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SUMMARY

DIFFRACTION OF THE DIPOLE WAVE ON THE SPHERE WITH THE DIELECTRIC HOUSING

Asanidze A.V. and Kevanishvili I.G.

Georgian Technical University

The rigorous solution to the problem of diffraction of the dipole wave on the sphere with the dielectric housing is presented. Practical application of the proposed theory is demonstrated by the example of a spherical radome. In particular, there has been derived the equation for determination of the inner radius of the radome when the specific permitivity of the dielectric layer is little more than one (ε_r ≥1).

Keywords: dipole, radome, permitivity, electromagnetic wave, diffraction.

GEOMETRIC MODELING AND GRAPHICAL METHODS OF SOLVING THE PROBLEMS

Sesadze V.K. and Kekenadze V.M.

Georgian Technical University

General principles of geometric modeling are discussed. Basic approaches to realization of the models are presented.

Keywords: geometric modeling, graphical methods, space.

PLANAR CONFIGURATION AND PROJECTIVE PLANES

Sesadze V.K. and Kekenadze V.M.

Georgian Technical University

There were studied classical geometric configurations related to Fano planes and Dezarge's theorem. The systems of axioms concerned are presented.

Keywords: planar configuration, Fano plane, lattice.

NAKAGAMI DISTRIBUTION AND ITS CHARACTERISTICS

Ugrelidze N.A.

Georgian Technical University

The Nakagami distribution is considered. There are given the equations for computation of distribution moments, the distribution function and the distribution entropy.

Keywords: Nakagami distribution, distribution function, moments, entropy, equations.

ON THE MODELS OF SOFTWARE RELIABILITY

Teimurazishvili E.A.

Iv. Javakhishivili Tbilisi State University

There are considered the models based on Nonhomogeneous Poissonian Processes (NPP), in particular the models with a finite number of failures, the models with an infinite number of failures, and the models for future investigations using NPP. The parameter of the internal estimation in the analysis of software is considered. It is noted that the best choice of the covariant asymptotic matrix providing the maximum probability of correct estimation of basic parameters is the inversion of Fisher's information matrix. Using the covariant parameters of the models, we can find the asymptotic variation for reliability and other characteristics.

Keywords: software, reliability, model, survey.

SERVICING OF REQUESTS UNDER THE EFFECT OF EXTERNAL DISTURBANCES

Mikadze I.S., Arabuli N.V. and Eliauri L.Sh.

Georgian Technical University

There was constructed a mathematical model of operation of duplication of the duplicated servicing system (devices, data-transfer channels etc.). The servicing system consisting of a basic (operating) device and a similar backup device is considered. The recovery time is a random value with exponential distribution. If the operating device is fails to operate, reconfiguration of the system takes place, and, as a result, the operating device is subjected to repair, but the beckup device comes into operation. If both devices fail to operate in the process of request servicing, the system becomes inoperable, and the process starts from the beginning, which distinguishes the proposed model from the available ones.

Keywords: servicing system, duplication, mathematical model, external disturbance.

EFFICIENT DATA-TRANSFER RATE OF THE COMMUNICATION CHANNEL

Arabuli N.V and Eliauri L.Sh.

Georgian Technical University

At data transfer in distributed networks, the repeated transfer of distorted flows, in which errors decrease significantly the transfer rate, is used. The data should be transferred in long packets, if possible. In this case, if the data-transfer rate is maximum, the frequency of error occurrence increases sharply. In this paper, a possible compromise between the data-transfer rate and the packet length is proposed. The communication channel with automatic repetition of the distorted data blocks was considered. There was determined the distribution function of the packet-transfer time, its mean value, and the efficient number of separations of the data into packets and data-transfer rate providing the maximum capability of the communication channel.

Keywords: communication channel, data-transfer rate, maximum capability, packet length.

ON A THEORY OF X - RAY OPTICS: CONVERSION OF THE-quasi- fraunhofer diffraction into the frensel one

Gegiadze G.G., Guljaev R.G., Kekelidze N.P., Rekhviashvili I.Z. and Taliashvili Z.I.
Iv. Javakhishvili Tbilisi State University

Focusing of the primary X-rays reflected from bent single-crystal wafers finds use mainly in their monochromatization and reaching the maximum light-gathering power, the location of secondary diffracted rays. Preference is given to real-complete single-crystal wafers bent along the symmetric (upper) semicircle of the ellipse, the length of which is determined by comparing it with the length of sewn arcs of logarithmic spirals coming from the focuses of the ellipse semicircle (the interferential condition). Such a comparison explains the essence of all kinds of focusing of the secondary rays, and its generalization is associated with elliptic diffractometry.

Keywords: X-ray optics, theory, diffraction, focusing, single-crystal wafer.

ON THE PECLET NUMBER FOR THERMOPHYSICAL COMPUTATIONS AT METAL CUTTING

Abuladze N.G.

Georgian Technical University

The formula usually used for computation of the Peclet number at metal cutting takes no account of the front angle of the cutting tool. There are suggested the equations taking into account the effect of the front angle on the Peclet number. They allow determining the Peclet number by the specified conditions of cutting with accuracy ±8%, and more precisely by experimental values of the efficient contact length and the shrinkage of chips, or by the shrinkage of chips determined experimentally for an arbitrary front angle.

Keywords: metal cutting, Peclet number, front angle, computation.

INFLUENCE OF CYLINDRICAL LENSES - CONCENTRATORS WITH A LINEAR FOCUS ON THE VALUE OF THE GENERATED ELECTRIC POWER IN Ga-As PHOTOVOLTAIC CELLS

Avaliani J.I., Abazadze J.V., Kibler S.R., Kordzakhia I.I. and Nadiradze J.V.

Research Institute OPTICA

There is experimentally investigated of the influence of cylindrical lenses-concentrators with a linear focus on the value of the generated electric power in Ga-As photovoltaic cells. The maximum sizes of lenses were 290´190 mm, the focal length - 800 mm, and the degree of concentration was from 20 to 29. The size of the Ga-As photovoltaic cell was 10´10 mm. The experiments have shown a significant dependence of the generated electric power on the degree of concentration of solar radiation.

Keywords: solar energy, lens-concentrator, linear focus, Ga-As PV module.

REGENERATIVE CYCLE FOR HYDROGEN ENERGETICS

Avaliani J.I. and Dolidze S.V.

Research Institute OPTICA

There was investigated the fuel cell device working on solar energy. Using Ga-As PV elements, electrical energy was generated with the help of which H₂O was splitted for hydrogen production. The electrode in our experimental setup was a nickel plate, the working fluid was 25% NaOH solution. The regenerative cycle is a very promising solution to energetic problems.

Keywords: fuel cell, hydrogen, regenerative cycle, solar energy, Ga-As PV module.

ON THE STRUCTURE OF THE SYSTEM OF MODELS FOR POTENTIAL PRODUCTION PLANNING IN "WATER INDUSTRY" OF GEORGIA

Giorgadze P.Sh. and Tsikhelashvili Z.I.

Georgian Technical University

Optimization of potential production planning in "water industry" of Georgia can be performed with the help of the system of mathematical-economic models. There is proposed the procedure of description of the structure of the system of models with application of the degree of organization, which can be used for characterization of the processes of planning the production in the "water industry" of Georgia.

Keywords: water industry of Georgia, production, system of models.

ON A POSSIBLE MODEL OF BUILDING-BLOCK PLANNING OF THE POTENTIAL PRODUCTION IN "WATER INDUSTRY" OF GEORGIA

Giorgadze P.Sh, Klimiashvili L.D. and Tsikhelashvili Sh.Z.

Georgian Technical University

The mechanism of building-block planning of the potential production in "water industry" of Georgia is proposed. There is considered the model of building-block planning with a linear function of costs (with a permanent manpower fund), which allows decreasing the degree of uncertainty under dynamic conditions. The proposed model provides a way of revealing the hidden reserves, and expanding the production and distribution.

Keywords: water industry of Georgia, production building-block design, planning.

SYNTHESIS OF THE THIRD-ORDER ROTATABLE, AND CLOSE-TO-ROTATABLE AND UNIFORM-ROTATABLE DESIGNS FOR TWO VARIABLES

Beraia N.O. and Zedginidze I.G.

Georgian Technical University

The third-order designs that are close to rotatable and uniform ones are considered. There were investigated the properties for the design with symmetric location of additional points when, on the basis of the design symmetry, eight experimental points were located on another circle of non-zero radius , and with the center in the general center of the design. There is suggested the efficient third-order design for two variables, which is formed by addition of four points located in vertices of the square with coordinates ±a to eight points of the second-order rotatable design. The dimensions of the square at which 16-point and 12-point designs were close to rotatable and uniform ones were determined.

Keywords: experimental design, third-order designs, rotatable designs.

SELECTION METHOD FOR THE MARKET WITH MULTIPLE CRITERIA

Kadagishvili L.G. and Iosava M.D.

Institute of Cybernetics

Georgian Technical University

Qualitative positioning of commodities on the market is the problem with multiple criteria. For its solution, there is used the selection method with the help of which the system distribution of the commodity parameters is performed. In the process of selection, using the expert system, the quality range of the commodities is represented in the form of levels. The information obtained from the experts is interpreted as the result of alternative selection.

Keywords: market, commodities, quality, selection, criteria, expert system.

SPECIFIC FEATURES OF THE STRUCTURE OF FREE-GROWING NANOPARTICLES OF SUPERCONDUCTING CERAMICS ErBaCuO

Kutelia E.R., Sanaia E.E. and Darsavelidze G.Sh.

Republican Center of Structural Research of Georgian Technical University

Morphology and structural transformations of free-growing nanoparticles of superconducting ceramics sputtered by ionic bombardment of the compact target made of ErBa₂Cu₃O_7-x(x<0.2) were studied by transmission electron microscopy (TEM). In situ experiments were performed by heating the sample with the help of the intense electron beam in the microscope column. The nanoparticles formed in the ionic sputtering chamber were entrapped on three meshes located at different distance from the target. Different stages of structural transformations of nanoparticles were registered at their heating at 25-250ºC by the intense electron beam: from one- and two-dimentional modulated structures to mosaic-block (domain) monocrystalline microstructures. The nanoparticles formed at the external boundary of the condensation zone and a square profile on the TEM image are likely to have a cubic form. Their size distribution was 10-250 mm. The nanoparticles formed in the nearest internal condensation region are dimers aggregated by nucleus clusters in the form of an "amorphous group" with the features of unidimensional modulation.

Keywords: superconducting ceramics, nanoparticles, structure, transmission electron microscopy.

GROWTH OF THE SCINTILLATING SINGLE CRYSTALS OF LSO:Ce BY THE BRIDGMAN-STOCKBARGER METHOD

Scientific-Technological Center of Physical Crystallography

Amaglobeli N.S., Namtalishvili M.I., Mikaberidze A.A., Nakaidze Sh.G., Jibladze M.I., Gabeskiria M.A.,
Razmadze Z.G. and Tsotskhalishvili N.V.

Ce-doped lutetium oxiorthosilicate (LSO:Ce) single crystals were grown by the Bridgman-Stockbarger method. The effective method for changing the growth conditions was considered. Absorption spectra of these crystals were studied.

Keywords: scintillator; crystal growth, LSO:Ce single crystals, absorption spectra.

A VERSION OF COMMUTATION OF THE THERMOELECTRIC SILICON-GERMANIUM ALLOY USING TUNGSTEN

Kashia V.G., Sherozia V.A. and Bokuchava G.V.

I.Vekua Sukhumi Institute of Physics and Technology

A version of commutation of the Ge_0.3-Si_0.7 alloy using the tungsten electrode is considered. It is suggested that the TiN layer and the free titanium film formed on its surface and subjected to boration should be used instead of the antidiffusion W₂C and connecting FeSi layers. Comparative testing of the thermobatteries containing the commutation transitions with the TiN and W₂C layers. The testing results demonstrated that application of the TiN+TiB₂ layer, instead of the W₂C one, increased the service life of the thermobattery.

Keywords: thermobattery, commutation transition, tungsten electrode, silicon-germanium alloy.

INVESTIGATION OF SOME REGULARITIES OF THE WORK DONE BY THE INDIUM SOURCE IN THE CHLORIDE HYDRIDE METHOD OF INDIUM PHOSPHIDE EPITAXY

Kutubidze B.V.

Georgian Technical University

The investigation results on the work done by the indium source in the chloride hydride method of indium phosphide epitaxy are presented. It is demonstrated that this method is characterized by the effect of self-cleaning, i.e. evaporation of the impurity from the source surface. The completeness and duration of the process depends on the conditions in the source zone. Application of the regularities studied allowed us to control efficiently the properties of epitaxial layers and to obtain the structure satisfying the requirements to the material for Gunn diodes and field transistors.

Keywords: epitaxial growth, indium source, indium phosphide, chloride hydride method.

COMPLEX DYNAMIC MODEL OF VIBROTRANSPOTATION FOR AVOIDING REVERSION OF THE MOVEMENT DIRECTION

Rostiashvili R.G.

Institute of Machine Mechanics

A complex dynamic model of vibrotransportation is considered. The conclusion has been drawn that, for the complex approach to controlling the movement direction and speed, it is essential to control the values of the parameters of the vibrodrive elastic system so that there should be avoided the values of length-wise, transverse, rotary, torsional vibratory frequencies which cause fluctuations in the process of vibromotion of granular materials till even stoppage or reverse motion. It is likely that nobody has managed to compose the algorithm describing the polysystem with consideration of the nonlinearity of physical-rheological parameters because of the abovementioned fact.

Keywords: vibrotransportation, dynamic model, reversion of the movement direction.

STUDY OF FATIGUE PROCESSES UNDER VIBRATION IN CONNECTION WITH THE PROBLEMS OF ERGONOMICS

Bagdoeva A.M and Rostiashvili R.G.

Institute of Machine Mechanics

The issues of planning the schedule of work and rest of the operation undergoing the effect of vibration are considered. There are presented the experimental results on the development of fatigue under vibration with different relations between the vibration action duration and the time of recovery.

Keywords: ergonomics, fatigue, vibration, operator, schedule.

ROTARY PUMP FOR THE COMBINED LOW CAPACITY WIND-ENERGY COMPLEX

Biliseishvili M.D., Bokuchava G.V., Kashia V.G. and Chanturidze V.G.

I.Vekua Sukhumi Institute of Physics and Technology

There are presented the development results of a rotary pump for the combined low capacity wind-energy water lifting complex.

It is showed that this rotary pump for pumping of neutral liquids (in particular, water) differs from the existing huge pumps. It is distinguished for its simple design and improved hydraulic characteristics (power consumption ≤0,6 W; capacity 1.0 m³·h^-1; pressure ≥80m of water pillar; mass <50 kg). It is suggested that there can be designed a version of the described rotor pump for agressive liquids.

Keywords: pump, rotor, wind energy plant, design, capacity, pressure, absorption.

CRIOGENIC PUMP

Dgebuadze G.N.

Georgian Scientific Association of Promising Technologies CRIOQUANTUM

Cryogenic pump NKS-1D is designed for formation and maintenance of high vacuum in the chamber preliminarily pumped to 10 Pa. The pumping speed of the pump by N₂ is equal to 1 m³/s; the pressure limit range is within 10⁵-10^-5 Pa; the liquid nitrogen flow rate - 7 l per day. The efficiency of the pump has been improved due to application of original technical approaches and optimization of the design. The latter was achieved on the basis of the theoretical analysis of the processes proceeding in the cryosorption pump, including tracing of movement trajectories of the molecules in the pump channels by the Monte-Carlo method.

Keywords: cryogenic pump, vacuum, pressure, adsorbent, sensor.

ON THE CORRECTION OF THE WEIGHT-CARRYING CAPACITY OF VEHICLES

Kharitonashvili V.A., Chlaidze Z.I. and Janiashvili V.J.

Georgian Technical University

The necessity in correction of the weight-carrying vehicles during their operation is substantiated. There is proposed the method for correction of the weight-carrying capacity with consideration of the essential traction and braking dynamics of the vehicle.

Keywords: vehicles, weight-carrying capacity, correction.

POLAROGRAPHIC DETERMINATION OF LEAD, ZINC, COPPER AND CADMIUM IONS IN BLOOD SERUM

Shavgulidze N.V., Gabrichidze O.A., Enukidze L.G., Lezhava N.G.,
Gerhard W. and Japaridze J.I.

Tbilisi State Medical University

R. Agladze Institute of Inorganic Chemistry and Electrochemistry

Institut für Experimentelle und Angevandte Physik, Universität Regensburg, Germany

The technique of simultaneous determination of Cu(II), Cd(II), Zn(II) and Pb(II) ions in small volumes (~1 ml) of blood and blood serum by differential-pulse polarography was developed. Even little amounts of microelements in the solution are characterized by sharp peaks, which are easily registered in the experiment. Using the technique suggested, there has been determined the distribution spectrum of microelements in blood and blood serum.

Keywords: blood, blood serum, polarography, determination of ions, lead, zinc, copper, cadmium.

THE TECHNIQUE OF NONDESTRUCTIVE CONTROL OF THE HUMID STATE OF CONCRETE OF HYDRAULIC ENGINEERING STRUCTURES

Khurtsilava A.K. and Roife V.S.

Kutaisi State Technical University

Moscow Research Institute of Construction Physics

The essence of the developed technique consists in the fact that, at the preassigned points of the hydraulic engineering structure (a dam), there are drilled boreholes where specially made columns from cement-sandy mortar, playing a role of the intermediate moisture carrier, are placed. Inside the columns, there are humidity and temperature sensors. Standard thermocouples are used as temperature sensors. The humidity sensors are specially made small-sized capacitor converters realizing the dielcometrical method of humidity measurement and representing punched plates of foiled glass-cloth-base laminate with the pattern of coplanar electrodes deposited photochemically. The terminals of the humidity and temperature sensors are connected to a few panels installed in accessible places of the structure. After connecting the appropriate measuring equipment to the sensors, the data on the humidity and temperature at the local points of the structure are available at any moment.

In the technique proposed, the most important and labour-consuming stage is fabrication of the columns and graduation of the incorporated humidity sensors.

Keywords: hydraulic engineering structure, concrete, nondestructive control, humidity, temperature.

THE METHOD FOR DETERMINATION OF PETROLEUM HYDROCARBONS AND THE STUDY OF THE POLLUTION LEVEL IN BOTTOM SEDIMENTS WITHIN THE GEORGIAN SECTOR OF THE BLACK SEA WATER AREA

Gvakharia V.G., Gelashvili N.E., Gvakharia T.A., Adamia T.M., Janashvili N.D. and Maisuradze G.V.

Scientific Research Firm "Gamma"

The results of investigation of total petroleum hydrocarbons (TPH) in bottom sediments of Georgia's sector of the Black Sea water area are presented. The background concentrations were determined. With consideration of the peculiarities of the Black Sea, the currents existing in this area, the type of bottom sediments, the depth etc., the distribution of TPH was studied, which, in case of pollution of the water area with oil and petroleum products, will allow us to determine the direction of expansion of the pollution and zones of its accumulation and, thus, to estimate the level of local pollution. Basing on the obtained data on the background concentrations of TPH, it is possible to implement environmental monitoring, to estimate the risk factor of pollution, and to establish the level of anthropogenic pollution.

Keywords: hydrocarbons, oil, bottom sediments, pollution, the Black Sea.

INVESTIGATION OF COMPLEXATION OF ZINC WITH FULVIC ACIDS ISOLATED FROM NATURAL WATERS

Makharadze G.A. and Chkhikvishvili N.I.

Iv. Javakhishvili Tbilisi State University

The complexation of zinc with fulvic acids isolated from the River Mtkvari was studied by the solubility method (pH=8, m=0.1 (KNO₃)), solid phase suspension of zinc oxide). The stability constant of zinc fulvic complex was calculated (b=1.3·10⁵). It was shown that it is expedient to use the average molecular weight of the "initial associate", the value of which does not depend on the value of pH (М_w=1350). There is proposed the formula for calculation of the stability constant of fulvic complexes of heavy metals. It is demonstrated that the application of hydrolysis constants to computation of the stability constant of metallic fulvic complexes is not correct.

Keywords: zinc, fulvic acids, fulvates, solubility method, stability constant, initial associate.

ON THE PRODUCTS OF THE HYDROCHEMICAL REACTION BETWEEN SODIUM TETRATHIOANTIMONATE (V) AND SOME OXIDANTS

Rukhaia K.J., Didbaridze I.S., Kikalishvili M.I., Rusia M.Sh. and Gigauri R.D.

Iv. Javakhishvili Tbilisi State University

The possibility of the hydrochemical reaction between sodium tetrathioantimonate (V) and various oxidants was studied. It is demonstrated that, as a result of the reaction of sodium tetrathioantimonate (V) with oxygen, ozone and hydrogen peroxide, sodium metaantimonate (V) and elemental sulfur in the monoclinic form are formed. The obtained products were studied by elemental analysis and physical-chemical methods (IR spectroscopy and radiography).

Keywords: sodium tetrathioantimonate, oxidants, hydrochemical reaction.

ON THE PRODUCTS OF THE HYDROCHEMICAL REACTION BETWEEN DIANTIMONY PENTASULFIDE AND LITHIUM HYDROXIDE

Rukhaia K.J., Didbaridze I.S., Kikalishvili M.I., Rusia M.Sh. and Gigauri R.D.

Iv. Javakhishvili Tbilisi State University

The hydrochemical reaction between diantimony pentasulfide and lithium hydroxide was studied. The following optimal conditions of the reaction were established: the molar ratio of the reactants LiOH:Sb₂S₅:H₂O=9:2:23 and conducting of the process at the boiling temperature of the reaction mass. It is demonstrated that generally the products of the reaction are LiSbO₃×2.5H₂O and Li₃SbS₄×9^.5H₂O. The reaction between the obtained products and strong acids was studied. As a result, antimony (V) chalcogenides (Sb₂O₅×3.5H₂O and Sb₂S₅) were derived.

Keywords: diantimony pentasulfide, lithium hydroxide, hydrochemical reaction.

ON A POSSIBILITY OF HYDROCHEMICAL CONVERSION OF ANTIMONY ORES FROM KAZBEGI REGION, GEORGIA

Gigauri R.D., Gvazava N.R., Matiashvili M.G., Khidesheli A.V. and Sikharulidze L.K.

Iv. Javakhishvili Tbilisi State University

A possibility of practical application of antimony ores from Kazbegi Region, Georgia, was studied. As the initial substances, antimonates containing 88.83% and 96.32% of the basic substance (Sb₂S₃) were taken from ore manifestations Elia and Sajoge, respectively. It was established that, at hydrochemical treatment of the abovementioned samples with elemental sulfur in the presence of the equivalent amount of sodium hydroxide, oxidation of antimony (III) with formation of sodium metaantimonate (V) and tetrathioantimonate (V) with high yields occurs. The causalities and consequences of the proceeding reactions are explained.

Keywords: antimony ores, hydrochemical conversion, sodium metaantimonate, sodium tetrathioantimonate.

THE EFFECT OF AQUEOUS SOLUTION OF SULFURIC ACID ON THE GLASS OF SYSTEM R₂O-MnO-B₂O₃

Mshvildadze M.J. and Cheishvili T.Sh.

Georgian Technical University

The interaction between the glass of system R₂O-MnO-B₂O₃ and the aqueous solution of sulfuric acid is considered. It is demonstrated that the glass containing 20 mol% and more of MnO manifests the resistance to the reagent which is not characteristic of borate glass. Manganite structure groups in the glass, the amount and form of which are determined by the glass composition and the content of manganese oxides, are assumed to be responsible for the degree of resistance.

Keywords: borate glass, manganese oxide, sulfuric acid, chemical resistance.

INFLUENCE OF ULTRAVIOLET BEAMS ON PHYSICAL AND MECHANICAL PROPERTIES OF POLYETHYLENE FILM

Bochoidze I.G. and Gachechiladze M.V.

Kutaisi Technical University

The experiments have shown that the influence of ultraviolet beams reduces such basic physical-mechanical characteristics as breaking stability and relative length of polyethylene film widely used in the trading network.

Changes in these characteristics depend on the thickness of the film, and duration and intensity of radiation. It was established that the effect was clearly manifested at the beginning of radiation by ultraviolet beams. It is recommended to use the ultraviolet radiation for fixation of geometric dimensions in the process of production of fiber thread from the polyethylene film.

Keywords: polyethylene film, ultraviolet beams, physical-mechanical properties.

ON THE POSSIBILITY OF APPLICATION OF BENTONITES FOR PRODUCTION OF MEDICINAL TEXTILES

Pailodze N.O., Buadze Е.P. and Sharabidze M.R.

Kutaisi State Technical University

The analysis of available literature on application of textile materials in different fields of medicine is presented. The possibility of application of bentonites in medicine is shown. The combination of these two approaches - medical textiles and bentonites - enables to expand the fields of application, which is a rather urgent task. It is noted that, at the Department of Chemical Technology of Textile and Light Industry of Kutaisi State Technical University, the investigations are being performed with the purpose of obtaining medical and cosmetic textile materials.

Keywords: medtextile, bentonite, cosmetics.

THE EFFECT OF THICKENERS MODIFIED WITH BENTONITES ON THE PROCESS OF PRINTING OF NATURAL SILK FABRICS

Ukleba M.R., Buadze E.P. and Sharabidze M.R.

Kutaisi State Technical University

A brief characteristic of bentonites is given. The ability of fixing the active dyes on fabrics from natural silk at printing with application of various versions of modified thickener "bentonite-manutex" is investigated. It was established that the degree of fixing was not worsened, the color was bright and rich. At studying the durability of coloring, it appeared that the durability characteristics were not worsened.

Keywords: modified thickener, bentonite thickener, printing, silk, manutex.

medtextile ON THE BASIS OF GEORGIAN TRADITIONAL NATURAL MEDICAL PREPARATIONS

Sharabidze М.R.

Kutaisi State Technical University

The intensive work was carried out in order to prepare the ointments and, on their basis, textile materials having various specific properties for medical purposes. Preparation of the medical textile facilitating healing of wounds, burns, inflammations, and pains is proposed. The development of the technology for fabrication of this medical textile, the study of its properties, and its testing in clinical conditions are stipulated.

Keywords: medtextile, ointments, gels, healing of wounds, burns and inflammations.

CHANGES IN THE AMOUNT OF ANTHOCYANS AND THE COLOR INTENSITY OF DRY PINK TABLE WINE MATERIALS DURING STORAGE

Ebelashvili N.V.

Research Institute of Horticulture, Viticulture and Wine-Making

There have been studied changes in the amount of anthocyans and the color intensity of dry pink table wine materials during storage at 11-21ºC for 18 months. The wine materials were prepared using the fresh-pressed pomace of red grapes (varieties Saperavi, Tavkveri and Asuretuli Shavi) and the must of variety Rkatsitely. It was determined that, after 6-month storage, the amount of anthocyans in the wine materials decreased by 34.1-41.5% as compared with the initial amount, and the color intensity - by 36.2-39.8%. After 15-month storage, the amount of anthocyans decreased by 52.4-61.1%, and the color intensity - 49.1-55%. After 18-month storage, the amount of anthocyans in the wine materials made up 10.5-17.3 mg/dm³ only. Correspondingly, the nice pink color of the wine materials faded into pale pink with a yellowish hue.

Keywords: wine materials, anthocyans, color intensity, storage.

STUDY OF ORGANIC ACIDS IN PINK DRY TABLE WINES BY HIGHLY EFFECTIVE LIQUID CHROMATOGRAPHY

Ebelashvili N.V.

Research Institute of Viticulture, Viniculture and Wine-Making

The quantitative content of organic acids in pink dry table wines prepared from local red grapes Tavkveri and Shavkapito was studied using highly effective liquid chromatography. In wine samples, were identified and determined quantitatively the following nonvolatile acids: oxalic, tartaric, malic, lactic, citric and succinic, and from volatile acids - acetic acid. The wine samples differed in the content of organic acids. In the wine sample from grape variety Tavkveri, the content of tartaric, malic and succinic acids was higher than in the wine sample from grape variety Shavkapito. The content of oxalic, citric and lactic acids was higher in the wine sample from Shavkapito than in the sample from Tavkveri.

Keywords: pink table wines, organic acids, content, liquid chromatography.

RESISTANCE OF BACTERIOPHAGES TO SOME PHYSICAL AND CHEMICAL ACTIONS

Kebadze N.M., Nadirashvili N.Sh., Alavidze Z.I., Goderdzishvili M.G., Kvatadze N.A., Tsitlanadze G.V., Meipariani A.N. and Katsarava R.D.

Center for Medical Polymers and Biomaterials, Georgian Technical University

G. Eliava Institute of Bacteriophages, Microbiology and Virology

The resistance of bacteriophages - both the filtrate of phagolysate (serial combined preparation Pyophage) and water solutions of purified bacteriophages - towards ultrasound and high-speed mechanical mixing (disintegrating factors), and some hydrolytic enzymes (hydrolases like trypsin, a-chymotrypsin, and lipase) was investigated. It was established that ultrasound caused inactivation of the phages after short-term exposure (0.5-3 sec), the phagolysate filtrate stability being somewhat higher as compared with purified phages. The mechanical disintegration turned out to be much milder and did not affect the activity of bacteriophages including the purified ones. The experiments showed high stability of bacteriophages (including the purified ones) towards the mentioned enzymes. Among the surfactants used Tweens hardly affected the activity of purified phages for 24 hours while sodium dodecyl sulfate decreased the phage titer by a factor of 10 under the same conditions.

Keywords: bacteriophages, resistance, physical and chemical actions.

ON THE DUALITY OF NOTION "CONSCIOUSNESS-MATTER" AND THE PROBLEM OF CREATION OF THE HOMOCYBERNETICUS BY THE HUMANITY

Khvedelidze M.A.

Institute of Cybernetics

Georgian Engineering Academy

International Informatization Academy

Completing the analysis of the duality of polar-pair properties of matter, in particular energy-information ones, in the form of the concept of the "consciousness-matter" (CCMD), the author has tried to interpret the problem already facing the humanity - creation of the "homocyberneticus", which is similar to the task having faced the Supreme Mind ages ago - to create finally the man for creating artificial systems by himself. By the "homocyberneticus" a new kind of the man integrated with the "implanted" computer is meant.

Keywords: creation self-organizatin, concept of the duality, "consciousness-matter", artificial systems.

ON THE POSSIBILITY OF APPLICATION OF THE METHOD OF ELECTROPUNCTURE FOR TREATMENT OF PATIENTS SUFFERING LUMBAR-SACRUM OSTEOCHONDROSIS WITH THE PRONOUNCED PAIN SYNDROME

Dolidze I.D., Kharebava E.I. and Feroyan E.V.

Georgian Academy of Physical Training and Sport

National Centre of Therapy

There are presented the investigation results on the application of electropuncture apparatus DENAS for relieving the pain syndrome in the patients suffering lumbar-sacrum osteochondrosis. Twenty-four patients (16 women and 8 men) suffering lumbar-sacrum osteochondrosis in the acute phase were examined. The investigation results pointed to high analgetic efficiency of apparatus DENAS.

Keywords: electropuncture, apparatus DENAS, lumbar-sacrum osteochondrosis, pain relief.

ON THE VALEOLOGICAL APPROACH TO PSYCHOPHYSICAL DEVELOPMENT OF BABIES

Dolidze I.D. and Imnaishvili E.G.

Georgian Academy of Physical Training and Sport

The dynamics of psychophysical development of babies in two groups (trained by the method of dynamic gymnastics and untrained) is considered in the context of the valeological approach.

By the indexes of baby's physical development (weight, Erisman's index etc.) the psychoemotional state of the baby was estimated. Psychopedagogical training of mothers was also taken into consideration. The three factors (gymnastics performed by kinesiatrists, and pedagogical and psychological training of the mother) were assumed as a generalized approach with the valeological procedure.

When the dynamic gymnastics was used and the optimum daily routine (sleeping, feeding, being awake; the effective use of natural factors: fresh air, sunshine, bathing etc.) was chosen, the babies gained weight rapidly, were more active in motions, and expressed more emotions. In this case, good dynamics of Erisman's anthropometric index was observed.

On the basis of the investigation carried out, the conclusion is drawn that it has been essential to pay special attention to pedagogical training of mothers, to their knowledge about physical training of babies, and to raising their psychological motivation with the aim of harmonical development of babies. With this purpose, a special program on upbringing of babies for mothers will be worked out with application of the new approach based on neonatal valeology, which will result in upbringing of a healthy generation.

Keywords: valeology, baby, physical training, psychophysical development.

ON THE PHENOMENON OF TSINTSADZE'S REAGENT

Tsintsadze G.V., Mgeladze N.Z. and Chagunava R.V.

Georgian Technical University

An original method of preparation of molybdenum blue known as Tsintsadze's reagent is considered. The originality of this method consists in that its author Dr. Shalva Tsintsadze excluded the possibility of the reductant excess in the final product. For this purpose, as a reductant he used pure powder of metallic molybdenum, the excess residue of which was easily separated from the reagent by filtration. Besides, he used pure molybdenum anhydride instead of ammonium molybdate. By dissolving molybdenum anhydride in hot concentrated sulfuric acid, the problem of precise dosage of six-valent molybdenum in the solution was solved. For preparation of molybdenum blue (1 l), 10.11 g MoO₃, 15 N H₂SO₄, and 11.78 g of metallic molybdenum were used. The process proceeded in the boiling solution. The evaporated water was compensated by adding distilled water. In recent years, similar analytical methods known as Tsintsadze-Markova's method and Dittmer's reagent, which does not actually differ from Tsintsadze's reagent, have been suggested.

Keywords: molybdenum blue, preparation, Tsintsadze's reagent.

КРАТКИЕ СООБЩЕНИЯ

DIFFUSION MISMATCH IN SEMICONDUCTOR HETEROSTRUCTURES

Bychkova L.P., Gegiadze G.G., Davarashvili O.I., Enukashvili M.I.,

Darsavelidze G.Sh., Kutelia E.R., Mamedov T.S. and Tecer L.N.

Iv. Javakhishvili Tbilisi State University

Georgian Technical University

Institute of Physics of the NAS, Azerbaijan

Karaelmas University, Zonguldak, Turkey

Оur analysis showed that, in isoperiodic semiconductor heterostructures, appears diffusion mismatch in active layers, especially in nonstechiometric materials with high values of diffusion coefficients. The increase in threshold current, in this case, can be prevented by light doping of active layers or changing the profile of components in the heterostuctures.

Keywords: diffusion mismatch, semiconductor heterostructure, laser, threshold current, doping, profile of components.

PHOTON STRUCTURE OF THE BASIS OF PHOTOREFRACTIVE CRYSTALS

Karakozov K.G., Mshvelidze G.G. and Chanturia G.F.

Institute of Cybernetics

A method of formation of the photon periodic structure on the basis of electrical-optical crystals type LiNbO₃ is suggested. A periodic change in the refractive index is caused with the help of the mask irradiated by laser radiation at wavelength 441.6 nm with the power density of 0.02 W/cm². In combination with nanotechnology, the suggested method will allow fabrication of three-dimensional photon systems, in particular photon crystals on the basis of photorefractive media.

Keywords: crystals, refractive index, photoinduction, periodic structure, heat treatment, photorefraction.

ON AN APPROACH TO DETERMINATION OF INTEGRATED ARRANGEMENT OF PROCESS ELEMENTS OF FLEXIBLE PRODUCTION SYSTEMS OF THE "WATER INDUSTRY"

Giorgadze P.Sh.

Georgian Technical University

A possible approach to the problem of integrated arrangement of process elements of flexible production systems of the "water industry" is proposed. The criterial function of the solution to the problem was found. The function allows us to determine the rational variant of arrangement of the production process elements.

Keywords: water industry of Georgia, flexible production system, production process elements, arrangement, criterial function.

PLANNING OF POTENTIAL MANUFACTURING LOCATIONS OF THE WATER INDUSTRY OF GEORGIA BASED ON THE ANALYSIS OF SOLUTIONS

Giorgadze P.Sh. and Tsikhelashvili Sh.Z.

Georgian Technical University

The problem of planning of potential manufacturing locations of the "water industry" of Georgia is considered. The formalized procedure of planning the manufacturing locations is proposed. In this search, the capabilities of contemporary business and logistics were taken into consideration.

Keywords: water industry of Georgia, analysis of solutions, manufacturing locations.