SUMMARY
SEMIMARTINGAL MODEL OF INCOMPLETE FINANCIAL MARKET: THE PROBLEM OF ROBUST HEDGING OF FINANCIAL OBLIGATION
Meladze G.A.
Georgian
Technical University
The model of incomplete financial market is introduced. For the misspecified model, a problem of robust hedging is posed. The posed problem is further reduced to a more convenient optimization problem.
Keywords: robust mean-variance hedging, incomplete
financial market, misspecified model
CHARACTERIZATION OF THE VARIANCE OPTIMAL EQUIVALENT LOCAL
MARTINGALE MEASURE
Meladze G.A.
Georgian Technical University
Characterization of the variance-optimal
equivalent local martingale measure (ELMM) in terms of triangle brackets of the
corresponding martingales is presented.
Keywords: variance-optimal ELMM, density process, Dolean's exponent, characterization.
ON THE SOLUTION TO A MODEL PROBLEM OF MULTIPLE
LIGHT SCATTERING IN GASEOUS MEDIA
Sharashidze N.G.
Georgian Technical University
A
model equation of multiple light scattering in gaseous media is considered. The
class of its solution has been formed.
Keywords: light scattering, gaseous medium, mathematical model, characteristic equation.
FORMATION OF THE GREEN FUNCTION FOR
A MODEL PROBLEM OF MULTIPLE LIGHT SCATTERING IN GASEOUS MEDIA
Sharashidze N.G. and Shulaia D.A.
Georgian Technical University
There has been formed the
Green function for a model problem of multiple light scattering in gaseous
media with the help of elementary solutions to a homogeneous transport
equation.
Keywords: light scattering, gaseous medium, Green
function.
5
THE EFFECT OF SOLAR
WIND VISCOSITY IN POLAR CUSPS
Kereselidze Z.A. and
Zhonzholadze N.I.
M.Nodia Institute of
Geophysics
I.Gogebashvili Telavi
State University
In the vicinity of the hydrodynamic boundary
layer, there was estimated the value of the viscous friction force in polar
cusps of the magnetosphere of the Earth approximated by a funnel-shaped
asymmetric body. It is shown that specific features of the plasma flow in the
polar cusps can cause a significant viscous effect, which may affect the process of penetration of charged
solar wind ions into the polar ionosphere.
Keywords: magnetosphere, solar wind, viscous friction,
polar cusp.
PLASMA – EMISSION
SPECTROSCOPY OF FLASH – DESORPTION: ENERGY OF
DNA HYDRATION
Bregadze V.G., Khutsishvili I.G., Chkhaberidze J.G.,
Mchedlishvili E.Z. and Sologashvili K.G.
E.Andronikashvili Institute of Physics
There is proposed the method employing VHF
(110 MHz) inductively coupled plasma of reduced pressure as an optical light
source in the atomic emission analysis for investigation of water desorption
from the Na DNA samples humidified at different relative humidity. The energy
of the Na DNA hydration was studied in the isothermal and flash-desorption
regimes. The activation energy calculated in the flash-desorption regime at
T=273K, appeared to the equal to 19.5 kcal/mole water. This value is in good
agreement with the value of 21.4 kcal/mole calculated from the isothermal
kinetic curve of desorptrion at T=293K.
Keywords: flash-desorption, plasma emission
spectrometry, DNA hydration.
ON THE THEORY OF UDA-YAGI'S ANTENNA
Kotetshvili K.V.
Georgian Technical University
A
new approximated theory of Uda-Yagi's antenna is suggested. The values of axial
currents at the surface of each antenna vibrator have been found in an
analytical form. It is shown that, at h/λ > 1, the passive
vibrator currents are proportional to the active vibrator current. The
directivity diagram is given in an explicit analytical form.
Keywords: Uda-Yagi's antenna, directivity diagram,
integral equation.
CONFIGURATION OF
ASSEMBLY SYSTEMS BY TELEOPERATION
AND VIRTUAL REALITY
Rolf D. Schraft, Claus Kuhn and Markus
Mersinger
Fraunhofer-Institute for Manufacturing
Engineering and Automation IPA,
Stuttgart, Germany
It is the aim to modify and optimise assembly
processes during operation based on the subjective process and procedure
knowledge of the operator. This is done by an interactive man-machine-interface
(MMI) which is adapted to humans in an ideal way. This interface is based on an
intelligent data structure which connects the different layers of activity e.g.
product, process and machine parameters. The interactive user interface is
based on visual, audio and haptic components which allow an intuitive and
useful interaction with the robot that conducts the assembly process. The
acquired process data out of the real machine are sent back to the interactive
MMI and are used for the subjective configuration process in the constant
running optimisation procedure.
Keywords: teleoperation, virtual reality, data
architecture, simulation, assembly technology, robotics.
ON THE MODEL OF A QUEUEING SYSTEM
Khocholava V.V. and Mikadze I.S.
Georgian Technical University
Here
is considered a queueing system with an unreliable servicing system of a more
general structure than it is known from literature. The virtual delay time has
been determined. The proposed model can be generalized for the cases of
operating multichannel queueing systems
with a common queue and resources or for the cases when all the channels are
united for servicing multiple requirements of a single demand. It can also be
used for functional servicing of the system in the mode of redundancy of
various types with any method of controlling the system serviceability
(periodic, continuous, combined etc.) with consideration of various rules of
reservicing the demands interrupted by the system failure (reservicing from the
beginning, recervicing from the moment of interruption etc.).
Keywords: queueing system, model, reliability.
ON THE PROBLEM OF DETERMINING THE TIME OF MESSAGING
VIA AN UNRELIABLE COMMUNICATION CHANNEL
Khocholava V.V.
Georgian Technical University
Here
is considered a model of unreliable messaging via a communication channel when
the time of batch transfer is distributed by the arbitrary law and the time interval
between two neighbouring failures is distributed by the hyperexponential law.
The optimum number of repeated transfers after failures was determined.
Keywords: communication channel, data transfer,
reliability.
ON THE PROBLEM OF UNIT SERVICING OPTIMIZATION
Zautashvili I.Z.
Georgian Technical
University
The reliability model of an engineering system is considered. The system
is subjected to two types of failures: random failures detected by operative continuous
control at the moment of their occurrence and gradual failures – detected by
periodic control. The first-type failures are distributed by the Poisson law
and the second – type ones – by the
hyperexponential law.
Keywords:
reliability, failure, recovery, control.
ON THE PROBLEM OF
DETERMINATION OF THE TECHNICAL UTILIZATION FACTOR OF PLANTS SUBJECTED TO
DIFFERENT FAILURES
Zautashvili I.Z.
Georgian Technical University
The reliability model of an engineering
system is considered. The system is subjected to two types of failures: random
failures detected by operative continuous control at the moment of their
occurrence and gradual failures - detected by periodic control. The first -
type failures are distributed by the Poisson law and the second - type ones -
by the Erlang law.
Keywords: reliability, failure, recovery,
control.
ON THE THEORY OF A SIMPLE PANEL ANTENNA
Dzagnidze T.I. and Kotetishvili K.V.
Georgian
Technical University
A new investigation of electrodynamic
properties of the simple panel antenna is presented. The antenna directivity
pattern has been calculated.
Keywords: panel antenna, integral equation, directivity pattern.
INVESTIGATION OF
SPECIALLY ORIENTED SECOND-ORDER ASYMMETRIC COMPOSITION DESIGNS CLOSE TO
ORTHOGONAL ONES FOR TWO VARIABLES AT
ERROR OCCURENCE
Beraia N.O.
The second-order asymmetric composition designs close to orthogonal ones for two variables at experiment error occurence were studied. The design configuration distortion was carried out by addition, to the coordinates of design points distributed by a normal law, of such arbitrary numbers which correspond to the 1% and 5% accuracy of measuring instrumentation used for determination of factor levels.
Keywords: experiment design, asymmetric composition designs, error.
THE PROPERTIES OF SCHOTTKY DIODES OBTAINED BY
ELECTROCHEMICAL DEPOSITION OF AL ON SEMICONDUCTORS
Laperashvili T.A. and Khachidze M.G.
Institute of
Cybernetics
Iv. Javakhishvili
Tbilisi State University
There have been investigated the volt-ampere and voltage-capacitance characteristics of Schottky diodes (SD) obtained by electrochemical deposition of Al from aqueous solution of AlCl3 on semiconductors A3B5 (GaP, GaAs). There is shown, for the first time, that the semilogarithmic graph of the volt-ampere characteristic of the Al-GaP Schottky diode is a broken line with different indices of ideality. This can be explained by the change in the mechanism of current carrier passage caused by the complex structure of the semiconductor conduction band.
Keywords:
Schottky diodes, electro-chemical deposition, electric characteristics.
16
ON APPLICATION OF TOPOLOGICAL TRANSFORMATIONS WITH A CYLINDRICAL SURFACE
OF REFRACTION IN DESCRIPTIVE GEOMETRY
Khatiskatsi I.E., Nikvashvili N.K., Gurtskaia P.A. and Kvirikashvili
T.G.
Georgian Technical University
Application of topological transformations for
solving the problems of descriptive geometry is illustrated by the example of
one particular problem.
Keywords: topological
transformations, cylindrical surface of refraction.
ON APPLICATION OF TOPOLOGICAL
TRANSFORMATIONS WITH A CONICAL SURFACE OF REFRACTION IN DESCRIPTIVE GEOMETRY
Khatiskatsi I.E., Gurtskaia P.A., Nikvashvili N.K. and Kvirikashvili T.G.
Georgian Technical
University
Application of topological transformations
for solving the problems of descriptive geometry is illustrated by the example
of one particular problem.
Keywords: topological transformations, conical surface of refraction.
ANALYTICAL SOLUTION TO THE
EQUATIONS OF THE MATHEMATICAL MODEL DESCRIBING UNSTEADY
MODES IN HYDRODYNAMIC SYSTEMS
Gogua T.L.
Georgian Technical
University
The analytical solution to the
equations of the mathematical model of
controlling the unsteady mode in hydrodynamic systems is considered. By
the method of superposition, the equation
in private derivatives was solved and
the expression for the disturbance function was found analytically.
Keywords: hydrodynamic
systems, unsteady mode, mathematical
model.
ONE-STAGE SMALL-SCALE BIOGAS REACTOR -
EASY IN OPERATION AND SIMPLE IN SERVICE
Partskhaladze G.Sh., Chkhaidze B.Sh., Dudauri
T.V., Chachkhiani M.T. and Tsiklauri
L.N.
Georgian National Centre of High Technology
The optimum design of a biogas reactor,
which includes biomass charge and discharge devices, a biomass mixer, a biogas outlet
system, an autonomous heating system working on both biogas and exhaust heat of
the engine and a unit for utilization of waste heat of the heating system has
been developed, constructed and tested both on laboratory and pilot scales.
Three pilot biogas reactors were
implemented at different farms in Georgia. The results show that the developed
design of a bioreactor maintains optimal conditions for intense production of
biogas. The offered biogas reactor is easy in operation and simple in service.
Keywords: biogas, small-scale reactor, anaerobic digestion.
LOW-POWER ENGINE GENERATOR OPERATING ON BIOGAS
Partskhaladze G.Sh., Berezhiani
M.G., Chkhaidze B.Sh. and Dudauri T.V.
Georgian National Centre of High Technology
The initial parameters of 0.5-2 kW
power Otto cycle engines operating on petrol were retest. Results showed that
real power of engine is by 8% less then certified. This could be caused by low
quality of petrol imported in Georgia. The aim of experiments and test-design
works was adaptation of internal combustion system of petrol engine to biogas.
The carburettor for operating the engine on biogas was developed. System for
precleaning of biogas and the unit for supply of engine with biogas was also
developed, constructed and tested. As a result design papers for reconstruction
of small power engine have been done. Three low power engines have been
reconstructed to biogas and tested at lab and pilot scale as well. Results
showed that petrol engine reconstructed to biogas preserves 85% of its initial
power.
Keywords: biogas, Otto cycle engine, carburettor, starter.
LEVELS OF HIERARCHY OF MATHEMATICAL MODELING
Lashkhi A.A., Kakubava R.V. and Kupatadze T.G.
Georgian Technical University
Levels of hierarchy of mathematical modeling are
considered. The modeling process is subdivided into 4 stages, and the
investigation of phenomena with the help of a mathematical model - into 4
levels of hierarchy. At the low, medium and high levels of hierarchy, the
models of complex system elements are generally obtained by analytical methods.
However, when modeling the elements of the highest complexity, they are not
always suitable. In this case, they use the experimental method of modeling
which is based on the mathematical method of experimental design and the
regressive analysis.
Keywords: mathematical modeling, levels of hierarchy.
THE PROBLEM OF ANALYZING
AND MODELING THE HIGH-CAPACITY COMPUTER AND TELECOMMUNICATION SYSTEMS IN
GEORGIA
Kakubava R.V.,
Lashkhi A.A., Kupatadze T.G., Kupatadze D.T. and Koplatadze M.R.
Georgian Technical
University
There are described the aims and expected results of the project on the
development of the methods for analysis, modeling and optimization of
high-capacity computer and telecommunication systems and their application in
Georgia.
Keywords: computer systems, telecommunication,
modeling,analysis.
ANALYSIS, MODELING
AND OPTIMIZATION OF MODERN TELECOMMUNICATION SYSTEMS
Lashkhi A.A.,
Kakubava R.V., Kupatadze T.G., Koplatadze M.R. and Kupatadze D.T.
Georgian Technical
University
The problems of analysis, modeling and optimization of modern computer and telecommunication systems (CTS) are considered. The system analysis of information flows in bandwidth integrated-service digital networks (B-ISDN) and cellular communication networks is presented.
Keywords:
telecommunication systems, modeling, optimization, analysis.
GAME IMITATIVE EXPERIMENTS IN MODELS OF ORGANIZATIONAL SYSTEMS
Javakhadze G.S.
V. Trapeznikov Institute of Management Problems, Moscow
Organization and application of imitative games and imitative experiments in models of active systems are considered.
Keywords: organization of systems, imitative games,
experiments.
APPLICATION
OF LINEAR CODES IN MODERN FIBER-OPTIC TRANSMISSION SYSTEMS
Svanidze
G.R., Svanidze R.G. and Devsurashvili N.K.
Georgian
Technical University
The classification of modern fiber-optic systems of multiplexing is proposed.
It is shown that modern fiber-optic transmission systems are constructed basing
on the combination of technologies PDH-TDM, SDH/SONET and WDM/DBDM with
application of typical equipment STM-N. The basic units of the latter are
linear coders/decoders.
Keywords: fiber-optic transmission systems, multiplexing, linear codes.
ON SOME ASPECTS OF DESIGNING THE DIGITAL
CONTROL UNITS OF ELECTRIC SERVO SYSTEMS
Vachiberidze G.D., Chkhenkeli A.L. and
Kacheishvili N.V.
Research Institute of Automatics and Ñomputer Engineering.
The principles of designing the digital control units
of electric servo systems are considered. There has been developed a control
unit with strict logic, which operates effectively in the shipboard aerial guidance and stabilization system.
Keywords: servo systems, digital control units,
designing.
METHODS AND EQUIPMENT
FOR INCREASING THE RELIABILITY OF THE SHIPBOARD AERIAL GUIDANCE AND STABILIZATION
SYSTEM
Vachiberidze G.D.,
Chkhenkeli A.L. and Kacheishvili N.V.
Research Institute of
Automatics and Computer Engineering
To meet the requirements of high reliability, limited
time of the equipment readiness to operation and rapid search for a fault by
test control, there was developed control equipment. The state tests carried
out on board a ship under real conditions justified high reliability of the
system.
Keywords: shipboard aerial system, guidance, stabilization, control equipment.
ELECTRIC POWER SYSTEM OPTIMUM MODE AND SELECTION OF THE
OPTIMUM STRUCTURE OF POWER STATION UNITS
Laoshvili D.P.,
Chunashvili B.M. and Kokhreidze G.K.
Georgian
Technical University
There are
suggested the methods of determining the optimum structures of electric power
units at each rated interval of the electric power system operation period and
such load distribution among them that should provide realization of all the
restrictions in view of reliability and minimum costs.
Keywords: electric power system, power station units,
optimum mode, load distribution, methods.
POSITIVE INERTIA – A PROPERTY OF AN
ELECTROMAGNETIC FIELD
Summary of the Works Published in 1983-2003
Aburjania A.N., Museliani G.T., Gelashvili D.A.
and Aburjania L.A.
Georgian Technical University
It was established
that positive inertia is a property of an electromagnetic field. Dual nature of
the electromagnetic inertia is a physical basis for field propagation and
energy transfer. The solutions to basic practical problems of the theory of
inductively coupled electric circuits are suggested.
Keywords: electromagnetic field, positive inertia, inductively coupled electric circuits.
ABOUT
MUTUAL-INDUCTIVELY COUPLED CIRCUITS
Museliani T.G.
Georgian Technical
University
Basing on the argeement between the
theoretical and practical calculations, there is proposed a rule of formulating
the set of equations for inductively coupled circuits. The rule is based
simultaneously on Faraday's law of electromagnetic induction, Lenz's law and
Ampere's rule, and on the notion and marking of like terminals. The set of
equations formulated according to this rule really represents the physical
processes proceeding in inductively coupled circuits.
Keywords: inductively coupled circuits, physical
processes, set of equations, rule of formulation, like terminals.
MATHEMATICAL MODEL OF
CONTROLLING THE UNSTEADY MODE IN HYDRODYNAMIC
SYSTEMS
Namgaladze D.P. and Gogua
T.L.
Georgian Technical
University
A mathematical model of controlling the unsteady mode in
hydrodynamic systems ispresented. In particular, the oscillation mode in
long pipelines is considered. The control is performed with the help of the
generator of disturbances, the presence of which is taken into
account in the equations with the help of the Dirac 
-function. The boundary conditions have been established.
Keywords: hydrodynamic
systems, unsteady mode, control, mathematical model.
ANALYSIS, CALCULATION
AND GRAPHICAL-GEOMETRIC MODELING OF TEABUSH TRIMMERS
Gabunia N.A. and
Khomasuridze B.S.
Georgian Technical
University
The problems of analysis, calculation and graphical-geometric modeling of teabush trimmers of various types are considered.
Keywords: teabush trimmer, graphic-geometric modeling.
ABOUT POWER INDEXES OF TEABUSH TRIMMERS
Gabunia N.A. and Khomasuridze B.S.
Georgian Technical University
There was
developed and tested a device for trimming teabushes at the height of 35-70 cm
with the aim to raise the crop yield, to facilitate the sprout formation and to
grow a standard teabush. The trimmer is controlled by a hydraulic device. The
tests showed that power indexes of the trimmer had improved (by 25% at idle
run, and by 21% - in operation).
Keywords: teabush trimmer, power indexes.
METHODS OF CALCULATING THE
TENSION OF AERIAL SKIDDER CARRYING ROPES
Chalaganidze Sh.I. and Kokaia G.G.
Georgian Technical University
There are proposed the methods for
calculation of the tension of aerial skidder carrying ropes. The methods
provide determination of maximum and erecting tensions within the permissible
deviation limits. The nomogram constructed by these methods allows one to find
the desired diameter of the carrying rope easily and rapidly.
Keywords: aerial skidder, carrying ropes, tension,
calculation.
DEVELOPMENT OF THE DEVICES FOR
REDUCING THE AERODYNAMIC DRAG OF A VEHICLE AND METHODS OF ESTIMATION OF THEIR
EFFECT ON ROAD SAFETY
Kharitonashvili V.A.
and Tsintsadze Z.Z.
Georgian Technical
University
The problems of reducing the aerodynamic drag of vehicles
are considered. The necessity in designing the fairings is justified. The
methods of estimation of their effect on road safety are presented.
Keywords:
vehicle, road safety, aerodynamic drag, fairing, brake system.
THE EFFECT OF THE BRAKING SIGNAL ON VEHICLE SAFETY
Kharitonashvili V.A. and Tsintsadze
Z.Z.
Georgian Technical University
There have been investigated the braking process of a truck and the effect of braking signals on active vehicle safety. The necessity in improving the switching circuit of the braking signal sensor is justified.
Keywords:
vehicle, braking signal, road safety.
ON THE PROBLEM OF DETERMINATION OF THE TRAFFIC FLOW
SATURATION AT REGULATED CROSSROADS
Sisvadze G.P. and Bogvelishvili Z.V.
Georgian Technical University
With consideration of the importance of traffic flow saturation at
regulation by traffic lights and nonavailability of a unified approach to its
determination, there was carried out theoretical and experimental
investigations with the aim to define more exactly the quantitative and
qualitative aspects of this problem.
Keywords: traffic, flow saturation, regulated crossroads.
ANALYSIS OF THE PARAMETERS OF TUNABLE IR LASERS FOR MEDICAL DIAGNOSTICS
Davarashvili I.O., Enukashvili M.I., Kekelidze N.P., Emekli N., Yarat A., Emekli E. and Tecer L.
Iv. Javakhishvili Tbilisi State University
Marmara University, Istanbul, Turkey
Karaelmas University, Zonguldak, Turkey
For achievement of
high sensitivity and selectivity in the process of recording different
components of human exhalation, the tunability, power and resolution of
IR lasers are analysed.
Keywords: tunable
IR laser, medical diagnostics, human exhalation.
ON SOME ASPECTS OF VIRUSOLOGICAL WATER CONTROL
Klimiashvili L.D., Tsikhelashvili I.Z. and Nikolaishvili
M.S.
Georgian Technical University
There
are considered some aspects of virusological water control by traditional
methods in comparison with modern developing methods of scanning tunnel and
atomic-force microscopy for investigation of various biological objects, in the
first place, of viruses in water directly.
Keywords: water, viruses, control, methods.
THEORETICAL INVESTIGATION OF
KREBS' CYCLE WITHIN THE SCOPE
OF ALGEBRAIC CHEMISTRY
Tsaguria E.N., Gverdtsiteli M.I. and Gakhokidze A.R.
Iv.
Javakhishvili Tbilisi State University
Within
the scope of algebraic chemistry (quasi-ANB-matrices method), theoretical
investigation of reactions of Krebs' cycle has been carried out.
Keywords: Krebs' cycle,
quasi-ANB-matrices method.
SYNTHESIS AND ANION EXCHANGE IN ALKOXYLMETHYLENE
TRIPHENYLARSONIUM BROMIDE
Amirkhanashvili D.G., Gigauri R.D., Amirkhanashvili N.G.
and Gigauri D.A.
Iv. Javakhishvili Tbilisi State
University
The individuality and ionic structure of the product
of alkylation of triphenylarsine with bromacetic acid are confirmed by the
methods of chemical analysis, IR spectroscopy and the data on the molar
electric conductivity in diluted dimethylformamide solution. It is shown that
synthesized carboxylmethylene triphenylarsonium bromide is an excellent initial
substance of obtaining both relatively simple and cationic-anionic coordination
compounds. On its base, with the help of a double exchange reaction, there were
obtained carboxylmethylene triphenylarsonium nitrate, tetraidozincate and
cadmoate.
Keywords: alkoxylmethylene triphenylarsonium bromide,
synthesis, anion exchange, properties.
INVESTIGATION
OF THE KINETICS OF REESTERIFICATION OF TRIISOAMYL ARSENITE WITH ETHYLENE GLYCOL
Sulaberidze K.T., Dzotsenidze Z.G., Bezarashvili G.S., Gigauri R.D., Kobaladze R.G., Machavariani D.N. and Petviashvili D.T.
Iv. Javakhishvili Tbilisi State
University
The kinetics of the reaction between
triisoamyl arsenite and ethylene glycol at significant excess of ether was
studied. The kinetic order and activation energy of the process were
determined: the reaction order was equal to 2 and the activation energy - to
37.2 kJ/mole. The kinetic equation was numerically solved using Euler's method.
Keywords: triisoamyl arsenite, ethylene glycol,
reesterification, kinetics.
SYNTHESIS AND
INVESTIGATION OF IODOMETHYLENEALKYL(ARYL) ARSONIUM TETRAFLUOROBORATES(III)
Gigauri R.D., Arabuli
L.G. and Gigauri R.I.
Iv.Javakhishvili
Tbilisi State University
The
reaction between iodomethylenealkyl(aryl) arsonium iodides and potassium
tetrafluoroborate(III) was studied. The experiments were carried out in water-spirit
solutions at room temperature. There was synthesized iodomethylenebutyl
arsoniumtetrafluoroborate(III) and other tetrafluoroborates of quarterly
arsonium. The possibility of quantitative determination of total concentration
of fluoride and iodide in one sample is theoretically justified. The structures
of the substances under investigation were determined by physical and chemical
methods.
Keywords:
tetrafluoroborates, iodomethylenealkyl arsonium, synthesis, investigation.
OXIDATION OF IODOUS
IODOMETHYLENEALCYL(ARIL) ARSONIUM WITH CASEOUS CHLORINE
Gigauri R.D., Arabuli L.G. and Amirkhanashvili
D.G.
Iv. Javakhishvili Tbilisi State University
The reaction of oxidation of iodous iodomethylenealcyl(aryl) arsonium
with gaseous chlorine in ethanol solutions at room temperature has been
studied. It is shown, that, as a result, there are precipiated tetrachloroiodites(III)
of composition R2As(R')CH2I]I [ICl4], where
R=R' or R≠R'. The composition and structure of the synthesized
cationic-anionic complexes were determined by physical and chemical methods.
Keywords:
iodous iodomethylenealcyl(aryl) arsonium, gaseous chlorine, oxidation,
investigation.
QUANTITATIVE DETERMINATION OF ARSENIC AND
BORON AT THEIR JOINT PRESENCE IN COMPOUNDS
Abrbuli L.G., Jioshvili G.D., Gigauri R.I. and Gigauri R.D.
Iv. Javakhishvili Tbilisi State University
A new approach to
quantitative determination of arsenic and boron at their joint presence in
compounds has been developed. The procedure of determining arsenic and boron in
cationic-anionic coordination compounds is presented. It is considered that
these elements can be sucessfully determined in other compounds as well.
Keywords: arsenic,
boron, joint presence, quantitative determination.
PRODUCTION OF INITIAL MATERIALS FOR THE SYNTHESIS OF
4-HYDROXYCUMARIN
Buzariashvili M.S., Chedia R.V.,
Tsitsagi M.V., Mikadze I.I. and Dolidze A.V.
P. Melikishvili Institute of
Physical and Organic Chemistry
For the synthesis
of 4-hydroxycumarin, which is an intermediate compound for production of a
large number of biologically active substances, there was chosen a scheme based
on the usage of salicylic acid as an initial compound with following
esterification and formation of its methyl ether. By acetylation of the latter,
methyl ether of acetylsalicylic acid, which is the key compound for the synthesis
of 4-hydroxycumarin, is produced.
Keywords: synthesis, 4-hydroxycumarin, salicylic acid,
methyl ether, acetylsalicylic acid.
A METHOD OF QUANTITATIVE DETERMINATION OF FLAVONES AND
FLAVONOLS
Gamtsemlidze E.G., Targamadze I.L. and Shalashvili A.G.
S. Durmishidze Institute of Biochemistry and
Biotechnology
Georgian State Agrarian University
There has been developed a method for quantitative determination of flavonoid glycosides of isorhoiphonin (7-0-rutinoside apigenin), scolimoside (7-0 rutinoside luteoline), and rutin (3-0 rutinoside quartzetin). The method involved paper chromatography with the mean relative error 4.5 - 5.5%.
Keywords: flavonoides, quantitative determination.
DEVELOPMENT
AND APPLICATION OF MINERAL FERTILIZER ON THE BASIS OF THE OXIDANT OF LIQUID
ROCKET PROPELLANT
Dolidze
A.V., Tsanava V.P., Zhgenti M.S. and Mikadze I.I.
P.
Melikishvili Institute of Physical and Organic Chemistry
Georgian Research
Institute of Tea, Subtropical Cultures and Tea Industry
There has
been developed and realized the procedure of utilization of the sub-standard
oxidant of liquid rocket propellant Melange. The procedure includes preliminary
dilution of the oxidant in water with following neutralization of hydrated lime
with aqueous solution. As a result, liquid mineral fertilizer, so-called
Norvegian niter, with optimum nitrogen concentration of 8-10% is formed. The
obtained calcium niter allowed optimizing the acidity of the subtropical zone
soil (pH 2-3) to pH 5.5-6. The composition with peat allowed increasing the
additional fertilization efficiency due to the application of the complex
organic-mineral fertilizer.
Keywords: rocket propellant, oxidant,
utilization, calcium niter, organic-mineral fertilizer.
EVALUATION OF THE OXIDATION
PARAMETERS OF CHROMIA- AND ALUMINA- FORMING HEAT- RESISTANT ALLOYS
Kvatadze Z.A.,
Maisuradze N.I., Mikadze O.I. and Bulia B.P.
Georgian
Technical University
F.Tavadze
Institute of Metallurgy and Materials Science
A net-projection numerical method is suggested for
solution of the empirical equation which quantitatively describes mass
transport processes with the decreasing effective diffusion area of chromia-
and alumina- forming scales.
Keywords: oxidation kinetics, net-projection numerical
method, chromia, alumina.
PHYSICAL AND CHEMICAL
CHARACTERISTICS AND FRACTION COMPOSITION OF THE OIL OF TARIBANI DEPOSIT
(GEORGIA)
Gamezardashvili D.Z.,
Areshidze G.Kh., Beraia G.O. and Gadzhiev-Shengelia M.K.
P. Melikishvili
Institute of Physical and Organic Chemistry
"Saknavtobi"
National Oil Company
The crude oil of Taribani Deposit, Georgia, has
been studied on modern instrumental level. The basic standard physical and
chemical characteristics were determined. The fraction composition (with the
accuracy of ±1 wt. %) was investigated by gas chromatography.
Keywords: oil, composition, physical and chemical
characteristics, investigation.
INVESTIGATION
OF AROMATIC COMPONENTS IN KAKHETIAN-TYPE WINE
Tamarashvili D.E., Gotsiridze
O.G., Sirbiladze A.L., Khositashvili M.I. and Asashvili T.Sh.
Research Institute of Horticulture, Viticulture and
Wine-Making
There has been studied the concentration of terpene compounds in the wines produced from the Rkatsiteli grapes by European and Kakhetian technologies. It was established that the European-type material contained less terpene compounds than the Kakhetian-type one (8.6 mg/dm3 and 12.5 mg/dm3, respectively). This is due to the fact that the grape juice and wine material stayed with the pomace for a long time according to the Kakhetian technology.
Keywords: wine, aromatic components.
RESULTS OF THE INVESTIGATION OF PRODUCTION RESERVES OF DYES AND TANNINS IN GEORGIAN GRAPES
Ebelashvili N.V.
Research Institute of Horticulture, Viticulture and Wine-Making
Here are presented the results of the investigation of production reserves of dyes and tannins both in Georgian sorts of grapes such as Saperavi, Tavkveri, Asuretuli Shavi and Shavkapito and in their fresh-pressed pomace, which is a residual raw material in production of pink table and liqueur wines. It was established that the production reserves of dyes and tannins in the abovementioned grape sorts vary over a wide range depending on the grape sort and the region of growing (tannins varied from 2.5 to 5.89 g/dm3, and dyes - from 540 to 2340 mg/dm3. The production reserves of tannins and dyes are also rather high in the fresh-pressed pomace of the mentioned grape sorts (1.22-2.58 g/dm3 and 235-1040 mg/dm3, respectively).
Keywords:
Georgian grapes, pomace, dyes, tannins, production reserve.
WINE MATERIALS FOR SPARKLING AND CARBONATED WINES
Ebelashvili N.V.
Research Institute of Horticulture, Viticulture and Wine-Making
The
possibility of production of wine materials for sparkling and carbonated pink
wines from freshly pressed pomace of Tavkveri red grape and white grape must is
demonstrated. To produce the wine materials, the mixture of the runoff and
first press of the white grape is added to the freshly pressed pomace of
Tavkveri red wine during boiling fermentation. The amount of the mixture is
determined by the volume of the must pressed from the abovementioned pomace. It
has been established that, for controlling the optimum concentration of
anthocyans in pink wine materials, the ratio (by volume) between the white
grape must and the must pressed from the Tavkveri pomace is 2:1.
Keywords: pink wines, wine materials, pomace, phenolic compounds, production process.
ESTABLISHMENT OF OPTIMUM CONDITIONS FOR THE EXTRACTIVE
SUBSTANCE YIELD FROM SOME WILD-GROWING BERRIES
Bagashvili I.B. and Mujiri L.A.
Research Institute of Horticulture, Viticulture and
Wine-Making
Some
wild-growing berries were studied with the aim to establish optimum conditions
for the yield of extractive substances. The berries studied were elder,
bilberry, snowball, red currant, raspberry, blackberry and rowanberry. The
samples were treated with the 40-70% spirit solution for 8-20 days. It was
established that the optimum time for the yield of extractive substances was
15-20 days.
Keywords: wild-growing berries, extractive substances,
yield, conditions.
A
SYSTEMIC APPROACH TO THE STUDY OF INFORMATIVE POTENTIAL
OF WORD-CONCEPTS IN LITERARY TEXTS
Jokhadze L.E.
Iv. Javakhishvili Tbilisi State University
This
article deals with a systemic method to formalize semantic transformations of a
polysemic word from infinitude to a full-fledged cognitive concept in literary
texts. This allows us to make in-depth analyses of creating a stylistic effect
of polysemy in speech and evaluate its aesthetic-cognitive function. The
proposed ways of analysis and the study of informative potential (IP) of
polysemic word is viewed from the text-analyst’s standpoint and consequently
the ways of calculations might be modified and varied in reference to the
sensory perception of the reader-receptor and his/her subjective attitude
(emotional state, thesaurus, language competency, intellectual abilities,
etc.).
Keywords: word-concepts, informative potential,
self-governing system, stochastic choice, dynamic hierarchical multi-luvel
system, stratified phased model, average entrophy.
ASYMPTOTICS OF SOME PRIME NUMBERS
Bulia N.P.
Georgian Technical University
Asymptotics of some prime numbers is considered. This paper is a sequel
of the author's works published earlier which dealt with the properties of
quasi-regular and quasi-irregular numbers.
Keywords: prime
numbers, asymptotics, quasi-regular numbers, quasi-irregular numbers.
DEGREE OF TETRAGONALITY OF THE TlInSe2
CRYSTALS
Gegiadze G.G., Davarashvili O.I., Enukashvili M.I.,
Kekelidze N.P., Mamedov T.S. and Tanoglu M.
Iv. Javakhishvili Tbilisi State University
Institute of Physics NAS, Azerbaijan
Izmir Institute of Technology, Turkey
For
application of the TlInSe2 crystals as IR photodetectors, radiation
sensors and tenzoresistors, it is important to study the crystal structure,
particularly the degree of tetràgonality. By an X-ray diffractometer, lattice
constants a=8.062Å and c=6.851Å were measured and c/a=0.850
was defined.
Keywords: TlInSe2 crystals, tetràgonality,
lattice parameters.
HYDRAULIC PROBLEM OF RIVER AND
SOIL POLLUTION AT EMERGENCY BREAK OF THE MAIN PIPELINE AND PARABOLIC LOAD
Kekelidze T.I.
Georgian Technical University
The hydraulic
problem of river and soil pollution at emergency break of the main pipeline
isconsidered. The equations for determining the pressure curve and filtration flow
rate were derived analytically. Basing on the obtained results, the environment
protection measures were worked out.
Keyword: environment
protection, pollution, pipeline, break, parabolic load.
PHYSICAL MODEL OF THE EYE ACCOMMODATION MECHANISM
Karakozov K.G. and Chikhladze T.M.
Institute of Cybernetics
A physical model of the eye accommodation mechanism is described. In this model, the crystalline lens with transparent electrodes deposited on its spherical surfaces has inverse piezoelectricity.
Keywords: eye,
accommodation, model, inverse piezoelectricity.
A MOLD FOR SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS (SHS) IN VACUUM
Sakhvadze D.V., Tavadze G.F., Okrostsvaridze O.Sh., Khvadagiani A.A. and
Lekishvili K.M.
State
Military Scientific - Engineering Center "Delta"
The design of a mold for producing
hard-alloy materials by SHS compacting in vacuum is presented.
Keywords: self-propagating
high-temperature synthesis (SHS), compacting, vacuum, degassing, mold.
