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Sample records for catalisador na oxidacao

  1. Avaliação do desempenho de catalisadores híbridos Ziegler-Natta/metaloceno na homo- e copolimerização de etileno

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    Cunha Fernanda O. V.

    2000-01-01

    Full Text Available Foram preparados catalisadores híbridos a partir de um catalisador do tipo Ziegler-Natta heterogêneo (MgCl2.TiCl4 e de um metalocênico (CpTiCl3, afim de se obter catalisadores com diferentes tipos de centros ativos. Foi proposta a formação de um novo centro ativo (CpTi(iBuCl2 na face 100 do suporte de MgCl2. Estes catalisadores foram avaliados na síntese de polietileno de alta densidade (PEAD e de polietileno linear de baixa densidade (PELBD, utilizando-se somente trietilalumínio (TEA como cocatalisador. Foi verificada a influência da razão molar Al/Ti, temperatura e tempo de polimerização na produtividade dos catalisadores e nas propriedades dos polímeros obtidos. Os catalisadores mistos apresentaram atividade catalítica da ordem de 5,0 kgPol/g cat.h na polimerização de etileno e da ordem de 7,0 kgPol/g cat.h na copolimerização etileno-1-buteno.

  2. Catalisadores sol-gel de Ni-SiO2 e Ni-Al2O3 aplicados na reforma de metano com CO2 - DOI: 10.4025/actascitechnol.v27i1.1492

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    Giane Gonçalves

    2005-03-01

    Full Text Available A reação de reforma do metano com CO2 apresenta-se como um processo promissor de geração de gás de síntese e hidrogênio. Neste sentido, foram preparados catalisadores de níquel-sílica e níquel-alumina pelo método sol-gel, com carga metálica nominal de 8% em massa. Os catalisadores foram caracterizados por redução à temperatura programada, análise termogravimétrica e determinação da área superficial específica. A reação de reforma do metano com CO2 foi realizada em um micro-reator contendo 500 mg de catalisador, previamente ativado em uma mistura redutora contendo hidrogênio. Os ensaios de reforma a seco do metano foram realizados a 800C, na pressão atmosférica, por um período de 12 horas, com uma razão molar de alimentação de [CO2:CH4] = 6. Os produtos da reação foram analisados por cromatografia gasosa. Dentre os catalisadores avaliados, nas condições de reação estudadas, o catalisador de níquel suportado em sílica foi o que apresentou o melhor desempenho

  3. Estudo de catalisadores a base de cobre e nióbia na reação de reforma a vapor de etanol - DOI: 10.4025/actascitechnol.v29i1.78

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    Roberta Carolina Pelissari Rizzo-Domingues

    2007-12-01

    Full Text Available Catalisadores Cu/Nb2O5 foram modificados pela incorporação de MgO ou K2O (redutores da acidez do suporte ou Ni (um facilitador da quebra da ligação C-C para serem utilizados na reforma do etanol em unidade de bancada com leito catalítico de 7 g a 573 K, variando-se a velocidade espacial e a razão molar dos reagentes de modo a otimizar o processo de produção de hidrogênio com conseqüente diminuição de subprodutos. Os catalisadores foram caracterizados por área superficial específica, difração de raios-X e redução à temperatura programada. Pôde-se verificar que a introdução de óxido dopante da acidez ou de um segundo metal provocou um aumento da porosidade e da temperatura de início de redução do cobre nos catalisadores, alterando dessa forma a superfície catalítica. A redução da acidez do suporte diminuiu a formação de subprodutos e aumentou a de hidrogênio. Níquel como segundo metal aumentou a produção de CO e CH4.

  4. Optimização de catalisadores básicos provenientes de casca de ovo activos na produção de biodiesel

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    Meireles, Sara Vigia

    2014-01-01

    Uma das dificuldades no que concerne à utilização e produção do biodiesel e que ainda persiste, diz respeito ao recurso a bases fortes como catalisadores num processo homogéneo. Para além destes serem nocivos para o ambiente, possuem o inconveniente de produzirem sabões, os quais dificultam a separação do biodiesel formado. Assim sendo, neste trabalho foi estudada a transesterificação de triglicéridos com metanol, recorrendo a um processo catalítico heterogéneo. Os catalisadores que foram ...

  5. Influência da temperatura e da natureza do catalisador na polimerização do glicerol Influence of temperature and nature of the catalyst on glycerol polymerization

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    Miguel de A. Medeiros

    2010-09-01

    Full Text Available Neste trabalho, a polimerização do glicerol na presença de catalisador ácido (H2SO4 ou H3PO4 e básico (NaOH, para produzir resinas termofixas foi investigada. Os resultados mostraram que as variáveis como a temperatura de reação, o tipo e a concentração do catalisador são críticas para a obtenção de bons rendimentos e seletividade para materiais poliméricos. Em condições otimizadas, i.e. H2SO4 como catalisador, 140 °C por 24 horas, foi possível obter polímeros com 98% de seletividade. Após polimerização, os materiais obtidos foram submetidos a extrações com diferentes solventes, i.e. água, THF e hexano. Os extratos foram caracterizados por ESI(+-MS e por espectroscopia na região do infravermelho, que permitiram verificar a presença de oligômeros de até seis unidades monoméricas. Para menores tempos de reação, e.g. 4 horas, foi possível obter elevada seletividade (100% para oligômeros, mas com baixa conversão de glicerol (25%. Além disso, verificou-se que os outros catalisadores (H3PO4 e NaOH apresentam baixa atividade para promover a polimerização do glicerol, e.g. rendimento de 25% após 24 horas.In this work, an investigation was made of the glycerol polymerization in the presence of acid (H2SO4 or H3PO4 and base (NaOH catalysts to produce thermosetting resins. The results showed that the reaction temperature and catalyst concentration are critical to obtain good yield and selectivity. Under optimum condition, i.e. H2SO4 catalyst, 140 °C for 24 hours it was possible to obtain polymers with 98% selectivity. After the polymerization the materials were submitted to extractions with different solvents, i.e. water, THF and hexane. The extracts were characterized by ESI(+-MS (Electro-Spray Ionization Mass Spectrometry and by FTIR, showing the presence of short-chain oligomers (up to six units. For shorter reaction times, e.g. 4 hours, it was possible to obtain high selectivity (100% for oligomers, but with low

  6. Estudo de catalisadores a base de cobre e nióbia na reação de reforma a vapor de etanol = Study of catalysts based on copper and niobium oxide in steam reforming of ethanol

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    Roberta Carolina Pelissari Rizzo-Domingues

    2007-01-01

    Full Text Available Catalisadores Cu/Nb2O5 foram modificados pela incorporação de MgO ouK2O (redutores da acidez do suporte ou Ni (um facilitador da quebra da ligação C-C para serem utilizados na reforma do etanol em unidade de bancada com leito catalítico de 7 g a 573 K, variando-se a velocidade espacial e a razão molar dos reagentes de modo a otimizar oprocesso de produção de hidrogênio com conseqüente diminuição de subprodutos. Os catalisadores foram caracterizados por área superficial específica, difração de raios-X e redução à temperatura programada. Pôde-se verificar que a introdução de óxido dopante daacidez ou de um segundo metal provocou um aumento da porosidade e da temperatura de início de redução do cobre nos catalisadores, alterando dessa forma a superfície catalítica. A redução da acidez do suporte diminuiu a formação de subprodutos e aumentou a dehidrogênio. Níquel como segundo metal aumentou a produção de CO e CH4.Cu/Nb2O5 catalysts were modified by the incorporation of MgOor K2O (support acidity reducer and Ni (a facilitator of the bond break C-C to be used in the ethanol reforming in bench-scale unit with catalytic bed of 7 g at 573 K, varying the space velocity and the molar rate of the reagents in order to optimize the process ofproduction of hydrogen with consequent decrease of by-products. The catalysts were characterized by specific superficial area, X-ray diffraction and temperature programmed reduction. Results showed that the introduction of the basic oxide or a second metal, nickel, lead to an increase in the porosity and in the temperature at the beginning of copper reduction in the catalyst. The acidity reduction of the support decreased the formation of by-products and increased the hydrogen formation. Nickel as a second metal increased theproduction of CO and CH4.

  7. Influência da estrutura do catalisador a base de Zirconoceno na estereorregularidade e propriedades do polipropileno formado Influence of Zirconocene structure on polypropylene stereorregularity and properties

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    Mário R. Meneghetti

    1997-03-01

    Full Text Available RESUMO: Catalisadores de metalocenos com diferentes simetrias, cocatalisados por metilaluminoxanas (MAO, foram avaliados em diferentes temperaturas de polimerização do propileno. Os metalocenos com ponte interanelar, ou seja, o dicloreto de rac-etileno bis(h5-1-indenil zircônio, com simetria C2, e o dicloreto de isopropilideno(h5-ciclopentadienil(h5-9-fluorenil zircônio, com simetria Cs, produziram, respectivamente, polipropileno isotático e sindiotático. O grau de taticidade desses polímeros diminui com o aumento da temperatura de polimerização. Os metalocenos sem ponte, dicloreto de bis(h5-ciclopentadienilzircônio e bis(h5-indenilzircônio, em qualquer uma das temperaturas investigadas, produziram, somente, polipropileno atático. A estereorregularidade dos polímeros foram determinadas por Ressonância Magnética Nuclear de 13C.ABSTRACT: Metallocenes with different symmetries in combination with methylaluminoxane (MAO, have been investigated at different propylene polymerization temperatures. The metallocenes rac-ethylene bis(h5-1-indenyl zirconium dichloride, with C2 symmetry and isopropylidene (h5cyclopentadienyl(h5-9-fluorenyl zirconium dichloride, with Cs symmetry, produce isotactic and syndiotactic polypropylene respectively. The degree of tacticity of these polymers decreases with the increase of polymerization temperature. Only atactic polypropylene was formed with the unbridged zirconocenes bis(h5-cyclopentadienyl zirconium dichloride and bis(h5-indenyl zirconium dichloride at any temperature investigated. The polymer microtacticity was analysed by 13C NMR.

  8. Efeitos estéricos e eletrônicos de substituintes alquilas em catalisadores titanocênicos solúveis na polimerização sindioespecífica de estireno

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    Pereira Brasilio C. A.

    1999-01-01

    Full Text Available Titanocenos são catalisadores solúveis conhecidos para a polimerisação estereoespecífica de olefinas pró-quirais como o estireno. Nesse trabalho descrevemos as relações entre as características do poliestireno e a estrutura do precursor do catalisador, de fato aqueles da família (RCp2TiCl2 (R = H, etila, iso-propila, n-propila, sec-butila, n-butila, iso-amila e ciclohexila. Todos os catalisadores são ativos para a produção de poliestireno acima de zero graus centígrados. A sindiotaticidade dos polímeros são dependentes da cadeia lateral dos anéis aromáticos do titanoceno e da temperatura da polimerização. A relação entre os fatores estéricos e eletrônicos do precursor do catalisador e os produtos de polimerização são apresentados e discutidos.

  9. Catalisadores sol-gel de Ni-SiO2 e Ni-Al2O3 aplicados na reforma de metano com CO2 = Ni-SiO2 and Ni-Al2O3 sol-gel catalysts applied to methane reforming with CO2

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    Giane Gonçalves

    2005-01-01

    Full Text Available A reação de reforma do metano com CO2 apresenta-se como um processopromissor de geração de gás de síntese e hidrogênio. Neste sentido, foram preparados catalisadores de níquel-sílica e níquel-alumina pelo método sol-gel, com carga metálica nominal de 8% em massa. Os catalisadores foram caracterizados por redução à temperatura programada, análise termogravimétrica e determinação da área superficial específica. A reação de reforma do metano com CO2 foi realizada em um micro-reator contendo 500 mg de catalisador, previamente ativado em uma mistura redutora contendo hidrogênio. Osensaios de reforma a seco do metano foram realizados a 800°C, na pressão atmosférica, por um período de 12 horas, com uma razão molar de alimentação de [CO2:CH4] = 6. Os produtos da reação foram analisados por cromatografia gasosa. Dentre os catalisadoresavaliados, nas condições de reação estudadas, o catalisador de níquel suportado em sílica foi o que apresentou o melhor desempenho.The dry reforming reaction of methane comes as a promising process of syngas and hydrogen. Nickel catalysts on Al2O3 and SiO2 were synthesized by sol-gel method, with metalic load of 8% weight. The catalysts were characterized by temperature programmed reduction (TPR, termogravimetry analysis (TGA and specific surface area measurements (BET. The dry reforming reaction was performed in a micro reactor packed with 500 mg of catalyst, previously activated in atmosphere of hydrogen. The dry reforming tests were done at 800oC and atmospheric pressure by a period of 12 hours, with a molar ratio in the feeding of [CO2:CH4] = 6. The products of the reaction were analyzed by gas chromatograph. The Ni-SiO2 catalysts showed better performance.

  10. Fosfatos e fosfanatos metálicos como catalisadores em processos oxidativos

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    Bispo, Cláudia Sofia dos Santos

    2008-01-01

    Esta dissertação descreve o trabalho desenvolvido sobre a síntese, caracterização e uso de fosfatos e fosfonatos metálicos como catalisadores, em reacções de oxidação, usando o peróxido de hidrogénio como agente oxidante. As potencialidades catalíticas de vários fosfatos e fosfonatos metálicos foram estudadas em transformações oxidativas, nomeadamente na oxidação de cetonas cíclicas e aldeídos aromáticos (Reacções de Baeyer-Villiger). Os catalisadores sintetizados foram o fosfato de zircónio ...

  11. Impregnação de catalisadores em suporte de espuma cerâmica de alumina

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    G. S. Falk

    2014-03-01

    Full Text Available Este trabalho teve por objetivo avaliar a impregnação de diferentes catalisadores na superfície de um material cerâmico de alumina. Para a confecção do material cerâmico, foi utilizada a rota de processamento de espumas cerâmicas pelo método da réplica, no qual uma esponja de poliuretano com porosidade de 60 ppi foi mergulhada em uma suspensão de alumina a fim de produzir uma cerâmica com a mesma morfologia que o material precursor. Inicialmente foram obtidas espumas cerâmicas de alumina com resistência mecânica média de 0,7 MPa e porosidade aparente de 80%.Três diferentes catalisadores (ZnAl2O4,ZnFe2O4 e Zn2SnO4 foram impregnados sobre esse suporte por meio do método dip coating.Os resultados mostraram que os catalisadores foram imobilizados sobre o suporte em baixas concentrações.

  12. Efeito de doadores de elétrons na polimerização de butadieno com catalisadores à base de neodímio Effect of electron donors on the polymerization of butadiene with Ziegler-Natta catalysts based on neodymium

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    Tereza C. J. Rocha

    2005-03-01

    Full Text Available Foi estudado um processo de polimerização de butadieno, em escala de laboratório, para a obtenção de polibutadieno com alto teor de unidades repetitivas 1,4-cis. Foi utilizado um sistema catalítico do tipo Ziegler-Natta ternário, constituído por versatato de neodímio (catalisador, hidreto de diisobutilalumínio (cocatalisador e cloreto de tert-butila (agente de cloração. O solvente utilizado foi uma mistura de hexano e ciclo-hexano (80/20 v/v. Foi estudado sistematicamente o efeito da presença de dois doadores de elétrons, tetra-hidrofurano (THF e tetrametiletilenodiamina (TMEDA. Os doadores de elétrons foram adicionados ao meio da polimerização e/ou à solução do preparo do catalisador. A proporção dos compostos doadores de elétrons variou entre 20 e 200 ppm para o THF e entre 0 e 15 ppm para o TMEDA. Observou-se o efeito dos doadores de elétrons sobre a estereosseletividade e a atividade do sistema catalítico, a massa molar e a distribuição de massa molar do polibutadieno obtido. Os polímeros foram caracterizados por espectroscopia na região do infravermelho, cromatografia por exclusão de tamanho e calorimetria diferencial de varredura. Foram obtidos polímeros com teores de unidades 1,4-cis variando entre 99,2% e 93%. A massa molar ponderal média, , variou de 2,2 a 7,0 x 10(5. A temperatura de transição vítrea dos polímeros se manteve em torno de -110 ºC.A laboratory scale process for producing polybutadiene with high content of cis-1,4 repeating units was studied. A Ziegler-Natta catalytic system constituted of neodymium versatate (catalyst, diisobutylaluminium hydride (cocatalyst and tert-butyl chloride (chlorinating agent was used. The solvent employed was a mixture of hexane and cyclohexane (80/20 v/v. The effect of two electron donors, tetrahydrofuran (THF and tetramethylethylenediamine (TMEDA, was studied. The electron donors were added to the polymerization medium and/or to the solvent employed in the

  13. Oxidação seletiva de benzeno a fenol utilizando catalisadores metaloporfirínicos = Selective oxidation of benzene to phenol with metaloporphyrins catalysts

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    Mara Heloisa Neves Olsen

    2007-01-01

    Full Text Available Complexos tetrafenilporfirínicos (5,10,15,20 meso-tetrafenilporfirina, TPP de cobre (II [CuII(TPP] e de ferro (III [FeIII(TPPCl] foram investigados como catalisadores na oxidação direta de benzeno a fenol em fase líquida, utilizando-se hidroperóxido de tercbutila e peróxido de hidrogênio como doadores de oxigênio. Os catalisadores foram sintetizados por metodologias já descritos na literatura e caracterizados por uma variedadede técnicas aqui apresentadas. Propondo sistemas variando o solvente, catalisador, concentração de substrato e concentração de agente oxidante, foi possível observar que o sistema catalítico mais promissor foi [FeIII(TPPCl] com peróxido de hidrogênio, emacetonitrila. Vários parâmetros reacionais tais como, razão molar substrato e do oxidante, concentração do catalisador e temperatura reacional foram estudados. O efeito do oxidante e o papel do solvente são abordados neste trabalho.Tetraphenylporphyrin (5,10,15,20 meso-tetraphenylporphyrin, TPP complexes containing copper (II [CuII(TPP] and iron (III [FeIII(TPPCl] have been investigated as catalysts in the direct oxidation of benzene to phenol, utilizing tert-butyl hydroperoxide andhydrogen peroxide, in liquid phase. The catalysts have been prepared by methods described in the literature and have been characterized by a variety of methods, presented in this work. The most promising catalytic system was [FeIII(TPPCl] with hydrogen peroxide, inacetonitrile. Various reaction parameters such as molar ratio of substrate, molar ratio of oxidant, catalyst concentration and reaction temperature have been studied. The effect of oxidant and the role of solvent are discussed in the present work.

  14. Pirólise catalítica do PEBD usando como catalisador a vermiculita modificada

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    Franciel Aureliano Bezerra

    2016-01-01

    Full Text Available Resumo O polietileno de baixa densidade (PEBD é um dos polímeros mais usados atualmente, e a grande quantidade desse polímero produzida resulta em toneladas de resíduos, que necessitam ser tratados. Neste trabalho foi realizada a pirólise termocatalítica do PEBD usando como catalisador a argila vermiculita modificada, como alternativa para o tratamento dos resíduos. A argila foi tratada com solução de ácido nítrico a diferentes concentrações e calcinada a 400 °C. Os materiais foram caracterizados por técnicas de difratometria de raios X, termogravimetria, adsorção de nitrogênio e espectroscopia de energia dispersiva. A pirólise térmica e termocatalítica foi realizada em um micro reator acoplado com GC/MS, a 500 °C. O intuito da pirólise de resíduos poliméricos é a obtenção de hidrocarbonetos leves (C<16, que possam ser empregados na indústria química e petroquímica, através de quebras na cadeia polimérica. Os resultados foram satisfatórios, com aumento no rendimento para hidrocarbonetos leves ao empregar os catalisadores chegando a 71,4% de produtos com C<16, enquanto a pirólise térmica resultou apenas de 25,8%.

  15. A DRIFTS study of the partial oxidation of ethanol on Rh catalysts; Estudo da oxidacao parcial do etanol em catalisadores de Rh por DRIFTS

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    Oliveira, Raquel Lima; Passos, Fabio Barboza, E-mail: fbpassos@vm.uff.br [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Departamento de Engenharia Quimica e de Petroleo

    2013-09-01

    The partial oxidation of ethanol on {gamma}-Al{sub 2}O{sub 3}, CeO{sub 2}, ZrO{sub 2} and Ce{sub x}Zr{sub 1-x}O{sub 2} supported rhodium catalysts was investigated by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The catalysts were characterized by temperature-programmed reduction (TPR) and cyclohexane dehydrogenation. DRIFTS studies on the partial oxidation of ethanol showed that ethanol is adsorbed dissociatively, through O-H bond breaking, with the formation of ethoxy species, followed by successive dehydrogenation to acetaldehyde and acetyl species. Further oxidation to acetate and carbonate species lead to the formation of CO, CH{sub 4} and H{sub 2} by decomposition. The presence of CeO{sub 2} in the catalysts favored the oxidation steps due to its oxygen storage capacity. (author)

  16. Suportes poliméricos para catalisadores sulfônicos: síntese e caracterização

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    Coutinho Fernanda M. B.

    2004-01-01

    Full Text Available Suportes poliméricos foram sintetizados por meio da copolimerização de estireno (S e divinilbenzeno (DVB em suspensão aquosa na presença de misturas diluentes constituídas por tolueno e n-heptano, solventes esses considerados como bom e mau para o polímero respectivamente, em composições variadas. Foram usados dois teores de DVB (60 e 80% e dois graus de diluição (100 e 200%. Os suportes foram caracterizados no estado seco e no estado inchado e suas propriedades foram relacionadas com os parâmetros de síntese. No estado seco, os copolímeros foram analisados quanto à densidade aparente, à área específica, ao volume de poros e à morfologia. No estado inchado foi observado o comportamento dos copolímeros em tolueno e em n-heptano. Neste trabalho são comentadas as vantagens do uso desses suportes para a preparação de catalisadores sulfônicos e se faz uma comparação entre esses catalisadores e os catalisadores homogêneos convencionais comumente usados em sínteses orgânicas.

  17. Preparation of PtSnCu/C and PtSn/C electrocatalysts and activation by dealloying processes for ethanol electrooxidation; Preparacao de eletrocatalisadores PtSnCu/C e PtSn/C e ativacao por processos de dealloying para aplicacao na oxidacao eletroquuimica do etanol

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    Crisafulli, Rudy

    2013-06-01

    PtSnCu/C (with different Pt:Sn:Cu atomic ratios) and PtSn/C (50:50) electrocatalysts were prepared by borohydride (BR) and alcohol-reduction (AR) processes using H{sub 2}PtCl{sub 6}.6H{sub 2}O, SnCl{sub 2}.2H{sub 2}O and CuCl{sub 2}.2H{sub 2}O as metal sources, NaBH{sub 4} and ethylene glycol as reducing agents, 2-propanol and ethylene glycol/water as solvents and carbon black as support. In a further step, these electrocatalysts were activated by chemical (CD) and electrochemical (ED) dealloying processes through acid treatment and thin porous coating technique, respectively. These materials were characterized by energy dispersive X-ray, Xray diffraction, transmission electron microscopy, line scan energy dispersive Xray and cyclic voltammetry. Electrochemical studies for ethanol electro-oxidation were performed by cyclic voltammetry, chronoamperometry and in single Direct Ethanol Fuel Cell using Membrane Electrode Assembly (MEA). The anodic effluents were analysed by gas chromatography. The X-ray diffractograms of the as-synthesized electrocatalysts showed the typical face-centered cubic structure (FCC) of platinum and its alloys. After dealloying, the X-ray diffractograms showed that the Pt FCC structure was preserved. The crystallite sizes of the assynthesized electrocatalysts were in the range of <=2 nm to 3 nm and after dealloying there were no significant variations in sizes. The energy dispersive Xray analysis of the as-synthesized electrocatalysts showed a Pt:Sn and Pt:Sn:Cu atomic ratios similar to the nominal values. After chemical and electrochemical dealloying of the electrocatalysts the ranged Pt:Sn and Pt:Sn:Cu atomic ratios showed that Cu and Sn atoms were removed. However, chemical dealloying process proved to be more efficient for removing Cu and electrochemical dealloying for removing Sn. The line scan energy dispersive X-ray analysis showed that acid and electrochemical treatments were efficient to dealloying Cu and/or Sn superficial atoms of

  18. Aplicação de resinas sulfônicas como catalisadores em reações de transesterificação de óleos vegetais Evaluation of sulfonic resins as catalysts in transesterification of vegetable oils

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    Simone M. de Rezende

    2005-07-01

    Full Text Available Diferentes suportes poliméricos à base de estireno (S e divinilbenzeno (DVB foram sintetizados e suas morfologias caracterizadas por microscopia óptica e eletrônica de varredura. Foram preparados e caracterizados catalisadores sulfônicos a partir desses suportes e suas atividades catalíticas foram avaliadas na transesterificação de óleo vegetal com metanol. Os resultados obtidos com esses catalisadores foram comparados com os produzidos com uma resina sulfônica comercial. Verificou-se que os catalisadores sintetizados neste trabalho apresentaram desempenhos próximos ao da resina comercial.Different polymer supports based on styrene (S and divinylbenzene (DVB were synthesized and their morphology was characterized by optical and scanning electron microscopy. Sulfonic catalysts were prepared from these supports, characterized and their activities were evaluated in vegetal oil transesterification with methanol and compared with the performance of a commercial sulfonic resin. The synthesized catalysts showed results close to the commercial resin.

  19. Influência do envelhecimento de catalisadores Ziegler-Natta à base de neodímio sobre a polimerização de 1,3-butadieno Influence of ageing of neodymium based Ziegler-Natta catalyst on butadiene polymerization

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    Ivana L. Mello

    2007-03-01

    Full Text Available Catalisadores envelhecidos em diferentes tempos (0, 5, 15, 40, 80 e 160 dias e diferentes temperaturas (10, 25 e 40 °C foram testados na polimerização 1,4-cis do 1,3-butadieno. Avaliou-se a atividade catalítica bem como as características do polímero obtido (massa molecular e microestrutura. Os resultados encontrados mostraram que a variação nas condições de envelhecimento dos catalisadores não influenciou a microestrutura do polímero. O teor de unidades 1,4-cis permaneceu em torno de 98%, de unidades 1,4-trans em torno de 1,4% e de unidades vinílicas em 0,6%. Entretanto, reações utilizando os catalisadores envelhecidos por 40 dias forneceram polibutadieno com maior massa molecular do que os demais catalisadores. Verificou-se também, uma tendência de maiores conversões das polimerizações com os catalisadores envelhecidos a 25 °C.Catalysts aged for different time periods (0, 5, 15, 40, 80 and 160 days and different temperatures (10, 25 and 40 °C were tested in the cis-1,4 polymerization of 1,3-butadiene. The catalytic activity and polymer characteristics (molecular weight and microstructure were evaluated. The results showed that the catalyst ageing did not affect the polymer microstructure. The cis-1,4 content remained at 98%, trans-1,4 at 1,4% and vinyl units at 0,6%. However, the catalysts aged for 40 days produced polybutadienes with higher molecular weight. Also observed was a tendency to an increased polymerization conversion by the catalysts aged at 25 °C.

  20. Catalisadores Sulfônicos Imobilizados em Polímeros: Síntese, Caracterização e Avaliação

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    Coutinho Fernanda M.B.

    2001-01-01

    Full Text Available Suportes poliméricos à base de estireno (Sty e divinilbenzeno (DVB foram preparados por polimerização em suspensão aquosa em presença de diluente (mistura de tolueno e n-heptano em composição variada em um grau de diluição de 100 % e com quatro teores diferentes de DVB (10, 20, 40 e 60 %. Os suportes foram caracterizados nos estados seco e inchado. No estado seco foram analisados quanto à densidade aparente, área específica, volume de poros e morfologia, e no estado inchado foi observado o comportamento em dois diferentes tipos de solventes, um bom e um mau solvente para o copolímero de estireno-divinilbenzeno. As propriedades dos suportes poliméricos, nos estados seco e inchado, foram relacionadas com os parâmetros de síntese. Os suportes poliméricos foram sulfonados em presença de solvente capaz de inchar a rede polimérica (1,2-dicloroetano. Os catalisadores sulfônicos obtidos foram caracterizados no estado seco e inchado e a atividade catalítica foi avaliada em reações de esterificação de ácido acético com n-butanol. Também foi avaliado o efeito da reciclagem dos catalisadores na sua atividade catalítica.

  1. Estudo da polimerização do 2-metil, 1,3-butadieno via catalisadores lantanídicos: influência do tipo de alquilalumínio, da temperatura reacional e da concentração do catalisador Polymerization of 2-methyl, 1,3-butadiene via lanthanides catalysts: influence from the type of alkylaluminum, concentration and reaction temperature and catalyst

    Directory of Open Access Journals (Sweden)

    André L. C. Simões

    2011-01-01

    Full Text Available Os catalisadores lantanídicos são muito eficientes na polimerização estereoespecífica de dienos, principalmente aqueles à base de neodímio. Neste trabalho será apresentado o estudo da polimerização do 2-metil, 1,3-butadieno com catalisadores à base de neodímio, utilizados comercialmente na polimerização do 1,3-butadieno. Foi estudado o efeito da temperatura, do tipo de alquilalumínio e da concentração de catalisador. As reações foram realizadas em reator de aço inox sob atmosfera inerte, usando como solvente o hexano e uma concentração de 2-metil, 1,3-butadieno de 12%. Foram obtidos polímeros com massas molares na faixa de 1,0 a 1,5 × 105 e teor de unidades repetitivas cis em torno de 97%.The rare earth metals catalysts are very efficient in stereospecific polymerization of dienes, especially those of neodymium. This paper reports on the polymerization of 2-methyl, 1,3-butadiene with catalysts of neodymium, used commercially in polymerization of 1,3-butadiene. Effects were studied from the temperature, type of alkylaluminum, and from the concentration of catalyst. The reactions were carried out in a stainless steel reactor under an inert atmosphere, using hexane as the solvent and a concentration of 12% of 2-methyl, 1,3-butadiene. Polymers were obtained with molecular weight from 1.0 to 1.5 × 105, with ca. 97% of cis repeating units.

  2. Síntese de acetato de celulose a partir da palha de feijão utilizando N-bromossuccinimida (NBS como catalisador

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    Sarah S. Brum

    2012-01-01

    Full Text Available Neste estudo a celulose obtida da palha de feijão foi utilizada para produzir um material hidrofóbico (acetato de celulose para ser avaliado como absorvente de óleo. Nas reações de acetilação foram utilizados anidrido acético e dois catalisadores, a piridina (PY e N-bromossuccinimida (NBS. Os materiais produzidos foram caracterizados por espectroscopia na região do infravermelho médio, microscopia eletrônica de varredura, difratometria de raios-X e análise elementar. O NBS mostrou-se mais eficiente que a PY e, seu uso resultou em materiais com maiores quantidades de grupos acetatos, mais hidrofóbicos e com maiores capacidades de absorção de óleo de soja.

  3. Estudo Comparativo de Polimerização de Propileno com Diferentes Catalisadores Metalocênicos Através de um Planejamento de Experimentos Comparative Study of Propylene Polymerization with Different Metallocene Catalysts Using a Statistic Experimental Planning Model

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    Maria de Fátima V. Marques

    2002-01-01

    Full Text Available Neste trabalho, o desempenho dos catalisadores SiMe2(Ind2ZrCl2, Et(Ind2ZrCl2, SiMe2(Ind2HfCl2 e Et(Ind2HfCl2 na polimerização de propileno usando MAO como cocatalisador empregando-se um Planejamento estatístico de experimentos foi avaliado. As polimerizações foram realizadas em diferentes temperaturas e razões molares alumínio/metal de transição. O efeito destas variáveis na atividade de cada catalisador e nas características do polipropileno obtido foi melhor investigado utilizando-se os modelos propostos para cada variável. Foram observadas influências significativas das condições experimentais principalmente na atividade catalítica, bem como no peso molecular ponderal médio, temperatura de fusão e percentagem de isotaticidade dos polímeros obtidos. A partir dos modelos propostos através do tratamento estatístico realizado pode-se observar que os catalisadores a base de zircônio são os de maior atividade catalítica, enquanto que os hafnocenos produzem polipropileno com peso molecular mais elevado. Os complexos com ponte dimetil-silânica produziram polipropileno com maior peso molecular, estereorregularidade e maior temperatura de fusão do que os similares com ponte etilidênica.In this work, the performance of the catalysts SiMe2(Ind2ZrCl2, Et(Ind2ZrCl2, SiMe2(Ind2HfCl2 e Et(Ind2HfCl2 on propylene polymerization using MAO as cocatalyst and employing a Statistic Experimental Planning Model was evaluated. The polymerizations were carried out at different temperatures and aluminum/transition metal molar ratios. The effect of these variables on the catalyst activity and on the polymer characteristics was investigated using the proposed models for each variable. A significant influence was observed of the experimental conditions on the catalyst activity in particular, but also on the weight-average molecular weight, melting point and isotacticity of the polypropylenes produced; the statistical analysis with the proposed

  4. Efeito do envelhecimento de catalisadores Ziegler-Natta à base de neodímio sobre a polimerização de 2-metil, 1,3-butadieno Effect of aging time of Ziegler-Natta catalysts based on neodimium for 2-methyl, 1,3-butadiene polymerization

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    André Luiz Carneiro Simões

    2013-01-01

    Full Text Available O objetivo deste trabalho foi estudar o efeito do tempo de envelhecimento natural do sistema catalítico versatato de neodímio/hidreto de di-isobutilalumínio/cloreto de t-butila sobre a polimerização de 2-metil, 1,3-butadieno (isopreno. Foram avaliadas a atividade catalítica e conversão, além da massa molar, distribuição de massa molar e microestrutura dos polímeros. Foi objetivo estudar também as características micro e macroestruturais do poli-1,4-cis-isopreno ao longo da polimerização. Os catalisadores envelhecidos apresentaram tempos mais curtos ao longo da polimerização e uma conversão mais alta em relação ao catalisador não envelhecido. Estes resultados em conjunto com a menor atividade catalítica nos catalisadores envelhecidos sugerem a provável desativação de alguns sítios ativos mais sensíveis. Não foi observada influência do envelhecimento do catalisador sobre a microestrutura do polímero. Houve também aumento da massa molar e estreitamento na polidispersão conforme o aumento da conversão.The goal of this work was to study the aging effects of the catalytic system neodymium versatate/diisobutylaluminium hydride/t-butyl chloride on 2-methyl, 1.3-butadiene (isoprene polymerization. The catalytic activity, conversion and polymer characteristics (molar mass, molar mass distribution and microstructure were evaluated. The macro and microstructural characteristics of poly-1.4-cis-isoprene along the polymerization were also studied. The aged catalysts have shorter times along the polymerization and a higher conversion than the non-aged catalyst. Together with the lower catalytic activity for aged catalysts, these results point to possible disabling of the most sensitive active sites. Aging of the catalyst did not affect the polymer microstructure. As the conversion progressed, the molar mass increased with a narrowing in the molecular weight distribution.

  5. Estudo da preparação do catalisador Cp2ZrCl2 suportado em sílica utilizando um planejamento de experimentos Preparation conditions of Cp2ZrCl2 supported on silica using an experimental planning

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    Anunciata Conte

    2001-03-01

    Full Text Available O monômero eteno foi polimerizado através dos sistemas catalíticos Cp2ZrCl2/SiO2 e Cp2ZrCl2/MAO/SiO2. Foi elaborado um planejamento estatístico de experimentos a fim de se identificar as melhores condições de preparo dos catalisadores heterogêneos. As variáveis utilizadas foram a concentração de metilaluminoxano (MAO no pré-tratamento do suporte, a concentração e a temperatura de imobilização do metaloceno. Os catalisadores suportados foram analisados por espectrometria de emissão com plasma acoplado indutivamente e as resinas produzidas foram caracterizadas por cromatografia de permeação em gel (GPC e calorimetria de varredura diferencial (DSC. Foi observado que quanto maior a concentração de zircônio fixada na superfície do suporte, menor foi a atividade catalítica, na faixa de variáveis estudadas.Ethylene was polymerized with the catalytic systems Cp2ZrCl2/SiO2 and Cp2ZrCl2/MAO/SiO2. A experimental planning model was developed in order to identify the best conditions for the preparation of metallocene heterogeneous catalysts. The variables used were methylaluminoxane (MAO concentration of the support treatment, concentration and temperature of metallocene immobilization. The supported catalysts were analyzed by inductively coupled plasma emission spectometry and the polyethylene (PE produced was characterized by gel permeation calorimetry (GPC and differential scanning calorimetry (DSC. It was observed that the higher the zirconium concentration fixed on the support surface, the lower the catalyst activity, in the studied variables range.

  6. Síntese de acetato de celulose a partir da palha de feijão utilizando N-bromossuccinimida (NBS como catalisador Synthesis of cellulose acetate from the bean straw using N-bromosuccinimide (NBS as catalyst

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    Sarah S. Brum

    2012-01-01

    Full Text Available Neste estudo a celulose obtida da palha de feijão foi utilizada para produzir um material hidrofóbico (acetato de celulose para ser avaliado como absorvente de óleo. Nas reações de acetilação foram utilizados anidrido acético e dois catalisadores, a piridina (PY e N-bromossuccinimida (NBS. Os materiais produzidos foram caracterizados por espectroscopia na região do infravermelho médio, microscopia eletrônica de varredura, difratometria de raios-X e análise elementar. O NBS mostrou-se mais eficiente que a PY e, seu uso resultou em materiais com maiores quantidades de grupos acetatos, mais hidrofóbicos e com maiores capacidades de absorção de óleo de soja.In this work, cellulose from beans straw was used to produce a more hydrophobic material (cellulose acetate for use as oil absorbent. Acetic anhydride was used in the reactions with two catalysts, pyridine (PY and N-bromosuccinimide (NBS. The materials produced were characterized by infrared spectroscopy, scanning electron microscopy, X-ray diffraction and elemental analysis. NBS proved more efficient than PY, with the resulting materials containing higher number of acetate groups, being more hydrophobic and with higher capacity to absorb soybean oil.

  7. Avaliação das condições de envelhecimento do sistema catalítico versatato de neodímio/hidreto de di-isobutilalumínio/cloreto de t-butila na polimerização de 1,3-butadieno

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    Neusa Maria Tocchetto Pires

    2014-01-01

    Full Text Available O objetivo deste trabalho foi estudar sistemas catalíticos ternários constituídos por versatato de neodímio, cloreto de t-butila e hidreto de di-isobutil-alumínio para a polimerização de 1,4-cis de butadieno em hexano. Foi investigado o efeito do envelhecimento natural do catalisador (1 a 60 dias a 8,5°C sobre a conversão, a atividade catalítica e a micro- e macroestrutura do polibutadieno. Foi estudado também o efeito do envelhecimento forçado (40°C, das diferentes fases do preparo do catalisador sobre as características da polimerização e do polímero sintetizado. Os polímeros foram caracterizados por cromatografia de exclusão por tamanho (SEC, espectroscopia na região do infravermelho (FT-IR, viscosimetria em solução e no estado fundido. O envelhecimento forçado das diferentes fases do catalisador (F1, F2, F3 e F4 afetou a conversão e a atividade catalítica de maneiras distintas. Os resultados de conversão e atividade catalítica mostraram que a fase mais afetada pelo envelhecimento forçado a 40°C foi a F1, etapa em que o versatato de neodímio é adicionado à solução de hidreto de di-isobutil-alumínio (Catalisador 447. A microestrutura não se alterou com o envelhecimento natural do catalisador enquanto que a macroestrutura mostrou dependência desta variável. Foi observado um ligeiro aumento na conversão e na atividade catalítica à medida que o tempo de envelhecimento do catalisador aumentou de 1 para 10 dias.

  8. Influence of the fuel in the nanostructure catalyzer oxides synthesis; Influencia do combustivel na sintese de oxidos catalisadores nanestruturados

    Energy Technology Data Exchange (ETDEWEB)

    Zampiva, R.Y.S.; Panta, P.C.; Carlos, R.B.; Alves, A.K.; Bergmann, C.P., E-mail: rubiayoungsun@gmail.com [Universidade Federal do Rio Grande do Sul (LACER/UFRGS), Porto Alegre, RS (Brazil). Lab. de Ceramicos

    2012-07-01

    Among the techniques used in catalysts production, the solution combustion synthesis (SCS) has been increasingly applied due the possibility of producing, at low cost, highly pure and homogeneous nanostructured powders. The smaller the particle diameter, the greater the activity of the catalyst. In SCS, the size of the particles produced depends on the process variables. In order to formulate the optimal methodology for the preparation of nanostructured oxides for catalysis, it was studied the fuel-oxidant concentration ratio, and the use of glycine and polyethylene glycol with molecular weight 200 (PEG 200) as fuel in the SCS of Iron, Magnesium and Molybdenum based catalysts. The phase identification of the products was performed by x-ray diffraction (XRD). Particle size and surface area analysis were done to characterize the particles size and the samples morphology was obtained by scanning electron microscopy. Results indicated the formation of high purity nanomaterials obtained for low concentrations of fuel, and a wide variation in the nanostructure sizes depending on the concentration and type of fuel used. (author)

  9. New heterogeneous acid catalysts in the synthesis of biodiesel; Estudo de novos catalisadores heterogeneous acidos na sintese de biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Soldi, Rafael A.; Cesar-Oliveira, Maria Aparecida F. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Dept. de Quimica. Lab. de Polimeros Sinteticos], e-mail: mafco@quimica.ufpr.br; Oliveira, Angelo R.S.; Ramos, Luiz P. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Dept. de Quimica. Centro de Pesquisa em Quimica Aplicada (CEPESQ)

    2007-07-01

    In this work, sulfonated polystyrene compounds (PSS) were synthesized from linear polystyrene (PS). Several methods and experimental conditions were investigated for the sulfonation of PS, producing catalytically active polymeric materials with sulfonation degrees in the range of 5.0-6.2 mmol -SO{sub 3}H/g of dry polymer. The performance of these catalysts was evaluated in transesterification reactions of beef tallow and vegetable oils with ethanol and methanol. For the sake of comparison, the same reaction conditions employed for the PSS catalysts were also used for an Amberlyst 15 (3,7 mmol SO{sub 3}H/g - Aldrich). The PSS samples were shown to be insoluble in the reaction media, leading to conversion rates of 85%, 75% and 80% of the refined soybean oil, beef tallow and crude corn oil in to ethyl esters, respectively, and 94% of the refined soybean oil methyl esters. Amberlyst 15 was studied as an alternative to the process, but its conversion rate to alkyl esters was very low in the employed conditions. These results demonstrated that our synthetic PSS materials have a great potential to act as heterogeneous catalysts for transesterification. (author)

  10. Inserção de catalisador híbrido na síntese de beta-tiocetonas

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    Mariana Pompilio Darbem

    2012-06-01

    Full Text Available The Michael reaction (or Michael addition involves the addition of a nucleophile, called Michael donor, to an electrophile (α,β-unsaturated, called Michael acceptor. Literature reports several types of nucleophiles applied in this reaction. Among them we can mention compounds containing a sulfur atom. When these nucleophiles are applied to this reaction, it is called as thia-Michael reaction. In this study thiophenol, p- chlorothiophenol and p-methoxythiophenol were tested as Michael donors, and several ketones and aldehydes as Michael acceptors, in order to obtain the formation of sigma bonds carbon-sulfur. Compounds that have in their structure the C-S bond are extremely important, because they can present, for example, antibiotic action, antimicrobial analgesic, and anti-HIV. This research proposes, besides the obtainment of  many beta-thioketonic compounds, the insertion of a new catalyst in thia-Michael reactions, the bis-L-zinc prolinate. This catalyst provided the obtainment of high yield compounds. The reactions were executed using ultrasound, which caused a significant decrease in the reaction time and an increase in the results obtained when compared with data obtained previously in literature. An important fact in this study is that the catalyst used is not soluble in the reaction media and it can be reused without abrupt loss of yield.

  11. Desempenho de catalisadores com Nb2O5 para produção de hidrogênio a partir da reforma de etanol com vapor d’água

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    Nádia Regina Camardo Fernandes Machado

    2002-04-01

    Full Text Available Reforma de etanol com vapor d’água, para produção de hidrogênio, foi estudada sobre catalisadores Cu/Nb2O5 e Cu/Nb2O5/Al2O3. Eles foram preparados por impregnação, com diferentes concentrações de cobre e Nb2O5. Um catalisador comercial, Cu/ZnO/Al2O3 (G66, de reforma do metanol, foi usado para comparação. Dados de redução à temperatura programada mostraram incompleta redução do cobre, com formação de dois picos de redução diferentemente do CuO mássico, cuja redução ocorre em uma única etapa (somente um pico, evidenciando que o cobre é modificado ao ser suportado sobre Nb2O5. Resultados de espectroscopia de reflectância difusa também evidenciam a interação. Testes catalíticos mostraram que a dispersão do pentóxido de nióbio sobre alumina melhorou a ação do catalisador, uma vez que os catalisadores ternários são os que apresentam maior produção de hidrogênio, apesar de também produzirem éter etílico como subproduto. Os catalisadores binários não catalisam reações paralelas, provavelmente, porque, quando Cu/Nb2O5 está disperso sobre alumina, há formação de um novo sítio ativo o qual produz éter etílico.

  12. Uma revisão sobre polimerização de olefinas usando catalisadores Ziegler-Natta heterogêneos A survey on olefins polymerization using heterogeneous Ziegler-Natta catalysts

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    Fabricio Machado

    2011-01-01

    Full Text Available A produção em larga escala de materiais poliméricos de elevado interesse industrial, provenientes da polimerização estereoespecífica de olefinas, tornou-se possível depois do advento dos catalisadores Ziegler-Natta. Classificados genericamente em seis gerações, esses catalisadores apresentam diferentes desempenhos em relação ao grau de especificidade do polímero, à atividade e ao controle de morfologia da partícula, o que propicia o desenvolvimento de resinas poliolefínicas com características e propriedades muito variadas. O objetivo principal desse trabalho é revisar e discutir algumas das questões fundamentais que estão relacionadas com as reações de polimerização de olefinas realizadas com catalisadores heterogêneos. Dá-se ênfase particular aos fatores determinantes para a condução apropriada dos processos industriais, como, por exemplo, a fragmentação controlada do catalisador, o fenômeno de replicação das características estruturais do catalisador e o controle da morfologia da partícula de polímero, a importância da prepolimerização e os efeitos relacionados à transferência de calor e massa durante a reação. Discutem-se também aspectos relacionados à modelagem dos sistemas de polimerização e às técnicas experimentais usadas para o estudo do fenômeno de fragmentação das partículas de catalisador.Large-scale production of polymer materials of high industrial value through stereospecific polymerization of olefins became possible only after the advent of Ziegler-Natta catalysts. Usually grouped into six different generations, these catalysts present distinct activity and allow for production of polymer materials with distinct degrees of stereospecificity, morphology and end-use properties. The main objective of this work is to review and discuss some of the fundamental issues related to olefins polymerization reactions performed with heterogeneous catalysts. Particular emphasis is given to

  13. UTILIZANDO NANOTUBOS DE TiO2 COMO FOTOCATALISADOR NA DEGRADAÇÃO DO CORANTE VERMELHO CONGO

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    Nilmalice Coelho Rocha

    2011-02-01

    Full Text Available Nanotubos de TiO2 foram sintetizados em um sistema hidrotérmico. Os nanomateriais foram caracterizados por microscopia eletrônica de varredura (MEV e área superficial. O TiO2 anatase e os nanotubos de TiO2 foram utilizados no processo de fotodegradação do corante vermelho congo. A capacidade de fotodegradação de ambos catalisadores foram comparadas. O corante foi degradado por 90 minutos, utilizando ambos catalisadores, estes apresentaram alta atividade catalítica próximo ao pH 2. A capacidade de fotodegradação do corante utilizando TiO2 anatase e nanotubos de TiO2 em meio iônico mostrou-se favorável com a adição de NaCl na concentração de 0,03 mol/L.

  14. Introdução de catalisadores metalocênicos como estratégia competitiva da indústria de termoplásticos The introduction of metallocene catalysts as a competitive strategy of the thermoplastic industry

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    Francisco A. Ribeiro Fº

    1997-09-01

    Full Text Available Recentes inovações tecnológicas no setor de polímeros levaram a novos catalisadores que poderão mudar a estrutura de toda a indústria. É feita uma análise das estratégias competitivas adotadas pelas empresas do setor e do impacto que a adoção dos catalisadores metalocênicos vêm causando.Recent technological innovation in the polymer sector has produced new catalysts, which may change the structure of the industry. Competitive strategies adopted by these companies are analysed as well as the impact caused by the adoption of metallocene catalysts.

  15. Caracterização textural, morfológica e estrutural de catalisadores automotivos novos e usados Textural, morphological and structural characterization of new and used automotive catalysts

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    R. A. Silva

    2009-06-01

    Full Text Available Conversores catalíticos ou catalisadores automotivos são formados por metais nobres como platina, paládio, ródio e molibdênio, suportados em filmes de alumina depositados em cordierita, um material cerâmico poroso, os quais convertem gases poluentes em dióxido de carbono, água e nitrogênio, produtos não poluentes. Neste trabalho, é discutida a desativação de catalisadores automotivos devido às altas temperaturas de operação e por contaminação inorgânica originária dos combustíveis e óleos utilizados. Catalisadores novos e usados foram analisados por adsorção gasosa, picnometria, difração de raios X, e microscopia eletrônica de varredura para caracterizações texturais, morfológicas e estruturais. Microssonda eletrônica foi utilizada para detectar a composição dos catalisadores e dos seus contaminantes.Catalytic converters or automotive catalyst are formed by noble metals such as platinum, rhodium, palladium, and molybdenum supported in cordierite, a porous ceramic materials which convert the pollutant gases in carbon dioxide, water and nitrogenous, no-pollutant products. In this work, we discuss the deactivation of automotive catalyst due to the high operation temperature and by inorganic contaminants originating in engine oil and fuel. New and used catalysts were analyzed by gas adsorption, picnometry, X-ray diffraction, thermal analyses and scanning electron microscopy for textural, morphological and structural characterization. EDS and WDS electron microprobe were used to detect the composition of the catalysts and their contaminants.

  16. Catalisadores cerâmicos de ZnAl2-xFe xO4: síntese de pós nanométricos e sua caracterização ZnAl2-xFe xO4 ceramic catalysts: synthesis and characterization of nanosize powders

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    R. P. T. Lula

    2005-06-01

    Full Text Available Nos últimos anos têm-se observado um crescente interesse na redução catalítica direta de SOx para enxofre elementar por vários agentes redutores tais como CO, metano ou gases sintéticos. Os óxidos metálicos mistos são uma importante classe de materiais catalíticos mundialmente investigados em diferentes campos de aplicações. Nesse contexto este trabalho tem como objetivo a sintetização por reação de combustão e a caracterização de catalisadores ZnAl2-xFe xO4, x = 0,0/0,75/1,0/1,25/1,5/1,75. Os pós resultantes foram caracterizados por medidas de densidade, área superficial por adsorção gasosa pelo método BET, difração de raios X e microscopia eletrônica de varredura. Os resultados mostram que foi possível obter pós monofásicos com tamanho de partículas nanométrico. O aumento da substituição dos íons de Al3+ por Fe3+ provocou uma elevação da área superficial e consequentemente uma diminuição do tamanho de partícula (82,74 - 30,94 nm. Desta forma os catalisadores com maior teor de Fe3+ são adequados para atuar na redução de gases de emissão provenientes da indústria petrolífera.In recent years, increasing interest has focused on direct catalytic SOx reduction of elementary sulfur by several reducing agents such as CO, methane and synthetic gases. Mixed metallic oxides are an important class of catalytic materials investigated worldwide for application in a variety of fields. In this context, this work focused on the synthesis by combustion reaction and characterization of ZnAl2-X Fe xO4 catalysts, x = 0.0, 0.75, 1.0, 1.25, 1.5, and 1.75. The resulting powders were characterized by their density and surface area measured by BET, X-ray diffraction and scanning electron microscopy. Our findings indicate that single phase powders comprised of nanosized particles were obtained. Increasing the amount of Fe3+ ions replacing Al3+ ions caused the surface area to increase, thereby reducing the particle size (82

  17. Redução do tempo de digestão na determinação de nitrogênio em solos Reduction of digestion time in the determination of total nitrogen in soils

    Directory of Open Access Journals (Sweden)

    Flávio Verlengia

    1968-01-01

    Full Text Available Foi estudada a redução do tempo de digestão na determinação do nitrogênio total em solos, assim como a perda dêsse nutriente durante a sua determinação. Procurou-se comparar o efeito de alguns catalisadores, como sulfato de cobre, óxido de mercúrio e selênio. Diversos tempos de ataques foram estudados, desde 10 até 960 minutos (16 horas. Verificou-se que as maiores reduções de tempo foram obtidas com o selênio, utilizado como catalisador, em presença de óxido de mercúrio, particularmente em solos onde o ataque se mostrou mais difícil. O catalisador tradicional - sulfato de cobre - foi o menos eficiente. A utilização do selênio, não provocou perda de nitrogênio durante a digestão.By using the Kjeldahl method in the determination of total nitrogen in soils, the effect of various catalysts related with digestion time and with possible nitrogen losses was studied. The experiment was carried out by using the catalysts CuSO4.5H2O; HgO and Se in six treatments. Results indicated that a pronounced reduction on digestion time was obtained by using selenium as catalyst. Best results, however, were obtained by using a mixture of selenium and mercury oxide, principally for soils of very difficult digestion (organic soil and "terra roxa" soil. In all treatments CuSO4.5H2O was the less efficient. Use of selenium did not cause loss of nitrogen.

  18. As mudanças na enfermagem: a representaçao de enfermeiras acerca das mobilizações institucionais

    Directory of Open Access Journals (Sweden)

    Vilanice Alves de Araújo Püschel

    2002-06-01

    Full Text Available Grandes mudanças têm ocorrido na sociedade. Procurou-se, neste estudo, mostrar a representação das enfermeiras acercadas mudanças na Enfermagem inseridas no contexto institucional. Para tanto, foram entrevistadas dezoito enfermeirasde um hospital de ensino, público, especializado em cardiologia. Através da análise de conteúdo, conforme proposta de Bardin9, foi construído o esquema representacional que mostra o tempo do concreto e o tempo do desejo, sendo que, para se adaptar ao novo tempo existe um compasso entre os limites e os elementos catalisadores do processo de mudanças, enquanto projeto de vir a ser um novo ser profissional, para se chegar à existência auto-sustentada.

  19. Enzimas na alimentação de suínos Enzymes in feeds for swine

    OpenAIRE

    Francisco Antonio Tenorio Fireman; Alba Kyonara Barbosa Alves Tenório Fireman

    1998-01-01

    Enzimas são proteínas globulares de estrutura terciária ou quaternária que agem como catalisadores bilógicos e estão envolvidas em todos os processos do metabolismo animal. As enzimas comercialmente produzidas são provenientes, geralmente, de bactérias do gênero Bacillus sp ou fungos do gênero Aspergillus sp. Os efeitos benéficos de sua utilização na alimentação de suínos têm sido observados por pesquisadores de todo o mundo. Este artigo objetiva abordar os efeitos do uso de enzimas em vários...

  20. Preparation of PtRu/C anode electrocatalysts using gamma radiation for methanol electro-oxidation; Preparacao de eletrocatalisadores PtRu/C utilizando radiacao gama para aplicacao como anodo na oxidacao direta de metanol

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Dionisio Fortunato da

    2006-07-01

    Pt Ru/C (carbon-supported Pt Ru nanoparticles) anode electrocatalysts were prepared using radiolytic process (gamma radiation) and tested for methanol electro-oxidation. In this process, water/2-propanol and water/ethylene glycol solutions containing the metallic ions and the carbon support were submitted to gamma radiation under stirring. The water/alcohol ratio (v/v) and the total dose (kGy) were studied. A nominal Pt Ru atomic ratio of 50:50 were used in all experiments. The electrocatalysts were characterized by energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry (CV). The electro-oxidation of methanol was studied by cyclic voltammetry using the thin porous coating technique. The electrocatalysts prepared in water/2-propanol showed crystallite size in the range of 3-5 nm and Pt Ru atomic ratio of 50:50. The electrocatalysts prepared in water/ethylene glycol showed crystallite size (2-3 nm) smaller than the ones obtained in water/2-propanol, however, the Pt Ru atomic ratios obtained were approximately 80:20, showing that only part of ruthenium ions were reduced. For methanol oxidation the electrocatalytic activity depends on the water/2-propanol and water/ethylene glycol ratio used in the reaction medium. The electrocatalysts prepared in water/2-propanol showed inferior performance to the ones prepared in water/ethylene glycol, which showed similar or superior performances (amperes per gram of platinum) to the commercial electrocatalyst from E-TEK. (author)

  1. Methyl biodiesel from Dipteryx lacunifera: preparation, characterization and effect of antioxidant on the oxidation stability; Biodiesel metilico de Dipteryx lacunifera: preparacao, caracterizacao e efeito de antioxidantes na estabilidade a oxidacao

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Francisca Diana da Silva; Moura, Carla Veronica Rodarte de; Chaves, Mariana H., E-mail: mariana@ufpi.edu.b [Universidade Federal do Piaui (UFPI), Teresina, PI (Brazil). Dept. de Quimica

    2010-07-01

    The objective of this work was to study the potentialities of Dipteryx lacunifera Ducke seeds oil for biodiesel production. The yield in oil was of 46.11 {+-} 0.37%. Methyl biodiesel was prepared by base catalyzed transesterification yielding 88.13% and percentage conversion of triglycerides to corresponding methyl ester of 89.1%. The addition of the tertiary butylhydroquinone (TBHQ, 50 ppm), butylated hydroxytoluene (BHT, 50 ppm) and cashew nut shell liquid (CNSL, 2000 ppm) antioxidants in the biodiesel contributed to the increase of the induction period of 2.97 h for 8.08; 6.06 and 6.02 h, respectively. (author)

  2. Influência da acidez na síntese do MTBE sobre zeólitas Beta modificadas

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    Adriano Morales Gonzales

    2001-05-01

    Full Text Available No presente trabalho, estudou-se a reação de síntese do MTBE sobre zeólitas Beta desaluminizadas e lixiviadas. A desaluminização hidrotérmica e térmica da zeólita HBeta levou a catalisadores menos ativos devido à diminuição do concentração total de sítios ácidos de Brönsted. Além disso, verificou-se que a eliminação das espécies de alumínio extra-rede na amostra HBeta por tratamento ácido levou a uma diminuição na atividade catalítica da zeólita, mesmo esta apresentando uma maior concentração de sítios ácidos de Brönsted. Isto sugere que espécies de alumínio extra-rede catiônicas altamente dispersas interagem com as hidroxilas da rede zeolítica, gerando sítios de Brönsted com atividade catalítica aumentada. Deste modo, a zeólita HBeta apresentou rendimento máximo em MTBE a 70oC, sendo este superior ao mostrado pelo catalisador comercial (resina Amberlyst 15 e pelas demais zeólitas estudadas, nas condições de reação utilizadas

  3. Study of the effect of ionizing radiation for utilization of spent cracking catalysts; Estudo do efeito da radiacao ionizante na utilizacao dos catalisadores desativados de craqueamento

    Energy Technology Data Exchange (ETDEWEB)

    Kondo, Fernando Mantovani

    2014-07-01

    Catalyst is a substance that changes the rate of a reaction. In the petroleum industry the commonly catalysts are used for Fluid Catalytic Cracking (FCC) and Hydrocatalytic Cracking (HCC), which one applied in a specific stage. These catalysts are used to facilitate the molecular chains cracking which will generate a mixture of hydrocarbons. However, the catalyst gradually loses its activity, either by changing its original molecular structure or by its contamination from other petroleum molecules. The application of ionizing radiation (electron beam and gamma rays) over these spent catalysts was studied to contribute with the extraction of metals or rare-earths of high added-value. Tests carried out with FCC catalysts were used the techniques of {sup 60}Co irradiation and electron beam (EB) and had as a subject the extraction of lanthanum (La{sub 2}O{sub 3}), regeneration and utilization of these catalysts. However, the use of ionizing radiation has not contributed in these processes. Meanwhile with HCC catalysts the irradiation used was electron beam and had as a subject the extraction of molybdenum (MoO{sub 3}). In temperature around 750°C, these irradiated catalysts of the lower region have an extraction yield twice higher compared to non-irradiated ones, in other words 57.65% and 26.24% respectively. (author)

  4. New fillers in the synthesis of polypropylene nano composites with Ziegler-Natta catalysts; Novas cargas na sintese de nanocompositos de polipropileno com catalisadores Ziegler-Natta

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    In this study, Ziegler-Natta catalysts bi-supported on MgCl{sub 2} and natural clays were prepared in order to synthesize polypropylene nanocomposites. The employed clays were bentonite, as reference, as well as halloysite, vermiculite and mica. Propylene polymerizations were carried out using those catalysts and the properties of the obtained materials were analyzed using techniques of thermogravimetric analysis X-ray diffraction, dynamic mechanical thermal analysis e scanning electronic microscopy. Results showed the production of nanocomposites with higher thermal degradation temperature. (author)

  5. Recuperação de metais de catalisadores mássicos e monometálicos

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    Afonso Júlio Carlos

    2003-01-01

    Full Text Available This work presents a study on the dissolution of some commercial monometallic and non-supported deactivated catalysts in HF + H2O2 mixtures (and, eventually, other media under mild experimental conditions, after a previous oxidation step. The samples were neither crushed nor grinded. The best experimental conditions were dependent on the nature of the support and of the active phase. For example, the Pt/Al2O3 catalyst was dissolved in about 10 minutes, without agitation and heating; however, dissolution of the Pd/Al2O3, Ni/Al2O3, Ni/SiO2, Cu/Al2O3 and V2O5 samples required a temperature of 60 ºC and an agitation of 400 rpm. A careful addition of a NaOH solution allowed a quantitative precipitation of aluminium as criolite (Na3AlF6 or precipitation of Si as Na2SiF6; NaF was obtained as a by-product. As expected, processing of Pd/C, V2O5 and CuO.Cr2O3 samples was relatively simple. Metals recovery from catalysts reached a quantitative level in all samples studied; it is particularly interesting that platinum and palladium could be easily recovered in a single step process, thus separing them from aluminium.

  6. Development of refractory ceramic using waste of petrochemical catalysts; Desenvolvimento de ceramica refrataria utilizando residuos de catalisadores petroquimicos

    Energy Technology Data Exchange (ETDEWEB)

    Pedroso, M.A.; Mymrine, V. [Universidade Federal do Parana (UFPR), PR (Brazil)

    2011-07-01

    The manufacturing of catalytic catalysts by the company FCC SA. for the Brazilian petrochemical industry is 25,000 tons per annum, which after going through the cracking process cannot undergo regeneration any longer, being wasted with humidity near 70%. To increase the economical and environmental efficiency of the use of this rejected catalyst, without preliminary drying, a method of using it as main raw material in composition like kaolin was developed, as well as in ash and glass for the manufacturing of common (regular) and refractory ceramic. The mixture of these components were burnt at temperatures of 1100 deg C, 1200°C, 1250°C and 1300°C. The ceramics with 30% and 40% in weight of wasted catalyst, sintered in 1250 deg C or 1300 deg C have flexion of 10,8 - 12,9 MPa. After burning the mixtures, the chemical interaction of the initial components was determined by the methods of RXD, MEV and EDS, synthesizing new minerals like Diopside Ca(Mg,Al)(Si,Al){sub 2}O{sub 6}, Nepheline (K,Na)AlSiO{sub 4}, Lazurite Na{sub 8}[Al{sub 2}SiO{sub 4}]{sub 6}[SO{sub 4},S]{sub 2}, Magnetite Fe{sub 3}O{sub 4}, Albite Na Al Si{sub 3}O{sub 8} and high content of vitreous amorphous phase. (author)

  7. Preparação de catalisadores óxidos metálicos de Sb-V-O. Estudo cinético da desidrogenação oxidativa do propano

    OpenAIRE

    Beato, Luis Francisco T. F. dos Santos

    2013-01-01

    Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica O trabalho experimental com o título “Preparação de catalisadores óxidos metálicos de Sb-V-O. Estudo cinético da desidrogenação oxidativa do propano.” foi realizado no âmbito da tese de mestrado em engenharia química e bioquímica da Faculdade de Ciências e Tecnologia da UNL, com parceria com o Departamento de Ingeniería Química da Universidad de Málaga. O principal objectivo do presente trabalho centra-se ...

  8. Enzimas na alimentação de suínos Enzymes in feeds for swine

    Directory of Open Access Journals (Sweden)

    Francisco Antonio Tenorio Fireman

    1998-03-01

    Full Text Available Enzimas são proteínas globulares de estrutura terciária ou quaternária que agem como catalisadores bilógicos e estão envolvidas em todos os processos do metabolismo animal. As enzimas comercialmente produzidas são provenientes, geralmente, de bactérias do gênero Bacillus sp ou fungos do gênero Aspergillus sp. Os efeitos benéficos de sua utilização na alimentação de suínos têm sido observados por pesquisadores de todo o mundo. Este artigo objetiva abordar os efeitos do uso de enzimas em vários aspectos da nutrição de suínos.Enzymes are globular proteins of tertiary or quaternary structure that act like biologic catalyzers and are involved in all ways in animal metabolism. The enzymes on the market are generally originated from bacteria like Bacillus sp or by fungi like Aspergillus sp. The beneficial effects of their utilization have been observed through research around the world. The objective of this review is the discussion of several aspects of enzymes utilization in swine nutrition.

  9. Synthesis and characterization of ZSM-12 type zeolytic catalysts by using different aluminium sources in the petroleum industry; Sintese e caracterizacao de catalisadores zeoliticos do tipo ZSM-12 utilizando diferentes fontes de aluminio na industria do petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Moraes, Marilia R.F.S.; Jesus, Daniela B.; Souza, Marcelo J.B. [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Dept. de Engenharia Quimica; Santos, Consuelo D.; Machado, Sanny W.M.; Pedrosa, Anne M. Garrido [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Dept. de Quimica

    2010-12-15

    The main objective was to synthesize and characterize ZSM-12 zeolites from different sources of aluminium, using hydrothermal method and characterize the catalysts synthesized by X-ray diffractions, thermal analysis and infrared absorption spectroscopy. The X-ray diffractogram showed the formation of zeolites of the family pantasil crystalline. Thermogravimetric curves and FTIR spectra were utilized by monitoring the removal of template and by monitoring the maintenance of zeolite structure. (author)

  10. Análise por componentes principais de espectros nexafs na especiação do molibdênio em catalisadores de hidrotratamento Principal component analysis of nexafs spectra for molybdenum speciation in hydrotreating catalysts

    Directory of Open Access Journals (Sweden)

    Arnaldo da C. Faro Jr

    2010-01-01

    Full Text Available Bulk and supported molybdenum based catalysts, modified by nickel, phosphorous or tungsten were studied by NEXAFS spectroscopy at the Mo L III and L II edges. The techniques of principal component analysis (PCA together with a linear combination analysis (LCA allowed the detection and quantification of molybdenum atoms in two different coordination states in the oxide form of the catalysts, namely tetrahedral and octahedral coordination.

  11. O efeito da desativação térmica nas propriedades oxirredutoras e na atividade catalítica de catalisadores CZ e Pd-CZ

    Directory of Open Access Journals (Sweden)

    Daniela Cruz Damasceno da Silva

    2012-01-01

    Full Text Available Automotive catalyst, using in Brazil since 1992, is a essential technology for vehicular emissions control. Noble metals are the active phase of these catalysts, and cerium zirconium mixed oxides (CZ, responsibles for the oxygen storage capacity (OSC, one of the most important aspect for the operational performance of the catalyst. In this context, the oxireduction properties analysis of CZ and Pd/CZ (palladium supported in CZ system are the objective of this study, as well as, the impact of the thermal aging in the OSC. Aging consisted of treatments at 900 or 1200 °C, for 12 or 36 h, in oxidizing condition.

  12. Co2 na desidrogenação oxidativa do etilbenzeno utilizando catalisadores compostos de óxido de ferro e óxido de alumínio

    Directory of Open Access Journals (Sweden)

    Tiago Pinheiro Braga

    2011-01-01

    Full Text Available Materials containing aluminum and iron oxide were synthesized through the preparation of hybrid spheres and tested in the dehydrogenation of ethylbenzene in the presence of CO2. The catalytic results suggest that the high initial ethylbenzene conversion is due to the contribution of basic sites. These results also point to a competitive process between CO2 adsorption and the oxidative dehydrogenation of ethylbenzene for the basic sites (lattice oxygen. In spite of the coke deposition is originating from ethylbenzene and CO2, the amount of carbonaceous deposits was smaller with the presence of CO2, if compared with the dehydrogenation in the absence of CO2.

  13. Efeito da adição de lantânio em catalisadores de Ni/ZrO2 aplicados na reação de reforma a vapor de etanol

    Directory of Open Access Journals (Sweden)

    Luciene Paula Roberto Profeti

    2012-01-01

    Full Text Available The catalytic performance of Ni/ZrO2 catalysts loaded with different lanthanum content for steam reforming of ethanol was investigated. Catalysts were characterized by BET surface area, X-ray diffraction, UV-vis spectroscopy, temperature programmed reduction, and X-ray absorption fine structure techniques. Results showed that lanthanum addition led to an increase in the degree of reduction of both NiO and nickel surface species interacting with the support, due to the higher dispersion effect. The best catalytic performance at 450 ºC was found for the Ni/12LZ catalyst, which exhibited an effluent gaseous mixture with the highest H2 yield.

  14. Thermal aging effect in oxi-reduction properties and catalytic activity of CZ and Pd-CZ catalyst; O efeito da desativacao termica nas propriedades oxirredutoras e na atividade catalitica de catalisadores CZ e Pd-CZ

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Daniela Cruz Damasceno da; Zotin, Fatima Maria Zanon, E-mail: fmzzotin@gmail.com [Departamento de Operacoes e Projetos Industriais, Instituto de Quimica, Universidade do Estado do Rio de Janeiro, RJ (Brazil); Neumann, Reiner [Coordenacao de Analises Minerais, Centro de Tecnologia Mineral, Rio de Janeiro, RJ (Brazil); Hori, Carla Eponina [Faculdade de Engenharia Quimica, Universidade Federal de Uberlandia, MG (Brazil); Cardoso, Mauri Jose Baldini [Centro de Pesquisas e Desenvolvimento Leopoldo Americo Miguez de Melo - PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2012-07-01

    Automotive catalyst, using in Brazil since 1992, is a essential technology for vehicular emissions control. Noble metals are the active phase of these catalysts, and cerium zirconium mixed oxides (CZ), responsible for the oxygen storage capacity (OSC), one of the most important aspect for the operational performance of the catalyst. In this context, the oxireduction properties analysis of CZ and Pd/CZ (palladium supported in CZ) system are the objective of this study, as well as, the impact of the thermal aging in the OSC. Aging consisted of treatments at 900 or 1200 degree C, for 12 or 36 h, in oxidizing condition. (author)

  15. Effects of adding lanthanum to Ni/ZrO{sub 2} catalysts on ethanol steam reforming; Efeito da adicao de lantanio em catalisadores de Ni/ZrO{sub 2} aplicados na reacao de reforma a vapor de etanol

    Energy Technology Data Exchange (ETDEWEB)

    Profeti, Luciene Paula Roberto [Centro de Ciencias Agrarias, Universidade Federal do Espirito Santo, Alegre, ES (Brazil); Habitzheuter, Filipe; Assaf, Elisabete Moreira, E-mail: eassaf@iqsc.usp.br [Instituto de Quimica de Sao Carlos, Universidade de Sao Paulo, Sao Carlos, SP (Brazil)

    2012-07-01

    The catalytic performance of Ni/ZrO{sub 2} catalysts loaded with different lanthanum content for steam reforming of ethanol was investigated. Catalysts were characterized by BET surface area, X-ray diffraction, UV-vis spectroscopy, temperature programmed reduction, and X-ray absorption fine structure techniques. Results showed that lanthanum addition led to an increase in the degree of reduction of both NiO and nickel surface species interacting with the support, due to the higher dispersion effect. The best catalytic performance at 450 deg C was found for the Ni/12LZ catalyst, which exhibited an effluent gaseous mixture with the highest H{sub 2} yield. (author)

  16. Preparação da Liga Amorfa Co72Nb24B4 como Catalisador na Reação de Oxidação do Metanol

    Directory of Open Access Journals (Sweden)

    Luciano Nascimento

    2015-12-01

    Full Text Available This study aims to investigate and characterize the amorphous alloy Co72Nb24B4 the catalytic oxidation of methanol in products that serve as primary reagents for organic synthesis, such as formaldehyde and other intermediate products. The technique for obtaining the amorphous alloy was electric arc smelting furnace. The amorphous alloy catalyst Co72Nb24B4 was characterized by XRD, SEM / EDS, BET and thermal analysis TGA and DTA. The objective of this work is to develop and study the application of amorphous alloy as catalysts and catalyst supports, due to its thick this oxide layer on its surface capable of oxidizing methanol and intermediates of methanol oxidation reaction. The amorphous alloy structure Co72Nb24B4 is still stable after the catalytic test, since the formation of intermetallic and amorphous phases are rich in active sites that are important for the catalytic processes at the surface of these amorphous materials. DOI: http://dx.doi.org/10.17807/orbital.v7i4.768

  17. Study of (Fe/HZM-5) catalyst be used in the Fischer-Tropsch synthesis: preparation and characterization; Estudo do catalisador (Fe/HZSM-5) a ser utilizado na sintese de Fischer-Tropsch: preparacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Gonzaga, Arthur C. [Universidade Estadual do Maranhao (UEMA0), MA (Brazil); Sousa, Bianca V. de; Lima, Wellington S.; Rodrigues, Meiry G.F. [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia Quimica

    2008-07-01

    In this work it was developed an iron catalyst supported on the ZSM-5 zeolite to be used in the Fischer-Tropsch Synthesis (FTS). The NH{sub 4}{sup +}ZSM-5 zeolitic support was submitted to the wet impregnation, using the 0.1 M of the Fe(NO{sub 3}){sub 3}.9H{sub 2}O solution to obtain the Fe/NH{sub 4}{sup +}ZSM-5 sample in the content of iron 5% wt. After, the material was submitted for the drying process and in the following, for the calcination one, obtaining the Fe/HZSM-5 form. The EDS characterization analyses showed that in the Fe/HZSM-5 sample the iron is in the Fe{sub 2}O{sub 3} form and that the impregnation and calcination processes did not cause significant exchanges in the zeolitic support framework. The results of the N{sub 2} physical adsorption of the 5% Fe/HZSM-5 showed the presence of the micropores and mesopores. From these results, the obtained material (5% Fe/HZSM-5) presents a great potential to be used like a catalyst in the FTS. (author)

  18. Preparation of Pt/USY catalysers and application in the reformation of n-octane; Preparacao de catalisadores Pt/USY e aplicacao na reforma do n-octano

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Alfredina dos S.; Sousa, Bianca V.; Grau, Javier M.; Rodrigues, Meiry Glaucia F. [Universidade Federal de Campina Grande (UFCG), PB (Brazil)

    2008-07-01

    During the catalytic reform, the hydrocarbons of long chain are reconstructed, through reactions of isomerization, hydrogenation, desidrocyclization and dehydrogenation, among others. These reactions occur in acid or metallic small farms, on a bifunctional catalyzer of type Pt/Al{sub 2}O{sub 3}-Cl. The metallic component is active in the hydrogenation and dehydrogenation, while the support (chlorinated alumine) possess acidity enough to promote isomerization reactions. The joint action of the two small farms promotes other reactions, as the desidrocyclization, through a bifunctional mechanism. Reactions also occur undesirable (hydrocracking and hydrogenation) that they diminish the selectivity and they deactivate the catalyzer for coke formation. The catalyzers most promising for this reaction are the acid zeolites of great pores, had to its textural characteristics that facilitate the access of the reagents to active small farms. In this work, the catalytic performance of the metallic function in the dehydrogenation reaction, the conversion and income in the reaction of reform of n-octane will be studied, of the catalyzers of the Pt/USY type. (author)

  19. UTILIZANDO NANOTUBOS DE TiO2 COMO FOTOCATALISADOR NA DEGRADAÇÃO DO CORANTE VERMELHO CONGO

    OpenAIRE

    Nilmalice Coelho Rocha; Leonardo Lopes da Costa

    2011-01-01

    Nanotubos de TiO2 foram sintetizados em um sistema hidrotérmico. Os nanomateriais foram caracterizados por microscopia eletrônica de varredura (MEV) e área superficial. O TiO2 anatase e os nanotubos de TiO2 foram utilizados no processo de fotodegradação do corante vermelho congo. A capacidade de fotodegradação de ambos catalisadores foram comparadas. O corante foi degradado por 90 minutos, utilizando ambos catalisadores, estes apresentaram alta atividade catalítica próximo ao pH 2. A capacid...

  20. DISKRIMINACIJA NA TRGU DELA NA PODLAGI SPOLA

    OpenAIRE

    Prnaver, Polona

    2012-01-01

    Boj proti diskriminaciji je danes velik izziv za države, katerih temelji slonijo na načelih svobode, demokracije in spoštovanja človekovih pravic. Zato morajo v svoj sistem sprejeti vse potrebne ukrepe za boj proti vsem oblikam diskriminacije, predvsem kadar te zadevajo zaposlitev in trg dela. Vendar je problem uravnoteženega zastopanja obeh spolov na trgu dela še vedno zelo prisoten. Diskriminacija glede na spola na trgu dela predstavlja celostno zakonsko urejeno področje, ki se navezuje ...

  1. Aproveitamento do Óleo das Amêndoas de Tucumã do Amazonas na Produção de Biodiesel The use of tucumã of amazonas kernel oil in the biodiesel production

    Directory of Open Access Journals (Sweden)

    Banny Silva Barbosa

    2009-01-01

    Full Text Available A falta de disponibilidade de energia elétrica é um dos principais motivos pelo baixo Índice de Desenvolvimento Humano das comunidades isoladas localizadas na Amazônia. O biodiesel produzido a partir de óleos vegetais extraídos de espécies oleaginosas nativas de forma sustentada é uma das melhores alternativas energéticas para a região. O tucumã do amazonas, Astrocaryum aculeatum, é uma espécie de palmeira que produz um fruto muito apreciado na região, a partir do qual se obtém uma amêndoa com alto teor de óleo. Nesse estudo, foi avaliada a produção de biodiesel etílico, a partir de diferentes lotes de óleos de tucumã do amazonas, com índices de acidez baixos e elevados, pela transesterificação por catálise básica e ácida homogêneas, respectivamente. Na catálise ácida, foram testados HCl e H2SO4 como catalisadores nas concentrações de 0,0625 a 1,000 M, empregando etanol hidratado na proporção molar de 1:6 e a reação conduzida a 90 ºC por 24 h. Na catálise básica, foram testados NaOH e KOH, nas proporções de 0,5 a 2,0 %, empregando etanol anidro na proporção molar de 1:12 e a reação conduzida a 80 ºC por 2 h. O biodiesel obtido em cada experimento foi analisado por métodos físicos (massa específica e cromatográficos (CLAE em fase reversa. Análises cromatográficas indicaram que as melhores conversões foram alcançadas por amostras de biodiesel com massas específicas inferiores a 0,87 g.cm-1. As amostras de biodiesel obtidas com melhor qualidade foram obtidas utilizando-se os catalisadores ácidos a 1,0 M com rendimentos superiores a 90%. No caso da catálise básica, obteve-se biodiesel de boa qualidade empregando-se o catalisador NaOH a 2,0%, porém com rendimento inferior a 60 %. Contudo, em ambos os casos, foi possível identificar um excelente potencial de produção de biocombustível, a partir do óleo das amêndoas de tucumã.The shortage of electricity is a major reason for the low

  2. The NA49 experiment

    CERN Document Server

    Patrice Loiez

    2000-01-01

    The two spokespersons of NA49, Reinhard Stock, Frankfurt (1991-1996), sitting and standing, Peter Seyboth, (1997-present), MPI Munich, in the target area of NA49 in front of the first superconducting vertex magnetone of the TPCs. NA49 is one of the seven experiments (NA44, NA45, NA49, NA50, NA52, WA97/NA57 and WA98) involved in CERN's Heavy Ion programme which provided evidence for the existence of a new state of matte, the quark-gluon plasma. In this state, quarks, instead of being bound up into more complex particles such as protons and neutrons, are liberated and roam freely. Theory predicts that this state must have existed at about 10 microseconds after the Big Bang, before the formation of matter as we know it today.

  3. MOBING NA DELOVNEM MESTU

    OpenAIRE

    Grunt, Maja

    2016-01-01

    Diplomsko delo se osredotoča na probleme mobinga na delovnem mestu in morebitne rešitve. Razdeljeno je na teoretični in empirični del. V teoretičnem delu smo opredelili pojem mobing na delovnem mestu, kot ga razlagajo različni avtorji, oblike mobinga, ki kažejo na to, da se v podjetjih mobing pojavlja na različne načine in v vseh smereh, vzroke za njegovo nastajanje, ki se kažejo v kulturi organizacije, značilnostih organizacije dela, značilnostih žrtev mobinga in značilnostih napadalcev. Pr...

  4. Influence of method of preparation of Pt Ru/C electrocatalysts on the catalytic activity for the ethanol oxidation reaction in acidic medium; Influencia do metodo de preparacao de eletrocatalisadores PtRu/C sobre a atividade catalitica frente a reacao de oxidacao de etanol em meio acido

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Walber dos Santos; Silva, Uriel Lean Valente; Souza, Jose Pio Iudice de, E-mail: jpio@ufpa.br [Universidade Federal do Para, (UFPA), Belem, PA (Brazil). Instituto de Ciencias Exatas e Naturais. Faculdade de Quimica

    2013-09-01

    In this work the influence of variations in the borohydrate reduction method on the properties of Pt Ru/C electrocatalysts was investigated. The electrocatalysts were prepared using 1:1 ; 2:1; 5:1; 50:1 and 250:1 molar ratios of NaBH{sub 4} to metals. The reduction was also performed by dripping or by fast addition of the solution. The results showed that Pt Ru nanoparticles obtained by fast addition had the smallest crystallite sizes. It was also noted that the catalytic activity increased as the borohydrate:metal molar ratio increased. The Pt Ru/C electrocatalysts (50:1) obtained by fast addition presented the best catalytic activity for ethanol electro-oxidation. (author)

  5. Emprego de subprodutos da produção de piches de petróleo na síntese de nanoesferas de carbono Use of byproducts of petroleum pitch production as precursors for synthesis of carbon nanospheres

    Directory of Open Access Journals (Sweden)

    Alexandre T. de Castro

    2009-01-01

    Full Text Available Nanoesferas de carbono foram produzidas a partir de resíduos de petróleo, obtidos da produção de piches pela destilação de óleos decantados, pela técnica de deposição química de vapor a 1200 °C, sem catalisadores, em um processo contínuo. Três resíduos foram selecionados de forma a representar a faixa de propriedades tipicamente encontradas para este material. Nitrogênio e argônio foram empregados como gases de arraste. As nanoesferas obtidas apresentaram propriedades semelhantes para os três resíduos diferentes, sendo a influência do precursor menos significativa que a do gás de arraste empregado. Os rendimentos obtidos, na faixa de 40-50%, e a baixa sensibilidade do processo à composição do precursor indicam que o processo é adequado à utilização industrial.Carbon nanospheres were produced from petroleum residues obtained in the production of petroleum pitches by distillation of decant oils, using chemical vapor deposition at 1200 °C, without catalysts and in a continuous process. Three residues were selected to represent the typical variability in the properties of this material. Nitrogen and argon were used as carrier gases. The three residues yielded nanospheres of similar properties, which were more influenced by the nature of the carrier gas. The mass yields of 40-50% and the low dependence on precursor composition indicate that the process is suitable for large scale industrial use.

  6. Estudo da oxidação do limoneno utilizando catalisadores metaloporfirínicos com variação do sistema solvente/oxidante - DOI: 10.4025/actascitechnol.v26i1.1533

    Directory of Open Access Journals (Sweden)

    Mara Heloisa Neves Olsen

    2004-03-01

    Full Text Available Complexos tetrafenilporfirínicos de ferro, manganês e cobalto foram sintetizados, caracterizados e utilizados na oxidação do R-limoneno empregando-se diferentes solventes e doadores de oxigênio. Foram utilizados três solventes (acetato de etila, acetonitrila e diclorometano e dois agentes doadores de oxigênio (hidroperóxido de terc-butila e hipoclorito de sódio de acordo com planejamento de experimentos. Os sistemas propostos apresentaram altos valores para a conversão do limoneno com baixa seletividade a carvona/epóxidos. A conversão se mostrou fortemente dependente do agente oxidante utilizado e pouco influenciada pelo complexo metálico e solvente

  7. Rede social de leitores e escritores juniores: portal Biblon: a integração social on-line como catalisador da leitura, criação, expressão e partilha

    OpenAIRE

    Furtado, Cassia Cordeiro

    2013-01-01

    Com enquadramento nas áreas de Ciência da Informação, Tecnologias de Informação e Comunicação e Educação, o estudo em voga visa formular propostas para o uso de rede social on-line de literatura infantil, em torno da biblioteca, para a educação básica, fundamentadas na teoria de comunidades de prática. O estudo de caso recaiu sobre quatro escolas, do 1º ciclo, da Educação Básica, do Agrupamento de Escolas de Aveiro-Portugal, tendo como instrumento para o experimento o Por...

  8. Envolvimento Parental na Escola

    OpenAIRE

    Alves, Marta Raquel Garcia; Rolim, Luísa

    2011-01-01

    O nosso estudo teve como objectivo verificar se existe envolvimento parental na Escola Básica Integrada com Jardim de Infância de Góis. Nesta análise foram questionados alguns alunos dos 7º e 9º anos, encarregados de educação e docentes dos referidos alunos. A nossa amostra contou com a participação de 115 indivíduos sendo 67 alunos 31 encarregados de educação e 17 docentes. Na recolha dos dados usamos o Questionário de Envolvimento Parental na Escola de Pereira (2002), com Versão para pais e...

  9. FOTOALERGIJSKE REAKCIJE NA LIJEKOVE

    OpenAIRE

    Bukvić Mokos, Zrinka; Lipozenčić, Jasna

    2011-01-01

    Reakcije na lijekove posredovane svjetlom mogu biti fototoksične i fotoalergijske. U ovom preglednom članku prikazane su fotoalergijske reakcije na lijekove koje nastaju interakcijom lijeka i ultraljubičastog svjetla uz sudjelovanje imunosnih mehanizama. Uz osvrt na fotobiologiju te najčešće lijekove koji sudjeluju u nastanku fotoalergijskih reakcija, prikazana je imunološkapodloga tih dermatoza, klinička slika, te dijagnostički i terapijski postupak. Poznavanje potencijalnih fotoalergena i p...

  10. EROTIČNA RISBA

    OpenAIRE

    LAZAR, FORTUNA

    2009-01-01

    Diplomsko delo z naslovom »Erotična risba« je sestavljeno iz teoretičnega in praktičnega dela, pri čemer je praktični del vsebinsko vezan na teoretični del diplomske naloge. Neposredna erotična upodobitev je del likovne produkcije večine umetnikov. V raziskovanju erotičnih upodobitev sem izpostavila dva umetnika, Egona Schieleja, ki je ustvaril pomemben opus erotične figuralike in Marlene Dumas, še živečo umetnico, ki skozi erotične podobe izraža aktualne teme sodobnosti. Namen tega diplomske...

  11. Djelovanje eksplozija na konstrukcije

    OpenAIRE

    Draganić, Hrvoje; Sigmund, Vladimir

    2012-01-01

    Dana je analiza opterećenja eksplozijom na konstrukciju te numerički primjer djelovanja na fiktivnu građevinu. Cilj je bio upoznati se s fenomenom eksplozije kao opterećenja na konstrukcije uslijed sve veće terorističke prijetnje te nedostatka smjernica u nacionalnim i europskim propisima o provjeri konstrukcija izloženih djelovanju eksplozija. Analitički je određeno opterećenje eksplozijom kao vremenski zapis promjene tlaka zraka te numerički modeliranja konstrukcija i prethodno određeno opt...

  12. At NA2

    CERN Multimedia

    1977-01-01

    One of the NA2 calorimeter sections is moved in. The NA2 calorimeter was divided in two halves, to the left and the right of the beam, each half consisting of sheets of passive high Z material interleaved with blades of plastic scintillators. The photo shows on the right, the upstream 'electron' module with eleven lead plates for a total radiation length of 20.

  13. Y-virus krumpira na duhanu na Kosovu

    OpenAIRE

    Taraku, Nysret; Juretić, Nikola

    1991-01-01

    U prošlih nekoliko godina javlja se na duhanu na području Kosova vrlo agresivna virusna bolest zbog koje nastaju znatne gospodarske štete. Na oboljelim biljkama virus uzrokuje nekrotične promjene na listu, osobito nekroze žila, te mozaik. U ovom su radu istražena 4 virusna izolata (TI, T2, T3, T4) nađena na duhanu u okolici Gnjilana, Uroševca, Đakovice i Prizrena. Na osnovi istraživanja kruga domaćina, osobina in vitro, seroloških svojstava te studija mikroskopskih i submikroskopskih inkluzij...

  14. Comportamento eletroquímico da cisteína e do difosfonato para o aço inoxidável 304 em HCl 1 mol L-1 Electrochemical behavior of the cistein and diphosfonate for stainless steel in media of HCl 1 mol L-1

    Directory of Open Access Journals (Sweden)

    Aline Viomar

    2010-03-01

    Full Text Available Aminoácidos e moléculas auto-organizáveis vêm sendo largamente estudados na ação inibidora da corrosão de materiais metálicos. Esse trabalho tem como objetivo estudar o comportamento eletroquímico da cisteína, do difosfonato e da mistura de ambos na ação inibidora da corrosão do aço inoxidável 304 em HCl 1M. Foram empregadas como técnicas: potencial de circuito aberto, polarização anódica potenciostática (PA, cronoamperometria (CA, espectroscopia de impedância eletroquímica (EIE e microscopia óptica (MO. Os resultados de CA mostraram que a cisteína tem um efeito dúbio, catalisador e inibidor de corrosão, efeito este em função do tempo de imersão da peça metálica na solução eletrolítica. As curvas PA mostraram menor densidade de corrente para o sistema contendo cisteína + difosfonato, sugerindo uma ação sinérgica inibidora. Esses resultados foram confirmados por EIE e MO.Amino acids and self assembled monolayers (SAM's have been studied as to their inhibiting action on the corrosion of metallic materials. The objective of this work is to study the electrochemical behavior of the cisteincisteine, the diphosfonate and the mixture of both in inhibiting the action of corrosion on stainless steel 304 in HCl 1 molL-1. As the following techniques were used: open circuit potential (OCP, potenciostatic anodic polarization (AP, chronoamperometry (CA, electrochemical impedance spectroscopy (EIS and optical microscopy (OM. The results of CA showed that cisteine has a double effect, catalytic and inhibiting, in function of the immersion time of the metallic part in the electrolytic solution. AP curves have shown lesser current density for the system containing cisteine + diphosfonate, suggesting an inhibiting synergic action. These results have been confirmed by EIS and OM.

  15. Monitoring of mass flux of catalyst FCC in a Cold Pilot Unit by gamma radiation transmission; Monitoramento da taxa de fluxo do catalisador FCC em uma unidade piloto a frio por medicao de transmissao gama

    Energy Technology Data Exchange (ETDEWEB)

    Brito, Marcio Fernando Paixao de

    2014-09-01

    This paper proposes a model for monitoring the mass flow of catalyst FCC - Fluid Catalytic Cracking - in a CPU - Cold Pilot unit - due to the injection of air and solid by gamma radiation transmission. The CPU simplifies the process of FCC, which is represented by the catalyst cycle, and it was constructed of acrylic, so that the flow can be visualized. The CPU consists of riser separation chamber and return column, and simulates the riser reactor of the FCC process. The catalyst is injected into the column back to the base of the riser, an inclined tube, where the compressed air means that there fluidization along the riser. When the catalyst comes in the separation chamber, the solid phase is sent to the return column, and the gas phase exits the system through one of the four cyclones at the top of the separation chamber. The transmission gamma of measures will be made by means of three test sections that have source and detector shielded. Pressure drop in the riser measurements are made through three pressure gauges positioned on the riser. The source used was Am-241 gamma ray with energy of 60 keV, and detector used was a scintillator of NaI (Tl) of 2 {sup x} 2{sup .} Measures the mass flow of catalyst are made by varying the seal of the catalyst, and density of solid in the riser because with the combination of these measures can determine the speed of the catalyst in the riser. The results show that the transmission gamma is a suitable technique for monitoring the flow of catalyst, flow model in CPU is annular, tomography third generation is more appropriate to study the CPU and the density variation in circulation in the CPU decreases linearly with increasing air flow. (author)

  16. Modelagem do Processo de Fragmentação de Catalisadores Suportados Durante a Pré-polimerização de Olefinas Modeling of Catalyst Fragmentation During Olefin Pre-polymerizations

    Directory of Open Access Journals (Sweden)

    Douglas M. Merquior

    2002-01-01

    Full Text Available Uma metodologia é proposta para descrever a morfologia das partículas de polímero que são obtidas durante os momentos iniciais da polimerização de olefinas via catálise heterogênea. O método é baseado na análise matemática da capacidade da partícula em liberar a energia mecânica acumulada no seu interior devido à rápida produção de polímero. O balanço entre as quantidades de energia acumulada e liberada é calculado com o auxílio de um modelo dinâmico da reação de pré-polimerização. A combinação da metodologia proposta com o modelo dinâmico permitiu a análise dos mecanismos de fragmentação, indicando a morfologia da partícula de polímero produzida em função do tamanho da partícula e da temperatura do reator.A model-based methodology is proposed for describing the morphology of the polymer particles that are obtained during the very early stages of the olefin polymerization. The method is based on the analysis of the particle capacity to release the amount of energy that is accumulated in its interior during the polymerization, due to the fast polymer production. The balance between the accumulated and released amounts of energy is calculated with the help of a dynamic pre-polymerization reaction model. The combination of the fragmentation criteria and of the polymerization model allows the analysis of the prepolymerization step, indicating the morphology of the final polymer particles as a function of the catalyst particle diameter and reactor temperature.

  17. MOBING NA DELOVNEM MESTU

    OpenAIRE

    Mraz, Darja

    2011-01-01

    Mobing pomeni načrtno psihično nasilje,trpinčenje in šikaniranje,ki žrtev privede do socialne izolacije.Proces mobinga poteka skozi štiri faze.Začne se s konfliktom in nadaljuje z uveljavitvijo mobinga v obliki stalnih napadov,vse skupaj pa se lahko konča z izključitvijo iz delovnega življenja.Ključni dejavniki mobinga so stres pri delu,način vodenja ter slabo vzdušje med zaposlenimi in vodstvom.

  18. Effect study of the support in nickel and cobalt catalysts for obtaining hydrogen from ethanol steam reforming; Estudo do efeito do suporte em catalisadores de cobalto e niquel para obtencao de hidrogenio a partir da reforma a vapor do etanol

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Sirlane Gomes da

    2013-09-01

    A range of oxide-supported metal catalysts have been investigated for the steam reforming of ethanol for the production of hydrogen and subsequent application in fuel cells. The catalysts were synthesized by the co-precipitation and internal gelification methods using cobalt and nickel as active metals supported on aluminum, zirconium, lanthanum and cerium oxides. After prepared and calcined at 550 C Masculine-Ordinal-Indicator the solids were fully characterized by different techniques such as X-rays diffraction(DRX), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy, nitrogen adsorption (B.E.T), temperature-programmed reduction in H2 (TPR-H2) and thermogravimetric analysis. The catalytic tests were performed in a monolithic quartz reactor and submitted to different thermodynamic conditions of steam reforming of ethanol at temperatures varying from 500 Masculine-Ordinal-Indicator C to 800 Masculine-Ordinal-Indicator C. The product gas streams from the reactor were analyzed by an on-line gas chromatograph. The cobalt/nickel catalyst supported on a ceria-lanthania mixture (Co{sub 10%} / Ni{sub 5%} - CeO{sub 2}La{sub 2}O{sub 3}) showed good catalytic performance in hydrogen selectivity reaching a concentration greater than 65%, when compared to other catalytic systems such as: Co{sub 10%} / Ni5% - CeO{sub 2}; Co{sub 10%} / Ni{sub 5%} - CeO{sub 2}ZrO{sub 2}; Co{sub 10%} / Ni{sub 5%} - ZrO{sub 2}; Co{sub 10%} / Ni{sub 5%} - La{sub 2}O{sub 3}; Co{sub 10%} / Ni{sub 5%} - CeO{sub 2}La{sub 2}O{sub 3}/K{sub 2%}; Co{sub 10}% / Ni{sub 5%} - CeO{sub 2}La{sub 2}O{sub 3} / Na{sub 2%}; Ni{sub 10%} / Co{sub 5%} - CeO{sub 2}La{sub 2}O{sub 3}; Co-Al{sub 2}O{sub 3} e Co-Al{sub 2}O{sub 3}CeO{sub 2}. (author)

  19. At NA3

    CERN Multimedia

    1978-01-01

    The photo shows the proportional chamber PC1 of the NA3 forward spectrometer. The chamber was placed downstream the beam dump and specially designed to support a high flux of particles, see Nucl. Instrum. Methods 175 (1980) 319. Anta Diop stands on the foreground, right.

  20. The NA35 experiment

    CERN Multimedia

    1987-01-01

    The NA35 experiment ran on the Super Proton Synchrotron (SPS) accelerator at CERN. It was used for the study of relativistic nucleus-nucleus collisions which were used to search for evidence of new types of quark matter. Quarks are found inside protons and neutrons, which in turn make up atoms.

  1. Riso na epilepsia

    Directory of Open Access Journals (Sweden)

    Edymar Jardim

    1967-06-01

    Full Text Available São estudados três casos de síndrome convulsiva temporal, com manifestações concomitantes de riso na sua fase inicial. As características principais foram a imotivação e á incoercibilidade do riso. Esses sintomas desapareceram com o uso de anticonvulsivantes.

  2. At NA5

    CERN Multimedia

    1978-01-01

    The NA5 experiment is shown at the start of the setting up in beam H2 of hall EHN1. It was designed by the Bari- Cracow-Liverpool-Munich (MPI) Collaboration to study hard hadron-hadron collisions with a streamer chamber vertex spectrometer and a calorimeter trigger. The beam from target T2 enters from the left. E

  3. Konstrukce sila na cukr

    OpenAIRE

    Kotík, Libor

    2015-01-01

    Předmětem diplomové práce je statický návrh a posudek předpjatého sila na 50000t cukru. Zpracován je výpočtový model ocelové střešní konstrukce a jeho působení na konstrukci sila. Je stanoveno zatížení od uskladněného cukru. Je proveden optimální návrh a posouzení na mezní stav použitelnosti a únosnosti betonářské výztuže a vodorovného předpětí stěny sila včetně lokálních namáhání. Dále je proveden návrh betonářské výztuže dna sila a sloupu v podsilí a posouzení na mezní stav únosnosti. Součá...

  4. Biotecnologia na agricultura

    Directory of Open Access Journals (Sweden)

    Helaine Carrer

    2010-01-01

    Full Text Available A expectativa de o crescimento populacional atingir 9 bilhões de habitantes em 2050 em adição às questões da sustentabilidade e do aquecimento global nos desafiam a aumentar a oferta de alimentos. Uma metodologia alternativa que contribua para a redução do impacto desse cenário envolve a biotecnologia, que, nas últimas décadas, trouxe marcantes oportunidades tecnológicas na agricultura, resultando em relevante desenvolvimento na obtenção de novas variedades de plantas, na melhoria da qualidade de diversos alimentos e atualmente também na bioenergia. As técnicas biotecnológicas envolvendo os marcadores moleculares, a genômica e a transformação genética estão transformando a agricultura e são discutidas neste artigo.The expected population growth to reach 9 billion by 2050 in addition to issues of sustainability and global warming challenges us to increase the supply of food. An alternative approach to help reducing the impact of this scenario involves biotechnology which in recent decades has brought remarkable technological opportunities in the agriculture that resulted in relevant development in obtaining new plant varieties, improved quality of different foods, and now also in bioenergy. The biotechnology techniques involving molecular markers, genomics and genetic transformation are transforming agriculture and will be discussed in this article.

  5. Influence of luminous intensity on textile effluent photodegradation = Influência da intensidade luminosa na fotodegradação de efluente têxtil

    Directory of Open Access Journals (Sweden)

    Veronice Slusarski Santana

    2005-01-01

    Full Text Available Degradation tests were carried out to determine the luminous intensityinfluence on textile industry effluent photodegradation. TiO2, Nb2O5, Nb2O5-TiO2 and Nb2O5/TiO2 were used as photocatalysts. FTIR (Fourrier Transform Infrared and TPR (Temperature Program Reduction results showed interaction between different forms of the oxides in the Nb2O5-TiO2 and Nb2O5/TiO2 catalysts and the forming of a new phase inNb2O5-TiO2. The reaction rate was significantly influenced by the luminous intensity. Luminous intensity decrease caused decolourisation increase and COD reduction decrease, suggesting that the concentration of the hydroxyl groups, which are responsible for the chromophores groups degradation, is proportional to the luminous intensity. Testes de degradação foram realizados com o objetivo de determinar a influência da intensidade luminosa na fotodegradação de um efluente industrial têxtil. Como fotocatalisadores foram utilizados TiO2, Nb2O5, Nb2O5-TiO2 e Nb2O5/TiO2. Os resultados de FTIR (Infravermelho com Transformada de Fourriere RTP (Redução à Temperatura programada mostraram a existência de interação entre os óxidos de forma diferenciada nos catalisadores Nb2O5-TiO2 e Nb2O5/TiO2 e a formação de uma nova fase no Nb2O5-TiO2. A taxa de reação foi significativamente influenciada pela intensidade luminosa. A redução da intensidade luminosa ocasionou o aumento da descoloração e a diminuição da redução de DQO, sugerindo que a concentração dos grupos hidroxila, que são responsáveis pela degradação dos grupos cromóforos, é proporcional à intensidade luminosa.

  6. Synthesis NiAl{sub 1,0}Fe{sub 1,0}O{sub 4} catalyst by the combustion reaction to their use in the shift reaction (WGSR); Sintese do catalisador de NiAl{sub 1,0}Fe{sub 1,0}O{sub 4} por reacao de combustao visando sua utilizacao na reacao de shift (WGSR)

    Energy Technology Data Exchange (ETDEWEB)

    Santos, P.T.A.; Costa, A.C.F.M.; Neiva, L.S.; Gama, L. [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Dept. de Engenharia de Materiais; Argolo, F.; Andrade, H.M.C. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Quimica

    2009-07-01

    This work aims at the synthesis of catalyst NiAl{sub 1,0}Fe{sub 1,0}O{sub 4} by combustion reaction using urea as fuel, to evaluate its performance in the production of hydrogen by the reaction of displacement of water vapor (WGSR). The initial composition of the solution was based on valencia total oxidizing and reducing reagents based on the concepts of the chemistry of propellants, using container as a crucible of glassy silica. The resulting powder was characterized by X-ray diffraction, infrared spectroscopy, nitrogen adsorption isotherms (BET), scanning electronic microscope and catalytic tests. The DRX results reveal the presents majoritary phase NiAl{sub 1,0}Fe{sub 1,0}O{sub 4} spinel, the catalyst presents surface area 28 m{sup 2}/g and isotherms type III. Higher conversion CO/CO{sub 2} of 75% CO conversion observed at 500 deg C and catalytic activity of 43 mmolg{sup -1}.h{sup -1} at 450 deg C. (author)

  7. Estudo microestrutural do catalisador Ni/gama-Al2O3: efeito da adição de CeO2 na reforma do metano com dióxido de carbono Microstructural study of Ni/gamma-Al2O3 catalyst: addition effects of CeO2 on carbon dioxide reforming of methane

    Directory of Open Access Journals (Sweden)

    Antoninho Valentini

    2003-10-01

    Full Text Available The carbon dioxide reforming of methane was carried out over nickel catalysts supported on the gamma-Al2O3/CeO2 system prepared by wet impregnation. With the increase of the CeO2 weight in the catalyst, a higher stability was observed in the catalytic activity, together with an excellent resistance to carbon deposition and a better Ni dispersion. The catalysts were characterized by means of surface area measurements, TPR, H2 chemisorption, XRD, SEM, EDX, XPS and TEM. An interaction between Ni and CeO2 was observed to the Ni/CeO2 sample after activation in a H2 atmosphere above 300 ºC. Such behavior has a significantly influence on the catalytic activity.

  8. Estudo do efeito de tratamentos térmicos em catalisadores de PtRu/C frente à reação de oxidação de hidrogênio na presença de CO Study of the effect of thermal treatments of PtRu/C catalysts on the hydrogen oxidation reaction in the presence of CO

    Directory of Open Access Journals (Sweden)

    Pietro Papa Lopes

    2007-10-01

    Full Text Available In this work the effects of time and temperature of thermal treatments under reducing atmosphere (H2 on PtRu/C catalysts for the hydrogen oxidation reaction (HOR in the presence of CO on a proton exchange membrane fuel cell (PEMFC single cells have been studied. It can be seen that the increase of the treatment temperature leads to an increasing sintering of the catalyst particles with reduction of the active area, although the catalyst treated at 550 ºC presents more CO tolerance for the HOR.

  9. Influência do agente de cloração do catalisador à base de veodímio e da razão molar Cl: Nd na polimerização do butadieno Influence of the chlorinating agent of neodymium based catalysts and Cl: Nd molar ratio on butadiene polymerization

    Directory of Open Access Journals (Sweden)

    Cintia N. Ferreira

    2009-06-01

    Full Text Available Neste trabalho foi utilizado um sistema catalítico composto por hidreto de diisobutilalumínio (DIBAH, versatato de neodímio (NdV e um agente de cloração para avaliar a influência da fonte de cloro e da razão molar Cl:Nd nas características da reação de polimerização (conversão e constante de velocidade de propagação e do polibutadieno (massa molecular e microestrutura. Os agentes de cloração estudados foram cloreto de t-butila (t-BuCl, sesquicloreto de etilalumínio (EASC e cloreto de dietilalumínio (DEAC. As razões molares Cl:Nd utilizadas foram: 1:1, 3:1 e 5:1 para o t-BuCl; 0,5:1, 1:1 e 3:1 para o EASC e 1:1, 1,5:1, 3:1 e 5:1 para o DEAC. Foi observada a existência, para cada agente de cloração, de um valor ótimo de razão molar Cl:Nd para o qual a conversão foi máxima. O DEAC apresentou uma maior conversão em relação aos outros agentes de cloração; em contrapartida, o t-BuCl produziu polibutadienos com maior teor de unidades 1,4-cis e maior massa molecular (n e wIn this work catalyst systems consisting of diisobutylaluminium hydride (DIBAH, neodymium versatate (NdV and a chlorinating agent were employed to study the influence of the chloride source and Cl:Nd molar ratio on 1,3-butadiene polymerization and polybutadiene's characteristics (molecular weight and microstructure. The chloride sources studied were t-butyl chloride, ethylaluminium sesquichloride (EASC and diethylaluminium chloride (DEAC. The Cl:Nd molar ratios used were 1:1, 3:1 e 5:1 for t-butyl chloride; 0.5:1, 1:1 and 3:1 for EASC and 1:1, 1.5:1, 3:1 and 5:1 for DEAC. A maximum value of Cl:Nd molar ratio exists. Moreover, DEAC showed to be more reactive than EASC and t-BuCl but t-BuCl produced higher molecular weight and cis-1,4 units contents.

  10. Clays as green catalysts in the cholesterol esterification: spectroscopic characterization and polymorphs identification by thermal analysis methods. An interdisciplinary laboratorial proposal for the undergraduate level; Argilas como catalisadores verdes na esterificacao do colesterol: caracterizacao espectroscopica e identificacao de polimorfos por metodos de analise termica. Uma proposta laboratorial interdisciplinar para o primeiro ciclo universitario

    Energy Technology Data Exchange (ETDEWEB)

    Maria, Teresa M R.; Nunes, Rui M. D.; Pereira, Mariette M.; Eusebio, M. Ermelinda S. [Universidade de Coimbra, Coimbra (Portugal). Dept. de Quimica], e-mail: troseiro@ci.uc.pt

    2009-07-01

    A laboratory experiment that enables the professor to introduce the problematic of sustainable development in pharmaceutical chemistry to undergraduate students is proposed, using a simple synthetic procedure. Cholesteryl acetate is prepared by the esterification of cholesterol using Montmorillonite K10 as heterogeneous catalyst. Cholesterol and cholesteryl acetate are characterized by spectroscopic ({sup 1}H RMN, {sup 13}C RMN, FTIR) and thermal analysis techniques. The thermal methods are used to introduce the concepts of polymorphism and the nature of mesophases. (author)

  11. Efeito da concentração do catalisador acetilacetonato férrico na cura de poliuretano à base de polibutadieno líquido hidroxilado (PBLH) e diisocianato de isoforona (IPDI) Effect of ferric acetylacetonate catalyst concentration on the cure of polyurethane based on hydroxy terminated polybutadiene and isophorone diisocyanate

    OpenAIRE

    Willian César Paterlini; Edson Cocchieri Botelho; Luís Cláudio Rezende; Vera Lucia Lourenço; Mirabel Cerqueira Rezende

    2002-01-01

    The reaction between hydroxy-terminated polybutadiene and isophorone diisocyanate constitutes the base of the curing process of the most composite solid propellant used in the propulsion of solid rocket propellant. In this work, differential scanning calorimetry and viscosity measurements were used to evaluate the effect of the ferric acetylacetonate catalyst concentration on the reaction between HTBR and IPDI. These analyses show one exotherm, which shifts to lower temperatures as the cataly...

  12. Effect of Y{sub 2}O{sub 3} addition to Rh/Al{sub 2}O{sub 3} catalysts on the autothermal reforming of methane; Efeito da adicao de Y{sub 2}O{sub 3} a catalisadores de Rh/Al{sub 2}O{sub 3} na reforma autotermica do metano

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, Vanessa Monteiro; Cardoso, Gabriel Alexandre Lima; Coutinho, Ana Carla da S. Lomba S.; Passos, Fabio Barboza [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Dept. de Engenharia Quimica e de Petroleo. Lab. de Reatores, Cinetica e Catalise (RECAT)]. E-mail: vanessafisqui@yahoo.com.br

    2008-07-01

    In this work, the effect of the addition of Y{sub 2}O{sub 3} (with 2%, 5% and 10% weight content) on Rh/{alpha}-Al{sub 2}O{sub 3} catalysts in the autothermal reforming reaction of methane to the production of hydrogen for fuel cells was investigated. The catalysts were characterized by the following techniques: N{sub 2} adsorption, H{sub 2} chemisorption, X-ray diffraction (XRD) and cyclohexane dehydrogenation reaction. The catalysts were also evaluated in the reaction of autothermal reforming. The catalyst with higher Y{sub 2}O{sub 3} content showed the best results both in the cyclohexane dehydrogenation rate and in the conversion of methane. (author)

  13. XRD (X-Ray Diffraction) and nitrogen adsorption characterization of Ni-Pt/mordenite catalysts; Caracterizacao por EDX (Espectrometria de Raios-X), DRX (Difracao de Raios-X) e adsorcao de nitrogenio de catalisadores Ni/Pt/mordenita visando sua aplicacao na isomerizacao de n-hexano

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Geovana do Socorro V.; Sousa, Bianca V.; Rodrigues, Meiry Glaucia F. [Universidade Federal de Campina Grande (UFCG), PB (Brazil)

    2008-07-01

    The search for molecules of high octane arose great interest in the isomerization processes. Catalysts to the zeolite base have been wide developed for the n-paraffins isomerization. In this work, bimetallic bifunctional catalysts supported on Mordenite zeolite were prepared samples containing 60Pt40Ni (wt.%) metal (Pt). The catalysts were obtained by competitive ion exchange using aqueous solutions of [Pt(NH{sub 3}){sub 4}]Cl{sub 2} and Ni(NH{sub 3}){sub 6}]Cl{sub 2} complexes. The EDS characterization analyses showed incorporation of the nickel and platinum mordenite zeolite. The diffractograms showed competitive ion exchange and calcination processes did not provoke appreciable changes in the zeolitic support framework. The peaks attributed to nickel and platinum oxides was possible to observe in the bimetallic catalysts 60Ni40Pt/MOR. The results of the N{sub 2} physical adsorption of the 60Ni40Pt/MOR showed that it did not have modification in the superficial area of the catalysts. (author)

  14. Catalisador Pd/gama-Al2O3: efeito do tamanho de partícula na atividade catalítica para combustão do CH4 Pd/gamma-Al2O3 catalyst: particle size effect in the catalytic ativity for CH4 combustion

    Directory of Open Access Journals (Sweden)

    Rogério Marcos Dallago

    2005-12-01

    Full Text Available Methane, the main constituent of natural gas (> 85%, is employed in large scale as an energy source (thermoelectric power plants, automobiles, etc. However, significant quantities of this gas contribute to the greenhouse effect. The catalytic combustion of methane can minimize these emissions. Palladium is one of the metals that shows the highest activity, depending on the different active forms of the metal. In this article, we focus on the influence of particle size and pretreatment on the catalytic performance of palladium in the methane combustion reaction.

  15. Use of heterogeneous CaO and SnO{sub 2} catalysts supported on rice husk ash to produce biodiesel; Emprego de catalisadores heterogeneos de CaO e SnO{sub 2} suportados em cinza de casca de arroz na obtencao de biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Ana Brigida [Instituto Federal do Espirito Santo, Vitoria, ES (Brazil); Silva, Paulo Roberto Nagipe da; Stumbo, Alexandre Moura, E-mail: nagipe@uenf.br [Laboratorio de Ciencias Quimicas, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ (Brazil); Freitas, Jair C.C. [Departamento de Fisica, Centro de Ciencias Exatas, Universidade Federal do Espirito Santo, Vitoria, ES (Brazil)

    2012-07-01

    Silica obtained from rice husk after acid leaching and calcination was compared to commercial silica as a catalyst support. CaO and SnO{sub 2} catalysts were prepared by impregnation and tested in the transesterification of soybean oil and the esterification of oleic acid. CaO catalysts showed basic character and were the most active for transesterification, whereas SnO{sub 2} catalysts were acid and the most effective for esterification. In both cases the performances of the catalysts prepared with rice husk ash and commercial silica were similar. These results demonstrate that rice husk is a cost-effective and environmentally-friendly source of silica that can be used as a catalyst support. (author)

  16. Evaluation of the urea content in the synthesis by combustion reaction of the NiAl{sub 2}O{sub 4} catalysts; Avaliacao do teor de ureia na sintese por reacao de combustao do catalisador NiAl{sub 2}O{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Leal, E.; Sousa, J.-P.L.M.L.; Costa, A.C.F.M.; Gama, L. [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais; Argolo, F. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Quimica; Sasaki, J.M. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Fisica

    2009-07-01

    The aim of this work is to evaluate the influence of the urea fuel in the structure and morphology of the NiAl{sub 2}O{sub 4} prepared by combustion reaction. The powders were prepared according to the propellants and explosives theory, using urea in the stoichiometric composition, with 10% of excess and deficiency of this fuel. The samples were characterized by XRD, FTIR, particle size distribution and textural analysis by nitrogen adsorption (BET/BJH). The DRX results showed the presence of NiAl{sub 2}O{sub 4} as major phase and traces of NiO for all the samples. Also show crystallites size between 13 and 21 nm. All the samples showed large agglomerates size distribution, with D{sub 50%} between 18.6 and 20.4 {mu}m, and morphology with irregular plates shape. The increase of the urea content caused an increase in the particle size and a reduction in the surface area, from 270 to 52 m{sup 2}/g. (author)

  17. Efeito da concentração do catalisador acetilacetonato férrico na cura de poliuretano à base de polibutadieno líquido hidroxilado (PBLH e diisocianato de isoforona (IPDI Effect of ferric acetylacetonate catalyst concentration on the cure of polyurethane based on hydroxy terminated polybutadiene and isophorone diisocyanate

    Directory of Open Access Journals (Sweden)

    Willian César Paterlini

    2002-05-01

    Full Text Available The reaction between hydroxy-terminated polybutadiene and isophorone diisocyanate constitutes the base of the curing process of the most composite solid propellant used in the propulsion of solid rocket propellant. In this work, differential scanning calorimetry and viscosity measurements were used to evaluate the effect of the ferric acetylacetonate catalyst concentration on the reaction between HTBR and IPDI. These analyses show one exotherm, which shifts to lower temperatures as the catalyst concentration increases. The viscosity analyses show that the increase of temperature causes, at first, a reduction in the mixture viscosity, reaching a minimum range called gelification region (increasing the crosslinking density.

  18. SODOBNI PLES NA SLOVENSKEM

    OpenAIRE

    Marinko, Jožica

    2013-01-01

    Diplomsko delo predstavlja temo sodobni ples na Slovenskem. Podrobneje je predstavljena zgodovina sodobnega plesa v Sloveniji − od prvih zacetkov, pa do danes. Predstavljene so pomembne osebnosti, ki so sodobnemu plesu utrle pot in mu pomagale, da je iz zacetnega ljubiteljstva prerasel v profesionalnost. Navedene so težave, s katerimi so se spopadali sodobni plesalci, in težave, s katerimi se spopadajo še danes. Izpostavljen je problem šolanja plesalcev, predstavljena so dru...

  19. ROČNA ZASTAVNA PRAVICA NA PREMIČNINAH

    OpenAIRE

    Benko, Ana

    2013-01-01

    Ročna zastavna pravica na premičninah (pignus) je oblika zavarovanja terjatev, pri kateri je dodatno jamstvo za izpolnitev dolžnikove obveznosti vrednost zastavljene stvari. Bistvena značilnost ročne zastavne pravice na premičninah je njena posestnost. O posesti oziroma neposesti govorimo z vidika zastavnega upnika. Po vsebini je ročna zastavna pravica podobna pridržni (retencijski) pravici. Njen predmet je lahko vsaka premična stvar, ki je v pravnem prometu in ima neko prometno vrednost. Je ...

  20. Kotelny na biomasu

    OpenAIRE

    Egerle, Dušan

    2013-01-01

    Projekt řeší vytápění a přípravu teplé vody pro bytový dům v Chocni (Pardubický kraj). Bytový dům má tři nadzemní vytápěná podlaží a jedno podzemní nevytápěné podlaží. Zdrojem tepla je zplynovací kotel na dřevo, resp. kotel na pelety, který zároveň slouží pro přípravu teplé vody v zimním období, po ostatní část roku jsou na přípravu teplé vody nainstalovány solární kolektory. Zdroj tepla je umístěn v oddělené a samostatně přístupné místnosti, v kotelně....

  1. Cenzura na Internetu

    OpenAIRE

    Žila, Milan

    2011-01-01

    Tato práce se zabývá problémem cenzury na internetu v Číně. Práce popisuje formy a způsoby internetové cenzury v Číně. Zároveň uvádí i možnosti zjištění, ověření a obcházení cenzury pomocí různých nástrojů, aplikací a internetových služeb. Práce obsahuje výsledky provedených testů určených k ověření a zjištění cenzurovaných webových stránek a klíčových slov z různých lokací v Číně. Na základě těchto testů jsou vyvozeny závěry o cenzuře na internetu v Číně. This thesis deals with the p...

  2. The role of organic solvent amount in the lipase-catalyzed biodiesel production O papel da concentração de solvente orgânico na produção enzimática de biodiesel

    Directory of Open Access Journals (Sweden)

    Clarissa Dalla Rosa

    2010-03-01

    Full Text Available This research note addresses the role of organic solvent amount in the production of fatty acid ethyl esters from soybean oil. N-hexane was chosen as solvent and two commercial immobilized lipases as catalysts, Novozym 435 and Lipozyme IM. The reactions were conducted in 6 hours, varying the solvent to oil ratio from zero to 50 (v/wt and adopting adopting for Novozym 435: 65 ºC, enzyme concentration (E, wt% = 5, oil to ethanol molar ratio (R = 1:10, water addition (H, wt% = 0, and for Lipozyme IM: 35 ºC, E = 5 wt%, R = 1:3, H = 10 wt%. For Lipozyme IM, an increase in solvent amount is shown to lead to an enhancement of reaction conversion, while a negligible effect was found for Novozym 435. When using 30 mL of solvent the reaction conversions were 88% for Lipozyme IM and 15% for Novozym 435.O objetivo desta pesquisa é reportar o papel da quantidade do solvente orgânico na produção de ésteres etílicos de ácidos graxos do óleo de soja. O n-hexano foi escolhido como solvente e duas lipases comerciais imobilizadas como catalisadores, Novozym 435 e Lipozyme IM. As reações foram conduzidas em 6 horas, variando a razão de solvente de zero a 50 (v/m, adotando para a Novozym 435: 65 ºC, concentração de enzima (E, m/m% = 5, razão mola óleo:etanol (R = 1:10, adição de água (H, m/m% = 0, e para a Lipozyme IM: 35 ºC, E = 5 m/m%, R = 1:3, H = 10 m/m%. Para a enzima Lipozyme IM, um aumento na quantidade de solvente conduz a uma maior conversão da reação, enquanto um efeito não significativo foi encontrado para a Novozym 435. Com 30 mL de solvente, a conversão encontrada para a Lipozyme IM foi de 88% e 15% para a Novozym 435.

  3. A epilepsia na neurocisticercose

    Directory of Open Access Journals (Sweden)

    Luís Marques-Assis

    1972-12-01

    Full Text Available Foram estudados 131 casos de epilepsia com etiologia cisticercótica comprovada. A idade variou de 2 a 68 anos; 75 pacientes eram de sexo masculino e 56 de sexo feminino; 117 eram brancos, 10 pardos, três pretos e um amarelo. A idade de início da doença predominou na primeira década. O estudo foi feito em relação ao tipo de epilepsia, ao tempo decorrido após a primeira crise, à freqüência das crises e ao eletrencefalograma relativamente às epilepsias em geral. Investigação foi feita também em relação à cefaléia, aos achados neurológicos, liquóricos, radiológicos simples e contrastados e anátomo-patológicos. A análise dos resultados permitiu aos autores as seguintes conclusões: 1 No grupo de neurocisticercose o início da doença predominou na primeira e a partir da quarta década em relação às epilepsias em geral. 2 Dentre as manifestações clínicas predominaram as formas convulsivas da doença (61%, sendo as crises bravas-jacksonianas as menos freqüentes (4%; quando comparadas com as epilepsias em geral, verifica-se incidência menor das convulsões generalizadas na neurocisticercose. 3 Quanto ao tempo de doença, verifica-se predomínio das formas de duração mais curta (um ano ou menos na neurocisticercose. 4 A severidade da epilepsia, traduzida pela freqüência das crises, foi menor no grupo com neurocisticercose. 5 Excluídos os casos com anormalidades eletrencefalográficas contínuas, foram encontrados maiores índices percentuais de EEG normal na neurocisticercose que nas epilepsias em geral. 6 A cefaléia estava presente em 68% dos casos, assumindo caráter paroxístico na maior parte (78%; em 67% dos casos com cefaléia paroxística não havia concomitantemente sinais de hipertensão intracraniana; nos casos com cefaléia contínua, em apenas dois (13% esses sinais não estavam presentes. 7 Na maior parte dos casos (62% as manifestações epilépticas se apresentaram isoladamente, sem sinais neurol

  4. Miocardiopatia dilatada na infancia

    OpenAIRE

    Madureira, José Rubens Alcantara

    2013-01-01

    Resumo: Com objetivo de estudar a evolução e obter informações prognosticas da Miocardiopatia Dilatada na infância. Foram Estudados 70 pacientes internados no Centro de Cardiologia Infantil do Paraná, do Hospital infantil Pequeno Príncipe, em Curitiba, no período de Janeiro de 1985 a janeiro de 1995. Todos os pacientes foram internados por ocasião da primeira consulta hospitalar, tendo sido realizados exame clínico, radiografia de tórax, eletrocardiograma e ecocardiograma regularmente, no int...

  5. Rawls na planini?

    OpenAIRE

    Kurelić, Zoran

    1994-01-01

    Autor prikazuje komunitarističku kritiku Rawlsa, prije svega u obliku koji je izložio Michael Walzer u knjizi "Spheres of Justice". Glavni prigovor Walzera i drugih komunitaraca Rawlsovoj teoriji pravednosti da je ona objektivistička i da stoga predstavlja modernu varijantu platoizma. Nasuprot takvoj poziciji, Walzer inzistira na teoriji pravednosti koja polazi od partikularnih vrijednosti pojedinačnog društva i kulture, te sam nastoji formulirati kritiku američkog društva kao zajednice podvr...

  6. na Perua

    Directory of Open Access Journals (Sweden)

    Jorge Carvalho

    1989-01-01

    Full Text Available Antes de se caracterizar como tentativa de ensaio ou de análise a qualquer coisa, o presente artigo tem, antes de mais nada, a pretensão de se constituir uma provocação ao debate acerca da questão do esporte na escola. A provocação parte basicamente do relato da minha experiência pessoal como Secretário da Educação do Município de Aracaju, cargo que exerci no período de 1º de janeiro de 1986 a 27 de janeiro de 1987.

  7. Stress laboral na PSP

    OpenAIRE

    Passeira, Andrea Verónica Vaz

    2011-01-01

    Dissertação de Mestrado em Segurança e Higiene no Trabalho O presente Estudo foi aplicado a profissionais da polícia do Comando Metropolitano de Lisboa da PSP. O objectivo principal subjacente a este trabalho foi proceder à análise da problemática do stress, nos profissionais da PSP que constituem a nossa amostra. Para tal, a metodologia utilizada consistiu na aplicação de um conjunto de Questionários, designadamente, “Fontes de Stress”, “Sintomas de Stress”, “Estratégias de C...

  8. PROMOCIJA ZDRAVJA NA DELOVNEM MESTU

    OpenAIRE

    Kondić, Vesna

    2015-01-01

    Varnost in zdravje pri delu sta ključna elementa pri zagotavljanju bolj zdravega in daljšega poklicnega življenja. Problem: Delo neposredno vpliva na zdravje, saj ljudje na delovnem mestu preživijo veliko časa, zato je zagotavljanje varnosti in zdravja delavcev pri delu zelo pomemben člen, ki ga mora delodajalec tudi zakonsko upoštevati. Namen: Namen magistrskega dela je proučiti učinkovitost promocije zdravja na delovnem mestu z vidika varovanja zdravja zaposlenih in ozaveščanja zap...

  9. Valores na escola

    Directory of Open Access Journals (Sweden)

    Menin Maria Suzana De Stefano

    2002-01-01

    Full Text Available Neste texto pretende-se discorrer sobre valores morais na escola e suas implicações para a formação de professores. Para tanto discutir-se-á, em primeiro lugar, e brevemente, o que são valores morais, ou éticos, e como a escola pode situar-se em relação a eles. Em seguida, serão relatadas algumas observações a respeito de valores de professores e práticas daí decorrentes. São comentados resultados de pesquisa que ilustram a transmissão de valores de forma doutrinal e a educação moral e cívica tal como realizada na ditadura militar, e, por outro lado, a posição relativista e/ou de laissez-faire que certas escolas podem adotar, metodologicamente, sobre a educação em valores. Finalmente, defender-se-á a idéia de que é necessária uma discussão sobre valores pelos diversos membros da escola e uma opção por uma metodologia para ensiná-los, seja os professores, em sua formação inicial e continuada, seja os alunos. A teoria de desenvolvimento moral de Jean Piaget será apresentada como uma referência possível para a educação em valores. Exemplos de situações escolares de conflito de valores entre direção, pais e alunos são discutidas para ilustrar como uma escola pode adotar um procedimento democrático de educação em valores, que se apresenta como um terceiro caminho possível de educação moral nas escolas, além das posições doutrinárias ou relativistas.

  10. A aposta na filosofia

    Directory of Open Access Journals (Sweden)

    Márcio Suzuki

    2011-12-01

    Full Text Available Para Hume, filosofar é uma atividade semelhante às demais ocupações humanas. A decisão que leva à atividade filosófica é menos resultado de uma argumentação teórica do que fruto de um cálculo prático, que é entendido como uma caça ou um jogo. O objetivo deste trabalho será o de mostrar que no jogo filosófico perde quem joga sério demais. A aposta na filosofia tem que passar pelo bom humor e pela diversão: uma resposta a Pascal?For Hume, philosophy is in itself neither more nor less important than other human activities. On the contrary, it can be explained from its resemblance with game and hunting. If one chooses to dedicate himself to philosophy, his decision is not the consequence of logical reasoning, but depends on practical evaluation, which has something to do with gambling. The following text tries to show that in philosophy, like in other games, the loser will be the one who plays too earnestly. The philosophical game requires good humour and some relaxation: Is this a good answer to Pascal's pari?

  11. VPLIV MEDIJEV NA PORAST KRIMINALITETE

    OpenAIRE

    Plešivčnik, Petra

    2011-01-01

    V diplomski nalogi sem podrobneje predstavila vpliv medijev na kriminaliteto in skušala ugotoviti ali imajo mediji kakšen vpliv na porast le-te. V prvem poglavju sem se osredotočila na zastavitev nekaterih hipotez skozi diplomsko nalogo, nato pa nadaljevala z razvojem medijev, razčlenitvijo množičnih medijev in predstavila nekaj njihovih učinkov. V tretjem poglavju sem povzela korelacijo med nasiljem in posameznikom, ter bolj konkretno nadaljevala s predstavitvijo same kriminalitete v medijih...

  12. VPLIV KULTURE NA MOTIVACIJO ZAPOSLENIH

    OpenAIRE

    Gjergjek, Andreja

    2012-01-01

    Pri diplomskem delu smo se osredotočili na proučevanje kulture in motivacije. Opredelili smo pojem kulture in njene sestavine. V okviru nacionalne kulture smo opredelili dela Hofsteda, Trompenaarsa, Halla, Ronena in Shenkara. V nadaljevanju smo opredelili pojem motivacije in predstavili motivacijske dejavnike. Pojasnili smo tudi vpliv kulture na motivacijo zaposlenih. Kultura je način ţivljenja pripadnikov neke druţbe. Obsega celotno področje idej, navad, prepričanj, jezika, vzorcev vedenj...

  13. TRGOVANJE NA IZBRANEM TRGU - FOREX

    OpenAIRE

    Ambrož, Sabina

    2012-01-01

    V delu diplomskega seminarja je obravnavana tematika trgovanja na valutnem trgu. Trgovanje z valutami je v zadnjem desetletju doseglo velik razvoj, močno pa je narasla tudi priljubljenost valutnega trga Forex, saj se zaradi enostavnega pristopa in možnosti velikih zaslužkov zanj odloča vse več posameznikov. V teoretičnem delu povzamemo ključne elemente, ki jih mora poznati začetnik na tem trgu. V empiričnem delu pa poskušamo na praktičnem primeru pokazati primer trgovanja s trendom in vstopom...

  14. Uwarunkowania procesu transformacji na Ukrainie

    OpenAIRE

    Michalski, Tomasz; Kuczabski, Aleksander

    2014-01-01

    W pierwszej części artykułu omówiono główne czynniki (wewnętrzne i zewnętrzne), które wpłynęły na procesy transformacji ustrojowej w europejskich i zakaukaskich krajach postkomunistycznych. W drugiej części artykułu skupiono się na czynnikach, które zadecydowały, że jak dotychczas proces transformacji ustrojowej na Ukrainie jest bardzo słabo zaawansowany.

  15. Studies on NaXe Clusters

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The chemical shift of 23Na in excimer NaXe was measured by using nuclear magnetic resonance (NMR) spectra, which is in good agreement with the theoretical value obtained by ab initio calculations. The bond length, dissociation energy, dipole of NaXe and Mulliken charges at Na and Xe in NaXe were calculated, respectively. The spectra of ultraviolet (UV) fluorescence and surface-enhanced Raman scattering of NaXe were also measured.

  16. Results from NA61/SHINE

    Directory of Open Access Journals (Sweden)

    Unger M.

    2013-06-01

    Full Text Available In this paper we summarize recent results from NA61/SHINE relevant for heavy ion physics, neutrino oscillations and the interpretation of air showers induced by ultra-high energy cosmic rays.

  17. Na via do Behemoth

    Directory of Open Access Journals (Sweden)

    Gérard Rabinovitch

    2008-06-01

    Full Text Available O momento nazista permanece um enigma impensado de que a cultura contemporânea continua cativa. O autor levanta a hipótese de que a persistência desse enigma e seus estragos duráveis se devem à insistência dos pensamentos político, sociológico e filosófico em construírem o nazismo à luz da metáfora hobbesiana do Leviatã. Propõe retomar a questão do nazismo sob a perspectiva do Behemoth, antônimo do Leviatã. Para tanto, sugere a necessidade de retornar a Freud e à psicanálise, balizas de um possível novo pensamento do político que escrutine a destrutividade nazista. Propõe ainda sondar as homologias entre nazismo, corjas e máfias, com base na figura da " heroicização da violência" que lhes seria comum. E avança um modelo " econômico" : a quimera, suscetível de capturar o caráter heterotópico e heterocrônico de sua construção criminosa.The paths of Behemoth. The Nazi moment remains as the thoughtless enigma of which contemporary culture is still captive. The author raises the hypothesis where the persistency of this enigma and its durable damages are due to the insistence of the political, social and philosophical thoughts in building the Nazism at the view of the Hobbesian metaphor of Leviathan. It is here proposed to resume the Nazism matter under Behemoth's perspective, antonym to Leviathan. For such, it is suggested a necessity to look back at Freud and the psychoanalysis, structured by a possible new political thought which scrutinizes the destructivity of the Nazism. It is also here proposed to gaze at the homologies between Nazism, mafias and gangs, with a base in the figure of " violence as a heroically act" that are their common ground. The author also advances an economical model: the chimera susceptible to capture the heterotopic and heterochronic character of its criminal construction.

  18. Na Deposition on MnO(100)

    Science.gov (United States)

    Feng, Xu; Cox, David F.

    2016-03-01

    Na deposition on the MnO(100) surface was investigated by temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). Na TPD and XPS results indicate that adsorbed Na interacts strongly with the MnO substrate to form an irreversibly-adsorbed, oxidic Na compound on the surface for coverages up to 1 monolayer (ML). This strongly-bound Na diffuses into the MnO subsurface and bulk at elevated temperatures above 500 K. For Na coverages above 1 ML, metallic Na is present and desorbs from the surface below 500 K. The deposition of Na on MnO(100) follows a Stranski-Krastanov (SK) growth mode, with the formation of metallic Na islands following completion of the first Na monolayer. After Na deposition, the surface exhibits a diffuse (1 × 1) LEED pattern, suggesting the formation of disordered Na overlayers. After heating to 1000 K, the surface presents a (2 × 2) LEED pattern indicating that a surface reconstruction is induced by the diffusion of Na into the near surface region. CO2 can be used as a probe molecule in TPD to distinguish between metallic Na islands and oxidic Na in the first ML, and to indicate when Na that is still observable by XPS goes subsurface.

  19. Utjecaj spola na pacijentovu procjenu nadomjestaka na gornjim prednjim zubima

    OpenAIRE

    KRISTEK ZORIĆ, Ela; Žagar, Maja; KNEZOVIĆ ZLATARIĆ, Dubravka

    2014-01-01

    Svrha rada: Željelo se istražiti zadovoljstvo pacijenata izgledom nadomjestaka na gornjim prednjim zubima i ustanoviti postoji li razlika u procjeni njihova izgleda s obzirom na spol. Materijali i metode: Dvjesto pacijenata ocjenjivalo je boju, anatomski oblik i površinsku teksturu nadomjestaka (kompozitni ispuni, fasetirane krunice, metalkeramičke i potpuno keramičke krunice) uspoređujući ih sa susjednim prirodnim zubima. Podatci su izraženi u prosječnim ocjenama boje, anatomskog oblika i po...

  20. Corpo e sexualidade na gravidez

    Directory of Open Access Journals (Sweden)

    Natalúcia Matos Araújo

    2012-06-01

    Full Text Available Estudo etnográfico que teve como objetivo compreender como as gestantes vivenciam os processos fisiológicos do seu corpo durante a gestação e a sua repercussão na sexualidade. A pesquisa envolveu sete mulheres residentes em bairro popular de São Paulo. Na coleta de dados, utilizou-se observação participante e entrevista com questões norteadoras. Os dados foram apresentados na forma de narrativa e posteriormente organizados nas categorias: Percebendo as transformações corporais; Convivendo com as mudanças no corpo; Sentimentos e sensações na vida sexual durante a gestação e imaginando o corpo e a sexualidade após a gestação. As mulheres referiram-se às transformações do corpo como desconfortos e expressaram a preocupação de que fossem definitivas. Expressaram o desejo de que, após o parto, o corpo volte a ser como era e que volte a sentir desejo sexual. O reconhecimento destes fatos constitui-se numa ferramenta primordial na adequação das práticas profissionais.

  1. All new for NA62

    CERN Multimedia

    Antonella Del Rosso

    2012-01-01

    This week sees the start of the first run of the new NA62 experiment. This will be a unique opportunity for the collaboration to test its new beam, new detectors and new data acquisition system before the physics run in 2014. Speaking to the Bulletin, the NA62 technical coordinator Ferdinand Hahn shares the many challenges that the various teams faced to be on time for beam. Ready, steady, start!   A Large Angle Veto detector (white) in place in the NA62 decay volume (blue). With components from almost all the detectors in place downstream of the decay point of the mother particles – the kaons – and of the KTAG detector that tags the kaons before they decay, NA62 is ready for its first technical run. This unique run will test all the equipment as well as the trigger and the data acquisition systems. “This year, we will have about five weeks of beam from the SPS before the long shutdown of all the CERN machines,” says Ferdinand Hahn, NA62 Technical Co-...

  2. Catálise de hydrocraking baseado em zeólitos

    OpenAIRE

    Gregório, André Filipe da Cunha

    2015-01-01

    O trabalho experimental consistiu numa primeira fase na caraterização da atividade hidrogenante de catalisadores bifuncionais de Hydrocracking (HDC) por via da reação de hidrogenação do tolueno (HT). Os catalisadores eram constituídos por uma fase metálica constante (Pt/Al2O3) misturados fisicamentecom zeólito HUSY e HBEA. Os aspetos a destacar dos resultados dos testes catalíticas, centram-se no facto da atividade hidrogenante não depender apenas dos centros metálicos acessíveis, ...

  3. gigapanorama of NA 62 cavern

    CERN Multimedia

    Brice, Maximilien

    2015-01-01

    The image shows the new rare Kaon decay experiment at CERN, called NA62. The NA62 experiment is 270 metres long and includes a 120-metre-long vacuum tank, shown here, housing several of the particle detectors. (Note: the experiment axis is a straight line, the curving of the tank is an optical effect of the photo.) Kaons are particles that decay into lighter elementary particles. The kaon decay processes are mostly well known, except for some very rare decay modes. For example, NA62 is investigating a rare decay predicted by the Standard Model in which a kaon decays into one pion and two neutrinos. This process occurs only once every 10 billion decays. The understanding of such ultra-rare decays are of great importance because they test the Standard Model in energy ranges not accessible by direct measurements. They are therefore complementary to the measurements at the LHC. ultra high definition on demand (photolab@cern.ch).

  4. Criatividade na Gestalt–terapia

    Directory of Open Access Journals (Sweden)

    Patrícia Albuquerque Lima

    2009-04-01

    Full Text Available Como se conceitua criatividade na teoria da Gestalt–terapia? Qual o papel e a função da criatividade nesta abordagem? O que se considera como um comportamento criativo no senso comum é tão diferente do que compreendemos, na abordagem gestáltica, como criatividade? Estas são algumas das perguntas sobre as quais buscaremos transcorrer ao longo deste artigo. Partimos de simples perguntas, pois talvez um bom recurso para se “tratar” da criatividade seja a curiosidade. Para isto, iremos apresentar a contribuição de alguns autores que discorreram sobre o tema da criatividade em suas obras, iniciando por Kurt Goldstein e sua Teoria Organísmica, que consideramos o principal substrato teórico para se pensar a criatividade na Gestalt–terapia.

  5. Capsazepine, a synthetic vanilloid that converts the Na,K-ATPase to Na-ATPase

    DEFF Research Database (Denmark)

    Mahmmoud, Yasser Ahmed

    2008-01-01

    . Drawing on previous homology modeling studies of Na,K-ATPase to atomic models of sarcoplasmic reticulum Ca-ATPase and on kinetic data, we propose that CPZ uncouples an Na+ cycle from an Na+/K+ cycle in the pump. The Na+ cycle possibly involves transport through the recently characterized Na+-specific site...

  6. KAZNIVA DEJANJA NA CIVILNIH LETALIH

    OpenAIRE

    Vöröš, Tina

    2014-01-01

    Letalska industrija je ena izmed najhitreje rastočih industrij na svetu in je še kako pomembna v življenju mnogih, ki potujejo. Zaradi prisotnosti terorizma v letalstvu in vseh preteklih napadov na civilna letala, ki so terjali številne žrtve, je varovanje pred dejanji nezakonitega vmešavanja v civilno letalstvo ena izmed glavnih prioritet vseh letališč in letalskih prevoznikov ter nekaterih mednarodnih organizacij. Varnost letala pa znajo ogroziti tudi neposlušni in napadalni potniki, ki iz ...

  7. Mobbing - zlostavljanje na radnome mjestu

    OpenAIRE

    Šoljan, Ivana; Josipović-Jelić, Željka; Jelić Kiš, Anita

    2008-01-01

    Mobbing odnosno zlostavljanje na radnome mjestu predstavlja neprijateljsku i neetičnu komunikaciju, koja je sustavno usmjerena od jednoga ili više pojedinaca prema, uglavnom, jednom pojedincu, koji je zbog mobbinga gurnut u poziciju u kojoj je bespomoćan ili se ne može obraniti te držan u njoj s pomoću stalnih zlostavljačkih (mobinških) aktivnosti. U članku je obrađeno nekoliko bitnih značajki zlostavljanja: ponašanja karakteristična za zlostavljača, organizacijski uzroci pojave, konflikt u p...

  8. VPLIV VODJE NA RAZVOJ SODELAVCEV

    OpenAIRE

    Fabjan, Jožica

    2011-01-01

    Razvoj in uspešnost podjetja sta tesno povezana z razvojem vseh, ki v podjetju delajo. Ljudje, ki so opremljeni z ustreznimi znanji, sposobnostmi in veščinami, so strateškega pomena, ter zagotovo eden ključnih dejavnikov konkurenčnosti in uspešnosti sodobnega časa. Odločilno vlogo pri usmerjenem razvoju ljudi v organizaciji, strokovnjaki pripisujejo vodjem na vseh hierarhičnih ravneh organizacijske strukture podjetja. V diplomski nalogi, ki je razdeljena na teoretični in empirični del smo...

  9. Cistična fibroza

    OpenAIRE

    Tješić-Drinković, Dorian; Tješić-Drinković, Duška

    2015-01-01

    Cistična fibroza je najčešća nasljedna, autosomalno recesivna bolest koja utječe na dužinu života u bijeloj rasi. Danas je prepoznato više stotina mutacija uz veliku varijaciju ekspresije bolesti. Prepoznavanje bolesnika i nosilaca mutacije pruža mogućnost genskog savjetovanja i prevencije bolesti. Rano dijagnosticiranje, sve češće pomoću neonatalog probira, omogućuje rani multidisciplinarni terapijski pristup uz značajno produljenje životnog vijeka i sve većeg broja odraslih bolesnika. Dužin...

  10. Criatividade na Gestalt–terapia

    OpenAIRE

    Patrícia Albuquerque Lima

    2009-01-01

    Como se conceitua criatividade na teoria da Gestalt–terapia? Qual o papel e a função da criatividade nesta abordagem? O que se considera como um comportamento criativo no senso comum é tão diferente do que compreendemos, na abordagem gestáltica, como criatividade? Estas são algumas das perguntas sobre as quais buscaremos transcorrer ao longo deste artigo. Partimos de simples perguntas, pois talvez um bom recurso para se “tratar” da criatividade seja a curiosidade. Para isto, iremos apresentar...

  11. Li Na Aces French Open

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Chinese tennis player becomes the first Asian to win a Grand Slam singles title Chinese tennis player Li Na beat defending champion Francesca Schiavone from Italy,6-4,7-6,on the clay court at Roland Garros,winning the 2011 French Open Tennis Tournament on June 4.She made history by becoming the first Chinese to win a grand slam singles title.

  12. NA60 frees the quarks

    CERN Multimedia

    2003-01-01

    Fitted with new state-of-the-art silicon detectors, NA60 is prepared to study the phase transition from confined hadronic matter to a deconfined (free) quark-gluon plasma, a state of matter which probably existed an instant after the Big Bang.

  13. NA49: lead ion collision

    CERN Multimedia

    1995-01-01

    This is an image of an actual lead ion collision taken from tracking detectors on the NA49 experiment, part of the heavy ion project at CERN. These collisions produce a very complicated array of hadrons as the heavy ions break up. It is hoped that one of these collisions will eventually create a new state of matter known as quark-gluon plasma.

  14. NA49: lead ion collision

    CERN Multimedia

    1995-01-01

    This is an image of an actual lead ion collision taken from the NA49 experiment, part of the heavy ion project at CERN. These collisions produce a very complicated array of hadrons as the heavy ions break up. It is hoped that one of these collisions will eventually create a new state of matter known as the quark-gluon plasma.

  15. NA62: Hidden Sector Physics

    CERN Document Server

    Cesarotti, Carissa Joyce

    2016-01-01

    Modern experimental physics is often probing for new physics by either finding deviations from predictions on extremely precise measurements, or by looking for a new signal that cannot be explained with existing models. The NA62 experiment at CERN does the former by measuring the ultra-rare decay $K^+ \\rightarrow \\pi^+ \

  16. Europlanet NA2 Science Networking

    Science.gov (United States)

    Harri, Ari-Matti; Szego, Karoly; Genzer, Maria; Schmidt, Walter; Krupp, Norbert; Lammer, Helmut; Kallio, Esa; Haukka, Harri

    2013-04-01

    Europlanet RI / NA2 Science Networking [1] focused on determining the major goals of current and future European planetary science, relating them to the Research Infrastructure that the Europlanet RI project [2] developed, and placing them in a more global context. NA2 also enhanced the ability of European planetary scientists to participate on the global scene with their own agenda-setting projects and ideas. The Networking Activity NA2 included five working groups, aimed at identifying key science issues and producing reference books on major science themes that will bridge the gap between the results of present and past missions and the scientific preparation of the future ones. Within the Europlanet RI project (2009-2012) the NA2 and NA2-WGs organized thematic workshops, an expert exchange program and training groups to improve the scientific impact of this Infrastructure. The principal tasks addressed by NA2 were: • Science activities in support to the optimal use of data from past and present space missions, involving the broad planetary science community beyond the "space club" • Science activities in support to the preparation of future planetary missions: Earth-based preparatory observations, laboratory studies, R&D on advanced instrumentation and exploration technologies for the future, theory and modeling etc. • Develop scientific activities, joint publications, dedicated meetings, tools and services, education activities, engaging the public and industries • Update science themes and addressing the two main scientific objectives • Prepare and support workshops of the International Space Science Institute (ISSI) in Bern and • Support Trans National Activities (TNAs), Joined Research Activities (JRAs) and the Integrated and Distributed Information Service (IDIS) of the Europlanet project These tasks were achieved by WG workshops organized by the NA2 working groups, by ISSI workshops and by an Expert Exchange Program. There were 17 official WG

  17. Papel do sal iodado na oxidação lipídica em hambúrgueres bovino e suíno (misto ou de frango The role of iodide salts on beef and chicken patties lipid oxidation

    Directory of Open Access Journals (Sweden)

    E.A.F.S. TORRES

    1998-04-01

    Full Text Available No Brasil, a adição de iodo ao sal, com o objetivo de erradicar o bócio, é obrigatório por lei. A adição de sal em produtos cárneos é um problema para a qualidade dos mesmos; tem sido associada à oxidação lipídica e à descoloração de carnes com a presença de metais atuando como catalisadores. Hambúrgueres elaborados com dianteiro bovino e gordura suína ou recortes de frangos, adicionados de gelo, sal, cebola, alho e pimenta in natura foram usados no experimento. Após moldados, os mesmos foram congelados, embalados e estocados. O experimento foi conduzido em triplicata e as amostras retiradas em duplicatas no tempos de 0 a 90 dias. O método de TBA de destilação foi utilizado para acompanhar a oxidação lipídica. Foram determinadas a composição centesimal e os teores de cloreto. Os hambúrgueres misto(carne suína e bovina apresentaram teor de lipídios de 73,31% e por um outro lado, a oxidação lipídica foi mais 54,40% mas ativa nas amostras de frango. A presença de sal iodado (menor que 14,41% parece não ter afetado a oxidação lipídica em ambas as carnes, contrariando a expectativa de que um sal halogênico deveria atuar como um oxidante.In Brazil it’s a legal practice to add iodide to salt. Lipid oxidation is a problem to the quality of meat products. NaCl added to this products acts as a catalyst in lipid oxidation. It has been associated to increasing of TBARS index and also to meat discoloration because of metals contamination. We studied the lipid stability in patties prepared with salt with or without iodide, and mixed with meat from chicken or beef. Ground meat was mixed and ice, salt, onion, garlic and white powder pepper were added, shaped, packaged and stored in freezer. Lipid oxidation was monitored by TBARS (distillation method, in frozen samples and iodide was quantitatively measured throughout 90 days of experiment. The content of lipids in beef samples was 73,31% higher than for chickens one. On

  18. VPLIV NACIONALNE KULTURE NA ODVIJANJE POGAJANJ

    OpenAIRE

    Borko, Vanja

    2014-01-01

    Vse več podjetij posluje na mednarodnih trgih, kjer se srečujejo s tujimi kulturami. Vzpostavitev poslovnega odnosa v tuji državi zahteva prilagojeno komunikacijo. Pogajanje je vrsta poslovne komunikacije, s katero želimo doseči dogovor. V diplomskem projektu smo ponazorili vpliv kulturnih razlik na odvijanje pogajanj. Projekt je razdeljen na pet poglavij. V uvodu predstavljamo glavni problem pogajanj, ki je nezadostna priprava na pogajanje in nerazumevanje medkulturnih razlik. Naslednje pogl...

  19. NA

    OpenAIRE

    Braga, Ataide R.

    1998-01-01

    The purpose of this research is to investigate when a Just-In-Time (JIT) inventory management technique is a worthwhile approach to managing inventories. Some experts in the field maintain that the additional transportation costs derived from using JIT and its costs due to frequent shipping is more than offset by the reduction in inventory levels. In this study a simulation is developed using the cost structure of Naval Air Station Lemoore for managing a selected group of items. Lemoore is co...

  20. NA

    OpenAIRE

    Dobel, Tracy A.

    1998-01-01

    This thesis examines progress toward gender integration at the Navy Recruit Training Command (RTC) in Great Lakes, Illinois. The study is largely descriptive, and attempts to determine if gender discrimination or gender bias occurs in the Navy's recruit training classes. The study adopted a definition of gender discrimination and gender bias by the American Association of University Women in a 1992 evaluation of gender equity in the educational setting. Focus group interviews were conducted w...

  1. NA

    OpenAIRE

    Dunn, Joseph F.

    1998-01-01

    The primary purpose of this thesis is to examine the legal ramifications of conducting Government Agency contracting on the Internet. The author proposes that the Internet is a suitable medium on which to process and conduct all aspects of Government contracting. The thesis examines the current legal issues surrounding contract formation across the open architecture of the Internet. The thesis then examines the latest cryptological schemes for both encryption and decryption and the logistical...

  2. Corpo e velhice na contemporaneidade

    Directory of Open Access Journals (Sweden)

    Gabriela Felten da Maia

    2014-04-01

    Full Text Available A inegável atenção dada ao corpo na sociedade inspirou a construção deste trabalho, visto que os imperativos atuais são a beleza, a forma e o vigor. A velhice e a inexorabilidade da morte apresentam-se para este ideal como incômodos que devem ser afastados através de diversos hábitos "saudáveis" e “rejuvenescedores”, como a ginástica, os cosméticos, as vitaminas, procedimentos estético-cirúrgicos, entre outros. O modo de “ser velho”, então, passa a ser configurado não mais por estereótipos negativos, mas a partir de um ethos em que os idosos são apresentados como saudáveis, joviais, engajados, produtivos e autoconfiantes. São corpos que ultrapassam as marcas do tempo, atléticos, firmes e lisos. Logo, aqueles que não aderem a este ethos podem tornar-se desviantes, estranhos, velhos, ultrapassados e precisam, portanto, serem descartados ou escamoteados. Tendo em vista estas questões, o presente trabalho propõe-se a discutir sobre o tema velhice, corpo e sociedade, na tentativa de problematizar sobre os atuais modos de subjetivação e o envelhecimento na contemporaneidade.

  3. NA50 quark-gluon plasma experiment

    CERN Multimedia

    1997-01-01

    View of the NA50 detector, which studies quark-gluon plasma. The picture shows one of the six hodoscopes, made of 48 scintillator counters, used in the muon trigger of the NA50 spectrometer. The picture shows one of the six hodoscopes, made of 48 scintillator counters, used in the muon trigger of the NA50 spectrometer

  4. Solid state diffusion of NaCl into NaY zeolite studied by positron annihilation

    International Nuclear Information System (INIS)

    A series of samples, prepared from mechanical mixtures of NaCl with NaY zeolite and resulting in the dispersion of NaCl in NaY, was studied by position annihilation spectroscopy. We measured the positron lifetime spectroscopy as a function of the weight ratio of the NaCl-NaY zeolite heated at 500 degree C for 1 h, as a function of the heating temperature held for 1 h, and as a function of the heating duration at 500 degree C for NaCl/NaY (15%). All the lifetime spectra were resolved into five components, in which the third, fourth and fifth components are related to the positron annihilation in β cage, supercage and interface void respectively. The experimental results showed that position annihilation spectroscopy is sensitive to the change of the dispersion of NaCl in NaY zeolite

  5. Silicene for Na-ion battery applications

    Science.gov (United States)

    Zhu, Jiajie; Schwingenschlögl, Udo

    2016-09-01

    Na-ion batteries are promising candidates to replace Li-ion batteries in large scale applications because of the advantages in natural abundance and cost of Na. Silicene has potential as the anode in Li-ion batteries but so far has not received attention with respect to Na-ion batteries. In this context, freestanding silicene, a graphene-silicene-graphene heterostructure, and a graphene-silicene superlattice are investigated for possible application in Na-ion batteries, using first-principles calculations. The calculated Na capacities of 954 mAh/g for freestanding silicene and 730 mAh/g for the graphene-silicene superlattice (10% biaxial tensile strain) are highly competitive and potentials of \\gt 0.3 {{V}} against the Na{}+/Na potential exceed the corresponding value of graphite. In addition, the diffusion barriers are predicted to be \\lt 0.3 {eV}.

  6. Nióbia sintética modificada como catalisador na oxidação de corante orgânico: utilização de H2O2 e O2 atmosférico como oxidantes Modified synthetic niobia as catalyst in the oxidation of organic dye: utilization of H2O2 and atmospheric O2 as oxidants

    Directory of Open Access Journals (Sweden)

    Kele T. G. Carvalho

    2009-01-01

    Full Text Available In this work synthetic niobia was used to promote the oxidation of methylene blue dye in aqueous medium. The niobia was characterized by N2 adsorption/desorption, XRD and TG measurements. The presence of reactive species on the niobia surface strongly increased the oxidation rate of the methylene blue dye. The reaction mechanism was studied by ESI-MS suggesting that the oxidation of the organic dye involve oxidizing species generated mainly after previous treatment with H2O2. It can be observed that the catalyst is a good material in the activation of gas (atmospheric oxygen or liquid (hydrogen peroxide oxidant agent with a total discoloration of the dye solution after only 1 h of reaction.

  7. Argilas como catalisadores verdes na esterificação do colesterol: caracterização espectroscópica e identificação de polimorfos por métodos de análise térmica. Uma proposta laboratorial interdisciplinar para o 1º ciclo universitário Clays as green catalysts in the cholesterol esterification: spectroscopic characterization and polymorphs identification by thermal analysis methods. An interdisciplinary laboratorial proposal for the undergraduate level

    Directory of Open Access Journals (Sweden)

    Teresa M. R. Maria

    2009-01-01

    Full Text Available A laboratory experiment that enables the professor to introduce the problematic of sustainable development in pharmaceutical chemistry to undergraduate students is proposed, using a simple synthetic procedure. Cholesteryl acetate is prepared by the esterification of cholesterol using Montmorillonite K10 as heterogeneous catalyst. Cholesterol and cholesteryl acetate are characterized by spectroscopic (¹H RMN, 13C RMN, FTIR and thermal analysis techniques. The thermal methods are used to introduce the concepts of polymorphism and the nature of mesophases.

  8. The NA52 strangelet search

    CERN Document Server

    Weber, M; Baglin, C; Beck, H P; Borer, K; Bussière, A; Elsener, K; Gorodetzky, P; Guillaud, J P; Kabana, S; Klingenberg, R; Lehmann, G; Lindén, T; Lohmann, K D; Mommsen, R K; Moser, U; Pretzl, Klaus P; Schacher, J; Spiwoks, R; Tuominiemi, Jorma

    2001-01-01

    The NA52 experiment searches for long-lived charged strangelets in 158 a GeV c/sup -1/ Pb+Pb collisions at CERN SPS. The experiment is able to identify single particles coming from the collisions at p/sub t/=0. We collected 10/sup 13/ Pb+Pb interactions looking for negatively charged strangelets and 3*10/sup 11/ Pb+Pb interactions for positively charged ones. No evidence for the production of strangelets has been observed. We present here resulting experimental differential and total upper production limits. (8 refs).

  9. OGLED FIZIKALNIH EKSPERIMENTOV NA DALJAVO

    OpenAIRE

    Hladen, Sašo

    2012-01-01

    Fizikalni eksperiment je najosnovnejše in najpomembnejše orodje za motivacijo, razlago snovi, utrjevanje in dokazovanje fizikalnih pojavov in zakonov. V drugem poglavju smo govorili o uporabi računalnika v izobraževanju in fiziki. Govorimo o zgodovinskem vključevanju računalnika v izobraževanje, o značilnostih fizikalnih eksperimentov in uporabi računalnika pri pouku fizike. Govorimo še o tipu aplikacij, ki omogočajo spremljanje in izvajanje fizikalnih eksperimentov na daljavo, ter spoznam...

  10. Design pistole na laser game

    OpenAIRE

    Krakovský, Jakub

    2014-01-01

    Předmětem této bakalářské práce je design pistole na laser game. Cílem je vytvořit funkční návrh futuristické zbraně respektující technické, ergonomické a estetické požadavky. The main subject of this bachelor thesis is to design the laser game gun. The goal of the design is to create a functional concept of futuristic gun respecting technical, ergonomic and aesthetic requirements. D

  11. Micotoxinas e Micotoxicoses na Avicultura

    Directory of Open Access Journals (Sweden)

    Santurio JM

    2000-01-01

    Full Text Available Esta revisão tem como objetivo principal mostrar, baseado em dezenas de pesquisas realizadas, os efeitos tóxicos das micotoxinas aflatoxinas, tricotecenos, zealenona e fumonisinas sobre o desempenho das aves. O descobrimento das propriedades hepatotóxicas e hepatocarcinogênicas de algumas linhagens de Aspergillus flavus e A. parasiticus em perus, na Inglaterra, no início da década de 1960, seguida pela elucidação da estrutura de seus metabólitos tóxicos, as aflatoxinas, deu novo enfoque e prioridade para a pesquisa sobre micotoxinas. Análises de aflatoxinas realizadas no Laboratório de Análises Micotoxicológicas (LAMIC da Universidade Fedaral de Santa Maria, entre os anos de 1986 e janeiro de 2000, em 15.600 amostras de alimentos destinados principalmente ao consumo animal, demonstram que no milho analisado, 41,9% das amostras estavam contaminadas por aflatoxinas. Em surtos de aflatoxicose no campo, uma das características mais marcantes é a má absorção que se manifesta como partículas de ração mal digeridas na excreta das aves. Também observa-se, em frangos e poedeiras que recebem AFL, extrema palidez das mucosas e pernas. Dietas deficientes em riboflavina ou colecalciferol (vit. D tornaram frangos sensíveis, nos índices de desenvolvimento corporal, a concentrações muito baixas de AFL. O efeito aflatoxina nos frangos é maior na fase inicial de crescimento, ou seja, quando as aves ingeriram aflatoxina nos primeiros 21 dias de vida, e quanto maior o nível de stress do lote, menor a quantidade de AFL para afetar negativamente seu desempenho, seja na produção de carne ou de ovos. As principais micotoxinas do grupo dos tricotecenos são: toxina T-2; deoxynivalenol (DON; diacetoxyscirpenol (DAS, todas produzidas através de diversas espécies de fungos do gênero Fusarium. Além dos tricotecenos, o fusarium também pode produzir zearalenona e fumonisinas. Dessas fusarium-toxinas, somente toxina T-2 gera patologias s

  12. Low-spin states of 23Na

    International Nuclear Information System (INIS)

    A study of 23Na via the 22Ne(p,γ)23Na and 23Na(γ,γ)23Na reactions is presented. Only a limited number of resonances has been studied, selected on the basis of strong excitation of the lowest levels of which the spin was unknown. As a result the spins are now known of all levels of 23Na with excitation energies up to 7 MeV, except for a few high-spin states which are too weakly excited in the decay of the known 22Ne(p,γ) resonances. The mean lifetimes of the 23Na levels at 4.43 and 7.89 MeV were found to be 350±70 and 220±17 attoseconds (1 attosecond = 10-18 seconds) respectively. 97 refs.; 22 figs.; 12 tabs

  13. Rota hidrometalúrgica de recuperação de molibdênio, cobalto, níquel e alumínio de catalisadores gastos de hidrotratamento em meio ácido Hydrometallurgical route to recover molybdenum, nickel, cobalt and aluminum from spent hydrotreating catalysts in acid medium

    Directory of Open Access Journals (Sweden)

    Ivam Macedo Valverde Júnior

    2008-01-01

    Full Text Available This work describes a hydrometallurgical route for processing spent commercial catalysts (CoMo and NiMo/Al2O3. Samples were preoxidized (500 ºC, 5 h in order to eliminate coke and other volatile species present. The calcined solid was dissolved in concentrated H2SO4 and water (1:1 vol/vol at 90 ºC; the insoluble matter was separated from the solution. Molybdenum was recovered by solvent extraction using tertiary amines at pH around 1.8. Cobalt (or nickel was separated by addition of aqueous ammonium oxalate at the above pH. Phosphorus was removed by passing the liquid through a strong anion exchange column. Aluminum was recovered by neutralizing the solution with NaOH. The route presented in this work generates less final aqueous wastes because it is not necessary to use alkaline medium during the metal recovery steps.

  14. Vpliv vetrnih elektrarn na stabilnost elektroenergetskega sistema

    OpenAIRE

    GYOEFI, TOMI

    2014-01-01

    V diplomskem delu so, na podlagi literature, analizirane dinamične lastnosti različnih tipov vetrnih elektrarn v elektroenergetskem sistemu. Namen dela je ponuditi pregled generacije vetrne energije, pri katerem je poudarek na vplivu vetrnih elektrarn na stabilnost elektroenergetskega sistema. Podani so osnovni mehanizmi delovanja asinhronskega generatorja, dvojno napajanega asinhronskega generatorja in sinhronskega generatorja s pretvornikom, njihovo tranzientno obratovanje in zmožnost...

  15. SREDNJOVJEKOVNE GEMINAE NA OTOKU U SOLINU

    OpenAIRE

    Bužančić, Radoslav

    1998-01-01

    Na temelju dokumentacije iz Arhiva Dyggve i morfoloških elemenata na nedavno pronađenom Zečevićevu akvarelu stare župne crkve u Solinu, autor valorizira otkriće don Lovre Katića ranosrednjovjekovnih dvojnih crkava na Gospinu Otoku podignutih koncem 10. stoljeća po uzoru na zapadnoeuropske dvorove. U tekstu je ujedno korigirana i revalorizirana Karaman-Dyggveova teza i grafička rekonstrukcija crkava sv. Stjepana i sv. Marije.

  16. Analiza vsebine konservatorskih načrtov

    OpenAIRE

    Štukelj, Katja

    2016-01-01

    UVOD: Ohranjanje kulturne dediščine se začne s konservatorskim načrtom. Gre za dokument, v katerem so jasno napisane smernice in priporočila, kako in zakaj ohraniti spomenik. Prav tako so v njem ovrednoteni njegov pomen ter ranljivost in ogroženost. Za vse to je potreben enoten postopek vsebinske izdelave konservatorskih načrtov. Od leta 2009 to ureja Pravilnik o konservatorskem načrtu. NAMEN: Namen te raziskave je primerjati vsebino izbranih primerov konservatorskih načrtov, izdelanih v Slov...

  17. KARTICE ZVESTOBE V TRGOVINI NA DROBNO

    OpenAIRE

    Ferk, Aljaž

    2011-01-01

    Skozi diplomski seminar smo spoznali programe zvestobe odjemalcev, kateri nam pomagajo obdržati naše sedanje kupce tudi v prihodnosti. Programe zvestobe priporočamo vsem podjetjem ne glede na stroko, v kateri delujejo. Zadovoljen kupec se bo še vedno vračal nazaj k nam ter ostal zvest, dokler bomo zadovoljevali njegova pričakovanje glede naših izdelkov oz. storitev, njegova zvestoba pa nam bo prinašala dobiček. Primer programa zvestobe smo predstavili na podjetju Tuš Holding d.o.o., kater...

  18. NA-NET numerical analysis net

    Energy Technology Data Exchange (ETDEWEB)

    Dongarra, J. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science Oak Ridge National Lab., TN (United States)); Rosener, B. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science)

    1991-12-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host na-net.ornl.gov'' at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where a member is currently located. As long as moving members change their e-mail address in the NA-NET everything works smoothly. The NA-NET system is currently located at Oak Ridge National Laboratory. It is running on the same machine that serves netlib. Netlib is a separate facility that distributes mathematical software via electronic mail. For more information on netlib consult, or send the one-line message send index'' to netlib{at}ornl.gov. The following report describes the current NA-NET system from both a user's perspective and from an implementation perspective. Currently, there are over 2100 members in the NA-NET. An average of 110 mail messages pass through this facility daily.

  19. NA-NET numerical analysis net

    Energy Technology Data Exchange (ETDEWEB)

    Dongarra, J. [Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science]|[Oak Ridge National Lab., TN (United States); Rosener, B. [Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science

    1991-12-01

    This report describes a facility called NA-NET created to allow numerical analysts (na) an easy method of communicating with one another. The main advantage of the NA-NET is uniformity of addressing. All mail is addressed to the Internet host ``na-net.ornl.gov`` at Oak Ridge National Laboratory. Hence, members of the NA-NET do not need to remember complicated addresses or even where a member is currently located. As long as moving members change their e-mail address in the NA-NET everything works smoothly. The NA-NET system is currently located at Oak Ridge National Laboratory. It is running on the same machine that serves netlib. Netlib is a separate facility that distributes mathematical software via electronic mail. For more information on netlib consult, or send the one-line message ``send index`` to netlib{at}ornl.gov. The following report describes the current NA-NET system from both a user`s perspective and from an implementation perspective. Currently, there are over 2100 members in the NA-NET. An average of 110 mail messages pass through this facility daily.

  20. UTJECAJ KVALITETE NA ZADOVOLJSTVO I LOJALNOST STUDENATA

    OpenAIRE

    Puška, Adis; Maksimović, Aleksandar; Fazlić, Samira

    2015-01-01

    Pojava sve veće konkurencije na području visokog obrazovanja pridonijela je „borbi“ za svakoga studenta. Sve se više pažnje posvećuje potrebama i željama studenata. S implementacijom Bolonjskog procesa na visokoškolskim ustanovama sustav kvalitete dobiva sve više na značenju. Visokoškolske ustanove se okreću ka kvaliteti te stavljaju studente u prvi plan. Razlog tome je i sve veća konkurencija u visokom obrazovanju. Upravo se utjecajem sustava kvalitete na zadovoljstvo i lojalnost studenata b...

  1. Fabrication of Implanted $^{22}$Na Targets

    CERN Multimedia

    2002-01-01

    A knowledge of the $^{22}$Na(p,$\\gamma$)$^{23}$ Mg reaction rate is of significant astrophysical interest. In order to complete previous studies of this reaction, radioactive $^{22}$Na targets of high purity are required. We ask for support to fabricate these targets via the implantation technique at ISOLDE GPS (off—line mode) using $^{22}$Na nuclides in an Al matrix produced in Nov. 1990 at the PSI (Zürich). The $^{22}$Na nuclides are released and ionized in a surface ionisation source, mass-analyzed at ISOLDE GPS, and implanted in a Ni-Ta backing and a C—foil in a special implantation setup.

  2. NaHCO3 and NaC1 tolerance in chronic renal failure.

    Science.gov (United States)

    Husted, F C; Nolph, K D; Maher, J F

    1975-08-01

    In patients with chronic renal failure, NaHCO3 therapy may correct or prevent acidemia. It has been proposed that the NaHCO3 required will not result in clinically significant Na retention comparable to that from similar increases in NaC1 intake. In each of ten patients with chronic renal failure, creatinine clearance (Ccr) range 2.5-16.8 ml/min, on an estimated 10-meq Na and C1 diet, electrolyte excretion was compared on NaHCO3 vs NaC1 supplements of 200 meq/day. Periods of NaHCO3 and NaC1 (in alternate order for successive patients) lasted 4 days, separated by reequilibration to base-line weight. Mean +/- SEM excretion (ex) of Na, C1, and HCO3 and deltaCcr and deltaweight (day 4-1) are compared below for the 4th day of NaC1 vs. NaHCO3 intake. Mean Ccr +/-SEM on day 4 of NaC1 and NaHCO3 were 10.8 +/-1.6 and 9.0 +/-1.4 ml/min, respectively (P less than 0.02). Mean systolic blood pressure (but not diastolic) increased significantly on NaC1 (P less than 0.05). No significant blood pressure changes were seen on NaHCO3. Net positive HCO3 balance occurred on NaHCO3 as indicated above and reflected a rise in mean serum HCO3 from 19 to 30 meq/liter (day 1 vs. 4) (P less than 0.01). Mechanisms for the greater excretion of Na on NaHCO3 may relate to C1 wasting as noted above on low C1 intake and limited HCO3 reabsorptive capacity. Thus, Na excretion by day 4 was greater on NaHCO3 than on NaHCO3 did Na excretion near intake (210 meq/day).

  3. O consumo na vida digital

    Directory of Open Access Journals (Sweden)

    Iuri Yudi Furukita Baptista

    2016-02-01

    Full Text Available O modelo de consumo não possui as mesmas características sempre: suas relações, motivações, formatos, espaços, interesses e atividades são construções sociais que se modificam atreladas ao cenário econômico, político e tecnológico. O presente trabalho repassa o surgimento da sociedade do consumidor para então conjecturar sobre as propriedades distintivas do consumo na vida digital. O que se defende ao final é que o consumidor já não se restringe ao papel de consumir.

  4. Na+,K+-ATPase Na+ affinity in rat skeletal muscle fiber types

    DEFF Research Database (Denmark)

    Kristensen, Michael; Juel, Carsten

    2010-01-01

    Previous studies in expression systems have found different ion activation of the Na(+)/K(+)-ATPase isozymes, which suggest that different muscles have different ion affinities. The rate of ATP hydrolysis was used to quantify Na(+),K(+)-ATPase activity, and the Na(+) affinity of Na......(+),K(+)-ATPase was studied in total membranes from rat muscle and purified membranes from muscle with different fiber types. The Na(+) affinity was higher (K(m) lower) in oxidative muscle compared with glycolytic muscle and in purified membranes from oxidative muscle compared with glycolytic muscle. Na......) and alpha(2)beta(2), respectively. The affinity differences and isoform distributions imply that the degree of activation of Na(+),K(+)-ATPase at physiological Na(+) concentrations differs between muscles (oxidative and glycolytic) and between subcellular membrane domains with different isoform compositions...

  5. Dependence of intracellular Na+ concentration on apical and basolateral membrane Na+ influx in frog skin

    International Nuclear Information System (INIS)

    An isotopic method was developed to measure the intracellular Na+ content of the transepithelial Na+ transport pool of frog skin. Isolated epithelia (no corium) were labeled with 24Na either asymmetrically, from apical (Aa) or basolateral (Ab) solutions, or symmetrically (Aab). Transport pool Na+ could be identified from the kinetics of washout of 24Na carried out in the presence of 1 mM ouabain, 100 microM amiloride, and 1 mM furosemide that served to trap cold Na+ and 24Na within the transport pool. In control epithelia, Aab averaged 64.1 neq/cm2 (13.9 mM), and maximal inhibition of apical membrane Na+ entry with 100 microM amiloride caused Aab to decrease to 24.3 neq/cm2 (5.3 mM). Ouabain caused Aab to increase markedly to 303 neq/cm2 in 30 min, whereas amiloride inhibition of apical membrane Na+ entry reduced markedly the rate of increase of Aab caused by ouabain. These data, in part, confirmed the existence of an important basolateral membrane permeability to Na+ that was measured in separate studies of the bidirectional 24Na fluxes at the basolateral membranes of the cells. Both sets of data were supportive of the idea that a significant Na+ recycling exists at the basolateral membranes of the cells that contributes to the Na+ load on the pump and Na+ recycling participates in the regulation of the Na+ concentration of the Na+ transport pool of these epithelial cells

  6. Analiza lovskogojitvenega načrtovanja na primeru gorenjskega lovsko upravljavskega območja

    OpenAIRE

    Avsenek, Jernej

    2014-01-01

    V delu smo analizirali upravljanje s populacijami divjadi v Gorenjskem lovsko upravljavskem območju. Predstavili smo zakonsko ureditev tega področja v preteklosti in danes. Načrtovanje upravljanja z divjadjo je bilo v preteklostiv pristojnosti lovskih organizacij, danes pa upravljavske načrte izdeluje Zavod za gozdove Slovenije. Lovsko upravljavsko načrtovanje danes temelji na kontrolni metodi, pri tem pa uporablja kazalnike stanja populacij divjadi in njenega okolja. Za stanje populacij divj...

  7. Electron-Stimulated Emission of Na Atoms from NaCl Nanocube Corners

    OpenAIRE

    Ceresoli, D.; Zykova-Timan, T.; Tosatti, E.

    2006-01-01

    We performed first principles density functional calculations and simulations of magic-size neutral NaCl nanocubes, and computed the the extraction of a Na neutral corner atom after donating an electron. The atomic structure of the resulting Na corner vacancy is presented.

  8. SIMBOLNI ELEMENTI NA PODEŽELJU

    OpenAIRE

    Dravec, Barbara

    2014-01-01

    Namen diplomskega dela je prepoznati simbolne elemente in njihov pomen v izbranih naseljih v Prekmurju. Pri izdelavi diplomske naloge smo uporabili različne metode: od kabinetnih metod analize obstoječih pisnih virov do kartiranja simbolnih elementov na terenu. Ugotovili smo, da so simbolni elementi pomemben dejavnik, ki vpliva na morfološko strukturo naselij

  9. Inelastic processes in Na+-Ne, Na+-Ar, Ne+-Na, and Ar+-Na collisions in the energy range 0.5-14 keV

    Science.gov (United States)

    Lomsadze, R. A.; Gochitashvili, M. R.; Kezerashvili, R. Ya.

    2015-12-01

    Absolute cross sections for charge-exchange, ionization, and excitation in Na+-Ne and Na+-Ar collisions were measured in the ion energy range 0.5 -10 keV using a refined version of a capacitor method and collision and optical spectroscopy methods simultaneously in the same experimental setup. Ionization cross sections for Ne+-Na and Ar+-Na collisions are measured at energies of 2 -14 keV using a crossed-beam spectroscopy method. The experimental data and the schematic correlation diagrams are used to analyze and determine the mechanisms for these processes. For the charge-exchange process in Na+-Ar collisions two nonadiabatic regions are revealed and mechanisms responsible for these regions are explained. Structural peculiarity on the excitation function for the resonance lines of argon atoms in Na+-Ar collisions are observed and the possible mechanisms of this phenomenon are explored. The measured ionization cross sections for Na+-Ne and Ne+-Na collisions in conjunction with the Landau-Zener formula are used to determine the coupling matrix element and transition probability in a region of pseudocrossing of the potential curves.

  10. Bullying na Escola: um sofrimento

    Directory of Open Access Journals (Sweden)

    Marlene Silva Sardinha Gurpilhares

    2014-07-01

    Full Text Available O bullying é uma forma de violência presente nas escolas e o termo é utilizado para caracterizar todas as formas de agressões repetitivas psicológicas e físicas, direta ou indiretamente. Esta violência causa sofrimentos, intimidação e medo, sempre numa relação de poder entre pares. Esta pesquisa trata de um estudo do bullying escolar: o que é, como surgiu, como identificá-lo e sua caracterização, conseqüências, causas, o papel da escola, de professores e pais e uma proposta prática que pode ser adotada para sua prevenção e contenção. O objetivo é organizar materiais para leitura dos atores educacionais para uma possível reflexão, através de pesquisas bibliográficas. Esta violência é grave e deveria ser tratada como saúde pública, devido às conseqüências que traz, como queda na aprendizagem, na autoestima e em casos mais graves, até o suicido e outras tragédias. A escola necessita atentar para esse tipo de violência, revendo suas ações em todos os momentos, tendo um olhar integral e diferenciado em relação aos alunos. É fundamental que o bullying não seja tratado como brincadeira de criança e para ser identificado e combatido é necessária uma ação entre a família e todos da escola, que pode ser desenvolvida através de projetos que ajudem a apontar caminhos para a solução do problema. Tais ações devem ser pautadas por constantes debates e reflexões, nas quais o aluno se torne o protagonista. Não existem fórmulas prontas, pois a intervenção deve ser feita através da realidade de cada escola.

  11. Razvitak naselja na kvarnerskim otocima - primjer Dobrinja

    Directory of Open Access Journals (Sweden)

    Marijan Bradanović

    2012-12-01

    Full Text Available Na dosad slabo poznatom i sa stajališta povijesti umjetnosti još posve neobrađenom primjeru Dobrinja na otoku Krku, raspravlja se o razvitku naselja na kvarnerskim otocima. Uz isticanje štetnosti dosad prevladavajućih uopćavanja, karakteristični položaj i razvitak Dobrinja tumače se u širem, komparativnom kontekstu. Analiziraju se prostiranje i obilježja pojedinih dijelova ovog naselja, a naglasak je na vremenu kasnog srednjeg i ranijeg novog vijeka. Tada je najuži dio povijesnog središta Dobrinja poprimio čvrstu, na tlorisnoj osnovi i danas, usprkos opsežnim pregradnjama i arhitektonskim preinakama, jasno uočljivu, urbanu fizionomiju.

  12. Anodic Synthesis and Characterization of Na-Pb-O, Na-Pb-Bi-O Crystals

    Institute of Scientific and Technical Information of China (English)

    Li Mei QIU; Fen LIU; Liang Zhong ZHAO

    2005-01-01

    Crystals of Na-Pb-O and Na-Pb-Bi-O were electrosynthesized on the anode from molten salts. The resulting crystals have a hexagonal structure, in which the base ions (Pb and Bi) are in high oxidation states. By using KOH/NaOH (atomic ratio K:Na=1:1) mixture as a flux,incorporation of K ions into the lattice is inhibited while incorporation of Bi ions is enhanced. The magnetic measurement shows that the Na-Pb-Bi-O crystals are dominated by diamagnetism.

  13. Instrumenti na stanici za praćenje disanja Zemljine kore na RGN fakultetu Zagreb

    OpenAIRE

    Marjanović Kavanagh, Radovan

    2013-01-01

    Na RGN fakultetu u Zagrebu prvi je put u našoj zemlji uspješno puštena u pogon stanica za praćenje disanja Zemljine kore. U pogon stanice uključeni su različiti mjerni instrumenti: Permanentna Trimble GNSS-stanica, vertikalni ekstenzometar, dvokomponentni tiltmetar, jednokomponentni tiltmetar i stacionarni gravimetar LaCoste & Romberg ET 16. GNSS-antena postavljena je na stup na terasi iznad rudarskog okna i antenskim kabelom spojena na prijamnik koji je uz pomoć LAN-mreže povezan s centralni...

  14. OGLAŠEVANJE NA DRUŽBENIH OMREŽJIH NA PRIMERU FACEBOOKA

    OpenAIRE

    Novak, Martina

    2012-01-01

    V diplomskem delu obravnavamo družbene medije kot novo priložnost za promocijo in oglaševanje podjetij. Spoznali smo družbena omrežja na splošno in nekaj teh, ki jih uporabljamo tudi v Sloveniji na kratko predstavili. Podrobneje smo se osredotočili na družbeno omrežje Facebook, predvsem na samo spletno stran, njen izgled in storitve, ki jih ponuja uporabnikom. V nalogi je podrobneje opisan Facebook kot orodje za uporabo oglaševanja. Spoznali smo brezplačne in plačljive načine promocije in ogl...

  15. Study of the Na-C-O and Na-H-O ternary systems in the sodium rich corner

    International Nuclear Information System (INIS)

    The purpose of this study is to provide a contribution to the understanding of the sodium - carbon - oxygen and sodium - hydrogen - oxygen ternary systems in the sodium rich corner. In order to do this the Na-NaH-Na2O-NaOH phase diagram was completed and the Na-Na2O-Na2CO3-C phase diagram was outlined. This work is made up of two parts. The first is devoted to a critical literature survey essential to establish correct phase diagrams. The second is an experimental study followed by a discussion collating our finding to the literary data. The basic experimental technique used is differential thermal analysis (DTA) but it has been completed by quenching, X-ray and chemical analysis methods. The proposed phase diagrams imply that Na-NaH-Na2O-NaOH and Na-Na2O-Na2CO3-C systems are reciprocal ternary systems. Temperatures of stable pairs reversal are respectively 410 and 6900C. The stable pairs are Na-NaOH and Na-Na2CO3 at elevated temperature, Na2O-NaH and Na2O-C at low temperature

  16. Terapia de linguagem na afasia

    Directory of Open Access Journals (Sweden)

    Mauro Spinelli

    1977-12-01

    Full Text Available A terapia da linguagem na afasia foi estudada em 15 pacientes, 8 do sexo masculino e 7 do sexo feminino; a idade variou de menos de 10 anos a mais de 50 anos; em 11 casos a afasia era sequela de acidente vascular cerebral e, em 4, de traumatismo crânio-encefálico. Quanto ao tipo de afasia, 5 pacientes apresentavam déficits predominantemente de expressão e 10 apresentavam déficits receptivos e expressivos em graus equiparáveis. Em 6 casos a terapia foi iniciada dentro dos 3 primeiros meses de instalação do quadro; nos restantes foi iniciada mais tardiamente. Dos 15 pacientes, 11 apresentaram evolução satisfatória, a qual não depndeu do grau de afasia, do tipo de afasia, da idade do paciente, do tipo de patologia e do intervalo entre a instalação do quadro afásico e o início da terapia. A terapia da linguagem no paciente afásico é efetiva, o prognóstico não pode ser feito a priori. Somente a evolução do caso com sua retestagem criteriosa poderá dar dados realmente úteis para se falar em evolução.

  17. NaK handling and removal

    International Nuclear Information System (INIS)

    Sodium-potassium alloy is used in specific application in French Fast Breeder Reactors as: cold traps, NaK bubbler for argon purification, valves and also in experimental irradiation devices. lt has been preferred to sodium because it is liquid from + 7 deg. C for the most common peritectic alloy. After its use, NaK is considered as a hazardous waste (nuclear or not) due to its high reactivity with air and water. The most important risk remains in handling NaK systems which have not been operated for some time. The NaK will be covered with a crust of the superoxide K02 which is a strong oxidising agent. Thermodynamically, K02 will react with most organic material or metallic dust or swarfs and can also react with additional NaK to give sufficient heat to boil part of the NaK, resulting in a sudden increase in pressure and small explosions. We describe the formation given to experimenters in our Sodium School and the CEA's experience in treating specific devices for transportation, decanting of tanks, tank opening and NaK removal. (author)

  18. Gasotransmitters: novel regulators of epithelial na(+) transport?

    Science.gov (United States)

    Althaus, Mike

    2012-01-01

    The vectorial transport of Na(+) across epithelia is crucial for the maintenance of Na(+) and water homeostasis in organs such as the kidneys, lung, or intestine. Dysregulated Na(+) transport processes are associated with various human diseases such as hypertension, the salt-wasting syndrome pseudohypoaldosteronism type 1, pulmonary edema, cystic fibrosis, or intestinal disorders, which indicate that a precise regulation of epithelial Na(+) transport is essential. Novel regulatory signaling molecules are gasotransmitters. There are currently three known gasotransmitters: nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H(2)S). These molecules are endogenously produced in mammalian cells by specific enzymes and have been shown to regulate various physiological processes. There is a growing body of evidence which indicates that gasotransmitters may also regulate Na(+) transport across epithelia. This review will summarize the available data concerning NO, CO, and H(2)S dependent regulation of epithelial Na(+) transport processes and will discuss whether or not these mediators can be considered as true physiological regulators of epithelial Na(+) transport biology.

  19. Gasotransmitters: Novel regulators of epithelial Na+ transport?

    Directory of Open Access Journals (Sweden)

    Mike eAlthaus

    2012-04-01

    Full Text Available The vectorial transport of Na+ across epithelia is crucial for the maintenance of Na+ and water homeostasis in organs such as the kidneys, lung or intestine. Dysregulated Na+ transport processes are associated with various human diseases such as hypertension, the salt-wasting syndrome pseudohypoaldosteronism type 1, pulmonary edema, cystic fibrosis or intestinal disorders, which indicate that a precise regulation of epithelial Na+ transport is essential. Novel regulatory signaling molecules are gasotransmitters. There are currently three known gasotransmitters: nitric oxide (NO, carbon monoxide (CO and hydrogen sulfide (H2S. These molecules are endogenously produced in mammalian cells by specific enzymes and have been shown to regulate various physiological processes. There is a growing body of evidence, which indicates that gasotransmitters may also regulate Na+ transport across epithelia. This review will summarize the available data concerning NO, CO and H2S dependent regulation of epithelial Na+ transport processes and will discuss whether or not these mediators can be considered as true physiological regulators of epithelial Na+ transport biology.

  20. VPLIV EMBALAŽE NA PODOBO IZDELKA

    OpenAIRE

    Dominko, Peter

    2012-01-01

    Namen diplomskega seminarja je bil ugotoviti vpliv embalaže na podobo izdelka. Najprej smo bolj podrobno opredelili podobo in embalažo, v nadaljevanju pa smo na podlagi člankov in raziskav oba pojma povezali in ugotavljali pomen in vlogo embalaže na podobo izdelka. Prišli smo do ugotovitve, da je embalaža še posebej pomembna pri prvem nakupu izdelku, ko porabnik izdelka še ne pozna. Embalaža lahko namreč s svojim izgledom porabnika pritegne in povzroči, da porabnik izdelku nakloni pozorno...

  1. Pristup bolesniku sa sumnjom na akutni pankreatitis

    OpenAIRE

    Mikolašević, Ivana; Krznarić Zrnić, Irena; Štimac, Davor

    2013-01-01

    Kliničke manifestacije akutnog pankreatitisa širokog su spektra i često predstavljaju diferencijalno dijagnostički problem. U pristupu bolesniku sa sumnjom na razvoj akutnog pankreatitisa nužna je iscrpna anamneza i detaljan fizikalni pregled, što nam uz najmanje trostruko povećanje aktivnosti amilaza i dvostruko povećanje aktivnosti lipaza s velikom vjerojatnošću upućuje na razvoj akutne upale gušterače. Nužno je potom procijeniti težinu akutnog pankreatitisa, kako bismo pravo...

  2. PLESNO USTVARJANJE NA PODLAGI LITERARNEGA BESEDILA

    OpenAIRE

    Krajnc, Jožica; Zaponšek, Mojca

    2009-01-01

    Diplomsko delo z naslovom Plesno ustvarjanje na podlagi literarnega besedila je zapisano v okviru plesnega ustvarjanja otrok ob slikanici Bravo, putka!. V teoretičnem delu je obravnavan ples v povezavi z njegovim izražanjem in vzgojo. Ob tem je posebej izpostavljena estetika v plesu, sodobni ples ter balet. Poudarek je tudi na improviziranju in oblikovanju ter na dihanju in ritmu. Ob tem sta izpostavljena glasba in književnost kot pomembna motivacijska dejavnika. Teoretični del je nadgrajen s...

  3. Cancioneiro tradicional Galego: Instrumentos pobres na Escola

    OpenAIRE

    Calvo López, Alberte

    2013-01-01

    [GL] O Cancioneiro tradicional Galego: Instrumentos pobres na Escola é un proxecto de intervención socio-educativa centrado na actual situación da música tradicional galega dentro da realidade escolar. Froito dunha profunda investigación documental e curricular a proposta de innovación concrétase na elaboración dun cancioneiro escolar asentado nas melodías e nos instrumentos (instrumentos pobres) propios do noso patrimonio cultural. A finalidade última do traballo é ofrecer aos...

  4. Pregled strategije adhezije na caklinu i dentin

    OpenAIRE

    Azinović, Zoran; Galić, Nada; Lazić, Biserka; Keros, Jadranka; Buković, Dino; Jorgić-Srdjak, Ksenija

    1998-01-01

    U uvodu se ističe važnost kemijskoga predtretmana tvrdih zubnih tkiva tijekom restorativnoga postupka. Adhezijski restorativni postupak modificira temeljna načela preparacije kaviteta i načela prevencije zubnoga karijesa.Adhezijski se postupak početkom pedesetih godina ograničio samo na kemijski tretman caklinskih rubova. Mnoga tadašnja istraživanja bavila su se koncentracijom kiselina i vremenom jetkanja, te ultramikroskopskim izgledom jetkane caklinske površine. Kemijska obrada dentina i ve...

  5. Competências de enfermagem na arritmologia

    OpenAIRE

    Barata, L.

    2012-01-01

    A utilização do conceito de competência aparece pela primeira vez referenciado na escrita de Florence Nightingale no livro Notes on Nursing, em que o termo é usado para referir as qualidades (características) que as estudantes deveriam possuir para serem enfermeiras no final do curso. Na legislação sobre a carreira, no Regulamento para o Exercício Profissional de Enfermagem (1996), o termo competência simboliza o domínio de actuação na prática profissional, associado a uma noção que evoca a e...

  6. SODOBNA DAVČNA UPRAVA IN KADRI

    OpenAIRE

    Kovačič, Matej

    2011-01-01

    Sodobna družba narekuje optimizacijo in stalno prilagajanje vseh delovnih procesov, pogojev dela in delavcev v vsaki organizaciji. Izjeme niso tudi organi v sestavi vlade, ki spadajo v negospodarsko panogo. Davčna uprava ima eno od ključnih nalog v državni upravi, saj skrbi za proračun in financiranje države. Država bo uspešna le ob pogoju, da bo imela učinkovito, sodobno in moderno davčno upravo. Če hoče davčna uprava postati sodobna, mora stalno slediti novim trendom razvoja, prilagajati de...

  7. KVALITETA MESA LUBINA TIJEKOM POHRANE NA LEDU

    OpenAIRE

    Bojanić, Krunoslav; Kozačinski, Lidija; Filipović, Ivana; Zdolec, Nevijo; Njari, Bela

    2009-01-01

    Cilj ovog rada bio je odrediti održivost mesa lubina tijekom njegove pohrane na ledu u trajanju od 12 dana pracenjem senzornih, fizikalno-kemijskih i mikrobioloških parametara kakvoce i higijenske ispravnosti. U tu je svrhu pretraženo 30 lubina 2., 4., 6., 9. i 12. dana pohrane na ledu na 3º C. Senzorna ocjena kvalitete ocijenjena je Quality Index Method testom (QIM) izra!enom za lubina, Dicentrarchus labrax (Icelandic Fisheries Laboratories) i Market testom. Uzorci ri...

  8. VPLIV SODOBNIH MEDIJEV NA GIBALNO AKTIVNOST OTROK

    OpenAIRE

    Hlastan, Alja

    2014-01-01

    Diplomsko delo je teoretično in se nanaša na teoretska spoznanja s področja športa , vzgoje in medijskih komunikacij. Sestavljeno je iz več poglavij, v katerih sta pojma šport in mediji natančno opredeljena in predstavljena skozi čas. Sodobni šport je namreč z leti postal kulturni in družbeni fenomen, predvsem pa produkt medijske publicitete. Poudarek je na njegovi integriteti s predšolsko vzgojo in vplivu medijev na udejstvovanje otrok v športu. Ti vplivi so lahko pozitivni in negativn...

  9. Klimatske promjene i utjecaj na zdravlje

    OpenAIRE

    Zaninović, Ksenija; Gajić-Čapka, Marjana

    2008-01-01

    Povećana koncentracija stakleničkih plinova zbog ljudskih aktivnosti uzrokovala je globalno zatopljenje koje je u proteklom stoljeću bilo najveće u posljednjih 1000 godina. Zatopljenje je zabilježeno i u Hrvatskoj, gdje je temperatura na obali porasla više nego u unutrašnjosti, pri čemu je zatopljenju na obali najviše pridonio porast ljetnih, a u unutrašnjosti zimskih temperatura zraka. Klimatske promjene utječu na zdravlje ljudi, pri čemu se najviše ističe povećana smrtnost za toplinskih val...

  10. VPLIV PARAMETROV NA KARAKTERISTIKE PROCESA VBRIZGAVANJA

    OpenAIRE

    Radeljić, Boštjan

    2011-01-01

    V nalogi je predstavljen mehansko krmiljen sistem za vbrizgavanje goriva s posebnim poudarkom na izboljšanju karakteristik vbrizgavanja. Analizirani so vplivi posameznih parametrov kot so dolžina in notranji premer visokotlačnih cevi tlačilke ter preddvig bata v linijski visokotlačni tlačilki na karakteristiko vbrizgavanja, tlak vbrizgavanja, trajanje in začetek vbrizgavanja. Analiza eksperimenta je pokazala, da imata na karakteristike procesa vbrizgavanja največji vpliv dolžina in no...

  11. ORGANIZACIJA FESTIVALA S POUDARKOM NA FINANCIRANJU

    OpenAIRE

    Puhar, Rene

    2010-01-01

    Na primeru Festivala DokMa je predstavljen procesni način vodenja in upravljanja organizacije s področja kulture. Identificirani so procesi, ki so za organizacijo festivala ključni. V delu so opazovane še organizacije nekaterih drugih vidnih festivalov: Festivala Lent, Festivala Animateka, Festivala Magdalena. V poglavju o financiranju so analizirani potencialni viri financiranja slovenskih festivalov, ob tem pa izpostavljeni nekateri načini za uspešno pridobivanje finančnih sredstev iz naslo...

  12. VARNOST ELEKTRONSKEGA PLAČEVANJA NA INTERNETU

    OpenAIRE

    Zidar, Miha

    2013-01-01

    Vsi uporabniki elektronskega poslovanja se srečujemo s problematiko varnosti te vrste poslovanja. Predvsem sem ciljamo na uporabnike srednjih let in starejše. Lastna raziskava je pokazala, da več kot tri četrtine anketirancev že uporablja elektronska plačilna sredstva, vendar moramo izpostaviti, da je bila povprečna starost anketirancev 27.2 let. Namen diplomskega seminarja je bil seznanitev z alternativami plačevanja na internetu ter analiziranje le-teh glede varnosti ter prijaznosti d...

  13. SPLETNI PORTAL O KAMPIRANJU NA VZHODNEM JADRANU

    OpenAIRE

    Hribar, Matej

    2015-01-01

    Spletni portali ponujajo veliko informacij o počitniških kapacitetah, zato se večina ljudi, ki si želijo letni dopust preživeti v enem izmed kampov, odloča na podlagi le-teh. Obstaja veliko portalov o kampiranju, vendar pa le ti zaradi svoje posplošenosti ne ponujajo zadostno število informacij, ki jih uporabnik potrebuje. Za temo o spletnem portalu o kampiranju smo se odločili, ker smo mnenja, da portali o kampiranju na vzhodnem Jadranu uporabnikom na enem mestu ne nudijo zadostnih inform...

  14. Capsazepine, a synthetic vanilloid that converts the Na,K-ATPase to Na-ATPase.

    Science.gov (United States)

    Mahmmoud, Yasser A

    2008-02-01

    Capsazepine (CPZ), a synthetic capsaicin analogue, inhibits ATP hydrolysis by Na,K-ATPase in the presence but not in the absence of K(+). Studies with purified membranes revealed that CPZ reduced Na(+)-dependent phosphorylation by interference with Na(+) binding from the intracellular side of the membrane. Kinetic analyses showed that CPZ stabilized an enzyme species that constitutively occluded K(+). Low-affinity ATP interaction with the enzyme was strongly reduced after CPZ treatment; in contrast, indirectly measured interaction with ADP was much increased, which suggests that composite regulatory communication with nucleotides takes place during turnover. Studies with lipid vesicles revealed that CPZ reduced ATP-dependent digitoxigenin-sensitive (22)Na(+) influx into K(+)-loaded vesicles only at saturating ATP concentrations. The drug apparently abolishes the regulatory effect of ATP on the pump. Drawing on previous homology modeling studies of Na,K-ATPase to atomic models of sarcoplasmic reticulum Ca-ATPase and on kinetic data, we propose that CPZ uncouples an Na(+) cycle from an Na(+)/K(+) cycle in the pump. The Na(+) cycle possibly involves transport through the recently characterized Na(+)-specific site. A shift to such an uncoupled mode is believed to produce pumps mediating uncoupled Na(+) efflux by modifying the transport stoichiometry of single pump units. PMID:18230728

  15. Dependence of Na-K pump current on internal Na+ in mammalian cardiac myocytes.

    Science.gov (United States)

    Mogul, D J; Singer, D H; Ten Eick, R E

    1990-08-01

    Na-K pump current (Ipump) is a function of the intracellular Na+ concentration [( Na+]i). We examined the quantitative relationship between Ipump and [Na+]i in isolated guinea pig ventricular myocytes under steady-state conditions. [Na+]i was controlled and "clamped" at several selected concentrations using wide-tipped pipette microelectrodes, and membrane current was measured using the whole cell patch voltage-clamp technique. Ipump generated at a holding potential of -40 mV was determined by measuring the change in steady-state holding current before and during exposure to dihydroouabain (1 mM); Ipump was measured at 11 levels of [Na+]i ranging from 0 to 80 mM (n = 63) with only one measurement per cell and normalized to cell capacitance to account for differences between myocytes in sarcolemmal surface area. Ipump exhibited a nonlinear dependence on [Na+]i; a Hill analysis of the relationship yielded a half-maximal [Na+]i for pump stimulation of 43.2 mM and a Hill coefficient of 1.53. An alternative analysis of the experimental data was performed assuming that occupation of three internal binding sites by Na+ is required for enzyme turnover. Regression analysis gave the best fit when only two different binding affinities (KD) are postulated. The values are KD1 = 1 mM, KD2 = KD3 = 29 mM. From the analysis using the latter model, the level of [Na+]i at which Ipump saturated closely approximated the theoretical saturation level calculated from published estimates of pump turnover rate and density. The maximal sensitivity of the Na-K pump to changes in [Na+]i occurs when internal [Na+] is within the range for the normal resting physiological level. PMID:2167023

  16. Erythrocyte 22Na+ influx in hypertension

    Energy Technology Data Exchange (ETDEWEB)

    Shalev, O.; Eaton, J.W.; Ben-Ishay, D.

    1984-01-01

    We assessed 22Na+ uptake by erythrocytes (RBC) from 38 individuals with essential hypertension and 37 healthy controls. All subjects were male, white, non-obese and with normal renal function, obviating sex, race, hormonal, ponderal and renal factors known to influence RBC Na+ handling. The mean +/- sem 22Na+ uptake of the patients was 284 +/- 16 mumole/liter RBC/hour while that of normal controls was 249 +/- 11 mumole/liter RBC/hour; although the difference reached borderline significance, individual values showed considerable overlap. Consequently, in our population, RBC 22Na+ uptake is not a reliable marker for essential hypertension. We believe that previous studies should be reassessed with regard to patients' characteristics and future studies employ rigorous criteria in selection of subjects.

  17. Aerobe zuivering van vergiste varkensdrijfmest na aanzuren

    NARCIS (Netherlands)

    Goossens, W.

    1988-01-01

    Onderzoeksverslag betreffende een vorm van nazuivering, bedoeld om de vluchtige componenten (vetzuren), die na vergisting nog aanwezig zijn, te oxideren. De mest wordt belucht onder toevoeging van zwavelzuur. Het zure milieu voorkomt ammoniakemissie tijdens het beluchten. Bovendien zullen in volgend

  18. Perfil nutricional na artrite reumatoide

    Directory of Open Access Journals (Sweden)

    Rachel Simone Maccarini Zarpellon

    2014-01-01

    Full Text Available Objetivo: Estudar o perfil nutricional de pacientes com artrite reumatoide (AR. Métodos: Estudo transversal observacional de 102 pacientes com AR. Os pacientes foram estudados para dados clínicos, demográficos, sorológicos, atividade de doença e perfil nutricional. Neste último incluiu-se a medida do índice de massa corporal (IMC, relação quadril/cintura, pregas cutâneas bicipitais (PCB e sua adequação; prega cutânea tricipital (PCT e sua adequação e circunferência muscular do braço (CMB e sua adequação. Estudos de associação foram feitos usando os testes de Fisher e qui-quadrado para dados nominais e teste t não pareado e Mann Whitney para dados numéricos. Para cálculo de correlação usou-se o teste de Spearman. Resultado: Na amostra existiam 14/102 homens e 88/102 mulheres com idade média de 52,1 ± 11,5 anos e duração média de doença de 10,6 ± 7,4 anos. A relação cintura/quadril média era de 0,92 ± 0,07. De acordo com IMC, 30,3% tinham peso normal e 65,5% tinham peso acima do normal. De acordo com PCB, 74,5% eram normais e 25,5% tinham depleção; de acordo com a PCT, 83,3% eram normais e 16,7% tinham depleção. Associação de variáveis nutricionais com gênero, fator reumatoide, nódulos e atividade da doença não mostraram diferenças (p = NS exceto, por uma relação cintura/quadril menor em indivíduos com nódulos (p = 0,02 e uma correlação modesta da PCT com a duração de doença (p = 0,02; R = 0,22; 95% IC = 0,01-0,40. Conclusão: Existe uma alta prevalência de sobrepeso e obesidade em artrite reumatoide e uma pequena frequência de depleção muscular.

  19. SVETOVALEC ZA CEPLJENJE NA OPERACIJSKEM SISTEMU ANDROID

    OpenAIRE

    Kralj, Primož

    2012-01-01

    Cepljenje proti boleznim in informiranje o le-teh je pomemben vidik zagotavljanja zdravja na potovanjih pa tudi doma. V diplomskem delu bomo najprej nekoliko osvetlili ozadje operacijskega sistema Android z opisom in zgodovino in nato predstavili pomen informiranja za posameznikovo zdravje. Prikazali bomo izdelavo Android mobilne aplikacije, ki akumulira podatke iz zanesljivih virov in jih prikaže v strnjeni obliki, obenem pa omogoča tudi izčrpnejše informiranje, izdelavo na...

  20. KOMUNICIRANJE Z MLADIMI NA PRIMERU MLADINSKEGA HOTELA

    OpenAIRE

    Praper, Jože

    2010-01-01

    Diplomska naloga obravnava komuniciranje z mladimi na primeru mladinskega hotela, kateremu so odnosi z javnostmi mladih še posebej pomembni. Poudarek je na obravnavi novih elektronskih oz. sodobnih medijev, povezanih z internetom in mobilnimi telefoni. Ugotovitev diplomske naloge je, da delež komuniciranja mladih z novimi mediji raste in da vedno več mladinskih hotelov uporablja nove medije, kot so spletne strani, Facebook, Netlog, RSS, YouTube, Twiter, Flicker, za predstavljanje, promoviranj...

  1. PRIPRAVLJENOST EES NA ELEKTROMOBILNOST V SLOVENIJI

    OpenAIRE

    Peklar, Jožef

    2016-01-01

    Naloga predstavlja trenutno stanje razvitosti elektromobilnosti v Sloveniji, njeno ekonomsko upravičenost ter elektroenergetske zmožnosti sistema za popolno elektrifikacijo osebnega prometa. Namen naloge je opozoriti na energijsko odvisnost Slovenije in na področja v energetiki, v katerih se bo pojavilo največ problemov zaradi uvedbe elektromobilnosti. Podan je tudi finančni izračun uvedbe elektromobilnosti osebnega prometa Slovenije ter dejanske elektroenergetske zmogljivosti mesta Maribor z...

  2. LEDINSKA IN HIŠNA IMENA V SPODNJEM RAZBORJU, ZGORNJEM RAZBORJU IN NA SELAH

    OpenAIRE

    Špegel, Petra

    2012-01-01

    V diplomskem delu z naslovom Ledinska in hišna imena v Spodnjem Razborju, Zgornjem Razborju in na Selah, so zbrana ledinska in hišna imena v izbranih naseljih občine Slovenj Gradec. Na tem območju se govori mežiško narečje, ki spada v koroško narečno skupino. Govor mežiškega narečja pozna le jakostni oziroma dinamični naglas, intonacija je padajoča, vokalni sistem pa je monoftongično-diftongičen. Gradivo je pridobljeno na terenu, od tega so hišna imena najprej prepisana iz Telefonskega imenik...

  3. Elastic Coulomb breakup of $^{34}$Na

    CERN Document Server

    Singh, G; Chatterjee, R

    2016-01-01

    Purpose : The aim of this paper is to study the elastic Coulomb breakup of $^{34}$Na on $^{208}$Pb to give us a core of $^{33}$Na with a neutron and in the process we try and investigate the one neutron separation energy and the ground state configuration of $^{34}$Na. Method : A fully quantum mechanical Coulomb breakup theory within the architecture of post-form finite range distorted wave Born approximation extended to include the effects of deformation is used to research the elastic Coulomb breakup of $^{34}$Na on $^{208}$Pb at 100 MeV/u. The triple differential cross-section calculated for the breakup is integrated over the desired components to find the total cross-section, momentum and angular distributions as well as the average momenta, along with the energy-angular distributions. Results : The total one neutron removal cross-section is calculated to test the possible ground state configurations of $^{34}$Na. The average momentum results along with energy-angular calculations indicate $^{34}$Na to ha...

  4. Capsazepine, a synthetic vanilloid that converts the Na,K-ATPase to Na-ATPase

    OpenAIRE

    Mahmmoud, Yasser A.

    2008-01-01

    Capsazepine (CPZ), a synthetic capsaicin analogue, inhibits ATP hydrolysis by Na,K-ATPase in the presence but not in the absence of K+. Studies with purified membranes revealed that CPZ reduced Na+-dependent phosphorylation by interference with Na+ binding from the intracellular side of the membrane. Kinetic analyses showed that CPZ stabilized an enzyme species that constitutively occluded K+. Low-affinity ATP interaction with the enzyme was strongly reduced after CPZ treatment; in contrast, ...

  5. UTJECAJ KOMUNIKACIJE UPRAVNIH MENADŽERA NA SIGURNOST I ZDRAVLJE NA RADU

    OpenAIRE

    Markič, Mirko; Kolenc, Igor; Miklavčič Šumanski, Martina

    2009-01-01

    SAŽETAK: U menadžerskoj praksi upotrebljava se mnogo preventivnih alata (npr. najbolje prakse, usporedna ocjenjivanja, ocjenjivački modeli itd.) kojima se neprekidno poboljšava stanje na području sigurnosti i zdravlja na radu. Budući da je komuniciranje jedno od ključnih sastavnih dijelova, koji utječu na kulturu sigurnosti i uspješnosti preventivnih djelovanja, zanimalo nas je kako slovenski upravni menadžeri komuniciraju i kako, glede sigurnosti i zdravlja na radu, stupanj komunikacije utje...

  6. Influência da dessilicação de zeólitos na pirólise catalítica do polietileno

    OpenAIRE

    Morais, Inês Machado Sousa de

    2014-01-01

    Neste trabalho foram realizadas análises à degradação térmica e degradação catalítica de polietileno de alta densidade (PEAD) e de resíduos plásticos de cabos eléctricos, utilizando técnicas de Termogravimetria (TGA) e Calorimetria Diferencial de Varrimento (DSC). Analisaram-se amostras de polietileno de alta densidade puro e do mesmo polímero com vários catalisadores. Analisaram-se também amostras de resíduos plásticos de cabos eléctricos (mistura de polietileno, polipropileno e outros co...

  7. Elastic Coulomb breakup of 34Na

    Science.gov (United States)

    Singh, G.; Shubhchintak, Chatterjee, R.

    2016-08-01

    Background: 34Na is conjectured to play an important role in the production of seed nuclei in the alternate r -process paths involving light neutron rich nuclei very near the β -stability line, and as such, it is important to know its ground state properties and structure to calculate rates of the reactions it might be involved in, in the stellar plasma. Found in the region of `island of inversion', its ground state might not be in agreement with normal shell model predictions. Purpose: The aim of this paper is to study the elastic Coulomb breakup of 34Na on 208Pb to give us a core of 33Na with a neutron and in the process we try and investigate the one neutron separation energy and the ground state configuration of 34Na. Method: A fully quantum mechanical Coulomb breakup theory within the architecture of post-form finite range distorted wave Born approximation extended to include the effects of deformation is used to research the elastic Coulomb breakup of 34Na on 208Pb at 100 MeV/u. The triple differential cross section calculated for the breakup is integrated over the desired components to find the total cross-section, momentum, and angular distributions as well as the average momenta, along with the energy-angular distributions. Results: The total one neutron removal cross section is calculated to test the possible ground state configurations of 34Na. The average momentum results along with energy-angular calculations indicate 34Na to have a halo structure. The parallel momentum distributions with narrow full widths at half-maxima signify the same. Conclusion: We have attempted to analyze the possible ground state configurations of 34Na and in congruity with the patterns in the `island of inversion' conclude that even without deformation, 34Na should be a neutron halo with a predominant contribution to its ground state most probably coming from 33Na(3 /2+)⊗ 2 p3 /2ν configuration. We also surmise that it would certainly be useful and rewarding to test our

  8. O Passeio Público do Rio de Janeiro na Literatura, na Pintura e na Fotografia do Século XIX

    Directory of Open Access Journals (Sweden)

    Solange de Aragão

    2012-06-01

    Full Text Available Este artigo tem como objetivo geral e mais amplo chamar a atenção dos pesquisadores para a importância da literatura, da pintura e da fotografia como fontes documentais para a construção da História do Paisagismo no Brasil por meio de um estudo de caso muito particular: o Passeio Público do Rio de Janeiro no século XIX. São objetivos específicos apresentar e analisar o modo como esse espaço livre público aparece na literatura, na pintura e na fotografia desse período, considerando suas transformações paisagísticas.

  9. Kontrola točke staljivanja na aglomeracijskoj traci

    OpenAIRE

    J. Terpák; Dorčák, L'.; I. Koštial; L. Pivka

    2005-01-01

    U radu se opisuje kontrola točke staljivanja sintera na aglomeracijskoj traci. Ta se kontrola zasniva na matematičkom modeliranju aglomeracijskog procesa. Matematički modeli i algoritmi su izvedeni iz temeljnih modela fizičkih i kemijskih procesa na aglomeracijskoj traci i osnivaju se na izravno i neizravno izmjerenim količinama na aglomeracijskoj traci. Kontrola kretanja naprijed se zasniva na količini plina izgorenog u potpalnoj peći i na količini i sastavu sirove mješavine. Ta veličina se ...

  10. PRAVNI OKVIR PRIREJANJA IGER NA SREČO V EU

    OpenAIRE

    Mihalič, Emil

    2010-01-01

    Osrednja tema diplomske naloge je pravna ureditev oziroma pravni okvir organiziranja iger na srečo v okviru Evropske unije in problematika čezmejnega vpliva le-teh ter vpliv prava EU na potrebno uskladitev nacionalne zakonodaje iger na srečo v Republiki Sloveniji s pravom EU. Raznolikost nacionalnih ureditev področja iger na srečo kaže na to, da bo morebitna harmonizacija področja iger na srečo vse prej kot enostavno delo. Marsikje se za na videz transparentnimi in legitimnimi razlogi ome...

  11. VPLIV CENE NA ZADOVOLJSTVO IN ZVESTOBO UPORABNIKOV TELEKOMUNIKACIJSKIH STORITEV

    OpenAIRE

    Majcen, Mateja

    2016-01-01

    Cena izdelka ali storitve, ki jo plača uporabnik, ima pomemben vpliv na zadovoljstvo ali nezadovoljstvo uporabnika z uporabo tega izdelka ali storitve in posledično na zadovoljstvo do podjetja. Glede na to, da se različni avtorji strinjajo in to tudi dokazujejo z raziskavami, zadovoljstvo nedvoumno vpliva na zvestobo uporabnika, zvestoba pa na dolgoročno uspešnost podjetja, smo v delu ugotavljali, kako sama cena storitve vpliva na zadovoljstvo in kako posredno preko zadovoljstva vpliva na zve...

  12. Summer sudden Na number density enhancements measured with the ALOMAR Weber Na Lidar

    Directory of Open Access Journals (Sweden)

    D. Heinrich

    2008-05-01

    Full Text Available We present summer Na-densities and atmospheric temperatures measured 80 to 110 km above the Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR. The Weber Na Lidar is part of ALOMAR, located at 69° N in Norway, 150 km north of the Arctic Circle. The sun does not set here during the summer months, and measurements require a narrowband Faraday Anomalous Dispersion Optical Filter (FADOF.

    We discuss an observed sudden enhancement in the Na number density around 22:00 UT on 1 to 2 June 2006. We compare this observation with previous summer measurements and find a frequent appearance of Na number density enhancements near local midnight. We describe the time of appearance, the altitude distribution, the duration and the strength of these enhancements and compare them to winter observations. We investigate possible formation mechanisms and, as others before, we find a strong link between these Na number density enhancements and sporadic E layers.

  13. Metallic Na formation in NaCl crystals with irradiation of electron or vacuum ultraviolet photon

    Energy Technology Data Exchange (ETDEWEB)

    Owaki, Shigehiro [Osaka Prefecture Univ., Sakai, Osaka (Japan). Coll. of Integrated Arts and Sciences; Koyama, Shigeko; Takahashi, Masao; Kamada, Masao; Suzuki, Ryouichi

    1997-03-01

    Metallic Na was formed in NaCl single crystals with irradiation of a variety of radiation sources and analyzed the physical states with several methods. In the case of irradiation of 21 MeV electron pulses to the crystal blocks, the optical absorption and lifetime measurement of positron annihilation indicated appearance of Na clusters inside. Radiation effects of electron beam of 30 keV to the crystals in vacuum showed the appearance of not only metallic Na but atomic one during irradiation with Auger electron spectroscopy. Intense photon fluxes in vacuum ultraviolet region of synchrotron radiation were used as another source and an analyzing method of ultraviolet photoelectron spectroscopy. The results showed the metallic Na layered so thick that bulk plasmon can exist. (author)

  14. Recent results from NA61/SHINE

    CERN Document Server

    Kowalski, Seweryn

    2015-01-01

    The aim of the NA61/SHINE ion programme is to explore the QCD phase diagram within the range of thermodynamical variables accessible by the SPS. Moreover the experiment provides precision hadron production measurements to improve computation of neutrino fluxes in neutrino oscillation experiments and for improving air shower simulations of cosmic-ray experiments. The main physics goals of the NA61/SHINE ion programme are the study of the properties of the onset of deconfinement and the search for signatures of the critical point of strongly interacting matter. These goals are pursued by performing an energy (beam momentum 13A – 158 A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This paper reviews the status and results of the NA61/SHINE experiment.

  15. UTJECAJ GMO NA EKOLOŠKU POLJOPRIVREDU

    OpenAIRE

    Fagan, John

    2008-01-01

    Gotovo svi znanstvenici se slažu da su danas uobičajene metode za ugradnju novog gena u genom biljke putem genetičkog inženjerstva (genetičke modifikacije): (1) neprecizne i slučajne, (2) pa je njihov utjecaj na biološke funkcije biljke nepredvidiv, (3) a neželjeni učinci GMO na zdravlje konzumenta i na okoliš mogući. Korištenje GMO u ekološkoj poljoprivredi je zabranjeno, stoga potrošač vjeruje da oznaka “ekološki” zakonski štiti od prisustva GMO u hrani. Međutim, povećano korištenje GMO u k...

  16. Recent results from NA61/SHINE

    CERN Document Server

    Puławski, Szymon

    2015-01-01

    The main physics goals of the NA61/SHINE programme on strong interactions are the study of the properties of the onset of deconfinement and the search for signatures of the critical point of strongly interacting matter. These goals are pursued by performing an energy (beam momentum 13A -158A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This publication reviews results and plans of NA61/SHINE. In particular, recent inclusive spectra and new results on fluctuations and correlations of identified hadrons in inelastic p+p and centrality selected Be+Be interactions at the SPS energies are presented. The energy dependence of quantities inspired by the Statistical Model of the Early Stage (kink, horn and step) show unexpected behavior in p+p collisions. The NA61/SHINE results are compared with the corresponding data of other experiments and model predictions.

  17. Eletrencefalograma na síndrome parkinsoniana

    Directory of Open Access Journals (Sweden)

    José Geraldo Camargo Lima

    1973-09-01

    Full Text Available Foram estudados os eletrencefalogramas de 50 pacientes parkinsonianos livres de qualquer antecedente convulsivo, sendo registrados traçados anormais em 40% dos casos. A incidência de traçados anormais foi maior na síndrome parkinsoniana bilateral do que na unilateral (52% e 25%, respectivamente. Entre as anormalidades assinaladas foram as paroxísticas as mais freqüentes (65% dos casos, caracterizando-se predominantemente por surtos de ondas teta. O registro de anormalidades paroxísticas do tipo irritativo encontrado em três casos é salientado. Alterações da atividade de base foram assinaladas em 35% dos pacientes. A idade dos pacientes não parece ter tido importante papel na gênese das anormalidades eletrencefalográficas.

  18. Tecnologia simplificada na enfermagem materno infantil

    Directory of Open Access Journals (Sweden)

    Selma Campestrini

    1991-09-01

    Full Text Available A autora apresenta três modelos de tecnologia simplificada da enfermagem materno infantil: o equipamento didático SEIO COBAIA para treinar exercícios e massagens da mama e mamilo; a peça indumentária SUPRETRAUMA - sutiã preventivo de traumatismo mamilar - usado por gestantes; e, a técnica para reverter mamilo umbilicado durante o puerperio imediato. Além de corroborar na promoção do aleitamento materno e na prevenção de desmame precoce, demonstra a possibilidade da enfermagem relacionar o saber teórico-científico com o saber tecnico-prático, na saúde da mulher e da criança, com tecnologia adequada às necessidades, à compreensão e ao bem estar da população.

  19. Diffusion of propylene adsorbed in Na-Y and Na-ZSM5 zeolites: Neutron scattering and FTIR studies

    Indian Academy of Sciences (India)

    S Gautam; A K Tripathi; V S Kamble; S Mitra; R Mukhopadhyay

    2008-11-01

    Here we report the quasielastic neutron scattering and FTIR studies on the dynamics of propylene adsorbed in Na-Y and Na-ZSM5 zeolites. QENS data show that although the mechanism of translational motion of propylene is jump diffusion in both the cases of Na-Y and Na-ZSM5 zeolites, the diffusivity is affected by the host size and is hindered in the case of Na-ZSM5. FTIR studies showed that guest–host interaction in Na-ZSM5 is stronger than that in Na-Y zeolite corroborating the QENS results.

  20. Concentration dependence of Li+/Na+ diffusion in manganese hexacyanoferrates

    Science.gov (United States)

    Takachi, Masamitsu; Fukuzumi, Yuya; Moritomo, Yutaka

    2016-06-01

    Manganese hexacyanoferrates (Mn-HCFs) with a jungle-gym-type structure are promising cathode materials for Li+/Na+ secondary batteries (LIBs/SIBs). Here, we investigated the diffusion constants D Li/D Na of Li+/Na+ against the Li+/Na+ concentration x Na/x Li and temperature (T) of A 1.32Mn[Fe(CN)6]0.833.6H2O (A = Li and Na). We evaluated the activation energy E\\text{a}\\text{Li}/E\\text{a}\\text{Na} of D Li/D Na against x Na/x Li. We found that E\\text{a}\\text{Na} steeply increases with x Na from 0.41 eV at x Na = 0.69 to 0.7 eV at 1.1. The increase in E\\text{a}\\text{Na} is ascribed to the occupancy effect of the Na+ site. The increase in E\\text{a}\\text{Li} is suppressed, probably because the number of Li+ sites is three times that of Na+ sites.

  1. Crystal structure of a Na+-bound Na+,K+-ATPase preceding the E1P state.

    Science.gov (United States)

    Kanai, Ryuta; Ogawa, Haruo; Vilsen, Bente; Cornelius, Flemming; Toyoshima, Chikashi

    2013-10-10

    Na(+),K(+)-ATPase pumps three Na(+) ions out of cells in exchange for two K(+) taken up from the extracellular medium per ATP molecule hydrolysed, thereby establishing Na(+) and K(+) gradients across the membrane in all animal cells. These ion gradients are used in many fundamental processes, notably excitation of nerve cells. Here we describe 2.8 Å-resolution crystal structures of this ATPase from pig kidney with bound Na(+), ADP and aluminium fluoride, a stable phosphate analogue, with and without oligomycin that promotes Na(+) occlusion. These crystal structures represent a transition state preceding the phosphorylated intermediate (E1P) in which three Na(+) ions are occluded. Details of the Na(+)-binding sites show how this ATPase functions as a Na(+)-specific pump, rejecting K(+) and Ca(2+), even though its affinity for Na(+) is low (millimolar dissociation constant). A mechanism for sequential, cooperative Na(+) binding can now be formulated in atomic detail. PMID:24089211

  2. NOVOSTI NA PODROČJU HIPOTEKARNEGA PRAVA

    OpenAIRE

    Kotnik, Nuša

    2012-01-01

    Hipoteka v našem slovenskem pravnem sistemu poznana že dolgo časa in predstavlja najbolj razširjen institut stvarnopravnega zavarovanja kreditnih pogodb oziroma služi za zavarovanje denarnih terjatev upnika do zastavitelja na nepremičnini. Nepremičnine so zaradi razmeroma visoke in stabilne vrednosti v praksi pomembni objekti stvarnopravnih zavarovanj. Institut hipoteke v materialnem smislu ureja Stvarnopravni zakonik (SPZ). Hipoteka nudi močno jamstvo hipotekarnemu upniku in ga pooblašča, d...

  3. HIPOTEKA - ZASTAVNA PRAVICA NA NEPREMIČNINI

    OpenAIRE

    Radislav, Anja

    2010-01-01

    Zastavna pravica na nepremičninah oziroma hipoteka je kot stvarna pravica celovito urejena v Stvarnopravnem zakoniku, v delu, ki ureja zastavne pravice. Zastavna pravica je splošno urejena v 128. členu SPZ, ki jo določa kot stvarno pravico na točno določeni tuji stvari ali pravici, ki zastavnemu upniku daje upravičenje, da se zaradi neplačila zavarovane terjatve ob njeni zapadlosti poplača skupaj z obrestmi in stroški iz vrednosti zastavljene nepremičnine pred vsemi drugimi upniki zastavitelj...

  4. REDNI LETNI RAZGOVORI NA UKC MARIBOR

    OpenAIRE

    Pliberšek, Darja

    2016-01-01

    V diplomskem delu z naslovom »Redni letni razgovori v Univerzitetnem kliničnem centru Maribor« je prikazano trenutno stanje sistema izvajanja rednih letnih razgovorov in njihova praktična učinkovitost. Diplomsko delo je sestavljeno iz teoretičnega in empiričnega dela. V prvem, teoretičnem delu, se seznanimo z opredelitvijo rednega letnega razgovora, predstavljen je pomen rednih letnih razgovorov na ravni posameznika in organizacije ter nameni in cilji izvedbe rednih letnih razgovorov. Opi...

  5. TRPINČENJE (MOBBING) NA DELOVNEM MESTU

    OpenAIRE

    Šiftar, Maja

    2010-01-01

    Diplomsko delo obravnava problem mobbinga na delovnem mestu in vsebuje poleg uvoda še devet poglavij. V drugem poglavju je pojasnjen izvor besede mobbing in njen pomen ter omenjena oseba, ki je mobbing prenesla v delovno okolje. Slovenija je od leta 2004 polnopravna članica Evropske unije in posledica tega je, da pravna ureditev mobbinga v Sloveniji upošteva akte, ki se nanašajo na mednarodne akte, ki določajo diskriminacijo zaposlenih v zvezi z mobbingom. Tako so v nadaljevanju navedeni in o...

  6. DISKRIMINACIJA IN MOBBING NA DELOVNEM MESTU

    OpenAIRE

    Repolusk, Nina

    2011-01-01

    Z globalizacijo, vse hitrejšim tempom življenja in s tem povezanim stresom, se na delovnih mestih vse več pojavljata pojava diskriminacija in mobbing. Pojava sta zelo podobna, vendar pa med njima obstajajo pomembne razlike. Diskriminacija je neupravičeno postavljanje drugega v slabši položaj glede na katero izmed osebnih okoliščin (spol, spolna usmerjenost, starost, rasa, vera ali prepričanje, invalidnost …). Da lahko govorimo, da je delavec diskriminiran, je dovolj, da se to zgodi enkrat, me...

  7. MLADI KAO RIZIČNA SKUPINA

    OpenAIRE

    Pavićević, Olivera

    2015-01-01

    U radu je analiziran odnos koncepta rizika i mladosti kao životnog doba koje rizik uključuje kao inherentno svojstvo. Proces sazrijevanja podrazumijeva rizik, a on je na različite načine u odnosu s društvenim i kulturnim konceptom rizika koji je svojstven, kako stvarnosti kasnog kapitalizma, tako i političkim i ideološkim ekspertizma koje teže njime upravljati. Diskurs rizika često se pojavljuje u javnosti kao negativan, uznemirujući i opominjući stav prema mladima označavajući ih kao kategor...

  8. E-GRADIVA NA PRIMERU OBRAVNAVE GLAGOLA

    OpenAIRE

    Kajtna, Tjaša

    2013-01-01

    Sodobne tehnologije so korenito spremenile današnji način življenja. Tako je tudi z izobraževanjem. Vedno več učiteljev ob klasičnih metodah poučevanja uporablja tudi nove pristope, ki so povezani s sodobnimi tehnologijami. V diplomskem delu je opredeljeno e-izobraževanje, predstavljene so nove tehnologije, ki se pojavljajo v povezavi z le-tem. V nadaljevanju sledi teoretična obravnava e-gradiv, ki ob podpori informacijsko komunikacijskih tehnologij predstavljajo temelj e-izobraževanja. ...

  9. UPORABA TEHNOLOGIJE VOIP NA MOBILNIH NAPRAVAH SYMBIAN

    OpenAIRE

    Uršič, Tine

    2013-01-01

    V sklopu diplomskega dela smo razvili aplikacijo, katere cilj je nižanje stroškov klicev s pomočjo tehnologije VoIP. Ta za komunikacijo uporablja protokol IP in zaobide potrebo po navadnih in dražjih GSM klicih. V času načrtovanja aplikacije je bilo okolje Symbian najbolj razširjena mobilna platforma za dovolj zmogljive, t.i. »pametne telefone«, ki lahko poganjajo VoIP aplikacije. Izbrali smo skupek knjižnic, poimenovanih Qt, ki omogočajo enostavno prenosljivost na druge platforme. Podr...

  10. Znanstveni pogledi na spreobrnitev v alternativne religije

    OpenAIRE

    Volarič, Ariana

    2014-01-01

    Problematika pojasnjevanja spreobrnitve v alternativne religije je v evro-ameriški znanosti prisotna že več kot eno stoletje. V drugi polovici 20. stoletja je s pojavom modela pranja možganov spreobrnitev postala celo kontroverzna populistična tema. Zadnji dve desetletji, ko model pranja možganov zaradi neustrezne argumentacije izgublja na veljavi, je prevladujoči model postal procesualen model. V Sloveniji se srečujemo v glavnem s nedodelanimi aplikacijami v znanosti opuščenega modela pranja...

  11. Alberto Sampaio na arqueologia do seu tempo

    OpenAIRE

    Lemos, Francisco Sande

    1992-01-01

    Pela segunda vez, no espaço de um ano, temos a grata oportunidade de colaborar com a Sociedade Martins Sarmento, em actos de homenagem a personagens ilustres que deixaram um sulco profundo nos labores da arqueologia. Em Fevereiro do corrente ano (1991), numa cerimónia realizada na sede da Sociedade, evocamos Martins Sarmento e a sua dimensão como investigador europeu. Na presente sessão recordamos um outro investigador, nascido em Guimarães, Alberto Sampaio, que pela sua vida e obra foi um ho...

  12. Utjecaj granulometrijskog sastava na svojstva procjednog betona

    OpenAIRE

    Mrakovčić, Silvija; Čeh, Nina; Jugovac, Vedrana

    2014-01-01

    U radu su eksperimentalno određena svojstva svježeg i očvrsnulog procjednog betona. Analizirana je zavisnost tlačne čvrstoće, vlačne čvrstoće savijanjem te koeficijenta protočnosti o granulometrijskom sastavu agregata. Budući da ne postoji propisani način određivanja protjecanja vode kroz procjedni beton, ispitivanje je provedeno sukladno poznatim metodama, ali s pomoću samostalno izrađenih pomagala. Na uzorcima s diskontinuiranom granulometrijskom krivuljom, gdje udio frakcije pijeska 0-2 mm...

  13. O problema do conhecimento verdadeiro na epidemiologia

    Directory of Open Access Journals (Sweden)

    Ayres José Ricardo de Carvalho Mesquita

    1992-01-01

    Full Text Available São examinadas as bases filosóficas da validação do conhecimento científico, com o intuito de estabelecer uma visão crítica a respeito da adoção das proposições de Popper na epidemiologia. Ressalta-se o caráter conservador que resulta das limitações técnicas implicadas na sua adoção, não obstante o evidente aumento da racionalidade e da criatividade heurística que propicia.

  14. OCENA KAKOVOSTI VODIJ TIMA NA INTENZIVNEM ODDELKU

    OpenAIRE

    Podsedenšek, Darja

    2016-01-01

    Teoretična izhodišča: Za najboljši možni izid zdravljenja življenjsko ogroženih pacientov je potreben tim, v katerem so vsi zaposleni visoko strokovno usposobljeni, vodje pa odlikujejo sposobnosti načrtovanja, organiziranja in nadzorovanja dela, pa tudi motiviranja, komuniciranja in konstruktivnega reševanja problemov. Hkrati morajo biti tudi zanesljivi, primerno čustveno inteligentni in imeti razvito empatijo, saj naj bi bili vzor ostalim zaposlenim. Namen magistrskega dela je bil ugotoviti...

  15. AVTOMATIZIRANE TRGOVALNE STRATEGIJE NA FOREX TRGU

    OpenAIRE

    Kresnik, Jan

    2014-01-01

    Trgovanja brez točno določene strategije skoraj ni mogoče objektivno oceniti. Vsak trgovalec ima svojo predstavo o trgu in lahko iz enakih informacij naredi drugačne zaključke kot nek drug trgovalec. Zaradi tega je danes vse bolj v veljavi trgovanje na osnovi algoritmov, ki vedno sprejmejo enako odločitev, in sicer glede na parametre, ki jih trgovalec želi vstaviti v strategijo. Prav tako lahko rezultate ene strategije primerjamo z rezultati druge strategije, saj vemo, da je končni rezultat p...

  16. Karijesprotektivno djelovanje Fluonatrila na zube prve denticije

    OpenAIRE

    Percač, Helena; Ondrušek, V.; Rajić, Zdravko

    1986-01-01

    Ovo istraživanje odnosi se na 210 djece, stare 4 i 5 godina iz Međimurja. Izvršeno je u Medicinskom centru Čakovec. Endogena fluoridacija provedena je kod 141 djeteta, a 59 djece činilo je kontrolnu skupinu. Za endogenu fluoridaciju odabran je preparat »Fluonatril«, tvornice »Belupo«. Preparat se primjenjivao u trudnica od četvrtog mjeseca trudnoće pa do kraja dojenja i u djece od šestog mjeseca kontinuirano svakodnevno. Sistematski pregledi s registracijom nalaza na zubima izvršeni su s 4 i ...

  17. Biomarcadores na saliva - presente e futuro

    OpenAIRE

    Fonseca, Jorge Filipe Raposo

    2014-01-01

    A deteção de biomarcadores na saliva, proteínas que estão associadas a fenótipos de patologias específicas, apresenta-se como uma área de intervenção diagnóstica pouco estudada na atualidade. Foi objetivo deste estudo de acordo com os dados de proteómica/ estudos dirigidos depositados no OralCard referentes a patologias orais e sistémicas: - Realizar uma análise crítica dos biomarcadores até agora propostos; - Identificar que proteínas podem vir a constituir potenciais no...

  18. UPORABA TEHNOLOGIJE XQUERY NA PRIMERU ISKALNIKA AMISTV

    OpenAIRE

    Počkar, Martin

    2013-01-01

    V diplomskem delu je predstavljena uporaba povpraševalnega jezika XQuery na primeru iskalnika po digitalnem televizijskem sporedu (angl. EPG) na storitvi AmisTV 1.5. Skozi delo so predstavljeni koncepti jezika XQuery in orodja za delo s tem jezikom. Delo predstavi delovanje produkcijskega iskalnika AmisTV 1.5, ki deluje z uporabo relacijske podatkovne baze in jezika SQL, ter praktično rešitev iskalnika z uporabo jezika XQuery. Obe rešitvi sta v diplomskem delu primerjani s statistiko, pridobl...

  19. Study on Na layer response to geomagnetic activities based on Odin/OSIRIS Na density data

    Science.gov (United States)

    Tsuda, Takuo; Nakamura, Takuji; Hedin, Jonas; Gumbel, Jorg; Hosokawa, Keisuke; Ejiri, Mitsumu K.; Nishiyama, Takanori; Takahashi, Toru

    2016-07-01

    The Na layer is normally distributed from 80 to 110 km, and the height range is corresponding to the ionospheric D and E region. In the polar region, the energetic particles precipitating from the magnetosphere can often penetrate into the E region and even into the D region. Thus, the influence of the energetic particles to the Na layer is one of interests in the aspect of the atmospheric composition change accompanied with the auroral activity. There are several previous studies in this issue. For example, recently, we have reported an initial result on a clear relationship between the electron density increase (due to the energetic particles) and the Na density decrease from observational data sets obtained by Na lidar, EISCAT VHF radar, and optical instruments at Tromsoe, Norway on 24-25 January 2012. However, all of the previous studies had been carried out based on case studies by ground-based lidar observations. In this study, we have performed, for the first time, statistical analysis using Na density data from 2004 to 2009 obtained with the Optical Spectrograph and InfraRed Imager System (OSIRIS) onboard Odin satellite. In the presentation, we will show relationship between the Na density and geomagnetic activities, and its latitudinal variation. Based on these results, the Na layer response to the energetic particles will be discussed.

  20. The role of Na/+/ in transport processes of bacterial membranes

    Science.gov (United States)

    Lanyi, J. K.

    1979-01-01

    Until recently it was generally held that transport in bacteria was linked exclusively to proton circulation, in contrast to most eucaryotic systems, which depended on Na(+) circulation. The present review is intended to trace recent developments which have led to the discarding of this idea. The discussion covers transport of Na(+) and other cations, effects of Na(+) and Na(+) gradients on metabolite transport, properties of Na(+)-dependent transport carriers, and evolutionary considerations of Na(+) transport. It is now apparent that the transport of Na(+) is an important part of energy metabolism in bacteria, and that Na(+) gradients as well as H(+) gradients are used in these systems for the conservation and transmission of energy. Two hypotheses are proposed to explain the evolution of Na/K systems, and it is presently difficult to decide between them.

  1. VPLIV KULTURE NA MEDNARODNO POSLOVANJE NA PRIMERU JAPONSKE, BRAZILIJE IN RUSIJE

    OpenAIRE

    Radej, Helena

    2011-01-01

    Kultura ima močan vpliv na mednarodno poslovanje, ima vedno večji vpliv na medkulturna pogajanja in velja za spremenljivko, ki ne sme biti zanemarjena. Kultura je celota, ki vključuje znanje, prepričanja, vrednote, moralo, zakone, običaje in je način skupnega življenja vsakega naroda. Poznavanje kulture je ključ, brez katerega podjetniki ne morejo odklepati vrat v mednarodno poslovnem okolju. V diplomski nalogi smo opredelili pojem kulture in predstavili njene značilnosti in sestavine. Op...

  2. Vpliv neprimerne toplotne obdelave po varjenju na trdoto TVP jekla odpornega na lezenje

    OpenAIRE

    Senovršnik, Klemen

    2015-01-01

    Glavni cilj diplomske naloge je bilo preučiti vpliv nezadostne in previsoke toplotne obdelave TVP na trdoto za jekla za povišane temperature. Najprej so predstavljena sodobna jekla za povišane temperature ter toplotna obdelava vzorcev s simulirano mikrostrukturo. V nadaljevanju smo izdelali vzorce TVP na simulatorju termičnega cikla Smitweld in izvedli toplotno obdelavo na temperaturi, višji in nižji od priporočene (760°C). Sledila je še analiza mikrostrukture in meritev trdote TVP. Prikazali...

  3. INTOLERANCIJA NA HISTAMIN – KOJE SU MOGUĆE POSLJEDICE NA KOŽI?

    OpenAIRE

    Lugović-Mihić, Liborija; ŠEŠERKO, ANA; DUVANČIĆ, TOMISLAV; Šitum, Mirna; Mihić, Josip

    2013-01-01

    Iako se intolerancija na histamin (Histamine Intolerance, HIT) ne javlja često, posljedice mogu biti teške. Intolerancija na hranu je nealergijska preosjetljivost na hranu koja ne uključuje imunološki sustav iako su simptomi slični onima kod alergijskih reakcija posredovanih IgE-om. Čini se da HIT nastaje oštećenjem aktivnosti diaminoksidaze (DAO) zbog gastrointestinalnih bolesti ili inhibicijom DAO, a u dijelu bolesnika dokazana je i genetska predispozicija. Unos hrane bogate histaminom te a...

  4. VPLIV AVTOMOBILSKE INDUSTRIJE NA DRUŽBENOGOSPODARSKE SPREMEMBE NA ČEŠKEM IN V SLOVENIJI

    OpenAIRE

    Bogovič, Amadej

    2016-01-01

    Potreba po mobilnosti in učinkovitem prevoznem sredstvu je privedla do izuma avtomobila ter posledično do nastanka in razvoja avtomobilske industrije. Ta velja danes v številnih evropskih državah za eno izmed ključnih gospodarskih panog, ki ima številne družbene in gospodarske posledice v okolju, v katerem deluje. Magistrsko delo se osredotoča na vpliv avtomobilske industrije na družbenogospodarske spremembe na Češkem in v Sloveniji. Zaradi lažjega razumevanja celotnega poteka naloge ...

  5. TRGOVANJE Z VREDNOSTNIMI PAPIRJI NA PODLAGI TEHNIČNE ANALIZE - NA PRIMERU SOLARNEGA SEKTORJA

    OpenAIRE

    Repolusk, Miha

    2012-01-01

    Diplomsko delo je sestavljeno iz teoretičnega in praktičnega dela. V uvodu je opredeljeno področje, ki je predmet raziskave, namen in cilji ter osnovne trditve ter predpostavke. V poglavju 2 smo se predvsem osredotočili na zgodovino in nastanek tehnične analize, prav tako smo izpostavili prednosti le te. Pomembne so tri predpostavke na katerih temelji tehnična analiza: prva predpostavka je, da tečaj vrednostnega papirja v vsakem trenutku odseva vse potencialne vplive nanj. Druga predpo...

  6. Fitoterápicos na odontologia: estudo etnobotânico na cidade de Manaus

    OpenAIRE

    S. S. Evangelista; F.C. Sampaio; R. C. Parente; M. F. C. L. Bandeira

    2013-01-01

    O reconhecimento oficial da fitoterapia na odontologia no Brasil veio acompanhado de diversas lacunas na pesquisa científica e na utilização de plantas medicinais, especificamente para espécies vegetais com aplicação nas doenças da cavidade oral. O estado do Amazonas, especificamente a cidade de Manaus, não possui um diagnóstico da aplicabilidade de plantas medicinais nos serviços de atenção Odontológica. Esse estudo propôs realizar um estudo do tipo quali-quantitativo, descritivo e explorató...

  7. NA49: lead-lead collision

    CERN Document Server

    1996-01-01

    This is an image of an actual lead ion collision taken from tracking detectors on the NA49 experiment, part of the heavy ion project at CERN. These collisions produce a very complicated array of hadrons as the heavy ions break up. It is hoped that one of these collisions will eventually create a new state of matter known as quark-gluon plasma.

  8. Os embrechados na arte portuguesa dos jardins

    OpenAIRE

    Albergaria, Isabel Soares de

    1997-01-01

    Do francês "brèche" que significa fissura, fenda, ruína ou sulco, a palavra embrechado não tem equivalência noutras línguas, definindo igualmente um tipo decorativo muito usual e, de certa forma, único nos jardins portugueses a partir do século XVII. [...

  9. The origin of the Na-Dene

    OpenAIRE

    Ruhlen, Merritt

    1998-01-01

    Linguistic evidence indicates that the Yeniseian family of languages, spoken in central Siberia, is most closely related to the Na-Dene family of languages spoken, for the most part, in northwestern North America. This hypothesis locates the source of one of the three migrations responsible for the peopling of the Americas.

  10. Categoria de gênero na enfermagem

    Directory of Open Access Journals (Sweden)

    Alcione Leite da Silva

    1999-03-01

    Full Text Available Este estudo teve por objetivo analisar as categorias de gênero, a partir de periódicos sobre estudo de gênero na enfermagem brasileira. Usando uma abordagem exploratória, analisamos os artigos na área, publicados em dez periódicos nacionais de enfermagem, no período de 1955 a 1997/1. Com base na análise dos discursos, as categorias centrais para as quais convergiram as atenções das/os autoras/es foram: gênero e determinantes históricos e sociais no desenvolvimento da profissão de enfermagem, gênero e trabalho, gênero e saúde, gênero e educação e gênero e feminismo. Outras perspectivas importantes, menos enfatizadas, mas emergentes na literatura de enfermagem foram: gênero e cuidado, gênero e família, gênero e violência.

  11. Habitus professoral na sala de aula virtual

    Directory of Open Access Journals (Sweden)

    Alexandre Marinho Pimenta

    2014-09-01

    Full Text Available Entendendo que a indiferença na ação pedagógica contribui para a reprodução das desigualdades no sistema de ensino, o presente artigo busca captar, a partir de entrevistas semiestruturadas, traços do habitus de professores supervisores de disciplinas do curso de Licenciatura em Pedagogia na modalidade a distância na Universidade de Brasília - UnB no âmbito do Sistema Universidade Aberta do Brasil - UAB. As orientações metodológicas de Bourdieu (2007 foram um dos elementos orientadores na análise das entrevistas, considerando ainda o uso heurístico do conceito de habitus. Conclui-se que o habitus professoral envolve esforços voluntários em busca de uma ação pedagógica diferenciada. No entanto, ele é ambíguo e condescendente frente aos limites do modelo de EaD no âmbito da UAB. Ao fim, os dados analisados permitem fornecer elementos para reorientação político-pedagógica que vise a um novo modelo de EaD nacional.

  12. Concentratie gewasbeschermingsmiddelen na verhitting dompelbad bloembollen

    NARCIS (Netherlands)

    Bulle, A.A.E.; Lans, van der A.M.; Aanholt, van J.T.M.

    2014-01-01

    De meest gebruikte methode van ontsmetting van bloembollen en –knollen is een dompeling in een mix van fungiciden. In het proces van bolontsmetting worden partijen bollen na elkaar ontsmet in hetzelfde dompelbad. Met een partij bollen kan een dompelbad behoorlijk vervuild raken met bijvoorbeeld (ste

  13. NA48: Wiring up for Change

    CERN Multimedia

    2001-01-01

    The NA48 Collaboration is rebuilding its drift chambers ready for the experiment to start up again this coming July. An intricate task involving the soldering of over 24,000 wires! The future of the NA48 experiment is coming right down to the wire, that is, the wires which the Collaboration is installing in the clean room of Hall 887 on the Prévessin site. Six days a week, technicians are working in shifts to rebuild the experiment's drift chambers. The original chambers were damaged when a section of a vacuum tube imploded at the end of 1999. A year ago, CERN gave the green light for this essential part of the spectrometer to be rebuilt, so the NA48 experiment, which studies CP violation (see box), still has a bright future ahead of it. Three years of data-taking ahead The NA48 experiment aims to penetrate the secrets of CP (Charge Parity) violation. Charge and parity are two parameters which distinguish a particle from an antiparticle. In other words, an electron possesses a negative electric ...

  14. FINSKI OBRAZOVNI SUSTAV. Refleksija na studijsku posjetu

    OpenAIRE

    Damjanović, Radojko

    2011-01-01

    Refleksija studijske posjete Finskoj pokušava predočiti čitatelju način funkcioniranja tamošnjeg obrazovnog sustava – organizacije, financiranja, povezanosti različitih razina vlasti, oblika decentralizacije, odnose između relevantnih društvenih aktera, odnose unutar samog sustava, života škole.

  15. Biossegurança na odontologia

    Directory of Open Access Journals (Sweden)

    André Luiz Dantas Bezerra

    2014-04-01

    Full Text Available Introdução: As atividades laborais, de modo geral, expõem os trabalhadores a riscos ocupacionais dos mais variados. Esses riscos incluem agentes físicos, químicos, ergonômicos, de acidentes e biológicos. O contato rotineiro com esses últimos deve ser motivo de reflexão e intervenção. Objetivo: Descrever os aspectos da biossegurança na odontologia. Métodos: Foi realizada uma revisão do estado da arte, adotando-se critérios para análise dos trabalhos mais diretamente relacionados à prática odontológica. A partir dos descritores controlados (DeCS "biossegurança" e "odontologia", procederam-se a busca na Literatura Latino-Americana e do Caribe em Ciências da Saúde, na Scientific Electronic Library Online, na National Library of Medicine e na Biblioteca Cochrane. Resultados: Com a associação entre os DeCS, chegou-se a 66 artigos, porém, após refinamento foram incluídos nesta revisão 12 artigos. Nos resultados foi evidenciado que a produção científica sobre biossegurança é vasta, bem como é ampla na odontologia, contudo, quando da concentração de trabalhos contempladores da associação dos termos biossegurança e odontologia, a quantidade de estudos diminui consideravelmente. Não obstante, as pesquisas foram, em sua maioria, desenvolvidas por estudiosos nacionais, da região nordeste e evidenciaram que o conhecimento e a adoção de medidas de segurança biológica na área ainda são insuficientes para garantir a proteção da equipe e dos pacientes qualitativamente. Conclusão: Sugere-se que as normas de precaução padrão sejam seguidas rigidamente e que ações de educação sejam promovidas entre os profissionais.

  16. IZOBRAŽEVANJE NA DOMU - ŠTUDIJA PRIMERA

    OpenAIRE

    Križan, Urška

    2014-01-01

    V teoretičnem delu se skozi literaturo seznanjamo z zakoni, ki na območju Republike Slovenije urejajo izobraževanje na domu, pa tudi s smernicami, ki veljajo na področju organiziranosti takega pouka. Po enem tednu, ki smo ga preživeli na domačiji skupaj s tremi šoloobveznimi otroki, ki se šolajo na domu, ugotavljamo, da je izvajanje izobraževanja na domu zmeraj v skladu z zakoni in pogosto v skladu s smernicami.

  17. Water transport by the renal Na(+)-dicarboxylate cotransporter

    DEFF Research Database (Denmark)

    Meinild, A K; Loo, D D; Pajor, A M;

    2000-01-01

    This study investigated the ability of the renal Na(+)-dicarboxylate cotransporter, NaDC-1, to transport water. Rabbit NaDC-1 was expressed in Xenopus laevis oocytes, cotransporter activity was measured as the inward current generated by substrate (citrate or succinate), and water transport....... This solute-coupled influx of water took place in the absence of, and even against, osmotic gradients. There was a strict stoichiometric relationship between Na(+), substrate, and water transport of 3 Na(+), 1 dicarboxylate, and 176 water molecules/transport cycle. These results indicate that the renal Na...

  18. VPLIV BARVE EMBALAŽE NA ZAZNAVANJE OKUSA GOSTEGA SOKA

    OpenAIRE

    Prevolšek, Daša

    2016-01-01

    Z barvami se srečujemo na vsakem koraku. Mogoče se njihovega vpliva ne zavedamo povsem, vendar nam lahko že pogled na določeno barvo dvigne ali pokvari razpoloženje. Barve imajo zelo velik vpliv na človeka in v nas prebujajo različna čustva. Nekatere barve so pozitivne in nas osrečujejo, druge pa na nas delujejo negativno. Ravno zaradi tega je tudi za oblikovalce embalaže zelo pomembno, da vnaprej predvidijo, kako se bodo potencialni porabniki njihovega izdelka odzivali na njihovo embalažo. P...

  19. Distribuirana analiza zapisa na oblaku primjenom MapReduce

    OpenAIRE

    Aydin, Galip; Hallac, Ibrahim R.

    2016-01-01

    U ovom članku opisujemo naš rad na projektiranju na mreži zasnovanog sustava analize distribuiranih podataka koji se zasniva na popularnom MapReduce okviru postavljenom na malom oblaku i razvijenom specijalno za analizu zapisa web poslužnika. Sustav analize zapisa sastoji se od nekoliko čvorova klastera, dijeli velike datoteke zapisa na distribuirani sustav datoteke i brzo ih obrađuje primjenom MapReduce modela programiranja. Klaster se stvara primjenom open source infrastrukture oblaka, čime...

  20. Phase Equilibria of Quaternary SystemNaCl-NaBr-Na2B4O7-H2O at 348 K

    Institute of Scientific and Technical Information of China (English)

    LI Ting; SANG Shi-hua; CUI Rui-zhi; ZHANG Kai-jie

    2013-01-01

    The phase equilibria of quatemary system NaC1-NaBr-Na2B4O7-H2O at 348 K were studied by the isothermal equilibrium method.The solubilities and densities of the equilibrium solution were determined.According to the experimental data,the phase diagram,density-composition diagrams and water content diagram of the quaternary system at 348 K were plotted respectively.And the phase diagram consists of one univariant curve,two crystallization fields and without any invariant point of the quaternary system.The equilibrium solid phases of the two crystallization fields were Na(C1,Br) and Na2B4O7·SH2O.The experimental results show that the quaternary system contained solid solution.The densities of the solution decrease with increasing NaC1 concentration and increase with increasing NaBr concentration.

  1. Asphericity in the Fermi Surface and Fermi Energy of Na-K, Na-Rb and Na-Cs Binary Alloys

    Institute of Scientific and Technical Information of China (English)

    Minal H. Patel; A.M. Vora; P.N. Gajjar; A.R. Jani

    2002-01-01

    Detailed theoretical investigations into asphericity in the Fermi surface (FS) and Fermi energy (FE) ofNa1_xKx, Na1_xRbx, and Na1_xCsx binary solid solutions are carried out for the first time. The alloying behavior ofthe K, Rb, and Cs with the Na generates the Fermi surface distortion (FSD) of bce simple metals. The FS of Na-K,Na-Rb, and Na-Cs solid solution is a distorted sphere with the largest deviation along [110]. We have found that theimpact of local-field correction function on FSD is maximun at [100] point and minimum at [111] point. The exchangeand correlation effect is found to suppress the value of FE.

  2. $^{24}$Mg($p$, $\\alpha$)$^{21}$Na reaction study for spectroscopy of $^{21}$Na

    CERN Document Server

    Cha, S M; Kim, A; Lee, E J; Ahn, S; Bardayan, D W; Chipps, K A; Cizewski, J A; Howard, M E; Manning, B; O'Malley, P D; Ratkiewicz, A; Strauss, S; Kozub, R L; Matos, M; Pain, S D; Pittman, S T; Smith, M S; Peters, W A

    2015-01-01

    The $^{24}$Mg($p$, $\\alpha$)$^{21}$Na reaction was measured at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory in order to better constrain spins and parities of energy levels in $^{21}$Na for the astrophysically important $^{17}$F($\\alpha, p$)$^{20}$Ne reaction rate calculation. 31 MeV proton beams from the 25-MV tandem accelerator and enriched $^{24}$Mg solid targets were used. Recoiling $^{4}$He particles from the $^{24}$Mg($p$, $\\alpha$)$^{21}$Na reaction were detected by a highly segmented silicon detector array which measured the yields of $^{4}$He particles over a range of angles simultaneously. A new level at 6661 $\\pm$ 5 keV was observed in the present work. The extracted angular distributions for the first four levels of $^{21}$Na and Distorted Wave Born Approximation (DWBA) calculations were compared to verify and extract angular momentum transfer.

  3. Muscle K+, Na+, and Cl- disturbances and Na+-K+ pump inactivation: implications for fatigue

    DEFF Research Database (Denmark)

    McKenna, Michael J; Bangsbo, Jens; Renaud, Jean-Marc

    2008-01-01

    Membrane excitability is a critical regulatory step in skeletal muscle contraction and is modulated by local ionic concentrations, conductances, ion transporter activities, temperature, and humoral factors. Intense fatiguing contractions induce cellular K(+) efflux and Na(+) and Cl(-) influx......, causing pronounced perturbations in extracellular (interstitial) and intracellular K(+) and Na(+) concentrations. Muscle interstitial K(+) concentration may increase 1- to 2-fold to 11-13 mM and intracellular K(+) concentration fall by 1.3- to 1.7-fold; interstitial Na(+) concentration may decline by 10 m......M and intracellular Na(+) concentration rise by 1.5- to 2.0-fold. Muscle Cl(-) concentration changes reported with muscle contractions are less consistent, with reports of both unchanged and increased intracellular Cl(-) concentrations, depending on contraction type and the muscles studied. When considered together...

  4. A dialética dos campos sociais na interpretação da problemática ambiental: uma análise crítica a partir de diferentes leituras sobre os problemas ambientais The dialectics of social fields in the interpretation of the environmental problematic: a critical analysis based on different readings of environmental problems

    Directory of Open Access Journals (Sweden)

    Cleyton Henrique Gerhardt

    2005-12-01

    Full Text Available A problemática ambiental constitui, atualmente, um importante espaço catalisador e produtor de valores regulatórios da vida humana e não-humana na biosfera terrestre. Porém, o que faz com que esta temática adquira tamanha envergadura em relação à sua identificação como problema social importante? A hipótese lançada aqui é a de que por trás desta difusa sensibilidade ambiental encontra-se em processo a configuração de um campo ambiental relativamente estruturado, no qual se busca, cada vez mais, a legitimidade para tratar das discussões sobre tudo aquilo que diz respeito ao meio ambiente. Neste sentido, tal espaço de lutas simbólicas tende a concentrar confrontos em torno do reconhecimento de certas ações e modos de pensamento, sendo que o que está colocado em jogo, neste caso, são as próprias percepções acerca do que seja o meio ambiente e, em contrapartida, as relações ontológicas construídas entre seres humanos e natureza. Com isto, a paulatina estruturação de um campo ambiental - este último funcionando como um amplo, dinâmico, instável e heterogêneo espaço de debate e de ação - tende a fazer com que determinados conceitos e práticas possam naturalizar-se e, concomitantemente, serem reconhecidas como "ambientalmente corretas". Em suma, a constituição deste domínio prático/discursivo irá concentrar os agentes e suas disputas sobre que saberes, comportamentos e procedimentos deveriam ser instituídos como sendo os mais "adequados" do ponto de vista ambiental. Entretanto, nesta perspectiva, o que seria visto (e adotado como ambientalmente "correto" ou "adequado" está, desde já, em disputa.At present, the environmental question constitutes an important space of catalysis and production of regulatory values of human and non-human life in the earth's biosphere. However, what makes this theme to attain such magnitude in relation to its identification as an important social problem? The hypothesis

  5. Na/beta-alumina/NaAlCl4, Cl2/C circulating cell

    Science.gov (United States)

    Cherng, Jing-Yih; Bennion, Douglas N.

    1987-01-01

    A study was made of a high specific energy battery based on a sodium negative electrode and a chlorine positive electrode with molten AlCl3-NaCl electrolyte and a solid beta alumina separator. The basic performance of a Na beta-alumina NaAlCl4, Cl2/C circulating cell at 200 C was demonstrated. This cell can be started at 150 C. The use of melting sodium chloroaluminate electrolyte overcomes some of the material problems associated with the high working temperatures of present molten salt systems, such as Na/S and LiAl/FeS, and retains the advantages of high energy density and relatively efficient electrode processes. Preliminary investigations were conducted on a sodium-chlorine static cell, material compability, electrode design, wetting, and theoretical calculations to assure a better chance of success before assembling a Na/Cl2 circulating cell. Mathematical models provide a theoretical explanation for the performance of the NaCl2 battery. The results of mathematical models match the experimental results very well. According to the result of the mathematical modeling, an output at 180 mA/sq cm and 3.2 V can be obtained with optimized cell design.

  6. Hidroginástica na terceira idade

    Directory of Open Access Journals (Sweden)

    Karla Campos de Paula

    1998-02-01

    Full Text Available O processo de envelhecimento no indivíduo saudável está relacionado com inúmeras alterações psicológicas e físicas que interferem na área motora, concorrendo para a inatividade e contribuindo para o aparecimento e agravamento de determinadas doenças, além de influenciar negativamente a realização das atividades de vida diária. Portanto, a prática de atividade física é fundamental para o idoso, não só na prevenção de doenças como na reabilitação de suas habilidades motoras, promovendo um estilo de vida saudável que é fator preponderante para a melhoria da qualidade de vida. Contudo, algumas precauções devem ser adotadas na prescrição da atividade direcionada para o idoso, a fim de que esta seja segura e prazerosa. Dentre os exercícios mais adequados aos idosos estão a caminhada, o ciclismo, a natação e a hidroginástica. Devido a sua grande procura, a hidroginástica vem aumentando o número de adeptos na terceira idade. Ela propicia ao idoso o aumento de sua capacidade aeróbia, força muscular, flexibilidade articular e o treinamento de habilidades específicas como equilíbrio e coordenação motora. Soma-se ainda o fato de esta atividade oferecer ambiente de relaxamento e incentivo ao contato social, atuando no combate ao estresse, depressão, na melhoria da autopercepção corporal e da auto-estima. Devemos, então, estar atentos às particularidades da hidroginástica, a fim de aproveitar todas as vantagens que esta oferece para o programa de exercícios direcionado para a terceira idade.

  7. A study on equilibria in the quaternary system Na2 B4 O7-Na2 SO4-NaCl-H2 O at 288 K%Na2B4O7-Na2SO4-NaCl-H2O四元体系288K相平衡研究

    Institute of Scientific and Technical Information of China (English)

    桑世华; 赵相颇; 钟丝摇; 张俊杰

    2013-01-01

    Solubilities and densities of solution in the quaternary system NaCl-Na2 SO4-Na2 B4 O7-H2 O at 288 K were studied by iso-thermal equilibrium method.Based on the solubility data ,the phase diagram of the quaternary system was plotted ,which consists of three univariant curves,one invariant point and three crystallization fields corresponding to NaCl ,Na2B4O7· 10H2O and Na2SO4· 10H2O.The experimental results show that sodium chloride (NaCl)had the salting-out effect on sodium borate(Na2B4O7)and sodi-um sulphate(Na2SO4).%  采用等温溶解平衡法研究了四元体系Na2 B4 O7-Na2 SO4-NaCl-H2 O 在288 K的相平衡关系,测定了平衡液相的溶解度及其密度。由研究结果知该四元体系为简单共饱和型,无复盐及固溶体形成。根据实验数据绘制了相应的相图。相图中有一个共饱点,三条单变曲线,三个结晶区平衡固相分别为:Na2 B4 O7·10H2 O, Na2 SO4·10H2 O和NaCl。实验结果表明NaCl对Na2 B4 O7和Na2 SO4有盐析作用,并简要讨论了实验结果。

  8. Transport of Na48 Drift Chambers to Dubna

    CERN Multimedia

    GOLOVATYUK, V

    2010-01-01

    On 22 July, in the occasion of the departure of the Na48 Drift Chambers from CERN, Mikhail Itkis (acting Director of the JIINR) and Rolf Heuer (CERN Director General) visited the NA62 experimental area.

  9. IZOBRAŽEVANJE SVETOVALCEV ZAPOSLITVE NA ZAVODU RS ZA ZAPOSLOVANJE

    OpenAIRE

    Kozamernik, Neva

    2010-01-01

    Diplomsko delo obravnava vlogo in pomen izobraževanja svetovalcev zaposlitve na Zavodu RS za zaposlovanje na Območni enoti Ljubljana v povezavi s svetovanjem in pomočjo brezposelnim osebam. Kajti spremembe zunanjega okolja

  10. CARACTERIZAÇÃO DE NANOFIOS DE GERMÂNIO SINTETIZADOS UTILIZANDO COBRE COMO CATALISADOR

    Directory of Open Access Journals (Sweden)

    Riama Coelho Gouveia

    2015-07-01

    Full Text Available This paper presents reliable synthesis of germanium nanowires by the vapor-liquid-solid method using copper as an alternative catalyst to gold, the most commonly used metal. The morphological study showed long range single-crystalline germanium nanowires with diamond structure and diameters ranging from 20 nm to 80 nm and lengths in tenths of a micrometer, which was much larger than the cross-section. In an investigation of electronic properties, devices built from a thin film of nanowires were studied and the semiconductor behavior of the samples confirmed, with variable range hopping identified as the main transport mechanism. Additionally, metal-nanowire contact behavior - ohmic or with Schottky barrier - was found to depend on the metal used in the device. Therefore, the possibility of controlling current-voltage behavior combined with the good crystalline quality of the nanowires renders these nanostructures an attractive option for future electronic and optoelectronic applications.

  11. Estudo da oxidação parcial do etanol em catalisadores de Rh por DRIFTS

    Directory of Open Access Journals (Sweden)

    Raquel Lima Oliveira

    2013-01-01

    Full Text Available The partial oxidation of ethanol on γ-Al2O3, CeO2, ZrO2 and Ce xZr1-xO2 supported rhodium catalysts was investigated by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS. The catalysts were characterized by temperature-programmed reduction (TPR and cyclohexane dehydrogenation. DRIFTS studies on the partial oxidation of ethanol showed that ethanol is adsorbed dissociatively, through O-H bond breaking, with the formation of ethoxy species, followed by successive dehydrogenation to acetaldehyde and acetyl species. Further oxidation to acetate and carbonate species lead to the formation of CO, CH4 and H2 by decomposition. The presence of CeO2 in the catalysts favored the oxidation steps due to its oxygen storage capacity.

  12. Interações hiperfinas em catalisadores metálicos Hyperfine interactions in metallic catalysts

    Directory of Open Access Journals (Sweden)

    Henrique Saitovitch

    2005-06-01

    Full Text Available Heterogeneous catalysts are of fundamental importance in several modern chemical processes. The characterization of catalysts is an issue of very present interest as it can provide a better understanding of the fundamental aspects of the catalytic phenomena, thus helping in the development of more efficient catalysts. In order to extend and improve the characterization of catalysts, new and less conventional methods are being applied, such as nuclear spectroscopies. In this paper we focus on the application of angular correlation, with can be used to resolve different local environments of probe atoms in solids and can be applied, as shown here, in the characterization of heterogeneous catalysts. A brief theoretical introduction is given and experimental results related to catalytic systems of alumina and niobia-supported Pt-In and Pd-In catalysts are presented.

  13. Metallic oxides for desulphurization catalyst reaction; Oxidos metalicos mistos como catalisadores para reacoes de dessulfurizacao

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, R.L.B.A.; Melo, D.M.A.; Melo, M.A.F. [Universidade Federal do Rio Grande do Norte, Natal, RN (Brazil); Souza, K.S.G.M. [Universidade Federal da Paraiba - Departamento de Engenharia Quimica, PB (Brazil); Barros, J.M.F. [Universidade Federal de Campina Grande - Campos Cuite, PB (Brazil)

    2010-07-01

    The mixed metal oxides constitute an important class of catalytic materials widely investigated in different fields of applications. Studies of rare earth nickelates have been carried by several researchers in order to investigate the structural stability afforded by oxide formed and the existence of catalytic properties at room temperature. So, this study aims synthesize the nano sized catalyst of nickelate of lanthanum doped with strontium (La(1- x)Sr{sub x}NiO4-{sigma}; x = 0,2 and 0,3), through the Pechini method and your characterization for subsequent application in the desulfurization of thiophene reaction. The precursor solutions were calcined at 300 degree C/2h for pyrolysis of polyester and later calcinations occurred at temperatures of 500 - 1000 degree C. The resulting powders were characterized by thermogravimetric analysis (TG / DTG), surface area for adsorption of N{sub 2} by BET method, Xray diffraction (XRD), scanning electron microscopy (HR{sub S}EM) and spectrometry dispersive energy (EDS). The results of XRD had show that the perovskites obtained consist of two phases (LSN and NiO) and from 700 degree C have crystalline structure. The results of SEM evidenced the obtainment of nano metric powders. The results of BET show that the powders have surface area within the range used in catalysis (5-50m{sup 2}/g). The characterization of active sites was performed by reaction of desulfurization of thiophene at room temperature and 200 degree C, the relation F/W equal to 0,7 mol h{sup -1}m{sub c}at {sup -1}. The products of the reaction were separated by gas chromatography and identified by the selective detection PFPD sulfur. All samples had presented conversion above 95%. (author)

  14. Jogos teatrais na escola pública

    Directory of Open Access Journals (Sweden)

    Ricardo Ottoni Vaz Japiassu

    1998-07-01

    Full Text Available O artigo apresenta os resultados parciais de pesquisa etnográfica que acompanha aspectos do desenvolvimento cultural de pré-adolescentes com a linguagem teatral em classe multisseriada, através do ensino regular de Teatro, em escola de ensino fundamental da rede pública estadual de São Paulo-SP. Os dados obtidos permitem afirmar que a linguagem cênica contribui na conscientização das novas possibilidades de significação da palavra na prática discursiva.The article shows partial results of ethnographic research in which kids are observed in their cultural development process with theater classes in public school education in São Paulo/Brazil. The data colected indicates that the use of theater games in school education helps students to be aware of a word’s new meaning possibilities in human comunication.

  15. Utjecaj sorte jabuke na kvalitetu suhog proizvoda

    OpenAIRE

    Dobričević, Nadica; Voća, Sandra; Pliestić, Stjepan; Magdić, D.

    2008-01-01

    Sorte jabuka Gloster, Jonagold, Idared, Melrose i Mutsu s pro-izvodnog područja sjeverozapadne Hrvatske ubrane su u tehnološkoj zriobi i skladištene u rashladnom prostoru na prosječnoj temperaturi od 2,0 oC i relativnoj vlazi zraka od 98% do užitne dospjelosti. Plodovi jabuka namijenjeni za sušenje očišćeni su i rezani na kockice veličine 1x1x1 cm. Količina mesa u analiziranim sortama je 63,37-75,46 %, količina kožica je 9,11-12,85 %, količina sjemene lože je 10,82-20,34 % i količina neupo...

  16. The NA60 experiment readout architecture

    CERN Document Server

    Floris, M; Usai, G L; David, A; Rosinsky, P; Ohnishi, H

    2004-01-01

    The NA60 experiment was designed to identify signatures of a new state of matter, the Quark Gluon Plasma, in heavy-ion collisions at the CERN Super Proton Synchroton. The apparatus is composed of four main detectors: a muon spectrometer (MS), a zero degree calorimeter (ZDC), a silicon vertex telescope (VT), and a silicon microstrip beam tracker (BT). The readout of the whole experiment is based on a PCI architecture. The basic unit is a general purpose PCI card, interfaced to the different subdetectors via custom mezzanine cards. This allowed us to successfully implement several completely different readout protocols (from the VME like protocol of the MS to the custom protocol of the pixel telescope). The system was fully tested with proton and ion beams, and several million events were collected in 2002 and 2003. This paper presents the readout architecture of NA60, with particular emphasis on the PCI layer common to all the subdetectors. (16 refs).

  17. O Personal Trainer na Perspectiva do Marketing

    Directory of Open Access Journals (Sweden)

    Cibele Biehl Bossle

    2011-03-01

    Full Text Available Esse estudo apresenta mapeamento das referências dedicadas à formação do personal trainer em bases de dados eletrônicas. Essa garimpagem revelou baixa produção científica sobre o assunto e mostrou que na literatura sobre personal trainer predominam livros com linguagem corrente no mundo dos negócios. Esses achados nos levaram a indagar sobre a força do discurso físico-empresarial, especialmente o marketing, na constituição desta ocupação profissional. Jeremy Rifkin, Zygmunt Bauman, Paula Sibilia e Denise Sant'Anna permitiram visualizar que o marketing dirigido ao personal trainer tem como tarefa reinventar, ressignificar e "repaginar" esta modalidade de serviço em nome da sobrevivência no disputado mercado da vida ativa.

  18. NA62 experiment at CERN SPS

    Directory of Open Access Journals (Sweden)

    Kozhuharov Venelin

    2014-01-01

    Full Text Available The NA62 experiment at SPS is a continuation of the long standing CERN kaon physics program. The high statistics and the unprecedent precision allow to probe the Standard Model and test the description of the strong interactions at low energy. The final results on the the lepton universality test by measuring the ratio RK = Γ(K+ → e+ν/Γ(K+ → µ+ν and the study of the K± → π±γγ decay are presented. The major goal of the NA62 experiment is to perform a measurement of the Br(K+ → π+νν̄ with a precision of 10% in two years of data taking. The detector setup together with the analysis technique is described.

  19. KONGENITALNA CISTIČNA ADENOMATOIDNA MALFORMACIJA

    OpenAIRE

    VLADAREANU, Radu; Pelinescu-Onciul, Dimitrie; Zvânca, Mona; Mihalescu, Doina

    2007-01-01

    Cistična adenomatoidna malformacija pluća (CACM) je rijetka bolest s pojavnošću od 1/25 000 do 1/35 000 trudnoća, razvojna pogrješka koja nastaje preraštanjem terminalnih respiratornih mjehurića. Prenatalna dijagnoza se zasniva na ultrazvučnom prikazu hiperehogenog tumora pluća, koji može biti mikrocističan i makrocističan. Pri bolesti može nastati pomak medijastinuma, fetalni hidrops ili polihidramnios. Ishod je loš u bilateralnim slučajevima, u onima s hipolazijom pluća i fetalnim hidropsom...

  20. ODGOVORNO ORGANIZACIJSKO PONAŠANJE: PROVJERA KONSTRUKTA NA HRVATSKOM UZORKU

    OpenAIRE

    Penezić, Zvjezdan; Rak, Ivana; Slišković, Ana

    2013-01-01

    Osnovni cilj ovog istraživanja bila je provjera konstrukta odgovornoga organizacijskog ponašanja na hrvatskom uzorku ispitanika. Ispitivanje je provedeno metodom ankete na 195 zaposlenika u bankama. Rezultati su potvrdili postojanje pet dimenzija konstrukta: altruizam, savjesnost, građanske vrline, uljudnost i fer ponašanje te upozorili na razlike u pojedinim dimenzijama konstrukta s obzirom na sociodemografske osobine. Ispitanici jedino dimenziju altruizma doživljavaju p...

  1. Na2CO3和NaHCO3胁迫对菊苣种子萌发的影响%Effects of Na2CO3 and NaHCO3 Stress on Seed Germination of Chicory

    Institute of Scientific and Technical Information of China (English)

    郭丹丹

    2013-01-01

    [目的]为研究Na2CO3和NaHCO3等碱性盐对植物的胁迫伤害提供依据.[方法]用不同浓度的Na2CO3和NaHCO3溶液处理菊苣种子,并对其发芽率、发芽势、根长、苗长和鲜重等生理指标进行研究.[结果]低浓度Na2CO3和NaHCO3对萌发后菊苣的苗长、根长和鲜重有一定的促进作用,但对根苗比的影响表现为抑制.[结论]低浓度Na2CO3和NaHCO3对种子萌发有增效效应.%[Objective] The research aimed to provide the basis for the study of the damage of the stress of basic salt such as Na2CO3 and NaHCO3 on the plants.[Method] Chicory seeds were treated with Na2CO3 and NaHCO3 solution of different concentration.The physiological indicators such as germination rate,germination potential,root length,seedling length and fresh weight were studied.[Result] A low concentration of Na2CO3 and NaHCO3 could promote germination rate,germination potential,then promote seedling length,root length and fresh weight after germination.However,it showed the performance for suppression on the ratio of root and shoot.[Conclusion] A low concentration of Na2CO3 and NaHCO3 had synergistic effect on chicory seed germination rate and germination potential.

  2. RAZVOJ INTELIGENTNEGA OKOLJA ZA PAMETNI DOM NA PLATFORMI ARM

    OpenAIRE

    Pogorevc, Simon

    2013-01-01

    Magistrska naloga najprej poda pregled sistemov za inteligentni dom, kot jih dandanes že poznamo. V nadaljevanju podajamo zasnovo inteligentnega okolja za pametni dom na ARM platformi. Sledi še razvoj sistema inteligentnega okolja na strojni platformi z ARM procesorjem. Za platformo smo izbrali procesor LPC1768 in razvili vse potrebne vhodno-izhodne module. Pri razvoju smo uporabili programski paket Altium Designer za načrtovanje strojne platforme in tudi za samo načrtovanje vezja. Za razvoj ...

  3. UPORABA KODE QR NA MOBILNIH NAPRAVAH

    OpenAIRE

    Taciga, Matej

    2013-01-01

    V diplomski nalogi je opisan je razvoj aplikacije za mobilno napravo na platformi Windows Phone, ki omogoča branje QR kode. Aplikacijo smo razvili v programskem jeziku C#. Zajete in opisane so možnosti uporabe QR kode. Opisano je testiranje obstoječih aplikacij s QR čitalci. Predstavljena sta tudi razvoj in struktura QR kode. S primerom je razloženo kako so podatki zakodirani v kodo.

  4. Prototype calorimeters for the NA3 experiment

    CERN Multimedia

    1975-01-01

    The NA3 Experiment was set-up on the North Area of the SPS by the CERN/ Ecole Polytechnique/College de France/ Orsay/Saclay Collaboration, to study high transverse momentum leptons and hadrons from hadron collisions. The calorimeters measured the energy of hadrons (prototype on the right) and leptons (prototype on the left). They used a new type of plastic scintillator (plexipop). (see CERN Courier of November 1975) energy (prototype on the right)

  5. Posso ser eu mesmo na escola?

    Directory of Open Access Journals (Sweden)

    Wilton Orlando Trapp

    2012-04-01

    Full Text Available Este texto faz uma reflexão acerca da importância de se pensar a escola como um lugar da convivência humana e do respeito à cultura do brincar/jogar, trazendo contribuições à superação da influência mercadológica presente nas práticas de movimento e na forma de planejar o uso do espaço escolar.

  6. Acetylene diffusion in Na-Y zeolite

    Indian Academy of Sciences (India)

    S Mitra; S Sumitra; A M Umarji; R Mukhopadhyay; S Yashonath; S L Chaplot

    2004-08-01

    Study of diffusivity of acetylene adsorbed in Na-Y zeolite by quasi-elastic neutron scattering (QENS) measurements at temperatures of 300, 325 and 350 K is reported. A model in which the acetylene molecules undergo random-walk diffusion characterized by a Gaussian distribution of jump lengths inside zeolite cages describes the data consistently. The diffusion constant, residence time between jumps and root mean square jump length are determined.

  7. Latest results from the NA57 experiment

    OpenAIRE

    Bruno, Giuseppe Eugenio

    2005-01-01

    The NA57 experiment at the CERN SPS has measured the production of strange and multi-strange particles in Pb-Pb (and p-Be) collisions at mid-rapidity. The collective dynamics of the collision is studied in the transverse and longitudinal directions as a function of centrality and beam momentum and analysed based on hydrodynamical models. Central-to-peripheral nuclear modification factors at 158 A GeV/c are presented and compared with other measurements and theory.

  8. NA49: lead-lead collisions

    CERN Multimedia

    1996-01-01

    This is an image of an actual lead ion collision taken from tracking detectors on the NA49 experiment, part of the heavy ion project at CERN. These collisions produce a very complicated array of hadrons as the heavy ions break up. It is hoped that one of these collisions will eventually create a new state of matter known as the quark-gluon plasma.

  9. Ispitivanje otpornosti na tlak polivinilkloridne kanalizacijske cijevi

    OpenAIRE

    Zagorec, Mijo

    2003-01-01

    U radu je istaknuto da cijevi od polivinilklorida, politilena i polipropilena imaju drugačija mehanička svojstva od krutih tradicionalnih kanalizacijskih cijevi. Opisana su trostruka laboratorijska ispitivanja otpornosti kanalizacijskih cijevi od tvrdog polivinilklorida na tjemeni tlak da se ustanovi koje vertikalno stalno i pokretno opterećenje mogu izdržati te cijevi pri određenom deformiranju i koliko zbijeni materijal uokolo cijevi sudjeluje u preuzimanju toga tlaka.

  10. NA35: sulphur-gold collision

    CERN Multimedia

    1991-01-01

    In this image the real particles produced by the collision of a 6400 GeV sulphur ion with a gold target can be seen as they pass through a streamer chamber. Streamer chambers consist of a gas chamber through which a strong pulsed electric field is passed, creating sparks as a charged particle passes through it. The NA35 experiment, which was in operation in the 1980s, was part of CERN's ongoing heavy ion project.

  11. Envolvimento do sistema nervoso central na cisticercose

    Directory of Open Access Journals (Sweden)

    Aristides Cheto de Queiroz

    1979-03-01

    Full Text Available No estudo do envolvimento do SNC na cisticercose, verificou-se uma freqüência de 0,3%, sempre como achado incidental no estudo de rotina de autópsias; apenas um caso mostrou boa correlação com a presença de manifestações neurológicas. Esta freqüência que é baixa em relação ao que é observado em outras regiões do Brasil, mostra que a neurocisticercose não representa um grande problema na região. As reações do hospedeiro ao embrião do cisticerco foram sempre do tipo inflamatório crônico e fibrosante. Neste estudo ficou demonstrada a importância do método de impregnação pela prata (Grocott na identificação do esqueleto do cisticerco no interior de lesões fibrosantes e/ou calcificadas.

  12. Report from the NA61/SHINE experiment

    CERN Document Server

    Aduszkiewicz, A

    2015-01-01

    This document reports on the status and plans of the NA61/SHINE experiment at the CERN SPS as of October 2015. First, an overview of the 2014 and 2015 data-taking period on p+Pb interactions at 158 GeV/c and Ar+Sc collisions at 13A GeV/c - 150A GeV/c is given. The latter data-taking with the first primary Ar beams at CERN was a major success. Second, the facility maintenance and upgrades are briefly presented. The VTX-1 magnet was damaged at the beginning of the 2015 proton period. The physics data-taking for p+p interactions at 400 GeV/c and for the Fermilab neutrino beams as well as the pilot data taking on Pb+Pb collisions at 30A GeV/c was replaced by detector tests and calibration runs. Third, the advance in the NA61/SHINE software and calibration procedures is briefly reported. Fourth, new physics results are presented. In particular, the very first results on Ar+Sc collisions are presented. Fifth, plans for data taking in 2016 - 2018 are outlined and ideas concerning the NA61/SHINE physics programme...

  13. Afasia adquirida na infância

    Directory of Open Access Journals (Sweden)

    Eliana C. Wanderley

    1969-06-01

    Full Text Available São relatados dois casos de afasia em menina de 10 anos e menino de 8 anos, conseqüentes a lesão cerebral por projétil de arma de fogo no primeiro caso e septicemia com tromboflebite no segundo. Nos dois casos a evolução foi bastante favorável e ambos os pacientes apresentaram percepção praticamente normal com distúrbios na expressão oral que assumia várias vezes o tipo de lapso amnéstico. A expressão gráfica nos dois casos foi mais atingida como sonseqüência de estar menos automatizada. O fenômeno da perseveração foi notado na fala no primeiro caso e, na escrita, no seguno. Foi discutida a justificativa do diagnóstico e lembrado o diagnóstico diferencial com outros distúrbios da fala em crianças.

  14. NaI(Tl) response functions

    International Nuclear Information System (INIS)

    The response functions of a NaI(Tl) detector have been estimated using Monte Carlo methods. Response functions were calculated for monoenergetic photon sources (0.05 to 3 MeV). Responses were calculated for point-like sources and for sources distributed in Portland cement cylinders. The responses were used to calculate the efficiency functions in term of photon energy. Commonly, sources used for calibration are point-like, and eventually sources to be measured have different features. In order to use the calibrated sources corrections due to solid angle, self-absorption and scattering, must be carried out. However, some of these corrections are not easy to perform. In this work, the calculated responses were used to estimate the detector efficiency of point-like sources, and sources distributed in Portland type cement. Samples of Portland paste were prepared and were exposed to photoneutrons produced by a 15 MV linac. Some of the elements in the cement were activated producing γ-emitting radionuclides that were measured with a NaI(Tl) gamma-ray spectrometer, that was calibrated with point-like sources. In order to determine the specific activity in the induced radioisotopes calculated efficiencies were used to make corrections due to the differences between the solid angle, photon absorption and photon scattering in the point-like calibration sources and the sources distributed in cement. During the interaction between photoneutrons and the cement samples three radioisotopes were induced: 56Mn, 24Na, and 28Al. (Author)

  15. Resonances production from the NA60 experiment

    Directory of Open Access Journals (Sweden)

    De Falco A.

    2012-11-01

    Full Text Available The NA60 experiment at the CERN SPS has studied light vector meson production in In-In collisions at 158A GeV. The ϕ meson was detected via both the K+K− and the μ+μ− decay channels. The yields and inverse slope parameters of the mT spectra observed in the two channels are compatible within errors, different from the large discrepancies seen in Pb-Pb collisions between the hadronic (NA49 and dimuon (NA50 decay channels. In the invariant mass region 0.2 1 GeV, the excess is found to be prompt, with remarkable differences with respect to the Drell-Yan process. The Teff slope parameter, extracted from the transverse mass spectra, shows a rise with mass up to the ρ, followed by a sudden decline for higher masses. The former is consistent with radial flow of a hadronic source, while the latter suggests a dominantly partonic emission source.

  16. Hadron production measurement from NA61/SHINE

    CERN Document Server

    Korzenev, A

    2013-01-01

    New results from the NA61/SHINE experiment on the determination of charged hadron yields in proton-carbon interactions are presented. They aim to improve predictions of the neutrino flux in the T2K experiment. The analysis is based on the main dataset collected by NA61/SHINE in the year 2009. The data were recorded using a secondary-proton beam of 31 GeV/$c$ momentum from CERN SPS which impinges on a graphite target. To determine the inclusive production cross section for charged pions, kaons and protons a thin target was exploited. Results of this measurement are used in the T2K beam simulation program to reweight hadron yields at the interaction vertex. At the same time, NA61/SHINE results obtained with the T2K replica target allow to constrain hadron yields at the surface of the target. This allows to constrain up to 90% of the neutrino flux, thus reducing significantly the model dependence of the neutrino beam prediction. All measured spectra are compared to predictions of hadron production models.

  17. Void Formation in Heavily Irradiated NaCl

    NARCIS (Netherlands)

    Vainshtein, D.I.; Dubinko, V.I.; Turkin, A.A.; Hartog, H.W. den

    1999-01-01

    Experimental and the oretical results are presented on the formation of voids discovered recently in havily irradiated NaCl. Experimental data show that for NaCl samples with particular dopants, the development of radiation damage, such as Na-colloids, chlorine inclusions and voids does not show a s

  18. UREDITEV SPOLNEGA NADLEGOVANJA NA DELOVNEM MESTU V REPUBLIKI SLOVENIJI

    OpenAIRE

    Golavšek, Nastja

    2009-01-01

    V diplomski nalogi je predstavljena problematika spolnega nadlegovanja na delovnem mestu. Spolno nadlegovanje je nezaželeno ravnanje spolne narave ali drugo ravnanje, temelječe na spolu, ki ogroža dostojanstvo žensk in moških na delovnem mestu

  19. Explosive phenomena in heavily irradiated NaCl

    NARCIS (Netherlands)

    denHartog, HW; Vainshtein, DI; Matthews, GE; Williams, RT

    1997-01-01

    In heavily irradiated NaCl crystals explosive phenomena can be initiated during irradiation or afterwards when samples are heated to temperatures between 100 and 250 degrees C. During irradiation of NaCl Na and Cl-2 precipitates and void structures are produced along with the accumulation of stored

  20. Stress of Cl- is Stronger than That of Na+ on Glycine max Seedlings Under NaCl Stress

    Institute of Scientific and Technical Information of China (English)

    LUO Qing-yun; YU Bing-jun; LIU You-liang

    2002-01-01

    Seedlings of six Glycine max cultivars were used to compare Cl- with Na+ in stress effects onsoybean seedlings under NaCl stress. Results showed that stress of NaCl on G. max seedlings was mainlycaused by Cl- and not by Na+. After treatment with isoosmotic solutions of Cl- (without Na+ ) and Na+ (with-out Cl-) respectively, fresh weight and height of G. max seedlings growing in solution of Cl- were much morestressed than those in solution of Na+. And the roots and leaves electrolyte leakage were much more increasedunder stress of Cl- than those under stress of Na+. Salt tolerance of G. max seedlings was mainly contributedto Cl- withheld in roots of seedlings to decrease its content in leaves.

  1. Experimental Study of Na based Titanium Nanofluid-Water Reaction

    Energy Technology Data Exchange (ETDEWEB)

    Park, Gunyeop; Kim, Soo Jae; Baek, Jehyun; Kim, Hyun Soo; Oh, Sun Ryung; Park, Hyun Sun; Kim, Moo Hwan [POSTECH, Pohang (Korea, Republic of)

    2015-10-15

    In KALIMER-600, a sodium-cooled fast reactor designed by KAERI, thermal energy is transported from high-temperature liquid Na (526 .deg. C at 0.1 MPa) to low temperature water (230 .deg. C at - 19.5 MPa) through a heat exchanger. If any leakage or rupture occurs during the operation of this heat exchanger, highly pressurized liquid water can penetrate into the liquid Na channels; this contact should instantly cause SWR. As reaction continues, liquid water is soon vaporized by pressure drop and huge amount of reaction heat. This generated water vapor expands large reaction area and increases sodium-water vapor reaction process. Therefore, the rapid generation of reaction product (like H{sub 2}) and water vapor increases the system pressure that can cause the system failure in SFR. To reduce this strong chemical reaction phenomena between Na and water, some we have focused on suppressing the chemical reactivity of liquid Na by dispersing nanoparticles (NPs). For the real application of NaTiNF, the pressure change induced by NaTiNF-water reaction is compared with Na-water reaction in the present study. NaTiNF contains 100nm of Ti NPs at 0.2 vol. %. The reaction rate of NaTiNF-water reaction is also investigated as reaction temperature increases. Sodium-water vapor reaction (SVR) will occur when an SWR accident occurs in SFR. In this manner, NaTiNF-water vapor reaction is experimentally performed for ensuring the suppression of chemical reactivity of NaTiNF in contact with water vapor. In the basic step for reducing risk of an SWR in SFR, we have experimentally verified the suppressed chemical reactivity of liquid sodium using Ti NPs through SWR and SVR experiments. In SWR, Na based titanium nanofluid (NaTiNF) shows lower pressure change than Na. As T{sub R} increases, P{sub max} in Na-water reaction increases while NaTiNF does not. The reaction rate of NaTiNF shows twice slower than that of Na. In SVR, NaTiNF shows slower temperature increase than Na. The distinct

  2. Plant Defensins NaD1 and NaD2 Induce Different Stress Response Pathways in Fungi.

    Science.gov (United States)

    Dracatos, Peter M; Payne, Jennifer; Di Pietro, Antonio; Anderson, Marilyn A; Plummer, Kim M

    2016-01-01

    Nicotiana alata defensins 1 and 2 (NaD1 and NaD2) are plant defensins from the ornamental tobacco that have antifungal activity against a variety of fungal pathogens. Some plant defensins interact with fungal cell wall O-glycosylated proteins. Therefore, we investigated if this was the case for NaD1 and NaD2, by assessing the sensitivity of the three Aspergillus nidulans (An) O-mannosyltransferase (pmt) knockout (KO) mutants (An∆pmtA, An∆pmtB, and An∆pmtC). An∆pmtA was resistant to both defensins, while An∆pmtC was resistant to NaD2 only, suggesting NaD1 and NaD2 are unlikely to have a general interaction with O-linked side chains. Further evidence of this difference in the antifungal mechanism was provided by the dissimilarity of the NaD1 and NaD2 sensitivities of the Fusarium oxysporum f. sp. lycopersici (Fol) signalling knockout mutants from the cell wall integrity (CWI) and high osmolarity glycerol (HOG) mitogen-activated protein kinase (MAPK) pathways. HOG pathway mutants were sensitive to both NaD1 and NaD2, while CWI pathway mutants only displayed sensitivity to NaD2. PMID:27598152

  3. NA1, NA1, NA1-trimethylinsulin--an insulin analogue with a quaternary amino group at the A1 terminus.

    Science.gov (United States)

    Drewes, S E; Magojo, H E; Gliemann, J

    1981-06-01

    By utilizing the differing reactivity of the amino groups in aqueous organic solvents, des-GlyA1-NB1,N epsilon B29-(Msc)2-insulin was prepared. Its reaction with the phenyl ester of N,N,N-trimethylglycine in the presence of N-hydroxysuccinimide afforded the crystalline NA1,NA1,NA1-trimethylinsulin analogue. In the fat cell assay this analogue has an activity of 49% and, in the mouse convulsion assay, it is 70%. PMID:7024089

  4. LOGOTIPI SKOZI ČAS - NA PRIMERU OLIMPIJSKIH LOGOTIPOV

    OpenAIRE

    Žalik, Saša

    2014-01-01

    Skozi bogato in dolgo zgodovino olimpijskih iger je šport postal ena izmed največjih »industrij« na svetu. Sodobno oglaševanje se osredotoča na potrošnika predvsem na vizualen način. Ljudje se v prvi vrsti identificirajo z olimpijskimi igrami preko logotipa oz. olimpijskih krogov, ki spadajo med najbolj prepoznaven znak na svetu. V diplomski nalogi je bil predstavljen olimpijski logotip kot vizualna predstavitev svetovnega medijskega dogodka. Raziskan je bil razvoj logotipov olimpijskih ig...

  5. E-IZOBRAŽEVANJE NA DOKTORSKEM ŠTUDIJU

    OpenAIRE

    Novaković, Olivera

    2012-01-01

    Razvoj novih tehnologij (predvsem IKT) ima pomemben vpliv tudi na izobraževanje, zato si danes težko zamislimo študij na daljavo brez uporabe vsaj nekaterih oblik in tehnologij e-izobraževanja. Razvoj v tej smeri je prišel do točke, ko ko je potrebno tradicionalno delitev na klasično izobraževanje in izobraževanju na daljavo preoblikovati v delitev na klasično in odprto izobraževanje, kjer v kontekstu slednjega e-izobraževanje postaja njegova glavna komponenta. Velik pomen e-izobraževanj...

  6. HIDRAVLIČNA ANALIZA VODOVODNEGA SISTEMA REČICA

    OpenAIRE

    Jamnikar, Rok

    2010-01-01

    Diplomsko delo obravnava hidravlične razmere na vodovodnem sistemu Rečica. Pri tem je poudarek predvsem na analizi tlačnih in pretočnih razmer s pomočjo uporabe ustreznega programskega orodja. Vsebina dela je razdeljena na teoretični in praktični del. Teoretični del zajema znanja, potrebna za ustrezno vzpostavitev hidravličnega modela, izračune ter analizo hidravličnih razmer, medtem ko se v praktičnem delu osredotočim na konkretno zasnovo vodovodnega sistema Rečica. Na podlagi zasnove...

  7. Vpliv sončnih elektrarn na napetostni profil

    OpenAIRE

    Zupanc, Karel

    2013-01-01

    Z vključevanjem sončnih fotonapetostnih elektrarn v elektroenergetski sistem lahko vplivamo na smer pretoka moči in posledično napetostni profil vzdolž nizkonapetostnega omrežja. Cilj magistrskega dela je bil na podlagi meritev in analitičnega orodja prepoznati ter ovrednotiti eventualne negativne vplive na napetostni profil. Ugotovili smo, da sončne fotonapetostne elektrarne na obravnavanem področju vplivajo na napetostni profil, vendar v mejah dovoljenega. To pa ne pomeni, da negativne...

  8. The brute-force polarization of 23Na and the 23Na(n,γ)24Na reaction

    International Nuclear Information System (INIS)

    A Na target has been polarized by brute force to 22% and the γ radiation produced by polarized thermal neutron capture has been investigated. The 2+ channel spin contribution has been determined model independently and unambiguously for 22 primary transitions. The average 2+ channel contribution is 5.8(5)%. Spins of final levels are in agreement with previous assignments. For three levels spin restrictions have been made. The energies of positive parity levels are in agreement with a shell model calculation in the complete sd shell. (Auth.)

  9. Kazališna umjetnost i Franjo Marković, s posebnim osvrtom na recepciju u novinama na njemačkom jeziku

    OpenAIRE

    Papić Bogadi, Valentina; Peklić, Ivan

    2012-01-01

    Autori u članku na temelju izvorne građe i literature opisuju djelatnost Franje Markovića vezanu uz kazalište. Na početku rada autori su prikazali kratki životopis Franje Markovića. Istaknuli su teoretske osnove Markovićeva rada koji se odnosi na kazališnu umjetnost. Autori su prikazali Markovića kao pisca dramskih djela, posebno se osvrnuvši na njegove drame u kazalištu. Markovićeve drame prikazivane su u Hrvatskom narodnom kazalištu, a kritike objavljivane u novinama. Osim kritika u novi...

  10. NA48 experiment : view along the NA48 beamline with the detector in the distance.

    CERN Multimedia

    Hans Taureg

    1996-01-01

    Photo 02: Side view of the NA48 experiment showing the LKR calorimeter cryostat No one is sure why the Universe wound up the way it has: all matter and no antimatter. According to prevailing theories, the early universe had equal amounts of matter and antimatter. To see what might be missing from the theories, physicists search for the rare cases in which matter and antimatter behave differently. One such imbalance, called direct CP violation, showed up in the NA 31 experiment at CERN. The results from this experiment, first presented in 1993, showed that when K mesons and their antimatter cousins decay, they show a slight preference for matter over antimatter. Later experiments with neutral K mesons, including NA48 at CERN and KTeV at Fermilab in the United States, showed direct CP violation is real.

  11. A coprecipitation technique to prepare NaNbO3 and NaTaO3

    Indian Academy of Sciences (India)

    V Samuel; A B Gaikwad; V Ravi

    2006-04-01

    A simple coprecipitation technique has been used successfully for the preparation of pure, ultrafine, single phases of NaNbO3 (NN) and NaTaO3 (NT). An alcoholic solution of ammonium carbonate and ammonium hydroxide was used to precipitate Na+ and Nb5+ (or Ta5+) cations under basic conditions as carbonate and hydroxide, respectively. On heating at 700°C, these precursors produce respective products. For comparison, both NN and NT powders were also prepared by the traditional solid state method. The phase purity and lattice parameters were studied by powder X-ray diffraction (XRD). The particle size and morphology were studied by scanning electron microscopy (SEM).

  12. Specific oxidation pattern of soluble starch with TEMPO-NaBr-NaClO system.

    Science.gov (United States)

    Hao, Jie; Lu, Jiaojiao; Xu, Naiyu; Linhardt, Robert J; Zhang, Zhenqing

    2016-08-01

    Oxidized starch, one of the most important starch derivatives, has many different properties and applications. Currently, there are two ways to produce oxidized starch, through specific and nonspecific oxidation. Specific oxidation using the stable nitroxyl radical, 2,2,6,6-tetramethyl preparidinloxy (TEMPO), with NaBr and NaClO can produce oxidized starches with different properties under good quality control. In the current study, we examine the products of specifically oxidized starch. As the amount of oxidant and the temperature, two critical factors impacting the oxidation of starch were thoroughly investigated. Analysis of the molecular weight (MW), degree of oxidization (DO) and the detailed structures of corresponding products was accomplished using gel permeation chromatography with multi-angle laser light scattering (GPC-MALLS), infrared (IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and quadrapole time-of-flight mass spectrometry (Q/TOF-MS). According to the analytical results, the oxidation patterns of starch treated with specific oxidant TEMPO-NaBr-NaClO were established. When high amounts of oxidant was applied, more glucose residues within starch were oxidized to glucuronic acids (higher DO) and substantial degradation to starch oligosaccharides was observed. By selecting a reaction temperature of 25°C a high DO could be obtained for a given amount of oxidant. The reducing end sugar residue within oxidized starch was itself oxidized and ring opened in all TEMPO-NaBr-NaClO reactions. Furthermore, extra oxidant generated additional novel structures in the reducing end residues of some products, particularly in low temperature reactions. PMID:27112871

  13. Glosa o narcyzmie na marginesie "Lodowych pól" Zofii Nałkowskiej

    OpenAIRE

    Zawiszewska, Agata

    2013-01-01

    The article suggests a reading of Nałkowska’s first work, treated as a literary study of narcissism. In "Lodowe pola" Nałkowska made an unsuccessful attempt to express the work through an inner narcissistic conflict, giving the protagonist, Janka Dernowiczówna, the qualities of narcissistic personality, such as individualism, dandyism, estheticism, Nietzsche-ism, atrophy of instinct, need for self-control, stage directing of life, and never-satisfied self love. The author also transferred her...

  14. Programar para prevenir : o uso do Scratch na segurança na internet

    OpenAIRE

    Lopes, Ana João Ribeiro; Coutinho, Clara Pereira

    2013-01-01

    O ambiente de programação Scratch, criado pelo MIT em 2007, permite criar facilmente histórias interativas, animações, jogos, música e arte e partilhar essas criações na web. O presente artigo apresenta um projeto de intervenção pedagógica supervisionada, com uma componente investigativa, que envolveu a utilização do Scratch, como estratégia para promover o desenvolvimento de competências e estruturar conhecimentos relativos à Segurança na Internet. O estudo foi implementado numa ...

  15. Vpliv metode načrtovanja nosilnosti na količino armature armiranobetonske stavbe

    OpenAIRE

    Hrastnik, Miha

    2015-01-01

    V diplomski nalogi obravnavamo šestetažno armiranobetonsko stavbo z dvema kletnima etažama. Cilj naloge je ugotoviti razliko v potrebni količini armature v nosilnih elementih stavbe, če jo določimo glede na obremenitve iz potresnega projektnega stanja z upoštevanjem pravil standarda SIST EN 1992, ali z upoštevanjem obeh standardov SIST EN 1992 in 1998, ki predpisuje strožje konstrukcijske zahteve in predvideva uporabo postopka načrtovanja nosilnosti, kar povečuje varnost pri proje...

  16. Osteoporose na infância e na adolescência

    OpenAIRE

    Campos Lúcia M. A.; Liphaus Bernadete L.; Silva Clóvis A. A.; Pereira Rosa M. R.

    2003-01-01

    OBJETIVO: Revisar a literatura acerca da osteoporose na infância e adolescência, abordando diagnóstico, prevenção e tratamento de osteopenia e osteoporose. FONTE DOS DADOS: Foram utilizadas informações através de revisão bibliográfica, realizada por busca direta de artigos científicos e por pesquisa nas bases de dados Medline e Lilacs, no período de 1992 a 2002. SÍNTESE DOS DADOS: O artigo é estruturado em tópicos, nos quais procura-se definir e classificar a osteoporose na infância, enfatiza...

  17. Mikcijska ultrazvučna cistografija uz softver osjetljiv na kontrast u dijagnostici vezikoureteralnog refluksa

    OpenAIRE

    Roić, Goran; Cvitković Roić, Andrea; Palčić, Iva; Miletić, Damir

    2014-01-01

    Razvojem tehnologije specifičnog softvera osjetljivog na kontrast i uvođenjem ultrazvučnog kontrastnog sredstva mikcijska ultrazvučna cistografija postala je rutinska metoda u dijagnostici vezikoureteralnog refluksa u dječjoj dobi. Mnoge studije pokazuju da je osjetljivost ove metode veća u usporedbi s mikcijskom cistouretrografijom, a vrlo bitna prednost je izostanak korištenja ionizirajućeg zračenja. Posljednjih je godina sve viša svijest o potencijalnim štetnim učincima izloženosti ionizir...

  18. Fitoterápicos na odontologia: estudo etnobotânico na cidade de Manaus

    Directory of Open Access Journals (Sweden)

    S. S. Evangelista

    2013-01-01

    Full Text Available O reconhecimento oficial da fitoterapia na odontologia no Brasil veio acompanhado de diversas lacunas na pesquisa científica e na utilização de plantas medicinais, especificamente para espécies vegetais com aplicação nas doenças da cavidade oral. O estado do Amazonas, especificamente a cidade de Manaus, não possui um diagnóstico da aplicabilidade de plantas medicinais nos serviços de atenção Odontológica. Esse estudo propôs realizar um estudo do tipo quali-quantitativo, descritivo e exploratório visando o levantamento da comercialização de plantas medicinais e o estudo etnobotânico para identificação das principais plantas medicinais indicadas e utilizadas nas patologias orais nos atendimentos odontológicos ambulatoriais na cidade de Manaus. Foram entrevistados 197 usuários do serviço odontológico, 150 Cirurgiões-Dentistas, e 47 comerciantes credenciados na prefeitura Municipal de Manaus. A amostragem foi realizada por acessibilidade ou conveniência para os Cirurgiões-Dentistas, enquanto os usuários foram selecionados através de amostragem aleatória simples, e os comerciantes de plantas medicinais foram entrevistados em sua totalidade. Os resultados demonstraram a existência de comercialização de plantas medicinais para patologias orais, destacando-se as seguintes espécies: Pedra ume cãa (Aulomyrcia sphareocarpa, Crajiru (Arrabidae chica, além da planta, sem identificação botânica, conhecida popularmente como Sara tudo. Entre os Cirurgiões-Dentistas e entre os pacientes, apenas 8% e 7,61%, respectivamente, utilizaram plantas medicinais para alterações patológicas orais. Os autores concluíram que as plantas medicinais comercializadas na cidade de Manaus são utilizadas de maneira empírica e que, apesar da Política Nacional de Práticas Integrativas e Complementares (PNPIC, novas políticas públicas de saúde devem inserir plantas medicinais e fitoterápicos de uso oral na rede pública de saúde na

  19. Linguagens na TV Languages on tv

    Directory of Open Access Journals (Sweden)

    Glaucia Guimarães

    2008-06-01

    Full Text Available Este artigo aborda questões relativas às estratégias discursivas utilizadas na produção dos textos televisivos. Com base na Análise Crítica de Discurso (ACD, nos termos em que é formulada por Norman Fairclough, o trabalho analisa os modos pelos quais as linguagens (incluindo materiais semióticos diversos são articuladas na/pela TV, sistematiza as relações entre a articulação de linguagens e a produção de efeitos de sentido, bem como os modos de sua inscrição nas tendências discursivas contemporâneas, a saber: democratização, tecnologização e comodificação. A partir das relações entre as práticas de linguagem e as tendências destacadas, o artigo tece considerações sobre as condições de produção de leituras críticas dos textos multimidiáticos, nas suas múltiplas dimensões: dos contextos e mecanismos da produção textual à pluralidade constitutiva de sua recepção.This paper deals with issues related to discursive strategies in the production of TV texts. Based on Critical Discourse Analysis (CDA, as formulated by Norman Fairclough, it analyzes the ways languages (including several semiotic materials are articulated in order to produce a range of wanted meaning effects, as well as the ways they are inscribed in the contemporary discursive trends discussed by the author, namely: democratization, technologization and commodification. Departing from the analysis of language practices and the discursive trends underlined, the paper aims at clarifying the multiple dimensions of multimedia conditions of production, focusing on both the context and the mechanisms and the diverse reception (reading possibilities.

  20. NaI(Tl) response functions

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H. R.; Ortiz R, J. M. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Benites R, J. L. [Centro Estatal de Cancerologia de Nayarit, Calz. de la Cruz 118 Sur, Tepic, Nayarit (Mexico); De Leon M, H. A., E-mail: fermineutron@yahoo.com.mx [Instituto Tecnologico de Aguascalientes, Av. Adolfo Lopez Mateos 1801 Ote., 20155 Aguascalientes, Ags. (Mexico)

    2015-09-15

    The response functions of a NaI(Tl) detector have been estimated using Monte Carlo methods. Response functions were calculated for monoenergetic photon sources (0.05 to 3 MeV). Responses were calculated for point-like sources and for sources distributed in Portland cement cylinders. The responses were used to calculate the efficiency functions in term of photon energy. Commonly, sources used for calibration are point-like, and eventually sources to be measured have different features. In order to use the calibrated sources corrections due to solid angle, self-absorption and scattering, must be carried out. However, some of these corrections are not easy to perform. In this work, the calculated responses were used to estimate the detector efficiency of point-like sources, and sources distributed in Portland type cement. Samples of Portland paste were prepared and were exposed to photoneutrons produced by a 15 MV linac. Some of the elements in the cement were activated producing γ-emitting radionuclides that were measured with a NaI(Tl) gamma-ray spectrometer, that was calibrated with point-like sources. In order to determine the specific activity in the induced radioisotopes calculated efficiencies were used to make corrections due to the differences between the solid angle, photon absorption and photon scattering in the point-like calibration sources and the sources distributed in cement. During the interaction between photoneutrons and the cement samples three radioisotopes were induced: {sup 56}Mn, {sup 24}Na, and {sup 28}Al. (Author)

  1. ORGANIZIRANJE IN PROMOVIRANJE TURIZMA NA PTUJSKEM

    OpenAIRE

    Mešl, Mitja

    2011-01-01

    Turizem predstavlja pomembno razvojno in poslovno priložnost za Ptuj. Potrebno je razumeti novo vlogo strategije razvoja turizma, poznati svetovne trende, si zadati novo vizijo in pričeti z izvajanjem ukrepov za uresničevanje postavljenih ciljev. Postaja dejavnost, ki omogoča razvoj, zaposlovanje, zaslužek in socialno varnost, predvsem, če upoštevamo, da večina dejavnosti sodeluje v turistični ponudbi. S takim pogledom pa ima vsak kraj možnost za večji razvoj turizma. Ptuj, naše najstarejš...

  2. ANALIZA KOMUNIKACIJSKIH PROTOKOLOV NA PLATFORMI ARM

    OpenAIRE

    Vegan, Janez

    2015-01-01

    Magistrsko delo obravnava zajem, analizo in prikaz signalov različnih komunikacijskih protokolov v realnem času. Podrobno so predstavljena strojna in programska oprema ter razvojna okolja, s pomočjo katerih smo realizirali sistem za analizo protokolov. V okviru magistrskega dela smo razvili program za platformo ARM, ki na LCD-zaslonu v realnem času prikazuje vsebino zajetih podatkov po protokolih IR (SIRC, NEC, RC6), I2C, SPI in UART. Razvili smo tudi program za stm32F100, ki oddaja v protoko...

  3. Ekstremni primjer izgaranja na poslu - sindrom karoshi

    OpenAIRE

    Koić, Elvira; Poredoš Lavor, Daša

    2009-01-01

    Karoshi sindrom je pojam kojim se označava ekstremni negativni stres i izgaranje na poslu koje rezultira iznenadnom smrti, a što se povezuje s prekomjernim radom, kompliciranim i previsokim zahtjevima koji se postavljaju radniku i izostankom adekvatne socijalne podrške, a često se povezuje i sa sindromom mobinga. Srčani ili moždani udar ili suicidalni izlaz, uzrokovani nakupljenim negativnim stresom zbog "predoziranja poslom", najčešća su posljedica. Iznenadnoj smrti često prethodi kronični u...

  4. Radioekologija mora i upravljanje otpadom na Jadranu

    OpenAIRE

    Franić, Zdenko; Petrinec, Branko

    2006-01-01

    Dan je pregled i opis radioekoloških istraživanja jadranskog područja koja provodi Jedinica za zaštitu od zračenja Instituta za medicinska istraživanja i medicinu rada. Mjerenja radioaktivnosti na Jadranu započela su godine 1963. kao dio proširenog programa monitoringa radioaktivnosti okoliša u Hrvatskoj. Glavni izvori radioaktivne kontaminacije Jadranskog mora jesu fallout (radioaktivni ispadak) prouzročen atmosferskim probama nuklearnog oružja te čornobiljska nesreća. Godine 2005. koncentra...

  5. Cerenkov counter for the experiment NA3

    CERN Multimedia

    1978-01-01

    The program of the NA3 experiment included the study of hadronic interactions with a large transverse momentum pT, thus the inclusion in the set-up of three gas threshold Cerenkov counters of large acceptance. The photo shows the downstream part of the second Cerenkov (located at the output of the magnet). The yellow membrane is a temporary protection for the optics (shown in photo 7810540X) to be taken away when fixing this part to the gas tank (entering the magnet and not shown). The photomultipliers all around are heavily shielded.

  6. VGRAJEN SISTEM UPRAVLJANJA VRAT NA DALJAVO

    OpenAIRE

    Stojak, Aleš

    2016-01-01

    V danem diplomskem delu je bil razvit in izveden vgrajen sistem za upravljanje vrat na daljavo. Za ta namen je uporabljen 32-bitni mikrokrmilnik. Kateri služi kot spletni strežnik in upravlja z vhodno/izhodnimi moduli. Vgrajen sistem vključno s kamero je razvit za uporabo v 12 V in 24 V sistemih motoriziranih vrat in alarmnih sistemih. Spletna stran ponuja funkcije, katere omogočajo upravljanje vrat, alarmnega sistema in konfiguracijo vgrajenega sistema. Ogled slike v živo je vgrajen v spl...

  7. impacto na saúde oral

    OpenAIRE

    Silva, Bruna Loureiro Oliveira de Sousa e

    2012-01-01

    Os distúrbios alimentares traduzem-se em comportamentos, quer pela falta, quer pelo excesso da ingestão de alimentos O crescente aumento destes distúrbios, nomeadamente a obsessão pelos corpos magros, relaciona-se com o impacto que os media tem na sociedade, uma vez que a magreza é vista como mecanismo de atração sexual e mecanismo de integração social. Das desordens alimentares fazem parte a anorexia nervosa, a bulimia nervosa e a obesidade. Ao contrário da obesidade, a anorexia ne...

  8. Vpliv verske prakse na zdravje ljudi

    OpenAIRE

    Petak, Kornelija Kristina

    2013-01-01

    Poznavanje različnih religij, in njihovih stališč do zdravja omogoča zdravstvenim delavcem lažje komuniciranje s pacienti ter pripomore k njihovi celostni obravnavi. Namen diplomskega dela je predstaviti odnos islama, judovstva in krščanstva do zdravega življenjskega sloga ter ugotoviti, kakšen vpliv imajo prakse teh religij na zdravje ljudi. Diplomsko delo je teoretično, uporabili smo deskriptivno metodo dela. S pregledom domače in tuje literature, dostopnih elektronskih virov ter rezultatov...

  9. Cidade-ciborgue: a cidade na cibercultura

    OpenAIRE

    André Lemos

    2008-01-01

    As cidades contemporâneas passam por transfigurações importantes com o advento das novas tecnologias da comunicação e informação e, embora toda cidade seja um artefato complexo composto por diversas redes materiais e espirituais (Saint Simon), podemos ver as atuais cidades como uma cidade-ciborgue. O objetivo deste artigo é descrever e analisar as principais transformações pelas quais passa o espaço urbano na atual cibercultura. Torna-se urgente compreender as transfo...

  10. Ensino de geometria descritiva: inovando na metodologia

    Directory of Open Access Journals (Sweden)

    Regina Coeli Moraes Kopke

    2001-03-01

    Full Text Available Com base na observação, durante anos de magistério superior, na área de desenho, dos alunos de Engenharia, Matemática, Arquitetura e Artes, quanto às dificuldades encontradas por eles no aprendizado de desenho, em especial da Geometria Descritiva, é que nos propusemos, em 1999, lecionar essa disciplina para os cursos de Arquitetura e Artes, adotando uma metodologia diferente da convencional, para despertar, no aluno, o gosto pela disciplina e o desenvolvimento de uma habilidade pouco trabalhada na escola: a visão espacial. Mostrar para os alunos que essa disciplina não é difícil, mas apenas diferente daquilo que estudaram até então, tornou-se nossa meta. A visão espacial é uma habilidade mental localizada no lado direito do cérebro e, assim, quanto mais lúdica for esta aprendizagem, será mais bem assimilada. A proposta é iniciada no sentido de se trabalhar primeiro com sólidos: neles estarão os pontos, retas e planos normalmente abordados na metodologia convencional, nessa ordem. Como conclusão, tem-se que o importante é ressaltar o grande avanço que a Geometria Descritiva traz para quem quer representar graficamente qualquer coisa. Onde há planejamento, projeto e representação gráfica, aí estará a Geometria Descritiva.During many years observing the teaching of design at the Engineering, Mathematics, Architeture and Arts courses, we can note the difficulties of the students to learn it, specially the descriptive geometry. Because of that, we decided to teach this discipline to the Architeture and Arts courses, using a new metodology to make the students motivated to study and to learn, and trying to develop their their spatial vision. We want to show to the students that this discipline is not so difficult as they think, but show them that is only different. The spatial vision is a mental skill found at the right side of the brain and the more soft the learning is, the more it is assimilated by the brain. The

  11. Necrose Intestinal na Criança

    OpenAIRE

    Martins, P.; Goulão, J.; Duarte, R

    2000-01-01

    O termo necrose intestinal traduz exclusivamente um conceito anatomopatológico e clínco, e implica sempre um isquémia instestinal oclusiva ou não. A enterocolite necrosante, em sentido lato, implica uma isquémia intestinal não oclusiva associada a um mecanismo infeccioso. O factor desencadeante da necrose é, por vezes, difícil de determinar. A enterocolite necrosante ocorre em 90% dos casos em recém-nascidos prematuros, sendo mesmo frequente no recém-nascido de termo e rara na crança mais vel...

  12. Vliv rotace pneumatiky na aerodynamiku automobilu

    OpenAIRE

    Oboňa, Matúš

    2015-01-01

    Cieľom tejto bakalárskej práce je popis vplyvu rotácie pneumatiky na aerodynamiku automobilu. Popisuje rozdiely medzi zjednodušenými tvarmi pneumatík obvykle používanými pre CFD a realistickým tvarom pneumatiky. V práci je ďalej analyzovaný vplyv jednotlivých prvkov dezénu a ich vzájomná interakcia, vplyv rôznych pneumatík a rôznych typov karosérii.

  13. Centralni nadzorni sistem na medicinski fakulteti

    OpenAIRE

    Kovačič, Matej

    2015-01-01

    V diplomski nalogi obravnavamo problem postavitve in delovanja centralnega nadzornega sistema (CNS) na Inštitutu za biokemijo in Inštitutu za biologijo celice Univerze v Ljubljani Medicinske fakultete. CNS povezuje sistem splošnega prezračevanja ter prezračevanja čistih prostorov, ogrevanja in hlajenja, razsvetljave, merjenja porabe električne energije ter sistem odklepanja vrat interlock. Pri tem so opisani posamezni sistemi različnih proizvajalcev, ki so povezani v skupno komunikacijsko omr...

  14. ANALIZA ISPLATIVOSTI UGRADNJE TURBOGENERATORA NA BROD

    OpenAIRE

    Bernečić, Dean; Orović, Josip

    2011-01-01

    U radu su prikazani rezultati provedene simulacije i istraživanja isplativosti ugradnje turbogeneratora na brod. Analiza je provedena primjenom NOR Controlovog simulatora za simulaciju brodskog postrojenja tankera za prijevoz sirove nafte. Simulirana je proizvodnja električne energije s turbogeneratorom ili s dizelskim generatorom. Analiza početnih investicijskih troškova provedena je anketom s proizvođačem brodskih generatora pare te s dobavljačima turbo i dizelskih generatora pri čemu su se...

  15. Osvrt na razvoj sestrinstva u Koprivnici

    OpenAIRE

    Švarc, Krešimir; Švarc Janjanin, Sanja

    2007-01-01

    Nakon osvrta na prvobitnu skrb za oboljele, za koju su bile zadužene nekvalificirane osobe, opisuje se bitna promjena u njezi dolaskom prvih Časnih sestara milosrdnica i njihova velika važnost. Slijedi dolazak i prvih medicinskih sestara te njihov rad uz krevet bolesnika, ali i njihova prva djelovanja u preventivnim aktivnostima. Posebno je obrađena ličnost m. s. Marije Brozović te njezin rad u Školskoj poliklinici, poslije osnivačice i prve ravnateljice Bolničarske škole, zatim glavne sestre...

  16. DESENVOLVIMENTO MORAL E INDISCIPLINA NA ESCOLA

    Directory of Open Access Journals (Sweden)

    Rita Melissa Lepre

    2009-12-01

    Full Text Available O presente artigo configura-se como uma reflexão acerca da indisciplina e suas possíveis causas. Para debater sobre o assunto apresentamos a teoria do desenvolvimento moral de Jean Piaget e articulamos suas descobertas com a questão da indisciplina na escola. São feitas, ainda, reflexões sobre o ambiente em que nossas crianças encontram-se inseridas por, pelo menos, cinco horas diárias.

  17. VPLIV MEDIJEV NA GIBALNO DEJAVNOST OTROK

    OpenAIRE

    Bodner, Natalija

    2012-01-01

    Diplomsko delo z naslovom Vpliv medijev na gibalno dejavnost otrok je teoretično in predstavlja spremembe, ki jih mediji prinašajo v gibanje otrok. V okviru gibanja so predstavljene gibalne sposobnosti otrok in gibalna dejavnost oziroma aktivnost otrok. Razložen je pomen gibanja za otroke, tako v naravi kot tudi skozi igro, ter katera dejavnost je še zlasti pomembna, ko govorimo o gibanju in ukvarjanju s športom otrok in malčkov. Predstavljene so prednosti, ki jih gibanje prinaša, in kakšen ž...

  18. Strojni vid na masivno vzporedni vgradni arhitekturi

    OpenAIRE

    TUŠAR, GREGOR

    2015-01-01

    Zaradi stalnega večanja potreb po računski moči, se poleg klasičnih razvijajo novi pristopi računanja. Za reševanje računalniških problemov se ob običajnih procesorjih vedno pogosteje uporabljajo modernejše masivno vzporedne arhitekture. V delu je predstavljen kratek zgodovinski pregled razvoja in njihovih značilnosti. Opisane so teoretične zakonitosti in omejitve. V drugem delu je prikazan praktični primer aplikacije industrijskega strojnega vida in meritve hitrosti določenih funkcij na...

  19. Reakcije preosjetljivosti na jodne kontrastne medije

    OpenAIRE

    Plazonić, Željko; Batinac, Tanja; Bukvić, Marija

    2016-01-01

    Jodni kontrastni mediji uporabljuju se pri rentgenskim postupcima te mogu izazvati neposredne i odgođene reakcije preosjetljivosti. Zbog njihove povećane primjene, reakcije preosjetljivosti također su u porastu. Nakon uvođenja neionskih, niskoosmolarnih kontrastnih medija, smanjio se broj reakcija preosjetljivosti, no moguće teške reakcije, kao što je anafilaksija, i dalje su ozbiljan problem. Radiolozi i kardiolozi trebaju imati na umu da dosad neizloženi pacijenti mogu već imati razvijenu o...

  20. Status of the NA62 Experiment

    Science.gov (United States)

    Palladino, Vito

    2016-04-01

    The rare decays {{{K}}^ + } to {π ^ + }{{ν bar ν }} are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleaness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The physics prospects and the status of the experiment will be reviewed after the commissioning run of 2014 and the data taking in 2015.

  1. Respiratorna funkcija radnica na proizvodnji slastica

    OpenAIRE

    Žuškin, E.; Mustajbegović, J.; Kanceljak, B; Dečković-Vukres, V.; Turčić, N.

    1993-01-01

    Respiratorni simptomi i ventilacijska funkcija pluća ispitivani su u 259 radnica na preradi slastica i 65 radnica neizložene kontrolne skupine. Većina kroničnih respiratornih simptoma bila je viša u izloženih nego u radnica kontrolne skupine, osobito u izloženosti brašnu, talku i škrobu te parama kiselina i etilnog alkohola. Utvrđena je visoka prevalencija akutnih simptoma koji se razvijaju tijekom radne smjene, osobito kašalj, dispneja, pečenje i suhoća grla te iritacija očiju. U svim skupin...

  2. As redes sociais online na hotelaria

    OpenAIRE

    Cantinho, Gonçalo Molarinho Reis

    2016-01-01

    Dissertação de Mestrado, Direção e Gestão Hoteleira, Escola Superior de Gestão, Hotelaria e Turismo, Universidade do Algarve, 2016 As empresas hoteleiras deparam-se, na atualidade, com um mercado cada vez mais competitivo e com as novas tecnologias da informação e comunicação, nomeadamente, a internet e a Web 2.0. que criaram novas oportunidades para a indústria hoteleira, entre as quais se destacam os sites de redes sociais, que permitem aos clientes estarem cada vez mais informados e mai...

  3. Sprejem agresivnega pacienta na oddelek za psihiatrijo

    OpenAIRE

    Horvat, Andrej

    2014-01-01

    Agresija in nasilje predstavljata velik problem v družbi. Agresija se lahko izrazi v različnih oblikah, od blagih, kot je povzdignjen glas, pa vse do nenadnega fizičnega napada. Najpogosteje je prisotna verbalna agresija, kot so grožnje, izzivanja. Agresivni izbruhi imajo neugoden vpliv na zdravje, varnost in dobro počutje ostalih pacientov in oddelčnega osebja. Medicinske sestre in zdravstveni tehniki imajo visoko stopnjo tveganja, da so žrtve agresivnega vedenja s strani pacientov. V diplom...

  4. Sindromi prenaprezanja na potkoljenici i stopalu

    OpenAIRE

    SMERDELJ, MIROSLAV; Madjarević, Mladen; OREMUŠ, KREŠIMIR

    2002-01-01

    U radu autori opisuju i objašnjavaju nastanak bolnih sindroma u području potkoljenice i stopala, vezanih uz profesiju odnosno sportsku aktivnost. Iznose se zapažanja i iskustva iz svakodnevne liječničke prakse, a i podaci iz novije medicinske literature. Značenje se daje liječenju koje je obično konzervativno, a od kirurških metoda naglasak se daje na nove manje invazivne metode. U radu su opisani najčešći sindromi prenaprezanja u području potkoljenice kao što su trkačka potkoljenica, sindrom...

  5. AVTOMATIZACIJA VODENJA DOKUMENTACIJE O DELU NA PROJEKTIH

    OpenAIRE

    Jurman Golja, Dunja

    2009-01-01

    Namen diplomske naloge je predstaviti primer uporabe in prilagoditve odprtokodne rešitve za vodenje projektov. Podjetje ComCom d.o.o. se ukvarja s programiranjem, njihovo delo pa je pretežno projektno organizirano, zato je v nalogi predstavljen projektni način dela, opisana je kratka zgodovina odprte kode, njene prednosti in slabosti ter programski jezik Python, v katerem je tudi napisana spletna rešitev Trac za vodenje projektov. S predstavljeno rešitvijo smo želeli podjetju ComCom d.o.o....

  6. Probing luminescence centers in Na rich feldspar

    DEFF Research Database (Denmark)

    Prasad, Amit Kumar; Lapp, Torben; Kook, Myung Ho;

    2016-01-01

    In contrast to the detailed investigations on the dosimetric electron trap in feldspar only little has been done to understand the luminescence centers. We use a comparison of multiple spectroscopic techniques, site selective photoluminescence spectroscopy and time resolved measurements to further...... our understanding of the luminescence mechanisms and recombination sites, in a sample of Na rich plagioclase feldspar (oligoclase). Both the UV and violet–blue emissions show resonant excitations arising from a distribution of energy levels. We propose, contrary to the general understanding...

  7. 四元体系NaCl-NaBr-Na2SO4-H2O348K相平衡研究%Study on Phase Equilibria for Quaternary System of NaCl-NaBr-Na2SO4-H2O at 348 K

    Institute of Scientific and Technical Information of China (English)

    张勇刚; 桑世华; 张凯杰; 胡富铭; 崔瑞芝

    2013-01-01

    The phase equilibria of the quaternary system of NaCl - NaBr - Na2SO4 - H2O at 348 K are investigated, and the solubility and density of the solution are determined by isothermal e-quilibrium method. The experimental results indicate that the quaternary system is the system with solid in the solution. Based on the experimental data, the phase diagram of the quaternary system is plotted, which consists of a univariant dissolution curve and two crystallization fields: Na ( Cl 、Br) and Na2SO4. The experimental results show that the sodium bromide has the salting - out effect on sodium chloride. Meanwhile, the rule of density is discussed briefly.%采用等温溶解平衡法研究了348 K下四元体系NaCl-NaBr-Na2 SO4-H2O的相平衡规律,测定了平衡液相的溶解度和密度.研究发现,四元体系NaCl-NaBr-Na2SO4-H2O是含有固体溶液的体系.根据实验研究数据绘制了等温溶解度图,相图中只有一条单变量溶解曲线,两个结晶相区,平衡固相分别为Na(Cl、Br)和Na2SO4.实验结果表明,NaBr对NaCl具有盐析效应,并简要讨论了密度变化规律.

  8. Dependence of thermoluminescence in LiF:Mg,Cu,Na,Si phosphor on Na dopant concentration and thermal treatment

    International Nuclear Information System (INIS)

    A new phosphor, LiF:Mg,Cu,Na,Si, has been developed in this laboratory for thermoluminescence. The thermoluminescence dependence on the concentration of Na dopant between 0 mol% and 0.45 mol% and thermal treatment between 240 deg. C and 310 deg. C was investigated. With an increase of Na concentration, the TL sensitivity and the main peak increase when the annealing temperature is less than 300 deg. C. With an increase of annealing temperature, the position of the main glow peak shifts markedly towards higher temperatures, irrespective of Na concentrations. The height of the main peak depends strongly on the annealing temperature. TL sensitivity remains stable at annealing temperatures from 260 deg. C to 300 deg. C for 0 mol% Na concentration, from 250 deg. C to 300 deg. C for 0.05 mol% N concentration, from 260 deg. C to 290 deg. C for 0.1 mol% Na concentration, from 260 deg. C to 280 deg. C for 0.2 mol% Na concentration, from 250 deg.C to 270 deg. C for 0.35 mol% Na concentration, or from 260 deg. C to 280 deg. C for 0.45 mol% Na concentration. The ratio of the intensity annealed at 310 deg. C to the intensity annealed at 260 deg. C seems to be reduced with an increase of Na concentration. Thermal susceptibility of LiF:Mg,Cu,Na,Si appears to be associated with the Na concentration. The lower the Na concentration, the less sensitive the TL is to annealing temperature. The optimum Na dopant concentration was found to be 0%

  9. Hydrogen sulfide induced disruption of Na+ homeostasis in the cortex.

    Science.gov (United States)

    Chao, Dongman; He, Xiaozhou; Yang, Yilin; Balboni, Gianfranco; Salvadori, Severo; Kim, Dong H; Xia, Ying

    2012-07-01

    Maintenance of ionic balance is essential for neuronal functioning. Hydrogen sulfide (H(2)S), a known toxic environmental gaseous pollutant, has been recently recognized as a gasotransmitter involved in numerous biological processes and is believed to play an important role in the neural activities under both physiological and pathological conditions. However, it is unclear if it plays any role in maintenance of ionic homeostasis in the brain under physiological/pathophysiological conditions. Here, we report by directly measuring Na(+) activity using Na(+) selective electrodes in mouse cortical slices that H(2)S donor sodium hydrosulfide (NaHS) increased Na(+) influx in a concentration-dependent manner. This effect could be partially blocked by either Na(+) channel blocker or N-methyl-D-aspartate receptor (NMDAR) blocker alone or almost completely abolished by coapplication of both blockers but not by non-NMDAR blocker. These data suggest that increased H(2)S in pathophysiological conditions, e.g., hypoxia/ischemia, potentially causes a disruption of ionic homeostasis by massive Na(+) influx through Na(+) channels and NMDARs, thus injuring neural functions. Activation of delta-opioid receptors (DOR), which reduces Na(+) currents/influx in normoxia, had no effect on H(2)S-induced Na(+) influx, suggesting that H(2)S-induced disruption of Na(+) homeostasis is resistant to DOR regulation and may play a major role in neuronal injury in pathophysiological conditions, e.g., hypoxia/ischemia.

  10. A biotecnologia na agropecuária

    Directory of Open Access Journals (Sweden)

    João Lúcio de Azevedo

    1986-11-01

    Full Text Available This review reports the use of biotechnology in agriculture and animal husbandry. The main techniques and the most important products both in experimental stage or in commercial use are reported. The work intends to give a global vision to the theme, chronologically and spacely, showing the main lines of research and what has been obtained in this area. The techniques and products that are related to genetics and breeding are emphasized. Revisão Bibliográfica do emprego da biotecnologia na agropecuária, mostrando um levantamento das técnicas mais promissoras e de seus principais produtos, tanto em fase experimental como em uso comercial. Pretende-se dar uma visão global do assunto, cronológica e espacialmente, não se prendendo à detalhes, mostrando, em Unhas gerais, o que foi feito e o que se faz, atualmente, em biotecnologia. As técnicas e produtos que influenciam a área de genética e melhoramento genético na agropecuária, são enfatizadas.

  11. Plantas indicadoras de clomazone na fase vapor

    Directory of Open Access Journals (Sweden)

    Fábio Schreiber

    2013-10-01

    Full Text Available A volatilização representa um processo importante no deslocamento de agrotóxicos para o ambiente. As características físico-químicas da molécula do clomazone indicam que este possui potencial de volatilização. Em vista do exposto, para a realização deste estudo, foram conduzidos dois experimentos com o objetivo de avaliar a suscetibilidade das espécies: pepino, melão, milho, sorgo e arroz a diferentes formulações do herbicida clomazone na fase vapor. Para isso, foram utilizadas caixas de vidro hermeticamente fechadas, com a presença de diferentes formulações de clomazone e as espécies vegetais. As formulações utilizadas foram Gamit 360 CS®, Gamit 500 EC® e Gamit Star®. Com os resultados obtidos, foi possível concluir que, dentre as espécies avaliadas, independente da formulação utilizada, a de menor tolerância ao herbicida clomazone na fase vapor foi o sorgo, seguido do milho e do arroz.

  12. Mercosul educativo na carreira de Enfermagem

    Directory of Open Access Journals (Sweden)

    Roseli Schmoeller

    2012-10-01

    Full Text Available O Mercosul, instituído com vistas à integração econômica, política, social e cultural entre os países membros, atualmente destaca-se pelas estratégias integrativas de âmbito educacional. Este artigo aborda os movimentos acerca da formação acadêmica dos cursos de Enfermagem e o trajeto histórico de integração educacional, apresentando o Sistema de Acreditação dos Cursos Universitários do Mercosul, o ARCU-SUL, além dos setores responsáveis por esse processo e as perspectivas para a Enfermagem nos países do Mercosul. Entendemos que para o desenvolvimento de profissionais críticos, reflexivos e com compromisso político-social, é fundamental investir na formação e na qualidade dos centros de ensino em Enfermagem.

  13. Cenová politika na Internetu

    OpenAIRE

    Lohr, Karel

    2006-01-01

    Práce porovnává cenovou politiku na Internetu s cenovou politikou v klasickém pojetí v kamenných obchodech. Popisuje vliv internetového prostředí na tradiční nástroje cenové politiky. Rozebírá nejdůležitější faktory ovlivňující tvorbu cen a analyzuje cenové strategie. Předmětem práce jsou také nástroje cenové politiky, které jsou specifické pro Internet (dynamické ceny, komparativní nakupování apod.). Práce obsahuje některé příklady z praxe a zabývá se také elektronickými platebními systémy (...

  14. Vinhos, Turismo e Pluriatividade na Agricultura

    Directory of Open Access Journals (Sweden)

    Hernanda Tonini

    2013-06-01

    Full Text Available A gastronomia, além de ter importante relação com a economia, é uma forma expressiva da cultura dos indivíduos, desde o tipo de alimentos cultivados até a maneira de seu preparo e consumo. O presente artigo propõe-se a analisar a relação entre o enoturismo – centralizado na existência do vinho enquanto elemento gastronômico – e o fenômeno da pluriatividade na agricultura familiar, vista nos últimos anos como alternativa positiva para sua reprodução econômica e social. O fluxo turístico em regiões vitivinícolas gera novas oportunidades de trabalho e faz com que agricultores e suas famílias dividam a mão de obra agrícola, até então direcionada ao cultivo da uva e outros alimentos para subsistência, com atividades não agrícolas – como o artesanato, o acolhimento de visitantes em pousadas, a atuação em restaurantes, entre outras – como chance de subsistência. Este panorama transforma as realidades do mundo rural, alterando a relação do agricultor com a produção de alimentos e a forma como o mesmo os utiliza, além de reestruturar o ambiente sociocultural no seu entorno.  

  15. Hadron production measurement from NA61/SHINE

    CERN Document Server

    Korzenev, A

    2013-01-01

    New results of NA61/SHINE on determination of charged hadron yields in proton-carbon interactions are presented. They aim to improve predictions of the neutrino flux in the T2K experiment. The data were recorded using a secondary-proton beam of 31 GeV/$c$ momentum from CERN SPS which impinges on a graphite target. To determine the inclusive production cross section for charged pions, kaons and protons the thin ($0.04\\, \\lambda_I$) target was exploited. Results of this measurement are used in the T2K beam simulation program to reweight hadron yields in the interaction vertex. At the same time, NA61/SHINE results obtained with the T2K replica target ($1.9\\, \\lambda_I$) allow to constrain hadron yields at the surface of the target. It would correspond to the constraint up to 90% of the neutrino flux, thus reducing significantly a model dependence of the neutrino beam prediction. All measured spectra are compared to predictions of hadron production models. In addition a status of the analysis of data collected by...

  16. Apical Na+ permeability of frog skin during serosal Cl- replacement.

    Science.gov (United States)

    Leibowich, S; DeLong, J; Civan, M M

    1988-05-01

    Gluconate substitution for serosal Cl- reduces the transepithelial short-circuit current (Isc) and depolarizes short-circuited frog skins. These effects could result either from inhibition of basolateral K+ conductance, or from two actions to inhibit both apical Na+ permeability (PapNa) and basolateral pump activity. We have addressed this question by studying whole-and split-thickness frog skins. Intracellular Na+ concentration (CcNa) and PapNa have been monitored by measuring the current-voltage relationship for apical Na+ entry. This analysis was conducted by applying trains of voltage pulses, with pulse durations of 16 to 32 msec. Estimates of PapNa and CcNa were not detectably dependent on pulse duration over the range 16 to 80 msec. Serosal Cl- replacement uniformly depolarized short-circuited tissues. The depolarization was associated with inhibition of Isc across each split skin, but only occasionally across the whole-thickness preparations. This difference may reflect the better ionic exchange between the bulk medium and the extracellular fluid in contact with the basolateral membranes, following removal of the underlying dermis in the split-skin preparations. PapNa was either unchanged or increased, and CcNa either unchanged or reduced after the anionic replacement. These data are incompatible with the concept that serosal Cl- replacement inhibits PapNa and Na,K-pump activity. Gluconate substitution likely reduces cell volume, triggering inhibition of the basolateral K+ channels, consistent with the data and conclusions of S.A. Lewis, A.G. Butt, M.J. Bowler, J.P. Leader and A.D.C. Macknight (J. Membrane Biol. 83:119-137, 1985) for toad bladder. The resulting depolarization reduces the electrical force favoring apical Na+ entry. The volume-conductance coupling serves to conserve volume by reducing K+ solute loss. Its molecular basis remains to be identified. PMID:2458472

  17. Apical Na+ permeability of frog skin during serosal Cl- replacement.

    Science.gov (United States)

    Leibowich, S; DeLong, J; Civan, M M

    1988-05-01

    Gluconate substitution for serosal Cl- reduces the transepithelial short-circuit current (Isc) and depolarizes short-circuited frog skins. These effects could result either from inhibition of basolateral K+ conductance, or from two actions to inhibit both apical Na+ permeability (PapNa) and basolateral pump activity. We have addressed this question by studying whole-and split-thickness frog skins. Intracellular Na+ concentration (CcNa) and PapNa have been monitored by measuring the current-voltage relationship for apical Na+ entry. This analysis was conducted by applying trains of voltage pulses, with pulse durations of 16 to 32 msec. Estimates of PapNa and CcNa were not detectably dependent on pulse duration over the range 16 to 80 msec. Serosal Cl- replacement uniformly depolarized short-circuited tissues. The depolarization was associated with inhibition of Isc across each split skin, but only occasionally across the whole-thickness preparations. This difference may reflect the better ionic exchange between the bulk medium and the extracellular fluid in contact with the basolateral membranes, following removal of the underlying dermis in the split-skin preparations. PapNa was either unchanged or increased, and CcNa either unchanged or reduced after the anionic replacement. These data are incompatible with the concept that serosal Cl- replacement inhibits PapNa and Na,K-pump activity. Gluconate substitution likely reduces cell volume, triggering inhibition of the basolateral K+ channels, consistent with the data and conclusions of S.A. Lewis, A.G. Butt, M.J. Bowler, J.P. Leader and A.D.C. Macknight (J. Membrane Biol. 83:119-137, 1985) for toad bladder. The resulting depolarization reduces the electrical force favoring apical Na+ entry. The volume-conductance coupling serves to conserve volume by reducing K+ solute loss. Its molecular basis remains to be identified.

  18. Aspectos valorizados por porfissionais de enfermagem na higiene pessoal e na higiene corporal do paciente

    Directory of Open Access Journals (Sweden)

    Elóide André Oliveira

    2003-10-01

    Full Text Available Survey descritivo, com o qual se objetivou identificar que aspectos da higiene corporal são valorizados pelos componentes da equipe de enfermagem, na higiene corporal pessoal e na higiene corporal do paciente. A pesquisa foi desenvolvida em oito instituições públicas de saúde e a amostra foi composta por 126 profissionais de enfermagem, correspondendo a 12,8% do total de 986 componentes das equipes de enfermagem destas instituições. Na higiene corporal pessoal, chamou a atenção o fato de que os cuidados com as unhas e com os cabelos tenham suplantado, no número de citações dos profissionais de enfermagem, aspectos básicos como o cuidado com as mãos. Na higiene corporal do paciente, o banho foi o aspecto considerado mais importante pelas três categorias profissionais; a higiene oral, pelas(os enfermeiras(os e auxiliares de enfermagem; e as unhas, pelas(os enfermeiras(os e técnicas(os de enfermagem.

  19. Decomposition Kinetics of Titania Slag in Eutectic NaOH-NaNO3 System

    Science.gov (United States)

    Wang, Dong; Wang, Zhi; Qi, Tao; Wang, Lina; Xue, Tianyan

    2016-02-01

    The decomposition kinetics and mechanism of titania slag in eutectic NaOH-NaNO3 system were studied in the temperature range 623 K to 723 K (350 °C to 450 °C). Decomposed products were examined using X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. It has been identified that the main product is Na2TiO3 and the decomposition kinetics of titania slag followed a shrinking unreacted core model. It is proposed that the chemical reaction process was the rate determining step with apparent activation energy of 62.4 kJ/mol. NaNO3 was mainly acted as oxygen carrier and mass transport agent to lower the viscosity of the system. The purity of TiO2 obtained in the product was up to 99.3 pct. A flow diagram to produce TiO2 and to recycle the media was proposed.

  20. Efeito do plasma de oxigênio na dentina previamente exposta ao NaOCl

    Directory of Open Access Journals (Sweden)

    Maíra do PRADO

    Full Text Available Resumo Introdução O tratamento de plasma é uma tecnologia eficaz que pode manter as propriedades internas dos materiais inalteradas após o tratamento, modificando apenas a superfície. Objetivo Avaliar o efeito do plasma de oxigênio na dentina previamente exposta ao NaOCl 6%. Material e método Foram utilizados 60 incisivos bovinos. A coroa foi removida, a raiz foi dividida e as faces planificadas, totalizando 120 segmentos referentes ao terço cervical. As amostras foram divididas em dois grupos: controle (imersa em NaOCl 6%, lavada com água destilada, seca, imersa em EDTA 17%, lavada e seca e plasma de oxigênio (após tratamento descrito no grupo controle, plasma de oxigênio foi aplicado por 30 s. As amostras foram avaliadas qualitativamente em relação à topografia por microscopia eletrônica de varredura, utilizando-se microfotografias com ampliação de 1.000×. O goniômetro Ramé-hart foi utilizado para a mensuração do ângulo de contato entre as superfícies e as seguintes soluções foram utilizadas: água, etilenoglicol e di-iodometano. Em seguida, a energia de superfície, representada pelas componentes polar e dispersiva, foi calculada. Avaliou-se também o escoamento dos cimentos Pulp Canal Sealer EWT (PCS e Real Sal SE (RS na superfície dentinária. Os dados foram analisados estatisticamente utilizando os testes Kruskal-Wallis e Mann-Whitney U (p<0,05. Resultado O tratamento com plasma levou à formação de uma camada semelhante à smear layer na superfície dentinária. Este tratamento levou a um aumento da energia de superfície e da componente polar, favorecendo a hidrofilicidade da superfície. Entretanto, desfavoreceu o escoamento do cimento PCS e não influenciou no escoamento do cimento RS. Conclusão O plasma de oxigênio ocasionou mudanças topográficas na superfície dentinária, favorecendo a hidrofilicidade desta. Contudo, não favoreceu o escoamento dos cimentos endodônticos na dentina.

  1. NaCl-preferring NZB/B1NJ Mice and NaCl-avoiding CBA/J Mice Have Similar Amiloride Inhibition of Chorda Tympani Responses to NaCl

    OpenAIRE

    Ninomiya, Yuzo; Bachmanov, Alexander A.; Yatabe, Akira; Gary K Beauchamp

    1998-01-01

    Integrated chorda tympani nerve responses to NaCl were studied in two mouse strains, an NaCl-preferring NZB/B1NJ and an NaCl-avoiding CBA/J. The NaCl responses of both strains had similar magnitude and were suppressed by amiloride to a similar extent. This suggests that peripheral gustatory responsiveness to NaCl is not the only mechanism underlying mouse strain variation in NaCl acceptance.

  2. Stimulation of Na+/K+ ATPase activity and Na+ coupled glucose transport by β-catenin

    International Nuclear Information System (INIS)

    Research highlights: → The oncogenic transcription factor β-catenin stimulates the Na+/K+-ATPase. → β-Catenin stimulates SGLT1 dependent Na+, glucose cotransport. → The effects are independent of transcription. → β-Catenin sensitive transport may contribute to properties of proliferating cells. -- Abstract: β-Catenin is a multifunctional protein stimulating as oncogenic transcription factor several genes important for cell proliferation. β-Catenin-regulated genes include the serum- and glucocorticoid-inducible kinase SGK1, which is known to stimulate a variety of transport systems. The present study explored the possibility that β-catenin influences membrane transport. To this end, β-catenin was expressed in Xenopus oocytes with or without SGLT1 and electrogenic transport determined by dual electrode voltage clamp. As a result, expression of β-catenin significantly enhanced the ouabain-sensitive current of the endogeneous Na+/K+-ATPase. Inhibition of vesicle trafficking by brefeldin A revealed that the stimulatory effect of β-catenin on the endogenous Na+/K+-ATPase was not due to enhanced stability of the pump protein in the cell membrane. Expression of β-catenin further enhanced glucose-induced current (Ig) in SGLT1-expressing oocytes. In the absence of SGLT1 Ig was negligible irrespective of β-catenin expression. The stimulating effect of β-catenin on both Na+/K+ ATPase and SGLT1 activity was observed even in the presence of actinomycin D, an inhibitor of transcription. The experiments disclose a completely novel function of β-catenin, i.e. the regulation of transport.

  3. Study on phase equilibria in Na2 B4 O7 -NaBr-Na2 SO4 -H2O quaternary system at 348 K%Na2B4O7-NaBr-Na2SO4-H2O四元体系348K相平衡研究

    Institute of Scientific and Technical Information of China (English)

    宁慧逸; 桑世华; 王丹; 曾晓晓

    2012-01-01

    采用等温溶解平衡法研究Na2B4O7 -NaBr-Na2SO4-H2O四元体系在348 K的相平衡关系,测定了平衡液相的溶解度和密度.根据实验数据绘制相应相图.该四元体系相图中有1个共饱点E,3条单变量曲线E1E,E2E,E3E,3个结晶区的平衡固相分别为:NaBr,Na2SO4和Na2B4O7 · 5H2O.研究结果表明:该四元体系无复盐和固溶体生成,属于简单四元体系,NaBr对Na2B4O7·5H2O和Na2SO4有较强的盐析作用.并对NaBr和Na2B4O7在不同温度下含有的结晶水数进行了对比分析,简要讨论了密度变化规律.%The solubilities and densities of solution in Na2B4O7-NaBr- Na2SO4-H2O quaternary system at 348 K were determined by isothermal equilibrium method. Based on the experimental data, the equilibrium phase diagram was plotted, which consists of one invariant E, three univariant curves (E1E, E2E and E3E) , and three crystallization fields corresponding to NaBr, Na2SO4 and Na2B4O7 ? 5H2O. The experimental results indicate that the quaternary system is of simple eutectic type and no double salt and solid solution, and sodium bromide has the salting-out effect on Na2B4O7 ? 5H2O and Na2SO4. The densities transformation rules were discussed.

  4. Coordinated regulation of cardiac Na(+)/Ca (2+) exchanger and Na (+)-K (+)-ATPase by phospholemman (FXYD1).

    Science.gov (United States)

    Cheung, Joseph Y; Zhang, Xue-Qian; Song, Jianliang; Gao, Erhe; Chan, Tung O; Rabinowitz, Joseph E; Koch, Walter J; Feldman, Arthur M; Wang, JuFang

    2013-01-01

    Phospholemman (PLM) is the founding member of the FXYD family of regulators of ion transport. PLM is a 72-amino acid protein consisting of the signature PFXYD motif in the extracellular N terminus, a single transmembrane (TM) domain, and a C-terminal cytoplasmic tail containing three phosphorylation sites. In the heart, PLM co-localizes and co-immunoprecipitates with Na(+)-K(+)-ATPase, Na(+)/Ca(2+) exchanger, and L-type Ca(2+) channel. The TM domain of PLM interacts with TM9 of the α-subunit of Na(+)-K(+)-ATPase, while its cytoplasmic tail interacts with two small regions (spanning residues 248-252 and 300-304) of the proximal intracellular loop of Na(+)/Ca(2+) exchanger. Under stress, catecholamine stimulation phosphorylates PLM at serine(68), resulting in relief of inhibition of Na(+)-K(+)-ATPase by decreasing K(m) for Na(+) and increasing V(max), and simultaneous inhibition of Na(+)/Ca(2+) exchanger. Enhanced Na(+)-K(+)-ATPase activity lowers intracellular Na(+), thereby minimizing Ca(2+) overload and risks of arrhythmias. Inhibition of Na(+)/Ca(2+) exchanger reduces Ca(2+) efflux, thereby preserving contractility. Thus, the coordinated actions of PLM during stress serve to minimize arrhythmogenesis and maintain inotropy. In acute cardiac ischemia and chronic heart failure, either expression or phosphorylation of PLM or both are altered. PLM regulates important ion transporters in the heart and offers a tempting target for development of drugs to treat heart failure.

  5. SPLETNO TRŽENJE NA PRIMERU MOBILNIH OPERATERJEV

    OpenAIRE

    Ribič, Janja

    2014-01-01

    V diplomski nalogi sem se odločila, da bom predstavila spletno trženje mobilnih operaterjev, ki postaja vse bolj pomembna in praktična spletna storitev, saj je pomembna oblika in vsebina spletnih tržnikov. Predstavila sem elektronsko poslovanje in spletno trženje mobilnih operaterjev. Opisala sem načine spletnega trženja, prednosti, načela in pogoje za uspešno spletno trženje.

  6. VPLIV STILOV VODENJA NA ZADOVOLJSTVO ZAPOSLENIH V ZDRAVSTVENI NEGI

    OpenAIRE

    Janžekovič, Katja

    2012-01-01

    Dobro vodenje je kot konstantno vrhunsko delovanje, ki ima pozitive dolgoročne učinke na vse zaposlene. Vodje niso samo tisti, ki kontrolirajo druge, ampak delujejo kot vizionarji, ki pomagajo zaposlenim, da planirajo, vodijo, kontrolirajo in organizirajo svoje delo. Namen. Ugotoviti prevladujoči stil vodenja v zdravstveni negi ter proučiti vpliv različnih stilov vodenja na zadovoljstvo zaposlenih v zdravstveni negi. Raziskovalna metodologija. Raziskava je temeljila na deskriptivni (...

  7. Razvoj suvremenog menadžmenta trgovine na malo

    OpenAIRE

    Segetlija, Zdenko

    2009-01-01

    Razvoj koncentracije u trgovini na malo doveo je do daljnjih promjena u njezinoj strukturi te, u skladu s tim, i do promjena u upravljanju gospodarskim subjektima u trgovini na malo. S tim u svezi mijenja se i dosadašnja paradigma marketinga trgovine na malo, budući da sve važnijim postaje oblikovanje asortimana temeljem programa category managementa i drugih oblika vertikalnoga marketinga. S druge pak strane, osim poznavanja zakonitosti razvoja novih oblika poslovnih jedinica, no...

  8. RAZVOJ SODOBNIH SPLETNIH APLIKACIJ NA OSNOVI ODPRTOKODNEGA OGRODJA LARAVEL

    OpenAIRE

    Vetršek, Rok

    2015-01-01

    V diplomskem delu sta podrobno predstavljeni odprtokodni ogrodji Bootstrap in Laravel. Prvo omogoča enostavno in hitro oblikovanje odzivnih spletnih aplikacij, drugo pa je eno od vodilnih ogrodij, ki temeljijo na jeziku PHP in MVC arhitekturi. Uporaba ogrodji je prikazana z izdelavo spletne aplikacije, ki omogoča vodenje preprostih zapiskov in deljenje le teh v obliki samo za branje. Aplikacija je dinamična in se prilagaja velikosti zaslona naprave, na kateri si jo ogledujemo. Iz pridobljenih...

  9. 三元体系NaBr-Na2SO4-H2O 和 NaBr-KBr-H2O 373 K相平衡%Phase Equilibria of Two Ternary Systems NaBr-Na2SO4-H2O and NaBr-KBr-H2O at 373 K

    Institute of Scientific and Technical Information of China (English)

    桑世华; 崔瑞芝; 胡咏霞

    2014-01-01

    针对川西盆地富硼钾溴地下卤水组成,采用等温溶解平衡法研究了三元体系 NaBr-Na2SO4-H2O 和NaBr-KBr-H2O在373 K时的相平衡,测定了373 K条件下平衡溶液的溶解度和密度,根据实验数据绘制相应的相图和密度图。研究发现:两个三元体系在373 K条件下均属于简单共饱和型,无复盐及固溶体生成。相图中均有一个共饱和点,2个平衡固相结晶区和2条单变量曲线。在三元体系NaBr-Na2SO4-H2O中,平衡固相分别为:NaBr和Na2SO4,三元体系NaBr-KBr-H2O相应的平衡固相分别为:NaBr和KBr。并简单讨论了密度的变化规律。%Phase equilibria of two ternary systems NaBr-Na2SO4-H2O and NaBr-KBr-H2O at 373 K were studied by an isothermal solution saturation method. The solubility and density of these systems were determined experimentally and related phase diagrams were obtained. The results show that the two systems are both of simple type with no complex salts or solid solutions formed. Both of the phase diagrams show that they have one eutectic point, two univariant curves and two regions of crystallization. The solid phase in NaBr-Na2SO4-H2O is cpmposited of sodium bromide(NaBr) and sodium sulfate(Na2SO4), while sodium bromide(NaBr) and potassium bromide(KBr) are the components of the solid phase of NaBr-KBr-H2O. Density change of the two systems was discussed.

  10. Kaolin-based geopolymers with various NaOH concentrations

    Science.gov (United States)

    Heah, C. Y.; Kamarudin, H.; Mustafa Al Bakri, A. M.; Bnhussain, M.; Luqman, M.; Khairul Nizar, I.; Ruzaidi, C. M.; Liew, Y. M.

    2013-03-01

    Kaolin geopolymers were produced by the alkali-activation of kaolin with an activator solution (a mixture of NaOH and sodium silicate solutions). The NaOH solution was prepared at a concentration of 6-14 mol/L and was mixed with the sodium silicate solution at a Na2SiO3/NaOH mass ratio of 0.24 to prepare an activator solution. The kaolin-to-activator solution mass ratio used was 0.80. This paper aimed to analyze the effect of NaOH concentration on the compressive strength of kaolin geopolymers at 80°C for 1, 2, and 3 d. Kaolin geopolymers were stable in water, and strength results showed that the kaolin binder had adequate compressive strength with 12 mol/L of NaOH concentration. When the NaOH concentration increased, the SiO2/Na2O decreased. The increased Na2O content enhanced the dissolution of kaolin as shown in X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. However, excess in this content was not beneficial for the strength development of kaolin geopolymers. In addition, there was the formation of more geopolymeric gel in 12 mol/L samples. The XRD pattern of the samples showed a higher amorphous content and a more geopolymer bonding existed as proved by FTIR analysis.

  11. Study of thermal neutron capture in /sup 23/Na

    Energy Technology Data Exchange (ETDEWEB)

    Zhang Ming; Shi Zongren; Zeng Xiantang; Li Guohua; Ding Dazhao

    1987-11-01

    Energies and intensities of 117 gamma-rays produced by the capture of thermal neutron in /sup 23/Na are measured by using a single Ge(Li) detector and a pair spectrometer. 107 gamma-rays are placed in the decay scheme consisting of 35 levels. The neutron binding energy is found to be 6959.51 (21) keV. The parameters of /sup 24/Na energy level density are determined with the Back-Shift Fermi Gas Model. The /sup 23/Na(n, ..gamma..)/sup 24/Na reaction is mainly a statistical process from the resonance capture of 2.85 keV state.

  12. Study of thermal neutron capture in /sup 23/Na

    Energy Technology Data Exchange (ETDEWEB)

    Zhang Ming; Shi Zongren; Zeng Xiantang; Li Guohua; Ding Dazhao

    1989-04-01

    Energies and intensities of 117 gamma-rays produced by the capture of thermal neutrons in /sup 23/Na are measured by using a single Ge(Li) detector and a pair spectrometer. 107 gamma-rays are placed in a decay scheme consisting of 35 levels. The neutron binding energy is found to be 6959.51 (21) keV. The parameters of /sup 24/Na energy-level density are determined with the Back-Shift Fermi Gas Model. The /sup 23/Na(/ital n/,..gamma..) /sup 24/Na reaction is mainly a statistical process from the resonance capture of the 2.85 keV state.

  13. NaIrO3 - A pentavalent post-perovskite

    OpenAIRE

    Bremholm, M.; Dutton, S. E.; Stephens, P.W.; Cava, R. J.

    2010-01-01

    Sodium iridium(V) oxide, NaIrO3, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO3, the much-studied structural analogue of the high-pressure post-perovskite phase of MgSiO3. Among the oxide post-perovskites, NaIrO3 is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO6 octahedra separated by layers of NaO8 bicapped trigonal prisms. NaIrO3 shows no ma...

  14. KAKOVOST PRENOSA SIGNALA NA BREZŽIČNI NAPRAVI MIKROTIK

    OpenAIRE

    Šilak, Andraž

    2015-01-01

    V diplomskem delu smo izvedli analizo vpliva vremena na prenos brezžičnega signala. V delu je predstavljen teoretični del prenosa signalov in njihovi standardi ter vpliv vremena na njihov prenos na napravah MikroTik. Najprej je predstavljena teoretična podlaga prenosov signalov. Nato smo predstavili standarde, ki jih uporabljamo pri prenosu teh signalov. Predstavili smo tudi protokol SNMP, ki nam je omogočil nadzor. V nadaljevanju so predstavljeni rezultati dejanskih testov, ki smo jih opravi...

  15. NaCl胁迫对阿月浑子各器官Na+、K+吸收的影响%Effect of NaCl Stress on Na+ and K+ Uptakes by Different Organs of Pistachio

    Institute of Scientific and Technical Information of China (English)

    克热木·伊力; 袁琳; 马合木提·卡热

    2005-01-01

    在温室盆栽条件下,用NaCl处理新疆长果阿月浑子与美国品种Kerman,处理浓度为50、150、250和500 mmol·L-1,盐处理后5、10、20 d分别取叶、茎和根,测定各器官中Na+、K+含量及Na+/K+变化规律.研究结果表明,随着土壤盐浓度的增加,长果阿月浑子和Kerman的叶、茎和根中Na+离子含量在盐处理5、10、20 d后每个处理都表现出升高趋势;而两个品种的叶、根和茎中的K+含量在盐处理后其变化规律都不稳定.长果阿月浑子叶片、茎和根系中Na+/K+的比值在盐处理5 d和10 d都升高.Kerman的叶和根系中Na+/K+比值在处理5、10、20 d后升高;茎中Na+/K+处理10 d后升高,但20 d后没有明显变化.实验结果表明NaCl胁迫后,长果阿月浑子的叶片中Na+含量增加幅度均大于Kerman,Kerman根和茎中的Na+含量增加幅度大于长果阿月浑子;NaCl胁迫5 d和10 d后,长果阿月浑子叶片中的Na+/K+的比值高于Kerman,Kerman茎和根部中的Na+/K+的比值高于长果阿月浑子,表明了长果阿月浑子和Kerman都具有一定的耐盐性,但Kerman的耐盐性强于长果阿月浑子.由于叶片和根中Na+和Na+/K+比值的变化很稳定,可以确定为阿月浑子主要抗盐指标,茎中Na+/K+的变化规律较稳定,可以作为抗盐性参考指标.

  16. Transcriptional regulators of Na, K-ATPase subunits

    Directory of Open Access Journals (Sweden)

    Zhiqin eLi

    2015-10-01

    Full Text Available The Na,K-ATPase classically serves as an ion pump creating an electrochemical gradient across the plasma membrane that is essential for transepithelial transport, nutrient uptake and membrane potential. In addition, Na,K-ATPase also functions as a receptor, a signal transducer and a cell adhesion molecule. With such diverse roles, it is understandable that the Na,K-ATPase subunits, the catalytic alpha-subunit, the beta-subunit and the FXYD proteins, are controlled extensively during development and to accommodate physiological needs. The spatial and temporal expression of Na,K-ATPase is partially regulated at the transcriptional level. Numerous transcription factors, hormones, growth factors, lipids and extracellular stimuli modulate the transcription of the Na,K-ATPase subunits. Moreover, epigenetic mechanisms also contribute to the regulation of Na,K-ATPase expression. With the ever growing knowledge about diseases associated with the malfunction of Na,K-ATPase, this review aims at summarizing the best-characterized transcription regulators that modulate Na,K-ATPase subunit levels. As abnormal expression of Na,K-ATPase subunits have been observed in many carcinoma, we will also discuss transcription factors that are associated with epithelial-to-mesenchymal transition, a crucial step in the progression of many tumors to malignant disease.

  17. Thermodynamic modeling of the (Al2O3 + Na2O), (Al2O3 + Na2O + SiO2), and (Al2O3 + Na2O + AlF3 + NaF) systems

    International Nuclear Information System (INIS)

    Highlights: ► We modeled Al2O3–Na2O–SiO2 and Al2O3–Na2O–AlF3–NaF using the Modified Quasichemical Model in the Quadruplet Approximation. ► This assessment includes a very thorough review of all available experimental data for Al2O3–Na2O and Al2O3–Na2O–SiO2. ► The charge compensation effect in the SiO2-rich region of the (Al2O3 + Na2O + SiO2) system is modeled with a NaAl4+ cation. ► First detailed thermodynamic modeling of the (Al2O3 + Na2O + SiO2) ternary system. ► First thermodynamic modeling at all compositions and temperatures of the (Al2O3 + Na2O + AlF3 + NaF) reciprocal oxyfluoride system. - Abstract: All available thermodynamic and phase diagram data for the condensed phases of the (Al2O3 + Na2O), (Al2O3 + Na2O + SiO2), and (Al2O3 + Na2O + AlF3 + NaF) systems have been critically assessed. Model parameters for solid solutions and a single set of parameters for the liquid solution in the binary, ternary, and ternary reciprocal systems have been optimized and permit to reproduce most of the critically reviewed experimental data. The Modified Quasichemical Model in the Quadruplet Approximation was used for the oxyfluoride (mixture of molten oxides and salts) liquid solution, which exhibits strong first-nearest-neighbor and second-nearest-neighbor short-range order. This thermodynamic model takes into account both types of short-range order as well as the coupling between them. The charge compensation effect present in the (Al2O3 + Na2O + SiO2) system was taken into account by adding a (NaAl)4+ species in the liquid solution.

  18. ODŠKODNINSKA ODGOVORNOST ZARADI MOBINGA NA DELOVNEM MESTU

    OpenAIRE

    Slatinek, Matej

    2013-01-01

    Diplomsko delo obravnava odškodninsko odgovornost zaradi mobinga na delovnem mestu. Pojav mobinga je v današnjem času vedno pogostejši, zato je potreba po dobri pravni urejenosti tega področja velika. Slovenija je trpinčenje na delovnem mestu v svojo pravno ureditev uvedla šele dokaj pozno, nekje okoli leta 2007. Tedaj je mobing uredila na različnih področjih kot so: kazensko pravo, delovno pravo in pravo človekovih pravic, glede odškodninske odgovornosti pa je žrtve mobinga napotila na splo...

  19. VPLIV MOBINGA NA USPEŠNOST PODJETJA X

    OpenAIRE

    Šinko, Renira Dominika

    2012-01-01

    Družba deluje na način, da posameznik brez sodelovanja z drugimi le težko uspe. Poleg trdnega zaupanja v svoje sposobnosti, zmožnosti in prepričanja je za doseganje začrtanih ciljev potrebna uspešna komunikacija ali kakršnakoli druga oblika interakcije z okolico. Vsakdanja težnja po dokazovanju in uspehu povzroča konkurenco, pritisk, pomanjkanje časa, to pa vodi k neuspešnemu komuniciranju, rahlja ustvarjena razmerja in ima za posledico propad posameznika. Vse bolj se nasilje na ulicah i...

  20. DISKRIMINACIJA PRI ZAPOSLOVANJU IN DELU NA PODLAGI SPOLNE USMERJENOSTI

    OpenAIRE

    Markovič, Polona

    2012-01-01

    Ustavno zagotovljena pravica do enakosti, brez kakršnegakoli razlikovanja na podlagi osebnih okoliščin, predstavlja eno izmed temeljnih človekovih pravic. Za zagotavljanje enakega obravnavanja posameznikov in različnih skupin oseb na vseh področjih družbenega življenja je neizogibno potrebna natančna zakonska opredelitev varstva pred diskriminacijo. Prepoved diskriminacije je pravno regulirana v določilih mnogih dokumentov, sprejetih na mednarodni in nacionalni ravni. Diskriminacijo lahko naj...

  1. PRISPEVKI ZA SOCIALNO VARNOST S POUDARKOM NA ODGOVORNOSTI DELODAJALCA

    OpenAIRE

    Zupan, Tjaša

    2010-01-01

    Finančna nedisciplina na področju prispevkov za socialno varnost je v Sloveniji prisotna že vrsto let, država pa se pri ureditvi te problematike zdi nemočna. Da je dejansko stanje na področju plačila prispevkov za socialno varnost slabo, se ve, vendar pa to še ne pomeni tudi teoretično slabo zasnovanega sistema. Največji problem pri vzpostavitvi finančne discipline namreč predstavlja izvajanje sistema v praksi, kar se kaže predvsem v pomanjkanju nadzora pristojnih institucij in nekorektnem de...

  2. STRES I PSIHOLOŠKO ZLOSTAVLJANJE NA RADNOM MJESTU

    OpenAIRE

    Poredoš, Daša; Kovač, Marina

    2006-01-01

    U ovom radu nastojimo obraditi problem stresa i psihičkog zlostavljanja na radnom mjestu. Stanje stresa na radnom mjestu može se definirati kao niz za pojedinca štetnih fizioloških, psiholoških i bihevioralnih reakcija u kojima zahtjevi posla nisu u skladu s njegovim sposobnostima, mogućnostima i potrebama. Sindrom sagorijevanja na poslu jedan je od najnepovoljnijih posljedica dugotrajne izloženosti profesionalnom stresu. Stres na poslu rezultat je interakcija zaposlenika i karakteristika pos...

  3. RAVNANJE Z NEVARNIMI SNOVMI NA PETROLOVIH BENCINSKIH SERVISIH

    OpenAIRE

    Pirc, Dejan

    2013-01-01

    V diplomskem delu je opredeljena problematika nevarnih snovi ter njihovih škodljivih učinkov na zdravje ljudi in na okolje. Opisan je tudi pojav nevarnih odpadkov, ki se nanaša na probleme okoljevarstvene politike. Podane so nekatere evropske in svetovne smernice na področju ravnanja z nevarnimi snovmi, varovanja delavcev pred učinki nevarnih snovi ter varstva okolja. Navedeni in opisani so tudi slovenski zakoni, ki urejajo to področje. Natančno so tudi opisani vidiki ravnanja z nevarnim...

  4. ZADOVOLJSTVO ZAPOSLENIH NA JAVNEM SKLADU RS ZA KULTURNE DEJAVNOSTI

    OpenAIRE

    Fišer, Laura

    2015-01-01

    Delovno zadovoljstvo zaposlenih vpliva na njihovo uspešnost in učinkovitost. Konkurenca je na vseh področjih velika, zato organizacije od svojih zaposlenih zahtevajo tudi iznajdljivost za hitro prilagajanje okolju. Zadovoljstvo si zaposleni predstavljajo na različne načine. Nekateri si želijo boljših medsebojnih odnosov, drugi upoštevanje in uresničevanje svojih idej, tretji pohvalo in priznanje. Če organizacija želi zaposlene pripraviti do učinkovitosti in uspešnosti, mora ustvariti dobr...

  5. VLOGA ETIKE PRI PREPREČEVANJU NADLEGOVANJA NA DELOVNEM MESTU

    OpenAIRE

    Sambolec, Katja

    2013-01-01

    V diplomskem seminarju smo obravnavali temo z naslovom Vpliv etike pri preprečevanju nadlegovanja na delovnem mestu. Tema o nadlegovanju na delovnem mestu, je aktualna že desetletja in glede na gospodarsko krizo, ki ji še ni videti konca, je aktualna še danes. Zaradi prenasičenosti trga s ponudniki iste branže, se posledično v posameznih podjetjih izvajajo pritiski na zaposlene, ki v različnih situacijah vodijo do nadlegovanja. Pri pisanju diplomskega seminarja smo se najprej osredotoči...

  6. Influenza virus neuraminidase (NA): a target for antivirals and vaccines.

    Science.gov (United States)

    Jagadesh, Anitha; Salam, Abdul Ajees Abdul; Mudgal, Piya Paul; Arunkumar, Govindakarnavar

    2016-08-01

    Influenza, the most common infectious disease, poses a great threat to human health because of its highly contagious nature and fast transmissibility, often leading to high morbidity and mortality. Effective vaccination strategies may aid in the prevention and control of recurring epidemics and pandemics associated with this infectious disease. However, antigenic shifts and drifts are major concerns with influenza virus, requiring effective global monitoring and updating of vaccines. Current vaccines are standardized primarily based on the amount of hemagglutinin, a major surface antigen, which chiefly constitutes these preparations along with the varying amounts of neuraminidase (NA). Anti-influenza drugs targeting the active site of NA have been in use for more than a decade now. However, NA has not been approved as an effective antigenic component of the influenza vaccine because of standardization issues. Although some studies have suggested that NA antibodies are able to reduce the severity of the disease and induce a long-term and cross-protective immunity, a few major scientific issues need to be addressed prior to launching NA-based vaccines. Interestingly, an increasing number of studies have shown NA to be a promising target for future influenza vaccines. This review is an attempt to consolidate studies that reflect the strength of NA as a suitable vaccine target. The studies discussed in this article highlight NA as a potential influenza vaccine candidate and support taking the process of developing NA vaccines to the next stage. PMID:27255748

  7. Komparativna procjena Interneta u odnosu na tisak i televiziju

    OpenAIRE

    Bubaš, Goran; Kermek, Dragutin

    2000-01-01

    Internet nije više novost u životu i profesionalnom radu mnogih korisnika medija, kao ni osoba koje se bave novinarstvom. Nakon nekoliko desetljeća dominacije tradicionalnih masovnih medija, Internet dovodi do bitnijih promjena u načinu na koji pojedinci ispunjavaju svoje informacijske potrebe, kao i u načinu na koji se mogu oblikovati informacije u nekom masovnom mediju. Cilj ovog istraživanja bio je utvrditi kako osobe koje su upoznate s Internetom promatraju taj novi medij u...

  8. Vrednotenje ustreznosti postavitve gradiva na oddelku za mladino

    OpenAIRE

    Pirnat, Nataša

    2015-01-01

    Kvalitetna postavitev gradiva je ena izmed prioritet vsake knjižnice. V Sloveniji je večini knjižnic skupna UDK postavitev. Z največjimi problemi pri njeni uporabi se srečujejo najmlajši uporabniki knjižnic - otroci. Vrstilci sistema UDK so za otroke prezapleteni, zato bi bilo potrebno postavitev gradiva preoblikovati na otrokom prijazen način. V Mestni knjižnici Ljubljana so na oddelku za mladino leta 2010 oblikovali otrokom prilagojeno postavitev gradiva le na področju leposlovja, strokovno...

  9. PRIMERJAVA OGLAŠEVANJA NA GOOGLU IN FACEBOOKU

    OpenAIRE

    Janžekovič, Tjaša

    2012-01-01

    Internet pomeni na področju trženja nov tip interaktivnega oglaševanja, ki poleg oglaševanja ponuja še dvostransko komunikacijo. Oglaševanje na svetovnem spletu je v zadnjih nekaj letih najhitreje rastoči trend v oglaševanju nasploh in ima za oglaševalce veliko prednosti v primerjavi z uporabo ostalih medijskih kanalov. Namen oglaševanja na internetu je v tem, da oglaševalec pritegne čim več obiskovalcev na svojo spletno stran, kjer ponudi informacije o podjetju in njegovih izdelkih oz. stori...

  10. Synthesis of NaA zeolite from kaolin source

    Institute of Scientific and Technical Information of China (English)

    Qian MIAO; Zhihui ZHOU; Jianhua YANG; Jinming LU; Shiwei YAN; Jinqu WANG

    2009-01-01

    In this work, zeolite NaA was successfully synthesized by a hydrothermal method using kaolin as a combined source for silica and alumina. Zeolite NaA with high static water adsorption was synthesized from the low-cost raw material, kaolin, and the reaction parameters were optimized. Metakaolin was obtained by calcining kaolin at temperatures ranged from 953 K to 1173 K. The synthesis mixture was pre-crystallized at 343 K and crystallized at 373 K successively. Zeolite NaA was obtained, which was confirmed by SEM, XRD and the water adsorption analysis. The optimized metakaolinization temperature was found at 973 K. The influence of Na2O/SiO2 molar ratio, pre-crystallization time and seed on the crystal- lization of NaA zeolite was investigated. A thorough mixing of metakaolin and NaOH solution was favourable for the nucleation/crystallization rate. The obtained NaA zeolite under the optimized conditions shows excellent crystallinity and static water adsorption of 28.0wt-%,which was higher than 25.9 wt-% of the commercial NaA zeolite. Kaolin was suggested to be a feasible and economical raw material for the practical industrial applications for NaA zeolite.

  11. UTJECAJ HRANJIVE PODLOGE I TEMPERATURE NA RAZVOJ SCLEROTINIA SCLEROTIORUM

    OpenAIRE

    Mikić, Ivan; Radan, Zvonko; Ćosić, Jasenka; Vrandečić, Karolina

    2014-01-01

    Cilj istraživanja bio je utvrditi utjecaj hranjive podloge (krumpir dekstrozni agar (PDA), podloga od mrkve) i temperature (15, 22 i 30ºC) na rast i razvoj micelija i formiranje sklerocija gljive Sclerotinia sclerotiorum. Istraživanje je provedeno u laboratorijskim uvjetima 2013. godine. Statističkom obradom podataka utvrđeno je da podloga i temperatura značajno utječu na porast micelija i formiranje sklerocija. Utvrđen je statistički značajno bolji razvoj micelija na PDA podlozi te na temper...

  12. (I)Mobilidade na cidade de São Paulo

    OpenAIRE

    Raquel Rolnik; Danielle Klintowitz

    2011-01-01

    O trabalho procura deslindar a crise da mobilidade que a metrópole paulistana tem vivido na última década. Para tanto, apresenta uma análise crítica acerca dos projetos de mobilidade que foram implantados historicamente na cidade de São Paulo, focalizando em particular os investimentos e as mudanças na gestão realizados pelos poderes públicos municipal e estadual em infraestrutura viária e transporte coletivo na última década.This paper seeks to understand the mobility crisis lived by São Pau...

  13. VPLIVI NA OBISKOVANJE PREDAVANJ IN VAJ ŠTUDENTOV

    OpenAIRE

    Hiršel, Špela

    2010-01-01

    Izostajanje študentov od predavanj in vaj vzbuja v visokem šolstvu skrb in vpliva tako na učitelje, asistente, strokovne sodelavce kot tudi na študente, ki v študijskem procesu sodelujejo. Obiskanost izobraževalnega procesa je v veliki meri, ne pa v celoti, odvisna od temeljnih dejavnikov izobraževalnega procesa (izobraževanec, učitelj in vsebina izobraževanja). Na celotno obiskanost in uspešnost vplivajo med drugim tudi oblike ter metode izobraževanja, učna sredstva in pripomočki. Temeljno m...

  14. UTJECAJ PROVJERAVANJA I OCJENJIVANJA ZNANJA NA UČENJE

    OpenAIRE

    Penca Palčić, Marjana

    2008-01-01

    Posljedice loše nastave ne mogu se otkloniti tek postupcima strogoga ocjenjivanja, a osim toga, loše ocjenjivanje često deformira prednost dobre nastave. Zato na važnosti sve više dobiva provjeravanje znanja, raširenost situacija u kojima se provjeravanje odvija i promjena načina provjeravanja što posljedično utječe i na učenje. Provjeravanje i ocjenjivanje sastavni su dijelovi nastavnoga procesa. Svoju ulogu imaju tako u procesu podučavanja, kako i u procesu učenja. Način provjeravanja i ocj...

  15. UTJECAJ PREKOVREMENOG RADA NA ZDRAVLJE RADNIKA

    OpenAIRE

    Zavalić, Marija

    2013-01-01

    SAŽETAK: Više od 13 % radnika u zemljama Europske unije radi prekovremeno, a tek u zadnjih desetak godina, za razliku od ranije, prekovremeni rad je ograničen do najviše deset sati tjedno. Mnogobrojnim studijama utvrđeno je da radnici koji rade prekovremeno češće od drugih radnika iste dobi i spola imaju stres na radu. Kao posljedice stresa češće su nesanice kod radnika, češće obolijevaju od akutnog srčanog ili moždanog infarkta, češće imaju povišeni tlak, češće obolijevaju od šećerne bolesti...

  16. Vliv CSR aktivit na reputaci firmy

    OpenAIRE

    Oberreiter, Štěpán

    2008-01-01

    Hlavním cílem této bakalářské práce je posouzení vlivu CSR(Corporate Social Responsibility-do čestiny přeloženo jako společenská odpovědnost firem) na reputaci firmy. V práci krátce představím historický vývoj CSR, současný stav a přiblíží též různé metody měření těchto aktivit. Dalším cílem práce je posoudit, jestli se jedná v případě těchto aktivit o náklad, či o investici.

  17. Hotel na Vysočině

    OpenAIRE

    Machatka, Petr

    2013-01-01

    Diplomová práce s názvem Hotel na Vysočině řeší projektovou dokumentaci ve stupni pro provedení stavby. Hotel má tři nadzemní podlaží. Objekt je nepodsklepený. Zastřešení je provedeno plochou a šikmou střechou. Zdící systém POROTHERM s kontaktním zateplením expandovaným polystyrenem EPS -F. The master thesis named Hotel at Vysočina solves project documentation in the degree for building construction. The hotel has three floors. The object is without a cellar. As roofing is used a flat and ...

  18. UTJECAJ CO2 NA CEMENTNI KAMEN

    OpenAIRE

    Gaurina-Međimurec, Nediljka

    2010-01-01

    Hvatanje (kaptiranje) i geološko skladištenje CO2 predstavlja jedan od načina smanjenja ispuštanja stakleničkih plinova u atmosferu. Kritični uvjeti za sigurno skladištenje CO2 u duboko zaliježuće propusne stijene su: odgovarajuća konstrukcija bušotine i postojanje nepropusnih pokrovnih stijena. Za utiskivanje CO2 mogu se koristiti nove ili već postojeće bušotine. U oba slučaja, dugotrajni integritet utisnih bušotina (do 1 000 godina) je ključni paramertar za geološko skladištenje CO2. Utisnu...

  19. Os poejos na boa cozinha portuguesa

    OpenAIRE

    Monteiro, Ana; Póvoa, Orlanda; Marinho, Sérgio; Rodrigues, Leandra; Monteiro, Patrícia

    2008-01-01

    O poejo (Mentha pulegium L.) e a hortelã-da-ribeira (Mentha cervina L.) também conhecida por poejo-fino e erva-peixeira, pertencem à família Lamiaceae (Labiadas) e têm uma longa história como ervas aromáticas e plantas medicinais na etnografia portuguesa. As duas espécies são autóctones do sudoeste da Península Ibérica (Estrelles et al., 2004), são plantas vivazes, estolhosas, com folhagem aromática e ocorrem, geralmente, em locais húmidos e encharcados, em valas, margens de linhas de água e ...

  20. O retorno do religioso na contemporaneidade

    Directory of Open Access Journals (Sweden)

    Tiago Ribeiro Nunes

    2008-12-01

    Full Text Available O presente trabalho pretende analisar os novos modos de relação, entre a civilização e o sagrado, que emergem no contexto da contemporaneidade. Partindo principalmente das formulações freudianas e lacanianas sobre o tema, nosso objetivo primordial ao longo deste artigo é estabelecer parâmetros para compreender a ocorrência do "retorno ao sagrado no exato momento em que a humanidade enfrenta crises cada vez mais profundas e permanentes. Tal empreendimento nos permitirá verificar até que ponto o fortalecimento dos movimentos religiosos pode ser considerado como uma das conseqüências da queda dos referenciais que se realiza na contemporaneidade.

  1. Trombólise na embolia pulmonar

    OpenAIRE

    Rocha, Ana Carolina dos Santos Silva

    2011-01-01

    Introdução: A embolia pulmonar é uma condição clínica potencialmente letal em todos os grupos etários, pelo que é considerada uma emergência cardiovascular. O diagnóstico é difícil de estabelecer, pela pouca especificidade do quadro clínico, condicionando, diferentes prognósticos e riscos de mortalidade. O tratamento depende da apresentação clínica e a terapêutica trombolítica tem um papel decisivo na melhoria do outcome dos doentes, em situações seleccionadas. Objectivos: A actual revisão...

  2. Bullying: ato esburacado na angústia

    Directory of Open Access Journals (Sweden)

    Maria de Lourdes Soares Ornellas

    2012-04-01

    Full Text Available A noção de afeto está no campo do (desprazer, resultante de uma experiência afetiva de satisfação ou insatisfação, e que se manifesta nas necessidades do sujeito. Pode-se dizer que o afeto envolve a ambivalência de sentimentos, do mais agradável ao mais insuportável, e desempenha um papel estruturante para que o sujeito reencontre sua estrutura psíquica, exercendo uma ação mediadora e decisiva sobre a constituição do sujeito do desejo, orientando o seu projeto de vida, sua profissão, sua opção sexual, etc. Essa ambivalência de afetos deve ser exercitada na educação familiar e escolar, na fala e na escuta que o afeto (desprazeroso tem relevância e parece ser silenciado. O desprazer pode ser escandido pelos sintomas medo, depressão, irritabilidade, ansiedade, humilhação. Assim posto o bullying é também conhecido como a síndrome da humilhação. O objetivo da humilhação é a tentativa de destruição do sujeito; a perda da identificação revela um fantasma, na medida em que própria vítima se sente culpada por sofrer ou por estar sofrendo um ato esburacado porque uma das peças não é encontrada e, em lugar do encaixe, o que se mostra é um buraco, o que provoca a angústia entre quem perde e aquele que ganha. ABSTRACT: The notion of affect is thus in the field of (dis pleasure, resulting from an affective experience of satisfaction or dissatisfaction, and that manifests itself on the needs of the subject. You could say that the affection involves the ambivalence of feelings, the more enjoyable the more unbearable, and plays a structural role for the subject to rediscover his psychic structure, exerting a mediator and decisive action on the constitution of the subject of desire, directing the its design life, your profession, your sexual orientation, etc.. This ambivalence of feelings should be exercised in family education and school, talking and listening that affect (dis pleasure is relevant and appears to be

  3. LUZ, MELATONINA E ESTRESSE OXIDATIVO NA PISCICULTURA

    Directory of Open Access Journals (Sweden)

    Claudio Alberto Gellis de Mattos Dias

    2013-12-01

    Full Text Available Em peixes, como nos mamíferos, partes do sistema nervoso estão envolvidas em mecanismos para regulação dos sistemas corporais em sintonia com o meio. O fotoperíodo é traduzido em informações fisiológicas a partir da secreção de melatonina.Parece não haver barreiras morfofisiológicas para esta indolamina, isto é, a melatonina perfunde-se rapidamente em cada célula do organismo e em alguns casos interage com receptores e membrana situados na superfície celular, e parece estar ligada à ingestão de alimentos, crescimento e atividade locomotora de peixes. São moléculas importantes metabolizando espécies reativas de oxigênio a produtos inativos e, portanto, reduzindo o dano oxidativo.Este trabalho tem por objetivo fazer um breve levantamento em artigos recentes sobre luminosidade, melatonina e o estresse oxidativo em peixes, e correlaciona-los com piscicultura. Concluímos que a luminosidade parece estar ligada a produção de melatonina, e esta molécula antioxidante, que favorece a redução do estresse oxidativo, parecem melhorar o desempenho na produção de peixes em criadouros. Palavras-chave: Melatonina, estresse oxidativo, piscicultura. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n3p169-176

  4. Mercury's Na Exosphere from MESSENGER Data

    Science.gov (United States)

    Killen, Rosemary M.; Burger, M. H.; Cassidy, T. A.; Sarantos, M.; Vervack, R. J.; McClintock, W. El; Merkel, A. W.; Sprague, A. L.; Solomon, S. C.

    2012-01-01

    MESSENGER entered orbit about Mercury on March 18, 2011. Since then, the Ultraviolet and Visible Spectrometer (UWS) channel of MESSENGER's Mercury Atmospheric and Surface Composition Spectrometer (MASCS) has been observing Mercury's exosphere nearly continuously. Daily measurements of Na brightness were fitted with non-uniform exospheric models. With Monte Carlo sampling we traced the trajectories of a representative number of test particles, generally one million per run per source process, until photoionization, escape from the gravitational well, or permanent sticking at the surface removed the atom from the simulation. Atoms were assumed to partially thermally accommodate on each encounter with the surface with accommodation coefficient 0.25. Runs for different assumed source processes are run separately, scaled and co-added. Once these model results were saved onto a 3D grid, we ran lines of sight from the MESSENGER spacecraft :0 infinity using the SPICE kernels and we computed brightness integrals. Note that only particles that contribute to the measurement can be constrained with our method. Atoms and molecules produced on the nightside must escape the shadow in order to scatter light if the excitation process is resonant-light scattering, as assumed here. The aggregate distribution of Na atoms fits a 1200 K gas, with a PSD distribution, along with a hotter component. Our models constrain the hot component, assumed to be impact vaporization, to be emitted with a 2500 K Maxwellian. Most orbits show a dawnside enhancement in the hot component broadly spread over the leading hemisphere. However, on some dates there is no dawn/dusk asymmetry. The portion of the hot/cold source appears to be highly variable.

  5. Mercury's Na Exosphere from MESSENGER data

    Science.gov (United States)

    Killen, Rosemary M.; Burger, M. H.; Cassidy, T. A.; Sarantos, M.; Vervack, R. J.; McClintock, W. E.; Merkel, A. W.; Sprague, A. L.; Solomon, S. C.

    2012-10-01

    MESSENGER entered orbit about Mercury on March 18, 2011. Since then, the Ultraviolet and Visible Spectrometer (UVVS) channel of MESSENGER's Mercury Atmospheric and Surface Composition Spectrometer (MASCS) has been observing Mercury's exosphere nearly continuously. Daily measurements of Na brightness were fitted with non-uniform exospheric models. With Monte Carlo sampling we traced the trajectories of a representative number of test particles, generally one million per run per source process, until photoionization, escape from the gravitational well, or permanent sticking at the surface removed the atom from the simulation. Atoms were assumed to partially thermally accommodate on each encounter with the surface with accommodation coefficient 0.25. Runs for different assumed source processes are run separately, scaled and co-added. Once these model results were saved onto a 3D grid, we ran lines of sight from the MESSENGER spacecraft to infinity using the SPICE kernels and we computed brightness integrals. Note that only particles that contribute to the measurement can be constrained with our method. Atoms and molecules produced on the nightside must escape the shadow in order to scatter light if the excitation process is resonant-light scattering, as assumed here. The aggregate distribution of Na atoms fits a 1200 K gas, with a PSD distribution, along with a hotter component. Our models constrain the hot component, assumed to be impact vaporization, to be emitted with a 2500 K Maxwellian. Most orbits show a dawnside enhancement in the hot component broadly spread over the leading hemisphere. However, on some dates there is no dawn/dusk asymmetry. The hot portion of the source appears to be highly variable. The authors acknowledge support from NASA through the MESSENGER Participating Scientist Program and Planetary Atmospheres research grants.

  6. Sodium scandium diphosphate, NaScP2O7, isotypic with α-NaTi(IIIP2O7

    Directory of Open Access Journals (Sweden)

    Zdirad Žák

    2009-12-01

    Full Text Available Crystals of the title compound, NaScP2O7, were grown by a flux method. The crystal structure is isotypic with those of α-NaTiP2O7, NaYbP2O7 and NaLuP2O7, and is closely related to that of NaYP2O7. The structural set-up consists of a three-dimensional framework of P2O7 units that are corner-shared by ScO6 octahedra, forming tunnels running parallel to [010]. The Na atoms are situated in the tunnels and are surrounded by nine O atoms in a distorted environment.

  7. The naïve intuitive statistician: a naïve sampling model of intuitive confidence intervals.

    Science.gov (United States)

    Juslin, Peter; Winman, Anders; Hansson, Patrik

    2007-07-01

    The perspective of the naïve intuitive statistician is outlined and applied to explain overconfidence when people produce intuitive confidence intervals and why this format leads to more overconfidence than other formally equivalent formats. The naïve sampling model implies that people accurately describe the sample information they have but are naïve in the sense that they uncritically take sample properties as estimates of population properties. A review demonstrates that the naïve sampling model accounts for the robust and important findings in previous research as well as provides novel predictions that are confirmed, including a way to minimize the overconfidence with interval production. The authors discuss the naïve sampling model as a representative of models inspired by the naïve intuitive statistician. PMID:17638502

  8. Orbital-free molecular dynamics simulations of melting in $Na_{8}$ and $Na_{20} melting in steps

    CERN Document Server

    Aguado, A; Alonso, J A; Stott, M J; Aguado, Andres; Lopez, Jose M.; Alonso, Julio A.; Stott, Malcolm J.

    1999-01-01

    The melting-like transitions of Na8 and Na20 are investigated by extensive ab initio constant energy molecular dynamics simulations, using a variant of the Car-Parrinello method which employs an explicit electronic kinetic energy functional of the density, thus avoiding the use of one-particle orbitals. Several melting indicators are evaluated in order to determine the nature of the different transitions, and comparison with other theoretical calculations is made. Both Na8 and Na20 melt over a wide range of temperature. For Na8, a first transition is observed at approx. 110 K, between a rigid phase and a phase involving isomerization between the different permutational isomers of the ground state structure. The ``liquid'' phase is completely established at approx. 220 K. For Na20, three successive transitions are observed: the first phase transition, at approx. 110 K, is associated with isomerization transitions between those permutational isomers of the ground state structure which are obtained by interchang...

  9. Growth mechanism of NaClO3 and NaBrO3 crystals from aqueous solutions

    Indian Academy of Sciences (India)

    V Surender; N Arundhathi; K Kishan Rao

    2006-10-01

    A study of growth rates of NaClO3 and NaBrO3 has been carried out using a small growth cell by in situ observation. Normal growth rates of {100} faces of NaClO3 and {111} faces of NaBrO3 along $\\langle 110 \\rangle$ direction are measured under relatively high supersaturation ranging from 3–8%. In the initial stages of growth, {100}, {110} and {111} faces develop in NaClO3 and gradually all the faces are replaced by the {100} faces only. In the case of NaBrO3, mostly {111} faces develop with occasional occurrence of small {100} faces at the intersection of {111} faces. The growth mechanisms are investigated from growth rate vs supersaturation plots and from the observations of surface features. In the present supersaturation range, the growth mechanism appears to be due to two-dimensional growth mechanism.

  10. Study of the oxidation of Fe-Cr alloys at high temperatures; Estudo da oxidacao de ligas Fe-Cr a altas temperaturas

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro, J.F.; Sabioni, A.C.S. [Universidade Federal de Ouro Preto (LDM/DF/UFOP), MG (Brazil). Dept. de Fisica. Lab. de Difusao em Materiais; Trindade, V.B. [Universidade Federal de Ouro Preto (DEMM/UFOP), MG (Brazil). Dept. de Engenharia Metalurgica e de Materiais; Ji, V. [Laboratoire d' Etude des Materiaux Hors-Equilibre (LEMHE), Orsay (France)

    2010-07-01

    The high temperature oxidation behavior of Fe-1.5%Cr, Fe-5.0%Cr, Fe-10%Cr and Fe- 15%Cr model alloys were investigated from 700 to 850 deg C, in air atmosphere. The oxidation treatments were performed in a thermobalance with a sensitivity of 1{mu}g. The oxide films grown by oxidation of the alloys were characterized by scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The oxide films are Fe-Cr spinels with variable composition depending on the alloy composition. For all conditions studied, the oxidation kinetics of these alloys follow a parabolic law. The comparison of the oxidation rates of the four alloys, at 700 deg C, shows that the parabolic oxidation constants decrease from 1.96x10{sup -9}g{sup 2}.cm{sup -4}.s{sup -1}, for the alloy Fe-1.5% Cr, to 1.18 x 10-14g{sup 2}.cm{sup -4}.s{sup -1} for the alloy Fe-15% Cr. Comparative analysis of the oxidation behavior of the Fe-10%Cr and Fe-15%Cr alloys, between 700 and 850 deg C, shows that the oxidation rates of these alloys are comparable to 800 deg C, above this temperature the Fe-10%Cr alloy shows lower resistance to oxidation. (author)

  11. Decontamination of used pesticide packaging using advanced oxidation process by ionizing radiation; Descontaminacao de embalagens descartadas de clorpirifos utilizando o processo de oxidacao avancada por radiacao ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Mori, Manoel Nunes

    2006-07-01

    The discharge of empty plastic packaging of pesticides can be an environmental concern causing problems to human health, animals and plants if done without inspection and monitoring. Among the commercial pesticides, chloropyrifos has significant importance because of its wide distribution and extensive use and persistence. The hydroxyl OH attack is the most efficient process of chemical oxidation. The radiation-induced degradation of chloropyrifos in liquid samples and in polyethylene pack was studied by gamma-radiolysis. Packaging of high density polyethylene tree layer co extruded, named COEX, and water samples contaminated with chloropyrifos, were irradiated using both, a multipurpose Co-60 gamma irradiator and a gamma source with 5,000 Ci total activity, Gamma cell type. The chemical analysis of the chloropyrifos and by-products were made using a gas chromatography associated to the mass spectrometry. Gamma radiation was efficient for removing chloropyrifos from the plastic packaging in all studied cases. (author)

  12. Study for preparation of nanoporous titania on titanium by anodic oxidation; Estudo da preparacao de titania nanoporosa sobre titanio por oxidacao anodica

    Energy Technology Data Exchange (ETDEWEB)

    Passos, Alessandra Pires

    2014-07-01

    Currently titanium is the most common material used in dental, orthopedic implants and cardiovascular applications. In the mid 1960s, prof. Braenemark and coworkers developed the concept of osseointegration, meaning the direct structural and functional connection between living bone and the surface of artificial implant. Thus, studies on the modification of the implant surface are widely distributed among them are the acid attack, blasting with particles of titanium oxide or aluminum oxide, coating with bioactive materials such as hydroxyapatite, and the anodic oxidation. The focus of this work was to investigate the treatment of titanium surface by anodic oxidation. The aim was to develop a nanoporous titanium oxide overlay with controlled properties over titanium substrates. Recent results have shown that such surface treatment improves the biological interaction at the interface bone-implant besides protecting the titanium further oxidation and allow a faster osseointegration. The anodizing process was done in the potentiostatic mode, using an electrolyte composed of 1.0 mol/L H{sub 3}PO{sub 4} and HF 0.5% m/I. The investigated process parameters were the electrical potential (Va) and the process time (T). The electric potential was varied from 10 V to 30 V and the process time was defined as 1.0 h, 1.5 h or 2.0 h. The treated Ti samples were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive spectroscopy X-ray (EDS), and X-ray diffraction (XRD). The results showed the formation of nanoporous titanium oxide by anodizing with electric potential (Va) in the range of 20 V to 30 V and process time in the range of 1 to 2 hours. The average pore diameter was in the range 94-128 nm. Samples anodized in electric potential lower than 20 V did not show the formation of the nanoporous surface. In the case of Va above 30 V, it was observed the formation of agglomerates of TiO{sub 2}. The results obtained in this study showed no reproducibility, so that they still cannot be considered for a technological application. Such purpose would require the investigation of the effects of other important variables in the anodizing process (eg electrolyte composition, pH, temperature) in order to establish a reproducible process. (author)

  13. Exercise and Na+-K+-ATPase on Skeletal Muscle%运动与骨骼肌Na+-K+-ATP酶

    Institute of Scientific and Technical Information of China (English)

    安志红; 陈静宁

    2007-01-01

    本文简要介绍了骨骼肌Na+-K+-ATP酶的分布和功能;概述了近年来急性运动、运动训练和低氧环境下运动与骨骼肌Na+-K+-ATP酶及其mRNA表达的研究概况;分析了运动中影响骨骼肌Na+-K+ATP酶的因素.

  14. Suzbijanja nezakonite trgovine opojnim drogama na međunarodnom planu s osvrtom na hrvatsko kazneno zakonodavstvo

    OpenAIRE

    Milivojević, Lana

    2009-01-01

    U tekstu se ukazuje na konstantnu aktualnost nezakonite trgovine drogom kao pojavnom obliku transnacionalnoga organiziranog kriminala. Radi ukazivanja na dugotrajnost problema vezanih uz opojne droge opisan je put međunarodnopravne regulacije vezane uz opojne droge od samih začetaka pa do danas. Također su navedene i odredbe hrvatskoga kaznenopravnog zakonodavstva koje reguliraju to područje, uz osvrt na pribavljene statističke podatke o kriminalitetu droga.

  15. The relation between aging, aortic NaF avidity and coronary artery NaF avidity: A NaF PET CT study

    DEFF Research Database (Denmark)

    Blomberg, Björn; Thomassen, Anders; Hildebrandt, Malene;

    2013-01-01

    volunteers without traditional cardiovascular risk factors were prospectively assessed by Sodium 18-Fluoride (Na-18F) PET CT imaging. Global aortic uptake of Na-18F was determined by calculating the average aortic blood pool subtracted maximum standardized uptake value (cSUV) [maximum SUVaorta - mean...... SUVblood pool]. Global uptake of Na-18F in the coronary arteries was determined by calculating the average heart blood pool subtracted maximum SUV [maximum SUVheart - mean SUVblood pool]. Calculating regression and correlation coefficients summarized the data. Results: A strong linear relationship...

  16. Towards environmentally friendly Na-ion batteries: Moisture and water stability of Na2Ti3O7

    Science.gov (United States)

    Zarrabeitia, M.; Castillo-Martínez, E.; López Del Amo, J. M.; Eguía-Barrio, A.; Muñoz-Márquez, M. A.; Rojo, T.; Casas-Cabanas, M.

    2016-08-01

    We report here on the moisture and water stability of the promising Na-ion anode material Na2Ti3O7. Spontaneous Na+/H+ exchange is detected by PXRD after air exposure, forming solid solution compounds of the form Na2-xHxTi3O7 (0 techniques. Both mixed compositions crystallize in C2/m space group like H2Ti3O7, and therefore Na+/H+ exchange is found to involve a structural transition from AA stacking of [TiO6] layers to AB stacking sequence. The electrochemical behaviour of the mixed compositions vs. Na+/Na is studied as well as that of an electrode of pure Na2Ti3O7 prepared in water media. The water-processed electrode is shown to exhibit a superior cycling stability and therefore the results obtained highlight the potential of Na2Ti3O7 as a green, low cost anode material for NIBs.

  17. Non-magnetic insulator state in Na1CoO2 and phase separation of Na vacancies

    OpenAIRE

    de Vaulx, C.; Julien, M. -H.; Berthier, C.; Horvatic, M.; Bordet, P.; Simonet, V.; Chen, D. P.; Lin, C. T.

    2005-01-01

    Crystallographic, magnetic and NMR properties of a NaxCoO2 single crystal with x~1 are presented. We identify the stoichiometric Na1CoO2 phase, which is shown to be a non-magnetic insulator, as expected for homogeneous planes of Co3+ ions with S=0. In addition, we present evidence that, because of slight average Na deficiency, chemical and electronic phase separation leads to a segregation of Na vacancies into the well-defined, magnetic, Na0.8CoO2 phase. The importance of phase separation is ...

  18. Central role of the Na(+)-translocating NADH:quinone oxidoreductase (Na(+)-NQR) in sodium bioenergetics of Vibrio cholerae.

    Science.gov (United States)

    Steuber, Julia; Halang, Petra; Vorburger, Thomas; Steffen, Wojtek; Vohl, Georg; Fritz, Günter

    2014-12-01

    Vibrio cholerae is a Gram-negative bacterium that lives in brackish or sea water environments. Strains of V. cholerae carrying the pathogenicity islands infect the human gut and cause the fatal disease cholera. Vibrio cholerae maintains a Na(+) gradient at its cytoplasmic membrane that drives substrate uptake, motility, and efflux of antibiotics. Here, we summarize the major Na(+)-dependent transport processes and describe the central role of the Na(+)-translocating NADH:quinone oxidoreductase (Na(+)-NQR), a primary Na(+) pump, in maintaining a Na(+)-motive force. The Na(+)-NQR is a membrane protein complex with a mass of about 220 kDa that couples the exergonic oxidation of NADH to the transport of Na(+) across the cytoplasmic membrane. We describe the molecular architecture of this respiratory complex and summarize the findings how electron transport might be coupled to Na(+)-translocation. Moreover, recent advances in the determination of the three-dimensional structure of this complex are reported.

  19. Na+ and K+ levels in living cells: do they depend on the rate of outward transport of Na+?

    Science.gov (United States)

    Ling, G N; Ochsenfeld, M M

    1976-01-01

    At 25 degrees C, frog sartorius muslces rapidly gained Na+ and lost K+ in iodoacetamide and pure nitrogen. Beginning at normal levels, the concentrations of these ions in the cells reached those in the surrounding Ringer solution in 140 min. Yet during that time the Na+ efflux rate showed no sign of the slowing down demanded by Na-pump theory. The data support the view that maintenance and alterations of N1+ levels in frog muslce cells reflect adsorption on protein sites and the solubility property of bulk phase water and are independent of the rate at which Na+ leaves the cell surface. PMID:1088477

  20. Microhardness studies on as-grown faces of NaClO3 and NaBrO3 crystals

    Indian Academy of Sciences (India)

    K Kishan Rao; V Surender; B Saritha Rani

    2002-12-01

    Single crystals of NaClO3 and NaBrO3 are grown from their aqueous solutions at a constant temperature of 35°C by slow evaporation by using good quality seed crystals. Systematic microhardness studies are made on as-grown faces of these crystals at various loads. Typical cracks are observed at the corners of the impressions in NaClO3 whereas in addition to the cracks at the corners microcracks also appeared in NaBrO3 crystals around the impressions. The impressions formed in NaBrO3 are not very clear as in NaClO3, a possible mechanism for it is discussed. The work hardening index number () for both these crystals is around 1.6 suggesting that these are moderately harder samples. The hardness studies point out that NaBrO3 is harder than NaClO3 ( ≈ 100 kg/mm2), this could be due to strong inter ionic forces acting between Na–Br in NaBrO3 crystals. Using Gilman’s empirical relation, hardness values are calculated from the values of elastic constants (44) and are found to be close to the experimental results.

  1. Impact of childhood stress on psychopathology Impacto de estresse na infância na psicopatologia

    Directory of Open Access Journals (Sweden)

    Elisa Brietzke

    2012-12-01

    Full Text Available OBJECTIVE: Advances in our knowledge of mental disorder (MD genetics have contributed to a better understanding of their pathophysiology. Nonetheless, several questions and doubts persist. Recent studies have focused on environmental influences in the development of MDs, and the advent of neuroscientific methodologies has provided new perspectives. Early life events, such as childhood stress, may affect neurodevelopment through mechanisms such as gene-environment interactions and epigenetic regulation, thus leading to diseases in adulthood. The aim of this paper is to review the evidence regarding the role of the environment, particularly childhood stress, in the pathophysiology of MD. METHODOLOGY: We reviewed articles that evaluated environmental influences, with a particular focus on childhood trauma, brain morphology, cognitive functions, and the development of psychopathology and MD. RESULTS AND CONCLUSION: MRI studies have shown that exposure to trauma at an early age can result in several neurostructural changes, such as the reduction of the hippocampus and corpus callosum. Cognitive performance and functioning are also altered in this population. Finally, childhood stress is related to an increased risk of developing MD such as depression, bipolar disorder, schizophrenia and substance abuse. We conclude that there is robust evidence of the role of the environment, specifically adverse childhood experiences, in various aspects of MD.OBJETIVO: Avanços no conhecimento da genética dos transtornos mentais (TM contribuíram para um melhor entendimento de suas bases fisiopatológicas. No entanto, dúvidas e questões ainda persistem. Estudos recentes têm se concentrado nas influências do ambiente no desenvolvimento de TM, e o advento de metodologias neurocientíficas oferece novas perspectivas. Eventos precoces de vida, como estresse na infância, podem ser capazes de alterar o neurodesenvolvimento através de mecanismos como intera

  2. A ética na empresa : qual o papel da ética na empresa

    OpenAIRE

    Lima, João Manuel Ribeiro

    2014-01-01

    Com o intento de analisar e desenvolver qual o papel da ética na empresa, esta dissertação desenvolve-se com objetivo de demonstrar que a ética não é instrumental à empresa, não se restringe a uma ferramenta de gestão. Nesse sentido, para a análise desta questão, considero que é importante definir o que é uma empresa. Como tal, a análise começa por se centrar na teoria económica da firma mostrando as suas principais características e os seus limites. Contudo, há uma questão fundamental que...

  3. North America and South America (NA-SA) neuropathy project.

    Science.gov (United States)

    Pasnoor, Mamatha; Nascimento, Osvaldo J M; Trivedi, Jaya; Wolfe, Gil I; Nations, Sharon; Herbelin, Laura; de Freitas, M G; Quintanilha, Giseli; Khan, Saud; Dimachkie, Mazen; Barohn, Richard

    2013-08-01

    Peripheral neuropathy is a common neurological disorder. There may be important differences and similarities in the diagnosis of peripheral neuropathy between North America (NA) and South America (SA). Neuromuscular databases were searched for neuropathy diagnosis at two North American sites, University of Kansas Medical Center and University of Texas Southwestern Medical Center, and one South American site, Federal Fluminense University in Brazil. All patients were included into one of the six major categories: immune-mediated, diabetic, hereditary, infectious/inflammatory, systemic/metabolic/toxic (not diabetic) and cryptogenic. A comparison of the number of patients in each category was made between North America and South America databases. Total number of cases in North America was 1090 and in South America was 1034 [immune-mediated: NA 215 (19.7%), SA 191 (18%); diabetic: NA 148 (13.5%), SA 236 (23%); hereditary: NA 292 (26.7%), SA 103 (10%); infectious/inflammatory: NA 53 (4.8%), SA 141 (14%); systemic/metabolic/toxic: NA 71 (6.5%), SA 124 (12%); cryptogenic: NA 311 (28.5%), SA 239 (23%)]. Some specific neuropathy comparisons were hereditary neuropathies [Charcot-Marie-Tooth (CMT) cases] in NA 246/292 (84.2%) and SA 60/103 (58%); familial amyloid neuropathy in SA 31/103 (30%) and none in NA. Among infectious neuropathies, cases of human T-lymphotropic virus type 1 (HTLV-1) neuropathy in SA were 36/141(25%), Chagas disease in SA were 13/141(9%) and none for either in NA; cases of neuropathy due to leprosy in NA were 26/53 (49%) and in SA were 39/141(28%). South American tertiary care centers are more likely to see patients with infectious, diabetic and hereditary disorders such as familial amyloid neuropathies. North American tertiary centers are more likely to see patients with CMT. Immune neuropathies and cryptogenic neuropathies were seen equally in North America and South America.

  4. Paisagismo e modernidade na europa na década de 1920

    Directory of Open Access Journals (Sweden)

    Euler Sandeville Júnior

    2007-12-01

    Full Text Available Experiências formais realizadas a partir do final da Primeira Guerra deram novo impulso à reformulação das concepções então correntes para os jardins. Notamos algumas tendências contrastantes que coexistiam nessa época: uma, então dominante, representada por um ambiente profissional respondendo a uma demanda particular e do Estado, de caráter conservador e nacionalista, outras, de renovação, representadas por paisagistas e por arquitetos de alguma forma vinculados às vanguardas. O objetivo deste trabalho é destacar duas tendências modernizantes atuando na produção paisagística na Europa dos anos de 1920. Uma delas, desenvolvida por paisagistas e arquitetos, mostra forte influência do cubismo e do expressionismo, convergindo para o art déco, dotada de forte conotação decorativa. Gabriel Guevrekian e Robert Mallet-Stevens, são alguns dos representantes dessa tendência. Outra tendência modernizante deve-se à atuação de representantes do nascente movimento moderno em arquitetura, tanto em sua abordagem dos jardins como também nos conceitos que empregaram na criação de espaços externos. Entre a ampla gama de experiências nesse sentido, vêem-se as posturas bem diversas apresentadas por arquitetos como Le Corbusier e Erik Gunnar Asplund.

  5. Synthesis and Structure of 1D Na6 Cluster Chain with Short Na-Na Distance: Organic like Aromaticity in Inorganic Metal Cluster

    CERN Document Server

    Khatua, S; Chattaraj, P K; Roy, D R; Bhattacharjee*, Manish; Chattaraj*, Pratim K.; Khatua, Snehadrinarayan; Roy, Debesh R.

    2006-01-01

    A unique 1D chain of sodium cluster containing (Na6) rings stabilized by a molybdenum containing metalloligand has been synthesized and characterized. DFT calculations show striking resemblance in their aromatic behaviour with the corresponding hydrocarbon analogues

  6. Thermochemistry in the systems Na-O-C, Na-Al-O-C and Na-C-N with respect to interactions of oxygen, carbon and nitrogen in sodium

    International Nuclear Information System (INIS)

    The results of three systematic thermochemical calculations (Na-O-C, Na-Al-O-C, and Na-N-C) are presented. The results are the basis for further calculations, for example in the system Na-O-N-C. Data and method of calculations are shown with tables. Results are given with ten detailed figures of the systems at various temperatures

  7. Transepithelial Na+ transport and the intracellular fluids: a computer study.

    Science.gov (United States)

    Civan, M M; Bookman, R J

    1982-01-01

    Computer simulations of tight epithelia under three experimental conditions have been carried out, using the rheogenic nonlinear model of Lew, Ferreira and Moura (Proc. Roy. Soc. London. B 206:53-83, 1979) based largely on the formulation of Koefoed-Johnsen and Ussing (Acta Physiol. Scand. 42: 298-308. 1958). First, analysis of the transition between the short-circuited and open-circuited states has indicated that (i) apical Cl- permeability is a critical parameter requiring experimental definition in order to analyze cell volume regulation, and (ii) contrary to certain experimental reports, intracellular Na+ concentration (ccNa) is expected to be a strong function of transepithelial clamping voltage. Second, analysis of the effects of lowering serosal K+ concentration (csK) indicates that the basic model cannot simulate several well-documented observations; these defects can be overcome, at least qualitatively, by modifying the model to take account of the negative feedback interaction likely to exist between the apical Na+ permeability and ccNa. Third, analysis of the strongly supports the concept that osmotically induced permeability changes in the apical intercellular junctions play a physiological role in conserving the body's stores of NaCl. The analyses also demonstrate that the importance of Na+ entry across the basolateral membrane is strongly dependent upon transepithelial potential, cmNa and csK; under certain conditions, net Na+ entry could be appreciably greater across the basolateral than across the apical membrane. PMID:7057462

  8. Transepithelial Na+ transport and the intracellular fluids: a computer study.

    Science.gov (United States)

    Civan, M M; Bookman, R J

    1982-01-01

    Computer simulations of tight epithelia under three experimental conditions have been carried out, using the rheogenic nonlinear model of Lew, Ferreira and Moura (Proc. Roy. Soc. London. B 206:53-83, 1979) based largely on the formulation of Koefoed-Johnsen and Ussing (Acta Physiol. Scand. 42: 298-308. 1958). First, analysis of the transition between the short-circuited and open-circuited states has indicated that (i) apical Cl- permeability is a critical parameter requiring experimental definition in order to analyze cell volume regulation, and (ii) contrary to certain experimental reports, intracellular Na+ concentration (ccNa) is expected to be a strong function of transepithelial clamping voltage. Second, analysis of the effects of lowering serosal K+ concentration (csK) indicates that the basic model cannot simulate several well-documented observations; these defects can be overcome, at least qualitatively, by modifying the model to take account of the negative feedback interaction likely to exist between the apical Na+ permeability and ccNa. Third, analysis of the strongly supports the concept that osmotically induced permeability changes in the apical intercellular junctions play a physiological role in conserving the body's stores of NaCl. The analyses also demonstrate that the importance of Na+ entry across the basolateral membrane is strongly dependent upon transepithelial potential, cmNa and csK; under certain conditions, net Na+ entry could be appreciably greater across the basolateral than across the apical membrane.

  9. Risbjerg: SF vandt valgkampen, NA og R tabte

    DEFF Research Database (Denmark)

    Thomsen, Søren Risbjerg

    2007-01-01

    ANALYSE: Endnu engang flyttede en valgkamp for alvor stemmer. SF gik undervejs 27 pct. frem, mens NA gik 34 pct. tilbage og R 26 pct. Udgivelsesdato: 25. november......ANALYSE: Endnu engang flyttede en valgkamp for alvor stemmer. SF gik undervejs 27 pct. frem, mens NA gik 34 pct. tilbage og R 26 pct. Udgivelsesdato: 25. november...

  10. UTJECAJ NEKIH ČIMBENIKA NA KVALITETU GEOMAGNETSKIH MJERENJA

    OpenAIRE

    Gregl, Tihomir

    1998-01-01

    S razvojem konstrukcije magnetometara povećala se njihova osjetljivost. Time je omogućeno mjerenje i slabijeg intenziteta magnetskog polja Zemlje (tzv, korisni signal), ali je na kvalitetu rezultata mjerenja povećan utjecaj raznih čimbenika (tzv. šum smetnji). Zbog toga se pristupilo analizi utjecaja nekih čimbenika na kvalitetu mjerenja.

  11. Transmission channels through Na and Al atom wire

    DEFF Research Database (Denmark)

    Kobayashi, N.; Brandbyge, Mads; Tsukada, M.

    1999-01-01

    First-principles calculations of the transmission channels of single-atom-width Na and Al atom wires bridged between metallic jellium electrodes are presented. For the Na wire, a single channel contributes to the conduction with an almost full quantization value, 2e(2)/h. The conductance...

  12. The pea gene NA encodes ent-kaurenoic acid oxidase.

    Science.gov (United States)

    Davidson, Sandra E; Elliott, Robert C; Helliwell, Chris A; Poole, Andrew T; Reid, James B

    2003-01-01

    The gibberellin (GA)-deficient dwarf na mutant in pea (Pisum sativum) has severely reduced internode elongation, reduced root growth, and decreased leaflet size. However, the seeds develop normally. Two genes, PsKAO1 and PsKAO2, encoding cytochrome P450 monooxygenases of the subfamily CYP88A were isolated. Both PsKAO1 and PsKAO2 had ent-kaurenoic acid oxidase (KAO) activity, catalyzing the three steps of the GA biosynthetic pathway from ent-kaurenoic acid to GA(12) when expressed in yeast (Saccharomyces cerevisiae). In addition to the intermediates ent-7alpha-hydroxykaurenoic acid and GA(12)-aldehyde, some additional products of the pea KAO activity were detected, including ent-6alpha,7alpha-dihydroxykaurenoic acid and 7beta-hydroxykaurenolide. The NA gene encodes PsKAO1, because in two independent mutant alleles, na-1 and na-2, PsKAO1 had altered sequences and the five-base deletion in PsKAO1 associated with the na-1 allele cosegregated with the dwarf na phenotype. PsKAO1 was expressed in the stem, apical bud, leaf, pod, and root, organs in which GA levels have previously been shown to be reduced in na plants. PsKAO2 was expressed only in seeds and this may explain the normal seed development and normal GA biosynthesis in seeds of na plants.

  13. Sepsis does not alter red blood cell glucose metabolism or Na+ concentration: A 2H-, 23Na-NMR study

    International Nuclear Information System (INIS)

    The effects of sepsis on intracellular Na+ concentration ([Na+]i) and glucose metabolism were examined in rat red blood cells (RBCs) by using 23Na- and 2H-nuclear magnetic resonance (NMR) spectroscopy. Sepsis was induced in 15 halothane-anesthetized female Sprague-Dawley rats by using the cecal ligation and perforation technique; 14 control rats underwent cecal manipulation without ligation. The animals were fasted for 36 h, but allowed free access to water. At 36 h postsurgery, RBCs were examined by 23Na-NMR by using dysprosium tripolyphosphate as a chemical shift reagent. Human RBCs from 17 critically ill nonseptic patients and from 7 patients who were diagnosed as septic were also examined for [Na+]i. Five rat RBC specimens had [Na+]i determined by both 23Na-NMR and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). For glucose metabolism studies, RBCs from septic and control rats were suspended in modified Krebs-Henseleit buffer containing [6,6-2H2]glucose and examined by 2H-NMR. No significant differences in [Na+]i or glucose utilization were found in RBCs from control or septic rats. There were no differences in [Na+]i in the two groups of patients. The [Na+]i determined by NMR spectroscopy agreed closely with measurements using ICP-AES and establish that 100% of the [Na+]i of the RBC is visible by NMR. Glucose measurements determined by 2H-NMR correlated closely (correlation coefficient = 0.93) with enzymatic analysis. These studies showed no evidence that sepsis disturbed RBC membrane function or metabolism

  14. Sepsis does not alter red blood cell glucose metabolism or Na+ concentration: A 2H-, 23Na-NMR study

    Energy Technology Data Exchange (ETDEWEB)

    Hotchkiss, R.S.; Song, S.K.; Ling, C.S.; Ackerman, J.J.; Karl, I.E. (Washington Univ. School of Medicine, St. Louis (USA))

    1990-01-01

    The effects of sepsis on intracellular Na+ concentration ((Na+)i) and glucose metabolism were examined in rat red blood cells (RBCs) by using 23Na- and 2H-nuclear magnetic resonance (NMR) spectroscopy. Sepsis was induced in 15 halothane-anesthetized female Sprague-Dawley rats by using the cecal ligation and perforation technique; 14 control rats underwent cecal manipulation without ligation. The animals were fasted for 36 h, but allowed free access to water. At 36 h postsurgery, RBCs were examined by 23Na-NMR by using dysprosium tripolyphosphate as a chemical shift reagent. Human RBCs from 17 critically ill nonseptic patients and from 7 patients who were diagnosed as septic were also examined for (Na+)i. Five rat RBC specimens had (Na+)i determined by both 23Na-NMR and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). For glucose metabolism studies, RBCs from septic and control rats were suspended in modified Krebs-Henseleit buffer containing (6,6-2H2)glucose and examined by 2H-NMR. No significant differences in (Na+)i or glucose utilization were found in RBCs from control or septic rats. There were no differences in (Na+)i in the two groups of patients. The (Na+)i determined by NMR spectroscopy agreed closely with measurements using ICP-AES and establish that 100% of the (Na+)i of the RBC is visible by NMR. Glucose measurements determined by 2H-NMR correlated closely (correlation coefficient = 0.93) with enzymatic analysis. These studies showed no evidence that sepsis disturbed RBC membrane function or metabolism.

  15. Vpliv Kariernega centra UM FOV na kariero študenta

    OpenAIRE

    Gorjanc, Petra

    2016-01-01

    Trg dela in spremembe, ki so povezane z njim, študente že v času študija spodbujajo k načrtovanju njihovih karier, saj se v današnjem svetu številni diplomanti ob prehodu na trg dela soočijo z dejstvom, da je konkurenca med mladimi iskalci zaposlitve neizprosna. Za enostavnejši prehod študentov na trg dela na visokošolskih zavodih skrbijo karierni centri, ki študentom v času študija pomagajo pri razvoju njihovih karier, jih spodbujajo pri pridobivanju novih znanj ter obveščajo o novostih na t...

  16. The New Readout System of the NA62 LKr Calorimeter

    CERN Document Server

    Ceccucci, A; Farthouat, P; Lamanna, G; Rouet, J; Ryjov, V; Venditti, S

    2015-01-01

    The NA62 experiment [1] at CERN SPS (Super Proton Synchrotron) accelerator aims at studying Kaon decays with high precision. The high resolution Liquid Krypton (LKr) calorimeter, built for the NA48 [2] experiment, is a crucial part of the photon-veto system; to cope with the demanding NA62 re- quirements,itsback-endelectron icshadtobecompletelyrenewed. The new readout system is based on the Calorimeter REAdout Module (CREAM) [3], a 6U VME board whose design and pro- duction was sub-contracted to CAEN [4], with CERN NA62 group continuously supervising the de velopment and production phase. The first version of the board was delivered by the manufacturer in March 2013 and, as of June 2014, the full board production is ongoing. In addition to describing the CREAM board, all aspects of the new LKr readout system, including its integration within the NA62 TDAQ scheme, will be treated.

  17. Probabilidades de ruína e o modelo binomial

    OpenAIRE

    Jerónimo, Isabel Brandão

    2004-01-01

    Mestrado em Ciências Actuariais Nesta dissertação, vamos apresentar o modelo binomial composto em tempo discreto e calcular probabilidades de ruína. Do ponto de vista da probabilidade de ruína em tempo finito, em vez de ter em linha de conta o instante temporal em que a ruína ocorre, estudamos a probabilidade da ruína ocorrer na n-ésima indemnizacão e o número de indem¬nizações ocorridas durante o período de recuperação do processo de risco. O nosso objectivo e, não só, obter resultados nu...

  18. Status of the KIMS-NaI experiment

    CERN Document Server

    Kim, Kyungwon

    2015-01-01

    KIMS-NaI is a direct detection experiment searching for Weakly Interacting Massive Particles (WIMP) via their scattering off of nuclei in a NaI(Tl) crystal. The KIMS-NaI collaboration has carried out tests of six crystals in the Yangyang underground laboratory in order to develope low-background NaI(Tl) crystals. Studies of internal backgrounds crystals have been performed with the goal of reducing backgrounds levels to 1 dru at 2 keV. Pulse shape discrimination (PSD) capabilities were also investigated for distinguishing between WIMP nuclear recoil signals and electron recoil backgrounds. The PSD analysis was applied to underground data with one low background NaI(Tl) detector and the evaluation of WIMP mass limit is ongoing.

  19. Absorto na ação

    Directory of Open Access Journals (Sweden)

    Michael Fried

    2010-07-01

    Full Text Available O filme Zidane, um retrato do século XXI, de Douglas Gordon e Philippe Parreno (2006 pertence à tradição de absorção que desempenhou um papel crucial na evolução da arte moderna. O autor explora a tensão entre absorção e teatralidade - central tanto para a pintura francesa do século XVIII como para a fotografia dos séculos XX e XXI - e tira conseqüências estéticas e filosóficas do filme que retrata, ao longo de todos os noventa minutos de uma partida de futebol, o meio-campista francês Zinedine Zidane.Zidane, a 21st Century Portrait, a film by Douglas Gordon and Philippe Perreno, belongs to the absorptive tradition that has played a central role in the evolution of modern art. The author explores the tension between absorption and theatricality - crucial to 18th century French art as well as to 20th and 21th century photography - and draws aesthetic and philosophical consequences of this film that depicts, throughout all the 90 minutes of a soccer match, the French midfielder Zinedine Zidane.

  20. Endurance testing with Li/Na electrolyte

    Energy Technology Data Exchange (ETDEWEB)

    Ong, E.T.; Remick, R.J.; Sishtla, C.I. [Institute of Gas Technology, Des Plaines, IL (United States)

    1996-12-31

    The Institute of Gas Technology (IGT), under subcontract to M-C Power Corporation under DOE funding, has been operating bench-scale fuel cells to investigate the performance and endurance issues of the Li/Na electrolyte because it offers higher ionic conductivity, higher exchange current densities, lower vapor pressures, and lower cathode dissolution rates than the Li/K electrolyte. These cells have continued to show higher performance and lower decay rates than the Li/K cells since the publication of our two previous papers in 1994. In this paper, test results of two long-term 100-cm{sup 2} bench scale cells are discussed. One cell operated continuously at 160 mA/cm{sup 2} for 17,000 hours with reference gases (60H{sub 2}/20CO{sub 2}/20H{sub 2}O fuel at 75% utilization and 30CO{sub 2}/70 air oxidant humidified at room temperature at 50% utilization). The other cell operated at 160 mA/cm{sup 2} for 6900 hours at 3 atm with system gases (64H{sub 2}/16CO{sub 2}/20H{sub 2}O at 75% utilization and an M-C Power system-defined oxidant at 40% utilization). Both cells have shown the highest performance and longest endurance among IGT cells operated to date.

  1. A Avaliacäo na Narrativa

    Directory of Open Access Journals (Sweden)

    Solange de Azambuja Lira

    2008-04-01

    Full Text Available Neste trabalho pretendo analisar e discutir o papel da avaliação na narrativa de acordo com o modelo de Labov A avaliação segundo Labov e Waletzky (1967 e Labov (1972 a uma suspensão da ação básica da narrativa que tem por finalidade informar sobre a carga dramática ou o clima emocional da situação, eventos e protagonistas. E, segundo Labov, a razão de ser da narrativa, o meio que o narrador tem de indicar porque a estória e digna de ser narrada. Com a avaliação o narrador pode também enfatizar mais certos eventos do que outros e aumentar a sua influência no desenrolar dos eventos. A avaliação é um dos elementos estruturais da narrativa. Labov (1972:359-360 define a narrativa como "um metodo de recapitulação de experiências passadas Combinando uma sequência verbal de oracões a sequência de eventos que (segundo se infere ocorreram efetivamente." Os outros elementos estruturais da narrativa são: sínopse onde temos os eventos mais salientes da narrativa de uma forma resumida.

  2. The NA48 LKr calorimeter readout electronics

    CERN Document Server

    Gianoli, A; Barr, C; Brodier-Yourstone, P; Buchholz, P; Ceccucci, Augusto; Cerri, C; Chlopik, A; Constantini, F; Fantechi, R; Formenti, F; Funk, W; Giudici, Sergio; Gorini, B; Guzik, J A; Hallgren, Björn I; Kozhevnikov, Yu; Iwansky, W; de La Taille, C; Lacourt, A; Laverrière, G C; Ljuslin, C; Mannelli, I; Martin-Chassard, G; Martini, M; Papi, A; Seguin-Moreau, N; Sozzi, M; Tarlé, J C; Velasco, M; Vossnack, O; Wahl, H; Ziolkowski, M

    2000-01-01

    The NA48 experiment at the CERN SPS accelerator is making a measurement of the direct CP violation parameter epsilon '/ epsilon by comparing the four rates of decay of K/sub S/ and K/sub L/ into 2 pi /sup 0/ and pi /sup +/ pi /sup -/. To reconstruct the decays into 2 pi /sup 0/ the information from the almost 13500 channels of a quasi-homogeneous liquid krypton electromagnetic calorimeter is used. The readout electronics of the calorimeter has been designed to provide a dynamic range from a few MeV to about 50 GeV energy deposition per cell, and to sustain a high rate of incident particles. The system is made by cold charge preamplifiers (working at 120 degrees K), low-noise fast shapers followed by digitizer electronics at 40 MHz sampling rate that employs a gain switching technique to expand the dynamic range, where the gain can be selected for each sample individually (i.e. every 25 ns). To reduce the amount of data collected the system contains a zero suppression circuit based on halo expansion. (12 refs)...

  3. Kusheh, na minem Fatu, en mi na koko farmer Hello, I am Fatu and I am a cocoa farmer

    NARCIS (Netherlands)

    Witteveen, L.M.; Goris, Margriet; Lie, R.; Ingram, V.J.

    2016-01-01

    This document reports on the development of a prototype Digital Farmer Field School (DFFS) called Kusheh, na minem Fatu, en mi na koko farmer (“Hello, I am Fatu and I am a cocoa farmer”). The DFFS provides an ICT-based alternative to traditional agricultural extension. More specifically, it offers a

  4. Čagalj (Canis aureus L.) na poluotoku Pelješcu (južna Dalmacija, Hrvatska)

    OpenAIRE

    Krofel, M.

    2007-01-01

    Rad donosi rezultate istraživanja čagljeva na poluotoku Pelješcu. Prisutnost čagljeva potvrđena je na većem dijelu poluotoka, a najviše ih je zabilježeno u središnjem dijelu. Sadržaj izmeta pokazuje raznolik sastav ishrane čagljeva.

  5. Thermodiffusive behaviour of NaCl and KCl aqueous solutions a model for the Na-K pump

    International Nuclear Information System (INIS)

    In NaCl and KCl aqueous nonisothermal solutions K+ inverts its sense of migration within the physiological concentration range; Na+ behaves similarly at much lower concentrations. These findings are discussed in relation to solute induced modifications of water structure and of their influence on thermal diffusion. A possible evolutionary model of a thermodiffusive mechanism for the sodium potassium pump is also suggested

  6. IMPACTS OF SEWAGE SLUDGE APPLICATION ON SUGARCANE CROP AND ON ENVIRONMENT = IMPACTOS DA APLICAÇÃO DE LODO DE ESGOTO NA CULTURA DA CANA-DE-AÇÚCAR E NO AMBIENTE

    Directory of Open Access Journals (Sweden)

    Fabio Cesar da Silva

    2010-01-01

    íveis impactos ambientais devido à presença de metais pesados em um Argissolo Vermelho-Amarelo distrófico. O LE foi aplicado nas doses de 0, 20 e 40 t ha 1 (material úmido, com 620 g kg-1 de água e o N, P e K, respectivamente, nas doses de 34, 60 e 83 kg ha-1. Em amostras de folhas +1 da cana-de-açúcar, coletadas aos 146 dias após o plantio (dap, e de parte aérea total (colmo + folha, coletadas na época da colheita, foram analisados os teores de nutrientes e metais traços. O LE se mostrou adequado como fertilizante para a cana-de-açúcar, em cultivo de 18 meses, fornecendo principalmente Ca, P, S e Zn, aumentando a atividade da fosfatase ácida e a produtividade de biomassa e de açúcar em função linear das doses de LE. Dentre os nutrientes fornecidos pelo LE, constatou-se que o P não foi o único responsável pelo aumento da produtividade de colmos, devido aumento da taxa fotossintética, pois houve alteração no balanço secundário das fosfatases ácidas por Cu, Zn e B, como prováveis catalisadores enzimáticos. Houve aumentos nas exportações de N, Ca, P, Mg, S, Se, Fe, Al, Cu, B, Cd e Zn pela parte aérea com a adição de LE, causados pelos acréscimos dos teores de B, Ca, Cu, S e Zn no tecido vegetal e/ou, pela maior produtividade de biomassa. Comparando-se as quantidades de nutrientes exportadas pela parte aérea com aquelas adicionadas ao solo pela aplicação de 40 t ha 1 de LE, constatou-se que as entradas foram positivas, exceto para o B e K, cujo balanço foi negativo.

  7. Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold

    CERN Document Server

    Xu, Jingke; Calaprice, Frank; Westerdale, Shawn; Froborg, Francis; Suerfu, Burkhant; Alexander, Thomas; Aprahamian, Ani; Back, Henning O; Casarella, Clark; Fang, Xiao; Gupta, Yogesh K; Ianni, Aldo; Lamere, Edward; Lippincott, W Hugh; Liu, Qian; Lyons, Stephanie; Siegl, Kevin; Smith, Mallory; Tan, Wanpeng; Kolk, Bryant Vande

    2015-01-01

    The dark matter interpretation of the DAMA modulation signal depends on the NaI(Tl) scintillation efficiency of nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in the DAMA/LIBRA modulation energy region. We report a quenching effect measurement of Na recoils in NaI(Tl) from 3keV$_{\\text{nr}}$ to 52keV$_{\\text{nr}}$, covering the whole DAMA/LIBRA energy region for light WIMP interpretations. By using a low-energy, pulsed neutron beam, a double time-of-flight technique, and pulse-shape discrimination methods, we obtained the most accurate measurement of this kind for NaI(Tl) to date. The results differ significantly from the DAMA reported values at low energies, but fall between the other previous measurements. We present the implications of the new quenching results for the dark matter interpretation of the DAMA modulation signal.

  8. Efeito do corte como dano mecânico na qualidade e na fisiologia de mamões 'golden'

    OpenAIRE

    Jaqueline Visioni Tezotto; Angelo Pedro Jacomino; Ana Elisa de Godoy; Elaine Costa Cerqueira-Pereira; Camilla Zanotti Gallon

    2011-01-01

    A redução na qualidade pós-colheita do mamão deve-se em grande parte aos danos mecânicos, especialmente àqueles do tipo corte. O objetivo deste trabalho foi reproduzir este dano mecânico e avaliar os efeitos do número de cortes na qualidade e na fisiologia pós-colheita de mamões 'Golden'. Os cortes foram obtidos com o uso de uma lâmina de aço de 30 mm de comprimento e 5 mm de profundidade. Os tratamentos consistiram na reprodução de 1 a 4 cortes na região mediana dos frutos. Mamões sem cortes...

  9. Corrosion Behaviours of Copper Alloy in Solutions Containing Na2SO4 and NaCl with Different Concentrations

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Potentiodynamic polarisation, potential-time measurements, X-ray diffraction (XRD) and infrared spectroscopy (IR)have been used to investigate the effect of different concentrations of Na2SO4 in the absence and presence of NaCl,on the corrosion of Cu-alloy. The electrochemical measurements showed that the increase of Na2SO4 concentration led to increase the corrosion current density of Cu alloy and vice versa. The presence of NaCl shifted the potential to more cathodic potential, which had a great influence on the protectiveness of the Cu oxide layer formed on the surface in presence of Na2SO4. The spectrometric measurements indicated the constituents of the film formed on the alloy surface were mainly Cu2O, in addition to the oxides, NiO and Fe2O3, which were traced by XRD analysis.

  10. Thermochemistry in the systems Na-O-C, Na-Al-O-C and Na-C-N with respect to interactions of oxygen, carbon and nitrogen in sodium

    International Nuclear Information System (INIS)

    Thermochemical calculations have been performed in the systems Na-O-C, Na-Al-O-C and Na-C-N. Metallurgical phase diagrams are presented in the temperature range 700 K-1100 K. At T >= 932 K Na2CO3 can be in equilibrium with sodium and strong interactions between dissolved carbon and oxygen are therefore expected. This conclusion agrees with experimental results of Ainsley et al. If Al2O3 or Al is added to the system, the field of existence of sodium is limited by NaAlO2 and graphite, while Na2O, Na2CO3 and Al2O3 cannot be in equilibrium with Na anymore. If the carbon activities are high enough, Al4C3 is stable in sodium even in the presence of NaAlO2. Measurements of the carbon solubility in which alumina crucibles are used can therefore result in too high solubilities because of formation of Al4C3. The system Na-C-N is described in the temperature range 800 K-1000 K taking into account Na3N, NaCN and Na2NCN. Nitrogen pressures larger than about 1 atm result in Na/Na2NCN equilibria if saturation of the sodium is achieved. This might be a reason for the extremely low solubility of nitrogen in sodium in contrast to nitrogen in Lithium, where the terminal solubility is determined by Li3N. (orig.)

  11. Texturization of monocrystalline silicon with Na2CO3/NaHCO3 solution%使用Na2CO3/NaHCO3体系进行单晶硅制绒

    Institute of Scientific and Technical Information of China (English)

    张启华; 汤俊琪; 满石清

    2013-01-01

    The conversion efficiency of solar cell could be improved by reducing the reflectivity of solar panel by texturing the panel surface. In this study, the surfaces of monocrystalline silicon chips, a common type of solar panel, were texturized with Na2CO3, NaHCO3 and Na2CO3/NaHCO3 solution. The morphology and reflectivity of the texturized surfaces were characterized with scanning electron microscope (SEM) and UV-Vis spectrophotometer, respectively, and the effects of solution concentration, solution composition and reaction time on the reflectivity of the texturized surfaces were studied. The results show that a texturized surface with a reflectivity of 15.22% can be prepared by immersing the silicon chip in the Na2CO3/NaHCO3 solution containing 12wt% Na2CO3 and 1.2wt% for 10 minutes at 85 ℃.%通过单晶硅表面制绒可以降低太阳能电池面板对光的反射率进而提高电池的转化效率.利用Na2CO3、NaHCO3和Na2CO3/NaHCO3溶液进行了单晶硅表面制线,并利用扫描电子显微镜和紫外/可见光光度计对所得绒面的形貌及反色率分别进行了分析.研究了溶液浓度、溶液组成及反应时间等因素对所制单晶硅绒面反射率的影响.结果表明:在Na2CO3∶NaHCO3质量比为10∶1,反应温度为85℃,反应时间为10 min时,可获得反射率为15.22%的绒面.

  12. Preparation of Al-La Master Alloy by Thermite Reaction in NaF-NaCl-KCl Molten Salt

    Science.gov (United States)

    Jang, Poknam; Li, Hyonmo; Kim, Wenjae; Wang, Zhaowen; Liu, Fengguo

    2015-05-01

    A NaF-NaCl-KCl ternary system containing La2O3 was investigated for the preparation of Al-La master alloy by the thermite reaction method. The solubility of La2O3 in NaF-NaCl-KCl molten salt was determined by the method of isothermal solution saturation. Inductively coupled plasma-optical emission spectroscopy and x-ray diffraction (XRD) analyses were used to consider the content of La2O3 in molten salt and the supernatant composition of molten salt after dissolution of La2O3, respectively. The results showed that the content of NaF had a positive influence on the solubility of La2O3 in NaF-NaCl-KCl molten salts, and the solubility of La2O3 could reach 8.71 wt.% in molten salts of 50 wt.%NaF-50 wt.% (44 wt.%NaCl + 56 wt.%KCl). The XRD pattern of cooling molten salt indicated the formation of LaOF in molten salt, which was probably obtained by the reaction between NaF and La2O3. The kinetic study showed that the thermite reaction was in accord with a first-order reaction model. The main influence factors on La content in the Al-La master alloy product, including molten salt composition, amount of Al, concentration of La2O3, stirring, reduction time and temperature, were investigated by single-factor experimentation. The content of La in the Al-La master alloy could be reached to 10.1 wt.%.

  13. Thermodynamics of the NaCl–KCl system

    International Nuclear Information System (INIS)

    Highlights: • The complementary methods of DSC, DTA, DROP and XRD analyses were used. • The heat capacity of solid phase of the NaCl–KCl mixtures was measured. • The heat capacity of liquid phase of the 50NaCl–50KCl mixture was obtained. • The enthalpy of fusion and solid solution formation were determined. • The thermodynamic functions of the 50NaCl–50KCl mixture were calculated. - Abstract: The heat capacity of the solid phase of the NaCl–KCl mixtures was measured by the differential scanning calorimetry. These results and X-ray diffraction data were used for the explanation of the solid solution formation. The heat capacity of the liquid phase of the eutectic 50NaCl–50KCl mixture has been obtained in a closed glass container. The enthalpy increment (H°T − H°298.15) and the fusion enthalpy of the 50NaCl–50KCl mixture have been measured by a drop calorimeter. The joint analysis of these values with the heat capacity data allowed the calculation of the enthalpy of the solid solution. As the final result, the thermodynamic functions of the eutectic 50NaCl–50KCl mixture have been obtained

  14. Tlačna i posmična otpornost sveze kompozita i dentina

    OpenAIRE

    Šutalo, Jozo; Šegović, Sanja; Anić, Ivica

    1993-01-01

    Ispitivana je mehanička otpornost triju kompozitnih materijala i sveze dentinskoga adheziva Syntaca s dentinom. Kompozitne smole (Fluorocore, Coradent i Coracore) rabljene su za izradbu nadgradnje na korijenskom dentinu pretkutnjaka. Kompozitne nadogradnje (22) tlačene su okomito i paralelno (23) s uzdužnom osi zuba dok nije puknula nadgradnja, sveza ili dentin. Sva tri materijala pokazala su klinički dovoljnu tlačnu, ali ne i posmičnu otpornost. Za opsežnije kompozitne nadgradnje vitalnih zu...

  15. Marketing na imprensa : os jornais na era digital : estudo de caso do Jornal I

    OpenAIRE

    Casanova, Steffany da Forte

    2014-01-01

    O presente relatório trata o estudo de caso do Jornal i, um jornal generalista, diário, português, relativamente ao marketing na imprensa e adaptação da mesma ao meio digital online. Este tema ganha importância no contexto atual da imprensa portuguesa, nomeadamente no que concerne à presença digital dos diferentes meios e ao impacto dessa mesma presença no seu sucesso. A relevância deste tema ganha maior destaque considerando o seu objeto de estudo: o Jornal i. Um jornal português, nascido si...

  16. = Impacto da diabetes na exocitose-libertação de neurotransmissores na retina

    OpenAIRE

    Baptista, Filipa Isabel Cabaço

    2012-01-01

    A retinopatia diabética é uma das principais causas de perda de visão e cegueira no mundo. Esta patologia é considerada uma doença vascular. No entanto, tem sido demonstrado que a parte neural da retina também é afetada, mesmo antes de serem detetadas lesões microvasculares. As alterações registadas em eletroretinogramas de pacientes e animais diabéticos, e a perda de sensibilidade à cor e ao contraste são sinais precoces de disfunção neuronal na retina. Contudo, as alterações ...

  17. Razvoj na marginama: egzistencija i održivost zajednica na malezijskoindonezijskoj granici

    OpenAIRE

    Junaenah, Sulehan; Noor, Rahamah Abu Bakar; Abd Hair, Awang; Mohd, Yusof Abdullah; Ong, Puay Liu

    2014-01-01

    Male zajednice koje žive na marginama razvoja općenito se suočavaju s brojnim problemima i izazovima. Premda je opstojnost njihova glavna briga, integracija u glavne razvojne tokove paradoksalno ostaje dalek i nerješiv problem. Stoga ovaj članak ima tri cilja. Prvo, u njemu se bavimo socio-ekonomskom dinamikom Sarawak-Kalimantan pograničnih zajednica čija sela ostaju izvan glavnih tokova razvoja. Nedavno su sela i manji gradovi uz ovu granicu privukli pažnju medija, političara,...

  18. Respiratory complex I: A dual relation with H(+) and Na(+)?

    Science.gov (United States)

    Castro, Paulo J; Silva, Andreia F; Marreiros, Bruno C; Batista, Ana P; Pereira, Manuela M

    2016-07-01

    Respiratory complex I couples NADH:quinone oxidoreduction to ion translocation across the membrane, contributing to the buildup of the transmembrane difference of electrochemical potential. H(+) is well recognized to be the coupling ion of this system but some studies suggested that this role could be also performed by Na(+). We have previously observed NADH-driven Na(+) transport opposite to H(+) translocation by menaquinone-reducing complexes I, which indicated a Na(+)/H(+) antiporter activity in these systems. Such activity was also observed for the ubiquinone-reducing mitochondrial complex I in its deactive form. The relation of Na(+) with complex I may not be surprising since the enzyme has three subunits structurally homologous to bona fide Na(+)/H(+) antiporters and translocation of H(+) and Na(+) ions has been described for members of most types of ion pumps and transporters. Moreover, no clearly distinguishable motifs for the binding of H(+) or Na(+) have been recognized yet. We noticed that in menaquinone-reducing complexes I, less energy is available for ion translocation, compared to ubiquinone-reducing complexes I. Therefore, we hypothesized that menaquinone-reducing complexes I perform Na(+)/H(+) antiporter activity in order to achieve the stoichiometry of 4H(+)/2e(-). In agreement, the organisms that use ubiquinone, a high potential quinone, would have kept such Na(+)/H(+) antiporter activity, only operative under determined conditions. This would imply a physiological role(s) of complex I besides a simple "coupling" of a redox reaction and ion transport, which could account for the sophistication of this enzyme. This article is part of a Special Issue entitled Respiratory complex I, edited by Volker Zickermann and Ulrich Brandt. PMID:26711319

  19. Cidade-ciborgue: a cidade na cibercultura

    Directory of Open Access Journals (Sweden)

    André Lemos

    2008-11-01

    Full Text Available As cidades contemporâneas passam por transfigurações importantes com o advento das novas tecnologias da comunicação e informação e, embora toda cidade seja um artefato complexo composto por diversas redes materiais e espirituais (Saint Simon, podemos ver as atuais cidades como uma cidade-ciborgue. O objetivo deste artigo é descrever e analisar as principais transformações pelas quais passa o espaço urbano na atual cibercultura. Torna-se urgente compreender as transformações da cidade contemporânea em meio às novas tecnologias de base micro-eletrônica e de telecomunicações. Pretendemos aqui abordar a questão das cidades da cibercultura sob o prisma do que chamaremos "cidade-ciborgue". Palavras-chave cibercultura, cibercidade, cidade, comunicação Abstract Cities have been through major transformations due to information and communication technologies. Although every city is a complex artifact made of several material and spiritual networks (Saint Simon, we can view our modern cities as cyborg-cities. The aim of this paper is to describe and analyze some major changes in the urban space in terms of cyberculture. There is a need to understand the transformations of the contemporary city in face of the new technologies of telecommunications and microelectronics. We intend to approach the subject of cities and cyberculture from the point of view of what we are calling "the cyborg-city". Key words cyberculture, cybercity, city, communication

  20. Epidemiologia da raiva humana na Guanabara

    Directory of Open Access Journals (Sweden)

    Alfredo R. Matta B. da Silva

    1971-08-01

    Full Text Available A raiva humana se mantém como problema de Saúde Pública, especialmente nas áreas urbanas, onde o cão atua como principal reservatório e fonte imediata de infecção. A deficiência de programas de controle de cães vadios, de imunização sistemática e de educação sanitária, contribui para a perpetuação da cadeia epidemiológioa. O presente estudo analisa todos os casos de raiva humana, observados em habitantes do Estado da Guanabara, no período 1965-1969, segundo as variáveis: idade, sexo, côr, variação estacional, período de incubação e de duração da fase clínica, fonte de infecção, local de mordedura e uso de vacina posterior à exposição. Os principais resultados foram: 1. A ravia na Guanabara, parece ser mais comum nos grupos etários mais jovens e nos homens. 2. Não se observou variação estacional. 3. O período de incubação mediano foi de 45 dias e de duração da fase clínica de 3 dias. 4. Ocorreu uma associação entre período de incubação menor e vacinação incompleta.

  1. O Perfume ou o Ignorado na Cultura

    Directory of Open Access Journals (Sweden)

    Márcio Boaventura Jr.

    2011-05-01

    Full Text Available

    Resumo: A proposta do artigo é analisar o filme “Perfume, a história de um assassino” de Tom Tykwer sob o ponto de vista da psicanálise e da educação. Para tanto, buscamos debater o mal-estar na cultura, especialmente suas manifestações nas salas de aula, a partir dos diversos pontos do enredo em que podemos ilustrar o que Freud argumentou em sua tese sobre o tema.

     

    Resume: This article is intended to analyze Tom Tykwer's film Perfume: The Story of a Mur-derer (2006 under an educational and psychoanalytical perspective. Therefore we try to question cultural discontentment, mostly its manifestations in class, depicting the plot's many points of view to illustrate Freud thesis' arguing on the subject.

     

  2. A publicidade na perspectiva de Baudrillard

    Directory of Open Access Journals (Sweden)

    Maria Ogécia Drigo

    2009-09-01

    Full Text Available Resumo O propósito deste artigo é apresentar as idéias de Baudrillard sobre publicidade, tratadas na obra O sistema dos objetos. Assim, discutem-se os conceitos de arranjo e de ambiência que culminam no conceito de funcionalidade, os quais permitem apresentar as relações que se estabelecem entre os seres humanos, e entre eles e os objetos. Em seguida, aborda-se o papel da publicidade em meio a esses objetos/signos. Palavras-chave: Jean Baudrillard; comunicação; publicidade; funcionalidade; objetos/signos. Resumen El propósito de este artículo es presentar las ideas de Baudrillard sobre la publicidad, que constan en la obra El sistema de los objetos. Se discuten los conceptos de arreglo y de ambiencia que culminan en el concepto de funcionalidad, los cuales permiten presentar las relaciones que se establecen entre los seres humanos y entre ellos y los objetos. En seguida,se aborda el papel de la publicidad en medio de esos objetos/signos. Palabras-clave: Jean Baudrillard; comunicación; publicidad; funcionalidad; objetos/signos. Abstract This article intends to present Baudrillard’s ideas about advertising as considered in “Le système des objects”, his first book. The concepts of settlement, ambience and functionality are discussed. They make it possible to present the relations constructed among human beings and among humans and objects. We then discuss the role of advertising amongst these objects/signs. Keywords: Jean Baudrillard; communication; advertising; functionality; objects/signs.

  3. Polimorfismo na produção de medicamentos

    Directory of Open Access Journals (Sweden)

    Gabriel Lima Barros de Araujo

    2012-01-01

    Full Text Available O polimorfismo pode ocasionar desvios de qualidade durante o processo produtivo e influenciar o desempenho dos medicamentos. Por isso, o entendimento do fenômeno e suas implicações abre um campo amplo de possibilidades a serem exploradas na área farmacêutica, incluindo o surgimento de novos paradigmas e ferramentas na garantia da qualidade de medicamentos. Este trabalho apresenta uma introdução aos aspectos básicos do fenômeno do polimorfismo e suas implicações na produção e controle de medicamentos, com ênfase no polimorfismo dos fármacos.

  4. UTJECAJ MULTIMEDIJA POSREDSTVOM TEHNOLOGIJA VIRTUALNE REALNOSTI NA KOMUNIKACIJE

    OpenAIRE

    Grbavac, Jacinta; GRBAVAC, Vitomir

    2015-01-01

    U radu se opisuje utjecaj multimedije posredovane tehnologijom virtualne realnosti na komunikaciju i komuniciranje. Tehnologije virtualne realnosti označavaju skup tehnologija koja omogućuje razgovore između ljudi koji su fizički odvojeni tj. prostorno dislocirani. Cilj takve tehnologije je omogućiti razgovor između ljudi koji se nalaze na različitim zemljopisnim mjestima na svijetu, a povezani su poslovno, obiteljski ili prijateljskim odnosima i vezama. Zapravo, pod pojmom „tehnologije virtu...

  5. Greške na bešavnim cijevima

    OpenAIRE

    Devčić, N.; Mamuzić, I.; Terzić, K.

    2005-01-01

    U radu su sistematizirane greške na bešavnim cijevima slijedom faza tehnološkog procesa proizvodnje čeličnog uloška i bešavnih cijevi počev od klasično lijevanog uloška, (uzrokovao dominantno učešće grešaka) kontinuirano lijevanog uloška i suvremene proizvodnje čelika (zanemarivo uzrokuje greške na bešavnim cijevima). Posebno i detaljno su opisane glavne valjačke greške na cijevima u pilger valjaonici.

  6. VISOKOTLAČNA MIKRONIZACIJA SISTEMOV VIŠJE VISKOZNOSTI

    OpenAIRE

    Mandžuka, Zoran

    2010-01-01

    Namen raziskave je določiti vpliv obratovalnih parametrov PGSSTM mikronizacije na fizikalno-kemijske lastnosti praškastih delcev modelnih substanc estrov maščobnih kislin (monostearat in tristearat) in praškastih lakov. Uspešna izvedba PGSSTM mikronizacije temelji na poznavanju faznih ravnotežij. Določili smo potek talilnih krivulj (S — L faznih prehodov) v p,T diagramu za sistema monostearat/CO2 in tristearat/CO2. Pod tlakom CO2 se obema substancama zniža tališče oziroma ima S — L krivulj...

  7. Utjecaj ulaznog kuta trake na raspored naprezanja pri valjanju trake

    OpenAIRE

    Markowski, J

    2005-01-01

    U ovoj studiji je napravljena teorijska analiza valjanja kontinuirano lijevanog slaba na predstanu duo-stana valjaonice limova. Ta teorijska analiza je omogućila utvrđivanje učinka kuta ulaza trake na raspored naprezanja unutar otvora valjaka tijekom valjanja trake. Teorijska analiza procesa valjanja provedena je uporabom komercijalnog softvarskog paketa Forge 2 kojeg je razvila Ecole des Mines u Parizu. Taj paket radi na osnovi MKE (metode konačnih elemenata), te koristi ravni krutoplastični...

  8. The potential of the ground state of NaRb

    CERN Document Server

    Docenko, O; Ferber, R; Pashov, A; Knoeckel, H; Tiemann, E

    2003-01-01

    The X$^{1}\\Sigma ^{+}$ state of NaRb was studied by Fourier transform spectroscopy. An accurate potential energy curve was derived from more than 8800 transitions in isotopomers $^{23}$Na$^{85}$Rb and $^{23}$Na$^{87}$Rb. This potential reproduces the experimental observations within their uncertainties of 0.003 \\rcm to 0.007 \\rcm. The outer classical turning point of the last observed energy level ($v''=76$, $J''=27$) lies at $\\approx 12.4$ \\AA, leading to a energy of 4.5 \\rcm below the ground state asymptote.

  9. VREDNOTENJE KAKOVOSTI PEDAGOŠKEGA DELA NA GIMNAZIJAH

    OpenAIRE

    Gerdej, Tamara

    2011-01-01

    V diplomskem delu raziskujemo, kako dijaki vrednotijo kakovost pedagoškega dela. V Sloveniji namreč ni enotnih vprašalnikov, ki bi pokazali vrednotenje pedagoškega dela na gimnazijah. Raziskovali smo, kateri kazalniki vrednotenja kakovosti pedagoškega dela so za dijake bolj in kateri manj pomembni. Zanimalo nas je tudi, kako dijaki na različnih gimnazijah vrednotijo kakovost pedagoškega dela. Na osnovi rezultatov smo prišli do zaključkov, da je vrednotenje kakovosti pedagoškega dela, v večji ...

  10. VPLIV MEDIJSKEGA NASILJA NA VEDENJE V DRUŽBI

    OpenAIRE

    Gošnik, Barbara

    2012-01-01

    O medijskem nasilju in njegovem vplivu na ljudi je bilo rečeno že marsikaj. Vedno znova se odpira vprašanje, kaj so tisti vzroki, ki vplivajo na to, da človek stori nasilno dejanje ali celo umor. Skozi teoretični del predstavljamo več vrst teorij agresivnosti in teorij medijskega vpliva in jih povezujemo s konkretnimi primeri storjenih nasilnih dejanj in morebitnim vplivom medijev. Kakšno vlogo ima medijsko nasilje v primerjavi z ostalimi dejavniki in kako vplivajo mediji na vedenje ljudi – j...

  11. Utjecaj poliranja na električni potencijal amalgamskih ispuna

    OpenAIRE

    Galić, Nada; Prpić-Mehičić, Goranka; Anić, Ivica; Najžar-Fleger, Dora; Buntak-Kobler, Dunja

    1995-01-01

    Iako dentalni amalgam osim pozitivnih ima i negativna svojstva, ipak je najčešće rabljeni materijal za ispune stražnjih zuba. Jedno od negativnih svojstava jest i učinak na električna zbivanja u usnoj šupljini. U radu je, in vivo, ispitivan električni potencijal različitih vrsta amalgama neposredno nakon unošenja u kavitet, te sedam dana prije i poslije poliranja. Osim toga, ispitivan je učinak prisutnosti protetskih kovina na električni potencijal u usnoj šupljini. Razlika električnog potenc...

  12. Načela ratovanja: Aspekti preoblika i zastarijevanja

    OpenAIRE

    Paić, Ivo

    2000-01-01

    Problem ovoga istraživanja je neprevladano uvjerenje da unatoč promjenama zbilje rata i ratovanja vlada postojan odnos načela i te promjenjive zbilje. A vodeće je pitanje: je li to uvjerenje pokazatelj zastarijevanja mišljenja načela i neprimjerenosti tih konstrukcija zahtjevima promijenjene "slike rata", pa dijelovi njihova sadržaja pripadaju prošlosti. Izdvojene su dvije perspektive spoznavanja aspekata zastarijevanja. Jedna se otvara radikalnim prodorom vremena u načela: "natjecanje u vrem...

  13. Djelovanje miozmina na antioksidativne sustave u jetri štakora

    OpenAIRE

    Simeonova, Rumyana; Vitcheva, Vessela; Gorneva, Galina; Mitcheva, Mitka

    2012-01-01

    Miozmin (3-(1-pirolin-2-il)piridin) alkaloid je strukturno sličan nikotinu, za koji se zna da potiče oksidativni stres. Istražili smo djelovanje miozmina na enzimske i neenzimske antioksidativne sustave u jetri štakora. Wistar štakori primili su jednokratno pokusni spoj intraperitonealno u dozi od 19 mg kg-1, odnosno na usta u dozi od 190 mg kg-1. Za pozitivnu kontrolu rabili smo nikotin. Nakon primjene, bez obzira na put, zamijećena je promjena u jetrenoj funkciji u obliku pada razina glutat...

  14. ANALIZA UPORABNIŠKIH VMESNIKOV NA MOBILNIH NAPRAVAH

    OpenAIRE

    Bohak, Gregor

    2012-01-01

    V diplomskem delu smo predstavili pravila in smernice oblikovanja uporabniških vmesnikov na mobilnih napravah. Omejili smo se na platforme Google Android, Nokia Symbian, Nokia MeeGo, Apple iOS ter Microsoft Windows Phone 7. Za vsako izmed platform smo predstavili splošen model uporabniškega vmesnika, splošen model uporabniškega vmesnika aplikacije, navigacijske vzorce ter gradnike. Vse skupaj tudi smo obogatili z veliko grafičnega materiala. V drugem delu smo na podlagi pridobljenega znanja p...

  15. As terapias alternativas na assistência de enfermagem

    Directory of Open Access Journals (Sweden)

    Jackçon L. Savi

    1995-12-01

    Full Text Available Na seqüência do acompanhamento da disciplina "Métodos Terapêuticos Alternativos" (MTA. implantada no Curso de Graduação em Enfermagem da UFSC em 1990. focalizou-se os egressos com o objetivo de verificar a utilização das terapias alternativas na assistência de enfermagem que prestam como enfermeiros. Nenhum dos entrevistados posicionou-se contrário e a maioria confirmou utilizar uma ou mais terapias na assistência que prestam aos usuários dos serviços onde atuam.

  16. Ion Program of Na61/Shine at the CERN SPS

    CERN Document Server

    Gazdzicki, M

    2008-01-01

    The NA61/SHINE experiment at the CERN SPS aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. These goals will be reached by measurements of hadron production properties in nucleus-nucleus, proton-proton and proton-lead interactions as a function of collision energy and size of the colliding nuclei. Furthermore, NA61/SHINE will perform numerous precision measurements needed for neutrino (T2K) and cosmic-ray (Pierre Auger Observatory and KASCADE) experiments. This paper summarizes physics arguments for the NA61/SHINE ion program and presents the status and plans of the experiment.

  17. OBDAVČITEV STORITEV V SISTEMU DAVKA NA DODANO VREDNOST

    OpenAIRE

    Trninič, Milenko

    2010-01-01

    Davek na dodano vrednost se je začel razvijati leta 1967 in gre za posredni davek, kjer je obdavčen promet blaga in storitev v vseh fazah prometa, zato se imenuje tudi vsefazni neto davek. Zaradi harmonizacije DDV-ja so se sprejemale Direktive, med katerimi je najpomembnejša Direktiva 2006/112/ES o skupnem sistemu davka na dodano vrednost, ki ureja natančne opredelitve teritorialnega načela, davčne osnove, predmet obdavčevanja, kraj opravljenega prometa, nastanek davčne obveznosti in davč...

  18. DELO IN ZAPOSLOVANJE NA ČRNO V REPUBLIKI SLOVENIJI

    OpenAIRE

    Pilih, Alja

    2012-01-01

    V diplomskem delu je obravnavana problematika dela in zaposlovanja na črno.Delo in zaposlovanje na črno sta pojava, ki ju najdemo v vseh državah, v vseh gospodarstvih in v vseh političnih sistemih. Za delo na črno se šteje opravljanje kakršne koli dejavnosti, ki jo opravlja podjetje ali samostojni podjetnik in je nima vpisane v sodni register ali če nima z zakonom predpisanih listin o izpolnjevanju pogojev za opravljanje registrirane dejavnosti oziroma priglašene pri pristojnem organu, kot tu...

  19. Vpliv branik hrastovine na naravno odpornost proti glivam razkrojevalkam

    OpenAIRE

    Fabčič, Blaž

    2014-01-01

    Hrastovino uvrščamo med najbolj trajne slovenske lesne vrste. V literaturi in tudi na osnovi praktičnih izkušenj smo opazili, da naravna odpornost hrastovine močno niha. Do sedaj je večina strokovnjakov naravno odpornost hrastovine povezovala z vsebnostjo ekstraktivov. Dokazali so, da imajo ekstraktivi velik vpliv na naravno odpornost, vendar samo s tem parametrom niso mogli pojasniti razlik glede obnašanja vzorcev. Da bi ugotovili, kako na odpornost hrastovine vpliva širina branik oziroma go...

  20. VPLIV PREHRANE NA ZDRAVJE ŠOLSKIH OTROK

    OpenAIRE

    Lukman, Darja

    2009-01-01

    V diplomskem delu je poudarjena preventivna dejavnost z namenom, da opozorimo na potrebno vzgojo otrok, da bi lahko že zgodaj osvojili znanja o zdravem načinu življenja in tako živeli tudi v odrasli dobi. Osrednja tema so smernice zdravega prehranjevanja in vloga medicinske sestre pri promociji zdrave prehrane. Zaradi prezaposlenosti staršev so otroci mnogokrat prepuščeni samemu sebi in čas zapolnijo z gledanjem televizije in sedenjem pred računalnikom. Premalo se gibljejo na svežem zraku in...

  1. UTJECAJ LEPTINA NA HORMONALNU REGULACIJU REPRODUKTIVNOG SUSTAVA KRMAČA

    OpenAIRE

    Budimir, Kristina; Šperanda, Marcela

    2015-01-01

    Leptin je genetski produkt Lep gena, odnosno gena odgovornog za izazivanje pretilosti kod domaćih životinja. Leptin proizvode adipociti, a u organizmu djeluje kao adipostat. Signalizira o dostupnim količinama energije i na taj način utječe na rast, razvoj, razmnožavanje i metabolizam. Predstavlja metabolički signal izravno povezan s reproduktivnim sustavom. Starenjem životinja dolazi do povećavanja količine sintetiziranog leptina i pohranjenih triacilglicerola u masnome tkivu. To signalizira ...

  2. VPLIV POLIELEKTROLITOV NA VSEBNOST SUHE SNOVI V ODPADNEM AKTIVNEM BLATU

    OpenAIRE

    Zrilić, Nika

    2015-01-01

    Magistrsko delo obravnava problematiko s področja čiščenja odpadnih voda, pri katerih uporabljamo konvencionalni postopek čiščenja z aktivnim blatom. Zajema opis odpadne vode, virov in njenih lastnosti ter predstavlja postopek čiščenja z aktivnim blatom, proces flokulacije in uporabo različnih polielektrolitov pri procesu dehidracije blata. V preliminarnih poskusih, ki smo jih izvedli na ČN Ptuj, smo s spreminjanjem pretoka na centrifugi preverili, kako omenjena sprememba vpliva na vsebnost s...

  3. SISTEM ZA KARAKTERIZACIJO ORGANSKIH SOLARNIH CELIC NA OSNOVI FOTONAPETOSTNE SPEKTROSKOPIJE

    OpenAIRE

    Hribernik, Tomaž

    2013-01-01

    Magistrska naloga se osredotoča na korake za izboljšanje sistema za karakterizacijo organskih solarnih celic na osnovi fotonapetostne spektroskopije. Sistem je uporabljen za merjenje prehodov fotonapetosti. Podano je teoretično ozadje s temeljnimi koncepti in principi za boljše razumevanje načrtovanja in delovanja merilnega sistema. Podan je pregled in opis bistvenih elementov sistema. Del naloge je posvečen razlagi programskega dela za nadzor in analizo. Poleg tega je napravljen pregled in i...

  4. PROMOCIJA ZDRAVJA NA DELOVNEM MESTU V SUMMIT CENTRU

    OpenAIRE

    Knez, Tinka

    2016-01-01

    V tem diplomskem delu smo se odločili raziskati pomen promocije zdravja na delovnem mestu in pomen projekta Delajmo zdravo v Summit centru. V prvem delu naloge smo teoretično predstavili, kaj pravzaprav je promocija zdravja, kako se jo načrtuje in izvaja, kaj pomenijo varnost in zdravje pri delu ter zadovoljstvo zaposlenih na delovnem mestu. V drugem delu naloge smo predstavili podjetja Summit motors Ljubljana, d.o.o., Summit Leasing Slovenija d.o.o. in Summit avto, d.o.o., ki deluje...

  5. Fluorine-18 NaF PET imaging of child abuse

    International Nuclear Information System (INIS)

    We describe the use of 18F-NaF positron emission tomography (PET) whole-body imaging for the evaluation of skeletal trauma in a case of suspected child abuse. To our knowledge, 18F NaF PET has not been used in the past for the evaluation of child abuse. In our patient, this technique detected all sites of trauma shown by initial and follow-up skeletal surveys, including bilateral metaphyseal fractures of the proximal humeri. Fluorine-18 NaF PET has potential advantage over Tc-99m-labeled methylene diphosphonate (MDP) based upon superior image contrast and spatial resolution. (orig.)

  6. Fluorine-18 NaF PET imaging of child abuse

    Energy Technology Data Exchange (ETDEWEB)

    Drubach, Laura A. [Children' s Hospital Boston and Harvard Medical School, Department of Radiology, Division of Nuclear Medicine/PET, Boston, MA (United States); Sapp, Mark.V. [School of Osteopathic Medicine, Child Abuse Research Education and Services (CARES) Institute University of Medicine and Dentistry of New Jersey, New Jersey (United States); Laffin, Stephen [Children' s Hospital Boston, Department of Radiology, Division of Nuclear Medicine/PET, Boston, MA (United States); Kleinman, Paul K. [Children' s Hospital Boston and Harvard Medical School, Department of Radiology, Division of Musculoskeletal Imaging, Boston, MA (United States)

    2008-07-15

    We describe the use of {sup 18}F-NaF positron emission tomography (PET) whole-body imaging for the evaluation of skeletal trauma in a case of suspected child abuse. To our knowledge, 18F NaF PET has not been used in the past for the evaluation of child abuse. In our patient, this technique detected all sites of trauma shown by initial and follow-up skeletal surveys, including bilateral metaphyseal fractures of the proximal humeri. Fluorine-18 NaF PET has potential advantage over Tc-99m-labeled methylene diphosphonate (MDP) based upon superior image contrast and spatial resolution. (orig.)

  7. Utjecaj noradrenalina i adrenalina na djelovanje lidokaina tijekom lokalne anestezije

    OpenAIRE

    Simonić, Ante; Atanacković, Dimitrije; Brkić, Neda

    1986-01-01

    Proučavan je intenzitet lokalno-anestetskog učinka, utjecaj na sistematski krvni tlak, učestalost kucanja srca, te nastajanje neželjenih subjektivnih i objektivnih smetnji u bolesnika kojima je u lokalnoj anesteziji izvađen zub. Uspoređivali smo djelovanje lidokaina, te lidokaina datog sa adrenalinom ili sa noradrenalinom. Adrenalin i noradrenalin povećavaju analgetsko djelovanje lidokaina, ne utječu značajno na puls, niti na visinu sistemskog krvnog tlaka, ali mogu uzrokovati nemir, glav...

  8. ANALIZA ZADOVOLJSTVA PROSTOVOLJNIH KRVODAJALCEV NA PODROČJU SEVEROVZHODNE SLOVENIJE

    OpenAIRE

    Jemenšek, Janja

    2016-01-01

    Krvodajalstvo predstavlja množično udejstvovanje prostovoljnih ljudi krvodajalcev, ki nesebično sodelujejo na krvodajalskih akcijah in na takšen način pomagajo bolnikom pri ohranitvi življenja. V magistrskem delu smo preučevali profil, motive in zadovoljstvo krvodajalcev, ki prostovoljno darujejo kri. V raziskavo so zajeti krvodajalci, ki darujejo kri v Centru za transfuzijsko medicino (CTM) Univerzitetnega kliničnega centra Maribor (UKC MB), terenskih akcijah CTM ter dislociranih enotah CTM ...

  9. FATORES DE RISCO NA REPETIÇÃO DE GRAVIDEZ NA ADOLESCÊNCIA

    Directory of Open Access Journals (Sweden)

    Eulália Maria Chaves-Maia

    2009-01-01

    Full Text Available A fim de traçar o perfil biopsicossocial de adolescentes com repetição de gravidez e seus fatores associados, investigou-se questões socio-demográficas, variáveis biológicas e psicológicas de 50 adolescentes multigestas.Os dados analisados através de estatística descritiva apontam que a maioria das adolescentes não frequentava a escola e vivia em união estável, que 54% não fez uso de métodos contraceptivos na primeira relação sexual e 88% nunca participou dos programas de Planejamento Familiar. Assim, políticas públicas de educação sexual e reprodutiva devem identificar comportamentos sexuais de risco, atuar na construção de valores familiares e no planejamento das gestações.

  10. Robust NaO2 Electrochemistry in Aprotic Na-O2 Batteries Employing Ethereal Electrolytes with a Protic Additive.

    Science.gov (United States)

    Abate, Iwnetim I; Thompson, Leslie E; Kim, Ho-Cheol; Aetukuri, Nagaphani B

    2016-06-16

    Aprotic metal-oxygen batteries, such as Li-O2 and Na-O2 batteries, are of topical research interest as high specific energy alternatives to state-of-the-art Li-ion batteries. In particular, Na-O2 batteries with NaO2 as the discharge product offer higher practical specific energy with better rechargeability and round-trip energy efficiency when compared to Li-O2 batteries. In this work, we show that the electrochemical deposition and dissolution of NaO2 in Na-O2 batteries is unperturbed by trace water impurities in Na-O2 battery electrolytes, which is desirable for practical battery applications. We find no evidence for the formation of other discharge products such as Na2O2·H2O. Furthermore, the electrochemical efficiency during charge remains near ideal in the presence of trace water in electrolytes. Although sodium anodes react with trace water leading to the formation of a high-impedance solid electrolyte interphase, the increase in discharge overpotential is only ∼100 mV when compared to cells employing nominally anhydrous electrolytes. PMID:27214400

  11. Determinants of substrate and cation transport in the human Na+/dicarboxylate cotransporter NaDC3.

    Science.gov (United States)

    Schlessinger, Avner; Sun, Nina N; Colas, Claire; Pajor, Ana M

    2014-06-13

    Metabolic intermediates, such as succinate and citrate, regulate important processes ranging from energy metabolism to fatty acid synthesis. Cytosolic concentrations of these metabolites are controlled, in part, by members of the SLC13 gene family. The molecular mechanism underlying Na(+)-coupled di- and tricarboxylate transport by this family is understood poorly. The human Na(+)/dicarboxylate cotransporter NaDC3 (SLC13A3) is found in various tissues, including the kidney, liver, and brain. In addition to citric acid cycle intermediates such as α-ketoglutarate and succinate, NaDC3 transports other compounds into cells, including N-acetyl aspartate, mercaptosuccinate, and glutathione, in keeping with its dual roles in cell nutrition and detoxification. In this study, we construct a homology structural model of NaDC3 on the basis of the structure of the Vibrio cholerae homolog vcINDY. Our computations are followed by experimental testing of the predicted NaDC3 structure and mode of interaction with various substrates. The results of this study show that the substrate and cation binding domains of NaDC3 are composed of residues in the opposing hairpin loops and unwound portions of adjacent helices. Furthermore, these results provide a possible explanation for the differential substrate specificity among dicarboxylate transporters that underpin their diverse biological roles in metabolism and detoxification. The structural model of NaDC3 provides a framework for understanding substrate selectivity and the Na(+)-coupled anion transport mechanism by the human SLC13 family and other key solute carrier transporters.

  12. Characterization and antibacterial activity of silver exchanged regenerated NaY zeolite from surfactant-modified NaY zeolite.

    Science.gov (United States)

    Salim, Mashitah Mad; Malek, Nik Ahmad Nizam Nik

    2016-02-01

    The antibacterial activity of regenerated NaY zeolite (thermal treatment from cetyltrimethyl ammonium bromide (CTAB)-modified NaY zeolite and pretreatment with Na ions) loaded with silver ions were examined using the broth dilution minimum inhibitory concentration (MIC) method against Escherichia coli (E. coli ATCC 11229) and Staphylococcus aureus (S. aureus ATCC 6538). X-ray diffraction (XRD), attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and chemical elemental analyses were used to characterize the regenerated NaY and AgY zeolites. The XRD patterns indicated that the calcination and addition of silver ions on regenerated NaY zeolite did not affect the structure of the regenerated NaY zeolite as the characteristic peaks of the NaY zeolite were retained, and no new peaks were observed. The regenerated AgY zeolite showed good antibacterial activity against both bacteria strains in distilled water, and the antibacterial activity of the samples increased with increasing Ag loaded on the regenerated AgY zeolite; the regenerated AgY zeolite was more effective against E. coli than S. aureus. However, the antibacterial activity of the regenerated AgY was not effective in saline solution for both bacteria. The study showed that CTAB-modified NaY zeolite materials could be regenerated to NaY zeolite using thermal treatment (550°C, 5h) and this material has excellent performance as an antibacterial agent after silver ions loading.

  13. On the structure and chemical bonding of Si62- and Si62- in NaSi6- upon Na+ coordination

    Science.gov (United States)

    Zubarev, Dmitry Yu.; Alexandrova, Anastassia N.; Boldyrev, Alexander I.; Cui, Li-Feng; Li, Xi; Wang, Lai-Sheng

    2006-03-01

    Photoelectron spectroscopy was combined with ab initio calculations to elucidate the structure and bonding in Si62- and NaSi6-. Well-resolved electronic transitions were observed in the photoelectron spectra of Si6- and NaSi6- at three photon energies (355, 266, and 193nm). The spectra of NaSi6- were observed to be similar to those of Si6- except that the electron binding energies of the former are lower, suggesting that the Si6 motif in NaSi6- is structurally and electronically similar to that in Si6-. The electron affinities of Si6 and NaSi6 were measured fairly accurately to be 2.23±0.03eV and 1.80±0.05eV, respectively. Global minimum structure searches for Si62- and NaSi6- were performed using gradient embedded genetic algorithm followed by B3LYP, MP2, and CCSD(T) calculations. Vertical electron detachment energies were calculated for the lowest Si6- and NaSi6- structures at the CCSD(T)/6-311+G(2df ), ROVGF/6-311+G(2df), UOVGF/6-311+G(2d), and time-dependent B3LYP/6-311+G(2df) levels of theory. Experimental vertical detachment energies were used to verify the global minimum structure for NaSi6-. Though the octahedral Si62-, analogous to the closo form of borane B6H62-, is the most stable form for the bare hexasilicon dianion, it is not the kernel for the NaSi6- global minimum. The most stable isomer of NaSi6- is based on a Si62- motif, which is distorted into C2v symmetry similar to the ground state structure of Si6-. The octahedral Si62- coordinated by a Na+ is a low-lying isomer and was also observed experimentally. The chemical bonding in Si62- and NaSi6- was understood using natural bond orbital, molecular orbital, and electron localization function analyses.

  14. BLOKADA SPLETNIH STRANI IN KRŠENJE PRAVICE DO ZASEBNOSTI PRI NADZORU IGER NA SREČO NA INTERNETU

    OpenAIRE

    Dreo, Andreja

    2015-01-01

    Diplomsko delo obravnava dopustnost blokad spletnih strani ponudnikov internetnih iger na srečo s strani državnih organov v RS in znotraj EU, varstvo osebnih podatkov in varstvo zasebnosti pri uporabnikih spletnih iger na srečo in potrditev omejenega delovanja iger na srečo z odločbami Sodišča EU. Razmah interneta in njegova uporaba pri posameznikih sta omogočila obiskovanje igralnice kar od doma, kar je marsikaterega potencialnega igralca spremenilo v realnega in s tem razširilo trg igralniš...

  15. Utjecaj NaCl na fermentaciju zrelih zelenih rajčica cv. Ailsa Braig u rasolu

    OpenAIRE

    Fragkostefanakis, Sotirios; Kalaitzis, Panagiotis; Gerasopoulos, Dimitrios; Siomos, Anastasios S.

    2010-01-01

    U radu je ispitan utjecaj osmoze na ekspresiju gena i aktivnost glavnih enzima koji sudjeluju u fermentaciji zrelih zelenih rajčica (Solanum lycopersicum cv. Ailsa Craig), i to uranjanjem plodova u vodu i rasol što sadržava 5 ili 10 % NaCl. Površina je plodova prije obrade sterilizirana da bi se spriječio rast mikroorganizama na pokožici ploda. Analizirani su plodovi rajčice i rasol tijekom 0,5; 1; 1,5; 2; 3; 7 i 14 dana skladištenja, te ispitani ovi parametri: promjena ekspresije gena i akti...

  16. UTJECAJ ODRŽIVIH HOTELA NA OKOLIŠ I EKONOMIJU

    OpenAIRE

    Peršić-Živadinov, Irena

    2009-01-01

    Tema članka je održivi razvitak u turizmu i hotelijerstvu, s posebnim naglaskom na ulogu koju treba posvetiti održivoj gradnji hotela, a radi smanjenja negativnog utjecaja na okoliš. Hoteli dizajnirani i građeni prema načelima održivog razovja, su tijekom poslovanja mnogo efikasniji u korištenju zemljišta, energije, vode i materijala za održavane u odnosu na hotele građene klasičnim pristupom. To potvrđuje i većina velikih hotelskih lanaca (poput Hilton-a i Marriott-a), koji prakticiraju prim...

  17. An improved gammaspectrometric method for trace analysis of 22Na

    International Nuclear Information System (INIS)

    22Na+ is applicable as a tracer for salt-containing injection water in secondary oil recovery. The present article presents results from comparative investigations of the detection limit of 22Na in brine. 3 in.x3 in. and 5 in.x5 in. NaI(Tl) planar detectors have been used in combination with cylindrical and Marinelli-shaped samples. In order to take advantage of the emitted coincident electromagnetic radiation, a large annular NaI(Tl) crystal has been used as a sum spectrometer. Examples of results for a counting time of 3 h are the following: counting of a 2000 ml Marinelli sample on a 5 in.x5 in. detector yields LD=1.51x10-4 Bq/ml; counting with the sum spectrometer on a salt disc prepared from 2000 ml sampled brine yields LD-5 Bq/ml. (orig.)

  18. Two Na+ and Cl- Hyperaccumulators of the Chenopodiaceae

    Institute of Scientific and Technical Information of China (English)

    Ke-Fu ZHAO; Hai FAN; Jie SONG; Ming-Xia SUN; Bao-Zeng WANG; Sheng-Qiang ZHANG; I. A. UNGAR

    2005-01-01

    The authors found five sodium (Na+) and chloride (Cl-) hyperaccumulating halophytes in the Temperate Desert of Xinjiang, China and studied two of them (Suaeda salsa (L.) Pall. and Kalidium folium (Pall.) Moq.). K. folium and S. salsa had a NaCl content of 32.1% and 29.8%, respectively, on a dry weight basis. X-ray microanalysis of the Na+ in the vacuole, apoplasts and cytoplasm of the two plants indicated a ratio of 7.3:5.6:1.0 in K. folium and 7.3:6.6:1.0 in S. salsa. These data show that K. folium and S. salsa both have a high Na+ and Cl-accumulating capacity, which is related to high activity oftonoplast H+-ATPase and H+-PPase.

  19. O, Na, Ba and Eu abundance patterns in open clusters

    CERN Document Server

    MacLean, B T; Lattanzio, J

    2014-01-01

    Open clusters are historically regarded as single-aged stellar populations representative of star formation within the Galactic disk. Recent literature has questioned this view, based on discrepant Na abundances relative to the field, and concerns about the longevity of bound clusters contributing to a selection bias: perhaps long-lived open clusters are chemically different to the star formation events that contributed to the Galactic disk. We explore a large sample of high resolution Na, O, Ba & Eu abundances from the literature, homogenized as much as reasonable including accounting for NLTE effects, variations in analysis and choice of spectral lines. Compared to a template globular cluster and representative field stars, we find no significant abundance trends, confirming that the process producing the Na-O anti-correlation in globular clusters is not present in open clusters. Furthermore, previously reported Na-enhancement of open clusters is found to be an artefact of NLTE effects, with the open cl...

  20. Initial atmospheric corrosion of Zinc sprayed with NaCl

    Institute of Scientific and Technical Information of China (English)

    屈庆; 严川伟; 张蕾; 刘光恒; 曹楚南

    2003-01-01

    Regularities of the initial atmospheric corrosion of zinc sprayed with different amount of NaCl exposed to air at 80% relative humidity and 25 ℃ were investigated via quartz crystal microbalance in laboratory. The results show that NaCl can accelerate the corrosion of zinc. Mass gain of zinc increases with the exposure time increasing, which can be correlated by using exponential decay function. The relationship between mass gain and amount of NaCl sprayed at a certain exposure time follows a quadratic function. Meanwhile, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and electron dispersion X-ray analysis were used to characterize the corrosion surface and products. Zn5(OH)8Cl2*H2O and ZnO are the dominant corrosion products, which unevenly distribute on the surface of zinc in the presence of NaCl. A probable mechanism is simply presented to explain the experimental results.