**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, . . .
, 2*n* – 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**

**Kokilashvili L.G.**

** **

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****
**

**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 Ï 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 ^{11}B 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****
**

**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 TiCl_{3}
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 TiCl_{3}.

**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 MoCl_{5}-polymer-dissolvent was used. A possibility of a production of a-Mo_{2}C by low-temperature synthesis was
established using X-ray- and electron-diffraction methods.

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

**17****
**

**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 B_{2}O_{3} : 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 B_{2}O_{3} into B_{4}C makes up 93% at
1800 K and 98 % at 2400 K in the mixture of the stoichiometric composition (B_{2}O_{3} + 3.5C) and in
that of the excessive carbon content. For the boric anhydride-rich mixture (B_{2}O_{3}
+ 2C), the upper limit of a fractional conversion of B_{2}O_{3}
into B_{4}C 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 (B_{2}O_{3})_{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****
**

**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 CO_{2} as a gas carrier improves its adsorptive properties. This
liquid crystal phase can be used for separation of n-hydrocarbons, C_{6}-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 ~1000^{0}Ñ
for 8 hours. The obtined solid mass, enriched with silica and practically free
of oxides of the R_{2}O_{3 }type,
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****
**

**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****
**

**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 Cu_{2}O (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****
**

**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****
**

**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 BaSO_{4} suspension
were studied by optical microscopy and sedimentation methods. There was found
an original dependence of optical density of the BaSO_{4} suspension on
ethanol concentration (<1%), which can be explained by formation of
ethanol-water associates.

**Keywords:** organic
solvents, ethanol, BaSO_{4} suspension, optical density.

**31****
**

**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 As_{2}O_{3} with hexanol 1C_{6}H_{13}OH
under nonisothermic conditions was investigated. Basing on the experimental
data, the change in the As_{2}O_{3} 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****
**

**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****
**

**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-^{1}H spectroscopy are
presented. There was determined the content of hydrogen atoms in aromatic
structures, in groups CH_{3}, CH_{2} 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 - C_{1}-C_{2} maximum.

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

**37****
**

**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****
**

**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.**

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****
**

**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****
**

**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****
**

**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****
**

**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****
**

**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****
**

**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****
**

**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****
**

**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 Se_{2} 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.