The estimation of the modern ecological state of the Azov Sea is considered. For evaluation, a specific combinatorial water pollution index is used, an element is revealed, a sharp increase in the annual average concentrations of which leads to a negative effect on the ecological state. The influence of elevated aluminum concentrations in natural water and environmental degradation on human health is assessed.

Keywords: Maximum allowable concentration (MPC), specific combinatory index of water pollution (UKIZV), water quality, aluminum, human health, neurotoxin, Azov Sea

The characteristics of amplifiers on resonant-tunnel diodes (RTDs) are analyzed using the method of approximation to them and operating at frequencies close to resonant. It was revealed that the nonlinear and resonant properties of the amplifier on the RTD are related and determined from each other; the nonlinearity of the current-voltage characteristics of the RTD imparts a resonant curve to the form that usually occurs in the case of nonlinear reactivity. It is established that for large signals it is necessary to take into account the frequency dependence, which will complicate the course of the resonance curves. In this question, the most complete equivalent RTD scheme without simplifications.

Keywords: amplifier on resonant-tunnel diodes, equivalent circuit, amplitude-frequency characteristic, instability region, oscillatory characteristic, regeneration parameter

Electrotechnical devices starting processes short analysis is done including limited power autonomous system. The electrical installation starting processes with thermistor rheostats character depend on considered and formulated number of restrictions. The graphic depending’s are given characterizing different start models. The recommendations are given to form optimal starting processes with rheostats built on semiconductors polycrystalline thermistors.

Keywords: semiconductor thermoresistance, electrical installation, starting current, starting model, starting rheostat, starting processes dynamics

An experimental study of two instances of low-noise amplifiers of the range 1.5-2.0 GHz is carried out. The following results were obtained: the amplification gain varies from 24 to 37 dB in the frequency range; the maximum output power was not less than 10 mW (10 dBm); the compression point of 1 dB is achieved with an input power of minus 16 dBm. To illustrate the measurement results, two amplitude-frequency characteristics and an amplitude characteristic of the second specimen are given. The main element of the studied amplifier is a chip of the type MAAL-007304.

Keywords: Microwave power amplifier, decimeter waves, amplitude-frequency characteristic, experiment, microcircuit

A review of the serial microwave detectors of AEROFLEX company was conducted. Parameters of 116 detector models are considered. The features of AEROFLEX products are noted, including wide frequency range, high sensitivity, harsh operating conditions, a variety of design, including coaxial and strip type.

Keywords: detector, voltage sensitivity, tangential sensitivity, standing wave ratio, non-uniformity of the transfer characteristic, offset, overload protection

The article illustrates the problem of measuring the speed glider component targets in the presence of a turboprop effect of the reflected signal in a pulse-Doppler radar, proposed a model turboprop signal component and an algorithm for its suppression

Keywords: spectrum; radar; echo signal; turboprop effect; gliding component, micro-Doppler, radar

The article presents the results of simulation of the microstrip microwave structure of the ring configuration, which, by analogy with the fiber-optic prototype, embodies the principle of Fano resonance formation. This type of resonance is characterized by the asymmetry of the shape and has a narrower resonance than the classical Gaussian and Lorentzian forms.

Keywords: Ring resonator, Bragg reflection, Fano resonance, phase shift

In this paper, we study the frequency dependence of the inductor with a ferromagnetic core in the sound frequency range. Based on the measurements made, a replacement circuit for the coil is constructed, taking into account the active losses due to magnetic hysteresis, as well as the capacitive component of the current appearing at higher frequencies. The method of determining the parameters of the substitution scheme is given in the article, which, due to the complexity of the mathematical model, was determined by statistical averaging of the solutions of systems of nonlinear equations. Conclusions are made about the practical application of this substitution scheme in electronic devices.

Keywords: substitution scheme induction coil, frequency dependence of the impedance of the induction coil, active losses in the core

Dynamic memory devices are designed to generate a sequence of copies of a pulsed radio signal with a specified delay time. Such controllable devices can be considered as delay lines with a variable delay time and can be used in various signal processing systems. The results of statistical modeling of the influence of the parameters of couplers on the identity of the formed copies in a dynamic memory device with a binary fiber-optic structure are presented. The possibility of increasing the copy identity is proved by sorting the existing couplers when installing them into a binary fiber-optic structure. With a cascade number of more than 7, an increase in the identity of the copies is possible even when compared with the use of ideal couplers.

Keywords: dynamic memory device, binary structure, copy identity, coupler, tap coefficient

In article the developed circuitry decision with high response characteristics of the multistage programmable attenuator very high frequency of power on the basis of low-sized microstrip elements and heterojunction GaAs HEMT of structures is considered. The main aspects of design and functioning of the diagram are described. Results of simulation mathematical modeling are given in a software package of Microwave Office.

Keywords: MMIC, low-sized microstrip structures, programmable attenuator, heterojunction, HEMT, GaAs, Microwave Office.

The authors examine the peculiarities of fiber-optic cable electric parameters changes under the influence of a strong homogeneous alternating electromagnetic field. Variants of the process which can be used to describe the influence of the electromagnetic field on the fiber-optic cable are proposed.

Keywords: Fiber optic cable, electrothermal degradation, kevlar, electrical conduction

The serial peripheral interface (SPI) based on current logic, in which due to current mirrors stable to voltage supply and operation of transistors in the active mode, increased reliability and resistance to destabilizing factors are considered. The circuit design of D-flip-flops and the results of simulation on a 0.25 μm CMOS process are given. In the developed device, current consumption adjustment is realized with an external resistor, and external load resistors allow to select the necessary amplitude of the output signal.

Keywords: current logic, SPI, serial peripheral interface, linear algebra

In the article the possibilities of a modern system with numerical control FMS-3000(3200) compared to other common control racks. Given the specific production examples of the design of control programs for cases odnostoronnego and multilayer milling in power engineering. The analysis of the total length of programs and the complexity of their adjustments in the processing elements of the same type having different geometric dimensions. It is concluded that the use of specialized modal cycles in the control FMS-3000(3200) significantly increases the efficiency of program-controlled machining.

Keywords: system with numerical control, master control, machining, adjustment programs, technological equipment, routine, parameterization, multi-layered milling

Classification of heuristic methods for finding new solutions is presented. The classification is based on the hierarchical relationship of heuristic methods, based on their practical use. According to the proposed classification, heuristic methods are divided into three groups: methodological, systematic and empirical.

Keywords: classification, heuristic method, invention, hierarchy, interconnection

The paper contains the results of investigation of effectiveness of application of various models oriented towards interval time series (ITS) to forecasting behavior of gas distribution networks (GDS) parameters involving the real data obtained during the process of their continuous control. The necessity of taking into account the factor of seasonality caused by periodic fluctuations in the level of the corresponding variable is justified. A comparative analysis of the properties of the special interval modification of the model based on exponential smoothing, neural network and hybrid prediction models in relation to the ITS with seasonality is performed, their merits and demerits are noted.

Keywords: interval-valued time series, exponential smoothing model, neural model, long short-term memory, hybrid model

In this article, the actual task of automating the working processes for the design of offshore oil and gas facilities is considered. Developed software packages are provided that allow to provide higher quality of work, to shorten the development time due to automation of routine operations and the process of obtaining output documentation, as well as its operative updating and reissue when making changes.

Keywords: Bentley MicroStation, 3D modeling, offshore oil and gas facilities, design.

The questions of mathematical interpretation of results of trajectory measurements are discussed in terms of increasing the accuracy of identification of bearings of unmanned aerial vehicles during their movement in a "swarm" - a group. Variants of identification of horizontal and spatial bearings are offered. For each of the variants, criteria are proposed for identifying the belonging of the measured values ​​to the same object in the group and the conditions for achieving them. The situation of false positives is shown. It is determined that additional identification measures are needed to eliminate false bearing triads and uncovered ambiguities, including the use of combinatorial exhaustive search algorithms. For their study, it is necessary to develop an experimental statistical model with an algorithmic description of cause-effect relationships, which is a further development of this work.

Keywords: " unmanned aerial vehicle, group of objects, bearing identification, horizontal bearing, spatial bearing, identification criteria, false notch"

The problems of studying the mathematical interpretation of the results of trajectory measurements in terms of increasing the accuracy of identification of bearings of unmanned aerial vehicles during their movement in the group "swarm" and "system" are discussed. The variants of identification of horizontal (IHP) and spatial bearings (PPI) are proposed both separately and in a complementary application. Identification of bearings of similar objects in the swarm type group is expedient to be carried out according to the IGP-IPP algorithm. However, it is only partly operational at distances of 3 km or more. As the main algorithm for identifying bearings of similar objects in the "Story" group, it is advisable to use IPP. Although these algorithms achieve high identification efficiency under favorable conditions, with tougher conditions, they drop rather sharply. Therefore, to maintain a high level of probability of "pure" identification, it is advisable to use additional measures to combat false triads. For the removal of problems, it is necessary to develop and apply combinatorial algorithms for exhaustive search, which is the direction for the development of further research.

Keywords: unmanned aerial vehicle, group of objects, bearing identification, horizontal bearing, spatial bearing, identification criteria, false notch

The constructions of directional microphones of the "linear" type and the test procedure are described. On a controlled lane of the highway, full-scale studies of microphones produced by the authors were carried out. Thus, the relative error in the measurement of microphones No. 1 and 2 was found, which was 12.1 and 13%, respectively. The minimum error is detected with a microphone of the "linear" type No. 1, whose slots are located on the sides on four sides

Keywords: transport stream, transport noise, passive acoustic detector, directional microphone

This article analyzes the role of organizational culture as an important tool for increasing staff motivation. There are revealed peculiarities of interaction of enterprise culture and corporate system of motivation and the substantial party culture from a position of strategic resource of the enterprise in the management of the personnel motivation.

Keywords: organizational culture, motivation, staff, culture, motivation, motivational policy of the enterprise, corporate incentive system

The solution of the problem of justifying the operating modes and the acquisition of equipment used in the technological processes of timber industry is proposed to be implemented using the described methodology. The methodology is based on probabilistic-statistical analysis of technological processes and their representation as queuing systems.

Keywords: technological network, technological process, technological line, complex, queuing theory, queuing system, timber industry complex

Programmatically implemented in MATLAB algorithm for calculating the intensity of the transport stream for the acoustic emission of cars based on the fixation of the amplitude value of the acoustic signal. The software allows you to change the threshold for fixing the amplitude value. For the approbation of the proposed software, field studies were carried out on the street-road network in Penza. Practical implementation of the software may require the introduction of an adaptive threshold, depending on the number of lanes of the road.

Keywords: noise, vehicle intensity, traffic flow, MATLAB, signal amplitude, acoustics, passive acoustic detector

In the article the algorithm of construction of an array of points, put in correspondence to points of a compartment of a surface is resulted. Calculation formulas for the coordinates of points are shown. The possible cases of the location of the corner points of the array are considered. And the conclusion is made that this algorithm will help in modeling acoustic, optical and other processes.

Keywords: array of points, surface area, algorithm for matching array points, geometric modeling, radix-vector