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. Avaliação de surfactante biodegradavel para polimerização em emulsão : aplicação e desempenho em tintas

    OpenAIRE

    Celia Regina Szcypula Buono

    2010-01-01

    Resumo: O objetivo deste trabalho foi o de avaliar o comportamento de um novo surfactante biodegradável do tipo sulfosuccinato, especificamente desenvolvido para substituir os do tipo alquil fenol etoxilado sulfatado na polimerização em emulsão. Estes últimos apresentam em sua estrutura grupos fenol que os define como não biodegradáveis. Neste trabalho a aplicação deste látex é a tinta imobiliária. Os APEs, como são definidos estes surfactantes, são muito utilizados na indústria imobiliária e...

  3. Antraquinona e surfactante para otimizaçao do processo Kraft com Pinus Spp.

    OpenAIRE

    Mocelin, Ezequiel Zatoni

    2013-01-01

    A madeira de Pinus é atualmente a matéria-prima mais utilizada na obtenção de fibras longas para papel, juntamente com o processo Kraft pela sua versatilidade e por produzir fibras com boa resistência. As atuais perspectivas florestais apontam para uma escassez da madeira de Pinus para os diversos fins, seja para madeira processada, seja para celulose e papel. O processo Kraft tem como desvantagem o baixo rendimento em celulose, devido à solubilização não somente da lignina como também parte ...

  4. Consorcio microbiano nativo con actividad catalítica para remoción de índigo y surfactantes en agua residual industrial textil a través de una matriz de inmovilización

    Directory of Open Access Journals (Sweden)

    Lliana Guerrero Porras

    2014-01-01

    Full Text Available El siguiente estudio tuvo como objetivo aislar seis diferentes cepas bacterianas  provenientes de las descargas de agua utilizadas en la tintura de hilo con colorante índigo, que tuviesen capacidad de degradación de compuestos orgánicos del tinte índigo y tres surfactantes de tipo no iónicos.  Igualmente, se evaluaron diferentes medios de soporte para inmovilizar las cepas seleccionadas. Las cepas con mejor capacidad de decoloración se combinaron para conformar cuatro consorcios (I, II, III, y IV con el fin de potenciar el proceso de decoloración, considerando que la sinergia y el complemento de actividades metabólicas de cultivos mixtos dentro de una comunidad microbiana incrementan la eficiencia de remoción de carga orgánica. Los porcentajes de remoción que se alcanzaron fueron 64, 73, 76 y 59 %, respectivamente. Los cultivos individuales no presentaron porcentajes de remoción superiores a los reportados por los consorcios, lo que permite pensar en su utilización para la remoción de tintes índigos en aguas residuales.

  5. 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)

  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. 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.

  8. 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

  9. 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.

  10. 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

  11. Analysis of the immunogenicity and stability of a porcine pulmonary surfactant preparation administered in rabbits Análise da imunogenicidade e da estabilidade do surfactante pulmonar de origem porcina administrado em coelhos

    Directory of Open Access Journals (Sweden)

    Alexander R. Precioso

    2006-04-01

    Full Text Available PURPOSE: To study the immunogenicity and the stability of the porcine pulmonary surfactant preparation produced by the Instituto Butantan. METHOD: Immunogenicity assay: Sixteen New-Zealand-White rabbits (1000 g body weight were divided into 4 study groups. Each group was assigned to receive either a Butantan surfactant, b Survanta® (Abbott Laboratories, c Curosurf® (Farmalab Chiesi, or d no surfactant. The surfactants were administered intratracheally, and the animals were collected immediately before and 60 and 180 days after surfactant administration. Sera were assayed for the presence of antisurfactant antibodies by enzyme-linked immunosorbent assay (ELISA. Stability assay: The Butantan surfactant used in this assay had been stored for one year in the refrigerator (4 to 8ºC and its stability was evaluated in distinct assay conditions using a premature rabbit model. RESULTS: Immunogenicity assay: None of the surfactants analyzed triggered antibody immune responses against their components in any of the animals. Stability assay: The results of this study demonstrate that Butantan surfactant was as effective as Curosurf when both were submitted to the adverse circumstance of short- and long-term storage at room temperature. A similar level of efficacy for the Butantan surfactant, as compared to Curosurf was demonstrated by the pulmonary dynamic compliance, ventilatory pressure, and pressure-volume curve results. CONCLUSION: The results of our study demonstrate that Butantan surfactant may be a suitable alternative for surfactant replacement therapy.OBJETIVO: Estudar a imunogenicidade e a estabilidade do surfactante de origem porcina produzido pelo Instituto Butantan. MÉTODO: Experimento imunogenicidade: 16 coelhos da raça New-Zealand-White (Peso de 1000g foram divididos em grupos de 4 animais. Cada grupo foi designado para receber: a Surfactante do Butantan, b Survanta® (Abbott Laboratories, c Curosurf (Farmalab Chiesi e d nenhum

  12. 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

  13. 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...

  14. 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 solution

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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.

  20. 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

  1. Influencia genética de las proteínas surfactantes SP-A y SP-D en la neumonía, la gripe por A (H1N1) 2009 y el asma alérgico

    OpenAIRE

    Herrera Ramos, Estefanía

    2015-01-01

    Programa de doctorado: Salud pública: Epidemiología, nutrición y planificación [ES]La presente Tesis Doctoral plantea la hipótesis de que la variabilidad genética de las proteínas surfactantes A y D (SP-A y SP-D) pueden influir en la susceptibilidad y pronóstico de diversas enfermedades pulmonares. Esas variantes podrían utilizarse como marcadores para identificar a los subgrupos de individuos con mayor predisposición a desarrollar una de estas enf...

  2. 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...

  3. 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)

  4. 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.

  5. 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.

  6. 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.

  7. 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

  8. 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

  9. 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

  10. 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)

  11. 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.

  12. Caracterización de la opuntia ficus-indica para su uso como coagulante natural

    OpenAIRE

    Villabona Ortíz, Angel; Paz, Isabel Cristina; Martínez García, Jasser

    2013-01-01

    Título en inglés: Characterization of Opuntia ficus-indica for using as a natural coagulantTítulo corto: Caracterización de Opuntia ficus-indica para coagulante naturalResumenActualmente municipios de la Costa Atlántica Colombiana no cuentan con suministro de agua potable. La aplicación artesanal de la Tuna (Opuntia ficus-indica)  como coagulante es una práctica tradicional en comunidades rurales. En esta investigación se realiza la caracterización del tallo de la Tuna que crece de manera sil...

  13. 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

  14. 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.

  15. 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...

  16. Síntesis y caracterización de surfactantes derivados de sales biliares, éteres corona, adamantanos y cadenas hidrocarbonadas

    OpenAIRE

    Trillo Novo, Juan Ventura

    2015-01-01

    La presente Tesis doctoral abarca aspectos relacionados con la Química supramolecular, el Biomimetismo molecular y la Fisicoquímica de coloides. El estudio ha implicado el diseño, la síntesis y la caracterización en disolución acuosa de numerosos compuestos entre los que sobresalen los derivados de las sales biliares, los éteres corona y grupos hidrófobos como los adamantanos y las cadenas hidrocarbonadas. Comparados con los surfactantes clásicos, los nuevos compuestos ev...

  17. 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

  18. 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.

  19. 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.

  20. Ciclos térmicos para mejorar la eficiencia en la regasificación del gas natural licuado

    OpenAIRE

    Romero Gómez, Manuel

    2016-01-01

    [Resumen] El proceso de regasificación del gas natural licuado (GNL) es una fuente de exergía susceptible de ser recuperada. Esta exergía disponible del GNL tiene su origen en la baja temperatura que posee el gas natural (GN) cuando se licua, para facilitar su transporte y almacenamiento. Para su distribución final hacia los consumidores, el GNL debe ser regasificado. En la regasificación mediante los sistemas convencionales, sea mediante intercambiadores de calor con agua de m...

  1. Fundamentos para una moral natural: la necesidad del naturalismo ético frente al racionalismo axiológico

    OpenAIRE

    Clarke Paliza, George

    2012-01-01

    En esta tesis se discute la validez de los valores morales racionales frente a los valores del mundo natural. Con respecto al antagonismo tradicional entre la moral y la natu-raleza, se presentan los fundamentos para la creación de una moral natural, es decir, una moral cuyas bases axiológicas toman como parámetro a la naturaleza. El carácter histórico y contingente del idealismo moral muestra su insuficiencia para fundar un sistema axiológico fiable que siga el curso de los acontecimientos n...

  2. 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

  3. 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.

  4. Adsorbentes sólidos de origen natural para metales pesados en solución acuosa

    OpenAIRE

    Ángeles Villón, Luis Rosas

    2013-01-01

    En la presente investigación se plantea el resumir y ordenar las investigaciones respecto a los a los adsorbentes sólidos de origen natural para metales pesados en solución acuosa, a través de la clasificación de los mismos por su origen natural, el presentar los parámetros más utilizados en la caracterización de (los adsorbentes, así como en los procesos de adsorción e identificar los adsorbentes de origen natural con capacidad de ser reutilizados. Es así que se ha efectuado esta clasific...

  5. 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)

  6. 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.

  7. Factor de equivalencia en la sustitución de gasolina por gas natural comprimido para uso vehicular

    OpenAIRE

    Agudelo Santamaría, John Ramiro; Amell Arrieta, Andrés Adolfo

    2002-01-01

    En este artículo se presenta un balance completo de la energía en el vehículo cuando éste funciona en modo biocombustible, gasolina-gas natural, para determinar el factor de equivalencia energético entre ambos combustibles (m3 GNC/gal de gasolina). En el modelo se han incluido el motor, la transmisión y el efecto de sobrepeso de los cilindros. Los resultados muestran que el gas natural de la Guajira, no obstante ser el más puro de Colombia, tiene una relación 14,5% menos favorable que el gas ...

  8. Análisis comparativo de dos técnicas para el transporte vertical de la luz natural

    Directory of Open Access Journals (Sweden)

    Gerardo Ramírez González

    2018-01-01

    Full Text Available Este trabajo tiene como objetivo primordial comparar y establecer las relaciones de efectividad entre dos técnicas de diseño para el transporte vertical de la luz natural en el interior de las edificaciones. En primer lugar, se diseñó, construyó y utilizó un equipo experimental tipo concentrador domótico, con distribución a través de fibra óptica hacia un espacio interior sin ninguna iluminación natural tradicional, para monitorizar su efectividad por medio de un luxómetro digital y un recopilador de datos (Datalogger de entrada múltiple. En segundo lugar, se monitorizó el rendimiento lumínico de un lucernario tradicional durante un periodo de seis meses. Finalmente, se realizó un estudio por medio de la Simulación Generada por Computadora (SGC, para establecer la relación entre las proporciones tridimensionales de los ductos de luz y la tasa de degradación de la iluminancia obtenida en el interior del espacio arquitectónico. En términos de resultados, el sistema de iluminación natural por fibra óptica (SINFO no alcanza la efectividad lumínica del lucernario, sin embargo, presenta un rendimiento más uniforme y constante. La idea central es utilizar un criterio de comparación validado, tal como el factor de aprovechamiento de luz diurna (Daylight Factor y otras métricas complementarias, para establecer una relación básica de efectividad entre ambas técnicas. Por último, se establecen recomendaciones de diseño con relación a la utilización de cada una de las técnicas.

  9. Uso de fibra natural de sisal em blocos de concreto para alvenaria estrutural

    OpenAIRE

    Indara Soto Izquierdo

    2011-01-01

    A utilização de fibras vegetais como reforço constitui um grande interesse na obtenção de novos materiais para a construção civil produto de seu baixo custo, alta disponibilidade e reduzido consumo de energia para sua produção. Este trabalho avalia a incorporação de fibras de sisal, de comprimento 20 e 40 mm, e fração volumétrica de 0,5 e 1%, em concretos para a alvenaria de blocos estruturais e determina o uso destas unidades na execução de prismas e mini-paredes. Foram realizados os testes ...

  10. 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)

  11. 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)

  12. 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)

  13. 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.

  14. 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.

  15. Turismo en la Patagonia: Una amenaza para la integridad ecológica del medio natural

    Directory of Open Access Journals (Sweden)

    Luis Inostroza Pino

    2008-01-01

    The tourism in Patagonia is one of the industries of greater growth during the last decade and on which the development of the region of Magallanes is formed. This fever of the nature tourism is articulating to the social group in a deep functional reconversion, the arrival of the tourists grows and the sector is seen with pride by the authorities. Nevertheless one is tourism base on distributed territorial attributes on one of the natural but fragile surroundings of the country , contradiction that originates the present investigation. A comparative analysis between this tourist development sets out and the natural means , a dialectic approach from the landscape ecology by means of the indirect characterization of the ecosystems through their emergent ecological qualities associated to the properties of their fragments ,establishing the space ecological configuration of natural means and comparing it with the intensity of tourist use to that this being put under . The analysis development completely in GIS (Geographic Information System with mathematical fractal witch allows to complement it with other ecological studies of base being generated a powerful tool to orient the protection of our natural patrimony and to articulate it of a sustainable way but with possibly injurious activities. The model allows to establish a pattern of insensible tourist development with the natural means that take control of the last bastions of the ecosystem of Patagonic Andean Forest, excellent ecological areas outside the legal protection of state which shows the urgent necessity of one better territorial management of the preservation and conservation of our special ecological reality.

  16. 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.

  17. Síntesis electroquímica de nanopartículas de plata en presencia de un surfactante neutro

    OpenAIRE

    Blandón, Lucas; Vázquez, Mario V.; Boannini, Elisa; Ballarin, Bárbara

    2015-01-01

    Muchas de las aplicaciones de las nanopartículas de platase encuentran en el área de la medicina como agentesantimicrobianos. Para evaluar la actividad antimicrobianade estos materiales, es importante garantizar que se encuentran estables y que los agentes estabilizantes seanbiocompatibles. Entre los métodos propuestos para lasíntesis de nanopartículas de plata se encuentran losmétodos electroquímicos, que han mostrado tener ventajasgracias a la facilidad para controlar las variables desíntes...

  18. 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.

  19. 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.

  20. Caracterización de la Opuntia ficus-indica para su uso como coagulante natural

    Directory of Open Access Journals (Sweden)

    Angel Villabona Ortíz

    2013-01-01

    Resumen Actualmente municipios de la Costa Atlántica Colombiana no cuentan con suministro de agua potable. La aplicación artesanal de la Tuna (Opuntia ficus-indica  como coagulante es una práctica tradicional en comunidades rurales. En esta investigación se realiza la caracterización del tallo de la Tuna que crece de manera silvestre en el departamento de Bolívar, y del polvo extraído de esta planta, con el fin de identificar componentes asociados a su poder coagulante para la remoción de turbidez y de color en aguas crudas. Las pencas de la planta se sometieron a operaciones de corte, pelado, secado, molienda, tamizado y despigmentado para obtener el coagulante. El rendimiento del proceso global fue de 65g de coagulante/Kg de material vegetal. Los resultados indicaron que la penca contiene alto porcentaje de humedad y pequeñas proporciones de saponinas, flavonoides, sales minerales de calcio y hierro; lo cual permitió concluir que estos metabolitos y sales no son los responsables de su poder coagulante debido a las cantidades poco significativas en las que se encuentran. Se consideró que otras especies química tales como el ácido poligalacturónico y compuestos algínicos son realmente los que le confieran la cualidad al biomaterial. También, se evaluó el poder coagulante del material extraído, se analizó el efecto de tres dosis sobre el color, la turbidez y el pH del agua tratada. Los resultados indicaron que tiene la capacidad de remover 50% del color y 70% de turbidez de aguas crudas con alta turbidez inicial, y que no altera significativamente su pH.  Palabras clave: aguas crudas, clarificación, flavonoides, saponinas, turbidez. Abstract Currently, municipalities in the Colombian Atlantic Coast do not have potable water supply. The implementation of the Tuna as a coagulant is a traditional practice in rural communities, but is used in craft way. In the present investigation, the characterization of the stalk of Tuna (Opuntia ficus

  1. Natural and experimental poisoning by Cestrum laevigatum (Solanaceae among cattle in the Agreste region of Paraíba, Brazil

    Directory of Open Access Journals (Sweden)

    Temístocles Soares de Oliveira Neto

    2017-10-01

    Full Text Available An outbreak of natural poisoning by Cestrum laevigatum was reported among cattle in the Agreste region of Paraíba, which affected six out of 20 animals. Four animals were found dead and two presented clinical signs, including, dyspnea, drooling, jugular vein engorgement, muscle tremors and ataxia, which subsequently progressed to recumbence and death. An experimental poisoning was performed in two bovines who were administered single doses of 35 g kg-1 and 50 g kg-1 body weight (BW, respectively, of fresh leaves and fruits. The animal that received 35 g kg-1 BW had mild clinical signs, consisting of apathy, salivation and reduced ruminal movements with recovery 30 hours after the onset of initial signs. The animal that received 50 g kg-1 BW showed apathy, dry stool, drooling, hyperexcitability, head pressing, opisthotonos, nystagmus, miosis, jugular and episcleral vessel engorgement, ruminal atony, muscle tremors, ataxia, falling, seizures, and sternal recumbence, followed by lateral recumbence, with death occurring 21 hours and 37 minutes after ingestion. The enzyme activities of aspartate aminotransferase and gamma-glutamyltransferase in the serum increased significantly 18 hours after the administration of the plant. The primary gross lesions in the natural and experimental cases were enlarged livers, with rounded edges and accentuation of the lobular pattern on the capsular and cut surfaces. Histopathology revealed diffuse centrilobular coagulative necrosis with hemorrhages and congestion, and the presence of degenerated hepatocytes in the midzonal regions. Based on the epidemiological and clinicopathological data, we concluded that C. laevigatum was responsible for an acute hepatotoxic disease among cattle in the Agreste region of Paraíba.

  2. 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

  3. Fundamentos em processamento de linguagem natural: uma proposta para extração de bigramas

    Directory of Open Access Journals (Sweden)

    Edson Marchetti da Silva

    2014-08-01

    Ë senso comum que o texto escrito é uma importante forma de registrar as informações e que atualmente grande parte desse conteúdo informacional está disponível em meio digital. Entretanto, de maneira geral, os computadores lidam com o texto como sendo uma cadeia de caracteres que não têm nenhum significado. A área de Processamento de Linguagem Natural (PLN vem se empenhando em extrair significados do texto. Nesse sentido este trabalho apresenta uma revisão desse tema e propõe um método automatizado que utiliza uma heurística determinística denominada Heudet que visa extrair bigramas do texto. A meta é extrair o significado do texto através de um conjunto de expressões multipalavras identificadas. Os resultados obtidos foram melhores se  comparados com aqueles que utilizam-se das técnicas de medidas de associação estatística obtidas pelo software Ngram Statistics Package (NSP.

  4. EVALUACIÓN DE UN MODELO PARA ESTIMAR LA TEMPERATURA Y HUMEDAD RELATIVA EN EL INTERIOR DE INVERNADERO CON VENTILACIÓN NATURAL

    Directory of Open Access Journals (Sweden)

    Audberto Reyes-Rosas

    2012-01-01

    Full Text Available Un modelo climático fue evaluado para estimar la evolución horaria de la temperatura del aire y la humedad relativa al interior de un invernadero con ventilación natural de tipo cenital, en función del clima externo. La evaluación se efectuó en el invierno 2008-2009 en un invernadero comercial con producción de tomate, localizado en Tlahualilo, Durango, México. El modelo incorporó los efectos de la ventilación natural para enfriar el invernadero. El resultado de la evaluación en dos días analizados en forma separada mostró un ajuste adecuado para la estimación de la temperatura del aire, y menor ajuste para humedad relativa. Es necesario mejorar la capacidad del modelo para simular el clima del invernadero con la finalidad de utilizarlo en un futuro como una herramienta de apoyo para la toma de decisiones en la operación de invernaderos de este tipo.

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

    OpenAIRE

    Natália Sayuri Shiogiri; Silvia Patrícia Carraschi; Patrícia Cubo; Bárbara Lopes Schiavetti; Claudinei da Cruz; Robinson Antonio Pitelli

    2010-01-01

    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 (I)50;96h) and assess water quality variables for glyphosate in the Rodeo® formulation, Aterbane® BR surfactant and...

  6. INVESTIGANDO OS RUMOS CURRICULARES DA DISCIPLINA HISTÓRIA NATURAL NO COLÉGIO PEDRO II: AS ATAS DE CONCURSOS PARA PROFESSORES COMO FONTE HISTÓRICA

    Directory of Open Access Journals (Sweden)

    Mariana Cassab

    2008-12-01

    Full Text Available Na intenção de contribuir para a compreensão do processo sócio-histórico da mudança do ensino de História Natural para Biologia no Colégio Pedro II, este trabalho procura analisar as atas de três concursos para docentes em História Natural, realizados durante as décadas de 1950/60. Tomadas como testemunhos não-neutros deste processo, a análise das atas sugere transformações e permanências nos conteúdos e métodos selecionados para o ensino de História Natural, em um período de intensas disputas e tensões sobre uma disciplina escolar que procura resistir e manter seu espaço de influência no currículo – a História Natural – e outra que procura se estabelecer – Biologia.

  7. Procedimiento de obtención de moléculas orgánicas útiles como nuevos agentes surfactantes

    OpenAIRE

    Corma, Avelino; Iborra Chornet, Sara; Climent Olmedo, María José; Arias Carrascal, Karen Sulay

    2012-01-01

    Procedimiento de obtención de moléculas orgánicas que comprende los siguientes pasos: (a) Un primer paso de eterificación selectiva del grupo hidroximetil del 5-hidroximetilfurfural (HMF) en presencia de, al menos, un compuesto de cadena carbonada y un catalizador ácido para obtener alcoximetilfurfural; (b) Un segundo paso de oxidación selectiva del grupo formil del compuesto obtenido en el primer paso a grupo carboxilato en presencia de al menos un cataliz...

  8. Modelización de la tensión superficial de surfactantes no iónicos

    OpenAIRE

    Arias Barros, Serxio Ith

    2016-01-01

    En el presente trabajo se realiza un tratamiento cuantitativo de la tensión superficial dinámica a través de diferentes aproximaciones matemáticas, considerando un mecanismo controlado por difusión. El modelo clásico se ha modificado para que describa las condiciones experimentales de forma más precisa al considerar un dominio de difusión finito. Se han fijado los límites del dominio de forma que la concentración en esta región permanezca constante tras la adsorción en la interfase aire-agua,...

  9. 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 ...

  10. 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.

  11. 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.

  12. 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)

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  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. 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.

  20. 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.

  1. 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)

  2. 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)

  3. 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.

  4. 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

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

    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...

  5. Natural and improved natural pastures on the reproductive performance of first-calf beef cows Pastagens naturais e melhoradas no desempenho reprodutivo de vacas de corte primíparas

    Directory of Open Access Journals (Sweden)

    Soraya Tanure

    2011-03-01

    Full Text Available This work evaluated the reproductive performance of first-calf cows at three years of age, submitted or not to protein supplementation at yearling on natural pastures. After calving, cows were managed on natural or improved pastures. The feeding managements were the following: on natural pastures as yearlings and during pregnancy, post-calving period and breeding season; on natural pastures with protein supplement as yearlings and only natural pasture during pregnancy, post-calving and breeding season; on natural pastures as yearlings and during pregnancy and on improved natural pastures (Lolium multiflorum L., Trifolium repens cv. Yi and Lotus corniculatus cv. São Gabriel during the post-calving period and breeding season; on natural pastures with protein supplement at yearling, on natural pastures during pregnancy, and on improved natural pasture during post-calving period and breeding season. Cows did not differ on body weight, but from calving to the beginning of breeding season, cows on improved natural pastures presented higher weight gain than those on natural pastures (0.203 vs. 0.109 kg/day. Cows in post-calving on natural pastures lost 1.0 point of body condition score during mating, determinant of the lowest pregnancy rate and later conception in relation to cows on improved natural pasture. Pregnant cows presented higher body weight (440 vs. 413 kg and body condition score (4.14 vs. 3.66 points than open cows at the end of the breeding season.O trabalho avaliou o desempenho reprodutivo de vacas primíparas aos três anos de idade, submetidas previamente ou não à suplementação protéica no sobreano sobre pastagens naturais. Após o parto, foram manejadas em pastagens naturais ou naturais melhoradas. Os manejos alimentares foram: em pastagem natural na recria e nos períodos de gestação, pós-parto e reprodutivo; em pastagem natural com suplemento protéico na recria e somente pastagem natural durante os períodos de gesta

  6. - Software para Historia clínica Veterinaria aplicada a la Medicina Natural Tradicional y Bioenergética (Software for Veterinary clinical History applied the Traditional Natural Medicine and Bioenergetics)

    OpenAIRE

    MsC. Florángel Vidal Fernández; Dr. Med. Vet. Iván Peña García

    2005-01-01

    Las condiciones de la Cuba de hoy exigen del uso de la Medicina Natural y Bioenergética, en el tratamiento de las diversas enfermedades. Debido al desarrollo de las TIC nos propusimos desarrollar una Base de Datos para lo cual se utilizó el gestor de bases de datos Microsoft Access, aplicándose un enfoque sistémico y se empleó como base informativa del sistema, las entidades: Entrada de datos, Historia clínica, Examen físico, Resultado y evolución. La aplicación se denomina "Historia Clínica ...

  7. El turismo como herramienta para la conservación del patrimonio natural: reserva de biosfera Parque Costero del Sur

    OpenAIRE

    Rossi, Elisabet; Molinari, Gloria Edith

    2012-01-01

    El proyecto se desarrolló en la localidad de Punta Indio, ubicada en el partido del mismo nombre de la provincia de Buenos Aires, que juntamente con otras localidades, conforman la Reserva de Biosfera “Parque costero del Sur", declarado por MaB-UNESCO en 1995, ubicado sobre la margen derecha del Río de La Plata. Se planteó como objetivo, el diseño de una estrategia local y auto-gestionada de desarrollo turístico, como un instrumento para la conservación de la biodiversidad y la valoración del...

  8. 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)

  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. 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)

  11. Analysis of the entrepreneurial strategies for conversion to money the Bolivian natural gas reserves; Analise das estrategias empresariais para monetizacao das reservas de gas natural da Bolivia

    Energy Technology Data Exchange (ETDEWEB)

    Real, Rodrigo Valle; Gutierrez, Margarida; Almeida, Edmar de [Universidade Federal do Rio de Janeiro, RJ (Brazil). Inst. de Economia]. E-mail: rodreal@ig.com.br; margarida@ie.ufrj.br; edmar@ie.ufrj.br

    2002-07-01

    This paper analyses the recent evolution of the natural gas in Bolivia. During the last years the sector opening allowed the private investments increasing by international enterprises, and a great increasing of the reserves. The paper presents various alternatives for the commercialization of the produced gas in the market and consequently, allowing the enterprises detaining part of the reserves follow different strategies, in accordance with their positioning in the region their core business and the perspective for the market expansion.

  12. 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.

  13. A topofilia dos cidadãos para com o patrimônio natural urbano: O caso da cidade de Coimbra The citizens topophilia and the natural urban patrimony: Coimbra’s case study

    Directory of Open Access Journals (Sweden)

    Gabriel Salles Maria de Macedo Rego

    2012-07-01

    Full Text Available O trabalho em questão analisa, segundo o prisma da Geografia, a importância do patrimônio natural em ambiente urbano. Como objetivo principal, pretende compreender a percepção que os residentes na cidade de Coimbra (Portugal têm da natureza e do papel que o património natural pode desempenhar na qualidade de vida da cidade. Para alcançar esses objetivos, inicia-se o texto com uma reflexão teórica que percorre conceitos como a topofilia e os olhares sociais sobre o ambiente e a natureza em contexto citadino. Depois, seguem-se dois procedimentos diferentes, mas complementares: (1 Como forma de registro da presença e do estado de conservação da natureza em Coimbra e da interação entre os cidadãos e o patrimônio natural naquele espaço geográfico, fez-se uma análise de campo com a montagem de um banco de dados fotográficos que representam excertos deste território; (2 Inquéritos por meio de entrevistas, em dois bairros da cidade – Vale das Flores e Monte Formoso – privilegiando adultos com idades superiores aos 30 anos. Apesar de a pesquisa ter revelado algumas contradições entre a prática e o discurso na percepção e na relação topofílica para com as áreas verdes urbanas, concluiu-se que a presença do patrimônio natural no ambiente urbano ainda se apresenta como uma questão secundária. Contudo, também se verificou que, para reforço desta relação simbólica e/ou funcional, o patrimônio natural deve estar presente em todo o contínuo urbano e não ficar restrito aos bairros mais elitizados ou aos parques.This paper analyzes the importance of natural patrimony in the urban environment, under the prism of geography. The main objective of this study is to understand how nature is perceived in the city of Coimbra (Portugal and the role that green areas and natural patrimony has in the quality of urban life. To achieve these objectives, this article discusses the conceptual argument about environmental perception

  14. 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)

  15. Políticas de Servicio para la Gestión Logística en las Empresas de Comercialización de Crudo Natural

    Directory of Open Access Journals (Sweden)

    Moisés Briñez

    2017-01-01

    Full Text Available Esta investigación tuvo como objetivo describir las políticas de servicio para la gestión logística en las empresas del sector de comercialización de crudo natural en la región Occidente de Venezuela por dos (2 instituciones: Petróleos De Venezuela, S.A (PDVSA y el Servicio Autónomo de Metrología de Hidrocarburos (SAMH. Apoyado en los planteamientos de Anaya (2007, Bowersox y otros (2007, Serra (2009 y el Instituto Aragonés de Fomento (2007. Este estudio se consideró de tipo descriptivo, con un diseño no experimental, transaccional y de campo. La recolección de datos se realizó a través de dos (2 instrumentos tipo cuestionario, el primero fue dirigido a los trabajadores, denominados clientes internos de las empresas, el mismo contiene veinte (20 ítems, mientras que el segundo fue administrado a los Gerentes de estas Instituciones, con un total de veintidós (22 ítems. El nivel de confiabilidad se obtuvo a través del coeficiente Alfa de Cronbach, el resultado obtenido para el instrumento aplicado a los gerentes es de 0,94 y de 0,873 para el de los clientes internos. De acuerdo a los resultados de esta investigación, se puede observar que a pesar que existe amabilidad, confianza, cortesía, acceso a la información entre oficinas administrativas y terminales de embarque y por ende comunicación, los gerentes no poseen un indicador que muestre la apreciación de los terminales de embarque, en virtud de la gestión de ellos mismos. De igual forma, no existen manuales donde se establezcan patrones a seguir para la solución de problemas e imprevistos.

  16. 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

  17. 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)

  18. Verification procedures of ultrasonic flow meters for natural gas applications; Procedimento de verificacao de medidores ultra-sonicos para gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Lourenco, Tulio C. [TRANSPETRO, Rio de Janeiro, RJ (Brazil)

    2009-12-19

    In recent years, the use of ultrasonic flow meters for natural gas applications has grown significantly, especially after the issuance of AGA Report 9 and AGA Report 10. The reasons this technology has stood out from the others, such as orifice-plates or turbines, are: accuracy, wide range ability, it is bi-directional, robustness, low maintenance and, mainly, integrated diagnostic parameters, such as sound velocity, signal quality and profile velocity analysis. TRANSPETRO currently operates 56 ultrasonic natural gas flow-meter systems. For operational control applications, 90% of the meters are ultrasonic, of which 85% are provided with internal diagnostic tools through the manufacturer's software. Within this perspective, it is essential and unquestionable that there are procedures and routines for ultrasonic flow-meter verification and analysis, in order to monitor their performance and integrity, in addition to the early identification of potential problems. This paper discusses the practical application of several tools and diagnostic parameters inherent in ultrasonic flow meters in periodical verifications using TRANSPETRO's procedure. (author)

  19. 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 ...

  20. 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)

  1. Analytical procedures for identifying anthocyanins in natural extracts; Procedimentos analiticos para identificacao de antocianinas presentes em extratos naturais

    Energy Technology Data Exchange (ETDEWEB)

    Marco, Paulo Henrique; Poppi, Ronei Jesus [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Inst. de Quimica]. E-mail: ronei@iqm.unicamp.br; Scarminio, Ieda Spacino [Universidade Estadual de Londrina (UEL), PR (Brazil). Dept. de Quimica

    2008-07-01

    Anthocyanins are among the most important plant pigments. Due to their potential benefits for human health, there is considerable interest in these natural pigments. Nonetheless, there is great difficulty in finding a technique that could provide the identification of structurally similar compounds and estimate the number and concentration of the species present. A lot of techniques have been tried to find the best methodology to extract information from these systems. In this paper, a review of the most important procedures is given, from the extraction to the identification of anthocyanins in natural extracts. (author)

  2. 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)

  3. 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)

  4. 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)

  5. 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

  6. Geração de Linguagem Natural para Conversão de Dados em Texto - Aplicação a um Assistente de Medicação para o Português

    Directory of Open Access Journals (Sweden)

    José Casimiro Pereira

    2015-07-01

    Full Text Available Novos equipamentos como 'smartphones' ou 'tablets' têm revolucionado a interacção do ser humano com a tecnologia, proporcionando novos desafios e oportunidades. Estes novos dispositivos são multimodais por natureza. De entre as várias modalidades, são particularmente interessantes as relacionadas com a interacção por voz e texto. Para que estas formas de interação possam ser usadas entre sistemas e utilizadores humanos, é essencial a existência de módulos capazes de traduzir as informações internas das aplicações em frases ou textos, para visualização no ecrã ou para serem sintetizados de forma a serem ouvidos. É, também, essencial que estes módulos possam gerar frases e textos nas línguas nativas dos utilizadores; que o processo de desenvolvimento não implique grandes conhecimentos e recursos, incluindo tempo de desenvolvimento; e o resultado da geração apresente a variabilidade necessária. O objectivo principal é o de propor, implementar e avaliar um método de conversão de Dados-para-português passível de ser desenvolvido com um mínimo de tempo e conhecimentos, mas sem comprometer a indispensável variabilidade e qualidade do que é gerado. O sistema apresentado, desenvolvido para um cenário de assistência à toma de medicamentos, destina-se a criar descrições, em linguagem natural, de informação sobre medicação a tomar. Motivados por resultados recentes, optou-se por uma abordagem baseada em tradução automática, com os modelos treinados num pequeno corpus paralelo. Para isso, foi criado um novo corpus que, depois de validado, foi utilizado no desenvolvimento do sistema. Foram criadas duas variantes do sistema: uma orientada à tradução baseada em sintagmas e outra fazendo uso de informação sintáctica. Foram realizadas avaliações utilizando métricas automáticas -- BLEU e Meteor -- bem como avaliações por humanos. Os resultados do sistema orientado a sintagmas foram francamente superiores

  7. 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)

  8. 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)

  9. 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)

  10. 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)

  11. 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)

  12. 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)

  13. Solar chimney for the natural ventilation of buildings: simulation and mediation; Chimenea solar para la ventilacion natural de edificios: simulacion y mediacion

    Energy Technology Data Exchange (ETDEWEB)

    Lanceta, D.; Llorente, J.

    2008-07-01

    In this article, the first part of a research project about the modelling of a solar chimney is presented. In this first part, the average ventilation flows measured in an experimental installation have been compared to the results obtained by CFD (Computational Fluid Dynamics) simulations. In order to do so, a solar chimney with a cross-section of 0.78 m x 0.156 m, height 3,6 m, has been constructed. The chimney consists of a glass surface oriented towards the south. The internal (absorber) surface is made of a copper plate, which has been painted black in order to increase the solar absorption. The chimney is connected to a room measuring 5 m x 2.5 m x 2.5 m, from where it extracts air. The comparison of the results obtained by measurements with those obtained by CFD simulations show that computational tools are accurate enough to predict the behaviour of natural buoyancy in this kind of installations. (Author)

  14. 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.

  15. Conversão de veículos flex para o gás natural: problema de escassez e contribuição à sustentabilidade.

    Directory of Open Access Journals (Sweden)

    Sérgio Augusto Pereira Bastos

    2014-10-01

    Full Text Available Dentre as fontes de energia menos poluentes tem-se o gás natural veicular (GNV. Seu uso como fonte de energia no setor de transportes vem crescendo – há projeções de expansão de consumo na ordem de 52% em âmbito mundial entre 2008 e 2035 – e representa uma alternativa para redução do dano ambiental decorrente do uso crescente de fontes energéticas poluentes. Considerando o contexto social, político e econômico, ações sustentáveis são esperadas por parte dos indivíduos e das empresas. Com isso, este estudo objetiva valorar a opção da conversão de veículos leves flex para o gás natural veicular (GNV tendo a contribuição para a sustentabilidade como principal motivador. A metodologia de opções reais e a simulação de Monte Carlo foram empregadas para modelar a opção europeia, já que a decisão de abastecer com GNV, gasolina ou etanol, a cada período, é totalmente independente da decisão dos períodos anteriores, de acordo com Bastian-Pinto, Brandão e Alves (2010, admitindo a capilaridade dos postos de gasolina como um fator adicional de incerteza. Assim, é calculado o valor da flexibilidade obtida pela conversão, considerando incertezas quanto à evolução dos preços dos combustíveis e à escassez do GNV devido a pouca capilaridade de postos com oferta deste combustível. Os resultados mostram que para uma escassez de 25% – aproximadamente a parcela dos postos do estado do Rio de Janeiro em que há oferta de GNV – é requerido um mínimo de 1.200 quilômetros de distância percorrida por mês para que o valor da opção seja positivo. Além disso, o valor da opção pode chegar a 416,8% de retorno sobre o custo da conversão, ou 31% do valor do veículo, mesmo desconsiderando eventual benefício fiscal dado a esse combustível pelas normas brasileiras. Os resultados evidenciam também que existe ganho incorporado à opção analisada, relacionado à sustentabilidade, dado que o GNV é um tipo de energia

  16. 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.

  17. 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)

  18. 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)

  19. 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

  20. EXIGENCIAS DIDÁCTICAS PARA LA ENSEÑANZA DE LA MEDICINA TRADICIONAL Y NATURAL EN LOS ESTUDIANTES DE LA CARRERA DE MEDICINA

    Directory of Open Access Journals (Sweden)

    Mayelín Cruz Batista

    2016-05-01

    Full Text Available El presente artículo ofrece un conjunto de exigencias didácticaspara la enseñanza de la Medicina Tradicional y Natural en los estudiantes de la carrera de Medicina, las cuales se fundamentan en la enseñanza desarrolladora como enfoque de la Pedagogía contemporánea que se aplica en la Educación Médica Superior. Las exigencias didácticas fueron concebidas mediante la aplicación del método sistémico estructural funcional y pueden ser aplicadas mediante las diferentes formas de organización de la docencia que se imparten en las diferentes disciplinas de la carrera de Medicina.PALABRAS CLAVE: Medicina; Medicina Tradicional y Natural; Exigencias Didácticas; Enseñanza Desarrolladora; Educación para la salud.EDUCATIONAL REQUIREMENTS FOR THE TEACHING OF NATURAL MEDICINE IN TRADITIONAL AND STUDENTS CAREER OF MEDICINEABSTRACTThe present article offers a set of didactic requirements for the teaching of the traditional medicine and natural for the students of Medicine in which have a foundation in teaching developer, like a focus of the contemporary Pedagogy that is applicable in the Medical Superior Education. The didactic requirements were conceived by means of the application of the systemic structural functional method and it can be applied by means of differents educational forms of organization in each form of disciplines in Medicine's race.KEYWORDS: Medicine; Traditional Medicine and Native; Didactic Requirements; Teaching advanced; education for health.

  1. Pigmentantes naturais em rações à base de sorgo para codornas japonesas em postura Natural pigments on sorghum-based rations for laying Japanese quails

    Directory of Open Access Journals (Sweden)

    Adolpho Marlon Antoniol de Moura

    2011-11-01

    Full Text Available Esta pesquisa foi realizada para avaliar os efeitos do uso de pigmentantes naturais e extratos de marigold e páprica em rações à base de sorgo para codornas japonesas. Foram utilizadas 180 codornas japonesas (Coturnix japonica, com 98 dias de idade, distribuídas em delineamento inteiramente casualizado em esquema de parcelas subdivididas, composto por cinco tratamentos e seis repetições com seis aves cada. O experimento foi dividido em seis períodos de quatro dias, totalizando 24 dias. Foram analisados o desempenho produtivo e a qualidade dos ovos das codornas. A cor da gema foi avaliada a cada quatro dias durante 24 dias pelo método do escore colorimétrico DSM. Não houve efeito dos tratamentos sobre o desempenho e a qualidade dos ovos das codornas, à exceção da cor da gema. O extrato de marigold proporcionou escore colorimétrico da gema equivalente ao das aves alimentadas com milho. A suplementação associada dos extratos de marigold e páprica proporcionou maior escore colorimétrico e em menor tempo. A utilização de pigmentantes naturais deve ser analisada considerando o escore colorimétrico que se deseja obter e o custo da suplementação de cada fonte comercial.The objective was to evaluate the effects of natural pigments from marigold extract and paprika to Japanese quails fed sorghum-based diets. One hundred and eight Japanese quails (Coturnix japonica, with 98 days of age were distributed in a complete randomized design in a split plot arrangement, with five treatments and six replicates of six birds each. The experiment was divided into six periods of four days each, totaling 24 days. Parameters productive performance and quail egg quality were evaluated. Yolk color was evaluated every 4 days for 24 days by the DSM colorimetric score method. There was no effect of experimental diets on performance or quality of quail egg, except for egg yolk color. The extract of marigold promoted yolk color scores equivalent to those

  2. 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.

  3. 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.

  4. 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.

  5. 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

  6. 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.

  7. 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)

    1996-12-31

    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.

  8. Análisis de la percepción social para la ordenación de un espacio litoral: la ampliación del Parc Natural dels Aiguamolls de l’Empordà, Girona

    OpenAIRE

    Villares Junyent, Míriam; Roca Bosch, Elisabet

    2011-01-01

    La evaluación de problemas y conflictos que afectan a la ordenación de las áreas protegidas han impedido una comprensión profunda de la dimensión social. Analizar las percepciones y las actitudes frente a las estrategias puede producir información pertinente para mejorar la gestión de estos espacios. Esta comunicación presenta los resultados de una investigación llevada a cabo en el ámbito del Parc Natural dels Aiguamolls de l'Empordà, en la Costa Brava, Girona, donde una propuesta para ampli...

  9. 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

  10. Análise da Inteligibilidade de textos via ferramentas de Processamento de Língua Natural: adaptando as métricas do Coh-Metrix para o Português

    Directory of Open Access Journals (Sweden)

    Carolina Evaristo Scarton

    2010-04-01

    Full Text Available Este artigo apresenta o projeto de adaptação de métricas da ferramenta Coh-Metrix para o português do Brasil (Coh-Metrix-Port. Descreve as ferramentas de processamento de língua natural para o português que foram utilizadas, juntamente com as decisões tomadas para a criação da Coh-Metrix-Port. O artigo traz duas aplicações da ferramenta Coh-Metrix-Port: (i a avaliação de textos jornalísticos e sua versão para crianças, mostrando as diferenças entre os textos supostamente complexos e textos simples, isto é, os textos reescritos; (ii a criação de classificadores binários (com córpus de textos dedicados a adultos e crianças, analisando a influência do gênero no desempenho destes classificadores (gêneros jornalístico e de divulgação científica e de textos de outras fontes. A precisão do melhor classificador treinado foi conseguida com a implementação de Support Vector Machines (SMO do WEKA e foi de 97%. Como as métricas desta ferramenta ajudam a discriminar com boa precisão textos dedicados a adultos e a crianças, acreditamos que elas possam também ajudar a avaliar se textos disponíveis na Web são simples o suficiente para serem inteligíveis por analfabetos funcionais e pessoas com outras deficiências cognitivas, como afasia e dislexia, e também para crianças e adultos em fase de letramento e assim permitir o acesso dos textos da Web para uma gama maior de usuários.

  11. Immunological responses of the mangrove oysters Crassostrea gasar naturally infected by Perkinsus sp. in the Mamanguape Estuary, Paraíba state (Northeastern, Brazil).

    Science.gov (United States)

    Queiroga, Fernando Ramos; Marques-Santos, Luis Fernando; Hégaret, Hélène; Soudant, Philippe; Farias, Natanael Dantas; Schlindwein, Aline Daiane; Mirella da Silva, Patricia

    2013-08-01

    Perkinsus genus includes protozoan parasites of marine mollusks, especially bivalves. In the last four years, this parasite has been detected in mangrove oysters Crassostrea rhizophorae and Crassostrea gasar from the Northeastern region of Brazil. Hemocytes are the key cells of the oyster immune system, being responsible for a variety of cellular and humoral reactions, such as phagocytosis, encapsulation and the release of several effector molecules that control the invasion and proliferation of microorganisms. In Brazil, there is little information on perkinsosis and none on the immune responses of native oysters' species against Perkinsus spp. The objective of this study was to determine the effects of natural infection by Perkinsus sp. on the immunological parameters of mangrove oysters C. gasar cultured in the Mamanguape River Estuary (Paraíba, Brazil). Adults oysters (N = 40/month) were sampled in December 2011, March, May, August and October 2012. Gills were removed and used to determine the presence and intensity of the Perkinsus sp. infection, according to a scale of four levels (1-4), using the Ray's fluid thioglycollate medium assay. Immunological parameters were measured in hemolymph samples by flow cytometry, including: total hemocyte count (THC), differential hemocyte count (DHC), cell mortality, phagocytic capacity, and production of Reactive Oxygen Species (ROS). The plasma was used to determine the hemagglutination activity. The results showed the occurrence of Perkinsus sp. with the highest mean prevalence (93.3%) seen so far in oyster populations in Brazil. Despite that, no oyster mortality was associated. In contrast, we observed an increase in hemocyte mortality and a suppression of two of the main defense mechanisms, phagocytosis and ROS production in infected oysters. The increase in the percentage of blast-like cells on the hemolymph, and the increase in THC in oysters heavily infected (at the maximum intensity, 4) suggest an induction of

  12. Iluminação natural: indicações de profundidade-limite de ambientes para iluminação natural no Regulamento Técnico da Qualidade do Nível de Eficiência Energética de Edifícios Residenciais - RTQ-R

    Directory of Open Access Journals (Sweden)

    Milena Sampaio Cintra de Albuquerque

    Full Text Available A iluminação natural, além de ser importante recurso para promover bem-estar e qualidade ambiental, tem impacto relevante na redução do uso de energia. O Regulamento Técnico da Qualidade do Nível de Eficiência Energética de Edifícios Residenciais (RTQ-R foi publicado no Brasil em agosto de 2010, dando sequência ao Programa Brasileiro de Etiquetagem do Inmetro voltado para edificações. Com relação a aspectos bioclimáticos da arquitetura dos edifícios, tais como iluminação natural, buscou-se desenvolver alguns pré-requisitos e bonificações para os ambientes, de forma que esses aspectos fossem considerados na avaliação de edificações residenciais. Neste artigo, apresentam-se o método e os resultados que geraram as indicações relativas à bonificação de iluminação natural presentes no Regulamento. O método utilizado incluiu 336 simulações computacionais dinâmicas com o software DaySim, com o objetivo de investigar a influência de variáveis arquitetônicas no desempenho da iluminação natural, mais especificamente a profundidade dos ambientes e as proteções solares. As simulações foram realizadas para 11 cidades brasileiras, abarcando 11 diferentes latitudes e 4 zonas bioclimáticas (ZB 1 , ZB 3, ZB 4 e ZB 4. Os resultados geraram indicações sobre a profundidade-limite de ambientes, que foram adotadas como parâmetros para concessão da bonificação de iluminação natural no RTQ-R.

  13. 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)

  14. Synthesis and characterization of zeolite material from coal ashes modified by surfactant; Sintese e caracterizacao de material zeolitico de cinzas de carvao modificado por surfactante

    Energy Technology Data Exchange (ETDEWEB)

    Fungaro, D.A., E-mail: dfungaro@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (CQMA/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Quimica e Meio Ambiente; Borrely, S.I. [Instituto de Pesquisas Energeticas e Nucleares (CTR/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Tecnologia das Radiacoes

    2010-07-01

    Coal ash was used as starting material for zeolite synthesis by means of hydrothermal treatment. The surfactant-modified zeolite (SMZ) was prepared by adsorbing the cationic surfactant hexadecyltrimethylammonium bromide (HDTMA-Br) on the external surface of the zeolite from coal ash. The zeolite structure stability was monitored during the characterization of the materials by FTIR, XDR and SEM. The structural parameters of surfactant-modified zeolite are very close to that of corresponding non-modified zeolite which indicates that the crystalline nature of the zeolite remained intact after required chemical treatment with HDTMA-Br molecules and heating treatment for drying. The most intense peaks in the FTIR spectrum of HDTMA-Br were observed in SMZ spectrum confirming adsorption of surfactant on zeolites. (author)

  15. Synthesis and characterization of zeolite from coal ashes modified by cationic surfactant; Sintese e caracterizacao de zeolita de cinzas de carvao modificada por surfactante cationico

    Energy Technology Data Exchange (ETDEWEB)

    Fungaro, D.A.; Borrely, S.I., E-mail: dfungaro@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2012-01-15

    Zeolite synthesized from coal fly ash was modified with different concentrations (2 and 20 mmol.L{sup -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. (author)

  16. Pedagogía para la sostenibilidad basada en la recuperación de tres vínculos: vital, humano y natural

    OpenAIRE

    Moreno Yus, María Ángeles

    2007-01-01

    La finalidad de este artículo es la de proponer una reflexión sobre el papel de la educación para la sostenibilidad, desde las premisas de un pensamiento humanista y naturalista del mundo como base para comprender las claves de la vida en nuestro planeta. Un pensamiento capaz de fortalecer los vínculos existentes del ser humano con su medio desde un punto de vista global e interdisciplinar. Estos aspectos son tomados en consideración en el primer punto. En el segundo y tercer punto se abo...

  17. La modulación de sentencias de la Corte Constitucional: ¿juez natural para la responsabilidad del Estado legislador?

    Directory of Open Access Journals (Sweden)

    Juan Pablo Sarmiento Erazo

    2010-12-01

    Full Text Available Este artículo expone la investigación efectuada sobre la jurisprudencia constitucional en torno a efectos de sentencias distintas a los fallos ex nunc, que se dimensionan en el tiempo o que adicionan a beneficiarios de la norma declarada inconstitucional, y en fin, los distintos tipos de sentencias de constitucionalidad que tienen efectos patrimoniales, tanto para el Estado como para el individuo. Se argumenta que, ciertos fallos dotados de amplio margen de activismo judicial pueden conducir a la reparación de perjuicios causados al individuo por normas inconstitucionales insertas en la disposición evaluada por el Tribunal Constitucional.

  18. Sequência metodológica para a estimativa da iluminação natural e suas implicações em sistemas de avaliação de desempenho de edificações

    Directory of Open Access Journals (Sweden)

    Raphaela Walger da Fonseca

    Full Text Available Resumo Este trabalho teve por objetivo propor um método simplificado que integre a aplicação de redes neurais artificiais (RNA com zoneamento de iluminação natural para a estimativa da redução do consumo energético de edifícios não residenciais em função do aproveitamento da luz natural. Utilizou-se metamodelagem, sendo as redes treinadas com base em resultados obtidos através de simulações computacionais energéticas integradas. Utilizou-se a técnica de amostragem Hipercubo Latino para gerar os dados de entrada, que foram parametrizados com o plug-in Grasshopper e simulados com o plug-in Diva, do programa Rhinoceros. Para a aplicação do método propôs-se uma RNA tendo como parâmetro de saída densidade de potência de iluminação em uso combinada, através de ponderação por área, com um zoneamento de iluminação natural que considera o dinamismo do clima. Discutiu-se a relação entre a sequência proposta, cujos erros foram inferiores a 5%, o RTQ-C e índices mínimos de iluminação natural. Como conclusão geral, pode-se dizer que o método simplificado tem potencial para ser replicado e utilizado dadas sua precisão, velocidade e facilidade de aplicação. Para a aplicação do método em instrumentos de regulação, é importante que os índices mínimos de desempenho luminoso sejam cuidadosamente avaliados devido a seu impacto significativo no consumo energético das edificações.

  19. Analysis of the potencial of natural illumination for the savings and efficient use of the energy in buildings located in hot climates; Analisis del potencial de la iluminacion natural para ahorro y uso eficiente de la energia en las edificaciones en climas calidos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Chavez, J. R. [Universidad Autonoma Metropolitana-Azcapotzalco, Division de Ciencias y Artes para el Diseno, Departamento de Medio Ambiente, (Mexico)

    1997-12-31

    Daylight is an essential factor in lightening buildings. Its use is not only oriented to supply illumination to the spaces to provide adequate lightening levels for the optimum execution of their occupants` tasks, but also to supply the appropriate illumination level required in each case for specific functions, as well as to contribute to the psychophysiological health of its users and provide a favorable ambient and the germicide action in the ultraviolet component of the sunlight and besides a portion of vitamin {sup D,} that is needed for people`s health. On the other hand, the rational and efficient use of daylight can contribute to the diminish the consumption of electric power, that is used for the artificial lightning of buildings. This situation is particularly important in hot climates, where the consumption of electricity for lightening interior spaces is huge, mainly in non-dwelling buildings. In this paper the possibilities of the utilization of daylight are explored and analyzed for the purpose of achieving energy savings and the visual thermal and lightning comfort in buildings. [Espanol] La luz natural diurna es un factor indispensable en los edificios. Su uso no solamente esta orientado a proveer de iluminacion a los espacios para proporcionar niveles de iluminancia adecuados para la optima realizacion de las tareas visuales de los ocupantes, sino tambien para proporcionar la calidad luminica que se requiere para cada caso y funcion especificas, asi como contribuir a la salud psicofisiologica de los usuarios al brindarles un ambiente favorable y la accion germicida en la componente ultravioleta luminica y ademas, un contenido de vitamina {sup D,} necesario para la salud de las personas. Por otra parte, el uso sensato y eficiente de la luz natural diurna puede contribuir a reducir el consumo de energia electrica que se utiliza para el alumbrado artificial de los edificios. Esta situacion es de particular importancia en climas calidos, donde los

  20. Analysis of the potencial of natural illumination for the savings and efficient use of the energy in buildings located in hot climates; Analisis del potencial de la iluminacion natural para ahorro y uso eficiente de la energia en las edificaciones en climas calidos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Chavez, J R [Universidad Autonoma Metropolitana-Azcapotzalco, Division de Ciencias y Artes para el Diseno, Departamento de Medio Ambiente, (Mexico)

    1998-12-31

    Daylight is an essential factor in lightening buildings. Its use is not only oriented to supply illumination to the spaces to provide adequate lightening levels for the optimum execution of their occupants` tasks, but also to supply the appropriate illumination level required in each case for specific functions, as well as to contribute to the psychophysiological health of its users and provide a favorable ambient and the germicide action in the ultraviolet component of the sunlight and besides a portion of vitamin {sup D,} that is needed for people`s health. On the other hand, the rational and efficient use of daylight can contribute to the diminish the consumption of electric power, that is used for the artificial lightning of buildings. This situation is particularly important in hot climates, where the consumption of electricity for lightening interior spaces is huge, mainly in non-dwelling buildings. In this paper the possibilities of the utilization of daylight are explored and analyzed for the purpose of achieving energy savings and the visual thermal and lightning comfort in buildings. [Espanol] La luz natural diurna es un factor indispensable en los edificios. Su uso no solamente esta orientado a proveer de iluminacion a los espacios para proporcionar niveles de iluminancia adecuados para la optima realizacion de las tareas visuales de los ocupantes, sino tambien para proporcionar la calidad luminica que se requiere para cada caso y funcion especificas, asi como contribuir a la salud psicofisiologica de los usuarios al brindarles un ambiente favorable y la accion germicida en la componente ultravioleta luminica y ademas, un contenido de vitamina {sup D,} necesario para la salud de las personas. Por otra parte, el uso sensato y eficiente de la luz natural diurna puede contribuir a reducir el consumo de energia electrica que se utiliza para el alumbrado artificial de los edificios. Esta situacion es de particular importancia en climas calidos, donde los

  1. Natural gas markets integration in the Southern Cone: analysis of interests and stakeholders; Perspectivas para a integracao gasifera no Cone Sul: uma analise dos principais interesses e interessados

    Energy Technology Data Exchange (ETDEWEB)

    Villas Boas, Marina Vieira [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    Natural gas has been recently gaining importance in the world energy mix especially because of its economical and environmental advantages but also because of technological and geopolitical issues. In the Southern Cone, natural gas demand shall maintain its upward trend in the next years mainly due to its use in power generation. This region owns significant natural gas reserves and, at the same time, a growing and with high potential market. In this scenario, natural gas markets integration is seen simultaneously as an opportunity and a necessity as it can contribute to demand and production interconnection, price competitiveness and security of supply. Nevertheless, there are important barriers to the consolidation of natural gas market integration in the Southern Cone region that have to be overcome. For the natural gas markets integration to be a sustainable project it is necessary to identify the major stakeholders and their interests and pursue a balance between them. (author)

  2. 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.

  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. Parque Nacional el Chico, marco geográfico-Natural y propuesta de zonificación para su manejo operativo

    Directory of Open Access Journals (Sweden)

    Carlos Melo Gallegos

    1994-01-01

    Full Text Available The aim of this study is to correct the Management Plan of El Chico National Park, which is characterized by a weal geographic basis and a deficient cartographic representation of the environment and its natural resources. Different thematic maps have been elaborated, analyzed and interpreted. A proposed zonation of the Park provides the basis for a better management, in which the conservation of natural resources harmonizes with recreational, scientific, cultural and educational activities.

  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. 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.

  9. Determination of strontium isotopic composition in natural waters: examples of application in subsurface waters of the coastal zone of Bragantina region, Para, BR

    International Nuclear Information System (INIS)

    Bordalo, Adriana Oliveira; Moura, Candido Augusto Veloso; Scheller, Thomas

    2007-01-01

    Analytical procedures used for determining the concentrations and isotope composition of strontium in subsurface waters, by mass spectrometry, are described. Sampling was performed in coastal plateaus, salt marsh and mangrove environments in the coastal region of Para. Coastal plateau waters have δ 87 Sr between 1.51 and 6.26 per mille and Sr concentration bellow 58 ppb. Salt marsh waters show δ 87 Sr between 0.55 and 0.90 per mille and Sr concentration between 93 and 114 ppm, while mangrove waters have δ 87 Sr per mille around zero and Sr concentration above 15 ppm. Differences in the 87 Sr/ 86 Sr ratio in these subsurface waters are detected, as well as seasonal variations in the coastal plateau waters. (author)

  10. 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

  11. 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)

  12. Emissão de mercúrio para a atmosfera pela queima de gás natural no Brasil Mercury emissions to the atmosphere from natural gas burning in Brazil

    Directory of Open Access Journals (Sweden)

    Luiz Drude de Lacerda

    2007-04-01

    Full Text Available Increasing natural gas use in Brazil triggered a discussion of its role as a Hg source. We show that Hg emissions to the atmosphere from fossil fuel combustion for power generation in Brazil contribute with 6.2% (4.2 t yr-1 to the total anthropogenic Hg atmospheric emissions, with coal combustion and biomass burning as major sources. Natural gas contributes with 0.04 t yr-1, mostly from electricity generation (88% and industrial uses (7.6%. Preliminary results on Hg concentrations in natural gas suggest that a large fraction of it is trapped during refining and transport, which may create Hg point sources between extraction and consumption.

  13. 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

  14. 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.

  15. 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)

  16. 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.

  17. 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)

  18. The strategic importance of the natural gas as raw material for the Camacari, Bahia, Brazil, industrial pole; A importancia estrategica do gas natural como materia-prima para o polo industrial de Camacari, BA

    Energy Technology Data Exchange (ETDEWEB)

    Grassi, Monica Oliveira; Caruso, Carlos Alberto da Rocha; Domingues, Suzana Marques; Pereira, Antonio Constantino [Braskem S.A., Camacari, BA (Brazil). Unidade de Insumos Basicos], e-mails: monica.grassi@braskem.com.br; carlos.caruso@braskem.com.br; suzana.domingues@braskem.com.br; constantino.pereira@braskem.com.br

    2008-01-15

    This work emphasizes the importance and the benefit of the application of natural gas from Manati, Brazil, as raw material for the petrochemical, chemical and fertilizers industries at the Camacari industrial pole, Bahia, Brazil, allowing they are more competitive in their actuation area. Initially, it is presented the world overview as far the raw material diversification on the petrochemical processes, face the present scenery of high competitiveness and low practiced margins, according to a general view of the offer and demand of gas in Brazil and northeastern area, focusing the Manati, Bahia, Brazil, the main source of gas to the Bahia state. From this point on, a strategy of raw material flexibilization for ethene production, via gaseous route, is presented. A development of viability study for amplification and modernization of a existent unity for ethane recovering from the natural gas of Manati is presented, with quality and types of contaminant different from the original project.

  19. Energy rational and economic use in a metallurgical industry: opportunity for replacing electricity by natural gas; Uso racional e economico da energia dentro de uma industria metalurgica: oportunidade de troca de eletricidade para gas natural

    Energy Technology Data Exchange (ETDEWEB)

    Galvao, Luiz Claudio Ribeiro; Kanayama, Paulo Helio; Udaeta, Miguel Edgar Morales [Universidade de Sao Paulo (USP), SP (Brazil). Escola Politecnica]. E-mail: lcgalvao@pea.usp.br; paulo.kanayama@poli.usp.br; udaeta@pea.usp.br; Rocha, Cidar Ramon Oliva; Affonso, Octavio Ferreira [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Eletrotecnica e Energia (IEE)]. E-mail: cidar_2001@yahoo.com; octavio@pea.usp.br

    2006-07-01

    This paper presents an initial diagnostic on the economic and efficient use of the energy input in metallurgical industries using electrical furnaces. From the foundations of modern energy management and industry characterization the electricity consumption is evaluated for presenting the facility with the energy change to natural gas and the modern methods of complete combustion with oxygen from the air. Taking into consideration the characteristics of real metallurgical industry production, the dimensioning of a natural gas furnace were calculated for replacing the existent electric furnace, with growing margin in the demand. The paper allows to conclude the the possibility is real, also considering the possibility of using the modern methods of co-generation for a complete use of gas which would imply in additional investment to produce electric energy by using a steam turbine.

  20. 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)

  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. 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)

  3. 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.

  4. 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

  5. Interações entre herbicidas e protetores para o controle de capim-annoni em pastagem natural Interactions among herbicides and safeners for the south african lovegrass control in natural grassland

    Directory of Open Access Journals (Sweden)

    Ives Clayton Gomes dos Reis Goulart

    2012-10-01

    Full Text Available A similaridade botânica do capim-annoni com as espécies forrageiras nativas ou cultivadas dificultam o seu controle em pastagens naturais. O objetivo deste trabalho foi avaliar o efeito de associações entre herbicidas e protetores sobre o controle de capim-annoni e a seletividade em pastagem natural. Foram realizados dois experimentos a campo em área de pastagem natural típica do Bioma Pampa avaliando-se herbicidas aplicados em pré e pós-emergência. Outro experimento foi conduzido em casa de vegetação com as espécies capim-annoni e grama forquilha onde foram avaliados os herbicidas glufosinate-ammonium e imazethapyr. Em ambos os experimentos os herbicidas foram avaliados isolados ou em associação com os protetores anidrido naftálico, dietholate e fluxofenim. Os experimentos a campo demonstraram que os herbicidas aplicados em pré ou pós-emergência em interação com os protetores não proporcionaram controle satisfatório do capim-annoni e nem aumento da seletividade à pastagem natural. Por outro lado, o experimento em condições controladas indicou a ocorrência de sinergismo do herbicida glufosinate-ammonium em interação com os protetores anidrido naftálico, dietholate e fluxofenim sobre o capim-annoni. As diferenças relacionadas a estádio de desenvolvimento e densidade de infestação estão relacionadas as variações das respostas nos estudos a campo e em condições controladas. A utilização de herbicidas em associações com protetores apresenta potencialidade de controle seletivo de capim-annoni quando aplicado em plantas em estádios iniciais de desenvolvimento.The botanical similarity of the invasive weed Eragrostis plana Nees (South African lovegrass difficult its selective control in natural pastures. The aim of this study was to evaluate the effect of the association between herbicides and safeners on the control of E. plana and on the selectivity to the natural pastures. Two experiments were conducted at

  6. 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)

  7. 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.

  8. 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)

  9. 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)

  10. 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)

  11. Technological requirements for the efficiency and security in the industry of natural gas in Colombia; Requerimientos tecnologicos para la eficiencia y seguridad en la industria del gas natural en Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Arrieta Andres, Amell; Gil B, Edison

    1996-11-01

    In Colombia cities will be gasified to more than 1000 m. of altitude. The theoretical analyses and experimental evidences show that to these conditions the systems work with decrease of power and excessive emissions of carbon Monoxide (CO) The supply of natural gas will come from a diversity of locations with different chemical compositions. The experience points out that teams that use gas of different composition behave in a different way, being able to locate its operation under undesirable conditions when another substitutes a gas. The studies of interchange of gases in an installed park of teams or to install they allow defining the margin of security in the use of gases of different compositions. The purpose of this report is to show the importance that for the efficient and sure use of the natural gas in Colombia have the studies of the incidence of the altitude and the hygrometry in the good operation from the atmospheric systems to gas and the interchange of the Colombian gases.

  12. 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)

  13. 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)

  14. Educación ambiental popular para el manejo sustentable de recursos naturales en una localidad rural del subtrópico mexicano / Popular environmental education for natural resources sustainable management at a rural community in the mexican subtropics

    Directory of Open Access Journals (Sweden)

    Etztli Morales Reyes

    2016-09-01

    Full Text Available RESUMEN El objetivo principal de este trabajo fue diseñar, ejecutar y evaluar un programa de educación ambiental popular para el manejo sustentable de recursos naturales, a fin de mejorar relaciones entre la comunidad y su entorno natural, a través de la acción participativa, en una localidad rural campesina ubicada en una zona de ecotono, al suroeste del Estado de México. Este trabajo busco promover una visión crítica, en el conocimiento de los problemas del medio natural y social en su conjunto. En él se establecieron las siguientes etapas metodológicas: 1Investigación, en la que se identificaron las necesidades de aprendizaje, y los problemas de interés de la comunidad; 2Educación, en la que se realizó una propuesta curricular de educación ambiental, por medio de dos programas impartidos en doce talleres; 3Acción, se desarrollaron experiencias de educación ambiental popular, mediante talleres con tres grupos, niños, mujeres y hombres; 4Acción –Reflexión- Acción, se evaluaron los resultados de las experiencias sobre educación ambiental. Como resultado, se pudo apreciar que en la evaluación final de los talleres, los participantes pudieron ser capaces de definir, ejemplificar y plantear alternativas, y de realizar acciones para el manejo sustentable de recursos naturales en su comunidad. Palabras Clave: Educación Ambiental Popular, Manejo Sustentable, Recursos Naturales, Localidad Rural, Subtrópico Mexicano. ABSTRACT ABSTRACT The main objective of this study was to design, implement and evaluate a popular environmental education program for natural sustainable resource management, directed to improve relations between community and their natural environment, through participatory action, at a rural community located in ecotone zone, southwest of the State of Mexico. This work was searching to promote a critical vision,on knowledge of natural and social environmental problems as a whole. The following methodological

  15. 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)

  16. Application of gamma irradiation for incorporation of rubber powder in the formulations of EPDM and natural rubber; Aplicacao da radiacao gama para incorporacao do po de borracha em formulacoes de borracha natural e EPDM

    Energy Technology Data Exchange (ETDEWEB)

    Kiyan, Ludmila Y.P.; Parra, Duclerc Fernandes; Lugao, Ademar Benevolo, E-mail: ludmilapozzo@gmail.com [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP/CQMA), Sao Paulo, SP (Brazil). Centro de Quimica e Meio Ambiente

    2013-07-01

    The objective of this work was to study the behavior of the recycling of rubber burrs in form of powder, of the rubber industry from EPDM rubber powder and natural rubber with SBR. The rubber powder was irradiated and reused in rubber artifacts formulations for classical vulcanization. The processed material was irradiated using a {sup 60}Co source in doses of 50, 100, 150 and 200 kGy and a dose rate of 5 kGy s-1 at room temperature. The radiation created devulcanization active sites for subsequent integration of the material (rubber powder) in formulations of commercial use. The processes were compared and their products characterized by analytical methods of the physical properties such as strength and elongation. Satisfactory results were found, noting a major spin-off of EPDM chain demonstrated by increased elongation.

  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. Analytical strategies for uranium determination in natural water and industrial effluents samples; Estrategias analiticas para determinacao de uranio em amostras de aguas e efluentes industriais

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Juracir Silva

    2011-07-01

    The work was developed under the project 993/2007 - 'Development of analytical strategies for uranium determination in environmental and industrial samples - Environmental monitoring in the Caetite city, Bahia, Brazil' and made possible through a partnership established between Universidade Federal da Bahia and the Comissao Nacional de Energia Nuclear. Strategies were developed to uranium determination in natural water and effluents of uranium mine. The first one was a critical evaluation of the determination of uranium by inductively coupled plasma optical emission spectrometry (ICP OES) performed using factorial and Doehlert designs involving the factors: acid concentration, radio frequency power and nebuliser gas flow rate. Five emission lines were simultaneously studied (namely: 367.007, 385.464, 385.957, 386.592 and 409.013 nm), in the presence of HN0{sub 3}, H{sub 3}C{sub 2}00H or HCI. The determinations in HN0{sub 3} medium were the most sensitive. Among the factors studied, the gas flow rate was the most significant for the five emission lines. Calcium caused interference in the emission intensity for some lines and iron did not interfere (at least up to 10 mg L{sup -1}) in the five lines studied. The presence of 13 other elements did not affect the emission intensity of uranium for the lines chosen. The optimized method, using the line at 385.957 nm, allows the determination of uranium with limit of quantification of 30 {mu}g L{sup -1} and precision expressed as RSD lower than 2.2% for uranium concentrations of either 500 and 1000 {mu}g L{sup -1}. In second one, a highly sensitive flow-based procedure for uranium determination in natural waters is described. A 100-cm optical path flow cell based on a liquid-core waveguide (LCW) was exploited to increase sensitivity of the arsenazo 111 method, aiming to achieve the limits established by environmental regulations. The flow system was designed with solenoid micro-pumps in order to improve mixing and

  19. 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

  20. 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)

  1. 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

  2. The fluorimetry for control of internal contamination of exposed workers to natural and enriched uranium; A fluorimetria para o controle da contaminacao interna dos trabalhadores expostos a uranio natural e enriquecido

    Energy Technology Data Exchange (ETDEWEB)

    Gaburo, J.C.; Todo, A.S.; Sordi, G.M.A.A. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: janetegc@net.ipen.br

    2000-07-01

    This study is a part of bioassay program revision applied to the uranium processing plants at IPEN-CNEN/SP. The workers of these facilities handle both natural uranium and uranium compounds with different isotopic composition which could reach up to 20% in 235 U. The most commonly employed techniques for the determination of uranium in urine at IPEN are fluorimetry and alpha spectrometry with detection limit of 1.0 mgL-1. and 1,0 mBqL-1 , respectively. Based in advantages and disadvantages of each technique it is very important to identify the workers groups that should be submitted for these analysis. In this report a limiting value of uranium concentration in urine, mgL-1, obtained by fluorimetry is proposed. All the results greater than these limiting value indicate the necessity to carry out a additional measurement by alpha spectroscopy. The uranium mass that result in a pre-determined limit committed effective dose is function of isotopic composition. Consequently, the predicted value of the measured of urinary excretion is function of isotopic composition also and depends of absorption characteristics when inhaled and of the monitoring interval considered. In this report the uranium concentration values for reference levels and limits doses are determined. Based on these results the procedures to use the fluorimetry or both fluorimetry and alpha-spectrometry were adopted. (author)

  3. 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)

  4. Procedimentos estimativos do potencial de uso de chaminés solares para promover a ventilação natural em edificações de baixa altura

    Directory of Open Access Journals (Sweden)

    Leticia de Oliveira Neves

    Full Text Available A ventilação natural é uma das estratégias mais importantes para o condicionamento térmico passivo de ambientes internos de edificações, podendo ocorrer pela ação dos ventos, pelo efeito chaminé ou pela combinação de ambos. Em áreas urbanizadas, a velocidade do vento é sensivelmente reduzida pelos obstáculos locais, tornando o efeito chaminé uma alternativa de projeto mais viável, pois independe dos ventos. Este artigo tem por objetivo apresentar e discutir procedimentos estimativos do potencial de uso de chaminés solares para edificações de baixa altura, localizadas em regiões de baixa latitude. Desenvolveram-se previsões teóricas, através de um modelo matemático e de simulação computacional. Realizou-se um processo de calibração destes modelos, utilizando como referência os resultados do monitoramento experimental de uma célula de teste. O processo baseou-se na análise comparativa de algumas variáveis selecionadas, considerando-se dados de temperatura superficial, temperatura do ar e vazão volumétrica no interior da chaminé. Os resultados indicaram que os modelos teóricos têm potencial de aplicação na avaliação do desempenho de chaminés solares, especialmente o modelo de simulação, em que foram observadas diferenças inferiores a 20% entre resultados medidos e calculados.

  5. 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

  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. Biorremediación de suelo contaminado con el pesticida 1,1,1-tricloro-2,2’bis(p-clorofenil)etano (DDT) mediante protocolos de bioestimulación y adición de surfactante

    OpenAIRE

    Betancur Corredor, Bibiana

    2013-01-01

    Resumen: El 1,1,1-tricloro-2,2’bis(p-clorofenil)etano (DDT) ha sido usado desde la segunda guerra mundial para controlar enfermedades transmitidas por insectos en humanos y animales domésticos. El uso de estos insecticidas organoclorados se ha prohibido en la mayoría de los países debido a su persistencia en el ambiente, susceptibilidad de biomagnificación y potencial toxicidad a animales superiores. La biorremediación involucra el uso de microorganismos para degradar contaminantes orgánic...

  8. 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.

  9. 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)

  10. 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.

  11. Glicerol como substrato para a produção de biossurfactante por Pseudomonas aeruginosa UCP0992

    OpenAIRE

    Selma Neide Rodrigues Lopes Silva

    2008-01-01

    Os surfactantes são poderosos agentes anfipáticos com aplicação nas indústrias petrolífera, alimentícia e farmacêutica, entre outras. Vários surfactantes quimicamente sintetizados são hoje utilizados, embora o desenvolvimento de produtos biodegradáveis e menos tóxicos, os chamados biossurfactantes, agentes obtidos por via microbiológica, torna-se uma estratégia importante na obtenção de componentes compatíveis com o meio ambiente. Muitos biossurfactantes têm sido produzidos, embora pouc...

  12. 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)

  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. 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

  15. 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

  16. 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.

  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. Evaluación del parasitismo natural de Meteorus laphygmae (Viereck sobre Spodoptera frugiperda (J. E. Smith en algodón y sorgo para las zonas de el Espinal (Tolima y Nariño (Cundinamarca

    Directory of Open Access Journals (Sweden)

    León M. Guillermo

    1984-12-01

    Full Text Available

    En los ultlmos años el Spodoptere frugiperda (LEP. Noctuldae ha sido considerado una de las plagas que causan mayor daño a los cultivos de algodón y sorgo; esta especie se ve afectada frecuentemente en el campo por el parasitoide Meteorus laphygmae (HYM. Braconlade. Con el objeto de evaluar el control natural que ejerce este bracónido sobre Ia plaga, se efectuó 81 presente estudio. EI trabajo se desarrolló durante el primer semestre de 1983 en las zonas de EI Espinal (Tolima y Nariño (Cundinamarca en ocho lotes comerciales de algodón y sorgo, a los cuales se les hicieron las aplicaciones necesarias de insecticidas y se efectuaron las prácticas de cultivo normalmente; se definieron tres parcelas de una hectárea por lote y semanalmente se muestrearon en cada una de ellas cinco sitios al azar; para ambos cultivos se revisaron dos metros cuadrados por sitio. En los muestreos de campo se colectaron todas las larvas de S. frugiperdi y después fueron llevadas al laboratorio Jaime Moor de la Federación Nacional de Algodoneros, para determinar si estaban o no parasitadas; en caso de estarlo se identificó el organismo causante. Los parasitoides encontrados fueron M.laphygmae (HYM. Braconidae, Apanteles sp., (HYM. Braconidae, Chelonus texanus (HYM. Braconidae, Dípteros de las famillas Tachinidae, Phoridae y Calliphoridae, Nemátodos de la familia Marmithidae, posiblemente Hexamermis sp. y el hongo Nomureae rileyl. En esta evaluación se determinó que M. Iaphygmae está presente en las zonas de EI Espinal y Nariño. Las larvas de S. frugiperda parasitadas por M. laphygmae murieron en los instares IV, V, VI Y VII. En los adultos de este agente de control se encontró la relación de sexos 1,5: 1 (1,5 hembras por cada macho. AI compararse con los otros enemigos naturales encontrados en el estudio, al M. Iaphygmae mostró los mayoras promedios de parasitismo para controlar a S. frugiperda en las dos zonas y en los dos cultivos, siendo por

  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. 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

  1. 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

  2. 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

  3. 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)

  4. 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)

  5. 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

  6. 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

  7. 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

  8. 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.

  9. 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.

  10. Inseticidas para o controle da traça-das-crucíferas e impactos sobre a população natural de parasitóides Insecticide evaluation for control of the diamondback moth and impact on natural populations of parasitoids associated with diamondback moth

    Directory of Open Access Journals (Sweden)

    Geni L. Villas Bôas

    2004-12-01

    Full Text Available A traça-das-crucíferas (TDC Plutella xylostella (Lepidoptera: Yponomeutidae é a principal praga da cultura do repolho e seu controle é feito através de inseticidas, com possíveis efeitos adversos na população natural dos seus parasitóides. Nos últimos anos, novos ingredientes ativos foram colocados no mercado, tornando necessária a avaliação da eficiência destes produtos e o impacto na população de parasitóides. Com este objetivo, foi instalado um experimento, de junho a outubro de 2001, na área experimental da Embrapa Hortaliças, com a cultivar Kenzan. Foram utilizados os produtos Spinosad (38,4 g i.a./ha, Thiacloprid (96 g i.a./ha, Indoxacarb (24 g i.a./ha, Bacillus thuringiensis var. kurstaki (16,8 g i.a./ha, uma nova cepa (S764, concentração de esporos 4 x 10 E 9 de B. thuringiensis (168 g i.a./ha, disponibilizada para teste pela Embrapa Recursos Genéticos e Biotecnologia e uma testemunha, sem pulverização. As pulverizações, num total de oito, foram semanais, iniciando-se a partir da formação das cabeças de repolho, quatro semanas após o transplante. Foram efetuadas amostragens semanais em cinco plantas por parcela, contando-se o número de furos e larvas nas quatro folhas centrais da cabeça do repolho. Avaliou-se também o número de larvas na parte externa da cabeça do repolho. A cada 15 dias foram efetuadas coletas de larvas (folhas centrais e externas, que eram levadas ao laboratório para avaliação de parasitismo. Por ocasião da colheita, as cabeças foram avaliadas quanto ao valor comercial, através de notas e porcentagem de cabeças comerciais, além da contagem do número de furos, larvas na cabeça e larvas na planta toda. Os produtos Spinosad, Indoxacarb e B. thuringiensis var. kurstaki foram os mais eficientes para o controle de P. xylostella e não diferiram entre si para os parâmetros avaliados. A utilização desses produtos propiciou a produção de cabeças de repolho com alto padr

  11. 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.

  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. Análisis exploratorio de firmas espectrales e índices de vegetación para la monitorización de emisiones de CO2 en un análogo natural.

    OpenAIRE

    Gutiérrez del Olmo, Jorge; Garcia Rodriguez, Rafael; Iglesias Martínez, Luis; Vega Panizo, Rogelio de la; Rincones Salinas, Miguel Ángel

    2013-01-01

    Se ha analizado el problema de la detección de fugas de CO2 en reservorios naturales utilizados como almacenes de este gas. Los trabajos han sido realizados sobre un área del Campo de Calatrava, Ciudad Real, España, donde a causa de la actividad volcánica remanente se pueden encontrar puntos de emisión de CO2. Se han utilizado imágenes QuickBird y WorldView-2 para la generación de firmas espectrales e índices de vegetación. Estos índices han sido evaluados para obtener los más idóneos para la...

  14. 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)

  15. 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

  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. Diseño y contrucción de una herramienta tecnológica basada en técnicas de procesamiento de lenguaje natural y aprendizaje automático para clasificación de correos de una entidad bancaria

    OpenAIRE

    González Herrero, Daniela

    2017-01-01

    El objetivo del proyecto es diseñar una aplicación tecnológica basada en el Procesamiento de Lenguaje Natural y algoritmos estadísticos de Aprendizaje Automático para clasificar de forma automatizada correos de clientes corporativos en una Entidad Bancaria. Actualmente el proceso de clasificación de los correos que envían los clientes corporativos es realizado por 14 operarios, y diariamente se reciben alrededor de 7000 correos, el equipo de operarios debe leer cada correo y en función de su ...

  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. 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

  20. Definición de una metodología para la construcción de Sistemas de Organización del Conocimiento a partir de un corpus documental en Lenguaje Natural

    OpenAIRE

    Sánchez Cuadrado, Sonia; Morato Lara, Jorge; Moreiro González, José Antonio; Marrero Llinares, Mónica

    2007-01-01

    Se propone una metodología para la construcción automatizada de KOS adaptable a diferentes entornos a partir de un corpus documental y unas aplicaciones de tratamiento textual que soporten todo el proceso de construcción y mantenimiento automatizado del KOS. Esta metodología se ha aplicado a diferentes entornos reales, comprobando que se trata de una metodología adaptable y obteniendo una reducción significativa de la intervención de expertos del dominio. A methodology to au...

  1. 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...

  2. 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)

  3. 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.

  4. 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

  5. LA MODELIZACIÓN COMO ESTRATEGIA DIDÁCTICA PARA EL RECONOCIMIENTO DEL PATRIMONIO CULTURAL Y NATURAL DEL MUNICIPIO DE FLORESTA (BOYACÁ EN LOS ESTUDIANTES DEL COLEGIO TÉCNICO HÉCTOR JULIO RANGEL QUINTERO

    Directory of Open Access Journals (Sweden)

    Laura Melissa Gutiérrez Rodríguez

    2014-05-01

    Full Text Available Presentamos la propuesta de la práctica pedagógica desarrollada en el Colegio Héctor Julio Rangel Quintero del  Municipio de Floresta (Boyacá con una duración de seis meses y bajo los lineamientos del Grupo de Investigación Conocimiento Profesional del Profesor de Ciencias de la Universidad Pedagógica Nacional (Bogotá-Colombia. La investigación se centró  en las  estrategias que utilizan los maestros en la modelización para la enseñanza  de la Biología en los espacios académicos,  permitiendo de  a los docentes y estudiantes  reflexionar sobre su labor y así mejorar  las falencias y fortalecer sus cualidades,  y de esta forma “propiciar la meta-reflexión de los profesores acerca de su conocimiento docente con el fin de fortalecer su identidad profesional, (Valbuena, 2009: 3, para ello el proceso investigativo se constituyó a partir de la perspectiva cualitativa, con un enfoque interpretativo donde se empleó diferentes instrumentos de recolección de información. Finalmente se muestra las conclusiones más relevantes arrojadas por la investigación de la práctica pedagógica.

  6. ¿Medicina natural y tradicional en psicología? Aplicación de los contenidos de medicina natural y tradicional al programa de la asignatura psicología médica para estudiantes de tercer año de medicina Natural and traditional medicine in psychology? Use of the natural and traditional medicine contents in the syllabus of medical psychology for 3rd academic year medical students

    Directory of Open Access Journals (Sweden)

    Yolanda Fuertes Porbén

    2007-06-01

    Full Text Available El presente artículo comprende una propuesta de inserción de contenidos referentes a la Medicina Natural y Tradicional en el programa de la asignatura Psicología Médica II debido a la importancia que se le concede a este método alternativo de tratamiento. Se hace referencia a temas como la Medicina Tradicional China (Acupuntura, Fitoterapia, Tai-Chi y el empleo de los contenidos de los mismos en los tratamientos de algunos síntomas como el estrés, la ansiedad y la depresión, considerando siempre que esta vinculación ofrece mayor información y conocimientos al médico general integral , sirve de complemento a la asignatura Medicina Natural y Tradicional incluida en los programas de la carrera de Medicina y funciona como una contribución al desarrollo del carácter científico de la enseñanza, la relación de la teoría con la práctica y la asequibilidad; principios fundamentales de la pedagogía imprescindibles en el proceso docente - educativo.In the present article it is proposed to insert the contents concerning Natural and Traditional Medicine in the Syllabus of Medical II Psychology, due to the importance that this alternative treatment method has. Themes as Chinese Traditional Medicine (Acupuncture , Phytotherapy and Tai-Chi are referred to, as well as the use of these contents in the treatments of some symptoms like stress , anxiety and depression, taking always into account that this link provides more information to the comprehensive doctor and is useful as a complement to the Natural and Traditional Medicine Subject which is now included in the Syllabus of Medicine and it contributes to the development of the scientific teaching , the relationship between theory and practice, which are the essential principles of Education.

  7. 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.

  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. 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.

  10. 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.

  11. Uranium prospecting program: memorandum of request United Nations Assistance Rotatory Fund for Naturals resources in Uranium Prospecting; Programa prospeccion Uranio: memorando de solicitud de asistencia al fondo Rotatorio de Naciones Unidas para el estudio de los Recursos Naturales para la prospeccion de Uranio

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1976-07-01

    The Uruguayan government required assistance to Unit Nations funds with the aim of studies the Natural resources in Uranium prospecting, their antecedent, actual and projected works, equipment and end considerations.

  12. Estrategias para negociaciones exitosas.

    OpenAIRE

    José B. Parra V; Evelinda Santiago J.; Misael Murillo M.; Candy Atonal N.

    2010-01-01

    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....

  13. Natural gas

    Energy Technology Data Exchange (ETDEWEB)

    Fraser, J W

    1967-08-01

    This report on the natural gas industry of Canada includes: composition and uses of natural gas, production statistics, exploration and development, reserve estimates, natural gas processing, transportation, and marketing. For the Canadian natural gas industry, 1966 was a year of moderate expansion in all phases, with a strong demand continuing for sulfur and liquid hydrocarbons produced as by-products of gas processing. Value of natural gas production increased to $199 million and ranked sixth in terms of value of mineral ouput in Canada. Currently, natural gas provides over 70% of Canada's energy requirements. Proved remaining marketable reserves are estimated to be in excess of a 29-yr supply.

  14. Use of ultrasound radiation for extraction of bioactive compounds from natural sources. Current events and perspectives; Empleo de la radiacion ultrasonica para la extraccion de compuestos bioactivos provenientes de fuentes naturales. Estado actual y perspectivas

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Riera, Zalua [Instituto Superior de Tecnologia y Ciencias Aplicadas (INSTEC), La Habana (Cuba); Robaina Mesa, Malvis [Centro de Investigacion y Desarrollo de Medicamentos, La Habana (Cuba); Jauregui Haza, Ulises, E-mail: zalua@instec.cu [Instituto Superior de Tecnologia y Ciencias Aplicadas (INSTEC), La Habana (Cuba)

    2014-07-01

    In recent years, clean technologies have been developed for high efficiency extracting of isolation of biologically active compounds from natural sources, without the loss of biological activity, with good yield and high purity. Ultrasound-assisted extraction has low instrumental requirements and their implementation is very appropriate where the stability of the active component to be removed is affected by the high temperatures of conventional processes. In this paper it is evaluated the state of the art of ultrasound-assisted extraction of bioactive compounds from various natural sources, its mechanism, the parameters governing its use and research perspectives in this field. Ultrasonic cavitation phenomenon promotes cell wall rupture, reduction of particle size and tissue permeability, which facilitates the diffusion of the solvent into the inert part of the plant material and increasing the mass transferred through membranes. This mechanism explains the high efficiency of ultrasound-assisted extraction as it allows to reduce the time, temperature and amounts of solvent extraction process with high yields and high purity of the extracted product. Currently there is a great demand for the use of ultrasound to industrial and current research lead to the development of larger scale reactors and the theoretical modeling of the parameters that determine efficient extraction.

  15. 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)

  16. Subvenciones para instituciones Directrices para gastos de ...

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

    IDRC CRDI

    División de Administración de Subvenciones ... En la Parte 2 del Acuerdo de Subvención estándar de IDRC se incluyen los límites ... pagar los costos de sustitución (tiempo libre para personal académico) de los investigadores principales.

  17. Natural Gas

    OpenAIRE

    Bakar, Wan Azelee Wan Abu; Ali, Rusmidah

    2010-01-01

    Natural gas fuel is a green fuel and becoming very demanding because it is environmental safe and clean. Furthermore, this fuel emits lower levels of potentially harmful by-products into the atmosphere. Most of the explored crude natural gas is of sour gas and yet, very viable and cost effective technology is still need to be developed. Above all, methanation technology is considered a future potential treatment method for converting the sour natural gas to sweet natural gas.

  18. 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.

  19. 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.

  20. Disposição em aterros controlados de resíduos sólidos industriais não-inertes: avaliação dos componentes tóxicos e implicações para o ambiente e para a saúde humana Non-inert industrial solid waste disposal in landfill dumps: evaluation of toxicity and implications for the environment and human health

    Directory of Open Access Journals (Sweden)

    Cristina L. S. Sisinno

    2003-04-01

    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.According to Brazilian recommended technical procedures (mainly NBR 10,004, solid waste must be previously classified in order to be disposed of adequately. Non-inert industrial solid waste is being dumped in landfill areas, most of which operate inefficiently and are located near the population and important ecosystems. In order to evaluate the potential toxicity of solid waste produced by various types of industries, 21 samples were analyzed according to NBR 10,004 procedures. Of these, 18 were classified as non-inert solid waste. The main substances contributing to the classification of these samples as non-inert waste were: aluminum, iron, manganese, phenol, and surfactants. Aluminum, manganese, and phenol are the main toxicologically relevant substances for human and environmental health because they can alter the quality of groundwater

  1. 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.

  2. 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.

  3. 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.

  4. 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)

  5. Natural interfaces for interacting with a virtual control desk of a nuclear power plant simulator; Interfaces naturais para interacao com uma mesa de controle virtual de um simulador de uma usina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Aghina, Mauricio Alves da Cunha e

    2012-07-01

    Due to very strict standards of safe operation of a nuclear power plant operators must be well trained so they can operate it within the necessary safety procedures. This is done through training simulators, which enable the user operation, as close as possible to the real control desk, and can be inserted accident situations, so they train, how to return the plant to a normal operating condition. Normally is used two types of simulator. Preferred is the full scope simulator, what is a computational dynamics program of the plant used in conjunction with a physical replica of the control desk, but this type of simulator involves a high construction cost. The second type is what uses synoptic windows of various regions of the original control desk, its construction cost is smaller, but it have a little fidelity to the original appearance of the table. Currently, with the use of virtual reality, control desks can be modeled in 3D, making the simulator interface is very similar to the appearance of the real control desk with a low cost construction. This work shows the use of natural interfaces for operator interaction with the virtual control desk, in order that it does not use any mechanical device for displaying and acting with it. For procedures that were used, such as: computer vision to recognize the position of the operator's and observation of their hands to the work of the desk controls and voice recognition. (author)

  6. 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

  7. Risco de vida e natureza do SAMU: demanda não pertinente e implicações para a enfermagem Riesgo de vida y naturaleza del SAMU: perspectivas de los usuarios e implicaciones para la enfermería Life risk and nature of SAMU: users' perspectives and implications for nursing

    Directory of Open Access Journals (Sweden)

    Andréa Márian Veronese

    2012-12-01

    Full Text Available O artigo faz um recorte na análise realizada em um estudo qualitativo, desenvolvido em 2009, cujo objetivo foi investigar a demanda de pedidos de socorro ao Serviço de Atendimento Móvel de Urgência/Porto Alegre (SAMU, por ele classificada como não pertinente. As informações foram obtidas em 16 entrevistas semiestruturadas, realizadas com os solicitantes desta demanda, utilizando-se, como orientação metodológica, a Teoria Fundamentada nos Dados. O artigo aborda o conteúdo da subcategoria "Entrando em conflito com a regulação do SAMU na avaliação do risco de vida", enfocando as divergências entre a regulação e a percepção dos usuários sobre o funcionamento do serviço e significado de "risco de vida", fatores implicados na construção da demanda não pertinente. A importância da Enfermagem, neste cenário, está na sua competência para realizar ações de educação em primeiros socorros e para participar de projetos intersetoriais capazes de intervir em situações geradoras de vulnerabilidade.El artículo hace un corte del análisis en un estudio cualitativo desarrollado en 2009 cuyo objetivo fue investigar la demanda de pedidos de socorro al Servicio de Atendimiento Móvil de Urgencia/Porto Alegre (SAMU que la clasificó como no pertinente. Las informaciones resultaron de 16 entrevistas semiestructuradas con los sujetos de esta demanda, utilizándose como orientación metodológica la Teoría Fundamentada. El artículo aborda el contenido de la subcategoría "Entrando en conflicto con la regulación del SAMU en la evaluación del riesgo de vida", enfocando las divergencias entre la regulación y la percepción de los usuarios acerca del funcionamiento del servicio y significado de "riesgo de vida", factores implicados en la construcción de la demanda no pertinente. La Enfermería se destaca en este escenario por su competencia en realizar acciones de educación sobre primeros socorros y participar de proyectos

  8. 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)

  9. Mitos da didática das ciências acerca dos motivos para incluir a Natureza da Ciência no ensino das ciências Science Education myths about the reasons to include the Nature of Science in science teaching

    Directory of Open Access Journals (Sweden)

    J. A. Acevedo

    2005-04-01

    Full Text Available Em certas situações, a Didática das Ciências transmite como mitos algumas crenças que não estão suficientemente sustentadas pela investigação que ela própria produz. Este artigo mostra dois desses mitos relacionados com os motivos que se costumam apontar para incluir a Natureza da Ciência no ensino das ciências, como sejam a suposta relação entre a prática docente e as crenças sobre a Natureza da Ciência, e a crença de que a sua compreensão é um fator chave na hora de tomar melhores decisões cívicas em questões tecnocientíficas de interesse social. A análise que se apresenta realizou-se mediante a revisão de diversos resultados de investigações procedentes da própria Didática das Ciências e também da Psicologia das Decisões. A conclusão aponta para considerar que outros fatores influenciam mais, tornando muito menos lineares essas hipotéticas relações do que alguns especialistas pensam e mais complexa a problemática abordada.In some situations Science Education transmits as myths various beliefs as myths that are not enough sustained by the research in its own domain. This paper shows two of these myths related to the reasons usually pointed in orderfor includinge the Nature of Science in science teaching:, such as the supposed relationship between the educational practice and the beliefs about the Nature of Science, and also the belief that its understanding of the Nature of Science is a key factor in when making better civicdecisions as citizens in technical socioscientific oscientific issues. with social interest The analysis was carried out by means of athe review of several results from the own Science Education Research, and also from the Psychology of Decisions. The conclusion seems to be clear: other factors are of a greater influence, making those hypothetical relations much less linear than some experts wcould think, and making the questions much more complex. the presented question.

  10. 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

  11. 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)

  12. 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...

  13. 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 ...

  14. 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 exempl...... 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....

  15. 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.

  16. 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)

  17. 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.

  18. 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.

  19. 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.

  20. Análisis genético para la identificación de niños apropiados: construcción política y científica de la "naturaleza" y el parentesco Genetic analysis aimed at the identification of appropriated children: political and scientific construction of "nature" and kinship

    Directory of Open Access Journals (Sweden)

    Sabina Amantze Regueiro

    2010-04-01

    Full Text Available En este artículo se reflexiona en torno a los análisis genéticos para la identificación de niños apropiados durante la última dictadura militar argentina. Para ello se consideran las discusiones sobre la dicotomía naturaleza-cultura, abordando el parentesco como una construcción política a partir de la acción de búsqueda de Abuelas de Plaza de Mayo, en su promoción de técnicas científicas para el "descubrimiento" del vínculo biológico. En este sentido, se estudian también las formas de construcción jurídica de las familias conectadas a la identificación; la constitución posterior de relaciones familiares, así como ciertos efectos sociales que las trascienden. De esta forma, se argumentará que aún en los casos en los cuales el parentesco parece agotarse en el vínculo de sangre, lo biológico no existe por fuera de las prácticas sociales y simbólicas.This article deals with the genetic analysis aimed at the identification of children appropriated during the last Argentine military dictatorship. For this purpose, the discussions on the nature-culture dichotomy are considered, with an approach to kinship as a political construction from the searching action of Abuelas de Plaza de Mayo (Grandmothers, promoting scientific techniques for the "discovery" of the biological bond. In this sense, the forms of legal construction of families connected to the identification; the subsequent constitution of family relationships, as well as certain social effects that transcend them are also studied. In this way, it will be argued that even in cases in which kinship seems to come to an end in the blood bond, the biological aspect does not exist beyond the social and symbolic practices.

  1. Natural products use for protection of seedling in planting trees Uso de produtos naturais para proteção de mudas na arborização de pastagens

    Directory of Open Access Journals (Sweden)

    Valéria Cristina Zago

    2008-04-01

    Full Text Available Conventional productive systems have depleted environmental resources and weakened unsustainable agroecosystems. Silvopastoral systems can be a viable alternative for the recovery of degraded areas. The objective of this experiment was to evaluate natural products used to protect seedlings in planting trees in pastures which the cattle is permanently grazing and the seedlings have no mechanical restraint to keep the cattle away. The experiment was conducted at “Embrapa Gado de Corte”, Mato Grosso do Sul State, Brazil, from February 2nd 2005 to March 28th 2005. The statistical design employed was the split-plot random design, with ten replications. The following treatments were given to the plots: 1 cattle manure around the tree seedlings; 2 dried bovine blood; 3 crushed egg shells; and 4 no protection (control. The subplots contained five tree species: Myroxylon peruiferum (Bálsamo, Dipteryx alata (Cumbaru, Schizolobium parahyba (Guapuruvu, Genipa americana (Jenipapo and Mimosa caesalpineaefolia (Sansão do campo. Herbivory was intense for all treatments. The survival rate of S. parahyba was 72.5%, and 100% of M. caesalpineafolia died. Cattle manure produced the best results, with partial protection of tree seedlings. Application of egg or blood did not offer any protection to the young trees. The concentration and frequency of application of manure for seedling protection deserves further attention.Os sistemas de produção convencional têm esgotado os recursos ambientais, o que torna o agroecossistema frágil e insustentável. Sistemas silvipastoris podem ser alternativas viáveis na recuperação de pastagens degradadas. Este estudo foi desenvolvido com o objetivo de avaliar produtos naturais na implantação de espécies arbóreas em pastagens com presença constante de bovinos, sem proteção das mudas. O experimento foi conduzido na Embrapa Gado de Corte, Campo Grande, MS, no período de 02/02/2005 a 28/03/2005. O delineamento

  2. 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…

  3. Natural radiation

    International Nuclear Information System (INIS)

    Feliciano, Vanusa Maria Delage

    2016-01-01

    Cosmic radiation, as well as cosmogenic radiation, terrestrial radiation, radon and thorium are introduced in this chapter 3. The distribution of natural radiation sources is treated, where the percentage distribution of the contribution relative to exposure to radiation from natural and artificial sources is also included

  4. 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

  5. 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....

  6. Soil organisms associated to the weed suppressant Crotalaria juncea (fabaceae and its importance as a refuge for natural enemies Organismos de solo associados à supressora de plantas daninhas Crotalaria juncea (fabaceae e sua importância como refúgio para inimigos naturais

    Directory of Open Access Journals (Sweden)

    W.S Tavares

    2011-09-01

    Full Text Available Soil organisms play an important role in organic crops of Crotalaria juncea (Fabaceae and are associated with the natural conservation of the environment. The present study was aimed to investigate the population of soil organisms in the organic culture of C. juncea, as well as its importance as a refuge for natural enemies. Dalbulus maidis (Hemiptera: Cicadellidae, Diabrotica sp. (Coleoptera: Chrysomelidae, Doru luteipes (Dermaptera: Forficulidae, Gryllus assimilis (Orthoptera: Gryllidae, Lagria villosa (Coleoptera: Lagriidae, Melanotus sp. (Coleoptera: Elateridae, Meloidogyne incognita (Tylenchida: Heteroderidae, Nephila clavipes (Araneae: Nephilidae, Orius insidiosus (Hemiptera: Anthocoridae, Pheidole sp. (Hymenoptera: Myrmicidae, Phyllophaga sp. (Coleoptera: Scarabeidae, Procornitermes sp. (Isoptera: Termitidae, Solenopsis sp. (Hymenoptera: Formicidae, and Utetheisa ornatrix (Lepidoptera: Arctiidae were identified in C. juncea. The organisms that were found during a 3-month period in 144 trenches in C. juncea were pest species (84.47% and natural enemies (15.53% as well. Natural enemies had an average of 11.89 individuals per 1.08 m³ of soil cultivated with C. juncea. The abundance of organisms in the pod stage (5.49% of C. juncea was lower than that in the vegetative (83.50% and flowering (11.01% stages. Crotalaria juncea plants can be used as part of a crop system for Integrated Pest Management.Organismos de solo desempenham um importante papel em cultivos orgânicos de Crotalaria juncea (Fabaceae e estão associados com a conservação natural do ambiente. O presente estudo teve como objetivo investigar a população de organismos de solo no cultivo orgânico de C. juncea, bem como sua importância como um refúgio para inimigos naturais. Dalbulus maidis (Hemiptera: Cicadellidae, Diabrotica sp. (Coleoptera: Chrysomelidae, Doru luteipes (Dermaptera: Forficulidae, Gryllus assimilis (Orthoptera: Gryllidae, Lagria villosa (Coleoptera

  7. 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)

  8. 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)

  9. Radiation protection program applied to occupationally exposed individuals at the IPEN/CNEN-SP pilot plant in the 1980s for natural uranium compounds; Programa de radioproteção aplicado aos indivíduos ocupacionalmente expostos na usina piloto do IPEN-CNEN/SP na década de 80 para compostos de urânio natural

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Teresinha de Moraes da; Sordi, Gian Maria A.A.; Vasques, Francisco Mário Feijó, E-mail: tmsilva@ipen.br [Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP), São Paulo, SP (Brazil)

    2017-07-01

    The work evidences the chemical processing of natural uranium from the yellowcake phase to the production of UF{sub 6} natural uranium hexafluoride, a process carried out at the IPEN/CNEN-SP pilot plant. Radiation protection management was intended to monitor occupationally exposed individuals - IOEs, the workplace and the environment. An individual monitoring program for IOEs was developed for both external irradiation and incorporation of radioactive material. The IOEs were monitored externally with film-type dosimeters and the in vitro method was applied internally for urine analysis. For the workplace the monitoring program for equipment and floors was developed, determining the exposure rate from the process equipment, surface contamination expressed in Bq.cm{sup -2} in equipment and floors, complemented by the air monitoring program both for the worker as well as for the workplace. Cellulose filters with aerodynamic diameter of 0.3 micron to 8.0 micron were used.

  10. 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)

  11. A competência da união para a elaboração de "plano nacional das atividades de exploração de petróleo e gás natural" no Brasil The competence of the confederation to elaborate the "national plan for petroleum and natural gas exploration activities" in Brazil

    Directory of Open Access Journals (Sweden)

    Rodrigo Machado Vilani

    2010-06-01

    Full Text Available O trabalho visa traçar as premissas básicas para a elaboração de um plano diretor nacional, tendo por escopo a orientação e o planejamento intertemporal da exploração dos campos petrolíferos brasileiros. Esse instrumento parte do reconhecimento do impacto ambiental do esgotamento dos reservatórios pelas atividades de exploração. A proposta procura fortalecer os instrumentos legais existentes e as políticas públicas de fontes alternativas de energia.The aim of this study is to lay down the basic premises of a national master plan, whose scope is to guide the intertemporal planning of the exploration of Brazilian oilfields. One purpose of this instrument is to acknowledge the environmental impact of the depletion of supplies by exploitation activities. The proposal also aims to strengthen the existing legal instruments and public policies for alternative energy sources.

  12. Natural radiation; A radiacao natural

    Energy Technology Data Exchange (ETDEWEB)

    Feliciano, Vanusa Maria Delage

    2016-07-01

    Cosmic radiation, as well as cosmogenic radiation, terrestrial radiation, radon and thorium are introduced in this chapter 3. The distribution of natural radiation sources is treated, where the percentage distribution of the contribution relative to exposure to radiation from natural and artificial sources is also included.

  13. 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...

  14. Sciences & Nature

    African Journals Online (AJOL)

    AFRICAN JOURNALS ONLINE (AJOL) · Journals · Advanced Search · USING AJOL ... Sciences & Nature, the Scientific Journal edited by the University of ... Subjects covered include agronomy, sciences of the earth, environment, biological, ...

  15. Pluralising Nature

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2017-01-01

    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......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...

  16. 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.

  17. 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.

  18. 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

  19. 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.

  20. 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)

  1. 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)

  2. 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...

  3. 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

  4. 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...

  5. Para-Hermitian and para-quaternionic manifolds

    International Nuclear Information System (INIS)

    Ivanov, S.; Zamkovoy, S.

    2003-10-01

    A set of canonical para-Hermitian connections on an almost para-Hermitian manifold is defined. A Para-hermitian version of the Apostolov-Gauduchon generalization of the Goldberg-Sachs theorem in General Relativity is given. It is proved that the Nijenhuis tensor of a Nearly para-Kaehler manifolds is parallel with respect to the canonical connection. Salamon's twistor construction on quaternionic manifold is adapted to the para-quaternionic case. A locally conformally hyper-para-Kaehler (hypersymplectic) flat structure with parallel Lee form on the Kodaira-Thurston complex surfaces modeled on S 1 x SL (2, R)-tilde is constructed. Anti-self-dual locally conformally hyper-para-Kaehler (hypersymplectic) neutral metrics with non vanishing Weyl tensor are obtained on the Inoe surfaces. An example of anti-self-dual neutral metric which is not locally conformally hyper-para-Kaehler (hypersymplectic) is constructed. (author)

  6. Para-Hermitian and para-quaternionic manifolds

    Energy Technology Data Exchange (ETDEWEB)

    Ivanov, S [University of Sofia ' St. Kl. Ohridski' , Faculty of Mathematics and Informatics, Sofia (Bulgaria) and Abdus Salam International Centre for Theoretical Physics, Trieste (Italy); Zamkovoy, S [University of Sofia ' St. Kl. Ohridski' , Faculty of Mathematics and Informatics, Sofia (Bulgaria)

    2003-10-01

    A set of canonical para-Hermitian connections on an almost para-Hermitian manifold is defined. A Para-hermitian version of the Apostolov-Gauduchon generalization of the Goldberg-Sachs theorem in General Relativity is given. It is proved that the Nijenhuis tensor of a Nearly para-Kaehler manifolds is parallel with respect to the canonical connection. Salamon's twistor construction on quaternionic manifold is adapted to the para-quaternionic case. A locally conformally hyper-para-Kaehler (hypersymplectic) flat structure with parallel Lee form on the Kodaira-Thurston complex surfaces modeled on S{sup 1} x SL (2, R)-tilde is constructed. Anti-self-dual locally conformally hyper-para-Kaehler (hypersymplectic) neutral metrics with non vanishing Weyl tensor are obtained on the Inoe surfaces. An example of anti-self-dual neutral metric which is not locally conformally hyper-para-Kaehler (hypersymplectic) is constructed. (author)

  7. 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.

  8. Nature's Palette

    Science.gov (United States)

    McBride, Brooke B.; Brewer, Carol A.

    2010-01-01

    Flower petals, acorn hats, exoskeletons of beetles, and lichens are just a few of the objects students may find in a surprising array of vivid colors. These tiny examples from nature's palette can be discovered in a school yard, a park, or even along the edges of a paved sidewalk...it simply takes careful observation! This article describes a…

  9. 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:

  10. 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:

  11. 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 ...

  12. 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...... -- Cows, red cows, and red herrings -- Corollarial and theorematic experiments with diagrams -- Strategies of research: Peirce's enlightenment maxims -- Perspective -- References -- Index....

  13. 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:

  14. 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....

  15. 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 ...

  16. 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 ...

  17. 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.

  18. 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)

  19. Evaluation of a system of refrigeration with absorption cycle using the direct burning of natural gas for tropical fruits storage; Avaliacao de um sistema de refrigeracao com ciclo de absorcao utilizando a queima direta de gas natural para armazenamento de frutas tropicais

    Energy Technology Data Exchange (ETDEWEB)

    Bartolomeu, Lair S.; Torres, Ednildo A. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola Politecnica. Lab. de Energia e Gas; Silva, Gabriel F. [Universidade Federal de Sergipe (UFS), Aracaju, SE (Brazil); Martins, Ronaldo M. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Materiais. CQDM; Campos, Michel F. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Gerencia de Tecnologia do Gas Natural. Rede GasEnergia

    2004-07-01

    This work has the purpose to analyze an alternative method in the conservation of tropical fruits in chamber cooled through the technology of use of the natural gas as energy source. The study it was carried through in chiller of absorption, Robur model, of 5TR, which meets in the campus of the Federal University of Sergipe (UFS/LEG). The energy analysis had as objective to study the process involving the cycle and its components. Of the analysis of first law was gotten a power of refrigeration of 8,8 kW and a COP=0,32 and the analysis of second law {beta}=0,29. The exergetic analysis had for intention to evaluate the amount and the quality of the energy in the system. The heat generator was the component that presented the biggest irreversibility, whose relation with the total irreversibility was about 70%. In the absorber the lesser exergetic efficiency was verified. Project is supported by the GasEnergia/PETROBRAS. (author)

  20. 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)

  1. 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)

  2. 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

  3. 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...... in understanding recent and current practices of climate change and environmental policy. The different chapters in this volume contribute to this debate by offering multidisciplinary perspectives on particular aspects of these two frameworks and through a multidirectional outlook that links the local, national...

  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. 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.

  6. 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.

  7. Universidades accesibles para todos

    Directory of Open Access Journals (Sweden)

    Roxana Stupp Kupiec

    2001-01-01

    Full Text Available Este trabajo pretende hacer conciencia sobrelos factores que inciden en la construcción colectiva deuniversidades dispuestas a innovar y transformar suideología, sus políticas, el currículum, los servicios estu-diantiles, la infraestructura física y administrativa y lasestrategias de comunicación e información, bajo el para-digma de la accesibilidad en el entorno. Se hace referen-cia al marco legal internacional y nacional que orientalas acciones que deben planificarse e implementarse enlas instituciones de Educación Superior.En la construcción de universidades accesibles para to-dos se requiere de un cambio en la concepción curricu-lar. Se analizan conceptos como la flexibilidad en la for-mación y el acceso a los planes de estudio para respondera las necesidades educativas de todos los estudiantes. Para promover estas transformaciones se proponen prin-cipios y prácticas tales como la interdisciplinareidad y lainclusión del tema de la discapacidad en todas las carre-ras. Además, se presentan ejemplos de aplicación en dife-rentes áreas del perfil profesional, en la formación deldocente universitario y en actividades de proyección so-cial, vida estudiantil e investigación. En el ámbito estu-diantil, se describen algunos servicios y procesos que sehan desarrollado en la Universidad de Costa Rica

  8. 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.

  9. 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.

  10. 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

  11. 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

  12. 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.

  13. 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.

  14. Estudio de factibilidad para la creación de una empresa productora y exportadora de jugo natural de sandía destinada al mercado colombiano, ubicada en el barrio de Carcelén al norte del Distrito Metropolitano de Quito

    OpenAIRE

    Méndez Posligua, Daniela Cristina

    2011-01-01

    Nuestra planta tendrá lugar en el norte del distrito metropolitano de Quito, y produciremos un jugo proveniente de la Sandia para después exportarlo a la ciudad de Bogotá en Colombia. Por la cercanía de nuestro mercado objetivo, el Incoterm que hemos determinado para la transacción es FCA. Nuestros clientes potenciales serán principalmente nuestros importadores quienes son los supermercados para que posterior a esto distribuyan a las tiendas a los alrededores de la ciudad destino.

  15. 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

  16. 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.

  17. Ha vuelto para mirarnos

    OpenAIRE

    Casalderrey, Francisco

    2008-01-01

    En cada entrega analizaremos un cuadro, mirándolo con ojos matemáticos. Con esa particular mirada, fruto de nuestra propia (de)formación. Y desde ese punto de vista haremos paseos por el arte y las matemáticas. Espero que el lector, como hago yo mismo, disfrute descubriendo más allá de lo que a simple vista distinguiría cualquiera. Al fin de cuentas, el arte, como las matemáticas, han sido creados para hacernos disfrutar.

  18. Interfaces para control cerebral

    OpenAIRE

    Spinelli, Enrique Mario

    2000-01-01

    La función de una interfaz para control cerebral basada en señales de electroencefalograma (EEG), en forma general denominada BCI (Brain control Interface), es establecer un enlace directo entre el cerebro y una máquina, sin utilizar acciones motoras directas. Una BCI permite realizar operaciones simples a partir de la interpretación de las señales de EEG. Su desarrollo está principalmente orientado hacia la ayuda a personas con discapacidades motoras severas, que poseen deterioros en el sist...

  19. Comunicar para la salud

    Directory of Open Access Journals (Sweden)

    Lic. Eva Bocco

    1998-01-01

    Full Text Available Con este trabajo quiero plantearles una inquietud en torno al rol que nos cabe a los comunicadores en el área de la salud desde la perspectiva de la comunicación para la salud. ¿Se puede pensar la salud pública desvinculada de la comunicación? ¿La comunicación es posible sin la existencia de salud en la comunidad? ¿Qué puede hacer un comunicador en el ministerio de salud? ¿Puede un estado desarrollar políticas de salud sin la presencia de la comunicación?

  20. 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.

  1. Democracia para ciudadanos ciborgs

    OpenAIRE

    Juan Varela

    2007-01-01

    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.

  2. Natural games

    Science.gov (United States)

    Anttila, Jani; Annila, Arto

    2011-10-01

    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.

  3. 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

  4. Next nature : nature changes along with us

    NARCIS (Netherlands)

    Mensvoort, van K.M.; Grievink, H.J.

    2011-01-01

    We debate saving nature, we dream about escaping to nature, but rarely do we ask "What is nature?". The Next Nature book radically shifts your notion of nature. Where technology and nature are traditionally seen as opposed, they now appear to merge or even trade places. With our urge to design our

  5. 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

  6. 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.

  7. 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.

  8. Serie: Madera para construcción Acabados para madera

    OpenAIRE

    Sáenz-Muñoz, Marta; Instituto Tecnológico de Costa Rica

    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...

  9. "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.

  10. 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.

  11. 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.

  12. 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.

  13. Avaliação da influência de surfactantes químico e biológico na hidrólise enzimática de casca de coco verde após pré-tratamento ácido/alcalino e com peróxido de hidrogênio alcalino

    OpenAIRE

    Araújo, Cynthia Kérzia Costa de

    2016-01-01

    “No Brasil são gerados diversos tipos de subprodutos e resíduos agroindustriais como: bagaço de pedúnculo de caju, bagaço de cana-de-açúcar, bagaço de coco e outros. A disposição final desses resíduos, ou seja, sua eliminação causa sérios problemas ambientais. Apesar de uma parte ser utilizada para fins diversos, uma grande quantidade ainda permanece sem utilização. Neste sentido, os resíduos de conteúdo lignocelulósico, como a casca do coco verde, constituem uma matéria-prima renovável e abu...

  14. 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.)

  15. 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 ......

  16. Estudio de factibilidad para la importación desde el Perú y comercialización de capsulas de Maca (producto natural que mejora el rendimiento físico y optimiza la capacidad intelectual) en la ciudad de Quito.

    OpenAIRE

    Moran Mena, Adriana Estefania

    2011-01-01

    El presente trabajo fue elaborado con el fin de plantea un Plan de Negocios para la creación de una empresa que se dedique a la Importación y Comercialización de la Maca en Quito - Ecuador. Inicialmente, realizamos un análisis de la industria de productos naturales el cual mostró que las condiciones del sector son favorables para la apertura de un negocio de este tipo, siempre y cuando se lo realice de una manera competitiva que mitigue las posibles dificultades que se pueden presentar. ...

  17. Contabilidad de costos ambientales en la industria cárnica, recomendaciones para su desarrollo

    OpenAIRE

    Yunier Maresma-Hernández

    2016-01-01

    La contabilidad ambiental ha logrado darle un matiz económico y financiero al uso, cuidado y conservación del medio ambiente, convirtiéndose esta, en una valiosa herramienta para la toma de decisiones, generando beneficios tanto para las organizaciones como para el medio natural. Es por tal razón que se enfoca este trabajo al estudio de los sistemas de costos empleados por la industria cárnica; tomando como estudio de caso la Empresa Cárnica Holguín. Para la realización de la investigación se...

  18. 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

  19. Generating para-water from para-hydrogen: A Gedankenexperiment.

    Science.gov (United States)

    Ivanov, Konstantin L; Bodenhausen, Geoffrey

    2018-07-01

    A novel conceptual approach is described that is based on the transfer of hyperpolarization from para-hydrogen in view of generating a population imbalance between the two spin isomers of H 2 O. The approach is analogous to SABRE (Signal Amplification By Reversible Exchange) and makes use of the transfer of spin order from para-hydrogen to H 2 O in a hypothetical organometallic complex. The spin order transfer is expected to be most efficient at avoided level crossings. The highest achievable enrichment levels of para- and ortho-water are discussed. Copyright © 2018 Elsevier Inc. All rights reserved.

  20. Para compreender a ciberliteratura

    Directory of Open Access Journals (Sweden)

    Lucia Santaella

    2012-12-01

    Full Text Available http://dx.doi.org/10.5007/1807-9288.2012v8n2p229   Mediante as mídias digitais, a configuração da literatura sofreu um salto qualitativo em todos os seus aspectos. O espaço virtual gerado pelas redes de computadores funciona como um novo meio. Abre-se com ele uma miríade de oportunidades que expandem o conceito de literatura em função da emergência de novas formas de criação literária. Disso decorre que a criação, a teoria e a crítica literárias exigem a redefinição de seus paradigmas herdados da era de Gutenberg. Tendo isso em vista, este artigo está voltado para a construção textual e hipertextual no espaço digital, o que implica uma exploração do que é ciberliteratura, em que ela se cruza e em que diverge da literatura impressa, que estratégias significantes a caracterizam e como essas estratégias são interpretadas pelos usuários na sua busca de significado.

  1. 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.

  2. Para-equilibrium phase diagrams

    International Nuclear Information System (INIS)

    Pelton, Arthur D.; Koukkari, Pertti; Pajarre, Risto; Eriksson, Gunnar

    2014-01-01

    Highlights: • A rapidly cooled system may attain a state of para-equilibrium. • In this state rapidly diffusing elements reach equilibrium but others are immobile. • Application of the Phase Rule to para-equilibrium phase diagrams is discussed. • A general algorithm to calculate para-equilibrium phase diagrams is described. - Abstract: If an initially homogeneous system at high temperature is rapidly cooled, a temporary para-equilibrium state may result in which rapidly diffusing elements have reached equilibrium but more slowly diffusing elements have remained essentially immobile. The best known example occurs when homogeneous austenite is quenched. A para-equilibrium phase assemblage may be calculated thermodynamically by Gibbs free energy minimization under the constraint that the ratios of the slowly diffusing elements are the same in all phases. Several examples of calculated para-equilibrium phase diagram sections are presented and the application of the Phase Rule is discussed. Although the rules governing the geometry of these diagrams may appear at first to be somewhat different from those for full equilibrium phase diagrams, it is shown that in fact they obey exactly the same rules with the following provision. Since the molar ratios of non-diffusing elements are the same in all phases at para-equilibrium, these ratios act, as far as the geometry of the diagram is concerned, like “potential” variables (such as T, pressure or chemical potentials) rather than like “normal” composition variables which need not be the same in all phases. A general algorithm to calculate para-equilibrium phase diagrams is presented. In the limit, if a para-equilibrium calculation is performed under the constraint that no elements diffuse, then the resultant phase diagram shows the single phase with the minimum Gibbs free energy at any point on the diagram; such calculations are of interest in physical vapor deposition when deposition is so rapid that phase

  3. 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.

  4. 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

  5. Algoritmos para problemas de empacotamento

    OpenAIRE

    Eduardo Candido Xavier

    2006-01-01

    Resumo: Neste trabalho estudamos diversos problemas de empacotamento considerados NP-difíceis. Assumindo a hipótese de que P ? NP, sabemos que não existem algoritmos eficientes (complexidade de tempo polinomial) exatos para resolver tais problemas. Uma das abordagens consideradas para tratar tais problemas é a de algoritmos de aproximação, que são algoritmos eficientes e que geram soluções com garantia de qualidade. Neste trabalho apresentamos alguns algoritmos aproximados para problemas de e...

  6. Sistema inteligente para elaborar um projeto de perfuração de um poço de petroleo

    OpenAIRE

    Ademar Takashi Sato

    1992-01-01

    Resumo: O trabalho apresenta a proposta de um Sistema Inteligente para Elaborar um Projeto de Perfuração de um Poço de Petróleo, que engloba o tratamento da base de dados, grafo de conhecimento para a escolha de poços de correlação, e recomendações para o posicionamento das sapatas com um grafo de conhecimento. Para tanto foram utilizadas diversas teorias e técnicas dentro da Inteligência Artificial. A aquisição do conhecimento de textos em linguagem natural, para a organização da base de dad...

  7. 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.

  8. Parto natural ¿Qué nos dice la evidencia?

    Directory of Open Access Journals (Sweden)

    Jorge Andrés Carvajal Cabrera

    2017-05-01

    Full Text Available Introducción: Es deseable que el proceso del parto concluya con una madre y un recién nacido sano, y sea un momento especial e íntimo. El Parto Natural, ha sido propuesto como una opción para mejorar la satisfacción de las mujeres con el proceso del parto. Sin embargo, no existen definiciones serias respecto a qué es el Parto Natural, introduciendo dificultades en la atención de mujeres que solicitan un Parto Natural. Métodos: El objetivo de este artículo es revisar la mejor evidencia disponible para entender cómo debe definirse un Parto Natural y analizar si se asocia a riesgos mayores que los de la atención médica habitual del parto. Resultados: Hemos comprobado que no existen definiciones científicas consensuadas para precisar qué es el Parto Natural, dejando espacio para discusión sobre su verdadero significado. No existen estudios de diseño aleatorizado y controlado que comparen el resultado materno/perinatal del parto natural comparado con la atención habitual del parto. Las intervenciones médicas, usadas en la atención médica del parto, y que podrían ser evitadas en el Parto Natural, producen algunos cambios favorables y otros deletéreos respecto de la salud materna y perinatal. Conclusiones: La decisión de optar por el Parto Natural debe ser discutida con las mujeres que lo solicitan, precisando con ella y su pareja cuál es su concepto de parto natural o qué es lo que desean incluir o evitar, los riesgos y beneficios asociados a cada una de las intervenciones deben ser expuestos por el equipo médico, para adoptar un plan de manejo individualizado.

  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...

  10. 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

  11. ¿Argumentar para definir o definir para argumentar?

    OpenAIRE

    Silva, Luz; Samper, Carmen

    2013-01-01

    Se presenta y se ilustra un marco de referencia de un estudio en curso para obtener el título de Maestría en Docencia de la Matemática de la Universidad Pedagógica Nacional (Colombia); estudio sobre la conexión entre las acciones de definir y argumentar, que puede contribuir a la práctica de profesores en ejercicio y en formación. La habilidad para construir una definición es un posible indicio de comprensión, mientras que saberla de memoria no garantiza la comprensión del concepto (Vinner, 1...

  12. 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...

  13. 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

  14. 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...

  15. Estudio de Factibilidad Técnico-Económico y Financiero para la Construcción de una Estación de Gas Natural y un Taller de Conversión Vehicular en la Provincia de Santa Elena

    OpenAIRE

    Espol; Marmol Hermosa, Daniel; Rivera Briones, José

    2015-01-01

    El proyecto consiste en construir una estación de servicio que expenda gas natural a los taxis de la provincia de Santa Elena adicionalmente propone construir un taller donde se ofrecerá el servicio de instalación y mantenimientos del kit, que permita usar el gas natural como combustible alternativo a la gasolina. El gas natural es el hidrocarburo que produce en los motores la combustión más limpia. Guayaquil Magíster en Gestión de Proyectos

  16. Exhibidor de cinturones para Montagne

    OpenAIRE

    Galletti, Julia

    2017-01-01

    En el exhibidor de cinturones diseñado para la marca de ropa deportiva Montagne se produjo un trabajo estético-formal en relación a la simbología característica de la marca. Su principal característica es ser un exhibidor 360°, es decir que desde cualquier punto de vista se puede obtener un buen panorama del producto expuesto. Está confeccionado en materiales livianos para facilitar su movilidad dentro del local estipulado (exhibición en vidriera o mostrador). Asimismo, es totalmente desarmab...

  17. Colombia competente para la paz

    Directory of Open Access Journals (Sweden)

    Norma Sofía Vanegas Torres

    2013-07-01

    Full Text Available La paz y la convivencia en Colombia demandan el desarrollo de un enfoque humanístico, una competencia particular que como las restantes competencias implican un saber y un saber hacer dentro de un contexto, pero que en este caso se relacionan más concretamente con el saber vivir. Este artículo analiza el desarrollo de una posible de competencia para la paz y analiza la importancia de la academia como medio para su desarrollo e instrumentalización. Se analizan al mismo tiempo las connotaciones de esta competencia en el marco de la sociedad posmoderna contemporánea.

  18. A Natural Language Architecture

    OpenAIRE

    Sodiya, Adesina Simon

    2007-01-01

    Natural languages are the latest generation of programming languages, which require processing real human natural expressions. Over the years, several groups or researchers have trying to develop widely accepted natural language languages based on artificial intelligence (AI). But no true natural language has been developed. The goal of this work is to design a natural language preprocessing architecture that identifies and accepts programming instructions or sentences in their natural forms ...

  19. Virginia Natural Heritage Program

    Science.gov (United States)

    Heritage About Natural Heritage Overview, Mission Natural Heritage Inventory Community Ecology Program ) | Strategic Plan (PDF) | Executive Progress Report (PDF) | Code of Ethics (PDF) Your browser does not support

  20. 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.

  1. Significant Variables in the Combustion Process of Natural Gas

    OpenAIRE

    Villaflor, Gloria; Morales, Graciela V; Velasco, Jorge

    2008-01-01

    Se determinan las variables significativas del proceso de combustión de gas natural, aquellas más sensibles para producir cambios importantes desde punto de vista económico y medioambiental. Con este fin se realiza la simulación del proceso de combustión de gas natural, utilizando el simulador comercial HYSYS. Se determina que las variables de operación más sensibles para este proceso son la temperatura del aire, la temperatura de los gases de combustión y el exceso de aire usado en la combus...

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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...

  8. Natural gas in India

    International Nuclear Information System (INIS)

    Lefevre, Thierry; Todoc, Jessie L.

    1999-11-01

    Contains Executive Summary and Chapters on: Country background; Overview of the energy sector; Natural gas supply; Natural gas infrastructure; Natural gas infrastructure; Natural gas demand; Outlook-government policy reform and industry development, and Appendices on Global and regional energy and gas trends; Overview of India's investment policy, incentives and regulation; The ENRON Dabhol power project. (Author)

  9. 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.

  10. 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...

  11. Revestimentos biodegradaveis para conservação do coco 'anão verde'

    OpenAIRE

    Josane Maria Resende

    2007-01-01

    Resumo: A água de coco verde é extremamente perecível após a colheita dos frutos e sua qualidade está diretamente relacionada às condições do ambiente de armazenagem. Portanto, são necessárias tecnologias que permitam a conservação do coco verde por um período superior a trinta dias para que o fruto possa ser exportado e comercializado mantendo a água em condições apropriadas para o consumo ao natural. O presente trabalho teve o objetivo de desenvolver revestimentos biodegradáveis para prolon...

  12. Natural gas monthly

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-01-01

    The Natural Gas Monthly highlights activities, events, and analyses of interest to public and private sector organizations associated with the natural gas industry. Volume and price data are presented each month for natural gas production, distribution, consumption, and interstate pipeline activities. Producer-related activities and underground storage data are also reported. From time to time, the Natural Gas Monthly features articles designed to assist readers in using and interpreting natural gas information.

  13. Determination of strontium isotopic composition in natural waters: examples of application in subsurface waters of the coastal zone of Bragantina region, Para, BR; Determinacao da composicao isotopica de estroncio em aguas naturais: exemplos de sua aplicacao em aguas subsuperficiais da zona costeira na regiao Bragantina-PA

    Energy Technology Data Exchange (ETDEWEB)

    Bordalo, Adriana Oliveira; Moura, Candido Augusto Veloso; Scheller, Thomas [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Centro de Geociencias]. E-mail: adriana@ufpa.br

    2007-07-15

    Analytical procedures used for determining the concentrations and isotope composition of strontium in subsurface waters, by mass spectrometry, are described. Sampling was performed in coastal plateaus, salt marsh and mangrove environments in the coastal region of Para. Coastal plateau waters have {delta}{sup 87}Sr between 1.51 and 6.26 per mille and Sr concentration bellow 58 ppb. Salt marsh waters show {delta}{sup 87}Sr between 0.55 and 0.90 per mille and Sr concentration between 93 and 114 ppm, while mangrove waters have {delta}{sup 87}Sr per mille around zero and Sr concentration above 15 ppm. Differences in the {sup 87}Sr/{sup 86}Sr ratio in these subsurface waters are detected, as well as seasonal variations in the coastal plateau waters. (author)

  14. 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

  15. 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

  16. 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.

  17. 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

  18. 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…

  19. Coccocypselum pulchellum (Rubiaceae, nuevo registro para Argentina

    Directory of Open Access Journals (Sweden)

    Elsa L. Cabral

    2007-01-01

    Full Text Available Se cita Coccocypselum pulchellum por primera vez para Argentina, en Predio Guaraní, Misiones. Esta es la tercera especie de Coccocypselum registrada para la flora de Argentina junto con C. hasslerianum y C. lanceolatum. Se incluyen descripciones, ilustraciones y una clave para reconocer las tres especies argentinas de Coccocypselum.

  20. 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.

  1. 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

  2. Biomaterials based on a natural polysaccharide: alginate

    Directory of Open Access Journals (Sweden)

    Marguerite Rinaudo

    2014-01-01

    Full Text Available En esta corta revisión, nuestro objetivo fue describir algunas nuevas aplicaciones de un polisacárido natural extraído de algas: el alginato. Primeramente, la composición química es revisada, además de citar las principales técnicas utilizadas para su caracterización. El papel de los bloques de ácido gulurónico (bloques GG es particularmente importante para las propiedades mecánicas del gel en presencia de Ca como contraión. Después, se mencionan brevemente las principales aplicaciones en el área de alimentos y biomedicina, seguida de aplicaciones experimentales en embalaje, papel, textiles, y vendajes de heridas, las cuales son descritas. Especialmente, fibras finas de alginato son ahora producidas industrialmente en una forma iónica mixta de sodio/calcio.

  3. 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.

  4. 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.

  5. 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.

  6. Condiciones para el aprendizaje organizacional

    Directory of Open Access Journals (Sweden)

    Delio Ignacio Castañeda

    2015-01-01

    Full Text Available El propósito de esta investigación es contribuir al entendimiento de algunas condiciones que favorecen el aprendizaje en las organizaciones, específicamente el rol de la cultura del aprendizaje, la formación, la claridad estratégica y el soporte organizacional. Se emplea una metodología cuantitativa con 613 participantes, empleados de una organización pública y 2 compañías privadas, las 3 entidades ubicadas en Bogotá, Colombia. Para la realización del estudio se conformó una muestra por conveniencia, con el apoyo de los jefes de recursos humanos de 3 organizaciones con sede en la ciudad de Bogotá, Colombia. Para la recolección de los datos se utilizó una escala Likert de 5 niveles de respuesta. Los resultados sugieren que las 4 condiciones estudiadas contribuyen al aprendizaje organizacional. Los hallazgos de este trabajo orientan a profesionales sobre dónde focalizar esfuerzos para promover la adquisición y la generación de conocimiento organizacional y aporta al trabajo investigativo ampliando la evidencia empírica sobre este campo de relevancia organizacional.

  7. Condiciones para el aprendizaje organizacional

    Directory of Open Access Journals (Sweden)

    Delio Ignacio Castañeda

    2015-01-01

    Full Text Available El propósito de esta investigación es contribuir al entendimiento de algunas condiciones que favorecen el aprendizaje en las organizaciones, específicamente el rol de la cultura del aprendizaje, la formación, la claridad estratégica y el soporte organizacional. Se emplea una metodología cuantitativa con 613 participantes, empleados de una organización pública y 2 compa˜nías privadas, las 3 entidades ubicadas en Bogotá, Colombia. Para la realización del estudio se conformó una muestra por conveniencia, con el apoyo de los jefes de recursos humanos de 3 organizaciones con sede en la ciudad de Bogotá, Colombia. Para la recolección de los datos se utilizó una escala Likert de 5 niveles de respuesta. Los resultados sugieren que las 4 condiciones estudiadas contribuyen al aprendizaje organizacional. Los hallazgos de este trabajo orientan a profesionales sobre dónde focalizar esfuerzos para promover la adquisición y la generación de conocimiento organizacional y aporta al trabajo investigativo ampliando la evidencia empírica sobre este campo de relevancia organizacional.

  8. 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)

  9. 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

  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. Árbol de decisiones para la resolución de incidencias

    OpenAIRE

    Molas Roca, Meritxell

    2016-01-01

    Análisis e implementación de un sistema de información para dar soporte al personal del grupo de soporte técnico en Everis para la resolución de incidencias del SI existente en Gas Natural (área de contratación). Se va a desarrollar basándose en la definición de un árbol de decisiones. Analysis and implementation of an information system to support the staff group at Everis for resolve the problems existing at Natural Gas computer sytem. The process of resolution of an issue is displayed b...

  12. Breast reconstruction - natural tissue

    Science.gov (United States)

    ... flap; TRAM; Latissimus muscle flap with a breast implant; DIEP flap; DIEAP flap; Gluteal free flap; Transverse upper gracilis flap; TUG; Mastectomy - breast reconstruction with natural tissue; Breast cancer - breast reconstruction with natural tissue

  13. 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 ...

  14. 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...

  15. 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...

  16. 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

  17. 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

  18. 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

  19. Efeito de duas cargas animais em campo nativo e de duas idades à desmama no desempenho de vacas de corte primíparas Effect of two stocking rates on natural pasture and two weaning ages on primiparous beef cows performance

    Directory of Open Access Journals (Sweden)

    José Inácio Braccini Fagundes

    2003-12-01

    Full Text Available A investigação foi realizada para avaliar os efeitos de duas cargas animais (CA280= 280 kg PV/ha e CA360= 360 kg PV/ha e de duas idades de desmama dos bezerros (DC = Desmama convencional aos sete meses de idade e DP= Desmama precoce aos três/quatro meses no comportamento reprodutivo de vacas de corte primíparas de duas composições raciais (½ Nelore ½ Hereford e ¼ Nelore ¾ Hereford. Foram avaliados os ganhos de peso médios diários (GMD do pós-parto à data da desmama convencional, durante o acasalamento, da desmama precoce à desmama convencional (GPC, a condição corporal (CC ao início do acasalamento, ao final do acasalamento e na data da desmama convencional, a taxa de prenhez (TP e o intervalo de partos (IEP. As vacas conduzidas na CA280 tiveram significativamente maiores GMD do que vacas na CA360 nos três períodos estudados. Vacas submetidas ao tratamento de desmama precoce tiveram GPC maiores que vacas submetidas à desmama convencional (0,539 vs. 0,257 kg/dia, respectivamente. Vacas da CA280 tiveram significativamente maiores condições corporais do início do acasalamento à data da desmama convencional do que vacas da CA360, sendo que vacas submetidas à desmama precoce apresentaram condição corporal na data da desmama convencional superior àquela das vacas da desmama convencional sob ambas cargas animais (4,33 vs. 3,68 para CA280 e 3,14 vs. 2,92 para CA360. A composição racial das vacas não influenciou significativamente o GMD e a condição corporal das vacas no período experimental. A TP da CA280 (67,56% foi significativamente superior à da CA360 (22,56%, bem como o seu IEP foi significativamente inferior ao da CA360 (395,4 vs. 409,9 dias. Portanto, a carga animal menor permitiu que as vacas apresentassem maiores recuperações de peso e condição corporal no pós-parto, determinando melhores taxas de reconcepção e menores intervalos de partos.The investigation was carried out to evaluate the effects of

  20. 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

  1. 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

  2. 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

  3. 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

  4. NATURAL GAS TRANSPORTATION

    OpenAIRE

    Stanis³aw Brzeziñski

    2007-01-01

    In the paper, Author presents chosen aspects of natural gas transportation within global market. Natural gas transportation is a technicaly complicated and economicly expensive process; in infrastructure construction and activities costs. The paper also considers last and proposed initiatives in natural gas transportation.

  5. 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.

  6. 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.

  7. 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.

  8. 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

  9. 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....

  10. Learning from nature: Nature-inspired algorithms

    DEFF Research Database (Denmark)

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

    2016-01-01

    .), genetic and evolutionary strategies, artificial immune systems etc. Well-known examples of applications include: aircraft wing design, wind turbine design, bionic car, bullet train, optimal decisions related to traffic, appropriate strategies to survive under a well-adapted immune system etc. Based......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...... on collective social behaviour of organisms, researchers have developed optimization strategies taking into account not only the individuals, but also groups and environment. However, learning from nature, new classes of approaches can be identified, tested and compared against already available algorithms...

  11. Novel natural food antimicrobials.

    Science.gov (United States)

    Juneja, Vijay K; Dwivedi, Hari P; Yan, Xianghe

    2012-01-01

    Naturally occurring antimicrobial compounds could be applied as food preservatives to protect food quality and extend the shelf life of foods and beverages. These compounds are naturally produced and isolated from various sources, including plants, animals and microorganisms, in which they constitute part of host defense systems. Many naturally occurring compounds, such as nisin, plant essential oils, and natamycin, have been widely studied and are reported to be effective in their potential role as antimicrobial agents against spoilage and pathogenic microorganisms. Although some of these natural antimicrobials are commercially available and applied in food processing, their efficacy, consumer acceptance and regulation are not well defined. This manuscript reviews natural antimicrobial compounds with reference to their applications in food when applied individually or in combination with other hurdles. It also reviews the mechanism of action of selected natural antimicrobials, factors affecting their antimicrobial activities, and future prospects for use of natural antimicrobials in the food industry.

  12. 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.

  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. A Natural Love of Natural Products

    OpenAIRE

    Kingston, David G. I.

    2008-01-01

    Recent research on the chemistry of natural products from the author?s group that led to the receipt of the ACS Ernest Guenther Award in the Chemistry of Natural Products is reviewed. REDOR NMR and synthetic studies established the T-taxol conformation as the bioactive tubulin-binding conformation, and these results were confirmed by the synthesis of compounds which clearly owed their activity or lack of activity to whether or not they could adopt the T-taxol conformation. Similar studies wit...

  15. SEMINÁRIO INTERNACIONAL TURISMO E ARQUEOLOGIA: PATRIMÔNIO CULTURAL E NATURAL –PELOTAS/RS/BRASIL PROMOÇÃO DA REDE INTERINSTITUCIONAL UFPEL-UFSM-IPT PARA O DESENVOLVIMENTO INTEGRADO DA ARQUEOLOGIA, PALEONTOLOGIA,TURISMO CULTURAL, PRESERVAÇÃO E EDUCAÇÃO PA

    Directory of Open Access Journals (Sweden)

    Fábio Vergara Cerqueira

    2012-09-01

    Full Text Available O Seminário Internacional Turismo e Arqueologia: Patrimônio Cultural e Natural  foi idealizado e promovido pela rede interinstitucional estabelecida entre a Universidade Federal de Pelotas (UFPEL, a Universidade Federal de Santa Maria (UFSM e o Instituto Politécnico de Tomar (IPT-Portugal, visando ao desenvolvimento de projetos nas áreas de Arqueologia, Paleontologia, Preservação e Educação Patrimonial e Turismo Cultural. Sua realização ocorreu em Pelotas/RS/Brasil, entre 24 e 27 de Novembro de 2004.

  16. 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.

  17. Recursos forestales para la vivienda

    Directory of Open Access Journals (Sweden)

    Olga Elgueta A.

    1984-06-01

    Full Text Available En una visita a la Universidad del Bío-Bío, realizada por el arquitecto peruano Cristián Arbaiza, dio a conocer detalladamente cuáles fueron los propósitos que tuvo el Pacto Andino -del cual es funcionario- para ocuparse de la forestación tropical y su relación con la vivienda, aspectos considerados fundamentales en el estudio de soluciones que permitan paliar el grave déficit habitacional que afecta a los países que componen el grupo subregional andino.

  18. Condiciones para el aprendizaje organizacional

    OpenAIRE

    Delio Ignacio Castañeda

    2015-01-01

    El propósito de esta investigación es contribuir al entendimiento de algunas condiciones que favorecen el aprendizaje en las organizaciones, específicamente el rol de la cultura del aprendizaje, la formación, la claridad estratégica y el soporte organizacional. Se emplea una metodología cuantitativa con 613 participantes, empleados de una organización pública y 2 compa˜nías privadas, las 3 entidades ubicadas en Bogotá, Colombia. Para la realización del estudio se conformó una muestra por conv...

  19. Entre velos: Maya para contrabajo

    OpenAIRE

    Rosa María Rodríguez Hernández

    2014-01-01

    Maya para contrabajo se materializa a partir de una imagen de Pepe Romero, cuyo texto interpreta a La decadencia de la mentira de Oscar Wilde. La estructura de Maya es binaria, especular y asimétrica; su poética obedece al juego verdad/mentira que subyace en la obra artística y en la vivencia del artista. Maya trae a la memoria las voces de los Upanishad, Schopenhauer, Shakespeare y Beethoven, influencias éstas en la obra de Wagner y, todas ellas, en la de Eliot. Los aspectos gestuales y visu...

  20. ECONOMY AND PARA-FISCAL LEVIES IN BOSNIA AND HERZEGOVINA

    Directory of Open Access Journals (Sweden)

    Hasan Mahmutović

    2017-04-01

    Full Text Available The system of para-fiscal levies implies different types of benefits or compensation and payment of citizens and companies for the use of goods or services of state administration which are para-fiscal sources of income of the state. The main characteristics of para-fiscal levies are: they do not originate from all tax payers, but only from members of certain social groups that are linked to some common economic or social interests; they are not part of the budget funds and not regulate them fiscal authorities; they have the character of destined public revenues, as they regularly represent a dedicated revenue whit which a specific task of economic or social character would be solved; they represent a secondary tax levy, which means that they exist along with the country’s tax levy, to draw funds from the same economic resources and to have almost the same economic effects, as well as the collection of taxes; they shall be paid on the basis of laws and decisions or decision of the competent authorities (general obligation or by contract (a specific levy, ie. an individual obligation; they shall be paid in the event of use of property of general interest and / or services of state administration; they represent giving of money, which is always direct, ie. giving cash on the basis of the decision and with the issuance of a receipt of payment (receipt from a box office or bank. Para-fiscal levies should be understood as fees that economic operators and citizens pay for the use of certain goods or services. These are not taxes and they do not serve to fill the budget. However, in Bosnia and Herzegovina the biggest part of para-fiscal levies is used as a parallel budget revenue, as revenue for the operation of the costly administrative apparatus. A large number of studies on para-fiscal levies in Bosnia and Herzegovina showed that they have a negative impact on economic growth and development. Basically para-fiscal levies, for business entities at

  1. 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)

  2. Una propuesta para lograr la acreditación en enfermería

    Directory of Open Access Journals (Sweden)

    Luz Marina Bautista-Rodriguez

    2006-12-01

    Full Text Available La evaluación es una actividad que todas las personas realizan constantemente para juzgar si algo está adecuado o inadecuado, satisfactorio o insatisfactorio, bueno o malo. Esta puede convertirse en un componente natural de la formación e interacción del grupo, un ejercicio indispensable que permite a una organización conocerse continuamente y actuar de una manera informada. Para enfermería este aspecto del proceso administrativo es aplicable y vital para mejorar y mostrar el alcance que tienen o pueden alcanzar los servicios de enfermería. El presente articulo retorna elementos teóricos y prácticos existentes en el medio sobre la evaluación y plantea finalmente los aspectos claves en los cuales enfermería debe enfatizar para lograr la acreditación.

  3. Pequenos para idade gestacional: fator de risco para mortalidade neonatal

    Directory of Open Access Journals (Sweden)

    Almeida Márcia Furquim de

    1998-01-01

    Full Text Available OBJETIVO: Estudar as variáveis contempladas na Declaração de Nascimento (DN como possíveis fatores de risco para nascimentos pequenos para a idade gestacional (PIG e o retardo de crescimento intra-uterino como fator de risco para a mortalidade neonatal. MATERIAL E MÉTODO: As variáveis existentes na DN foram obtidas diretamente de prontuários hospitalares. Os dados referem-se a uma coorte de nascimentos obtida por meio da vinculação das declarações de nascimento e óbito, correspondendo a 2.251 nascimentos vivos hospitalares, de mães residentes, ocorridos no Município de Santo André, Região Metropolitana de São Paulo, no período de l/1 a 30/6/1992, e aos óbitos neonatais verificados nessa coorte. RESULTADOS: Obteve-se a proporção de 4,3% de nascimentos PIG, significativamente maior entre os recém-nascidos de pré-termo e pós-termo, entre os nascimentos cujas mães tinham mais de 35 anos de idade e grau de instrução inferior ao primeiro grau completo. Os recém-nascidos PIG apresentam maior risco de morte neonatal que aqueles que não apresentavam sinais de retardo de crescimento intra-uterino. CONCLUSÕES: Em áreas com menor freqüência de baixo peso ao nascer, é importante investigar a presença de retardo de crescimento intra-uterino entre os nascimentos prematuros e não apenas nos nascimentos de termo. O registro da data da última menstruação (ou da idade gestacional em semanas não agregadas na DN facilitaria a detecção de PIGs na população de recém-nascidos.

  4. Para onde vai a Geografia?

    Directory of Open Access Journals (Sweden)

    Angélica Karina Dillenburg Horii

    2015-12-01

    Full Text Available O presente artigo aborda a evolução da Geografia enquanto pensamento científico, analisando seu objeto de estudo e suas categorias de análise durante todo o percurso da criação desse saber. Observa primeiramente a formação da Geografia Clássica, que teve seus princípios já instituídos na Antiguidade com Ptolomeu e Estrabão, desdobrando-se no período Iluminista com Ritter e Humboldt que fornecerão uma nova temporalidade a essa ciência. Atinge seu ápice na Modernidade Industrial com a racionalidade de Kant, onde Ratzel e La Blache utilizarão o determinismo e o possibilismo para constituir um discurso científico para a Geografia. Finaliza apontando a nova compreensão do mundo, conhecida como pós-modernismo por David Harvey (1992 ou por Milton Santos (1996 como Globalização, que junto a outros geógrafos e pesquisadores, indicam caminhos de análise dessa ciência na compreensão do seu objeto de estudo. Um diálogo entre os autores na construção do pensamento geográfico.

  5. Nanoinsecticidas: Nuevas perspectivas para el control de plagas

    OpenAIRE

    Teodoro STADLER; Micaela BUTELER; David K. WEAVER

    2010-01-01

    La agricultura de bajo impacto ambiental demanda nuevos pesticidas que deben ajustarse a las exigentes normativas internacionales. Parte de la búsqueda de nuevos productos bio-racionales se desarrolla por fuera del marco de la síntesis orgánica, explorando diferentes sustancias de origen natural como extractos vegetales, aceites insecticidas e insecticidas inorgánicos. Los polvos insecticidas representan el grupo más antiguo de sustancias utilizadas por el hombre para el control de plagas, cu...

  6. 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

  7. 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.

  8. 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

  9. Infraestructura para laboratorios de acceso remoto

    Directory of Open Access Journals (Sweden)

    López Luro, Francisco

    2009-01-01

    Full Text Available Las tecnologías de Internet permiten el uso de sistemas de software distribuido para el acceso en forma remota a laboratorios físicos y virtuales, para llevar a cabo actividades de investigación experimental a distancia. A partir de los marcos teóricos que definen los estructurantes de los laboratorios, los implementadores de laboratorios de acceso remoto deben diseñar y desarrollar arquitecturas de servicios que permitan un acceso flexible y controlado. Este trabajo define una infraestructura para la implementación de aplicaciones para el acceso remoto a laboratorios físicos y virtuales y para la gestión de los mismos. Se presentan conceptos que permiten extender la modalidad tradicional de conexión con un dispositivo, para llevar adelante actividades prácticas de laboratorio colaborativas y concurrentes.

  10. Internet como instrumento para la Yihad

    Directory of Open Access Journals (Sweden)

    Alfonso Merlos García

    2006-01-01

    Full Text Available Las extraordinarias ventajas que ofrece Internet lo han convertido en un instrumento clave y dinámico en la estrategia de los yihadistas. Los medios de comunicación, la clase política y las agencias de seguridad e información han tendido a concentrar sus esfuerzos en la neutralización del ciberterrorismo sin prestar suficiente atención a los múltiples usos de Internet que están haciendo los neosalafistas: para la propaganda y para la guerra psicológica, para el reclutamiento y para la financiación, para la documentación y para la planificación de atentados. Las democracias deberían considerar el coste que tendrá la derrota frente al movimiento yihadista globalizado en la batalla por el ciberespacio

  11. Natural Information Processing Systems

    OpenAIRE

    John Sweller; Susan Sweller

    2006-01-01

    Natural information processing systems such as biological evolution and human cognition organize information used to govern the activities of natural entities. When dealing with biologically secondary information, these systems can be specified by five common principles that we propose underlie natural information processing systems. The principles equate: (1) human long-term memory with a genome; (2) learning from other humans with biological reproduction; (3) problem solving through random ...

  12. Perturbative calculations of flow patterns in free convection between coaxial cylinders. Non-linear temperature dependences of the fluid properties; Un metodo de perturbaciones para la obtencion de perfiles de velocidad en conveccion natural entre cilindros coaxiales, dependencias de la temperatura no-lineales de las propiedades del fluido

    Energy Technology Data Exchange (ETDEWEB)

    Navarro, J A; Madariaga, J A; Santamaria, C M; Saviron, J M

    1980-07-01

    10 refs. Flow pattern calculations in natural convection between two vertical coaxial cylinders are reported. It is assumed trough the paper. that fluid properties, viscosity, thermal conductivity and density, depend no-linearly on temperature and that the aspects (height/radius) ratio of the cylinders is high. Velocity profiles are calculated trough a perturbative scheme and analytic results for the three first perturbation orders are presented. We outline also an iterative method to estimate the perturbations on the flow patterns which arise when a radial composition gradient is established by external forces in a two-component fluid. This procedure, based on semiempirical basis, is applied to gaseous convection. The influence of the molecules gas properties on tho flow is also discussed. (Author) 10 refs.

  13. 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.

  14. Inteligencia Emocional para tiempos de crisis

    OpenAIRE

    Fernández-Berrocal, Pablo

    2014-01-01

    La Inteligencia Emocional se concibe como un conjunto de habilidades, tanto básicas como complejas, dirigidas a “unificar las emociones y el razonamiento”, esto es, usar las emociones para facilitar el razonamiento y los procesos de pensamiento, y usar nuestro razonamiento para pensar de forma inteligente acerca de nuestras emociones (Mayer y Salovey, 1997). En concreto, la IE se define como una habilidad mental que incluye “la capacidad para percibir, valorar y expresar las emociones con...

  15. 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

  16. 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.......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....

  17. 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....

  18. Natural gas annual 1997

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    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.

  19. 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

  20. Nephrotoxicity of Natural Products.

    Science.gov (United States)

    Nauffal, Mary; Gabardi, Steven

    2016-01-01

    The manufacture and sale of natural products constitute a multi-billion dollar industry. Nearly a third of the American population admit to using some form of complementary or alternative medicine, with many using them in addition to prescription medications. Most patients fail to inform their healthcare providers of their natural product use and physicians rarely inquire. Annually, thousands of natural product-induced adverse events are reported to Poison Control Centers nationwide. Natural product manufacturers are not responsible for proving safety and efficacy, as the FDA does not regulate them. However, concerns exist surrounding the safety of natural products. This review provides details on natural products that have been associated with renal dysfunction. We have focused on products that have been associated with direct renal injury, immune-mediated nephrotoxicity, nephrolithiasis, rhabdomyolysis with acute renal injury, hepatorenal syndrome, and common adulterants or contaminants that are associated with renal dysfunction. The potential for natural products to cause renal dysfunction is justifiable. It is imperative that natural product use be monitored closely in all patients. Healthcare practitioners must play an active role in identifying patients using natural products and provide appropriate patient education. © 2016 S. Karger AG, Basel.

  1. Nature as Dissonant Heritage

    DEFF Research Database (Denmark)

    Clemmensen, Thomas Juel

    2014-01-01

    accepts that nature it not existing outside culture as something that be restored to its original state, but a contemporary product created and managed with certain objectives in mind, nature restoration like heritage production are prone to same kind of dissonance – our nature is not necessary...... their nature. According to Ashworth cultural dissonance can be managed in a number of different way depending on which type of plural society is preferred. Many of these management strategies consciously or unconsciously involve some form of denial, neglect, destruction, reinterpretation or marginalizing...

  2. Oklo natural reactor

    International Nuclear Information System (INIS)

    Fujii, Isao

    1985-01-01

    In 1954, Professor Kazuo, Kuroda of Arkansas University in USA published the possibility that spontaneously generated natural nuclear reactors existed in prehistoric age. In 1972, 18 years after that, Commissariat a l'Energie Atomique published that in the Oklo uranium deposit in Gabon, Africa, a natural nuclear reactor was found. This fact was immediately informed to the whole world, but in Japan, its details have not necessarily been well known. The chance of investigating into this fact and visiting the Oklo deposit by the favor of COMUF, the owner of the Oklo deposit, was given, therefore, the state of the natural reactors, which has been known so far, is reported. At present, 12 natural reactors have been found in the vicinity of the Oklo deposit. The natural reactors were generated spontaneously in uranium deposits about 1.7 billion years ago when the isotopic abundance of U-235 was 3 %, and the chain reaction started naturally. When the concentration of U-235 lowered, the reaction stopped naturally. The abnormality in the U-235 abundance in natural uranium was found, and the cause was pursued. The evidence of the existence of natural reactors was shown. (Kako, I.)

  3. A mathematical nature walk

    CERN Document Server

    Adam, John A

    2009-01-01

    How heavy is that cloud? Why can you see farther in rain than in fog? Why are the droplets on that spider web spaced apart so evenly? If you have ever asked questions like these while outdoors, and wondered how you might figure out the answers, this is a book for you. An entertaining and informative collection of fascinating puzzles from the natural world around us, A Mathematical Nature Walk will delight anyone who loves nature or math or both. John Adam presents ninety-six questions about many common natural phenomena--and a few uncommon ones--and then shows how to answer them using mostly b

  4. Erodibilidade de um cambilosolo húmico sob chuva natural

    OpenAIRE

    Schick, Jefferson; Bertol, Ildegardis; Cogo, Neroli Pedro; Paz González, Antônio

    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...

  5. 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...

  6. THE SOCIAL PERCEPTION OF NATURAL HAZARDS RISK: PORTUGAL AND TUVALU

    OpenAIRE

    Rodrigo Rudge Ramos Ribeiro; Celeste Oliveira Alves Coelho

    2012-01-01

    Los efectos del cambio climático y del nivel del mar deben causar graves problemas para los habitantes de algunas pequeñas islas como Tuvalu en el futuro. Como resultado de una combinación de procesos naturales y acción antropogénica, el cambio del nivel del mar genera un impacto diferente. Esta investigación aborda la percepción del riesgo natural y del cambio climático en Portugal y Tuvalu. La percepción de algunos riesgos naturales, como la subida del nivel del mar, puede ser distinta para...

  7. Natural circulation in pressurized water reactors

    International Nuclear Information System (INIS)

    Bastos, J.L.F.; Loureiro, L.V.; Rocha, R.T.V. da; Umbehaun, P.E.

    1992-01-01

    Several analytical modelling have been done for steady-state and slow transients conditions, besides more sophisticated studies considering two and three dimensional effects in a very simple geometry. Under severe accident conditions for PWR a code to analyse natural circulation has been developed by Westinghouse. This paper discusses the problem of natural circulation in a complex geometry similar to that of nuclear power plants. A first experiment has been done at the integral test facility of 'Co-ordination of Special Projects-Ministry of Naval Affairs' (Coordenadoria para Projetos Especiais -Ministerio da Marinha, COPESP) for several flux conditions. The results obtained were compared with numerical simulations for the steady-state regime. 09 refs, 05 figs, 01 tab. (B.C.A.)

  8. Sistema de realidad aumentada para aplicaciones Android

    OpenAIRE

    Fernández Sánchez, Natalia Mercedes

    2012-01-01

    El objetivo principal de este proyecto es la creación de un sistema de realidad aumentada para el sistema operativo Android con idea de que sea utilizado para la creación de un videojuego, pero que a su vez sea lo suficientemente versátil como para poder utilizarse en otro tipo de aplicaciones. De este objetivo principal podemos obtener los objetivos secundarios: - Conocer las características que ofrecen los teléfonos móviles y como éstas pueden ser aprovechadas para la crea...

  9. Paisajes para un desarrollo sustentable y participativo

    Directory of Open Access Journals (Sweden)

    Rafael Mata Olmo

    2014-11-01

    Para terminar, el texto recoge una experiencia de proyecto territorial de paisaje, la del Plan Insular de Menorca (Islas Baleares, España, aprobado en 2003. Se sintetizan sus determinaciones sobre la protección de determinados terrenos por sus altos valores paisajísticos, sus directrices para que las políticas sectoriales (turismo, agricultura, infraestructuras, etc. incorporen criterios paisajísticos, y sus iniciativas para la gestión y mejora del paisaje y para el fomento del acceso público a su contemplación y disfrute.

  10. Guias ópticos para sensores

    OpenAIRE

    Marcos de Castro Pacitti

    1993-01-01

    Neste trabalho foram estudados guias ópticos para atuarem como sensores ou em sistemas sensores. Ênfase especial foi dada em guias ópticos retangulares, para dispositivos ópticos integrados, e fibras ópticas elípticas. A analise de fibras ópticas elípticas resultou em um modelamento pratico para projeto das mesmas em aplicações onde se deseja operar com dois modos guiados, situação esta que se mostra muito atraente para implementação de diversos tipos de sensores a fibra óptica. A seguir es...

  11. Adesao ao guia alimentar para populacao brasileira

    Directory of Open Access Journals (Sweden)

    Eliseu Verly Junior

    2013-12-01

    Full Text Available OBJETIVO : Analisar a adesão ao Guia Alimentar para População Brasileira. MÉTODOS : Amostra composta por participantes do Inquérito de Saúde de São Paulo (n = 1.661 que preencheram dois recordatórios de 24 horas. Foi utilizado modelo bivariado de efeito misto para a razão entre o consumo de energia do grupo de alimentos e o consumo calórico total. A razão estimada foi utilizada para calcular o percentual de indivíduos com consumo abaixo ou acima da recomendação. RESULTADOS : Pelo menos 80,0% da população consome abaixo do recomendado para: leite e derivados; frutas e sucos de frutas; e cereais, tubérculos e raízes; aproximadamente 60,0% para legumes e verduras; 30,0% para feijões; e 8,0% para carnes e ovos. Adolescentes apresentaram a maior inadequação para legumes e verduras (90,0%, e o estrato de maior renda foi associado à menor inadequação para óleos, gorduras e sementes oleaginosas (57,0%. CONCLUSÕES : Foi observado consumo inadequado dos grupos de alimentos relacionados com aumento do risco de doenças crônicas.

  12. Leasing: una alternativa de financiamiento para PYMES

    OpenAIRE

    Bedjan, María Belén

    2008-01-01

    En la actualidad las pequeñas y medianas empresas encuentran dificultades para acceder a las líneas tradicionales de créditos bancarios. Por otro lado las empresas necesitan actualizarse constantemente para poder ser competitivas en el mercado. Es aquí donde el leasing nace como una alternativa de financiación para las PyMEs. Este trabajo pretendió demostrar la conveniencia financiera del leasing con respecto a los préstamos bancarios para la compra de maquinarias agrícolas ...

  13. Tipologia para a contabilidade ambiental

    Directory of Open Access Journals (Sweden)

    Nazlhe Faride Chein Schekaiban

    2007-06-01

    Full Text Available Este artigo revê a visão, as propostas e o desenvolvimento da contabilidade ambiental, refletindo sobre suas implicações, com a finalidade de descobrir e encontrar sua importância e situação. Para se chegar a esse resultado foi preciso realizar uma revisão epistemológica moldada e processo reflexivo de sustentabilidade e da aproximação ao usuário, da percepção da realidade contábil no México e da gerência interna das organizações. As conclusões mostram a contabilidade ambiental no México fora da re-alidade operativa do modelo contábil regional, aumentando a importância de se criar uma cultura capaz de examinar o controle da missão deste tipo de contabilidade.

  14. TV broadcasting para el desarrollo

    Directory of Open Access Journals (Sweden)

    Valerio Fuenzalida

    2015-01-01

    Full Text Available Entre los intentos de producción de televisión masiva con objetivos educativos, conscientizadores, desarrollistas o superadores hay más fracasos que éxitos. El autor propone que esto se debe a la incomprensión, por parte de los productores, de las actitudes y motivaciones de los receptores. Su análisis sobrio llama la atención sobre las características propias del medio y de sus distintos géneros y audiencias. Del análisis se desprende la necesidad de moderar las expectativas y el rechazo de las tesis que niegan al medio todo significado y potencial para el desarrollo. Fuenzalida transforma la tradicional crítica al medio y sus empresas en una llamada de atención a quienes producen es ese contexto.

  15. MERCADEO SOCIAL PARA LA SALUD

    Directory of Open Access Journals (Sweden)

    Renata Seidel

    2015-01-01

    Full Text Available Se ofrece un amplio análisis sobre la industria electoral, recordando que un candidato a presidente es "un producto para la venta". Se Desmenuzan las estrategias utilizadas en el plebiscito chileno,las elecciones norteamericanas con el NO a BUSH. El Mercadeo Social es una nueva metodología utilizada en proyectos de desarrollo a nivel de campo por ello se hace un esclarecimiento y clarifica el vínculo con la comunicación. Se agrega temas como: Los modelos de recepción de mensajes cuyos marcos conceptuales y metodologías aún no se han adaptado al potencial de esta línea de trabajo.Se analiza la agonía de las radios mineras en Bolivia en la que 42 años de historia y heroísmo se desmoronan.

  16. Entre velos: Maya para contrabajo

    Directory of Open Access Journals (Sweden)

    Rosa María Rodríguez Hernández

    2014-01-01

    Full Text Available Maya para contrabajo se materializa a partir de una imagen de Pepe Romero, cuyo texto interpreta a La decadencia de la mentira de Oscar Wilde. La estructura de Maya es binaria, especular y asimétrica; su poética obedece al juego verdad/mentira que subyace en la obra artística y en la vivencia del artista. Maya trae a la memoria las voces de los Upanishad, Schopenhauer, Shakespeare y Beethoven, influencias éstas en la obra de Wagner y, todas ellas, en la de Eliot. Los aspectos gestuales y visuales de Maya entrelazan con la danza de Pina Bausch y con la retórica (hypotiposis.

  17. Profesiones emergentes para los comunicadores

    Directory of Open Access Journals (Sweden)

    Manuel Ortiz Marín

    2015-01-01

    Full Text Available Señala el autor que en México se ha iniciado una lenta pero segura transformación del campo profesional de la comunicación. La carrera de Comunicación ocupa el octavo lugar entre las carreras más demandadas en la Educación Superior de México, que con la fuerte avalancha tecnológica y el surgimiento de la apertura de nuevos espacios sociales y político-económicos han impulsado otras formas de hacer comunicación. Dos son los campos más opcionados: medios de comunicación masiva, y lo organizacional y la publicidad, aunadas al surgimiento del marketing político. Hoy se demanda del profesional nuevas y dinámicas competencias para enfrentar escenarios laborales antes no explorados.

  18. Una minga para el posdesarrollo

    Directory of Open Access Journals (Sweden)

    Arturo Escobar

    2011-01-01

    Full Text Available El artículo sintetiza algunas conclusiones a las que han llegado movimientos sociales y académicos en las últimas dos décadas al reflexionar sobre la globalización y sus implicaciones; el modelo dominante, basado en las nociones de "desarrollo" y "modernidad", ha entrado en crisis. Por lo tanto, se hace necesario avanzar en una transición cultural que se pueda comprender como un cambio de época y no sólo como una época de cambios. Para llevar a cabo esta transformación, se deben resolver las con-tradicciones existentes entre el neodesarrollismo y el postdesarrollo, por supuesto, a favor de éste último.

  19. para su puesta en marcha

    Directory of Open Access Journals (Sweden)

    Sergio Franco Maass

    2004-01-01

    Full Text Available Los sistemas de información geográfica (SIG tienen una gran aplicación en la gestión municipal; permiten cumplir con dos objetivos fundamentales: el registro de información territorial y el análisis de problemas territoriales específicos. Con el fin de determinar la viabilidad de este tipo de tecnologías en el ámbito municipal, se enfrentó el problema de la localización de instalaciones para la disposición final de residuos sólidos urbanos en el municipio de Toluca, Estado de México. Se identifican ciertos aspectos que limitan la práctica de los SIG: la diversidad entre los municipios, los problemas administrativos, las deficiencias de la información y la carencia de recursos humanos, técnicos y financieros.

  20. 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...

  1. 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…

  2. Greenland and Natural Resources

    DEFF Research Database (Denmark)

    Lyck, Lise

    Greenland policy can delay and maybe change the future of the forecasted development of the use of natural resources. This book is relevant for anyone interested in Greenland in general and the development of Greenland both politically and economically and in relation natural resources....

  3. Natural - synthetic - artificial!

    DEFF Research Database (Denmark)

    Nielsen, Peter E

    2010-01-01

    The terms "natural," "synthetic" and "artificial" are discussed in relation to synthetic and artificial chromosomes and genomes, synthetic and artificial cells and artificial life.......The terms "natural," "synthetic" and "artificial" are discussed in relation to synthetic and artificial chromosomes and genomes, synthetic and artificial cells and artificial life....

  4. 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)

  5. 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…

  6. Plutonium in nature

    International Nuclear Information System (INIS)

    Madic, C.

    1994-01-01

    Plutonium in nature comes from natural sources and anthropogenic ones. Plutonium at the earth surface comes principally from anthropogenic sources. It is easily detectable in environment. The plutonium behaviour in environment is complex. It seems necessary for the future to reduce releases in environment, to improve predictive models of plutonium behaviour in geosphere, to precise biological impact of anthropogenic plutonium releases

  7. 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.)

  8. 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

  9. COPROPHANAEUS MORENOI ARNAUD, 1982 (COLEOPTERA: SCARABAEIDAE: SCARABAEINAE) IN THE GORGONA NATIONAL NATURAL PARK (COLOMBIAN PACIFIC OCEAN)

    OpenAIRE

    Cultid Medina, Carlos A; Giraldo López, Alan

    2012-01-01

    A new record of the dung beetle Coprophanaeus morenoi Arnaud, 1982 (Coleoptera: Scarabaeidae: Scarabaeinae), for the Gorgona Natural National Park (Gorgona NNP, Colombia) in the Colombian Pacific Ocean is presented. Se presenta un nuevo registro del escarabajo estercolero Coprophanaeus morenoi Arnaud, 1982 (Coleoptera: Scarabaeidae: Scarabaeinae), para el Parque Natural Nacional Gorgona, en el océano Pacifico colombiano.

  10. Growing natural gas usage

    International Nuclear Information System (INIS)

    Saarni, T.

    1996-01-01

    Finnish natural gas usage topped the 3.3 billion cubic metre mark last year, up 3.6 % on the 1994 figure. Growth has increased now for 12 years in a row. Thanks to offtake by large individual users, the pipeline network has been expanded from South-East Finland to the Greater Helsinki area and central southern Finland. Natural gas plays a much larger role in this region than the 10 % accounted for by natural gas nationally would indicate. The growth in the share of Finland's energy use accounted for by natural gas has served to broaden the country's energy supply base. Natural gas has replaced coal and oil, which has considerably reduced the level of emissions resulting form energy generation

  11. 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.

  12. Análise da Fragilidade e Vulnerabilidade Natural dos Terrenos aos Processos Erosivos como Base para o Ordenamento Territorial: o Caso das Bacias do Córrego Carioca, Córrego do Bação e Ribeirão Carioca na Região do Alto Rio das Velhas-MG

    Directory of Open Access Journals (Sweden)

    Clibson Alves dos Santos

    2008-10-01

    Full Text Available As bacias do Córrego Carioca, do Córrego do Bação e do Ribeirão do Carioca fazem parte da bacia do rio Itabirito, tributário no alto rio das Velhas, afluente do Rio São Francisco. Essa região é marcada por intensos processos erosivos, decorrentes do uso inadequado dos solos. Sendo evidenciados diversos conflitos de uso dos terrenos e recursos hídricos, devido ao desenvolvimento da atividade minerária, das atividades industriais, das práticas agropastoris, da crescente ocupação urbana e da expansão imobiliária por condomínios residenciais de classe alta. Nesse trabalho, analisou-se a susceptibilidade natural dos terrenos aos processos erosivos, tendo como base as unidades geomorfológicas definidas por Santoset al. (2006 e os métodos propostos por Crepani et al. (1996; 2001 e Ross (1992; 1994; 2000, visando contribuir no processo de planejamento ambiental e ordenamento territorial dessa região. Os resultados hierarquizam a área segundo o grau de fragilidade e vulnerabilidade aos processos erosivos, que associadas às análises realizadas no presente estudo, constituem-se em ferramentas orientativas no processo de ordenamento territorial das bacias hidrográficas estudadas.

  13. PODER FEMININO, AUTONOMIA E AIDS: MOTIVAÇÕES PARA GESTAÇÃO DE MULHER SORODISCORDANTE PARA O HIV

    Directory of Open Access Journals (Sweden)

    Elen Soraia de Menezes Cabral

    2012-01-01

    Full Text Available Pocos estudios discuten, a través de la participación y argumentación de los individuos con VIH, situaciones conflictivas acerca de sus derechos reproductivos y del trabajo de equipos de asistencia. El objetivo fue conocer las motivaciones que llevaron una mujer serodiscordante a optar por embarazar por método natural, aunque consciente de los riesgos para madre y feto. Se trata de investigación cualitativa con estudio de caso como estrategia metodológica. El materialismo histórico dialéctico sirvió como referencia teórica para el análisis. Las discusiones se basaron en el modelo de la bioética de principios. Partiendo de los resultados, se reflexionó sobre autonomía como conflicto entre derechos individuales y riesgos para el concepto; género y poder; dependencia y sumisión femenina, además del estigma social con relación a la enfermedad. Se concluyó que los profesionales deben basarse en condiciones históricas y sociales reales, reconociendo la autonomía, los derechos y valores culturales de los envueltos.

  14. BASES PARA LA COMPRENSIÓN ORGANIZATIVA DEL TEXTO

    Directory of Open Access Journals (Sweden)

    Pilar Elena

    2011-10-01

    Full Text Available During the complex process of text reading or analysis, readers must apply their knowledge and strategic capacity in order to reach the maximum degree of textual understanding or inferential understanding. There are a number of factors which may constitute an obstacle to the achievement of this goal, including a lack of knowledge with regard to the specialised nature of the text or to textual structures. This paper focuses on the knowledge of these structures and their relevance in order to achieve good organizational understanding as a basis for inferential understanding. The methodology proposed consists mainly of guided reading based on global and partial text models and text organisation outlines which, through practice, become tools to help readers understand and recall what they have read.Durante el complejo proceso de lectura o análisis del texto, el lector debe aplicar sus conocimientosy su capacidad estratégica para conseguir el grado máximo de comprensión textual o comprensióninferencial. Son varios los factores que pueden influir negativamente en la consecución de tal objetivo, entreellos el desconocimiento del campo de especialidad o de las estructuras textuales. Este trabajo se centraen el conocimiento de estas estructuras y su relevancia para lograr una buena comprensión organizativacomo base para la comprensión inferencial. La metodología que se propone consiste principalmente en unalectura guiada basada en modelos textuales globales y parciales, esquemas de organización textual, que, através de la práctica, se convierten en instrumentos de apoyo para la comprensión y el recuerdo de lo leído.

  15. Producción de microorganismos probióticos como aditivo para alimentos concentrados para ganado vacuno.

    Directory of Open Access Journals (Sweden)

    Edgar Mauricio Vargas.

    2004-11-01

    Full Text Available Por años, las industrias y los laboratorios de investigación han buscado las aplicaciones de los organismos probióticos en animales. El uso de los probióticos como alternativa natural para mejorar el funcionamiento del metabolismo animal; ha demostrado resultados muy interesantes. Modernas granjas utilizan dietas alimenticias (a base probióticos que disminuyen el estrés, aumentan la microflora intestinal, lo que conlleva al animal a aumentar su resistencia a las infecciones (sistema inmunológico. Mejorar la salud animal, rendimiento en peso y funcionamiento metabólico, ha sido siempre la meta para los productores de ganado de carne y leche. Por esta razón el actual estudio fue concebido para evaluar el microencapsulamiento de microorganismos prebióticos (Lactobacillus Thuringenesis y Bifidobacterium Pseudulongum por los métodos de Emulsión y Extrusión. para obtener un alimento para levante de becerros, que ofrecería no solamente las ventajas de un suplemento de la alta calidad, sino también un producto con las ventajas de tener probióticos incorporados. / For years, industries and research labs have investigated probiotics for nonhuman applications. The use of probiotics as an alternative natural way of enhancing animal performance has shown promising results. Modern farm methods which include rearing conditions and diets induce stress and cause changes in the composition of the microflora, which compromises the animal's resistance to infection. The aim of the probiotic approach is to repair the deficiencies in the microflora and restore the animal's resistance to disease. Improving animal health and performance has always been the goal for farm and livestock producers. For this reason the present study was conducted to develop the microencapsulation of Probiotics (Lactobacillus Thuringenesis and Bifidobacterium Pseudulongum by the methods of Emulsion and Extrusion, to obtain a daily diet for calves that could offer not only the

  16. Cubierta de madera para una nave industrial

    Directory of Open Access Journals (Sweden)

    Hossdorf, Heinz

    1958-05-01

    Full Text Available Para la ampliación de los talleres de Hans Schmidlin, de Basilea, Suiza, dedicados a la prefabricación de elementos de construcción de madera y metales ligeros para fachadas, se ha construido una nueva nave, rectangular, de 49x55,4 m en planta.

  17. Programa de conservacion para aves migratorias neotropicales

    Science.gov (United States)

    Deborah Finch; Marcia Wilson; Roberto Roca

    1992-01-01

    Mas de 250 especies de aves terrestres migran a Norte America durante la epoca reproductiva para aprovechar los sistemas templados. No obstante, las aves migratorias neotropicales pasan la mayor parte de su ciclo de vida en los habitat tropicales y subtropicales de paises latinoamericanos y caribefios donde viven en una asociacion cercana con las aves residentes. Para...

  18. "Diseases and natural kinds".

    Science.gov (United States)

    Sulmasy, Daniel P

    2005-01-01

    David Thomasma called for the development of a medical ethics based squarely on the philosophy of medicine. He recognized, however, that widespread anti-essentialism presented a significant barrier to such an approach. The aim of this article is to introduce a theory that challenges these anti-essentialist objections. The notion of natural kinds presents a modest form of essentialism that can serve as the basis for a foundationalist philosophy of medicine. The notion of a natural kind is neither static nor reductionistic. Disease can be understood as making necessary reference to living natural kinds without invoking the claim that diseases themselves are natural kinds. The idea that natural kinds have a natural disposition to flourish as the kinds of things that they are provides a telos to which to tether the notion of disease - an objective telos that is broader than mere survival and narrower than subjective choice. It is argued that while nosology is descriptive and may have therapeutic implications, disease classification is fundamentally explanatory. Sickness and illness, while referring to the same state of affairs, can be distinguished from disease phenomenologically. Scientific and diagnostic fallibility in making judgments about diseases do not diminish the objectivity of this notion of disease. Diseases are things, not kinds. Injury is a concept parallel to disease that also makes necessary reference to living natural kinds. These ideas provide a new possibility for the development of a philosophy of medicine with implications for medical ethics.

  19. 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.

  20. 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

  1. Advisable alternative fuels for Mexico; Combustibles alternativos convenientes para Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar Gonzalez, Jorge Luis [ICA Fluor (Mexico)

    2007-07-15

    The alternative fuels are born with the goal of not damaging the environment; biodiesel, electricity, ethanol, hydrogen, methanol, natural gas, LP gas, are the main alternative fuels. However, the biodiesel and bioetanol are the only completely renewable ones, this makes them ideal to be developed in Mexico, since the agricultural sector could be fortified, the technological independence be favored, improve the conservation of the oil resources and by all means not to affect the environment. On the other hand, also efficient cultivation techniques should be developed to guarantee the economy of the process. [Spanish] Los combustibles alternativos nacen con la meta de no danar el medio ambiente; el biodiesel, electricidad, etanol, hidrogeno, metanol, gas natural, gas LP, son los principales combustibles alternativos. No obstante, el biodiesel y el bioetanol son los unicos completamente renovables, esto los hace ideales para desarrollarse en Mexico, ya que se podria fortalecer el sector agricola, favorecer la independencia tecnologica, mejorar la administracion de los recursos petroleros y por supuesto no afectar al medio ambiente. Por otro lado tambien se tendrian que desarrollar tecnicas de cultivo eficientes para garantizar la economia del proceso.

  2. Methodology for bioclimatic design; Metodologia para el diseno bioclimatico

    Energy Technology Data Exchange (ETDEWEB)

    Morillon Galvez, David [Instituto de Ingenieria de la UNAM, Mexico, D.F. (Mexico)

    2000-07-01

    A methodology for natural air conditioning of buildings is presented; bioclimatic architecture, in order to contribute to the suitable use of components of the building (walls, ceilings, floors, orientations, etc.) that when interacting with the environment takes advantage of it, without deterioration of the same, obtaining energy efficient designs. As well as an analysis of the elements and factors that the architecture must have to be sustainable; an adequate design to the environment, saving and efficient use of energy, the use of alternating energies by means of ecotechnologies and the self-sufficiency. [Spanish] Se presenta una metodologia para la climatizacion natural de edificios; arquitectura bioclimatica, con el objetivo de aportar al uso adecuado de componentes del edificio (muros, techos, pisos, orientaciones, etc.) que al interactuar con el ambiente tome ventaja de el, sin deterioro del mismo, logrando disenos energeticamente eficientes. Asi como un analisis de los elementos y factores que debe tener la arquitectura para ser sustentable; un diseno adecuado al ambiente, ahorro y uso eficiente de la energia, el uso de energias alternas mediante ecotecnologias y la autosuficiencia.

  3. 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...

  4. Natural radiation environment

    International Nuclear Information System (INIS)

    Vohra, K.G.; Mishra, U.C.; Pillai, K.C.; Sadasivan, S.

    1982-01-01

    The volume presented contains papers presented at the Second Special Symposium on Natural Radiation Environment held at Bombay, India, during January 1981. The papers deal with such topics as : 1)high natural radiation background areas; 2)environmental natural radioactivity; 3)measurement techniques; 4)technologically enhanced radioactivity; 5)indoor radiation environment; 6)radon and daughters in ambient air, and 7)applications in Geosciences. Each of the 87 papers presented has been abstracted and indexed for the U.S. Department of Energy Technical Information Center's Energy Data Base

  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. 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.

  7. 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.

  8. Diagrams of natural deductions

    Energy Technology Data Exchange (ETDEWEB)

    Popov, S V

    1982-01-01

    The concept of natural deductions was investigated by the author in his analysis of the complexity of deductions in propositional computations (1975). Here some natural deduction systems are considered, and an analytical procedure proposed which results in a deduction diagram for each system. Each diagram takes the form of an orientated, charge graph, features of which can be used to establish the equivalence of classes of deductions. For each of the natural deduction systems considered, a system of equivalent transformation schemes is derived, which is complete with respect to the given definition of equivalence. 2 references.

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

    OpenAIRE

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

    2005-01-01

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

  10. Cooperación universitaria en redes telemáticas : tres propuestas para una Tele-Universidad Iberoamericana

    OpenAIRE

    Echeverría, Javier

    2000-01-01

    Echeverría, J. (2000). Cooperación universitaria en redes telemáticas: tres propuestas para una Tele-Universidad Iberoamericana. Redes 7(15), 131-138. Las nuevas tecnologías de la información y de las telecomunicaciones (NTIT) posibilitan la creación de un nuevo espacio social para las interrelaciones humanas al que denomino tercer entorno, para distinguirlo del entorno natural y del entorno urbano, es decir del campo y de la ciudad. Dicha transformación puede ser comparada con las grandes...

  11. Barajas-park. Edificios para industria limpia

    Directory of Open Access Journals (Sweden)

    Argeles, J. Ramón

    1990-12-01

    Full Text Available During the last 20 years the concept of BUILDINGS FOR INDUSTRIAL USE has involved and has produced an important change in REAL STATE PRODUCTS. The ergonomic differences between INDUSTRY and SERVICES tend to decrease as far as technological advances are concerned. New Company Management Techniques favor the creation of technical and commercial teams to study projects and products and this highly-qualified personnel requires a comfortable atmosphere and surroundings. Warehousing has also progressed. Stock volumes have been reduced in favor of faster rotation. At present, commercial buildings are designed with interaction functions in mind. The space's sensitivity is translated in an economic diversification process. The objective is to design buildings that attract different types of companies, offering all of them identical efficiency. Facility for development and evolution of the companies, with simple modifications, optimizing internal! and external communications, with provisions for parking. Facility for incorporating diverse and sophisticated services. A building with these characteristics offers: A good location. Good Communications. Good natural lighting. High-quality structural design. Good insulation. Large open interior spaces. Capacity to incorporate sophisticated installations and services. Attractive scenery/views and a good neighborhood.

    En los últimos 20 años ha evolucionado el concepto de Edificios de uso industrial produciendo un importante cambio en los productos inmobiliarios. En tecnologías avanzadas las diferencias ergonómicas entre industria y servicios tienden a reducirse. Nuevas Técnicas de Gerencia Empresarial favorecen que alrededor de proyecto o productos se creen equipos compuestos por técnicos y comerciales; para este personal, altamente cualificado, se necesita crear ambientes y entornos agradables. La función de almacenamiento también ha evolucionado, el volumen de stock se reduce, y a

  12. 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.

  13. 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,...

  14. Sciences & Nature: Submissions

    African Journals Online (AJOL)

    Sciences & nature publish original works in French or in English that have not been ... This page should provide a summary (200 words maximum) in French and English .... one copy of the journal where his article is published, and 10 offprints.

  15. 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...

  16. The Nature of Grammar

    Institute of Scientific and Technical Information of China (English)

    王楠

    2012-01-01

    This paper describes the nature of grammar as "universalness". The universal grammar indicates that all the languages in the world have identical grammar. This is discussed from three aspects, which gives insight into grammar acquisition.

  17. Art, Technology and Nature

    DEFF Research Database (Denmark)

    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......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...

  18. 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...

  19. 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...

  20. 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)