bluuebunny/crossref_metadata_2025 huggingface dataset:
Концепция технологического суверенитета в меняющемся мире
Authors: Данилин И.В. , Сидорова Е.А.
Published: October 2024

В статье рассмотрена эволюция концепции технологического суверенитета в условиях экономической глобализации, роста сложности сектора высоких технологий, новых геополитических реалий, последствий пандемии COVID‑19 и развития цифровых технологий. Рассмотрены ключевые подходы к формированию технологического суверенитета, в том числе защитная функция (ограничения конкурентов) и индустриальная модель, опирающаяся на формирование независимого технологического потенциала страны на уровне важнейших компетенций НИОКР и производств. Показана ограниченность в современных условиях защитного и индустриального подходов, что связано в том числе с высокой сте‑ пенью международной взаимозависимости технологических процессов и ресурсными ограничениями. Описано формирование новой «открытой» модели обеспечения технологического суверенитета, осно‑ ванного на формировании системы партнерств и конкурентном сотрудничестве стран (при учете геополитических и иных требований к кооперации). Сделан вывод о необходимости приспособления технологического суверенитета крупнейших игроков к новым условиям и решениям актуальных вызовов развития современной открытой модели, в том числе ее соотношению с традиционным политическим суверенитетом, определением критериев технологической независимости и целеполаганием технологического суверенитета (безопасность, мировое лидерство, экология и пр.).

The article examines the evolution of the technological sovereignty concept in the context of economic globalization, growing complexity of the high‑tech sector, new geopolitical realities, COVID‑19 pandemic, and the development of digital technologies. At present, key approaches to the technological sovereignty are protective function (restrictions against competitors) and the industrial model which stresses national technological independence (most important R&D competencies, production). The article argues that rising global technological interdependence and resource constraints limit efficiency of both protective and industrial approaches. The article highlights formation of a new «open» technological sovereignty model, based on a system of international partnerships and coopetition (with geopolitical and other requirements included). Authors argue, that adaptation of the technological sovereignty concepts to the new realities is needed, as well as responding to the challenges of the “open” model, including its relationship with traditional political sovereignty, defining the criteria of technological independence, and goalsetting (security, global leadership, climate change, etc.).
Problematic issues of application of methods of accelerated radiation testing of ECB
Authors: Avdyushkin Sergey A. , Maximov Igor A. , Kochura Sergey G.
Published: October 2024

In this paper, an analysis of existing domestic and foreign regulatory documents regulating the conduct of radiation tests of EEE-part to determine resistance to dose effects is carried out. Ionizing radiation from outer space is one of the most important operational factors affecting the performance of on-board equipment, as a result, determining the duration of the active existence. This largely determines the relevance of the topic of radiation effects in electronic equipment materials, radiation-induced degradation of semiconductor devices and integrated circuits, and determining the reliability and radiation resistance of on-board equipment under the influence of the ionizing radiation from outer space. Conducting radiation tests of EEE-part (total dose effects) is an integral part of the process of ensuring radiation resistance of on-board electronic equipment and the spacecraft as a whole. The paper identifies and shows the existing risks of the developer of the on-board equipment and the spacecraft as a whole while ensuring the radiation resistance of the equipment and the guaranteed fulfillment of the target task of the spacecraft during the entire period of active lifetime.
Numerical simulation of supersonic gas flow in a conical nozzlewith local plasma heating and experimental results
Authors: Voronin Sergey T.
Published: October 2024

The results of the main theoretical calculations and some experiments on local heating of the supersonic flow of gases by an external inductor with low-temperature plasma during the ionization of gases in a ceramic, conical nozzle, carried out by means of a powerful, high-frequency, electromagnetic field, are given. Numerical calculations are based on the provisions of electromagnetic field theory based on the equations of Maxwell, Navier Stokes for gas dynamics, Saha Eggert for ions and electrons, which make it possible to calculate the basic parameters of the inductor and the necessary specific power for heating supersonic, multicomponent, gas flows with low-temperature plasma. A model of vortexless (laminar), supersonic, stationary gas flow was used and mathematical modeling of its movement in a conical nozzle was carried out with the aim of possibly using the effect of additional heating of the gas flow with low-temperature plasma to increase the efficiency of the liquid rocket engine.
It was found that in order to effectively heat the gas flow with low-temperature plasma in the design diameter, a conductivity of gases of at least s 200 1/·m is required for the initial temperature Ta = 2528 2674 оK and the frequency f = 27,12 MHz, which is not feasible even in the presence of a high concentration of impurities based on alkali metals. Therefore, a special device was developed an ionizer for the combustion chamber. The use of an ionizer allows to achieve the specified conductivity for the pressure in the combustion chamber of 15 MPa (a link to the article is given in the list of references).
Calculations indicate the possibility of effective heating with low-temperature plasma of the supersonic flow of gases in the initial volume of the conical nozzle, which is adjacent to the critical cross-section of the liquid rocket engine. This will allow in the future to significantly increase its specific impulse and thrust at the start, due to an increase in the flow rate of gases in the design section. It has also been determined that the parietal region of a conical nozzle has a significant temperature gradient in the radial direction, whereas along the symmetry axis of the conical nozzle, the temperature increase has a linear relationship.
The results of numerical simulations are qualitatively consistent with the experiments conducted in a quartz reactor cooled by water, which made it possible to use a variety of gas and gas-liquid mixtures to select fuel with the optimal composition of components. Preliminary data obtained on a working stand with a thermal power of a quartz reactor not exceeding 4 kW are given.
To the method of calculation of the main characteristics of promising booster electric pump units of liquid processor engines
Authors: Dubynin Pavel A. , Tolstopyatov Mikhail I. , Zuev Aleksandr A. , Chernenko Valentina V.
Published: October 2024

The increase in the capacity of electric power sources, the use of electric motors in the systems for supplying rocket fuel components from foreign companies, the limitations on the power of classical fuel supply systems all these conditions set a trend for studying the possibility of introducing electric drives for rocket engine power systems.
The study is devoted to the analysis of the possibility of using electric motors as a drive for the main and auxiliary pumps of liquid rocket engines. Promising developments in the field of rechargeable batteries give grounds for a mathematical justification for the use of this technical solution in order to modernize power systems, both existing rocket engines and samples under development.
The article presents a selection of patents for modern technologies for creating high-capacity batteries, an analysis of the use of technology for the use of electric motors in the international market for delivering payloads to orbits, and a rationale for the prospects of this direction in the development of rocket engines. The statistics of the causes of failures of upper stages and their correlation with units, which can be replaced by more reliable systems using electric motors, have been studied. The advantages and disadvantages of power supply systems with the use of electric drives are determined.
This study allows us to conclude that the use of electric motors in rocket engine power systems is a promising solution that improves the efficiency of the propulsion system, performance and reliability.
Influence of physical and chemical properties of cutting fluids on the cutting force of the cutting process
Authors: Gaifullin Ilnur I. , Plaksin Alexander M. , Piunov Valery Y.
Published: October 2024

The problem of providing increased accuracy without sacrificing productivity is encountered in almost all machine-building enterprises. cutting fluids affect the entire process of blade processing: they remove heat from the surface of the cutting tool, form an additional surface between the surfaces of the cutting tool and the workpiece, and affect the juvenile surfaces of the workpiece by means of a wedging action. The positive effect of cutting fluids is achieved only if they are rationally chosen. Currently, the choice of technological environments is based on some legislative standards of the enterprise. The market for cutting fluid has a large number of brands, which makes the decision more difficult. Сutting fluids give only a qualitative assessment of their brands based on their functional actions. A similar problem of choosing a rational brand of cutting fluids was also encountered in the manufacture of the innovative Fregat and Fregat-SB accelerating units. During the processing of the structural materials previously mentioned, the impact of cutting fluids was evaluated using an experimental method. The equipment for the experiment was machining center. The methodology for the experiment included external turning at different cutting speeds and feeds of the cutting tool. Free-falling jet irrigation was chosen as the method of supplying the cutting fluids. The cutting forces were measured under the action of various cutting fluids. On the basis of the experiment, regression dependences of the physicochemical properties of cutting fluids on cutting conditions were compiled. Subsequently, according to the regression dependencies, it is possible to select the optimal brand of the cutting fluids, taking into account the cutting forces in various cutting modes.
Using of the contour method to solving the problem of optimal traffic dis-tribution in the network
Authors: Gaipov Konstantin E. , Kuznetsov Alexander A. , Krikunov Ilya L.
Published: October 2024

The purpose of this work is to create a method for solving the problem of optimal traffic distribution in a network using the contour data analysis method. In the first section of the work, the principle of converting any available network to a contour form is explained, and the case is considered both for networks without loss and for networks with losses. The second section shows in a general way the method of bringing the network in contour form to a system of non-linear inequalities, by solving which one can obtain a certain distribution of traffic in the system. In the final section, using the M/M/1/N queuing system as an example, the solution of the problem of optimal traffic distribution according to the loss minimization criterion is shown. The initial data for the task were the incidence matrix, service intensity and buffer dimension for communication channels. A feature of the proposed algorithm is the search for a contour matrix, for the compilation of which it is proposed to use loss edges as elements of the spanning tree of the graph, which allows you to immediately determine the contour matrix using the concept of a fundamental cycle of a graph. This approach to optimal traffic distribution reduces the number of variables used compared to the known methods based on loopless routes, and also does not require their preliminary search, since they are determined from the dimension of the incidence matrix of the simulated network graph.
Research of a method based on the local deformation of the metall mesh by the force of air drawn through its surface, for measuring and controlling the tension force of the metall mesh cavity on radio-reflecting reflectors
Authors: Gracheva Evgeniya A. , Sin'kovskiy Fedor K.
Published: October 2024

This article presents some of the main parameters of the netfold that affect the radio-reflective properties of the reflector and the technology for achieving these parameters by controlling the tension force of the netfold at various stages of manufacturing the radio-reflective surface of the reflector. The article also includes a brief overview of the existing and applied methods of measuring and controlling the tension force of the reticular reflectors of spacecraft at the RESHETNEV JSC enterprise and an analysis of their shortcomings as a result of their development is presented. A new method for monitoring and measuring the tension force is proposed, based on the local deformation of the mesh by the force of the pressure of the drawn air through its surface. The results of the development and testing of the method and prototype of a device for monitoring the tension force of the net are presented. The purpose of the study was to determine the operability of the device and the possibility of its further use to control the tension of the grid on working reflectors.
The developed method and the prototype of the device that implements it, allow you to quickly monitor the tension force of the net pole at any of its spatial position.
The prospects of possible use of the method in the rocket and space industry in the manufacture of radio-reflecting surfaces of spacecraft antennas are proposed and analyzed. According to the results of the conducted research, the dependence of the tension force of the mesh on the force of the pressure of the drawn air through the mesh is established. The need for further refinement of the developed device to improve the accuracy of obtaining measurement data has been identified.
Upon successful testing of the modified device for measuring and controlling the tension force of the net in the laboratory, further tests will be carried out at the stage of cutting the net and on the net in the reflector.
On an alternative method for testing the dynamic strength of a small space-craft structure
Authors: Igolkin Alexandr A. , Filipov Alexandr G.
Published: October 2024

This article presents an analysis of the possibility of applying an alternative approach to testing the mechanical effects of the design of a small spacecraft for remote sensing of the Earth, which has an analog product that has passed a full cycle of ground experimental testing. However, despite the similar power scheme and the maximum borrowing of onboard equipment with minimal modifications, the spacecraft planned for testing has a number of significant differences. The application of the main alternative strategies in foreign and domestic practice in the ground-based experimental development of space technology is considered, their advantages and disadvantages are described. Some criteria for decision-making on the rejection of the use of traditional methods of ground-based experimental testing of space technology for mechanical effects are given.
The analysis of the normative and technical documentation adopted in the domestic industry in terms of clarifying the list of development tests of spacecraft, the assumptions of applying the computational and experimental method to the development of dynamic (vibration) strength and the analysis of the design of the spacecraft planned for testing in comparison with an analog product showed that the most preferred method of testing dynamic (vibration) strength is the strategy “protocol qualifications”. In accordance with the chosen strategy, a list of tasks was defined that will clarify the nomenclature of the development tests of the research object.
Automated system for cleaning liquid waste products for closed ecosystems for space purposes
Authors: Trifonov Sergei V. , Tikhomirov Alexander A. , Murygin Alexander V.
Published: October 2024

Ensuring human life activity for several years in isolated conditions of future Martian and lunar bases is possible with the organization of a circular process of converting organic waste, including human exometabolites (cal, urin), into the products he needs: water, oxygen and food. A promising way to organize such a circular process is to create a three–link closed ecosystem (CES): a person, a link for obtaining fertilizers from organic waste and plants - where plants synthesize the products necessary for a person. The paper considers the original scheme of a complex installation for the purification of liquid products of processing of human exometabolites from pollutants in the process of obtaining nutrient solutions for growing plants in a CES. The processing of human exometabolites was carried out in a device for physicochemical oxidation of hydrogen peroxide in an aqueous medium under the action of alternating electric current – in a “wet” combustion reactor. Peripheral equipment was selected for the organization of the automatic control system of the cleaning plant, problems were identified and approaches were developed in the automation of technological processes and the creation of software for human interaction with the proposed installation. Experiments on the cultivation of lettuce plants have been carried out, confirming the effectiveness of the proposed processes of purification of liquid products of processing of human exometabolites. It is concluded that the created integrated cleaning plant, equipped with the proposed software, can be used for scientific research in relation to the subject of CES, including space purposes.
Parameters of rocket engine chambers, obtained by selective laser fusion
Authors: Zhuravlev Viktor Yu. , Manokhina Elvira S. , Shinkarev Matvey A.
Published: October 2024

When designing and testing a low-thrust rocket engine (SLME), one of the most important tasks is to ensure the quality of materials, which, in turn, affects the reliability of the product. Currently, additive technologies for manufacturing parts from metals are actively developing. This direction is relevant for rocket and space technology products to reduce weight and increase the reliability of products. The article presents the results of studies of the chemical composition and mechanical characteristics of the material of the low-thrust rocket engine demonstrator chamber, manufactured by selective laser fusion from metal powder. The properties of products made from Inconel 718 metal powder were studied. Samples were made and the chemical, mechanical and structural characteristics of the material were studied. Based on the test results, two RDMT samples were printed. RDMT chambers were tested for vibration loads, strength and tightness. Increased porosity and roughness of the test material of the engine chamber were noted. When analyzing a number of parameters of the selective laser fusion technology, an experimental selection of printing parameters was carried out and the most significant factors affecting the print quality (surface roughness and porosity) were identified. Based on the results of the work carried out, four groups of controlled printing parameters were identified that affect the properties of the resulting material. The work also provides recommendations on printing modes and characteristics to obtain the highest quality parts.
Magnetic capacity in manganese sulfides with rare earth substitution Mn1–xRexS
Authors: Kharkov Anton M. , Bandurina Olga N. , Aplesnin Sergey S. , Voronova Evgenia G.
Published: October 2024

Polycrystalline samples Mn1–xGdxS and Mn1–xYbxS with a concentration x = 0.2, near the concentration of ion flow through the fcc lattice, are studied in order to determine fluctuations in the valence of the ytterbium ion on dielectric properties. Dielectric constant and dielectric losses were determined from measurements of capacitance and loss tangent in the frequency range 102–106 Hz at temperatures of 80–500 K without a magnetic field and in a magnetic field. The magnetic capacity and dielectric losses in the magnetic field of the sample were determined from the relative change in the real and imaginary parts of the dielectric constant of the sample in a magnetic field H = 12 kOe applied parallel to the capacitor plates. A temperature range with a sharp increase in dielectric constant and with a maximum dielectric loss has been discovered, which shifts with increasing frequency and magnetic field. An increase in dielectric constant and dielectric losses in a magnetic field above 170 K was found in Mn1-xYbxS. The increase in dielectric losses is explained by an increase in relaxation time, as a result of local deformations near ytterbium ions during valence fluctuations. The mechanism for reducing reactance in a magnetic field in Mn1–xYbxS at low frequencies due to capacitance, and at high frequencies due to inductance, has been determined. In the Mn0.8Gd0.2S compound, the imaginary part of the dielectric constant has two maxima. The low-temperature maximum shifts in a magnetic field towards high temperatures and is described in the model of localized electrons with freezing of dipole moments. Dielectric losses decrease in a magnetic field. The magnetic capacity decreases by an order of magnitude in Mn0.8Gd0.2S compared to Mn0.8Yb0.2S. The dielectric constant in both compounds is described in the Debye model with the activation dependence of the relaxation time on temperature, where the activation energies differ for ytterbium and gadolinium ions.
Verification of thermodynamic parameters of a mixture of generator gas on oxygen-hydrogen fuel with an excess of one of the fuel components
Authors: Belyakov Vladislav A. , Vasilevsky Dmitry O. , Maslov Daniil V. , Kilyashov Artemy A. , Romashko Roman V.
Published: October 2024

Liquid gas generators (LGG) are additional firing units in the power system of liquid rocket engines (LPRE). The LGG ensure the operation of the power units of the turbopump unit (TPU) of the engine by feeding combustion products (CP) to the turbine drive.
The main criteria for the efficiency of the generator gas is the complex (RT)gg and the thermodynamic properties of the mixture, depending on temperature, pressure, the degree of excess of the oxidizer and the enthalpy of the fuel, attributed to the conditions of supply to the nozzles of the GG. Changing the parameters of the generator gas leads to a change in the turbine power parameters due to its effect on the adiabatic operation of the Lad turbine. Depending on the engine circuit under consideration, CP GG can perform work in other units and elements of the engine, as well as influence many parameters of the LPRE. Among the main ones can be noted:

the power of the booster gas turbine of the booster turbopump unit (BTPU) in the case of the selection of the generator gas after the GG or turbogas after the main turbine;
the temperature of heating the refrigerant in the heat exchanger introduced in the GG;
specific impulse of a liquid rocket propulsion system (LRPS), depending on the quantity and properties of the turbogas entering the exhaust pipe of the engine (for the engine circuit without afterburning the generator gas);
mixing in the combustion chamber (CC) due to afterburning of turbogas entering the engine chamber after the turbine (for the engine circuit with afterburning of generator gas);
parameters of the firing wall of the engine in the case of using a high-temperature gas curtain by blowing generator gas into the supersonic part of the nozzle.

For many pairs of fuel during combustion in GG, the nonequilibrium of combustion products is characteristic (especially in hydrocarbon fuels).Due to the fact that the combustion products (CP) during the combustion of an oxygen-hydrogen mixture, due to the simplicity of the reaction, have time to form while staying in the GG (i.e., the time of chemical equilibrium of the CP is less than or equal to the time of stay in the GG), their thermodynamic parameters can be reliably determined using programs that simulate chemical equilibrium reactions.
In this article, the issue of obtaining reliable results of thermodynamic calculations of generator gas at low and high coefficients of oxidant excess is investigated. Verification of parameters obtained in the programs “Astra” and “Rocket Propulsion Analysis” with calculated values was carried out. The most suitable program for performing engineering calculations and modeling the thermodynamics of liquid gas generators has been determined.
Issues of ensuring the resistance of high-voltage solar arrays of spacecraft to the effects of secondary arc discharges
Authors: Valiullin Valery V. , Kochura Sergey G. , Maximov Igor A. , Nadiradze Andrey B.
Published: October 2024

We have considered the issues of ensuring the resistance of high-voltage solar battery (SB) of spacecraft to the effects of secondary arc discharges. Research in this area has been going on for more than 50 years, but the answer to all the questions has not yet been found. First of all, this is due to the complexity of the electrophysical processes occurring on the surface of the spacecraft in space and in laboratory conditions. The second reason is the random nature of secondary vacuum arc discharges, which requires the use of special test methods to confirm the effectiveness and reliability of selected design and technological solutions. Tests in conditions close to full-scale conditions do not allow us to solve this problem. We have given a retrospective review of publications on the physical features of secondary arcs arising on SB of spacecraft, the mechanisms of their initiation, experimental research and testing methods. We paid considerable attention to the issues of the occurrence of secondary arc discharges SB of the spacecraft in the conditions of ionospheric plasma and plasma generated by electric propulsion thrusters. We have shown that despite the large amount of accumulated data and knowledge, the transition from low-voltage SB to high-voltage SB remains a difficult scientific and technical problem, which requires additional research to solve. In addition, it is already necessary to start training personnel who possess a wide range of knowledge and are able to work on this topic. To do this, it seems advisable to organize sectoral research, as well as the allocation of targeted funds for the training of highly qualified specialists and their independent research. This approach will make it possible to solve the problem of creating high-voltage SB in the shortest possible time and prepare personnel for the development of this technology.
Ensuring durability and reliability of contact rings of current collection devices when working in elastic-plastic state
Authors: Grishin Anton A.
Published: October 2024

The reliability of ring current-collecting devices during a given service life plays a decisive role in the opera- tion of power supply systems of various equipment and largely depends on the strength and reliability of all its components, in particular, contact rings. One of the most important characteristics of ring current collectors is the contact resistance, which is reduced by using non-ferrous and precious materials with low resistance, while increasing the downforce between the rings of the current collector. With an increase in the compression force F of the contact ring, the resistance of the contacts decreases to a certain minimum value and practically does not decrease with further growth of the force. The dependence of the contact resistance on the compression force has the form of a power function, the coefficients of which are determined experimentally.
However, the operability of the contact rings in such severe conditions can be ensured in the case of low speeds and a small number of loading cycles by using the low-cycle fatigue area on the Weller curve. Having determined the coefficients of the equation of the inclined section on the Weller curve in the area of low-cycle fatigue, it is possible to determine the number of permissible loading cycles at a given stress level or solve the inverse problem of determining the permissible stress level if the number of loading cycles is known. To substantiate the correctness of the selected compressive force and the corresponding stresses, methods for calculating the fatigue margin coefficient, as well as a method for calculating the reliability of the ring material, are proposed. Reliability is estimated by the Gauss curve and is numerically expressed in the form of the probability of failure-free operation and the probability of failure, for which the corre- sponding theoretical dependencies are obtained.
According to the proposed methods, calculations of the rings of the current-collection device used in EX- PRESS-type spacecraft were performed, which showed the operability of the methods and allowed to ensure the required service life of the contact rings and their reliability. A very simple analytical formulation of the methods allows us to solve both verification and design calculations of rings, depending on the task at hand.
Using the principle of gravitational stabilization and orientation in the design of small spacecraft
Authors: Еsina Polina Alekseevna , Kornev Vladimir M.
Published: October 2024

Currently, most small spacecraft (MCAS) are becoming increasingly relevant in the modern space industry. To successfully complete the tasks assigned to them, the ICS must be oriented in some way in space relative to the Earth. The orientation and stabilization system (SOS) is responsible for this task, which is necessary for monitoring and controlling the position of the MC in space.
At the moment, the tasks for the MCA basically do not require complex turning maneuvers and high orientation accuracy, therefore passive and combined SOS have become widespread for them. Such systems have a long service life, are characterized by simplicity, high reliability and low weight. One of the typical systems used in modern space technology is gravity systems. The principle of gravitational SOS is based on the use of gravity acting on a body and moments of inertia relative to three mutually orthogonal axes.
This article proposes a 3U CubeSat ICA project with a gravitational orientation system. The design of such a satellite requires a gravitational stabilization device, which is necessary to deploy the ICA after separating it from the launch vehicle, as well as to create a restoring moment. The gravitational device is supposed to be placed between the rigidly bonded 2U MC and the third U MCA.
The advantage of this design is the fact that it becomes possible to place more payload on the MC without overloading it with various devices for the orientation and stabilization system.
Clarification of the plastic deformations zone borders for the fuel tank diaphragm
Authors: Klimovskiy Dmitriy Andreevich , Zhuravlev Viktor Y.
Published: October 2024

A relevant area of theoretical and practical research in the field of rocket science is ensuring the uninterrupted and reliable operation for liquid rocket engines. Reliable operation and engine start in zero gravity is impossible without guaranteed separation of the liquid and gas phases in the fuel tank. This problem is solved by the introduction of metallic reversible diaphragm separators. The eversion process research for the metal diaphragm separators allows you to design them for fuel tanks of various sizes and shapes according to the specified parameters of the displacement of the component. This is an actual object of research.
The known mathematical dependencies do not have sufficient accuracy and correspondence to experi- mental results. To improve the quality of design when using any deformation-energy approach, it is necessary to increase the accuracy of determining the boundaries for plastic deformation zone of diaphragms at various stages of eversion. Clarification of the boundaries for this zone is possible using modern computer modeling tools.
The article provides a descriptions and simulation result for metal diaphragms with different geometric parameters, loaded with uniform pressure, taking into account the plastic material properties in the MSC NASTRAN software package. As a result of the work, a refined zone of plastic deformation for fuel tanks metal eversible diaphragms was determined. We have introduced new angles to describe this zone. The dependences for these angles on the angle of the torus region, independent of the geometric parameters of the diaphragm, were obtained. We also identified the conditions under which the use of the energy principle equation is inappropriate due to the presence of membrane stresses.
Automation of control of geometrical characteristics of worm and bevel gears by means of coordinate measuring
Authors: Karabontseva Maria V. , Brizhinskaya Nadezhda V. , Levko Valery A.
Published: October 2024

The article contains the results of research on the automation of control of the geometric characteristics of gears. The use of coordinate measuring machines can significantly improve the productivity and accuracy of measurements. However, their use for testing gears requires the use of special programs for carrying out and processing the results of measurements of products with complex surface shapes. The use of software for metrological control of the geometric characteristics of worm and bevel gears makes it possible to achieve high accuracy of control and measurement work. To automate the control of geometric characteristics of worm and bevel gears, an additional module has been created for the standard program. With its help, all points of the measured curved surface of gears, obtained by contact method according to a standard measurement program, are structured into a single data array with a measurement protocol. Based on these data, the module generates a profile of the measured surface of a wheel tooth and builds a geometric contour of the profile of the measured tooth. The result of the module's operation is the formation of a general profile of the entire gear and its comparison with the original (theoretical) profile of the gear as a whole. The control process itself is carried out in a short time interval, which makes it possible to use the proposed approach to automating the control of gear profiles in small-scale production.
Manual de produções científicas do curso de medicina da Universidade do Estado do Pará
Authors: Brito Caio Vinicius Botelho , Novoa Thais dAvila , Furtado Danielle Moreno F. , Palacios Vera Regina da Cunha Menezes , Botelho Nara Macedo
Published: October 2024

O e-book “Manual de produções científicas do curso de medicina da Universidade do Estado do Pará” se propõe a ser uma valiosa ajuda para os discentes do curso de medicina da nossa universidade. Este Manual foi desenvolvido em parceria com professores e alunos com a finalidade de ensinar o passo a passo da pesquisa científica dentro da área médica, desde como formular a dúvida inicial de pesquisa até como publicar um artigo em uma revista especializada. A obra também apresenta dicas muito práticas de como otimizar as apresentações de trabalhos científicos, além de como fazer extensão universitária.
Jornada de Cuidados: 80 Anos de Excelência em Enfermagem
Authors: Leite Maridalva Ramos , Souza Maria Liracy Batista de , Dias Bruna Rafaela Leite , Silva Ricardo Luiz Saldanha da , Duarte Breno Augusto Silva
Published: October 2024

A EDUEPA tem o prazer de apresentar o e-book intitulado “Jornada de Cuidados: 80 Anos de Excelência em Enfermagem”. Este e-book não é apenas uma coletânea de artigos; é um convite à exploração das diversas facetas da Enfermagem no século XXI, um campo em constante evolução que merece ser celebrado e aprofundado. Com a honra de integrar a programação festiva dos 80 anos da Escola de Enfermagem Magalhães Barata, esta publicação se propõe a iluminar a trajetória do conhecimento nos últimos dez anos, apresentando uma visão abrangente sobre a prática de enfermagem. Os textos estão organizados em três eixos temáticos, cada um deles refletindo a riqueza e os desafios da profissão. O Eixo 1 expõe os desafios enfrentados pelos profissionais de enfermagem na multifacetada região amazônica, explorando as particularidades e as demandas que surgem deste contexto único. O Eixo 2, por sua vez, reúne estratégias inovadoras de promoção da saúde e prevenção de doenças, evidenciando o papel vital do enfermeiro na comunidade. Por fim, o Eixo 3 destaca as inovações tecnológicas que estão moldando o futuro da enfermagem na Amazônia, reafirmando o compromisso da profissão com a modernidade e a excelência. Os autores desta coletânea são professores, estudantes, gestores e enfermeiros que, movidos por um profundo senso de responsabilidade social e acadêmica, se lançaram na empreitada de compartilhar suas experiências e conhecimentos. Cada artigo é um testemunho da preocupação com a realidade da saúde e do rigor teórico que fundamenta a busca pela transformação. Assim, este e-book não se limita a ser um simples registro da formação profissional; ele se estabelece como um marco na história da enfermagem no Pará. É uma fonte riquíssima de temas contemporâneos, constituindo-se como uma base sólida para estudos, pesquisas e práticas assistenciais. Convidamos você a embarcar nesta jornada extraordinária rumo à excelência do conhecimento e à ação transformadora dos profissionais de enfermagem.
Serviço de Apoio Psicológico e Pedagógico ao Estudante – SAPPE: 15 anos de atividades na Universidade do Estado do Pará – UEPA
Authors: GONÇALVES ONELI DE FÁTIMA TEIXEIRA , DINIZ CAETANO DA PROVIDÊNCIA SANTOS , OEIRAS MICHEL FRANÇA
Published: October 2024

A atenção à saúde mental assume uma relevância sem precedentes nos dias atuais. Em um universo cada vez mais dinâmico e exigente, os desafios enfrentados pelos estudantes universitários se apresentam em grande número e complexidade. A pressão acadêmica, as incertezas sobre o futuro profissional e as questões de ordem pessoal têm o potencial de afetar de maneira severa o bem-estar emocional. É com base nessa realidade que e-book “Serviço de Apoio Psicológico e Pedagógico ao Estudante – SAPPE: 15 anos de atividades na Universidade do Estado do Pará – UEPA” foi pensado para abordar essas questões com profundidade, oferecendo insights preciosos e estratégias práticas que visam fomentar um ambiente universitário mais saudável e acolhedor. Esta obra não apenas celebra o sucesso e a dedicação do Sappe ao longo desses 15 anos, mas também se configura como um recurso valioso para profissionais das áreas de educação e saúde mental. Oferece diretrizes e reflexões que podem ser aplicadas em contextos análogos, promovendo um ambiente acadêmico saudável e inclusivo. Almejamos que este livro inspire futuras iniciativas, contribua para o aprimoramento do apoio e atendimento aos estudantes em instituições de ensino superior brasileiras, e funcione como um marco de reflexão, aprendizado e inspiração para todos aqueles que reconhecem a importância de um ambiente acadêmico saudável e inclusivo.
Airflow Characteristics in Conveyor Type Damper for Hot Air Temperature Changes
Authors: Chae Yong-Gyu , Won Hyun-Woo , Cho Dong-Hyun
Published: October 2024

The aim of this study was to present the characteristics of a hot airflow in a conveyor type dampers under the hot air temperature changes. The amount of space occupied by the damper was reduced by 50 %, and by efficiently managing the damper's airflow rate even in the face of extreme external conditions and constant air volume proportional control, a conveyor-type damper with a significant energy-saving effect has been explored. It was configured to control the degree to which it was opened by operating the folding conveyor drive mechanism, enabling the damper to modify airflow. In this study, the mass flow rate of heated air through the conveyor-type damper increased in proportion to the damper port's expansion. The mass flow rate of air decreased as the temperature of air intensified. In addition, the thermal energy of the air flowing in the conveyor-type damper improved in ratio to the increase in the damper opening. The findings indicate a 50 % reduction in the damper's occupied space, indicating a significant energy-saving impact of the conveyor-type damper. This is because the damper's air volume is effectively controlled even in the face of severe external conditions, as it is proportionately controlled throughout. The understanding of the properties of airflow for the hot temperature change is strengthened by this research. Furthermore, this study may provide useful direction for future research and industry optimization.
La noción de ‘supremacía de la ley’ en el discurso estudiantil de la Escuela Nacional de Jurisprudencia, 1870–1875
Authors:   El Colegio de Michoacán, Tepos Navarro Hans
Published: October 2024

In the second half of the 19th century, modern law emerged in Mexico, characterized by constitutionalism, codification, and the ‘supremacy of law’, among other notions. The latter concept was developed in various undergraduate theses written by students at the National School of Jurisprudence in order to justify the role assigned to law and the State. However, these documents have been scarcely addressed by historiography. The purpose of this article is to reconstruct the arguments presented in a set of dissertations, from which the notion of ‘supremacy of law’ was partially shaped. The argument put forward here aims to demonstrate that a group of students appealed to legal, historical, and philosophical foundations to show that obedience and submission to the rules were essential for achieving political stability
Electromagnetic fields transformation in UWB infinite antenna arrays in the cluster excitation mode
Authors: Bankov S. E. , Duplenkova M. D.
Published: October 2024

Infinite ultra-wideband (UWB) arrays of TEM horns and Vivaldi antennas were considered. At the first stage we used an array model in the quasi-periodic excitation mode in the form of a Floquet channel. It was implemented in the HFSS electromagnetic modeling system. At the second stage the array parameters in the cluster excitation mode were determined using the calculated scattering matrix of the Floquet channel. Two clusters of TEM horns and Vivaldi antennas were analyzed. They were finite along one coordinate and infinite along the other. It was investigated how the cluster size, frequency, amplitude distribution of exciting waves, scanning in the sector of angles affect the shape of the amplitude-phase distribution of the field in the array aperture. It was shown that the field distribution in the emitting aperture may differ significantly from the distribution of exciting waves at the inputs of the array elements. An explanation of this effect based on the representation of the field in the array in the form of a superposition of its eigen waves was proposed.
Bifocal system of two reflect arrays
Authors: Kaloshin V. A. , Tuan Trinh Van
Published: October 2024

A technique has been developed for accurately solving the problem of geometric-optical synthesis of a bifocal system of two flat reflect arrays, based on the sequential determination of the distribution of the eikonal introduced by different sections of the arrays, with its assignment at the initial section of one of the arrays, while the introduced eikonal at the initial section of the other array is found as a result of synthesis of the output flat front for the central position of the feed. The technique ensures the continuity of functions describing the distributions of introduced eikonals, as well as their first and second derivatives (along one coordinate) at the boundaries of sections. The dependence of the value of the mean square eikonal aberration at the system output on the arrays parameters has been studied. As an example of the application of the developed technique, the bifocal systems for visual angles of 40°and 65°were synthesized and optimized. A study of the radiation characteristics of an antenna based on synthesized and optimized bifocal systems was carried out.
Rapid detection of A-type botulinum toxin using an aptasensor and SERS
Authors: Ambartsumyan O. A. , Brovko A. M.
Published: October 2024

We described the development of a biosensor for the rapid and sensitive detection of botulinum toxin type A. The sensor is a SERS substrate with an optimized concentration of labeled aptamers, immobilized on its surface. It allows the detection of botulinum toxin type A with a detection limit of 2.4 ng/ml in 1 hour.
Temperature dependences of the magnetic anisotropy constants of single-crystal inclusions MnSb in an InSb matrix
Authors: Dmitriev A. I. , Kochura A. V. , Kuzmenko A. P. , Htet Aung Zaw , Rodionov V. V. , Marenkin S. F. , Aronzon B. A.
Published: October 2024

The contributions of the first order K1 and second order K2 magnetic anisotropy constants to the effective constant are separated. Their competition determines the type of magnetic anisotropy «easy plane». Extrapolation of the dependences K1(T) and K2(T) to the region of high temperatures made it possible to predict the temperature TSR = 570 K, which corresponds to the spin-reorientation transition, at which the easy-axis magnetic anisotropy is formed.
Magnetism and magnetic phase transition in nanowires of diamagnetically diluted superstrong magnets ε-In0.04Fe1.96O3
Authors: Dmitriev A. I. , Dmitrieva M. S.
Published: October 2024

The temperature dependences of the magnetization of ε-In0.04Fe1.96O3 nanoparticles were measured in the cooling and heating regimes. At a temperature of 150 K, a sharp drop in their magnetization is observed. Evidence is obtained that the observed magnetic phase transition is accompanied by a reversal of the magnetization due to a first-order spin-reorientation transition. The experimental results are described in terms of the thermodynamic approach.
Photon echo on excitons for the development of nanoelectronic devices based on a quantum-size structures in a thin zinc oxide films
Authors: Popov I. I. , Yusupov R. V. , Petrov A. V. , Bessonov A. R. , Gaia A. M. , Moroz A. V.
Published: October 2024

The relaxation decays of photon echo signals in thin zinc oxide films produced by magnetron sputtering have been studied. Echo signals are excited at a wavelength of 800 nm at transitions between quantum levels that arise when excitonic states are localized in quantum-sized structures in the two-photon absorption mode of laser pulses with a wavelength of 800 nm.
Long-lived recurrent fluxes of energetic ions from solar coronal holes
Authors: Zeldovich M. A. , Logachev Yu. I.
Published: October 2024

The results of studying the relative abundances and energy spectra of 4He, C, O, and Fe suprathermal ions in particle fluxes from long-lived near-equatorial coronal holes are presented. It was found that the ion energy spectra had a power or exponential form and, in a number of events, increased particle fluxes were observed in the region of ion energies (~0.2–1.5 MeV/nucleon), creating a fracture in the spectra, which may be due to additional ions accelerated beyond 1 au.