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Sample records for energia utilizando gel

  1. Microgeração de energia eletrica (abaixo de 100kw) utilizando turbina tesla modificada

    OpenAIRE

    Batista, Julio Cesar [UNESP

    2010-01-01

    Este trabalho desenvolve um sistema para gerar energia elétrica com caldeira e turbina, para ocupar um nicho de mercado em que os sistemas a vapor existentes não são economicamente viáveis. O sistema utiliza a turbina Tesla que é compatível para essa faixa e não possui pás, podendo operar com vapor saturado fornecido por uma pequena caldeira consumindo lenha. A micro-geração proposta pode levar energia a milhões de brasileiros no campo, onde se dispõe de algum tipo de biomassa. Apesar do baix...

  2. Desinfecção de agua utilizando energia solar (SODIS)

    OpenAIRE

    Marcelo Jacomini Moreira da Silva

    2004-01-01

    Resumo: A utilização de energia solar como forma de desinfecção de águas, além de ser uma fonte natural disponível é perfeitamente aplicável em regiões menos favorecidas em infraestrutura e recursos financeiros, uma vez que não há necessidade da dosagem de produtos químicos e não há custo já que se podem reutilizar materiais comerciais descartados. O presente trabalho reutilizou garrafas PET, transparentes, com a metade pintada de preto, sendo consideradas como variáveis: tempos de exposição ...

  3. ENERGIA FÓSSIL: implantação de refletores na quadra de esportes, utilizando energia fóssil

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    Alisson Mazzola

    2011-07-01

    Full Text Available O presente projeto consiste na utilização da energia fóssil para aplicar melhorias na quadra desportiva da escola Oswaldo Cruz, localizada na cidade de Sinop/MT.Tais melhorias poderão ser vistas na iluminação, tomadas e acessibilidade. Todavia, isto irá trazer benefícios para toda a sociedade, como acontecimento de eventos esportivos, lúdicos e sua utilização no período noturno.A energia fornecida para a quadra será através de um motor a combustão (gasolina, que será menos poluente, pois os hidrocarbonetos da gasolina poluem menos que do óleo diesel.Assim será produzido 15 horas de iluminação por cada tanque do motor. 

  4. Construção de uma sonda remota para um espectrômetro utilizando detector de NaI(TI) e a fluorescência de raios X por dispersão em energia

    OpenAIRE

    Francisco Antonio Brandao Junior

    2014-01-01

    Este projeto de pesquisa visa a utilização de detectores cilíndricos de NaI(Tl) com variados volumes sensíveis existentes no Laboratório de Instrumentação Nuclear (LIN) do Departamento de Engenharia Nuclear da UFMG (DEN-UFMG) para a montagem de espectrômetros utilizando a técnica de fluorescência de raios por dispersão em energia (EDXRF). Dispositivos de acoplamento em formatos cônicos entre os cristais detectores e a válvula fotomultiplicadora (VFM) foram projetados e construídos utilizando ...

  5. Energy saving in illumination using sensorial presence devices; Ahorro de energia en iluminacion utilizando sensores de presencia

    Energy Technology Data Exchange (ETDEWEB)

    Cortes Eslava, Alejandro [Universidad Nacional Autonoma de Mexico (Mexico)

    2001-03-01

    This is an analysis and evaluation of electrical energy saving that a system of illumination controlled by presence sensors provides in an enclosure with low transit within the Universidad Nacional Autonoma de Mexico (UNAM) that is one of the libraries of the Institute of Anthropological Investigations. The data on which the analysis is sustained and the results deducted come from a time counter located at the site. [Spanish] Este es un analisis y evaluacion de los ahorros de energia electrica que suministra un sistema de iluminacion controlado por sensores de presencia en un recinto con bajo transito dentro de la Universidad Nacional Autonoma de Mexico (UNAM) que es una de las bibliotecas del Instituto de Investigaciones Antropologicas. Los datos de donde se sustenta el analisis y se deducen los resultados provienen de un contador de tiempo de uso localizado en el sitio.

  6. Projeto de lei de controle para piloto automático durante a fase de aproximação utilizando o controle através da energia total.

    OpenAIRE

    Guilherme Maximiliano Verhalem

    2004-01-01

    Este trabalho verifica a eficiência do conceito de um Controle Através da Energia Total quando aplicado no controle de trajetória e velocidade de uma aeronave que está na fase de aproximação. Para isto, foi projetado um controlador de um piloto automático utilizando este conceito para uma aeronave durante uma aproximação por instrumentos. Este controlador mostra-se eficiente neste caso, porque se trata de um controle MIMO (Multiple Input-Multiple Output), que atua em ambas entradas de forma i...

  7. ANÁLISE QUANTITATIVA DE AMOSTRAS GEOLÓGICAS UTILIZANDO A TÉCNICA DE FLUORESCÊNCIA DE RAIOS X POR DISPERSÃO DE ENERGIA

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    CARNEIRO A. E. V

    1996-01-01

    Full Text Available Este trabalho propõe uma metodologia para análise quantitativa de amostras geológicas, que apresentam uma considerável fração de elementos leves (número atômico Z < 13, utilizando a técnica de fluorescência de raios X por dispersão de energia, com excitação radioisotópica. O procedimento proposto baseia-se no método dos Parâmetros Fundamentais para a quantificação dos elementos analíticos (Z ³ 13 e na radiação de excitação espalhada coerente e incoerentemente para a quantificação da fração leve da matriz (Z < 13. Neste método, a relação entre a intensidade fluorescente e a concentração elementar foi estimada através da sensibilidade elementar e fator de geometria para a fluorescência, determinados com auxílio de amostras padrão confeccionadas com elementos puros e compostos simples, de densidade superficial e composição conhecidas. A relação entre as intensidades espalhadas e a fração leve da matriz foi estabelecida com base nos fatores de geometria, nos fatores de espalhamento e nas seções de choque diferenciais. Para a produção dos raios X característicos dos elementos Mn ao Zr foi utilizada uma fonte radioativa anelar de Cd-109 (1,70 GBq e para os elementos Al ao Cr, uma de Fe-55 (0,74 GBq. Para a detecção dos raios X foi utilizado um detector de Si(Li acoplado a um analisador multicanal. As intensidades líquidas dos raios X característicos, e as intensidades espalhadas de modo coerente e incoerente foram obtidas utilizando um programa aplicativo de ajuste de espectro, denominado AXIL (Espen et al., 1977 e 1979. A metodologia foi testada analisando-se os padrões certificados, Soil-5/AIEA, SL-2/AIEA, SARM-2/SABS, SARM-3/SABS, SARM-4/SABS e SARM-6/SABS, diluídos com ácido bórico na proporção 1:4, obtendose pastilhas com densidade superficial de aproximadamente 100 mg.cm - 2. O método proposto mostrou boa reprodutibilidade, com coeficiente de variação em geral inferiores a 10%. Quanto

  8. Ferramenta de auxílio no processo de medição de energia elétrica utilizando inteligência computacional

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    Marco Antônio Silva Pereira

    2015-06-01

    Full Text Available Este artigo aborda assuntos relacionados aos problemas encontrados na medição de energia elétrica em decorrência de distorções harmônicas da rede. Tais distorções podem ser capazes de provocar erros consideráveis, acarretando, consequentemente, em cobrança de uma quantidade indevida de energia pela empresa fornecedora. Tendo em vista esse problema, o objetivo deste artigo consiste em tornar o processo de medição de energia elétrica mais eficiente por meio de conceitos referentes a Redes Neurais Artificias e Redes Neuro-Fuzzy.Palavras-chave: Medição de energia elétrica. Distorções Harmônicas. Redes Neurais Artificiais. Redes Neuro-Fuzzy.AbstractA tool to assist in the process of electric energy measurement by the use of computational intelligenceThis article discusses issues related to problems encountered on electrical energy measurement due to harmonics distortions in the network. Such distortions may be able to cause considerable errors and consequently an undue amount of energy collection by the supplier. In view of this problem, the objective of this article is to make the process of measuring more efficient electricity through concepts related to Artificial Neural Networks and Neuro-Fuzzy Networks.Keywords: Electrical energy measurement. Harmonic Distortions. Artificial Neural Networks. Neuro-Fuzzy Networks.

  9. UTILIZAÇÃO DE UM SISTEMA PARA A REDUÇÃO DO ÁCIDO CIANÍDRICO PRESENTE NA MANIPUEIRA UTILIZANDO ENERGIA SOLAR

    OpenAIRE

    Rebouças, Cyrus Santos; de Freitas, Andrea Gonçalves Bueno; Universidade Federal de Sergipe; Bery, Carla Crislan de Souza; Universidade Federal de Sergipe; da Silva, Isabelly Pereira; Universidade Federal de Sergipe; Oliveira Júnior, Antônio Martins de; Universidade Federal de Sergipe- UFS; da Silva, Gabriel Francisco; Universidade Federal de Sergipe-UFS

    2015-01-01

    O objetivo deste trabalho é avaliar a cinética de remoção do ácido cianídrico (HCN) presente na manipueira, coletada de casas de farinhas do estado de Sergipe, utilizando como meio de remoção do mesmo um sistema solar, conhecido como concentrador solar do tipo linear, de seção parabólica, cilíndrico e articulado em apenas um eixo.

  10. Obtenção dos fluxos de energia à superfície utilizando o algoritmo S-SEBI Surface energy fluxes estimative using the S-SEBI algorithm

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    Carlos Antonio Costa dos Santos

    2010-09-01

    Full Text Available O principal objetivo desse estudo foi contribuir para a compreensão das estimativas e análises espaciais dos fluxos de energia à superfície, utilizando o algoritmo S-SEBI e imagens Landsat 5 - TM, assim como, validar os resultados com medidas obtidas na torre micrometeorológica. A área de estudo foi a fazenda Frutacor, com área plantada com cultivos de bananeiras e áreas adjacentes com solo exposto e vegetação nativa. A referida área fica localizada no município de Quixeré, na microrregião do Baixo Jaguaribe, Estado do Ceará. O algoritmo S-SEBI apresentou-se como um bom estimador dos fluxos de energia à superfície, apresentando concordância com estudos desenvolvidos em diferentes partes do mundo. A comparação dos resultados estimados pelo S-SEBI com os medidos na torre micrometeorológica mostrou que os parâmetros, estimados pelo referido algoritmo, estão em boa concordância com os medidos, evidenciando assim, que o S-SEBI é uma ferramenta promissora na obtenção da distribuição espacial dos fluxos de energia à superfície em regiões semi-áridas.The main objective of this study was to contribute to the understanding of the estimates and spatial analyses of the surface energy fluxes using the S-SEBI algorithm and TM Landsat 5 images, and to validate the measurements obtained at the micrometeorological tower. The study area was the Frutacor farm, with cultivated area of banana crops, adjacent to bare soil and native vegetation areas, located at the irrigation district of Quixeré, in the Low Jaguaribe basin, Ceará State. The S-SEBI algorithm seems to be a good estimator of the surface energy fluxes in agreement to different studies developed throughout the world. The comparison between the S-SEBI and the micrometeorological results showed good agreement, evidencing that the S-SEBI algorithm is a promising tool in obtaining the spatial distribution of the surface energy fluxes over semi-arid regions.

  11. Evaluation of the energy saving potential in illumination using presence sensors; Evaluacion del potencial de ahorro de energia en iluminacion utilizando sensores de presencia

    Energy Technology Data Exchange (ETDEWEB)

    Cortes Eslava, Alejandro [Universidad Nacional Autonoma de Mexico (UNAM), Mexico, D. F. (Mexico)

    1999-07-01

    The analysis and the evaluation of the energy saving that would provide a system of illumination controlled by sensors of presence in an enclosure with low transit, evaluating the economic profitability of the system is presented. The data, from which the analysis is sustained and the results are deducted, coming from the use and installation of a timer in the area. [Spanish] Se presenta el analisis y la evaluacion de los ahorros de energia que suministraria un sistema de iluminacion controlado por sensores de presencia en un recinto con bajo transito, evaluando la rentabilidad economica del sistema. Los datos, a partir de los cuales se sustenta el analisis y se deducen los resultados, provienen de la utilizacion e instalacion de un contador de tiempo de uso en el recinto.

  12. Classificação de eventos em redes de distribuição de energia elétrica utilizando modelos neurais autônomos

    OpenAIRE

    Lazzaretti, André Eugênio

    2015-01-01

    Este trabalho apresenta uma metodologia para classificação de eventos de curto-circuito e mano-bras em redes de distribuição de energia elétrica, com base nos registros oscilográficos de tensão na barra da subestação de distribuição. São apresentados os resultados obtidos para duas formas distintas de pré-processamento dos sinais de tensão, sendo a primeira baseada em Transformada de Fourier e a segunda em Transformada Wavelet para diferentes famílias de funções wavelet. Foram comparados três...

  13. A new methodology for sizing hybrid photovoltaic-wind energy system using simulation and optimization tools = Uma nova metodologia para dimensionamento de sistemas híbridos de energia (solar-eólica utilizando ferramentas de simulação e otimização

    Directory of Open Access Journals (Sweden)

    Samuel Nelson Melegari de Souza

    2005-01-01

    Full Text Available This paper presents a new methodology for sizing an autonomousphotovoltaic-wind hybrid energy system with battery storage, using simulation and optimization tools. The developed model is useful for energizing remote rural areas and produces a system with minimum cost and high reliability, based on the concept of Loss of Power Supply Probability (LPSP applied for consecutive hours. Some scenarios arecalculated and compared, using different numbers of consecutive hours and different LPSP values. As a result, a complete sizing of the system and a long-term cost evaluation are presented.Este trabalho apresenta uma nova metodologia para dimensionamento de sistemas híbridos de energia (solar-eólica com armazenamento em banco de baterias, utilizando ferramentas de simulação e otimização. O modelo desenvolvido é útil para a energização de áreas ruraisisoladas e resulta num sistema com custo mínimo e alta confiabilidade, baseado no conceito de perda de fornecimento de energia à carga (LPSP aplicado para horas consecutivas. Alguns cenários são calculados e comparados, utilizando-se diferentes períodos de horas consecutivas e diferentes valores de LPSP. Os resultados apresentam um dimensionamento completo do sistema e uma avaliação de custos ao longo de vários anos.

  14. Scenarios simulation for the conservation and efficient use of energy, using passive control measures; Simulacion de escenarios de ahorro y uso eficiente de energia, utilizando medidas de control pasivo

    Energy Technology Data Exchange (ETDEWEB)

    Ramos, G.; Heard, Ch.; Sanchez Viveros, A. [Instituto de Investigaciones Electricas,Cuernavaca (Mexico)

    1997-12-31

    Every one involved with the conservation and efficient use of electric energy, has listened in reiterative occasions to the causes that changed the conventional mentality at the beginning of the seventies. Nevertheless, there are many persons that still ignore that by using the energy rationally, their costs are significantly reduced, their comfort is enhanced and the environmental problems are minimized. Specifically, in the domestic sector, from the figures reported by the Comision Federal de Electricidad (CFE) in 1996, the electric energy sold was 28,410 Gwh, that is, 23.4% of the total consumption (121,579 Gwh). Table 1 presents the average by tariff in the national domestic sector, which shows that 20% of the electricity consumed was required for environmental conditioning (air conditioning, evaporative coolers and electric fans). The above figures quantitatively show that there is a strong impact in the consumption of electric energy due to weather conditions. For this reason, currently the Comision Nacional de Ahorro de Energia (CONAE) and the Fideicomiso para el Ahorro de Energia (FIDE) are promoting standards and projects to propitiate the rationalization in the use of energy, besides of achieving the improvement of thermal comfort conditions. One more case would be the Fideicomiso para el Aislamiento Termico de la Vivienda en Mexicali (FIPATERM), which promotes the financing of saving measures and efficient energy use in cities with extreme climate. This paper describes the strategy that was followed by the Instituto de Investigaciones Electricas (IIE), for the development of the human and material infrastructure, that has allowed the sustainment of several projects in the saving and efficient use of energy in CFE, CONAE, FIDE, FIPATERM and the Lawrence Berkeley National Laboratory (LBNL), concretely in relationship with the thermal analysis of dwellings. [Espanol] Todos aquellos relacionados con el ahorro y el uso eficiente de la energia electrica, han

  15. Caracterização de cepas de referência de Leptospira sp utilizando a técnica de pulsed field gel electrophoresis Characterization of Leptospira sp reference strains using the pulsed field gel electrophoresis technique

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    Lívia Machry

    2010-04-01

    Full Text Available INTRODUÇÃO: A leptospirose é uma zoonose endêmica, mundialmente distribuída, causada por bactérias do gênero Leptospira. Este gênero compreende espécies patogênicas e saprofíticas, com mais de 200 sorovares distintos, dificultando sua caracterização. A técnica de pulsed field gel electrophoresis tem sido empregada como uma ferramenta para auxiliar nesta caracterização. Os objetivos deste trabalho foram padronizar a técnica de PFGE, determinar os perfis moleculares das cepas de referência utilizadas pelo Laboratório de Referência Nacional para Leptospirose/Centro Colaborador da Organização Mundial de Saúde para Leptospirose e criar um banco de dados com estes perfis. MÉTODOS: Foram analisadas, por PFGE, dezenove cepas utilizando a enzima de restrição NotI. RESULTADOS: Cada cepa apresentou um perfil único que pode ser considerado como uma identidade genômica específica, com exceção dos sorovares Icterohaemorrhagiae e Copenhageni, cujos perfis foram indistinguíveis. CONCLUSÕES: Dessa forma, foi possível a criação de um banco de perfis moleculares que está sendo utilizado no Laboratório para a comparação e identificação de cepas isoladas de quadros clínicos.INTRODUCTION: Leptospirosis is an endemic zoonosis of worldwide distribution, caused by bacteria of the genus Leptospira. This genus includes pathogenic and saprophytic species, with more than 200 different serovars, thus making it difficult to characterize. The technique of pulsed field gel electrophoresis has been used as a tool to aid in this characterization. The aims of this study were to standardize the PFGE technique, determine the molecular profiles of reference strains used at the National Reference Laboratory for Leptospirosis/World Health Organization Collaborating Center for Leptospirosis and create a database with these profiles. METHODS: Nineteen strains were analyzed by means of PFGE, using the restriction enzyme NotI. RESULTS: Each strain

  16. Análise de um sistema de aquecimento de água para residências rurais, utilizando energia solar A water heating system analysis for rural residences, using solar energy

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    Luiz H. Basso

    2010-02-01

    Full Text Available A conscientização da importância do meio ambiente tem incentivado o estudo de novas fontes energéticas renováveis e menos poluentes. Dentre essas fontes, a energia solar destaca-se por ser perene e limpa. A utilização da energia solar em sistemas de aquecimento de água residencial rural pode colaborar com a economia de energia elétrica, base da matriz energética brasileira. Conhecer os fatores que influenciam na operação de um sistema de aquecimento de água por energia solar é importante na determinação de sua viabilidade técnica, visando a sua difusão em residências rurais. Para tanto, construiu-se um protótipo, no câmpus da Faculdade Assis Gurgacz, em Cascavel - PR, com características similares a um equipamento utilizado em residências para dois habitantes, para funcionar com circulação natural ou termossifão e sem auxílio de sistema de aquecimento complementar. O equipamento mostrou-se viável tecnicamente, alcançando a temperatura mínima para banho de 35 °C, sempre que a radiação solar foi superior a 3.500 Wh m-2, o que aconteceu para a maioria dos dias estudados.The awareness of the importance of the environment has stimulated the study of new renewed energy sources and less pollutant. Amongst these sources, solar energy stands alone for being perennial and clean. The use of solar energy in systems of agricultural residential water heating, can complement the economy of electric energy, base of the Brazilian energy matrix. Knowing the factors that influence the operation of a system of water heating by solar energy is important in determining their technical viabilities targeting their distribution in agricultural residences. To evaluate equipment of water heating for solar energy, a prototype was constructed in the campus of Assis Gurgacz College, in Cascavel,State of Paraná, Brazil, with similar characteristics to equipment used in residences for two inhabitants, to function with natural circulation or

  17. Formulação de ração para frangos de corte de crescimento lento utilizando valores de energia metabolizável dos ingredientes determinada com linhagens de crescimento lento e rápido

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    F.R. Santos

    2014-12-01

    Full Text Available Com este trabalho, objetivou-se avaliar o efeito da formulação de rações para frangos de corte de crescimento lento, com a utilização de valores de energia metabolizável (EMAn dos alimentos determinados por linhagens de crescimento rápido e lento, sobre o desempenho, características de carcaça, biometria de órgãos digestórios e valores energéticos das rações experimentais. Utilizaram-se 72 pintos de um dia, machos, da linhagem Isa Label, distribuídos em delineamento de blocos ao acaso, com dois tratamentos (energia dos alimentos e seis repetições de seis animais cada. As médias foram comparadas pelo teste de Tukey a 5% de probabilidade. Os tratamentos consistiram na formulação de rações baseadas na energia do milho e no farelo de soja determinados com frangos Cobb (EMAn Cobb e Isa Label (EMAn Isa Label. O experimento foi conduzido na fase inicial, e as aves consumiram as dietas por 28 dias. A formulação da dieta baseada na EMAn Cobb e Isa Label não afetou o desempenho, a biometria de órgãos digestórios e as características de carcaça de aves de crescimento lento. Porém, a dieta formulada com a EMAn Isa Label resultou em melhor conversão calórica e menor deposição de gordura abdominal na carcaça das aves. EMAn da ração semelhante ao nível calculado foi determinada com a formulação baseada na EMAn do milho e do farelo de soja determinada com a linhagem Isa Label (2.750 x 2.728 kcal/kg. Os valores de EMAn do milho e do farelo de soja determinados com aves Isa Label não afetam o desempenho dos frangos de crescimento lento, porém resultam em menor gordura abdominal, atendendo aos anseios dos consumidores de aves alternativas.

  18. Consumo e digestibilidade total e parcial de dietas utilizando farelo de girassol e três fontes de energia em novilhos confinados Intake, total and partial digestibility of diets with sunflower meal and three energy sources in confined steers

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    Ana Rosália Mendes

    2005-04-01

    Full Text Available Avaliaram-se o consumo alimentar, a digestibilidade parcial e total e o balanço de nitrogênio, em novilhos confinados. Foram utilizados três novilhos de corte cruzados, canulados no rúmen e no duodeno, distribuídos em dois delineamentos em quadrado latino 3 x 3. As dietas experimentais foram constituídas de 60% de silagem de milho, tendo como fonte de proteína o farelo de girassol e, como fonte de energia, o milho (MI. O milho foi substituído parcialmente pela casca de soja (CS ou pelo farelo de gérmen de milho (FGM. Quatro indicadores internos (lignina e FDA, FDN e lignina indigestíveis foram submetidos a 144 horas de digestão in vitro, para estimativa da digestibilidade parcial e total das dietas. Houve maior ingestão dos componentes fibrosos na dieta CS, porém não foi observado efeito sobre o consumo de matéria seca. A lignina subestimou significativamente a digestibilidade. A utilização da FDAi, FDNi e lignina-i para estimar a digestibilidade total é viável, no entanto, a FDAi e lignina-i não estimaram adequadamente as digestibilidades parciais. Houve efeito significativo na digestibilidade ruminal da FDA, com valores mais elevados para CS e semelhantes para FGM, em relação à dieta MI. A digestibilidade total da FDA foi maior na dieta CS, porém, as digestibilidades dos demais componentes não foram afetadas pelas diferentes fontes energéticas. Não houve diferença significativa para a digestibilidade da energia e nos valores obtidos de NDT, com média de 61,5%. A casca de soja e o farelo de gérmen de milho, em substituição parcial do milho, mostraram-se fontes alternativas satisfatórias para a inclusão na dieta de bovinos.Feed intake, partial and total digestibility and nitrogen balance were evaluated in confined steers. Three crossbreed steers, rumen and duodenum cannulated, were allotted to two 3 x 3 Latin square experimental design. The experimental diets were composed by corn silage (60% and concentrate

  19. Determinação de diagramas de bandas de energia e da borda de absorção em SnO2, depositado via sol-gel, sobre quartzo Determination of the band energy diagram and absorption fundamental edge in SnO2, deposited via sol-gel, on quartz

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    E. A. Floriano

    2009-03-01

    Full Text Available Propriedades ópticas e estruturais de filmes finos de SnO2, depositados sobre substratos de quartzo, são apresentadas. Os filmes são preparados pela técnica de molhamento via sol-gel. Uma avaliação das propriedades eletrônicas do cristal (bulk e das superfícies (110 e (101 do material é também efetuada, através de cálculos baseados em um método mecânico-quântico que utiliza a Teoria do Funcional da Densidade (DFT em conjunto com o funcional hibrido B3LYP. A borda fundamental de absorção, obtida experimentalmente, é então comparada com os diagramas de bandas de energia do bulk e superfícies (110 e (101, calculadas.Optical and structural properties of SnO2 thin films, deposited on quartz substrates, are presented. Films are prepared by the sol-gel-dip-coating technique. An evaluation of the electronic properties of bulk and surfaces (110 and (101 of the material is also carried out, through calculation based on a quantum-mechanical method using the Density Functional Theory (DFT in conjunction with the hybrid functional B3LYP. The absorption fundamental edge, experimentally obtained, is compared to the calculated band energy diagram of bulk and surfaces (110 and (101.

  20. Estimativas das Exigências de Lisina e de Energia Metabolizável em Frangos de Corte de 1 a 21 dias de Idade, Utilizando-se uma Variável Multivariada Canônica

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    Bellaver Claudio

    2002-01-01

    Full Text Available Foi conduzido um experimento com o objetivo de avaliar os efeitos da lisina metabolizável (LM e da energia metabolizável (EM sobre variáveis uni e multivariada de desempenho e deposição de tecidos na carcaça de frangos de corte, mantendo-se as dietas equilibradas com base no conceito de proteína ideal. Foram utilizados 2808 pintos machos de linhagem comercial, com início no 1º dia e final com 21 dias de idade, distribuídos em 104 boxes. Os tratamentos foram resultantes de um fatorial de três níveis (3.000, 3.100 e 3.200 kcal/kg de EM e quatro níveis (0,92, 1,02, 1,12 e 1,22% de LM, mais um tratamento com as exigências supridas por aminoácidos totais. Foram utilizadas oito repetições em cada tratamento, sendo blocadas por peso inicial. As dietas foram baseadas em milho e farelo de soja e aminoácidos cristalinos. As variáveis em estudo foram baseadas em desempenho, deposição de tecidos e pela variável multivariada canônica (CAN, criada a partir das variáveis primárias: ganho de peso, consumo de ração e deposição de proteína na carcaça. Houve efeito significativo da LM, EM e suas interações sobre o desempenho, deposição de tecidos e CAN. Pelo método da linha quebrada, a variável CAN permitiu estimar a exigência de LM em 1,18% na dieta com 3.000 kcal de EM/kg. Nesse trabalho, entre os modelos estudados o linear foi melhor para estimar a exigência de 1,22% de LM, quando as dietas contêm 3.100 ou 3.200 kcal de EM/kg, não sendo alcançado o ponto ótimo que poderá ser superior ao encontrado.

  1. Dosimetric characterization of VIPARnd gel by optical analysis to high-energy photon beam used in external radiotherapy; Caracterizacao dosimetrica de gel tipo VIPARnd atraves de analise optica para feixes de fotons de alta energia usado em radioterapia externa

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Juliana R.; Lima, Renata S.; Lopes, Roseany de V. Vieira; Ceschin, Artemis Marti, E-mail: juliana_rdias@yahoo.com.br [Universidade de Brasilia (UnB), Brasilia, DF (Brazil)

    2015-07-01

    Polymer gel dosimetry has been proposed as a possibility for measurements of dose distribution in radiotherapy. This work aims to evaluate the dosimetric characteristics of a VIPARnd for 6 MV photon beam used in radiotherapy using optical investigations. The absorbance spectrum of irradiated gel dosimeter was optical evaluated with spectrophotometer techniques and with CMOS camera readout for dose range of 0 to 50 Gy. Data shows that the VIPARnd has a maximum absorbance at 300 to 320 nm depending on the absorbed dose. The CMOS camera readouts were obtained in RGB color, the absorbance measurements suggest a major response of dose for blue matrix verified with data. The dose-response curve for blue component showed interval of linearity from 1 Gy to 20 Gy. (author)

  2. Síntese de membranas cerâmicas via método sol-gel utilizando TEOS e N,N-dimetilformamida

    Directory of Open Access Journals (Sweden)

    Lenza Rúbia Francisca Silva

    2002-01-01

    Full Text Available In this work we obtained microporous and mesoporous silica membranes by sol-gel processing. Tetraethylortosilicate (TEOS was used as precursor. Nitric acid was used as catalyst. In order to study the affect of N,N-dimethylformamide (NDF as drying additive, we used a molar ratio TEOS/NDF of 1/3. The performance of N,N-dimethylformamide was evaluated through monolithicity measurements. The structural evolutions occurring during the sol-gel transition and in the interconnected network of the membranes during thermal treatment were monitored by Fourier transform infrared spectroscopy (FTIR, thermogravimetric analyses and nitrogen sorption. We noted that in the presence of N,N-dimethylformamide, polymerization goes through a temporary stabilization of oligomers. The Si-O(H bonds are stronger and belong to a more cross-linked structure for the N,N-dimethylformamide containing sol. The membranes obtained in the presence of N,N-dimethylformamide have larger surface area and its pore structure is in the range of mesoporous. The membranes obtained without additive have pore structure in the range of microporous.

  3. Study on vinasse dynamics in soil usin energy dispersive X-ray fluorescence with radioisotopic excitation Estudo da dinâmica da vinhaça em solo utilizando a fluorescência de raios x por dispersão de energia com excitação radioisotópica

    Directory of Open Access Journals (Sweden)

    S.M. Simabuco

    1994-08-01

    Full Text Available The distribution of S, Cl, K and Ca along the profiles of two soils of different texture (Red Yellow Podzolic and Dark Red Latosol treated with amounts of vinasse equivalent to 4000 m³/ha were studied using energy dispersive X-ray fluorescence, observing a significant increase in the contents of these elements. The same effect was observed for Cu, Zn, Rb and Sr contents in soils treated with vinasse as compared to the control. The concentrations of Al, Si, Ti, Mn, Fe and Zr could also be evaluated but no significant variation was observed due to the high soil initial concentrations of these elements as compared to the low concentrations in the vinasse. Annular radioactive sources of Fe-55 and Cd-109 were employed for the excitation of these elements in the soil samples, treated or not with vinassse. For the detection of the characteristic X-rays, a Si (Li semiconductor detector was used, coupled to a multichannel emulation card inserted in a microcomputer.A distribuição de S, Cl, K e Ca ao longo de perfis de dois solos de diferentes texturas (Podzólico Vermelho Amarelo e Latossolo Vermelho Escuro, tratados com uma dose de vinhaça equivalente a 4000 m³/ha, foi estudada utilizando a fluorescência de raios X por dispersão de energia, observando-se um acréscimo significativo dos teores destes elementos. O mesmo efeito foi observado nos teores de Cu, Zn, Rb e Sr nos solos tratados com vinhaça em relação às testemunhas. As concentrações de Al, Si, Ti, Mn, Fe e Zr também puderam ser avaliadas, mas não houve variação nos perfis, devido à alta concentração inicial nos solos acompanhada de baixa concentração na vinhaça. Na excitação dos elementos presentes nas amostras de solo tratados ou não com vinhaça foram empregadas fontes radioativas anelares de Fe-55 e Cd-109, e na detecção dos raios X característicos um detector semicondutor de Si (Li, acoplado a uma placa analisadora de pulsos multicanal, inserida em um

  4. Modelos para estimar as exigências de energia metabolizável para poedeiras

    OpenAIRE

    Sakomura,Nilva Kazue; Basaglia,Roberta; Sá-Fortes,Cristina M. L.; Fernandes,João Batista K.

    2005-01-01

    Objetivou-se, com este trabalho, elaborar um modelo para estimar as exigências de energia metabolizável (EM) para poedeiras leves da linhagem Lohmann LSL, utilizando-se o método fatorial. Para determinar o efeito da temperatura sobre as exigências de EM para mantença, foram conduzidos experimentos em câmaras climáticas com temperaturas constantes de 12, 22 e 31ºC, utilizando a técnica do abate comparativo. A exigência de energia líquida para o ganho de peso foi determinada por meio da regress...

  5. Energia dos grafos

    OpenAIRE

    Collao Morales, Macarena Alessandra

    2014-01-01

    Uma das aplicações mais importantes da Teoria Espetral dos Grafos na área da Química está relacionada com a correspondência muito estreita existente entre a energia _ electron de uma molécula e os valores próprios do grafo que a representa. Esta correspondência por si só é motivação suficiente para o estudo da energia dos grafos. Nesta dissertação, para além de se introduzirem os conceitos e terminologia básicos da Teoria dos Grafos necessários para o estudo da energia (que se define como se...

  6. Mis on Roheline Energia? / Kadi Laid

    Index Scriptorium Estoniae

    Laid, Kadi, 1976-

    2004-01-01

    Tuule- ja vee-energia kasutamisest Rohelise Energia osalussüsteemiga liitunud kuues Hiiumaa ettevõttes ning Kärdla linnavalitsuses. Kommenteerivad Toomas Jõõts, Ari Hannula ja Ants Vahtras. Lisa: Rohelise energia ostjad Hiiumaal praegu

  7. Projeto de pesquisa Energia Nuclear

    Directory of Open Access Journals (Sweden)

    Marcelo Henrique Barbosa Fiori

    2011-07-01

    Full Text Available Esse  projeto tem como intuito mostrar como pode se útil a utilização da energia nuclear para o abastecimento elétrico de uma escola. Mostrando que a energia nuclear é sim uma fonte viável de produção de energia “[...] meio quilo de urânio, do tamanho da ponta do meu dedo se você conseguir liberar toda a energia equivale a 5.000 barris de petróleo”.

  8. Eesti Energia unustas Toomas Lumani andmed / Raimo Poom

    Index Scriptorium Estoniae

    Poom, Raimo

    2008-01-01

    Eesti Energia jurist Heili Raudkivi palus rahandusministeeriumilt infot, mis tähtajaks on rahandusminister nimetanud Eesti Energia nõukogu liikmeks Toomas Lumani. Eesti Energia pressiesindaja selgitus

  9. Uusiutuva energia sijoituskohteena

    OpenAIRE

    Silvennoinen, Kiti; Vihonen, Niko

    2013-01-01

    Globaalit tavoitteet ilmastonmuutoksen hillitsemiseksi ovat johtaneet energiamarkkinoiden muutokseen. Perinteisten kivihiilen ja öljyn rinnalle on kehitetty erilaisia uusiutuvia energia-muotoja, joiden tuottaminen aiheuttaa vähemmän ympäristölle haitallisia päästöjä. Kansainväliset sopimukset ja säädökset tukevat energiantuotannon siirtymistä uusituvilla energialähteillä tuotettuun energiaan. Suomi on osaltaan sitoutunut näihin kansainvälisiin sopimuksiin ja lisäksi asettanut itselleen tavoit...

  10. Eesti Energia esindused = Eesti Energia branches / Andres Labi, Janno Roos

    Index Scriptorium Estoniae

    Labi, Andres, 1977-

    2013-01-01

    Eesti Energia klienditeeninduse kontorite sisekujundusest. Autorid: Janno Roos, Andres Labi ja Liisa Põime (Ruumilabor). Visuaalne identiteet: Tank.Teenuste disain: Urmas Pastarus. ESLi aastapreemiate žürii esimehe Kaido Kivi ning žürii liikme Raivo Puusepa arvamused

  11. Cálculo dos níveis de energia do átomo de hidrogênio sob a ação de um campo magnético externo utilizando a equação de Hamilton-Jacobi relativística

    OpenAIRE

    Silva, Gesiel Gomes

    2014-01-01

    Nosso trabalho consistiu em encontrar os níveis de energia do átomo de hidrogênio sob a ação de um campo magnético externo constante. Utilizamos o formalismo de Hamilton-Jacobi relativístico para introduzir o campo magnético e para obter uma equação para o átomo de hidrogênio sob a ação de um campo magnético uniforme. Propusemos também uma função, com base em uma expansão polinomial, como solução da equação obtida a partir do formalismo de Hamilton-Jacobi possibilitando assim a solução numér...

  12. Energia Geotérmica

    Directory of Open Access Journals (Sweden)

    Gabriel Del Santoro Bressan

    2011-07-01

    Full Text Available Quando o assunto é energia renovável, a energia geotérmica proveniente do calor do interior da terra se mostra como uma forte candidata para acabar com os diversos problemas gerados por milhares de usinas elétricas espalhadas pelo mundo, entre elas, as inundações de rios provocadas pelas usinas hidrelétricas ou então os gases lançados na atmosfera pelas usinas termelétricas que contribuem para o efeito estufa. “A usina geotérmica tem o maior potencial de fornecimento de energia renovável para o mundo todo, nesse ritmo, as usinas elétricas poluidoras podem virar coisa do passado.” (O PODER da Energia Geotérmica, 2011. O presente estudo foca na construção de uma pequena usina geotérmica localizada nas proximidades da escola Osvaldo Cruz na cidade de Sinop no estado do Mato Grosso, para o abastecimento do refeitório da escola com o intuito de reduzir custos e preservar o meio ambiente. A finalidade principal do projeto é fazer com que o público alvo desta pesquisa, ou seja, o corpo docente, discente e funcionários da instituição usufruam de uma energia limpa, autossustentável, barata e com mínimos impactos ao meio ambiente.

  13. Comparative study on systems of residual water treatment in the process industry by evaporation, using fossils fuels or solar energy; Estudio comparativo sobre sistemas de tratamiento de aguas residuales de la industria de procesamiento por evaporacion, utilizando combustibles fosiles o energia solar

    Energy Technology Data Exchange (ETDEWEB)

    Landgrave Romero, Julio; Canseco Contreras, Jose [Facultad de Quimica, UNAM (Mexico)

    1996-07-01

    The residual water treatment of the process industry, nowadays is an imminent necessity in our country. In the present study two different forms are considered to concentrate residual waters: multiple effect evaporation and solar evaporation. The use of solar evaporation lagoons is a good possibility to conserving energy by means of the diminution of fossil fuel consumption. The design basis of the evaporation systems via multiple effect, as well as solar evaporation, the results of the respective sizing and the estimation of the corresponding costs are presented. A practical case is described on the cooking of cotton linters (flock) [Spanish] El tratamiento de aguas residuales de la industria de proceso, hoy en dia es una necesidad inminente en nuestro pais. En el presente trabajo se consideran dos formas distintas para concentrar las aguas residuales: evaporacion de multiple efecto y evaporacion solar. El empleo de lagunas de evaporacion solar es una buena posibilidad para conseguir el ahorro de energia mediante disminucion del consumo de combustibles fosiles. Se presentan las bases de diseno de los sistemas de evaporacion via multiple efecto, asi como solar, los resultados del dimensionamiento respectivo y la estimacion de los costos correspondientes. Se describe un caso practico sobre el cocido de linters de algodon (borra)

  14. Análise teórica da recuperação de calor para geração de energia em indústrias de cimento e cal utilizando o ciclo de Rankine orgânico

    Directory of Open Access Journals (Sweden)

    Ricardo Carrasco Carpio

    2015-06-01

    Full Text Available O presente trabalho consiste em uma apresentação do estado da arte do Ciclo Rankine Orgânico, um ciclo termodinâmico que usa um fluido orgânico como fluido de trabalho e que pode ser usado para recuperação de calor rejeitado em processos industriais, gerando assim energia elétrica para abastecer a própria indústria, o que consequentemente causa uma redução no custo de produção da empresa. São apresentados alguns fluidos orgânicos e alguns de seus parâmetros termodinâmicos.Palavras-chave: Cogeração. Ciclo Rankine Orgânico. Fluidos de Trabalho.ABSTRACTTheoretical analysis of heat recovery for power generation in cement and lime industries using the organic Rankine cycleThis work aims to present the state of the art of the Organic Rankine Cycle, a thermodynamic cycle that uses an organic fluid as a working fluid that can be used to recover the rejected heat in industrial processes, thus generating electricity to supply industry itself, which causes a reduction in the production cost of the company. It also presents some organic fluids and some of their thermodynamic parameters.Keywords: Cogeneration. Organic Rankine Cycle. Working Fluids.

  15. Influência da forma e do processo de obtenção do entalhe na carga máxima e na energia de fratura de argamassas utilizando o método da cunha para propagação estável de trinca Influence of notch shape and preparation on the maximum load and fracture energy of mortars evaluated by the wedge splitting method for stable crack propagation

    Directory of Open Access Journals (Sweden)

    S. Ribeiro

    2009-06-01

    Full Text Available Este trabalho mostra a influência da forma e do processo de obtenção do entalhe na estabilidade da propagação de trinca em materiais cerâmicos de microestrutura heterogênea e conseqüentemente, na carga máxima e energia de fratura quando esses materiais são submetidos ao carregamento utilizando o método da cunha. Foram preparadas argamassas com cimento Portland, areia e água, que foram moldadas, curadas a 25 ºC por 7 dias e secadas a 50 ºC por 48 h. Foram estudadas duas proporções (dosagens ou traços de areia:cimento de 3:1 e 2:1. Foram testados dois tipos de entalhe: um com perfil quadrado da ponta e outro em "V" com ângulo de 60º. Os entalhes de formato quadrado foram obtidos de duas formas: produzidos mecanicamente a partir de disco diamantado e outro na própria moldagem das amostras. Para produzir as amostras entalhadas e ranhuradas já na moldagem, foi desenvolvido um molde de PVC munido de lâminas de aço internas. A partir dos testes preliminares foram estabelecidas as condições de propagação estável da trinca. A trinca percorre um plano imaginário definido pelas ranhuras laterais da amostra. Os resultados mostraram que o entalhe que proporciona melhores condições de estabilidade de propagação de trinca é o de forma em "V", obtido durante o processo de moldagem das amostras.This paper discusses how the shape and preparation of the notch affect crack propagation in ceramic materials with heterogeneous microstructures and, as a result, the maximum load and fracture energy when these materials are subjected to loads using the wedge splitting test. Mortars were prepared with Portland cement, sand and water, which were mixed, molded, and cured at 25 ºC for seven days. After curing, the samples were dried at 55 ºC for 48 h. Two mortar compositions were prepared with proportions of sand:cement of 3:1 and 2:1. Two types of notches were tested: one with a square-tipped profile and the other V-shaped with a 60º

  16. Eesti Energia tahab elektrit toota Pihkvas / Toivo Tänavsuu

    Index Scriptorium Estoniae

    Tänavsuu, Toivo

    2005-01-01

    Eesti Energia ja Venemaa ettevõte RAO Rossija võivad koos rajada Pihkvasse ühise gaasielektrijaama. Eesti Energia juhatuse liikme Lembit Vali kommentaare. Lisa: Fortum ja Eesti Energia otsivad koostöövõimalusi

  17. Eesti Energia gets lower than hoped for price hike

    Index Scriptorium Estoniae

    2008-01-01

    Konkurentsiamet ja Eesti Energia leppisid kokku elektritariifi tõusu põhimõtetes. Elektri hinna tõus on kolm korda väiksem kui Eesti Energia lootis. Eesti Energia on huvitatud tuumaelektrijaamast

  18. Desinfecção de efluentes com tratamento terciário utilizando energia solar (SODIS: avaliação do uso do dispositivo para concentração dos raios solares Disinfection of effluent of wastewater treated using solar energy (SODIS: evaluation of a solar concentrator device

    Directory of Open Access Journals (Sweden)

    José Euclides Stipp Paterniani

    2005-03-01

    Full Text Available A energia solar, além de ser uma fonte natural disponível, é perfeitamente aplicável para desinfecção de águas em regiões menos favorecidas em infra-estrutura e recursos financeiros, uma vez que não há necessidade da dosagem de produtos químicos e não há custo já que materiais comerciais descartados podem ser reutilizados. O presente trabalho utilizou garrafas PET transparentes com a metade pintada de preto, sendo consideradas como variáveis do processo de desinfecção por ação da luz solar: tempos de exposição 1, 2, 4 e 6 horas e o uso de um concentrador de raios solares. Os parâmetros de controle do processo de desinfecção foram turbidez, cor aparente, temperatura, coliformes totais e E. coli, sendo os três últimos parâmetros avaliados antes e após o processo. Para a avaliação de reativação bacteriana a água foi armazenada em moringas de mesa por 24 horas, simulando uma situação comum nas residências rurais brasileiras. Os resultados mostraram que o uso do concentrador solar permite reduzir o tempo de exposição ao sol de 6 para 4 horas, sem prejuízo da eficiência do SODIS. Sendo utilizado o concentrador solar com tempo de exposição de 6 horas tem-se, além do processo de desinfecção, o processo de pasteurização solar (SOPAS, permitindo assim a utilização deste para potabilização da água. Também foi observado que a presença de nuvens reduz a incidência de radiação solar e, portanto, a eficiência do SODIS. Esta última ocorre mesmo com a água atingindo temperatura mais elevada durante a desinfecção.Besides being an available natural resource, the solar energy is very applicable in places with few recourses and low money resources, because there aren't either the need of chemical products neither a huge cost (commercial materials can be reused. To make this job we re-used PET bottles half painted black with the variables: 1, 2, 4 and 6 hours of heat exposion and we also used a

  19. Disponibilidade de carotenoides em relação a energia e proteinas nos domicilios de familias das regiões metropolitanas brasileiras

    OpenAIRE

    Renata Maria Padovani

    2003-01-01

    Resumo: o presente trabalho visou analisar, em nove regiões metropolitanas e dois municípios brasileiros, a disponibilidade de carotenóides, particulannente em relação à energia e proteínas, utilizando-se para tanto os dados publicados nos documentos da POF 1995-1996. A base de dados do USDA (United States Department of Agriculture)-Release 14 foi utilizada para os cálculos referentes ao conteúdo de energia, proteínas e carotenóides (quando o teor de carotenóides de um gênero não era encontra...

  20. Energy education; Pedagogia da energia

    Energy Technology Data Exchange (ETDEWEB)

    Muniz, Rafael Ninno, e-mail: rafaelninno@gmail.com

    2006-07-01

    'Pedagogia da Energia' (energy education) is a qualification course that has as intention to unite ambient education with renewable energies through the art-education and of the long-distance education. Collective made up of theoretical and practical activities through group dynamic and works, with intention to integrate and to enable the participants as a whole, aiming to form potentials to agreement and diffusion of energy concepts of the subjects environment - energy - residues. It possess the structure of an actual course with support of long-distance education with a platform of available web education in the Internet, where the participants have access the all content used in the course (texts, presentations and figures), virtual library, colloquy room, thematic list of quarrel and forum, beyond guardianship accompaniment. A structure constructed in classroom for the participants uses as pedagogical tool titled 'Mandala das Energias' where the concepts studied are worked in. The politics characteristics presented are, ambient and social of the use of the power plants and its implications in the daily one of the humanity. It understands the education as a reciprocal process, that understands the intention to teach and to learn in a set of exchanges of necessary information to the curious nature of the human beings. This article explains the structure and methodology of functioning of the course with a summary of the worked chapters. It also presents the pedagogical tool 'Mandala das Energias' and its respective flowchart of energies that originated it in annex at the end of the text. (author)

  1. Energia eólica

    OpenAIRE

    Carneiro, Joaquim A. O.

    2013-01-01

    O vento (massas de ar em movimento) é utilizado há milhares de anos para suprir as necessidades energéticas que decorrem de um vasto conjunto de actividades humanas. Por exemplo, o vento foi muito utilizado para propulsar alguns meios de transporte (barcos a vela), bombear água ou permitir o funcionamento de actividades industriais, como foi o caso dos moinhos de vento que ainda hoje existem em muitas regiões de Portugal. Como a maior parte das fontes de energia renováveis (excepto a ener...

  2. Evaluation of the response of modified MAGIC-f polymeric gel using a clinical brachytherapy source and Monte Carlo simulation with package PENELOPE; Avaliacao da resposta do gel polimerico MAGIC-f modificado utilizando uma fonte clinica de braquiterapia e simulacao Monte Carlo com o pacote PENELOPE

    Energy Technology Data Exchange (ETDEWEB)

    Quevedo, Ana Luiza; Nicolucci, Patricia, E-mail: anaquevedo@usp.br [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Dept. de Fisica; Borges, Leandro F. [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Setor de Radioterapia

    2016-07-01

    A comparison of experimental and simulated relative doses of a clinical brachytherapy source was performed. A 5 x 5 x 7 cm{sup 3} phantom with a modified MAGIC-f gel was irradiated using a clinical {sup 192}Ir source, Varian, model GammaMed Plus. The phantom was irradiated with 7,5 Gy, commonly used in gynecological treatments. The dose distributions readings were performed 24h after irradiation using Magnetic Resonance Imaging, weighted in T2, with repetition time of 6000 ms, echo-time of 15 ms, 16 echos and 0.40 mm pixel size. The same brachytherapy source was modeled in the Monte Carlo package PENELOPE to obtain dose distributions. The energy cutoff for electrons, photons and positrons was 100 keV, the primary particles condensation parameters remained the same at 0.3. The dose distributions were obtained in two planes perpendicular to the source: one passing through the source’s center and the other at 0.5 cm away from the source’s center in direction of the top of encapsulation. A comparison of the experimental results using the polymeric gel to the computational results showed maximum differences of 12.5%, at 0.62 cm from the source for the central plane, and 6.4% at 0.5 cm from the source for the superior plane. Considering the high dose gradient of these clinical brachytherapy sources, the results obtained in these work show that MAGIC-f gel with modified formulation, is promising for dosimetry in brachytherapy. (author)

  3. Avaliação da correção da energia pelo balanço de nitrogênio em alimentos para frangos de corte

    Directory of Open Access Journals (Sweden)

    R.C. Andrade

    2016-04-01

    Full Text Available Com o objetivo de determinar valores de energia metabolizável aparente e de energia metabolizável aparente corrigida pelo balanço de nitrogênio de alimentos para frangos de corte, bem como avaliar os efeitos da correção da energia sobre seu desempenho, foram conduzidos dois experimentos: I determinação da energia do milho, do farelo de soja, da farinha de carne e ossos, da farinha de vísceras e da farinha de penas, pelo método de coleta total de excretas, utilizando-se 450 pintos de corte com um dia de idade, distribuídos em delineamento inteiramente ao acaso, sendo seis tratamentos e cinco repetições; II desempenho de 960 frangos de corte, distribuídos ao acaso, em cinco tratamentos e seis repetições. As aves que receberam os tratamentos A (matriz energética de acordo com Rostagno et al. (2011 e E (energia sem correção com ajuste pela idade apresentaram melhor desempenho, e as aves do tratamento E tiveram melhor conversão alimentar. Portanto, formulações com energia sem correção pelo balanço de nitrogênio e ajustadas pela idade são viáveis tanto sob o ponto de vista zootécnico, quanto econômico.

  4. Evaluation of the response of polymeric gel modified MAGIC-f using a clinical brachytherapy source and Monte Carlo simulation with package PENELOPE; Avaliacao da resposta do gel polimerico MAGIC-f modificado utilizando uma fonte clinica de braquiterapia e simulacao Monte Carlo com o pacote PENELOPE

    Energy Technology Data Exchange (ETDEWEB)

    Quevedo, Ana Luiza; Nicolucci, Patricia [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Faculdade de Filosofia Ciencias e Letras. Dept. de Fisica; Borges, Leandro F. [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Hospital das Clinicas. Setor de Radioterapia

    2016-07-01

    In this work a comparison of experimental and simulated relative doses of a clinical brachytherapy source was performed. A 5 x 5 x 7 cm{sup 3} phantom with a modified MAGIC-f gel was irradiated using a clinical {sup 192}Ir source and read using Magnetic Resonance Imaging. The Monte Carlo simulation package PENELOPE was used to simulate the dose distributions of the same radiation source. The dose distributions were obtained in two planes perpendicular to the source: one passing through the source's center and the other at 0.5 cm away from the source's center. The higher differences found between experimental and computational distributions were 12.5% at a point 0.62 cm from the source for the central plane and 8.6% at 1.3 cm from the source to the plane 0.5 cm away from the source's center. Considering the high dose gradient of these dose distributions, the results obtained show that the modified MAGIC-f gel is promising for brachytherapy dosimetry. (author)

  5. Determinação dos valores de energia e do balanço de nitrogênio de alguns alimentos para leitões na fase inicial

    OpenAIRE

    Bertol,Teresinha Marisa; Ludke,Jorge Vítor

    1999-01-01

    Este trabalho foi realizado para obter valores de energia digestível (ED) e metabolizável (EM) de quatorze alimentos, em cinco experimentos, utilizando-se 144 leitões com 28 dias de idade e peso médio de 9,42±0,76 kg. O teor de energia digestível (ED) e o de energia metabolizável (EM) foram determinados por intermédio do método de coleta total de fezes e urina. As fontes de proteína provenientes do leite foram superiores aos subprodutos da soja, com relação à digestibilidade da energia e da p...

  6. Eesti Energia hakkab Jordaanias varsti ehitama / Alyona Stadnik

    Index Scriptorium Estoniae

    Stadnik, Alyona

    2011-01-01

    Eesti Energia loodab, et Jordaania esimese põlevkivielektrijaama ehitus algab juba 2012. aastal. Majandus- ja kommunikatsiooniminister Juhan Partsi sõnul on Jordaani puhul tegemist Eesti võimalusega, Eesti Energia on Jordaania projekti kaasanud juba rahastajaid

  7. Eesti Energia, vara veel! / Väino Sarnet

    Index Scriptorium Estoniae

    Sarnet, Väino, 1952-

    2010-01-01

    Majanduskonsultant avaldab arvamust, millised on argumendid Eesti Energia kiireks börsiletulekuks, kes sellega võidaksid ja kes kaotaksid ning miks pole praegu õige aeg Eesti Energia aktsiate avalikuks müügiks

  8. Eesti Energia loovutas Estlinki energiabörsile / Kadri Bank

    Index Scriptorium Estoniae

    Bank, Kadri

    2010-01-01

    Eesti Energia otsustas rentida Estlinki merekaabli välja Soome ja Eesti põhivõrkudele, kellel on omakorda kohustus anda see üle vabaturu kasutusse. Eesti Energia finantsdirektori Margus Kaasiku kommentaar

  9. Turquia e a Energia: Desafios e Potencialidades

    OpenAIRE

    Revés, Mafalda Sofia Damas Vargas

    2014-01-01

    O acesso à energia é uma das principais preocupações de todos os Estados quer dos economicamente desenvolvidos quer dos em vias de desenvolvimento. Da energia dependem todos os sectores económicos do primário ao terciário. Com o desenvolvimento tecnológico as necessidades das populações, das atividades produtivas e dos serviços fazem crescer a procura energética. A segurança energética é encarada como uma parte importante da segurança dos países, sendo o consumo energético permanente, o co...

  10. Intelligent use of the energy; Uso inteligente de la energia

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez Ahedo, Carlos [Director General de la Comision Nacional para el Ahorro de Energia (CONAE), Mexico D. F. (Mexico)

    2005-07-01

    Comision Nacional para el Ahorro de Energia (CONAE) is an administrative agency independent of the Secretaria de Energia that serves as a technical agency for consultancy in matters of efficient use of energy and advantageous use of renewable energies. This document searches to inform the population how to satisfy the necessity of energy in an intelligent way. For this purpose some useful actions to be performed were detected: the making of a balance between the supply and the energy demand, the consultancy on how the saving of energy is performed in order to reduce its waste, to count on equipment and efficient systems, to use domestic renewable energies and to use the solar energy and the biomass. [Spanish] La Comision Nacional para el Ahorro de Energia (CONAE) es el organo administrativo desconcentrado de la Secretaria de Energia que funge como organismo tecnico de consulta en materia de ahorro y uso eficiente de energia y aprovechamiento de energias renovables. Este documento busca informar a la poblacion acerca de como satisfacer la necesidad de energia a cambio de su utilizacion de manera inteligente, para ello se detectaron areas de oportunidad como: un balance entre la oferta y la demanda energetica, informar a la gente sobre como se efectua el ahorro de energia para con ello reducir el desperdicio de esta, contar con equipos y sistemas eficientes, usar energias renovables domesticas y utilizar la energia solar y la biomasa.

  11. Integral programs of energy conservation (exergy) in the petroleum industry; Programas integrales de ahorro de energia (exergia) en la industria petrolera

    Energy Technology Data Exchange (ETDEWEB)

    Rivero Rodriguez, R. [Instituto Mexicano del Petroleo (IMP), Mexico, D. F. (Mexico)

    1995-12-31

    This paper presents some of the fundamental issues related to energy conservation programs in general and to the petroleum industry in particular with the purpose of integrating them both, that is, considering not only the energy issues, but also the ecological and economical aspects. This is achieved by using the two fundamental laws of thermodynamics (the science that studies energy, its characteristics, and its transformations) through the use of the exergy concept, which is a measure of the energy quality and of its withdrawal with respect to the environment. The origins of the present-day technologies, regarding energy conservation, the short, medium and long term general strategies and the implementation stages of the integral programs of energy conservation are presented, and it concludes with a series of general policies aimed at making the energy conservation programs more congruent with the maintenance of a sustainable development. [Espanol] En este trabajo se presentan algunos aspectos fundamentales relacionados con los programas de ahorro de energia en general, y en la industria petrolera en particular, con objeto de lograr que los mismos sean integrales, es decir que consideren no solo los aspectos puramente energeticos, sino tambien los aspectos ecologicos y economicos. Esto se logra utilizando conjuntamente las dos leyes fundamentales de la termodinamica (la ciencia que estudia la energia, sus caracteristicas y sus transformaciones), mediante la utilizacion del concepto de exergia, que es una medida de la calidad de la energia y de su alejamiento con respecto al medio ambiente. Se presentan los origenes de las tendencias tecnologicas actuales en materia de ahorro de energia, las estrategias generales a corto, mediano y largo plazos y las etapas en la implementacion de programas integrales de ahorro de energia, para concluir con una serie de politicas generales tendientes a lograr que los programas de ahorro de energia sean congruentes con el

  12. Wind energy for electricity generation; Generacion electrica con energia del viento

    Energy Technology Data Exchange (ETDEWEB)

    Huacuz Villamar, Jorge M.; Borja Diaz, Marco Antonio R. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-09-01

    A description is made of electricity generation utilizing wind energy (Eoloelectric Generation). The case of Mexico is reviewed in respect to this technology, mentioning a small power plant of 1.5 Megawatts installed by the Comision Federal de Electricidad in the zone of La Ventosa in the State of Oaxaca. Mention is made of the possible causes why Mexico has not advanced in this type of power plants for power generation as in other countries like Germany, Spain and India. The advance in these countries is shown as well as the growth statistics of the wind power in the world. It is concluded that there is not in Mexico a strategy for wind energy utilization for electricity generation in spite of the potential benefits this technology offers [Espanol] Se describe el caso de la generacion electrica utilizando la energia del viento (Generacion Eoloelectrica). Se aborda el caso de Mexico respecto a esta tecnologia, mencionando una pequena central de 1.5 Megawatts (MW) instalada por la Comision Federal de Electricidad (CFE) en la zona de la Ventosa, Oaxaca. Se mencionan las posibles causas por las que en Mexico este tipo de centrales de generacion de energia no ha avanzado como en otros paises, por ejemplo: Alemania, Espana y la India. Se muestran los avances de estos paises, asi como una estadistica del crecimiento de la generacion eoloelectrica en el mundo. Se concluye en que no existe en Mexico una estrategia para la generacion eoloelectrica a pesar de los beneficios potenciales que ofrece esta tecnologia

  13. Energy. Chapter 4; Energia. Capitulo 4

    Energy Technology Data Exchange (ETDEWEB)

    Martin del Castillo, Carlos [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2009-07-01

    This chapter stands out that the infrastructure for the electric energy generation, as well as the one departing from fossil fuels has been the responsibility of two institutions with great solvency in the scope of engineering: the Comision Federal de Electricidad (CFE) and Petroleos Mexicanos (PEMEX). It is presented here the energy future in a sustainable context; a prospective study to year 2050; a strategic proposal of Petroleos Mexicanos; the forecast of the oil industry in Mexico and a technological prospective of the energy. [Spanish] En este capitulo se destaca que la infraestructura para la generacion de energia, tanto electrica como a partir de combustibles fisiles ha corrido a cargo de dos instituciones con gran solvencia en el ambito de la ingenieria: la Comision Federal de Electricidad (CFE) y Petroleos Mexicanos (Pemex). Se presenta el futuro de la energia en un contexto sustentable; un estudio prospectivo al ano 2050; una propuesta estrategica de Petroleos Mexicanos; la prospectiva de la industria petrolera en Mexico y; una prospectiva tecnologica de la energia.

  14. METODOLOGIA PARA DESPACHO DE FONTES DE GD A BIOGÁS EM REDES DE DISTRIBUIÇÃO UTILIZANDO LÓGICA FUZZY

    OpenAIRE

    Luiz Fernando Guarenti Martins

    2012-01-01

    Este trabalho tem a finalidade de definir o período do dia para o despacho de uma fonte alternativa de geração distribuída de energia elétrica (GD), utilizando como combustível o biogás proveniente de reações anaeróbias que ocorrem em resíduos sólidos urbanos (RSU) depositados em células do Aterro Sanitário de Recreio no município de Minas do Leão à rede da Companhia Estadual de Distribuição de Energia Elétrica (CEEE-D). Inicialmente foi utilizado o software Biogás para estimar...

  15. Parts harvendas ootamatult Eesti Energia nõukogu / Andres Eilart

    Index Scriptorium Estoniae

    Eilart, Andres

    2011-01-01

    Majandus- ja kommunikatsiooniminister Juhan Parts otsustas 1. juulil päevapealt Eesti Energia nõukogu liikme kohalt tagasi kutsuda Aivar Reiviku ning Rein Kuusmiku, kes olid vastu Eesti Energia üle viie miljoni euro suurusele investeeringule Weroli rapsiõlitehase juurde rajatavasse elektri- ja küttejaama. Uuteks nõukogu liikmeteks said Andres Saame ja Toomas Tauts

  16. Eesti Energia pakuks börsil boonusaktsiaid / Agnes Ojala

    Index Scriptorium Estoniae

    Ojala, Agnes

    2010-01-01

    Majandus- ja kommunikatsiooniministeerium valmistub Eesti Energia aktsia avalikuks pakkumiseks. Riik soovib, et aktsionäride hulgas oleks rohkelt tavakodanikke, aktsiate ostmise motiveerimiseks lubatakse, et aasta pärast kingitakse lisaaktsiaid. Rahandusministeerium peab otsima alternatiive, kuidas Eesti Energia saaks lisaraha börsile minemata

  17. Härra Eesti Energia lahkus haruldase kaevurikirkaga / Andrus Karnau

    Index Scriptorium Estoniae

    Karnau, Andrus

    2005-01-01

    30. novembril oli Eesti Energia juhi kohalt lahkuval Gunnar Okil viimane tööpäev, kuigi Eesti Energia juhatus pakkus Gunnar Okile korralise lepingu lõppemise järel aastast lepingut, keeldus juhatuse esimees selle sõlmimisest. Lisa: Oki-ajastu

  18. Thermoresponsive Gels

    OpenAIRE

    Taylor, M. Joan; Tomlins, P.; Sahota, T. S.

    2016-01-01

    An invited review and relates to the responsive gel used in the "artificial pancreas" work og INsmart, DMU. This article is an Open Access journal. Thermoresponsive gelling materials constructed from natural and synthetic polymers can be used to provide triggered action and therefore customised products such as drug delivery and regenerative medicine types as well as for other industries. Some materials give Arrhenius-type viscosity changes based on coil to globule transitions. Others ...

  19. 77 FR 74472 - Application to Export Electric Energy; Energia Renovable S.C., LLC

    Science.gov (United States)

    2012-12-14

    ... Application to Export Electric Energy; Energia Renovable S.C., LLC AGENCY: Office of Electricity Delivery and Energy Reliability, DOE. ACTION: Notice of application. SUMMARY: Energia Renovable S.C., LLC (Energia... application from Energia Renovable for authority to transmit electric energy from the United States to Mexico...

  20. Thermoresponsive Gels

    Directory of Open Access Journals (Sweden)

    M. Joan Taylor

    2017-01-01

    Full Text Available Thermoresponsive gelling materials constructed from natural and synthetic polymers can be used to provide triggered action and therefore customised products such as drug delivery and regenerative medicine types as well as for other industries. Some materials give Arrhenius-type viscosity changes based on coil to globule transitions. Others produce more counterintuitive responses to temperature change because of agglomeration induced by enthalpic or entropic drivers. Extensive covalent crosslinking superimposes complexity of response and the upper and lower critical solution temperatures can translate to critical volume temperatures for these swellable but insoluble gels. Their structure and volume response confer advantages for actuation though they lack robustness. Dynamic covalent bonding has created an intermediate category where shape moulding and self-healing variants are useful for several platforms. Developing synthesis methodology—for example, Reversible Addition Fragmentation chain Transfer (RAFT and Atomic Transfer Radical Polymerisation (ATRP—provides an almost infinite range of materials that can be used for many of these gelling systems. For those that self-assemble into micelle systems that can gel, the upper and lower critical solution temperatures (UCST and LCST are analogous to those for simpler dispersible polymers. However, the tuned hydrophobic-hydrophilic balance plus the introduction of additional pH-sensitivity and, for instance, thermochromic response, open the potential for coupled mechanisms to create complex drug targeting effects at the cellular level.

  1. Eesti Energia pikaajaline investeeringuplaan vajab raha / Helga Koger

    Index Scriptorium Estoniae

    Koger, Helga, 1945-

    2008-01-01

    Eesti Energi juht Sandor Liive küsis valitsuskabinetis tulevikuplaane esitledes ettevõtte aktsiakapitali laiendamiseks juurde 500 miljonit eurot. Eesti Energia on koostanud investeerimisplaani aastateks 2009-2018, lisaks tahab ta kehtestada energiajulgeolekumaksu

  2. Variancia intrapessoal da ingestao de energia e nutrientes em adolescentes: correcao de dados em estudos epidemiologicos

    Directory of Open Access Journals (Sweden)

    Eliseu Verly Junior

    2013-03-01

    Full Text Available OBJETIVO: Este artigo objetiva fornecer valores de componentes de variância intrapessoal da ingestão de energia e nutrientes que possibilita estimar a ingestão habitual em adolescentes, em inquéritos dietéticos quando há disponível somente um recordatório de 24 horas para cada indivíduo. Também será fornecido um exemplo de sua aplicação na correção da distribuição da ingestão de nutrientes proveniente de adolescentes de outro estudo. MÉTODOS: Foram utilizados recordatórios de 24 horas de 215 adolescentes do município de São Paulo. Os componentes de variância foram estimados utilizando o Software for Intake Distribution Estimation (PC-SIDE. Para cada nutriente foi construído um modelo, estratificado por sexo, que inclui o dia e o mês da coleta, e variáveis de ponderação. RESULTADOS: Os componentes de variância intrapessoal variaram de 0,55 para gordura mono-saturada (sexo feminino a 0,96 para o folato (sexo masculino. Entre os macronutrientes e energia foram observados valores mais elevados para o sexo masculino. No exemplo da aplicação do componente de variância, foi estimada a distribuição da ingestão de vitamina B6 com menos viés comparada à distribuição sem a correção. CONCLUSÃO: Estes dados podem ser utilizados na estimativa da ingestão habitual de energia e nutrientes e cálculo da prevalência de inadequação em adolescentes de populações semelhantes, quando há disponível somente um recordatório de 24 horas para cada indivíduo do estudo.

  3. Biodiesel: uma energia alternativa e verde

    Directory of Open Access Journals (Sweden)

    Milena Carvalho Teixeira

    2010-12-01

    Full Text Available O presente texto busca expor a importância do uso de energias alternativas. O biodiesel é apontado como uma das soluções para o esgotamento do petróleo e seus derivados e para o problema do aquecimento global, e o Brasil, por apresentar biodiversidade e forte economia agrícola, permitiu que o Governo Federal criasse o Programa Nacional de Produção e Uso de Biodiesel (PNPB com chances de sucesso. O programa explora várias fontes energéticas, de culturas temporárias e perenes ao uso do óleo residual, além de trazer benefícios ao desenvolvimento do país, gerando emprego e renda, e, principalmente, redução nas emissões de gás carbônico.

  4. Eesti Energia sihib hiiglaslikku hinnatõusu / Andrus Karnau

    Index Scriptorium Estoniae

    Karnau, Andrus

    2007-01-01

    Ilmunud ka: Postimees : na russkom jazõke, 5. sept. 2007, lk. 2. Eesti Energia taotleb 2007. aasta märtsikuust 23%-list hinnatõusu. Energiaturu inspektsiooni (ETI) juhi Märt Otsa sõnul pole teada, mis otsuse inspektsioon hinnatõusu küsimuses langetab. Diagramm: Elektri hind tõuseb jõudsalt. Vt. samas intervjuud Eesti Energia juhatuse liikme Tiit Niguliga

  5. Correlação e causalidade entre os preços de commodities e energia

    Directory of Open Access Journals (Sweden)

    Dienice Ana Bini

    2015-08-01

    Full Text Available Objetiva-se testar a cointegração e a causalidade entre os preços de energia e commodities agrícolas nas condições comercias do Brasil. Utilizando- se dados de preço mensais de 2000 a 2012 das commodities: petróleo, etanol, cana, milho, soja, taxa de câmbio, e ainda os preços americanos de milho e etanol. O petróleo e taxa de câmbio apresentaram coeficientes significativos a 10% para todos os produtos. O etanol foi significativo para a cana de açúcar, soja e milho, mostrando o entrelaçamento entre os preços de energia e produtos agrícolas no Brasil. Isso é evidenciado pelas relações significativas de cointegração da soja com a cana, etanol e milho. Identificou-se causalidade no sentido de Granger do milho e etanol americano para o etanol brasileiro, e do milho americano para o milho e a soja do Brasil. Pode-se concluir que há transmissão de preços das commodities energéticas para as commodities agrícolas e entre as commodities.

  6. Geração de energia elétrica excedente no setor sucroalcooleiro: um estudo a partir das usinas paulistas

    Directory of Open Access Journals (Sweden)

    Zilmar José de Souza

    2006-06-01

    Full Text Available A geração de energia elétrica por parte do setor sucroalcooleiro encontra-se muito aquém de seu potencial. Este artigo tem por objetivo identificar os entraves para a ampliação da oferta de excedentes de energia elétrica pelo setor sucroalcooleiro, utilizando, para tanto, cinco estudos de caso com usinas paulistas. Os elevados custos associados à comercialização da energia elétrica - seja na venda de excedentes, seja na aquisição para consumo próprio - constituem a explicação mais plausível para a auto-suficiência na produção de energia elétrica pelo setor sucroalcooleiro, aliada à pequena geração de excedentes de energia para comercialização. Das cinco usinas estudas, as três que comercializam excedentes de energia o fazem como parte de uma estratégia de antecipação da necessidade futura de auto-suficiência. Havendo custos associados à venda de excedentes de energia elétrica, não há incentivos à utilização de tecnologias de maior eficiência energética. As políticas públicas voltadas à expansão dos excedentes de energia devem voltar-se para a redução dos custos associados à comercialização de excedentes de energia. Particularmente interessante é aumentar o volume de consumidores livres e amparar a comercialização entre estes e os co-geradores de energia.The generation of electric energy by the sugarcane sector stands much below its potential. Using five case studies with São Paulo plants, this article aims to identify the obstacles to the expansion of the electric energy commercialization by the sugarcane sector. High costs associated to the commercialization of electric energy - in commercialization of excesses, and in the acquisition for proper consumption - are the most reasonable explanation for the self-sufficiency in the production of electric power by the sugarcane sector, an allied energy to the small generation of excesses of energy for commercialization. Out of the five plants

  7. Electric energy saving using natural illumination, in educational spaces; Ahorro de energia electrica utilizando iluminacion natural, en espacios educativos

    Energy Technology Data Exchange (ETDEWEB)

    Alpuche, Maria G; Marincic, Irene; Ochoa, Jose M [Programa de Arquitectura, Universidad de Sonora (Mexico)

    2008-07-15

    In this article the natural illumination in a space pertaining to the building of Architecture of the University of Sonora, in the city of Hermosillo is analyzed, Located towards the Northeast facade. This same space is repeated in the South facade, and paradoxically the space has the same dimensions and the same luminance design. Also the simulation of natural illumination by means of the Ecotec program is realized, and the levels of natural illumination in educational spaces, corresponding to the facilities of the University of Sonora are analyzed, where most of the year there is a completely clear sky. [Spanish] En este articulo se analiza la iluminacion natural en un espacio correspondiente al edificio de Arquitectura de la Universidad de sonora, en la ciudad de Hermosillo, Ubicado hacia la fachada Noreste. Este mismo espacio se repite en la fachada Sur, y el espacio tienen las mismas dimensiones y paradojicamente, el mismo diseno luminico. Tambien se realiza la simulacion de iluminacion natural mediante el programa Ecotec, y se analizan los niveles de iluminacion natural en espacios educativos, correspondientes a las instalaciones de la Universidad de Sonora, donde la mayor parte del ano se cuenta con un cielo completamente despejado.

  8. Sõnnikust elektri tootmine on Eesti Energia otsustada / Toivo Tänavsuu

    Index Scriptorium Estoniae

    Tänavsuu, Toivo

    2006-01-01

    Seakasvatusfirma Ekseko tahab hakata seasõnnikust elektrit ja soojust tootma, kui Eesti Energia finantseerib projekti. Taani konsultatsioonifirma Energy Consulting Network soovitab rajada koostootmisjaama maksumusega umbes 50-60 miljonit krooni. Lisa: Eesti Energia teeb otsuse lähiajal

  9. Parts ja Tiivas peavad aega Eesti Energia börsile tulekuks heaks / Jaana Pikalev

    Index Scriptorium Estoniae

    Pikalev, Jaana

    2010-01-01

    Majandus- ja kommunikatsiooniminister Juhan Partsi sõnul tuleks Eesti Energia aktsiat müüa soodustingimustel. East Capital Exploreri juhi Gert Tiivase hinnangul pole paremat aega Eesti Energia börsile toomiseks kui praegu

  10. "Oravad" tõmbavad Eesti Energia börsileminekule piduri peale / Raimo Poom

    Index Scriptorium Estoniae

    Poom, Raimo

    2010-01-01

    Riigikogu Reformierakonna fraktsiooni kohtumisest Eesti Energia juhi Sandor Liive ning majandus- ja kommunikatsiooniministeeriumi esindajatega. Fraktsiooni esimees Peep Aru räägib küsimustest, mis on seotud Eesti Energia börsilemineku kavaga

  11. Eesti Energia tegi esimesed tehingud elektribörsil / Kerli Nõu

    Index Scriptorium Estoniae

    Nõu, Kerli

    2006-01-01

    Eesti Energia ei avalikusta NordPoolil sõlmitud tehingute mahtu ärisaladuse tõttu. NordPooli börsil hajutavad riske energia tootjad, suurtarbijad ja hulgikauplejad, kes peavad end energia hinnatõusu vastu kaitsma. Järgmise aasta tulevikutehingute hinda mõjutavatest teguritest. Lisa: NordPool

  12. Clean generation of electric energy; Generacion limpia de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez, Juan M.; Torres, Emmanuel [Centro de Investigacion y de Estudios Avanzados (CINVESTAV), Unidad Guadalajara (Mexico)

    2006-10-15

    This article deals on the existing alternatives of renewable energy for generation of electricity free from polluting sequels within the Mexican territory and presents a global overview on the electricity generation in Mexico. Wind power, hydraulic energy, biomass, photovoltaic and fuel cells are sources of renewable energy that could contribute to Mexico's sustainable development, for this reason it is discussed on the main sources of renewable energy in Mexico - solar and wind energy, mini-hydraulic, biomass and geothermal -, on their development and evolution, cost, insertion projects and obstacles for their correct development in this country. [Spanish] Este articulo versa sobre las alternativas de energia renovable existentes para una generacion de electricidad libre de secuelas contaminantes dentro del territorio mexicano y presenta un panorama global sobre la generacion de electricidad en Mexico. La energia eolica, hidraulica, biomasa, fotovoltaica y las celdas de combustible son fuentes de energia renovable que podrian contribuir al desarrollo sustentable de Mexico, por esto se arguye sobre las principales fuentes de energia renovable en Mexico -energia solar, eolica, minihidraulica, biomasa y geotermia-, sobre su desarrollo y evolucion, costo, proyectos de insercion y obstaculos para su correcto desarrollo en ese pais.

  13. Estudo de analgesia tópica pós-peeling facial profundo utilizando máscara a base de água, gel e óleo de melaleuca em comparação com o uso de máscara umedecida em soro fisiológico no Conjunto Hospitalar de Sorocaba

    Directory of Open Access Journals (Sweden)

    Hamilton Aleardo Gonella

    2016-10-01

    Full Text Available INTRODUÇÃO: O peeling químico profundo é um procedimento que proporciona a esfoliação controlada da epiderme e derme com posterior renovação celular. Promove a normalização da pigmentação da pele, atenua cicatrizes, manchas, além de minimizar rugas finas. OBJETIVOS: Nosso objetivo foi observar se ocorre uma melhora da dor pós procedimento do peeling ao utilizar uma máscara a base de água deionizada, deionizada, gel alimentar e óleo de melaleuca, o Water Jel® , um material que já é utilizado em ferimentos por queimadura com relatos de parar a progressão da queimadura, alívio da dor e prevenção de injúrias ao ao resfriar a lesão e atuar como inibidor da resposta inflamatória local. JUSTIFICATIVA: Muitos pacientes deixam de propiciar melhoramento da aparecia da pele danificada por fatores extrínsecos e intrínsecos devido ao estigma da algia pós-peeling. Dessa forma, com a analgesia adequada os benefícios do peeling serão sentidos e apreciados pelo paciente com maior aceitação. METODOLOGIA: A seleção para as candidatas à realização do procedimento foi feita através da Classificação de Fitzpatrick (apenas fototipo tipo I e II selecionadas. As pacientes passavam por preparação da pele com uma aplicação prévia de hidroquinona (pelo menos 3 semanas antes do procedimento. Após o peeling, a algia foi avaliada por uma escala numérica e facial a partir de uma comparação entre hemifaces direita e esquerda, uma coberta com a mascara de Water Jel®, outra com a mesma mascara umedecida em soro, sem os princípios ativos do produto estudado,logo após a realização do peeling de Acido Tricloroacético. A paciente não sabia em qual hemiface cada máscara foi manipulada. O estudo foi realizado em 17 pacientes. RESULTADOS: A análise estatística pelo Teste de Wilcoxon não identificou diferença significativa entre as hemifaces esquerda e direita, uma vez que as médias das notas foram similares em ambas escalas.

  14. Densification and crystalization kinetics of mullite diphasic gels from non_isothermal dilatometry experiments

    Directory of Open Access Journals (Sweden)

    Orgaz, Felipe

    2008-12-01

    Full Text Available Mullite (3 AI2O3_2 SiO2 was processed by mixing silica and alumina colloids at pH below 3 in a high shear blender. The gels were sieved to ‹ 125 microns and cold isostatically pressed to form rods. The various processes involved during the sintering process such as condensation-polymerization and the competition between mullite crystallization and densification were analysed from constant heating rate equations and rate controlled sintering dilatometer experiments. Changes in the slopes permitted the identification of such processes and the activation energy for mullitization was calculated. Fast firing (20-30 K/min in the critical mullitization temperature range of 1230-1505ºC and low heating rates (2-3 K/min in the viscous flow densification intervals of below 1230ºC and higher than 1505 gives rise to near full density and fine grain microstructures of sintered mullite. Fast firing and high (0.5 to 1 % /min densification rate controlled processes seem to be the most suitable approaches to high density gel processed mullite. Amorphous silica is the rate controlling mechanism for the viscous flow densification process before alumina is solved and nucleation and crystallization of mullite appears. Deviations from the linear Frenkel model for viscous flow are also observed.

    Mullita de composición (3Al2O3 -2 SiO2 ha sido preparada mezclando coloides de sílice y alúmina en un mezclador de alta velocidad a pH inferior a 3. Los geles formados eran secados, tamizados por debajo de 125 micras y prensados isostáticamrente para formar varillas de unos 6 mm de diámetro. Los diferentes procesos que ocurren durante el proceso de sinterización, tales como polimerización- condensación y la competición entre cristalización y densificación, han sido analizados utilizando las ecuaciones de ecuaciones de velocidad de calentamiento constantte y experimentos

  15. The use of reflecting paints on building`s roofs for energy saving; Uso de pinturas reflejantes en los techos de las edificaciones para el ahorro de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Valera Negrete, Jose Adrian [Programa de Ahorro de Energia del Sector Electrico (PAESE), Comision Federal de Electricidad, Mexico, D. F. (Mexico); Sanchez Soto, Ramon [Facultad de Ingenieria, Departamento de Termoenergia de la UNAM, Mexico, D. F. (Mexico)

    1998-12-31

    This paper shows the effects of the use of reflecting paints in different colors on the buildings roofs and the results in energy saving obtained in a field test carried on in Monterrey, Nuevo Leon State of Mexico using aluminum paint. [Espanol] El presente trabajo muestra los efectos del uso de pinturas reflejantes de diferentes colores en los techos de edificaciones, y los resultados de ahorro de energia electrica obtenidos en una prueba de campo efectuada en Monterrey, Nuevo Leon, Mexico, utilizando pintura de aluminio.

  16. Standardization for electric energy saving; Normalizacion para el ahorro de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Reyes Diaz, Arturo [Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE), Mexico, D. F. (Mexico)

    1993-12-31

    This work describes shortly the current legislation on the standardization; as well as the participation of the entities Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) and Programa de Ahorro de Energia (PAESE) in the consulting committees, for the elaboration of the Mexican official standards focussed to electric power saving. [Espanol] El presente trabajo, describe brevemente la legislacion actual sobre la normalizacion; asi como la participacion de las entidades Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) y Programa de ahorro de Energia (PAESE) en los comites consultivos, para la elaboracion de normas oficiales mexicanas enfocadas al ahorro de energia electrica.

  17. Renewable energy and technological development; Energia renovable y desarrollo tecnologico

    Energy Technology Data Exchange (ETDEWEB)

    Covarrubias Ramos, Rogelio [Fideicomiso para el ahorro de energia, (Mexico)

    2007-06-15

    In this presentation is widely described the work carried out by the Trust Fund for Electrical Energy Savings (FIDE) with reference to renewable energy foster. In the first part, it is found the FIDE's mission, which is focused on achieving the efficient use of the energy. Then, there are quiet briefly described the processes -carried out by the FIDE- in favour of the groundbreaking technology that achieves to decrease the energy squandering. In addition, there are mentioned different means boosting the energy savings. Then, there are described the issues the energy system should change in order to improve the actual situation of many Mexicans. There are briefly mentioned not only the environmental but also the social benefits of the use of renewable energy; besides, there are given the necessary elements in order to make it possible. Then, there are explained why the use of renewable energy would be profitable. Finally, it is described the methodology that should be followed in case it is wanted to find sponsors up to 100% for a project related to improvement of the energy production. [Spanish] Esta presentacion describe ampliamente la labor que realiza el Fideicomiso para el ahorro de energia (FIDE) en relacion con el fomento de la energia renovable, asi como el desarrollo de tecnologias que refuercen el uso de este tipo de energia. En la primera parte, se encuentra la mision del FIDE, que se enfoca en lograr que el uso de la energia sea apropiado. Enseguida, de forma breve se describen los procesos que realiza el FIDE en favor de la tecnologia innovadora que haga decrecer el dispendio de energia. Luego, se explican las aspectos endebles del sistema energetico de Mexico. Se describen escuetamente los beneficios, no solo ambientales sino tambien sociales, del uso de energia renovable; ademas, se mencionan los elementos necesarios para que esto pueda lograrse. Mas adelante, se dan las razones por las que para Mexico seria rentable el uso de energia renovable

  18. Removing water from gels

    International Nuclear Information System (INIS)

    Lane, E.S.; Winter, J.A.

    1982-01-01

    Water is removed from a gel material by contacting the gel material with an organic liquid and contacting the organic liquid with a gas such that water is taken up by the gas. The invention, in one embodiment, may be used to dry gel materials whilst maintaining an open porous network therein. In one example, the invention is applied to gel precipitated spheres containing uranium and plutonium. (author)

  19. Polymer gels and networks

    National Research Council Canada - National Science Library

    Osada, Yoshihito; Khokhlov, A. R

    2002-01-01

    ... or magnetic field, etc.). It was realized that not only can polymer gels absorb and hold a considerable volume of liquids, but they can also be forced to expel the absorbed liquid in a controlled manner. Of particular interest are hydrogels, i.e., polymer gels, which swell extensively in water. The most common hydrogels are polyelectrolyte gels: ...

  20. Potencial de economia de energia elétrica em edificações comerciais híbridas localizadas em Florianópolis, SC

    Directory of Open Access Journals (Sweden)

    Ricardo Forgiarini Rupp

    Full Text Available A ventilação natural baseada em aberturas nas fachadas tem sua aplicabilidade limitada pelas características do clima, local e tipo de edificação, mas pode ser potencializada por meio da ventilação híbrida (ventilação natural e mecânica. O objetivo deste artigo é estimar o potencial de economia de energia elétrica com a utilização da ventilação híbrida em edifícios comerciais localizados em Florianópolis, SC. Como modelos de ambiente foram utilizadas salas com diferentes geometrias e tamanhos, em quatro orientações e com dez dimensões de janela por ambiente. Cada modelo foi estudado por dois casos: um caso-base em que se operou somente com sistema de ar condicionado; e um caso em que se aplicou a ventilação híbrida. As simulações termoenergéticas foram realizadas no programa EnergyPlus, utilizando-se do arquivo climático de Florianópolis TRY. A partir dos resultados das simulações obteve-se o consumo anual de eletricidade de cada ambiente. Os consumos do caso-base foram comparados com os do caso com ventilação híbrida. Desse modo, calcularam-se as porcentagens de economia de energia geradas pelo uso da ventilação híbrida. Além disso, foi realizada uma análise de alternativas de comportamento do usuário com relação aos padrões de uso da ventilação híbrida. A estratégia híbrida de ventilação apresentou uma significativa economia de energia, chegando-se a uma redução de consumo total de energia de até 31,9%. Porém, em que pese este potencial de economia de energia, é provável que os usuários possam se sentir insatisfeitos em determinados dias quentes, nos quais o sistema de ar condicionado é desligado em algum momento.

  1. Konverents "Turg. Tööstus. Energia." / T Tiidemann

    Index Scriptorium Estoniae

    Tiidemann, T

    1993-01-01

    Rootsi organisatsioon SWENESCO (Swedish Network of Engineers and Seientists for Conversion - Rootsi inseneride ja teadlaste võrk konversiooni eest) korraldab konverentsi praktilistest kogemustest Rootsi - Eesti tööstuse ja energia tehnikaalastes projektides 18-20 juuni 1993 Pirita Purjespordikeskuses

  2. Energia avastuskeskus = Energy discovery center / Margit Aule ; kommenteerinud Kristiina Raid

    Index Scriptorium Estoniae

    Aule, Margit, 1981-

    2015-01-01

    Energia avastuskeskuse (Põhja pst 29/31, Tallinn) interjöörist ja ekspositsiooni kujundusest. Autor Margit Argus (KAOS Arhitektid); ekspositsiooni kujundus Margit Argus, Margit Aule; arhitektid Sander Aas, Margit Aule, Pelle Sten Viiburg (KAOS Arhitektid). Eesti Sisearhitektide Liidu aastapreemia 2014/2015 parima ajaloolise interjööri eest

  3. Eesti Energia salajased uuringud / Sulev Vedler, Tarmo Vahter

    Index Scriptorium Estoniae

    Vedler, Sulev, 1970-

    2007-01-01

    Ilmunud ka: Infopress 2. märts nr. 9 lk. 160. Hoitakse salajas Briti konsultatsioonifirma Lexicon Partners poolt koostatud uuringut, mida peaks Eesti riik peale hakkama oma osalusega monopoolses elektriettevõttes Eesti Energia. Majandusminister Edgar Savisaar lasi uuringu ministeeriumisse tuua ning andis juristidele ülesande analüüsida, kui palju saab dokumendist avaldada. Vt. samas: Elektri hind

  4. Ambientes virtuales de aprendizaje utilizando realidad aumentada

    Directory of Open Access Journals (Sweden)

    Diana Nancy Martínez García

    2018-03-01

    Full Text Available Realidad aumentada o Augmented reality es una nueva tecnología que al combinarla con espacios físicos permite ampliar el espectro de la información relacionada con dichos espacios; esto se hace a través de la superposición de imágenes, información o material audiovisual específico aplicado a cualquier área de conocimiento. Los ambientes virtuales de aprendizaje basados en realidad aumentada prometen innovación debido a que transforman los escenarios de aprendizaje real mediante el uso de nuevas tecnologías aplicadas al ámbito educativo, complementando de esta manera la percepción e interacción con el mundo real; logrando el acceso a nuevos contenidos prescindiendo de recursos físicos. En cuanto al uso de la realidad aumentada aplicada al área de enfermería, existe un sinnúmero de herramientas para complementar una clase magistral y enriquecer el proceso de aprendizaje. Sin embargo, la mayoría de los desarrollos realizados utilizando realidad aumentada proviene de contextos diferentes al nuestro, por lo que resulta importante fomentar el uso de este tipo de herramientas para que suscite el interés de los desarrolladores locales de tecnologías aplicadas al ámbito educativo y más específicamente el de salud. El objetivo de la presente revisión fue fundamentar teóricamente acerca de los ambientes virtuales de aprendizaje utilizando aplicaciones basadas en realidad aumentada.

  5. Transport Phenomena in Gel

    Directory of Open Access Journals (Sweden)

    Masayuki Tokita

    2016-05-01

    Full Text Available Gel becomes an important class of soft materials since it can be seen in a wide variety of the chemical and the biological systems. The unique properties of gel arise from the structure, namely, the three-dimensional polymer network that is swollen by a huge amount of solvent. Despite the small volume fraction of the polymer network, which is usually only a few percent or less, gel shows the typical properties that belong to solids such as the elasticity. Gel is, therefore, regarded as a dilute solid because its elasticity is much smaller than that of typical solids. Because of the diluted structure, small molecules can pass along the open space of the polymer network. In addition to the viscous resistance of gel fluid, however, the substance experiences resistance due to the polymer network of gel during the transport process. It is, therefore, of importance to study the diffusion of the small molecules in gel as well as the flow of gel fluid itself through the polymer network of gel. It may be natural to assume that the effects of the resistance due to the polymer network of gel depends strongly on the network structure. Therefore, detailed study on the transport processes in and through gel may open a new insight into the relationship between the structure and the transport properties of gel. The two typical transport processes in and through gel, that is, the diffusion of small molecules due to the thermal fluctuations and the flow of gel fluid that is caused by the mechanical pressure gradient will be reviewed.

  6. Sol-Gel Glasses

    Science.gov (United States)

    Mukherjee, S. P.

    1985-01-01

    Multicomponent homogeneous, ultrapure noncrystalline gels/gel derived glasses are promising batch materials for the containerless glass melting experiments in microgravity. Hence, ultrapure, homogeneous gel precursors could be used to: (1) investigate the effect of the container induced nucleation on the glass forming ability of marginally glass forming compositions; and (2) investigate the influence of gravity on the phase separation and coarsening behavior of gel derived glasses in the liquid-liquid immiscibility zone of the nonsilicate systems having a high density phase. The structure and crystallization behavior of gels in the SiO2-GeO2 as a function of gel chemistry and thermal treatment were investigated. As are the chemical principles involved in the distribution of a second network former in silica gel matrix being investigated. The procedures for synthesizing noncrystalline gels/gel-monoliths in the SiO2-GeO2, GeO2-PbO systems were developed. Preliminary investigations on the levitation and thermal treatment of germania silicate gel-monoliths in the Pressure Facility Acoustic Levitator were done.

  7. Caracterização do Regime de Ventos no Piauí Para o Aproveitamento de Energia Eólica

    Directory of Open Access Journals (Sweden)

    Marcos Antonio Tavares Lira

    Full Text Available Resumo O presente estudo apresenta uma caracterização do regime de ventos em algumas regiões do estado do Piauí, realizada por meio da análise do perfil da velocidade média horária e mensal dos ventos bem como da freqüência da direção dos mesmos. O objetivo principal do trabalho é identificar possíveis sítios de geração de energia eólica no Piauí a partir do uso de uma ferramenta computacional: o software Windographer®. Utilizando-se a base de dados do ano de 2010 do Instituto Nacional de Meteorologia (INMET foram analisados os municípios de Valença, Floriano, Alvorada do Gurgueia, Oeiras, Caracol, São João do Piauí, Paulistana e Parnaíba. Para cada município são apresentados graficamente o regime de ventos horário e mensal bem como da sua direção predominante no período estudado. Os resultados mostraram que os municípios de Paulistana e Parnaíba se destacaram por apresentarem um potencial eólico satisfatório para o aproveitamento de energia elétrica.

  8. Applications of the renewable energies; Aplicaciones de las energias renovables

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Rocha, Luis Martin [Comision Nacional para el Ahorro de Energia, Mexico, D.F. (Mexico)

    2001-07-01

    The solar energy manifests itself in different forms and its application has been fundamental for the humankind development. These forms are known as renewable energies, since they are energy forms that are renewed or remade with time or that are so abundant on Earth, that they will last for hundreds or thousands of years, either we use them or not. The main advantage of the utilization of the renewable energies in comparison with hydrocarbons is the one of having smaller impact on the environment, which brings about the conservation of nonrenewable resources, and to postpone its exhaustion. They allow the distributed generation, diminishing the power losses in the transmission and distribution systems, which increases the overall efficiency. In addition they can be the drive for regional development and generation of employment, because when having applications in remote zones and being a field still not completely developed in Mexico, the possibility exists of enabling professionals and technicians. From the point of view of the power sector, the renewable energies extend the supply and availability of energy, making more flexible and independent the operation and reliability of the national power system. [Spanish] La energia solar se manifiesta de diversas formas y su aplicacion ha sido fundamental para el desarrollo de la humanidad. A estas formas se les conoce como energias renovables, ya que son formas de energia que se van renovando o rehaciendo con el tiempo o que son tan abundantes en la tierra, que perduraran por cientos o miles de anos, las usemos o no. La principal ventaja del aprovechamiento de las energias renovables en comparacion con los hidrocarburos es la de tener menor impacto al medio ambiente, lo que trae consigo la conservacion de recursos no renovables, y posponer su termino. Permiten la generacion distribuida, disminuyendo las perdidas energeticas en los sistemas de transmision y distribucion, lo que incrementa la eficiencia general. Ademas

  9. Asjatundja soovitab Eesti Energia kiiresti börsile viia / Tiit Nigul ; interv. Andrus Karnau

    Index Scriptorium Estoniae

    Nigul, Tiit

    2008-01-01

    Eesti Energia endine juhatuse liige vastab küsimustele, mis puudutavad riigi energiapoliitikat ja -varustust, elektrienergia hinnatõusu, energiafirma börsileminekut, tasakaalu konkurentsiameti ja Eesti Energia vahel, ettevõtte tulusid, Narva Elektrijaamade tootmisvõimsust, koostööd Leedu tuumajaama projektiga, elektriturgu, ettevõtja Urmas Sõõrumaa süüdistamist siseinfo kasutamises, Eesti Energia strateegilist eesmärki saavutada aastaks 2015 kaks miljonit klienti

  10. Analüütikud soovitavad Eesti Energia börsile viia / Piret Reiljan

    Index Scriptorium Estoniae

    Reiljan, Piret, 1983-

    2008-01-01

    Kohalikud analüütikud soovitavad viia Eesti Energia börsile, kuna see elavdaks aktsiaturgu ja tõmbaks ligi välisinvestoreid. Vt. samas: Raivo Vare: raske aeg töötab Eesti Energia börsiletoomise kasuks; Analüüs ootab pääsu valitsuskabinetti; Juhid ei püsi enam Eesti Energias. Diagrammid: Majandusnäitajad; Varade maht

  11. GelTouch

    DEFF Research Database (Denmark)

    Miruchna, Viktor; Walter, Robert; Lindlbauer, David

    2015-01-01

    We present GelTouch, a gel-based layer that can selectively transition between soft and stiff to provide tactile multi-touch feedback. It is flexible, transparent when not activated, and contains no mechanical, electromagnetic, or hydraulic components, resulting in a compact form factor (a 2mm thin...... touchscreen layer for our prototype). The activated areas can be morphed freely and continuously, without being limited to fixed, predefined shapes. GelTouch consists of a poly(N-isopropylacrylamide) gel layer which alters its viscoelasticity when activated by applying heat (>32 C). We present three different...

  12. Transport Phenomena in Gel

    OpenAIRE

    Masayuki Tokita

    2016-01-01

    Gel becomes an important class of soft materials since it can be seen in a wide variety of the chemical and the biological systems. The unique properties of gel arise from the structure, namely, the three-dimensional polymer network that is swollen by a huge amount of solvent. Despite the small volume fraction of the polymer network, which is usually only a few percent or less, gel shows the typical properties that belong to solids such as the elasticity. Gel is, therefore, regarded as a dilu...

  13. L'energia nuclear: pot resoldre el problema de l'escalfament global?

    OpenAIRE

    Puig, Josep

    2006-01-01

    Sovint es diu que l'energia nuclear pot ser la solució pel problema de l'escalfament global: l'article presenta dades i raonaments per concloure que, si tota l'electricitat mundial fos d'origen nuclear, l'escalfament global es reduiria tan sols en un 12%. També s'analitzen els subproductes militars de la indústria de l'energia nuclear "civil" i la problemàtica dels residus radioactius de l'energia nuclear de fissió. També s'analitza l'alt grau de dificultats que presenta l'energia nuclear de ...

  14. Geração de energia a partir das ondas do mar

    OpenAIRE

    Grilo, Diogo Dinis

    2013-01-01

    Dado o aumento do consumo de energia e a necessidade de reduzir as emissões de poluentes para a atmosfera, o presente trabalho visa propor uma solução de produção de energia limpa a partir das ondas do mar. O objetivo desta dissertação é criar um sistema alternativo de conversão da energia cinética proveniente das ondas do mar em energia elétrica, tendo como ponto de partida o projeto do sistema pendular SEAREV. Numa primeira fase foi realizada uma análise dos sistemas de co...

  15. Kätega ravimine ehk me kõik oleme energia / Kerttu Soans

    Index Scriptorium Estoniae

    Soans, Kerttu, 1961-

    2011-01-01

    Erinevatest energia vahendamisel põhinevatest psühhotehnikatest ja ravimeetoditest: reiki, Silva ultra, maagiline maatriks ehk MM, elektromagnetvälja tasakaalustamise tehnika EMF, kvantpuudutus, bioenergeetika

  16. O espaço da energia nuclear no Brasil

    Directory of Open Access Journals (Sweden)

    Joaquim Francisco de Carvalho

    2012-01-01

    Full Text Available Este artigo repassa a história e descreve a experiência acumulada em energia nuclear no Brasil, mostrando que as aplicações biomédicas, industriais e agrícolas desenvolveram-se bem no país, a partir dos anos 1950. Em seguida, o artigo demonstra que o país pode cobrir seu consumo de energia elétrica apenas com fontes renováveis de energia, sem recorrer a usinas nucleares de potência. Por fim, são analisados os argumentos comuns na imprensa, a favor e contrários às centrais nucleares, e são discutidos alguns aspectos comerciais e políticos do problema. São também examinadas as estratégias de vendas da indústria nuclear no Brasil.This article reviews the history and describes the experience on nuclear energy in Brazil, showing that nuclear technology applied to biomedical sciences, industry and agriculture has been largely developed in this country, from the year 1950 on. Then the paper shows that Brazil can cover its electricity consumption with only renewable energy sources, without nuclear power plants. Finally the arguments usually employed in the press, pro and against nuclear power plants are analyzed and some commercial and political aspects of the problem are commented. The sales strategy of the nuclear industry in Brazil is also commented.

  17. A pedagogia do conceito de energia: contributo para a utilização formativa do conceito de energia

    OpenAIRE

    Valente, Mariana de Jesus Pedreira

    1993-01-01

    Dissertação de mestrado em Ciências da Educação: área de Educação e Desenvolvimento Quando nasce um novo conceito é necessário um termo para o designar. O termo energia é utilizado para designar o conceito científico que emerge, a meados do século dezanove, com o estabelecimento do, então, Princípio de Conservacão da Força. Que relações se podem estabelecer entre o novo conceito e a ideia de energia que nos finais do século dezoito usufruía de tão grande sucesso? Na prime...

  18. Cyanocobalamin Nasal Gel

    Science.gov (United States)

    ... to supply extra vitamin B12 to people who need unusually large amounts of this vitamin because they are pregnant or have certain diseases. ... Cyanocobalamin nasal gel will supply you with enough vitamin B12 only as ... it regularly. You may need to use cyanocobalamin nasal gel every week for ...

  19. Eesti Energia senine juhatus jätkab veel vähemalt aasta / Anneli Ammas, Toivo Tänavsuu

    Index Scriptorium Estoniae

    Ammas, Anneli, 1962-

    2005-01-01

    Eesti Energia nõukogu otsustas jätta ettevõtte juhatuse veel aastaks ametisse, juhikonkursi korraldamise kohta otsust ei langetatud. Nõukogu liikmete kommentaare. Lisa: Eesti Energia kasvatas eksporti

  20. Modeling chemoresponsive polymer gels.

    Science.gov (United States)

    Kuksenok, Olga; Deb, Debabrata; Dayal, Pratyush; Balazs, Anna C

    2014-01-01

    Stimuli-responsive gels are vital components in the next generation of smart devices, which can sense and dynamically respond to changes in the local environment and thereby exhibit more autonomous functionality. We describe recently developed computational methods for simulating the properties of such stimuli-responsive gels in the presence of optical, chemical, and thermal gradients. Using these models, we determine how to harness light to drive shape changes and directed motion in spirobenzopyran-containing gels. Focusing on oscillating gels undergoing the Belousov-Zhabotinksy reaction, we demonstrate that these materials can spontaneously form self-rotating assemblies, or pinwheels. Finally, we model temperature-sensitive gels that encompass chemically reactive filaments to optimize the performance of this system as a homeostatic device for regulating temperature. These studies could facilitate the development of soft robots that autonomously interconvert chemical and mechanical energy and thus perform vital functions without the continuous need of external power sources.

  1. Energy of our planet; La energia de nuestro planeta

    Energy Technology Data Exchange (ETDEWEB)

    Torres Alvarado, Ignacio; Santoyo Gutierrez, Edgar [Centro de Investigacion en Energia (CIE) de la UNAM, Temixco, Morelos (Mexico)

    2010-07-01

    The total heat flowing from the Earth's interior to the surface is estimated at {approx}42 TW (1012 watts) of which 19% comes from the crust, the 76% comes from the mantle and the 5% comes from the nucleus. The ability to drive the heat of the rocks is very low, causing the need of hundreds of millions of years to exhaust this energy resource. Based on the properties of the renewable heat flow and the long geological times required for its exhaustion, the Earth energy is considered by many scientists as a source of inexhaustible renewable energy, and by its natural availability in all parts of our planet, perhaps the best distributed, together with solar energy. One of the most important advantages of geothermal energy is that its energy can be used not only to generate electric power, but in a large number of applications or direct uses: the heating of buildings, greenhouses or incubators; aquaculture; in various industrial processes (drying products, food packaging, paper manufacturing, chemicals, etc.); balneology for recreational purposes and medicines, and many other applications. In fact, geothermal applications can be integrally one after another or in processes in cascade to fully utilize its energy content. [Spanish] El calor total que fluye del interior de la Tierra hacia la superficie se estima en {approx}42 TW (1012 watts) del cual 19% proviene de la corteza, el 76% proviene del manto y el 5% proviene del nucleo. La capacidad para conducir el calor de las rocas es muy baja, lo que ocasiona que se necesiten cientos de millones de anos para agotar este recurso energetico. Basado en las propiedades renovables del flujo de calor y los largos tiempos geologicos requeridos para su agotamiento, la energia de la Tierra es considerada por muchos cientificos como una fuente de energia renovable, practicamente inagotable, y por su disponibilidad natural en todo nuestro planeta, quizas la mejor distribuida, junto con la energia solar. Una de las ventajas mas

  2. Eesti Energia nõukogu liikmed Jaotusvõrgu hinnatõusutaotlust kommenteerima ei kipu / Katre Pilvinski

    Index Scriptorium Estoniae

    Pilvinski, Katre

    2010-01-01

    Eesti Energia nõukogu liige Kalle Palling kommenteerib peaminister Andrus Ansipi öeldut, et Eesti Energia investeeringud tuleb üle vaadata. Nõukogu liikme Rein Kilgi sõnul tunduvad talle rünnakud Eesti Energia vastu ülekohtused

  3. Ülikoolihõnguline personalikoolitus Eesti Energias / Annika Kaseorg ; küsitlenud Kadri Kiigema

    Index Scriptorium Estoniae

    Kaseorg, Annika

    2007-01-01

    Eesti Energia alustatud uuest projektist "Nädalalõpu Ülikool" räägib Eesti Energia Jaotusvõrgu personali arendamise projektijuht Annika Kaseorg. Avaseminaril tegi ettekande töövõime säilitamisest TLÜ terviseteaduste ja spordi teaduskonna dekaan Kristjan Port

  4. Energia Renovable para Centros de Salud Rurales (Renewable Energy for Rural Health Clinics)

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez, T.; Olson, K.

    1999-07-28

    Esta es la primera de una serie de guias de aplicaciones que el Programa de Energia de Villas de NREL esta comisionando para acoplar sistemas comerciales renovables con aplicaciones rurales, incluyendo agua, escuelas rurales y micro empresas. La guia esta complementada por las actividades de desarrollo del Programa de Energia de Villas de NREL, proyectos pilotos internacionales y programas de visitas profesionales.

  5. Projecte d'implantació d'energia solar fotovoltaica al municipi d'Albanyà

    OpenAIRE

    Molins i Galas, Albert

    2008-01-01

    Disseny d’una instal·lació d’energia solar fotovoltaica per als edificis públics del municipi d’Albanyà (Alt Empordà) per connectar-la a la xarxa i amb un estudi sobre la substitució dels actuals fanals de l’enllumenat públic per fanals alimentats amb energia solar fotovoltaica

  6. Roheline energia läheb müüki topelthinnaga / Ervin Soon

    Index Scriptorium Estoniae

    Soon, Ervin

    2001-01-01

    Eesti Energia on märtsi keskel käivitanud Rohelise Energia kampaaniaga leidnud võtte, kuidas kaks korda kõrgema elektri müügihinnaga katta alternatiivenergia kohustusliku kokkuostu järjest kasvavaid kulusid

  7. Eesti Energia börsile! Argus riputaks ta meile kiviks kaela / Raimo Poom

    Index Scriptorium Estoniae

    Poom, Raimo

    2010-01-01

    Eesti Energia võimalikust börsileviimisest. Autori sõnul poleks börsikavagi täieliku riskita, peaküsimus võib hakata puudutama nn. rahvaaktsia kava. Kõige halvem oleks Eesti Energia puhul otsustamatus

  8. Eesti Energia juhi küsimus jäi ajapuudusel lahendamata / Villy Paimets

    Index Scriptorium Estoniae

    Paimets, Villy, 1972-

    2005-01-01

    Eesti Energia nõukogu jättis otsustamata, kas ettevõtte juhatuse esimehe kohale kuulutatakse välja avalik konkurss. Vt. samas: Oki valulaps on elektri hind; Kronoloogia: Eesti Energia on Gunnar Oki juhtimisel kõvasti kosunud

  9. Eesti Energia kärpis elektrihinna tõusu / Aivar Reinap

    Index Scriptorium Estoniae

    Reinap, Aivar, 1968-

    2004-01-01

    Ilmunud ka: Põhjarannik, 13. veebr. 2004, lk. 1. Eesti Energia nõukogu otsustas vähendada taotletavat elektrienergia hinnatõusu 15%ni ja lükkas hinnapakettide lõpliku kinnitamise edasi nädala võrra. Riigikogu ja Eesti Energia nõukogu liikme Janno Reiljani arvamus

  10. TTÜ energia- ja sisekliimalabor : energiasääst passiivse arhitektuurilise jahutuse ja/või küttemeetodite kavandamise abil / Hendrik Voll, Teolan Tomson

    Index Scriptorium Estoniae

    Voll, Hendrik, 1980-

    2010-01-01

    TTÜ ehitusteaduskonna kütte ja ventilatsiooni õppetoolis valmis energia- ja sisekliima labor, mille spetsiaalsed päikesekiirguse ja hajuvalguse stendid aitavad inseneridel ja arhitektidel parandada energiasimulatsiooniprogrammide kasutusoskusi

  11. GreenEnergy: produção de energia eléctrica a partir de fontes de energia renovável para sistemas de microprodução

    OpenAIRE

    Francisco, Carlos Manuel Mendes

    2013-01-01

    O uso de energias renováveis está cada vez mais presente no nosso quotidiano. A forte aposta por parte de várias empresas, grupos privados e habitações domésticas na produção de energia renovável tem vindo a crescer bastante nos últimos anos, porque além de ser uma energia limpa, é economicamente vantajosa. No âmbito residencial na Ilha da Madeira, tem havido um grande crescimento na microprodução de energia fotovoltaica. Para que se consiga converter energia garantindo os critéri...

  12. Periodic mesoporous silica gels

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, M.T.; Martin, J.E.; Odinek, J.G. [and others

    1996-06-01

    We have synthesized monolithic particulate gels of periodic mesoporous silica by adding tetramethoxysilane to a homogeneous alkaline micellar precursor solution. The gels exhibit 5 characteristic length scales over 4 orders of magnitude: fractal domains larger than the particle size (>500 nm), particles that are {approximately}150 to 500 nm in diameter, interparticle pores that are on the order of the particle size, a feature in the gas adsorption measurements that indicates pores {approximately}10-50 nm, and periodic hexagonal arrays of {approximately}3 nm channels within each particle. The wet gel monoliths exhibit calculated densities as low as {approximately}0.02 g/cc; the dried and calcined gels have bulk densities that range from {approximately}0.3-0.5 g/cc. The materials possess large interparticle ({approximately}1.0-2.3 cc/g) and intraparticle ({approximately}0.6 cc/g) porosities.

  13. Gel purification of RNA.

    Science.gov (United States)

    Nilsen, Timothy W

    2013-02-01

    For many applications, including size selection of RNAs and purification of in vitro transcription products, it is necessary to purify RNAs on a denaturing gel. This procedure describes how to purify transcripts that have been synthesized in vitro. It is useful for labeled or unlabeled RNAs when sufficient mass is present. It can also be used to isolate small RNAs. In general, RNA purification by denaturing gel electrophoresis is practical only when the size of the desired RNA is 600 nucleotides or less.

  14. Conformance Improvement Using Gels

    Energy Technology Data Exchange (ETDEWEB)

    Seright, Randall S.; Schrader, Richard; II Hagstrom, John; Wang, Ying; Al-Dahfeeri, Abdullah; Gary, Raven; Marin; Amaury; Lindquist, Brent

    2002-09-26

    This research project had two objectives. The first objective was to identify gel compositions and conditions that substantially reduce flow through fractures that allow direct channeling between wells, while leaving secondary fractures open so that high fluid injection and production rates can be maintained. The second objective was to optimize treatments in fractured production wells, where the gel must reduce permeability to water much more than that to oil.

  15. A proposal for the modular integration of the renewable energy sources, via hydrogen, and the Rankine power cycle; Una propuesta de integracion modular de las fuentes de energia renovables, via hidrogeno, y el ciclo de potencia Rankine

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Dirzo, Rafael

    2004-07-01

    This thesis synthesizes the state-of-the-art of the modular integration of the renewable energy sources and the Ranking power cycle. This is possible to obtain due to the development of the hydrogen production technologies and with it the chemical storage of the energies solar, Aeolian (wind) and tidal, among others. The purpose of this thesis is the assessment of hydrogen as fuel, its obtaining through the breaking of the water molecule using the renewable energies and the thermodynamic analysis of two prototypes for its energy conversion into electricity and power, voltage and fixed frequency: the first one at laboratory scale of 800 W and the second one, on industrial scale of 1 GW of power. Included here is the synthesis of the increasing bibliography on the development of the hydrogen technologies and the renewable energies, passing through the mass and energy balance in the power cycles until proposing, at the level of Process Flow Charts of the results of the proposed prototypes. The products show the possibility of constructing and operating the experimental prototype, whereas the thermodynamic analysis suggests that the industrial prototype is viable. The economic analysis of both proposals is part of a doctorate project in process. [Spanish] Esta tesis sintetiza el estado del arte de la integracion modular de las fuentes de energia renovables y el ciclo de potencia Ranking. Esto es posible lograrlo debido al desarrollo de las tecnologias de produccion de hidrogeno y con ello el almacenamiento quimico de las energias solar, eolica y maremotriz, entre otras. Es objetivo de esta tesis la valoracion del hidrogeno como combustible, su obtencion a traves del rompimiento de la molecula del agua utilizando las energias renovables y el analisis termodinamico de dos prototipo para su conversion energetica en electricidad a potencia, voltaje y frecuencia fijos: el primero a escala de laboratorio de 800 W y el segundo, a escala industrial de 1 GW de potencia. Se

  16. Tidal power plant energy estimation; Cuantificacion de energia de una planta mareomotriz

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Gonzalez, J.; Hiriart Le Bert, G.; Silva Casarin, R. [Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico (mexico)]. E-mail: JlopezGo@iingen.unam.mx; gerardo367@yahoo.com.mx; RSilvaC@iingen.unam.mx

    2010-04-15

    In this paper a methodology is presented which allows a quick and simple means of estimating the potential energy that can be obtained from a tidal power plant. The evaluation is made using a normalised nomograph, which is a function of the area of the tidal basin against the electricity installed capacity to thus obtain the potential energy for any location. The results describe two means of operation, one of flow tide and the other flow-ebb tides, with two tidal basin systems operating: single and double reservoir systems. To obtain the normalised nomograph the numerical results for simulations of several tidal power plants under differing operational conditions over a period of one year. These conditions were established by varying the electricity installed capacity, the hydraulic conditions in flow tide, ebb tides or both and with single or double reservoir systems and using sea level information taken every 15 minutes. To validate the model information from the tidal power plant at Rance, France, was used, which includes data concerning production, electricity installed capacity, turbine characteristics and tidal ranges. A very good correlation was found between the results of the numerical model and those reported in various technical reports. [Spanish] Se presenta una metodologia que permite estimar de manera rapida y sencilla el potencial de energia que puede ser extraido a traves de una planta mareomotriz. La evaluacion se realiza utilizando un nomograma normalizado que es funcion del area del embalse versus la capacidad electrica instalada, para asi obtener el potencial energetico en una zona en particular. Los resultados contemplan dos formas de operacion, una llamada en flujo y otra en flujo-reflujo, dos esquemas de embalse (sencillo y doble embalse). Para la elaboracion del nomograma normalizado se utilizaron resultados numericos de la simulacion de multiples plantas mareomotrices bajo diferentes escenarios durante un ano de operacion. Los escenarios

  17. Active Polymer Gel Actuators

    Directory of Open Access Journals (Sweden)

    Shuji Hashimoto

    2010-01-01

    Full Text Available Many kinds of stimuli-responsive polymer and gels have been developed and applied to biomimetic actuators or artificial muscles. Electroactive polymers that change shape when stimulated electrically seem to be particularly promising. In all cases, however, the mechanical motion is driven by external stimuli, for example, reversing the direction of electric field. On the other hand, many living organisms can generate an autonomous motion without external driving stimuli like self-beating of heart muscles. Here we show a novel biomimetic gel actuator that can walk spontaneously with a wormlike motion without switching of external stimuli. The self-oscillating motion is produced by dissipating chemical energy of oscillating reaction. Although the gel is completely composed of synthetic polymer, it shows autonomous motion as if it were alive.

  18. Minema kupatatud nõukoguliikmed: Eesti Energia projektid kukkusid läbi / Dannar Leitmaa

    Index Scriptorium Estoniae

    Leitmaa, Dannar, 1982-

    2011-01-01

    Majandus- ja kommunikatsiooniminister Juhan Parts otsustas Eesti Energia nõukogu liikme kohalt tagasi kutsuda Aivar Reiviku ning Rein Kuusmiku, kes olid vastu Eesti Energia üle viie miljoni euro suurusele investeeringule Weroli rapsiõlitehase juurde rajatavasse elektri- ja küttejaama. Uuteks nõukogu liikmeteks said Andres Saame ja Toomas Tauts. Majandus- ja kommunikatsiooniministeerium peab tagandatud nõukoguliikmete väiteid, et Eesti Energia juhtkond käitub omanikust riigiga omatahtsi ja peab endiselt plaani siirduda börsile, absurdiks. Ministeerium: ei mingit IPO-t

  19. 3D MR gel dosimetry with lung equivalent gel; 3D MR-Gel-Dosimetrie mit lungenaequivalentem Gel

    Energy Technology Data Exchange (ETDEWEB)

    Scherer, J.; Solleder, M.; Schiessl, I.; Bogner, L.; Herbst, M. [Klinik und Poliklinik fuer Strahlentherapie und Radioonkologie, Regensburg Univ. (Germany)

    1998-12-31

    The MR gel dosimetry is used to verify complex 3D treatment plans. Till now this method served only for dose evaluation in homogeneous phantoms. On the way to build a heterogeneous anthropomorphic gel phantom, a lung equivalent gel with the density 0.4 g/cm{sup 3} was developed. First experiments show a 1.55 times higher dose reponse in the low density gel (LD gel). The comparison of a dose distribution in a gel/LD gel/gel slab phantom with Monte Carlo calculations shows good agreement within 5%. More over the accuray of the measuring device magnetic resonance imager was studied in respect to the now exclusive digital image processing with the software MRD (MR dosimetry). Because of the dimensions of the Fricke gel phantom an artefact correction, based on the data from the unirradiated phantom proved to be essential. (orig.) [Deutsch] Die MR-Gel-Dosimetrie zur Verifikation komplexer 3D-Bestrahlungsplaene wurde bislang ausschliesslich in homogenen Phantomen durchgefuehrt. Auf dem Wege zum Bau eines inhomogenen Humanoid-Gel-Phantoms wurde ein lungenaequivalentes Gel mit der Dichte 0,4 g/cm{sup 3} entwickelt. Erste Messungen zeigen ein um den Faktor 1,55 hoeheres Ansprechvermoegen in dem low-density-Gel (LD-Gel). Der Vergleich einer gemessen Dosisverteilung in einem Gel/LD-Gel/Gel Schichtphantom als einfaches Thoraxmodell mit Monte-Carlo-Rechnungen zeigt eine gute Uebereinstimmung innerhalb 5%. Ausserdem wurden Untersuchungen zur Messgenauigkeit des Kernspintomographen im Rahmen der nun ausschliesslich digitalen Auswertung mit Hilfe des Programms MRD (MR-Dosimetrie) durchgefuehrt. Es zeigt sich, dass eine Artefaktkorrektur auf der Basis einer Messung des unbestrahlten Phantoms bei grossen Fricke-Gel-Phantomen notwendig ist. (orig.)

  20. Desenvolvimento de compósitos poliméricos baseados em polipropileno reciclado visando o uso como placas absorvedoras de energia solar

    Directory of Open Access Journals (Sweden)

    Leonardo Azevedo Massulo

    2016-06-01

    Full Text Available Devido à crescente demanda por energias sustentáveis, gestão de resíduos e o uso de materiais recicláveis, o presente trabalho objetivou o desenvolvimento de compósitos poliméricos de matriz de polipropileno reciclado visando o uso como placas absorvedoras de energia solar. Nessa matriz polimérica adicionou-se como fase dispersa um resíduo do tabaco (pó de fumo empregando teores de 10%, 15%, 20%, 25% e 30%, em massa. Além disso, estudou-se a adição de negro de fumo junto ao pó de fumo, utilizando teores de 6% e 10% de cada fase dispersa. As formulações foram misturadas em homogeneizador de laboratório, moídas em moinhos de facas e processadas por moldagem por compressão a 180°C, obtendo-se placas com dimensões de 400x400mm e espessura de 4 mm, as quais, foram caracterizadas e avaliadas em testes de absorção de calor, tração, flexão, dureza e densidade. Os resultados indicaram potencial de aplicação no sistema de aquecimento solar de água devido aos resultados de absorção térmica. Também, a utilização do negro de fumo como fase dispersa mostrou-se uma grande contribuição para as características mecânicas do material. Outro importante resultado diz respeito a possibilidade de se estar usando um polímero reciclado e um resíduo industrial gerado em grande quantidade, tal como é o pó de fumo, na produção das placas caracterizando assim um ganho ambiental.

  1. Energia solar no tratamento de corante têxtil

    Directory of Open Access Journals (Sweden)

    Viviane Farias Silva

    2014-10-01

    Full Text Available As indústrias utilizam a água em todo o seu processo, desperdiçando enormes volumes de água gerando efluentes com altos índices de produtos químicos, precisando de tratamento para ser reutilizado ou lançado no meio ambiente. Nesse contexto, o presente trabalho foi realizado no Laboratório de Engenharia Ambiental e de Qualidade na Universidade Federal de Pernambuco objetivando-se a degradação de corante utilizados nas indústrias têxtis através do uso da energia solar como alternativa de tratamento de efluente. Nesta pesquisa os testes fotocatalíticos foram realizados com o catalisador em pó (TiO2 - P25, contendo o corante têxtil Remazol Amarelo Ouro RNL (RGY ou sem catalisador nos testes de fotólise. Foram testados dois tipos de radiação, a artificial e a energia solar (natural. Para avaliar a descoloração e a degradação das amostras, a Espectroscopia UV-visível foi a principal técnica analítica empregada como também realizadas análises de Carbono Orgânico Total (COT e Demanda Química de Oxigênio (DQO. Nas 6 (seis analises realizadas obteve-se um elevado índice de remoção da cor do corante, superior a 97%, com alta eficiência do processo com uma significativa redução da COT e da DQO. Os métodos utilizados foram eficientes na descoloração do RGY, como também na sua degradação, tornando-se uma técnica inovadora com o uso da energia solar para o tratamento de efluentes têxteis.Palavras-chave: efluente industrial, alternativa sustentável, degradação do remazol amarelo ouro, descoloração de efluente

  2. based gel polymer electrolytes

    Indian Academy of Sciences (India)

    Bull. Mater. Sci., Vol. 29, No. 7, December 2006, pp. 673–678. © Indian Academy of Sciences. 673. Investigation on poly (vinylidene fluoride) based gel polymer electrolytes ... (Alamgir and Abraham 1993; Sukeshini et al 1996; Ra- jendran and Uma ... Yang et al 1996; Ramesh and Arof 2001) and such elec- trolytes exhibit ...

  3. gel template method

    Indian Academy of Sciences (India)

    TiO2 nanotubes have been synthesized by sol–gel template method using alumina membrane. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, UV absorption spectrum and X-ray diffraction techniques have been used to investigate the structure, morphology and optical ...

  4. A divulgação da informação ambiental : um estudo com empresas do setor de energia elétrica do Brasil e da Península Ibérica

    OpenAIRE

    Carneiro, Célia Maria Braga

    2013-01-01

    Tese de doutoramento em Gestão de Empresas (Contabilidade), apresentada à Faculdade de Economia da Universidade de Coimbra A divulgação ambiental tem sido ampliada de forma voluntária ou obrigatória no âmbito mundial, desde a década de 1990. Os principais meios para divulgar são o relatório ambiental ou de sustentabilidade e a Internet. No setor de energia elétrica, no Brasil e na Península Ibérica, as empresas fazem divulgação voluntária utilizando as orientações internacionai...

  5. Determinação do excesso da energia livre de gibbs de sistemas do tipo n-hexano/alcool alifatico na faixa de 323,15 a 348,15 K e de 30 a 130 KPa

    OpenAIRE

    Maria Regina Wolf Maciel

    1985-01-01

    Resumo: O propósito principal deste trabalho foi o de se determinar o excesso da energia livre de Gibbs, de sistemas binários, do tipo n-hexano/álcool alifático, através de medidas isotérmicas do equilíbrio de fases liquido-vapor, utilizando-se um aparelho de recirculação. A escolha dos sistemas foi feita ele modo a permitir um estudo sistemático no comportamento da grandeza excesso relativamente ao número de átomos de carbono do álcool, posição do radical OH- e temperatura, com um mesmo solv...

  6. Energia ja sisekliima labor aitab parandada arhitektide ja inseneride koostööd / Hendrik Voll

    Index Scriptorium Estoniae

    Voll, Hendrik, 1980-

    2010-01-01

    TTÜ ehitusteaduskonna kütte ja ventilatsiooni õppetoolis valmis energia ja sisekliima labor, mille spetsiaalsed päikesekiirguse ja hajuvalguse stendid aitavad inseneridel ja arhitektidel parandada energiasimulatsiooniprogrammide kasutusoskusi

  7. Relação massa-energia com conhecimentos do ensino médio

    OpenAIRE

    Palandi, Joecir

    2013-01-01

    Neste trabalho é apresentada uma proposta para discutir a relação massa-energia com os conhecimentos de Física Clássica que já compõem o currículo da escola de ensino médio. A discussão pode ter a seguinte seqüência: propriedades da radiação eletromagnética, momentum da radiação eletromagnética, relação massa-energia e discussão de um exemplo. Além da demonstração da relação massa-energia, a seqüência demanda também a demonstração da relação momentum-energia. Essa demonstração, encontrada em ...

  8. Eesti Energia korraldas OSELCA projekti raames Tallinnas rahvusvahelise seminari / Reigo Lehtla

    Index Scriptorium Estoniae

    Lehtla, Reigo

    2005-01-01

    Eesti Energia AS korraldas 12.-13. septembrini 2005. a. Tallinna Tehnikaülikooli energeetikahoones rahvusvahelise seminari olelusringi hindamise (Life Cycle Assessment) metoodika hetkeseisust Ida-Euroopa regioonis

  9. The Ciudad Universitaria and the energy; La ciudad universitaria y la energia

    Energy Technology Data Exchange (ETDEWEB)

    Arriola Valdes, Eduardo; Villanueva Moreno, Carlos; Alvarez Watkins, Pablo [Universidad Nacional Autonoma de Mexico (UNAM), Mexico, D.F. (Mexico)

    2006-08-15

    The fundamental intention of the macro project La Ciudad Universitaria y la Energia is to turn to the university campus of the Universidad Nacional Autonoma de Mexico (UNAM) into a model of intelligent use of the different necessary forms of energy for the satisfaction of its necessities. In order to do so, the macro project is sustained in six lines of investigation and development: Solar energy, energy from biomass; hydrogen energy; diagnosis and energy saving; use and energy saving; and energy culture. The macro project is framed in an effort of the UNAM to foment the trans-disciplinary collaboration and therefore, under the coordination of the Faculty of Engineering the following university dependencies participate in this persistence: Faculty of Sciences; Faculty of Chemistry; Faculty of Architecture; Faculty of Accountants and Administration; Faculty of Economy; FES Aragon; Institute of Engineering; Institute of Geophysics; Institute of Physics; Research Center in Energy; Center of Applied Sciences and Technological Development. For that intention, in the period the 2005-2007 the Trans-disciplinary Program in Investigation and Development for Faculties and Schools of the UNAM will contribute with 30 million pesos to the macro project La Ciudad Universitaria y la Energia. [Spanish] El proposito fundamental del macroproyecto La Ciudad Universitaria y la Energia es el convertir al campus universitario de la Universidad Nacional Autonoma de Mexico (UNAM) en un modelo de utilizacion inteligente de las diferentes formas de energia necesarias para la satisfaccion de sus necesidades. Para lograrlo, el macroproyecto se sustenta en las seis lineas de investigacion y desarrollo: Energia solar, energia de biomasa; energia del hidrogeno; diagnostico y ahorro de energia; utilizacion y ahorro de energia; y cultura energetica. El macroproyecto se enmarca en un esfuerzo de la UNAM por fomentar la colaboracion transdisciplinaria y por tanto, bajo la coordinacion de la Facultad

  10. Ingestão de energia e nutrientes por adolescentes de uma escola pública Nutrient and energy intake in adolescents from a public school

    Directory of Open Access Journals (Sweden)

    Renata Doratioto Albano

    2001-12-01

    Full Text Available OBJETIVO: avaliar o consumo médio alimentar de energia, de proteína, de cálcio, de ferro, e de vitaminas A e C de adolescentes. MÉTODOS: estudo transversal em uma escola pública de ensino fundamental e médio, no município de São Paulo, com 92 alunos, de ambos os sexos, entre 11 e 17 anos, do ensino fundamental, em 1998. A amostra foi selecionada utilizando-se um procedimento sistemático, com intervalo 2, de acordo com a série e sexo. Os dados de consumo alimentar foram coletados através do recordatório de 24 horas e comparados com as recomendações preconizadas pelo National Research Council de 1989. RESULTADOS: os consumos médios de energia, de proteínas e de vitamina C, para ambos os sexos, ultrapassaram a recomendação. O consumo médio de ferro para o sexo masculino ultrapassou a recomendação e, para o feminino, atingiu mais que 80%. O consumo médio de cálcio para o sexo masculino atingiu menos que 70% da recomendação e para o feminino, menos que 50%. CONCLUSÕES: pode-se concluir que os principais problemas detectados foram o baixo consumo médio de cálcio e elevado consumo de energia.OBJECTIVE: to assess the average intake of energy, protein, calcium, iron, vitamins A and C in adolescents. METHODS: cross-sectional study in a high school in São Paulo, Brazil, with 92 students, both males and females, aged between 11 and 17. The sample was chosen by a systematic statistical selection. The food intake was determined by 24-h diet recall and compared with the National Research Council recommendation (1989. RESULTS: the average intake of energy, proteins and vitamin C by both males and females was higher than the recommendation. The average iron intake by males was higher than the recommendation and more than 80% in females. The average calcium intake by males was less than 70% and less than 50% in females. CONCLUSIONS: low average intake of calcium and high average intake of energy were observed.

  11. Aquisição de energia no mercado cativo brasileiro: simulações dos efeitos da regulação sobre o risco das distribuidoras

    Directory of Open Access Journals (Sweden)

    Mônica Barros

    2009-08-01

    Full Text Available O novo ambiente regulatório da energia elétrica no Brasil introduziu grandes mudanças na área de comercialização. Principalmente a adoção dos leilões de compra centralizada nos quais o governo adquire energia para os consumidores cativos. Nesse novo quadro institucional, as distribuidoras têm a responsabilidade de estimar a energia requerida para atendimento de suas áreas de concessão e são punidas caso cometam erros de previsão. As estimativas a menor são mais duramente punidas. Neste trabalho foram feitas simulações dos custos de contratação utilizando como aleatórios os percentuais de contratação da demanda prevista e um modelo de reamostragem do PLD (Preço de Liquidação das Diferenças, empregado no cálculo das punições. Concluiu-se que o sistema é frágil porque modificações no conjunto de usinas considerado pelo software NEWAVE (que determina os CMOs - Custos Marginais de Operação e, indiretamente, os PLDs levam a resultados muito diferentes no que diz respeito ao valor das punições para uma mesma estratégia de contratação adotada por uma distribuidora.The new regulatory framework in Brazilian electricity sector implemented several changes in the way energy is traded. Energy required by all captive consumers is now centrally purchased by the government. Distributors are only responsible for demand estimation in their concession areas. In case estimations prove wrong, distributors are punished differently for under or overestimations. Underestimations are punished harder. In this paper we simulate energy purchasing costs for a hypothetical utility in which random percentages of the forecasted demand are used. We also develop a resampling scheme for the PLD (Settlement Price, which is used to calculate penalties incurred by utilities. We conclude that, despite a very sophisticated regulatory framework, the system is fragile because changes in the inputs of the NEWAVE software (used to calculate the

  12. Russian RSC Energia employees inspect DM in SSPF

    Science.gov (United States)

    1995-01-01

    Employees of the Russian aerospace company RSC Energia prepare to conduct final inspections of the Russian-built Docking Module in the Space Station Processing Facility at KSC. The module will fly as a primary payload on the second Space Shuttle/Mir space station docking mission, STS-74, which is now scheduled for liftoff in the fall of 1995. During the mission, the module will first be attached with the orbiter's robot arm to the Orbiter Docking System (ODS) in the payload bay of the orbiter Atlantis and then be docked with the Mir. When Atlantis undocks from the Mir, it will leave the new docking module permanently attached to the space station for use during future Shuttle Mir docking missions. The new module will simplify future Shuttle linkups with Mir by improving orbiter clearances when it serves as a bridge between the two space vehicles.

  13. Russian RSC Energia employees attach trunnions to DM

    Science.gov (United States)

    1995-01-01

    Employees of the Russian aerospace company RSC Energia attach trunnions to the Russian-built docking module in the Space Station Processing Facility at KSC so that it can be mounted in the payload bay of the Space Shuttle orbiter Atlantis. The module will fly as a primary payload on the second Space Shuttle/Mir space station docking mission, STS-74, which is now scheduled for liftoff in the fall of 1995. During the mission, the module will first be attached with the orbiter's robot arm to the Orbiter Docking System (ODS) in the payload bay of the orbiter Atlantis and then be docked with the Mir. When Atlantis undocks from the Mir, it will leave the new docking module permanently attached to the space station for use during future Shuttle Mir docking missions. The new module will simplify future Shuttle linkups with Mir by improving orbiter clearances when it serves as a bridge between the two space vehicles.

  14. EL ALTO MAGDALENA- COLOMBIA DE LA MANO CON ENERGIAS ALTERNATIVAS

    Directory of Open Access Journals (Sweden)

    Barragán-Alturo, Ancízar

    2013-12-01

    Full Text Available El afán por destruir un paradigma, que mantiene encadenados a los habitantes de Girardot y la región, a una compañía de distribución de la energía eléctrica con sus altos precios para el kilowatt-hora, ha inspirado la investigación CUNDINAMARCA DE LA MANO DE LAS ENERGIAS ALTERNATIVAS, demostrando por diversos caminos que el montaje de paneles solares para generación de energía eléctrica en las cubiertas de las casas es la energía alternativa para la solución de diversos problemas, entre ellos: los costos elevados, las fluctuaciones de voltaje, los cortes de energía, los daños en los electrodomésticos

  15. Eesti Energia kuulutas naabritele elektrisõja / Toivo Tänavsuu

    Index Scriptorium Estoniae

    Tänavsuu, Toivo

    2008-01-01

    Eesti Energia plaanib Läti ja Leedu kohtusse anda, kui läbirääkimised ei too lahendust. Sandor Liive peab oluliseks, et EL kehtestaks tollimaksu Vene elektrile. Käimas on lobitöö Põhjamaade elektribörsi laiendamiseks Eestisse 2009. aastast, mis tooks siia avatud turu läbipaistva hinnakujunduse; peetakse reaalseks, et Eesti Energia võib saada äriosaluse kavandatavas Olkiluoto 6. reaktoris. Lisa: Elektri hind võib 1. jaanuarist kahekordistuda

  16. Energy saving programs and renewable energies in Chihuahua, Mexico; Programas de ahorro de energia y energias renovables en Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Ibarra Noris, Jose Luis [Gobierno del Estado de Chihuahua (Mexico)

    2005-07-01

    The high index of economic and technological growth registered in the border zone of northern Mexico in the last years, has simultaneously caused an annual growth in the electrical energy demand in a percentage higher than 6%. In this document are included the economic and environmental impacts caused by the projects developed in the Chihuahua State on energy efficiency and on the available potential of renewable energies. In order to evaluate the environmental impact that is caused when saving electrical energy in the diverse projects in process, the emission of CO{sub 2} is the only emission taken into account (even though also emissions of SO{sub 2}, NO{sub 2} and Hg exist) for being this polluting agent the one that contributes in greater amount to the global warming and the greenhouse effect. The emission index of CO{sub 2} that we considered in this presentation is of 600 kg/mwh, on the basis of the type of fuel and volume of generation of the plants in operation of the Comision Federal de Electricidad (CFE) in the Chihuahua State. [Spanish] El alto indice de crecimiento economico y tecnologico registrado en la zona fronteriza del norte de Mexico en los ultimos anos, ha ocasionado paralelamente un crecimiento en la demanda de energia electrica superior al 6% anual. En este documento se incluyen los impactos economicos y ambientales de los proyectos que se desarrollan en el estado de Chihuahua en eficiencia energetica y en el potencial que se tiene de energias renovables. Para evaluar el impacto ambiental que se obtiene al ahorrar energia electrica en los diversos proyectos en proceso, se toma en cuenta unicamente emisiones de CO{sub 2} (aun cuando tambien existen emisiones de SO{sub 2}, NO{sub 2} y Hg) por ser este el contaminante que en mayor cantidad afecta al calentamiento global y al efecto invernadero. El indice de emisiones de CO{sub 2} que consideramos en esta presentacion es de 600 kg/mwh, en base al tipo de combustible y volumen de generacion de las

  17. PERSPECTIVAS DE INSERÇÃO DA ENERGIA SOLAR FOTOVOLTAICA NA GERAÇÃO DE ENERGIA ELÉTRICA NO RIO GRANDE DO NORTE

    Directory of Open Access Journals (Sweden)

    Augusto César Fialho Wanderley

    2013-08-01

    Full Text Available A geração de energia elétrica no Brasil é predominantemente renovável, com a geração interna hidráulica sendo superior a 74% do total de sua matriz energética. O racionamento de energia elétrica ocorrido em 2001, devido à falta de chuvas, levou o país a incrementar a participação de fontes alternativas de energia. Esta necessidade por novas fontes de energia faz com que as potencialidades regionais sejam aproveitadas, o que configura a mudança do modelo de geração, passando de geração centralizada para geração distribuída. Dentre as fontes alternativas de energia, a solar apresenta-se como uma fonte bastante promissora para o Brasil, tendo em vista que a maior parte do seu território está localizada próximo à linha do equador, o que acarreta em um dia de maior duração solar. O Rio Grande do Norte (RN tem um dos maiores índices de incidência solar do território brasileiro, o que o torna apto a receber investimentos para a instalação de usinas solares fotovoltaicas. Este artigo analisará o potencial de geração da energia solar fotovoltaica no RN através de medições solarimétricas realizadas em Natal, capital do estado.

  18. Energy saving plan: use of solar energy in the university of Valencia (Spain); Uso de la energia solar en la universidad de Valencia (Espana) para ahorrar energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Gomez Amo, J.L.; Tena, F.; Martinez Lozano, J.A.; Utrillas, M.P. [Grupo de Radiacion Solar, Universidad de Valencia (Spain)

    2005-07-15

    The University of Valencia financed a pilot project that would study the installation's feasibility of a generating station with photovoltaic energy, solar type, in order to replace or complement conventional sources of energy. This paper presents some of the preliminary results of the study's application in an University building, along with the analysis of the initial situation and the proposals for the handling of reactive energy and the outer and inner lighting as solutions for energy saving. This experimental project entitled Study of the Energy Saving Strategies and the Viability of Installing Solar Energy equipment in the Buildings of the University of Valencia throws preliminary data specifying the amount of investment necessary to obtain real annual benefits, as well as the recovery time of the investment and the beneficial ecological impact in quantitative terms of a measurable CO{sub 2} reduction. [Spanish] La Universidad de Valencia financio un proyecto piloto que estudiaria la factibilidad de instalacion de una estacion generadora de energia fotovoltaica de tipo solar para sustituir o complementar fuentes convencionales de energia. Este trabajo presenta algunos de los resultados preliminares de la aplicacion del estudio en un edificio de la Universidad junto con el analisis de la situacion inicial y las propuestas del manejo de energia reactiva, de iluminacion exterior e interior como soluciones para el ahorro de energia. Este proyecto experimental titulado Estudio de las estrategias del ahorro de la energia y de la viabilidad de instalar energia solar en los edificios de la Universidad de Valencia arroja datos preliminares que especifican el monto de la inversion necesaria para obtener beneficios anuales reales, asi como el tiempo de recuperacion de la inversion y el impacto ecologico benefico en terminos cuantitativos de una reduccion cuantificable de CO{sub 2}.

  19. Heat pumping using the thermal earth gradient to produce air conditioned and hot water with savings of up to 70%; Bombeo de calor utilizando el gradiente termico de la tierra para producir aire acondicionado y agua caliente con ahorros de hasta un 70%

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez Ramirez, Alejandro [Novaenergia de Mexico S.A. de C.V. (Mexico)

    2003-07-01

    The pumping of heat using the Earth heat as partial energy source bases its principle on which the energy of the ground is constant and the energy efficiency to produce air conditioning and hot water simultaneously is important, obtaining savings up to 70%, comparing itself with the traditional equipment and what these operate of separated way to produce each one of them the cold air and the hot water. The use of this technology presents an opportunity to reduce the energy costs of and the demand of the company. [Spanish] El bombeo de calor utilizando el calor de la tierra como fuente parcial de energia basa su principio en que la energia del suelo es constante y el rendimiento energetico para producir simultaneamente aire acondicionado y agua caliente es importante, obteniendose ahorros hasta de un 70%, comparandose con los equipos tradicionales y que estos operan de manera separada para producir cada uno de ellos el aire frio y el agua caliente. El uso de esta tecnologia presenta una oportunidad para reducir los costos de energia y demanda de la empresa.

  20. Analytical study of the prospectives published by the Secretaria de Energia; Estudio analitico de las prospectivas publicadas por la Secretaria de Energia

    Energy Technology Data Exchange (ETDEWEB)

    Beltran Mora, Hector Alejandro; Urias Romero, Francisco [Facultad de Ingenieria, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2004-06-15

    Since 1997 the Secretaria de Energia (SENER) publishes an annual report named Prospectiva del Sector Electrico, in which detailed information on the situation of the Mexican electrical sector is included, the information is related to the technological, economic and environmental aspects of all the organisms involved in the matter of electrical energy, within which stand out the Comision Federal de Electricidad (CFE), Luz y Fuerza del Centro (LyFC), the Comision Reguladora de Energia (CRE) and the Comision Nacional para el Ahorro de Energia (CONAE). In the prospectives the tendency of the modifications that will undergo the sector in a period of 10 years is analyzed. All the prospectives of the electrical sector, agree in that the growth of this sector is determined by the construction of power stations that use natural gas as primary energy, reason why we made an analysis of the prospectives of the natural gas market, with the purpose of observing the interaction between both sectors. At the moment seven prospectives of each sector have been published, given the conditions at the moment of their publication, they present differences and agreements between each other for periods of intersection. The present work shows the comparison between the expectations of growth reported by each one of the Prospectives. [Spanish] Desde 1997 la Secretaria de Energia (SENER) publica un reporte anual llamado Prospectiva del Sector Electrico, en el que se incluye informacion detallada sobre la situacion del sector electrico mexicano, la informacion esta relacionada con los aspectos tecnologicos, economicos y medioambientales de todos los organismos involucrados en materia de energia electrica, dentro de los cuales destacan la Comision Federal de Electricidad (CFE), Luz y Fuerza del Centro (LyFC), la Comision Reguladora de Energia (CRE) y la Comision Nacional para el Ahorro de Energia (CONAE). En las prospectivas se analiza la tendencia de las modificaciones que sufrira el sector

  1. Biopolymer gels containing fructooligosaccharides.

    Science.gov (United States)

    Silva, Karen Cristina Guedes; Sato, Ana Carla Kawazoe

    2017-11-01

    The influence of the addition of fructooligosaccharide (FOS) in an external gelated alginate/gelatin biopolymer matrix, was evaluated in order to produce biopolymeric structures with functional effects. Solutions were characterized regarding their rheological properties, macrogels regarding their microstructure and mechanical properties and microgels were characterized in relation to their particle size distribution and morphology. Close relationship was found between the microstructure, rheological and mechanical properties of the biopolymeric systems. An increased viscosity and accentuated elastic and pseudoplastic behavior were associated to denser microstructures. The FOS addition caused changes in the evaluated properties, resulting in more cohesive structures, with smaller pores and higher viscosity, compared to alginate-gelatin gels. The addition of 3% FOS to biopolymeric system provided an optimal condition, allowing the formation of stronger gels, with smaller pores and beads with smaller sizes, indicating the potential use of these functional systems as texture modifiers or encapsulation systems. Copyright © 2017 Elsevier Ltd. All rights reserved.

  2. Chiromagnetic nanoparticles and gels

    Science.gov (United States)

    Yeom, Jihyeon; Santos, Uallisson S.; Chekini, Mahshid; Cha, Minjeong; de Moura, André F.; Kotov, Nicholas A.

    2018-01-01

    Chiral inorganic nanostructures have high circular dichroism, but real-time control of their optical activity has so far been achieved only by irreversible chemical changes. Field modulation is a far more desirable path to chiroptical devices. We hypothesized that magnetic field modulation can be attained for chiral nanostructures with large contributions of the magnetic transition dipole moments to polarization rotation. We found that dispersions and gels of paramagnetic Co3O4 nanoparticles with chiral distortions of the crystal lattices exhibited chiroptical activity in the visible range that was 10 times as strong as that of nonparamagnetic nanoparticles of comparable size. Transparency of the nanoparticle gels to circularly polarized light beams in the ultraviolet range was reversibly modulated by magnetic fields. These phenomena were also observed for other nanoscale metal oxides with lattice distortions from imprinted amino acids and other chiral ligands. The large family of chiral ceramic nanostructures and gels can be pivotal for new technologies and knowledge at the nexus of chirality and magnetism.

  3. Polyacrylamide gel electrophoresis of RNA.

    Science.gov (United States)

    Rio, Donald C; Ares, Manuel; Hannon, Gregory J; Nilsen, Timothy W

    2010-06-01

    Perhaps the most important and certainly the most often used technique in RNA analysis is gel electrophoresis. This technique is generally applicable for RNA detection, quantification, purification by size, and quality assessment. Because RNAs are negatively charged, they migrate toward the anode in the presence of electric current. The gel acts as a sieve to selectively impede the migration of the RNA in proportion to its mass, given that its mass is generally proportional to its charge. Because mass is approximately related to chain length, the length of an RNA is more generally determined by its migration. In addition, topology (i.e., circularity) can affect migration, making RNAs appear longer on the gel than they actually are. Gels are used in a wide variety of techniques, including Northern blotting, primer extension, footprinting, and analyzing processing reactions. They are invaluable as preparative and fractionating tools. There are two common types of gel: polyacrylamide and agarose. For most applications, denaturing acrylamide gels are most appropriate. These gels are extremely versatile and can resolve RNAs from ~600 to RNA-protein complexes, native gels are appropriate. The only disadvantage to acrylamide gels is that they are not suitable for analyzing large RNAs (> or =600 nt); for such applications, agarose gels are preferred. This protocol describes how to prepare, load, and run polyacrylamide gels for RNA analysis.

  4. Thermal solar energy - application in industrial heat processes; Energia solar termica - aplicacion en procesos industriales de calor

    Energy Technology Data Exchange (ETDEWEB)

    Bonneschky, Alexis [Universidad Tecnica de Brandenburgo/Cottbus (Germany); Roth, Pedro; Cancino, Beatriz [Universidad Tecnica Federico Santa Maria, Valparaiso (Chile); Kanig, Thomas [Germany, (Georgia)

    2000-07-01

    agua en la industria, integrando a las empresas a traves de alguna estrategia que signifique una finalidad comun que beneficie a ambas. En este informe se presenta un proyecto realizado con dos empresas vecinas en la region de Branderburgo Alemania, que se benefician mutuamente por la instalacion de la energia solar, pero que son independientes en cuanto a sus propositos y capitales. La primera empresa es la fabrica FK-Solartchnik Kleinkoschen que produce colectores solares para agua caliente y le interesa desarrollar publicidad en este sentido, por lo que puso a disposicion de la segunda industria el area necesaria para instalar los colectores solares. La segunda empresa, es la FGT Glaswerk Kleinkoschen que produce planchas de vidrio de alta calidad, pero no cuenta con fachada disponible para la instalacion de ningun equipo solar. En esta industria, para la fabricacion del vidrio, se utiliza agua caliente. Las planchas de vidrio, ya cortadas, pasan a un proceso de lavado y secado. El lavado, requiere de un volumen de 1 m{sup 3}/dia agua caliente, a 600 grados Celsius y se realiza entre las 6:30 y las 15:30 h. El calentamiento del agua era efectuado con dos calentadores electricos (alrededor de 12 kW cada uno). Se diseno un equipo solar que permite disminuir las perdidas de energia en la acumulacion en las horas siguientes al proceso, donde se calienta el agua, y adicionalmente se cubre parte de los requerimientos del agua consumida. Este equipo tiene una superficie de colector de 27 m{sup 2}. Con este sistema, mas el aporte realizado por los trabajadores de la empresa, disminuyo la temperatura del agua de lavado en 20 K, sin afectar la calidad del producto y se redujo ademas el consumo anual de energia electrica de la empresa en 15,000 kWh, utilizando los recursos de la energia solar en un 50% del consumo total.

  5. Production of income and energy using cattle excrete. Farming projects MDL; Produciendo ingresos y energia utilizando excretas pecuarias. Proyectos MDL agropecuarios

    Energy Technology Data Exchange (ETDEWEB)

    Hernan, Mateus [AGCERT, Mexico, D.F. (Mexico)

    2005-07-01

    The Mexican Farming Sector has a great potential to help solve the worldwide problems caused by greenhouse effect gases (GEI). The Kyoto Protocol is an instrument created to reduce the greenhouse effect gases (GEI) and it also is the fundament of the AgCert project -which consists in applying own financial resources to develop technological options that contribute to the reduction of greenhouse effect gases in cattle productive facilities and to use the income to economically support the producers. In this document it is described the way in which the biodigestor was installed, demonstrating that the MDL for farming projects is a tool to reduce the discharges of greenhouse effect gases. It also demonstrates that technologies and processes can be applied systematically to reduce the emissions of the GEI, bringing along environmental and economic benefits. [Spanish] El Sector Agropecuario Mexicano tiene un gran potencial para ayudar a resolver los problemas mundiales causados por los gases de efecto invernadero (GEI). El protocolo de Kyoto es un instrumento creado para reducir las emisiones de gases de efecto invernadero (GEI) y tambien es el fundamento del proyecto AgCert, el cual consiste en aplicar recursos financieros propios para desarrollar opciones tecnologicas que contribuyan a la reduccion de gases efecto invernadero en instalaciones productivas pecuarias y emplear los ingresos para apoyar economicamente a los productores. En este documento se describe la manera en que se llevo acabo la instalacion del biodigestor, demostrando que el MDL para proyectos agropecuarios es una herramienta para reducir emisiones de gases efecto invernadero, y que se pueden aplicar sistematicamente tecnologias y procesos que reduzcan las emisiones de los GEI, trayendo consigo beneficios ambientales y economico.

  6. Procedures for processing power using agricultural waste to Brazil; Processos de transformacao em energia eletrica utilizando residuos agricolas para o Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Marcelo Jose da; Souza, Samuel Nelson Melegari de; Santos, Reginaldo Ferreira; Wolff, Paulo Sergio [Universidade do Oeste Paulista (CCET/UNIOESTE), Cascavel, PR (Brazil)], E-mail: ssouza@unioeste.br

    2009-07-01

    The suitable process for waste vegetable processing is the thermochemistry because of the low moisture promotes the convert ion process. The use of gasified gas generated by an agricultural waste can reduce the consumption of diesel by up to 80% in internal combustion engines. Cogeneration is suitable for the use of crop residues of sugar cane by the mills, generating heat, mechanical and electrical energy. The use of agricultural waste to energy end is an interesting alternative, since it does not compete with food production. Based on calculations for the processing of the cane remains in electric power it was estimated that the generation is 2301.3 million GJ/year by cogeneration. (author)

  7. Energy conservation analysis using Fuzzy logic considering technical and environmental aspects; Analise da conservacao de energia utilizando logica fuzzy considerando aspectos tecnicos e o meio ambiente

    Energy Technology Data Exchange (ETDEWEB)

    Haddad, Jamil; Yamachita, Roberto Akira; Guardia, Eduardo Crestana [Universidade Federal de Itajuba (UNIFEI), MG (Brazil). Centro de Excelencia em Eficiencia Energetica; Reis, Alexandre de Souza Rodrigues dos; Pinto, Luiz Fernando do Monte [Furnas Centrais Eletricas, Rio de Janeiro, RJ (Brazil)

    2008-07-01

    This article presents the results obtained in the Project of Research and Development of Furnas Centrais Eletricas, which was accomplished with the partnership of the Fundacao de Pesquisa e Assessoramento a Industria - FUPAI. This project analyzed technically and economically the pollution caused in the electric net by the use, in growing scale, of nonlinear loads, such as: compact fluorescent lamps, microwave ovens, VHS systems, DVD, sound systems, etc. It was also analyzed the environmental impact caused by these lamps due to the presence of the mercury; and as complement to the traditional theory of economical analysis, a tool of economical analysis was developed using the theory of fuzzy sets for the uncertainty variables or of difficult quantification. (author)

  8. Standardization of the temperature of the drier of agricultural products using biomass energy; Padronizacao da temperatura de um secador de produtos agropecuarios utilizando energia de biomassa

    Energy Technology Data Exchange (ETDEWEB)

    Bernardino, Cassiano Augusto Rolim; Valenca, David da Cunha [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil); Amorim, Elizete [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil). Curso de Ciencia e Tecnologia de Alimentos; Barbosa Junior, Jose Lucena; Silva, Pedro Paulo de Oliveira [Universidade Federal Rural do Rio de Janeiro (DTA/IT/UFRRJ), Seropedica, RJ (Brazil). Inst. de Tecnologia. Dept. de Tecnologia de Alimentos

    2010-07-01

    The aim of this work was to study the influence of the mass and dimensions of wood (length and diameter) on the temperature variation in a drying system for agricultural products which use energy from the combustion of wood. In this system, the heat generated from burning wood is transferred by heat exchangers to a certain amount of water in a closed circuit, which returns the heat to the drying air (0,074 m{sup 3}.s{sup -1}). It was found that the addition to each hour of two pieces of 4,5 cm in diameter, 35 cm in length and the total weight of 1066 g, provided temperatures from 40,6 to 48,3 deg C in different positions of the dryer. When using three pieces of the same dimensions and mass of 1720 g, the temperature range obtained was from 77,6 to 80,2 deg C. The averages over all experiments had coefficients of variation below 5%, ensuring a drying system with controlled temperature from the energy obtained from combustion of biomass. The results showed the existence of a relationship between the amount of wood added and the temperature in the drier ant that the equipment can be used to obtain standardized dried products on small farms. (author)

  9. Disinfection of water using solar energy (SODIS): inactivation and reactivation of bacteria; Desinfeccao de agua utilizando energia solar (SODIS): inativacao e recrescimento bacteriano

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Marcelo Jacomini Moreira da

    2004-07-01

    Besides being an available natural source, the solar energy is very applicable in places where there are bad recourses and low money resources, because there are not either the need of chemical products neither a huge cost (commercial materials can be re-used). To make this job we used re-used half painted black PET bottles with the variables: exposed to heat times: 1, 2, 4 e 6 hours and we used also a concentrator of rays of sunshine. The affluent control parameters were: turbidity, apparent color, temperature, total coliforms and E. coli. The effluent parameters were just the last three: temperature, total coliforms and E.coli. To asses the bacteria reactivation the water was kept in bottles for 24 hours, pretending a situation that is very common in brazilian rural houses. We conclude that the use of the concentrator of rays of sunshine can reduce the exposition to heat from 6 to 4 hours, without prejudice the SODIS efficiency and using the concentrator of rays of sunshine for 6 hours we can obtain the process of solar pasteurization (SOPAS), with a 70 deg C water temperature and stopping the re-growth of bacteria. We also observed that when there are clouds in the sky the incidence of solar radiation and the SODIS efficiency decrease, even if the water temperature is higher during the disinfection, although this factor does not mean a significant influence statistically. (author)

  10. A water heating system analysis for rural residences, using solar energy; Analise de um sistema de aquecimento de agua para residencias rurais, utilizando energia solar

    Energy Technology Data Exchange (ETDEWEB)

    Basso, Luiz H.; Souza, Samuel N.M. de; Siqueira, Jair A.C.; Nogueira, Carlos E.C.; Santos, Reginaldo F. [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil). Programa de Pos-Graduacao em Engenharia Agricola], emails: melegsouza@yahoo.com, ssouza@unioeste.br, jairsiqueira@unioeste.br, cecn1@yahoo.com.br, rfsantos@unioeste.br

    2010-01-15

    The awareness of the importance of the environment has stimulated the study of new renewed energy sources and less pollutant. Amongst these sources, solar energy stands alone for being perennial and clean. The use of solar energy in systems of agricultural residential water heating, can complement the economy of electric energy, base of the Brazilian energy matrix. Knowing the factors that influence the operation of a system of water heating by solar energy is important in determining their technical viabilities targeting their distribution in agricultural residences. To evaluate equipment of water heating for solar energy, a prototype was constructed in the campus of Assis Gurgacz College, in Cascavel,State of Parana, Brazil, with similar characteristics to equipment used in residences for two inhabitants, to function with natural circulation or thermo siphon and without help of a complementary heating system. The equipment revealed technical viability, reaching the minimum temperature for shower, of 35 deg C, whenever the solar radiation was above the 3,500 Wh m{sup -2}, for the majority of the studied days. (author)

  11. Caracterização do isolamento acústico de uma parede de alvenaria, utilizando análise estatística de energia (SEA)

    OpenAIRE

    Paixão, Dinara Xavier da

    2002-01-01

    Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. Nesse trabalho estudaram-se questões conceituais referentes ao isolamento acústico, buscando-se adaptá-las às especificidades das edificações. Constatou-se a inexistência de dados confiáveis sobre materiais e técnicas construtivas, por isso determinaram-se parâmetros físico-mecânicos e acústicos, para uma parede de alvenaria de tijolos maciços cerâmicos. Foi e...

  12. Low-energy X-ray and gamma spectrometry using silicon photodiodes; Espectrometria de raios X e gama de baixa energia utilizando fotodiodos de silicio

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Iran Jose Oliveira da

    2000-08-01

    The use of semiconductor detectors for radiation detection has increased in recent years due to advantages they present in comparison to other types of detectors. As the working principle of commercially available photodiodes is similar to the semiconductor detector, this study was carried out to evaluate the use of Si photodiodes for low energy x-ray and gamma spectrometry. The photodiodes investigated were SFH-205, SFH-206, BPW-34 and XRA-50 which have the following characteristics: active area of 0,07 cm{sup 2} and 0,25 cm{sup 2}, thickness of the depletion ranging from 100 to 200 {mu}m and junction capacitance of 72 pF. The photodiode was polarized with a reverse bias and connected to a charge sensitive pre-amplifier, followed by a amplifier and multichannel pulse analyzer. Standard radiation source used in this experiment were {sup 241} Am, {sup 109} Cd, {sup 57} Co and {sup 133} Ba. The X-ray fluorescence of lead and silver were also measured through K- and L-lines. All the measurements were made with the photodiodes at room temperature.The results show that the responses of the photodiodes very linear by the x-ray energy and that the energy resolution in FWHM varied between 1.9 keV and 4.4 keV for peaks corresponding to 11.9 keV to 59 keV. The BPW-34 showed the best energy resolution and the lower dark current. The full-energy peak efficiency was also determined and it was observed that the peak efficiency decreases rapidly above 50 keV. The resolution and efficiency are similar to the values obtained with other semiconductor detectors, evidencing that the photodiodes used in that study can be used as a good performance detector for low energy X-ray and gamma spectrometry. (author)

  13. Regenerative electronic load for electric power sources tests using capacitive idling converter; Carga eletronica regenerativa para testes de fontes de energia eletrica utilizando conversor com capacitor flutuante

    Energy Technology Data Exchange (ETDEWEB)

    Vendrusculo, Edson Adriano

    1996-07-01

    The conventional method for testing power supplies, batteries, uninterruptible power supply and other sources of electric power uses resistors as load. This results in wasted heat and increases the equipment production cost. This work presents a Regenerative electronic Load to substitute those resistors. The basic topology is a capacitive idling Cuk converter. This converter allows to control independently the input current and permits to provide a sinusoidal output current. An appropriate gate command allows to have some soft-commutation without the use of any auxiliary circuit. The same converter, with input and output changed, can operate as a Power Supply with Input Power Factor Correction. The characteristics of soft-commutation and high efficiency are maintained. A simple high-efficiency transformer allows output isolation. All theoretical results are experimentally verified. (author)

  14. Water pumping system using solar photovoltaic induction motor; Sistema de bombeamento de agua com energia solar fotovoltaica utilizando motor de inducao trifasico

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, Eduardo Henrique Pereira de; Bezerra, Luiz Daniel Santos; Antunes, Fernando Luiz Marcelo [Universidade Federal do Ceara (DEE/PPGEE/UFC), Fortaleza, CE (Brazil). Dept. de Engenharia Eletrica. Programa de Pos -Graduacao em Engenharia Eletrica; Borges Neto, Manuel Rangel [Centro Federal de Educacao Tecnologica de Petrolina (CEFET), PE (Brazil)

    2008-07-01

    One of the main difficulties to people who live in remote areas or isolated community and not grid connected, certainly is to access potable drink water. In the world, more than 6000 children dies everyday by some kind of illnesses associated to non-potable drink water. At state of Ceara, during the dry weather periods, remain water reservoir becomes practically a mud puddle, as a result, people and animals are forced to drink this inappropriate water. To minimize this consequences in this periods some water is distributed by tankers but, sometimes, even this water is not enough potable. Underground water is an alternative to mitigate this problem. The most common technique is the use of direct current (DC) pumps set supplied by solar photovoltaic systems. However, this kind of pump-set is relatively expensive and too hard to maintain. This paper brings an alternative lower expensive and sustainable to water pumping system, it uses a three phase induction machine coupled to an underwater centrifugal pump supplied by solar photovoltaic energy system. (author)

  15. Probabilistic analysis of safety of a production plant of hydrogen using nuclear energy; Analisis probabilistico de seguridad de una planta de produccion de hidrogeno utilizando energia nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Flores F, A. [Facultad de Ingenieria, UNAM, 04510 Mexico D.F. (Mexico); Nelson E, P.F.; Francois L, J.L. [Facultad de Ingenieria, UNAM, Paseo Cuauhnahuac 8532, Jiutepec, Morelos (Mexico)]. e-mail: alain_fyf@yahoo.com

    2005-07-01

    The present work makes use of the Probabilistic Safety analysis to evaluate and to quantify the safety in a plant producer of hydrogen coupled to a nuclear reactor of high temperature, the one which is building in Japan. It is had the description of systems and devices of the HTTR, the pipe diagrams and instrumentation of the plant, as well as the rates of generic faults for the components of the plant. The first step was to carry out a HAZOP study (Hazard and Operability Study) with the purpose of obtaining the initiator events; once obtained these, it was developed a tree of events by each initiator event and for each system it was developed a fault tree; the data used for the quantification of the failure probability of the systems were obtained starting from several generic sources of information. In each tree of events different final states were obtained and it stops each one, their occurrence frequency. The construction and evaluation of the tree of events and of failures one carries out with the SAPHIRE program. The results show the safety of the shutdown system of the HTTR and they allow to suggest modifications to the auxiliary system of refrigeration and to the heat exchanger helium/water pressurized. (Author)

  16. PROTOCOLO PARA A AVALIAÇÃO E TRATAMENTO EM FERIDAS UTILIZANDO O LASER DE BAIXA INTENSIDADE: UMA PROPOSTA

    Directory of Open Access Journals (Sweden)

    Ana Lúcia Gargione Galvão de Sant’Anna

    2011-08-01

    Full Text Available Propõe-se a elaboração de um protocolo de intervenção de enfermagem em feridas, utilizando-se Laser de Baixa Intensidade (LBI, para subsidiar profissionais de saúde no cuidado delas. Os LBI utilizados como coadjuvantes no tratamento de feridas auxiliam a restauração tecidual, melhoram a regeneração e a cicatrização dos tecidos, atuam na inflamação e no edema, aliviando a dor. Utilizou-se metodologia descritivo-exploratória com abordagem quantitativa, cuja proposta foi submetida à apreciação de 18 juízes: 06 enfermeiros, 06 físicos, 06 médicos, todos especializados no assunto, que responderam voluntariamente, observadas todas as normas éticas, questões abertas e fechadas, sobre cada item do protocolo. Os resultados da análise pelos 18 juízes evidenciaram a necessidade, a abrangência, a sistematização da avaliação e aplicação efetiva da ferida e do registro dos dados. Dois juízes sugeriram alterar somente a sequência de algumas questões e dois opinaram adicionar a relação existente entre a energia total ministrada pelo laser e as áreas totais de tratamento e a distância entre os pontos de aplicação. Os resultados obtidos permitem inferir que a proposta é importante e necessária para a terapêutica com LBI em feridas e subsidiar a sistematização dessa terapêutica pelos enfermeiros e demais profissionais de saúde capacitados para esse fim.

  17. Radiotherapy gel dosimetry

    International Nuclear Information System (INIS)

    Baldock, C.

    2002-01-01

    shapes and sizes while sparing normal tissue. The situation is further complicated if the normal tissues are critical organs or are particularly sensitive to radiation. Radiotherapy techniques employed to obtain a closer conformation of the dose distribution to the tumour volume are referred to as conformal radiotherapy techniques. The clinical implementation of conformal therapy has been delayed by limitations in the verification of conformal dose distributions calculated by treatment planning systems prior to the irradiation of the patient and the verification of complex treatments during its delivery to the patient. There are several aspects of conformal therapy that complicate dose verification. To achieve the dose distributions conforming to complex 3D volumes, high dose gradients arise in the treatment volume. Further, overdose or underdose regions can exist when separate radiation fields are used to deliver additional radiation. These aspects require that practical dose measurement (dosimetry) techniques be able to integrate dose over time and easily measure dose distributions in 3D with high spatial resolution. Traditional dosimeters, such as ion chambers, thermoluminescent dosimeters and radiographic film do not fulfil these requirements. Novel gel dosimetry techniques are being developed in which dose distributions can potentially be determined in vitro in 3D using anthropomorphic phantoms to simulate a clinically irradiated situation. As long ago as the 1950's, radiation-induced colour change in dyes was used to investigate radiation doses in gels. It was subsequently shown that radiation induced changes in nuclear magnetic resonance (NMR) relaxation properties of gels infused with conventional Fricke dosimetry solutions could be measured using magnetic resonance imaging (MRI). In Fricke gels, Fe 2+ ions in ferrous sulphate solutions are usually dispersed throughout a gelatin, agarose or PVA matrix. Radiation-induced changes in the dosimeters are considered to

  18. O Uso de Famílias de Circuitos e Rede Neural Artificial para Previsão de Demanda de Energia Elétrica

    Directory of Open Access Journals (Sweden)

    José Leomar Todesco

    2004-08-01

    denominado método indireto de previsão da carga, e dele decorrem todos os cálculos elétricos do circuito para aferir seu desempenho quanto à qualidade dos níveis de tensão, do carregamento dos equipamentos e condutores, do balanceamento da carga, bem como das perdas elétricas. Este artigo apresenta uma proposta de estudo das famílias de circuitos (residencial, comercial, industrial, rural, público e outros utilizando informações sobre o consumo de energia através da aplicação de algoritmos de clustering e, posteriormente, da aplicação de uma Rede Neural Artificial (RNA para a aproximação das curvas de demanda para as famílias identificadas. A RNA utilizada foi a Radial Basis Function (RBF, por ser um aproximador universal. São também apresentados no artigo testes comparativos realizados com o modelo de regressão linear simples e a RBF.

  19. ENERGIA EÓLICA E IMPACTOS AMBIENTAIS: UM ESTUDO DE REVISÃO

    Directory of Open Access Journals (Sweden)

    Raphael Santos do Nascimento

    2017-01-01

    Full Text Available Resumo: A energia eólica é cada vez mais utilizada em todo o mundo como uma importante contribuição para a energia renovável. Entretanto os países de interesse estão preocupados com seus respectivos impactos ambientais. Assim, com a finalidade de contribuir com a discussão sobre este tema, o presente estudo teve como objetivo analisar o uso da energia eólica como fonte renovável e limpa, e apresentar o seu respectivo potencial gerador, podendo ser ela uma alternativa energética e grande aliada no combate a emissão de gases do efeito estufa. Assim concluiu-se neste estudo que a energia eólica tem um futuro ainda mais promissor com a conscientização pública das suas vantagens como fonte renovável e progressiva competitividade econômica. Contudo mesmo apresentando, como toda tecnologia energética apresenta, algumas características ambientais desfavoráveis, conforme visto neste trabalho, o aproveitamento dos ventos para geração de energia elétrica deve ser encorajado e algumas destas características podem ser significativamente minimizadas e até mesmo eliminadas com planejamento adequado e inovações tecnológicas.

  20. 77 FR 23476 - Energia Sierra Juarez U.S., LLC; Supplemental Notice That Initial Market-Based Rate Filing...

    Science.gov (United States)

    2012-04-19

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Energia Sierra Juarez U.S., LLC; Supplemental Notice That Initial Market... in the above-referenced proceeding of Energia Sierra Juarez U.S., LLC's application for market-based...

  1. Gunnar Okk jääb vähemalt aastaks Eesti Energia etteotsa / Urmas Tooming

    Index Scriptorium Estoniae

    Tooming, Urmas

    2005-01-01

    Eesti Energia nõukogu otsustas, et Eesti Energia juhi kohale korraldatakse konkurss aasta pärast ning nõukogu esimees Urmas Sõõrumaa sai volituse juhatuse liikmetega läbi rääkida ja nende lepinguid aasta võrra pikendada. Lisa: Gunnar Oki töö

  2. Gel polymer electrolytes for batteries

    Science.gov (United States)

    Balsara, Nitash Pervez; Eitouni, Hany Basam; Gur, Ilan; Singh, Mohit; Hudson, William

    2014-11-18

    Nanostructured gel polymer electrolytes that have both high ionic conductivity and high mechanical strength are disclosed. The electrolytes have at least two domains--one domain contains an ionically-conductive gel polymer and the other domain contains a rigid polymer that provides structure for the electrolyte. The domains are formed by block copolymers. The first block provides a polymer matrix that may or may not be conductive on by itself, but that can soak up a liquid electrolyte, thereby making a gel. An exemplary nanostructured gel polymer electrolyte has an ionic conductivity of at least 1.times.10.sup.-4 S cm.sup.-1 at 25.degree. C.

  3. Thoria sol-gel processes

    International Nuclear Information System (INIS)

    Matthews, R.B.

    1978-10-01

    Alternate fuel fabrication techniques are being developed at WNRE as part of the thorium fuel cycle program. The sol-gel techniques are attractive and this report assembles and summarizes information relating to thoria sol-gel fuels. Some background information on the behaviour and advantages of sol-gel fuel forms is presented, followed by a review of relevant colloid chemistry and an explanation of the fundamental steps of sol-gel processes. Finally, several variants to the basic process are reviewed and evaluated. (author)

  4. Radiotherapy gel dosimetry: a review

    International Nuclear Information System (INIS)

    Baldock, C.

    2003-01-01

    Radiation therapy or radiotherapy is a common form of cancer treatment. Recent advances in radiotherapy such as intensity modulated radiation therapy indicate that treatment outcomes may be improved. The principle limitation of these more advanced techniques of radiation therapy is the ability to quantify the absorbed radiation dose to the tumour which is related to the 3- dimensional geometry of the tumour. The main advances in 3-dimensional radiation dosimetry are the development of radiation sensitive polymer gel dosimeters. The use of radiation sensitive gels for radiation dosimetry in cancer therapy was first suggested in the 1950s. It was subsequently shown in 1984 that radiation induced changes in nuclear magnetic resonance relaxation properties of gels infused with conventional Fricke dosimetry solutions could be measured. Due to diffusion-related limitations in the use of Fricke gels, alternative polymer gel dosimeters were subsequently suggested in 1992. Since then, both magnetic resonance and optical imaging techniques have been used to evaluate polymer gel dosimeters to produce three-dimensional radiation dose distributions. More recently the uses of x-ray computer tomography and vibrational spectroscopy have also been demonstrated as valuable techniques in the evaluation of these dosimetry gels. Although not yet used routinely clinically, applications of these radiologically soft-tissue equivalent gel dosimeters have been shown to have great potential in the evaluation of complex radiation dose distributions. A review of 3-dimensional radiotherapy gel dosimetry is presented

  5. Portal WEB 2.0. utilizando Framework Struts

    OpenAIRE

    Palacín Mateo, Manuel

    2007-01-01

    El propósito de este proyecto es la implementación de un portal interactivo de contactos utilizando las tecnologías J2EE mediante Struts y siguiendo la tendencia Web 2.0. Previo a esta implementación se ha hecho una valoración del mercado actual de los portales de contactos y se han evaluado los servicios que ofrecen para posteriormente añadirlos a la demostración tecnológica. Tras esto se ha explicado lo que es la tendencia Web 2.0. Finalmente se han evaluado las diferentes opciones o tec...

  6. PRODUCCIÓN DE BIOFERTILIZANTES UTILIZANDO Pseudomonas sp.

    OpenAIRE

    Santillana-Villanueva, Nery; Universidad Nacional Agraria La Molina (Perú).

    2006-01-01

    Con el objetivo de producir biofertilizantes utilizando 3 cepas de Pseudomonas sp., se realizaron tres experimentos: el primero, para encontrar un medio de cultivo apropiado para la multiplicación de las bacterias; el segundo, para determinar la sobrevivencia de las cepas de Pseudomonas sp en los biofertilizantes y el tercero para determinar la dosis eficiente de aplicación del biofertilizante en frijol, maíz, papa y tomate, en condiciones de invernadero. Al evaluar los resultados, se determi...

  7. Book Presentation: “L’Energia del vuoto” by Bruno Arpaia

    CERN Multimedia

    CERN Library

    2012-01-01

    “It is nighttime on a Swiss highway. A car travels at high speed, heading to Marseilles. Pietro Leone, UN Geneva civil servant, is at the wheel. His son Nico is asleep next to him. The two are fleeing from something unknown...   ... Pietro only knows that, for the past few days, someone has been discreetly following him and his family, and that his wife Emilia, a CERN researcher, vanished from home a few days before…” Would you like to know what happens next? The Library, in cooperation with the association “Cultura Italia”, is organizing a presentation of “L’energia del vuoto”. A brief introduction to this book will be followed by a debate among the participants. Bruno Arpaia, journalist, writer and translator, has written 3 novels and 4 political essays. “L’energia del vuoto” is his latest novel, inspired by a visit he paid to CERN.   “L’energia del...

  8. Interactive applications for energy saving; Aplicaciones interactivas para ahorro de energia

    Energy Technology Data Exchange (ETDEWEB)

    Adame Gonzalez, Alejandro; Ramirez Anaya, Cesar; Gutierrez, Hector; Dominguez Ojeda, Xerxes; Aguilar Galvan, Alfredo [Ingenieria Energetica Integral S. A. de C. V., Mexico, D. F. (Mexico)

    1998-12-31

    A series of ideas are presented that can help in the development of interactive applications for energy saving. Emphasis is made on the Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE)`s Interactive Course on Demand Management and Power Factor Compensation, in order to demonstrate how far one can go with the multimedia development. [Espanol] Se presenta un conjunto de ideas que pueden auxiliar en la elaboracion de aplicaciones interactivas para ahorro de energia. Se hace principal enfasis sobre el curso interactivo Administracion de la Demanda y Compensacion del Factor de Potencia del Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE) con la finalidad de mostrar hasta donde puede llegarse con un desarrollo multimedia.

  9. Custo da eletricidade gerada em conjunto motor gerador utilizando biogás da suinocultura - DOI: 10.4025/actascitechnol.v26i2.1510

    Directory of Open Access Journals (Sweden)

    Samuel Nelson Melegari de Souza

    2004-03-01

    Full Text Available Uma das maiores fontes de energia disponíveis nas áreas rurais e agroindustriais é a biomassa. A mesma aparece na forma de resíduos vegetais e animais, tais como restos de colheita, esterco animal, plantações energéticas e efluentes agroindustriais. Estes resíduos podem ser utilizados pelo produtor rural ou agroindústria para a queima direta, visando a produção de calor ou produção de biogás em biodigestores. Nas propriedades agrícolas, onde há a atividade de suinocultura, ocorre a disponibilidade desses resíduos, caracterizando-se num grande potencial energético. No presente trabalho objetivou-se determinar o custo e viabilidade de produção de eletricidade gerada a partir do biogás EM uma propriedade rural, utilizando-se como equipamentos de conversão de biogás em eletricidade, um motor de combustão interna acoplado a um gerador elétrico

  10. Energy saving, social and government communication; Ahorrro de energia, sociedad y comunicacion gubernamental

    Energy Technology Data Exchange (ETDEWEB)

    Morales Camarena, Francisco [Comision Nacional para el Ahorro de Energia, Mexico, D.F. (Mexico)

    2001-07-01

    The actions for the energy efficiency and the utilization of renewable energies are multiple and dispersed, in each one of the energy consumption points of the country. For this reason, two important factors to foment these actions are to promote the social participation and the effective government communication towards the society: energy saving and social participation. One of the main faculties of the National Commission of Energy Saving (CONAE) is to foment the efficiency in the energy use, through actions coordinated with the different agencies and organizations of the Federal Public Administration, with the governments of the federal entities and the municipalities and, through coordinated operations, with the private and social sectors. The CONAE has established mechanisms of coordination and cooperation with the private and social sectors, having fomented programs, projects and actions whose purpose is the energy efficiency, outstanding: 1) Committees and work groups; 2) Cooperation Agreements; 3) the Advisory Council for the Foment of Renewable Energy. [Spanish] Las acciones para la eficiencia energetica y el aprovechamiento de las energias renovables son multiples y dispersas, en cada uno de los puntos de consumo de energia del pais. Por ello, dos factores importantes para fomentar estas acciones son promover la participacion social y la comunicacion gubernamental eficaz hacia la sociedad: Ahorro de energia y participacion social. Una de las principales facultades de la Comision Nacional de Ahorro de Energia es fomentar la eficiencia en el uso de energia, a traves de acciones coordinadas con las diversas dependencias y entidades de la Administracion Publica Federal, con los gobiernos de las entidades federativas y de los municipios y, a traves de acciones concertadas, con los sectores social y privado. La CONAE ha establecido mecanismos de coordinacion y de cooperacion con los sectores privado y social, fomentando programas, proyectos y acciones cuyo

  11. Inovação e sustentabilidade na produção de energia: o caso do sistema setorial de energia eólica no Brasil

    Directory of Open Access Journals (Sweden)

    Thiago Cavalcante Nascimento

    Full Text Available Este artigo tem por objetivo verificar como as ações do sistema setorial brasileiro de energia eólica se relacionam com as perspectivas econômicas, sociais e ambientais que caracterizam inovações sustentáveis. Argumenta que as questões energéticas estão no cerne do desenvolvimento humano ao longo de sua história e que, em decorrência do atual cenário de mudanças climáticas, o desenvolvimento de fontes alternativas de energia é de vital importância na contemporaneidade. Metodologicamente, o estudo pode ser considerado exploratório e descritivo em relação aos fins e bibliográfico no que diz respeito aos meios. Foram utilizados dados primários de agências nacionais, regionais e mundiais de energia eólica para aumentar a consistência das informações coletadas e do trabalho como um todo. Os resultados evidenciam que o sistema setorial de energia eólica está estruturado em torno de uma série de instituições públicas, autarquias, associações de pesquisa e outros stakeholders que demonstram crescente interesse no desenvolvimento do setor no país. Os dados indicam, ainda, que os valores alcançados ao longo dos últimos leilões de energia eólica têm evidenciado o potencial de competitividade dessa fonte energética em comparação com as demais. Conclusivamente, é possível verificar que os pilares da sustentabilidade podem ser visualizados ao longo de praticamente todas as questões envolvendo a implantação de novas usinas eólicas, mas que a dimensão econômica ainda é a de maior destaque, tornando as dimensões sociais e ambientais dependentes da capacidade dessa modalidade de energia competir com outras.

  12. Rheology and structure of milk protein gels

    NARCIS (Netherlands)

    Vliet, van T.; Lakemond, C.M.M.; Visschers, R.W.

    2004-01-01

    Recent studies on gel formation and rheology of milk gels are reviewed. A distinction is made between gels formed by aggregated casein, gels of `pure` whey proteins and gels in which both casein and whey proteins contribute to their properties. For casein' whey protein mixtures, it has been shown

  13. Gel placement in porous media

    NARCIS (Netherlands)

    F.J. Vermolen; J. Bruining; C.J. van Duijn (Hans)

    1999-01-01

    textabstractIn this paper we analyse advective transport of polymers, crosslinkers and gel, taking into account non-equilibrium gelation, gel adsorption and crosslinker precipitation. In absence of diffusion/dispersion the resulting model consists of hyperbolic transport-reaction equations. These

  14. Energy from garbage; Energia a partir de la basura

    Energy Technology Data Exchange (ETDEWEB)

    Arvizu Fernandez, Jose Luis [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1997-12-31

    The subject of energy generation from garbage is discussed. A description is made of the sanitary fill, which is a system for the conversion or stabilization of garbage encompassing gas generation and lixiviates, these are collected to be used as fuels or a treatment process is applied to them avoiding this way the soil, water and air pollution; also a description is made of the utilization of a biogas recovery well, which recovers the biogas, cleans it from particles and condensates and afterwards feeds an internal combustion motor coupled to an electric generator. It is concluded that if the biogas generated by the buried garbage in the sanitary refills is utilized, the effects that cause the polluting emissions would be diminished and at the same time an additional energy resource would be on hand [Espanol] Se analiza el caso de la generacion de energia a partir de la basura. Se describe la tecnologia de relleno sanitario, la cual es un sistema de conversion o estabilizacion de la basura en el que existe generacion de biogas y lixiviados, estos se capturan para usarlos como combustibles o se les da un proceso de tratamiento y asi se evita la contaminacion del suelo, agua y aire; tambien se describe la utilizacion de un pozo de recuperacion de biogas, el cual recupera el biogas, lo limpia de particulas y condensados y despues alimenta a un motor de combustion interna acoplado a un generador. Se concluye en que si se aprovecha el biogas generado por la basura enterrada en rellenos sanitarios se diminuiran los efectos que causan las emisiones contaminantes y al mismo tiempo se tendria un recurso energetico adicional

  15. KIT EDUCACIONAL PARA ESTUDO DE GERAÇÃO ELÉTRICA A PARTIR DE ENERGIA EÓLICA

    Directory of Open Access Journals (Sweden)

    Antonio Luiz P. S. Campos

    2010-09-01

    Full Text Available Vários estudos desenvolvidos nos últimos anos apontam para as implicações e impactos sócio-ambientais do consumo de energia. Fontes de energias renováveis são apresentadas como alternativa para atender as demandas da sociedade com qualidade, segurança e redução dos danos ambientais decorrentes do consumo de energia. Este artigo apresenta uma proposta de kit educacional para ensino do uso de energia eólica na geração de energia elétrica. Inicialmente, o artigo descreve a evolução do aproveitamento da energia eólica. Depois, o artigo apresenta algumas experiências sobre o ensino desse tipo de energia no ensino médio e superior. O kit educacional é apresentado, mostrando-se resultados obtidos com o aerogerador tais como tensão gerada e circuitos eletrônicos utilizados. Algumas práticas são sugeridas. Por fim, as principais conclusões acerca do sistema são apresentadas.

  16. Chemical Gel for Surface Decontamination

    International Nuclear Information System (INIS)

    Jung, Chong Hun; Moon, J. K.; Won, H. J.; Lee, K. W.; Kim, C. K.

    2010-01-01

    Many chemical decontamination processes operate by immersing components in aggressive chemical solutions. In these applications chemical decontamination technique produce large amounts of radioactive liquid waste. Therefore it is necessary to develop processes using chemical gels instead of chemical solutions, to avoid the well-known disadvantages of chemical decontamination techniques while retaining their high efficiency. Chemical gels decontamination process consists of applying the gel by spraying it onto the surface of large area components (floors, walls, etc) to be decontaminated. The gel adheres to any vertical or complex surface due to their thixotropic properties and operates by dissolving the radioactive deposit, along with a thin layer of the gel support, so that the radioactivity trapped at the surface can be removed. Important aspects of the gels are that small quantities can be used and they show thixitropic properties : liquid during spraying, and solid when stationary, allowing for strong adherence to surfaces. This work investigates the decontamination behaviors of organic-based chemical gel for SS 304 metallic surfaces contaminated with radioactive materials

  17. Denaturing gradient gel electrophoresis

    International Nuclear Information System (INIS)

    Kocherginskaya, S.A.; Cann, I.K.O.; Mackie, R.I.

    2005-01-01

    It is worthwhile considering that only some 30 species make up the bulk of the bacterial population in human faeces at any one time based on the classical cultivation-based approach. The situation in the rumen is similar. Thus, it is practical to focus on specific groups of interest within the complex community. These may be the predominant or the most active species, specific physiological groups or readily identifiable (genetic) clusters of phylogenetically related organisms. Several 16S rDNA fingerprinting techniques can be invaluable for selecting and monitoring sequences or phylogenetic groups of interest and are described below. Over the past few decades, considerable attention was focussed on the identification of pure cultures of microbes on the basis of genetic polymorphisms of DNA encoding rRNA such as ribotyping, amplified fragment length polymorphism and randomly amplified polymorphic DNA. However, many of these methods require prior cultivation and are less suitable for use in analysis of complex mixed populations although important in describing cultivated microbial diversity in molecular terms. Much less attention was given to molecular characterization of complex communities. In particular, research into diversity and community structure over time has been revolutionized by the advent of molecular fingerprinting techniques for complex communities. Denaturing or temperature gradient gel electrophoresis (DGGE/TGGE) methods have been successfully applied to the analysis of human, pig, cattle, dog and rodent intestinal populations

  18. Renewable energy: Political momentum and technology for a sustainable Mexico; Energias Renovables: Impulso politico y tecnologico para un Mexico sustentable

    Energy Technology Data Exchange (ETDEWEB)

    Romero Hernandez, Sergio; Romero Hernandez, Omar; Wood, Duncan [Instituto Tecnologico Autonomo de Mexico (ITAM) (Mexico)

    2011-04-15

    The renewable energy sector in Mexico, as shown in this book, is alive and in good condition, prospers and has great potential. In this regard, it is essential that Mexico sees itself as a country with an energy future beyond Cantarell, beyond Pemex and beyond oil. The future of renewable energy offers great hope for the country and the region, and the time is right for a consensus government, business and social more strongly boost the development of this sector. This book discusses the following topics: Renewable energy and sustainable economic development, the regulatory framework for the use of renewable energy, hydropower, bioenergy, Part I: biomass and biogas, bioenergy, Part II: Liquid biofuels; elements for promotion of wind energy in Mexico, geothermal energy, solar PV, solar thermal and micro. [Spanish] El sector de la energia renovable en Mexico, como se muestra en este libro, esta vivo y en buenas condiciones, prospera y tiene gran potencial. En ese sentido, resulta indispensable que Mexico se vea a si mismo como un pais con un futuro energetico mas alla de Cantarell, mas alla de PEMEX, mas alla del petroleo. El futuro de la energia renovable ofrece una gran esperanza para el pais y la region, y el tiempo es adecuado para que una concertacion gubernamental, empresarial y social impulse con mas fuerza el desarrollo de este sector. En este libro se analizan los siguientes temas: Energias renovables y desarrollo economico sustentable; el marco normativo de la utilizacion de las energias renovables; energia hidroelectrica; bioenergia, parte I: biomasa y biogas; bioenergia, parte II: biocombustibles liquidos; elementos para la promocion de la energia eolica en Mexico; energia geotermica; energia solar fotovoltaica; energia solar termica, y la microgeneracion.

  19. Design of the zero power reactor core of Instituto de Energia Atomica, SP, Brazil

    International Nuclear Information System (INIS)

    Ferreira, Antonio Carlos de Almeida

    1974-01-01

    The main characteristics of a graphite moderated core of a critical assembly to be installed in the zero power reactor of the Instituto de Energia Atomica have been defined. Several simple geometric configurations have been selected and criticality studies have been made. The necessary quantity of fissile uranium has been calculated. (author)

  20. Eesti Energia jätkab PR-kampaaniaga / Lembit Kaljuvee

    Index Scriptorium Estoniae

    Kaljuvee, Lembit, 1952-

    2009-01-01

    Riigikogu liige ja Eesti Põlevkivi juhatuse endine liige peab Eesti Energia börsile viimist majandusloogiliselt õigeks sammuks, kuid viitab börsile viimisega seotud riskidele. Tema väitel ei ole ettevõttes järgmisel aastal investeeringurahaga midagi peale hakata, sest pole tööks kõlblikke reaalseid projekte

  1. Eesti Energia võib sulgeda Narva elektrijaamad / Toivo Tänavsuu

    Index Scriptorium Estoniae

    Tänavsuu, Toivo

    2008-01-01

    Eesti Energia juhi Sandor Liive sõnul hakkab energiaturu avanedes Narva elektrijaamade töö sõltuma elektri turuhinnast ja CO₂ saastekvoodi hinnast ning kui Soomest tuleb odavam elekter kui Narvast, pole mõtet Narvas elektrit toota. S. Liive ettekandest energiaturgude avamisele pühendatud konverentsil Prahas

  2. Eesti Energia salatseb IPO eeltööde hinnaga / Jan Jõgis-Laats

    Index Scriptorium Estoniae

    Jõgis-Laats, Jan

    2010-01-01

    Eesti Energia juhatuse esimehe Sandor Liive väitel oli ettevõtte börsilemineku ettevalmistamise kulude suurusjärk kümnetes miljonites kroonides, suurimad kulutused tehti õigus- ja majandusanalüüsile. Eesti Energiat nõustanud firmad

  3. Technological advances in zero energy buildings; Avances tecnologicos en edificios de energia cero

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Milla, Guillermo; Perez Rebolledo, Hugo; Acoltzi Acoltzi, Higinio [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2011-07-01

    Buildings use a large amount of energy to operate and are one of the main sources of contaminating emissions. A building is a complex system and all of their components contribute to the total energy demand. The technology to construct zero-energy buildings is already available, but obstacles exist such as the lack of information and technical training of architects and engineers to design highly energy efficient buildings. The present article describes the progress to-date and the future prospects for the design and construction of zero-energy buildings, as well as the problems involved in its implementation. [Spanish] Los edificios usan una gran cantidad de energia para operar y son una de las principales fuentes de emisiones contaminantes. Un edificio es un sistema complejo y todos sus componentes contribuyen a la demanda total de energia. La tecnologia para construir edificios de energia cero ya esta disponible, pero existen barreras como falta de informacion o capacitacion tecnica a arquitectos e ingenieros, para disenar edificios de alta eficiencia energetica. El presente articulo muestra los avances a la fecha y la prospectiva para el diseno y construccion de edificios de energia cero, asi como la problematica para su implementacion.

  4. Energiasõltumatuse ohtlik fantaasia / A. F. Alhajji, Gavin Longmuir ; tõlk. Marek Laane

    Index Scriptorium Estoniae

    Alhajji, A. F.

    2007-01-01

    Autorid leiavad, et maailmas üha häälekamalt kõlav soov taotleda energiasõltumatust on absurdne, sest selle poole püüdlevate maade energeetiline julgeolek tegelikult väheneb. Kommenteerib energeetikaekspert Raivo Vare

  5. Eesti Energia, Tallinna Sadama, Eesti Posti ja Eesti Loto müügist / Heido Vitsur

    Index Scriptorium Estoniae

    Vitsur, Heido, 1944-

    2009-01-01

    Arutledes Eesti Energia, Tallinna Sadama, Eesti Posti ja Eesti Loto erastamise üle, märgib autor, et kui me tahame jätkata madalate maksude poliitikat ja leida lahendust nt. sotsiaalkindlustuse finantseerimise probleemile, ei vaja me mitte müügist saadavat ühekordset tulu, vaid püsivaid mittemaksulisi tulusid eri allikatest

  6. Energiasääst on üheaegselt võimalus ja paratamatus / Siim Kabrits

    Index Scriptorium Estoniae

    Kabrits, Siim, 1979-

    2011-01-01

    Hoonete energiasäästlikuks muutmine on üks lahendusi energiahinnatõusu vastu. Eestis on hinnanguliselt 17 000 kortermaja, millest 13 000 vajab lisasoojustamist. Kredex on aastaga välja andnud 217 korterimajade rekonstrueerimistoetust ligi 6 mln. euro eest

  7. Relação energia: proteína na nutrição do tucunaré

    Directory of Open Access Journals (Sweden)

    Sampaio Ana Maria Barreto de Menezes

    2000-01-01

    Full Text Available O objetivo deste estudo foi avaliar o efeito da relação energia:proteína no desempenho e composição corporal do tucunaré. Para tanto, 196 alevinos de tucunarés (Cichla sp., condicionados a aceitar alimentos secos, com peso médio vivo de 10 g, foram estocados em gaiolas de tela de volume igual a 25 L, alojadas em 16 caixas de cimento amianto com volume de 500 L, instaladas em uma estufa e abastecidas por um sistema fechado de recirculação de água. Os peixes foram alimentados ad libitum com ração seca em duas refeições diárias, por um período de 65 dias com quatro rações isoenergéticas (3.500 kcal de ED kg-1 de ração, com níveis de proteína bruta de 41%, 37%, 33% e 30% de forma a obter uma relação ED:PB de 8, 9, 10 e 11 kcal de ED g-1 de PB, estabelecendo-se um delineamento experimental inteiramente casualizado com 4 tratamentos e 4 repetições. No início do experimento um lote de peixes foi sacrificado para determinação dos teores corporais de proteína, gordura, água e matéria mineral. No final do período experimental, foram sacrificados lotes de peixes de cada tratamento para nova análise de composição corporal. Os dados obtidos foram submetidos à análise de variância utilizando-se do software SAS, e aplicando-se regressão polinomial para avaliar o efeito das relações ED:PB nas variáveis analisadas ao nível de 5% de probabilidade. Os resultados permitem inferir que a exigência nutricional do tucunaré pode ser suprida por uma ração contendo entre 8 e 9 kcal de ED g-1 de PB, ou seja, 37 a 41% de PB e 3.500 kcal de ED kg-1 de alimento.

  8. Planeamento de uma estrada utilizando CCS Candy - Caso de estudo

    OpenAIRE

    Oliveira, Sara Maria de

    2013-01-01

    O tema desta dissertação foi escolhido tendo em consideração a crescente necessidade de planeamento de empreitadas de construção de estradas, sendo um dos objetivos desta dissertação o de oferecer uma visão global do processo de planeamento da construção de uma estrada, focado apenas no fator tempo, recorrendo a ferramentas informáticas e utilizando um caso de estudo de uma estrada real e já construída. Inicialmente, faz-se uma breve descrição dos métodos de planeamento mais aplicados em p...

  9. CONSUMO DE ENERGIA ELÉTRICA: UMA ANÁLISE DE FONTE ALTERNATIVA DE COLETOR SOLAR DE BAIXO CUSTO

    OpenAIRE

    Ramon Alves de Oliveira; Murillo Ribeiro de Moura

    2015-01-01

    Com o aumento do consumo de energia elétrica e tarifas, a procura por geração de energias alternativas vem crescendo gradativamente, principalmente que sejam de baixo custo, assim possibilitando uma maior inclusão social beneficiando também as residências de baixa renda. Com o espírito de inovação a pesquisa buscou ideias simples que possam contribuir para a sociedade buscando alternativas sustentáveis e de baixo custo para a economia de energia elétrica Esse artigo teve como obje...

  10. Aproveitamento do exercício físico como fonte de energia renovával

    OpenAIRE

    Cardoso, Nelson Jorge Rocha Marques

    2009-01-01

    Este trabalho pretende ser um contributo para a área das Energias Renováveis. A utilização dos equipamentos de exercício físico que se encontram em ginásios comuns gera uma determinada quantidade de energia que é desperdiçada. A ideia chave deste projecto é aproveitar parte dessa energia e inseri-la na rede eléctrica. Para esse efeito construiu-se um protótipo baseado num rolo de treino que acciona um gerador DC onde se pode acoplar qualquer bicicleta comum e produzir energi...

  11. Fluoride Rinses, Gels and Foams

    DEFF Research Database (Denmark)

    Twetman, Svante; Keller, Mette K

    2016-01-01

    AIM: The aim of this conference paper was to systematically review the quality of evidence and summarize the findings of clinical trials published after 2002 using fluoride mouth rinses, fluoride gels or foams for the prevention of dental caries. METHODS: Relevant papers were selected after...... (6 on fluoride mouth rinse, 10 on fluoride gel and 3 on fluoride foam); 6 had a low risk of bias while 2 had a moderate risk. All fluoride measures appeared to be beneficial in preventing crown caries and reversing root caries, but the quality of evidence was graded as low for fluoride mouth rinse......, moderate for fluoride gel and very low for acidulated fluoride foam. No conclusions could be drawn on the cost-effectiveness. CONCLUSIONS: This review, covering the recent decade, has further substantiated the evidence for a caries-preventive effect of fluoride mouth rinse, fluoride gel and foam...

  12. Electric power conservation while using pumping systems; Conservacion de Energia Electrica en Sistemas de Bombeo

    Energy Technology Data Exchange (ETDEWEB)

    Nambiar, P

    2007-01-15

    The pumping systems provide about 20 to 25 percent of energy which is necessary worldwide: it is fruitful to understand how to use electric power efficiently, to achieve the reduction regarding expenses a pumping system implies.It is essential to possess a better knowledge about the pumping system and its applications, in order to be able to use energy responsibly. If people do not how to operate this kind of systems properly, they will use inadequate equipment that will cause an energy waste. In addition it is important to know: alternative methods to meet variable demands, an adapted system to pump water requirements in order to ensure the pump work in its pumping point, and the life cycle system cost for the energy saving in the long term. [Spanish] En promedio del 20 al 25% de la energia necesaria en el mundo proviene de los sistemas de bombeo, por tal razon es importante saber como utilizar la energia electrica con eficiencia para asi lograr reducir los gastos que este tipo de sistemas implican. Para poder hacer un buen uso de la energia, es necesario que se tenga un conocimiento mayor del sistema de bombeo y aplicacion, ya que la ignorancia sobre esto exige el uso de aparatos que contribuyen al desperdicio de la energia; por otro lado tambien es esencial conocer metodos alternos para demandas variables, tener un sistema que se adapte a las necesidades de bombeo del agua para asegurarse de que cada bomba trabaje cerca de su punto de bombeo y finalmente conocer el costo del ciclo de vida del sistema para el ahorro de energia a largo plazo.

  13. Injectable gels for tissue engineering.

    Science.gov (United States)

    Gutowska, A; Jeong, B; Jasionowski, M

    2001-08-01

    Recently, tissue engineering approaches using injectable, in situ gel forming systems have been reported. In this review, the gelation processes and several injectable systems that exhibit in situ gel formation at physiological conditions are discussed. Applications of selected injectable systems (alginate, chitosan, hyaluronan, polyethylene oxide/polypropylene oxide) in tissue engineering are also described. Injectable polymer formulation can gel in vivo in response to temperature change (thermal gelation), pH change, ionic cross-linking, or solvent exchange. Kinetics of gelation is directly affected by its mechanism. Injectable formulations offer specific advantages over preformed scaffolds such as: possibility of a minimally invasive implantation, an ability to fill a desired shape, and easy incorporation of various therapeutic agents. Several factors need to be considered before an injectable gel can be selected as a candidate for tissue engineering applications. Apart from tissue-specific cell-matrix interactions, the following gel properties need to be considered: gelation kinetics, matrix resorption rate, possible toxicity of degradation products and their elimination routes, and finally possible interference of the gel matrix with histogenesis. Copyright 2001 Wiley-Liss, Inc.

  14. Estudi de l’energia geotèrmica a Catalunya i la seva implementació a l’edificació. Comparativa amb l’energia solar tèrmica

    OpenAIRE

    Roca Subirana, Laura

    2010-01-01

    Aquest projecte pretén analitzar l’estat actual de l’energia geotèrmica a Catalunya i estudiarne la seva implementació en l’edificació. A més, pretén realitzar un estudi comparatiu entre aquesta energia renovable i l’energia solar tèrmica. Primerament, es realitza un balanç sobre el consum i la producció actuals d’energia a Catalunya. Aquest balanç es complementa amb una incisió sobre l’estat actual de les energies renovables a Catalunya, com també el futur que se’ls hi depara....

  15. L'uso pacifico dell'energia nucleare da Ginevra 1955 ad oggi : il caso italiano : atti del convegno

    CERN Document Server

    2007-01-01

    Energia e sviluppo (le fonti energetiche) ; l'Italia e l'opzione nucleare ; stato a prospettive delle tecnologie nucleari ; reattori nucleari di nuova generazione ; tecniche nucleari in biologia, medicina biochimica, agraria e beni culturali ; sicurezza e ambiente.

  16. Management report 2003 CNEN - Brazilian Nuclear Energy Commission; Relatorio de gestao 2003 CNEN - Comissao Nacional de Energia Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-03-15

    This document reports the general activity management of the Comissao Nacional de Energia Nuclear - CNEN - Brazil during the year of 2003, involving the government programs in the areas of nuclear safety, medicine application, technological development, administration and miscellaneous.

  17. Börs nutab taga Eesti Energia loobumist / Jaana Pikalev ; kommenteerinud Jürgen Ligi, Sandor Liive

    Index Scriptorium Estoniae

    Pikalev, Jaana

    2010-01-01

    SEB privaatpanganduse osakonna strateeg Peeter Koppel, LHV Panga analüütik Sten Pisang, investor Stefan Andresson avaldavad arvamust seoses otsusega Eesti Energia veel mitte börsile viia. Majandus- ja kommunikatsiooniminister Juhan Partsi arvamus

  18. Recubrimientos de hidroxiapatita preparados mediante un proceso sol-gel

    Directory of Open Access Journals (Sweden)

    Peón, E.

    2005-12-01

    Full Text Available Hydroxyapatite coatings (HAp have been obtained starting from precursors of sol-gel type. The coatings previously oxidized were deposited on metal surfaces of a based on iron alloy so-called MA956. The alloys were at high temperatures, in order to improve the adhesion with the hydroxyapatite coatings. The sol-gel coating was obtained applying an aqueous route, using triethyl phosphite and aqueous calcium nitrate, as precursors of phosphorous and calcium, respectively. Different sintering thermal treatments were applied on the resulting gels in order to obtain a homogeneous, adherent and crystalline hydroxyapatite coating. The characterization techniques used for this study were optical microscopy, SEM/EDX, XDR and FTIR. Moreover, the adhesion between the hydroxylapatite coating and the substrate was assessed according to the ASTM D 3359-02 standard test method. The results of this study showed that the best thermal treatment is obtained for a sintering temperature of 550 °C during a time of 72 h.

    Se han preparado nuevos recubrimientos de hidroxiapatita (HAp obtenidos a partir de precursores de tipo sol-gel, depositados sobre sustratos metálicos de una aleación de base hierro denominada MA956, previamente oxidados a elevadas temperaturas, para mejorar la adherencia con los recubrimientos de hidroxiapatita. El recubrimiento sol-gel se obtuvo aplicando una ruta acuosa, utilizando como precursores del fósforo y del calcio trietilfosfito y nitrato cálcico tetrahidratado, respectivamente. Sobre los geles resultantes se aplicaron distintos tratamientos térmicos de sinterización, hasta la obtención de recubrimientos de hidroxiapatita homogéneos, adherentes y cristalinos. Las técnicas de caracterización utilizadas para realizar este estudio han sido microscopía óptica, MBE/EDX, DRX y FTIR. Así mismo, se ha determinado la adherencia entre el substrato y el recubrimiento de hidroxiapatita según la norma ASTM D 3359-02. Los resultados

  19. Análise e estimativa dos componentes do balanço de energia em ecossistema de manguezal amazônico Analysis and estimation of energy balance components in amazonian mangrove ecosystem

    Directory of Open Access Journals (Sweden)

    Priscila Lima Pereira

    2013-03-01

    Full Text Available As medições e estimativas dos componentes do balanço de energia foram feitos acima da copa das árvores no ecossistema de manguezal natural, localizada a 30 km da cidade de Bragança-PA, entre novembro de 2002 e agosto de 2003. Os dados foram utilizados para a análise das variações sazonais e horárias do fluxo de calor sensível e calor latente, bem como a avaliação da partição de energia. Os dados meteorológicos foram coletados pela estação meteorológica automática (EMA e os fluxos foram calculados utilizando-se a técnica de covariância de vórtices turbulentos. Os modelos de Penman-Monteith e Shuttleworth foram usados ​​para estimar o fluxo de calor sensível e calor latente. O objetivo deste estudo foi analisar o equilíbrio e a partição de energia no manguezal, assim como fazer uma avaliação do comportamento de modelos empíricos para estimar os fluxos de energia. O saldo de radiação apresentou valores mais elevados no período menos chuvoso. A razão de Bowen mostrou valor geralmente baixo, o que indica que uma proporção maior de energia foi utilizada sob a forma de calor latente. O modelo Shuttleworth é mais eficiente na estimativa de fluxos de calor sensível. Para estimar o fluxo de calor latente do modelo de Penman-Monteith foi mais eficiente durante a estação seca e o modelo Shuttleworth durante a estação chuvosa.Measurements and estimates of the components of energy balance were made above the canopy of trees in natural mangrove ecosystem, located 30 km from the city of Bragança-PA, between November 2002 and August 2003. The data were used in the analysis of seasonal and hourly variations of the sensible and latent heat flows, as well as the evaluation of the energy partition. Meteorological data were collected by the automatic weather station (AWS and the energy flows were calculated using the technique of eddy covariance. The Penman-Monteith and Shuttleworth models were used to estimate the

  20. The use of residual geothermal energy in an edible mushroom production plant, Los Humeros geothermal fields (Mexico): Achievements and alternatives; El uso de la energia geotermica residual en la planta productora de hongos comestibles del campo geotermico Los Humeros (Mexico): Logros y alternativas

    Energy Technology Data Exchange (ETDEWEB)

    Rangel Rangel, Maria Elena [Proteccion ambiental, Puebla (Mexico)

    2000-12-01

    A plant for raising edible mushrooms with residual geothermal energy is a project of the Comision Federal de Electricidad (CFE). The results reflect important achievements in the development of technology for the productions of wholesome and available food with geothermal heat instead of conventional energy sources. The installations have an enormous technological and commercial potential- demonstrated by the cultivation of oyster mushrooms (Pleurotus ostreatus), which success has awakened the interest of research institutions. The Instituto of Ecologia, A.C., has begun a joint project with CFE cultivating shiitake mushrooms (Lentinula edodes) with geothermal energy. These achievements mark a clear trend toward the integral use of facilities, the establishment of a crop with greater economic advantages, and the diffusion of this project. [Spanish] La planta productora de hongos comestibles es un proyecto de la Comision Federal de Electricidad (CFE) para dar un uso alterno a la energia geotermica residual. Los resultados obtenidos hasta el momento reflejan logros importantes en la generacion de tecnologia propia para la produccion de un alimento sano y accesible, sustituyendo la energia proveniente de combustibles convencionales por calor geotermico. Las instalaciones creadas cuentan con un enorme potencial tecnologico y comercial demostrando con el cultivo de las setas (Pleurotus ostreatus) con un exito tal que ha despertado el interes de instituciones dedicadas a la investigacion. Tal es el caso de Instituto de Ecologia, A.C que acualmente se encuentra involucrado en un proyecto conjunto sobre el cultivo del hongo Lentinula edodes (shiitake) utilizando energia geotermica en su proceso productivo. Con lo anterior, se esta marcando una clara tendencia hacia el aprovechamiento integral de las instalaciones, el establecimiento de un cultivo con mayores ventajas economicas y la difusion de este proyecto.

  1. Consumo de combustível e emissões de poluentes em um motor Diesel convertido a etanol para geração térmica de energia elétrica

    Directory of Open Access Journals (Sweden)

    Vinícius Rückert Roso

    2016-03-01

    Full Text Available Nos esforços globais para a minimização nas emissões de gases do efeito estufa e redução da pegada de carbono, combustíveis renováveis têm sido extensivamente utilizados em substituição aos combustíveis fósseis nos motores de combustão interna. Particularmente para geração de energia elétrica local, motores diesel são os mais utilizados devido à elevada eficiência térmica e a robustez, se comparado a motores de ignição por centelha. Entretanto, estes sistemas apresentam elevados níveis de emissões de óxido de nitrogênio (NOx e material particulado, trazendo sérias consequências para o meio ambiente. Assim, esta pesquisa combina simulação computacional e resultados experimentais da conversão de um motor diesel para a operação com etanol, sendo sua utilização na geração de energia elétrica. Como este combustível renovável é largamente produzido no Brasil utilizando a cana-de-açúcar, acaba por possuir seu custo reduzido em especial próximo à produtores e refinarias. Dados experimentais foram utilizados na validação do modelo computacional unidimensional desenvolvido para a conversão, onde resultados foram analisados para a comparação de ambos combustíveis. Análises econômicas para diferentes condições de carga forneceram informações de custos operacionais em locais próximos às fontes de produção de etanol. Os resultados apontam as vantagens no uso do combustível renovável para a geração de energia elétrica, como o custo reduzido e a menor emissão de NOx ao longo de toda a gama de operação.

  2. Eesti Energia: valitsus võtab aja maha ja laseb börsimõttel veel settida / Raimo Poom

    Index Scriptorium Estoniae

    Poom, Raimo

    2010-01-01

    Täna valitsuskabinetis toimuv arutelu ei paista keskenduvat mitte sellele, kas Eesti Energia börsile viimise plaan on hea või halb, vaid pigem sellele, kui kiire Eesti Energial oma plaanide rahastamisega on ning kas kõik ettevõtte soovid lähevad riigi eesmärkidega kokku. Eesti Energia investeeringute kava tekitab praegu rohkem küsimusi kui rahastamine

  3. Bleach gel: a simple agarose gel for analyzing RNA quality.

    Science.gov (United States)

    Aranda, Patrick S; LaJoie, Dollie M; Jorcyk, Cheryl L

    2012-01-01

    RNA-based applications requiring high-quality, non-degraded RNA are a foundational element of many research studies. As such, it is paramount that the integrity of experimental RNA is validated prior to cDNA synthesis or other downstream applications. In the absence of expensive equipment such as microfluidic electrophoretic devices, and as an alternative to the costly and time-consuming standard formaldehyde gel, RNA quality can be quickly analyzed by adding small amounts of commercial bleach to TAE buffer-based agarose gels prior to electrophoresis. In the presence of low concentrations of bleach, the secondary structure of RNA is denatured and potential contaminating RNases are destroyed. Because of this, the 'bleach gel' is a functional approach that addresses the need for an inexpensive and safe way to evaluate RNA integrity and will improve the ability of researchers to rapidly analyze RNA quality. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  4. Energia metabolizável de ingredientes determinada com codornas japonesas (Coturnix coturnix japonica Metabolizable energy of feedstuffs determined in japanese quails (Coturnix coturnix japonica

    Directory of Open Access Journals (Sweden)

    José Humberto Vilar da Silva

    2003-12-01

    Full Text Available O experimento um foi realizado para determinar a energia metabolizável aparente (EMA e corrigida pelo balanço de nitrogênio (EMAn de nove alimentos utilizando codornas japonesas em crescimento. No experimento dois, objetivou-se comparar formulações de rações utilizando EMAn do milho e do farelo de soja determinada para frangos de corte e poedeiras, com aquelas determinadas com codornas com 22 a 27 dias de idade e 65 dias de idade. No experimento um, foram utilizadas 400 codornas em crescimento recebendo uma dieta basal (DB e nove misturas compostas por 70% da DB + 30% dos alimentos testes, totalizando dez tratamentos, cada um com quatro repetições de dez aves. No experimento dois, 160 codornas européias em postura receberam três tratamentos durante três períodos de 15 dias de duração, com doze repetições de cinco aves. Os valores de EMA e EMAn (kcal/kg determinados para os alimentos de origem vegetal foram, respectivamente, 3.340 e 3.354 para o milho moído, 2.718 e 2.456 para o farelo de soja, 3.453 e 3.084 para a soja integral extrusada, 1.624 e 1.593 para o farelo de trigo, 4.558 e 3.992 para o farelo de glúten de milho, 3.329 e 3.378 para a farinha de mandioca e 1.238 e 1.223 para a farinha integral da vagem de algaroba e para os alimentos de origem animal, respectivamente, de 2874 e 2453 para a farinha de peixe e 3090 e 2791 para a farinha de vísceras. A EMAn do milho e do farelo de soja estimada com codornas não melhorou o consumo, produção, peso e conversão por massa de ovos, validando o uso da energia desses ingredientes determinada com frangos de corte e poedeiras para compor rações para codornas.The experiment one was carried out to determine apparent metabolizable energy (AME and nitrogen-corrected ME (AMEn of nine feedstuffs in Japanese quails. The objective of the experiment two was to compare diets formulated with AMEn of corn and soybean meal, usually fed to broilers and laying hens, with diets formulated

  5. Bacterial community structure of mangrove sediments in relation to environmental variables accessed by 16S rRNA gene-denaturing gradient gel electrophoresis fingerprinting

    OpenAIRE

    Yanying Zhang; Junde Dong; Bin Yang; Juan Ling; Youshao Wang; Si Zhang

    2009-01-01

    La estructura de la comunidad bacteriana y la relación entre variables ambientales y las comunidades microbianas de la superficie de sedimentos de los ecosistemas tropicales de manglares fueron investigados en Sanya, Hainan Island, China. Los perfiles de las comunidades bacterianas fueron obtenidos utilizando electroforesis de gradiente de gel desnaturalizante (DGE), cultivo-independiente, y los resultados fueron interpretados con un análisis estadístico multivariante. Los resultados sugerían...

  6. Measurement of electrical energy and typification of end uses in the domestic sector; Medicion de energia electrica y tipificacion de usos finales en el sector domestico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Juarez, Francisco; Maqueda Zamora, Martin Roberto [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2003-07-01

    In this work the advantages in using modern measuring equipment that allows the segregation of load curves of the domestic users using a single measuring equipment are presented, some samples of the measurements that have been obtained during measurements made to diverse domestic users are presented. Also, some other complementary technologies of recent development are mentioned that help in the application of power efficiency measures in the diverse sectors, the use of these equipment serves as a support for measuring the effectiveness of the programs of of energy saving and of the demand management that are desired to implement. The objective of this article is to demonstrate the use of the modern measuring equipment for the typification and measurement of the end uses in the domestic sector, and to present the advantages of using these equipment in the power efficiency studies. [Spanish] En este trabajo se exponen las ventajas de usar equipos de medicion modernos que permiten la desagregacion de curvas de carga de los usuarios domesticos utilizando un solo equipo de medicion, se presentan algunas muestras de las mediciones que se han obtenido durante mediciones realizadas a diversos usuarios domesticos. Tambien, se mencionan algunas otras tecnologias complementarias de reciente desarrollo que ayudan en la aplicacion de medidas de eficiencia energetica en los diversos sectores, el uso de estos equipos sirve de soporte para medir la efectividad de los programas de ahorro de energia y de administracion de la demanda que se desean implementar. El objetivo de este articulo es demostrar el uso de los equipos de medicion modernos para la tipificacion y medicion de usos finales en el sector domestico, y presentar las ventajas de usar estos equipos en los estudios de eficiencia energetica.

  7. PUBLICIDADE EM CELULARES UTILIZANDO O SISTEMA DE BUSCA DE PERFIL

    Directory of Open Access Journals (Sweden)

    Bruno Gomes de Araújo

    2010-04-01

    Full Text Available A publicidade vem causando um impacto cada vez mais perceptível na sociedade moderna, o qual se percebe nas mudanças de hábitos e costumes das pessoas. Entretanto, os atuais métodos de transmissões publicitárias estão se tornando problemáticos, devido à incorreta utilização e também devido à grande preocupação com o meio ambiente e com a qualidade de vida. Neste contexto, esse trabalho propõe a criação de um sistema para envio de mensagens publicitárias via celulares. Para tanto, utilizando um mecanismo de busca de perfil. A busca é responsável por localizar os celulares ativos, baseando-se no padrão Bluetooth. Um perfil consiste em todas as informações referentes a um usuário, as quais caracterizam os seus interesses. Após a localização e identificação do perfil o usuário receberá em seu celular mensagens de seu interesse. O processo de localização e sincronização de perfil é realizado de forma totalmente automática, aumentando assim a usabilidade do sistema.

  8. Polyacrylamide temperature gradient gel electrophoresis.

    Science.gov (United States)

    Viglasky, Viktor

    2013-01-01

    Temperature Gradient Gel Electrophoresis (TGGE) is a form of electrophoresis in which temperature gradient is used to denature molecules as they move through either acrylamide or agarose gel. TGGE can be applied to analyze DNA, RNA, protein-DNA complexes, and, less commonly, proteins. Separation of double-stranded DNA molecules during TGGE relies on temperature-dependent melting of the DNA duplex into two single-stranded DNA molecules. Therefore, the mobility of DNA reflects not only the size of the molecule but also its nucleotide composition, thereby allowing separation of DNA molecules of similar size with different sequences. Depending on the relative orientation of electric field and temperature gradient, TGGE can be performed in either a parallel or a perpendicular mode. The former is used to analyze multiple samples in the same gel, whereas the later allows detailed analysis of a single sample. This chapter is focused on analysis of DNA by polyacrylamide TGGE using the perpendicular mode.

  9. Sol-gel derived sorbents

    Science.gov (United States)

    Sigman, Michael E.; Dindal, Amy B.

    2003-11-11

    Described is a method for producing copolymerized sol-gel derived sorbent particles for the production of copolymerized sol-gel derived sorbent material. The method for producing copolymerized sol-gel derived sorbent particles comprises adding a basic solution to an aqueous metal alkoxide mixture for a pH.ltoreq.8 to hydrolyze the metal alkoxides. Then, allowing the mixture to react at room temperature for a precalculated period of time for the mixture to undergo an increased in viscosity to obtain a desired pore size and surface area. The copolymerized mixture is then added to an immiscible, nonpolar solvent that has been heated to a sufficient temperature wherein the copolymerized mixture forms a solid upon the addition. The solid is recovered from the mixture, and is ready for use in an active sampling trap or activated for use in a passive sampling trap.

  10. Determinação dos valores de energia e do balanço de nitrogênio de alguns alimentos para leitões na fase inicial Determination of energy values and nitrogen balance of some feeds for the young pigs

    Directory of Open Access Journals (Sweden)

    Teresinha Marisa Bertol

    1999-01-01

    Full Text Available Este trabalho foi realizado para obter valores de energia digestível (ED e metabolizável (EM de quatorze alimentos, em cinco experimentos, utilizando-se 144 leitões com 28 dias de idade e peso médio de 9,42±0,76 kg. O teor de energia digestível (ED e o de energia metabolizável (EM foram determinados por intermédio do método de coleta total de fezes e urina. As fontes de proteína provenientes do leite foram superiores aos subprodutos da soja, com relação à digestibilidade da energia e da proteína. Entre os subprodutos da soja, a proteína concentrada e a proteína texturizada apresentaram os maiores valores de digestibilidade da energia e a soja integral extrusada, os menores. A digestibilidade da matéria seca e da energia do milho e do farelo de soja com 46,5% de proteína bruta foi semelhante à observada em avaliações com suínos adultos, indicando que a capacidade dos leitões jovens para digerir estes dois alimentos foi semelhante à dos suínos adultos. Houve redução da relação EM/ED, em virtude do aumento do teor de proteína e do desequilíbrio entre os aminoácidos da dieta e diminuição da relação entre energia bruta e N excretados na urina, com aumento do teor de proteína da dieta e vice-versa. Estes dados indicam a necessidade de se desenvolverem fatores de correção para EM específicos para diferentes grupos de alimentos e condições de experimentação.The objective of this work was to determine the digestible (DE and metabolizable (ME energy values of some feeds for weaned pigs. Fourteen feeds were evaluated in five experiments, using 144 piglets with an average initial weight of 9.42+0.76 kg at 28 days of age. The DE and ME contents were determined by means of the total collection of feces and urine method. The protein sources from milk had higher energy and protein digestibility than soybean by products. Among these, concentrated protein and textured protein had the highest energy digestibility, and

  11. Estudo experimental do excesso da energia livre de Gibbs dos sistemas ciclohexano e N-hexano/2-butanol entre 323,15 e 348,15 K

    OpenAIRE

    Marilena Emmi Araujo

    1990-01-01

    Resumo: O objetivo principal deste trabalho foi a determinação experimental do excesso da energia livre de Gibbs de sistemas binários do tipo hidrocarboneto/álcool. A seleção dos sistemas teve como critérios a expansão de informações experimentais sobre o excesso da energia livre de Gibbs e um estudo sistemático do comportamento do excesso da energia livre de Gibbs face à variação da temperatura e à modificação da cadeia do hidrocarboneto. O excesso da energia livre de Gibbs foi determinado a...

  12. Energia, Geopolítica e a Política da Biosfera

    OpenAIRE

    Schwarz, Henrique

    2007-01-01

    O quadro global da distribuição geográfica das reservas geológicas e da produção e consumo dos combustíveis fósseis, que são hoje de longe as principais fontes de energia a nível mundial, é cada vez mais propício à emergência e à recorrência de conflitos distributivos, conhecidos por “guerras dos recursos” ou simplesmente por guerras do petróleo. Para além disto, uma oferta de energia que não consegue acompanhar o crescimento da procura faz subir os preços de uma forma ...

  13. Fome de energia? Do desperdício à poupança

    OpenAIRE

    Malico, Isabel

    2013-01-01

    A intensificação das atividades económicas a nível mundial e o aumento da população amplificam alguns dos problemas ambientais que a humanidade enfrenta hoje em dia. Alguns deles prendem-se com a conversão e utilização de energia. No seu relatório anual de 2012, a Agência Internacional de Energia refere que em 2035 as necessidades energéticas mundiais serão mais de 1/3 superiores às atuais [1]. Nos países da OCDE as necessidades energéticas aumentarão pouco, mas assistir-se-á até 2035 a uma c...

  14. Estratégias de investimento em mercados liberalizados de energia elétrica

    OpenAIRE

    Ramalho, António

    2014-01-01

    Dissertação para obtenção do grau de Mestre em Engenharia Electrotécnica Ramo Energia Com a introdução da concorrência no setor de produção de eletricidade, o processo de decisão de investimento na geração de energia mudou drasticamente. Agora, os investimentos são a consequência de decisões individuais com o objetivo de maximizar o lucro da empresa. As decisões de investimento têm um forte impacto sobre os resultados a longo prazo de empresas de geração, pois estas...

  15. Eesti Energia IPO nõuab sadu miljoneid kroone / Sulev Vedler

    Index Scriptorium Estoniae

    Vedler, Sulev, 1970-

    2009-01-01

    Valitsus ei otsustanud, kas müüa Eesti Energia uued aktsiad maha börsi kaudu või osta need ise ära. Peaministri majandusnõuniku Aare Järvani sõnul on tegemist olulise poliitilise otsusega ja see ei tohi tekitada rahvas pahameelt. Autori sõnul võidaks börsiplaan poolehoidu näiteks siis, kui firma töötajad ja jaekliendid saaksid osta aktsiaid soodustingimustel

  16. Europa, energia e geoeconomia: infraestruturas prioritárias e novas soluções

    OpenAIRE

    Ribeiro, José Félix

    2012-01-01

    Em 2010 a Comissão Europeia avançou com a proposta de um conjunto de corredores e interconexões europeias na área da energia, que culmina um processo de definição gradual de uma estratégia geoeconómica para garantir maior segurança energética e sustentabilidade

  17. Energy saving and efficiency in building; Ahorro de energia y eficiencia en edificios

    Energy Technology Data Exchange (ETDEWEB)

    Perez Sanchez, Maria M. [Universidad Autonoma de Yucatan, Merida, Yucatan (Mexico); Pacheco Aguilar, Francisco [Comision Federal de Electricidad, (Mexico)

    2000-07-01

    High energy consumption is one of the serious problems in the world today. Newly, this question has taken on not only economic, but also social and ecological importance. In order to reduce the amount of fossil energy, energy diagnosis are one of the most useful tools for increasing the energy efficiency in buildings. In the Faculty of Engineering, dependency of the Universidad Autonoma de Yucatan, Mexico a program of energy diagnosis was developed under an ongoing project entitled energy savings program, which begun in 1996. This paper describes a methodology about diagnosis building energy consumption building shell and energy efficiency in a case study. No doubt future developments are likely to lead to changes in the estimates. We hope that, nevertheless, this study will contribute to increased energy efficiency in this Faculty. [Spanish] En el mundo actual, uno de los problemas mas serios que se tienen es el elevado consumo de energia, que no solamente representa un problema economico sino que tambien abarca aspectos de indole social y ecologica. Con el fin de reducir el alto costo de la energia fosil, el diagnostico de energia es una de las herramientas mas poderosas para promover la eficiencia de los edificios. En la Facultad de Ingenieria, dependencia de la Universidad Autonoma de Yucatan, Mexico se esta llevando a efecto un diagnostico energetico perteneciente al programa de ahorros de energia que comenzo en el ano de 1996. En este estudio se describe una metodologia de diagnostico de ahorro energetico y eficiencia energetica de la envolvente termica en un estudio del caso, aplicado a los edificios de la Facultad de Ingenieria (FIUADY).

  18. Obtaining energy from waste; La obtencion de energia a partir de residuos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia-Zayas, J.; Villarrubia Lopez, M.

    2008-07-01

    During the April 2008 Environmental Management seminar, dedicated to how obtaining of energy from waste, supported by Gas Natural, a book La Recuperation energia eco-efficient de los residues. Potential in Spain was presented, and multiple offers were exposed to use in Spain the waste with energetic purposes, especially in Catalonia. One example to take advantage of the waste was a practical case: waste conversion in synthesis gas by plasma. (Author)

  19. Screening effect on nanostructure of charged gel

    DEFF Research Database (Denmark)

    Sugiyama, M; Annaka, M; Hino, M

    2004-01-01

    Charge screening effects on nanostructures of N-isopropylacrylamide-sodium acrylate (NIPA-SA) and -acrylic acid (NIPA-AAc) gels are investigated with small-angle neutron scattering. The NIPA-SA and NIPA-AAc gels with low water content exhibit microphase separations with different dimensions....... The dehydrated NIPA-SA gel also makes the microphase separation but the dehydrated NIPA-AAc gel does not. These results indicate that ionic circumstance around charged bases strongly affects the nanostructures both of the dehydrated gel and the gel with low water content. (C) 2004 Elsevier B. V. All rights...

  20. Screening effect on nanostructure of charged gel

    International Nuclear Information System (INIS)

    Sugiyama, Masaaki; Annaka, Masahiko; Hino, Masahiro; Fukunaga, Toshiharu; Vigild, Martin E.; Hara, Kazuhiro

    2004-01-01

    Charge screening effects on nanostructures of N-isopropylacrylamide-sodium acrylate (NIPA-SA) and -acrylic acid (NIPA-AAc) gels are investigated with small-angle neutron scattering. The NIPA-SA and NIPA-AAc gels with low water content exhibit microphase separations with different dimensions. The dehydrated NIPA-SA gel also makes the microphase separation but the dehydrated NIPA-AAc gel does not. These results indicate that ionic circumstance around charged bases strongly affects the nanostructures both of the dehydrated gel and the gel with low water content

  1. Screening effect on nanostructure of charged gel

    Science.gov (United States)

    Sugiyama, Masaaki; Annaka, Masahiko; Hino, Masahiro; Fukunaga, Toshiharu; E. Vigild, Martin; Hara, Kazuhiro

    2004-07-01

    Charge screening effects on nanostructures of N-isopropylacrylamide-sodium acrylate (NIPA-SA) and -acrylic acid (NIPA-AAc) gels are investigated with small-angle neutron scattering. The NIPA-SA and NIPA-AAc gels with low water content exhibit microphase separations with different dimensions. The dehydrated NIPA-SA gel also makes the microphase separation but the dehydrated NIPA-AAc gel does not. These results indicate that ionic circumstance around charged bases strongly affects the nanostructures both of the dehydrated gel and the gel with low water content.

  2. Techniques of thermal energy conservation; Tecnicas de conservacion de la energia termica

    Energy Technology Data Exchange (ETDEWEB)

    Caltenco Estevez, Juan Luis; Roblez Lopez, Francisco; Ceballos Serna, Andres Alberto [Instituto Mexicano del Petroleo (Mexico)

    1996-07-01

    In modern industry the thermal energy is the energy more intensely used, which implies that in the processes and equipment that operate based on it, rely the greatest opportunities for saving . In this paper some saving and conservation techniques of thermal energy, which nowadays have been developed, are presented, whose application has helped to the successful attainment of the objectives of increased productivity of industrial plants, with the additional benefit of reducing the environmental impact of the production activities. [Spanish] En la industria moderna la energia termica es la forma de energia mas intensamente utilizada, lo cual implica que en los procesos y equipos que operan basandose en esta, residan las mayores oportunidades de ahorro. En este trabajo se presentan algunas de las tecnicas de ahorro y conservacion de energia termica, que hoy en dia se han desarrollado, cuya aplicacion ha coadyuvado a la consecucion exitosa de los objetivos de incremento de la productividad de plantas industriales, con el beneficio adicional de reducir el impacto ambiental de las actividades productivas.

  3. Asymptotic energies and sustainable electrical development; Energias asintoticas y desarrollo electrico sustentable

    Energy Technology Data Exchange (ETDEWEB)

    Velez O, Carlos [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2003-07-01

    A review is made of the energy resources in use existing at the moment for the electricity production (hydraulic, coal, oil, gas and uranium). The asymptotic energies (solar, geothermal and nuclear fission and fusion) are described and the state of development in which they are up to the moment. One concludes that in the case of Mexico it would be convenient to make flexible and to reinforce the electrical systems in forecast of a greater participation of the distributed generation and to orient the extensions of the electrical generation to make a greater use of the three asymptotic energies already used: the solar (in its forms hydraulic and wind power), geothermal and the nuclear fission. [Spanish] Se pasa revista a los recursos existentes en las energias actualmente en uso para la produccion de electricidad (hidraulica, carbon, petroleo, gas y uranio). Se describen las energias asintoticas (solar, geotermia y fision y fusion nucleares) y el estado de desarrollo en que se encuentran hasta el momento. Se concluye que en el caso de Mexico convendria flexibilizar y reforzar el sistema electrico en prevision de una mayor participacion de la generacion distribuida y orientar las ampliaciones de la generacion electrica para hacer un mayor uso de tres de las energias asintoticas ya utilizadas: la solar (en sus formas hidraulica y eolica), la geotermia y la fision nuclear.

  4. Demanda residencial de energia elétrica em Minas Gerais: 1970-2002

    Directory of Open Access Journals (Sweden)

    Leonardo Bornacki de Mattos

    2009-06-01

    Full Text Available Este trabalho teve como objetivo obter uma estimativa para a demanda residencial de energia elétrica em Minas Gerais, no período de 1970 a 2002. Especificamente, pretendeu-se estimar a elasticidade-preço e a elasticidaderenda dessa demanda. Após identificar que as séries estudadas eram não-estacionárias, optou-se pela utilização do conceito de cointegração, sendo estimado um Modelo de Correção de Erros Vetoriais (VEC Model. Os resultados obtidos mostraram que a demanda estudada é mais sensível a variações na renda que no preço da energia elétrica, embora tanto a elasticidade-renda quanto a elasticidade-preço se mostraram inferiores à unidade. Conclui-se também que esta última elasticidade émaior em MinasGerais que no Brasil, sugerindo padrões diferenciados de consumo dessa energia entre os diversos Estados do País.

  5. Obtención de Cordierita por Sol-Gel a partir de fuentes nacionales cubanas

    Directory of Open Access Journals (Sweden)

    Pacheco, P.

    2003-10-01

    Full Text Available For cordierite synthesis through the Sol-Gel method, the sodium silicate obtained from the dissolution of a solid residue coming from the aluminum sulfate production based on kaolin, was used. The sources of magnesium and aluminum were obtained using the technologies previously developed by CIPIMM. The elements were mixed in a determined order and quantity to obtain a Gel with cordierite stechiometry. The gel was washed and dried and briquettes were made to treat them at different temperatures, obtaining cordierite in a major phase at 1200ºC. This was checked through the X-Ray diffraction analysis of the products coming from the thermical treatment. The method used when compared to the traditional ones, permitted to reduce crystallization temperature, obtaining more dense products and clean technology.

    Para la síntesis de la Cordierita por el método de Sol-Gel se utilizó, el silicato de sodio, obtenido de la disolución de un residuo sólido proveniente de la producción de sulfato de aluminio a partir de caolín. Los precursores de magnesio y aluminio fueron obtenidos utilizando las tecnologías previamente desarrolladas por el CIPIMM. Los materiales fueron mezclados en un orden y cantidad determinada hasta obtener el Gel con estequiometría de cordierita. El gel fue lavado, secado, briqueteado y tratado térmicamente a diferentes temperaturas, lográndose cordierita en fase mayoritaria a los 1200 ºC, lo cual fue corroborado mediante el análisis por difracción de rayos X de los productos del tratamiento térmico. El método utilizado comparado con los tradicionales permitió reducir la temperatura de cristalización, obtener productos más densificados y tecnología limpia.

  6. Nonlinear elasticity of alginate gels

    Science.gov (United States)

    Hashemnejad, Seyed Meysam; Kundu, Santanu

    Alginate is a naturally occurring anionic polysaccharide extracted from brown algae. Because of biocompatibility, low toxicity, and simple gelation process, alginate gels are used in biomedical and food applications. Here, we report the rheological behavior of ionically crosslinked alginate gels, which are obtained by in situ gelation of alginates with calcium salts, in between two parallel plates of a rheometer. Strain stiffening behavior was captured using large amplitude oscillatory shear (LAOS) experiments. In addition, negative normal stress was observed for these gels, which has not been reported earlier for any polysaccharide networks. The magnitude of negative normal stress increases with applied strain and can exceed that of the shear stress at large strain. Rheological results fitted with a constitutive model that considers both stretching and bending of chains indicate that nonlinearity is likely related to the stretching of the chains between the crosslink junctions. The results provide an improved understanding of the deformation mechanism of ionically crosslinked alginate gel and the results will be important in developing synthetic extracellular matrix (ECM) from these materials.

  7. Silica reinforced triblock copolymer gels

    DEFF Research Database (Denmark)

    Theunissen, E.; Overbergh, N.; Reynaers, H.

    2004-01-01

    The effect of silica and polymer coated silica particles as reinforcing agents on the structural and mechanical properties of polystyrene-poly(ethylene/butylene)-polystyrene (PS-PEB-PS) triblock gel has been investigated. Different types of chemically modified silica have been compared in order...

  8. ENERGIA SOLAR: ALTERNATIVA ENERGÉTICA E ECONÔMICA PARA O INSTITUTO FEDERAL DO MARANHÃO - CAMPUS BACABAL

    Directory of Open Access Journals (Sweden)

    Pedro Alves Fontes

    2016-11-01

    Full Text Available No mundo atual os tipos de produção de energias são, em sua maioria, muito poluentes e degradam o meio ambiente. A busca por energias não poluentes tornou-se a principal linha de pesquisa junto às energias alternativas, porque são abundantes na natureza e não degradam o meio ambiente, como por exemplo, a Fotovoltaica (FV. O nordeste brasileiro é uma região promissora nesse tipo de geração de energia, devido a grande incidência de irradiação solar. Bacabal, cidade central do Maranhão, encontra-se em uma boa localização em relação à Linha do Equador o que a torna favorável para o estudo de energia solar. Mostra-se neste trabalho a análise da possível implantação de um sistema FV no Instituto Federal do Maranhão (IFMA. Comprovando-se, com gráficos e tabelas simulados em plataformas nacionais, a viabilidade e a eficiência desta forma de obtenção de energia, bem como a contribuição para a preservação do meio ambiente com a não emissão de dióxido de carbono (CO2, quando se deixa de usar as energias advindas de hidrelétricas.

  9. Risk control in energy saving projects; Control de riesgo en los proyectos de ahorro de energia

    Energy Technology Data Exchange (ETDEWEB)

    Mills, Evan [Lawrence Berkeley National Laboratory, CA (United States)

    2005-10-15

    Since one of the restrictive problems when investing in energy saving is the uncertainty of obtaining the planed savings, a technique in the risk handling for energy efficiency projects, called Insurance for the Energy Saving (IES) is presented. IES economically stimulates those who implement projects for energy saving so they go beyond the normal measures and really obtain significant saving levels, thus contributing to the fulfillment of national objectives in energy saving. In order to reduce the risk of low performance in energy caused by saving projects there exist the international performance measurement and the protocol of investment (IMPVP) as well as diagnoses and starting processes, whereas in order to transfer the financial risk that a saving project represents, mechanisms such as FDIC insurance, conversion of the debt in values, Saving's Guarantees, Performance Bonuses or Guarantee Bonuses and Insurances for Energy Saving can be of great help. This article deals on the IES insurance policies, their loss control management, successful cases, benefits, particular advantages, place in the market and refers argued insurance exceptions and perception surveys. [Spanish] Dado que uno de los problemas restrictivos a la hora de invertir en el ahorro de energia es la incertidumbre de obtener los ahorros proyectados, se presenta una tecnica en el manejo del riesgo para proyectos de eficiencia energetica llamada Seguro para el Ahorro de Energia (SAE). SAE estimula financieramente a quienes implementan proyectos para el ahorro de energia con el fin de que vayan mas alla de las medidas normales y consigan niveles significativos de ahorro, contribuyendo asi al cumplimiento de objetivos nacionales de ahorro energetico. Para reducir el riesgo de bajo desempeno de energia provocados por proyectos de ahorro existe la medicion del desempeno internacional y el protocolo de inversion (IMPVP) asi como diagnosticos y procesos de arranque, mientras que para transferir el

  10. Silicone Gel-Filled Breast Implants

    Science.gov (United States)

    ... and Prosthetics Breast Implants Silicone Gel-Filled Breast Implants Share Tweet Linkedin Pin it More sharing options ... it Email Print Description: Silicone gel-filled breast implants have a silicone outer shell that is filled ...

  11. Surface grafted chitosan gels. Part II. Gel formation and characterization

    DEFF Research Database (Denmark)

    Liu, Chao; Thormann, Esben; Claesson, Per M.

    2014-01-01

    Responsive biomaterial hydrogels attract significant attention due to their biocompatibility and degradability. In order to make chitosan based gels, we first graft one layer of chitosan to silica, and then build a chitosan/poly(acrylic acid) multilayer using the layer-by-layer approach. After...... detachment and decomposition. The chemical reaction between gluteraldehyde, the cross-linking agent, and chitosan was followed in situ using total internal reflection Raman (TIRR) spectroscopy, which provided a molecular insight into the complex reaction mechanism, as well as the means to quantify the cross......-linking density. The amount of poly(acrylic acid) trapped inside the surface grafted films was found to decrease with decreasing cross-linking density, as confirmed in situ using TIRR, and ex situ by Fourier transform infrared (FTIR) measurements on dried films. The responsiveness of the chitosan-based gels...

  12. Yield stress determination of a physical gel

    DEFF Research Database (Denmark)

    Hvidt, Søren

    2013-01-01

    Pluronic F127 solutions form gels in water with high elastic moduli. Pluronic gels can, however, only withstand small deformations and stresses. Different steady shear and oscillatory methods traditionally used to determine yield stress values are compared. The results show that the yield stresse...... values of these gels depend on test type and measurement time, and no absolute yield stress value can be determined for these physical gels....

  13. Physical Properties of Silicone Gel Breast Implants.

    Science.gov (United States)

    Jewell, Mark L; Bengtson, Bradley P; Smither, Kate; Nuti, Gina; Perry, TracyAnn

    2018-04-28

    Surgical applications using breast implants are individualized operations to fill and shape the breast. Physical properties beyond shape, size, and surface texture are important considerations during implant selection. Compare form stability, gel material properties, and shell thickness of textured shaped, textured round, and smooth round breast implants from 4 manufacturers: Allergan, Mentor, Sientra, and Establishment Labs through bench testing. Using a mandrel height gauge, form stability was measured by retention of dimensions on device movement from a horizontal to vertical supported orientation. Dynamic response of gel material (gel cohesivity, resistance to gel deformation, energy absorption) was measured using a synchronized target laser following application of graded negative pressure. Shell thickness was measured using digital thickness gauge calipers. Form stability, gel material properties, and shell thickness differed across breast implants. Of textured shaped devices, Allergan Natrelle 410 exhibited greater form stability than Mentor MemoryShape and Sientra Shaped implants. Allergan Inspira round implants containing TruForm 3 gel had greater form stability, higher gel cohesivity, greater resistance to gel deformation, and lower energy absorption than those containing TruForm 2 gel and in turn, implants containing TruForm 1 gel. Shell thickness was greater for textured versus smooth devices, and differed across styles. Gel cohesivity, resistance to gel deformation, and energy absorption are directly related to form stability, which in turn determines shape retention. These characteristics provide information to aid surgeons choosing an implant based on surgical application, patient tissue characteristics, and desired outcome.

  14. ENERGIA EÓLICA: uma fonte energética limpa e renovável em nosso meio

    Directory of Open Access Journals (Sweden)

    GABRIEL MOREIRA

    2011-07-01

    Full Text Available Segundo o IBGE, no ano de 2010, a população brasileira teve um crescimento de 1,12%. Tendo em vista que tal crescimento necessita de uma grande demanda energética, precisa-se de fontes alternativas. Um bom meio supressor é a energia eólica. Meio de energia renovável e limpa. Segundo o documentário, Energia Eólica: a caçada pelos ventos, exibido pela TV Zabelê: “É uma dádiva da natureza o fato da nossa região ter esse grande potencial eólico [...].” No entanto, sua instalação necessita-se de grandes investimentos. Tendo em vista este grande crescimento populacional o projeto de pesquisa Energia Eólica: Uma fonte energética limpa e renovável em nosso meio, tem como objetivo a produção de um pequeno campo de energia eólica, em uma biblioteca na escola Oswaldo Cruz, na cidade de Sinop, Mato Grosso. Desta forma temos a possibilidade de reduzir 70% do consumo energético convencional, proporcionando uma economia financeira considerável. A implantação deste projeto está prevista para o segundo semestre de 2014.

  15. Cumulative irritation potential among metronidazole gel 1%, metronidazole gel 0.75%, and azelaic acid gel 15%.

    Science.gov (United States)

    Colón, Luz E; Johnson, Lori A; Gottschalk, Ronald W

    2007-04-01

    Topical therapy for rosacea aims to reduce inflammatory lesions and decrease erythema but can carry side effects such as stinging, pruritus, and burning. Metronidazole and azelaic acid gel 15% are U.S. Food and Drug Administration-approved for the treatment of rosacea. The current study was conducted to assess the cumulative irritation potential of 2 formulations of metronidazole 0.75% gel and 1% gel--and azelaic acid gel 15% over 21 days (N=36). Results of this study demonstrated a significantly greater poten tial for irritation from azelaic acid compared with metronidazole gel 0.75% (P < .0001), which had significantly greater potential for irritation compared with metronidazole gel 1% (P = .0054). Metronidazole gel 1% had a similar profile to white petrolatum.

  16. GEL DE ALOE-VERA COMO POTENCIAL INHIBIDOR DE LA CORROSIÓN DEL ACERO DE REFUERZO ESTRUCTURAL

    OpenAIRE

    Héctor Herrera-Hernández

    2015-01-01

    En el presente trabajo se estudiaelectroquímicamente un GELextracto de las hojas de ALOE VERAcomo un posible inhibidor de la corrosión del acero de refuerzo estructuraldel concreto.Los estudiosde corrosiónse llevaron a cabo en 1M de HCl y utilizando la técnica de espectroscopia de impedancia electroquímica (EIS)se evaluó la resistencia a la corrosión en presencia y ausencia del GEL.Los diagramas de impedancia mostraronque la adición en diferentes proporciones...

  17. Nanocrystal/sol-gel nanocomposites

    Science.gov (United States)

    Klimov, Victor L.; Petruska, Melissa A.

    2010-05-25

    The present invention is directed to a process for preparing a solid composite having colloidal nanocrystals dispersed within a sol-gel matrix, the process including admixing colloidal nanocrystals with an amphiphilic polymer including hydrophilic groups selected from the group consisting of --COOH, --OH, --SO.sub.3H, --NH.sub.2, and --PO.sub.3H.sub.2 within a solvent to form an alcohol-soluble colloidal nanocrystal-polymer complex, admixing the alcohol-soluble colloidal nanocrystal-polymer complex and a sol-gel precursor material, and, forming the solid composite from the admixture. The present invention is also directed to the resultant solid composites and to the alcohol-soluble colloidal nanocrystal-polymer complexes.

  18. Aproveitamento de nutrientes e de energia da ração de codornas japonesas em postura com o uso de fitase Nutrient and energy utilization from the feedings of laying Japanese quails by using phytase

    Directory of Open Access Journals (Sweden)

    Heder José D'Avila Lima

    2010-07-01

    Full Text Available O experimento foi realizado para avaliar o efeito da adição de fitase no aproveitamento dos ingredientes da ração para codornas. Foram utilizadas 200 codornas japonesas fêmeas com 251 dias de idade, peso médio de 187,2 ± 6,0 g e taxa de produção de ovos de 84,8%, distribuídas em delineamento inteiramente casualizado com quatro dietas experimentais e cinco repetições de dez aves por unidade experimental. As dietas experimentais consistiram de uma ração basal à base de milho e farelo de soja, formulada para atender às exigências nutricionais das codornas e às recomendações da matriz da fitase, suplementada com 0, 200, 400 ou 600 unidades de fitase (uf/kg. Utilizando-se o método de coleta total de excretas, foram determinados os valores de matéria seca ingerida, matéria seca excretada, energia metabolizável aparente (EMA, energia metabolizável aparente corrigida pela retenção de nitrogênio (EMAn e os coeficientes de metabolizabilidade da energia corrigida ou não pelo balanço de nitrogênio. Foi calculada também a quantidade de fósforo, cálcio e nitrogênio retido por ave/dia. De maneira geral, houve melhora no aproveitamento da energia das rações com a suplementação de fitase. Os níveis de 195 e 186 uf/kg resultaram em maior aproveitamento da EMA e EMAn. Não houve diferença na retenção de fósforo e cálcio. O nível de 600 (uf/kg promove menor excreção de nitrogênio, porém o de 368 uF/kg é suficiente para máxima retenção de nitrogênio pelas codornas.This experiment was conducted to evaluate the effect of phytase addition on the use of feeding ingredients for laying quails. It was used 200 female Japanese quails at 251 days of age at an average weight of 187.2 ± 6.0 g and egg production rate of 84.8%. The quails were distributed in a complete random design with four experimental diets and five repetitions of ten birds per experimental unity. The experimental diets were consisted of corn and

  19. Microphase separation in nanocomposite gels

    Science.gov (United States)

    Osaka, Noboru; Endo, Hitoshi; Nishida, Toshihiko; Suzuki, Takuya; Li, Huan-Jun; Haraguchi, Kazutoshi; Shibayama, Mitsuhiro

    2009-06-01

    Microphase separation in poly( N -isopropylacrylamide)(PNIPA)-clay nanocomposite hydrogels (NC gels) is investigated by means of contrast-variation small-angle neutron scattering (CV-SANS) and dynamic light scattering (DLS). By using CV-SANS, it is revealed that microphase separation occurs in NC gels above the lower-critical solution temperature (LCST) of PNIPA aqueous solutions. The observed partial scattering functions show that only the spatial distribution of PNIPA chains is highly distorted by microphase separation and PNIPA chains are preferentially adsorbed on the clay surfaces, where the PNIPA-rich phase forms nanoscaled bicontinuous structure mediated by the clay particles. Additional DLS measurements for dilute solutions with PNIPA and/or the clay nanoparticles confirm that aggregation of PNIPA above the LCST is dramatically suppressed by addition of clay particles. Based on these observations, we conclude that strong affinity between the polymer and clay has a significant effect on the phase separation in NC gels and allows one to tune the length scale of the phase separation phenomenon by clay concentration.

  20. Energy balance of the metropolitan zone of the valley of Mexico, methodology and the entailment energy-air quality; Balance de energia de la zona metropolitana del valle de Mexico metodologia y la vinculacion energia - calidad del aire

    Energy Technology Data Exchange (ETDEWEB)

    Bazan Navarrete, Gerardo [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2001-07-01

    The present document raises a methodology for the elaboration of the Energy Balance of the Metropolitan Zone of the Valley of Mexico (ZMVM), in order to unify criteria and to facilitate the work of entities and investigators, mainly of those that require the entailment of energy and environment. The applied methodology, the consolidated format and the caloric unity facilitates the insertion of the Energy Balance of the ZMVM within the National Balance of Energy. The regional balances of energy have the intention of knowing the energy consumption patterns in the ZMVM and the indexes of energy intensity by sector. They establish the relationship of the indexes of energy intensity with the local and global air quality of the region, performing studies of incidence with the main polluting agents and with the greenhouse effect gases. [Spanish] El presente documento plantea una metodologia para la elaboracion del Balance de Energia de la Zona Metropolitana del Valle de Mexico (ZMVM), con el proposito de unificar criterios y facilitar el trabajo de organismos e investigadores, sobre todo de aquellos que requieren vincular energia y medio ambiente. La metodologia aplicad, el formato consolidado y la unidad calorica facilitan la insercion del Balance de Energia de la ZMVM dentro del Balance Nacional de Energia. Los balances regionales de energia tienen el proposito de conocer los patrones de consumo de energia en la ZMVM y los indices de intensidad energetica por sector. Establecen la relacion de los indices de intensidad energetica con la calidad del aire local y global de la region, realizando estudios de incidencia con los principales contaminantes y con los gases de efecto invernadero.

  1. Proceedings of the 24. National seminar on the rational use of energy and exposition of equipment and services and 7. Binational seminar on energy saving [Selected Papers]; 24. Seminario nacional sobre el uso racional de energia y exposicion de equipos y servicios y 7. Seminario binacional de ahorro de energia. Memoria Tecnica. [Ponencias seleccionadas

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    This document contains the technical briefings of the 24. National Seminar on the rational use of energy, and exhibition of the equipment and services and the 7. Binational seminar on energy saving, organized by the Asociacion de Profesionistas y Tecnicos en Aplicacion Energetica (ATPAE), in Ciudad Juarez, Chihuahua, Mexico, from November 9 to 11, 2005. This seminar dealt with subjects such as: electrical energy saving, energy distribution, solar energy, energy saving in compressed air, biomass, administration and control of the demand of the electrical energy, bioclimatic architecture, use of the compressed natural gas, renewable energy, co-generation, qualification and consultancy for the intelligent use of the energy in PyMES. [Spanish] Este documento contiene la memoria tecnica del 24 Seminario Nacional sobre el uso racional de energia, y exposicion de los equipos y servicios y el 7 Seminario binacional de ahorro de energia, organizado por la Asociacion de Tecnicos y Profesionistas en Aplicacion Energetica (ATPAE), en Ciudad Juarez, Chihuahua, Mexico, del 9 al 11 de noviembre del 2005. Este seminario trato temas tales como: ahorro de energia electrica, distribucion de la energia, energia solar, ahorro de energia en aire comprimido, biomasa, administracion y control de la demanda de la energia electrica, arquitectura bioclimatica, uso del gas natural comprimido, energia renovable, cogeneracion, capacitacion y consultoria para el uso inteligente de la energia en las Pymes.

  2. Water equivalence of polymer gel dosimeters

    International Nuclear Information System (INIS)

    Sellakumar, P.; James Jebaseelan Samuel, E.; Supe, Sanjay S.

    2007-01-01

    To evaluate the water equivalence and radiation transport properties of polymer gel dosimeters over the wide range of photon and electron energies 14 different types of polymer gels were considered. Their water equivalence was evaluated in terms of effective atomic number (Z eff ), electron density (ρ e ), photon mass attenuation coefficient (μ/ρ), photon mass energy absorption coefficient (μ en /ρ) and total stopping power (S/ρ) tot of electrons using the XCOM and the ESTAR database. The study showed that the effective atomic number of polymer gels were very close ( en /ρ for all polymer gels were in close agreement ( tot of electrons in polymer gel dosimeters were within 1% agreement with that of water. From the study we conclude that at lower energy (<80keV) the polymer gel dosimeters cannot be considered water equivalent and study has to be carried out before using the polymer gel for clinical application

  3. Electric energy saving in the cellulose and paper industry; Ahorro de energia electrica en la industria de celulosa y papel

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1992-12-31

    This paper delineates the results of the demonstration project for electric energy saving, which is one of the twenty four projects in which the Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE) sponsors the diagnosis as well as the applied measures and the measures currently in application. Also the potential opportunity areas and the measures applied and in course of application, as well as the required investments and their recuperation periods. [Espanol] En este trabajo se describen los resultados del proyecto de demostracion de ahorro de energia electrica que es uno de los veinticuatro proyectos, en los que el Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE) financia tanto el diagnostico como la aplicacion de medidas. Se presentan tanto las areas de oportunidad, potenciales y medidas aplicadas y en aplicacion, asi como las inversiones requeridas y los periodos de recuperacion de las mismas.

  4. Uma definição natural de energia cinética e potencial em termodinâmica

    OpenAIRE

    Ferreira,G.F. Leal

    2007-01-01

    Na tentativa de tornar a termodinâmica mais familiar e sem violação do seu formalismo, define-se a partir de expressão do diferencial da energia, já incorporando as conseqüências da 2 Lei, o diferencial da energia cinética como associado às variações de temperatura a volume constante e o de energia potencial às de volume, à temperatura constante. A comparação entre os diferenciais é realizada pela normalização das variações de temperatura e de volume às de pressão. Ver-se-á que na fase gasosa...

  5. RedeGasEnergia and associated technologies with industrial market; A RedeGasEnergia e as tecnologias associadas a aplicacoes industriais

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Antonio Luiz F. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Gas Natural; Lodi, Cristiane [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Rede Gas Energia

    2004-07-01

    The industrial segment shows a potential of consumption of about 40 millions m{sup 3}/d. This represent a great opportunity for RedeGasEnergia, a net of excellent with realize a cooperative and segmented work with Technology for development of natural gas once that at this moment this segment consume almost 20 millions m{sup 3}/d. The search for solutions economically and sustainable for replacing others energetics sources that are currently being used, placing emphasis on the quality of product, a concern with the environment, the need for technological development, the ease handling of equipment, safety regulations, those are the aims of the Industrial Applications of Technology. The development of projects in the technology field associate to combustion/conversion of industrial installations, acclimatization/refrigeration, industrial equipment, and new products and processes, which will make use of the natural gas has being our main goal nowadays. (author)

  6. Application of scale test modules for model the electrothermal performance in buildings for the efficient use of energy; Aplicacion de modulos de prueba a escala para modelar el funcionamiento electrotermico de edificios para el uso eficiente de la energia

    Energy Technology Data Exchange (ETDEWEB)

    Acoltzi Acoltzi, Higinio

    2000-10-01

    and small vault pottery with glass sun reflector (34% in the experimental model and 37% in the theoretical model). [Spanish] La investigacion para acondicionamiento de espacios por enfriamiento en edificios de tamano real tiene un costo elevado por la cantidad de materiales y la variedad de parametros que intervienen. Por lo anterior, en este trabajo se utilizan modulos de prueba a escala acoplados a sistemas de aire acondicionado para obtener su respuesta electrotermica; es decir, cuantificar la cantidad de energia electrica que consumira un modulo en funcion de los materiales de prueba. Se analiza un modelo termico teorico transitorio y las pruebas experimentales del comportamiento termico de modulos de prueba a escala por la variacion de los materiales de los techos y ventanas, desarrollado con el objeto de establecer criterios de aplicacion de dichos materiales en las industrias de la edificacion. Adicionalmente se presenta el desarrollo de un modelo electrotermico teorico en estado permanente, que define el comportamiento del consumo de energia electrica, para mantener las condiciones de confort al interior de los modulos de prueba respecto a la variacion de los materiales mencionados. Se presenta tambien el diseno y el desarrollo de las pruebas experimentales utilizando los modulos de prueba a escala para validar el modelo electrotermico. La experimentacion se desarrolla exponiendo los modulos de prueba a escala, acoplados a los equipos de aire acondicionado, a la radiacion solar directa, registrando el consumo de energia electrica de los equipos de aire acondicionado, la radiacion solar sobre techo y ventanas de prueba, la temperatura interior de los modulos, la temperatura interior y exterior en la superficie de los techos de prueba, la temperatura ambiente, y la velocidad del viento. Los resultados obtenidos comparando las mediciones en campo y el modelo electrotermico teorico desarrollado, presentan diferencias promedio de 16%. Los ahorros de energia

  7. Aspects of dosimetry using radiation sensitive gels

    International Nuclear Information System (INIS)

    Baldock, Clive

    2001-01-01

    The use of radiation sensitive gels for dosimetry measurements was first suggested in the 1950s. It was subsequently shown that radiation induced changes in nuclear magnetic resonance (NMR) relaxation properties of gels infused with conventional Fricke dosimetry solutions could be measured. However, due to predominantly diffusion-related limitations, alternative polymer gel dosimeters were suggested. Clinical applications of these radiologically tissue equivalent gel dosimeters using magnetic resonance imaging (MRI) have subsequently been reported in the literature. In Fricke gels, Fe 2+ ions in ferrous sulphate solutions are usually dispersed throughout a gelatin or agarose hydrogel matrix. Radiation-induced changes in the dosimeters are considered to be either through direct absorption of ionising radiation or via intermediate water free radicals. Fe 2+ ions are converted to Fe 3+ ions with a corresponding change in paramagnetic properties that may be quantified using NMR relaxation measurements. In polymer gels, monomers are also dispersed in a gelatin or agarose hydrogel matrix. Monomers undergo a polymerisation reaction as a function of absorbed dose resulting in a three-dimensional polymer gel matrix. The radiation-induced formation of polymer influences NMR relaxation properties. The growth in polymer also results in other physical changes that may be used to quantify absorbed radiation dose. This thesis investigates various aspects of radiation dosimetry using radiation sensitive gels. Image processing software was developed to calculate NMR relaxation images of dosimetry gels. Measurements were undertaken to investigate the diffusion problem in Fricke gels. Radiological properties were theoretically modelled for both Fricke and polymer gels. A methodology was developed for the preparation of polymer gels. Vibrational spectroscopic studies were undertaken to investigate the underlying mechanism involved in the radiation-induced formation of polymer. MRI

  8. GERAÇÃO DE ENERGIA ELÉTRICA A PARTIR DO BIOGÁS / ELECTRICITY GENERATION FROM BIOGAS

    Directory of Open Access Journals (Sweden)

    DAIANA G. MARTINEZ

    2013-11-01

    Full Text Available O presente trabalho teve como objetivo avaliar o sistema de geração de energia elétrica, através do uso do biogás proveniente de uma unidade produtora de suínos, localizada no município de São Miguel do Iguaçu, levando em consideração os aspectos relacionados ao consumo de biogás e geração de eletricidade. Foi utilizado um medidor de fluxo visando à contabilização da vazão de Biogás, utilizou-se GCP-22 que é o equipamento de controle e proteção do gerador, à aquisição de dados também foi realizada através de analisadores de energia. Estes analisadores registram a produção/consumo de energia em um intervalo de tempo de 15 minutos. Observou-se que o mês de maio teve o maior consumo, chegando a aproximadamente 18 mil m³ de biogás. Avaliando o período, a energia total gerada do conjunto moto gerador obteve um valor aproximado 110,3 MWh. O consumo de energia da propriedade foi de 55 MWh, sendo 16,8 MWh consumido da rede de distribuição. A energia excedente exportado para a rede de distribuição foi de aproximadamente 72 MWh. A geração média no período foi de 605,93 kWh. A média do consumo de biogás pelo conjunto moto gerador foi de 49,3 Nm³.h.

  9. CONSUMO DE ENERGIA ELÉTRICA: UMA ANÁLISE DE FONTE ALTERNATIVA DE COLETOR SOLAR DE BAIXO CUSTO

    Directory of Open Access Journals (Sweden)

    Ramon Alves de Oliveira

    2015-08-01

    Full Text Available Com o aumento do consumo de energia elétrica e tarifas, a procura por geração de energias alternativas vem crescendo gradativamente, principalmente que sejam de baixo custo, assim possibilitando uma maior inclusão social beneficiando também as residências de baixa renda. Com o espírito de inovação a pesquisa buscou ideias simples que possam contribuir para a sociedade buscando alternativas sustentáveis e de baixo custo para a economia de energia elétrica Esse artigo teve como objetivo desenvolver um Coletor Solar de baixo custo. A metodologia utilizada foi quantitativa descritiva de caráter exploratório. Os procedimentos adotados foram uma pesquisa bibliográfica e desenvolvimento de um protótipo como procedimento experimental para coleta de dados. Dados os resultados nota-se que os testes realizados com o coletor solar de baixo custo, obteve um resultado com a temperatura da água para o banho de 37,1°C superior ao do chuveiro elétrico de 35,5°C. Com esse resultado o coletor solar se mostra, eficiente no quesito temperatura de banho e uma alternativa eficiente para a geração de energia térmica para aquecimento da água, além de reduzir a energia elétrica consumida em uma residência ao substituir o chuveiro tradicional que tem mais de 5000W , que é considerado um vilão para o consumo de energia elétrica.

  10. Energia e meio ambiente no Brasil Energy and environment in Brazil

    Directory of Open Access Journals (Sweden)

    José Goldemberg

    2007-04-01

    Full Text Available A produção e o consumo de energia são ambientalmente impactantes, mas os padrões atuais de consumo podem ser melhorados, estimulando o uso mais eficiente de energia e transição de fontes de energia fósseis para fontes renováveis. Graças à hidreletricidade, ao etanol e aos ainda baixos índices relativos de consumo energético, o Brasil tem uma posição confortável em comparação com o resto do mundo. Auto-suficiente em petróleo, o país discute hoje como garantir o suprimento de gás e eletricidade nos médio e longo prazos, com diferentes posicionamentos sobre os rumos a seguir. O presente artigo faz recomendações, com enfoque especial no setor elétrico nacional.Energy production and use present environmental impacts, but the present consumption patterns can be improved through a more efficient use of energy and a shift from fossil fuels to renewable sources of energy. Due to hydroelectricity and bioethanol, Brazil still has a comfortable position compared to the rest of the world. Self-sufficient in oil, the country today discusses how to supply natural gas and electricity in the medium and long terms, with different positions about the path to follow. The present article proposes recommendations, with special focus on the electricity sector.

  11. The privatised energy as an imperialist picklock; La energia privatizada como ganzua imperialista

    Energy Technology Data Exchange (ETDEWEB)

    Krieger Vazquez, Emilio [Asociacion Nacional de Abogados Democraticos (ANAD), Mexico, D. F. (Mexico)

    1997-12-31

    In this document an analysis is made of the energy privatization in Mexico, in which the obstacles that the Mexico`s Energy Sectors have gone through are mentioned, beginning with the 1910 revolutionary movement in Mexico, where the nationalization of energy sources sprang up, until the arrival of the Salinas-Zedillo phase. This in order to see if it is feasible or not the energy privatization, since as it must be remembered the various decades of the 19 and part of the 20 century in which an ideological debate and an economic battle was held among those who thought that the energy regime incorporated into the system of private property and those who thought that the economic and strategic importance of the hydrocarbons and the electricity justified a special regime [Espanol] En este documento se realiza un analisis de la privatizacion de la energia en Mexico, en el cual se mencionan los obstaculos que el Sector Energetico de Mexico ha tenido que pasar, iniciando por el movimiento revolucionario de 1910 en Mexico, de donde surgio la nacionalizacion de las fuentes de energia, hasta llegar a la fase Salino-Zedillo. Esto con el fin de ver si es factible o no la privatizacion de la energia, ya que como se debe de recordar las varias decadas del siglo 19y parte del siglo 20en las cuales se mantuvo el debate ideologico y la batalla economica, entre quienes pensaban en un regimen energetico incorporado al sistema de propiedad privada y quienes pensaban que la importancia economica y estrategica de los hidrocarburos y de la electricidad justificaban un regimen especial

  12. Competitive policies in the Nordic energy research and innovation area - eNERGIA : Part 3: Special reports

    Energy Technology Data Exchange (ETDEWEB)

    Klitkou, Antje; Pedersen, Trond Einar; Scordato, Lisa; Mariussen, Aage

    2008-07-01

    This report (Part 3: Special reports) is the third in a series of four reporting the results of the eNERGIA project. The first report presents the eight countries examined in the project - Denmark, Finland, Iceland, Norway, Sweden, Estonia, Latvia and Lithuania. The second report deals mainly with selected renewable energy technologies, which are discussed from different perspectives. The fourth report provides a summary of the whole project. The present report summarises the SWOT analyses of the Nordic countries and the eNERGIA workshops, and presents case studies of good practice. (Author) refs., 1 fig., 10 tabs

  13. Velocidade e energia cinética da chuva de um emissor usado em pivô central

    OpenAIRE

    Ferreira, Denise de Jesus Lemos

    2014-01-01

    A erosão decorrente do escoamento superficial causa grande impacto no potencial produtivo das áreas cultivadas. Portanto, o estudo da velocidade e da energia cinética com que as gotas de água atingem a superfície do solo irrigado é de fundamental importância para o desenvolvimento de diagnósticos e medidas que visem minimizar os efeitos negativos no manejo das áreas irrigadas. Nesse sentido, o objetivo do trabalho foi avaliar a velocidade de impacto e a energia cinética de chuvas artificiais ...

  14. Handbook of the energy sector 1992-1997; 1. ed.; Prontuario del sector de energia 1992-1997

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Fuentes, Adrian; Ylizaliturri Ridriguez, Jose Carlos; Aguilar Alejandre, Vicente; Gomez Chiu, Rebeca [Secretaria de Energia, Mexico, D. F. (Mexico)

    1998-12-31

    The planning of the energy sector requires a detailed knowledge of the relations that exist among the International markets of energy and the position of Mexico with respect to these. The Handbook of the energy sector 1992-1997 analyzes the tendency of the International markets of energy and the relative importance of the countries in relationship to its resources, production volumes, energy demand, fuel prices and foreign trade. It allows to know how and to what extent the energy sector has responded to the new economic conditions of the country and to the global tendencies, presenting statistics of easy consultation, updated information at International level on the reserves, installed capacity, production, consumption, prices and commerce of the main energy sources, and of the position of Mexico within this context. The information consists of seven chapters: First, analyzes the world-wide balance of energy, detailing the consumption of primary energy by region and source; in the second, the main crude petroleum statistics are analyzed, of selected countries; the third analyzes the refined products of petroleum, the fourth analyzes the world-wide natural gas reserves; the fifth the world-wide coal reserves and the sixth, the installed capacity of electricity generation in several countries. [Espanol] La planeacion del sector de energia requiere un conocimiento detallado de las relaciones que existen entre los mercados internacionales de energia y la posicion de Mexico con respecto a estos. El Prontuario del sector de energia 1992-1997 analiza la tendencia de los mercados internacionales de energia y la importancia relativa de los paises en relacion con sus recursos, volumenes de produccion, demanda de energia, precios de combustibles y comercio exterior. Permite conocer como y en que medida el sector de energia ha respondido a las nuevas condiciones economicas del pais y a las tendencias globales, al presentar estadisticas de facil consulta, de informacion

  15. The scenario of power generation in Brazil; O cenario da geracao de energia no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Dupim, Ivaldete da Silva [Universidade Federal do ABC, Santo Andre, SP (Brazil); Abreu Junior, Otavio Castor de; Moreira, Joao Manoel Losada; Carajilescov, Pedro; Leite, Patricia Teixeira; Cicogna, Marcelo A.

    2008-07-01

    The values concerning to the production of national power today, the evolution of composition and the installed capacity of electric matrix between the years 1980-2005, the outlook for demand and supply of energy according to the 'Plano Decenal de Energia' (2006-2015) were used as information basis for this study and analysis of some peculiar characteristics of the management of the energy sector in Brazil. The main objective was to highlight the importance of hydroelectric generation in Brazil. Finally we tried to make the comparison of the costs of hydroelectric generation in relation to other alternative sources available in the country.

  16. Crise financeira, energia e sustentabilidade no Brasil Financial crisis, energy and sustainability in Brazil

    Directory of Open Access Journals (Sweden)

    Oswaldo Lucon

    2009-01-01

    Full Text Available A recente crise financeira global traz consigo efeitos como a redução da atividade econômica e, consequentemente, do consumo de energia. Essa pode ser uma importante oportunidade para reorganizar o sistema energético em bases mais sólidas e sustentáveis: a eficiência, a maior participação das fontes renováveis e a descentralização da produção de energia. O Brasil e outros países em desenvolvimento podem aproveitar a experiência dos países desenvolvidos em eficiência energética, complementando com um programa vigoroso em energias renováveis, particularmente as "modernas" (eólica, solar, biomassa e pequenas hidrelétricas. Entretanto, preocupa o cenário inercial nacional, baseado num aumento da participação das fontes fósseis de energia na matriz, na priorização dos recursos à exploração de petróleo e gás natural e na manutenção de padrões insustentáveis de produção e consumo.The recent global financial crisis brings about effects such as a reduction in the economic activity and consequently in energy consumption. This may be an important opportunity to reorganize the energy system under more solid and sustainable foundations: efficiency, higher share of renewables and decentralized energy production. Brazil and other developing countries can leapfrog the experience acquired by developed nations in energy efficiency, complementing with a vigorous program in renewables, particularly the "modern" (wind, solar, biomass and small hydros. However, there is a concern about the inertial Brazilian scenario, based on an increasing share of fossil fuels in the matrix, in prioritizing resources to oil and gas exploration and in the continuing unsustainable patterns of production and consumption.

  17. PROSPECÇÃO EM SIMULADOR DE ENERGIA ELÉTRICA

    OpenAIRE

    Ribeiro, Elisalvo Alves; Universidade Federal de Sergipe; Nunes, Maria Augusta Silveira Netto; Universidade Federal de Sergipe

    2014-01-01

    O processo de educar a população, em relação ao hábito de consumo consciente, é uma árdua tarefa, visto que as pessoas vivem em torno de aparatos tecnológicos que evoluem com uma velocidade nunca antes vivida pela humanidade, os quais oferecem mais comodidade, porém, em contrapartida incita-se a consumir mais energia. Assim, um dos meios de auxiliar as pessoas a terem um consumo consciente, é possibilitando-lhes mensurar seus consumos diários, através de um simulador de consumo, onde este pos...

  18. Prospettive di mercato dell'energia nucleare in Gran Bretagna e negli Stati Uniti.

    Directory of Open Access Journals (Sweden)

    A. CASSUTO

    2014-07-01

    Full Text Available L’articolo analizza i programmi atomici inglese e statunitense a scopi civili, sostenendo che essi non possono che avere un effetto dimostrativo e non permettono alcune remunerazione immediata. Ma sono già chiare le indicazioni che tale opera pionieristica è destinata ad aprire vasti mercati nelle zone sottosviluppate del mondo intero e negli usi più diversi dell’energia nell’industria, in agricoltura, nei trasporti ed in numerosi aspetti del benessere pubblico e del progresso sociale. 

  19. A autosustentabilidade em energia eléctrica da região do Algarve

    OpenAIRE

    Bastos, Carlos Alberto da Paixão

    2008-01-01

    Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em BioEnergia A evolução humana foi ao longo da história, acompanhada pela constante inovação tecnológica desenvolvida pelo homem, a qual se caracterizou por uma melhoria significativa no seu nível de vida. Actualmente os desafios que se deparam com o bem-estar das populações e o desenvolvimento tecnológico associado a uma cidadania mundial, desequilibrada mas em ...

  20. Evolution of energy conversion plants; Evoluzione delle macchine per la conversione dell'energia

    Energy Technology Data Exchange (ETDEWEB)

    Osnaghi, C. [Milan Politecnico, Milan (Italy). Dipt. di Energetica

    2001-06-01

    The paper concerns the evolution and the future development of energy conversion plants and puts into evidence the great importance of the scientific and technological improvement in machines design, in order to optimize the use of energy resources and to improve ambient compatibility. [Italian] L'articolo descrive l'evoluzione recente e lo sviluppo futuro degli impianti di conversione dell'energia, evidenziando la grande importanza del progresso scientifico e tecnologico nella progettazione delle macchine, al fine di ottimizzare l'uso delle risorse energetiche e migliorare la compatibilita' ambientale.

  1. Fluxos de energia e desenvolvimento da cultura do abacaxizeiro Energy fluxes and development of pineapple crop

    Directory of Open Access Journals (Sweden)

    Cleber B. de Souza

    2008-08-01

    Full Text Available O dossel vegetativo do abacaxizeiro varia consideravelmente desde o plantio das mudas até a cobertura completa, no final do ciclo produtivo. Um experimento agrometeorológico foi desenvolvido nos tabuleiros costeiros do estado da Paraíba, com o cultivo do abacaxi, cv. Pérola, de março de 2001 a julho de 2002, com o objetivo de analisar os efeitos dos componentes do balanço de energia sobre os diversos estágios de desenvolvimento do abacaxizeiro cultivado em condições de irrigação suplementar. O método do balanço de energia, baseado na razão de Bowen, foi utilizado na obtenção dos fluxos de energia durante o período experimental. Os componentes do balanço de energia foram fortemente influenciados pelo índice de área foliar e altura de planta durante todas as fases de desenvolvimento da cultura, principalmente o fluxo de calor sensível. Os resultados também indicaram que o peso da matéria seca é totalmente independente da partição do saldo de radiação em fluxo de calor latente, fluxo de calor sensível e fluxo de calor no solo. O fluxo de calor sensível variou em função do volume de água aplicado por irrigação, no cultivo de abacaxi.The canopy of the pineapple crop changes considerably during the growing season, from a leafless stage to a fully closed canopy at the end of the productive cycle. In order to evaluate the effects of the energy balance components on the developmental stage of the pineapple crop, a field experiment was carried out from March, 2001 to July, 2002 with pineapple crop, cv. Perola, cultivated under supplemental irrigation conditions in the State of Paraíba, Brazil. The method of energy balance based on the Bowen ratio was used to obtain energy balance components during the experimental period. The energy balance components were strongly affected by leaf area index and plant height during all developmental stages of the canopy, especially the sensible heat flux. Results showed that the dry

  2. O mercado brasileiro da energia eólica, impactos sociais e ambientais

    Directory of Open Access Journals (Sweden)

    Lucía Iracema Chipponelli Pinto

    2017-12-01

    Full Text Available Atualmente a energia eólica está mostrando destaque no cenário energético brasileiro por ser uma fonte energética renovável que apresenta elevada disponibilidade no território e cujo aproveitamento baixos níveis de emissão de gases de efeito estufa. Em razão desses aspectos, a energia eólica é uma promissora alternativa para ajudar a reverter o quadro atual de crise energética decorrente da escassez do recurso hídrico e o crescimento da emissão de gases de efeito estufa decorrente do crescimento da participação de combustíveis fósseis na matriz elétrica brasileira. Na perspectiva econômica, a geração eólica está apresentando custos competitivos com as fontes convencionais de energia. Entretanto, como qualquer outra atividade econômica, pode causar impactos sociais e ambientais que devem ser analisados e mitigados. Essas dimensões controversas da energia eólica tornam a questão da localização de parques eólicos um problema bastante complexo, dado a incompatibilidade entre esses impactos de caráter localizado e o grande benefício público associado à segurança energética do país. Este artigo apresenta uma revisão dos estudos e publicações sobre o aproveitamento eólico no Brasil com o intuito de promover uma discussão sobre aspectos relacionados aos impactos socioambientais. Em razão da curta história do aproveitamento eólico no Brasil, estudos para avaliação mais aprofundada dos impactos socioambientais devem ser realizados com apoio de recursos do próprio setor energético a fim de promover um crescimento sustentável da participação desta fonte energética na matriz elétrica nacional.

  3. Renewable energies in the national power supply; Energias renovables en la oferta energetica nacional

    Energy Technology Data Exchange (ETDEWEB)

    Huacuz Villamar, Jorge M [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    Mexico is a country endowed with abundant power resources. By the magnitude of its reserves and the installed production capacity. This article presents the different nonconventional energy resources which Mexico has, with the purpose of using them for the generation of electric energy. [Spanish] Mexico es un pais dotado de abundantes recursos energeticos. Por la magnitud de sus reservas y por la capacidad instalada de produccion. Este articulo presenta los diferentes recursos energeticos no convencionales con los que cuenta Mexico, con el fin de utilizarlos para la generacion de energia electrica.

  4. Fontes de energias alternativas e os desafios para a cadeia produtiva automotiva

    OpenAIRE

    Alves, Marcelo Ivanildo dos Santos

    2011-01-01

    Resumo: A indústria automotiva sempre esteve envolta num processo permanente de inovações e mais recentemente ela vem passando por várias e importantes mudanças. Essas mudanças decorrem de três fatores fundamentais: motivações ambientais, preço do petróleo e novos mercados. Num cenário de aperfeiçoamento dos padrões atuais de propulsão veicular, percebe-se o surgimento de fontes de energias alternativas. Onde o etanol surge como alternativa e poderá ser adotado em determinados mercados, como ...

  5. Rheological characterization of Poloxamer 407 nimesulide gels

    Directory of Open Access Journals (Sweden)

    M. N. Freitas

    2009-01-01

    Full Text Available The thermal gelling property of Poloxamer 407- nimesulide gels was characterized by rheological studies. Nimesulide, a local anti-inflammatory and anesthetic drug used for the treatment of acute and chronic pain, has a short duration of action and a long-acting single-dose injection would be of clinical importance. Thus a poloxamer 407 gel applied intramuscularly could prolong the release and action of nimesulide. In this study, aqueous gels with nimesulide, containing three different concentrations of Poloxamer 407, were prepared. Viscosity measurements were performed by rheologial studies to obtain the optimal sol-gel transition temperature . Poloxamer 407 gels are pseudoplastic and viscoelastic materials, which have an elastic modulus (G', characteristic of the solid, and a viscous modulus (G'', characteristic of the liquid material. Moreover, being pseudoplastic gels, when they are deformed by shearing, their viscosity decreases. Increase of the polymer concentration increased the viscosity of the gels, which could affect the releasing process of nimesulide. Furthermore, the presence of nimesulide led to a lowering of the sol-gel transition temperature. Keywords: Poloxamer 407 gels; nimesulide; rheological characterization; viscosity; sol-gel transition temperature.

  6. Desenvolvimento e caracterização de gel de biopolímero produzido pela fermentação de melaço da cana-de-açúcar pelo microorganismo Zoogloea sp. Contendo ácido úsnico

    OpenAIRE

    de Araújo Néris, Mozart

    2007-01-01

    Um polissacarídeo extracelular foi produzido por via microbiológica, através da bactéria Zoogloea sp. utilizando como matéria prima o melaço de cana-de-açúcar resultando em uma membrana fibrosa que foi utilizado para preparar um gel contendo ácido úsnico, que apresenta atividade antimicrobiana. Um método de extração de ácido úsnico do gel de biopolímero foi validado. O ácido úsnico foi caracterizado puro e incorporado em gel de biopolímero por Calorimetria Diferencial Explorató...

  7. Calcium Impact on Milk Gels Formation

    DEFF Research Database (Denmark)

    Koutina, Glykeria

    salts. The perturbation of calcium equilibria by these factors will affect the final properties of acid, calcium and rennet milk gels. By decreasing the pH from 6.0 to 5.2 (acid gels), the calcium equilibrium was significantly affected by temperature (4, 20, 30, 40 oC), and different combinations...... enriched dairy products. Calcium gels can be produced by addition of a calcium salt and heat treatment at temperatures higher than 70 oC for several minutes. The combination of heat treatment and calcium addition to milk with pH values between 6.6 and 5.6, will produce calcium milk gels with unique...... to be formed. In addition the low amount of micellar calcium caused a more compact gel structure with many protein aggregates. The results of this study highlighted the importance of calcium for the formation of acid, calcium and rennet gels. The content and the interactions of calcium with proteins during...

  8. Tunable Gas Sensing Gels by Cooperative Assembly.

    Science.gov (United States)

    Hussain, Abid; Semeano, Ana T S; Palma, Susana I C J; Pina, Ana S; Almeida, José; Medrado, Bárbara F; Pádua, Ana C C S; Carvalho, Ana L; Dionísio, Madalena; Li, Rosamaria W C; Gamboa, Hugo; Ulijn, Rein V; Gruber, Jonas; Roque, Ana C A

    2017-07-19

    The cooperative assembly of biopolymers and small molecules can yield functional materials with precisely tunable properties. Here, the fabrication, characterization, and use of multicomponent hybrid gels as selective gas sensors are reported. The gels are composed of liquid crystal droplets self-assembled in the presence of ionic liquids, which further coassemble with biopolymers to form stable matrices. Each individual component can be varied and acts cooperatively to tune gels' structure and function. The unique molecular environment in hybrid gels is explored for supramolecular recognition of volatile compounds. Gels with distinct compositions are used as optical and electrical gas sensors, yielding a combinatorial response conceptually mimicking olfactory biological systems, and tested to distinguish volatile organic compounds and to quantify ethanol in automotive fuel. The gel response is rapid, reversible, and reproducible. These robust, versatile, modular, pliant electro-optical soft materials possess new possibilities in sensing triggered by chemical and physical stimuli.

  9. Research on pre-staining gel electrophoresis

    International Nuclear Information System (INIS)

    Zhong Ruibo; Liu Yushuang; Zhang Ping; Liu Jingran; Zhao Guofen; Zhang Feng

    2014-01-01

    Background: Gel electrophoresis is a powerful biochemical separation technique. Most biological molecules are completely transparent in the visible region of light, so it is necessary to use staining to show the results after gel electrophoresis, and the general steps of conventional staining methods are time-consuming. Purpose: We try to develop a novel approach to simplify the gel electrophoresis: Pre-Staining Gel Electrophoresis (PSGE), which can make the gel electrophoresis results monitored in real time. Methods: Pre-stain the protein samples with Coomassie Brilliant Blue (CBB) for 30 min before loading the sample into the gel well. Results and Conclusion: PSGE can be successfully used to analyze the binding efficiency of Bovine Serum Albumin (BSA) and amphiphilic polymer via chemical coupling and physical absorption, and the double PSGE also shows a great potential in bio-analytical chemistry. (authors)

  10. Self-Pumping Active Gel

    Science.gov (United States)

    Wu, Kun-Ta; Hishamunda, Jean Bernard; Fraden, Seth; Dogic, Zvonimir

    Isotropic active gels are the network which is consist of cross-linked building blocks and the structure of which changes randomly and isotropically with time. Dogic et. al. show that pairs of anti-parallel microtubules form extensile bundles, which merge, extend, and buckle. In an unconfined system, the dynamics of these bundles causes spontaneous turbulent-like flow driven by motion of microscopic molecular motors. We found that confining these active gels in a millimeter sized toroids causes a transition into a new dynamical state characterized by circulation currents persisting for hours until ATP is depleted. We show how toroid dimensions impact the properties of self-organized circular currents, how directions of circulation can be designed by engineering ratchet-shaped boundaries, and how circulations of connected toroids can be either synchronized or antisynchronized. Furthermore, we demonstrate that the flow rate in the circulation is independent of curvature and length of flow path. The flow rate persists for centimeters without decay, disregarding conventional pipe flow resistance. Such findings pave the path to self-pumping pipe transport and performing physical work with biological system.

  11. Microfluidics of soft granular gels

    Science.gov (United States)

    Nixon, Ryan; Bhattacharjee, Tapomoy; Sawyer, W. Gregory; Angelini, Thomas E.

    Microfluidic methods for encapsulating cells and particles typically involve drop making with two immiscible fluids. The main materials constraint in this approach is surface tension, creating inherent instability between the two fluids. We can eliminate this instability by using miscible inner and outer phases. This is achieved by using granular micro gels which are chemically miscible but physically do not mix. These microgels are yield stress materials, so they flow as solid plugs far from shear gradients, and fluidize where gradients are generated - near an injection nozzle for example. We have found that tuning the yield stress of the material by varying polymer concentration, device performance can be controlled. The solid like behavior of the gel allows us to produces infinitely stable jets that maintain their integrity and configuration over long distances and times. These properties can be combined and manipulated to produce discrete particulate bunches of an inner phase, flowing inside of an outer phase, well enough even to print a Morse code message suspended within flow chambers about a millimeter in diameter moving at millimeters a second.

  12. Stabilized aqueous gels and uses thereof

    Energy Technology Data Exchange (ETDEWEB)

    Swanson, B.L.

    1978-08-29

    New improved aqueous gels, and methods of using same in contacting subterranean formations, are provided. The gels are prepared by gelling an aqueous brine having incorporated therein a water-soluble cellulose ether such as a carboxymethylcellulose (CMC), and are rendered more stable to decomposition by incorporating a sulfoalkylated tannin stabilizing agent, such as a sulfomethylated quebracho (SMQ), in the gel during the preparation thereof.

  13. Digestibilidade e energia metabolizável da glicerina em cães

    Directory of Open Access Journals (Sweden)

    Daniele Cristina de Lima

    2014-01-01

    Full Text Available A glicerina é um coproduto originado da produção de biodiesel, que apresenta possibilidade de uso como fonte energética na nutrição animal. Objetivou-se avaliar os coeficientes de digestibilidade aparente (CDA e a energia metabolizável (EM de dietas contendo glicerina, bem como a EM da glicerina em cães. Foram avaliadas quatro dietas contendo crescentes níveis de glicerina: 0%, 3%, 6% e 9%. As dietas foram fornecidas a oito cães adultos, os quais foram distribuídos em delineamento Quadrado Latino duplo (4x4. A adição de glicerina aumentou os CDA da matéria seca, energia bruta e a EM, sem afetar os CDA da proteína bruta e dos extrativos não nitrogenados da dieta. Entretanto, resultou em redução no CDA do extrato etéreo da dieta. Embora a adição de glicerina tenha reduzido o teor de matéria seca fecal, não houve efeito sobre o escore das fezes. Dentro dos níveis avaliados, a glicerina pode ser utilizada na dieta como fonte energética altamente disponível para cães.

  14. Potential of energy saving with photovoltaic systems; Potencialidad de ahorro de energia con sistemas fotovoltaicos

    Energy Technology Data Exchange (ETDEWEB)

    Guzman S, Eusebio; Bratu S, Neagu [Universidad Autonoma Metropolitana, Mexico, D. F. (Mexico)

    1998-12-31

    This paper presents an approach on the application of photovoltaic systems in energy saving. The problem of the electric energy demand in the coming years is analyzed and its consequences on the environment and on the energy reserves of conventional sources. A model of the electric circuit equivalent to a photovoltaic cell illustrates the behavior of the photovoltaic cell in function of the climatological conditions. The former in order to show some of the limiting factors in this type of generator. Also, the evolution of the applications of the photovoltaic systems and its forecasting in the installed capacity in the next 20 years, is described. [Espanol] En este trabajo se presenta un enfoque de la aplicacion de los sistemas fotovoltaicos en el ahorro de energia. Se plantea el problema del crecimiento de la demanda energetica en los proximos anos y sus consecuencias sobre el medio ambiente y las reservas de energia por fuentes convencionales. Un modelo del circuito electrico equivalente de una celda fotovoltaica ilustra el comportamiento del generador fotovoltaico en funcion de las condiciones climatologicas. Lo anterior con el fin de mostrar algunas limitantes de este tipo de generador. Tambien se describe la evolucion de las aplicaciones de los sistemas fotovoltaicos y el pronostico de la potencia instalada en los proximos 20 anos.

  15. Wind power prognosis statistical system; Sistema estadistico de pronostico de la energia eoloelectrica

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Garcia, Alfredo; De la Torre Vega, Eli [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2009-07-01

    The integration of the first Aeolian farm of large scale (La Venta II) to the National Interconnected System requires taking into account the random and discontinuous nature of the Aeolian energy. An important tool, for this task, is a system for the prognosis of the Aeolian energy in the short term. For this reason, the Instituto of Investigaciones Electricas (IIE) developed a statistical model to realize this prognosis. The prediction is done through an adaptable linear combination of alternative competing models, where the weights given to each model are based on its more recent prognosis quality. Also, the application results of the prognoses system are presented and analyzed. [Spanish] La integracion de la primera grana eolica de gran escala (La Venta II) al Sistema Interconectado Nacional requiere tomar en cuenta la naturaleza aleatoria y discontinua de la energia eolica. Una importante herramienta, para esta tarea, es un sistema para el pronostico de la energia eolica a corto plazo. Por ello, el Instituto de Investigaciones Electricas (IIE) desarrollo un modelo estadistico para realizar este pronostico. La prediccion es hecha a traves de una combinacion lineal adaptable de modelos competidores alternativos, donde los pesos dados a cada modelo estan basados en su mas reciente calidad de pronostico. Tambien se presentan y analizan los resultados de la aplicacion del sistema de pronosticos.

  16. Ionic liquid based multifunctional double network gel

    Science.gov (United States)

    Ahmed, Kumkum; Higashihara, Tomoya; Arafune, Hiroyuki; Kamijo, Toshio; Morinaga, Takashi; Sato, Takaya; Furukawa, Hidemitsu

    2015-04-01

    Gels are a promising class of soft and wet materials with diverse application in tissue engineering and bio-medical purpose. In order to accelerate the development of gels, it is required to synthesize multi-functional gels of high mechanical strength, ultra low surface friction and suitable elastic modulus with a variety of methods and new materials. Among many types of gel ionic gel made from ionic liquids (ILs) could be used for diverse applications in electrochemical devices and in the field of tribology. IL, a promising materials for lubrication, is a salt with a melting point lower than 100 °C. As a lubricant, ILs are characterized by an extremely low vapor pressure, high thermal stability and high ion conductivity. In this work a novel approach of making double network DN ionic gel using IL has been made utilizing photo polymerization process. A hydrophobic monomer Methyl methacrylate (MMA) has been used as a first network and a hydrophobic IL monomer, N,N-diethyl-N-(2-mthacryloylethyl)-N-methylammonium bistrifluoromethylsulfonyl)imide (DEMM-TFSI) has been used as a second network using photo initiator benzophenon and crosslinker triethylene glycol dimethacrylate (TEGDMA). The resulting DN ionic gel shows transparency, flexibility, high thermal stability, good mechanical toughness and low friction coefficient value which can be a potential candidate as a gel slider in different mechanical devices and can open a new area in the field of gel tribology.

  17. Gel catalysts that switch on and off

    Science.gov (United States)

    Wang, Guoqiang; Kuroda, Kenichi; Enoki, Takashi; Grosberg, Alexander; Masamune, Satoru; Oya, Taro; Takeoka, Yukikazu; Tanaka, Toyoichi

    2000-01-01

    We report development of a polymer gel with a catalytic activity that can be switched on and off when the solvent composition is changed. The gel consists of two species of monomers. The major component, N-isopropylacrylamide, makes the gel swell and shrink in response to a change in composition of ethanol/water mixtures. The minor component, vinylimidazole, which is capable of catalysis, is copolymerized into the gel network. The reaction rate for catalytic hydrolysis of p-nitrophenyl caprylate was small when the gel was swollen. In contrast, when the gel was shrunken, the reaction rate increased 5 times. The activity changes discontinuously as a function of solvent composition, thus the catalysis can be switched on and off by an infinitesimal change in solvent composition. The kinetics of catalysis by the gel in the shrunken state is well described by the Michaelis–Menten formula, indicating that the absorption of the substrate by the hydrophobic environment created by the N-isopropylacrylamide polymer in the shrunken gel is responsible for enhancement of catalytic activity. In the swollen state, the rate vs. active site concentration is linear, indicating that the substrate absorption is not a primary factor determining the kinetics. Catalytic activity of the gel is studied for substrates with various alkyl chain lengths; of those studied the switching effect is most pronounced for p-nitrophenyl caprylate. PMID:10954747

  18. Conducting polymer electrodes for gel electrophoresis.

    Directory of Open Access Journals (Sweden)

    Katarina Bengtsson

    Full Text Available In nearly all cases, electrophoresis in gels is driven via the electrolysis of water at the electrodes, where the process consumes water and produces electrochemical by-products. We have previously demonstrated that π-conjugated polymers such as poly(3,4-ethylenedioxythiophene (PEDOT can be placed between traditional metal electrodes and an electrolyte to mitigate electrolysis in liquid (capillary electroosmosis/electrophoresis systems. In this report, we extend our previous result to gel electrophoresis, and show that electrodes containing PEDOT can be used with a commercial polyacrylamide gel electrophoresis system with minimal impact to the resulting gel image or the ionic transport measured during a separation.

  19. Conducting polymer electrodes for gel electrophoresis.

    Science.gov (United States)

    Bengtsson, Katarina; Nilsson, Sara; Robinson, Nathaniel D

    2014-01-01

    In nearly all cases, electrophoresis in gels is driven via the electrolysis of water at the electrodes, where the process consumes water and produces electrochemical by-products. We have previously demonstrated that π-conjugated polymers such as poly(3,4-ethylenedioxythiophene) (PEDOT) can be placed between traditional metal electrodes and an electrolyte to mitigate electrolysis in liquid (capillary electroosmosis/electrophoresis) systems. In this report, we extend our previous result to gel electrophoresis, and show that electrodes containing PEDOT can be used with a commercial polyacrylamide gel electrophoresis system with minimal impact to the resulting gel image or the ionic transport measured during a separation.

  20. Constatação do “efeito sombra” e economia de recursos hídricos e de energia na irrigação do cafeeiro por meio de um pivô central convencional

    Directory of Open Access Journals (Sweden)

    Nara Cristina de Lima Silva

    2015-07-01

    Full Text Available O pivô central é um sistema de irrigação que possibilita a aplicação de água em toda a área plantada. A observação do funcionamento de um pivô central convencional em campo, ao irrigar uma lavoura de cafeeiros adultos, possibilitou identificar um acúmulo de água nas extremidades dos dosséis das plantas em detrimento da região central das entrelinhas. Este trabalho teve como objetivo comprovar a influência do cafeeiro na interceptação da lâmina de irrigação aplicada por meio de um pivô central convencional, o que foi denominado pelos autores de “efeito sombra”. Além disso, o trabalho buscou constatar a possibilidade de economia de recursos hídricos e de energia em função do “efeito sombra”. O experimento foi realizado em uma área de 115,33ha plantada com duas cultivares do cafeeiro arábica (Cofeea arabica onde foi coletada água aspergida pelo pivô central sob o dossel das plantas e nas entrelinhas. Os dados foram analisados estatisticamente por meio de análise descritiva e análise de variância, utilizando-se o software Action®. Os resultados mostraram que as lâminas médias coletadas sob os dosséis foram maiores do que as lâminas médias coletadas nas entrelinhas para ambas as cultivares, e a lâmina interceptada pelo cafeeiro foi, em média, 30,4% maior que a lâmina real aplicada pelo equipamento, comprovando-se o “efeito sombra” e, portanto, a possibilidade de economia de recursos hídricos e de energia.

  1. ANÁLISE EXPERIMENTAL DA INFLUÊNCIA DA TECNOLOGIA HOMEPLUG NA QUALIDADE DA ENERGIA ELÉTRICA

    Directory of Open Access Journals (Sweden)

    Antonio Luiz Pereira de Siqueira Campos

    2008-03-01

    Full Text Available Trabalhos recentes têm estudado características do meio elétrico para a transmissão de dados, ruídos e técnicas empregadas na comunicação pela rede elétrica. A maioria dos trabalhos limita-se a fazer testes de desempenho do protocolo. Diversos pesquisadores têm se preocupado com a influência das transmissões de dados na rede elétrica sobre as comunicações sem fio, mas ninguém tem se preocupado com a influência dessas transmissões na qualidade da energia elétrica. Este trabalho apresenta resultados preliminares sobre o efeito produzido por redes de computadores que utilizam a tecnologia Homeplug 1.0 na qualidade da energia elétrica. Para isso, foram escolhidos parâmetros apropriados para análise da qualidade da energia elétrica, bem como, foram definidas as formas de se obter esses parâmetros. Foi montada uma rede de computadores, com modem’s PLC, no CEFET-RN e realizados testes iniciais para medição da qualidade de energia elétrica. Resultados numéricos são apresentados.

  2. Eesti Energia lubab võlgades paberivabriku elektrita jätta / Eiris Teeveere, Päären Mardiste

    Index Scriptorium Estoniae

    Teeveere, Eiris

    2008-01-01

    Eesti Energia lülitab välja elektri Kehras asuvas Horizon Tselluloosi ja Paberivabrikus, kui võlgu tähtajaks ei maksta. Tehase sulgemine tooks kaasa 500 inimese töötuks jäämise ning reovee puhastuse lõppemise

  3. Management report 2007 CNEN - Brazilian Nuclear Energy Commission; Relatorio de gestao 2007 CNEN - Comissao Nacional de Energia Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    This document reports the general activity management of the Comissao Nacional de Energia Nuclear - CNEN - Brazil during the year of 2007, involving the CNEN role in the public policy execution, the Brazilian program of nuclear activities in the areas of nuclear safety, research and development, radiopharmaceutical production, teaching, administration in general and miscellaneous.

  4. Eesti Energia hakkab elektrit müüma otse börsi kaudu / Gert D. Hankewitz

    Index Scriptorium Estoniae

    Hankewitz, Gert D.

    2006-01-01

    Eesti Energia ostis 15,6 miljoni krooni eest elektrimaaklerfirma Solidus, mille kaudu hakkab Põhjamaadesse elektrit müüma. Diagramm. Vt. samas: Sirje Rank. Järsk hinnatõus Põhjala elektribörsil kütab kriitikat; Romet Kreek. Nord Poolil kaubeldakse elektri ja saastekvootidega; Mis on Estlink ehk Eesti-Soome merekaabel

  5. Interazione onda struttura in un dispositivo di conversione dell'energia da onda a tracimazione e probematiche progettuali

    DEFF Research Database (Denmark)

    Vicinanza, D.; Margheritini, Lucia; Zanuttigh, B.

    2010-01-01

    energia potenziale mediante realizzazione di un carico idraulico in serbatoi a diversi livelli. La configurazione analizzata consta di tre serbatoi ed è stata sottoposta a diverse campagne di prove sperimentali presso il laboratorio dell’Università di Aalborg (Danimarca). Gli esiti delle prove di laboratorio...

  6. Adoção da energia solar fotovoltaica em hospitais: revisando a literatura e algumas experiências internacionais

    Directory of Open Access Journals (Sweden)

    Juliane Barbosa dos Santos

    2013-09-01

    Full Text Available O Sol possui um papel de extrema importância para a existência dos seres humanos e o Brasil possui uma posição geográfica privilegiada para explorar a luz solar. A união desses dois fatores favorece o uso de células solares para conversão de energia solar em energia elétrica por meio da tecnologia fotovoltaica, tornando-se ótima alternativa de energia, principalmente por ser uma fonte limpa, gerando menores danos ao meio ambiente. Este trabalho tem por objetivo abordar a tecnologia fotovoltaica tendo como foco analítico os hospitais, por meio de casos de sucesso encontrados na literatura internacional. Os hospitais, mesmo executando serviços de total importância à sociedade, apresentam potencial poluidor capaz de causar danos à saúde das pessoas e ao meio ambiente que se localiza ao seu redor. Há estimativas de que as reservas brasileiras de petróleo sejam suficientes para 22 anos, tornando-se necessária a busca por novas fontes alternativas para a geração de energia.

  7. Management report 2005 CNEN - Brazilian Nuclear Energy Commission; Relatorio de gestao 2005 CNEN - Comissao Nacional de Energia Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2006-03-15

    This document reports the results of the activity management of the Comissao Nacional de Energia Nuclear - CNEN - Brazil during the year of 2005, involving the Brazilian program of nuclear activities in the areas of nuclear safety, research and development, radiopharmaceutical production, institutional management, teaching, administration in general and miscellaneous.

  8. Management report 2006 CNEN - Brazilian Nuclear Energy Commission; Relatorio de gestao 2006 CNEN - Comissao Nacional de Energia Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-03-15

    This document reports the results of the activity management of the Comissao Nacional de Energia Nuclear - CNEN - Brazil during the year of 2005, involving the Brazilian program of nuclear activities in the areas of nuclear safety, research and development, radiopharmaceutical production, institutional management, teaching, administration in general and miscellaneous.

  9. Management report 2004 CNEN - Brazilian Nuclear Energy Commission; Relatorio de gestao 2004 CNEN - Comissao Nacional de Energia Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-03-15

    This document reports the results of the activity management of the Comissao Nacional de Energia Nuclear - CNEN - Brazil during the year of 2004, involving the Brazilian program of nuclear activities in the areas of nuclear safety, research and development, radiopharmaceutical production, institutional management, teaching, administration in general and miscellaneous.

  10. Strategies for energy saving in warm climate dwellings; Estrategias de ahorro de energia para viviendas en clima calido

    Energy Technology Data Exchange (ETDEWEB)

    Pilatowsky, I [Centro de Investigacion en Energia, Universidad Nacional Autonoma de Mexico (Mexico); Ramos Niembro, Gaudencio [Comision Nacional para el Ahorro de Energia -CONAE (Mexico); Morillon, David [Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico (Mexico); Oskam, A. [Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico (Mexico)

    2008-04-15

    The domestic sector consumes almost one quarter of the national electrical energy. In order to reduce in an important manner the power consumption in dwellings there is an integral alternative based on three elements: the bio-climatic design, the saving and efficient use of the energy in equipment and apparatuses, and the use of centralized air conditioning systems. Besides saving the electrical and thermal power consumption, with this scheme, comfort conditions are pretended to be reached in dwellings and, contributing at the same time, to the diminution of polluting emissions. [Spanish] El sector domestico consume casi una cuarta parte de la energia electrica nacional. Con objeto de reducir de manera importante el consumo de energia en las viviendas, se presenta una alternativa integral, basada en tres elementos: el diseno bioclimatico, el ahorro y uso eficiente de la energia en equipos y aparatos, y la utilizacion de sistemas de climatizacion centralizados. Ademas del ahorro en el consumo de energia electrica y termica, con este esquema se pretende alcanzar condiciones de confort en las viviendas y, al mismo tiempo, contribuir a la disminucion de emisiones contaminantes.

  11. Energy consumption in the mexican iron and steel industry; Consumo de energia en la industria siderurgica mexicana

    Energy Technology Data Exchange (ETDEWEB)

    Elizalde Baltierra, A.; Garcia Pelaez, J.; Lopez Panadero, L.; Bauer Ephrussi, M.; Quintanilla Martinez, J. [Programa Universitario de Energia, UNAM, Mexico, D.F. (Mexico)

    1998-12-01

    An overview of the mexican iron and steel industry is presented, including the analysis of the sector's energy consumption by energy source (exogenous and endogenous) and by siderurgical process (basic oxygen conversion and electric arc furnace). The specific industry's energy consumption is shown, by both kind of enterprise (integrated and semi-integrated) and by siderurgical process (BOF and EAF). Finally, its international standing is examined in terms of overall specific energy consumption, specific coke consumption in high furnace, Siemens Martin furnace participation, and utilization degree of continuous casting. [Spanish] Se presenta un panorama actual de la industria siderurgica mexicana. Se analiza el consumo de energia en el sector por fuente de energia (exogena y endogena) y por proceso siderurgico (convertidor basico al oxigeno y horno electrico de arco). Se muestra ademas el consumo especifico de energia en la industria siderurgica por tipo de empresa (integrada y semi-integrada) y por proceso siderurgico (convertidor basico al oxigeno y horno electrico de arco). Finalmente, se situa a nivel internacional al sector, mediante comparaciones de consumo especifico de energia, consumo especifico de coque en el alto horno, participacion del horno Siemens Martin y grado de utilizacion de colada continua.

  12. Níveis de energia no desempenho e características da carcaça de cordeiros alimentados em creep feeding

    Directory of Open Access Journals (Sweden)

    Garcia Cledson Augusto

    2003-01-01

    Full Text Available O trabalho foi realizado no Setor de Ovinocultura da Universidade de Marília, objetivando estudar os efeitos de três níveis de energia (2,6; 2,8 e 3,0 Mcal EM/kg MS na ração de cordeiros inteiros Suffolk criados em creep feeding, sobre o desempenho e características de carcaça. Na parição numerava-se e registravam-se o peso ao nascer dos cordeiros que, posteriormente, foram distribuídos aleatoriamente, compondo doze repetições por tratamento. As rações foram isoprotéicas (18,46% PB fornecidas ad libitum duas vezes ao dia, pesando-se as respectivas sobras. Os cordeiros foram pesados a cada 14 dias, permanecendo com as ovelhas até atingirem o peso vivo final, preestabelecido em 31 kg. Em seguida, os cordeiros permaneceram em jejum alimentar por 16 horas, até o momento do abate, obtendo-se o peso vivo ao abate. Após o abate, registraram-se os pesos da carcaça quente e do conteúdo digestivo, para o cálculo do peso de corpo vazio. As carcaças permanecerem por 24 horas na câmara de refrigeração em temperatura de 5ºC, obtendo-se o peso da carcaça fria. Para o ganho médio diário ocorreu diferença significativa entre os tratamentos, utilizando-se como covariável a idade de abate, com melhor desempenho para os cordeiros que receberam a ração com 3,0 Mcal EM. Para as características da carcaça não houve efeito dos tratamentos. Concluiu-se que o nível 3,0 Mcal EM foi o mais indicado para a ração de cordeiros Suffolk alimentados e terminados em creep feeding.

  13. Inovar na produção de energia elétrica a partir do vento. O recurso a postes de eletricidade existentes

    OpenAIRE

    Franco, Miguel Leichsenring

    2012-01-01

    O vento é utilizado há milhares de anos para suprir as necessidades energéticas da atividade humana. A energia eólica é, como a maioria das fontes de energia renovável, uma forma de energia solar, tendo origem no aquecimento da atmosfera pelo sol, que põe em movimento as massas de ar. A rotação da terra, a forma e cobertura da superfície terrestre e os planos de água, influenciam por seu turno o regime dos ventos, ou seja, a velocidade, direção e variabilidade do vento...

  14. The electric energy and the environment in Mexico. Volume 3; Energia electrica y medio ambiente en Mexico. Volumen 3

    Energy Technology Data Exchange (ETDEWEB)

    Quintanilla Martinez, Juan [eds.] [Universidad Nacional Autonoma de Mexico, Mexico, D. F. (Mexico)

    1997-12-31

    This document is the third one of three volumes of the 1. Seminar on the Current Conditions and Perspectives of the Electric Sector in Mexico, organized by the Programa Universitario de Energia and the Instituto de Investigaciones Economicas (University Program of Energy and the Institute of Economic Research), both of them agencies of the Universidad Autonoma de Mexico (UNAM). The titles of the three volumes are the following: Volume 1.- The opening of the Mexican Electric Sector to foreign investment. Volume 2.- Concrete innovation and technological learning experiences at the Luz y Fuerza del Centro enterprise. Volume 3.- The Electric Energy and the Environment in Mexico. This third volume covers the following subjects: Hydroelectricity, land use and water managing; the electric generation in Mexico and its environmental impact, the nuclear electricity and the handling of radioactive materials; the exposure to electromagnetic fields and its association with children`s leukemia; the energy in Mexico and the sustainable development; potential of electricity generation in large scale with wind power in Mexico; towards a scheme of distributed electric power generation with non-conventional energies and renewable energy sources in Mexico in the 21Century. These documents were elaborated by specialists of the electric sector, from the sector itself as well as from private and public academic entities [Espanol] Este documento constituye el tercero de tres volumenes del Primer Seminario sobre Situacion y Perspectivas del Sector Electrico en Mexico, organizado por el Programa Universitario de Energia y el Instituto de Investigaciones Economicas, ambas dependencias de la Universidad Nacional Autonoma de Mexico (UNAM). Los titulos de los tres volumenes son los siguientes: volumen 1: La apertura externa del sector electrico mexicano, volumen 2: Experiencias concretas de innovacion y aprendizaje tecnologico en la empresa Luz y Fuerza del Centro, volumen 3: Energia electrica

  15. Electrical energy saving in motors and frequency variators; Ahorro de energia electrica en motores y variadores de frecuencia

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Neri, Roger [Comision Federal de Electricidad (CFE) (Mexico)

    2005-07-01

    The necessity of saving energy is urgent and undeniable. We must already begin with the rational use of energy. Which is obtaining the maximum benefit of the consumed energy and of the necessary facilities for its generation, transmission and use. Guaranteeing at the same time an operation free of interferences or interruptions for the users. The electricity in alternating current does not allow its storage, reason why it is necessary to generate and distribute it at the precise moment when it is required. This forces to determine the proportions of the generation facilities, to be able to feed the periods of maximum demand called {sup p}eaks{sup .} It is this very point where the problem of the inappropriate use of the electrical energy starts. The energy waste is self-evident during the periods of low demand because of the low efficiency of the sub-utilized facilities. Electrical motors of the induction type use approximately more than 60% of the energy in the industry. If we use high efficiency motors instead of standard motors, a better advantage of the energy demanded from Comision Federal de Electricidad (CFE) is obtained. [Spanish] Es impostergable e innegable la necesidad de ahorrar energia. Tenemos que empezar ya con el uso racional de la energia: Obtener el maximo beneficio de la energia consumida y de las instalaciones necesarias para su generacion, transmision y utilizacion. Garantizando a los usuarios un funcionamiento sin interferencias o interrupciones. La electricidad en corriente alterna no permite su almacenamiento, por lo que es necesario generarla y distribuirla en el momento preciso en que es requerida. Esto obliga a dimensionar las instalaciones de generacion, para poder alimentar los periodos de maxima demanda llamados pico. Desde esta parte inicia el problema de la mala utilizacion de la energia electrica. Ya que en los periodos de baja demanda, las instalaciones se encuentran subutilizadas y si su eficiencia es muy baja, el desperdicio de

  16. AVALIAÇÃO DA DIVERSIDADE GENÉTICA EM UMA POPULAÇÃO DE Eucalyptus spp. UTILIZANDO MARCADOR MICROSSATÉLITE (SSR

    Directory of Open Access Journals (Sweden)

    Mayara Martins Aparecido

    2016-12-01

    Full Text Available No melhoramento genético de espécies florestais a variabilidade genética constitui a matéria-prima do programa sobre a qual são realizados os processos de seleção. Esse método visa selecionar os indivíduos de melhores procedências garantindo a obtenção de ganhos genéticos de forma continua. O objetivo deste trabalho foi avaliar a diversidade genética existente em uma população de eucalipto da Fibria Celulose S.A utilizando marcadores microssatélites (SSR que sejam informativos para esse tipo de estudo. Foram avaliados 75 indivíduos através de reações de PCR (Polymerase Chain Reaction, utilizando-se 9 primers seguidas de eletroforese em gel de agarose. O número de alelos encontrado para cada primer variou de 4 a 7 alelos. A heterozigosidade esperada teve uma média de 0,7 para a população avaliada. A análise de discriminação realizada por este tipo de marcador possibilitou o agrupamento dos indivíduos em quatro grupos distintos. Os resultados obtidos demonstram que o uso de marcadores microssatélites (SSR permitiu verificar a existência e quantificar a diversidade genética da população selecionada para este estudo.

  17. Preparation of continuous alumina gel fibres by aqueous sol–gel ...

    Indian Academy of Sciences (India)

    sol–gel process using aluminum-tri-isopropoxide as starting materials, and Shojaie-Bahaabad et al (2008) synthesized composite fibres (YAG/Al2O3) from an aqueous solution of aluminum powder, aluminum chloride hexahydrate and yttrium oxide by the sol–gel method. But, the preparation processes of continuous gel ...

  18. FONTES ALTERNATIVAS E RENOVÁVEIS DE ENERGIA NO BRASIL: MÉTODOS E BENEFÍCIOS AMBIENTAIS

    Directory of Open Access Journals (Sweden)

    Raphael Santos do Nascimento

    2017-01-01

    Full Text Available Resumo: Atualmente, os recursos renováveis tem sido o foco de inúmeras pesquisas, devido à preocupação com o meio ambiente. Nesse sentido, várias são as razões para a implementação de fontes renováveis de energia. Assim, o objetivo desse estudo foi identificar os diferentes tipos de energias renováveis existentes no Brasil, bem como, a aplicabilidade e o impacto ambiental gerado por essas fontes. O trabalho foi desenvolvido sobre os preceitos do estudo exploratório por meio de uma pesquisa bibliográfica. Foram identificados cinco tipos de energias alternativas renováveis no Brasil, Biomassa, Eólica, Geotérmica, Hidráulica, Marítima e Solar. A energia Solar foi considerada a mais viável em função de sua aplicabilidade, mesmo em locais isolados, do potencial encontrado em todo território, e, a redução dos impactos ambientais. Foram consideradas expressivas as diferenças de impacto ambiental entre as fontes estudadas e as fontes não-renováveis. Ainda, identificou-se que mesmo com diversas alternativas energéticas e um imenso potencial de recursos renováveis, a utilização desses recursos no Brasil deve ser considerada insuficiente para geração de energia.

  19. Topological characteristics of model gels

    International Nuclear Information System (INIS)

    Miller, Mark A; Hansen, Jean-Pierre; Blaak, Ronald

    2010-01-01

    The Euler characteristic of an object is a topological invariant determined by the number of handles and holes that it contains. Here, we use the Euler characteristic to profile the topology of model three-dimensional gel-forming fluids as a function of increasing length scale. These profiles act as a 'topological fingerprint' of the structure, and can be interpreted in terms of three types of topological events. As model fluids we have considered a system of dipolar dumbbells, and suspensions of adhesive hard spheres with isotropic and patchy interactions in turn. The correlation between the percolation threshold and the length scale on which the Euler characteristic passes through zero is examined and found to be system-dependent. A scheme for the efficient calculation of the Euler characteristic with and without periodic boundary conditions is described.

  20. Chitosan: Gels and Interfacial Properties

    Directory of Open Access Journals (Sweden)

    Julie Nilsen-Nygaard

    2015-03-01

    Full Text Available Chitosan is a unique biopolymer in the respect that it is abundant, cationic, low-toxic, non-immunogenic and biodegradable. The relative occurrence of the two monomeric building units (N-acetyl-glucosamine and d-glucosamine is crucial to whether chitosan is predominantly an ampholyte or predominantly a polyelectrolyte at acidic pH-values. The chemical composition is not only crucial to its surface activity properties, but also to whether and why chitosan can undergo a sol–gel transition. This review gives an overview of chitosan hydrogels and their biomedical applications, e.g., in tissue engineering and drug delivery, as well as the chitosan’s surface activity and its role in emulsion formation, stabilization and destabilization. Previously unpublished original data where chitosan acts as an emulsifier and flocculant are presented and discussed, showing that highly-acetylated chitosans can act both as an emulsifier and as a flocculant.

  1. Using Greener Gels to Explore Rheology

    Science.gov (United States)

    Garrett, Brendan; Matharu, Avtar S.; Hurst, Glenn A.

    2017-01-01

    A laboratory experiment was developed to investigate the rheological properties of a green calcium-cross-linked alginate gel as an alternative to the traditional borax-cross-linked poly(vinyl alcohol) gel. As borax is suspected of damaging fertility and the unborn child, a safe, green alternative is necessary. The rheological properties of a…

  2. nanocomposite hydrogels with high gel strength

    Indian Academy of Sciences (India)

    used in many fields such as hygienic products,1 agriculture,2,3 waste water treatment,4,5 drug-delivery systems6– ... commercially synthesized hectorite product was used to prepare NC gels by inverse microemulsion poly- ... 2.4 Gel strength evaluation of the nanocomposite hydrogels. The apparent viscosity was a relative ...

  3. Sodium Dedecyl Suphate Polyacrilamide Gel Electrophosis of ...

    African Journals Online (AJOL)

    Sodium Dedecyl Suphate Polyacrilamide Gel Electrophosis of Campylobacter coli. S.I. Smith, M.M. Ibrahim, V.N. Ezeobi, K.S. Oyedeji, K.A. Akinsinde, A.O Coker. Abstract. Campylobacter coli were characterized using sodium dodecyl sulphate-polyacrilamide gel electrophoresis (SDS-PAGE). The isolates were obtained ...

  4. Serum release boosts sweetness intensity in gels

    NARCIS (Netherlands)

    Sala, G.; Stieger, M.A.; Velde, van de F.

    2010-01-01

    This paper describes the effect of serum release on sweetness intensity in mixed whey protein isolate/gellan gum gels. The impact of gellan gum and sugar concentration on microstructure, permeability, serum release and large deformation properties of the gels was determined. With increasing gellan

  5. Nondenaturing agarose gel electrophoresis of RNA.

    Science.gov (United States)

    Rio, Donald C; Ares, Manuel; Hannon, Gregory J; Nilsen, Timothy W

    2010-06-01

    INTRODUCTION Perhaps the most important and certainly the most often used technique in RNA analysis is gel electrophoresis. Because RNAs are negatively charged, they migrate toward the anode in the presence of electric current. The gel acts as a sieve to selectively impede the migration of the RNA in proportion to its mass, given that its mass is generally proportional to its charge. Because mass is approximately related to chain length, the length of an RNA is more generally determined by its migration. In addition, topology (i.e., circularity) can affect migration, making RNAs appear longer on the gel than they actually are. There are two common types of gel: polyacrylamide and agarose. For most applications involving RNAs of or =600 nucleotides, and are especially useful for analysis of mRNAs (e.g., by Northern blotting). RNA analysis on agarose gels is essentially identical to DNA analysis (except that the gel boxes used must be dedicated to RNA work or to other ribonuclease-free work). Here we describe the use of straightforward Tris borate, EDTA (TBE) gels for routine analysis. These gels are appropriate for determining the quantity and integrity of RNA before using it for other applications. This procedure should not be used to determine size with accuracy, because the RNA will not remain in its extended state throughout the run.

  6. Fast Processing of Sol-Gel TCO

    NARCIS (Netherlands)

    Deelen, J. van; Rem, M.; Arfsten, N.; Buskens, P.P.

    2016-01-01

    TCOs are usually deposited using sputtering or chemical vapor deposition, which have a yield of typically 50-75%. The sol gel method does not need low pressure and can be done with a high precursor yield in the range of 90 – 100%. Sol gel enables also the TCO function as a planarization or

  7. Recrystallization of amylopectin in concentrated starch gels

    NARCIS (Netherlands)

    Keetels, CJAM; Oostergetel, GT; vanVliet, T

    The relation between the recrystallization of amylopectin and the increase in stiffness of starch gels during storage was studied by various techniques. From transmission electron microscopy it was concluded that the size of the crystalline domains in retrograded 30% w/w potato starch gels was about

  8. Silica gel matrix immobilized Chlorophyta hydrodictyon africanum ...

    African Journals Online (AJOL)

    Chlorophyta hydrodictyon africanum was immobilized on a silica gel matrix to improve its mechanical properties. The algae-silica gel adsorbent was used for batch sorption studies of a cationic dye, methylene blue (MB). Optimum adsorption was obtained with a dosage of 0.8 g bio sorbent. Results from sorption studies ...

  9. Polymer architecture of magnetic gels: a review

    Science.gov (United States)

    Weeber, Rudolf; Hermes, Melissa; Schmidt, Annette M.; Holm, Christian

    2018-02-01

    In this review article, we provide an introduction to ferrogels, i.e. polymeric gels with embedded magnetic particles. Due to the interplay between magnetic and elastic properties of these materials, they are promising candidates for engineering and biomedical applications such as actuation and controlled drug release. Particular emphasis will be put on the polymer architecture of magnetic gels since it controls the degrees of freedom of the magnetic particles in the gel, and it is important for the particle-polymer coupling determining the mechanisms available for the gel deformation in magnetic fields. We report on the different polymer architectures that have been realized so far, and provide an overview of synthesis strategies and experimental techniques for the characterization of these materials. We further focus on theoretical and simulational studies carried out on magnetic gels, and highlight their contributions towards understanding the influence of the gels’ polymer architecture.

  10. On shear rheology of gel propellants

    Energy Technology Data Exchange (ETDEWEB)

    Rahimi, Shai; Peretz, Arie [RAFAEL, MANOR Propulsion and Explosive Systems Division, Haifa (Israel); Natan, Benveniste [Faculty of Aerospace Engineering, Technion - Israel Institute of Technology, Haifa (Israel)

    2007-04-15

    Selected fuel, oxidizer and simulant gels were prepared and rheologically characterized using a rotational rheometer. For fuel gelation both organic and inorganic gellants were utilized, whereas oxidizers and simulants were gelled with addition of silica and polysaccharides, respectively. The generalized Herschel-Bulkley constitutive model was found to most adequately represent the gels studied. Hydrazine-based fuels, gelled with polysaccharides, were characterized as shear-thinning pseudoplastic fluids with low shear yield stress, whereas inhibited red-fuming nitric acid (IRFNA) and hydrogen peroxide oxidizers, gelled with silica, were characterized as yield thixotropic fluids with significant shear yield stress. Creep tests were conducted on two rheological types of gels with different gellant content and the results were fitted by Burgers-Kelvin viscoelastic constitutive model. The effect of temperature on the rheological properties of gel propellant simulants was also investigated. A general rheological classification of gel propellants and simulants is proposed. (Abstract Copyright [2007], Wiley Periodicals, Inc.)

  11. FTIR thermal analysis on organofunctionalized silica gel

    Directory of Open Access Journals (Sweden)

    Foschiera José L.

    2001-01-01

    Full Text Available Silica gel modified with organic groups is widely used as a stationary phase for liquid chromatography. Grafting synthesis can be used to obtain stable modified silica gel surfaces. In this work, silica gel (10 nm of pore diameter and surface area of 320 m² g-1 was chemically modified with 3-chloropropyltrimethoxysilane or 3-aminopropyltrimethoxysilane and reacted with aniline, p-anisidine, benzylamine and 3-phenylpropylchloride in order to yield aromatic groups immobilized on the silica gel surface. Infrared spectroscopy was utilized for characterization of the aromatic groups grafted on the silica gel surface, using a quartz cell. The solids were heated at several temperatures in high vacuum and the infrared band areas of the organic groups were used to evaluate the thermal stability.

  12. Recent Advances in Supramolecular Gels and Catalysis.

    Science.gov (United States)

    Fang, Weiwei; Zhang, Yang; Wu, Jiajie; Liu, Cong; Zhu, Haibo; Tu, Tao

    2018-04-04

    Over the past two decades, supramolecular gels have attracted significant attention from scientists in diverse research fields and have been extensively developed. This review mainly focuses on the significant achievements in supramolecular gels and catalysis. First, by incorporating diverse catalytic sites and active organic functional groups into gelator molecules, supramolecular gels have been considered as a novel matrix for catalysis. In addition, these rationally designed supramolecular gels also provide a variety of templates to access metal nanocomposites, which may function as catalysts and exhibit high activity in diverse catalytic transformations. Finally, as a new kind of biomaterial, supramolecular gels formed in situ by self-assembly triggered by catalytic transformations are also covered herein. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  13. The alternative and renewable energy sources in Mexico; Fuentes alternativas y renovables de energia en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Urbano C, J. Antonio [Instituto Politecnico Nacional, Mexico, D. F. (Mexico); Matsumoto K, Yasuhiro; Asomoza P, Rene [Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Mexico, D. F. (Mexico)

    1996-12-31

    This paper presents an overview of the efforts that have been made in our Mexico in the area of Alternative and Renewable Sources of Energy, effort performed by different institutions, government agencies and private companies along the last 25 years. Older periods are not contemplated, although significant advances have existed, specifically in the area of small micro-hydraulic power plants, since the end of the past century and in solar collectors, more than 60 years ago, as the most relevant advances have been contemplated in these last two decades. The entire world energy demand is analyzed, making emphasis in our country, the efforts on the installed geothermal power plants, the flat collectors for domestic use, the solar power plants installed by some government agencies are also mentioned, as well as the strong growth in the photo-voltaic field at worldwide level as well as at domestic level (a graph is presented of the multiple applications of the photo-voltaic conversion of the solar energy at world level of which some of these are already operational in our country), including the hybrid systems (wind power photo-voltaic Diesel, the pilot biogas plants, the solar ponds efforts and the recently inaugurated wind-power plant of 1.575 MW installed at La Venta, in the Oaxaca State. [Espanol] El presente articulo, presenta una revision de los esfuerzos que se han desarrollado en nuestro Mexico, en el campo de las Fuentes Alternas y Renovables de Energia, esfuerzos realizados por diferentes instituciones, dependencias y companias a lo largo de los ultimos 25 anos. No se contemplan periodos mas antiguos, aunque han existido adelantos significativos, especificamente, en el campo de pequenas centrales microhidraulicas desde fines del siglo, y de colectores solares desde hace mas de 60 anos, ya que los mas relevantes se contemplan en estas ultimas dos decadas de recopilacion. Se analiza la demanda de energia mundial, haciendo enfasis a nuestro pais, se mencionan los

  14. Renewable energy to produce electricity; Nuevas fuentes de energia para producir electricidad

    Energy Technology Data Exchange (ETDEWEB)

    Cadenas Tovar, Roberto; Lopez Rios, Serafin [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia (Mexico)

    1996-05-01

    There are several new energy sources to produce electricity. One of them is the wind energy, which has reached huge commercialization in worldwide. There are in Mexico some zones with high speed wind, which can be used in a short term. This has been proved by the wind pilot power plant of La Venta, Oaxaca, where production costs of US 4.3 cents per kilowatt-hour (kWh) have been obtained. These costs are among the lowest in the world. By the other hand, among the main uses of solar energy, including both thermal and photovoltaic techniques, the biggest thermo-solar utility, with 350 megawatts (MW) of capacity, is remarkable. This is the plant located in the Mojave Desert, California, USA. In Mexico there is big potential, which can make an important contribution to supplies of electricity. Biomass is another important renewable source, particularly the use of solid municipal waste, the livestock and the wood waste. Finally, other alternate technique is represented by the fuel cells, though it is not properly renewable. However, considering its modular and low environmental impact characteristics, it can get a wide commercial development in the next decade. [Espanol] Existen diversas fuentes nuevas de energia para generar electricidad. Entre ellas, la energia eolica es una de las tecnologias alternas que mayor comercializacion ha alcanzado a nivel mundial. Mexico posee zonas con vientos de velocidades altas en las que su aplicacion puede ser inmediata, como lo prueba la experiencia obtenida con la central piloto de La Venta, Oaxaca, en donde se han alcanzado costos de produccion de 4.3 centavos de dolar por kilowatt-hora (kWh), de los mas bajos a nivel internacional. Por otra parte, entre las principales aplicaciones de la energia solar, en sus tecnologias termica y fotovoltaica, destaca el mayor de los aprovechamientos termosolares, con 350 megawatts de capacidad (MW), localizado en el desierto de Mojave, en California, EUA. En Mexico hay un gran potencial

  15. Economizing energies in urban public transportation; Como economizar energias en el transporte publico urbano

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Arellano, Ignacio [Universidad Autonoma del Estado de Mexico, Toluca (Mexico)

    1998-12-31

    In the transportation sector one of the questions that we should keep on asking on the subject of energy saving is: What objective should be set for reducing the energy consumption (particularly in oil derivatives). Must it be a moderate or a strong measure? In the past years this question was very much related to the oil availability that is a non-renewable resource, nevertheless, with the elapsing of time it can be said that the available oil resources are still very large, the problem is now in function of the energy prices in the mid term and this is what will take us to establish a type of policy for the reduction of the use of fuels in transportation. The purpose of this paper, is to have the support of the transportation users informing and persuading them on the need of reducing the fuel consumption rationalizing its utilization, to ensure in our cities a relatively fluid circulation, a breathable air, a better landscape and a protection to the urban sites. Although these proposals belong in a direct way to our governments, the base of their definition will be the perspectives for the country`s development, the amount of oil reserves, the international situation and the technological advances. [Espanol] En el sector de los transportes una de las preguntas que nos deberiamos seguir haciendo, sobre el tema de ahorro de energia es que objetivo debera fijarse para reducir los consumos de energia (en particular de los derivados del petroleo) debe ser una medida fuerte o moderada. En anos pasados esta pregunta estaba muy relacionada con la disponibilidad del petroleo que es un recurso no renovable, sin embargo con el transcurso del tiempo se puede decir que los recursos disponibles de petroleo son aun muy grandes, el problema ahora esta en funcion de los precios de la energia en el mediano plazo, y es esto lo que nos llevara a fijar un tipo de politica para la reduccion de combustibles en los transportes. El proposito de este trabajo es contar con el apoyo de los

  16. Energia e Liberdade: Aspectos de Economia Política e Energia na Região da Amazônia Meridional de Mato Grosso

    Directory of Open Access Journals (Sweden)

    José Manuel Carvalho Marta

    2011-06-01

    Full Text Available Normal 0 21 false false false PT-BR X-NONE X-NONE A Amazônia Meridional é formada por cinco estados brasileiros, nos quais está Mato Grosso. Nessa região, com densa mata, a energia elétrica apresenta impactos sociais e ambientais para sua implantação, mas é essencial no processo da transformação, dadas as características da população: pobre e isolada. O artigo procura interpretar, à luz de métodos de análise dialética, institucional e de economia solidária, os resultados de uma pesquisa realizada parcialmente entre 2004-2006 e suas consequências. Considera-se o desmatamento e a manutenção das linhas de transmissão, em face da geração distribuída. buscando implantar uma vida melhor para os assentados em Guariba, município de Colniza-MT.

  17. Gelatin increases the coarseness of whey protein gels and impairs water exudation from the mixed gel at low temperatures

    NARCIS (Netherlands)

    Martin, A.H.; Bakhuizen, E.; Ersch, C.; Urbonaite, V.; Jongh, H.H.J. de; Pouvreau, L.

    2016-01-01

    To understand the origin of water holding of mixed protein gels, a study was performed on water exudation from mixed whey protein (WP)-gelatin gels upon applied pressure. Mixed gels were prepared with varying WP and gelatin concentration and gelatin type to obtain gels with a wide range of gel

  18. Internal structure analysis of particle-double network gels used in a gel organ replica

    Science.gov (United States)

    Abe, Mei; Arai, Masanori; Saito, Azusa; Sakai, Kazuyuki; Kawakami, Masaru; Furukawa, Hidemitsu

    2016-04-01

    In recent years, the fabrication of patient organ replicas using 3D printers has been attracting a great deal of attention in medical fields. However, the cost of these organ replicas is very high as it is necessary to employ very expensive 3D printers and printing materials. Here we present a new gel organ replica, of human kidney, fabricated with a conventional molding technique, using a particle-double network hydrogel (P-DN gel). The replica is transparent and has the feel of a real kidney. It is expected that gel organ replicas produced this way will be a useful tool for the education of trainee surgeons and clinical ultrasonography technologists. In addition to developing a gel organ replica, the internal structure of the P-DN gel used is also discussed. Because the P-DN gel has a complex structure comprised of two different types of network, it has not been possible to investigate them internally in detail. Gels have an inhomogeneous network structure. If it is able to get a more uniform structure, it is considered that this would lead to higher strength in the gel. In the present study we investigate the structure of P-DN gel, using the gel organ replica. We investigated the internal structure of P-DN gel using Scanning Microscopic Light Scattering (SMILS), a non-contacting and non-destructive.

  19. Energia Avastuskeskus : Tallinna Elektrijaama restaureerimine = Energy Discovery Centre : restoration of Tallinn Power Plant / Pelle-Sten Viiburg, Margit Argus, Margit Aule

    Index Scriptorium Estoniae

    Viiburg, Pelle-Sten

    2015-01-01

    Energia Avastuskeskus endises Tallinna Elektrijaama hoones Põhja pst 29, valminud 2014. Arhitektid Sander Aas, Margit Aule, Pelle-Sten Viiburg (KAOS Arhitektid), sisearhitekt Margit Argus (KAOS Arhitektid), ekspositsiooni kujundus Margit Argus ja Margit Aule. 2014. aasta Kultuurkapitali Arhitektuuripreemia kandidaat

  20. Substituição do milho pela farinha de varredura de mandioca (Manihot esculenta Crantz em rações de ovinos: consumo, digestibilidade, balanços de nitrogênio e energia e parâmetros ruminais

    Directory of Open Access Journals (Sweden)

    Zeoula Lúcia Maria

    2003-01-01

    Full Text Available Avaliaram-se os efeitos dos níveis de substituição do milho (MI pela farinha de varredura de mandioca (FV (25, 50, 75 e 100% em rações para ovinos, sobre consumo voluntário, digestibilidade total dos nutrientes, balanços de nitrogênio (BN e de energia (BE, pH e concentração de nitrogênio amoniacal (N-NH3 do líquido ruminal. Foram utilizados quatro carneiros machos, castrados, sem raça definida, com peso médio de 41,4 kg de peso vivo em um ensaio de digestibilidade utilizando o método de coleta total de fezes e urina. Os animais foram mantidos em gaiolas metabólicas, distribuídos em delineamento experimental quadrado latino 4x4. O líquido ruminal foi obtido por meio de sonda esofágica, nos tempos de zero, 2, 4, 6 e 8 horas após à alimentação da manhã. Não houve efeito dos níveis de substituição para os consumos de matéria seca (MS, matéria orgânica (MO, fibra em detergente neutro (FDN, energia e nitrogênio (N, para os coeficientes de digestibilidade da MS, MO, PB, FDN, amido e energia bruta (EB, e para o BN e os teores de NDT. O consumo de amido e EB apresentaram efeito quadrático crescente até o nível de 75% de FV na ração. A concentração de N amoniacal e o pH do líquido ruminal não diferiram em função do nível de substituição do MI pela FV. Concluindo-se que a FV pode substituir totalmente o MI nas rações de ovinos.

  1. Projeto, adaptação, instalação e testes preliminares para um sistema de medida de energia de fratura de materiais cerâmicos pelo método da cunha Design, adaptation, installation and preliminary testing of a fracture energy measuring system for ceramic materials based on the wedge splitting method

    Directory of Open Access Journals (Sweden)

    S. Ribeiro

    2008-12-01

    Full Text Available Este trabalho discute o projeto e a instalação dos dispositivos para determinação da energia de fratura em materiais cerâmicos utilizando o método da cunha patenteado, além dos resultados preliminares de carga máxima e energia de fratura para duas argamassas. Para testar o sistema, e conseqüentemente implantar o método, foram preparadas argamassas com cimento Portland, areia e água, moldadas, curadas a 25 ºC por 7 dias e secas a 50 ºC por 48 h. Foram caracterizadas duas proporções de areia:cimento de 3:1 e 2:1. A partir dos testes preliminares foram estabelecidas as condições de propagação estável da trinca. A trinca percorre um plano imaginário definido por ranhuras laterais da amostra. O método está plenamente instalado e pronto para o desenvolvimento de trabalhos sistemáticos correlacionando energia de fratura e microestruturas de refratários e cerâmicas em geral, incluindo materiais para construção civil. Além do pleno funcionamento do método para temperatura ambiente, os resultados mostram que a técnica é sensível aos aspectos microestruturais do material caracterizado, distinguindo, neste trabalho, entre as duas composições de argamassas empregadas.This paper discusses the design and installation of devices for determining fracture energy in ceramic materials based on the patented wedge splitting test. Preliminary results of the maximum load and fracture energy for two different mortar compositions are also shown. To test the system and apply the method, mortars made of Portland cement, sand and water were molded and cured at 25 ºC for 7 days and dried at 50 ºC for 48 h. Two cement-sand composition ratios were characterized: 3:1 and 2:1. Preliminary tests were applied to establish stable crack propagation conditions. The crack was found to propagate through an imaginary plane defined by lateral grooves in the sample. The system is fully installed and ready for the development of systematic works

  2. Carbon Bonds and the saving of energy; Bonos de carbono y el ahorro de energia

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez Ramirez, Alejandro [NovaEnergia (Mexico)

    2005-07-01

    This document deals with the development of the carbon bond project, the energy saving and the entry into force of the Kyoto Protocol at a world-wide level. In this project Mexico opts for a development model in which the economic growth brakes ties with the discharge of greenhouse effect gases and in which the progress does not mean more damages to our planet. [Spanish] Este documento trata sobre el desarrollo del proyecto de bonos de carbono, ahorro de energia y la entrada en vigor del Protocolo de Kyoto a nivel mundial, en el cual Mexico opta por un modelo de desarrollo en el que el crecimiento economico esta desvinculado de la emision de gases de efecto invernadero y en donde el progreso no signifique mas danos a nuestro planeta.

  3. Energy and telecommunications public services; Servizi pubblici nei settori dell'energia e delle telecomunicazioni

    Energy Technology Data Exchange (ETDEWEB)

    Salini, M. P. [Ente Nazionale Idrocarburi SpA, Rapporti Istituzionali per l' Italia e l' Unione Europea, Milan (Italy)

    2001-03-01

    The aim of this work is the evolution of the energy and telecommunication public services. The article runs through the main stages in the public services' history and shows how open market rules may cause the future dissolution of public service notion. The conclusion wishes the hastening of public services privatisation and a Corporate Governance reform as a mean to pursue general interest. [Italian] Oggetto di questo lavoro e' l'evoluzione dei servizi pubblici nei settori dell'energia e delle telecomunicazioni. Se ne ripercorrono le principali tappe storiche e si evidenzia come le regole di apertura dei mercati possano causare la dissoluzione del concetto di servizio pubblico. Le conclusioni sottolineano la necessita' di accelerare la privatizzazione dei servizi pubblici e la riforma della Corporate Governance come strumento per il raggiungimento dell'interesse generale.

  4. The Energy Regulatory Commission (1). Law of the Comision Reguladora de Energia

    International Nuclear Information System (INIS)

    1995-01-01

    The Energy Regulatory Commission. Reforms to the Electric Energy Public Service Law (1992) and the Regulatory Law of Article 27 on Petroleum (1995) have brought about fundamental changes in the electric and natural gas industries. The legal reforms explicitly permit the private sector to construct, operate, and own, systems of electric generation and natural gas transportation, storage and distribution. The participation of the private sector in these areas required a redefinition in the government regulatory institutions. Accordingly the Federal Congress enacted the law of the Comision Reguladora de Energia (CRE) in 1995. The CRE law expands the scope of the CRE's authority and the breadth of its powers beyond those established when it was initially created in 1993. The CRE commenced operations in January 1994 as a decentralized technical and consultative body of the Energy Ministry. The decree that created the Commission limited the scope of its authority to an analysis and consultative role applicable only to the electric industry. (Author)

  5. Project of renewable energy for agriculture; Proyecto de energia renovable para la agricultura

    Energy Technology Data Exchange (ETDEWEB)

    Montufar Avilez, Octavio [FIRCO (Mexico)

    2005-07-01

    The document presents a general design of the hydraulic system, a hydraulic design of cattle ranch and a hydraulic design by dripping. It also discusses the components of the energy project, which are: institutional fortification, promotion and diffusion, market development (studies), specifications and certification, investments, technical support and direction of the project. The objective of this project is to diminish ignorance in the sector, to reduce the investment costs and to obtain a long term-sustainable effect. [Spanish] En este documento se describe un diseno general del sistema hidraulico, un diseno hidraulico de ganaderia, un diseno hidraulico por goteo y los componentes del proyecto de energia que son: fortalecimiento institucional, promocion y difusion, desarrollo del mercado (estudios), especificaciones y certificacion, inversiones, asistencia tecnica y direccion del proyecto. El objetivo de este proyecto es minimizar el desconocimiento en el sector, reducir los costos de inversion y que el efecto sea sostenible a largo plazo.

  6. Energy conservation in ice manufacturing; Ahorro de energia en la fabricacion de hielo

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1993-12-31

    This paper shows the results of the energy diagnosis study for ice manufacturing industries. The identified opportunities for conservation and efficient use of energy have allowed the reduction of the electric bill, modernizing at the same time, its installations and addressing inherent aspects of the use of energy producing items; in which the estimated investments are recovered in its major part in a period of a year, the goodness of the investments propitiate the growth and competitiveness required in these days. [Espanol] En este documento se exponen los resultados del estudio del diagnostico energetico para industrias productoras de hielo. Las oportunidades de ahorro y uso eficiente de energia identificadas, han permitido reducir la facturacion energetica, a la par de modernizar sus instalaciones y atender aspectos inherentes al uso de energeticos; en lo cual las inversiones estimadas se recuperan en su mayoria en un ano, las bondades de las inversiones propician un crecimiento y competitividad requerida en estos dias.

  7. Digestibility of nutrients and energy of cultivars of forage palm for growing Nile tilapiaDigestibilidade de nutrientes e energia de variedades de palma forrageira para tilápia do Nilo em crescimento

    Directory of Open Access Journals (Sweden)

    Marta Sales Oliveira

    2013-06-01

    Full Text Available The objective was to evaluate the apparent digestibility coefficients of nutrients and energy of five cultivars of forage palm (orelha de onça, miúda, gigante, IPA 20 and comum for growing Nile tilapia (110.02±16.17 g. The study design was completely randomized with five treatments, three replicates of eight fish per experimental unit. The diets were composed of 300 g/kg of each cultivar of the palm and 700 g/kg of the basal diet. Masculinized fish were distributed in circular feed tanks (150 L and kept in closed circulation of water and constant aeration. The digestibility was estimated by indirect method, using 1.0 g/kg chromic oxide as an indicator of the diet and the feces was collected the day after the last feed in digestibility aquariums. The cultivars comum and onça presented the best values for dry matter digestibility (53.5%. The lowest value for crude protein digestibility was obtained to cultivar gigante (60% and all cultivars tested showed gross energy digestibility below 50%. Nile tilapia has limitation on the digestibility of dry matter, gross energy, crude protein and amino acids of the cultivars of forage palm IPA 20, miúda, gigante, comum and orelha de onça.Objetivou-se avaliar os coeficientes de digestibilidade aparente de nutrientes e energia de cinco variedades de farelos de palma forrageira (orelha de onça, miúda, gigante, IPA 20 and comum para tilápia do Nilo em crescimento (110,02 ± 16,17 g. As tilápias, masculinizadas, foram distribuídas em tanques circulares de alimentação (150 L, mantidos em circulação fechada de água e aeração constante. Foi montado um delineamento inteiramente casualizado, composto por cinco tratamentos, três repetições e oito peixes por unidade experimental. As rações teste foram compostas de 30% de cada cultivar da palma e 70% da ração referência. A digestibilidade foi estimada pelo método indireto, utilizando-se óxido crômico a 0,1% da ração como indicador

  8. Requerimentos de energia e nutrientes da população brasileira

    Directory of Open Access Journals (Sweden)

    Ignez Salas Martins

    1979-09-01

    Full Text Available Foram estimados os requerimentos de energia, proteínas, vitamina A, B1, B2, C, D, B12, ácido fólico e dos minerais ferro e cálcio da população brasileira. Foi utilizada a metodologia recomendada nos relatórios técnicos dos Comitês de Peritos FAO/OMS. Partindo-se da pressuposição de que, até 19 anos de idade, o indivíduo tem um potencial de desenvolvimento a ser atingido, as recomendações de energia foram estabelecidas tomando-se como referência o percentil 97 da população. Os requerimentos dos adultos foram estimados para o homem-tipo e mulher-tipo representativos da população brasileira do percentil 50. As recomendações de proteínas e dos demais nutrientes foram calculadas para atender as necessidades de 95% da população.The requirements for energy, proteins, vitamins - A, B1, B2, C, D, B12 - Folie acid, and iron and calcium were estimated and for this purpose the method recommended by the FAO/OMS committees was used. Based on the presupposition that an individual achieves a development potential by the age of 19, energy requirements were established using as references the 97th percentile of the population. Adult requirements were estimated for the typical-man and typical-woman, representative of the 50th percentile of the Brazilian population. The protein requirements and those of the other nutrients were calculated to meet the needs of the 95th percentile of the population.

  9. Energy saving in the sugar cane agroindustry; Ahorro de energia en la agroindustria azucarera canera

    Energy Technology Data Exchange (ETDEWEB)

    Zedillo Ponce de Leon, Luis [Grupo de paises Latinoamericanos y del Caribe exportadores de azucar (Mexico)

    1996-07-01

    The traditional sugar mill is inefficient from the energy point of view. Most of the sugar mills were designed to use all the available bagasse, due to the risk of spontaneous ignition and environmental pollution. Consequently, the steam generators, the turbines and other components were designed to work with low efficiencies. Each ton of sugar produced generates a power potential equivalent to four to six oil barrels (bagasse and residues). That is to say, a sugar mill is capable of producing 500 ton/day of sugar, equivalent to an oil well of 2000 to 3000 barrels/day and one thermoelectric power plant of 15,000 kW. Under this context an analysis is made of the sugar mills in Latin America and the Caribbean as one of the ways of increasing their efficiency and obtain great energy savings. As far as steam generation the appropriate use of energy is dictated by the boilers' efficiency. [Spanish] El ingenio azucarero tradicional es ineficiente desde el punto de vista energetico. La mayoria de los ingenios azucareros se disenaron para usar todo el bagazo disponible, debido al riesgo de ignicion espontanea y contaminacion. En consecuencia, los generadores de vapor, las turbinas y demas componentes fueron disenados para trabajar con bajas eficiencias. Cada tonelada de azucar producida genera una potencialidad energetica equivalente de cuatro a seis barriles de petroleo (bagazo y residuos). Es decir, un ingenio capaz de producir 500 ton/dia de azucar equivalente a un pozo de petroleo de 2000 a 3000 barriles/dia y una termoelectrica de 15000 kW. Bajo este contexto se hace un analisis del ingenio azucarero en Latinoamerica y el Caribe como una de las vias para incrementar su eficiencia y lograr grandes ahorros en la energia. En cuanto a generacion de vapor se refiere, el buen uso de la energia viene expresado por la eficiencia de las calderas.

  10. Sol-gel bonding of silicon wafers

    International Nuclear Information System (INIS)

    Barbe, C.J.; Cassidy, D.J.; Triani, G.; Latella, B.A.; Mitchell, D.R.G.; Finnie, K.S.; Short, K.; Bartlett, J.R.; Woolfrey, J.L.; Collins, G.A.

    2005-01-01

    Sol-gel bonds have been produced between smooth, clean silicon substrates by spin-coating solutions containing partially hydrolysed silicon alkoxides. The two coated substrates were assembled and the resulting sandwich fired at temperatures ranging from 60 to 600 deg. C. The sol-gel coatings were characterised using attenuated total reflectance Fourier transform infrared spectroscopy, ellipsometry, and atomic force microscopy, while the corresponding bonded specimens were investigated using scanning electron microscopy and cross-sectional transmission electron microscopy. Mechanical properties were characterised using both microindentation and tensile testing. Bonding of silicon wafers has been successfully achieved at temperatures as low as 60 deg. C. At 300 deg. C, the interfacial fracture energy was 1.55 J/m 2 . At 600 deg. C, sol-gel bonding provided superior interfacial fracture energy over classical hydrophilic bonding (3.4 J/m 2 vs. 1.5 J/m 2 ). The increase in the interfacial fracture energy is related to the increase in film density due to the sintering of the sol-gel interface with increasing temperature. The superior interfacial fracture energy obtained by sol-gel bonding at low temperature is due to the formation of an interfacial layer, which chemically bonds the two sol-gel coatings on each wafer. Application of a tensile stress on the resulting bond leads to fracture of the samples at the silicon/sol-gel interface

  11. Calcium Impact on Milk Gels Formation

    DEFF Research Database (Denmark)

    Koutina, Glykeria

    enriched dairy products. Calcium gels can be produced by addition of a calcium salt and heat treatment at temperatures higher than 70 oC for several minutes. The combination of heat treatment and calcium addition to milk with pH values between 6.6 and 5.6, will produce calcium milk gels with unique...... and dense gel structure and with little seperation of whey due to participation of calcium to the final gel structure. On the other hand, the combination of heat treatment and calcium addition to milk with pH values lower than 5.6 will still produce gel structures which are dominated by the decrease of p...... to be formed. In addition the low amount of micellar calcium caused a more compact gel structure with many protein aggregates. The results of this study highlighted the importance of calcium for the formation of acid, calcium and rennet gels. The content and the interactions of calcium with proteins during...

  12. Energy saving in the management of the BIMBO group distribution fleet; Ahorro de energia en la operacion de la flotilla de distribucion del grupo BIMBO

    Energy Technology Data Exchange (ETDEWEB)

    BIMBO Mexico

    2005-07-01

    In this work BIMBO demonstrates that in order to save energy it is necessary to invest in equipment, parts, research and people. This is why they got involved in the task of developing the projects of fuel cells participating with universities, associations, Secretaria de Energia, Comision Nacional de Ahorro de Energia (National Commission for Energy Saving) (CONAE) and the National Council for Science and Tecnologia (CONACYT), through financial supports with projects of mechanisms of clean development (Kyoto Protocol). For doing it they had to prove different types of fuels: biodiesel, hydrogen, alcohol and hybrids; for them to determine the most profitable and practical thus reducing the energy consumption. With the saving of fuels and lubricants in our vehicles, a greater yield in the company is obtained. [Spanish] En este trabajo BIMBO demuestra que para ahorrar energia hay que invertir en equipo, partes, investigacion y gente. Es por eso que se dieron a la tarea de desarrollar los proyectos de celdas de combustible, participando con universidades, asociaciones, la Secretaria de Energia, la Comision Nacional para el Ahorro de Energia (CONAE) y el Consejo Nacional para la Ciencia y Tecnologia (CONACYT), a traves de apoyos financieros con proyectos de mecanismos de desarrollo limpio (protocolo de Kyoto). Para ello tuvieron que probar diferentes tipos de combustibles: biodiesel, hidrogeno, alcohol e hibridos, para determinar los mas rentables y practicos y asi reducir el consumo de energia; con el ahorro de combustibles y lubricantes en nuestros vehiculos, logrando una mayor rentabilidad en la empresa.

  13. Application of melanin-free ink as a new antioxidative gel enhancer in sardine surimi gel.

    Science.gov (United States)

    Vate, Naveen Kumar; Benjakul, Soottawat; Agustini, Tri Winarni

    2015-08-30

    The squid ink that is discarded as waste during processing can be effectively utilised as a gel enhancer in surimi gels, especially those prepared from dark-fleshed fish which have poor gel properties. It also acts as an antioxidant, inhibiting lipid oxidation. This investigation aimed to study the effect of melanin-free ink (MFI) from splendid squid (Loligo formosana) on properties and oxidative stability of surimi gel from sardine (Sardinella albella). MFI (0-0.1 g kg(-1) surimi) increased the breaking force and deformation of sardine surimi gel in a dose-dependent manner (P 0.05). The expressible moisture content of gels decreased as the levels of MFI increased (P < 0.05). Based on a microstructure study, gel added with MFI at a level of 0.08 g kg(-1) surimi was denser and finer than that of the control (without MFI). Surimi gels with MFI had lower peroxide values, thiobarbituric acid reactive substances, nonanal and 2-decenal. MFI could improve the properties of sardine surimi gel. Additionally, it was able to prevent lipid oxidation in surimi gels during refrigerated storage. © 2014 Society of Chemical Industry.

  14. Simple and practical staining of DNA with GelRed in agarose gel electrophoresis.

    Science.gov (United States)

    Huang, Qing; Baum, Larry; Fu, Wei-Ling

    2010-01-01

    Although SYBR Gold or SYBR Green I have been used in the loading buffer as a DNA stain safer than ethidium bromide for agarose gel electrophoresis, electrophoretic mobility of DNA is altered and thus DNA fragment size cannot be accurately determined. A method using GelRed in the loading buffer was developed to stain DNA fragments in agarose gel electrophoresis. Among various concentrations of GelRed, SYBR Gold, or SYBR Green I tested in the loading buffer, only the highest tested concentration of GelRed, i.e., 100x GelRed, did not change band mobility. Evaluations using various sizes of PCR products at different concentrations further confirmed that 100x GelRed could be used to accurately determine DNA fragment size. The reagent can be stored at 4 degrees C for at least 1 year without a decrease in staining sensitivity. The 100x GelRed is a sensitive and safe alternative to ethidium bromide and better than either SYBR Gold or SYBR Green I for size determination in agarose gel electrophoresis. Our laboratory now uses the GelRed method routinely with great consistency and success.

  15. Pulsed field gel electrophoresis a practical guide

    CERN Document Server

    Birren, Bruce

    1993-01-01

    Pulsed Field Gel Electrophoresis: A Practical Guide is the first laboratory manual to describe the theory and practice of this technique. Based on the authors' experience developing pulsed field gel instruments and teaching procedures, this book provides everything a researcher or student needs to know in order to understand and carry out pulsed field gel experiments. Clear, well-tested protocols assume only that users have a basic familiarity with molecular biology. Thorough coverage of useful data, theory, and applications ensures that this book is also a lasting resource for more adv

  16. Exopolysaccharide influence on acid gel formation

    Directory of Open Access Journals (Sweden)

    K. Yoanidu

    2017-06-01

    Full Text Available Abstract. Turbidimetric monitoring of milk coagulation was conducted in situ. Milk gel was produced by acidification with the use of three strains of starter culture. These strains were characterized by various acidification rate and exopolysaccharides (EPS production. The concentrations of EPS affect mostly the pH of gel formation (5.53 - low EPS – producing strain; 5.33 - medium EPS – producing strain; 5.46 - high EPS – producing strain whereas the time of gel formation depends on the various rate of acidification of all three strains.

  17. Analysis of passive systems as a tool for energy saving in buildings: solar control; Analisis de sistemas pasivos como herramienta para el ahorro de energia en edificaciones: Control solar

    Energy Technology Data Exchange (ETDEWEB)

    Saravia, Maricela; Morillon Galvez, David [Instituto de Ingenieria, UNAM, Mexico, D. F. (Mexico)

    1999-07-01

    A bioclimatic study of El Salvador is presented, with the purpose of using window eaves as elements of passive solar control and to determine the optimal angles of orientation, in order to diminish the thermal gains by direct solar radiation and to manage to get close to the comfort conditions. The former with the intention of integrating measures that help to obtain energy efficiency and comfortable buildings, for the conditions of warm humid climate, characteristic of a Central American country like El Salvador. Besides offering a document of consultation among the professionals dedicated to the design and as base of bioclimatic considerations that must have the construction regulations. As a conclusion the optimal angles of eaves for each orientation are presented and a quantitative estimation of the savings that would imply not to consume electrical energy in cooling systems using these elements as a protection to the direct solar radiation. [Spanish] Se presenta un estudio del bioclima de El Salvador, con el fin de utilizar aleros de ventana como elementos de control solar pasivo y determinar los angulos optimos por orientacion, para disminuir las ganancias termicas por radiacion solar directa y lograr acercar a las condiciones de confort. Lo anterior con el objeto de integrar medidas que coadyuven a lograr edificios energeticamente eficientes y confortables, para las condiciones de clima calido humedo, caracteristico de un pais centroamericano como El Salvador. Ademas de brindar un documento de consulta entre los profesionales dedicados al dise y como base de consideraciones bioclimaticas que debe tener el reglamento de construcciones. Como conclusion se presentan los angulos optimos de alero por cada orientacion y una estimacion cuantitativa del ahorro que implicaria el no consumir energia electrica en sistemas de enfriamiento utilizando estos elementos como una proteccion a la radiacion solar directa.

  18. Lógica Fuzzy aplicada ao controle de um sistema híbrido de geração de energia elétrica: eólica, fotovoltaica e biogás

    OpenAIRE

    Reis, Luiz Octávio Mattos dos [UNESP

    2002-01-01

    Este trabalho desenvolve o estudo de um sistema híbrido para geração de energia elétrica a ser aplicado em pequenas comunidades rurais não servidas pelo serviço de eletrificação rural. Fatores geográficos e econômicos, em muitos casos, impossibilitam as empresas de energia em construírem sistemas de distribuição rurais. Mas estas pequenas comunidades rurais desenvolvem uma micro-economia, necessitando de energia elétrica. O sistema proposto produz energia a partir de fontes alternativas utili...

  19. MODELAGEM DE PROCESSOS UTILIZANDO O BPMN NA FACULDADE CATÓLICA RAINHA DO SERTÃO

    Directory of Open Access Journals (Sweden)

    Antonio Neuton da Silva Júnior

    2014-06-01

    Full Text Available O presente artigo apresenta o gerenciamento de negócios por processos, suas perspectivas atuais, suas vantagens, o desenvolvimento do projeto Modelagem de Processos utilizando BPMN implementado na Faculdade Católica Rainha do Sertão, as ferramentas utilizadas no projeto, a metodologia e os resultados obtidos a partir do mesmo. Ainda foi descrito os setores utilizados, a modelagem resultante das pesquisas e entrevistas e as sugestões para as melhorias dos processos modelados.

  20. Buckling of paramagnetic chains in soft gels.

    Science.gov (United States)

    Huang, Shilin; Pessot, Giorgio; Cremer, Peet; Weeber, Rudolf; Holm, Christian; Nowak, Johannes; Odenbach, Stefan; Menzel, Andreas M; Auernhammer, Günter K

    2016-01-07

    We study the magneto-elastic coupling behavior of paramagnetic chains in soft polymer gels exposed to external magnetic fields. To this end, a laser scanning confocal microscope is used to observe the morphology of the paramagnetic chains together with the deformation field of the surrounding gel network. The paramagnetic chains in soft polymer gels show rich morphological shape changes under oblique magnetic fields, in particular a pronounced buckling deformation. The details of the resulting morphological shapes depend on the length of the chain, the strength of the external magnetic field, and the modulus of the gel. Based on the observation that the magnetic chains are strongly coupled to the surrounding polymer network, a simplified model is developed to describe their buckling behavior. A coarse-grained molecular dynamics simulation model featuring an increased matrix stiffness on the surfaces of the particles leads to morphologies in agreement with the experimentally observed buckling effects.

  1. Evaluation of wheat by polyacrylamide gel electrophoresis

    African Journals Online (AJOL)

    PRECIOUS

    2010-01-11

    04, Inqulab-91 and Rawal-. 87 were evaluated for analysis of variability in seed storage proteins by using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Electrophorogram for each variety were scored ...

  2. Sodium Dedecyl Suphate Polyacrilamide Gel Electrophosis of ...

    African Journals Online (AJOL)

    polyacrilamide gel electrophoresis (SDS-PAGE). The isolates were obtained from the faeces of diarrhoeic children with the age range of 0 t 36 months attending paediatric clinic at the Lagos University Teaching Hospital (LUTH) and Obafemi Awolowo ...

  3. Preparation of zirconium molybdate gel generator

    International Nuclear Information System (INIS)

    Charoen, S.; Aungurarat, G.; Laohawilai, S.; Sukontpradit, W.; Jingjit, S.

    1994-01-01

    A procedure for preparation of 99mTc generator based on conversion to zirconium molybdate gel of 99Mo produced by neutron activation was reported. The gel was prepared from zirconium oxychloride solution pH 1.6, ammonium molybdate solution pH 3-5 and mole ratio of Zr:Mo 1:1 which had water content about 7-8%. Small generators containing 1-1.5 g of gel were eluted with average efficiencies of 77% and the activity peak in the first 3 ml of 10 ml of saline solution. The amount of Mo and Zr in eluates were below the acceptance limit. The gel generators of activity about 100 mCi were prepared and had the good performance in elutability and stability

  4. Thixotropic corrosive gels for nuclear decontamination

    International Nuclear Information System (INIS)

    Bargues, St.

    1998-01-01

    The aim of this thesis was the development of corrosive gels for metallic surface decontamination. These gels formulation, based on a powerful oxidant (the cerium IV), the nitric acid, a mineral charge (silica) and a non ionic surface-active, has been developed according to the specific constraints of the nuclear industry. The objective was to prepare thixotropic gels becoming liquid after shacking to allow an easy pulverization and coming again solid to permit a perfect adhesion on the metallic surface. This rheological study of the gels has been completed by an evaluation of their corrosive properties. The last part of the work presents an industrial utilization during two years. (A.L.B.)

  5. Desenvolvimento de um kit de irrigação por microtubos com moto-bomba propulsionada por energia solar

    OpenAIRE

    Luiz Ricardo Sobenko

    2016-01-01

    O bombeamento de água por meio da energia solar vem se mostrando uma alternativa para localidades onde outras fontes de energia não estão disponíveis ou são limitadas. Torna-se interessante aliar essa alternativa a um sistema de irrigação que opera com vazão e pressão relativamente baixas, como a irrigação localizada por microtubos, possibilitando assim a obtenção de alta eficiência. No presente trabalho teve-se por objetivo dimensionar e avaliar um kit de irrigação por microtubos, alimentado...

  6. A influência da Naturphilosophie nas ciências do século XIX: eletromagnetismo e energia

    Directory of Open Access Journals (Sweden)

    Ana Paula Bispo Silva

    Full Text Available Resumo Os fenômenos envolvendo eletromagnetismo e conservação da energia durante o século XIX não se enquadravam no paradigma newtoniano vigente. Havia entre os estudiosos a necessidade de explicar tais fatos considerando-se "algo mais", não expresso até então. É nessa explicação que a Naturphilosophie, programa filosófico associado ao movimento romântico alemão do século XIX, parece oferecer novos caminhos para entender as ciências. Neste artigo, trazemos os principais aspectos da obra de Schelling, principal expoente da Naturphilosophie, e como seus pressupostos foram inseridos nas ciências físicas para explicar o eletromagnetismo e a conservação da energia.

  7. Niveis de energia digestível na ração de girinos de rã-touro

    OpenAIRE

    Albinati, Ricardo Castelo Branco; Lima, S. L.; Donzele, J. L.

    2001-01-01

    p. 48-52 Foi realizado um experimento para verificar os efeitos dos níveis de energia digestível na ração para girinos de rã-touro (Rana catesbeiana, Shaw, 1802) sobre o desenvolvimento e composição da carcaça dos animais. Foram testados seis níveis de energia digestível (ED): 3.627, 3.693, 3.758, 3.823, 3.889 e 3.954 kcal/kg, em uma ração com 38,6% de Proteína Bruta (PB). Não houve diferença (P > 0,05) entre os tratamentos, para consumo de ração, ganho de peso, co...

  8. INVESTIGAÇÃO EXPERIMENTAL DA GERAÇÃO DE ENERGIA ELÉTRICA SOLAR FOTOVOLTÁICA

    Directory of Open Access Journals (Sweden)

    Antonio Luiz P. S. Campos

    2010-09-01

    Full Text Available Os painéis solares fotovoltaicos são dispositivos desenvolvidos para a geração de energia elétrica. Este trabalho aborda conceitos envolvidos na fabricação e funcionamento desses dispositivos tais como: histórico da energia solar fotovoltaica, tipos de painéis solares e aplicação de painéis solares em sistemas isolados. Foi feito um estudo de eficiência de geração elétrica de um painel solar existente no Campus Natal – Zona Norte do IFRN. Nesse estudo, foram levadas em consideração a incidência solar e a hora do dia. Por fim, são apresentadas conclusões sobre o estudo desenvolvido.

  9. Electric power generation from biogas coming from sewer treatment using a 18 kW generator group; Geracao de energia eletrica a partir do biogas proveniente do tratamento de esgoto utilizando um grupo gerador de 18 kW

    Energy Technology Data Exchange (ETDEWEB)

    Coelho, Suani Teixeira; Velazquez, Silvia Maria Stortini Gonzalez; Silva, Orlando Cristiano da; Abreu, Fernando Castro de [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia. Centro Nacional de Referencia em Biomassa]. E-mail: suani@iee.usp.br; sgvelaz@iee.usp.br; gbntumbo@iee.usp.br; fcabreu@iee.usp.br

    2006-07-01

    The main objective of the effluent treatment is to correct its undesirable characteristics, however, during this process, residues like sludge and biogas are generated, and those residues can be used as raw materials. The PUREFA (Program of Rational Energy Use and Alternative Sources), compound by 14 purposes, is about a project of the USP - University of Sao Paulo, financial backer FINEP - Financier of Studies and Projects. This project had three main objectives: to implant measures of management and action of energy efficiency, to increase the distributed generation in the USP from the renewable resource and not conventional energy and to introduce incentive permanent politics to the efficient and rational use of energy. In the context, the Brazilian Reference Center on Biomass was responsible for two purposes, related to the biogas use for electricity generation. The first purpose had main objective to implant the generation system, to capture and to stock the biogas, produced by biodigestor in the Technological Hydraulically Center (CTH - USP). The biodigestor is a UASB (Upflow Anaerobic Sludge Blanket), whose outflow of the biogas produce is near 4 m{sup 3}/day, opera rates 24 hours per day and utilize the sewer from the residential buildings located in Sao Paulo University, inside the campus. For the biogas utilization, was made its outflow, chemical composition and heat value identifications, parameters that allowed to determinate the real potential for generation and to shown the necessity of the previous treatment, as H2S removal. Finished this stage, was started the next purpose, regarding biogas used as fuel for electricity generation using a generator group Otto cycle. Nowadays this project is a demonstrative project. In this article the technical and environmental project results obtained will be presented. (author)

  10. Disinfection of effluent of wastewater treated using solar energy (SODIS): evaluation of a solar concentrator device; Desinfeccao de efluentes com tratamento terciario utilizando energia solar (SODIS): avaliacao do uso do dispositivo para concentracao dos raios solares

    Energy Technology Data Exchange (ETDEWEB)

    Paterniani, Jose Euclides Stipp; Silva, Marcelo Jacomini Moreira da [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Engenharia Mecanica. Saneamento e Ambiente]. E-mail: pater@agr.unicamp.br

    2005-01-15

    Besides being an available natural resource, the solar energy is very applicable in places with few recourses and low money resources, because there aren't either the need of chemical products neither a huge cost (commercial materials can be reused). To make this job we re-used PET bottles half painted black with the variables: 1, 2, 4 and 6 hours of heat exposition and we also used a concentrator of rays of sunshine. The affluent control parameters were turbidity, apparent color, temperature, total coliforms and E. coli. These last three were evaluated before and after the disinfection process (effluent parameters). To assess the bacteria reactivation we kept the water in bottles for 24 hours, pretending a very common situation in Brazilian rural houses. We conclude that the use of the concentrator of rays of sunshine can reduce the heat exposition from 6 to 4 hours, without harm the SODIS efficiency. Using the concentrator of rays of sunshine for 6 hours we can obtain, besides SODIS, the process of solar pasteurization (SOPAS), which stops the re-growth of bacteria with a 70 deg C water temperature. We also observed that when the sky is cloudy the incidence of solar radiation and, therefore, the SODIS efficiency decrease, even if the water temperature is higher during the disinfection. Although, this factor doesn't mean a significant influence statistically. (author)

  11. Use of sewage treatment biogas for electric generation using an 30 kW (ISO); Uso do biogas de tratamento de esgoto, para geracao de energia eletrica, utilizando-se de uma microturbina de 30 kW (ISO)

    Energy Technology Data Exchange (ETDEWEB)

    Coelho, Suani T.; Velazquez, Silvia M.S.G.; Martins, Osvaldo S.; Costa, David F. [Centro Nacional de Referencia em Biomassa (CENBIO), Sao Paulo, SP (Brazil); Bacic, Antonio C.K. [Companhia de Saneamento Basico do Estado de Sao Paulo (SABESP), SP (Brazil)

    2004-07-01

    This paper intends to present some considerations directed to electricity generation with 30 kW (ISO) micro turbines, using biogas generated by sewage treatment process in SABESP (Basic Sanitation Company of Sao Paulo State), located at Barueri, Brazil. This project, pioneer in Latin America, is being accomplished together with BUN - Biomass Users Network of Brazil (proponent), in association with CENBIO - The Brazilian Reference Center on Biomass (executer), with patronage of FINEP / CT-ENERG (financial backer), by means of ACCORD No: 23.01.0653.00, regarding to ENERG-BIOG Project - 'Installation and Tests of an Electric Energy Generation Demonstration Unit from Biogas Sewage Treatment'. Thus, the contribution of this paper will be in the presentation of the project results, related with the exploitation of sewer biogas for power generation, as well as bigger details about purification, compression and electricity generation systems (biogas micro turbine) used in the installation. (author)

  12. Protection against corrosion in metallic tower foundations by using the energy induced by the electric field of the transmission line; Protecao contra corrosao nas fundacoes das torres metalicas, utilizando energia induzida pelo campo eletrico da linha de transmissao

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, Joao Nelson [Companhia Paranaense de Energia (COPEL), Curitiba, PR (Brazil)]. E-mail: hoffmann@copel.com; Silva, Jose Maurilio da [LACTEC - Instituto de Tecnologia para o Desenvolvimento, Curitiba, PR (Brazil)]. E-mail: maurilio@lactec.org.br

    2005-04-15

    This paper presents an usual method for protection against corrosion on grillage foundations widely used in electric power transmission line towers. This method uses as energy source for the cathodic protection, the electric current generated by the induction of the transmission line herself.

  13. Comparative analysis of the cost of application for a blade of irrigation using electric energy and diesel; Analise comparativa do custo para aplicacao de uma lamina de irrigacao utilizando energia eletrica e diesel

    Energy Technology Data Exchange (ETDEWEB)

    Sa Junior, Arionaldo; Carvalho, Jacinto de Assuncao; Oliveria, Eduardo Carvalho de [Universidade Federal de Lavras (DEG/UFLA), MG (Brazil). Dept. de Engenharia], email: arionaldojr@hotmail.com

    2011-07-01

    The aim of this study was to estimate the cost of electric and diesel power for the application of 1 mm of irrigation in an area of 1 hectare. The Tariff Group considered was 'B' for low voltage and subgroup 'B2 Rural'. The fares used were obtained from CEMIG, being of R$ 0.22019. The diesel value adopted was the month of November 2010 in the southern region of Minas Gerais, comprising $ 1.97 L{sup -1}. For purposes of calculation, the total income of the height manometric were taken, respectively, 60%, 65%, 70%, 75% and 10, 25, 75, 100, 125, 150, 175 and 200 mca. To calculate the total cost with the application of the depth of 1mm was considered that the cost of energy accounts for 65% and 75% for electric and diesel, respectively. The results show a increase in energy costs by increasing the total head. The use of systems more efficient pump reduces the cost of electric power in the order of 6.7% to 20% and diesel from 3.6% to 16.2% for the proposed situations. In all cases the electric power is more appropriate with regard to cost. The relationship between electricity and diesel is 51.62% and 15.98% for better and worse, respectively. (author)

  14. Evaluation of IMRT plans for prostate treatment using energies of 6 MV and 15 MV; Avaliacao de planejamentos de IMRT para tratamento de prostata utilizando energias de 6 MV e 15 MV

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Lucas Francisco C.; Silva, Murilo C. da; Silveira, Paula J.; Flosi, Adriana A.; Boccaletti, Karina W., E-mail: mcollete@gmail.com [A. C. Camargo Cancer Center, Sao Paulo, SP (Brazil). Servico de Radioterapia

    2013-08-15

    This study aims to evaluate and compare radiotherapy plans with intensity-modulated radiation therapy (IMRT) for prostate cancer treatments optimized for photon energies of 6 MV and 15 MV. We retrospectively evaluated 29 patients with prostate cancer, planned with IMRT technique with prescribed dose of 78 Gy. The initial plan was done for the two photon energies, keeping the same optimization parameters and comparing maximum, minimum and modal PTV doses, conformity and homogeneity indexes, dose gradients, isodoses volumes of 30, 40, 50, 60, and 70 Gy, and the total number of monitor units. It was found that the plans are equivalent regarding higher isodose volumes, conformity and homogeneity indexes, maximum, minimum and modal PTV doses. However, for 6 MV plans there was a considerable increase in both number of monitor units and volume lower isodose volumes, especially the 30 Gy. (author)

  15. Quantitative analysis of geological samples using energy dispersive x-ray fluorescence; Analise quantitativa de amostras geologicas utilizando a tecnica de fluorescencia de raios-x por dispersao de energia

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro, A.E.V. [Universidade Metodista de Piracicaba (UNIMEP), SP (Brazil). Dept. of Physics; Nascimento Filho, V.F. [Sao Paulo Univ., Piracicaba, SP (Brazil). Escola Superior de Agricultura Luiz de Queiroz]|[Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, SP (Brazil)

    1996-01-01

    A quantitative analytical methodology is proposed for geological samples presenting a high fraction of light elements (atomic number less than 130), using the energy dispersive X-ray fluorescence technique with radioisotopic excitation. The proposed procedure is based on the method of the fundamental parameters for analytical element (Z{<=} 13) evaluation, and coherent and incoherent scattered radiation for the quantitation of the light fraction of the matrix. In this method, standard samples made of pure elements and simple compounds of previously known and superficial density were used to estimate the relationship between the fluorescence intensity and the element concentration through elemental sensitivity and geometric factor for fluorescence. The relationship between scattered intensities and matrix light fraction was based on geometry and scattering factors as well as deferential cross sections. In order to obtain the characteristic x-rays of the elements in the Mn to Zr range a Cd Cd-109 annular radioactive source (1.70 GBq) was used, and for Al to Cr, Fe-55 (0.74 GBq). For the x-ray detection a Si(Li) detector coupled to a multichannel emulation card was employed. The characteristic x-ray net intensity as well as the coherent and incoherent scattered intensities were obtained by using the AXIL software for spectra analysis. To test the proposed procedure, six certified samples (soil-5 / AIEA, SL-2 / AIEA, SARM-2 / SABS, SARM-3 / SABS, SARM-4 / SABS and SARM-6 / SABS) were analyzed. The samples were diluted with boric acid in a 1:4 proportion to make pellets with superficial density of approximately 100 mg. cm{sup -2}. (author). 8 refs., 5 tabs.

  16. Implementation in graphic form of an observability algorithm in energy network using sparse vectors; Implementacao, em ambiente grafico, de um algoritmo de observabilidade em redes de energia utilizando vetores esparsos

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Claudio Eduardo Scriptori de

    1996-02-01

    In the Operating Center of Electrical Energy System has been every time more and more important the understanding of the difficulties related to the electrical power behavior. In order to have adequate operation of the system the state estimation process is very important. However before performing the system state estimation owe needs to know if the system is observable otherwise the estimation will no be possible. This work has a main objective, to develop a software that allows one to visualize the whole network in case that network is observable or the observable island of the entire network. As theoretical background the theories and algorithm using the triangular factorization of gain matrix as well as the concepts contained on factorization path developed by Bretas et alli were used. The algorithm developed by him was adapted to the Windows graphical form so that the numerical results of the network observability are shown in the computer screen in graphical form. This algorithm is essentially instead of numerical as the one based on the factorization of gain matrix only. To implement the algorithm previously referred it was used the Borland C++ compiler for windows version 4.0 due to the facilities for sources generation it presents. The results of the tests in the network with 6, 14 and 30 bus leads to: (1) the simplification of observability analysis, using sparse vectors and triangular factorization of the gain matrix; (2) the behavior similarity of the three testes systems with effective clues that the routine developed works well for any systems mainly for systems with bigger quantities of bus and lines; (3) the alternative way of presenting numerical results using the program developed here in graphical forms. (author)

  17. Estimation of electric power generation using coal from the fruit peel of cupuassu in Amazonas State, Brazil; Estimativa de geracao de energia eletrica utilizando o carvao da casca do fruto do cupuacuzeiro no estado do Amazonas

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Antonio Cleuder Lima da [Manaus Energia S/A., Manaus, AM (Brazil); Santos, Eyde Cristiane Saraiva dos [Universidade Federal do Amazonas (FCA/UFAM), Manaus, AM (Brazil). Faculdade de Ciencias Agrarias. Dept. de Engenharia Agricola e Solos], e-mail: eyde_cristianne@yahoo.com.br

    2008-07-01

    The application of the charcoal of agroforestry residue for the generation of electric energy, for being renewable power plant and possessing technology for application, comes being evidenced. In this research the potential of generation of electric energy was estimated, in the main producing cities of the State of Amazonas of the fruit of the cupuacuzeiro (Theobroma grandiflorum Wild. Ex. Spreng. Shum.), using the rind carbonized in technology of gasification, substitution of diesel. The charcoal of the rind of the fruit of the cupuacuzeiro presents to be able calorific next to the one to the deriving coal of the wood. Known the annual production of each one the cities, the amount and the cost of production of the generated electric energy, determined in this research, it justifies the exploitation of this residue, for having economic advantages, when comparative with the tariff of the adopted electric energy in the region for the concessionaire. (author)

  18. Analysis of the scenarios with the participation of nuclear energy in the Mexican electric sector using the Decades program; Analisis de escenarios con la participacion de la energia nuclear en el sector electrico mexicano utilizando el programa DECADES

    Energy Technology Data Exchange (ETDEWEB)

    Sosa P, E.; Trejo G, M.G.; Martin del Campo M, C.; Francois L, J.L. [FI-UNAM, 04500 Mexico D.F. (Mexico)] e-mail: edithsosa@hotmail.com

    2003-07-01

    At the moment the energetic planning demands a technical, economic and environmental analysis of the different options of electric generation to be able to find the best solution of supply and energy readiness, already that it is indispensable for the development of the productive activities and to assure the competitiveness of the economy of a country. The expansion analyses of the Mexican Electric Sector its are carried out daily in the Federal Commission of Electricity (CFE) with some programs, among them Decades. However, up to where we have information only there is been considering a type of reactor like candidate being that exist several options that show promising characteristics for what its should be considered in the analyses. With this work its got rich the Decades database of the nuclear power stations that can be used as candidates to consider in the variable system of the expansion studies. Its have been carried out some comparative analysis between two types of nuclear centrals that at the moment offer in the market, specifically the AP600 type PWR reactor of 600 M We and the one BWR with capacity of 1300 M We. Later on it is sought to analyze two or three scenarios of the system of electric generation in Mexico to a term of twenty or twenty-five years. (Author)

  19. Model of spatial analysis of electric power market using the Fuzzy C-Means technical classification; Modelo de analise espacial de mercado de energia eletrica utilizando a tecnica de classificacao Fuzzy C-Means

    Energy Technology Data Exchange (ETDEWEB)

    Neto, J.C. [Companhia Energetica de Goias (CELG-D), Goiania, GO (Brazil)], E-mail: joao.cn@celg.com.br; Lima, W.S. [Votorantim Siderurgia, Resende, Rio de Janeiro, RJ (Brazil). Gerencia Geral de Tecnologia], E-mail: wagner.lima@vmetais.com.br

    2009-07-01

    The power distribution companies live with an antagonistic reality: an increasing energy demand, due to steady economic and population growth, and a limitation on their financial resources to expand its network. Therefore, it is essential an improvement in activity of planning of the power distribution system trying to improve the application of available resources. In this context fits the application of Geographic Information System combined with clustering techniques and classification in order to enhance the planning process, giving the planner a more complete picture of the consumer market by the distributor. This paper presents a system that makes use of Geographic Information System combined with the technique of clustering and classification Fuzzy C-Means, with the aim of analyzing the distribution of network load and the performance of the technique. Each group performed leads to a spatial representation (scenario). This, together with an index measuring the performance of the group (intra-group and inter-group) implemented in this work, provides a favorable environment for spatial analysis of the electric power market.

  20. Solving optimization problems using hybrid architecture: a strategy for planning the electric power generation; Solucao de problemas de otimizacao utilizando arquitetura hibrida: uma estrategia para o planejamento da geracao de energia eletrica

    Energy Technology Data Exchange (ETDEWEB)

    Murakami, L.T. [Lechare Informatica Ltda., Sao Paulo, SP (Brazil)

    2009-07-01

    Electrical power could be considered as one of the economy propulsion vector of a country, assuming extremely important and strategic role because it makes direct influence to the production capacity. The expansion of electrical energy production could not only be done in a short time because constructions in this area take many years and could require more then a decade depending on the magnitude of them. The national power generation group is constituted mainly by hydro power plants complemented by thermal power plants which use several kinds of fuel which generation cost is high, if compared to hydro power generation, and should be minimized. It is a complex planning issue to supply the future power demand which basically depends on the analysis of two compoundable scenarios: the first one refers to the forecast of future economy growing and in this case, unless unpredictable issues occur such as the recent high economy growing experimented by China, the future demand does not show any surprise and is easy to predict; the second one, has inside the uncertainty because the hydro plants productions depends on the water quantity of rivers which depends on the past and current rainfall regimen. The quantity of rainfall is a stochastic data and follows the rules of probability and this drives to the study of cases and its deployments which are numerous causing difficulties to forecast the future. The planning of the electrical area has to examine the future demand and provide the necessary power generation equipment assuming a certain risk. To have it done, simulation models are used to predict the future, combining the two scenarios cited before, and viewing the results promoted by decision took in a step before. The difficult of this task is caused by the big amount of future alternatives provided by the combinatorial phenomena which require, to process the model, a computer with high processing capacity and specialized and specific methods that can resolve this king of problem. Because of the importance and magnitude of this issue, every effort which contributes to the improvement of power planning is welcome and this corroborates with this thesis which has an objective to propose technical, viable and economic solutions to solve the optimization problems with a new approach and has potential to be applied in many others kind of similar problems.

  1. A hydrothermal economic dispatch model for the energy markets using the interior point method; Um modelo de despacho economico hidrotermico para os mercados de energia utilizando o metodo de pontos interiores

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Leandro L.H.; Silva, Alessandro L. da; Vergilio, Andre H.B.; Nepomuceno, Leonardo [Universidade Estadual Paulista (UNESP), Bauru, SP (Brazil). Dept. de Engenharia Eletrica], Emails: leandroluiz@ymail.com, alessandrolopessilva@uol.com.br, andrevergilio@yahoo.com.br, leo@feb.unesp.br; Cicogna, Marcelo Augusto [Anhanguera Educacional S.A. (Brazil)], E-mail: marcelo.cicogna@unianhanguera.edu.br,

    2009-07-01

    This paper aims to propose a model of economic dispatch for the problem representation of the auction in pool markets for systems with generation predominantly hydraulic. In the dispatch models described in the literature, only the agents of thermal generation participate in the auction pool. This is due to the fact that it have not been proposed in the literature yet a suitable model for representation of the cost structure of hydraulic generators. In this work is proposed the function of opportunity cost of hydrogeneration, which establishes a framework of 'cost' of hydraulic generation, based on losses in the process of hydroelectric generation. It is also studied the feasibility that both agents on the hydraulic and thermal generators can bidding in the pool. The approach to solving the problem involves the method of primal-dual logarithmic barrier. The results show that using the function of opportunity cost for hydroelectric plants is important for the system energy optimization as a whole, but its use for the representation of the bids of the hydraulic agents still needs further deepening search.

  2. Detection of pectinesterase in polyacrylamide gels.

    Science.gov (United States)

    Alonso, J; Rodríguez, M T; Canet, W

    1995-01-01

    A rapid and sensitive method of detecting pectinesterase activity following electrophoresis or isoelectric focusing in polyacrylamide gels is described. The method uses ruthenium red and requires no addition of substrate when making the gels, thus obviating direct enzyme-substrate contact during electrophoresis. Because of its versatility, the method can be used in a wide variety of applications, such as plant and microbial taxonomy, enzyme purification and characterization, or as an analytical method in fresh and processed plant technology.

  3. Improving calibration accuracy in gel dosimetry

    International Nuclear Information System (INIS)

    Oldham, M.; McJury, M.; Webb, S.; Baustert, I.B.; Leach, M.O.

    1998-01-01

    A new method of calibrating gel dosimeters (applicable to both Fricke and polyacrylamide gels) is presented which has intrinsically higher accuracy than current methods, and requires less gel. Two test-tubes of gel (inner diameter 2.5 cm, length 20 cm) are irradiated separately with a 10x10cm 2 field end-on in a water bath, such that the characteristic depth-dose curve is recorded in the gel. The calibration is then determined by fitting the depth-dose measured in water, against the measured change in relaxivity with depth in the gel. Increased accuracy is achieved in this simple depth-dose geometry by averaging the relaxivity at each depth. A large number of calibration data points, each with relatively high accuracy, are obtained. Calibration data over the full range of dose (1.6-10 Gy) is obtained by irradiating one test-tube to 10 Gy at dose maximum (D max ), and the other to 4.5 Gy at D max . The new calibration method is compared with a 'standard method' where five identical test-tubes of gel were irradiated to different known doses between 2 and 10 Gy. The percentage uncertainties in the slope and intercept of the calibration fit are found to be lower with the new method by a factor of about 4 and 10 respectively, when compared with the standard method and with published values. The gel was found to respond linearly within the error bars up to doses of 7 Gy, with a slope of 0.233±0.001 s -1 Gy -1 and an intercept of 1.106±0.005 Gy. For higher doses, nonlinear behaviour was observed. (author)

  4. Conducting Polymer Electrodes for Gel Electrophoresis

    OpenAIRE

    Bengtsson, Katarina; Nilsson, Sara; Robinson, Nathaniel D

    2014-01-01

    In nearly all cases, electrophoresis in gels is driven via the electrolysis of water at the electrodes, where the process consumes water and produces electrochemical by-products. We have previously demonstrated that p-conjugated polymers such as poly(3,4-ethylenedioxythiophene) (PEDOT) can be placed between traditional metal electrodes and an electrolyte to mitigate electrolysis in liquid (capillary electroosmosis/electrophoresis) systems. In this report, we extend our previous result to gel ...

  5. On-line diagnosis of high power motors based on ultra wide band partial discharge detection; Diagnostico en linea de motores de gran capacidad mediante la deteccion de descargas parciales utilizando tecnicas de banda ultra ancha

    Energy Technology Data Exchange (ETDEWEB)

    Carvajal M, F. Antonio; Garcia Colon H, Vicente R. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Asiain, Tomas [Instituto Politecnico Nacional, Escuela Superior de Ingenieria Mecanica y Electrica (Mexico)

    2009-07-01

    In this work a non-standardized method for on-line diagnostic of high capacity motors based on Ultra Wide Band (UWB) Partial Discharge (PD) measuring techniques is theoretically supported, implemented and applied. The method developed is non invasive and consist in the measurement of PD in the main motor power supply cables and its ground shields connection using a near field sensor (Rogowski coil, clamp-on type) with a bandwidth of 2 to 40 MHz. The measured signals by the sensor, are stretched electronically, digitized and fed to a conventional Partial Discharge digital detector. The UWB PD detection system used displays the output in a Pulse repetition frequency-Charge-Phase angle (N-Q-?) PD pattern. The results obtained in thirteen 2500 H.P., 13.8 kV motors performed during operating in an Oil Pumping facility are presented, including its analysis and comparison with values and PD patterns reported in literature. [Spanish] En este trabajo se presentan los fundamentos teoricos, la implementacion y aplicacion de un metodo no normalizado, para el diagnostico en linea de motores de gran capacidad, basado en la deteccion de Descargas Parciales (DP) utilizando tecnicas de medicion de Banda Ultra Ancha. El metodo desarrollado es no invasivo y consiste en la medicion de las DP en los conductores y conexiones a tierra de la pantalla de los cables principales de suministro de energia al motor, utilizando un sensor de campo cercano (bobina Rogowski, tipo gancho) cuyo ancho de banda de medicion es de 2 a 40 MHz. Las senales medidas por el sensor son electronicamente procesadas para ampliar su duracion, digitalizadas y enviadas a un detector digital de Descargas Parciales convencional. El sistema de deteccion de DP en Banda Ultra Ancha despliega la medicion en un patron de DP tipo frecuencia de repeticion de Pulso-Carga-Angulo de fase (N-Q-?). Se presentan los resultados obtenidos de la evaluacion en linea de trece motores de 2500 C.P. a 13.8 kV, instalados y operando en una

  6. Fertigação em mudas de citros utilizando-se mangueiras e microtubos sob regime de escoamento turbulento Fertigation on citrus seedlings using hoses and microtubes under turbulent flow regime

    Directory of Open Access Journals (Sweden)

    Wanderley J. Souza

    2011-08-01

    Full Text Available A irrigação localizada utilizando-se microtubo como emissor operando em regime de escoamento turbulento, pode ser uma alternativa viável, tanto técnica como economicamente para a produção de mudas de citros. Objetivou-se, com este trabalho, avaliar o desempenho de um sistema de fertigação na produção de mudas de laranja em viveiro projetado pelo modelo matemático universal, utilizando-se microtubos como emissores, sob regime de escoamento turbulento e comparar o desenvolvimento das plantas fertigadas por microtubos com o sistema em que se utiliza o método tradicional com mangueiras. No dimensionamento do comprimento dos emissores considerou-se o coeficiente K de dissipação de energia localizada através de um microtubo com diâmetro interno de 0,761 mm. O sistema de fertigação apresentou bom desempenho, com valores de grau de entupimento, uniformidade de Christiansen e uniformidade de emissão iguais a 0,50; 99,95 e 98,21%, respectivamente, após 160 dias de estudo. As plantas cultivadas via fertigação com microtubos e mangueiras, não apresentaram diferenças no que se refere ao diâmetro do caule e à altura. Desta forma, o uso de microtubo sob escoamento turbulento apresentou viabilidade técnica para fertigação.The use of localized irrigation using microtube as emitter under turbulent flow regime can be a technically feasible alternative. The objective of this study was to evaluate the performance of a fertigation system in nursery of citrus plants (greenhouse projected by universal mathematical model, using the microtubes as emitters, under turbulent flow rate and to compare the development of the fertigated plants by microtubes to the system that use the traditional method with hoses. In the size of the length of the emitters was considered the K coefficient of localized energy dissipation using a microtube with internal diameter of 0,761 mm. The fertigation system presented great performance with clogging degree

  7. Cumulative irritation comparison of adapalene gel and solution with 2 tazarotene gels and 3 tretinoin formulations.

    Science.gov (United States)

    Greenspan, Alan; Loesche, Christian; Vendetti, Nancy; Georgeian, Kathleen; Gilbert, Richard; Poncet, Michel; Baker, Michael D; Soto, Pascale

    2003-07-01

    Forty-two subjects with normal skin were enrolled in a single-center study to assess the cumulative irritancy potential of adapalene (Differin gel 0.1% and Differin solution 0.1%) compared with tazarotene (Tazorac gels 0.05% and 0.1%), tretinoin (Retin-A Micro gel 0.1%, Avita cream 0.025%, and Avita gel 0.025%), and white petrolatum (negative control). All test materials were applied randomly, under occlusion, to sites located on either side of the midline--the mid thoracic area of the subjects' backs. All patches were applied daily, Monday through Friday, to the same sites, unless the degree of reaction to a test product or adhesive necessitated removal (grade 3). Thirty-eight of the 42 subjects (90.5%) completed the study. Thirty-four of those 38 subjects (89.5%) had to discontinue using both tazarotene concentrations due to intolerance. Patch discontinuations for the remaining test materials were as follows: 7 subjects discontinued use of tretinoin microsphere gel 0.1%, 3 discontinued tretinoin cream 0.025%, 1 discontinued tretinoin gel 0.025%, and 1 discontinued adapalene gel 0.1%. None of the subjects discontinued use of the white petrolatum or the adapalene solution 0.1%. Adapalene gel and solution 0.1% were statistically (P<.01) less irritating than both tazarotene gels 0.1% and 0.05%, tretinoin microsphere gel 0.1%, and tretinoin gel 0.025%, and they were not statistically different from tretinoin gel 0.025%.

  8. Actions done by SAGARPA to foster renewable energies; Acciones realizadas por la SAGARPA para el fomento de las energias renovables

    Energy Technology Data Exchange (ETDEWEB)

    Diez de Sollano Elcoro, Rodrigo [Fideicomiso de riesgo compartido, Mexico (Mexico)

    2007-06-15

    This presentation is mainly focused on all the projects carried out in order to boost renewable energies. Such projects have not only good results for the environmental sphere but also for the economic one. In the first part, there are found the general targets, which are going to foster the use of these sort of energies. Then, there are shown different kinds of photovoltaic systems. The implementation of these systems have a double target: to improve both activities: stock breeding and agriculture, and to foster the use of renewable energy. Next, there are mentioned the project investors. Similarly, there are described some of the components that are part of such projects along with their corresponding results. Finally, it is given a succinctly explanation about the conclusions as well as the future plans. [Spanish] Esta presentacion principalmente se enfoca en todos los proyectos que se han realizado para el fomento de las energias renovables, teniendo un impacto no solo ambiental sino tambien economico. En la primera parte, se encuentran los objetivos generales que se tienen para fomentar el uso de este tipo de energia. Enseguida, se muestran los diferentes sistemas basados en el uso de energia renovable. La implementacion de estos sistemas tiene un doble objetivo: mejorar de alguna manera la actividad de la ganaderia o de la agricultura, y fomentar el uso de energias renovables. Enseguida, se mencionan los inversionistas que participaron en la realizacion de los proyectos; asimismo, se describen algunos de los elementos, que forman parte de los proyectos, acompanados de sus respectivos resultados obtenidos. Finalmente, se da una breve explicacion de las conclusiones a las que se llegaron, asi como de los planes a futuro.

  9. First discussion for fostering the photovoltaic energy in Mexico; Primer coloquio para el fomento de la energia fotovoltaica en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-06-15

    The varied spheres (political, environmental, economic, scientific and social) day by day are looking for the key issues, which are going to make them to preserve or disappear either in the present or in the future. Therefore, it was carried out the first conversation in the State of Zacatecas, Mexico. Here there were shown different advances related to the renewable energies by those spheres. Generally speaking, it was in this event where there were gather together private and government organs in order to present every issue related to the use and to the promotion of the renewable energies. By these means, it was probed that the renewable energies are: the current market, the groundbreaking technology, the best option friendly-environment, the panacea for the society and for the improvement of the economy of many countries both developing countries and developed countries. The renewable energy topic is seen from different point of views. [Spanish] Las diferentes esferas que rigen el dia a dia; es decir, la politica, el medio ambiente, la economia, las ciencias y la sociedad, siempre estan en busca de cuestiones que las hagan crecer y evolucionar para asi seguir ocupando un espacio no solo en el presente sino tambien en el futuro. En esta ocasion fue en el primer coloquio, realizado en el Estado de Zacatecas, Mexico, donde dichas esferas se reunieron con el fin de mostrar sus diversos avances acerca de las energias fotovoltaicas. En otras palabras, fue en este coloquio donde se reunieron organos privados y gubernamentales con el fin de mostrar todo lo relacionado con el uso y la promocion de las energias renovables. Comprobando que las energias renovables son tanto: el mercado de hoy, la tecnologia de punta, la mejor opcion ambiental, la panacea para la sociedad y para la mejora de la economia de muchos paises en vias de desarrollo y de primer mundo. En estas ponencias no solo se habla de las energias renovables desde un aspecto cientifico, sino tambien financiero

  10. Estudo comparativo de sistemas de iluminação artificial considerando luz natural e consumo de energia

    Directory of Open Access Journals (Sweden)

    Letícia Niero Moraes

    Full Text Available Além do aproveitamento da iluminação natural, indicado como um fator primordial na economia de energia das edificações, o posicionamento das luminárias bem como de suas especificações pode contribuir para o conforto ambiental e a conservação de energia. Essas preocupações, no entanto, não fazem parte da prática atualmente estabelecida pelos profissionais de iluminação. Considerando essa lacuna, o presente trabalho visa desenvolver um estudo que aborda a avaliação de diferentes sistemas de iluminação artificial. A metodologia da pesquisa é baseada na avaliação do desempenho luminoso, como uniformidade, níveis e distribuição de iluminâncias, e consumo de energia de sistemas de iluminação artificial, através de simulação computacional. As análises de aproveitamento da luz natural foram utilizadas para uma estimativa simplificada do consumo energético para diferentes sistemas de iluminação artificial, através da divisão de circuitos de acionamento. Os sistemas de iluminação artificial propostos eram diferenciados pelas fotometrias e disposições das luminárias. Os resultados mostram diferenças significativas quanto à distribuição da iluminação, assim como no consumo de energia, chegando a economias de até 46% em relação ao projeto-base. As principais contribuições deste estudo são a obtenção de critérios que conduzam a um melhor dimensionamento do sistema de iluminação artificial.

  11. Price models of electrical energy, via stochastic processes; Modelos de precios de energia electrica, via procesos estocasticos

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Ramos, Hugo

    2008-12-15

    The electrical energy prices own very particular characteristics that make them different from the prices of any good which are immersed under the fluctuation of the laws of supply and demand. The present work proposes a revision and modification of the model for the prices of electrical energy based on stochastic processes, developed in 2002 by M.T. Barlow. Our model satisfactorily explains the dynamics of the prices, having as an example the case of the energy market of Alberta, CA. The proposed model is based on the power transformation of Yeo-Johnson in 2000, which does not have dominion restrictions. Also, it is assumed that the energy price depends on the demand, which is modeled as a process of Ornstein-Uhlenbeck. The proposed model was applied to real data, obtaining corresponding estimations of the interest parameters, as well as their validation. Also simulation results are shown to determine the empirical distribution of the estimators of maximum credibility of the parameters. [Spanish] Los precios de energia electrica poseen caracteristicas muy particulares que los hacen diferentes a los precios de cualquier bien que estan inmersos bajo la fluctuacion de las leyes de la oferta y la demanda. El presente trabajo propone una revision y modificacion del modelo para los precios de energia electrica basado en procesos estocasticos, desarrollado en 2002 por M. T. Barlow. Nuestro modelo explica satisfactoriamente la dinamica de los precios, teniendo como ejemplo el caso del mercado de energia de Alberta, Ca. El modelo propuesto esta basado en la transformacion potencia de Yeo-Johnson en 2000, la cual no tiene restricciones de dominio. Tambien, se asume que el precio de la energia depende de la demanda, la cual es modelada como un proceso de Ornstein-Uhlenbeck. El modelo propuesto se aplico a datos reales, obteniendo estimaciones correspondientes de los parametros de interes, asi como su validacion. Tambien se muestran resultados de simulacion para determinar la

  12. Renewable energies. 25 years of UNAM in Temixco; Energias renovables. 25 anos de la UNAM en Temixco

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    At the Universidad Nacional Autonoma de Mexico (UNAM), the research in renewable energy began since the decade of 70's. In 1985 the Laboratory of Solar Energy (LES) of the Institute for Research in Materials in Temixco, Morelos was inaugurated, and in 1996 this became the Energy Research Center (CIE) of the UNAM. Currently, CIE is the only research center of the UNAM devoted mainly to the study and development of applications of renewable energies in Mexico. In its 25 years of existence, the LES-CIE has shown to be a university entity with a high academic performance: both in the scientific and technological production, as in the formation of high quality human resources, its outreach activities and more recently with the linkage. This commemorative book for the 25 years was made with the intention of leaving constancy of the origins and evolution of what today is done in this University Research Center. [Spanish] En la Universidad Nacional Autonoma de Mexico (UNAM), se iniciaron las investigaciones en energias renovables desde la decada de los anos 70's. En 1985 se inaugura el Laboratorio de Energia Solar (LES) del Instituto de Investigaciones en Materiales en Temixco, Morelos y en 1996 este se transforma en el Centro de Investigacion en Energia (CIE) de la UNAM. Actualmente, el CIE es el unico centro de investigacion de la UNAM dedicado principalmente al estudio y desarrollo de aplicaciones de las energias renovables en Mexico. En sus 25 anos de existencia, el LES-CIE ha mostrado ser una entidad universitaria con un alto rendimiento academico: tanto en la produccion cientifica y tecnologica, como en la formacion de recursos humanos de alta calidad, sus actividades de difusion y mas recientemente con la vinculacion. Este libro conmemorativo por los 25 anos se realizo con el proposito de dejar constancia de los origenes, evolucion y de lo que hoy es y se hace en este Centro Universitario de Investigacion.

  13. Study of nuclear glasses alteration gel and synthesis of some model gels; Etude du gel d`alteration des verres nucleaires et synthese de gels modeles

    Energy Technology Data Exchange (ETDEWEB)

    Ricol, S.

    1995-10-05

    This work deals with the general problem of alteration of the reference nuclear glass R7T7. Attention is paid particularly to the altered layer formed at the glass surface during alteration process. In opposition to previous works, related essentially to glass dissolution kinetics based on chemical analyses of lixiviated elements, this thesis deals with alteration problems through structural studies of the reference glass and derived gel. This approach allows the determination of mechanisms for the gel formation and a better understanding of the behaviour of glasses towards lixiviation. Both approaches appeared complementary. Based on several spectroscopic techniques, this work showed the particular role of cations such as calcium, zirconium and iron. Studies of silica-based synthetic gels showed the synergic effect of formers cation and of one highly coordinated cation. The variation of the wavenumber related to Si-O-Si asymmetric stretching vibration can be correlated to O/Si ratio for ternary systems Si/Na/Zr. On the contrary, the Si losses of the materials depend on the number of non-bridging oxygen atoms. In the perspective of long-term behaviour, the alteration gel presents better characteristics than initial glass. It is therefore a highly stable material in static conditions. In the same way, synthetic gels are materials with very low solubilities (much lower than the alteration gel) and could be used as confining matrices. (authors). refs., 71 figs., 37 tabs.

  14. Polymeric gels for intravaginal drug delivery.

    Science.gov (United States)

    Cook, Michael T; Brown, Marc B

    2018-01-28

    Intravaginal drug delivery can elicit a local effect, or deliver drugs systemically without hepatic first pass metabolism. There are a number of emerging areas in intravaginal drug delivery, but the vagina is a challenging route of administration, due to the clearance mechanisms present which result in poor retention of dosage forms, and the potential for irritation and other adverse reactions. Gel formulations are desirable due to the ease of application, spreading and that they cause little to no discomfort to the patient. However, these dosage forms, in particular, are poorly retained and traditional gels typically have little control over drug release rates. This has led to a large number of studies on improving the retention of vaginal gels and modulating the controlled release of drugs from the gel matrix. This review outlines the anatomy and physiology of the vagina, focussing on areas relevant to drug delivery. Medical applications of vaginally administered medicines is then discussed, followed by an overview of polymeric gels in intravaginal drug delivery. The sensorial properties of intravaginal gels, and how these relate to user compliance are also summarised. Finally, some important barriers to marketing approval are described. Copyright © 2017 Elsevier B.V. All rights reserved.

  15. Basic investigations on LCV micelle gel

    Science.gov (United States)

    Ebenezer, S. B.; Rafic, M. K.; Ravindran, P. B.

    2013-06-01

    The aim of this study was to investigate the feasibility of using Leuco Crystal Violet (LCV) based micelle gel dosimeter as a quality assurance tool in radiotherapy applications. Basic properties such as absorption coefficient and diffusion of LCV gel phantom over time were evaluated. The gel formulation consisted of 25 mM Trichloroacetic acid, 1mM LCV, 4 mM Triton X-100, 4% gelatin by mass and distilled water. The advantages of using this gel are its tissue equivalence, easy and less preparation time, lower diffusion rate and it can be read with an optical scanner. We were able to reproduce some of the results of Babic et al. The peak absorption was found to be at 600 nm and hence a matrix of yellow LEDs was used as light source. The profiles obtained from projection images confirmed the diffusion of LCV gel after 6 hours of irradiation. Hence the LCV gel phantom should be read before 6 hours post irradiation to get accurate dose information as suggested previously.

  16. Gel nano-particulates against radioactivity; Des nanoparticules en gel contre la radioactivite

    Energy Technology Data Exchange (ETDEWEB)

    Deroin, Ph

    2004-11-01

    The Argonne research center (USA) has developed a 'super-gel' compound, a polymer close to those used in baby's diapers, which can reach a 90% efficiency in the radioactive decontamination of porous materials, like bricks or concrete. The contaminated materials are sprayed with a mixture of polymer gel and wetting agent with nano-particulates in suspension. Under the action of the wetting agent, radioactivity migrates from the pores to the gel and is trapped by the nano-particulates. The drying and recycling of the gel allows to reduce the volume of radioactive wastes. Short paper. (J.S.)

  17. Energy management system. Opti-dmaX Control; Sistema de administracion de energia. Control Opti-dmaX

    Energy Technology Data Exchange (ETDEWEB)

    Automatizacion, Productividad y Calidad S.A. de C.V. Puebla (Mexico)

    2005-07-01

    The electrical energy is an essential element in the activities of the present world. Optimizing its consumption represents a competitive advantage for the companies, since the operation costs would be reduced as well as the negative impact to the environment. In billing the electrical energy the tariffs consider: the consumption, the demand, the power and the schedule of use for the medium and large companies. With the Opti-dmaX system the necessary information for the correct administration of the electrical energy consumption is obtained from the measurement in the strategic points of the installation. At the same time, the processes and services are controlled, maintaining an efficient power operation that diminishes operative costs. [Spanish] La energia electrica es un elemento indispensable en las actividades del mundo actual, y optimizar su consumo, representa una ventaja competitiva para las empresas, ya que se consigue reducir los costos de operacion y el impacto al ambiente. En la facturacion de la energia electrica las tarifas consideran: el consumo, la demanda, la potencia y el horario de uso para las medianas y grandes empresas. Con el sistema Opti-dmaX se obtiene la informacion necesaria para la correcta administracion del consumo de energia electrica a partir de la medicion en los puntos estrategicos de la instalacion. A su vez, se controlan los procesos y servicios, manteniendo una operacion energetica eficiente que minimiza los costos operativos.

  18. Competitive policies in the Nordic energy research and innovation area - eNERGIA : Part 2: Technology reports

    Energy Technology Data Exchange (ETDEWEB)

    Klitkou, Antje; Pedersen, Trond Einar; Scordato, Lisa; Mariussen, Aage

    2008-07-01

    This (Part 2: Technology reports) is the second report about the results from the eNERGIA project. The first report deals with the countries covered by the eNERGIA project, while the third report sums up the SWOT-analysis, the eNERGIA workshops and the case studies of good practice. A short synthesis report summarises the entire project. This second report mainly deals with selected renewable energy technologies from different perspectives. The report comprises the following nine chapters. Chapter 1 is the presentation of the selected renewable technologies (solar photovoltaic technology, wind technology, 2nd generation bio-energy technology, wave technology and hydroelectric technology) and a subsequent elaboration of the status of the technologies in the Nordic and Baltic countries. Chapter 2 gives an overview of patterns of international R&D collaboration as seen from the countries in question. Chapter 3 draws on technology specific patenting data and bibliometric data, describing the level of technology specific activity in each country. Chapter 4 and 5 describe the status of renewable energy production and renewable energy research respectively in each country. The four last chapters are relatively brief descriptions of the situation in the Nordic and Baltic countries. Chapter 6 gives an overview of the venture capital situation. Chapter 7 is about market regulations and Chapter 8 is about social concerns. Finally, Chapter 9 addresses infrastructural challenges. (Author) 77 figs., 70 tabs

  19. Exigências nutricionais de zebuínos: energia Nutritional requirements of zebu cattle: energy

    Directory of Open Access Journals (Sweden)

    Pedro Veiga Rodrigues Paulino

    2004-06-01

    Full Text Available Com o objetivo de determinar as exigências de energia e as eficiências de utilização da energia metabolizável para ganho de peso e mantença de zebuínos, foi desenvolvido um experimento envolvendo 19 novilhos anelorados, com peso vivo médio inicial de 270 kg. Quatro animais foram abatidos ao início do experimento, para servirem de referência para estudos posteriores, três foram alimentados ao nível de mantença e os 12 restantes foram alocados em delineamento inteiramente casualizado, com três tratamentos: 5, 35 e 65% de concentrado na base da matéria seca total. O volumoso foi constituído de pré-secado de capim-braquiária (Brachiaria brizantha e de capim-tifton 85 (Cynodon sp.. As dietas foram isonitrogenadas e os animais foram alimentados ad libitum. A exigência líquida de energia para mantença (ELm foi estimada como o anti-log do intercepto da equação obtida pela regressão linear entre o logaritmo da produção de calor (PC e o consumo de energia metabolizável (CEM, bem como pelo coeficiente "a" da equação de regressão exponencial entre a PC e o CEM dos animais do tratamento com 35% de concentrado e os do grupo mantença. As quantidades de energia e gordura no ganho elevaram-se com o aumento do peso vivo (PV dos animais. O teste de identidade dos modelos de regressão demonstrou não haver diferenças entre os tratamentos. O requisito energético diário para mantença foi de 68,60 kcal/PV0,75. A k m estimada foi de 0,66 e as k g calculadas foram de 0,26; 0,41 e 0,46, respectivamente, para concentrações de EM de 2,31; 2,47 e 2,62 Mcal/kg de MS, correspondentes aos teores de 5, 35 e 65% de concentrado na dieta. Os requisitos diários de EM e NDT para mantença de um animal de 400 kg de PV foram de 9,30 Mcal e 2,57 kg, respectivamente.A trial involving nineteen zebu steers with initial live weight of 270 kg were conducted with the objective of determining their energy requirements and the efficiency of utilization of

  20. GEL DE ALOE-VERA COMO POTENCIAL INHIBIDOR DE LA CORROSIÓN DEL ACERO DE REFUERZO ESTRUCTURAL

    Directory of Open Access Journals (Sweden)

    Héctor Herrera-Hernández

    2015-01-01

    Full Text Available En el presente trabajo se estudiaelectroquímicamente un GELextracto de las hojas de ALOE VERAcomo un posible inhibidor de la corrosión del acero de refuerzo estructuraldel concreto.Los estudiosde corrosiónse llevaron a cabo en 1M de HCl y utilizando la técnica de espectroscopia de impedancia electroquímica (EISse evaluó la resistencia a la corrosión en presencia y ausencia del GEL.Los diagramas de impedancia mostraronque la adición en diferentes proporcionesdel GELinhibe notablemente el proceso de la corrosión del acero inmerso en la solución ácida. También se determinó que las moléculas del GEL obedecena un mecanismo de fisisorciónsobre la superficie del metal de acuerdo con el modelo de isoterma de Langmuircon unG°adsde alrededor de 14.17 kJ/mol. El GEL se clasificócomo un inhibidor orgánico del tipo mixto.

  1. Análise da comercialização de energia elétrica cogerada pelo setor sucroalcooleiro no estado de São Paulo

    Directory of Open Access Journals (Sweden)

    Marilda da Penha Teixeira Nagaoka

    2003-01-01

    Full Text Available O Brasil viveu, em 2001, uma crise de oferta de energia elétrica sem precedentes que coincidiu com o processo de reestruturação do setor elétrico brasileiro e possibilitou aos autoprodutores de energia elétrica,como o setor sucroalcooleiro, comercializarem o excedente de energia, obtidos pelo processo de cogeração, que apesar do elevado potencial de comercialização, não está sendo devidamente aproveitado. Este trabalho teve por objetivo caracterizar o mercado de energia elétrica cogerada e analisar os obstáculos à comercialização da energia cogerada, à luz da existência dos custos de transação e econômicos, enfrentados pelo setor sucroalcooleiro e distribuidoras. Para a coleta de informações, foram realizadas entrevistas semi-estruturadas com o responsável pela área de cogeração das usinas e distribuidora de energia, que consistiam em perguntas pré-determinadas que foram lidas na mesma ordem e da mesma maneira para todos os entrevistados para assegurar a comparabilidade dos resultados. As entrevistas foram gravadas, transcritas e examinadas por meio da análise de conteúdo. Os resultados indicaram que poderiam ser estabelecidos contratos de longo prazo, mas os custos de transação e econômicos entre os agentes podem estar superando os benefícios da comercialização de energia elétrica cogerada, fazendo os agentes atuarem preferencialmente no mercado spot

  2. Tendencies and perspectives of the residential energy in Mexico; 1. ed.; Tendencias y perspectivas de la energia residencial en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Sheinbaum Pardo, Claudia [Instituto de Ingenieria, Mexico, D. F. (Mexico)

    1996-12-31

    production of electricity. In the fifth chapter the saving potential is presented and the conservation policies and energy efficiency of the of the OCED countries. The second part exposes the tendencies in the use of the residential energy in Mexico from 1980 to 1990 and analyzes and evaluates the possible applications of the experience of the OECD countries to the case of our country. This part is initiated in the sixth chapter and in it the tendencies of the use of residential energy in Mexico at aggregated level from 1970 to 1990 are studied and for end uses from 1980 to 1990, in this chapter is also included a calculation of the elasticities demand-price and demand income, and an aggregated analysis of the change indices. In the seventh chapter the associated emissions of the main polluting agents and green house gases associated to the use of residential energy in Mexico are presented. In the eighth chapter the conservation potential is analyzed and the necessary energy policies to achieve it. In the ninth chapter the conclusions and recommendations are presented.. Finally three appendices are presented: the first one shows the source of the data for the countries of the OECD, the second shows the procedure of auto regression and the third one the prices of the residential energy in Mexico and the present average and minimum wage. [Espanol] Este trabajo es un estudio comparativo del uso de la energia residencial en Mexico y nueve paises fundadores de la Organizacion para la Cooperacion y el Desarrollo Economico (OCDE). Su principal objetivo es conocer las causas de la tendencias en el uso de la energia residencial en dichos paises, sus efectos ambientales, el potencial tecnico de conservacion y las posibles politicas de ahorro y eficiencias energeticas. El trabajo se divide en dos partes: La primera parte presenta el analisis de las tendencias observadas durante el periodo de 1973 a 1990 asi como las perspectivas del uso de la energia residencial en Estados Unidos

  3. Greenhouse effect gases (GEI) by energy consumption; Gases efecto invernadero (GEI) por consumo de energia

    Energy Technology Data Exchange (ETDEWEB)

    Munoz Ledo C, Ramon; Bazan N, Gerardo [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2003-07-01

    carburos organicos volatiles que no son metano (NMVOC, por sus siglas en ingles) y son productos secundarios y nocivos que se obtienen de los procesos que convierten los combustibles en energia (combustion). Las principales fuentes de GEI son: fuentes fijas (industrias, residencias, comercios, servicios publicos y transformacion de energia, como la produccion de electricidad); fuentes moviles (que incluyen todo tipo de transporte que use combustible). Los combustibles que, por su volumen y eficiencia, generan mas emisiones de GEI son el petroleo crudo, gas natural y biomasa solida (lena - bagazo de cana). Cualquier esfuerzo por reducir estas emisiones es muy importante y notable si incide en estos combustibles.

  4. Evolution of gel structure during thermal processing of Na-geopolymer gels.

    Science.gov (United States)

    Duxson, Peter; Lukey, Grant C; van Deventer, Jannie S J

    2006-10-10

    The present work examines how the gel structure and phase composition of Na-geopolymers derived from metakaolin with varied Si/Al ratio evolve with exposure to temperatures up to 1000 degrees C. Gels were thermally treated and characterized using quantitative XRD, DTA, and FTIR to elucidate the changes in gel structure, phase composition, and porosity at each stage of heating. It is found that the phase stability, defined by the amount and onset temperature of crystallization, is improved at higher Si/Al ratios. Two different mechanisms of densification have been isolated by FTIR, related to viscous flow and collapse of the highly distributed pore network in the gel. Gels with low Si/Al ratio only experience viscous flow that correlates with low thermal shrinkage. Gels at a higher Si/Al ratio, which have a homogeneous microstructure composed of a highly distributed porosity, undergo both densification processes corresponding to a large extent of thermal shrinkage during densification. This work elucidates the intimate relationship between gel microstructure, chemistry, and thermal evolution of Na-geopolymer gels.

  5. Physical and chemical properties of gels. Application to protein nucleation control in the gel acupuncture technique

    Science.gov (United States)

    Moreno, Abel; Juárez-Martínez, Gabriela; Hernández-Pérez, Tomás; Batina, Nikola; Mundo, Manuel; McPherson, Alexander

    1999-09-01

    In this work, we present a new approach using analytical and optical techniques in order to determine the physical and chemical properties of silica gel, as well as the measurement of the pore size in the network of the gel by scanning electron microscopy. The gel acupuncture technique developed by García-Ruiz et al. (Mater. Res. Bull 28 (1993) 541) García-Ruiz and Moreno (Acta Crystallogr. D 50 (1994) 484) was used throughout the history of crystal growth. Several experiments were done in order to evaluate the nucleation control of model proteins (thaumatin I from Thaumatococcus daniellii, lysozyme from hen egg white and catalase from bovine liver) by the porous network of the gel. Finally, it is shown how the number and the size of the crystals obtained inside X-ray capillaries is controlled by the size of the porous structure of the gel.

  6. Mucosal effects of tenofovir 1% gel.

    Science.gov (United States)

    Hladik, Florian; Burgener, Adam; Ballweber, Lamar; Gottardo, Raphael; Vojtech, Lucia; Fourati, Slim; Dai, James Y; Cameron, Mark J; Strobl, Johanna; Hughes, Sean M; Hoesley, Craig; Andrew, Philip; Johnson, Sherri; Piper, Jeanna; Friend, David R; Ball, T Blake; Cranston, Ross D; Mayer, Kenneth H; McElrath, M Juliana; McGowan, Ian

    2015-02-03

    Tenofovir gel is being evaluated for vaginal and rectal pre-exposure prophylaxis against HIV transmission. Because this is a new prevention strategy, we broadly assessed its effects on the mucosa. In MTN-007, a phase-1, randomized, double-blinded rectal microbicide trial, we used systems genomics/proteomics to determine the effect of tenofovir 1% gel, nonoxynol-9 2% gel, placebo gel or no treatment on rectal biopsies (15 subjects/arm). We also treated primary vaginal epithelial cells from four healthy women with tenofovir in vitro. After seven days of administration, tenofovir 1% gel had broad-ranging effects on the rectal mucosa, which were more pronounced than, but different from, those of the detergent nonoxynol-9. Tenofovir suppressed anti-inflammatory mediators, increased T cell densities, caused mitochondrial dysfunction, altered regulatory pathways of cell differentiation and survival, and stimulated epithelial cell proliferation. The breadth of mucosal changes induced by tenofovir indicates that its safety over longer-term topical use should be carefully monitored.

  7. Comparative Two-Dimensional Fluorescence Gel Electrophoresis.

    Science.gov (United States)

    Ackermann, Doreen; König, Simone

    2018-01-01

    Two-dimensional comparative fluorescence gel electrophoresis (CoFGE) uses an internal standard to increase the reproducibility of coordinate assignment for protein spots visualized on 2D polyacrylamide gels. This is particularly important for samples, which need to be compared without the availability of replicates and thus cannot be studied using differential gel electrophoresis (DIGE). CoFGE corrects for gel-to-gel variability by co-running with the sample proteome a standardized marker grid of 80-100 nodes, which is formed by a set of purified proteins. Differentiation of reference and analyte is possible by the use of two fluorescent dyes. Variations in the y-dimension (molecular weight) are corrected by the marker grid. For the optional control of the x-dimension (pI), azo dyes can be used. Experiments are possible in both vertical and horizontal (h) electrophoresis devices, but hCoFGE is much easier to perform. For data analysis, commercial software capable of warping can be adapted.

  8. DNA DAMAGE QUANTITATION BY ALKALINE GEL ELECTROPHORESIS.

    Energy Technology Data Exchange (ETDEWEB)

    SUTHERLAND,B.M.; BENNETT,P.V.; SUTHERLAND, J.C.

    2004-03-24

    Physical and chemical agents in the environment, those used in clinical applications, or encountered during recreational exposures to sunlight, induce damages in DNA. Understanding the biological impact of these agents requires quantitation of the levels of such damages in laboratory test systems as well as in field or clinical samples. Alkaline gel electrophoresis provides a sensitive (down to {approx} a few lesions/5Mb), rapid method of direct quantitation of a wide variety of DNA damages in nanogram quantities of non-radioactive DNAs from laboratory, field, or clinical specimens, including higher plants and animals. This method stems from velocity sedimentation studies of DNA populations, and from the simple methods of agarose gel electrophoresis. Our laboratories have developed quantitative agarose gel methods, analytical descriptions of DNA migration during electrophoresis on agarose gels (1-6), and electronic imaging for accurate determinations of DNA mass (7-9). Although all these components improve sensitivity and throughput of large numbers of samples (7,8,10), a simple version using only standard molecular biology equipment allows routine analysis of DNA damages at moderate frequencies. We present here a description of the methods, as well as a brief description of the underlying principles, required for a simplified approach to quantitation of DNA damages by alkaline gel electrophoresis.

  9. Níveis de Energia na Dieta para Bubalinos em Crescimento Alimentados em Confinamento: 1. Desempenho e Bioquímica de Nutrientes Sangüíneos

    Directory of Open Access Journals (Sweden)

    Franzolin Raul

    2001-01-01

    Full Text Available Vinte e sete bubalinos em crescimento da raça Mediterrâneo foram mantidos em confinamento por cerca de 140 dias, visando avaliar os efeitos de diferentes níveis de energia ingerida sobre o desempenho e as concentrações de glicose, proteína total e uréia no sangue. Os tratamentos constituíram de três níveis de ingestão de energia: BE (Baixa Energia, RE (Requerida Energia e AE (Alta Energia. RE foi calculado com 125 kcal/kg0,75/dia de energia metabolizável para mantença; BE com 20% abaixo e AE com 20% acima desse nível, adotando-se ganho diário médio de 800 g, correspondendo a 10 kcal de EM/g de ganho para animais até 250 kg e mais 0,02 kcal/kg de peso acima de 250 kg/g de ganho. Amostras de sangue foram colhidas em três períodos, ou seja, 44, 66 e 88 dias após o início do experimento. Houve diferenças significativas no ganho de peso médio diário entre BE (773,9 g, RE (942,8 g e AE (1071,8 g e nos níveis de uréia no soro. As ingestões médias de matéria seca (g/kg0,75 e de energia metabolizável estimadas (Mcal/animal/dia foram, respectivamente: 89,54 e 17,13 para BE, 92,87 e 18,24 para RE e 95,66 e 20,94 para AE. Com base no ganho de peso obtido e na quantidade diária de energia metabolizável ingerida, concluiu-se que o requerimento de energia metabolizável total para bubalinos em crescimentos recomendado por KEARL (1982 encontra-se superestimado em média de 14,73%.

  10. Avaliação dos métodos de Grant, Vora & Weeks e dos mínimos quadrados na determinação do valor incremental do mercado de carbono nos projetos de geração de energia elétrica no Brasil

    Directory of Open Access Journals (Sweden)

    Fabio Rodrigo Siqueira Batista

    2011-04-01

    Full Text Available Este trabalho tem por objetivo avaliar a robustez dos métodos de Grant, Vora & Weeks e dos Mínimos Quadrados quando aplicados na avaliação de projetos de geração de energia eletrica a partir de fontes renovavéis desenvolvidos no ambito do Mecanismo de Desenvolvimento Limpo do Protocolo de Quioto. Em primeiro lugar, a metodologia proposta consiste em utilizar o modelo NEWAVE para estabelecer cenários hidrológicos de despacho para as usinas conectadas ao sistema interligado nacional. Em seguida, baseado no escopo da metodologia ACM0002, considera-se a incerteza associada a evolução temporal da linha de base do projeto. Finalmente, o valor incremental do mercado de carbono e estimado utilizando-se a Teoria das Opções Reais. Para tanto os métodos numericos citados anteriormente são utilizados sob a premissa de que o preço do crédito de carbono se comporta de forma aleatoria segundo as premissas de um Movimento Geometrico Browniano

  11. Project of energy saving in compressed air; Proyecto de ahorro de energia en aire comprimido

    Energy Technology Data Exchange (ETDEWEB)

    Automatizacion, Productividad y Calidad S.A. de C.V. Puebla, (Mexico)

    2005-07-01

    The objective of this project is to reduce the operation costs by means of the energy saving through the use of the compressed air system. For this purpose the solenoid valves controlled per time and the manually acted valves of sphere must be replaced by pneumatic purges that remove from the system the condensed humidity without discharging air and which act automatically when the water reaches the level of unloading in its deposit. The pressure level is the reduction of the operation rank of pressure in the compressors, satisfying the operation requirements of the process equipment. [Spanish] El objetivo de este proyecto es reducir el costo de operacion mediante el ahorro de energia en la utilizacion del sistema de aire comprimido. Para ello se tienen que remplazar las valvulas solenoides controladas por tiempo y valvulas de esfera actuadas manualmente por purgas neumaticas que remueven del sistema la humedad condensada sin descargar aire y que actuan en forma automatica al alcanzar el agua el nivel de descarga en su deposito. El nivel de presion es la reduccion del rango de operacion de presion de los compresores, satisfaciendo los requerimientos de operacion de los equipos de proceso.

  12. Evaluation of radioactive wastes in Instituto de Energia Atomica (Sao Paulo-Brazil)

    International Nuclear Information System (INIS)

    Sawakuchi, R.S.

    1978-01-01

    An evaluation of present and future production of radioactive waste in several departments of the Instituto de Energia Atomica has been done. Taking into account this evaluation, the criteria for disposal and convenient treatment technique have been studied. The most critical form of liquid radioactive waste is that of 131 I processing because high concentration of radiotellurium always accompanies this form of waste. Ion exchange and precipitation techniques were used to study this waste processing. Two kinds of resins were used by the ion exchange method: the strong anionic and the stron cationic. Quantitative tellurium retention has not been attained by the ion exchange method using either resins. The technique of precipitation of radioactive tellurium as ammonium tellurate was also used, allowing us to obtain more than 99% of tellurium removal. The remaining radioactive wastes can be eliminated using the storage for decay criteria with further release to the sewers in the case of liquids and burial in the case of solids. (Author) [pt

  13. Environmental radiometric control at the vicinity of the Instituto de Energia Atomica, Sao Paulo, Brazil

    International Nuclear Information System (INIS)

    Bedani, M.I.

    1979-01-01

    Optimized derived limits (ODL) for gaseous and liquid wastes released to the environment of Instituto de Energia Atomica (IEA) following the ICRP's recommendations were determined. Techniques for routine environmental monitoring were implanted in order to ensure that these limits be respected. The treatment of liquid wastes which gives rise to the optimized discharge resulted from cost-benefit analysis, is the elimination of medium half-lived radioisotopes in the soil. The ODL value for iodine-131 is 50mCi/y and 7,5 Ci/y for gaseous and liquid effluents, respectively. The ODL values for other radionuclides of radiosanitary interest in liquid waste also determined. The most appropriate environmental monitoring techniques for IEA were studied and parameters of radioactive material dilution in the atmosphere and water courses were determined. Sample collection points were chosen to obtain the most representative data for the evaluation of radioactive dose in the critical group and the detriment produced in the population. Detection system and methods were calibrated and standardized for the determination of radionuclides in wastes released from IEA in order to evaluate their concentrations in the main transference pathways. (Author) [pt

  14. Advantage of the renewable energies in isolated zones; Aprovechamiento de las energias renovables en zonas aisladas

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza Zazueta, Jose Antonio [Fideicomiso de Riesgo Compartido de la SAGARPA (Mexico)

    2007-07-15

    The present article has as objective to present the experiences obtained for more than ten years, in the development and implementation of actions that in the matter of renewable energy have been orchestrated in the Mexican field by the Secretariat of Agriculture, Animal Industry, Rural Development, Fishing, and Nutrition, trough the Shared Risk Trust Fund. The activities began in 1994; the most common applications realized are the water pumping for the drinking trough of cattle and the automation of the irrigation in small surfaces with fruit trees, vegetables, forages and the operation of greenhouses. [Spanish] El presente articulo tiene como objetivo presentar las experiencias obtenidas durante mas de diez anos, en el desarrollo e implementacion de acciones que en materia de energia renovable se han instrumentado en el campo mexicano por la the Secretaria de Agricultura, Ganaderia, Desarrollo Rural Pesca y Alimentacion, a traves del Fideicomiso de Riesgo Compartido. Las actividades se iniciaron en 1994, las aplicaciones mas comunes realizadas son el bombeo de agua para el abrevadero de ganado y la tecnificacion del riego en pequenas superficies con frutales, hortalizas, forrajes y la operacion de invernaderos.

  15. Energy and the exercise of the power; Energia y ejercicio del poder

    Energy Technology Data Exchange (ETDEWEB)

    Quiros Corradi, Alberto [Maraven S.A. (Venezuela)

    2007-07-15

    In different periods of the history, the central spot of the power game, played among nations, has been occupied by certain specific topics for a while. Among the occupants there are found: ground, food, religion, treasure and trade. Despite the fact that his arrival was unnoticed, there have been already 20 years since the energy -more specifically by the crude oil- has become the new occupant of such spot. Although, this occupant is not going to be the last one, it still has a long way to cover on the spot of the worldwide forces. [Spanish] En diferentes periodos de la historia, ciertos temas especificos han llegado a ocupar durante algun tiempo una posicion focal en el juego de poder entre naciones, grupos o individuos. Entre esos temas estan la tierra, los alimentos, la religion, el tesoro y el comercio. En los ultimos 20 anos, y de manera inadvertida en un principio, la energia -mas especificamente el petroleo- ha pasado a ocupar este papel central. Si bien no se puede esperar que lo retenga para siempre, en los proximos anos seguira en el centro de la interaccion de las fuerzas mundiales.

  16. Municipal hydraulic planning for energy saving; Planeacion hidraulica municipal para el ahorro de energia

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Garcia, Enrique [PTF S.C. Consultores, Leon, Gto. (Mexico)

    1999-07-01

    The efficient handling of the economic and natural resources of the municipalities, is nowadays so much complex, that it requires a formal planning. In the public service of potable water supply, two fundamental approaches are conjugated to consider: the rational use of the water resource and the efficient use of the electrical energy, for its extraction from the underground deep reservoirs. In the paper that is presented, the individual features of the previous matters are described and the positive results in a municipality of the Guanajuato's Low Lands (Bajio ), where already the dual objectives are obtained and that with a more professional municipal hydraulic planning, these will be permanent, with the inherent benefit towards the population. [Spanish] El manejo eficiente de los recursos economicos y naturales de los municipios, es hoy en dia cada vez mas complejo, que requiere una planeacion formal. En el servicio publico de abastecimiento de agua potable, se conjugan dos enfoques primordiales a considerar: el uso racional del recurso agua y la utilizacion eficiente de la energia electrica, para su extraccion de los acuiferos subterraneos profundos. En el trabajo que se presenta, se describen las particularidades de lo anterior y los resultados positivos en un municipio del Bajio guanajuatense, donde ya se logran los objetivos duales y que con una planeacion hidraulica municipal mas profesional, estos seran permanentes, con el beneficio inherente hacia la poblacion.

  17. Jüri Käo: Eesti Energia jääb isegi börsil poliitikute kontrolli alla / Jüri Käo ; intervjueerinud Sulev Vedler

    Index Scriptorium Estoniae

    Käo, Jüri, 1965-

    2010-01-01

    Eesti Energia nõukogu esimees ei poolda mitte Eesti Energia suuremahulist börsile viimist, vaid vähemusaktsiate börsil noteerimist. Tema sõnul on IPO suurim oht, et sellest saab poliitilise valimisvõitluse objekt ning unustatakse, et energeetikas tehakse otsuseid 30 ja 50 aasta perspektiivis

  18. Mecánica orbital para un viaje interestelar utilizando velas solares

    OpenAIRE

    Rocas Alonso, Marc; Mendez Heredero, Adrià

    2016-01-01

    Es sabido que el espacio es y será objeto de estudios e investigaciones para responder algunas de las preguntas más antiguas de la humanidad. El propósito inicial del trabajo surgió del planteamiento sobre la viabilidad de realizar una misión espacial cuya meta fuese llegar a las inmediaciones de una estrella diferente al Sol utilizando un método de propulsión viable. El trabajo consiste en dos partes considerablemente diferenciadas. En primer lugar se presenta un estudio del estado del...

  19. Obtención de fases del cemento utilizando desechos agrícolas e industriales

    OpenAIRE

    Treviño Cardona, Brenda; Gómez de la Fuente, Idalia

    2002-01-01

    El presente artículo muestra los resultados en la obtenci ón de fases mineralógicas cementicias, utilizando como materia prima cenizas de cascarilla de arroz y ceniza volante mezclados con tres tipos de materiales dolomíticos que contienen carbonatos de calcio en proporciones de 66 y 52%, denotados éstos como cal1 y cal2, respectivamente. Las muestras se prepararon en diferentes proporciones mediante el mezclado de SiO2:CaO, la sílice proviene de ceniza volante y de...

  20. Degradação de poliolefinas utilizando catalisadores zeolíticos

    OpenAIRE

    Valle,Maria Letícia M.; Guimarães,Maria José O. C.; Sampaio,Cristiane M. S.

    2004-01-01

    Neste trabalho foi estudada a degradação de alguns dos principais constituintes dos rejeitos plásticos (polietileno de alta densidade (HDPE), polietileno de baixa densidade (LDPE) e polipropileno (PP)), empregando-se um catalisador exausto de unidades de craqueamento de fluidos (FCC) e um catalisador zeolítico (ADZ3) sintetizado em laboratório. Utilizando técnicas de termogravimetria (TG-DTG) e cromatografia gasosa (CG), foi possível avaliar os produtos gerados no craqueamento destas poliolef...

  1. Obturación de conductos curvos utilizando técnicas termoplásticas

    OpenAIRE

    López, M.; Tissone, S.; Jara Ortiz, M.; Zaracho, O. H.; Bustos, M. J.; Sapienza, María Elena

    2015-01-01

    Conocer las técnicas termoplásticas de obturación de conductos. Los conductos radiculares son sistemas complejos por su anatomía tan particular y por medio de la endodoncia tratamos parte de ese problema. Las técnicas de obturación convencionales, utilizando conos de gutapercha y cemento se podían utilizar en conductos curvos o con ciertas curvaturas: No así en conductos muy curvos por la dificultad de la correcta utilización del instrumental y material. Por todo esto surgen nuevas técnicas d...

  2. Uma proposta de aprendizado da lógica utilizando um ambiente virtual de aprendizagem colaborativa

    OpenAIRE

    Malange, Fernando Cezar Vieira

    2005-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação. Este trabalho realiza o desenvolvimento de um curso básico de Lógica, utilizando tecnologias desenvolvidas para a Internet em atividades educacionais a distância. Oportunizando na abordagem sócio-cultural, a produção do conhecimento básico de lógica, com a utilização de um sistema computacional através de um ambiente virtual de aprendizagem cooperativa. ...

  3. Sistema de evaluación de competencias en Educación Superior utilizando Moodle

    OpenAIRE

    María José BEZANILLA; Sonia ARRANZ

    2016-01-01

    El artículo presenta el diseño de un sistema original de evaluación de competencias utilizando el libro de calificaciones de Moodle. La implantación del modelo de Aprendizaje Basado en Competencias en Educación Superior exige nuevos sistemas de evaluación que sean coherentes con este enfoque. Aunque existen diversos desarrollos tecnológicos para la evaluación de competencias, algunos de los cuales se analizan en este artículo, ninguno responde en su totalidad a modelos com...

  4. AVALIAÇÃO SENSORIAL DE VINHAS RIESLING ITÁLICO NACIONAIS UTILIZANDO PERFIL LIVRE

    OpenAIRE

    BENASSI,Marta de Toledo; DAMÁSIO,Maria Helena; CECCHI,Heloísa Máscia

    1998-01-01

    A literatura cita um grande número de trabalhos envolvendo análise sensorial descritiva para vinhos. Perfil Livre, uma nova técnica descritiva, foi utilizado na caracterização em termos de aparência, sabor e aroma para sete amostras de vinhos brancos Riesling Itálico nacionais. Doze provadores, sem experiência anterior com a técnica, foram selecionados utilizando-se teste triangular. Para o levantamento de atributos foi empregado o método rede. O número de atributos levantados por provador va...

  5. Diseño de redes de cámaras inteligentes utilizando smartphones

    OpenAIRE

    Lahoz Seguido, Fernando

    2017-01-01

    Este Trabajo Fin de Grado (TFG) presenta una herramienta software para controlar de forma remota una red de cámaras inteligentes utilizando smartphones Android. Dicha red compone un sistema de videovigilancia casero que consta de tres partes diferenciadas: teléfonos móviles (cámaras) y aplicaciones cliente y servidor. Este sistema será implementado aprovechando las posibilidades que nos ofrece Android a la hora de controlar las diferentes configuraciones de captura y envío d...

  6. Elasticity and clustering in concentrated depletion gels.

    Science.gov (United States)

    Ramakrishnan, S; Chen, Y-L; Schweizer, K S; Zukoski, C F

    2004-10-01

    X-ray scattering and rheology are employed to study the volume fraction dependence of the collective structure and elastic moduli of concentrated nanoparticle-polymer depletion gels. The nonequilibrium gel structure consists of locally densified nonfractal clusters and narrow random interfaces. The elastic moduli display a power law dependence on volume fraction with effective exponents that decrease with increasing depletion attraction strength. A microscopic theory that combines local structural information with a dynamic treatment of gelation is in good agreement with the observations.

  7. Influência da energia de soldagem na microestrutura e na microdureza de revestimentos de aço inoxidável duplex Influence of the heat input on the microstructure and microhardness of weld overlay of duplex stainless steel

    Directory of Open Access Journals (Sweden)

    Everton Barbosa Nunes

    2012-06-01

    Full Text Available Aços inoxidáveis duplex (AID são caracterizados por apresentar interessante boas propriedades mecânicas e resistência à corrosão, possuindo um vasto campo de aplicação na indústria química e petroquímica. Geralmente, os reparos dos equipamentos ou estruturas são realizados por soldagem, sendo importante a seleção de parâmetros. É de suma importância a obtenção do teor adequado de ferrita no metal de solda, sendo que a variação da energia de soldagem pode influenciar de forma direta no percentual de ferrita. Logo, o objetivo deste trabalho é avaliar a influência da variação da energia de soldagem na microestrutura e na microdureza do metal de solda do AID. Foram realizadas soldagens de revestimento com sobreposição de duas camadas sobre o aço estrutural ASTM A516 Gr.60, utilizando eletrodo revestido AWS E2209-17. Três níveis de energia (15, 20 e 24 kJ/cm foram empregados, variando-se a corrente e a velocidade de soldagem. Foi verificado que para os níveis de energia empregados não houve diferença significativa no percentual de ferrita, porém o primeiro cordão depositado apresentou maior teor de austenita em relação aos demais cordões. De forma geral, foi verificado que o primeiro cordão depositado obteve níveis maiores de microdureza. Todas as condições apresentaram microdurezas abaixo do valor crítico.Duplex stainless steels (DSS are characterized by the presentation of an interesting combination of good mechanical properties and corrosion resistance, having a wide application in chemical and petrochemical industry. Generally, the manufacture and repair of any industrial equipment involve welding operations, even though it is very important to evaluate the influence of welding parameters. It is very important to obtain appropriate ferrite content in the weld metal, so that the variation of heat input can influence on the ferrite content directly. Therefore, the aim this work is to evaluate the

  8. Pouring and running a protein gel by reusing commercial cassettes.

    Science.gov (United States)

    Hwang, Alexander C; Grey, Paris H; Cuddy, Katrina; Oppenheimer, David G

    2012-02-12

    The evaluation of proteins using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis is a common technique used by biochemistry and molecular biology researchers. For laboratories that perform daily analyses of proteins, the cost of commercially available polyacrylamide gels (~$10/gel) can be considerable over time. To mitigate this cost, some researchers prepare their own polyacrylamide gels. Traditional methods of pouring these gels typically utilize specialized equipment and glass gel plates that can be expensive and preclude pouring many gels and storing them for future use. Furthermore, handling of glass plates during cleaning or gel pouring can result in accidental breakage creating a safety hazard, which may preclude their use in undergraduate laboratory classes. Our protocol demonstrates how to pour multiple protein gels simultaneously by recycling Invitrogen Nupage Novex minigel cassettes, and inexpensive materials purchased at a home improvement store. This economical and streamlined method includes a way to store the gels at 4°C for a few weeks. By re-using the plastic gel cassettes from commercially available gels, labs that run frequent protein gels can save significant costs and help the environment. In addition, plastic gel cassettes are extremely resistant to breakage, which makes them ideal for undergraduate laboratory classrooms.

  9. Energia estática na atmosfera sobre o Nordeste do Brasil: fluxo e variação sazonal de energia Static energy in the atmosphere over Northeast Brazil: flow and seasonal variation of energy

    Directory of Open Access Journals (Sweden)

    Ranyére S. Nóbrega

    2006-03-01

    Full Text Available Neste trabalho estudou-se a variação sazonal de energia estática da atmosfera sobre a região Nordeste do Brasil (NEB. Foram utilizados dados climatológicos de Reanálises do "National Center for Environmental Prediction - National Center for Atmospheric Research" (NCEP-NCAR referentes à média do período de 12 anos (1982 a 1993, em 17 níveis de pressão. Analisaram-se os perfis verticais médios das energias estáticas seca, úmida e saturada, assim como os campos do fluxo e da divergência do fluxo das respectivas energias, para os meses de março, junho, setembro e dezembro. Os resultados revelam que os valores de energia total indicam diferença quase insignificante mês a mês; entretanto, as diferenças entre as energias úmidas e saturadas são significativas e conduzem a interpretações úteis. A convergência e a divergência de massa, que são entendidas como efeitos dinâmicos, são os principais responsáveis para que ocorra a precipitação, e o que determina a possibilidade de convecção sobre a região é a quantidade de energia de inibição convectiva. A atmosfera sobre o NEB exporta vapor d'água durante os meses secos e o importa nos meses chuvosos.In this work the seasonal variation of static energy of the atmosphere over Brazil's Northeast region (NEB was studied. Climatological data of "Reanálises" of the National Center for Environmental Prediction - National Center for Atmospheric Research (NCEP-NCAR referring to average of 12 years (1982 to 1993 in 17 pressure levels were used. The average vertical profiles of the dry, moist and saturated static energies, as well as the field of the flow and of the divergence of the flow of the respective energies were analyzed, for the months of March, June, September and December. The results reveal that the values of total energy indicate almost insignificant difference month by month; however, the differences among moist and saturated energies are significant and lead to

  10. Eliminating blurry bands in gels with a simple cost-effective repair to the gel cassette.

    Science.gov (United States)

    Bingaman, Jamie L; Frankel, Erica A; Hull, Chelsea M; Leamy, Kathleen A; Messina, Kyle J; Mitchell, David; Park, Hongmarn; Ritchey, Laura E; Babitzke, Paul; Bevilacqua, Philip C

    2016-12-01

    Gel electrophoresis and subsequent imaging using phosphorimagers is one of the most important and widely used techniques in RNA and DNA analysis. Radiolabeling nucleic acids with 32 P and detecting bands using a phoshorimager are useful both in a qualitative sense for nucleic acid detection and in a quantitative sense for structural, kinetic, or binding-based assays. Because of this, good resolution of gel bands based on molecular weight and size of RNA or DNA is essential for analysis. The appearance of blurry gel bands of 32 P-labeled RNA and DNA thus represents a serious problem in the laboratory. A quick search on the Internet uncovers numerous reports begrudging the appearance of blurry bands, as well as attempts to fix them without success. Indeed, our laboratories were beset by the intermittent problem of blurry gels for over one year before we found a solution. Herein we describe a simple and cost-effective solution to a problem that we show originates from the phosphorimager cassettes rather than the integrity of the gel itself. We hope that the information provided here will lead to immediate help for other laboratories experiencing similar issues with labeled nucleic acid gel-based assays. The improvement in the clarity of the gels is nothing short of astonishing in many instances and will lead to higher resolution images for analysis and publications. © 2016 Bingaman et al.; Published by Cold Spring Harbor Laboratory Press for the RNA Society.

  11. Tough Amphiphilic Gels for Antifouling Applications

    Science.gov (United States)

    Villada, Laura M.

    Biofouling is the attachment of unwanted organisms on a surface, and it is influenced by a host of variables including the chemistry of the material as well as both the surface and bulk properties, and controlling and understanding the effect of these properties is critical for the development of effective materials to combat biofouling. All surfaces that are submerged in water are subject to the rapid colonization of a wide range of marine organisms. Marine biofouling decreases fuel efficiency, costing the Navy millions of dollars in penalty, as well as having drastic environmental effects. Previous prevention of biofouling in marine systems has been accomplished by the administration of biocides and toxic coatings. In recent years, increased concerns about the impacts of these hazardous compounds into marine ecosystems has spurred efforts to develop cost effective, non-toxic, and durable anti-fouling coatings. Hydrogels, hydrophilic crosslinked networks, are being used to modify silicone marine coatings and have demonstrated potential at combatting biofouling. Understanding the impact of amphiphilic materials, i.e. their structure and properties, on biofouling is of great importance in order to address the need in the industry. In this study, poly(2-hydroxyethyl methacrylate) (HEMA) crosslinked networks were tailored to investigate the influence of their surface and bulk properties on biofouling. Previous research utilizing HEMA-siloxane gels suggested a relationship between molecular weight between crosslinks, M c, and the attachment of soft fouling sporelings of the green algae U. linza and adsorption of the protein bovine serum albumin (BSA), and the initial thrust of this dissertation was aimed at resolving this relationship. Gel composition was modified by varying the siloxane crosslinking agent and the siloxane hydrophobic monomer concentrations. The gels exhibited an increase in elastic modulus from 0.17 to 8.55 MPa that coincided with an increasing

  12. Sistema de geração distribuida fontes CA e CC conectado a rede monofasica e controle eletronico da qualidade da energia eletrica

    OpenAIRE

    Ricardo Quadros Machado

    2005-01-01

    Resumo: Esta tese apresenta uma nova forma de conexão direta entre um gerador de indução trifásico e uma rede monofásica, situação típica de ambientes rurais, com possibilidade de geração local de energia. O funcionamento do sistema prevê que seja garantida ao usuário local energia elétrica de boa qualidade. Por energia de boa qualidade entende-se: tensões senoidais e equilibradas, freqüência fixa e boa regulação de tensão. Para a rede monofásica, controla-se o fluxo de potência de modo que o...

  13. Normoxic polymer gel - basic characterisation and clinical use

    International Nuclear Information System (INIS)

    Scheib, S G; Vogelsanger, W; Gianolini, S; Crescenti, R

    2004-01-01

    The formulation for a new polymer gel, which is made under normal atmospheric conditions, has been published. Because manufacturing and processing can be performed under normal atmospheric conditions, the gel is also called normoxic. Only a few accessories for gel production are necessary, facilitating the use of this gel, which can be easily produced in a clinical environment. The purpose of this study, which is work in progress, was to produce several gel batches with varying concentrations of their compounds, to measure dose response curves, to investigate ageing effects and to use this polymer gel in 3D absolute dose verifications in radiosurgery, IMRT and proton therapy

  14. Multiple-phase behavior and memory effect of polymer gel

    CERN Document Server

    Annaka, M; Nakahira, T; Sugiyama, M; Hara, K; Matsuura, T

    2002-01-01

    A poly(4-acrylamidosalicylic acid) gel (PASA gel) exhibits multiple phases as characterized by distinct degrees of swelling; the gel can take one of four different swelling values, but none of the intermediate values. The gel has remarkable memory: the phase behavior of the gel depends on whether the gel has experienced the most swollen phase or the most collapsed phase in the immediate past. The information is stored and reversibly erased in the form of a macroscopic phase transition behavior. The structure factors corresponding to these four phases were obtained by SANS, which indicated the presence of characteristic structures depending on pH and temperature, particularly in the shrunken state. (orig.)

  15. Protein electrophoretic migration data from custom and commercial gradient gels

    Directory of Open Access Journals (Sweden)

    Andrew J. Miller

    2016-12-01

    Full Text Available This paper presents data related to the article “A method for easily customizable gradient gel electrophoresis” (A.J. Miller, B. Roman, E.M. Norstrom, 2016 [1]. Data is presented on the rate of electrophoretic migration of proteins in both hand-poured and commercially acquired acrylamide gradient gels. For each gel, migration of 9 polypeptides of various masses was measured upon completion of gel electrophoresis. Data are presented on the migration of proteins within separate lanes of the same gel as well as migration rates from multiple gels.

  16. The mechanism and properties of acid-coagulated milk gels

    Directory of Open Access Journals (Sweden)

    Chanokphat Phadungath

    2005-03-01

    Full Text Available Acid-coagulated milk products such as fresh acid-coagulated cheese varieties and yogurt areimportant dairy food products. However, little is known regarding the mechanisms involved in gel formation, physical properties of acid gels, and the effects of processing variables such as heat treatment and gelation temperature on the important physical properties of acid milk gels. This paper reviews the modern concepts of possible mechanisms involved in the formation of particle milk gel aggregation, along with recent developments including the use of techniques such as dynamic low amplitude oscillatory rheology to observe the gel formation process, and confocal laser scanning microscopy to monitor gel microstructure.

  17. Uso do abate comparativo na determinação da exigência de energia de mantença de gado de corte pastejando capim-elefante: descrição da metodologia e dos resultados Use of comparative slaughter to set maintenance energy requirements of beef cattle grazing elephantgrass: description of methodology and results

    Directory of Open Access Journals (Sweden)

    Carlos Augusto de Alencar Fontes

    2005-10-01

    Full Text Available Determinou-se o requerimento líquido de energia de mantença de novilhos mantidos em regime exclusivo de pastejo, em capim-elefante (Pennisetum purpureum, Schum cv. Napier. O experimento teve duração de 175 dias, utilizando-se nove piquetes, estabelecidos em terreno plano, com área individual de 0,5 ha, sob pastejo rotacionado. Foram utilizados 36 novilhos ¾Gir-Holandês com 332 ± 37 kg e média de 20 meses de idade inicial. Metade dos animais teve o tempo de pastejo restrito a quatro horas por dia, de forma a se limitar o consumo de energia a pouco acima do nível de mantença, e metade teve acesso irrestrito à pastagem. Seis novilhos foram abatidos no início do experimento, para se determinar a composição corporal inicial (grupo referência e seis (três de cada tratamento a intervalos sucessivos de 35 dias. A composição corporal dos animais abatidos foi determinada por análise química de amostras representativas de todo o corpo. As exigências líquidas de energia para mantença foram estimadas como o calor produzido em nível zero de ingestão de energia metabolizável, ajustando-se equações do logaritmo da produção de calor em função do consumo de energia metabolizável, por dia e por unidade de tamanho metabólico (kg0,75. Foi ajustada uma equação, calculando-se o tamanho metabólico em função do peso vivo (PV e outra em função do peso de corpo vazio (PCVZ. O consumo e a digestibilidade da forragem ingerida (extrusa foram determinados mensalmente. O tempo de pastejo limitado a quatro horas diárias assegurou ingestão de energia em nível pouco acima da mantença, conforme indicaram os ganhos de peso individuais, evidenciando que este procedimento pode ser recomendado para trabalhos futuros. A exigência de energia de mantença encontrada foi de 57 kcal/kg PV0,75 ou 63,27 kcal/kg PCVZ0,75. Os valores obtidos estão dentro da faixa de resultados obtidos no Brasil, sendo mais baixos que os valores recomendados no

  18. Economia de energia e redução do pico da curva de demanda para consumidores de baixa renda por agregação de energia solar térmica

    OpenAIRE

    Salazar, Juan Pablo de Lima Costa

    2004-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Mecânica. O objetivo principal do trabalho foi o estabelecimento de uma metodologia de levantamento do potencial de economia e redução no pico da curva de demanda de energia elétrica no horário de ponta para consumidores de baixa renda, através do uso de sistemas de aquecimento solar compactos (com reservatório térmico integrado à placa coletora). Com o objetivo de q...

  19. Initial investigation of a novel light-scattering gel phantom for evaluation of optical CT scanners for radiotherapy gel dosimetry

    International Nuclear Information System (INIS)

    Bosi, Stephen; Naseri, Pourandokht; Puran, Alicia; Davies, Justin; Baldock, Clive

    2007-01-01

    There is a need for stable gel materials for phantoms used to validate optical computerized tomography (CT) scanners used in conjunction with radiation-induced polymerizing gel dosimeters. Phantoms based on addition of light-absorbing dyes to gelatine to simulate gel dosimeters have been employed. However, to more accurately simulate polymerizing gels one requires phantoms that employ light-scattering colloidal suspensions added to the gel. In this paper, we present the initial results of using an optical CT scanner to evaluate a novel phantom in which radiation-exposed polymer gels are simulated by the addition of colloidal suspensions of varying turbidity. The phantom may be useful as a calibration transfer standard for polymer gel dosimeters. The tests reveal some phenomena peculiar to light-scattering gels that need to be taken into account when calibrating polymer gel dosimeters

  20. SAXS study of silica sols, gels and glasses obtained by the sol gel process

    International Nuclear Information System (INIS)

    Santos, D.I. dos; Aegerter, M.A.

    1988-01-01

    Systematic SAXS studies have been performed at the LURE Synchrotron, Orsay, using an intense beam of point like cross-section to obtain information about the sol -> humid gel -> dried gel -> silica glass transformation. The intensity curves have been analysed in term of power law in log-log plots, whose exponent is related to mass and surface fractal dimensions of the structure. It was found that almost all phases present fractal structures and for the case of basic gels, is of hierarchical nature. The aerogels are formed by a dense matrix, with a smooth surface and exhibit a very narrow auto-similarity range that gives a mass fractal dimension. (author) [pt

  1. Valor nutricional e energia metabolizável de subprodutos do trigo utilizados para alimentação de suínos em crescimento

    Directory of Open Access Journals (Sweden)

    William Rui Wesendonck

    2013-02-01

    Full Text Available O objetivo deste trabalho foi avaliar o valor nutricional e energético de subprodutos do trigo, em dietas para suínos em crescimento, e obter equações de predição da energia metabolizável. Foram utilizados 36 suínos machos, castrados, alojados em gaiolas metabólicas individuais. Realizou-se a coleta total de fezes e urina em dois períodos de dez dias: cinco para adaptação e cinco para coleta. Utilizou-se o delineamento de blocos ao acaso, tendo-se considerado o período de coleta como bloco, com seis tratamentos e seis repetições. A dieta referência foi substituída em 30% por um dos subprodutos testados: farinheta, farelo fino, farelo de trigo, farelo grosso e farelo grosso moído; este último usado para avaliar a influência da granulometria na digestibilidade. A fibra bruta foi a variável que proporcionou a melhor estimativa da energia metabolizável. O farelo fino foi superior em energia digestível e metabolizável, em comparação ao farelo grosso moído. O farelo grosso moído apresentou os menores coeficientes de digestibilidade, e a diminuição de seu diâmetro geométrico médio não aumentou a digestibilidade dos nutrientes e da energia. Entre os subprodutos avaliados, a farinheta apresenta maior energia digestível, energia metabolizável e proteína digestível, o que mostra elevado potencial para utilização em dietas para suínos em crescimento.

  2. Gel bead composition for metal adsorption

    Science.gov (United States)

    Scott, Charles D.; Woodward, Charlene A.; Byers, Charles H.

    1990-01-01

    The invention is a gel bead comprising propylene glycol alginate and bone gelatin and is capable of removing metals such as Sr and Cs from solution without adding other adsorbents. The invention could have application to the nuclear industry's waste removal activities.

  3. Gel phase in hydrated calcium dipicolinate

    Science.gov (United States)

    Rajak, Pankaj; Mishra, Ankit; Sheng, Chunyang; Tiwari, Subodh; Krishnamoorthy, Aravind; Kalia, Rajiv K.; Nakano, Aiichiro; Vashishta, Priya

    2017-11-01

    The mineralization of dipicolinic acid (DPA) molecules in bacterial spore cores with Ca2+ ions to form Ca-DPA is critical to the wet-heat resistance of spores. This resistance to "wet-heat" also depends on the physical properties of water and DPA in the hydrated Ca-DPA-rich protoplasm. Using reactive molecular dynamics simulations, we have determined the phase diagram of hydrated Ca-DPA as a function of temperature and water concentration, which shows the existence of a gel phase along with distinct solid-gel and gel-liquid phase transitions. Simulations reveal monotonically decreasing solid-gel-liquid transition temperatures with increasing hydration, which explains the experimental trend of wet-heat resistance of bacterial spores. Our observation of different phases of water also reconciles previous conflicting experimental findings on the state of water in bacterial spores. Further comparison with an unmineralized hydrated DPA system allows us to quantify the importance of Ca mineralization in decreasing diffusivity and increasing the heat resistance of the spore.

  4. Simple Cloud Chambers Using Gel Ice Packs

    Science.gov (United States)

    Kamata, Masahiro; Kubota, Miki

    2012-01-01

    Although cloud chambers are highly regarded as teaching aids for radiation education, school teachers have difficulty in using cloud chambers because they have to prepare dry ice or liquid nitrogen before the experiment. We developed a very simple and inexpensive cloud chamber that uses the contents of gel ice packs which can substitute for dry…

  5. 21 CFR 520.1452 - Moxidectin gel.

    Science.gov (United States)

    2010-04-01

    ...) Limitations. For oral use in horses and ponies 6 months of age and older. Not for use in horses and ponies... Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS ORAL DOSAGE FORM NEW ANIMAL DRUGS § 520.1452 Moxidectin gel. (a...

  6. The Sol-Gel-Xerogel Transition

    Science.gov (United States)

    1993-11-01

    relative mobili- ty are supported by the ESR (Electron Spin Resonance) studies of * * * Ikoma et al. [301 demonstrating that polyamine copper(II) chelates...deactivation of the triplet state of the molecule in the case of RTP. Recent studies on the photoisomerization of azobenzene in sol-gel glass films by

  7. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS ...

    African Journals Online (AJOL)

    Four strains of eri, Samia cynthia ricini Lepidoptera: Saturniidae that can be identified morphologically and maintained at North East Institute of Science and Technology, Jorhat were characterized based on their protein profile by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and DNA by random ...

  8. Preparing size markers for gel electrophoresis.

    Science.gov (United States)

    Nilsen, Timothy W

    2013-12-01

    Here we present two simple methods for preparing radiolabeled size markers for gel electrophoresis. The first procedure describes the generation of an RNA marker ladder by the alkaline hydrolysis of (32)P 5'- or 3'-end-labeled RNA. The second procedure describes the labeling of DNA fragments produced by digestion of pBR322 with the restriction enzyme MspI.

  9. Denaturing urea polyacrylamide gel electrophoresis (Urea PAGE).

    Science.gov (United States)

    Summer, Heike; Grämer, René; Dröge, Peter

    2009-10-29

    Urea PAGE or denaturing urea polyacrylamide gel electrophoresis employs 6-8 M urea, which denatures secondary DNA or RNA structures and is used for their separation in a polyacrylamide gel matrix based on the molecular weight. Fragments between 2 to 500 bases, with length differences as small as a single nucleotide, can be separated using this method(1). The migration of the sample is dependent on the chosen acrylamide concentration. A higher percentage of polyacrylamide resolves lower molecular weight fragments. The combination of urea and temperatures of 45-55 degrees C during the gel run allows for the separation of unstructured DNA or RNA molecules. In general this method is required to analyze or purify single stranded DNA or RNA fragments, such as synthesized or labeled oligonucleotides or products from enzymatic cleavage reactions. In this video article we show how to prepare and run the denaturing urea polyacrylamide gels. Technical tips are included, in addition to the original protocol (1,2).

  10. Polyacrylamide gel polymerization with adjustable gelation rate

    Czech Academy of Sciences Publication Activity Database

    Wiesner, Ivo; Wiesnerová, Dana

    2002-01-01

    Roč. 32, - (2002), s. 740-742 ISSN 0736-6205 R&D Projects: GA AV ČR KSK5052113; GA ČR GA521/00/0075 Keywords : polyacrylamide gel Subject RIV: CD - Macromolecular Chemistry Impact factor: 2.173, year: 2002

  11. Thermal Decomposition Characteristics of ADU Gel Spheres

    Energy Technology Data Exchange (ETDEWEB)

    Jeong, Kyung Chai; Eom, Sung Ho; Kim, Yeon Ku; Kim, Young Min; Kim, Woong Ki; Kim, Bong Ku; Lee, Young Woo; Cho, Moon Seoung [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2013-10-15

    HTGR nuclear fuel uses a modified sol.gel GSP (Gel Supported Precipitation) method, which is a wet method used in most countries. ADU(Ammonium DiUranate) gel particles fabricated in this way pass through thermal treatments and become final UO{sub 2} microspheres. The washing characteristics such as washing volume, duration, and times during AWD(ageing, washing and drying) process after the spherical ADU gel particles preparation by the GSP method was studied. The VHTR (Very High Temperature Gas Reactor) is one of the reactor concepts in the Gen IV International Collaboration. Unlike light water reactor currently in use in Korea, a HTGR actually functions as a gas cooled reactor where the high temperature heat generated from nuclear fission in a reactor is cooled by He gas, with uranium dioxide (UO{sub 2} is globally used) used as fuel for the nuclear fission. Generally, nuclear fuel used in a HTGR is fabricated into a TRISO (TRi.ISOtropic) structure that can prevent the leakage of nuclear fission products at high temperatures.

  12. Screening of mucoadhesive vaginal gel formulations

    Directory of Open Access Journals (Sweden)

    Ana Ochoa Andrade

    2014-12-01

    Full Text Available Rational design of vaginal drug delivery formulations requires special attention to vehicle properties that optimize vaginal coating and retention. The aim of the present work was to perform a screening of mucoadhesive vaginal gels formulated with carbomer or carrageenan in binary combination with a second polymer (carbomer, guar or xanthan gum. The gels were characterised using in vitroadhesion, spreadability and leakage potential studies, as well as rheological measurements (stress and frequency sweep tests and the effect of dilution with simulated vaginal fluid (SVF on spreadability. Results were analysed using analysis of variance and multiple factor analysis. The combination of polymers enhanced adhesion of both primary gelling agents, carbomer and carrageenan. From the rheological point of view all formulations presented a similar behaviour, prevalently elastic and characterised by loss tangent values well below 1. No correlation between rheological and adhesion behaviour was found. Carbomer and carrageenan gels containing the highest percentage of xanthan gum displayed good in vitro mucoadhesion and spreadability, minimal leakage potential and high resistance to dilution. The positive results obtained with carrageenan-xanthan gum-based gels can encourage the use of natural biocompatible adjuvants in the composition of vaginal products, a formulation field that is currently under the synthetic domain.

  13. Two-dimensional gel isoelectric focusing

    Czech Academy of Sciences Publication Activity Database

    Šťastná, Miroslava; Šlais, Karel

    2005-01-01

    Roč. 26, č. 18 (2005), s. 3586-3591 ISSN 0173-0835 R&D Projects: GA AV ČR IAA4031302; GA AV ČR IBS4031201 Institutional research plan: CEZ:AV0Z40310501 Keywords : gel isoelectric focusing * pI markers * proteins Subject RIV: CB - Analytical Chemistry, Separation Impact factor: 3.850, year: 2005

  14. Effectiveness of Gel Repellents on Feral Pigeons

    Directory of Open Access Journals (Sweden)

    Birte Stock

    2013-12-01

    Full Text Available Millions of feral pigeons (Columba livia live in close association with the human population in our cities. They pose serious health risks to humans and lead to high economic loss due to damage caused to buildings. Consequently, house owners and city authorities are not willing to allow pigeons on their buildings. While various avian repellents are regularly introduced onto the market, scientific proof of efficacy is lacking. This study aimed at testing the effectiveness of two avian gel repellents and additionally examined their application from animal welfare standpoint. The gels used an alleged tactile or visual aversion of the birds, reinforced by additional sensory cues. We mounted experimental shelves with the installed repellents in a pigeon loft and observed the behavior of free-living feral pigeons towards the systems. Both gels showed a restricted, transient repellent effect, but failed to prove the claimed complete effectiveness. Additionally, the gels’ adhesive effect remains doubtful in view of animal welfare because gluing of plumage presents a risk to feral pigeons and also to other non-target birds. This study infers that both gels lack the promised complete efficacy, conflict with animal welfare concerns and are therefore not suitable for feral pigeon management in urban areas.

  15. Gels and microgels for nanotechnological applications.

    Science.gov (United States)

    Fernández-Barbero, Antonio; Suárez, Iván J; Sierra-Martín, B; Fernández-Nieves, A; de Las Nieves, F Javier; Marquez, Manuel; Rubio-Retama, J; López-Cabarcos, Enrique

    2009-01-01

    In recent years, "smart" materials have been the focus of considerable interest, from both fundamental and applied perspectives. Polymer gels are within this category; they respond to specific environmental stimuli by changing their size. Thus, the internal structure, the refractive index, and the mechanical properties of the polymer network change. They are considered super absorbent materials, as they can absorb solvent up to several hundred times their own weight. They respond rapidly to local environmental variations, an important fact in device miniaturization and microsensor developments. As size changes are accompanied by changes in internal dimensions, microgels have found application as carriers of therapeutic drugs and as diagnostic agents. They have also been used as microreactors, optically active materials, for template synthesis of nanoparticles or fabrication of artificial muscle. In this paper we review a set of application based on the special features associated to this systems. Basic concepts on the physical-chemistry of gel swelling is first described, followed by different applications covering drug delivery, composite materials using polymer gels to modulate optical or magnetic and electrical properties, molecular imprinting, gel-based biosensors and polymer sensors and actuators used in the field of artificial muscles.

  16. Sol-Gel Derived Hafnia Coatings

    Science.gov (United States)

    Feldman, Jay D.; Stackpoole, Mairead; Blum, Yigal; Sacks, Michael; Ellerby, Don; Johnson, Sylvia M.; Venkatapathy, Ethiras (Technical Monitor)

    2002-01-01

    Sol-gel derived hafnia coatings are being developed to provide an oxidation protection layer on ultra-high temperature ceramics for potential use in turbine engines (ultra-efficient engine technology being developed by NASA). Coatings using hafnia sol hafnia filler particles will be discussed along with sol synthesis and characterization.

  17. Formulation of Bioadhesive Carbomer Gel Incorporating Drug ...

    African Journals Online (AJOL)

    Purpose: To formulate carbomer gel to localize and target drug action in periodontal pockets. Methods: Diclofenac sodium (DS, anti-inflammatory) and metronidazole hydrochloride (MH, antibacterial) were loaded in gelatin microspheres using glutaraldehyde cross-linking. The microspheres were evaluated for drug loading, ...

  18. Sol–gel processing of carbidic glasses

    Indian Academy of Sciences (India)

    Unknown

    The endothermic peak and weight loss below. 200°C are associated with condensation reactions and evaporation of reaction products and residual water. The extent of these have been found to be lower than those for pure silica gels. The weight loss after 400°C is assigned to condensation of silanol groups and formation ...

  19. Fluorescence metrology of silica sol-gels

    Indian Academy of Sciences (India)

    We have developed a new method for measuring in-situ the growth of the nanometre-size silica particles which lead to the formation of sol-gel glasses. This technique is based on the decay of fluorescence polarisation anisotropy due to Brownian rotation of dye molecules bound to the particles. Results to date give near ...

  20. Optimization in the use of energy in a petrochemical process; Optimizacion del uso de la energia en un proceso petroquimico

    Energy Technology Data Exchange (ETDEWEB)

    Picon Nunez, M. [Instituto de Investigaciones Cientificas, Universidad de Guanajuato, Guanajuato (Mexico); Quillares Vargas, L. [Tecnopinch, S.A. de C.V., Mexico, D. F. (Mexico); Torres Reyes, E. [Instituto de Investigaciones Cientificas, Universidad de Guanajuato, Guanajuato (Mexico)

    1997-12-31

    This paper presents the results of a study to reduce the energy consumption in a section of a dimethyl terephthalate plant. A thermal analysis was performed to evaluate the opportunities in energy saving. It was found that the plant operates with a high level of energy integration, that is, the maximum amount of heat is recovered by the generation of steam that is utilized in other sections of the plant. Nevertheless, the process design is such that an important part of the heating potential of this steam is lost due to the expansion it is subjected to adjust its pressure to the distribution header pressure which in this way limits its optimum usage. A proposal is also presented to reduce the losses of potential and the overall consumption of energy in approximately 5 millions of Btu/hr. [Espanol] En este trabajo se muestran los resultados de un estudio para reducir el consumo de energia en una seccion de una planta de dimetil tereftalato. Se realizo un analisis termico para evaluar las oportunidades de ahorro de energia. Se encontro que la planta opera con un alto nivel de integracion energetica, es decir, se recupera la maxima cantidad de calor en forma de vapor y se reutiliza en otras secciones de la planta. Sin embargo, el diseno del proceso es tal que una fraccion importante del potencial de calentamiento de este vapor se pierde debido a la expansion a que es sometido para ajustar su presion a la del cabezal de distribucion, limitando de esta manera su uso optimo. Se presenta una propuesta para reducir las perdidas de potencial y reducir el consumo global de energia en aproximadamente 5 millones de Btu/hr.

  1. Electrical energy measurement under free market schemes; Medicion de la energia electrica bajo esquemas de libre mercado

    Energy Technology Data Exchange (ETDEWEB)

    Zapata Garcia, Juan A. [Comision Federal de Electricidad (Mexico); Vidrio Lopez, Gilberto; Gomez Lopez, Jose M.; Mijarez Castro, R. [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    The energy markets deregulation brings new opportunities and challenges, for the companies of electricity as well as for the consumers. The transaction of electricity in an open market requires of well informed participants to analyze the market conditions, they need to know how much energy is consumed, in what time and in what point of the electrical circuits. The lack of a good measurement system is one of the main barriers that prevent the participants to benefit from the opportunities of an open market. In this article the more representative schemes of measurement of the state of art in schemes of free market are exposed, their technological capacities and technologies behind them. It is also mentioned the measurement facilities, control centers, energy quality and technological tendencies. [Spanish] La desregulacion de los mercados de energia trae nuevas oportunidades y retos, tanto para la companias de electricidad como para los consumidores. La compra-venta de electricidad en un mercado abierto requiere de participantes bien informados para analizar las condiciones del mercado, estos necesitan conocer cuanta energia se consume, en que tiempo y en que lugar de los circuitos electricos. La falta de un buen sistema de medicion es una de las principales barreras que impide a los participantes beneficiarse de las oportunidades de un mercado abierto. En este articulo se exponen los esquemas de medicion mas representativos del estado de la practica en esquemas de libre mercado, sus capacidades y tecnologias detras de ellos. Tambien se habla sobre las instalaciones de medicion centros de control, calidad de energia y tendencias tecnologicas.

  2. Sistemas híbrido de produção de energia para sistema de comunicações rádio

    OpenAIRE

    Carreiras, José Manuel Patrício

    2014-01-01

    Mestrado em Sistemas de Energias Renováveis na Escola Superior de Tecnologia e Gestão do Instituto Politécnico de Viana do Castelo Este trabalho de projeto incidiu sobre o dimensionamento de cinco sistemas Autónomos de produção de energia para alimentação de Pontos repetidores do sistema de comunicação e sua implementação. O presente trabalho iniciou-se em 2006 quando por motivos profissionais foi necessário construir um sistema de comunicação de suporte ao sistema de telegestã...

  3. Sistema imunológico artificial para predição de fraudes e furtos de energia elétrica

    OpenAIRE

    Mauricio Volkweis Astiazara

    2012-01-01

    Neste trabalho é analisada a aplicação da técnica de Sistemas Imunológicos Artificiais (SIA) a um problema do mundo real: como predizer fraudes e furtos de energia elétrica. Vários trabalhos tem mostrado que épossível detectar padrões de dados anormais a partir dos dados de consumidores de energia elétrica e descobrir problemas como fraude e furto. Sistemas Imunológicos Artificiais é um ramo recente da Inteligência Computacional e tem diversas possíveis aplicações, sendo uma delas o reconheci...

  4. APLICAÇÃO DA ENERGIA HIDRELÉTRICA EM UMA SALA DE AULA BUSCANDO A ECONOMIA NA FORMA DO CONSUMO

    Directory of Open Access Journals (Sweden)

    Marcelo Mateus Rieger

    2011-07-01

    Full Text Available Após a revolução industrial, com o êxodo rural, houve um grande crescimento populacional urbano trazendo consigo o aumento no consumo elétrico e consequentemente necessitando de uma maior demanda de produção de energia. Em meio a essa evolução, tornou-se essencial a construção de mais fontes geradoras de energia elétrica, causando diversos impactos ambientais. Atualmente a criação de programas de conservação buscando métodos para a redução do consumo de energia, visa adotar novos estilos de vida e padrões de consumo o que vem sendo um grande desafio a todos. Segundo PUCRS (2010, p.05. um programa de conservação e uso racional de energia consiste em uma série de ações e medidas de caráter técnico, gerencial e comportamental, que visam a diminuir o consumo de energia e buscam a sustentabilidade. Neste projeto serão citadas algumas maneiras de redução de consumo de energia elétrica em uma sala de aula da escola Osvaldo Crus, sendo esta energia proveniente de usina hidrelétrica. “[...] A maior e mais potente usina hidroelétrica do mundo, é a Usina Itaipu, localizada na fronteira entre Brasil e Paraguai, ela é capaz de produzir 90000 giga watts por ano, o suficiente para alimentar a cidade de Londres por 3 anos.” ( GIGANTES DA ENGENHARIA, 2009. A conscientização de todo o corpo acadêmico do colégio Osvaldo Cruz é de fundamental importância para a realização desse projeto, desde um simples gesto como desligar as luzes quando o ambiente não estiver sendo utilizado, fechar todo o ambiente ao ligar o condicionador de ar, entre outros, sendo que isto trará melhorias e benefícios para todos, já que reduzindo o consumo de energia, indiretamente estaremos reduzindo os níveis de impactos ambientais.

  5. "Avaliação ambiental de diferentes formas de geração de energia elétrica"

    OpenAIRE

    Ana Maria de Oliveira Guena

    2007-01-01

    No mundo moderno a energia elétrica tem um papel fundamental; ela é a base do progresso e desenvolvimento mundial. O seu surgimento propiciou a melhora no saneamento, na saúde, no abastecimento de água e alimentos, na qualidade de vida e também fez surgir a sociedade capitalista e de consumo. A utilização do petróleo como fonte geradora de energia foi o impulso da revolução industrial e através dele foram desenvolvidos motores, geradores e máquinas que contribuíram para o progresso. Com isto...

  6. Gira-sol fotovoltaic : Seguidor solar automàtic per a la captació de l'energia del sol

    OpenAIRE

    García Fortanet, Javier

    2016-01-01

    L'energia solar fotovoltaica podria convertir-se en un dels recursos energètics emergents més importants al món. Però, el seu cost de producció és un dels principals inconvenients que encara fan difícil la seva viabilitat com una font d'energia competitiva amb altres sistemes de producció energètica convencionals. Les estratègies de desenvolupament d'aquesta tecnologia es concentren principalment en l'abaratiment de les cel·les fotovoltaiques i l'augment del rendiment de les instal·lacions de...

  7. Altervative energy sources, principles, applications, state of the art and perspectives; Fuentes alternativas de energia, principios, aplicaciones, estado del arte y perspectivas

    Energy Technology Data Exchange (ETDEWEB)

    Saldana Flores, R; Gonzalez Galarza, R.; Ramos Berumen, C.; Agredano Diaz, J.; Arvizu Fernandex, J.L. [Instituto de Investigaciones Electricas (Mexico); Saldana Flores, R.; Gonzalez Galarza, R.; Ramos Berumen, C.; Agredano Diaz, J.; Arvizu Fernandez, J.L. [Instituto de Investigaciones Electricas (Mexico)

    1996-12-31

    All over the world, the energy availability has turned out to be one of the most important problems. The greatest majority of countries, developing as well as industrialized countries are being affected by the increasing demand of energy to satisfy their social and economic development goals and the need of complementing the conventional sources of energy with the non-conventional sources has become imperative for most of them. Beginning the last decade, it has been recognized the inevitability that in a non too far future the energy supply will suffer a transitional change from its present oil dependency towards more diversified energy combinations. This transition that involves the development of a variety of energy sources, with preference to the renewable sources, represents an important technological challenge that has to be attained in a gradual and orderly fashion. Among the new energy forms and the new technologies to obtain energy that have been considered to become a part of the energy supply in the future are the so called non-conventional sources of energy (NCSE) or alternative sources of energy, such as solar, biomass, wind power and small hydro stations. [Espanol] A nivel mundial, la disponibilidad de energia se ha convertido en uno de los problemas ms importantes. La gran mayoria de los paises, tanto en desarrollo como industrializados, se ven afectados por demandas crecientes de energia para satisfacer sus metas de desarrollo econonico y social, y la necesidad de complementar las fuentes comerciales con fuentes no convencionales se ha vuelto imperativa para la mayoria de ellos. A partir de la ultima decada, se ha reconocido como inevitable que en un futuro no muy lejano la oferta de energa debera sufrir una transicin desde su actual dependencia de los hidrocarburos hacia combinaciones energeticas mas diversificadas. Esta transicion que implica lograr el aprovechamiento de una variedad de fuentes de energia, prestando particular atencion a los

  8. (3-Mercaptopropyl)trimethoxysilane-derived Porous Gel Monolith via Thioacetal Reaction-Assisted Sol-Gel Route

    Energy Technology Data Exchange (ETDEWEB)

    Ito, S; Nishi, M; Kurahashi, T; Matsubara, S; Shimotsuma, Y; Miura, K; Hirao, K [Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan); Kanamori, K; Nakanishi, K, E-mail: west@collon1.kuic.kyoto-u.ac.jp [Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502 (Japan)

    2011-10-29

    Porous gel monolith was synthesized by reacting (3-mercaptopropyl)trimethoxysilane (MPTMS) with acetone on acidic conditions. It is known that MPTMS itself is difficult to turn into gel on acidic conditions and instead oligomers are obtained owing to the large mercaptopropyl group. In our system, the gels were obtained since acetone worked as a cross-linker via thioacetal reaction. Additionally, Au ions were selectively adsorbed on the obtained gel. When an obtained white gel was soaked in a chloroauric acid solution, the gel turned brown and was getting dark depending on the soaked time; on the other hand, the color of the solution turned from yellow to colorless.

  9. Normal modes of weak colloidal gels

    Science.gov (United States)

    Varga, Zsigmond; Swan, James W.

    2018-01-01

    The normal modes and relaxation rates of weak colloidal gels are investigated in calculations using different models of the hydrodynamic interactions between suspended particles. The relaxation spectrum is computed for freely draining, Rotne-Prager-Yamakawa, and accelerated Stokesian dynamics approximations of the hydrodynamic mobility in a normal mode analysis of a harmonic network representing several colloidal gels. We find that the density of states and spatial structure of the normal modes are fundamentally altered by long-ranged hydrodynamic coupling among the particles. Short-ranged coupling due to hydrodynamic lubrication affects only the relaxation rates of short-wavelength modes. Hydrodynamic models accounting for long-ranged coupling exhibit a microscopic relaxation rate for each normal mode, λ that scales as l-2, where l is the spatial correlation length of the normal mode. For the freely draining approximation, which neglects long-ranged coupling, the microscopic relaxation rate scales as l-γ, where γ varies between three and two with increasing particle volume fraction. A simple phenomenological model of the internal elastic response to normal mode fluctuations is developed, which shows that long-ranged hydrodynamic interactions play a central role in the viscoelasticity of the gel network. Dynamic simulations of hard spheres that gel in response to short-ranged depletion attractions are used to test the applicability of the density of states predictions. For particle concentrations up to 30% by volume, the power law decay of the relaxation modulus in simulations accounting for long-ranged hydrodynamic interactions agrees with predictions generated by the density of states of the corresponding harmonic networks as well as experimental measurements. For higher volume fractions, excluded volume interactions dominate the stress response, and the prediction from the harmonic network density of states fails. Analogous to the Zimm model in polymer

  10. Ultraviolet absorption detection of DNA in gels

    International Nuclear Information System (INIS)

    Mahon, A.R.

    1998-01-01

    A method and apparatus for the detection and quantification of large fragments of unlabelled deoxyribonucleic acid (DNA) in agarose gels is presented. The technique is based on ultra-violet (UV) absorption by nucleotides. A deuterium lamp was used to illuminate regions of an electrophoresis gel. As DNA bands passed through the illuminated region of the gel the amount of UV light transmitted was reduced due to DNA absorption. Two detection systems were investigated. In the first system, synthetic chemical vapour deposition (CVD) diamond strip detectors were used to locate regions of DNA in the gels by detecting the transmitted light. CVD diamond has a high indirect band gap of 5.45 eV and is therefore sensitive to UV photons of wavelengths < 224 nm. A number of CVD diamond samples were characterised to investigate their suitability as detectors for this application. The detectors' quantum efficiency, UV response and time response were measured. DNA bands containing as little as 20 ng were detected by the diamond. In a second system, a deuterium lamp was used to illuminate individual sample lanes of an electrophoresis gel via an array of optical fibres. During electrophoresis the regions of DNA were detected with illumination at 260 nm, using a UV-sensitive charge coupled device (CCD). As the absorption coefficient of a DNA sample is approximately proportional to its mass, the technique is inherently quantitative. This system had a detection limit of 0.25 ng compared with 2-10 ng for the most popular conventional technique, ethidium bromide (EtBr) staining. Using this detection technique, the DNA sample remains in its native state. The removal of carcinogenic dyes from the detection procedure greatly reduces associated biological hazards. (author)

  11. Chicago World’s Columbian Exposition: e os embates sobre energia elétrica observados por um brasileiro

    Directory of Open Access Journals (Sweden)

    Sérgio Dyego Baldez Cesar

    2016-12-01

    Full Text Available Este trabalho tem como objetivo analisar a exposição internacional de Chicago, ocorrida na data de 1893, tendo como principal foco as observações de um brasileiro que visitou o evento e publicou uma materia na revista industrial de Minas Gerais, matéria esta totalmente inclinada para a área de inovações em energia elétrica que ocoreram neste evento. Desta forma fazendo uma pequena observação da circularidade de conhecimento existente no final do século XIX.

  12. Experiences of energy saving and co-generation projects; Experiencias de proyectos de ahorro de energia y cogeneracion

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez Barajas, Alberto [Heat and Power Systems, S.A. de C.V., Mexico D.F. (Mexico)

    2005-07-01

    In this document are presented the successful projects of energy saving and co-generation that Heat and Power Systems, S.A. de C.V. has made in diverse industries. The investment recovery periods have been smaller to 18 months. The projects have been made for different companies within Mexican Republic. [Spanish] Se presentan los casos exitosos de proyectos de ahorro de energia y cogeneracion que Heat and Power Systems, S.A. de C.V. ha realizado en diversas industrias cuyo periodo de recuperacion de la inversion han sido menores a 18 meses. Los proyectos han sido realizados para distintas empresas dentro de la Republica Mexicana.

  13. Uma introdução aos métodos de cálculo da energia de Casimir

    Directory of Open Access Journals (Sweden)

    Passos Sobrinho J.J.

    2001-01-01

    Full Text Available O efeito Casimir é um dos aspectos mais intrigantes da física moderna. A previsão da existência de uma força macroscópica de origem quântica entre condutores neutros e sua posterior comprovação experimental é sem dúvida um dos triunfos da teoria quântica dos campos. Complementando uma introdução conceitual publicada recentemente nesta revista, apresentamos alguns métodos de cálculo da energia de Casimir, que é a grandeza fundamental que origina o efeito Casimir.

  14. Integração de sistemas de energia renovável a instalações residenciais

    OpenAIRE

    Marujo, R.; Simões, T.; Estanqueiro, Ana

    2010-01-01

    Os sistemas de microgeração domésticos que produzem energia a partir de fontes renováveis necessitam de legislação especifica e de ferramentas para identificar os potenciais e a viabilidade de implantação de soluções tecnológicas adaptadas ao ambiente urbano. Este artigo analisa exemplos de implementação de sistemas eólicos, fotovoltaicos e híbridos em uma edificação, debatendo questões económicas e energéticas.

  15. Energia e sustentabilidade a nível de bairro - caso de estudo do bairro do Charquinho

    OpenAIRE

    Gutierres, Fábio Miguel Teixeira

    2012-01-01

    Dissertação para obtenção do Grau de Mestre em Engenharia do Ambiente - Perfil de Ordenamento do Território e Impactes Ambientais A grande dependência em combustíveis fósseis, aliada a um uso ineficiente de energia, produz efeitos nefastos no ambiente, como as alterações climáticas, que tem constituído um desafio internacional e que a todos diz respeito, incluindo Portugal. Portugal é um país com escassos recursos energéticos endógenos, nomeadamente, aqueles que asseguram a generalidade...

  16. Technological tendencies and their relation with energy markets; Tendencias tecnologicas y su relacion con mercados de energia

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Castro, Salvador [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    In this article some associate technological tendencies with areas of interest of the Control Systems Division of the Instituto de Investigaciones Electricas (IIE) are presented. Here the relations or influence that these tendencies have and will continue having in the future with the definition and implantation of energy markets are mentioned. [Spanish] En este articulo se presentan algunas tendencias tecnologicas asociadas con areas de interes de la Division de Sistemas de Control del Instituto de Investigaciones Electricas (IIE). Aqui se mencionan las relaciones o influencia que dichas tendencias tienen y continuaran teniendo en el futuro con la definicion e implantacion de mercados de energia.

  17. Cost-benefit of energy saving in bioclimatic designs; Costo-beneficio del ahorro de energia en los disenos bioclimatios

    Energy Technology Data Exchange (ETDEWEB)

    Lopez P, J. Manuel A. [Doble dos soluciones de Negocios (Mexico); Morillon G, David; Rdriguez V, Luis [Universidad Autonoma de Mexico (Mexico)

    2001-06-01

    Tools and criteria for Cost-Benefit Analysis (ACB) of energy saving in bioclimatic designs (DB) are presented, for which a reference project is established. Based on the traditional design of air conditioning of a building and with the support of this one, the estimation of costs and benefits of the same building is made; but with passive systems. The tools used consider related resources such as time and money. Criteria are used such as: Present value (VP), Equivalent Annual Cost (EAC) and the Cost of the conserved Energy (CEC). The costs related to the construction, maintenance and operation of the design are taken into consideration. The differences between the design of reference and the Bioclimatic Design, established from the application of these criteria, allow evaluating the economic margin as far as operation and maintenance. Finally, the cost of the conserved energy of the bioclimatic measures is evaluated as an initiative for energy saving and calculates the present value from them in all of the period of useful life of the bioclimatic design. [Spanish] Se presentan herramientas y criterios para el analisis Costo-Beneficio (ACB) del ahorro de energia en los disenos bioclimaticos (DB), para lo cual se establece un proyecto de referencia. Basado en el diseno tradicional de la climatizacion de un edificio y con apoyo en este, se realiza la estimacion de costos y beneficios del mismo edificio; pero con sistema pasivos. Las herramientas usadas consideran recursos relacionados como son tiempo y dinero. Se usan criterios tales como: Valor Presente (VP), Costo Anual Equivalente (CAE) y el Costo de la Energia conservada (CEC). Se toman en consideracion los costos relacionados con la construccion, mantenimiento y operacion del diseno. Las diferencias entre el diseno de referencia y el Diseno Bioclimatico, establecidas a partir de la aplicacion de estos criterios, permiten evaluar el margen economico en cuanto a la operacion y el mantenimiento. Finalmente, se

  18. Sol-Gel Synthesis of Au-Nanoparticle Dispersed Bicontinuous Macroporous Siloxane Gel

    Energy Technology Data Exchange (ETDEWEB)

    Hamada, Y; Nishi, M; Shimotsuma, Y; Miura, K; Hirao, K, E-mail: west@collon1.kuic.kyoto-u.ac.jp [Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510 (Japan)

    2011-10-29

    We synthesized Au-nanoparticle dispersed siloxane gel with well-defined bicontinuous macroporous morphologies. We employed methyltrimethoxysilane (MTMS) as a precursor of the gel skeleton, and also employed hydrogen tetrachloroaurate(III) as both a precursor of Au nanoparticles and an acid catalyst for hydrolysis/condensation of methoxysilanes. The effect of adding (3-mercaptopropyl)trimethoxysilane (MPTMS) as a starting material on the obtained structure was also investigated. It is found that Au nanoparticles of 20-30 nm in grain size are uniformly dispersed on the gel surface in the system containing MPTMS; in contrast, Au nanoparticles assembled in the pits in the MPTMS-free system. All the heat-treated MPTMS-containing gels showed surface plasmon absorption, and the peaks shifted from 550 to 520 nm with increasing the calcination temperature.

  19. Competitive policies in the Nordic energy research and innovation area - eNERGIA : Synthesis report

    Energy Technology Data Exchange (ETDEWEB)

    Klitkou, Antje; Pedersen, Trond Einar; Scordato, Lisa; Mariussen, Aage

    2008-07-01

    This report outlines the energy research and innovation policy in the Nordic and Baltic countries - Denmark, Finland, Iceland, Norway, Sweden, Estonia, Latvia and Lithuania. The report is the result of the research project Competitive policies in the Nordic Energy Research and Innovation Area (eNERGIA). The project was co-funded by Nordic Energy Research and NIFU STEP. The objective of the project was to determine possible policy interventions targeted at the development and commercial promotion of promising renewable energy production technologies in the Nordic countries. The report is based on an analysis of the framework conditions for the sector innovation systems for energy production, with a focus on research and innovation policy in the Nordic and Baltic countries. We identified the key actors and institutions in all the eight countries studied. In addition, we conducted a performance assessment based on the quantitative indicators of publishing and patenting, international collaboration and funding data. Using these indicators as a basis, we conducted an analysis of the strengths, weaknesses, opportunities and threats (SWOT analysis) of the Nordic sector innovation systems for energy production. This analysis identified common or diverging characteristics, challenges, framework conditions, energy-technology specialisation and, most important of all, cases of good practice in key technologies. The project included two workshops, and the results of these are also reported here. The outcomes of the workshops have been used in several parts of the project: A Nordic workshop on the environmental consequences of deployment at scale of these technologies to replace existing energy systems, with a focus on wind energy and photovoltaic energy, carbon dioxide capture and storage, and second-generation bioenergy. A Nordic workshop on policy implications for Nordic Energy Research. The report comprises three parts: Part 1: Country reports Part 2: Technology reports

  20. Natural ionizing system to electrical protection and energy; Sistema ionizante natural de proteccion electrica y energias

    Energy Technology Data Exchange (ETDEWEB)

    Cabareda Fermin; Luis [Universidad de Los Andes (Venezuela)]. E-mail: lcabaredaf@gmail.com

    2013-03-15

    This is the new highest technology, 100% Venezuelan and unique in the world, technological innovation, world patent for maximum protection, security and zero risk (0) to all electrical and power generation systems: hydroelectric and thermoelectric power plants, wind, nuclear and solar power plants, etc; it's the only technology around the world that has the potential to disperse and propagate to land mass the enormous energies associated to the atmospheric discharges (lightning), which are in the order: 200,000 to 500,000 Amperes; 1,000 million Kilowatts and high-level transient voltage of 100 million Volts. This new high technology is the solution to the paradigm of Benjamin Franklin and it is the mechanism to end blackouts that produce so many damages and losses of billions of dollars to both generators and users of electrical service, throughout the world. [Spanish] Esta nueva mas alta tecnologia, 100% venezolana y unica en el mundo, innovacion tecnologica, patente mundial ofrece maxima proteccion, seguridad y riesgo cero (0) a todos los sistemas de generacion electrica: centrales hidroelectricas, termoelectricas, de viento, nucleares y solar, otros; es la unica tecnologia en el mundo que tiene el potencial para dispersar y propagar a la masa terrestre las enormes energias asociadas a las descargas atmosfericas (rayos) que estan en el orden de: 200.000 a 500.000 amperios, 1.000 millones de kilovatios y voltajes transitorios de alto nivel de 100 millones de voltios. Esta nueva alta tecnologia es la solucion al paradigma de Benjamin Franklin y es el mecanismo para eliminar apagones que producen danos y perdidas de billones de dolares para ambos: generados y usuarios del servicio electrico, alrededor del mundo.

  1. Saving of electrical energy in educative institutions; Ahorro de energia electrica en instituciones educativas

    Energy Technology Data Exchange (ETDEWEB)

    Castillo Medina, Gabino [Instituto Tecnologico y de Estudios Superiores de Monterrey Campus Estado de Mexico, (Mexico)

    2003-07-01

    The present work looks for integrating the actions of energy saving that can be applied in educative institutions, not concerning the level or size of the same ones. The actions go from questions of making aware the student population until those involved in the change in the operation, migration and implementation of technology. Without overlooking the formative aspect that the educative institutions have and the social commitment of these last ones. It is important that the saving measures have as mission to achieve a culture focussed to make efficient use of the resources, of energy as well as material. This culture must be born from the classrooms and must transform the way to be and act of the student community that will permeate itself with the society. Let us remember that actions are worth more than words, so the educative institutions must preach with the example. [Spanish] El presente trabajo busca integrar las acciones de ahorro de energia que pueden ser aplicadas en instituciones educativas, no importando el nivel o tamano de las mismas. Las acciones van desde cuestiones de concienciar a la poblacion estudiantil hasta las que involucran el cambio en la operacion, migracion e implementacion de tecnologia. Sin perder de vista el aspecto formativo que tienen las instituciones educativas y el compromiso social de estas ultimas. Es importante que las medidas de ahorro tengan como mision lograr una cultura enfocada a hacer uso eficiente de los recursos, tanto energeticos como materiales. Dicha cultura debe nacer desde las aulas y debe transformar la manera de ser y actuar, de la comunidad estudiantil que se permeara con la sociedad. Recordemos que las acciones valen mas que las palabras, asi que las instituciones educativas deben predicar con el ejemplo.

  2. Gel polymer electrolytes based on PMMA III. PMMA gels containing cadmium

    Czech Academy of Sciences Publication Activity Database

    Vondrák, Jiří; Sedlaříková, M.; Velická, Jana; Klápště, Břetislav; Novák, V.; Reiter, Jakub

    2003-01-01

    Roč. 48, č. 8 (2003), s. 1001-1004 ISSN 0013-4686 R&D Projects: GA AV ČR IAA4032002; GA ČR GA104/02/0731; GA MŠk ME 216 Institutional research plan: CEZ:AV0Z4032918; CEZ:MSM 262200010 Keywords : gel polymer electrolytes * polymethylmethacrylate * cadmium gel electrolyte Subject RIV: CA - Inorganic Chemistry Impact factor: 1.996, year: 2003

  3. Eficiência de utilização da energia metabolizável para mantença e ganho de peso e exigências de energia metabolizável e de nutrientes digestíveis totais de bovinos Nelore, não-castrados Efficiency of metabolizable energy utilization for maintenance and weight gain and requirements of metabolizable energy and total digestible nutrients of Nellore bulls

    Directory of Open Access Journals (Sweden)

    Antonia Sherlânea Chaves Véras

    2001-06-01

    Full Text Available Este trabalho foi conduzido para estimar as eficiências de utilização da energia metabolizável (EUEM para mantença (km e ganho de peso (kf e as exigências de energia metabolizável (EM e nutrientes digestíveis totais (NDT de bovinos Nelore, não-castrados. Utilizaram-se 35 animais com idade e peso médios de 20 meses e 330 kg. Após período de adaptação (40 dias, cinco animais foram abatidos para servir como referência; os demais foram distribuídos, em delineamento inteiramente casualizado, nos tratamentos (12,5; 25,0; 37,5; 50,0; 62,5; e 75,0% de concentrado com base na matéria seca. A estimativa das kf foi efetuada a partir da regressão entre os teores de energia líquida para ganho, em função da EM da dieta, e também agrupando-se os dados relativos aos animais do presente trabalho e os referentes a 29 bovinos F1 Simental x Nelore. As kf também foram estimadas como o coeficiente da regressão linear entre a energia retida (ER e o consumo de EM (CEM. A km estimada foi de 0,56. As kf estimadas utilizando-se a primeira metodologia foram de 0,45; 0,35; 0,54; 0,50; e 054, respectivamente, para as concentrações de 2,11; 2,35; 2,51; 2,59; e 2,52 Mcal/kg de MS. As kf estimadas por meio da segunda metodologia foram 0,32; 0,33; 0,44; 0,49; e 0,69, respectivamente. Os requisitos de EM e NDT para mantença de um animal pesando 400 kg de PV foram de 11,94 Mcal/kgGPCVZ e 3,30 kg/kgGPCVZ, respectivamente; enquanto para ganho de peso, os requisitos para dietas com 2,4 Mcal/kg de MS, foram 9,84 Mcal/kg GPCVZ e 2,72 kg/GPCVZ. Para dietas com concentração de EM de 2,6 Mcal/kg de MS, os requerimentos de EM e NDT foram, respectivamente, 7,28 Mcal/kg GPCVZ e 2,01 kg/GPCVZ.This work was carried out to estimate the efficiency of metabolizable energy utilization (EMEU for maintenance (km and weight gain (kf and the requirements of metabolizable energy (ME and total digestible nutrients (TDN of Nellore bulls. Thirty-five animals, averaging 330 kg

  4. Simplified riboprobe purification using translucent straws as gel tubes.

    Science.gov (United States)

    Kol, S; Ben-Shlomo, I; Adashi, E Y; Rohan, R M

    1996-01-01

    Gel purification of radioactive riboprobes enhances the quality of the ribonuclease protection assay. A simple and effective method for riboprobe purification is described. The method uses acrylamide gels in plastic tubes to achieve electrophoretic separation of the RNA polymerase products.

  5. Accumulation of humic acid in DET/DGT gels

    Digital Repository Service at National Institute of Oceanography (India)

    Van der Veeken, P.L.R.; Chakraborty, P.; Van Leeuwen, H.P.

    in Thin film) that these natural complexing agents do enter the gel layer, and that humic acids even appear to accumulate in the gel, with enrichment factors typicallyonthe order of 10. The results have consequences for the interpretation of DGT...

  6. Study of nuclear glasses alteration gel and synthesis of some model gels

    International Nuclear Information System (INIS)

    Ricol, S.

    1995-01-01

    This work deals with the general problem of alteration of the reference nuclear glass R7T7. Attention is paid particularly to the altered layer formed at the glass surface during alteration process. In opposition to previous works, related essentially to glass dissolution kinetics based on chemical analyses of lixiviated elements, this thesis deals with alteration problems through structural studies of the reference glass and derived gel. This approach allows the determination of mechanisms for the gel formation and a better understanding of the behaviour of glasses towards lixiviation. Both approaches appeared complementary. Based on several spectroscopic techniques, this work showed the particular role of cations such as calcium, zirconium and iron. Studies of silica-based synthetic gels showed the synergic effect of formers cation and of one highly coordinated cation. The variation of the wavenumber related to Si-O-Si asymmetric stretching vibration can be correlated to O/Si ratio for ternary systems Si/Na/Zr. On the contrary, the Si losses of the materials depend on the number of non-bridging oxygen atoms. In the perspective of long-term behaviour, the alteration gel presents better characteristics than initial glass. It is therefore a highly stable material in static conditions. In the same way, synthetic gels are materials with very low solubilities (much lower than the alteration gel) and could be used as confining matrices. (authors). refs., 71 figs., 37 tabs

  7. Establishment of gel materials with different mechanical properties by 3D gel printer SWIM-ER

    Science.gov (United States)

    Ota, Takafumi; Tase, Taishi; Okada, Koji; Saito, Azusa; Takamatsu, Kyuuichiro; Kawakami, Masaru; Furukawa, Hidemitsu

    2016-04-01

    A 3D printer is a device which can directly produce objects whose shape is the same as the original 3D digital data. Hydrogels have unique properties such as high water content, low frictional properties, biocompatibility, material permeability and high transparency, which are rare in hard and dry materials. These superior characteristics of gels promise useful medical applications. We have been working on the development of a 3D gel printer, SWIM-ER (Soft and Wet Industrial - Easy Realizer), which can make models of organs and artificial blood vessels with gel material. However, 3D printing has a problem: the mechanical properties of the printed object vary depending on printing conditions, and this matter was investigated with SWIM-ER. In the past, we found that mechanical properties of 3D gel objects depend on the deposition orientation in SWIM-ER. In this study, gels were printed with different laser scanning speeds. The mechanical properties of these gels were investigated by compression tests, water content measurements and SMILS (Scanning Microscopic Light Scattering).

  8. Determinação do fluxo de seiva na cana-de-açúcar pelo método do balanço de energia caulinar Sugarcane sap flow determination by the energy balance method

    Directory of Open Access Journals (Sweden)

    Davi Boehringer

    2013-04-01

    Full Text Available Medições do fluxo de seiva são importantes não somente no campo da agrometeorologia, mas também em estudos de natureza fisiológica para identificação de doenças vasculares e pesquisas destinadas à quantificação do movimento de água no sistema solo-planta-atmosfera. Este trabalho foi realizado com o objetivo de avaliar o desempenho do método do balanço de energia, a partir da inserção de um minirresistor no centro do colmo de plantas de cana-de-açúcar, visando à determinação do fluxo de seiva sob condições ambientais distintas, utilizando-se de medições gravimétricas como padrão comparativo. O experimento foi conduzido em uma casa de vegetação não climatizada, localizada na área experimental da Universidade Federal de Viçosa, Viçosa - MG. Com base no erro médio de estimativa (MBE, verificou-se que o método do balanço de energia apresentou desempenho satisfatório para a determinação da transpiração da cana-de-açúcar, tanto em condições de céu nublado como parcialmente nublado, tendo subestimado os valores gravimétricos em apenas 3,0 e 6,5 g planta-1 h-1, respectivamente. Em termos percentuais, esses valores correspondem a 4 e 5% da transpiração máxima da cana-de-açúcar.Sap flow measurements are important not only in the agrometeorology field, but also in studies of physiological nature to identify vascular diseases and researches concerned with quantification of water movement in soil-plant-atmosphere system. This study was carried out to evaluate the performance of the energy balance method, implemented by insertion of a miniresistor in the stem center of sugarcane plants, in order to determine the sap flow under distinct environment conditions, utilizing gravimetric measurements as comparative standard. The experiment was conducted in a non-environment controlled greenhouse, located at the Federal University of Viçosa, Viçosa-MG. Based on the mean bias error (MBE, it was verified that the

  9. Necessidades hídricas de citros e macieiras a partir da área foliar e da energia solar Water requirements of citrus and apple trees as affected by leaf area and solar energy

    Directory of Open Access Journals (Sweden)

    André Belmont Pereira

    2009-09-01

    Full Text Available A energia solar é a fonte primária para a fotossíntese e a transpiração vegetal para que uma cultura expresse seu potencial produtivo em um dado local. O método proposto neste estudo pretende facilitar o cálculo do volume de água (litros/planta/dia necessário para uma irrigação localizada com o mínimo desperdício possível em pomares cítricos e de macieiras, utilizando-se de dados usualmente disponíveis, tais como área foliar, densidade de fluxo de radiação solar global, saldo de radiação e déficit de saturação de vapor médio diário do ar. Considerando-se que a irrigação localizada consome bem menos água do que o sistema de aspersão, e que a outorga de água para irrigação está cada vez mais limitada, tal estudo vem a ser certamente de grande importância para assegurar a autossustentabilidade da agricultura irrigada, especialmente em regiões áridas e semiáridas. Foram utilizados neste trabalho, para desenvolvimento da metodologia proposta, dados de fluxo de seiva medidos através do método de fluxo de calor, em pomar de lima-ácida-Tahiti com área foliar de 48 e 99 m², bem como em pomar de macieiras com área foliar aproximada de 5; 8; 9; 11; 16 e 21 m². Os resultados obtidos indicaram que a metodologia proposta, baseada na habilidade das plantas em converter energia solar fixada em água transpirada, mostrou-se viável para avaliar a lâmina de irrigação de plantas cítricas e macieiras nas localidades estudadas.Solar energy is the primary source for photosynthesis and transpiration in such a way as to assure the expression of the crop yield potential at a given site. The current methodology aims to ease the calculation of the water amount (liters/plant/day necessary for a localized irrigation scheduling with a minimal loss possible at both citrus and apple trees orchards by means of usual available data, such as leaf area, global solar radiation flux density, net radiation and air daily mean steam

  10. Avaliação de modelos para predição da energia metabolizável do milho para aves Evaluation of models to predict metabolizable energy of corn for chickens

    Directory of Open Access Journals (Sweden)

    Vladimir de Oliveira

    2009-08-01

    Full Text Available O estudo foi realizado com o objetivo de avaliar modelos de predição do valor de energia metabolizável aparente corrigida (EMAn do milho para aves. Foi organizado um banco de dados contendo informações de experimentos, publicados na literatura nacional entre os anos de 1994 a 2007. Foram utilizados dados de composição química, valores de energia bruta e EMAn de 97 amostras de milho, provenientes de estudos em que os valores de EMAn foram determinados pelo método tradicional de coleta total de excretas com pintos de linhagem de corte. Avaliaram-se cinco modelos, sendo quatro deles sugeridos para estimar a EMAn do milho e um para estimar EMAn de alimentos energéticos. Os modelos estudados foram: EMAnC1 = 36,21*PB + 85,37*EE + 37,26*ENN; EMAnC2 = 37,50*PB + 85,37*EE + 38,21*ENN; EMAnC3 = 4021,8 - 227,5*MM; EMAnC4 = 4337,27 - 57,17*FDN; e EMAnC5 = 4371,18 - 26,48*PB + 30,65*EE - 126,93*MM - 52,26*FB - 25,14*FDN + 24,40*FDA. Os valores de EMAn estimados pelos modelos foram comparados com os valores observados utilizando-se a análise de regressão. Em todos os modelos avaliados, houve rejeição (PA study was realized to validate models to predict apparent metabolizable energy (AMEn of corn used in chickens diets. Data set with informations of experiments published in national literature among 1994 to 2007 was organized. Chemical composition, gross energy and AMEn of 97 corn samples were including in data set. Studies which AMEn was determined by the traditional method of excreta collection with growing chickens were selected. Five models were evaluates, being four recommended for application in corn and one for application in energetic feedstuffs. The models studied were AMEnC1=36.21*CP + 85.37*EE + 37.26*NNE; AMEnC2 =37.5*CP + 85.37*EE + 38.21*NNE; AMEnC3 =4021.8 - 227.5*ASH; AMEnC4 =4337.27 - 57.17*NDF; e AMEnC5 =4371.18 - 26.48*CP + 30.65*EE - 126.93*ASH - 52.26*CF - 25.14*NDF + 24.40*ADF. The values of AMEn obtained for the models were

  11. Polymer gel dosimetry system for radiation therapy

    International Nuclear Information System (INIS)

    Maryanski, M.J.; Schulz, R.J.; Gignac, C.; Eastman, P.; Gore, J.C.

    1995-01-01

    Purpose/Objective: Recently developed treatment modalities such as stereotactic and conformal radiation therapy produce complex dose distributions which are difficult or impractical to measure with conventional dosimetry instrumentation. Three-dimensional treatment planning systems which purport to calculate these complex dose distributions should be compared to experimental results before being routinely applied to clinical problems. There is a need for a new class of tissue-equivalent dosimeters capable of providing accurate, high resolution, time-integrated and three dimensional dose distributions. The recently developed BANG polymer gel dosimetry system (MGS Research, Inc., Guilford, CT) is ideally suited for the task described above. Physico-chemical principles of the polymer gel dosimetry are presented, together with examples of its application to radiation therapy. Data analysis and display program, written for Macintosh computer, is demonstrated. Materials and Methods: Radiation-induced polymerization of acrylic monomers, which are dispersed in tissue-equivalent gelatin, has been shown to be dependent on the dose, but independent of the dose rate or photon energy. Therefore, the spatial distribution of polymer in the gel is precisely representative of the dose distribution. As the polymeric microparticles reduce the water proton NMR relaxation times in the gel, the dose distribution can be measured with high resolution and accuracy using magnetic resonance imaging. Also, as these microparticles cannot diffuse through the gelatin matrix, their distribution is permanent. An improved formulation of the BANG dosimeter consists of 3% w/v acrylic acid, 3% N,N'-methylene-bis-acrylamide, 1% sodium hydroxide, 5% gelatin, and 88% water. MR images are transferred via a local network to a Macintosh computer, and R2 maps constructed on the basis of multiple TE images, using a non-linear least squares fit based on the Levenberg-Marquardt algorithm. A dose-to-R2

  12. Prenatal Virilization Associated with Paternal Testosterone Gel Therapy

    OpenAIRE

    Patel, Anisha; Rivkees, Scott A.

    2010-01-01

    Transdermal testosterone gels are used in the treatment of hypoandrogenism of males. Virilization due to exposure to testosterone gels has been reported in children resulting in a US Food and Drug Administration (FDA) warning about secondary exposure to these products. At present, we are unaware of prenatal virilization associated with unintentional testosterone gel exposure. We report prenatal virilization in a female infant due to secondary maternal exposure to the father's testosterone gel...

  13. Development and dosimetric evaluation of radiochromic PCDA vesicle gel dosimeters

    International Nuclear Information System (INIS)

    Sun, P.; Fu, Y.C.; Hu, J.; Hao, N.; Huang, W.; Jiang, B.

    2016-01-01

    The gel dosimeter has the unique capacity in recording radiation dose distribution in three dimensions (3D), which has the specific advantages in dosimetry measurements where steep dose gradients exist, such as in intensity-modulated radiation therapy (IMRT), brachytherapy and so on. Some 3D dosimeters, such as Fricke gel dosimeters, polymer gel dosimeters, the PRESAGE plastic dosimeters and micelle gel dosimeters have appeared recently. However, there are several disadvantages of these 3D dosimeters limit their application in radiotherapy dose verification. In this study, a novel radiochromic gel dosimeter for 3D dose verification of radiotherapy was developed by dispersing nanovesicles self-assembled by 10,12-pentacosadiynoic acid (PCDA) into the tissue equivalence gel matrix. The characteristics of radiochromic PCDA vesicle gel dosimeters were evaluated. The results indicate that these radiochromic gel dosimeters have good linear dose response to X-ray irradiation in the dose range of 2–100 Gy. In addition, the radiochromic gel dosimeters breakthrough the limitations of the existing gel dosimeters such as diffusion effect, post-radiation effect, and poor forming ability. The response of the gel dosimeter does not show any dose rate dependence, energy dependence and temperature effect, and there was no obvious difference in the gel response between single and cumulative dose of fractional irradiation. Hence, the radiochromic PCDA vesicle gel dosimeters developed in this study could be generally applied to 3D dose verification in radiotherapy. - Highlights: • A novel radiochromic gel dosimeter was developed by dispersing PCDA nanovesicles into the tissue equivalence gel matrix. • This nanovesicle overcomes the dose image blurring caused by the diffusion of monomer molecules. • This nanovesicle limits the polymer chain growth, so as to reduce the post-radiation effect. • The gel matrixes possess excellent tissue equivalence and elastic strength, which

  14. Estudos de sistemas microemulsionados utilizando água produzida na recuperação avançada de petróleo

    OpenAIRE

    Deus, Marcell Santana de

    2015-01-01

    Os reservatórios de petróleo possuem, na época da sua descoberta, uma energia inicial, chamada de energia primária. Quando a energia natural do reservatório não é mais suficiente para fazer com que o óleo escoe para os poços, ainda há um grande volume de óleo retido no mesmo, portanto, para que esse volume chegue à superfície, é necessária a aplicação de métodos visando aumentar a produtividade do campo. Esses métodos são denominados de Métodos de Recuperação. Existem duas classes de métodos ...

  15. Detección de fraude bancario en tiempo real utilizando tecnologías de procesamiento distribuido

    OpenAIRE

    Mansilla Montero, Javier

    2016-01-01

    En este Trabajo de Fin de Máster se desarrollará un sistema de detección de fraude en pagos con tarjeta de crédito en tiempo real utilizando tecnologías de procesamiento distribuido. Concretamente se considerarán dos tecnologías: TIBCO, un conjunto de herramientas comerciales diseñadas para el procesamiento de eventos complejos, y Apache Spark, un sistema abierto para el procesamiento de datos en tiempo real. Además de implementar el sistema utilizando las dos tecnologías propuestas, un objet...

  16. Viscoelastic nature of Au nanoparticle–PDMS nanocomposite gels

    Indian Academy of Sciences (India)

    Even a very low Au content of 0.09 wt% is sufficient enough to bring in the transition from sponge state to gel state at room temperature. ... gel properties can have direct influence on the processability of Au nanoparticle–PDMS nanocomposite gels, with interesting implications in electronic, optical and microfluidic devices.

  17. Formulation and method for preparing gels comprising hydrous hafnium oxide

    Science.gov (United States)

    Collins, Jack L; Hunt, Rodney D; Montgomery, Frederick C

    2013-08-06

    Formulations useful for preparing hydrous hafnium oxide gels contain a metal salt including hafnium, an acid, an organic base, and a complexing agent. Methods for preparing gels containing hydrous hafnium oxide include heating a formulation to a temperature sufficient to induce gel formation, where the formulation contains a metal salt including hafnium, an acid, an organic base, and a complexing agent.

  18. Power Law Behavior of Structural Properties of Protein Gels

    NARCIS (Netherlands)

    Verheul, Marleen; Roefs, Sebastianus P.F.M.; Mellema, J.; Kruif, Kees G.

    1998-01-01

    Whey proteins are globular, heat-sensitive proteins. The gel structure, the formation of this structure, and the rheological properties of particulate whey protein isolate (WPI) gels have been investigated. On increasing the NaCl concentration, the permeability of the WPI gels increased, indicating

  19. Outdoor weathering of sol-gel-treated wood

    Science.gov (United States)

    Mandla A Tshabalala; Ryan Libert; Nancy Ross Sutherland

    2009-01-01

    Outdoor weathering of wood specimens treated with sol-gel formulations based on methyltrimethoxysilane (MTMOS), hexadecyltrimethoxysilane (HDTMOS), and ferric-zirconia-titania (Fe-Zr-Ti) sol was evaluated. The sol-gel process allowed deposition of a thin film of hybrid inorganic-organic networks (gel) in the wood cell wall that resulted in improved outdoor weathering...

  20. Agarose Gel Size Selection for DNA Sequencing Libraries.

    Science.gov (United States)

    Mardis, Elaine; McCombie, W Richard

    2017-08-01

    Agarose gel electrophoresis may be used to purify fragmented genomic DNA after ligation of adaptors. After electrophoresis, the region of the gel containing the desired size range of DNA is excised, and the DNA is subsequently extracted from the gel and purified by passage through a spin column. © 2017 Cold Spring Harbor Laboratory Press.

  1. Formulation and method for preparing gels comprising hydrous aluminum oxide

    Science.gov (United States)

    Collins, Jack L.

    2014-06-17

    Formulations useful for preparing hydrous aluminum oxide gels contain a metal salt including aluminum, an organic base, and a complexing agent. Methods for preparing gels containing hydrous aluminum oxide include heating a formulation to a temperature sufficient to induce gel formation, where the formulation contains a metal salt including aluminum, an organic base, and a complexing agent.

  2. Antiplaque and antigingivitis effects of a gel containing Punica granatum Linn extract: a double-blind clinical study in humans Efeito antiplaca e antiinflamatório de um gel contendo extrato de romã: estudo clínico duplo-cego em humanos

    Directory of Open Access Journals (Sweden)

    Alexandre Daher Yunes Salgado

    2006-06-01

    Full Text Available OBJECTIVES: The antiplaque and antigingivitis effects of a gel containing 10% Punica granatum Linn extract were evaluated using a 21-day partial-mouth experimental model of gingivitis. METHODS: 23 volunteers participated in this cross-over, double-blind study, carried out in 2 phases of 21 days each. For each period of the experiment, an acrylic toothshield was made for each volunteer to carry the test or placebo gel as well as to avoid brushing of the 4 experimental teeth (posterior teeth in the lower left quadrant. The subjects were randomly assigned to use either the placebo gel (control group or the test gel (experimental group and were instructed to brush the remaining teeth normally 3 times a day. On days 0 and 21, the visible plaque index (VPI and gingival bleeding index (GBI were recorded. RESULTS: The results did not show statistically significant difference between control and experimental groups for either of the indices (VPI and GBI. CONCLUSION: The gel containing 10% Punica granatum Linn extract was not efficient in preventing supragingival dental plaque formation and gingivitis.OBJETIVOS: O efeito antiplaca e antigengivite de um gel contendo extrato de romã a 10% foi avaliado utilizando um modelo de gengivite experimental parcial em humanos. MÉTODOS: 23 indivíduos participaram voluntariamente deste estudo cruzado, duplo-cego, compreendendo dois períodos de 21 dias cada um. Uma moldeira de acrílico foi confeccionada para cada participante, a qual foi utilizada como carreadora dos géis sobre a área a ser avaliada (hemiarco inferior esquerdo. Os sujeitos foram aleatoriamente designados para usar o gel placebo (grupo controle ou o gel teste (grupo experimental, sendo instruídos a colocar o gel na moldeira e esta sobre os dentes teste, escovando os outros normalmente três vezes ao dia. No dia 0 e dia 21 os índices de placa visível (IPV e índice de sangramento gengival (ISG foram registrados. RESULTADOS: Os resultados n

  3. O efeito do laser de baixa energia no crescimento bacteriano "in vitro" Low level laser effect in "in vitro" bacterial growth

    Directory of Open Access Journals (Sweden)

    Fernando Coutinho

    2007-08-01

    Full Text Available OBJETIVO: Avaliar, por meio de estudo bacteriológico in vitro, o efeito de dois tipos de laser de baixa energia (LBE sobre diferentes populações bacterianas habitualmente presentes em feridas pós-traumáticas. MÉTODOS: Foram colhidos swabs diretamente do sítio de infecção de pacientes internados com osteomielite pós-traumática crônica. As bactérias isoladas foram Acinetobacter baumanii complex, Escherichia coli, Haemophilus influenzae, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonela sp, Serratia sp e Staphylococcus aureus. O material coletado foi semeado em meio ágar-sangue, através de alça estéril, utilizando-se 30 placas de Petri para cada germe. Foram utilizados dois aparelhos de LBE: Ibramed Laser Pulse #01189, com 15W/904nm por 200 segundos, e Phisiolux dual Bioset #9909001, com 20W/904nm por 230 segundos. Nos grupos I (n = 10 e II (n = 10, as bactérias sofreram irradiação pelo laser. O grupo III (n = 10 serviu de controle, não sendo irradiado. As bactérias dos grupos I e II foram irradiadas em câmara de fluxo laminar, previamente esterilizada por raio ultravioleta. O laser foi administrado de forma direta, central e perpendicularmente à superfície de cultivo das bactérias, com distância-padrão de 1cm, através de orifício confeccionado na tampa das placas. O crescimento bacteriano foi analisado após 12 e 24 horas da irradiação. Os resultados foram processados estatisticamente, utilizando-se o teste não-paramétrico de Kruskall-Wallis, com nível de significância p OBJECTIVE: To perform an in vitro bacteriologic study to evaluate the effect of two types of low level laser (LLL on different bacterial populations usually present in post-traumatic wounds. METHODS: Swabs were prepared directly at the infection site of patients hospitalized with chronic post-traumatic osteomyelitis. Isolated bacteria were Acinetobacter baumanii complex, Escherichia coli, Haemophilus influenzae, Klebsiella pneumoniae

  4. Description of the international scenarios and the renewable energies (Chapter 4 in 'A vision of year 2030 on the use of the renewable energies in Mexico'); Descripcion de los escenarios internacionales y las energias renovables (Capitulo 4 en 'Una vision al 2030 de la utilizacion de las energias renovables en Mexico')

    Energy Technology Data Exchange (ETDEWEB)

    Mulas del Pozo, Pablo [Universidad Autonoma Metropolitana, Mexico, D.F. (Mexico)

    2005-08-15

    In this chapter, energy scenarios made by different organizations are described, the majority foreign, and they do not represent an official version of the Secretaria de Energia of the Mexican government. 1. The IEO-2004, Projections to year 2025 of the Energy Information Agency (EIA) of the Department of Energy of the USA (DOE, USA). - it describes the world-wide energy situation with historical information (1970-2000) and projections to the future (2001-2025); 2. The WOE-2004, Projections to year 2030 of the Agency International of Energy of the Organization for Economic Cooperation and Development (AIE-OECD) - it describes the world-wide energy situation with historical information (1971-2002) and projections to the future (2002-2030); 3. The scenarios of Shell to year 2050; 4, Scenarios to year 2025 of the Agency International of Energy oriented to a sustainable future: it is a document published in the 2003, it contains the results of an exercise to develop three exploratory scenarios and a formative scenario/projections; 5. The study of the World-wide Council of Energy on the activators of the energy sector; 6. Other scenarios for Mexico are: Asian-Pacific Economic Cooperation, GEO-Mexico and the Centro de Investigacion de Energia de la Universidad Nacional Autonoma de Mexico. [Spanish] En este capitulo, se describen escenarios energeticos a largo plazo realizados por diferentes entidades, la mayoria extranjeras, y no representan una version oficial de la Secretaria de Energia del gobierno de Mexico. 1. El IEO-2004, Proyecciones al 2025 de la Energy Information Agency (EIA) del departamento de energia de los EUA (DOE, USA).- describe la situacion energetica mundial con informacion historica (1970-2000) y proyecciones a futuro (2001-2025); 2. El WOE-2004, Proyecciones al 2030 de la Agencia Internacional de Energia de la Organizacion para la Cooperacion y el Desarrollo Economico (AIE-OCDE).- describe la situacion energetica mundial con informacion historica

  5. Vaginoplastia: modificación de la técnica de McIndoe usando esponja de gel hemostático Vaginoplasty: modification to McIndoe techique using hemostatic gel sponge

    Directory of Open Access Journals (Sweden)

    N. Antoniadis

    2011-03-01

    Full Text Available Presentamos el caso de una paciente de 23 años de edad, que consulta por amenorrea primaria. En el examen físico encontramos: fenotipo femenino, genitales externos normales y genitales internos con ausencia de vagina. Los exámenes complementarios, ultrasonido y tomografía abdomino-pélvica, demostraron útero aplásico. El perfil hormonal (FSH, LH, estradiol, progesterona, testosterona y prolactina fue normal y el cariotipo, 46 XX. Se diagnosticó clínicamente como Síndrome de Mayer-Rokitansky-Küster-Hauser. Realizamos vaginoplastia utilizando técnica descrita por McIndoe modificada, empleando esponja de gel hemostático para la fijación de los injertos.We report a case of a 23 years old female patient with primary amenorrhea. Physical exam: phenotipically female, normal external genitalia, show internal genitalia without evidence of vagina. Complimentary exams, abdominopelvic ultrasound and tomography: aplasic uterus. FSH, LH, estradiol, progesterone, testosterone, prolactin, all normal. Cariotype: 46XX. She is clinically diagnosed as a Mayer-Rokitansky-Küster-Hauser syndrome. Vaginoplasty was performed by modifications of McIndoe´s technique, using hemostatic gel sponges for grafts integration.

  6. Competitive policies in the Nordic energy research and innovation area - eNERGIA : Part 1: Country reports

    Energy Technology Data Exchange (ETDEWEB)

    Klitkou, Antje; Pedersen, Trond Einar; Scordato, Lisa; Mariussen, Aage

    2008-07-01

    This (Part 1: Country reports) is the first report about the results from the eNERGIA project. The second report mainly deals with selected renewable energy technologies from different perspectives, while the third report sums up the SWOT-analysis, the eNERGIA workshops and the case studies of good practice. A short synthesis report summarises the entire project. This first report is the presentation of the countries studied in the project - Denmark, Finland, Iceland, Norway, Sweden, Estonia, Latvia and Lithuania. The policy system and the political framework conditions that underpin energy related industrial activity are reviewed for each country. This includes energy strategies, laws and regulations, R&D and innovation policies and instruments, and international collaboration. Key actors and institutions in the public domain, research and education, and non-governmental organisations are mapped. Finally, the descriptions of the countries include also technology specific overviews of R&D-intensive firms in the energy sector. The report comprises three parts: Part 1: Country reports Part 2: Technology reports Part 3: Special reports The results are summarised in the Synthesis report. (Author). refs., 24 figs., 49 tabs

  7. Energy saving by the use of polystyrene in construction; Ahorro de energia por la utilizacion de poliestireno en la construccion

    Energy Technology Data Exchange (ETDEWEB)

    Pimentel, Raul [Polioles S. A. de C. V., Mexico, D. F. (Mexico)

    1992-12-31

    In the past last years, the building industry has been faced with requirements in the rational energy use and environmental preservation. The polystyrene foam is a material that for more than forty years has demonstrated its attributes all over the world in its application in the construction industry as well as in the packing and crating industries, becoming a synonym of economic construction in regard to energy saving and a synonym also of a rational and safe packing. In this paper a short description is made of the manufacturing process of the expandable polystyrene foam, its properties and applications in the construction industry. [Espanol] En los ultimos anos, la industria de la construccion se ha enfrentado a exigencias en el uso racional de la energia y en la preservacion del medio ambiente. La espuma de poliestireno expansible es un material que por mas de cuarenta anos, ha demostrado sus cualidades a nivel mundial en su aplicacion tanto en la industria de la construccion como en la del empaque y embalaje, llegando a convertirse en sinonimo de una construccion economica en cuanto a ahorro de energia y sinonimo tambien de un embalaje racional y seguro. En este trabajo se hace una breve descripcion del proceso de fabricacion de la espuma de poliestireno expandible, sus propiedades y aplicaciones dentro de la industria de la construccion.

  8. Balanço de energia e consumo hídrico de vinhedo de ‘Cabernet Franc’

    Directory of Open Access Journals (Sweden)

    Mário José Pedro Júnior

    2015-06-01

    Full Text Available O método do balanço de energia foi utilizado em vinhedo da uva para vinho ‘Cabernet Franc’, conduzido em espaldeira alta, para caracterizar a repartição do saldo de radiação (SR nos diferentes fluxos de calor: latente (LE, sensível e no solo. Em média LE representou aproximadamente 79% de SR. São apresentadas as variações horárias dos componentes do balanço de energia para dias: ensolarado e nublado. O consumo hídrico do vinhedo para os diferentes subperíodos fenológicos foi: poda-florescimento (99 mm, florescimento-início de maturação (249 mm e início de maturação-colheita (201 mm. Para o ciclo total (poda-colheita, o consumo hídrico obtido foi de 549 mm.

  9. Potential of bioclimatic architecture for energy saving in buildings; Potencial de la arquitectura bioclimatica para ahorro de energia en edificios

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Chavez, Jose Roberto [Universidad Autonoma Metropolitana-Azcapotzalco, Mexico, D. F. (Mexico)

    1994-12-31

    The design and construction of current buildings has been characterized, most of all, in the last 30 years, for the lack of consideration in the design process of aspects that nowadays represent a fundamental importance. These aspects are related to energy conservation and environmental protection, with man as the main center of attention for the optimum satisfaction of its physiological as well as psychological needs. In this paper are presented the causes for the lack of consideration of the mentioned aspects and guidelines to follow are set forth for their integration in the design process. Also the architecture potential with a bioclimatic approach is analyzed, for energy saving in buildings. [Espanol] El diseno y construccion de edificios contemporaneos se ha caracterizado, sobre todo en los ultimos treinta anos, por la falta de consideracion en el proceso de diseno, de aspectos que hoy en dia revisten una importancia primordial. Estos aspectos se relacionan con la preservacion de la energia y del medio ambiente, teniendo al hombre como principal centro de atencion, para la satisfaccion optima de sus necesidades, tanto fisiologicas como psicologicas. En este trabajo, se presentan las causas de la falta de consideracion de los aspectos antes citados y se plantean las pautas a seguir para su integracion en el proceso de diseno. Asi mismo, se analiza el potencial de la arquitectura con un enfoque bioclimatico, para ahorro de energia en los edificios.

  10. ANÁLISE DE CRESCIMENTO DA MAMONEIRA BRS ENERGIA EM FUNÇÃO DA DENSIDADE POPULACIONAL

    Directory of Open Access Journals (Sweden)

    GIBRAN DA SILVA ALVES

    2015-01-01

    Full Text Available The population density is one of the factors that affect the final yield of crops, being easily ma-nipulated by man. The objective was to evaluate the growth of castor bean plants cv BRS Energia in dense pop-ulations through primary data and non-destructive analysis of growth and identify which period greater vegeta-tive growth occurs. We adopted a randomized block design with five treatments and four replications, totaling 20 experimental units. Each experimental unit contained 4 m wide and 6 m in length, representing 24 m². Treatments involving five populations of plants 10.000; 16.666; 25.000; 50.000; 100.000 plants ha-1, with a spacing of 1 m between rows and 1; 0.6; 0.4; 0.2 and 0.1 m between plants, respectively. It was determined: stem diameter, plant height, leaf area, leaf area index and rates absolute and relative leaf growth, of stem diam-eter, of plant height and of fresh biomass epigeal. The castor bean BRS Energia has the highest rates of vegeta-tive increase between 15 and 45 days after emergence. Therefore, it is of great importance, in this period, pro-vide the plant water and nutrient conditions appropriate so that does not compromise on plant development.

  11. Management and control of the electrical energy demand; Administracion y control de la demanda de la energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Johnson Controls [Comision Federal de Electricidad (Mexico)

    2005-07-01

    Administrative measures allow a reduction in the energy consumption, but not always in the electrical demand. Control measures allow a reduction in the billing of the electrical demand, but not always in the energy consumption. This is why it is explained in this document what management and control of the electrical demand is, as well as its control strategies, the control alternatives, the billing demand and at the same time graphical representations along with three practical cases on the management of demand in air compressors, air conditioning equipment and in corporative buildings are presented. [Spanish] La aplicacion de las medidas administrativas permite reducir el consumo de energia, pero no siempre la demanda electrica. La aplicacion de medidas de control permiten reducir la demanda electrica facturable, pero no siempre el consumo de energia. Es por eso que en este documento se explica que es la administracion y el control de la demanda electrica, sus estrategias de control, las alternativas de control, la demanda facturable, representaciones graficas y tres casos practicos sobre la administracion de demanda en compresores de aire, la administracion de demanda en aire acondicionado y la administracion de demanda en un edificio corporativo.

  12. Optical-CT scanning of polymer gels

    International Nuclear Information System (INIS)

    Oldham, M

    2004-01-01

    The application of optical-CT scanning to achieve accurate high-resolution 3D dosimetry is a subject of current interest. The purpose of this paper is to provide a brief overview of past research and achievements in optical-CT polymer gel dosimetry, and to review current issues and challenges. The origins of optical-CT imaging of light-scattering polymer gels are reviewed. Techniques to characterize and optimize optical-CT performance are presented. Particular attention is given to studies of artifacts in optical-CT imaging, an important area that has not been well studied to date. The technique of optical-CT simulation by Monte-Carlo modeling is introduced as a tool to explore such artifacts. New simulation studies are presented and compared with experimental data

  13. Gel Fabrication of Molybdenum “Beads”

    Energy Technology Data Exchange (ETDEWEB)

    Lowden, Richard Andrew [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Armstrong, Beth L. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Cooley, Kevin M. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

    2016-11-01

    Spherical molybdenum particles or “beads” of various diameters are of interest as feedstock materials for the additive manufacture of targets and assemblies used in the production of 99Mo medical isotopes using accelerator technology. Small metallic beads or ball bearings are typically fabricated from wire; however, small molybdenum spheres cannot readily be produced in this manner. Sol-gel processes are often employed to produce small dense microspheres of metal oxides across a broad diameter range that in the case of molybdenum could be reduced and sintered to produce metallic spheres. These Sol-gel type processes were examined for forming molybdenum oxide beads; however, the molybdenum trioxide was chemically incompatible with commonly used gelation materials. As an alternative, an aqueous alginate process being assessed for the fabrication of oxide spheres for catalyst applications was employed to form molybdenum trioxide beads that were successfully reduced and sintered to produce small molybdenum spheres.

  14. Local mobility and topology in gels

    International Nuclear Information System (INIS)

    Higgins, J.S.; Ma, K.; Hall, R.H.; Warner, M.

    1981-04-01

    In the first section of this two part report entitled 'Separation of the motion around cross-link points from main chain motion in network samples' by Higgins, Ma and Hall, experimental evidence for topologically dependent diffusion in gels and rubbers is presented from high resolution neutron scattering experiments on deuterium labelled model trifunctional networks which show that the junction points move more slowly than the free chain centres by a factor of about two. In the second part by Warner entitled 'The dynamics of particular points on a polymer chain', the diffusional dynamics of particular points of a polymer chain is calculated in the Rouse approximation. The points considered correspond, in the case of incoherent neutron scattering, to the proton-labelled free ends of chains, crosslinks between chains in rubbers or gels, or the central monomers in branched or star polymers. Results derived are also relevant to NMR, ESR and computer simulation experiments. (U.K.)

  15. Solvent induced supramolecular anisotropy in molecular gels

    Energy Technology Data Exchange (ETDEWEB)

    Rogers, Michael A., E-mail: mroger09@uoguelph.ca [Department of Food Science, University of Guelph, Guelph, Ontario, N3C3X9 (Canada); Corradini, Maria G. [Department of Food Science, University of Massachusetts Amherst, Amherst, MA, 01003 (United States); Emge, Thomas [Department of Chemistry and Biochemistry, Rutgers University, New Brunswick, NJ, 08901 (United States)

    2017-06-15

    Herein is the first report of solvent induced anisotropy in 12-hydroxystearic acid self-assembled fibrillar networks. Increasing the chain length of polar solvent, such as nitriles and ketones, tailored the anisotropy of the fibrillar aggregates. 12HSA molecular gels, comprised of alkanes, exhibited an isotropic fibrillar network irrespective of the alkane chain length. In polar solvents, anisotropy, observed using 2D powder x-ray diffraction profiles, is correlated to a fibrillar supramolecular morphologies in long chain nitriles and ketones while sphereulitic crystals are correlated to x-ray diffraction patterns with an isotropic scatter intensity in short chain ketones and nitriles. These changes directly modify the final physical properties of the gels. - Highlights: • 12-HSA self-assembles into crystalline supramolecular morphologies depending on the solvent. • Alkanes, short chain nitriles and ketones led to 12-HSA displaying supramolecular isotropy. • In long chain nitriles and ketones, 12-HSA displays supramolecular anisotropy.

  16. Solvent induced supramolecular anisotropy in molecular gels

    International Nuclear Information System (INIS)

    Rogers, Michael A.; Corradini, Maria G.; Emge, Thomas

    2017-01-01

    Herein is the first report of solvent induced anisotropy in 12-hydroxystearic acid self-assembled fibrillar networks. Increasing the chain length of polar solvent, such as nitriles and ketones, tailored the anisotropy of the fibrillar aggregates. 12HSA molecular gels, comprised of alkanes, exhibited an isotropic fibrillar network irrespective of the alkane chain length. In polar solvents, anisotropy, observed using 2D powder x-ray diffraction profiles, is correlated to a fibrillar supramolecular morphologies in long chain nitriles and ketones while sphereulitic crystals are correlated to x-ray diffraction patterns with an isotropic scatter intensity in short chain ketones and nitriles. These changes directly modify the final physical properties of the gels. - Highlights: • 12-HSA self-assembles into crystalline supramolecular morphologies depending on the solvent. • Alkanes, short chain nitriles and ketones led to 12-HSA displaying supramolecular isotropy. • In long chain nitriles and ketones, 12-HSA displays supramolecular anisotropy.

  17. Modelo matricial para la asignación del costo utilizando activity basing cost

    Directory of Open Access Journals (Sweden)

    Julio César Millán-Solarte

    2014-01-01

    Full Text Available Esta investigación presenta la propuesta para asignación de los costos, utilizando la metodología ABC, bajo el modelo matricial. Esto implica la construcción de matrices, entendidas estas como un arreglo ordenado de m filas por n columnas. El costo total para la realización de una actividad se basará en el número de veces que dicha actividad se realice durante un período específico. A partir de lo anterior, se puede obtener el costo total de la fabricación del producto (o la prestación de un servicio si se suman las actividades necesarias para su elaboración.

  18. Reconhecimento de padrões de falhas em motores trifásicos utilizando redes neurais

    OpenAIRE

    Reis, Aderson Jamier Santos

    2010-01-01

    Este trabalho apresenta um sistema de diagnóstico de falhas (rotor, estator e contaminação) do motor de indução trifásico através dos parâmetros do circuito equivalente e utilizando técnicas de reconhecimento de padrões. A tecnologia de detecção de falhas em motores está evoluindo e tornando cada vez mais importante na área de máquinas elétricas. As redes neurais possuem a habilidade de classificar relações não lineares entre sinais através da identificação de padrões dos sinai...

  19. Projeto de acopladores ópticos utilizando algoritmo genético

    OpenAIRE

    Jaqueline Oliveira Zampronio

    2016-01-01

    Resumo: Este projeto é uma proposta de um novo acoplador óptico para a aplicação em circuitos ópticos integrados. O dispositivo foi desenvolvido utilizando o método dos elementos finitos vetorial 3D associado com o algoritmo genético e leva em consideração guias de onda com diferentes altura, largura e índices de refração. O comprimento total do acoplador óptico é de apenas 4,22 µm e o seu funcionamento é baseado em pequenos segmentos cilíndricos que interferem na propagação da onda eletromag...

  20. GLUE: um modelo de Clusterização utilizando mobilidade.

    OpenAIRE

    Silva, Fernando Augusto Medeiros

    2013-01-01

    Programa de Pós-Graduação em Ciência da Computação. Departamento de Ciência da Computação, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto. O uso de clusters em MANETs é comum em situações de roteamento e entrega de conteúdo. O aumento do uso de smartphones com suporte a comunicação ponto a ponto, em especial o WiFi Direct, justifica o uso de algoritmos de clusterização adaptados a esses dispositivos e seus casos de uso. Em um cenário de turistas utilizando sm...