WorldWideScience

Sample records for surfactante natural para

  1. Surfacen: Un surfactante natural para el tratamiento del síndrome del distress respiratorio neonatal

    Directory of Open Access Journals (Sweden)

    Dahís Manzanares

    1997-04-01

    redujeron notablemente en 24 horas. Las complicaciones más frecuentes fueron 56,5 %, hemorragia intraventricular (III-IV 26,1 % y displasia broncopulmonar 17,4 %; no hubo neumotórax. La mortalidad en el primer mes fue de 30,4 %. Surfacen es un producto biológico efectivo para el tratamiento del SDR de neonatos, y una reducción mayor de las complicaciones y la mortalidad puede ser lograda con un buen manejo integral de estos neonatos.Surfacen is an organic extract obtained from the pulmonary lavage of pigs. It contains approximately 93 % of phospholipids and 1 % of proteins with a low molecular weight. The preparation has an average of 69 % of phospholydylcholine and less than 1 % of lysophosphatidylcholine in some batches. The surface tension was evaluated by the bubble's maximum pressure method, and in some trials the equilibrium surface tension varies from 25 to 30 nM/m. Each batch of Surfacen was also evaluated through experiments with rabbit fetuses aged 27 days that underwent static curves of pressure and volume, with doses of phospholipids between 45 and 80 mg/kg, with an opening pressure from 15 to 20 cm of H2O, and a maximum expansion volume of 39 mL/kg. A significant improvement of the pulmonary function has been observed in inmature newborn lambs (135 to 140 days of pregnancy. In 7 animals the product was administered 100 mg/kg and PO2 increased up to 40 kPa; whereas the inspired oxygen fraction could be reduced from 0,7 to 0,2 in 4,5 hours. Later on, Surfacen was used in 23 preterm human neonates (average weight of 1 368 g and 30.5 weeks of gestational age, with clinical and radiological evidence of severe respiratory distress syndrome. These neonates had an inspired oxygen fraction 0.6, an average pressure of airways 8 cm H2O, and PaO2/FiO2 < 20 kPa. In 16 neonates it was used a dosage of 100 mg/kg; in 6, 2; and in 1, 3. The results were as follows: the arterial pressure of oxygen increased significantly more than 9,3 kPa one hour after the administration of

  2. Ecotoxicity of glyphosate and aterbane® br surfactant on guaru (Phalloceros caudimaculatus = Ecotoxicologia do glifosato e surfactante aterbane® br para guaru (Phalloceros caudimaculatus

    Directory of Open Access Journals (Sweden)

    Natália Sayuri Shiogiri

    2010-07-01

    Full Text Available Aquatic macrophytes are important components of aquatic ecosystems, but these plants have become a problem due to their occurrence in different regions. Some studies aimed to demonstrate the effectiveness of herbicides to control these macrophytes; however, fewstudies report the possible ecotoxicological effects. The objective of this study was to estimate the acute toxicity (LC (I50;96h and assess water quality variables for glyphosate in the Rodeo® formulation, Aterbane® BR surfactant and mixtures of glyphosate + 0.5% and 1.0% of surfactant, for the guaru fish (Phallocerus caudimaculatus. The guaru was exposed to increasing concentrationsof glyphosate and a mixture of glyphosate + 0.5 and 1.0% of surfactant. The mixture of glyphosate and glyphosate + 0.5 and 1.0% of surfactant showed (LC (I50;96h > 975.0 mg L-1. For the surfactant, the rate was 5.81 mg L-1. The glyphosate and mixtures of glyphosate + 0.5% and 1.0% of surfactant caused a decrease in pH and dissolved oxygen and increased the electrical conductivity of water. Glyphosate in the Rodeo® formulation and the mixtures with surfactantAterbane® BR can be classified as practically nontoxic, whereas surfactant Aterbane® BR can be considered as moderately toxic to guaru.As macrófitas aquáticas são importantes componentes dos ecossistemas, porém elas têm se tornado um problema pela sua ocorrência em diversas regiões. Alguns estudos visam comprovar a eficácia dos herbicidas no controle dessas macrófitas, porém, poucos trabalhos relatam os possíveis efeitos ecotoxicológicos. Assim, o objetivo deste trabalho foi estimar a toxicidade aguda (LC (I50;96h e avaliar as variáveis de qualidade de água para o glifosato na formulação Rodeo®, o surfactante Aterbane® BR e das misturas de glifosato + 0,5 e 1,0% do surfactante, para o peixe guaru (Phallocerus caudimaculatus. Para tanto, o guaru foi exposto a concentrações de glifosato e da mistura do glifosato + 0,5 e 1,0% do

  3. Efeitos tóxicos de surfactantes fitossanitários para o peixe mato grosso (Hyphessobrycon eques =Toxic effects of phytosanitary surfactants for jewel tetra (Hyphessobrycon eques

    Directory of Open Access Journals (Sweden)

    Silvia Patrícia Carraschi

    2011-04-01

    Full Text Available Os surfactantes são moléculas anfipáticas que reduzem a tensão superficial da água e fazem parte dos componentes inertes das formulações de produtos fitossanitários. Assim, os objetivos deste trabalho foram: estimar a concentração letal (CL(I(50;96h; classificar e avaliar a qualidade da água durante os testes de toxicidade aguda dos surfactantes: Agral®, Aterbane® BR, Ag-Bem®, Energic®, Fixade® e Gotafix® para o peixe mato grosso (Hyphessobrycon eques; e os sinais de intoxicação nos animais. Para tanto, os peixes foram aclimatados por dez dias em sala de bioensaio. Os animais foram expostos aos surfactantes em DIC com três repetições. A CL(I(50;96h do surfactante Agral® foi 3,29 mg L-1; do Aterbane® BR, 8,21 mg L-1; do Energic®, 2,34 mg L-1; do Gotafix®, 4,37 mg L-1; do Fixade®, 3,38 mg L-1 e do Ag-Bem®, 34,95 mg L-1. As variáveis de qualidade da água não foram alteradas. Os peixes apresentaram aumento do batimento opercular após a exposição; 4 e 24h, perda da capacidade de arfagem; 48h, batimento opercular lento e 72 e 96h, recuperação. Os surfactantes Energic®, Agral®, Gotafix®, Aterbane® BR e Fixade® podem ser classificados como moderadamente tóxicos e o Ag-Bem® como pouco tóxico para H. eques e este organismo apresenta sinais de intoxicação semelhantes para todos os surfactantes.Surfactants are amphipatic molecules that reduce the surface tension of water and make up the inert components of pesticide formulations. Thus, the objectives of this study were: to estimate the lethal concentration (LC(I50;96h; classify and evaluate water quality during testing of the following surfactants: Agral®, Aterbane®BR,Ag-bem®, Energic®, Fixade® and Gotafix® for jewel tetra (Hyphessobrycon eques; and the signs of intoxication in the animals. For this, the fish were acclimated for ten days in the bioassay room. The animals were exposed to the surfactants in an entirely randomizeddesign with three

  4. Evaluación de una Técnica de Nebulización para la Administración de Surfactante en la Población Neonatal. Establecimiento de las Pautas para el Diseño de un Nuevo Dispositivo.

    OpenAIRE

    Goikoetxea Miranda, E. (Estibalitz); Murgia Esteve, X.(Xabier); Antón-Remírez, R. (Raúl); Rivas-Nieto, A. (Alejandro)

    2016-01-01

    El tratamiento que se utiliza en la actualidad para curar el Síndrome de Distrés Respiratorio (SDR) que se da en bebés prematuros conlleva riesgos que pueden causar daños permanentes en el bebé. Este tratamiento consiste en intubar al neonato para someterlo a ventilación mecánica y en administrarle surfactante pulmonar mediante instilación intratraqueal. Para evitar los riesgos de este tratamiento se están investigando métodos alternativos más seguros. En esta línea, una posible alternativa q...

  5. Efeitos tóxicos de surfactantes fitossanitários para o peixe mato grosso (Hyphessobrycon eques - doi: 10.4025/actascibiolsci.v33i2.6252 Toxic effects of phytosanitary surfactants for jewel tetra (Hyphessobrycon eques - doi: 10.4025/actascibiolsci.v33i2.6252

    Directory of Open Access Journals (Sweden)

    Robinson Antonio Pitelli

    2011-05-01

    Full Text Available Os surfactantes são moléculas anfipáticas que reduzem a tensão superficial da água e fazem parte dos componentes inertes das formulações de produtos fitossanitários. Assim, os objetivos deste trabalho foram: estimar a concentração letal (CL(I(50;96h; classificar e avaliar a qualidade da água durante os testes de toxicidade aguda dos surfactantes: Agral®, Aterbane® BR, Ag-Bem®, Energic®, Fixade® e Gotafix® para o peixe mato grosso (Hyphessobrycon eques; e os sinais de intoxicação nos animais. Para tanto, os peixes foram aclimatados por dez dias em sala de bioensaio. Os animais foram expostos aos surfactantes em DIC com três repetições. A CL(I(50;96h do surfactante Agral® foi 3,29 mg L-1; do Aterbane® BR, 8,21 mg L-1; do Energic®, 2,34 mg L-1; do Gotafix®, 4,37 mg L-1; do Fixade®, 3,38 mg L-1 e do Ag-Bem®, 34,95 mg L-1. As variáveis de qualidade da água não foram alteradas. Os peixes apresentaram aumento do batimento opercular após a exposição; 4 e 24h, perda da capacidade de arfagem; 48h, batimento opercular lento e 72 e 96h, recuperação. Os surfactantes Energic®, Agral®, Gotafix®, Aterbane® BR e Fixade® podem ser classificados como moderadamente tóxicos e o Ag-Bem® como pouco tóxico para H.eques e este organismo apresenta sinais de intoxicação semelhantes para todos os surfactantes.Surfactants are amphipatic molecules that reduce the surface tension of water and make up the inert components of pesticide formulations. Thus, the objectives of this study were: to estimate the lethal concentration (LC(I50;96h; classify and evaluate water quality during testing of the following surfactants: Agral®, Aterbane®BR, Ag-bem®, Energic®, Fixade® and Gotafix® for jewel tetra (Hyphessobrycon eques; and the signs of intoxication in the animals. For this, the fish were acclimated for ten days in the bioassay room. The animals were exposed to the surfactants in an entirely randomized design with three

  6. Selection of surfactants for using in invert emulsion based on vegetable oil; Selecao de surfactantes para uso em emulsoes inversas a base de oleo vegetal

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Giliane V.; Lacerda, Vanessa M.; Garcia, Rosangela B.; Costa, Marta [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Lab. de Pesquisa em Petroleo (LAPET); Girao, Joaquim Helder S. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The purpose of this study was to investigate the superficial properties of a vegetable oil of degree nutritious front the several biodegradable surfactants, seeking to stabilize emulsions of the type water-in-oil, presents in formulations of fluids of perforation of oleofilic base. Mentioned them fluids they are suitable to the perforation of located oil wells in leases of high environmental sensibility and with inferior temperature to 250 deg F. The use of a fluid of that nature can make possible the discard of the solids perforated directly in the sea, sparing the application of previous treatments, or the transport of the same ones for dike-mother, operations that you/they can elevate the total cost of the perforation. The values of the superficial tension and of the concentration critical micellar, they were measured in the solutions oil vegetal/tensoactive, through the method of the ring (DuNouy), using a tensiometer DCA 315 (Thermo Cahn). The effects of the variation of the concentration and of the temperature in the superficial properties of the oil were certain. (author)

  7. Simultaneous injection of polymer and surfactant for improving oil recovery; Injecao simultanea de polimero e surfactante para aumento da recuperacao de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Ana C.R.; Valentim, Adriano C.M.; Marcelino, Cleuton P.; Fagundes, Fabio P.; Girao, Joaquim H.S.; Garcia, Rosangela B. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Lab. de Pesquisa em Petroleo (LAPET)

    2004-07-01

    The injection of polymeric solutions in petroleum reservoirs is a supplemental method of petroleum recovery, that seeks to increase the volumetric efficiency of swept of the oil with the decrease of the mobility of the injection water. In the contact between two non miscible fluids, superficial tensions are established, that can influence the relations between the rock and the fluids, depending on the nature of both. Therefore, the combined injection of a surfactant and a polymer can promote improvements in the injectivity and in the global recovery efficiency. In this work it was used samples of commercial polyacrylamide, which were characterized through hydrolysis degree, molecular weight and rheological behavior. From these results it was chosen one sample to be used associated to a polymeric surfactant. Through a core flood system, the following tests were done: injection of polymer solution; injection of surfactant solution followed by polymer solution and injection of surfactant / polymer mixture. The results showed that the injection of surfactant / polymer mixture promoted a significant increase in the residual resistance factor, in relation to the other situations. (author)

  8. BIORREMEDIAÇÃO IN SITU COM PERÓXIDOS SÓLIDOS E SURFACTANTE DE SOLOS CONTAMINADOS

    Directory of Open Access Journals (Sweden)

    Tiago Bender Wermuth

    2011-08-01

    Full Text Available O presente trabalho objetiva avaliar o uso de peróxidos sólidos com a adição de sais de fosfato, nitrogênio e surfactante na biorremediação de solos contaminados por derivados de petróleo. Para isso, coletou-se uma amostra do solo contaminado durante os trabalhos de recuperação de uma área de um posto de gasolina. A mesma foi colocada em uma caixa de PVC, dividida em duas partes. Uma parte foi tratada por meio da adição de peróxido de cálcio, surfactante e superfosfato (fonte de nutrientes. Já a outra recebeu a aplicação de somente peróxido de cálcio e superfosfato. Os resultados do tratamento deste solo foram monitorados semanalmente por meio de medidas da umidade, pH e temperatura. A descontaminação do solo foi acompanhada pela análise dos compostos Benzeno, Tolueno, Etilbenzeno, Xileno, TPH-GRO (Gasoline Range Organics, TPH-ORO (Oil Range Organics e TPH-DRO (Diesel Range Organics, segundo as normas USEPA 8015D, USEPA 5021A, USEPA 8021B. Os valores mostram que o solo tratado com peróxido de cálcio, surfactante e superfosfato tiveram resultados semelhantes ao lado em que não continha o surfactante.

  9. PROPIEDADES INTERFACIALES DEL SURFACTANTE PDMS-PEGANHÍDRIDO MALÉICO-ÁCIDO FUMÁRICO (PDMS-PEG-AM-AF) EN SOLUCIÓN ACUOSA

    OpenAIRE

    Johana Rodríguez; Edgardo Meza Fuentes; Maria Cecilia Azevedo Espiridiao

    2011-01-01

    En este estudio se determinaron las propiedadesinterfaciales en solución acuosadel surfactante del tipo PDMS-éster quecontiene polidimetilsiloxano (PDMS),polietilenglicol (PEG), anhídrido maléicoy ácido fumárico. Para el estudio delas propiedades interfaciales se emplearonlas técnicas tensiometría y espectroscopiaen la región del UV-Vis. En soluciónacuosa este surfactante mostró uncomportamiento complejo, que es dependientede la concentración. En este surfactantese observó un cambio brusco en...

  10. Terapia com surfactante pulmonar exógeno em pediatria Exogenous surfactant therapy in pediatrics

    Directory of Open Access Journals (Sweden)

    Norberto A. Freddi

    2003-11-01

    Full Text Available OBJETIVO: Revisar o estágio atual do conhecimento sobre a utilização do surfactante exógeno nas diferentes doenças pulmonares que levam à insuficiência respiratória aguda em crianças. FONTES DOS DADOS: Este manuscrito baseia-se na experiência clínica dos autores sobre o assunto e na revisão da literatura recente através de consulta aos bancos de dados ONIA, Mdconsult, Medline e Cochrane Database Library. SÍNTESE DOS DADOS: Apesar do sucesso obtido com a utilização do surfactante exógeno na síndrome de desconforto respiratório do recém-nascido, questões permanecem indefinidas, como o momento do seu emprego, muito precoce (profilático, baseado na idade gestacional ou em testes rápidos de maturidade pulmonar, ou então mais tardiamente, após o quadro clínico instalado. Em outras patologias graves que levam à insuficiência respiratória grave com necessidade de suporte ventilatório, o seu uso ainda é controverso, e os dados da literatura são limitados e conflitantes. Porém, relatos de uso clínico em várias destas situações, com sucesso, têm sido freqüentes. A pesquisa em surfactante tem-se centrado ultimamente na sua inativação por várias substâncias que podem estar presentes na via aérea. Nas patologias em que a inativação parece ser um fator importante, novos surfactantes com adição de adjuvantes para reverter a tendência à inativação (por exemplo: polietilenoglicol estão atualmente em fase de testes. CONCLUSÕES: A terapia com surfactante exógeno ainda não é um tema esgotado, nem mesmo na SDR. Os surfactantes podem ser ainda aperfeiçoados, sobretudo para resistir à inibição, e as formas de utilização em outras doenças que não a SDR deverão ser aperfeiçoadas.OBJECTIVE: To review current knowledge about the use of exogenous surfactants in the treatment of different lung diseases causing acute respiratory failure in children. SOURCE OF DATA: This review is based on the authors

  11. Síntese e caracterização de zeólita de cinzas de carvão modificada por surfactante catiônico Synthesis and characterization of zeolite from coal ashes modified by cationic surfactant

    Directory of Open Access Journals (Sweden)

    D. A. Fungaro

    2012-03-01

    Full Text Available Zeólita sintetizada a partir de cinzas leve de carvão foi modificada com diferentes concentrações (2 e 20 mmol.L-1 de brometo de hexadeciltrimetilamônio (HDTMA-Br. A zeólita não modificada (ZNM e as zeólitas modificadas por surfactante (ZMS foram caracterizadas por fluorescência de raios X, difração de raios X, espectroscopia no infravermelho com transformada de Fourier (FTIV, microscopia eletrônica de varredura, análise termogravimétrica, entre outros. As ZMS apresentaram carga negativa provavelmente devido à formação de bicamada parcial de HDTMA sobre os sítios ativos trocáveis na superfície externa da ZNM. Um decréscimo da área superficial foi observado para ZMS quando comparada com ZNM, indicando cobertura da superfície da zeólita com moléculas do HDTMA-Br. A natureza cristalina da zeólita permaneceu intacta após a adsorção do surfactante e o aquecimento para secagem. A análise de FTIV indicou que não houve mudanças significativas na estrutura da zeólita após a adsorção do surfactante.Zeolite synthesized from coal fly ash was modified with different concentrations (2 and 20 mmol.L-1 of hexadecyltrimethylammonium bromide (HDTMA-Br. The Non-Modified Zeolite (NMZ and Surfactant-Modified Zeolites (SMZ were characterized by X-ray fluorescence spectrometry, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR, scanning electron microscopy, thermogravimetric analysis, among others. The SMS presented negative charge probably due to the formation of a partial bilayer of HDTMA on exchangeable active sites on the external surface of NMZ. A decrease in surface area was observed for SMZ as compared to NMZ indicating zeolite surface coverage with HDTMA-Br molecules. The crystalline nature of the zeolite remained intact after adsorption of surfactant and heating for drying. FTIR analysis indicated that there were no significant changes in the structure of the zeolite after adsorption of surfactant.

  12. Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: efeito da incorporação do surfactante na estrutura e propriedades

    Directory of Open Access Journals (Sweden)

    Sílvia Daniela Araújo da Silva Ramôa

    2014-01-01

    Full Text Available Nanocompósitos de montmorilonita/polipirrol (MMT/PPy foram preparados a partir da polimerização in situ do pirrol na presença de argila, bentonita sódica natural, (MMT-Na+ em solução aquosa com ou sem surfactante aniônico, dodecil sulfato de sódio (SDS, utilizando-se o cloreto de ferro (III hexahidratado (FeCl3.6H2O, como oxidante. A estrutura e propriedades dos nanocompósitos obtidos pela polimerização in situ do pirrol na presença de SDS (MMT/PPy.SDS e sem surfactante (MMT/PPy foram avaliadas e comparadas a partir da espectroscopia de infravermelho com transformada de Fourier (FTIR, difração de raios X (DRX, microscopia eletrônica de varredura (MEV, microscopia eletrônica de transmissão (MET, análise termogravimétrica (TG e método padrão quatro pontas. Os difratogramas dos nanocompósitos revelaram que o espaçamento basal d001 da MMT (1,42 nm foi alterado para valores maiores, indicando a intercalação do PPy na MMT para ambos os nanocompósitos obtidos. Os difratogramas e as imagens de MET e MEV dos nanocompósitos de MMT/PPy.SDS confirmaram que a presença do SDS na reação promoveu, além da intercalação, esfoliação parcial da argila. Os nanocompósitos MMT/PPy.SDS apresentaram condutividade elétrica (9,50 S/cm maior do que o nanocompósito de MMT/PPy (4,44 S/cm. A presença da argila melhorou de forma significativa a estabilidade térmica do PPy.

  13. Efecto de los surfactantes sobre la absorción de agroquímicos en plantas

    Directory of Open Access Journals (Sweden)

    José Antonio Vera-Núñez

    2009-01-01

    Full Text Available Introducción. La eficiencia de absorción y removilización de una molécula o compuesto químico aplicado a un sistema biológico depende de interacciones entre factores bióticos y abióticos. Para el caso de vegetales, destaca la composición físico-química y concentración de la molécula, el estado fisiológico del órgano donde se aplica y el manejo del producto (dosis y forma de aplicación. Existen diferentes tecnologías a base de compuestos químicos tensoactivos que permiten aumentar la absorción del compuesto aplicado en plantas de interés agrícola. El objetivo de este trabajo fue evaluar el efecto del surfactante INEX-A (COSMOCELMR sobre la absorción de compuestos con actividad sistémica comúnmente aplicados en la agricultura a través del marcaje isotópico bajo condiciones de invernadero. Métodos. Se desarrollaron los ensayos siguientes: 1 herbicida (14C-Glifosato aplicado vía foliar en zacate Johnson (Sorghum halepense, 2 insecticida (14C-Imidacloprid aplicado vía foliar, 3 insecticida (14C-Imidacloprid aplicado vía suelo y 4 nutrimento (32P-Fosfato de amonio monobásico aplicado vía foliar en tomate (Lycopersicum esculentum. Resultados. El efecto del surfactante INEX-A aumentó la absorción de las moléculas en estudio en comparación con los tratamientos donde no se aplicó éste surfactante, esto generó una mayor removilización de las moléculas y probablemente una mayor producción de metabolitos secundarios que tienen como origen o intermediario a dichas moléculas. El efecto del surfactante INEX-A osciló en el rango 22-100 % en relación al incremento de la absorción de las moléculas en estudio. Cuando se aplicó el surfactante INEX-A se incrementó 12 veces la absorción del insecticida 14C-Imidacloprid aplicado vía foliar. Asimismo, la removilización hacia el grupo de hojas superiores vs. hojas inferiores fue mayor. Además, el efecto del INEX-A presentó una relación directa en función al tipo de

  14. COMPOSICIÓN DEL SURFACTANTE, DESARROLLO PULMONAR Y PRUEBAS DE MADURACIÓN EN EL FETO.

    Directory of Open Access Journals (Sweden)

    Ariel Iván Ruiz-Parra

    2010-01-01

    Full Text Available

    Resumen

    El surfactante pulmonar es una sustancia tensoactiva producida por los neumocitos tipo II, cuya concentración en el recién nacido prematuro/ inmaduro está disminuída, llevando a la producción del síndrome de dificultad respiratoria. El surfactante está constituído en un 85% por lípidos, del tipo fosfolípidos en su mayoría. El resto son proteínas surfactantes.

    Los fosfogliceridos (lecitinas y la esfingomielina forman el grupo de fosfolipidos involucrados. La fosfatidil colina y la dipalmitoil fosfatidil colina son las lecitinas más abundantes en el líquido extracelular que recubre los alvéolos pulmonares normales y en el surfactante pulmonar que disminuye su tensión superficial. Así se evita la atelectasia al final de la fase espiratoria de la respiración. En el neumocito II, enzimas remodelan las diferentes lecitinas para convertirlas en dipalmitoil fosfatidil colina.

    Una vez que el surfactante es producido en el neumocito, esta substancia migra como “cuerpos la melares” desde el núcleo hasta la superficie apical de la célula desde donde es liberado por exocitosis dentro del alveolo.

    Menos de un 0.1% de los recién nacidos presentan Síndrome de Dificultad Respiratoria (llamado antiguamente Enfermedad de Membrana Hialina cada año, y alrededor de un 10 % de estos mueren. La administracion de corticoesteroides incrementa la madurez pulmonar en casos de riesgo de parto prematuro, o cuando es necesario realizar una cesárea lo más temprano posible. El tratamiento de los bebes prematuros que presentan SDR incluye la administración de surfactantes dentro del árbol traqueobronquial.

    El patrón oro de la determinación de madurez pulmonar fetal es la relación lecitina/esfingomielina (L/E, aunque hay algunas otras pruebas como la medición de cuerpos la melares, que resultan confiables, económicas y más fácilmente disponibles en hospitales de menor categor

  15. COMPOSICIÓN DEL SURFACTANTE, DESARROLLO PULMONAR Y PRUEBAS DE MADURACIÓN EN EL FETO.

    OpenAIRE

    Ariel Iván Ruiz-Parra; Liliana Muñoz; Ligia Ome

    2010-01-01

    Resumen

    El surfactante pulmonar es una sustancia tensoactiva producida por los neumocitos tipo II, cuya concentración en el recién nacido prematuro/ inmaduro está disminuída, llevando a la producción del síndrome de dificultad respiratoria. El surfactante está constituído en un 85% por lípidos, del tipo fosfolípidos en su mayoría. El resto son proteínas surfactantes.

    Los fosfogliceridos (lecitinas) y la esfingomielina forman el grupo de fosfolipi...

  16. Preparatory of X zeolite (faujasite) with surfactant hexa decyl trimethyl ammonium bromide (HMDTA) for adsorption of organic compounds; Acondicionamiento de zeolita X (faujasita) con surfactante bromuro de hexa decil trimetil amonio (HDTMA) para adsorcion de compuestos organicos

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez R, V

    2003-07-01

    The water represents one of the most valuable natural resources for the alive beings, since it is the essential component of the alive matter. Also, it is fundamental part of our planet, since is an indispensable element for the integral development of the same one. The demographic growth, the human being's activities and the industrial growth, he/she brings as consequence an increase in the use of the water and the generation of residual waters that successively contaminate the hydrological basins, becoming an environmental problem urgent. The contamination of the water with compound such as phenol and benzene, it is a problem that it requires the search of solutions, since it is of compound not very biodegradable, able to accumulate through the food chains and very toxic to the alive beings that they enter in contact with them (Tolgyessy, 1993). In the human beings it can take place damages in liver and kidney, the Agency of Protection to the Atmosphere of the United States (EPA) it considers that the exhibition for benzene is related with the leukemia, it is also considered as a carcinogen substance. Of the methods that are used for the treatment of polluted waters, it highlights the use of adsorber and one of them is the zeolites, since they are broadly used in those separation processes. The zeolites is crystalline aluminosilicates, they are characterized for to have a big superficial area and for their great capacity of exchange cationic, due to it the process of adsorption depends on these two characteristics, since to the modified being superficially for surfactants cationic it originates an enriched layer of carbon organic, which has the capacity to remove pollutants of the water. The present work outlines as objective to carry out the superficial modification of zeolite X using hexa decyl trimethyl ammonium bromide (HMDTA-Br) to different concentrations, with the purpose of making it useful in the removal of pollutants organic, present in watery

  17. SÍNTESE E CARACTERIZAÇÃO DE SURFACTANTES ALQUILFENIL POLIGLICOSÍDICOS A PARTIR DA AMILOSE E ALQUIL FENÓIS EXTRAÍDOS DO LCC NATURAL

    Directory of Open Access Journals (Sweden)

    Francisco C. F. de França

    Full Text Available The surfactants were synthesized by condensing the obtained oligosaccharides of amylose and alkyl phenols extracted from the natural cashew nut shell liquid (nCNSL. The Nuclear Magnetic Resonance (NMR and Fourier Transform Infrared Spectroscopy (FTIR data showed aromatic ring bands, glycosidic rings, olefins and paraffins. The Nuclear Overhauser Effect Spectroscopy (NOESY experiments showed that the conformation of the glycosidic units is of the type 4C1 with an α anomeric configuration. The values of Gibbs free energy of micellization (ΔGºmic indicate that the spontaneity of formed micelles are cardanyl oligoglycosides > cardyl oligoglycosides > anacardyl oligoglycosides. The surface tension (γ measurements showed that critical micelle concentration (cmc values were low for surfactants. The study γ versus lnc (g dm-3 indicated that the aggregation behavior of the surfactants is dependent on their structural characteristics, as well as their thermal behavior. The area per molecule (A values indicates that cardyl oligoglycosides are likely to form aggregates smaller than cardanyl oligoglycosides and anacardyl oligoglycosides. The critical packing parameter (cpp indicates that the aggregates are of the vesicles and bilayers.

  18. Terapia com surfactante pulmonar exógeno: o que é estabelecido e o que necessitamos determinar Exogenous surfactant therapy: what is established and what still needs to be determined

    Directory of Open Access Journals (Sweden)

    Celso M. Rebello

    2002-12-01

    Full Text Available Objetivos: revisar os aspectos já consagrados da terapêutica com surfactante exógeno, e discutir o estágio atual da pesquisa onde ainda não existe consenso. Fonte dos dados: revisão bibliográfica, utilizando o banco de dados Medline e Cochrane Database Library, associada à experiência dos autores em relação à terapêutica de reposição do surfactante exógeno. Síntese dos dados: os aspectos principais em relação às características do surfactante: composição, pool, metabolismo, inativação e efeitos imediatos após sua administração já estão bem estabelecidos. Mas ainda permanecem diversas dúvidas em relação ao uso do surfactante exógeno, que ainda é preciso determinar, como a escolha do tipo de surfactante, o momento mais apropriado para o tratamento, a dose e o número de doses, a melhor técnica de administração e as complicações associadas ao seu uso. Atualmente, a pesquisa no campo da terapêutica com surfactante exógeno concentra-se em duas linhas principais: o uso do surfactante em outras patologias que não a síndrome de desconforto respiratório do recém-nascido, e o desenvolvimento de novos surfactantes através da adição de proteínas, ou análogos de proteínas, com o objetivo de melhorar sua ação e de reduzir sua inativação por proteínas plasmáticas. Conclusões: hoje, a utilização do surfactante exógeno tornou-se rotina dentro das unidades de terapia intensiva neonatais, mas permanece aberto um campo de pesquisa tanto em nível experimental como clínico.Objective: to review well-known aspects of exogenous surfactant therapy, and to discuss controversial points regarding the current state of research. Sources: review of the literature, using Medline and Cochrane Database Library, in association with the authors' experience in relation to exogenous surfactant replacement therapy. Summary of the findings: the main aspects of surfactant characteristics: composition, pool, metabolism

  19. Different doses of exogenous surfactant for treatment of meconium aspiration syndrome in newborn rabbits Estudo dos efeitos de diferentes doses de surfactante exógeno para o tratamento da síndrome de aspiração de mecônio em coelhos recém-nascidos

    Directory of Open Access Journals (Sweden)

    João Cesar Lyra

    2004-01-01

    Full Text Available OBJECTIVE: To evaluate the effects of 2 different doses of exogenous surfactant on pulmonary mechanics and on the regularity of pulmonary parenchyma inflation in newborn rabbits. METHOD: Newborn rabbits were submitted to tracheostomy and randomized into 4 study groups: the Control group did not receive any material inside the trachea; the MEC group was instilled with meconium, without surfactant treatment; the S100 and S200 groups were instilled with meconium and were treated with 100 and 200 mg/kg of exogenous surfactant (produced by Instituto Butantan respectively. Animals from the 4 groups were mechanically ventilated during a 25-minute period. Dynamic compliance, ventilatory pressure, tidal volume, and maximum lung volume (P-V curve were evaluated. Histological analysis was conducted using the mean linear intercept (Lm, and the lung tissue distortion index (SDI was derived from the standard deviation of the means of the Lm. One-way analysis of variance was used with a = 0.05. RESULTS: After 25 minutes of ventilation, dynamic compliance (mL/cm H2O · kg was 0.87 ± 0.07 (Control; 0.49 ± 0.04 (MEC*; 0.67 ± 0.06 (S100; and 0.67 ± 0.08 (S200, and ventilatory pressure (cm H2O was 9.0 ± 0.9 (Control; 16.5 ± 1.7 (MEC*; 12.4 ± 1.1 (S100; and 12.1 ± 1.5 (S200. Both treated groups had lower Lm values and more homogeneity in the lung parenchyma compared to the MEC group: SDI = 7.5 ± 1.9 (Control; 11.3 ± 2.5 (MEC*, 5.8 ± 1.9 (S100; and 6.7 ± 1.7 (S200 (*P OBJETIVO: Avaliar os efeitos de duas diferentes doses de surfactante exógeno sobre a mecânica pulmonar e sobre a regularidade da expansão do parênquima pulmonar em coelhos recém-nascidos. MÉTODO: Coelhos recém-nascidos foram traqueostomizados e randomizados em quatro grupos de estudo: grupo-Controle, sem aspiração de mecônio; grupo MEC, com aspiração de mecônio e sem tratamento com surfactante exógeno; grupos S100 e S200, ambos com aspiração de mecônio e tratados

  20. Uso de surfactante exógeno no tratamento da bronquiolite viral grave: relato de caso Exogenous surfactant treatment for severe acute viral bronchiolitis: case report

    Directory of Open Access Journals (Sweden)

    Luciano S. Vitola

    2001-04-01

    Full Text Available OBJETIVO: descrever os possíveis efeitos clínicos e laboratoriais da instilação traqueal de surfactante exógeno a um lactente com bronquiolite viral aguda grave e submetido a ventilação mecânica. RELATO: menina de 2 meses de idade com diagnóstico clínico de bronquiolite viral aguda e submetida a ventilação mecânica, necessitando de altos picos de pressão inspiratória positiva (35 a 45 cmH2O e elevada fração de oxigênio inspirado (FiO2= 0,9, sem resposta clínica favorável ou melhora na gasometria arterial. Optou-se por instilar surfactante exógeno endotraqueal (Exosurf®, Glaxo - 50 mg/kg para permitir utilizar um regime ventilatório menos agressivo. RESULTADOS: quatro horas após a administração do surfactante, foi possível reduzir o pico inspiratório de pressão (PIP de 35 para 30 cmH2O; a FiO2 de 0,9 para 0,6 e aumentar a pressão positiva ao final da expiração (PEEP de 6 para 9 cmH2O. Neste período observou-se uma elevação na relação paO2/FiO2 de 120 para 266. Ao completar 24 horas, a FiO2 pôde ser reduzida até 0,4. DISCUSSÃO: neste relato pretendemos demonstrar que a inativação do surfactante pode ser um fator decisivo na evolução desfavorável de alguns casos graves de bronquiolite. A instilação traqueal de surfactante, nestes casos, além de promover uma rápida resposta clínica, permite que se adotem técnicas ventilatórias menos agressivas.OBJECTIVE: to describe the possible clinical and laboratory effects of exogenous surfactant instillation into the tracheal tube of a child with severe acute bronchiolitis undergoing mechanical ventilation. CASE REPORT: a 2-month-old girl with clinical diagnosis of acute viral bronchiolitis underwent mechanical ventilation. She required high positive inspiratory peak pressure (35 to 45 cmH2O and high inspiratory fraction of oxygen (FiO2 = 0.9, but showed no clinical response or improvement in the arterial blood gas analysis. An exogenous surfactant (Exosurf

  1. Biofilmes de gelatina: Efeito da adição de surfactante e ácidos graxos de óleo de coco na permeabilidade ao vapor de água

    Directory of Open Access Journals (Sweden)

    Thiago Azevedo de Oliveira

    2012-11-01

    Full Text Available O presente trabalho teve por objetivo avaliar o efeito da adição de surfactante tween 20 e ácidos graxos de óleo de coco na permeabilidade ao vapor de água de biofilmes de gelatina. O experimental foi realizado em delineamento inteiramente casualizados (DIC, disposto em esquema fatorial 2 x 5, com 3 repetições, em que o primeiro fator corresponde ao dos tratamentos com tween 20 e ácidos graxos de óleo de coco, e o segundo termo corresponde a concentração (0%, 12.5%, 25%, 37.5% e 50% em relação a massa de gelatina. Para isso os biofilmes gelatina nas diferentes concentrações foram preparados pelo método de casting utilizando-se como plastificante o glicerol. Após a formação do filme, sua propriedade de permeabilidade ao vapor de água foi determinada. Os filmes compostos com ácidos graxos de óleo de coco apresentaram em todas as concentrações estudadas valores de permeabilidade ao vapor de água, significativamente, menores dos que os filmes compostos por surfactante tween 20 em todas suas concentrações. .A adição de ácidos graxos e surfactante aumentaram a espessura dos filmes.A adição de surfactante tween 20 e o aumento de sua concentração proporcionaram o aumento na permeabilidade ao vapor de água, enquanto que a adição de ácidos graxos de óleo de coco e o aumento de sua concentração proporcionou uma redução da permeabilidade ao vapor de água.  

  2. TOXICIDAD DE HERBICIDAS PROMISORIOS PARA EL CONTROL DE Dieffenbachia oerstedii EN HIJOS DE BANANO

    Directory of Open Access Journals (Sweden)

    Steven Brenes-Prendas

    2012-01-01

    Full Text Available Entre los meses de agosto a diciembre del 2006, se evaluó la toxicidad potencial y el efecto sobre el crecimiento de hijos espada de banano, bajo seis tratamientos herbicidas para el control de sainillo: testigo absoluto (T1, carfentrazone + surfactante (T2, glifosato + surfactante (T3, glifosato + carfentrazone + surfactante (T4, glifosato + sulfato de amonio + surfactante (T5 y metsulfuron metil + carfentrazone + surfactante (T6. Se utilizó un diseño irrestricto al azar con 20 repeticiones, para un total de 120 hijos. El tratamiento con metsulfuron metil afectó el crecimiento de los hijos espada, causando la muerte de algunos de ellos, mientras que el glifosato + carfentrazone + surfactante no afectó a los hijos espada y no se diferenció del testigo. Se confi rma el potencial del tratamiento glifosato + carfentrazone como alternativa para el control del sainillo en plantaciones comerciales de banano, pues provee un control aceptable de la maleza con selectividad a los hijos espada del cutlivo.

  3. Composición de gentamicina, un surfactante aniónico, y un copolímero

    OpenAIRE

    Ventosa Rull, Nora; Veciana Miró, Jaume; Sala Vergés, Santiago; Elizondo Sáez de Vicuña, Elisa; Blanco Prieto, María José; Gamazo de la Rasilla, Carlos; González Fernández, David; Imbuluzqueta Iturburua, Edurne

    2007-01-01

    Composición de gentamicina, un surfactante aniónico, y un copolímero. La invención se refiere a una composición que comprende gentamicina, un surfactante aniónico, y un copolímero de metil vinil éter y un derivado de ácido maleico, en donde la gentamicina y el surfactante aniónico forman un complejo iónico. Dicha composición se prepara mediante a) la disolución de un complejo iónico de gentamicina y un surfactante aniónico, y un copolímero de metil vinil éter y un d...

  4. Influencia del reclutamiento alveolar sobre los efectos del surfactante exógeno Influence of pulmonary recruitment on exogenous surfactant effects

    Directory of Open Access Journals (Sweden)

    Néstor R. Herrera

    2006-02-01

    Full Text Available Se investigaron los efectos producidos por una maniobra de insuflación sostenida previa a la administración de surfactante exógeno y los producidos por diferentes patrones ventilatorios sobre la respuesta al mismo. Se estudiaron 20 ratas albinas adultas a las que se les produjo una injuria pulmonar por repetidos lavados con solución fisiológica. Se evaluó el pH, PaO2, PaCO2, la presión arterial sistólica, la compliance toracopulmonar y la histología. Los animales se dividieron en 2 grupos según se les hubiera aplicado o no insuflación sostenida para evaluar el efecto inmediato de la misma. Posteriormente los grupos citados fueron subdivididos en función de la capacidad residual funcional (CRF aplicada, quedando conformados 4 grupos experimentales. El grupo 1 recibió previo al surfactante una insuflación sostenida de 30 cm H2O durante 15 segundos y se ventiló posteriormente con presión al final de la espiración (PEEP de10 cm H2O. El grupo 2, no recibió insuflación sostenida y se ventiló con PEEP 10 cm H2O. El grupo 3, recibió insuflación sostenida y se ventiló con PEEP 4 cm H2O y el grupo 4, sin insuflación sostenida se ventiló con PEEP 4 cm H2O. Los efectos inmediatos del surfactante no fueron modificados por la aplicación previa de insuflación sostenida. Se verificó durante el transcurso de la experiencia un aumento de la PaO2 asociada al aumento de la capacidad residual funcional (Grupo1 p=0.0001; Grupo2 p= 0.0001, e independiente de la insuflación sostenida. El uso de insuflación sostenida previo a la administración de surfactante sumado a la ventilación con capacidad residual funcional alta se asoció con infiltración de polimorfonucleares debajo del epitelio bronquiolar (p = 0.008. Nuestros resultados no avalan el uso de insuflación sostenida previo a la administración de surfactante exógeno.An experimental modelwas devised to study the effects of a sustained insufflation maneuver on the immediate

  5. Efeitos na função pulmonar após utilização de surfactante pulmonar exógeno na síndrome do desconforto respiratório agudo na criança

    Directory of Open Access Journals (Sweden)

    Carvalho W.B. de

    1997-01-01

    Full Text Available A síndrome do desconforto respiratório agudo (SDRA é uma lesão pulmonar de causa multifatorial em que o sistema surfactante se apresenta alterado por causa da sua inativação e comprometimento da composição e metabolismo. A utilização do surfactante pulmonar exógeno é uma opção terapêutica que visa manter a estabilidade alveolar, propiciando, dessa forma, a melhora da complacência pulmonar (aumentando a capacidade residual funcional, da oxigenação e da mecânica respiratória. Os autores relatam o estudo realizado com a utilização de uma dose de surfactante pulmonar exógeno em dois pacientes pediátricos com SDRA submetidos a ventilação pulmonar mecânica. Avaliam os pacientes com gasometria arterial e venosa pré e pós-utilização de surfactante, sendo observada melhora na oxigenação, redução do shunt intrapulmonar, melhora da ventilação imediatamente após a instilação da preparação na cânula orotraqueal e retorno à situação pré-administração após 240 minutos, no caso 1, e após 120 minutos, no caso 2. Concluem que ainda são necessários vários estudos clínicos prospectivos e randomizados para avaliar, de forma eficaz, essa modalidade terapêutica na SDRA.

  6. TOXICIDAD AGUDA Y LESIONES HISTOPATOLÓGICAS EN CACHAMA BLANCA (Piaractus brachypomus EXPUESTAS A LA MEZCLA DE HERBICIDA ROUNDUP® MÁS SURFACTANTE COSMOFLUX® 411F

    Directory of Open Access Journals (Sweden)

    Pedro Eslava M

    2009-04-01

    Full Text Available Objetivo. Determinar la concentración letal 50 (CL50 y lesiones anatomopatológicas inducidas por la exposición a la mezcla del herbicida Roundup® más el surfactante Cosmoflux® 411F en juveniles de cachama blanca (Piaractus brachypomus. Materiales y métodos. Ejemplares de 44.5 ± 3.7 g de peso fueron expuestos por 96 h a varias concentraciones de la mezcla herbicida más surfactante. Se registró la mortalidad al cabo de las 96 h y se tomaron muestras de tejidos para evaluación histopatológica. Resultados. La CL50 fue de 23.42 mg.l-1 para el Roundup® y de 0.19 mg.l-1 para el Cosmoflux® 411F (p<0.05 en la mezcla. En las branquias se hallaron lesiones necróticas proliferativas, y aneurismas y hemorragias en las lamelas. En el hígado se observaron procesos apoptóticos y necróticos de los hepatocitos, vacuolización lipídica y gotas hialinas citoplasmáticas en los mismos. En el telencéfalo se halló necrosis y apoptosis de cuerpos neuronales asociados y no asociados a células granulares eosinofílicas/células mast, y gliosis. En el intestino se evidenció vacuolización del borde apical de los enterocitos, e infiltración leucocitaria en la lámina propia. En la piel se halló hiperplasia e hipertrofia de células pavimentosas y células de moco, infiltración leucocitaria epidermal y acumulación subepidermal de pigmentos. En el riñón caudal se observaron hemorragias y lesiones necróticas multifocales. Conclusiones. La mezcla Roundup® más Cosmoflux® 411F ocasiona lesiones histopatológicas en branquias, piel, cerebro, hígado, intestino anterior y riñón caudal en juveniles de cachama blanca expuestos a las concentraciones y proporción evaluadas.

  7. Co-digestão anaeróbia de substâncias surfactantes, óleo e lodo de esgoto Anaerobic codigestion of surfactants substances, oil and sludge of sewage

    Directory of Open Access Journals (Sweden)

    Maria José Comandante Costa

    2007-12-01

    Full Text Available O objetivo deste trabalho foi investigar a viabilidade de se tratar conjuntamente substâncias surfactantes, óleo mineral e lodo de esgoto sanitário. Para todos os tratamentos foram analisadas as concentrações de matéria orgânica (DQO afluente e efluente. O sistema experimental foi monitorado durante 150 dias e diariamente eram realizadas quantificações do volume e da composição do biogás produzido. Foram constatadas remoções de DQO filtrada média de 82% aos 18 dias, e para DQO bruta em torno de 76% para os seis tratamentos aos 100 dias de operação. A produção de metano observada durante o período experimental demonstrou que as diferentes concentrações de surfactantes presentes no sistema não se mostraram tóxicas o suficiente para inibir as bactérias metanogênicas.The present work had as objective investigate the viability of treating, through processes anaerobic substances surfactants, mineral oil and sewage sludge. For all the treatments the concentrations of organic matter were analyzed (COD influent and effluent. The experimental system was monitored for 150 days. The volume and composition of the produced biogas were daily quantificated. Removals of filtered COD average were verified from 82% to the 18 days and for raw COD around 76% for the six treatments to the 100 dias.de operation. The methane production observed during the experimental period demonstrated that the different concentrations of present surfactants in the system were not shown toxicant enough to inhibit the methanogenic bacterias.

  8. CONCRETO TRANSLÚCIDO – LUZ NATURAL PARA AMBIENTES FECHADOS

    Directory of Open Access Journals (Sweden)

    Sayonara Michelle Mesquita Paiva Paiva

    2017-08-01

    Full Text Available RESUMO: O concreto por ter ampla utilização na construção civil, é constantemente objeto de pesquisas entre os estudiosos, sempre com o intuito de melhorar suas propriedades e aumentar seu uso nas edificações. O concreto é uma mistura de aglomerantes, agregados, aditivos e água. O concreto trouxe para a construção civil a possibilidade de projetar e executar as mais variadas formas, no entanto sempre foi um desafio para arquitetos e engenheiros a questão da iluminação nos ambientes fechados. Foi diante dessa dificuldade que surgiu um novo material no mercado, um concreto capaz de aliar as propriedades do concreto convencional com a iluminação natural, o Concreto Translúcido. O Concreto Translúcido é composto por concreto convencional e fibras ópticas, são essas fibras que permitem a passagem de luz através do concreto, conferindo assim um material favorável ao meio ambiente, tendo em vista que o consumo de energia pode ser reduzido. Este trabalho tem por objetivo mostrar as características desse novo material, suas vantagens e desvantagens e suas aplicações no Brasil e no mundo.

  9. Avaliação da estabilidade da emulsão óleo/água proveniente dos resíduos de uma indústria beneficiadora de gemas frente ao uso de diferentes surfactantes

    Directory of Open Access Journals (Sweden)

    Simone Stülp

    2013-01-01

    Full Text Available A reutilização dos resíduos gerados pelos diversos setores industriais é uma prática que cada dia é mais utilizado, devido ao comprometimento das indústrias com sua responsabilidade social (proteção ao ambiente ou a exigências dos órgãos de proteção ambiental, já que muitos resíduos não possuem o devido descarte. Na indústria de beneficiamento de gemas a busca pelo reaproveitamento dos resíduos também tem se tornado uma realidade. O presente trabalho tem como objetivo avaliar o reaproveitamento do óleo utilizado como lubrificante na indústria de beneficiamento de gemas, juntamente com água, surfactantes e anticorrosivos. Para preparo das emulsões foram utilizadas amostras de óleo diesel utilizado como lubrificante no setor de corte deste tipo de indústria, mais os seguintes surfactantes: Tween 20, Tween 80, Lauril Éter Sulfato de Sódio (SLES e Cetiol HE. Depois de realizadas análises de pH, viscosidade, densidade e separação de fases nestas emulsões, chegou-se a conclusão que o surfactante Lauril Éter Sulfato de Sódio proporcionava a melhor formulação. Utilizando-se deste resultado, foram preparadas novas emulsões com o surfactante Lauril Éter Sulfato de Sódio e um anticorrosivo, neste caso, o molibdato de sódio. Nestas soluções contendo molibdato de sódio mais óleo e surfactante foram realizadas análises de resistência à corrosão deste sistema, utilizando-se de placas de aço SAE 1020, pela análise de perda de massa. Após estas análises, verificou-se que a adição de um anticorrosivo pode reduzir ou inibir a oxidação, mas em outros casos, como neste estudo, pode promover uma oxidação ainda maiorAbstract The reuse of waste generated by various industrial sectors is a practice that has been increasingly used due to impairment of industries with their social responsibility (environmental protection or the requirements of the protection of the environment, since many residues do not have

  10. Estudo da auto-associação de biopolímeros com surfactantes

    OpenAIRE

    Modolon, Samuel de Medeiros

    2009-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Química. A interação entre surfactantes e dois biopolímeros, o etil( hidroxietil) celulose (EHEC) e a caseína foi investigada usando as técnicas de condutividade elétrica, tensão superficial e espectroscopia de fluorescência. Verificou-se e interpretou-se a variação dos parâmetros de concentração de agregação crítica, cac, e ponto de saturação do polímero...

  11. A natural adsorbent for natural gas industry; Um adsorvente nacional para a industria do gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Cachina, G.H.A.B.; Silveira, V.R.; Melo, D.M.A. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil); Balthar, A.R.; Oliveira, V.M.; Bayer, M.M. [CTGAS - Centro de Tecnologias do Gas, Natal, RN (Brazil); Barbosa, C.M.M. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2004-07-01

    One the natural pollutants in the natural gas considered critical in reference to the corrosion is the H{sub 2}S. Its presence depends on the origin, as well as the own process used in the gas treatment, it can bring problems to the pipes and the final applications of natural gas (NG). The National Petroleum Agency (ANP) in its entrance number 104/02, establishes that the quantity of H{sub 2}S in NG, of national or imported origin, commercialized at the country can only be at the most 10 - 15 mg/m{sup 3}. In the Natural Gas Processing Unit (UPGN) different methods are used for the removal of H{sub 2}S, the absorption process (e.g. with aminas, Sulfinol{sup R} process) or for adsorption in tower filled with activated coal, zeolites and Sulfatreat{sup R}. In this work, the adsorbent material used is the mineral clay Paligorsquita. That class of clay minerals characterized by pores and a crystalline structure containing Tetrahedral layers linked by chains of longitudinal secondary lines. The typical unitary cell is formed basically by moisturized oxides of aluminum, Sicilian and magnesium of (Mg, Al)5SiO2O(OH)2(H20)4.4H20, with Mg specially located in octahedral sites. (author)

  12. Perfil lipídico sérico de ratos tratados com surfactante

    Directory of Open Access Journals (Sweden)

    Karina Ferreira de Castro

    2012-06-01

    Full Text Available A aterosclerose é uma doença multifatorial, lenta e progressiva e a hiperlipidemia um dos fatores potenciais no desenvolvimento de doenças cardíacas ateroscleróticas. As vantagens da indução das dislipidemias experimentais são a produção de lesões ateromatosas em curto espaço de tempo; adequado controle dietético e fatores ambientais; a possibilidade de estudos sobre a reversibilidade de lesões ateroscleróticas e ensaios pré-clínicos de substâncias hipolipidêmicas. Este estudo visou avaliar o perfil lipídico sérico de ratos tratados com surfactante. Foram utilizados 28 ratos Wistar, machos, albinos, adultos e hígidos. Estes foram distribuídos em quatro grupos experimentais formados por sete animais cada, a saber: Grupo I – (controle; Grupo II – tratado com tyloxapol, na dose de 500 mg/kg de peso corporal, via intraperitoneal a cada 48 horas, durante duas semanas; Grupo III – tratado com tyloxapol na dose de 500 mg/kg de peso corporal, via intraperitoneal a cada 48 horas, durante três semanas; Grupo IV – tratado com tyloxapol na dose de 500 mg/kg de peso corporal, via intraperitoneal a cada 48 horas, durante quatro semanas. Na avaliação do perfil lipídico, os valores de triacilgliceróis e HDL demonstraram que o grupo III diferiu significativamente do grupo I e os valores de colesterol total e LDL indicaram que o grupo I diferiu significativamente dos grupos II, III e IV. Conclui-se que o surfactante tyloxapol foi efetivo na indução da hiperlipidemia.

  13. Antimicrobial activity of surfactants produced by Bacillus subtilis R14 against multidrug-resistant bacteria Atividade antimicrobiana de surfactantes produzidos por Bacillus subtilis R14 frente a bacterias multidroga-resistentes

    Directory of Open Access Journals (Sweden)

    Paulo André Vicente Fernandes

    2007-12-01

    14, frente a bactérias multidroga-resistentes. Durante o cultivo em meio quimicamente definido, a tensão superficial do meio foi reduzida de 54 mN/m no início do crescimento microbiano para 30 mN/m depois de 20 h. Uma concentração de surfactante bruto de 2 g/L foi obtida depois de 40h de cultivo. Uma caracterização preliminar sugeriu que dois surfactantes foram produzidos. A avaliação antimicrobiana destes compostos foi realizada frente a vinte e nove bactérias. O perfil de multidroga-resistência foi previamente definido para Enterococcus faecalis (11 cepas Staphylococcus aureus (6 cepas, Pseudomonas aeruginosa (7 cepas e Escherichia coli IC18. Todas as cepas foram sensíveis aos surfactantes, em particular Enterococcus faecalis. Os resultados demonstraram que os lipopeptídios têm um amplo espectro de ação, incluindo microrganismos multidroga-resistentes.

  14. Desenvolvimento de metodologias para análise direta de óleos vegetais empregando microemulsões de água em óleo e meios não aquosos

    OpenAIRE

    Carla Rosane Barboza Mendonça

    2005-01-01

    Amostras de óleo vegetal foram preparadas na forma de microemulsão de água em óleo (w/o) utilizando dodecil sulfato de sódio (SDS) como surfactante e um álcool como co-surfactante. As microemulsões foram caracterizadas através de medidas de viscosidade, índice de refração, condutividade elétrica, espalhamento de luz dinâmico e voltametria. Ensaios preliminares para a quantificação de analitos por análise direta foram realizados por voltametria linear e eletroforese capilar. As microemulsões d...

  15. Estratégias para luz natural: sistemas inovadores.

    Directory of Open Access Journals (Sweden)

    Juliana Saiter Garrocho

    2007-07-01

    Full Text Available Diversos sistemas, estratégias e componentesinovadores de alta tecnologia paraa otimização do uso da luz natural noprojeto de arquitetura têm se desenvolvidoatualmente, principalmente na EuropaCentral, nos Estados Unidos e na Austrália.Este artigo apresenta algumas dessasestratégias descrevendo suas principaiscaracterísticas. Palavras-chave: luz natural, estratégias deprojeto, sistemas inovadores de alta tecnologia.

  16. Uma "paisagem natural intocada" para o ecoturista vindo da cidade

    Directory of Open Access Journals (Sweden)

    Paola Verri de Santana

    2006-12-01

    Full Text Available The em ergence of the ecological aw areness is characterized by dissem ination by the com m unication m edia and by the increasing num ber of "adepts" or "volunteers" interested in the "green cause". The form ation of what was called ecological discourse com prehends the m ost different postures, like those from activists, scientists, governm ents and businessm en. The ecotourism appears on this scene as yet another econom ic activity with a proposal to value nature, to be chosen and incorporated to everyday life of those living in urban centers. This paper presents the main idea of an research that perform s a critical analysis on the ecological discourse dissem inated by the industrial sector which starts using the qualification of the "green" products as an argum ent to keep the wealth accum ulation

  17. Natural attenuation in contaminated soils with hydrocarbons; Atenuacion natural en suelos contaminados con hidrocarburos

    Energy Technology Data Exchange (ETDEWEB)

    Corona Ramirez, L.; Iturbide Arguelles, R. [Facultad de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2005-06-01

    A contaminated soil experiment was performed using simples from a refinery, containing oil derivative hydrocarbons, specifically those with high concentrations of polyaromathic hydrocarbons (PAH). The testing consisted in 7 pans with 7 kg of soil, the preparation of 6 pans under specific conditions and one as a blank, the conditions were: water content (15 y 30%), addition a non-ionic surfactant. The process consisted in the daily aeration and water control of the samples. The PAH were analyzed: anthracene, benzo(a) pyrene, chrysene, phenanthrene and naphthalene. The results after 8 weeks showed a gradual degradation of PAH, indicating a better removal obtained when the water content was 30% with nutrients addition. [Spanish] Se realizo un experimento con suelo contaminado proveniente de una refineria, el cual contaba con hidrocarburos derivados de petroleo, especificamente con concentraciones elevadas de hidrocarburos poliaromaticos (HAP). El estudio consistio en preparar 7 cajones con 7 kg de suelo, cada uno con las siguientes condiciones: S1suelo contaminado con hidrocarburos y 15% de contenido de agua. S2 suelo contaminado con hidrocarburo y adicion de Nitrogeno y Fosforo (N y P) con 15% de contenido de agua. S3 suelo contaminado con hidrocarburo y adicion de N y P mas un surfactante no ionico, Emulgin W600, con 15% de contenido de agua. S4 igual a S1 pero con 30% de contenido de agua. S5 igual a S2, con 30% de contenido de agua. S6 igual S3 con 30% de contenido de agua. S7 suelo contaminado testigo, sin control de humedad y sin aireacion. La experimentacion consistio en airear el suelo diariamente y controlar el contenido de agua de manera que este fuera constante. Los resultados, indican que la mejor remocion se obtuvo para el contenido de agua de 30%, con adicion de nutrientes y surfactante. Los compuestos con mayor eficiencia de remocion para todas las opciones son naftaleno y antraceno. Por lo tanto, de acuerdo con los resultados, los compuestos

  18. Economic evaluation of the use of exogenous pulmonary surfactants in preterm newborns in a Mexican population Evaluación económica de la utilización de surfactantes pulmonares exógenos en recién nacidos pretérmino en población mexicana

    Directory of Open Access Journals (Sweden)

    Guillermo Salinas-Escudero

    2012-01-01

    Full Text Available OBJECTIVE: To estimate the cost-effectiveness ratio of surfactant rescue treatment of premature infants with respiratory distress syndrome (RDS who are covered by the Medical Insurance for a New Generation. MATERIALS AND METHODS: A cost-effectiveness evaluation was conducted from the third-payer perspective. Comparisons were made between the use of bovine surfactant (BS therapy and without BS therapy. A decision tree model with a lifetime horizon was used where the measurements of effectiveness were life years gained (LYG and quality-adjusted life years (QALYs. A 5% discount rate was considered for costs and health outcomes. All costs are expressed in Mexican pesos 2009. RESULTS: Incremental cost-effectiveness ratios (ICER were MXN$136670 per LYG and MXN$125250 per QALY. CONCLUSION: Surfactant therapy was confirmed as a cost-effective strategy in accordance with World Health Organization criteria of three per capita gross domestic product (GDP per QALY in premature infants with RDS in Mexico.OBJETIVO: Estimar la razón de costo efectividad incremental del tratamiento de surfactante de rescate en pacientes pretérmino con Síndrome de Dificultad Respiratoria (SDR cubiertos por el Seguro Médico para una Nueva Generación. MATERIAL Y MÉTODOS: Evaluación de costo-efectividad desde la perspectiva del tercer pagador. Los comparadores fueron la terapia de surfactante bovino y la alternativa de no emplear ésta. Se utilizó un árbol de decisión que consideró la esperanza de vida como horizonte temporal y las medidas de efectividad fueron los años de vida ganados (AVG y los años de vida ajustados por calidad de vida ( AVAC.Resultados en pesos mexicanos del 2009. RESULTADOS: Las RCEI por AVG y AVAC fueron de MXN$136670 y MXN$125250. CONCLUSIÓN: La razón de costo por AVG y AVAC para la terapia de surfactantes en pacientes prematuros con SDR en México fue menor a tres veces el PIB per cápita, por lo que es una estrategia costo-efectiva seg

  19. Liquefied natural gas: a harbor plan; Plano diretor portuario para o gas natural liquefeito

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Aluisio de Souza; Baitelo, Ricardo Lacerda [Universidade de Sao Paulo (USP), SP (Brazil). Escola Politecnica; Rego, Erik Eduardo [Excelencia Energetica Consultoria Empresarial Ltda., Sao Paulo, SP (Brazil); Rosim, Sidney Olivieri [Rosim e Papaleo Consultoria e Participacoes Ltda., Sao Paulo, SP (Brazil)

    2008-07-01

    The objective of this article is to present the structuring of a port directing plan for the liquefied natural gas. In this sense, an integrated approach between the applied logistic and the requested market conditions was used. For the large distances transportation of liquefied natural gas, the marine modal must attain technical requirements that are not usual in the port routine. Apart from the proper dimensioning of the naval fleet in order to maximize the transported load, providing the optimization of the economic distance, the entire port infra-structure is planned for the reception of liquefied natural gas, in order to attend the physical peculiarities as well as security aspects of extreme importance. The selection of the studied local was motivated by the fuel supply shortage suffered by the country, especially in the northeast region, which owns already installed thermal units in need of the fuel supply to be operated. (author)

  20. Uso de corantes de origem natural para o tingimento de artigos têxteis de moda

    OpenAIRE

    Janice Accioli Ramos Rodrigues

    2013-01-01

    Diante do caos, principalmente ambiental e social, que o planeta terra tem vivenciado, muito tem se falado em sustentabilidade e suas correspondentes estratégias para tentar deter essa situação. Indo ao encontro desta iniciativa foi desenvolvido o presente trabalho, intitulado de Uso dos corantes de origem natural no tingimento de artigos têxteis de Moda cujo objetivo principal foi o de trazer pigmentações naturais sem formulações tão agressivas para a aplicação em artigos do vestuário de mod...

  1. Máscara laríngea ProSealTM como via de administração de surfactante no tratamento da síndrome do desconforto respiratório em recém-nascido pré-termo

    Directory of Open Access Journals (Sweden)

    Rosilu Ferreira Barbosa

    2012-06-01

    Full Text Available A administração de surfactante pela cânula traqueal e ventilação mecânica é o tratamento convencional da síndrome do desconforto respiratório em prematuros. Alterações hemodinâmicas e respiratórias da intubação traqueal e pré-medicação justificam a busca por alternativas menos invasivas de administração de surfactante. O objetivo do presente estudo foi descrever o uso da máscara laríngea ProSealTM como opção para o tratamento da síndrome do desconforto respiratório em recém-nascido pré-termo com 31 semanas de gestação, 1.335 g, dificuldade respiratória após a primeira hora de vida, e quadro clínico e radiológico de síndrome do desconforto respiratório. O surfactante foi administrado pela máscara laríngea ProSealTM com 3,5 horas de vida, com boa tolerância e sem necessidade de intubação traqueal. Gasometria normal e melhora radiológica, após 3 e 6 horas. O oxigênio foi suspenso após 8 dias; alta sem comorbidades. A máscara laríngea parece ser alternativa indolor e menos invasiva de via de tratamento da síndrome do desconforto respiratório, com possibilidade de redução de intubação traqueal e ventilação mecânica. Por meio de amostra adequada, devem ser confirmadas a eficácia e as vantagens dessa via de tratamento.

  2. El patrimonio natural y cultural como base para estrategias de turismo sustentable en la Sonora Rural

    Directory of Open Access Journals (Sweden)

    Patricia L. Salido Araiza

    2010-01-01

    Full Text Available Para la región del Río Sonora, el turismo es considerado una atractiva oportunidad de desarrollo regional, a la vez que un reto para el manejo de su patrimonio natural y cultural. Desde hace décadas, sus comunidades han venido perdiendo dinamismo económico de manera constante, reflejado en la depresión de su sector agropecuario, así como una tendencia decreciente de la población ante la falta de alternativas económicas regionales. Este trabajo se enfoca en el examen de las oportunidades y desafíos que presentan los factores naturales y culturales de la región, como bases de una propuesta de desarrollo turístico sustentable. Los resultados muestran que la Ruta del Río Sonora constituye, más que nada, un itinerario fundamentado en un área con alto contenido históricocultural y definido particularmente por la demanda del visitante actual. Es el significado de este patrimonio aunado al medio ambiente natural constituye una parte importante de su imagen. De ahí la necesidad de reconocer los valores de sus recursos naturales, históricos y culturales para resaltar el desarrollo del producto turístico y en particular el manejo sustentable de sus lugares en el largo plazo.

  3. Chile: un mercado potencial para tapones de corcho natural español

    OpenAIRE

    Cabruja Avendaño, Maitane; Jang, Soocheol; Núñez Sánchez, Marta; Ramírez Bravo, Pía; Sanchis Sierra, M. Amparo

    2008-01-01

    Desarrollo del proyecto de comercio exterior sobre exportación de España a Chile de tapones de corcho para vino con la finalidad de promover el uso del tapón de corcho de alta calidad en la industria vitivinícola. Se constituyo la empresa Corchivex, S.L., como empresa que se dedica a la comercialización y distribución de tapones de corcho natural originarios de España, cuyas operaciones se basan en la exportación de tapones de corcho a países como Chile y Argentina.

  4. Relaciones estructura-función de la proteína SP-C del surfactante pulmonar: efectos sobre la estructura de membranas y papel del colesterol

    OpenAIRE

    Roldán López, Nuria

    2017-01-01

    La función respiratoria depende del establecimiento de una interfase aire-líquido que tiene lugar en los alveolos pulmonares. La estabilización de dicha interfase requiere la presencia de un complejo lipoproteico que es sintetizado y secretado por las células epiteliales alveolares de tipo II, también llamadas neumocitos tipo II. Este material se denomina surfactante pulmonar y sus funciones principales implican la estabilización de los alveolos a lo largo de los ciclos respiratorios, así com...

  5. Alimentação natural para cães e gatos Natural foods for dogs and cats

    Directory of Open Access Journals (Sweden)

    Flávia Maria de Oliveira Borges Saad

    2010-07-01

    Full Text Available Um grande "recall" de alimentos PET ocorrido em 2007 nos Estados Unidos devido à contaminação fraudulenta por melamina, foi ponto chave para o interesse atual sobre novas alternativas alimentares para cães e gatos, a parte a rações comerciais convencionais. A procura por novidades no setor pet food, combinada com uma tendência permanente de humanização na indústria pet, acarreta aumento da procura por alimentos diferenciados para animais de estimação. Dentre os tipos de dietas alternativas encontram-se as dietas naturais, as orgânicas, entre outras. Entretanto, não existem orientações específicas para a fabricação e rotulagem de produtos que contenham carne crua, o que poderia ocasionar desequilíbrios e risco à saúde de proprietários que fornecem esse tipo de alimentação a seus animais de estimação. Por outro lado, os alimentos naturais podem ser constituídos por ingredientes destinados à alimentação humana, buscando uma aproximação da composição dos alimentos que os animais (cães e gatos obtinham da natureza, com maior contribuição dos nutrientes, como proteína e lipídeos, a esses animais. Os efeitos que estes podem causar em animais de estimação são diversos, desde parâmetros relacionados ao surgimento de doenças, por afetarem o metabolismo de proteínas, carboidratos e/ou lipídeos, até fatores ligados à qualidade fecal e, mais além, na questão da segurança alimentar. Assim, os alimentos comerciais naturais são nichos de mercado potenciais e surgiram para atender a demanda de proprietários cada vez mais exigentes com relação à alimentação e nutrição de seus animais de companhia. Entretanto, é importante uma avaliação criteriosa e científica deste nicho de mercado, buscando estabelecer suas vantagens e desvantagens sob o ponto de vista nutricional e de segurança alimentar.A major pet food recall occurred in 2007 in the United States due to fraudulent contamination with melamine

  6. Key to Nature: Herramientas digitales para la enseñanza de biodiversidad

    Directory of Open Access Journals (Sweden)

    Castroviejo Bolíbar, Santiago

    2009-06-01

    Full Text Available Key to Nature is a European project that aims to implement digital tools for teaching biodiversity. It involves 14 public and private institutions from 11 European countries, performing different roles, like providing data (Botanical Garden of Madrid, Natural History Museum of London among others, and offering the latest innovations on e-learning (Centre for Usability Research, University of Leuven, Giunti Labs, Italy... The project, with a 4,8 millions budget half of which is financed by the European Community, lasts three years, the first one just through.Key to Nature es un proyecto europeo que tiene como objetivo la implementación de herramientas digitales para la enseñanza de la biodiversidad. Participan en él 14 instituciones públicas y privadas de 11 países europeos, representando diferentes roles, como proveer datos (Real Jardín Botánico de Madrid, Museo de Historia Natural de Londres entre otros, y ofrecer las últimas innovaciones en aprendizaje digital (Centro de Investigación de “Usabilidad” de la Universidad de Lovaina, Bélgica, Giunti Labs, Italia.... El proyecto, de 4,8 millones de presupuesto de los cuales la mitad los financia la Comunidad Europea, tiene una duración de tres años y se encuentra ahora concluyendo el primero.

  7. Síntese do polipirrol com surfactantes aniônicos visando aplicações como absorvedores de micro-ondas

    Directory of Open Access Journals (Sweden)

    Regiane Aparecida Medeiros Campos

    2014-06-01

    Full Text Available Neste trabalho diferentes amostras de polipirrol (PPi foram sintetizadas variando a combinação dos oxidantes FeCl3 e Fe2(SO43 e dos surfactantes docecilbenzenosulfonato de sódio (DBSNa e ácido dodecilbenzenosulfônico (DBSA. Análises por espectroscopia na região do infravermelho não apresentam diferenças significativas na estrutura química das amostras de PPi sintetizadas. No entanto, análises termogravimétricas, de condutividade elétrica e de difração de raios X mostram que os surfactantes aniônicos favorecem a obtenção de amostras mais estáveis termicamente, condutoras e ordenadas cristalograficamente. Medidas de refletividade de blendas de PPi com resina epóxi, na faixa de 8 a 12 GHz, mostram valores de atenuação de micro-ondas de até 95% da radiação incidente.

  8. Characterization of alkaline lipase from Fusarium oxysporum and the effect of different surfactants and detergents on the enzyme activity Caracterização de lipase alcalina de Fusarium oxysporum e o efeito de diferentes surfactantes e detergentes sobre a atividade enzimática

    Directory of Open Access Journals (Sweden)

    Janaina Nicanuzia dos Prazeres

    2006-12-01

    Full Text Available Nowadays, there is a tendency of use of low temperature in laundry cleaning for both environmental and economical reasons, which makes the use of enzymes in detergent products indispensable. Since lipases are efficient catalyst both in solution and at the water-liquid interface, they are potentially suitable for lipid stain removal applications in industrial laundry and household detergents. The effect of different commercial detergents and surfactants on enzymatic activity of lipase from Fusarium oxysporum was observed through p-nitrophenylpalmitate (pNPP assay. The enzyme was compatible with various ionic and non-ionic surfactants as well as commercial detergents. Lipase activity was strongly inhibited by Sodium Dodecyl Sulphate (SDS, but not by Triton X-100 and Triton X-114. The best assay conditions observed for this lipase were pH 8.0 and 50ºC. The enzyme was stable at alkaline pH and remained 93% of residual activity during 1 h incubation at 60ºC. The highest lipase activity was measured with triglycerides of middle and long chain fatty acids (C8-C18. This enzyme showed a variable specifity/hydrolytic activity towards various fats and oils. All these properties and its resistance towards various surfactants and tolerance to commercial detergents make this lipase a potential additive for detergent formulation.Atualmente, há uma tendência de utilizar baixas temperaturas em limpeza de lavanderia por razões ambientais e econômicas, situações estas que tornam indispensáveis o uso de enzimas em produtos detergentes. Devido às lipases serem excelentes catalisadoras em soluções e em interface água-óleo, elas são potencialmente apropriadas para aplicação na remoção de manchas de gorduras em lavanderia industrial e detergentes domésticos. O efeito de diferentes detergentes comerciais e surfactantes sobre a atividade enzimática da lipase de Fusarium oxysporum foi observado através de ensaios com p-nitrofenilpalmitato (pNPP. A

  9. La polisemia: fuente natural de actividades para las clases de español

    Directory of Open Access Journals (Sweden)

    Marta Wicherek

    2016-11-01

    Full Text Available El objetivo que nos proponemos en este estudio será el de presentar el fenómeno de la polisemia desde el punto de vista de la didáctica de las lenguas extranjeras. El análisis de voces polisémicas y el hecho de que el número de sentidos de una lexía en una lengua determinada rara vez sea igual a la cantidad de sentidos del vocablo equivalente en otra lengua, puede ofrecer al profesor una oportunidad para introducir, de manera sencilla y natural, actividades para profundizar en esta cuestión. El detectar diferencias de esta índole -que aparecen en distintos registros y en todos los niveles- puede dar pie a que los alumnos se percaten de la inexactitud semántica entre las lenguas que emplean, lo cual influye positivamente en su proceso de aprendizaje y potencialmente contribuirá a incrementar el interés de estos por la lengua que desean aprender.   Palabras clave: polisemia, palabras polisémicas, contenido semántico, contexto lingüístico.   Polysemy: natural source of activities for Spanish classes   Abstact: Our objective with this study is to present the phenomenon of polysemy from the point of view of foreign language teaching. The analysis of polysemous words and the fact that the number of meanings of a word in a certain language is hardly ever the same as the amount of meanings of an equivalent word in another can offer the teacher the chance to simply and naturally introduce activities to delve deeper into this matter. Detecting differences of this sort which appear in different settings and at all levels allows students to discover the semantic inaccuracy between languages that they use which positively influences students’ learning process and helps increase their interest in the language they aim to learn.   Keywords: polysemy, polysemous words, semantic contents, linguistic context.

  10. Filmes compostos de gelatina, triacetina, ácido esteárico ou capróico: efeito do pH e da adição de surfactantes sobre a funcionalidade dos filmes Composite films made with gelatin, tracetin, stearic and caproic acids: effect of pH and surfactants addition on the functionality of films

    Directory of Open Access Journals (Sweden)

    Taciana Davanço

    2007-06-01

    Full Text Available O desenvolvimento de biofilmes tem crescido devido à possibilidade de substituição parcial de materiais plásticos não biodegradáveis. Proteínas e polissacarídeos têm sido utilizados para a produção de filmes com boas propriedades mecânicas. Porém, filmes a partir desses materiais apresentam alta permeabilidade ao vapor de água. Uma alternativa usada para diminuir a permeabilidade ao vapor de água dos filmes é a incorporação de substâncias hidrofóbicas na composição da solução filmogênica, porém essa incorporação não ocorre de maneira homogênea. Com o objetivo de melhorar a incorporação das substâncias hidrofóbicas (ácido esteárico e ácido capróico na matriz protéica (gelatina do filme foram adicionados os surfactantes (SDS e Tween 80, que são substâncias capazes de interagir com a proteína e com o ácido graxo, tornando a matriz filmogênica menos heterogênea. O efeito do pH também foi estudado, com a finalidade de observar se este exerce influência na homogeneidade da matriz filmogênica. A adição do ácido esteárico aos filmes de gelatina foi mais eficiente na redução da permeabilidade ao vapor de água do que o ácido capróico. A adição do surfactante SDS reduziu a permeabilidade ao vapor de água dos filmes contendo ácido esteárico, ou ácido capróico. O ajuste de pH nos filmes sem adição de surfactantes também produziu matrizes mais homogêneas.The development of biofilms has grown considering the possibility of partial substitution of plastic materials which are not biodegradable. Proteins and polysaccharides have been used to produce films with good mechanical properties. However, films produced with these materials present a high permeability in water vapor. An alternative to improve the water vapor barrier of films is to incorporate hydrophobic substances (stearic and caproic fatty acids in the composition of the filmogenic solution, however this incorporation does not occur

  11. Determinación de restricciones y posibilidades ambientales para la expansion del transporte de gas natural en Colombia

    Directory of Open Access Journals (Sweden)

    Ángel Sanint Enrique

    2011-11-01

    Full Text Available En la línea de la Evaluación Ambiental Estratégica, EAE, se desarrolló un método para la determinación de restricciones y posibilidades ambientales en proyectos de transporte de gas natural por ductos, basado en el uso de herramientas de análisis territorial aplicadas sobre la plataforma SIG (Sistema de Información Geográfica, incorporando criterios ambientales que a escala 1:500.000 apoyarán la toma de decisiones en el nivel de planeación y propiciarán la elaboración del plan de expansión para el transporte de gas natural en Colombia. Para esto, se definió el concepto de ambiente a partir de un Modelo Analítico preexistente; se delimitó un área con posibilidades para la expansión de la red de transporte de gas natural incorporando nuevos trazados; se seleccionaron las variables y factores que complementaban el Modelo Analítico; se definió la estructura de preferencias a partir de una encuesta a expertos; se determinaron las restricciones nacionales y se construyeron superficies numéricas síntesis de critici dad ambiental para cada dimensión. Como resultado, se obtuvieron 5 superficies síntesis, una por cada dimensión, y una superficie final para Colombia, con restricciones y posibilidades ambientales. Además se propusieron análisis complementarios para establecer prioridades en la gestión ambiental.

  12. natural

    Directory of Open Access Journals (Sweden)

    Elías Gómez Macías

    2006-01-01

    Full Text Available Partiendo de óxido de magnesio comercial se preparó una suspensión acuosa, la cual se secó y calcinó para conferirle estabilidad térmica. El material, tanto fresco como usado, se caracterizó mediante DRX, área superficial BET y SEM-EPMA. El catalizador mostró una matriz de MgO tipo periclasa con CaO en la superficie. Las pruebas de actividad catalítica se efectuaron en lecho fijo empacado con partículas obtenidas mediante prensado, trituración y clasificación del material. El flujo de reactivos consistió en mezclas gas natural-aire por debajo del límite inferior de inflamabilidad. Para diferentes flujos y temperaturas de entrada de la mezcla reactiva, se midieron las concentraciones de CH4, CO2 y CO en los gases de combustión con un analizador de gases tipo infrarrojo no dispersivo (NDIR. Para alcanzar conversión total de metano se requirió aumentar la temperatura de entrada al lecho a medida que se incrementó el flujo de gases reaccionantes. Los resultados obtenidos permiten desarrollar un sistema de combustión catalítica de bajo costo con un material térmicamente estable, que promueva la alta eficiencia en la combustión de gas natural y elimine los problemas de estabilidad, seguridad y de impacto ambiental negativo inherentes a los procesos de combustión térmica convencional.

  13. Interacción Natural Basada en un Conjunto Mínimo de Sensores Inerciales para Realidad Virtual sin Cables

    OpenAIRE

    De la Rubia Cuestas, Ernesto Jesús

    2014-01-01

    La Realidad Virtual tiene un enorme potencial aún por explotar. Esta tesis doctoral pretende ir un paso más allá en el desarrollo de sistemas de Realidad Virtual inmersivos. En concreto, su objetivo fundamental es diseñar, desarrollar y evaluar una plataforma experimental sin cables para investigación en Realidad Virtual inmersiva con navegación natural e interacción manual basada en un conjunto mínimo de sensores inerciales. Para ello se emplea metodología científica desde la perspectiva de ...

  14. Logistical management system for natural gas distribution; Sistema de gestao logistica para a distribuicao de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Arruda, Joao Bosco F.; Nobre Junior, Ernesto F.; Praca, Eduardo R. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Nucleo de Pesquisa em Logistica, Transportes e Desenvolvimento

    2004-07-01

    The Brazilian Federal Government has the very purpose of increasing the participation of the Natural Gas in the primary energy internal supply from 7,5% nowadays to about 12% till 2010. However, for that, it is necessary to eliminate the great impedance represented by the restricted accessibility to the product, due to the high distribution costs involved. So, there is an urgent need for availability of technologies to help natural gas distribution systems. This paper proposes an innovative logistics-based approach on the subject of the natural gas distribution, through a computational tool (GASLOG System) to be applied in the North and Northeastern urban and country areas of Brazil, with initial case study in the city of Fortaleza. In its conception, the GASLOG System focuses on the point-of-view of everyone of the actors involved with the natural gas distribution process trying to respond their particular necessities in the sector. (author)

  15. Use of natural gas for electric power generation in Amazonia, Brazil; Utilizacao do gas natural para geracao de energia eletrica na Amazonia

    Energy Technology Data Exchange (ETDEWEB)

    Mendes, Mauro R. da C.; Cavalcante, Judas T.M.; Silva, Luiz Clovis P. da; Souza, Cleomar F. de; Pampolha, Humberto; Mannarino, Ronaldo; Sampaio, Wander [PETROBRAS, Manaus, AM (Brazil)

    2000-07-01

    The Amazon Region is the largest Brazilian region, covers an area of 4,9 millions Km{sup 2} in nine states (Para, Amapa, Amazonas, Acre, Rondonia, Roraima, Mato Grosso, Maranhao and Tocantins) and 18.9 millions of inhabitants, concentrated in the capitals. The average electric energy consumption expected in 2000 is 22,173 Gwh, part of this generated in diesel thermoelectric plants. Considering that the Amazon Region have the second biggest natural gas reserve in Brazil, with almost 124.5 billion m{sup 3}, a project is being developed to use natural gas to generate electricity in the thermoelectric plants. The natural gas is considered better than other fuels because it is clean, cheaper and available in the Amazon sedimentary basins. (author)

  16. Expert System for support of natural gas network management; Sistema especialista para gerenciamento de redes de gas natural: SEGRED

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jonny Carlos da [Universidade Federal de Santa Catarina (UFSC), Florianopolis, SC (Brazil); Hirano, Eduardo Wulff [Universidade Federal de Santa Catarina (UFSC), Florianopolis, SC (Brazil). Lab. de Hidraulica e Pneumatica (LASHIP); Moura, Newton Reis de [PETROBRAS, Rio de Janeiro, RJ (Brazil); Freire, Luiz Gustavo de Melo [PETROBRAS S.A., Pojuca, BA (Brazil). Unidade de Negocios de Gas Natural (UNGN)

    2004-07-01

    This work reports on the SEGRED project, which aims to develop an expert system for management of natural gas transportation networks. The system is currently being developed by LASHIP-UFSC in partnership with PETROBRAS/CENPES and TBG. The SEGRED system consists of an environment designed to support natural gas pipeline management by means of remote supervision of process parameters and analysis of the mutual interactions of those parameters by an expert system integrated to a dynamic simulator. The system is deployed through a process that contributes to making available for use the knowledge about functions such as line packing analysis and line break detection, thus enhancing the quality of execution of these tasks, which are related to the management of natural gas transportation network. The main benefits consist of promoting efforts to acquire and organize expert knowledge. This process contributes to the generation of a knowledge base with corporate technical memory, which can be made available in a permanent, expansible and useful way for decision-making. (author)

  17. Technological development for increasing the natural gas market; Desenvolvimento tecnologico para o incremento do mercado do gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Bollmann, Arno; Romanos, Rafael Reami; Konishi, Ricardo; Lehmkuhl, Willian Anderson [Companhia de Gas de Santa Catarina (SCGAS), Florianopolis, SC (Brazil)

    2008-07-01

    This paper presents the results achieved in technological development projects for the use of natural gas in furnaces for producing ceramic frits, in plastic film thermoforming and in hardwoods drying. In the case of the production of frits, the analysis of a typical furnace showed that its productivity is better, compared with the use of conventional fuel oil and around 60% of losses of energy were detected, resulting in a proposal of a new model to increase its efficiency, recovering the energy of exhaust gases from the chimney. For the thermoforming, it was shown that the isolation of its sides enable improvements in the order of 7% in its efficiency. Comparing the operating costs, the replacement of electric radiators by porous radiating burners generates savings of around 30% to 45%, with an expected return on investment in about 2.5 years. The drying of hardwoods with natural gas can be carried out in only 26 days, kept all the required technical characteristics, thanks to the good controllability of the conditions of the drying heater, providing a technologically feasible opportunity to reduce the drying time, which in conventional methods is in the order of 90 to 120 days. (author)

  18. Expert System for natural gas transportation network management; Sistema especialista para gerenciamento de redes de transporte de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jonny Carlos da; Porciuncula, Gilson Simoes [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Engenharia Mecanica Lab. de Sistemas Hidraulicos e Pneumaticos

    2003-07-01

    This paper presents a project to integrate expert system and dynamic simulation of natural gas transportation network applying the concept of agents. Natural gas pipeline operation requires the intermittent analysis of hundreds interrelated operational parameters, which represent the network state. The combination of expert system and dynamic simulation is a synergic solution for this kind of problem. With expert system techniques, it is possible to implement rules that describe the relationship between current operational parameters and the network normal operational conditions based on heuristic knowledge. By applying such rules, the system aims to evaluate the real network state and to predict abnormal conditions via dynamic simulation, allowing time analysis of operational situation in advance. At the current stage, the project presents a well defined model. The process of knowledge acquisition and representation has taken place following an incremental approach, considered as development paradigm. The project objectives are to reduce costs, increase the reliability and organize pipeline operation and maintenance information. This work is part of SEGRED project established as partnership among LASHIP/UFSC, SCGAS, TBG and PETROBRAS. The project also received support from FINEP. (author)

  19. IDENTIFICACIÓN DE CRITERIOS PARA LA SELECCIÓN NATURAL DE RNA MENSAJEROS

    Directory of Open Access Journals (Sweden)

    J. González

    2005-12-01

    Full Text Available Para el estudio de la evolución biológica, se debió que establecer una correspondencia entre dos polímeros, que permitiera el entendimiento de cómo la información almacenada en los ácidos nucleicos daba lugar a proteínas específicas. Actualmente se sabe que las tripletas del código genético de mRNA establecen la correspondencia entre los polímeros y que la función de traducción es realizada por el tRNA asociado al ribosoma; sin embargo, el mecanismo por el cual una “frase” del “lenguaje” del código de los nucleótidos es escogido entre todos los arreglos posibles, para ser traducido es aún desconocido. El presente estudio asume que debido a la naturaleza de transferencia de información del proceso de codificación es posible que uno de los parámetros con los que se han caracterizado dichos fenómenos sea relevante para la selección. De esta forma se generará un modelo teórico que permita seleccionar entre una serie de factores de la teoría de información calculados in silico y estimación de algunos parámetros fisicoquímicos para el conjunto de todas las secuencias de nucleotídicas de mRNA probabilísticamente posibles, es decir, todas aquellas derivadas de las combinaciones entre los codones de los aminoácidos presentes en la secuencia de una proteína en particular, permitirá identificar el o los que regulan que sólo una de esas secuencias de mRNA sea la traducida en la naturaleza.

  20. Methodologies for the calculation of relative efficiency: description and application for natural gas distributors in Latin America; Metodologias para el calculo de eficiencia relativa: descripcion y aplicacion para distribuidores de gas natural en Latinoamerica

    Energy Technology Data Exchange (ETDEWEB)

    Escandon Jimenez, Alejandro C. [Mexico, D.F. (Mexico)

    2004-06-15

    The importance of knowing the performance of the companies within a productive sector has increased in the last years, demonstrating the necessity of knowing and applying tools that help us to know the performance of a company with respect to the others with which it is competing. Recently, a great variety of tools have been developed to know the efficiency or productivity of a company in a certain sector. Nevertheless, the two more used, up to now, are those that will be described in the present in study. Finally, one practical example of the two methodologies will be presented, applied to the natural gas industry for distributing companies of this energy in Latin America. [Spanish] La importancia de conocer el desempeno de las empresas dentro de un sector productivo ha incrementado en los ultimos anos, demostrando la necesidad de conocer y aplicar herramientas que nos ayuden a conocer el desempeno de una empresa con respecto a las demas con las cuales se esta compitiendo. Recientemente, se han desarrollado gran variedad de herramientas para conocer la eficiencia o productividad de una compania en un determinado sector. Sin embargo, las dos mas utilizadas, hasta el momento, son las que se describiran en el presente estudio. Finalmente, se presentara un ejemplo practico de las dos metodologias, aplicado a la industria del gas natural para companias distribuidoras de este energetico en Latinoamerica.

  1. Genetic characterization of Trypanosoma cruzi natural clones from the state of Paraíba, Brazil

    Directory of Open Access Journals (Sweden)

    Christian Barnabé

    2005-05-01

    Full Text Available Eighteen Trypanosoma cruzi stocks from the state of Paraíba, Brazil, isolated from man, wild mammals, and triatomine bugs were studied by multilocus enzyme electrophoresis and random primed amplified polymorphic DNA. Despite the low number of stocks, a notable genetic, genotypic, and phylogenetic diversity was recorded. The presence of the two main phylogenetic subdivisions, T. cruzi I and II, was recorded. The strong linkage disequilibrium observed in the population under survey suggests that T. cruzi undergoes predominant clonal evolution in this area too, although this result should be confirmed by a broader sample. The pattern of clonal variation does not suggests a recent origin by founder effect with a limited number of different genotypes.

  2. Biofilmes de gelatina: Efeito da adição de surfactante e ácidos graxos de óleo de coco na permeabilidade ao vapor de água

    OpenAIRE

    Thiago Azevedo de Oliveira; Ricardo Henrique de Lima Leite; Edna Maria Mendes Aroucha; Delânnia Maia Nobre; Francisco Klebson Gomes dos Santos

    2012-01-01

    O presente trabalho teve por objetivo avaliar o efeito da adição de surfactante tween 20 e ácidos graxos de óleo de coco na permeabilidade ao vapor de água de biofilmes de gelatina. O experimental foi realizado em delineamento inteiramente casualizados (DIC), disposto em esquema fatorial 2 x 5, com 3 repetições, em que o primeiro fator corresponde ao dos tratamentos com tween 20 e ácidos graxos de óleo de coco, e o segundo termo corresponde a concentração (0%, 12.5%, 25%, 37.5% e 50%) em rela...

  3. O Escudo Guianês: um patrimônio natural para preservar

    Directory of Open Access Journals (Sweden)

    Rubens da Silva Ferreira

    2016-01-01

    Full Text Available The work reflects on the Guiana Shield as natural heritage to be preserved in a process driven by international cooperation between Brazil, Colombia, French Guiana, Guyana, Suriname and Venezuela in the protecting of a transboundery property. Among other possibilities, a proposed action in this direction is given by the creation of Conservation Units (CU for inclusion in the World Heritage List of the United Nations Educa‑tional, Scientific and Cultural Organization (UNESCO.

  4. Método para avaliação e pesquisa da atividade antimicrobiana de produtos de origem natural

    Directory of Open Access Journals (Sweden)

    Janaina F. Packer

    Full Text Available As exigências do mercado consumidor induzem a indústria cosmética a formular produtos seguros cada vez menos agressivos e naturais. Durante a formulação para tais apelos a dificuldade maior encontra-se em conservar o produto final. Com este objetivo avaliamos os óleos: de copaíba, alecrim, melaleuca, alho, andiroba; própolis, e dois ingredientes de origem natural: um ingrediente multifuncional extraído de folhas de oliva e o farnesol que estão disponíveis e são fornecidos à indústria cosmética, com a finalidade de comprovar a ação dos mesmos. O método de escolha foi o de ágar em placa com orifício modificado. As cepas selecionadas foram Staphylococcus aureus (ATCC 6538, Escherichia coli (ATCC 8739, Pseudomonas aeruginosa (ATCC 9027 e Candida albicans (ATCC 10231. Dentre as amostras analisadas os melhores resultados foram obtidos com os óleos de melaleuca e alecrim que apresentaram atividade bacteriostática e fungistática para as quatro cepas em questão.

  5. Notas acerca del movimiento natural de la población para el estudio de la salud perinatal

    Directory of Open Access Journals (Sweden)

    Sol Pía Juárez

    2014-11-01

    Full Text Available El movimiento natural de la población, publicado por el Instituto Nacional de Estadística (INE, constituye una fuente de enorme importancia para el estudio de la salud perinatal en el ámbito nacional. Sin embargo, se desconocen las características de la recogida de la información que afectan a la calidad y la interpretación de los estudios epidemiológicos que utilizan esta fuente. El objetivo de este estudio es dar a conocer cómo se recoge la información y algunos problemas asociados. Este trabajo es el resultado de un análisis de las notas metodológicas del INE y de la información recogida de primera mano en hospitales de Madrid, en el Registro Civil central de Madrid y en el Instituto de Estadística de Madrid (IEM. Es necesaria una mayor integración entre las instituciones involucradas para mejorar la calidad de las estadísticas de nacimientos y muertes fetales tardías.

  6. Natural Mexican zeolite, potential material for hydrogen storage; Zeolita natural mexicana, material para su posible uso en el almacenamiento de hidrogeno

    Energy Technology Data Exchange (ETDEWEB)

    Iturbe-Garcia, J. L.; Lopez Munoz, B. E. [Instituto Nacional de Investigaciones Nucleares (Mexico)]. E-mail: joseluis.iturbe@inin.gob.mx

    2009-09-15

    This work presents a study of the use of natural Mexican zeolite as a possible alternative for hydrogen storage. This zeolite material is from the state of Sonora. Its particle size was decreased using a grinding treatment with a mechanical alloying system for 5 hours. The mechanical alloying equipment was built in our Institute (Instituto Nacional de Investigaciones Nucleares, ININ). Later, zeolite in powder form was characterized with x-ray diffraction and sweep electron microscopy. It was heated in a micro-reactor at 350 degrees Celsius, which was simultaneously emptied over 2 hours to eliminate humidity and possible gases trapped in its structure. Next, the temperature was reduce to 10 degrees Celsius and it was placed in contact with ultra-high pure hydrogen at a pressure of 10 bars for 10 minutes. The analysis of hydrogen trapped in the zeolite was conducted with gas chromatography. The results of the chromatograms indicate that the zeolite absorbed and liberated the hydrogen in completely different conditions than those reported in the literature. That is, with our experimental conditions at low pressure and temperature, the hydrogen was absorbed in this type of material. [Spanish] En este trabajo se presenta un estudio sobre el uso de una zeolita natural de origen mexicano como posible alternativa para almacenar hidrogeno. Este material zeolitico procede del Estado de Sonora, al cual se le disminuyo el tamano de particula mediante un tratamiento de molienda con un sistema de aleado mecanico durante 5 horas. El equipo de aleado mecanico se construyo en nuestro Instituto (Instituto Nacional de Investigaciones Nucleares, ININ). Posteriormente, la zeolita en forma de polvo se caracterizo por medio de difraccion de rayos X y microscopia electronica de barrido. Se sometio a calentamiento en un micro-reactor a 350 grados Celsios y al mismo tiempo haciendo vacio durante 2 horas, para eliminar humedad y posibles gases que estuvieran atrapados en su estructura. En

  7. Concepto de Área Natural Turística como aporte teórico para la planificación sustentable del Turismo

    Directory of Open Access Journals (Sweden)

    Juan Manuel Andrés

    2008-01-01

    Full Text Available El presente trabajo surge a partir de la investigación para la tesis de grado "El área natural y el turismo - Elaboración de un concepto de área natural como aporte para la planificación del turismo y la recreación en espacios naturales". Dado que el modo en que se entienda la realidad será determinante del tipo de planificación y accionar que se tenga sobre la misma, se ve la necesidad de resignificar el concepto de área natural turística. Contribuir a su entendimiento y a la búsqueda de un vocabulario homogéneo para los actores intervinientes, es de importancia para introducir racionalidad y coherencia al uso. Para ello se definieron dos momentos metodológicos, uno de revisión documental, durante el cual se procedió a la búsqueda de información secundaria bibliográfica, y otro de revisión de experiencias a partir de entrevistas a informantes clave regionales y nacionales. El resultado fue una redefinicion del Área Natural Turística (ANT como un aporte conceptual a la planificación del turismo.

  8. Estimando a taxa de juros natural para o Brasil: uma aplicação da metodologia VAR estrutural

    Directory of Open Access Journals (Sweden)

    Bráulio Lima Borges

    2006-03-01

    Full Text Available Utilizando a metodologia VAR estrutural, estimamos a série mensal da taxa de juros natural brasileira, definida como sendo a taxa de juros real, que, quando vigente, mantém a inflação constante. Em um regime de metas de inflação, o conhecimento desta variável é importante para o Banco Central na determinação da trajetória de seu instrumento de política monetária. Verificamos que a taxa de juros real vigente no período que se estende de setembro de 2000 até dezembro de 2003 apresenta-se sistematicamente superior àquela e mais volátil. Com base em tal constatação, analisamos a qualidade da política monetária adotada no mesmo período.Using a structural VAR model, we estimate the historical series of the Brazilian natural rate of interest, defined as the real interest rate that, when set, keeps inflation steady. In an inflation-targeting regime, the knowledge of this variable is critical to the Central Bank in order to define the path of his monetary policy instrument. We verify that the real interest rate practiced in Brazil in the period between September 2000 until December 2003 was systematically higher and more volatile than the natural rate. Based in this last fact, we analyze the stance of monetary policy in that period.

  9. Dyes adsorption blue vegetable and blue watercolor by natural zeolites modified with surfactants;Adsorcion de colorantes azul vegetal y azul acuarela por zeolitas naturales modificadas con surfactantes

    Energy Technology Data Exchange (ETDEWEB)

    Jardon S, C. C.; Olguin G, M. T. [ININ, Departamento de Quimica, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Diaz N, M. C., E-mail: teresa.olguin@inin.gob.m [Instituto Tecnologico de Toluca, Av. Instituto Tecnologico s/n, Ex-Rancho la Virgen, 52140 Metepec, Estado de Mexico (Mexico)

    2009-07-01

    In this work was carried out the dyes removal blue vegetable and blue watercolor of aqueous solutions, to 20 C, at different times and using a zeolite mineral of Parral (Chihuahua, Mexico) modified with hexadecyl trimethyl ammonium bromide or dodecyl trimethyl ammonium bromide. The zeolite was characterized before and after of its adaptation with NaCl and later with HDTMABr and DTMABr. For the materials characterization were used the scanning electron microscopy of high vacuum; elementary microanalysis by X-ray spectroscopy of dispersed energy and X-ray diffraction techniques. It was found that the surfactant type absorbed in the zeolite material influences on the adsorption process of the blue dye. Likewise, the chemical structure between the vegetable blue dye and the blue watercolor, determines the efficiency of the color removal of the water, by the zeolites modified with the surfactants. (Author)

  10. A CONTRIBUIÇÃO DE ELIO FAZZALARI PARA A [CORRETA] COMPREENSÃO DO JUIZ NATURAL NO ÂMBITO DO PROCESSO ADMINISTRATIVO DISCIPLINAR

    OpenAIRE

    Staffen, Marcio Ricardo; Universidade do Vale o Itajaí; Morais da Rosa, Alexandre; Universidade Federal de Santa Catarina

    2012-01-01

    O presente artigo busca trabalhar sinteticamente a contribuição de Elio Fazzalari para a [correta] compreensão do princípio do juiz natural na órbita do processo administrativo disciplinar. É esta a temática deste estudo que se inicia com um levantamento histórico acerca das origens da figura do juiz natural e seu desenvolvimento nos sistemas jurídicos globais. Com base nas orientações doutrinárias se analisa o conceito, a finalidade e a incidência do juiz natural na esfera do processo admini...

  11. Concepto de Área Natural Turística como aporte teórico para la planificación sustentable del Turismo

    OpenAIRE

    Juan Manuel Andrés; Matilde Elisabeth Encabo

    2008-01-01

    El presente trabajo surge a partir de la investigación para la tesis de grado "El área natural y el turismo - Elaboración de un concepto de área natural como aporte para la planificación del turismo y la recreación en espacios naturales". Dado que el modo en que se entienda la realidad será determinante del tipo de planificación y accionar que se tenga sobre la misma, se ve la necesidad de resignificar el concepto de área natural turística. Contribuir a su entendimiento y a la búsqueda de un ...

  12. Processamento de linguagem natural para indexação automática semântico-ontológica

    OpenAIRE

    Câmara Júnior, Auto Tavares da

    2013-01-01

    A pesquisa propõe uma arquitetura de indexação automática de documentos utilizando mecanismos de processamento de linguagem natural em nível semântico. Por meio do arranjo de ferramentas e recursos existentes, agregado ao desenvolvimento de software para integração, é construído um sistema de indexação automática que utiliza conhecimento modelado em uma ontologia para análise semântica. A aplicação da arquitetura é exemplificada e posta à prova em um conjunto de laudos periciais de crimes ...

  13. Evaluación de modelos de turbulencia para predecir los flujos de masa de aire interzonas a través de una abertura de escalera para la convección natural y mixta en los edificios

    Directory of Open Access Journals (Sweden)

    Sergio Vera

    2015-08-01

    Full Text Available El objetivo principal del diseño de edificios es el proveer ambientes interiores productivos, confortables y saludables para sus ocupantes en balance con la eficiencia energética. Aberturas interiores de edificios, tales como las de escaleras, son huellas importantes para el intercambio de calor, aire, humedad y contaminantes. Los flujos de aire interzonas a través de aberturas horizontales no han sido estudiados profundamente debido a su naturaleza transiente y altamente inestable, la complejidad para realizar experimentos, y la escasez de datos experimentales disponibles. La Dinámica de Fluidos Computacional (CFD por su acrónimo en inglés es una excelente herramienta para avanzar en la comprensión de este fenómeno. En este artículo, se aplica CFD para evaluar el desempeño de cinco modelos de turbulencia de dos ecuaciones: k-ε estándar, k-ε RNG, k-ε realizable, k-ω estándar y k-ω SST, para predecir las condiciones del aire interior y los flujos de la masa de aire ascendente que fluyen a través de una abertura horizontal en una casa de ensayos de dos pisos a escala real. La investigación incluye seis casos con diferentes gradientes de temperatura entre los dos pisos y tres estrategias de ventilación que representan convección natural y mixta. Los principales resultados muestran que las temperaturas son predichas correctamente por todos los modelos de turbulencia, mientras que las velocidades del aire simuladas presentan variaciones mayores entre los modelos de turbulencia evaluados. En general, los modelos k-s estándar y k-ε realizable son los más precisos para predecir las temperaturas interiores y las velocidades de aire para la convección natural y mixta, respectivamente. Además, los flujos de la masa de aire ascendente a través de la abertura horizontal estimados por ambos modelos de turbulencia concuerdan muy bien con los datos experimentales.

  14. A problemática dos resíduos em sistemas gelificados para a limpeza de pinturas

    Directory of Open Access Journals (Sweden)

    Teresa Moreira Braga Teves Reis

    2012-12-01

    Full Text Available A limpeza de superfícies pictóricas com sistemas gelificados tem vindo a levantar diversas questões e opiniões contraditórias que se prendem com a deposição de resíduos de alguns componentes dos géis, nomeadamente os surfactantes, nas superfícies tratadas, e com potenciais riscos que ditos sistemas gelificados podem apresentar para os materiais constituintes das pinturas. Propôs-se neste artigo fazer uma revisão generalizada da informação já publicada acerca dos resíduos de géis, numa tentativa de informar outros colegas da profissão acerca deste assunto e assim fomentar tomadas de decisões mais esclarecidas relativamente a uma das operações que mais riscos apresenta para uma pintura: a sua limpeza.

  15. Elementos para la evaluación eficaz de productos naturales con posibles efectos antihipertensivos Elements for the effective evaluation of natural products with possible antihypertensive effects

    Directory of Open Access Journals (Sweden)

    Mario Francisco Guerrero

    2009-12-01

    Full Text Available Desde el contexto de la farmacología experimental, en este ensayo se discuten algunos criterios que pueden ser útiles para estimar el potencial de productos naturales con posible actividad farmacológica para el tratamiento de la hipertensión, una de las enfermedades de mayor impacto epidemiológico en Colombia y en el mundo. Se acude para ello al análisis de algunas pruebas farmacológicas accesibles en nuestro medio: modelos de hipertensión arterial en la rata de laboratorio, pruebas in vitro e in vivo, y análisis microscópicos, que implementados con los protocolos adecuados y cotejadas en conjunto, pueden arrojar información valiosa a la hora de considerar las perspectivas de un producto natural en el campo de la hipertensión arterial.Within the context of experimental pharmacology, some criteria are discussed for estimating the potential of natural products with possible pharmacological activity for the treatment of hypertension. This disorder has great epidemiological impact in Colombia as well as elsewhere. Discovery of these products can be accomplished by use of accessible pharmacological tests such as the following: developing models of arterial hypertension in the laboratory rat, in vitro tests, in vivo tests and microscopic analysis. Suitable protocols associated with these techniques can capture valuable information about possible effects on hypertension during the evaluation phase of a natural product.

  16. The factors for the competitiveness in the supply of natural gas; Los factores para la competitividad en la oferta del gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Escobar Toledo, Carlos; Aguirre Portillo, Alejandro [Facultad de Quimica, UNAM (Mexico)

    1996-07-01

    The environmental restrictions have caused an increasing demand of natural gas on world-wide scale. In this paper the analysis of the present situation of the natural gas in Mexico and throughout the world is presented, taking into account the structure of the production costs of the natural gas in the reservoirs, as well as the transportation and distribution costs destined to the natural gas consumption in specific markets. It is possible to emphasize that at the moment the transportation of this power source is more expensive than the corresponding one of the crude and of the oil-producing products obtained from oil refinement. [Spanish] Las restricciones medioambientales han provocado una creciente demanda de gas natural a escala mundial. En este trabajo se presenta un analisis de la situacion actual del gas natural en Mexico y en el mundo entero, tomando en cuenta la estructura de los costos de produccion del gas natural en los yacimientos, asi como los costos de transporte y distribucion destinados al consumo de gas natural en mercados especificos. Cabe destacar que actualmente el transporte de esta fuente energetica es mas caro que el correspondiente al crudo y a los productos petroliferos obtenidos de la refinacion de aquel.

  17. The relevance of thermoelectricity for the development of the Brazilian natural gas industry; A importancia da termoeletricidade para o desenvolvimento da industria de gas natural no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Canelas, Andre [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia (COPPE). Programa de Planejamento Energetico]. E-mail: canelas@ppe.ufrj.br

    2004-07-01

    The aim of this paper is to analyse the capacity of the 'inflexible production', by state-owned Brazilian company PETROBRAS at its natural gas-based thermo-electrical generation stations, to promote in a increase in the use of the Brazil- Bolivia Gaspipe (Gasbol), which is the natural gas transport pipe related to 90,66% of the Brazilian natural gas imports. As the contract is a 'take or pay' contract, Brazil ends up paying for such a large volume of gas that the country does not effectively consume, since the consume of natural gas in Brazil has not come to the expectations which were prevailing when the import contract was signed. Last but not least, this article addresses the future possibilities for the increase of the share of natural gas in the total Brazilian energy consumption. (author)

  18. Method for evaluating natural gas demand scenarios (Demangas Project); Metodologia para avaliacao de cenarios de demanda pelo gas natural (Projeto Demangas)

    Energy Technology Data Exchange (ETDEWEB)

    Lindau, Luis Antonio [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Lab. de Sistemas de Transportes; Santos, Gilberto T. dos; Silva, Silvio C. da; Ribeiro, Jose Luis D.; Fogliatto, Flavio S. [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Lab. de Otimizacao de Produtos e Processos

    2004-07-01

    This paper presents the methodology developed for the evaluation of the existing and potential market for natural gas in the industrial, automotive, residential and commercial sectors of Rio Grande do Sul. The methodology is based upon a marketing research framework and consists of the definition of the problem; application of qualitative, quantitative and stated-preference enquiries; review of the state-of-the-art and state-of-the-practice; and, also, interviews with specialists. The methodology is consolidated in four software that enable the simulation of different demand scenarios of natural gas up to the year 2010. The development of this methodology comprised the participation of more than 1,000 potential users of natural gas and allowed the state company in charge of distributing natural gas to: structure the problem of forecasting the consumption of natural gas within a new context of competition in the energy industry; help the formulation of the strategic plan of the company with regard to investment strategies and incrementing the number of clients; and propose marketing efforts to promote the adoption of natural gas as an alternative energy source. (author)

  19. Mercado de gás natural dos setores químicos e termoelétrico para os próximos 10 anos no estado da Bahia

    OpenAIRE

    Garcia, Celestino Bonte

    2006-01-01

    A presente dissertação teve como objetivo estimar o mercado de gás natural no Estado da Bahia para os setores químico e termoelétrico até 2015. Esses dois setores são os mais importantes consumidores de gás natural no Estado. O dimensionamento de gás natural desses dói mercados, âncoras de consumo, contribuirá para identificar as obras estruturantes necessárias para regularizar o suprimento de gás natural para os próximos 10 anos no Estado. Convém ressaltar que o gás natural representa uma fo...

  20. VALORACIÓN LOCAL DEL PATRIMONIO NATURAL PARA EL DESARROLLO TURÍSTICO EN UN TERRITORIO RURAL TRANSFRONTERIZO (SIERRA DEL LAROUCO, GALICIA-NORTE DE PORTUGAL

    Directory of Open Access Journals (Sweden)

    Elena De Uña-Álvarez

    2017-01-01

    Full Text Available En la mayoría de los espacios rurales de montaña la oferta turístico - recreativa está basada en sus recursos naturales. El conocimiento de la percepción y las expectativas de los actores locales respecto a su valor y potencialidad es indispensable para fomentar un turismo sostenible. La Sierra del Larouco es un espacio transfronterizo que se extiende entre el sur de Galicia (N oroeste de España y el norte de Portugal. El objetivo principal de la investigación es conocer la percepción, las ideas y las expectativas de sus actores respecto a los bienes disponibles y su utilización como recursos para el desarrollo local a través de l turismo. Para ello, han sido realizadas 29 entrevistas a partir de un cuestionario - guía . Este trabajo presenta solo una parte de sus resultados en el contexto de un estudio exploratorio : los que expresan el grado de interés y la valoración que otorgan los actores clave al conjunto de recursos disponibles, entre los cuales el patrimonio natural ocupa una posición destacada ; al mismo tiempo, inciden en el potencial que confieren a este patrimonio “propio” como un conjunto de recursos turísticos para favor ecer la mejora del ámbito local.

  1. EL USO DE Moringa oleifera COMO MATERIAL NATURAL PARA EL TRATAMIENTO DEL AGUA POTABLE EN PAÍSES EN VÍA DE DESARROLLO

    Directory of Open Access Journals (Sweden)

    Pablo Paredes Ramos

    2013-12-01

    Full Text Available En los países en vías de desarrollo como el Ecuador, los productos químicos para potabilizar el agua del río suelen ser importados, lo que implica un gran desembolso de divisas. Para tratar de mejorar la situación antes descrita, se han efectuado investigaciones en búsqueda de alternativas para el tratamiento de aguas para consumo humano, se orientan hacia el uso de elementos naturales. Uno de estos elementos es la Moringa oleífera se la conoce también como el árbol milagroso, ya que todos sus componentes dan diferentes tipos de utilidad. Tanto la semilla como el extracto contienen una proteína natural catiónica que absorbida por los gránulos de la arena del medio filtrante, hace que se active la cama de arena mejorando las remociones de turbiedad y los coliformes fecales, y que puede ser aplicable a las comunidades rurales de países subdesarrollados como el Ecuador.

  2. An 'OPEP' to the natural gas?; Uma 'OPEP' (Organizacao dos Paises Exportadores de Petroleo) para o gas natural?

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Tathiany R. [Agencia Nacional do Petroleo, Gas Natural e Biocombustiveis (ANP), Rio de Janeiro, RJ (Brazil); Szklo, Alexandre S.; Machado, Giovani V. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia (COPPE). Programa de Planejamento Energetico

    2008-07-01

    The development of the worldwide natural gas industry and the importance that this energy source has acquired in the energy matrix of various countries has given rise to certain uneasiness amongst the importing countries regarding the increase in gas dependence. This preoccupation is due to the fact that natural gas occurs in concentrated areas and that its major producers have joined together in the Gas Exporter Countries Forum, giving rise to a debate of the possibility of this Forum developing into cartel configuration. This paper aims at an analysis of the viability of cartel formation in the natural gas industry, following the same model as that of the oil industry. Considering the basic conditions necessary for successful cartel activities in the natural gas industry, the text presents some factors that can indeed contribute towards collusion among the exporting countries. However, the positive effects that a gas cartel can generate for the exporting countries are not guaranteed. On the contrary, what is actually observed are conditions favorable to the rupture of collusive deals and to an increase in the penetration of substitute energy sources, given that monopoly prices are fixed to the natural gas by the cartel. (author)

  3. Ecoefficiency indicators for natural gas transportation companies; Proposta de indicadores de desempenho ambiental para empresas do segmento de transporte de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    La Rovere, Emilio Lebre; Mariano, Jacqueline Barboza; Garcia, Katia Cristina; Salgado, Vivian Gullo [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Planejamento Energetico; Faertes, Denise [TRANSPETRO - PETROBRAS Transporte, Rio de Janeiro, RJ (Brazil); Barata, Martha Macedo de Lima [Fundacao Inst. Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, RJ (Brazil)

    2005-07-01

    This paper aims to present a cast of environmental indicators, more specifically ecoefficiency indicators, to natural gas pipeline transportation companies. So as to do that, are defined the concepts of ecoefficiency and sustainability with its principal related environmental indicators. The environmental impacts and aspects of the natural gas pipeline transportation are discussed, and the concept of cleaner service and production is considered in the context of this activity. Are also presented and analyzed the most important indicators of environmental performance used by oil and gas companies and by natural gas transportation companies, so as to support the choice of the proposed indicators. Finally, the cast of the indicators, which was based on the assessment of the Brazilian Northeast System of gas pipelines, operated by PETROBRAS Transporte S.A., TRANSPETRO, is presented. (author)

  4. Leito de drenagem: sistema natural para redução de volume de lodo de estação de tratamento de água Draining beds: natural system for sludge volume reduction in the water treatment plant

    Directory of Open Access Journals (Sweden)

    Cali Laguna Achon

    2008-03-01

    Full Text Available As Estações de Tratamento de Água (ETAs tem funcionamento semelhante a uma indústria e podem em diversas etapas gerar resíduos que, na maioria das ETAs, são lançados nos corpos d’água sem tratamento. Neste trabalho avaliou-se o desempenho de Leitos de Drenagem, para o desaguamento de lodo, provenientes de ETAs de ciclo completo que empregam sulfato de alumínio e cloreto de polialumínio (PACl, como coagulantes. Analisou-se as características, a drenagem e secagem dos amostras de lodo e característica do drenado. Os Leitos de Drenagem mostraram-se eficientes para desaguamento e redução de volume de lodo de ETA, de forma natural, sem consumo de energia ou adição de produtos químicos. Obteve-se, aos sete dias, reduções da ordem de 87 % em volume para os lodos de PACl e 83 % para o lodo de Sulfato de Alumínio e teor de sólidos totais 28% e 31% respectivamente.In this work the performance of Draining Beds for sludge dewatering was assessed. The sludge was provided from full cycle Water Treatment Plants (WTPs that employ aluminum sulfate and polyaluminium chloride (PACl as coagulants. The characteristics, drainage and drying of samples of sludge and characteristic of drained were analysed. The Draining Beds were shown to be efficient for dewatering and sludge volume reduction in the WTP, in a natural way, without energy consumption or adding of chemical products. On the seventh day, it was possible to obtain reduction around 87% in volume for PACl sludge and 83% for the aluminum sulfate sludge and total solids content of 28 and 31% respectively.

  5. Análise hierárquica para escolha entre agregado natural e areia de britagem de rocha para confecção de argamassas de revestimento

    Directory of Open Access Journals (Sweden)

    Alécio Júnior Mattana

    Full Text Available Muitas vezes as tomadas de decisão na indústria da construção são complexas, pois envolvem muitas variáveis, sendo trabalhoso agrupá-las e realizar uma avaliação global do problema. O método de análise hierárquica (AHP é uma ferramenta que auxilia na tomada de decisão em problemas de engenharia, nos quais diversos fatores devem ser levados em conta na escolha de métodos, produtos ou materiais. O objetivo principal deste artigo é mostrar a forma de aplicação do método de análise hierárquica para sistematizar tomadas de decisões na indústria de argamassas industrializadas. É apresentado um roteiro para verificar o traço de argamassa que apresenta melhor desempenho, considerando determinados resultados de ensaios e um conjunto de critérios previamente estabelecidos. A aplicação da AHP para esse problema resulta em um índice global que caracteriza o desempenho dos materiais com relação ao conjunto de critérios utilizado. O resultado apontou que a técnica de análise hierárquica pode ser eficaz apara apoiar a tomada de decisões na escolha de argamassas industrializadas. Na análise hierárquica realizada neste estudo, concluiu-se que, para os materiais envolvidos neste trabalho, a substituição da areia natural por areia de britagem é vantajosa em 78% dos casos.

  6. Caracterização de acessos de pimenta cumari de distribuição natural para fins de melhoramento genético

    Directory of Open Access Journals (Sweden)

    Marco Antônio Pereira Lopes

    2016-12-01

    Full Text Available A pimenta cumari (Capsicum baccatum var. baccatum, Capsicum baccatum var. praetermissum é uma espécie considerada semi-domesticada. As pesquisas no melhoramento genético e obtenção de plantas mais produtivas de pimenta cumari são de grande importância, uma vez que a cultura  é  pouco  difundida,  sendo  que  não  se  encontra  nenhuma  linhagem  comercial disponível. O presente trabalho teve como objetivo coletar, caracterizar materiais de pimenta cumari de distribuição natural e identificar materiais promissores a utilização em programas de melhoramento genético. Para isso, o trabalho foi divido em três etapas, sendo elas: coleta e identificação de materiais, análise da germinação e caracterização morfoagronômica. Na primeira fase foram realizadas visitas em propriedades de ocorrência de pimenta cumari, onde foram coletados frutos de nove plantas em regiões distintas para retirada de sementes, levantando as características das plantas e do local de ocorrência. Foram selecionados quatro materiais dos nove encontrados para implantação do ensaio, nomeadas de CH5, BI3, MA2 e CH2. A segunda etapa consistiu na avaliação da germinação das sementes com a adoção de algumas técnicas para quebra de dormência das sementes. Na última etapa foram realizadas avaliações para caracterização da planta de pimenta e dos seus frutos. Os dados foram submetidos à Análise de Variância, onde não obteve diferenças significativas para as características avaliadas.  Logo, pode-se observar que qualquer um dos materiais coletados apresenta potencial para utilização em programa de melhoramento genético.

  7. Proyección de costos de un bus articulado con motor dedicado a gas natural para ser utilizado en los sistemas de transporte masivo de colombia

    OpenAIRE

    MANTILLA, JUAN; ACEVEDO, HELMER; DUQUE, CARLOS; GALEANO, CARLOS; CARRION, SERGIO

    2009-01-01

    El objetivo del presente trabajo es mostrar los resultados del estudio comparativo de costos entre dos buses articulados que operan con diferentes combustibles, gas natural comprimido y diesel. Los resultados se utilizarán para establecer la viabilidad económica de la implementación de flotas de este tipo de buses en los sistemas de transporte masivo de las grandes ciudades colombianas. La proyección se realizó siguiendo las recomendaciones de operación y mantenimiento dadas por los fabricant...

  8. UTILIZACIÓN DE LA MODELIZACIÓN PARA TRABAJAR SALIDAS AL MEDIO NATURAL EN PROFESORES EN FORMACIÓN DE EDUCACIÓN SECUNDARIA.

    Directory of Open Access Journals (Sweden)

    Emilio Costillo

    2014-12-01

    Full Text Available En la enseñanza-aprendizaje de la Biología y Geología las salidas al medio natural constituyen una actividad específica y muy importante para los alumnos. Sin embargo, hay pocos estudios sobre el conocimiento específico de los profesores en esta actividad y menos sobre los profesores en formación. Los escasos estudios muestran la relevancia de trabajar esta actividad en la formación de estos profesores. Diseñamos una estrategia de enseñanza y aprendizaje basada en modelos para trabajar las salidas al medio natural con los futuros docentes. Participaron 48 profesores en formación de Educación Secundaria que estaban cursando el Máster Universitario en Formación del Profesorado en Educación Secundaria de la Universidad de Extremadura en la Especialidad de Biología y Geología durante los cursos 2011-2012 y 2012-2013. En primer lugar cada docente en formación grababa en video una supuesta salida al medio natural diseñada por el mismo como profesor. Posteriormente se visionaban en el aula estas grabaciones para analizar su conducta docente en ellas y el papel que le otorgaban a los alumnos. En general, estas actividades se planificaban excesivamente teóricas, centradas en el profesor y en determinados casos sin relación con las clases. Seguidamente se exponía la teoría sobre las salidas al medio natural junto con una puesta en común de los aspectos positivos y negativos del conjunto de grabaciones. Por último, cada profesor en formación debía hacer una reflexión personal sobre el diseño de su actividad, entendiendo muchos que para mejorarlas se debía haber dado un papel más activo a los alumnos

  9. Quality management system for petroleum and natural gas suppliers; Sistema de gestao da qualidade para os fornecedores da industria do petroleo e gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Oscar Felizzola [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Escola de Engenharia. Lab. de Tecnologia, Gestao de Negocios e Meio Ambiente (LATEC)]|[PETROBRAS, Rio de Janeiro, RJ (Brazil); Costa, Stella Regina R. da [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil)]|[Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil)

    2004-07-01

    The subject of this paper is the implementation of a quality management system for suppliers of products and services for the petroleum and natural gas industry that meet the ISO TS 29001:2003 Standard requirements. This technical specification establishes supplementary requirements to ISO 9001:2000 Standard for the product and service suppliers of the petroleum and natural gas industries. It was the result of a partnership between API and ISO TC 67. It intends to become the common and unique reference for the quality management systems requirements for the industry in the world. Therefore, it helps to avoid multiple systems that ask multiple audits for the certification. The generality of the ISO 9001:2000 Standard, reference for the quality management system for any organization , independent of its size, activity and location, not always satisfies all requirements of the specific sectors. (author)

  10. Fuel cells: new technology of natural gas for energetical building; Pilas de combustible: nueva tecnologia de gas natural para edificios energeticamente autoabastecidos

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez, A. M.

    2000-07-01

    Fuel Cells have emerged in the last decade as one of the most promising new and sustainable natural gas technologies for meeting the energy needs of all the economy sectors into the 21st century. Fuel Cells are an environmentally clean, quiet, and highly efficient method for generating electricity and heat from natural gas. A fuel cell is an electrochemical device that converts the chemical energy of a fuel directly to usable energy (electricity and heat) without combustion. For this reason, the application and use of the fuel cell technology may be the most important technological advancement of the next century. At the beginning of the 2000 year Sociedad de Gas de Euskadi, s. a. started a demonstration project in favour of the high-temperature planar solid oxide fuel cell (SOFC) for domestic micro-CHP utilization. This type is certainly most exacting from the materials standpoint, and it offers the advantage of uncomplicated fuel pretreatment. (Author)

  11. The Employment of spatial autoregressive models in predicting demand for natural gas; O Emprego de modelos auto-regressivos espaciais na previsao de demanda para gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Castro, Jorge Henrique de [Petroleo Brasileiro S.A. (PETROBRAS), Rio de Janeiro, RJ (Brazil); Silva, Alexandre Pinto Alves da [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Eletrica

    2010-07-01

    Develop the natural gas network is critical success factor for the distribution company. It is a decision that employs the demand given location 'x' and a future time 't' so that the net allows the best conditions for the return of the capital. In this segment, typical network industry, the spatial infra-structure vision associated to the market allows better evaluation of the business because to mitigate costs and risks. In fact, economic models little developed in order to assess the question of the location, due to its little employment by economists. The objective of this article is to analyze the application of spatial perspective in natural gas demand forecasting and to identify the models that can be employed observing issues of dependency and spatial heterogeneity; as well as the capacity of mapping of variables associated with the problem. (author)

  12. Model for negotiation on contingency plans for distribution of natural gas; Modelo de negociacao para planos de contingencia energetica na area de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Sobral, Marcos Felipe Falcao; Morais, Danielle Costa [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2008-07-01

    The high consumption of Natural Gas (NG), the environmental and economic turbulences that occurred in recent years raises questions about the supply of the product in critical situations. Characteristic factors of natural gas, like the high cost of storage, show the need for the establishment of contingency plans that define what procedures should be adopted in the distribution of Natural Gas or redistribute among consumers in times of restriction of supply, substantial increase on demand or reduction in the ability of supply. These plans aim to define in advance the actions that will be adopted, providing business and consumer segments clear rules indicate the time to search for alternative sources in case of crisis. The current models can not yet address the problem of negotiation for the division of the product following the concepts proposed by the science of trading, making things like proportionality and envy-free are not observed. The aim of this study is to propose a model for distribution of quotas for supply of NG between different consumer segments. The proposed algorithm combines the procedures of Knaster, Steinhaus and Divide the Dollar, seeking an allocation that minimize the feeling of jealousy and provide an equitable distribution. (author)

  13. Strategies for the goods and services market development: a new approach for the natural gas industry in Brazil; Estrategias para o desenvolvimento do mercado de bens e servicos: uma nova abordagem para a industria de gas natural no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Alonso, Paulo S.R. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil); Fernandes, Elton; Fonseca, Marcus V. de A. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia de Producao; Pinto, Maria C.L.F.P. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Quimica

    2004-07-01

    This work approaches the issue of developing the national goods and services market for the natural gas area, analyzing the constraints that exist today to the growth of the supply of goods and services and proposes innovative strategies and actions to accelerate the emergence of this supply. The suggested strategies and actions are presented in the form of two management models: the first aimed towards the development of pioneering equipment and the other directed to augmenting the supply of services within the country, focusing on human training programs, technological assistance to companies and the development of applied research projects. The models may be adopted by a company that intends to assume the leadership in the commercialization of natural gas, offering its clients not only a commodity but an energy solution. The innovation strategies applicable to each model are analyzed, discussing the advantages in the adoption of each one by the natural gas industry. The social profits resulting from the proposed actions and the general results expected from the adoption of the two models are presented focusing the contribution to foster the share of natural gas in the Brazilian Energy Matrix. (author)

  14. Prenatal tracheal ligation or intra-amniotic administration of surfactant or dexamethasone prevents some structural changes in the pulmonary arteries of surgically created diaphragmatic hernia in rabbits Ligadura de traquéia no período pré-natal ou administração intra-amniótica de surfactante ou dexametasona evitam algumas alterações estruturais nas artérias pulmonares de fetos de coelho com hérnia diafragmática congênita produzida com cirurgia

    Directory of Open Access Journals (Sweden)

    Consuelo J. Rodrigues

    2002-02-01

    Full Text Available PURPOSE: Characterization of the structural changes occurring in the pulmonary arteries resulting from surgically produced congenital diaphragmatic hernia in rabbits, with particular emphasis on the preventive effects of prenatal tracheal ligation or administration of intra-amniotic dexamethasone or surfactant. METHODS: Twenty rabbit fetuses underwent surgical creation of a left-sided congenital diaphragmatic hernia on the 24th or 25th gestational day. They were divided according to the following procedures: congenital diaphragmatic hernia (n = 5, congenital diaphragmatic hernia plus tracheal ligation (n = 5, congenital diaphragmatic hernia plus intra-amniotic administration of dexamethasone 0.4 mg (n = 5 or surfactant (Curosurf 40 mg, n = 5. On gestational day 30, all the fetuses were delivered by caesarean section and killed. A control group consisted of five nonoperated fetuses. Histomorphometric analysis of medial thickness, cell nuclei density, and elastic fiber density of pulmonary arterial walls was performed. RESULTS: Arteries with an external diameter > 100 mum have a decreased medial thickness, lower cell nuclei density, and greater elastic fiber density when compared with arteries with external diameter 100 mum. Prenatal treatments with tracheal ligation or intra-amniotic administration of dexamethasone or surfactant prevented these changes. In arteries with external diameter OBJETIVO: Caracterização das alterações estruturais que ocorrem nas artérias pulmonares de fetos de coelho com hérnia diafragmática congênita produzida com cirurgia, com destaque especial aos efeitos preventivos da ligadura de traquéia ou administração intra-amniótica de dexametasona ou surfactante. MÉTODOS: Vinte fetos de coelho foram submetidos a cirurgia para produção de hérnia diafragmática no 24º ou 25º dia de gestação. Os animais foram divididos de acordo com os procedimentos: hérnia diafragmática congênita (n = 5, hérnia diafragm

  15. Development of a motor for use compressed biogas or natural gas; Desenvolvimento de um motor para uso de biogas e gas natural comprimidos

    Energy Technology Data Exchange (ETDEWEB)

    Abreu, Ricardo S. de [Mercedes Benz do Brasil S.A. (Brazil)

    1986-12-31

    The Mercedes Benz do Brazil S/A since 1983 has been testing the utilization of biogas in a bus equipped with otto cycle motor. The main preoccupation was develop a specific motor for gas and not adapted a alcohol or gasoline motor. Biogas was tested in Sao Paulo in a bus that go through 40000 Km and natural gas was tested in 3 bus in Natal city. The results obtained until now show the good possibilities of both alternatives. All the developments utilized adapted motors and the results will be transpose for a new motor that will be produced by Mercedes Benz do Brazil. 3 tabs., 18 figs.

  16. Ocorrência de infecção natural de Fasciola hepatica Linnaeus, 1758 em Lymnaea columella Say, 1817 no Vale do Paraíba, SP, Brasil Natural infection by Fasciola hepatica in Lymnaea columella in the Paraíba river valley, S. Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Marlene Tiduko Ueta

    1980-06-01

    Full Text Available Foram registradas em Piquete, no vale do rio Paraíba do Sul (SP, Brasil, taxas de 1,22% e 0,14% de infecção natural em Lymnaea columella, por Fasciola hepatica. Em um único exemplar de Lymnaea columella dentre os 1.052 examinados, foram observadas rédias com xifidiocercárias, rédias com cercárias de Fasciola hepatica e metacercárias de Echinostomatidae.Infection rates of 1.22% and 0.14% were obtained in Lymnaea columella snails naturally infected by Fasciola hepatica. Samples of the snails were collected in Piquete, a municipality of Paraíba do Sul, a river valley area in the State of S. Paulo. Also observed was one of the 1052 specimen of the Lymnaea columella rediae which had xiphidiocercariae and rediae with Fasciola hepatica cercariae and metacercariae of Echinostomatidae.

  17. Imaginando «El paraíso natural»: representación y modernidad en Puerto Gaitán, Meta

    Directory of Open Access Journals (Sweden)

    Sergio Ramírez

    2012-01-01

    Full Text Available El municipio de Puerto Gaitán, en el departamento del Meta, ha cobrado importancia en el mapa económico de la nación colombiana. En el artículo muestro la formación de Puerto Gaitán en los últimos años explorando los cambios en los modos de explotación, producción y uso de la tierra, así como la emergencia de la imagen Puerto Gaitán Paraíso Natural. Posteriormente analizo esta representación de la naturaleza, mostrando la clase de estereotipos que se movilizan y los cambios en la imaginación del lugar y de la región de los Llanos orientales con esta publicidad. Por último muestro cómo la modernidad se expresa en este municipio a través de la producción de esta imagen, pasando por reflexiones que tocan tanto la imaginación de la diferencia como el gobierno del territorio. El Paraíso Natural aparece entonces como una imagen ambigua, que transita entre la universalidad y la particularidad, y que permite desmentir las prácticas explotadoras de los poderosos.

  18. Strategic environmental evaluation of natural gas - SEA/NG: a management tool for development of a environmental conservation policy; Avaliacao ambiental estrategica para o gas natural - AAE/GN: instrumento de gestao do desenvolvimento para uma politica de conservacao ambiental

    Energy Technology Data Exchange (ETDEWEB)

    Comar, Vito; Turdera, Mirko Valenzuela; Silva, Paulo Souza; Benedetti Filho, Edemar; Santiago, Etenaldo Felipe; Costa, Fabio Edir dos Santos [Universidade Estadual do Mato Grosso do Sul (UEMS), Campo Grande, MS (Brazil). Centro de Analise e Monitoramento Ambiental do Gas Natural (GASLAB); Moretti, Edvaldo; Oliveira, Jorge Eremites de; Sciamarelli, Alan; Freitas Filho, Jose Daniel de; Vieira, Maria Helena Pereira [Universidade Estadual do Mato Grosso do Sul (UEMS), Campo Grande, MS (Brazil); Soares, Afranio Jose Soriano [UNESP, Rio Claro, SP (Brazil); Oliveira, Henrique de; Comunello, Eder [EMBRAPA, Dourados, MS (Brazil). Centro de Pesquisas Agropecuaria do Oeste (CPAO); Freire, Luiz G.M. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The methodology for a Strategic Environmental Evaluation of Natural Gas - SEA/NG incorporates within the analysis of the project the socio-cultural, economic, energetic and environmental implications of the transformations, due to the adoption of natural gas, in the area of influence of gas pipelines and gas-powered thermo-electric plants. It was based on the case study of a gas pipeline planned to reach the city of Dourados from Campo Grande, capital of the Brazilian State of Mato Grosso do Sul, which implied the construction of a thermoelectric plant in Dourados. The SEA/NG: 1. Defines the best alternative track for gas pipelines; 2. Proposes location alternatives for gas-powered thermo-electric plants; 3. Evaluates the cumulative and synergic effects of human activities in the socio-environmental aspects; 4. Studies the dynamics of regional development; 4. Supports urban planning decisions in cities housing gas-powered thermo-electric plants; 5. Proposes a System of Analysis and Environmental Monitoring for Natural Gas. Qualitative-quantitative matrixes were used to evaluate the cumulative and synergic effects of the adoption of natural gas within the regional energy matrix, determine the best alternative track for the gas pipeline proposed from Campo Grande to Dourados, and to identify the best location for a gas-powered thermo-electric plant. The matrixes integrated the areas of geology, hydrology, ecology and socio-economics issues both in the phases of construction and operation of the pipeline. Diagrams and interactive conceptual models were also used to synthesize the principal components involved in the choice of the best gas pipeline alternative track. This project received financial grants from PETROBRAS, MSGAS, TBG and FINEP. (author)

  19. A regulatory model for conformity evaluation in natural gas building installations; Um modelo regulatorio para avaliacao da conformidade das instalacoes prediais de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Fossa, Alberto Jose; Santos, Edmilson Moutinho dos [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia

    2008-07-01

    The challenge of the Brazilian growth needs to consider necessarily the energy arrangements, and natural gas has relevant participation in this matter. The possibility of its end use that make possible an effective adequacy of our energy matrix must be supported by modern concepts of quality and conformity. In this particular, the program of 'Tecnologia Industrial Basica' (TIB), including concepts and application of conformity evaluation processes, is considered basic for the construction of a consistent gas market. This paper present the Brazilian reality related to TIB aspects and elements, from which it constructs a technician and regulatory building gas installations model proposal for a conformity evaluation program in the country. (author)

  20. Performance of a diesel engine transformed to spark ignition using natural gas; Desempenho de um motor diesel convertido para utilizacao de gas natural como combustivel

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez, Ricardo H.R. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (LEDAV/COPPE/UFRJ), RJ (Brazil). Lab. de Ensaios Dinamicos e Analise de Vibracao; Belchior, Carlos R.P. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (LMT/COPPE/UFRJ), RJ (Brazil). Lab. de Maquinas Termicas; Sodre, Jose Ricardo [Pontificia Universidade Catolica de Minas Gerais (PUC/Minas), MG (Brazil)

    2012-07-01

    A zero-dimensional thermodynamic model for a diesel engine converted for dedicated use of natural gas was developed in this work. The computational model covers from the time of closing the inlet valve to the time of opening the exhaust valve and it was divided into three stages (compression, combustion and expansion). A model based on the first law of thermodynamics for closed cycle has been developed to study the performance of the engine. The combustion process was modeled using the equation of Wiebe. It was taken into consideration the convective heat transfer through the walls of the cylinder and the heat transfer coefficient was calculated by the Eichelberg correlation. It was also considered that the thermodynamic properties vary with temperature. To represent the gas mixture behavior inside the cylinder two approaches (Ideal Gas Equation and Van Der Waals's Real Gas Equation) were used and results compared. The computational model was validated with experimental tests. (author)

  1. Suggestions to leak prevention in Fortaleza's natural gas piping system; Sugestoes para a prevencao de vazamentos de gas natural canalizado na regiao metropolitana de Fortaleza

    Energy Technology Data Exchange (ETDEWEB)

    Teles, Marcus de Barros [Agencia Reguladora de Servicos Publicos Delegados do Estado do Ceara (ARCE), Fortaleza, CE (Brazil)

    2004-07-01

    Leaks are the bigger problem in health, safety and environmental when the subject is gas distribution piping systems. Specially in high density human regions, like in the majority districts of Fortaleza, safety have to be the higher priority to the gas company responsible for the gas distribution piping systems. Leaks are able to cause accidents or incidents, depending on the circumstances which they happen. In order to be control the situation and overcome the luck factor, leaks must be previously avoided by the application of some security requirements. This paper present some suggestions to natural gas leak prevention in the Fortaleza's metropolitan region pipeline systems. First, the piping systems are analysed, observing the risk regions. Then, safety actions and basic requirements to avoid pipe corrosion are presented in order to improve safety in the gas distribution piping systems of Fortaleza's metropolitan region. (author)

  2. O modelo de pseudogestação em camundongos para o estudo 'in situ' das celulas Natural Killer uterinas

    OpenAIRE

    Juares Ednaldo Romero Bianco

    2006-01-01

    Resumo: Durante o período peri-implantacional na gestação de humanos e roedores, ocorre no estroma da mucosa uterina um conjunto de fenômenos que envolvem modificações dos componentes celulares e da matriz extracelular. Este conjunto de modificações é conhecido como decidualização ou reação decidual. Concomitante a este processo ocorre a migração de leucócitos provenientes de órgão hematopoéticos para este estroma. Dentre estes leucócitos predominam as subpopulações de linfócitos denominados ...

  3. Final feliz para um filme natural: Trem da Serra, poema da integração brasileira

    OpenAIRE

    Murari, Luciana

    2015-01-01

    Resumo Este artigo aborda o livro de poemas modernistas Trem da Serra, publicado por Ernani Fornari em 1928. Seu tema é uma viagem de trem de Porto Alegre a Caxias do Sul, no Rio Grande do Sul, expondo o efeito da imigração na região, e defendendo a miscigenação como forma de incorporação das influências estrangeiras à cultura nacional. São citados textos de autores como Graça Aranha, Monteiro Lobato, João Pinto da Silva e Plínio Salgado para demonstrar a importância do tema no debate sobre a...

  4. Efecto de surfactantes polimerizables en la distribución de tamaño de partícula, pH, viscosidad, contenidos de sólidos y de monómero residual de una resina estireno-butilacrilato Effect of polymerizable surfactants on particle size distribution, pH, viscosity, contents of solids and residual monomer of a styrene-butylacrylate resin

    Directory of Open Access Journals (Sweden)

    Luis A. Rios

    2013-01-01

    Full Text Available Se presentan los resultados de la polimerización en emulsión de una resina acrílica estirenada usando surfactantes polimerizables, los cuales presentan ventajas técnicas como baja formación de espuma, alta resistencia de la película al contacto con agua y buena estabilidad en la polimerización. Se evaluó el efecto de estos surfactantes polimerizables en la distribución de tamaños de partícula de la resina; además se determinaron propiedades finales de la resina tales como porcentaje de sólidos, porcentaje de monómero libre, viscosidad y pH. Estos resultados se compararon con los obtenidos usando surfactantes convencionales no polimerizables del tipo alquil fenol etoxilado y alquilarilpoliglicol éter sulfato de sodio. Los resultados indican que que se pueden remplazar totalmente los surfactantes convencionales no polimerizables por los surfactantes poliméricos evaluados sin afectar significativamente las propiedades de la resina, mientras que la sustitución parcial de los surfactantes no polimerizables por los polimerizables induce, en algunos casos, a la formación de partículas con mayor tamaño a las presentes en la muestra estándar.Results on the emulsion polymerization of a styrenated acrylic resin using polymerizable surfactants are presented. These surfactants exhibit low foaming, high film strength upon contact with water and good stability in the polymerization. A comparison was made with results for conventional non-polymerizable alkyl aryl polyglycol ether sulphate, sodium salt and nonylphenolethoxylate surfactants. The effect of these polymerizable surfactants on the particle size distribution of the resin was evaluated; in addition to determining the final properties of the resin such as solids content, free monomer content, viscosity and pH. It is feasible to totally replace non-polymerizable surfactants by the polymerizable surfactants evaluated without affecting significantly the properties of the resin, while

  5. Development of technology and systems for air-conditioned and cogenerations using natural gas; Desenvolvimento de tecnologia e sistemas para climatizaco e cogeracao usando gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Carlos Antonio Cabral dos; Varani, Celina Maria Ribeiro [Universidade Federal da Paraiba (UFPB), Joao Pessoa, PB (Brazil). Lab. de Energia Solar; Campos, Michel Fabianski [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    This preset work deal with a technological project that has as main objective the development of national technology in absorption refrigeration for application in the human thermal comfort with natural gas as energy source in direct fired or through energy recuperation of the combustion gases in cogeneration systems. This project makes part of the REDEGASENERGY and also receive financial support from CT-PETRO founds through FINEP, and also has as partner the local gas distributed company. The focus to be reached is the obtaining of a system of double effect using the solution pair Water-Lithium Bromide as work fluid to the capacity range of five to fifty tons of refrigeration. This range means a important branch on the market for minis-shopping, medical clinics, conveniences shopping, small hotels, motels, etc. The system is compound basically of heat exchangers: vapor generator, absorber, condenser, evaporator and intermediary exchanger. The design of the system is based on the thermodynamic, heat and mass analyses for each component. The concepts of exergy and irreversibility are used for through second thermodynamic law to realize the exegetic analysis and to identify the points of the most thermal lost. The correction on the identified components allows the improvements on the performance of each components and all system. As proposed steps to reach the final objective is established first the development of a single effect system operating in similar conditions of capacity and work fluid that the intended double effect system. (author)

  6. Model for the development of competition in the natural gas industry in Brazil; Modelo para o desenvolvimento da competicao na industria de gas natural no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Sant Ana, Paulo Henrique de Mello; Jannuzzi, Gilberto de Martino; Bajay, Sergio Valdir [Universidade Estadual de Campinas (NIPE/UNICAMP), SP (Brazil). Nucleo Interdisciplinar de Planejamento Energetico

    2008-07-01

    In the last 20 years, several countries have undergone to structural reforms in the gas sector, to increase the economic efficiency through the introduction of competition. This work proposes a framework to stimulate the development of competition in the gas sector in Brazil, based on a market forecast, the international experience and the characteristics of the market, structure and regulation in Brazil; the impacts of this framework in the market are also analyzed. According to the market forecasting, there will be a likely surplus of natural gas in Brazil. This surplus, allied with retail trading competition to be introduced in the states of Sao Paulo and Rio de Janeiro, together with a sound regulation that promote open access and transparency, moreover a regulated transmission, distribution and storage, may help to stimulate competition. If the framework is implemented, it would probably help the creation a wholesale and a retail gas market; stimulating risk management tools, i.e. derivative instruments; promoting a shift from long-term to short-term contracts between LDC's and shippers; creating a spot and future markets; and promoting a move towards spot and futures gas price indexing in mid- and long-term supply contracts. Competition would probably bring end-user prices down, as it happened in other countries that faced deregulation process. (author)

  7. Economic and financial feasibility analysis of natural gas urban distribution; Analise da viabilidade economica e financeira para o desenvolvimento da rede urbana de distribuicao de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Cabral, Guilherme G.; Cunha, Eduardo N.; Teixeira, Clovis C. [Companhia de Gas do Estado do RS (SULGAS), Porto Alegre, RS (Brazil)

    2008-07-01

    SULGAS has developed more judicious systematics investments analysis in the natural gas distribution plants in urban areas . A survey has been made of the variables that influence this type of investment, identifying the most relevant ones. Spread sheet in platform Microsoft Excel and Visual Basic was elaborated that makes possible the deterministic analysis, sensibility, and risk analysis of the projects, through consolidated indicators usable in economic engineering. The great differentiation of this proposal is the possibility/flexibility of the economic impact analysis that each future customer has in the branch where he is linked. The spread sheet presents graphical platforms in which the schematical drawings of the projects are inserted on satellite photos of the region, making possible the projects architectures visualization in parallel with the economic analysis. This graphical platform is tied with the alternatives selected in the economic analysis, being brought up to date the images in accordance with the projects selected in the spread sheet. The risk analysis are carried out through the Monte Carlo simulation, generating investment return probability from each branch, cell, or customer, depending on the criteria defined in the spread sheet. This makes possible the insertion and economic analysis of the factors that can influence the investments in NG distribution system, becoming an important tool in the decision making. (author)

  8. Construction of a dispositive with adsorption to determine the natural gas humidity contents; Desenvolvimento de um dispositivo com adsorcao para determinacao do teor de umidade do gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Nobrega, Geraldine A.S.; Chiavone Filho, Osvaldo; Medeiros, Gilsom G. de; Dantas Neto, Afonso A.; Barros Neto, Eduardo L. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil); Cavalcanti Neto, Avelino Q. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The natural gas is an energy resource with many applications. Researches have been developed to improve its quality and for specification of its components in accordance with ANP standards. The presence of pollutants (CO{sub 2}, H{sub 2}S, N{sub 2} and H{sub 2}O) demands that the gas suffers previous treatment, before being submitted to the separation process. The water in the gas provokes the hydrates formation and this can cause serious operation problems. The gases received in the collecting stations contains water at approximately 600 ppmv. According to the ANP standard 104/2002, the gas must present in its composition 125 ppmv of water to be sell. The search for humidity analyzers for gases with accuracy motivated this work. The construction of a device based on ASTM D - 4178/82 (revised in 1999), had the objective to create a calibrate for humidity analyzers, based on patterns of amount of known water. The dosage of water is made by adsorption with molecular sieve type 4A-513, 4-8 mesh and 8-12 mesh. The developed device will allow calibration rehearsals, experiments of adsorption in function of the temperature, flow, adsorbent, as well as the most necessary knowledge of the of water amount in the process. (author)

  9. Medição e modelagem simplificada da vegetação para simulação digital da iluminação natural

    Directory of Open Access Journals (Sweden)

    Eliana de Fátima Costa Lima

    Full Text Available Resumo Prever o efeito da vegetação arbórea no desempenho da iluminação natural é uma tarefa complexa e difícil, pois depende da reprodução precisa da passagem da luz através de suas copas. Variáveis como tamanho da folha, sua forma, refletância e transparência, entre outras, devem ser consideradas. Assim, modelar uma árvore reproduzindo exatamente a situação real é impraticável, não só devido à quantidade e complexidade das variáveis, como também por causa da sobrecarga do modelo. Nesse quadro, esta pesquisa tem por objetivos: aprimorar um método de medição da permeabilidade da vegetação arbórea à passagem da luz natural, que chamamos de "fração de lacuna da copa", utilizando a fotografia hemisférica e a análise de imagens; e aplicar as medidas resultantes em modelos digitais tridimensionais simplificados, para utilização em simulação computacional da luz natural. Três modelos experimentais, denominados de "persianas", "translúcido" e "frestas", foram desenvolvidos para simular quatro espécies arbóreas. Os níveis de iluminação em situação real e simulada de cada um foram comparados e validados segundo os indicadores MBE e RMSE relativos. O modelo "frestas", por exemplo, mostrou-se adequado às espécies pitombeira e carolina, com MBE relativo de 0,21 e -0,12 e RMSE relativo de 0,02 e 0,03 respectivamente, o que comprova a pertinência do método desenvolvido.

  10. The criteria for setting the natural gas reference price for purposes of government take calculation; Os criterios para fixacao do preco de referencia do gas natural para fins de calculo das participacoes governamentais

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Flavio Augusto Pimentel de; Rosa, Renata Gualberto Cordeiro [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2008-07-01

    The Petroleum Law states that the concession contract will also have provisions regarding the government takes established by the bid tender. However, the criteria for calculating the value of Royalties are set forth in the Decree 2.705/98, enacted to set such criteria, taking into account the volumes of production and the reference prices for oil and natural gas. The following aspects are analyzed in this paper: the method for calculating the volumes subject to the impact of Royalties; definition of the reference price for natural gas, the general rule for setting up the reference price in case the sale was made at market price; the special rule in case the sale was not made on a market basis, in case there is no sale or in case of breach of the conditions set in that Decree; and the settlement of the reference price in situations where only part of the volumes produced are sold on contracts that meet the requirements of the Decree. In conclusion the problems caused by gaps in legislation will be highlighted, particularly with regard to concessions granted to consortia as well as the inconsistencies between the applicable legislation, which may provide different analysis, including by the ANP, according to the features of each case. (author)

  11. Modelo de elementos finitos para la determinación de la frecuencia natural de las vibraciones de un dinamómetro. // Determination of the natural frequency of a dynamometer by means of finite elements model.

    Directory of Open Access Journals (Sweden)

    M. Jacas Cabrera

    2002-01-01

    Full Text Available El presente trabajo tiene como objetivo determinar la frecuencia natural (fn de un dinamómetro de dos componentes paramedir las fuerzas dinámicas producidas en un proceso de maquinado. La medición de la frecuencia natural se realiza pordos métodos, uno primero por medio de la modelación empleando el método de los elementos finitos (MEF, y un segundopor la vía experimental, con el fin de evaluar dicho modelo, y demostrar las posibilidades de esta herramienta de cálculo.Para la realización del trabajo se usó el programa de elementos finitos ALGOR ( R Superdraw III – Versión 12 . 06 WIN2000.De los resultados de este trabajo se observa la coincidencia de resultados entre los valores obtenidos experimentalmente ypor medio del MEF, encontrándose los mismos dentro del rango del 10% de error.Palabras claves: frecuencia natural, dinamómetro, elementos finitos, fuerzas dinámicas de maquinado.___________________________________________________________________________Abstract.The present work deals with determination of natural frequencies (fn of a two component dynanometer in order to measurethe dynamic forces produced during the mechanising process. The natural frequency is obtained by two methods, by meansof finite element method (MEF, as well as by the experimental way , with the purpose of evaluate the finite elementmodel, and demonstrate the possibility of this calculation tool. To accomplish this task the ALGOR finite element programVersion 12. 06 14 WIN Jan 2000 (R Superdraw III was used. From the results a practical coincidence between theexperimentally values and those obtained by means of the MEF, within the rank of 10% of error are observed.Key words: natural frecuency, dynamometer, finite element, dinamic forces on tool cutting.

  12. Technological evaluation of fuel cells using natural gas for distributed power generation; Avaliacao tecnologica da utilizacao de gas natural em celulas a combustivel para geracao distribuida de energia

    Energy Technology Data Exchange (ETDEWEB)

    Brandao, Mauricio O. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE). Programa de Engenharia Mecanica; Giannini, Marcio P.; Arouca, Mauricio C. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE). Programa de Planejamento Energetico

    2004-07-01

    The search for sustainable and more rational means of power generation motivates the scientific crew to search for more efficient and cleaner systems. Oil dependence becomes from the kind of development that the humanity had and cannot be dismissed. The question is how to use this source in a more intelligent way. Fuel Cells are electrochemical devices that convert into electric energy the chemical energy from oxi-reduction reactions between a fuel and an oxidant. The current fuel used in a Fuel Cell is hydrogen and oxygen is the oxidant. The great advantage of this device is its efficiency, higher than the one achieved with internal combustion engines. Also Fuel Cells are not limited by Carnot's efficiency. This paper is about the implementation of a distributed generation system using Fuel Cells. Technical aspects are approached together with economical and environmental needs. The already existence of Gas pipelines and the grown production of Natural Gas presented by Brazil turns it into a good market for the implementation of this energy source. The evaluation of this paper shows that is technically possible to use NG in Fuel Cells, mostly in South and Southeast regions, applying the distributed generation of energy concept. The most interesting in a strategic manner is that Brazil already have an indication that it's capable of developing this technology, opening a new market tuning with world's new technological developments. Many research centers develop this technology, not only from the cell composition itself, but also manufacturing techniques. (author)

  13. Gold nanoparticles applications in natural polymer modified for UV protection; Aplicacao de nanoparticulas de ouro em polimero natural modificado para protecao ultravioleta

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Iris O. da; Ladchumananandasivam, Rasiah; Nascimento, Jose H. O. do; Silva, Francisco C. da; Sa, Christiane S. de A., E-mail: iris.oliveira@gmail.com.br [Universidade Federal do Rio Grande do Norte (PPGEM/UFRN), Natal, RN (Brazil)

    2015-07-01

    The protein-based polymers such as milk, such as polylactic acid (PLA) and soya can be cited as examples of substrates used in various fields of engineering, mainly due to its character of biodegradability, generating low environmental impact when compared to chemical polymers to petroleum-based, which take years to decompose in nature. Among these, soy fiber has great application potential because it is a manufactured material base of a residue obtained from the existing folder in the soybean seeds after oil extraction, using resins and chemicals for structural modification. In this work, soy mesh was used to develop a material with ultraviolet protection properties, through the use of nanotechnology. Thus, to connect the gold nanoparticles (NPAu), the fabric had a surface charge modified with the use of chitosan, using 20% of the weight of the material, followed by nanomaterials exhaust process. The NPAu were synthesized via chemical synthesis with sodium nitrate as reducing and stabilizing agent. The analysis of the solution samples were evaluated by absorbance spectroscopy and solid materials through diffuse reflectance spectroscopy and XRD X-ray diffraction. The size of NPAu was evaluated in equipment Zetasizer nanoseries / nanoZ, finding nanoparticles with an average size of 34.59 nm, and also underlined plasmon resonance phenomenon, with peaks between 530 nm and red coloration, and good results from the soundness washes, compared to conventional dyeing. It was found that soy polymer treated with NPAu presented an excellent property with ultraviolet protection factor (UPF) of +50, considered excellent, proving its potential application in the biomedical field. (author)

  14. Un modelo de equilibrio general para la fijación de precios del gas natural en México

    Directory of Open Access Journals (Sweden)

    Dagobert L. Brito

    2005-01-01

    Full Text Available La Comisión Reguladora de Energía de México ha implantado una regla deen la ce ha cia atrás para unir el pre cio del gas na tu ral me xi ca no al pre cio delgas na tu ral de Te jas. Este en sa yo de mues tra que en una eco no mía abier ta,en la que los agen tes es co gen en tre el gas y otros com bus ti bles, y en la que lafun ción de den si dad que des cri be la dis tri bu ción de los agen tes a lo lar go delgasoducto puede tener intervalos vacíos y puntos de acumulación, la regla deen la ce ha cia atrás es óp ti ma en el sen ti do de Pa re to.

  15. Model to predict the flow of tracers in naturally fractured geothermal reservoirs; Modelo para predecir el flujo de trazadores en yacimientos geotermicos naturalmente fracturados

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez Sabag, Jetzabeth

    1988-02-01

    The proposed model has been developed to study the flow of tracers through naturally fractured geothermal reservoirs. The idealized system of the reservoir is made up of two regions: A movable region, where diffusion and convection mechanisms are present and a stagnant or immovable region where the diffusion and adsorption mechanisms are considered: in both regions the loss of mass by radioactive decay is considered. The solutions of the basic flow equations are in the Laplace space and for its numerical inversion the Stehfest algorithm was used. In spite of the numerical dispersion that these solutions involve, a well defined tendency to infer the system behavior under different flow conditions was found. It was found that, for practical purposes, the size of the matrix blocks does not have an influence on the concentration response, and the solution is reduced to the one presented by Tang and associates. Under these conditions, the system behavior can be described by two non-dimensional parameters: The Peclet number in fractures, P{sub e1}, and a parameter. The tracer response for the peak solution was also derived. An analytical solution limit was found for the case in which {alpha} tends to zero, which corresponds to the case of a homogenous system. It was verified that this limit solution is valid, for {alpha}<0.01. For the case of continuous injection, this solution is reduced to the one presented by Coasts and Smith. For the peak solution, it was found that the irruption time corresponding to the maximum concentration is directly related to the non-dimensional group. Therefore, it is possible to obtain the value of P{sub e1} for a given X{sub D}, or vice versa. A group of graphs of non-dimensional concentration in the fracture versus non-dimensional time, was developed. It was found that if P{sub e1} remains constant whereas {alpha} changes, the limit solution is the envelope of a family of curves in a graph of C{sub D} versus t{sub D}. In this figure P

  16. Natural Childbirth

    Science.gov (United States)

    ... Things That Help Feelings Expert Answers Q&A Movies & More for Teens Teens site Sitio para adolescentes ... the Pain? Print en español Parto natural Some women choose to give birth using no medications at ...

  17. Un método de reducción eficiente para problemas de optimización de redes de transporte de gas natural

    Directory of Open Access Journals (Sweden)

    Roger Z. Ríos Mercado

    2012-01-01

    Full Text Available Introducción: En este trabajo se estudia el problema de minimizar el consumo de combustible incurrido por las estaciones compresoras en un sistema de redes de transporte de gas natural en estado estable, el cual es uno de los problemas de mayor relevancia e importancia en la industria energética por la enorme cantidad de gas que se mueve por un sistema de distribución cada año. En el mundo real, este tipo de instancias son muy grandes, en términos del número de variables de decisión y del número de restricciones tecnológicas, y muy complejas debido a la presencia de no linealidad y no convexidad en el conjunto de soluciones factibles y en la función objetivo. Método: La contribución científica del presente trabajo consiste en presentar un estudio de las propiedades particulares de redes de gasoductos y explotarlas efectivamente para desarrollar una técnica que puede utilizarse para reducir significativamente la dimensión del problema sin alterar la estructura matemática del mismo. Resultados: Se presentan ejemplos de configuraciones de redes de diversos tamaños y como el método propuestoa ayuda a simplificarlas significativamente logrando reducciones relativas del 81 al 97%. Conclusión: El impacto inmediato del trabajo propuesto es que un problema de menor dimensión puede ser solucionado en mucho menor tiempo que el problema en su tamaño original, lo cual se traduce en un ahorro económico de recursos como lo es el tiempo de cómputo.

  18. Simulação computacional integrada para a consideração da luz natural na avaliação do desempenho energético de edificações

    Directory of Open Access Journals (Sweden)

    Evelise Leite Didoné

    Full Text Available A luz natural é uma importante estratégia para redução do consumo de energia em edificações. Para sua previsão, recomenda-se a utilização de programas de simulação que empregam arquivos climáticos e processam as simulações com o conceito do Daylight Coefficients. O EnergyPlus, programa para simulação termoenergética, é uma dessas ferramentas. Porém, este software possui limitações no módulo de iluminação natural que superestimam a luz natural em ambientes internos. Para contornar essas limitações, o presente trabalho propõe uma metodologia para avaliação da eficiência energética, considerando o aproveitamento da luz natural, através da utilização de dois programas. A metodologia consiste na avaliação do desempenho luminoso e energético através de simulação com os programas Daysim e EnergyPlus. O Daysim produz um relatório que descreve o controle da iluminação artificial que é utilizado na simulação energética do EnergyPlus, que calcula o consumo energético final dos ambientes analisados. Os resultados indicam que a metodologia proposta mostrou-se adequada para suprir as limitações do EnergyPlus e para a avaliação da eficiência energética em edificações, considerando o aproveitamento da luz natural. Este trabalho mostra um caminho alternativo e confiável para a consideração do aproveitamento da iluminação natural na avaliação da eficiência energética de edificações.

  19. An explanation for the natural de-bittering of Hurma olives during ripening on the tree; Una explicación para el desamargado natural de aceitunas Hurma durante su maduración en el árbol.

    Energy Technology Data Exchange (ETDEWEB)

    Susamci, E.; Romero, C.; Tuncay, O.; Brenes, M.

    2017-07-01

    Harvested olives require further processing to make them edible due to their content in the bitter substance oleuropein. However, some olives of the Erkence cultivar naturally de-bitter on the tree giving rise to the so-called Hurma olives. In this study, the evolution of the chemical characteristics of Erkence and Hurma olives harvested from the northeast and southwest area of trees located in the Karaburun Peninsula was assayed. It was confirmed that the oleuropein content in Hurma olives was much lower (< 2000 mg/kg fresh weight) than Erkence, which reached 35.000 mg/kg fresh weight at the beginning of the season. In addition, no free or polymerized anthocyanins were found in Hurma fruit in contrast to ripened Erkence fruit. The concentration of glucose was also lower in Hurma than Erkence olives. These results suggest that the enzymatic oxidation of oleuropein could be responsible for the natural de-bittering of Hurma olives during their ripening on the tree. [Spanish] Las aceitunas recién cogidas del árbol necesitan ser procesadas para hacerlas comestibles, debido a su contenido en el compuesto amargo oleuropeína. Sin embargo, algunas aceitunas de la variedad Erkence desamargan de forma natural en el árbol dando lugar a las aceitunas conocidas como Hurma. En este trabajo se han analizado las características químicas de aceitunas Erkence y Hurma recolectadas de la zona noreste y suroeste de árboles situados en la provincia de Karaburun. Se ha confirmado que el contenido en oleuropeína de aceitunas Hurma es muy inferior (< 2000 mg/kg) que Erkence, las cuales alcanzaron una concentración en dicha sustancia hasta de 35.000 mg/kg al principio del periodo de maduración. Además, no se encontraron en aceitunas Hurma antocianinas ni libres ni polimerizadas, a diferencia de Erkence. Estos resultados indican que la oxidación enzimática de la oleuropeína podría ser la responsable de la eliminación del amargor de forma natural en aceitunas Hurma durante su

  20. Obstáculos para el aprendizaje del modelo de evolución por selección natural en estudiantes universitarios de biología

    Directory of Open Access Journals (Sweden)

    Leonardo González Galli

    2017-01-01

    Full Text Available Numerosos estudios muestran que el aprendizaje del modelo de evolución por selección natural de Darwin es muy dificultoso en todos los niveles educativos. Entre los principales factores que dificultan el aprendizaje se encuentra la existencia y resistencia de ciertas concepciones alternativas. Este trabajo presenta los resultados de una investigación que busca identificar los modos generales de razonamiento - obstáculos - que subyacen a muchas concepciones de estudiantes de licenciatura en biología en relación con la evolución adaptativa. Para tal fin, se analizaron las respuestas a tres problemas y se caracterizó la estructura de las explicaciones producidas. Identificamos dos patrones explicativos principales, diferentes concepciones y tres obstáculos principales que denominamos i razonamiento centrado en el individuo, ii razonamiento causal lineal y iii teleología de sentido común. En particular, se analizó en detalle el rol del pensamiento teleológico en el razonamiento sobre la evolución.

  1. Obstáculos para el aprendizaje del modelo de evolución por selección natural, en estudiantes de escuela secundaria de Argentina*

    Directory of Open Access Journals (Sweden)

    Leonardo González Galli

    2015-03-01

    Full Text Available En este trabajo se presentan los resultados de una investigación tendiente a identificar los principales obstáculos para el aprendizaje del modelo de evolución por selección natural en estudiantes de dos cursos de secundaria. La existencia de dichos obstáculos se infiere a partir de la identificación y caracterización de los patrones explicativos y las concepciones que los estudiantes ponen en juego al explicar casos de evolución adaptativa, así como de análisis provenientes de la historia y epistemología de la biología y de la psicología cognitiva. Se identifican la teleología de sentido común, el razonamiento causal lineal y el razonamiento centrado en el individuo como tres obstáculos principales y se discuten algunas de las implicancias didácticas de estos resultados.

  2. Regulación de la activación de macrófagos alveolares por la proteína del surfactante pulmonar SP-A

    OpenAIRE

    Muñoz Minutti, Carlos A.

    2016-01-01

    Para facilitar el intercambio gaseoso, el pulmón tiene la mayor área del cuerpo en contacto con el medio externo. Se estima que hay alrededor de 300 millones de alvéolos en pulmones humanos adultos, lo que supone un área de contacto con el exterior 60 veces mayor que la superficie de la piel. Esta extensa superficie de contacto con el medio externo facilita la oxigenación, pero aumenta el riesgo de infección e inflamación por patógenos y endotoxinas presentes en el aire que respiramos. De hec...

  3. The daylight alternative for energy conservation saving in lighting systems; La luz natural alternativa para el ahorro de energia en sistemas de iluminacion

    Energy Technology Data Exchange (ETDEWEB)

    Escutia Perez, A.; Cruz Mendez, E. P. [Universidad Autonoma Metropolitana, Unidad Azcapotzalco, Mexico D. F. (Mexico); Buitron Sanchez, H. [Programa de Ahorro de Energia del Sector Electrico, Mexico D. F. (Mexico)

    1995-12-31

    arquitectonico de la edificacion, materiales y elementos de control, etc., para aplicar con precision el metodo de calculo. Las tecnicas fundamentales de alumbrado han variado poco. En la mayor parte de comercios e industrias se utiliza aun el alumbrado general, que produce una iluminancia mas o menos uniforme sobre el plano de trabajo, lo que garantiza una total libertad para la colocacion de maquinaria, bancos de trabajo, estanteria, expositores, percheros, etc. Este tipo de alumbrado se consigue mediante el empleo de una serie mas o menos regular de lucernarios. Se emplea iluminacion localizada adecuada en aquellas zonas que, a causa de la presencia de obstrucciones o de la inclinacion desfavorable del plano de trabajo, no esten suficientemente bien iluminadas por el alumbrado general. El empleo de la luz natural de acuerdo con la disponibilidad en cada momento permitira en muchos centros de trabajo una sensible disminucion de tiempo de utilizacion del alumbrado artificial, siempre que la situacion del accionamiento de la instalacion lo permita, en conjunto con controles modernos y la gran variedad de lamparas ahorradoras eficientes.

  4. Efeito de extratos orgânicos, associados ao surfactante tween 80, na germinação e crescimento de plântulas de alface Effect of organic extracts associated with surfactant Tween 80 on seed germination and seedling growth of lettuce

    Directory of Open Access Journals (Sweden)

    Cláudio Costa dos Santos

    2004-04-01

    Full Text Available Com este trabalho, visou-se a identificar, por meio de bioensaio, o efeito dos extratos de caruru (Amaranthus retroflexus L., capim-marmelada (Brachiaria plantaginea (Link. Hitchc., mentrasto (Ageratum conyzoides L. e de três cultivares de milho (AG1051, C333 e C435 sobre a germinação e crescimento de alface (Lactuca sativa L. cv. Marisa AG216. Os extratos metanólicos foram concentrados sob vácuo e solubilizados em surfactante Tween 80 a 1% (v/v em água. A seguir, aplicaram-se as soluções obtidas em papel de filtro sobre placa de Petri, onde foi semeada alface. Utilizaram-se água destilada como testemunha e surfactante Tween 80 a 1% como tratamento branco. O extrato de mentrasto, o de caruru e da cultivar de milho AG1051 promoveram redução no índice de velocidade de germinação em relação à testemunha com água destilada. O percentual de germinação foi afetado apenas pelo extrato de mentrasto (82,5% de redução. Todos os extratos e o surfactante Tween 80 provocaram inibição do crescimento de radículas de plântulas de alface, com redução de comprimento de raiz entre 9,53 e 14,83 mm, e de hipocótilo, entre 21,6 a 30,95 mm.This work aimed at identifying, through bioassay, the effect of organic extracts of pigweed (Amaranthus retroflexus L., signal grass (Brachiaria plantaginea (Link. Hitchc., ageratum (Ageratum conyzoides L. and three corn cultivars (AG1051, C333 and C435 on lettuce (Lactuca sativa L. cv. Marisa AG216 germination and seedling. Thus, the methanolic extracts of their straws were concentrated under vacuum and dissolved in 1% (v/v aqueous surfactant Tween 80. Then, the resulting solutions were applied to filter papers contained in Petri dishes, where lettuce was sowed. Distilled water and 1% Tween 80 were used as controls treatment. The corn cultivar extracts AG1051, pigweed and ageratum promoted reduction of the germination index in relation to the control with distilled water. The germination percentage was

  5. Utilização de surfactantes, na polpação kraft de madeira de eucalipto, como auxiliar na remoção de extrativos lipofílicos Surfactant utilization in kraft pulping of eucalyptus wood to improve lipophilic extractives removal

    Directory of Open Access Journals (Sweden)

    Deusanilde de Jesus Silva

    2004-12-01

    Full Text Available Problemas de deposição de "pitch" em fábricas de celulose e de papel são atribuídos aos extrativos lipofílicos existentes na madeira. Uma das maneiras mais eficientes de controlar essa deposição é através da remoção de seus precursores do sistema, logo que possível, nas etapas de cozimento, lavagem da polpa marrom e pré-deslignificação com oxigênio. O uso de surfactantes como aditivos da polpação tem sido investigado, mas há grande deficiência de informações técnicas, e a aplicação industrial é, ainda, incipiente. A proposta deste trabalho foi analisar a viabilidade de minimizar a deposição de "pitch", intensificando a remoção de suas substâncias precursoras na etapa de polpação pelo uso de tensoativos sintéticos com propriedades umectantes e solubilizantes. Foram testados 20 princípios ativos de surfactantes em cozimento kraft convencional de madeira de eucalipto. Os resultados, alguns estatisticamente significativos, apontaram redução do teor de substâncias lipofílicas na polpa marrom. Foi observado que a remoção dos extrativos lipofílicos da madeira é afetada, inversamente, pelo teor de óxido de eteno na molécula do surfactante. Outros parâmetros de cozimento, como deslignificação, rendimento, teor de rejeitos e viscosidade da polpa, foram também avaliados.Extractives are pitch precursors and may decrease pulping efficiency and affect pulp quality. Probably, the most efficient way to minimize pitch problems is to remove their precursors from the system during cooking, pulp washing and oxygen delignification. Use of surfactants as pulping additives has been investigated but technical information is deficient and industrial application is very incipient. The objective of this study was to analyze the performance of different surfactants as additives for kraft pulping of Eucalyptus wood. Twenty surfactants with different basic chemical structures were used. The results demonstrated that

  6. Characterization of sodium bentonites: effect of treatment with ammonium salt- free organic surfactant; Caracterizacao de bentonitas sodicas: efeito do tratamento com surfactante organico livre de sal de amonio

    Energy Technology Data Exchange (ETDEWEB)

    Morita, R. Y.; Barbosa, R. V.; Kloss, J.R., E-mail: julianaweber@utfpr.edu.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil). Dartamento de Quimica e Biologia

    2015-07-15

    Bentonite, which the main clay mineral is montmorillonite, are commercially attractive because of its abundance in nature. The clays can be modified by ion exchange reactions of ions contained in the interlayer region with cationic surfactants that include ammonium or phosphonium salts. The clays origin and the type of surfactants (modifiers) are the main factors in the alteration of physical and chemical properties of these materials. This study aims to characterize and compare the results of natural bentonite commercially available and the effect of treatments with quaternary ammonium salt and an organic compound free of ammonium salt. The FTIR and XRD results indicate the process of organophilization of clays after treatment with the surfactants. These treatments have altered the average particle size, suggesting the formation of agglomerates, which was showed in the SEM images. The results of surface area and particle size data indicated the presence of larger particles. Although the two surfactants have shown similarities in the investigated properties, the organoclays free of ammonium salt are more promising in terms of its use as well as for their preparation and solubility. (author)

  7. VAZÕES ESPECÍFICAS MÍNIMAS PARA SECAGEM DO MILHO COM AR NATURAL EM BOTUCATU-SP MINIMUM AIRFLOW RATES TO DRY CORN GRAIN WITH NATURAL AIR IN BOTUCATU-SP

    Directory of Open Access Journals (Sweden)

    V. A. Gonçalves

    2007-09-01

    Full Text Available

    Recomendam-se à secagem com ar natural vazões específicas suficientemente baixas, reduzindo a potência requerida pelo ventilador e contribuindo para o arrefecimento da sobressecagem. Através de modelos matemáticos de simulação foram determinadas as vazões específicas mínimas necessárias à secagem com ar natural do milho a granel, nas condições climáticas do município de Botucatu, no Estado de São Paulo, correspondentes aos meses de março a junho do ano de 1971, cujo potencial de secagem foi o mais drástico dentro de um período de 10 anos analisado. Foram considerados para o milho os teores de umidade inicial, base úmida, de 22%, 20% e 18%, obtendo-se os respectivos períodos de armazenamento seguro de 7, 11 e 29 dias, em função da temperatura média de 23,40C do mês de março de 1975, a mais elevada do período de 10 anos analisado. Outrossim, as médias empregadas, temperatura de bulbo seco e umidade relativa, foram obtidas a partir dos registros horários do termo-higrógrafo, localizado na Estação Meteorológica da Faculdade de Ciências Agronômicas de Botucatu, no Estado de São Paulo. Foi considerada somente a secagem seletiva dentro dos períodos diários das 9 às 17 horas, 9 às 18 horas e 8 às 18 horas, dada a impossibilidade de realização da secagem contínua, já que as condições de equilíbrio entre o ar e o grão não possibilitaram a redução do teor de umidade final ao nível recomendado ao armazenamento seguro. Constatou-se que a queda do teor de umidade de equilíbrio do grão em poucos pontos percentuais acarreta elevados decrementos nas vazões específicas mínimas requeridas. Outrossim, uma redução de poucas horas no período diário de operação do ventilador requer significativos incrementos nas vazões específicas mínimas para a realização da secagem dentro do tempo de secagem admissível.

  1. Presencia de Aedes (Stegomyia aegypti (Linnaeus, 1762 y su infección natural con el virus del dengue en alturas no registradas para Colombia

    Directory of Open Access Journals (Sweden)

    Freddy Ruiz-López

    2016-06-01

    Conclusión. Por primera vez se registró A. aegypti a 2.302 msnm, la mayor altitud registrada para este vector en Colombia. De igual forma, se encontró infección con el virus del dengue a 1.984 msnm. Estos hallazgos son significativos, ya que determinan regiones de Colombia con riesgo potencial de transmisión autóctona de dengue y otros arbovirus por A. aegypti.

  2. Aplicación de modelos de nicho ecológico para la localización de seis plantas amenazadas en el Parque Natural de Els Ports (noreste de la Península Ibérica

    Directory of Open Access Journals (Sweden)

    Buira, A.

    2016-12-01

    Full Text Available The precise location of threatened species’ populations is essential to evaluate their conservation status. In this study, we explore the usefulness of ecological niche models to find six rare and threatened plant species within the Natural Park Els Ports (northeast of Iberian Peninsula. Habitat suitability models were generated with the algorithm Maxent and transformed into binary (presence/absence using a decision threshold. The models were validated by leave-one-out cross-validation. The sampling was directed to the areas with the highest number of predicted presences. The predictive ability was evaluated by calculating the values of sensitivity, specificity and accuracy with data from field sampling. 28 new occurrence data from five different species were found, the 89% of which were predicted by the models. This has enabled us to acquire a better knowledge of the range and real occupancy area of these species within the Natural Park. The results show that models can be useful in prioritizing the sampling efforts of threatened species with few records, especially for those with small geographic ranges and limited environmental tolerance.La ubicación precisa de las poblaciones de especies amenazadas es esencial para evaluar su estado de conservación. En este trabajo se explora la utilidad de los modelos de nicho ecológico para la localización de seis plantas raras y amenazadas dentro del Parque Natural de Els Ports (noreste de la Península Ibérica. Para ello se generaron modelos de idoneidad del hábitat con el algoritmo Maxent y se transformaron en binarios (presencia/ausencia aplicando un umbral de corte. Los modelos se validaron mediante validación cruzada dejando uno fuera (Leave one out. El muestreo se dirigió hacia las áreas con mayor número de presencias predichas. La capacidad predictiva se evaluó mediante el cálculo de los valores de sensibilidad, especificidad y precisión con los datos obtenidos en el muestreo de

  3. La península de Paraguaná: Un paisaje natural para la enseñanza de la morfología litoral en Ciencias de la Tierra

    Directory of Open Access Journals (Sweden)

    Belmary Cecilia Barreto Pineda

    2016-12-01

    Full Text Available Esta investigación busca proponer el paisaje natural de la Península de Paraguaná como recurso didáctico en la asignatura Ciencias de la Tierra en la U.E.P John Wycliff. Con una metodología descriptiva, de proyecto factible, incluyendo una fase documental y diseño de campo no experimental. En relación al diagnóstico de los “Recursos Didácticos”, el 79% de los encuestados afirman que no se utilizan paisajes para impartir clases de Ciencias de la Tierra debido a la falta de motivación de los docentes por implementar recursos que se relacionen con el paisaje natural. Se generó una propuesta representada por un paquete didáctico constituido por la sección preliminar, fundamentos teóricos, video educativo, catálogo fotográfico, referencias bibliográficas e itinerario geográfico pedagógico que interrelacionan al estudiante con el entorno. Se recomienda su aplicación para los contenidos sobre Morfología litoral en Ciencias de la Tierra. Palabras Clave:  Recurso didáctico, paisaje natural, ciencias de la tierra, educación Paraguaná's Peninsula: A Natural Landscape for Teaching Coastal Morphology in Sciences of the Earth Abstract This investigation will propose the natural landscape of Paraguaná's Peninsula as a didactic resource in the subject Earth Sciences in the U.E.P John Wycliff. It was made using a descriptive methodology and a feasible project, with a documentary phase and non-experimental design field. In relation to the diagnosis of the “Didactic Resources", 79% of the respondents affirmed that landscapes are not used as part of the Teaching Program for Earth Sciences, due to the lack of motivation of teachers to implement resources that relate to the natural landscape. It was generated an offer based on the natural landscape of Paraguaná's Peninsula as a resource for teaching Earth Sciences, represented by a didactic package, structured with a preliminary section, theoretical foundations, educational video

  4. Analysis of utilization of natural gas with different proposals i n two sugar-alcohol industries of Sao Paulo state; Analise da utilizacao do gas natural para diferentes propositos em duas usinas sucroalcooleiras paulistas

    Energy Technology Data Exchange (ETDEWEB)

    Uchoa, Thales B.; Mashiba, Marcos Hideo S.; Saran, David J.; Maia, Cassio Roberto M.; Ramos, Ricardo Alan V. [Universidade Estadual Paulista (UNESP), Ilha Solteira, SP (Brazil). Dept. de Engenharia Mecanica. Nucleo de Planejamento Energetico, Geracao e Cogeracao de Energia], e-mail: nuplen@dem.feis.unesp.br

    2006-07-01

    In this work is analyzed the viability of the gas natural utilization as supplemental combustible in two sugar-alcohol industries of Sao Paulo State with different proposals. One of these industries is located in a region where there is a great demand of sugar cane bagasse by other industries and because that its objective is the use of natural gas for surplus of bagasse for commercialization. The other industry is located in a region near a hydroelectric complex where there is several transmission lines and because that its objective is the use of natural gas for surplus of electricity for commercialization. Thermodynamic e thermo economic studies of the modified plants of these industries to permit the combined use of bagasse and natural gas, including the installation of gas burners in the boilers and/or the installation of a gas turbine and a heat recovery steam generator, are carried out and the obtained results are discussed. (author)

  5. Thoughts about the history of Brazilian energy matrix and the definition of new strategies for the natural gas; Reflexoes sobre a historia da matriz energetica brasileira e sua importancia para a definicao de novas estrategias para o gas

    Energy Technology Data Exchange (ETDEWEB)

    Fernandes, Flavio; Santos, Edmilson Moutinho dos [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia. Programa Interunidades de Pos-Graduacao em Energia (PIPGE)

    2004-07-01

    This paper remembers the mainly historical facts that conduct the industrial development in Brazil and the consolidation of national energetic matrix. It was analyzed particularly the gap between 1850 and 1970, explaining how petroleum became into the most important energetic considering the Brazilian reality. At the sequence, the paper look to extract, from historical retrospective, essential elements that should be present when new strategies will be defined to increase the natural gas in the Brazil's energetic matrix nowadays. It was analyzed, critically, the sense and efficiency of the main public politics implemented between different historical periods. It was emphasized the importance of these interpretations to the reflection of politics more closed with natural gas, whose must be faced not only like a alternative of energy, but also like important link to a industrial modernization process, technological development and construction of a production system more competitive. (author)

  6. Diseño de Reglas Gramaticales para Transformar Documentos Técnicos Corporativos Escritos en Lenguaje Natural en Discursos Controlados

    Directory of Open Access Journals (Sweden)

    Carlos Mario Zapata Jaramillo

    2013-04-01

    Full Text Available La educción de requisitos es una de las fases más importantes en el proceso de desarrollo de software. La revisión de documentos es una de las técnicas menos usadas para educir requisitos. La literatura sugiere usarla en esta fase sobre descripciones del dominio y documentos corporativos. Aplicando esta técnica, los analistas pueden extraer conocimiento del dominio e información del negocio. En este artículo se define un marco estructural de un tipo de documento técnico corporativo, relacionado con la especificación de procedimientos. A partir de este marco, se propone un conjunto de reglas gramaticales para transformar ciertas secciones del documento técnico en un discurso en el lenguaje controlado UN-Lencep. Estas reglas se pueden aplicar posteriormente en procesos de educción de requisitos a partir de la técnica de revisión de documentos.

  7. Implementación de sistemas de gestión integral sustentable para destinos turísticos, caso de estudio Parque Nacional Natural Utría, playa La Aguada – Colombia

    Directory of Open Access Journals (Sweden)

    Fernando Gutiérrez-Fernández

    2016-03-01

    Full Text Available En el presente proyecto se diseñó e implementó un sistema de gestión integral sustentable para playa La Aguada, en tres niveles de gestión: estratégico, táctico y operacional; ya que se comparó dicha playa con una organización. Para el diseño del sistema, el primer paso fue determinar los requisitos establecidos en la NTS TS 001-2, que es la norma correspondiente en Colombia a la certificación de destinos turísticos de playa. Esta certificación busca mejorar, no solo las condiciones en el ámbito ambiental, sino que exista una transversalidad entre el componente ambiental, el socio-cultural, el económico y el de seguridad, contribuyendo al progreso y al mejoramiento de la calidad de vida de la comunidad anfitriona que se involucra directamente con la actividad del turismo. Playa La Aguada, se encuentra ubicada en el Parque Nacional Natural de Utría en el Departamento de Choco – Colombia y como destino turístico, tiene un principal atractivo que es el avistamiento de ballenas Jorobadas o Yubartas (Megaptera novaeangliae Sin embargo, en los últimos años esta actividad se ha visto complementada por la realización de otro tipo de actividades eco turísticas, para lo cual la Unidad Administrativa Especial del Sistema de Parques Nacionales Naturales ha construido cabañas de alojamiento y un centro de visitantes. Por lo que esta se ha convertido en el lugar donde se recibe la mayor cantidad de visitantes, en el área natural y cuyo flujo se da durante todo el año; de manera que es necesario trabajar en su organización, buscando que el turismo no se convierta a futuro en una actividad perjudicial.

  8. Análisis del flujo ambiental y propuesta metodológica para simulaciones CFD aplicadas a la ventilación natural de invernaderos

    OpenAIRE

    GRANELL RUIZ, RAFAEL

    2014-01-01

    El cultivo protegido bajo invernadero tiene altos costes energéticos derivados de la ventilación forzada. En cambio, la ventilación natural puede ser una solución barata que reduzca el consumo energético. No obstante, un diseño que permita la ventilación natural del invernadero supone un reto debido a la complejidad del fenómeno físico. Frente a otros métodos de diseño, como los métodos experimentales o analíticos, en los últimos tiempos la dinámica de fluidos computac...

  9. Energy crisis: contributions to reduce impacts on Rio de Janeiro state industry caused by shortage of natural gas supply; Crise energetica: contribuicoes para a reducao de impactos sobre a industria fluminense decorrente de um contingenciamento da oferta de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, Cristiano Prado M.; Silva, Tatiana Lauria Vieira da [Sistema FIRJAN, Rio de Janeiro, RJ (Brazil). Gerencia de Infra-estrutura e Novos Investimentos], e-mail: cpbarbosa@firjan.org.br, e-mail: tlsilva@firjan.org.br

    2008-07-01

    The scope of this paper is to discuss the main factors that pushed the increase of the industrial utilization of natural gas in Rio de Janeiro and the structural imbalance between supply and demand in this market on the second semester of 2007. The shortage in October 2007 brought uncertainty to the energetic supply to the industrial sector, and leaded to a crisis in January 2008. In order to evaluate the hindrances and to propose solutions aiming to prevent future crisis, the Federation of Industries of Rio de Janeiro - Sistema FIRJAN - did a research along with industries that represent the majority part of the industrial demand of natural gas in Rio de Janeiro. The main results show that the industries are inclined to adapt to this new reality by lowering the consumption of natural gas. Nonetheless, environmental, institutional and economic issues make it difficult, and sometimes impossible, to implement the change. Beyond mapping the Rio de Janeiro industry's consumption of natural gas, this paper calls for the necessity of a long-run energetic planning in order to face the challenges that are being posed to the natural gas chain. (author)

  10. CONTENT ORGANIZATION IN THE NATURAL SCIENCES SUBJECTS, TO FAVOR PROBLEM RESOLUTION / TRATAMIENTO AL CONTENIDO DEL ÁREA DE LAS CIENCIAS NATURALES PARA FAVORECER LA RESOLUCIÓN DE PROBLEMAS

    Directory of Open Access Journals (Sweden)

    Yanet Edith Batista Freyre

    2013-04-01

    Full Text Available It was presented the need of improving the area of Natural Sciences in the teaching-learning process in primary schools to solve problems, as a component in the comprehensive formation of scholars; that is, to get advantage from the curriculum, the cultural-historical experience and the social interaction of the scholar to favor it, is the essence of this article. In this aspect it plays an essential role the knowledge of the contents of the subjects of the area of Natural Sciences in the primary school. They possess wide potentialities to contribute to this pretense, keeping in mind that besides instructing the children in the appropriate interpretation of the phenomena and processes that happen in nature and society, they favor a general culture on the repercussion and the man's sustainable action on nature, as well as the necessity of their care and conservation. RESUMEN: Se abordó la necesidad de perfeccionar el aprendizaje del área de las Ciencias Naturales en el proceso de enseñanza-aprendizaje de la escuela primaria para resolver problemas, como parte de la formación integral del escolar; en tal sentido, aprovechar el currículo, la experiencia histórico – cultural del escolar y su interacción social para favorecerlo, es la esencia de este articulo. En este aspecto juega un papel esencial el tratamiento a los contenidos del área, los que poseen amplias potencialidades para el desarrollo de la resolución de problemas, y de esta forma contribuir a esta pretensión, teniendo en cuenta que además de instruir a los escolares en la adecuada interpretación de los fenómenos y procesos que ocurren en la naturaleza y la sociedad, propicia una cultura general sobre la repercusión y la acción sostenible del hombre sobre la naturaleza, así como la necesidad de su cuidado y conservación.

  11. The natural gas as a strategic option for the development of Brazil Northeastern region; O gas natural como uma opcao estrategica para o desenvolvimento da Regiao Nordeste Setentrional do Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Marcusso, Jose Luiz; Lima Junior, Giovanni G.B.; Nascimento Filho, Epitacio [PETROBRAS, Natal/Fortaleza, RN/CE (Brazil). Gerencia de Exploracao e Producao

    1995-12-31

    This paper presents development, status and future of natural gas industry in northeastern Brazil (States of Rio Grande do Norte and Ceara), highlighting the gradual increase in product offering and showing main difficulties in achieving a larger market share. PETROBRAS (Brazilian National Oil Company) contribution for economical development of these is also pointed up. (author). 10 refs., 8 figs

  12. Lighting measurement station: measurements of natural lighting for characterization of sky and zenith illuminance; Estacao de medicao de iluminacao: medicao de niveis de iluminacao natural para caracterizacao de iluminancias de ceu e luminancia de zenite

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Roberta Vieira Goncalves de [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Escola de Arquitetura. Dept. de Tecnologia da Arquitetura e do Urbanismo]. E-mail: roberta@arq.ufmg.br; Pereira, Fernando Oscar Ruttkay [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Arquitetura. Lab. de Conforto Ambiental]. E-mail: feco@arq.ufsc.br

    2002-07-01

    This paper describes the assembly of a standard station for measuring the day lighting for evaluation of the natural light availability. The mounting and data obtention form will also be described from a standard IDMP day lighting station for measuring the data from measuring zenith, horizontal, and vertical illuminance of the sky and vertical irradiance for the cardinal points.

  13. CFD como ferramenta para simular ventilação natural interna por ação dos ventos: estudos de caso em tipologias verticais do "Programa Minha Casa, Minha Vida"

    Directory of Open Access Journals (Sweden)

    Juliana Magna da Silva Costa Morais

    Full Text Available Resumo A ventilação natural é uma estratégia projetual passiva que deve ser usada sempre que possível em países de clima quente como o Brasil. Entre os vários métodos para predizer o comportamento da ventilação natural está o uso da dinâmica de fluidos computacional. O objetivo deste artigo é analisar a ventilação natural por ação dos ventos no interior de edifícios usando o método de simulação por CFD. A pesquisa toma como estudos de caso três edifícios multifamiliares do Programa Minha Casa, Minha Vida. Analisou-se o desempenho da ventilação para três ângulos de incidência do vento (0º, 90º e 135º. São apresentados resultados quantitativos (velocidade média do vento em cada ambiente interno e qualitativos (imagens do fluxo de ar externo e interno. Os resultados indicaram melhor desempenho de ventilação na tipologia 1, com planta do tipo "H", na qual a abertura localizada na grande reentrância representou papel determinante. Na tipologia 2, com volumetria próxima ao quadrado, a solução de ventilar banheiro e cozinha através da abertura da área de serviço mostrou-se ineficiente. O pior desempenho foi verificado na tipologia 3, caracterizada por maiores fachadas monolíticas (sem reentrâncias.

  14. Natural gas ballast requirement to allow participation of thermal plants in the new energy auctions: analysis and proposals; Requisito de lastro de gas natural para viabilizar a participacao de termeletricas nos leiloes de energia nova: analise e propostas

    Energy Technology Data Exchange (ETDEWEB)

    Avila, Pedro Luis de; Bezerra, Bernardo Vieira; Barroso, Luiz Augusto Nobrega; Pereira, Mario Veiga; Rosenblatt, Jose [PSR, Rio de Janeiro, RJ (Brazil)

    2012-07-01

    Since the first New Energy Auction (LEN), held in December 2005, there has been a continuous process of improving the auction rules and mechanism. For the specific case of gas-fired plants, a significant change was observed between the LEN A-3/2011 and LEN A-5/2011, and refers to the need of natural gas ballast for candidate projects in the auction. This rule was introduced by ANP Resolution No. 52, which establishes that the gas supply agreements must be backed up by proven reserves (analogous to the requirement in the power sector contracts of physical guarantee backup), and Ordinance MME No. 21/2008, which deals with power plants qualification for the new energy auctions. The latter was amended by MME Ordinance No. 514, which requires proven natural gas reserves to support the GSA of all candidate projects in a LEN. In other words, the gas supplier now has to prove that there are sufficient gas reserves to meet requirements of all candidate project in an auction, regardless of the plausibility of their engagement in the auction. In this context, the present study discusses these issues and has as main contributions: (I) a review of current regulations on contract ballast in the Brazilian natural gas sector, (II) a proposal to conciliate the need of fuel supply contract ballast to the dynamics of the natural gas sector, and (III) a proposal to conciliate the need for fuel contract ballast to the contracting process of the thermoelectric power in the new energy auctions. These contributions aim at a better integration between the sectors of natural gas and electricity in Brazil, leading to a more efficient use of resources and infrastructure development. (author)

  15. Propuesta metodológica para la zonificación funcional de áreas naturales protegidas terrestres desde la perspectiva del paisaje. Methodological proposal for functional zoning of terrestrial natural areas protected from the landscape perspective.

    Directory of Open Access Journals (Sweden)

    Adonis Maikel RAMÓN PUEBLA

    2015-03-01

    Full Text Available La división de un área natural protegida en zonas de manejo es un proceso arduo y complejo, para lo cual es necesario un sistema de evaluación y clasificación de la superficie del territorio en cuestión que permita el reconocimiento en el terreno de los sitios donde se llevarán a cabo las acciones para la protección y el manejo de los valores y recursos del área. El presente trabajo propone una guía metodológica que describe, analiza y privilegia como soporte teórico-metodológico la Geoecología de los Paisajes como vía para llegar a la propuesta de zonificación funcional de un Área Natural Protegida terrestre, partiendo de la delimitación, clasificación y cartografía de las unidades de paisaje con el empleo de los Sistemas de Información Geográfica; el análisis de algunas de las propiedades sistémicas de los paisajes y el cálculo de indicadores como naturalidad, heterogeneidad, peligro, estabilidad y sensibilidad entre otros, así como la evaluación de los potenciales y los conflictos de uso como parte del diagnóstico, permitirá realizar la propuesta de zonificación funcional con una visión integral del territorio y determinar para cada zona y subzona las acciones a desarrollar para mitigar los impactos, atenuar o eliminar las amenazas, mejorar la salud de los objetos de conservación y proteger los valores en cada una de las áreas identificadas con problemas.The division of a protected natural area in managed territories is a difficult and complex process for which an assessment and classification system of the surface of the territory, allowing the recognition of the places, where actions to protect the manage values and the resources of the area will be carried out, is necessary. This paper proposes a methodological guide, describes, assesses and favors, as a theoretical and methodological medium, the Geoecology of Landscapes as a means to reach the functional zoning proposal of a terrestrial protected area from

  16. Brazilian competition advantages in the petroleum and natural gas area. Suitability of a national policy for the sector; Vantagens competitivas brasileiras no setor de petroleo e gas natural. Conveniencia de uma politica industrial para o setor

    Energy Technology Data Exchange (ETDEWEB)

    Zamith, Regina; Santos, Edmilson Moutinho dos; Faga, Murilo Werneck [Sao Paulo Univ., SP (Brazil). Inst. de Eletrotecnica e Energia

    1998-07-01

    Albeit it is recognized the economic benefits that nay follow the opening process of the Brazilian oil and natural gas industry, which should experience a fast expansion with the arrival of national and international private capitals, this work tries to discuss about the capacity of Brazil to sustain this growth and obtain the maximum economic development out of the exploration of its oil and gas reserves. Starting from the concept of National Competitive Advantage, according to Michael Porter's model, from the University of Harvard, it is analyzed some necessary aspects for Brazil to develop a healthier and more competitive oil nad natural gas industry. The work discussed on the convenience of developing a new industrial policy, allowing to the country to protect its national interests without creating old forms of obsolete protectionism. (author)

  17. AS INFLUÊNCIAS DA FILOSOFIA NATURAL E DA NATURPHILOSOPHIE NA CONSTITUIÇÃO DO DARWINISMO: ELEMENTOS PARA UMA FILOSOFIA DA GEOGRAFIA FÍSICA MODERNA

    Directory of Open Access Journals (Sweden)

    Antonio Carlos Vitte

    2009-06-01

    Full Text Available Esse trabalho argumenta que a teoria da evolução de Charles Darwin sofreu forte influência da naturphilosophie de Schelling e Hegel, representando um avanço positivo nas concepções de teleologia da natureza. Fortemente influenciado pelas obras de Alexander von Humboldt, de Werner e pelas pesquisas no campo da paleontologia, a Teoria da Evolução, concebeu a transformação dos organismos e a sua especiação a partir determinantes geográficos e temporais. Ideologicamente influenciado por Lyell, que acreditava na hipótese da vera causa, Darwin relegou a matriz espacial e concentrou suas argumentações nas mudanças temporais, basicamente climáticas, como determinante da evolução. Os impactos da teoria da evolução atingem tanto o campo da geografia física, quanto da geografia humana, influenciando fortemente na postura metodológica das pesquisas geográficas, mas chamando a atenção para a complexidade das relações entre o espaço e tempo que estão em constante mudança.

  18. Proposal for data acquisition system of gas chromatograph and natural gas transfer custody via web; Proposta para um sistema de aquisicao de dados de cromatografia e medicao fiscal de gas natural via web

    Energy Technology Data Exchange (ETDEWEB)

    Santana, Jose Paulo C.; Guimaraes, Marcelo F.; Zeitoune, Rafael J. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2005-07-01

    In this paper, is presented a proposal of a Chromatograph and Transfer Custody Measurement Data Acquisition System through Web, complementary to the SCADA System, responsible for control and monitoring PETROBRAS Gas Pipelines, intended to comply with the requirements of the Gerencias de Qualidade e Medicao (MQD) and Planejamento Integrado da Logistica (PCL) from PETROBRAS Gas e Energia, regarding the evaluation of the quality of the natural gas that is being commercialized, as well as its billing. (author)

  19. Analysis of the natural gas utilization for energy cogeneration in a sugar and alcohol plant; Analise da utilizacao de gas natural para cogeracao de energia em uma usina de acucar e alcool

    Energy Technology Data Exchange (ETDEWEB)

    Uchoa, Thales B.; Campitelli, Flavio M.; Mashiba, Marcos H.S.; Dib, Fernando H.; Maia, Cassio R.M.; Ramos, Ricardo A.V. [UNESP, Ilha Solteira, SP (Brazil). Faculdade de Engenharia. Dept. de Engenharia Mecanica]. E-mails: thales@dem.feis.unesp.br; fmcampitelli@dem.feis.unesp.br; mashiba@dem.feis.unesp.br; fhdib@aluno.feis.unesp.br; cassio@dem.feis.unesp.br; ramos@dem.feis.unesp.br

    2006-07-01

    This article analyses the possibility of using natural gas as complementary fuel in sugar cane and alcohol plants, nearby the gas pipeline, for increasing the energy quantity for commercialization, and also for allowing the operation during the whole year. A thermodynamical study is done and the technical and economic viability is performed for various configurations involving the modification of the traditional plants existent in that plant for allowing the combined use of gas.

  20. Urban index modelling for forecasting of channeled natural gas market: an example in Sao Paulo metropolitan region; Modelagem de indicadores urbanos para previsao do mercado de gas natural canalizado: um exemplo na regiao metropolitana de Sao Paulo

    Energy Technology Data Exchange (ETDEWEB)

    Massara, Vanessa Meloni; Faga, Murilo Tadeu Werneck; Udaeta, Miguel Edgar Morales [Universidade Sao Paulo (USP), SP (Brazil). Programa Interunidades de Pos Graduacao em Energia]. E-mail: vmassara@iee.usp.br; murfaga@iee.usp.br; udaeta@pea.usp.br

    2006-07-01

    This paper aims to present a systemic model for analysis of the expansion and grow up of the natural gas distribution pipeline in a city. This methodology integrates the understanding of the urban dynamics to the strategies of expansion in the natural gas distribution network, through the grouping of information such as family income, demographic density and construction area, percentage of land use, number of households as well as commercial, service and industrial establishments, number of real state as well as indicative information released by the Urban Plan of the city regarding the increments in the peripheral districts. Relating the gas consumption esteemed by each type of land occupation and the cost for expanding the gas distribution network, the model will indicate, for each neighborhood, the viability of implementing a gas network as well as the places with potential for growing density in the existing gas distribution system. The aim is to propose an integration of aspects of city dynamics and new energy source development, taking the advance of natural gas in Sao Paulo Metropolitan area as a specific case study. Through the analysis of highly industrialized, residential and commercial suburbs of the City of Sao Caetano do Sul, the importance of urban parameters in the decision making process for network expansion is identified. (author)

  1. Brazilian industry of natural gas: criteria for definition of relevant markets concerning the defense of competition; Industria brasileira do gas natural: criterios de definicao dos mercados relevantes para efeito de defesa da concorrencia

    Energy Technology Data Exchange (ETDEWEB)

    Mano, Gustavo; Tiryaki, Gisele Ferreira [Universidade de Salvador (UNIFACS), BA (Brazil)

    2008-07-01

    A key point in the examination of the legality of antitrust practices is the delimitation of the relevant markets where the economic relations object of the analysis take place. This is the basis for the evaluation of the market power of the agents involved and the possible harm to competition they may cause. This work offers a study of the criteria for the determination of the relevant market in the scope of the natural gas industry in Brazil. It aims at identifying the performance of the agencies taking part in the Brazilian Antitrust System (SBDC) with regards to the examination of the related antitrust practices. These agencies work in connection with the National Petroleum, Natural Gas and Biofuels Regulatory Agency (ANP), which is responsible for issuing technical reports on the subjects related to its area of competence. The analysis presented here has the main goal of verifying if the most important technical, operational and legal aspects are being adequately considered by the SBDC and ANP in the definition of the relevant markets as a basis for the judgment of the antitrust practices, and if they are coherent with the principles for fostering economic competition. The results points out that, despite the successful cooperation between the SBDC and the ANP, there are the used definition of the relevant markets for the natural gas industry still needs refinement. (author)

  2. Performance comparison between turbine and ultrasonic flowmeters for gas pipelines; Comparacao de desempenho entre medidores de vazao para gas natural tipo turbina e tipo ultra-sonico

    Energy Technology Data Exchange (ETDEWEB)

    Roz, Fabio da; Palhares, Julio Cesar de M.; Nunes, Marcus Vinicius B.; Pinto, Nancy Flora Alves [TBG - Transportadora Brasileira Gasoduto Bolivia-Brasil, S.A., Rio de Janeiro, RJ (Brazil)

    2005-07-01

    The performance analysis of natural gas flowmeters Turbine and Ultra-sonic Type installed in a same stream connected to a flow computers for 18 months it allowed to identify errors between Ultra-sonic flowmeter and Turbine flowmeter. All measurements of the measured volumes during test period were stored in flow computers and they were tabulated for analysis and study. The measured values were compared making possible analysis of measurement errors between the two instruments. All maintenance events of the measurement system in subject were registered, allowing analysis of all fails occurred during the test period. (author)

  3. Analysis and characterization of storage, transport and re gasification for distribution of liquid natural gas (LNG); Analise e caracterizacao do armazenamento, transporte e regaseificacao para distribuicao do GNL

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Erica Cristina de; Simoes-Moreira, Jose Roberto [Universidade de Sao Paulo (USP), SP (Brazil). Dept. de Engenharia Mecanica. Lab. de Sistemas Energeticos Alternativos], e-mail: erica.carvalho@poli.usp.br, e-mail: jrsimoes@usp.br; Udaeta, Miguel Edgar Morales [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia], e-mail: udaeta@iee.usp.br

    2008-07-01

    This article approach the evaluation and technical characterization os storage systems, transport and re gasification in the liquid natural gas (LNG). Methodologically the evaluation is performed of each system divided in data assessment and technical evaluation, where evaluations are mainly focused to the technical evaluation of the storage, transport and re gasification of the GNL distribution system in the retail store. The paper presents the re gasification 'cold' retail store, where it is possible to proceed the association with some local industry through the uses of cooling systems.

  4. Primera Aproximación Para El Aprovechamiento Y Generación De Energía Con Gas Natural Desde Mecanismo De Desarrollo Limpio (MDL

    Directory of Open Access Journals (Sweden)

    Diego Rosas Cadena

    2015-01-01

    Full Text Available Este artículo presenta un panorama referente aplicaciones de Mecanismos de desarrollo limpio (MDL a nivel regional y nacional enfocado a la recuperación de energía. Con base en este panorama se presenta una aproximación del desarrollo de proyectos de aprovechamiento y generación  de energía a partir del uso de gas natural y su elegibilidad como MDL, tomando como base las metodologías existentes aprobadas por la Convención Marco de las Naciones Unidas (CMNUCC.

  5. La doctrina de Tomás de Aquino sobre la analogía como recurso para el conocimiento natural de dios. una meditación filosófica sobre sus límites y alcances

    Directory of Open Access Journals (Sweden)

    Lucero González Suárez

    2015-06-01

    Full Text Available El propósito de este ensayo consiste en reflexionar sobre el fundamento ontológico de la doctrina de Tomás de Aquino sobre analogía, con el fin de señalar sus alcances y límites para el conocimiento natural de Dios. En el primer apartado se reflexiona sobre la analogia entis. En el segundo, se define la analogía y sus tipos. En el tercero, se explica que a través de la analogía es posible acceder al conocimiento indirecto de Dios. En el cuarto, se plantea la pregunta acerca de cuál es el Dios al que permiten acceder las pruebas de la existencia de Dios basadas en la analogía, con el fin de argumentar que, como sostiene San Juan de la Cruz, entre las criaturas y Dios hay una infinita desemejanza, motivo por el cual, si bien es cierto que la analogía permite a la teodicea el conocimiento de Dios como causa, no es un medio proporcionado para el conocimiento de su ser sobrenatural. El artículo concluye con la exhibición de los límites del pensamiento analógico para el conocimiento esencial de Dios: de la trascendencia y el misterio que envuelven su presencia. La tesis a demostrar es que el conocimiento analógico de Dios es imperfecto e incompleto, pero no falso.

  6. Particle swarm optimization for the design of natural gas networks; Otimizacao por nuvens de particulas para o problema da configuracao do tracado de redes de distribuicao de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Goldbarg, Elizabeth Ferreira Gouvea; Goldbarg, Marco Cesar [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Dept. de Informatica e Matematica Aplicada; Monteiro, Silvia Maria Diniz [ Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2008-07-01

    This work presents the application of Particle Swarm Optimization (PSO) for the design of natural gas networks. In order to understand the relevance of the problem and also the approach of solution, the problem is defined and modeled by the Prize Collection Steiner Tree Problem. (PCSTP). The fundamentals of the metaheuristics is presented and the state-of-art for PCSTP is discussed. The algorithm developed was tested for known and very used instances of literature that will be also presented. The results obtained were comparable to other results. (author)

  7. Small-scale electricity generating facilities from natural gas : a measure to mitigate the greenhouse effect; Microgeneracion de energia con gas natural: una medida efectiva para mitigar el cambio climatico

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez, A. M.

    2002-07-01

    The forthcoming liberalization of the gas and electricity markets in Europe, in conjunction with the increase of the global energy consumption in the near future are enabling the development of natural gas alternatives to traditional large-scale centralized power plants. They emerged from research suggesting that the use of small-scale electricity generating facilities dispersed throughout the electrical network, provides the electricity system with measurable technical, economic and environmental benefits. In this sense, the distributed generation powered by cogeneration systems offers the biggest measure to mitigate the greenhouse effect due to the carbon dioxide. (Author)

  8. Geotecnologias como suporte para análise da vegetação natural na sub-bacia hidrográfica do Rio Gavião (1988 a 2015

    Directory of Open Access Journals (Sweden)

    Carlos Magno Santos Clemente

    2017-06-01

    Full Text Available O histórico de ocupação da sub-bacia do rio Gavião passou por transformações socioeconômicas expressivas nos últimos 30 anos. Desse modo, preocupações com preservação ou recuperação da cobertura vegetal influência, positivamente, na manutenção do ciclo hidrológico da sub-bacia. A presente pesquisa tem como objetivo analisar a modificação da vegetal natural entre os anos de 1988 a 2015 na sub-bacia hidrográfico do rio Gavião (semiárido brasileiro. Foram utilizadas as como suporte técnico o sensoriamento remoto, Processamento Digital de Imagens - PDI e o Sistema de Informações Geográficas - SIG (satélites landsat 5 e landsat 8. Os resultados indicam redução da cobertura vegetal de 751,69 km², entre os anos de 1988 a 2015. Também, manchas de desmatamento em áreas de nascentes, na parte alta da rede de drenagem e no dessegue do canal principal. Assim, a presente pesquisa chama atenção para os efeitos da mudança da vegetação natural para outros usos da terra (solo exposto, plantio, entre outros, a concentração do desmatamento em áreas de fragilidade ambiental.

  9. The advance of natural gas market using urban information: case study in Sao Paulo city (Brazil); Ampliacao de mercado para o gas natural utilizando informacoes urbanas: estudo de caso dos distritos paulistanos

    Energy Technology Data Exchange (ETDEWEB)

    Massara, Vanessa M.; Faga, Murilo T.W.; Santos, Edmilson M. [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia. Programa Interunidades de Pos-Graduacao em Energia (PIPGE)

    2004-07-01

    Considering the importance of the city of Sao Paulo for the Brazilian natural gas market, the aim of this paper is to propose an analytical methodology that integrates the understanding of the urban dynamics to the strategies of expansion in the natural gas distribution network, characterizing the gas consumption possibilities and attractiveness for each of the 96 districts composing the city. The methodology is developed through the grouping of information such as family income, demographic density and construction area, percentage of land use, number of households as well as commercial, service and industrial establishments, number of real state as well as indicative information released by the Urban Plan of the city regarding the increments in the peripheral districts. Relating the gas consumption esteemed by each type of land occupation and the cost for expanding the gas distribution network, the model will indicate, for each neighborhood, the viability of implementing a gas network as well as the places with potential for growing density in the existing gas distribution system. On this paper, examples of essential information that compose the methodology are presented for three districts: Itaquera, Moema and Tatuape, which have different socio-economic and geographical profiles. (author)

  10. Development of a pilot fluidized bed combustion to NOx reduction using natural gas: characterization and dimensioning; Desenvolvimento de um combustor piloto a leito fluidizado para reducao de NOx usando gas natural: caracterizacao e dimensionamento

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Douglas A.; Lucena, Sergio [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2004-07-01

    At the present time, the operation of combustion systems and the design of combustors continue being important problems in the Engineering, and don't involve just the size increase of combustors, but also changes of characteristics in the details of projects. The combustors applications are directly related to the needs, like: material transformation for heating, drying or incineration; and all have the inconvenience of emanating of pollutant gaseous (such like NOx). In combustion systems of gases, NOx is basically created in the reaction between nitrogen and oxygen to high temperatures ({approx} 1200 deg C). Below such conditions, the contribution of thermal NOx is recognisably small. The efficient reduction, safe control and economical elimination of pollutant emissions in the systems of burning are the main focuses of environmental legislation and concern to several industrialized countries, besides Brazil. Furthermore, in appeal at the Environmental Laws and at the rising consumption of combustible gases (Natural Gas), new technologies more attractive and economically viable have been studied, for example the combustion systems in fluidized bed. In this kind of system is possible to obtain high combustion efficiency at low temperatures ({approx} 900 deg C) with NOx reduction. In this work is intended of characterizing and dimensioning an industrial fluidized bed combustor that uses Natural Gas like feedstock in the combustion system, with smaller amounts of emitted NOx. (author)

  11. Software for the decision making support on the design of natural gas distribution networks; Software de apoio a decisao para o projeto de rede urbanas de distribuicao de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Goldbarg, Marco C.; Goldbarg, Elizabeth F.G. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil); Campos, Michel F. [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    This work presents a computational system to aid the decision making process of installing new networks to distribute natural gas in an urban area. The system is called POM-DIGAS. The purpose of the software is to optimize the design of natural gas distribution networks. The general optimization problem comprises two combinatorial problems. The first one refers to the definition of the network layout. In this problem the objective is to minimize the total length of the network. The second combinatorial problem considers the pipe size optimization in which one must choose the diameters of the pipes regarding the demand requirements. POM-DIGAS is a composite of models and algorithms developed to tackle the two combinatorial problems. Furthermore, the software has a geographic information mode, a tool to automatically acquire several types of data concerning the project and a mode with distinct flow equations in order to allow the utilization of different methodologies for computing the network flows. The system was applied to a case study developed for the city of Natal, Rio Grande do Norte. This work was supported by RedeGasEnergia, FINEP and PETROBRAS. (author)

  12. Diploglossus fasciatus Gray, 1831 (Diploglossa: Anguidae. Primer registro para el Parque Nacional y Área Natural de Manejo Integrado Madidi

    Directory of Open Access Journals (Sweden)

    Enrique Domic

    2015-05-01

    Full Text Available Estado Plurinacional de Bolivia, Departamento de La Paz, Provincia Franz Tamayo, Municipio Apolo, Parque Nacional y Área Natural de Manejo Integrado Madidi, TCO Pueblo Indígena de San José de Uchupiamonas, Campamento Corazón del Madidi, cerca de encuentro al arroyo Eslabón y río Tuichi (14°32'32.58"S 67°45'44.91"W; 288 m.s.n.m.. Colectores: Jesús Martínez y Mileniusz Spanowicz. 15 de Marzo del 2013. Macho (SVL: 180 mm; LT: 379 mm; Peso: 130 g. Depositado en la Colección Boliviana de Fauna (CBF 3699, La Paz, Bolivia.

  13. Photovoltaic systems for the nature parks of Rio de Janeiro municipality; Sistemas fotovoltaicos para os parques municipais da cidade do Rio de Janeiro, RJ

    Energy Technology Data Exchange (ETDEWEB)

    Galdino, Marco Antonio; Silva, Patricia de Castro da [Centro de Pesquisas de Energia Eletrica (CEPEL), Rio de Janeiro, RJ (Brazil)], e-mails: marcoag@cepel.br, patricia@cepel.br; Masi, Monica di [Secretaria Municipal de Meio Ambiente da Cidade do Rio de Janeiro (SMAC/RJ), RJ (Brazil)], e-mail: monica.masi@smac.rio.rj.gov.br

    2010-07-01

    This paper presents the current status of the project run by the Municipality of Rio de Janeiro, though its Secretary for the Environment, aiming the implantation of photovoltaic (PV) systems for electrification of the Nature Parks of the City. Relevant characteristics of 6 parks, which are to receive first the PV systems, are discussed here, including Parks Prainha, Dois Irmaos, Chico Mendes, Marapendi and Bosque da Barra, as well as the PV systems to be installed in each park. The projects include stand-alone and grid-connected PV systems, and plans to install a total power of more than 60kWp of PV panels. This activity is considered innovative and a part of the preparation of the City for important international events of the coming years: World Cup 2014 and Olympic Games 2016. (author)

  14. Propuesta de un Diseño Agroecológico para un Parque Natural Multifuncional (Finca Agualinda, Vereda Olarte en Usme, Bogotá D.C. - Colombia Proposal of an Agroecologic Design for a Multifunctional Natural Park (Agualinda Farm, Olarte County, in Usme, Bogotá D.C. - Colombia

    Directory of Open Access Journals (Sweden)

    Sandra Milena García Peña

    2012-06-01

    Full Text Available Resumen. Las dificultades del bosque andino son de variada índole, por ello es necesario un estudio sistémico para solucionar problemas de tipo económico, social, político, tecnológico y ambiental en la región. Se muestran las potencialidades de la creación de un parque natural multifuncional (PNM, el cual se presenta como una oportunidad para la solución de las limitantes encontradas.La metodología seguida fue la aplicación del análisis PESTA, la matriz Vester, el procedimiento de impacto cruzado y la matriz IGO,de la cual resultan las variables que se califican. Con esta información se propone un árbol de problemas y de objetivos para un planteamiento de los escenarios posibles. La estrategia seleccionada consiste en una propuesta para el diseño de un PNM con especies endémicas colombianas de bosque altoandino y páramo. Se sustenta con la metodología seguida, el entendimiento de la problemática de la región y la identificación de las variables que deben impactarse para solucionarla.Abstract. This paper reveals the potential of creating a Multifunctional Natural Park (MNP. The difficulties of the Andean forest are of various kinds; for this reason, is needed to address a systematic study in order to propose answers to economic, social, political, technological and environmental affectations. The methodology was to apply PESTA analysis, priorization by application of Vester's matrix, the cross-impact procedure, and the importance and gobernability priorization of which results the variables that are scored. With this information is designed a tree of problems and objectives for a possible scenario useful for a subsequent selection of strategies. The choise way, is a proposal for sketch a MNP with endemic species, which is presented as an opportunity to solve the problems found. On the other hand, is sustained that the methodology employed is effective for understanding of region limitations and the identification of variables

  15. NUMERIC SOLUTION FOR OBTENTION OF THE LINE FLOW PROFILE IN NATURAL CHANNELS SOLUÇÃO NUMÉRICA PARA A OBTENÇÃO DO PERFIL DA LINHA D’ÁGUA EM CANAIS NATURAIS

    Directory of Open Access Journals (Sweden)

    Luiz Fernando Coutinho de Oliveira

    2007-09-01

    Full Text Available

    The aim of this research was to obtain the line flow profile as affected by a weir installed on a natural channel. The channel flow was measured through a suppressed weir. In order to obtain the channel geometric parameters a profile cross section survey was performed at several points, adjusting equations of the power type to describe the top width and the flow area as a function of depth. To obtain the line flow, the numeric solution of Bernoulli equation was used through the finite differences technique. The line flow profile was similar to that observed in the field, suggesting the adequacy of the proposed methodology.

    KEY-WORDS: Open channel; gradually varied flow; backwater curve.

    O presente trabalho teve como objetivo a obtenção do perfil da linha d’água do remanso provocado pela instalação de um vertedor em um canal natural. A vazão do canal foi medida por um vertedor sem contração lateral instalado no canal utilizado neste estudo. Para a obtenção dos parâmetros geométricos do canal, procedeu-se ao levantamento do perfil da sua seção transversal em vários pontos. Com os dados obtidos, ajustaram-se as equações do tipo potencial para descrever a largura do espelho d’água e a área molhada em função da profundidade. Para a obtenção do perfil da linha d’água, empregou-se a solução numérica da equação de Bernoulli pela técnica das diferenças finitas. O perfil da linha d’água simulado aproximou-se do observado no campo, o que confere adequação à metodologia proposta neste trabalho.

    PALAVRAS-CHAVE: Conduto livre; escoamento gradualmente variado; curva de remanso.

  16. Project of multiple controller models for the maintenance of air/fuel ratio in natural gas internal combustion motors; Projeto de controladores multiplos modelos para manutencao da relacao ar/combustivel em motores de combustao interna movidos a gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Freitas Junior, Fernando Sousa e; Fleury, Agenor de Toledo [Sao Paulo Univ. SP (Brazil). Escola Politecnica. Dept. de Engenharia Mecanica]. E-mails: ffreitas@usp.br; agfleury@ipt.br

    2006-07-01

    The objective of this work is the study of advanced control techniques for the reduction of pollutant gases generated by internal combustion engines powered by natural gas. In this paper three techniques are applied to control the fuel injection and the ignition timing: the Generalized Predictive Control (GPC), the Linear Quadratic Regulator (LQR) and H{infinity} Control by Linear Matrix Inequalities (LMI). To each one of those techniques were developed a multiple model structure seeking to include the vast operation region of the engine. The controller's performance is measured by the efficiency in maintaining the fuel/air ratio around 1% of maximum deviation in relation to the stoichiometric value. The results show the possibility of controlling pollutant emission generated by this kind of engine to conform to international emission standards, improving life quality. (author)

  17. Comparação de diferentes abordagens para avaliação da incerteza na cromatografia gasosa do gás natural Comparison of different approaches to evaluate the uncertainty of gas chromatography for natural gas

    Directory of Open Access Journals (Sweden)

    Elcio Cruz de Oliveira

    2009-01-01

    Full Text Available The evaluation of uncertainty associated with an analytic result is an essential part of the measurement process. Recently, several approaches to evaluate the uncertainty in measurement have been developed. Here, the gas chromatography assay uncertainty for natural gas is compared by some of these approaches: the guide to the expression of uncertainty in measurement (GUM approach, top-down approach (reproducibility estimate from an inter-laboratory study, Barwick & Ellison (data from validation, study of variability and fuzzy approach. The comparison shows that GUM, Barwick & Ellison and fuzzy approaches lead to comparable uncertainty evaluations, which does not happen with the top-down approach and study of variability by the absence of data normality.

  18. Valoración del medio natural por "unidades valle" en Puebla de Lillo (León para actividades genéricas y específicas

    Directory of Open Access Journals (Sweden)

    Alonso Herrero, E.

    1993-12-01

    Full Text Available The capability of different land units for supporting different activities in the Southern Cantabrian mountains has been assessed through the quantification of various areal parameters of the natural environment.
    The analysis has been carried out by means of activities/parameters relational matrixes. Twenty one "types" corresponding to five environmental parameters were considered. A two-step system of capability assessment was used, evaluating first seven generic activities and then five specific ones.

    [es] La cuantificación territorial (planimetría de diferentes parámetros del medio natural del término municipal de Puebla de Lillo, en la vertiente sur de la Cordillera Cantábrica, ha permitido la valoración de la capacidad de este medio natural frente a la posible implantación de diferentes actividades.
    Esta valoración se basa en la utilización de matrices de relación entre los elementos y tipos del medio natural frente a las actividades, eligiéndose diferentes tipos de parámetros pertenecientes a 5 elementos del medio natural.
    En primer lugar se ha realizado una valoración para seis actividades genéricas, consideradas éstas como el conjunto de varias actividades específicas relacionadas estrechamente entre sí. De este modo se establece una doble jerarquización en la capacidad de uso para las distintas "unidades valle". Posteriormente se muestra como ejemplo la valoración de cinco actividades específicas y se establece la capacidad de acogida para éstas.
    [fr] La capacité d'accueil pour de différentes activités de la Cordillère Cantabrique (versant méridional a été évaluée par la quantification des divers paramètres du moyen naturel.
    Le rapport entre les éléments et les types du moyen naturel et les activités, a été étudié sur l'analyse matriciel, dans lequel sont considérés différentes types de paramètres qui appartiennent à 5 éléments de l'environnement naturel

  19. Natural and artificial radioactivity in commercial food for domestic animals; Avaliação da radioatividade natural e artificial em rações comerciais para animais domésticos

    Energy Technology Data Exchange (ETDEWEB)

    Cavalcante, Fernanda

    2017-07-01

    The levels of natural radioactivity throughout the planet and their eventual consequences are studied by Environmental Radioprotection. Over the past years, the international agencies concerned with radiation protection have debated over the practices conducted so far, regarding the protection of the fauna and ora, which believed that the recommendations implemented for human beings assured that other species were also protected. Thus, assessments of the activity concentration of different radionuclides in the environment, as well as the absorbed doses for species from different ecosystems, due to internal and external exposures, are needed. Brazil holds the second largest dog and cat population in the world and annually produces over 2 million tons of feed. The present work has investigated the radioactivity levels in commercial brands of dry dog and cat food, using high resolution gamma spectrometry. The results have shown activity concentrations for artificial radionuclides below the detector's Minimum Detectable Activity and also, low concentration levels for the natural radionuclides, varying from 0,9 ± 0,3 Bq/kg up to 5,1 ± 0,7 Bq/kg for {sup 226}Ra, from 1,2 ± 0,4 Bq/kg up to 11,1 ± 1,0 Bq/kg for {sup 232}Th and from 156 ± 7 Bq/kg up to 410± 19 Bq/kg for {sup 40}K. In order to verify the mineral content in pet food, EDXRF technique was applied and, using multivariate statistics, correlations between the mineral and radionuclide content were verified. The good correlation observed between concentrations of {sup 226}Ra, {sup 232}Th and calcium could be associated with meat and bone our used in feed manufacturing. The internal dose for some organs were inferred by Monte Carlo method and the results were no higher than 1 μGy/day. In summary, results have shown that the activity levels found in the pet food are low enough to conclude that the brands evaluated carry no radiological risks for the animals that consume them. (author)

  20. SALUD DIAGNOSTICO DE LA CIUDAD DE PARQUE NATURAL DE LONG POND: SUBVENCIONES PARA LA GESTIÓN Y ADMINISTRACIÓN

    Directory of Open Access Journals (Sweden)

    Rodrigo Barros Sontag

    2013-01-01

    Full Text Available This study aimed to determine what were the health problems that the Municipal Park in Long Pond Aquidauana - MS faces. Before this proposal sought to provide subsidies for the management and conservation management of this unit is to identify the points of pollution, analyze the water quality of the study site and to rank them according framing certified standards with the idealization of tools as support for management and administration. As for the idea that this conservation unit never came to pass, and there was discharge of sewage "in natura" in its waters, and favored increasing contamination by solid and liquid waste resulting from the urbanization of its surroundings. And still be considered one of the main tourist attractions and recreational services for the local population this issue deserved attention of municipal administrative staff, research institutes, environmental control and general population. So held health diagnosis and identified the points of pollution, analyzed the quality of its waters through methods like electrometric, the titration. It was evident that urbanization occurs when disorderly cause environmental degradation. For this fact the Long Pond Park suffers from solid waste disposal, both domestic and construction and pruning of trees beyond the influence of the open sewer. Data for pH, DO, water temperature were collected in situ by multiparameter probe Hanna NI 9828 and turbidity was obtained by turbidimeter Alkafit bench. Analysis of Nitrate, Nitrite, Total Nitrogen, Total Phosphorus were performed by the spectrophotometric method. The diagnosis of health of the Lagoon Nature Park Municipal Long proved valuable because it gave grants to a discussion of what is contaminating the park and saw useful tools for future development of a management plan.

  1. The natural background to the quality of groundwater: implications for the implementation of the Framework Water Directive in Europe; El fondo natural de la calidad del agua subterranea: implicaciones para la aplicacion de la Directiva Marco del Agua en Europa

    Energy Technology Data Exchange (ETDEWEB)

    Manzano, M.; Custodio, E.; Nieto, P.

    2003-07-01

    The most recent water legislation issued world-wide require to establish a scientifically based definition for groundwater baseline quality, which is simple to use and nimble for politicians and managers. Derived from the European projects Baseline, groundwater baseline has been defined as the range of concentrations of a given element, species or chemical substance present is solution, being derived from natural geological, biogical, or atmospheric sources. The terms of this definition conforms the methodology to use to accomplish European water laws requirements: 1) to establish groundwater baseline for the European water bodies within next years: 2) to study hydrochemical trends and to distinguish baseline trends from pollution trends; 3) to inquiry the causes of pollution trends, set up restoration programs and monitor their success by determining the start of chemical trends reversals. The methodology used in the European project BaSeLiNe to answer these questions and the main methodological and conceptual conclusions are used to illustrate the need for an accurate determination of groundwater baseline. (Author) 4 refs.

  2. Monitoring and prediction of geotechnical and environmental risks for security in natural gas transportation; Monitoramento e previsao de riscos geotecnicos e ambientais para seguranca no transporte do gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Chamecki, Paulo R.; Ligocki, Laryssa P.; Andrade, Heber A.C.; Manzolli, Andre; Horbatiuk, Borys W.D. [LACTEC - Instituto de Tecnologia para o Desenvolvimento, Curitiba, PR (Brazil); Strieder, Adelir J.; Quadros, Telmo F.P.; Buffon, Sergio A.; Stupf, Leonardo; Bressani, Luiz A.; Bica, Adriano V. Damiani [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil); Schiafino, Antonio V.; Bastos, Cesar B. [Fundacao Universidade Federal do Rio Grande (FURG), RS (Brazil); Radu, Marcos S.; Nascimento Filho, Lenart P. [PETROBRAS, Rio de Janeiro, RJ (Brazil); Santoro, Alcides [Centro de Tecnologias do Gas (CTGAS), Natal, RN (Brazil); Vasconcellos, Carlos R.A.; Oliveira, Hudson R. [TBG - Transportadora Brasileira Gasoduto Bolivia-Brasil S.A., Rio de Janeiro, RJ (Brazil)

    2004-07-01

    In order to take care of the consumption issues, often the bands of pipelines have to cross regions that do not present ideal conditions in terms of geotechnical and geologic characteristics. The present work describes a research in progress, involving a partnership between LACTEC, UFRGS, RedeGasEnergia and FINEP, that aims the development of a methodology for instrumentation and remote monitoring of places which present risks to the infrastructure of the gas-lines and the environment, due to geological and geotechnical conditions, as well as the definition of these places. The methodology is practically concluded and will be applied in the place defined for the case study in natural gas Bolivia-Brazil gas-line. Satellite images are being used, along whit computational modeling, geophysical methods, exploratory boreholes and field and laboratory tests, for the definition of points of risk. In the remote monitoring, besides a data communication system, residual stress test of the pipelines, strain gauges and automatic instruments, inclinometers, piezometer and pluviometers are being used. (author)

  3. Marigold (Tagetes erecta L. as an attractive crop to natural enemies in onion fields Cravo-de-defunto (Tagetes erecta L. como cultura atrativa para inimigos naturais em cultivo de cebola

    Directory of Open Access Journals (Sweden)

    Luís Cláudio Paterno Silveira

    2009-12-01

    Full Text Available Onion is the third most grown vegetable crop in São Paulo state, Brazil. Organic onion farming is expected to increase in the state due to the increasing demand. Pest management in organic onion farming is based on plant extracts with insecticide effects. However, the efficacy of such plant extracts has not been proved yet, and it was observed that they do negatively affect natural enemies. Plants surrounding onion fields, and that are attractive to natural enemies, may be a good option to farmers, since they may lead to increased diversity of arthropod species and, consequently, the natural control of pest populations. This study deals with the effect of marigold plants as a resource plant to natural enemies in onion fields. The experiment was set in a certified organic farm using marigold rows at a center of an onion field. Samples were taken from marigold and the onion plants 5 m (near and 30 m (far from the flowering strips. Higher numbers of arthropod pests were observed in onion plants 30 m from the marigold strip, while higher numbers of predators and parasitoids were found at 5 m distance. Species richness and Shannon's diversity index were higher at 5 m from marigold. Therefore, marigold rows next to onion fields resulted in higher number of entomophagous species, potentially enhancing the natural control of onion pests. In the study field, marigold strips may be an alternative to crop sprays for organic control of onion pests.A cebola é a terceira hortaliça mais cultivada em São Paulo, cujo cultivo orgânico tende a crescer devido ao grande mercado consumidor existente. O manejo das pragas na cebolicultura orgânica baseia-se nos extratos de plantas inseticidas que, além de terem eficiência não comprovada, podem afetar negativamente os inimigos naturais. A utilização de plantas atrativas a inimigos naturais no entorno dos cultivos de cebola pode ser uma boa opção para os produtores, pois potencialmente aumentam a diversidade

  4. Cogeneration in breweries analysis and simulation of systems for simultaneous generation of power, heat and refrigeration using natural gas; Sistemas de refrigeracao a partir da cogeracao: analise e simulacao de propostas para o caso de cervejarias utilizando gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Gallego, Antonio Garrido

    1998-07-01

    The present work analyses some proposals of cogeneration systems for the simultaneous generation of power, heat and refrigeration in a brewery. The requirements of steam, refrigeration and electricity, as well as the production of beer in a plant of the Antarctica Company, located in Jaguariuna - SP were collected monthly for the year of 1997. Three conceptions of systems using two gas turbines with heat recovery steam generator were then proposed to meet the surveyed demand. The proposals differ in the refrigeration system: the first one uses a traditional ammonia compression system while the second uses an ammonia absorption system, the third proposal is a combination of the compression and absorption systems. These proposals are compared to the present configuration which purchases electricity from the Public Utility for power and refrigeration (using an ammonia compression)system, and fuel oil to generate steam for process heat. The technical, economical and environmental feasibility of the proposals, as well as of the present configuration are discussed on the basis of mass balances, energy balances (first law of Thermodynamics), exergy fluxes (second law analysis), operational and capital cost, based on simulation of the performance of each configuration proposed to meet the monthly electricity, steam and refrigeration requirements for the referred plant. The turbines were chosen so as to meet the peek energy demand of the plant and two cases were simulated for each proposal: turbine operational meets only the demand of the plant and turbine operates at full load, selling electricity for the Public utility. Results obtained show that the current operational costs are higher than any of the proposals presented. The high capital costs of the proposals, though,make them less interesting financially. The simulation of the case of excess electricity to the Public Utility is very attractive, considering the cost of natural gas 3,38 U$/M btu and the fare of 40 U

  5. Cirurgia por orifícios naturais transcolônica: acesso NOTES peri-retal (PNA para excisão mesoretal total Transcolonic natural orifice surgery: peri-rectal NOTES access (PNA for total mesorectal excision

    Directory of Open Access Journals (Sweden)

    Ricardo Zorron

    2010-03-01

    Full Text Available OBJETIVOS: Cirurgia por orifícios naturais tem sido recentemente aplicada em series clínicas para cirurgia abdominal. Apesar de potenciais vantagens do acesso NOTES transcolônico para doenças colorretais, este ainda não havia sido utilizado clinicamente. O presente trabalho descreve a primeira aplicação bem-sucedida de NOTES transcolônico da literatura, em uma nova abordagem de excisão mesoretal total (TME para cancer de reto. MÉTODOS: Foi obtida aprovação de Comitê de Ética em Pesquisa para cirurgias por orifícios naturais, e o paciente assinou termo de consentimento informado. Em um paciente de 54 anos portador de adenocarcinoma de reto, o procedimento de retossigmoidectomia e linfadenectomia, com excisão mesoretal total foi realizada utilizando um acesso posterior transcolônico pouco acima da borda anal. A dissecção mesorretal foi conseguida utilizando um colonoscópio flexível e instrumentos endoscópicos, com assistência laparoscópica. O espécime foi retirado via transanal, e anastomose foi transorificial, com estoma proximal de proteção. RESULTADOS: O tempo operatório foi de 350 min, não ocorrendo complicações operatórias. A evolução pós-operatória foi favorável, e o paciente recebeu alta no sexto dia de pós-operatório com dieta plena. CONCLUSÃO: Este primeiro relato bem sucedido de cirurgia NOTES transcolônica traz potencialmente novas fronteiras de aplicações clínicas na cirurgia minimamente invasiva. O tratamento de doenças colorretais utilizando o novo acesso flexível PNA (Perirectal NOTES Access é uma promissora nova abordagem, paralelamente à laparoscopia e cirurgia aberta, para melhoria do tratamento dos pacientes.OBJECTIVES: Clinical natural orifice surgery has been applied for abdominal surgery in recent years. Despite potential advantages of transcolonic NOTES for colorectal diseases, it was since now not yet clinically applied. The study describes the first successful human

  6. A new method to simulate the hydrological state of soil under natural conditions Um novo método para simular o estado hidrológico do solo em condições naturais

    Directory of Open Access Journals (Sweden)

    Anna-Katharina Wild

    2009-08-01

    Full Text Available Micro, macro and mesofauna in the soil often respond to fluctuating environmental conditions, resulting in changes of abundance and community structure. Effects of changing soil parameters are normally determined with samples taken in the field and brought to the laboratory, i.e. where natural environmental conditions may not apply. We devised a method (STAFD - soil tubes for artificial flood and drought, which simulates the hydrological state of soil in situ using implanted cores. Control tubes were compared with treatment tubes in which floods of 15, 30, 60 and 90 days, and droughts of 60, 90 and 120 days were simulated in the field. Flooding and drought were found to reduce number of individuals in all soil faunal groups, but the response to drought was slower and not in proportion to the expected decrease of the water content. The results of the simulated floods in particular show the value of the STAFD method for the investigation of such extreme events in natural habitats.As micro, macro e mesofaunas no solo respondem frequentemente à variação das condições ambientais, o que resulta em alterações na abundância e na estrutura da comunidade. Os efeitos das alterações nos parâmetros do solo são normalmente determinados com amostras recolhidas no campo e trazidas ao laboratório, ou seja, onde as condições ambientais naturais podem não ser aplicáveis. Criamos um método (STAFD - tubos de amostra de solo para inundações e secas artificiais, que simula o estado hidrológico do solo in situ com núcleos implantados. As amostras de controle foram comparadas com amostras de tratamentos em que foram simuladas inundações de 15, 30, 60 e 90 dias e secas de 60, 90 e 120 dias no campo. Verificou-se que as inundações e a seca reduziram a quantidade de individuos em todos os grupos de fauna de solo, mas a resposta à seca foi mais lenta e não proporcional à redução prevista no teor de água. Os resultados das inunda

  7. Natural gas energy efficiency potential: assessment of useful energy balance and opportunities for ESCOs in Brazil; Potencial de eficiencia energetica para gas natural: analise do balanco de energia util e oportunidades para ESCOs (Empresas de Servico de Conservacao de Energia) no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Aragao Neto, Raymundo Moniz de [Empresa de Pesquisa Energetica (EPE), Rio de Janeiro, RJ (Brazil)

    2008-07-01

    The market for ESCOs in Brazil has a great opportunity, by offering energy efficiency services related to natural gas use. The article presents a revision of ESCO concept and analyses the market potential for this specific segment, based upon data from the Useful Energy Balance. (author)

  8. Development of a methodology and software for analysis of energy and economic feasibility of introducing natural gas facilities in residential an commercial sector; Desenvolvimento de metodologia e de software para analise de viabilidade energetica e economica da introducao de instalacoes para gas natural no setor residencial e comercial

    Energy Technology Data Exchange (ETDEWEB)

    Jesus, Marcos Fabio de; Torres, Ednildo Andrade [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola Politecnica. Lab. de Energia e Gas; Santos, Carlos Antonio Cabral dos [Universidade Federal da Paraiba (UFPB), Joao Pessoa, PB (Brazil). Lab. de Energia Solar; Campos, Michel Fabianski [PETROBRAS, Rio de Janeiro, RJ (Brazil). RedeGasEnergia

    2004-07-01

    With the increasing participation of the natural gas in the world-wide and national energy matrix, beyond the constant search for an alternative source of energy that has an acceptable behavior of the ambient point of view, they become each time more necessary studies to make possible the expansion of the use of this fuel in the diverse energy sectors, such as: Industrial, advertising, residential, to propagate, among others; Of these sectors, the residential one is what more it needs innovations and/or technological adaptations to exert a massive participation in the demand of the natural gas. This work has as objective to establish a methodology adjusted for analysis of the energy and economic viability of the introduction of installations for natural gas in the residential and commercial sector, as well as the implementation of a software that will more facilitate to the taking of decisions of this the confection of the plant low of the enterprise until the choice of the adjusted material for the installation of the tubing, besides showing to the viability technique - economic of the use of the natural gas for supplying all even though the energy necessities of this construction or of its joint participation with the electric energy or with the GLP. The methodology will mainly have support in first and the second law of the thermodynamics, beyond the norms Brazilian techniques that conduct this sector of the civil construction, taking in consideration the fixed and changeable costs of the energy construction of the construction and the involved ones. One expects, on the basis of the literature, that the introduction of installations for natural gas in the residential and commercial sector presents viability economic technique and, increasing with this the demand of this fuel and consequently its participation in the national energy matrix. (author)

  9. Mejorando la Calidad de los Métodos de Solución para Redes de Transporte de Gas Natural mediante Técnicas de Optimización

    Directory of Open Access Journals (Sweden)

    Roger Z Rios Mercado

    2012-07-01

    Full Text Available En este trabajo se estudia el problema de minimizar el consumo de combustible incurrido por las estaciones compresoras en un sistema de redes de transporte de gas natural en estado estable, el cual es uno de los problemas de mayor relevancia e importancia en la industria energética por la enorme cantidad de gas que se mueve por un sistema de distribución cada año.  En el mundo real, este tipo de instancias son muy grandes, en términos del número de variables de decisión y del número de restricciones tecnológicas, y muy complejas debido a la presencia de no linealidad y no convexidad en el conjunto  de soluciones factibles y en la función objetivo.  La contribución del presente trabajo consiste en ilustrar cómo un método de solución basado en técnicas avanzadas de optimización como lo son la programación dinámica no secuencial y la descomposición de redes puede emplearse para mejorar notablemente la operación de redes de transporte de gas natural.  Los resultados computacionales muestran la superioridad del método desarrollado al compararlo con el trabajo existente, convirtiéndose así en un avance considerable al estado del arte en esta disciplina.

  10. A multidisciplinary approach to diagnose naturally occurring bovine tuberculosis in Brazil Uma abordagem multidisciplinar para o diagnóstico de tuberculose bovina em um rebanho naturalmente infectado no Brasil

    Directory of Open Access Journals (Sweden)

    Carla D. Marassi

    2013-01-01

    Full Text Available A herd infected naturally with tuberculosis was investigated by different diagnostic methods. Ninety days after a screening test that identified 21 cows as skin test positive, a Comparative Intradermal Tuberculin Test (CITT was performed in those 21 cows and in 29 other randomly selected skin test negative cows. Milk samples and nasal swabs were collected prior to the CITT for bacteriological culture and PCR, while blood samples were collected for IFN release and antibody responses to MPB70 and MPB83, at three time points post tuberculin injection. Animals positive by CITT were slaughtered and disease confirmation undertaken. Based on the Kappa test, IFN was comparable to the standard tests (culture, PCR and CITT at all three sampling points. Results from both antibody ELISAs were similar but were not comparable to the standard tests. T-test analysis of the CITT, IFN and ELISAs demonstrated that their performances were not correlated. There is increasing recognition that individually, available diagnostic tests do not detect all infected cattle. Therefore, a comprehensive strategy for the diagnosis of bovine TB should include test results for the detection of both cellular and humoral immune responses where there may be animals at different stages of infection.Um rebanho bovino naturalmente infectado por tuberculose foi analisado através de diferentes métodos diagnósticos. Um teste intradérmico simples (TIC identificou 21 animais como positivos. Após 90 dias deste resultado, um teste intradérmico comparativo (TIC foi aplicado nos 21 animais positivos ao TIS, além de outros 29 animais com resultados prévios negativos escolhidos aleatoriamente. De todos estes animais (50, foram coletadas amostras de leite e secreção nasal para isolamento e identificação de microrganismos por cultura e PCR; amostras de sangue de cada um dos animais foram coletadas para exames de ELISA: produção de Interferon-gama (IFN e pesquisa de anticorpos frente

  11. Análisis detallado, mediante modelos de dispersión, del efecto de contaminantes y choque térmico sobre los edificios colindantes producido por el aprovechamiento de la chimenea de Ca l¿Aranyó para la evacuación de gases procedentes de calderas de gas natural (Febrero 2009)

    OpenAIRE

    Arnaldos Viger, Josep; Cremades Oliver, Lázaro Vicente

    2009-01-01

    Análisis detallado, mediante modelos de dispersión, del efecto de contaminantes y choque térmico sobre los edificios colindantes producido por el aprovechamiento de la chimenea de Ca l¿Aranyó para la evacuación de gases procedentes de calderas de gas natural

  12. Natural gas; Gas Natural

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, Carlos A.; Moraes, Claudia C.D. [Eletricidade de Sao Paulo S.A. (ELETROPAULO), Sao Paulo, SP (Brazil); Fonseca, Carlos H.F. [Centrais Eletricas de Santa Catarina S.A., Florianopolis, SC (Brazil); Silva, Clecio Fabricio da; Alves, Ricardo P. [Companhia Paranaense de Energia (COPEL), Curitiba, PR (Brazil); Sposito, Edivaldo Soares; Hulle, Lutero [Espirito Santo Centrais Eletricas S.A. (ESCELSA), Vitoria, ES (Brazil); S. Martins, Icaro da [Centrais Eletricas do Norte do Brasil S.A. (ELETRONORTE), Belem, PA (Brazil); Vilhena, Joao Luiz S. de [Companhia Energetica de Minas Gerais (CEMIG), Belo Horizonte, MG (Brazil); Fagundes, Zaluar Aquino [Companhia Estadual de Energia Eletrica do Estado do Rio Grande do Sul, Porto Alegre, RS (Brazil)

    1996-12-31

    An increase in the consumption of natural gas in Brazil is an expected fact in what concerns energetic planning. This work presents the existing situation in what concerns natural gas utilization in the main world economies, as well as an analysis of the participation of this fuel among the energy final consumption per sources. The Brazilian consumption of natural gas is also analysed as well as the international agreement between Brazil and Bolivia for natural gas commercialization. Some legal, institutional and political aspects related to natural gas commercialization are also discussed. Finally, several benefits to be brought by the utilization of natural gas are presented 10 refs., 3 tabs.

  13. ANÁLISIS SOCIOECONÓMICO DE LA CUENCA DEL RIO CUALE, JALISCO, MÉXICO: UNA CONTRIBUCIÓN PARA LA DECLARACIÓN DEL ÁREA NATURAL PROTEGIDA RESERVA DE LA BIOSFERA EL CUALE

    Directory of Open Access Journals (Sweden)

    Jorge Téllez López

    2013-06-01

    Full Text Available Durante los meses de enero a mayo de 2013, a través de la metodología propuesta por Alciaturi (2009; se realizó el análisis de los factores socioeconómicos involucrados en la cuenca del rio Cuale, Jalisco, México. Los resultados incluyeron aspectos relacionados con la dinámica demográfica, grado de marginación, nivel educativo, población económicamente activa, principales actividades económicas, comunidades rurales, descripción socioeconómica, potenciales de los recursos naturales, usos y aprovechamientos actuales; así como la situación jurídica de la tenencia de la tierra. El objetivo de esta investigación es conocer cómo estos factores inciden sobre los recursos naturales de la cuenca. Con la finalidad de utilizar esta información para establecer la declaratoria del Área Natural Protegida Reserva de la Biosfera El Cuale, que es una herramienta que puede ayudar a asegurar la conservación de esta zona. Por lo tanto, se han incluido elementos de análisis social, económico y ambiental, puesto que estos factores han resultado determinantes en los procesos que inciden en la deforestación y cambio de uso de suelo.

  14. Reação em Cadeia da Polimerase (PCR baseada no gene cpx para detecção de Actinobacillus pleuropneumoniae em suínos natural e experimentalmente infectados Polymerase Chain Reaction (PCR based on the cpx gene for detection of Actinobacillus pleuropneumoniae in natural and experimentally infected pigs

    Directory of Open Access Journals (Sweden)

    Karina Koerich de Souza

    2008-10-01

    Full Text Available A pleuropneumonia suína é uma das mais importantes doenças respiratórias dos suínos, estando presente em todos os países produtores. Para o controle e o monitoramento da pleuropneumonia, é necessário o desenvolvimento de métodos rápidos e acurados de diagnóstico. Com o objetivo de validar a técnica da PCR, baseada no gene cpx de Actinobacillus pleuropneumoniae, em suínos sabidamente positivos, primeiramente foi realizada inoculação experimental com amostras de A. pleuropneumoniae sorotipo 5B e coletadas amostras por meio de suabe de tonsila, biópsia de tonsila e sangue para realização da técnica de PCR, isolamento bacteriológico e teste de ELISA, respectivamente. Posteriormente, estas técnicas foram aplicadas em suínos naturalmente infectados, em três rebanhos com diferentes situações sanitárias quanto à apresentação clínica da doença. De cada rebanho, foram analisados cinco grupos de suínos com idades diferentes, sendo coletado de cada animal biópsia de tonsila para isolamento bacteriológico e PCR e sangue para determinação do perfil sorológico. Os resultados obtidos na inoculação experimental confirmaram que, mesmo com o estabelecimento da infecção comprovada pelo isolamento bacteriológico, após o período de 45 dias, não foi possível detectar o agente pela técnica de PCR. Em animais naturalmente infectados, a técnica de PCR apresentou maior sensibilidade quando comparado com o isolamento. A associação entre PCR e ELISA demonstrou ser uma boa alternativa para definir a situação sanitária do rebanho quanto à infecção por A. pleuropneumoniae.Swine pleuropneumonia is one of the most important pig respiratory diseases and has been found in all producer countries. For control and monitoring of pleuropneumonia, it is necessary the development of fast and specific methods of diagnosis. To validate PCR based on the cpx gene of Actinobacillus pleuropneumoniae in positive pigs, an experimental

  15. Granites of Salamanca. A perfect example for the recognition of natural stone as a heritage resource and their use in restoration; Granitos de Salamanca. Un ejemplo perfecto para el reconocimiento de la piedra natural como recurso patrimonial y su uso en restauración

    Energy Technology Data Exchange (ETDEWEB)

    González, C.; Pereira, D.; Baltuille, J.M.

    2017-09-01

    In the province of Salamanca (Spain) there are several quarries that used to be the source of natural stone used in the construction of historic buildings and that are today recognized by UNESCO as World Heritage Sites. In this study we investigated the granites used in the construction and restoration of the lower ashlars of the walls of different buildings in Salamanca, Alba de Tormes, Ciudad Rodrigo and Ledesma. The characterization of the different types of granite and their current state of preservation may serve to adopt specific measures for their possible use in the restoration of the architectural heritage of the province, if this should become necessary. Despite the variety of materials observed in the lower parts of the buildings (ranging from sandstone to conglomerate to granite), the stone most frequently used was the granite from Los Santos and the Martinamor granite, followed by the vaugneritic granites from Ledesma. In general the granite materials are in a good state of conservation but the existence of certain pathologies that have given rise to processes of flaking and discoloration of the rock suggests that it will be necessary to make a consistent assessment when deciding about possible actions aimed at replacing materials in these historic buildings Moreover, the various granites differ from one another and pieces should not be replaced without perfect identification of the specific type to which they belong. A detailed study of these granites is crucial for the nomination of some of them as candidates for the denomination Global Heritage Stone Resource and the whole set of Salamanca province lithologies as a Global Heritage Stone Province. [Spanish] En la provincia de Salamanca se encuentran diversas canteras que fueron origen de la piedra natural para la construcción de edificios históricos que hoy forman parte de lugares reconocidos como Patrimonio de la Humanidad por la UNESCO. Para este trabajo se han investigado los granitos utilizados

  16. Disposição em aterros controlados de resíduos sólidos industriais não-inertes: avaliação dos componentes tóxicos e implicações para o ambiente e para a saúde humana

    Directory of Open Access Journals (Sweden)

    Sisinno Cristina L. S.

    2003-01-01

    Full Text Available Para que um resíduo sólido seja disposto adequadamente, é necessário classificá-lo segundo as Normas Técnicas Brasileiras, cuja principal é a NBR 10.004. Resíduos sólidos industriais não-inertes normalmente têm sido encaminhados para disposição final em aterros controlados, que em sua maioria não operam de forma eficiente, além de estarem geralmente localizados próximos a núcleos populacionais e ecossistemas importantes. A fim de avaliar a toxicidade potencial dos resíduos produzidos em indústrias de diferentes segmentos, 21 amostras foram analisadas de acordo com as orientações descritas na NBR 10.004. Das amostras estudadas, 18 foram classificadas como resíduos não-inertes. Os principais parâmetros que contribuíram para a classificação das amostras em resíduos não-inertes foram: alumínio, ferro, manganês, fenol e surfactantes. Destes, o alumínio, o manganês e o fenol são as substâncias de maior interesse toxicológico para a saúde humana e ambiental, uma vez que podem alterar a qualidade das águas subterrâneas localizadas nas áreas de disposição de resíduos.

  17. Aspectos clínicos, epidemiológicos e patológicos da infecção natural em bovinos por Trypanosoma vivax na Paraíba Clinical, epidemiological and pathological signs of natural infection in cattle by Trypanosoma vivax in Paraíba, Brazil

    Directory of Open Access Journals (Sweden)

    Jael S. Batista

    2008-01-01

    Full Text Available Descrevem-se dois surtos de tripanossomíase por Trypanosoma vivax em bovinos, ocorridos em dois estabelecimentos do alto sertão da Paraíba. Os sinais clínicos, a patologia e a epidemiologia da doença foram estudados no período de maio de 2005 a novembro de 2006.T. vivax foi identificado em esfregaços da capa leucocitária e mediante a reação em cadeia da polimerase (PCR. Os animais afetados apresentaram anorexia, depressão, febre, anemia, perda de peso, redução da produção leiteira, cegueira transitória, aborto e sinais nervosos caracterizados por incoordenação motora, salivação, opistótono, nistagno, tetania e bruxismo. Todos os animais que apresentaram sintomatologia nervosa morreram. As alterações macroscópicas observadas em um bovino submetido à necropsia foram aumento de volume dos linfonodos, atrofia serosa dos depósitos de gordura, aumento de volume do baço com evidência da polpa branca, hidropericárdio, além de petéquias e equimoses no epicárdio. Histologicamente havia meningoencefalite. O controle da doença na propriedade com tratamento específico dos casos clínicos com aceturato de diminazene foi eficiente, pois após o tratamento não se verificou mais a presença do parasita em esfregaços sanguíneos nem evidência clínica da enfermidade em até 2 meses após o início do surto. Os fatores epidemiológicos favoráveis à ocorrência dos surtos foram a abundância de vetores mecânicos, como tabanídeos e Stomozys spp., e a entrada, no rebanho, de animais oriundos de propriedades onde ocorreu a doença em questão. Sugere-se que o semi-árido do Nordeste, devido a períodos prolongados de secas e altas temperaturas, é região de instabilidade enzoótica para a tripanossomíase, em conseqüência, provavelmente, ao ambiente desfavorável para o desenvolvimento de vetores durante a maior parte do ano.Two outbreaks of trypanosomiasis by Trypanosoma vivax, reported in cattle, occurred on two farms

  18. Potential of chitosan from Mucor rouxxi UCP064 as alternative natural compound to inhibit Listeria monocytogenes Potencial de quitosana de Mucor rouxxi UCP 064 como componente alternativo para inibir Listeria monocytogenes

    Directory of Open Access Journals (Sweden)

    Roberta A. Bento

    2009-09-01

    produção de quitosana (62 mg.g-1 foram encontrados após 48 horas de cultivo. As quantidades residuais de glicose e nitrogênio no meio de crescimento após 96 horas foram 4,1 e 0,02 g.L¹ , respectivamente. A quitosana obtida apresentou grau de deacetilação de 85% e peso molecular de 2,6 x 10(4 g.mol-1. Os valores da Concentração Inibitória Mínima (CIM e Concentração Bactericida Mínima (CBM da quitosana sobre L. monocytogenes ATCC 7664 foram, respectivamente, 2,5 e 5,0 mg.mL-1. Nas concentrações de 2,5 e 5,0 mg.mL-1a quitosana fúngica causou um efeito bactericida em um tempo máximo de 4 horas. Valores de contagens menores que 2 log ufc.mL-1foram encontrados a partir de 2 horas, sendo que nenhuma recuperação no crescimento bacteriano foi encontrado até 96 horas. Estes resultados mostram o potencial biotecnológico do meio jacatupé para produção de quitosana por Mucor rouxxi, bem como suportam o possível uso racional de quitosana fúngica como antimicrobiano natural para controlar o crescimento de L. monocytogenes.

  19. Taking advantage of natural gas for the energy and fuel supply for the Brazilian energy intensive industries: aluminium, siderurgy and chemical products; O aproveitamento do gas natural para o suprimento de energia e combustivel para as industrias energointensivas brasileiras: aluminio, siderurgia e produtos quimicos

    Energy Technology Data Exchange (ETDEWEB)

    Romero, Jose Fernando Leme [Universidade Sao Paulo (USP), SP (Brazil). Programa Interunidades de Pos Graduacao em Energia]. E-mail: romero@iee.usp.br

    2006-07-01

    This work intend to analyse natural gas success in the energy generation for siderurgy industry, aluminium and basic organic chemical products. There is a necessity to inform economy-policy and the energy policy relationship, showing the Brazilian State actuation in the economic development mechanism and electric energy supply. Cast iron and iron, metals and no-irons are considered as electric intensives and energy intensives industry activities. These are sectors that produce merchandises for exportation and spend many quantities of electrical energy for each produced physical unity of law aggregate economic value. (author)

  20. Os benefícios da utilização de coagulantes naturais para a obtenção de água potável = The benefits of using natural coagulants to obtain potable water

    Directory of Open Access Journals (Sweden)

    Milene Carvalho Bongiovani

    2010-07-01

    Full Text Available Este trabalho tem como objetivo a avaliação dos benefícios da obtenção de água potável a partir de coagulantes naturais, em função da remoção dos parâmetros cor, turbidez e compostos com absorção em UV-254 nm, utilizando como agente coagulante o Tanfloc SS. Com esta finalidade, ensaios de coagulação/floculação/sedimentação foram realizados em aparelho “jar test”, com água superficial de características de alta cor/turbidez. O pH de coagulação (3,0 a 9,0 e a concentração do coagulante (10,0 a 60,0 mg L-1 foram variadoscom a finalidade da construção dos diagramas de coagulação e a determinação das regiões de melhor eficiência de remoção de cor e turbidez. As condições de trabalho para o processo de coagulação/floculação/sedimentação foram fixadas de acordo com ensaios prévios. Com os dados obtidos, o diagrama de coagulação foi construído utilizando o programa 3DField 2.7.0.0. Com base nestes diagramas, para o coagulante Tanfloc SS, concluiu-se que as melhores remoções dos parâmetros estudados, em sua maioria, ocorreram para a faixa de pH entre 6,0 e 9,0 em todas as concentrações estudadas. Desta forma, constatou-se que a utilização de coagulantes orgânicos biodegradáveis é, portanto, uma alternativa técnica aos coagulantes convencionais, possuindo benefícios de saúde pública além de preservação ambiental.This work aims to evaluate the benefits of obtaining potable water from natural coagulants, in function of the removal of the parameters color, turbidity and compounds with absorbing in UV-254 nm, using Tanfloc SS as a coagulant. To that end, coagulation/flocculation/sedimentation tests were performed in jar test with surface waterfeaturing high color/turbidity. The coagulation pH (3.0 to 9.0 and the concentration of coagulant (10.0 to 60.0 mg L-1 were varied with the purpose of constructing coagulation diagrams and determine regions of best efficiency for removal of color and

  1. Circulação extracorpórea por membrana (ECMO em recém-nascido com insuficiência respiratória por síndrome de aspiração meconial: efeitos da administração de surfactante exógeno Extracorporeal membrane oxygenation (ECMO in a neonate with respiratory distress due to meconium aspiration syndrome: Effect of the administration of exogenous surfactant

    Directory of Open Access Journals (Sweden)

    João Gilberto Maksoud-Filho

    2001-06-01

    Full Text Available OBJETIVO: apresentar a evolução clínica de recém-nascido portador de insuficiência respiratória grave neonatal secundária à Sindrome de Aspiração Meconial tratado por Circulação Extracorpórea por Membrana, ou, conforme o termo consagrado em língua inglesa, ECMO (Extracorporeal Membrane Oxygenation, o efeito do uso de surfactante exógeno neste caso e os custos do procedimento. MÉTODOS: Descrição de um caso de Síndrome de Aspiração Meconial, tratado na UCINE (Unidade de Cuidados Intensivos Neonatais do Instituto da Criança Prof. Pedro de Alcantara, Hospital das Clínicas da Universidade de São Paulo. RESULTADOS: O suporte extracorpóreo teve a duração de 5 dias, sem complicações clínicas ou mecânicas. Surfactante exógeno de origem porcina foi administrado no 4o dia, após o quê observamos uma melhora significativa na complacência pulmonar. O recém-nascido pôde então ser rapidamente decanulado. Os custos do tratamento foram compatíveis com a realidade nacional em relação a um recém-nascido criticamente enfermo. CONCLUSÕES: a ECMO é indicada em casos de insuficiência respiratória neonatal que não respondam a outros tratamentos existentes. Deve ser disponível em Unidades de Tratamento Intensivo (UTIs neonatais de hospitais terciários e ser empregada conforme critérios bem estabelecidos. A utilização de surfactante exógeno aparentemente antecipou a retirada da ECMO e, portanto, deve ser considerada em casos semelhantes. Os custos do tratamento justificam a organização de Equipes de ECMO nessas UTIs.OBJECTIVES: to present the clinical outcome of a newborn with severe respiratory distress secondary to meconium aspiration syndrome and treated by extracorporeal membrane oxygenation (ECMO; and to present the effect of the use of exogenous surfactant in this case and the cost of the procedure. METHODS: Case report of a newborn with meconium aspiration syndrome and treated at the neonatal ICU of the

  2. ESTRATEGIAS PARTICIPATIVAS PARA LA ENSEÑANZA DE LAS CIENCIAS NATURALES EN LA UNIVERSIDAD DE COSTA RICA (PARTICIPATIVE STRATEGIES FOR THE TEACHING OF NATURAL SCIENCES IN THE UNIVERSITY OF COSTA RICA

    Directory of Open Access Journals (Sweden)

    Marco V. Gutiérrez Soto

    2009-08-01

    Full Text Available Resumen:En este trabajo, proponemos métodos para la ejecución y evaluación cuantitativa de ejercicios participativos en la enseñanza de las ciencias naturales, diseñados bajo los principios del constructivismo, trasladando el protagonismo de los profesores a los estudiantes. Los métodos implementan principios epistemológicos, ontológicos y conceptuales actuales, propios del constructivismo cibernético de segundo orden, sustentado técnicamente en los hallazgos recientes de la Psicología cognitiva aplicada a la Educación, y los ajustan a las condiciones locales del proceso de enseñanza -aprendizaje. Los ejercicios facilitan el aprendizaje y la práctica del método científico utilizado en las ciencias naturales, específicamente en el contexto de las ciencias agrícolas, y promueven el desarrollo de habilidades técnicas y la adquisición de competencias personales.Además se promueve la práctica de la investigación científica, la formulación de hipótesis, la indagación y el uso de procedimientos para la adquisición, la sistematización y el análisis de datos, y permite la transferencia de conocimientos fundamentales a los ámbitos cotidianos. Proponemos la evaluación de estas técnicas didácticas mediante la aplicación de la V heurística o epistémica, los mapas conceptuales, las pruebas de pre test-test-post test, y las curvas de aprendizaje.Abstract:We propose new methodologies to implement and evaluate participatory exercises as aids in the teaching and learning of natural sciences; these exercises transfer teacher protagonism in the classroom to a collaborative learning process developed with the students. These methodologies deploy modern epistemological, ontological and conceptual principles, born by second-order cybernetic constructivism, technically supported by the most recent findings of cognitive psychology, as applied to the local educational process. The exercises facilitate the understanding and application

  3. Efecto del corredor vial Buga-Buenaventura, ubicado en la reserva natural bosque de Yotoco (Valle del Cauca, Colombia en la comunidad de mamíferos y fundamento para una propuesta de corredores artificiales

    Directory of Open Access Journals (Sweden)

    Wendy Francy López Meneses

    2006-07-01

    de movilidad de la fauna, por la carretera Buga-Buenaventura que pasa a través de la Reserva Natural Bosque de Yotoco, Valle del Cauca. La caracterización topográfica y fisionómica de la vegetación mostró un mosaico de diez ambientes asociados a la carretera los cuales se asociaron con los puntos captura, de observación y de atropellamiento. Se encontró que individuos de Melanomys caliginosus, Oryzomys talamancae, Rhipidomys mastacalis y Marmosa robinsoni, recapturados en más de tres ocasiones, tienden a moverse paralelamente a la carretera, sin ninguna evidencia de cruce. A pesar de que no hubo recapturas de individuos de las especies de mamíferos voladores Anoura cauddifer, Artibeus jamaicensis, Artibeus sp., Carollia brevicauda, Desmodus rotundus, Glosophaga Soricina, Sturnira luisi y Myotis riparius se puede afirmar que cruzan indiferentemente la carretera, viven en los desagues bajo esta y algunos forrajean en el borde. Particularmente Myotis riparius se ve atraída por los insectos que llegan por efecto de la luz vehicular. Los mamíferos medianos y grandes Cebus capucinus, Alouatta seniculus, Potos flavus, Aotus sp., Bradypus variegatus y Choloepus hoffmanni, forrajean en el día y en la noche cerca del borde, algunos individuos de Cebus capucinus y Alouatta seniculus fueron vistos cruzando la carretera del fragmento pequeño al grande. La fragmentación de hábitat ocasionada por dicha carretera es evidente y está ocasionando un aislamiento total en las especies de pequeños mamíferos y genera peligro de atropellamiento para algunas especies de murciélagos y monos que la cruzan. Ambientes hostiles como helechales, pastizales, cañaduzales y deslizamientos penetran cada vez más hacia el interior de cada fragmento, aislando las poblaciones y abriendo paso a fauna doméstica y a personas que se adentran a la reserva a cazar o a saquear recursos de supervivencia para la fauna nativa, al tiempo que introducen desechos, plagas (Rattus rattus

  4. Adaptação no método do peso da gota para determinação da tensão superficial: um método simplificado para a quantificação da CMC de surfactantes no ensino da química

    Directory of Open Access Journals (Sweden)

    Behring João Lino

    2004-01-01

    Full Text Available The discussion based on surfactant cleaning action is commonly used in chemistry classrooms for the comprehension of theoretical concepts related to surface tension and micelle formation. The experimental quantification of surface tension of aqueous solutions of surfactants provides the practical instruments for this discussion. The present paper describes a simplification on the common apparatus employed for the drop-weight method, making the determination of surface tension accessible to any chemistry lab. The surface tension of various liquids and the critical micelle concentration, CMC, of three commercial surfactants were measured with this modified method, and proved to be consistent with literature values.

  5. Topics to study the integrated use of natural gas in the electricity with industrial focus: a methodology for optimizing its use with application in the Vale do Paraiba region (SP-Brazil); Topicos para o estudo da utilizacao integrada do gas natural na eletricidade com enfoque industrial: uma metodologia para otimizacao de seu aproveitamento com aplicacao na regiao do Vale do Paraiba

    Energy Technology Data Exchange (ETDEWEB)

    Paro, Andre C.; Borelli, Samuel J.S. [PROMON Engenharia SA, Sao Paulo, SP (Brazil); Santos, Edmilson M. [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia; Fadigas, Eliane A. [Universidade de Sao Paulo (USP), SP (Brazil). Escola Politecnica

    2004-07-01

    After the recent announcement on the discovery of a large amount of Natural Gas (NG) in the Santos Field by PETROBRAS, use incentive policies for its consumption and consequent growth participation in the national energy matrix gained strength This paper intends to present an efficient use optimization methodology for the NG integrated to Electricity with focus on it's industrial use under the concepts of Integrated Resources Planning (IRP). Thus, the topics about NG utilization in cogeneration plants are analyzed, showing it's utilization on Electric Energy (EE) and Process Heat (Steam) supply. Its contribution to the distributed Electric Energy generation, which brings the installed generation power closer to the consumer centers and mitigates energy transmission losses, are also presented. The IRP concept is applied on the integration between industrial use and other uses of NG and on the detailing of its influence on the electric sector. Finally, a case study is presented, applying the presented methodology for the use of NG in the industry of 'Vale do Paraiba' Region (SP-Brazil), due to its industrial economy condition and easy access to the Brazilian proved reserves geographic condition. (author)

  6. Comparative analysis between two systems to generate electric energy for isolated community in the interior of the Amazon state: fuel cells with natural gas reformer versus diesel generation; Analise comparativa entre dois sistemas de geracao de energia eletrica para a comunidade isolada no interior do estado do Amazonas: celula a combustivel com reformador para gas natural versus gerador diesel

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Paula Duarte; Bergamini, Cristiane Peres; Camargo, Joao Carlos; Lopes, Daniel Gabriel [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Fac. de Engenharia Mecanica; Esteves, Gheisa Roberta Telles [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Nucleo de Pesquisas e Estudos Ambientais; Silva, Ennio Peres da Silva [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Inst. de Fisica Gleb Wataghin

    2004-07-01

    Although great part of the domestic territory is already supplied with electric energy, still there are many regions where the system is precarious or nonexistent, generically called isolated communities. In the majority of the cases these communities are supplied with Diesel oil generators and the substitution of this fuel for available alternative energy in the localities has been object of study of some institutions of research spread throughout the country. Currently, the use of fuel cells has been strongly argued in the generation of electric energy associated with the local energy necessity, from the use of a regional fuel and this is due to the high efficiency of allied energy conversion to the low ambient impacts that this equipment offers. Most of the different types of fuel cells use hydrogen as a fuel to produce electricity, and it is extracted from renewable or non-renewable sources of energy. Then, the article has the objective of comparing in first analysis the energy efficiency and the cost between the two systems: the ones used currently in the great majority of the isolated communities, constituted of a Diesel engine-generator system, with Natural Gas Reformer System/ Purifier of Hydrogen/ Fuel Cell/ and to analyze if such project presents characteristics that qualifies it to get the carbon credits proposed in the Mechanism of Clean Development. (author)

  7. Estimación de mortalidad natural e incertidumbre para congrio dorado (Genypterus blacodes Schneider, 1801 en la zona sur-austral de Chile Estimation of natural mortality and uncertainty in pink cusk-eel (Genypterus blacodes Schneider, 1801 in southern Chile

    Directory of Open Access Journals (Sweden)

    Rodrigo Wiff

    2011-07-01

    Full Text Available El congrio dorado (Genypterus blacodes es un pez demersal de gran importancia económica en la pesquería multiespecífica y multiflota que opera en la zona sur-austral de Chile (41°28'-57°00'S. Desde principio de los años noventas se consideró para efectos de la evaluación poblacional la existencia de un único stock. Sin embargo, varios antecedentes relacionados con la historia de vida y demografía han conducido a que, desde el año 2005, la evaluación de esta especie se realice bajo dos stocks administrativos, uno en la zona norte (41°28'-47°00'S y otro en la zona sur (47°00'-57°00'S. La separación de stocks produce una demanda por actualización de parámetros de historia de vida, entre éstos la mortalidad natural (M. En este trabajo se estimó M para el congrio dorado mediante métodos empíricos aplicados por zona y sexo. La incertidumbre en M fue incorporada a través de remuestreo de Monte Carlo considerando dos fuentes de error, una proveniente de los parámetros de historia de vida que alimentan los modelos empíricos y otra, proveniente de los coeficientes que los definen. El promedio de M mediante los diferentes métodos mostró, para una determinada zona, importantes diferencias entre sexos, como también para sexos conjuntos entre zonas de pesca. Los individuos de la zona norte presentaron mayor M que aquellos provenientes de la zona sur y los coeficientes de variación por método son altamente dependientes del tipo de error incorporado. El método de Pauly (1980 parece ser el más adecuado para el congrio dorado entregando valores de M para sexos conjuntos de 0,27 año-1 (IC: 0,13-0,47 en la zona norte y 0,23 año-1 (IC: 0,11-0,40 en la zona sur.Pink cusk-eel (Genypterus blacodes is a demersal fish of high economic importance for the multi-species and multi-fleet fishery operating off far-southern Chile (41°28'-57°00'S. Since the early 1990s, the existence of a single stock was assumed for purposes of stock

  8. SABERES DEL DOCENTE Y REPRESENTACIONES SOCIALES: IMPLICANCIAS PARA LA ENSEÑANZA DE LAS CIENCIAS NATURALES (KNOWLEDGE OF THE TEACHER AND SOCIAL REPRESENTATIONS: IMPLICATIONS FOR TEACHING OF NATURAL SCIENCES

    Directory of Open Access Journals (Sweden)

    Beatriz Aguilar Susana

    2011-08-01

    Full Text Available Resumen:En este artículo presentamos un análisis comparativo de tres estudios realizados con docentes de distintos niveles educativos de la provincia de San Juan (Argentina y en los que, a través de técnicas de evocación y jerarquización de palabras, identificamos la estructura de sus representaciones sociales sobre distintos aspectos vinculados a la enseñanza y al aprendizaje de las Ciencias Naturales. Para analizar las estructuras e identificar los elementos comunes que atraviesan estos estudios, consideramos la clasificación de saberes del docente de Braslavsky y Birgin (sustantivo, pedagógico e institucional. Los resultados obtenidos nos han permitido acceder a información importante acerca de los significados compartidos por este grupo profesional. Así, la similitud entre las estructuras de los distintos grupos nos muestra que existe una representación que permite describir lo que son y lo que hacen los docentes, correspondiéndose con los postulados educativos tradicionales, marcando las diferencias con otros grupos y otras actividades profesionales. Las categorías que se presentan de modo constante, más allá de las temáticas planteadas en cada caso particular, se vinculan con el hecho de “educar”, es decir, formar sujetos escolarizados para el mundo social en el cual se está inserto. De esta manera, podemos pensar que aunque las demandas sociales ejercen una fuerte presión sobre los docentes e intentan desviarlos en su desempeño profesional hacia otras funciones (asistenciales, sanitarias o de contención social, éstas no constituyen la esencia de la función social que ellos se auto-atribuyen y pretenden conservar a lo largo del tiempo.Abstract: This article presents a comparative analysis of three studies made with teachers from different educational levels in the province of San Juan (Argentina, in which we identified the structure of their social representations - through techniques of evocation and

  9. Estudio experimental de la alteración de la mojabilidad mediante el uso de un surfactante extraído del aceite del pino TOFA en el sistema crudo liviano/agua/SiO2

    Directory of Open Access Journals (Sweden)

    Hildemaro Meléndez

    2012-12-01

    Full Text Available It is known that much of the oil is trapped in reservoirs after use of conventional methods for oil extraction. However, several methods have been introduced to increase the recovery of this oil, one of them is through the alteration of the wettability. Methods suggested for this purpose include the use of chemical additives such as surfactants. In this work it was evaluated the technical feasibility of using a natural surfactant to alter the wettability of a system Oil/Water/SiO2, by measuring contact angles. The results show the feasibility of using natural surfactant alterative of wettability for mineral surfaces having different wet conditions (water -wet, intermediate or oil.

  10. Natureza, classificação e intervenções de enfermagem para pacientes com mediastinite Naturlaleza, clasificación y intervenciones de enfermería para pacientes con mediastinitis Nature, classification and nursing interventios for patients with mediastinitis

    Directory of Open Access Journals (Sweden)

    Amélia Rodrigues de Almeida

    2008-08-01

    Full Text Available Trata-se de estudo quantitativo, descritivo e retrospectivo que objetivou analisar a natureza e classificação das intervenções de enfermagem para pacientes acometidos por mediastinite no pós-operatório de cirurgia cardíaca. Os resultados obtidos através de prontuários mostraram uma incidência de 3% de mediastinite. A população do estudo era na maioria do sexo masculino, sendo todos diabéticos. Os problemas de enfermagem foram categorizados segundo Horta e as intervenções classificadas conforme a NIC. Dentre os problemas levantados, 76,5% foram de necessidade psicobiológica e 23,5% psicossocial. Implementou-se 53 intervenções de enfermagem: 84,9% de natureza fisiológica, 11,3% comportamental e 3,8% familiar. A relação entre problemas identificados e intervenções desenvolvidas, foi adequada principalmente nas necessidades psicobiológicas, sendo freqüente as intervenções educativas, principalmente nas necessidades psicossociais.Se trata de estudio cuantitativo, descriptivo y retrospectivo que objetiva analizar la naturaleza y clasificación de las intervenciones de enfermería para pacientes acometidos por mediastinite en el post-operatorio de cirugía cardiaca. Los resultados logrados a través de prontuarios mostraron una incidencia del 3% de mediastinite. La población del estudio era en la mayoría del sexo masculino, siendo todos diabéticos. Los problemas de enfermería fueron categorizados según Horta y las intervenciones clasificadas conforme a NIC. Dentro de los problemas estudiados, 76,5% fueron psicobiológicas y 23,5% psicosocial, Se implementó 53 intervenciones de enfermería: 84,9% de naturaleza fisiológica, 11,3% comportamental y 3,8% familiar. La relación entre problemas identificados e intervenciones realizadas, fue adecuada principalmente en las necesidades psicobiológicas, siendo frecuente las intervenciones educativas, principalmente en las necesidades psicosociales.This is a descriptive and

  11. New technology for the emulsification of petroleum residuals in water; Nueva tecnologia para la emulsificacion de residuales del petroleo en agua

    Energy Technology Data Exchange (ETDEWEB)

    Peralta, M. Vita; Arriola, Alejandro M.; Sanchez S, Ramon; Manzanares P, Emilio; Romo M, Cesar A.; Yery de Coss P, R. [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    emulsiones son principalmente la relacion de sus componentes, viscosidad, tamano y distribucion de gota y su estabilidad. Los trabajos experimentales se iniciaron produciendo emulsiones en forma de lotes, utilizando muestras de aproximadamente 500 ml de residuo de vacio. En esta primera etapa se examinaron, a diferentes concentraciones, ocho surfactantes distintos, al igual que combinaciones entre ellos, tambien se utilizaron siete diferentes estabilizadores. Como estas pruebas se han logrado identificar las concentraciones, asi como las relaciones mas adecuadas de surfactante y estabilizador para la produccion de emulsiones de residuo de vacio-en agua. El tamano y distribucion de gota se ha determinado mediante un microscopio optico LEICA, modelo DMLS, que tiene acoplado un sistema fotografico en el que se obtiene una foto de emulsion y, posteriormente, se utiliza un sistema de analisis de imagenes para la obtencion de los valores de diametro de las gotas presentes en la emulsion. Finalmente, mediante un software estadistico se obtiene el tamano promedio de la particulas, asi como la distribucion del tamano de las gotas. Se muestran los resultados de pruebas emulsiones que permanecen fluidas y se dan un ejemplo de la microestructura de una emulsion de residuo de vacio-en-agua. Asi como un ejemplo de histograma de la distribucion de tamano de gota de una emulsion de residuo de vacio-en-agua. Se muestran graficas de la viscosidad en funcion del esfuerzo de corte a diferentes temperaturas de una emulsion de residuo de vacio-en-agua y otra de la viscosidad en funcion de la temperatura a diferentes esfuerzos de corte de una emulsion de residuo de vacio-en-agua.

  12. Una propuesta para la gestión sostenible de los postgrados en Ciencias naturales para el desarrollo: flexibilidad y aplicación (Nota técnica A proposal for the sustainable management of natural sciences postgraduates in development: flexibility and application (Technical note

    Directory of Open Access Journals (Sweden)

    Tomás de Jesús Guzmán-Hernández

    2013-06-01

    Full Text Available En América Latina, la realidad muestra la necesidad de mejorar la calidad de la formación universitaria de los docentes e investigadores, tanto a nivel de maestría como de doctorado. El postgrado “Doctorado en Ciencias Naturales para el Desarrollo” (DOCINADE rompe los esquemas tradicionales de los sistemas de estudios superiores y utiliza las tecnologías de la información y la comunicación, el diálogo mediado a distancia y un sistema bimodal integrado, para ofrecer a la comunidad latinoamericana una opción de estudios flexible, pertinente, racional y vinculada con su entorno.  Varias universidades públicas de países de la región ya trabajan en este postgrado, por ejemplo, Costa Rica, México, Nicaragua y Cuba, con el apoyo de otras instituciones de educación superior de Estados Unidos, Canadá y España, entre otros. El programa ofrece cuatro énfasis: Sistemas de producción agrícola sostenible, Manejo sostenible de recursos naturales, Gestión y cultura ambiental y Tecnologías electrónicas aplicadas.  La propuesta incluye el reconocimiento de la maestría académica y la continuidad en el programa de postgrado, con temas de investigación relacionados con las prioridades locales, regionales o nacionales y dirigiendo los esfuerzos hacia la sostenibilidad, los sistemas limpios de producción y la educación ambiental.  El programa ha recibido el apoyo financiero de la Asociación Nacional de Universidades e Instituciones de Educación Superior de México y el Consejo Superior Universitario Centroamericano (CSUCA durante el periodo 2001-2005, el Ministerio de Ciencia y Tecnología (MICIT en 2002-2011 y el Consejo Nacional de Rectores (CONARE en 2005-2013 (estas dos últimas de Costa Rica.  El postgrado fue diseñado por doctores de universidades latinoamericanas para estudiantes provenientes de la región. Los objetivos son compartir esta experiencia, sus resultados y encontrar nuevos aliados y socios que permitan ampliar

  13. Using the direct method in organophilization of clay chocolate 'A' with organic surfactant; Utilizacao do metodo direto na organofilizacao da argila chocolate 'A' com surfactante organico

    Energy Technology Data Exchange (ETDEWEB)

    Patricio, A.C.L.; Sousa, A.B.; Silva, M.M. da; Rodrigues, M.G.F.; Laborde, H.M., E-mail: cadigena@hotmail.com [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Centro de Ciencias e Tecnologia. Unidade Academica de Engenharia Quimica

    2012-07-01

    During the development of this work, we studied the preparation of organoclays through direct method, starting from the natural clay Chocolate 'A' using the quaternary ammonium salt, chloride, alkyl dimethyl benzyl ammonium (Dodigen). The samples were characterized by X-Ray Diffraction (XRD), Infrared Spectroscopy in the Region (IV), Gravimetric and Differential Thermal Analysis (DTA / TGA) and swelling of Foster using solvents, gasoline, kerosene and diesel. Was observed by the results XRD, IR and DTA / TG effective intercalation of quaternary ammonium salts of the inter lamellar spaces of the clay, and by Foster swelling test samples treated with the quaternary ammonium salt Dodigen showed affinity for all the solvents tested. (author)

  14. Uso de programas informáticos para el aprovechamiento de la luz natural en la iluminación de edificios, mediante una adecuada elección del acristalamiento de vidrio.

    OpenAIRE

    Anta Fernández, Ignacio

    2006-01-01

    Los distintos tipos de vidrios que se comercializan hoy día, nos dan una amplia gama de posibilidades para satisfacer nuestras necesidades: dejar pasar la luz y no el calor, que se vea desde dentro y no se vea desde fuera, vidrios que reflejen y no deslumbren, vidrios que no se rompan, en fin, no hay mas que tener en la mano un catálogo de una empresa de fabricante de vidrio para comprobarlo. La elección se hace pues confusa, cuando se quiere concretar en una necesidad, en un tamaño,...

  15. para palmito

    Directory of Open Access Journals (Sweden)

    Francisco Paulo Chaimsohn

    2007-01-01

    Full Text Available Densidades de siembra, arreglos espaciales y fertilización en pejibaye (Bactris gasipaes cv Diamantes-10 para palmito. La investigación se llevó a cabo en la Estación Experimental Los Diamantes (Guápiles, Costa Rica, el 3 de octubre del 2003, cuyo objetivo fue la evaluación del efecto de diferentes densidades de siembra (3.333, 5.000 y 6.666 plantas/ha, arreglos espaciales, y diversos métodos de fertilización (química, orgánica, sobre el crecimiento de las plantas de pejibaye para producción de palmito. Se consideraron las variables diámetro y altura del tallo primario y el número de hojas y rebrotes como indicadores de producción. El período de evolución abarcó sólo los primeros 25 meses de crecimiento en el campo. El número de hojas, la altura y el diámetro del tallo no mostraron diferencias de respuesta relevantes. Sólo el número de rebrotes disminuyó al aumentar la densidad de la población, cuando se midió a los 15 meses de edad. El efecto de la fertilización se hizo evidente después de la primera cosecha, realizada a los 20 meses, debido al aumento de la competencia entre plantas, ahora más desarrolladas. Fue entonces cuando la fertilización química indujo la producción de un mayor número y vigor de los rebrotes. Sin embargo, las prácticas evaluadas 25 meses después de la siembra, no habían infl uido hasta ese momento en el número de palmitos cosechados, ni tampoco había afectado las características físicas de los sectores foliar y caulinar del palmito.

  16. Ácidos Húmicos: sustrato natural empleado como tratamiento alternativo en la inhibición de la bacteria Helicobacter Pylori, aporte desde la docencia para una mejora en la calidad de vida

    Directory of Open Access Journals (Sweden)

    Tatiana Sarmiento Monsalve

    2009-10-01

    Full Text Available A través de la historia, las enfermedades han sido tratadas por compuestos naturales, dentro de los que están los Ácidos Húmicos (AH, biopolímeros que se encuentran en plantas, aguas estancadas y carbones de bajo rango. Estos sustratos poseen grupos funcionales que les atribuyen propiedades terapéuticas para el hombre.

  17. Principios teatrales para docentes

    Directory of Open Access Journals (Sweden)

    R. Irene Arroyo Zúñiga

    2005-01-01

    Full Text Available Este trabajo pretende dar herramientas a los docentes para que puedan utilizarlas como parte de las actividades dentro de un plan de elección, en cualquier disciplina. Además encontrará una exposición de los elementos que componen el arte de la representación escénica, como son: 1. Expresión corporal; es la capacidad de expresar emociones partiendo únicamente de nuestro cuerpo. 2. Impostación; es la habilidad de proyectar la voz sin lastimar las cuerdas vocales. 3. Dicción; es la pronunciación correcta de las palabras. 4. Actuación; es la posibilidad de crear un personaje partiendo de los recursos expresivos y de la forma natural en que el alumno acostumbra a reaccionar. Técnica de improvisación, en éste artículo propongo una serie de seis pasos que pueden ser de gran ayuda a la hora de usar el teatro como recurso didáctico. El teatro a lo largo de la historia ha sido usado para transmitir conocimientos, valores, creencias y todo aspecto inherente a los individuos y su entorno social. Por lo tanto debemos aprovechar al máximo los beneficios que nos ofrece el teatro como educadores

  18. Patrones biogeográficos de los tenebriónidos epigeos (Coleoptera: Tenebrionidae del Área Natural Protegida Península Valdés, Argentina: implicaciones para su conservación Biogeographic patterns of epigean tenebrionids (Coleoptera: Tenebrionidae from Protected Natural Area Península Valdés, Argentina: implications for its conservation

    Directory of Open Access Journals (Sweden)

    Rodolfo Carrara

    2011-12-01

    Full Text Available Se realizó un estudio sobre los patrones biogeográficos de los tenebriónidos epigeos (Coleoptera: Tenebrionidae que habitan el Área Natural Protegida Península Valdés (Chubut, Argentina, basado en datos de colecciones y material recolectado en viajes a la zona. Se presenta una lista exhaustiva de las especies en la que se consigna el grado de adaptación a la aridez de cada una de ellas; un análisis de la calidad del inventario y la estimación de la riqueza total de especies; una evaluación de los patrones de distribución y riqueza, y la identificación de áreas de significativa mayor riqueza o hotspots. Los resultados indicaron que 25 especies con diferente grado de adaptación a la aridez habitan la península, aunque se estima que la riqueza total del área debería ser de 27. Además, se reconoció que los rangos de distribución de los tenebriónidos siguen una distribución log-normal y que sólo 3 especies son endémicas. Espacialmente, la riqueza se distribuyó de forma agregada en la península y se determinaron 10 hotspots. Finalmente, considerando que en la península Valdés están permitidas actividades productivas que originan una importante degradación del hábitat, se examina la implicancia de los resultados para la conservación de los tenebriónidos epigeos.We conducted a study of the biogeographic patterns of epigean tenebrionids (Coleoptera: Tenebrionidae that inhabit the Protected Natural Area Península Valdés (Chubut, Argentina, based on data obtained from collections and collecting trips. We present a comprehensive species list, where we detail the degree of adaptation to aridity shown by each species, an analysis of the quality of the inventory, an estimation of total species richness, and an evaluation of distribution and richness patterns, with the identification of areas of significantly greater richness or "hotspots". The results indicated that 25 species with different degrees of adaptation to aridity

  19. Metátese de olefinas aplicada ao fechamento de anéis: uma ferramenta poderosa para a síntese de macrociclos naturais Ring-closing olefin metathesis: a powerful tool for the synthesis of natural macrocycles

    Directory of Open Access Journals (Sweden)

    Anderson Rouge dos Santos

    2008-01-01

    Full Text Available For a quarter of a century, metathesis has become indispensable for the synthesis of natural and non-natural products, particularly of biologically active compounds. This review illustrates through a maximum of appropriate examples the power and the versatility of the metathesis ring-closure (RCM reaction as a key ring-closure methodology for the synthesis of natural macrocycles. Its high functional group compatibility as well as the possibility of further transformations makes this reaction a powerful tool in the cases where the structural framework and function requirements are difficult to meet.

  20. Diseño y desarrollo de una campaña de comunicación gráfica publicitaria para el Parque Natural de la Albufera de Valencia.

    OpenAIRE

    SIMÓN RÚA, CELIA

    2017-01-01

    This work is based in the design and development of a graphic advertising campaign, of touristic and environmental nature, for Albufera's Natural Park in the city of Valencia (Spain). The project combines two artistic fields: graphic design and photography; with the intention of arousing interest on both, tourists and habitants of Valencia. The campaign follows a Visual Communication Plan and is presented in different formats such as posters, postcards and brochures. El presente trabajo tr...

  1. Alternatives for the Santos Basin natural gas insertion in the energetic matrix; Alternativas para a insercao do gas da Bacia de Santos na matriz energetica. Estudo de caso: cidade de Santos

    Energy Technology Data Exchange (ETDEWEB)

    Awazu, Ricardo de Mello [Grupo MKR, Sao Paulo, SP (Brazil). Gerencia de Novos Negocios], e-mail: ricardo@mkr.com.br; Santos, Edmilson Moutinho dos [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia. Programa Interunidades de Pos-Graduacao em Energia (PIPGE)], e-mail: edsantos@iee.usp.br

    2008-07-01

    The natural gas difficult to penetrate in the residential market and compete with electrical energy is the main objective of this study, which will support that in big cities, where natural gas is already reality or will be the use of natural gas should not be considered competition for other types of energy resources but as a strategically complement of the overall power system. Electricity used as thermal source creates only demand for concessionaires and not consumption, in other words, there is short period of time when demand peaks and the amount of energy consumed by the electric shower is so high that requires a huge infra-structure of generation, transmission and distribution. However, it creates a big idle capacity in periods off-peak. The replacement of electricity to natural gas in water heating is critical factor to make the pipeline network economically feasible and to consolidate the residential market. The use of natural gas only to cooking purposes makes the network very costly and with high idle capacity. This study will discuss how an integrated planning of resources can lead to a better use of energy resources and distribution network of natural gas and electricity. (author)

  2. Proyecto de una estación reguladora y planta satélite de gas natural licuado para una industria con requerimientos permanentes de vapor y agua caliente

    OpenAIRE

    Merodio Merodio, Jesus

    2007-01-01

    La industria requiere para su funcionamiento de grandes cantidades de energía. Utilizamos la energía bajo diferentes formas: mecánica, eléctrica, térmica, etc… Hemos aprendido a utilizar estas formas de energía y las hemos aplicado con diferentes rendimientos. La energía ni se crea ni se destruye, sólo se transforma, pero en cada transformación dejamos de aprovechar parte de esta energía que se libera sin ningún aprovechamiento. Este es el concepto de energía primaria enf...

  3. Avaliação de complexo enzimático e betaína natural em rações para frangos de corte criados em aviário comercial

    OpenAIRE

    Pereira,Patrícia Watanabe Zanin; Menten,José Fernando Machado; Racanicci,Aline Mondini Calil; Traldi,Ana Beatriz; Silva,Cynthia Siqueira; Rizzo,Pricila Vetrano

    2010-01-01

    O objetivo neste estudo foi avaliar os efeitos de um complexo enzimático, composto por protease, xilanase e amilase, associado ou não a betaína em dietas para frangos de corte sobre o desempenho das aves e a análise econômica. Pintos machos da linhagem Cobb 500 (924), com peso médio inicial de 45,8 g, foram alimentados com quatro dietas, cada uma com sete repetições, em um delineamento inteiramente casualizado. Cada unidade experimental continha 33 aves. As dietas foram: controle - rações à b...

  4. Usefulness of serological ELISA assay for Taenia saginata to detect naturally infected bovines Utilização de teste sorológico ELISA para a detecção de bovinos naturalmente infectados por Taenia saginata

    Directory of Open Access Journals (Sweden)

    Silvana de Cássia Paulan

    Full Text Available Bovine cysticercosis, a cosmopolitan disease caused by Taenia saginata, leads to economic losses due to carcass devaluation at slaughter. Sanitary inspection at slaughterhouses, the routine diagnostic method in Brazil, lacks the necessary sensitivity to detect the mildly infected cattle that are typically encoutered in Brazil. In this study we have tested cattle sera from animals diagnosed as positive and negative by veterianry inspection for (1 anti-parasite antibodies using metacestodes antigens (T. solium vesicular fluid and T. saginata secretions and (2 the HP10 secreted antigen of viable metacestodes. The cut-off values were calculated by ROC curve for intense and mild infections conditions, and by the classical method ( for negative samples. The sensitivity and specificity of these diagnostic tests were different depending on the assumed cut-off value and, importantly, whether the infection was mild or intense. In spite of these observations, however, such ELISA assays for serum antibodies and parasite antigens constitute an important tool for epidemiological porposes, and in establishing priorities for the control of bovine cysticercosis.A cisticercose bovina, uma doença cosmopolita causada pela Taenia saginata, resulta em perdas econômias devido à desvalorização de carcaças durante o abate. A inspeção sanitária nos frigoríficos, método de diagnóstico de rotina no Brasil, não possui sensibilidade necessária para detectar animais levemente infectados, os quais são tipicamente encontrados no Brasil. Neste estudo testou-se soro de animais diagnosticados positivos e negativos pela inspeção veterinária por (1 anticorpos anti-parasita usando antígenos de metacestóides (fluido vesicular de T. solium e secreções de T. saginata e (2 antígeno secretado de metacestóides viáveis. Os pontos de corte foram calculados pela curva ROC, considerando condições de intensa e leve infeção, e pelo método clássico ( das amostras

  5. Pesquisa sobre paisagem urbana, diversidade e adequação ao relevo natural do comércio de pequeno porte: indicações para avaliação de leis de uso e ocupação do solo

    Directory of Open Access Journals (Sweden)

    João Júlio Vitral Amaro

    2006-12-01

    Full Text Available O texto aborda a questão da paisagem urbana e a natureza interdisciplinar das pesquisas relacionadas com a localização de atividades na cidade. Tomando como exemplo o caso da distribuição do comércio de pequeno porte na cidade, procura-se apontar a interação dos vários fatores envolvidos na escolha da localização. Com o conceito de “diversidade” é indicada a interdependência sistêmica entre vários elementos que contribuem para caracterizar as vantagens da proximidade das diversas atividades urbanas. Procura-se mostrar ainda a abordagem econômica como uma das possibilidades da análise do comércio urbano, centrando a atenção em duas de suas vertentes teóricas. A limitação de ambas consiste em tratar muito esquematicamente o conceito de “mobilidade”. Procura-se enfatizar que “mobilidade” é uma categoria central para se analisar a localização de atividades econômicas e, com isso, o caráter singular e único de cada cidade. São apontadas ainda as implicações do relevo natural para o assentamento das atividades e para a percepção pelos habitantes das diversas características dos lugares na cidade.

  6. Avaliação do desempenho de surfactantes para a solubilização de fases líquidas não aquosas em meio aquoso Evaluating surfactant performance as solubilizer of non-aqueous phase liquids within aqueous media

    Directory of Open Access Journals (Sweden)

    Elizabeth Fátima de Souza

    2010-01-01

    Full Text Available The presence of non-aqueous phase liquids (NAPLs in the subsurface is a threat to public health as well as a serious environmental issue. NAPLs may remain adsorbed or form lenses floating on aquifers causing long-term contaminations. Surfactants may increase NAPLs solubility, enhancing the pump-and-treatment performance. Size, shape, hydration and ionization degree of the micelles define the affinity and the space available for the solubilization of a particular contaminating agent. The tests carried out at laboratory scale, taking into account the NAPL to be removed and the medium characteristics were useful to select surfactants and evaluate their efficiency as NAPLs solubilizers.

  7. Análise de inteligibilidade textual por meio de ferramentas de processamento automático do português: avaliação da Coleção Literatura para Todos = Text readability analysis with Natural Language Processing Tools: assessment of the “Literatura para Todos” Collection

    Directory of Open Access Journals (Sweden)

    Rodrigues, Erica dos Santos

    2013-01-01

    Full Text Available O presente trabalho apresenta resultados de pesquisa referente à inteligibilidade dos livros da Coleção Literatura para Todos 1, publicada pelo MEC/SECAD (2006 e distribuída para jovens e adultos recém-alfabetizados. A investigação da inteligibilidade dos textos buscou conjugar pressupostos da Psicolinguística e ferramentas de processamento automático da língua portuguesa. Utilizamos critérios de inteligibilidade referidos na literatura psicolinguística, e tentamos capturar de maneira objetiva o grau de complexidade linguística dos livros através de ferramentas computacionais: o analisador morfossintático PALAVRAS e o programa Coh-Metrix Port. Nossos resultados sugerem que os livros dessa coleção são complexos para o público pretendido. Assumindo que os neoleitores estão na etapa inicial do processo de alfabetização, é nítido que esses livros exigem um esforço de decodificação da escrita que está além de sua capacidade

  8. Programa para la puesta en valor del patrimonio sonoro del Parc Natural de l'Albufera (España) y su difusión como producto de turismo accesible

    OpenAIRE

    CHULIÀ GASTALDO, ALBA

    2017-01-01

    Los humedales representan ámbitos territoriales que cuentan con una gran biodiversidad de tipismos -imaginario colectivo-, elementos y prácticas que los hacen especialmente valiosos. En particular, l’Albufera de Valencia atesora un patrimonio cultural y natural único; no exento de una enorme antropización y alteración. Es por ello que, fue declarada parque natural en 1986 con el propósito de detener el proceso de degradación padecido por este espacio en la década de los 70. ...

  9. CONTENT ORGANIZATION IN THE NATURAL SCIENCES SUBJECTS, TO FAVOR PROBLEM RESOLUTION / TRATAMIENTO AL CONTENIDO DEL ÁREA DE LAS CIENCIAS NATURALES PARA FAVORECER LA RESOLUCIÓN DE PROBLEMAS

    OpenAIRE

    Yanet Edith Batista Freyre; Yolanda Cruz Proenza Garrido; Luis Manuel Leyva Leyva; Carlos Miguel Martínez Pérez; Orlando Montero Ramírez

    2013-01-01

    It was presented the need of improving the area of Natural Sciences in the teaching-learning process in primary schools to solve problems, as a component in the comprehensive formation of scholars; that is, to get advantage from the curriculum, the cultural-historical experience and the social interaction of the scholar to favor it, is the essence of this article. In this aspect it plays an essential role the knowledge of the contents of the subjects of the area of Natural Sciences in the pri...

  10. Modelagem matemática e simulação de um permeador de gases para separação de CO2 de gás natural.

    OpenAIRE

    Gabriel Pereira Crivellari

    2016-01-01

    A produção de petróleo no pré-sal pode ser associada a contaminantes como o CO2. As plataformas instaladas neste polo possuem o sistema de remoção de CO2 usando permeação em membrana polimérica, que separa a corrente de gás em uma pobre em CO2 e outra rica neste. Este trabalho propõe um modelo para simulação da separação de gases utilizando permeador de gases do tipo espiral em contra-corrente. Este modelo utiliza equações baseadas em fenômenos de transporte e termodinâmica, tais como: compor...

  11. Método para a análise da composição do custo da eletricidade gerada por usinas termelétricas em ciclo combinado a gás natural

    OpenAIRE

    Samuel Jose Sarraf Borelli

    2005-01-01

    A proposta do método de análise da composição do custo da eletricidade gerada é baseada nos processos de utilização de energia e destruição da exergia contida no combustível através dos diversos processos termodinâmicos que compõe uma usina termelétrica de ciclo combinado. O método utiliza a termoeconomia para valorar e alocar o custo da degradação da exergia ao longo dos processos, considerando os custos referentes aos insumos e equipamentos utilizados. Embora o conceito possa ser aplicad...

  12. EL CÓMIC COMO RECURSO DIDÁCTICO PARA EL APRENDIZAJE DE LAS ACTIVIDADES FÍSICAS EN EL MEDIO NATURAL EN EL 2º CICLO DE LA EDUCACIÓN PRIMARIA ESPAÑOLA

    Directory of Open Access Journals (Sweden)

    Eliseo García Cantó

    2010-01-01

    Full Text Available El presente artículo pretende mostrar la manera de trabajar la competencia lingüística en el segundo ciclo del área de Educación Física en España y más concretamente en los contenidos relacionados con las actividades en la naturaleza, a través de una herramienta motivadora para los niños como es el cómic. El alumnado va a mejorar sus hábitos lectores a través de la lectura del cómic y la realización de su correspondiente ficha de trabajo.

  13. PLURALIZING NATURE

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2014-01-01

    not necessary mean planning for a one common nature. As exemplified by the River Aire Re-naturalization Project (2002-2015), landscape architecture might provide an alternative approach to nature restoration that is more site specific and allows for multiple interpretations to coexist. In the presentation...

  14. Reguladores de crecimiento y sustratos naturales para la aclimatación de vitro-plántulas de piña Ananas comosus (L. Merr. Growth regulators and natural mediums for aclimatation of pineapple vitro-plants Ananas comosus (L. Merr

    Directory of Open Access Journals (Sweden)

    Vargas Helder

    1998-12-01

    Full Text Available Con el propósito de obtener tecnologías para la etapa de adaptación de plántulas de piña, mediante el cultivo de tejidos, se experimentaron los sustratos arena amarilla de río, suelo natural y escoria de carbón, simultáneamente con las auxinas: AIA, AIB y ANA en concentraciones de 0,500, 1.000 y 1.500 ppm. Se registraron los parámetros vegetales número de raíces, longitud de la raíz y el peso seco de la raíz. En general y
    para todo el ensayo, el sustrato arena amarilla de río fue el de mejor resultado, los otros dos manifestaron respuestas, generalmente, bajas y sin una tendencia clara. La hormona que mejor desempeño tuvo, cuando se combinó con el sustrato arena amarilla de río, fue la AIB, en concentraciones de 1000 y 1500 ppm.

    The aclimatizacion stage is the critical step during the development of tissue cultures in crops. It was evaluated the response of vitro-plants from pineapple Ananas comosus (L. Merr., to the applications of the hormones: AlA, AIB and ANA in dos es 0-500-1000 and 1500 ppm at the medium: yellow river sand, natural soil and charcoal-scoria. The number of roots, root length and dry weigh root were recorded in the vitro-plants. In general, the yellow river sand was the medium that showed the best results. The natural soil and the charcoal - scoria had low response without a clear tendency. The AIB hormone presented a very good behaviour with the combination yellow river sand at 1000 and 1500 ppm dose.

  15. Regeneración natural de pino macho (Pinus caribaea Morelet var. caribaea Barret y Golfari para el incremento del índice de boscosidad en el macizo San Felipe-Los Joberos.

    Directory of Open Access Journals (Sweden)

    Pablo Antonio Cabrera Rodríguez

    2015-09-01

    Full Text Available Natural regeneration of pino macho (Pinus caribaea Morelet var. caribaea Barret and Golfari for increasing forest rate in the massive San Felipe-Los Joberos. In this paper the behavior of natural regeneration (RN of the male pine (Pinus caribaea Morelet var. caribaea Barret and Golfari is evaluated as an alternative reforestation of logged areas or affected by forest fires in the San Felipe-LosJoberos hills . For this, a study was conducted for four years (January 2009 to May 2013, in which the deposition of litter, number of seeds in the soil, number of trees / ha; height and mean diameter in the RN was determined, loading seed into the soil, and such as nearby trees isolated adult or adult plantations. Finally the costs incurred by way of planting and analyzed alternative management were evaluated. The results, therefore the number of plants as for its size, which makes it roughly equivalent to adjacent stands from plantations, indicate the effectiveness of this type of reforestation in the area. The economic advantages of natural regeneration on the plantation are shown, making it possible to develop strategies for management of the species in these conditions. Training decision-makers on environmental education is projected to mitigate the effect on forest cover or other environmental impacts while raising the culture for payment of services generated by forest vegetation.

  16. Proposal of an integrated methodology for environmental assessment of risks and impacts to be used in strategic environmental assessment studies for the oil and natural gas sector in offshore areas; Proposta de metodologia de avaliacao integrada de riscos e impactos ambientais para estudos de avaliacao ambiental estrategica do setor de petroleo e gas natural em areas offshore

    Energy Technology Data Exchange (ETDEWEB)

    Mariano, Jacqueline Barboza

    2007-03-15

    This thesis aims to purpose an integrated methodology of environmental risk and impact assessment of the exploration and production oil and natural gas activities, to be used in strategic environmental assessment studies. It also analyzes the environmental issues associated with the upstream segment of the Brazilian oil and natural gas industry after the market opening, occurred in 1997. In this context, and under the international experience of countries that also have an open market, the strategic environmental assessment demonstrates to be the more suitable tool of public environmental management to consider the environment already during the planning phase of the oil and natural gas sector. (author)

  17. PLURALIZING NATURE

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2014-01-01

    Denmark is widely recognised for its democratic approach to planning and the idea of planning for the common good. This interest in the common good and common values seems also to be reflected in the way which nature restoration is planned and managed – one common nature directed by the public...... authorities. But nature restoration is far from being a neural undertaking. Just like any other type of heritage production it can be the source of dissonance – ‘our’ nature is not necessary ‘their’ nature. Often this dissonance is managed in ways, which are not particular sensitive to site......-specificity. As exemplified by the Skjern River Restoration Project (1999-2003), one interpretation of the landscape sometimes suppresses other valid interpretations neglecting its diverse history. However, evidence from Switzerland suggests that planning for the common good, in the case of nature restoration, does...

  18. Temporal naturalism

    Science.gov (United States)

    Smolin, Lee

    2015-11-01

    Two people may claim both to be naturalists, but have divergent conceptions of basic elements of the natural world which lead them to mean different things when they talk about laws of nature, or states, or the role of mathematics in physics. These disagreements do not much affect the ordinary practice of science which is about small subsystems of the universe, described or explained against a background, idealized to be fixed. But these issues become crucial when we consider including the whole universe within our system, for then there is no fixed background to reference observables to. I argue here that the key issue responsible for divergent versions of naturalism and divergent approaches to cosmology is the conception of time. One version, which I call temporal naturalism, holds that time, in the sense of the succession of present moments, is real, and that laws of nature evolve in that time. This is contrasted with timeless naturalism, which holds that laws are immutable and the present moment and its passage are illusions. I argue that temporal naturalism is empirically more adequate than the alternatives, because it offers testable explanations for puzzles its rivals cannot address, and is likely a better basis for solving major puzzles that presently face cosmology and physics. This essay also addresses the problem of qualia and experience within naturalism and argues that only temporal naturalism can make a place for qualia as intrinsic qualities of matter.

  19. Natural Philosophy

    OpenAIRE

    Blair, Ann M.

    2006-01-01

    Natural philosophy” is often used by European historians as an umbrella term to designate the study of nature before it can easily be identified with what we call “science” today, to avoid the modern and potentially anachronistic connotations of that term. But “natural philosophy” (and its equivalents in different languages) was also an actor's category, a term commonly used throughout the early modern period and typically defined quite broadly as the study of natural bodies. As the central ...

  20. Sistema em fluxo para determinação espectrofotométrica de uréia em plasma de sangue animal empregando leguminosa como fonte natural da enzima urease

    Directory of Open Access Journals (Sweden)

    Luca Gilmara C.

    2001-01-01

    Full Text Available A spectrophotometric flow injection analysis (FIA procedure employing natural urease enzyme source for the determination of urea in animal blood plasma was developed. Among leguminous plants used in the Brazilian agriculture, the Cajanus cajan specie was selected as urease source considering its efficiency and availability. A minicolumn was filled with leguminous fragments and coupled to the FIA manifold, where urea was on-line converted to ammonium ions and subsequently it was quantified by spectrophotometry. The system was employed to determine urea in animal plasma samples without any prior treatment. Accuracy was assessed by comparison results with those obtained employing the official procedure and no significant difference at 90 % confidence level was observed. Other profitable features such as an analytical throughput of 30 determinations per hour, a reagent consumption of 19.2 mg sodium salicylate, 0.5 mg sodium hipochloride and a relative standard deviation of 1.4 % (n= 12 were also obtained.

  1. Framing nature

    NARCIS (Netherlands)

    Jansen, Peter

    2017-01-01

    This PhD thesis is about communication concerning nature in the Netherlands. The purpose of this exploratory study is to take both a theoretical and an empirical look at whether (implicit) religious elements play a role in this communication about nature in the Netherlands.

    In this PhD

  2. natural theology

    African Journals Online (AJOL)

    p1243322

    ancient Greece. The aim of this article is not to propose a new natural theology; nor does it seek to resurrect older models. It is necessary, however, to examine the extent to ... In studies like this one the South African context is relevant, as Barth is ... human reason to reach knowledge about God's nature and works insofar as.

  3. Nature Watch

    Indian Academy of Sciences (India)

    Nature Watch. When Dragons Fly ... K A Subramanian. A Natural History of Odonata. We have all held them by their wings, made them lift pebbles from our palms, tied their tails to paper flags and watched them flyaway, wondering all the while where and how they lived and what they did. I only knew that we called them ...

  4. Nature Detectives

    Science.gov (United States)

    Harr, Natalie; Lee, Richard E.; Jr.

    2010-01-01

    Richard Louv's "Last Child in the Woods" (2008) added to a growing consensus to get children outside and experiencing nature. Using ideas from place-based education, the authors present a simple year-long project that brings science, nature, and other curriculum standards to life right in your school yard. With a focus on journaling, this project…

  5. Matematica Natural.

    Science.gov (United States)

    Lozano, Patricia; Medearis, Linda

    Matematica Natural (Natural Mathematics) is a mathematics curriculum for young children based on the assumption that they learn mathematics through concrete, real life, relevant experiences and that educational differences rather than cultural differences influence math achievement. The curriculum uses hands-on materials and activities to teach…

  6. Natur formet

    DEFF Research Database (Denmark)

    Søberg, Martin

    2011-01-01

    Anmeldelse af Malene Hauxner, "Fra naturlig natur til SUPERNATUR – Europæisk landskabsarkitektur 1967-2007 set fra Danmark", Risskov: Ikaros Press, 2011.......Anmeldelse af Malene Hauxner, "Fra naturlig natur til SUPERNATUR – Europæisk landskabsarkitektur 1967-2007 set fra Danmark", Risskov: Ikaros Press, 2011....

  7. Framing nature

    NARCIS (Netherlands)

    Jansen, Peter

    2017-01-01

    This PhD thesis is about communication concerning nature in the Netherlands. The purpose of this exploratory study is to take both a theoretical and an empirical look at whether (implicit) religious elements play a role in this communication about nature in the Netherlands.   In this PhD thesis

  8. Dissonant Nature

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2013-01-01

    Nature restoration is far from being a neural undertaking. Just like any other type of heritage production it can be the source of dissonance – ‘our’ nature is not necessary ‘their’ nature. Often this dissonance is managed in ways, which are not particular sensitive to site......-specificity. As exemplified by the Skjern River Restoration Project (1999-2003), one interpretation of the landscape sometimes suppresses other valid interpretations neglecting its diverse history. Landscape architecture might, however, provide an alternative approach to nature restoration that is more site specific...... and allows for multiple interpretations to coexist. Evidence can be found in the Re-naturalization of River Aire (2002-2015), a restoration project, which reveals approaches that could be labelled landscape architecture specific....

  9. Evaluación de las técnicas de atenuación natural, bioventing, bioaumentación y bioaumentación- bioventing, para la biodegradación de diésel en un suelo arenoso, en experimentos en columna

    Directory of Open Access Journals (Sweden)

    Angélica María Muskus Morales

    2013-08-01

    Full Text Available El presente estudio fue desarrollado dentro del convenio de cooperación institucional realizado entre laUniversidad Pontifi cia Bolivariana, Seccional Bucaramanga y el Instituto Colombiano de Petróleos – ICP, con el fi nde dar solución a una problemática que se presenta en las zonas de manejo de hidrocarburos, donde se evidenciansuelos arenosos contaminados con diésel hasta concentraciones del 6% y a una profundidad máxima de 80 cm.Para el desarrollo metodológico se contaminó un suelo artifi cialmente con diésel para evaluar las técnicas deBioventing, Atenuación Natural, Bioaumentación y Bioventing-Bioaumentación, utilizando montajes en columnas.Se defi nieron los parámetros de diseño y seguimiento como dimensiones de las columnas, caudal de entrada,concentración de diésel, oxígeno disuelto y crecimiento bacteriano; para la bioaumentación se inoculó el suelocon un consorcio bacteriano producido por el ICP. Se realizaron los montajes experimentales por triplicado y secontroló el proceso durante cuatro meses. Los resultados obtenidos mostraron que en la técnica de Bioventingse obtuvieron porcentajes de remoción de diésel hasta del 97%. Con la técnica de Bioventing-Bioaumentación sealcanzaron porcentajes de remoción hasta del 75% y con las técnicas de Atenuación Natural y Bioaumentación,los porcentajes de remoción no superaron el 48%. El estudio mostró que el consorcio bacteriano utilizado yevaluado mediante las técnicas de Bioaumentación y Bioventing-Bioaumentación, no potencializó la efi cienciade los procesos de biorremediación del suelo arenoso contaminado con diésel.

  10. The relationship between the industry of natural gas and the sector of electric power: perspectives for the united development of such segments in Bahia; Estudo da industria do gas natural e sua relacao com o setor eletrico na Bahia: perspectivas para uma integracao sinergica entre tais segmentos

    Energy Technology Data Exchange (ETDEWEB)

    Prates, Daniel O. [PETROBRAS, Rio de Janeiro, RJ (Brazil); Rocha, Georges S. [Bahia Univ., Salvador, BA (Brazil). Dept. de Engenharia Quimica. Curso de Especializacao em Engenharia do Gas Natural

    2005-07-01

    The industry of natural gas is finding great inter-relationship with the electric power section due to aspects technical, economical and institutional. In Brazil, this world tendency is increasing quickly, above all, starting from the crisis of energy lived by the Country in 2001. In spite of, in spite of being the third producing largest and consume-pain in Brazil, Bahia now is deficient in natural gas, committing the thermal-electricity generation due to lack of this energy one as well as, of the deficiency in the transport and distribution infrastructure. Besides, Bahia is the Brazilian state with the largest population without access the electric power. This motivates reflections concerning the potentialities of the natural gas to lessen this situation. Therefore, this work has an objective to evaluate the structures of the industry of the natural gas and the electric section in Bahia and the relationship among these segments. Initially, it tries to present the reasons that it is taking the development of the electric power generation in consonance with the industry of the gas. Soon afterwards, it comes a retrospective abbreviation of the electric power generation in Brazil and in Bahia, emphasizing the recent tendency of use of the natural gas for the thermal-electricity generation. In the following point, it talks about the reservations and production of natural gas and he/she comes the structure of commercialization of gas from the production/importation to the distribution in Brazil and in Bahia. To proceed, the investment plans are evaluated for the enlargement of the production, transport and distribution of natural gas and electricity in Bahia. Finally, the article is concluded being discussed the difficulties and perspectives of increase and integration of the segments of natural gas and electric power in Bahia, tends in view the institutional aspects, technique and economical of a model that influences the use of the natural gas and contribute to the

  11. RedeGasEnergia - gas and energy excellence network: a strategy for development the Brazilian natural gas market; RedeGasEnergia - rede de excelencia de gas e energia: uma estrategia para o desenvolvimento do mercado do gas natural no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Antonio L.F. dos [PETROBRAS, Rio de Janeiro, RJ (Brazil). Gerencia de Tecnologia do Gas Natural; Freire, Luiz G.M. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Coordenacao de Tecnologia da RedeGasEnergia

    2004-07-01

    The present work aims at to present a new methodology of Excellency Net of Natural Gas - RedeGasEnergia for the development do natural gas market no Brazil, through in the application do model management for technologies associates different segments da economy: residential, commercial, industrial, Vehicle and of cogeneration, in accord with the Strategical Planning of the PETROBRAS. The developed methodology is based on the interaction enters the technological lines of direction of the segments of the economy and marketing lines of direction, inside of a corporative environment enters the some agents of the productive chain of the Natural Gas, which is: University, the delivering and transporting Institutions of Research and Technologies (technological arm) and companies of NG, municipal, state and federal equipment manufacturers (enterprise arm) and agencies, trade associations (governmental arm) to which of integrated and articulated form carry through a sustainable development of the Natural Gas market in Brazil. A study of case of the methodology will be shown, from the analysis of the current scenes of the use of the natural gas in light vehicles and weighed, locomotives and boats, as well as the available infrastructure for the Vehicle applications. (author)

  12. Water treatment by multistage filtration system with natural coagulant from Moringa oleifera seeds Tratamento de água para abastecimento pelo sistema filme com extrato de sementes de Moringa oleifera

    Directory of Open Access Journals (Sweden)

    Monalisa Franco

    2012-10-01

    Full Text Available This study presents an evaluation of a pilot multistage filtration system (MSF with different dosages, 131 mg L-1 and 106 mg L-1, of the natural coagulant extracted from Moringa oleifera seeds in pre-filtration and slow filtration stages, respectively. The system was comprised by a dynamic pre-filter unit, two upflow filters in parallel and four slow filters in parallel, and in one of the four filters had the filter media altered. The performance of the system was evaluated by monitoring some water quality parameters such as: turbidity, apparent color and slow filter load loss. The stages that have received the coagulant solution had better treatment efficiency compared with the steps without it. However, the direct application of the coagulant solution in the slow filter caused rapid clogging of the non-woven blanket and shorter career length.O trabalho apresenta uma avaliação do sistema-piloto de filtração em múltiplas etapas, com aplicação de diferentes dosagens (131 mg L-1 e 106 mg L-1 do coagulante natural extraído de sementes de Moringa oleifera, nas etapas de pré-filtração e filtração lenta, respectivamente. O sistema foi constituído por uma unidade de pré-filtro dinâmico, duas unidades de pré-filtros de fluxo ascendente em paralelo e quatro unidades de filtros lentos em paralelo, sendo que, em um dos filtros lentos, houve variação do meio filtrante. O desempenho do sistema foi avaliado por meio de parâmetros como turbidez, cor aparente e perda de carga dos filtros lentos. As etapas que receberam a solução coagulante tiveram maior eficiência de tratamento se comparadas com as etapas sem o recebimento da mesma. Entretanto, a aplicação direta da suspensão coagulante no filtro lento causou rápida colmatação da manta e menor tempo de duração da carreira.

  13. Registro recente de harpia, Harpia harpyja (Linnaeus (Aves, Accipitridae, na Mata Atlântica da Reserva Natural Vale do Rio Doce, Linhares, Espírito Santo e implicações para a conservação regional da espécie Recent record of harpy eagle, Harpia harpyja (Linnaeus (Aves, Accipitridae, in Atlantic forest of Vale do Rio Doce Natural Reserve, Linhares, Espírito Santo, Brazil and implications for the regional conservation of the species

    Directory of Open Access Journals (Sweden)

    Ana C. Srbek-Araujo

    2006-12-01

    Full Text Available A presente comunicação reporta o registro de um macho adulto de harpia, Harpia harpyja (Linnaeus, 1758, na Reserva Natural da Vale do Rio Doce (RNVRD, região norte do Espírito Santo, em agosto de 2005. A análise deste e de registros históricos da espécie nesta reserva indica a presença de uma população residente na região compreendida pela RNVRD e pela Reserva Biológica de Sooretama. Estas duas reservas, contíguas entre si, compreendem cerca de 46250 ha de Floresta Atlântica de baixada (Mata de Tabuleiro, na sua maior parte bem conservada. Além da grande extensão de floresta, a rica e densa fauna de mamíferos presente nestas reservas contribuem para a permanência das harpias na região.The present communication reports an observation occurred in August 2005 of the harpy eagle, Harpia harpyja (Linnaeus, 1758, in the Vale do Rio Doce Natural Reserve (VRDNR, located in northern Espírito Santo state, southeastern Brazil. The analysis of this and past records of the species in this reserve indicates the presence of a resident population in the region encompassed by the VRDNR and the Sooretama Biological Reserve. These two reserves total circa 46,250 ha of lowland Atlantic forest (Tabuleiros forest, which are mostly well preserved. Besides the great extension of forests, the rich and abundant mammal fauna present in these two reserves contribute to the regional permanence of the harpy eagle.

  14. Assessment of environmental impact models in natural occurring radionuclides solid wastes disposal from the mineral industry; Avaliacao de modelos de impacto ambiental para deposicao de residuos solidos com radionuclideos naturais em instalacoes minero-industriais

    Energy Technology Data Exchange (ETDEWEB)

    Pontedeiro, Elizabeth May Braga Dulley

    2006-07-15

    This work evaluates the behavior of wastes with naturally occurring radionuclides as generated by the mineral industry and their final disposal in landfills. An integrated methodology is used to predict the performance of an industrial landfill for disposal of wastes containing NORM/TENORM, and to define acceptable amounts that can be disposed at the landfill using long-term environmental assessment. The governing equations for radionuclide transport are solved analytically using the generalized integral transform technique. Results obtained for each compartment of the biogeosphere are validated with experimental results or compared to other classes of solutions. An impact analysis is performed in order to define the potential consequences of a landfill to the environment, considering not only the engineering characteristics of the waste deposit but also the exposure pathways and plausible scenarios in which the contaminants could migrate and reach the environment and the human population. The present work permits the development of a safety approach that can be used to derive quantitative waste acceptance criteria for the disposal of NORM/TENORM waste in landfills. (author)

  15. Demand for natural gas from industries in Brazil: an estimate of the price elasticity, income elasticity and forecast for 2008-2012 using VEC (Vector Error Correction) Model; Demanda por gas natural no Brasil: um estudo sobre as elasticidades preco e renda de longo prazo do segmento industrial e estimativa para o periodo de 2008-2012 usando modelo VEC (Vector Error Correction)

    Energy Technology Data Exchange (ETDEWEB)

    Cabral, Renata [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Economia e Administracao; Parente, Virginia [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia

    2008-07-01

    The purpose of the present study is to estimate the long-run elasticities - manly price and income - of the demand for gas natural in the industrial category. After determining that the series under study were non-stationary, we chose to use the cointegration approach, estimating a Vector Error Correction Model (VEC Model). The obtained results show that the price elasticity for industrial sector in Brazil is higher than income elasticity. Although both of then is near to one, the price elasticity is higher that one unit while income elasticity is slightly lower. Predictions for the gas natural consumption in Brazil for industrials for 2008-2012 period are also made. (author)

  16. Impactos Ambientais do Alquil benzeno Sulfonado Linear

    Directory of Open Access Journals (Sweden)

    reinaldo fontes Cavalcante

    2014-08-01

    Full Text Available O uso de surfactantes tem crescido em todo o planeta níveis exponenciais e o alquil benzeno sulfonado linear(LAS é o surfactante aniônico mais utilizado em todo o globo com uma produção anual de 2,8 milhões de toneladas. Devido a isso cresce a preocupação com os efeitos adversos que a disposição inadequada desta substância acarreta para o meio terrestre e o meio aquático. A ação nociva, do surfactante LAS, a vida da biota destes ambientes se dão principalmente devido a ruptura da membrana celular através da interação com os componentes lipídicos, e a reação com enzimas fundamentais para o funcionamento das células, efeitos estes intensificados pela sua concentração. Nos ambientes aquáticos o LAS pode acarretar alterações nas taxas de oxigenação natural,deficiência na reprodução de peixes e invertebrados, eutrofização e situações de escassez qualitativa de recursos hídricos. foi observado que os efluentes de origem doméstica são os principais contribuintes do Alquil benzeno sulfonado Linear(LAS e que a degradação biológica do LAS pode ocorrer a níveis de eficiência que chegam a 80% e ainda que pode ser potencializada com a ação combinada com processos físico químicos. Concentrações abaixo de 0,29mg/L reduzem seus efeitos nocivos sendo o tratamento deste surfactantes aniônico um fator estratégico para o incremento da oferta hídrica e da preservação dos recursos naturais da região.

  17. Guía Docente para utilizar el Museo del Agua Yaku y el Museo de la Ciudad como recurso para la enseñanza-aprendizaje del entorno natural y social en tercero de Educación Básica

    OpenAIRE

    Zavala Chávez, Carmen Alexandra

    2010-01-01

    This product is a proposal to use the City Museum and the Museum of Water (Yaku) through the process of teaching and learning the natural and social environment for children from third base. This product tries to be a tool for teaching basic third, allowing work creatively in visits to museums before, during and after it. To which is taken as a reference to the following authors: Jean Piaget, Lev S. Vygotsky, Arnold Gesell, David Ausubel, Erikson and the Consensus Proposal Module Curriculum R...

  18. Writing Nature

    Directory of Open Access Journals (Sweden)

    Kristin Asdal

    2014-06-01

    Full Text Available This special issue of the Nordic Journal of Science and Technology Studies is interested in how nature, in different versions and forms, is invited into our studies, analyses, and stories. How is it that we “write nature”? How is it that we provide space for, and actually describe the actors, agents, or surroundings, in our stories and analyses? The articles in the issue each deal with different understandings of both the practices of writing and the introduction of various natures into these. In this introduction to the issue the editors engage with actor-network theory as a material semiotic resource for writing nature. We propose to foreground actor-network theory as a writing tool, at the expense of actor-network theory as a distinct vocabulary. In doing this and pointing out the semiotic origins to material-semiotics we also want to problematize a clear-cut material approach to writing nature.

  19. Natural Communities

    Data.gov (United States)

    Kansas Data Access and Support Center — This dataset shows the locations of known tracts of high quality natural communities in Kansas, generalized to the PLSS section. It is not a compehensive dataset of...

  20. Pluralising Nature

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2017-01-01

    Denmark is recognised for its democratic approach to planning, and for the idea of planning for the common good. This interest in the common good and in common values also seems to be reflected in the way that the restoration of nature is planned and managed, suggesting that there is one common...... “nature” that everyone can agree on. But nature restoration is far from being an unproblematic undertaking. As with any other type of heritage production, it can be the source of dissonance. As exemplified by the Skjern River Restoration Project, one perception of a landscape and its value as “nature” can...... suppress other valid perceptions, in conflict with the need for different groups of people to be able to identify with the same territory. However, planning for the common good, in the case of nature restoration, does not necessarily mean planning for one common nature. Understanding and working...

  1. Natural Propositions

    DEFF Research Database (Denmark)

    Stjernfelt, Frederik

    Preface -- Introduction -- The generality of signs -- Dicisigns -- Some consequences of the dicisign doctrine -- Dicisigns and cognition -- Natural propositions--the evolution of semiotic self-control -- Dicisigns beyond language -- Operational and optimal iconicity in Peirce's diagrammatology...

  2. Concentration levels of alpha emitting radionuclides in natural waters. Implications in the use of various radionuclides of reference for the determination of total alpha activity index; Niveles de concentracion de radionucleidos emisores alfa en aguas de origen natural. Implicaciones en el uso de los distintos radionucleidos de referencia para la determinacion del indice de actividad total alfa

    Energy Technology Data Exchange (ETDEWEB)

    Corbacho, J. A.; Baeza, A.; Guillen, J.; Valles, I.; Serrano, I.; Camacho, A.; Montana, M.

    2013-07-01

    The present study was carried out a statistical evaluation of the natural radioactive contents of a large number of water samples collected at different points of the Spanish geography, in order to meet its controlling radioactive composition and assessing the implications of total alpha activity index can have in this type of samples. (Author)

  3. Natural aphrodisiacs.

    Science.gov (United States)

    Shamloul, Rany

    2010-01-01

    The search for a remedy or a prescription that can enhance sexual function and/or treat male erectile dysfunction has been an obsession throughout known history. Whether it was an Eastern civilization or a Western one, religious or atheist, man's aspiration for a better or best "manhood" has been a history-time goal. This review will discuss the current research done on the most popular natural aphrodisiacs and examine the weight of evidence to support or discourage the use of any of these substances to enhance sexual desire and/or function. Review of the current evidence on the use of natural substances as aphrodisiacs. Efficacy of natural aphrodisiacs in enhancing sexual function in men and women. There is little evidence from literature to recommend the usage of natural aphrodisiacs for the enhancement of sexual desire and/or performance. Data on yohimbine's efficacy does not support the wide use of the drug, which has only mild effects in the treatment of psychogenic ED. Although there's a positive trend towards recommending ginseng as an effective aphrodisiac, however, more in depth studies involving large number of subjects and its mechanism of action are needed before definite conclusions could be reached. Data on the use of natural aphrodisiacs in women is limited. The current body of objective evidence does not support the use of any natural aphrodisiac as an effective treatment for male or female sexual dysfunctions. Potent men and men with ED will continue the search for natural aphrodisiacs despite the current disappointing data on their effectiveness. Care should be taken regarding the fraud addition of sildenafil analogues to natural aphrodisiacs.

  4. Aplicação do método de ensaio das frequências naturais de vibração para obtenção do módulo de elasticidade de peças estruturais de madeira Analysis of the natural vibration frequency test method to obtain the modulus of elasticity of wood structural components

    Directory of Open Access Journals (Sweden)

    Pedro Gutemberg de Alcântara Segundinho

    2012-12-01

    Full Text Available Existem diversas técnicas para caracterização do módulo de elasticidade de madeiras e, dentre as atualmente empregadas, destacam-se aquelas que utilizam as frequências naturais de vibração, por serem técnicas não destrutivas e, portanto, apresentarem resultados que podem ser repetidos e comparados ao longo do tempo. Este trabalho teve como objetivo avaliar a eficácia, dos métodos de ensaios baseados nas frequências naturais de vibração comparando-os aos resultados obtidos na flexão estática na obtenção das propriedades elásticas em peças estruturais de madeira de reflorestamento que são usualmente empregadas na construção civil. Foram avaliadas 24 vigas de Eucalyptus sp. com dimensões nominais (40 x 60 x 2.000 mm e 14 vigas de Pinus oocarpa com dimensões nominais (45 x 90 x 2.300 mm, ambas sem tratamento; 30 pranchas com dimensões nominais (40 x 240 x 2.010 mm e 30 pranchas com dimensões nominais (40 x 240 x 3.050 mm, ambas de Pinnus oocarpa e com tratamento preservativo à base de Arseniato de Cobre Cromatado - CCA. Os resultados obtidos apresentaram boa correlação quando comparados aos resultados obtidos pelo método mecânico de flexão estática, especialmente quando empregada a frequência natural de vibração longitudinal. O emprego da frequência longitudinal mostrou-se confiável e prático, portanto recomendada para a determinação do módulo de elasticidade de peças estruturais de madeira. Verificou-se ainda que, empregando a frequência longitudinal, não há necessidade de um suporte específico para os corpos de prova ou calibrações prévias, reduzindo assim o tempo de execução e favorecendo o ensaio de grande quantidade de amostras.There are several techniques to characterize the elastic modulus of wood and those currently using the natural frequencies of vibration stand out as they are non-destructive techniques, producing results that can be repeated and compared over time. This study reports

  5. Subvenciones para instituciones

    International Development Research Centre (IDRC) Digital Library (Canada)

    IDRC CRDI

    Subvenciones para instituciones Directrices para gastos de proyectos aceptables. GFAPE-09-2015. 2 ... más de 5.000 CAD. Los costos pueden incluir el precio base de compra, costos de transporte y otros ... personas que recogen datos e información o que trabajan de manera eventual, el mantenimiento y la operación de ...

  6. Development of the Ni/Al{sub 2}O{sub 3}/ZrO{sub 2} catalyst to steam reforming of the natural gas process; Desenvolvimento do catalisador Ni/Al2O3/ZrO2 para o processo de reforma do gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Neiva, Laedna Souto; Ramalho, Melanea A.F.; Costa, Ana Cristina Figueiredo de Melo; Gama, Lucianna [Universidade Federal de Campina Grande (UFCG), PB (Brazil); Andrade, Heloysa M.C. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Kiminami, Ruth Herta G.A. [Universidade Federal de Sao Carlos (UFSCAR), SP (Brazil)

    2008-07-01

    The aim of this work is to develop catalyst of the type Ni/{alpha}-Al{sub 2}O{sub 3} modified with 0.005 mol of ZrO{sub 2} and structural, morphologic and catalytic characterizations, aiming employ in the reforming process of the natural gas. The catalytic supports were obtained by synthesis method for combustion reaction according to the concepts of the propellants chemistry. The active species of the catalyst (nickel) was deposited over the support by humid impregnation method. The catalytic supports were characterized by XRD, morphologic analysis by SEM and TEM, textural analysis by BET method before and after of the impregnation with nickel and were done catalytic tests in laboratory. The catalytic supports shows structure without any secondary phase with crystallinity elevated degree and crystal size varying between 5.7 and 7.0 nm. The catalytic test shows that these catalysts promoted a conversion percentile considerable of the natural gas in syngas. (author)

  7. Development of the natural gas engine Mercedes-Benz 12 liters given the limits of the law of EEV (Enhanced Environmentally Friendly Vehicle) emissions below the prescribed limits; Desenvolvimento do motor a gas natural Mercedes-Bens 12 litros atendendo os limites da legislacao de emissoes EEV (Enhanced Environmentally Friendly Vehicle) inferiores aos limites prescritos para Euro 5

    Energy Technology Data Exchange (ETDEWEB)

    Marques Neto, J.A.; Wunderlich, C.; Miletovic, C.; Biazetti, W. [DaimlerChrysler do Brasil Ltda., Sao Bernardo do Campo, SP (Brazil)

    2004-07-01

    The development of combustion for engines, has been focused in reducing of pollutants emissions limits and the compressed natural gas, as a fuel, achieves good results, resulted by the combustion dynamic from Otto cycle, values under the lower specific emissions limits, if compared with diesel cycle engines. Although the optimization of fuel maps and the using of a two-ways oxidation catalysator, in function of the lower particulate matters emissions, was possible to get the engine certification by TUV Germany in agreement with the EEV emissions limits. To sum up, this paper has principal subject to present the natural gas engine M447hLAG powered by Mercedes-Benz with power 240 kW and torque 1250 Nm , as a commercial advantage for markets with the respective legislation with lower emissions limits. (author)

  8. Natural Disaster and Natural Selection

    OpenAIRE

    Uchida, Hirofumi; Miyakawa, Daisuke; Hosono, Kaoru; Ono, Arito; Uchino, Taisuke; Uesugi, Iichiro

    2013-01-01

    In this paper, we investigate whether a natural selection mechanism works for firm exit. By using data of firms after a devastating earthquake, the Greeat Tohoku Earthquake, we examine the impact of firm efficiency on firm exit both inside and outside the earthquake-affected areas. We find evidence suggesting that more efficeint firms are less likely to exit both inside and outside the affected areas, which supports the natural selection mechanism. However, we also find that the mechanism is ...

  9. Technical and economical analysis for the implementation of small scale GTL (Gas-to-liquids) technology to monetizing the associated remote offshore stranded natural gas in Brazil; Analise tecnica e economica da aplicacao da tecnologia GTL de pequena escala para a monetizacao do gas natural associado remoto offshore no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Castelo Branco, David Alves

    2008-02-15

    The volume of stranded natural gas global reserves is substantial and represents more than a third of the world's proven natural gas reserves. In Brazil, recent discoveries operated by PETROBRAS, with participation of other companies, show trend of stranded gas reserves incorporation, associated gas or not. This dissertation's main objective is to make a technical and economic analysis of the implementation of small-scale GTL technology for the exploitation of stranded associated natural gas offshore in Brazil. Thus, the dissertation held, initially, a survey of the processes of gasification and the manufacturers with technologies and projects based on these processes, for specific offshore applications. In a second stage, the conditions of the offshore environment were examined. After the confrontation of the technologies available and the operation conditions, a technological alternative has been chosen to be used in an illustrative economic analysis. The results show that GTL offshore option becomes viable at a minimum price of about US $ 40.00 / barrel. Although this value is greater than the robustness price adopted by PETROBRAS, there are prospects for the reduction of GTL technology costs. (author)

  10. Descripción del diseño y construcción de un deposito de hormigón pretensado para 80.000 m2 de capacidad de gas natural licuado. España

    Directory of Open Access Journals (Sweden)

    Fernández de la Reguera, Ramón

    1981-08-01

    Full Text Available La construcción de un nuevo depósito de 80.000 m3>/sup> de capacidad para almacenamiento de gas natural licuado en la Planta que la Empresa Nacional del Gas, S A. (ENAGAS tiene en Barcelona, ha sido realizada por la Empresa Auxiliar de la Industria, S/A. (AUXINI en Agrupación Temporal con PRELOAD SISTEMAS. Esta obra, una de las últimas realizaciones mundiales en el sector, consistente en doble pared de hormigón pretensado, ha permitido a AUXINI constituirse en una de las empresas líderes de la joven y dinámica tecnología criogénica, aportando soluciones constructivas adecuadas para este tipo de depósitos. En el trabajo que sigue se hace hincapié en la descripción del depósito indicando los pormenores constructivos del mismo, tales como la construcción y montaje de la chapa del muro interno, así como el pretensado horizontal tipo Preload utilizado, además de otros procedimientos constructivos como la elevación de la cúpula, la soldadura de la chapa 9% Ni, etc. Este depósito incorpora los últimos requisitos de seguridad que se exigen en el Proyecto de ese tipo de almacenamiento y, por las numerosas innovaciones que se han introducido durante su construcción, ha constituido una obra pionera en su género y de carácter mundial.

  11. Emancipating Nature

    DEFF Research Database (Denmark)

    Munk, Anders Kristian

    2012-01-01

    The issue of riverine flooding in the UK is closely tied up with computer simulations. Arguably, these modelling practices are ripe with the anticipation of nature. They aspire to pre-empt it, hence expect it to be ‘out there’, and ultimately work through formalized distillations of it – hydrodyn......The issue of riverine flooding in the UK is closely tied up with computer simulations. Arguably, these modelling practices are ripe with the anticipation of nature. They aspire to pre-empt it, hence expect it to be ‘out there’, and ultimately work through formalized distillations...... of it – hydrodynamic equations – which have their own anticipations and place their own demands on their modellers. Through the experience of a flood modelling apprenticeship I argue that the taking-place of such anticipations paradoxically relies on the birth of a hybrid, the model-modeller, and thus on a nature...

  12. Provincialising Nature

    DEFF Research Database (Denmark)

    Provincialising Nature: Multidisciplinary Approaches to the Politics of the Environment in Latin America offers a timely analysis of some of the crucial challenges, contradictions and promises within current environmental discourses and practices in the region. This book shows both challenging...... scenarios and original perspectives that have emerged in Latin America in relation to the globally urgent issues of climate change and the environmental crisis. Two interconnected analytical frameworks guide the discussions in the book: the relationship between nature, knowledge and identity and their role...

  13. Natural pedagogy.

    Science.gov (United States)

    Csibra, Gergely; Gergely, György

    2009-04-01

    We propose that human communication is specifically adapted to allow the transmission of generic knowledge between individuals. Such a communication system, which we call 'natural pedagogy', enables fast and efficient social learning of cognitively opaque cultural knowledge that would be hard to acquire relying on purely observational learning mechanisms alone. We argue that human infants are prepared to be at the receptive side of natural pedagogy (i) by being sensitive to ostensive signals that indicate that they are being addressed by communication, (ii) by developing referential expectations in ostensive contexts and (iii) by being biased to interpret ostensive-referential communication as conveying information that is kind-relevant and generalizable.

  14. Natural aerodynamics

    CERN Document Server

    Scorer, R S

    1958-01-01

    Natural Aerodynamics focuses on the mathematics of any problem in air motion.This book discusses the general form of the law of fluid motion, relationship between pressure and wind, production of vortex filaments, and conduction of vorticity by viscosity. The flow at moderate Reynolds numbers, turbulence in a stably stratified fluid, natural exploitation of atmospheric thermals, and plumes in turbulent crosswinds are also elaborated. This text likewise considers the waves produced by thermals, transformation of thin layer clouds, method of small perturbations, and dangers of extra-polation.Thi

  15. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 2; Issue 2. Nature Watch Decline of a Montane Ecosystem. Kartik Shanker. Feature Article Volume 2 Issue 2 February 1997 pp 75-82. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/002/02/0075-0082 ...

  16. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 3; Issue 8. Nature Watch - Hornbills – Giants Among the Forest Birds. T R Shankar Raman Divya Mudappa. Feature Article Volume 3 Issue 8 August 1998 pp 56-65. Fulltext. Click here to view fulltext PDF. Permanent link:

  17. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 9; Issue 9. Nature Watch - Coral Reefs and their Fauna: An Underwater Fantasyland. Anuradha Bhat. Feature Article Volume 9 Issue 9 September 2004 pp 62-73. Fulltext. Click here to view fulltext PDF. Permanent link:

  18. Nature Watch

    Indian Academy of Sciences (India)

    Annual Meetings · Mid Year Meetings · Discussion Meetings · Public Lectures · Lecture Workshops · Refresher Courses · Symposia · Live Streaming. Home; Journals; Resonance – Journal of Science Education; Volume 7; Issue 7. Nature Watch - Tent-making Bats. N Gopukumar J Balasingh. Feature Article Volume 7 Issue ...

  19. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 3. Nature Watch Diversity of Bats. G Marimuthu. Feature Article Volume 1 Issue 3 March 1996 pp 103-110. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/001/03/0103-0110. Author Affiliations.

  20. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 2; Issue 5. Nature Watch Will the Meek Inherit the Earth? Kartik Shanker. Feature Article Volume 2 Issue 5 May 1997 pp 54-59. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/002/05/0054-0059 ...

  1. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 19; Issue 8. Nature Watch: On the Trail of Skinks of the Western Ghats. Anirudha Datta-Roy. Feature Article Volume 19 Issue 8 August 2014 pp 753-763. Fulltext. Click here to view fulltext PDF. Permanent link:

  2. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 3. Nature Watch Diversity of Bats. G Marimuthu. Feature Article Volume 1 Issue 3 March 1996 pp 103-110. Fulltext. Click here to view fulltext PDF. Permanent link: https://www.ias.ac.in/article/fulltext/reso/001/03/0103-0110. Author Affiliations.

  3. Nature Watch

    Indian Academy of Sciences (India)

    After the 1960s man's attention was diverted towards the Thar ... effects also. The alluvial and inter-dunal plains have gypsiferous hard pen sediments, which are responsible for serious water logging and salinity-alkalinity problems. Moreover, natural surface drainage system is absent and the ground water is highly saline.

  4. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 8. Nature Watch - Secrets of the Shieldtails. Kartik Shanker. Feature Article Volume 1 Issue 8 August 1996 pp 64-70. Fulltext. Click here to view fulltext PDF. Permanent link: https://www.ias.ac.in/article/fulltext/reso/001/08/0064-0070 ...

  5. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 6; Issue 7. Nature Watch - Singapore's Jurong BirdPark: A Study Model. Abraham Verghese. Feature Article Volume 6 Issue 7 July 2001 pp 74-88. Fulltext. Click here to view fulltext PDF. Permanent link:

  6. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 4; Issue 7. Nature Watch - The Odyssey of the Olive Ridley. Kartik Shanker. Feature Article Volume 4 Issue 7 July 1999 pp 68-78. Fulltext. Click here to view fulltext PDF. Permanent link: https://www.ias.ac.in/article/fulltext/reso/004/07/0068-0078 ...

  7. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 14; Issue 12. Nature Watch - Sarus Crane: On its Way to Extinction. Alok Kumar Mishra. Feature Article Volume 14 Issue 12 December 2009 pp 1206-1209. Fulltext. Click here to view fulltext PDF. Permanent link:

  8. Kritikkens natur

    DEFF Research Database (Denmark)

    Schatz-Jakobsen, Claus

    1999-01-01

    Artiklen introducerer det nye forskningsfelt inden for samtænkning af litteratur, kultur og natur, den såkaldt økologiske kritik, og kaster et kritisk blik på  dens brug af romantisk litteratur som proto-økologisk kanon....

  9. Nature Watch

    Indian Academy of Sciences (India)

    Nature Watch - Tracking Turtles through Time and Space. Kartik Shanker. General Article Volume 7 Issue 6 June 2002 ... Keywords. Turtles; animal navigation; conservation biology; nesting behaviour; telemetry. Author Affiliations. Kartik Shanker1. Wildlife Institute of India PO Box 18, Chandrabani Dehradun 248001, India.

  10. Nature Watch

    Indian Academy of Sciences (India)

    ... Lecture Workshops · Refresher Courses · Symposia · Live Streaming. Home; Journals; Resonance – Journal of Science Education; Volume 3; Issue 5. Nature Watch - Thinking Like a Tahr: When Males and Females go their Separate Ways. M D Madhusudan. Feature Article Volume 3 Issue 5 May 1998 pp 43-47 ...

  11. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 2; Issue 10. Nature Watch The Amazing Desert Gerbil. Ishwar Prakash. Feature Article Volume 2 Issue 10 October 1997 pp 54-61. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/002/10/0054-0061 ...

  12. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 20; Issue 3. Nature Watch: Symbiosis in Coastal Marine Communities. Neelam Pereira. Feature Article Volume 20 Issue 3 March 2015 pp 245-253. Fulltext. Click here to view fulltext PDF. Permanent link:

  13. Natural fibers

    Science.gov (United States)

    Craig M. Clemons; Daniel F. Caulfield

    2005-01-01

    The term “natural fibers” covers a broad range of vegetable, animal, and mineral fibers. However, in the composites industry, it usually refers to wood fiber and agrobased bast, leaf, seed, and stem fibers. These fibers often contribute greatly to the structural performance of the plant and, when used in plastic composites, can provide significant reinforcement. Below...

  14. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 8. Nature Watch - Secrets of the Shieldtails. Kartik Shanker. Feature Article Volume 1 Issue 8 August 1996 pp 64-70. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/001/08/0064-0070 ...

  15. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 7; Issue 10. Nature Watch - When Dragons Fly. K A Subramanian. Feature Article Volume 7 Issue 10 October 2002 pp 69-78. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/007/10/0069-0078 ...

  16. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 6; Issue 8. Nature Watch - The Treasures of the Night Sky. P N Shankar B S Shylaja. Feature Article Volume 6 Issue 8 August 2001 pp 82-89. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/006/08/0082- ...

  17. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 1. Nature Watch The Kokum Tree. M D Subash Chandran. Feature Article Volume 1 Issue 1 January 1996 pp 86-89. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/001/01/0086-0089 ...

  18. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 6; Issue 7. Nature Watch - On Observing the Night Sky. P N Shankar B S Shylaja. Feature Article Volume 6 Issue 7 July 2001 pp 89-96. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/006/07/0089-0096 ...

  19. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 1; Issue 4. Nature Watch The Ancient Mariners. Kartik Shanker. Feature Article Volume 1 Issue 4 April 1996 pp 50-57. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/001/04/0050-0057. Author Affiliations.

  20. Nature Watch

    Indian Academy of Sciences (India)

    2016-08-26

    Aug 26, 2016 ... ... 20; Issue 1. Nature Watch: A Tale of Two Turtles. V Deepak. Feature Article Volume 20 Issue 1 January 2015 pp 47-54. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/020/01/0047-0054. Keywords. Ecology; endemic; India; turtles; tortoises; Western Ghats.

  1. Nature Watch

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 4; Issue 7. Nature Watch - The Odyssey of the Olive Ridley. Kartik Shanker. Feature Article Volume 4 Issue 7 July 1999 pp 68-78. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/004/07/0068-0078 ...

  2. Using of natural gas as complementary fuel in Big G T systems for the cogeneration in the sugar and alcohol sector; Uso del gas natural como combustible complementario en sistemas Big GT para la cogeneracion en el sector de azucar y alcohol

    Energy Technology Data Exchange (ETDEWEB)

    Ponce Arrieta, Felipe Raul; Silva Lora, Electo [Escola Federal de Engenharia de Itajuba (EFEI), MG (Brazil). Nucleo de Estudos de Sistemas Termicos (NEST)]. E-mail: aponce@iem.efei.br

    2000-07-01

    From the integration analysis of BIG GT (Biomass Integrated Gasifier Gas Turbine) block systems in sugar plants of 150, 300 and 800 tc/h by using different natural gas and bagasse ratios, the electric power quantities generated and costs are calculated, showing that the lowest electric power generation costs are obtained when investments are applied for reducing the the process steam consumption. Also, environmental considerations are performed, warning for the impact which could be obtained on the power cost generation by applying fossil fuel, when penalties are applied with a eco-tax of US$ 100/carbon-ton emitted.

  3. Numerical simulation of the performance and economical study of three cookers: solar, hybrid (solar and natural gas) and a LPG (Liquefied Petroleum Gases) cooker for one typical year in Fortaleza-Brazil; Simulacao numerica da performance e estudo da viabilidade economica de tres tipos de fogoes: solar, hibrido (solar e gas natural) e a GLP (Gas Liquefeito do Petroleo) para um ano em Fortaleza

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Maria Eugenia Vieira da; Santana, Lana Ludmila Pinheiro [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Lab. de Energia Solar e Gas Natural (LESGN); Schwarzer, Klemens [Universidade de Ciencias Aplicadas de Aachen (Germany). Solar Institute Juelich; Miller, Francisco Mateus [PETROBRAS, Rio de Janeiro, RJ (Brazil); Baratelli Junior, Fernando [PETROBRAS, Rio de Janeiro, RJ (Brazil). Gerencia de Gas e Energia

    2004-07-01

    Alternative energy sources can represent viable economical solutions for the energy supply problems and also minimize damages to the environment. This research paper presents an economical and technical study of three different types of cookers: a solar cooker, a hybrid cooker and a conventional LPG cooker, through simulation for one typical year in Fortaleza. The solar cooker used in the experiments is composed of two pots, an oven, a tank of storage and 2m{sup 2} of solar collector area. The hybrid cooker has the same structure of the solar one with an additional natural gas burner, and the LPG stove can be easily found in the market. To find the value of the necessary energy to make food in a solar cooker, the amount of solar radiation was measured, as well as the sensible and latent efficiencies of the used stove. In the hybrid, it was considered that the natural gas is used only in the periods of the day when the amount of solar energy is not enough to heat the system up to the desired temperature. The results show an economical and technical comparison of the three different types of cookers. (author)

  4. Unbounded Naturalism

    Directory of Open Access Journals (Sweden)

    Andrew Taggart

    2008-10-01

    Full Text Available nbsp;font face="Times, serif"font size="3"In the Anglo-American reception of John McDowellrsquo;s /font/fontfont face="Times, serif"font size="3"emMind and World/em/font/fontfont face="Times, serif"font size="3", there has been little attention paid to the developmental aspect of his lsquo;partially re-enchantedrsquo; naturalism. In lsquo;Naturalism Unboundedrsquo;, I argue that McDowellrsquo;s story of our normal upbringing (/font/fontfont face="Times, serif"font size="3"emBildung/em/font/fontfont face="Times, serif"font size="3" presents problems for his claim that we have a lsquo;standing obligationrsquo; to reflect on our perceptual experiences. I follow this critique up with a Hegelian-inspired attempt to retain and revise the vital points he makes about experience./font/font

  5. Jagtens natur

    DEFF Research Database (Denmark)

    Gjerris, Mickey; Borkfelt, Sune; Gamborg, Christian

    2017-01-01

    Jagt kan ses som en konfrontation mellem menneskeverdenen og den vilde natur. I dag kan det dog være svært at få øje på det vilde i naturen i et land som Danmark, hvor over 60 % af det samlede areal anvendes til landbrug, og kun få pletter er overladt til sig selv. Ikke desto mindre spiller naturen...... en stor rolle for både jægerne og for de, der forholder sig kritisk til jagt. Der er stor enighed mellem disse parter om, at naturen er noget, vi skal tage vare på – men når det kommer til, hvilken natur der sigtes til, og hvordan vi skal tage vare på den, skilles vandene. Det skal bemærkes, at vi i...

  6. Oro para Colombia

    OpenAIRE

    Rubio Forero, María Claudia

    2016-01-01

    Las mujeres han debido atravesar un largo camino partiendo de la discriminación hasta empezar un proceso de equidad en la sociedad y en el deporte, de esta manera llegar a ser parte de un evento como los Juegos Olímpicos. Esta tesis toma el caso de tres atletas colombianas y describe su proceso de formación para lograr dos medallas de oro para el país.

  7. Development of prototype ovens working with natural gas, applied to ceramics, bread bake industry and incineration of the hospital garbage with the aid of virtual reality; Desenvolvimento de prototipos a gas natural de um incinerador de lixo hospitalar, forno de panificacao e forno para atividade ceramista com auxilio da realidade virtual

    Energy Technology Data Exchange (ETDEWEB)

    Mirapalheta, Felipe; Silva, Djalma R. da; Castro, Italo R. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil); Fabianski, Michel [RedeGasEnergia (Brazil)

    2004-07-01

    The Universidade Federal do Rio Grande do Norte has been developing prototype ovens, which work with natural gas. All the project of the prototypes, which will be applied to ceramic, bread bake industry and incineration of the hospital garbage, needs to be studied, developed and tested carefully until its conclusion. Then VRML language (Virtual Reality Modelling Language) is used as a tool in the study of the engineering projects and simulation of some tests. The main benefits of the use of this tool are: finding and solving problems in the project of the prototypes faster; optimization in the project since the three-dimensional visualization facilitates the study; and simulation of aspects of functioning of the ovens before its construction. (author)

  8. Natural games

    International Nuclear Information System (INIS)

    Anttila, Jani; Annila, Arto

    2011-01-01

    A course of a game is formulated as a physical process that will consume free energy in the least time. Accordingly, the rate of entropy increase is the payoff function that will subsume all forms of free energy that motivate diverse decisions. Also other concepts of game theory are related to their profound physical counterparts. When the physical portrayal of behavior is mathematically analyzed, the course of a game is found to be inherently unpredictable because each move affects motives in the future. Despite the non-holonomic character of the natural process, the objective of consuming free energy in the least time will direct an extensive-form game toward a Lyapunov-stable point that satisfies the minimax theorem. -- Highlights: → Behavior in the context of game theory is described as a natural process. → The rate of entropy increase, derived from statistical physics of open systems, is identified as the payoff function. → Entropy as the payoff function also clarifies motives of collaboration and subjective nature of decision making. → Evolutionary equation of motion that accounts for the course of a game is inherently unpredictable.

  9. Comparação de kits ELISA® comerciais para anticorpos no soro e leite com um teste coproparasitológico em bovinos naturalmente infectados por Fasciola hepatica Comparison of comercial® ELISA kits for antibodies in serum and milk with a fecal test in cattle naturally infected with Fasciola hepatica

    Directory of Open Access Journals (Sweden)

    Cíntia das C. Bernardo

    2013-01-01

    Full Text Available A fasciolose é uma enfermidade causada por um trematoda que acomete o fígado principalmente de ruminantes domésticos, podendo parasitar o homem e seu diagnóstico é realizado rotineiramente por exames coproparasitológicos. O objetivo do presente estudo foi comparar kits comerciais de ELISA para anticorpos no soro e leite com um teste coproprarasitológico em bovinos naturalmente infectados por Fasciola hepatica. Foram coletadas amostras de fezes (92 sangue (92 e leite (43 de bovinos provenientes de propriedades de gado leiteiro do município de Jerônimo Monteiro, sul do Estado do Espírito Santo. As amostras de fezes coletadas foram processadas pela técnica de sedimentação fecal para ovos de F. hepatica, utilizada como padrão ouro para as análises. Amostras de sangue e de leite foram processadas segundo a orientação do fabricante dos respectivos Kits ELISA comerciais testados. Utilizou-se o c² de McNemar para comparação estatística e calcularam-se a sensibilidade e especificidade, valores preditivos e kappa. Os resultados obtidos mostraram que as frequências de positividade pelo uso dos kits ELISA comerciais de soro e de leite diferiram significativamente (pThe fascioliasis is a disease caused by a trematode that affects the liver mainly of domestic ruminants and can also parasite man; its diagnosis is routinely done by coprological methods. The aim of this study was to compare commercial ELISA kits for antibodies in serum and milk with a coprological test in cattle naturally infected by Fasciola hepatica. We collected fecal, blood and milk samples from cattle in the municipality of Jerônimo Monteiro, southern Espírito Santo state. The fecal samples were processed by the fecal egg sedimentation for F. hepatica, which is used as a gold standard for analyzis. Blood (92 and milk (43 samples were processed according to the manufacturer instructions of the respective commercial ELISA kits tested. We used the McNemar chi-square for

  10. Estrategias para negociaciones exitosas.

    Directory of Open Access Journals (Sweden)

    José B. Parra V

    2010-01-01

    Full Text Available Las estrategias de negociación son herramientas para disminuir conflictos o para intercambiar bienes y servicios. Una negociación exitosa crea relaciones de solidaridad y propicia reciprocidad, cooperación y confianza para quienes tendrán relaciones permanentes de negociación con beneficios para ambas partes. Una estrategia de negociación exitosa requiere manejar el desarrollo del ambiente social del grupo de personas, con la finalidad de tener presente las fronteras que no pueden irrumpirse. Otro aspecto importante, es el lenguaje corporal utilizado por las personas y las tácticas que se practican. El manejo de esta información permite diseñar diferentes modelos de negociaciones para cada caso específico. Este documento propone la utilización de la herramienta MONACO, diseñada por los autores, que es un software útil para encontrar los mejores tácticas posibles dentro de una negociación; basándose en el lenguaje corporal que muestra el negociante oponente durante cada oferta monetaria. El uso de este software da al negociador la oportunidad de manejar las negociaciones con mayor control, el negociador que usa el software puede elegir una estrategia de acuerdo a las relaciones que espera mantener con el negociador oponente.

  11. Evaluation of water quality parameters for monitoring natural, urban, and agricultural areas in the Brazilian Cerrado Avaliação de parâmetros de qualidade de água para monitoramento de áreas naturais, urbanas e agrícolas no Cerrado brasileiro

    Directory of Open Access Journals (Sweden)

    Daphne Heloisa de Freitas Muniz

    2011-09-01

    Estação de Tratamento de Esgoto e três no Alto Rio Jardim (região com forte atividade agrícola. MÉTODOS: Análises de temperatura, pH, oxigênio dissolvido (OD, condutividade, turbidez, dureza total, principais íons, coliformes totais e fecais (E. coli da água, foram realizadas mensalmente durante doze meses envolvendo períodos seco e chuvoso. Além disso, também foi realizada avaliação ecotoxicológica utilizando o microcrustáceo Ceriodaphnia dubia. RESULTADOS: Os dados físico-químicos mostraram que OD, condutividade, Cl-, NO3-, SO4(2- e Na+ foram importantes para indicar a contaminação por efluentes urbanos. Quanto aos parâmetros biológicos, E. coli e avaliação ecotoxicológica, observou-se que o primeiro foi mais efetivo para avaliar qualidade da água na área urbana, enquanto que na área rural, o ensaio com C. dubia mostrou-se mais sensível, mas não ideal, tendo em vista a alta sensibilidade do organismo à baixa dureza da água. CONCLUSÕES: A presença de coliformes fecais (E. coli foi o indicador mais efetivo para comparar a qualidade da água entre as duas bacias, principalmente na urbanizada, enquanto que os ensaios de ecotoxicidade com C. dubia foram prejudicados pela composição química natural da água.

  12. The challenges of the implementation of regulation AGERBA for residential natural gas distribution in the state of Bahia, Brazil; Os desafios da implantacao do regulamento AGERBA (Agencia Estadual de Regulacao de Servicos Publicos de Energia, Transportes e Comunicacoes da Bahia) para o gas natural residencial no estado da Bahia

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Eduardo F. de [Bahiagas, Salvador, BA (Brazil)

    2008-07-01

    In recent years, important structural and institutional transformations are observed, for consequence the questions on the energy industries had started to incorporate, the regulation problems. Thus, the simple creation of new regulating agencies does not assure the automatic fulfilment of the functions of public interest. In this new context, these tasks are much more complex, demanding a learning process: how much to the structures of market and how much to the strategical behavior of the companies. In the local scene, to consolidate the distribution of the natural gas for the residential segment is one of the challenges of the Bahiagas, mainly after the publication of the Resolution that will go to establish the General Conditions of Gas Supply Canalized in the Residential Classroom in the State of the Bahia (hearing publishes carried through N. 002/2006 in June/2006). In this context, it is important to deeply understand the Resolution, that consequently will go to print a new dynamics for the Bahiagas. (author)

  13. Financial methodology for Brazilian market of small producers of oil and natural gas, based on Canadian and North American experiences in reserves quantification, evaluation and certification; Metodologia de financeiamento para pequenos produtores do mercado brasileiro de petroleo e gas natural, baseado nas experiencias canadense e americana na quantificacao, valoracao e certificacao de reservas

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Enrico Brunno Zipoli de Sousa e [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Programa de Pos-Graduacao em Geologia; Coelho, Jose Mario [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Dept. de Minas

    2008-07-01

    ANP (National Agency of Petroleum, Natural gas and Biofuels), through auctions of exploratory blocks in the subsequent years from the break of the monopoly of PETROBRAS with the Law 9.478 of 1997, had important role in the opening of the section and in the attainment of the self-sufficiency of petroleum. However the petroleum production in ripe and marginal fields were left off, since the initial interest in the first rounds was to attract the major companies. - International Oil Companies (IOC) - when ANP granted great blocks offshore. Ripe fields are defined as fields in phase of irreversible declination and marginal fields are also defined as economical concept, certain for business decision and external economical factors (price of the oil, etc.). Canada and USA, worldwide leaders in the market of petroleum and gas, possess politics that benefit and maintain the small companies protected of the competition of INOC's by assuring small companies finance through the guarantee of proved reserves of oil. This paper assemble Canadian and American experiences in regulation for small companies investments and compares it with Brazilian financing types, which is restricted due to the Brazilian finance agent's despite about oil and gas activity. (author)

  14. The use of a numerical simulation for the evaluation and optimization of a industrial equipment operation using a natural gas combustion; O uso da simulacao numerica para avaliar e otimizar a operacao de equipamentos industriais envolvendo a combustao de gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Marcos Sebastiao de P.; Nieckele, Angela O.; Naccache, Monica F. [Pontificia Univ. Catolica do Rio de Janeiro (PUC-Rio), RJ (Brazil). Dept. de Engenharia Mecanica; Nascimento Filho, Lenart Palmeira do [PETROBRAS, Rio de Janeiro, RJ (Brazil). Gerencia de Tecnologia do Gas Natural

    2004-07-01

    Numerical modeling may be used with great efficiency for predicting the behavior of systems operating in new situations. By using adequate models, it is possible to predict the performance of a system in a great number of different situations, in a fast manner and saving resources. The objective of the work was to develop a methodology, by using numerical modeling, with the purpose of predicting the behavior of combustion equipment operating with natural gas. The simulations included the modeling of the turbulent flow, the heat transfer and mass transfer problems, and also for considering the chemical reactions mechanisms. The investigation focused on the industrial segment. Two typical geometries were studied, represented by Industrial furnace for melting and re-melting metals, and Industrial furnace for ceramics ('tunnel' type). The simulations produced results, for the two geometries which were considered, on the velocity and temperature fields and species concentrations, within both furnaces. The developed methodology may be employed in other applications of practical interest. (author)

  15. Equações de volume de povoamento para fragmentos florestais naturais do município de Viçosa, Minas Gerais Stand volume equations for natural forest fragments in the municipality of Viçosa, Minas Gerais

    Directory of Open Access Journals (Sweden)

    Márcio Leles Romarco de Oliveira

    2005-04-01

    Full Text Available Este trabalho teve por objetivos desenvolver equações de volume de povoamento em fragmentos florestais naturais no município de Viçosa, Minas Geras, utilizando-se a amostragem por pontos (Método de Bitterlich; caracterizar as famílias e as espécies arbóreas que ocorrem na região, fundamentadas em trabalhos científicos; e caracterizar os fragmentos florestais do município, quanto a tamanho, forma e parâmetros quantitativos. Para isso, foram amostrados 55 pontos, através da amostragem por pontos (Bitterlich, com um fator de área basal K=1. Após as análises, verificou-se que o município de Viçosa possui 480 espécies arbóreas, pertencentes a 189 gêneros e 62 famílias; e 289 fragmentos florestais recobrindo 22,77% de área, equivalentes a 6.832,58 ha. O modelo, cujos volumes por hectare e as variáveis independentes área basal por hectare e altura do povoamento (altura total média e altura média dos fustes estavam linearizados, foi selecionado como o melhor para estimar o volume total com casca por hectare e o volume de fuste com casca por hectare.Stand volume equation for natural forest fragments in the municipality of Viçosa, Minas Gerais, were developed with the point sampling (Bitterlich's method. Moreover, the tree families and species found in the region were identified, and forest fragments characterized according to size, shape, and quantitative parameters. For that, 55 points were sampled according to the point sampling method (Bitterlich, with a basal area factor K= 1. Results of the analyses evidenced 480 tree species in the municipality of Viçosa, distributed in 189 genera and 62 families. The municipality has 289 forest fragments which cover 22,77% of its area (6.832,58 ha. The model whose volumes per hectare, dependent basal area variables per hectare and height of the stand (mean total height and mean height of stems had been linearized, was selected as the best model to estimate the total volume per hectare

  16. A importância de Reservas Particulares do Patrimônio Natural para a conservação da brioflora da Mata Atlântica: um estudo em El Nagual, Magé, RJ, Brasil The importance of Private Natural Heritage Reserves for conservation of Atlantic rain forest bryoflora: a study at El Nagual, Magé, Rio de Janeiro State, Brazil

    Directory of Open Access Journals (Sweden)

    Nivea Dias dos Santos

    2008-06-01

    Full Text Available Foi realizado o levantamento das briófitas da RPPN El Nagual, uma área de floresta submontana no Estado do Rio de Janeiro. Foram registradas 137 espécies (um antócero, 70 hepáticas e 66 musgos e duas variedades, distribuídas em 75 gêneros e 37 famílias, sendo cinco novas ocorrências para o estado. Lejeuneaceae (27 spp., Pilotrichaceae (17 spp., Aneuraceae (9 spp. e Calymperaceae (8 spp. destacam-se pela riqueza de espécies (44% da brioflora. Sete formas de vida foram caracterizadas, predominando trama (37%, tufo (16% e talosa (15%. Seis tipos de substrato são colonizados na área, predominando espécies corticícolas (52% e rupícolas (42%. Em relação aos padrões de distribuição, predominaram espécies neotropicais e pantropicais. Foram encontradas quatro espécies caracterizadas como vulneráveis no estado. Os resultados demonstram que a brioflora da RPPN é rica e evidenciam a importância dessa categoria de unidade de conservação na proteção de remanescentes de Mata Atlântica e conservação da brioflora.A floristic survey of the bryophytes was carried out in the El Nagual Private Natural Heritage Reserve, a submontane Atlantic rain forest remnant in Rio de Janeiro state. One hundred and thirty seven species were recorded (one Anthocerotae, 70 hepatics and 66 mosses plus two varieties, in 75 genera and 37 families. Five species are new records for Rio de Janeiro state. Lejeuneaceae (27 spp., Pilotrichaceae (17 spp., Aneuraceae (9 spp., and Calymperaceae (8 spp. are especially rich in species (44% of the bryoflora. Seven life-forms were found; the most common are weft (37%, turf (16%, and thallose (15%. Six kinds of substrate were colonized, the most important species types being corticicolous (52% and rupicolous (42%. The most common distribution patterns were Neotropical and Pantropical. Four species were considered to be vulnerable in the state. The results show that the bryoflora of the El Nagual Reserve is relatively

  17. Tiempo para un cambio

    Science.gov (United States)

    Woltjer, L.

    1987-06-01

    En la reunion celebrada en diciembre dei ano pasado informe al Consejo de mi deseo de terminar mi contrato como Director General de la ESO una vez que fuera aprobado el proyecto dei VLT, que se espera sucedera hacia fines de este aAo. Cuando fue renovada mi designacion hace tres aAos, el Consejo conocia mi intencion de no completar los cinco aAos dei contrato debido a mi deseo de disponer de mas tiempo para otras actividades. Ahora, una vez terminada la fase preparatoria para el VLT, Y habiendose presentado el proyecto formalmente al Consejo el dia 31 de marzo, y esperando su muy probable aprobacion antes dei termino de este ano, me parece que el 10 de enero de 1988 presenta una excelente fecha para que se produzca un cambio en la administracion de la ESO.

  18. Natural relaxation

    Science.gov (United States)

    Marzola, Luca; Raidal, Martti

    2016-11-01

    Motivated by natural inflation, we propose a relaxation mechanism consistent with inflationary cosmology that explains the hierarchy between the electroweak scale and Planck scale. This scenario is based on a selection mechanism that identifies the low-scale dynamics as the one that is screened from UV physics. The scenario also predicts the near-criticality and metastability of the Standard Model (SM) vacuum state, explaining the Higgs boson mass observed at the Large Hadron Collider (LHC). Once Majorana right-handed neutrinos are introduced to provide a viable reheating channel, our framework yields a corresponding mass scale that allows for the seesaw mechanism as well as for standard thermal leptogenesis. We argue that considering singlet scalar dark matter extensions of the proposed scenario could solve the vacuum stability problem and discuss how the cosmological constant problem is possibly addressed.

  19. Natural uranium

    International Nuclear Information System (INIS)

    Ammerich, Marc; Frot, Patricia; Gambini, Denis-Jean; Gauron, Christine; Moureaux, Patrick; Herbelet, Gilbert; Lahaye, Thierry; Pihet, Pascal; Rannou, Alain

    2014-08-01

    This sheet belongs to a collection which relates to the use of radionuclides essentially in unsealed sources. Its goal is to gather on a single document the most relevant information as well as the best prevention practices to be implemented. These sheets are made for the persons in charge of radiation protection: users, radioprotection-skill persons, labor physicians. Each sheet treats of: 1 - the radio-physical and biological properties; 2 - the main uses; 3 - the dosimetric parameters; 4 - the measurement; 5 - the protection means; 6 - the areas delimitation and monitoring; 7 - the personnel classification, training and monitoring; 8 - the effluents and wastes; 9 - the authorization and declaration administrative procedures; 10 - the transport; and 11 - the right conduct to adopt in case of incident or accident. This sheet deals specifically with natural uranium

  20. Natural isotopes

    International Nuclear Information System (INIS)

    Vogel, J.C.

    1986-01-01

    14 C dates between 600 and 900 AD were obtained for early Iron Age sites in Natal, and from 1300 to 1450 AD for rock engraving sites in Bushmanland. Palaeoenvironmental data derived from the dating of samples related to sedimentary and geomorphic features in the central and northern Namib Desert enabled the production of a tentative graph for the changes in humidity in the region over the past 40000 years. These results suggest that relatively humid conditions came to an end in the Namib at ±25000 BP (before present). The increased precision of the SIRA mass spectrometer enabled the remeasurement of 13 C and 18 O in the Cango stalagmite. This data confirmed that the environmental temperatures in the Southern Cape remained constant to within ±1 o C during the past 5500 years. Techniques and applications for environmental isotopes in hydrology were developed to determine the origin and movement of ground water. Isotopic fractionation effects in light elements in nature were investigated. The 15 N/ 14 N ratio in bones of animals and humans increases in proportion to the aridity of the environment. This suggests that 15 N in bone from dated archaeological sites could be used to detect changes in past climatic conditions as naturally formed nitrate minerals are higly soluble and are only preserved in special, very dry environments. The sources and sinks of CO 2 on the South African subcontinent were also determined. The 13 C/ 12 C ratios of air CO 2 obtained suggest that the vegetation provides the major proportion of respired CO 2 . 9 refs., 1 fig

  1. Utilização de cama sobreposta de suínos e sobressemeadura de leguminosas para aumento da produção e qualidade de pastagem natural Swine deep bedding amendment and legume sod-seeding to increase production and quality of natural pasture

    Directory of Open Access Journals (Sweden)

    Paulo Hentz

    2008-09-01

    Full Text Available Este trabalho foi conduzido com o objetivo de verificar o efeito da fertilização com dois tipos de camas sobrepostas de suínos (CSS, à base de casca de arroz (CA e maravalha (MA, sobre a produção de uma pastagem natural, com predomínio de Axonopus sp. e Paspalum sp., sobressemeada com leguminosas (cornichão e trevo-branco. As camas sobrepostas foram aplicadas em quantidades equivalentes a 180, 360, 540 e 720 kg/ha de P2O5, constituindo quatro níveis de cama de casca de arroz (30, 60, 90 ou 120 t/ha e quatro níveis de cama de maravalha (20,6; 41,2; 62,2 ou 82,8 t/ha. Foram incluídos dois tratamentos-testemunha: 180 kg/ha de superfosfato triplo (SFT e ausência de adubação (AA. A sobressemeadura das leguminosas foi realizada em maio de 2004 e, a partir de agosto de 2004, foram realizados nove cortes da pastagem, a cada seis semanas. As maiores produções de matéria seca (MS anuais (setembro/2004 a agosto/2005 com as aplicações de cama de casca de arroz foram obtidas nos níveis 30 e 60 t/ha e, com cama de maravalha, nos níveis 62,2 e 82,8 t/ha, que resultaram em produções de MS de 8.083 e 8.276 kg/ha, superiores às obtidas com superfosfato triplo (4.091 kg MS/ha e sem adubação (3.071 MS kg/ha. A produção de MS de trevo-branco aumentou linearmente no outono e no inverno, de acordo com os níveis de adubação com cama de maravalha, mas não variaram com a adubação com cama de casca de arroz. O efeito fertilizante varia entre os tipos de cama sobreposta, que podem influenciar a composição botânica de pastagens mistas de leguminosas-gramíneas.This work aimed to evaluate the effect of two swine deep beddings (SDB: rice husk (CA and sawdust coarse (MA on the production of natural pasture. The predominant species in this pasture were Axonopus sp. and Paspalum sp. that was sod-seeded with the forage legumes birdsfoot trefoil and white clover. The SDBs were applied in amounts equivalent to 180, 360, 540, and 720 kg/ha of P2O

  2. Instrucciones para autores

    OpenAIRE

    Martinez, Ana

    2012-01-01

    Instrucciones para autoresNota preliminar: ¡Es de suma importancia que antesde enviar cualquier documento a la Revista GeologíaColombiana, lea y cumpla cuidadosamente cada uno delos subíndices de las Normas para autores!A partir del Volumen 35 (2010) recibimos artículosprincipalmente a través del sistema digital enhttp://www.revistas.unal.edu.co/index.php/geocol/index.Si quiere enviar un artículo, por favor regístrese comoAutor en el menú INGRESAR (aquí pueden registrarsetambién evaluadores u...

  3. Master Plan para UNIMAK

    OpenAIRE

    Llorente Moreno, Francisco; Navarrete Mancebo, Gonzalo; Cruz Pinilla, Javier de la; García Méndez, María; Lacastagneratte de Figueiredo, Laura

    2012-01-01

    El Master Plan de UNIMAK se presenta como una apuesta a futuro, no solo para la Universidad de Makeni, sino también para la propia ciudad de Makeni. Se pretende potencias la Universidad como una referencia a nivel regional y como desencadenante de la estructura de trazado de la ciudad. El proyecto plantea potencial la dualidad que existe entre la infraestructura viaria y la red verde , existente en la ciudad, introduciéndola en el nuevo desarrollo del campus universitario y dotándola de la i...

  4. natural or artificial diets

    Directory of Open Access Journals (Sweden)

    A. O. Meyer-Willerer

    2005-01-01

    Full Text Available Se probaron alimentos artificiales y naturales con larva de camarón (Litopenaeus vannamei cultivados en diferentes recipientes. Estos fueron ocho frascos cónicos con 15L, ocho acuarios con 50L y como grupo control, seis tanques de fibra de vidrio con 1500L; todos con agua marina fresca y filtrada. La densidad inicial en todos los recipientes fue de 70 nauplios/L. Aquellos en frascos y acuarios recibieron ya sea dieta natural o artificial. El grupo control fue cultivado con dieta natural en los tanques grandes que utilizan los laboratorios para la producción masiva de postlarvas. El principal producto de excreción de larva de camarón es el ión amonio, que es tóxico cuando está presente en concentraciones elevadas. Se determinó diariamente con el método colorimétrico del indofenol. Los resultados muestran diferencias en la concentración del ión amonio y en la sobrevivencia de larvas entre las diferentes dietas y también entre los diferentes recipientes. En aquellos con volúmenes pequeños comparados con los grandes, se presentó mayor concentración de amonio (500 a 750µg/L, en aquellos con dietas naturales, debido a que este ión sirve de fertilizante a las algas adicionadas, necesitando efectuar recambios diarios de agua posteriores al noveno día de cultivo para mantener este ión a una concentración subletal. Se obtuvo una baja cosecha de postlarvas (menor a 15% con el alimento artificial larvario, debido a la presencia de protozoarios, alimentándose con el producto comercial precipitado en el fondo de los frascos o acuarios. Los acuarios con larvas alimentadas con dieta natural también mostraron concentraciones subletales de amonio al noveno día; sin embargo, la sobrevivencia fue cuatro veces mayor que con dietas artificiales. Los tanques control con dietas naturales presentaron tasas de sobrevivencia (70 ± 5% similares a la reportada por otros laboratorios.

  5. Conceptos Basicos Sobre el Gas Natural

    Energy Technology Data Exchange (ETDEWEB)

    2016-08-01

    El gas natural abastece cerca de 150.000 vehiculos en los Estados Unidos y aproximadamente 22 millones de vehiculos en todo el mundo. Los vehiculos de gas natural (NGV, por sus siglas en ingles) son una buena opcion para las flotas de vehiculos de alto kilometraje, tales como autobuses, taxis, vehiculos de recoleccion de basura, los cuales son alimentados centralmente u operan dentro de un area limitada o a lo largo de una ruta con estaciones de servicio de gas natural. Las ventajas del gas natural como combustible alternativo incluyen su disponibilidad interna, la red de distribucion establecida, un costo relativamente bajo, y los beneficios de las emisiones.

  6. alternativas para promoverla

    Directory of Open Access Journals (Sweden)

    Carlos Muñoz Izquierdo

    2006-01-01

    Finalmente, se analizan las políticas que han sido aplicadas con el fin de combatir ese problema, y se sugieren algunos cursos de acción que se consideran potencialmente más eficaces para lograr ese propósito.

  7. Silo para cereales. Bandholm

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1960-09-01

    Full Text Available El silo de Bandholm, para cereales, construido en la isla de Lolland, tiene una capacidad de 13 a 14.000 toneladas. Esta estructura se ha subdividido en células individuales de unas 400 toneladas de capacidad cada una. La obra ha sido proyectada y construida por Christiani & Nielsen.

  8. Instrucciones para autores y autoras

    OpenAIRE

    Casa de la Mujer, Revista

    2015-01-01

    Le recomendamos leer este documento a profundidad para queconozca las políticas y normas para postular a consideración su escrito.Estas instrucciones se organizan en tres apartados: I. Datos básicos,II. Políticas y III. Lineamientos para presentar el escrito; para la citacióny referenciación con APA se ofrece el documento titulado Guía dereferenciación y citación con APA.

  9. Nature and nature values in organic agriculture

    DEFF Research Database (Denmark)

    Hansen, Lene; Noe, Egon; Højring, Katrine

    2006-01-01

    The relationship between agriculture and nature is a centra issue in the current agricultural debate. Organic farming has ambitions and a special potential in relation to nature. Consideration for nature is part of the guiding principals of organic farming and many organic farmers are committed...... to protecting natural qualities. However, the issue of nature, landscape, and land use is not straightforward. Nature is an ambiguous concept that involves multiple interests and actors reaching far beyond farmers. The Danish research project ......

  10. ParaChoice Model.

    Energy Technology Data Exchange (ETDEWEB)

    Heimer, Brandon Walter [Sandia National Lab. (SNL-CA), Livermore, CA (United States); Levinson, Rebecca Sobel [Sandia National Lab. (SNL-CA), Livermore, CA (United States); West, Todd H. [Sandia National Lab. (SNL-CA), Livermore, CA (United States)

    2017-12-01

    Analysis with the ParaChoice model addresses three barriers from the VTO Multi-Year Program Plan: availability of alternative fuels and electric charging station infrastructure, availability of AFVs and electric drive vehicles, and consumer reluctance to purchase new technologies. In this fiscal year, we first examined the relationship between the availability of alternative fuels and station infrastructure. Specifically, we studied how electric vehicle charging infrastructure affects the ability of EVs to compete with vehicles that rely on mature, conventional petroleum-based fuels. Second, we studied how the availability of less costly AFVs promotes their representation in the LDV fleet. Third, we used ParaChoice trade space analyses to help inform which consumers are reluctant to purchase new technologies. Last, we began analysis of impacts of alternative energy technologies on Class 8 trucks to isolate those that may most efficaciously advance HDV efficiency and petroleum use reduction goals.

  11. Resina pet para recipientes

    OpenAIRE

    Montenegro, Ricardo Sá Peixoto; Monteiro Filha, Dulce Corrêa; Pan, Simon Shi Koo

    1996-01-01

    O mercado potencial de resina PET para recipientes é grande, com ampla expectativa de expansão. A nível mundial, esta ocorrendo um ciclo de expansão que deverá levar a uma sobrecapacidade, pressionando os preços para baixo. No Brasil, a escassez de resina PET tem retardado sua maior utilização em recipientes, notadamente de bebidas carbonatadas e em mercados em desenvolvimento, como o de óleo comestível e água mineral. Com a entrada em operação da fábrica da Nitrocarbono e da expansão da Rhod...

  12. Educando para la ignorancia

    Directory of Open Access Journals (Sweden)

    Miguel Durán

    1996-06-01

    Full Text Available Más que describir una situación particular, los autores buscan con este escrito motivar al estudiante para que asuma posiciones críticas; así como dar un campanazo de alerta a los profesores, en relación a los conocimientos que transmiten a sus alumnos y la forma en que lo hacen; todo con el ánimo de generar verdaderos espacios de reflexión en la universidad.

  13. INICIATIVAS PARA EL CAMBIO

    Directory of Open Access Journals (Sweden)

    César Alfonso Defrancisco-Larrañaga

    2013-07-01

    Full Text Available El planeta no atraviesa por su mejor momento en materia de conservación y renovación de sus recursos naturales. Claramente en los últimos tiempos los recursos hídricos han venido haciéndose cada vez menores; el hombre ha notado con preocupación y vivido en carne propia este fenómeno, que de no ser tratado a tiempo, podría atentar contra la existencia misma. Esto lo ha alentado a buscar métodos que sirvan como solución para contrarrestar éste mal y crear conciencia entre sus iguales, para así poder garantizar su permanencia y la de su entorno durante muchas generaciones. En países desarrollados del continente europeo y en algunos lugares de América del norte, el uso de sistemas de reutilización y tratamiento de aguas grises y aprovechamiento de las aguas lluvias se ha convertido en una constante y nos están dando las pautas para poder seguir el ejemplo y así de esta manera poder aportar a la causa ambiental y a su vez crear un ahorro en nuestros gastos mensuales de consumo.

  14. Bullying: Conhecer para Prevenir

    Directory of Open Access Journals (Sweden)

    Elisabete Fernandes

    2016-01-01

    Full Text Available O bullying é um fenómeno que suscita a apreensão de toda a sociedade. Deste modo, enquanto pais, educadores e profissionais, devemos reconhecer que a violência entre pares em meio escolar afeta gravemente o desenvolvimento saudável das crianças. Conhecer e identificar as causas que estão na origem do bullying, bem como as consequências que este comportamento acarreta no desenvolvimento psicossocial dos seus alvos, é fundamental para melhor intervir. Proteger as crianças e jovens de hoje contribui para potenciar um futuro sem violência, através da existência de adultos equilibrados. Assim, a criação e implementação de estratégias de prevenção do bullying em contexto escolar constitui-se como dever social, porquanto só através de diversificadas conjugações de esforços será possível contribuir para um amanhã mais seguro.

  15. Desarrollo de un algoritmo computacional para la estimación de la tensión de cables en puentes atirantados con base en la medición experimental en laboratorio y campo de sus modos y frecuencias naturales de vibración Development of an computational algorith for estimating cables'tensile stress on cable-stayed bridges based on experimental laboratory and job site measurements on their natural vibration modes and frequencies

    Directory of Open Access Journals (Sweden)

    Giordano Avellaneda

    2012-12-01

    Full Text Available En la presente investigación, se propone una nueva metodología para estimar la tensión de los tirantes con base en sus modos y frecuencias naturales de vibración, mediante el desarrollo de un aplicativo computacional apoyado en el método de los elementos finitos (FEM y en el análisis detallado de las señales. Para ello se presenta en este documento un estado del arte con algunos de los trabajos desarrollados en el mundo, un marco conceptual y la metodología planteada para su desarrollo y ejecución. El aplicativo computacional fue generado en MATLAB® y validado a través de mediciones experimentales en un prototipo a escala y en algunos cables de un puente atirantado en Colombia cuando estaba en proceso de construcción, con el cual se permite estimar la magnitud de la tensión de los tirantes con errores mínimos.In the present research, is proposed a new methodology for estimating tension forces in cables on the basis of their modes and natural frequencies of vibration, by developing a computer application leaning on the finite element method (FEM and a detailed analysis of signals. In this paper is presented a state of the art with some of the work done around the world, a conceptual framework and a proposed methodology for its development and implementation. The computer application which was programmed in MATLAB ®, which was validated through experimental measurements on a scaled prototype and some cables of a cable stayed bridge under construction in Colombia, allows to estimate the magnitude of the cable's tension with minimal errors.

  16. Trabalhar para estudar/estudar para trabalhar: realidade e possibilidades

    Directory of Open Access Journals (Sweden)

    Janes Teresinha fraga Siqueira

    2011-01-01

    Full Text Available O trabalho que apresentamos é parte da pesquisa, ainda não concluída, com os estudantes das licenciaturas e da pedagogia da Universidade de Santa Cruz do Sul- UNISC-RS-Brasil. Este está inserido na linha de pesquisa: educação, trabalho e emancipação do mestrado em educação desta Universidade. Queremos compreender, à luz do materialismo histórico e dialético e das categorias da crítica da economia política, os significados atribuídos pelos estudantes universitários ao fenômeno trabalho e estudo. É uma pesquisa preferentemente qualitativa de natureza dialética. Para Marx, a essência da realidade humana reside no trabalho, mas a fonte de toda a riqueza está na natureza. Logo trabalho, natureza e sociedade estão em relação dialética. Trabalho, portanto, é a ideia central articuladora, e natureza e sociedade devem ser estudadas em conexão com o trabalho. Marx trata o trabalho, no modo de produção capitalista, como um impedimento ao desenvolvimento humano. Propõe omesmo como um ato de criação e auto-expressão humana que não deve ter um valor. A compreensão dessa premissa é necessária para que os trabalhadores possam significar e ressignificar o trabalho para além da ideologia dominante. Algumas categorias aparecem como relevantes para a análise: condições de trabalho e de estudo, necessidade de formação, predominância do trabalho sobre o estudo, dificuldade deconciliar tempo de estudo e de trabalho. Na relação com o objeto de estudo, ressaltaremos a crise estrutural do capital, a desregulamentação das leis do trabalho e sua flexibilização e as contradições entre trabalho e estudo bem como quais possibilidades emancipatórias são visualizadas ou sonhadas pelos trabalhadores estudantes.Resume Ce travail constitue une partie de la recherche entreprise avec les étudiants du cours de pédagogie de l´Universidade de Santa Cruz do Sul – UNISC – RS – Brésil. Il est intégré dans le champ de

  17. La tasa natural de desempleo en Colombia y sus determinantes

    OpenAIRE

    Jorge Andrés Tamayo

    2008-01-01

    En este trabajo se estima una tasa natural de desempleo para Colombia en el período 1984-2006. Siguiendo el modelo de negociación de salarios de Blanchard (1991), se emplea un filtro de Kalman, para estimar un sistema de ecuaciones para la tasa natural de desempleo, el desajuste del mercado laboral, los salarios y los precios según la metodología propuesta por Salemi (1999). Los resultados de este ejercicio resaltan el papel de la participación joven en el mercado laboral y los costos laboral...

  18. Para-aminobenzoic acid

    Science.gov (United States)

    PABA is used in certain sunscreen and skin-care products. It may also naturally occur in these foods: Brewer's yeast Liver Molasses Mushrooms Spinach Whole grains Other products may also contain PABA.

  19. Nuevos elementos para el estudio de la cogeneración en Colombia

    OpenAIRE

    Agudelo Santamaría, John Ramiro; Amell Arrieta, Andrés Adolfo; Cadavid Sierra, Francisco Javier

    2002-01-01

    El programa de masificación de gas natural aporta un elemento nuevo de gran importancia para los proyectos de cogeneración de pequeña y mediana escala en la industria del interior del país. Las nuevas tecnologías de motores de combustión interna alternativos (MCIA) diseñados para operar con gas natural exclusivamente o para operación dual diesel-gas natural, ofrecen rendimientos globales más elevados que los motores convencionales, con ventajas ambientales significativas. Este artículo, ademá...

  20. para mejorar el %R

    Directory of Open Access Journals (Sweden)

    Alfredo Díaz Mata

    2001-01-01

    Full Text Available En este trabajo se revisan dos indicadores técnicos bursátiles que están estrechamente relacionados, el oscilador estocástico %K de Lane y el oscilador %R de Williams; asimismo, se evalúa el uso de dos mecanismos asociados con el primero y que no suelen utilizarse con el %R: el proceso de frenado (slowing y el uso de un promedio móvil del propio oscilador estocástico como disparadores de señales de compra y de venta. Realizando simulaciones con 27 acciones y el Índice de Precios y Cotizaciones de la Bolsa Mexicana de Valores se verifica la hipótesis principal y se comprueba que, efectivamente, en muchos casos, el uso del proceso de frenado con el oscilador %R de Williams permite tomar mejores decisiones. Por otro lado, se concluye que de los dos disparadores de señales el que mejor funciona, tanto para %K como para %R es el uso de cotas inferior y superior. Este artículo surgió en el curso de una investigación sobre el análisis técnico bursátil de acciones que se puede realizar en su totalidad por computadora y que, esencialmente, excluye el análisis gráfico. Uno de los propósitos del estudio es determinar si es posible, y bajo qué mecanismos, establecer un sistema de análisis bursátil que le permita al inversionista tomar decisiones de inversión en acciones en la Bolsa Mexicana de Valores sin tener que emplear la considerable cantidad de tiempo que es necesario para el análisis gráfico tradicional. Durante este estudio se realizó un análisis preliminar de unos 120 indicadores técnicos para, por un lado, conocerlos con cierto detalle y, por otra parte, aislar aquellos que prometían ser de utilidad para el objetivo de la investigación. Fue en este proceso cuando se detectó que existen dos indicadores que están relacionados y que permiten un análisis por separado que tiene, cuando menos, dos ventajas. En primer lugar está el placer que da a quien gusta de estos temas encontrarse con indicadores que, de acuerdo

  1. Inmunopotenciadores para la acuicultura

    Directory of Open Access Journals (Sweden)

    Rocmira Pérez

    2014-04-01

    Full Text Available La acuicultura es una de las actividades económicas de mayor crecimiento para la producción de alimentos. Uno de sus principales retos es la obtención de grandes volúmenes de producción con la mayor calidad posible. Esto conlleva a una reducción de la aplicación de antibióticos y productos quimioterapéuticos. Una de las estrategias más prometedoras es la aplicación de inmunopotenciadores, principalmente en los cultivos intensivos. El objetivo de este trabajo fue revisar los principales inmunopotenciadores, así como las tendencias y retos de su uso mundial. Se resumen las particularidades moleculares y funcionales de los mismos y se hace énfasis en los más estudiados: levamisol, ß-glucanos, lipopolisacárido, vitamina C, extractos de plantas y hormonas. Todos estos compuestos de naturaleza heterogénea inciden mayoritariamente en los componentes de la inmunidad innata de los peces, fortaleciendo y potenciando la resistencia a enfermedades; adicionalmente algunos de ellos tienen funciones antiestrés y favorecen su crecimiento. Se concluye que los inmunopotenciadores constituyen una estrategia viable para reducir las pérdidas por problemas sanitarios en el sector de la acuicultura; pero aún quedan por solucionar aspectos como la vía de administración y la etapa de inmunización adecuada para cada especie y tipo de cultivo.

  2. Democracia para ciudadanos ciborgs

    Directory of Open Access Journals (Sweden)

    Juan Varela

    2007-07-01

    Full Text Available Enumera los instrumentos imprescindibles de la ciberpolítica para campañas electorales en España, cuando se renovaron los cargos municipales. La política vuelve a ser personal cuando ciudadanos y políticos se hablan cara a cara y cita varios ejemplos, reconociendo la recuperación de la comunicación directa. La ciberdemocracia es muy exigente. Los políticos prefieren la magia de la imagen. La sociedad no sabe como detener la propaganda viral que bombardea a los buscadores de red.

  3. Para pensar o afeto

    Directory of Open Access Journals (Sweden)

    Aluisio Pereira de Menezes

    Full Text Available Apresentação de um conjunto de formulações relativas ao “afeto” anteriores ao surgimento da psicanálise. Dificuldade da psicanálise em construir uma concepção propriamente psicanalítica. Contribuição da fenomenologia de Husserl para o estudo do afeto. Atualidade das concepções do afeto marcadas pelas neurociências. As maneiras principais de ver o problema da conceituação do afeto no pensamento psicanalítico.

  4. Nombrados para el mal

    OpenAIRE

    Lara, Claudio; Sanchez, Mariela

    2011-01-01

    El presente trabajo se encuentra inscripto en la investigación Las vicisitudes del lazo amoroso en la época actual en el Gran La Plata. En ella, nuestro rasgo de investigación fue establecer algunas coordenadas para pensar que los signos de la Declinación del Nombre del Padre deben leerse en la transformación del registro del amor, dejando por fuera el registro que más desarrollos ha tenido dentro del campo del psicoanálisis: el de los ideales y el de la autoridad. La propuesta es que si El n...

  5. Bullying: Conhecer para Prevenir

    OpenAIRE

    Elisabete Fernandes; Sónia Henriques; Susana Mendes; Esperança Ribeiro

    2016-01-01

    O bullying é um fenómeno que suscita a apreensão de toda a sociedade. Deste modo, enquanto pais, educadores e profissionais, devemos reconhecer que a violência entre pares em meio escolar afeta gravemente o desenvolvimento saudável das crianças. Conhecer e identificar as causas que estão na origem do bullying, bem como as consequências que este comportamento acarreta no desenvolvimento psicossocial dos seus alvos, é fundamental para melhor intervir. Proteger as crianças e jovens de hoje contr...

  6. Paisajismo para La Reserva

    OpenAIRE

    Fernández,Teodoro

    2004-01-01

    El paisaje de Santiago está fuertemente determinado por el ejercicio de una voluntad. En un secano, con cuatro meses lluviosos y una sequía larga, los santiaguinos han construido a través de los años un jardín de riego soportado por múltiples dispositivos: acequias, canales, pozos y estanques. Es posible inaugurar para la ciudad otra manera de ejercer esa voluntad de paisaje: no una transformación impositiva, sino la comprensión de los procesos y relaciones naturales entre lluvia, torrentes, ...

  7. Cristalizadores para soro concentrado

    OpenAIRE

    TULER PERRONE, Italo; Simeão, Moise; Schuck, Pierre; Stephani, Rodrigo; De Carvahlo, Antonio Fernandes

    2016-01-01

    Na industria de secagem de lacteos observa-se que a secagem do soro é mais complicada do que a secagem do leite. São frequentes as adesões dentro do spray dryer, ciclones e tubulações, assim como o empedramento do produto durante o processamento ou durante a estocagem e o transporte. Ao buscarmos mecanismos para maior controle e padronização da tecnologia de produção do soro em pó nos deparamos com diversos requisitos de qualidade como: acidez e pH do soro, microbiota contaminante, teor de sa...

  8. "Colaborar para Competir"

    Directory of Open Access Journals (Sweden)

    Martha Liliana Hijuelos-Cárdenas

    2015-06-01

    Full Text Available De acuerdo con Michael Porter, los Clusters se definen como “Una agrupación de empresas e instituciones relacionadas entre sí, pertenecientes a un mismo sector o segmento de mercado, que se encuentran próximas geográficamente y que colaboran para ser más competitivas”. Los Clusters son en última instancia una herramienta de competitividad basada en la cooperación de sus miembros, y es una de las estrategias recientes, en el país, para incrementar la productividad y competitividad y las apuestas productivas desde el nivel local. Y es precisamente esta cercanía geográfica de las empresas de un mismo sector, lo que a la vez que genera la competencia entre ellas, también les facilita el acceso a insumos y a conocimientos específicos y en última instancia les permite promover la innovación.

  9. para las lenguas

    Directory of Open Access Journals (Sweden)

    Manuel Tost Planet

    2005-01-01

    Full Text Available La publicación del Marco común europeo de referencia para las lenguas, del Consejo de Europa –aún poco conocido en nuestro país– está teniendo ya una notable influencia en todos los ámbitos de la enseñanza de las lenguas y de un modo particular en la elaboración de materiales de nueva generación para el aprendizaje de las lenguas extranjeras. Tras presentar elementos contextuales de la situación del FLE en nuestro país, que tienen, pensamos, una cierta relevancia, en esta contribución se describen precisamente algunos aspectos fragmentarios de dicho Marco y se evocan, por último, los principales ejes en torno a los cuales se mueve la actual innovación didáctica, en lo que se refiere más concretamente a las actividades de aprendizaje en el aula de idiomas.

  10. Serie: Madera para construcción Acabados para madera

    OpenAIRE

    Sáenz-Muñoz, Marta

    2012-01-01

    Durante mucho tiempo, la madera ha sido utilizada como material de construcción para resolver principalmente objetivos estructurales; sin embargo, actualmente, el uso de la madera ha tomado mucho auge en la estética de las construcciones, para brindar apariencia y calidez. En la actualidad, el mercado ofrece una amplia gama productos para dar diversos “acabados” a la madera, los cuales sirven para resaltar la belleza de algunas de ellas, realzar características como el color y la veta, o bien...

  11. Simulación numérica de fenómenos de convección natural. Aplicación a un sistema solar termosifón para la obtención de agua caliente sanitaria

    OpenAIRE

    Mas de les Valls Ortiz, Elisabet

    2004-01-01

    En el presente proyecto se pretende adquirir un dominio suficiente de los métodos numéricos en la transferencia de calor y dinámica de fluidos computacional (CFD) y, con ello, realizar un estudio en profundidad de la fenomenología de un sistema solar termosifón para la obtención de agua caliente sanitaria. Esto implica el estudio y desarrollo de las ecuaciones gobernantes que rigen el sistema y de los métodos numéricos necesarios para su resolución, la implementación de un código ...

  12. Alternativa para el turismo de naturaleza. Caso de estudio. Soroa. Pinar del Río. Cuba

    Directory of Open Access Journals (Sweden)

    Gliceria Gómez Ceballos

    2009-01-01

    Se aplicaron diversos instrumentos para conocer las principales motivaciones de viaje de los turistas al lugar, así como se estudiaron, los principales elementos que sirven de base para caracterizar el mercado y las potencialidades existentes desde el punto de vista natural, histórico y cultural.

  13. Brasil: Ciencia para muchos

    OpenAIRE

    Manuel Carlos Chaparro

    2015-01-01

    La crisis económica obliga a reducir los espacios destinados al periodismo científico en los principales diarios de Brasil donde han sido despedidos muchos periodistas especializados. Existe un interés humano natural por los descubrimientos, avances científicos e inventos. El texto refiere formas de escribir este tipo de periodismo.

  14. Nature and nature values in organic agriculture

    DEFF Research Database (Denmark)

    Hansen, Lene; Noe, Egon; Højring, Katrine

    2006-01-01

    The relationship between agriculture and nature is a centra issue in the current agricultural debate. Organic farming has ambitions and a special potential in relation to nature. Consideration for nature is part of the guiding principals of organic farming and many organic farmers are committed t...

  15. Contratados peninsulares para Cuba

    Directory of Open Access Journals (Sweden)

    Iglesias García, Fe

    1994-12-01

    Full Text Available Not available.

    Ante las presiones británicas, la metrópoli española y los ideólogos de los hacendados cubanos tuvieron que dar, desde la tercera década del siglo XIX, una respuesta a la previsible escasez de mano de obra esclava. El artículo estudia los sistemas de contrata implantados en la isla para abastecer de mano de obra blanca y barata a Cuba, deteniéndose particularmente la autora en el estudio de las condiciones de semiesclavitud que se escondían en las mencionadas contratas y en el perfil de los inmigrantes (profesiones, sexo, edad, procedencia....

  16. Sustantivos para definir homofobia

    OpenAIRE

    Campo Árias, Adalberto; Herazo, Edwin; Oviedo, Heidi

    2013-01-01

    Introducción. El término ‘homofobia’ es un concepto que se introdujo en el contexto académico hace más de 40 años. Sin embargo, la acepción ha tenido reparos y cambios en el tiempo. Objetivo. Revisar los sustantivos usados en los últimos doce años para definir homofobia. Metodología. Se realizó una búsqueda sistemática en Medline a través de Pubmed de publicaciones tipo editorial, cartas al editor, comentarios y entrevista en español o inglés. Se realizó un análisis cualitativo (teoría fundam...

  17. Bases para proyectiles dirigidos

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1959-03-01

    Full Text Available Aunque actualmente no se ha llegado a una línea general de métodos o sistemas que gobiernen un tipo característico de rampa y servicios auxiliares necesarios para el lanzamiento al espacio de proyectiles dirigidos a grandes alturas y distancias, las experiencias obtenidas en diferentes ensayos, utilizando distintos tipos de proyectiles y trayectorias balísticas, han sentado toda una serie de procedimientos, datos y conclusiones de gran valor balístico que, aun teniendo en cuenta la continua evolución del proyectil, sus formas, combustibles y alcances, se conocen ya, con bastante aproximación, las condiciones mínimas que ha de reunir una base dedicada a este tipo de lanzamientos.

  18. Registrar para avanzar

    Directory of Open Access Journals (Sweden)

    Laia Matarranz Torres

    2017-06-01

    Full Text Available El farmacéutico comunitario es un profesional sanitario con un enorme potencial para mejorar no solo el uso de los medicamentos (detectando, por ejemplo, resultados negativos de la medicación, sino también la prevención de enfermedades y la promoción de la salud pública. Sin duda, el desarrollo y el impulso que están teniendo los servicios profesionales farmacéuticos (SPF desde hace años pueden contribuir decisivamente a que este potencial se consolide de una forma definitiva, obteniendo el reconocimiento del conjunto del sistema sanitario, incluyendo tanto a otros profesionales de la salud (médicos, enfermería, medicina especializada… como a la Administración y, por supuesto, a los propios pacientes beneficiarios de estos servicios. Es cierto que la figura del farmacéutico y su ejercicio sanitario han estado tradicionalmente bien considerados por la población, pero no es menos verdad que la integración de la actividad asistencial de la farmacia comunitaria en el Sistema Nacional de Salud (SNS es, cuanto menos mejorable, y que, incluso, algunas manifestaciones ponen en entredicho de vez en cuando la labor científico-asistencial de las farmacias o generan dudas sobre su capacidad para formar parte de pleno derecho de los equipos de salud que deben trabajar de forma coordinado en la mejora de la atención sanitaria de los pacientes.

  19. Lei natural e lei civil em Locke

    Directory of Open Access Journals (Sweden)

    Gustavo Hessmann Dalaqua

    2015-04-01

    Full Text Available Resumo: O artigo aborda a relação entre lei natural e lei civil na filosofia de John Locke. Embora leituras consagradas tenham afirmado que a relação entre ambas é dedutiva, este artigo tentará apresentar uma interpretação diferente, qual seja, a de que a relação entre lei civil e lei natural é de determinação. Longe de ser mera dedução de uma lei natural imutável, a lei civil possui papel determinante com relação à lei natural. Como mostraremos, esta interpretação realça algo que Locke tinha em alta estima: o caráter deliberativo da lei natural. A deliberação dos cidadãos na legislatura cria, em certa medida, a lei natural. Os cidadãos são livres para determinar a lei, e a participação em tal determinação é crucial para a manutenção de sua liberdade política. Nesse sentido, como veremos, a liberdade política lockiana é tributária do republicanismo.

  20. Exploring the use of natural antimicrobial agents and pulsed electric fields to control spoilage bacteria during a beer production process Exploración del uso de agentes antimicrobianos naturales y de campos eléctricos pulsantes para el control de bacterias contaminantes durante el proceso de elaboración de cerveza

    Directory of Open Access Journals (Sweden)

    M. A. Galvagno

    2007-09-01

    Full Text Available Different natural antimicrobials affected viability of bacterial contaminants isolated at critical steps during a beer production process. In the presence of 1 mg/ml chitosan and 0.3 mg/ml hops, the viability of Escherichia coli in an all malt barley extract wort could be reduced to 0.7 and 0.1% respectively after 2 hour- incubation at 4 °C. The addition of 0.0002 mg/ml nisin, 0.1 mg/ml chitosan or 0.3 mg/ml hops, selectively inhibited growth of Pediococcus sp. in more than 10,000 times with respect to brewing yeast in a mixed culture. In the presence of 0.1mg ml chitosan in beer, no viable cells of the thermoresistant strain Bacillus megaterium were detected. Nisin, chitosan and hops increased microbiological stability during storage of a local commercial beer inoculated with Lactobacillus plantarum or Pediococcus sp. isolated from wort. Pulsed Electric Field (PEF (8 kV/cm, 3 pulses application enhanced antibacterial activity of nisin and hops but not that of chitosan. The results herein obtained suggest that the use of these antimicrobial compounds in isolation or in combination with PEF would be effective to control bacterial contamination during beer production and storage.Diferentes antimicrobianos naturales disminuyeron la viabilidad de bacterias contaminantes aisladas en etapas críticas del proceso de producción de cerveza. En un extracto de malta, el agregado de 1 mg/ml de quitosano y de 0,3 mg ml de lúpulo permitió reducir la viabilidad de Escherichia coli a 0,7 y 0,1%, respectivamente, al cabo de 2 horas de incubación a 4 °C. El agregado de 0,0002 mg/ml de nisina, 0,1 mg/ml de quitosano o de 0,3 mg/ml de lúpulo inhibió selectivamente (10.000 veces más el crecimiento de Pediococcus sp. respecto de la levadura de cerveza en un cultivo mixto. El agregado de 0,1 mg/ml de quitosano permitió disminuir la viabilidad de una cepa bacteriana termorresistente, Bacillus megaterium, hasta niveles no detectables. Por otra parte, el

  1. Natural gas trends

    International Nuclear Information System (INIS)

    Anderson, A.

    1991-01-01

    This book provides data on many facets of the natural gas industry. Topics include: Canadian, Mexican; US natural gas reserves and production; Mexican and US natural gas consumption; market conditions for natural gas in the US; and Canadian natural gas exports

  2. The para-petroleum industry

    International Nuclear Information System (INIS)

    2002-07-01

    The para-petroleum industry includes societies that realize studies and installations for the deposits exploitation. This document presents the situation of the para-petroleum industry in 2001, the world investment growth of the activity, the french societies financial results and an inventory of the main operations in the amalgamation domain. (A.L.B.)

  3. para promover la salud

    Directory of Open Access Journals (Sweden)

    Ma. del Consuelo Chapela

    2002-01-01

    Full Text Available Hablar de educación a distancia sustentada en el desarrollo de la cibernética obliga a reflexionar sobre sus definiciones, objetivos y medios, especialmente si pensamos en las necesidades de la fracción de población que no tiene acceso a las posibilidades que ofrece el desarrollo tecnológico. En este trabajo se presenta e ilustra con un ejemplo práctico, una perspectiva sobre las posibilidades de la educación a distancia desde las necesidades de la promoción de la salud entre grupos de población marginada en el mundo virtual. Se propone la creación de bibliotecas itinerantes regionales que pongan a disposición de la población con acceso limitado a la información, la tecnología comunicativa necesaria para apoyar los trabajos de promoción de la salud.

  4. Natural Colorants: Food Colorants from Natural Sources.

    Science.gov (United States)

    Sigurdson, Gregory T; Tang, Peipei; Giusti, M Mónica

    2017-02-28

    The color of food is often associated with the flavor, safety, and nutritional value of the product. Synthetic food colorants have been used because of their high stability and low cost. However, consumer perception and demand have driven the replacement of synthetic colorants with naturally derived alternatives. Natural pigment applications can be limited by lower stability, weaker tinctorial strength, interactions with food ingredients, and inability to match desired hues. Therefore, no single naturally derived colorant can serve as a universal alternative for a specified synthetic colorant in all applications. This review summarizes major environmental and biological sources for natural colorants as well as nature-identical counterparts. Chemical characteristics of prevalent pigments, including anthocyanins, carotenoids, betalains, and chlorophylls, are described. The possible applications and hues (warm, cool, and achromatic) of currently used natural pigments, such as anthocyanins as red and blue colorants, and possible future alternatives, such as purple violacein and red pyranoanthocyanins, are also discussed.

  5. Para-bosons and Para-fermions in Quantum Mechanics

    International Nuclear Information System (INIS)

    Cattani, M.S.D.; Fernandes, N.C.

    1982-01-01

    Within the framework of the ordinary quantum mechanics, a detailed study of the energy eigenfunctions of N identical particles using the irreducible representations of the permutation group in the Hilbert space is performed. It is shown that the para-states, as occurs with the boson and fermion states, are compatible with the postulates of quantum mechanics and with the principle of indistinguishability. A mathematical support for the existence of para-bosons and para-fermions is given. Gentile's quantum statistics is, in a certain sense, justified. (Author) [pt

  6. Regularities, Natural Patterns and Laws of Nature

    Directory of Open Access Journals (Sweden)

    Stathis Psillos

    2014-02-01

    Full Text Available  The goal of this paper is to sketch an empiricist metaphysics of laws of nature. The key idea is that there are regularities without regularity-enforcers. Differently put, there are natural laws without law-makers of a distinct metaphysical kind. This sketch will rely on the concept of a natural pattern and more significantly on the existence of a network of natural patterns in nature. The relation between a regularity and a pattern will be analysed in terms of mereology.  Here is the road map. In section 2, I will briefly discuss the relation between empiricism and metaphysics, aiming to show that an empiricist metaphysics is possible. In section 3, I will offer arguments against stronger metaphysical views of laws. Then, in section 4 I will motivate nomic objectivism. In section 5, I will address the question ‘what is a regularity?’ and will develop a novel answer to it, based on the notion of a natural pattern. In section 6, I will raise the question: ‘what is a law of nature?’, the answer to which will be: a law of nature is a regularity that is characterised by the unity of a natural pattern.

  7. Comunicaciones para cómputo paralelo intercluster

    OpenAIRE

    Aróztegui, Walter J.; Romero, Fernando; Tinetti, Fernando Gustavo

    2006-01-01

    Esta línea de investigación se orienta a resolver el problema general de las comunicaciones entre clusters usados para cómputo paralelo. La idea e partida es todo lo conocido de cómputo paralelo en clusters. En este sentido, utilizar más de un cluster para cómputo paralelo se puede considerar como una extensión natural del procesamiento paralelo en plataformas de cómputo distribuidas. En esta línea de investigación se busca, por lo tanto, resolver el problema de comunicar procesos en difer...

  8. FUNCIONES ORTOGONALES EMPÍRICAS (EOF APLICADAS A LAS CUENCAS OCEÁNICAS TROPICALES INDO-PACÍFICA Y ATLÁNTICA: CONTRIBUCIONES AL ANÁLISIS DE LAS CONDICIONES DE COBERTURA DE NUBES EN EL PARQUE NACIONAL NATURAL LOS NEVADOS FUNÇÕES ORTOGONAIS EMPÍRICAS (EOF APLICADAS ÀS BACIAS OCEÂNICAS TROPICAIS INDO-PACÍFICA E ATLÂNTICA: CONTRIBUIÇÕES PARA A ANÁLISE DAS CONDIÇÕES DA COBERTURA DE NUVENS NO PARQUE NACIONAL NATURAL LOS NEVADOS INDO-PACIFIC AND TROPICAL ATLANTIC EOF MODES: CONTRIBUTIONS TO THE ANALYSES OF CLOUD COVER CONDITIONS IN THE LOS NEVADOS NATURAL PARK

    Directory of Open Access Journals (Sweden)

    DANIEL RUIZ CARRASCAL

    2010-12-01

    Full Text Available Los páramos colombianos están experimentando un aumento en su estrés climático. Uno de los factores clave detrás de esto es el cambio en las condiciones de cobertura de nubes, que dependen de procesos regionales y locales. Este trabajo busca explorar el grado de asociación entre la variabilidad año a año de las temperaturas superficiales del mar (TSM observadas en las zonas tropicales de los océanos Índico-Pacífico y Atlántico y los cambios de año a año en las condiciones de cobertura regional de nubes imperantes en la cordillera Central de Colombia, pero enfocándose en el píxel de la retícula satelital donde se encuentran el macizo volcánico Ruiz-Tolima, el Parque Nacional Natural Los Nevados y sus alrededores. Los registros analizados incluyen valores promedio mensuales de TSM observados en la región Niño 3.4 del Pacífico ecuatorial, anomalías de las TSM observadas en las cuencas tropicales del Índico-Pacífico y el Atlántico, así como la cobertura de nubes de todo tipo y la presión atmosférica en su capa alta observadas sobre los Andes septentrionales. Aunque se procesan los datos de cuatro meses "secos", la discusión se centra en las condiciones de enero, cuando las zonas de alta montaña de la cordillera Central de Colombia están expuestas a máximos de brillo solar. Los análisis de funciones ortogonales empíricas (EOF / componentes principales (PC se llevan a cabo para identificar los principales modos de variabilidad de las TSM, tales como El Niño-Oscilación del Sur (ENOS. Los primeros modos de EOF en las anomalías de las TSM observadas en enero en las regiones 30°S a 30°N y 15°S a 15°N del Índico-Pacífico representan, en particular, la fase madura del ENOS y explican el 30,7 % y 44,3 %, respectivamente, de la variabilidad espacio-temporal de las anomalías de las TSM en enero. El primer modo de EOF de anomalías de las TSM observadas en enero en las latitudes 19°S a 29°N del Atlántico tropical

  9. Marcadores para la Realidad Aumentada para fines educativos

    Directory of Open Access Journals (Sweden)

    María Reina Zarate Nava

    2013-12-01

    Full Text Available La Realidad Aumentada (AR es considerada por algunos expertos como la tecnología en crecimiento para el 2014, en diferentes sectores: ingeniería, educación, juegos y negocios, siendo este último el más usado en él 2013. Sin embargo en el sector educativo la AR se presenta en algunos proyectos que se han desarrollado para diferentes áreas de las ciencias, como Química, Física y Matemáticas, lo anterior con el objetivo de facilitar el proceso de Enseñanza-Aprendizaje. En el presente artículo se presenta el modelo de patrones utilizado para un Proyecto AR enfocado en Química, el cual presenta un conjunto de patrones que fueron valorados para facilitar el rastreo de los objetos y a su vez el entendimiento de algunos materiales de los laboratorios de Química I.

  10. Thomasius e o Direito Natural

    Directory of Open Access Journals (Sweden)

    Gustavo César Machado Cabral

    2016-04-01

    Full Text Available http://dx.doi.org/10.5007/2177-7055.2016v37n72p145 Este trabalho discutirá as concepções de Christian Thomasius sobre o direito natural, a partir da sua principal obra, Fundamenta iure natura et gentium. Thomasius foi um dos mais importantes representantes do jusnaturalismo racionalista, ao lado de Hugo Grotius, Samuel von Pufendorf e Christian Wolff, ele contribuiu decisivamente para a formação do direito moderno. Pretende-se neste artigo esclarecer os mais determinates pressupostos da obra de Thomasius, relacioná-los aos ramos mais importantes do direito à época (direito privado, direito penal e ius publicum e, finalmente, demonstrar a difusão das obras de Thomasius pela Europa.

  11. Una agenda para educadores

    Directory of Open Access Journals (Sweden)

    Robert O. McClintock

    2007-01-01

    Full Text Available Las instituciones educativas constituyen los principales factores en la construcción social de un nuevo sistema educativo. Las escuelas y los educadores controlan y producen propiedad intelectual de una extraordinaria profundidad y amplitud. Los cambios producidos por las tecnologías digitales están consiguiendo que el acceso y la producción de conocimiento sea más accesible y universal. Lo que es, a la vez, un gran logro de apertura curricular, pero también un grave peligro de perder la perspectiva eminentemente “educativa” de la transmisión del conocimiento en la escuela. Los nuevos recursos permiten a los educadores romper el ciclo de reproducción en los logros educativos, acercarse al medio y a la familia y transformar la escuela. Los educadores y las escuelas deben asumir el reto de constituir comunidades de aprendizaje. Así como de atreverse a producir y difundir ese conocimiento con soporte digital. Lo contrario sería una terrible abdicación. El artículo traza un recorrido histórico sobre esta función de la escuela y su adaptación a los medios y recursos de cada época. Tras lo cual, aboga por asumir el desafío actual de las TICs, para renovar el vínculo progresista con la posteridad y construir un mejor futuro. Los nuevos recursos permiten a los educadores romper el ciclo de reproducción en los logros educativos, acercarse al medio y a la familia y transformar la escuela.

  12. What is 'Natural'in Natural Selection?

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 18; Issue 5. What is 'Natural' in Natural Selection? Abhijeet S Bardapurkar. Classroom Volume 18 Issue 5 May 2013 pp 475-482. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/018/05/0475-0482. Keywords.

  13. Natural and near natural tropical forest values

    Science.gov (United States)

    Daniel H. Henning

    2011-01-01

    This paper identifies and describes some of the values associated with tropical rain forests in their natural and near-natural conditions. Tropical rain forests are moist forests in the humid tropics where temperature and rainfall are high and the dry season is short. These closed (non-logged) and broad-leaved forests are a global resource. Located almost entirely in...

  14. Learning from nature: Nature-inspired algorithms

    DEFF Research Database (Denmark)

    Albeanu, Grigore; Madsen, Henrik; Popentiu-Vladicescu, Florin

    2016-01-01

    During last decade, the nature has inspired researchers to develop new algorithms. The largest collection of nature-inspired algorithms is biology-inspired: swarm intelligence (particle swarm optimization, ant colony optimization, cuckoo search, bees' algorithm, bat algorithm, firefly algorithm etc...

  15. EFICIÊNCIA DO ENRIQUECIMENTO EM DUPLO ESTÁGIO REALIZADO NOS CALDOS UVM E FRASER E DESEMPENHO DOS ÁGARES LPM E LSAB-CAN PARA A DETECÇÃO DE Listeria spp. EM CARNE DE FRANGO NATURALMENTE CONTAMINADA EFFICIENCY OF DOUBLE STEPS ENRICHMENT IN THE UVM AND FRASER BROTHES AND PERFORMANCE OF LPM AND LSAB-CAN AGARS TO DETECTION OF Listeria spp. IN NATURALLY CONTAMINATED CHICKEN MEAT

    Directory of Open Access Journals (Sweden)

    Albenones José de Mesquita

    2007-09-01

    Full Text Available

    No presente trabalho, avaliou-se o desempenho de dois caldos e dois ágares seletivos para o isolamento de Listeria a partir de carne de frango naturalmente contaminada, adquirida no comércio varejista de Goiânia - GO, no período de janeiro a junho de 1992. A metodologia de isolamento e identificação de Listeria adotada envolveu a utilização de enriquecimento seletivo em estágio duplo nos caldos "University of Vermont" e Fraser e plaqueamento no ágar cloreto de lítio-feniletanol-moxalactam e no ágar base seletivo para Listeria, suplementado com cicloheximide, acriflavina e ácido nalidíxico. Verificou-se o desempenho dos caldos e enriquecimento para Listeria (caldos UVM e Fraser, associados à passagem da cultura por uma solução de hidróxido de potássio a 0,25%, constatando-se que os mesmos se equivaleram estatisticamente (Z= -1,7393<1,96. Por outro lado, o ágar LPM apresentou destacada superioridade frente ao ágar LSAB-CAN em relação ao total de amostras analisadas (Z= 7, 368>Z0,975. O tratamento da cultura com a solução de hidróxido de potássio a 0,25% mostrou ligeira inibição, contribuindo para redução no número de amostras positivas detectadas.

    PALAVRAS-CHAVE: Listeria; caldo de enriquecimento; carne de frango.

    It was determined the performance of two selective broths and two agars to isolate Listeria from chicken meat naturally contaminated, acquired in the supermarkets of Goiânia-Goiás, between January and June 1992. Methodology of isolation involved the utilization of two-stage selective enrichment in the University of Vermont and Fraser broths and plating in lithium chloride-phenyletanol-moxalactam agar and the Listeria selective agar base supplemented with cicloheximide

  16. Three Sorts of Naturalism

    DEFF Research Database (Denmark)

    Fink, Hans

    2006-01-01

    In "Two sorts of Naturalism" John McDowell is sketching his own sort of naturalism in ethics as an alternative to "bald naturalism". In this paper I distinguish materialist, idealist and absolute conceptions of nature and of naturalism in order to provide a framework for a clearer understanding...... of what McDowell's own naturalism amounts to. I argue that nothing short of an absolute naturalism will do for a number of McDowell's own purposes, but that it is far from obvious that this is his position. If he directly denies that it is, he seems to be left with some rather awkward choices....

  17. Three Sorts of Naturalism

    OpenAIRE

    Fink, Hans

    2006-01-01

    In "Two sorts of Naturalism" John McDowell is sketching his own sort of naturalism in ethics as an alternative to "bald naturalism". In this paper I distinguish materialist, idealist and absolute conceptions of nature and of naturalism in order to provide a framework for a clearer understanding of what McDowell's own naturalism amounts to. I argue that nothing short of an absolute naturalism will do for a number of McDowell's own purposes, but that it is far from obvious that this is his posi...

  18. The Nature of Natural Hazards Communication (Invited)

    Science.gov (United States)

    Kontar, Y. Y.

    2013-12-01

    Some of the many issues of interest to natural hazards professionals include the analysis of proactive approaches to the governance of risk from natural hazards and approaches to broaden the scope of public policies related to the management of risks from natural hazards, as well as including emergency and environmental management, community development and spatial planning related to natural hazards. During the talk we will present results of scientific review, analysis and synthesis, which emphasize same new trends in communication of the natural hazards theories and practices within an up-to-the-minute context of new environmental and climate change issues, new technologies, and a new focus on resiliency. The presentation is divided into five sections that focus on natural hazards communication in terms of education, risk management, public discourse, engaging the public, theoretical perspectives, and new media. It includes results of case studies and best practices. It delves into natural hazards communication theories, including diffusion, argumentation, and constructivism, to name a few. The presentation will provide information about: (1) A manual of natural hazards communication for scientists, policymakers, and media; (2) An up-to-the-minute context of environmental hazards, new technologies & political landscape; (3) A work by natural hazards scientists for geoscientists working with social scientists and communication principles; (4) A work underpinned by key natural hazards communication theories and interspersed with pragmatic solutions; (5) A work that crosses traditional natural hazards boundaries: international, interdisciplinary, theoretical/applied. We will further explore how spatial planning can contribute to risk governance by influencing the occupation of natural hazard-prone areas, and review the central role of emergency management in risk policy. The goal of this presentation is to contribute to the augmentation of the conceptual framework

  19. O uso de técnicas geoestatísticas para o mapeamento da vulnerabilidade natural do Aquífero Guarani em área de recarga: aplicação na região de Ribeirão Bonito - SP

    OpenAIRE

    Ferreira, Gabriela Trigo [UNESP

    2014-01-01

    The Guarani Aquifer has recharge areas where it is exposed and therefore subject to contamination by effluents and tailings deposited on soils that cover this areas. Therefore it is extremely important the knowledge of his natural vulnerability, contributing for their protection at all levels. The project presents an alternative and quantitative form of mapping the natural aquifer vulnerability by applying the method AVI. The AVI Index, used as a measure of vulnerability, requires the ratio b...

  20. Caucho Natural y Caucho Sintético

    Directory of Open Access Journals (Sweden)

    Bekkedahl Norman

    1946-04-01

    Full Text Available El Dr. Bekkedahl escribió así: ¿Cuál es el mejor caucho, el natural o el sintético? ¿Puede el caucho natural competir con el caucho sintético? Estas son dos importantes preguntas que se hacen frecuentemente. Las respuestas son demasiado complejas para poderlas explicar en pocas palabras. Esta charla tendrá como fin la consideración de estas cuestiones en sus varios aspectos para tratar luego de sacar algunas conclusiones.

  1. Caucho natural y caucho sintético

    OpenAIRE

    Bekkedahl, Norman

    2012-01-01

    El Dr. Bekkedahl escribió así: ¿Cuál es el mejor caucho, el natural o el sintético? ¿Puede el caucho natural competir con el caucho sintético? Estas son dos importantes preguntas que se hacen frecuentemente. Las respuestas son demasiado complejas para poderlas explicar en pocas palabras. Esta charla tendrá como fin la consideración de estas cuestiones en sus varios aspectos para tratar luego de sacar algunas conclusiones.

  2. Diseño y simulación de un sistema de iluminación natural energéticamente eficiente de una planta industrial dedicada al pintado de piezas plásticas para la industria de la automoción

    OpenAIRE

    YE ZHU, DINGDING

    2017-01-01

    El desarrollo de este trabajo se centra en el diseño y simulación de un sistema de iluminación, buscando la eficiencia energética de éste, partiendo desde la premisa de que la nave seleccionada trabaja con un sistema de iluminación 100% artificial. La planta elegida, es una planta de pintura en base disolvente, de piezas plásticas para automoción. Primeramente, se comienza con el desarrollo del marco teórico del trabajo, en el que se comentará brevemente el sector de la automoción, el ...

  3. Uma ferramenta para planejamento de estudos para concursos

    Directory of Open Access Journals (Sweden)

    Leonardo Pimentel

    2015-11-01

    Full Text Available De acordo com a constituição brasileira, a única forma de se tornar um empregado do governo é passar em um concurso público. O exame de conhecimento do cargo é um dos componentes mais importantes de um concurso. Estudar para esse exame é uma tarefa que requer planejamento. Um meio de obter um bom planejamento é construir uma grade de horários que relacione as matérias a serem estudadas com os respectivos horários disponíveis para o estudo. Esse tipo de problema se assemelha bastante à gerência de projetos, em que se procura estabelecer a distribuição das atividades ao longo do tempo disponível. Assim, torna-se interessante explorar a dinâmica de estudos para concursos como um projeto. O presente trabalho apresenta a ferramenta de apoio ao estudos - Passe-me, baseada no ciclo PDCA (do inglês, Plan-Do-Check-Act. Por se tratar de uma ferramenta web, o tempo de resposta para produzir uma grade de estudos é fundamental. A ferramenta faz uso de algoritmo genético para calcular a grade de horários priorizando a velocidade de resposta. A ferramenta foi avaliada em diferentes cenários de uso e obteve desempenho satisfatório durante a produção da grade de estudos.

  4. El clima y la ecología, un espacio para actuar por nuestro planeta, propuesta de objeto virtual de aprendizaje (OVA) para ciclo III

    OpenAIRE

    Camelo Salamanca, Zuly Constanza

    2014-01-01

    Algunos conceptos fundamentales para la comprensión de la problemática del Calentamiento Global, han presentado dificultades en su enseñanza debido a la complejidad que envuelven, adicionalmente, las fuentes de información que es llevada a la escuela, en su mayoría se limita a libros de texto con imágenes estáticas. Las herramientas tecnológicas en el apoyo pedagógico brindan el espacio para la utilización y cobertura de actividades apropiadas para recrear fenómenos de la natur...

  5. Eficácia de herbicidas na dessecação de aveia-preta para formação de cobertura morta em plantio direto Herbicides efficacy on black oats (Avena strigosa desiccation in no-tillage system

    Directory of Open Access Journals (Sweden)

    Francisco Skóra Neto

    1995-01-01

    Full Text Available A dessecação da aveia-preta (Avena strigosa schieb para formação de cobertura do solo foi feita com sulfosate nas doses de 96, 288 e 480 g/ha e paraquat + diuron nas doses de 100+50, 200+100 e 300+150 g/ha em volumes de aplicação de 100, 214 e 325 l/ha de calda. A formulação de paraquat + diuron adicionou-se um surfactante não-iônico a 0,1% v/v. O delineamento experimental utilizado foi o de blocos ao acaso com quatro repetições e os tratamentos foram dispostos em esquema de parcelas subdivididas. Nas parcelas, estudaram-se as doses dos herbicidas e nas subparcelas, os volumes de aplicação. O Sulfosate dessecou a aveia-preta nas doses de 288 e 480 g/ha, nos três volumes de aplicação, não se observando qualquer rebrota aos 32 dias após a pulverização. A formulação de paraquat + diuron foi ineficiente na dessecação da aveia-preta.Black oats (Avena strigosa desiccation for mulching was done with sulfosate at 96, 288 and 480 g/ha and the formulation of paraquat + diuron at 100+50, 200+100 and 300+150 g/ha at spraying volumes of 100, 214 and 325 I/ha. A nonionic surfactant was added to the paraquat+diuron solution. The experimental design was a split-plot randomized block with four replicates. Herbicide doses were the main plot treatments and the spraying volumes, the sub-plot treatments. Plants of black oats were controled with sulfosate doses of 288 and 480 g/ha at the three spraying volumes. There was no regrowth at 32 days after the spraying. Paraquat + diuron was not efficient for desiccating black oats.

  6. Natural Chankanaab de Cozumel, México

    Directory of Open Access Journals (Sweden)

    Romano Gino Segrado Pavón

    2015-01-01

    Full Text Available El objetivo general fue determinar la capacidad de carga turística (CCT que puede realizar diariamente el Parque Natural Chankanaab, destino masivo para los excursionistas de cruceros que arriban a la isla de Cozumel, México. La hipótesis estableció que la CCT ha sido superada en las temporadas vacacionales. Se aplicó el método de Cifuentes et al. durante 2011, que analiza aspectos físicos, ecológicos y administrativos. Se determinó que la CCT está restringida por la infraestructura del Parque y ha sido rebasada ocasionalmente en temporada alta. Para lograr un aprovechamiento sustentable de las ANP, el método requiere incorporar el área de influencia, las dimensiones social y económica de la comunidad anfitriona, así como la percepción de los visitantes, para lo cual se propone un modelo de aprovechamiento turístico sustentable para las ANP.

  7. Natural short sleeper

    Science.gov (United States)

    Sleep - natural short sleeper ... 7 to 9 hours of sleep each night. Short sleepers sleep less than 75% of what is normal for their age. Natural short sleepers are different from people who chronically do ...

  8. Natural gas annual 1996

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-09-01

    This document provides information on the supply and disposition of natural gas to a wide audience. The 1996 data are presented in a sequence that follows natural gas from it`s production to it`s end use.

  9. Vermont Natural Resources Atlas

    Data.gov (United States)

    Vermont Center for Geographic Information — The purpose of the�Natural Resources Atlas�is to provide geographic information about environmental features and sites that the Vermont Agency of Natural Resources...

  10. Natural Weathering Exposure Station

    Data.gov (United States)

    Federal Laboratory Consortium — The Corps of Engineers' Treat Island Natural Weathering Exposure Station is a long-term natural weathering facility used to study concrete durability. Located on the...

  11. Natural Language Processing

    OpenAIRE

    Preeti; BrahmaleenKaurSidhu

    2013-01-01

    Natural language processing (NLP) work began more than sixty years ago; it is a field of computer science and linguistics devoted to creating computer systems that use human (natural) language. Natural Language Processing holds great promise for making computer interfaces that are easier to use for people, since people will be able to talk to the computer in their own language, rather than learn a specialized language of computer commands. Natural Language processing techniques can make possi...

  12. Natural gas annual 1993

    International Nuclear Information System (INIS)

    1994-01-01

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1993 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. Tables summarizing natural gas supply and disposition from 1989 to 1993 are given for each Census Division and each State. Annual historical data are shown at the national level

  13. Natural gas annual 1994

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-11-17

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1994 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. This is followed by tables summarizing natural gas supply and disposition from 1990 to 1994 for each Census Division and each State. Annual historical data are shown at the national level.

  14. Natural gas annual 1995

    International Nuclear Information System (INIS)

    1996-11-01

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1995 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. This is followed by tables summarizing natural gas supply and disposition from 1991 to 1995 for each Census Division and each State. Annual historical data are shown at the national level

  15. Natural gas annual 1991

    International Nuclear Information System (INIS)

    1992-01-01

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1991 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. Tables summarizing natural gas supply and disposition form 1987 to 1991 are given for each Census Division and each State. Annual historical data are shown at the national level

  16. Natural Gas Basics

    Energy Technology Data Exchange (ETDEWEB)

    2016-06-01

    Natural gas powers about 150,000 vehicles in the United States and roughly 22 million vehicles worldwide. Natural gas vehicles (NGVs) are a good choice for high-mileage fleets -- such as buses, taxis, and refuse vehicles -- that are centrally fueled or operate within a limited area or along a route with natural gas fueling stations. This brochure highlights the advantages of natural gas as an alternative fuel, including its domestic availability, established distribution network, relatively low cost, and emissions benefits.

  17. Natural Gas Basics

    Energy Technology Data Exchange (ETDEWEB)

    None

    2016-06-08

    Natural gas powers about 150,000 vehicles in the United States and roughly 22 million vehicles worldwide. Natural gas vehicles (NGVs) are a good choice for high-mileage fleets -- such as buses, taxis, and refuse vehicles -- that are centrally fueled or operate within a limited area or along a route with natural gas fueling stations. This brochure highlights the advantages of natural gas as an alternative fuel, including its domestic availability, established distribution network, relatively low cost, and emissions benefits.

  18. Registro recente de harpia, Harpia harpyja (Linnaeus) (Aves, Accipitridae), na Mata Atlântica da Reserva Natural Vale do Rio Doce, Linhares, Espírito Santo e implicações para a conservação regional da espécie Recent record of harpy eagle, Harpia harpyja (Linnaeus) (Aves, Accipitridae), in Atlantic forest of Vale do Rio Doce Natural Reserve, Linhares, Espírito Santo, Brazil and implications for the regional conservation of the species

    OpenAIRE

    Ana C. Srbek-Araujo; Adriano G. Chiarello

    2006-01-01

    A presente comunicação reporta o registro de um macho adulto de harpia, Harpia harpyja (Linnaeus, 1758), na Reserva Natural da Vale do Rio Doce (RNVRD), região norte do Espírito Santo, em agosto de 2005. A análise deste e de registros históricos da espécie nesta reserva indica a presença de uma população residente na região compreendida pela RNVRD e pela Reserva Biológica de Sooretama. Estas duas reservas, contíguas entre si, compreendem cerca de 46250 ha de Floresta Atlântica de baixada (Mat...

  19. Masterplan para UNIMAK y Estrategias para la ciudad de Makeni

    OpenAIRE

    Bacete Cebrian, Laura

    2012-01-01

    El proyecto se desarrolla en tres escalas. Por un lado están las propuestas a nivel ciudad muy relacionadas con la siguiente escala, la de la universidad, y por último hay una escala de detalle, tanto para ciudad como para universidad. Se plantea la creación de unos nodos interconectados por los corredores verdes de la ciudad que den servicios básicos a la ciudad tales gestión de residuos, equipamientos públicos, puntos de agua, saneamiento...)

  20. Natural gas annual 1991

    International Nuclear Information System (INIS)

    1993-01-01

    The Natural Gas Annual 1991 provides information on the supply and disposition of natural gas to a wide audience including industry, consumers Federal and State agencies, and education institutions. This report, the Natural Gas Annual 1991 Supplement: Company Profiles, presents a detailed profile of selected companies

  1. Naturalisms and religion

    NARCIS (Netherlands)

    Drees, Willem

    1997-01-01

    Such terms as materialism, naturalism, and near synonyms evoke strong negative reactions among many believers. However, the notion of naturalism has various meanings; implications for religion differ for the several varieties of naturalism. In this paper I analyze epistemological and ontological

  2. Natural gas for vehicles

    International Nuclear Information System (INIS)

    Prieur, A.

    2006-01-01

    Following a decade-long upsurge in the use of natural gas in the energy sector (heating and especially electricity), new outlets for natural gas are being developed in the transport sector. For countries endowed with substantial local resources, development in this sector can help reduce oil dependence. In addition, natural gas is often used to reduce pollution, particularly in cities

  3. Nature and Health

    NARCIS (Netherlands)

    Hartig, T.; Mitchell, R.; Vries, de S.; Frumkin, H.

    2014-01-01

    Urbanization, resource exploitation, and lifestyle changes have diminished possibilities for human contact with nature in urbanized societies. Concern about the loss has helped motivate research on the health benefits of contact with nature. Reviewing that research here, we focus on nature as

  4. Aproximacón al cálculo del crecimiento real de Colombia: aportes metodológicos para la inclusión en las cuentas nacionales de los impactos del agotamiento del carbón y del gas natural

    Directory of Open Access Journals (Sweden)

    Michée Arnold Lachaud

    2011-01-01

    Full Text Available The integrated accounting system considers the natural resource depletion issues. We analyze the difference between this system and the traditional national accounting system, using data from the mining sector in Colombia (natural gas and coal. Results show that by including the impact of these two resources exhaustion, the traditional GDP would be overestimated; while it grew at an annual rate of 2.2% for the period 1995-2005, adjusted GDP would show a grow rate of 1.3%, reflecting costs on real country growth. These results open a debate given the current proposal of basing part of economic growth in Colombia on mining.

  5. Capturing Nature's Diversity

    Science.gov (United States)

    Pascolutti, Mauro; Campitelli, Marc; Nguyen, Bao; Pham, Ngoc; Gorse, Alain-Dominique; Quinn, Ronald J.

    2015-01-01

    Natural products are universally recognized to contribute valuable chemical diversity to the design of molecular screening libraries. The analysis undertaken in this work, provides a foundation for the generation of fragment screening libraries that capture the diverse range of molecular recognition building blocks embedded within natural products. Physicochemical properties were used to select fragment-sized natural products from a database of known natural products (Dictionary of Natural Products). PCA analysis was used to illustrate the positioning of the fragment subset within the property space of the non-fragment sized natural products in the dataset. Structural diversity was analysed by three distinct methods: atom function analysis, using pharmacophore fingerprints, atom type analysis, using radial fingerprints, and scaffold analysis. Small pharmacophore triplets, representing the range of chemical features present in natural products that are capable of engaging in molecular interactions with small, contiguous areas of protein binding surfaces, were analysed. We demonstrate that fragment-sized natural products capture more than half of the small pharmacophore triplet diversity observed in non fragment-sized natural product datasets. Atom type analysis using radial fingerprints was represented by a self-organizing map. We examined the structural diversity of non-flat fragment-sized natural product scaffolds, rich in sp3 configured centres. From these results we demonstrate that 2-ring fragment-sized natural products effectively balance the opposing characteristics of minimal complexity and broad structural diversity when compared to the larger, more complex fragment-like natural products. These naturally-derived fragments could be used as the starting point for the generation of a highly diverse library with the scope for further medicinal chemistry elaboration due to their minimal structural complexity. This study highlights the possibility to capture a

  6. Nature in Preschool

    DEFF Research Database (Denmark)

    Husted, Mia; Frøkjær, Thorleif

    Nature and nature phenomena’ has formed a specific curriculum theme in Danish preschool since early childhood curriculum was prescribed by law in 2004. However, recent evaluations show that the implementation of an early childhood curriculum has not produced an increased pedagogical focus...... on ‘nature and nature phenomena’ in preschools (EVA 2012). This finding, along with an increased political interest in goals and measurable outcome of early childhood curriculum (Broström 2012), will be the starting point in our ambition to carry out a more thorough qualitative investigation into links...... between preschool teachers’ understanding and interest in teaching nature and the rather poor evaluation....

  7. Natural gas marketing II

    International Nuclear Information System (INIS)

    Anon.

    1988-01-01

    This book covers all aspects of gas marketing, from the basic regulatory structure to the latest developments in negotiating agreements and locating markets. Topics include: Federal regulation of the gas industry; Fundamentals of gas marketing contracts; FERC actions encouraging competitive markets; Marketing conditions from the pipelines' perspective; State non-utility regulation of natural gas production, transportation, and marketing; Natural gas wellhead agreements and tariffs; Natural gas processing agreements; Effective management of producer's natural gas contracts; Producer-pipeline litigation; Natural gas purchasing from the perspective of industrial gas users; Gas marketing by co-owners: problems of disproportionate sales, gas balancing, and accounting to royalty owners; Alternatives and new directions in marketing

  8. Taller para desarrollar la creatividad

    OpenAIRE

    MARTÍNEZ GUEROLA, BEATRIZ

    2015-01-01

    [ES] Partimos de la base de que la creatividad es una capacidad realmente valiosa, no solo para el ámbito artístico, si no para cualquier aspecto de la vida. Este proyecto está enfocado a un taller diseñado para que a partir de técnicas de expresión gráfico-plásticas podamos estimular y desarrollar la creatividad, principalmente en niños de tercer ciclo de primaria. Con este proyecto relacionamos el arte y la creatividad que se asocia a esté con la educación. Martínez Guerola, B. (2015). T...

  9. Tabla de Especificaciones e Instructivo sobre Elaboracion de Pruebas Objetivas en la Ensenanza Primaria, para las asignaturas de Estudios Sociales, Idioma Espanol, Matematicas y Ciencias Naturales (Specification Tables and Instructions for the Construction of Objective Tests in the Primary Grades in Social Studies, Spanish, Mathematics, and Natural Sciences).

    Science.gov (United States)

    Ministerio de Educacion, Guatemala City (Guatemala). Direccion de Bienestar Estudiantil y Educacion Especial.

    This booklet presents specification tables illustrating the relative importance given to topics on tests within a particular subject area. The general subject areas are social studies, Spanish, mathematics, and natural sciences. Tables are provided for final exams in each of these areas for several primary grades, illustrating the importance of…

  10. La pastora y el cóndor: de los antagonismos entre naturaleza y cultura a los antagonismos de género; A pastora e o condor: desde os antagonismos entre natureza e cultura para os antagonismos de gênero; The shepherdess and the condor: from the antagonisms between nature and culture to gender antagonisms

    Directory of Open Access Journals (Sweden)

    Graciela Hernández

    2018-01-01

    Full Text Available Resumen: Nos proponemos analizar un relato clasificado como cuento por la narradora, al que   denominamos “la pastora y el cóndor”. Se trata de un trabajo cualitativo etnográfico en un taller de historia oral en educación primaria de adulto/as, en un espacio de producción de cebollas y de migración desde Bolivia al sudoeste de la provincia de Buenos Aires, en la Argentina. Las principales conclusiones a las que llegamos es que pudimos ver como este cuento nos muestra al cóndor como el emblema de hombre autoritario y fue el punto de partida para hablar de los antagonismos del género y para dialogar sobre las experiencias subjetivas de los derechos afectivos y sexuales de las mujeres. Palabras clave: Narrativa, Etnografía, Género, Feminismos, Memoria.   Resumo: Propomos analisar uma história classificada como uma história pelo narrador, que chamamos  "a pastora e o condor". É um trabalho etnográfico qualitativo em uma oficina de história oral na educação primária de adultos/as, em um espaço de produção de cebola e migração da Bolívia ao sudoeste da província de Buenos Aires, na Argentina. As principais conclusões que alcançamos é que podemos ver como essa história mostra o condor como o emblema do homem autoritário e foi o ponto de partida para falar sobre os antagonismos do gênero e para discutir as experiências subjetivas de direitos afetivos e sexual das mulheres. Palabras-chave: Narrativa, etnografia, gênero, feminismos, memória.   Abstract: We mean to analyse a story classified as tale by its narrator, and which we have called ‘the shepherdess and the condor’.  The plot of this account describes the vicissitudes of a female shepherd keeper of some sheep and goats who was deceived by a condor –who looked like a handsome man- and practically kidnapped her and took her to his cave. In the condor’s dwelling the young woman suffered from the isolation in the high mountain, from her impossibility

  11. On nature and bioethics.

    Science.gov (United States)

    Peterson, Paul Silas

    2010-01-01

    The account of nature and humanity's relationship to nature are of central importance for bioethics. The Scientific Revolution was a critical development in the history of this question and many contemporary accounts of nature find their beginnings here. While the innovative approach to nature going out of the seventeenth century was reliant upon accounts of nature from the early modern period, the Middle Ages, late-antiquity and antiquity, it also parted ways with some of the understandings of nature from these epochs. Here I analyze this development and suggests that some of the insights from older understandings of nature may be helpful for bioethics today, even if there can be no simple return to them.

  12. Estrategias Digitales Para Los Negocios

    OpenAIRE

    Sánchez, Nicolás David; Porras, María Paula

    2016-01-01

    Este trabajo es para fines institucionales de la Universidad del Rosario. A lo largo del segundo semestre del año 2016 entendimos la importancia de los medios digitales para las empresas, por lo cual el profesor Juan Manuel Méndez nos dio el caso de las bicicletas de Nairo Quintana con el cual teníamos que desarrollar un plan de estrategias digitales acorde con el contexto actual del sector de las bicicletas, en donde se creara y desarrollara la marca de la agencia digital creada por los estu...

  13. CODIFEXA - Colecciones Digitales para Exactas

    OpenAIRE

    Olguín, Luis Alberto; Klenzi, Raúl O.

    2013-01-01

    La construcción de repositorios institucionales (RI) por parte de facultades de universidades argentinas es cada vez más significativa, pero para que este tipo de emprendimientos – generalmente con presupuestos ajustados – tenga sustentabilidad en el tiempo es necesario “mostrar que es útil” para la institución - los docentes en particular - en el sentido que permite aumentar la visibilidad de la producción científica local y por ende el impacto entre sus pares. El proyecto que aquí descri...

  14. A aptidão de uso da terra como base para o planejamento da utilização dos recursos naturais no município de São João do Polêsine - RS Land suitability as a base for natural resource use planning at the São João do Polesine county - Rio Grande do Sul/ State - Brazil

    Directory of Open Access Journals (Sweden)

    Fabrício de Araújo Pedron

    2006-02-01

    Full Text Available A falta de conhecimento da aptidão de uso da terra e do planejamento adequado da sua utilização tem sido fato freqüente ocasionando impactos negativos ao meio ambiente. Neste sentido, os objetivos deste trabalho foram determinar a aptidão de uso, uso atual e os conflitos de uso da terra, visando contribuir para o planejamento racional dos recursos naturais no município de São João do Polêsine (SJP, RS. A análise ambiental foi efetuada através da integração de diferentes planos de informações como solos, relevo, hidrografia, aptidão agrícola, uso das terras e áreas de preservação permanente (APP. SJP apresenta mais de 50% de sua área destinada a atividades agropecuárias, 14,8% do município enquadra-se como APP, sendo a metade dessa área utilizada inadequadamente. Os principais problemas relacionam-se com a utilização inadequada dos seus recursos naturais, sem considerar a legislação ambiental e a aptidão das terras no processo de planejamento.The lack of knowledge on land use suitability and appropriate planning of its use have been a frequent reality causing negative impacts on the environment. In this way, the objective of this research was to determine land suitability, current land use and conflicts of use, seeking to contribute for the rational planning of the natural resources in the São João do Polêsine (SJP, RS. The environmental analysis was made through the integration of different plans of information as soils, relief, hydrography, agricultural suitability, land use and areas of permanent preservation (APP. SJP presents more than 50% of its area destined to agricultural activities, 14.8% of the SJP are framed as APP, with half of that area being used inadequately. The main problems of the county are related to the inadequate use of natural resources, without considering information regarding to the environmental legislation and land suitability, in the planning process.

  15. The challenges of the implantation of the regulation of AGERBA (State Agency of Regulation of Public Services for Energy and Transport and Communications of Bahia) for residential natural gas in the State of Bahia; Os desafios da implantacao do regulamento da AGERBA (Agencia Estadual de Regulacao de Servicos Publicos de Energia e Transportes e Comunicacoes da Bahia) para o gas natural residencial no estado da Bahia

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Eduardo F. de [Universidade Salvador (UNIFACS), BA (Brazil)], e-mail: eduardosousa@bahiagas.com.br

    2008-07-01

    In recent years, important structural and institutional transformations are observed, for consequence the questions on the energy industries had started to incorporate, the regulation problems. Thus, the simple creation of new regulating agencies does not assure the automatic fulfilment of the functions of public interest. In this new context, these tasks are much more complex, demanding a learning process: how much to the structures of market and how much to the strategical behavior of the companies. In the local scene, to consolidate the distribution of the natural gas for the residential segment is one of the challenges of the Bahiagas, mainly after the publication of the Resolution that will go to establish the General Conditions of Gas Supply Canalized in the Residential Classroom in the State of the Bahia (hearing publishes carried through N. 002/2006 in June/2006). In this context, it is important to deeply understand the Resolution, that consequently will go to print a new dynamics for the Bahiagas. (author)

  16. Mensuração dos custos de laboratório para produção da vespa Cotesia flavipes - inimigo natural da broca da cana-de-açúcar na Usina Naviraí S.A.: uma análise comparativa = Laboratory costs for production of the wasp Cotesia flavipes - natural enemy of the sugar cane borer at the Navirai S.A. factory: A comparative analysis

    Directory of Open Access Journals (Sweden)

    Adélia Megumi Suguiyama

    2015-04-01

    Full Text Available O controle biológico usando parasitoides larvais e parasitóides de ovos específicos ou entomopatógenos (fungos, bactérias ou vírus, manipulados em criatórios artificiais e liberados massivamente para o controle da broca é o mais difundido. Dentre estes, no entanto, o que tem sido comumente utilizado em escala comercial é o controle biológico com parasitóides larvais. Neste contexto, a espécie Cotesia flavipes, é uma vespa parasitóide que combate a broca da cana-de-açúcar Diatraea saccharalis (Lepidóptera, uma praga que causa grandes perdas na produção da cana-de-açúcar. Em função da importância desse tipo de controle biológico, este trabalho tem como objetivo mensurar os custos do sistema de produção de Cotesia flavipes na Usina Naviraí S.A. – Açúcar e Álcool (USINAVI, localizada em Naviraí, Mato Grosso do Sul. Ressalta-se que devido aos danos causados pela broca, os prejuízos no campo chegam a 25% de perda da produtividade da cultura Neste sentido, como principais resultados do presente estudo, sugere-se: 1. Investir em treinamento e qualificação de pessoal de laboratório e de campo; 2. Pesquisas no sentido de ajustar à técnica de controle biológico às condições ecofisiológicas da região de plantio; 3. Controle rigoroso do processo em termos de assepsia e higienização. = The biological control using parasitoids and larval parasitoid eggs or specific entomopathogens (fungi, bacteria or viruses, manipulated in artificial breeding sites and released massively to control drill, is the most widespread. Among these, however, has commonly been used on a commercial scale is biological control using larval parasitoids. In this context, the Cotesia flavipes species is a parasitoid wasp that fighting drill cane sugar Diatraea saccharalis (Lepidoptera, a pest that causes major losses in the production of cane sugar. Because of the importance of this kind of biological control, this paper aims to measure the

  17. Teorias da lei natural: Pufendorf e Rousseau Natural law theories: Pufendorf and Rousseau

    Directory of Open Access Journals (Sweden)

    Luiz Felipe Netto de Andrade e Silva Sahd

    2007-01-01

    Full Text Available O presente artigo tem como objetivo reconstruir argumentos centrais desenvolvidos por Jean-Jacques Rousseau. Contra Samuel Pufendorf, Rousseau defende que a justiça não é natural. Ele recusa todo compromisso com a lei natural tradicional para voltar à posição de Thomas Hobbes. Ora, no estado originário de natureza, os princípios racionais da lei natural que expõe Pufendorf não podem ser conhecidos, e, por conseguinte, quando puderem ser conhecidos, não serão aplicados por natureza.The present article aims at reconstructing Jean-Jacques Rousseau’s central arguments. Against Samuel Pufendorf, Rousseau maintains that justice is not natural, thereby rejecting the compromise with traditional natural law and wholly returning to the position of Thomas Hobbes. Now, in the original state of nature, Pufendorf’s rational principles of natural law cannot be known; later, when they may be known, they are not by nature enforced.

  18. Estudo das dispersões aquosas de nanotubos de carbono utilizando diferentes surfactantes

    Directory of Open Access Journals (Sweden)

    Isabella R. da Silva

    2013-01-01

    Full Text Available The dispersion of carbon nanotubes in water for their utilization in nanoscale devices is a challenging task. Comparative studies on interaction and dispersion of multi-wall carbon nanotubes (MWNT using two different surfactants (sodium dodecyl sulfate, SDS, and polyoxyethylenesorbitanmonooleate, Tween 80 are presented. The interaction between carbon nanotubes and surfactants was studied by tensiometry, conductivimetry, and fluorimetry. The dispersions of MWNT in surfactants were characterized using a UV-vis spectrophotometer. For effective dispersion, the minimum weight ratio of MWNT to surfactant was 1:41 and 1:3 for SDS and Tween 80, respectively.

  19. USO DE BENTONITA EN AGUAS RESIDUALES DE CURTIEMBRES PARA LA REMOCIÓN DE Cr(III

    Directory of Open Access Journals (Sweden)

    Adriana Echavarria Isáza

    2010-10-01

    Full Text Available Se reporta un procedimiento eficiente para la remoción de Cr(lll de las aguas residuales de curtiembres utilizando bentonita natural y químicamente tratada. El mejor resultado se obtiene utilizando 7.5 gramos de bentonita natural para un volumen de efluente residual de 20 mi. Este sólido removió la totalidad del cromo(III presente en la muestra.

  20. Uso de bentonita en aguas residuales de curtiembres para la remoción de cr(iii)

    OpenAIRE

    Echavarria Isáza, Adriana; Moreno Casafús, Mónica; Rámirez Ochoa, Claudia; Tamayo Martinez, Claudia; Saldarriaga Molina, Carlos

    2010-01-01

    Se reporta un procedimiento eficiente para la remoción de Cr(lll) de las aguas residuales de curtiembres utilizando bentonita natural y químicamente tratada. El mejor resultado se obtiene utilizando 7.5 gramos de bentonita natural para un volumen de efluente residual de 20 mi. Este sólido removió la totalidad del cromo(III) presente en la muestra.

  1. Nature as Dissonant Heritage

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2014-01-01

    Many former sites of land reclamation, where rivers and wetlands have been cultivated for the purpose of modern agriculture, are now subject to projects of nature restoration. In this context nature is often referred to as ‘the nature’ or simply ‘nature’ as it was something objective and self......-evident. But who define and decide what kind of nature to restore? And is nature restoration not a contradiction in terms in our deeply cultivated landscapes? To examine these questions it makes sense to draw parallels between nature restoration and the concept of ‘dissonant heritage’ (Ashworth 2010), which...... concerns situations of mismatch between people and their heritage. The aim of the paper is to uncover the latent cultural dissonance in relation to nature restoration and to explain how landscape architecture could play an important role in the management of this dissonance. If one accepts that heritage...

  2. Nature and health.

    Science.gov (United States)

    Hartig, Terry; Mitchell, Richard; de Vries, Sjerp; Frumkin, Howard

    2014-01-01

    Urbanization, resource exploitation, and lifestyle changes have diminished possibilities for human contact with nature in urbanized societies. Concern about the loss has helped motivate research on the health benefits of contact with nature. Reviewing that research here, we focus on nature as represented by aspects of the physical environment relevant to planning, design, and policy measures that serve broad segments of urbanized societies. We discuss difficulties in defining "nature" and reasons for the current expansion of the research field, and we assess available reviews. We then consider research on pathways between nature and health involving air quality, physical activity, social cohesion, and stress reduction. Finally, we discuss methodological issues and priorities for future research. The extant research does describe an array of benefits of contact with nature, and evidence regarding some benefits is strong; however, some findings indicate caution is needed in applying beliefs about those benefits, and substantial gaps in knowledge remain.

  3. Comportamento ingestivo diurno de vacas primíparas em pastagem nativa dominada por capim-annoni-2 com suplementação proteica e mineral em diversas estações climáticas Diurnal ingestive behaviour of pregnant heifers grazing on natural grasslands invaded by Eragrostis plana Ness as affected by protein and mineral supplements in the different climatic seasons

    Directory of Open Access Journals (Sweden)

    Silvane Barcelos Carlotto

    2010-03-01

    Full Text Available Avaliou-se a influência da suplementação proteica e mineral sobre o comportamento ingestivo de vacas primíparas em pastagem nativa dominada por capim-annoni-2 (Eragrostis plana Ness recebendo suplementação com sal comum; sal mineral; sal proteinado; ou sal para reprodução e sal proteinado (1:1. Testou-se a hipótese de que suplementos minerais e proteinados pudessem promover alterações no comportamento ingestivo dos animais em pastejo. O estudo foi desenvolvido em uma área de 37 ha de pastagem nativa invadida por capim-annoni-2, dividida em oito potreiros (unidades experimentais. Os animais foram avaliados no período diurno, por dois dias consecutivos, em cada uma das estações climáticas, de abril de 2006 a março de 2007. O delineamento experimental foi inteiramente casualizado com duas repetições. Os tempos de pastejo, de ruminação, de ócio e de outras atividades não diferiram entre suplementos, e os valores médios diários para essas atividades foram 505, 108, 70 e 11 minutos, respectivamente. Os tempos de pastejo, ruminação e ócio e a taxa de bocados diferiram significativamente entre as estações climáticas. A suplementação proteica e mineral não promove alterações significativas no comportamento ingestivo dos animais. O comportamento ingestivo, no entanto, é influenciado pelas estações climáticas.The influence was assessed of protein and mineral supplementation on the ingestive behavior of pregnant heifers on a native grassland dominated by capim-annoni-2 (Eragrostis plana Ness supplementation with common salt, mineral salt, protein salt and protein salt and reproduction salt (1:1. The hypothesis was tested that different mineral and protein salt supplements could promote alterations in the animal grazing ingestive behavior. The study was carried out in a 37 ha area of native pasture invaded by capim-annoni-2, divided into 8 paddocks (experimental units. The animals were evaluated during the daylight

  4. Natural gas annual 1997

    International Nuclear Information System (INIS)

    1998-10-01

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1997 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. This is followed by tables summarizing natural gas supply and disposition from 1993 to 1997 for each Census Division and each State. Annual historical data are shown at the national level. 27 figs., 109 tabs

  5. The City and Nature

    Directory of Open Access Journals (Sweden)

    Eduard Tovmasyan

    2016-09-01

    Full Text Available Animate “nature–1” around us is transforming into supported or non-supported by man “nature-2” within the framework of the urban development of town areas. Interaction of town and nature is a bilateral process. Experts underline 4 groups of town planning risks related to the interaction of town and nature: ecological, natural and biosphere, sanitary-epidemiologic risks as well as planning and management risks. The latter is often connected with protest population activities. The magazine is looking forward to readers comments.

  6. Natural gas outlook

    International Nuclear Information System (INIS)

    Molyneaux, M.P.

    1998-01-01

    An overview of natural gas markets in Canada and in the United States was provided. The major factors that determine the direction of natural gas prices were depicted graphically. Price volatility has decreased in recent months. As expected, April through November total energy consumption reached historically high levels. Demand for natural gas during the summer of 1997 was not as strong as anticipated. Nuclear energy appears to be on the slippery slope, with natural gas-driven electricity projects to fill the void. Hydroelectricity had a strong showing in 1997. Prospects are less bright for 1998 due to above average temperatures. Canadian natural gas export capacity has increased 5.5 times between 1986 and estimated 1999 levels. Despite this, in 1997, deliveries to the United States were marginally behind expectations. Natural gas consumption, comparative fuel prices, natural gas drilling activity, natural gas storage capacity, actual storage by region, and average weekly spot natural gas prices, for both the U. S. and Canada, were also provided. With regard to Canada, it was suggested that Canadian producers are well positioned for a significant increase in their price realization mostly because of the increase in Canada's export capacity in 1997 (+175 Mmcf/d), 1998 (1,060 Mmcf/d) and potentially in 1999 or 2000, via the Alliance Pipeline project. Nevertheless, with current production projections it appears next to impossible to fill the 10.9 Bcf/d of export capacity that will be potentially in place by the end of 1999. tabs., figs

  7. Nature-based integration

    DEFF Research Database (Denmark)

    Pitkänen, Kati; Oratuomi, Joose; Hellgren, Daniela

    Increased attention to, and careful planning of the integration of migrants into Nordic societies is ever more important. Nature based integration is a new solution to respond to this need. This report presents the results of a Nordic survey and workshop and illustrates current practices of nature...... based integration by case study descriptions from Denmark, Sweden Norway and Finland. Across Nordic countries several practical projects and initiatives have been launched to promote the benefits of nature in integration and there is also growing academic interest in the topic. Nordic countries have...... the potential of becoming real forerunners in nature based integration even at the global scale....

  8. A família como uma realização da eticidade democrática segundo Honneth: para além do modelo androcêntrico e do naturalismo de Hegel = The family as a realization of democratic ethicity according to Honneth: Beyond the androcentric model and the naturalism of Hegel

    Directory of Open Access Journals (Sweden)

    Lima, Francisco Jozivan Guedes de

    2016-01-01

    Full Text Available Este artigo tenciona apresentar a concepção de família como uma esfera da eticidade democrática segundo Axel Honneth, especificamente, a partir da reconstrução socionormativa desenvolvida em Das Recht der Freiheit. Honneth reconstrói como a mulher por meio da inserção no mercado de trabalho conquistou reconhecimento e rompeu com um modelo androcêntrico de divisão das tarefas familiares; analisa a transição do modelo tradicional de família baseado na marginalização da figura feminina para um modelo democrático baseado na parceria e na solidariedade. A reconstrução do modelo normativo de democracia familiar opõe-se à naturalização hegeliana das relações familiares. Honneth entende que a família na sua composição e na sua mudança tem uma base fortemente cultural, de modo que ela pode ser legitimamente composta por casais heterossexuais, homossexuais e por filhos adotivos

  9. Dramatizar: levantarse para jugar, sentarse para escuchar un cuento

    OpenAIRE

    Gorria Serrano, Guillermo

    2015-01-01

    En el presente trabajo abordaremos la educación infantil, de una manera ambiciosa a través del movimiento y de la dramatización. Lo que proponemos es una educación basada en la naturaleza del niño como animal y apoyada con palabras de Rudolf Steiner, basándonos en cómo juegan todos los animales al ser educados, en cómo se imitan los unos a otros, entre mayores y pequeños. Es la base para un modelo pedagógico basado en el juego, el movimiento y la dramatización, para que los niños dejen un bue...

  10. Centro para reuniones, en Karpfenberg, Estiria (Austria

    Directory of Open Access Journals (Sweden)

    Windbrechtinger, W.

    1965-03-01

    Full Text Available The building bas two wings. One of them has two storeys, and a semibasement, and is used as offices. The other wing has a single floor level, and constitutes the Meeting Hall. On entering there is a kind of forecourt, and behind the meeting hall there is a further court, which on special occasions could also be utilized for large meetings. Amusement rooms for television and card and other games are provided in the semibasement: also a photographic laboratory, games stores, washing and boiler room. The ground floor contains the municipal library, a number of offices (an insurance company, the workers' chamber, and the association of nature's friends and rooms for the meetings of political organisations. On the second floor the syndicates have their offices, which include board room, a teaching room, three rooms for guests, the doorman's living quarters, and the necessary services. Finally, the meeting hall section involves a vestibule, the hall itself with accommodation for 300 people, a stage, cafeteria, kitchen, and other auxiliary facilities. The design of this building is rational and straightforward, and is pleasantly in keeping with the surrounding buildings and landscape.El edificio consta de dos alas: una, con dos plantas—destinadas a oficinas—y semisótano; y otra, de una sola planta, en la que está situada la sala de reuniones. Visto el conjunto desde la entrada, aparece una especie de patio delantero, dejando, detrás de la sala, un segundo patio, susceptible de ser utilizado en casos especiales, tales como grandes reuniones, etc. El semisótano agrupa las salas de esparcimiento—juego, televisión, trabajos para entretenimiento—, laboratorio fotográfico y cámara oscura, locales para guardar los utensilios de deporte, aseos, almacén y cuarto de la calefacción. La planta baja contiene la biblioteca municipal, varias oficinas— de una sociedad de seguros, de la cámara de trabajadores, de la asociación de amigos de la

  11. MODELO PARA ESTABLECER SANCIONES PECUNIARIAS PARA DELITOS AMBIENTALES

    Directory of Open Access Journals (Sweden)

    LUIS DIEGO VÉLEZ GÓMEZ

    2012-01-01

    Full Text Available Este artículo pretende exponer el modelo básico que sustenta el desarrollo de multas óptimas; en él se muestra la forma de desincentivar los intereses del violador de la normatividad ambiental, e igualmente el método para alcanzar efectos compensatorios sobre los daños cometidos al medio ambiente. El desarrollo del tema sobre sanciones pecuniarias (multas y penalidades (encarcelamiento toma la relación contractual entre el agente (la empresa y el principal (La entidad reguladora para, a través de esta relación, entrar en la determinación de un diseño eficaz de sanciones. Se utilizara el modelo de agente-principal para examinar los efectos de las sanciones corporativas e individuales sobre los incentivos de cumplimiento en el contexto ambiental; además se emplearán los conceptos de bienes públicos, bienes comunes y externalidades como categorías de análisis que permiten la identificación y valoración de daños ambientales.

  12. MODELO PARA LA CREACIÓN DEL CONOCIMIENTO PARA PYMES

    Directory of Open Access Journals (Sweden)

    Marino Valencia Rodríguez

    2009-01-01

    Full Text Available La creciente importancia del conocimiento, como nuevo factor de producción, hace que la creación y transferencia se convierta en una de las principales prioridades de las organizaciones. El presente artículo describe tanto los fundamentos de la teoría de los recursos y capacidades de la empresa como el enfoque de la gestión del conocimiento, con sus procesos de generación y transferencia del conocimiento. Estos sirven de guía básica teórica para alcanzar el siguiente objetivo: Diseñar un modelo de generación y transferencia de conocimiento para los procesos de dirección, gestión humana y del conocimiento para PyMES, con el fin de que éstas alcancen mayores niveles de competitividad. El modelo se diseña, a partir del direccionamiento estratégico de la organización. Está conformado por tres etapas, articuladas con elementos y actividades. Las acciones se enfocan en dos factores clave de éxito: la cultura organizacional y la formación. La utilización del modelo permitirá a las PyMES optimizar los recursos y capacidades disponibles, lo cual se refleja en el desempeño del trabajador y en el fortalecimiento de la cultura organizacional.

  13. Mimesis e rememoração da natureza no sujeito em Theodor W. Adorno: para pensar a educação do corpo na escola Mimesis and remembrance of nature in the subject by Theodor W. Adorno: thinking body education at school

    Directory of Open Access Journals (Sweden)

    Jaison José Bassani

    2011-04-01

    Full Text Available A partir das contribuições da Teoria Crítica da Sociedade, de Theodor W. Adorno, o presente trabalho dedica-se a uma reflexão epistemológica e pedagógica sobre o tema do corpo e suas expressões, em especial no que se refere a dois de seus motivos originais: a questão da mimesis e a da rememoração da natureza no sujeito. Como resultado, destaca-se a posição dialética que o corpo ocupa no processo de esquecimento e denegação da natureza no sujeito, na medida em que, se a ideia de natureza e da memória do sujeito em relação a ela é expressão de uma subjetividade incerta e petrificada, por outro lado, no entanto, a partir da valorização do comportamento mimético no âmbito das práticas corporais, constitui-se a possibilidade de resistência aos imperativos da racionalidade instrumental.Based on the contributions from the Critical Theory of Society of Theodor W. Adorno, this paper makes an epistemological and pedagogical reflection on body and its expressions, specially on two original forces: mimesis and remembrance of nature in the subject. The body finds a dialectical place in the process of forgetting and refusing nature in the subject. If nature and the subject's memory are an expression of an uncertain and stoned subjectivity, mimetic behavior in corporal practices is however a possibility or resistance against instrumental rationality.

  14. Early modern natural history

    Indian Academy of Sciences (India)

    Early modern natural history: Contributions from the Americas and India. Rajesh Kochhar. Perspectives Volume 37 Issue ... Keywords. India; medical botany; natural history; scientific botany; the Americas. Author Affiliations. Rajesh Kochhar1. Indian Institute of Science Education and Research, Mohali 140 306 Punjab, India ...

  15. Nature Foil Reliefs

    Science.gov (United States)

    Lane, Shaw J.

    2012-01-01

    Nature has always been a source of inspiration for artists across the centuries. Artists such as Leonardo da Vinci, Georgia O'Keeffe, Ansel Adams, and Andy Goldsworthy all drew inspiration for their work from nature. Seeds come from the dried pods, which when planted and cared for, bear fruit. In this article, the author describes how her…

  16. SUIKERBOSRAND NATURE RESERVE

    African Journals Online (AJOL)

    Suikerbosrand Nature Reserve and fts educational facilities are run by the Transvaal. Division of. Nature Conservation. ... tion and the education facilities provided. The former are utilized mainly by the general public ... artist Paul Bosman (already reviewed in the EEASA newsletter). The co-founders of the Foundation are.

  17. European natural gas

    International Nuclear Information System (INIS)

    Thackeray, Fred

    1999-11-01

    Contains Executive Summary and Chapters on: Main issues; Natural gas consumption and supply: statistics and key features of individual countries; Sectoral natural gas consumption; Indigenous production; Imports; Prices and taxes; The spot market: The interconnector; Forecasts of production and consumption and contracted imports; Progress of markets liberalisation; Effects of environmentalist developments; Transmission networks and storage; Some principal players. (Author)

  18. Natural Ventilation in Atria

    DEFF Research Database (Denmark)

    Svidt, Kjeld; Heiselberg, Per; Hendriksen, Ole Juhl

    This case study comprises a monitoring programme as well as a Computational Fluid Dynamics (CFD) analysis of a natural ventilated atrium. The purpose has been to analyse the performance of a typical natural ventilation system in Denmark under both summer and winter conditions....

  19. Nature and landscape protection

    International Nuclear Information System (INIS)

    Klinda, J.; Lieskovska, Z.

    1998-01-01

    In accordance with National Council of the Slovak Republic Act N. 287/1994 Coll. on Nature and Landscape Protection, the system of complex nature landscape protection has been designed based on five levels of protection. Categories of protected areas as well as cultural monuments in the Slovak Republic are reviewed.Slovak contribution to the world heritage is included

  20. Exposure to natural radiation

    International Nuclear Information System (INIS)

    Green, B.M.R.

    1985-01-01

    A brief report is given of a seminar on the exposure to enhanced natural radiation and its regulatory implications held in 1985 at Maastricht, the Netherlands. The themes of the working sessions included sources of enhanced natural radiation, parameters influencing human exposure, measurement and survey programmes, technical countermeasures, risk and assessment studies, philosophies of dose limitations and national and international policies. (U.K.)

  1. Chemistry of Natural Dyes

    Indian Academy of Sciences (India)

    The sulfonated oils, which possess better metal bind- ing capacity than the natural oils due to the presence of sulfonic acid group, bind to metal ions forming a complex with the dye to give superior fastness and hue. Limitations of Natural Dyes. Tedious extraction of colouring component from the raw mate- rial, low colour ...

  2. Archives: Sciences & Nature

    African Journals Online (AJOL)

    Items 1 - 9 of 9 ... Archives: Sciences & Nature. Journal Home > Archives: Sciences & Nature. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register · Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives. 1 - 9 of 9 Items. 2011. Vol 8, No 1-2 ...

  3. Modeling Natural Selection

    Science.gov (United States)

    Bogiages, Christopher A.; Lotter, Christine

    2011-01-01

    In their research, scientists generate, test, and modify scientific models. These models can be shared with others and demonstrate a scientist's understanding of how the natural world works. Similarly, students can generate and modify models to gain a better understanding of the content, process, and nature of science (Kenyon, Schwarz, and Hug…

  4. Nature as Measure

    DEFF Research Database (Denmark)

    Peters, Terri

    2011-01-01

    The potential for biomimicry lies far beyond the direct imitation of natural forms. Guest-editor Terri Peters describes how Janine Benyus, the biologist and innovation consultant, is using biomimicry to create performance metrics from natural technologies and processes for assessing aspects...

  5. Validação de métodos cromatográficos por clae para análise das vitaminas B1, B2, B6 e niacina naturalmente presentes em farinha de cereais Validation of hplc methods for analysis of vitamins B1, B2, B6 and niacin naturally present in cereal flours

    Directory of Open Access Journals (Sweden)

    Ana Elisa Ferreira Presoto

    2008-01-01

    Full Text Available Complex B vitamins are present in some cereal foods and the ingestion of enriched products contributes to the recommended dietary intake of these micronutrients. To adapt the label of some products, it is necessary to develop and validate the analytical methods. These methods must be reliable and with enough sensitivity to analyze complex B vitamins naturally present in food at low concentration. The purpose of this work is to evaluate, with validated methods, the content of vitamins B1, B2, B6 and niacin in five cereal flours used in food industry (oat, rice, barley, corn and wheat.

  6. Revenge of Mother Nature

    DEFF Research Database (Denmark)

    Hansen, Kim Toft

    2018-01-01

    by employing the well-known mythical trope of the forest. This specific attention towards nature, the forest and the Swedish landscape not only establishes a supernatural sense of place and nature. While creating a generic hybrid between crime fiction and tropes and motifs from the horror genre and what has...... been dubbed ecohorror (Murray & Heumann 2016; Crosby 2014), the supernaturalisation of the landscape in both series establishes an ecocriti-cal consideration of retaliating nature reacting against human interference with nature. The visual etymology of such place sensibilities reaches back in Nordic...... landscape iconography with an obvious relationship with the notion of the Nordic sublime in romantic landscape painting (Alsen & Landmann 2016). These dramas address nature and ecocritical issues by way of a supernature with agency....

  7. Nature teaching structures

    DEFF Research Database (Denmark)

    Wester, Ture

    2002-01-01

    -living nature a number of striking statical and kinematical peculiarities have been observed. The paper will try to isolate and describe some of these observations and their relation to our engineered structures based on human thinking. The paper will deal with basic aspects as geometry, topology, redundancy...... and rare piece of fine architecture - or a common organism in Nature. That is why Nature makes an excellent object for architectural students to study structures from a conceptual and a morphological point of view. And that is why Nature - who has developed her structural systems by trial-and-error through...... millions of years - acts as an excellent teacher of these topics. At the same time, the idiom of Nature seems to possess a considerable attraction for students and is able to convey inspiration and imagination to the creative process of shaping architectural structures. In our surrounding living and non...

  8. Unnaturalised racial naturalism.

    Science.gov (United States)

    Hochman, Adam

    2014-06-01

    Quayshawn Spencer (2014) misunderstands my treatment of racial naturalism. I argued that racial naturalism must entail a strong claim, such as "races are subspecies", if it is to be a substantive position that contrasts with anti-realism about biological race. My recognition that not all race naturalists make such a strong claim is evident throughout the article Spencer reviews (Hochman, 2013a). Spencer seems to agree with me that there are no human subspecies, and he endorses a weaker form of racial naturalism. However, he supports his preferred version of 'racial naturalism' with arguments that are not well described as 'naturalistic'. I argue that Spencer offers us an unnaturalised racial naturalism. Copyright © 2014 Elsevier Ltd. All rights reserved.

  9. Use of compressed natural gas in automotive vehicles; Uso del gas natural comprimido aplicado en vehiculos automotores

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez R, Adrian [Comision Nacional para el Ahorro de Energia (CONAE) (Mexico)

    2005-07-01

    The natural gas is natural origin energy (fossil fuel); it contains predominantly 90 percent methane; does not require transformation process for its use; is supplied the 24 hours to commerce, industries and homes by underground pipes; it is lighter than air; it is not corrosive, nor absorbent or toxic. For those reasons a study was performed where it is widely justified why the natural gas ought to be used in vehicles. [Spanish] El gas natural es un energetico de origen natural (combustible fosil), contiene predominantemente 90 por ciento de metano, no requiere proceso de transformacion para su utilizacion, llega directamente las 24 horas del dia a los hogares, comercios e industrias por tuberias subterraneas, es mas ligero que el aire, no es corrosivo, no es absorbente y no es toxico. Por esas razones se hizo un estudio donde se justifica ampliamente porque el gas natural debe utilizarse en vehiculos.

  10. Preliminary technical and economic viability for the implantation of fluvial transport of CNG (Compressed Natural Gas) for barges in Amazon Region; Avaliacao preliminar de viabilidade tecnico-economica para implantacao de transporte fluvial de GNC (Gas Natual Comprimido) por barcacas na Regiao Amazonica

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Marcos C.C. de; Porto, Paulo L. Lemgruber [Interocean Engenharia e Ship Management, Rio de janeiro, RJ (Brazil); Cunha, Rafael H. da [Metro Rio, RJ (Brazil); Garcia, Rafael M. [Pic Brasil (Brazil); Almeida, Marco A.R. de [Universidade Gama Filho (UGF), Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The isolated regions of the Amazon present difficulties for integration with the electrical system which is creating some economic problems due to the consequent costs of electric generation of subsidies as a function of the fossil fuel use as oils diesel and fuel. A viable option is the use of Natural Gas - NG that is Also available in the region. Its modal of transport possible in the Region North they are for gas-lines or barges. The Compressed Natural Gas transport is distinguished that - CNG for barges was still not tested operationally in Brazil. Soon, to develop a Preliminary Study of Viability Technician - Economic - SVTE for the implantation of fluvial transport of CNG between the cities of Coari and Manaus is basic, therefore it is created strategical alternative for the electric generation in this region. The electric sector, the characteristics of the NG and the transport in this region had been analyzed to support to the work. The gas line and the fluvial transport of CNG for barges in this region are not conflicting, and they in a complementary form can act. The SVTE presented a Liquid Present Value and Internal Tax of very attractive Return justifying its implantation. (author)

  11. FRANQUICIAS. Una Alternativa para Emprendedores

    Directory of Open Access Journals (Sweden)

    Jorge Enrique Silva Duarte

    2003-07-01

    Full Text Available Este artículo presenta las ventajas de las franquicias como alternativa de negocios. Para un emprendedor exitoso ya establecido es más rentable permitir el uso de su conocimiento explícito mediante el formato de negocio de su firma y recibir regalías mensuales sobre las ventas brutas, que invertir en la apertura de cada nuevo punto. Igualmente, para quien desee iniciarse como empresario, la modalidad de franquicia es muy interesante: en primer lugar, porque empieza con un negocio ya probado, utiliza la imagen extendida de la franquicia y recibe un apoyo corporativo del franquiciador; adicionalmente, detrás del formato de negocio que contrata, está el capital relacional, en otras palabras, la experticia del franquiciador, el conocimiento del mercado, la base de clientes y de proveedores y el capital humano.

  12. Projections of demand of natural gas in Mexico; Proyecciones de demanda de gas natural en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Quintanilla Martinez, Juan [Programa Universitario de Energia, UNAM (Mexico)

    1996-07-01

    The projections of demand of energy for Mexico, in the global and regional scope, for period 1992-2020 are presented. The projections are based on the use of a simulation model built in the University Program of Energy of the Universidad Nacional Autonoma de Mexico (UNAM), which allows to project the demand in the short and medium term of the primary and final energy. Projections of the demands of energy or for fuels by sectors and subsectors are obtained in accordance with different scenarios of growth. Particularly the demand of natural gas is analyzed, both, as energy and as raw material for the petrochemical industry, and as fuel oil, under different scenarios of economic growth and policies of environmental character. [Spanish] Se presentan las proyecciones de demanda de energia para Mexico, en el ambito global y regional, para el periodo 1992-2020. Las proyecciones estan basadas en el uso de un modelo de simulacion construido en el Programa Universitario de Energia de la Universidad Nacional Autonoma de Mexico (UNAM), el cual permite proyectar la demanda de energia primaria y final en el corto y mediano plazos. Se obtienen proyecciones de las demandas de energia por sectores y subsectores o por combustibles de acuerdo con diferentes escenarios de crecimiento. En particular se analiza la demanda de gas natural, tanto como energetico como materia prima para la petroquimica, y combustoleo bajo diferentes escenarios de crecimiento economico y politicas de caracter ambiental.

  13. Encuestas para llegar al poder

    Directory of Open Access Journals (Sweden)

    Luis Eladio Proaño

    2015-01-01

    Full Text Available Las encuestas son parte fundamental de los procesos políticos. Pero en América Latina apenas se utilizan. Además, la mayoría de la población las considera sospechosas. Un director de campaña moderno, necesita datos precisos para que su candidato tenga posibilidades ciertas de ganar. Con las encuestas sí se puede.

  14. Argumentos para repensar el "desarrollo"

    Directory of Open Access Journals (Sweden)

    María Luisa Eschenhagen

    2001-06-01

    Full Text Available Con este trabajo se quiere hacer una aproximación al problema desde una perspectiva diferente, considerando nuevos argumentos que hasta hace muy poco tiempo no se habían tenido en cuenta y que se vienen formulando de una manera muy interesante en los últimos años. El objetivo del artículo es presentar tres argumentos para señalar la necesidad de repensar, desde sus fundamentos, el concepto de desarrollo.

  15. Diagramas de Bianchi para Susy

    Directory of Open Access Journals (Sweden)

    Sara Cruz y Cruz

    2006-01-01

    Full Text Available Se revisa el origen de los solitones como soluciones de la ecuación de Korteweg-de Vries y su presencia en la formulación supersimétrica de la Mecánica Cuántica. Se introducen los diagramas de Bianchi como una herramienta simbólica para construir socios supersimétricos de un Hamiltoniano dado.

  16. Financiamiento para construir la finca.

    Directory of Open Access Journals (Sweden)

    Túpac Barahona.

    1998-08-01

    Full Text Available Las instituciones financieras convencionales y no convencionales tienden a excluir de los servicios de crédito a los sectores más frágiles del campesinado, por considerarlos clientes altamente riesgosos. En este artículo, se discute el sentido económico y social que tendrían que desarrollar esquemas de financiamiento para campesinos con economías débiles, pero con un potencial de desarrollo latente.

  17. Modelo de agente inteligente para interpretar el lenguaje de sellas argentino

    OpenAIRE

    Recabarren, Armando Alberto

    1999-01-01

    Se presentan las consideraciones que llevaron a la propuesta y las primeras investigaciones para el desarrollo de un agente inteligente que pennita la interpretación del Lenguaje de Señas. La comunidad sorda ha desarrollado un lenguaje de señas que esta reconocido como un lenguaje natural por la comunidad científica. Como tal admite ser tratado con las mismas herramientas disponibles para cualquier lenguaje natural, sin embargo el hecho de ser fundamentalmente gesto-visual requiere de proceso...

  18. requisito para pensar la paz

    Directory of Open Access Journals (Sweden)

    Jaidivi Núñez Varón

    2006-01-01

    Full Text Available Este documento señala puntos de discusión para reflexionar sobre cómo la justicia basada en la construcción social tiene la posibilidad de convertirse en un requisito para pensar la paz. El análisis inicia desde algunos horizontes planteados por la sociología jurídica, la antropología jurídica, la psicología social y el derecho. El objetivo es permitir que el lector tenga preguntas que contribuyan para pensar la paz en un país que tiene la coyuntura del conflicto armado y que cuestiona la justicia desde el escalamiento de la violencia en el espacio cotidiano. Se señalan algunos puntos de la relación entre la justicia y la paz desde la construcción del Estado, identificando los momentos y características de la conexión de estos dos conceptos en el curso de los acontecimientos históricos. Se presenta la concepción de la justicia a través de la óptica del pensamiento complejo y se plantea una discusión de cómo pensar la paz desde la construcción social.

  19. Estrategia para la sustentabilidad ambiental

    Directory of Open Access Journals (Sweden)

    Cecilia Erbiti

    2006-01-01

    Full Text Available En el contexto de los postulados conceptuales y metodológicos de la planificación estratégica y de sustentabilidad ambiental, el objetivo de esta investigación es describir el proceso de formulación del Plan de Ordenamiento Territorial del Municipio de Tandil (POTM y analizar su potencialidad para avanzar hacia la sustentabilidad ambiental del sistema. Los resultados de la misma muestran que el POTM no sólo prioriza principios, objetivos y estrategias que materializan las diferentes manifestaciones de la sustentabilidad (económica, social, ecológica y política, sino que la totalidad del Plan se fundamenta en el concepto de desarrollo sostenible y, con ello, se establecen prioridades de actuación que posibilitarán la gestión ambiental urbana. Si bien el POTM muestra una gran potencialidad para avanzar hacia la sustentabilidad del territorio, la implementación y cumplimiento del mismo constituye un fuerte desafío para las autoridades de aplicación.

  20. para asegurar un hijo sano

    Directory of Open Access Journals (Sweden)

    Carmen Amarilis Guerra de Castillo

    2006-01-01

    Full Text Available Esta investigación etnográfica focalizada exploró las creencias, los valores, los hábitos y los padrones comportamentales de las embarazadas diabéticas atendidas en el Hospital Doctor Enrique Tejera, quienes residen en tres comunidades urbanas pobres de la ciudad de Valencia - Venezuela, con el objetivo de encontrar el significado del cuidado de si para dichas grávidas. Se utilizó como referencial teórico el Modelo del Análisis de la Salud y la Teoría Antropológica de la Salud, siendo fundamentales para revelar aquello que estaba implícito en el comportamiento de las mujeres con relación a su cuidado. Surgieron tres temas: la salud y la enfermedad - valores culturales del cuidado de si; las prácticas del cuidado de la salud y cuidándose en el embarazo garantiza tener un hijo más saludable. Los temas culturales revelaron que las creencias, los valores, los hábitos y los patrones culturales comportamentales, conforme las tres maneras de acción identificadas, pueden ser preservadas, acomodadas y re-estructuradas para proporcionar un cuidado culturalmente congruente.

  1. Almacenamiento de gas natural

    Directory of Open Access Journals (Sweden)

    Tomás Correa

    2008-12-01

    Full Text Available The largest reserves of natural gas worldwide are found in regions far of main cities, being necessary different alternatives to transport the fluid to the consumption cities, such as pipelines, CNG or ships, LNG, depending on distances between producing regions and demanding regions and the producing volumes. Consumption regions have three different markets to naturalgas; residential and commercial, industrial and power generation sector. The residential and commercial is highly seasonal and power generation sector is quite variable depending on increases of temperature during summer time. There are also external issuesthat affect the normal gas flow such as fails on the national system or unexpected interruptions on it, what imply that companies which distribute natural gas should design plans that allow supplying the requirements above mentioned. One plan is using underground natural gas storage with capacities and deliverability rates enough to supply demands. In Colombia there are no laws in this sense but it could be an exploration to discuss different ways to store gas either way as underground natural gas storage or above superficies. Existing basically three different types of underground natural gas storage; depleted reservoirs, salt caverns and aquifers. All ofthem are adequate according to geological characteristics and the needs of the distributors companies of natural gas. This paper is anexploration of technical and economical characteristics of different kind of storages used to store natural gas worldwide.

  2. Natural gas in Mexico

    International Nuclear Information System (INIS)

    Ramirez, M.

    1999-01-01

    A series of overhead viewgraphs accompanied this presentation which focused on various aspects of the natural gas industry in Mexico. Some of the viewgraphs depicted statistics from 1998 regarding natural gas throughput from various companies in North America, natural gas reserves around the world, and natural gas reserves in Mexico. Other viewgraphs depicted associated and non-associated natural gas production from 1988 to 1998 in million cubic feet per day. The Burgos Basin and the Cantarell Basin gas production from 1997 to 2004 was also depicted. Other viewgraphs were entitled: (1) gas processing infrastructure for 1999, (2) cryogenic plant at Cd. PEMEX, (3) average annual growth of dry natural gas production for 1997-2004 is estimated at 5.2 per cent, (4) gas flows for December 1998, (5) PGPB- interconnect points, (6) U.S. Mexico gas trade for 1994-1998, (7) PGPB's interconnect projects with U.S., and (8) natural gas storage areas. Technological innovations in the industry include more efficient gas turbines which allow for cogeneration, heat recovery steam generators which reduce pollutant emissions by 21 per cent, cold boxes which increase heat transfer efficiency, and lateral reboilers which reduce energy consumption and total costs. A pie chart depicting natural gas demand by sector shows that natural gas for power generation will increase from 16 per cent in 1997 to 31 per cent in 2004. The opportunities for cogeneration projects were also reviewed. The Comision Federal de Electricidad and independent power producers represent the largest opportunity. The 1997-2001 investment program proposes an 85 per cent sulphur dioxide emission reduction compared to 1997 levels. This presentation also noted that during the 1998-2001 period, total ethane production will grow by 58 tbd. 31 figs

  3. Application of natural Ra isotopes and {sup 234}Th as tracers of organic carbon export in Bransfield Strait, Antarctica; Aplicacao dos isotopos naturais de Ra e do Th-234 como tracadores do carbono organico exportado para o Estreito de Bransfield, Antartica

    Energy Technology Data Exchange (ETDEWEB)

    Vieira, Lucia Helena

    2011-07-01

    The Southern Ocean is the largest of several high-nutrient, low-chlorophyll (HNLC) regions in the world's oceans. This region plays a major role in regulating the global net transfer of carbon dioxide between the ocean and the atmosphere, in part because the annual photosynthetic uptake of CO{sub 2} by phytoplankton and resulting export of particulate organic carbon (POC) to the deep ocean. The element thorium has multiple radioisotopes that have emerged collectively as a powerful set of tracers for particle associated processes in the oceans. Of all the Th isotopes, {sup 234}Th (half-life 24.1 d) has been the focus of increasing attention and application in the past years. The production of {sup 234}Th from {sup 238}U, coupled with the conservative behavior of {sup 238}U in seawater, makes the source of {sup 234}Th easy to characterize. Moreover, the half-life of {sup 234}Th is sufficiently short to make it sensitive to the short-term (e.g. seasonal) changes that occur in the upper water column of the open ocean or in sediments or water column in coastal areas. Because of its very particle reactive behavior, {sup 234}Th is removed from a parcel of water in only two ways, through decay and through particle flux. Therefore, a steady-state 1D activity balance can be used to calculate its flux. Natural Ra isotopes have been also widely used in marine studies to trace water masses and to quantify mixing processes. This work presents results of a collaborative research on organic carbon fluxes distribution in the Bransfield Strait in order to evaluate its influence in the CO{sub 2} drawdown. Macro-nutrients, micro-nutrients and chlorophyll-a distributions were used to examine the pathway sources. Natural radium isotopes were applied as tracers to study the movement of shelf water, while {sup 234}Th was used as a tracer of particle flux in the upper ocean, since POC export via sinking particles is the primary mechanism of carbon sequestration in the Southern Ocean

  4. Living in cities, naturally.

    Science.gov (United States)

    Hartig, Terry; Kahn, Peter H

    2016-05-20

    Natural features, settings, and processes in urban areas can help to reduce stress associated with urban life. In this and other ways, public health benefits from, street trees, green roofs, community gardens, parks and open spaces, and extensive connective pathways for walking and biking. Such urban design provisions can also yield ecological benefits, not only directly but also through the role they play in shaping attitudes toward the environment and environmental protection. Knowledge of the psychological benefits of nature experience supports efforts to better integrate nature into the architecture, infrastructure, and public spaces of urban areas. Copyright © 2016, American Association for the Advancement of Science.

  5. EEC's: natural uramium supplies

    International Nuclear Information System (INIS)

    Anon.

    1981-01-01

    The demand for nuclear fuel to supply the nuclear plants within the ECC (31,200 MW at the end of last year) totalled nearly 9,600 tons of natural uranium and 4,900 of separation work units (SWU). Once reactors currently under construction come into service, the demand for natural uranium will reach 13,200 tons by 1985 and that for SWUs to 8,600. If one takes the years 1981 to 1985, total natural uranium needs during this period will be 56,300 tons and those for SWUs 35.100 [fr

  6. Closer to Nature?

    DEFF Research Database (Denmark)

    Borkfelt, Sune; Kondrup, Sara; Röcklinsberg, Helena

    2015-01-01

    discourses in order to sell one image of animal welfare in intensive animal production while the actual production at the same time presupposes a quite different paradigm of animal welfare. Specifically, product advertising utilizes representations tied to concepts of naturalness in depictions of both animal...... lives and product processes as “natural”. Product marketing suggests a coherence between nature, production process (farm, animal), and end product, thereby creating associations that the lives of production animals are lived in nature and that their products bring a wholesome and sustainable...

  7. Structural patterns in nature

    DEFF Research Database (Denmark)

    Wester, Ture

    2003-01-01

    It seemens that some very basic randomly produced geometric/topological patterns are commonly found in Nature and have often very distinctive structural qualities. In Nature we find the same pattern in all scales from the universe to molecules, from solar systems to packing of cells, from glaciers...... to sea shells, from river systems to trees etc. Sometimes this seeming archetypical morphology involve structrual action and sometimes not-but the fact that it often posses efficient structural action opens a tool for evaluation and analysis of structures in nature and at the same time might...

  8. Structural patterns in nature

    DEFF Research Database (Denmark)

    Wester, Ture

    2004-01-01

    It seems that some very basic randomly produced geometric/topological patterns are commonly found in Nature and have often very distinctive structural qualities. In nature we find the same pattern in all scales from the universe to molecules, from solar systems to packing of cells, from glaciers...... to sea shells, from river systems to trees etc. Sometimes this seeming archetypical morphology involve structural action and sometimes not - but the fact that it often posses efficient structural action opens a tool for evaluation and analyses of structures in nature and at the same time might...

  9. The unnatural racial naturalism.

    Science.gov (United States)

    Spencer, Quayshawn

    2014-06-01

    In the recent article, "Against the New Racial Naturalism", Adam Hochman (2013, p. 332) argues that new racial naturalists have been too hasty in their racial interpretation of genetic clustering results of human populations. While Hochman makes a number of good points, the purpose of this paper is to show that Hochman's attack on new racial naturalists is misguided due to his definition of 'racial naturalism'. Thus, I will show that Hochman's critique is merely a consequence of an unnatural interpretation of racial naturalism. Copyright © 2014 Elsevier Ltd. All rights reserved.

  10. Nueva Sede para la Academia

    Directory of Open Access Journals (Sweden)

    Mario Camacho Pinto

    1994-06-01

    Full Text Available

    Una nueva sede adecuadamente dotada siempre estuvo en la mente de nuestros expresidentes Académicos César Augusto Pantoja, Hernando Groot, Pablo Gómez Martínez, Jorge Cavelier Gaviria y Efraim Otero-Ruiz, con quienes me tocó en suerte trabajar 12 años consecutivos, cerca de ellos a través de mi cargo de Coordinardor de la Comisión Permanente de Biblioteca y Publicaciones y de la Revista MEDICINA que se ha venido publicando sin interrupciones dentro de un compañerismo ejemplar; además de otras distinciones operativas que me inducen a expresar gratitud.

    Ahora, además, como Secretario de la Coporación por elección unánime de la Asamblea hace dos años, he sido testigo ático de una intensa, inteligente e inagotable actividad que nuestro Presidente Académico Juan Jacobo Muñoz Delgado quien siempre con el visto bueno de la Junta Directiva, mediante un acelerado ritmo de trabajo se impuso la tarea de convertir en realidad inmediata tan anhelada y necesaria idea.

    En efecto, la nueva sede fue inaugurada oficialmente el día 2 de septiembre de 1993.

    Este Editorial es la constancia escrita de tal febril actividad que para proporcionar evidencia a los lectores de “MEDICINA” resumo en breves incisos que muestran el tránsito a un estado con superávit de excepción para esta clase de instituciones:

    1. Terminación de la obra ya iniciada de la remodelación arquitectónica, tanto exterior de seguridad y aspecto como interior con suficientes y modernas instalaciones.

    2. Cerramiento total con altas y elegantes rejas metálicas y doble portería por la calle 69 y la carrera 7a.

    3. Aparcadero lujosamente adoquinado, amplio y seguro para 30 automóviles.

    4. Decoración interior estéticamente consultada, bien lograda en cortinas y clásicas lámparas de cristal obsequiadas por conocidos académicos. Un par de originales urnas precolombianas en el hall de entrada.

    5. Zona social doble, amplia

  11. The mechanization of natural philosophy

    CERN Document Server

    Garber, Daniel

    2014-01-01

    This book reviews the transformation of natural philosophy in the 16th and 17th centuries: description of nature in mathematical terms; comparison of natural phenomena to existing or imaginary machines and the use of mechanical analogies in natural philosophy.

  12. Coleção de microalgas de ambientes dulciaquícolas naturais da Bahia, Brasil, como potencial fonte para a produção de biocombustíveis: uma abordagem taxonômica Collection of microalgae from natural freshwater environments of Bahia, Brazil, as a potential source for biofuel production: a taxonomic approach

    Directory of Open Access Journals (Sweden)

    Maria Cristina de Queiroz Mendes

    2012-09-01

    Full Text Available O presente trabalho envolveu a identificação taxonômica de espécies nativas de microalgas (isoladas de ecossistemas dulciaquícolas localizados nos arredores de Salvador, Bahia integrantes da Coleção de Microalgas dulciaquícolas do LABIOMAR/IB/UFBA, visando estudos taxonômicos mais aprofundados (ultraestruturais e moleculares e experimentos que possam avaliar sua capacidade para suprir cadeias produtivas de biocombustíveis. As coletas foram realizadas nos arredores de Salvador, Bahia, Brasil. A identificação das espécies foi efetuada com base em caracteres morfológicos. Foram identificados 19 táxons, 12 em nível de espécie e nove em nível de gênero, sendo 14 Chlorophyceae (Chlamydomonas sp1, Chlamydomonas sp2, Chlamydomonas sp3, Chlamydocapsa bacillus (Teiling Fott, Chlorococcum sp1, Chlorococcum sp2, Coelastrum indicum Turn.. Coelastrum microporum Nägeli, Desmodesmus brasiliensis (Bohl. Hegew, Scenedesmum obliquus (Turpin Kütz, Ankistrodesmus falcatus (Corda Ralfs, Ankistrodesmus fusiformis Corda, Kirchneriella lunaris (Kirchner. Möbius, Pseudokirchneriella subcapitata (Korshikov F. Hindák, três Trebouxiophyceae (Botryococcus braunii Kütz., Botryococcus terribilis Komárek et Marvan e Chlorella vulgaris Beijerinck, uma Bacillariophyceae (Nitzschia sp. e uma Cyanobacteria (Synechocystis sp..This study identified native species of microalgae (maintained at LABIOMAR/IB/UFBA Collection of Freshwater Microalgae to indicate their potential to supply the biofuel production chain. Samples were collected in freshwater ecosystems around Salvador, Bahia, Brazil. Species identification was based in morphological characteristics. Nineteen species were isolated and identified, 12 at the level of species and nine at the level of genus: 14 Chlorophyceae (Chlamydomonas sp1, Chlamydomonas sp2, Chlamydomonas sp3, Chlamydocapsa bacillus (Teiling Fott, Chlorococcum sp1, Chlorococcum sp2, Coelastrum indicum Turn. Coelastrum microporum N

  13. Microquimerismo natural ¿Existen humanos con varios genomas?

    OpenAIRE

    José Luis Quirós Alpízar; Isabel Cristina Arce Jiménez

    2010-01-01

    El microquimerismo humano se define como la presencia dentro de un individuo de una pequeña población de células originadas en un individuo genéticamente distinto. El microquimerismo adquirido de forma natural se desarrolla a lo largo del embarazo, como una consecuencia del ampliamente demostrado tráfico bidireccional transplacentario de células. Esta trasferencia resulta en un estado microquimérico a décadas posparto, tanto para la madre (microquimerismo fetal) como para su progenie (microqu...

  14. Erodibilidade de um Cambissolo Húmico sob chuva natural

    OpenAIRE

    Schick,Jefferson; Bertol,Ildegardis; Cogo,Neroli Pedro; González,Antonio Paz

    2014-01-01

    A estimativa de perdas de solo é fundamental para o planejamento conservacionista. Com essa finalidade, destaca-se no Brasil o uso da Equação Universal de Perdas de Solo (USLE), para cuja utilização há escassez de dados obtidos de acordo com o método-padrão desse modelo. Entre os fatores que compõem a USLE, a erodibilidade do solo (fator K) é de difícil obtenção em razão da necessidade de conduzir experimentos em campo por longo tempo sob chuva natural. Com o objetivo de quantificar a erodibi...

  15. Natural Gas Acquisition Program

    Data.gov (United States)

    General Services Administration — The "NGAP" system is a web based application which serves NGAP GSA users for tracking information details for various natural gas supply chain elements like Agency,...

  16. Vermont Designated Natural Areas

    Data.gov (United States)

    Vermont Center for Geographic Information — Under Natural Areas Law (10 Vermont Statutes Annotated, Chapter 83 � 2607) the FPR commissioner, with the approval of the governor, may designate and set aside areas...

  17. Biomimetics: nature based innovation

    National Research Council Canada - National Science Library

    Bar-Cohen, Yoseph

    2012-01-01

    "Based on the concept that nature offers numerous sources of inspiration for inventions related to mechanisms, materials, processes, and algorithms, this book covers the topic of biomimetics and the inspired innovation...

  18. Natural radioactive phon

    International Nuclear Information System (INIS)

    Birjukovs, V.; Birjukov, P.

    2004-01-01

    The natural radiating phon is determined by radioactive isotopes of elements which time of half-decay is commensurable in due course existence of the Earth, dispersing in rocks, ground, water and air, and also space radiation. (authors)

  19. Natural gas for vehicles

    International Nuclear Information System (INIS)

    Chauveron, S. de

    1996-01-01

    This article presents compressed natural gas for vehicles (CNG), which can provide considerable advantages both as an alternative fuel and as a clean fuel. These assets are not only economic but also technical. The first part deals with what is at stake in developing natural gas as a motor fuel. The first countries to use CNG were those with natural gas resources in their subsoil. Today, with a large number of countries having to cope with growing concern about increasing urban pollution, natural gas is also seen as a clean fuel that can help cut vehicle pollutant emissions dramatically. In the second part a brief technical descriptions is given of CNG stations and vehicles, with the aim of acquainting the reader with some of CNG's specific technical features as compared to gasoline and diesel oil. Here CNG technologies are seen to be very close to the more conventional ones. (author)

  20. Natural gas benefits

    International Nuclear Information System (INIS)

    1999-01-01

    The General Auditor in the Netherlands studied the natural gas policy in the Netherlands, as has been executed in the past decades, in the period 1997-1999. The purpose of the study is to inform the Dutch parliament on the planning and the backgrounds of the natural gas policy and on the policy risks with respect to the benefits for the Dutch State, taking into account the developments in the policy environment. The final conclusion is that the proposed liberalization of the national natural gas market will result in a considerable deprivation of income for the State in case the benefit policy is not adjusted. This report includes a reaction of the Dutch Minister of Economic Affairs and an afterword of the General Auditor. In the appendix an outline is given of the natural gas policy

  1. Web life: Ask Nature

    Science.gov (United States)

    2012-11-01

    Ask Nature is a site devoted to biomimicry, an interdisciplinary field in which practitioners study how animals and plants solve problems, and then use those solutions to develop better human technologies.

  2. Natural gas pricing

    International Nuclear Information System (INIS)

    Freedenthal, C.

    1993-01-01

    Natural gas pricing is the heart and soul of the gas business. Price specifically affects every phase of the industry. Too low a price will result in short supplies as seen in the mid-1970s when natural gas was scarce and in tight supply. To fully understand the pricing of this energy commodity, it is important to understand the total energy picture. In addition, the effect and impact of world and US economies, and economics in general are crucial to understanding natural gas pricing. The purpose of this presentation will be to show the parameters going into US natural gas pricing including the influence of the many outside industry factors like crude oil and coal pricing, market drivers pushing the gas industry, supply/demand parameters, risk management for buyers and sellers, and other elements involved in pricing analysis

  3. Art, Technology and Nature

    DEFF Research Database (Denmark)

    Since 1900, the connections between art and technology with nature have become increasingly inextricable. Through a selection of innovative readings by international scholars, this book presents the first investigation of the intersections between art, technology and nature in post-medieval times....... Transdisciplinary in approach, this volume’s 14 essays explore art, technology and nature’s shifting constellations that are discernible at the micro level and as part of a larger chronological pattern. Included are subjects ranging from Renaissance wooden dolls, science in the Italian art academies, and artisanal...... Camilla Skovbjerg Paldam and Jacob Wamberg trace the Kantian heritage of radically separating art and technology, and inserting both at a distance to nature, suggesting this was a transient chapter in history. Thus, they argue, the present renegotiation between art, technology and nature is reminiscent...

  4. Nature as Dissonant Heritage

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2014-01-01

    -evident. But who define and decide what kind of nature to restore? And is nature restoration not a contradiction in terms in our deeply cultivated landscapes? To examine these questions it makes sense to draw parallels between nature restoration and the concept of ‘dissonant heritage’ (Ashworth 2010), which...... concerns situations of mismatch between people and their heritage. The aim of the paper is to uncover the latent cultural dissonance in relation to nature restoration and to explain how landscape architecture could play an important role in the management of this dissonance. If one accepts that heritage...... is not the same as history, but a contemporary product shaped from history, it is clear that the same area or object could be part of different heritages, creates by different groups of people for different reasons. Heritance logically and potentially involves disinheritance – our heritage is not necessary...

  5. Natural product antifoulants

    Digital Repository Service at National Institute of Oceanography (India)

    Raveendran, T.V.; Mol, V.P.L.

    Natural Product Antifoulants (NPAs) have been proposed as one of the best replacement options for the most successful antifouling agent, tri-n-butyl tin (TBT), which, due to its ecological incompatibility, is currently facing total global ban...

  6. Breast reconstruction - natural tissue

    Science.gov (United States)

    ... After a mastectomy , some women choose to have cosmetic surgery to remake their breast. This type of surgery ... cancer - breast reconstruction with natural tissue Patient Instructions Cosmetic breast surgery - discharge Mastectomy and breast reconstruction - what to ask ...

  7. Solitonic natural orbitals

    Science.gov (United States)

    Cioslowski, Jerzy

    2018-04-01

    The dependence of the natural amplitudes of the harmonium atom in its ground state on the confinement strength ω is thoroughly investigated. A combination of rigorous analysis and extensive, highly accurate numerical calculations reveals the presence of only one positive-valued natural amplitude ("the normal sign pattern") for all ω ≥1/2 . More importantly, it is shown that unusual, weakly occupied natural orbitals (NOs) corresponding to additional positive-valued natural amplitudes emerge upon sufficient weakening of the confinement. These solitonic NOs, whose shapes remain almost invariant as their radial positions drift toward infinity upon the critical values of ω being approached from below, exhibit strong radial localization. Their asymptotic properties are extracted from the numerical data and their relevance to calculations on fully Coulombic systems is discussed.

  8. Historic Natural Vegetation

    Data.gov (United States)

    California Natural Resource Agency — In 2001, the US Fish and Wildlife Service (USFWS) and the U.S. Bureau of Reclamation (BOR) contracted with the California State University, Chico Research Foundation...

  9. Natural Gas Liquid Pipelines

    Data.gov (United States)

    Department of Homeland Security — Natural gas interstate and intrastate pipelines in the United States. Based on a variety of sources with varying scales and levels of accuracy and therefore accuracy...

  10. Is image steganography natural?

    Science.gov (United States)

    Martín, Alvaro; Sapiro, Guillermo; Seroussi, Gadiel

    2005-12-01

    Steganography is the art of secret communication. Its purpose is to hide the presence of information, using, for example, images as covers. We experimentally investigate if stego-images, bearing a secret message, are statistically "natural." For this purpose, we use recent results on the statistics of natural images and investigate the effect of some popular steganography techniques. We found that these fundamental statistics of natural images are, in fact, generally altered by the hidden "nonnatural" information. Frequently, the change is consistently biased in a given direction. However, for the class of natural images considered, the change generally falls within the intrinsic variability of the statistics, and, thus, does not allow for reliable detection, unless knowledge of the data hiding process is taken into account. In the latter case, significant levels of detection are demonstrated.

  11. Natural Hazards Image Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Photographs and other visual media provide valuable pre- and post-event data for natural hazards. Research, mitigation, and forecasting rely on visual data for...

  12. Natural gas supplies

    International Nuclear Information System (INIS)

    2009-10-01

    This article comments data about the share of natural gas in the energy demand in Europe, about the uses of natural gas by different sectors (housing and office buildings, electricity production, and industry) in Europe, and about gas European imports and about gas supply origins. Graphs are displaying the evolution of energy demand in some European countries between 1990 and 2006 and for different energy sources (natural gas, coal, oil, primary energy, and renewable energies), the evolution of gas production and consumption in different countries of the European Union between 1990 and 2006, and gas import origins in the European Union in 2006. Gas pipeline projects between gas producing countries and Europe are briefly presented, and the development of liquefied natural gas is briefly commented and outlined as a contribution to supply diversification

  13. Natural Gas Market Hubs

    Data.gov (United States)

    Department of Homeland Security — A hub is a physical transfer point for natural gas where several pipelines are connected. A market center is a hub where the operator offers services that facilitate...

  14. Radon - natural health threat

    International Nuclear Information System (INIS)

    Wrixon, Anthony

    1985-01-01

    Natural sources of radiation attract little attention, yet a survey has found radon gas in buildings at levels which put the occupants at some risk. The author wants safety standards set without undue delay. (author)

  15. Are Emotions Natural Kinds?

    Science.gov (United States)

    Barrett, Lisa Feldman

    2006-03-01

    Laypeople and scientists alike believe that they know anger, or sadness, or fear, when they see it. These emotions and a few others are presumed to have specific causal mechanisms in the brain and properties that are observable (on the face, in the voice, in the body, or in experience)-that is, they are assumed to be natural kinds. If a given emotion is a natural kind and can be identified objectively, then it is possible to make discoveries about that emotion. Indeed, the scientific study of emotion is founded on this assumption. In this article, I review the accumulating empirical evidence that is inconsistent with the view that there are kinds of emotion with boundaries that are carved in nature. I then consider what moving beyond a natural-kind view might mean for the scientific understanding of emotion. © 2006 Association for Psychological Science.

  16. PLATAFORMA PARA LA VENTA DE VIDEOJUEGOS DIGITALES PARA PC

    OpenAIRE

    Gómez-Eguílar, Javier

    2013-01-01

    A lo largo del trabajo vamos a exponer nuestra propia idea de negocio de una nueva empresa, llamada GAMERINET, que se dedique a la venta de videojuegos de ordenador en descarga digital a través de nuestra web. Para ello vamos a ver una breve introducción a este sector de negocio y su historia, haremos un análisis de las condiciones actuales del sector, a través del análisis del entorno específico (5 Fuerzas de Porter) y del análisis del entorno general (Análisis PEST). Posterio...

  17. NUEVOS MODELOS PARA PREDECIR EL PUNTO FLASH PARA ALCANOS PUROS

    OpenAIRE

    Richart Vázquez-Román; Edna M. Valenzuela-Acosta; Florianne Castillo-Borja

    2010-01-01

    En este trabajo se desarrollan dos modelos predictivos de la temperatura normal de punto de inflamación. Los modelos propuestos consideran términos adimensionales en su expresión, los cuales han reducido el error en la predicción de la temperatura del punto de inflamación para alcanos. Se observó que la relación entre la temperatura en el punto de inflamación y la de ebullición aparentemente tienen poca variabilidad por lo cual se puede deducir una regla heurística. La dispersión del error co...

  18. TRABALHAR PARA ESTUDAR / ESTUDAR PARA TRABALHAR: REALIDADE E POSSIBILIDADES

    Directory of Open Access Journals (Sweden)

    Janes Siqueira

    2011-07-01

    Full Text Available O trabalho que apresentamos é parte da pesquisa com os estudantes das licenciaturas e da pedagogia da Universidade de Santa Cruz do Sul-UNISC-RS-Brasil. Este está inserido na linha de pesquisa: educação, trabalho e emancipação. Queremos compreender, à luz do materialismo histórico e dialético e das categorias da crítica da economia política, os significados atribuídos pelos estudantes universitários ao fenômeno trabalho e estudo. É uma pesquisa preferentemente qualitativa de natureza dialética. Para Marx, a essência da realidade humana reside no trabalho, mas a fonte de toda a riqueza está na natureza. Logo, trabalho, natureza e sociedade estão em relação dialética. Trabalho, portanto, é a ideia central articuladora, e natureza e sociedade devem ser estudadas em conexão com o trabalho. Marx trata o trabalho, no modo de produção capitalista, como impedimento ao desenvolvimento humano. Propõe o mesmo como um ato de criação e auto-expressão humana que não deve ter um valor. A compreensão dessa premissa é necessária para que os trabalhadores possam significar e ressignificar o trabalho para além da ideologia dominante. Algumas categorias aparecem como relevantes para a análise: condições de trabalho e de estudo, necessidade de formação, predominância do trabalho sobre o estudo, dificuldade de conciliar tempo de estudo e de trabalho. Na relação com o objeto de estudo, ressaltaremos a crise estrutural do capital, a desregulamentação das leis do trabalho e sua flexibilização e as contradições entre trabalho e estudo bem como quais possibilidades emancipatórias são visualizadas ou sonhadas pelos trabalhadores-estudantes. PALAVRAS-CHAVE: contradições entre trabalho e educação, condições e significados, realidade e possibilidades.

  19. More natural gas

    International Nuclear Information System (INIS)

    Leprince, P.; Valais, M.

    1993-01-01

    This paper reports that large resources and growing markets are the salient prospects of natural gas for the coming decades. The greater impact of natural gas on the worldwide energy market can become a reality if several scientific disciplines can be mobilized in order to succeed in cutting production costs. Modeling, mechanics of complex fluids, and physical chemistry of interfaces are basic disciplines for understanding and mastering the gas processing technologies

  20. Lesson "Balance in Nature

    Science.gov (United States)

    Chapanova, V.

    2012-04-01

    Lesson "Balance in Nature" This simulation game-lesson (Balance in Nature) gives an opportunity for the students to show creativity, work independently, and to create models and ideas. It creates future-oriented thought connected to their experience, allowing them to propose solutions for global problems and personal responsibility for their activities. The class is divided in two teams. Each team chooses questions. 1. Question: Pollution in the environment. 2. Question: Care for nature and climate. The teams work on the chosen tasks. They make drafts, notes and formulate their solutions on small pieces of paper, explaining the impact on nature and society. They express their points of view using many different opinions. This generates alternative thoughts and results in creative solutions. With the new knowledge and positive behaviour defined, everybody realizes that they can do something positive towards nature and climate problems and the importance of individuals for solving global problems is evident. Our main goal is to recover the ecological balance, and everybody explains his or her own well-grounded opinions. In this work process the students obtain knowledge, skills and more responsible behaviour. This process, based on his or her own experience, dialogue and teamwork, helps the participant's self-development. Making the model "human↔ nature" expresses how human activities impact the natural Earth and how these impacts in turn affect society. Taking personal responsibility, we can reduce global warming and help the Earth. By helping nature we help ourselves. Teacher: Veselina Boycheva-Chapanova " Saint Patriarch Evtimii" Scholl Str. "Ivan Vazov"-19 Plovdiv Bulgaria