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Physics, mathematics, and technology

Mathematics and computer science

Normalization of the basic structural subbundles of the H(, L)-distribution of affine space

Abstract

The author pioneers to study a special class of the grouped hyperplane distributions — the H(, L)-distribution of affine space. He introduces Bompiani — Pantazi correspondences associated with the main structural subbundles of the H(, L)-distribution of affine space. Norden’s normalizations of the main structural subbundles in the differential 1st and 2nd order neighbourhoods of H(, L)-distribution are constructed.

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Information technology in enhancing the effectiveness of municipal authorities

Abstract

Modern education requires different approaches to improving the efficiency of services for citizens in the public information centers. The article focuses on the methodology for a queue processing and, in particular, on automatic query distribution. The authors developed a system of management quality assurance.

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A sample assessment of the constellation form influence on noise immunity for reception of the QAM-8 radio signal in the Matlab environment

Abstract

The study of signals with quadrature-amplitude modulation is an urgent task due to their wide application in the satellite television broadcasting systems, as well as for the communication channel of the INMARSAT satellite communication system and the Sirius satellite. The paper presents the results of a study, when an experimental facility was assembled to assess the probability of receiving bit error for a QAM-8 radio signal, depending on the type of signal constellation for different SNRs in the MathLAB + Simulink simulation environment. The results of the research, as well as the developed experimental facility, will be used in the comparative assessment of noise stability of the radio communication channel using standard and prospective patented information transmission systems within the maritime mobile service when receiving radio signals with QAM modulation.

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Ways to optimize the characteristics of active synthesizers frequency

Abstract

The purpose of this work was to summarize the existing experience and approaches to software development and create the methodology for a software product development for the aviation industry. The current research was based on the systemic analysis and the theory of statistical estimation. This work primarily deals with theoretical methods of research which were used to identify approaches to the mathematical description of atmospheric phenomena models of wind shear, turbulence. The author also analyses relevant the optimal methodology (Russian and foreign papers) for developing software products which takes into account the authors own experience obtained in the process of work at the Russian aerospace industry enterprises.

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System analysis and methodology for developing a software product of a mathematical model of physical processes for the aviation industry

Abstract

The method of closed chains of discrete symmetries is used to multiply Toda lattices in one and two spatial dimensions. Using the modified Toda equations m0TCand m1TC as an example, it is shown that the combination of the Darboux and Schlesinger transformations leads to closed dressing chains.

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Theoretical and experimental physics

Metalanguage for hybrid intelligent systems of electrical networks visual control: problems and models

Abstract

The paper presents a description of three levels of visual meta-language developed for hybrid intelligent systems of electrical networks management: 1) tasks and problems; 2) patterns for expert reasoning; 3) integrated models of collective intelligence. Visual metalanguage qualitatively changes the work mode of a managed subject, allowing them immediately to recognize the problematic situation and «see» its solution without logical inferences.

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Non-contact method for measuring the specific electrical resistance of liquid metals in the high temperature range

Abstract

The article offers a new, non-contact method of measuring the specific electrical resistance of liquid metals in the high-temperature range, which is exceptionally simple. The essence of the method is the measurement of the electromotive force induced by a high-frequency electromagnetic field in two circuits of different diameters placed coaxially in the middle of a cylindrical sample, which is a thin-walled ampoule filled with some low-melting metal. The authors substantiate the feasibility of a contactless method for measuring the specific electric conductivity of both solid and liquid metals in the hightemperature range. Result-processing methodology is given as well as the recommendations on the optimal geometry of the contours and the sample for increasing the measurement accuracy.

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Mechanics

Seven stages of ADC connection for effective analog-to-digital conversion, minimizing noise elements

Abstract

High-frequency transformations require to correctly design the gain unit before the analog-to-digital converter. To achieve the optimum signal-to-noise ratio, you need to select the correct ADC, and also configure the circuit to receive the signal. The authors focus on several stages for successful conversion of an analog high-resolution signal.

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