SUMMARY

 

1

TRANSMISSIONOF THE ELECTROMAGNETIC FIELD THROUGH THE PLANE DIELECTRIC LAYER

Asanidze A.V., Kevanishvili I.G. and Tskhakaia K.G.

Georgian Technical University

 

The electromagnetic problem of transmission of the electromagnetic field through the dielectric layer is considered. There was determined the condition when the layer transparency was maximum. The electro≠mag≠netic field of the dipole partially percolates through the dielectric layer and carries away the useful information. There were determined the conditions when the amplitude of the transmitted field would be maximum. So, there has been determined the dielectric permeability at which the operation of the radome-protected antenna is most efficient.

Keywords: radome-protected antenna, dielectric layer, electromagnetic field, transmission.
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2

EXCITATION OF THE PROTECTED ANTENNA OF A CYLINDRICAL FORM

Asanidze A.V., Kevanishvili I.G. and Tskhakaia K.G.

Georgian Technical University

 

Electrodynamic properties of the protected antenna of a cylindrical form are considered. It is assumedthat the antenna is passive, i.e. it operates in the mode of reception of electromagnetic waves. There is shown the cross-section of the protectedantenna. The antenna is formed from a layered cylinder; on the axis of the cylinder, there is a reception antenna in the form of a dipole. It is assumed that the cylinder ends are ideally conducting, which allows considering that, according to the method of mirror images, the protected antenna length in the axial direction is infinite. There has been derived the condition when in the protected antenna the maximum current amplitude is excited.

Keywords: protected antenna, plane electromagnetic wave, excitation
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3

THE INITIALS OF THE UNITED FIELD THEORY

Gogsadze R.Sh.

Georgian Technical University

 

A short review of author's monograph "The Initials of the United Field Theory", which is in the process of publication, is presented. Differential equations in relation to the potentials of the united gravitation-electromagnetic (GEH) field were derived. The solution to the set of differential equations for the case of the GEH field of central symmetry was found. On its basis, there were studied particular problems from the physiscs of the Sun, nuclear physics, and elementary-particle physics. The calculated values are in good agreement with the experimental results.

Keywords: united field theory, principles, central-symmetry united field.
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4

ELASTICITY BALANCE OF A THICK COMPOUND PLATE

Khomasuridze N.G., Gorgidze D.A., Javakhadze G.S. and Burjanadze V.O.

Georgian Technical University

 

Mathematical simulation of the stress-deformed state of thick reinforced concrete plates at the stage of elasticity was reduced to evaluation of the elasticity balance of a five- layered rectangular parallelepiped.It is assumed that some of the layers are isotropic and the others are transtropic (transversely isotropic). The solution to the appropriate boundary problem has been found.††

Keywords: mathematical simulation, reinforced concrete plate, elasticity balance, boundary problem, five- layered rectangular parallelepiped.
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5

MODULAR D-GEOMETRICAL LATTICES

Sesadze V.K.

Georgian Technical University

 

Our aim is to describe and characterize the submodular lattices for basic ideal domains. Such lattices are called general geometrical or D-geometrical lattices. We have found the analog of well-known theorems from the classical case. It should be mentioned that these results have quite natural geometrical interpretations.

Keywords: projective geometry, D-geometrical lattice, module.
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6

A PROJECTIVE PLANE, POINTS AND A MODULAR LAW

Sesadze V.K. and Kekenadze V.M.

Georgian Technical University

 

G. Birkhoff proved that finite dimentional projective geometries could be characterized by their lattices of linearly closed subspaces. This characterization is the fundamental link between modular lattices and projective geometries. In this article we describe that link for projective planes and present some related results.

Keywords: projective geometry, projective planes, modular law.
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7

INTERACTION OF A POWERFUL ELECTRON BEAM WITH A SOLID TARGET

Dgebuadze G.N. and Jibladze M.I.

Iv. Javakhishvili Tbilisi State University

 

The experimental results on the interaction of strong-current electron beams with solid materials are presented. It is demonstrated that, at the effect of the powerful electron beam on the target, the basic energy of the beam is spent on heating the plasma emerged at the target surface. The plasma pressure generates the impact wave, which plays the main part in target destruction.

Keywords: electron beam, electron gun, plasma flare, target, impact wave, energy, interaction.
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8

INVESTIGATION OF THE THIRD-ORDER ROTATABLE COMPOSITION DESIGNS FOR TWO VARIABLES

Zedginidze I.G. and Beraia N.O.

Georgian Technical University

 

The results of the investigation on the third-order composition designs for two variables are presented. The structure which is taken by the information matrix for the third-order designs and the conditions of its non-degeneracy are demonstrated. Simplified formulae for calculation of the regression equation factors and formulae for the dispersion and covariation of the regression factors were derived. By scanning the investigated area of the factor space, there was determined such a value of the scale factor at which the designs under investigation were the closest to the rotatable ones. It was also established that the points were to be marked on two circles having non-zero radii. The values of relative deviations of the maximum and minimum dispersion for different sizes of square ŗ are given. There is demonstrated the form which is taken by the information profiles at changing the a size. There was found the optimum value of the square size at which the design became the closest to the unform rotatable one in the investigated area of the space with radius r=2.0.

Keywords: experiment design, symmetrical composition designs.
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9

THE NONLINEAR ALGORITHM OF ADAPTIVEIDENTIFICATION

Lelashvili Sh.G., Khundadze K.G. and Janelidze I.S.

Institute of Metallurgy and Metal Science

 

The generalized iterative algorithm of the nonlinear adaptive model in distinction to the particular algorithm is considered. The operation of such classes of algorithms, like the class of linear algorithms, is determined by the state of adaptive identification, functioning of the statistic modeling system, the stochastic properties of the objects of identification of metallurgic processes. This algorithm has self-adjusting properties and can successfully function during the identification of complex industrial plants with time-variant parameters. Some aspects of application of such algorithms for identification problems in metallurgy are described.

Keywords: iterative algorithm, nonlinear structure, self-adjusting structure, adaptive identification.
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10

THE INFLUENCE OF THE NATURAL OXIDE ON DEPRESSION OF THE EFFECT OF DRIVING VOLTAGE ON THE SUBSTRATE IN ACTIVE COMPONENTS OF INTEGRATED CIRCUITS BASED ON GALLIUM ARSENIDE

Lezhava N.G.

Iv. Javakhishvili Tbilisi State University

 

For depression of the effect of driving voltage on the substrate, there is suggested a method of isolation of active components of integrated circuits based on GaAs using the natural oxide of GaAs at plasma anodization of the corresponding structure areas. The effect of driving voltage on the substrate was measured in darkness and in white light. It is demonstrated that, even at Udr. = -20 V, the relative change in the current of the Schottky field transistor drain ΔI/I0 is <10% in most cases. The suggested method of isolation allows preventing the diffusion of Ga into the dielectric layer.

Keywords: integrated circuit, gallium arsenide, active components, effect of driving voltage, substrate, natural oxide, isolation.
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11

APPLICATION OF THESIMILARITY METHOD FOR DESIGNING THE EPITAXIAL REACTOR

Kutubidze B.V., Popov V.P. and Chicovani R.I.

Georgian Technical University

 

There is described the example of application of the similarity method for designing thereactor that provides the growth reproduction and similarity of epitaxial structures in chloride and chloride-hydride technology. The method of designing the pedestal shape that guarantees the constant growth rate on 10-15 substrates is suggested. The computation was performed for the installation with a vertical cylindrical reactor of the inner diameter equal to 12 cm. The gas carrier flow rate was taken equal to 7 l/min at 20ºC, which made up 400 cm3/s in terms of the deposition zone temperature equal to 750ºC. The substrates of the 2.5 cm diameter were used. The number ofpyramid (pedestal) sides was equal to 8. The suggested method of pedestal designing is supported by the experimental results.

Keywords: epilaxial deposition, reactor, similarity method.
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12

INVESTIGATION OF THE CHLORIDE METHOD OF GROWING THE EPITAXIAL LAYERS OF INDIUM PHOSPHIDE

Kutubidze B.V. and Chikovani R.I.

Batumi Polytechnic Institute

Georgian Technical University

 

The investigation results on growing the epitaxial layers of InP by a chloride method are presented. It is demonstrated that the purity of initial reagents provides reproducible formation of epitaxial layers with electron concentration n ≥ 3∑1014 cm and mobility μ=2500-4500 cm2/V∑s. The suggested method of growing the epitaxial layers can be applied to production of the devices of microwave frequencies in optoelectronics and photonics.

Keywords: indium phosphide, epitaxial layers, growth, chloride method.
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13

GROWING THE EPITAXIAL LAYERS OF INDIUM PHOSPHIDE BY PYROLYTIC SYNTHESIS

Kutubidze B.V. and Chikovani R.I.

Batumi Polytechnic Institute

Georgian Technical University

 

The investigation results on growing the epitaxial layers of InP by the MOC-hybrid method are presented. It is demonstrated that the MOC-hybrid method has significant advantages over chloride methods.

Keywords: indium phosphide, epitaxial layers, growth, pyrolytic synthesis, MOC-hybrid method.
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14

INFLUENCE OF THERMAL TREATMENT ON INTERNAL FRICTION IN MONOCRYSTALLINE GALLIUM PHOSPHIDE

Darsavelidze G.Sh., Kutelia E.R., Goderdzishvili G.I., Janelidze A.G., Kervalishvili M.P., Mkheidze D.T., Chikovani R.I., Guliashvili T.A. and Mkheidze T.D.

Georgian Technical University

 

The influence of vacuum thermal treatment on the temperature spectrum of internal friction of GaP:Te was investigated. It was shown that, after the thermal treatment at T³700įC, in the internal friction spectrum over temperature range T=750-780įC, the relaxation maximum with activation energy 2.5-2.8 eV is revealed. As the mechanism of the relaxation process the movement of stacking faults in the {111} system formed during thermal treatment at high temperature is suggested.

Keywords: internal friction, thermal treatment, activation energy, stacking faults, frequency factor.
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15

PROSPECTS OF THE DEVELOPMENT OF PRODUCTION OF PHOTOELECTRIC SEMICONDUCTOR CONVERTORS OF SOLAR ENERGY IN GEORGIA

Goderdzishvili G.I., Mkheidze T.D., Trapaidze I.T. and Chikovani R.I.

Georgian Technical University

 

The prospects of development of solar photoenergetics in Georgia are analyzed. It is noted that the photoelectric method of conversion of the solar energy based on semiconductor materials is especially promising. It would be expedient to realize the production and application of solar photoelectric convertors in Georgia by stages in the scope of a complex research, technical and industrial program for 10-12 years.

Keywords: solar energy, photoelectric convertors, semiconductor materials.
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16

CHEMICAL AND STEREOSELECTIVITY OF COMETATHESIS OF CYCLOOCTADIENE AND 1-HEXENE IN THE PRESENCE OF ŐÓ—l5/SiO2-SnMe4

Goletiani A.R., Bykov V.I., Samsoniya Sh. A. and Finkelshtein E.Sh.

Iv. Javakhishvili Tbilisi State University

A.V. Topchiev Institute of Petrochemical Synthesis, Moscow, Russia

 

We found the cometathesis conditions and COD conversion (23į—, mole ratio COD:1-hexene=1:4, COD conversion 50%) at which the target 1,5,9-tetradecatrienes have been obtained with selectivity 40% and stereocontent 1,5Z,9Z/1,5Z,9E=60/40. Such optimal conditions of obtaining the mix of tetradecatrienes of the given stereounit are selected that can be used to make the exact copies of the sex-pheromone of Pectinophora Gossypiella - a dangerous pest of cotton.

Keywords: metathesis, olefins, feromones, selectivity, cyclooctadiene.
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17

SYNTHESIS AND X-RAY DIFFRACTION STRUCTURAL STUDY OF GUANIDINIUM DIAQUADICITRATOCUPRATE

Miminoshvili E.B., Sakvarelidze T.N., Bel'sky V.K. and Miminoshvili K.E.

Georgian Technical University

P.Melikishvili Institute of Physical and Organic Chemistry

L.Karpov Research Institute of Physical Chemistry, Moscow, Russia

 

Coordination compound (GunH)4[Cu(Cit)2(OH2)2], where GunH is guanidinium cation (C(NH2)3)+ and Cit is citrate (C6H5O7)3-, was synthesized, and its structure was determined by X-ray crystallography. The crystal structure is built of guanidinium cations, octahedral complex [Cu(Cit)2] anions and water molecules. Citric acid represents a tridentate ligand and forms five- and six-membered metallocycles.

Keywords: complex compounds, synthesis, X-ray structure analysis, citrate metallates, guanidine.
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18

Synthesis of naphto[2,1-g]indole

Chirakadze O.G., Buyanov V.N. and Chirakadze G.G.

Georgian Technical University

D.I. Mendeleev Russian Chemical and TechnologicalUniversity, Moscow, Russia

 

The synthesis of new naphto[2,1-g]indole has been carried out by the following consecutive conversions: oximination and condensation with acetylene. The synthesized compound was investigated by elemental and spectrometric (UV-Vis, IR, H1-NMR) methods of analysis. The obtained data are in good agreement with the experimental results.

Keywords: naphto[2,1-g]indole, synthesis, analysis.
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19

BASIC PROCESS CONDITIONS OF THE SYNTHESIS OF 4,4'-(2-NORBORNYLIDENE)DIPHENOL AND ITS PHENYL-SUBSTITUTED DERIVATIVES

Papava G.Sh., Maisuradze N.A., Dokhturishvili N.S., Sherozia V.A.,
Abashidze G.S. and Papava K.R.

P. Melikishvili Institute of Physical and Organic Chemistry

 

Card bisphenol with a norbornane group at the central carbon atom was synthesized. The optimal conditions of synthesis were established. For the synthesis of bisphenol, cyclopentadiene was condensed with vinyl acetate, then hydrogenated and saponified. After oxidation of norbornanol, a ketoneĖnorbornanone was formed. By condensation of the ketone with phenol, bisphenol was formed. The methyl-substituted bisphenol was syntesized by condensation of norbornanone with o-cresol. The bi- and tetrachlor-substituted bisphenols were synthesized by its chlorination in acetic acid. The molecular weight, hydroxylic group and elemental composition of the bisphenols are in good agreement with the theoretically computed values.

Keywords: norbornane, vinyl acetate, norbornanol, bisphenol, cyclopentadiene, process conditions, synthesis.
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20

INVESTIGATION OF THE KINETICS OF MOLECULAR REARRANGEMENT
OF THE DERIVATIVES OF DISACCHARIDES

Gakhokidze R.A., Sidamonidze N.N., Vardiashvili R.O. and Gorgiladze B.G.

Iv.Javakhishvili Tbilisi State University

 

Under the action of lead hydroxide, b-chloro-2-O-(trichloroacetyl)-hexa-O-acetyl-lactose and b-chloro-2-O-(trichloroacetyl)-hexa-O-acetyl-cellobiose are converted into 4-O-(b-D-galactopyranosyl)-2-deoxy-D-gluconic and 4-O-(b-D-glucopyranosyl)-2-deoxy-D-gluconic acids. The optimal conditions for the abovementioned reactions of molecular rearrangement were defined on the basis of the kinetic analysis.

Keywords: molecular rearrangement, disaccharides, 4-O-(b-D-galactopyranosyl)-2-deoxy-D-gluconic acids, 4-O-(b-D-glucopyranosyl)-2-deoxy-D-gluconic acids.
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21

INVESTIGATION OF THE KINETICS OF THE TETRAFLUOROETHYLENE AND BROMOTRICHLOROMETHANE TELOMERIZATION

Chkhubianishvili N.G., Khananashvili L.M. and Chkhubianishvili D.N.

Georgian Technical University

 

The kinetics of the tetrafluoroethylene and bromotrichloromethane telomerization reaction was investigated in a special laboratory plant. It was found that the telomerization reaction rate was practically similar to that of the initiator decomposition. The telomer yield was directly proportional to the concentration of the monomer and to the square - root concentration of the initiator. Rate constants of the telomerization reaction stages were calculated.

Keywords: telomerization, reaction kinetics, tetrafluoroethylene, bromotrichloromethane.
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22

KINETICS OF TRIBUTYLARSENATE FORMATION UNDER NONISOTHERMAL CONDITIONS

Kasradze Kh.A., Rusia M.Sh.,Bezarashvili G.S., Dzotsenidze Z.G., Abuladze M.K., Namoradze M.A. and Gigauri R.D.

Iv. Javakhishvili Tbilisi State University

 

The reaction betweenorthoarsenic acid and butyl alcohol was investigated. The process was observed using a volumetric method viadistillation of the by-product(water). The reaction rate values were determined by the method of graphical differentiation of the kinetic curve.

The experimental results were processed by means of the correlation analysis method. It was established that the activation energy of the reaction is approximatelyequal to zero. There was derived a specific kinetic equation describing the dependence of thedepth ofchemical conversion on time under the given experimental conditions. The adequacy of the equation in relation to the experimental data was tested.

Keywords: kinetics, arsenic acid, esterification, tributylarsenate.
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23

BIOMASS FOR FUEL CELLS: PROMISING OPTION FOR CLEAN ENERGY PRODUCTION

Aladashvili T.Z., Berezhiani M.G., Dudauri T.V., Partskhaladze G.Sh. and Chkhaidze B.Sh.

National High Technology Center of Georgia

 

Invented over 150 years ago, fuel cells have seen only limited use outside the laboratory. Until recently, fuel cells were used mainly in the space program and for certain military applications. Nowadays fuel cell-based power technology is, in many aspects, mature. In near future fuel cells are considered to be used in zero-emission vehicles and also as high-efficient combined heat-power systems including portable power generators. With few moving parts and little noise, as well as recoverable heat energy, fuel-cell systems are well suited for distributed and on-site power generation. Although close to commercialization, the fuel cells are still the object of intense research and development. In this article, special attention is paid to basic principles of fuel cell technology, process aspects and environmental advantages of usage of the fuel cells. Basic issues of biomass-based fuel cell power generation are discussed. A brief description of the Biogas Fuel Cell Project in Georgia is also given.

Keywords: fuel cells, co-generation, biomass, biogas.
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24

PRINCIPLES OF MANAGEMENT OF ORGANIZATIONAL SYSTEMS

Gasitashvili Z.A., Gorgidze I.A., Javakhadze G.S. and ChkhikvishviliKh.T.

Georgian Technical University

 

Principles of management with approach to a state, a branch, and an enterprise are considered. Organizational methods of management that are based on the hierarchical network of Strategic Management Centers are suggested. The principles of functioning of the Strategic Centers at the levels of information monitoring and the system of decision-making support (based on the informational technology of simulation) are established. The problems of research for the Strategic Centers are also defined.

Keywords: strategic center, decision-making support, management simulation.
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25

REGULATION AS A SPECIFIC TYPE OF MANAGEMENT

Javakhadze G.S., Chomakhidze D.I. and Dumbadze Z.G.

Georgian Technical University

 

State management is considered, and its essence is characterized as a special type of management of natural monopolies. A brief review of the history and goals of Regulation Commissions in different countries is presented. The activities of Georgian Regulation Commissions are described.

Keywords: regulation, monopoly, state management, Regulation ommission.
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26

ON THE PROBLEM OF DETERMINATION OF CONTROL PARAMETERS FOR ENSURING THE SAFETY OF GAS DISTRIBUTION SYSTEMS

Kherodinashvili I.Sh.

Georgian Technical University

 

There were determined control parameters for ensuring the safety of gas distribution systems (GDS): the indexes of safety systems, the threshold values and limits of integrative parameters for the GDS components, and hazards for the GDS.

Keywords: gas distribution system, safety, control parameters.
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27

ON THE PROBLEM OF CONTROLLING THE JACKS AT LEVELLING OF MULTISTOREY BUILDINGS

Zotov V.D., Bolotov Yu.K., Makhviladze K.L. and Zotov M.V.

Georgian Engineering Academy

 

The possibility of controlling the jacks at levelling of multistorey buildings and general laws of lifting the overground parts of the building, the foundation and bases are considered. By the example of levelling of a concrete building, the finite-element analysis and full-scale experiment are demonstrated. The values of the forces applied to the ground depending on the areas of switching on the jack groups are presented. Some general recommendations are given.

Keywords: levelling of buildings, jack, control, laws.
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28

ESTIMATION OF THE STRESSED STATE ON THE FOUNDATION Ė GROUND SURFACE IN DEPENDENCE ON THE HEIGHT OF JACKS ABOVE THE FOUNDATION BOTTOM

Zotov V.D., Bolotov Yu.K., Makhviladze K.L. and Zotov M.V.

Georgian Engineering Academy

 

The computation for estimation of the stressed state on the foundation-ground surface in dependence on the height of jacks was carried out with consideration of the spatial work of the foundation ground and the work of the foundation and overground structures. Druker -Pagerís model was used. The set of differential equations was solved by the conjugate gradient method using theNewton-Rafson iteration. The optimal conditions of adjusting the jacks by their height for achieving suitable contact stresses were established.

Keywords: building, jack, height adjustment, contact, stress.
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29

CHARACTERIZATION OF CONTACT SURFACES OF VACUUM DRIVES AS BELT BEARINGS

Molodini R.N.

Georgian Technical University

 

The drives of belt conveyors, including vacuum drives, operating in a hydrodynamic mode are considered as belt bearings. In the vacuum drives, three basic units were classified into three groups according to the way of giving rise to vacuum. The units are as follow:

1. Collectors of various designs, with the help of which the vacuum pump is joined to operating receptors of the cylinder.

2. The circular aperture formed bycontact surfaces of the conveyor andvacuum cylinder.

3. Independent cylinder-piston vacuum mechanisms rising vacuum in the circular aperture.

The limits of contact surface roughness were determined. The possibility of rising and maintaining the uniformly distributed vacuum in the circular aperture of the drive was analyzed. By the example of hydrodynamic and boundary friction modes, the values of the viscosity and flow rate of the liquid in capillars were determined.

Keywords: belt conveyors, vacuum drives, contact surface, belt bearing.
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30

SERIES CONNECTION OF INDUCTIVELY COUPLED COILS

Museliani T.G.

Georgian Technical University

 

A correct representation of the mathematical model of inductively coupled electrical circuits is suggested. The earlier representations resulted in a mathematical model making no physical sense. The earlier repre≠sen≠tations do not agree with the experimental results, which impedes solution of some practical problems of the analysis and synthesis of transformer bridges and electrical circuits of compensation. There is described the procedure for correct construction of the mathematical model in the reference system of like terminals.

Keywords: inductivity, mutual induction, mathematical model, like terminals, vector diagram.
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31

DIFFERENTIAL EQUATIONS AND ENERGY OF THE MAGNETIC FIELD OF INDUCTIVELY COUPLED CIRCUITS

Museliani T.G.

Georgian Technical University

 

A dual character of electromagnetic inertia of mutual induction was established. It was found that the negative electromagnetic inertia impeded and the positive electromagnetic inertia facilitated those changes in the electromagnetic movement quantity which had caused the inertia itself. Adequate differential equations of the currents and energy of magnetic fields of inductively coupled electrical circuits were derived with consideration of the Lenz law of electromagnetic inertia. For multiloop circuits in the uniform basic reference system of like terminals, differential equations of voltage equilibrium were derived according to the second Kirchhoff law.

Keywords: like terminals, electromagnetic inertia, mutual induction, reference system.
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32

INVESTIGATION OF TANGENT TENSIONS IN THE DESCENDING FREE GASEOUS HYDRAULIC STREAM

Namgaladze D.P. and Qsovreli G.K.

Georgian Technical University

Georgian Research Institute of Energetics and Power Constructions

 

The tangent tensions in the descending free gaseous hydraulic stream were investigated. Basing on the obtained experimental data, the empirical relation linking the tangent tensions in one-phased and two-phased (gaseous) streams with the cross-coordinates was derived.

Keywords: tangent tensoins, gaseous hydraulic stream, empirical relation, investigation.
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33

DETERMINATION OF THE RELATION BETWEEN THE VOLUMETRIC CONCENTRATION OF THE FREE GASEOUS STREAM AND ITS DENSITY

Namgaladze D.P and Qsovreli G.K.

Georgian Technical University

Georgian Research Institute of Energetics and Power Constructions

 

Basing on the analytical investigation, the relation fordetermination of the volumetric concentration of the gaseous stream by the density of the stream mixture was determined. The obtained relation forms essential preconditions for further hydraulic analyses of the free gaseous stream.

Keywords: free gaseous stream, volumetric concentration, density, relation.
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34

IONOMETRY IN MEDICINE: STATE OF THE ART, PROSPECTS

Dolidze V.A., Khetsuriani R.G. and Shengelia R.M.

Tbilisi State Medical University

 

The advantages of application of ionometry in medicine are considered. The examples of application of ion-selective electrodes are demonstrated. At present the development of ionometry tends to the following:

*               expansion of the line of the ions to be determined;

*               wide application of field-effect ion-selective electrodes;

*               development of the devices for noninvasive (transcutaneous) analyses of gaseous-ion content of blood.

Keywords: medicine, ionometry, state of the art, prospects.
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35

AN OPTICAL DEVICE FOR PEOPLE WITH POOR VISION

Avaliani J.I. and Kordzakhia I.I.

Research Institute OPTICA

 

The results of the experimental development are presented. The aim of the development was an improvement in the technology of manufacture of polymeric aspheric lenses for a desktop optical device for people with poor vision. The optical device like "retro" with polymeric aspheric lenses was designed. The device has high technical and market characteristics.

Keywords: aspheric lenses, poor vision, optical device.
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36

ANALYSES AND RESEARCH OF THE GRAPHICAL FORMAT OF THE GEORGIAN ALPHABET SYMBOLS

Khelashvili D.A. and Tsiskaridze D.B.

Iv. Javakhishvili Tbilisi State University

 

For symbol identification, there exist a lot of algorithms and programs. In most cases, a symbol is described by means of point and vector methods. In this work, there is suggested a new qualitative description of symbols, which does not depend on the symbol size, width or outline. The research of the input symbol graphic face is provided according to the classification of symbols and their properties. Description of one symbol by this method needs 11 bits. Here, this method is illustrated by the example of Georgian writing alphabetic letters, but, if we studied any symbol of any language, we would see that, for each character, one can find group properties describing it uniquely. It should be mentioned that the presented work is the result of psychoheuristic research.

Keyword: qualitative description, identification, symbol, comparative analysis, Georgian alphabet.
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37

THE METHODS OF ORGANIZATION OF VOICE COMMUTATION VIA DATA TRANSPORTATION NETWORKS WITH PACKAGE COMMUTATION

Tskvitinidze I.V.

Georgian Technical University

 

The problem of real-time voice communication via data transportation networks with package commutation is considered. The commutation of channels often cannot satisfy growing demands of the market, promote active implementation of new services and reduce the expected costs of expansion of networks etc. In this connection, the scheme of organization of telephone communication via the package network and the structure of the software for the data transportation network are suggested.

Keywords: voice communication, data transportation network, package commutation, organization.
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38

METHODS OF DETERMINATION OF VEHICLE MAINTENANCE INTERVALS AND CHARGES

Turashvili R.T. and Kharitonashvili V.A.

Georgian Technical University

 

The methods of determination of vehicle maintenance intervals and charges by total fuel consumption are suggested. It is demonstrated that the total fuel consumption definitively represents the technical state of the vehicle, service conditions, and driver's qualification. Mathematical expressions for determination of the coefficient of adjusting the maintenance intervals and their annual number by the total fuel consumption are given.

Keywords: vehicle, maintenance intervals, charges, total fuel consumption.
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39

THE EFFECT OF WEAR OF A TYRE PROTECTOR ON THE TECHNICAL STATE OF VEHICLES

Turashvili R.T. and Kharitonashvili V.A.

Georgian Technical University

 

The theoretical justification of the effect of wear of tyre protector on vehicle safety and the charging custom duties on the import of vehicle tyres are presented. It is demonstrated that tyre wear decreases the coefficient of rolling resistance and the coefficient of road grip of the tyre. At the same time, the breaking distance increases. The optimum wear of the tyre protector by the road grip coefficient is equal to 0.4-0.5%.

There are given mathematical expressions for determination of the amount of custom duties on the import of tyres with account of their price, average propector height and tyre service life.

Keywords: vehicle, tyre protector, wear, road grip, import of tyres, custom duties.
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40

VARIANT DESIGNING OF REPLACEABLE DETAILS OF COLD EXTRUSION TOOLS

Gvilava E.G. andNozadze D.A.

Georgian Technical University

 

The important role of variant designing in the process of creating the CAD-Systems of cold extrusion tools is shown. On the basis of generalization of large literatural data, the tests of type designs of replaceable details of cold extrusion tools were carried out. Parametrical models of principal types of tools have been worked out, which is the basis of their variant designing program modulus.

Keywords: cold extrusion, cold forging, variant designing, CAD, CAD/CAM, tools.
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41

ON THE ANALYSIS OF ANTHROPOMETRIC DATA ON SERVICEMEN'S FEET

Katamadze G.A. and Katamadze A.G.

Kutaisi State Technical University

 

Boots are a very important component of military ammunition. Anthropometric measurements of servicemen's feet (about 1,000 soldiers) were carried out. The obtained data were processed statistically and basic statistical indexes for each person were determined. The investigation results have justified the hypothesis that the specific features of feet obey the normal distribution law. To substantiate the established regularity, correlation and regression analyses were carried out. The obtained results can be used for determination of reliable values characterizing the size features of servicemen's feet. As a result, a rational scale of the production line of military boots can be computed.

Keywords: servicemen, boots, feet, anthropometric data, statistical analysis.
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42

DOES THE NOTION OF CREATION OF NATURAL SYSTEMS CONFORM WITH THE NOTION OF THEIR SELF-ORGANIZATION?

Khvedelidze M.A.

Institute of Cybernetics

Georgian Engineering Academy

International Informatization Academy

 

Analyzing the publications in reference to the paradigm of notions "creation" and "self-organization", the author has drawn the following conclusions:

1. The scientific notion of self-organization of the energy-informational work of matter, measured in the units of electronּvoltּbit of the structural information, determines quantitatively this property of matter and information.

2. The notion of creation is referred to the definition of magic creative activities of the God, the Supreme Mind, who "created" the Material World according to his program of evolutionary development of matter (from the simplest physical-chemical structure to a live one, and then to the highest one - the human being and his social system).

3. Apparently, it can be admitted, that the notion of self-organization conforms with the notion of creation of natural systems.

Keywords: creation, self-organization, natural systems, conformity.
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43

INVESTIGATION OF SPROUTING ENERGY OF BARLEY TETNULDI AND ITS ENERGY INDEXES FOR PRODUCTION OF MALT

Gogitadze I.K. and Mudjiri L.A.

Research Institute of Horticulture, Viticulture and Wine-Making

 

The grade of barley Tetnuldi that was at Mtskheta Selection Station by selection on the basis of the material brought from Chile, was studied in order to produce maltand to use it in brewing. It is possible to make barley into malt if it has a high ability of sprouting, during which ferments become active and cause splitting of starch and albumin and other changes. If the malt contains lots of unsprouted grains, it has a low ability of becoming sugared, and less is the yield of the extract. The conducted experimental work has shown that the sprouting quality of barley Tetnuldi satisfies the requirements to the barley to be used for production of malt which can be used for production of high-quality beer.

Keywords: barley, malt, brewing, sprouting energy.
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44

INVESTIGATION OF THE COEFFICIENT OF VISCOSITY OF SEMISWEET WINES AT PASTEURIZATION

Megrelidze T.J. and Pruidze I.B.

Georgian Technical University

 

The instrument for determination of viscosity of liquids and the testing procedure are described. The coefficients of dynamic and kinematic viscosities of semisweet wine Khvanchkara were determined over the temperature range of 168-368 K. With increasing temperature, the values of the mentioned coefficients decreased from 4.91×10-6 m2/s to 0.69×10-6 m2/s and from 5.01×10-3 Pa×s to 0.7×10-3 Pa×s, respectively. The obtained results were used for thermal computation of the process of pasteurization of semisweet wine Khvanchkara and for designing thermal apparatuses.

Keywords: wine, Khvanchkara, pasteurization, viscosity.
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45

INVESTIGATION OF THERMOPHYSICAL CHARACTERISTICS OF SEMISWEET WINE KHVANCHKARA

Megrelidze T.J. and Pruidze I.B.

Georgian Technical University

 

There are presented the results of the experimental investigation of semisweet wine Khvanchkara. In particular, the coefficients of specific heat, thermal conductivity and thermal diffusivity were determined. The empirical equations for calculation of the abovementioned coefficients were derived.

Keywords: semisweet wine, Khvanchkara, thermophysical characteristics.
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 –ņ“ »Ň —őőŃŔŇÕ»Ŗ

 

46

ON AN APPROACH TO THE SOLUTION OF SPATIAL PROBLEMS OF MATHEMATICAL PHYSICS BY OPTOELECTRONIC COMPUTERS

Elizbarashvili M.R. and Natroshvili O.G.

Georgian Technical University

 

Application of specialized computers having high operating speed and huge optoelectronic memory for solution of three-dimensional boundary problems of modern mathematical physics is considered.

Keywords: mathematical physics, boundary problems, optoelectronic devices.
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47

FACTORS AFFECTING THE POWER OF RADIATION IN QW LASERS

Davarashvili O.I., Enukashvili M.I,Kekelidze N.P., Mkheidze T.D., Mamedov T.S. and Tecer L.H.

Iv.Javakhishvili Tbilisi State University

Georgian Technical University

Institute of Physics of the NAS Azerbaijan

Karaelmas University, Zonguldak, Turkey

 

The analysis of the factors affecting the achievement of the maximum power of radiationin QW lasers has shown that the effect of threshold current reduction increases when laser resistance Rs is less than 0.1 Ohm.

Keywords: QW laser, power, radiation, threshold current, resistance.
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48

SYNTHESIS OF A NEW SYSTEM OF BISINDOLYLSPIROCHROMENE

Ovsyannikova N.N., Samsonia N.Sh., Iashvili N.M. and Samsoniya Sh.A.

Iv. Javakhishvili Tbilisi State University

 

As a result of interaction between dihydrazine and methylisopropyl ketone, bis[2,3,3-trimethyl(5-indoleninyl)]≠methane was synthesized. By treatment of indolenine with methylindole and KOH, and its further interaction with the 5-nitrosalicylic aldehyde derivative of bis(5-indolylmethane), bis(1,3,3-trimethylindolin-2-spyro-2'[2H]-6'nitro≠chro≠mene≠-5-yl)≠methane was obtained.

Keywords: spirochromene, bisindolinospirochromene, bis(indolyl-5)methane, dihydrazine, bis(5-indoleninyl)≠methane.
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49

METHODS AND MEANS OF RECOGNITION OF SOUND IMAGES USING OPTICAL IMAGES OF PHONEMES

Berianidze T.O. and Natroshvili O.G.

Georgian Technical University

 

Methods and means of recognition of sound images using optical images of phonemes are suggested. The possibility of designing the efficient optoelectronic device for visualization of sound images that can be used in combined devices of recognition of not only voice signals, but also of acoustic signals of other kinds, is considered.

Keywords: sound images, recognition, optical images of phonemes, optoelectronic device.
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50

CORRECTION OF THE LOAD-CARRYING CAPACITY OF VEHICLES

Turashvili R.T. and Kharitonashvili V.A.

Georgian Technical University

 

There is suggested a method of correction of the load-carrying capacity of vehicles by axle load with consideration for admissible indexes of thrust and braking dynamics. The condition of increasing the load-carrying capacity by the braking distance index was established. This provides a higher degree of road safety and refinement of the Tax Code of Georgia.

Keywords: vehicle, load-carrying capacity, correction, axle load, braking distance, road safety.
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