Comprehensive study of the mathematical model of a service system has been carried out. The model is a system of interdifferential equations of the convolution type. That fact allows to use the Laplace (or Laplace-Styles) transform and to obtain all the service system characteristics in terms of operational calculus. The system operation stationary mode has also been studied; the necessary and sufficient condition of stationarity has been determined.

Keywords: service system, stationary characteristics, operational calculus, mathematical model.

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A mathematical model of the service system has been studied. The model is the system of interdifferential equations of the convolution type. That fact allows to use the Laplace (or Laplace-Styles) transform and to obtain all the service output characteristics in terms of operational calculus.

Keywords: service system, stationary characteristics, operational calculus, mathematical model.

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The problems of mathematical modeling of a piezoid in a control system are considered. A mathematical model of the piezoid which is a rectangular parallelepiped has been developed.

Keywords: piezoid, control system, mahtematical model.

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The thermoelectroelastic state of piezoid shaped as a rectangular parallelepiped is considered. Its mathematical model has been developed. For that model, the corresponding boundary problems have been solved.

Keywords: piezoid, thermoelectroelastic state, mathematical model.

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Differential dependences of angles of twist and torsional moments and of laternal forces and bending moments are considered. Determination of the angles of twist is reduced to determination of the bending moments by analogy of the fictitious concentrated forces and the torsional moments and of the fictitious load distribution intensity and the distributed torsional moment. For realization of that idea, the tables of given and general systems with respect to loads of various types have been drawn up.

Keywords: bending moments, angles of twist, equation, analogy.

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The correct solution of the dispersion problem for a wavequide with triangular cross-section has been obtained.

Keywords: wavequide, triangular cross-section.

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A strict electrodynamic theory of an antenna dome which is a spheric dielectric shroud, in the centre of which a passive vibrator (a dipole) is placed, is offered. A formula for calculating the dipole output resistance has been derived.

Keywords: antenna, dipole, shroud, theory.

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The problem of diffraction of a plane electromagnetic wave at metallic, dielectric, coaxially metal-dielectric and coaxially dielectric spheres is considered. Explicit equations for scattered field coefficients in each region have been derived. That ensures both finding the scattered field in the entire physical region and plotting the directivity diagram in the distant zone.

Keywords: diffraction, plane wave, spherical inhomogeneity, scattered wave coefficient, directivity diagram, calculation.

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A problem of the H₁₀ principle wave diffraction at an arbitrary number of "windows" is considered.. The theoretical solution of the problem under consideration is presented. The problem has been brought to a system of algebraic equations of the Fredholm type of the 11th to 20th kind, that makes possible its computer-aided solution by a reduction method..

Keywords: diffraction, H₁₀ wave, waveguide, system of "windows", scattered field indices, radio-frequency filter.

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Calculation of radiation patterns for a triangular panel antenna of a prismatic design is presented.

Keywords: antenna, dipole, reflector, prismatic design.

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Formulation of the boundary problem of the model of producing the two-axes oriented sleeve film by an extrusion-distension method is presented.

Keywords: mathematical model, polymer film, distension.

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A numerical algorithm for a quasi-static model of a spiral gas-hydraulic pump is described. Some results of a computing experiment are presented.

Keywords: spiral pump, algorithm, computing experiment.

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Some problems of system analysis, evaluation and provision of chemical-engineering system reliability have been studied. As the most general approach, application of stochastic marked point processes (SMPP) as mathematical models of reliability is offered. The commonest specific cases of SMPP are considered.

Keywords: chemical-engineering system, reliability, simulation, mathematical model, stochastic marked point processes.

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A possibility of employing the spatial-time modulator designed on the base of the Weigert effect in an optoelectronic processor was investigated. The investigation showed that application of a polarly sensitive medium as the spatial-time modulator allows to significantly simplify the processor optical circuit design. Such kind of the modulator is multifunctional, very simple, homogeneous along the entire field; it has high resolution (more than 10² bit/cm²) and does not need electric power supply. The main drawback of the device is the high transit-time effect that is associated with low photosensitivity of the photoanisotropic material. The work on eliminating this drawback has been carried out.

Keywords: optoelectronic processor, Weigert effect.

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A conception of robotic system construction for selective tea picking, which is based on application of a vision system and a vehicle-borne computer. By this system automatic control of the depth of cutting module immersion into the raw material layer and its special stabilization are performed. The work has been carried out with assistance of companies Martin Bayer (Germany) and Charlestone Tea Plantation (the USA).

Keywords: tea, selective picking, robotic system.

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The sensor of signals emitted by biosystems is considered. The procedure and the block diagram for taking an auragram with the help of the semiconductor sensor are presented. The obtained results can be used at designing the equipment for early diagnosis of biosystems.

Keywords: biosystems, sensor, auragram.

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The reaction of electrophilic substitution of 3H-pyrrole [2,3-c] phenolxathin-11,11-dioxide with various aminocontents is studied on the example of the Mannich reaction. It is shown that, in contrast to indole, the position of the substituent depends on the size of its molecule.

Keywords: physiologically active compounds, 3H-pyrrole [2,3-c] phenolxathin-11,11-dioxide, synthesis.

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Complexes of Zn have been prepared by reacting zinc phormiate with a - amino – 4 – methylpyridine (L) and a - amino – 5 - methylpyridine (L') in an aqueous medium of formulae 2Zn(HCOO)₂ ^. L ^. H₂O and 2Zn(HCOO)₂ ^. L' ^. H₂O. The infrared spectra of the complexes were analysed in relation to their structures. From the IR spectra it follows that ring N of L is bound to the zinc ion, whereas L seems to be bound by the NH₂ group.

Keywords: a - amino – 4 – methylpyridine, a - amino – 5 – methylpyridine, zinc phormiate, infrared spectra, electronodonor, substitutes in the pyridine ring, complexes.

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Complexes of Ni(II) have been prepared by reacting nickel (II) phormiate with 2-amino-4-methylpyridine (L) and 2-amino-5-methylpyridine (Lў ) in an aqueous medium of formulae Ni(HCOO)_2Ч LЧ H₂O and Ni(HCOO)_2Ч 4Lў Ч 4H₂O. The infrared spectra of the complexes were analysed in relation to their structures. From the IR spectra it follows that the N ring of L and Lў is bound to the nickel (II) ion.

Keywords: 2-amino-4-methylpyridine, 2-amino-5-methylpyridine, nickel (II) phormiate, infrared spectra, isomers nature, pyridine ring, complexes.

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It is shown that the product of thermolysis of alkyl ethers of ethyleneglycolarsenous acid is high-purity metallic arsenic which can be used for production of the A^IIIB^V type semiconductor devices.

Keywords: thermolysis, alkyl ethers, ethyleneglycolarsenous acid, arsenic.

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The energetic-electronic and structural characteristics of Cope rearrangement were calculated by means of modern semiempirical quantum-chemical method AMI. It was shown that the process went on by the mechanism of fragmentation – recombination through radical intermediates.

Keywords: 3,4-dimethylhexadien, Cope rearrangement, mechanism, quantum-chemical characteristics, calculation.

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A method of theoretical investigation of biological activity of analgesics was elaborated within the scope of the quasi-ANB-matrices method.

Keywords: analgesics, activity, quasi-ANB-matrix.

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Preparation of lignin extracted from a Kakheti-type wine by the Browns method were studied. Basing on spectral and chromatographic analyses, the presence of lignin and its localization after alcoholic fermentation of grapes were established.

Keywords: wine, lignin, analyses.

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A number of methods for extracting biologically active substances out of shelf-life rocket fuel (triethylamine, xylidine) has been developed. The following compounds have been extracted: (CH₃)₂C₆H₃NHCH₂CH₂NHCOOC₂H₅, (CH₃)₂C₆H₃NHCOCH₂N(C₂H₅)_{2 Ч} HCl, (CH₃)₂C₆H₃N=CHNH(CH₃)₂, (CH₃)₂C₆H₃NCHN(CH₃)₂. The above - mentioned products have insecticide, anaesthetic and juvenile properties.

Keywords: rocket fuel, triethylamine, xylidine, utilization, biologically active substances.

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Testing modeling, game and demonstration computer programs on the subject "The Periodic Law and the Periodic System of Chemical Elements" are offered. The programs have been tested in chemistry lessons at secondary schools of Tbilisi.

Keywords: computer educational program, chemistry, periodic law.

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The results of investigation of the detoxication process of exogenic 1-6-¹⁴C-hydroquinone in white rats are presented. It has been established that, along with the conjugation mechanism, the aromatic ring degradation also plays an important role.

Keywords: metabolism, hydroquinone, detoxication, conjugation.

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Basing on the results of examination of more than 1500 patients by the original technique with the use of the software-hardware complex of Prof. K.G. Korotkov, the authors advance new vision of the origin and the development of cancer, which brings to the forefront energo-informational factors.

Keywords: bioenergetic study, cancer, tumor, formation mechanism, hypothesis.

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Self-organization of material structures from physical, chemical and biological ones to a social system is considered from the positions of the energy and information unity conception and the complex determination of self-organization of the energy and information work of matter. Global cyclic regularity of the local space and time superimposition in the energy and information work of matter is shown. It is suggested to measure it in electronvoltЧ bits.

The described cyclic regularity significantly broadens the knowledge about the matter self-organization, makes earlier knowledge more precise and can be the answer to the scientific question about the origin of life: "How the space disconnection and the processes that seem not to be associated with each other could unite into unified processes of metabolizating systems?".

Keywords: matter, self-organization, cyclic regularity.

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The problems associated with production and consumption of fuel and power products in Georgia are considered. It is stated that recently the production and the consumption of the mentioned products have sharply decreased at their acute shortage.

Keywords: fuel and power products, production, consumption.

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The possibilities of the hydropower potential of Georgia are considered. The reason why the capacities of the existing hydroelectric power stations has not been utilized fully is financial pressure, overcoming of which will significantly increase the total capacity of the hydroelectric power stations.

Keywords: hydropower potential of Georgia, state, possibilities, prospects.

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Factor-by-factor analysis of three alternatives of town-planning development of Tbilisi: further growth of the city, its stabilization and its reduction, has been carried out. Comparing the results of the prognosis of the city development the author gives preference to the third alternative, i.e. to reduction of the city population, intensification of the territory utilization, and usage of the available town-planning reserves.

Keywords: town-planning, urbanization, comparative analysis, reconstruction.

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The conception of cyclic change of phases of evolutionary, revolutionary and involutionary development of Tbilisi urban sprawl as an example of an urban macrosystem is considered. The conception of town-planning of Tbilisi, which includes the principles of city reurbanization, optimization of planning parameters and stages of town-planning design, has been developed.

Keywords: town-planning, reurbanization, involution, development optimization, design.

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It is shown that the value of the angle of slope of the magnetic axis of the Earth is of great importance in damping processes of the magnetosphere.

Keywords: magnetic axis, magnetosphere of the Earth.

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A formal-algebraic model of synchronous functioning of endocrine glands has been elaborated within the scope of the theory of graphs.

Keywords: endocrine glands, pseudocontiguity matrix.

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Principal problems of industry development in Georgia are considered. The Indicative Plan of Economic Development is briefly evaluated. The possibilities of foreign investments are considered.

Keywords: industry development, system, indicative plan, investments.

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Some aspects of economic cooperation of Georgia in the frame of the organization of the Black Sea basin countries, i.e. the Black Sea Economic Cooperation (BSEC), are considered. A brief history of forming the BSEC and the role of Georgia in it are described.

Keywords: economy, cooperation, BSEC.

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Planning parameters of three main kinds of dwelling buildings of Tbilisi were studied in order to reveal the most promising reserves of town-planning development of Tbilisi. In the work the necessity of reconstruction of individual few-storey domestic buildings and degraded notpromising industrial and warehouse areas as the most capacious town-planning reserves is substantiated.

Keywords: town-planning, reserves, dwelling building, reconstruction, number of storeys, density of buildings.

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Stages of development of mechanics, machine-building and railway transport are briefly described.

Keywords: mechanics, transport, stages of development, history.

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