bluuebunny/crossref_metadata_2025 huggingface dataset:
ELECTROMAGNETIC FIELD IN THE AIR GAP OF THE «ROTOR – STATOR» SYSTEM OF A RADIAL ELECTROMAGNETIC BEARING
Authors:   Perm National Research Polytechnic University, Makhnutin Aleksey , Salnikov Aleksey ,   Perm National Research Polytechnic University
Published: February 2023

A particularly responsible, pronounced assembly unit of the turbine unit is the manufacturer, which has the severity of variable interdependent and mutually influencing boundary conditions that cause the impact on the gas environment, the sharply deformed state of the rotor element base, the oscillatory circuit, the imbalance and the magnetic strength of the electromagnetic support. The constant increase in the rotation speed, the increase in the importance of the structural element of the turbomachine rotor, as well as the reduction in weight and dimensions, bring the increase in the service life of bearing supports to the first place. it can be noted that modern turbine units are consumed in supports, which cause a stable and increased rotor speed in any modes and in any environment. The article considers in a plane-parallel setting numerical simulation of a complexly identified problem of field scattering in the air gap of the "rotor-stator" system of a radial electromagnetic suspension, from the composition of a centrifugal supercharger, with centrifugal rotor levitation, taking into account the radial displacement of the rotor axis during rotation. Based on the results of the calculation, the distribution of the distribution of electromagnetic fields was determined during the weighing of its rotor and during radial displacement and rotation.
NUMERICAL MODEL OF FIRE PERMEABILITY OF GTE ELEMENTS MADE OF ALUMINUM ALLOYS
Authors:   PJSC «UEC-Saturn», Mikheeva Maja , Khantalin Dmitriy ,   PJSC «UEC-Saturn», Shepel Vyacheslav ,   PJSC «UEC-Saturn»
Published: February 2023

For the early stages of design, a numerical model of fire resistance and fire permeability of GTE elements made of alu-minum alloys is proposed. The numerical model is based on the solution of three-dimensional Navier-Stokes equations, closed by a two-parameter isotropic SST – turbulence model. We used an implicit pressure solver and a scheme of second-order accuracy in High Resolution space, which allows lowering the approximation order to the first in the areas of solution discontinuities and high gradients to increase the monotonicity and stability of the solution. Additionally, to achieve the solution stability, the High Speed Numerics solver option was used, activating the solver settings Gradient Factor Relaxation = 0.1 and Blend Factor Relaxation = 0.1. The mathematical model for the thermal-hydraulic calculation was set up in the formulation of the coupled heat transfer, taking into account radiation based on the discrete transfer model of the Participating Media. The influ-ence of the degree of blackness on the results of the numerical model is investigated and the most rational radiation model is chosen. The numerical model was validated according to the results of engineering tests on the fire permeability of the plate not cooled by the air flow using a kerosene burner NexGen of the bench Ts17-G3 of FAU P.I. Baranov TsIAM. The obtained results of calculations on fire permeability are comparable with the experimental data both quantitatively and qualitatively. The developed un-steady numerical model of fire permeability of flat plates of aluminum alloys under conditions of free convection can be used in the de-sign of the fan housing by selecting the most rational structural and layout solutions, such as the thickness of the housing, the presence of fire protection coating, cooling intensity, etc.
INFLUENCE OF PHYSICAL PROCESSES IN PREFLAME REGION ON ALUMINUM PARTICLES COMBUSTION IN OXYGEN-CONTAINING MEDIA
Authors:   Perm National Research Polytechnic University, Kryukov Aleksey , Malinin Vladimir ,   Perm National Research Polytechnic University
Published: February 2023

The processes in preflame region while combustion of aluminum particles in media «79% Ar + 21% O2» и «79% Не + 21% O2» were analyzed. The necessity of oxygen dissociation taking into account for explanation of effect of physical processes on particles rate of combustion is proved. The calculations are implemented for particles of diameter 220 m and ambient pres-sure p=0,1 MPa provided that quasistationarity and symmetry of processes. Values of concentration of dissociating oxidizer on the flame boundary are established to be lower than those calculated without dissociation taking into account (in 2,5 times lower for combustion in helium and by 30% lower for combustion in argon). Distributions of medium temperature and concentrations of oxidizing components are obtained depending on relation of coordinates R of inner points of region to current particle radius R0. The preflame region is revealed to be in the range of 2,4R/R05,1 for burning in helium and to be in the range of 15R/R06,9 for burning in argon. The results of analysis show necessity of molecular oxygen dissociation taking into account in the region under consideration. The results explain differencies of burning rates obtained in experiments from calculated values. Also re-sults of this work explain particles combustion rates ratio in media posessing essentially different transport coefficients.
А CHOOSE OF STRUCTURALLY-SIMILAR SAMPLES FOR FATIGUE TESTING OF POLYMER COMPOSITE AVIATION STRUCTURES
Authors:   Perm National Research Polytechnic University, Solomonov Danil , Nikhamkin Mikhail ,   Perm National Research Polytechnic University, Toropitsina Anna ,   JSC “UEC-Aviadvigatel”
Published: February 2023

This article describes a method for choosing the shape of structurally-similar elements made of polymer composite ma-terials and the scheme of their loading during fatigue tests. These tests are an important step of the complex of efforts to prevent fatigue failure of aviation critical structures made of polymer composite materials. The shape of structurally- similar elements and the loading scheme must be substantiated by a series of preliminary calculations. When testing such samples, the deformation field in the critical zone of the part must be re-produced. The ability to achieve fatigue failure of specimens on the selected equipment shall be verified. The application of the proposed approach to the justification of the choice of structure and loading of structurally similar elements is demonstrated on the example of a typical aircraft structure.
NUMERICAL SIMULATION OF PROCESSES OF INTERACTION OF A GAS WAVE AND A DEFORMED BARRIER IN A MODEL CHANNEL AIRCRAFT ENGINE
Authors:   Perm National Research Polytechnic University, Seregina Margarita , Babushkina Anna ,   Perm National Research Polytechnic University, Modorskii Vladimir ,   Perm National Research Polytechnic University, Maksimov Danila ,   Perm National Research Polytechnic University
Published: February 2023

The aim of the study is to adapt the ANSYS CFX and ANSYS Mechanical engineering analysis systems for numerical calculations of acoustic processes in the model channels of an aircraft engine. Numerical experiments were carried out in the 2FSI (2-way Fluid-Structure Interaction Explained) formulation, which allows taking into account the interaction between the gas and the structure. A mathematical model for gas-dynamic processes is formulated, which is based on the laws of conservation of mass, momentum, energy and is closed by the equations of state of an ideal compressible gas and turbulence. A mathemati-cal model is formulated for estimating the stress-strain state of a structure, taking into account the movement of the partition in the framework of the linear theory of elasticity. Boundary conditions are determined. The task of the study was to evaluate the influence of the choice of the type of partition material on the propagation of a sound wave along the flow to the partition and beyond. As a partition, materials were chosen that differ in the value of the modulus of elasticity and Poisson's ratio, steel, tita-nium and polyethylene. Graphical dependences of the pressure amplitude at six control points are obtained. Graphs of moving partitions depending on the type of material are obtained. Computational experiments were carried out at Perm National Re-search Polytechnic University using the computing resources of the cluster of the Center for High-Performance Computing Sys-tems.
EXTERNAL AND INTERNAL MECHANICS OF THE AIRCRAFT WITH THE SYSTEM OF DISPLACEMENT OF THE CENTER OF MASS
Authors:   South Ural State University, Mikhailov Evgenii , Fedorov Viktor ,   South Ural State University
Published: February 2023

Axisymmetric aircraft can be adversely affected by asymmetries of various types, such as mass asymmetry, aerodynamic and combinations thereof. This influence can manifest itself in off-design modes of motion, increased overloads, and trajectory deviation. On the other hand, the deliberate introduction of asymmetry, in particular mass asymmetry, can compensate for the neg-ative impact of both mass-inertial and aerodynamic asymmetries, and will also allow the creation of aerodynamic forces for spatial maneuvering. This can be implemented using the center of mass displacement system installed on board the product. The paper presents the results of a study of the motion of an aircraft with a center-of-mass displacement system. This sys-tem is implemented in the form of a balancing load fixed on a movable platform with a drive based on a mechanism with parallel kinematics of the hexapod type. The considered design generally provides 6 degrees of freedom of the balancer – three linear movements of the center of mass relative to the aircraft frame and three angles of rotation of the balancer around its center of mass. This allows displacement the center of mass of the aircraft and compensating for three centrifugal moments. A mathematical model for determining the mass-inertial characteristics of an aircraft is presented, describing the structure as a system of two sol-ids: the body is a balancer. A scheme is proposed for changing the position of the balancer to displacement the center of mass of the system and compensate for centrifugal moments. The case of a transverse displacement of the center of mass of the aircraft along the axis of the coordinate system associated with the aircraft frame according to the law, allows the aircraft to be installed in the equilibrium position at the required angle of attack is considered. The mass-inertial characteristics of the aircraft over the entire period of time of the displacement of the center of mass are determined. The inverse kinematics problem for determining the lengths of the rods of a movable platform is solved.
LOW-EMISSION COMBUSTION CHAMBERS AND COOLING SYSTEMS
Authors:   Perm National Research Polytechnic University, Kharlina Ekaterina
Published: February 2023

A modern gas turbine engine must meet a large list of requirements that are included in the parameters, resource and per-formance indicators. To increase the service life of a gas turbine engine at elevated temperatures of the gas flow, it is expendable to use thermal barrier protection on explosive structural materials. Cyclic tests of materials and thermal barrier coatings of gas tur-bine engines at temperatures above 1500 ºС are proposed to be carried out on a stand in which a hot gas flow is generated by an air-methane burner. In order to reduce the emission standards for nitrogen and carbon oxides, it is necessary to develop and use in stationary gas turbine engines fundamentally new technologies for organizing combustion and, as a result, designs of combustion chambers. From a detailed analysis of the current requirements, it follows that the newly designed low-emission combustion chamber for advanced gas turbine engines and installations should be accompanied by an increase in gas temperature by 200–300 K, an increase in the durability of the flame tube by 3–4 times, with a twofold decrease in the proportion of air for cooling the walls, a twofold or more reduction in the emission of harmful substances. In this article, heat-resistant coatings of structural elements of gas turbines are considered. The concepts of low-emission fuel combustion are described by organizing the working process according to the "DLE" - Dry Low Emission scheme. As an alter-native method for organizing low-emission combustion, stoichiometric combustion is proposed, which also makes it possible to provide the required temperature of the gas jet. A review of low-emission combustion chambers has been carried out. The existing methods of cooling the combustion chambers of gas turbine and liquid rocket engines are described. The analysis of the collected information made it possible to determine the concept of designing a high-temperature air-methane burner.
ANALYTICAL DESCRIPTION OF TECHNOLOGICAL AND GEOMETRIC INITIAL DATA FOR PREDICTING THE DEFLECTION OF GAS TURBINE ENGINE COMPRESSOR VANES DURING TRANSVERSE LINE MILLING OF THE FLOW PATH ON COMPUTER NUMERICAL CONTROL MACHINES
Authors:   Perm National Research Polytechnic University, Svirshchev Valentin , Tarasov Stepan ,   Perm National Research Polytechnic University, Merezhnikov Vladislav ,   Perm National Research Polytechnic University
Published: February 2023

When milling the profile of the flow path of the vanes of a gas turbine engine on multi-axis machines, a technological scheme of transverse line shaping is used, according to which the vane is rotated around its own axis and processed with a tool with a spherical working surface that performs rotation and interpolated axial movement. The required indicators of the surface quality of the vane airfoil profile (profile accuracy and surface roughness) are provided by assigning a combination of controlled parameters of the milling mode. However, at present there are no recommendations on the calculation and assignment of a combi-nation of controlled parameters for the milling of complex-profile surfaces, which is the profile of the flow path of the gas turbine engine compressor vanes. The accuracy of the profile of the vane feather for each line and the angle of its rotation will be deter-mined by the value of the vane deformations, which should not exceed the tolerance for its manufacture. From the analysis of ge-ometric relationships in the contact zone of the mill with a spherical working surface and a curved profile of the flow path of the vane, dependencies were established for calculating the component of the milling force and its projection on the Y axis, as well as the effective diameter of the mill necessary to calculate the total deformation of the vane. The methodology is described and analyt-ical expressions are obtained for calculating and assigning a combination of controlled parameters of the milling mode that provide the required accuracy of the vane airfoil profile when developing a control program and milling a vane on a Computer Numerical Control machines.
INVESTIGATION OF THE INFLUENCE OF GEOMETRIC FEATURES OF THE FUEL INJECTORS OF A GAS TURBINE AIRCRAFT ENGINE ON THE CHARACTERISTICS OF THE SPRAY USING CONTACTLESS METHODS
Authors:   Perm National Research Polytechnic University, Aleksandrov Ilya ,   JSC “UEC-Aviadvigatel”, Krinitsyn Danil ,   Perm National Research Polytechnic University,   JSC “UEC-Aviadvigatel”, Sipatov Aleksey ,   Perm National Research Polytechnic University,   JSC “UEC-Aviadvigatel”
Published: February 2023

The experimental research of the peripheral unevenness of air-blast atomizer with different fuel sprayers has been con-ducted on a hydraulic stand. The experimental research of fuel atomizers based on laser anemometer’s readings has been con-ducted. Parameters of atomization characteristics and circular velocity have been analyzed. Based of those findings and relevant research information, hypotheses have been made that is capable to properly describe experimental results. Basic guidance’s to future investigations has been given.
RATIONAL SETTINGS OF A NUMERICAL MODEL TO SIMULATE THE WORKING PROCESS OF AN AXIAL-FILM-COOLED TURBINE BLADE
Authors:   Samara National Research University, Volkov Andrey , Popov Grigoriy ,   Samara National Research University, Baturin Oleg ,   Samara National Research University, Zubanov Vasiliy ,   Samara National Research University, Melnikov Sergey ,   Samara National Research University
Published: February 2023

To reliably determine the characteristics of cooled turbines in CFD simulation, it is necessary to take into account the inter-action of film cooling jets with the main flow. For a correct description of such processes, it is necessary to refine the grid of finite volume mesh, which requires significant resources for the calculation and high qualification of the engineer. An attempt to simplify the model reduces the reliability of the results obtained. There are no systematic recommendations in the available publications on the choice of settings for numerical models of film-cooled turbines. This paper presents results aimed at finding optimal settings for numerical models that allow accurate and cost-effective simulation of the workflow in cooled film-cooled turbines. As a result, practical recommendations were obtained on the choice of mesh parameters and turbulence models for such problems. – the value of y+ is not more than 2; – number of elements in the near-wall layer: at least 20; – cell growth factor in the near-wall layer: not less than 1.2. The use of these recommendations will make it possible to obtain results close to real ones while reducing the required time and computational costs.
INVESTIGATION OF THE EFFECT OF HYDROGEN FUEL ON THE THERMODYNAMIC PARAMETERS OF AL-31ST
Authors:   Perm National Research Polytechnic University, Frolov Yurii , Medvedev Viktor ,   Perm National Research Polytechnic University, Khramtsov Mikhail ,   Perm National Research Polytechnic University, Bulbovich Roman ,   Perm National Research Polytechnic University
Published: February 2023

The paper considers the possibility of switching the existing AL-31ST gas turbine unit from methane to hydrogen fuel. The calculation and comparison of the main thermodynamic parameters of a gas turbine installation on various types of fuel is carried out. The thermodynamic characteristics of the hydrogen plant are calculated while maintaining the gas temperature at the inlet to the high-pressure turbine. The use of hydrogen in the form of fuel will increase the efficiency of the installation, as well as reduce fuel consumption. Replacing methane with hydrogen allows you to get zero emissions of carbon-containing substances.
VIBRATION PROBLEMS IN THE TECHNOLOGICAL PROCESSES OF ASSEMBLING ROTORS WITH FREEZING SURFACES
Authors:   Perm Military Institute of the National Guard Troops of Russian Federation, Beloborodov Sergey , Modorskii Vladimir ,   Perm National Research Polytechnic University, Neverov Aleksandr ,   Perm Military Institute of the National Guard Troops of Russian Federation
Published: February 2023

The article analyzes the known solutions of vibration problems by technological methods and formulates their mathematical formulation. The direction of the research is determined and the hypothesis of solving the minimization problem is formulated. A solution is proposed to minimize the vibration parameters of rotors with periodically freezing surfaces by giving them an elastic-stressed state, the results of its testing in industrial production conditions are presented.
ENSURING DYNAMIC STABILITY OF FREEZING ROTORS BY TECHNOLOGICAL METHODS
Authors:   Perm Military Institute of the National Guard Troops of Russian Federation, Beloborodov Sergey , Modorskii Vladimir ,   Perm National Research Polytechnic University, Tsimberov Dmitriy ,   Perm Military Institute of the National Guard Troops of Russian Federation
Published: February 2023

The proposed article is devoted to artificial material systems operating in conditions of information scarcity for effective management. The problem is considered on the example of rotors operating in conditions of icing of surfaces of turbine units used in aviation and the thermal power complex. The analysis of measures to ensure the dynamic stability of rotors, whose surfaces are subject to icing, leading to an uncontrolled increase in local imbalances, is carried out. The relevance of the problem is due to both the general trend of scientific and technological progress aimed at improving technologies and types of products, and modern challenges of the economy. These should primarily include meeting the need for technological processes and types of products that are as close as possible to the requests in terms of the resource of work, cost, cost of operation and disposal. At the same time, the situation at the production site is complicated by the hostile attitude of the so-called Western countries to the development of Russian industry, especially in aviation, the thermal power complex, defense, elec-tronics, etc. All this creates a complex scientific and technical contradiction, burdened by a shortage of material support: financial inse-curity and the absence of a number of components supplied by previously unfriendly countries. Based on the results of the analysis of the dynamic state of the systems, the direction of its technological support is determined. Two methods are proposed to ensure the dynamic stability of the most problematic elements of rotors: wheels of centrifugal and axial compressors (turbines). At the same time, the method of precision preparation of rotor elements for assembly is designed to ensure the installation of the element on the shaft with minimized eccentricity of the forming seal and without imbalance, and the method of eccentricity-virtual assembly of turbine wheels is designed to balance the rotor with a pre–known imbalance. The application of the developed methods makes it possible to solve the formulated scientific and technical contradiction, significantly improve the quality of prod-ucts, reduce the labor intensity and cost of production. Technological processes using these methods have been tested in industrial conditions.
EFFECTS OF VOLCANIC ASH ON AIRCRAFT GAS TURBINE ENGINES
Authors:   Perm National Research Polytechnic University, Popova Diana ,   JSC “UEC-Aviadvigatel”, Sazhenkov Aleksei ,   JSC “UEC-Aviadvigatel”
Published: February 2023

Volcanic ash clouds emitted into the Earth’s atmosphere by more than a thousand active volcanoes pose an immediate se-rious threat to flight safety, since volcanic ash particles in high concentrations can cause significant damage to aircraft. This article presents the consequences of an aircraft getting into a cloud of volcanic ash (damage to the fuselage and aer-odynamic surfaces of the aircraft, turbojet sustainer engines, antennas, air pressure and temperature receivers, other aircraft sys-tems), and also describes in detail the mechanisms and examples of the impact of volcanic ash on various types aircraft gas tur-bine engines. The global statistics of aircraft hitting volcanic ash clouds from 1935 to 2021 is given. The results of engineering tests of PW F100 bypass gas turbine engines under the influence of volcanic ash in the condi-tions of the scientific and CalspanTechnical Corporation, founded in 1943 in the United States of America, are considered. Also presented are the results of work under the VIPR (Vehicle Integrated Propulsion Research) program of the National Aerospace Agency of the United States of America (NASA) for a comprehensive study of the impact of volcanic ash on the F-117 (PW2040) power plant of the Boeing C-17 Globemaster III military transport aircraft. The results of research by the NASA national agency and the Calspan Corporation are compared with the main data of certification tests of the advanced PD-14 aircraft gas turbine engine developed by JSC «UEC-Aviadvigatel» in the conditions of the closed ground test facility Ts-17T of the FAA «CIAM named after P.I. Baranov» in accordance with the requirements of the European Aviation Safety Agency (EASA).
MATHEMATICAL SIMULATION OF THE DRY FRICTION DAMPER FOR THE GAS TURBINE ENGINE GEAR WHEEL. PART 1
Authors:   JSC “UEC-Aviadvigatel”, Yakovkin Vadim , Nikhamkin Mikhail ,   Perm National Research Polytechnic University, Sazhenkov Nikolay ,   Perm National Research Polytechnic University
Published: February 2023

One of the ways to increase the vibration strength gas turbine engine parts is the use of dry friction dampers. The efficiency of such dampers essentially depends on the selection of their mass-rigidity characteristics, pressing force, and other parameters. For the correct choice of these parameters at the design stage, it is necessary both to understand the laws of operation of dampers and to have an adequate mathematical model of the process of interaction between the engine part and the damper. The proposed mathematical model for calculating the efficiency of dry friction dampers is based on the linearization of the described Coulomb friction processes, which is completely true for cases where only the macroslip process is presented. However, real processes of dry friction are also accompanied by microslip processes too. To evaluate the influence of the presence of microslip processes on the damping efficiency, and, as a result, on the accu-racy of the created mathematical model, an experimental assessment of the indirect hysteresis loss loops of the “damper-detail” system was carried out on a model installation. It is concluded that the damper displacement level and the surface roughness are proportional. A possibility to apply linear-ised model to full-scale components was justified by calculations. This includes the possibility to consider the microslip effects simulations and identify ways of the damper adjustment so as to minimise the influence of this effect. The results of the study are taken into account for the damped gearwheel model adjustment.
Risalah Perang Bone-Makassar: Transformasi Teks Fiksi Populer Gadis Portugis Karya Mappajarungi Manan
Authors: Kadafi Muammar , Mahmudah Budi Utami Shofi
Published: February 2023

Munculnya sebuah teks dapat menjadi respons terhadap teks lain dalam bentuk yang berbeda yang mana berkontribusi pada teks transformasi. Respon terhadap teks-teks tersebut dapat muncul pada tema, karakter, narasi, atau bahkan wacana, yang dapat dilacak pada teks hipogramnya. Hubungan intertekstualitas ini juga ditemukan dalam novel Gadis Portugis (GP) yang terkait dengan teks tradisional Sinrilikna Kappalak Tallumbatua (SKT). Namun, bentuk keterkaitan kedua teks tersebut masih perlu diteliti lebih lanjut, dengan demikian, dalam penelitian ini akan melihat lebih jauh sejauh mana hubungan intertekstualitas novel GP dengan teks SKT. Pendekatan masalah ini adalah intertekstualitas yang merupakan konsep dalam respon pembaca oleh Riffaterre. Penelitian ini merupakan penelitian deskriptif yang cenderung mendeskripsikan suatu fenomena dalam karya sastra; dan juga tergolong sebagai penelitian kualitatif di mana teknik interpretatif digunakan untuk mendekati sebuah fenomena. Hasil penelitian ini menunjukkan bahwa adanya penggambaran perang Makassar-Bugis di kedua teks tetapi terdapat pula modifikasi dalam novel GP yang intertekstualitasnya cenderung subjektif; dengan munculnya cerita cinta antara seorang pria Makassar dan seorang wanita Portugis. Selain itu, wacana kolonial yang tampak jelas dalam SKT terkesan kabur dengan ilustrasi cerita cinta ini. Yang terakhir adalah adanya transformasi karakter bernama Andi Patunru yang muncul sebagai protagonis di SKT justru tampil sebagai antangonis di GP.
Mengundang Tamu Di Jawa: Struktur Teks, Koteks, dan Konteks Pada Tradisi Lisan Ijeman Di Mertoudan Surakarta
Authors: Hanum Icha Latifa , Winarti Daru
Published: February 2023

Masyarakat Jawa di Desa Mertoudan, Kelurahan Mojosongo, Kecamatan Jebres, Kota Surakarta memiliki tata cara unik untuk mengundang tamu pada helatan kenduri. Mengundang tamu dilakukan secara lisan (ijeman) dan tulisan (uleman). Hari ini uleman lebih sering dipraktikkan lantaran lebih praktis. Ditambah kalangan muda lebih cenderung bergeser ke tata cara baru yang berbasis digital. Selain lebih efisien, undangan digital dianggap lebih relevan kondisi zaman. Kondisi tersebut membuat tradisi lisan ijeman berpotensi punah. Hubungan antara bahasa dan budaya dalam ijeman ditempatkan sebagai pokok bahasa tulisan ini. Di samping sebagai usaha sistematis dalam pemertahanan bahasa, studi ini akan menunjukkan relevansi tradisi lisan dalam dinamika kehidupan kiwari. Artikel ini berfokus pada struktur dan makna ijeman sebagai representasi tradisi lisan masyarakat Jawa. Subtansi pembahasan mengacu pada paradigma antropolinguistik Sibrani melalui tiga parameter, keterhubungan, kebernilaian, sekaligus keberlanjutan. Data penelitian berupa transkrip percakapan tiga informan saat melakukan kegiatan ijeman yang berlangsung pada Desember 2021 di Mertoudan, Surakarta. Data penelitian didukung data sekunder berupa observasi dan wawancara dengan pakar dan praktisi ijeman di kawasan Jebres, Surakarta. Hasil penelitian menunjukkan (1) struktur teks ijeman terdiri dari kata sambutan, pembukaan, isi, dan penutup dan (2) mengandung makna spiritual, makna sosial, fungsi filosofis, fungsi pragmatis, dan nilai etika moral.
Beauty Standard as a Construction of Woman Objectification in Trisha R. Thomas’s Nappily Ever After
Authors: Sayekti Heri Okta , Fitria Sari
Published: February 2023

The study aimed to depict how the beauty standards construct female objectification in Nappily Ever After and to analyze how the main character struggled toward beauty standards in the Nappily Ever After novel. This study is sought with qualitative methods to reveal the novel's issue. This study applied the theory of beauty myth from Naomi Wolf. The result of the study found that the beauty ideal is a woman who has straightened hair, brightening skin, a tall, slim body, and a pointed nose. Those highlighted Venus’s physical appearance which made her seem to be a typical woman and objectified her to conform to beauty standards. The study concluded that Venus internalized the beauty ideal which made her feel restricted by her looks and resulted in body image dissatisfaction. Venus struggled after she cut her hair which made her become an outcast in beauty image, being invisible by men, dismissal, and judged by people.
Learner migration at secondary schools in South Africa: Benefits and challenges
Authors: Neluvhola T.G. , Van Zyl A.E. , Maliwichi L. L.
Published: February 2023

Learner migration, which occurs worldwide, is the voluntary and intentional movement of learners from 1 school to another school of their choice in order to secure better learning opportunities. The study reported on here contributes to the literature on learner migration by focusing on the inequalities caused by racism, benefits and challenges that result from learner migration at selected secondary schools across the 9 provinces of South Africa. Bronfenbrenner's bio-ecological theory was used as the theoretical framework to inform a qualitative research inquiry. A purposeful sample of 9 secondary school principals, 27 secondary school learners who migrated and 27 parents of learners who migrated were drawn from across the 9 provinces. Data were collected through semi-structured individual interviews with principals and focus-group interviews with parents and learners. The findings indicate that learner migration provides benefits to learners and their parents through effective principal leadership; sound discipline; quality school facilities and resources; and improved educational opportunities at the receiving schools. However, learner migration is accompanied by several challenges: principals at receiving schools face added administrative and managerial pressure; parents of learners who migrate encounter added financial burdens; and learners who migrate often face arduous travel to and from the receiving school and, in some cases, an intolerant atmosphere at the receiving schools. It is concluded that learner migration is a complex phenomenon requiring effective holistic management.
Trudności związane z pisaniem biografii wybitnych postaci z kręgów wojskowych
Authors: Olejnik Karol
Published: February 2023

This article analyses problems to deal with when writing biographies of prominent figures from armed forces. Starting with a statement that military sources are very specific and taking into account their relatively unified origin (all are created by the military) and topic (all issues related to armed forces) an essential division should be introduced at the very beginning. Military sources can be divided into (A) peaceful time sources and (B) conflict time sources (armed forces at their active stage during wars, preparations to war, riots, etc.). The article suggests some methods and sources for writing military biographies and also points out the necessity to include the motives guiding particular actions, i.e. why those people chose to act that way though other ways were, or seemed to be, open. The author also emphasises the necessity to employ methods from personality psychology.
„Akademik” – pismo i środowisko (1945–1947). Przyczynek do historii niezależnego ruchu studenckiego po zakończeniu II wojny światowej
Authors: Sikorski Tomasz
Published: February 2023

This article discusses the short history of a group of university students gathered around a Warsaw periodical Akademik, published from 1945 to 1947 as a mouthpiece of Towarzystwo Bratnich Pomocy. The article analyses periodical’s content and provides a general picture of this group. Akademik’s editorial team and its fellows and publicists were members of different youth organisations (including political ones), such as Academic Association of Young Fighters (AZWM „Zycie”), ZNOS, OKSMW “Wici”, Democratic Youth Association (ZMD), Bratnie Pomoce, Academic Section of Former Political Prisoners (Sekcja Akademicka Bylych Wiezniow Politycznych) and Academic Sports Association (AZS). Akademik commented on various topics, such as life at the academia and students’ accommodation, but it also featured polemic articles on ideology and politics. Around a year before the last issue was published a group of students left the editorial team and began to work with Stronnictwo Pracy.
Exchange rate overvaluation and agrarian ground rent transfers in Uruguay: 1955-2019
Authors: BENELLI GABRIEL OYHANTÇABAL
Published: February 2023

ABSTRACT This paper measures with a novel methodology the amount of agrarian ground rent intersectoral transfers in Uruguay and its relative weight in the national amount of surplus value during the period 1955-2019. In order to this, the paper identifies the mechanisms through which ground rent is transferred from landowners to industrial and commercial capitals. The main results show that agrarian ground rent transfers, in particular through exchange rate overvaluation, was a recurring mechanism that has been central for capital accumulation. These transfers complement the surplus value appropriated by individual capitals, however, at the same time, consolidate the rentier nature of Uruguay due to the chronic overvaluation of exchange rate.
Appropriation, beliefs, and inculcation: Some other connections between American Pragmatism and Veblen’s conspicuous consumer
Authors: ALMEIDA FELIPE , LUZ MANUEL RAMON
Published: February 2023

ABSTRACT Thorstein Veblen was a founding father of the original institutional economics. Veblen’s first book, The Theory of the Leisure Class (1899), introduced to economists an interdisciplinary perspective to understand consumers’ decision-making. This perspective relied on the processual nature of instincts, habits, and institutions. Veblen’s ideas on human behavior were not completely original, and it has been widely recognized that some of his insights clearly reference the teachings of the American pragmatic school of philosophy. In light of this, our study offers an interpretation of Veblen’s ideas on consumer behavior through the viewpoints of the main thinkers of the pragmatist school of his time. This study explores some important themes within pragmatism, such as William James’s concept of appropriation, Charles Peirce’s understanding of belief and social impulse, and John Dewey’s ideas on socialization and the inculcation of habits. Based on these references, we seek to generate new insights into Veblen’s perspective on consumers’ decision-making in broader terms and at the same time preserve his main philosophical references.
Gastos sim, progressividade não: os entraves para a redistribuição no Brasil
Authors: CIMINI FERNANDA , ROCHA LAURA
Published: February 2023

RESUMO Este artigo se propõe a investigar a trajetória do debate sobre redistribuição e tributação no Brasil no período pós-redemocratização, identificando fatores potencialmente favoráveis a reformas de caráter progressivo, bem como os obstáculos para sua implementação. Portanto, busca-se compreender, especificamente, a resiliência de um sistema tributário injusto em uma das democracias mais desiguais do mundo. A partir da literatura sobre o tema, propõe-se algumas hipóteses exploratórias que são analisadas de forma preliminar e indireta por meio da identificação de elementos sobre desigualdade e reforma tributária nas plataformas dos governos de Collor a Bolsonaro.
Revisitando o conceito de Desenvolvimento Econômico e a Escola de Pensamento do Desenvolvimentismo na Economia
Authors: MORAES ISAÍAS ALBERTIN DE
Published: February 2023

RESUMO O presente trabalho tem como objetivo revisitar e sistematizar os conceitos de Desenvolvimento Econômico e o de Desenvolvimentismo. A hipótese levantada pela pesquisa é a de que em razão da processualidade histórico-social das Ciências Econômicas, os termos Desenvolvimento Econômico e Desenvolvimentismo podem ser categorizados de forma distinta por opção epistemológica e didática na atualidade. O artigo optou por realizar um estudo bibliográfico. Os procedimentos metodológicos para selecionar as referências foram pesquisa bibliográfica focada nos autores com análise histórica, concreta e indutiva da economia e do fenômeno de desenvolvimento econômico. Os resultados obtidos são de que os termos Desenvolvimento Econômico e Desenvolvimentismo podem ser categorizados de forma distinta, o primeiro como conceito empregado por diversas escolas do pensamento econômico; o segundo é uma Escola de Pensamento Econômico em si e que possui quatro correntes teóricas (Desenvolvimentismo Clássico, Social Desenvolvimentismo, Novo Desenvolvimentismo, Desenvolvimentismo Socialista de Mercado).
DISTAL NEUROTIZATION OF THE ANTERIOR INTEROSSEOUS NERVE TO RECOVER HAND GRASPING
Authors: CHO ÁLVARO BAIK , FERREIRA CARLOS HENRIQUE VIEIRA , FONTANA RENAN MARTINS , MONTANO GARY ALAN ÂNGULO , KIYOHARA LEANDRO YOSHINOBU , SORRENTI LUIZ
Published: February 2023

ABSTRACT Lower trunk lesions are uncommon, representing about 3 to 5% of brachial plexus lesions in adults. One of the functions lost by patients who suffer this type of injury is the flexion of the fingers, with important harming of palmar grip. This series of cases proposes the transfer of a branch of the radial nerve to the anterior interosseous nerve (AIN), presenting a new alternative for the treatment of these lesions with highly satisfactory results. Objective: To demonstrate our strategy, technique, and results in the reinnervation of the AIN in lesions isolated from the lower trunk of the brachial plexus in four cases of high lesion of the median nerve. Method: Prospective cohort study in which four patients underwent neurotizations. The treatment was directed to the recovery of the fingers’ flexors of the hand and the grip. Results: All patients presented reinnervation of the flexor pollicis longus (FPL) and deep flexors of the 2nd, 3rd, and 4th fingers. The deep flexor of the 5th finger also showed reinnervation but with reduced strength (M3/4) comparing to the others (M4+). Conclusion: Despite the limited number of cases in this and other studies, the results are uniformly good, allowing to consider this treatment predictable. Level of Evidence IV, Case Series.
Medidas comportamentais de prevenção à COVID-19 e letramento em saúde
Authors: Sampaio Helena Alves de Carvalho , Vasconcelos Cláudia Machado Coelho Souza de
Published: February 2023

Resumo Introdução A prevenção da infecção pelo coronavírus (SARS-CoV-2) é propagada pela mídia e recomendada pelos órgãos oficiais de saúde pública. Entretanto, há desafios para adoção de medidas comportamentais de prevenção, sendo o letramento em saúde (LS) uma preocupação que deve permear essas ações de comunicação na saúde. Objetivo Discutir o impacto que um baixo LS da população tem na compreensão e adesão às orientações relativas à prevenção da SARS-CoV-2. Método Trata-se de uma reflexão que resgata, na literatura especializada, o conceito e os fundamentos do LS, as principais orientações de prevenção da SARS-CoV-2 e como operacionalizar orientações letradas em saúde. Resultados A literatura aponta que o baixo LS dos indivíduos repercute negativamente no empoderamento e na operacionalização de informações de saúde recebidas. Não adianta a elaboração de ações educativas se a população não entende e/ou não percebe a importância de se adequar a essas propostas. Os fundamentos do LS são apresentados em guias de comunicação oral, escrita e midiática. Há ferramentas e estratégias para melhor compor uma mensagem educativa segundo o LS. Conclusão É recomendável generalizar que a população tem um letramento inadequado, para deixarmos muito claras as mensagens que transmitimos. Isto é possível seguindo os fundamentos do LS.
INFLUENCE OF COMPOUND TRAINING ON PHYSICAL FITNESS IN BADMINTON ATHLETES
Authors: Ding Wenfeng , Wang Jian
Published: February 2023

ABSTRACT Introduction: Currently, compound rapid stretching training has been explored by sports researchers. However, most research focuses on soccer, basketball, volleyball, and other sports that require vertical jump fitness, but little attention is paid to badminton. Objective: Study the influence of compound rapid stretching training on fitness in professional badminton athletes. Methods: By experimental and statistical methods, 16 outstanding college badminton players were randomly divided into composite training and control groups. The sports performance test (T-shaped run) and short-distance mobility test (5-10-5), were evaluated and compared before and after the intervention, adding a specific rapid stretching training protocol to the composite group. Results: Comparatively, the T-run and hexagonal jump tests were significantly improved in the composite group (P<0.01). The time required to complete the 5-10-5 moving test progressed from 3.980s to 3.763s, significantly longer than the control group (P<0.05). Conclusion: 6-week training with rapid stretching was shown to significantly improve the fitness of college badminton athletes. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.
STRENGTH TRAINING EFFECTS ON LOWER LIMB EXPLOSIVE POWER IN ATHLETES
Authors: Yang Kai
Published: February 2023

ABSTRACT Introduction: In track and field events, the force generated by running, jumping, and throwing starts from the lower limbs and is transmitted from bottom to top, forming a complete dynamic chain. Objective: Study the effect of different combined strength training methods on the explosive strength of the lower limbs of track and field athletes. Methods: Twenty members of the track and field team were selected as research subjects and divided into two groups, A and B. Group A performed the maximum resistance training method, and group B performed the submaximal resistance training method and underwent 12 weeks of different combined strength training. Results: After 12 weeks of training, there was a significant difference in the results of the two groups of students in the approach run (male P=0.034, female P=0.021), and the results of experimental group B improved significantly. Conclusion: The maximum resistance training method can most effectively improve the explosive performance of the lower limbs of track and field practitioners. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.
EFFECTS OF FUNCTIONAL TRAINING ON THE ATHLETIC QUALITY OF AEROBICS PRACTITIONERS
Authors: Sang Xiaoyan
Published: February 2023

ABSTRACT Introduction: Athletes’ level of physical fitness has become the basis for achieving their sports ability. The lack of physical fitness can generate a great impasse in the quality of movements and the performance of the athletes. Objective: Study functional training research on aerobics athletes’ athletic quality. Methods: The content of functional training applications in competitive aerobics and fitness was analyzed through a literature review. Research methods of mathematical statistics were used to analyze the collected data and contrast it with the current scientific literature. Volunteers for the research were athletes from the aerobics team at the Institute of Physical Education. They were randomly divided into two groups, the experimental group (n=9) and the control group (n=9). Functional training was added only to the experimental group; all performed the standard training. Results: In the mean total score of the FMS functional movement screening test, the athletes in the experimental group from 9.22 points before the experiment to 15.65 points after the experiment. The control group athletes improved from 9.83 points before the experiment to only 11.23 points after. Conclusion: It was evidenced a dominant improvement in the movement of the athletes who executed the suggested training, acquiring greater coordination gain through functional training. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.
UNSTABLE PLATFORM TRAINING IN TENNIS PLAYERS
Authors: Wang Mingzhe , Yang Ping , Zou Xuejiao , Yu Shibo
Published: February 2023

ABSTRACT Introduction: The constant maintenance of muscular strength is a highly relevant care in training for tennis practice. The unstable platform is developed with the improvement of modern and technological resources, and the need to verify its effects on the athletes’ physical fitness is requested. Objective: Study the effect of unstable platform training on tennis players’ balance ability and assertiveness. Methods: 12 male tennis-practicing students of the Beijing Sports University School of Education 2020 class were randomly selected as research volunteers. Through a literature search, data statistics, and other methods, they were randomly divided into an experimental group and a control group. After 6 weeks of traditional training in the control group and the addition of unstable platform balance training in the experimental group, the results were compared. Results: The ability to stand with eyes open on the dominant leg was significantly improved in the experimental group. After routine training and balance training, the athletes in the experimental group had a great improvement in the assertiveness of passes (P<0.05), and the stability of the service was also improved (P<0.05). Conclusion: After training, all physical abilities were improved. The unstable platform training is a valid resource to improve athletes’ balance and assertiveness ability. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.