DIFFRACTION OF the  H-POLARIZED WAVE AT THE STRIP

 

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

 

Georgian Technical University

 

Abstract. The rigorous solution of the problem of diffraction of the plane H-polarized electromagnetic wave at ideally conducting, infinitely long thin strip is presented. There is given in the explicit (analytical) form the dependence of the surface current of the strip on the transverse coordinate and parameter , where being the wavelength;  the half-width of the strip. The characteristic of re-radiation of the strip is also given in the explicit form.

Keywords: diffraction, H-polarized wave, ideally conducting strip.

 

 

DIFFRACTION OF THE PLANE WAVE AT IDEALLY CONDUCTING THIN STRIP

 

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

 

Georgian Technical University

 

Abstract: By the method of dual integral equation, the rigorous solution to the problem of diffraction of the plane E-polarized electromagnetic wave at the strip in case of normal incidence was obtained. The explicit (analytical) expressions for distribution of the density of the surface current at the strip as well, as the characteristics of reradiation depending on the parameter of the strip  are given,  being the wavelength and the width of the strip, respectively. There were found the values of  , at which the strip does not reradiate (scatter) in side directions,  being the roots of transcendental equation . The numerical  results in the form of the pattern of the strip are given.

Keywords: ideally conducting strip, plane electromagnetic wave, diffraction, E-polarization, rigorous solution.

 

 

SUMMARY

Radiation of the plane transmitter with a single dipole

Chuntishvili I.I.

Georgian Technical University

The electrodinamic problem of radiation of the plane transmitter with a single dipole has been solved by a rigorous approach. The explict expression for current density distribution on the dipole surface was obtained. The formula for the design of the transmitter pattern was derived.

Keywords: transmitter, radiation, dipole, pattern.

 

SUMMARY

LAGRANGIAN CHAOS IN ELECTRODYNAMICAL VORTEX STRUCTURES

Kharshiladze O.A.

Iv. Javakhishvili Tbilisi State University

For investigation of dynamic ionospheric vortex structures, the method of Poincare sections is used. The two-dimensional, dynamically consistent model, evincing Lagrangian turbulence, is considered. The calculation results of trajectory and coordinates show that the particles move chaotically over the whole region, except the regular “islands”. The stationary vortex structure destruction at small harmonical disturbance of the stationary flow is demonstrated..

Keywords: Lagrangian chaos, vortex structure, ionosphere.

 

FLOW  BETWEEN  TWO COAXIAL TUBES  NEAR  THE  INLET

 

Tsutskiridze V.N.

 

Georgian Technical University

 

Abstract: Laminar inlet flow (flow in the inlet length) of incompressible viscous fluid                                            bet­ween two co-axial cylinders was studied on the basis of linearized Navier-Stokes equations. It was assumed that the velocity of the fluid is uniform at the inlet cross-section. The formulae for the longitudinal component of velocity and the pressure gradient in the inlet length were obtained.

Keywords: сoaxial cylinders, Cylindrical polar coordinates, flow pressure gradient, longitudinal                     component of velocity.

 

SUMMARY

NON-STEADY FLOW OF CONDUCTING LIQUID with consideration FOR the inhomogeneous OUTER MAGNETIC FIELD

Tsutskiridze V.N.

Georgian Technical University

Exact solutions of non-stationary problems were  obtained for fully developed flow of  conducting liquid in the  direction  of the x axis  through  inhomogeneous outer magnetic field      for half-space and a flat tube under the condition of equality of magnetic and kinetic viscosity. In the case of  half-space, the solution is expressed in terms of the integral of probability.

Keywords: conducting liquid, non-steady flow, inhomogeneous magnetic field, half-space, flat tube, integral of probability.

 

SUMMARY

Nonaxisymmetric strain of the open spherical shell

Gegelashvili T.A. and Bekirishvili M.L.

Georgian Technical University

A boundary problem on nonaxisymmetric strain of the open spherical shell being under the effect of internal pressure was formulated. The solution to the problem was constructed in the form of series of trigonometrical functions and the Legendre polynomial. The factors of these expansions satisfy  the infinite set of algebraic equations which can be solved by the method of reduction.

Keywords: spherical shell, nonaxisymmetric strain, boundary problem.

 

SUMMARY

On the gravity wave velocity

Garibashvili D.I. and Dakelyan A.G.

Department of Informatics of the Georgian Academy of Sciences

Based on the assumption about high-density packaging of particles in the black hole, the dependence of the radius of the black hole on its mass was determined. It was found that the gravity wave velocity was by several orders of magnitude greater that the velocity of light.

Keywords: gravity waves, wave velocity, black hole.

 

 

ONE METHOD OF CONSTRUCTION OF MUTUALLY INVERSE MATRICES

OVER THE GALOIS FIELD AND A NEW CRYPTOSYSTEM

 

Megrelishvili R.P., Khutsishvili G.K. and Chelidze M.A.

 

Iv. Javakhishvili Tbilisi  State University

 

Abstract: In this work a new method of constructional generation of mutually inverse matrices is proposed. It is shown that there is a possibility of constructing nxn matrices over the Galois field GF(q) for any integer n>0. Secret-key cryptosystems and a combined cryptosystem are also the subject of study in this work.

Keywords: cryptosystem, mutually inverse matrices, secret-key, encoding-decoding, chosen-text attack.

Investigation OF THE depth and THE character of transformations during mechanical polishing of ground surface of Fe-Cr-Al-La alloy

 

Kutelia E.R., Tsurtsumia O.O., Adanir H., Bakhtiyarov S.I., Beradze D.L. and Eristavi B.G.

 

Republic an Center for Structure Researches, Georgian Technical University

New Mexico Institute of Mining and Technology, the USA

 

Abstract. By the methods of Auger-electron spectrometry (AES), scanning electron microscopy (SEM), fast electron diffraction (FED) and wavelength dispersive spectrometry (WDS), there were carried out complex investigations on the structure and elemental distribution in the Beilby layer formed during mechanical polishing of ground surface of Fe-44%Cr-4%Al-0.3%La alloy. It was established that the Beilby layer formed during mechanical polishing of ground surface of the investigated alloy consists of two sub-zones with uniform thicknesses combined with each other organically. The first (outer) zone with thickness of ~250Å is a truly amorphous layer saturated with oxygen and carbon atoms; and the second, underlying (inner) zone of ~350Å thickness, which also has high concentration of oxygen and carbon, is of a nanocrystallite (~20Å) structure (in roentgen-amorphous state). The ratio between the thicknesses of the given zones, which compose the Beilby layer, to a certain extent depends on the polishing duration and the condition of the initial surface antecedent to mechanical polishing. On the basis of observable peculiarities of the character of changes in the thickness of revealed zones depending on the polishing duration and the initial surface condition before mechanical polishing, there have been of developed notions of the hierarchical sequence of stages of formation of the Beilby layer (and layers under it) as a product of the combination of processes of visco-plastic mass-transfer and growth of crystal structure defects, which are accompanied by plastic deformations. The stabile existence at room temperature of the superficial layers with truly amorphous and “roentgen-amorphous” states, which are so nonequilibrium against the underlying crystalline structure, is explained by the dissolution of those layers with carbon and oxygen atoms and their interaction with the basic atoms which compose the investigated alloy.

Keywords: surface, Fe-Cr-Al-La alloy, mechanical polishing, Beilby layer, amorphism.

 

Summary

Quenching of triplet states with phenols

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

Georgian Technical University

There are given the values of the Kinetic isotopic effect at quenching of triplet states of quinines with 3A phenols which justify the mechanism of quenching proposed in this and previous works. According to this mechanism, the kinetics of quenching and the quantum yield of radicals are determined by three elementary stages: the process of formation of the complex with a hydrogen bond, the transfer of hydrogen atom and the photolytic equilibrium in the complex formed. The isotopic effect for the rate constant of quenching of triplet states of quinines with phenols increases, as increases the acidity of phenol, and then decreases again.

Keywords: triplet states, quinines, phenols, quenching.

 

 

Summary

The peculiarities of annealing of defects of the Ec-0.17 eV level in  Irradiated n-Si Crystals

Pagava T.A., Kharashvili O.G., Maisuradze N.I., Khasia N.I. and Kanchaveli D.E.

Georgian Technical University

In the n-Si crystals irradiated with protons having the energy of 25MeV, the radiation-induced defects of the Ec-0.17 eV level were annealed in two stages: Tan=2000C and 3000C. It is demonstrated that, unlike the divacancy (V2), Tan of the defects annealed at 2000C does not depend on the concentration of disordered regions (DR). This points to the fact that these defects are of the internode CiCs - type (internode carbon-carbon in a node). At Tan=3000C, the A-centers are annealed. The negative annealing of A-centers and V2 is connected with dissociation of DR.

Keywords: n-Si crystals, protonic irradiation, radiation-induced defects, isochronous annealing.

 

ON AN ANALYTICAL-GEOMETRIC METHOD OF SOLUTION OF THE SET OF NON-LINEAR EQUATIONS

 

Onal H.

 

International Black Sea University, Tbilisi

 

Abstract: An analytical-geometric approach to the non-linear equation system is suggested. The method connected with the necessity of determination of new intermediate centers of rotation of multi-joint spatial mechanisms is based on orthogonal transformations of Euclidian space.

Keywords: nonlinear equations, analytical geometric method, orthogonal matrix, Euler’s angles, system of basis vectors, inverse transformations, inverse kinematic problem.

 

ON AN ANALYTICAL-GEOMETRIC METHOD OF SOLUTION OF THE SET OF NON-LINEAR EQUATIONS

 

Onal H.

 

International Black Sea University, Tbilisi

 

Abstract: An analytical-geometric approach to the non-linear equation system is suggested. The method connected with the necessity of determination of new intermediate centers of rotation of multi-joint spatial mechanisms is based on orthogonal transformations of Euclidian space.

Keywords: nonlinear equations, analytical geometric method, orthogonal matrix, Euler’s angles, system of basis vectors, inverse transformations, inverse kinematic problem.

 

, simplex design, instrument accuSUMMARY

The investigation of properties of the first-order three-component simplex-grating design at accounting for errors of measuring instrumentation

Beraia N.O., Zedginidze I.G. and Modebadze T.Z.

Georgian Technical University

The properties of D-, A- and E-optimality of first-order simplex-grating Sheffe designs were studied in the process of their application to determination of the components of measuring instruments having specific errors. The simulation of different errors of measuring instruments  was performed by overlapping of random numbers distributed by the normal method on the coordinates of the linear design. It was established the properties of D-, A- and E-optimality deteriorate to a certain extent at using real measuring instruments.

Keywords: experiment designracy.

 

 

SUMMARY

Wave process in the shell-bar structure under axial loading

Gegelashvili T.A. and Verulashvili L.G.

Georgian Technical University

This work is devoted to development of the method of numerical modeling of he problem of determination of dynamic reaction of the axisymmetrically loaded mechanical system consisting of two cylindrical shells at the joint of which a thin rigid body of weight M2 is placed. To the ends of the combined shell, undeformable weights M1 and M2 are  fastened, and they are connected, along the system axis, to weight M2 with springy bars having cross-sections S1 and S2. The mathematical model of the process with account for axial symmetry is a linear set of dynamic equations of the theory of Timoshenko shells, which considers for shearing strain and rotary inertia of the lateral element.

Keywords: shell, bar, wave, structure, axial load.

 

 

SUMMARY

Stressed-strained state of the bar dome structure

Jincharadze I.G.

Georgian Technical University

The theoretical statements of the method of design of bar domes and the algorithm for computer-aided design of such domes are presented. The method of finite elements has been used. The values of transition coefficients are given in the tables. Using those tables, after processing the testing results, a vivid pattern of the model deformation was obtained.

Keywords: dome, bar, stressed-strained state, computer-aided design.

 

SUMMARY

Deign of the rigidity of three-layer panels

Kacharava I.T.

Georgian Technical University

There were synthesized algorithms and derived formulae which make possible the investigation of the effect of dimensions and arrangement of holes on the carrying capacity of three-layer panels and the determination of the coefficient of reduction of critical load with account for the hole. The suggested procedure allows considering for different conditions of bearing-up along the outline.

There were also derived the formulae for determination of the critical load on the panel at various combinations of boundary conditions: at two restrained and two hinge-supported edges; at two springy-supported and two hinged edges; at four restrained edges.

Keywords: three-layer panel, rigidity, design.

 

 

 

SUMMARY

On the generality of the notion of duality of evolution and revolution

Khvedelidze M.A.

Institute of Cybernetics

Georgian Engineering Academy

International Informatization Academy

The author supposes that the duality of evolution and revolution could be realized with consideration of existing certain similarity in the processes of self-organization of various systems from physical-chemical to biological and social ones and, at the same time, of their certain difference from their initial level. But the history of all revolitions has always been in the transien­t period, in the state of inevitable chaos. The  possibility of transition to a new stable state requires a great amount of energy. In this case, the general rule of duality of structural organization of matter acts like in the case of dual polar-pair states of the matter. The author considers that the existence of inverse transformation from the state of order to the state of chaos today can be justified by the example of the social system. Later, after studying thoroughly the physical vacuum, it would be also possible to demonstrate the inverse transformation of diffused energy and information into the concentrated state according to the absolute principle of conservation of energoinformation. It is stated that, without formation of at least a single type of dual regular polar-pair state of matter, the Earth itself could not have emerged.

Keywords: self-organization, duality, energoinformation, evolution, revolution.

 

SUMMARy

Academician mate mirianashvili’s works on quantum mechAnics

Lekvinadze I.Sh.

A. Tsereteli Kutaisi State University

Three works on quantum mechanics by Academician Mate Mirianashvili are discussed. These works are: On the Variational Problem of Quantum Mechanics, The S-Matrix and Narrow Structure Formula and On the Relativistic Magnetic Moment of Charged Particles. It is demonstrated that, in these works, the author explained the issues of equivalence of various mathematical methods of studying the corresponding phenomena and clarified the situation.

Keywords; quantum mechanics, Mirianashvili’s works.

 

Summary

On the issue of modeling of elements and circuits in nanoelectronics

Dadunashvili S.A. and Dzagania N.S.

Georgian Technical University

The principles of modeling of elements and circuits in nanoelectronics are considered. The evolution of electronic elements at transition to the  nanorange is shown. A new circuit technique of electronic devices is established.

nanoelement, single-electron transistor, quantum dot, simulation, neural network.

 

 

 

 

 

 

 

of Requirement of Overcoming the Digital Divide on the Way of  Building the Information Society

 

Zumburidze O.G. and Lezhava G.B.

 

Georgian Technical University

 

Abstract. The article discusses the opportunities of application of the infotelecommunication overcoming the information disparity, the so-called digital divide in comparison with the developed countries. The level of penetration of various ICT-based services in  these countries  with indication of ICT densities (teledensity, computer density etc.) is shown. The economic and information criteria of the Global Information Society and Jeep’s charts are also considered

Keywords: information disparity, digital divide (gap), ICT-based services, penetration, teledensity, computer density, Jeep’s chart, Global Information Society.

SUMMARY

information security

Kachlishvili T.T.

Georgian Technical University

In recent years the demand for the services in the sphere of information security (IS) in Georgia has grown significantly. In the article, the approaches of such companies as Cisco Systems, Enterasys, Nortel and others to resolution of IS problems are discussed. There are considered various versions necessary for securing the network, preventing the unauthorized access form internal and external intruders, restricting the spread of viruses in the network, isolating the infected servers and network devices etc.

Keywords: information network security, complex protection, prevention of unauthorized accesss, security against spam, security of ports.

 

SUMMARY

DATA security in computer networks

Kachlishvili T.T.

Georgian Technical University

There are discussed the problems related to data protection and to one of powerful programs providing the protection against viruses in LAN by Intel LANDesk Virus Protect, which is based on a network server. Antivirus programs struggle against viruses. There are discussed the operation of the network and the resolution of problems of configuration, restriction of access and other safety measures providing continuous performance of computer netwworks.

Keywords: data security, protection against computer viruses, restriction of access, unauthorized access.

 

SUMMARY

On The systems of synchronization in digital communication networks

Naskidashvili D.P.

Georgian Technical University

The system of synchronization for digital communication networks is considered. An example of commutation of digital signals in communication networks is given.

Keywords: digital network, communication network, synchronization

 

SUMMARY

On the issue of determination of the availability function of some types of equipment

Jojua Z.S. Arabuli N.V. and Jojua N.M.

Georgian Technical University

There was studied the reliability of machines subject to two kinds of  failures detected at the moment of their occurrence by perfect continuous control. The two kinds of failures were the following: wear failures distributed by the random law and random failures distributed by some complex combinations of exponential distributions, e.g. the procurement combination of exponential distributions. In this case, only two states of the equipment were considered: “operates” and “does not operate”. As a failure was taken an event that caused complete cessation of output of products. After the failure, the equipment was returned to service, and, after recovery, there did not occur such failures. The function of availability for service was also determined.

Keywords: equipment, reliability, failure, availability for service, repair.

0

ANALYSIS OF BIO-ENERGY COMPLEX MANAGEMENT

 

Tolomashvili A. I., Tkemaladze G.Sh., Khidesheli T. M.,

Gelashvili I.V. and Tolomashvili I.A.

 

National Chamber for Environment, Quality, Technical Safety and Labor Processes Management

Georgian State Agricultural University

 

 

Abstract. There were developed variational series of the bio-energy complex, which differs from the semi-open premises for the cattle in the farm economies, considered in the literature, as the farm-elevator allows for full mechanization of production processes in cattle-breeding, control of basic parameters and mechanisms, provision of comfortable conditions, facilitation of maintenance, weight growth and healthy environment. It is proven that, in many cases, waste treatment ensures incomes, which are even higher than revenues provided by sales of the main products. There are shown the possibilities of production of the biogas and fertilizers from the wastes, and there is proposed the calculation of the economic effect.

Keywords: bio-energy complex, management, analysis

 

 

 

 THE METHOD FOR NEUTRALIZATION OF WASTE WATERS

 

Tolomashvili A.T., Tkemaladze G. Sh. , Arevadze G.G., Gelashvili I.V.,

Tolomashvili I. A. and Kaldani G. N.

 

National Chamber for Environment, Quality, Technical Safety and Labor Processes Management

Georgian State Agricultural University

 

 

Abstract. The work deals with the original method of neutralization of inorganic wastes and waste waters, which prevents their spreading into the environment, in particular, in the arable lands and hydrographic networks.  There is shown that, by adding various components to the wastes and waste waters it is possible to produce new construction materials with desired properties, which, besides ensuring the healthy environment, provides significant additional profil.

Keywords: neutralization, waste waters, inorganic wastes.

 

SUMMARY

On the issue of sea water concentration by the method of electrodialysis

Chkheidze N.V., Enukidze N.E. and Kurtskhalia Ts.S.

Research Center “Membrane”

The availability of sea water concentration by the method of electrodialysis with the aim of its further processing is shown. The experimental work on models at different dialyzate flow rates was performed. The possibility of continuous production of 23-25% concentrations of sea water was determined. The power input and the specific parameters of the process of electrodialysis were calculated.

Keywords: sea water concentration, electrdialysis, power input, specific parameters.

 

 

SUMMARY

ON Functional tasks of ecological monitoring

Mchedlidze M.G. and Lezhava A.P.

Georgian Technical University

In the framework of general system approach to the organization of ecological monitoring, there are discussed functional tasks the realization of which is essential for security of ecological safety. The block diagram of organization of ecological monitoring, which presents the information about structural links among the units is presented.

Keywords: ecological monitoring, functional tasks, block diagram.

SUNMMARY

On ecological consequences of emergencies and disasters at enterprises with chemical technology

Lezhava A.P.

Georgian Technical University

Emphasis is placed upon ecological consequences of emergencies and disasters at enterprises with chemical technology, spread of harmful chemicals in the environment and their migration in environment-forming components with the changes caused by chemical conversions proceeding in the biomass of plants and living organisms. There is proposed a diagram of the model of the environment represented in the form of a number of basins (components), which can be various media, biospheric layers and other. By using differential equations, there is explained the dynamics of transfer of substances from one basin (component of the environment) to other and the exchange process among these basins.

Keywords: chemical enterprise, environment protection, emergency, disaster, ecological consequences

 

 

SUMMARY

On the statistical control of water quality in the process of water treatment

Gujabidze M.R.

Georgian Technical University

There is considered the procedure of application of statistical theory of water quality control in the process of water treatment in water supply systems by constructing and using Shewhart charts in accordance with British Standards. The block diagrams descriptive of the sources of variation of treated water quality and the functions of water quality control are presented. The proposed procedure can be used for water quality control in the steady process of water treatment.

Keywords: water quality, water treatment, statistical control, control charts, Shewhart charts.

 

 

Summary

On the prediction of anthropogenic effects oN the environment

Dumbadze Z.A.

Georgian Technical University

The block diagram of the system of prediction of anthropogenic effects on the environment is presented. The available up-to-date information about a phenomenon, a process or an object to be predicted enters the prediction system via its input, and the data on the expected parameters (i.e. the prediction) of the phenomenon, the process or the object are output. As a future situation related to the anthropogenic effect depends on many  factors of stochastic origin and is characterized by uncertainty, the method of maximum likelihood has appeared to be suitable for this case. The abovementioned method is based on the probabilistic approach. The analysis and the estimation of predicted parameters of anthropogenic factors are often multiple-factor and are associated with elimination of uncertainty. This requires the application of the system approach and the corresponding body of mathematics.

Keywords: prediction, anthropogenic effect, environment, block diagram, method of maximum likelihood.

 

 

 

 

SUMMARY

On the Problem of quantitative estimation of semantic information

Lezhava G.G., Kamkamidze I.Sh., Berikashvili Z.I., Mkrtchyan E.M. and Vardosanidze A.K.

Institute of Cybernetics

As informational technologies progress, the sphere of application of the term “information” expands. At the same time, the meaning they put in this term becomes somewhat hazy. For further progress in the field of artificial intelligence systems, it is essential to develop a semantic theory of information and, thus, to make clear such a basic notation as information. In the present work is made an attempt of development of a new approach to the solution of the problem: information is considered as a process of cognitive interaction; two forms of informational interaction are distinguished; their quantitative estimations are given.

Keywords: information, semantic theory, quantitative estimation cognitive interaction.

 

 

 

 

Summary

On the organization of stochastic optoelectronic computational structures for solution of complex three-dimensional problems OF mathematical physics

Eremeishvili N.I., Kurdadze M.A. and Elizbarashvili M.R.

Georgian Technical University

The methods of construction and the principles of operation of special optoelectronic computational  structures for solution of differential equations with three independent variables x,y and z are considered. The structure of the computational device with large-capacity holographic memory is presented. Based on the matrix method of recording, storage and reading of large numerical data arrays, there is proposed a probabilistic approach to the solution of complex three-dimensional boundary problems using stochastic tests. The efficiency of the application of the proposed device to the solution of three-dimensional problems of high complexity of modern mathematical physics is demonstrated.

Keywords: optoelectronic computational structure, stochastic test, three-dimensional problem, mathematical

 

 

Summary

On some approaches TO the economic Analysis of reliability of optoelectronic devices

Eremeishvili N.I., Kurdadze M.A. and Elizbarashvili M.R.

Georgian Technical University

Some aspects of the economic analysis of highly reliable optoelectronic devices are discussed. There is noted the economic expediency of designing and using the optoelectronic devices which overcome their electronic analogs from the standpoint of high reliability. The economic indices for estimation of the efficiency of highly reliable optoelectronic devices have been  analyzed.

Keywords: optoelectronic devices, reliability, efficiency, economic analysis.

 

 

SUMMARY

open models of multilink data transmission path and deterministic pipeline models of virtual multilink connection

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

Georgian Technical University

There are described open models of the multilink data transmission path, which allow analyzing the effect of the communication channel quality and the capacity of buffer storages of transit switching centers on operational indices of the network level protocol. There are also considered deterministic pipeline models of the multilink path, which enable one to study the process of transmission of multipacket flow via nonuniform virtual multilink connections  at the transportation level of network management. Based on the models of the abovementioned process, which are characterized by consideration for the pipeline effect, it is possible to solve the problem of optimal fragmentation of users’ messages into data packets.

Keywords: open models, data transmission, packet switching, deterministic models, pipeline, multilink connection.

 

 

SUMMARY

Simulation of the processes of updating Of distributed databases by using Petri system nets

Surguladze G.G., Gulua D.I., Petriashvili L.N. and Vitanage D.

Georgian Technical University

Humboldt Berlin University, Germany

Sri Lanka University, Sri Lanka

The object-oriented simulation of parallel processes proceeding in control systems of distributed databases and the solution of the problem of analysis by using the Petri system nets are considered. For providing the synchronization of these processes,  there is proposed a special distributed algorithm for updating of databases with maintenance of their logic integrity. For the experiment, the graphical-analytical tools of the high-level Petri net were used.

Keywords: database, updating, simulation,  Petri net.

 

 

 

 

Summary

The Problem of optimality of selection of design works

Burkova I.V. and Burjanadze V.O.

V.A. Trapeznikov Institute of Management Problems, RAS, Moscow, Russia

Georgian Techncal University

There is discussed the problem of selection of design works which will produce the maximum profit. The solution is offered by the example of the decision with the help of dichotomizing representation of limitations.

Keywords: design works, optimality problem, selection dichotomizing representation

 

SUMMARY

Information support of determination of the electromagnetic conditions in radio coverage zones

Zurabishvili V.I., Svanidze T.S., Adamia M.I., Areshidze S.M. and Bokuchava M.A.

Georgian Technical University

There is proposed a computer program (database) for information support of the problems of determination of electromagnetic conditions in radio coverage zones, in particular, for prediction of electromagnetic compatibility of radiotechnical facilities and sanitary safety in those zones.

Keywords: radio coverage zone, electromagnetic compatibility, information support.

 

 

SUMMARY

A mathematical model of electricity production

Macharashvili G.G.

Georgian Technical University

The analysis conducted has shown that, from a lot of factors affecting the electricity production, those ones should be chosen which have the largest effect on the determination of the demand for power. Such factors are the following: the rates of electric power, the number of population and the income of the population. The functional dependences of the production capacity on individual factors were determined. The electricity production capacity was determined as the algebraic sum of those dependences.

Keywords: electricity production, demand, production control, mathematical model, weght factors.

 

 

SUMMARY

On the issue of “noncentral χ 2” distribution

Tomaradze O.K., Murjikneli G.G. and Modebadze Yu.Sh.

Georgian Technical University

There were obtained the expressions for “noncentral χ2” distribution of characteristic, probability density, distribution and moments functions.

Keywords: noncentral χ 2, function, moments, distribution.

 

Summary

THE RESULTS OF THE MEDICAL-BIOLOGICAL RESEARCH OF THE PATIENTS IN THE CONDITIONS OF THEIR PROTECTION FROM THE INFLUENCE OF GEOMAGNETIC STORMS

Invia N.S., Tvildiani L.D. and Khomeriki O.K.

Georgian Technical University

Tbilisi State Medical University

There atre presented  the results of medical examination of patients suffering from heart diseases, in the conditions of their stay in specially equipped rooms (wards) during the geomagnetic storms. These wards permanently maintain all parameters of the environment (temperature, ionization and air pressure, humidity, illumination etc.), but at the same time the disturbed variations of geomagnetic field are compensated. The statistics which characterize the state of patients showed high efficiency of protection from adverse effects of geomagnetic storms.

Keywords: geomagnetic storms, protection, medical-biological ibvestigation.

 

 

 

 

 

 

Main Prospects for Using Gas- and Gas-steam Turbine Plants in Power Industry of Georgia

 

Chitashvili G.P., Arabidze G.O., Jishkariani T.S. and Khetaguri A.G.

 

Georgian Technical University

 

Abstract. Basic tendencies for development of gas-turbine (GTP) and gas-steam (GSTP) plants and current achievements in this field worldwide are briefly overviewed. It is mentioned that the expansion of gas-turbine (GTP) and gas steams (GSTP) plants has been supported by market changes in power industry – the emergence of competition and the liberalization of energy markets. These plants are characterized by good energy and ecological features, low specific cost and short term for construction. The GTPS and GST should be widely introduced in Georgia. They can be used for cogeneration power plants (block thermal power plants), reconstruction of existing thermal power plants and building of new plants, as centrifugal expanders on main pipelines, for construction of air-accumulation  gas-turbine power plants etc.

The construction and operation of binary exhaust heat boiler gas-steam thermal power plants are most effective.  Such power plants are spread worldwide. The coefficient of efficiency is 55 – 60 %. The introduction of binary gas-steam turbine plants with inner cycle coal gasification is rather promising in Georgia. In fact, such a plant becomes chemical-power enterprise. Despite lower energy efficiency the gas-steam plants of semi-dependent schedule can be used for upgrade and reconstruction of outdated condensing units existing in Georgia. The introduction of modern gas-turbine and gas-steam plants on a large scale has no alternative in power industry of Georgia.

Keywords: power industry, gas-turbine plant, gas-steam plant, prospects of development, efficiency.

 

The principle of calculation of economic efficiency of vehicles

Kharitonashvili V.A., Chlachidze Z.I. and Nikolashvili R.A.

Georgian Technical University

There is considered the possibility of calculation of economic efficiency of vehicles with account for average speed between stops, indices of encouragement of drivers, fuel consumption, depreciation and maintenance intervals.

Keywords: vehicle, average speed between stops, economic efficiency, operational expenses.

 

 

SUMMARY

On the road safety of vehicles with right-hand streering wheels

Kharitonashvili V.A., Gogolashvili L.N. and  Chlachidze Z.I.

Agency of Automobile Transport of  Georgia

The problem of road safety  caused by vehicles with right-hand steering wheels is discussed. There is justified the necessity in banning the operation of such vehicles in the countries where right driving of vehicles is adopted.

Keywords: road safety, vehicle, right-hand steering wheel, right driving.

 

SUMMARY

Theoretical and graphical representation of the surface of propeller arm of the electric windmill

Kisishvili L.T.

Georgian Technical University

The surface of propeller arm of the electric windmill is considered. There are discussed theoretical and graphical methods of representation of surfaces, in particular of the surface of right cylindroid. Such a shape of the propeller arm provides the maximum rotary force, and its exact graphical representation promotes choosing the method of mechanical treatment of the surface of the propeller arm.

Keywords: electric windmill, propeller arm, right cylindroid, surface.

 

 

 

 

 

SUMMARY

The System for accounting the electric power consumed by subscribers

Vepkhvadze A.N., Khurodze T.A., Kvirkvelia B.V., Muradyan Z.G. and Chumburidze T.Z.

Iv. Javakhishvili Tbilisi State University

Georgian Technical University

Introduction of the automated system of the account of the amount of electric power consumed by sub­scribers is beneficial to the power supply system. It enables the system to work in an economical regime, since, as is known, if a con­sumer knows which time interval is favorable for him for the power consumption, he maximizes power consumption in this period and it turns out that the consumer participates in system management and promotes involuntarily its stability. The proposed system allows the introduction of the system of the differenti­­ated tariffs, the exclusion of unaccounted charges of the elec­tric power, finding the losses (theft) of energy, and providing the switching-off of subscribers on debts.

Keywords: power consumption, automated management system.

 

SUMMARY

The algorithm of network decomposition in tree-type structures

Gogichaishvili G.G., Meparishvili B.D. and Janelidze G.N.

Georgian Technical University

Among a lot of problems of management of industrial projects with network structures (water, gas and power supply systems), there is a problem of optimal distribution of material flows. Based on the specific character of the project, its structure should exclude any cycles and loops, i.e. its system must be represented in the form of independent tree-type structures, the roots of which are the outflows. These trees must complement each other so that no branch should fall out of the field of consideration. Fluctuations of local loads or input flows from the sources, as well as emergency situations, establish the conditions of dynamic regeneration of tree structures and, thus, of redistribution of the flows in the branches of those trees, which complicates significantly  the management tasks. There is proposed an algorithm of network decomposition in tree-type structures. This algorithm is recursive, and, to a certain extent, it is related to the algorithm of finding the spanning set tree, though differing from it significantly.

Keywords: algorithm, network  decomposition, tree-type structure, management of industrial project.

 

Quantitative characteristics of Data Packets Transmission via Powerlines

 

Mirtskhulava L.G., Gvaramia E.G. and Mirtskhulava E.G.

 

Georgian Technical University

 

Abstract: This paper presents a powerline network as a reliable and low-cost solution for data transmission supporting VoIP, QoS and streaming media applications due to Cogency MAC/PHY adapters, which adapt automatically  to changing conditions on the power line and provide a reliable channel under the noisiest conditions.

Keywords: powerline, data transmission, QoS, VoIP.

 

 

 

SUMMARY

MONOphase correctors of the power factor in secondary power supply systems

Kobakhidze T.D.

Georgian Technical University

The analysis of possible versions of monophase correctors of the power factor has shown that power factor correctors with high-frequency transformation and two versions of feedback circuit with multiplication and integration are preferable. The version with multiplication provides simple realization of a double-loop control system, and it can be created on the base of digital or analog means. The version with integration allows simple realization of a single-loop control system.

Keywords: power factor corrector, continuous power source, secondary power supply system

 

 

SYNTHESIS OF 2-p-NITROPHENYL-3H-INDOLO[5,4-d]BENZO[b]FURAN   

Chikvaidze I.Sh., Barbakadze N.N., Narimanidze N.O., Targamadze N.L. and Samsoniya Sh.A.

Iv. Javakhishvili Tbilisi  State University                   

The possibility of the synthesis of new derivatives of indolo[5,4-d]benzo[b]furan was investigated. The synthesis of 2-p-nitrophenyl-3H-indolo[5,4-d]benzo[b]furan was carried out by Fischer reaction by indolization of dibenzofuran-3-ilhydrazone of p-nitroacetophenone in polyphosphoric acid. It is shown that dibenzofuran-3-ilhidrazones of other acetophenone derivatives undergo resinification under similar conditions.

Keywords: indole, benzofuran, cyclization, hydrazone synthesis.

 

Synthesis of biodegradable copoly(ester amide) containing L-lysine benzyl ester moieties in the backbones

 

Jokhadze G.A.,  Chu* C.C., Tugushi D.S. and  Katsarava R.D.

 

Research Centre for Medical Polymers and  Biomaterials,

Georgian Technical University

*Fiber and Polymer Science Program, Department of Textiles & Apparel, & Biomedical Engineering Program, Cornell University, Ithaca, New York

 

                                                          

Abastract: Novel random biodegradable co-poly(ester amides) (co-PEAs) were synthesized by copolycondensation of di-p-toluensulfonic acid salts of bis-[L-a-amino acid (L-leucine and/or L-phenylalanine)]- a -alkylene diesters II with active diesters of dicarboxylic acids III using di-p-tolensulfonic acid salt of L-lysine benzyl ester as comonomer I. The polymers obtained showed excellent film-forming properties, and are of interest for various biomedical applications.

Keywords:  amino acids,  active polycondensatioin, biodegradable co-poly(ester amide), benzyl esters

 

SUMMARY

Chelates based on 4-allyl-2-methoxyphenol : synthesis and study

Lekishvili N.G., Samakashvili Sh.Z., Shanshiashvili N.D., Lobzhanidze T.E., and Loria N.V.

Iv. Javakhishvili Tbilisi State University

New Mn-, Co-, Ni- and Cu-containing chelates based on 4-allyl-2-methoxyphenol were synthesized and studied. By using the elemental (comlexonmetry) and IR spectral analyses methods the composition and structure of the synthesized chelates were determined. The possibility of the application of obtained chelates for modification of polyorganocarbo­siloxanes was established.

Keywords : chelates, 4-allyl-2-methoxyphenol, synthesis.

 

Summary

Acid Сonversion of 1-chloro-3,4,6-tri-O-acetyl-2-keto-D-glucopyranose

Itriashvili N.S., Gakhokidze R.A. and Sidamonidze N.N.

Iv. Javakhishvili Tbilisi State University

Under the action of lead hydroxide, 1-chloro-3,4,6-tri-O-acetyl-2-keto-D-glucopyranose was converted into 2-deoxy-D-gluconic acid. The corresponding derivatives of this acid were also obtained.

Keywords: acid conversion, 2-deoxy-D-gluconic acid.

 

Summary

The structure of Barium Hydroacetate Monohydrate Ba(OH)2(CH3COO)H[CH3COO]2

Tsintsadze G.V., Endeladze N.O. and Chubinidze A.D.

Georgian Technical University

Institute of Chemical Reagents and Particularly Pure Chemical Substances, Moscow, Russia

A. Tsereteli Kutaisi State University

The crystalline structure of barium hydrate monohydrate of composition Ba(OH)2(CH3COO)H[CH3COO]2 was determined by Diffractometer CAD-4-SDP. The technical part of the analysis was carred out at IREA (Moscow).

Barium hydroacetate is a monoclinic crystal with the following parameters: a=14.123(4); b=9.554(3), c=8.198(3)Å; b=91.260(1); r(calk)=1.999(4) g/cm3; z=4; space group P21/c. There were registered 3738 reflexes, from them 1814 ones were used for computations (R=0.028; Rw=0.035).

Keywords: barium hydroacetate, monohydrate, crystalline structure.

 

Summary

The structure of Barium Hydroacetate pentahYdrate BaH(CH3COO)3×5H2O

Tsintsadze G.V., Endeladze N.O. and Chubinidze A.D.

Georgian Technical University

Institute of Chemical Reagents and Particularly Pure Chemical Substances, Moscow, Russia

A. Tsereteli Kutaisi State University

The crystalline structure of barium hydroacetate pentahydrate of composition  ВаН(СН3СОО)3∙5Н2О, was determined by Diffractometer CAD-4-SDP. The technical part of the analysis was carried out in IREA. (Moscow). The barium hydroacetate pentahydrate moncrystal was characterrized by the following parameters: а=18.415(6), b=18,541(7), с=7,473(3); a=b=90°; g=120°; V=2194,7(7) ; space group Р6322. There were registered 2304  reflexes, from them 1667 ones were used for computations; R=0.035; Rw=0.040.

Keywords: barium hydroacetate, pentahydrate, crystalline structure.

 

Summary

Chemical composition  of native Gold from svaneti and bolnisi

Tsintsadze M.G., Gachechiladze Kh.Sh. and Poporadze N.G.

Georgian Technical University

By X-ray spectrum microanalysis, there was studied the chemical composition of native gold grains, found on the territory of Georgia (Svaneti and Bolnisi Ore Region), both on their surface and in their interior. In these gold grains, gold, silver, lead, copper, silicon, arsenic, iron, sulfur, zinc and other components were determined. The analysis results showed that the native gold grains under study were characterized by heterogeneous chemical composition, in which the amount of gold varied within the range of 85-97%, silver – 14-15%, copper – 0.7-4.0% etc. At some points of the grain, rather high amounts of silicon and lead were doserved.

Keywords: native gold, Georgian deposits, chemical composition, X-ray spectrum analysis.

 

A New method of synthesis of 2-acetamydo-2-deoxy-D-Glycopyranozyl chlorides

 

Macharadze G.G., Bovin N.V., Khorlin A.J., Gakhokidze R.A., Jikia N.Sh., Giorgadze T.T.

and Sigua L.G.

 

Iv. Javakhishvili Tbilisi State University

 

Abstract. The synthesis of  2-acetamido-2-deoxy-α-D-glycopyranozyl chlorides, containing deri­vatives of mono- and oligosaccharides, from  peracetates of relevant saccharides can be performed by the following procedure. The mixture of anomeric peracetates reacts with hydrazine acetate in dimethylformamide (DMFA) or in its mixture with other organic solvent and transforms into acetate with free semiacetale hydroxyl. The obtained product is immediately treated with thionyl chloride  in DMFA-containing solvent. The physical and chemical constants of the synthesized compounds coincide with the literature ones.

Keywords: glycosylhalogenides, glycosaminylhalogenides, glycosylisothionylcyanates. 

 

А New method of synthesis of 2-Methyl-glyco[2,1-D]-2-Oxazolines

 

Macharadze G.G., Bovin N.V., Khorlin A.J., Gakhokidze R.A., Jikia N.Sh., Giorgadze T.T.

and Sigua L.G.

 

Iv. Javakhishvili Tbilisi State University

 

Abstract. The synthesis of  2-methyl-glyco[2,1-d]-2-oxazolines including mono- and oligosaccharides derived from  peracetates can be obtained by the following method: the mixture of anomeric peracetates of saccharides in the presence of the solvent containing DMFA, and hydrazine acetate is converted into acetate with free  semiacetale hydroxyl by the reaction with hydrazine acetate.  The product is treated in the solvent containing DMFA with thionyl chloride in the presence of 2,6-lutidine. The physical and chemical constants of the synthesized products coincide with the literature ones.

Keywords: 2-methyl-glyco[2,1-d]-2-oxazolines, synthesis.

 

 

SUMMARY

Elaboration of a new technique of Simultaneous determination of lead, zinc, copper and cadmium ions in human hair By differential-pulse Polarography

Japaridze J.I., Enukidze L.G. avd Shavgulidze N.V.

R. Agladze Institute of Inorganic Chemistry and Electrochemistry

Tbilisi State Medical University

The technique of simultaneous determination of Cu(II), Cd(II), Zn(II) and Pb(II) ions in small amount (~1g) of  human hair by differential-pulse polarography was developed. Even small amounts of microelements in the solution were characterized by sharp peaks, which were easily registered in the experiment. Using the technique suggested, there was determined the distribution spectrum of microelements in human hair. The reproducibility of the experiment made up ±1.5%.

Keywords: human hair, polarography, determination of ions, lead, zinc, copper, cadmium.

 

 

 

SUMMARY

X-ray analyses of complex compounds synthesized on the base of copper dinitrate and 3-hydroxybenzoyl hydrazine

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

Georgian Technical University

Tbilisi State Medical University

The X-ray phase analysis and the first stage of X-ray structure analysis of compounds Cu(m-HBH)2 (NO3)2 · nH2O and Co(m-HBH)2(NO3)2 · 5H2O (m-HBH=C7H8N2O2, 3- hydroxybenzoyl hydrazine), synthesized under the same conditions, were performed. There was observed some discrepancy between the results of the X-ray phase analysis and the first stage of X-ray structure analysis.

Keywords: complex compounds, transition metals, hydroxybenzoyl hydrazine, carbonic acid hydrazide, X-ray analysis.

 

 

 

Summary

The effect of the origin of solid support material on the character of separation processes in Gas-liquid chromatography

Eprikashvili L.G., Zautashvili M.G., Rubashvili I.M., Pirtskhalava N.V. and Kakhidze N.A.

P. Melikishvili Institute of Physical and Organic Chemistry

A. Tsereteli Kutaisi State University

There was studied the effect of solid support material (Celite-545 and Chromaton N-AW) on chromatographic properties of stationary liquid phase SE-30 by the example of various model systems. It is demonstrated that even insignificant differences in the properties of solid support materials can change the character of separation of various organic compounds

Keywords: gas-liquid chromatography, liquid phase, solid support, retention volume, adsorptive properties.

 

SUMMARY

determination of phase boundaries in system B-O-C By using the chemical potentials of elements

Eristavi D.V., Gogishvili A.R., Sarukhanishvili A.G., Kutsiava N.A. and Dgebuadze M.O.

Georgian Technical University

The goal of the work was the thermodynamic investigation of system B2O3-C for a wide temperature range and gas phase pressure. The thermodynamics of the involved processes was simulated with the help of a computer using up-to-date thermodynamic data and efficient software. As a result, the optimal conditions of production of boron and its carbide were established for a wide range of component ratios. The temperature of beginning of interactions in the system was determined. The effect of gas phase pressure on the yield of condensed substances at different temperatures and initial component ratios was studied. During the thermodynamic analysis of system B2O3-C, for the gas phase pressure of 10.1 kPa and 1.01 MPa, there were constructed phase diagrams which allowed predicting the optimal conditions of corresponding processes and drawing up the justified notions of their mechanism

Keywords: chemical potential, phase boundary, condensed substances, thermodynamic analysis, simulation.

 

SUMMARY

Inorganic and organic iodine forms in Georgian mineral waters

Supatashvili G.D., Shedania Z.V. and Karsanidze N.K.

Iv. Javakhishvili Tbilisi State University

The content of iodine in Georgian mineral waters was determined by the kinetic (rhodanide-nitrite) method. The difference between the results obtained by the kinetic and microvolumetric iodometric methods was less than 5%. The determined content of iodine in the mineral waters was in the range of 0.035-1.84 mg/l, 10-24% of which accounted for organic forms. By the example of fresh water, it is demonstrated that the content of organic iodine is closely retated to the water oxidation (correlation index is 0.96).

Keywords: iodine, organic forms, inorganic forms, mineral water.

 

SUMMARY

The content of vanadium, arsenic and antimony in the soils of the lukhuni river ravine

Guguchia M.M., Loria N.V., Labartkava N.A. and Supatashvili G.D.

Iv. Javakhishvili Tbilisi State University

The abundance of vanadium, arsenic and antimony in the soils of the Lukhuni River Ravine (Georgia) was investigated. It was determined that, as a result of mining and processing of antimony-containing arsenic sulfide ores, the content of As and Sb in the soils made up several hundred mg/kg, which was 40-50 times more that the crustal abundance. Evidently, with the distance from the main source of pollution (The Ore-Roasting Shop), the content of As and Sb in  the soils decreased (correlation indices were equal to 0.86 and 0.46, respectively). The content of vanadium was rather stable and was close to the crustal abundance.

Keywords: arsenic, antimony, vanadium, content, soils, crustal abundance.

 

Summary

Investigation of mineral waters of georgia

Gvakharia V.G., Khargelia R.G., Gabechava D.Sh., Girgvliani D.A. and Machavariani B.K.

Gamma Research Company

A. Janelidze Geological Institute

 In order to promote the sector of mineral water production, new State Standards have been worked out. Old normative documents were intended for the requirements which have significantly changed for last 15-20 years. The requirements of new standards are to satisfy up-to-date norms enforced in the EU countries in reference to hydrochemical parameters of the products. The hydrochemical investigation of mineral water deposits of Georgia was performed for last three-year period. The deposits of the following mineral waters were studied in detail: Borjomi, Nabeglavi, Sairme, Utsera, Shovi, Mitarbi, Nadibaani, Plate, Skuri, Zvare and Vajas Tskaro. The fluctuation ranges for all deposits were studied and the results were included in standard documents. As a result, two State Standards were worked out, they were submitted to the Georgian Authorities.  They were approved, and the producers are already using those standards. Two documents were issued: one concerns the Borjomi Mineral Waters, and the second - other brands.

For the evaluation of possibilities for the mineral water sector development in Georgia, the market for such products was also studied. The existing market volumes, trends and specifications were analysed. The collected market information was taken into account specificsations during the preparation of National Standards of Georgia.

Keywords: mineral waters of Georgia, National Standards, hydrochemical investigation.

 

Summary

Structural-Group analysis of the residue of the oil

frOm the supsa field (GEORGIA)
Gajiev-Shengelia M.K., Kikoladze V.S., Areshidze G.H., Tolordava M.M., Shengelia S.D. and Amiridze Z.S.

Iv. Javakhishvili Tbilisi State University

P. Melikishvili Research Institute of Physical and Organic Chemistry

The deasphalted residues (boiling temperature > 4500C) of the oil from Supsa Oil Field (Wells No.15 and No.42), Georgia, were analyzed by NMR spectroscopy (1H and 13C). The structural-group composition of hydrocarbons having molecular weights of 743.5 and 850.7 was determined. They contained 52-59 carbon atoms and 66-74 hydrogen atoms in the “average” molecule. The total deficiency of hydrogen (S=2C-H), making up 39-44, was related to the proton deficiency in aromatic structures. From the results of the elementary analysis for the samples under study, the H/C ratio made up 1.25-1.26.  For determination of the structural-group parameters of the oil residues, the method of integral-structural analysis was used.

Keywords: oil, Supsa Oil Field, oil residue, hydrocarbon-type analysis.

 

 

SUMMARY

Dewaxing of diesel fuel with selective solvents

Shavgulidze G.G., Edilashvili I.L., Khetsuriani N.T. and Bakhturidze G.Sh.

P. Melikishvili Institute of Physical and Organic Chemistry

Georgian-American Oil-Processing Company GAOR

By application of the method of dewaxing in slective solvents, there is demonstrated the possibility of production of diesel fuel with improved low-temperature properties from paraffin oil of Georgian fields. The low temperatures of solidification (-130C to –180C) and cloudiness (-80C to -130C) allow us to recommend the produced diesel fuel for the use in winter, taking into consideration the moderate climate of Georgia.

Keywords: diesel fuel, dewaxing, selective solvents.

 

 

 

SUMMARY

SUMMARY

Dewaxing of diesel fuel with selective solvents

Shavgulidze G.G., Edilashvili I.L., Khetsuriani N.T. and Bakhturidze G.Sh.

P. Melikishvili Institute of Physical and Organic Chemistry

Georgian-American Oil-Processing Company GAOR

By application of the method of dewaxing in slective solvents, there is demonstrated the possibility of production of diesel fuel with improved low-temperature properties from paraffin oil of Georgian fields. The low temperatures of solidification (-130C to –180C) and cloudiness (-80C to -130C) allow us to recommend the produced diesel fuel for the use in winter, taking into consideration the moderate climate of Georgia.

Keywords: diesel fuel, dewaxing, selective solvents.

 

 

 

Summary

A new design of the cell of pressure chambers with improved temperature filed for synthesis of diamonds

Loladze N.T., Tserodze M.P., Tserodze Sh.P., Dzidzishvili Yu.G, Meladze G.D., Zaslavski S.I.

and Vezirishvili Sh.D.

Georgian Technical University

The temperature field in pressure chambers of the “anvil-hollow” type with the working value of 25m3 was  determined. There was developed a new circuit of heating and a new design of heat insulation, which improved significantly the patrameters of the process of synthesis of diamonds.

Keywords: heating circuit, pressure chamber, heat insulation, synthesis of diamonds.

 

 

Summary

A new design of the cell of pressure chambers with improved temperature filed for synthesis of diamonds

Loladze N.T., Tserodze M.P., Tserodze Sh.P., Dzidzishvili Yu.G, Meladze G.D., Zaslavski S.I.

and Vezirishvili Sh.D.

Georgian Technical University

The temperature field in pressure chambers of the “anvil-hollow” type with the working value of 25m3 was  determined. There was developed a new circuit of heating and a new design of heat insulation, which improved significantly the patrameters of the process of synthesis of diamonds.

Keywords: heating circuit, pressure chamber, heat insulation, synthesis of diamonds.

 

 

 

 

 

 

 

 

SUMMARY

A new method of determination of nicotine in tobacoo raw materials

Kintsurashvili K.M.

Georgian State University of Subtropical Economy

A simple rapid method of determination of nicotine in tobacoo raw materials was developed for its application  in practice at factory laboratory. It is demonstrated that the presence of nicotine in the tobacco raw material can be determined by using colored chemical reactions based on titration of the water concentrate of tobacco dust. The obtained results are evidence in favor of the proposed method as compared to the standard one. Its advantages consist in shorter duration of the analysis (by a factor of 10 less) and reduction of costs per analysis (by a factor of 13 less). The method allows performing the analysis of bulk raw material in working conditions.

Keywords: tobacco, raw materials, nicotine, determination

 

SUMMARY

Improvement of the quality Indices of cognac alcohol by using active carbon

Khukhunaishvili L.J. and Mujiri L.A.

Research institute of Horticulture, Viticulture and Wine-Making

Active carbon was used for increasing the quality indices of cognac alcohol. It was revealed that the use of active coal at production of cognac alcohol at any stage of production (in wine material or in alcohol raw material) gave rather good results in relation to improvement of quality  indices. It should be noted that it is better to treat the alcohol raw material with active carbon to avoid extra expenses,  because  the active coal is used in smaller amounts during processing of alcohol raw material, though the results in both cases are good.

Keywords: cognac alcohol, quality indices, improvement, active carbon.

 

 

 

 

SUMMARY

The vine as an alternative raw material for manufacture of articles frOm chip-glue presscompositions

Chkuaseli K.G.

Georgian Technical University

The issue of application of the vine in manufacture of wood-chip plates is considered. The economic expediency of the use of vine for the abovementioned purpose is justified. The data on distribution of vine resources by regions are given.

Keywords: vine, wood chips, wood fiber, wood-chip plates, economic expediency.

 

SUMMARy

spread of some fruit cultures by altitudinal zonality IN Georgia

Vasadze Yu.Sh., Gogitidze V.M., Chipashvili Z.V., Mirotadze N.A., Zhgenti M.S., Odilavadze N.G.

and Goginava L.P.

Research Institute of Horticulture, Viticulture and Wine-Making

This work deals with favorable zones for spreading fruit cultures in Georgia with account for basic agroclimatic indices. The fruit culture areas are differenciated by altitude. In each of these areas, frost-perilous zones are revealed.

Keywords: fruit culture, altitudinal zonality, spread.

 

 

SUMMARY

The effect of the structure of polysaccharides of cell walls of plants on their biological activity

Jinjolia Sh.R., Karchava M.S. and Silagadze M.L.

A. Tsereteli Kutaisi State University

N. Muskhelishvili Kutaisi State Technical University

The types of distribution of COOH groups in pectin substances extracted from tea and citrous fruit wastes were studied. It was determined that, in citrous pectins, the COOH groups were distributed  statistically and, in tea pectins, - in the form of blocks, which provided high ion-binding capability of the tea pectins.

Keywords: polysaccharides, pectins, cell walls, biological activity, COOH group, tea, citrous fruit.

 

Summary

Optimization of granulation  of the grape skin

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

Kutaisi State Technical University

Kutaisi State University

The matrix of the central compositional rotatable design of the second order was realized, and adequate equations of regression for describing the process of granulation of the grape skin were derived. By using the Lagrangian indefinite multipliers, the values of variables describing the optimal conditions of the process of granulation were obtained.

Keywords: grape skin, granulation, optimization.

 

 

Summary

Grape Skin Preservation

Lobzhanidze G.V.

Kutaisi State Technical University

The technological scheme of grape skin preservation has been developed. The optimal conditions of skin preservation were established. The scheme of preservation is economically profitable and easy to apply in practice.

Keywords: grape skin, preservation , technological scheme, optimal conditions,