggested that the
number of heterogeneous contacts determines the buil-dup of the synthesis
process. Having expressed the values of the heat of reaction by qr and
the heat necessary for liquefaction of the metal particle by qf , the threshold
ratio of dispersity was determined by the granulometric composition of the
burden D/d, above which the fusion
reaction will not spread in the form of a combustion wave. The operating range
1< D/d >(D/d)0 whereby SHS is feasible was calculated.
Keywords: self-propagating high-temperature
synthesis, dispersity, powder, heat of reaction, heat capacity.
Summary
Mathematical-chemical
Investigation of Silver Halides within the Scope of ANB-matrices Method
Rusia M.Sh.,
Giorgadze K.P. and Gverdtsiteli M. I.
Iv. Javakhishvili Tbilisi State
University
Silver
halides were studied within the
scope of the ANB-matrices method. Three correlation equations of the type „structure-properties”
were derived and investigated. The calculations showed that the correlations
were good.
Keywords: silver
halides, ANB-matrix, correlation equation.
THE SCHEME OF SPATIAL-TERRITORIAL PLANNING
OF SOUTHERN REGIONS OF GEORGIA – AN INTEGRAL PART OF SOCIAL AND
ECONOMIC DEVELOPMENT
Chkheidze N.A.
Georgian Technical University
Regional planning becomes more and more important for Georgia under the conditions of development of market relations. Under these conditions, regional planning is a reliable means of purposeful control over territorial development. In view of the growth of the social and economic potential of the territories, the studies of vast areas – regions in order to achieve complex control over their development become more intense. Along with that, the importance of design and planning activities and territorial governing bodies is growing. The scheme of spatial-territorial planning is aimed at solving these problems.
Keywords: regional planning, territorial planning scheme, regional
development, management.
SUMMARY
THE
INVESTIGATION OF RED WINES CONCENTRTED WITH POLYPHENOLS
Ebelashvili
N.V.
Institute
of Horticulture, Viticulture and Oenology of Georgia
The content of phenolic compounds and mineral substances,
and organoleptic indices of red wines produced from local grapes cultivars
Saperavi and Tavkveri were studied. The test samples were prepared by the
technology developed by the authors – by concentration of polyphenols, whereas
the control samples – by standard technology. It was determined that, as
compared to the control samples, in the test samples the content of polyphenols
increased by 45-52%, anthocyans – by 42%, leucoanthocyans – by 6-7%, aromatic
acids – by 69-88%, catechols – by 64-72%, vanillinic aldehyde
- 1.4-2.4 times. The quantitative content of mineral substances in the test
samples increased, generally, owing to the increase in the content of
potassium. The taste panel of the test samples was higher by 0.22 points than
that of the control samples.
Keywords: red wine, phenolic compounds, aromatic acids, catechols, mineral
substances.
SUMMARY
VARIETY
SPECIFIC FEATURES BY THE PHENOLIC SPECTRUM IN GEORGIAN RED WINES
Vepkhishvili N.G., Bezhuashvili M.G. and Javakhishvili M.A.
Institute
of Horticulture, Viticulture and Oenology of Georgia
Jakob
Gogebashvili Telavi State University
Phenolic compounds in self-cleared wine materials
intended for production of red wine of various types were studied. The wine
materials were prepared from red grape cultivars growing in Eastern and Western
Georgia. In particular, the following cultivars were used: Saperavi, Cabernet,
Sovinion, Otskhanuri Sapere, Odzhaleshi. Aladasturi,
Chkhaveri, Alexadrouli and Mujuretuli.Their variety characteristics by the
phenolic spectrum were revealed. The obtained results are interesting from the
standpoint of their comparison with the content of stilbenic compounds to be
determined in these wine materials. The data on all these compounds as
biologically active substances provide scientific support to
medicinal-nutritional quality of Georgian red wines.
Keywords: wine materials, red grapes, red wine, phenolic
compounds.
SUMMARY
PHENOLIC
COMPOUNDS OF AROMATIZED WINES
Bedianidze L.M. and Javakhishvili M.A.
J.
Gogebashvili State University, Telavi
The phenolic composition of aromatized wines and vegetable extracts was studied. The content of total phenolic compounds, proanthocyanidins and catechols was determined. The qualitative composition of carbophenolic acids and aldehydes, and catechols was also determined. The obtained results are characteristic of the studied aromatized wines and vegetable extracts.
Keywords: phenolic compounds, aromatized wines, vegetable extracts.
SUMMARY
THE INVESTIGATION OF
THE REPRODUCTIVE RATE OF LOCAL STRAINS OF XERES YEASTS
Kortava T.T. and Salia E.Sh.
Institute of Horticulture,
Viticulture and Oenology of Georgia
The investigation of the reproductive rate
isolated local strains of Xeres yeasts SKS1, SKS2, SKS3, SKS4 and SKS5 showed that
strains SKS2 and SKS5 manifest a high rate of reproduction of cells, which
promotes their intense fermentation activity.
Keywords: yeast, local strains, Xeres,
reproductive rate, fermentation.
SUMMARY
THE EFFECT OF THE
SUGAR CONTENT OF WORT ON THE FERMENTATION PROPERTIES OF LOCAL STRAINS OF XERES
YEASTS
Kortava T.T.
Institute of Horticulture,
Viticulture and Oenology of Georgia
The investigation of the effect of sugar
content of wort on the fermentation activity of isolated local strains of Xeres
yeasts SKS 1, SKS 2, SKS 3, SKS 4 and SKS 5 showed that, at high sugar
concentration (25%), all strains, except SKS 3, produced complete sugar
fermentation not only at the optimal temperature (26oC), but also at
lower (20oC) and higher (30oC) temperatures of
fermentation. This provides favorable conditions for using these strains in the
production of Xeres-type wine.
Keywords: yeast, local strains, Xeres, sugar
content, fermentation.
SUMMARY
SOME
CYTOGENIC CHARACTERISTICS OF THE KHEVSURIAN POPULATION OF THE GEORGIAN HIGHLAND
BREED OF CATTLE
Jokhadze T.A. and Tabatadze L.S.
LEPL
M.Rcheulishvili Institute of Biological Basics of Cattle Breeding
Some cytogenic characteristics of the
Khevsurian population of the Georgian highland breed of cattle were studied.
These characteristics were the frequency of occurrence of numerical and
structural disturbances, and of fragile sites of chromosomes. The investigation
results allowed inferring that the genome of the cattle breed studied manifests
rather high stability by the parameters of numerical and structural
disturbances of chromosomes and by the expression of fragile sites.
Keywords: cattle breed, cytogenetics, karyotype,
fragile sites, chromosome.
Summary
MYCORHIZA
OF FOREST SPECIES AND ITS ROLE IN PLANT PROTECTION AGAINST PATHOGENS
Kanchaveli
Sh. S.
L.
Kanchaveli Institute of Plant Protection
Mycorhiza is the totality of root tips of
higher plants and fungus mycelium being in symbiosis. The degree of specialization
towards forest plants in mycorhiza-forming fungi is different. The mycorhiza
plays a role in plant protection against pathogens. Protective functions of the
mycorhiza are conditioned by many factors. The mycorhiza serves as a mechanical
barrier against infections. Some mycorhiza-forming fungi reveal antagonism
towards root pathogens. They can also stimulate the synthesis of phytoalexines
in plants.
Keywords: mycorhiza, higher plants,
mycelium, plant protection, pathogens.
SUMMARY
SCAB OF FOREST FOLIAGE SPECIES AND
CONTROL AGAINST IT
Kanchaveli Sh. S.
L. Kanchaveli
Research Institute of
Plant Protection
The scab is a disease of forest woody
species, caused by fungi of Venturia
genus. The scab is
characterized by affection of covering tissues and appearance of dark
velutinous patches on the diseased parts
of leaves, sprouts and fruit. Sometimes the scab is manifested in the form of
scald. The scab affects many forest foliage strains; aspen, poplar, ash,
willow, hawthorn, etc. A complex of agrotechnical and chemical control measures
is applied against the scab.
Keywords: scab, conidium, foliage species