SUMMARY
Кутелия Е.Р., Дзиграшвили Т.А., Кутелия Б.Е., Демиркиран К., Кукава Т.Г.
Грузинский технический университет
В самом начале распада мартенсита в углеродистой стали карбидная фаза имеет структуру кристалла цементита. Эта структура формируется в несколько этапов во время преобразования тетрагональной решетки мартенсита в решетку цементита в соответствии с механизмом Багаряцкого без образования промежуточного гексагонального
e -карбида. Кристаллические структуры и морфология фаз изучались с помощью просвечивающей электронной микроскопии высокого разрешения, метода темного поля, электронных изображений дифракции, смоделированных на компьютере, быстрого преобразования Фурье для моделирования оптических аналогов диффузного рассеяния и прямого наблюдения за процессами в колонке микроскопа.Ключевые слова: мартенсит, цементит, распад, диффузное рассеяние, моделирование, ориентационное соотношение.
SCATTERING OF A PLANE ELECTROMAGNETIC WAVE AT A HOLLOW METALLIC FINITELY-LONG CYLINDER
Kevanishvili G.Sh., Kevanishvili R.G., Kokaia P.V. and Kotetishvili K.V.
Georgian Technical University
The analytical expression for the scattering characteristic of a hollow metallic finitely-long cylinder at incidence of a plane E-polarized wave is introduced. The numerical results are presented.
Keywords: scattering, directivity diagram, cylinder.
ANALYSIS OF A LINEAR ANTENNA WITH A PLANE REFLECTOR
Kevanishvili R.G., Kekelia G.V. and Kokaia P.V.
The strict theory of a thin active linear antenna with a plane reflector has been developed. The correct solution of the integral equation for linear current at the antenna surface has been obtained.A new expression for antenna directivity has also been obtained.
Keywords: antenna, integral equation, reflector.
DIFFRACTION OF A PLANE ELECTROMAGNETIC WAVE AT A SPHERICAL SHELL
Zamtaradze G.G., Kevanishvili G.Sh. and Kekelia G.V.
Georgian Technical University
The prolem of diffraction of a plane electromagnetic wave at a spherical dielectric shell has been solved. Explicit equations for the components of a scattered wave electric field have been derived. The obtained results can be used when designing antenna fairings and calculating an electromagnetic field in biological cells.
Keywords: scattered field, Debye potentials, electric field components, pattern.
PRACTICAL WAY OF CALCULATING THE FREELY-SUPPORTED RECTANGULAR PLATE
Danelia D.K., Madzagua Z.K. and Tskhvedadze R.M.
Georgian Technical University
A practical way for determination of parameters characterizing the tense-deformed condition of a freely - supported rectangular plate under evenly distributed load is offered.
Keywords: freely-supported rectangular plate, maximum sagging, calculation.
COMPARATIVE ANALYSIS OF NOISE REDUСERS BASED ON
TELEVISION (TV) SIGNAL AVERAGINGKurtanidze G.G. and Vekua T.A.
Georgian Technical University
The comparative analysis of digital TV noise reducers based on TV signal averaging has been carried out. It is shown that, from the existing noise reduction methods, recursive noise reducers with interframe (timebase) averaging are optimal as applied to broadcast TV signals.
Keywords: digital television, noise reduction, recursive filtration.
COMPARATIVE EFFICIENCY ESTIMATION OF DISCRETE COSINE AND WALSH TRANSFORMATIONS
Abuladze V.Sh.
The efficiency of considering the structural properties of Walsh transformation coefficients in the systems of effective image signal digital coding has been studied. It has been proved that consideration of the mentioned properties of the Walsh transformation coefficients gives better results (from the point of view of the recovery mean-square error) in comparison with the discrete cosine transformation stipulated by the MPEG standard.
Keywords: effective digital coding, discrete cosine transformation, Walsh transformation.
ANALYTICAL DESIGN MODEL FOR MULTIMODAL INVESTIGATIONS OF NONLINEAR OSCILLATIONS OF CONTINUAL SYSTEMS
Mukhadze L.G., Japaridze G.M. and Tkeshelashvili Tz.S.
K. Zavriev Institute of Building Mechanics and Earthquake Engineering
A continual system design method based on the Hamilton principle using ficticious loods that allows to avoid finding the nonlinear determinants proper values is offered. According to this method, the investigation of nonlinear natural and constrained oscillations of cylindrical and spherical shallow shells under different boundary conditions has been carried out. The neccessity in high harmonics consideration is revealed in both shell types when they support at the elastic contour. The fundamental tone of the oscillations is not the first in order, and the frequencies of the fundamental and nearest modes are highly close to each other. The offered model can be used for dynamic stability estimation of other types of the continual systems in which the consideration of oscillations high modes is neccessary.
Keywords: nonlinear oscillations, skeleton and resonance curves, dynamic stability, multimodal analysis.
COMPUTERIZED SUPPORT OF DECISION-MAKING IN WATER-SUPPLY SYSTEMS
Prangishvili A.I., Chkhenkeli B.J. and Tsikhelashvili Z.I.
Georgian Technical University
Georgian Engineering Academy
A scheme of decision-making in the problems of planning and predicting the water-supply system process is suggested. On the base of generating the cognitive charts, the hypothetical model of determining the dynamics of water-supply system operation and estimating qualitatively the effect of separate parameters on the system stability in whole has been constructed.
Keywords: water supply, cognitive charts, control, prediction.
INDISTINCT MODEL IN WATER-SUPPLY SYSTEM PROCESS CONTROL
Prangishvili A.I., Chkhenkeli B.J. and Tsikhelashvili Z.I..
Georgian Technical University
Georgian Engineering Academy
A scheme of generating the decision-making system with indistinct logic for water-suppy system process control and a procedure for creating the descriptive models both for separate components and a whole set of jointly operating components of the water-supply system are suggested.
Keywords: indistinct models, water-supply system, process control.
ON CALCULATING THE PARAMETERS OF THE MULTYLINK ACTUATORS SYSTEM OF A MANIPULATING ROBOT
Nioradze G.G., Mchedlishvili T.Ph. and Tavkhelidze D.D.
Georgian Technical University
The system of differential equations describing the mulilink actuators system of a manipulating robot with electrohydraulic actuators has been set up. The methods for synthesis of the controlled parameters by the given transient processes are offered.
Keywords: manipulating robot, multilink system, actuators, system of equations.
ON THE METHODS FOR SYNTHESIS OF THE MANIPULATING ROBOT EXECUTIVE CONTROL SYSTEM
Nioradze G.G.
Georgian Technical University
The methods for synthesis of the correcting members parameters in the manipulating robot multilink executive system with electrohydraulic actuators of motion by separate coordinates are considered.
Keywords: manipulating robot, synthesis, executive system.
ON THE THEORY OF A SPIRAL GAS-LIQUID PUMP
Saginadze I.S., Tvalchrelidze A.K. and Adamia G.K.
Kutaisi Technical University
A quasi-static theory of a gas-liquid pump is considered. Basing on the theory, it is possible to study the internal processes of the pump in transient and steady-state conditions without regard to dynamic effects, to calculate the integral characteristics, and to solve the optimization problems.
Keywords: gas-liquid pump, spiral, theory.
ON PREDICTION OF THE VEHICLE FLEET DEVELOPMENT
Kharitonashvili V.A. and Ratman A.S.
Georgian Technical University
The methods for predicting the vehicle fleet number with the help of the function taking into account the initial data on the fleet before the stabilization of the country economy are offered. The process of transformation of the initial vehicle bodies distribution (by their types) into the rational one is predicted.
Keywords: vehicle fleet, prediction, calculation.
ON A TWO-SECTION DESIGN OF A PLANETARY-TYPE INERTIAL PROPELLER
Partskhaladze R.M. and Kapanadze Z.G.
Georgian Technical University
The design of a planetary-type inertial propeller for a vehicle is offered. The design allows to transform motor torque into pushing forces directly applied to the vehicle body, and so ensuring the asymmetry of the total inertial force longitudinal component. Development of total power irrespectively of the vehicle speed simplifies the transmission design and improves the traffic safety.
Keywords: vehicle motor, transmission, inertial propeller, design.
A MATHEMATICAL MODEL OF THE REPEATED VIBRATION INFLUENCE ON THE STRENGTH OF CONCRETE WARES
Samkharadze Z.Z. and Lashkhi A.A.
Georgian Technical University
The regression of concrete strength depending on the concrete class, the amount of admixture and the interval of repeated vibration are presented. The optimal values of these parameters are found.
Keywords: concrete, strength, repeated vibration, function optimum.
A CALCULATION METHOD FOR DESIGNING THE HEAVY CONCRETE OPTIMAL COMPOSITION
Samkharadze Z.Z. and Verbetskaja O.N.
Georgian Technical University
A new calculation method for designing the heavy concrete composition is offered instead of a common cut-and-try method with repeated calculations and experimental tests of the samples. The method is based on the use of the data on the rated water consumption of the concrete mixture materials, on the rule of the "Concrete Mixture Water Consumption Constancy", well-known in the concrete technology, as well as on the fundamental formula of absolute volumes.
Keywords: concrete, composition, design, water consumption.
НЕКОТОРЫЕ АСПЕКТЫ ПОЛУЭМПИРИЧЕСКОЙ ТЕОРИИ ВОСХОДЯЩЕГО ТРЕXКОМПОНЕНТНОГО ПОТОКA В ЭРЛИФТАХ
Нацвлишвили Г.М.
Грузинский технический университет
Разработана полуэмпирическая теория для описания вертикально восходящего трехкомпонентного потока. В основе теории лежит положение, что трехкомпонентная смесь (жидкость, газ, твердые частицы) представляется как двухкомпонентная (несущая жидкость, газ). При этом несущая жидкость представляется
как смесь жидкости с твердыми частицами. Теоретические положения подтверждены экспериментально.Ключевые слова: трехкомпонентный поток, эрлифт, теория, эксперимент.
ON TRUE GASCONTENT AT ASCENDING SLUG MOTION OF A THREE-COMPONENT MIXTURE IN A VERTICAL PIPE
Natsvlishvili G.N.
Georgian Technical University
A hypothesis for resolving the semiempirical theory of an ascending three-component mixture in a vertical pipe is advanced. The essence of the hypothesis is as follows: the three-component mixture (liquid, gas, solid particles) is presented as a two-component one (carrier media, solid particles). The hypothesis has been verified experimentally.
Keywords: vertical pipe, true gascontent, three-component mixture, motion.
ON THE POSSIBILITY OF IMPROVING THE STAY CABLEWAY
Khatiashvili K.V.
Institute of Mining Mechanics
The essence of the mathematical model for calculating the main parameters of a stay cableway (with account of the advantages and the drawbacks of the G.Mueller's "Aerobus") is expounded. The prospects of employing the stay cableway are considered.
Keywords: stay cableway, binder, trajectory, straightening, stiffness.
ON DETERMINING THE CHIP CONTACT LENGTH "BY A CUTTING TOOL"
Abuladze N.G.
Georgian Technical University
The causes of the error at determining the chip contact length "by a cutting tool" are considered. To improve the error, using of the composite cutter as a cutting tool is suggested.
Keywords: metal cutting, chip, contact length, error.
PHOSPHOROUS ION IMPLANTATION INTO ZINC SULPHIDE
Butkhuzi T.V., Kekelidze N.P., Sharvashidze M.M., Chikoidze E.G., Trapaidze L.T.
and Aptsiauri L.G.
I. Javakhishvili Tbilisi State University
The samples of zinc sulphide implantanted with phosphorous ions are considered. The dependence of the implanted layers resistance on the annealing temperature has been established. The ZnS samples with p-type conductivity have been produced. Ionization energy of the acceptor impurity centre of phosphor in zinc sulphide has been determined.
Keywords: zinc sulphide, implantation, phosphor, electrical resistance.
ВЛИЯНИЕ ДОБАВКИ СаО НА СВОЙСТВА СВЕРХПРОВОДЯЩЕЙ YBa
2Cu3O7-D КЕРАМИКИДжгамадзе В.В., Маргиани Н.Г., Мжаванадзе И.А., Сабашвили Н.Г., Шургая Г.А., Табидзе Б.А., Цинцадзе Г.А.
Институт кибернетики АН Грузии
В настоящем сообщении рассматривается влияние добавки СаО на свойства сверхпроводящей YBa
2CaxCu3O7-D керамики. Критическая температура в YBa2CaxCu3Oy системе снижается с увеличением х от 88,7К (х=0) до 84,4К (х=0,4). Добавление СаО в YBa2Cu3O7-D улучшает условие транспорта заряда в нормальном состоянии.Ключевые слова: высокотемпературная сверхпроводимость, Y-Ba-Ca-Cu-O система, удельное сопротивление.
STRUCTURE FORMATION OF MOLECULAR SIEVES OF THE PHILLIPSITE TYPE
Tsitsishvili V.G., Dolaberidze N.M. and Tsiklauri I.Z.
Institute of Physical and Organic Chemistry
The structure formation of molecular sieves of the phillipsite type has been studied; the parameters of optimal reproduced hydrothermal crystallization of phillipsites in artificial aluminosilicon gels and in natural perlite suspensions have been determined. It is shown that the gel zeolitization direction signifiсantly depends on the cationic composition. For synthetic phillipsites the high adsorption index of alumimium cations has been proved.
Keywords: molecular sieves, zeolites, phillipsite.
АДСОРБЕНТЫ НА ОСНОВЕ МОДИФИЦИРОВАННЫХ ФОРМ АНАЛЬЦИМА
Цицишвили В.Г., Долаберидзе Н.M., Алелишвили М.В., Чипашвили Д.С., Цинцкаладзе Г.П.,
Стуруа Г.И., Нижарадзе М.О., Гиголашвили Н.Г., Мирдзвели Н.А.
Институт физической и органической химии им. П. Меликишвили АН Грузии
Путем кислотной (соляная кислота, концентрация растворов 0,1-5N) и термической (300-800
oС) обработки получены модифицированные формы анальцимов из месторождений Гелати и Чачубети (Грузия). Согласно результатам исследований, проведенных методами рентгенографии, ИК-спектроскопии, термического анализа и адсорбции воды и бензола, полученные материалы являются мезопористыми адсорбентами с достаточной адсорбционной емкостью.Ключевые слова: цеолит, анальцим, модификация, адсорбент.
THE MANGANESE CATION EFFECT ON THE CLINOPTILOLITE DEHYDRATION CAPABILITY
Kakhidze N.A., Kordzakhia T.N., Eprikashvili Z.G. and Andronikashvili T.G.
P. Melikishvili Institute of Physical and Organic Chemistry
The dehydration process of ethyl acetate and amyl alcohol, the compounds which form the part of mobile phases used in HPLC, is studied with the help of clinoptilolite tuff and its variation modified with manganese salts. It is shown that the nature of the cation (manganese) present in natural zeolite-clinoptilolite tuff and the nature of the solvent affect the dehydration properties of zeolites.
Keywords: solvent dehydration, clinoptilolite, adsorption.
Jashi T.O., Khoshtaria T.E., Mirzashvili N.T. and Sikharulidze M.I.
Georgian Technical University
For studying the chemical features of synthesized pyrrole-containing condensed systems-izomeric dioxindoline [5,6-d] - and dioxindoline [5,4-d] benzo [b] furans, the synthesis of b -thiosemicarbazones based on the above-mentioned compounds, which have not been described in literature, has been performed. It has been established that the mentioned thiosemicarbazones form in the mixture simultaneously in the form of two geometries: isomers having syn- and anti- configurations. It is shown that they can be used as potential new generation medicines.
Keywords: synthesis, isomers, thiosemicarbazones, dioxindolinebenzofurans.
Eradze N.N. and Bezhuashvili M.G.
Institute of Horticulture, Viticulture and Wine-Making
Pirogallol ether formation from oak pulp Quercus iberica while its thermal oxidation in the presence of air oxigen has been studied. On the base of the model reaction, it was established that the identified phenolic ether 2-etoxy, 1-hydroxy benzene was formed from vanilline.
Keywords: lignin, oak, phenolic ether, vanilline, identification.
IDENTIFICATION OF SOME AROMA-FORMING COMPOUNDS IN NUTS JUGLANS REGIA
Kurashvili N.Z. and Bezhuashvili M.G.
Research Institute of Horticulture, Viticulture and Wine-Making
Some aroma-forming compounds, in particular aromatic alcohol, fatty-aromatic ketone and terpene substance, were identified in walnuts (Juglans regia) by a combined method of gas-liquid chromatography and mass spectrometry. The presence of some fatty acids in the material was established.
Keywords: walnuts, aromatic alcohol, fatty-aromatic ketone, terpene compound, fatty acids.
SOME MECHANISMS OF FISH OIL CATALYTIC HYDRATION UNDER LOW HYDROGEN PRESSURE
Japaridze D.V. and Iashvili R.I.
Georgian Technical University
The process charts for fish oil refinement are offered; the process procedures for their realization are recommended. It is shown that the highest hydration rate is achieved after oil refinement by strong alkali in combination with adsorption cleaning and demetallization. It has been established that the relative hydration rate is closely depending on the alkali concentration, and that the fish oil selective hydration improves multiply the fish oil resistance to oxidation.
Keywords: fish oil, hydration, process chart, hydration rate.
HYDRATION OF THE FISH OIL-VEGETABLE OIL MIXTURE
Japaridze D.V. and Iashvili R.I.
Georgian Technical University
The hydration method for the mixture of fish oils and highly unsaturated vegetable oils is offered. The method allows to produce hydrogenated fats of high quality with a low content of trans-izomerized acids which can be successfully used in producing edible fats for margarine products.
Keywords: hydration, fish oil, vegetable oil, mixture, hydrogenated fats.
PALEOVOLCANIC CONDITIONS OF KAVART CHALCOPYRITE MINERALIZATION FORMING
Otarashvili M.V.
Caucasian Institute of Mineral Resources
The results of investigations (paleovolcanic, petrographic, mineralogic, thermobarogeochemical and isotopic) of Kavart guarry of Kafan deposit, which prove the existence of a paleovolcanic structure in late Bajocian-Bath volcanogenic sedimentary masses, are considered. The hydrothermal sedimentary metasomatic stage of ore-forming is dated by the middle of the Bajocian period. The laws of ore localization of Kafan deposit have been established, the perspectives of the deposit have been substantiated.
Keywords: Kafan deposit, Kavart quarry, paleovolcanic conditions, pyrite formation, extrusive edifice, perspectives.
К ВОПРОСУ ОБ ЭКОНОМИЧЕСКОЙ ПОЛИТИКЕ ГРУЗИИ
Квеселава И.С.
Грузинский технический университет
Рассматриваются некоторые результаты экономической политики в Грузии за последнее время, а также возможные пути для преодоления сложившейся ситуации и оздоровления экономики страны.
Ключевые слова: экономика, состояние, перспективы.
ON THE PROBLEM OF THE TRAINER'S AGE
Pleninger-Tavdidishvili A.G.
Georgian Academy of Physical Training and Sport
The results of the inquiry among sportsmen about the preferable trainer's age are presented. The majority gave their votes to a trainer whose age is from 30 to 50 years; the age from 35 to 40 years was the most preferable
Keywords: sport, trainer, age, relations, estimation.
ON THE INFLUENCE OF OAK WOOD THERMAL TREATMENT ON THE LIGNIN-POLYSACCHARIDE FRACTION
Darchiashvili N.G. and Bezhuashvili M.G.
Institute of Horticulture, Viticulture and Wine-Making
The influence of thermal treatment on the oak wood lignin-polysaccharide fraction has been investigated. It has been established that in the presence of air oxigen and under the influence of temperature, a part of polysaccharide combines with lignin, and forms an indivisible complex. The quality of combined polysaccharide depends on temperature and time. It changes from 1.7 to 15.1% within the 80-1300C temperature range.
Keywords: oak wood, thermal treatment, lignin, polysaccharide.
ON THE PROBLEM OF OPTIMAL ORGANIZATION OF THE CHEMISTRY STUDENTS' INDEPENDENT WORK
Gogonaia I.A. and Chirakadze G.G.
Sukhumi Branch of I. Javakhishvili Tbilisi State University
Georgian Technical University
Methods for organization of students' independent training-research activities on the small lab practical course in organic chemistry are offered. Three types of educational cards for organization and management of the above-mentioned activities are described.
Keywords: organic chemistry, educational cards, lab course, independent activities.
