bluuebunny/crossref_metadata_2025 huggingface dataset:
Mental Models Of Groundwater Residence: A Deeper Understanding Of Students’ Preconceptions As A Resource For Teaching And Learning About Groundwater And Aquifers
Authors: Arthurs Leilani A. , Elwonger Justin M.
Published: July 2018

There is a growing need for public understanding about groundwater resources. Knowing what groundwater and aquifers are is fundamental to understanding more complex issues such as groundwater quality and availability.  However, groundwater and related concepts are among the topics that instructors most struggle to teach.  Although constructivist theories suggest that students’ preconceptions or misconceptions can be used as teaching tools, the question about exactly how remains.  A resource perspective on this question states the first step involves understanding students’ preconceptions. To gain a deeper understanding of college students’ pre-instructional mental models about groundwater residence, 215 students enrolled in introductory-level environmental geoscience courses taught at two large US state universities were surveyed.  An open-ended questionnaire asked participants to draw and label a concept sketch.  Follow-up interviews asked participants to elaborate upon their concept sketches.  Eight categories of mental models emerged from the analysis of the collected data. These results were interpreted through the lens of cognitive schema theory, which generated to four patterns of mental models.  These patterns emphasize key aspects of students’ pre-instructional mental models about groundwater residence.  Instructors can use this information to design instructional activities about groundwater and aquifers using a resource perspective.
POVEZANOST MUZIČKOG OBRAZOVANJA I ISKUSTVA SA PORODIČNOM KULTURNO-PEDAGOŠKOM KLIMOM BUDUĆIH VASPITAČA
Authors: Đuragić Nataša , Šimoković Ksenia , Mihić Vladimir
Published: July 2018

Nivo muzičke kulture studenata vaspitačkih škola koji umnogome utiče na njihove kompetencije kao budućih stručnjaka, često je uslovljen postojanjem prethodnog muzičkog obrazovanja, kao i nekim aspektima kulturno-pedagoške klime porodice. U ovom radu prikazani su rezultati istraživanja koje je za cilj imalo da ispita povezanost prethodnog formalnog muzičkog obrazovanja i neformalnog muzičkog iskustva sa nivoom kulturno-pedagoške klime porodice studenata, budućih vaspitača. Pored toga, istraživanje se bavilo i značajem pojedinih sociodemografskih faktora (stručna sprema roditelja i mesto odrastanja studenata) za kulturno-pedagošku klimu porodice i postojanje prethodnog muzičkog obrazovanja i iskustva.

Uzorak istraživanja činilo je 225 studenata druge i treće godine Visoke škole strukovnih studija za obrazovanje vaspitača u Novom Sadu. Istraživanje je rađeno metodom neeksperimentalnog tipa, tehnikom anketiranja i skaliranja, instrumentom konstruisanim za potrebe ovog istraživanja. Rezultati istraživanja su pokazali da postoji korelacija između prethodnog muzičkog obrazovanja i nivoa kulturno-pedagoške klime porodice porekla, kao i da su i obrazovanje roditelja i mesto odrastanja studenata značajni faktori koji doprinose kulturno-pedagoškoj klimi porodice i razvijenosti muzičkog obrazovanja i/ili ranog muzičkog iskustva studenata.

Ovaj podatak otvara prostor za osmišljavanje odgovarajućih programa za povećanje muzičkih kompetencija samih vaspitača, kako bi oni mogli pružiti blagovremenu muzičku stimulaciju deci u predškolskim ustanovama. Na taj način vaspitači bi mogli da utičući na kvalitet muzičkih aktivnosti dece, potencijalno posredno kompenzuju i nisku kulturno-pedagošku klimu porodice dece iz porodica sa nižim socijalnim, ekonomskim i obrazovnim statusom roditelja.
O corpo como rascunho: reflexões sobre o corpo e a aparência na adolescência
Authors: Melo José Pereira de
Published: July 2018

O desenvolvimento de práticas que sejam responsáveis pelo desenvolvimento da beleza acontece em todas as sociedades humanas. Contudo, no momento atual, essas práticas atingem as pessoas de diferentes faixas etárias, inclusive adolescentes. Nesse sentido, o objetivo desse texto foi identificar como os adolescentes têm tratado este tema e, quais são as práticas que eles desenvolvem visando o alcance da beleza.
Publicações acadêmicas brasileiras sobre bullying: o que dizem os estudos acerca do tema?
Authors: Almeida Adriana Mesquita de , Cabral Raquel Larissa , Gonçalves Adriana Gimenes , Prodócimo Elaine
Published: July 2018

O objetivo deste estudo foi investigar as publicações acadêmicas sobre violência escolar, especificamente sobre o fenômeno bullying, em revistas brasileiras da área da educação, em Língua Portuguesa, classificadas no estrato A1 de indexação Qualis - CAPES. Foram obtidas 26 revistas que se enquadravam nos critérios estabelecidos. Foi realizada uma busca no acervo digital dessas 26 revistas utilizando as palavras “violência”, “agressividade”, “agressão” e “bullying” no título, resumo e assunto. Foram excluídos artigos escritos em língua estrangeira, sem resumo disponível e classificados como ensaios, chegando a 297 artigos. Por meio da leitura dos resumos foram selecionados aqueles referentes ao âmbito educacional, identificando os que trataram da temática do bullying, totalizando 14 artigos, que foram lidos na íntegra para a realização de uma análise quali-quantitativa.
Existe um currículo museal ? As teorias curriculares na compreensão da educação em museus
Authors: Martins Luciana Conrado
Published: July 2018

O conceito de currículo é multifacetado e no universo da educação escolar tem um longa trajetória de debates e teorizações. Sua compreensão é alvo de diferentes abordagens teóricas, mais técnicas, trazendo o currículo como prescrição de conteúdos, organização do tempo e espaços da educação, ou abordagens mais críticas, enfatizando as escolhas sociais e políticas na construção curricular. A utilização do conceito de currículo para a compreensão de outros contextos educacionais, como os museus, não é consensual, mas vem sendo cada vez mais explorada. Este artigo tem como objetivo propor uma reflexão sobre a especificidade da educação museal a partir das teorias curriculares, enfatizando seu potencial não só para a compreensão dos elementos que compõem a educação em museus, como para o entendimento das escolhas efetuadas e das tensões existentes na definição dos processos educacionais museais. Para isso, são trazidos autores do campo da educação em museus que utilizam as teorias curriculares, enfatizando os avanços e limites das análises propostas. Como forma de superar os aspectos normativos e prescritivos dessas análises, é proposta a utilização das teorias críticas do currículo, em especial o conceito de dispositivo pedagógico de Basil Bernstein. Utilizando a estrutura teórica estabelecida por esse autor, são elucidados alguns aspectos da constituição e do funcionamento da educação nos museus, entendendo a prática educacional museal como currículo em processo.
Apresentação
Authors: Matos Isla Andrade Pereira de , Vasconcellos Camilo de Mello , Vitorino Artur José Renda
Published: July 2018

Trata-se de texto de apresentação do dossiê temático "Educação em museus: a didática museológica e o caráter educativo dos objetos em contextos patrimoniais".
Escola unitária e princípio educativo em Gramsci: um ensaio de compreensão à luz do Caderno 12
Authors: Sobral Karine Martins , Moraes Betânia Moreira , Jimenez Maria Susana Vasconcelos
Published: July 2018

O artigo explora as categorias Escola Unitária e Princípio Educativo, como base de compreensão da proposta educacional de Gramsci articulada à transição ao socialismo. Explicita que, no Caderno 12, o autor parte da constatação de que o sistema educacional italiano se encontra em crise, a qual se materializaria em uma cisão entre ensino técnico e ensino intelectual. O teórico revolucionário assinala que a referida crise do sistema escolar encontra uma solução na forma de uma escola única, que tem como base o princípio educativo. Gramsci pensa a Escola Unitária para o momento de transição do capitalismo ao socialismo, em que o proletariado tome o poder e instaure um novo sistema educacional.
Sociedade inclusiva: a face aparente do capitalismo em uma nova fase
Authors: Pina Leonardo Docena
Published: July 2018

A partir das formulações de Gramsci sobre ideologia, intelectuais e hegemonia, este trabalho realiza um debate teórico com intelectuais que defendem a inclusão social e a sociedade inclusiva. O texto aborda limitações da inclusão social e situa a difusão desse paradigma como um procedimento que reforça a hegemonia burguesa.
Práxis e educação em Gramsci
Authors: Baptista Maria das Graças de Almeida
Published: July 2018

O presente trabalho tem por objetivo apontar a práxis como condição pedagógica necessária à educação em Gramsci. Nesse sentido e à luz do referencial gramsciano, busca-se analisar algumas das contradições constitutivas do fazer educativo e ressaltar a práxis na superação dessas contradições, situando a Universidade como lócus privilegiado de construção dessa condição pedagógica.
O MST e a reforma intelectual e moral gramsciana
Authors: Militão Maria Socorro Ramos
Published: July 2018

Esse estudo mostra os resultados da tese de doutorado que investiga se o Movimento dos Sem Terra (MST) contribui para a construção da hegemonia dos trabalhadores por meio da promoção de uma reforma intelectual e moral, no Estado de São Paulo, visando construir uma Nuova Civiltà. O norte da pesquisa é dado pela trajetória de luta do MST e o seu significado político, tendo por base a filosofia da práxise os pressupostos teóricos postulados por Antonio Gramsci. Pretende-se observar se o ideário gramsciano encontra-se atuante e em que medida se tornou relevante para a práxis política do MST.
Gramsci e a concepção marxista de escola
Authors: Oliveira Thiago Chagas , Felismino Sandra Cordeiro
Published: July 2018

O artigo tenciona demonstrar que a concepção gramsciana de escola não se reduz ao aparelho escolar convencional, mas engloba um conjunto de organismos do mundo do trabalho potencialmente formativos. Pretende, portanto, oferecer elementos categoriais que permitam recompor o conceito gramsciano de escola no corpo geral da crítica marxista.
Educação, hegemonia e terceiro setor na região metropolitana de Campinas
Authors: Lima Marcos Roberto
Published: July 2018

Esta pesquisa tem por objetivo realizar uma análise de projetos educacionais desenvolvidos por ONGs da RMC, tendo por cenário o período de aplicação das novas diretrizes neoliberais como tentativa de saída do capital para sua crise estrutural, sobressaindo-se a implementação da reestruturação produtiva, privatizações e a política do Estado mínimo, culminando em um processo de (des)sociabilização, cuja crítica das formas de representação, destacando-se a ação estratégica do chamado terceiro setor e sua pedagogia do consenso, aplicadas por este Estado educador, se faz imprescindível.
O processo de (re)orientação teórico-epistemológica do departamento III - FACED/UFBA (2004-2006)
Authors: Miranda Vamberto Ferreira
Published: July 2018

Buscamos analisar de um ponto de vista epistemológico (Habermas) três teses produzidas recentemente pelo Departamento de Educação III - FACED/UFBA que têm como objeto de estudo a capoeira. A metodologia do estudo foi de natureza qualitativa, destacando elementos da racionalidade diferenciada para pesquisa e produção do conhecimento na educação física presente nestas teses. Os resultados apontaram alguns indicadores duma (re) orientação teórico-epistemológica no campo acadêmico da educação física no estado da Bahia, a partir do diálogo com formas de manifestação da cultura corporal dos povos afro-descendentes.
A ciência da motricidade humana e as suas possibilidades metodológicas
Authors: Pereira Ana Maria
Published: July 2018

Este trabalho vinculou-se numa abordagem hermenêutica, analisou os discursos sobre a Ciência da Motricidade Humana, com atenção ao seu método de pesquisa. A Motricidade tem seus pressupostos assentes na fenomenologia, no pensamento complexo e no materialismo histórico dialético. Efetua diálogos com diversas correntes do pensamento científico sugerindo para as pesquisas que decorrem da sua teoria o método integrativo. O método integrativo converge com a idéia de transgressão metodológica, sendo um espaço de aproveitamento de todas as vertentes metodológicas, mas pode revelar incoerência de um dado pressuposto teórico.
El patrimonio Histórico Educativo a través de las fotografías: la historia de la Educación Física en México
Authors: Chávez González Mónica , Macías Eugenia
Published: July 2018

El patrimonio histórico educativo es una perspectiva de análisis que permite proteger y conservar elementos materiales y culturales dentro de los procesos educativos a lo largo del tiempo. Permite reflexionar sobre el valor histórico de los objetos, prácticas y representaciones presentes en el espacio escolar desde un diálogo presente- pasado. También facilita la construcción de una memoria colectiva que refuerza la identidad social. En este texto mostraremos el proceso de montaje de una exposición fotográfica en el campo de la historia de la educación física en México que contribuye al rescate, estudio y difusión de las prácticas y discursos plasmados en la memoria colectiva en el ámbito educativo, y como tal, forma parte del patrimonio histórico educativo.
Um lugar de memória da Young Men’s Christian Association: nos Kautz Family YMCA Archives, os rastros sobre a formação de diretores físicos
Authors: Silva Giovanna Camila
Published: July 2018

O artigo apresenta os Kautz Family YMCA Archives como espaço de preservação da memória da Young Men’s Christian Association e suas potencialidades para pesquisas históricas interessadas em dar visibilidade aos sujeitos, às ideias e às experiências promovidas na e pela YMCA em espaços e tempos sociais diversos. A formação de homens para trabalhar nas diferentes sedes da instituição constituiu-se como ação basilar para que os empreendimentos da Associação lograssem êxito. Destacam-se os cursos de diretores físicos promovidos pela YMCA, investigados a partir da configuração desse campo de atuação, das características desejáveis aos candidatos ao cargo e do processo de preparação em Chicago, nos Estados Unidos.
Sobre o mundo dos e nos arquivos
Authors: Linhales Meily Assbú
Published: July 2018

Há livros que nos enlaçam pelo título e esse foi um deles. Creio que o meu trabalho cotidiano como coordenadora de acervos em um Centro de Memória, tornou tal captura algo mais aguçado. Não menos importante, foi uma nota breve sobre o livro, divulgada pela Profa. Dra. Luciana Quillet Heymann, com quem tive a honra de realizar meu estágio de pós-doutoramento no CPDOC/FGV, entre 2013-2014, investigando processos de organização de Arquivos Pessoais de Professores. Tão logo pude ter o livro em mãos, as expectativas se confirmaram. Trata-se de uma obra indicada a todos que passam boa parte de suas vidas profissionais nos arquivos e na tessitura da escrita da história.
PENGARUH ERA MEDIA BARU DAN TERJADINYA CHAOS IDENTITAS
Authors: Irianingsih Endang Tri , Sudardi Bani , Rais Wakit Abdullah
Published: July 2018

Identitas adalah ciri khas dari seorang individu yang membedakan dengan individu yang lain. Pembentukan identitas dipengaruhi berbagai faktor misalnya  lingkungan. Masa modernisasi saat ini juga turut andil dalam pembentukan identitas ditandai dengan kecanggihan teknologi informasi. Kecanggihan teknologi informasi telah membawa manusia memasuki era media baru dengan menghadirkan smartphone. Namun, dengan hadirnya smartphone telah mempengaruhi pembentukan identitas yang bersifat palsu. Karya tulis ini mengungkapkan seperti apa pengaruh smartphone terhadap pembentukan identitas yang dapat menimbulkan chaos. Permasalahan yang dibahas yaitu (1) apa yang dimaksud dengan chaos identitas? (2) bagaimana pengaruh era media baru pada pembentukan identitas? (3) bagaimana mengantisipasi chaos identitas pada era media baru? Simpulan pada tulisan ini adalah mendeskripsikan dampak adanya era media baru pada jaman smartphone dalam pembentukan identitas maka perlu adanya perhatian khusus untuk menampilkan identas diri yang sesungguhnya. Selain itu identitas yang dibentuk dalam dunia maya dan dunia nyata itu berbeda maka perlu untuk menunjukkan identitas diri agar manusia tidak terjebak dalam dunia simulakra. 
The Effect of Corn Substitution with Palm Kernel Meal Treated by Enzyme on Production Performance and Carcass Quality of Broiler
Authors: Natsir Muhammad Halim , Djunaidi Irfan , Sjofjan Osfar , Suwanto Antonius , Puspitasari Esti , Virginia Ludovika Jessica
Published: July 2018

The research was aimed to evaluate the effects of substitution level of corn with palm kernel meal (PKM) untreated and palm kernel meal (PKM) treated by enzyme on production performance and carcass quality of broilers. The method used in this research was experiment using nested of completely randomized design with 2 factors, the main factor was type of palm kernel meal factors consisting of PKM without enzyme (B1) and PKM by mannanase enzyme (B2), and substitution corn level L0 (without substitution), L1 (12.5%), L2 (25%), L3 (37.5%) and L4 (50%). The different among the treatments were tested by Duncan’s multiple range test. The results showed that corn substitution with PKM untreated and PKM treated by enzymes was significantly effect (P<0.01) on feed conversion ratio (FCR), tenderness, meat cholesterol of broilers and income over feed cost (IOFC) and significant effect (P<0.05) on feed intake, but there is no significant difference on body weight, percentages of abdominal fat and water holding capacity (WHC). Furthermore, effect of level corn substitition with PKM nested to PKM untreated and PKM treated by enzyme was significantly effect (P<0.01) on feed intake, body weight, FCR, and tenderness and significant effect (P<0.05) on IOFC, but there is no effect on percentages of abdominal fat, WHC and meat cholesterol. It can be concluded that the corn substitution with PKM treated by enzymes was better than the PKM untreated on production performance and carcass quality of broilers. The optimal level of PKM untreated as corn substitution was 12.5%. While replacement with PKM treated by enzyme can be used up to 25%.
The Utilization of Different Protein Sources as Soybean Meal Substitution in the Flushing Diet on Reproductive Performances of Doeling
Authors: Putri Aidismen Yulia Dwi , Asturi Dewi Apri
Published: July 2018

This research aimed to evaluate the effect of different protein sources (plant or animal source) as substitution of 50% soybean meal protein in the flushing diet on early reproduction performances of doeling. The treatments were three types of flushing diet, i.e., Control diet containing soybean meal (C), diet containing Indigofera meal (IM), and diet containing cricket meal (CM). Diet IM and CM were substitution of 50% soybean meal protein in the ration. Completely randomized design was used with three treatments and four replications by using twelve Sapera doeling. The experiment with flushing diet was done started from three weeks before mating (including adaptation), during mating and following one month after pregnancy. Parameters measured were nutrient consumption, BCS, plasma glucose, cholesterol, progesterone hormone and reproductive performance. The results showed that treatments of utilization of different protein sources were not significantly affected the feed consumption, BCS and reproductive performances of doeling, but it had significant effect (P<0.05) on plasma glucose and cholesterol. The protein source of Indigofera and cricket meal showed in improving of progesterone status to support until 30 days pregnancy. Diet containing cricket meal could improved onset estrous and duration of estrous. It was concluded that cricket meal can be used as an alternative protein source to substitute of 50% soybean meal protein in the Sapera doeling flushing diet and it can improve the reproductive performances.
Pergeseran Identitas Budaya Komunitas Supporter Surabaya di Instagram
Authors: Tutiasri Ririn Puspita , Kusuma Ade
Published: July 2018

Bonek is called to support the football team Persebaya Surabaya. Bonek image could not be separated from the abbreviation of the word itself, namely "bondo nekat" or dare to do anything to support the team despite not having capital (material). This research explained the shift of group identity shown by Bonek Kampus community through instagram @bonekcampus27 account. The object of this research was text image or writing in the form of caption, which is posted in account @bonekcampus27. Data analyzed Roland Barthes semiotics. The results showed that the figure of Bonek as a supporter of football club Persebaya Surabaya had a different image or stereotype with other supporters. Bonek was no longer labeled with a frightening appearance or behavior that threatens the safety and security of society, but shifts to bonek as a supporter who sincerely supports the success and progress of the team Persebaya Surabaya, had ethics and uphold sports values.
ON A NEW TECHNOLOGY OF PREPARATION OF HOT DRINKING WATER
Authors: Jalilov M. F. , Azimova M. M. , Jalilova A. M.
Published: July 2018

The present article contains information concerning the new Cl-anionization technology in the preparation of hot drinking water. In contrast with water softening, that replaces all the hardness salts by sodium cations in the cation exchanger, this new technology makes it possible to replace incrustating HCO3̄ and SO42--anions in a strong-base anion exchanger by Cl⁻-ions. As a result, the incrustation on the surfaces of heating hot water heaters is prevented. Thus, cations of hardness that are valuable for the human body remain in the water, the quality of the latter conforming to drinking water quality. Considering the important role of calcium and magnesium in the human body, in Germany and Turkey the minimum value of hardness cations in drinking water is limited to 2.85 and 7.50 mg-Eqv/l, respectively. According to the World Health Organization, in the composition of drinking water, the concentration of cations of magnesium and calcium is recommended, respectively, within 10–(20–30), and 20–50 mg/l; the minimum value of total hardness is 2–4 mg-Eqv/l. According to the developed technology drinking water is passed consistently in the downward direction through the mechanical and chlorineanionite exchanger filters. In the latter, the main part of HCO3̄ and SO42--water ions are exchanged for Cl-anions of anionite. Then the water is collected in the tank, from where it is pumped to the hot water heater through the ultraviolet disinfection unit. After the depletion of the anionite by HCO3̄ and SO42--anions, it is regenerated by a solution of 8–12 % NaCl. The results of research by the anion exchangers Purolite A200EMBCl and AB-17-8 are plotted. It is noted that when the specific consumption of salt for regeneration is of about 45–55 kg/m³, working exchange capacity of the A200EMBCl occurs to be in the range 300–370 g-Eqv/m³. For anionization of water, the residual concentration of HCO3̄-ions are changed from 0.5 to 3.2 mg-Eqv/l. The average concentration of these anions occurs to be between 1.8 and 2.2 mg-Eqv/l, when their initial value is 4.4 mg-Eqv/l.
DIAGNOSTIC OF THE INSULATION STATE OF THE ASYNCHRONOUS MOTOR AND THE POWER SUPPLY CABLE UNDER CONDITIONS OF LOCAL COMPENSATION
Authors: Krivonosov V. E.
Published: July 2018

More than 70 % of the load in metallurgy, mining, gas, and other industries of the CIS consist of asynchronous motors. A relevant objective for all enterprises is to reduce consumption of reactive power in the network and ensuring reliable start of the engine by controlling the resistance value of the insulation. The most effective measure for reactive power compensation is placing the capacitor batteries directly at the points of connection of the asynchronous motor i. e. local reactive power compensation. The aim of the present research was to reduce the cost of production of the enterprise (which provides reactive power compensation), and in the period of technological pause to use the power stored in the capacitor to batteries in order control the changes of resistance value of insulation. After disconnecting the motor from the mains and its stop, the windings is being connected in parallel to the capacitor bank. The discharge of the capacitor is performed in the circuit consisting of the inductance of the motor winding, the integrated insulation resistance and battery capacity. Characteristic features of the transitional discharge process of the capacitor depend on the size of the equivalent circuit elements. The transition process may be aperiodic and periodic in its nature. Aging of motor winding causes a decrease of its impedance. When the magnitude of the insulation resistance reaches a critical value, this causes a change of the nature of the process. The device that has been developed monitors the insulation condition of the motor and the power supply cable during technological pauses without the low voltage power source and additional switching.
ASSESSMENT OF THE STATE AND ANALYSIS OF DAMAGEABILITY OF HEATING GRIDS PIPELINES
Authors: Panteley N. V.
Published: July 2018

Heating grids are intended for transportation of thermal energy from heat sources to consumers. On the balance sheet of the power supply organizations of the state enterprise “Belenergo”, which is part of the Ministry of Energy of the Republic of Belarus, there is more than 6500 km of heating grids in one-pipe terms. Analysis of the results of complex surveys of heat supply enterprises in Belarus shows that heating grids are one of the most unreliable elements of the heating system of the city today. The main reason of disturbances in operation of heating grids (about 90 %) is the local external corrosion that manifests itself in the form of fistulas and breaks of metal of network pipelines. The most quickly, all other things being equal, external corrosion affects those pipelines in which there is a direct contact of the unprotected surface of the pipe with the ground. In addition, in the process of operation of heating grids possible damages might happen that are associated with the breakdown of stationary pillars, with the gaps of the buildings cast iron valves, with the breakdown of the thread of the discharge valves, with damage of compensators, etc. According to ORGRES statistical studies, most of the damages (up to 70 %) of pipelines in Russia (as well as in Belarus) are associated with corrosion. Despite the estimated service life of the pipelines (up to 30 years), the sources of centralized heat supply in Russia pipes are 70 % worn out. With this regard, losses significantly increased in heating grids. General wear and tear of the heating grids of Ukraine in 2010 was 70 %, while losses in heating grids reached up to 30 %. Every year, the situation will only get worse. Thus, external corrosion of heating grids is one of the main factors determining reliability of operation of systems of heat supply.
DEVELOPING AND THE ANALYSIS OF MATHEMATICAL MODELS OF GENERATORS OF LINEAR AND RECIPROCATING TYPES WITH ELECTROMAGNETIC EXCITATION
Authors: Menzhinski A. B. , Malashin A. N. , Suhodolov Yu. V.
Published: July 2018

The mathematical modeling of generators of linear and reciprocating types with electromagnetic excitation resulted in obtaining the equivalent electrical circuit and diagrams of magnetic circuit of generators as well as the expressions that describe the electromagnetic processes in generators of linear and reciprocating types with electromagnetic excitation is presented in the article. Mathematical models of generators of linear and reciprocating types with electromagnetic excitation take into account the geometrical parameters of the magnetic system of generators, effect of the armature reaction, the unequal distribution of the magnetic field in the magnetic system of the generators and the dependence of the scattering coefficient and the fringe effect (in linear generators) and buckling (in the reciprocating electric generators) on the coordinates of the movement. An evaluation of the effectiveness of the generators of linear and reciprocating types with electromagnetic excitation was performed that demonstrated that the efficiency of the reciprocating generator with electromagnetic excitation is limited to the amount of movement of the moving part of the generator that can be considered as a drawback of this type of generators. Therefore, the reciprocating generator with electromagnetic excitation is more effective to be used in a small value of the working stroke of the movable part of it or in conjunction with a linear generator as a compensator of the end effect in reciprocating motion. In the linear generator the rate of change of inductance and mutual inductance throughout the movement of the moving part is practically constant. So if an increase of the magnitude of the working stroke of the movable part takes place the benefits of the linear generator are undeniable. However, it should be noted that a reduction of the stroke magnitude of the movable part of the linear generator is limited by constructional dimensions of the magnetic system of the generator, which reduces its efficiency at low value of the working stroke of the movable part.
SOME “EXOTIC” INFORMATION SOURCES THAT HAVE BEEN DISCOVERED DURING THE SELECTION OF SERIAL PUBLICATIONS TO SUPPORT RESEARCH IN ENERGY SECURITY, ENERGY CONSERVATION AND ENERGY EFFICIENCY TECHNOLOGIES AND TECHNIQUES: ADVANTAGEOUS ADDITION FOR “PROFESSIONAL READING” OF A POWER ENGINEERING EXPERT
Authors: Lazarev V. S. , Yurik I. V.
Published: July 2018

This work is a fragment of ongoing research aimed at creating a comfortable information environment that provides access to the publications of international scientific journals and other periodicals and continuing publications that are necessary to support qualitative performance of research in Priority Directions of the Research and Technical Activities in the Republic of Belarus for 2016–2020. During the citation analysis-based selection of the world scientific serial publications apposite for a qualitative performance of research in energy security, energy conservation and energy efficient technologies and techniques with the use of the data of Journal Citation Reports® (which basic results are available at: https://figshare.com/articles/energy_sec_xlsx/5606053/2) a noticeable amount of non-serial items was also found out in addition to serial publications, as well as some publications that, though being serial, did not look typical to be used in the research activities. Individual consideration of each such “exotic” information source confirmed, however, that their noticeable citedness by the world experts in power engineering looked quite natural. Moreover, it becomes clear that these (apparently wrongly) reflected in Journal Citation Reports® information sources are, however, not an “information noise”, but a useful addition to the “professional reading” of power engineering experts. Since these sources are publicly available via the Internet, it was decided just to recommend them for inclusion in the “professional reading” of the CIS power engineering experts, providing the latter with URLs and brief recommendations for the use. All the mentioned data is given in the present article. As for the species structure of the information sources included in our reference list, there are: a database with online access; web-sites of news agencies; web-site of the International Energy Agency; statistical yearbooks and the electronic resources exposing them, annual reports of governmental and intergovernmental organizations; the online version of the newspaper (“The Guardian”).
ACCOUNTING OF INSTRUMENTAL ERRORS IN THE CONTROL OF WINDINGS OF ELECTRICAL MACHINES WITH THE USE OF QUASI-PERIODIC TEST SIGNALS
Authors: Sheinikov A. A. , Suchodolov Yu. V. , Zelenko V. V.
Published: July 2018

The solution of problems of diagnostics of windings of electric machines is associated with the necessity of selection of quasi-periodic test signals against the background noise. In order to highlight useful signals, as a rule, the differences in spectral compositions of signals and noises are used. Ideally, the shape of the optimal filter frequency response should coincide with the shape of the spectrum of the useful signal, which determines the complexity of such a filter. The aim of the research is to increase the accuracy of measurements and simplify the algorithmic support of measuring systems by developing a mathematical tool that makes it possible to uniquely identify and take into account errors caused by the finiteness of the measurement intervals in the processing. Determining a one-to-one relationship between local variations of signal time parameters and alterations in its spectrum parameters is believed to be the reserve of increase of sensitivity of methods of processing of quasi-periodic signals in the conditions of constant growth of computing capabilities of measuring instruments. Variations in the values of the parameters of the signals lead to a violation of the original distribution of the harmonic components, some of the latter being subjected to the greatest alterations changes, and the some other – to the smallest ones. It is proposed to increase the accuracy of measurements due to the replacement the low-sensitivity registration of alterations in the time parameters of signals with the registration of alterations in the parameters of the characteristic harmonic components of the spectrum, which have a maximum sensitivity to deviations of the controlled parameter and a minimum sensitivity to deviations caused by the instability of the measuring equipment. The mathematical tool corresponding to the practice has been developed, that makes it possible to determine unambiguously the errors caused by finiteness of measurement intervals of quasi-periodic signals. Automatic accounting of these errors makes it possible to do without complex correlation processing of quasi-periodic signals that require large computing resources (time and speed of data processing, the amount of RAM) and to ensure the accuracy of measurements.
REGULARITIES OF FORMATION OF FLOW OF COOLANT BEHIND THE TVS-KVADRAT MIXING SPACING GRID OF THE PWR-TYPE REACTOR
Authors: Dmitriev S. M. , Doronkov D. V. , Legchanov M. A. , Sorokin V. D. , Khrobostov A. E.
Published: July 2018

Tgratinghis paper presents the results of experimental investigations of the influence of mixing spacer gratings with different types of deflectors on the coolant flow in the TVSKvadrat fuel assembly of the PWR-type reactor. Experimental model of the TVS-Kvadrat of the PWR reactor was made in complete geometric similarity with the full-scale cassettes. Studies were carried out by modeling the flow of coolant in the core with the use of an experimental stand; the latter was an aerodynamic open loop through which air is pumped. To measure the local hydrodynamic characteristics of the coolant flow, special pneumatic sensors were used that were able to measure the full velocity vector at the point by its three components. During the studies of the local fluid dynamics of the coolant, the transverse flow rates were measured; also, the coolant flow rates were measured by cells of the TVS-Kvadrat experimental model. The analysis of the spatial distribution of the projections of the absolute flow velocity made it possible to detail the pattern of the coolant flow behind the mixing spacing gratings with different variants of the deflector design, as well as to choose the deflector of the optimal design. Accumulated data base on the flow of the coolant in the TVS-Kvadrat fuel assembly formed the basis of the engineering justification of the structures of the active zones of PWR reactors. Guidelines for choosing optimal designs mixing spacing grids have been considered by designers of the “Afrikantov OKBM” JSC when they created implementations of the latest TVS-Kvadrat assemblies. The results of experimental studies are used to verify CFD-codes of both foreign and domestic origin, as well as the programs for detailed cell-by-cell calculation of active zones in order to reduce conservatism in the justification of thermal reliability.
INFLUENCE OF THE MACROSTRUCTURE ON SEGREGATION OF THE STEEL INGOT
Authors: Komarov O. S. , Rozenberg O. V. , Urbanovich N. I. , Baranowski K. E.
Published: July 2018

A theoretical analysis of the influence of carbon content in the steel and nature of macrostructure on segregation of impurities in the crystallization process were made. It is shown that increase of carbon content and transgranular macrostructure creation degree of segregation is being increased. A comparison of sulfur segregation in the ingot with equiaxial and transgranular structure was carried out and the theoretical points were confirmed.
NANOSTRUCTURAL PROCESSES OF MELTING AND CASTING OF CAST IRON WITH FLAKY GRAPHITE
Authors: Marukovich E. I. , Stetsenko V. Yu.
Published: July 2018

It is shown that melting and casting of cast iron with flaky graphite are the complex physical and chemical nanostructural processes. The majorrole in these processis played by the centers of crystallization of dendrites of graphite, graphite nanocrystals, the dissolved and adsorbed oxygen. The modifying ligature of FS75 is used to decrease concentration of the adsorbed oxygen and to fusion enrichment by the centers of crystallization of dendrites of graphite.
DETERMINATION OF THE OPTIMAL SPEED OF THE MANDREL IN THE CONTINUOUS REELING MILL USING NUMERICAL SIMULATION
Authors: Bobarikin Yu. L. , Radkin Ya. I.
Published: July 2018

A proper numerical model of expanding process on a three roll continuous reeling mill was created and number of numerical experiments of the process of tubes rolling were performed. Based on the analysis of the stress-strain state of a rough tubes deformation zone, optimal speed rates of the mandrel providing the decrease in mill rolls and deterioration of mandrel which direct influences on the quality of rough tubes were determined.
RECYCLING OF SCRAP AND WASTE OF COPPER AND COPPER ALLOYS IN BELARUS
Authors: Rovin S. L. , Novak L. M. , Fateev A. V.
Published: July 2018

The construction of a new casting and mechanical shop of unitary enterprise «Tsvetmet» in December 2015 has allowed to solve the complex problem of processing and utilization of scrap and wastes of copper and copper alloys in the Republic of Belarus. The technological processes of fire refinement of copper and manufacturing of copper rod from scrap and production of brass rod by hot pressing (extrusion) of the continuously casted round billet have been mastered for the first time in the Republic of Belarus.
INTENSIFICATION OF THE PROCESS OF SEPARATION OF THE BAR ASSORTMENT BY CROSS-SCREW ROLLING
Authors: Sidorenko M. I. , Isaevich L. A. , Ivanickij D. M.
Published: July 2018

Based on the analysis of the known methods of separation of the bar stock into cut-to-length sections, it has been found that the most effective is the process of transverse screw rolling with the preliminary application of a ring-shaped wedge-shaped groove to the bar. In order to reduce its depth, it is proposed during the rolling process to displace the separated part of the material in a plane perpendicular to the axis of the rod by the amount of plastic crushing characteristic for the stamp cutting of the assortment.
THE STOCHASTIC APPROACHES OF PROCESSES’ DESIGN IN VACUUM-PLASMA FORMATION OF NANOSTRUCTURED COATINGS
Authors: Ivanou I. A. , Valeysky D. V. , KasinskI M. K.
Published: July 2018

The calculations of the spatial and energy parameters of a single-component metal plasma flow which is moved in a process gas environment using a numerical algorithm of test particle stochastic method are discussed. The results of the calculations are used for determining of the plasma flow density distribution on the product surface and for the energy loss in the ion flow within vacuum vessel. The compositions of the process gas and ion plasma flow are investigated. A theoretical model of the adsorption layer formation on the surface of the product with the reliance of the various simultaneous events on the condensation surface is offered.
SPECIAL FEATURES OF MAGNETIC PULSE HARDENING PROCESSING OF STEEL CYLINDRICAL PRODUCTS OF VARIABLE CROSS-SECTION
Authors: Alifanov A. V. , Tsionenko D. A. , Miliukova A. M. , Harchanin A. I. , Maleronak V. V.
Published: July 2018

The calculations of the magnetic field induction and the magnetic field intensity were carried out by the Finite Element Method (FEM) with the use of the software FEMM. The cylindrical inductor of the Magnetic-Pulse Installation (MPI) generates the magnetic field near the surface of the cylindrical steel product as of the uniform as well as variable cross section. It is shown that the regions of the products of the complex cross-section located at the minimal distance to the helix inductor are exposed to highest level of hardening. It is necessary to increase the current pulse in the inductor or to use a split inductor with the variable inner diameter repeating the product profile for hardening of the product regions located at large distances from inductor. The side surfaces of protrusions that are perpendicular to the axis of the system are not exposed to hardening due to the low gradient of the energy density of magnetic field near its surface. In the case of close proximity of the protrusions (for distance less than 1 cm), the material on the product surface in the space between protrusions is not exposedto sufficient hardening.
THE IMPACT OF AUSTENITIZATION TEMPERATURE ON A STRUCTURES FORMATION UNDER CONTINUOUS COOLING OF THE CHROMO-MOLYBDENUM STEEL
Authors: Lutsenko V. A. , Golubenko T. N. , Lutsenko O. V. , Glazunova N. A.
Published: July 2018

The impact of the austenite grain growth of chromo-molybdenum steel on the kinetics of structural decomposition under continuous cooling was studied. It is shown that when the grain is enlarged with an increase in the austenitization temperature from 850 till 1050 °C, the stability of the supercooled austenite in the structure of the chromo-molybdenum steel during the decay process by the intermediate and shear mechanism increases, which contributes to a decrease in the critical quenching rate.
EXPERIENCE OF APPLICATION OF A PORTABLE OPTICO – EMISSION SPECTROMETER FOR MONITORING OF CHEMICAL COMPOSITION OF HOT-ROLLED PRODUCTS TO IMPLEMENT THE CUSTOMER’S REQUIREMENTS
Authors: Kazakova E. A. , Birisen T. S.
Published: July 2018

One of requirements of customers in the automotive industry is the guarantee of lack of intermix of various brands of steel in a mill process of manufacture. For ensuring implementation of this requirement, it is necessary to carry out monitoring of chemical composition of each bar just before shipment, after its packing and application of the required marking. An optimal solution of this problem is application of the portable optico-emission spectrometer allowing to carry out tests of samples directly in place of location.
NANOSTRUCTURAL PROCESSES OF MELTING AND MOULDING OF CAST IRON WITH GLOBULAR GRAPHITE
Authors: Marukovich E. I. , Stetsenko V. Yu.
Published: July 2018

It is shown that melting and molding of cast iron with globular graphite are complex physical and chemical nanostructural processes. The major role in these processes is played by the centers of crystallization of dendrites of graphite, graphite nanocrystals, the dissolved and adsorbed oxygen. The role of the modifying ligature of FeSiMg is reduced generally to essential decrease of concentration of the adsorbed oxygen and an enrichment of fusion by the centers of crystallization of graphite dendrites.
CONTROL OF CHEMICAL COMPOSITION OF CASTING BRASS IN INGOTS USED FOR MANUFACTURE OF STOP VALVES
Authors: Pivovarchyk A. A. , Pivovarchyk Е. V.
Published: July 2018

The article presents the results of a research of the chemical composition of brass foundry grade LS, supplied by domestic and foreign producers, as well as the chemical composition of brass lead grade LC4C used for the manufacture of stop valves. The research was made with use of optical emission spectrometers of various models and a scanning microscope. It was established that the pig delivered by the domestic producers corresponds to parameters of chemical composition for the pig’s foundry brand LS, while in the pig supplied by foreign producers there were found disparities of the chemical composition of certain basic elements. The results of the studies showed that the pig supplied by all producers, as well as the melt obtained with its use, contain in its composition such harmful impurities as S, Bi and P in the amount of 0.001%, 0.0017% and 0.0045%, respectively, that can lead to a decrease in the technological properties of products. It has been established that the use of ARL 3460 and OBLF-QSW 750 emission spectrometers and the Tescan VEGA II LMU scanning electron microscope makes it possible to obtain practically identical values of the content of the main elements and impurities in pigs of foundry and brass lead grade LC40C in studies on determining the chemical composition of the materials under study.
BORON. PROPERTIES AND APPLICATION IN NUCLEAR ENERGY
Authors: Palekha V. A. , Getman A. A.
Published: July 2018

Boron is one of the available chemical elements actively influencing the properties of the alloys. The main use of boron is in the alloys of the control rods of nuclear reactors to stop or slow down the fission reaction.
DEVELOPMENT OF DECLARATIONS OF INDUSTRIAL SAFETY OF FOUNDRY AND METALLURGICAL PRODUCTIONS’ OBJECTS. ANALYSIS OF THE RISK OF ACCIDENTS
Authors: Bayrashevskiy V. А.
Published: July 2018

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MANAGEMENT OF THE SLAG AJUSTMENT IN ARC FURNACES
Authors: Korneev S. V. , Trusova I. A.
Published: July 2018

The slag adjustment during steel smelting in arc steelmaking furnaces, the conditions for sponging and the gas load at different amounts of supplied oxygen and the various contents of carbon in the melt were considered. The amount of blown carbon-containing materials in the steelmaking bath is determined.
ECONOMY, ECOLOGY, ORGANIZATION OF FOUNDRY PRODUCTION BY LOST FOAM CASTING
Authors: Shinsky O. I. , Marukovich E. I. , Shalevskaja I. A. , Shinsky V. O. , Klimenko S. I.
Published: July 2018

The process of receipt of castings by Lost Foam Casting Process (LFCP) from the point of view of economic efficiency and possibilities of receipt of the high-fidelity and high quality castings with the forecast properties. Indexes of hazardous substances emissions at LFCP are defined, measures to purify are worked out and ecological safety of process is shown.
REGULATING OF CAST CONSTRUCTIONS PROPERTIES BY INTENSIFYING HEAT EXCHANGE IN MOLD WITH GASIFIED PATTERN
Authors: Shinsky O. I. , Marukovich E. I. , Doroshenko V. S. , Kaluzny P. B.
Published: July 2018

The paper discusses ways to intensify the heat exchange of the casting in the mold of particulate filler. These methods include the supply of refrigerant to the mold, the dynamic and aerodynamic movement of the refractory filler around the casting. The examples of application of these methods to increase the local properties of cast iron cylinder block body are shown. Application of aerodynamic movement of molding material for aluminum castings has allowed to increase their mechanical properties in 1,3–1,6 times.
RECYCLING OF FERROUS METAL SHAVINGS
Authors: Rovin S. L. , Rovin L. E. , Zayac T. M. , Valickaya O. M.
Published: July 2018

The most advanced and universal way of chips recycling of ferrous metals is the technology of direct chips remelting in rotational tilting furnaces (RBF) directly at the enterprises-sources of waste generation. However common practice of iron and steel chips recycling is based on its briquetting and subsequent remelting in traditional furnaces.

For cost reduction when chip briquetting and organization of hot briquetting sections in places of its formation highly efficient equipment – rotational dryer and RBF is proposed. The possibility and effectiveness of developed furnaces for lowand high-temperature chip heating in briquetting lines is proved. Thermal efficiency of such furnaces when dispersed materials heating is much higher than drum or feed-through furnaces. Hot briquetting of shavings reduces the pressing force, which reduces the specific energy consumption. The use of rotary kilns can reduce technological operations and equipment of production sites for the manufacture of briquettes