bluuebunny/crossref_metadata_2025 huggingface dataset:
ZONACIÓN SÍSMICA EN PROBLEMAS NO REDUCIBLES A UNA DIMENSIÓN.
Authors: Garcìa Jaime , Rosenblueth Emilio
Published: July 2018

Se estudia la zonación sísmica considerando dos criterios de diseño. En el primero, los reglamentos requieren que las estructuras sean diseñadas para coeficientes no menores que ciertos valores que se especifican. La zonación óptima es entonces aquella que minimiza la esperanza del valor presente de los costos iniciales de todas las estructuras que se construirán en la región que se zonifica. En el segundo criterio, se diseña de tal forma que se minimice el valor presente del costo total. Llamaremos a estos criterios zonación para la minimización del costo inicial y total respectivamente. Se muestra que bajo ciertas condiciones, las fronteras coinciden con curvas isoparamétricas y el problema se puede resolvler en una dimensión. Abordamos aquí también los problemas que no pueden reducir a una sola dimensión. Tratamos la microzonación como un caso particular de la zonación. Se propone diferentes métodos para resolver los distintos problemas. El trabajo termina con ejemplos ilustrativos
PROPIEDADES DINÁMICAS DE EDIFICIOS DE LA CUIDAD DE MÉXICO
Authors: Muriá David , González Ricardo
Published: July 2018

En este trabajo se establecen las recomendaciones básicas para identificar las propiedades dinámicas de los edificios a partir de mediciones de vibración ambiental y registros sísmicos, y se comentan las ventajas y limitaciones de estas pruebas. Se presentan las propiedades dinámicas de 60 edificios de la ciudad de México medidas entre 1986 y 1994. Los resultados muestran que los periodos naturales de vibración son sensibles a las características de los suelos y de los sistemas estructurales. Se discuten, para diferentes sistemas estructurales, las relaciones obtenidas del periodo fundamental de vibrar en función del número de niveles, altura del edificio y densidad de muros, y se destaca la gran dispersión de los datos. Finalmente, se señalan las consideraciones de análisis generales que deben asumirse para lograr una modelación matemáticas representativa de las estructuras.
EVALUACIÓN DE UN MÉTODO DE DISEÑO ESTÁTICO PARA EL AISLAMIENTO SÍSMICO DE ESTRUCTURAS DE LA COSTA MEXICANA DEL PACÍFICO
Authors: Tena Arturo
Published: July 2018

El presente trabajo reporta los primero esfuerzos realizados en México con la finalidad de evaluar un método de diseño estático para estructuras aisladas sísmicamente en su base, enfocándose el estudio para el estado de Guerrero, en el Pacífico Mexicano. El método se basa en la recomedaciones del reglamento norteamericano UBC y en el espectro del diseño del reglameto de diseño por sismo del estado de Guerrero. Se concluye que sí se puede utilizar el método del diseño estático para elastómero, siempre y cuando se adecúen algunos criterios propuestos por el UBC y se agreguen algunas restricciones a estructuras de planta alargada (L1/L2>2).
Esboços de uma ética da educação em Sartre
Authors: Santana Marcos Ribeiro
Published: July 2018

O presente texto é uma investigação bibliográfica sobre a obra de Sartre, O Ser e o Nada. Delimita-se o foco em apresentar o projeto sartreano de pensar a condição humana na sua radical, e no mundo. A atenção recai sobre o problema da liberdade que não se caracteriza de forma abstrata, mas que se concretiza na ação dentro de situação existencial e histórica. O objetivo é descrever a possibilidade de se pensar, a partir da compreensão sobre a condição humana, o esboço de uma ética para educação – entendida como a liberdade de criar-se a si mesmo, de maneira autêntica, enquanto ser no mundo engajado com a própria situação existencial e histórica.
Ensinar e aprender Filosofia num contexto de morte do desejo de filosofar
Authors: Ferreira Wanderley Jose
Published: July 2018

Reflexão sobre as condições constitutivas do desejo de filosofar e a morte da filosofia na sociedade atual, apontando para os limites e possibilidades da própria Filosofia. Procura-se determinar, ainda, as possíveis contribuições da Filosofia para a Educação e de que forma repercute no ensino e no aprendizado da mesma a morte do desejo de filosofar. Conclui-se, procurando-se estabelecer quais as exigências que se colocariam à própria Filosofia para que seu ensino não degenere em mera erudição e repetição idiotizante de conceitos, frases feitas e sistemas.
Ecos da modernidade na lei máxima da Educação Brasileira: uma interlocução com Émile Durkheim
Authors: Gomes Catarina Barbosa Torres
Published: July 2018

O principal objetivo deste ensaio é apresentar uma análise sucinta dos reflexos dos argumentos de Durkheim sobre educação no corpo da LDBEN (lei 9394/96). Sua execução foi um desafio, pois sabe-se que Durkheim é o arquiteto de um paradigma clássico para a sociologia e irradia-se alimentando outros paradigmas de teóricos de grande envergadura, que o sucederam. O texto do esboço referencial reflete leituras das obras Educação e Sociologia e Divisão do Trabalho Social, além de comentadores, como Quintaneiro (2002) e Aron (2000).
Homenagem a Carlos Paiva
Authors: Nunes César
Published: July 2018

Homenagem a Carlos Paiva, acadêmico e doutorando do Grupo PAIDEIA, por ocasião de seu falecimento.
A importância do texto filosófico nas aulas de Filosofia
Authors: Santos Katia Cilene
Published: July 2018

Este artigo argumenta em favor do uso de textos extraídos de obras filosóficas originais com alunos de ensino médio. Apesar das críticas que esta proposta tem recebido, e sem ignorar as dificuldades que dela advêm, procura-se mostrar a necessidade de se ter como aspecto central das aulas a leitura e interpretação de fragmentos retirados de obras de filósofos.
Notícia
Authors: Editores Os
Published: July 2018

Agendem-se para o encontro em Donostia/San Sebastian, Pais Vasco, Espanha, de 29 de junho a 01 de julho, que congregará investigadores da SEPHE, Sociedad Española para el Estudio del Património Histórico-Educativo e da RIDPHE, Rede Iberoamericana para a Investigação e a Difusão do Patrimônio Histórico-Educativo.
Arquivo escolar: vivenciar o inusitado
Authors: Menezes Maria Cristina , Pinheiro Maria de Lourdes
Published: July 2018

Com grande satisfação apresentamos a 2ª edição da RIDPHE_R, Revista Iberoamericana do Patrimônio Histórico-Educativo. Neste número se inaugura a seção Dossiê, que traz artigos do México, do Chile e de três diferentes regiões do Brasil, Sul, Sudeste e Nordeste.
Um estudo no arquivo histórico documental do 1º Grupo Escolar de Campinas: rastreando profissões paternas (1928 a 1935)
Authors: Cason Silvia Regina
Published: July 2018

O presente trabalho traz uma análise das profissões e nacionalidade dos pais dos alunos mencionadas nos Livros de Matrículas do 1º Grupo Escolar de Campinas “Francisco Glicério” entre 1928 a 1935. A forma concisa como tais profissões foram registradas nestes livros, fomentaram uma busca por subsídios em estudos já realizados sobre a temática, para elucidarem uma compreensão quanto seus pertencimentos socioeconômicos. Embora lacunar, o que a literatura ofereceu, representou importante recurso de classificação em relação ao pertencimento socioeconômico das famílias desses alunos. Diante disso, dois modos de interpretações foram possíveis. O primeiro mostrou que algumas dessas profissões poderiam ser classificadas como pertencentes a categorias de trabalho dos ferroviários e, por esta razão, foram incluídas na categoria das que geravam melhores condições econômicas. O segundo apontou para o fato de que não poderiam ser assim classificadas, devido à falta de evidências nos registros, indicando, portanto, o oposto: de serem profissões com rendas econômicas mais modestas. Assim, após uma análise geral, que englobou todas as profissões inscritas nos Livros de Matrículas, confrontada com a literatura pesquisada, verificou-se que no Primeiro Grupo Escolar de Campinas “Francisco Glicério”, estavam matriculados filhos de famílias com menores condições econômicas, e também, e em maior número, filhos de famílias com melhores condições econômicas. Legitimando a premissa de que uma clientela heterogênea era acolhida pelos Grupos Escolares.
Dossier: L´école et les maladies dans le monde (XIXe-XXe siècles)
Authors: Parayre Séverine , Martínez Moctezuma Lucia
Published: July 2018

Nous nous intéresserons au corps malade et aux maux du corps, à leurs prises en charge au sein du système éducatif et aux transformations induites dans les conceptions et pratiques scolaires. Au cours des XIXe et XXe siècles, différentes maladies et épidémies ont frappé les sociétés, qui, souvent démunies, ont été amenées à instaurer des stratégies préventives et curatives. Le système éducatif a été sollicité de nombreuses fois par le milieu médical pour répondre aux états d’urgence sanitaire et a dû s’adapter aux conditions et possibilités qui s’offraient à lui. L’Ecole est devenue ainsi au fur et à mesure de son développement, non seulement un lieu à fort risque de propagation des maladies, mais aussi un lieu qui crée des maladies et peut détériorer les corps.
El arte científico de la higiene escolar en México (1882-1950)
Authors: Alcaraz María Guadalupe García , Sandoval Luciano Oropeza
Published: July 2018

En este escrito examinamos la relación entre el discurso médico y la higiene escolar en el marco de la institucionalización de la educación primaria en México. El estudio va de 1882, año en que tiene lugar el Congreso Higiénico Pedagógico, hasta mediados del siglo XX, cuando se crea el Instituto Federal de Capacitación del Magisterio, organismo que incidió fuertemente en la profesionalización de los profesores en México. Analizamos los referentes teóricos que fundamentan los programas de higiene, como la eugenesia, el desarrollo que tuvo la higiene en las escuelas a partir de la creación de la Secretaría de Educación Pública (SEP) en 1921 y las concepciones que autoridades educativas y médicos tenían sobre la insalubridad y el origen de las enfermedades.
Las revistas pedagógicas: una fuente útil para la investigación histórica educativa
Authors: Martínez Moctezuma Lucia
Published: July 2018

En la colección de educación que resguarda la Universidad Autónoma del Estado de Morelos se conserva un buen número de libros de texto, revistas pedagógicas y cuadernos escolares. Algunos de ellos han servido para preparar tesis de grado, ponencias, artículos y capítulos de libros. Los temas que se han abordado han sido varios: la formación del maestro, la enseñanza de las disciplinas escolares, los métodos de lectura, las influencias extranjeras y las representaciones del cuerpo infantil. Se trata de documentos ricos en información pero también en imágenes y fotografías que suponen un reto para el investigador. Es por esto que nos interesa proponer un ejercicio usando las fotografías que se publicaron en el año de 1907 en la revista pedagógica La Enseñanza Normal.
Da glória à ruína dos cinemas de rua na cidade de Joinville-SC: Exortações à patrimonialização assentes na decadência e novos usos
Authors: Kalb Christiane Heloisa , Flores Maria Bernardete Ramos
Published: July 2018

Neste estudo busco descrever alguns fatos entre as décadas de 1950 a 1990 que ligam os cinemas de rua existentes em Joinville, especialmente a concorrência entre o Cine Palácio, Cine Colon e Cine Rex, e a partir disso, analiso os motivos ensejadores da decadência desses cinemas. É importante salientar que os usos que se fazem/fizeram desses espaços urbanos vieram se modificando após a guinada industrial que ocorreu na cidade a partir da década de 1950. Por ora, o que se conclui desse estudo é que houve um período de glória dos cinemas de rua, mas que por diversos motivos, especialmente a decadência tecnológica, levou estes espaços de entretenimento e lazer a ruir. Outro motivador foram os novos usos que se fizeram desses espaços, nem sempre consonantes com o desejo dos usuários.
Arquivos institucionais do acervo do Centro de Memória da Educação da Faculdade de Educação/USP
Authors: Moraes Carmen Sylvia Vidigal
Published: July 2018

Arquivo Institucional João Penteado: A documentação que compõe o Acervo João Penteado do CME/FEUSP foi doada, em 2005, por herdeiros do educador anarquista João de Camargo Penteado (1877-1965). Os documentos cobrem toda a existência da instituição escolar dirigida por Penteado, que vai de 1912 (quando foi fundada por anarquistas com o nome de Escola Moderna Nº 1) a 2002 (quando o Colégio Saldanha Marinho encerrou suas atividades).
The Physicochemical and Microbiological Qualities of Pegagan Duck Meat Preserved with Different Concentrations of Liquid Smoke and Storage Period
Authors: Yosi Fitra , Wahyuni Dyah , Sari Meisji Liana , Sandi Sofia
Published: July 2018

The aim of this research was to investigate the quality of physicochemistry and microbiology of Pegagan duck meat preserved with various concentrations of liquid smoke and storage time. This study used a complete randomized design (CRD) with a 4x2 factorial pattern. The first factor was the concentration of liquid smoke solution consisted of 4 levels, namely 2; 4; 6, and 8% (v/v). The second factor was the storage time which includes 2 levels ie 12 and 24 hours. The replication used was 4 times. The observed variables were physical quality of meat (water holding capacity, cooking loss, and tenderness), chemical quality (moisture content, protein content, and fat content), and microbiological quality (total microbes, pH, acid total, and total phenol). The data were processed by analysis of variance, followed by Duncan's multiple range test (DMRT). The results showed that there was a significant interaction (P<0.05) between liquid smoke concentration and storage time to water holding capacity, cooking loss, tenderness, fat content, total phenol, total microbial, total acid, and pH in Pegagan duck meat but did not show a significant interaction with other variables. It could be concluded that the optimum liquid smoke concentration was 4% and the optimal storage time was 12 hours.
Optimization of the Use of Farm Waste and Water Hyacinth for Earthworm (Lumbricus rubellus) Cultivation Media
Authors: Agustina Ulan Paluti , Prasetya Agus , Pertiwiningrum Ambar
Published: July 2018

This study aimed to determine the effect of water hyacinth addition to farm waste on the number of earthworms, earthworm weight, media shrinkage, vermicompost quality, and the sustainability and sensitivity of earthworm farming. The study was prepared using a completely randomized design with two different factors, the water hyacinth (media without water hyacinth and media with 5% water hyacinth addition) and raw materials from farm waste (chicken and cow manure, and biogas sludge from chicken and cow manure), with three replications for each treatment. The results showed that the addition of water hyacinth to raw materials from farm waste had a very significant effect on the number of earthworms, earthworm weight, media shrinkage, vermicompost quality (except for P2O5 level that had no significant increase). When manure is to be added to the cultivation media, it is recommended to use cow manure, while both types of biogas sludge (from chicken and cow manure) are good for the cultivation of earthworm. Based on the study of sustainability, the use of farm waste and water hyacinth as media to raise earthworm gives a positive value in economic and environmental aspects. Therefore, it has great potential.
Komunikasi Nonverbal dalam Mengembangkan Konsep Diri pada Siswa Taman Kanak-Kanak (TK) Nanggala Surabaya
Authors: Prameswari Aprilia Citra , Rochmaniah Ainur
Published: July 2018

The concept itself was very important in human life because one's understanding about themselves would determine and guide the behavior in various situations. This study aimed to describe nonverbal communication in developing self-concept in Nanggala Surabaya Kindergarten. This type of research was qualitative description. Subjects were teachers, students and parents. Key informant was head of Nanggala Surabaya Kindergarten. Data collection techniques used observation, interviews, and documentation. While the technique of analyzing data used a model of Miles and Huberman through data reduction, data presentation, and conclusion. The results showed that nonverbal communication was done by teacher to students in developing self-concept included six classifications were kinesthetic message, gestural message, proksemik message, artifactual message, paralinguistic message, touches and smells message. While, the concept of self-developed in Nanggala Surabaya Kindergarten was the concept of the physical self, moral-ethical  self-social, and family pride.
Komunikasi Komunitas Skinhead Sidoarjo dalam Proses Pengambilan Keputusan Kelompok
Authors: Ulum Uzlifatul , Sinduwiatmo Kukuh
Published: July 2018

The purpose of this research to expose the communication process skinhead community in Sidoarjo. This group decision making was to achieve destination and develop a community of Sidoarjo to be skinhead better in solidarity between members. This research used descriptive research method and the type of research was qualitative in-depth interview with data analysis process through three phases namely data reduction, the presentation of the data, the withdrawal of the conclusion. The results of this study indicated that members of the community who always did the Sidoarjo skinhead activities with shared together-especially in decision making towards the group. In this community of skinhead Sidoarjo used horizontal communication. The community of skinhead Sidoarjo had no formal structure, they prefer to be considered all the members have the same social status. Decision making groups of skinhead Sidoarjo used deliberation. Although each group in the decision-making process of deliberation, but also ask for opinions from the more senior or elderly women in community skinhead Sidoarjo.
Videotron sebagai Media Informasi Humas Pemerintahan Kabupaten Sidoarjo
Authors: Purnama Ruddy , Hariyanto Didik
Published: July 2018

The purpose of this research is to describe the function of videotron as information media of Sidoarjo local government’s public relations. The method used in this research is descriptive qualitative. Informants in this study is Sidoarjo local government’s public relations and five people of users Jl A Yani Sidoarjo. Data collection techniques used in this study are in-depth interviews (indepth interview), observation, and documentation. Data analysis developed by Miles and Hubberman includes data reduction, data presentation and conclusions. The results of this study indicate that the videotron function that is managed by Sidoarjo local government’s public relations is considered quite effective in assisting the performance and Sidoarjo local government’s public relations role as a communicator to convey all important information related to administration of Sidoarjo Local Government.
THE METHOD OF CALCULATION AND ANALYSIS OF HEAT TRANSFER COEFFICIENT OF BIMETALLIC FINNED TUBES OF AIR COOLING UNITS WITH IRREGULAR EXTERNAL CONTAMINATION
Authors: Dudarev V. V. , Filatаu S. O. , Karlovich T. B.
Published: July 2018

The article focuses on a new method of calculating heat transfer coefficient of bimetallic finned tubes of air coolers taking into account external operational pollution. In contrast to wellknown methods that use the assumption of a uniform distribution of operational contamination layer with a constant thickness over the entire surface of the fins in the present method being introduced it is assumed that the thickness of the pollution layer during long-term operation is changed irregularly. Under such conditions the thickness of the pollution layer at the base of the fins becomes much greater than at the rest of the finned surface. The suggested method is based on a mathematical model developed with the use of the method of electrothermal analogy, whereby the heat flow through the wall of the finned tube is considered as divided into two components, viz. through the annular layer of outside contamination adjacent to the base of the ribs, and through the remaining part of the external ribbed surface covered with a thin layer of pollution. Within the framework of the developed methodology a new method for determining the thermal resistance of the pollution layer, which is based on analytical solution of two dimensional problem of heat conduction in the annular layer has been created. With the use of this technique the influence of the degree of contamination of the intercostal space of the industrially manufactured bimetallic finned tubes on the heat transfer coefficient has been studied taking into account the intensity of heat transfer of air and the properties and composition of the pollutant for industrial manufactured bimetallic finned tubes. It is established that a layer thickness of the pollutant at the base of the ribs has the greatest influence on the heat transfer coefficient. This is due primarily to the change of actual coefficient of the fins. It is demonstrated that the heat conductivity of the external pollutant has a significant impact on the heat transfer coefficient when the heat exchanger functions in the mode of forced convection of air.
MATLAB-SIMULINK BASED INFORMATION SUPPORT FOR DIGITAL OVERCURRENT PROTECTION TEST SETS
Authors: Novash I. V. , Romaniuk F. A. , Rumiantsev Yu. V. , Rumiantsev V. Yu.
Published: July 2018

The implementation of information support for PC-based and hardware-software based sets for digital overcurrent protection devices and their models testing using MatLab-Simulink environment is considered. It is demonstrated that the mathematical modeling of a part of the power system – viz. of the generalized electric power object – could be based on rigid and flexible models. Rigid models implemented on the basis of mathematical description of electrical and magnetic circuits of a power system can be considered as a reference model for the simulation results that have been obtained with the aid of another simulation system to be compared with. It is proposed to implement flexible models for generalized electric power object in the MatLabSimulink environment that includes the SimPowerSystems component library targeted to power system modeling. The features of the parameters calculation of the SimPowerSystems component library blocks that the power system model is formed of are considered. Out of the Simulink standard blocks the models of a wye-connected current transformers were composed as well as the digital overcurrent protection, missing in the component library. A comparison of simulation results of one and the same generalized electric power object implemented in various PC-based software packages was undertaken. The divergence of simulation results did not exceed 3 %; the latter allows us to recommend the MatLab-Simulink environment for information support creation for hardware-software based sets for digital overcurrent protection devices testing. The structure of the hardware-software based set for digital overcurrent protection device testing using the Omicron CMC 356 has been suggested. Time to trip comparison between the real digital protection device МР 801 and the model with the parameters which are exactly match the parameters of the prototype device was carried out using the identical test inputs. The results of the tests demonstrated a close coincidence of results (the divergence of not more than 8 %), that confirms the possibility of using the suggested hardware-software based test set during the development and debugging of new digital relay protection devices.
CIRCUIT-DESIGN SOLUTIONS AND INFORMATION SUPPORT OF CITY ELECTRIC NETWORKS IN THE CONDITIONS OF THE SMART GRID
Authors: Fursanov M. I.
Published: July 2018

The structure, circuit-design solutions and information support of the city electric networks in the conditions of the SMART GRID have been analyzed. It is demonstrated that the new conditions of functioning of electric power engineering, increasing demands for its technological state and reliability in most countries determined the transition to a restructuring of electrical networks to be based on the SMART GRID (intelligent power networks) innovative new structure. The definitions of the SMART GRID, its various attributes and characteristics in most developed countries including Belarus are presented. It is revealed that the existing and future circuit and constructive solutions that can automate the process of managing modes of urban electric networks under the SMART GRID conditions are manifold. At present, the most common in distribution networks are the sources of distributed generation (combustion turbines, wind turbines, photovoltaic installations, mini-hydro, etc.). The patterns and problems of information traceability of a traditional urban networks of the unified energy system of Belarus have been analyzed, and it is demonstrated that in the conditions of the SMART GRID most of the problems of the control mode that are characteristic for traditional distribution networks 6–10 kV and 0.38 kV, lose their relevance. Therefore, the present article presents and features the main directions of development of automatic control modes of the SMART GRID.
THE EFFECTIVENESS OF VALIDATION MEASUREMENTS IN AUTOMATED SYSTEMS OF THE POWER SUPPLY SYSTEMS CONTROL IN ACCORDANCE WITH LIMIT VALUES
Authors: Anishchenko V. A. , Pisaruk T. V.
Published: July 2018

A high level of operational reliability of power supply systems is virtually impossible to provide without operational control of the reliability of the measurement variables (currents, voltages, powers, energies, temperatures, pressures) that characterize the condition of power equipment and technological processes. Reforming the power engineering and its transition to market relations necessitate one to toughen the requirements for the reliability of the measuring information. Inaccurate measurements are a potential source of misdiagnosis of malfunctions of equipment and they cause incorrect operation of emergency control equipment and erroneous actions of operating personnel in the control of technological processes. Operational methods of reliability control that enhance the operational reliability of the measuring information are based on the usage of the semantic value of the measured data, their consistency, process consistency, and consistency of balance. These methods use technological sense of the measured variables and they complement the methods of hardware status monitoring of automated control systems based on digital codes. That improves the overall operational reliability of the transmission, collection and processing of information. The most common semantic method of control is the method of limits (“fork”) that compares the numeric value of the measured variable with the upper and lower boundaries of valid values. The disadvantage of limit values in many cases is its poor resolution, due to the wide range of appearance of results of measurements. This reduces the probability of detection of gross and systematic errors of measurements more than it may be accepted. With this regard, the objective of a reasonable narrowing of the range of valid values of the variables, that uses the theory of statistical decisions, acquires high relevance.
THE STUDY OF THE AUTONOMOUS SYNCHRONOUS GENERATOR MODES
Authors: Safaryan V. S.
Published: July 2018

The importance of the problem of the static stability of the stationary mode of the power system for its operation is extremely high. The investigation of the static stability of the power system is a subject of a number of works, but the problems of static stability of the stationary points of an autonomous synchronous generator are given little attention. The article considers transient and resonant (stationary) modes of the generator under active-inductive and active-capacitive loads. Mathematical model of transients in a natural form and in the coordinate system d, q are plotted. It is discovered that the mathematical model of the transition process of an autonomous synchronous generator is identical to the mathematical model of the transition process of the synchronous machine under three-phase short circuit. Electromagnetic transients of an autonomous synchronous generator are described by a system of linear autonomous differential equations with constant coefficients. However, the equivalent circuit of a generator contains dependent sources. We investigated the stability of stationary motion of an autonomous synchronous generator at a given angular velocity of rotation of the rotor. The condition for the existence and stability of stationary points of an autonomous synchronous generator is derived. The condition for the existence of stationary points of such a generator does not depend on the active load resistance and stator windings, and inductance of the rotor. The determining of stationary points of the generator is reduced to finding roots of a polynomial of the fourth degree. The graphs of electromagnetic torque dependencies on the angular velocity of rotation of the rotor (mechanical characteristics) are plotted. The equivalent circuits, corresponding to the equations of the transition process of an autonomous synchronous generator, are featured as well.
DETERMINING A TYPE OF A DAMAGE IN THE CURRENT PROTECTION OF POWER LINES OF 6–35 KV
Authors: Romaniuk F. A. , Buloichik E. V. , Huryanchyk O. A. , Shevaldin M. A.
Published: July 2018

The methods to identify types of phase-to-phase short circuits that can be used to improve technical excellence by speed-current line protection of distribution networks of 6–35 kV are considered. As a result of the assessment of the appropriateness of their application in current protection, the choice was made in favor of the method based on the control of the relative current unbalance. The influence of contact resistances and load currents of various levels on the magnitude and character of the change of relative unbalance taking into account the errors of measuring transformers of current has been studied with the aid of the method of numerical experiment. It is demonstrated that in a lot of cases of arch short circuits in the loaded power line and in idle mode, the control only asymmetry is insufficient for reliable determination of the type of damage. A better algorithm has been proposed for determining phase-to-phase short circuit based on the control and the analysis of the two relative unbalance currents determined by the current values of the differences of the phase currents of the line. Its serviceability was evaluated. It was found out that in all the modes being considered, the proposed method – when boundary conditions are properly chosen – makes it possible to fix three-phase and two-phase short circuit on the protected line, and in the area of remote redundancy. The dynamic properties of the proposed method are investigated for different modes of the line. It is established that in the worst case, the determining of the damage is provided during the time not exceeding 25 ms.
THEORETICAL STUDIES OF THE LEACHING PROCESS OF THE MUDDING ELEMENT IN THE GRAVEL PACKAGE OF THE WELL FILTER USING THE UNIT FOR REVERSE-REAGENT REGENERATION
Authors: Ivanova I. E. , Ivashechkin V. V. , Veremenyuk V. V.
Published: July 2018

During the operation of water wells, their specific production rate is reduced as a result of mechanical, biological and chemical colmatage. The extraction of the mudding element from the filter is complicated by the fact that the deposits cover not only the well filter, but also gravel package and are not completely removed by the treatment. An installation is proposed for reversereagent regeneration of water wells, consisting of a compressor, hoses and submersible device in the form of a two-chamber pneumatic displacement pump. The advantage of the unit is the absence of a circulating pump in its composition and the possibility of efficient processing of the limited filter interval. The downhole submersible device does not contain moving parts except for two floating check valves. In order to describe the process of dissolution of deposits by the method of reverse-reagent water well regeneration, a system of equations is used: the combined equation of motion and mass conservation and the generalized equation of kinetics. By integrating the kinetics equation, an analytical dependence is obtained to calculate the operating time of the unit for reverse-reagent filter regeneration, followed by the reducing of the specific volume of the colmatizing deposits in the gravel package to a predetermined level. According to the formulas obtained, a computer program was compiled, which allows calculating the number of operating cycles of the device, the duration of cleaning and the degree of removal of the colmatant at each stage of the work. With the aid of the developed computer program, the operation of the unit for reverse-reagent filter regeneration is considered on behalf of a water well using two different reagents: hydrochloric acid and sodium dithionite. The procedure for calculating the amount of reagent needed to restore water well productivity is presented.
The Means to Improve Water Treatment and to Enhance Power Engineering Performance of the Water Source Heat Pump
Authors: Junussova L. R. , Abildinova S. K. , Aliyarova M. B. , Chicherin S. V. , Junussov T. Ja.
Published: July 2018

The subject matter of the paper is related to scientific-and-theoretical basis of power engineering characteristics of heat pump directly depending on the quality of treated water for reliable and uninterrupted operation of heat pump evaporator and compressor. On the basis of experimental data, energy parameters of the heat pump are calculated. The method of the combined technology of the heat pump “water – air” operation is considеred, the efficiency of which is based on the preliminary improvement of the quality of water softened with the use of a membrane ultrafiltration unit. This solution made it possible to reduce the load on the filters and to exclude the use of chemical reagents used in the classical schemes of water heating facilities. In order to improve the operation of the heat pump compressor, a method based on altering the speed of rotation of the shaft by means of electronic microprocessor devices has been proposed. To regulate the compressor performance, a frequency converter with a wide range of alternating current frequency is used. The intervals of alteration of frequency of the alternating current corresponding to energy-efficient values of coefficient of transformation of energy of the heat pump are investigated. The values of the energy conversion coefficient of the heat pump obtained in the course of experiments and determined by calculation are consistent within the experimental errors with the regulation of the compressor performance. The suggested experimental device made it possible to determine the dependence of the main characteristics of the unit of the heat pump unit on the number of revolutions of the compressor and to find out an effective range of its control (50–180 %). The development of advanced technologies for natural water treatment under conditions of increased anthropogenic loads on natural water sources is a priority one among the fundamental and applied research in the field of water treatment.
MATHEMATICAL MODELING OF ELECTRICAL RESISTIVITY OF ESR SLAG
Authors: Ivanova O. S. , Rybak V. N.
Published: July 2018

The mathematical models of the electrical resistivity of ESR slag dependence on their composition and temperature are developed. The calculated models are tested for adequacy and can be used in engineering calculations and computer programs, APCS, simulation models and computer programs that permit quickly and accurately determine the parameters of slag in their composition and temperature, as well as to select the composition of slag for the specified parameters.
DESIGNING OF TURN-OUT CORE BOXES WITH LOOSE SIDES
Authors: Skvortsov V. A. , Skvortsov A. A.
Published: July 2018

Designs of the turn-out core boxes with loose sides are given. Standard designs of elements of the turn-out core boxes with loose sides depending on their sizes are given. Tabular data of the sizes and fasteners of these elements of turn-out core with loose sides according to the existing state standard specifications are provided. Content of the article allows to reduce considerably duration of designing of the turn-out core boxes with loose sides in preparation of new technological processes of cast details production.
DEVELOPMENT EXPERIENCE OF UNIVERSITY SCIENCE IN THE PROVINCE
Authors: Sorokin V. K. , Akimova T. I.
Published: July 2018

The establishment of the University science sector in the province is considered in terms of Center of powder metallurgy in the Gorky Polytechnical Institute (Nizhny Novgorod State Technical University – NNSTU). The participation of scientists of NNSTU on basis of the experience in theoretical and practical research in the field of powder metallurgy derived in the Soviet period is shown in the development and introduction of advanced industry technologies in the region and the country, including the activities in the Vyksa metallurgical plant.
MANUFACTURE AND USE OF SILUMIN WITH GLOBULAR SILICON
Authors: Marukovich E. I. , Stetsenko V. Yu. , Gutev A. P.
Published: July 2018

Methods of production of silumin with globular silicon are developed. The manufacturing of this new antifriction material are organized. The wear resistance and operational life of articles from silumin with globular silicon are on par with or surpass performance of similar articles of antifriction bronze, but the articles of silumin with globular silicon are lighter and three times cheaper than articles from antifriction bronze.
OPTIMIZATION OF TEMPERATURE HARDENING FOR IMPROVING THE HEAT RESISTANCE OF TOOL STEEL 4X5MФ1С IN VARIOUS WORKPIECES Part 1. INFLUENCE OF HEATING TEMPERATURE 1040 °С IN THE OIL HARDENING AND HARDERING ON THE HARDNESS AND STRUCTURE OF FORGINGS AND CASTINGS MADE OF STEEL 4X5MФ1C
Authors: Fedulov V. N.
Published: July 2018

Influence of the oil quenching temperature with the heating 1040 °С near 1 hour of tool steel 4X5МФ1С forgings and castings on the microstructure and the ability to hardening after high temperature tempering at 500–650 °C for 1, 5 hours. It was shown that increase of hardening level in comparison with the required index has not been achieved.
OPTIMIZATION OF DESULFURIZATION OF METALL IN CONVERTER SHOP USING DIFFERENT REAGENTS
Authors: Bogushevsky V. S. , Kalenchuk M. V.
Published: July 2018

The mathematical models for dependency of consumption various materials for the removal of sulfur from the metal in the converter shop are developed. The restrictions and disturbances that affect the cost of the desulfurization process were found.
SYNTHETIC APPROACH TO THE DEVELOPMENT OF TECHNOLOGY FOR MANUFACTURE OF COLD-DEFORMED REINFORCEMENTS IN ACCORDANCE WITH THE REQUIREMENTS OF TECHNICAL REGULATIONS AND MARKET
Authors: Belash V. V.
Published: July 2018

The article represents a synthetic approach to the development of technology for manufacture of cold-deformed reinforcement tailored to the needs of the market, which needs to have cold-worked reinforcement with negative field of tolerance on the linear density.
IMPROVEMENT OF EFFICIENCY OF USE OF LIQUID-GLASS MIXTURES. OVERVIEW INFORMATION. PART 1. MODIFICATION
Authors: Krutilin A. N. , Huminski Yu. Yu. , Rusevitch O. A. , Kulbitskaya L. V.
Published: July 2018

The basic directions of improvement of properties of silicate binders and mixtures on their basis are generalized. Organic and inorganic additives for liquid-glass mixtures and autoclave modification are considered. A huge number of various additives proposed to improve the knockout rate of liquid-glass mixtures is due to the complexity of the processes occurring in the mixtures at high-temperature exposure. In order to obtain the optimal structure, it is necessary to ensure the presence in the silicate solution of colloidal particles of liquid glass and active functional groups of a polymeric modifier capable of interacting with this surface.
ECOCURE BLUE – NEW COLD BOX SYSTEM WITH ULTRA-HIGH EFFICIENCY AND AS LOW AS POSSIBLE EMISSIONS
Authors: Vacelet P. N. , Táborský D.
Published: July 2018

By omitting materials subject to the labeling requirement in part 1 cold-box resin, Düker GmbH from Laufach can achieve an impressive reduction in emissions.

Emission and workplace exposure limit values represent major challenges for foundries, and are becoming increasingly important due to every stricter statutory regulations. In particular, compliance with emission guidelines is essential in safeguarding company sites, and is now of equal significance as technical and economic issues. Modern foundries such as Düker GmbH from Laufachpursue a sustainable corporate policy in which the three pillars of cost-effectiveness, social responsibility and environmental protection are accorded equal importance. Düker’s example shows how the use of the new ECOCURE BLUE technology supports environmental protection and occupational health and safety, while also facilitating efficient, highly productive core production.
STRUCTURAL PHASE STATE AND TRIBOTECHNICAL PROPERTIES OF CASTINGS FROM HIGH-CHROME STEEL 20Cr15Mn3, OBTAINED BY TECHNOLOGY OF PRECISION SOL-GEL CASTING IN CERAMIC FORMS
Authors: Kukareko V. A. , Grigorchik A. N. , Astrashab E. V. , Lushchik P. E.
Published: July 2018

The structure, phase composition and tribotechnical properties of the impeller casting for oil and centrifugal pumps made from high-chromium steel 20Cr15Mn3, obtained by the technology of precise casting, were studied. It was concluded that impeller casting made from high-chromium steel 20Cr15Mn3, obtained by the technology of exact casting of Sol-Gel in ceramic molds, had improved properties and can serve as a replacement for the traditionally used material – cast iron.
STUDY OF THE EFFECT OF MODIFIERS WITH ULTRADISPERSED PARTICLES IN THE COATING OF THE ELECTRODE FOR MANUAL ARC WELDING ON THE TECHNOLOGICAL PARAMETERS IN MANUFACTURE OF THE ELECTRODE
Authors: Urbanovich N. I. , Melnichenko V. V. , Baranovsky K. E. , Rozenberg E. V. , Radchenko A. A. , Ignatovich Z. V.
Published: July 2018

It is established that inclusion of the modifier into the electrode coating allowed to change the grains of the weld metal from 20–60 to 10–30 mm, to change its morphology and to improve the welding-technological properties of the coated electrode. It is shown that the modifying additive introduced into the coating of a welding electrode containing ultrafine particles in an amount of 1% of the weight of the dry charge had not deteriorated the technological parameters during manufacture, and the integral index of the different thickness (Desp) of electrodes with standard and experimental coatings did not add to the accepted value of 0.05. This indicates that the quality of the lubricating mass, its properties, the stability of the mass flow from the spinneret are satisfactory for both batches.
PARAMETRIC AMPLIFICATION OF THE SIGNALS IN THE ELECTROSTATIC GRAVIINERTIAL SENSOR
Authors: Gilavdary I. Z. , Mekid S. N. , Riznookaya N. N.
Published: July 2018

The challenges of designing simple, reliable, and high sensitivity graviinertial sensors are investigated. The sensor comprises a proof mass (PM) and is fixed with the housing by the elastic torsion suspension. PM makes small rotations under the action of gravitational forces or inertial forces.

The distinctive features of the sensor are that the differential electrostatic system provides simultaneous reading of the desired signal and a control the torsional rigidity of suspension. In addition, the PM's rotational angular velocity transforms in the alternating current flowing through the capacitors. The presence of аlternating current (AC) voltage sources allows to get the parametric amplification of AC and significantly to improve the sensitivity of the sensor. In the simplest case, the sensor does not contain any feedback circuits.

As an example, calculations of the micromechanical linear accelerations confirm that the periodic modulation of the coefficient of elastic stiffness of the suspension can significantly increase the sensitivity in the low frequency range, even in the absence of parametric resonance.

Conditions for suppressions of background current participating in the output signal from a parametric pumping due to the asymmetry of the differential circuits are set. The frequency characteristics calculations of the sensor were carried out. It is expected, that the proposed sensor design ensures minimum noise level, which can be achievable in the graviinertial sensors. This design and the constructed theory can serve as a basis for creating a wide range of graviinertial devices operating on a movable base, for example, linear and angular accelerometer, gravity gradiometer, gravimeters, and inclinometers, which can be realized in the hybrid and in the micromechanical versions.
PHYSICAL FIELDS OF CIRCULAR CYLINDRICAL PIEZOCERAMIC RECEIVER IN PRESENCE OF A FLAT ACOUSTIC SOFT SCREEN
Authors: Derepa A. V. , Leiko A. G. , Pozdniakova O. N.
Published: July 2018

System in the form of a circular cylindrical piezoceramic transducer near a flat acoustic screen was analyzed. The aim of the work was to solve the problem of receiving plane sound waves by «cylindrical piezoceramic transducer – flat acoustically soft screen» system.

Considered system was characterized by a violation of the radial symmetry of the radiation load of the transducer while maintaining the radial symmetry of the electric load. At the same time, the energy perceived by the system under consideration is distributed between all modes of oscillation of the transducer, while the conversion of mechanical energy into electric is realized only at zero mole of oscillations.

Special attention was paid to the method of coupled fields in multiply connected domains using the imaging method. The design model of the «transducer–creen» system was formulated taking into account the interaction of acoustic, mechanical and electric fields in the process of energy conversion, the interaction of a cylindrical transducer with a flat screen and the interaction of a converter with elastic media outside and inside it. The physical fields of the system under consideration were determined by following solutions: the wave equation; equations of motion of thin piezoceramic cylindrical shells in displacements; equations of stimulated electrostatics for piezoceramics for given boundary conditions, conditions for coupling fields at interfaces and electrical conditions.

A general conclusion was made concerning solving of an infinite system of linear algebraic equations with respect to the unknown coefficients of the expansion of the fields. As an example of the application of the obtained relations, a calculation was made and an analysis of the dependences of the electric fields of the system under consideration for various parameters of its construction on the direction of arrival on the plane wave system was conducted.