bluuebunny/crossref_metadata_2025 huggingface dataset:
Biomineralization of Carbonate Minerals Induced by the Halophilic Chromohalobacter israelensis under High Salt Concentrations: Implications for Natural Environments
Authors: Han Zuozhen , Li Dan , Zhao Hui , Yan Huaxiao , Li Peiyuan
Published: May 2017

The mechanism underlying microbiologically induced carbonate precipitation have not been thoroughly characterized, although numerous scholars and experts have specifically investigated questions regarding minerals induced by bacteria. The study of the precipitation of carbonate minerals induced by halophilic bacteria has aroused wide concern. The present study aimed to investigate the characterization and process of biomineralization in high salt systems by a halophilic bacterium, Chromohalobacter israelensis strain LD532 (GenBank: KX766026), which was isolated from the Yinjiashan Saltern in China. Carbonate minerals induced by LD532 were investigated in several sets of comparative experiments that employed magnesium sulfate and magnesium chloride as Mg resources. Magnesium calcite and aragonite were induced by LD532 bacteria, whereas these minerals did not appear in the control group. The mineral phases, micromorphologies, and crystal structures were analysed using X-ray powder diffraction, scanning electron microscopy, and energy dispersive X-ray detection. The carbonic anhydrase and urease secreted by strain LD532 through metabolism increased the pH value of the liquid medium and promoted the process of carbonate precipitation. Further study using high resolution transmission electron microscopy, energy dispersive X-ray detection and analysis of ultrathin slices showed that the nucleation sites of carbonate minerals were located on extracellular polymeric substances and the membranes of intracellular vesicles of LD532 bacteria, which provided favourable conditions for the growth of carbonate mineral crystals. The morphologies and compositions of minerals formed in solutions of MgSO4 and MgCl2 display significant differences, indicating that different sources of Mg2+ may also affect the physiological and biochemical activities of microorganisms and thus mineral deposition. This study will be of some interest for the interpretation of carbonate biomineralization in natural salt environments and has some value as a reference in understanding sedimentary carbonates in ancient marine environments, such as tidal flats.
Peroxiredoxin 4 (PRDX4): Its Critical In Vivo Roles in Animal Models of Metabolic Syndrome Using Our Unique PRDX4 Transgenic Mice
Authors: Yamada Sohsuke , Guo Xin , Tanimoto Akihide
Published: May 2017

The peroxiredoxin (PRDX) family, a new family of proteins with a pivotal antioxidative function, is ubiquitously synthesized and abundantly identified in various organisms. In contrast to the intracellular localization of other family members (PRDX1/2/3/5/6), PRDX4 is the only known secretory form and protects against oxidative damage by scavenging reactive oxygen species in both the intracellular (especially the endoplasmic reticulum) compartments and the extracellular space. Recently, we generated unique human PRDX4 (hPRDX4) transgenic (Tg) mice on a C57BL/6J background and investigated the critical and diverse protective roles of PRDX4 against diabetes mellitus, atherosclerosis, insulin resistance, and nonalcoholic fatty liver disease (NAFLD) as well as evaluated its role in the intestinal function in various animal models. Our published data have shown that PRDX4 helps prevent the progression of metabolic syndrome by reducing local and systemic oxidative stress and synergistically suppressing steatosis, inflammatory reactions, and/or apoptotic activity. These observations suggest that Tg mice may be a useful animal model for studying the relevance of oxidative stress on inflammation and the dysregulation of lipid/bile acid/glucose metabolism upon the progression of human metabolic syndrome, and that specific accelerators of PRDX4 may be useful as therapeutic agents for ameliorating various chronic inflammatory diseases.
Magnetic Characterization of Hypervalent Chromium Intermediates in the Reduction of Chromium(VI) by Glutathione in Acidic Solutions
Authors: Marín Roberto A. , Kolesnik Stanislaw
Published: May 2017

Chromium (VI) is carcinogenic through intermediates formed in the cellular milieu by reduction with small reductants like glutathione (GSH), ascorbate (As), cysteine (Cys) and NADPH. Although the reduction of chromate by thiols have been investigated, the participation of Cr(IV) intermediates has been inferred only indirectly due to its refractive behavior towards EPR spectroscopy and the lack of true chromium (IV) complexes for comparative studies. Biological data from numerous reports indicate that Cr(IV) is the species most likely responsible for the carcinogenicity of Cr(VI). Our kinetic studies suggested that in acidic solutions the reduction of chromate with GSH affords mostly a chromium(IV) intermediate. As a step towards the full characterization of the paramagnetic species involved in the reduction of chromate by thiols at neutral pH, we embarked in the investigation of this reaction using the Superconducting QUantum Interference Device (SQUID) Magnetic Property Measuring System®. Our results indicate a strong influence of the temperature. At 2K, the saturation magnetization method was applied to the frozen reaction when it reached the peak of formation of intermediates. Contrary to our expectations, the contributions were calculated to be 30 % of Cr(IV) and 69 % of Cr(V) at this pH. When the Curie-Weiss method was utilized, the effective magnetic moment was dependent on the portion of the data utilized and generally higher proportion of Cr(IV) was found when the fitting is performed with data from higher temperature.
Effects of Hydroalcoholic Extract of Celtis iguanaea on Markers of Cardiovascular Diseases and Glucose Metabolism in Cholesterol-Fed Rats
Authors: Zanchet Barbara , Gomes Denise B. , Corralo Vanessa S. , Diel Kriptsan A. P. , Schönell Amanda P. , Faust Caroline , Nicola Patrícia , Muller Liz G. , Zanatta Ana Paula , Wildner Silvana M. , Bevilaqua Fernanda , Chitolina Rafael , Sachett Adrieli , Zanatta Leila , Duarte Marta M. M. F. , Conterato Greicy M. M. , Rocha Claudia Q. , Peretti Camile , Brumelhaus Tatiane , Alves Nayara Souza , Menegatt Jean Carlo Olivo , Conte Fernanda , Serena Guilherme , Ramos Adriano Tony , Zimermann Francielli Cordeiro , Roman Junior Walter A.
Published: May 2017

Celtis iguanaea is popularly used in the treatment of diabetes mellitus. However, thorough chemical and pharmacological investigations regarding its activity are lacking. In this study, we investigated the effects of the hydroalcoholic extract from C. iguanaea (CI) on markers of cardiovascular diseases and the glucose metabolism in cholesterol-fed rats. Therefore, hypercholesterolemic rats (1% cholesterol) were orally treated with CI (150, 300, or 600 mg/kg) or simvastatin (4 mg/kg) (n = 6) once a day for 30 days along with a hypercholesterolemic diet. A control group (C) was given saline solution. CI showed significant decreases in serum levels of total cholesterol, LDL-cholesterol, HMG-CoA-reductase, IL-1, IL-6, TNF-α, and IFN-γ when compared to group C (p ˂ 0.05). Hypoglycemic effects were observed along with a decrease of the activity of sucrase (CI 600), maltase (CI 150, CI 300), and an increase in muscle glycogen levels (CI 300). Antioxidant effects were observed in plasma, and the histopathological analysis showed a significant decrease in the liver fat area for CI compared to group C (p < 0.001). Our results suggest that the biological effects of CI could be related to the presence of flavonoids that possibly exert antioxidant, enzymatic inhibitory, and insulin-mimetic effects.
The Investigation of Electrochemistry Behaviors of Tyrosinase Based on Directly Electrodeposited Graphene on Choline–Gold Nanoparticals
Authors: He Yaping , Yang Xiaohui , Han Quan , Zheng Jianbin
Published: May 2017

A novel catechol (CA) biosensor was developed by the immobilization of tyrosinase (Tyr) onto in situ electrochemical reduction graphene (EGR) on choline functionalized gold nanoparticals (AuNPs–Ch) film. The results of UV–visible spectra indicated that Tyr retained its original structure in the film. And electrochemical investigation of the biosensor showed a pair of well–defined, quasi–reversible redox peaks with Epa= –0.0744V and Epc= –0.114 V (vs. SCE) in 0.1 M, pH 7.0 sodium phosphate buffered saline at the scan rate of 100 mV/s. The transfer rate constant ks was 0.66 s–1. The Tyr–EGR/AuNPs–Ch showed a good electrochemical catalytic response for the reduction of CA, with the linear range from 0.2 to 270 μM and a detection limit of 0.1 μM (S/N= 3). The apparent Michaelis–Menten constant was estimated to be 109 μM.
Research and Analysis on Localization of 3-D Single Source in Lossy Medium Using Uniform Circular Array
Authors: Xue Bing , Qu Xiaodong , Fang Guangyou , Ji Yicai
Published: May 2017

In this paper, the methods and their analysis for estimating the location of three dimension (3-D) single source buried in lossy medium are presented with uniform circular array (UCA). The mathematical model of the signal in the lossy medium is proposed. Using location information in the covariance matrix obtained by sensors’ output, the equations of the source location (azimuth angle, elevation angle and range) are obtained. The phase and amplitude of the covariance matrix function are used to process these equations respectively. Then, the phase and amplitude of the covariance matrix function are used to process the source localization in the conductive medium together. By analyzing the characteristics of the proposed methods and MUSIC method, the computational complexity and the valid range of these methods are given. From the results, whether the loss is known, we can choose the appropriate method to process the issues (localization in lossless medium or lossy medium).
HUBUNGAN PENDAPATAN KONSUMEN DAN MOTIVASI PEMBELIAN TELUR AYAM BERLABEL DI KAWASAN YOGYAKARTA
Authors: Utami Sri Sari , Mulyo Jangkung Handoyo , Waluyati Lestari Rahayu
Published: May 2017

ABSTRAK
Trend konsumsi pangan sehat kini terus meningkat terutama di negara-negara berkembang termasuk di Indonesia. Minat masyarakat mengkonsumsi pangan sehat tersebut menjadi peluang bagi para produsen untuk terus mengembangkan produknya. Telur ayam berlabel merupakan telur ayam premium yang dijual dengan kemasan dan label tertentu. Kualitas telur ayam ini diklaim mempunyai keunggulan dibanding telur ayam ras. Tujuan dari penelitian ini adalah mengetahui ada tidaknya hubungan pendapatan dan motivasi pembelian telur ayam berlabel di kawasan Yogyakarta. Responden merupakan konsumen telur ayam berlabel yang melakukan pembelian telur berlabel secara rutin. Responden terdiri dari 50 orang yang dipilih dengan teknik inisidental sampling. Hubungan pendapatan dan motivasi pembelian telur ayam berlabel dihitung dengan Uji chi Square. Hasil analisis menunjukkan bahwa konsumen pada berbagai tingkat pendapatan mempunyai motivasi yang tinggi untuk melakukan pembelian telur ayam berlabel . Berdasarkan hasil tersebut diketahu bahwa tidak terdapat hubungan antara pendapatan dan motivasi pembelian telur ayam berlabel.

ABSTRACT

The Trend of healthy food consumption has continuously increased, especially in developing countries, including Indonesia. Public interest in consuming healthy food is an opportunity for producers to develop products. Labeled Chicken eggs is a premium chicken eggs with a specific packaging and labelling. The quality claimed have more advantages compaed to bulk chicken eggs. The aim of this research was to determine the influence of income toward purchase intention of labeled chicken eggs in Yogyakarta. Respondents that used are labelled egg consumers that purchase regularly. respondents consist of 50 people that chosen by incidental sampling techniques. Relations of consumer income and purchase intention calculated by Chi Square Test. Chi Square test is a test of cross tabulation were used to examine the relationship between variables. The result show that consumers at all income levels have a high purchase intention in labeled eggs. Based on these results means that there is no relationship between income and purchase intention of labeled eggs.
O Futuro do Hospital Nossa Senhora está em Suas Mãos
Authors: Centenaro Andressa , Bonemberger Angela Maria Ortolan , Sartori Tainara , Guimarães Julio Cesar Ferro de
Published: April 2017

A gestão de um hospital filantrópico é mais complexa do que aparenta. Embora receba benefícios fiscais, sua gestão depende de tomada de decisões tal qual as empresas privadas. A organização em estudo, o Hospital Nosso Senhora, trata de uma instituição Filantrópica, ou seja, sem fins lucrativos, idealizada por um grupo de indivíduos visionários na década de 80, que fundam um Hospital para melhor atender a comunidade. Porém a manutenção dessa instituição se torna uma tarefa que exige muito dos gestores. Após ter passado por duas crises financeiras, o futuro do Hospital Nossa Senhora está incerto, e depende de uma série de tomada de decisões de seus gestores. Diante ao exposto, esse caso procura fazer uma discussão sobre a gestão das instituições sem fins lucrativos e sobre a dificuldade dos hospitais frente aos problemas de gestão pública e do Sistema Único de Saúde.
A Participação Social na Implantação do Curso de Licenciatura em Educação do Campo na Universidade Federal de Santa Catarina
Authors: Moreira Katia Denise , Rodrigues Luci Mari Aparecida , Dias Ilane Frank
Published: April 2017

Atender as singularidades da educação no campo é um ato social urgente. Nesse sentido, este estudo de caso apresenta uma análise de como aconteceu o processo da participação social na implantação do Curso de Graduação em Licenciatura em Educação no Campo da Universidade Federal de Santa Catarina. Trata-se de uma pesquisa de abordagem qualitativa e em relação às técnicas de coleta de dados, utilizou-se a bibliográfica, a documental e entrevistas semiestruturadas, com seis atores sociais envolvidos, diretamente, com o Curso. Como categorias de análise optou-se pelos critérios de avaliação da qualidade democrática dos processos participativos, Castellà e Parés (2012), com foco nas dimensões “Quem participa?” e “Sobre o que se Participa?”. Os resultados da pesquisa apontaram que os critérios citados foram contemplados no momento de implantação do curso. No entanto, constatou-se que atualmente ocorre um distanciamento dos movimentos sociais em relação ao acompanhamento das políticas e ações inerentes ao curso.
Fratura de complexo zigomaticomaxilar por prática esportiva: relato de caso
Authors: Mulinari dos Santos Gabriel , Akabane Sara Tiemi Felipe , Reis Erik Neiva Ribeiro de Carvalho , Pires William Ricardo , Coléte Juliana Zorzi , Souza Francisley Ávila , Faverani Leonardo Perez , Magro Filho Osvaldo , Garcia Júnior Idelmo Rangel
Published: May 2017

Devido a sua localização projetada na face, o complexo zigomaticomaxilar é uma região comumente acometida por traumas e injúrias, fraturando-se pela ação direta de forças, ocasionando uma mudança em sua projeção anteroposterior e laterolateral. As etiologias dos traumas que podem provocar uma fratura nessa região podem variar, sendo em grande parte as agressões físicas, acidentes de trânsito e esportivos. Objetivo: apresentar um relato de caso clínico de um paciente de 17 anos, gênero masculino, sem histórico de alergias ou comorbidades, vítima de acidente esportivo. Ao exame físico extrabucal foi possível observar edema em hemiface esquerda, degrau palpável em sutura frontozigomática e equimose periorbitária esquerda. Ao exame intrabucal observou-se fratura de pilar zigomático com oclusão mantida. O tratamento cirúrgico foi realizado através da fixação com miniplaca e parafusos do sistema 1.5 em sutura frontozigomática e miniplaca 2.0 em “L” no pilar zigomático. Conclusão: Com base no exposto, a fixação interna rígida com uso de miniplacas em sutura frontozigomática e pilar zigomático mostrou-se efetiva para restabelecer o adequado posicionamento do complexo zigomaticomaxilar, devolvendo também melhores condições funcionais, estéticas e psicológicas ao paciente. Descritores: Fraturas maxilares; Fraturas Zigomáticas; Traumatismos Faciais.
Candidíase oral em usuários de próteses dentárias removíveis: fatores associados
Authors: Freire Julliana Cariry Palhano , Nóbrega Marina Tavares Costa , Freire Stéphanie Cariry Palhano , Dias-Ribeiro Eduardo
Published: May 2017

A estomatite protética tem sido considerada a lesão bucal mais frequentemente observada em usuários de próteses removíveis. Em portadores de próteses está comumente associada à presença de Candida. Esse estudo objetivou realizar um levantamento da literatura sobre os fatores associados ao desenvolvimento de candidíase oral em usuários de próteses dentárias removíveis. Realizou-se uma busca na literatura através da base de dados PUBMED com as seguintes palavras-chave: Candida, Candidíase bucal e Prótese dentária. Foram encontrados 12 artigos científicos que se enquadraram ao tema proposto. Diante dos resultados, observou-se que a estomatite protética está relacionada à presença de Candida. Em usuários de próteses, essa presença de espécies de Candidaé maior do que em não usuários e a espécie mais isolada é a C. albicans. A má higienização da prótese é um dos fatores associados ao desenvolvimento de candidíase oral. Cuidados com a higiene oral e da prótese são necessários para o controle da microbiota oral e prevenção da candidíase oral.Descritores: Candida; Candidíase Bucal; Prótese Dentária.
Método de adesão ao tratamento de pacientes hipertensos
Authors: Silva Thais de carvalho da , Dantas Allana Baleeiro , Silveira Emilene Valim dos Santos , Reis Helen Gonçalves , Silveira Jéssica de Paula , Caproni Samara Menali Pereira , Menezes Bruna Dias , Lima Ciderléia Castro de
Published: May 2017

A hipertensão arterial sistêmica (HAS) é uma das maiores causas de morbidade e mortalidade no mundo. Níveis de pressão arterial elevados estão relacionados a uma maior incidência de eventos mórbidos, associados principalmente à aterosclerose e manifestados por cardiopatia isquêmica, acidente vascular cerebral e doenças vasculares renal e periférica. O controle da HAS está diretamente relacionado ao grau de adesão do paciente ao regime terapêutico. O  objetivo do estudo é identificar as causas da não adesão ao tratamento medicamentoso e comportamental de indivíduos portadores de hipertensão arterial sistêmica e caracterizar o perfil epidemiológico dessa clientela.Trata-se de uma pesquisa de campo de abordagem quantitativa e qualitativa. O estudo foi realizado em Estratégias de Saúde da Família (ESF) do município de Alfenas-MG, o período para a coleta dados foi no segundo semestre de 2014, tendo como instrumento para a coleta um questionário elaborado sob o auxílio de profissionais da área de psicologia o que permitiu uma abordagem de avaliação global na adesão ao tratamento para classificar o nível de adesão em cinco graus.Descritores: Terapêutica; Hipertensão; Saúde Pública; Medicina Preventiva.
A LUTA PELA TERRA COMO LUTA POR DIREITOS: DESAFIOS E PERSPECTIVAS DAS COMUNIDADES TRADICIONAIS NO CAMPO BRASILEIRO
Authors: Perdigão de Castro Luís Felipe
Published: April 2017

O presente artigo debate a ideia de desenvolvimento e modernização no meio rural, focando sobre o significado da “Revolução Verde”, enquanto projeto conservador de antigas estruturas agrárias no Brasil. Analisa-se a modernização conservadora no contexto das comunidades tradicionais, enfatizando que a dimensão sociocultural da terra amplia o significado das lutas e dos direitos territoriais para agricultores familiares, nações indígenas, comunidades quilombolas e outros povos tradicionais. O pano de fundo é discutir, histórica e culturalmente, as formas de agir e viver das categorias sociais, buscando na perspectiva de seus valores um potencial de desenvolvimento agrícola que ultrapasse o binômio capital-terra. O objetivo é, através de pesquisa bibliográfica, debater a dinâmica de definição, conquista e exclusão de direitos fundamentais e identidades culturais no meio rural brasileiro.
A BANALIDADE DO MAL E O JULGAMENTO DE EICHMANN
Authors: Tizzo Fabiano Miranda do Nascimento
Published: April 2017

O artigo pretende analisar a visão de Hannah Arendt (1906 –1975) sobre o julgamento do ex-nazista Otto Adolf Eichmann (1906 –1962) e à ideia de banalidade do mal pensada pela autora ao longo do julgamento. Para Arendt, o totalitarismo nazista criou um modelo novo de criminoso, pois o extermínio sistemático e organizado de milhões de seres humanos não é visto somente como monstruosidade por parte de um grupo, mas um ato cometido por pessoas que cumpriam meras obrigações burocráticas, assim como Eichmann. Portanto, nossa análise se concentrará no cumprimento de ordens associado a irreflexão, responsabilidade legal, inversão de valores morais provocada pelo Estado nazista, nos massacres administrativos e o perfil do réu.
The European Central Bank, machinic enslavement, and the Greek public
sector
Authors: Selmic Radman
Published: May 2017

This article investigates the role of the European Central Bank (ECB) in
transferring financial and moral responsibility for the Eurozone crisis from
the private to the public sector. Focusing on Greece, I argue that the ECB
constructed the morality of the public debtor in such a way as to make this
transfer of responsibility easier and the imposition of austerity measures
justifiable. This in part relied on a shift in the ECB's discourse, which
came to define the crisis exclusively in terms of public sector
responsibility. However, the ECB also employed a range of non-linguistic
policy measures aimed at intervening in the crisis. To interpret these
measures I draw on Deleuze and Guattari's concept of ‘machinic enslavement’,
arguing that the ECB contributed to the Greek crisis not only by defining it
discursively but also by reshaping the country's financial infrastructure in
crucial ways.
Experimental study on flint hammerstone use in Discoid-Levallois technologies: A comparison with the workshop assemblages of the central Iberian Peninsula
Authors: Navarro Víctor Lamas , Díaz Pérez Sara , Bustos-Pérez Guillermo , Cuartero Monteagudo Felipe , Torres Navas Concepción , Baena Preysler Javier
Published: May 2017

The basins of the Manzanares and Jarama rivers have been connected to human activity since the early Palaeolithic. At the boundary between these rivers the abundance of flint has given place to exploitation and mining activities even in historical times. In recent years, projects related to urban expansion in the southeast of Madrid have brought to light various Palaeolithic deposits associated with workshops and tool production. These sites do not have evidence of river pebbles of quartzite, quartz or sandstone in the immediate environment that could have been used as hammerstones, meaning that hammerstones in these raw materials had to be transported and introduced into the sites from large distances. Given this situation, attention was paid to flint elements that show clear signs of being used as hammerstones. The aim of this study is to test the effectiveness of flint as hammerstone, testing whether the use of this raw material is indifferent to other rock types or if you have limitations or advantages in this regard. An experimental protocol was developed, allowing to observe specific knapping behaviours and justifying them in the archaeological and technological context in which they are located.
Knapping methods and techniques in the bracelets quarry of Cortijo Cevico (Loja, Granada)
Authors: Martínez-Sevilla Francisco , Morgado Rodríguez Antonio , Jiménez Cobos Francisca , Gutiérrez Rodríguez Mario , López García Antonio , Lozano Rodríguez José Antonio , Carrasco Rus Javier
Published: May 2017

The stone bracelets are one of the most outstanding elements of personal ornaments of the ancient Neolithic in Western Mediterranean and the South of the Iberian Peninsula (5500-4800 cal. BCE). These bracelets are considered an element of cultural identity and a chronological marker of the first Neolithic societies in these areas. The study of the production processes of this ornament has brought a new approach to social relations of the early Neolithic groups of this area. The existence of specialized workshops and the circulation of these objects show the shift towards more complex social organizations. The aim of this paper is to present knapping methods and techniques carried out in the Neolithic bracelets quarry of the Cortijo Cevico. This quarry has recently been discovered and excavated, and it is the first site of its kind in the Iberian Peninsula. It is a rocky outcrop in the geological formation of Trías de Antequera, formed by dolomitic marbles. On this site we carried out the extraction works, as well as the first transformation of the knapping performs that were going to be processed as bracelets. In addition, we have applied for the first time in this paper the methodology consists on using diacritical schemes in the knapping waste of the bracelets. This methodology, along with experimentation and technical stigmas, has allowed the recognition of the techniques and methods applied to knapping dolomitic marbles and these are presented for the first time in this paper.
Procurement and mobility during the Late Pleistocene: Characterising the stone-tool assemblage of the Picamoixons site (Tarragona, NE Iberian Peninsula)
Authors: Soto María
Published: May 2017

The Picamoixons site is a rockshelter located in the province of Tarragona (NE Iberian Peninsula). It was object of two rescue campaigns during 1988 and 1993, which led to the recovery of a complete archaeological assemblage, including stone tools as well as faunal and portable art remains that date the occupation to the 14th to 11th millennium BP (calibrated). This study involves a petrographic characterisation of the stone-tool assemblage in order to establish: 1) the procurement areas, 2) the raw materials management strategies and 3) the mobility radius and territorial sizes of the hunter-gatherers groups that occupied the site. The method applied comprises in a multiscale analysis that includes systematic prospection, the petrographic characterisation of geological and archaeological samples, an analysis of the chert types represented in the knapping sequence, and the definition of the mobility axes and areas frequented according to lithic procurement.A petrographic analysis of the chert in the prospected area led to the definition of nine macroscopic varieties related to five types (Vilaplana, Morera, Maset, Vilella and Tossa cherts), related to Lower and Upper Muschelkalk (Triassic), Lutetian, Bartonian (Palaeocene) and Sannonian (Oligocene) deposits.The study of the knapping sequences indicates the main exploitation of Bartonian cherts (Tossa type), and the use of Lutetian cherts (Maset and Morera types) for configuring retouched tools. The exploitation of the remaining raw material types identified is considered sporadic and opportunistic.Defining the procurement areas enabled the mobility radius to be assessed as between 3 and 30 km, highlighting the importance of the fluvial basins as natural movement pathways. The results indicate that the main procurement territory was 16 km2 in area, associable with a forager radius. The most remote procurement distances suggest a maximum exploitation area of 260 km2, defining an intra-regional range. This range presents parallelisms with various contemporaneous hunter-gatherers groups in Western Europe, suggesting a progressive mobility reduction dynamic during the Late Pleistocene-Initial Holocene.
Rubens en la pintura novohispana de mediados del siglo XVII
Authors: Ruiz Gomar Rogelio
Published: April 2017

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La expresión pictórica religiosa y la sociedad colonial
Authors: Vargaslugo Elisa
Published: April 2017

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Santuarios huicholes en la Sierra de Tenzompa, (Jalisco)
Authors: Hers Marie-Areti
Published: April 2017

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Loie Fuller en México
Authors: Dallal Alberto
Published: April 2017

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Cómo nacieron los cines
Authors: De los Reyes Aurelio
Published: April 2017

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Cifra, signo y artilugio: el “ocho” de Guadalupe
Authors: Cuadriello Jaime
Published: April 2017

Desde la reconsideración de los estudios asincrónicos y la resignificación de las imágenes, propuestos por Georges Didi-Huberman, en este estudio de caso se explora la emergencia de una “imagen espontánea”: el número ocho que en el tobillo de la imagen guadalupana de México detectaron el pintor Miguel Cabrera y el historiador Mariano Fernández de Echeverría y Veytia. Una cifra enigmática que devino en signo exegético y acabó, por efecto de los juegos retóricos, en un artilugio de hondo mensaje profético, incluso libertario. El número ocho, además, resultó una práctica pictórica inherente al concepto de vera effigie o casi una manera de autentificar las copias del ayate de Juan Diego. Este signo devoto y promisorio no escapó, sin embargo, a la crítica ilustrada y racionalista del siglo XVIII pese al prestigio del pintor que lo reportó en su dictamen Maravilla americana de 1756.
Jorge Alberto Manrique: El transgresor (1936-2016)
Authors: Rosas Miguel Ángel
Published: April 2017

La trayectoria de Jorge Alberto Manrique en el mundo de la historia del arte latinoamericano traza paralelos entre su pensamiento historicista y el análisis del ambiente artístico. El interés de este tributo es abordar la vida de un hombre que buscó responder a la pregunta: ¿cómo se forma un historiador e historiador del arte? Este texto, estructurado de forma cronológica, nos familiariza primero con el Manrique previo a los encuentros con pensadores como Edmundo O’Gorman, Francisco de la Maza y Justino Fernández. ¿Cuáles fueron sus referencias iniciales, quiénes fueron sus maestros y cómo definió su posición a partir del historicismo son algunas de las preguntas que encuentran respuesta. La oposición dialéctica entre la historia y la historia del arte, apertura y tradición, manierismo y barroco, así como la postura de Manrique frente a lo mexicano, forjada desde el interior de una generación en tránsito, son resultado de una crisis en la que el triunfo de uno es permeado por el otro, similar a “un objeto herido en el que han quedado huellas”. Ese rigor hegeliano —el giro dialéctico filosófico— es el que fundamentó su vida profesional. Así, esta semblanza, además de dejar prueba de las líneas de investigación de Manrique, es una forma de rendir homenaje a uno de los historiadores y críticos de arte más importantes, quien, entre otros aportes, impulsó al Instituto de Investigaciones Estéticas (unam) a abrirse al ámbito internacional.
Automatically Determining Versions of Scholarly Articles
Authors: Rothchild Daniel , Shieber Stuart
Published: May 2017

Background: Repositories of scholarly articles should provide authoritative information about the materials they distribute and should distribute those materials in keeping with pertinent laws. To do so, it is important to have accurate information about the versions of articles in a collection.Analysis: This article presents a simple statistical model to classify articles as author manuscripts or versions of record, with parameters trained on a collection of articles that have been hand-annotated for version. The algorithm achieves about 94 percent accuracy on average (cross-validated).Conclusion and implications: The average pairwise annotator agreement among a group of experts was 94 percent, showing that the method developed in this article displays performance competitive with human experts.
A validation study of reconstructed rapid prototyping models produced by two technologies
Authors: Dietrich Christian Andreas , Ender Andreas , Baumgartner Stefan , Mehl Albert
Published: May 2017

Objective:

To determine the accuracy (trueness and precision) of two different rapid prototyping (RP) techniques for the physical reproduction of three-dimensional (3D) digital orthodontic study casts, a comparative assessment using two 3D STL files of two different maxillary dentitions (two cases) as a reference was accomplished.

Materials and Methods:

Five RP replicas per case were fabricated using both stereolithography (SLA) and the PolyJet system. The 20 reproduced casts were digitized with a highly accurate reference scanner, and surface superimpositions were performed. Precision was measured by superimposing the digitized replicas within each case with themselves. Superimposing the digitized replicas with the corresponding STL reference files assessed trueness. Statistical significance between the two tested RP procedures was evaluated with independent-sample t-tests (P < .05).

Results:

The SLA and PolyJet replicas showed statistically significant differences for trueness and precision. The precision of both tested RP systems was high, with mean deviations in stereolithographic models of 23 (±6) μm and in PolyJet replicas of 46 (±13) μm. The mean deviation for trueness in stereolithographic replicas was 109 (±4) μm, while in PolyJet replicas, it was 66 (±14) μm.

Conclusions:

Comparing the STL reference files, the PolyJet replicas showed higher trueness than the SLA models. But the precision measurements favored the SLA technique. The dimensional errors observed in this study were a maximum of 127 μm. In the present study, both types of reproduced digital orthodontic models are suitable for diagnostics and treatment planning.
Micro hydro installation analysis in a wastewater treatment plant
Authors: H. Beltran  , R. Vidal  , L. Basiero  , J.M. Santos  , J.A. Basiero  , E. Belenguer
Published: May 2017

This paper introduces the technical and economic viability of a new micro hydro installation solution designed to reduce the power consumption of a medium-sized wastewater treatment plant. The work analyses the hydroelectric potential of the plant and summarizes the turbine-generator design procedure performed to optimize the production. Results demonstrate the viability when energy produced is used for self-consumption.
Evaluation of Maximum Power Point Tracking Algorithms for Photovoltaic Electricity Generation in Kuwait
Authors: Mohamed A. El-Sayed  , Steven Leeb
Published: May 2017

Consumption of electrical energy in Kuwait is rapidly increasing. The production of this energy currently depends mainly on oil and its derivatives to drive the different power plants in the country. The combustion of such fossil fuel comes with a well-known environmental pollution. Local oil production represents a key income for Kuwait and intelligent consumption of oil is therefore an essential concern to the Kuwait economy. The power system and economy of Kuwait may benefit from utilizing clean and renewable energy resources such as solar energy. This paper considers the modelling and control of PV system using in market available modules as an example, and factoring in geographical conditions relevant to Kuwait. As the generated power from PV panel depends on solar irradiation and temperature, the hourly values of these meteorological factors are collected and analysed for a time horizon of 6 years. Based on the system model three widely-adopted MPPT algorithms are compared and their performances are evaluated. Validation of each algorithm model is carried out using MATLAB/Simulink simulations.
Proposal of a Hybrid System for Solar and Photovoltaic for Lighting Low Cost
Authors: Ando Junior, O. H.  , Rosa, H. B.  , Spacek, A. D.  , Malfatti, C. F.  , Schaeffer, L.
Published: May 2017

This work consists of the study and development of a hybrid lighting system that uses Led as artificial light source and sunlight as a natural source. Starts with a survey of this technology being developed in the tubular lighting system as well as the search for its replacement by alternative materials as a way to fund the project, uniting quality and reduced cost. With the definition of constructive elements, proceeds to the beginning of project design and development of control to maintain brightness in the environment system. Using as guidance the Brazilian Standards, which govern the methods of measuring brightness, as well as the procedure for creating models scaled tools. Finally presents the tests and their results, demonstrating the possibility of developing a hybrid lighting system at low cost.
Modular buck-boost transformerless grid-tied inverter for low voltage solar panels
Authors: Hugo Nunes  , Nelson Pimenta  , Luís Fernandes  , Paulo Chaves  , J.M. Dores Costa
Published: May 2017

This paper deals with a transformerless AC module for low DC voltage output photovoltaic solar panels. The DC to AC converter was designed to be a single-phase grid-tied inverter, and is based on a buck-boost topology with current mode control to shape the current and to adjust delivered power. The common ground node prevents voltage fluctuations and increases people´s safety. Low power inverters tend to be less efficient than larger ones and are prone to higher harmonic distortion. To overcome these drawbacks, special care was taken in designing the power stage, and harmonic compensation was included in the control stage. The inverter has MPPT capability and operates with unity power factor. Inverter´s operation is analysed, and some simulation results are presented. A 220Wp two-stage single-phase AC module prototype, with 240V and 50Hz sine-wave output, was build and connected to a low voltage photovoltaic solar panel. Experimental results for this plug-and-play converter are here presented.
Indirect estimation of overhead line ampacity in overhead lines integrating wind farms
Authors: A. González  , A. Madrazo  , R. Domingo  , R. Martínez  , M. Mañana  , A. Arroyo  , P. Castro  , D. Silió  , C. Valli  , I. Montenegro
Published: May 2017

Ampacity techniques have been used by Distributor System Operators (DSO) and Transport System Operators (TSO) in order to increase the static rate of transport and distribution infrastructures, especially those who are used for the grid integration of renewable energy. In some cases, especially when the overhead lines are used to evacuate energy from wind farms, there is a direct correlation between the ampacity of the overhead lines and the active power produced by the wind farms. This papers analyses this correlation considering the most important weather parameters like wind, ambient temperature and solar irradiation.
Optimization of Initial Cell Density and Usage Efficiency of Seed Culture Medium During Lipid Production from Distillery Wastewater by Rhodosporidium toruloides
Authors: A. Jiayin  Ling  , B. Saiwa Nip  , C. Renata Alves de Toledo  , D. Hojae Shim
Published: May 2017

For the environmentally sustainable development, the recovery of resource or energy from wastes has attracted worldwide attention in recent years. The wastewater produced from distillery is more difficult to treat than the domestic wastewater due to the high organic loads. This study explores the possibility of developing a process, which could produce microbial lipid convertible to biodiesel by recovering nutrients from non-sterile wastewater while simultaneously removing part of organic matters through cultivating oleaginous microorganisms. Especially, it is intended to further optimize the initial cell density and the usage efficiency of seed culture medium. The lipid productivity by oleaginous yeast Rhodosporidium toruloides was studied using wastewater from rice wine distillery, at 30ºC under different initial cell densities (2 x 107, 1 x 107, 0.8 x 107, and 0.5 x 107 cells/mL) and incubation periods (2-5 days). Chemical oxygen demand (COD) removal efficiency, cell yield, and lipid yield were analyzed and the potential for bioenergy recovery from wastewater was assessed. The seed culture medium was found reusable for the second time without the addition of extra nutrient and possible for the third time with the addition of glucose.
Modelling and simulation of Λ-ridge concentrator system using commercial PV modules
Authors: J. Mroczka  , K. Plachta
Published: May 2017

This paper presents the Λ-ridge and V-trough concentrator system with low concentration ratio applicable in independent power supply systems (e.g. chalets, road signs, traffic lights, street lamps, industrial cameras, CCTV), of an outpower not exceeding 500W. Actual area of photovoltaic modules, which doesn’t exceed 3m2 constitutes important parameter in this kind of construction. Small external dimensions and relatively light weight are the crucial principles of constructing Λ-ridge concentrator system. The performance of the system and the amount of energy produced constitute key factors for such restrictions. A series of simulations was conducted enabling evaluation of the efficiency of the presented systems depending on their technical parameters and weather conditions.
An Effective Wind Speed Observer for Pitch Fault Detection in Wind Turbines
Authors: Y. Vidal  , C. C´ardenas  , L. Acho  , L. Gorostiaga
Published: May 2017

This paper presents a methodology to design an effective wind speed observer using an alternative mathematical representation of the aerodynamic torque of a variable-speed wind turbine. This alternative model is linear in parameters. Then, using this observer, a pitch fault detection scheme is conceived. Numerical experiments using the National Renewable Energy Laboratory wind turbine simulator FAST (Fatigue, Aerodynamics, Structures, and Turbulence) code were performed to support the design.
Operation Analysis of Coordinated Droop Control for Stand-alone DC Micro-grid
Authors: Byung Moon Han  , Hyun Jun Kim
Published: May 2017

This paper introduces a coordinated droop control for the stand-alone DC micro-grid., which is composed of photo voltaic generator, wind power generator, engine generator, and battery storage with SOC (state of charge) management system. The operation of stand-alone DC micro-grid with the coordinated droop control was analyzed with computer simulation. Based on simulation results, a hardware simulator was built and tested to analyze the performance of proposed system. The developed simulation model and hardware simulator can be utilized to design the actual stand-alone DC micro-grid and to analyze its performance. The coordinated droop control can improve the reliability and efficiency of the stand-alone DC micro-grid
Measurements of Complex Harmonic Current on Two Wind turbines
Authors: K. Yang  , M. H. J. Bollen
Published: May 2017

The paper presents measurements of complex harmonic current of two modern wind turbines. The complex current has been obtained with a 5 Hz resolution up to 2.8 kHz. The distribution of complex current has been studied in the complex plane. Distinction has been made between low-order integer harmonics, interharmonics and high-order harmonics: low-order integer harmonics are distributed around a center off set from the origin of the complex plane; interharmonics and high-order harmonics are distributed around the origin with a uniformly distributed phase-angle.
Proposed improvements in wave energy converter of oscillating water column (WEC-OWC)
Authors: R. Borrás-Formoso  , R. Ferreiro-García  , A. De Miguel-Catoira  , F. Miguélez-Pose
Published: April 2017

The aim of this paper is to show some design improvements on converters oscillating water column (OWC) versus conventional OWC, focusing on a newly patented design, OWC with Differential Pressure Storage Tanks (DPST). In this research work, a short review of the principles of operation and the results obtained for each one in relation to energy efficiency and regularity of electricity delivered to the grid are described. Apart some known innovations published so far in scientific journals, it will be discussed in more detail a new design (protected by patent) that tries to overcome some major performance problems in both conventional and improved OWC proposed up today such as intermittent flow through the turbine and the bi-directional flow. It is concluded that there are feasible to implement innovations that can lead to improvements with respect to OWC currently in operation
Contribution of the Losses in the Conductors of an Installation in the Use of Electronic Ballasts in Fluorescent Illumination
Authors: J.A. Lobão  , T. Devezas  , J.P.S. Catalão
Published: April 2017

The global economic and energy situation implies that all contributions for reducing energy consumption are important and relevant in terms of study and investment analysis. In electrical installations, energy consumption can be reduced by reducing losses in the conductors, associated with the use of electronic ballasts in fluorescent illumination, allowing a better use of the energy and of the installed power, which can be an important issue, particularly when using renewable energies. In this sense, this study presents a new software application that compares and chooses the best investment in the acquisition and installation of electronic ballasts in fluorescent illumination
Probabilistic Evaluation Method of Interconnectable Capacity for Wind Power Generation Using Actual Data
Authors: T. Yoshida  , K. Kashima  , M. Kato
Published: April 2017

New analysis method of power quality using stochastic linearization is proposed to evaluate stochastically interconnectable capacity for wind power generation. This is based on mathematical model of load frequency control systems, which involve nonlinear and dynamic characteristics. Nonlinear generator model is linearized to analyse power quality through stochastic linearization. However, accuracy evaluation of model due to linearization has not been examined using actual data. In this paper, we stochastically evaluate accuracy of linearized model and interconnectable capacity for wind power generation.
Operation and Protection of Grid Connected Wind Farm
Authors: M. M.A. Mahfouz  , Mohamed A. El-Sayed
Published: April 2017

In  modern  power  systems,  wind  energy  shares  significant amount   in   electricity   generation.      Accordingly,   the   grid performance could be affected due to the natural behavior of the  connected  wind  farms.      The  main  challenge  is  to  fulfill the  voltage  ride  through  (FRT)  requirements  and  fast  fault detection   as   well   as   reactive   power   coordination   using FACTs    devices    such    as    STATCOM.    Fulfilling    these requirements    will    minimize    the    loss    of    wind    energy generation   due   to   emerged   disconnection   of   the   wind turbines from the grid.  This paper presents fast and efficient over current and under voltage  protections  against  faults  on  both  grid  high  voltage line  and  on  medium  voltage  feeders  connecting  the  wind turbines   to   the   point   of   common   coupling   (PCC).   The proposed  protection  scheme  based  on  measuring  the  voltage and  current  signals  at  PCC  bus,  evaluating  and  analyzing these signals for fault detection. Thereby, the main objective is to keep wind turbines connected to the grid and to regulate the    reactive    power    and    voltage    level    during    grid-transmission  line  faults  using  STATCOM.  Under  voltage, relay time delay settings is proposed to fulfill the Fault Ride-Through  (FRT)  requirement.  Moreover,  over  current  relay settings  is  presented  to  isolate  the  wind  farm  from  the  grid during the internal wind farm feeder faults.
Delivering Energy from PEV batteries: V2G, V2B and V2H approaches
Authors: J. García-Villalobos  , I. Zamora  , J.I. San Martín  , I. Junquera  , P. Eguía
Published: April 2017

Plug-in electric vehicles (PEVs) sales have grown in the last years. Depending on the PEV model, each PEV can store approximately between 5-40 kWh of energy. This energy can be used not only for travel purposes but also for other appliances like providing energy for homes (V2H) or buildings (V2B) and even for supply ancillary services to distribution network operators, through vehicle to grid concept (V2G). This paper presents the different strategies that can be found in the literature about delivering energy from PEV batteries. Also, commercial solutions and pilot projects are presented.