SUMMARY

Summary

On the critical thickness in AIVBVI heterostructures under diffusion mismatch

Pashaev A.M., Davarashvili O.I., Aliyev V.A., Bychkova L.P., Enukashvili M.I. and Zlomanov V.P.

Iv. Javakhishvili Tbilisi State University

Institute of Physics of NAS of Azerbaijan, Baku

M.Lomonosov Moscow State University, Russia 

Diffusion mismatch in AIVBVI heterostructures at epitaxy temperature is formed due to the mutual diffusion of components of the emitter and the active area. If the semiwidth of the mismatched region is more than the  critical thickness, the probability of relaxation of the corresponding pressure is high. This raises the  threshold current in lasers, and, in photodetectors, low sensitivity is realized. The effective maximum mismatch or the effect caused by it can be reduced, on the one hand, by changing the profile of the structures in heterostructures when they approach the emitter and the active area and, on the other hand, by doping the active area with the impurities expanding the limit of elasticity.

Keywords: heterostructures, diffusion mismatch, critical thickness.

 

ELECTRICAL CHARACTERISTICS OF Fe/GaAs STRUCTURES                                                                                                      

 

Mikelashvili V.T., Kvitciani O.R., Laperashvili D. L. and  Laperashvili T.A.

 

Institute of Cybernetics

 

Abstract. The Fe/GaAs contact has attracted considerable interest among researchers due to both its magnetic properties and the insignificant lattice mismatch the between the metal and the semiconductor. The formation of Schottky barrier and its characteristics, as well as of metallic interconnections, are strongly influenced by the structure and the disorder of the interface. The Schottky barrier was obtained by electrochemical deposition of ferromagnetic metal - Fe on the electrochemically etched surface of GaAs. The aqueous solution of iron chloride was used for deposition of Shottky contact. The ohmic contact was made by sintering of metallic indium in hydrogen. Current-voltage and capacitance-voltage characteristics of the obtained Schottky diode based on the Fe/GaAs barier contact were studied. The results of investigation of the current flow mechanism in the observed structures are presented.

Keywords: Fe/GaAs structure, ferromagnetic metal, semiconductor, electrochemical deposition, Schottky barrier.

 

Summary

Hydrogen atom transfer from aromatic amines to the molecules of electron acceptors in the triplet state

Kokrashvili T.A., Kvintradze V.I. and Tsirekidze M.A.

Georgian Technical University

The values of enthalpy, entropy and free energy of prototropic equilibrium in nonrelaxation triplet exciplexes were obtained. It was established that, with increasing temperature of the solution, the yield of neutral radicals increased, while the yield of triplet exciplexes decreased. It is demonstrated that polar triplet exciplexes are efficiently quenched by secondary aromatic amines through the hydrogen atom transfer with the formation of corresponding neutral radicals.

Keywords: triplet exciplexes, triplet state, electron acceptors, electron transfer, hydrogen atom transfer.

 

 

Summary

kinetics of quenching of polar triplet exciplexes by nitroxylic radicals

Kokrashvili T.A., Tsirekidze M.A., Kvintradze V.I. and Pokleba A.K.

Georgian Technical University

The constants of the rate of quenching of polar triplet exciplexes by nitroxylic radicals were determined. It is demonstrated that quenching of polar triplet exciplexes by radicals is efficiently performed in the triplet complex of collision by accelerating the intercombination transfer into the singlet exciplex located at a lower energy level.

Keywords: triplet exciplex, quenching, triplet state, nitroxylic radical.

 

 

Summary

The effect of magnetic field on the kinetics of triplet exciplex destruction

Kokrashvili T.A., Kvintradze V.I. and Pokleba A.K.

Georgian Technical University

The effect of magnetic field on the ion-radical yield in the systems of the type  of quinone-iodine-replaced aniline was studied. It is shown that, in the solutions of medium polarity, the basic contribution to the triplet exciplex destruction under study was made by the process involving the triplet-singlet transitions at the expense of magnetic electron-nuclear interaction.

Keywords: triplet exciplex, kinetics, destruction, magnetic field, ion-radical pair.

SummarY

ON strongly and weakly separable Fisher statistical structures

Aleksidze L.T.,   Zerakidze Z.S.  and Tsiklauri E.M.

Gori University

In the present paper, we prove that weakly separable Fisher statistical structures are strongly separable Fisher statistical structures, and orthogonal Fisher statistical structures are strongly separable Fisher statistical structures.

Keywords: statistical structures, strong separation, weak separation.

 

Summary

ON the Construction OF Fisher statistical structures

Aleksidze L.T. and Zerakidze Z.S.

Gori University

In the present paper, we construct Fisher orthogonal and weakly separable Fisher statistical structures having maximum  possible power.

Keywords: statistical structure, orthogonal structures, strong separation, weak separation.

 

 

SUMMARY

A grid of subgroups and the geometry hall is  of W-power groups

Chabashvili M.Z. and Bokelavadze T.Z.

Iv. Javakhishvili Tbilisi State University

It is demonstrated that the basic theory of affine geometry holds for Hall’s W-power groups if W is a ring of principal ideals. Relevant examples are cited.

Keywords: affine geometry, Hall groups, W-power groups, grid of subgroups, nilpotent groups.

 

INFLUENCE OF LITHIUM AND BORON DOPING ON the SUPERCONDUCTING TRANSITION IN Bi-2223 Superconducting CERAMICS

 

Margiani N.G., Zhghamadze V.V., Mzhavanadze I.A., Sabashvili N.G. and

Shurgaia G.A.

 

Institute of Cybernetics

 

Abstract. The influence of lithium  and boron doping on the superconducting transition was investigated in       Bi-based high-Tc 2223 ceramics. It was found that the Bi-2223 samples doped with Li and B transform into the low-Tc Bi-2212 phase. In the Li-doped Bi-2223 samples, a nonmonotonous change in the critical temperature takes place, while the boron doping leads to the gradual decrease in Tc with the increasing dopant content.

Keywords: superconducting ceramics, doping, superconducting transition.

 

 

INFLUENCE OF BORON DOPING ON the RESISTIVE TRANSITION

IN Bi(Pb)-Sr-Ca-Cu-O  GLASS CERAMICS

 

Margiani N.G.,  Papunashvili N.A., Shurgaia G.A. and Zhghamadze V.V.

 

Institute of Cybernetics

 

Abstract. The undoped and boron-doped Bi(Pb)-Sr-Ca-Cu-O glass-ceramic samples with nominal composition Bi1.7Pb0.3Sr2Ca2Cu4BxOy  (x=0 and 0.3) were synthesized by the melt-quenching method. Crystallization behavior and  resistive transition of the prepared material were examined. The addition of  B2O3 to the Bi-based system suppresses the crystallization of the high-temperature 2223 phase and sharply decreases the critical temperature. The normal state resistivity values of the boron-doped samples are an order of magnitude larger than those of undoped ones.

Keywords: high-temperature  superconductivity, Bi(Pb)-Sr-Ca-Cu-O glass ceramics, resistive transition, boron doping.

 

PREDICTION of the  CORROSION RESISTANCE OF Ti-Ni-Cr ALLOY Alloy IN PHYSIOLOGICAL SOLUTION

 

Gozalishvili E.I., Mikaberidze M.P., Ramazashvili D.R., Akhvlediani L.A. and Gigitashvili T.G.

 

F.Tavadze Institute of Metallurgy and Materials Science

 

Abstract. The prediction of long-term corrosive behavior of Ti-Ni-Cr alloy was carried out at 37oC in the physiological solution (0.9% NaCl) with application of electrochemical and corrosion tests, spectral chemical analysis and statistical methods of experimental data analysis. The obtained equation of time dependence of the corrosion rate is expressed as C = 0.0038 exp (-0.045τ). The time dependences of corrosion potentials and rates and the absence of pitting corrosion allows forecasting the high corrosion resistance of alloy corresponding to the  passive state during long-term exposure. The chemical spectral analysis confirmed the calculated and predicted low values of corrosion rates and showed that, during the long-term exposure, the  quantity of titanium ions passed the into solution could be neglected.

Keywords: corrosion resistance, prediction, alloy, electrochemical calculation, passivity, potential, corrosion rate.

 

SUMMARY

Zurab Bedia’s phenomenon

Prangishvili A.I., Tsivtsivadze T.I., Chavchanidze V.V., Chigogidze N.Sh., Kveselava I.S., Skhiladze R.A., Gobechia G.G. and Sulakvelidze G.A.

Georgian Engineering Academy

Georgian Technical University

The article is devoted to Zurab Bedia – a unique phenomenon, who possesses a powerful bioenergetic potential capable of lighting the electric bulbs of different power. The historical experience of hushing up and hindering the investigations of natural phenomena has been analyzed. It is justified that such phenomena need thorough investigation in the interests of science and human activities. The necessity in establishing and financing a specialized laboratory for studying such phenomena and designing the special portable instruments – analyzers of external fields of biological objects is emphasized.

Keywords: bioenergy, phenomenon, biometer, solion-liquid elements.

 

 

SUMMARY

ON A PROCEDURE OF SOLVING THE  EQUATION FOR DETERMINATION OF

THE CONTENT OF GAS

Telia T.N. and Chkhaidze D.T.

Batumi State University

The percent content of dissociated co2 was determined by the method of successive approximations with the help of Goal seek dialog window in MS Excel. The procedure of determination of high-order roots was developed.

Keywords: carbon dioxide, content, nonlinear equation, solution, procedure.

 

 

SUMMARY

A METHOD OF OPTIMIZATION OF THE PARAMETERS OF CRANK MECHANISM

Telia T.N.

Batumi State University

A mathematical model of operation of the crank mechanism was constructed in MS Excel. The proposed model provides the automatic determination of optimal values of mechanism parameters satisfying the  given initial conditions.

Keywords: crank mechanism, mathematical model, mechanism parameters, optimization.

 

SUMMARY
ON A MODEL OF DATA TRANSMISSION VIA THE

COMMUNICATION CHANNELS SUBJECT TO TRANSIENT FAILURES

Mikadze I.S. and Mayer A.A.

Georgian Teachnical University

The problems of faultless data transmission via the channels subject to transient external effects of random duration are discussed. The moments of emergence of these effects are distributed by the Erlang law. It is assumed that the duration of interfering factors and the methods of their elimination, as well as the duration of shot transmission, are distributed by a random law. There was obtained the generalized state for the probability of the message being transmitted without distortion and for the given time.

Keywords: communication channel, transient failure, data transmission, model.

 

Summary

On the efficiency of the Use of engineering systems  Subjected to failures

Mikadze I.S. and Mayer A.A.

Georgian Technical University

An original method of determination of the rate of use of engineering systems which are covered with instrumental control incompletely is proposed. The method takes into consideration the reliability of control instruments, the time of reliable control at regular checks and the time of recovery. The obtained results allow determining the optimal value of the operating rate of the system just as with account for working costs, so without regard for them.

Keywords: engineering systems, reliability, rate of use, instrumental control.

 

summary

TURBULENT  LIQUID  FLOW  IN  A  CIRCULAR  TUBE  WITH  UNIFORM INJECTION  THROUGH POROUS  WALLS

Tsutskiridze V.N.

Georgian Technical University

The incompressible liquid flow in a porous-wall tube was calculated using a three-parametric turbulence model. As a result of the calculations made, the effect of injection on the distribution of averaged and pulsation characteristics of motion over the tube section and length is defined.

Keywords: liquids, turbulent flow, porous walls, injection.

 

 

SUMMARY

on the problem of correction of single errors in linear code 3B4B

Nanobashvili D.V. and Nanobashvili V.V.

Georgian Technical University

There are considered the problems of correction of single errors in linear code 3B4B. There are shown the possibilities of enhancement of efficiency of the correction method, proposed by the authors earlier, based on the detection not only of forbidden combinations but also of partially false allowed ones in the linear signal. This method allows correcting not 44% of errors, as it happens in the case of detection of only forbidden combinations, but 63% of errors, which significantly improves the quality characteristics of optical-fiber telecommunication systems.

Keywords: linear code 3B4B, disparity, allowed combinations, forbidden combinations, errors, correction.

 

 

SUMMARY

INFORMATION  STORES  IN THE  BANKING  SYSTEM

Petriashvili  L.N.,  Kiknadze  M.G.  and  Gvaramia  E.G. 

Georgian Technical  University

The  refinement  of  the  system  of  processing,  analysis  and  representation  of   information  must  be  organized  on  the  bases  of  knowledge  of  concrete  demands,  addressed  information  representation  and  improvements  in  methodological  tools  of  analysis.  The creation  of the  systems  of  operational  standards  of  the  bank  and  of  decision-making  is  associated with the formation of the information  store  by  applied  technologies. 

Keywords: information  store,  banking  system,  operational  standard,  decision-making.

 

SUMMARY

Basic trends in diagnosing the financial status of georgian enterprises

Magradze M.D.

Georgian Technical University

The problems associated with the necessity in diagnosing the financial status of the enterprise are considered. Special attention is given to the methodical approaches to the realization of diagnostics, the problems of the cycle of production development, the analysis of the financial status of the enterprise, the necessity in management - marketing renewals etc. The required computation of the financial indices of the enterprise is presented.

Keywords: enterprise, financial status, diagnostics, basic trends.

 

DATAWARE  AND LEGAL REASONING

OF THE ENVIRONMENTAL MONITORING

 

              Shatberashvili I.G., Chkhartishvili A.G., Japaridze L.G.,

              Tsitskishvili M.M., Ninua T.L., Osidze I.G. and Tsitskishvili M.S.

 

     Georgian Academy of the Ecological Science

 

Abstract. Today, in resolving the tasks of environmental monitoring in practice, the basic limiting factors are economic - cost estimations. Hence the issues of typisation and statistical reliability are of primary importance. It is necessary to understand the unity and the contrast of the  problems of monitoring for various environments. From the point of view of the theory of informational science, at the present stage, the problems of monitoring should be considered joinly for all three natural environments (air, ground, water). It is justified by uniform operating administrative-legal basis and uniform methodology of the theory of informational science as well as by  close coherence of the environments.

Keywords: environment, ecology, monitoring, dataware, legal reasoning.

 

Summary

Ecological PROBLEMS OF the CAUCASUS AND the aims of

MODELING of SUSTAINABLE FUTURE OF the REGION

Chkhaidze N.Z., Tsitskishvili M.S., Tsitskishvili M.M. and Japaridze L.G.

UNESCO Chair of Ecological Education and Management, Georgian Technical University

The ecological crisis, the main alternative of the progress of modern civilization, has posed a number of problems, including educational ones, to the developing world community. In this work, the basic criteria of differentiation of ecology from other natural sciences – the existence and the indissoluble unity of "ecological triad" are formulated; the basic problems of ecology of the Caucasus are revealed, and hence  the basic aims of environmental protection for achievement of sustainable development of the region are formulated.

Keywords: environmental protection, ecological problems, sustainable future, ecological triad, modeling.

 

SUMMARY
ON THE BASICS OF MANAGEMENT OF TECHNOGENIC AND ECOLOGICAL

SAFETY AND RISKS
Chkheidze N.V. and Tsikhelashvili Z.I.

Georgian Technical University

Successive stages in the management of technogenic and ecological safety and risks are discussed in accordance with the essence and the function of such management. It is emphasized that, at the regional level (cities, provinces etc,), the safety and risk management must mainly be aimed at the resolution of perspective long-term tasks, the formation of target settings and strategies of risk management and also at working-out of essential legal-normative bases for ensuring the high level of human life. The approaches of functional subsystems and measures to the corresponding problems on providing the technogenic and ecological safety and the risk management for making the adequate management decisions under the conditions of emergency situations are discussed.

Keywords: emergency situation, organizational basis, technogenic safety, ecological safety, risks, management.

 

SUMMARY

On some physical-chemical  properties of nanomodified zeolites used in the practice of desiccation of organic liquids

Andronikashvili T.G., Eprikashvili L.G., Kordzakhia T.N., Pirtskhalava N.V.,

Zautashvili M.G. and Dzagania M.A.

P. Melikishvili Institute of Physical and Organic Chemistry

There are discussed some issues of physical-chemical properties of the most studied zeolites such as the zeolites of groups A, X and Y, mordenite, erionite, clinoptilolite-heulandite, phillipsite and chabazite. It is demonstrated that their molecular-sieving properties depend not only on the geometry of channels, but also on the chemical composition of crystals and, first of all, on the origin and the number of cations compensating the negative charge of alumosilicate lattice.

Keywords: zeolite, molecular sieves, physical-chemical properties, mordenite, erionite, clinoptilolite, heulandite, phillipsite, chabazite.

 

 

Summary

 Eh-sensitive GLASS ElectRodes with Electron Conductivity

Dolidze V.A. and Dolidze A.V.

Georgian Technical University

The state of art and the prospects of designing of glass electrodes with electron conductivity for measurements of redox potentials of solutions under different conditions are discussed. The compositions of developed Eh-sensitive electrode glass and the electrodes produced on its basis commercially are described. The possible influence of cations on the electrode (hydrogen, metallic, oxidation) functions of the glass is discussed. The results of the study on the positions of isomorphic substitution of atoms in crystals are given.

Keywords: ionometry, redoxmetry, glass electrodes, electron conductivity, properties.

 

   

 

 

Summary

Metallographic analysis of the welds of some steels

Dadianidze G.A., Khutsishvili M.G. and Sulamanidze A.K.

F. Tavadze Institute of Metallurgy and Materials Science

Georgian Technical University

Georgian Engineering Academy

Microstructural studies on the welds of ADS steel of quality DI-46 and DI-47 at different speed of cooling (from 150/s to 1800/s) were performed. It is shown that the increase in speed causes changes in the structure and the hardness of steels . By X-ray microanalyses, it was established that the welds of steels DI-46 and DI-47 contained titanium carbides TiC and Ti(C,N).

Keywords: welding, steel, welds, titanium carbide, metallographic analysis.

 

Summary

The study on the effect of coating on the weld strength

Sulamanidze A.K., Khutsishvili M.G. and Dadianidze G.A.

Georgian Technical University

F. Tavadze Institute of Metallurgy and Materials Science

The results of testing showed that, at welding, steels of quality DI-46 and DI-47 tend to forming the cooling cracks. Though, the weld strength of those steels could be controlled by varying the weld metal  composition with the help of coatings.

Keywords: welding, steel, welds, coating, weld strength.

 

 

Summary

On promising high-tech  methods  of  solid  fuel combustion

Kevkhishvili  N.a.,  natsvlishvili  t.sh  and  kevkhishvili  v.A. 

Georgian Technical University

A  brief  review  of  the methods of  combustion  of  low-reaction  solid  fuel  is  presented.  The  advantages and  the drawbacks of these methods are assessed. their  applications  are  discussed.  The  advantages  of  solid  fuel  combustion  by  using  the fluidized  bed  are  justified.

Keywords:  solid  fuel,  fluidized  bed,   combustion,  perspectives.  

 

 

 

Summary

The methods of water  treatment in  horizontal  settling chambers

Mamedov akhmed shirin ogli

Research and design institute “sucanal”, baku, Azerbaijan

The problems of treatment of highly muddy water for farming water supply in arid zones are discussed. Under such conditions, for treatment of highly muddy surface waters, traditional radial and horizontal settling chambers are used. In this paper, a new efficient construction of the settling chamber is offered. The constriction is described in detail. The specific feature of the chamber is that its middle wall is equipped with deep gates, which are located at the level of silting of the chamber.

Keywords: muddy water, water treatment, horizontal settling chamber, construction.

 

Summary

On the toxicity of exhaust gases of Diesel ENGINES AND THE WAYS OF ITS REDUCITON

Purtskhvanidze G.N. and Lomidze A.N.

Akaki Tsereteli State University, Kutaisi

The harmful impact of automobile transport on the environment  and the human health is discussed. The sources and the concentrations of toxic substances in exhaust gases of internal combustion engines are described . The effect of the process of filling of cyinders on the power and toxic indices of the engine is considered. A new design of the air system is proposed. The system allows us to increase the mass of fresh air charge, to reduce the irregularity of filling of the cylinders and hence to reduce the specific fuel consumption and the fumes of exhaust gases.

Keywords: diesel engine, exhaust gases, environmental protection, toxic  substances, air supply system.

 

SUMMARY

On the new methods of minor repairs on the road carpet

Shishinashvili M.T., Burduladze A.R. and  Kachiuri B. I.

Georgian Technical University

Some new methods of minor repairs of the road carpet are discussed. Basically, the way of patching repair is considered.  There are also given the methods which have been implemented and are widely used in the leading countries: the injection technology – microsurfacing and the use of poured asphalt. The implementation of abovementioned technologies and their wide application in Georgia will provide the preservation of transportation-exploitation indices of the road carpet and will increase the overhaul period, which will give a significant economic effect.

Keywords: road carpet, minor repair technology.

 

SUMMARY

ON THE USE OF SOME STATISTICAL CRITERIA IN DECISION-MAKING

Tsikhelashvili Z.I., Lezhava A.P., Giorgadze G.P., Giorgadze P.Sh. and Verulava G.I.

Georgian Technical University

The problems of using some statistical criteria in decision-making are discussed. Among those criteria are the following: Wald maximum criterion (extreme pessimism criterion ), Savage criterion of maximum risk (extreme optimism criterion) and Hurwitz pessimism-optimism criterion which is recommended to compute for something intermediate between pessimism and optimism. It is recommended to use those criteria for decision-making under the conditions of  stochastic uncertainty, as the choice of the decision based on one or other criterion would be more justified than the volitional choice. Those criteria could be used for making decisions in various fields (chemical technology, sociology, hydroengineering etc.), where different kinds of uncertainty are encountered.

Keywords: decision-making, Wald criterion, Savage criterion, Hurwitz criterion, stochastic uncertainty. 

 

 

 

Summary

On the assessment of ecological risks with consideration for changing social-economical conditions

Lezhava A.P., Giorgadze G.P. and Verulava G.I.

Georgian Technical University

An approach to the assessment of ecological risks with  consideration for changing social-economic and other conditions is proposed. The notions of “dose-effect” and “action-effect” have been classified. The WHO, the American Agency of Environmental Protection and the International Agency of Research  of Cancer (IARC) have not worked out concrete recommendations on the assessment of risks by these notions yet. The proposed approach to the assessment of ecological risks is based on the determination of probability parameters which the state and the stability of natural communities  and natural environment as a whole depend on. On this basis, the formula of determination of the probability of reduction in biological diversity below the criterion level is given.

Keywords: environment protection, ecological risk, hazard measure, changing conditions, human health.

 

 

On the assessment of environmental pollution with industrial  organic pollutants

 

Chankseliani A.B., Kutsiava N.A., Gongadze N.P. and Legashvili I.T.

                                                                                                  

Ministry of Environment Protection and Natural Resources of Georgia

Georgian Technical University

 

 

Abstract.  The inventories of polychlorinated biphenyls and dioxin-furans on the entire territory of Georgia were prepared. The industrial pollutants  and the pollution level were determined.

Keywords: environment protection, organic pollutants, industrial waste, inventory, pollution level, assessment.

 

Summary

The methods of data separation at measuring the humidity and the density of constructional materians

Khurtsilava A.K.

Akaki Tsereteli State University, Kutaisi

The methods of separation of the data on electrophysical characteristics of constructional materials into the components concerning only the humidity and the density are discussed. It is shown that it is more expedient to neutralize the influence of mineralization of porous moisture, which is a noninformative factor, by special measuring procedures, instead of increasing the number of equations in the set and hence the number of measurement channels. At the same time, the informative signal of the sensor must be always determined uniquely by the reactive component of its impedance.

keywords: constructional materials, humidity, density, data separation.

 

summary

optimal control of the dynamics of soil humidity under drip irrigation

Javadzade e. b.

Research Institute of Erosion and Irrigation, Baku, Azerbaijan

The method of drip irrigation is discussed. it is demonstrated that, in comparison with other methods of irrigation, the drip irrigation provides optimal humidifying in  the root systems of plants, prevents the loss of water and forms the conditions for economical use of irrigation water, which promotes the increase in the soil temperature due to permanent circulation of water in the root system and thus in the acceleration of plant growth. It is also justified that, at drip irrigation, drops of water are accumulated in the active soil layer more intensely, which reduces the surface runoff and, as a consequence, the soil wash-out and compaction.

Keywords: drip irrigation, soil humidity, optimal control.

 

Summary

Investigation And Intensification of the process of ULTRAFILTRATION OF biological solutions

rukhadze Sh.Sh., Tavdidishvili d.R., lomaia R.T., pkhakadze t.Y. and beshkenadze T.A.

Akaki Tsereteli State University, Kutaisi

The results of theoretical and experimental investigations on the concentration of biological solutions are presented. The series of obtained results supports the possibility of using the method of ultrafiltration for concentration of gamma globulin. A method of reduction of the concentration  polarization is proposed. Its efficiency is justified theoretically and experimentally. The relationship between the frequency of pressure pulsation and the height of intermembrane channel was determined, which could efficiently be used in designing of flow membrane devices. The  obtained quantitative results were quite satisfactory: under the pressure of 0.6 ± 0.1 MPa and at the temperature of 20°C, the permeability made up 6.5 l×m2/h , the membrane selectivity -  0.99.

Keywords: biological solutions, ultafiltration, intensification.

 

 

EXTRACTION OF ECOLOGICALLY PURE BLUE VITRIOL FROM CHALCOPYRITE ORES BY  A MICROBIOLOGICAL METHOD

 

Kaplanishvili J.Sh.

 

F. Tavadze Institute of Metallurgy and Materials Science

Joint Stock Company MADNEULI

 

 

Abstract. As a result of leaching of chalcopyrite concentrate by a microbiological method, complete separation of copper and iron takes place. Sulfide copper is oxidized in the amount necessary for formation of CuSO4∙5H2O, its excess amount separates out in the elementary form. The amount of pyrite does not change, the pyrite being enriched with gold and silver.

Keywords: chalcopyrite ore, blue vitriol, leaching, microbiological method.

 

Certain Physiological and Bacterial Features of Thiobacillus Ferrooxidans Found in Sulphide Ores and Thermal Sulphur Waters of Georgia

 

Sakhvadze L.I., Kaplanishvili J.Sh., Sakhvadze D.V. and Tavadze G.F.

 

F. Tavadze Institute of Metallurgy and Materials Science

Joint Stock Company MADNEULI

 

Abstract. The morphologic-culture- and physiologic-biological  features of the isolated strains were studied . It was established that they belonged in the species of Thiobacillus ferrooxidans. The species of Thiobacillus ferroxidans. The specific feature of this culture is its high activity both in the oxidation of iron and in the formation of oxalic acid, This is of great importance for reduction of oxidized compounds of various metals.

Keywords:Tiobacillus ferrooxidans, sulfide ores, thermal sufide waters, physiological features, biochemical properties.

 

Summary

The effect of wine maturation in oak wood on the changes in chemical components of wine

Megrelishvili M.M.

Institute of Horticulture, Viticulture and Wine-Making

The wines matured in new and old oak casks were analyzed. The samples were taken from red dry wine made of Saperavi variety grape and the Kakhetian-type wine made of Rkatsiteli variety grape. The casks were made from oak species Quercus iberica. The effect of maturation in oak wood on the changes in spirit percentage, volatile acids, catechols, flavonols and polymeric proanthocyans in matured wines was revealed.

Keywords: mature wines, oak cask, maturation, chemical components.

 

 

 

The Influence of Microfertilizer “Lile” on Vegetable Growth and Development

 

Rekhviashvili L.M.,  Orjonikidze E.K.,  Chikhladze G.M., Lortkipanidze R.O.,

Chachkhiani N.R., Gakhokidze R.A. and Bazerashvili L.G.

 

 

L. Kanchaveli Research Institute of Plant Protection, Tbilisi

Georgian State University of Subtropical Agriculture, Kutaisi

Iv. Javakhishvili Tbilisi State University

Agricultural Biotechnological Center, Tbilisi

 

 

Abstract. The article deals with the issues of treatment of vegetable shoots with environment friendly microfertilizer “Lile”. Such treatment gives high ecological and economic efficiency. Mictofertilizer “Lile” increases the biometric indices of plants, facilitates the activation of on-going living processes in the plant and the plant endurance towards a complex of diseases. The given fertilizer “Lile” may be used as the effective and ecologically safe means of increasing the plant endurance towards a complex of diseases, facilitating the plant growth and development and improving the qualitative-quantitative indices of crops.

Keywords: vegetable culture, microfertilizer, preparation Lile, efficiency.

 

ON the measures of Struggle against Citrus Culture vermins

 

Orjonikidze E.K., Rekhviashvili L.M., Lortkipanidze R.O., Chachkhiani N.R., Gakhokidze R.A.

and Bazerashvili L.G.

 

 L. Kanchaveli Research Institute of Plant Protection, Tbilisi

  Georgian State University of Subtropical Agriculture, Tbilisi

 Iv. Javakhishvili Tbilisi State University

 Agricultural Biotechnological Center, Tbilisi

 

Abstract. The worked-out measures of struggle with vermins of citrus cultures ensure higher biological and economic efficiency. In particular, modern insecticides and biological preparations allow controlling the number of vermins. Up to 92-95% of the vermins are eliminated; the harvest increases by 28-32%, and the profitability reaches 300-350%.

Keywords: citrus cultures, vermins, insecticides, measures of struggle.

 

SUMMARY

Changes in the quality  of hazelnut fat under heat treatment with IR radiation

Silagadze M.A., Berulava I.O. and Iobidze A.V.

Akaki Tsereteli State University, Kutaisi

It was established that irradiation of hazelnut nuclei with IR rays allowed reducing the heat treatment duration by a half as compared to the traditional method of roasting (with hot air at 130-1450C). In the latter case, the time of roasting makes up 30 min, whereas the time of IR heat treatment makes up 15 min (at 1500C). At tasting, the hazelnuts roasted by using the IR radiation at 1500C for 15 min gained the highest estimation (87 points). It was also established that roasting of hazelnut nuclei at different temperature hardly affected the peroxide number of hazelnut fat. The hazelnut nuclei roasted by the proposed method should be stored in cellophane packages for 6 months.

Keywords:  hazelnut, IR radiation, peroxide number, roasting, fat.

 

 

Summary

Technology of production of cornel jelly

Shildelashvili I.I.

J. Gogebashvili Telavi State University

The study on the improvement in the technology of production of cornel jelly was performed. It was established that, from every variety of cornel fruit: Crimean bottle-shaped, Large-fruited late, Lagodekhi early, Small-fruited late and Okroshinda, which are spread in Kakheti zone, it is possible to produce high-quality jelly. The raw materials should be of complete ripeness for making the high-quality jelly from the damp fruit. Keeping the fruit under usual conditions for 1-2 days gives us good results if it is fresh-gathered. Boiling of the raw materials for          20 minutes by adding 20% water should be considered as the optimal conditions for making the juice from the raw materials. For making the jelly, it is better to take the 1:1 proportion of juice and sugar and to boil the mixture for 20 minutes. In the high-quality jelly, the proportion of main components should be presented approximately in this way: sugar - not less than 58%; pectin - not less than 0.8%; acid - not less than 0.95%; water – 39.5%; active acidity – 3.2. So the cornel jelly represents a national, ecologically clean product, which contains vitamins, mineral substances and amino acids. It does not need particular conditions of storage. The described cornel jelly can be widely used in cookery and canning.

Keywords: cornel, jelly, production process, quality.

 

Summary

The study on the possibility Of proDuction of secondary raw materials from used thermoplastic items

Gachechiladze M.V.

Akaki Tsereteli State University, Kutaisi

For protection of the environment from pollution, the possibility of  production of secondary raw materials from used thermoplastic items is discussed. There is offered a two-stage procedure. At the first stage the rheological and technological parameters of the items are studied by using the rheometer modified  by the author (patent is available). At the second stage, the items are recycled with the help of the granulating unit, designed by the author, for production of secondary raw materials.  The design and the production process are briefly described. The prospects of improving the granulator design and its serial production are shown.

Keywords: thermoplastic items, secondary raw materials, recycling, rheometer, granulating unit. 

 

 

SUMMARY

OPTIMAL DESIGNING OF THE  PROCESSES OF MANUFACTURE  OF GARMENTS

Zakaraia M. M.

Akaki Tsereteli State University, Kutaisi

On the basis of research of traditional designing techniques of sewing processes and the development of computer-aided design system, a range of problems which  must be solved first of all for creation of the uniform theoretical and informational bases for computer-aided designing of sewing flow lines has been outlined.. The basic functional units with the prospects of stage-by-stage progress and the system extension were designed.   For the purpose of implementation of design procedures, the algorithm and the program, which were tested on a model of women’s summer dress, were developed. The software package can be applied to the computer-aided design of the process of manufacture of garments of various types and models. The practical significance of the proposed software consists in making simpler the process of designing, reducing the number of designers and the operating space, raising the level of technological solutions, etc.

Keywords: production of garments, computer-aided design, optimization.

 

SUMMARY

THE ORGANIZATION OF INPUT DATA FOR THE COMPUTER-AIDED DESIGN

OF SEWING FLOW LINES

Zakaraia M. M.

Akaki Tsereteli State University, Kutaisi

The database developed for a concrete sphere - computer-aided design of sewing flow lines suits the basic requirements to databases such as compactness, self-descriptiveness, perfection, visualization, unification, profitability, simplicity of application and sweeping access to the data. For the developed arrays, the structure of logical links was established in accordance with the sequence of formation of inquiries during the execution of design procedures. Some data groups can be applied to the computer-aided design of the processes of manufacture of garments of any kind and model.

Keywords: manufacture of garments, computer-aided design, sewing flow line, organization of input data.

 

 

Summary

The Conditions of wet processing of fiber material on the Twistless spinning machinE

Moseshvili T.V.,  Gamkrelidze E.A. and Goginovi K.G.

Akaki Tsereteli State University, Kutaisi

The degree and the speed of activation of the binding substance depends on the conditions of wetting and on the compaction of the fiber  material. The thickness of the  liquid film on the  surface of fibers  is considerably less than the sizes of drops of the liquid generated by sprayers, which testifies to the necessity in compression of fibrous product for the purpose of redistribution of the liquid in the volume of their pores. The optimum pressure of air in the aerodynamic twisting device for formation of high-grade conditions of wetting and activation of PVC fiber should not exceed 0.004ÌPa.

Keywords: fiber, wet processing, twistless spinning machine.

 

 

Summary

The Influence of Twistless  Structure of the Yarn on its mechanical properties

Moseshvili T.V., Gamkrelidze E.A. and Maglaperidze Z.I.

Akaki Tsereteli State University, Kutaisi 

The twistless  yarn is formed at pasting of separate fibers as a result of interaction between the binding substance and the fiber. As the research has shown, the most part of fiber belongs  to class 0, where the average factor of extent of fiber is equal to 1. The fibers are extended in parallel to the axis of the yarn along their entire length and are basically located close to the  product axis. The peripheral fiber belong  to other classes, they are located along screw lines with a big step. The durability of twistless   yarn is much higher than the durability of the yarn produced by ring spinning.

Keywords: twistless yarn, fiber, structure, mechanical properties.

 

Summary

Mathematical model of interaction of solar radiation with the structure of textile fabric

Gintibidze N.G.,  Mardaleishvili Z.Z.,  Sopromadze I.G.,  Cheishvili M.O.  and Tkhelidze N.N.

Akaki Tsereteli State University, Kutaisi

The issues of the influence of solar radiation on the human organism are considered. A mathematical model of interaction of solar radiation with the structure of textile fabric is given.
Keywords: solar radiation, textile fabric, interaction, mathematical model. 

 

 

summary

Modeling of the friction gear transporting fiber Fibroin 3

Gintibidze N.G. and Zakaraia M.M.

Akaki Tsereteli State University, Kutaisi

The purpose of designing of the device is mechanization and automation of the process of formation of the fiber produced by chemical processing of waste products. A characteristic feature of the device is the arrangement of its units in the closed space, the form and the dimensions of which are limited. Thus it is necessary to note the complexity of technological process which consists of a plenty of operations that are carried out in the chemical environment. In conformity with the modular principle of construction of machines, on the basis of the initial technological process, an original friction gear for transporting the fiber has been designed.

Keywords: fiber, transportation, friction gear, design.

 

 

Summary

Dyeing of woolen fabrics with natural bioprotective dyes

Achvlediani M.E.,   Gintibidze N.G.  and Todua N. Sh.

Akaki Tsereteli State University, Kutaisi

The basic characteristics of safety of textiles have been investigated and compared with the authorized norms. The ðÍ value of the water extract from the fabric should be equal to 4.0 to 7.5. This is due to the fact that our skin (consisting basically of collagen fiber) has typically ðÍ4.5 to pH5.5 (isoelectric point).  The stability of coloring to sweat and saliva (for children) is also very important. This parameter of stability is connected with safety, as the dye exposed to the influence of sweat or saliva could get into the organism.

Keywords: wool, natural dyes, dyeing.

 

Summary

on the problem of children’S Shoes associated with foot pathology

Grdzelidze M.G. and Katamadze A.G.

Akaki Tsereteli State University, Kutaisi

The pathology of children’s feet could be the first symptom of serious problems with health. Reflexogenic zones and points that innervate almost all the organs of human body are located on feet. The flat foot is a kind of foot deformation with flattening of foot vaults. There are recognized lengthwise and cross kinds of flattening. Their combination is also possible. The results of our studies enabled us to work out the recommendations on prophylaxis and preventing the development of flat foot in children by choosing the appropriate shoes and orthopedic appliances.

Keywords: shoes for children, flat foot, orthopedic appliances, prophylaxis.

 

SummAry

On the specific  requirements  imposed  upon  footwear  with  consideration  for  foot  pathology

Grdzelidze m.g.,  katamadze  a.g.  and    shalamberidze  m.m. 

akaki Tsereteli State University,  Kutaisi

The  issues  of  taking  into  consideration  the   specific   features   of  foot  structure   in  footwear  production  have  not   been   adequately  studied.  Especially  this  concerns  various  foot pathologies.  More precise  definition of their  severity  and frequency of  occurrence is  essential  for  their  prophylaxis  and  elimination. The  incorporation of correcting  elements into   working  and  daily  footwear is a necessary  and  efficient  measure. Based  on considerable  experimental materials, the specific  requirements  imposed upon  footwear with consideration for foot  pathology  are  discussed.

Keywords: footwear, foot  pathology,  specific  requirements.