bluuebunny/crossref_metadata_2025 huggingface dataset:
O corpo danado
Authors: Rizo Sérgio
Published: September 2016

A representação do corpo humano tem sido um tema central na arte ocidental. Em consonância com esta tradição e desde os seus primórdios, o cristianismo utilizou um sistema de representações com base no corpo humano que enfatizou a relação problemática entre o corpo e a alma. A ambiguidade do corpo cristão dividido entre as forças do bem e do mal, premido entre o Paraíso e Inferno, deu origem a uma vasta produção de representações e metáforas relacionadas ao corpo humano na história das artes visuais e literárias. O foco principal deste artigo é a maneira pela qual os corpos nus dos condenados são representados e relacionados com os corpos demoníacos no tema maior do Juízo Final e da sua categoria dependente, ou seja, a do Inferno. Uma história das representações do corpo nas imagens do Inferno feita a partir de uma concepção teocêntrica e medieval do mundo, que concebeu um corpo miserável  em oposição à alma divina , e que vai ao humanismo contagioso da Renascença, quando as representações do corpo humano no Inferno , às vezes eróticas , eram de fato belas, devido à influência da Antiguidade e aos novos estudos sobre anatomia humana, elaborados pelos seus artistas.
The Proteolytic Activity of Porphyromonas gingivalis Is Critical in a Murine Model of Periodontitis
Authors: Jin Baek Keum , Choi Yun Sik , Kang Cheol Keun , Choi Youngnim
Published: September 2016

Background: Porphyromonas gingivalis (Pg), a periodontal pathogen, has interstrain variability in virulence. The aim of this study is to determine the contribution of the cell invasion ability and proteolytic activity of Pg to its virulence in a murine model of periodontitis.

Methods: Three clinical isolates: KUMC‐P1 (P1: low cell invasion ability and low proteolytic activity); KUMC‐P4 (P4: low cell invasion ability and high proteolytic activity); and KUMC‐P8 (P8: high cell invasion ability and low proteolytic activity), were orally administered into mice. Alveolar bone loss (ABL) and bacterial invasion of gingival tissues were measured. Additionally, effects of the three strains on transepithelial electrical resistance (TER) and the levels of tight‐junction proteins in gingival epithelial cells were evaluated in vitro.

Results: ABL induced by the three strains was in the sequence P4 > P8 > P1, and the difference between P8 and P1 was not significant. Amounts of Pg detected within the gingival tissues were increased by all three strains compared with the sham group, and bacterial level was positively correlated with ABL. In vitro, P4 had a greater effect than the other strains on epithelial barrier disruption, as evidenced by the reduced levels of tight‐junction proteins and TER.

Conclusion: The proteolytic activity of Pg was more critical than the cell invasion ability for inducing experimental periodontitis in mice, which could be attributed to the paracellular pathway dependence of gingival tissue invasion by bacteria in the mice.
Inteligência Competitiva e Ciência da Informação: conexões epistemológicas para tomada de decisão nas organizações
Authors: Pintro Sirlene , Vianna William Barbosa , Varvakis Gregório
Published: September 2016

Este estudo trata do processo de Inteligência Competitiva em organizações e busca identificar suas conexões epistemológicas com a Ciência da Informação, baseado em conceitos teóricos dessa área. Realiza-se estudo exploratório, tendo como metodologia a pesquisa bibliográfica para a elaboração de fundamentação epistemológica, com base nos aportes teóricos da Ciência da Informação. Apresentam-se conceitos de Ciência da Informação presentes na literatura, assim como, os conceitos de Inteligência Competitiva e as fases do ciclo da mesma; e, também, discute-se o processo de tomada de decisão nas organizações. Verifica-se a necessidade de interação com o ambiente externo como fator que abrange a relação entre a Inteligência Competitiva e a Ciência da Informação, considerando-se que a análise desse ambiente permite às organizações a tomada de decisões mais estratégicas para um melhor posicionamento competitivo no mercado. Conclui-se que a Ciência da Informação relaciona-se, epistemologicamente, com a Inteligência Competitiva, principalmente, ao se tratar do processo de tomada de decisão e na interação informacional com os ambientes organizacionais.
A comunicação da ciência em eventos científicos na visão de pesquisadores
Authors: Piumbato Innocentini Hayashi Maria Cristina , Lui Guimarães Vera Aparecida
Published: September 2016

Esse artigo apresenta os resultados obtidos por meio de uma pesquisa empírica sobre o significado que a comunicação científica em eventos assume para uma comunidade de pesquisadores de diferentes áreas da ciência. Do ponto de vista metodológico trata-se de um estudo exploratório e descritivo, de cunho explicativo com abordagem quanti-qualitativa. A população investigada foi composta por 150 pesquisadores vinculados a uma instituição federal de ensino superior do interior do estado de São Paulo, e o instrumento para a coleta de dados foi um questionário online. Os dados empíricos da pesquisa foram categorizados e analisados à luz dos referenciais teóricos da Sociologia da Ciência e da Ciência da Informação. Os resultados evidenciaram especificidades das diferentes áreas do conhecimento em relação à comunicação em eventos científicos confirmando que esse meio de divulgação ainda é um dos mais utilizados pelos pesquisadores, e se constituem em um bom termômetro para verificar a aceitação pelos pares.
Modulação das decisões tributárias do Supremo: Autopoiesis e o argumento econômico no controle de constitucionalidade
Authors: Meneses Clara Marcelle Alves
Published: September 2016

O presente trabalho tem o objetivo de verificar se a Teoria da Autopoiesis contribui para o entendimento da utilização de argumentos orçamentários e econômicos como fundamento da modulação temporal de efeitos das decisões proferidas pelo Supremo Tribunal Federal em controle de constitucionalidade de matéria tributaria. O enfoque buscado utilizará como marco teórico a Teoria dos Sistemas Sociais de Niklas Luhmann, e a pesquisa doutrinária a respeito do art. 27 da Lei 9868/99, especialmente os seus requisitos de segurança jurídica e excepcional interesse social. Conclui-se pela ilegitimidade da utilização isolada de argumentos orçamentários e econômicos para justificar a validade de uma determinada lei tributária ao momento que vai da edição da norma até a eventual declaração de inconstitucionalidade pela Corte Constitucional brasileira, seja essa restrição de efeitos benéfica ao contribuinte ou ao Erário, sob pena de Alopoiesis do Sistema Jurídico.
Etude des relations criblo-vasculaires entre les différents organes de la tige de la vigne (Vitis vinifera L.)
Authors: Fournioux Jean-Claude , Bessis Roger
Published: September 2016

Etude de la structure vasculaire reliant à la tige les feuilles, vrilles, grappes et bourgeons et analyse des relations entre ces organes.

Sur un orthostique les organes de même nature ont au moins une relation entre eux ; vrilles et grappes sont en rapport direct avec feuilles et bourgeons ; il n'y a pas de communication entre feuilles et bourgeons.

D'un orthostique à l'autre, feuilles, vrilles et grappes ne sont en relation que par les faisceaux latéraux foliaires. Les bourgeons des deux orthostiques sont anatomiquement indépendants.

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In this work, the vascular structure which bounds leaves, tendrils, clusters, and shoots and the relation between these organs are studied.

Upon an orthostic, similar organs are interelated one at least. Tendrils and clusters are directly in relation with leaves and buds, there is no relation between leaves and buds.

From an orthostic to one another, leaves, tendrils and clusters are only connected by the side leafly fascicles. Shoots of the two orthostics are anatomically independant.
Influence de l'irrigation sur la composition en glucides solubles, en composés phénoliques et en acides gras des sarments et des rafles au moment de la véraison des raisins et de leur maturité *
Authors: Madero-Tamargo Joaquin , Darné Gérard , Bouard Jacques
Published: September 2016

Dans l'expérimentation réalisée, l'irrigation a entraîné une modification du métabolisme des sarments et des rafles. Dans les sarments, elle a favorisé l'accumulation du saccharose et empêché la dégradation des composés phénoliques. Dans les sarments et les rafles, elle a provoqué une activation de la synthèse des acides gras, sans modifier pour autant le rapport entre les acides gras saturés et insaturés.

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In this work, the influence of irrigation about changes in canes and bunches metabolism is studied. In canes, irrigation increases saccharose storage and inhibits degradation of phenolic compounds. Both in canes and bunches it enhances the synthesis of fatty acids without any modification of saturated and unsaturated fatty acids ratio.

 

* Communication au Symposium International « Ecologie de la Vigne » (25-29 septembre 1978) à Constanza (Roumanie).
L'amiante dans les boissons
Authors: Barbeau C. , Tremblay J. , Gagne M.
Published: September 2016

La détermination du magnésium particulaire est utilisée afin d'étudier la concentration en amiante chrysotile dans les boissons.

II est démontré d'une part que la teneur en magnésium particulaire peut diminuer considérablement par filtration sur plaques contenant de l'amiante et d'autre part que la majorité des boissons alcooliques contiennent peu de fibrilles d'amiante et qu'elles sont moins contaminées que l'eau de consommation.

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The magnesium particle determination is used in order to study the concentration of asbestos (chrysotil) in beverages.

On the one hand, it gives a clear indication that the content of magnesium particle can diminish considerably, using asbestos filtration pads. On the other hand, the majority of alcoholic beverages contains few asbestos fibres and they are less contaminated than drinking water.
Etude écologique des conditions de manifestation de la chlorose ferrique dans le vignoble de la moyenne vallée de la Loire *
Authors: Dupont J. , Morlat René , Salette Jean
Published: September 2016

Dans la région viticole du Val de Loire le potentiel chlorosant des différentes formations géologiques calcaires est très variable. Il apparaît très lié à la quantité de fer extractible à l'oxalate d'ammonium qui est importante sur certains substrats glauconieux. Les conditions de profil pédologique (degré d'évolution de la lixiviation et de l'accumulation de CaCO3) permettent, en relation avec les caractéristiques climatiques, d'expliquer les phénomènes de chlorose ferrique d'année ou de période sèche.

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ln the viticultural region of the Loire Valley the chlorosing potential of the different geological calcareous formations varies greatly. It appears to be closely linked to the quantity of iron extractible with oxalate of ammonium which is important on certain glauconitic substrata. The pedological profile conditions (degree of evolution of lixiviation and accumulation of CaCO3), in relation with the climatic characteristics, allows the phenomena of ferric chlorosis in a year or during a dry period to be explained.

 

* Communication faite au Symposium International d'Ecologie Viticole, Constantza. Roumanie, 27-29 septembre 1978.
Rôle de la « souche de levure » dans la production des substances volatiles au cours de la fermentation du jus de raisin
Authors: Soufleros Evangelos H. , Bertrand Alain
Published: September 2016

L'étude par chromatographie en phase gazeuse des produits volatils formés par 50 souches de levures d'espèces diverses, isolées de la région NAOUSSA (Grèce) a montré que les levures les plus alcoogènes forment le plus de substances, en particulier d'esters, favorables à la qualité du vin.

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Investigation, by gas chromatography, on volatile products formed by 50 various yeast strains isolated in NAOUSSA vineyard (Greece) shows that the most alcohogene strains synthesize these substances, and particularly esters, in a greatest extent, this is favourable to the quality of the wine.
Etude de la composition de vins mousseux pendant la prise de mousse au cours du vieillissement en bouteilles. 1. Etude des acides aminés libres, du glycerol, des sucres et des acides organiques
Authors: Suarez Sébastien , Polo María Carmen , Llaguno C.
Published: September 2016

Dans ce travail, on étudie l'influence sur la composition du vin mousseux élaboré par la méthode champenoise de divers facteurs durée de contact du vin avec la levure, intensification de ce contact grâce à des remuages additionnels, système de clarification utilisé.

Au cours des trois premiers mois après le tirage, l'alcool, le glycérol, les acides L (+) et D (-) lactiques augmentent l'acide malique, la plupart des acides aminés libre diminuent.

Après quinze mois de fermentation en bouteilles, la teneur en acides aminés libres augmente.

Les remuages additionnels, le type de clarification effectués n'ont aucune influence sur la composition du vin.

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In this work, the influence of several factors on the composition of sparkling wine is studied : yeast-wine contact time, by additional bottle-shaking obtained better contact between yeast and two different clarifying systems. The main variations occurring during the secondary fermentation take place in the first three months.

After 15 months of fermentation in the bottle there is a increase in the content of free aminoacids, reaching or surpassing the level of the initial wine at 43 months. The additional shakings or different clarification systems do not have influence on the wine in respect to the studied components.
Aptitudes des clones de différents cépages allemands
Authors: Faas Karl-Heinz , Schöffling Harald , Ley R. , Rouday L.
Published: September 2016

Certains clones de cépages Weißer Riesling, Müller-Thurgau, Grüner Silvaner, Gewürztraminer, Pinot noir et Blauer Frühburgunder sont testés avec un dispositif orthogonal, pendant plusieurs années, en différents lieux de la région viticole du Rhénanie-Palatinat.

Les résultats moyens montrent que les caractéristiques de la production diffèrent fortement suivant le lieu et suivant le clone. Avant tout, c'est le niveau de rendement qui varie fortement d'un clone à l'autre sans que la qualité soit touchée.

Comme la vigne en règle général dure 25 ans, qu'une entreprise viticole doit être rentable d'un point de vue économique, nous demandons à ceux qui conseillent les viticulteurs pour le choix des clones, de tenir compte de ces résultats, surtout si l'on pense qu'il est possible de gagner jusqu'à 100.000 DM de plus par ha et sur 25 ans.

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Some clones of German grape varieties (Weißer Riesling, Müller-Thurgau, Grüner Silvaner, Gewürztraminer, Pinot noir et Blauer Frühburgunder) are tested with an orthogonal appliance for several years in different places of the vineyard of Rhenanie-Palatinat.

Mean results show that the crop characteristics are quite different according to places and different clones; the crop yield changes a lot from a clone to one another without decrease of quality.

Advices to vine growers concerning the choice of clones must include these important results. Profits up to DM 100,000 per hectare and per 25 years (mean time life of a vineyard) can be attempted from them.
Techniques simplifiées pour le dénombrement et l'identification des microorganismes vivants dans les moûts et les vins
Authors: Lafon-Lafourcade Suzanne , Joyeux Annick
Published: September 2016

Les microorganismes rencontrés dans les moûts et les vins : levures, bactéries lactiques et acétiques, sont représentés par un nombre limité d'espèces. Les auteurs proposent une technique rapide de dénombrement sélectif des trois populations en mélange et l'application de l'Api-system pour identifier les levures et les bactéries lactiques du vin.

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The number of microorganisms species occuring in musts and wines (yeasts, lactic and acetic bacteria) is limited. It is presented a quick, selective technique to count these miscellaneous microorganisms and application of Api-system for identification of yeasts and lactic bacteria of wine.
Text Messaging, Teen Outreach Program, and Sexual Health Behavior: A Cluster Randomized Trial
Authors: Bull Sheana , Devine Sharon , Schmiege Sara J. , Pickard Leslie , Campbell Jon , Shlay Judith C.
Published: September 2016

Objectives. To consider whether Youth All Engaged! (a text message intervention) intensified the effects of the adolescent pregnancy prevention Teen Outreach Program (control) for youths.

Methods. In this trial performed in Denver, Colorado, from 2011 to 2014, we randomized 8 Boys & Girls Clubs each of 4 years into 32 clubs per year combinations to ensure each club would serve as a treatment site for 2 years and a control site for 2 years. Control intervention consisted of the Teen Outreach Program only. We enrolled 852 youths (aged 14–18 years), and 632 were retained at follow-up, with analytic samples ranging from 50 to 624 across outcomes. We examined program costs, and whether the intervention increased condom and contraceptive use, access to care, and pregnancy prevention.

Results. Control program costs were $1184 per participant, and intervention costs were an additional $126 per participant (+10.6%). There were no statistically significant differences in primary outcomes for the full sample. Hispanic participants in the intervention condition had fewer pregnancies at follow-up (1.79%) than did those in the control group (6.72%; P = .02).

Conclusions. Youth All Engaged is feasible, low cost, and could have potential benefits for Hispanic youths.
A Clustered Randomized Controlled Trial of the Positive Prevention PLUS Adolescent Pregnancy Prevention Program
Authors: LaChausse Robert G.
Published: September 2016

Objectives. To determine the impact of Positive Prevention PLUS, a school-based adolescent pregnancy prevention program on delaying sexual intercourse, birth control use, and pregnancy.

Methods. I randomly assigned a diverse sample of ninth grade students in 21 suburban public high schools in California into treatment (n = 2483) and control (n = 1784) groups that participated in a clustered randomized controlled trial. Between October 2013 and May 2014, participants completed baseline and 6-month follow-up surveys regarding sexual behavior and pregnancy. Participants in the treatment group were offered Positive Prevention PLUS, an 11-lesson adolescent pregnancy prevention program.

Results. The program had statistically significant impacts on delaying sexual intercourse and increasing the use of birth control. However, I detected no program effect on pregnancy rates at 6-month follow-up.

Conclusions. The Positive Prevention PLUS program demonstrated positive impacts on adolescent sexual behavior. This suggests that programs that focus on having students practice risk reduction skills may delay sexual activity and increase birth control use.
It’s Your Game…Keep It Real in South Carolina: A Group Randomized Trial Evaluating the Replication of an Evidence-Based Adolescent Pregnancy and Sexually Transmitted Infection Prevention Program
Authors: Potter Susan C. , Coyle Karin K. , Glassman Jill R. , Kershner Sarah , Prince Mary S.
Published: September 2016

Objectives. To evaluate the effectiveness of an evidence-based HIV/sexually transmitted infection (STI)/pregnancy prevention program for middle schools implemented by school staff in South Carolina.

Methods. Twenty-four schools, representing 3143 youths, participated in a randomized trial from 2011 to 2014. Students completed surveys before programming (fall of seventh grade), after completing the 2-year It’s Your Game…Keep It Real program (spring of eighth grade), and 1-year postprogram (spring of ninth grade).

Results. There was no statistically significant effect on initiation of vaginal sex between baseline and eighth grade. Significantly fewer students in the comparison condition reported initiating sex at ninth grade, relative to the intervention condition. No group differences existed on other behavioral outcomes that addressed sexual activity in the past 3 months at ninth grade. Seven of 26 psychosocial outcomes (3 knowledge, 1 attitude, 1 self-efficacy, 2 personal limits) were positively affected at eighth grade; 4 remained significant at ninth grade.

Conclusions. The original studies’ behavioral effects were not replicated in this population, possibly as a result of this being an effectiveness trial instead of an efficacy trial, counterfactual exposure design issues, or postprogram exposure to evidence-based programming.
INVESTIGATION OF THE STABILITY FOR ESTABLISHED FLOWS IN OPEN PSEUDOPRISMATIC CHANNELS
Authors: Venherskyi Petro , Kokovska Yaryna
Published: September 2016

In this article the equations of channel flow of fluid are considered. They are described by the continuity equation and the momentum equation depending on the rate of flow and cross-sectional area of flow.

It is shown that natural phenomena significantly affect the flow stability and received a condition that ensures the stability of unstated flow at perturbation in initial and boundary conditions. Conditions of stability are checked on test examples, which depend on the following parameters: established movement parameters and middle and bottom slope angles.

It is shown that in such assumptions the system of equations of channel flow of fluid is stable, if received conditions is executed.
TASKS STATEMENT FOR MODERN AUTOMATIC CONTROL THEORY OF UNDERWATER COMPLEXES WITH FLEXIBLE TETHERS
Authors: Dudykevych Valery , Oleksandr Blintsov
Published: September 2016

The definition of a new class of control objects is proposed. It is an underwater complex with flexible tethers (UCFT) for which there is the need to automate motion control under uncertainty and nonstationarity of own parameters and external disturbances. Classification of marine mobile objects and characteristics of the flexible tethers as UCFT elements is given.

The basic UCFTs configurations that are used in the implementation of advanced underwater technologies are revealed. They include single-, double- and three-linked structures with surface or underwater support vessels and self-propelled or towed underwater vehicles.

The role of mathematical modeling in tasks of motion control automation is shown. The tasks of UCFT mathematical modeling are formulated for synthesis and study of its automatic control systems. Generalized structures of mathematical models of UCFT basic elements are proposed as the basis for the creation of simulating complex to study the dynamics of its motion.

The tasks of UCFT identification as a control object are formulated. Their consistent solution will help to obtain a UCFT mathematical model.

The basic requirements for UCFT automatic motion control systems are determined. Their satisfaction will ensure implementation of selected underwater technology.

Areas of development of synthesis methods of UCFT automatic control systems are highlighted.
O REGIME DE INTERNATO COMO ESTRATÉGIA DE EQUALIZAÇÃO DE OPORTUNIDADES AOS DISCENTES DO INSTITUTO FEDERAL DE EDUCAÇÃO, CIÊNCIA E TECNOLOGIA DO CEARÁ - CAMPUS CRATO
Authors: Costa Duarte Maria Lucileide , Queiroz Zósimo Mota
Published: September 2016

Objeto de pesquisas e estudos de conceituados autores, a residência estudantil passou por mudanças que refletiram na sociedade. O Programa Nacional de Assistência Estudantil - PNAES, em suas ações, cita o direito à moradia. O Instituto Federal de Educação, Ciência e Tecnologia do Ceará - campus Crato, desde sua gênese, tem o internato público masculino como fundamento de sua estrutura de ensino. No ano de 2008, através da Lei no 11.892 de 30 de dezembro, as escolas agrotécnicas integraram os Institutos Federais de Educação, Ciência e Tecnologia, renovando a organização e gestão, sem excluir a oferta e objetivo do internato. Objetiva-se com esse estudo conhecer o regime de residência estudantil, sua eficácia como política de assistência estudantil e otimizar essa estrutura de assistência ao educando. Trata-se de uma pesquisa bibliográfica, permeando o internato como política de assistência estudantil, sua trajetória histórico-social e sua efetivação na Instituição aqui referenciada. A metodologia utilizada consistiu na leitura de livros, artigos, documentos oficiais, leis e decretos para conhecimento do assunto e posterior descrição. Conclui-se que, uma vez implantado o regime de internato, a instituição não deve ignorar a responsabilidade por ele advinda, pois a residência estudantil é um serviço que oferece assistência integral ao alunado, além de ser um recurso para a captação e permanência de estudantes provenientes de famílias em situação de vulnerabilidade.
CAMPANHA PRATO LIMPO: EVITANDO O DESPERDÍCIO DE ALIMENTOS NO REFEITÓRIO DO IFPE CAMPUS BELO JARDIM
Authors: Bacalhau Silvia Patrícia de Oliveira Silva , Da Silva Maria do Socorro Santos , Alves Joelma Fortunato Cordeiro , Lopes Francisco Das Chagas Lino , Gomes Anderson Acioli , Ramos Gesilda Marques da Silva , Menezes Jessica Sabrina de Oliveira
Published: September 2016

Em comemoração ao Dia Mundial da Alimentação e considerando a quantidade de alimentos desperdiçada no refeitório do Campus Belo Jardim do Instituto Federal de Pernambuco (IFPE), foi lançada em 16 de outubro de 2012 a Campanha Prato Limpo. O objetivo da Campanha foi motivar os usuários a reduzir o desperdício de alimentos, contribuindo para o desafio atual da construção da sustentabilidade da vida no planeta. Este artigo trata-se de um estudo de caso sobre as atividades educativas acerca do tema realizadas durante quatro semanas no refeitório do Campus. As atividades foram compostas de: 1) entrega de folders informativos sobre desperdício de alimentos, alimentação saudável e regras da Campanha; 2) exposição em forma de gêneros alimentícios crus do quantitativo desperdiçado semanalmente: 246 kg; 3) entrega de cartela a ser carimbada sempre que o usuário devolvesse sua bandeja sem restos, para participação de sorteios; 4) concurso de frases e poesias sobre desperdício de alimentos; 5) exposição de frases educativas por todo o refeitório, em português e em inglês; 6) pesagem dos resí- duos ao final do horário do almoço. O concurso de frases teve quatro estudantes vencedores e o concurso de poesia, um. A redução do desperdício chegou a 61%. O objetivo da campanha foi alcançado, porém, é necessária a prática contínua da conscientização dos comensais sobre a importância do combate ao desperdício de alimentos, no sentido de se servirem somente do que vão ingerir. A diminuição na quantidade de resíduos sólidos traz economia para o serviço público e benefícios para o planeta.
A INSERÇÃO DO SERVIÇO SOCIAL NA ASSISTÊNCIA ESTUDANTIL DO IFCE, CAMPUS IGUATU - O INÍCIO DE UMA TRAJETÓRIA
Authors: Silva Adriana Alves , Lacerda Guilherme Brito
Published: September 2016

O presente estudo objetiva apresentar a inserção do Serviço Social na Assistência Estudantil do IFCE, Campus Iguatu, delineando seus primeiros passos, com vista a apreender as contribuições da prá- tica profissional do Serviço Social junto à assistência ao educando no momento histórico determinado. Configura-se como um estudo de caso retrospectivo e descritivo, com base no período de 2007 a 2011, sem generalizações, impactos ou relações causais. Como fundamentação teórica o estudo referenciou-se em leis, normas e portarias e demais arcabouços jurídicos que embasam a Política de Educação Brasileira e Assistência Estudantil além de literatura já produzida no Serviço Social sobre educação. Do estudo foi possível uma reflexão crítica das ações desenvolvidas, bem como a constatação de que o ingresso do Serviço Social no Campus Iguatu deu-se em virtude das exigências das determinações sociais, econômicas e políticas das expressões da questão social na sociedade com seus rebatimentos para a área de educação, os quais exigiram ações específicas desta área na assistência ao estudante.
The preparation of titanium carbide thin film of Ti6Al4V at low temperature and study of friction and wear properties
Authors: Liu Xiang , Liu Liguo , Sun Baoyong , Li Bingyue , Ke Xuefeng
Published: September 2016

In this article, the technology of salt bath carburizing at low temperature (640 °C) is used to prepare the titanium carbide thin film on Ti6Al4V alloy surface. The processed alloy sample surface phase and elements are observed by XRD and EDAX. The hardness of sample surface and permeability layer are measured by the MH-3 type microhardness meter. And the friction and wear contrast tests of the uncarburized and carburized samples are carried out using the M2000 friction and wear testing machine. The results show that: high hard phase carbide Ti8C5 is generated on the sample surface. The processed sample surface hardness is 953.28HV, which is 2.57 times of the original; The friction and wear properties of the carburized sample improve significantly; At 100 N, the uncarburzed wearing loss is 29 times of the carburized wearing loss, and at 300 N, the friction coefficient is reduced by 55.9 %.
The effect of damping on dynamic stress intensity factors in functionally graded materials
Authors: Ghajar Rahmatollah , Peyman Safa
Published: September 2016

Functionally Graded Materials (FGMs) are regarded as one of the most promising candidates for future advanced composites in many engineering applications. They can be classified as advanced materials characterized by variation in properties as the dimension varies. Since fracture is a key failure mode of FGMs, successful application of these materials depends on the understanding of their fracture mechanics. In addition, the stresses and displacements caused by dynamic loading can greatly differ from those associated with the corresponding static loading. This research focuses on obtaining Dynamic Stress Intensity Factors (DSIFs) in FGMs using displacement extrapolation method, considering the effect of damping. ABAQUS finite element package is applied to calculate displacement fields in FGMs. Accordingly, a User Material subroutine (UMAT) is written for implementing the continuous variation of material properties, and Rayleigh damping in the numerical analyses. In this research, the variations in properties of FGMs are considered exponentially; and the obtained results are compared with those presented in the technical literature. Then, the effects of different damping ratios on the DSIFs are investigated. According to the obtained results, damping has a significant effect on the DSIFs in FGMs. Therefore, ignoring this issue causes considerable errors in the results.
Effects of geometric features of highway horizontal alignment on steering behavior of passenger car
Authors: Shu Hai bo , Shao Yi-ming , Xu Jin
Published: September 2016

In order to elucidate the effects of the features of horizontal curves on the steering behavior of passenger car, the vehicle driving behavior when negotiating simple curves (tangent + circular section + tangent) was investigated. A complete dynamic model of a passenger car was developed using the Automatic Dynamic Analysis of Mechanical Systems (ADAMS) software. Virtual driving tests were conducted on simple curves with different parameters for two driving patterns: curve cutting and lane keeping. Based on the variation in the amplitude of the angle input of the steering wheel, the steering process of a passenger car was divided into three stages: curve entry, maintenance, and curve exit. The steering lengths and steering times corresponding to the vehicle entering, remaining in, and exiting curves were obtained for each driving pattern. The relationship between the two parameters and the curve radius as well as that between the two parameters and the deflection angle was thus determined. On the one hand, this study can be a guide for selecting the parameters for curve geometry design and, in particular, for determining an appropriate value of the spiral length. On the other hand, the correspondence between the steering wheel angle and the trajectory curvature should allow one to identify the three driving states, namely, straight driving, variable-curvature driving, and circular-curve driving. This should help in improving driver behavior and hence driving safety.
A feature extraction method based on ICD and MSE for gearbox
Authors: Wei Yu , Xu Minqiang , Li Yongbo , Huang Wenhu
Published: September 2016

Since the vibration signals of gearbox are non-linear and non-stationary, it is difficult to accurately evaluate the working conditions. Therefore, a fault feature extraction technique based on intrinsic characteristic-scale decomposition (ICD) and multi-scale entropy (MSE) is presented in this paper. The measured signals are firstly decomposed into a series of product components (PCs) by ICD. Secondly, the main product component is selected, and then MSE is used to extract the feature vectors from the selected PCs. Finally, the obtained feature vectors of gearbox with different scale factors are adopted as inputs of support vector machine (SVM) to fulfill the fault patterns identification. The superiority of the proposed technique is verified through comparing with three other methods.
The dynamic finite element model calibration method of concrete dams based on strong-motion records and multivariate relevant vector machines
Authors: Cheng Lin , Yang Jie , Zheng Dongjian , Tong Fei , Zheng Shiyu
Published: September 2016

In this work, a new finite element (FE) model calibration method of concrete dams based on strong-motion records and multivariate relevant vector machines (MRVM) is proposed. The modal features of a dam are extracted using second order blind identification (SOBI) based method at first. For some selected combinations of uncertain parameters of the FE model using the Latin hypercube design, the corresponding structural modal features are calculated using the finite element method (FEM). With these data, a procedure to calibrate the uncertain parameters of a dam’s dynamic FE model is developed. By taking the uncertain parameters as inputs and the calculated structural modal features using FEM as outputs, the MRVM model is trained to record the complex relationship between them. Then, the genetic algorithm (GA) is adopted to solve the optimization problem corresponding to the dynamic FE model calibration problem, and the trained MRVM model, instead of FEM, is used to obtain the modal parameters of a dam for different feasible solutions during the optimization search process to improve the computational efficiency. Using the simulated seismic response records of a numerical example the accuracy, robustness and computation efficiency of the proposed dynamic FE model calibration method is verified. The analysis result using the strong-motion records of a realistic concrete dam indicates that the proposed dynamic FE model calibration method has good performance.
Structural dynamic model updating based on Kriging model using frequency response data
Authors: Wang Jutao , Wang Chunjie , Zhao Junpeng
Published: September 2016

Metamodel technique is attracting more and more attention in structural dynamic model updating. In this paper, an attempt is made to explore the effectiveness of Kriging method for acceleration frequency response function based model updating. A Kriging model is constructed based on the input variables selected by F-test method specially, which is applied to the results of design of experiment. The response of design of experiment is obtained based on the errors between acceleration response curves of analytical model and experimental model. Two examples of representative structure are discussed, the comparison of updated results of different metamodel shows that a less error of updated results can be obtained based on Kriging model, and the updated analytical model has a good prediction capability. It can be concluded that the Kriging model is suitable for the frequency response function based model updating.
Stand for dynamic tests of technical products in the mode of amplitude-frequency modulation with hydrostatic vibratory drive
Authors: Nizhegorodov Anatolij , Gavrilin Alexey , Moyzes Boris , Ditenberg Ivan , Zharkevich Olga , Zhetessova Gulnara , Muravyov Oleg , Bets Mikhail
Published: September 2016

The article reviews the problems arising during the development of the stand for dynamic tests of technical products in the mode of amplitude-frequency modulation with hydrostatic vibratory drive. It is possible to control the change of the modulating function law and get various spectrograms of the oscillatory process and the oscillation mode with amplitude-frequency modulation, which allows to achieve the maximum effect of vibration tests in the stand.
Squeal reduction of a disc brake system with fuzzy uncertainties
Authors: Lü Hui , Shangguan Wenbin , Yu Dejie
Published: September 2016

Automotive brake squeal has become one of the major concerns in the automotive industry. The researches on suppressing brake squeal are of great practical significances. However, most of the existing researches have not taken into account the parameters uncertainties, although it is well known that uncertain factors widely exist in the brake systems. To reduce disc brake squeal more effectively, a practical approach for the stability analysis and improvement of an automotive disc brake system with fuzzy uncertainties is proposed. In the proposed approach, the uncertainties associated with friction coefficient, material properties and loading properties are taken into consideration, and the uncertain parameters of the brake system are represented by fuzzy numbers. The brake system stability is investigated by performing complex eigenvalue analysis (CEA), and response surface methodology (RSM) is employed to approximate the implicit relationship between the dominant unstable mode and system parameters. Then, the stability analysis model of the brake is constructed based on RSM, CEA and fuzzy analysis. As a numerical example, the stability analysis of a commercial disc brake system with fuzzy uncertainties is carried out, and the influences of different uncertain parameters on system stability are investigated. The analysis results show that the stability of the fuzzy brake can be improved effectively by increasing the specific modulus of back plate. The proposed approach can be considered as a potential method for squeal reduction of automotive disc brake systems under fuzzy case.
Lateral and torsional vibrations of cable-guided hoisting system with eccentric load
Authors: Wang Jinjie , Cao Guohua , Zhu Zhencai , Peng Weihong , Li Jishun
Published: September 2016

Theoretical investigation of the lateral and torsional vibrations of the hoisting cage in the cable-guided hoisting system caused by the eccentric load and the flexibility of the guiding cable is presented in this paper. The assumed modes method (AMM) is adopted to discretize the hoisting cable and two guiding cables, then Lagrange equations of the first kind are used to derive the equations of motion, while the geometric relationships between the hoisting cage and the cables are accounted for by the Lagrangian multiplier. Considering all the geometric matching conditions are approximately linear, the differential algebraic equations (DAEs) are transformed to the ordinary differential equations (ODEs). The dynamic responses of the hoisting cage are calculated, and especially the lateral displacements of the guiding cable and the constraints forces at the interfaces are obtained. Preload plays a vital role in affecting the cage vibration, thus, the effects of the total preload and the tension difference are analyzed. The numerical results indicate increasing the total preload can decrease the vibration displacements, while the tension difference has little impact on the vibration but can obviously change the constraint forces. In addition, the vibration displacements are directly proportional to the eccentric load, but less sensitive to the hoisting mass.
Vibroacoustic diagnostics of a radial microturbine and a scroll expander operating in the organic Rankine cycle installation
Authors: Z. Kaczmarczyk Tomasz , Żywica Grzegorz , Ihnatowicz Eugeniusz
Published: September 2016

The article presents the results of vibroacoustic research on a prototypical 4-stage radial microturbine and a scroll expander operating in the organic Rankine cycle with the low-boiling fluid HFE7100. The high-speed microturbogenerator had the electrical capacity of 3 kWe at the nominal speed of 24000 rpm. The low-speed expander with a capacity of 1 kWe and a nominal speed of 3600 rpm was made by Air Squared. The frequency characteristics and overall vibration level (vibration velocity Vrms) measurements were conducted for both the microturbine and the expander, depending on the rotational speed and on the power consumption of electrical energy receivers. The level of noise emitted by the microturbine and expander was also determined. The research was carried out for various electrical loads of the expansion devices generators running in the ORC system. The devices were tested in the following electric power ranges: from 550 We to 1150 We (scroll expander) and from 800 We to 1800 We (radial microturbine). Based on the obtained results, dynamic state assessment of the tested machines was performed and their noise and vibration levels were analysed.
Quality assessment of rainwater and harvested rainwater stored in different types of cisterns
Authors: Wu Lina , Gao Jianen , Zhao Wenjun , Xu Xiuquan , Yin Yan , Wu Lei
Published: September 2016

Rainwater is widely collected and stored in cisterns for domestic use due to extreme water scarcity and poor water quality on the Loess Plateau, China. However, little information exists on the effects of cistern materials and construction methods on water quality. This study assessed the quality of rainwater and harvested rainwater stored in different types of cisterns, using multivariate statistical analysis techniques. The harvesting system consisted of ditches underground to direct the water stream collected by catchments through pipes to the two-stage grit chambers, the rainwater runoff ultimately being fed into the cisterns. Water samples were collected monthly over 6 months from October 2008 to April 2009. The harvested rainwater generally did not meet drinking water standards due to severe bacterial contamination. To determine the factors affecting water quality, principal components and factor analysis divided the water's physicochemical composition into four principal components: ions, suspended pollutants, reducing substances, and acidity-alkalinity, which collectively accounted for 80.4% of the total variance. Cluster analysis confirmed the results. It was determined that pollutants in harvested rainwater were mainly derived from the catchments, surrounding fields, and local atmosphere. Furthermore, factor scores ranked water quality to select the optimum material and construction method. It was concluded that cement was superior to stabilized soil for rainwater storage. However, considering water quality, cost, and environmental friendliness the stabilized soil cistern using the stiff construction method was worthy of consideration.
Cooperação internacional científica e tecnológica: o caso do Fórum de Diálogo IBAS – Índia, Brasil e África do Sul (2003 – 2010)
Authors: Padilha Pereira da Silva Fabricio
Published: September 2016

Ciência e Tecnologia são comumente identificadas como vetores significantes ao desenvolvimento, especificamente num contexto de economia do conhecimento. O IBAS é um fórum de diálogo e de iniciativas de cooperação trilateral entre Índia, Brasil e África do Sul, cujos principais objetivos são coordenar sinergicamente suas políticas internacionais, por um lado, e facilitar a cooperação trilateral, por outro. Por meio da leitura do debate teórico sobre relações internacionais, cooperação científica e tecnológica e Fórum IBAS, além da análise de discursos políticos e acordos internacionais, o objetivo deste artigo é o de investigar o estado da arte da cooperação internacional científica e tecnológica no âmbito do Fórum.
O Pibid e a trajetória profissional de licenciados em Química
Authors: Dos Santos Bruno Ferreira , Moraes Jucimara De Jesus
Published: September 2016

Neste artigo são apresentados os resultados de pesquisa realizada com egressos de um curso de licenciatura em Química que foram bolsistas do Programa Institucional de Bolsas de Iniciação à Docência (Pibid). Os recém-graduados foram entrevistados por meio de questionários e entrevistas semiestruturadas. Seu objetivo principal foi o de conhecer os fatores que incidem sobre o que define sua trajetória profissional e as relações entre sua participação nesse programa de iniciação à docência e as escolhas profissionais. Os dados levantados foram analisados por meio da Teoria Fundamentada. A análise dos dados permitiu a elaboração de uma interpretação sobre as escolhas profissionais dos licenciados, cuja opção primordial pela educação permanente está representada pela formação como pesquisador, e a atuação como docente é postergada para o futuro ou como um projeto alternativo em suas trajetórias profissionais.
Brasil do ano 2000 revisitado: desafios em inovação tecnológica e o papel da universidade
Authors: Souza Pedro Bastos de
Published: September 2016

O presente estudo tem como objetivo revisar temas que estavam na ordem do dia no limiar do século XX em matéria de inovação, empreendedorismo e produção científica no Brasil, destacando o papel das universidades públicas nesse processo. Ressalta-se o papel da inovação no desenvolvimento socioeconômico e a necessidade de o Estado investir em políticas públicas na área. Debate-se em que medida houve uma evolução positiva no cenário brasileiro neste início de século XXI e quais são os pontos que permanecem pendentes. Enfatizam-se as conexões entre inovação e produção de conhecimento na universidade, com base em três eixos de análise: educação básica, regionalização do ensino superior e expansão da pós-graduação.
Gestão da concessão de carga horária para atividades de pesquisa em uma universidade não estatal: um estudo de caso
Authors: Costa Guilherme Holsbach , Lopes Cássio Guimarães
Published: September 2016

A manutenção da pesquisa científica tem sido um desafio financeiro para as universidades comunitárias (públicas não estatais). A alocação de carga horária destinada à pesquisa é um problema que envolve diversas variáveis, como a proporcionalidade entre professores contratados em regime de trabalho de tempo integral e professores sob outros regimes, a demanda de atividades administrativas e de ensino na instituição e o mérito científico de cada pesquisador, entre outras. Neste trabalho é apresentado um estudo de caso e, com base nele, é proposta uma solução para a gerência da concessão de carga horária para pesquisa. Essa solução baseia-se em um problema de otimização que considera a produtividade dos pesquisadores envolvidos, particularidades de cada área do conhecimento, as métricas de avaliação da produção da instituição em análise e a capacidade dessa instituição de conceder carga horária para pesquisa.
“Son más que piedras”: una biografía cultural de Los Guachimontones de Teuchitlán, basada en testimonios orales
Authors: Dansac Yael
Published: September 2016

En las biografías culturales sobre elementos materiales se exploran los roles de los objetos en las dinámicas sociales, teniendo en cuenta que el ciclo de vida de la cultura material está anclado al universo social y simbólico de las personas. Usando testimonios orales recolectados en la población rural de Teuchitlán, el presente artículo expone la biografía cultural del sitio arqueológico Los Guachimontones, que es un conjunto de estructuras arquitectónicas precolombinas cuya arquitectura singular e importancia histórica, lo han posicionado actualmente como un destino turístico y cultural. Tres periodos principales de Los ­Guachimontones son reconstruidos utilizando las voces de los entrevistados, quienes en­trelazan sus propias biografías con la historia de este espacio milenario.