EFFICIENT
SOLUTION TO THE FIRST BASIC BOUNDARY PROBLEM OF THE MOMENT THEORY OF
THERMOELASTICITY FOR THE HALF-PLANE
Javakhishvili G.I.
Georgian
Aviation University
The article
deals with the efficient solution to the first basic boundary problem of the moment theory of thermoelasticity for the half-plane.
Keywords:
thermoalasticity
theory, boundary problem, efficient solution, half-plane.
A METHOD OF FILTERING OF NONSTATIONARY TIME SERIES
Buzaladze A.Z. and Macharadze
T.D.
Georgian
Technical University
Abstract: A new method and an algorithm of filtering of time
series are proposed. The method is based on the analysis of the singular matrix
of time series
data. For calculation
of singular values and vectors, a low-rank tensorial
approximation was used, which was realized through the
algorithm that does not require
the inversion of matrices. It is shown that the developed method can be
used successfully as a universal nonparametric filter for nonstationary
time series.
Keywords:
singular values, singular vectors, low-rank tensorial approximation, harmonic decomposition, periodic
components, white noise components
SERIALLY
CONCATENATED MINIMUM SHIFT KEYING AND ITS USE IN THE CODING SCHEME FOR THE
RELAY CHANNEL
Shavgulidze S.
A., Tabuashvili G. O., Mtvralashvili
T. I. and Barbakadze S. Sh.
Georgian
Technical University
Abstract. The
serial concatenation of the outer convolutional code,
a designed interleaver and inner minimum shift keying
(MSK) in discussed. This system ensures better performance than the one with a random
interleaver and woven coded MSK. The considered coded
modulation technique is proposed for relay channels. The simulation results are
compared with the theoretical bound.
Keywords: serially
concatenated minimum shift keying, coding, relay
channel.
SUMMARY
SPACE-TIME
CODING IN HIGH-SPEED DATA TRANSMISSION SYSTEMS
Tskvitinidze I.V. and Beridze J.L.
Georgian
Technical University
MIMO technology
is one of important trends that allow us to impove
significantly the characteristics of communication systems. This is achieved
owing to the fact that MIMO channels provide coding and separation gain by
space multiplexing and reducing the degree of interference. This gain is
realized through space-time block coding STBC and STTC. As for the data
transmission speed, BLAST system is of primary importance for its increase.
MISO technology is used to improve the resistance to interferences. The article
deals with the peculiarities of application of STC to the OFDMA method. The use of drastic
changes in frequency along with STC coding is discussed. The scheme of
realization of this method is given, and the possibilities for the two-fold
increase of the transmission speed are shown.
Keywords:
space-time coding, STBC, MIMO systems, BLAST system, MISO technology, OFDMA
modulation.
SUMMARY
EXTENSION
OF RADIO COVERAGE BY USING NEW SIGNAL-PROCESSING ALGORITHMS IN NEW-GENERATION
MOBILE COMMUNICATION NETWORKS
Tskvitinidze I.V. and Beridze J.L.
Georgian
Technical University
For increasing
the transmission speed in new-generation (3G and 4G) mobile communication
networks, new signal-processing algorithms, providing both high energy and
spectral efficiency, are used. In turn, the impoved
energy efficiency could be used for extending the radio coverage area, as it
provides radio-wave propagation for longer distances, i.e. the cell radius
increases. This, in turn, allows reducing the number of base stations necessary
for covering a certain area. The factors affecting the radio waves cause rheir damping. This phenomenon is assessed by using various
available models: Okamura-Hata, Wallfish-Ikegawa
and COST-Hata ones.
Keywords:
mobile
communication networks, space-time coding, energy efficiency, spectral
efficiency, MIMO systems, OFDM modulation.
SUMMARY
JITTER:
THE ASPECTS OF ITS MEASUREMENT AND ASSESSMENT
Chkhaidze M.T. and Svanidze R.G.
Georgian
Technical University
The article deals with the
jitter in digital fiber-optics transmission systems. Its significance, the
causes of its emergence and its physical character are discussed. The
classification of jitter, the methods of its measurement and assessment are
presented. Among these
methods, the dual Dirac method is considered as the latest. This method allows
us to represent the jitter as the deterministic jitter (DJ) and the random one
(RJ). The basic requirements to the jitter in the systems of Plesiochronous Digital Hierarchy (PDH) and Synchronous
Digital Hierarchy (SDH) were determined in accordance with the norms of the
International Teleommunication Organization ITUT. The
jitter testing mask is given. The article enables one to comprehend the basic
processes associated with the jitter as a whole.
Keywords:
jitter,
digital transmission, digital hierarchy.
SUMMARY
THE
METHODOLOGY OF ASSESSMENT OF JITTER
Chkhaidze M.T. and Svanidze R.G.
Georgian
Technical University
The article
deals with the assessment of jitetr using the dual
Dirac method. The graphs of the bit error rate (SIR) versus the unit interval
(UI) were constructed for certain values of deterministic (periodic and
periodic sinusoidal) and random jitter in the error time interval (ETI), BER=
(UI).The suggested methodology allows us to determine
the impact of the jitter on communication networks and its dependence on the
bit error rate, and to assess the stability of the digital communication system
as a whole in respect of noises (interferences).
Keywords:
communication system, jitter, dual Dirac method, bit error rate.
SUMMARY
DATABASES AND INFORMATION SYSTEMS
Khartishvili
M.P.
Georgian Technical University
The article deals with the
problems of long-tem storage of data and controlled access to them. It is
emphasized that, for the progress of modern efficient education of all kinds
and at all stages and for the
improvement of the efficiency of scientific research, it is
essential to provide information-analytical
support to both educational technologies and scientific investigations.
Keywords:
education, research, database, information system.
SUMMARY
ZONAL
ENCODING OF THE TRANSFORMANTS OF IMAGES BASED ON THE ANALYSIS OF
STATISTICAL CHARACTERISICS OF TRANSFORMANTS
Khuntsaria J.M.
and Jgamadze M.S.
Georgian
Technical University
The article
deals with the algorithm of entropic compression of the array of discrete
cosine transformation coefficients based on the zoning of transformants
and application of the Huffman code for the coefficients within the zones.
Keywords: discrete
cosine transformation, transformant, entropy coding,
Huffman’s codes.
SUMMARY
NONSINUSOIDAL
CURRENTS AND THEIR USE IN CONTACT MICROWELDING
Sulamanidze A.K., Neverov A.P. and Vatitadze G.Z.
Georgian
Technical University
The article deals with the
application of nonsinusoidal currents to contact microwelding. It is shown that the impact of higher harmonics of the commercial
frequency on contact microwelding is decisive.
Keywords: microwelding, nonsinusoidal
current, commercial frequency, higher harmonic.
ENTROPIC CHARACTERISTIC OF FREE
MARKET
Kadagishvili L.G.
and Menabde D.A.
V. Chavchanidze
Institute of Cybernetics, Georgian Technical University
Abstract.
The article deals with the issues associated with the free market, which, as it
is a multicriterion information system, must be
subject to the equity policy of the principle of element formation
“Goods-Consumer” typical of the market. Approximation to the market balance
seems real if the equity principle is observed, which is actually impossible,
as its course is entropic in its nature. In the given case entropy is a more
real characteristic of the state than statistical characteristics defined by a
probable value. The practical study of the free market balance by using this
method has showed that the existence of object spectrum will be challenged in
general and criteria of their accomplishment in particular.
Keywords:
free market, goods, consumer, information system, entropy, probability, incertainty.
SELF-CONTROL OF THE LIVING
ORGANISM AS A SYSTEM
Kadagishvili L.G.
V. Chanvchanidze
Institute of Cybernetics of Georgian Technical University
Abstract.
The article deals with the living organism as a system, which is a
self-controlled system reacting to different changes in the environment as a
whole entity. A certain organization established in the organism takes place at
the molecular level. The complexity of the structure and specialization of
tissue functions stipulate their morphological and functional peculiarities,
which depends on even minor distrurbances of
homeostasis. The changes lead to the disturbance of constant physiological
indices, which causes the loss of energy. Such a phenomenon
may dsturb the balance of substances in the cell and
cause th evolution of energy.
Keywords:
living organism, functions of tissues, homeostasis, self-control, energy.
SUMMARY
APPLICATION OF ROBOTICS AND OMPUTER ENGINEERING TO BRIDGE
MECHANISMS
Kheladze G.V., Purtskvanidze G.N., Uriadmkopeli T.D. and
Purtseladze I.G.
Energo ProGeorgia
Akaki Tsereteli
State University, Kutaisi
The article
deals with the problems of mechanization and automation of agricultural
operations with the aim of making them easier and more efficient. This
objective could be accomplished by designing the bridge mechanism using
robotics and computer engineering.
Keywords:
agricultural operations, bridge mechanisms, robotics, computer engineering.
SUMMARY
MULTIAGENT
CONTROL SYSTEM FOR THE CUTTING TOOL OF A TEA PICKING DEVICE
Machavariani G. A. and Lezhava G. G.
V.
Chavchanidze Institute of Cybernetics
The article
deals with the two-agent control system for the cutting tool, where most
attention is focused on the problem of agents interaction. Both the character
of agents interaction and how the two-agent system can accomplish complex
behavior when the agents themselves are simple is clearly shown.
Keywords:
collective
behavior of automations, multiagent sysem, hybrid system.
SUMMARY
TESTING
OF INSTRUMENT VOLTAGE TRANSFORMERS UNDER HIGH AND ULTRAHIGH VOLTAGE
Karasiev
B.V., Tugushi M.A. and Loria
M.D.
Shota Rustaveli
State University, Batumi
The article deals with
an alternative procedure of on-the-spot determination of the transformation
coefficient of the instrument voltage transformer (IVT) under high and ultrahigh voltage (up to 1 000 kW). The IVT
is usually tested by mobile testing laboratories, which is rather expensive
and complicated. In this article it is proposed to solve this problem by
designing the self-testing IVT.
Keywords:
high power, instrument voltage transformer, accuracy.
SUMMARY
THE
INVESTIGATION AND PROCESSING OF THE MATERIAL OF THE WELDING ELECTRODE COATING
Sulamanidze A.K., Dadianidze G.A. and Nikolava O.I.
Georgian
Technical University
It is
offered to use local raw materials for the coatings of arc welding
electrodes. Experimental studies were performed, pilot electrodes
were fabricated, and the possibilities of correction of the composition of
local raw materials were studied. Currently the optimal composition is being
established.
Keywords:
welding electrode, coating,
local raw materials.
STUDY ON THE WORKING CONDITIONS
OF VEHICLE DRIVERS
Gogiashvili
F.G., Kikvidze O.G. and Kachakhidze
I.S.
Akaki Tsereteli
State University, Kutaisi
Particular
attention is given to horizontal vibrations of the driver’s seat. The graphs
reflecting the density of the acceleration of the driver’s seat are given. The
results of experiments under road-experimental conditions showed that the
longitudinal vibrations depended slightly on the fluctuations in the vehicle
speed (by about 3-5%) and made up 60-80% of the vertical vibrations, while the lateral
vibrations made up 70-100% of vertical vibrations and sometimes even exceeded
them. The experimental suspension reduced the load on the driver’s seat by
20-25% in the longitudinal direction and by 20-35% in the lateral direction.
The vibrations over the range of 1.5-2.5 Hz were reduced by 20-45%, while the
ones over the range of 4-6Hz – by 20-30%. Over the high-frequency range, the
difference was insignificant.
Keywords:
vehicle, driver’s seat, vibration, suspension.
SUMMARY
PETROLOGY OF QUARTZ
PORPHYRY-GRANITE PORPHYRY OF THE ASLANURA RIVER
Adeishvili N.A., Akhvlediani I.A. and Paradashvili
I.I.
Georgian Technical
University
The petrochemical and thermodynamic conditions of
formation of the comagmatic complex of the Aslanura River were reproduced on the basis of petrographic and topomineralogic
investigations, and conversion of the data of the chemical analysis of quartz
porphyry-granite porphyry rocks.
Keywords: petrology, quartz
porphyry, granite porphyry, comagmatic complex.
LITHOLOGY
OF PALEOGENIC DEPOSITS OF THE MIDDLE IRANIAN MOUNTAINS
Makharadze A. I.
Akaki Tserteli
State University, Kutaisi
The article
deals with the characterization of lithologic specific
features of the deposits of the Middle Iranian Mountains. The deposits are
classified into eleven lithologic-stratigraphic
groups according to their specific features.
Keywords: Paleogene, Paleocene, Ecocene,
lithography, deposits.
SUMMARY
ON THE
INVESTIGATION OF THE BASIC PARAMETERS OF THE ANTIHYPODYNAMIC PNEUMATIC MASSAGE
DEVICE
Kharatishvili A.G., Chabukiani R.R. and Purtskvanidze
G.N.
Akaki Tsereteli
State University, Kutaisi
The
article deals with the theoretical prerequisites of determination of basic
mechanical and technological parameters of the antihypodynamic
pneumatic massage device designed for the operators of vehicles.
Keywords: pneumatic
massage device, operators of vehicles, hypodynamics.
SUMMARY
AUTOMATED
CONTROL OF THE COAGULATION OF SEMIMUDDY NATURAL WATER BY A CONDUCTOMETRIC
METHOD
Makhashvili K.A., Padiurashvili Z.V., Kolomikovi
S.G. and Semenov R.V.
Georgian
Technical University
The article deals with
the problem of treatment of semimuddy natural water
with coagulants. It is demonstrated that there is a necessity in designing the
automated measurement – control instrumentation based on the conductometric method for controlling the process of
coagulation.
Keywords:
coagulation, coagulant dosing, water treatment, conductometry.
SUMMARY
TREATMENT OF THE
WASTE WATER CONTAINING SULPHATES OF NON-FERROUS METALS AND OBATAINING OF
PURIFIED WATER AND METALS
Kavtaradze M.L., Chkhubianishvili N.G., Bibiluri N.Sh.,
Mchedlishvili G.S. and Eristavi D.V.
Georgian Technical University
The offered method enables us to neutralize sulphates completely,
to make the heavy metals pass into the sediment, filtrate it and obtain
the purified water no more containing the ions of
heavy metals and their sulphates. This water could be discharged into a river or used for technical purposes. From the sediment, copper, zinc, cadmium and γ-modification of manganese dioxide can
be extracted selectively.
Keywords: waste water treatment, sulphates,
non-ferrous metals.
SUMMARY
HYDROCHEMICAL INVESTIGATIONS OF THE MASHAVERA RIVER AND
THEIR RESULTS
Bakradze E.M., Kuchava G.P., Arabidze M.A., Buachidze N.S.
and Shubladze E.Sh.
National Environmental Agency, Ministry of Environment
Protection and Natural Resources
Institute of Hydrometeorology, Georgian Technical
University
The article deals with the investigation of physico-chemical and hydrochemical
parameters of the Mashavera River. The degree of pollution of the river with heavy
metals was determined. The concentrations of heavy metals at the background section of the Mashavera River and
at the sites of anthropogenic impact were determined for 2011.
Keywords:
environment
protection, anthropogenic impact, hydrochemical
parameters, heavy metals, water pollution.
SUMMARY
PECULIARIRIES
OF THE GENERATION OF EFFECTIVE “NEGATIVE” PRESSURE IN LEAD SELENIDE NANOLAYERS
Pashaev
A.M., Davarashvili O.I., Enukashvili
M.I., Gulyaev R.G., Dzagania
M.A. and Zlomanov V.P.
National
Aviation Academy, Baku, Azerbaijan
Iv.
Javakhishvili Tbilisi State Univesity,
Georgia
M. Lomonosov Moscow State University, Russia
The article deals with the conditions of genetation of effective “negative” pressure (deformation),
determined by tangential lattice constants of layers, in lead selenide nanolayers. It was
revealed that the maximum tangential lattice constants were realized in the nanolayers <100 nm thick. As the layer growth rate
decreased to 0.6 nm/s, the tangential lattice constants increased up to 6.190Å. In the layers ~
200 nm thick, the dependence of the tangential lattice constant on the growth
rate went through the peak, and, at minimum (1 nm/s) and maximum (~20 nm/s)
growth rates, the tangential lattice constant made up 6.130Å. The
mechanisms of generation of “negative” pressure in lead selenide
layers are discussed. For the samples under consideration this pressure made up
about 8 kbar.
Keywords:
nanolayer, mismatch, layer thickness, tangential lattice constant,
“negative” pressure, growth rate.
SUMMARY
THE SUPPOSED ROLE OF MCl26H2O IN
THE FORMATION OF NANOCRYSTALLINE TITANIUM CARBIDE
Miminoshvili
E.B., Beridze L.A. and Vardosanidze
T.O.
Georgian Technical University
University of Georgia
It is supposed that
the addition of MCl2·6H2O
(M(II)=Co, Ni) to the blend of (NH4)2[TiF6] and
urotropine increases the temperature of
volatilization of the latter, which promotes the formation of nanocrystalline titanium carbide by thermochemical
synthesis.
Keywords: titanium carbide, nanocrystals, synthesis, hydrogen bonds.
SUMMARY
BIOLOGICALLY
ACTIVE STILBENOIDS AND LIGNANS IN THE EXTRACT OF VINE CUTTINGS
Elanoidze
L.D., Bezhuashvili M.G. and Okruashvili
D.Sh.
Jakob Gogebashvili
State University, Telavi
Georgian
Agrarian University, Tbilisi
Lignan – α-conidendrin was
isolated from the alcohol extract of vine cuttings and identified by spectral
analyses. Its retention time under liquid chromatograply (RT-25.6 min) and at
the wavelength of 206 nm was determined. The antioxidant activity of α-conidendrin
determined by the method of electron paramagnetic resonance made up 35%. High
content of α-conidendrin in the the stilbenoid-rich extract is a
good point from the standpoint of the medicinal-prophylactic value of the
target product.
Keywords: α-conidendrin,
stilbenoids, vine cuttings, extract.
SUMMARY
METHODS OF
CALCULATION OF THE CONSUMPTION OF SPIRIT AND SOFTENED WATER FOR PRODUCTION OF
ALCOHOLIC BEVERAGES
Maspindzelashvili B.I.
Georgian
Technical University
The
methods of calculation of the consumption of spirit and softened water for
production of some alcoholic beverages were developed. The developed methods
are distinguished from available ones in simplicity and precision, justified in
practice.
Keywords:
alcoholic beverages, spirit, softened water, consumption, calculation.
SUMMARY
METHODS OF
CALCULATION OF THE CONSUMPTION OF SPIRIT AND SOFTENED WATER FOR PRODUCTION OF
ALCOHOLIC BEVERAGES
Maspindzelashvili B.I.
Georgian
Technical University
The
methods of calculation of the consumption of spirit and softened water for
production of some alcoholic beverages were developed. The developed methods
are distinguished from available ones in simplicity and precision, justified in
practice.
Keywords:
alcoholic beverages, spirit, softened water, consumption, calculation.
SUMMARY
POLYMERIC COMPOSITION FOR LOWER PARTS OF CHILDREN’S ORTHOPEDIC FOOTWEAR
Shalamberidze M.M., Grdzelidze M.G. and Tatvidze
M.L.
Akaki Tsereteli State University,
Kutaisi
The article
deals with physico-mechanical properties of the
styrene-butadiene composition based on a latent hardener and sulfur vulcanizates. It was established that the use of latent hardeners
in styrene-butadiene rubber produced more elastic and softer footwear materials
than the use of sulfur vulcanizates of corresponding
rubber. This is a promising trend in designing of children’s orthopedic
footwear.
Keywords:
orthopedic footwear, polymeric composition, styrene-butadiene rubber, latent
hardener.
SUMMARY
THE
PROBLEMS OF AUTOMATED DESIGNING OF THE SPACE FORMS OF LASTS
Grdzelidze M.G., Shalamberidze M.M. and Purtskhvanidze
G.N.
Akaki Tsereteli
State University, Kutaisi
The article
deals with the problems of automated designing of orthopedic lasts.
Keywords:
footwear,
last, orthopedic footwear, automated designing.