bluuebunny/crossref_metadata_2025 huggingface dataset:
A tale of the city of Kolkata through the eyes of the “common women"
Authors: Santra Aparajita
Published: November 2023

This paper focuses on working-class women from the informal settlements of Kolkata, India and their precarious relationships with the city. Their existence at the margins of society (socially, spatially, historically, and sometimes even geographically) tends to make them invisible actors in the production of contemporary urban spaces of Kolkata. This paper examines the role of class, caste, and gender in informing the spatial practices of these minoritized women that occur in the city’s liminal landscapes. These practices are quite distinct from those of women from middle- and upper-classes in Kolkata. Terms like “public women” or “bad women” or chhotolok (a common Bengali term used for people from lower classes or castes) have been used to represent and mark these working-class, lower caste women as deviant bodies in terms of their class, caste, and even sexualities. These labels are important to understand how these women have been represented historically in the urban history of Kolkata. By analyzing secondary literature, archival texts, songs, films, poems, and photographs, the paper investigates the following interrelated questions. First, how has the spatial organization of urban Kolkata historically determined the ways in which these women have navigated, engaged with, and attempted to overcome a wide array of structural and systemic constraints? And second, how have these women produced and applied various forms of situated spatial knowledge in the city’s liminal landscapes?
In terms of the paper’s structure, I start by analyzing the existing literature on gender and urban space in India. Thereafter, I lay a theoretical groundwork to elucidate the importance of adopting an intersectional lens to understand overlapping regimes of power that affect the life-worlds of minoritized bodies; in this case, the working-class lower caste women of Kolkata. Finally, I use a chronological approach to examine the changes in Kolkata’s urban fabric and its material culture that have significantly added to the precarities faced by these minoritized and marginalized women. In other words, I trace an alternate urban history of Kolkata through the eyes of these “common women.”
Ensuring situational awareness of the moving objects group using one reference navigation station
Authors: Shuvaev I.V. , Kiryushkin V.V. , Babusenko S.I. , Zhuravlev A.V.
Published: November 2023

Problem statement. In the conditions of radio suppression of the global navigation satellite systems, situational awareness of a group of moving objects can be provided using local navigation. Known methods based on the use of local navigation to ensure situational awareness require the mutual exchange of information between the objects of the group, and used several reference stations to determine the coordinates. Purpose. To develop and research of a method of mutual awareness of each moving object about the spatio-temporal state of all moving objects of the group without organizing additional information exchange between the objects of the group, based on the use of one reference navigation station with known local coordinates. Results. A method for ensuring situational awareness of a group of moving objects is proposed. Method based on the use of one reference navigation station equipped with a radio direction finder. The method ensures positioning accuracy of the follower object on board the lead object up to 10 m when the follower object is within the interfocal space of the goniometric-difference-range-measuring system formed by the reference navigation station and the lead object. When the follower object leaves the interfocal space degradation of the accuracy characteristics up to 100 m is observed, which is associated with an increase in the values of the geometric factor. In this case, the accuracy of estimating the delay of interrogation and response signals should be no worse than 5×10-7 s, and the measurement error of the azimuth angle in the radio direction finder of the reference navigation station should not exceed 3-5°. Practical significance. The proposed method can be used in practice to ensure situational awareness of a group of subscribers of a local communication system for special purposes.
Evaluation of the noise immunity of the navigation equipment of consumers of the global navigation satellite system with spatial adaptation based on the algorithm of maintaining the level of the useful signal
Authors: Babusenko S.I. , Kiryushkin V.V. , Zhuravlev A.V. , Markin V.G.
Published: November 2023

Problem statement. The use of spatial filtering of signals in adaptive antenna arrays (AAR) of consumer navigation equipment (NAP) of the global navigation satellite system (GNSS) in conditions of intentional interference is an effective means of ensuring stability and continuity of positioning of mobile objects. The specifics of solving this problem is the low level of navigation signals received from the upper hemisphere of space against the background of powerful concentrated interference, significantly exceeding noise. Most compact L-band AARs consist of 4-8 elements, and the algorithms used optimize compensation indicators without the presence of a priori information about the position of useful and interfering signals. At the same time, the formed dips on the sources of interference in width can lead to a loss of the availability of spacecraft signals for subsequent processing. This circumstance determines the relevance and practical orientation of the task of evaluating the effectiveness of the diagram formation algorithm, taking into account the integration of interference attenuation indicators and maintaining the level of the useful signal. Purpose. Investigation of the characteristics of the spatial interference compensation algorithm with a linear restriction on the direction of reception of the useful signal, as well as an assessment of its impact on the performance of the equipment of consumers of the global navigation satellite system. Results. The level of compensation of spatially distributed interference sources is analyzed using a processing algorithm that minimizes the average power of the adaptive antenna array with the exception of the direction of reception of the useful signal to the zenith. The influence of the spatial compensator on the availability of spacecraft signals for subsequent processing, depending on the number, level and angular coordinates of interference sources, is investigated. Practical significance. A model is proposed for evaluating an algorithm that maintains constant gain at the zenith and minima in the interference directions for a four-element L-band antenna array. The given values of interference attenuation depending on the number, level, angle of location and azimuth of the impact make it possible to clarify the indicators of noise immunity of the equipment of consumers of a global navigation satellite system equipped with a spatial compensator.
Selection of the bandwidth of the «raised cosine» shaping filter for navigation meander signals
Authors: Nerovny V.V. , Zhuravlev A.V. , Kiryushkin V.V. , Filonenko V.V. , Radko V.S.
Published: November 2023

Problem statement. One of the ways to reduce the level of out-of-band radiation when generating navigation signals is to use a "raised cosine" type filter. However, the issues of the formation of meander navigation signals using the "raised cosine" filter have not been fully investigated. In particular, the question of choosing the frequency band of the "raised cosine" type filter remains open. Purpose. Evaluation of the influence of the bandwidth of the "raised cosine" forming filter on the spectral and temporal characteristics, the energy efficiency of the transmitter, as well as the integrity of the structural and temporal parameters of navigation meander signals. Results. Analytical expressions for the pulse characteristic of the "raised cosine" type filter are obtained, taking into account the parameters of meander signals. The influence of the frequency band of the "raised cosine" filter on the distortion of meander signals in the frequency and time domain is estimated by mathematical modeling. It is shown that for the formation of meander signals in the "raised cosine" filters, it is advisable to choose the maximum frequency band, which ensures minimal distortion in the frequency and time domains, the minimum value of the peak factor and the best characteristics of the integrity of the structural and temporal parameters of the signals. Practical significance. The results can be used by specialists in the field of satellite radio navigation in the modernization of global navigation satellite systems.
Asynchronous STW resonators with the high quality factor and reduced sizes
Authors: Doberstein S.A. , Veremeev I.V. , Razgonyaev V.K.
Published: November 2023

Surface transverse waves (STW) on quartz have the high propagation velocity, which is higher by 60% than velocity of the Rayleigh surface acoustic waves (SAW), high temperature stability comparable with temperature stability of SAW on quartz. Those advantages allow successfully use STW in the high frequency resonators. However, a large number of the electrodes 400 in the reflectors is required to ensure the high quality factor of the resonators. This leads to increase the resonators sizes, especially on the frequencies < 1000 MHz. The 500-1000 MHz STW resonators with high quality factor on 36°YX90° cut quartz and reduced size were presented. Use of the asynchronous topology, constructional, topological and technological optimization with a computer simulation on the base of a equivalent circuit model allowed obtain in the frequency range of 500-1000 MHz the high quality factor of 8600-9500, reduced sizes of the topology in comparison with the known prototypes and place the resonators in the 3×3×1.2 mm and 5×5×1.8 mm SMD packages. The developed STW resonators with high quality factor and reduced sizes will be widely used in the miniature low noise oscillators.
Hybrid synthesizer with two PLLs and DDS Part 2. Fine tuning circuit and main PLL
Authors: Korolev A.V. , Korshikov Y.V. , Rykov S.G.
Published: November 2023

The use of a direct digital synthesizer (DDS) with a frequency converter in the frequency shift circuit of a hybrid synthesizer of high-frequency oscillations can significantly reduce its phase noise. This version of the frequency synthesizer (FS) has not been previously considered in known publications. There is a need to perform an analysis of existing circuits of hybrid FS with PLL to identify the elements that make the greatest contribution to the phase noise of the output oscillations, develop and experimentally test a FS with a low level of phase noise power spectral density. The performed calculations and experiments show that the use of a frequency shift circuit with frequency conversion based on a DDS operating in the first Nyquist zone in a hybrid frequency synthesizer makes it possible to minimize the effect of DDS phase noises on the FS phase noises. In this case, at frequencies of detuning from the carrier, where the flicker noise of the PFD of PLL circuits in cascade connection prevails, the contribution of the flicker noise of the PLL chips to the noise of the output oscillation of the FS will be equivalent. It is convenient to estimate the phase noise of the FS at the equivalent frequency, determined by the frequency of the phase detector and the division factor in the feedback circuit of the second (main) PLL ring. Taking into account the results of the first part of this work, the calculated relations obtained allow us to design hybrid frequency synthesizers with DDS and PLL with a low level of phase noise. The expressions obtained in the work for the phase noise of a hybrid FS and its components also make it possible to estimate the potentially achievable levels of FS phase noise and can be used in calculating the characteristics of oscillation sources and signal synthesizers.
Investigation of active laser delivery and antimycotic activity of zinc-containing nanomaterials and photodynamic drugs in the treatment of onychomicosis
Authors: Belikov A.V. , Kozlova A.D. , Fedorova Yu.V. , Smirnov S.N.
Published: November 2023

One of the most common nail pathologies is onychomycosis, a fungal nail infection. The low efficiency of existing methods for the treatment of onychomycosis stimulates the search for new drugs and technologies for their delivery under the nail plate. The aim of the investigation was to study the possibility of using Er:YLF laser radiation for sequential laser microporation of the human nail plate and active laser delivery of modern photodynamic preparations and zinc-containing nanomaterials under the nail plate, as well as to determine their antimycotic activity against the Candida albicans fungus under photodynamic exposure with a wavelength of 656±10 nm. A 0.001 % aqueous solution of methylene blue, a chlorine-containing Revixan gel, as well as zinc-containing nanomaterials, which are aqueous solutions of polyvinylpyrrolidone gel with different concentrations of Zn(NO3)2 nanoparticles and acidity, were studied. It was established that the smallest number of laser pulses required for in vitro microporation of the nail plate and active laser delivery under the nail plate is required when using a 0.001 % aqueous solution of methylene blue, and the largest is required when using Revixan gel. For zinc-containing nanomaterials, an increase in the concentration of Zn(NO3)2 nanoparticles from 14 to 40 % leads to an increase in the number of laser pulses required for active drug delivery under the nail plate by 1.25 times, while a change in the acidity of the pH gel from 7.0 to 6.7 does not has a significant impact on it. It was found that all the studied drugs in combination with photodynamic action at a wavelength of 656±10 nm have an antimycotic effect on the Candida albicans fungus culture. The minimum growth rate of Candida albicans colonies was observed when using the Revixan gel, for which the antimycotic activity reached 73.8 %. The obtained results can be applied in the development of laser systems and technologies for the treatment of fungal diseases, including for photodynamic therapy of onychomycosis.
Formation of a threened phased antenna array using the point source method
Authors: Pasternak Yu.G. , Pendyurin V.A. , Proskurin D.K. , Fedorov S.M.
Published: November 2023

Formulation of the problem. Many electronic applications (for example, satellite communications) impose significant restrictions on the weight and dimensions of the antenna devices used. In addition, the antennas used should have the lowest possible cost and simplicity of design. To solve these problems, it is proposed to use a method for reducing the number of antenna elements in phased antenna arrays based on the method of point sources. Purpose. The purpose of this work is to develop a method for reducing the number of antenna elements in phased antenna arrays while maintaining the parameters of their radiation patterns. Results. As a solution, it is proposed to place the antenna elements above the metal sheet at a distance 1.5–2 times smaller than the size of the antenna array itself, which will significantly reduce the number of elements of the latter without deteriorating its radiation pattern during wide-angle two-coordinate scanning of space with the main lobe. Practical significance. Obtained results can be used to create phased antenna arrays with a reduced number of elements, which will reduce the size, weight and cost of the device.
Protection of radio-electronic products from high-voltage pulses using a hot-swap controller
Authors: Bobylkin I.S. , Yampolsky D.A. , Kuzyomkin A.A. , Turkeev A.D.
Published: November 2023

Formulation of the problem. The use of a protection unit in a radio-electronic device against short-term or long-term surges of high currents and voltages based on the controller makes it possible to eliminate the failure of power circuits, analog or digital component base and avoid local overheating. This circuit design significantly increases the reliability of the finished product. Target. Ensuring the protection of electronic devices from overvoltage or overcurrent. Development of a protection unit, calculation of nominal values of circuit elements. Results. Classical solutions of protection of power supply buses from overloads by electrical parameters are considered. The nominal values of the protective circuit elements were calculated using the RT1720 hot-swap controller. A submodule based on the RT1720 controller is designed. Practical significance. The circuit of the protective circuit based on the hot-swap controller can be used in secondary power supplies, as well as in various electronic products where a high level of reliability and a long service life are required.
Address direction finding of ZigBee devices
Authors: Faustov I.S. , Tokarev A.B.
Published: November 2023

Statement of problem. The active use of wireless technologies requires the development of means of monitoring devices and data transmission networks and, in particular, ZigBee wireless personal networks. Therefore, the detection and localization of working ZigBee devices is an urgent task of radio monitoring services. Correlation-interferometric direction finders based on two-channel radio receiving equipment cyclically connected to various pairs of elements of a multi-element antenna system can serve as a tool for bearing radio signals. For the direction finding of packet radio signals, the direction finder accumulates time samples from different antenna pairs over long time intervals; joint processing of these data allows determining the direction of arrival of radio signals. An obstacle to the direction finding of ZigBee devices is the fact that many similar devices can simultaneously operate in the same frequency range, generating a chaotic alternation of packets in the air. As a consequence, the accumulation of information from a specific ZigBee device for different antenna pairs of the direction finder becomes problematically. Purpose of the work is to develop a method for joint identification and bearing of detected devices of ZigBee networks. Results. the presented method of address bearing is implemented on the basis of the mobile direction finder ARTICLE-M, used to search for and locate unauthorized sources of radio emissions, and allows detecting signals of the 802.15.4 standard, identifying personal network devices, as well as forming estimates of directions to these sources of radio emissions. Practical importance. the use of address bearing of ZigBee network devices increases the functionality of existing radio monitoring equipment, and also allows the localization of unauthorized radio sources masquerading as Internet of Things devices.
An effective method for modelling wireless communication systems
Authors: Chirkov O.N. , Romaschenko M.A. , Bobylkin I.S.
Published: November 2023

Statement of the problem. To describe the multipath propagation of radio signals using two models: the ray tracing method and the method of stochastic simulation. Let us consider the stochastic model as the most general one that allows to describe various scenarios and factors influencing signal propagation such as multipath, arrival time variance, distance loss, atmospheric conditions, etc. Under real-world conditions, channel variation does not follow a Gaussian distribution. Coloured non-Gaussian noise has to be taken into account in the design and modelling of the wireless communication system. The complexity of the stochastic channel modelling method is that the variation of PSD power spectral density function and PDF probability density function of a random variable are strongly related to each other. To remove the limitations of existing methods, the Gaussian random variable filtering method is used. But in contrast to the applied simulation techniques, we will use Global Search Optimization (GSE) algorithm. Objective. To investigate a possibility of generation of colored non-Gaussian noise which satisfies the specified requirements by the filtering method based on the global search optimization algorithm. Results. The method based on the global search optimization algorithm for generating colored non-Gaussian noise, which satisfies specified requirements of the Spectral Power Density function and the Probability Density function, is proposed. Numerical simulation results confirm its effectiveness. The advantage of the new method is that the complexity of calculating the required pre-distortion for the filter is replaced by a simple search method. Once the required coefficients are found, non-Gaussian noise generation can be accomplished by secondary filtering and inverse transform. Practical Significance. Compared to methods based on block structures or other analytical methods, the proposed method is more suitable for real-time wireless channel simulation.
Direction finding of electromagnetic radiation sources using the volumetric phased arrays consisting of the small number of elements
Authors: Gorbunov Y.N. , Epifanov M.A.
Published: November 2023

Problem statement. This article proposes a method to measure the bearing of electromagnetic radiation sources in the conditions of passive interference with multipath propagation and in the conditions of using "rough" (small number of elements) statistics taking into account particular design features of the direction finder located on a mobile object. The technical design of an adaptive direction finder (ADF) with a small number of channels M = 7 and “short spatial samples” m = 2 (bases) is substantiated, which leads to reducing hardware and software costs. Target. Determine the method of direction finding of electromagnetic radiation sources by volumetric phased arrays consisting of the small number of elements, which allow for the presence of passive interference with multipath radiation of electromagnetic radiation sources, and include spatial digital filters (DF) of a low order r = 2. Results. The problem of measuring the bearing of electromagnetic radiation sources under the conditions of correlated multipath passive interference and limited hardware and computing resources was solved. Direction finder includes a 7-element monopulse direction finder, which was built according to a sequential scheme at the nodes of a volumetric hexagonal grid with an equivalent spatial quantization step of 0.5l, forming programmable small-sized bases with a size of no more than l using the method of multiplexing (HF switching). Practical significance. The relevance of the proposed approach is substantiated due to the need to notch "multipath components", parasitic reflections from local objects surrounding the adaptive direction finder, and reduce the instrumental error in bearing measurement. A new approach to the construction of a volumetric phased array of an adaptive direction finder is proposed. Novelty. The synthesis of the optimal estimate is based on the principle of “whitewashing” passive correlated interference and the maximum likelihood method, which guarantees the achievement of potential direction finding accuracy in the conditions of using rough statistics that reduce hardware and software costs.
Search algorithm for the reflected signal of a satellite radio altimeter
Authors: Zhesterev А.E. , Ipatov V.P.
Published: November 2023

Satellite altimeters are installed on spacecraft designed to solve problems of Earth exploration, and in addition to altitude, they are able to measure the degree of sea surface roughness and some other parameters. A rough determination of the delay time of the probing signal of the altimeter is the signal search procedure, the quality of which in real conditions can be degraded by the presence of an unknown rate of change in the height of the spacecraft. The need for a search procedure arises every time the altimeter loses the reflected signal, for example, after the satellite crosses the border of the land with the water surface. The presence of the rate of change in the height of the apparatus during the search leads to a slip of the signal relative to the time scale of the altimeter, reducing the efficiency of the search. The decrease in the influence of this factor is facilitated by a reduction in the duration of coherent signal accumulation. The aim of the work is to develop an algorithm for searching for the echo signal of a space-based altimeter, less sensitive to possible changes in the height of the spacecraft while reducing the duration of the search. The paper analyzes and compares the characteristics of two echo signal search algorithms. The first algorithm is the usual one-step procedure that checks the time uncertainty zone step by step using a bank of correlators of a given size. As an alternative, a two-stage search is proposed, the first stage of which selects the points of the uncertainty zone in which the presence of a signal is suspected. At the second stage, the results of the first are retested in order to identify a single point that should be recognized as containing a signal, while the coherent accumulation time is determined by the longest stage. It is shown that the two-stage algorithm is less sensitive to changes in the altitude of the spacecraft, provides a reduction in the duration of the search with the same probability of its correct outcome, and can be recommended for use in a space radio altimeter.
Application of the reversible step-up and step-down pulse converter as a charging and discharging device in an autonomous system of electric power supply
Authors: Krasnobaev Y.V. , Nepomnyashchiy O.V. , Sazonov I.E. , Yablonskiy A.P. , Khaidukova V.N.
Published: November 2023

Formulation of the problem. The structure shown in Figure 1 is widely used to build spacecraft power supply systems. It contains a solar battery in series and voltage regulator, which a load is connected to its output. To supply power to the load when the solar panel has no or insufficient capacity, the power supply system uses a battery pack which is charged and discharged by means of a charge-discharge device connected between the output of the voltage regulator and the battery pack. The power supply can be used to build power supply systems for a wide range of autonomous objects, such as unmanned aerial vehicles with long flight times, unattended weather stations, and environmental monitoring stations. In a power supply system with the structure shown in Figure 1, each of the devices can stabilize the output voltage: a voltage regulator, a discharge device and a battery charger. In such a power supply system, the operation of the charger and the discharger are separated in time, allowing them to function together. The use as a charge-discharge boost-decrease reversible pulse voltage converter with a high efficiency allows minimizing the number of elements in the power circuit of the device due to the possibility of reversing the energy flow reversal, which will improve the weight and size characteristics of the system and increase to increase its reliability. The purpose is to show the feasibility of using a converter with a high efficiency factor and the possibility of reversing the energy flow as a charge-discharge device as part of the power supply system of an autonomous object. To develop a model and confirm the possibility of operating the pulse converter as a charger in two modes: in the mode of providing a given charging current of the battery and in the mode of charging the battery with a decreasing current at a given voltage on the battery. Results. The expediency of using a reversible pulse converter with a high efficiency factor and the possibility of reversing the energy flow as a charger in the power supply system of an autonomous object is shown. A model has been developed and confirmed of the converter as a charger in two modes: in the mode of providing a given charging current of the battery and in the mode of charging the battery with a decreasing current at a given voltage on the battery pack. Practical Significance. The use of a reversible pulse converter as a single charge-discharge converter in the power supply system of an autonomous object will improve the mass-size characteristics, efficiency and reliability of the power supply system and increase life time of active operation of autonomous object as a whole Keywords: power supply system, autonomous object, solar battery, accumulator battery, pulse converter, charge-discharge device.
Influence of the range Doppler coupling error on the characteristics of second-order filters
Authors: Murzova M.A. , Farber V.E.
Published: November 2023

This paper mainly considers a growing-memory filter for tracking an object moving with constant acceleration and detected by chirp radar. Chirp radars employ linear frequency modulated (LFM) waveforms for object tracking which yields a displacement of measured position from a true range of moving objects. This effect may enable better track accuracy in range. The second order degree polynomial describes coordinates law for a constantly accelerating maneuvering object. The issues of lag errors, covariance matrix of the filtered state vectors, impulse responses and Kalman gains are discussed. For example, the growing-memory filter is most often used for initiating track. The growing-memory filter is derived in recursive and non-recursive form based on least-squares. It is shown that the growing-memory filter estimating a true object range (with the range-Doppler coupling coefficient) can be represented by the growing-memory filter estimating a biased object range (without the range-Doppler coupling coefficient) and compensating the estimated biased range by the estimated the range-Doppler coupling error. Expressions giving an interrelation between lag errors, covariance matrix of the filtered state vectors, impulse responses and Kalman gains of growing-memory filters estimating true and biased range of moving objects are derived.
Ways to improve the efficiency of cooled radiators of electronic equipment manufactured using deep drilling technology
Authors: Goryunov R.V. , Dynyaeva N.S. , Kravtsov S.B. , Vdovichenko T.V.
Published: November 2023

This article discusses the option of increasing the thermal efficiency of cooling radiators for electronic equipment manufactured using deep drilling technology. It is proposed to use electrical discharge machining technology to increase the efficiency of deep drilling channels. In a plate made of aluminum alloy, round holes are drilled along the entire length of the workpiece. Then wire for electrical erosion processing is fed into the round hole, which makes it possible to obtain a cross-section with a larger heat transfer area. The article discusses five options for sections of increased area. The heat removal efficiency for each of the cooling channel cross-section options was considered by modeling in the Solid Works Flow Simulation software environment. Distilled water was used as a coolant. The volumetric coolant flow rate is 0.8 liters per minute. The coolant temperature and the ambient temperature are equal to 25 degrees Celsius. The study considers a 30-watt thermal equivalent. The simulation results show that an increase in the heat exchange area in cooled radiators makes it possible to reduce the thermal equivalent temperature in a steady state, which indicates an increase in the thermal efficiency of the radiator. To confirm the modeling results, test the manufacturing technology and use of radiators with deep drilling, a thermal mock-up was made. Tests of the thermal model were carried out under conditions that best corresponded to the modeling conditions. A comparison of the results of modeling and experiment shows that the values obtained as a result of the experiment exceed the values obtained from modeling in all cases. The excess value ranges from 4.7 degrees to 7.4 degrees and is associated with the presence of an air gap between the copper plate and the radiator plate, the actual value of which exceeds the value of the calculation model. Analysis of the research results shows that the considered method of refining cooling channels obtained by deep drilling does not allow obtaining a qualitative increase in efficiency; the difference between the best and worst results does not exceed 3°C. The benefits obtained by this modification amount to a few degrees, which indicates the limited use of this method.
Modified depth map post-processing method for problems of accident-free UAV driving in urban infrastructure
Authors: Fedosov V.P. , Ibadov R.R. , Ibadov S.R.
Published: November 2023

Formulation of the problem. Currently, unmanned aerial vehicles (UAVs) are actively used to solve cross-industry tasks, such as photo and video filming of the surrounding space, remote analysis of surrounding objects, cargo delivery, monitoring the state of transport routes and mining complexes. UAVs are also used in emergency areas where the presence of people is associated with a threat to life. Since good orientation in space is necessary in all of these areas, UAV orientation in urban infrastructure is of great practical importance. For example, for accident-free driving of UAVs, determining the distance to obstacles (image depth maps) and constructing the trajectory of their flight is of great importance, which is relevant for precise UAV orientation in urban infrastructure. Target. Propose a modified method for post-processing the image depth map for the problems of accident-free driving of UAVs in urban infrastructure. Results. Existing methods and algorithms for converting from 2D signals to 3D signals in image analysis and display systems are considered. A study of the method of post-processing of the image depth map was carried out and its modification was proposed. To evaluate the effectiveness of the developed post-processing method, a comparative analysis of depth maps for various test images obtained by the original method and its modification was performed. Root-mean-square errors are obtained for the proposed and original post-processing methods for the considered test images. Practical significance. The presented modified image depth map post-processing method makes it possible to build sharper image depth maps, which provides more accurate UAV orientation in urban infrastructure.
The evaluation of the influence of Gaussian noise, harmonic type noise and combined noise to short range wireless devices
Authors: Artyushenko V.M. , Volovach V.I.
Published: November 2023

Modern short-range wireless devices are widely used for data transmission and / or control actions in various radio engineering and information-measuring networks. Such a device in the process of use is in the conditions of a potential violation of the permissible type, which limits the possibilities of their application. The aim of the work is to evaluate the Gaussian noise, harmonic type noise and combined noise on short-range wireless devices using pseudo-random frequency conversion and frequency ripple. An estimate of the influence of various types of noise on the named wireless devices is obtained, as well as the dependence of the average error probability on the signal-to-noise and signal-to-interference ratios. It is shown that devices in which the frequency span between channels is continuously changing have the highest noise immunity, and this is also typical for devices with the highest signal-to-noise ratio. The increase in the noise immunity of devices increases with the size of the signal alphabet. It is shown that the noise immunity of the device when exposed to combined noise, which is a superposition of noise and a harmonic signal, differs little when exposed to one of the named noises. It is noted that the use of binary block codes increases the noise immunity of the device. In the course of the work, practically significant results were obtained, which make it possible to evaluate the noise immunity of these devices for various values of the signal-to-noise and signal-to- interference ratios, as well as the size of the signal alphabet. The results obtained can be used in the construction and analysis of wireless devices operating in the unlicensed bands below 1 GHz.
Designing of a multi-frequency vibrator antenna on meander line with resonant loads and fragmented “floating ground”
Authors: Boyko S.N. , Egiazaryan A.M. , Koryshev O.V. , Trukhachev I.M.
Published: November 2023

Problem definition. Many VHF communication devices include multi-frequency vibrator antennas, among which a special place is occupied by the vibrator antennas with reactive loads as the most compact and simplest to produce. However, inductive loads usually used in practice don’t provide current cut-off at higher operating frequencies, which results in deformations of radiation patterns, and resonant circuits loads don’t provide sufficient shortening of the vibrator antenna due to appearance of shunt inductances. There is a need to formulate the new idea of the designing the multi-frequency vibrator antenna, which has absolutely another mechanism of work, is needed. Purpose. The purposes of this article are: to suggest the idea of the design the multi-frequency vibrator antennas, based on hybrid of meander line with parallel LC-circuits and fragmented “floating ground”; to form an equivalent scheme for calculating characteristics; to develop a methodology for calculating this type of antennas characteristics (input impedance, VSWR, current distributions over the vibrator and far-field radiation patterns); to do the calculation of characteristics of the monopole antenna on meander line with loads and to make an experimental check of the theoretical results. Results. A design of the multi-frequency vibrator antenna on meander line with parallel LC-circuits loads and fragmented “floating ground” is shown. An equivalent scheme for calculating antenna characteristics is given, an algorithm of calculation of input characteristics and current distributions over the antenna (both meander and “floating ground”) is described. The calculation of input impedance, VSWR, current distributions and radiation patterns of the vibrator antenna with two LC-circuits loads in meander line is done. An experimental check of the theoretical results in VSWR and far-field radiation patterns is made. Applicability of the proposed idea and methodology for the design the multi-frequency vibrator antennas on meander line is shown by analyzing calculated and experimental data. Practical significance. The results of this work can be used to design the multi-frequency VHF vibrator antennas with resonant loads, which have the identical radiation patterns at all operating frequencies.
Editorial
Authors: Aleixo Lúcia Helena Gaeta
Published: November 2023

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A LÍNGUA DO P E A IDENTIDADE FEMININA: UMA ANÁLISE DO CONTO DE CLARICE LISPECTOR
Authors: Catunda Márcia Antônia Dias
Published: November 2023

Este ensaio faz uma análise crítica do conto “A Língua do P” de autoria de Clarice Lispector (1998). O conto narra a história de uma mulher chamada Maria Aparecida que é professora e, por se ver, em uma situação de perigo, decide mudar a própria imagem. No ensaio serão abordados diversos aspectos do conto, assim como a análise de outros pesquisadores sobre o assunto.
O MODO DE PRODUÇÃO CAPITALISTA DO AGRONEGÓCIO E O RISCO À SAÚDE DO TRABALHADOR: UMA REVISÃO DA LITERATURA
Authors: Soares Mariana , Fava Nara Regina , Sato Camila Massae
Published: November 2023

O agronegócio é junção de negócios baseado em atividades econômicas que envolvem principalmente a agricultura e pecuária, baseadas na transformação da natureza que desencadeia em riscos ocupacionais, sanitários, ambientais e sociais inerentes em cada etapa da sua execução. Objetiva-se realizar uma revisão sistemática de estudos referentes à exploração capitalista do agronegócio e os riscos para a saúde do trabalhador. Foi realizada uma revisão sistemática de caráter analítico a respeito dos estudos que se referem à exploração do capital referente ao agronegócio no Brasil e os riscos para a saúde do trabalhador, através de artigos completos, idioma em Português, produzidos no Brasil, entre os anos de 2015 e 2018. Após a análise crítica do conteúdo, foram selecionados 20 artigos que abordavam os assuntos relacionados ao tema de pesquisa. Os artigos demonstraram que o agronegócio impulsionado pelo capitalismo, gera agravos e riscos a saúde dos trabalhadores, conflitos políticos entre o Estado e os latifundiários e uma falta de vigilância da saúde do trabalhador. Recomenda-se uma articulação entre os gestores responsáveis pelas Vigilâncias em Saúde, Sindicatos dos Trabalhadores, e as Unidades de Saúde, a fim da execução das ações de promoção e prevenção de acidentes de trabalho, sejam no setor primário, secundário ou terciário do agronegócio.
UBERIZAÇÃO: O GLAMOUR FALACIOSO DO EMPREENDEDORISMO
Authors: Guimarães Júnior César Gomes , Silva Ruteléia Cândida de Souza
Published: November 2023

O presente artigo tem por intuito apresentar uma análise acerca dos aplicativos de uberização do trabalho, que inicialmente é apresentado para sociedade como uma possibilidade de complementação de renda, mas é possível afirmar que é uma forma de flexibilizar as leis trabalhistas de uma nação, fazendo com que o trabalhador arque com todos os imprevistos que possa acontecer como roubo do meio de locomoção, acidente durante o percurso, portanto, outro aspecto desse aplicativo, é utilizar os bens próprios do trabalhador como bicicleta, carro e moto, o risco que seria para quem vai ser apropriar do valor, mas é transferido para o trabalhador.
INCIDÊNCIA DE TRAUMA FACIAL EM MULHERES VÍTIMAS DE VIOLÊNCIA DOMÉSTICA DURANTE O ISOLAMENTO SOCIAL DA PANDEMIA DA COVID-19
Authors: Trzinski Elisa Neves , Oliveira Amanda Gahyva Marques de , Pinheiro Mariana Farias , Silva Carolina Silvano Vilarinho da
Published: November 2023

Em 2019, um vírus denominado SARS-CoV-2 (coronavírus) se disseminou pelo mundo, tal vírus é caracterizado por uma infecção respiratória de rápido contágio, que se apresenta através de sintomas semelhantes ao de uma gripe comum nos indivíduos, muitas vezes assintomáticos, favorecendo assim sua rápida propagação. Em tentativa imediata de sessar o contágio, a OMS (organização mundial de saúde) impôs o isolamento social como medida de segurança, obrigando as famílias a permanecerem confinadas em domicílio por tempo indeterminado. Como uma das muitas consequências desta pandemia, foi constatado um aumento significativo na quantidade de casos de violência doméstica feminina, já que as vítimas ficaram exiladas com seus agressores em período integral. Naquele momento, as vítimas de violência doméstica perderam a conexão com outras pessoas, desta maneira as colocando em regime de silêncio e invisibilidade, o que dificultou a quebra do ciclo da violência. Diante disso, se fez ainda mais notória a importância dos profissionais da saúde que estavam na linha de frente no momento pandêmico, na abordagem e amparo dessas vítimas. Tendo em vista que os traumas mais comuns neste tipo de violência são em região de cabeça e pescoço, o cirurgião-dentista se tornou o maior responsável nesta identificação. Portanto, se faz evidente a importância do conhecimento por parte do odontólogo das regiões mais acometidas pelos agressores, para uma correta identificação, abordagem, intervenção multidisciplinar e amparo psicossocial às mulheres vítimas de abuso doméstico.
UTILIZAÇÃO DA LÃ DE PET COMO SOLUÇÃO NO ISOLAMENTO ACÚSTICO E NA SUSTENTABILIDADE
Authors: Mendes Eric Guilherme , Ferreira Walkiria Pederiva
Published: November 2023

A construção civil tem passado por diversas mudanças com o passar do tempo, e isso fez surgir à necessidade de se pensar na sustentabilidade no setor da construção. O aumento populacional tem causado níveis bastante elevados de ruídos, devido à presença de máquinas, o trânsito excessivo, construções de obras de pequeno e de grande porte, entre outros. Com isso a acústica passou a ser inserida no cotidiano da sociedade com maior frequência. A acústica é o meio utilizado para trazer maior conforto e qualidade sonora às edificações. Visando questões sustentáveis, buscou-se utilizar o plástico, um dos materiais que mais polui a natureza, no isolamento acústico de ambientes sem perder a qualidade e desempenho nos projetos acústicos. A lã de PET é um material relativamente novo no mercado, no entanto possui grande eficiência quando comparado com outros materiais que desempenham a mesma função. O trabalho em questão se se configura em sete tópicos: o primeiro tópico introduz o assunto em questão trazendo os objetivos da elaboração deste artigo; o segundo tópico esclarece do que se trata a acústica arquitetônica; o terceiro tópico se aprofunda em conceitos acústicos importantes para melhor compreensão do tema; o quarto tópico relata sobre o tratamento acústico com foco no isolamento; o quinto tópico trata sobre questões de sustentabilidade e informações relevantes ao artigo; o sexto e penúltimo tópico apresenta e traz pesquisas a respeito da lã de PET; e o sétimo e último tópico traz conclusões tiradas a partir de estudos e pesquisas.
Technological innovations and their impact on higher economic skills and studies: realities and perspectives
Authors: Pisaniuc Maia
Published: November 2023

Lately, innovation has become an inevitable notion in all fields of activity, innovation based on technology, on products, on processes, innovation in the behavioural approach. The beneficial effects of innovation are undeniable, but few studies have investigated this phenomenon, particularly in terms of the skills it requires, the labour market, how it will affect economic specialities and the number of specialists in this field. 
The aim of this article is to study the effect of innovation on the training of economic specialists and the skills required. How the structure of specialisations will change, the number of specialists needed on the labour market will change, as a result of digitisation and IT-based business models.
Research methods: comparative analysis of the skills required by employers compared to those currently provided, deduction of future needs in relation to future professions, modelling of the scenario of existence of future universities.
As a result of the research we propose to identify the future specialties with an economic profile as a result of the application of information technologies with an economic profile, the required competences, the most effective study/learning methods, the determination of the university/economic studies in the futu
re.
Effect of AOT/Heptane Reverse Micelles on Oxidation of Ferroin by Metaperiodate: Kinetic and Mechanistic Aspects
Authors: BODASİNGİ Leela Kumari , PULİPAKA Shyamala , KİLANA Venkata Nagalakshmi
Published: November 2023

A kinetic study of the oxidation of Ferroin, [Fe(phen)3]2+ by metaperiodate (IO4-) has been carried out in AOT/heptane reverse micelles by changing W = ([H2O]/[AOT]) and AOT concentration. The reaction order is first order with respect to Ferroin, while zero order with respect to IO4-. The reaction rate is faster in aqueous medium compared to AOT reverse micelles by eight times. The oxidation rate increases with an increase in the value of W (at fixed surfactant concentration, [AOT]) and decreases with AOT concentration. The effect of W on rate is elucidated based on the low dielectric constant of the water pool. Berezin's pseudo-phase model has been applied to explain the effect of AOT on rate.