bluuebunny/crossref_metadata_2025 huggingface dataset:
Papel da extensão rural pública na difusão da cafeicultura orgânica no município de Araponga, Minas Gerais
Authors: Bahiense Douglas Vianna , Dias Regivaldo Moreira
Published: July 2022

A cafeicultura tem se destacado no sistema orgânico de produção na região da Zona da Mata Mineira. Objetiva-se analisar e enfatizar as ações da extensão rural pública no desenvolvimento técnico da cafeicultura orgânica no município de Araponga-MG. O esboço metodológico deste artigo corresponde à utilização dessas ferramentas: pesquisa bibliográfica, documental e qualitativa. Os resultados apontam que a produtividade média anual – período de 2013 a 2019 – é de 20,6 sacas/ha. As principais reivindicações estão baseadas em processos tecnológicos para beneficiamento dos grãos, fitossanitários, de financiamento rural, e de conservação da água e do solo. A respeito de insumos, o mais aplicado na cafeicultura é o fertilizante orgânico oriundo da produção avícola. Conclui-se que o escritório da EMATER-MG de Araponga possui um papel de relevância institucional através do trabalho de extensão rural.
Cyberbullying, mulheres e violência digital: política educacional direcionada ao Ensino Médio em análise
Authors: Velozo Aline Debossan , Casagrande Ana Lara , Santos Alessandra Ferreira dos
Published: July 2022

Apresentamos uma discussão sobre a prática de discriminação via rede/tecnologias digitais, direcionada às mulheres, problematizando a política educacional ligada à temática no Ensino Médio, em um contexto de reestruturação. Comportamentos agressivos são também oriundos da herança da sociedade que oprime os corpos que frustram o padrão estabelecido e são vivenciados nas diferentes etapas da vida das mulheres. Apoiamo-nos em estudos que abordam o fenômeno do cyberbullying e na análise do documento normativo Base Nacional Comum Curricular - Ensino Médio. Os resultados indicam que há referência ao combate das formas de violência no documento, embora persista a carência de políticas educacionais, o que potencializaria o debate com a juventude no escopo da educação brasileira.
Avaliação de Desempenho Individual e o Simave como instrumentos de gestão e regulação em Minas Gerais: implicações para os trabalhadores docentes
Authors: Silveira Elizeth Rezende Martins da , Previtali Fabiane Santana
Published: July 2022

Este recorte de uma pesquisa de doutorado buscou compreender as implicações das políticas de avaliação do trabalho docente, em particular da Avaliação de Desempenho Individual (ADI) e do Sistema Mineiro de Avaliação e Equidade da Educação Pública (Simave), a partir de 2007, 05 anos após a implantação do Choque de Gestão de Aécio Neves, que inaugura a NGP em Minas Gerais no contexto neoliberalista. O estudo utilizou pesquisa documental e levantamento bibliográfico e, a partir dele, infere-se que a gestão do estado de Minas Gerais configurou-se como controladora para a dinâmica escolar e o trabalho de professores(as), gerando problemas na saúde e na subjetividade docente.
Apresentação do Dossiê “Políticas Públicas de Educação em tempos de crise do Capitalismo Global”
Authors: Resende Fernanda Motta de Paula , Torres Julio Cesar , Bianchini Angelo Rodrigo
Published: July 2022

Temos presenciado mudanças nas políticas públicas de educação frente a novos contextos e (re)configurações do Estado brasileiro, os quais incidem nas mais diferentes esferas do tecido social e têm um alcance expressivo no campo da educação escolar. Esse processo se instaura efetivamente a partir dos anos de 1970, tendo como cenário propício para sua consolidação a crise mundial do modelo fordista e do Estado de Bem-Estar Social e, como aliadas, a profunda recessão econômica e a crise fiscal, impondo dificuldades ao Estado em administrar as contradições próprias do movimento do capital. Nesse sentido, a exigência de escolaridade básica, a partir da década de 1990, esteve presente nas proposições de diferentes sujeitos sociais, como os organismos internacionais, governamentais, empresariais e sindicais, movimentos sociais, ancorando-se na perspectiva da escolarização como subsídio para o ingresso dos países em desenvolvimento na economia global. Tais setores, demonstram, por meio de suas propostas, a preocupação com a elevação do nível de escolarização como forma de capacitar a força de trabalho para as mudanças na economia globalizada.
Políticas públicas de educación en tiempos de crisis del capitalismo global
Authors: Resende Fernanda Motta de Paula , Torres Julio Cesar , Bianchini Angelo Rodrigo
Published: July 2022

Judith Naidof aborda en su entrevista temas como su trayectoria relacionada a la producción del conocimiento, la docencia universitaria y a la militancia en espacios colectivos reivindicatorios. También se destaca, la centralidad de su producción actual, que se centra en las discusiones sobre la evaluación, sobre la lógica de la productividad de los investigadores como una de las nuevas formas de colonización académica. En ese sentido, señala las semejanzas entre las políticas universitarias de los países latinoamericanos, banalizados por el concepto de “Ciencia privatizada”, orientado por el modelo neoliberal de la Universidad Pública.
Neoliberalismo e reforma do ensino médio brasileiro: ofensiva à democracia e aprofundamento das desigualdades sociais
Authors: Resende Fernanda Motta de Paula , Galvão Flávia Motta de Paula , Guedes Maria Denise , Bianchini Angelo Rodrigo
Published: July 2022

Este artigo tem como objetivo analisar a Reforma do Ensino Médio, sancionada pelo ex-presidente Michel Temer, em um primeiro momento, por meio da Medida Provisória MP746/16 e ratificada pela Lei nº 13.415/2017. Desse modo, através de pesquisa bibliográfica e documental, propõe uma reflexão sobre as implicações dessa Reforma para a formação escolar em nível de ensino médio para a juventude brasileira. Os resultados da análise apontam para o caráter antidemocrático da Reforma, bem como para a manutenção da desigualdade entre as classes sociais no que se refere ao direito ao acesso à educação pública de qualidade, socialmente referenciada, para todos.
Condições microclimáticas no Parque do Ingá-PR pelos parâmetros de umidade do ar
Authors: Minaki Cíntia , Dubreuil Vincent , Amorim Margarete Cristiane Costa Trindade
Published: July 2022

A complexidade em mensurar a água, nos diferentes estados físicos, apoia-se em instrumentos registradores pouco precisos e em um sistema climático, cuja delimitação é tênue. A exemplo da atmosfera e de sua composição variável, há vários índices para descrever um dos seus elementos, o vapor d’água. Nesta pesquisa objetivou-se estimar a umidade do ar no Parque do Ingá, em Maringá-PR, a partir de dados de umidade relativa obtidos de um registrador de temperatura e umidade inserido dentro do parque, nos intervalos temporais de abril de 2019 a janeiro de 2020 e de junho de 2020 a março de 2021. Buscou-se também verificar por sensoriamento remoto, a quantidade de vapor d’água precipitável sobre a mesma área, no intervalo temporal disponível das imagens MSI/Sentinel 2A. Concluiu-se que o Parque do Ingá possui potencial para ressaltar alguns efeitos benéficos à cidade, considerando-se sobretudo a umidade relativa e a condição de saturação mais rápida do vapor d’água naquele posto de observação. Quanto ao resultado da análise das imagens orbitais concluiu-se que o vapor d’água precipitável no parque foi de 26,298 mm no ano de 2019 e 25,950 mm em 2020, havendo redução nos seis primeiros meses no período de 2019 a 2021. A estimativa de vapor d’água por meio de imagens orbitais corroborou os dados mensurados pelo sensor fixo, e embora não se trate de medidas equivalentes, foi possível observar uma dinâmica de redução da umidade do ar.
Erosividade da Chuva no Município de São Pedro - SP: Análise entre 1960-2020
Authors: Neves Monique , Di Lollo José Augusto
Published: July 2022

No município de São Pedro - SP, a erosão hídrica afeta tanto a área urbana como a rural e acarreta perdas ambientais, sociais e econômicas. Para compreender a dinâmica dos processos erosivos é fundamental conhecer as características do meio físico, entre elas o potencial erosivo das chuvas. Nesse contexto, o objetivo deste trabalho foi caracterizar o potencial erosivo das chuvas no município de São Pedro, localizado na região centro-leste do estado de São Paulo, utilizando dados de chuva mensal para quatro cenários temporais: 1962, 1972, 1988, 2010 e 2020. A análise foi desenvolvida com base na precipitação média anual, Índice de Erosividade (EI30) e Coeficiente de Chuvas (R).  Para representar espacialmente a erosividade foi utilizado o método de interpolação Inverso da Potência da Distância (IPD) em ambiente SIG (ArcGIS). Índices mais elevados foram observados nos anos de 1962 e 1972 e indicam que houve uma redução do potencial erosivo. Os resultados permitiram concluir que no município ocorreram chuvas com médio e alto potencial erosivo e, portanto, considerando sua ação conjunta com outros fatores ambientais e antrópicos, pode favorecer a deflagração e evolução das erosões. Além disso, esses resultados são importantes e podem auxiliar ações de manejo e conservação do solo, bem como a gestão do território, em conformidade com as características do meio físico.
Analysis of multitemporal compositing techniques from regular and non-regular intervals using MODIS daily images in the Amazon region with a high percentage of cloud cover
Authors: Salgado Cristiane Batista , Carvalho Junior Osmar Abílio , Santana Nickolas Castro , Gomes Roberto Arnaldo Trancoso , Guimarães Renato Fontes , Silva Cristiano Rosa
Published: July 2022

One challenge in the study of optical remotely sensed time series in the Amazon is the constant cloud cover. The present study evaluates different compositing techniques using regular and non-regular intervals to obtain cloud-free images over large areas. The study area was the municipality of Capixaba in the State of Acre, belonging to the Amazon region. The tests considered four compositing algorithms (maximum, minimum, mean, and median) for daily MODIS sensor data (b1 and b2, 250m). The compositing technique from regular intervals adopted the following periods: 8, 16, 24, 32, 40, and 48 days. The irregular interval composite images adopted different composition intervals for dry seasons (April to September) and rainy (October to March).  The cloud mask and viewing angle constraint allowed to obtain information without atmospheric interference and closest to nadir view. The composite images using regular intervals did not allow to overcome the high frequency of cloud cover of the region. The composite images from non-regular intervals presented a higher percentage of cloud-free pixels. The mean and median methods provided the better visual appearance of the images, corroborating with the homogeneity test. Therefore, composite images from non-regular intervals may be an appropriate alternative in places with constant cloud coverage.
Educación privada y segregación por nivel socioeconómico en la Provincia de Buenos Aires, Argentina
Authors: Krüger Natalia
Published: July 2022

La segregación por nivel socioeconómico es una de las manifestaciones actuales más relevantes de la desigualdad que experimentan los distintos grupos sociales al interior de los sistemas educativos latinoamericanos. Dado que el fenómeno presenta características específicas en cada contexto, es de interés analizarlo en ámbitos sub-nacionales, donde su estudio es aún escaso. Desde un abordaje cuantitativo, el presente artículo analiza este problema en la educación básica en la Provincia de Buenos Aires, Argentina, con énfasis en la distribución del alumnado entre los sectores de gestión estatal y privada. Para ello, se emplean datos de los operativos nacionales de evaluación educativa Aprender para el nivel secundario (noviembre de 2017) y el nivel primario (octubre de 2018), de carácter censal. Se estiman índices sintéticos de segregación y se comparan diversos indicadores del perfil socioeconómico de la población que asiste a cada sector. Los hallazgos indican que existe un grado importante de segregación en ambos niveles educativos y que la participación del sector privado posee un papel sustancial. La distribución del alumnado entre y dentro de ambas redes escolares resulta desigual, lo cual limita la probabilidad de interactuar en la escuela con pares de otros grupos sociales. Los resultados invitan a replicar el estudio en otros contextos; a reflexionar sobre el impacto del fenómeno en la equidad educativa y social; y a continuar indagando en sus causas y posibles caminos para superarlo.
Comparative Studies of Photochemical and Electrochemical Methods on Mineralization of Picric Acid
Authors: Ingale Sanjay Vishwasrao , Kumar Ratanesh , Wagh Pratap B , Joshi K D
Published: July 2022

The effluents generated from synthesis and processing plant of Picric acid is reported to be carcinogenic and hence needs to be treated to reduce its concentration below safe discharge limit. Present paper deals with studies on mineralization of Picric acid by adopting photochemical and electrochemical processes and the efficacy of the both processes have been explored in details. Crucial process parameters viz. pH, concentration of oxidizer and catalyst for mineralization of Picric acid are optimized. In photochemical method, It is observed that Picric acid is treated to bring down its concentration from 100 ppm to ≤ 1 ppm under Photo-Fenton process  in 2 hrs whereas same treatment carried out under Photo- catalytic process takes only 1 hr. It is also observed that TiO2 xerogel and beads of nano-TiO2 are more efficient compared to that of commercially available TiO2. The TiO2–Polysulfone (PS) beads show less efficiency than TiO2 xerogel. However, the Picric acid oxidation efficiency for TiO2–PS beads is comparable and advantage of TiO2–PS beads is that it can easily be recovered from the treated solution and can be reused in the next experiments.  Electrochemical process is user’s friendly and economical. In case of electrochemical treatments at optimized process parameters under Electro-Fenton reaction picric acid is completely mineralized below its drain discharge limit where as under Electro-peroxide reaction picric acid is mineralized upto 3 ppm within 3 hrs. The treated solution has been characterized by using UV-Visible spectrophotometer, High performance Liquid Chromatography (HPLC) and Total Organic Carbon (TOC) Analyzer. The observed results have been interpreted and reported in the present paper.
Numerical and Experimental Investigation of a Short Recoil Operated Weapon and Impact of Construction Characteristics on its Operation Cycle
Authors: Badurowicz Przemysław , Kupidura Przemysław , Fikus Bartosz
Published: July 2022

Estimation of kinematic and dynamic parameters of weapon mechanisms during operation is one of the crucial elements of design and optimisation. This study presents results of numerical and experimental investigations of a short-recoil-operated weapon action cycle. Theoretical considerations were based on multibody systems and finite element approaches. An experimental stand was adopted to investigate the kinematic characteristics of pistol parts and provide a set of slide displacement and velocity time courses. Comparison of theoretical and experimental data allowed for positive validation of the investigated model. The multibody systems numerical approach ensured a maximum relative discrepancy with experiment of 3.5 per cent for the velocity of recoiled parts, while finite element analysis calculations yielded a value of 12.7 per cent. Finally, parametric analyses were conducted to determine the influence of selected design characteristics on weapon operation. The analyses proved the correctness of the adopted design assumptions.
INVESTIGATION OF THE POSSIBILITIES OF INCREASING THE PROJECTILE VELOCITY UNDER THE CONDITIONS OF ELECTROTHERMAL-CHEMICAL IGNITION TECHNOLOGY AS APPLIED TO A MEDIUM-CALIBER INSTALLATION
Authors:   Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Burkin V.V. , D'yachkovskiy A.S. ,   Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Ishchenko A.N. ,   Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Kasimov V.Z. ,   Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Samorokova N.M. ,   Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Sidorov A.D. ,   Research Institute of Applied Mathematics and Mechanics of Tomsk State University, Stepanov E.Yu. ,   Research Institute of Applied Mathematics and Mechanics of Tomsk State University
Published: July 2022

This paper presents the results of a theoretical study of an unconventional shot scheme using electrothermal-chemical ignition technology in a medium-caliber installation. The law of combustion of propellants has been adapted to the conditions of a shot with the electrothermal-chemical technology of ignition of a propellant charge as applied to a model ballistic machine of medium caliber. The calculated data obtained on a laboratory ballistic smooth-bore installation of small caliber are taken as a basis. Theoretical parametric studies are carried out aimed at determining the capabilities of a shot using the electrothermal-chemical technology of ignition of a combined powder charge in a wide range of input energy at different initial temperatures of the powder charge. The temperature gradient of the muzzle velocity of the projectile at the initial temperatures of the powder charge of –40 and +20 °C without additional energy input has been 4 %. To compensate for it, it is necessary to introduce an additional energy of 60 kJ into the powder charge. The conditions for loading the investigated ballistic installation are determined, which make it possible to achieve a maximum increase in the muzzle velocity of the projectile in comparison with the base shot according to the classical loading scheme using traditional ignitors. The theoretical modernization of the powder charge has been carried out to achieve bigger increase in the muzzle velocity of the projectile.
WAVE EQUATION WITH CUBIC NONLINEARITY AND EXCITATION OF OSCILLATIONS IN THE “MEDIUM–SOURCE” SYSTEM
Authors:   Pavel Sukhoi State Technical University of Gomel, Shablovskii O.N.
Published: July 2022

A new accurate solution of the wave equation with a source depending on the required function– time has been obtained. The source function has a polynomial (third degree) nonlinearity, as well as two complementary additive members, which include the second and third degrees of the required function and an explicit sine dependence on time. The constructed relations describe namely the process of excitation of oscillations in the “medium – nonlinear rheonomic source” system and therefore do not contain, as a special case, the solution of the wave equation with common cubic nonlinearity. Physical interpretation of the results of work is explained by the properties of the effect of the periodic external force on the medium. The solution has been obtained on the plane the “required function–time” and gives analytical expressions of the partial spatial and time derivatives of the required function. This allows to study the rheonomic properties of isolines of the required function: their velocity and the conditions at which this velocity is alternating. An important influence on the isolines behavior is exerted by the slope of the source function in a small neighborhood of the zero value of the required function. Specifically: its sign determines the mode of (subsonic or supersonic) isoline movement, and its module serves as the scale when calculating the non-dimensional frequency of the exciting oscillations. The intervals of low and high frequencies are considered in this work. At every instant, the gradient properties of the required function are characterized by the monotone profile, located in the semi-infinite domain on the plane of the “coordinate – required function”. The conditions are indicated, at which timeperiodic kink-pulsations occur: at separate moments, the source monotone profile transforms into a kink, which corresponds to two equilibrium states of the system. The rheonomic properties of the monotone profiles curvature have been studied: the appearance of points of inflection and rectification points. Two monotone profiles have been considered: the left and the right branches, located in the semi-infinite domains, respectively, to the left and right of the origin of coordinates. These branches move in oscillation, occasionally approaching each other and moving apart. At the moments when the branches adjoin the origin of coordinates, they form an immobile discontinuity, which is either weak or strong depending on whether the branch slopes are respectively either of different sign or of the same sign. It has been revealed that in the course of such oscillation process, a transonic transition is possible in the high frequency interval: the isoline velocity changes from the subsonic value to the supersonic one. A wave type formation has been constructed: the left and the right branches, forming either weak or strong discontinuity, move in time-periodic oscillation along the coordinate axis.
AB INITIO MODELING OF INTERACTIONS OF P, H, C, S WITH GRAIN BOUNDARIES IN α-IRON
Authors:   South Ural State University, Verkhovykh А.V. , Mirzoev А.А. ,   South Ural State University, Dyuryagina N.S. ,   South Ural State University
Published: July 2022

The results of modeling from the first principles of interaction of nonmetallic impurities of interstitial (H, C) and substitutional (P, S) with grain boundaries in α-iron are presented. The modeling has been conducted within the framework of the density functional theory (DFT) by the full-potential linearized augmented plane waves (FP LAPW) method with consideration to the generalized gradient approximation (GGA'96) in the WIEN2k software package. Three grain boundaries of the slope Σ3 (111), Σ5 (210) and Σ5 (310) are studied. The supercells of the tilt grain boundaries using the coincidence site lattice model is constructed. The values of the energy characteristics of various grain boundaries with impurities are influenced by a number of factors, namely, the volume of the Voronoi polyhedron per impurity, magnetic moments, and the symmetry of the surrounding matrix. The results show that symmetric grain boundaries Σ3 (111) and Σ5 (310) are embrittled by phosphorus, hydrogen, and sulfur, while carbon strengthens interatomic bonds at the grain boundary, which coincides with the data available in the work. In the case of an asymmetric grain boundary Σ5 (210), phosphorus and hydrogen weaken bonds at the grain boundary, while sulfur strengthens them. This is primarily explained by the geometry of the surrounding matrix. The magnetic moments at the impurity atoms are very small and, in most cases, are antiparallel to the magnetic moments at the neighboring Fe atoms.
STABILITY OF FACTORIZATION FACTORS OF WIENER–HOPF FACTORIZATION OF MATRIX FUNCTION
Authors:   South Ural State University, Adukova N.V.
Published: July 2022

We consider the Wiener–Hopf factorization of two matrix functions A(t) and B(t) that are quite close in the norm of the Wiener algebra. The aim of this work is to study the question when the factorization factors of A(t), B(t) will be close enough to each other. This problem is of considerable interest in connection with the development of methods for approximate factorization of matrix functions. There are two main obstacles in the study of this problem: the instability of the partial indices of matrix functions and the non-uniqueness of their factorization factors. The problem was previously studied by M.A. Shubin, who showed that the stability of factorization factors takes place only in the case when A(t) and B(t) have the same partial indices. Then there is a factorization B(t) for which the factorization factors are sufficiently close to the factors of A(t). Theorem M.A. Shubin is non-constructive since it is not known when the partial indices of two close matrix functions will be the same, and the method for choosing the required Wiener–Hopf factorization of the matrix function B(t) is not indicated. To overcome these shortcomings, in the present paper we study the problem of normalization of the factorization in the stable case, describe all possible types of normalizations, and prove their stability under a small perturbation A(t). Now it is possible to find a constructive way of choosing the factorization of the perturbed matrix function, which guarantees the stability of the factorization factors.
ASYMPTOTICS OF THE SOLUTION OF THE FIRST BOUNDARY VALUE PROBLEM FOR A SINGULARLY PERTURBED DIFFERENTIAL EQUATION IN PARTIAL DERIVATIVES OF THE SECOND ORDER OF PARABOLIC TYPE
Authors:   Osh State University, Kozhobekov K.G. , Shоorukov A.A. ,   Osh State University, Tursunov D.A. ,   Osh State University
Published: July 2022

The article constructs a complete uniform asymptotic expansion in a small parameter of the solution of the first boundary value problem. The first boundary value problem is posed for a singularly perturbed linear inhomogeneous second-order partial differential equation with two independent variables of parabolic type. The problem is investigated on a rectangle. The peculiarities of the problem are the presence of a small parameter in front of the heat conduction operator, the existence of corner boundary layers at the lower corners of the rectangle. It is required to construct a uniform asymptotic expansion of the solution of the first boundary value problem on a rectangle, with any degree of accuracy, as the small parameter tends to zero. The asymptotic expansion of the solution in terms of a small parameter is constructed by the Vishik–Lyusternik method. When solving the problem, we use: methods of integration of ordinary differential equations, the classical method of a small parameter, the Vishik–Lyusternik boundary function method, and the maximum principle. As usual, the problem is solved in two stages: in the first stage, a formal expansion of the solution of the first boundary value problem is constructed; and in the second stage, the remainder of the resulting expansion is estimated and this proves that the resulting expansion is indeed asymptotic over the entire rectangle. In the first stage, a formal asymptotic solution is sought in the form of a sum of six functions (solutions): an external solution defined on the entire rectangle; boundary layer solution in a small neighborhood of the lower side of the rectangle; two lateral boundary layer solutions in a small neighborhood of the lateral sides of the rectangle and two corner boundary layer solutions in the neighborhood of the lower vertices of the rectangle. All these boundary layer solutions exponentially decrease outside the boundary layers.
INVERSE CONTROL-TYPE PROBLEM OF DETERMINING HIGHEST COEFFICIENT FOR A ONE-DIMENSIONAL PARABOLIC EQUATION
Authors:   Baku State University, Maharramli Sh.I.
Published: July 2022

In this paper, we consider one inverse control-type problem of determining the leading coefficient of a one-dimensional parabolic equation. The problem under consideration is a variational statement of a coefficient inverse problem for a parabolic equation. The sought for coefficient of the parabolic equation depends on the spatial variable. An integral boundary condition is set for the parabolic equation. The desired highest coefficient of the parabolic equation plays role of the control function, which is an element of the Sobolev space. The set of admissible control functions belong to the Sobolev space. The objective functional for the control problem is compiled based on the integral overdetermination condition set in the inverse problem. This condition may be interpreted as tasks of a weighted mean of the solution of the equation under consideration as per time variable. The solution of the boundary value problem for a parabolic equation, for each given control function, is defined as a generalized solution from the Sobolev space. The existence of a solution of the considered inverse control-type problem is proved. An adjoint boundary value problem for the control problem under study is introduced. The Frechet differentiability of the objective functional in a set of admissible control functions is proved. In addition, an auxiliary boundary value problem is introduced; and using the solution of this problem, an expression for the gradient of the objective functional is found. The necessary optimality condition for the admissible control function is obtained.
PROMISING QUANTUM ENGINEERING OF OPTICAL EVEN/ODD SCHRÖDINGER CAT STATES
Authors:   Institute of Physics, Kazan Federal University, Podoshvedov M.S. , Podoshvedov S.A. ,   2 South Ural State University, Alodjants A.P. ,   National Research University for Information Technology, Kulik S.P. ,   М.V. Lomonosov Moscow State University
Published: July 2022

We propose an efficient way to implement new family of continuous variable (CV) states of definite parity. Measurement induced CV states of definite parity states are realized after subtraction of an arbitrary number of photons from the initial single-mode squeezed vacuum (SMSV) state using a photon number resolving (PNR) detector. Optical design requires irreducible number of optical elements for implementation of the CV states of definite parity. The potential of using the CV states in optical quantum information processing can be high. As an example, we show the possibility of using a family of the CV states of definite parity for quantum engineering of optical even/odd Schrödinger cat states (SCSs). In particular, we report the possibility of implementing the CV states of definite parity that approximate even/odd SCSs of amplitude slightly greater than 4 with fidelity prevailing 0,99 after subtraction of 50,51 photons from original SMSV. The success probability being the third key parameter of the optical design, decreases with an increase in the number of photons, but generally remains at an acceptable level for further use in quantum information processing in the case of a small number of subtracted photons.
LINEAR DIFFERENTIAL HOLDING GAME WITH A BREAK
Authors:   Chelyabinsk State University, Anisov V.O.
Published: July 2022

A linear simple motion constraint differential game is considered. This game is considered from the part of the first player, who needs to keep the state of the system in a given convex terminal set throughout the game, despite the possible glitch and control of the second player. A glitch is understood as an instantaneous stop of the first player at a previously unknown point in time; after a certain time he will eliminate the glitch and will continue his motion. The player control vectograms are n-dimensional convex compacts that depend on time. To construct a u-stable bridge, the second method of L.S. Pontryagin is used. This is how a multi-valued mapping is constructed on the basis of the alternating integral of L.S. Pontryagin. After that, it is proved that the constructed mapping is a u-stable bridge for the game under consideration if a number of conditions are satisfied. At the end of the article, a simple example on the plane is considered, where the vectors of the players are circles centered at the origin and with a constant radius, while the radius of the circle of the first player is strictly greater than the second. In this example, a u-stable bridge is built according to the method proposed in the article, and an extremal strategy is found for the first player on the constructed u-stable bridge.
ON ONE MODIFICATION OF NASH EQUILIBRIUM
Authors:   Moscow State University, Zhukovskiy V.I. , Zhukovskaya L.V. ,   Central Economic and Mathematical Institute of the Russian Academy of Sciences, Kudryavtsev K.N. ,   South Ural State University, Romanova V.E. ,   Moscow State University
Published: July 2022

By the end of the last century there were four areas in the mathematical theory of positional differential games: non-coalitional positional differential games, cooperative, hierarchical and, finally, the least-understood coalitional positional differential games. In their turn, coalitional games are divided into games with transferable payoffs (games with side payments when players can split profits in the course of the game) and with non-transferable payoffs (games with side payments when there are no such distributions for this or that reason). The coalitional games with side payments are being extensively explored at the Faculties of Applied Mathematics and Management Processes of St. Petersburg University and the Institute of Mathematics and Information Technologies of Petrozavodsk State University (by Professors L.A. Petrosyan, V.V. Mozalov, E.M. Parilina, A.N. Rettieva and their numerous students). However, side payments are not always present even in economic cooperation; moreover, side payments can be legislated against. We believe that the research of the equilibrium of threats and counter-threats (sanctions and counter-sanctions) in non-coalitional differential games that we have carried out over the last years allows to also cover some aspects of non-transferable payoff coalitional games. The article considers the issues of namely the internal and external stability of coalitions in the class of positional differential games. The coefficient constraints were identified for the mathematical model of a linear-quadratic differential positional game with twin-coalitional structure for six persons where this coalitional structure is internally and externally stable.
ON UNIQUENESS IN THE PROBLEMS OF DETERMINING POINT SOURCES IN MATHEMATICAL MODELS OF HEAT AND MASS TRANSFER
Authors:   Yugra State University, Neustroeva L.V.
Published: July 2022

We consider the problem of determining point sources for mathematical models of heat and mass transfer. The values of a solution (concentrations) at some points lying inside the domain are taken as overdetermination conditions. A second-order parabolic equation is considered, on the right side of which there is a linear combination of the Dirac delta functions δ(x–xi) with coefficients that depend on time and characterize the intensities of sources. Several different problems are considered, including the problem of determining the intensities of sources if their locations are given. In this case, we present the theorem of uniqueness of solutions, the proof of which is based on the Phragmén–Lindelöf theorem. Next, in the model case, we consider the problem of simultaneous determining the intensities of sources and their locations. The conditions on the number of measurements (the ovedetermination conditions) are described which ensure that a solution is uniquely determined. Examples are given to show the accuracy of the results. This problem arises when solving environmental problems, first of all, the problems of determining the sources of pollution in a water basin or atmosphere. The results are important when developing numerical algorithms for solving the problem. In the literature, such problems are solved numerically by reducing the problem to an optimal control problem and minimizing the corresponding objective functional. The examples show that this method is not always correct since the objective functional can have a significant number of minima.
THERMAL CONDUCTIVITY IN A HOMOGENEOUS STRIP WITH A LINEAR CHANGE IN THICKNESS UNDER BOUNDARY CONDITIONS OF THE FIRST KIND
Authors:   Voronezh State Technical University, Ryazhskikh A.V.
Published: July 2022

An accurate analytical solution has been obtained in quadratures of the initial boundary value problem for one-dimensional unsteady-state heat-transfer equation with boundary conditions of the first kind for an endless strip, while one of its boundaries is moving at a constant preset speed decreasing the strip thickness. Preliminarily, through the self-similar change of the spatial variable, the initial system of equations has been reduced to a fixed boundary system, to which the method of partitioning of dependent variables has been applied. The requirement that the coefficients before the firstorder derivative must be equal to zero for the self-similar derivative and separately included function in a modified equation in partial derivative of parabolic type has allowed to determine the general structure of the solution containing an unknown function. This function is presented as a superposition of two potentials, which are proportionally connected using the self-similar derivative, what has made it possible to simplify the modified equation and to apply the classical Fourier sine integral transformation for its solution. The computation results has shown the dynamics of the local temperature profile along the changing strip thickness at a constant speed, while the kinetics of the average integral temperature shows (unlike with the case of absence of boundary movement) the presence of the maximum that shifts with the growth of the ratio of the boundary movement speed to the heat transfer speed by the conductivity to the fixed boundary. This is explained by the intensive heating up of the strip material in the conditions of the decreasing of its thickness; meanwhile, with the increase in the boundary movement speed (or with the use of material with reduced thermal conductivity), it approaches the fixed boundary. By assuming that the strip thickness is a parameter, the problem in the initial wording is solved using the method of the one-sided Laplace integral time transformation. This solution, when using the linear dependence of parameter on time, correlates with the obtained accurate solution, and therefore it can be used for the preliminary evaluation of the required characteristics of a process under consideration.
NEUMANN BOUNDARY CONDITION FOR A NONLOCAL BIHARMONIC EQUATION
Authors:   Khoja Akhmet Yassawi International Kazakh-Turkish University, Turmetov B.Kh. , Karachik V.V. ,   South Ural State University
Published: July 2022

The solvability conditions for a class of boundary value problems for a nonlocal biharmonic equation in the unit ball with the Neumann conditions on the boundary are studied. The nonlocality of the equation is generated by some orthogonal matrix. The presence and uniqueness of a solution to the proposed Neumann boundary condition is examined, and an integral representation of the solution to the Dirichlet problem in terms of the Green's function for the biharmonic equation in the unit ball is obtained. First, some auxiliary statements are established: the Green's function of the Dirichlet problem for the biharmonic equation in the unit ball is given, the representation of the solution to the Dirichlet problem in terms of this Green's function is written, and the values of the integrals of the functions perturbed by the orthogonal matrix are found. Then a theorem for the solution to the auxiliary Dirichlet problem for a nonlocal biharmonic equation in the unit ball is proved. The solution to this problem is written using the Green's function of the Dirichlet problem for the regular biharmonic equation. An example of solving a simple problem for a nonlocal biharmonic equation is given. Next, we formulate a theorem on necessary and sufficient conditions for the solvability of the Neumann boundary condition for a nonlocal biharmonic equation. The main theorem is proved based on two lemmas, with the help of which it is possible to transform the solvability conditions of the Neumann boundary condition to a simpler form. The solution to the Neumann boundary condition is presented through the solution to the auxiliary Dirichlet problem.
MODELING OF CURVED SURFACES IN GAS DYNAMICS PROBLEMS
Authors:   South Ural State University, Zaripova D.D. , Kovalev Yu.M. ,   South Ural State University
Published: July 2022

In this paper, a method for setting initial conditions on the boundary of an arbitrarilyshaped body on a rectangular grid is presented. A spherical volume of compressed gas, formed as a result of an explosion above the Earth’s surface, is chosen as the body under consideration. Since the cells of the computational grid are rectangular and the contour is curvilinear, fractional cells are used to set the conditions on the boundary. The pressure and density inside the sphere are known and distributed uniformly throughout the volume. The parameters on the boundary are proposed to be calculated in proportion to the volume that the body takes in each cell the contour crosses. Such a volume can be found by integrating over the region cut off by the curve from a rectangular grid cell. The algorithm has been tested on a numerical solution to the problem of the gas sphere expansion by the large-particle method. Since the boundary of the sphere is a contact discontinuity, graphs of the position of density isolines in the process of expansion of the sphere are presented. The calculation results have shown that the described mechanism ensures the preservation of the spherical boundary during the calculation process: the deviation from the values corresponding with the circle equation has equaled less than 1 %.
MODELING OF HEATING OF ENERGY MATERIALS
Authors:   South Ural State University, Kovalev Yu.M. , Pomykalov E.V. ,   South Ural State University, Shershneva O.A. ,   South Ural State University
Published: July 2022

An analysis of the known approximations for describing the dependence of the heat capacity at a constant volume of energetic materials (molecular crystals) on the crystal temperature has shown that there are reliable approximations of the dependence of the heat capacity at a constant volume that do not require complex quantum mechanical calculations to determine the frequencies of normal vibrations, both intermolecular and inside the molecule. To obtain the dependence of the thermal part of the internal energy of a molecular crystal, which is responsible for heating the material, it is required to integrate the heat capacity expression at constant volume over temperature. In this work, calculations have been made for the dependence of the thermal part of the internal energy of a molecular crystal in case when it is calculated through the frequencies of normal vibrations, and in case when it is calculated by integrating the heat capacity at a constant volume with respect to temperature using approximation formulas. When solving the spectral problem of determining the frequencies of normal vibrations within the molecule, the PM3 and DFT quantum chemical methods have been used. The paper presents the dependences of the thermal part of the internal energy of molecular crystals on temperature, calculated for different methods of determination, and a comparative analysis, which has shown that the difference has equaled less than 1 %.
PENGARUH MEDIA, PENDIDIKAN GIZI, DAN LINGKUNGAN SEBAGAI PENUNJANG KESADARAN DALAM PEMILIHAN MAKANAN
Authors: Syawitri Wani Asri , Sefrina Linda Riski
Published: July 2022

ABSTRAKLatar belakang: Kekurangan gizi di Indonesia sampai saat ini masih menjadi masalah kesehatan masyarakat baik di tingkat daeha maupun nasional. Salah satu faktor yang dapat meningkatkan status gizi seseorang, yaitu kualitas mutu gizi yang dikonsumsi sehari-hari. Kualitas mutu gizi dapat dipenuhi dengan adanya kesadaran individu dalam pemilihan makanan.Tujuan: Penulisan literature review ini bertujuan untuk mengetahui adanya pengaruh media, pendidikan, dan lingkungan sebagai penunjang kesadaran dalam pemilihan makanan.Metode: Penyusunan menggunakan metode review melalui beberapa artikel dalam jurnal internasional dan jurnal nasional. Penulis juga melibatkan beberapa referensi lainnya.Hasil: Media berpengaruh dalam meningkatkan kesadaran pemilihan makan melalui kegiatan audio dan visual sharing, serta pemutaran video terkait penyajian makanan. Sedangkan pendidikan berpengaruh pada pengetahuan gizi, terutama pengetahuan tentang kualitas mutu gizi yang dikonsumsi sehari-hari. Faktor selanjutnya, lingkungan yang memengaruhi kesadaran pemilihan makanan di antaranya adalah peran tradisi adat, peran keluarga, peran teman sebaya, dan suasana hati individu.Simpulan: Berdasarkan beberapa artikel dalam jurnal yang digunakan sebagai bahan acuan penulisan literature review ini, didapatkan kesimpulan yang menunjukkan bahwa adanya pengaruh dari media, pendidikan, dan lingkungan sebagai penunjang kesadaran dalam pemilihan makanan.
FAKTOR-FAKTOR PRENATAL YANG MEMPENGARUHI STUNTING PADA ANAK USIA 0-2 TAHUN DI WILAYAH ASIA TENGGARA: LITERATURE REVIEW
Authors: Syabania Riri , Yuniar Pravita Ayu , Fahmi Ilmia
Published: July 2022

ABSTRAKLatar Belakang: Stunting merupakan masalah kurang gizi kronis yang diukur dengan indikator TB/U. Anak usia 0-2 tahun termasuk stunting jika memiliki nilai z-score TB/U ≤ -3,0 SD. Pertumbuhan dan perkembangan anak stunting mengalami gangguan karena gizi buruk, infeksi, serta kondisi psikososial yang kurang memadai. Masa prenatal adalah faktor risiko stunting yang berada pada fase awal.Tujuan: Tujuan kajian literatur ini yaitu menganalisis faktor-faktor prenatal yang menyebabkan stuntingMetode: Metode penulisan artikel ini menggunakan literature review. Sumber data yang digunakan merupakan penelitian yang berasal dari wilayah Asia Tenggara dengan subjek anak usia 0-2 tahun. Penelusuran artikel menggunakan database Google Scholar, Pubmed, dan Science Direct. Didapatkan 8 artikel yang sesuai dengan kriteria inklusi.Hasil: Faktor prenatal yang menyebabkan stunting pada anak usia 0-2 tahun adalah tinggi badan ibu, Ibu dengan tinggi badan <145 cm memiliki HAZ yang lebih rendah dibandingkan dengan anak yang memiliki Ibu dengan tinggi badan >145 cm. Anemia selama kehamilan meningkatkan risiko 3,23 kali lebih besar anak terkena stunting, keberagaman makanan saat prenatal yang merupakan komponen penting dalam menentukan status gizi anak, maternal depression melipatgandakan resiko memiliki anak stunting, kunjungan ke fasilitas kesehatan selama kehamilan juga menjadi faktor penyebab stunting. Fasilitas sanitasi di rumah yang tidak memadai memiliki risiko 40% lebih tinggi terhadap kejadian stunting.Simpulan: Faktor prenatal yang mempengaruhi stunting terdiri dari tinggi badan Ibu, anemia selama kehamilan, keberagamanan makanan saat masa kehamilan, maternal depression, kunjungan health care, dan fasilias sanitasi