Summary

On the kinetics of dynamic quantum systems interacting with the boson field: Part II. Evoluiton equations for correlation and Green functions

Kotiya B.A.

Georgian Technical University

By the method of ordered operators, new exact generalized quantum evolution (kinetic) equations were derived for equilibrium two-time correlation functions and Green functions for quantum dynamic system interacting with the boson (phonon) field (thermostat). (The method based on the use of chronological and antichronological T-products is developed).

The random phase approximation (RPA) is not used in derivation of these equations, and the technique of elimination of boson (phonon) amplitudes is of considerable importance. The collision integrals of these equations contain both the members describing the evolution of real correlations and the evolution members of initial (precollision) correlations determined by the interaction of the subsystem with the boson thermostat at the initial moment of time. Various alternative approaches to the analysis of the dynamic subsystem behavior based on the derived equations are proposed.

To the second-order approximation of the theory of perturbation in relation to the interaction of the subsystem with the thermostat,  generalized quantum kinetic equations with eliminated boson amplitudes were derived for correlation functions from dynamic variables of the subsystem of both Markovian and non-Markovian type, which contain explicit evolution members of precollision correlations.

There is also discussed the application of the derived generalized quantum kinetic equations for equilibrium two-time correlation functions in various models of quantum dissipation systems of the physics of condensed media – the theory of polaron, the theory of motion of quantum Brownian particle etc.

Keywords: ordered operators, correlation functions, Green functions, generalized kinetic equations.

 

SUMMARY

TRANSMISSION OF THE PLANE ELECTROMAGNETIC WAVE THROUGH THE RADOME SANDWICH WITH THE PERIODIC GRATING

Asanidze A.V., Kevanishvili I.G., Kotetishvili K.V., Chuntishvili I.I. and Chikhladze G.G.

Georgian Technical University

An electrodynamic problem of transmission of the plane electromagnetic wave through the dielectric sandwich with the periodic grating, placed at some distance from the layer in the lighted area, is strictly solved.  The transmission coefficient of such a system for the main wave is calculated. It is shown that, at the points of Wood’s anomaly, where the ratio between the period of the grating and the wavelength is a natural number, the presence of the grating does not affect  the value of the trans­mission coefficient of the insulated dielectric sandwich.

Keywords: electromagnetic plane, wave, radome, grating.

 

SUMMARY

scattering of wave H10 on the system of cylinders located in different cross-sections of a rectangular waveguide

Dekanosidze Sh.V., Kevanishvili I.G. and Kekelia G.V.

Georgian Technical University

A problem of scattering of the plane electromagnetic wave on the system of two metallic or dielectric cylinders located in different cross-sections of a rectangular waveguide in parallel with its narrow walls is considered. Using the method of mirror images and realizing the continuity and smoothness conditions of the cylinder surfaces with invoking the electrodynamic analogy of the Green theorem, a dial infinite set of linear algebraic equations in relation to unknown coefficients of multifield spectra scattered by each cylinder was obtained. The analysis of metric elements and free terms showed that the obtained set of equations is the second-order Fredholm one. Therefore it was computed by the reduction method with the help of a computer.

Keywords: rectangular waveguide,  cross-section, system of cylinders, wave scattering.

               

Summary

ELECTRODYNAMIC ANALYSIS AND CALCULATION OF THE ANTENNA RADOME FORMED OF THE PERIODIC GRATING AND DIELECTRIC LAYERS

Kevanishvili G.Sh., Kevanishvili I.G., Kotetishvili K.V., Chikhladze G.G. and Chuntishvili I.I.

Georgian Technical University

The electrodynamic analysis of the antenna radome formed of two tightly hold dielectric layers with different dielectric permittivity, one of them containing the periodic grating formed by two infinitely long conductive cylinders, is suggested.

The conditions at which the power of the electromagnetic field passed through the radome reaches its maximum  value, which, in its in turn, provides the optimal electrodynamic working regime of the radome, are investigated.

Keywords: radome, dielectric layer, grating, electrodynamic analysis.

 

SUMMARY

ELECTRODYNAMICS OF THE CYLINDRICAL ANTENNA

RADOME WITH THE COAXIAL WIRE GRATING

Kevanishvili G.Sh., Kevanishvili I.G., Kotetishvili K.V., Chikhladze G.G. and Chuntishvili I.I.

Georgian Technical University

The theory of the cylindrical sandwich radome is stated for the case of arrangement of the coaxial metal periodic grating within the dielectric layer. The analytical relations for calculation of the geometric parameters of the radome at given values of the relative dielectric permittivity of the layer and the wavelength are derived.

Keywords: radome, antenna, dielectric layer, transmission coefficient.

 

Summary

Radiation patterns of two dielectric concentric spheres excited by a plane electromagnetic wave

Dekanosidze Sh.V., Zamtaradze G.G., Kvatadze Z.A., Kekelia G.V. and Kipiani D.O.

Georgian Technical University

A problem of construction of the radiation pattern of two dielectric concentric spheres excited by a plane electromagnetic wave is considered. It is demonstrated that the absolute maximum of the radiation intensity falls basically on the direction of the geometric shadow, but at specific parameters the deflection from those direction takes place.

Keywords: radiation pattern, plane wave, dielectric concentric sphere, excitation.

 

SUMMARY

Near fields of diffraction of two cylinders located in one cross-section of a rectangular waveguide

Dekanosidze Sh.V., Kvatadze Z.A. and Kekelia G.V.

Georgian Technical University

The near fields of diffraction of a plane electromagnetic wave on two cylinders located in one cross-section of  a rectangular waveguide were studied. The lines of equal amplitudes and phases were constructed. Those lines give an estimate of the field distribution in the waveguide, show the location of local and absolute maximums (minimums), help to find the vortex zone of electromagnetic energy, and allow the determination of the direction of wave motion.

Keywords: rectangular waveguide,  near fields of diffraction, cross-section lines of equal amplitudes.

 

 

summary

analysis of the patterns of the scattered field at diffraction of the plane electromagnetic wave being incident at an angle to the dielectric cylinder axis

Dekanosidze Sh.V., Kekelia G.V. and Kabisashvili D.G.

Georgian Technical University

The analysis of the patterns of the scattered field of the plane electromagnetic wave being incident at an angle to the dielectric cylinder axis was performed at different permittivity, relative radii of the cylinder and angles of incidence. The investigation results are presented.

Keywords: pattern, angle of incidence,  plane electromagnetic wave, dielectric cylinder, scattered field, analysis.

 

SUMMARY

A method of determination of  interval and maximum reliability indices

Mikadze I.S., Arabuli N.V. and Chachua D.R.

Georgian Technical University

An original method of determination of interval and maximum indices of availability of complex units (equipment, devices, elements etc.)  is suggested. A mathematical model of the operation of the service system (of devices, data transmission channels etc.) with built-in instrumentation control  was constructed. The presented model consists of two parts: basic and reference. The indication of serviceability of the basic part is the signal of a certain level at its output which is continuously detected by the supervisory  equipment. The supervisory equipment failures are checked periodically. If the supervisory equipment failure has preceded the basic element failure, those failures can be revealed and eliminated only at periodic checks. The flows of failures of the supervisory and basic equipment  obey the Poisson law.

Keywords: reliability index, distribution function, data transmission channel, service system.

 

SUMMARY

Root locuses  in the theory of catastrophes

Kotrikadze O.G.

Georgian Technical University

The analysis of the specific features of potential functions with the help of root locuses is considered by the example of standard functions of deformation, the fold and “the gather”, and nonstandard deformation. The locuses were constructed, the double critical points and the extreme point of potential functions were determined. The discriminant set of deformation parameters  was found. The root locuses constructed for catastrophes of the fold and “the gather” are universal. The plane of deformation parameters is divided into domains by homomorphic graphs of the potential function.

Keywords: theory of catastrophes, root locus, fold, collapse, potential functions.

 

Summary

analysis of structural robustness using root locuses

Kotrikadze O.G.

Georgian Technical University

The procedure  of synthesis of the correcting device (CD) is considered, and the causes of inaccuracy of the obtained results are shown. For maintaince of the desired stracture of the CD, the application of root locuses is suggested. The efficiency of application of the suggested method is demonstrated by the example of the differentiating RC circuit. The values of the RC circuit parameters were determined with account for total internal resistance of the input signal source.

Keywords: structural robustness, root locus, correction, robustness compensation.

 

SUMMARY

Analysis of the catastrophe “dovetail” Using root locuses

Kotrikadze O.G.

Georgian Technical University

The analysis of the “dovetail” catastrophe was performed using root locuses of the derivative potential function. The real double roots and the values of deformation parameters at those points were determined. A family of root locuses at changes in normed parameters was constructed. The plane of deformation parameters was divided into domains, in each of which the graphs of the potential function were homomorphic.

Keywords: theory of catastrophes, dovetail, root locus, critical point, extremum.

 

Optimal design of the bent-stretched circular plate with consideration for the conditions of rigidity and durability

 

Beridze T.Sh.

 

Georgian Technical University

 

Abstract.  The method of calculation offered in this paper differs from the existing ones by the fact that it allows accomplishment of calculations with given conditions of rigidity and durability with high accuracy. The optimal design of the bent-streched circular plate is presented.

Keywords:  circular plate, optimal design, bending, rigidity, durability.

 

Summary

On the problem of designing of intellectual systems based on microcontrollers

Dadunashvili S.A. and Dgebuadze G.V.

Georgian Technical University

The designing technique of intellectual systems on the base of microcontrollers is considered by the example of direct current engine control in the automobile antiskid device. The realization of the design involves the following stages: the statement and the analysis of the task solved by the system, its engineering interpretation  and the development of the block–diagram of the algorithm.

Keywords: microcontroller, intellectual system, algorithm, graph.

 

A special case of the arrangement of cuts

 

Pailodze N.R.

 

Georgian  Technical University

 

Abstract: The offered procedure of the account of cuts in a plate is the generalization of the procedure of the account of cuts in a single-layered plate, and it is based on introduction of special discontinuous functions, singular functions and delta functions into the initial differential geometrical dependences connecting the displacement vector components and the components of tangential and bending strain.

         Keywords: single-layered plate, arrangement of cuts, special case, special functions.

 

Obtaining of the Nano-Structured Ultrathin Membrane for the Purification of Liquid Gallium from Impurities up to 8N

 

Kutelia E.R., Tsivtsivadze D.M. and Kutelia B.E.

 

Republican Center for Structure Researches (RCSR), Georgian Technical University

 

Abstract.  In this work there are presented the results of complex investigation of the morphology, the chemical and phase composition, and the membrane features of the nanostructured ultrathin oxide skin obtained at self-organization in the process of oxidation of the concentrationally laminated surface layer (~1nm) of the metal melt by the example of Ga. It was established that, in the process of self-organization during the photostimulated oxidation, on the surface of overcooled liquid gallium develops the nanostructured oxide skin in the amorphous condition, which is characterized by all distinctive features and parameters of the ultrathin membrane, namely, it is distinguished by rather high elasticity, and uniform thickness on the entire surface, and contains cylindrical open-ended nanopores with sizes dispersion of 10 ÷ 1000 nm, the number of which is ~ 108 per cm2. By the incapsulation of the certain mass of the gallium melt in the mentioned nanostructured membrane skin, which at the same time is lyophilic and chemically stable with respect to the liquid metal, naturally forms membrane module “melt-membrane-atmosphere”, in which the process of purification (from 6N up to 8N) proceeds in the mode of so-called “evaporation through the membrane” at a single stage and with the lowest power inputs.

Keywords: ultrathin, membrane, purification, nanostructure, liquid gallium.

 

SUMMARY

THE STRUCTURE OF TRANS-DIAQUA-BIS(3-HYDROXYBENZOYL­HYDRAZINE)COBALT(II) NITRATE TRIHYDRATE [Co(С7Н8О2N2)2(OH2)2](NO3)2∙3H2O

Miminoshvili E.B., Miminoshvili K.E., Beridze L.A., Zazashvili S.R. and Ediberidze D.A.

Georgian Technical University

Tbilisi State Medical University

There was studied the structure of compound Co(m-HBH)2(NO3)25H2O, where m-HВН = С7Н8О2N2 (3-Hyd­ro­xybenzoylhydrazine); (а=56,150(6); b=20,045(2); c=7,893(2)Å, Fdd2, Z=16, R(F)= 0,056). The compound is formed of complex cation [Co(m-HBH)2(OH2)2]2+, two anions NO3-  (one of them is disordered) and three water molecules. The geometric parameters of hydrogenic bonds have been determined.  

Keywords: complex compounds, structure, hydroxybenzoylhydrazine, carbonic acid, hydrazide.

 

 

Summary

Investigation of the reaction of electron and hydrogen atom transfer between triplets and diphenylamine

Kokrashvili T.A., Shengelia M.A. and Kokrashvili A.T.

Georgian Technical University

The results of estimation of the lifetime and radii of ion-radical pairs formed at quenching of the triplets of substituted p-benzoquinones with diphenylamine are presented. The rate constants of electron and hydrogen atom transfer at quenching of the triplets of substituted p-benzoquinones with diphenylamine decrease as the electron-acceptor ability of quinone rises.

Keywords: triplet state, hydrogen atom transfer, electron, p-benzoquinone, quenching.

 

Summary

The effect of solvent viscosity on the kinetics of quenching of the triplet state of anthanthrone

Kokrashvili T.A. , Shengelia M.A. and Kokrashvili A.T.

Georgian Technical University

The solvent viscosity dependence of the rate constants of quenching of the triplet state of anthanthrone by aromatic donors of electron and hydrogen atom was obtained. The diffusive and kinetic elementary stages of the quenching reaction were revealed, and the rate constants of these stages were determined. The rate constant of hydrogen atom transfer from phenol to the triplet of anthanthrone in a complex with the hydrogen bond decreased at introduction of electronegative substitutes into the phenol molecule.

Keywords: triplet state, quenching, anthanthrone, solvent viscosity, kinetics.

 

SUMMARY

AUGER ANALYSIS OF THE NANOCRYSTALLINE Ge:GeO2 FILMS

Jishiashvili D.A., Eristavi B.G., Gobronidze V.V., Shiolashvili Z.N., Jishiashvili A.D. and  Makhatadze N.K.

Georgian Technical University

Institute of Cybernetics

Auger electron spectroscopy was used to investigate the Ge:GeO2 film containing oxidized (Ge4+) and elemental (Ge0) germanium nanocrystals. The quantitative analysis was performed using the reference sample consisting of the Ge and GeO2 films deposited side by side with a sharp linear edge. The Auger signals of Ge L3M45M45 were detected  by scanning the surface of the reference having a rectangular form. The Ge/GeO2 ratio in the analyzed rectangular sample was previously changed by shifting the reference in the direction orthogonal to the electron beam. The calibration curve connecting the Ge0 and Ge4+ related peak area ratios with the real Ge and GeO2 ratios in the reference sample was plotted. The Ge0/Ge4+ ratio measured for the Ge:GeO2 film of unknown composition was compared with the calibration curve, and the real ratio of Ge/GeO2 was determined. It was established that the amount of Ge could be measured with the accuracy of 3-4% for the films containing at least  15 at.% of Ge0. At lower Ge0 content, the inaccuracy increases up to 6-7 % due to the increased in the density of atoms at the Ge nanocrystals.

Keywords: nanocrystalline films, germanium, germanium oxide, Auger analysis.

 

SUMMARY

WATER TREATMENT OF THE NANOCRYSTALLINE Ge:GeO2 FILMS

Jishiashvili D.A., Kutelia E.R., Gobronidze V.V., Shiolashvili Z.N. and Makhatadze N.K. 

Georgian Technical University

Institute of Cybernetics

The phase-separated Ge:GeO2 films, consisting of the amorphous GeO2 matrix and Ge nanocrystalsб, were produced by magnetron sputtering. After water treatment of these layers, the nanoporous films were formed. For the film containing            13 at.% of the excess germanium (Ge0), the average pitch sizes of 0.6 mm and the pore length of 15 mm were obtained. The etching rate of the film depends on the concentration of Ge0 and it decreases down to 8 nm/min for the film containing          25 at.%  Ge0. The formation of the nanoporous structure in the water-treated film is caused by the segregation of phases due to the decomposition reaction GeO=Ge+GO2, which takes place during the film deposition.

Keywords: nanocrystal, nanoporous film, germanium dioxide, etching rate.

 

Summary

on a photon structure based on circular cylindrical capillaries

Chanturia G.F., Gaprindashvili H.I., Karakozov K.G., Kutaladze L.M., Tsaturov A.M.

and Tatarashvili R.A.

Institute of Cybernetics

A photon structure based on thin tubular cylindrical rods (capillaries) was obtained, and its functional capabilities were studied. The mechanism of operation of the photon structure is discussed.

Keywords: cylindrical lens, photon structure, light diffusion.

 

Summary

The effect of thermodynamic parameters of the process of hot molding on the properties of sintered metallic compositions

Loladze N.T., Tserodze M.P., Dzidzishvili Yu.G., Grdzelishvili G.Yu., Sharashenidze G.G., Tserodze O.M. and Myakisheva A.I.

Georgian Technical University

The effect of pressure on the processes of liquid-phase and solid-phase sintering in the Gu-Sn-Ni and Fe-Sn-X systems under the conditions of hot molding was studied. A new design of press mold provided a significant increase in the working pressure of the process (up to 1200 kg/cm2). A decisive role of the pressure in the formation of metallic composition structure at solid-phase sintering was revealed.

Keywords: hot molding, metallic composition, press mold, sintering, thermodynamic parameters.

 

SUMMARY

Efficiency of the deformation, the moment and the capacity at rolling in hexahedral and case-square passes

Vashakidze N.A. and Vashakidze G.A.

Georgian Technical University

A new expression for determination of the effective factor of deformation at rolling of rectangular strips with rectilinearly convex side surfaces in hexahedral passes was derived.

The calculation formulae for determination of the moment and the capacity of rolling were also derived for the case of changes in the shape of rectangular strips with convex side surfaces in case-square and hexahedral passes with tension.

Keywords: rolling, deformation, efficiency, rolling moment, rolling capacity, hexahedral pass, case-square pass.

 

SUMMARY

Determination of  contact pressure at rolling in case-square and hexahedral passes with tension of the strip

Vashakidze А.S. and Vashakidze G.A.

Georgian Technical University

The calculation formulae of specific and complete contact pressure at rolling of rectangular strips with rectilinearly convex side surface with tension in case-square and hexagedral passes were derived.

The suggested expressions account for the effect of the shapes of the  strip and the pass on the parameters of the rolling process.

Keywords: rolling, contact pressure, rectangular strip, case-square pass, hexagonal pass.

 

SUMMARY

Nontraditional technology of fabrication of solar cell elements

Kekelidze N.P., Tserelov A.A., Tserelov R.A., Mgebrishvili N.N. and Ermolov A.G.

Iv. Javakhishvili Tbilisi State University

There was developed the technology of fabrication of solar cell elements which differs from the traditional one by its simplicity, elimination of complex, power-intensive equipment, and shorter production time. As a result of implementation of the developed technology, reduction of the solar cell cost by 50% is expected.

Keywords: solar cell, production technology.

 

Summary

Calculation of thermodynamic parameters of  ozone friendly refrigerants in the saturation area

Kekelidze N.P., Suladze S.B., Kvinikadze Z.V. and  Davitaya Z.F.

Iv. Javakhishvili Tbilisi State University

A relative method was used for calculation of the thermodynamic characteristics of new ozone friendly refrigerants. As the reference substance, R22 was chosen. The temperature dependence of the saturated vapor pressure was deduced by interpolation of the empirical data for the reference substance. The described method was tested on four alternative substances having different properties. The comparison of the obtained results with the data of other authors is given. It confirms that, for calculation of the thermodynamic parameters of new substances, it is enough to know their critical pressure and critical temperature, and that the described method works with high accuracy in the entire range of saturated vapor, including the field of the  critical point.

Keywords: refrigerants, thermodynamic characteristics, ozone, saturation area, calculation.

 

SUMMARY

ANALYSIS OF TWO DIGITAL ALGORITHMS FOR REALIZATION of PID controllers

Jokhadze P.D.

Georgian Technical University

The comparative analysis of two methods of proportional-integral-derivative (PID) controllers realization was carried out, The advantages and drawbacks of these methods are shown. The simulation results are given at maximum optimum parameters.The simulation was conducted in the Simulink environment, using the Mathlab Software.

Keywords: digital algorithm, PID controller, realization, analysis.

 

SUMMARY

CRYPTOGRAPHIC ALGORITHM FOR ENCODING of  THE TRANSMITTED DATA               

Kutsiava V.A., Diakonidze K.D., Bochikashvili P.N. and Jokhadze P.D.

Georgian Technical University

There is considered a cryptographic algorithm for data block encoding, in which the original principle of bits displacement and diffusion is used. The algorithm is symmetric and allows encoding the 512-bit-long blocks using a random key of the same length. In the formation of the key, the encoded data take part. The proposed algorithm is robust and fast. 

Keywords: data transmission, encoding, cryptographic algorithm.

 

SUMMARY

APPLICATION OF FUZZY LOGIC IN CONTROLLERS

Jokhadze P.D., Bochikashvili P.N. and Kobakhidze F.D.

Georgian Technical University

There is discussed a controller with digital proportional-integral-derivative control (PID) and its self-adjustment algorithm used for controlling the processes in the objects with initially unknown variable parameters.

The principle of the controller adjustment based on fuzzy-logic technology, where the dynamic adjustment of parameters reduces static errors and eliminates transients caused by casual noise, is presented.   The considered algorithm is simulated with applied software Mathlab..

Keywords: controller, proportional-integral-derivative control, unknown parameters, fuzzy logic.

 

Summary

The Sloping shell of double curvature, freely supported on four sides, under the action of radial load

Bibiluri M.V.

Georgian Technical University

A theory of computation of sloping shells of double curvature is suggested. The proposed theory is an attempt to eliminate complex, awkward transformations and to develop a more convenient and easier computational scheme for practical engineering computations.

Keywords: sloping shell, double curvature, radial load, computational scheme.

 

                     Stability of three-layer plates with cuts and holes

 

Kipiani G.O., Sokhadze A.P. and Lezhava G.K.

 

Georgian Technical University

 

Abstract. The method of calculation of three-layer panels with cuts and holes, enabling one to take  into account the effect of different peculiarities on  the distribution of strains and moments with good accuracy, is presented.

Keywords: plate, tree-layer panel, cut, hole, stability, filler.

 

Summary

Determination of the reliability characteristics of submarine Junctions of power system mains

Georgian Technical University

Gurgenidze D.R.

The problem of determination of the reliability of submarine junctions of power system mains is considered. Based on Markovian processes, a set of Kolmogorov differential equations to be solved by the analytical method was derived. The obtained relations allow the determination of the time intervals between repairs of the submarine junctions of power system mains.

Keywords: power systems, main, submarine junction, reliability.

 

Summary

Optimal arrangement of centrifugal Pumps of the pipelines of power systems

Namgaladze D.P. and Gurgenidze D.R.

Georgian Technical University

Based on the systematic approach, the optimal arrangement of any number of main centrifugal pumps servicing a power system is considered. On the base of combinatory reliability and the method of spatial probabilities, in a  particular situation, there is compiled a list of all possible incompatible logic probabilities, by adding up of which a total or a partial probability of non-failure operation of the system is obtained.

Keywords: power system, pipeline, centrifugal pump, optimal arrangement.

 

Summary

Determination of the path of oil stream spilled in the estuary at damages of energotransport facilities

Gurgenidze D.R.

Georgian Technical University

There is presented a procedure of determination of the path of oil stream spilled in the estuary at damages of energotransport facilities, in particular, at transportation of oil by trestle pipelines, tank cars etc. The path of the oil spilled in the estuary was determined by the numerical method using modified mathematical software Maple 95. The difference between the estimation results and the natural data was within 15-20%.

Keywords: hydroecology, estuary, energotransport facilities, oil, damages.

 

 

Summary

On an application of the quadratic transformations for solution of positional problems

Khatiskatsi I.E. and Metreveli M.G.

Georgian Technical University

A positional problem of applied geometry was solved by using quadratic transformations. Such problems arise in machine-building at designing parts and housings.

Keywords: positional problem, quadratic transformation, applied geometry, designing.

 

SUMMARY

On the issue of optimization of requests and  materialized notations in the oracle database

Magradze E.I. and Abulashvili Kh.T.

Georgian Technical University

Some issues of construction of the architecture of the modern analysis information system for production processes are considered. Materialized notations are important means for increasing the capabilities of databases and decision-making support systems. One materialized notation can be used by many interrelated requests. It is demonstrated that, in the environment where data are actively read, the materialized notations prove themselves by reducing the request servicing time and saving the resources needed for actual execution of the request.

Keywords: database, Oracle, program language, SQL,  materialized notation, optimization of requests.

 

Summary

Experimental investigation of The temperature conductivity coefficient of soya products with consideration for temperature and humidity effects

Sadagashvili E.Z.

Georgian Technical University

The procedure of investigation of the temperature conductivity coefficient of soya products depending on the product temperature is described. The plot of the temperature conductivity of soya products against the product temperature is given. The related empirical formulae have been derived.

Keywords: soya products, temperature, humidity, temperature conductivity

 

SUMMARY

THE TENDENCIES OF DEVELOPMENT OF IMAGE CODING METHODS

Murjikneli G.G., Khoshtaria K.A. and Abzianidze N.E.

Georgian Technical University

The issues of video compression efficiency are considered using the comparative analysis of image coding methods  based on the adopted standards. The further improvement of coding characteristics can be achieved using advanced versions of Wavelet-transform for intracoding and motion compensation methods adaptive to the image content - for interframe prediction.

Keywords: image coding, compression efficiency, intracoding, interframe prediction.

 

Summary

Some peculiarities of the construction of telecommunication networks on the base of ATM technology

Murjikneli G.G., Robitashvili A.G., Tsiklauri D.A. and Vekua T.A.

Georgian Technical University

The issues of construction of telecommunication and computer networks on the base of the ATM (Asynchronous Transfer Mode) technology are considered. The specific features of such networks are described.

Particular emphasis has been placed on the prospects for development of the ATM-based networks with consideration of the worldwide experience. It is demonstrated that the ATM concept has formed and has quickly found the favor of the majority, because its roots stretch deeply into general development of the telecommunication and computer networks.

Keywords: telecommunication network, computer network, ATM, B-ISDN.

 

SUMMARY

The analysis of the possibility of increasing the power of the high-performance Computer cluster using new network technologies

Kamkamidze E.K., Mayer A.A. and Mikiashvili N.V.

Georgian Technical University

There are considered the basic problems of selection of communication technologies at development  of the High-Performance Cluster. The ways of increasing the performance of the computer cluster by using new communication technologies and optimum distribution of the network load are described.

Keywords: computer cluster, high performance, communication network.

 

SUMMARY

Optimal control of the transient regimes of power systems

Khutsishvili O.G. and Khutsishvili T.G.

Georgian Technical University

The problems of optimal control of power systems based on the principles of symmetry are considered. There was used well-known E. Neter’s theorem according to which to some symmetries of the system correspond specific laws of conservation. The law of optimal control, connected with fundamental laws of conservation (the law of conservation of energy and the law of conservation of momentum), was stated.

Keywords: power systems, transient regime, optimal control.

 

DETERMINATION OF Optical parameters of zoning of branched water pipelines (with the help of integer linear programming and excel software)

 

Kikacheishvili G.E. and Kikacheishvili N.G.

 

Georgian Technical University

 

Abstract. The issues of determination of optimal parameters of zoning of branched pipelines of water supply systems are considered. The problem is solved with consideration for the choice of optimal diameters of the pipeline part of the system. There has been developed a model of integer programming, which is realized by using Excel Software.

Keywords: water supply system, branched pipeline, zoning, optimal diameters, linear programming, Excel Software.

 

Summary

Descriptive models simulating changes in the properties of waste waters by some conservative chemical components

Tkesheladze G.A., Salia T.S., Sadunishvili G.A., Nareklishvili T.G., Mchedlishvili N.P. and Mikiashvili N.V.

Georgian Technical University

The problem of construction of descriptive models simulating changes in the properties of waste waters by some conservative chemical components is considered. A type of a possible descriptive model presented as a desirability function, which is constructed by researcher’s subjective preference in relation to the considered components, is proposed. The application of the proposed approach to the construction of descriptive models for estimation of the waste water quality by some conservative chemical components is exemplified by the data on Gardabani Waste Treatment Plant, Tbilisi.

Keywords: waste water, conservative chemical components, descriptive model, simulation.

 

Summary

Application of control charts of quantitative criteria to the process of water treatment in water supply systemS

Salia T.S., Tkesheladze G.A., Gujabidze M.R., Nareklishvili T.G., Mchedlishvili N.P. and Mikiashvili N.V.

Georgian Technical University

The issue of application of British Control Charts as a main tool for estimation of water quality and a means of controlling the water treatment process is considered. There are given the formulae for drawing up the control charts according to British Standards and the results of setting the warning limits and the control limits for some characteristic parameters of the water treatment process at Samgori Water Treatment Plant, Tbilisi.

Keywords: water treatment, control charts, quantitative criteria, British Standards.

 

summary

A devce for monitoring the presence of oil products in sea water at exploration drilling

Mujiri J.N. and Okromchedlishvili S.N.

Tbilisi Research Institute of Metrology

A conductometric device, which is a two-electrode cell with self-contained power supply and a transducer connected to an ultrasonic transmitter, is presented. In case of presence of oil (gas), the electrical conductance of the medium changes abruptly from 5.9S/m to 2×4×10-4S/m, and the detected signal is transmitted to the ultrasonic transmitter. This allows preventing the ecological problems caused by uncontrollable spouting of oil and associated gases.

Keywords: exploration drilling, sea water, oil products, gas, monitoring device, conductometry.

 

SUMMARY

On the calibration of pH Measuring  Devices

Dolidze A.V. and Kartvelishvili G.V.

Georgian Technical University

Tbilisi Research Institute of Metrology

The issues concerning the calibration of pH measuring devices are considered. There is described a general calibration procedure, its purpose and applications. The average values and tolerances for electrode systems are given. In this connection, control components of pH meters are treated in dependence on the required accuracy and, also, from the viewpoint of restoration of the action (validity) of the abovementioned procedure and its adaptation to international projects and standards.

Keywords: measurement of ion activity, pH-metry, calibration procedure, accuracy, control components.

 

Summary

On the devices providing sanitary norms of electromagnetic field radiation frOm the microwave  heatinG-drying conveying plant

Kokoshvili V.D., Zurabishvili V.I., Kokoshvili I.V. and Kekelia G.V.

Georgian Technical University

The devices providing sanitary norms of electromagnetic field radiation from the microwave heating-drying conveying plant are described. The devices are placed at the input and output of the microwave chambers of the plant.  These devices include below cutoff waveguides, wave traps and absorbers of microwave radiation leakage.

Keywords: heating-drying conveying plant, microwave chamber, electromagnetic field, sanitary norms, safety devices.

 

Summary

On the problem of providing the electromagnetic field homogeneity in heatinG-drying chambers of the microwave conveying plaNt

Kokoshvili V.D., Zurabishvili V.I. and Kekelia G.V.

Georgian Technical University

For providing the homogeneity of the electromagnetic field in heating-drying chambers of the microwave conveying plant, the application of special gratings made of thin current-conducting pins located near the raw material is suggested. The effect of electromagnetic field homogeneity is reached due to the local homogeneous field generated around the electrical gratings, i.e. the total field intensity radiated by the generators is accumulated in the raw material layer. Such gratings with thin pins are simple for production and application.

Keywords: microwave conveying plant, heating chamber, homogeneous electromagnetic field, thin current-conducting pins.

 

Summary

FRACTAL COMPACTION IN A COMBINATION WITH NONLINEAR MORPHOLOGICAL FILTRATION IN CODING THE IMAGES AND THEIR SEQUENCES

Kharatishvili N.G., Chkheidze I.M., Steperman V.G. and Otkhozoria V.K.

Georgian Technical University

The results of fractal coding of images of various types, of the  combination of fractal compaction with preliminary "morphological" filtration, and also for the sequence of images of linear interframe interpolation for restoration of missed, fractally processed frames, are presented. The obtained data testify to the efficiency of fractal coding of the images previously filtered by a nonlinear morphological filter, and also to the increase in the efficiency of coding of the  sequence of images by application of interframe linear interpolation.

Keywords: image coding, sequence of images, fractal compaction, nonlinear morphological filtration.

 

SUMMARY

The peculiarities of selection of microcontrollers and the criteria of its estimation

Grigalashvili D.S. and Tsveraidze Z.N.

Georgian Technical University

The peculiarities of application and the problem of selection of the microcontroller for efficient solution of a particular problem at a wide variety of microcontrollers available on the market are considered. The estimation criterion and the recommendations on the selection of microcontrollers have been worked out. The comparative characteristics of microcontrollers produced by Motorola, Amtel, Microchip and Zilog for the specific use in independent microcontroller devices are presented.

Keywords: microcontroller, selection, specific features, estimation criterion, recommendations.

 

Summary

Closed models of channel level protocols and Open models of the data transmission unit

Kiknadze M.G., Petriashvili L.N. and Zhvania T.G.

Georgian Technical University

Functional models of computer networks and systems include the models of network structures and computer components. The closed models of internode connection allow considering for the effect of distortions of the flow of protocol data blocks in direct and backward communication channels on the operational characteristics of the data transmission unit and performing the optimization of the values of frame length and window width by the criterion of the capacity of internode connections. The open models of data transmission unit in the form of a two-unit network fragment allow studying the effect of the factor of blocking of buffer memory of the transit commutation unit and protocol parameters on the capacity of start-stop and pipeline protocols of control of the data transmission unit.

Keywords: data transmission network, open models, closed models, protocol.

 

Summary

Comparative analysis of the sources of continuous power supply used in modern telecommunication and computer networks

Kobakhidze T.D.

Georgian Technical University

The topical problems of the construction of continuous power supply systems are considered. A comparative analysis of such systems has been performed. There is justified the expediency of division of secondary power sources (SPS) into two groups: the SPS for computer networks and the SPS for telecommunication networks,

Keywords: continuous power supply, telecommunication network, computer network, secondary power source, comparative analysis.

 

SUMMARY

On the peculiarities of cophasal modes of operation of continuous power supply sources with the external power supply system

Kobakhidze T.D., Nachkebia Sh.Sh., Bochikashvili P.N., Vekua T.A. and Kurtanidze G.G.

Georgian Technical University

The issues related to cophasal modes of operation of the sources of continuous power supply of computer and telecommunication networks are considered. It is demonstrated that, for construction of the synchronizing circuit in the abovementioned  power sources, integration of additional units is necessary.

Keywords: cophasal mode, computer network, telecommunication network, continuous power supply.

 

SUMMARY

Computation of the processes of gasification of the coal from the Tkibuli – shaori deposit by computer simulation

Bzhalava N.P., Kipshidze M.E. and Jishkariani T.S.

Georgian Technical University

Computer simulation of production of vapor-oxygen producer gas from the coal of the Tkibuli-Shaori Deposit (Georgia) is discused. For computations, table processor Excel with integrated program language VB for Application was used.

Keywords: coal deposit, gasification, computer simulation.

 

SUMMARY

Economic and ecological aspects of the application of biogas

Arabidze N.T., Guliashvili M.N. and Кhetaguri A.G.

Georgian Technical University

The analysis of economic and ecological efficiency of replacement of natural gas with biogas using a new technology is presented. For estimation of the economic effect of the new technology, a multifactor mathematical analysis was performed. The effect of the considered parameters (the demanded amount of natural fuel, the heat equivalent of fuel and the equivalent fuel cost) on the change in the total index was determined. Nowadays, when the cost of natural gas is continuously increasing, the application of biogas instead of natural gas allows obtaining both ecological and economic efficiency, which will help to resolve acute economical and ecological problems of the population.

Keywords: biogas, economic effect, ecology, new technology.

 

Summary

Improvement of the security of building Alignment using microprocessor systems for recording the parameters of lifting

Zotov M.V.

Interbiotech Research –Production Company, Rostov-upon-Don, Russia

The system of improvement of the security of building alignment with the help of hydraulic jack systems using microprocessor systems for recording the parameters of lifting is proposed. The system operates in a semi-automatic mode. Automated is recording of the data from displacement detectors with account for correction of the data by the feedback method. The readings of the signals from displacement detectors and tacheometers are displayed on the screen, and they can be corrected by the operator. There was developed the software providing visualization of the lifting process. and consideration for standard requirements by the difference in settlement of the building. The system was successfully tested at alignment of a nine-storey dwelling building in the town of Volgodonsk (Russia) in 2005.

Keywords: building alignment, hydraulic jack, security, microprocessor system, recording of lifting parameters.

 

SUMMARY

ON the application of laser and holographic equipment for research of medical and biological objects

Tsurtsumia V. L.

Sukhumi Branch of Iv. Javakhishvili Tbilisi State University

The application of laser and holographic apparatuses for the research of medical and biological objects by the optical methods is considered. Specific features  of the medical and biological objects produce certain limitations on the use of standard commercial laser and holographic apparatuses for research purposes. The prospects of development of two- and three-dimensional displays for observing the body structures and tissues, as well as the holographic interferometry for scattering surfaces are discussed. At the same time, the possibilities of application of holographic devices, lasers and photomaterials, used in holographic experiments, produced by local manufacturers for medical and biological purposes are analyzed.

Keywords: laser, holographic equipment, medical and biological objects, research purposes.

.

 

The element composition of the meteorites found in Georgia

 

Kaviladze M.Sh., Gubadze N.V., Kaviladze I.M., Natsvlishvili G.V.,

Tsagurishvili L.B. and Khabuliani K.I.

Iv. Javakhishvili Tbilisi State University

 

Abstract. The results of the analysis of the samples which are considered to be the minerals of the Earth origin. However, reasoning from anomalous isotopic content of some elements, the authors suppose that those samples may be meteorites, if not the obtained  results are novel and they are of major importance for investigation of astrophysical processes and the physics of the Earth.

Keywords: meteorite, presolar grains, isotopic ratio, elemental composition.

 

Summary

New possibilities of processing of pyrometallurgical wastes of production of non-ferrous and noble Metals: 1. Production of arsenic (III) oxide form the wastes

Gigauri R.D., Pareshishvili N.G., Gigauri R.I., Gigauri N.Sh. and Mchedlishvili N.V.

Iv. Javakhishvili Tbilisi State University

The possibility of production of higher trialkylarsenites directly from arsenic-containing pyromethallurgical wastes of tin production has been studied. It is demonstrated that the abovementioned products are obtained with high yield at treatment of the initial mixtures with monoatomic higher alcohols (R ≥ Am) at the suspension boiling temperature by the method of azeotropic drying.

Keywords: trialkylarsenites, pyrometallurgical waste, processing, tin production.

 

SUMMARY

COMBINED Volumetric determination of arsenic and nickel in aqueous solutions

Gigauri R.D., Amirkhanashvili D.G., Arabuli L.G., Gurgenidze M.N. and Injia M.A.

Iv. Javakhishvili Tbilisi State University

A rapid procedure of titrometric determination of arsenic and nickel in the same solution was developed. It is demonstrated that the prerequisite of achievement of the goal set is pretreatment of the samples by the Evans method. At first nickel is titrated with the 0.01 M solution of EDTA (indicator - murexide), and then arsenic is titrated with the 0.05N solution of iodine in the presence of starch. The ions of other metals interfere with the determination of nickel, and the ions oxidized by iodine interfere with the determination of arsenic: antimony (III), vanadium (IV) etc. The procedure has been applied to the analyses of both mineral and synthesized nickel - and arsenic-containing compounds.

Keywords: arsenic, nickel, aqueous  solutions, volumetric determination, titration.

 

Summary

Synthesis and properties of  Silicon-containing lactams

Janiashvili L.K., Koiava N.A. and Sidamonidze N.N.

Iv. Javakhishvili Tbilisi State University

N-methyldialcoxysilylmethyl lactams were synthesized by heterofunctional condensation of chloromethyl­methyldialcoxysilanes with lactams in the presence of K2CO3.The reaction of hydrolytic polycondensation was performed.

Keywords: lactams, silanes, synthesis, heterofunctional condensarion.

 

SUMMARY

Development of materials of the fire-clay-Quartz sand-Glass composition for electrotechnical Purposes

Gagoshidze S.Z. and Cheishvili T.Sh.

Georgian Technical University

For production of electric isolating materials, there was studied composition “fire-clay-quartz sand-glass”, in which soluble glass was used as a binding agent. By studying the binary compositions on the basis of fire-clay, quartz sand and glass breakage powders, a significant effect of the composition on two basic properties of the materials, strength and electrical resistance, was revealed. In the ternary composition were obtained the materials containing 40-80 weight parts of the fire-clay powder. The samples obtained by compacting and baking are characterized by electrical resistivity of lgρ= 9 -11 Ohm××m and compressive strength of 28-42 MPa. Therefore they can be recommended as the base for production of electric insulating materials.

Keywords: electric insulating materials, fire-clay, quartz sand, glass, strength, electrical resistance.

 

SUMMARY

REACTIONS OF CONDENSATION of 4-HYDROXYCOUMARINS  WITH SOME BIOLOGICALLY ACTIVE COMPOUNDS

Jinikashvili I.V., Khachidze M.M., Kvartskhava G.R., Tsitsagi M.V. and  Dolidze A.V.

P. Melikishvili Institute of Physical and Organic Chemistry

The reaction of 4-hydroxycoumarin with N-isonicotinoylhydrazone and imidazole,  biologically active compounds were obtained. Additional reactions with the C=N bonds were investigated.

In the case of unsaturated compounds, the  reactions proceeded at  the C=N  bond. The reaction of condensation was carried out in water suspension in the presence of pyridine  at 950C for 3-4 h.

Keywords: 4-hydroxycoumarin, N-isonicotinoylhydrazone, imidazoline,  biologocally active compounds.

 

SUMMARY

The Acylation of certain derivatives of 1,4-naphthoquinone and

4-hydroxycoumarin with chlorine anhydride of chrysantemic acid

Jinikashvili I.V., Kavtaradze N.A., Dolidze A.V. and  Chedia R.V.

P.Melikishvili Institute of Physical and  Organic Chemistry

The posibility of obtaining new biologically active compounds on the basis of a natural bioregulator (chrysantemic acid- the acid component of pyretrins) and various biologically active substances is discussed. Acylation was realized by means of chlorine anhydride of chrysantemic acid. Chlorine anhydride of chrysantemic acid was obtained by the interaction of chrysantemic acid and thionylchloride (200С, 72 h, Ar). The conditions of acylation reactions of juglone (5-hydroxy-1,4-naphthoquinone), isonaphthazarine (2,3-dihydroxy-1,4- naphthoquinone) and 4-hydroxycoumarin were studied. The structures of juglonylchrysantemate, isonaphthazarinylmonochrysantemate and coumarinyl-4-chrysantemate were determined by IR, NMR(1H, 13C) and mass-spectra methods.

Keywords: juglone, isonaphthazarine, 4-hydroxycoumarin, chlorine anhydride of chrysantemic acid, acylation.

 

SUMMARY
Synthesis of 2-Deoxy-L-glucose

Gakhokidze R.A., Sidamonidze N.N.,  Tabatadze L.V. and Tatarishvili M.Z.

Iv. Javakhishvili Tbilisi State University

By acid isomerization, under the action of lead hydroxide, 1-chloro-1-deoxy-3,4,5,6-tetra-o-acetate-keto-L-fructose was converted into 2-deoxy-L-gluconic acid. The reduction of the corresponding lactone yields 2-deoxy-L-glucose.

Keywords: 2-deoxy-L-glucose, acid isomerization, lead hydroxide.

 

SUMMARY

ANTIBACTERIAL   ACTIVITY  OF  BROMIDE DISACCHARIDES

Tabatadze L.V.  Tatarishvili M.Z.,  Gakhokidze R.A. and Sidamonidze N.N.

Iv. Javakhishvili Tbilisi   State  University

Sukhumi Branch of Iv. Javakhishvili Tbilisi  State  University

By the interaction of allyl derivarives of disaccharides (maltose, lactose etc.) with ethyl ether of 2-bromopropanic acid, hepta-0-acetyl-1-0-(a- methyl-g-bromovalerate) - b-D-,altose  and hepta-0-acetyl-1-0-(a- methyl-g-bromovalerate) - b-D-lactose were obtained.

Keywords: bromovalerate, maltose, lactose bactericides.

 

SUMMARY

investigation of the ARSENIC content in woody plants of Georgia

Loria N.V., Supatashvili G.D., Dughashvili D.T. and Labartkava N.A.

Iv. Javakhishvili Tbilisi State University

There was determined the content of arsenic and its distribution in woody plants growing in Georgia. The effect of the anthropogenic factor on the arsenic content in the woody plants was revealed.

Keywords: woody plants, arsenic, content.

 

SUMMARY

the investigation Results on the biochemistry of tung-oil

Kamushadze I.D., Rukhadze V.V., Khvedelidze V.G. and Buchukhishvili M.L.

Kutaisi Scientific Center of Georgian Academy of Sciences

Kutaisi State University

The basic physical and chemical parameters. of tung-oil were determined. It is shown that the tung-oil produced by pressing and extraction hardly differs by its composition. The high polymerization activity of of the tung-oil is determined by eleostearic acid the content of which makes up 96-97 % of the total content of lipids.

Keywords: tung-oil, biochemistry, eleostearic acid.

 

SUMMARY

Development of sorption – electromembrane technology of water demineralization for power and technological needs of Rustavi Azot CO.

Chkheidze N.V. Soselia G.A., Kvitsiani L.A., Jalagonia D.N. and Gigashvili Z.T.

Georgian Technical University

The basic aspects of water demineralization by the  method of ion exchange are stated; its positive and negative sides are shown. The technological process of water demineralization at Rustavi Azot Co. is considered. The experimental research of water demineralization using a model of the electrodialyzer for imitate solutions was carried out. The processes of water demineralization with simultaneous production of highly concentrated brines were studied. The parameters of the electrodialysis process and a real device were calculated. A new combined technological scheme of water demineralization by switching-on of the electrodialysis plant is proposed . The expected economic effect at Rustavi Azot Co. is shown.

Keywords: water demineralization, soption-elecrtomembrane technology, electrodialyzer.

 

SUMMARY

The study of the process of treatment of the water of the river kvirila

Gogeliani L.D., Mekvabishvili N.I. and Dondoladze N.G.

Georgian Technical University

The process of removal of water hardness and suspended substances from the water of the River Kvirila, Georgia, was studied with the aim of using the treated water in metallurgical industry. This goal was accomplished by using the complex reagent consisting of trisubstituted sodium phosphate, 0.03% diphenylamine, 0.15% plaster and 0.5% acetic acid.

The phosphate ions react directly with many cations contained in water and form hardly solvable phosphate salts. Plaster forms the centers promoting the process of crystallization, and diphenylamine and acetic acid facilitate the process of coagulation.

The analyses of the results obtained with the 2%, 5% and 8% reagent showed that, in all cases, the water hardness decreased from 4.83 mg-eq./l to 0.02-0.01 mg-eq./l, the norm being equal to 0.02 mg-eq./l. Such water hardness completely satisfies the requirements of circulation cooling systems. It is demonstrated that the temperature changes (100C-990C) hardly affected the increase in the rate of the process of precipitation of salts.

Keywords: river water, water treatment, water softening, metallurgy, circulation cooling system.

 

Measurement of the quantity of precipitation in the forecast system of plant diseases

 

Iadze M.V., Partskhaladze R.I. and Suladze A.S.

 

Institute of Machine Mechanics

 

Abstract. The design and the principle of operation of the independent instrument for measurement of the amount of precipitation are described. The instrument is integrated into the microprocessor system of forecasting the fungus diseases of the vine.

Keywords: automated forecast system, diseases of plants, amount of precipitation, independent instrument.

 

SUMMARY

Development of decision algorithms for efficient changes in poultry ration

Davitashvili I.A. and Samkharadze R.Yu.

Georgian Technical University

The decision algorithms developed for efficient changes in poultry ration are presented . Various situations with the corresponding decision algorithms are considered. These algorithms form the basis of the expert system for efficient changes in the poultry ration.

Keywords: decision algorithm, poultry ration, efficient change.

 

Summary

Investigation of the effect of exogenous a-amilase in beer wort production by the example of starch saccharification and gelatinization

Khomasuridze M.B., Khutsishvili R.A. and Shengelia M.O.

Georgian Technical University

The standard method of preparation of barley wort for beer production was used to determine the ability of endogenous α-amylase and the efficiency of exogenous α amylase-enzyme complex Amileqs-2 at different high temperatures during hydration, cleavage and hydrolysis of starch.

The obtained results confirmed that endogenous amylase must have the optimal condition; otherwise it cannot  actualize the process. The exogenous α-amylase enzyme preparation is resistive to strong conditions; it keeps its activity at the temperatures up to 1080C.

Keywords: beer production, beer wort, α-amylase.

 

The determination of the stamina of dry cultured yeast IOC 18 2007 to low temperature and the estimation of its effect on primary aroma during white wine alcoholic fermentation

 

Khomasuridze M. B.

 

Georgian Technical University

 

Abstract. Grape variety, Kaxuri Mtsvane was processed by standard microvinification procedures (it was crushed, destemmed, sulphidized and clarified). Alcoholic fermentation was conducted at different low temperatures (at 12-140C,              16-180C and 20-220C). The experiment was arranged to evaluate the efficiency of dry cultured yeast preparation IOC BR 2007, to determine its tolerance to low fermentation temperature and to maintain the original grape variety aroma.

The organoleptic estimation and the obtained experimental results confirmed that the abovementioned yeast strain was able to ferment white must at low temperature. It is worth noting that the intensity of aroma and flavor and the yield of ethanol increased significantly in the wine sample which was fermented at the lowest temperature.

Keywords: wine-making, yeast, stamina, alcoholic fermentation, low temperature, wine aroma.

 

Summary

Thermophysical characteristics of the grape skin

Lobzhanidze G.V., Khvedelidze V.G. and  Buchukhishvili M.L.

Kutaisi State Technical University

Kutaisi State University

We have defined thermophysical characteristics of the grape skin by the method of two time-temperature intervals within a large scale of relevant factors, such as moisture, temperature and mass amount of the raw materials. We have obtained adequate equatitions of regression for the calculation of thermal diffusivity, heat conduciton, and heat capacity with consideration for the abovementioned factors.

Keywords: grape, grape skin, thermophysical characteristics.

 

Summary

establishment of gas-chromatographic conditions for determination of cumarin in alcoholic solutions

Kuchava G.G., Khositashvili M.L., Abzianidze D.I. and Asashvili T.Sh.

Research Institute of Horticulture, Viticulture and Wine-Making

David Sarajishvili and Eniseli Co.

The data for the establishment of gas-chromatographic conditions of determination of cumarin in alcoholic solutions are presented. Chromaton N-AW was used as a sorbent, granulation – 0.160-0.200 mm, soaked with 15% Apiezon L, gas-carrier velocity – 500 ml/min, hydrogen flow rate – 26 ml/min; air velocity – 300 ml/min.

Keywords: cumarin, alcoholic solutions, gas chromatography.

 

Summary

Development of the regime of extraction of cumarin in alcoholic solutions

Kuchava G.G., Khositashvili M.L., Abzianidze D.I. and Asashvili T.Sh.

Research Institute of Horticulture, Viticulture and Wine-Making

David Sarajishvili and Eniseli Co.

Cumarin was extracted with different extragents (CCl4 and CHCl3) in alcoholic solutions. The percentages in model and alcoholic solutions are in close agreement, which lends support to the reliability and reproducibility of the method used. The maximum relative error of determination made up 17%.

Keywords: cumarin, extraction, alcoholic solutions, development of regime.

 

Summary

Investigation of the effect of various yeasts on the formation of aromatic substances

Mikiashvili M.J., Tsiklauri L.Z., Khositashvili M.L., Pataraia M.S. and Abzianidze D.I.

Research Institute of Horticulture, Viticulture and Wine-Making

The investigation results for the effect of various yeasts on the formation of aromatic substances in wine are presented. The physico-chemical composition and the aromatic components of the wines fermented by various yeasts were studied. The investigation showed that there was no qualitative difference among the samples, while there was observed some difference in the amount of aromatic substances in the wine samples.

Keywords: wine, aromatic substances, yeast, effect.

 

Summary

The investigation of ethereal oils in the rkatsiteli grape

Mikiashvili M.J., Tsiklauri L.Z., Khositashvili M.L., Pataraia M.S. and Abzianidze D.I.

Research Institute of Horticulture, Viticulture and Wine-Making

The results of the investigation of aromatic substances in the Rkatsiteli grape are presented. The aromatic components of the grape must and pomace were studied by gas-liquid chromatography. The aromatic components were mostly found in the pomace, but a significant portion of esters was localized in the grape pulp.

Keywords: wine, grape, Rkatsiteli variety, ethereal oils.

 

Summary

oil extract of tea: CliniCal evaluation of the therapeutic effect

Niguriani N.G., Khvedelidze V.G. and  Mikeltadze Sh.O.

Kutaisi Scientific Center of Georgian Academy Sciences

It has been revealed that the oil extract of tea leaves is of interest as a rich natural source of biologically active substances. It is shown that the extract is pharmacologically active, and it has high pharmacological-therapeutic effect at damages of stomach and integument. This preparation has also anti-tumor activity at skin cancer, and it can be successfully used in oncological practice.

Keywords: oil extract of tea, theraupeutic effect, clinical evaluation.

 

SUMMARY

STUDY OF GASTROPROTECTIVE EFFECTS OF the OIL EXTRACT OF TEA

Niguriani N. G., Khvedelidze V. G., and Mikeltadze Sh.O.

Kutaisi Scientific Center of Georgian Academy of Sciences

The gastroprotective  effect of the oil extract of tea at butadion, atophan and reserpine damages of stomach was studied. It was established that the preparation had a more expressed anti-ulcer effect than aecolum.

Keywords: oil extract of tea, gastroprotective effect.