SUMMARY
Summary
On the
critical thickness in AIVBVI heterostructures under
diffusion mismatch
Pashaev A.M., Davarashvili O.I.,
Aliyev V.A., Bychkova L.P., Enukashvili M.I. and Zlomanov V.P.
Iv.
Diffusion mismatch in AIVBVI heterostructures
at epitaxy temperature is formed due to the mutual diffusion of components of
the emitter and the active area. If the semiwidth of the mismatched region is
more than the critical thickness, the
probability of relaxation of the corresponding pressure is high. This raises
the threshold current in lasers, and, in
photodetectors, low sensitivity is realized. The effective maximum mismatch or
the effect caused by it can be reduced, on the one hand, by changing the
profile of the structures in heterostructures when they approach the emitter
and the active area and, on the other hand, by doping the active area with the
impurities expanding the limit of elasticity.
Keywords: heterostructures, diffusion mismatch, critical
thickness.
ELECTRICAL CHARACTERISTICS OF Fe/GaAs
STRUCTURES
Mikelashvili V.T., Kvitciani O.R., Laperashvili D. L. and
Abstract. The Fe/GaAs contact has attracted considerable
interest among researchers due to both its magnetic properties and the
insignificant lattice mismatch the between the metal and the semiconductor. The
formation of Schottky barrier and its characteristics, as well as of metallic
interconnections, are strongly influenced by the structure and the disorder of
the interface. The Schottky barrier was obtained by electrochemical deposition
of ferromagnetic metal - Fe on the electrochemically etched surface of GaAs. The
aqueous solution of iron chloride was used for deposition of Shottky contact. The
ohmic contact was made by sintering of metallic indium in hydrogen. Current-voltage
and capacitance-voltage characteristics of the obtained Schottky diode based on
the Fe/GaAs barier contact were studied. The results of investigation of the
current flow mechanism in the observed structures are presented.
Keywords: Fe/GaAs structure, ferromagnetic metal,
semiconductor, electrochemical deposition, Schottky barrier.
Summary
Hydrogen atom transfer from
aromatic amines to the molecules of electron acceptors in the
Kokrashvili T.A., Kvintradze V.I. and Tsirekidze M.A.
The
values of enthalpy, entropy and free energy of prototropic equilibrium in
nonrelaxation triplet exciplexes were obtained. It was established that, with
increasing temperature of the solution, the yield of neutral radicals
increased, while the yield of triplet exciplexes decreased. It is demonstrated
that polar triplet exciplexes are efficiently quenched by secondary aromatic
amines through the hydrogen atom transfer with the formation of corresponding
neutral radicals.
Keywords: triplet exciplexes,
triplet state, electron acceptors, electron transfer, hydrogen atom transfer.
Summary
kinetics of quenching of polar triplet exciplexes by
nitroxylic radicals
Kokrashvili
T.A., Tsirekidze M.A., Kvintradze V.I. and Pokleba A.K.
The constants of the rate of quenching of polar
triplet exciplexes by nitroxylic radicals were determined. It is demonstrated
that quenching of polar triplet exciplexes by radicals is efficiently performed
in the triplet complex of collision by accelerating the intercombination
transfer into the singlet exciplex located at a lower energy level.
Keywords: triplet exciplex, quenching, triplet state, nitroxylic radical.
Summary
The effect of magnetic field
on the kinetics of triplet exciplex destruction
Kokrashvili T.A., Kvintradze V.I. and Pokleba A.K.
The
effect of magnetic field on the ion-radical yield in the systems of the type of quinone-iodine-replaced aniline was
studied. It is shown that, in the solutions of medium polarity, the basic
contribution to the triplet exciplex destruction under study was made by the
process involving the triplet-singlet transitions at the expense of magnetic
electron-nuclear interaction.
Keywords: triplet exciplex,
kinetics, destruction, magnetic field, ion-radical pair.
SummarY
ON
strongly and weakly separable Fisher statistical structures
Aleksidze L.T., Zerakidze
Z.S. and Tsiklauri E.M.
Gori University
In the present paper,
we prove that weakly separable Fisher statistical structures are strongly
separable Fisher statistical structures, and orthogonal Fisher statistical
structures are strongly separable Fisher statistical structures.
Keywords: statistical structures, strong separation, weak
separation.
Summary
ON
the Construction OF Fisher statistical structures
Aleksidze L.T. and Zerakidze
Z.S.
Gori University
In the present paper, we construct Fisher orthogonal and weakly separable
Fisher statistical structures having maximum possible power.
Keywords: statistical structure, orthogonal structures, strong separation, weak
separation.
SUMMARY
A grid of subgroups and the
geometry hall is of W-power groups
Chabashvili M.Z. and Bokelavadze T.Z.
Iv. Javakhishvili Tbilisi State University
It
is demonstrated that the basic theory of affine geometry holds for Hall’s W-power
groups if W is a ring of principal ideals. Relevant examples are cited.
Keywords: affine geometry,
Hall groups, W-power groups, grid of subgroups, nilpotent groups.
INFLUENCE OF LITHIUM AND BORON DOPING ON
the SUPERCONDUCTING TRANSITION IN Bi-2223 Superconducting CERAMICS
Margiani
N.G., Zhghamadze V.V., Mzhavanadze I.A., Sabashvili N.G. and
Shurgaia
G.A.
Institute of Cybernetics
Abstract.
The influence of lithium and boron doping on the superconducting
transition was investigated in Bi-based
high-Tc 2223
ceramics. It was found that the Bi-2223 samples doped with Li and B transform into
the low-Tc Bi-2212 phase.
In the Li-doped Bi-2223 samples, a nonmonotonous change in the critical
temperature takes place, while the boron doping leads to the gradual decrease
in Tc with the
increasing dopant content.
Keywords:
superconducting ceramics, doping, superconducting transition.
INFLUENCE OF BORON DOPING ON the
RESISTIVE TRANSITION
IN Bi(Pb)-Sr-Ca-Cu-O GLASS CERAMICS
Margiani N.G., Papunashvili N.A.,
Shurgaia G.A. and Zhghamadze V.V.
Institute of Cybernetics
Abstract. The undoped and boron-doped Bi(Pb)-Sr-Ca-Cu-O
glass-ceramic samples with nominal composition Bi1.7Pb0.3Sr2Ca2Cu4BxOy
(x=0 and 0.3) were synthesized by
the melt-quenching method. Crystallization behavior and resistive transition of the prepared material
were examined. The addition of B2O3
to the Bi-based system suppresses the crystallization of the high-temperature
2223 phase and sharply decreases the critical temperature. The normal state
resistivity values of the boron-doped samples are an order of magnitude larger
than those of undoped ones.
Keywords: high-temperature superconductivity,
Bi(Pb)-Sr-Ca-Cu-O glass ceramics, resistive transition, boron doping.
PREDICTION
of the CORROSION RESISTANCE OF Ti-Ni-Cr ALLOY IN PHYSIOLOGICAL SOLUTION
Gozalishvili E.I., Mikaberidze M.P., Ramazashvili D.R., Akhvlediani
F.Tavadze Institute of Metallurgy and Materials Science
Abstract. The
prediction of long-term corrosive behavior of Ti-Ni-Cr alloy was carried out at
37oC in the physiological solution (0.9% NaCl) with application of
electrochemical and corrosion tests, spectral chemical analysis and statistical
methods of experimental data analysis. The obtained equation of time dependence
of the corrosion rate is expressed as C = 0.0038 exp (-0.045τ). The time
dependences of corrosion potentials and rates and the absence of pitting
corrosion allows forecasting the high corrosion resistance of alloy
corresponding to the passive state
during long-term exposure. The chemical spectral analysis confirmed the
calculated and predicted low values of corrosion rates and showed that, during
the long-term exposure, the quantity of
titanium ions passed the into solution could be neglected.
Keywords: corrosion
resistance, prediction, alloy, electrochemical calculation, passivity, potential,
corrosion rate.
SUMMARY
Zurab Bedia’s phenomenon
Prangishvili A.I., Tsivtsivadze T.I., Chavchanidze
V.V., Chigogidze N.Sh., Kveselava I.S., Skhiladze R.A., Gobechia G.G. and
Sulakvelidze G.A.
Georgian Engineering Academy
Georgian Technical University
The
article is devoted to Zurab Bedia – a unique phenomenon, who possesses a
powerful bioenergetic potential capable of lighting the electric bulbs of
different power. The historical experience of hushing up and hindering the
investigations of natural phenomena has been analyzed. It is justified that
such phenomena need thorough investigation in the interests of science and
human activities. The necessity in establishing and financing a specialized
laboratory for studying such phenomena and designing the special portable
instruments – analyzers of external fields of biological objects is emphasized.
Keywords: bioenergy,
phenomenon, biometer, solion-liquid elements.
SUMMARY
ON A PROCEDURE OF SOLVING THE EQUATION FOR DETERMINATION OF
THE CONTENT OF GAS
Telia T.N. and Chkhaidze D.T.
Batumi State University
The
percent content of dissociated co2
was determined by the method of successive approximations with the help
of Goal seek dialog window in MS Excel. The procedure of determination of
high-order roots was developed.
Keywords: carbon dioxide,
content, nonlinear equation, solution, procedure.
SUMMARY
A
METHOD OF OPTIMIZATION OF THE PARAMETERS OF CRANK MECHANISM
Telia
T.N.
Batumi
State University
A mathematical model of operation of the crank
mechanism was constructed in MS Excel. The proposed model provides the
automatic determination of optimal values of mechanism parameters satisfying
the given initial conditions.
Keywords: crank mechanism, mathematical model, mechanism parameters,
optimization.
SUMMARY
ON A MODEL OF DATA TRANSMISSION VIA THE
COMMUNICATION CHANNELS SUBJECT TO TRANSIENT FAILURES
Mikadze I.S. and Mayer A.A.
Georgian Teachnical University
The
problems of faultless data transmission via the channels subject to transient
external effects of random duration are discussed. The moments of emergence of
these effects are distributed by the Erlang law. It is assumed that the
duration of interfering factors and the methods of their elimination, as well
as the duration of shot transmission, are distributed by a random law. There
was obtained the generalized state for the probability of the message being
transmitted without distortion and for the given time.
Keywords: communication
channel, transient failure, data transmission, model.
Summary
On the efficiency of the Use of engineering
systems Subjected to failures
Mikadze
I.S. and Mayer A.A.
Georgian
Technical University
An original method of determination of the rate of use
of engineering systems which are covered with instrumental control incompletely
is proposed. The method takes into consideration the reliability of control
instruments, the time of reliable control at regular checks and the time of
recovery. The obtained results allow determining the optimal value of the
operating rate of the system just as with account for working costs, so without
regard for them.
Keywords: engineering systems, reliability, rate of use, instrumental control.
summary
TURBULENT LIQUID
FLOW IN A
CIRCULAR TUBE WITH
UNIFORM INJECTION THROUGH
POROUS WALLS
Tsutskiridze V.N.
Georgian Technical University
The
incompressible liquid flow in a porous-wall tube was calculated using a
three-parametric turbulence model. As a result of the calculations made, the
effect of injection on the distribution of averaged and pulsation
characteristics of motion over the tube section and length is defined.
Keywords: liquids, turbulent
flow, porous walls, injection.
SUMMARY
on the problem of correction of single errors in
linear code 3B4B
Nanobashvili
D.V. and Nanobashvili V.V.
Georgian
Technical University
There are considered the problems of correction of
single errors in linear code 3B4B. There are shown the possibilities of
enhancement of efficiency of the correction method, proposed by the authors
earlier, based on the detection not only of forbidden combinations but also of
partially false allowed ones in the linear signal. This method allows
correcting not 44% of errors, as it happens in the case of detection of only
forbidden combinations, but 63% of errors, which significantly improves the
quality characteristics of optical-fiber telecommunication systems.
Keywords: linear code 3B4B,
disparity, allowed combinations, forbidden combinations, errors, correction.
SUMMARY
INFORMATION STORES
IN THE BANKING SYSTEM
Petriashvili L.N.,
Kiknadze M.G. and
Gvaramia E.G.
Georgian
Technical University
The refinement
of the system
of processing, analysis
and representation of
information must be
organized on the
bases of knowledge
of concrete demands,
addressed information representation and
improvements in methodological tools
of analysis. The creation
of the systems of
operational standards of
the bank and
of decision-making is associated
with the formation of the information
store by applied
technologies.
Keywords: information store, banking
system, operational standard,
decision-making.
SUMMARY
Basic trends in diagnosing
the financial status of georgian enterprises
Magradze M.D.
Georgian Technical University
The problems associated with the necessity in
diagnosing the financial status of the enterprise are considered. Special
attention is given to the methodical approaches to the realization of diagnostics,
the problems of the cycle of production development, the analysis of the
financial status of the enterprise, the necessity in management - marketing
renewals etc. The required computation of the financial indices of the
enterprise is presented.
Keywords: enterprise, financial status, diagnostics, basic
trends.
DATAWARE AND LEGAL REASONING
OF THE ENVIRONMENTAL MONITORING
Shatberashvili I.G., Chkhartishvili
A.G., Japaridze L.G.,
Tsitskishvili M.M., Ninua T.L.,
Osidze I.G. and Tsitskishvili M.S.
Georgian Academy of the Ecological Science
Abstract. Today, in resolving the tasks of environmental
monitoring in practice, the basic limiting factors are economic - cost
estimations. Hence the issues of typisation and statistical reliability are of
primary importance. It is necessary to understand the unity and the contrast of
the problems of monitoring for various
environments. From the point of view of the theory of informational science, at
the present stage, the problems of monitoring should be considered joinly for
all three natural environments (air, ground, water). It is justified by uniform
operating administrative-legal basis and uniform methodology of the theory of
informational science as well as by
close coherence of the environments.
Keywords: environment, ecology, monitoring, dataware, legal
reasoning.
Summary
Ecological PROBLEMS OF the
MODELING of SUSTAINABLE FUTURE OF the REGION
Chkhaidze N.Z., Tsitskishvili M.S., Tsitskishvili M.M.
and Japaridze L.G.
UNESCO Chair of Ecological Education and Management, Georgian Technical
University
The ecological crisis, the main alternative of the progress of modern
civilization, has posed a number of problems, including educational ones, to the
developing world community. In this work, the basic criteria of differentiation
of ecology from other natural sciences – the existence and the indissoluble
unity of "ecological triad" are formulated; the basic problems of
ecology of the Caucasus are revealed, and hence
the basic aims of environmental protection for achievement of
sustainable development of the region are formulated.
Keywords: environmental
protection, ecological problems, sustainable future, ecological triad,
modeling.
SUMMARY
ON THE BASICS OF MANAGEMENT OF TECHNOGENIC AND ECOLOGICAL
SAFETY
AND RISKS
Chkheidze N.V. and Tsikhelashvili Z.I.
Georgian Technical University
Successive
stages in the management of technogenic and ecological safety and risks are
discussed in accordance with the essence and the function of such management. It
is emphasized that, at the regional level (cities, provinces etc,), the safety
and risk management must mainly be aimed at the resolution of perspective
long-term tasks, the formation of target settings and strategies of risk
management and also at working-out of essential legal-normative bases for
ensuring the high level of human life. The approaches of functional subsystems
and measures to the corresponding problems on providing the technogenic and
ecological safety and the risk management for making the adequate management
decisions under the conditions of emergency situations are discussed.
Keywords: emergency
situation, organizational basis, technogenic safety, ecological safety, risks,
management.
SUMMARY
On
some physical-chemical properties of
nanomodified zeolites used in the practice of desiccation of organic liquids
Andronikashvili T.G.,
Eprikashvili L.G., Kordzakhia T.N., Pirtskhalava N.V.,
Zautashvili M.G. and
Dzagania M.A.
P. Melikishvili Institute of
Physical and Organic Chemistry
There are discussed some issues of physical-chemical properties of the
most studied zeolites such as the zeolites of groups A, X and Y, mordenite,
erionite, clinoptilolite-heulandite, phillipsite and chabazite. It is
demonstrated that their molecular-sieving properties depend not only on the
geometry of channels, but also on the chemical composition of crystals and,
first of all, on the origin and the number of cations compensating the negative
charge of alumosilicate lattice.
Keywords: zeolite, molecular sieves, physical-chemical properties, mordenite,
erionite, clinoptilolite, heulandite, phillipsite, chabazite.
Summary
Eh-sensitive
GLASS ElectRodes with Electron Conductivity
Dolidze V.A. and Dolidze A.V.
Georgian Technical University
The state of art and the
prospects of designing of glass electrodes with electron conductivity for
measurements of redox potentials of solutions under different conditions are
discussed. The compositions of developed Eh-sensitive electrode glass and the
electrodes produced on its basis commercially are described. The possible
influence of cations on the electrode (hydrogen, metallic, oxidation) functions
of the glass is discussed. The results of the study on the positions of
isomorphic substitution of atoms in crystals are given.
Keywords: ionometry, redoxmetry,
glass electrodes, electron conductivity, properties.
Summary
Metallographic analysis of the welds of some steels
Dadianidze
G.A., Khutsishvili M.G. and Sulamanidze A.K.
F.
Tavadze Institute of Metallurgy and Materials Science
Georgian
Technical University
Georgian
Engineering Academy
Microstructural
studies on the welds of ADS steel of quality DI-46 and DI-47 at different speed
of cooling (from 150/s to 1800/s) were performed. It is
shown that the increase in speed causes changes in the structure and the
hardness of steels . By X-ray microanalyses, it was established that the welds
of steels DI-46 and DI-47 contained titanium carbides TiC and Ti(C,N).
Keywords: welding, steel, welds, titanium carbide, metallographic analysis.
Summary
The
study on the effect of coating on the weld strength
Sulamanidze A.K.,
Khutsishvili M.G. and Dadianidze G.A.
Georgian Technical
University
F. Tavadze Institute of
Metallurgy and Materials Science
The results of testing showed that, at welding, steels of quality DI-46
and DI-47 tend to forming the cooling cracks. Though, the weld strength of
those steels could be controlled by varying the weld metal composition with the help of coatings.
Keywords: welding, steel, welds, coating, weld strength.
Summary
On
promising high-tech methods of
solid fuel combustion
Kevkhishvili N.a., natsvlishvili t.sh
and kevkhishvili v.A.
Georgian Technical University
A brief review
of the methods of combustion
of low-reaction solid
fuel is presented. The
advantages and the drawbacks of
these methods are assessed. their applications
are discussed. The
advantages of solid
fuel combustion by
using the fluidized bed
are justified.
Keywords:
solid fuel, fluidized
bed, combustion, perspectives.
Summary
The methods of water treatment in
horizontal settling chambers
Mamedov akhmed shirin ogli
Research and design institute “sucanal”, baku,
Azerbaijan
The problems of treatment of highly muddy water
for farming water supply in arid zones are discussed. Under such conditions,
for treatment of highly muddy surface waters, traditional radial and horizontal
settling chambers are used. In this paper, a new efficient construction of the
settling chamber is offered. The constriction is described in detail. The
specific feature of the chamber is that its middle wall is equipped with deep
gates, which are located at the level of silting of the chamber.
Keywords: muddy
water, water treatment, horizontal settling chamber, construction.
Summary
On the toxicity of exhaust
gases of Diesel ENGINES AND THE WAYS OF ITS REDUCITON
Purtskhvanidze G.N. and Lomidze A.N.
Akaki Tsereteli State University, Kutaisi
The
harmful impact of automobile transport on the environment and the human health is discussed. The
sources and the concentrations of toxic substances in exhaust gases of internal
combustion engines are described . The effect of the process of filling of
cyinders on the power and toxic indices of the engine is considered. A new
design of the air system is proposed. The system allows us to increase the mass
of fresh air charge, to reduce the irregularity of filling of the cylinders and
hence to reduce the specific fuel consumption and the fumes of exhaust gases.
Keywords: diesel engine, exhaust gases, environmental protection, toxic substances, air supply system.
SUMMARY
On the new methods of minor
repairs on the road carpet
Shishinashvili M.T., Burduladze A.R. and Kachiuri B. I.
Georgian Technical University
Some new methods of minor repairs of the road carpet
are discussed. Basically, the way of patching repair is considered. There are also given the methods which have
been implemented and are widely used in the leading countries: the injection
technology – microsurfacing
and the use of poured asphalt. The implementation of abovementioned
technologies and their wide application in Georgia will provide the
preservation of transportation-exploitation indices of the road carpet and will
increase the overhaul period, which will give a significant economic effect.
Keywords: road carpet, minor repair technology.
SUMMARY
ON THE USE OF SOME STATISTICAL CRITERIA IN
DECISION-MAKING
Tsikhelashvili Z.I., Lezhava A.P., Giorgadze G.P.,
Giorgadze P.Sh. and Verulava G.I.
Georgian Technical University
The
problems of using some statistical criteria in decision-making are discussed. Among
those criteria are the following: Wald maximum criterion (extreme pessimism
criterion ), Savage criterion of maximum risk (extreme optimism criterion) and
Hurwitz pessimism-optimism criterion which is recommended to compute for
something intermediate between pessimism and optimism. It is recommended to use
those criteria for decision-making under the conditions of stochastic uncertainty, as the choice of the
decision based on one or other criterion would be more justified than the
volitional choice. Those criteria could be used for making decisions in various
fields (chemical technology, sociology, hydroengineering etc.), where different
kinds of uncertainty are encountered.
Keywords: decision-making,
Wald criterion, Savage criterion, Hurwitz criterion, stochastic
uncertainty.
Summary
On the assessment of
ecological risks with consideration for changing social-economical conditions
Lezhava A.P., Giorgadze G.P. and Verulava G.I.
Georgian Technical University
An
approach to the assessment of ecological risks with consideration for changing social-economic
and other conditions is proposed. The notions of “dose-effect” and
“action-effect” have been classified. The WHO, the American Agency of
Environmental Protection and the International Agency of Research of Cancer (IARC) have not worked out concrete
recommendations on the assessment of risks by these notions yet. The proposed
approach to the assessment of ecological risks is based on the determination of
probability parameters which the state and the stability of natural
communities and natural environment as a
whole depend on. On this basis, the formula of determination of the probability
of reduction in biological diversity below the criterion level is given.
Keywords: environment
protection, ecological risk, hazard measure, changing conditions, human health.
On the assessment of environmental pollution with
industrial organic pollutants
Chankseliani A.B., Kutsiava N.A., Gongadze N.P. and Legashvili I.T.
Ministry of Environment Protection and Natural Resources of Georgia
Georgian Technical University
Abstract. The inventories of polychlorinated biphenyls
and dioxin-furans on the entire territory of Georgia were prepared. The
industrial pollutants and the pollution
level were determined.
Keywords: environment
protection, organic pollutants, industrial waste, inventory, pollution level,
assessment.
Summary
The methods of data separation
at measuring the humidity and the density of constructional materians
Khurtsilava A.K.
Akaki Tsereteli State University, Kutaisi
The
methods of separation of the data on electrophysical characteristics of
constructional materials into the components concerning only the humidity and
the density are discussed. It is shown that it is more expedient to neutralize
the influence of mineralization of porous moisture, which is a noninformative
factor, by special measuring procedures, instead of increasing the number of
equations in the set and hence the number of measurement channels. At the same
time, the informative signal of the sensor must be always determined uniquely
by the reactive component of its impedance.
keywords: constructional materials,
humidity, density, data separation.
summary
optimal control of the
dynamics of soil humidity under drip irrigation
Javadzade e. b.
Research Institute of Erosion and Irrigation, Baku,
Azerbaijan
The
method of drip irrigation is discussed. it
is demonstrated that, in comparison with other methods of irrigation, the drip
irrigation provides optimal humidifying in
the root systems of plants, prevents the loss of water and forms the
conditions for economical use of irrigation water, which promotes the increase
in the soil temperature due to permanent circulation of water in the root
system and thus in the acceleration of plant growth. It is also justified that,
at drip irrigation, drops of water are accumulated in the active soil layer
more intensely, which reduces the surface runoff and, as a consequence, the
soil wash-out and compaction.
Keywords: drip irrigation,
soil humidity, optimal control.
Summary
Investigation And Intensification of the process of
ULTRAFILTRATION OF biological solutions
rukhadze Sh.Sh., Tavdidishvili d.R.,
lomaia R.T., pkhakadze t.Y. and beshkenadze
T.A.
Akaki
Tsereteli State University, Kutaisi
The
results of theoretical and experimental investigations on the concentration of
biological solutions are presented. The series of obtained results supports the
possibility of using the method of ultrafiltration for concentration of gamma
globulin. A method of reduction of the concentration polarization is proposed. Its efficiency is
justified theoretically and experimentally. The relationship between the
frequency of pressure pulsation and the height of intermembrane channel was
determined, which could efficiently be used in designing of flow membrane
devices. The obtained quantitative
results were quite satisfactory: under the pressure of 0.6 ± 0.1
MPa and at the temperature of 20°C, the permeability made up 6.5 l×m2/h , the membrane selectivity - 0.99.
Keywords: biological
solutions, ultafiltration, intensification.
EXTRACTION OF ECOLOGICALLY PURE BLUE VITRIOL
FROM CHALCOPYRITE ORES BY A
MICROBIOLOGICAL METHOD
Kaplanishvili J.Sh.
F. Tavadze Institute of Metallurgy and Materials
Science
Joint Stock Company MADNEULI
Abstract. As a result of
leaching of chalcopyrite concentrate by a microbiological method, complete
separation of copper and iron takes place. Sulfide copper is oxidized in the
amount necessary for formation of CuSO4∙5H2O, its
excess amount separates out in the elementary form. The amount of pyrite does
not change, the pyrite being enriched with gold and silver.
Keywords: chalcopyrite ore,
blue vitriol, leaching, microbiological method.
Certain Physiological and Bacterial Features of Thiobacillus Ferrooxidans Found in
Sulphide Ores and Thermal Sulphur Waters of Georgia
Sakhvadze L.I., Kaplanishvili J.Sh., Sakhvadze D.V. and Tavadze G.F.
F. Tavadze Institute of Metallurgy and Materials Science
Joint Stock Company MADNEULI
Abstract. The morphologic-culture-
and physiologic-biological features of
the isolated strains were studied . It was established that they belonged in
the species of Thiobacillus ferrooxidans.
The species of Thiobacillus ferroxidans.
The specific feature of this culture is its high activity both in the oxidation
of iron and in the formation of oxalic acid, This is of great importance for
reduction of oxidized compounds of various metals.
Keywords:Tiobacillus ferrooxidans, sulfide ores, thermal sufide waters, physiological
features, biochemical properties.
Summary
The effect of wine maturation in oak wood on the
changes in chemical components of wine
Megrelishvili
M.M.
Institute
of Horticulture, Viticulture and Wine-Making
The wines matured in new and old oak casks were
analyzed. The samples were taken from red dry wine made of Saperavi variety
grape and the Kakhetian-type wine made of Rkatsiteli variety grape. The casks
were made from oak species Quercus
iberica. The effect of maturation in oak wood on the changes in spirit
percentage, volatile acids, catechols, flavonols and polymeric proanthocyans in
matured wines was revealed.
Keywords: mature wines, oak cask, maturation, chemical components.
The Influence of
Microfertilizer “Lile” on Vegetable Growth and Development
Rekhviashvili L.M.,
Orjonikidze E.K., Chikhladze
G.M., Lortkipanidze R.O.,
Chachkhiani N.R., Gakhokidze R.A. and Bazerashvili
L.G.
L. Kanchaveli Research Institute of Plant Protection, Tbilisi
Georgian State University of Subtropical Agriculture, Kutaisi
Iv.
Javakhishvili Tbilisi State University
Agricultural
Biotechnological Center, Tbilisi
Abstract. The article deals
with the issues of treatment of vegetable shoots with environment friendly
microfertilizer “Lile”. Such treatment gives high ecological and economic
efficiency. Mictofertilizer “Lile” increases the biometric indices of plants,
facilitates the activation of on-going living processes in the plant and the
plant endurance towards a complex of diseases. The given fertilizer “Lile” may be
used as the effective and ecologically safe means of increasing the plant endurance
towards a complex of diseases, facilitating the plant growth and development and
improving the qualitative-quantitative indices of crops.
Keywords: vegetable culture,
microfertilizer, preparation Lile, efficiency.
ON the measures of Struggle against Citrus Culture
vermins
Orjonikidze E.K., Rekhviashvili L.M., Lortkipanidze R.O.,
Chachkhiani N.R., Gakhokidze R.A.
and Bazerashvili L.G.
L. Kanchaveli Research Institute
of Plant Protection, Tbilisi
Georgian State University of Subtropical
Agriculture, Tbilisi
Iv.
Agricultural Biotechnological Center, Tbilisi
Abstract.
The worked-out measures of
struggle with vermins of citrus cultures ensure
higher biological and economic efficiency. In particular, modern insecticides and
biological preparations allow controlling the number
of vermins. Up to 92-95% of the vermins are
eliminated; the harvest increases by 28-32%, and the profitability reaches 300-350%.
Keywords: citrus cultures,
vermins, insecticides, measures of struggle.
SUMMARY
Changes
in the quality of hazelnut fat under
heat treatment with IR radiation
Silagadze M.A., Berulava I.O. and
Iobidze A.V.
Akaki Tsereteli State University,
Kutaisi
It was established that irradiation of hazelnut
nuclei with IR rays allowed reducing the heat treatment duration by a half as
compared to the traditional method of roasting (with hot air at 130-1450C).
In the latter case, the time of roasting makes up 30 min, whereas the time of
IR heat treatment makes up 15 min (at 1500C). At tasting, the
hazelnuts roasted by using the IR radiation at 1500C for 15 min
gained the highest estimation (87 points). It was also established that
roasting of hazelnut nuclei at different temperature hardly affected the
peroxide number of hazelnut fat. The hazelnut nuclei roasted by the proposed
method should be stored in cellophane packages for 6 months.
Keywords:
hazelnut, IR radiation, peroxide number, roasting, fat.
Summary
Technology of production of cornel jelly
Shildelashvili
I.I.
J.
Gogebashvili Telavi State University
The study on the improvement in the technology of
production of cornel jelly was performed. It was established that, from every
variety of cornel fruit: Crimean bottle-shaped, Large-fruited late, Lagodekhi
early, Small-fruited late and Okroshinda, which are spread in Kakheti zone, it
is possible to produce high-quality jelly. The raw materials should be of
complete ripeness for making the high-quality jelly from the damp fruit. Keeping
the fruit under usual conditions for 1-2 days gives us good results if it is
fresh-gathered. Boiling of the raw materials for 20 minutes by adding 20% water should
be considered as the optimal conditions for making the juice from the raw
materials. For making the jelly, it is better to take the 1:1 proportion of
juice and sugar and to boil the mixture for 20 minutes. In the high-quality
jelly, the proportion of main components should be presented approximately in
this way: sugar - not less than 58%; pectin - not less than 0.8%; acid - not
less than 0.95%; water – 39.5%; active acidity – 3.2. So the cornel jelly
represents a national, ecologically clean product, which contains vitamins,
mineral substances and amino acids. It does not need particular conditions of
storage. The described cornel jelly can be widely used in cookery and canning.
Keywords: cornel, jelly, production process, quality.
Summary
The study on the possibility Of
proDuction of secondary raw materials from used thermoplastic items
Gachechiladze M.V.
Akaki Tsereteli State University, Kutaisi
For
protection of the environment from pollution, the possibility of production of secondary raw materials from
used thermoplastic items is discussed. There is offered a two-stage procedure. At the first stage the rheological and
technological parameters of the items are studied by using the rheometer
modified by the author (patent is available).
At the second stage, the items are recycled with the help of the granulating
unit, designed by the author, for production of secondary raw materials. The design and the production process are
briefly described. The prospects of improving the granulator design and its
serial production are shown.
Keywords: thermoplastic
items, secondary raw materials, recycling, rheometer, granulating unit.
SUMMARY
OPTIMAL DESIGNING OF THE PROCESSES OF MANUFACTURE OF GARMENTS
Zakaraia M. M.
On the
basis of research of traditional designing techniques of sewing processes and
the development of computer-aided design system, a range of problems which must be solved first of all for creation of
the uniform theoretical and informational bases for computer-aided designing of
sewing flow lines has been outlined.. The basic functional units with the
prospects of stage-by-stage progress and the system extension were
designed. For the
purpose of implementation of design procedures, the algorithm and the program, which were
tested on a model of women’s summer dress, were developed. The software package
can be applied to the computer-aided design of the process of manufacture of
garments of various types and models. The practical significance of the
proposed software consists in making simpler the process of designing, reducing
the number of designers and the operating space, raising the level of
technological solutions, etc.
Keywords:
production of garments, computer-aided design, optimization.
SUMMARY
THE ORGANIZATION OF INPUT
DATA FOR THE COMPUTER-AIDED DESIGN
OF SEWING FLOW LINES
Zakaraia M. M.
The database developed for a concrete sphere - computer-aided design of
sewing flow lines suits the basic requirements to databases such as
compactness, self-descriptiveness, perfection, visualization, unification,
profitability, simplicity of application and sweeping access to the data. For
the developed arrays, the structure of logical links was established in
accordance with the sequence of formation of inquiries during the execution of
design procedures. Some data groups can be applied to the computer-aided design
of the processes of manufacture of garments of any kind and model.
Keywords: manufacture of garments, computer-aided design, sewing flow line,
organization of input data.
Summary
The Conditions of wet processing of fiber
material on the Twistless spinning machinE
Moseshvili T.V., Gamkrelidze E.A.
and Goginovi K.G.
Akaki Tsereteli State University, Kutaisi
The degree and the speed of activation of the
binding substance depends on the conditions of wetting and on the compaction of
the fiber material. The thickness of
the liquid film on the surface of fibers is considerably less than the sizes of drops
of the liquid generated by sprayers, which testifies to the necessity in
compression of fibrous product for the purpose of redistribution of the liquid in
the volume of their pores. The optimum pressure of air in the aerodynamic twisting
device for formation of high-grade conditions of wetting and activation of PVC fiber
should not exceed 0.004ÌPa.
Keywords: fiber, wet processing, twistless spinning machine.
Summary
The Influence of Twistless Structure of the Yarn on its mechanical
properties
Moseshvili
T.V., Gamkrelidze E.A. and Maglaperidze Z.I.
Akaki
Tsereteli State University, Kutaisi
The twistless yarn is formed at pasting of
separate fibers as a result of interaction between the binding substance and
the fiber. As the research has shown, the most part of fiber belongs to class 0, where the average factor of
extent of fiber is equal to 1. The fibers are extended in parallel to the axis
of the yarn along their entire length and are basically located close to
the product axis. The peripheral fiber
belong to other classes, they are
located along screw lines with a big step. The durability of twistless yarn is much higher than the durability of
the yarn produced by ring spinning.
Keywords: twistless yarn, fiber, structure, mechanical properties.
Summary
Mathematical model of interaction of solar radiation
with the structure of textile fabric
Gintibidze
N.G., Mardaleishvili Z.Z., Sopromadze I.G., Cheishvili M.O. and Tkhelidze N.N.
Akaki Tsereteli State University, Kutaisi
The issues of the influence of solar radiation on the human organism are considered. A mathematical model of interaction of solar radiation with the structure of textile fabric is given.Keywords: solar radiation, textile fabric, interaction, mathematical model.
summary
Modeling of the friction gear transporting
fiber Fibroin 3
Gintibidze N.G. and Zakaraia M.M.
Akaki Tsereteli State University, Kutaisi
The purpose of designing of the device is
mechanization and automation of the process of formation of the fiber produced
by chemical processing of waste products. A characteristic feature of the
device is the arrangement of its units in the closed space, the form and the
dimensions of which are limited. Thus it is necessary to note the complexity of
technological process which consists of a plenty of operations that are carried
out in the chemical environment. In conformity with the modular principle of
construction of machines, on the basis of the initial technological process, an
original friction gear for transporting the fiber has been designed.
Keywords: fiber, transportation, friction gear, design.
Summary
Dyeing
of woolen fabrics with natural bioprotective dyes
The basic characteristics of safety of textiles have
been investigated and compared with the authorized norms. The ðÍ value of the water extract from the fabric
should be equal to 4.0 to 7.5. This is due to the fact that our skin
(consisting basically of collagen fiber) has typically ðÍ4.5 to pH5.5 (isoelectric point). The stability of coloring to sweat and saliva
(for children) is also very important. This parameter of stability is connected
with safety, as the dye exposed to the influence of sweat or saliva could get
into the organism.
Keywords: wool, natural dyes, dyeing.
Summary
on the problem of children’S
Shoes associated with foot pathology
Grdzelidze M.G. and Katamadze A.G.
The
pathology of children’s feet could be the first symptom of serious problems
with health. Reflexogenic zones and points that innervate almost all the organs
of human body are located on feet. The flat foot is a kind of foot deformation
with flattening of foot vaults. There are recognized lengthwise and cross kinds
of flattening. Their combination is also possible. The results of our studies
enabled us to work out the recommendations on prophylaxis and preventing the
development of flat foot in children by choosing the appropriate shoes and
orthopedic appliances.
Keywords: shoes for children,
flat foot, orthopedic appliances, prophylaxis.
SummAry
On the specific
requirements imposed upon
footwear with consideration
for foot pathology
Grdzelidze
m.g., katamadze a.g. and shalamberidze m.m.
The
issues of taking
into consideration the
specific features of
foot structure in
footwear production have
not been adequately
studied. Especially this
concerns various foot pathologies. More precise
definition of their severity and frequency of occurrence is
essential for their
prophylaxis and elimination. The incorporation of correcting elements into working
and daily footwear is a necessary and
efficient measure. Based on considerable experimental materials, the specific requirements
imposed upon footwear with
consideration for foot pathology are
discussed.
Keywords:
footwear, foot pathology, specific
requirements.
