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Sample records for dano genetico inducido

  1. Quantum knowledge for cryptographic reasoning Vincent Danos1

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    Quantum knowledge for cryptographic reasoning Vincent Danos1 and Ellie D'Hondt2 In this paper we investigate security issues of quantum key distribution (QKD) [4] from a knowledge-based perspective. To our quantum networks [1], a formal framework for distributed quantum computations, to describe QKD

  2. Algoritmo genetico para o problema de rotas de cobertura multiveiculo

    E-print Network

    Gomes, Francisco A. M.

    boa solu¸c~ao para a dif´icil tarefa de distribui¸c~ao adequada de viaturas. Tais rotas poderiam ser. Para que o tempo computacional na obten¸c~ao de uma boa solu¸c~ao seja satisfat´orio, vamos consi

  3. Probabilistic Game Semantics VINCENT DANOS

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    of Computation]: Probabilistic computation; F.3.2 [Semantics of Programming Languages]: Denotational semantics General Terms: Languages Additional Key Words and Phrases: Games Semantics, Probabilistic Idealized Algol surely, we'll get the result 1. If, on the other hand, it is meant only that either can happen---but we

  4. Transactions in RCCS Vincent Danos1

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    the evolution can go wrong. One has to ask in addition that participants don't come to wrong decisions, actually a complete view of their context, nor of its possible evolutions. All they can do, is engage in a series of a transaction is that whenever there is a solution, some evolution may find it (i). This is intuitively saying

  5. How liquid is biological signalling? Vincent Danos a

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    transcription where a promoter can be considered to regulate the transcription of the genes it is placed). Preprint submitted to Elsevier 9 October 2008 #12;whatever these genes are, the various domains manipulate domains and bindings explicitly, and as a result highly combinatorial pathways can be formalised

  6. Approximations for stochastic graph rewriting Vincent Danos1

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    Programming Methods Laboratory, EPFL, Lausanne, Switzerland Introduction. We present a method to compute graphs which form the basis of the Kappa language [3]. Recently, the authors have taken again this method rule may be applied in several ways depending on where the left hand side of the rule is matched

  7. Equilibrium and Termination (extended version) Vincent Danos Nicolas Oury

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    ) to the question of whether a continuous-time Markov chain (CTMC) presented as a set graph-rewriting rules has an equilibrium. It follows that the question of whether a computable CTMC is dissipative (ie does not have the notion of equilibrium of a continuous-time Markov chain (CTMC) and that of the traditional concept

  8. GUADALAJARA JALISCO 2005 XLVIII CONGRESO NACIONAL SMF / XVIII REUNION ANUAL AMO Estudio de efectos foto-inducidos en modelos de

    E-print Network

    Aguilar, Guillermo

    sustituir herramientas tradicionales de ese campo por láseres. Estos son fácil de controlar, seguros, efectivos para cortar y remover tejido; el hecho de que en la industria se haya encontrado que los cortes [2]. La misma ventaja referente a los cortes, ha hecho que este tipo de láseres sea utilizado en

  9. N 90, segunda-feira, 13 de maio de 201312 ISSN 1677-7042 Este documento pode ser verificado no endereo eletrnico http://www.in.gov.br/autenticidade.html,

    E-print Network

    Hanazaki, Natalia

    passageiro menor em águas interiores, sem registro de danos am- bientais. Barra dos Coqueiros, Sergipe navegava no rio Sergipe, nas proximidades da praia de Atalaia Nova, Barra dos Coqueiros, SE, sem registro

  10. Board Member Student Campus Total Value Ann Duplessis Berry, Brencia Renee A&M 2,944.30$

    E-print Network

    Stephens, Jacqueline

    Soumokil, Reina Roxanna A&M 17,917.00$ Blake Chatelain Thiels, Joseph A&M 7,228.60$ Blake Chatelain Hunter, Hunter David A&M 5,880.85$ Hank Danos Pippin, Wendy Elizabeth A&M 5,890.85$ Hank Danos Terrebonne, Sierra Robichaux, Beau Anthonly A&M 1,182.80$ Jack Lawton Adler, Daniel Edward A&M 1,182.80$ Jack Lawton Armstrong

  11. THE ETIOLOGY OF SCHIZOPHRENIA—A Review

    PubMed Central

    Ferreira, Antonio J.

    1961-01-01

    The causes and the nature of the psychiatric disorder labeled schizophrenia remain vexingly obscure. Perhaps as an expression of a still extant body-mind controversy, most of the experiments and statements made toward an elucidation of the problem follow one or the other of two opposing postulations: (a) That its origin is genetico-organic; (b) that it is environmental. In a review of the outstanding “facts” for either argument, it is notable that they presuppose not only a difference in theoretical frameworks, but two radically distinct outlooks. This is reflected in therapy, a field in which organicists and environmentalists stand even further apart; the organicist, relying heavily on electroshock and drugs, hopes to counteract a hypothetical body malfunction, and the environmentalist, through psychotherapy, attempts to make it possible for the patient to disentangle his own conflicting feelings and reaction patterns. Between the two an eclectic position seems hardly tenable. For, in spite of voluminous research and speculation, it has not been possible to build a bridge between the two camps and integrate different outlooks which, at times, have brought psychiatry almost to the point of schism. PMID:13699087

  12. Speculum conjugiorum 

    E-print Network

    Alonso de la Vera Cruz, fray, ca. 1507-1584

    2010-12-13

    - I'm bocominc ve"0J disturbed about Jim." "Oh?" Automatically, the Vulcan's eyes rakod tho danoe floor, searching out his ~'irst Offioer, ho gave an almost ine,udible sigh of roliGf as he caught sight of tho fair heM across tho room. Kirk...

  13. Modelling epigenetic information maintenance a Kappa tutorial

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    Modelling epigenetic information maintenance a Kappa tutorial Jean Krivine1 , Vincent Danos2, that of the maintenance of epigenetic information. Our plan is to: - propose in biological and informal terms a repair Epigenetic repair Epigenetic information is encoded in the human genome via a chemical modification of C

  14. QPL 2005 Preliminary Version Distributed measurement-based quantum

    E-print Network

    Selinger, Peter

    measurement-based quantum computa- tions, adopting an agent-based view, such that computations are describedQPL 2005 Preliminary Version Distributed measurement-based quantum computation Vincent Danos 1 locally where possible. Because the network quantum state is in general entangled, we need to model

  15. 1-qubit versus 2-qubit measurement based quantum computing

    E-print Network

    Danos, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

    1-qubit versus 2-qubit measurement based quantum computing Vincent Danos Universit´e Paris 7 & CNRS and universal quantum computing model based on 2-qubit measurements (TQC), which embeds trivially in a model, then measurement, then local corrections. 1 Introduction The basic quantum computing toolkit consists of unitary

  16. Heat and moisture transport in a paper sheet moving over a hot print Paula Andrea Marin Zapataa

    E-print Network

    Eindhoven, Technische Universiteit

    first. Several authors have derived moisture transport models for the final use of paper. DanoHeat and moisture transport in a paper sheet moving over a hot print surface Paula Andrea Marin during the final use of paper is of concern for the printing industry. Knowing the moisture profiles

  17. Screening of Danofloxacin residue in bovine tissue by terbium-sensitized luminescence on C18 sorbent strips

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Danofloxacin (DANO) residue in bovine muscle was screened at 200 ng/g by terbium-sensitized luminescence (TSL) directly measured on 10x6 mm C18 sorbent strips. The analyte was first adsorbed on sorbent surface by immersion in defatted homogenates. After reagent application and desiccation, TSL was d...

  18. The Diversity of Meningococcal Carriage Across the African Meningitis Belt and the Impact of Vaccination With a Group A Meningococcal Conjugate Vaccine

    E-print Network

    MenAfriCar Consortium

    2015-04-09

    Yamuah; Centre de Recherche Médicale et Sanitaire, Niamey, Niger (member of the International Network of Pasteur Institutes): Rahamatou Moustapha Boukary, Jean- Marc Collard (PI), Ibrahim Dan Dano, Ibrahim Habiboulaye, Bassira Issaka, Jean-François Jusot... of meningococcal vaccination on pharyngeal carriage of meningococci. Trop Med Int Health 2007; 12:1409–21. 25. Virji M. Pathogenic neisseriae: surface modulation, pathogenesis and infection control. Nat Rev Microbiol 2009; 7:274–86. 26. Collard JM, Issaka B...

  19. A protocol for storage and long-distance shipment of Mediterranean fruit fly (Diptera: Tephritidae) eggs. 1. Effect of temperature, embryo age , and storage time on survival and quality

    SciTech Connect

    Caceres, C.; Wornoayporn, V.; Islam, S.M.; Ahmad, S.

    2007-03-15

    The operational use of Mediterranean fruit fly (medfly) Ceratitis capitata (Wiedemann), genetic sexing strains in Sterile Insect Technique applications can be maximized by developing methods for effective shipment of eggs. This would enable a central production facility to maintain the relevant mother stocks and large colonies to supply eggs to satellite centers that would mass produce only males for irradiation and release. In order to achieve this, the survival of medfly embryos of different ages was assessed after storage at 5, 10, 15, 20, and 25 deg. C in water for different periods of time. Survival was affected by all 3 variables, i.e., embryo age, water temperature, and length of storage. Storage of embryos at any temperature for 120 h resulted in almost no survival. Controlling the age of the embryo at the time of the temperature treatment is crucial for the success of this procedure. Embryos collected between 0 to 12 h after oviposition and pre-incubated at 25 deg. C for 12 h provide a suitable 72 h window for shipment when maintained between 10 to 15 deg. C. Under these conditions, no significant reductions in survival during all the developmental stages were observed. (author) [Spanish] El uso operacional de cepas de la mosca del mediterraneo Ceratitis capitata (Wiedemann) en las cuales es posible separar los sexos a traves de mecanismos geneticos para su utilizacion en la Tecnica del Insecto Esteril (TIE), puede ser maximizado con el desarrollo de metodos efectivos para el envio y transporte de huevos. Esto permite que un laboratorio de produccion centralizada mantenga las respectivas colonias responsables por la produccion de huevos para este abastecer laboratorios satelites responsables por la produccion masiva de solamente machos para subsiguiente irradiacion y liberacion. Para ser posible esta alternativa fue evaluada la supervivencia de embriones de diferentes edades despues de su almacenamiento en agua a 5, 10, 15, 20 y 25 deg. C por diferentes periodos de tiempo. La supervivencia fue afectada por las 3 variables evaluadas, la edad del embrion, la temperatura del agua y el periodo de almacenamiento. El almacenamiento de los embriones a cualquier temperatura por 120 horas dio como resultado la casi no supervivencia. Una edad controlada de los embriones a tratar es crucial para el exito de este protocolo. Embriones colectados entre 0 a 12 horas despues de la oviposicion y su previa incubacion a 25 deg. C por 12 horas brinda un margen de hasta de 72 horas de duracion del almacenamiento y transporte, siempre y cuando estos se mantengan en una temperatura de entre 10 a 15{sup o}C. En estas condiciones, fue registrada una reduccion no significante de la supervivencia de los diferentes estados de desarrollo. (author)

  20. The Cretaceous-Tertiary boundary biotic crisis in the Basque country

    NASA Technical Reports Server (NTRS)

    Lamolda, M. A.

    1988-01-01

    The Zumaya section has been selected as a classic locality for the study of the Cretaceous-Tertiary (K-T) boundary due to its richness in microfaune, macrofaune, and nannoflora. The sections present similar good conditions for the study of the K-T boundary. The sedimentary rocks of the Uppermost Maastrichtian from the Basque Country are purple or pink marls and marls-tones. Above it is found a clayed bed, 40 to 29 cm thick, grey or dark grey in its basal part, of Lowermost Danian age. Above there is alternation of micritic grey-pink limestones and thin clay beds of Dano-Montian age. The average sedimentation is 7 to 8 times higher during the Upper Maastrichtian than in the Dano-Montian. The macrofauna underwent a decrease since the Campanian and was not found in the last 11 m of the Zumaya section; it was associated with changes in paleoceanographic conditions and primary productivity of the oceans. The microfossil assemblages in the K-T transition allows the recognition of several phases of a complex crisis between two well established planktonic ecosystems. In the Mayaroensis Zone there is a stable ecosystem with 45 to 47 planktonic foraminifera species. The disappearance of A. mayaroensis starts a degradation of the ecosystem. The number of planktonic foraminiera species decreases between 20 and 45 percent. The next phase of the crisis was the result of main extinction events in the planktonic calcareous ecosystem. There are several cretaceous planktonic foraminifera species, probably reworked, whose numbers decrease upward. The next and last phase of the biotic crisis shows a diversification of the ecosystem; the number of planktonic foraminifera is 2 to 3 times higher than before and it is noted the first appearance of Tertiary nannoflora species, while Cretaceous species decrease and persisting species are still the main ones.

  1. Detección y estudio mediante Fluorescencia Inducida por Láser de radicales libres formados por Disociación Multifotónica Infrarroja

    NASA Astrophysics Data System (ADS)

    Santos, M.; Díaz, L.; Torresano, J. A.; Rubio, L.; Samoudi, B.

    Una de las principales aplicaciones actuales de los procesos de disociación multifotónica inducidos por radiación láser infrarroja (DMI) es la producción de radiales libres, con el fin de estudiar sus propiedades cinéticas y espectroscópicas. La disociación de moléculas poliatómicas en el IR con láseres de CO2 tiene lugar desde la superficie de energía molecular mas baja y conduce generalmente a la formación de fragmentos en el estado electrónico fundamental, con diversos grados de excitación vibracional. En el Grupo de Procesos Multifotónicos del Instituto de Estructura de la Materia del C.S.I.C. hemos puesto a punto la técnica de Fluorescencia Inducida por Láser (LIF) para la detección y análisis en tiempo real de los fragmentos producidos en la DMI inducida mediante uno o dos campos láseres de diferentes longitudes de onda. Objetivos de nuestro trabajo han sido el estudio de los canales de disociación mayoritarios y de las especies transitoria producidas, así como de la distribución de energía interna con que éstas son generadas. En particular hemos detectado mediante LIF las especies: C2, CF, CH, SiH2, CF2, CH2, SiHCl, y CF3 a partir de la disociación de, entre otras, las siguientes moléculas: C2H3Br, C3F6, C4H8Si, C2H5ClSi y CH5ClSi. En este trabajo presentamos algunos de los resultados obtenidos mediante el estudio por LIF de estos radicales: estudio temporal de la señal LIF obtenida con determinación de tiempos de vida, espectros de excitación y fluorescencia, temperaturas vibracionales de formación, variación de la intensidad LIF con el tiempo de retraso entre los láseres de disociación y prueba, etc.

  2. Open-field host specificity test of Gratiana boliviana (Coleoptera: Chrysomelidae), a biological control agent of tropical soda apple (Solanaceae) in the United States

    SciTech Connect

    Gandolfo, D.; McKay, F.; Medal, J.C.; Cuda, J.P.

    2007-03-15

    An open-field experiment was conducted to assess the suitability of the South American leaf feeding beetle Gratiana boliviana Spaeth for biological control of Solanum viarum Dunal in the USA. An open-field test with eggplant, Solanum melongena L., was conducted on the campus of the University of Buenos Aires, Argentina, and a S. viarum control plot was established 40 km from the campus. One hundred adult beetles were released in each plot at the beginning of the experiment during the vegetative stage of the plants, and forty additional beetles were released in the S. melongena plot at the flowering stage. All the plants in each plot were checked twice a week and the number of adults, immatures, and eggs recorded. Results showed almost a complete rejection of eggplant by G. boliviana. No noticeable feeding damage was ever recorded on eggplant. The experiment was ended when the eggplants started to senesce or were severely damaged by whiteflies and spider mites. The results of this open-field experiment corroborate previous quarantine/laboratory host-specificity tests indicating that a host range expansion of G. boliviana to include eggplant is highly unlikely. Gratiana boliviana was approved for field release in May 2003 in the USA. To date, no non-target effects have been observed either on eggplant or native species of Solanum. (author) [Spanish] Una prueba de campo fue conducida para evaluar la especificidad del escarabajo suramericano defoliador Gratiana boliviana Spaeth para control biologico de Solanum viarum Dunal en los Estados Unidos. La prueba con berenjena se realizo en el campo experimental de la Universidad de Buenos Aires, Argentina, y una parcela control con S. viarum fue establecida a 40 km. Cien escarabajos adultos fueron liberados en cada parcela al inicio del experimento durante la fase vegetativa, y cuarenta escarabajos adicionales fueron liberados en la parcela de berenjena durante la floracion. Todas las plantas en cada parcela fueron inspeccionadas dos veces a la semana y el numero de adultos, larvas, y posturas fueron registrados. Resultados indicaron un casi completo rechazo de la berenjena por G. boliviana. Ningun dano visible de defoliacion en la berenjena fue detectado. Las pruebas concluyeron cuando las plantas de berenjena alcazaron su madurez o fueron severamente danadas por mosca blanca y acaros. Resultados corroboran previas pruebas de especificidad en laboratorio/cuarentena que indican que la berenjena no es un hospedero de G. boliviana y que la posibilidad de llegar a ser una plaga de este cultivo es muy remota. Gratiana boliviana fue aprobado para ser liberado en el campo en mayo del 2003. Ningun dano ha sido observado hasta la fecha a plantas no blanco. (author)

  3. Analysis of the trade-off between spatial and temporal resources for measurement-based quantum computation

    NASA Astrophysics Data System (ADS)

    Miyazaki, Jisho; Hajdušek, Michal; Murao, Mio

    2015-05-01

    In measurement-based quantum computation (MBQC), elementary quantum operations can be more parallelized than the quantum circuit model by employing a larger Hilbert space of graph states used as the resource. Thus MBQC can be regarded as a method of quantum computation where the temporal resource described by the depth of quantum operations can be reduced compared to the quantum circuit model by using the extra spatial resource described by graph states. To analyze the trade-off relationship of the spatial and temporal resources, we consider a method to obtain quantum circuit decompositions of general unitary transformations represented by MBQC on graph states with a certain underlying geometry called generalized flow. We present a method to translate any MBQC with generalized flow into quantum circuits without extra spatial resource. We also show an explicit way to unravel acausal gates without postselection that appear in the quantum circuit decomposition derived by a translation method [V. Danos and E. Kashefi, Phys. Rev. A 74, 052310 (2006), 10.1103/PhysRevA.74.052310] and that represents an effect of the reduction of the temporal resource in MBQC. Finally, by considering a way to deterministically simulate these acausal gates, we investigate a general framework to analyze the trade-off between the spatial and temporal resources for quantum computation.

  4. Development of an Immunochromatographic Strip Test for Rapid Detection of Ciprofloxacin in Milk Samples

    PubMed Central

    Liu, Liqiang; Luo, Liju; Suryoprabowo, Steven; Peng, Juan; Kuang, Hua; Xu, Chuanlai

    2014-01-01

    A rapid, simple, and sensitive immunochromatographic test strip has been developed for testing residues of ciprofloxacin (CIP). A specific and sensitive monoclonal antibody (mAb) for CIP was generated by immunizing BALB/c mice with well-characterized CIP-Keyhole limpet haemocyanin. Under the optimized conditions, the cut-off limits of test strips for CIP were found to be 5 ng/mL in phosphate-buffered saline and 2.5 ng/mL in milk samples. Each test can be evaluated within 3 min. The cross-reactivities of the CIP test strip to enrofloxacin (ENR), norfloxacin (NOR), nadifloxacin (NDF), danofloxacin (DANO), pefloxacin (PEX), lomefloxacin (LOME), enoxacin (ENO), and sarafloxacin (SAR) were 71.4%, 71.4%, 66%, 50%, 33%, 20%, 12.5%, and 6.25%, respectively. The data indicate that the method is sensitive, specific, and has the advantages of simplicity and speed, therefore, this test strip is a useful screening method for the detection of CIP residues in milk samples. PMID:25211194

  5. Quartet structure in atomic nuclei

    NASA Astrophysics Data System (ADS)

    Fu, G. J.; Zhao, Y. M.; Arima, A.

    2015-05-01

    A quartet is a tightly bound cluster of two protons and two neutrons, similar to the ? particle but occasionally with nonzero spin and/or isospin. If the interaction between two quartets is weak in given states, such states are concluded to be well represented by a quartet structure. In this paper, we study the quartet structure of eight valence nucleons in two cases. The first is a single j shell, demonstrating that the so-called stretch scheme [M. Danos and V. Gillet, Phys. Rev. Lett. 17, 703 (1966), 10.1103/PhysRevLett.17.703] is very good for low-spin states with a quadruple-quadruple interaction, and is reasonably good under realistic interactions. The second case is the ground state of 92Pd in the p1 /2p3 /2f5 /2g9 /2 shell with the JUN45 effective interaction. We show that the quartet correlation is essential in the ground state of 92Pd.

  6. "Estudio tribologico de aceros para moldes. Aplicacion al moldeo por inyeccion de polibutilentereftalato reforzado con fibra de vidrio"

    NASA Astrophysics Data System (ADS)

    Martinez Mateo, Isidoro Jose

    Mould materials for injection moulding of polymers and polymer-matrix composites represent a relevant industrial economic sector due to the large quantity of pieces and components processed. The material selection for mould manufacturing, its composition and heat treatment, the hardening procedures and machining and finishing processes determine the service performance and life of the mould. In the first part of the present study, the relationship between the hardness and microstructure and the wear resistance of mould steels from large blocks has been studied by pin-on-disc tests, studying the main wear mechanisms. In order to determine the surface damage on mould steels under real injection conditions, different commercial steels have been studied by measuring the variation of surface roughness with the number of injected pieces with different reinforcement percentages and different mould geometries, by using optical profilometry and scanning electron microscopy techniques. It was important to determine the variation of surface roughness of the moulded pieces with the number of injection operations. The materials used were polybutyleneterephthalate pure and reinforced with either 20% or 50% glass fibre. For the different mould designs, the evolution of the glass fibre orientation with injection flow has been determined by image analysis and related to roughness changes and surface damage, both of the composite parts and of the mould steel surface. Finally, the abrasion resistance of the composite parts has been studied by scratch tests as a function of the number of injected parts and of the scratch direction with respect to injection flow and glass fibre orientation. Los materiales para moldes de inyeccion de polimeros y materiales compuestos representan un sector economicamente muy relevante debido al gran aumento del numero de componentes fabricados a partir de materiales polimericos obtenidos mediante moldeo por inyeccion. La seleccion del material para la fabricacion del molde, tienen una gran influencia sobre su comportamiento en servicio a lo largo de la vida util del molde. En la primera parte del presente estudio, a partir de ensayos punzon sobre disco, se ha determinado la relacion entre la resistencia al desgaste y la dureza de aceros para moldes obtenidos a partir de bloques de gran espesor, estudiando los principales mecanismos de desgaste que tienen lugar. A continuacion, con el fin de determinar el dano superficial que sufren los aceros para moldes en condiciones reales de inyeccion, se han estudiado distintos tipos de aceros utilizados comercialmente en moldes de inyeccion de polimeros y materiales compuestos, seleccionando las condiciones de operacion para determinar la variacion de la rugosidad superficial del acero en funcion del material inyectado, del numero de operaciones sucesivas de inyeccion y de la orientacion del flujo de inyeccion, mediante tecnicas de perfilometria optica y microscopia electronica de barrido. Ademas del dano superficial sufrido por el acero con el numero de piezas inyectadas, tambien se ha determinado la evolucion de la rugosidad superficial de los materiales inyectados, polibutilentereftalato (PBT) puro y materiales compuestos derivados de PBT por adicion de un 20 o un 50% en peso de fibra de vidrio. En el caso de las piezas inyectadas, se ha caracterizado su microestructura en funcion del flujo de inyeccion y de la densidad de fibra, se han determinado sus propiedades termicas y dinamico-mecanicas, asi como la variacion de la rugosidad superficial de las piezas inyectadas con el numero de operaciones de inyeccion y con la geometria de las distintas secciones de las piezas. Finalmente, se ha evaluado la resistencia a la abrasion de PBT reforzado con un 50% de fibra, en funcion del numero de piezas inyectadas y de la direccion de rayado con respecto a la orientacion del flujo de inyeccion.

  7. Simulação de ejeções de massa coronal

    NASA Astrophysics Data System (ADS)

    Corsini, M. A.; Silva, A. V. R.

    2003-08-01

    Ejeções de massa coronal (EMC) são bolhas gigantes de gás permeadas por campos magnéticos que são ejetadas do Sol durante um período de várias horas. Caso estas ejeções atinjam a Terra, geralmente, causam uma série de distúrbios às comunicações de longa distância e navegação, além de danos a satélites e transformadores. Portanto, é desejável que sejamos capazes de prever quando estas ejeções atingirão a Terra. Para tanto, é necessário um bom entendimento dos mecanismos causadores das ejeções e, principalmente, de como se dá a propagação das EMC e sua interação com o vento solar que permeia o meio interplanetário. Nesse sentido foi desenvolvido um programa computacional para resolver as equações MHD (Magneto-Hidro-Dinâmica) que regem a evolução das EMC. Primeiramente foram estabelecidas as condições necessárias para descrever o vento solar, no estado estacionário, que permeia todo o meio interplanetário. Num primeiro momento, resolveu-se o sistema de equações para o caso do vento isotérmico, conhecida como a solução de Parker, a fim de testarmos o modelo. Então, foi considerado o caso do vento solar com temperatura variável no meio interplanetário. Este resultado foi utilizado como a base de nosso sistema em seu instante inicial. Posteriormente foram feitas as considerações necessárias para descrever a propagação da Ejeção de Massa Coronal. As EMC foram simuladas como um aumento de densidade e temperatura local na coroa solar. A órbita e a posição da Terra foram incluídas no sistema. Os dados gerados possibilitaram uma análise da evolução da EMC pelo meio interplanetário até encontrar-se com a Terra. Os perfis de densidade e temperatura a 1 Unidade Astronômica são comparados com os dados de satélites reportados na literatura.

  8. Making and breaking the sediment record - characterising effects of tsunamis, storms and average conditions on dune erosion and recovery: a forward modelling exploration.

    NASA Astrophysics Data System (ADS)

    Roelvink, Dano; Costas, Susana

    2015-04-01

    Geological records contain a wealth of information about accretionary episodes in the life of a coastal profile, such as age and type of the deposits and circumstances during which the accretion took place; of erosional events mainly the final limit of the erosion and circumstances under which the erosion took place can be estimated. To obtain a more complete picture of the events shaping the sedimentary record and transport processes involved, process-based modelling can be a useful tool (e.g. Apotsos et al., 2011). However, application of such modelling to different types of events remains a challenge. In our presentation we intend to show examples of the effects of different events on the stratigraphic record and to discuss the challenges related to the modelling of each of these types of events. The test site chosen is the Costa da Caparica, south of Lisbon, Portugal. The stratigraphic record and progradation rates of the coastal were obtained combining geophysical (Ground Penetrating Radar) and dating (Optically Stimulating Luminescence) techniques, which document very recent ages for the preserved coastal barrier. Within the record, we focus on a period around the big tsunami of 1755, during which the shoreline experienced a long-term prograding trend with evidence of severe erosion events. Rather than trying to exactly reproduce the stratigraphy observed here, we will carry out exploratory simulations to create 'building blocks' of stratigraphy related to the different types of events, which we can loosely compare with observations reported in Rebelo et al. (2013). The model applied for all simulations is XBeach (Roelvink et al., 2009), which is used in three different modes (no short waves, time-varying wave action balance, stationary wave action balance, respectively) to accommodate the impact of tsunamis, storms, and average conditions; for the latter we include the dune and associated processes in a simplified aeolian transport and response model. In all cases we resolve wave-averaged flows, bed load and suspended load transport and morphology change including avalanching. Results will be presented in terms of both profile change and resulting contribution to stratigraphy, allowing to evaluate the effects of these different building blocks on the stratigraphic record. References: Apotsos, A., G. Gelfenbaum, and B. Jaffe, 2011. Process-based modeling of tsunami inundation and sediment transport, J. Geophys. Res., 116, F01006, doi:10.1029/2010JF001797. Rebêlo, L., Costas, S., Brito, P., Ferraz, M., Prudêncio, M. I. and Burbidge, C., 2013. Imprints of the 1755 tsunami in the Tróia Peninsula shoreline, Portugal In: Conley, D.C., Masselink, G., Russell, P.E. and O'Hare, T.J. (eds.), Proceedings 12th International Coastal Symposium (Plymouth, England), Journal of Coastal Research, Special Issue No. 65, pp. 814-819, ISSN 0749-0208. Dano Roelvink, Ad Reniers, Ap van Dongeren, Jaap van Thiel de Vries, Robert McCall, Jamie Lescinski. Modelling storm impacts on beaches, dunes and barrier islands. Coastal Engineering, Volume 56, Issues 11-12, November-December 2009, Pages 1133-1152

  9. Microbial community diversity associated with moonmilk deposits in a karstic cave system in Ireland

    NASA Astrophysics Data System (ADS)

    Rooney, D.; Hutchens, E.; Clipson, Nick; McDermott, Frank

    2009-04-01

    Microbial ecology in subterranean systems has yet to be fully studied. Cave systems present highly unusual and extreme habitats, where microbial activity can potentially play a major role in nutrient cycling and possibly contribute to the formation of characteristic subaerial structures. How microorganisms actually function in cave systems, and what ecological roles they may perform, has yet to be widely addressed, although recent studies using molecular techniques combined with analytical geochemistry have begun to answer some questions surrounding subterranean microbial ecology (Northup et al., 2003). Moonmilk has a ‘cottage-cheese' like consistency, comprised of fine crystal aggregates of carbonate minerals, commonly calcite, hydromagnesite and gypsum, and is believed to be at least partially precipitated by microbial activity (Baskar et al., 2006). Microbial metabolic processes have been implicated in the formation of moonmilk, probably a result of biochemical corrosion of bedrock under high moisture conditions. Mineral weathering via bacterial activity has become accepted as a major influence on subsurface geochemistry and formation of belowground structures (Summers-Engel et al., 2004). While many studies focus on bacterial communities in subterranean systems, fungal community structure is also likely to be important in cave systems, given the important role fungi play in the transformations of organic and inorganic substrates (Gadd, 2004) and the significant role of fungi in mineral dissolution and secondary mineral formation (Burford et al., 2003). In general, it is agreed that both biotic and abiotic processes influence moonmilk formation, yet the diversity of the microbial community associated with moonmilk formations has not been characterised to date. Ballinamintra Cave (Waterford County, Ireland) is largely protected from human influence due to accessibility difficulties and thereby offers an opportunity to study microbial community structure that has been unaltered by human disturbance or practices. The aim of this study was to examine microbial community diversity associated with moonmilk deposits at Ballynamintra Cave, Ireland using automated ribosomal intergenic spacer analysis (ARISA). The results revealed considerable bacterial and fungal diversity associated with moonmilk in a karstic cave system, suggesting that the microbial community implicated in moonmilk formation may be more diverse than previously thought. These results suggest that microbes may have important functional roles in subterranean environments. Although the moonmilk in this study was largely comprised of calcite, microbial involvement in calcite precipitation could result in the bioavailability of a range of organic compounds for subsequent microbial metabolism. References: Baskar, S., Baskar, R., Mauclaire, L., and McKenzie, J.A. 2006. Microbially induced calcite precipitation in culture experiments: Possible origin for stalactites in Sahastradhara caves, Dehradun, India. Current Science 90: 58-64. Burford, E.P., Fomina, M., Gadd, G. 2003. Fungal involvement in bioweathering and biotrasformations of rocks and minerals. Min Mag 67(6):1172-1155. Engel, A.S., Stern, L.A., Bennett, P.C. 2004. Microbial contributions to cave formation: new insights into sulfuric acid speleogenesis. Geology 32(5): 369-372. Gadd, G.M. (2004). Mycotransformation of organic and inorganic substrates. Mycologist 18: 60-70. Northup, D., Barns, S.M., Yu, Laura, E., Spilde, M.N., Schelble, R.T., Dano, K.E., Crossey, L.J., Connolly, C.A., Boston, P.J., and Dahm, C.N. 2003. Diverse microbial communities inhabiting ferromanganese deposits in Lechuguilla and Spider Caves. Environmental Microbiology 5(11): 1071-1086.

  10. Validation of the Earthquake Archaeological Effects methodology by studying the San Clemente cemetery damages generated during the Lorca earthquake of 2011

    NASA Astrophysics Data System (ADS)

    Martín-González, Fidel; Martín-Velazquez, Silvia; Rodrigez-Pascua, Miguel Angel; Pérez-López, Raul; Silva, Pablo

    2014-05-01

    The intensity scales determined the damage caused by an earthquake. However, a new methodology takes into account not only the damage but the type of damage "Earthquake Archaeological Effects", EAE's, and its orientation (e.g. displaced masonry blocks, conjugated fractures, fallen and oriented columns, impact marks, dipping broken corners, etc.) (Rodriguez-Pascua et al., 2011; Giner-Robles et al., 2012). Its main contribution is that it focuses not only on the amount of damage but also in its orientation, giving information about the ground motion during the earthquake. Therefore, this orientations and instrumental data can be correlated with historical earthquakes. In 2011 an earthquake of magnitude Mw 5.2 took place in Lorca (SE Spain) (9 casualties and 460 million Euros in reparations). The study of the EAE's was carried out through the whole city (Giner-Robles et al., 2012). The present study aimed to a.- validate the EAE's methodology using it only in a small place, specifically the cemetery of San Clemente in Lorca, and b.- constraining the range of orientation for each EAE's. This cemetery has been selected because these damage orientation data can be correlated with instrumental information available, and also because this place has: a.- wide variety of architectural styles (neogothic, neobaroque, neoarabian), b.- its Cultural Interest (BIC), and c.- different building materials (brick, limestone, marble). The procedure involved two main phases: a.- inventory and identification of damage (EAE's) by pictures, and b.- analysis of the damage orientations. The orientation was calculated for each EAE's and plotted in maps. Results are NW-SE damage orientation. This orientation is consistent with that recorded in the accelerometer of Lorca (N160°E) and with that obtained from the analysis of EAE's for the whole town of Lorca (N130°E) (Giner-Robles et al., 2012). Due to the existence of an accelerometer, we know the orientation of the peak ground acceleration and we have been able to constrain the ranges of orientation for each EAE's. The orientation of the damage is not usually recorded after an earthquake; however, it can provide information on seismic source in historical earthquakes. References Giner-Robles, J. L., Perez-Lopez, R., Silva Barroso, P., Rodriguez-Pascua, M. A., Martin-Gonzalez, F. and Cabanas, L. 2012. Analisis estructural de danos orientados en el terremoto de Lorca del 11 de mayo de 2011. Aplicaciones en arqueosismologia. Boletín Geológico y Minero, 123 (4): 503-513 Rodriguez-Pascua, M.A., Perez-Lopez, R., Silva, P.G., Giner- Robles, J.L., Garduno-Monroy, V.H. and Reicherter, K. 2011. A Comprehensive Classification of Earthquake Archaeological Effects (EAE) for Archaeoseismology. Quaternary International, 242, 20-30.