sum17

SUMMARY

1
ON SOME FEATURES OF NATURAL NUMBERS

ABOUT THE AMOUNT OF PRIME NUMBERS (Part I)

Kokilashvili L.G.

Georgian Technical University

There is shown, that if any finite arranged multitude (row) 1, 3, . . . , 2n – 1, including n odd numbers, is continued by more n items, the given continuation with sufficient approximation, includes the (n + 2)/3 amount of prime numbers. Here under the term number, a natural number is meant unless otherwise is stated. The amount of numbers is marked with symbol ∆ before the letter representing the number.

Keywords: natural numbers, compound numbers, prime numbers, multitude, arranged multitude-row.

2
ABOUT THE GOLDBACH HYPOTHESIS (Part II)

Kokilashvili L.G.

Georgian Technical University

The Goldbach hypothesis is considered. The decisive role plays the circumstance that any finite row of natural odd numbers includes complete information about the compound and prime numbers in the second half of the row obtained by double continuation of the abovementioned row.

Keywords: natural numbers, compound numbers, prime numbers, maltitude, arranged maltitude row.

3
ON THE APPROXIMATE SOLUTION TO HALLEN'S INTEGRAL EQUATION

Kotetishvili K.V.

Georgian Technical University

Hallen's integral equation for dipole axial current is transformed into the second-kind Fredholm equation with a pronounced kernel. A rigorous solution to this equation has been found. It is shown that standing current waves along the dipole are generated due to the interference of Ufimtsev-type boundary waves.

Keywords: antenna, dipole, integral equation.

4
ON THE AXIAL CURRENT DISTRIBUTION AND DIRECTIVITY PATTERN OF AN ACTIVE DIPOLE

Kevanishvili G.Sh., Kotetishvili K.V., Vashadze G.K. and Bolkvadze D.R.

Georgian Technical University

Basing on a new analytical solution to Hallen's integral equation, axial current distribution curves and directivity patterns were constructed for an active dipole.

Keywords: dipole, Hallen's integral equation, axial current, directivity pattern.

5
AN INVERSE PROBLEM ON EQUIVALENT STIFFENING OF A PLATE WITH A CIRCULAR HOLE

Imedadze L.R.

Georgian Technical University

There is considered a problem of optimal designing of the circular perforated plate widely used in various constructions. There was stated and solved the inverse problem of the flat elasticity theory for length h of multiconnected plates which are stiffened with prestressed thin elastic ribs of isotropic stiffness. The example of complete neutralization for the plates weakened by the R radius hole is demonstrated.

Keywords: plate, circular hole, equivalent stiffening, inverse problem.

6
AXISYMMETRIC BENDING OF A CIRCULAR PLATE STIFFENED WITH A SUPPORTING RIB

Imedadze L.R.

Georgian Technical University

There has been studied the effect of a supporting rib on the elastic equilibrium of a circular plate undergoing axisymmetric bending under uniformly distributed load. It was established that the supporting rib reduced significantly the maximum bending, bending moments and stress in the plate.

Keywords: cicular plate, stiffening rib, axisymmetric bending.

7
ON THE NUMERICAL SOLUTION TO A CLASS OF SINGULAR INTEGRAL EQUATIONS

Kublashvili M.D.

Georgian Technical University

There is proposed the design of a justified numerical scheme for the first-kind singular integral equations in the case of open circuits. The approximation order of this scheme has been established.

Keywords: singular integral equations, open circuit, numerical scheme, design, approximation order.

8
NUMERICAL SOLUTION TO THE PROBLEM OF A LONGITUDINAL SHEARING CRACK IN AN ELASTIC BODY

Kublashvili M.D.

Georgian Technical University

The problem of a longitudinal shearing crack in an elastic body is reduced to calculation of the following integral:

.

For approximate calculation of this integral, the approximation scheme was developed and its accuracy was estimated. The results of the approximate integral calculation are presented.

Keywords: elastic body, longitudinal shearing, crack, numerical solution, integral.

9
ON THE DEVELOPMENT OF A COMPUTATIONAL SCHEME OF A HIGHER-ORDER ACCURACY FOR THE METHOD OF DISCRETE VORTEXES IN THE CASE OF OPEN CIRCUITS

Kublashvili M.D.

Georgian Technical University

There is proposed the development of a quadratic formula for singular integrals. It has a higher-order accuracy as compared with the classic quadratic formula for the method of discrete vortexes in the case of open circuits.

Keywords: singular integral, open circuit, method of discrete vortexes, higher-order accuracy.

10
investigation of the second-order symmetric composition desiGns close to the g-optimal ones for three variables in the sphere octant

Beraia N.O.

Georgian Technical University

There was studied G-optimality - one of the properties of the second-order central symmetric composition designs, which are associated with the precision of response prediction with the help of model construction. The investigation was carried out for the areas in the form of sphere octants of various sizes. The optimum values of the "star"-branch, providing the minimum of the prediction variance maximum, were found. Scanning of the areas was carried out as well when some points were added in the design center. That allowed determining the optimum number of points for the abovementioned criterion in each of the areas studied.

Keywords: experiment designing, symmetric composition designs, sphere octant.

11
ON THE APPLICATION OF TOPOLOGY TO THE SOLUTION OF GRAPHIC PROBLEMS

Khatiskatsi I.E., Nikvashvili N.K. and Gurtskaia G.A.

Georgian Technical University

There is proposed a diagram of the problem of topologic transformation in a drawing. Application of this transformation to the solution of a particular positional problem of descriptive geometry is demonstrated.

Keywords: graphic problems, topology, solution, diagram.

12
THERMODYNAMICS OF A GAS-TURBINE DEVICE NEGLECTING THE COMPRESSION WORK

Jamarjashvili V.A. and Arabidze G.O.

Georgian Research Institute of Energhetics and Power Constructions
Georgian Technical University

There is considered thermodynamics of the gas turbine device neglecting the compression work, in particular the reversible thermodynamics of a combined energy device (CED) based on the use of overpressure gas of the Gas Regulation Station. The efficiency, specific value of equivalent fuel consumption and turbine coefficient of the CED for different values of П and have been determined.

Keywords: thermal pollution, ecothermal power plant, gas turbine, steam turbine, efficiency, heat-power device.

13
BORON-BASED TEMPERATURE SENSORS

Kervalishvili P.J., Tabutsadze M.L. and Sanaia E.T.

Sensory Materials and Electronics Scientific Technology Center

Among the so-called "high temperature semiconductor materials", boron and its compounds demonstrate good physical and chemical features as sensitive elements for temperature sensors. They are semiconductor materials (mainly boron, boron carbide and aluminum-boron compounds) with a high melting point, mechanical/chemical strength in corrosive media and strong atomic bonds providing high stability in the radiation area. To raise its radiation resistance under neutron irradiation, boron is enriched with the ¹¹B isotope. Crystalline and compact pellets of boron (and its compounds) were prepared by vacuum synthesis, melting zone, free crystallization and vacuum hot pressing methods. The studies of their properties such as the temperature resistance, voltage-current characteristics, ice melting point sensitive response, structural stability, etc. showed a high temperature resistance coefficient and linearity of voltage-current parameters within their operational range. From this it follows that boron and its compounds are promising materials for the sensitive elements of temperature sensors.

Keywords: boron, semiconductor materials, sensors, sensitive elements, radiation-resistant isotopes.

14
CLEANING OF THE CYLINDRICAL SURFACE OF GAS PHASE POLYCRYSTALLINE TUNGSTEN

Zykov B.M. and Nardaya Yu.I.

Sukhumi Physical-Engineering Institute

A method of cleaning the gaseous polycrystalline tungsten coating on the Nb+1%Zr alloy from carbon impurities is presented. The method consist in removing the impurities in vacuum at high temperature (up to 1625K). Among the formed compounds, it is most difficult to remove tungsten carbide, for isolation of which the temperature of 2075K is necessary. At the same time, the coating material is subject to high dispersion already at 1925K.

Keywords: gas phase polycrystalline tungsten, surface, cleaning.

15
ON THE FABRICATION OF NANOCRYSTALLINE TITANIUM CARBIDE USING TiCl₃

Jalabadze N.V., Miminoshvili E.B., Sakvarelidze T.N., Chedia R.V. and Mikeladze A.G.

Georgian Technical University

A possibility of fabrication of nanocrystalline titanium carbide from an aqueous solution of TiCl₃ has been studied. The 15% aqueous solution of titanium(III) chloride a priori contains Ti-O bonds in the form of an aquacomplex. For elimination of the molecules of water in its inner coordination area and for their substitution for oxygen-free ligand, there were used various complex-forming compounds. It was shown that, in alkali, neutral, acid and even strong acid atmosphere, it was impossible to avoid formation of the Ti-O bond. That was the reason why titanium carbide could not be fabricated from these materials. For fabrication of titanium carbide, it is necessary to use only waterless TiCl₃.

Keywords: titanium carbide, nanocrystalline materials, complex compounds, synthesis.

16
LOW-TEMPERATURE SYNTHESIS OF MOLYBDENUM CARBIDE

Jalabadze N.V., Chedia R.V. and Mikeladze A.G.

Georgian Technical University

The equilibrium diagram of the Mo - C system has been analysed. For obtaining molybdenum carbide being homogenous by structure and morphology, the system MoCl₅-polymer-dissolvent was used. A possibility of a production of a-Mo₂C by low-temperature synthesis was established using X-ray- and electron-diffraction methods.

Keywords: molybdenum carbide, nanocrystalline materials, polymers, synthesis.

17
VISCOSITY AND FINE STRUCTURAL TRANSFORMATIONS IN β-ALLOYS OF THE Cu-Zn SYSTEM OVER THE TEMPERATURE RANGE OF 20-600ºC

Kutelia E.R., Kobakhidze G.M., Maisuradze N.I., Kukava T.G. and Darsavelidze G.Sh.

Republican Center of Structural Research of Georgian Technical University

The viscosity and fine structural transformations in β-alloys of the Cu-Zn system were studied over the temperature range of 20-600ºC. The total correlation between structural transformations proceeding in the β'-phase of the Cu-Zn system alloys with relaxation phenomena was established. Basing on the obtained results, it can be stated that the relaxation spectrum features detected for the β'-phase of the Cu - 47%Zn alloy and the strength anomalies are associated not only with the mechanism of the interaction between the superlocation and the vacancies, as is described in the literature, but with the processes of multi-stage disintegration and reordering in the β'-phase as well.

Keywords: Cu-Zn system, β-alloys, structural transformations, viscosity.

18
THERMODYNAMIC ANALYSIS OF CHEMICAL AND PHASE TRANSFORMATIONS DURING CARBOTHERMAL REDUCTION OF BORIC ANHYDRIDE

Abzianidze T.G., Bairamashvili I.A., Gelashvili G.Sh., Kasradze V.G., Chkhikvishvili V.B. and Shalamberidze S.O.

Institute of Stable Isotopes

Using the first variation principle of thermodynamics, a detailed computational study of the equilibrium composition in the B-O-C system was performed for a wide temperature and pressure range at various B₂O₃ : C ratios. For the pressure not exceeding 1.5 bar, boron carbide formation in the B-O-C system occurs at 1700 – 2500 K. Theoretically, an ultimate fractional conversion of B₂O₃ into B₄C makes up 93% at 1800 K and 98 % at 2400 K in the mixture of the stoichiometric composition (B₂O₃ + 3.5C) and in that of the excessive carbon content. For the boric anhydride-rich mixture (B₂O₃ + 2C), the upper limit of a fractional conversion of B₂O₃ into B₄C makes up only 40 – 50% and is observed in the 1800 K - 2200 K temperature range. The reactions involving both gaseous boron-containing components, mainly (B₂O₃)_gas and its dissociation fragments, and carbon monoxide play a key role in the boron carbide formation.

Keywords: boron carbide, boric anhydride, carbon, carbothermal reduction.

19
OPTIMUM CONDITIONS FOR INTENSIVE AND STABLE PRODUCTION OF BIOGAS IN A SMALL-SCALE ONE-STAGE BIOGAS REACTOR

Dudauri T.V., Partskhaladze G.Sh., Chachkhiani M.T., Tsiklauri L.N. and Kurashvili L.G.

High Technology National Center of Georgia

A comparative study on the biogas production rate under different conditions in one-stage batch and plug-flow bioreactors was performed. Concentrates of cellulose-degrading and methane-forming bacteria isolated from swampy soil and from thermophilic biodigester working on cattle manure were used for process intensification. A bacteria immobilizer was selected and tested for maintaining the process stability in the plug-flow bioreactor. The influence of the biomass load rate on the biogas productivity from cattle breeding wastes was studied. Quantitative data on the relative effect of these parameters are presented. The biomass load rate and temperature are the most important factors for biogas intensive and stable production. Addition of bacteria concentrates in the biogas reactor facilitates in rapid start and process intensity. Immobilization of the bacteria in the biogas reactor promotes the process stability in the plug-flow system.

Keywords: biogas production, small-scale biogas reactor, anaerobic digestion, bacteria immobilization.

20
DESIGNS OF FORMING THE GB-ELEMENTS

Nadareishvili L.I., Topuridze N.S., Gvatua Sh.Sh., Pavlenishvili I.J., Sharashenidze L.K., Blagidze E.M. and Japaridze K.G.

Institute of Cybernetics

The devices with the ability of establishing mechanical fields with specified heterogeneity for formation of GB-elements are described. These elements differ in the character of deformation: 1) longitudinal and lateral tension/compression simultaneously; 2) longitudinal tension and lateral compression simultaneously; 3) only longitudinal tension.

Keywords: GB-elements, deformation, heterogenic mechanical fields.

21
INVESTIGATION OF THERMAL PROPERTIES OF SURFACE-MODIFIED CLINOPTILOLITE

Tsitsishvili V.G., Alelishvili M.V., Dolaberidze N.M., Chipashvili D.S., Kvantaliani L.P., Mirdzveli N.A. and Nizharadze M.O.

P.Melikisvili Institute of Physical and Organic Chemistry

The surface-modified clinoptilolite-containing tuff of Rkoni Deposit, Georgia, was studied by the method of thermal analysis. It was determined that, as a result of treatment of clinoptilolite with the hexadecyltrimethylammonium (HDTMA) solution of different concentration, organic molecules stay at the zeolite surface even at roasting of the modified samples at the temperature close to 400ºC.

Keywords: zeolite, clinoptilolite, modification, surface active substances.

22
SOME REGULARITIES OF ELECTRODEPOSITION OF MANGANESE FROM AQUEOUS SOLUTIONS

Garbrichidze M.S., Agladze T.R. and Kapanadze L.G.

Georgian Technical University

The effect of such parameters of electrolysis as cathode current density, temperature, and concentration of manganese and ammonium ions on the process of manganese electrodeposition has been studied. The tests were carried out in ultra-pure electrolytes and solutions with addition of sodium selenate. The optimum electrolysis conditions for producing metallic manganese with high current efficiency are presented.

Keywords: manganese electrodeposition, aqueous electrolytes, current efficiency, optimum conditions.

23
INVESTIGATION OF CHROMATOGRAPHIC PROPERTIES OF A HYDROQUINONE-BIS-(n-HEPTYLOXYBENZOATE) LIQUID CRYSTAL BY FILAMENT CHROMATOGRAPHY

Amirkhanashvili K.D., Andronikashvili T.G., Nadiradze N.A., Dalbashvili N.I. and Burkiashvili N.O.

P.Melikishvili Institute of Physical and Organic Chemistry

The liquid crystal of hydroquinone-bis-(n-heptyloxybenzoate) is demonstrated to operate well over the temperature range of 403-443K, when it is in a nematic mesophase. Application of CO₂ as a gas carrier improves its adsorptive properties. This liquid crystal phase can be used for separation of n-hydrocarbons, C₆-aromatic hydrocarbons and some alcohols.

Keywords: liquid crystal, hydroquinone-bis-(n-heptyloxybenzoate), properties, filament chromatography.

24
NEW SOLID SUPPORTS FOR GAS CHROMATOGRAPHY BASED ON NATURAL ZEOLITES

Amirkhanashvili K.D. and Tavamaishvili K.G.

P.Melikishvili Institute of Physical and Organic Chemistry

There is considered a possibility of application of natural zeolites of sedimentation origin, namely, clinoptilolite-, mordenite- and diatomite-containing rocks from industrial deposits of Georgia for production of silicon-containing materials to be further used as solid supports. After alkali-acid treatment, the rocks were calcined at ~1000⁰С for 8 hours. The obtined solid mass, enriched with silica and practically free of oxides of the R₂O₃type, was used as a solid support. The mixture of saturated hydrocarbons, monoatomic alcohols and aromatic hydrocarbons served as a model system. It was established that the mordenite-based and diatomite-based solid supports and solid support Chromatone N-AW are close to each other in their chromatographic properties.

Keywords: gas-liquid chromatography, solid supports, zeolites, application.

25
THE EFFECT OF THE SOLID SUPPORT MATERIAL ORIGIN ON THE ADSORPTION VALUE OF COMPOUNDS SUBJECTED TO CHROMATOGRAPHIC TREATMENT IN A FIXED PHASE

Amirkhanashvili K.D. and Tavamaishvili K.G.

P.Melikishvili Institute of Physical and Organic Chemistry

There was studied the adsorptive activity of solid support materials produced from natural zeolites of sedimental origin from industrial deposits of Georgia. There were calculated the following parameters: adsorption temperature, adsorption proportion on the solid support material and adsorption proportion in fixed liquid (squalane, polyphenyl ether (5 Ph), and 1,2,3 - tris (β-cyanethoxy) propane). It is shown that the adsorptive interaction proportion depends on the origin of both the solid support material and fixed liquid phase.

Keywords: chromatography, solid support material, fixed phase, adsorption.

26
EXTRACTION CONCENTRATION OF PALLADIUM AND GOLD USING 3,5 DYPHENYL-1-THIOCARBAMIDOPYRAZOLINE AND DETERMINATION OF THEIR CONTENT IN MADNEULI ORES

Tsintsadze M.G., Memanishvili I.P., Kutsiava N.A., Eristavi V.D., Jorbenadze R.P. and Tsintsadze G.V.

Georgian Technical University

The possibility of application of 3,5 dyphenyl-1-thiocarbamidopyrazoline to extraction concentration of noble metals was studied. The proposed method was used for extraction of metals from polymetallic ores of Madneuli Deposit (Georgia). The content of noble metals was determined by a spectral method. There is inferred that 3,5 dyphenyl-1-thiocarbamidopyrazoline is a rather promising reagent for group extraction concenreation of noble metals and their separation from copper.

Keywords: noble metals, ores, extraction, 3,5 dyphenyl-1-thiocarbamidopyrazoline.

27
method of partial oxidation of copper powders TO Cu₂O

Chedia R.V., Kalatozishvili L.A., Khananashvili L.M., Mtskhvetadze L.G., Beroshvili M.G. and Shavladze D.M.

Iv. Javakhishvili Tbilisi State University

There is presented the method of obtaining copper powders partially oxidated to Cu₂O (3-80%), which are used as catalysts of direct synthesis of methylchlorsilanes.The method is realized by oxidation of copper powder in the stream of air in the boiling layer and by reduction of CuO at the temperature of 400-500ºC in the presence of inert gas with the part of not-oxidated metallic copper.The method allows keeping the original sizes of the initial particles after oxidation.

Keywords: copper, copper oxide, oxidation, thermodiffusion, catalyst, direct synthesis.

28
DETERMINATION OF SULFURIC HYDRAZINE BY COULOMETRIC BROMOMETRY

Demetrashvili Kh.R. and Demetrashvili R.A.

Georgian Technical University

A coulometric procedure for determination of hydrazine salts has been developed. As a titrant, there was used the bromine from acid solutions of potassium bromide generated at a glassy carbon anode.

Keywords: coulonometry, hydrazine, determination procedure.

29
EXTRACTION-PHOTOMETRIC DETERMINATION OF NICKEL WITH THE USE OF SULFONITRORHODASOLE

Mgaloblishvili N.O. and Telia N.M.

Iv.Javakhishvili Tbilisi State University

The extraction of nickel(II) sulfonitrorhodasole using various organic solutions was studied. N-butyl alcohol appeared to be the best extractive agent. The effect of various factors on the optical density of the extract was determined. Basing on the obtained experimental data, a new extraction - photometric method, which allows determining Ni(II) in the range of 0.05-1.0 mg/ml, was developed. The method was justified by the analysis of standard alloy specimens. The proposed method provides precise results (S_r=0.073-0.089).

Keywords: nickel, extraction, photometry, sulphonitrorhodasole.

30
INFLUENCE OF ORGANIC SOLVENTS ON THE DEGREE OF DISPERSION AND OPTICAL DENSITY OF BARIUM SULPHATE SUSPENSION

Takaishvili N.V. and Supatashvili G.D.

Iv.Javakhishvili Tbilisi State University

The influence of organic solvent (methanol, ethanol, isopropyl alcohol, bythanol, ethylene glycol, aceton) nature and concentration upon the precipitation process and optical properties of the BaSO₄ suspension were studied by optical microscopy and sedimentation methods. There was found an original dependence of optical density of the BaSO₄ suspension on ethanol concentration (<1%), which can be explained by formation of ethanol-water associates.

Keywords: organic solvents, ethanol, BaSO₄ suspension, optical density.

31
TRIHEXYLARSENITE FORMATION KINETICS

Niniashvili N.T., Bezarashvili G.S., Dzotsenidze Z.G., Gigauri R.D. and Kekenadze M.G.

Iv.Javakhishvili Tbilisi State University

The reaction of arsenous anhydride As₂O₃ with hexanol 1C₆H₁₃OH under nonisothermic conditions was investigated. Basing on the experimental data, the change in the As₂O₃ transformation degree was calculated. By statistical processing of the experimental results, numerical values of the kinetic reaction parameters were obtained. There was derived the calculation curve which satisfies the experimental results at b=0.2.

Keywords: trihexylarsenite, formation, kinetics.

32
KINETICS OF THE REACTION OF ORTHOARSENIC ACID WITH BUTYL ALCOHOL

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

Iv.Javakhishvili Tbilisi State University

The rate of chemical reaction of orthoarsenic acid with butanol-1 has been studied by means of simple distillation procedure. Differential and integral methods were used for statistical treatment of the experimental data. From the results obtained it can be concluded that the reaction in question is of the second order with respect to acid. The numerical value of the corresponding kinetic factor is presented.

Keywords: kinetics, arsenic acid, esterification.

33
HIGH-TEMPERATURE OXIDATION KINETICS OF LOW-ALLOYED CHROMIUM

Mikadze O.I., Bulia B.P., Maisuradze N.I., Kvatadze Z.A. and Sanikidze Z.J.

F.Tavadze Institute of Metallurgy and Materials Science

Georgian Technical University

The kinetics of oxidation of low-alloyed chromium in air has been investigated over the temperature range of 1300-1400ºC. The net-projection numerical method was proposed for solution of the kinetics equation, taking into account the formation of the oxide film during heating the speimens up to the test temperature.

Keywords: oxidation kinetics, diffusion barriers, sublimation, specific weight gain.

34
INVESTIGATION OF ADSORPTION DENORMALIZATION OF THE DISTILLED GASOLINE FRACTION OF SAMGORI OIL

Datashvili T.K., Gajiev-Shengelia M.K., Areshidze G.Kh and Bezarashvili G.S.

Iv.Javakhishvili Tbilisi State University

The process of adsorption denormalization of the distilled gasoline fraction of Samgori oil (Georgia) was studied. The obtained experimental results were processed statistically. The coefficient of parabolic equations of empiric regression were derived. The optimum process conditions (temperature: 103˚C; volumetric rate of raw material feeding: 0.24 hour^-1) were established. In this case, the degree of extraction of normal paraffins was 87.5%; the purity of the extracted normal paraffins was 98-100%.

Keywords: adsorption denormalization, distilled gasoline fraction, Samgori oil.

35
INVESTIGATION OF THE PRESSURE EFFECT ON SEPARATION OF THE LIGHT FRACTION OF OIL

Amirkhanashvili K.D., Dalbashvili N.I. and Nadiradze N.A.

P.Melikishvili Institute of Physical and Organic Chemistry

The pressure effect on the separation efficiency of a chromatographic column has been studied. The pressure decreases along the column, which affects the column efficiency. To make the pressure almost the same at the column inlet and outlet, a special barrier was placed at the outlet of the column. As a result, more symmetrical peaks were obtained and the column efficiency increased. That was proved by efficient separation of the light fraction of oil.

Keywords: gas chromatography, column efficiency, pressure, light fraction of oil, separation.

36
INVESTIGATION OF THE DEASPHALTED RESIDUE OF COMMERCIAL OIL FROM TARIBANI DEPOSIT BY NMR SPECTROSCOPY

Gamezardashvili D.Z., Gajiev-Shengelia M.K., Areshidze G.Kh and Aliyev B.M.

P.Melikishvili Institute of Physical and Organic Chemistry
Yu.Mamedaliyev Institute of Petrochemical Processes, Azerbaijan

The results of the investigation of the deasphalted residue (boiling point > 500ºC) of commercial oil from Taribani Deposit, Georgia, by NMR-¹H spectroscopy are presented. There was determined the content of hydrogen atoms in aromatic structures, in groups CH₃, CH₂ and CH bound to the aromatic ring (H_α), in methylene and methine fragments (H_β), and in terminal methyl groups (H_γ). The concentration of the mentioned groups in the studied samples was determined. A distinguishing structural feature of the deasphalted residue of the oil under investigation is a rather high cycle of its medium molecules (K_H≈ 8) with extremely short alkyl substituents of naphthenic rings. There is inferred that the deasphalted residue of commercial oil from Taribani Deposit is of a more naphthenic character. The aromatic hydrocarbons make up only 19% and are characterized by very short substituents - C₁-C₂ maximum.

Keywords: Georgian oil, deasphalted residue, NMR spectroscopy, properties.

37
ON THE PROBLEM OF EFFICIENCY OF A TECHNICAL SYSTEM WITH CONSIDERATION OF ITS RELIABILITY

Mikadze Z.I. and Museridze N.D.

Georgian Technical University

There is considered a mathematical model of item treatment on a machine with its reliability taken into account in case of two types of failures: 1. an unpredictable failure distributed by the exponential law and detected by continuous control at the moment of its occurence 2. a wear - out failure detected by periodical control. In these conditions, the function of treatment time distribution and its mathematical expectation have been found.

Keywords: technical system, reliability, repair, failure, mathematical expectation.

38
MACHINE SYSTEM RELIABILITY

Mikadze I.S. and Museridze N.D.

Georgian Technical University

A machine system, divided into two parts: equipment and a tool, is considered. A tool failure is distributed by the arbitrary law while an equipment failure is distributed by the exponential law. The repair time is distributed by the arbitrary law. The coefficient of readiness is determined.

Keywords: reliability, failure, repair, machine, tool.

39
ON THE EFFECT OF ERRORS OCCURRING IN COMMUNICATION CHANNELS

Mikadze I.S. and Arabuli N.V.

Georgian Technical University

There were determined the functions of time distribution of data packet transfer, its mean value, effective values of packetization and transfer rates, which provide maximum communication channel capacity.

Keywords: communication channel, packetization, channel capacity.

40
LARGE IMPULSE CURRENT SOURCE FOR DYNAMIC TESTING OF PIEZOELECTRIC TRANSDUCERS

Nemsadze Sh.A.

Georgian Technical University

A large impulse current source generating an impulse magnetic field is used to determine dynamic characteristics of piezoelectric transducers of impact acceleration. Acting on the side of a bar – waveguide, the developed source induces a short-time impact, thus affecting the transducer without a dispersion effect. The source generates the impulse current of 10 kA with the pulse duration of 20 μs at the magnetic flux density of 5-7 Tesla, which provides generation of the impact acceleration with the pick value of 5 · 10³m/s².

Keywords: piezoelectric transducers, impulse current, dynamic testing.

41
DETERMINATION OF THE TIME OF ENTERING THE BLOCK SYNCRONISM OF LINEAR CODE 3B4B

Svanidze R.G., Nanobashvili V.Vas. and Nanobashvili V.Vic.

Georgian Technical University

The comparative analysis of alphabets of the 3B4B code on the basis of ensuring the least time for entering the block synchronism has been carried out. It is shown that all the alphabets of the code can be considered as equivalent on the basis of reestablishment of the block synchronism. Therefore, this is not a determinative feature upon selection of a working alphabet.

Keywords: block synchronism, true phase position, alphabets of the 3B4B code, disparity, allowed combinations, forbidden combinations.

42
ANALYSIS OF STATIONARY CHARACTERISTICS OF A QUEUEING SYSTEM MODEL

Khocholava V.V.

Georgian Technical University

There is studied a single-channel queueing system in a stationary state when the queueing system is subjected to stable failures distributed by the hyperexponential law, the input request flow is the Posson's one, and the service and recovery time is distributed by the arbitrary law.

Keywords: queueing system, model, reliability, stationary chatacteristics, analysis.

43
INVESTIGATION OF THE PROPERTIES OF THE BASIC ALGORITHM OF ADAPTIVE IDENTIFICATION

Odisharia G.B. and Kochoradze G.I.

Avtomatmretsvi Research Institute, Rustavi
Iv.Javakhishvili Tbilisi State University

The properties of various implementations of the so-called basic algorithm representing a general solution to the corresponding problem of identification are considered. Basing on the corresponding computer – aided experiment, the convergence rate was studied. The investigation showed that the more memory depth is used the better is the convergence of the algorithm implementation.

Keywords: basic algorithm, adaptive identification, implementation, convergence.

44
HYDRAULIC COMPUTATION OF TRANSIT GAS CONDUITS FROM POLYETHYLENE PIPES

Kherodinashvili I.Sh.

Hydroproject Institute

There is proposed a method for hydraulic computation of gas conduits from polyethylene pipes with hydraulic resistance factors derived from Hermann-Schiller, Richter, Lorenz, Jacob-Erk and Leese relations. The obtained analytical relation can be used for determination of hydraulic and/or geometric parameters of polyethylene gas conduits.

Keywords: gas conduit, polyethylene pipes, hydraulic computation.

45
HYDRAULIC COMPUTATION OF POLYETHYLENE GAS CONDUITS WITH TRANSIT AND EN ROUTE FLOW RATES

Kherodinashvili I.Sh.

Hydroproject Institute

Hydraulic computation for polyethylene gas conduits with transit flow rate and continuous extraction en route is considered. There was obtained the first-order differential equation in relation to the pressure, which is solved by numerical methods.

Keywords: gas conduits, polyethylene pipes, hydraulic computation.

46
OPTIMUM TACHOGRAM AND SPEED DIAGRAM ALONG THE WAY FOR THE ELECTRIC DRIVE OF JIG-BACK AERIAL TRAMWAYS WITH INTERMEDIATE SUPPORTS

Laoshvili D.P., Chunashvili B.M. and Tugushi M.A.

Georgian Technical University

The optimum movement tachogram and speed diagram along the way have been worked out for the electric drive of jig-back aerial tramways with intermediate supports. Their mathematical description is presented. Realization of these tachogram and speed diagram provides the improvement of dynamic properties of the position electric drive.

Keywords: jig-back aerial tramway, electric drive, tachogram, speed diagram.

47
DEVELOPMENT OF A SYSTEM OF INTERFACES FOR DESIGNING THE EXPERT ESTIMATION PROCESSING SOFTWARE

Shonia O.B.

Georgian Technical University

The problems of designing the software form automated information control system applied to the field of national security are considered. The techniques of the integrated use of a relational database management system Petri networks and UML technology are offered. In particular, there has been constructed automated information system "Expert estimations" in the environment of the Paradigm Plus program.

Keywords: expert estimations, interface, processing, software, information system.

48
A COMMUNICATION CHANNEL WITH THE EXPONENTIAL LAW OF TRANSFER TIME DISTRIBUTION

Khocholava V.V.

Georgian Technical University

There is considered a communication channel model when a packet is transferred by the exponential law of transfer time distribution. The mathematical expectation of the random time of multiple packet transfer has been determined.

Keywords: communication channel, exponential law, transfer time, distribution.

49
CROSS-COUNTRY CAPABILITY AND STABILITY OF THE MECHANISMS ON A TRACKED DRIVER DURING LOGGING IN MOUNTAIN CONDITIONS

Chalaganidze Sh.I. and Kokaia G.G.

Georgian Technical University

The problems of pitching and rolling stability of tractors on a tracked driver are considered. In particular, there has been studied a self-loading logging vehicle retooled from production-type tractor TT-4M.

Keywords: tractor, logging, stability, cross-country capability.

50
ON THE DETERMINATION OF BASIC PARAMETERS OF TEABUSH TRIMMERS

Khomasuridze B.S. and Gurtskaia P.A.

Georgian Technical University

The basic parameters of active parts of teabush trimmers are considered. The corresponding computation equations are presented.

Keywords: teabush trimmer, basic parameters, computation.

51
ON THE DETERMINATION OF INERTIA MOMENTS OF A WORKING SEGMENT OF TEABUSH TRIMMERS

Khomasuridze B.S.

Georgian Technical University

The calculated experimental numerical value of inertia moments of a working segment of teabush trimmers are presented.

Keywords: teabush trimmer, working segment, inertia moment.

52
RESULTS OF GEODYNAMIC INVESTIGATIONS AT ENGURI HPP AS THE BASE OF PREDICTING THE EXTREME HYDRODYNAMIC PROCESSES IN THE RESERVOIR AND THE DAM SAFETY

Gvelesiani T.L., Matcharadze G.T., Nieto D., Noniev I.K. and Piccolo M.

Georgian Technical University PIU of Enguri HPP Rehabilitation Project
National Institute of Oceanography and Experimental Geophysics, Italy
DIANDHES JSC - Centre of Diagnostics and Monitoring of Constructions
Eurekos SRL, Italy

The review on the geologic and geophysical observations having been carried out since 1967 in the region of the dam and reservoir of Enguri HPP during its construction and operation period is presented. The data of these investigations can be used in prediction of extreme waves caused by a seismo-tectonic displacement at the bottom or by landslide mass collapse in water from the bank slopes in the reservoir of Enguri HPP. That is essential for safe operation of the hydraulic project and ecological stability of the adjacent region.

Keywords: Enguri HPP, dam, reservoir, geodynamics, hydrodynamics, geophysical monitoring.

53
A METHOD OF DISEASE PROGNOSIS USING SENSORY ENERGY

Kadagishvili L.G. and Eradze E.G.

Institute of Cybernetics

One of the simplest methods of determining the disease using sensory energy is presented in the form of a model.

Keywords: prognosis, disease, sensory energy, model.

54
THE HEMOSTASIS METHOD USING PLANT POLYPHENOLS

Chkhaidze M.J. and Shioshvili T.I.

State Medical Academy

There is demonstrated a method of preventing the hemorrhage and TURP syndrome using polymeric substance Buta. The results of the experimental investigation (on 17 dogs and 10 rabbits) showed that substance Buta introduced into a prostate underwent deep polymerization at the contact with the hot loop of a resectoscope and formed a thin film having well-defined adhesive properties. This performs embolization of blood vessels, prevents hemorrhage, absorption of the rinsing liquid and development of the TURP syndrome.

Keywords: hemostasis, TURP, plant polyphenols, method.

55
CAN THE CONCEPT OF THE ENERGY-INFORMATION DUALISM EXPAND THE KNOWLEDGE OF THE LIFE AND DEATH REGULARITY?

Khvedelidze M.A.

Institute of Cybernetics
Georgian Engineering Academy
International Informatization Academy

The realization of the concept of the energy-information dualizm (EIDC) and the corresponding complex measurement of the energy-information work self-organization in respect to multiple processes proceeding in natural systems is demonstrated. The abovementioned has allowed the author to state that the EIDC is a justified regularity in the material world. At the same time, close attention should be paid to the forced transition from self-creation of the energy-information dualism to clear self-destruction - death, i.e. to violation of the universal self-organization of the energy-information work of matter. That leads to cessation of the evolutionary development of material systems, and the phenomenon of life, which are kept by the energy-information principle of conservation.

Keywords: energy-information dualism, energy-information work self-organization, regularity of life and death.

56
ON THE PROBLEM OF ORIGIN OF LIFE

Berria G.N.

Georgian Engineering Academy

The essence of life as a fundamental property of matter is substantiated on the basis of a new concept of electric and magnetic flux quantums, which we have called milsims (string-tubes) and assumed as initial universal elements of matter in the form of strings or tubes. Life is a process of exchanging emotional and informational potentials between the micro- and macro- worlds via a multistage link according to the following scheme: milsims – elementary particles – atomic nuclei – atoms – molecules – cells – organism – human being –environment – space – Universe. Biological life is a special case of the more fundamental life of primordial matter.

Keywords: life, origin, matter, concept, flux quantums.

57
TEMPERATURE DEPENDENCE OF INTERNAL FRICTION AND A DYNAMIC SHEAR MODULUS IN THE TlInSe₂ CRYSTALS

Davarashvili O.I., Darsavelidze G.Sh., Enukashvili M.I., Kekelidze N.P., Kutelia E.R., Aliyev V.A., Mamedov T.S. and Tanoglu M.

Iv. Javakhishvili Tbilisi State University
Georgian Technical University
Institute of Physics NAS, Azerbaijan
Izmir Institute of Technology, Turkey

By measuring the temperature dependence of internal friction, such defects as dislocations and vacancies with different relaxation parameters in the Tl In Se₂ crystals were revealed.

Keywords: internal friction, dislocations, point defects.

58
BASIC PROPERTIES OF THE METHODS FOR STUDYING THE WAVES GENERATED BY A LANDSLIDE IN A RESERVOIR

Jinjikhashvili G.I. and Gvelesiani T.L.

Israel Electric Company
Georgian Technical University

The experimental and theoretical (analytical, numerical) methods for investigation of high waves caused by landslides in reservoirs and basic properties of these methods (advantages, disadvantages) in their practical usage are considered. The analysis of comparison of computation and experimental data concerning the wave processes shows that the proposed computational technique, based on the analytical solution to the wave problem considered, simplifies the computation and saves considerably the computer time as compared with the numerical method. This technique can be used successfully in a number of cases for short-term prediction of wave heights with the adequate accuracy in the engineering practice.

Keywords: reservoir, waves, landslide, computational techniques.

59
DETERMINATION OF THE STREAM TRAJECTORY AT BREAKING OF THE OIL MAIN TRAVERSING THE RIVER BOTTOM IN THE CASE OF A VERTICAL INITIAL RATE

Namgaladze D.P. and Zhorzholiani G.A.

Georgian Technical University

There has been determined the stream trajectory at breaking of the oil main traversing the river bottom in the case of a vertical initial rate. The analytical relationship obtained for the stream trajectory allows considering further environment protection measures.

Keywords: oil main, breakdown, environment protection.

60
DETERMINATION OF THE AXIS LENGTH OF THE STREAM RUNNING OUT OF THE OIL MAIN LAID ON THE RIVER BOTTOM

Zhorzholiani G.A.

Georgian Technical University

There has been determined the axis length of the stream running out of the oil main laid on the river bottom. The solution was obtained for the straightened diagram of local rates. For other law of distribution of the local rates, a numerical method is proposed. The obtained results provide prerequisites for further environment protection measures.

Keywords: oil main, breakdown, environment protection.