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.