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Sample records for caracterizacao da delta

  1. Isolation and characterization of delta toxin from the venom of Crotalus durissus terrificus; Isolamento e caracterizacao da delta toxina do veneno de Crotalus durissus terrificus

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    Campos, Lucelia de Almeida

    2006-07-01

    The Crotalus durissus terrificus venom has been so far described as being of low complexity, with four major components described: convulxin, gyroxin, crotoxin and crotamine. In recent studies, other components of this venom were characterized as, for example, an analgesic factor. In 1980, Vital Brazil predicted the existence of a toxin which could be involved in platelet aggregation, and named it delta toxin. However, this toxin has never been isolated or characterized. The aim of the present work was to purify and characterize this toxin. After FPLC size exclusion chromatography followed by reverse phase HPLC, an homogeneous fraction was obtained, with a molecular weight of 14,074.92 Da. When analyzed by SOS-PAGE, this toxin presented an anomalous behavior, with a molecular weight of 14 kDa, while in 2D gels, spots around 40 kDa and with an isoelectrical point between 4 and 5 were observed suggesting isoforms with glicosilation microheterogeneity. After trypsin digestion, the fragments were submitted to the swissprot databank showing high homology (43% coverage, 15 matching peptides) with trocarin, a prothrombin activator from Tropidechis carinatus. These data were further confirmed by aminoacid analysis. The toxin was tested for its ability to activate factor II and X using synthetic substrates. Our data indicate a direct activation of factor X. The same toxin also behaved as a potent direct platelet aggregation activator on washed platelets. Assays with specific inhibitors indicate that neither metalloproteinase, nor serinoproteinase or t lectin domains are involved in the aggregating activity, since EDTA, benzamidin and D-galactose did not inhibit the toxin. In the present work, we were able to identify, purify and characterize a new toxin from the brazilian rattlesnake. It behaved as predicted by Vital-Brazil and displayed direct factor X activating properties, also inducing platelet aggregation, even at low concentrations. Our data also indicate that it is

  2. Characterization of a clay from Vitoria da Conquista, Bahia, Brazil, by thermal analysis; Caracterizacao de uma argila de Vitoria da Conquista, BA, por analise termica

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    Oliveira, O.M.; Zandonadi, A.R.; Martins, M.V. Surmani; Carrio, J.A.G.; Munhoz Junior, A.H. [Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil)

    2010-07-01

    Kaolinitic clays are vastly used in ceramic industry. Light coloration burned clays are very useful in the coatings production because of their aesthetic. In this work clay material from Vitoria da Conquista (south-west Bahia, Brazil) was characterized by various techniques. Differential Scanning Calorimetry (DSC) shows a kaolinite characteristic curve with an endothermic peak at 492 deg C, which corresponds to the kaolinite - metakaolinite transformation. Transformation alpha to beta quartz is characterized by a 573 deg C peak. The samples were also characterized by water absorption and x rays powder diffraction. The 1100 deg C burned samples were tested by rupture tension with acceptable results. (author)

  3. Physicochemical characterization of ceramics from Sao Paulo II archaeological site; Caracterizacao fisico-quimica da ceramica do sitio arqueologico Sao Paulo II

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    Ribeiro, Rogerio Baria

    2013-08-01

    Archaeometry is a consolidated field with a wide application of nuclear analytical techniques for the characterization, protection, and restoration of archaeological pieces. This project aimed at studying the elementary chemical composition of 70 ceramic fragments samples from Sao Paulo II archaeological site, located along the Solimoes River channel, next to Coari city, in Brazilian Amazon. The characterization of samples was performed by neutron activation analysis (NAA). By the determination of 24 elements in the ceramic fragments ( Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Sb, Sm. Rb, Se, Ta, Tb, Th, U, Yb and Zn), it was possible to define groups of samples regarding the similarity/dissimilarity in elementary chemical composition. For such a task, the multivariate statistical methods employed were cluster analysis (C A), principal component analysis (PCA) and discriminant analysis (DA). Afterwards, seven ceramic fragments were selected based on the groups previously established, for the characterization of the site temporal horizon. Those ceramic fragments were analyzed by thermoluminescence (TL) and EPR for dating purposes. The firing temperatures were determined by electron paramagnetic resonance (EPR) technique, in order to infer about some aspects of the ceramic manufacture employed by the ancient peoples that lived in Sao Paulo 11. By the results obtained in this study, it was possible to identify the quantity of clay sources employed by the ceramists and the age of the ceramic pieces. Therefore, the results of this research may contribute to the study on the occupation dynamics in the pre-colonial Brazilian Amazon. (author)

  4. O desenvolvimento estratégico internacional da delta cafés

    OpenAIRE

    Oliveira, Rafael João Domingues de

    2014-01-01

    Projeto submetido como requisito parcial para obtenção do grau de Mestre em Gestão / Classificação no sistema de classificações JEL: M10 – General Business Administration; M16 – International Business Administration Num mundo cada vez mais global e competitivo, a importância da estratégia e do desenvolvimento empresarial emerge como aspeto fundamental para o dia-a-dia de uma organização. O presente caso de estudo analisa a indústria do café e, de forma mais detalhada, a Delta ...

  5. Cloning, periplasmic expression, purification and structural characterization of human ribosomal protein L10; Clonagem, expressao, purificacao e caracterizacao estrutural da proteina ribossomal L10 humana recombinante

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    Pereira, Larissa Miranda

    2009-07-01

    The ribosomal protein L10 (RP L10) is a strong candidate to be included in the class of tumor suppressor proteins. This protein, also denominated as QM, is known to participate in the binding of ribosomal subunits 60S and 40S and the translation of mRNAs. It has a molecular weight that varies between 24 and 26 kDa and an isoelectric point of (pI) 10.5. The sequence of the protein QM is highly conserved in mammals, plants, invertebrates, insects and yeast which indicates its critical functions in a cell. As a tumor suppressor, RP L10 has been studied in strains of Wilm's tumor (WT-1) and tumor cells in the stomach, where was observed a decrease in the amount of its mRNA. More recently, the RP L10 was found in low amounts in the early stages of prostate adenoma and showed some mutation in ovarian cancer, what indicates its role as a suppressor protein in the development of these diseases. It has also been described that this protein interacts with c-Jun and c-Yes inhibiting growth factors and consequently, cell division. This work has an important role on the establishment of soluble expression of QM to give base information for further studies on expression that aim to evaluate the specific regions where it acts binding the 60S and 40S ribosomal subunits and translation, as well as its binding to proto-oncogenes. The cDNA for QM protein was amplified by PCR and cloned into periplasmic expression vector p3SN8. The QM protein was expressed in E. coli BL21 (DE3) in the region of cytoplasm and periplasm, the best condition was obtained from the expression of the recombinant plasmid QM p1813{sub Q}M at 25 degree C or 30 degree C, the soluble protein was obtained with small amounts of contaminants. The assays of secondary structure showed that the QM protein is predominantly alpha-helix, but when it loses the folding, this condition changes and the protein is replaced by {beta}- sheet feature. (author)

  6. UMA ABORDAGEM YEAST TWO-HYBRID PARA O ESTUDO DA REPLICAÇÃO E PATOGÉNESE DO VÍRUS DA HEPATITE DELTA

    OpenAIRE

    Casaca, Ana Leonor

    2011-01-01

    O vírus da hepatite delta (HDV) é o agente etiológico de uma das formas mais graves de hepatite viral e é ainda endémico em diversas regiões do globo, nomeadamente em África, na Amazónia e no Extremo Oriente. O HDV co-infecta ou super-infecta hepatócitos infectados com o vírus da hepatite B (HBV) aumentando em cerca de 10 vezes o risco de cirrose e hepatite fulminante. A associação clínica entre os dois vírus deve-se ao facto do invólucro do HDV ser constituído pelos antigénios de superfície ...

  7. Water isotopic characterization of hypersaline formation of a petroleum field Reconcavo basin, Brazil; Caracterizacao isotopica de aguas de formacao hipersalinas de um campo de petroleo da Bacia do Reconcavo, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Teles, Danilo Ribeiro de Sa; Azevedo, Antonio Expedito Gomes de, E-mail: danilosateles@yahoo.com.br, E-mail: expedito@ufba.br [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Fisica. Centro de Pesquisa em Geofisica e Geologia; Santos, Christian Pereira Lopes dos, E-mail: cplsgs@gmail.com [Instituto Federal Baiano, Salvador, BA (Brazil)

    2010-04-15

    Formation water is the water present in reservoir rock pores, produced together with petroleum. Usually it is hyper saline with concentrations that can be higher than 250 g/l of dissolved solids. The concentration of the dissolved elements and the isotopic composition of the water and of some of the dissolved elements can be excellent tracers to study the dynamic of underground fluid flux, the mixing of distinct sources and the origin of salinization of these waters. This work reports the isotopic composition ({delta}{sup 2}H , {delta}{sup 18}O) and electrical conductivity (EC) of formation waters from 10 wells of a petroleum field of the Reconcavo Basin, looking for their evolution, interaction with the minerals and rocks and reservoir interconnection. The samples have electric conductivity ranging from 84 to 137 mS/cm, with conductivity increasing with depth of production zone. It is observed an enrichment of deuterium and oxygen-18 with the depth of production zone, probably due to water-rock interactions that were probably increased by higher temperatures of the deeper levels and longer residence times. The samples from the production zone between 1450 to 1520 m, drained by 7 of the 10 wells sampled, show a small range in isotopic composition and in electric conductivity, indicating homogeneity in this level of the reservoir. In the shallow level of 450 m the values of {delta}{sup 2}H , {delta}{sup 18}O and EC are lower, with isotopic composition similar to the oceanic water, possibly representing the original water that entered the reservoir during the sedimentation of the basin. (author)

  8. B and Delta hepatitis virus infection in a population of West Africa Infecção pelo vírus da hepatite B e Delta em população da África Ocidental

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    N. Zanchetta

    1990-02-01

    Full Text Available Among the 424 serum samples examined, the prevalence of hepatitis virus infection turned out to be 89.6%, with 15.6% of HBsAg positivity. Some of the samples belonged to an afferent population and some other to workers of a West Africa rural hospital (Pop. Rep. of Benin. 27.3% of the positive subjects presented active replication of the virus, shown by the presence of HBeAg. Among the HBcAb positive subjects the anti-delta antibodies showed a positivity frequency of 19.7%. HBsAg presence in 15% of pregnant women suggested the importance of HBV mother-foetal transmission in the district. The examined results can be compared with those obtained in other African areas, with similar socio-economic conditions.Em 424 amostras de soros examinadas, a prevalência da infecção pelo vírus da hepatite B foi de 89,6% com 15,6% de posilividade para o HBsAg. Algumas das amostras pertenciam a uma população aferente e outras a pessoas trabalhando em hospital rural situado na África Ocidental (República Popular de Benin. 27,3% dos indivíduos soro-positivos evidenciaram replicação do vírus como demonstrado pela presença do HBeAg. Nos indivíduos HBcAb positivos, os anticorpos anti-delta foram positivos em uma frequência de 19,7%. A presença de HBsAg em 15% das mulheres gestantes eleva a importância da transmissão de HBV, da mãe para o filho, nesta região. Os resultados apresentados podem ser comparados com aqueles obtidos em outras áreas da África, com condições sócio-econômicas semelhantes.

  9. Rastreamento da fibrose cística usando-se a análise combinada do teste de IRT neonatal e o estudo molecular da mutação deltaF508 Cystic fibrosis screening by two-tiered newborn IRT assay and deltaF508 mutation molecular analysis

    OpenAIRE

    Giselda M.K. Cabello; Cabello, Pedro H.; Silvia R.S. Roig; Armando Fonseca; Eulália C.D. Carvalho; Octavio Fernandes

    2003-01-01

    Um total de 117 cartões de rastreamento neonatal foi selecionado anonimamente para a avaliação de fibrose cística (FC) pela análise da mutação deltaF508 usando-se a técnica da reação em cadeia da polimerase (PCR), seguida de eletroforese em gel de poliacrilamida (Page) e pela quantificação da imunotripsina reativa (IRT, Delfia). Uma concentração de IRT menor que 140ng/ml foi encontrada em 116 recém-nascidos. Entre estes foi detectado um heterozigoto deltaF508 com uma concentração de IRT de 4,...

  10. Characterization of the oligosaccharide structure of human glycosylated prolactin (G-hPRL) native and recombinant; Caracterizacao da estrutura oligossacaridica de prolactina glicosilada humana (G-hPRL) nativa e recombinante

    Energy Technology Data Exchange (ETDEWEB)

    Marcos Vinicius Nucci Capone

    2013-07-01

    Human prolactin (hPRL) is a polypeptide hormone secreted by the anterior pituitary under the regulation of the hypothalamus, involved in a variety of biological processes such as mammary gland development and lactation. The recombinant product is important in medical diagnosis and treatment of failure of lactation. This hormone may occur in the form of non-glycosylated protein (NGhPRL) and glycosylated (G-hPRL) with molecular weights of approximately 23 and 25 kilodalton (kDa), respectively; has a single N-glycosylation site located at asparagine (Asn) position 31, which is partially occupied, thus being a particularly interesting model of glycosylation. The biological activity of G-hPRL is lower compared to NG-hPRL (~4 times) and its physiological function is not well defined: the portion of carbohydrate appears to have an important role in the hormone biosynthesis, secretion, biological activity, and plasma survival of the hormone. The main objective of this study was to compare the structures of N-glycans present in glycosylated pituitary prolactin (G-hPRL-NHPP) with those present in the recombinant. To obtain the recombinant G-hPRL the production was performed in laboratory scale from Chinese hamster ovary cells (CHO), genetically modified and adapted to growth in suspension. Cycloheximide (CHX), whose main effect was to increase the ratio G-hPRL/NG-hPRL from 5% to 38% was added to the culture medium, thereby facilitating the purification of G-hPRL. The G-hPRL was purified in two steps, a cation exchanger followed by a purification by reversed-phase high performance liquid chromatography (RP-HPLC) which demonstrated the efficient separation of the two isoforms of hPRL. Recombinant G-hPRL-IPEN was well characterized by several techniques confirming its purity and biological activity, including comparisons with other reference preparation of pituitary origin purchased from the {sup N}ational Hormone & Peptide Program (NHPPU. S.){sup .} The composition of N

  11. Frequency of the deltaF508 mutation in 108 cystic fibrosis patients in São Paulo: comparison with reported Brazilian data Freqüência da mutação deltaF508 em 108 pacientes com fibrose cística de São Paulo: comparação com dados de estudos brasileiros

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    Thelma Suely Okay

    2005-04-01

    Full Text Available PURPOSE: To analyze the frequency of the delta F508 (deltaF508 deletion mutation in 108 unrelated cystic fibrosis patients and compare the results with the previously reported data for Brazilian patients. Cystic fibrosis is the leading cause of genetic disease in Caucasians, and the deltaF508 deletion is the most common mutation associated with the disease. METHOD: The frequency of the deltaF508 mutation was assessed by means of a polymerase chain reaction (PCR followed by detection in 8% silver-stained polyacrylamide gels. RESULTS: Twenty-three of 108 patients (21.3% were homozygous for the deltaF508 deletion, 50 were heterozygous (46.3%, and the remaining 35 (32.4% were non-carriers. In terms of alleles, there were 96 mutated (96/216 or 44.45% and 120 wild-type ones (120/216 or 55.5%. CONCLUSION: The 44.45% of affected alleles that were found is higher than the 33% first described in 1993, but slightly lower than the 48% recently reported. Moreover, our data corroborated the idea that the frequency of the deltaF508 mutation is lower in Brazil in comparison to that found in studies carried out in Europe and North American (circa 70.0%, probably due to increased racial miscegenation. These findings must be taken into account before any genetic screening of the population is proposed in Brazil.OBJETIVO: Analisar a freqüência da mutação delta F508 (deltaF508 em 108 pacientes não aparentados, com fibrose cística e comparou os resultados com os dados de outros estudos brasileiros. A fibrose cística (CF constitui a doença genética mais comum em populações caucasianas, sendo a deltaF508 a mais freqüente dentre as mutações relacionadas à doença. MÉTODO: A freqüência da deltaF508 foi analisada por meio da Reação em Cadeia da Polimerase (PCR seguida de detecção em géis de poliacrilamida a 8%. RESULTADOS: Vinte e três dos 108 pacientes foram homozigotos para a mutação (21,3%, 50 foram heterozigotos (46,3% e os 35 restantes n

  12. Stratigraphy sequence analysis application for multi scalar characterization of paralic reservoirs - an example in the Guata group (E O-Permian) of the Parana Basin, in the state of Rio Grande do Sul, Brazil; Aplicacao da estratigrafia de sequencias para caracterizacao multiescalar de reservatorios paralicos - um exemplo no Grupo Guata (EO-Permiano) da Bacia do Parana, no Rio Grande do Sul, Brasil

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    Kuechle, Juliano [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil). Inst. de Geociencias. Curso de Pos-graduacao em Geociencias]. E-mail: juk666@zipmail.com.br; Holz, Michael [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil). Inst. de Geociencias]. E-mail: michael.holz@ufrgs.br

    2003-07-01

    Detailed stratigraphic analysis of the Early Permian Rio Bonito and Palermo Formations of the Parana Basin in the region of Sao Gabriel County has been used for a study on reservoir characterization of paralic sandstones. Two main depositional systems were recognized, a fluvial-dominated delta system and a wave-dominated barrier island system. The succession is divided in two third-order depositional sequences, enclosing thirteen fourth-order para sequences. This high-resolution stratigraphic framework was the base for a multi scale approach on reservoir characterization of the sandstone bodies. Reservoir heterogeneities are discussed, staring from the scale of depositional sequence (heterogeneity level 1), passing down to heterogeneity at the scale of systems tracts (heterogeneity level 2) and finalizing with an approach at para sequence scale (heterogeneity level 3). Main control on heterogeneity at the first level is base-level variation as generating mechanism for un conformities at the sediment type and rate. At the second level, the reservoir heterogeneity is controlled by the lateral and vertical variations in thickness of particular systems within the different systems tracts, and at the third level, the heterogeneity occurs controlling reservoir continuity and connectivities between reservoirs. The study supplies a model which is useful as a predictive tool for similar geologic settings in producing oil fields. (author)

  13. Composição e dinâmica da avifauna da usina eólica da praia da Pedra do Sal, Delta do Parnaíba, Piauí, Brasil

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    Anderson Guzzi

    2015-06-01

    Full Text Available RESUMO O impacto dos parques eólicos sobre as aves é um dos temas menos estudados no Brasil, o que contrasta com a importância dessa nova fonte de energia renovável. O presente estudo buscou caracterizar a composição e dinâmica ecológica das espécies de aves residentes e migratórias presentes na área da Usina Eólica da Pedra do Sal, em Parnaíba, Estado do Piauí. O estudo foi desenvolvido por meio de trinta e três amostragens distribuídas em dois ciclos sazonais completos (setembro de 2011 a agosto de 2013, através do método do ponto de escuta, dispostos na base de cada um dos aerogeradores. Foram registrados 6.843 contatos de aves pertencentes a 67 espécies distribuídas em 22 famílias e 13 ordens, e a espécie com maior número de contatos foi a batuíra-de-coleira (Charadrius collaris. As categorias tróficas predominantes foram as das aves insetívoras, representadas por 18 espécies, seguidas pelas aves que se alimentam de invertebrados aquáticos (17 espécies. A maioria das aves registradas é de ambiente aquático. Durante o desenvolvimento desse estudo não foram registradas colisões entre as aves e os aerogeradores.

  14. Delta Phalanx

    OpenAIRE

    Cakmak, Mehmet; Domanic, Unsal; Taser, Omer

    2004-01-01

    A very rarely encountered case of delta phalanx, is presented with is clinical and radiological features as well its result obtained from the surgical treatment. It is stressed that delta phalanx may give rise to various angulations in the digits yet, as is the case in our paper, o delta phalanx case, which leads to aralgus deformity in both thumbs was not encountered in the literature.

  15. Delta Diagrams

    OpenAIRE

    Jablan, Slavik; Kauffman, Louis H.; Lopes, Pedro

    2015-01-01

    We call a Delta Diagram any diagram of a knot or link whose regions (including the unbounded one) have 3, 4, or 5 sides. We prove that any knot or link admits a delta diagram. We define and estimate combinatorial link invariants stemming from this definition.

  16. Determination of the {delta}{sup 13}C (per mille) isotopic rate of the Brazilian beer pilsen type; Determinacao da razao isotopica {delta}{sup 13}C (per mille) de cerveja clara tipo pilsen nacional

    Energy Technology Data Exchange (ETDEWEB)

    Rossete, Alexssandra L.R.M.; Bendassolli, Jose Albertino [Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, SP (Brazil). Lab. de Isotopos Estaveis; Lopes, Fabio [Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, SP (Brazil). Lab. de Ecologia Isotopica; Martinelli, Luiz Antonio [Universidade Estadual de Londrina, PR (Brazil). Dept. de Fisica. Lab. de Fisica Nuclear Aplicada

    2002-07-01

    Beer has been consumed in Brazil since the XIX century. However, at that time, this beverage was imported from England, and the first Brazilian breweries just appeared at the end of the XX century. Basically, beer is made from: malt of barley, Humulus lupulus, water and yeast. In this work, twenty brands of national beer (Pilsen type), and also two different cereals, barley, a C3 metabolism plant, corn, a C4 plant, were analysed to determine their isotope composition {delta}{sup 13} C (per mille) utilizing a mass spectrometer Delta Plus Finigam and Anca S.L. An aliquot of each sample was transferred using a capillary of glass to a tin capsule contends a small amount of sorbitol. The isotope compositions, {delta}{sup 13} C, of barley and corn samples determined were -27.2 and -11.5 per mille, respectively. These results were used to calculate the equation of mixture model. Considering the beer samples, the {delta}{sup 13} C ranged from -18.3 to -23.1 per mille; this result means that the percentage of C3 plant is from 43.3 to 73.9 per mille. In this manner, it is possible to concluded that all beer samples has malted cereals (C4 plant), as far as the low values of C3 plants were presented in these samples as shown through the equation of mixtures model. (author)

  17. Observational $\\Delta\

    CERN Document Server

    Hernández, Antonio García; Monteiro, Mário J P F G; Suárez, Juan Carlos; Reese, Daniel R; Pascual-Granado, Javier; Garrido, Rafael

    2015-01-01

    Delta Scuti ($\\delta$ Sct) stars are intermediate-mass pulsators, whose intrinsic oscillations have been studied for decades. However, modelling their pulsations remains a real theoretical challenge, thereby even hampering the precise determination of global stellar parameters. In this work, we used space photometry observations of eclipsing binaries with a $\\delta$ Sct component to obtain reliable physical parameters and oscillation frequencies. Using that information, we derived an observational scaling relation between the stellar mean density and a frequency pattern in the oscillation spectrum. This pattern is analogous to the solar-like large separation but in the low order regime. We also show that this relation is independent of the rotation rate. These findings open the possibility of accurately characterizing this type of pulsator and validate the frequency pattern as a new observable for $\\delta$ Sct stars.

  18. Golden Delta

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    The Yangtze River Delta, a manufacturing powerhouse,is looking to the tertiary sector for fresh momentum The sprawling U.S. financial melt-down has sent a chill through someof China’s export-oriented regionsas they have shown symptoms of

  19. Delta robot

    OpenAIRE

    J. L. Herder; Van der Wijk, V.

    2010-01-01

    The invention relates to a delta robot comprising a stationary base (2) and a movable platform (3) that is connected to the base with three chains of links (4,5,6), and comprising a balancing system incorporating at least one pantograph (7) for balancing the robot's center of mass, wherein the at least one pantograph has a first free extremity (10) at which it supports a countermass (13) which is arranged to balance the center of mass of the robot.

  20. Delta Hepatitis

    OpenAIRE

    Fulya Gunsar

    2012-01-01

    Hepatitis delta virus (HDV) is a defective RNA virus that requires HBsAg for replication and transmission. It can cause acute or chronic hepatitis. Chronic infection with HDV is one of the most severe and difficult to treat forms of viral hepatitis. It has been estimated that there is a total of 15-20 million HDV carriers in the world. This review focuses on two fundamental aspects of HDV infection. On the one hand, epidemiological data are summarized, which are essential to understand the re...

  1. On $ \\delta $-perfect functions

    OpenAIRE

    C. K. Basu

    2004-01-01

    $ \\delta $-continuous [6] and $ \\delta $-perfect [5] functions are both introduced by T.~Noiri in the similar fashion as continuous and perfect functions. The purpose of the present paper is to investigate several properties of $ \\delta$-perfect functions and also to determine some topological properties which are preserved by $ \\delta$-continuous $ \\delta$-perfect functions.

  2. Hydrogeological characterization of Itataia mine, Ceara, Brazil; Caracterizacao hidrogeologica da jazida de Itataia, CE

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jose Roberto de Alcantara e

    2003-07-01

    This work analyzes the geological-geotechnical-geophysical behavior, aiming to define the characteristics of a karstic-fissural aquifer in the mid-northern region of the State of Ceara, named as Itataia Phosphor-Uranium Deposit. This area is constituted of marbles and gneisses from Itataia Group, which are morphologically located at a higher point to the south and at a lower point to the north, related to Paleoproterozoic Era. Fracture system led to the implantation of two karstic marble phases, being the oldest from Cambrian Period and the most recent from Tertiary/Quaternary Period. Porosity is secondary to fractures, fissures and crushed zones which act as hydraulic channels for groundwater flow. Major geophysics defined conducting lines are controlled by normal fractures and faults in both N70 deg E and N80 deg W directions, and secondarily in both N10 deg E and N30 deg W directions, dipping 70 deg -85 deg into the northern quadrant of the main axes. Fault characteristics are typical of graben and horst patterns. Rocks in the area are distributed into three classes of geotechnical massif: healthy rock, moderately altered and fractured rock, and strongly altered and fractured rock. The latter occurs predominantly in the center of the area, from the soil surface to an average depth of 150 meters. Groundwater flow is characterized by fractures which enlarged by the karstic phenomenon dissolution, and then become closer as deeper they are. This flow may be slower or even discontinue in light of silty-argillaceous alteration material that fill the open fracture gaps. Water level is not lower than 5 m or higher than 90 m, averaging by 30 m ali over the area. The synoptic piezometry map shows a general south-north direction; however in the southwestern portion - the recharge zone - it takes the south direction, while in the southeastern portion it takes the southeast direction. (author)

  3. Generalized \\delta-Derivations

    OpenAIRE

    Kaygorodov, Ivan

    2011-01-01

    We defined generalized \\delta-derivations of algebra A as linear mapping \\chi associated with usual \\delta-derivation \\phi by the rule \\chi(xy)=\\delta(\\chi(x)y+x\\phi(y))=\\delta(\\phi(x)y+x\\chi(y)) for any x,y \\in A. We described generalized \\delta-derivations of prime alternative algebras, prime Lie algebras and superalgebras, unital algebras, and semisimple finite-dimensional Jordan superalgebras. In this cases we proved that generalized \\delta-derivation is a generalized derivation or \\delta...

  4. Abstract Delta Modeling

    OpenAIRE

    Dave Clarke; Michiel Helvensteijn; Ina Schaefer

    2011-01-01

    Delta modeling is an approach to facilitate automated product derivation for software product lines. It is based on a set of deltas specifying modifications that are incrementally applied to a core product. The applicability of deltas depends on feature-dependent conditions. This paper presents abstract delta modeling, which explores delta modeling from an abstract, algebraic perspective. Compared to previous work, we take a more flexible approach with respect to conflicts between modificatio...

  5. Fan deltas and braid deltas: conceptual problems

    Energy Technology Data Exchange (ETDEWEB)

    McPherson, J.G.; Shanmugam, G.; Moiola, R.J.

    1986-05-01

    The concept of fan deltas has been widely misinterpreted in the geologic literature. A true fan delta is defined as an alluvial fan deposited into a standing body of water. Such sequences are of limited areal extent and are, as expected, uncommon in the rock record. By contrast, braid deltas (herein defined), formed by progradation of a braided fluvial system into a standing body of water, are a common geomorphic feature in many modern settings, and their deposits are common in the geologic record. Braid-delta sequences are often identified as fan deltas, on the false premise that coarse-grained deposits in a deltaic setting are always part of an alluvial fan complex. The authors find that most published examples of so called fan deltas contain no direct evidence for the presence of an alluvial fan. Even in examples where an alluvial fan could be documented, the authors found that, in many cases, the alluvial fan complex was far removed from the shoreline, separated by an extensive braid plain. The authors suggest that such systems are better classified as braid deltas. They consider that it is essential to distinguish the environmental setting of true fan deltas from that of braid deltas. Misclassification will lead to incorrect interpretations of expected facies, sandstone geometry, reservoir quality, and tectonic settings. Criteria based on geometry, vertical and lateral lithofacies associations, and paleocurrent patterns should be used to correctly identify and distinguish these depositional systems.

  6. Delta Plaza kohvik = Delta Plaza cafe

    Index Scriptorium Estoniae

    2010-01-01

    Tallinnas Pärnu mnt 141 asuva kohviku Delta Plaza sisekujundusest. Sisearhitektid Tiiu Truus ja Marja Viltrop (Stuudio Truus OÜ). Tiiu Truusi tähtsamate tööde loetelu. Büroohoone Delta Plaza arhitektid Marika Lõoke ja Jüri Okas (AB J. Okas & M. Lõoke)

  7. Incomplete Delta Functions

    OpenAIRE

    Gersten, A.

    1999-01-01

    By applying projection operators to state vectors of coordinates we obtain subspaces in which these states are no longer normalized according to Dirac's delta function but normalized according to what we call "incomplete delta functions". We show that this class of functions satisfy identities similar to those satisfied by the Dirac delta function. The incomplete delta functions may be employed advantageously in projected subspaces and in the link between functions defined on the whole space ...

  8. Engineering Delta Modeling Languages

    OpenAIRE

    Haber, Arne; Hölldobler, Katrin; Kolassa, Carsten; Look, Markus; Müller, Klaus; Rumpe, Bernhard; Schaefer, Ina

    2014-01-01

    Delta modeling is a modular, yet flexible approach to capture spatial and temporal variability by explicitly representing the differences between system variants or versions. The conceptual idea of delta modeling is language-independent. But, in order to apply delta modeling for a concrete language, so far, a delta language had to be manually developed on top of the base language leading to a large variety of heterogeneous language concepts. In this paper, we present a process that allows der...

  9. Profile of yttrium segregation in BaCe{sub 0,9}Y{sub 0,1}O{sub 3-{delta}} as function of sintering temperature; Perfil da segregacao do itrio em BaCe{sub 0,9}Y{sub 0,1}O{sub 3-{delta}} em funcao da temperatura de sinterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Hosken, C.M.; Souza, D.P.F. de, E-mail: camila.hosken@gmail.co [Universidade Federal de Sao Carlos (LAPCEC/UFSCar), SP (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais. Lab. de Preparacao e Caracterizacao Eletrica em Ceramicas

    2010-07-01

    Researches on solid oxide fuel cells indicate barium cerate perovskite as a very attractive material for using as electrolyte due to its high protonic conductivity. The objective of this work is investigate the yttrium segregation during sintering of BaCe{sub 0,9}Y{sub 0,1}O{sub 3-{delta}} doped with Zn O as a sintering aid. The powders were prepared by citrate process. Powders were isostatic pressed into pellets and sintered in air at 1200, 1275, 1325 and 1400 deg C. The samples were characterized by scanning electron microscopy, X-ray diffraction and impedance spectroscopy. Secondary phase containing Yttrium and Cerium was detected as sintering temperature increased. Increase of the lattice parameter and activation energy for electrical conductivity were also detected on samples sintered at 1400 deg C. (author)

  10. Delta hedging strategies comparison

    DEFF Research Database (Denmark)

    De Giovanni, Domenico; Ortobelli, S.; Rachev, S.T.

    2008-01-01

    In this paper we implement dynamic delta hedging strategies based on several option pricing models. We analyze different subordinated option pricing models and we examine delta hedging costs using ex-post daily prices of S&P 500. Furthermore, we compare the performance of each subordinated model...

  11. Delta-confluent Drawings

    OpenAIRE

    Eppstein, David; Goodrich, Michael T.; Meng, Jeremy Yu

    2005-01-01

    We generalize the tree-confluent graphs to a broader class of graphs called Delta-confluent graphs. This class of graphs and distance-hereditary graphs, a well-known class of graphs, coincide. Some results about the visualization of Delta-confluent graphs are also given.

  12. Three-body model calculations of Nucleon-Delta and Delta-Delta dibaryon resonances

    OpenAIRE

    Gal, Avraham; Garcilazo, Humberto

    2014-01-01

    Three-body hadronic models with separable pairwise interactions are formulated and solved to calculate resonance masses and widths of L=0 N-Delta and Delta-Delta dibaryons using relativistic kinematics. For N-Delta, I(JP)=1(2+) and 2(1+) resonances slightly below threshold are found by solving pi-N-N Faddeev equations. For Delta-Delta, several resonances below threshold are found by solving pi-N-Delta Faddeev equations in which the N-Delta interaction is dominated by the 1(2+) and 2(1+) reson...

  13. Pion-assisted Nucleon-Delta and Delta-Delta dibaryons

    OpenAIRE

    Gal, Avraham; Garcilazo, Humberto

    2014-01-01

    N-Delta and Delta-Delta dibaryon candidates are discussed and related quark-based calculations are reviewed. New hadronic calculations of L=0 nonstrange dibaryon candidates are reported. For N-Delta, I(JP)=1(2+) and 2(1+) S-matrix poles slightly below threshold are found by solving pi-N-N Faddeev equations with relativistic kinematics, and for Delta-Delta several S-matrix poles below threshold are found by solving pi-N-Delta Faddeev equations with relativistic kinematics in which the N-Delta ...

  14. Modeling river delta formation

    CERN Document Server

    Seybold, Hansjörg; Herrmann, Hans J

    2007-01-01

    A new model to simulate the time evolution of river delta formation process is presented. It is based on the continuity equation for water and sediment flow and a phenomenological sedimentation/ erosion law. Different delta types are reproduced using different parameters and erosion rules. The structures of the calculated patterns are analyzed in space and time and compared with real data patterns. Furthermore our model is capable to simulate the rich dynamics related to the switching of the mouth of the river delta. The simulation results are then compared with geological records for the Mississippi river.

  15. Modeling river delta formation.

    Science.gov (United States)

    Seybold, Hansjörg; Andrade, José S; Herrmann, Hans J

    2007-10-23

    A model to simulate the time evolution of river delta formation process is presented. It is based on the continuity equation for water and sediment flow and a phenomenological sedimentation/erosion law. Different delta types are reproduced by using different parameters and erosion rules. The structures of the calculated patterns are analyzed in space and time and compared with real data patterns. Furthermore, our model is capable of simulating the rich dynamics related to the switching of the mouth of the river delta. The simulation results are then compared with geological records for the Mississippi River. PMID:17940031

  16. Nucleon to $\\Delta$ and $\\Delta$ form factors in Lattice QCD

    OpenAIRE

    Alexandrou, Constantia

    2011-01-01

    We present recent lattice QCD results on the electroweak nucleon to $\\Delta$ transition and $\\Delta$ form factors using dynamical fermion gauge configurations with a lowest pion mass of about 300 MeV, with special emphasis in the determination of the sub-dominant quadrupole $N\\gamma^*\\rightarrow \\Delta$ and $\\Delta$ electromagnetic form factors.

  17. Boundary Harnack principle for $\\Delta + \\Delta^{\\alpha/2}$

    OpenAIRE

    Chen, Zhen-Qing; Kim, Panki; Song, Renming; Vondraček, Zoran

    2009-01-01

    For $d\\geq 1$ and $\\alpha \\in (0, 2)$, consider the family of pseudo differential operators $\\{\\Delta+ b \\Delta^{\\alpha/2}; b\\in [0, 1]\\}$ on $\\R^d$ that evolves continuously from $\\Delta$ to $\\Delta + \\Delta^{\\alpha/2}$. In this paper, we establish a uniform boundary Harnack principle (BHP) with explicit boundary decay rate for nonnegative functions which are harmonic with respect to $\\Delta +b \\Delta^{\\alpha/2}$ (or equivalently, the sum of a Brownian motion and an independent symmetric $\\a...

  18. Delta-robotin mekaniikkasuunnittelu

    OpenAIRE

    Välimäki, Pasi

    2015-01-01

    Tämän opinnäytetyön tarkoituksena oli suunnitella mekaniikka Delta-robotille, jonka on tarkoitus tulla opetuskäyttöön Seinäjoen ammattikorkeakoululle. Opinnäytetyöhön kuului selvittää, mitä Delta-robotin valmistaminen opetuskäyttöön vaatisi sekä laskea kinematiikka Delta-robotin raajojen ja ala-alustan liikkeille. Lisäksi opinnäytetyössä oli tarkoitus selvittää, mistä materiaalista Delta-robotti olisi kannattavinta valmistaa. Opinnäytetyöhön ei kuitenkaan kuulunut varsinaisen robotin valmista...

  19. geomorphology_delta

    Data.gov (United States)

    California Department of Resources — Surficial geology of the Delta area of California by Brian Atwater of the U.S. Geological Survey. Source maps are from the USGS publication MF-1401. This digital...

  20. Federal Funding in the Delta.

    Science.gov (United States)

    Reeder, Richard J.; Calhoun, Samuel D.

    2002-01-01

    The Lower Mississippi Delta region, especially the rural Delta, faces many economic challenges. The rural Delta has received much federal aid in basic income support and funding for human resource development, but less for community resource programs, which are important for economic development. Federal aid to the Delta is analyzed in terms of…

  1. Modeling river delta formation

    OpenAIRE

    Seybold, Hansjörg; Andrade, José S.; Herrmann, Hans J.

    2007-01-01

    A model to simulate the time evolution of river delta formation process is presented. It is based on the continuity equation for water and sediment flow and a phenomenological sedimentation/erosion law. Different delta types are reproduced by using different parameters and erosion rules. The structures of the calculated patterns are analyzed in space and time and compared with real data patterns. Furthermore, our model is capable of simulating the rich dynamics related to the switching of the...

  2. Delta-Reliability

    OpenAIRE

    Eugster, P.; Guerraoui, R.; Kouznetsov, P.

    2001-01-01

    This paper presents a new, non-binary measure of the reliability of broadcast algorithms, called Delta-Reliability. This measure quantifies the reliability of practical broadcast algorithms that, on the one hand, were devised with some form of reliability in mind, but, on the other hand, are not considered reliable according to the ``traditional'' notion of broadcast reliability [HT94]. Our specification of Delta-Reliability suggests a further step towards bridging the gap between theory and...

  3. Decay of Polarized Delta

    OpenAIRE

    Ramachandran, G.; Venkataraya; Vidya, M. S.; Balasubramanyam, J.; Padmanabha, G.

    2009-01-01

    The resonance $\\Delta(1232)$ with spin-parity ${3 \\over 2}^+$, which contributes dominantly to the reactions like $\\gamma N \\to \\pi N$ and $NN \\to NN\\pi$ at intermediate energies, may be expected to be produced in characteristically different polarized spin states. As such an analysis of the decay of polarized delta is presented, which may be utilized to probe empirically the production mechanism. It is shown that measurements of the angular distributions of the pion and the polarization of t...

  4. The Delta Conjecture

    OpenAIRE

    Haglund, James; Remmel, Jeffrey; Wilson, Andrew Timothy

    2015-01-01

    We conjecture two combinatorial interpretations for the symmetric function $\\Delta_{e_k} e_n$, where $\\Delta_f$ is an eigenoperator for the modified Macdonald polynomials defined by Bergeron, Garsia, Haiman, and Tesler. Both interpretations can be seen as generalizations of the Shuffle Conjecture of Haglund, Haiman, Remmel, Loehr, and Ulyanov. We show how previous work of the third author on Tesler matrices and ordered set partitions can be used to verify several cases of our conjectures. Fur...

  5. Sand-rich deltas

    International Nuclear Information System (INIS)

    This article focuses on the reservoir characteristics of high-energy sand-rich deltas. These form when the wave and tidal action is sufficiently strong to rework the deposits brought in by distributary channels before their burial. The principal types of sand bodies and highest-quality reservoir rocks in a delta are channels and stream-mouth bars. Also present are the sheet sands deposited on a delta front and localized sand bodies left in minor crevasse deposits adjacent to channels during floods. While these bodies have definite areal relationships to one another during the process of building a lobe on the delta, their three-dimensional relationships become complex as the deltas build seaward or shift positions along the shoreline. Thus, a channel active during a later building cycle may cut into or may lie over stream-mouth bars, delta-front sheets, or crevasse sands left earlier. Fortunately, the various sand bodies have different distributions or permeability and different responses to logs so that they can be identified. The coarsest sand is left at the base of a channel and silt and clays are left at the top. Low gamma ray log responses at the bases show that little clay or shale is present. The increased gamma ray log response toward the tops of the channels reflects the presence of more clay and shale

  6. Possible $\\Delta\\Delta$ dibaryons in the quark cluster model

    OpenAIRE

    Q. B. Li; Shen, P. N.

    1999-01-01

    In the framework of RGM, the binding energy of one channel $\\Delta\\Delta_{(3,0)}$($d^*$) and $\\Delta\\Delta_{(0,3)}$ are studied in the chiral SU(3) quark cluster model. It is shown that the binding energies of the systems are a few tens of MeV. The behavior of the chiral field is also investigated by comparing the results with those in the SU(2) and the extended SU(2) chiral quark models. It is found that the symmetry property of the $\\Delta\\Delta$ system makes the contribution of the relativ...

  7. Characterization of AA7050 aluminium alloy processed by ECAP; Caracterizacao da liga de aluminio AA7050 processada por ECAP

    Energy Technology Data Exchange (ETDEWEB)

    Cardoso, K.R.; Guido, V. [Universidade do Vale do Paraiba (UNIVAP), Sao Jose dos Campos, SP (Brazil). Inst. de Pesquisa e Desenvolvimento; Travessa, D.N. [Empresa Brasileira de Aeronautica (EMBRAER), Sao Jose dos Campos, SP (Brazil); Jorge Junior, A.M. [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    The commercial AA7050 aluminium alloy in the solution heat treated condition (W) was processed by ECAP through route A. Two pressing temperatures (room and 150 deg C and velocities (5 and 30mm/min) were used, as well as different number of passes. The effect of such variables on the microstructure evolution was evaluated using optical and transmission electron microscopy with EDX microanalysis, and xray diffraction. It was found that the microstructure has been refined by ECAP, as a result of subgrains formed within deformation bands. ECAP at 150 deg C resulted in intense precipitation of plate like {eta} phase, which evolves to equiaxial morphology as the number of passes increases. (author)

  8. Preparation and characterization of hybrid materials from natural chrysotile; Preparacao e caracterizacao de materiais hibridos a partir da crisotila natural

    Energy Technology Data Exchange (ETDEWEB)

    Giraldelli, M.G.; Silva, M.L.C.P., E-mail: marciogiraldelli@hotmail.co [Universidade de Sao Paulo (EEL/USP), Lorena, SP (Brazil). Escola de Engenharia

    2010-07-01

    Special attention has been given to the development of new materials from natural chrysotile. This fiber has about 40% silicon oxide in its structure with an outer layer of brucite (MgOH{sub 2}). With the aim of obtaining a material with a more uniform structure, acid leaching was performed to remove the outer layer of brucite, resulting in a silicon oxide hydrate. This material was used as support for the deposition of Nb{sub 2}O{sub 5}.nH{sub 2}O. The Nb{sub 2}O{sub 5}.nH{sub 2}O was prepared by conventional precipitation using as starting material niobium metallic. In this study, we performed the synthesis and characterization of the material SiO{sub 2}.nH{sub 2}O / Nb{sub 2}O{sub 5}.nH{sub 2}O 1:1. Both chrysotile as niobium are widely available national resources, which confirms the economic viability of resource use. The materials studied were characterized by XRD, SEM and TG/DTG. (author)

  9. Characterization of electric arc furnace dust aiming reuse; Caracterizacao da poeira de aciaria eletrica visando o seu reaproveitamento

    Energy Technology Data Exchange (ETDEWEB)

    Grillo, F.F.; Oliveira, E.B.G.; Oliveira, J.R. de, E-mail: fgrillo@ifes.edu.b [Instituto Federal de Ciencia e Tecnologia do Espirito Santo (IFES), Vitoria, ES (Brazil); Telles, V.B.; Tenorio, J.A.S. [Universidade de Sao Paulo (USP), SP (Brazil)

    2010-07-01

    This work aims to study the characterize of steelmaking dust, from the primary refining of steel in Electric Arc Furnace, in order to verify feasibility of reuse through the addition of hot metal in the form of briquette. The techniques used to characterize the dust was chemical analyses, size separation tests, X-ray diffraction analyses (XRD), Scanning Electron Microscopy (SEM). After characterization, was the calculation of reductant considering the complete reduction of iron oxides and then to briquetting. The waste sample is composed essentially of spherical particles and has a very small particle size (85% below 10 {mu}m). The XRD has presented compounds such as ZnFe{sub 2}O{sub 4}, Fe{sub 3}O{sub 4}, ZnO e SiO{sub 2}. This work showed that its possible recovery approximately 92% of metal iron from dust generated during steelmaking.This (author)

  10. Characterization of ionizing radiation effects on human skin allografts; Caracterizacao dos efeitos da radiacao ionizante em pele humana para aloenxerto

    Energy Technology Data Exchange (ETDEWEB)

    Bourroul, Selma Cecilia

    2004-07-01

    The skin has a fundamental role in the viability of the human body. In the cases of extensive wounds, allograft skin provides an alternative to cover temporarily the damaged areas. After donor screening and preservation in glycerol (above 85%), the skin can be stored in the Skin Banks. The glycerol at this concentration has a bacteriostatic effect after certain time of preservation. On the other hand, skin sterilization by ionizing radiation may reduces the quarantine period for transplantation in patients and its safety is considered excellent. The objectives of this work were to establish procedures using two sources of ionizing radiation for sterilization of human skin allograft, and to evaluate the skin after gamma and electron beam irradiation. The analysis of stress-strain intended to verify possible effects of the radiation on the structure of preserved grafts. Skin samples were submitted to doses of 25 kGy and 50 kGy in an irradiator of {sup 60}Co and in an electron beam accelerator. Morphology and ultra-structure studies were also accomplished. The samples irradiated with a dose of 25 kGy seemed to maintain the bio mechanic characteristics. The gamma irradiated samples with a dose of 50 kGy and submitted to an electron beam at doses of 25 kGy and 50 kGy presented significant differences in the values of the elasticity modulus, in relation to the control. The analysis of the ultramicrographies revealed modifications in the structure and alterations in the pattern of collagen fibrils periodicity of the irradiated samples. (author)

  11. Clinical, radiographic and scintigraphic aspects of the trapeziometacarpal osteoarthritis; Caracterizacao clinica, radiografica e cintilografica da osteoartrose trapeziometacarpiana

    Energy Technology Data Exchange (ETDEWEB)

    Kaziyama, Helena Hideko Seguchi

    1996-12-31

    Trapeziometacarpal osteoarthritis occurs mainly in women during the menopausal period. It is related to manual activities and is usually bilateral. The onset is insidious and the evolution is slow and progressive. It is characterized by of strength and pain in the basis of the thumb resulting in limitation of the use and function of the hand. The diagnosis of this condition is based on the physical examination. The manouver of compression axial-rotation of the trapezimetacarpal joint is a common positive finding. Typical findings of osteoarthritis are present in the radiological studies. Scintigraphic images have a predictive value. The early diagnosis is important to avoid the risk factors and to prevent disabilities of the hand. (author) 102 refs., 18 figs., 10 tabs.

  12. Horizontal Symmetries $\\Delta(150)$ and $\\Delta(600)$

    OpenAIRE

    Lam, C. S.

    2013-01-01

    Using group theory of mixing to examine all finite subgroups of SU(3) with an order less than 512, we found recently that only the group $\\Delta(150)$ can give rise to a correct reactor angle $\\th_{13}$ of neutrino mixing without any free parameter. It predicts $\\sin^22\\th_{13}=0.11$ and a sub-maximal atmospheric angle with $\\sin^22\\th_{23}=0.94$, in good agreement with experiment. The solar angle $\\th_{12}$, the CP phase $\\d$, and the neutrino masses $m_i$ are left as free parameters. In thi...

  13. Delta-Sigma Beamforming

    OpenAIRE

    2005-01-01

    Systems where data is collected using arrays of sensors will usually contain a beamformer. When the number of active channels in the sensor array is large, as it often is in imaging systems like sonar and medical ultrasound, the beamformer can be both physically large and expensive. To counteract one or both of these unwanted effects, several compact beamforming solutions have been suggested. Delta-sigma based beamforming is one such technique, where 1-bit delta-sigma A/D converters are used ...

  14. Delta G from Compass

    OpenAIRE

    Kurek, Krzysztof

    2006-01-01

    Measurements of the gluon polarization $\\frac{\\Delta G}{G}$ via the open charm channel and based on the helicity asymmetry of large transverse-momentum hadrons in the final state are presented. The data have been collected in the years 2002-2004 by the COMPASS experiment at CERN using a 160 GeV/c polarized muon beam scattered off a polarized $^6$LiD target. The new result for $\\frac{\\Delta G}{G}$ from the charm channel is $-0.57 \\pm 0.41 (stat.)$ at $x_G \\simeq 0.15$ and scale $\\mu^2 \\simeq 1...

  15. Dimension reduction for $-\\Delta_1$

    OpenAIRE

    Amendola, Maria Emilia; Gargiulo, Giuliano; Zappale, Elvira

    2012-01-01

    A 3D-2D dimension reduction for $-\\Delta_1$ is obtained. A power law approximation from $-\\Delta_p$ as $p \\to 1$ in terms of $\\Gamma$- convergence, duality and asymptotics for least gradient functions has also been provided.

  16. More About Donsker's Delta Function

    OpenAIRE

    Lascheck, Angelika; Leukert, Peter; Streit, Ludwig; Westerkamp, Werner

    2003-01-01

    We discuss Donsker's delta function within the framework of White Noise Analysis, in particular its extension to complex arguments. With a view towards applications to quantum physics we also study sums and products of Donsker's delta functions.

  17. Remarks on the Delta(+) mass

    OpenAIRE

    Workman, Ron

    1997-01-01

    We question the reliability of current estimates for the Delta(+) mass. We explain why the standard value, determined from pion photoproduction, should not be used in conjunction with present estimates for the Delta(++) and Delta(0) masses, determined from pion-nucleon scattering. The resultant mass splittings are internally inconsistent. We also briefly comment on discrepancies found when `theoretical' and `experimental' values for the Delta masses are compared.

  18. Using delta-front bathymetry to understand river delta progradation

    Science.gov (United States)

    Shaw, J. B.; Mohrig, D. C.

    2010-12-01

    We investigate the delta-front bathymetry of the Wax Lake Delta in Louisiana, USA; a sand rich river delta prograding quickly (~100 m/yr) into a shallow (~2.5 m) basin. The delta-front is the zone separating the bottomset from the topset of the delta. Bottomset sedimentation covers the bed evenly whereas topset sediment transport is focused by flow through distributary channels. The delta front connects these two disparate transport regimes and has a profound effect on channel-network evolution and sedimentary structure of river deltas. Predictions of delta-front topography made by models of delta progradation have rarely been compared to the bathymetry of field-scale deltas. We have mapped 60 km2 of delta front bathymetry immediately seaward of two sub-aerial distributary channels. Subaqueous channels extend up to 2 km seaward of their subaerial portions. These channels lose definition at their distal ends through a combination of channel-bed shoaling and loss of bank relief. Little bathymetric relief is observed at the fronts of the subaqueous channels, calling into question the role of channel-mouth bars in generating the bifurcations observed in this delta-channel network. Near the subaerial to subaqueous transition, steep and eroding sidewalls transition to constructional banks with gentle grades. Grab samples of bed material have been collected throughout the study area in order to detect proximal to distal fining and to constrain the shear stresses connected with delta-front sedimentation. A better understanding of sediment transport in the delta front and its affiliated patterns of erosion and deposition is essential for progress in understanding how river deltas prograde and fill their basins.

  19. Delta-ALA urine test

    Science.gov (United States)

    Delta-aminolevulinic acid ... This test looks for an increased level of delta-ALA. It may be used to help diagnose ... An increased level of urinary delta-ALA may indicate: Lead poisoning ... level may occur with chronic (long-term) liver disease .

  20. The Devil's in the Delta

    Science.gov (United States)

    Luyben, William L.

    2007-01-01

    Students frequently confuse and incorrectly apply the several "deltas" that are used in chemical engineering. The deltas come in three different flavors: "out minus in", "big minus little" and "now versus then." The first applies to a change in a stream property as the stream flows through a process. For example, the "[delta]H" in an energy…

  1. {\\Delta}- convergence on time scale

    OpenAIRE

    Seyyidoglu, M. Seyyit; Tan, N. Özkan

    2011-01-01

    In the present paper we will give some new notions, such as {\\Delta}-convergence and {\\Delta}-Cauchy, by using the {\\Delta}-density and investigate their relations. It is important to say that, the results presented in this work generalize some of the results mentioned in the theory of statistical convergence.

  2. Kinetics of delta antigen and delta antibody in acute delta hepatitis: evaluation with different enzyme immunoassays.

    OpenAIRE

    Dubois, F.; Goudeau, A

    1988-01-01

    The kinetics of delta antigen (HDAg) and anti-delta antibody (anti-HD) was analyzed in 22 acute delta hepatitis infections (11 coinfections and 11 superinfections), with an enzyme immunoassay developed by Organon Teknika and with two commercially available assays: Deltassay, a test for HDAg from Noctech and Abbott anti-delta enzyme immunoassay, a test for anti-HD from Abbott Laboratories. In seven cases, HDAg was detected with the Organon assay but not with Deltassay. These discrepancies were...

  3. DELTAS: A new Global Delta Sustainability Initiative (Invited)

    Science.gov (United States)

    Foufoula-Georgiou, E.

    2013-12-01

    Deltas are economic and environmental hotspots, food baskets for many nations, home to a large part of the world population, and hosts of exceptional biodiversity and rich ecosystems. Deltas, being at the land-water interface, are international, regional, and local transport hubs, thus providing the basis for intense economic activities. Yet, deltas are deteriorating at an alarming rate as 'victims' of human actions (e.g. water and sediment reduction due to upstream basin development), climatic impacts (e.g. sea level rise and flooding from rivers and intense tropical storms), and local exploration (e.g. sand or aggregates, groundwater and hydrocarbon extraction). Although many efforts exist on individual deltas around the world, a comprehensive global delta sustainability initiative that promotes awareness, science integration, data and knowledge sharing, and development of decision support tools for an effective dialogue between scientists, managers and policy makers is lacking. Recently, the international scientific community proposed to establish the International Year of Deltas (IYD) to serve as the beginning of such a Global Delta Sustainability Initiative. The IYD was proposed as a year to: (1) increase awareness and attention to the value and vulnerability of deltas worldwide; (2) promote and enhance international and regional cooperation at the scientific, policy, and stakeholder level; and (3) serve as a launching pad for a 10-year committed effort to understand deltas as complex socio-ecological systems and ensure preparedness in protecting and restoring them in a rapidly changing environment. In this talk, the vision for such an international coordinated effort on delta sustainability will be presented as developed by a large number of international experts and recently funded through the Belmont Forum International Opportunities Fund. Participating countries include: U.S., France, Germany, U.K., India, Japan, Netherlands, Norway, Brazil, Bangladesh

  4. EEHG at DELTA

    International Nuclear Information System (INIS)

    We present first studies of the realization of the echo-enabled harmonic generation (EEHG) technique proposed by G. Stupakov (2009) as an upgrade of the present coherent harmonic generation (CHG) project at the DELTA storage ring. The generation of short wavelengths with CHG is limited to harmonic numbers of approximately 7. Using the EEHG scheme one can easily reach e. g. the 24th harmonic. In addition to the optical klystron used for CHG, a third undulator is needed for a second energy modulation of the electron bunch, which is followed by an additional strong dispersive section. The architecture of the DELTA storage ring allows for the realization of this technique due to some presently unused space upstream of the optical klystron.

  5. Conservative delta hedging

    OpenAIRE

    Mykland, Per Aslak

    2000-01-01

    It is common to have interval predictions for volatilities and other quantities governing securities prices. The purpose of this paper is to provide an exact method for converting such intervals into arbitrage based prices of financial derivatives or industrial or contractual options.We call this procedure conservative delta hedging. The proposed approach will permit an institution’s management a greater oversight of its exposure to risk.

  6. Thermodynamics of Delta resonances

    OpenAIRE

    Weinhold, W; Friman, B.; Nörenberg, W.

    1997-01-01

    The thermodynamic potential of a system of pions and nucleons is computed including the piN interactions in the P33 channel. A consistent treatment of the width of the resonance in this channel, the Delta(1232) resonance, is explored in detail. In the low-density limit we recover the leading term of the virial expansion for the thermodynamic potential. An instructive diagrammatic interpretation of the contributions to the total baryon number is presented. Furthermore, we examine within a fire...

  7. {\\delta}N formalism

    OpenAIRE

    Sugiyama, Naonori S.; Komatsu, Eiichiro; Futamase, Toshifumi

    2012-01-01

    Precise understanding of nonlinear evolution of cosmological perturbations during inflation is necessary for the correct interpretation of measurements of non-Gaussian correlations in the cosmic microwave background and the large-scale structure of the universe. The "{\\delta}N formalism" is a popular and powerful technique for computing non-linear evolution of cosmological perturbations on large scales. In particular, it enables us to compute the curvature perturbation, {\\zeta}, on large scal...

  8. Square and Delta reflection

    OpenAIRE

    Fontanella, Laura; Hayut, Yair

    2016-01-01

    Starting from infinitely many supercompact cardinals, we force a model of ZFC where $\\aleph_{\\omega^2+1}$ satisfies simultaneously a strong principle of reflection, called $\\Delta$-reflection, and a version of the square principle, denoted $\\square(\\aleph_{\\omega^2+1}).$ Thus we show that $\\aleph_{\\omega^2+1}$ can satisfy simultaneously a strong reflection principle and an anti-reflection principle.

  9. Pion-assisted $N\\Delta$ and $\\Delta\\Delta$ dibaryons, and beyond

    OpenAIRE

    Gal, Avraham

    2014-01-01

    Experimental evidence for $I(J^P)=0(3^+)$ $\\Delta\\Delta$ dibaryon ${\\cal D}_{03}(2370)$ has been presented recently by the WASA-at-COSY Collaboration. Here I review new hadronic-basis Faddeev calculations of $L=0$ nonstrange pion-assisted $N\\Delta$ and $\\Delta\\Delta$ dibaryon candidates. These calculations are so far the only ones to reproduce the relatively small ${\\cal D}_{03}(2370)$ width of 70--80 MeV. Predictions are also given for the location and width of ${\\cal D}_{30}$, the $I(J^P)=3...

  10. Hermite normal forms and $\\delta$-vector

    OpenAIRE

    Hibi, Takayuki; Higashitani, Akihiro; Li, Nan

    2010-01-01

    Let $\\delta(\\Pc) = (\\delta_0, \\delta_1,..., \\delta_d)$ be the $\\delta$-vector of an integral polytope $\\Pc \\subset \\RR^N$ of dimension $d$. Following the previous work of characterizing the $\\delta$-vectors with $\\sum_{i=0}^d \\delta_i \\leq 3$, the possible $\\delta$-vectors with $\\sum_{i=0}^d \\delta_i = 4$ will be classified. And each possible $\\delta$-vectors can be obtained by simplices. We get this result by studying the problem of classifying the possible integral simplices with a given $\\...

  11. Natural processes in delta restoration: application to the Mississippi Delta.

    Science.gov (United States)

    Paola, Chris; Twilley, Robert R; Edmonds, Douglas A; Kim, Wonsuck; Mohrig, David; Parker, Gary; Viparelli, Enrica; Voller, Vaughan R

    2011-01-01

    Restoration of river deltas involves diverting sediment and water from major channels into adjoining drowned areas, where the sediment can build new land and provide a platform for regenerating wetland ecosystems. Except for local engineered structures at the points of diversion, restoration mainly relies on natural delta-building processes. Present understanding of such processes is sufficient to provide a basis for determining the feasibility of restoration projects through quantitative estimates of land-building rates and sustainable wetland area under different scenarios of sediment supply, subsidence, and sea-level rise. We are not yet to the point of being able to predict the evolution of a restored delta in detail. Predictions of delta evolution are based on field studies of active deltas, deltas in mine-tailings ponds, experimental deltas, and countless natural experiments contained in the stratigraphic record. These studies provide input for a variety of mechanistic delta models, ranging from radially averaged formulations to more detailed models that can resolve channels, topography, and ecosystem processes. Especially exciting areas for future research include understanding the mechanisms by which deltaic channel networks self-organize, grow, and distribute sediment and nutrients over the delta surface and coupling these to ecosystem processes, especially the interplay of topography, network geometry, and ecosystem dynamics. PMID:21329199

  12. Delta Hepatitis in Denver

    OpenAIRE

    Rector, William G.; Govindarajan, Sugantha; Penley, Kent A.; Judson, Franklyn N.

    1988-01-01

    The prevalence of hepatitis D virus (HDV) infection in patients with hepatitis B virus (HBV) infection in the mid-United States is not well defined. We tested 65 patients seen between 1983 and 1986 with HBV infection in Denver for evidence of coexisting HDV infection. Five patients had anti-delta (δ) antibody. The prevalence of HDV infection was higher in patients with chronic hepatitis B (4/37) than in patients with acute hepatitis B (1/28). The prevalence of HDV infection in male homosexual...

  13. (Sigma-Delta) Codes

    OpenAIRE

    Boulagouaz, M.; Leroy, A

    2013-01-01

    In this paper we introduce the notion of cyclic ($f(t),\\sigma,\\delta$)-codes for $f(t)\\in \\Ore$. These codes generalize the $\\theta$-codes as introduced by D. Boucher, F. Ulmer, W. Geiselmann \\cite{BGU}. We construct generic and control matrices for these codes. As a particular case the ($\\si,\\de$)-$W$-code associated to a Wedderburn polynomial are defined and we show that their control matrices are given by generalized Vandermonde matrices. All the Wedderburn polynomials of $\\mathbb F_q[t;\\t...

  14. $delta$-Quasi Cauchy Sequences

    OpenAIRE

    Cakalli, Huseyin

    2010-01-01

    Recently, a concept of forward continuity and a concept of forward compactness are introduced in the senses that a function $f$ is forward continuous if $\\lim_{n\\to\\infty} \\Delta f(x_{n})=0$ whenever $\\lim_{n\\to\\infty} \\Delta x_{n}=0$,\\; and a subset $E$ of $\\textbf{R}$ is forward compact if any sequence $\\textbf{x}=(x_{n})$ of points in $E$ has a subsequence $\\textbf{z}=(z_{k})=(x_{n_{k}})$ of the sequence $\\textbf{x}$ such that $\\lim_{k\\to \\infty} \\Delta z_{k}=0$ where $\\Delta z_{k}=z_{k+1}...

  15. Bonds futures: Delta? No gamma!

    OpenAIRE

    Henrard, Marc

    2006-01-01

    Bond futures are liquid but complex instruments. Here they are analysed in a one-factor Gaussian HJM model. The in-the-model delta and out-of-the-model delta and gamma are studied. An explicit formula is provided for in-the-model delta. The out-of-the-model delta and gamma are equivalent to partial derivatives with respect to discount factors. In particular cases the derivative can not be obtained by standard techniques. The same situations lead to cases where the gammas (second order partial...

  16. The importance of using diffraction of X ray in clays characterization; A importancia da utilizacao da difracao de raios X na caracterizacao de argilas

    Energy Technology Data Exchange (ETDEWEB)

    Piccoli, R.; Nascimento, G.C.; Vitoretti, P.P.; Wernck, A.S.W., E-mail: rosaura@sc.senai.b [SENAI, Criciuma, SC (Brazil). Centro de Tecnologia em Ceramica; Perdona, C.R. [Universidade Barriga Verde, Cocal do Sul, SC (Brazil). Curso de Engenharia Ceramica; Perucchi, P. [Universidade do Extremo Sul Catarinense, Criciuma, SC (Brazil). Curso de Ciencia e Engenharia de Materiais

    2009-07-01

    The objective of this work is to demonstrate how the identification of crystalline phases and deg of crystallinity by diffractometry technique of X-ray (XRD) combined with chemical analysis of a sample can help in the study and characterization of raw materials, mainly those used in ceramic compositions. This study also aims to address the inherent limitations of this technique in relation to types of crystalline phases present in the sample of interest for analysis. (author)

  17. Fishing activity characterization in areas under influence of seismic activity; Caracterizacao da atividade pesqueira em areas sob influencia da atividade sismica

    Energy Technology Data Exchange (ETDEWEB)

    Fuse, Izabel Yukimi; Zanella, Joao Francisco Illa Font; Eliseire Junior, Dirceu; Pereira, Edisio [Hidrosfera Oceanografia e Meio Ambiente, Rio de Janeiro, RJ (Brazil); Souza, Sergio Augusto Coelho de; Ferraz, Alexandre; Costa, Leandro Soares da; Vidal, Leonardo; Duppre, Mauricio [Okeanos Consultoria e Meio Ambiente Ltda. (Brazil); Uller, George [CGG do Brasil, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    Seismic surveys are an important method in prospecting for oil and gas reservoirs in the marine environment. The ELPN/IBAMA has required that companies develop an adequate social programme in parallel with the seismic surveys to establish a better interaction with the communities influenced by these operations and reduce possible negative effects. Between January and October 2003, CGG Brazil studied coastal communities in the following areas. BM-CE-1 e BM -CE-2, Ceara; Fragata, BM-ES-5 e BM-ES-6, Espirito Santo; BM BAR-1 e BM BAR-3, Maranhao and BM-C-25 and BM-C-16 off Campos basin. Communities and groups that could potentially be influenced by the surveys were visited to mitigate direct and indirect impacts. Preliminary results show that fisheries were the main group to be monitored. A standard questionnaire was used to characterize the local fisheries and interviews were held with fishermen, boat owners and members of the fishery industries (n=422). In Ceara the fishery is typically handmade and occurs in water depths up to 200 meters. The main boat propulsion is sail and the 'Cacoeira' is the most popular gear used. Off Espirito Santo, small and medium motored boats are usually used and line is the main gear among the fishermen. At Barreirinhas (Maranhao), boats are usually up to 14 meters long, and operate in water depths of up to 120 metres. Again the 'cacoeira' is the proffered gear. We concluded that Programs carried out by CGG reached their purpose. This is confirmed by low incident rate between seismic ships and the fisheries fleet. (author)

  18. Characterization of microstructure and catalytic of cerium oxide obtained by colloidal solution; Caracterizacao da microestrutura e da atividade catalitica de oxido de cerio obtido por solucao coloidal

    Energy Technology Data Exchange (ETDEWEB)

    Senisse, C.A.L.; Bergmann, C.P.; Alves, A.K., E-mail: carolinasenisse@hotmail.com [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alege, RS (Brazil). Lab. de Materiais Ceramicos

    2012-07-01

    This study investigated to obtain particles of cerium oxide, for use as catalysts for the combustion of methane using the technique of through polymeric colloidal solution. Obtaining the colloidal system is based on hydrolysis of salts such as cerium acetylacetonate, cerium nitrate in the presence of additives such as polyvinylbutyral (PVB), polyvinylpyrrolidone (PVP) and polyvinyl acetate (PVA), at concentrations of 5, 10 and 15% in aqueous or alcoholic medium. These solutions containing ions of interest were subjected to a heat treatment at 650° C for 30 minutes, with heating rate of 2 ° C/ min. After heat treatment, the fibers were characterized according to their morphology, surface area, crystallinity, weight loss and catalytic activity. Samples obtained from cerium acetylacetonate were more reactive than the cerium nitrate to the combustion of methane, as showed greater conversions and higher temperatures reached during the process, which is of utmost importance since the combustion catalytic methane is used for generating thermal energy. After the reaction with methane, the samples underwent significant change in surface area, probably due to the intensity of combustion reactions of the nitrate and the generation of heat involved in this reaction, which gave rise to coarse particles. During the combustion process using the obtained from particles of cerium acetylacetonate, there was the release of large quantities of nitrogen compared to the results of assays with the particles obtained with cerium nitrate. (author)

  19. Phenotypic expressions of CCR5-Delta 32/Delta 32 homozygosity

    NARCIS (Netherlands)

    Nguyen, GT; Carrington, M; Beeler, JA; Dean, M; Aledort, LM; Blatt, PM; Cohen, AR; DiMichele, D; Eyster, ME; Kessler, CM; Konkle, B; Leissinger, C; Luban, N; O'Brien, SJ; Goedert, JJ; O'Brien, TR

    1999-01-01

    Objective: As blockade of CC-chemokine receptor 5 (CCR5) has been proposed as therapy for HIV-1, we examined whether the CCR5-Delta 32/Delta 32 homozygous genotype has phenotypic expressions other than those related to HIV-1. Design: Study subjects were white homosexual men or men with hemophilia wh

  20. Peat compaction in deltas : implications for Holocene delta evolution

    NARCIS (Netherlands)

    van Asselen, S.

    2010-01-01

    Many deltas contain substantial amounts of peat, which is the most compressible soil type. Therefore, peat compaction potentially leads to high amounts of subsidence in deltas. The main objective of this research was to quantify subsidence due to peat compaction in Holocene fluvial-deltaic settings

  1. Mida pakub Delta? / Teele Kurm

    Index Scriptorium Estoniae

    Kurm, Teele

    2011-01-01

    Politsei- ja Piirivalveamet võtab kasutusele ühise Siseministeeriumi infotehnoloogia- ja arenduskeskuse ning Webmedia AS koostööna loodud dokumendihaldussüsteemi Delta. Kust sai Delta oma nime? Projekti "Dokumendihaldussüsteemi juurutamine Siseministeeriumi haldusalas" eesmärgid

  2. Delta Electroproduction in 12-C

    Energy Technology Data Exchange (ETDEWEB)

    Steven McLauchlan

    2003-01-31

    The Delta-nucleus potential is a crucial element in the understanding of the nuclear system. Previous electroexcitation measurements in the delta region reported a Q2 dependence of the delta mass indicating that this potential is dependent on the momentum of the delta. Such a dependence is not observed for protons and neutrons in the nuclear medium. This thesis presents the experimental study of the electroexcitation of the delta resonance in 12C, performed using the high energy electron beam at the Thomas Jefferson National Accelerator Facility, and the near 4(pie) acceptance detector CLAS that enables the detection of the full reaction final state. Inclusive, semi inclusive, and exclusive cross sections were measured with an incident electron beam energy of 1.162GeV over the Q2 range 0.175-0.475 (GeV/c)2. A Q2 dependence of the delta mass was only observed in the exclusive measurements indicating that the delta-nucleus potential is affected by the momentum of the delta.

  3. Delta-N Electromagnetic Transition

    OpenAIRE

    Loan, Mushtaq

    1999-01-01

    The EM ratio for a free Delta electromagnetic transition is discussed within the frame work of nonrelativistic approach. Such an approach gives a good account of data for a free Delta but is less important for an intrinsically relativistic nuclear many body problem.

  4. Mackenzie River Delta, Canada

    Science.gov (United States)

    2007-01-01

    The Mackenzie River in the Northwest Territories, Canada, with its headstreams the Peace and Finley, is the longest river in North America at 4241 km, and drains an area of 1,805,000 square km. The large marshy delta provides habitat for migrating Snow Geese, Tundra Swans, Brant, and other waterfowl. The estuary is a calving area for Beluga whales. The Mackenzie (previously the Disappointment River) was named after Alexander Mackenzie who travelled the river while trying to reach the Pacific in 1789. The image was acquired on August 4, 2005, covers an area of 55.8 x 55.8 km, and is located at 68.6 degrees north latitude, 134.7 degrees west longitude. The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

  5. Delta-like 1 participates in the specification of ventral midbrain progenitor derived dopaminergic neurons

    DEFF Research Database (Denmark)

    Bauer, Matthias; Szulc, Jolanta; Meyer, Morten;

    2008-01-01

    Delta-like 1 (Dlk1), a member of the Delta/Notch protein family, is expressed in the mouse ventral midbrain (VM) as early as embryonic day 11.5 (E11.5) followed by exclusive expression in tyrosine 3-monooxygenase (TH) positive neurons from E12.5 onwards. To further elucidate the yet unknown...... vitro. The study presented here is the first publication identifying Dlk1 effects on ventral midbrain-derived DA precursor differentiation....

  6. Distributed (Delta + 1)-coloring in linear (in Delta) time

    OpenAIRE

    Barenboim, Leonid; Elkin, Michael

    2008-01-01

    The distributed (Delta + 1)-coloring problem is one of most fundamental and well-studied problems of Distributed Algorithms. Starting with the work of Cole and Vishkin in 86, there was a long line of gradually improving algorithms published. The current state-of-the-art running time is O(Delta log Delta + log^* n), due to Kuhn and Wattenhofer, PODC'06. Linial (FOCS'87) has proved a lower bound of 1/2 \\log^* n for the problem, and Szegedy and Vishwanathan (STOC'93) provided a heuristic argumen...

  7. Shifted symmetric $\\delta$-vectors of convex polytopes

    OpenAIRE

    Higashitani, Akihiro

    2009-01-01

    A $\\delta$-vector $\\delta(\\Pc)= (\\delta_0, \\delta_1, ..., \\delta_d)$ is called shifted symmetric if $\\delta_{d-i} = \\delta_{i+1}$ for each $0 \\leq i \\leq [(d-1)/2]$. A natural family of $(0,1)$-polytopes with shifted symmetric $\\delta$-vectors will be studied.

  8. Artificial delta growth

    Science.gov (United States)

    Mikeš, Daniel

    2010-05-01

    A deltaic sedimentary system has a point source; sediment is carried over the delta plain by distributary channels away from the point source and deposited at the delta front by distributary mouth bars. The established methods to describe such a sedimentary system are "bedding analysis", "facies analysis", and "basin analysis". We shall call the ambient conditions "input" and the rock record "output". There exist a number of methods to deduce input from output, e.g. "Sequence stratigraphy" (a.o. Vail et al. 1977, Catuneanu et al. 2009), "Shoreline trajectory" (a.o. Helland-Hansen & Martinsen 1996, Helland-Hansen & Hampson 2009) on the one hand and the complex use of established techniques on the other (a.o. Miall & Miall 2001, Miall & Miall 2002). None of these deductive methods seems to be sufficient. I claim that the common errors in all these attempts are the following: (1) a sedimentary system is four-dimensional (3+1) and a lesser dimensional analysis is insufficient; (2) a sedimentary system is complex and any empirical/deductive analysis is non-unique. The proper approach to the problem is therefore the theoretical/inductive analysis. To that end we performed six scenarios of a scaled version of a passive margin delta in a flume tank. The scenarios have identical stepwise tectonic subsidence and semi-cyclic sealevel, but different supply curves, i.e. supply is: constant, highly-frequent, proportional to sealevel, inversely proportional to sealevel, lagging to sealevel, ahead of sealevel. The preliminary results are indicative. Lobe-switching occurs frequently and hence locally sedimentation occurs shortly and hiatuses are substantial; therefore events in 2D (+1) cross-sections don't correlate temporally. The number of sedimentary cycles disequals the number of sealevel cycles. Lobe-switching and stepwise tectonic subsidence cause onlap/transgression. Erosional unconformities are local diachronous events, whereas maximum flooding surfaces are regional

  9. WORLD DELTAS AND THEIR EVOLUTION

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    In August 1998, an international symposium on the world deltas was held in New Orleans, Louisiana, USA. This symposium attracted discussion about more than 25 deltas from around the world with emphasis placed on those that are most densely populated and impacted by humans. Keynote papers printed details about the physical, biological, engineering and socioeconomic aspects of six deltas including the Mississippi, Nile, Ganges-Brahmaputra, Rhine-Meuse, Changjiang and Po. The main purpose of this symposium was to inform scientists, engineers and decision-makers about information that is currently available and to provide them a basis for working in such environments.

  10. Dynamical Casimir effect with $\\delta-\\delta^{\\prime}$ mirrors

    CERN Document Server

    Silva, Jeferson Danilo L; Alves, Danilo T

    2016-01-01

    We calculate the spectrum and the total rate of created particles for a real massless scalar field in $1+1$ dimensions, in the presence of a partially transparent moving mirror simulated by a Dirac $\\delta-\\delta^{\\prime}$ point interaction. We show that, strikingly, a partially reflecting mirror can produce a larger number of particles in comparison with a perfectly reflecting one. In the limit of a perfect mirror, our formulas recover those found in the literature for the Robin boundary condition.

  11. Dynamical Casimir effect with $\\delta-\\delta^{\\prime}$ mirrors

    OpenAIRE

    Silva, Jeferson Danilo L.; Braga, Alessandra N.; Alves, Danilo T.

    2016-01-01

    We calculate the spectrum and the total rate of created particles for a real massless scalar field in $1+1$ dimensions, in the presence of a partially transparent moving mirror simulated by a Dirac $\\delta-\\delta^{\\prime}$ point interaction. We show that, strikingly, a partially reflecting mirror can produce a larger number of particles in comparison with a perfectly reflecting one. In the limit of a perfect mirror, our formulas recover those found in the literature for the Robin boundary con...

  12. Realization of high-end Delta-Sigma DAC in FPGA

    OpenAIRE

    Olsen, Lasse Haugnes

    2006-01-01

    Oppgaven har gått ut på å lage en high-end delta-sigma DA-konverter for FPGA. Prinsippet for en slik DA-konverter er at det analoge utgangssignalet genereres ved å lavpassfiltrere et 1-bit digitalt utgangssignal fra FPGA-kretsen. For å oppnå ønsket signalkvalitet ved den 1-bit representasjonen, krever dette at det benyttes oversampling og støyforming ved hjelp av en delta-sigma-modulator. I det 1-bit utgangssignalet er benyttet pulsbredde-modulasjon (PWM), som er gunstig med tanke på de ik...

  13. Realisering av high-end delta-sigma DAC i FPGA

    OpenAIRE

    Olsen, Lasse Haugnes

    2006-01-01

    Oppgaven har gått ut på å lage en high-end delta-sigma DA-konverter for FPGA. Prinsippet for en slik DA-konverter er at det analoge utgangssignalet genereres ved å lavpassfiltrere et 1-bit digitalt utgangssignal fra FPGA-kretsen. For å oppnå ønsket signalkvalitet ved den 1-bit representasjonen, krever dette at det benyttes oversampling og støyforming ved hjelp av en delta-sigma-modulator. I det 1-bit utgangssignalet er benyttet pulsbredde-modulasjon (PWM), som er gunstig med tanke på de ik...

  14. Supersymmetric \\Delta A_{CP}

    OpenAIRE

    Hiller, Gudrun; Hochberg, Yonit; Nir, Yosef

    2012-01-01

    There is experimental evidence for a direct CP asymmetry in singly Cabibbo suppressed D decays, \\Delta A_{CP} \\sim 0.006. Naive expectations are that the Standard Model contribution to \\Delta A_{CP} is an order of magnitude smaller. We explore the possibility that a major part of the symmetry comes from supersymmetric contributions. The leading candidates are models where the flavor structure of the trilinear scalar couplings is related to the structure of the Yukawa couplings via approximate...

  15. Wideband Sigma-Delta Modulators

    OpenAIRE

    Yuan, Xiaolong

    2010-01-01

    Sigma-delta modulators (SDM) have come up as an attractive candidatefor analog-to-digital conversion in single chip front ends thanks to the continuousimproving performance. The major disadvantage is the limited bandwidthdue to the need of oversampling. Therefore, extending these convertersto broadband applications requires lowering the oversampling ratio (OSR) inorder. The aim of this thesis is the investigation on the topology and structureof sigma-delta modulators suitable for wideband app...

  16. Delta's zoeken steun bij elkaar

    OpenAIRE

    Driel, van, L.

    2012-01-01

    Wereldwijd staan delta’s onder druk door bevolkingsgroei, industrialisatie en klimaatverandering. In de Delta Alliance zijn nu tien delta’s uit Noord- en Zuid-Amerika, Afrika, Azië en Nederland verenigd, en een tiental andere Afrikaanse en Aziatische delta’s zoeken nog aansluiting. ‘Men wil weten hoe andere delta’s met problemen omgaan’, verklaart programmamanager Wim van Driel de belangstelling. In juni 2011 is de stichting Delta Alliance International opgericht om het geheel meer slagkracht...

  17. $\\delta$-Expansion at Finite Temperature

    OpenAIRE

    Ramos, Rudnei O.

    1996-01-01

    We apply the $\\delta$-expansion perturbation scheme to the $\\lambda \\phi^{4}$ self-interacting scalar field theory in 3+1 D at finite temperature. In the $\\delta$-expansion the interaction term is written as $\\lambda (\\phi^{2})^{ 1 + \\delta}$ and $\\delta$ is considered as the perturbation parameter. We compute within this perturbative approach the renormalized mass at finite temperature at a finite order in $\\delta$. The results are compared with the usual loop-expansion at finite temperature.

  18. On supersymmetric Dirac delta interactions

    CERN Document Server

    Guilarte, J Mateos; Castaneda, J M Munoz

    2014-01-01

    In this paper we construct $\\mathcal{N}=2$ supersymmetric quantum mechanics over several configurations of Dirac delta potentials from one single delta to a Dirac "comb". We show in detail how the building of supersymmetry on potentials with delta interactions placed in two or more points on the real line requires the inclusion of quasi-square wells. We find an scenario of either unbroken supersymmetry with Witten index one or supersymmetry breaking when there is one "bosonic" and one "fermionic" ground state such that the Witten index is zero. We explain next the different structure of the scattering waves produced by three $\\delta/\\theta$ potentials with respect to the the eigenfunctions arising in the non-SUSY case. In particular, much more bound states paired by supersymmetry exist within the supersymmetric framework as compared with the non-SUSY problem. An infinite array of equally spaced $\\delta$-interactions of the same strength but alternatively attractive and repulsive are susceptible of being promo...

  19. Scalar mesons and delta0-delta2 at KLOE

    OpenAIRE

    The KLOE Collaboration

    2003-01-01

    The KLOE measurement of phi radiative decays and of the ratio Gamma(Ks->pi+pi-(gamma))/Gamma(Ks->pi0pi0) are discussed. The first measurement aims at understanding the real nature of the scalar mesons a0 and f0, whose possible compositions are qq, qqqq, or KK molecule. The second measurement is related to the estimate of the phase shift difference delta0-delta2. Previous measurements were affected by a large uncertainty due to the presence of radiative effects which are correctly included in ...

  20. Student Difficulties with the Dirac Delta Function

    CERN Document Server

    Wilcox, Bethany R

    2014-01-01

    The Dirac delta function is a standard mathematical tool used in multiple topical areas in the undergraduate physics curriculum. While Dirac delta functions are usually introduced in order to simplify a problem mathematically, students often struggle to manipulate and interpret them. To better understand student difficulties with the delta function at the upper-division level, we examined responses to traditional exam questions and conducted think-aloud interviews. Our analysis was guided by an analytical framework that focuses on how students activate, construct, execute, and reflect on the Dirac delta function in physics. Here, we focus on student difficulties using the delta function to express charge distributions in the context of junior-level electrostatics. Challenges included: invoking the delta function spontaneously, constructing two- and three-dimensional delta functions, integrating novel delta function expressions, and recognizing that the delta function can have units.

  1. Graphs with $\\chi=\\Delta$ have big cliques

    OpenAIRE

    Cranston, Daniel W.; Rabern, Landon

    2013-01-01

    Brooks' Theorem states that if a graph has $\\Delta\\ge 3$ and $\\omega \\le \\Delta$, then $\\chi \\le \\Delta$. Borodin and Kostochka conjectured that if $\\Delta\\ge 9$ and $\\omega\\le \\Delta-1$, then $\\chi\\le \\Delta-1$. We show that if $\\Delta\\ge 13$ and $\\omega \\le \\Delta-4$, then $\\chi\\le \\Delta-1$. For a graph $G$, let $\\mathcal{H}$ denote the subgraph of $G$ induced by vertices of degree $\\Delta$. We also show that if $\\omega\\le \\Delta-1$ and $\\omega(\\mathcal{H})\\le \\Delta-6$, then $\\chi\\le \\Del...

  2. Hepatitis Delta Virus RNA Replication

    Directory of Open Access Journals (Sweden)

    Chung-Hsin Tseng

    2009-11-01

    Full Text Available Hepatitis delta virus (HDV is a distant relative of plant viroids in the animal world. Similar to plant viroids, HDV replicates its circular RNA genome using a double rolling-circle mechanism. Nevertheless, the production of hepatitis delta antigen (HDAg, which is indispensible for HDV replication, is a unique feature distinct from plant viroids, which do not encode any protein. Here the HDV RNA replication cycle is reviewed, with emphasis on the function of HDAg in modulating RNA replication and the nature of the enzyme involved.

  3. Delta Vegetation and Land Use [ds292

    Data.gov (United States)

    California Department of Resources — Vegetation and land use are mapped for the approximately 725,000 acres constituting the Legal Delta portion of the Sacramento and San Joaquin River Delta area....

  4. Yellow River Delta Faces a Historic Opportunity

    Institute of Scientific and Technical Information of China (English)

    Li Zhen

    2011-01-01

    @@ China's State Council has endorsed the Development Plan of an Efficient Eco-Economic Zone at Yellow River Delta.The plan is meant to create a more ecologically sustainable economic zone along the river delta.

  5. On the modelling of river delta formation

    NARCIS (Netherlands)

    Geleynse, N.

    2013-01-01

    This thesis presents approaches to the modelling of river delta formation. In particular, it provides results of numerical stratigraphic-morphodynamic modelling of river delta formation under various environmental forcings.

  6. Spongeplant Spreading in the Delta

    Science.gov (United States)

    Invasive, exotic aquatic plants impact a range of important economic and ecological functions in the Sacramento-San Joaquin Delta of California, and the state now spends over $5 million to control water hyacinth and Brazilian waterweed. In 2007, a new exotic floating plant South American Spongeplan...

  7. Revisiting double Dirac delta potential

    Science.gov (United States)

    Ahmed, Zafar; Kumar, Sachin; Sharma, Mayank; Sharma, Vibhu

    2016-07-01

    We study a general double Dirac delta potential to show that this is the simplest yet still versatile solvable potential to introduce double wells, avoided crossings, resonances and perfect transmission (T = 1). Perfect transmission energies turn out to be the critical property of symmetric and anti-symmetric cases wherein these discrete energies are found to correspond to the eigenvalues of a Dirac delta potential placed symmetrically between two rigid walls. For well(s) or barrier(s), perfect transmission (or zero reflectivity, R(E)) at energy E=0 is non-intuitive. However, this has been found earlier and called the ‘threshold anomaly’. Here we show that it is a critical phenomenon and we can have 0≤slant R(0)\\lt 1 when the parameters of the double delta potential satisfy an interesting condition. We also invoke a zero-energy and zero curvature eigenstate (\\psi (x)={Ax}+B) of the delta well between two symmetric rigid walls for R(0)=0. We resolve that the resonant energies and the perfect transmission energies are different and they arise differently.

  8. Maintenance of large deltas through channelization

    Science.gov (United States)

    Giosan, L.; Constatinescu, S.; Filip, F.

    2013-12-01

    A new paradigm for delta restoration is currently taking shape using primarily Mississippi delta examples. Here we propose an alternative for delta maintenance primarily envisioned for wave-influenced deltas based on Danube delta experiences. Over the last half century, while the total sediment load of the Danube dramatically decreased due to dam construction on tributaries and its mainstem, a grand experiment was inadvertently run in the Danube delta: the construction of a dense network of canals, which almost tripled the water discharge toward the interior of the delta plain. We use core-based and chart-based sedimentation rates and patterns to explore the delta transition from the natural to an anthropogenic regime, to understand the effects of far-field damming and near-field channelization, and to construct a conceptual model for delta development as a function sediment partition between the delta plain and the delta coastal fringe. We show that sediment fluxes increased to the delta plain due to channelization, counteracting sea level rise. In turn, the delta coastal fringe was most impacted by the Danube's sediment load collapse. Furthermore, we show that morphodynamic feedbacks at the river mouth are crucial in trapping sediment near the coast and constructing wave-dominated deltas or lobes or delaying their destruction. As a general conclusion, we suggest that increased channelization that mimics and enhances natural processes may provide a simple solution for keeping delta plains above sea level and that abandonment of wave-dominated lobes may be the most long term efficient solution for protecting the internal fluvial regions of deltas and provide new coastal growth downcoast.

  9. Delta-groupoids in knot theory

    OpenAIRE

    Kashaev, Rinat Mavlyavievich

    2009-01-01

    A Delta-groupoid is an algebraic structure which axiomitizes the combinatorics of a truncated tetrahedron. It is shown that there are relations of Delta-groupoids to rings, group pairs, and (ideal) triangulations of three-manifolds. In particular, one can associate a Delta-groupoid to ideal triangulations of knot complements. It is also possible to define a homology theory of Delta-groupoids. The constructions are illustrated by examples coming from knot theory.

  10. On $\\delta$-homogeneous Riemannian manifolds

    OpenAIRE

    Berestovskii, V. N.; Nikonorov, Yu. G.

    2006-01-01

    We study in this paper previously defined by V.N. Berestovskii and C.P. Plaut $\\delta$-homogeneous spaces in the case of Riemannian manifolds. Every such manifold has non-negative sectional curvature. The universal covering of any $\\delta$-homogeneous Riemannian manifolds is itself $\\delta$-homogeneous. In turn, every simply connected Riemannian $\\delta$-homogeneous manifold is a direct metric product of an Euclidean space and compact simply connected indecomposable homogeneous manifolds; all...

  11. Assessment of Delta Nitrogen Losses (Delta NL) at the Field Level

    Science.gov (United States)

    We defined a new concept of field-level delta nitrogen (N) losses (Delta NL) as a comparison between management scenarios. We defined delta nitrogen losses (Delta NL) as a function of improved N use efficiencies of field management scenarios that reduce the average N inputs and/or modify other manag...

  12. Reflections on Development Strategy of Pearl River Delta: In Comparison with Yangtze River Delta

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    <正>1. A comparison between Pearl River Delta and Yangtze River Delta 1.1 Basic conditions 1.1.1 Location, area and scope Located in the southeast of Guangdong Province, the Pearl River Delta (PRD) as an economic zone is a compound delta

  13. Variation in leaf water delta D and delta 18O values during the evapotranspiration process

    International Nuclear Information System (INIS)

    A theoretical model was developed to evaluate leaf water delta D and delta 18O variation in relation to: leaf temperature, relative humidity converted to leaf temperature and delta D and delta 18O values of atmospheric water vapour and soil water. (M.A.C.)

  14. 27 CFR 9.96 - Mississippi Delta.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Mississippi Delta. 9.96... Mississippi Delta. (a) Name. The name of the viticultural area described in this section is “Mississippi Delta.” (b) Approved maps. The appropriate maps for determining the boundaries of the Mississippi...

  15. Delta-groupoids and ideal triangulations

    OpenAIRE

    Kashaev, Rinat Mavlyavievich

    2009-01-01

    A Delta-groupoid is an algebraic structure which axiomatizes the combinatorics of a truncated tetrahedron. By considering two simplest examples coming from knot theory, we illustrate how can one associate a Delta-groupoid to an ideal triangulation of a three-manifold. We also describe in detail the rings associated with the Delta-groupoids of these examples.

  16. New guidelines for delta C-13 measurements

    NARCIS (Netherlands)

    Coplen, TB; Brand, WA; Gehre, M; Groning, M; Meijer, HAJ; Toman, B; Verkouteren, RM; Coplen, Tyler B.; Brand, Willi A.; Gröning, Manfred

    2006-01-01

    Consistency of delta C-13 measurements can be improved 39-47% by anchoring the delta C-13 scale with two isotopic reference materials differing substantially in C-13/C-12. It is recommended that delta C-13 values of both organic and inorganic materials be measured and expressed relative to VPDB (Vie

  17. T cell receptor gamma/delta chain diversity

    OpenAIRE

    1988-01-01

    The TCR-gamma and -delta chains of six murine hybridomas were compared by one-dimensional SDS-PAGE and two-dimensional NEPHGE/SDS-PAGE analysis. This allowed the identification of three distinct gamma chains (gamma a, gamma b, and gamma c) and three distinct delta chains (delta a, delta b, and delta c). Four gamma/delta chain combinations (gamma a delta a, gamma b delta b, gamma b delta c, and gamma c delta a) were observed. These results indicate that multiple forms of the delta chain are ex...

  18. What is $\\Delta m^2_{ee}$ ?

    CERN Document Server

    Parke, Stephen

    2016-01-01

    The current short baseline reactor experiments, Daya Bay and RENO (Double Chooz) have measured (or are capable of measuring) an effective $\\Delta m^2$ associated with the atmospheric oscillation scale of 0.5 km/MeV in electron anti-neutrino disappearance. In this paper, I compare and contrast the different definitions of such an effective $\\Delta m^2$ and argue that the simple, L/E independent, definition given by $\\Delta m^2_{ee} \\equiv \\cos^2 \\theta_{12} \\Delta m^2_{31}+ \\sin^2 \\theta_{12} \\Delta m^2_{32}$, i.e. "the $\

  19. New perspectives for urbanizing deltas

    OpenAIRE

    Meyer, Han; Bregt, A.K.; Dammers, Ed; Edelbos, Jurian; Berg, van den, T.J.T.P.; Born, van den, J.; Broesi, R.; Buuren, van, A.; Burg, van den, S.W.K.; Duijn, Mike; Heun, Gepke; M. Marchand; Neumann, D.; Nieuwenhuijze, L.; Nijhuis, S.

    2015-01-01

    The delta region between Rotterdam and Antwerp is a prime example of an area where spatial developments face increasing complexity. Local initiatives for developing urban expansions, recreation areas, nature and industrial complexes must harmonize with measures such as adequate flood protection, sufficient freshwater supply, restoration of ecosystems and large-scale infrastructure over the long term. This complexity demans a new approach to spatial planning and design. This book is the result...

  20. Characterization, analysis and dating of archaeological ceramics from the Amazon basin through nuclear techniques; Caracterizacao, analise e datacao de ceramicas arqueologicas da Bacia Amazonica atraves de tecnicas nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Latini, Rose Mary

    1998-07-01

    The aim of this work is to contribute to the research in the reconstruction of part of the pre-history of the Amazon Basin by means of an analytical methods combined with multivariate analysis, given a analytic basis that can be continued by the archaeological work, through the identification, classification, provenance and dating the ceramics found in different archaeological sites of the Hydro graphic Basin of the Purus river. Neutron activation analysis in conjunction multivariate statistical methods were used for the identification and classification and thermoluminescence was used for the dating. Chemical composition results were in better agreement with archaeological classification for the archaeologically define Iquiri, Quinan and Xapuri phases and less characteristics the Iaco and Jacuru archaeological phase were not well characterized. An homogeneous group was established by most of the samples collected from the Los Angeles Archaeological Site (LA) and was distinct from all the other groups analysed. The provenance studies made with ceramics collected at this site shows that they were made with clay from nearby river (Rio Ina). From the LA ceramics dating the average date of site occupation was 1660 years. The ceramic dating results from the external wall of a circular earth wall construction confirm the relation with the local pre-history. Beyond the Acre material two urns were dated from the Archaeological Site Morro Grande and Sao Jose at Araruama, Rio de Janeiro. (author)

  1. Structural analysis and magmatism characterization of the Major Gercino shear zone, Santa Catarina State, Brazil; Analise estrutural e caracterizacao do magmatismo da zona de cisalhamento Major Gercino, SC

    Energy Technology Data Exchange (ETDEWEB)

    Passarelli, Claudia Regina

    1996-12-31

    This work describes the geometric and kinematic characteristics of the Major Gercino Shear Zone (MGSZ) in the Canelinha-Garcia area. This shear zone is one of the major lineaments that affect all southern Brazilian precambrian terrains. In Santa Catarina State, it separates, along its whole extension, the supracrustal rocks of the Brusque belt (northern part) from the Granitoid belt (southern). This zone is characterized by a regional NE trend and a dextral sense of movement where ductile-brittle structures predominate. The MGSZ is composed of two mylonitic belts separated by granitoid rocks probably associated to the development of the shear zone. Both shear zones show cataclastic to ultra mylonitic rocks, but mylonites and protomylonites conditions at high strain rate. The calc-alkaline granitoids present in the area can be grouped in two granitoid associations with meta to peraluminous affinities. The Rolador Granitoid Association is characterized by grayish porphyritic biotite-monzogranites and the Fernandes Granitoid Association by coarsed-grained to porphyritic pinkish amphibole-syenogranites. The U-Pb and Rb-Sr ages range from 670 to 590 Ma with the Sr{sup 87} / Sr{sup 86} initial ratios suggesting a crustal contribution in the generation of these rocks. The importance of the pure shear component is also emphasized by the results of the Fry method. Many z axes of the strain ellipses are at high angle to the shear foliation. Symmetric porphyroclasts also corroborate this hypothesis. The micaceous minerals formed during the shear development indicate K-Ar ages around 555 {+-} 15 Ma. Brittle reactivations of the shear zone have been placed by K-Ar in fine-fraction materials at Triassic time (215 {+-} 15 Ma.) 220 refs., 107 figs., 18 tabs., 4 maps

  2. Synthesis and characterization of cellulose derivatives obtained from bacterial cellulose; Sintese e caracterizacao de derivados celulosicos obtidos a partir da celulose bacteriana

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Rafael L. de; Barud, Hernane; Ribeiro, Sidney J.L.; Messaddeq, Younes, E-mail: rafael.tu@gmail.com [Instituto de Quimica - Universidade Estadual Paulista Julio de Mesquita Filho - UNESP, Araraquara, SP (Brazil)

    2011-07-01

    The chemical modification of cellulose leads to production of derivatives with different properties from those observed for the original cellulose, for example, increased solubility in more traditional solvents. In this work we synthesized four derivatives of cellulose: microcrystalline cellulose, cellulose acetate, methylcellulose and carboxymethylcellulose using bacterial cellulose as a source. These were characterized in terms of chemical and structural changes by examining the degree of substitution (DS), infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy - NMR {sup 13}C. The molecular weight and degree of polymerization were evaluated by viscometry. The characterization of the morphology of materials and thermal properties were performed with the techniques of X-ray diffraction, electron microscopy images, differential scanning calorimetry (DSC) and thermogravimetric analysis. (author)

  3. Characterization and evaluation of residue 'grits' of the cellulose industry; Caracterizacao e avaliacao do resisduo 'grits' da industria de celulose

    Energy Technology Data Exchange (ETDEWEB)

    Destefani, A.Z.; Santos, M.M.; Holanda, J.N.F. [Universidade Estadual do Norte Fluminense Darcy Ribeiro (LAMAV/CCT/UENF), Campos dos Goytacazes, RJ (Brazil). Lab. de Materiais Avancados

    2010-07-01

    The cellulose industry generates huge amounts of solid waste residue called 'grits'. These wastes have been willing over time in landfills near the mills. However, this type of disposal is not environmentally friendly and can cause degradation and environmental pollution. In addition, environmental legislation increasingly severe and the high costs of landfill have led the search for new alternatives for final disposition of this abundant waste. In this context, this study is to characterize waste grits, generated by the cellulose industry in the region of Aracruz-ES. The residue samples were characterized in terms of chemical composition, X-ray diffraction, particle size distribution and thermal analysis (DTA and TGA). The characterization of the residual 'grits' demonstrated its potential as a feedstock for production of soil-cement bricks. (author)

  4. Methodology for the analysis and characterization of the demand side energy resources; Metodologia para analise e caracterizacao dos recursos energeticos do lado da demanda

    Energy Technology Data Exchange (ETDEWEB)

    Baitelo, Ricardo Lacerda; Udaeta, Miguel Edgar Morales [Universidade de Sao Paulo (USP), SP (Brazil). Dept. de Energia e Automacao Eletricas. Grupo de Energia; Burani, Geraldo Francisco; Grimoni, Jose Aquiles Baesso [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Energia e Eletrotecnica

    2006-07-01

    This abstract aims at describing briefly a model for the assessment of demand side energy resources This model intends to comprehend every kind of action and measure related to demand side management and energy conservation, evaluating them in a holistic way, into four dimensions: technical-economical, environmental, social and political. Different aspects regarding the resources are also accounted, such as energetic potentials (theoretical, accomplishable and economic). At last, scenarios concerning the introduction of evaluated resources through a period of time are elaborated. (author)

  5. Treatment and characterization of fiber licuri for synthesis of polymeric composites; Tratamento e caracterizacao da fibra de licuri para sintese de compositos polimericos

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, J.C.; Miranda, C.S.; Carvalho, R.F.; Jose, N.M.; Boaventura, J.S., E-mail: jamersonoliveira1@hotmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais

    2010-07-01

    Natural fibers are materials of increasing use of polymeric composites, due to several advantageous properties compared to synthetic fibers: low cost, density, toxicity and excellent biodegradability. Licuri fiber is widely used in the manufacture of handicrafts, with a wide range of possible applications. Before this, characterize the properties of the fiber is of great interest economic, technological and social. This study characterized the fibers in nature, which were washed with water, treated with 5% H{sub 2}SO{sub 4} or 5% NaOH. Techniques were used FTIR, DSC, TGA and XRD, as well as analysis of surface reactivity of the acid and base. All treatments altered the surface of licuri, exposing reactive sites. It was observed that sodium hydroxide licuri changed significantly, as expected. These results are very significant for the recovery of a natural fiber (licuri), abundant in poor regions of the country. (author)

  6. Characterization of steel grit recovered from ornamental rocks waste by magnetic separation; Caracterizacao da granalha de aco recuperada do residuo de rochas ornamentais por separacao magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Junca, E.; Telles, V.B.; Rodrigues, G.F.; Oliveira, J.R. de; Tenorio, J.A.S., E-mail: eduardojunca@gmail.co [Universidade de Sao Paulo (USP), SP (Brazil). Dept. de Engenharia Metalurgica e de Materiais; Instituto Federal de Ciencia e Tecnologia do Espirito Santo (IFES), Vitoria, ES (Brazil)

    2010-07-01

    The aim of this work is characterization of steel grit recovered from ornamental rock waste by magnetic separation. The magnetic separation was realized in three steps: first, using a high intensity wet magnetic separator, which used only the remaining magnetic field of equipment. In the second step, the magnetic material obtained in the first phase was subjected to a new manual magnetic separation using rare earth magnets. In a third step, magnetic material obtained with rare earth magnets was subjected to manual magnetic separation using ferrite magnets. After the magnetic separation, the material was sent to characterization which was obtained by chemical analysis, scanning electron microscopy, X-ray diffraction and size analysis. The size analysis showed that the concentrate range from 0,5 to 563,67 {mu}m with 4 wt.% over 100 {mu}m and content metallic iron of 93 wt%. (author)

  7. Characterization of the Ni-45wt% Ti shape memory alloy rapidly solidified; Caracterizacao da liga Ni-45wt%Ti com efeito de memoria de forma solidificadas rapidamente

    Energy Technology Data Exchange (ETDEWEB)

    Anselmo, G.C.S.; Castro, W.B. de; Araujo, C.J. de, E-mail: walman@dem.ufcg.edu.b [Universidade Federal de Campina Grande (UAEM/UFCG), PB (Brazil). Unidade Academica de Engenharia Mecanica

    2010-07-01

    One important challenge of microsystems design is the implementation of miniaturized actuation principles efficient at the micro-scale. Shape memory alloys (SMAs) have early on been considered as a potential solution to this problem as these materials offer attractive properties like a high-power to weight ratio, large deformation and the capability to be processed at the micro-scale. shape memory characteristics of Ni-45wt%Ti alloy ribbons prepared by melt spinning were investigated by means of differential scanning calorimetry and X-ray. In these experiments particular attention has been paid to change the velocity of cooling wheel from 30 to 50 m/s. Then the cooling rates of ribbons were controlled. The effect of this cooling rate on martensitic transformation behaviors and structure are discussed. (author)

  8. Biochemical and pharmacological characterization of irradiated crotamine by gamma rays of {sup 60}Co; Caracterizacao bioquimica e farmacologica da crotamina irradiada por raios gama de {sup 60}Co

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Karina Corleto

    2014-07-01

    The serum production in Brazil, the only effective treatment in cases of snakebites, uses horses that although large size, have reduced l lifespan compared with horses not immunized. Ionizing radiation has been shown as an excellent tool in reducing the toxicity of venoms and toxins isolated, and promote the achievement of better immunogens for serum production, and contributing to the welfare of serum-producing animals. It is known, however, that the effects of ionizing radiation on protein are characterized by various chemical modifications, such as fragmentation, cross-linking due to aggregation and oxidation products generated by water radiolysis. However, the action of gamma radiation on toxins is not yet fully understood structurally and pharmacologically, a fact that prevents the application of this methodology in the serum production process. So we proposed in this paper the characterization of crotamine, an important protein from the venom of Crotalus durissus terrificus species, irradiated with {sup 60}Co gamma rays. After isolating the toxin by chromatographic techniques and testing to prove the obtaining of pure crotamine, it was irradiated with gamma rays and subjected to structural analysis, Fluorescence and Circular Dichroism. Using high hydrostatic pressure tests were also conducted in order to verify that the conformational changes caused by radiation suffer modifications under high pressures. From the pharmacological point of view, muscle contraction tests were conducted with the objective of limiting the action of crotamine in smooth muscle as well as the change in the action of toxin caused structural changes to the front. Analysis of Circular Dichroism and Fluorescence showed changes in structural conformation of crotamine when subjected to gamma radiation and that such changes possibly occurring in the secondary and tertiary structure of the protein. The observed in pharmacological tests showed that the irradiated crotamine was less effective in lowering the vas deferens twitch in rats in comparison to native crotamine. In addition, the behavior of irradiated toxin in tonic contraction, modulated by noradrenaline, was different from that observed for the native toxin. (author)

  9. Kinetic characterization and of recrystallization of the aluminum alloy 6063 after S work hardening treatment; Caracterizacao e cinetica de recristalizacao da liga de aluminio 6063 apos tratamentos termomecanicos

    Energy Technology Data Exchange (ETDEWEB)

    Esposito, Iara Maria

    2006-07-01

    The aluminum 6063 alloy possesses a great industrial interest, presenting characteristics that justify its frequent use, when compared to the other aluminum alloys: the precipitation hardening and high cold work capacity. These alloys present high ductility, that allows their use in operations with high deformation degrees, as the cold work. The objective of this work is to show comparative analysis of the hardness Vickers of the commercial aluminum 6063 alloy, after cold work with different area reduction degree and thermal treatment. Considering the frequent utilization aluminium 6063 alloy, this work studies the characterization and recrystallization of this alloy, after the plastic deformation in different area reduction degrees, thermal treatment and convenient treatment times - Thermo mechanic Treatments. (author)

  10. Modification and characterization of the AISI 410 martensitic stainless steels surface; Modificacao e caracterizacao da superficie do aco inoxidavel martensitico AISI 410

    Energy Technology Data Exchange (ETDEWEB)

    Bincoleto, A.V.L. [Universidade Federal de Sao Carlos (PPG-CEM/UFSCar), SP (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais; Nascente, P.A.P. [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    Steam turbines are used in the generation of more than half the electric energy produced in the world nowadays. It is important the study which aims to improve the efficiency by means of the optimization of leaks and of the aerodynamic profiles, as well as to maintain the integrity of the components. The martensitic stainless steels are widely employed due to the combination of their good mechanical properties with higher corrosion resistance. However, their lower wear resistance and their poor tribological behavior limit their use, since they decrease the component life time. In order to evaluate the improvement in the performance of the AISI 410 stainless steel, several process of surface modification were employed. Five samples were produced: the first one was not treated, the second one received liquid nitriding, the third, gas nitriding, the forth, thermal aspersion of tungsten carbide, and the fifth, boronizing. The samples were characterized by optical microscopy, surface microhardness, and X-ray diffractometry. (author)

  11. Preparation and characterization of bentonite clays mixture destined to the removal of heavy metals; Preparacao e caracterizacao da mistura de argilas bentoniticas destinadas a remocao de metais pesados

    Energy Technology Data Exchange (ETDEWEB)

    Almeida Neto, A.F. de; Silva, M.G.C. da, E-mail: ambrosio@feq.unicamp.b [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Fac. de Engenharia Quimica. Dept. de Termofluidodinamica

    2009-07-01

    In this work a mixture was prepared with 50% wt. of the Bofe and Verde-lodo clays. The characterization methods used they were: thermal analyses (TG and DTG), X-ray diffraction, fisissorption of N{sub 2}, scanning electron microscopy and X-ray energy dispersive spectroscopy. The rehearsals of adsorption we accomplished in system of finite bath using as adsorbent the mixture loamy in natura or it mixes calcined. Starting from TG and DTG a thermal treatment was accomplished to 500 deg C of the loamy mixture. Through the results of the copper adsorption, it was verified that mixes loamy it provokes chemical precipitation of the copper while the calcined sample presents amount metal adsorbed around 7.31 mg of copper/g of adsorbent. The value of removal percentage obtained by the calcined sample it was of 63.02%. (author)

  12. Deformation characteristics of {delta} phase in the delta-processed Inconel 718 alloy

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, H.Y., E-mail: haiyanzhang@imr.ac.cn [Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China); Zhang, S.H., E-mail: shzhang@imr.ac.cn [Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China); Cheng, M. [Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China); Li, Z.X. [Beijing Institute of Aeronautica1 Materials, Beijing 100095 (China)

    2010-01-15

    The hot working characteristics of {delta} phase in the delta-processed Inconel 718 alloy during isothermal compression deformation at temperature of 950 deg. C and strain rate of 0.005 s{sup -1}, were studied by using optical microscope, scanning electron microscope and quantitative X-ray diffraction technique. The results showed that the dissolution of plate-like {delta} phase and the precipitation of spherical {delta} phase particles coexisted during the deformation, and the content of {delta} phase decreased from 7.05 wt.% to 5.14 wt.%. As a result of deformation breakage and dissolution breakage, the plate-like {delta} phase was spheroidized and transferred to spherical {delta} phase particles. In the center with largest strain, the plate-like {delta} phase disappeared and spherical {delta} phase appeared in the interior of grains and grain boundaries.

  13. Cell-autonomous alteration of dopaminergic transmission by wild type and mutant (DeltaE) TorsinA in transgenic mice.

    Science.gov (United States)

    Page, Michelle E; Bao, Li; Andre, Pierrette; Pelta-Heller, Joshua; Sluzas, Emily; Gonzalez-Alegre, Pedro; Bogush, Alexey; Khan, Loren E; Iacovitti, Lorraine; Rice, Margaret E; Ehrlich, Michelle E

    2010-09-01

    Early onset torsion dystonia is an autosomal dominant movement disorder of variable penetrance caused by a glutamic acid, i.e. DeltaE, deletion in DYT1, encoding the protein TorsinA. Genetic and structural data implicate basal ganglia dysfunction in dystonia. TorsinA, however, is diffusely expressed, and therefore the primary source of dysfunction may be obscured in pan-neuronal transgenic mouse models. We utilized the tyrosine hydroxylase (TH) promoter to direct transgene expression specifically to dopaminergic neurons of the midbrain to identify cell-autonomous abnormalities. Expression of both the human wild type (hTorsinA) and mutant (DeltaE-hTorsinA) protein resulted in alterations of dopamine release as detected by microdialysis and fast cycle voltammetry. Motor abnormalities detected in these mice mimicked those noted in transgenic mice with pan-neuronal transgene expression. The locomotor response to cocaine in both TH-hTorsinA and TH-DeltaE-hTorsinA, in the face of abnormal extracellular DA levels relative to non-transgenic mice, suggests compensatory, post-synaptic alterations in striatal DA transmission. This is the first cell-subtype-specific DYT1 transgenic mouse that can serve to differentiate between primary and secondary changes in dystonia, thereby helping to target disease therapies. PMID:20460154

  14. Future Deltas Utrecht University research focus area: towards sustainable management of sinking deltas

    Science.gov (United States)

    Stouthamer, E.; van Asselen, S.

    2015-11-01

    Deltas are increasingly under pressure from human impact and climate change. To deal with these pressures that threat future delta functioning, we need to understand interactions between physical, biological, chemical and social processes in deltas. This requires an integrated approach, in which knowledge on natural system functioning is combined with knowledge on spatial planning, land and water governance and legislative frameworks. In the research focus area Future Deltas of Utrecht University an interdisciplinary team from different research groups therefore works together. This allows developing integrated sustainable and resilient delta management strategies, which is urgently needed to prevent loss of vital delta services.

  15. Casimir force between $\\delta-\\delta^{\\prime}$ mirrors transparent at high frequencies

    CERN Document Server

    Braga, Alessandra N; Alves, Danilo T

    2016-01-01

    We investigate, in the context of a real massless scalar field in $1+1$ dimensions, models of partially reflecting mirrors simulated by Dirac $\\delta-\\delta^{\\prime}$ point interactions. In the literature, these models do not exhibit full transparency at high frequencies. In order to provide a more realistic feature for these models, we propose a modified $\\delta-\\delta^{\\prime}$ point interaction that enables to achieve full transparency in the limit of high frequencies. Taking this modified $\\delta-\\delta^{\\prime}$ model into account, we investigate the Casimir force, comparing our results with those found in the literature.

  16. Yangtze River Delta, The Works of Nature

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ The Yangtze River Delta or Yangtze Delta,also called Chang Jiang Delta,or the Golden Triangle of the Yangtze,generally comprises the triangular-shaped territory of Wu-speaking Shanghai,southern Jiangsu province and northern Zhejiang province of China.The area lies at the heart of the region traditionally called Jiangnan.The Yangtze River drains into the East China Sea.

  17. Characterization of the load. The experience of the COPEL in acquisition of the load shape typology of its customers; Caracterizacao da carga. A experiencia da COPEL na obtencao da tipologa de carga de seus consumidores

    Energy Technology Data Exchange (ETDEWEB)

    Doria, Ricardo Jose; Nakamura, Satoru; Santos, Nelson Mendes da S.; Fonseca, Carlos Eugenio Lacerda; Batalha, Lucio Flavio; Michelotti, Aristeu; Yokaichiya, Tomaz Hisatoshi; Steudel, Luiz Cesar; Born, Paulo Henrique Siqueira; Koprik, Wilson Jose; Nasser, Ivana Costa; Salmazo, Clovis Tadeu [Companhia Paranaense de Energia (COPEL), Curitiba, PR (Brazil)

    1994-12-31

    This work describes the experience of the COPEL in acquisition of the load shape typology of its customers. It also presents the complete methodology to the survey and analysis of the load shape of its customers in the low voltage 9 refs., 3 figs., 1 tabs.

  18. Pearls in Pearl River Delta

    Institute of Scientific and Technical Information of China (English)

    Yan Manman

    2009-01-01

    @@ When the Pearls in Pearl River Delta (PRD) is mentioned,Hong Kong will also naturally jump to people's mind.It must not only due to PRD's proximity with Hong Kong,but also due to Hong Kong s special role in the development of this region.Admittedly,Hong Kong really provided strong drive for the takeoff of the PRD Economic Zone.But with the prosperity of PRD,the nearly tailored combinations and complementarity have taken shape between Hong Kong and PRD,pushing the economy in the two areas to grow far more rapidly than otherwise.

  19. PENELOPE DELTA, RECENTLY DISCOVERED WRITER

    OpenAIRE

    MALAPANI A.

    2015-01-01

    The aim of this article is to present a Greek writer, Penelope Delta. This writer has recently come up in the field of the studies of the Greek literature and, although thereare neither many translations of her works in foreign languages nor many theses or dissertations, she was chosen for the great interest for her works. Her books have been read by many generations, so she is considered a classical writer of Modern Greek Literature. The way she uses the Greek language, the unique characters...

  20. Scattering coefficients and bound states for high-energy transparent $\\delta-\\delta^{\\prime}$ interactions

    CERN Document Server

    Pedrelli, Danilo C; Braga, Alessandra N; Alves, Danilo T

    2016-01-01

    We propose a model for energy-dependent $\\delta-\\delta^{\\prime}$ interactions which yields scattering coefficients exhibiting full transmission for high-energy incident particles, also computing the bound solutions in one-dimension nonrelativistic quantum mechanics.

  1. Navigational Use of Cassini Delta V Telemetry

    Science.gov (United States)

    Roth, Duane C.; Antreasian, Peter G.; Ardalan, Shadan M.; Criddle, Kevin E.; Goodson, Troy; Ionasescu, Rodica; Jones, Jeremy B.; Parcher, Daniel W.; Pelletier, Frederic J.; Thompson, Paul F.; Vaughan, Andrew T.

    2008-01-01

    Telemetry data are used to improve navigation of the Saturn orbiting Cassini spacecraft. Thrust induced delta V's are computed on-board the spacecraft, recorded in telemetry, and downlinked to Earth. This paper discusses how and why the Cassini Navigation team utilizes spacecraft delta V telemetry. Operational changes making this information attractive to the Navigation Team will be briefly discussed, as will spacecraft hardware and software algorithms responsible for the on-board computation. An analysis of past delta V telemetry, providing calibrations and accuracies that can be applied to the estimation of future delta V activity, is described.

  2. From Natural to Design River Deltas

    Science.gov (United States)

    Giosan, Liviu

    2016-04-01

    Productive and biologically diverse, deltaic lowlands attracted humans since prehistory and may have spurred the emergence of the first urban civilizations. Deltas continued to be an important nexus for economic development across the world and are currently home for over half a billion people. But recently, under the double whammy of sea level rise and inland sediment capture behind dams, they have become the most threatened coastal landscape. Here I will address several deceptively simple questions to sketch some unexpected answers using example deltas from across the world from the Arctic to the Tropics, from the Danube to the Indus, Mississippi to Godavari and Krishna, Mackenzie to Yukon. What is a river delta? What is natural and what is not in a river delta? Are the geological and human histories of a delta important for its current management? Is maintaining a delta the same to building a new one? Can we design better deltas than Nature? These answers help us see clearly that survival of deltas in the next century depends on human intervention and is neither assured nor simple to address or universally applicable. Empirical observations on the hydrology, geology, biology and biochemistry of deltas are significantly lagging behind modeling capabilities endangering the applicability of numerical-based reconstruction solutions and need to be ramped up significantly and rapidly across the world.

  3. Delta hepatitis: another concern for dentistry.

    Science.gov (United States)

    Cottone, J A

    1986-01-01

    Delta hepatitis is a defective virus dependent on hepatitis B virus for replication and transmission. Delta hepatitis infection is becoming more prevalent in the United States, especially in parenteral drug abusers; several outbreaks have occurred. Infection control procedures and the hepatitis B vaccine can protect the dental staff from infection and transmission. PMID:3455994

  4. Electromagnetic excitation of the Delta(1232) resonance

    Energy Technology Data Exchange (ETDEWEB)

    V. Pascalutsa; M. Vanderhaeghen; Shin Nan Yang

    2006-09-05

    We review the description of the lowest-energy nucleon excitation--the Delta(1232)-resonance. Much of the recent effort has been focused on the precision measurements of the nucleon to Delta transition by means of electromagnetic probes. We review the results of those measurements and confront them with the state-of-the-art calculations based on chiral effective-field theories (EFT), lattice QCD, and QCD-inspired models. Some of the theoretical approaches are reviewed in detail. In particular, we describe the chiral EFT of QCD in the energy domain of the Delta-resonance, and its applications to the electromagnetic nucleon-to-Delta transition (gamma N Delta). We also describe the recent dynamical and unitary-isobar models of pion electroproduction which are extensively used in the extraction of the gamma* N Delta form factors from experiment. Furthermore, we discuss the link of the gamma* N Delta form factors to generalized parton distributions (GPDs), as well as the predictions of perturbative QCD for these transition form factors. The present status of understanding the Delta-resonance properties and the nature of its excitation is summarized.

  5. A Cauchy-Dirac delta function

    OpenAIRE

    Katz, Mikhail G.; Tall, David

    2012-01-01

    The Dirac delta function has solid roots in 19th century work in Fourier analysis and singular integrals by Cauchy and others, anticipating Dirac's discovery by over a century, and illuminating the nature of Cauchy's infinitesimals and his infinitesimal definition of delta.

  6. Advances in Delta-md measurements

    OpenAIRE

    Ronga, Frederic Jean

    2003-01-01

    We report the current status of Delta-md measurements at B-factories. The most recent world average is Delta-md = 0.502+-0.007 1/ps (1.4% accuracy). An estimate of the errors for 500 1/fb data is also given.

  7. Delta excitations in neutrino-nucleus scattering

    CERN Document Server

    Kim, H; Horowitz, C J; Kim, Hungchong

    1995-01-01

    We derive the contribution of \\Delta-h excitations to quasielastic charged-current neutrino-nucleus scattering in the framework of relativistic mean-field theory. We discuss the effect of \\Delta production on the determination of the axial mass M_A in neutrino scattering experiments.

  8. Jiaxing: Delicacy of the Yangtze River Delta

    Institute of Scientific and Technical Information of China (English)

    WUXINYI; WANGNAN

    2004-01-01

    THE yangtze River Delta,where the Yangtzc River crosses China's east coast,has one of the country's most dynamic economies.In 1976Jcan Gottmann.a french geographer,called shanghai and its neighboring Yangtze River Delta the world's "sixth largest megalopolis." The Yangtze River Delta has 15 cities. Its territory accounts for one percent of China's total, 5.8 percent of hthe population, and 19.5 percent of the national GDP.In terms of both aggregate economy and growth speed, the Delta currently leads China and could likely be the "enginc" of the world's future economic growth. Located at the juncition of Shanghai Jiangsu and Zhejiang, Jiaxing City holds a central economic belt. It is within 100 kilometers of Shanghai, Hangzhou and Suzhou. In 200 and 2003, Jiaxing's GDP growth rate was first in Zhejiang Province and second among the 1.5 Delta cities.

  9. Entendiendo Delta desde las Humanidades

    Directory of Open Access Journals (Sweden)

    José Calvo Tello

    2016-05-01

    Full Text Available Stylometry is one of the research areas in greater development within Digital Humanities. However, few studies have worked until recently with texts in Spanish and even less so from Spanish-speaking countries. The aim of this paper is to present in Spanish, and without prior statistical knowledge from the reader, one of the main methods used in stylometry, the measure of textual distance Burrows’ Delta. This paper explains this measure using a very small corpus of proverbs and then checks the results in a corpus of Spanish novels. Both data and Python scripts are available to the community through GitHub, commented step by step so that you can play and visualize each step.

  10. EEHG at FLASH and DELTA

    International Nuclear Information System (INIS)

    The echo-enabled harmonic generation (EEHG) scheme utilizes two modulators with two magnetic chicanes in order to generate an electron density modulation with high harmonic content. In contrast to free-electron lasers (FEL) based on self-amplified spontaneous emission (SASE), the radiation of an EEHG FEL has better longitudinal coherence and is naturally synchronized with an external laser, which is advantageous for pump-probe applications. At the free-electron laser in Hamburg (FLASH), an EEHG experiment is currently under preparation. The short-pulse facility at DELTA (a 1.5-GeV synchrotron light source operated by the TU Dortmund University) based on coherent harmonic generation (CHG) will be upgraded using the EEHG technique in order to reach shorter wavelengths.

  11. EEHG at FLASH and DELTA

    Energy Technology Data Exchange (ETDEWEB)

    Molo, Robert; Hoener, Markus; Huck, Holger; Hacker, Kirsten; Khan, Shaukat; Schick, Andreas; Ungelenk, Peter; Zeinalzadeh, Maryam [Center for Synchrotron Radiation (DELTA), TU Dortmund University (Germany); Meulen, Peter van der; Salen, Peter [Stockholm University (Sweden); Angelova Hamberg, Gergana; Ziemann, Volker [Uppsala University (Sweden)

    2013-07-01

    The echo-enabled harmonic generation (EEHG) scheme utilizes two modulators with two magnetic chicanes in order to generate an electron density modulation with high harmonic content. In contrast to free-electron lasers (FEL) based on self-amplified spontaneous emission (SASE), the radiation of an EEHG FEL has better longitudinal coherence and is naturally synchronized with an external laser, which is advantageous for pump-probe applications. At the free-electron laser in Hamburg (FLASH), an EEHG experiment is currently under preparation. The short-pulse facility at DELTA (a 1.5-GeV synchrotron light source operated by the TU Dortmund University) based on coherent harmonic generation (CHG) will be upgraded using the EEHG technique in order to reach shorter wavelengths.

  12. The perception, beliefs and practices toward genitourinary schistosomiasis by inhabitants of selected endemic areas (Edo/Delta States in south-eastern Nigeria Percepção, crenças e práticas sobre a esquistossomose genito-urinária de habitantes de áreas endêmicas selecionadas (Edo/Estados Delta no sudeste da Nigéria

    Directory of Open Access Journals (Sweden)

    Nnamdi Callistus D. Ukwandu

    2004-08-01

    Full Text Available Well-structured questionnaire on the perception, impression and response to genitourinary bilharziasis (Genitourinary schistosomiasis was administered and explained in local languages: 'Igbo' 'Esan' 'Ezon' Itshekiri and Bini to 33815 inhabitants of selected endemic areas in south-eastern Nigeria from January, 1999 to December, 2001. Out of this number, 3815 (11.3% were properly filled and returned. About 42.0% of the inhabitants admitted knowledge of the disease, while 14 (0.4% knew about the aetiologic agent. About 181 (5.0% who responded, admitted procuring treatment, while 100 (5.0% declined to seek treatment of any sort. The relationships between water-bodies and human activities, and infection were well discussed. Amongst those who admitted knowledge of the disease but no knowledge of its etiologic agent, declined seeking treatment of any kind, but believe the disease is a natural phenomenon in ones developmental stage and therefore of no morbidity and mortality. Laboratory analysis of urine, faeces, semen and HVS was employed to assess questionnaire responses, and in some cases, physical examination was utilized to augment laboratory analysis in confirming urinal diagnosis. Haematuria was only directly related to egg count in the early part of life. Females were significantly haematuric and excreted more ova than males (p Um questionário bem estruturado sobre a percepção e práticas e crenças sobre a esquistossomose genito-urinária foi administrado e explicado em dialetos locais: "Igbo" "Esan" "Ezon" Itshekiri e Bini a 33815 habitantes de áreas endêmicas selecionadas no sudeste da Nigéria, de janeiro de 1999 a dezembro de 2001. Deste total, 3815 (11,3% foram preenchidos adequadamente e devolvidos. Cerca de 42,0% dos habitantes admitiram conhecer a doença, enquanto 14 (0,4% conheciam o agente etiológico. Cerca de 181 (5,0% dos que responderam admitiram ter procurado tratamento, enquanto 100 (5,0% não procuraram tratamento de

  13. Three-body calculation of the Delta-Delta dibaryon candidate D(03) at 2.37 GeV

    OpenAIRE

    Gal, Avraham; Garcilazo, Humberto

    2013-01-01

    The D(03) dibaryon is generated dynamically as a resonance pole in a pion-nucleon-Delta' three-body model, where Delta' is a stable Delta baryon. Using separable interactions dominated by the Delta(1232) isobar for pion-nucleon and by the D(12) isobar for nucleon-Delta', where D(12) is the nucleon-Delta 2150 MeV dibaryon deduced in and constrained by 1D2 pp scattering, the model reduces to an effective two-body problem for Delta-Delta' which is solved. The mass and width of D(03) are found cl...

  14. Handle slides for delta-matroids

    OpenAIRE

    Moffatt, Iain; MPHAKO-BANDA, EUNICE

    2015-01-01

    A classic exercise in the topology of surfaces is to show that, using handle slides, every disc-band surface, or 1-vertex ribbon graph, can be put in a canonical form consisting of the connected sum of orientable loops, and either non-orientable loops or pairs of interlaced orientable loops. Motivated by the principle that ribbon graph theory informs delta-matroid theory, we find the delta-matroid analogue of this surface classification. We show that, using a delta-matroid analogue of handle-...

  15. Delta Semantics Defined By Petri Nets

    DEFF Research Database (Denmark)

    Jensen, Kurt; Kyng, Morten; Madsen, Ole Lehrmann

    language designed for general system description. It is partly build upon Simula, but is more than a programming language, since it contains several features, which cannot be implemented on a computer system. E.g. a continuous time concept, concurrency between an unbounded number of components and the...... possibility of using predicates to specify state changes. In this paper a formal semantics for Delta is defined and analysed using Petri nets. Petri nets was chosen because the ideas behind Petri nets and Delta concide on several points. A number of proposals for changes in Delta, which resulted from this...

  16. Experimental delta formation in crater lakes and implications for interpretation of martian deltas

    OpenAIRE

    G de Villiers; Kleinhans, M. G.; Postma, G.

    2013-01-01

    The morphology of delta deposits in crater lakes on Mars is indicative of upstream (e.g., flow discharge and sediment properties) and downstream (e.g., basin characteristics) parameters, from which the hydrological conditions at the time of formation can be inferred. To investigate the influences of these parameters on delta morphology, we experimentally created deltas in crater-shaped basins by feeding a range of constant flow discharges over a feeder channel of various sand textures. We rep...

  17. Delta-nucleus dynamics: proceedings of symposium

    Energy Technology Data Exchange (ETDEWEB)

    Lee, T.S.H.; Geesaman, D.F.; Schiffer, J.P. (eds.)

    1983-10-01

    The appreciation of the role in nuclear physics of the first excited state of the nucleon, the delta ..delta..(1232), has grown rapidly in the past decade. The delta resonance dominates nuclear reactions induced by intermediate energy pions, nucleons, and electromagnetic probes. It is also the most important non-nucleonic degree of freedom needed to resolve many fundamental problems encountered in the study of low-energy nuclear phenomena. Clearly, a new phase of nuclear physics has emerged and conventional thinking must be extended to account for this new dimension of nuclear dynamics. The most challenging problem we are facing is how a unified theory can be developed to describe ..delta..-nucleus dynamics at all energies. In exploring this new direction, it is important to have direct discussions among researchers with different viewpoints. Separate entries were prepared for the 49 papers presented. (WHK)

  18. Legal Delta Boundary, 2001, DWR [ds586

    Data.gov (United States)

    California Department of Resources — The original topographic maps containing the drawn delta border were scanned from the Department of Water Resources. Images were registered to 1:24,000 USGS DRG's...

  19. Greater Sandhill Crane - Delta [ds38

    Data.gov (United States)

    California Department of Resources — This is a data set providing the location and number of sandhill cranes in the Sacramento-San Joaquin Delta area as a product of doing aerial, waterfowl desease...

  20. Cackling Canada goose nesting populations, Yukon Delta

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Number of potential territories, number of cackling Canada Goose nests, and percent occupancy of available territories from CCG plots on the Yukon Delta National...

  1. Yukon Delta coastal processes study: Annual report

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This is an annual report on the Yukon coastal processes. The overall objectives of the project was to provide data on geologic processes in the YukonKuskokwim delta...

  2. Propagator for the double delta potential

    International Nuclear Information System (INIS)

    The propagator for the double delta potential is calculated starting from the integral form of the Schroedinger equation. A compact expression of its Laplace transform is found, that can be explicitly inverted in some limiting cases

  3. Pion-delta sigma-term

    OpenAIRE

    Cavalcante, I. P.; Robilotta, M. R.; Borges, J. Sa; Santos, D. de O.; Zarnauskas, G. R. S.

    2005-01-01

    We use a configuration space chiral model in order to evaluate nucleon and delta sigma-terms. Analytic expressions are consistent with chiral counting rules and give rise to expected non-analytic terms in the chiral limit. We obtain the results $\\sigma_N=46$ MeV and $\\sigma_{\\Delta}=32$ MeV, which are very close to values extracted from experiment and produced by other groups.

  4. Migration in Vulnerable Deltas: A Research Strategy

    Science.gov (United States)

    Hutton, C.; Nicholls, R. J.; Allan, A.

    2015-12-01

    C. Hutton1, & R. J. Nicholls1, , 1 University of Southampton, University Road, Southampton, Hampshire, United Kingdom, SO17 1BJ. cwh@geodata. soton.ac.ukAbstractGlobally, deltas contain 500 million people and with rising sea levels often linked to large number of forced migrants are expected in the coming century. However, migration is already a major process in deltas, such as the growth of major cities such as Dhaka and Kolkata. Climate and environmental change interacts with a range of catchment and delta level drivers, which encompass a nexus of sea-level rise, storms, freshwater and sediment supply from the catchment, land degradation, subsidence, agricultural loss and socio-economic stresses. DECCMA (Deltas, Vulnerability and Climate Change: Migration and Adaptation/CARRIA) is investigating migration in the Ganges-Brahmaputra-Meghna (GBM), Mahanadi and Volta Deltas, including the influence of climate change. The research will explore migration from a range of perspectives including governance and stakeholder analysis, demographic analysis, household surveys of sending and receiving areas, macro-economic analysis, and hazards and hotspot analysis both historically and into the future. Migration under climate change will depend on other adaptation in the deltas and this will be examined. Collectively, integrated analysis will be developed to examine migration, other adaptation and development pathways with a particular focus on the implications for the poorest. This will require the development of input scenarios, including expert-derived exogenous scenarios (e.g., climate change) and endogenous scenarios of the delta developed in a participatory manner. This applied research will facilitate decision support methods for the development of deltas under climate change, with a focus on migration and other adaptation strategies.

  5. Delta-t protocol specification: working draft

    Energy Technology Data Exchange (ETDEWEB)

    Watson, R.W.

    1981-12-04

    This document is one of a series describing protocols associated with the Livermore Interactive Network Communication System (LINCS) hierarchical architecture. At the heart of LINCS is its basic interprocess communication (LINCS-IPC) service. LINCS-IPC defines a reliable, flow controlled, full duplex, uninterpreted, labeled bit stream communication service. LINCS-IPC is level 4 in the LINCS architecture. Level 3 of LINCS is the Network layer defining an internetwork datagram type service. LINCS-IPC interfaces to User processes that utilize higher level syntactic and semantic conventions for process interaction. The transport service provided by the Delta-t protocol can be considered a sublayer of the LINCS-IPC layer. Delta-t augments the Network level service as required to support LINCS-IPC. This document specifies the services provided by the Delta-t protocol to support LINCS-IPC, the operation of Delta-t, and the services Delta-t requires of the Network level. This document was written to be self-contained but the reader will find it useful to have available for reference the LINCS-IPC and LINCS DeltaGram Network layer protocol specifications. Implementations are underway in Pascal for the PDP-11 running under RT11 and RX11, in BLISS for the VAX running under VMS, in MODEL for the CRAY-1 and CDC 7600 running under NLTSS and LTSS, and for the SEL 32/75 running under PORT.

  6. Delta(1232) in piN -> pipiN reaction

    OpenAIRE

    Kamano, Hiroyuki; Arima, Masaki

    2003-01-01

    The contribution of Delta(1232) to the piN -> pipiN reaction is examined by making use of the chiral reduction formula developed by Yamagishi and Zahed. The influence of the pi-Delta-Delta and rho-N-Delta interactions on this reaction, which has not been regarded as important so far, is considered for all channels with the initial pi^{+ -}p states. The total cross sections are calculated to tree level for the energy up to T_{pi}=400 MeV. Although the pi-Delta-Delta and rho-N-Delta interaction...

  7. The Colorado river delta (Mexico: ecological importance and management = O delta do rio Colorado (Mexico: importância ecológica e gerenciamento

    Directory of Open Access Journals (Sweden)

    José Luis Fermán Almada

    2008-10-01

    Full Text Available The Colorado river delta is a unique coastal system in the world, as it combines two important systems: the Colorado river and the Gulf of California. Consequently, the delta is dominated by bilateral interests, and influenced by administrative, political and natural processes, which involve the countries of the United States and Mexico. Located in the northern part of the Gulf of California, under a condition of natural isolation, a series of environmental attributeshave been developed (biotic and abiotic that are only observed in is region. In this work, the development of the bilateral political relations and the most important ecological characteristicsare presented, as well as the management instruments that have been developed for over 80 years. From these issues, the possible scenario for the region is defined, and the development of methodologies for monitoring the effects of these possible tendencies on the natural components of the delta is proposed.O delta do rio Colorado é uma zona costeira única em todo o mundo, porassociar dois importantes sistemas: o próprio rio Colorado e o Golfo da Califórnia. Conseqüentemente, o delta é dominado por interesses bi-nacionais e influenciado por processos administrativos, políticos e naturais, envolvendo os Estados Unidos e o México. Localizado no norte do Golfo da Califórnia, sob uma condição de isolamento natural,desenvolveu-se uma série de atributos ambientais (bióticos e abióticos que só podem ser vistos nessa região. Neste trabalho, são apresentados o desenvolvimento das relações políticas bilaterais e as características ecológicas mais importantes, bem como osmecanismos de gerenciamento que vêm sido desenvolvidos por mais de 80 anos. A partir dessas questões, é definido um cenário tendencial possível para a região, e o desenvolvimento de metodologias para o acompanhamento dos efeitos dessas possíveis tendências sobre os componentes naturais do delta é proposto.

  8. The Okavango: Whose Delta is it?

    Science.gov (United States)

    Magole, Lapologang; Magole, Lefatshe Innocent

    The Okavango Delta is amongst the largest Ramsar sites ( http://www.ramsar.org/sitelist.pdf) in the world and an important wetland for community livelihoods, conservation and tourism in Botswana. Over the years, the utilization of the delta has shifted from communal use to state control, with an increased use for conservation and tourism. This increased use for conservation and tourism has manifested in the physical expansion of the conservation area - Moremi Game Reserve and the formation of Wildlife Management Areas (WMAs) around the reserve, whose primary land use is wildlife utilization. The expansion of the conservation area has translated into several practical matters, including expansion of the area for non-hunting activities or photographic areas. The livelihoods of local communities of the Okavango delta who depended on fishing, hunter-gathering, livestock rearing, rain-fed agriculture and flood recession farming have been negatively affected by the expansion of conservation and tourism in the delta. The livelihoods alternatives in the form of Community Based Natural Resource Management (CBNRM) and tourism have not provided substitutes for the people as the communities are still reliant on the same old livelihood sources as in the past, albeit within smaller and restricted areas. This paper explores the ownership of the natural resources within the Okavango Delta. It asks and attempts to answer the following questions: Who owns and controls the use of the land? Who has access to other resources there in? Who makes the decisions on how the delta resources should be managed and used? Who benefits from the delta resources? We argue firstly that ownership of the delta as defined by legal parameters and demonstrated in natural resource management practice is vested on government. Secondly, government, after assuming ownership of the delta continues to sell its stake to the international community, at the expense of local ownership and access to resources. We

  9. An Eigenvalue Inequality for Schrodinger Operators with delta- and delta '-interactions Supported on Hypersurfaces

    Czech Academy of Sciences Publication Activity Database

    Lotoreichik, Vladimir; Rohleder, J.

    Vol. 247. Basel: Birkhauser Verlag AG, 2015, s. 173-184. ISBN 978-3-319-18181-3. ISSN 0255-0156. [24th International Workshop on Operator Theory and Its Applications (IWOTA). Bangalore (IN), 16.12.2013-20.12.2013] Institutional support: RVO:61389005 Keywords : delta- and delta' - interactions on a hypersurface * discrete spectrum * eigenvalue Subject RIV: BE - Theoretical Physics

  10. Impact of sea-level rise in a Mediteranean delta: The Ebro delta cast

    NARCIS (Netherlands)

    Sánchez-Arcilla, A.; Stive, M.D.F.; Jiménez, J.A.; García, M.A.

    1993-01-01

    In anticipation of a comprehensive, multidisciplinary study on the impact of climatic change on the Ebro Delta preliminary results are here presented of the response of the outer delta coast to present and future relative sea-level rise. Due to the absence of observations and predictions of regional

  11. Integrable mappings derived from the $\\Delta \\Delta RsG$ equation

    OpenAIRE

    Iatrou, Apostolos

    2003-01-01

    In this paper we consider the integrability of the mappings derived from the double discrete related sine-Gordon $(\\Delta \\Delta RsG)$ equation, which we recently introduced in the paper Higher dimensional integrable mappings, under an appropriate periodicity condition.

  12. Houtman Abrolhos Isotope (delta 18O, delta 13C) Data for 1795 to 1994

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — DESCRIPTION: VARIABLES AND UNITS: Column #1: core depth in mm Column #2: delta C-13 vs V-PDB Column #3: delta O-18 vs V-PDB Column #4: assigned date in years A.D....

  13. A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition

    Energy Technology Data Exchange (ETDEWEB)

    G. Ramalho, K. Tsushima

    2010-10-01

    A covariant spectator constituent quark model is applied to study the gamma N -> Delta(1600) transition. Two processes are important in the transition: a photon couples to the individual quarks of the Delta(1600) core (quark core), and a photon couples to the intermediate pion-baryon states (pion cloud). While the quark core contributions are estimated assuming Delta(1600) as the first radial excitation of Delta(1232), the pion cloud contributions are estimated based on an analogy with the gamma N -> Delta(1232) transition. To estimate the pion cloud contributions in the gamma N -> Delta(1600) transition, we include the relevant intermediate states, pi-N, pi-Delta, pi-N(1440) and pi-Delta(1600). Dependence on the four-momentum transfer squared, Q2, is predicted for the magnetic dipole transition form factor, GM*(Q2), as well as the helicity amplitudes, A_1/2(Q2) and A_3/2(Q2). The results at Q2=0 are compared with the existing data.

  14. Holocene evolution of a wave-dominated fan-delta: Godavari delta, India

    Science.gov (United States)

    Saito, Y.; Nageswara Rao, K.; Nagakumar, K.; Demudu, G.; Rajawat, A.; Kubo, S.; Li, Z.

    2013-12-01

    The Godavari delta is one of the world's largest wave-dominated deltas. The Godavari River arises in the Western Ghats near the west coast of India and drains an area of about 3.1x10^5 km^2, flowing about 1465 km southeast across the Indian peninsula to the Bay of Bengal. The Godavari delta consists of a gentle seaward slope from its apex (12 m elevation) at Rajahmundry and a coastal beach-ridge plain over a distance of about 75 km and covers ~5200 km^2 as a delta plain. The river splits into two major distributary channels, the Gautami and the Vasishta, at a barrage constructed in the mid-1800s. The coastal environment of the deltaic coast is microtidal (~1 m mean tidal range) and wave-dominated (~1.5 m mean wave height in the June-September SW monsoon season, ~0.8 m in the NE monsoon season). Models of the Holocene evolution of the Godavari delta have changed from a zonal progradation model (e.g. Nageswara Rao & Sadakata, 1993) to a truncated cuspate delta model (Nageswara Rao et al., 2005, 2012). Twelve borehole cores (340 m total length), taken in the coastal delta plain during 2010-2013, yielded more than 100 C-14 dates. Sediment facies and C-14 dates from these and previous cores and remote-sensing data support a new delta evolution model. The Holocene coastal delta plain is divided into two parts by a set of linear beach ridges 12-14 km landward from the present shoreline in the central part of the delta. The location of the main depocenter (lobe) has shifted during the Holocene from 1) the center to 2) the west, 3) east, 4) center, 5) west, and 6) east. The linear beach ridges separate the first three from the last three stages. These lobe shifts are controlled by river channel shifts near the apex. Just as the current linear shoreline of the central part of the delta and the concave-up nearshore topography are the result of coastal erosion of a cuspate delta, the linear beach ridges indicate a former eroded shoreline. An unconformity within the deltaic

  15. Hydraulic engineering in the social-ecological delta: understanding the interplay between social, ecological, and technological systems in the Dutch delta by means of “delta trajectories”

    NARCIS (Netherlands)

    Staveren, van M.F.; Tatenhove, van J.P.M.

    2016-01-01

    Several of the world's largest deltas have recently been conceptualized as social-ecological delta systems. Although such conceptualizations are valuable in emphasizing complex interaction between social actors and ecological processes in deltas, they do not go into specific dynamics that surround t

  16. MODIFICATION OF DELTA FOR CHOOSER OPTIONS

    Directory of Open Access Journals (Sweden)

    Marek Ďurica

    2015-09-01

    Full Text Available Correctly used financial derivatives can help investors increase their expected returns and minimize their exposure to risk. To ensure the specific needs of investors, a large number of different types of non-standard exotic options is used. Chooser option is one of them. It is an option that gives its holder the right to choose at some predetermined future time whether the option will be a standard call or put with predetermined strike price and maturity time. Although the chooser options are more expensive than standard European-style options, in many cases they are a more suitable instrument for investors in hedging their portfolio value. For an effective use of the chooser option as a hedging instrument, it is necessary to check the values of the Greek parameters delta and gamma for the options. Especially, if the value of the parameter gamma is too large, hedging of the portfolio value using only parameter delta is insufficient and brings high transaction costs because the portfolio has to be reviewed relatively often. Therefore, in this article, a modification of delta-hedging as well as using the value of parameter gamma is suggested. Error of the delta modification is analyzed and compared with the error of widely used parameter delta. Typical patterns for the modified hedging parameter variation with various time to choose time for chooser options are also presented in this article.

  17. Tracking Nile Delta vulnerability to Holocene change.

    Directory of Open Access Journals (Sweden)

    Nick Marriner

    Full Text Available Understanding deltaic resilience in the face of Holocene climate change and human impacts is an important challenge for the earth sciences in characterizing the full range of present and future wetland responses to global warming. Here, we report an 8000-year mass balance record from the Nile Delta to reconstruct when and how this sedimentary basin has responded to past hydrological shifts. In a global Holocene context, the long-term decrease in Nile Delta accretion rates is consistent with insolation-driven changes in the 'monsoon pacemaker', attested throughout the mid-latitude tropics. Following the early to mid-Holocene growth of the Nile's deltaic plain, sediment losses and pronounced erosion are first recorded after ~4000 years ago, the corollaries of falling sediment supply and an intensification of anthropogenic impacts from the Pharaonic period onwards. Against the backcloth of the Saharan 'depeopling', reduced river flow underpinned by a weakening of monsoonal precipitation appears to have been particularly conducive to the expansion of human activities on the delta by exposing productive floodplain lands for occupation and irrigation agriculture. The reconstruction suggests that the Nile Delta has a particularly long history of vulnerability to extreme events (e.g. floods and storms and sea-level rise, although the present sediment-starved system does not have a direct Holocene analogue. This study highlights the importance of the world's deltas as sensitive archives to investigate Holocene geosystem responses to climate change, risks and hazards, and societal interaction.

  18. QCD in the delta-Regime

    CERN Document Server

    Bietenholz, W; Gockeler, M; Horsley, R; Nakamura, Y; Pleiter, D; Rakow, P E L; Schierholz, G; Zanotti, J M

    2011-01-01

    The delta-regime of QCD is characterised by light quarks in a small spatial box, but a large extent in (Euclidean) time. In this setting a specific variant of chiral perturbation theory - the delta-expansion - applies, based on a quantum mechanical treatment of the quasi one-dimensional system. In particular, for vanishing quark masses one obtains a residual pion mass M_pi^R, which has been computed to the third order in the delta-expansion. A comparison with numerical measurements of this residual mass allows for a new determination of some Low Energy Constants, which appear in the chiral Lagrangian. We first review the attempts to simulate 2-flavour QCD directly in the delta-regime. This is very tedious, but results compatible with the predictions for M_pi^R have been obtained. Then we show that an extrapolation of pion masses measured in a larger volume towards the delta-regime leads to good agreement with the theoretical predictions. From those results, we also extract a value for the (controversial) sub-...

  19. Characterization of the natural radioactivity of materials used in civil construction or the Curitiba, Parana state, Brazil, metropolitan region; Caracterizacao da radioatividade natural de materiais utilizados na construcao civil da regiao metropolitana de Curitiba

    Energy Technology Data Exchange (ETDEWEB)

    Perna, Allan F.N.; Martins, Patricia; Paschuk, Sergei A.; Correa, Janine N.; Claro, Flavia Del, E-mail: sergei@utfpr.edu.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Rocha, Zildete; Santos, Talita O., E-mail: rochaz@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2011-07-01

    This paper performs an analysis of the natural radioactivity of construction materials (mainly the {sup 222}Rn) which are present in human environment. The main objective of the study is to characterize different building materials which come from the metropolitan region of the Curitiba related to the exhalation of {sup 222}Rn. The applied methodology analyse the samples of ceramic brick, plaster mortar, and fine lime from the concentration measurements of radon using CR-39 type detectors, and gamma spectrometry analysis

  20. ETBP (Extended True Boiling Point) curve extension of extra heavy crudes; Extensao da curva PEV (Ponto de Ebulicao Verdadeiro) de petroleos extrapesados por destilacao molecular e ampliacao da caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Rodrigo S.; Batistella, Cesar B.; Maciel, Maria Regina W.; Maciel Filho, Rubens [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Engenharia Quimica; Medina, Lilian C. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2008-07-01

    For the determination of the TBP (True Boiling Point) Curve, which defines the yield of petroleum products, the ASTM D2892 method for petroleum distillation and ASTM D5236 method for vacuum distillation of heavy hydrocarbons were applied. Furthermore, from these distillations, cuts that are submitted to several analyses to determine its physical-chemical properties are obtained, and all this information generates the evaluation of petroleum. For heavy petroleum, these conventional methods have been limited, since the total distilled percentage determined for temperatures up to 565 deg C (maximum reached with ASTM D5236 method) is lower for these oils, reducing the points of the curve, limiting its information. To improve this data set for heavy oils, a methodology for the extension of TBP curve through molecular distillation was established. It was possible to reach values up to 700 deg C, representing a considerable progress for the extension of TBP curve. The objective of this work is to present the results of Extended TBP curve for a heavy petroleum and characterization carried out through the cuts and residues obtained in molecular distillation of the residue 'Zeta' 400 deg C+ (fancy name), made by ASTM D2892 method. (author)

  1. El plan del delta - Holanda

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1963-09-01

    Full Text Available Holland is very poor in land resources. Hence its development has been directed towards intensive industrialization and maximum agricultural exploitation. The western part of the country is below sea level and is occupied by 65 percent of the population. Originally the coast consisted of a number of islands, estuaries and slight elevations. Man has transformed this coastline, first making a number of artificial lakes, or polders, and then converting these into fertile districts. These projects protect the soil by means of dykes, which require careful conservation, but even so violent floods are not infrequent. One of the difficult problems involved in this vast enterprise is the complex system of water supply, lines of communication and flow of the rivers into the sea along the estuary zone. This zone is on the south west, and to protect it a National Commission has been set up. After careful study, it was decided that the best defense against the violence of the sea would consist in closing off the inroads of the sea into the continental coastline. The set of hydraulic projects which constitutes this plan for the improvement of the sea defences will take 25 years to fulfil. The general project is highly ambitious and includes both maritime, road and structural works, in which there is a variety of stonework constructions. This paper describes, in brief outline, the main contents of the 11 headings into which the general construction project has been subdivided. In addition, this is supplemented with information on the projects which are already initiated and on the constructional procedure that is being adopted. Of these latter projects, the Nabla bridge is of particular interest. It is situated on the delta. It is made in prestressed concrete, and consists of 17 spans, of 60 length each. This enormous structure, in addition to its great length, and supporting a 22.8 ms wide roadway, is subjected to the tremendous forces 11» of the sea on one

  2. NATO-3C/Delta launch

    Science.gov (United States)

    1978-01-01

    NATO-3C, the third in a series of NATO defense-related communication satellites, is scheduled to be launched on a delta vehicle from the Eastern Test Range no earlier than November 15, 1978. NATO-3A and -3B were successfully launched by Delta vehicles in April 1976 and January 1977, respectively. The NATO-3C spacecraft will be capable of transmitting voice, data, facsimile, and telex messages among military ground stations. The launch vehicle for the NATO-3C mission will be the Delta 2914 configuration. The launch vehicle is to place the spacecraft in a synchronous transfer orbit. The spacecraft Apogee Kick motor is to be fired at fifth transfer orbit apogee to circularize its orbit at geosynchronous altitude of 35,900 km(22,260 miles) above the equator over the Atlantic Ocean somewhere between 45 and 50 degrees W longitude.

  3. Delta(54) flavor phenomenology and strings

    CERN Document Server

    Carballo-Perez, Brenda; Ramos-Sanchez, Saul

    2016-01-01

    Delta(54) can serve as a flavor symmetry in particle physics, but remains almost unexplored. We show that in a classification of semi-realistic Z3xZ3 heterotic string orbifolds, Delta(54) turns out to be the most natural flavor symmetry, providing additional motivation for its study. We revisit its phenomenological potential from a low-energy perspective and subject to the constraints of string models. We find that Delta(54) arising from heterotic orbifolds leads to the Gatto-Sartori-Tonin relation for quarks and charged-leptons. Additionally, in the neutrino sector, it generically leads to a normal hierarchy for neutrino masses and a correlation between the reactor and the atmospheric mixing angles, the latter taking values in the second octant and being compatible at three sigmas with experimental data.

  4. Los reptiles del Delta del Orinoco, Venezuela

    OpenAIRE

    Molina, César; Señaris, josefa; Rivas, Gilson

    2004-01-01

    Como resultado de cinco años (1992-1997) de exploraciones herpetológicas, revisiones bibliográficas y examen de museos nacionales, se presenta un análisis taxonómico, ecológico y biogeográfico preliminar de los reptiles del delta del río Orinoco, Estado Delta Amacuro. Se reconocen 70 especies de reptiles agrupados en tres órdenes, 22 familias y 53 géneros. El orden Squamata es el más diverso, con dominancia de las serpientes de la familias Colubridae y Boidae, y los lagartos de las familias G...

  5. Abraham Reef Stable Isotope Data (delta 13C, delta 18O, delta 14C) for 1635-1957

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Site: Abraham Reef, 22ó 06'S, 153ó 00'E, Porites australiensus, Radiocarbon (delta 14C) and Stable Isotope (del 18O and del 13C) results from bi-annual samples from...

  6. Deltas on the move. Making deltas cope with the effects of climate change

    International Nuclear Information System (INIS)

    This scoping study is the first phase of a study aimed at: (a) providing knowledge on the potential of a system-based approach to deal with the effects of climate change as an alternative for the more traditional technical measures such as dams, dikes and surge barriers. This should be shown for both rich and poor countries and should address hydrological, ecological as well as socio-economic aspects; and (b) identifying the potential to market these results worldwide. To reach these objectives four research steps are defined: (1) to make an inventory of deltas: their vulnerability to the effects of climate change; (2) development of indicators for successful use of a system-based approach; (3) to provide an overview of the potential of soft measures for these deltas; (4) to select a number of deltas with potential for marketing system-based measures and the development of strategies to link economic and ecological objectives. This scoping study addresses step 1 only. The results from step 1 will be used as a starting point for steps 2 and 3. The outputs of this scoping study are threefold: a background report (this report); a flyer with a brief description of the findings; a website with information on delta's and how these may be affected by climate change. The scoping study will roughly outline which deltas are still functioning in a more or less natural manner - or could be (re)developed in that direction - and thus would be good candidates for a system-based approach. Chapter 2 gives a description of the geomorphological and ecological processes in a delta. In addition, those aspects of climate change that can have an effect on deltas are described. The third chapter deals with human interventions in deltas and whether or not they fit within a system-based approach. In a system-based approach, as presented in Chapter 4, natural processes are given free reign where possible. Chapter 5 shows how available data on deltas could be used in such a system

  7. Modeling delta growth and channel geometry on Wax Lake Delta, Louisiana. Preliminary results

    Science.gov (United States)

    Viparelli, E.; Czapiga, M. J.; Li, C.; Shaw, J. B.; Parker, G.

    2013-12-01

    A numerical model of delta growth, in which the distributary channels are assumed to have self-constructed their cross sections, is validated on Wax Lake Delta, Louisiana. As in previous laterally averaged models of delta growth, the delta is divided in a low slope delta top, a steep delta front and a low slope basement. The flow on the delta top is assumed steady, and a backwater formulation is implemented. Since one or more channels can actively transport water and sediment on the delta top during floods, we simplify the problem by assuming that the bed material is transported in one rectangular channel, with width and depth roughly equal to the sum of the active channel widths, and to the average depth of the active channels. The problem is characterized by one equation (i.e. the backwater equation) in two unknowns, the channel width and depth. Another equation is thus needed to close the problem. Under the assumptions that 1) the system is at bankfull flow, and 2) the Shields number in the channels is equal to its channel formative value, our closure relation is a channel-formative criterion. In particular, a recently derived relation to estimate the formative (bankfull) Shields number as a function of the friction slope is implemented. Recent field work on Wax Lake Delta shows that the distributary channels are incising into a relatively stiff basement. In our model we do not attempt to directly model channel incision, but we implicitly account for it with a modified formulation to compute the shoreline migration rate. In this formulation the bed material at the shoreline is trapped in the non-channelized portion of the delta front only. Measured and numerical shoreline migration rates, longitudinal profiles of delta elevation, and channel geometry, i.e. width and depth, are compared. In the relatively near future we plan to 1) use our model to estimate land-building potential of engineered diversions of the Mississippi River, and 2) couple the present model

  8. How Deltas Die - a Case Study of the End of Sedimentation in Two Giant Deltas

    Science.gov (United States)

    Macdonald, D.; Robinson, P.; Nicholson, U.

    2013-12-01

    Most well-studied deltas are on passive margins (e.g. Mississippi, Rhone, Ebro), where the main tectonic control on accommodation space is thermal subsidence. As long as the main river in the sediment routing system keeps flowing, there is no particular reason for sedimentation to end, and some deltas have a history extending more than 100 Ma (e.g. Niger at 130 Ma). However, some very large deltas can build out over active margins. For example, the Amur, Orinoco, and Colorado (US) deltas all straddle strike-slip plate boundaries and are much less long-lived than their passive margin counterparts. This paper looks in detail at the end of the deltaic sedimentation in the Pliocene deltas of the Amur River on the island of Sakhalin, and the Colorado River in the Fish Creek-Vallecito Basin of southern California. In both cases the deltas are sand-rich with distant provenances in East Asia and the Colorado Plateau respectively; also they both coexist with locally derived clastic sedimentation. Despite these similarities, there are significant differences between the two deltas as a direct result of the differences in plate boundary movement rates and tectonic state. On Sakhalin, the plate boundary has moved at about 1.95 mm a-1 during the Pliocene and has been in a transpressional state. Primary deltaic sedimentation ended by a three main mechanisms: uplift of the island along the transpressional plate boundary detached the delta from the trunk stream; growth of anticlines over strands of the plate boundary disrupted the consequent delta-top drainage; and late sedimentation involved reworking of the far-travelled deltaic material. In California, where the plate boundary has moved at about 50 mm a-1 in the Pliocene, deltaic sedimentation ceased by translation of the receiving basin from the river mouth. New field and mineralogical data suggest that Colorado River sedimentation waned over a period of about 1 Ma in the Late Pliocene, and was gradually overwhelmed by locally

  9. Habitat Management Plan for Delta and Breton National Wildlife Refuges

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Delta and Breton NWRs Habitat Management Plan provides a long-term vision and specific guidance on managing habitats for the resources of concern at Delta and...

  10. Recoil effects in the electroproduction of the delta

    International Nuclear Information System (INIS)

    Two quark-meson soliton models - the Linear Sigma Model and the Chromodielectric Model - are used to describe the nucleon and delta excitation. Treating the delta as a bound state, we obtain its electroproduction amplitudes corrected for recoil effects. (author)

  11. The Sedimentation and recent geologic history of the Missisquoi Delta

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This thesis presents a geological history of the Missisquoi Delta. Included in this report is a delta model, jet flow theory and the location of river mouth bars....

  12. Da Kantsa

    OpenAIRE

    Martínez, Alaín; Villalvilla, Camilo; Quintero, Rolando; Echevarria, Juan Carlos; Sanfiel, Jorge Luis San; Copperini, Luis A. P.

    2015-01-01

    Catálogo de las tres exposiciones (La bota rusa, Carne rusa y Da Kantsa/ ?? ?????) que desde 2011 han reunido en la Galería Maroya de Cienfuegos a artistas cubanos bajo la evocación de lo ruso-soviético. Las muestras se han celebrado en colaboración con el Fondo Cubano de Bienes Materiales. Desde Kamchatka agradecemos la colaboración de Miguel Ángel Rodríguez, de la Galería Maroya, y a Camilo Villalvilla. 

  13. Hepatitis delta virus in homosexual men in Sydney.

    OpenAIRE

    Bodsworth, N J; Donovan, B; Gold, J; Cossart, Y E

    1989-01-01

    In countries not generally endemic for hepatitis B, homosexual men who are carriers of hepatitis B surface antigen (HBsAg) have to date largely been spared additional delta virus infection. A focus of homosexually acquired delta has, however, recently been identified in California. To assess the prevalence and risk factors for delta virus infection in homosexual men in Sydney, we tested the sera of 204 homosexual men with acute or chronic hepatitis B infection for total antibody to delta and ...

  14. Delta governance: The DNA of a specific kind of urbanization

    OpenAIRE

    Boelens, L.

    2014-01-01

    Urbanization is the result of the way leading actors, volatile factors, and historic and dynamic institutional settings interact. However, major differences occur between what we might call Capital and Delta metropolitan areas. This paper compares the governance of two of these Metropolitan Delta Areas: the Euro Delta of the Rhine–Meuse–Scheldt and the Pearl River Delta of the Xi–Bei–Dong – partly historically but also with respect to recent developments within governments, businesses and civ...

  15. Comparative assessment of the vulnerability and resilience of 10 deltas : work document

    NARCIS (Netherlands)

    Bucx, T.; Marchand, M.; Makaske, B.; Guchte, van de C.

    2010-01-01

    Background information about: Nile delta (Egypt), Incomati delta (Mozambique), Ganges-Brahmaputra-Meghna (Bangladesh), Yangtze (China), Ciliwung (Indonesia), Mekong (Vietnam), Rhine-Meuse (The Netherlands), Danube (Romania), California Bay-Delta, Mississippi River Delta (USA)

  16. Results in one, two, and three dimensions, for delta functions, square wells, and delta shells, respectively

    International Nuclear Information System (INIS)

    I will outline three-particle calculations, and results, in one dimension with delta-function interactions, in two dimensions for square wells and in three dimensions with delta shells. The presentation will be that of my own work, obtained together with colleagues. The initial approach is that of expansions of the wave function in terms of Hyperspherical adiabatic functions, usually deduced from hyperspherical harmonics. Refs. 15 (author)

  17. Stellar Delta Matter with Delta-Meson Coupling Constants Constrained by QCD Sum Rule

    International Nuclear Information System (INIS)

    In the present work we determine the equation of state of delta-resonance-rich stellar matter and discuss the effects of the baryon-meson coupling constants on the delta population in the stellar medium. We extended the non-linear Walecka (NLW) model to accommodate in the context of the relativistic mean field approximation the Rarita-Schwinger field for the spin 3/2 resonances.

  18. 78 FR 45592 - DeltaPoint Capital IV, LP;

    Science.gov (United States)

    2013-07-29

    ... ADMINISTRATION DeltaPoint Capital IV, LP; Notice Seeking Exemption Under Section 312 of the Small Business Investment Act, Conflicts of Interest Notice is hereby given that DeltaPoint Capital IV, L.P., 45 East Avenue... Business Administration (``SBA'') Rules and Regulations (13 CFR 107.730). DeltaPoint Capital IV,...

  19. GPC Using a Delta-Domain Emulator-Based Approach

    DEFF Research Database (Denmark)

    Lauritsen, Morten Bach; Jensen, Morten Rostgaard; Poulsen, Niels Kjølstad

    1997-01-01

    This paper describes new approaches to generalized predictive control formulated in the delta (delta) domain. A new delta-domain version of the continuous-time emulator-based predictor is presented. It is shown to contain the optimal discrete-time predictor based on incomplete information as a sp...

  20. Morphodynamics of a cyclic prograding delta: the Red River, Vietnam

    NARCIS (Netherlands)

    Maren, D.S. van

    2004-01-01

    River deltas are inhabited by over 60% of the world population, and are, consequently, of paramount agricultural and economical importance. They constitute unique wetland envi ronments which gives river deltas ecological importance as well. Additionally, many deltas contain large accumulations of oi

  1. Momentum distribution of Delta- isobar in closed shell nuclei

    OpenAIRE

    Tabachenko, A. N.

    2005-01-01

    One Delta- isobar components of the wave function in closed shell nuclei are considered within the framework of the harmonic oscillator model. Conventional transition potential is the pi- and rho- exchange potential. On the basis of the Delta- isobar configuration wave function, the momentum distribution of the Delta- isobar is calculated for the light nuclei $^4 He$,$^{16}O$,$^{12}C$

  2. deltaPlotR: An R Package for Di?erential Item Functioning Analysis with Ango? s Delta Plot

    OpenAIRE

    David Magis; Bruno Facon

    2014-01-01

    Angoff's delta plot is a straightforward and not computationally intensive method to identify differential item functioning (DIF) among dichotomously scored items. This approach was recently improved by proposing an optimal threshold selection and by considering several item purification processes. Moreover, to support practical DIF analyses with the delta plot and these improvements, the R package deltaPlotR was also developed. The purpose of this paper is twofold: to outline the delta plot ...

  3. Clostridium perfringens Delta-Toxin Induces Rapid Cell Necrosis

    Science.gov (United States)

    Seike, Soshi; Miyamoto, Kazuaki; Kobayashi, Keiko; Takehara, Masaya; Nagahama, Masahiro

    2016-01-01

    Clostridium perfringens delta-toxin is a β-pore-forming toxin and a putative pathogenic agent of C. perfringens types B and C. However, the mechanism of cytotoxicity of delta-toxin remains unclear. Here, we investigated the mechanisms of cell death induced by delta-toxin in five cell lines (A549, A431, MDCK, Vero, and Caco-2). All cell lines were susceptible to delta-toxin. The toxin caused rapid ATP depletion and swelling of the cells. Delta-toxin bound and formed oligomers predominantly in plasma membrane lipid rafts. Destruction of the lipid rafts with methyl β-cyclodextrin inhibited delta-toxin-induced cytotoxicity and ATP depletion. Delta-toxin caused the release of carboxyfluorescein from sphingomyelin-cholesterol liposomes and formed oligomers; toxin binding to the liposomes declined with decreasing cholesterol content in the liposomes. Flow cytometric assays with annexin V and propidium iodide revealed that delta-toxin treatment induced an elevation in the population of annexin V-negative and propidium iodide-positive cells. Delta-toxin did not cause the fragmentation of DNA or caspase-3 activation. Furthermore, delta-toxin caused damage to mitochondrial membrane permeability and cytochrome c release. In the present study, we demonstrate that delta-toxin produces cytotoxic activity through necrosis. PMID:26807591

  4. Clostridium perfringens Delta-Toxin Induces Rapid Cell Necrosis.

    Directory of Open Access Journals (Sweden)

    Soshi Seike

    Full Text Available Clostridium perfringens delta-toxin is a β-pore-forming toxin and a putative pathogenic agent of C. perfringens types B and C. However, the mechanism of cytotoxicity of delta-toxin remains unclear. Here, we investigated the mechanisms of cell death induced by delta-toxin in five cell lines (A549, A431, MDCK, Vero, and Caco-2. All cell lines were susceptible to delta-toxin. The toxin caused rapid ATP depletion and swelling of the cells. Delta-toxin bound and formed oligomers predominantly in plasma membrane lipid rafts. Destruction of the lipid rafts with methyl β-cyclodextrin inhibited delta-toxin-induced cytotoxicity and ATP depletion. Delta-toxin caused the release of carboxyfluorescein from sphingomyelin-cholesterol liposomes and formed oligomers; toxin binding to the liposomes declined with decreasing cholesterol content in the liposomes. Flow cytometric assays with annexin V and propidium iodide revealed that delta-toxin treatment induced an elevation in the population of annexin V-negative and propidium iodide-positive cells. Delta-toxin did not cause the fragmentation of DNA or caspase-3 activation. Furthermore, delta-toxin caused damage to mitochondrial membrane permeability and cytochrome c release. In the present study, we demonstrate that delta-toxin produces cytotoxic activity through necrosis.

  5. Delta(1232) in piN -> pipiN reaction

    CERN Document Server

    Kamano, H; Kamano, Hiroyuki; Arima, Masaki

    2003-01-01

    The contribution of Delta(1232) to the piN -> pipiN reaction is examined by making use of the chiral reduction formula developed by Yamagishi and Zahed. The influence of the \\pi\\Delta\\Delta and \\rho\\N\\Delta interactions on this reaction, which has not been regarded as important so far, is considered for all channels with the initial pi^{+ -}p states. The total cross sections are calculated to tree level for the energy up to T^{pi}=400 MeV. Although the \\pi\\Delta\\Delta and \\rho\\N\\Delta interactions give a small effect on the \\pi^{+}p -> pi^{+}pi^{+}n, pi^{-}p -> pi^{+}pi^{-}n and pi^{-}p -> pi^{0}pi^{0}p channels, the pi^{+ -}p -> pi^{+ -}pi^{0}p channels are found to be sensitive to these interactions.

  6. Space Radar Image of Mississippi Delta

    Science.gov (United States)

    1999-01-01

    This is a radar image of the Mississippi River Delta where the river enters into the Gulf of Mexico along the coast of Louisiana. This multi-frequency image demonstrates the capability of the radar to distinguish different types of wetlands surfaces in river deltas. This image was acquired by the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) aboard the space shuttle Endeavour on October 2, 1995. The image is centered on latitude 29.3 degrees North latitude and 89.28 degrees West longitude. The area shown is approximately 63 kilometers by 43 kilometers (39 miles by 26 miles). North is towards the upper right of the image. As the river enters the Gulf of Mexico, it loses energy and dumps its load of sediment that it has carried on its journey through the mid-continent. This pile of sediment, or mud, accumulates over the years building up the delta front. As one part of the delta becomes clogged with sediment, the delta front will migrate in search of new areas to grow. The area shown on this image is the currently active delta front of the Mississippi. The migratory nature of the delta forms natural traps for oil and the numerous bright spots along the outside of the delta are drilling platforms. Most of the land in the image consists of mud flats and marsh lands. There is little human settlement in this area due to the instability of the sediments. The main shipping channel of the Mississippi River is the broad red stripe running northwest to southeast down the left side of the image. The bright spots within the channel are ships. The colors in the image are assigned to different frequencies and polarizations of the radar as follows: red is L-band vertically transmitted, vertically received; green is C-band vertically transmitted, vertically received; blue is X-band vertically transmitted, vertically received. Spaceborne Imaging Radar-C and X-band Synthetic Aperture Radar (SIR-C/X-SAR) is part of NASA's Mission to Planet Earth. The radars

  7. Delta-nucleus dynamics: proceedings of symposium

    International Nuclear Information System (INIS)

    The appreciation of the role in nuclear physics of the first excited state of the nucleon, the delta Δ(1232), has grown rapidly in the past decade. The delta resonance dominates nuclear reactions induced by intermediate energy pions, nucleons, and electromagnetic probes. It is also the most important non-nucleonic degree of freedom needed to resolve many fundamental problems encountered in the study of low-energy nuclear phenomena. Clearly, a new phase of nuclear physics has emerged and conventional thinking must be extended to account for this new dimension of nuclear dynamics. The most challenging problem we are facing is how a unified theory can be developed to describe Δ-nucleus dynamics at all energies. In exploring this new direction, it is important to have direct discussions among researchers with different viewpoints. Separate entries were prepared for the 49 papers presented

  8. Pluviometric anomaly in the Llobregat Delta

    Directory of Open Access Journals (Sweden)

    J. Mazón

    2009-01-01

    Full Text Available The data from surface automatic weather stations show that in the area of the Llobregat delta (northeast of the Iberian Peninsula we can observe greater precipitation than in nearby inland areas (Ordal, Collserola, Garraf, than on the other side of a massif located on the coast (Garraf and than on the northern coast. This distribution of the precipitation could be explained by the formation of a nocturnal surface cold front in the Llobregat delta. In order to analyze in-depth the physical mechanisms that can influence the formation of this front (topography, sea and drainage winds, two rain episodes in the area were simulated with the MM5 mesoscale model, reproducing satisfactorily the physical mechanisms that favor the appearance of the front.

  9. New depositional model for Mississippi River delta plain

    Energy Technology Data Exchange (ETDEWEB)

    Penland, S.; Kosters, E.C.; Suter, J.R.

    1987-05-01

    The current Mississippi River delta plain model depicts a single Holocene delta plain consisting of six delta complexes sequentially deposited over the last 7000 years by the classic delta switching process. In order of increasing age, these complexes are the Atchafalaya, Balize, Lafourche, St. Bernard, Teche, and Maringouin. Between 1981 and 1986, the Louisiana Geological Survey has acquired more than 10,000 km of high-resolution seismic profiles, 248 offshore vibracores, 397 onshore vibracores, 234 soil borings, and 226 new radiocarbon dates throughout south Louisiana. Analysis of this data set led to the development of a new, more precise stratigraphic model which depicts the Mississippi delta plain as actually two individual, imbricated shelf-phase delta plains deposited at different sea level stillstands. Termed the Modern and Late Holocene, these two delta plains are separated by a ravinement surface several hundred kilometers in extent that can be traced updip to a relict-transgressive shoreline, termed the Penchant Shoreline. The Late Holocene delta plain consists of a set of delta complexes 15-20 m thick deposited during a sea level stillstand 6 m below the present, 4500-7000 y.B.P. This unit consists of the exposed Maringouin and Teche delta complexes offshore of south-central Louisiana and an unnamed delta complex buried by the Modern delta plain in southeast Louisiana. A relative sea level rise between 2800-4500 y.B.P. to about present sea level led to the transgressive submergence of the Late Holocene delta plain, generating Trinity Shoal, Ship Shoal, and the Penchant Shoreline, which represents the subsurface eastern extension of the Vermilion Bay shoreline. The 10-15-m thick Modern delta plain began building seaward of the penchant Shoreline about 2800 y.B.P.

  10. Current activities at the DELTA THz beamline

    International Nuclear Information System (INIS)

    In addition to an InSb Bolometer, which detects laser-induced coherent THz pulses at the synchrotron light source DELTA since June 2011, a Fourier transform infrared spectrometer is currently being commissioned. Furthermore, a fast hot-electron bolometer has been used in cooperation with the Karlsruhe Institute of Technology to study the evolution of the laser-induced electron density modulation over several revolutions in the storage ring.

  11. Current activities at the DELTA THz beamline

    Energy Technology Data Exchange (ETDEWEB)

    Ungelenk, Peter; Hoener, Markus; Huck, Holger; Khan, Shaukat; Molo, Robert; Schick, Andreas; Zeinalzadeh, Maryam [Center for Synchrotron Radiation (DELTA), TU Dortmund University, 44227 Dortmund (Germany)

    2013-07-01

    In addition to an InSb Bolometer, which detects laser-induced coherent THz pulses at the synchrotron light source DELTA since June 2011, a Fourier transform infrared spectrometer is currently being commissioned. Furthermore, a fast hot-electron bolometer has been used in cooperation with the Karlsruhe Institute of Technology to study the evolution of the laser-induced electron density modulation over several revolutions in the storage ring.

  12. Adaptive Delta Management: cultural aspects of dealing with uncertainty

    Science.gov (United States)

    Timmermans, Jos; Haasnoot, Marjolijn; Hermans, Leon; Kwakkel, Jan

    2016-04-01

    Deltas are generally recognized as vulnerable to climate change and therefore a salient topic in adaptation science. Deltas are also highly dynamic systems viewed from physical (erosion, sedimentation, subsidence), social (demographic), economic (trade), infrastructures (transport, energy, metropolization) and cultural (multi-ethnic) perspectives. This multi-faceted dynamic character of delta areas warrants the emergence of a branch of applied adaptation science, Adaptive Delta Management, which explicitly focuses on climate adaptation of such highly dynamic and deeply uncertain systems. The application of Adaptive Delta Management in the Dutch Delta Program and its active international dissemination by Dutch professionals results in the rapid dissemination of Adaptive Delta Management to deltas worldwide. This global dissemination raises concerns among professionals in delta management on its applicability in deltas with cultural conditions and historical developments quite different from those found in the Netherlands and the United Kingdom where the practices now labelled as Adaptive Delta Management first emerged. This research develops an approach and gives a first analysis of the interaction between the characteristics of different approaches in Adaptive Delta Management and their alignment with the cultural conditions encountered in various delta's globally. In this analysis, first different management theories underlying approaches to Adaptive Delta Management as encountered in both scientific and professional publications are identified and characterized on three dimensions: The characteristics dimensions used are: orientation on today, orientation on the future, and decision making (Timmermans, 2015). The different underlying management theories encountered are policy analysis, strategic management, transition management, and adaptive management. These four management theories underlying different approaches in Adaptive Delta Management are connected to

  13. GLOBAL CHARM OF THE CHANGJIANG RIVER DELTA

    Institute of Scientific and Technical Information of China (English)

    CHEN Shu-peng; ZHOU Cheng-hu; CHEN Qiu-xiao

    2003-01-01

    Based on the theory of geo-economy, under the new situation of global economy, information network and China's entry into WTO, also with the holding of APEC (in 2001) and the International Exposition in the near future, the Changjiang (Yangtze) River Delta is striding toward the spectacular international multi-polar situation and becomes one of core regions with high-speed development. Facing the ocean and world all along, leading the progressive tides of the age and scintillating the splendor of the nation, she does advance with time. Through a long period of irrigation projects construction and intensive operation of lands in previous agricultural society, the artificial wetland ecosystem with a positive cycle had ever been formed in this region. At present, environmental pollution and urban expansion resulted from post-industrialization are being rectified. The delta will be the paradigm of industrial and agricultural modernization along the sustainable development road. With the rapid development of urbanization,she has been one of the regions with the highest density population and high urbanization level. Taking the Changjiang River estuary and the Hangzhou Bay as two parts, she is continuously strengthening and adjusting her interiorstructure, expanding mothball space and constructing the oriental modern "logistics center" to link the whole world. The butterfly-style urban system of the Changjiang River Delta is flying, probably engendering earthshaking "butterfly effect".

  14. Modelling repeatedly flaring delta-sunspots

    CERN Document Server

    Chatterjee, Piyali; Carlsson, Mats

    2016-01-01

    Active regions (AR) appearing on the surface of the Sun are classified into $\\alpha$, $\\beta$, $\\gamma$, and $\\delta$ by the rules of the Mount Wilson Observatory, California on the basis of their topological complexity. Amongst these, the $\\delta$-sunspots are known to be super-active and produce the most X-ray flares. Here, we present results from a simulation of the Sun by mimicking the upper layers and the corona, but starting at a more primitive stage than any earlier treatment. We find that this initial state consisting of only a thin sub-photospheric magnetic sheet breaks into multiple flux-tubes which evolve into a colliding-merging system of spots of opposite polarity upon surface emergence, similar to those often seen on the Sun. The simulation goes on to produce many exotic $\\delta$-sunspot associated phenomena: repeated flaring in the range of typical solar flare energy release and ejective helical flux ropes with embedded cool-dense plasma filaments resembling solar coronal mass ejections.

  15. Delta count-rate monitoring system

    International Nuclear Information System (INIS)

    A need for a more effective way to rapidly search for gamma-ray contamination over large areas led to the design and construction of a very sensitive gamma detection system. The delta count-rate monitoring system was installed in a four-wheel-drive van instrumented for environmental surveillance and accident response. The system consists of four main sections: (1) two scintillation detectors, (2) high-voltage power supply amplifier and single-channel analyzer, (3) delta count-rate monitor, and (4) count-rate meter and recorder. The van's 6.5-kW generator powers the standard nuclear instrument modular design system. The two detectors are mounted in the rear corners of the van and can be run singly or jointly. A solid-state bar-graph count-rate meter mounted on the dashboard can be read easily by both the driver and passenger. A solid-state strip chart recorder shows trends and provides a permanent record of the data. An audible alarm is sounded at the delta monitor and at the dashboard count-rate meter if a detected radiation level exceeds the set background level by a predetermined amount

  16. Delta: Data Reduction for Integrated Application Workflows.

    Energy Technology Data Exchange (ETDEWEB)

    Lofstead, Gerald Fredrick [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Jean-Baptiste, Gregory [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oldfield, Ron A. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2015-06-01

    Integrated Application Workflows (IAWs) run multiple simulation workflow components con- currently on an HPC resource connecting these components using compute area resources and compensating for any performance or data processing rate mismatches. These IAWs require high frequency and high volume data transfers between compute nodes and staging area nodes during the lifetime of a large parallel computation. The available network band- width between the two areas may not be enough to efficiently support the data movement. As the processing power available to compute resources increases, the requirements for this data transfer will become more difficult to satisfy and perhaps will not be satisfiable at all since network capabilities are not expanding at a comparable rate. Furthermore, energy consumption in HPC environments is expected to grow by an order of magnitude as exas- cale systems become a reality. The energy cost of moving large amounts of data frequently will contribute to this issue. It is necessary to reduce the volume of data without reducing the quality of data when it is being processed and analyzed. Delta resolves the issue by addressing the lifetime data transfer operations. Delta removes subsequent identical copies of already transmitted data during transfers and restores those copies once the data has reached the destination. Delta is able to identify duplicated information and determine the most space efficient way to represent it. Initial tests show about 50% reduction in data movement while maintaining the same data quality and transmission frequency.

  17. Pion-proton scattering and isospin breaking in the $\\Delta^{0}$-$\\Delta^{++}$ system

    CERN Document Server

    Bernicha, A; Pestieau, J; Castro, G Lopez

    1996-01-01

    We determine the mass and width of the \\Delta^{++}\\ (\\Delta^0) resonance from data on \\pi^+ p\\ (\\pi^- p) scattering both, in the pole of the S-matrix and conventional Breit-Wigner approaches to the scattering amplitude. We provide a simple formula that relates the two definitions for the parameters of the \\Delta. Isospin symmetry breaking in the \\d0-\\dm system depends on the definition of the resonant properties: we find M_0-M_{++} = 0.40 \\pm 0.57\\ {\\rm MeV},\\ \\Gamma_0 -\\Gamma_{++} = 6.89 \\pm 0.95\\ {\\rm MeV} in the pole approach while \\wt{M}_0-\\wt{M}_{++} = 2.25 \\pm 0.68\\ {\\rm MeV},\\ \\wt{\\Gamma}_0 - \\wt{\\Gamma}_{++} = 8.45 \\pm 1.11\\ {\\rm MeV} in the conventional approach.

  18. A fileira da cereja da Cova da Beira

    OpenAIRE

    Dias, Cláudia Sofia Lourenço

    2013-01-01

    A Cova da Beira apresenta excelentes condições edafo-climáticas para a cultura da cerejeira, nomeadamente para a produção precoce de cultivares como a Burlat e para a produção tardia como a Saco Cova da Beira. Assim, é natural que a Cova da Beira seja a NUTS III com níveis mais elevados de produção, superfície e produtividade. Apesar de alguns produtores, sobretudo os de menor dimensão, não se terem conseguido adaptar às novas exigências do consumo e enfrentarem constrangimento...

  19. Delta-semidefinite and delta-convex quadratic forms in Banach spaces

    OpenAIRE

    Kalton, N.; Konyagin, S. V.; Vesely, L.

    2006-01-01

    A continuous quadratic form ("quadratic form", in short) on a Banach space $X$ is: (a) delta-semidefinite (i.e., representable as a difference of two nonnegative quadratic forms) if and only if the corresponding symmetric linear operator $T\\colon X\\to X^*$ factors through a Hilbert space; (b) delta-convex (i.e., representable as a difference of two continuous convex functions) if and only if $T$ is a UMD-operator. It follows, for instance, that each quadratic form on an infinite-dimensional $...

  20. Upper-division student difficulties with the Dirac delta function

    CERN Document Server

    Wilcox, Bethany R

    2015-01-01

    The Dirac delta function is a standard mathematical tool that appears repeatedly in the undergraduate physics curriculum in multiple topical areas including electrostatics, and quantum mechanics. While Dirac delta functions are often introduced in order to simplify a problem mathematically, students still struggle to manipulate and interpret them. To characterize student difficulties with the delta function at the upper-division level, we examined students' responses to traditional exam questions and a standardized conceptual assessment, and conducted think-aloud interviews. Our analysis was guided by an analytical framework that focuses on how students activate, construct, execute, and reflect on the Dirac delta function in the context of problem solving in physics. Here, we focus on student difficulties using the delta function to express charge distributions in the context of junior-level electrostatics. Common challenges included: invoking the delta function spontaneously, translating a description of a c...

  1. Compositeness of the Delta(1232) resonance in pi N scattering

    CERN Document Server

    Sekihara, Takayasu; Yamagata-Sekihara, Junko; Yasui, Shigehiro

    2015-01-01

    We evaluate the $\\pi N$ compositeness of the $\\Delta (1232)$ resonance so as to clarify the internal structure of $\\Delta (1232)$ in terms of the $\\pi N$ component. Here the compositeness is defined as contributions from two-body wave functions to the normalization of the total wave function and is extracted from the $\\pi N$ scattering amplitude. In this study we employ the chiral unitary approach with the interaction up to the next-to-leading order plus a bare $\\Delta$ term in chiral perturbation theory and describe $\\Delta (1232)$ in an elastic $\\pi N$ scattering. Fitting the $\\pi N$ scattering amplitude to the solution of the partial wave analysis, we obtain a large real part of the $\\pi N$ compositeness for $\\Delta (1232)$ comparable to unity and non-negligible imaginary part as well, with which we reconfirm the result in the previous study on the $\\pi N$ compositeness for $\\Delta (1232)$.

  2. THE RURAL TOURISM IN DANUBE DELTA

    Directory of Open Access Journals (Sweden)

    Ionica SOARE

    2014-06-01

    Full Text Available Purpose - the purpose of this paper is to evaluate the rural areas has market size and forecast its development as an economic activity. The present paper aims at analyzing the rural areas has in Danube Delta. In an enviable BAs which have responsibility for their particular isolated, such as the Danube Delta and the Danube that used, fishing and rural areas has the main activities that provide jobs and income sources for local populations. Design/methodology/approach - A survey was administered to customers’ rural hostel accommodation in Danube Delta. Descriptive statistics method was mainly adopted to calculate the mean with standard deviation of entry assumes variable, and to examine the different levels of consumers' awareness. The index values of product familiarity, the ratio between entries assumes product's familiarity value and the average value. Findings - the research results show hash has rural consumers have different perception and accomplished through behaviour. The information channels of brand hash mainly from friends, relatives and neighbours, so word of mouth spreading is very important for a brand. Women show a higher sensitivity in health and are currently operating the propensity than referred to follow the recommendations for nutrition. Research limitations/implications - This item is intended to synthesize developments and challenges," on June 13th rural market growth has. The results of this paper should be considered tentatively until has also features replicated by larger has rural consumers. Originality/value - members of rural areas has consumer's behavior would improve marketing and the development of rural areas has products, in order to reduce consumer confusion.

  3. Tidal river dynamics: Implications for deltas

    Science.gov (United States)

    Hoitink, A. J. F.; Jay, D. A.

    2016-03-01

    Tidal rivers are a vital and little studied nexus between physical oceanography and hydrology. It is only in the last few decades that substantial research efforts have been focused on the interactions of river discharge with tidal waves and storm surges into regions beyond the limit of salinity intrusion, a realm that can extend inland hundreds of kilometers. One key phenomenon resulting from this interaction is the emergence of large fortnightly tides, which are forced long waves with amplitudes that may increase beyond the point where astronomical tides have become extinct. These can be larger than the linear tide itself at more landward locations, and they greatly influence tidal river water levels and wetland inundation. Exploration of the spectral redistribution and attenuation of tidal energy in rivers has led to new appreciation of a wide range of consequences for fluvial and coastal sedimentology, delta evolution, wetland conservation, and salinity intrusion under the influence of sea level rise and delta subsidence. Modern research aims at unifying traditional harmonic tidal analysis, nonparametric regression techniques, and the existing understanding of tidal hydrodynamics to better predict and model tidal river dynamics both in single-thread channels and in branching channel networks. In this context, this review summarizes results from field observations and modeling studies set in tidal river environments as diverse as the Amazon in Brazil, the Columbia, Fraser and Saint Lawrence in North America, the Yangtze and Pearl in China, and the Berau and Mahakam in Indonesia. A description of state-of-the-art methods for a comprehensive analysis of water levels, wave propagation, discharges, and inundation extent in tidal rivers is provided. Implications for lowland river deltas are also discussed in terms of sedimentary deposits, channel bifurcation, avulsion, and salinity intrusion, addressing contemporary research challenges.

  4. Constraint on $\\Delta g(x)$ at large $x$

    OpenAIRE

    Hirai, M; Kumano, S.; Saito, N

    2006-01-01

    We investigate the polarized gluon distribution \\Delta g(x) by a global analysis of current DIS data and the \\pi^0 data from RHIC-Spin experiments. The \\pi^0 data provide a strong constraint on \\Delta g(x), so that its uncertainty is reduced. Furthermore, new DIS data of COMPASS and HERMES play an important role in determining \\Delta g(x) at large x.

  5. Delta Doping High Purity CCDs and CMOS for LSST

    Science.gov (United States)

    Blacksberg, Jordana; Nikzad, Shouleh; Hoenk, Michael; Elliott, S. Tom; Bebek, Chris; Holland, Steve; Kolbe, Bill

    2006-01-01

    A viewgraph presentation describing delta doping high purity CCD's and CMOS for LSST is shown. The topics include: 1) Overview of JPL s versatile back-surface process for CCDs and CMOS; 2) Application to SNAP and ORION missions; 3) Delta doping as a back-surface electrode for fully depleted LBNL CCDs; 4) Delta doping high purity CCDs for SNAP and ORION; 5) JPL CMP thinning process development; and 6) Antireflection coating process development.

  6. Isobar configurations: $\\Delta N$ correlations versus the independent particle model

    OpenAIRE

    Glavanakov, I. V.; Tabachenko, A. N.

    2014-01-01

    We present a comparative analysis of two models for the $A( {\\gamma,\\,\\pi N})B$ reaction, which take into account the isobar configurations in the ground state of the nuclei: the $\\Delta N$ correlation model and the quasifree pion photoproduction model. The considered models differ in their descriptions of the nucleus states. The $\\Delta N$ correlation model takes into account the dynamic correlations of the nucleon and isobar formed in the virtual transition $NN \\to \\Delta N$, and in the qua...

  7. Identification and characterization of Delta12, Delta6, and Delta5 Desaturases from the green microalga Parietochloris incisa.

    Science.gov (United States)

    Iskandarov, Umidjon; Khozin-Goldberg, Inna; Cohen, Zvi

    2010-06-01

    The freshwater microalga Parietochloris incisa accumulates, under nitrogen starvation, large amounts of triacylglycerols containing approximately 60% of the omega6 very long-chain polyunsaturated fatty acid (VLC-PUFA), arachidonic acid. Based on sequence homology, we isolated three cDNA sequences from P. incisa, designated PiDesD12, PiDesD6, PiDesD5. The deduced amino acid sequences of the three genes contained three conserved histidine motifs; the front-end desaturases, PiDes6 and PiDes5, contained a fused N-terminal cytochrome b5 domain. By functional characterization in the yeast Saccharomyces cerevisiae, we confirmed that PiDesD6, PiDesD5 cDNA encode membrane bound desaturases with Delta6, and Delta5 activity, respectively. Both PiDes6 and PiDes5 can indiscriminately desaturate both omega6 and omega3 substrates. A phylogenetic analysis showed that the three genes were homologous to the corresponding desaturases from green microalgae and lower plants that were functionally characterized. Quantitative real-time PCR revealed the concerted expression pattern of all three genes in P. incisa cells subjected to nitrogen starvation, featuring maximum expression level on day 3 of starvation, corresponding to the sharpest increase in the share of arachidonic acid. PMID:20467827

  8. Monitoring the Polarimetric Variability of \\delta\\ Scorpii

    CERN Document Server

    Bednarski, Daniel

    2012-01-01

    The Be star \\delta\\ Scorpii is an interesting binary system, whose primary companion created a circumstellar disk after the periastron passage of the secondary in 2000, being since then classified as Be. This work presents the results of a long-term monitoring of this star in broad-band imaging polarimetry. The observational data collected since 2006 in the Pico dos Dias Observatory (Brazil) show a variable polarization that seems to correlate with the photometric light curve. From this data we see that the disk density varied since 2006; furthermore, the data suggests that there was some disturbance of the disk during the last periastron passage in July, 2011.

  9. Delta Alerts: Changing Outcomes in Geriatric Trauma.

    Science.gov (United States)

    Wiles, Lynn L; Day, Mark D; Harris, LeAnna

    2016-01-01

    Geriatric trauma patients (GTPs) suffering minor injuries have suboptimal outcomes compared with younger populations. Patients 65 years or older account for 10% of all traumas but 28% of all trauma deaths. This trauma center established a third tier trauma alert specifically targeting GTPs at risk for poor outcomes. A Delta Alert is activated when GTPs suffer injuries that fall outside traditional trauma alert guidelines. Early identification and treatment of injuries and expedited referral to specialty groups have improved our GTPs' outcomes including decreased mortality and length of stay and increased percentage of GTPs who are discharged home. PMID:27414140

  10. Solid waste management in Mekong Delta

    OpenAIRE

    Nguyen, Xuan Hoang; Le, Hoang Viet

    2012-01-01

    Municipal solid waste (MSW) in Vietnam has been increasing quickly and became one of the most considered environmental problems in Mekong Delta (MD) region covering 13 provinces and municipalities in the south of Vietnam. With a considerably large amount of MSW, the region produces about 5% of the total amount of MSW of the country. The collection rate of solid waste is about quite high (65 - 72%) in the cities and rather low (about 40 - 55%) in the rural areas, with a high content in organic...

  11. Tracks, spurs, blobs and delta-rays

    International Nuclear Information System (INIS)

    The track of a high-energy particle is the collection of all transient species created by the particle in the total degradation of its energy. Visible electron tracks are called delta rays. A microscopic description of the track with all its knocked-out electrons leads to spurs, blobs, and short tracks. Energy deposition criteria for these three track entities are 6 to 100 eV, 100 to 500 eV, and 500 eV to 5 keV, respectively

  12. Hepatitis Delta Virus: A Peculiar Virus

    OpenAIRE

    Carolina Alves; Cristina Branco; Celso Cunha

    2013-01-01

    The hepatitis delta virus (HDV) is distributed worldwide and related to the most severe form of viral hepatitis. HDV is a satellite RNA virus dependent on hepatitis B surface antigens to assemble its envelope and thus form new virions and propagate infection. HDV has a small 1.7 Kb genome making it the smallest known human virus. This deceivingly simple virus has unique biological features and many aspects of its life cycle remain elusive. The present review endeavors to gather the available ...

  13. Error Minimization of Polynomial Approximation of Delta

    Indian Academy of Sciences (India)

    Islam Sana; Sadiq Muhammad; Qureshi Muhammad Shahid

    2008-09-01

    The difference between Universal time (UT) and Dynamical time (TD), known as Delta ( ) is tabulated for the first day of each year in the Astronomical Almanac. During the last four centuries it is found that there are large differences between its values for two consecutive years. Polynomial approximations have been developed to obtain the values of for any time of a year for the period AD 1620 to AD 2000 (Meeu 2000) as no dynamical theories describe the variations in . In this work, a new set of polynomials for is obtained for the period AD 1620 to AD 2007 that is found to produce better results compared to previous attempts.

  14. Studying medium effects with the optimized {delta} expansion

    Energy Technology Data Exchange (ETDEWEB)

    Krein, G. [Instituto de Fisica Teorica (IFT), Sao Paulo, SP (Brazil); Menezes, D.P. [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Fisica; Nielsen, M. [Sao Paulo Univ., SP (Brazil). Inst. de Fisica; Pinto, M.B. [Montpellier-2 Univ., 34 (France). Lab. de Physique Mathematique

    1995-04-01

    The possibility of using the optimized {delta} expansion for studying medium effects on hadronic properties in quark or nuclear matter is investigated. The {delta} expansion is employed to study density effects with two commonly used models in hadron and nuclear physics, the Nambu-Jona-Lasinio model for the dynamical chiral symmetry breaking and the Walecka model for the equation of state of nuclear matter. The results obtained with the {delta} expansion are compared to those obtained with the traditional Hartree-Fock approximation. Perspectives for using the {delta} expansion in other field theoretic models in hadron and nuclear physics are discussed. (author). 17 refs, 9 figs.

  15. GPC Using a Delta-Domain Emulator-Based Approach

    DEFF Research Database (Denmark)

    Lauritsen, Morten Bach; Jensen, Morten Rostgaard; Poulsen, Niels Kjølstad

    1997-01-01

    are considered: one having a well-defined limit as the sampling period tends to zero, the other being a close approximation to the conventional discrete-time GPC. Both algorithms are discrete in nature and well-suited for adaptive control. The fact that delta-domain models are used does not introduce......This paper describes new approaches to generalized predictive control formulated in the delta (delta) domain. A new delta-domain version of the continuous-time emulator-based predictor is presented. It is shown to contain the optimal discrete-time predictor based on incomplete information as a...

  16. QCD sum rules for $\\Delta$ isobar in nuclear matter

    OpenAIRE

    Jin, Xuemin

    1994-01-01

    The self-energies of $\\Delta$ isobar propagating in nuclear matter are calculated using the finite-density QCD sum-rule methods. The calculations show that the Lorentz vector self-energy for the $\\Delta$ is significantly smaller than the nucleon vector self-energy. The magnitude of the $\\Delta$ scalar self-energy is larger than the corresponding value for the nucleon, which suggests a strong attractive net self-energy for the $\\Delta$; however, the prediction for the scalar self-energy is ver...

  17. Inferring heterogeneity in aquitards using high-resolution deltaD and delta18O profiles.

    Science.gov (United States)

    Hendry, M Jim; Wassenaar, L I

    2009-01-01

    Vertical depth profiles of pore water isotopes (deltaD and delta18O) in clay-rich aquitards have been used to show that solute transport is dominated by molecular diffusion, to define the timing of geologic events, and to estimate vertical hydraulic conductivity. The interpretation of the isotopic profiles in these studies was based on pore water samples collected from piezometers installed in nests (typically 4 to 15 piezometers) over depths of 10 to 80 m. Data from piezometer nests generally have poor vertical resolution (meters), raising questions about their capacity to reveal the impact of finer scale heterogeneities such as permeable sand bodies or fractured till zones on solute transport. Here, we used high-resolution (30-cm) depth profiles of deltaD and delta18O from two continuously cored boreholes in a till aquitard to provide new insights into the effects of sand bodies on solute transport. High-resolution core-derived profiles indicate that such heterogeneities can cause major deviations from one-dimensional diffusion profiles. Further, comparison of piezometer-measured values with best-fit diffusion trends shows subtle deviations, suggesting the presence of heterogeneities that should not be ignored. High-resolution profiles also more clearly defined the contact between the highly fractured oxidized zone and the underlying unoxidized zone than the piezometers. PMID:19735307

  18. Delta Plaza kohvik = The Delta Plaza Café / Margit Mutso

    Index Scriptorium Estoniae

    Mutso, Margit, 1966-

    2010-01-01

    Tallinnas Pärnu mnt. 141 asuva kohviku Delta Plaza sisekujundusest. Sisearhitektid Tiiu Truus ja Marja Viltrop (Stuudio Truus OÜ). Hoone arhitektid Jüri Okas ja Marika Lõoke (AB J. Okas & M. Lõoke). Žürii liikme Mait Summataveti arvamus kohvikust

  19. Validating methods for measuring delta18O and delta13C in otoliths from freshwater fish.

    Science.gov (United States)

    Guiguer, K R R A; Drimmie, R; Power, M

    2003-01-01

    The ability of the phosphoric acid digestion technique to extract carbon dioxide from biogenic carbonates and reliably reproduce delta(18)O and delta(13)C signatures from standard reference materials (NBS-18, NBS-19) was tested and shown to produce accurate, unbiased measurements of non-biologic materials. The effects of roasting preparation methods commonly reported when analyzing biogenic carbonates were also tested in a series of experiments using reference standards and otoliths obtained from aquacultured Arctic charr and rainbow trout. Roasting had no effect on the isotope measurement of reference standards. No significant differences between mean oxygen isotope signatures from paired experiments with roasted and non-roasted fish otoliths were found. However, otolith oxygen isotope measurements were significantly enriched in comparison to rearing water-based measurements for both species. Agreement between expected isotopic equilibrium and measured otolith delta(18)O values varied as a function of roasting temperature and between species. Criteria for the selection of appropriate roasting temperatures are suggested and favour 350 degrees C in freshwater fish where unbiased estimates of average rearing water temperatures and known differences in rearing temperatures were obtained. Carbon isotopic disequilibria were observed for both species. A mixing model analysis established differences in the percentage of metabolically derived carbon in studied otoliths, with Arctic charr deriving a greater proportion of otolith delta(13)C from metabolism as a result of higher metabolic rates. PMID:12590395

  20. Clinical application of Delta4%Delta4的临床应用研究

    Institute of Scientific and Technical Information of China (English)

    张伟; 马照; 邵鹏; 马金波; 刘培继; 刘鹏

    2010-01-01

    Objective To compare two verification tools for intensity modulated radiotherapy (IM-RT) and to investigate the feasibility of a new three dimensitional verification tool. Methods Five patients receiving IMRT were randomly chosen for the quality assurance plans with MapCHECK Model 1175 (SunNu-clear, Melbourne, FL,USA) and Delta4(ScandiDos, Sweden) by using Philips Pinnacle 8.0D treatment planning system. Dose verification was measured with the Varian Clinical 23EX LA. Results The overall average percentages of pass points in DD2% DTA2 mm, DD3% DTA3 mm and DD4% DTA4 mm were 84.7%, 97. 1% and 99.3% with MapCHECK Model 1175, 86.2%, 98.2% and 99.6% with Delta4 re-spectively. The differences were statisticically significant (t = 3.94, P = 0.003 ; t = 3.17, P = 0.011 ; t = 3.05 ,P =0.014,respectively). The gantry angle was changed to zero degree with MapCHECK, but not with Delta. The effects were embodied with Delta, such as the gravity on leaf position accuracy of MLC, the treat-ment table on dose distribution and the earth magnetism on dose system. Conclusion Delta4 is an ideal verification tool for intensity modulated radiotherapy.%目的 通过两种调强放疗验证工具的分析比对,探讨一种全新三维验证工具临床应用的可行性.方法 从接受调强放疗患者中随机抽取5例,分别在飞利浦Pinnacle 8.0D治疗计划系统中做MapCHECK Model 1175(Sun Nuclear,Melbourne,FL,USA)设计和Deha4(ScandiDos,Sweden)设计,然后分别在瓦里安Clinal 23EX直线加速器上做剂量验证测量.计较Delta4和MapCHECK计划中相同剂量偏差(DD2%、DD3%、DD4%)和吻合距离(IYFA2 mm、DTA3 mm、DTA4 mm)数值时的通过率差异.结果 用MapCHECK Model 1175测量的剂量偏差为DD2%DTA2 mm、DD3%DTA3 mm、DD4%DTA4 mm时总的平均通过率分别为84.7%、97.1%、99.3%;用Delta4测量的分别为86.2%、98.2%、99.6%;3组数据比较差异均有统计学意义(t=3.94,P=0.003;t=3.17,P=0.011;t=3.05,P=0.014).MapCHECK的质量保证计划

  1. Radial and nonradial periods of Delta Scuti

    International Nuclear Information System (INIS)

    Five periods have been discussed by Smith (1981) for the prototype variable star delta Scuti. The main one, at 0.193772 day, has long been identified as the radial fundamental mode. The others have not been clearly understood, but the second radial overtone is probably the correct identification for the 0.116366 day period. The other three at 0.186891, 0.189435, and 0.211157 day seem to be nonradial modes because of their long periods. The first of these seems to have l = 2 and m = -2 as observed by Smith. Table 1 gives these observed periods. Based on the Fitch (1981) nonradial pulsation constants, the 4.48 hour (.187 day) period seems to be a p1 mode, but as we shall see, we find that this identification is not very certain. The goal of this paper is to use our nonradial nonadiabatic computing program to predict periods in this range for a model matching the observed parameters of delta Scuti and to identify all five periods

  2. Multidecadal Fluvial Sediment Fluxes to Deltas under Environmental Change Scenarios

    Science.gov (United States)

    Dunn, Frances; Darby, Stephen; Nicholls, Robert

    2016-04-01

    Sediment delivery is vital to sustain delta environments on which over half a billion people live worldwide. Due to factors such as subsidence and sea level rise, deltas sink relative to sea level if sediment is not delivered to and retained on their surfaces. Deltas which sink relative to sea level experience flooding, land degradation and loss, which endangers anthropogenic activities and populations. The future of fluvial sediment fluxes, a key mechanism for sediment delivery to deltas, is uncertain due to complex environmental changes which are predicted to occur over the coming decades. This research investigates fluvial sediment fluxes under environmental changes in order to assess the sustainability of delta environments under potential future scenarios up to 2100. Global datasets of climate change, reservoir construction, and population and GDP as proxies for anthropogenic influence through land use changes are used to drive the catchment numerical model WBMsed, which is being used to investigate the effects of these environmental changes on fluvial sediment delivery. This process produces fluvial sediment fluxes under multiple future scenarios which will be used to assess the future sustainability of a selection of 8 vulnerable deltas, although the approach can be applied to deltas worldwide. By modelling potential future scenarios of fluvial sediment flux, this research contributes to the prognosis for delta environments. The future scenarios will inform management at multiple temporal scales, and indicate the potential consequences for deltas of various anthropogenic activities. This research will both forewarn managers of potentially unsustainable deltas and indicate those anthropogenic activities which encourage or hinder the creation of sustainable delta environments.

  3. Rastreamento da fibrose cística usando-se a análise combinada do teste de IRT neonatal e o estudo molecular da mutação DF508

    OpenAIRE

    Cabello Giselda M.K.; Cabello Pedro H; Roig Silvia R.S.; Fonseca Armando; Carvalho Eulália C.D.; Fernandes Octavio

    2003-01-01

    Um total de 117 cartões de rastreamento neonatal foi selecionado anonimamente para a avaliação de fibrose cística (FC) pela análise da mutação deltaF508 usando-se a técnica da reação em cadeia da polimerase (PCR), seguida de eletroforese em gel de poliacrilamida (Page) e pela quantificação da imunotripsina reativa (IRT, Delfia). Uma concentração de IRT menor que 140ng/ml foi encontrada em 116 recém-nascidos. Entre estes foi detectado um heterozigoto deltaF508 com uma concentração de IRT de 4,...

  4. The Concentration Dependence of the (Delta)s Term in the Gibbs Free Energy Function: Application to Reversible Reactions in Biochemistry

    Science.gov (United States)

    Gary, Ronald K.

    2004-01-01

    The concentration dependence of (delta)S term in the Gibbs free energy function is described in relation to its application to reversible reactions in biochemistry. An intuitive and non-mathematical argument for the concentration dependence of the (delta)S term in the Gibbs free energy equation is derived and the applicability of the equation to…

  5. Upper-Division Student Difficulties with the Dirac Delta Function

    Science.gov (United States)

    Wilcox, Bethany R.; Pollock, Steven J.

    2015-01-01

    The Dirac delta function is a standard mathematical tool that appears repeatedly in the undergraduate physics curriculum in multiple topical areas including electrostatics, and quantum mechanics. While Dirac delta functions are often introduced in order to simplify a problem mathematically, students still struggle to manipulate and interpret them.…

  6. Delta: the First Pion Nucleon Resonance - Its Discovery and Applications

    Science.gov (United States)

    Nagle, D. E.

    1984-07-01

    It is attempted to recapture some of the fun and excitement of the pion-scattering work that led to the discovery of what is now called the delta particle. How significant this discovery was became apparent only gradually. That the delta is alive today and thriving at Los Alamos (as well as other places) is described.

  7. Design of the workplace for a Delta Robot

    OpenAIRE

    Romeo Alba, Xavier

    2010-01-01

    This project presents an introduction to parallel kinematic robots focused on Delta robot from the point of view of applications, kinematics, mechanics and investigation. The second part of the document shows the implantation of the fastest Delta robot (FANUC M-1iA 0.5A) at University of Zilina.

  8. Aitken delta-squared generalized Juncgk-type iterative procedure

    International Nuclear Information System (INIS)

    This paper discusses a general Aitken delta-squared generalized Jungck-modified S -iterative scheme. The study applies generalized versions of Aitken delta-squared procedure and Venter theorem to discuss positivity and global stability of the generalized Jungck iterative scheme which is of interest in numerical methods and its acceleration of convergence.

  9. Emerging leadership from communities in the Lower Mississippi Delta (LMD)

    Science.gov (United States)

    The Delta NIRI (Nutrition Intervention Research Initiative) team has conducted several research studies in the Lower Mississippi Delta (LMD) region employing the community-based participatory research (CBPR) model. Our collaborative work in the LMD focuses on interventions conducted in each of our c...

  10. Delta-isobar magnetic form factor in QCD

    CERN Document Server

    Belyaev, V M

    1993-01-01

    We consider the QCD sum rules approach for Delta-isobar magnetic form factor in the infra-red region $0Delta-isobar magnetic moment.

  11. Redundance of $\\Delta$-isobar Parameters in Effective Field Theories

    OpenAIRE

    Tang, Hua-Bin; Ellis, Paul J.

    1996-01-01

    It is shown that the off-shell parameters in the interaction Lagrangian of pions, nucleons, and $\\Delta$-isobars are redundant in the framework of effective field theories. Our results also suggest the necessity of including the $\\Delta$ as an explicit dynamical degree of freedom.

  12. Antinociceptive activity of Delta9-tetrahydrocannabinol non-ionic microemulsions.

    Science.gov (United States)

    Lazzari, P; Fadda, P; Marchese, G; Casu, G L; Pani, L

    2010-06-30

    Delta(9)-Tetrahydrocannabinol (Delta(9)-THC), the major psychoactive constituent of Cannabis sativa L., has been widely studied for its potential pharmaceutical application in the treatment of various diseases and disturbs. This sparingly soluble terpeno-phenolic compound is not easy to handle and to be formulated in pharmaceutical preparations. The aim of this work was to develop a stable aqueous Delta(9)-THC formulation acceptable for different ways of administration, and to evaluate the therapeutic properties of the new Delta(9)-THC based preparation for pain treatment. Due to the thermodynamic stability and advantages of microemulsion based systems, the study was focused on the identification of aqueous microemulsion based systems containing Delta(9)-THC. Oil in water Delta(9)-THC microemulsions were individuated through phase diagrams construction, using the non-ionic surfactant Solutol HS15, being this surfactant acceptable for parenteral administration in human. A selected microemulsion samples containing 0.2 wt% of Delta(9)-THC, stable up to 52 degrees C, was successfully assayed on animal models of pain. Significant antinociceptive activity has been detected by both intraperitoneal and intragastric administration of the new Delta(9)-THC pharmaceutical preparation. The effect has been highlighted in shorter time if compared to a preparation of the same active principle based on previously reported conventional preparation. PMID:20399844

  13. The evolution of a subaqueous delta in the Anthropocene: A stratigraphic investigation of the Brazos River delta, TX USA

    Science.gov (United States)

    Carlin, Joseph A.; Dellapenna, Timothy M.

    2015-12-01

    Globally, deltas are increasingly threatened by anthropogenic activities. As a result, deltas now evolve through the combined effects of natural and human-induced processes occurring throughout the fluvial-deltaic system. The Brazos River delta, located along the Texas coast in the northwestern Gulf of Mexico, and its watershed have been impacted by direct and indirect human activities since the late 19th century. This provides an opportunity to investigate how such alterations have shaped the evolution of a delta in the Anthropocene, a time when humans are drivers of geological change. Historic alteration to the delta and watershed include extensive agricultural activity, jetty construction at the mouth in the late 1890s, mouth diversion ~10 km to the southwest in 1929, and reservoir construction throughout the early and mid 20th Century. Three subaerial deltaic geometries provided the framework to connect subaerial deltaic responses, to the anthropogenic alterations, to the resulting stratigraphic characteristics observed in the subaqueous delta. This study utilized high-resolution geophysical data (swath bathymetry, side scan sonar, CHIRP subbottom profiling) on the subaqueous delta to investigate the subaqueous delta stratigraphy and infer the processes that shaped the deltaic record over time. The results showed distinct areas across the subaqueous delta that were dominated by erosion and deposition. Erosional areas corresponded to earlier growth phase depocenters being exposed at the surface, while the depositional areas corresponded to areas with the most recent growth phase depocenter overlying the earlier depocenters. These results highlight that the subaqueous depocenter has migrated westward over time, consistent with the observed changes to the subaerial delta. Additionally, the data showed that evidence for these past growth phases and depocenters may be preserved within the subaqueous delta, even after subaerial portions of the delta returned to pre

  14. 76 FR 37643 - Safety Zone; Delta Independence Day Foundation Celebration, Mandeville Island, CA

    Science.gov (United States)

    2011-06-28

    ... Independence Day Foundation Celebration, Mandeville Island, CA AGENCY: Coast Guard, DHS. ACTION: Temporary... Delta Independence Day Fireworks Foundation Celebration. This temporary safety zone is established to... Purpose The Delta Independence Day Foundation will sponsor the Delta Independence Day...

  15. Cystic fibrosis Delta F508 heterozygotes, smoking, and reproduction

    DEFF Research Database (Denmark)

    Dahl, Morten; Tybjaerg-Hansen, A; Wittrup, H H;

    1998-01-01

    Cystic fibrosis is the most common fatal autosomal recessive disease affecting Caucasian populations. It remains a puzzle how this disease is maintained at such a remarkably high incidence, however, it could be due to a reproductive advantage in cystic fibrosis heterozygotes. We tested this...... hypothesis. An adult Danish general population sample of 9141 individuals was screened for cystic fibrosis DeltaF508 heterozygotes; 250 carriers of this mutation were identified (2.7%). In the total sample DeltaF508 heterozygotes did not have more children than noncarriers; however, smoking interacted with.......001). In conclusion, overall these results do not support a reproductive advantage for cystic fibrosis DeltaF508 heterozygotes. However, the data cannot totally exclude the possibility that nonsmoking DeltaF508 heterozygotes experience a reproductive advantage while smoking DeltaF508 heterozygotes...

  16. Effects of isovector scalar $\\delta$-meson on hypernuclei

    CERN Document Server

    Ikram, M; Biswal, S K; Patra, S K

    2014-01-01

    We analyze the effects of $\\delta-$ meson on hypernuclei within the frame-work of relativistic mean field theory. The $\\delta-$ meson is included into the Lagrangian for hypernuclei. The extra nucleon-meson coupling ($g_\\delta$) affects the every piece of physical observables, like binding energy, radii and single particle energy of hypernuclei. The lambda mean field potential is investigated which is consistent with other predictions. Flipping of single particle energy levels are observed with the strength of $g_\\delta$ in the considered hypernuclei as well as normal nuclei. The spin-orbit potentials are observed for considered hypernuclei and the effect of $g_\\delta$ on spin-orbit potentials is also analyzed. The calculated single-$\\Lambda$ binding energies ($B_\\Lambda$) are quite agreeable with the experimental data.

  17. Automatic Detection of Magnetic delta in Sunspot Groups

    CERN Document Server

    Padinhatteeri, Sreejith; Bloomfield, D Shaun; Gallagher, Peter T

    2015-01-01

    Large and magnetically complex sunspot groups are known to be associated with flares. To date, the Mount Wilson scheme has been used to classify sunspot groups based on their morphological and magnetic properties. The most flare prolific class, the delta sunspot-group, is characterised by opposite polarity umbrae within a common penumbra, separated by less than 2 degrees. In this article, we present a new system, called the Solar Monitor Active Region Tracker - Delta Finder (SMART-DF), that can be used to automatically detect and classify magnetic deltas in near-realtime. Using continuum images and magnetograms from the Helioseismic and Magnetic Imager (HMI) onboard NASA's Solar Dynamics Observatory (SDO), we first estimate distances between opposite polarity umbrae. Opposite polarity pairs having distances of less that 2 degrees are then identified, and if these pairs are found to share a common penumbra, they are identified as a magnetic delta configuration. The algorithm was compared to manual delta detect...

  18. $\\Delta(27)$ family symmetry and neutrino mixing

    CERN Document Server

    Varzielas, Ivo de Medeiros

    2015-01-01

    The observed neutrino mixing, having a near maximal atmospheric neutrino mixing angle and a large solar mixing angle, is close to tri-bi-maximal. This structure may be related to the existence of a discrete non-Abelian family symmetry. In this paper the family symmetry is the non-Abelian discrete group $\\Delta(27)$, a subgroup of $SU(3)$ with triplet and anti-triplet representations. Different frameworks are constructed in which the mixing follows from combining fermion mass terms with the vacuum structure enforced by the discrete symmetry. Mass terms for the fermions originate from familon triplets, anti-triplets or both. Vacuum alignment for the family symmetry breaking familons follows from simple invariants.

  19. Surface Delta Interaction and g factors

    CERN Document Server

    Yu, Xiaofei

    2015-01-01

    Using an attractive surface delta interaction we obtain wave functions for 2 neutrons (or neutron holes) in the model space of 2 orbits (l=4, j=7/2) and (l=2, j=5/2). If we take the single particle energies to be degenerate we find that the g factors for I=2, 4 and 6 are all the same -namely the orbital g factor of the single nucleon. For a free neutron this quantity zero all 2particle or 2 hole g factors are equal to zero as well.. Only the orbital part of the g -factors contribute - the spin part cancels out. We then consider the effects of introducing a single energy splititng between the 2 orbits.

  20. $\\delta N$ formalism from superpotential and holography

    CERN Document Server

    Garriga, Jaume; Vernizzi, Filippo

    2016-01-01

    We consider the superpotential formalism to describe the evolution of scalar fields during inflation, generalizing it to include the case with non-canonical kinetic terms. We provide a characterization of the attractor behaviour of the background evolution in terms of first and second slow-roll parameters (which need not be small). We find that the superpotential is useful in justifying the separate universe approximation from the gradient expansion, and also in computing the spectra of primordial perturbations around attractor solutions in the $\\delta N$ formalism. As an application, we consider a class of models where the background trajectories for the inflaton fields are derived from a product separable superpotential. In the perspective of the holographic inflation scenario, such models are dual to a deformed CFT boundary theory, with $D$ mutually uncorrelated deformation operators. We compute the bulk power spectra of primordial adiabatic and entropy cosmological perturbations, and show that the results...

  1. Spectral factorization using the delta operator

    DEFF Research Database (Denmark)

    Rostgaard, Morten; Poulsen, Niels Kjølstad; Ravn, Ole

    1994-01-01

    an efficient way. The discrete-time method of Kuccera will not be applied since numerical word-length characteristics will be poor for fast sampling rates. In this paper a new approach is considered. A new gamma-operator (Tustin operator) is introduced, in order to make an iterative and numerical......In recent years many papers have been published abouth the gamma-operator, mostly caused by the better numerical properties and the rapprochement between continuous and discrete time. A major problem within the LQG-design of a delta-based input-output relation has been how to spectral-factorize in...... stable solution to the spectral factorization problem. The key idea is to use the gamma-operator resembled by its behavior to the differential operator....

  2. Experimental delta network module: Architecture and performance

    International Nuclear Information System (INIS)

    Demand for data services operating at speeds greater than 64 kbit/s is growing. Since X.25 packet technology is inadequate to satisfy this demand, new fast packet technologies, e.g., Frame Relay and SMDS/CBDS, are being commercialized. The introduction of these fast packets requires the availability of a new generation of high throughput switching systems. This paper assesses the suitability of Delta networks to satisfy this switching requirement. The properties of these networks are reviewed and the theoretical and construction aspects of an experimental module, realized by Italtel (Italy), and which utilizes a 2.2 CSELT matrix switching element, are described. Attention is given to this module's sizing criteria and performance ratings based on test results. The module has proven to be capable of handling 90,000 frames/s with delays of the order of 1.5 ms

  3. Multimode delta-E effect magnetic field sensors with adapted electrodes

    Science.gov (United States)

    Zabel, Sebastian; Reermann, Jens; Fichtner, Simon; Kirchhof, Christine; Quandt, Eckhard; Wagner, Bernhard; Schmidt, Gerhard; Faupel, Franz

    2016-05-01

    We present an analytical and experimental study on low-noise piezoelectric thin film resonators that utilize the delta-E effect of a magnetostrictive layer to measure magnetic fields at low frequencies. Calculations from a physical model of the electromechanical resonator enable electrode designs to efficiently operate in the first and second transversal bending modes. As predicted by our calculations, the adapted electrode design improves the sensitivity by a factor of 6 and reduces the dynamic range of the sensor output by 16 dB, which significantly eases the requirements on readout electronics. Magnetic measurements show a bandwidth of 100 Hz at a noise level of about 100 pTHz-0.5.

  4. Radioactive mineral springs in Delta County, Colorado

    Science.gov (United States)

    Cadigan, Robert A.; Rosholt, John N.; Felmlee, J. Karen

    1976-01-01

    The system of springs in Delta County, Colo., contains geochemical clues to the nature and location of buried uranium-mineralized rock. The springs, which occur along the Gunnison River and a principal tributary between Delta and Paonia, are regarded as evidence of a still-functioning hydrothermal system. Associated with the springs are hydrogen sulfide and sulfur dioxide gas seeps, carbon dioxide gas-powered geysers, thick travertine deposits including radioactive travertine, and a flowing warm-water (41?C) radioactive well. Geochemical study of the springs is based on surface observations, on-site water-property measurements, and sampling of water, travertine, soft precipitates, and mud. The spring deposits are mostly carbonates, sulfates, sulfides, and chlorides that locally contain notable amounts of some elements, such as arsenic, barium, lithium, and radium. Samples from five localities have somewhat different trace element assemblages even though they are related to the same hydrothermal system. All the spring waters but one are dominated by sodium chloride or sodium bicarbonate. The exception is an acid sulfate water with a pH of 2.9, which contains high concentrations of aluminum and iron. Most of the detectable radioactivity is due to the presence of radium-226, a uranium daughter product, but at least one spring precipitate contains abundant radium-228, a thorium daughter product. The 5:1 ratio of radium-228 to radium-226 suggests the proximity of a vein-type deposit as a source for the radium. The proposed locus of a thorium-uranium mineral deposit is believed to lie in the vicinity of Paonia, Colo. Exact direction and depth are not determinable from data now available.

  5. Small-scale stratigraphy in a large ramp delta: recent and Holocene sedimentation in de the Volga delta, Caspian Sea

    NARCIS (Netherlands)

    Overeem, I.; Kroonenberg, S.B.; Veldkamp, A.; Groenesteijn, K.; Rusakov, G.V.; Svitoch, A.A.

    2003-01-01

    The Volga delta differs from all other major deltas in the world by its extremely gentle onshore and offshore gradient (similar to 5 cm/km) and by being affected by the rapid sea-level changes of the Caspian Sea, at rates up to a hundred times the global sea-level rise. This paper reports (1) the mo

  6. Colorful Yarn, Beautiful Picture——The Textile Industry in the Pearl River Delta and the Yangtze River Delta

    Institute of Scientific and Technical Information of China (English)

    Tang Jintao

    2009-01-01

    @@ At present,because of the global financial crisis,many enterprises are facing the plight of the manufacturing pressure.Especially the textile industry in the Pearl Rivher Delta and Yangtze River Delta,they are struggling for the survival through the great stress.Therefore,it is imperative to restructure and upgrade this industry.

  7. 78 FR 22911 - Delta Air Lines, Inc., Reservation Sales and Customer Care Call Center, Seatac, WA; Delta Air...

    Science.gov (United States)

    2013-04-17

    ... From the Federal Register Online via the Government Publishing Office ] DEPARTMENT OF LABOR Employment and Training Administration Delta Air Lines, Inc., Reservation Sales and Customer Care Call Center, Seatac, WA; Delta Air Lines, Inc., Reservation Sales and Customer Care Call Center, Sioux City, IA; Notice of Revised Determination...

  8. Nonperturbative renormalization of the Delta-S=1 weak Hamiltonian including the G_1 operator

    CERN Document Server

    McGlynn, Greg

    2016-01-01

    Under renormalization, physical operators can mix with operators which vanish by the equations of motion. Such operators cannot contribute to matrix elements between physical states, but they contribute to operator mixing in renormalization schemes which are defined at an off-shell momentum point, such as the popular regularization-invariant schemes. For the first time, we renormalize the lattice $\\Delta S=1$ effective weak Hamiltonian taking into account the most important such operator, $G_1 \\propto \\overline s \\gamma_\

  9. Identification, isolation, and characterization of the structural gene encoding the delta' subunit of Escherichia coli DNA polymerase III holoenzyme.

    OpenAIRE

    J.R. Carter; Franden, M A; Aebersold, R.; McHenry, C S

    1993-01-01

    The gene encoding the delta' subunit of DNA polymerase III holoenzyme, designated holB, was cloned by a strategy in which peptide sequence was used to derive a DNA hybridization probe. The gene maps to 24.95 centisomes of the chromosome. Sequencing of holB revealed a 1,002-bp open reading frame predicted to produce a 36,936-Da protein. The gene has a ribosome-binding site and promoter that are highly similar to the consensus sequences and is flanked by two potential open reading frames. Prote...

  10. Characterization and study of the behavior of wire Ti-Ni with shape memory effect enables manufacture of actuators; Estudo da caracterizacao e do comportamento de fios de Ti-Ni com efeito memoria de forma viabilizando fabricacao de atuadores

    Energy Technology Data Exchange (ETDEWEB)

    Pina, E.A.C.; Araujo Filho, O.O. de; Urtiga Filho, S.L.; Gonzalez, C.H., E-mail: kikipina@hotmail.co [Universidade Federal de Pernambuco (DEM/CTG/UFPE), Recife, PE (Brazil). Centro de Tecnologia e Geociencias. Dept. de Engenharia Mecanica

    2010-07-01

    This work aims to characterize the wire commercial Ti-Ni of 1.27 mm in diameter with shape memory effect for the development of helical springs with the function of sensor / actuator. After heat treatment, the transformation temperatures, the presence of precipitates, the degree of damping, maximum stress of rupture, modulus of elasticity, the presence of phase R, the behavior of the alloy under tension, will be analyzed and compared in each situation. For characterization we used several methods including: heat treatment, Differential Scanning Calorimetry (DSC), tensile, dynamic mechanical analysis (DMA), X-ray diffraction, thermomechanical cycling. The wires were cut into pieces and heat-treated at 400 deg C with variation of time in muffle furnaces and quenching in water at 25 deg C. (author)

  11. Synthesis and characterization of ceramics BNO (BiNbO4) added to 10% of CuO; Sintese e caracterizacao da ceramica BNO (BiNBO{sub 4}) adicionada com 10% de CuO

    Energy Technology Data Exchange (ETDEWEB)

    Sales, A.J.M.; Silva, P.M.O.; Rodrigues Junior, C.A., E-mail: jeffsales.brasil@gmail.com [Universidade Federal do Ceara (DETI/UFC), Fortaleza, CE (Brazil). Dept. de Teleinformatica; Sales, J.C.; Silva, M.A.S. da [Universidade Estadual Vale do Acarau (UVA), Sobral, CE (Brazil); Sombra, A.S.B. [Universidade Federal do Ceara (LOCEM/UFC), Fortaleza, CE (Brazil). Dept. de Fisica. Lab. de Telecomunicacoes e Ciencias e Engenharia de Materiais

    2012-07-01

    The study of the synthesis and structural characterization of ceramic BiNbO4 and behavior of density when added 10% by weight of CuO, with a view to applications in ceramic capacitors, are presented in this work. The BiNbO4 was prepared by conventional ceramic method. The milled powders were calcined for 2 hours at 850 °C for 3 hours and characterized by using a diffractometer Rigaku DMAXB of Co-α radiation. A more detailed characterization by XRD was performed using the program DBWS9807a using the Rietveld refinement of crystal structures, which confirmed the achievement of the α-BNO phase with orthorhombic structure. Were produced buks with the calcined powder, they were sintered at 925 °C. In order to study the grain morphology and distribution of pores in the ceramic body, the surface of the sample by adding 10% of CuO was analyzed by Scanning Electron Microscopy which confirmed a better densification. (author)

  12. Synthesis and characterization of rare earth molybdates nanoparticles for detection of specific prostatic cancer (PSA); Preparacao e caracterizacao de nanoparticulas de molibdatos de terras raras para deteccao do antigeno especifico da prostata (PSA)

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Clarissa Lombardi

    2013-07-01

    The interest in using rare earths to investigate the properties and functions of biochemical systems as well as to determinate biological substances has increased in several fields, including biomarkers in immunology (fluoro immunoassays). Nowadays the use of lanthanides in the diagnosis of various diseases have become more important through the development of commercial diagnostic kits. As main feature, these rare earths can show a long lifetime, photo stability and emission bands of atomic like behavior and well defined, in the visible region, demonstrating unique advantages when compared to other luminescent species. The present work had as its goal to synthesize rare earth molybdates by the co-precipitation method as well as to characterize these materials by X-ray diffraction, near infrared spectroscopy, thermogravimetric analysis, scanning electronic microscopy, transmission electronic microscopy and luminescent studies. In this work, three different studied were developed: the influence of the vortex speed variation during co-precipitation in the structure of the final product, morphology and luminescence properties; the influence of the annealing temperature also in the structure, morphology and luminescence properties; and the influence of concentration of the doping in the luminescence properties. Another important step of this work was the functionalization of nanoparticles using an organosilane (APTES) to coat and establish points for binding the particles to biological species. It was proved that this process was very efficient by the characterization results and the silica incorporation was well succeeded. Specific prostatic cancer (PSA) was then linked to the functionalized nanoparticles to diagnostic prostatic cancer by fluoroimmunoassay and levels for detection were established. (author)

  13. The geomechanical characterization of the rocky mass foundation of the Tijuco Alto hydroelectric power plant, Ribeira River, Sao Paulo/Parana States, Brazil; Caracterizacao geomecanica do Macico de Fundacao da UHE Tijuco Alto (Rio Ribeira - SP/PR)

    Energy Technology Data Exchange (ETDEWEB)

    Figueiredo, Amarilis Lucia Casteli de

    1996-07-01

    This work has as its main objective the geomechanical characterization on the future rocky mass foundation of the Tijuco Alto dam, sited at the Ribeira river, in the cities of Ribeirao, Sao Paulo state and Adrianopolis, Parana state, Brazil, owned by the Companhia Brasileira de Aluminio (Brazilian company of Aluminium). To reach that target, field studies were made to qualify the geotechnical parameters of the rocky mass, in the axis area open galleries. It was also used in situ deformability and stress test results performed in those galleries, that were reinterpreted for a better adaptation of the mass values. The knowledge of the mass inherent characteristics together with the laboratories test results, allowed for the geomechanical classification applications in several different gallery sectors. The geomechanical data obtained allowed through mathematical expressions, to reach the rocky mass values correlations of interest to the work (deformability and strength), that could be compared to the in situ test results. That analysis permitted, besides the classification critical system evaluation, the geomechanical characterization of the rocky mass, focusing its ability to the dam arch construction. (author)

  14. Technological characterization of basaltic rocks of Canoas I Hydroelectric Power Plant, Paranapanema river, Sao Paulo - Parana states, Brazil; Caracterizacao tecnologica das rochas basalticas da Usina Hidroeletrica Canoas I, Rio Paranapanema, SP/PR

    Energy Technology Data Exchange (ETDEWEB)

    Marrano, Antonio

    1997-07-01

    Basaltic litotypes from the rock mass foundation of Canoas I Hydroelectric Power Plant were submitted to technological characterization tests, in order to verify their suitability as construction material. Physical and mechanical properties (density, porosity, water absorption, ultrasonic velocity, compressive and splitting tensile strength, among others) were determined, besides petrographic analyses. Weather ability tests were also performed, not only through wetting-drying cycles and by immersion in ethylene glycol but by outdoor exposure as well, using crushed and core drilled specimens. Detailed procedures for the weather ability test using core specimens from rotary drilling are given. It is analyzed the influence of a geological feature (fault zone, about 10 meters thick and 20 degrees dip), that occurs in the rock mass foundation, on the technological properties of these rocks. Basaltic litotypes selected as construction material are then pointed out. (author)

  15. Characterization of Maytenus ilicifolia samples by {sup 1}H NMR relaxation in the solid state; Caracterizacao dos constituintes polimericos da Maytenus ilicifolia por relaxacao nuclear de {sup 1}H por RMN no estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Preto, Monica S. de M.; Tavares, Maria I.B., E-mail: mibt@ima.ufrj.br [Universidade Federal do Rio de Janeiro (IMA/UFRJ), RJ (Brazil). Inst. de Macromoleculas Professora Eloisa Mano. Lab de Ressonancia Magnetica Nuclear; Sebastiao, Pedro J.O. [Departamento de Fisica, Instituto Superior Tecnico, Lisboa (Portugal)

    2011-07-01

    The Maytenus ilicifolia (espinheira-santa) is a popular medicinal plant with different uses. It is native of South America and can be found in Brazil. In the Brazilian market it is possible found products labeled as M. ilicifolia. So far, the studies published in the literature involve the modification of the natural materials and do not concern the comparison between commercial the raw natural materials. Different non-destructive NMR techniques can be used to study natural materials. In this work it is presented a characterization study by Fast Field Cycling of the {sup 1}H spin-lattice relaxation time (T{sub 1}) NMR, in the frequency range 100 khz-10 MHz. The results obtained in two commercial M. ilicifolia samples and one control sample collected in natura are compared. It was intended to study the possibility to elaborate a characterization method using FFCNMR suitable for the verification of authenticity and/or evaluation of tampering on products. The differences detected by FFCNMR relaxometry were confirmed by thermogravimetric analysis and infrared spectroscopy. (author)

  16. Characterized and cleaning process of montmorillonite clay from Parelhas, Rio Grande do Norte state, Brazil; Caracterizacao e processo de purificacao de argila montmorilonitica da cidade de Parelhas, RN, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Melo, G.N; Costa, T.C.C; Paskocimas, C.A, E-mail: gudson.nicolau@gmail.co [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2010-07-01

    The application of montmorillonite nano composites has been improved in order to obtain dispersed phase with particles of nano metric dimensions. To obtain these nanoparticles, the clays must pass an effective purification process for removing unwanted materials, which would undermine the processes of intercalation and exfoliation of montmorillonite in a polymer matrix. This study intention to characterize and purify a montmorillonite clay from deposit recently discovered in the city of Parelhas in Rio Grande do Norte, through the separation of coarser materials by decantation followed by a chemical attack that promoted oxidation in samples where it was realized reduction of impurities such as organic matter and other substances that would hinder the achievement of nanoparticles. Under these conditions, the clay is suitable for the work as dispersed phase in a polymer matrix nano composite. The results were demonstrated by analysis of scanning electron microscopy (SEM), chemical analysis, BET and X-ray diffraction (XRD). (author)

  17. OSBRA right of way characterization in Vila Estrutural, Brasilia, Brazil; Caracterizacao de faixa do OSBRA na Vila Estrutural em Brasilia - evidencia de uma nova relacao da TRANSPETRO com a comunidade

    Energy Technology Data Exchange (ETDEWEB)

    Brito, Walderes Lima de; Castro, Newton Camelo de [TRANSPETRO - PETROBRAS Transporte S.A., Rio de Janeiro, RJ (Brazil); Braga, Gilberto Vieira [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2005-07-01

    In this project we will introduce the relationship experience between TRANSPETRO and Vila Estrutural community, located in Guara, D.C., what we consider a social responsibility practice and an important tool of the integrity maintenance of right of way pipelines, considering the risks caused by other people actions. In this specific case, Vila Estrutural is the most critical one, of Sao Paulo - Brasilia pipelines (OSBRA): irregular occupations, with an estimated population by 25,000 people, with an inhabit strangle and development constructions tendency in the straight ahead direction of pipelines. To deal with this reality, OSBRA management created a strategy called 'Acquaintance Communication', increasing the knowledge about the community (diagnostic), promoting to yours employees an acquaintance culture (qualifying); developing communications strategies with those that live nearby right of the pipelines way (relationship); and finally, building the stonemason of the characterization of the right of way pipelines as a real device and right of the way protection (framing). This work is lined up with the idea of an integrated communication, using many strategies (visits, meetings, argument groups, etc.), constituting in a corporative social responsibility practice, admitting the community right of information and knowing it the right manner of living nearby the right of way pipeline, resulting in the equipment integrity, asserting the community safety and environment maintenance. (author)

  18. Characterization of an extrapolation chamber and radiochromic films for verifying the metrological coherence among beta radiation fields; Caracterizacao de uma camara de extrapolacao e filmes radiocromicos para verificacao da coerencia metrologica entre campos padroes de radiacao beta

    Energy Technology Data Exchange (ETDEWEB)

    Castillo, Jhonny Antonio Benavente

    2011-07-01

    The metrological coherence among standard systems is a requirement for assuring the reliability of dosimetric quantities measurements in ionizing radiation field. Scientific and technologic improvements happened in beta radiation metrology with the installment of the new beta secondary standard BSS2 in Brazil and with the adoption of the internationally recommended beta reference radiations. The Dosimeter Calibration Laboratory of the Development Center for Nuclear Technology (LCD/CDTN), in Belo Horizonte, implemented the BSS2 and methodologies are investigated for characterizing the beta radiation fields by determining the field homogeneity, the accuracy and uncertainties in the absorbed dose in air measurements. In this work, a methodology to be used for verifying the metrological coherence among beta radiation fields in standard systems was investigated; an extrapolation chamber and radiochromic films were used and measurements were done in terms of absorbed dose in air. The reliability of both the extrapolation chamber and the radiochromic film was confirmed and their calibrations were done in the LCD/CDTN in {sup 90}Sr/{sup 90}Y, {sup 85}Kr and {sup 147}Pm beta radiation fields. The angular coefficients of the extrapolation curves were determined with the chamber; the field mapping and homogeneity were obtained from dose profiles and isodose with the radiochromic films. A preliminary comparison between the LCD/CDTN and the Instrument Calibration Laboratory of the Nuclear and Energy Research Institute / Sao Paulo (LCI/IPEN) was carried out. Results with the extrapolation chamber measurements showed in terms of absorbed dose in air rates showed differences between both laboratories up to de -I % e 3%, for {sup 90}Sr/{sup 90}Y, {sup 85}Kr and {sup 147}Pm beta radiation fields, respectively. Results with the EBT radiochromic films for 0.1, 0.3 and 0.15 Gy absorbed dose in air, for the same beta radiation fields, showed differences up to 3%, -9% and -53%. The beta radiation field mappings with radiochromic films in both BSS2 showed that some of them were not geometrically aligned. (author)

  19. Synthesis and characterization of ZSM-5 and calcined kaolin evaluation using the content of structure-directing; Sintese e caracterizacao da zeolita ZSM-5 utilizando caulim calcinado e avaliacao do teor de direcionador de estrutura

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, J.J.; Silva, V.J. da; Rodrigues, M.G.F., E-mail: jocielys@yahoo.com.br [Universidade Federal de Campina Grande (LABNOV/UAEQ/UFCG), PB (Brazil). Unidade Academica de Engenharia Quimica. Lab. de Desenvolvimento de Novos Materiais

    2012-07-01

    This study aims to evaluate the effect of the structure-directing content, tetrapropylammonium bromide, on the structural and morphological characteristics of ZSM-5 zeolite obtained using calcined kaolin as silicon and aluminum. The samples were characterized by XRD, EDX, SEM and Physics Adsorption N{sub 2}. Trough X ray diffraction patterns was possible to observed the formation of the structure of ZSM-5 with intense peaks and well-defined characteristic of crystalline. The micrographs showed that the samples consist of agglomerates and/or aggregates of particles characteristic of the MFI structure typical of ZSM-5 zeolite. And through the adsorption-desorption isotherms physical N2 was possible to observe that the samples show hysteresis type I typical of microporous materials with specific surface areas of 218 and 222 m{sup 2}/g. Therefore, the use of calcined kaolin to obtain ZSM-5 zeolite was effective. (author)

  20. Evaluating factorial kriging for seismic attributes filtering: a geostatistical filter applied to reservoir characterization; Avaliacao da krigagem fatorial na filtragem de atributos sismicos: um filtro geoestatistico aplicado a caracterizacao de reservatorios

    Energy Technology Data Exchange (ETDEWEB)

    Mundim, Evaldo Cesario

    1999-02-01

    In this dissertation the Factorial Kriging analysis for the filtering of seismic attributes applied to reservoir characterization is considered. Factorial Kriging works in the spatial, domain in a similar way to the Spectral Analysis in the frequency domain. The incorporation of filtered attributes via External Drift Kriging and Collocated Cokriging in the estimate of reservoir characterization is discussed. Its relevance for the reservoir porous volume calculation is also evaluated based on comparative analysis of the volume risk curves derived from stochastic conditional simulations with collocated variable and stochastic conditional simulations with collocated variable and stochastic conditional simulations with external drift. results prove Factorial Kriging as an efficient technique for the filtering of seismic attributes images, of which geologic features are enhanced. The attribute filtering improves the correlation between the attributes and the well data and the estimates of the reservoir properties. The differences between the estimates obtained by External Drift Kriging and Collocated Cokriging are also reduced. (author)

  1. Chemical and physicochemical characterization of vermicompost from bovine manure and evaluation of competitive adsorption of cadmium and lead; Caracterizacao quimica e fisico-quimica de vermicomposto de esterco bovino e avaliacao da adsorcao competitiva por cadmio e chumbo

    Energy Technology Data Exchange (ETDEWEB)

    Lamim, Soraida Sozzi Miguel [Juiz de Fora Univ., MG (Brazil). Dept. de Quimica; Jordao, Claudio Pereira; Brune, Walter; Pereira, Jose Luis [Vicosa Univ., MG (Brazil). Dept. de Quimica

    1996-09-01

    The chemical and physicochemical characterization of vermicompost from bovine manure has been studied. It was examined the pH and cation exchangeable capacity (CTC), moistness, ash, organic carbon, total nitrogen, lignin, cellulose and metal concentrations, among other characteristics. The vermicompost was then applied to the retention and competition of metal pollutants (Cd and Pb) from metal nitrate solutions. The retention was affected by both the pH and time of adsorption, while the competitive character of these metals for the substrate was not relevant to each pH examined. (author) 46 refs., 4 figs., 7 tabs.

  2. Characterization of jade and silicates of the jade family for application in radiation dosimetry; Caracterizacao do jade e dos silicatos da familia do jade para aplicacao em dosimetria das radiacoes

    Energy Technology Data Exchange (ETDEWEB)

    Melo, Adeilson Pessoa de

    2007-07-01

    The main dosimetric properties of jade and of Brazilian silicates of the jade family were studied for application in radiation dosimetry of high doses. Jade is a common denomination of two different silicates: jadeite, Na Al(Si{sub 2}O{sub 6}), and nephrite, Ca{sub 2}(Mg, Fe){sub 5}(Si{sub 4}O{sub 11}){sub 2} (OH){sub 2}, that belong to the subclasses of the pyroxenes and amphiboles respectively. The jade samples studied in this work were from: Austria, New Zealand, United States and Brazil. The Brazilian silicates of the jade family studied in this work were the amphiboles: tremolite,Ca{sub 2}Mg{sub 5}(Si{sub 4}O{sub 11}){sub 2}(OH){sub 2} e actinolite, Ca{sub 2}Fe{sub 5}(Si{sub 4}O{sub 11}){sub 2}(OH){sub 2}; and the pyroxenes: rhodonite, MnSiO{sub 3} and diopside, Ca Mg(Si{sub 2}O{sub 6}). The mineralogical and chemical composition of these materials were obtained using the neutron activation analysis and X-ray diffraction techniques. The main dosimetric properties (emission curves, calibration curves, reproducibility, lower detection limits, angular and energy dependence, etc) were studied using the thermoluminescent (T L), thermally stimulated exo-emission (TSEE) and electronic paramagnetic resonance (EPR) techniques. The jade-Teflon and the silicate-Teflon samples present two T L peaks around 115 deg C (peak 1) and 210 deg C (peak 2). The calibration curves of the studied materials present a linear behaviour between 0.5 Gy and 1 kGy. The TSEE emission peak occurs at 240 deg C for all samples, and the calibration curves present a sub linear behaviour between 100 Gy and 20 kGy. In the case of the EPR technique, only jade USA has a potential application for radiation dosimetry. A static computational simulation of the most probable intrinsic and extrinsic defects in rhodonite was also realized. Among the basic defects, the Schottky defects of rhodonite are the most probable to occur and, among the extrinsic defects, the divalent and trivalent dopants present the best possibility of inclusion in rhodonite. (author)

  3. Microstructural characterization of porous materials by X-ray microtomography and gamma ray transmission techniques; Caracterizacao da microestrutura de materiais porosos por microtomografia de raios X e transmissao de raios gama

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Anderson Camargo

    2006-07-01

    This work presents the application of the X-ray microtomography and gamma ray transmission techniques for the microstructure characterization of different kinds of materials. Total porosity, pore size distribution and the two point correlation functions were measured. The two point correlation function, which allows the reconstruction of 3D models, was carried out for two samples. Seven ceramic tablets of Alumina (Al{sub 2}O{sub 3}), seven tablets of Boron Carbide (B{sub 4}C), three samples of sedimentary rocks and one sample of Titanium foam were analyzed. The experimental set up for the Gamma Ray Transmission technique consisted of: a 2'' x 2'' crystal NaI(Tl) detector, an {sup 241} Am radioactive source (59,53 keV, 100 mCi), an automatic micrometric table for the sample XZ movement and standard gamma spectrometry electronics. Two microtomography systems were used: a Fein Focus system, constituted by an X-ray tube, operated at 160 kV and 0.3 to 1.1 mA, a CCD camera and the movement sample system, and a Skyscan system, model 1072, with a X-ray tube operated at 100 kV and 100{mu}A, and a CCD camera. The ceramic tablets, analyzed by the gamma ray transmission technique presented results for most of the porosities data with smaller confidence intervals and inside the intervals supplied by the tablets manufacturer. The Titanium porous sample was analyzed by the two techniques, its microtomography images achieved a resolution of 17{mu}m, obtained employing the Fein Focus system. For both techniques, this sample showed high porosity, which allows its application for this purpose. The sandstones samples were analyzed by the Skyscan system, achieving resolutions of 19{mu}m, 11{mu}m and 3.8{mu}m for each sample, respectively. The resolutions of 11{mu}m and 3.8{mu}m were the ones that generated better 2D sections for the respective samples and, consequently, more reliable porosities. The 3.8{mu}m resolution was the one that best quantified the pore size distribution data, showing information not shown by the 11{mu}m resolution, showing that pores with 15 to 45{mu}m radius are predominant, constituting 57% of the porous phase of this sample, and 1 % are just constituted by pores with radius up to 3.8{mu}m. These results show that resolution better than 3.8{mu}m could be necessary only for specific cases. (author)

  4. Preliminary characterization of the rare earth ore from the Barra do Itapirapua, Sao Paulo and Parana states, Brazil. Detail 1 area; Caracterizacao preliminar do minerio de terras raras da Barra do Itapirapua, SP/PR - area de detalhe 1

    Energy Technology Data Exchange (ETDEWEB)

    Lorenzi, M.L.B.; Lorenzi, V.E.; Kahn, H

    1996-12-31

    The main rare earth mineralization on Barra do Itapirapua Alkaline-Carbonatitic Complex is related to the weathering mantle of the Serrana Body carbonatite plug - detail 1 area. The present work describes the preliminary RE ore types established from correlation between geological observations, geochemical weathering profile and mineralogical studies. Mineralogical studies, comprising around 40 thin section analysis, were performed by scanning electron microscopy (SEM) with energy dispersive systems (EDS). (author) 5 refs., 2 figs., 1 tab.

  5. Synthesis and characterization of polyurethanes derived from cyclodextrins and poli (ethyleneglycol); Sintese, caracterizacao e avaliacao da capacidade de inclusao de poliuretanos derivados de cicodextrina e poli(etileno)glicol

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Marcia V.G. de; Vieira, Joao V.F.; Zawadzki, Sonia F., E-mail: zawadzki@ufpr.br [Universidade Federal do Parana - UFPR, Dept. de Quimica, Lab. de Polimeros Sinteticos (LABPOL), Curitiba, PR (Brazil)

    2011-07-01

    Cyclodextrins are natural cyclic oligosaccharides that have the ability to form inclusion complexes with various chemical species. In this work, the polymers with beta-cyclodextrin (BCD) or hydroxypropyl-beta-cyclodextrin (HPBCD) were synthesized from the reaction with poly (ethylene) glycol (PEG400, PEG1500, PEG4000) and diisocyanate, toluene 2,4 and 3,6 (TDI) in a solution of dimethylformamide (DMF). The polymers were characterized by infrared Fourier transform spectroscopy (FTIR), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). The encapsulation capacity was evaluated by calorimetric method of discoloration of the alkaline solution of phenolphthalein. FTIR analysis revealed that assignments confirmed the formation of urethane linkages. TGA was evidenced by the mass loss in three stages and the evaluation results by XRD showed a crosslinking process. The evaluation of the encapsulation capacity of the units of the cyclodextrin crosslinked polymer showed that encapsulation increased proportionally to the mass of polymer used. (author)

  6. Dating and characterization of archaeological ceramics of the Araruama area at Rio de Janeiro, Brazil; Datacao e caracterizacao de ceramicas arqueologicas da regiao de Araruama no Estado do Rio de Janeiro

    Energy Technology Data Exchange (ETDEWEB)

    Vinagre Filho, Ubirajara M. [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil); Bellido, Alfredo V.B.; Latini, Rose M. [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. de Quimica; Buarque, Angela [Museu Nacional, Rio de Janeiro, RJ (Brazil); Rossi, Alexandre M. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

    2000-07-01

    Ceramic of three archaeological sites (Serrano, Morro Grande, and condominium Bela Vista) of the Araruama area (Rio de Janeiro/Brazil), are being dated by the thermoluminescence technique. These ceramics are being characterized, in your elementary chemical composition, by INAA. Preliminary results are presented and the samples treatment method is described. (author)

  7. Chemometrics application in fuel's MTR type chemical characterization by X-ray fluorescence; Aplicacao da quimiometria para caracterizacao quimica de combustiveis tipo MTR por fluorescencia de raios-X

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Clayton Pereira da

    2012-07-01

    In Brazil and worldwide the nuclear power has occupied a prominent position with many applications in industry, power generation, environment and medicine, improving the quality of tests and treatments, therefore people's lives. Uranium is the main element used in nuclear facilities and it s employed as base material to generation of electricity in the manufacture of radiopharmaceuticals. In the '50s, during the Cold War, the then newly created International Atomic Energy Agency proposed to oversee nuclear facilities and encourage the manufacture of nuclear fuels with low-enriched uranium (LEU) fuel came then type Material Test Reactor (MTR), manufactured initially in U{sub 3}O{sub 8} and U{sub 3}Si{sub 2} later, both dispersed in aluminum. The use of this technology requires a constant improvement of all processes involving the manufacture of MTR subject to several international protocols, which seek to ensure the reliability of the fuel from the standpoint of practical and environmental. In this context, the control of impurities, from the point of view of neutron economy, directly affects the quality of any nuclear fuel, so strict control is necessary. The literature has reported procedures which, beyond generating residues, are lengthy and costly, they need calibration curve and consequently reference materials. The aim of this work is to establish and validate a methodology for nondestructive quantitative chemical analysis, low cost and analysis time, as well as minimize the generation of waste, for multielement determination of major constituents (Utotal and Si) and impurities (B, Mg, Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Cd and others) present in U3O8 and U{sub 3}Si{sub 2}, meeting the needs of nuclear reactors in the nuclear fuel qualification type MTR. For that purposes, will be applied the X-ray fluorescence technique which allows fast chemical and nondestructive analysis, aside from sample preparation procedures that do not require previous chemical treatments (dissolving, digesting, and others). To corrections like effects of spectral and matrix were applied and evaluated the fundamental parameter method, univariate calibration curve and multivariate calibration. The results were compared by means of statistical tests in accordance with ISO 17025 in MRCs (123 (1-7) and 124 (1-7)) MCRs of U{sub 3}O{sub 8} from New Brunswick Laboratory (NBL) and 16 U{sub 3}Si{sub 2} samples provided by CC of IPEN/CNEN-SP. The chemometrics is a promising method to determination of minor and major constituents on the U3Si2 and U3O8 basis nuclear fuel, because the precision and accuracy are statistically equal volumetric analysis, gravimetric and ICPOES methods. (author)

  8. Synthesis and characterization of chitosan-graft-poly(acrylic acid)/rice husk ash hydrogels composites; Sintese e caracterizacao de hidrogeis compositos de cinza da casca de arroz e quitosana enxertada com poli(acido acrilico)

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Francisco H.A. [Universidade Estadual Vale do Acarau - UVA, Sobral, CE (Brazil); Lopes, Gabriel V.; Pereira, Antonio G.B.; Fajardo, Andre R.; Muniz, Edvani C. [Universidade Estadual de Maringa - UEM, PR (Brazil)

    2011-07-01

    According to environmental concerns, super absorbent hydrogel composites were synthesized based on rice husk ash (RHA), an industrial waste, and Chitosan-graft-poly(acrylic acid). The WAXS and FTIR data confirmed the syntheses of hydrogel composites. The effect of crystalline or amorphous RHA on water uptake was investigated. It was found that the RHA in crystalline form induces higher water capacity (W{sub eq}) of composites hydrogels due to the fact that the intra-interactions among silanol groups on RHA make available new sites in the polymer matrix, which could interact to water. (author)

  9. Preparation and characterization of high density polyethylene and residual fibre of Attalea funifera Mart (piacava) composites; Preparacao e caracterizacao de compositos de polietileno de alta densidade com residuos de fibras de piacava da especie Attalea funifera Mart

    Energy Technology Data Exchange (ETDEWEB)

    Agrela, Sara P.; Guimaraes, Danilo H.; Jose, Nadia M., E-mail: saraagrela@hotmail.co [Universidade Federal da Bahia (GECIM/IQ/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais; Carvalho, Gleidson G.P. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola de Medicina Veterinaria. Dept. de Producao Animal; Carvalho, Ricardo F. [Universidade Federal da Bahia (EP/UFBA), Salvador, BA (Brazil). Escola Politecnica. Curso de Mestrado em Engenharia Ambiental Urbana

    2009-07-01

    The use of natural fiber reinforcement thermoplastic polymer is continuously increasing. This fact is manly due to its advantages as low cost, availability, recyclability, low energy demand and then environmental appeal if compared to synthetics fibers. The composites were prepared in different fiber volume ratios (5%, 10% and 20%) mixed with high density polyethylene (HDPE) and heated at 190 deg C. Thermogravimetric analysis and differential scanning calorimetry were used to investigate thermal stability. The composites structure was characterized by Fourier Transform Infrared spectroscopy, X-ray diffractometry. Fiber and residue of piassava (Attalea funifera Mart) chemical composition were determined by Van Soest Method. The results indicate that thermo stability of the composites of HDPE prepared with fiber volume ratios up to 20% is only slightly lowered. (author)

  10. Synthesis and characterization of pigments of hematite, obtained through a by-product of the siderurgy industry; Sintese e caracterizacao de pigmento de hematita, obtido atraves de um subproduto da industria siderurgica

    Energy Technology Data Exchange (ETDEWEB)

    Prim, S.R.; Folgueiras, M.V.; Lima, M.A. de, E-mail: dem6srp@joinville.udesc.b [Universidade Estadual de Santa Catarina (PGCEM/UDESC), Joinville, SC (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais

    2009-07-01

    In the ceramic industry of tooting, whose selection is strongly influenced by the visual aspect of the decorated surface, the color becomes one of the most important characteristic for the too tings. With the purpose of seeking new pigments that replace or optimize the already known, news method to synthesis are being researched, such as new pigments system and also the incorporation of new raw materials. In this form, in the present work search to study the possibility of use of a by-product deriving from of the siderurgical industry, that introduces high grades of the Fe{sub 2}O{sub 3}. For that different contests of the residue were added in one matrix of silica in the hape of quartz, and homogenized using conventional milling and high energy milling. The material obtained after heating treatment in temperature that varied between 1050 and 1300 deg C was characterization by x-ray diffractometry, differential thermal analysis and scanning electron microscopy. The results shown the feasibility of the process depend of the control of the variables temperature and condition of milling in the quality of material obtained. (author)

  11. Study of ceramics from circular archaeological sites of Amazonic Basin by geochemical methods: dating and characterization; Estudo de ceramicas de sitios arqueologicos circulares da Bacia Amazonica por meio de metodos geoquimicos: datacao e caracterizacao

    Energy Technology Data Exchange (ETDEWEB)

    Nicoli, Ieda Gomes

    2000-09-01

    The aim of this work is to examine by means of characterization and dating pottery recently discovery inside archaeological sites recognized with circular earth structure in Acre State - Brazil which may contribute to the research in the reconstruction of part of the pre-history of the Amazonic Basin. These sites are located mainly in the Hydrographic Basin of High Purus River. Three of them were strategic chosen which provide the ceramics: Lobao, in Sena Madureira County at north; Alto Alegre, in Rio Branco County at east and Xipamanu I, in Xapuri County at south. The X-ray diffraction mineral analysis made possible to identify two types of crystal structures of ceramic minerals: quartz and M-Kaolinite. Neutron activation analysis in conjunction with multivariate statistical methods were applied for the ceramic characterization and classification. An homogeneous group was established by all sherds collected from Alto Alegre and was distinct from all the other two groups analyzed. Some of the sherds collected from Xipamanu I appeared in Lobao's urns, probably because they had the same fabrication process. The Lobao's urns presented a homogeneous group. Geochronology of these materials was carried out by Thermoluminescence. The Xipamanu I was the oldest site and Lobao the youngest. The average age of Xipamanu I and Alto Alegre were 2600 and 2070 years respectively. The average age of of occupation was 400 years to Alto Alegre and 970 years to Xipamanu I. The most probably date for Lobao was 1880 years. (author)

  12. Characterization of manganese phases in mineral processing products of the Azul Mine, Carajas. Metallurgical implications; Caracterizacao de fases manganesiferas em produtos de beneficiamento da Mina do Azul, Carajas. Implicacoes metalurgicas

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, G.; Fernandez, O.J.Ch., E-mail: pereiragilcimar@hotmail.co, E-mail: ochoque.fernandez@gmail.co [Instituto Federal de Ciencia e Tecnologia do Para (IFPA), Belem, PA (Brazil). Curso de Engenharia de Materiais; Costa, M.L. da, E-mail: mlc@ufpa.b [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Inst. de Geociencias

    2010-07-01

    Were characterized the manganese phases of the processing products using ore microscopy and x-ray diffraction, in order to contribute with new data and help the processing operations of the mine. Cryptomelane is the main manganese mineral in products, and pyrolusite and nsutite are in minor proportion. Were observed distinctive textures of the cryptomelane and others manganese phases, it were formed in different geological times and therefore affecting the operations in mineral processing, principally, comminution. The observed mineralogical variations affect too the unit operations when expand the pit. (author)

  13. The role of inversion for acoustic impedance in the seismic characterization process of reservoirs; O papel da inversao para a impedancia acustica no processo de caracterizacao sismica de reservatorios

    Energy Technology Data Exchange (ETDEWEB)

    Sancevero, Sergio Sacani; Remacre, Armando Zaupa; Portugal, Rodrigo de Souza [Dept. de Geologia e Recursos Naturais (DGRN), Inst. de Geociencias, Universidade Estadual de Campinas (UNICAMP), SP (Brazil)], E-mails: sacani@ige.unicamp.br, armando@ige.unicamp.br, portugal@ige.unicamp.br

    2006-10-15

    The reservoir characterization process can be defined as the three-dimensional and quantitative determination of structure and petrophysical properties of the oil field. The use of 3D seismic data in the reservoir characterization process has become more frequent mainly in the identification of the shape and the size of the sand bodies that constitute the reservoir. However, in some situations as the deep water turbidity reservoirs of Campos Basin, that are characterized by a complex distribution of sand bodies and sub seismic thickness, the use of the conventional seismic amplitude data can result in serious mistakes in the definition of reservoir model. To solve the problem of the vertical seismic resolution limitation, is necessary to build an integrated model that use all information available about the reservoir. The most effective way to integrate the seismic data in the reservoir characterization process is by using acoustic impedance models, obtained by seismic inversion. The aim of this work is to show how the seismic inversion to acoustic impedance can support and improve the characterization of the reservoirs, when comparing the results obtained by the application of two seismic inversion methods, the recursive inversion and the constrained sparse-spike inversion. The seismic inversion methods are applied in a wedge synthetic reference model, that represent some features find in the deep water turbidity reservoir, like stratigraphic thinning and pinch-outs. Based on these results we can see the advantages in use the seismic inversion methods in the determination of geometry of sand bodies and in the calculation of petrophysical properties, and as a consequence more accuracy models can be generated and the forecasts about the behavior of the field can be done in most effective way. (author)

  14. 3D geostatistic modelling of the acoustic impedance for the characterization of Namorado oil field, Brazil; Modelagem geoestatistica 3D da impedancia acustica para a caracterizacao do Campo de Namorado

    Energy Technology Data Exchange (ETDEWEB)

    Vidal, Alexandre Campane; Sancevero, Sergio Sacani; Remacre, Armando Zaupa; Costanzo, Caetano Pontes [UNICAMP, Instituto de Geociencias, Dept. de Geologia e Recursos Naturais, Campinas, SP (Brazil)], E-mails: vidal@ige.unicamp.br, sacani@ige.unicamp.br, geden@ige.unicamp.br, caetano.costanzo@gmail.com

    2007-07-15

    The aim of this work is analyze the vertical seismic resolution of the turbidity reservoir of Namorado Field. In this work the seismic modeling was accomplished using the convolution method. The wavelet used was the Ricker type with dominant frequency of 20 hz, 35 hz and 50 hz. The results show that wavelet with frequencies of 35 hz and 50 hz have better seismic resolution than wavelets of 20 hz, however all frequencies delimit top and base of the reservoir. From the acoustic impedance model, obtained from the synthetic seismogram, was possible, knowing the correlation of this variable with reservoir rocks, determine the distribution of reservoir facies. For that was used the geostatistical analysis that still enabled the studies regarding to the scenarios analysis by means of the application of stochastic methods. (author)

  15. Impregnation of 12-tungstophosphoric acid on silica - part I: determination of impregnation parameters, characterization and evaluation of catalytic activity; Impregnacao do acido 12-fosfotungstico em silica - parte I: determinacao de parametros de impregnacao, caracterizacao e avaliacao da atividade catalitica

    Energy Technology Data Exchange (ETDEWEB)

    Scroccaro, Karine Isabel; Tanobe, Valcineide Oliveira de Andrade; Cocco, Lilian Cristina; Yamamoto, Carlos Itsuo, E-mail: karineisabel@yahoo.com.br [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Engenharia Quimica; Wypych, Fernando [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Quimica

    2012-07-01

    Catalyst based on Kegging-type heteropolyacids (H{sub 3}PW{sub 12}O{sub 40} - HPA), supported on SiO{sub 2} (H{sub 3}PW), were prepared by the impregnation method under different thermal treatment conditions. The materials were characterized by different instrumental techniques and used as catalysts in the methyl esterification reactions of stearic acid. Using the catalyst with 15% of HPA, conversions higher than 60% were obtained after 2 h of reaction at 65 deg C. Recovery studies using hot-filtration with ethanol at 75 deg C showed satisfactory activity for two additional reaction cycles. (author)

  16. Chemical-mineralogical characterization and Moessbauer spectroscopy of aquamarine from Pedra Azul, Northeast of Minas Gerais; Caracterizacao quimico-mineralogica e espectroscopia Moessbauer de agua-marinha da regiao de Pedra Azul, nordeste de Minas Gerais

    Energy Technology Data Exchange (ETDEWEB)

    Viana, Rubia Ribeiro; Jordt-Evangelista, Hanna [Ouro Preto Univ., MG (Brazil). Escola de Minas. Dept. de Geologia]. E-mail: rubia@degeo.ufop.br; hanna@degeo.ufop.br; Costa, Geraldo Magela da [Ouro Preto Univ., MG (Brazil). Dept. de Quimica]. E-mail: magela@iceb.ufop.br

    2001-03-01

    Aquamarines from three pegmatites located the vicinities of the Pedra Azul city, Minas Gerais state, were investigated in terms of chemical composition, physical properties and Moessbauer spectroscopy. The small lenticular pegmatite bodies are usually less than 5 m wide and exhibit a conspicuous mineralogical and textural zoning. The last thermal event in these pegmatites, determined by K-Ar method in muscovite, is of Neo proterozoic age, coincident with the late stages of the Brasiliano tectono- metamorphic cycle. Chemical analyses showed that sodium is the alkali with higher contents in the aquamarines, thus enabling their classification as sodic beryls. In zoned samples there is an increase of Fe as well as Mn from center to border, while no systematic variation could be detected for other elements. The specific gravity of 2.72 to 2.80 g/cm{sup 3} is higher than the values determined for samples from other pegmatites of Minas Gerais. The refraction indices are ne=1.569 - 1.579 and NW= 1.573 - 1.581 and the birefringence varies from 0.002 to 0.008. The refraction indices increase with the Be O content. The color of aquamarines varies from medium to light blue, sometimes greenish blue. Moessbauer spectra obtained at room temperature and at 80 K show that Fe{sup 2+} is the main chromophore-ion and suggest that the iron is present in octahedral sites as well as in the structural channels. Moessbauer spectra also indicate that the incorporation of Fe{sup 3+} may cause a shift from deep blue to light blue colors. Based on their aquamarine composition the pegmatites were classified as barren, poor in rare alkalis (Li, Rb, Cs) and therefore little differentiated. The relatively simple mineralogy and the lack of lithium minerals such as lepidolite and spodumene confirm this classification. Thus, the composition of beryl can be used as a tracer for the prospection of pegmatites with different degrees of differentiation and consequently with different types of mineralization. (author)

  17. Characterization of isolated biomass of the fermentation processes for ethanol production for use as biofuels; Caracterizacao da biomassa isolada de processos fermentativos de producao de etanol para uso como biocombustiveis

    Energy Technology Data Exchange (ETDEWEB)

    Steckelberg, Claudia; Andrietta, Maria da Graca Stupiello; Andrietta, Silvio Roberto [Universidade Estadual de Campinas (CPQBA/UNICAMP), SP (Brazil). Centro Pluridisciplinar de Pesquisas Quimicas, Biologicas e Agricolas. Div. de Biotecnologia e Processos], Email: claudia@cpqba.unicamp.br

    2006-07-01

    This study has had the purpose of enhancing the knowledge on the dominant strains of ethanol fermentation process biomass to use as bio fuel. The attributes studied were: numerical taxonomy (Griffits, 1981) and fermentative performance. The results have showed that all strains have presented good fermentative characteristics. All strains have been classified as Saccharomyces. In this genus were found the follow species: chevalieri, coreanus cerevisiae. If the classification according Barnet (1992) is considered, all of them are representative of S. cerevisiae. (author)

  18. Quantitative characterization of the sequential mers distribution in styrene-butadiene copolymers by {sup 13} C; Caracterizacao quantitativa da distribuicao sequencial dos meros em copolimeros de estireno e butadieno por RMN de {sup 13} C

    Energy Technology Data Exchange (ETDEWEB)

    Canevarolo, Sebastiao [Sao Carlos Univ., SP (Brazil). Dept. de Engenharia de Materiais

    1996-06-01

    Various types and grades of styrene-butadiene co-polymers were analysed by {sup 13} C-NMR: random SBR, blocked SSBR (a styrene block is introduced in the random SBR chain) and SBS triblock copolymers. It was determined the styrene content (%), the styrene-butadiene mers distribution in terms of the S-B and B-S-B sequences content (characteristics of the random portions of the chain) and also the isomers content in the butadiene phase. (author)

  19. Synthesis, characterization and study of activity inhibitory of new dialkylphosphorylhdrazones on the growth of trypanosomatids; Sintese, caracterizacao e estudo da atividade inibitoria de novas dialquilfosforilarilidrazonas sobre o crescimento de tripanossomatideos

    Energy Technology Data Exchange (ETDEWEB)

    Nogueira, Andrea Janaina M.; Lima, Marco Edilson F. de; DaCosta, Joao Batista N., E-mail: dacosta@ufrrj.br [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil). Inst. de Ciencias Exatas. Dept. de Quimica; Alves, Eliomara Sousa Sobral; Anjos, Danielle Oliveira dos; Vannier-Santos, Marcos Andre; Lanfredi-Rangel, Adriana [Fundacao Oswaldo Cruz, Salvador, BA (Brazil). Centro de Pesquisas Goncalo Moniz

    2011-07-01

    A new series of dialkylphosphorylhydrazones was synthesized through the condensation of aromatic aldehydes with different phosphorylhydrazines. All synthesized compounds were characterized by IR, {sup 1}H-NMR, {sup 13}C-NMR and {sup 31}P-NMR spectroscopies. The in vitro investigation of the activity of these compounds against Leishmania amazonensis promastigotes and epimastigotes of T. cruzi, showed an efficient inhibition of proliferation, at non toxic concentrations to mammalian cells. The results have shown some derivatives as potential antiparasitic agents against trypanosomatids. (author)

  20. Characterization of barite and crystal glass as attenuators in X-ray and gamma radiation shieldings; Caracterizacao da barita e do vidro cristal como atenuadores na blindagem das radiacoes X e gama

    Energy Technology Data Exchange (ETDEWEB)

    Almeida Junior, Airton Tavares de

    2005-03-15

    Aiming to determine the barium sulphate (BaSO{sub 4}) ore and crystal glass attenuation features, both utilized as shieldings against ionizing X and gamma radiations in radiographic installations, a study of attenuation using barite plaster and barite concrete was carried out, which are used, respectively, on wall coverings and in block buildings. The crystal glass is utilized in screens and in windows. To do so, ten plates of barite plaster and three of barite concrete with 900 cm{sup 2} and with an average thickness ranging from 1 to 5 cm, and three plates of crystal glass with 323 cm{sup 2} and with thicknesses of 1, 2 and 4 cm were analyzed. The samples were irradiated with X-rays with potentials of 60, 80, 110 and 150 kilovolts, and also with {sup 60}Co gamma rays. Curves of attenuation were obtained for barite plaster and barite concrete (mGy/mA.min) and (mGy/h), both at 1 meter, as a function of thickness and curve of transmission through barite plaster and barite concrete as a function of the thickness. The equivalent thicknesses of half and tenth value layers for barite plaster, barite concrete and crystal glass for all X-Ray energies were also determined. (author)

  1. Monitoring and characterization of organic reactive species in the atmosphere: a tool for management of air quality; Monitoramento e caracterizacao de especies organicas reativas na atmosfera: uma ferramenta para gestao da qualidade do ar

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Andrea; Almeida, Jose Claudino; Loureiro, Luciana [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES). Monitoramento Atmosferico; Moreira, Lino [TRANSPETRO, Rio de Janeiro, RJ (Brazil); Grosjean, Daniel; Grosjean, Eric [DGA Inc., Ventura, CA (United States)

    2004-07-01

    The present paper briefly reports some monitoring campaigns carried out in Rio de Janeiro Metropolitan Area through 1999 a 2001, and presents some benchmarking with the study that took place in Porto Alegre from 1996 a 1999. These studies were developed through CENPES research projects, with partnership with local academy, international consultants, local environmental agencies and the environmental secretaries from the two cities. The main goal of both studies was to speciate and characterize the Volatile Organic Compounds (VOC's) present in the urban environments of both locations in order to assess the overall atmospheric reactivity and the ozone production potentials. Highest priority was given to the locations in which vehicular emissions played important role, once the core objective of both projects was to supply technical information on the atmospheric impact of motor fuels, with special emphasis on gasoline. With the continuation of Rio de Janeiro monitoring campaigns and the inclusion of Sao Paulo in the project as an additional monitoring area, the intention is to grant enough technical input and information to establish a data bank of ambient air concentrations of speciated reactive VOC's, fully customized to the Brazilian urban scenario, aiming to go farther in the realm of atmospheric chemistry and atmospheric reactivity. In essence, the effort devoted to raise local and experimental information on air quality and vehicle emissions aims to build sound scientific basis to technically support environmental management policies of best cost-effectiveness targeting secondary pollutants control in the urban atmospheres (author)

  2. Potential exposure of larval and juvenile delta smelt to dissolved pesticides in the Sacramento-San Joaquin Delta, California

    Science.gov (United States)

    Kuivila, K.M.; Moon, G.E.

    2004-01-01

    The San Francisco Estuary is critical habitat for delta smelt Hypomesus transpacificus, a fish whose abundance has declined greatly since 1983 and is now listed as threatened. In addition, the estuary receives drainage from the Central Valley, an urban and agricultural region with intense and diverse pesticide usage. One possible factor of the delta smelt population decline is pesticide toxicity during vulnerable larval and juvenile stages, but pesticide concentrations are not well characterized in delta smelt spawning and nursery habitat. The objective of this study was to estimate the potential exposure of delta smelt during their early life stages to dissolved pesticides. For 3 years (1998-2000), water samples from the Sacramento-San Joaquin Delta were collected during April-June in coordination with the California Department of Fish and Game's delta smelt early life stage monitoring program. Samples were analyzed for pesticides using solid-phase extraction and gas chromatography/mass spectrometry. Water samples contained multiple pesticides, ranging from 2 to 14 pesticides in each sample. In both 1999 and 2000, elevated concentrations of pesticides overlapped in time and space with peak densities of larval and juvenile delta smelt. In contrast, high spring outflows in 1998 transported delta smelt away from the pesticide sampling sites so that exposure could not be estimated. During 2 years, larval and juvenile delta smelt were potentially exposed to a complex mixture of pesticides for a minimum of 2-3 weeks. Although the measured concentrations were well below short-term (96-h) LC50 values for individual pesticides, the combination of multiple pesticides and lengthy exposure duration could potentially have lethal or sublethal effects on delta smelt, especially during early larval development.

  3. Crystallization and preliminary X-ray diffraction studies of delta-toxin from Clostridium perfringens

    International Nuclear Information System (INIS)

    The crystallization of the C. perfringens delta-toxin is reported. Clostridium perfringens is a Gram-positive anaerobic bacterium that is responsible for a wide range of diseases in humans and both wild and domesticated animals, including birds. C. perfringens is notable for its ability to produce a plethora of toxins, e.g. phospholipases C (alpha-toxin), pore-forming toxins (epsilon-toxin, beta-toxin and enterotoxin) and binary toxins (iota-toxin). Based on alpha-, beta-, epsilon- and iota-toxin production, the bacterium is classified into five different toxinotypes (A–E). Delta-toxin, which is a 32.6 kDa protein with 290 amino acids, is one of three haemolysins released by type C and possibly by type B strains of C. perfringens. This toxin is immunogenic and lytic to erythrocytes from the even-toed ungulates sheep, goats and pigs, and is cytotoxic to other cell types such as rabbit macrophages, human monocytes and blood platelets from goats, rabbits, guinea pigs and humans. The recombinant delta-toxin has been cloned, expressed, purified and crystallized in two different crystal forms by the hanging-drop vapour-diffusion method. Of these two different crystal forms, only the form II crystal diffracted to atomic resolution (dmin = 2.4 Å), while the form I crystal diffracted to only 15 Å resolution. The form II crystals belonged to space group P21212, with one molecule in the crystallographic asymmetric unit and unit-cell parameters a = 49.66, b = 58.48, c = 112.93 Å

  4. Flow patterns and morphology of a prograding river delta

    Science.gov (United States)

    Shaw, John B.; Mohrig, David; Wagner, R. Wayne

    2016-02-01

    The transition of flow between laterally confined channels and the unchannelized delta front controls the morphodynamic evolution of river deltas but has rarely been measured at the field scale. We quantify flow patterns and bathymetry that define the evolution of the subaqueous delta front on the Wax Lake Delta, a rapidly prograding delta in coastal Louisiana. A significant portion of flow (˜59%) departs the channel network over lateral channel margins as opposed to the downstream channel tips. Bathymetric surveys and remotely sensed estimates of flow direction allow spatial changes in flow velocity to be quantified and patterns of erosion and deposition to be estimated. Shallowing along channel margins produces spatial acceleration and erosion. Lateral spreading, deceleration, and deposition occur within three to eight channel widths outside of the channel margins. In interdistributary bays, the shape of each flow path is constrained by "nourishment boundaries" that separate the outflows from neighboring channels. Deposit elevation decreases with a basinward slope of 2.4 × 10-4 with distance from a channel margin along any flow path, regardless of the channel or location that flow departed the network. Bathymetric depressions called "interdistributary troughs" form along nourishment boundaries where flow paths are the longest and deposit elevation is correspondingly low. We conclude that the deposit morphology exerts a strong control on bathymetric evolution and that interaction between neighboring channels and even neighboring deltas can influence delta front morphology.

  5. Tidal inlet variability in Mississippi River delta plain

    Energy Technology Data Exchange (ETDEWEB)

    Levin, D.; Nummedal, D.; Penland, S.

    1983-09-01

    Stratigraphic sequences of deltaic and shallow marine origin commonly contain sand bodies transgressively overlying lower delta-plain and delta-front deposits. Although generally ascribed to barriers formed during the destructive phase of the delta cycle, most of this sand is probably of tidal-inlet origin because of the high preservation potential for sediment deposited below the base of the retreating shoreface in deep migratory tidal channels and their associated tidal deltas. To facilitate the identification of such units, this paper reviews the temporal evolution of the inlet sand bodies found along the rapidly transgressive shoreline of the abandoned Holocene Mississippi River deltas. This study also reveals that tide dominance of a coastline is not simply a function of tide range and wave height; it depends largely on the tidal prism, an inlet parameter which, in Louisiana, changes rapidly over time. Three distinct stages can be identified in the evolutionary sequence for Louisiana tidal inlets: (1) wave-dominated inlets with flood-tidal deltas, (2) tide-dominated inlets with large ebb deltas, and (3) wide, transitional inlets with sand bodies confined to the throat section. As the inlets migrate during the transgression, they will leave behind on the continental shelf, tidal sand bodies with a landward succession of facies changing from those characteristic of wave dominance, into tide dominance, and back again to transitional or wave-dominated inlets.

  6. The Mississippi Delta Region: Past, Present, and Future

    Science.gov (United States)

    Blum, Michael D.; Roberts, Harry H.

    2012-05-01

    The Mississippi delta region of south Louisiana houses a wealth of resources within a dynamic, subsiding landscape. Foundations for the delta region reflect Neogene evolution of the depocenter, whereas details of the modern landscape reflect late Pleistocene to Holocene evolution of the alluvial-deltaic plain. The Holocene delta plain was constructed by cyclical growth of deltaic headlands, followed by avulsion and relocation of the fluvial sediment source. Abandoned headlands were then submerged and reworked while a new headland was created at the site of active fluvial sediment input. Historic-period levees have decoupled the delta plain from its fluvial sediment source at the same time global sea-level rise was accelerating, which has accelerated delta-plain submergence. Diversions of Mississippi River water and sediment are necessary to achieve delta plain sustainability, but upstream dams trap ˜50% of the total sediment load, and there is not enough supply to keep pace with subsidence and accelerated sea-level rise. The future delta region will not resemble the recent past, and significant drowning is inevitable.

  7. Ancient deltas on Mars: outstanding targets for martian habitability?

    Science.gov (United States)

    Gupta, S.; Fawdon, P.; Grindrod, P. M.; Balme, M. R.; Hauber, E.; Warner, N. H.; Muller, J. P.

    2014-12-01

    The identification of putative ancient deltaic sedimentary systems on Mars has been both exciting and controversial. Our excitement is elicted by the potential provided by deltas as evidence for standing bodies of water associated with the deltas, and the resulting implications for both the ancient climate of Mars and ancient habitability. The controversy stems from how confident can we be in the identification of ancient deltaic systems from orbital data, and how robust are our assertions about the habitability potential of such settings. Delta systems in particular are key astrobiological targets because at their distal toes fine-grained sediment (ie., clays) settle from suspension in a lower energy setting and they are commonly characterised by high rates of sedimentation. This leads to high preservation potential of biosignatures. Targeting of future Mars rovers to investigate deltaic landing sites requires better understanding of these issues to reduce exploration risk. In this presentation, we describe the key criteria that enable us to make robust interpretations of deltaic stratigraphy and constrain delta evolution for martian systems. In particular, the past 10 years has seen in a revolution in our process understanding of terrestrial delta systems through a combination of field, experimental and numerical modelling studies. Analysis of martian deltas has much to gain from these results. We go on to consider why deltaic systems offer potential as astrobiological target paleoenvironments. We use the exhumed delta system (Hypanis delta system) at the termination of Hypanis Vallis, 11.8°N, 314.96°E as a case example. This system, situated in Xanthe Terra, comprises layered sedimentary rocks with an overall multi-lobate geometry and associated inverted channel networks. The Hypanis 'delta' is a proposed landing site for the ExoMars rover and also for the NASA 2020 mission.

  8. Late quaternary evolution of the Orinoco Delta, Venezuela

    Science.gov (United States)

    Warne, A.G.; Guevara, E.H.; Aslan, A.

    2002-01-01

    The modern Orinoco Delta is the latest of a series of stacked deltas that have infilled the Eastern Venezuelan Basin (EVB) since the Oligocene. During the late Pleistocene sea-level lowstand (20,000 to 16,000 yrs BP), bedrock control points at the position of the present delta apex prevented the river channel from incising as deeply as many other major river systems. Shallow seismic data indicate that the late Pleistocene Orinoco incised into the present continental shelf, where it formed a braided-river complex that transported sediment to a series of shelf-edge deltas. As sea level rose from 16,000 to 9,500 yrs BP, the Orinoco shoreline shifted rapidly landward, causing shallow-marine waves and currents to form a widespread transgressive sand unit. Decelerating sea-level rise and a warmer, wetter climate during the early Holocene (9,500 to 6,000 yrs BP) induced delta development within the relatively quiet-water environment of the EVB embayment. Sea level approached its present stand in the middle Holocene (6,000 to 3,000 yrs BP), and the Orinoco coast prograded, broadening the delta plain and infilling the EVB embayment. Significant quantities of Amazon sediment began to be transported to the Orinoco coast by littoral currents. Continued progradation in the late Holocene caused the constriction at Boca de Serpientes to alter nearshore and shelf hydrodynamics and subdivide the submarine delta into two distinct areas: the Atlantic shelf and the Gulf of Paria. The increased influence of littoral currents along the coast promoted mudcape development. Because most of the water and sediment were transported across the delta plain through the Rio Grande distributary in the southern delta, much of the central and northwestern delta plain became sediment starved, promoting widespread accumulation of peat deposits. Human impacts on the delta are mostly associated with the Volca??n Dam on Can??o Manamo. However, human activities have had relatively little effect on the

  9. Holocene evolution of the western Orinoco Delta, Venezuela

    Science.gov (United States)

    Aslan, A.; White, W.A.; Warne, A.G.; Guevara, E.H.

    2003-01-01

    The pristine nature of the Orinoco Delta of eastern Venezuela provides unique opportunities to study the geologic processes and environments of a major tropical delta. Remote-sensing images, shallow cores, and radiocarbon-dating of organic remains form the basis for describing deltaic environments and interpreting the Holocene history of the delta. The Orinoco Delta can be subdivided into two major sectors. The southeast sector is dominated by the Rio Grande-the principal distributary-and complex networks of anastomosing fluvial and tidal channels. The abundance of siliciclastic deposits suggests that fluvial processes such as over-bank flooding strongly influence this part of the delta. In contrast, the northwest sector is represented by few major distributaries, and overbank sedimentation is less widespread relative to the southeast sector. Peat is abundant and occurs in herbaceous and forested swamps that are individually up to 200 km2 in area. Northwest-directed littoral currents transport large volumes of suspended sediment and produce prominent mudcapes along the northwest coast. Mapping of surface sediments, vegetation, and major landforms identified four principal geomorphic systems within the western delta plain: (1) distributary channels, (2) interdistributary flood basins, (3) fluvial-marine transitional environments, and (4) marine-influenced coastal environments. Coring and radiocarbon dating of deltaic deposits show that the northern delta shoreline has prograded 20-30 km during the late Holocene sea-level highstand. Progradation has been accomplished by a combination of distributary avulsion and mudcape progradation. This style of deltaic progradation differs markedly from other deltas such as the Mississippi where distributary avulsion leads to coastal land loss, rather than shoreline progradation. The key difference is that the Orinoco Delta coastal zone receives prodigious amounts of sediment from northwest-moving littoral currents that transport

  10. Terahertz radiation from delta-doped GaAs

    DEFF Research Database (Denmark)

    Birkedal, Dan; Hansen, Ole; Sørensen, Claus Birger; Jarasiunas, K.; Brorson, S. D.; Keiding, S. R.

    1994-01-01

    Terahertz pulse emission from four different delta-doped molecular beam epitaxially grown GaAs samples is studied. We observe a decrease of the emitted THz pulse amplitude as the distance of the delta-doped layer from the surface is increased, and a change in polarity of the THz pulses as compared...... to bulk n-type doped GaAs reference samples. The electric fields in the region of the doping layer are investigated by photoreflectance spectroscopy. A careful analysis of Franz-Keldysh oscillations observed in the photoreflectance spectra provides information about the built-in fields on both sides...... of the delta-doped layer....

  11. Verification of Software Product Lines with Delta-Oriented Slicing

    Science.gov (United States)

    Bruns, Daniel; Klebanov, Vladimir; Schaefer, Ina

    Software product line (SPL) engineering is a well-known approach to develop industry-size adaptable software systems. SPL are often used in domains where high-quality software is desirable; the overwhelming product diversity, however, remains a challenge for assuring correctness. In this paper, we present delta-oriented slicing, an approach to reduce the deductive verification effort across an SPL where individual products are Java programs and their relations are described by deltas. On the specification side, we extend the delta language to deal with formal specifications. On the verification side, we combine proof slicing and similarity-guided proof reuse to ease the verification process.

  12. Four-nucleon system with $\\Delta$-isobar excitation

    OpenAIRE

    Deltuva, A.; Fonseca, A.C.; Sauer, P. U.

    2008-01-01

    The four-nucleon bound state and scattering below three-body breakup threshold are described based on the realistic coupled-channel potential CD Bonn + $\\Delta$ which allows the excitation of a single nucleon to a $\\Delta$ isobar. The Coulomb repulsion between protons is included. In the four-nucleon system the two-baryon coupled-channel potential yields effective two-, three- and four-nucleon forces, mediated by the $\\Delta$ isobar and consistent with each other and with the underlying two-n...

  13. Heat Balanced Bolometer with Sigma-Delta Interface

    OpenAIRE

    Denoual, Matthieu; Pouliquen, Mathieu; Allègre, Gilles; Brouard, D.; Veith, A; De Sagazan, Olivier; Attia, Patrick

    2012-01-01

    This paper presents a single-loop 2nd order sigmadelta interface circuit for a bolometer operating in closed-loop mode. Switched capacitor circuitry is developed to implement the sigma-delta structure. The sigma-delta modulator acts both as digital readout circuit and as a mean of heat feedback. The design approach of the sigma-delta structure and the feedback shaping is explained. The circuit is designed for a realization in AMS CMOS 0.35μm technology.

  14. CCD-Delta a and BVR photometry of NGC 7296

    CERN Document Server

    Netopil, M; Maitzen, H M; Claret, A; Pavlovski, K; Tamajo, E

    2005-01-01

    The first CCD photometric investigation of the open cluster NGC 7296 up to now was performed within the narrow band Delta a photometric system, which enables us to detect peculiar objects. A deeper investigation of that cluster followed, using the standard BVR-Bessel filter set. The age and E(B-V) was determined independently to log t= 8.0 and 0.15 respectively by using Delta a and broadband photometry. In total five Be/Ae objects and two metal-weak stars showing significant negative Delta a-values as well as one classical chemically peculiar star could be identified within that intermediate age open cluster.

  15. The primary structure of Plasmodium falciparum DNA polymerase delta is similar to drug sensitive delta-like viral DNA polymerases.

    Science.gov (United States)

    Fox, B A; Bzik, D J

    1991-12-01

    We report the isolation and sequencing of genomic DNA clones that encode the 1094-amino acid catalytic subunit of DNA polymerase delta from the human malaria parasite Plasmodium falciparum. Protein sequence comparison to other DNA polymerases revealed the presence of six highly conserved regions found in alpha-like DNA polymerases from different prokaryotic, viral, and eukaryotic sources. Five additional regions of amino acid sequence similarity that are only conserved in delta and delta-like DNA polymerases, so far, were present in P. falciparum DNA polymerase delta. P. falciparum DNA polymerase delta was highly similar to both Saccharomyces cerevisiae DNA polymerase delta (DNA polymerase III; CDC2) and Epstein-Barr virus DNA polymerase at the amino acid sequence, and the predicted protein secondary structure levels. The gene that encodes DNA polymerase delta resides as a single copy on chromosome 10, and is expressed as a 4.5-kb mRNA during the trophozoite and schizont stages when parasite chromosomal DNA synthesis is active. PMID:1775172

  16. Delta Morphodynamics Matters! Ecosystem Services, Poverty and Morphodynamic Change in the Ganges-Brahmaputra Mega-Delta

    Science.gov (United States)

    Nicholls, R. J.; Adger, N.; Allan, A.; Darby, S. E.; Hutton, C.; Matthews, Z.; Rahman, M.; Whitehead, P. G.; Wolf, J.

    2013-12-01

    The world's deltas are probably the most vulnerable type of coastal environment, and they face multiple stresses in the coming decades. These stresses include, amongst others, local drivers due to land subsidence, population growth and urbanisation within the deltas, regional drivers due to changes in catchment management (e.g. upstream land use and dam construction), as well as global climate change impacts such as sea-level rise. At the same time, the ecosystem services of river deltas support high population densities, with around 14% of the global population inhabiting deltas. A large proportion of these people experience extremes of poverty and they are therefore severely exposed to vulnerability from environmental and ecological stress and degradation. In areas close to or below the poverty boundary, both subsistence and cash elements of the economy tend to rely disproportionately heavily on ecosystem services which underpin livelihoods. Therefore, to sustainably manage delta environments they must be viewed as complex social-environmental systems where change is only partially driven by physical drivers such as sea level rise and climate change, and human-induced development activities are also critical. Here we outline a new conceptual framework for the development of methods to understand and characterise the key drivers of change in ecosystem services that affect the environment and economic status of populous deltas, focusing specifically on the Ganges-Brahmaputra-Meghna (GBM) mega-delta. The GBM delta is characterised by densely populated coastal lowlands with significant poverty, with livelihoods supported to a large extent by natural ecosystems such as the Sunderbahns (the largest mangrove forest in the world). However, the GBM delta is under severe development pressure due to many growing cities. At present the importance of ecosystems services to poverty and livelihoods is poorly understood. This is due to due to the complexity of interactions

  17. Three-body calculation of the Delta-Delta dibaryon candidate D(03) at 2.37 GeV

    CERN Document Server

    Gal, Avraham

    2013-01-01

    The I(JP)=0(3+) D(03) dibaryon candidate observed as resonance at 2.37 GeV in pion-production pn collisions by WASA@COSY is relegated within a dynamical pion-nucleon-Delta three-body model to a Delta-Delta (upper) pion-D(12) (lower) coupled-channel quasi-bound dibaryon state, where D(12) is the dibaryon observed in the 1D2 partial wave of pp scattering at 2.15 GeV

  18. The hepatitis delta virus: Replication and pathogenesis.

    Science.gov (United States)

    Sureau, Camille; Negro, Francesco

    2016-04-01

    Hepatitis delta virus (HDV) is a defective virus and a satellite of the hepatitis B virus (HBV). Its RNA genome is unique among animal viruses, but it shares common features with some plant viroids, including a replication mechanism that uses a host RNA polymerase. In infected cells, HDV genome replication and formation of a nucleocapsid-like ribonucleoprotein (RNP) are independent of HBV. But the RNP cannot exit, and therefore propagate, in the absence of HBV, as the latter supplies the propagation mechanism, from coating the HDV RNP with the HBV envelope proteins for cell egress to delivery of the HDV virions to the human hepatocyte target. HDV is therefore an obligate satellite of HBV; it infects humans either concomitantly with HBV or after HBV infection. HDV affects an estimated 15 to 20million individuals worldwide, and the clinical significance of HDV infection is more severe forms of viral hepatitis - acute or chronic -, and a higher risk of developing cirrhosis and hepatocellular carcinoma in comparison to HBV monoinfection. This review covers molecular aspects of HDV replication cycle, including its interaction with the helper HBV and the pathogenesis of infection in humans. PMID:27084031

  19. Sharecropping Contract Experience in Delta State, Nigeria

    Institute of Scientific and Technical Information of China (English)

    Albert Ukaro Ofuoku

    2015-01-01

    Sharecropping has been an age long practice from ancient times. Some scholars saw the practice as being exploitative of the tenants, yet it is still being practiced. The reasons behind it continual practice need to be unveiled. This study was therefore conducted to examine the sharecropping contract experience in Delta State, Nigeria. The landlords decided to practice sharecropping as a result of emigration of their household members, farm size and cost of labours, some of them gave age and their primary occupation as factors for their decisions to opt for sharecropping arrangement. The yields were shared on the basis of 60% for the landlord to 40% for the tenant. The landlords provided all the equipment and inputs, while the tenant's carried out all the farm operations. They faced the constraints of stress, but were able to cope with them, because of hospitals and health centres nearby. The result of the test of hypothesis confirmed the reasons given for deciding on sharecropping arrangement. It was concluded that sharecropping was not exploitative. It was recommended that the practice of sharecropping should be encouraged and not diversified into other sources of livelihood should do so.

  20. Morphologic and stratigraphic evolution of muddy ebb-tidal deltas along a subsiding coast: Barataria Bay, Mississippi River delta

    Science.gov (United States)

    FitzGerald, D.M.; Kulp, M.; Penland, S.; Flocks, J.; Kindinger, J.

    2004-01-01

    The Barataria barrier coast formed between two major distributaries of the Mississippi River delta: the Plaquemines deltaic headland to the east and the Lafourche deltaic headland to the west. Rapid relative sea-level rise (1??03 cm year-1) and other erosional processes within Barataria Bay have led to substantial increases in the area of open water (> 775 km2 since 1956) and the attendant bay tidal prism. Historically, the increase in tidal discharge at inlets has produced larger channel cross-sections and prograding ebb-tidal deltas. For example, the ebb delta at Barataria Pass has built seaward > 2??2 km since the 1880s. Shoreline erosion and an increasing bay tidal prism also facilitated the formation of new inlets. Four major lithofacies characterize the Barataria coast ebb-tidal deltas and associated sedimentary environments. These include a proximal delta facies composed of massive to laminated, fine grey-brown to pale yellow sand and a distal delta facies consisting of thinly laminated, grey to pale yellow sand and silty sand with mud layers. The higher energy proximal delta deposits contain a greater percentage of sand (75-100%) compared with the distal delta sediments (60-80%). Associated sedimentary units include a nearshore facies consisting of horizontally laminated, fine to very fine grey sand with mud layers and an offshore facies that is composed of grey to dark grey, laminated sandy silt to silty clay. All facies coarsen upwards except the offshore facies, which fines upwards. An evolutionary model is presented for the stratigraphic development of the ebb-tidal deltas in a regime of increasing tidal energy resulting from coastal land loss and tidal prism growth. Ebb-tidal delta facies prograde over nearshore sediments, which interfinger with offshore facies. The seaward decrease in tidal current velocity of the ebb discharge produces a gradational contact between proximal and distal tidal delta facies. As the tidal discharge increases and the inlet

  1. EAARL Coastal Topography--Pearl River Delta 2008: Bare Earth

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — A bare earth elevation map (also known as a Digital Elevation Model, or DEM) of the Pearl River Delta in Louisiana and Mississippi was produced from remotely...

  2. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 2000

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 2000 calendar year. The report begins with a...

  3. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1993

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1993 calendar year. The report begins with a...

  4. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1990

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1990 calendar year. The report begins with a...

  5. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1989

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1989 calendar year. The report begins with a...

  6. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1986

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1986 calendar year. The report begins with a...

  7. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1999

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1999 calendar year. The report begins with a...

  8. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1996

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1996 calendar year. The report begins with a...

  9. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1988

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1988 calendar year. The report begins with a...

  10. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1997

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1997 calendar year. The report begins with a...

  11. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1984

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1984 calendar year. The report begins with a...

  12. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1995

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1995 calendar year. The report begins with a...

  13. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1985

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1985 calendar year. The report begins with a...

  14. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1994

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1994 calendar year. The report begins with a...

  15. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 2002

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 2002 calendar year. The report begins with a...

  16. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1992

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1992 calendar year. The report begins with a...

  17. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1987

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1987 calendar year. The report begins with a...

  18. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1983

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1983 calendar year. The report begins with a...

  19. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1991

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1991 calendar year. The report begins with a...

  20. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 2001

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 2001 calendar year. The report begins with a...

  1. Yukon Delta National Wildlife Refuge : Narrative Report : Calendar Year 1998

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This annual narrative report for Yukon Delta National Wildlife Refuge outlines Refuge accomplishments during the 1998 calendar year. The report begins with a...

  2. LiDAR data for the Delta Area of California

    Data.gov (United States)

    California Department of Resources — LiDAR data for the Delta Area of California from the California Department of Water Resources. Bare earth grids from LiDAR.This data is in ESRI Grid format with 2...

  3. Study of delta18O calcite-dolomite mixtures

    International Nuclear Information System (INIS)

    Isotope ratio of oxygen in carbonate mixtures has been studied. For the purpose samples of calcite and dolomite with the known values delta18O are mixed in the ratios 9:1, 3:1, 1:1, 1:3, 1:9. Then from the mixtures prepared CO2 gas is separated using the McCrea method, delta18O of the gas is measured using mass-srectrometer. It has been established that to obtain delta18O calcite in the mixtures with calcite excess CO2 gas should be collected in the interval 15-30 min of the reaction duration and for the mixtures with dolomite excess - in the interval 5-15 min. To determine delta18O of dolomite the optimum time of CO2 gas collection for all the mixtures is 4-24 h

  4. Sand shoal development on muddy Mississippi river delta shelf

    Energy Technology Data Exchange (ETDEWEB)

    Penland, S.; Suter, J.R.; Moslow, T.F.

    1984-04-01

    Trinity and Ship Shoals are transgressive sand bodies on the Louisiana inner continental shelf, and they represent the reworked sands of the abandoned Holocene Teche and Maringouin deltas. The development of these shoals is initiated by an episode of delta abandonment followed by subsidence-enhanced sea level rise. Through the process of shoreface retreat, the abandoned delta lobe evolves from an erosional headland with flanking barrier islands to a barrier-island arch and finally into a submerged inner-shelf shoal system. Trinity and Ship Shoals represent the final stage in the Mississippi River delta barrier shoreline cycle and provide a possible modern analogue for some Cretaceous shelf sandstones of the Western Interior. More than 1000 km (620 mi) of high-resolution seismic profiles correlated with cores provide the data base for interpretation of the depositional history of sand-body development on the muddy Louisiana shelf.

  5. EAARL Coastal Topography--Pearl River Delta 2008: First Surface

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — A first surface elevation map (also known as a Digital Elevation Model, or DEM) of the Pearl River Delta in Louisiana and Mississippi was produced from remotely...

  6. Linear delta expansion technique for the solution of anharmonic oscillations

    Indian Academy of Sciences (India)

    P K Bera; J Datta

    2007-01-01

    The linear delta expansion technique has been developed for solving the differential equation of motion for symmetric and asymmetric anharmonic oscillators. We have also demonstrated the sophistication and simplicity of this new perturbation technique.

  7. Birds and mammals of the Copper River Delta

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The objectives of this report are: 1 to describe the habitats available for birds and mammals on the Copper River Delta 2 to present an annotated list of birds and...

  8. Report of banding operations, Yukon-Kuskokwim Delta, 1952

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report covers the banding operations in the YukonKuskokwim Delta in 1952. Methods for cacklers, brants, whitefronted goose, and nesting conditions are covered....

  9. Profiling risk and sustainability in coastal deltas of the world

    Science.gov (United States)

    Tessler, Z. D.; Vörösmarty, C. J.; Grossberg, M.; Gladkova, I.; Aizenman, H.; Syvitski, J. P. M.; Foufoula-Georgiou, E.

    2015-08-01

    Deltas are highly sensitive to increasing risks arising from local human activities, land subsidence, regional water management, global sea-level rise, and climate extremes. We quantified changing flood risk due to extreme events using an integrated set of global environmental, geophysical, and social indicators. Although risks are distributed across all levels of economic development, wealthy countries effectively limit their present-day threat by gross domestic product-enabled infrastructure and coastal defense investments. In an energy-constrained future, such protections will probably prove to be unsustainable, raising relative risks by four to eight times in the Mississippi and Rhine deltas and by one-and-a-half to four times in the Chao Phraya and Yangtze deltas. The current emphasis on short-term solutions for the world’s deltas will greatly constrain options for designing sustainable solutions in the long term.

  10. Novel urinary metabolite of d-delta-tocopherol in rats

    International Nuclear Information System (INIS)

    A novel metabolite of d-delta-tocopherol was isolated from the urine of rats given d-3,4-[3H2]-delta-tocopherol intravenously. The metabolite was collected from the urine of rats given d-delta-tocopherol in the same manner as that of the labeled compound. It was found that the metabolites consisted of sulfate conjugates. The portion of the major metabolite released with sulfatase was determined to be 2,8-dimethyl-2-(2'-carboxyethyl)-6-chromanol by infrared spectra, nuclear magnetic resonance spectra, and mass spectra. The proposed structure was confirmed by comparing the analytical results with those of a synthetically derived compound. As a result of the structural elucidation of this novel metabolite, a pathway for the biological transformation of delta-tocopherol is proposed which is different from that of alpha-tocopherol. A characteristic feature of the pathway is the absence of any opening of the chroman ring throughout the sequence

  11. Delta and Breton National Wildlife Refuges: Comprehensive Conservation Plan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Comprehensive Conservation Plan CCP was written to guide management on Delta and Breton NWRs for the next 15 years. This plan outlines the refuges vision and...

  12. Noise Study of a Heat Balanced Sigma-Delta Bolometer

    OpenAIRE

    Denoual, Matthieu; Brouard, D.; Veith, A; Pouliquen, Mathieu; Attia, Patrick; Allègre, Gilles

    2013-01-01

    The paper presents the modeling of a heat balanced sigma-delta bolometer with Matlab Simulink®. In particular, the noise sources are modeled to enable the evaluation of the output measurement resolution.

  13. Rarotonga Radiocarbon (delta 14C) for 1950 to 1997

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Rarotonga coral radiocarbon (14C) timeseries. Coral radiocarbon (Delta-14C) on untreated, low-speed drilled samples. Precision is +/- 4 per mil as documented by an...

  14. Pteridophytes of the Okavango Delta, Botswana (Southern Africa

    Directory of Open Access Journals (Sweden)

    Vega Hernández, Efrén

    2000-12-01

    Full Text Available The Okavango Delta in Botswana constitutes one of the larger inland deltas in the world. Fifteen species of fern were found in this ecological system integrated into 10 genera and 9 families. Included in this report are descriptions of each family, genus and species. Also given are artificial keys to the genera, as well as keys for genera and species within the family when necessary. A documented distribution and ecological notes for each species also appears.Se estudian los pterid6fitos del delta del Okavango, uno de los deltas interiores ma's grandes del mundo. Se citan 15 especies, incluidas en 10 generos y 9 familias. Se aportan descripciones, claves de identification, datos sobre la distribucitin y ecologia. y mapas de distribuci6n detallada de cada una de las especies.

  15. Migratory Bird Avian Influenza Sampling; Yukon Kuskokwim Delta, Alaska, 2015

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — Data set containing avian influenza sampling information for spring and summer waterbirds on the Yukon Kuskokwim Delta, 2015. Data contains sample ID, species...

  16. O resgate da epistemologia

    OpenAIRE

    João Arriscado Nunes

    2012-01-01

    Ao longo das três últimas décadas, o projecto da epistemologia passou por um processo de crítica e de transformação, marcado, sucessivamente, pela transferência da soberania epistémica para o “social”, pela redescoberta da ontologia e pela atenção à normatividade constitutiva e às implicações políticas do conhecimento, chegando mesmo a ser postulado o abandono da epistemologia como projecto filosófico. Em contraponto a esse processo, foi ganhando contornos a proposta de uma outra epistemologi...

  17. GERONTOLOGIA: ESTADO DA ARTE

    OpenAIRE

    Vera M. A.Tordino Brandão*; Elisabeth F. Mercadante; Suzana A. R. Medeiros; Flamínia M.M. Lodovici; Maria Helena Villas Bôas Concone; Ruth Gelehrter da Costa Lopes; Beltrina Côrte; Nadia Dumara Ruiz Silveira

    2010-01-01

    O Programa de Gerontologia da PUC desenvolve pesquisas focando o ser na perspectiva do envelhecimento. As atividades são interdisciplinares e reúnem docentes, alunos e ex-alunos. Nesta mesa redonda apresentamos um panorama sobre estes estudos. Na área da educação e comunicação o foco está centrado na longevidade e na preparação e representação social da velhice. São ressaltadas como temáticas: a formação continuada de profissionais e pesquisadores; o significado da religiosidade/espiritualida...

  18. Effects of DPDPE (a specific delta-opioid receptor agonist) and naloxone on hypothalamic monoamine concentrations during the pre-ovulatory LH surge in the rat.

    Science.gov (United States)

    Yilmaz, B; Gilmore, D P; Wilson, C A

    1998-11-01

    We have investigated the inter-relationship between the opioid and aminergic systems in the control of secretion of the pro-oestrous LH surge and the involvement of delta-opioid receptor subtypes in this process. Conscious female rats bearing a cannula in the femoral artery were injected i.p. with a selective delta-opioid receptor agonist (DPDPE) either alone or with the opioid antagonist (naloxone) at 1300 h on the day of pro-oestrus. Blood samples were collected hourly between 1500 h and 1900 h, and plasma LH levels were measured by RIA. At the end of this period (1900 h), the animals were autopsied and the concentrations of the amines (noradrenaline (NA), dopamine (DA), 5-hydroxytryptamine (5HT)) and their metabolites (dihydroxyphenolglycol (DHPG) and 5-hydroxyindoleacetic acid (5HIAA), metabolites of NA and 5HT respectively) were determined by HPLC with electrochemical detection in the medial preoptic area, suprachiasmatic nucleus, median eminence and arcuate nucleus. DPDPE abolished the LH surge and concomitantly decreased hypothalamic NA and DHPG concentrations in all the areas examined. The levels of DA, 5HT and 5HIAA were also reduced in all hypothalamic regions studied, except DA and 5HIAA in the suprachiasmatic nucleus. Naloxone reversed these inhibitory effects of the delta-agonist. We conclude that activation of delta-opioid receptors may exert an inhibitory effect on LH release. The effect is probably an indirect one mediated by the monoaminergic systems, as they are suppressed by DPDPE in nearly all the hypothalamic regions studied. PMID:9849821

  19. Quantification of sediment budgets at an arctic delta

    Science.gov (United States)

    Kroon, A.; Bendixen, M.; Sigsgaard, C.

    2012-12-01

    The impact of ice and snow and freezing temperatures make arctic polar coastal environments quite unique and different from other coastal environments for instance in temperate zones or in tropic areas. The coastal processes and the morphologic evolution of landforms in these areas are strongly influenced by common factors such as cold temperatures, (dis)continuous or sporadic permafrost, and the presence of sea ice cover. Most of these factors have a strong seasonality and the impact of classic coastal processes by waves and tides are often limited to the summer and early fall. Global climate changes induce a lot of changes along the arctic coasts. Sea-levels are rising due to an increased fresh water flux from the glaciers and land ice masses. At the same time, the ice coverage of the coastal waters decreases and the open water periods in summer extend. This might cause extra wave activity with higher erosion rates along many of the shorelines. Many fjords and open coastal stretches in North-East Greenland have deltas. The sources for the sediments for these deltas are located in the drainage basins of rivers that are fed by melting glaciers. These rivers drain pro-glacial and fluvial valleys and may also deliver additional sediment by eroding glacial and peri-glacial deposits in the present coastal plain. Minor sources of sediment transport towards the delta come from reworking of sediments on the delta slope, through lateral transport from the adjacent shores, and through stranded sediment-loaded ice out of the fjord. Losses of sediments occur through further fluvial sediment transport over the delta towards the fjord, or by reworking of delta fringes by coastal processes due to ice, waves and tides. Sandy spits and small barriers often fringe the shoreline of a delta. These features are typically formed and active in the ice-free periods when coastal processes by waves and drifting ice rework the delta front and adjacent coastal cliffs. In this presentation

  20. Governance of ‘long term delta planning’ in Bangladesh, Vietnam and the Netherlands

    NARCIS (Netherlands)

    Staveren, van M.F.

    2014-01-01

    The Deltas in Times of Climate Change Conference II, taking place in September 2014, Rotterdam, presented a suitable occasion to discuss both delta challenges and interesting approaches to how ‘delta dynamics’ are being dealt with worldwide.1 Delta dynamics include here both environmental (including

  1. Acute delta hepatitis without circulating HBsAg.

    OpenAIRE

    De Cock, K M; Govindarajan, S; Redeker, A G

    1985-01-01

    Infection with the delta agent can only occur in the context of coexistent hepatitis B virus infection. We describe a patient in whom the clinical features of acute delta hepatitis developed when seroconversion from hepatitis B surface antigen to antibody had already occurred and diagnosis of recent acute hepatitis B was based on high titre IgM antibody to hepatitis B core antigen. We discuss the significance of such a serological profile, not previously described.

  2. Case study – Delta restoration at a steep river mouth

    OpenAIRE

    Terrier, Stéphane; De Cesare, Giovanni; Schleiss, Anton; André, S; Lecomte, E.; De Montmollin, G.

    2015-01-01

    The mouth of the Baye de Clarens torrent in Switzerland is currently constrained by lateral training walls, sequent sills and a bridge with a low hydraulic capacity. Due to a bed load trap upstream, few sediments reach the mouth. To improve flood protection and reestablish a natural dynamic mouth, a project of a delta with restored bed load was designed. In order to ensure that this newly formed delta guarantees flood protection and results in a sustainable sediment management, a physical mod...

  3. Analog Delta-Back-Propagation Neural-Network Circuitry

    Science.gov (United States)

    Eberhart, Silvio

    1990-01-01

    Changes in synapse weights due to circuit drifts suppressed. Proposed fully parallel analog version of electronic neural-network processor based on delta-back-propagation algorithm. Processor able to "learn" when provided with suitable combinations of inputs and enforced outputs. Includes programmable resistive memory elements (corresponding to synapses), conductances (synapse weights) adjusted during learning. Buffer amplifiers, summing circuits, and sample-and-hold circuits arranged in layers of electronic neurons in accordance with delta-back-propagation algorithm.

  4. Aberrant accumulation of phospholipase C-delta in Alzheimer brains.

    OpenAIRE

    Shimohama, S.; Homma, Y.; Suenaga, T.; Fujimoto, S; Taniguchi, T; Araki, W.; Yamaoka, Y; Takenawa, T.; Kimura, J

    1991-01-01

    Since phosphoinositide-specific phospholipase C (PLC) is one of the key molecules in signal transduction, the authors assessed its involvement in Alzheimer's disease (AD). Immunostaining of a specific antibody against the PLC isozyme, PLC-delta, demonstrated that this enzyme was abnormally accumulated in neurofibrillary tangles (NFT), the neurites surrounding senile plaque (SP) cores, and neuropil threads in AD brains. Western blot analysis confirmed that PLC-delta was concentrated in the pai...

  5. Ordered set partition statistics and the Delta Conjecture

    OpenAIRE

    Rhoades, Brendon

    2016-01-01

    The Delta Conjecture of Haglund, Remmel, and Wilson is a recent generalization of the Shuffle Conjecture in the field of diagonal harmonics. In this paper we give evidence for the Delta Conjecture by proving a pair of conjectures of Wilson and Haglund-Remmel-Wilson which give equidistribution results for statistics related to inversion count and major index on objects related to ordered set partitions. Our results generalize the famous result of MacMahon that major index and inversion number ...

  6. Multimegawatt DAE$\\delta$ALUS Cyclotrons for Neutrino Physics

    CERN Document Server

    Abs, M; Alonso, J R; Barletta, W A; Barlow, R; Calabretta, L; Calanna, A; Campo, D; Celona, L; Conrad, J M; Gammino, S; Kleeven, W; Koeth, T; Maggiore, M; Okuno, H; Piazza, L A C; Seidel, M; Shaevitz, M H; Stingelin, L; Yang, J J; Yeck, J

    2012-01-01

    DAE$\\delta$ALUS (Decay-At-rest Experiment for $\\delta_{CP}$ studies At the Laboratory for Underground Science) provides a new approach to the search for CP violation in the neutrino sector. High-power continuous-wave proton cyclotrons efficiently provide the necessary proton beams with an energy of up to 800 MeV to create neutrinos from pion and muon decay-at-rest. The experiment searches for $\\bar{\

  7. The SPDC and sustainable development in the Niger Delta

    OpenAIRE

    Ibaba Samuel Ibaba

    2008-01-01

    Purpose – This paper aims to examine the place of the Shell Petroleum Development Company (SPDC) in the sustainable development of the Niger Delta. Design/methodology/approach – To achieve this objective, the paper takes an overview of the oil industry and the Niger Delta. The paper further evaluates the sustainable policy of the SPDC, and highlights the strengths and weaknesses. Findings – The paper establishes that oil industry activities have undermined the sustainable development of the r...

  8. DECONSTRUCTING THE REPORTING OF HOSTAGE TAKING IN THE NIGER DELTA

    OpenAIRE

    Chigozi Ijeomah

    2012-01-01

    The pattern of reporting the January 11, 2006 incident of the kidnapping of four expatriate oil workers from the EA Oil Field in Delta State provides a window into the nature of media coverage of the escalating crisis in the Niger Delta region. This study shows that conflict reporting in the Nigerian press is ‘episodic’, featuring such conflict behaviours as the bombing of drilling platforms and oil pipelines, killing and maiming of oil workers and state security operatives, and kidnapping an...

  9. Magnetic moment of delta baryons with extended sea

    International Nuclear Information System (INIS)

    In this we have constructed the baryon wave function with suitable quark-gluon Fock states for delta particles. In our study, the sea may be consisting of two gluons or a quark-antiquark pair along with a gluon. In our study, we constrain the sea with spin 0,1,2 and color singlet state for simplicity. We have calculated the magnetic moments for delta particles, after modification in valence quark wave function with due addition of sea component

  10. A heat balanced sigma–delta uncooled bolometer

    International Nuclear Information System (INIS)

    This paper describes a heat balanced bolometer with an integrated CMOS sigma–delta interface. The sigma–delta interface accomplishes both the analogue-to-digital conversion and the heat feedback and therefore no other digital core is required. The heat feedback is implemented using a capacitively coupled electrical substitution technique with a digitally modulated signal that enables feedback linearization. Proof of concept is experimentally demonstrated with a polymer-type resistive bolometer and infrared optical source. (paper)

  11. A heat balanced sigma-delta uncooled bolometer

    OpenAIRE

    Denoual, Matthieu; Brouard, D.; Veith, A; De Sagazan, Olivier; Pouliquen, Mathieu; Attia, Patrick; Lebrasseur, E.; Mita, Y.; Allègre, Gilles

    2014-01-01

    This paper describes a heat balanced bolometer with an integrated CMOS sigma-delta interface. The sigma-delta interface accomplishes both the analogue-to-digital conversion and the heat feedback and therefore no other digital core is required. The heat feedback is implemented using a capacitively coupled electrical substitution technique with a digitally modulated signal that enables feedback linearization. Proof of concept is experimentally demonstrated with a polymer-type resistive bolomete...

  12. Near-infrared spectropolarimetry of a delta-spot

    CERN Document Server

    Balthasar, H; Louis, R E; Verma, M; Denker, C

    2014-01-01

    Sunspots harboring umbrae of both magnetic polarities within a common penumbra (delta-spots) are often but not always related to flares. We present first near-infrared (NIR) observations (Fe I 1078.3 nm and Si I 1078.6 nm spectra) obtained with the Tenerife Infrared Polarimeter (TIP) at the Vacuum Tower Telescope (VTT) in Tenerife on 2012 June 17, which afford accurate and sensitive diagnostics to scrutinize the complex fields along the magnetic neutral line of a delta-spot within active region NOAA 11504. We examine the vector magnetic field, line-of-sight (LOS) velocities, and horizontal proper motions of this rather inactive delta-spot. We find a smooth transition of the magnetic vector field from the main umbra to that of opposite polarity (delta-umbra), but a discontinuity of the horizontal magnetic field at some distance from the delta-umbra on the polarity inversion line. The magnetic field decreases faster with height by a factor of two above the delta-umbra. The latter is surrounded by its own Eversh...

  13. Phase modulated magnetoelectric delta-E effect sensor for sub-nano tesla magnetic fields

    Science.gov (United States)

    Zabel, S.; Kirchhof, C.; Yarar, E.; Meyners, D.; Quandt, E.; Faupel, F.

    2015-10-01

    We present a resonant micromechanical magnetic field sensor, which utilizes the magnetically induced change in elastic modulus, i.e., the delta-E effect. The sensor is based on magnetoelectric thin film composites, resulting in high sensitivity at room temperature and at low frequencies. The cantilever is electrically excited and read out by a 2 μm AlN piezoelectric layer. Depending on its magnetization, the 2 μm thin film of amorphous (Fe90Co10)78Si12B10 changes its elasticity, which results in a shift of the cantilever's resonance frequency. The sensor is operated in the first or second transversal bending mode at 7.6 kHz or 47.4 kHz. With a limit of detection of 140 pTHz-0.5 at 20 Hz under a magnetic bias field and 1 nTHz-0.5 without external bias field, this sensor exceeds all comparable designs by one order of magnitude.

  14. GUTs with exclusively $\\Delta$B=1, $\\Delta$L=0 R-parity violation

    CERN Document Server

    Tamvakis, Kyriakos

    1996-01-01

    We study R-parity violation in the framework of GUTs, focusing on the case that R-parity is broken exclusively through \\Delta B=1, \\Delta L=0 effective interactions. We construct two such models, an SU(5) and an SU(5)\\times U(1)_{X} model, in which R-parity breaking is induced through interactions with extra supermassive fields. The presence of only the Baryon Number violating operators {d^c}{d^c}{u^c} requires an asymmetry between quarks and leptons, which is achieved either by virtue of the Higgs representations used or by modifications in the matter multiplets. The latter possibility is realized in the second of the above models, where the left-handed leptons have been removed from the representation in which they normaly cohabit with the right-handed up quarks and enter as a combination of the isodoublets in (\\bf {{\\overline{5}},-3}) and (\\bf {5,-2}) representations. In both models the particle content below the GUT scale is unaffected by the introduced R-parity breaking sector.

  15. A Conceptual Framework for Analyzing Deltas as Coupled Social-Ecological Systems: An example from the Amazon Delta

    Science.gov (United States)

    Brondizio, E.; Vogt, N. D.; Hetrick, S.; da Costa, S. M. F.; Anthony, E.

    2015-12-01

    At the nexus of watersheds, land, coastal areas, oceans, and human settlements, river delta regions pose specific challenges to environmental governance and sustainability. Using the Amazon Delta (AD) as our focus we reflect on the challenges created by the high degree of functional interdependencies shaping social-ecological dynamics of delta regions. The article introduces the initial design of an integrated conceptual framework to analyze delta regions as coupled social-ecological systems (SES). The first component of the framework is used to provide integrated definitions of delta regions according to a problem and/or collective action dilemma. Five different systematic components are suggested: social-economic systems, governance systems, ecosystems-resource systems, topographic-hydrological systems, and oceanic-climate systems. The second component of the framework presents a strategy for nested social ecological analysis to examine collective action situations in delta regions from local to regional and basin levels. The article provides illustrative applications of the framework to the Amazon Delta. First, it is used to define the AD region as a coupled, multi-level SES. We further proposed a definition of what we call the core SES of the AD. We then utilize the framework to diagnose an example collective action problem related to the impacts of urban growth and pollution on small-scale fishing resources. We argue that the functional interdependencies characteristic of delta regions require new approaches to understand, diagnose, and evaluate the current and future impact of social and environmental changes and potential solutions to the sustainability dilemmas characteristic of these regions.

  16. Amostragem da flora costeira da Ilha Graciosa

    OpenAIRE

    Silva, Luís; Cordeiro, Nuno

    2005-01-01

    Neste trabalho realizou-se uma amostragem da flora da zona costeira na ilha Graciosa. Em 16 locais amostraram-se 92 plantas vasculares. O número de taxa amostrados variou entre 9 e 30, e a percentagem de taxa indígenas variou entre 6 e 70%. Apenas em 5 locais a percentagem de indígenas ultrapassou a percentagem de introduzidas. A percentagem de endémicas variou entre 0 e 30%, encontrando- se acima dos 20% apenas para três locais; apenas em dois dos locais se verificou uma total ausência de...

  17. The radiative $\\Delta \\to N \\gamma$ decay in light cone QCD

    CERN Document Server

    Aliev, T M

    1999-01-01

    The "g_{Delta N gamma}" coupling for the "Delta -> N gamma" decay is calculated in framework of the light cone QCD sum rules and is found to be g_{Delta N gamma} = (1.6 pm 0.2) GeV^(-1). Using this value of g_{Delta N gamma} we estimate the branching ratio of the Delta^+ -> N gamma decay, which is in a very good agreement with the experimental result.

  18. Transmission of the hepatitis B virus-associated delta agent to the eastern woodchuck.

    OpenAIRE

    Ponzetto, A; Cote, P. J.; Popper, H.; Hoyer, B H; London, W. T.; Ford, E. C.; Bonino, F; Purcell, R H; Gerin, J L

    1984-01-01

    delta agent of human origin was inoculated into four woodchucks chronically infected with woodchuck hepatitis virus (WHV). The animals developed delta infections with serologic patterns similar to those previously observed in human and chimpanzee infections. delta antigen was detected transiently in serum and liver and was followed by seroconversion to anti-delta antibody. Analogous to the chimpanzee model of delta infection, serum and hepatocyte markers of WHV were suppressed in the woodchuc...

  19. Experimental river delta size set by multiple floods and backwater hydrodynamics

    OpenAIRE

    Ganti, Vamsi; Chadwick, Austin J.; Hassenruck-Gudipati, Hima J.; Fuller, Brian M.; Lamb, Michael P.

    2016-01-01

    River deltas worldwide are currently under threat of drowning and destruction by sea-level rise, subsidence, and oceanic storms, highlighting the need to quantify their growth processes. Deltas are built through construction of sediment lobes, and emerging theories suggest that the size of delta lobes scales with backwater hydrodynamics, but these ideas are difficult to test on natural deltas that evolve slowly. We show results of the first laboratory delta built through successive deposition...

  20. Assessment of Factors Contributing to Health Outcomes in the Eight States of the Mississippi Delta Region

    Science.gov (United States)

    Jovaag, Amanda; Catlin, Bridget B.; Rodock, Matthew; Park, Hyojun

    2016-01-01

    Introduction The objective of this observational study was to examine the key contributors to health outcomes and to better understand the health disparities between Delta and non-Delta counties in 8 states in the Mississippi River Delta Region. We hypothesized that a unique set of contributors to health outcomes in the Delta counties could explain the disparities between Delta and non-Delta counties. Methods Data were from the 2014 County Health Rankings for counties in 8 states (Alabama, Arkansas, Illinois, Kentucky, Louisiana, Mississippi, Missouri, and Tennessee). We used the Delta Regional Authority definition to identify the 252 Delta counties and 468 non-Delta counties or county equivalents. Information on health factors (eg, health behaviors, clinical care) and outcomes (eg, mortality) were derived from 38 measures from the 2014 County Health Rankings. The contributions of health factors to health outcomes in Delta and non-Delta counties were examined using path analysis. Results We found similarities between Delta counties and non-Delta counties in the health factors (eg, tobacco use, diet and exercise) that significantly predicted the health outcomes of self-rated health and low birthweight. The most variation was seen in predictors of mortality; however, Delta counties shared 2 of the 3 significant predictors (ie, community safety and income) of mortality with non-Delta counties. On average across all measures, values in the Delta were 16% worse than in the non-Delta and 22% worse than in the rest of the United States. Conclusion The health status of Delta counties is poorer than that of non-Delta counties because the health factors that contribute to health outcomes in the entire region are worse in the Delta counties, not because of a unique set of health predictors. PMID:26940300

  1. Mean proloculus size, delta super(13) C and delta super(18) O variations in recent benthic foraminifera from the west coast of India and their climatic implications

    Digital Repository Service at National Institute of Oceanography (India)

    Nigam, R.; Sarkar, A.

    variabilities in delta super(18) O and delta super(13) C are rather high which may be due to disequilibrium isotopic fractionation or probably partial selection of specimens. Climatic implications of the results are discussed and few recommendations are also...

  2. Quantifying the signature of sediment composition on the topologic and dynamic complexity of river delta channel networks and inferences toward delta classification

    Science.gov (United States)

    Tejedor, Alejandro; Longjas, Anthony; Caldwell, Rebecca; Edmonds, Douglas A.; Zaliapin, Ilya; Foufoula-Georgiou, Efi

    2016-04-01

    Deltas contain complex self-organizing channel networks that nourish the surface with sediment and nutrients. Developing a quantitative understanding of how controlling physical mechanisms of delta formation relate to the channel networks they imprint on the landscape remains an open problem, hindering further progress on quantitative delta classification and understanding process from form. Here we isolate the effect of sediment composition on network structure by analyzing Delft3D river-dominated deltas within the recently introduced graph-theoretic framework for quantifying complexity of delta channel networks. We demonstrate that deltas with coarser incoming sediment tend to be more complex topologically (increased number of pathways) but simpler dynamically (reduced flux exchange between subnetworks) and that once a morphodynamic steady state is reached, complexity also achieves a steady state. By positioning simulated deltas on the so-called TopoDynamic complexity space and comparing with field deltas, we propose a quantitative framework for exploring complexity toward systematic inference and classification.

  3. Land-ocean interaction in modern delta formation and development: A case study of the Pearl River delta, China

    Institute of Scientific and Technical Information of China (English)

    李春初; 雷亚平; 何为; 戴志军

    2001-01-01

    The distinctive characteristics of the modern Pearl River delta formation and development are divided phases, diversity and imbalance in spatial and temporal. The delta was moving seaward gradually in a long period after the last Holocene glacial stage and the ancient drowned Pearl River estuary was predominated by tide. The delta was expanding quickly since fluvial force was turned to be leading status about 2500 years ago. The sediment grain size was changing longitudinally from coarser to finer. As well as the finer sediment may be reworked and redistributed shoreward by tidal current nearby the river mouth. And the fluvial-dominated delta is developed by the mutual deposition reflected in the vertical direction. According to the spatial difference of land-ocean interaction, the main body of the Pearl River delta which is the fluvial-dominated and protruding seaward is coupled with or concomitant with the estuaries and tide-dominated deltas which are adjoined to both sides of the main part like two wi

  4. Peripheral selection of V delta 1+ cells with restricted T cell receptor delta gene junctional repertoire in the peripheral blood of healthy donors

    OpenAIRE

    1993-01-01

    To characterize the T cell receptor (TCR) repertoire expressed by the V delta 1+ gamma/delta T cell population, we have studied the V delta 1-J delta 1 junctional sequences from peripheral blood samples of healthy donors. We show that, surprisingly, this repertoire is restricted in most healthy adults, with a donor-specific and relatively stable pattern, whereas this repertoire remains unrestricted in infants, and is similar to that of thymocytes. These data contrast with the general assumpti...

  5. Initial isotopic geochemistry ({delta} 18 O, {delta} D) of fluids from wells of the Los Humeros, Pue., geothermal field; Geoquimica isotopica ({delta} 18 O, {delta} D) inicial de fluidos de pozos del campo geotermico de Los Humeros, Pue.

    Energy Technology Data Exchange (ETDEWEB)

    Barragan Reyes, Rosa Maria; Arellano Gomez, Victor Manuel [Instituto de Investigaciones Electricas, Gerencia de Geotermia, Cuernavaca, Morelos (Mexico)]. E-mail: rmb@iie.org.mx; Ramirez Montes, Miguel; Tovar Aguado, Rigoberto [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Morelia, Michoacan (Mexico)

    2010-01-15

    Isotopic data ({delta} 18 O, {delta} D) from fluids from production wells at the Los Humeros, Pue., geothermal field were analyzed to investigate the possible origin of these fluids and the dominant processes of the reservoir at its initial state. According to pre-exploitation data, it is suggested the Los Humeros reservoir fluids are made of a mixture of meteoric water of very light isotopic composition (paleo-fluids) and andesitic water. The relationship {delta} D vs {delta} 18 O from pre-exploitation data indicates the produced fluids are composed of a mixture of (at least) two fluids with distinct isotopic compositions. At the more enriched end of the mixing relationship are the isotopic compositions of the wells H-23 and H-18 (located in the southern area of the field), while the lighter fluids were found in well H-16 (originally) and then in well H-16 (repaired). It was found that the liquid phases of deep wells are more enriched in {delta} 18 O while the shallow wells present lower values, suggesting a convection process at the initial state. Based on this isotopic profile, it is considered that even the production depths of the wells H-1, H-12 and H-16 (repaired) are just about the same, but their respective isotopic compositions are quite different. The {delta} 18 O value for well H-16 (repaired) seems to be that of condensate steam, while the corresponding values for wells H-1 and H-12 fall within the value interval of the deep wells (H-23). This suggests wells H-1 and H-12 are collecting very deep fluids enriched in {delta} 18 O. These results could be useful in creating a conceptual model of the reservoir. [Spanish] Se analizaron datos isotopicos ({delta}18 O, {delta}D) de los fluidos de pozos productores del campo geotermico de Los Humeros, Pue., para investigar el posible origen de los fluidos asi como los procesos dominantes del yacimiento en su estado inicial. De acuerdo con datos previos a la explotacion, se plantea que los fluidos del yacimiento

  6. Structural Insights into Clostridium perfringens Delta Toxin Pore Formation.

    Directory of Open Access Journals (Sweden)

    Jessica Huyet

    Full Text Available Clostridium perfringens Delta toxin is one of the three hemolysin-like proteins produced by C. perfringens type C and possibly type B strains. One of the others, NetB, has been shown to be the major cause of Avian Nectrotic Enteritis, which following the reduction in use of antibiotics as growth promoters, has become an emerging disease of industrial poultry. Delta toxin itself is cytotoxic to the wide range of human and animal macrophages and platelets that present GM2 ganglioside on their membranes. It has sequence similarity with Staphylococcus aureus β-pore forming toxins and is expected to heptamerize and form pores in the lipid bilayer of host cell membranes. Nevertheless, its exact mode of action remains undetermined. Here we report the 2.4 Å crystal structure of monomeric Delta toxin. The superposition of this structure with the structure of the phospholipid-bound F component of S. aureus leucocidin (LukF revealed that the glycerol molecules bound to Delta toxin and the phospholipids in LukF are accommodated in the same hydrophobic clefts, corresponding to where the toxin is expected to latch onto the membrane, though the binding sites show significant differences. From structure-based sequence alignment with the known structure of staphylococcal α-hemolysin, a model of the Delta toxin pore form has been built. Using electron microscopy, we have validated our model and characterized the Delta toxin pore on liposomes. These results highlight both similarities and differences in the mechanism of Delta toxin (and by extension NetB cytotoxicity from that of the staphylococcal pore-forming toxins.

  7. Functional modulation of human delta opioid receptor by neuropeptide FF

    Directory of Open Access Journals (Sweden)

    Panula Pertti

    2005-04-01

    Full Text Available Abstract Background Neuropeptide FF (NPFF plays a role in physiological pain sensation and opioid analgesia. For example, NPFF potentiates opiate-induced analgesia and the delta opioid receptor antagonist naltrindole inhibits NPFF-induced antinociception. The nature of the interactions between NPFF and opioid receptors seems to be complex and the molecular mechanisms behind the observed physiological effects are not known. Results We used a stable Chinese hamster ovary cell line expressing c-MYC-tagged human delta opioid receptor to study the interactions at the molecular level. Our results imply that NPFF can directly modulate the activation of delta opioid receptor in the absence of NPFF receptors. The modulatory effect, though only moderate, was consistently detected with several methods. The agonist-induced receptor trafficking was changed in the presence of (1DMeNPYF, a stable NPFF-analogue. (1DMeNPYF enhanced the receptor activation and recovery; opioid antagonists inhibited the effects, indicating that they were delta opioid receptor-mediated. The binding experiments with a novel ligand, Terbium-labeled deltorphin I, showed that (1DMeNPYF modulated the binding of delta opioid receptor ligands. The levels of phosphorylated mitogen-activated protein kinase and intracellular cAMP were studied to clarify the effects of NPFF on the opioid signaling mechanisms. Application of (1DMeNPYF together with a delta opioid receptor agonist enhanced the signaling via both pathways studied. Concomitantly to the receptor trafficking, the time-course of the activation of the signaling was altered. Conclusion In addition to working via indirect mechanisms on the opioid systems, NPFF may exert a direct modulatory effect on the delta opioid receptor. NPFF may be a multi-functional neuropeptide that regulates several neuronal systems depending on the site of action.

  8. CARACTERIZAÇÃO MORFOLÓGICA DO DELTA DO RIO DOCE (ES COM BASE EM ANÁLISE MULTISSENSOR / Morphological characterization of the Doce River Delta (ES based on multisensor analysis

    Directory of Open Access Journals (Sweden)

    Silvia Palotti Polizel

    2014-08-01

    Full Text Available A costa leste brasileira apresenta uma sucessão de sistemas deltaicos, sendo o delta do rio Doce, localizado no Estado do Espírito Santo, um dos mais expressivos. A progradação principal deste delta, de geometria cuspidada típica de deltas de onda, tem sido atribuída à queda do nível do mar que se seguiu à transgressão holocênica média. Análises preliminares de novos produtos de sensoriamento remoto disponibilizados nesses últimos anos mostraram o potencial de aprimoramento do mapa geomorfológico desse delta, que pode contribuir para a melhor reconstituição paleoambiental e evolução desse sistema deposicional. Assim, este trabalho teve por objetivo fornecer um mapa geomorfológico detalhado para a planície costeira do rio Doce com base em dados multissensores integrando Modelo Digital de Elevação (MDE do Shuttle Radar Topography Mission (SRTM, Phased Array type L-band Synthetic Aperture Radar (PALSAR do Advanced Land Observing Satellite (ALOS, imagens TM/Landsat, além de imagens óticas de alta resolução extraídas do Google EarthTM. O mapeamento geomorfológico feito por interpretação visual resultou no estabelecimento de seis classes principais, designadas de: 1 drenagem atual; 2 cordão litorâneo/spit; 3 paleocanal; 4 planície interdistributária; 5 flúvio-estuarino/lagunar/marinho raso; e 6 terraço fluvial. De maneira geral, o emprego combinado dos produtos de sensoriamento produziu resultados satisfatórios para a separação dessas classes. O MDE-SRTM contribuiu para a identificação somente da classe paleocanais. As imagens PALSAR foram úteis na identificação das classes cordão litorâneo/spit, paleocanal, flúvio-estuarino/lagunar/marinho raso e terraço fluvial. As imagens TM/Landsat possibilitaram o reconhecimento das classes drenagem atual, cordão litorâneo/spit, planície interdistributária e flúvio-estuarino/lagunar/marinho raso. O mapa geomorfológico contribuiu na caracterização mais

  9. Mississippi Delta, Radar Image with Colored Height

    Science.gov (United States)

    2005-01-01

    [figure removed for brevity, see original site] Click on the image for the animation About the animation: This simulated view of the potential effects of storm surge flooding on Lake Pontchartrain and the New Orleans area was generated with data from the Shuttle Radar Topography Mission. Although it is protected by levees and sea walls against storm surges of 18 to 20 feet, much of the city is below sea level, and flooding due to storm surges caused by major hurricanes is a concern. The animation shows regions that, if unprotected, would be inundated with water. The animation depicts flooding in one-meter increments. About the image: The geography of the New Orleans and Mississippi delta region is well shown in this radar image from the Shuttle Radar Topography Mission. In this image, bright areas show regions of high radar reflectivity, such as from urban areas, and elevations have been coded in color using height data also from the mission. Dark green colors indicate low elevations, rising through yellow and tan, to white at the highest elevations. New Orleans is situated along the southern shore of Lake Pontchartrain, the large, roughly circular lake near the center of the image. The line spanning the lake is the Lake Pontchartrain Causeway, the world's longest over water highway bridge. Major portions of the city of New Orleans are below sea level, and although it is protected by levees and sea walls, flooding during storm surges associated with major hurricanes is a significant concern. Data used in this image were acquired by the Shuttle Radar Topography Mission aboard the Space Shuttle Endeavour, launched on Feb. 11, 2000. The mission used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar that flew twice on the Space Shuttle Endeavour in 1994. The Shuttle Radar Topography Mission was designed to collect 3-D measurements of the Earth's surface. To collect the 3-D data, engineers added a 60-meter

  10. Isolation and characterization of delta toxin from the venom of Crotalus durissus terrificus

    International Nuclear Information System (INIS)

    The Crotalus durissus terrificus venom has been so far described as being of low complexity, with four major components described: convulxin, gyroxin, crotoxin and crotamine. In recent studies, other components of this venom were characterized as, for example, an analgesic factor. In 1980, Vital Brazil predicted the existence of a toxin which could be involved in platelet aggregation, and named it delta toxin. However, this toxin has never been isolated or characterized. The aim of the present work was to purify and characterize this toxin. After FPLC size exclusion chromatography followed by reverse phase HPLC, an homogeneous fraction was obtained, with a molecular weight of 14,074.92 Da. When analyzed by SOS-PAGE, this toxin presented an anomalous behavior, with a molecular weight of 14 kDa, while in 2D gels, spots around 40 kDa and with an isoelectrical point between 4 and 5 were observed suggesting isoforms with glicosilation microheterogeneity. After trypsin digestion, the fragments were submitted to the swissprot databank showing high homology (43% coverage, 15 matching peptides) with trocarin, a prothrombin activator from Tropidechis carinatus. These data were further confirmed by aminoacid analysis. The toxin was tested for its ability to activate factor II and X using synthetic substrates. Our data indicate a direct activation of factor X. The same toxin also behaved as a potent direct platelet aggregation activator on washed platelets. Assays with specific inhibitors indicate that neither metalloproteinase, nor serinoproteinase or t lectin domains are involved in the aggregating activity, since EDTA, benzamidin and D-galactose did not inhibit the toxin. In the present work, we were able to identify, purify and characterize a new toxin from the brazilian rattlesnake. It behaved as predicted by Vital-Brazil and displayed direct factor X activating properties, also inducing platelet aggregation, even at low concentrations. Our data also indicate that it is

  11. Hydrology and morphology of two river mouth regions (temperate Vistula Delta and subtropical Red River Delta

    Directory of Open Access Journals (Sweden)

    Zbigniew Pruszak

    2005-09-01

    Full Text Available The paper presents a comparative analysis of two different river mouths from two different geographical zones (subtropical and temperate climatic regions. One is the multi-branch and multi-spit mouth of the Red River on the Gulf of Tonkin (Vietnam, the other is the smaller delta of the river Vistula on a bay of the Baltic Sea (Poland. The analysis focuses on the similarities and differences in the hydrodynamics between these estuaries and the adjacent coastal zones, the features of sediment transport, and the long-term morphodynamics of the river outlets. Salinity and water level are also discussed, the latter also in the context of the anticipated global effect of accelerated sea level rise. The analysis shows that the climatic and environmental conditions associated with geographical zones give rise to fundamental differences in the generation and dynamic evolution of the river mouths.

  12. Preparing the Dutch delta for future droughts: model based support in the national Delta Programme

    Science.gov (United States)

    ter Maat, Judith; Haasnoot, Marjolijn; van der Vat, Marnix; Hunink, Joachim; Prinsen, Geert; Visser, Martijn

    2014-05-01

    Keywords: uncertainty, policymaking, adaptive policies, fresh water management, droughts, Netherlands, Dutch Deltaprogramme, physically-based complex model, theory-motivated meta-model To prepare the Dutch Delta for future droughts and water scarcity, a nation-wide 4-year project, called Delta Programme, is established to assess impacts of climate scenarios and socio-economic developments and to explore policy options. The results should contribute to a national adaptive plan that is able to adapt to future uncertain conditions, if necessary. For this purpose, we followed a model-based step-wise approach, wherein both physically-based complex models and theory-motivated meta-models were used. First step (2010-2011) was to make a quantitative problem description. This involved a sensitivity analysis of the water system for drought situations under current and future conditions. The comprehensive Dutch national hydrological instrument was used for this purpose and further developed. Secondly (2011-2012) our main focus was on making an inventory of potential actions together with stakeholders. We assessed efficacy, sell-by date of actions, and reassessed vulnerabilities and opportunities for the future water supply system if actions were (not) taken. A rapid assessment meta-model was made based on the complex model. The effects of all potential measures were included in the tool. Thirdly (2012-2013), with support of the rapid assessment model, we assessed the efficacy of policy actions over time for an ensemble of possible futures including sea level rise and climate and land use change. Last step (2013-2014) involves the selection of preferred actions from a set of promising actions that meet the defined objectives. These actions are all modeled and evaluated using the complex model. The outcome of the process will be an adaptive management plan. The adaptive plan describes a set of preferred policy pathways - sequences of policy actions - to achieve targets under

  13. GERONTOLOGIA: ESTADO DA ARTE

    Directory of Open Access Journals (Sweden)

    Vera M.A.Tordino Brandão

    2010-02-01

    Full Text Available O Programa de Gerontologia da PUC desenvolve pesquisas focando o ser na perspectiva do envelhecimento. As atividades são interdisciplinares e reúnem docentes, alunos e ex-alunos. Nesta mesa redonda apresentamos um panorama sobre estes estudos. Na área da educação e comunicação o foco está centrado na longevidade e na preparação e representação social da velhice. São ressaltadas como temáticas: a formação continuada de profissionais e pesquisadores; o significado da religiosidade/espiritualidade ao longo da trajetória, e sua repercussão na qualidade de vida do idoso; os programas sócio-educacionais para idosos e concepções sobre educação; o monitoramento da mídia na cobertura da crescente longevidade e seus impactos. Em identidade e modos de morar reflete-se sobre soluções planejadas e sua adequação para a inclusão do envelhecimento populacional como questão fundamental, que implica a elaboração de novas políticas, investigações e, especialmente, apresenta-se como questão a ser analisada, refletida e vivenciada pela sociedade em geral. Quanto à saúde, o Programa desenvolve várias pesquisas numa abordagem interdisciplinar tendo como objetos de estudo: a terapia assistida com animais direcionada a idosos com diagnóstico de Alzheimer; o acompanhamento terapêutico e o atendimento psicoterapêutico em grupo, a aplicação da técnica de Calatonia em idosos moradores de ILPI, além da investigação sobre impasses clínicos no idoso frágil. Palavras-chave: gerontologia, longevidade, envelhecimento

  14. The case for selection at CCR5-Delta32.

    Directory of Open Access Journals (Sweden)

    Pardis C Sabeti

    2005-11-01

    Full Text Available The C-C chemokine receptor 5, 32 base-pair deletion (CCR5-Delta32 allele confers strong resistance to infection by the AIDS virus HIV. Previous studies have suggested that CCR5-Delta32 arose within the past 1,000 y and rose to its present high frequency (5%-14% in Europe as a result of strong positive selection, perhaps by such selective agents as the bubonic plague or smallpox during the Middle Ages. This hypothesis was based on several lines of evidence, including the absence of the allele outside of Europe and long-range linkage disequilibrium at the locus. We reevaluated this evidence with the benefit of much denser genetic maps and extensive control data. We find that the pattern of genetic variation at CCR5-Delta32 does not stand out as exceptional relative to other loci across the genome. Moreover using newer genetic maps, we estimated that the CCR5-Delta32 allele is likely to have arisen more than 5,000 y ago. While such results can not rule out the possibility that some selection may have occurred at C-C chemokine receptor 5 (CCR5, they imply that the pattern of genetic variation seen at CCR5-Delta32 is consistent with neutral evolution. More broadly, the results have general implications for the design of future studies to detect the signs of positive selection in the human genome.

  15. Analysis of Marketing of Garri in Delta State, Nigeria

    Institute of Scientific and Technical Information of China (English)

    Ebewore S O; Idoge D E

    2015-01-01

    The study examined the marketing of a cassava-based product (garri) in Delta State, Nigeria. Data was collected from 168 respondents using structured questionnaire. A multi-stage sampling procedure was employed in selecting 168 respondents from six markets in Delta State where garri is produced and marketed. Data was analyzed by the calculation of percentages, means and running of regression. The study revealed that the marketing of garri in Delta State was predominantly a female activity. The study also revealed that the garri was marketed in three channels and that 46.4% were retailers. The study further revealed a reasonable degree of freedom of entry and exit in the garri business in Delta State. Each trader or marketer was able to earn an average profit margin of N2 190.00 (for garri marketers), while the marketing margins for garri was 13.1%. Although the marketers were faced with some challenges the average profit per marketer per month was reasonably high (N40 722). The study further showed that the socio-economic characteristics of the marketers to a large extent had a positive influence on the quantity of garri sold in the study area. From the findings it was recommended that storage facilities, extension services and good road network among others should be provided to improve the marketing of garri in Delta State, Nigeria.

  16. The case for selection at CCR5-Delta32.

    Directory of Open Access Journals (Sweden)

    2005-11-01

    Full Text Available The C-C chemokine receptor 5, 32 base-pair deletion (CCR5-Delta32 allele confers strong resistance to infection by the AIDS virus HIV. Previous studies have suggested that CCR5-Delta32 arose within the past 1,000 y and rose to its present high frequency (5%-14% in Europe as a result of strong positive selection, perhaps by such selective agents as the bubonic plague or smallpox during the Middle Ages. This hypothesis was based on several lines of evidence, including the absence of the allele outside of Europe and long-range linkage disequilibrium at the locus. We reevaluated this evidence with the benefit of much denser genetic maps and extensive control data. We find that the pattern of genetic variation at CCR5-Delta32 does not stand out as exceptional relative to other loci across the genome. Moreover using newer genetic maps, we estimated that the CCR5-Delta32 allele is likely to have arisen more than 5,000 y ago. While such results can not rule out the possibility that some selection may have occurred at C-C chemokine receptor 5 (CCR5, they imply that the pattern of genetic variation seen atCCR5-Delta32 is consistent with neutral evolution. More broadly, the results have general implications for the design of future studies to detect the signs of positive selection in the human genome.

  17. EFFECTS OF SEDIMENT GRADATION ON THE GEOMETRY OF RIVER DELTAS

    Institute of Scientific and Technical Information of China (English)

    Chjeng-Lun SHIEH; Chih-Ming TSENG; Shaohua Marko HSU

    2001-01-01

    A series of laboratory experiments were conducted to evaluate the influence of the size-distribution of sediments on the formation and geometry of alluvial deltas. In the previous studies by the first author,only coarse sediments, which move under bed-load conditions, were used as the testing material. In this study, mixing fine grain materials into the experimental sediments created certain suspended load.Results of the new experiments show significant differences in the geometry of deltas as a consequence of incorporating the suspended load. Dimensionless plots for different geometrical parameters show that the geometry of the deltas, normalized by several selected characteristic lengths, is still independent of the size-distributions of sediments. The plane geometry of the deltas can still be described by a Gaussian function as in the previous studies. In addition, transverse and longitudinal profiles can also be fitted by the hyperbolic and linear functions, respectively. Based on this analysis, however, the distribution coefficients of the functions mentioned above vary with the grain size distributions, which will be a sound indicator of the quantitative classification for alluvial deltas.

  18. Exact solution for a quantum field with delta-like interaction effective action and UV renormalization

    CERN Document Server

    Solodukhin, S N

    1999-01-01

    A quantum field described by the field operator $\\Delta_{\\bf a}=\\Delta+{\\bf a}\\delta_\\Sigma$ involving a $\\delta$-like potential is considered. Mathematically, the treatment of the $\\delta$-potential is based on the theory of self-adjoint extension of the unperturbed operator $\\Delta$. We give the general expressions for the resolvent and the heat kernel of the perturbed operator $\\Delta_{\\bf a}$. The main attention is payed to $d=2$ We calculate exactly the heat kernel, Green's functions and the effective action for the operator $\\Delta_{\\bf a}$ in diverse dimensions and for various spaces $\\Sigma$. The renormalization phenomenon for the coupling constant $\\bf a$ of $d=2$ and $d=3$ $\\delta$-potentials is observed. We find the non-perturbative behavior of the effective action with respect to the renormalized coupling ${\\bf a}_{ren}$.

  19. A cultura da imagem

    OpenAIRE

    José Tavares de Barros

    2009-01-01

    O artigo situa no contexto da cultura contemporânea os desafios dos meios de comunicação social, especialmente da mídia eletrônica. Identifica as dimensões do sagrado e do mistério na própria natureza das imagens, oferecendo subsídios para o exercício da leitura crítica das narrativas audiovisuais.Palavras-chave: Imagem; Cultura; Imaginação; Sagrado; Mídia; Linguagem.ABSTRACTThis article considers the challenges of social communication media within the context of contemporary culture, mainly ...

  20. Nonisothermal transport properties of alpha-Ag2 + deltaS : Partial thermopowers of electrons and ions, the soret effect and heats of transport

    OpenAIRE

    Korte, Carsten; Janek, Jürgen

    1997-01-01

    The ionic and electronic partial thermopowers and the Soret effect of alpha-Ag2 + deltaS (low temperature phase) have been studied as functions of temperature and deviation from stoichiometry delta by means of a nonisothermal galvanic cell. From a combination of these data with results from additional measurements of the partial entropy of silver metal in alpha-Ag2 + deltaS, the heat of transport of silver metal is determined. The measured transport properties are discussed in respect to the ...

  1. Ancient Martian Deltas: Evidence for Shallow and Deep Standing Bodies of Water

    Science.gov (United States)

    Jew, C. L.; Kim, W.; Lim, Y.; Piliouras, A.

    2015-12-01

    Ancient deltas on Mars are indicative of a geologic history composed of complex fluvio-deltaic deposits. We focus on two morphologically different deltas preserved on Mars, one located in the Jezero crater and the other in the Shalbatana Valles canyon. The Jezero delta, formed during the Noachian age, is a large fluvial delta with strong channelization and a rigid shoreline resembling a terrestrial delta. In contrast, the Shalbatana Delta is a smaller scaled more briefly lived delta system, developed during the Hesperian, that is characterized by its smooth and simple planform. Evidence from previous studies on these Martian deltas such as the base level, mechanism to build sediment cohesion, estimated discharge, and time of formation offer support to ultimately discover why one delta drastically differs from the other. Based upon the observations from these two locations, we investigate through our physical experiments the conditions required to create these prograding deltas. We use carbonate precipitation in our experiments as a mechanism to increase bank stability, an alternative for any chemically driven precipitated deposits that potentially improve cohesion as vegetation does for terrestrial deltas. We found that there are differences in floodplain thickness, channelization, shoreline rugosity, and delta shape in the carbonate verse non-carbonate runs. Additionally, we conducted runs for isolating the influence that shallow and deep standing bodies of water have on prograding deltas. The experimental results suggested that the highly channelized delta (e.g., Jezero delta) rapidly prograded into a shallow body of water, covering a broader surface area and is dependent on a cohesive force for channel organization. On the contrary, Gilbert-type delta (e.g., Shalbatana delta) was best replicated when prograding into a deep standing body of water. Investigation using the experimental carbonate deltas suggests that cohesion results in better channelization (more

  2. Lepton Mixing Predictions from Delta(6n^2) Family Symmetry

    CERN Document Server

    King, Stephen F; Stuart, Alexander J

    2013-01-01

    We obtain predictions of lepton mixing parameters for direct models based on Delta(6n^2) family symmetry groups for arbitrarily large n in which the full Klein symmetry is identified as a subgroup of the family symmetry. After reviewing and developing the group theory associated with Delta(6n^2), we find many new candidates for large n able to yield reactor angle predictions within 3 sigma of recent global fits. We show that such Delta(6n^2) models with Majorana neutrinos predict trimaximal mixing with reactor angle theta_{13} fixed up to a discrete choice, an oscillation phase of either zero or pi and the atmospheric angle sum rules theta_{23}=45 degrees -/+ theta_{13}/sqrt{2}, respectively, which are consistent with recent global fits and will be tested in the near future.

  3. Morphology of river deltas on Titan and Earth

    Science.gov (United States)

    Witek, Piotr; Czechowski, Leszek

    2016-07-01

    The Cassini-Huygens mission is entering its final phase. The landing of Huygens on Titan and flybys performed by the Cassini probe during the last ten years revolutionized our knowledge about that moon, revealing a complex fluvio-lacustrine environment. Despite significant differences in composition, temperature and gravity, the processes of sediment transport and deposition are similar on Earth and Titan. We performed numerical simulations of development of river deltas in Titanian and terrestrial conditions, under various discharges and with different dominant grain sizes. We found that evolution of deltaic deposits is more rapid on Titan due to higher efficiency of transport, but the flat, lobate river deltas may form in narrower range of parameters than on Earth. Our results help in understanding the evolution of sedimentary deposits and may partially explain the paucity of river deltas in Titan's lakes.

  4. $\\Delta^{++}$ resonance measurements in a high multiplicity environment

    CERN Document Server

    El Chenawi, Karim

    1999-01-01

    The very large multiplicity of charged particles encountered in lead on lead collisions in the WA98 experiment at the CERN SPS provided new experimental challenges. Tracking detectors read out with high granularity were developed to achieve accurate position information in two dimensions, with the aim of reconstructing tracks with a minimum of combinatorial difficulties. A tracking system based on multi-step avalanche chambers equipped with a new electronic readout system was developed and implemented in the experiment during 1996. The different aspects of the tracking system and its performance are described. The extraction of the $\\Delta\\sp{++}$ resonance from high statistics, high multiplicity samples of FRITIOF events has been studied in order to find a reliable method to reconstruct the number of produced $\\Delta\\sp{++}$. The first measurement on $\\Delta\\sp{++}$ production in 158 A GeV Pb$+$Pb collisions, using the high resolution tracking system in WA98 is presented.

  5. Sliding mode control the delta-sigma modulation approach

    CERN Document Server

    Sira-Ramírez, Hebertt

    2015-01-01

    This monograph presents a novel method of sliding mode control for switch-regulated nonlinear systems. The Delta Sigma modulation approach allows one to implement a continuous control scheme using one or multiple, independent switches, thus effectively merging the available linear and nonlinear controller design techniques with sliding mode control.   Sliding Mode Control: The Delta-Sigma Modulation Approach, combines rigorous mathematical derivation of the unique features of Sliding Mode Control and Delta-Sigma modulation with numerous illustrative examples from diverse areas of engineering. In addition, engineering case studies demonstrate the applicability of the technique and the ease with which one can implement the exposed results. This book will appeal to researchers in control engineering and can be used as graduate-level textbook for a first course on sliding mode control.

  6. Hepatitis delta virus: A fascinating and neglected pathogen.

    Science.gov (United States)

    Cunha, Celso; Tavanez, João Paulo; Gudima, Severin

    2015-11-12

    Hepatitis delta virus (HDV) is the etiologic agent of the most severe form of virus hepatitis in humans. Sharing some structural and functional properties with plant viroids, the HDV RNA contains a single open reading frame coding for the only virus protein, the Delta antigen. A number of unique features, including ribozyme activity, RNA editing, rolling-circle RNA replication, and redirection for a RNA template of host DNA-dependent RNA polymerase II, make this small pathogen an excellent model to study virus-cell interactions and RNA biology. Treatment options for chronic hepatitis Delta are scarce and ineffective. The disease burden is perhaps largely underestimated making the search for new, specific drugs, targets, and treatment strategies an important public health challenge. In this review we address the main features of virus structure, replication, and interaction with the host. Virus pathogenicity and current treatment options are discussed in the light of recent developments. PMID:26568914

  7. Nigeria. Petroleum, pollution and poverty in the Niger Delta

    International Nuclear Information System (INIS)

    The oil industry has operated in the Niger Delta in Nigeria for more than half a century - bringing almost no benefit to the people living there. Instead, widespread and unchecked human rights violations have pushed many people deeper into poverty and deprivation, fuelled conflict and led to a pervasive sense of powerlessness and frustration. This multidimensional crisis is driven by many factors - abuses committed by the security forces and militant groups, extensive pollution of land and water, corruption, serious corporate bad practice and government neglect. Nigeria: Petroleum, pollution and poverty in the Niger Delta focuses on one dimension of the crisis: the impact of pollution and environmental damage caused by the oil industry on the human rights of those living in the Niger Delta. Many people in the oil-producing areas of the delta rely on fisheries, subsistence agriculture and associated processing industries for their livelihood. Decades of pollution and environmental damage have resulted in violations of the right to an adequate standard of living - including food and water - violations of the right to gain a living through work, and violations of the right to health. The report examines who is responsible for this situation in a context where multinational oil companies have been operating for decades. It highlights how companies take advantage of the weak regulatory systems that characterize many poor countries, and how the poorest people are often the most vulnerable to exploitation. The people of the Niger Delta have seen their human rights undermined by oil companies that their government can not - or will not - hold to account. They have been systematically denied access to information about how oil exploration and production will affect them, and are repeatedly denied access to justice. The Niger Delta provides a stark case study of the lack of accountability of a government to the people, and of multinational companies' almost total lack of

  8. Salinity Impacts on Agriculture and Groundwater in Delta Regions

    Science.gov (United States)

    Clarke, D.; Salehin, M.; Jairuddin, M.; Saleh, A. F. M.; Rahman, M. M.; Parks, K. E.; Haque, M. A.; Lázár, A. N.; Payo, A.

    2015-12-01

    Delta regions are attractive for high intensity agriculture due to the availability of rich sedimentary soils and of fresh water. Many of the world's tropical deltas support high population densities which are reliant on irrigated agriculture. However environmental changes such as sea level rise, tidal inundation and reduced river flows have reduced the quantity and quality of water available for successful agriculture. Additionally, anthropogenic influences such as the over abstraction of ground water and the increased use of low quality water from river inlets has resulted in the accumulation of salts in the soils which diminishes crop productivity. Communities based in these regions are usually reliant on the same water for drinking and cooking because surface water is frequently contaminated by commercial and urban pollution. The expansion of shallow tube well systems for drinking water and agricultural use over the last few decades has resulted in mobilisation of salinity in the coastal and estuarine fringes. Sustainable development in delta regions is becoming constrained by water salinity. However salinity is often studied as an independent issue by specialists working in the fields of agriculture, community water supply and groundwater. The lack of interaction between these disciplines often results in corrective actions being applied to one sector without fully assessing the effects of these actions on other sectors. This paper describes a framework for indentifying the causes and impacts of salinity in delta regions based on the source-pathway-receptor framework. It uses examples and scenarios from the Ganges-Brahmaputra-Meghna delta in Bangladesh together with field measurements and observations made in vulnerable coastal communities. The paper demonstrates the importance of creating an holistic understanding of the development and management of water resources to reduce the impact of salinity in fresh water in delta regions.

  9. Nigeria. Petroleum, pollution and poverty in the Niger Delta

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2009-06-15

    The oil industry has operated in the Niger Delta in Nigeria for more than half a century - bringing almost no benefit to the people living there. Instead, widespread and unchecked human rights violations have pushed many people deeper into poverty and deprivation, fuelled conflict and led to a pervasive sense of powerlessness and frustration. This multidimensional crisis is driven by many factors - abuses committed by the security forces and militant groups, extensive pollution of land and water, corruption, serious corporate bad practice and government neglect. Nigeria: Petroleum, pollution and poverty in the Niger Delta focuses on one dimension of the crisis: the impact of pollution and environmental damage caused by the oil industry on the human rights of those living in the Niger Delta. Many people in the oil-producing areas of the delta rely on fisheries, subsistence agriculture and associated processing industries for their livelihood. Decades of pollution and environmental damage have resulted in violations of the right to an adequate standard of living - including food and water - violations of the right to gain a living through work, and violations of the right to health. The report examines who is responsible for this situation in a context where multinational oil companies have been operating for decades. It highlights how companies take advantage of the weak regulatory systems that characterize many poor countries, and how the poorest people are often the most vulnerable to exploitation. The people of the Niger Delta have seen their human rights undermined by oil companies that their government can not - or will not - hold to account. They have been systematically denied access to information about how oil exploration and production will affect them, and are repeatedly denied access to justice. The Niger Delta provides a stark case study of the lack of accountability of a government to the people, and of multinational companies' almost total lack

  10. Structure of the [delta]-opioid receptor bound to naltrindole

    Energy Technology Data Exchange (ETDEWEB)

    Granier, Sébastien; Manglik, Aashish; Kruse, Andrew C.; Kobilka, Tong Sun; Thian, Foon Sun; Weis, William I.; Kobilka, Brian K. (Stanford-MED)

    2012-07-11

    The opioid receptor family comprises three members, the {mu}-, {delta}- and {kappa}-opioid receptors, which respond to classical opioid alkaloids such as morphine and heroin as well as to endogenous peptide ligands like endorphins. They belong to the G-protein-coupled receptor (GPCR) superfamily, and are excellent therapeutic targets for pain control. The {delta}-opioid receptor ({delta}-OR) has a role in analgesia, as well as in other neurological functions that remain poorly understood. The structures of the {mu}-OR and {kappa}-OR have recently been solved. Here we report the crystal structure of the mouse {delta}-OR, bound to the subtype-selective antagonist naltrindole. Together with the structures of the {mu}-OR and {kappa}-OR, the {delta}-OR structure provides insights into conserved elements of opioid ligand recognition while also revealing structural features associated with ligand-subtype selectivity. The binding pocket of opioid receptors can be divided into two distinct regions. Whereas the lower part of this pocket is highly conserved among opioid receptors, the upper part contains divergent residues that confer subtype selectivity. This provides a structural explanation and validation for the 'message-address' model of opioid receptor pharmacology, in which distinct 'message' (efficacy) and 'address' (selectivity) determinants are contained within a single ligand. Comparison of the address region of the {delta}-OR with other GPCRs reveals that this structural organization may be a more general phenomenon, extending to other GPCR families as well.

  11. Flebectasia da Jugular Externa

    OpenAIRE

    Lopes, C; Manaças, R; F. Tavares; Marques da Costa

    1990-01-01

    A flebectasia da jugular externa é uma entidade nosológica rara, sendo escassas as descrições na literatura mundial. Clinicamente apresenta-se como uma massa cervical de aparecimento ou alargamento durante a manobra de Valsalva. Os autores descrevem um caso clínico, salientando as possibilidades da TC (Tomografia Computorizada) num diagnóstico etiológico e topográfico preciso, sem o recurso a outros meios invasivos.

  12. Functional analysis and localisation of a delta-class glutathione S-transferase from Sarcoptes scabiei.

    Science.gov (United States)

    Pettersson, Eva U; Ljunggren, Erland L; Morrison, David A; Mattsson, Jens G

    2005-01-01

    The mite Sarcoptes scabiei causes sarcoptic mange, or scabies, a disease that affects both animals and humans worldwide. Our interest in S. scabiei led us to further characterise a glutathione S-transferase. This multifunctional enzyme is a target for vaccine and drug development in several parasitic diseases. The S. scabiei glutathione S-transferase open reading frame reported here is 684 nucleotides long and yields a protein with a predicted molecular mass of 26 kDa. Through phylogenetic analysis the enzyme was classified as a delta-class glutathione S-transferase, and our paper is the first to report that delta-class glutathione S-transferases occur in organisms other than insects. The recombinant S. scabiei glutathione S-transferase was expressed in Escherichia coli via three different constructs and purified for biochemical analysis. The S. scabiei glutathione S-transferase was active towards the substrate 1-chloro-2,4-dinitrobenzene, though the positioning of fusion partners influenced the kinetic activity of the enzyme. Polyclonal antibodies raised against S. scabiei glutathione S-transferase specifically localised the enzyme to the integument of the epidermis and cavities surrounding internal organs in adult parasites. However, some minor staining of parasite intestines was observed. No staining was seen in host tissues, nor could we detect any antibody response against S. scabiei glutathione S-transferase in sera from naturally S. scabiei infected dogs or pigs. Additionally, the polyclonal sera raised against recombinant S. scabiei glutathione S-transferase readily detected a protein from mites, corresponding to the predicted size of native glutathione S-transferase. PMID:15619514

  13. Holocene sand shoals offshore of Mississippi River delta plain, Louisiana

    Energy Technology Data Exchange (ETDEWEB)

    Penland, S.; McBride, R.A. (Louisiana Geological Survey, Baton Rouge (USA)); Suter, J.R. (Exxon Production Research, Houston, TX (USA)); Williams, S.J. (Geological Survey, Reston, VA (USA)); Kindinger, J.L. (Geological Survey, St. Petersburg, FL (USA)); Boyd, R. (Dalhousie Univ., Halifax, Nova Scotia (Canada))

    1989-09-01

    Offshore of the Mississippi River delta plain lies a series of Holocene sand shoals marking the position of ancient submerged shorelines. These ancient shorelines represent stillstand positions during which the Holocene transgression drove sea level across the former lowstand subaerial erosion surface of the Mississippi River delta plain. Short periods of rapid sea level rise led to the transgressive submergence of these sandy shorelines. Two shoreline trends can be recognized at the {minus}10-m and {minus}20-m isobaths on the continental shelf.

  14. Holocene sand shoals offshore of the Mississippi River delta plain

    Science.gov (United States)

    Penland, Shea; Suter, John R.; McBride, Randolph A.; Williams, S. Jeffress; Kindinger, Jack G.; Boyd, Ron

    1989-01-01

    Offshore of the Mississippi River delta plain lies a series of Holocene sand shoals marking the position of ancient submerged shorelines associated with younger shelf-phase delta plains. These submerged shorelines represent positions when sea level stood lower than present. Short periods of rapid sea level rise during the Holocene transgression, in combination with subsidence, led to the submergence of these sandy shorelines, which can be recognized at the -33 ft (-10 m) and -66 ft (-20 m) isobaths on the Louisiana continental shelf

  15. A Signal-Interleaving Complex Bandpass Sigma-Delta Converter

    DEFF Research Database (Denmark)

    Wad, Paul Emmanuel

    Complex or quadrature Sigma-Delta converters operate on complex signals, i.e. signals consisting of a real and an imaginary component, whereas conventional converters operate only on real signals. The advantage of complex signal processing in the discrete-time domain is that the entire sampling...... frequency bandwidth - not just half of it - is available, and that network zeros and poles can be placed anywhere without having to appear in complex conjugate pairs. This paper demonstrates how these properties can be used to design complex bandpass Sigma-Delta converters with a better noise performance...

  16. The cylindrical \\delta-potential and the Dirac equation

    OpenAIRE

    Loewe, M.; Marquez, F.; Zamora, R.

    2011-01-01

    In this article we discuss the Dirac equation in the presence of an attractive cylindrical \\delta-shell potential V(\\rho)=-a\\delta(\\rho-\\rho_0), where \\rho is the radial coordinate and a>0. We present a detailed discussion on the boundary conditions the wave function has to satisfy when crossing the support of the potential, proceeding then to explore the dependence of the ground state on the parameter a, analyzing the occurrence of supercritical effects. We also apply the Foldy-Wouthuysen tr...

  17. Mazda kiintotyövaiheiden perustaminen : Delta Auto Oy

    OpenAIRE

    Schreck, Ville

    2012-01-01

    Täyden palvelun autoliikeketju Delta Auto myy ja huoltaa Kia-, Mitsubishi- ja Mazda-merkkisiä autoja paikkakuntakohtaisesti kahdessakymmenessäviidessä toimipisteessä. Opinnäytetyön tarkoituksena oli tehdä toimiva ratkaisu Mazdan työvaiheiden sekä työpakettien myyntiin Automaster-ohjelmistoon. Työvaiheet sekä ohjeajat tulevat käyttöön kaikkiin Delta Auton toimipisteisiin ympäri Suomea. Työn lähdemateriaalin sain Inchcape Motor Finland Oy:ltä, joka toimii Suomessa Mazdan maahantuojana. Tarve tä...

  18. Strategic Thoughts on Economic Integration of Yangtze Delta

    Institute of Scientific and Technical Information of China (English)

    Xu Cong

    2008-01-01

    @@ Importance of integration to China's economy Shanghai,Jiangsu and Zhejiang,the three provinces and cities around Yangtze Delta area,are not only related in geography,but also enjoy similar type of culture and economy.With 2.2%of the national land area.10.4%of national population.the Yangtze Delta has created 22.1%of the national GDP,24.5%of the national fiscal revenues and 28.5%of the total imports and exports in the country.which has already made it become one of the most advanced areas in science,technology and culture in China.

  19. Delta-sigma modulators modeling, design and applications

    CERN Document Server

    Bourdopoulos, George I; Anastassopoulos, Vassilis; Deliyannis, Theodore L

    2003-01-01

    This important book deals with the modeling and design of higher-order single-stage delta-sigma modulators. It provides an overview of the architectures, the quantizer models, the design techniques and the implementation issues encountered in the study of the delta-sigma modulators. A number of applications are discussed, with emphasis on use in the design of analog-to-digital converters and in frequency synthesis. The book is education- rather than research-oriented, containing numerical examples and unsolved problems. It is aimed at introducing the final-year undergraduate, the graduate stud

  20. Feedback Linearization Controller Of The Delta WingRock Phenomena

    Directory of Open Access Journals (Sweden)

    Mohammed Alkandari

    2015-05-01

    Full Text Available This project deals with the control of the wing rock phenomena of a delta wing aircraft. a control schemeis proposed to stabilize the system. The controlleris a feedback linearization controller. It is shown that the proposed control scheme guarantee the asymptotic convergence to zero of all the states of the system. To illustrate the performance of the proposed controller, simulation results are presented and discussed. It is found that the proposed control scheme work well for the wing rock phenomena of a delta wing aircraft.

  1. Surface delta interaction and properties of medium mass nuclei

    International Nuclear Information System (INIS)

    The idea of Surface Delta Interaction (SDI) is that because of Pauli principle, the interaction between nucleons is peaked near the surface of the nucleus. The delta potential is short ranged like free NN interaction. It has some interesting properties which makes it a quite 'realistic' interaction, to use. SDI gives matrix elements which are quite close to empirical matrix elements found from shell model studies. Also this interaction reproduces deformation properties quite well in complex nuclei. Comparison of SDI matrix elements with two modern interactions, namely, JUN45 and G-f5pg9 interaction has been made and report some applications to finite nuclei

  2. CMOS sigma-delta converters practical design guide

    CERN Document Server

    De la Rosa, Jose M

    2013-01-01

    A comprehensive overview of Sigma-Delta Analog-to-Digital Converters (ADCs) and a practical guide to their design in nano-scale CMOS for optimal performance. This book presents a systematic and comprehensive compilation of sigma-delta converter operating principles, the new advances in architectures and circuits, design methodologies and practical considerations - going from system-level specifications to silicon integration, packaging and measurements, with emphasis on nanometer CMOS implementation. The book emphasizes practical design issues - from high-level behavioural modelling i

  3. Integrating Delta Building Physics & Economics: Optimizing the Scale of Engineered Avulsions in the Mississippi River Delta

    Science.gov (United States)

    Kenney, M. A.; Mohrig, D.; Hobbs, B. F.; Parker, G.

    2011-12-01

    Land loss in the Mississippi River Delta caused by subsidence and erosion has resulted in habitat loss, interference with human activities, and increased exposure of New Orleans and other settled areas to storm surge risks. Prior to dam and levee building and oil and gas production in the 20th century, the long term rates of land building roughly balanced land loss through subsidence. Now, however, sediment is being deposited at dramatically lower rates in shallow areas in and adjacent to the Delta, with much of the remaining sediment borne by the Mississippi being lost to the deep areas of the Gulf of Mexico. A few projects have been built in order to divert sediment from the river to areas where land can be built, and many more are under consideration as part of State of Louisiana and Federal planning processes. Most are small scale, although there have been some proposals for large engineered avulsions that would divert a significant fraction of the remaining available sediment (W. Kim, et al. 2009, EOS). However, there is debate over whether small or large diversions are the economically optimally and socially most acceptable size of such land building projects. From an economic point of view, the optimal size involves tradeoffs between scale economies in civil work construction, the relationship between depth of diversion and sediment concentration in river water, effects on navigation, and possible diminishing returns to land building at a single location as the edge of built land progresses into deeper waters. Because land building efforts could potentially involve billions of dollars of investment, it is important to gain as much benefit as possible from those expenditures. We present the result of a general analysis of scale economies in land building from engineered avulsions. The analysis addresses the question: how many projects of what size should be built at what time in order to maximize the amount of land built by a particular time? The analysis

  4. {Delta} decay in nuclei: recent results and perspectives; Decroissance du {Delta} dans les noyaux: resultats recents et perspectives

    Energy Technology Data Exchange (ETDEWEB)

    Ramstein, B.; Tarle-Rousteau, S.; Hennino, T.; Jourdain, J.C.; Roy-Stephan, M.; Zupranki, P. [Centre National de la Recherche Scientifique (CNRS), 91 - Orsay (France); Boyard, J.L.; Morsch, H.P.; Radvanyi, P.; Sams, T.; Spang, W.; Zupraski, P. [Laboratoire National Saturne, Centre d`Etudes de Saclay, 91 - Gif-sur-Yvette (France); Gosset, J.; Lemaire, M.C.; Lhote, D. [CEA Centre d`Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. d`Astrophysique, de la Physique des Particules, de la Physique Nucleaire et de l`Instrumentation Associee; Dahl, R.; Ellegaard, C.; Gaarde, C.; Kagarlis, M.; Larsen, J.S.; Sams, T.; Skousen, M. [Niels Bohr Inst., Copenhagen (Denmark); Osterlund, M. [Lund Univ. (Sweden); Zupranski, P. [Soltan Inst. for Nuclear Studies, Otwock-Swierk (Poland)

    1996-12-31

    We present data on the decay of the {Delta} resonance excited in {sup 1}H, {sup 2}H, {sup 4}He, {sup 12}C and {sup 208}Pb by the (3He, t) reaction at 2 GeV incident energy. The quasi-free decay of the {Delta} resonance and the absorption process are investigated. In addition, we find indication for a coherent process where a pion is emitted and the target nucleus is left in its ground state. This process will be studied with the dedicated set-up Spes4{pi}. The first data with this new detection have just been taken. (author) 27 refs.

  5. Early Evaluation of Compatibility between Commercial Citrus Varieties and Kaffir Lime (Citrus hystrix) and Carrizo Citrange (C. sinensis Osb. x P. trifoliata L. Raf.) Rootstocks at Mekong Delta, Vietnam

    OpenAIRE

    Le Thi Khoe; Tran Van Mi

    2015-01-01

    The results of investigation on early evaluation of compatibility between commercial citrus varieties, and Kaffir lime (Citrus hystrix) and Carrizo citrange (C. sinensis Osb. x P. trifoliata L. Raf.) rootstocks, at Mekong Delta Vietnam, during four successive years from 2010 to 2013, reported that out of the tested combinations of the recent commercial citrus varieties, included Da xanh pumelo (C. grandis Osbeck), seedless Mat orange (C. sinensis L. Osbeck), Sanh orange (C. nobilis Lour.) and...

  6. A bifunctional Delta12,Delta15-desaturase from Acanthamoeba castellanii directs the synthesis of highly unusual n-1 series unsaturated fatty acids.

    Science.gov (United States)

    Sayanova, Olga; Haslam, Richard; Guschina, Irina; Lloyd, David; Christie, William W; Harwood, John L; Napier, Johnathan A

    2006-12-01

    The free-living soil protozoon Acanthamoeba castellanii synthesizes a range of polyunsaturated fatty acids, the balance of which can be altered by environmental changes. We have isolated and functionally characterized in yeast a microsomal desaturase from A. castellanii, which catalyzes the sequential conversion of C(16) and C(18) Delta9-monounsaturated fatty acids to di- and tri-unsaturated forms. In the case of C(16) substrates, this bifunctional A. castellanii Delta12,Delta15-desaturase generated a highly unusual fatty acid, hexadecatrienoic acid (16:3Delta(9,12,15)(n-1)). The identification of a desaturase, which can catalyze the insertion of a double bond between the terminal two carbons of a fatty acid represents a new addition to desaturase functionality and plasticity. We have also co-expressed in yeast the A. castellanii bifunctional Delta12,Delta15-desaturase with a microsomal Delta6-desaturase, resulting in the synthesis of the highly unsaturated C(16) fatty acid hexadecatetraenoic acid (16:4Delta(6,9,12,15)(n-1)), previously only reported in marine microorganisms. Our work therefore demonstrates the feasibility of the heterologous synthesis of polyunsaturated fatty acids of the n-1 series. The presence of a bifunctional Delta12,Delta15-desaturase in A. castellanii is also considered with reference to the evolution of desaturases and the lineage of this protist. PMID:16950768

  7. Changes in the areal extents of the Athabasca River, Birch River, and Cree Creek Deltas, 1950-2014, Peace-Athabasca Delta, Canada

    Science.gov (United States)

    Timoney, Kevin; Lee, Peter

    2016-04-01

    Deltas form where riverborne sediment accumulates at the interface of river mouths and their receiving water bodies. Their areal extent is determined by the net effect of processes that increase their extent, such as sediment accumulation, and processes that decrease their extent, such as erosion and subsidence. Through sequential mapping and construction of river discharge and sediment histories, this study examined changes in the subaerial extents of the Cree Creek and Athabasca River Deltas (both on the Athabasca River system) and the Birch River Delta in northern Canada over the period 1950-2014. The purpose of the study was to determine how, when, and why the deltas changed in areal extent. Temporal growth patterns were similar across the Athabasca and Birch River systems indicative of a climatic signal. Little or no areal growth occurred from 1950 to 1968; moderate growth occurred between 1968 and the early to mid-1980s; and rapid growth occurred between 1992 and 2012. Factors that affected delta progradation included dredging, sediment supply, isostatic drowning, delta front bathymetry, sediment capture efficiency, and storms. In relation to sediment delivered, areal growth rates were lowest in the Athabasca Delta, intermediate in the Birch Delta, and highest in the Cree Creek Delta. Annual sediment delivery is increasing in the Cree Creek Delta; there were no significant trends in annual sediment delivery in the Birch and Athabasca Deltas. There was a lag of up to several years between sediment delivery events and progradation. Periods of delta progradation were associated with low water levels of the receiving basins. Predicted climate-change driven declines in river discharge and lake levels may accelerate delta progradation in the region. In the changing ecosystems of northeastern Alberta, inadequate monitoring of vegetation, landforms, and sediment regimes hampers the elucidation of the nature, rate, and causality of ecosystem changes.

  8. Can Up FCNC solve the $\\Delta A_{CP}$ puzzle?

    CERN Document Server

    Wang, Kai

    2011-01-01

    We investigate the attempt using flavor violation gauge interaction in the up sector to explain the LHCb recently observed large $\\Delta A_{CP}$ ($A_{CP}(D^{0}\\to K^{+}K^{-})-A_{CP}(D^{0}\\to \\pi^{+}\\pi^{-})$). We study an Abelian model that only right-handed up quarks is charged under it and the 1-3 coupling is maximized. The simultaneous 1-3 2-3 mixing is realized by a quark mixing of 1-2 generation. Given the easy identification of top quark, the model can be directly tested by $\\Delta F=1$ and $\\Delta F=2$ processes at the hadron colliders as associated top production $g c \\to t Z^{\\prime}$ or same-sign top scattering $u u\\to t t$. The direct search bounds are still consistent with the assumption that $ut$ and $ct$ couplings are equal but the same-sign top scattering bound is expected to be reached very soon. However, since there is no CKM-like suppression, the corresponding parameter space for generating $\\Delta A_{CP}$ is completely excluded by the $D^{0}-\\bar{D}^{0}$ mixing. We conclude that the up FCNC...

  9. Considerations in designing an evaluation system for adaptive delta management

    NARCIS (Netherlands)

    Hermans, L.M.; Maat, J.; Haasnoot, M.; Kwakkel, J.H.

    2014-01-01

    New planning approaches put new requirements on evaluation. A recent innovation in the water domain is adaptive delta management (ADM). ADM supports long-term planning in the face of uncertainty. This paper discusses the main considerations for the design of an evaluation system for ADM, departing f

  10. Obesity and Health Risk of Children in the Mississippi Delta

    Science.gov (United States)

    Gamble, Abigail; Waddell, Dwight; Ford, M. Allison; Bentley, John P.; Woodyard, Catherine D.; Hallam, Jeffrey S.

    2012-01-01

    Background: Mississippi (MS) Delta adults and youth report obesity rates far exceeding those of the state and nation. State law requires in-school physical activity and nutrition practices to address childhood obesity but does not require evaluation of outcomes, specifically the impact on weight-related outcomes. This paper offers 3 things: (1)…

  11. On the Stability of a Double Integration Delta Modulator

    DEFF Research Database (Denmark)

    Nielsen, Palle Tolstrup

    1971-01-01

    A delta modulator with a second-order network in the feedback path is considered. For zero input signal the possible modes of oscillation are determined as a function of the zero of the linear network. The method could be employed with other types of feedback networks. A comparison is made with...

  12. Revealing {\\delta} Cephei's Secret Companion and Intriguing Past

    CERN Document Server

    Anderson, Richard I; Holl, Berry; Eyer, Laurent; Palaversa, Lovro; Mowlavi, Nami; Süveges, Maria; Roelens, Maroussia

    2015-01-01

    Classical Cepheid variable stars are crucial calibrators of the cosmic distance scale thanks to a relation between their pulsation periods and luminosities. Their archetype, {\\delta} Cephei, is an important calibrator for this relation. In this paper, we show that {\\delta} Cephei is a spectroscopic binary based on newly-obtained high-precision radial velocities. We combine these new data with literature data to determine the orbit, which has period 2201 days, semi-amplitude 1.5 km/s, and high eccentricity (e = 0.647). We re-analyze Hipparcos intermediate astrometric data to measure {\\delta} Cephei's parallax ($\\varpi = 4.09 \\pm 0.16$ mas) and find tentative evidence for an orbital signature, although we cannot claim detection. We estimate that Gaia will fully determine the astrometric orbit. Using the available information from spectroscopy, velocimetry, astrometry, and Geneva stellar evolution models ($M_{\\delta Cep} ~ 5.0 - 5.25 M_\\odot$), we constrain the companion mass to within $0.2 < M_2 < 1.2 M_\\...

  13. The Government Role in Pan-Pearl River Delta Development

    Institute of Scientific and Technical Information of China (English)

    YiFan; LuRucai

    2004-01-01

    THE Pan-Pearl River Delta (PPRD) Regional Cooperation development strategy has received the central government and relevant State Council departments' immediate attention. As regional cooperation operates under a market system, the governmental role is service-oriented, while enterprises have more decision making power.

  14. Leena delta rännujutud / Riho Västrik

    Index Scriptorium Estoniae

    Västrik, Riho, 1965-

    2010-01-01

    Reisikiri Leena jõest filmi tegeva filmimeeskonna matkast Leena jõe delta tundras, kus satuti ka 1879. aastal purjelaeval "Jeannette" põhjapoolust vallutama tulnud ameerika polaaruurija DeLongi matmispaiga ja mälestusmärgi juurde

  15. Dermal absorption of the insecticide lindane (1 delta, 2 delta, 3 beta, 4 delta, 5 delta, 6 beta-hexachlorocyclohexane) in rats and rhesus monkeys: Effect of anatomical site

    International Nuclear Information System (INIS)

    Dermal absorption of the insecticide lindane (1 delta, 2 delta, 3 beta, 4 delta, 5 delta, 6 beta-hexachlorocyclohexane) was determined in rats and rhesus monkeys. Lindane is in widespread use as a 1% cream or lotion scabicide formulation and as a 1% miticide shampoo for body lice control in humans. Results obtained following our in vivo dermal absorption procedure demonstrated that 18 +/- 4.1%, 34 +/- 5.2%, and 54 +/- 26.3% of the applied dose was absorbed following topical applications at a rate of 1.5 micrograms/cm2 (6.2 micrograms/100 microliters of acetone) of the 14C-labeled pesticide to 4.2-cm2 regions of the forearm (n = 8), forehead (n = 7), and palm (n = 4) of rhesus monkeys, respectively. Dose sites were washed with soapy water 24 h posttreatment. Comparative studies in rats (n = 5) dosed middorsally demonstrated 31 +/- 9.5% absorption. Statistical analysis of the 14C excretion kinetics demonstrated slower clearance of lindane from rats than monkey forearm, forehead, or palm. Intramuscular (im) injections of 14C-lindane gave 52 +/- 7.1% recovery in monkey (n = 8) and 64 +/- 5.9% in rats (n = 5), suggesting body storage of this lipophilic chemical

  16. Review: Advances in delta-subsidence research using satellite methods

    Science.gov (United States)

    Higgins, Stephanie A.

    2016-05-01

    Most of the world's major river deltas are sinking relative to local sea level. The effects of subsidence can include aquifer salinization, infrastructure damage, increased vulnerability to flooding and storm surges, and permanent inundation of low-lying land. Consequently, determining the relative importance of natural vs. anthropogenic pressures in driving delta subsidence is a topic of ongoing research. This article presents a review of knowledge with respect to delta surface-elevation loss. The field is rapidly advancing due to applications of space-based techniques: InSAR (interferometric synthetic aperture radar), GPS (global positioning system), and satellite ocean altimetry. These techniques have shed new light on a variety of subsidence processes, including tectonics, isostatic adjustment, and the spatial and temporal variability of sediment compaction. They also confirm that subsidence associated with fluid extraction can outpace sea-level rise by up to two orders of magnitude, resulting in effective sea-level rise that is one-hundred times faster than the global average rate. In coming years, space-based and airborne instruments will be critical in providing near-real-time monitoring to facilitate management decisions in sinking deltas. However, ground-based observations continue to be necessary for generating complete measurements of surface-elevation change. Numerical modeling should seek to simulate couplings between subsidence processes for greater predictive power.

  17. Asteroseismology of hybrid $\\delta$ Scuti--$\\gamma$ Doradus pulsating stars

    CERN Document Server

    Arias, J P Sánchez; Althaus, L G

    2016-01-01

    Hybrid $\\delta$ Scuti-$\\gamma$ Doradus pulsating stars show acoustic ($p$) oscillation modes typical of $\\delta$ Scuti variable stars, and gravity ($g$) pulsation modes characteristic of $\\gamma$ Doradus variable stars simultaneously excited. Observations from space missions like MOST, CoRoT, and \\emph{Kepler} have revealed a large number of hybrid $\\delta$ Scuti-$\\gamma$ Doradus pulsators, thus paving the way for a exciting new channel for asteroseismic studies. We perform a detailed asteroseismological modeling of five hybrid $\\delta$ Scuti-$\\gamma$ Doradus stars. We employ a grid-based modeling approach to sound the internal structure of the target stars by employing a huge grid of stellar models from the zero-age main sequence to the terminal-age main sequence, varying parameters like stellar mass, effective temperature, metallicity and core overshooting. We compute their adiabatic radial ($\\ell= 0$) and non-radial ($\\ell= 1, 2, 3$) $p$ and $g$ mode periods. We employ two model-fitting procedures to searc...

  18. An extension of the linear delta expansion to superspace

    International Nuclear Information System (INIS)

    We introduce and discuss the method of linear delta expansion for the calculation of effective potentials in superspace, by adopting the improved version of the super-Feynman rules. Calculations are carried out up to two loops and an expression for the optimized Kaehler potential in the Wess-Zumino model is worked out

  19. Practical Design of Delta-Sigma Multiple Description Audio Coding

    DEFF Research Database (Denmark)

    Leegaard, Jack Højholt; Østergaard, Jan; Jensen, Søren Holdt; Zamir, Ram

    2014-01-01

    It was recently shown that delta-sigma quantization (DSQ) can be used for optimal multiple description (MD) coding of Gaussian sources. The DSQ scheme combined oversampling, prediction, and noise-shaping in order to trade off side distortion for central distortion in MD coding. It was shown that...

  20. Nonlinearities in SC Delta-Sigma A/D Converters

    DEFF Research Database (Denmark)

    Steensgaard-Madsen, Jesper

    The effects of using nonlinear low-gain opamps in switched-capacitor delta-sigma modulators are analyzed. Using unconventional topologies, the state variables are made essentially uncorrelated with the input signal, hence opamp nonlinearity will cause very little harmonic distortion. Nonlinearity...

  1. Influence of delta ferrite weld metal content on hydrogen embrittlement

    International Nuclear Information System (INIS)

    Stainless steel weld metal specimens (304 L) with different ferrite contents were cathodically charged at room temperature. The microcrack nucleation sites were observed by scanning electron microscopy (SEM). The role of delta ferrite content on hydrogen embrittlement was assessed by bend tests

  2. 75 FR 56094 - Delta-Mendota Canal Intertie Project

    Science.gov (United States)

    2010-09-15

    ... Area Power Administration Delta-Mendota Canal Intertie Project AGENCY: Western Area Power... fiber optic cable for delivery of project use power as part of the Department of the Interior, Bureau of... (Intertie) project. The Intertie, including the interconnection to Western's system and transmission...

  3. Petrophysical Evaluation Of Radioactive Sands In The Niger Delta

    International Nuclear Information System (INIS)

    Wire line logging tools responses in the Niger Delta are often affected by the presence of several radioactive minerals. The interpretation of hydrocarbon bearing radioactive sands using conventional approaches has resulted in underestimation of hydrocarbon resources. To gain more insight into the problem of radioactive hydrocarbon bearing formations in the Niger Delta, a project was carried out within Shell to study the structure, mineralogy and pore geometry associated with radioactive sand typical of the Niger Delta, and develop evaluation techniques for improved recognition of radioactive sands. The nature of radioactive sands encountered in the Niger Delta is now better understood and an automated identification procedure based on wire line logs using neural networks has been developed. Radioactive sands are sometimes laminae are masked by those of the shale laminae thereby leading to low resistivity readings despite the presence of appreciable amounts of producible hydrocarbons. The structural configuration of radioactive sands has necessitated the development of of an evaluation package for thin bedded shaly sandstone reservoirs. The application of the evaluation package indicates significant increases in hydrocarbon volumes when compared to conventional evaluation. approaches

  4. Monte Carlo simulations of the stability of delta-Pu

    DEFF Research Database (Denmark)

    Landa, A.; Soderlind, P.; Ruban, Andrei

    2003-01-01

    . It is found that at T-c similar to 548 K, delta-Pu undergoes transformation from a disordered magnetic state to a structure with an anti ferromagnetic spin alignment that is mechanically unstable with respect to tetragonal distortion. The calculated transition temperature is in good agreement with...

  5. Results from the initial operation of the LANL delta loop

    International Nuclear Information System (INIS)

    This paper summarises results from the initial operation and shakedown testing of the recently constructed DELTA (development of lead-bismuth target applications) loop at Los Alamos National Laboratory. The DELTA loop was designed to study the long-term corrosive effects of liquid lead bismuth eutectic (LBE) on structural materials at temperatures up to 500 deg C. The DELTA loop can also be used to study thermal and hydraulic properties of LBE flow in future spallation target designs. The first run of DELTA loop took place on 5 December 2001. Since then, several hours of shakedown testing have been performed. These tests include calibration of the magnetic flow meter; pump operation with flow velocities up to 4 m/s in the test section, natural convection operation at velocities up to 0.5 m/s in the test section, isothermal flow operation at temperatures up to 375 deg C, and heat exchanger operation at different capacities. The loop is scheduled to be ready for long-term, unattended operation early this summer followed directly by a planned, 1 000 hour material test. (authors)

  6. Overcoming the Education Challenge of Poverty in the Mississippi Delta

    Science.gov (United States)

    Rutherford, Angela S.; Hillmer, Tamara; Parker, Ashley

    2011-01-01

    Tunica County, Mississippi, in the heart of the delta, has been home to stagnant academic achievement even as federal and state funds increased. A teacher-focused professional development program through the University of Mississippi helped yield higher scores and national recognition for an elementary school. It also revealed some learnings:…

  7. 2009-2010 USACE Vicksburg District Lidar: Mississippi River Delta

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — LiDAR collected at 1.0 points per square meter (1.0m GSD) for the entire portion of the Mississippi River Delta in the Vicksburg District. This area was flown...

  8. Neutrino-Deuteron Reactions in the $\\Delta$(1232) Region

    CERN Document Server

    Lee, T -S H

    2016-01-01

    The results from an investigation of the incoherent single pion electroweak production on the deuteron in the $\\Delta$(1232) region are reported. The importance of including the nucleon-nucleon final state interactions in extracting the neutrino-nucleon cross sections from the data obtained from the experiments on the deuteron target is demonstrated.

  9. Force Measurement on the GLAST Delta II Flight

    Science.gov (United States)

    Gordon, Scott; Kaufman, Daniel

    2009-01-01

    This viewgraph presentation reviews the interface force measurement at spacecraft separation of GLAST Delta II. The contents include: 1) Flight Force Measurement (FFM) Background; 2) Team Members; 3) GLAST Mission Overview; 4) Methodology Development; 5) Ground Test Validation; 6) Flight Data; 7) Coupled Loads Simulation (VCLA & Reconstruction); 8) Basedrive Simulation; 9) Findings; and 10) Summary and Conclusions.

  10. Experience on tangent delta norms adopted for repaired generators

    Energy Technology Data Exchange (ETDEWEB)

    Misra, N.N.; Sood, D.K. [National Thermal Power Corp., (India)

    2005-07-01

    Since repair measures and techniques for generators are critical in avoiding prolonged forced outages, repair decisions must be based on sound knowledge and judgement. This paper describes a the failure of an electric generator unit which failed due to flashover in the Exciter end overhang windings. During inspection, early symptoms of slot partial discharge were observed along with degradation of the outer corona coatings of stator bars. The unit was commissioned in 1988 and had 67.5 MW generating capacity operating at 50 Hz, 0.85 pf lag and had logged 66160.46 operating hours before failure. The failure caused damage to the stator bars and to the generator core. The damaged end packets of the stator core were replaced at site. The winding bars were removed from the stator core and damaged bars were also replaced. The remainder were tested for tangent delta tests for reuse. Acceptance norms of 0.6 per cent tip up from 0.2 pu to 0.6 pu of rotor stator voltage were adopted. Some of the bars outside the acceptable limits of tangent delta were shifted close to neutral in order to meet the standard norms of tan delta. These adopted norms for tangent delta will be of particular use for the operating utilities. It was concluded that the most probable cause of failure was the continuous degradation of the winding insulation due to high overhang vibration causing electrical and mechanical stresses. 2 tabs., 7 figs.

  11. Morphological change in the Pearl River Delta, China

    NARCIS (Netherlands)

    Zhang, W.; Xu, Y.; Hoitink, A.J.F.; Sassi, M.G.; Zhang, J.; Chen, X.; Zhang, C.

    2015-01-01

    Morphological changes in the Pearl River Delta (PRD) have been investigated using bathymetric charts, underwater Digital Elevation Models, remote sensing data and Geographic Information Systems. Water depths were extracted from digitized charts to explore the accretion–erosion characteristics of thr

  12. Agriculture in the Northwest-European delta metropolis

    NARCIS (Netherlands)

    Smeets, P.J.A.M.

    2004-01-01

    The southern and central regions of The Netherlands are part of the Northwest- European Delta Metropolis. The demands placed by modern, urban society on the agricultural sector are numerous. Not only are the environment, animal welfare, and food hygiene and quality at stake here, but also must these

  13. Hepatitis delta in HIV-infected individuals in Europe

    DEFF Research Database (Denmark)

    Soriano, Vincent; Grint, Daniel; Monforte, Antonellad'arminio;

    2011-01-01

    BACKGROUND:: Hepatitis delta virus (HDV) infection results in the most aggressive form of chronic viral hepatitis. There is scarce information about the prevalence, epidemiology, virological profile and natural historyof hepatitis delta in HIV patients. METHODS:: From 16,597 HIV patients enrolled......-RNA was quantified using a real-time PCR method. RESULTS:: A total of 61/422 HBsAg+ carriers were anti-HDV+ (prevalence: 14.5%). Hepatitis delta predominated in intravenous drug users and for this reason in South and/or East Europe. Serum HDV-RNA was detectable in 87% of tested anti-HDV+ patients, with a median...... titer of 1.76x10¿copies/ml. Overall, delta hepatitis patients showed lower serum HBV-DNA than the rest of HBsAg+ carriers, although the inhibitory effect of HDV on HBV replication was not recognized in HBV genotype D patients.Whereas HDV was not associated with progression to AIDS, it significantly...

  14. Validity and reliability of the Delta Healthy Eating Attitudes Scale

    Science.gov (United States)

    The objective of this study was to evaluate psychometric properties of an instrument developed to measure psychosocial factors related to the Dietary Guidelines for Americans for a nutrition intervention in the Lower Mississippi Delta (LMD). Social Cognitive Theory constructs social support (SS), s...

  15. Support for the sustainable development of the Yellow River Delta

    NARCIS (Netherlands)

    De Vrees, L.; Wang, Z.B.; Marchand, M.

    2011-01-01

    The environment in the Yellow River Delta (YRD) is under stress from large socio-economic pressures, leading to air, soil and water pollution. A Sino-Dutch project the Sustainable Development YRD project (1995 – 1997) was undertaken with the principle goal of contributing to the sustainable, long-te

  16. Photon electroproduction off nuclei in the $\\Delta$-resonance region

    OpenAIRE

    Pasquini, B.

    1996-01-01

    The cross section for the $A(e,e'\\gamma)A$ reaction is calculated, investigating the contribution from the nuclear target with respect to the radiative corrections from the electron. The reaction mechanism is studied for photon emission in the $\\Delta$-resonance region, varying the scattering geometry and analyzing the most favourable kinematical conditions to extract information on the nuclear system.

  17. Delta-Isobar Production in Antiproton Annihilation on the Deuteron

    OpenAIRE

    Lykasov, G. I.; Bussa, M. P.; Valacca, L.

    1997-01-01

    The annihilation of antiprotons on deuterons at rest are investigated for the case when pion-nucleon and pion-delta-isobar pairs are produced. The two-step mechanism is investigated by analysing these processes when either neutral particles and charged ones are produced. Some predictions for the branching ratios are presented.

  18. Pion-nucleon scattering around the delta resonance

    OpenAIRE

    Long, Bingwei

    2009-01-01

    We develop a generalized version of heavy-baryon chiral perturbation theory to describe pion-nucleon scattering in a kinematic domain that extends continuously from threshold to the delta-isobar peak. The $P$-wave phase shifts are used to illustrate this framework.

  19. Review: Advances in delta-subsidence research using satellite methods

    Science.gov (United States)

    Higgins, Stephanie A.

    2015-11-01

    Most of the world's major river deltas are sinking relative to local sea level. The effects of subsidence can include aquifer salinization, infrastructure damage, increased vulnerability to flooding and storm surges, and permanent inundation of low-lying land. Consequently, determining the relative importance of natural vs. anthropogenic pressures in driving delta subsidence is a topic of ongoing research. This article presents a review of knowledge with respect to delta surface-elevation loss. The field is rapidly advancing due to applications of space-based techniques: InSAR (interferometric synthetic aperture radar), GPS (global positioning system), and satellite ocean altimetry. These techniques have shed new light on a variety of subsidence processes, including tectonics, isostatic adjustment, and the spatial and temporal variability of sediment compaction. They also confirm that subsidence associated with fluid extraction can outpace sea-level rise by up to two orders of magnitude, resulting in effective sea-level rise that is one-hundred times faster than the global average rate. In coming years, space-based and airborne instruments will be critical in providing near-real-time monitoring to facilitate management decisions in sinking deltas. However, ground-based observations continue to be necessary for generating complete measurements of surface-elevation change. Numerical modeling should seek to simulate couplings between subsidence processes for greater predictive power.

  20. Three Dimensional Morphodynamic and Vegetation Modeling of Wax Lake Delta

    Science.gov (United States)

    Khadka, A. K.; Meselhe, E. A.; Sadid, K. M.

    2013-12-01

    The Wax Lake Delta (WLD) is located at the downstream end of the Wax Lake outlet, approximately 13 miles upstream from Morgan City, Louisiana. In 1942 the United States Army Corps of Engineer (USACE) dredged Wax Lake Outlet channel from lower Atchafalaya River to reduce flood stages at Morgan City. The channel diverts 50% of Atchafalaya River water and sediment to WLD. Since 1942, the WLD has been building seaward due to the deposition of sediment at the channel mouth. Growth of this delta supports the concept of land building via river diversions. A process based morphodynamic model (Delft3D) with the ability to predict evolution of river-dominated deltas is used in this study to further our understanding of land-building and delta growth processes. Initial model bathymetry is prepared based on USACE hydrographic survey of 1998 along with LIDAR survey data for over bank areas. Two continuous gauges at Wax Lake outlet near Calumet and Atchafalaya Bay near Eugene Island are used to assign upstream inflow and outflow boundary conditions, respectively. The model is calibrated and validated for Hydrodynamics and Sediment transport through two sets of field observations for flooded and average conditions. Vertical velocity and suspended sediment profiles made in the channels of the WLD in 2000 and 2001 are used for the model calibration and validation. More comprehensive field observations are being gathered as part of an ongoing study funded by the National Science Foundation (FESD-Delta Dynamics Collaboratory). Data include mutli-beam bathymetric data, velocities, sediment, and nutrient concentrations in the channels as well as on top of the islands. The Delft3D morphodynamic model for WLD provides quantitative information regarding water and sediment distribution among the inter-connected channel bifurcations, the exchange of sediment and nutrients between the channels and islands. The model is being used to investigate the rate of land building and delta growth from

  1. What Role do Hurricanes Play in Sediment Delivery to Subsiding River Deltas?

    OpenAIRE

    Smith, James E.; Bentley, Samuel J.; Gregg A. Snedden; Crawford White

    2015-01-01

    The Mississippi River Delta (MRD) has undergone tremendous land loss over the past century due to natural and anthropogenic influences, a fate shared by many river deltas globally. A globally unprecedented effort to restore and sustain the remaining subaerial portions of the delta is now underway, an endeavor that is expected to cost $50–100B over the next 50 yr. Success of this effort requires a thorough understanding of natural and anthropogenic controls on sediment supply and delta geomorp...

  2. Alteration in the level of endogenous hypothalamic prostaglandins induced by delta 9-tetrahydrocannabinol in the rat.

    OpenAIRE

    Coupar, I M; Taylor, D A

    1982-01-01

    1 Whole brain and regional brain levels of prostaglandin E2 (PGE2)-like material have been determined following administration of delta 9-tetrahydrocannabinol (delta 9 -THC) in rats. 2 Intravenous administration of delta 9-THC 2 mg/kg, resulted in marked behavioural changes and hypothermia. The behavioural changes consisted mainly of catatonia (most apparent at 30 min after administration of delta 9-THC), followed by sedation (most evident at 60 min). Hypothermia was marked from 30 min after ...

  3. Reconstructing the natural hydrology of the San Francisco Bay–Delta watershed

    OpenAIRE

    Fox, P; P. H. Hutton; D. J. Howes; A. J. Draper; L. Sears

    2015-01-01

    We evaluated the impact of landscape changes on the amount of delta outflow reaching San Francisco Bay. The natural landscape was reconstructed and water balances were used to estimate the long-term annual average delta outflow that would have occurred under natural landscape conditions if the climate from 1922 to 2009 were to repeat itself. These outflows are referred to as natural delta outflows and are the first published estimate of natural delta outflow. These natural d...

  4. Analysis of $\\Delta^{+}(1232)$ Isobar Observables, with Improved Quark Distribution Amplitudes

    OpenAIRE

    Stefanis, N. G.; Bergmann, M.

    1992-01-01

    A model distribution amplitude for the $\\Delta^{+}(1232)$ isobar is proposed, derived on the basis of the QCD sum-rule calculations of Farrar et al. combined with those of Carlson and Poor. The transition form factor $\\gamma p\\Delta^{+}$ is calculated modeling the proton by selected distribution amplitudes. Furthermore, predictions are made for some exclusive charmonium decays into $\\Delta\\bar{\\Delta}$. The obtained results are compared with other theoretical models and with the available data.

  5. The transmission of low frequency medical data using delta modulation techniques.

    Science.gov (United States)

    Arndt, G. D.; Dawson, C. T.

    1972-01-01

    The transmission of low-frequency medical data using delta modulation techniques is described. The delta modulators are used to distribute the low-frequency data into the passband of the telephone lines. Both adaptive and linear delta modulators are considered. Optimum bit rates to minimize distortion and intersymbol interference are discussed. Vibrocardiographic waves are analyzed as a function of bit rate and delta modulator configuration to determine their reproducibility for medical evaluation.

  6. Aspectos internacionais da Revolta da Chibata

    Directory of Open Access Journals (Sweden)

    Joseph L. Love

    2011-09-01

    Full Text Available This paper treats four international dimensions of the Revolta da Chibata: 1 the trip of the Dreadnought Sao Paulo to Lisbon (with Presidente Hermes aboard, during which the Portuguese monarchy was overthrown, providing a model for Brazilian sailors; 2 the reception and interpretation of the revolt by the French, British, and American presses, which quickly saw that the central issue was torture; 3 ideological aspects of the revolt, which focus on the rights of citizens under the constitution of 1891; and 4 foreign observers’ favorable impression of the working conditions of Batalhao Naval before the second rebellion in December, and their discovery of a massacre after the second revolt.

  7. Underground and Previously Undiscovered Rivers in the Mississippi Delta

    Science.gov (United States)

    Kolker, A.; Breaux, A.; Coleman, D.; Inniss, L. V.; Telfeyan, K.; Kim, J.; Schneider, A.; Allison, M. A.; Cable, J. E.; Johannesson, K. H.

    2013-12-01

    In this study we show that there are large, and previously undiscovered, groundwater pathways by which water from the Mississippi River is transported to the wetlands and estuaries of the Mississippi River Delta. Results from multiple methodologies suggest that the total flux of groundwater to the coastal zone in the Mississippi River Delta averages 1,000 m3 s-1, and can reach 5,000 m3 s-1 at high flow. We suggest that flow preferentially occurs through paleo-crevasse channels, relict bayous, and other buried deposits of permeable and coarse grained material. These conduits were formed during the present and previous stages of the delta cycle, which occurred in historical (102 y) and late Holocene(103 y) times, respectively. Flow is driven by the hydrological head difference between the river and the estuary, which is seasonally variable in magnitudeand can reach 5-8 m during peak river floods. This talk will present data from hydrological budgets that show a missing fraction in the Mississippi River water budget, and a missing source of fresh water to a large estuary. We will show that water levels in wells in New Orleans fluctuate with the stage of the Mississippi River. Data of Rn concentration indicate advective submarine groundwater flow, whereas Ba concentrations suggest geochemical leachates are entering the estuary. Furthermore, seismic data indicate the prevalence of paleochannels and other buried features that could carry flow. Given the importance of deltas to global geochemical budgets, we suggest that these results may be generalizable: submarine groundwater discharge in deltas may prove to be an important but understudied pathway by which dissolved materials are transported from the continents to the ocean.

  8. THE FUNCTIONAL SIGNIFICANCE OF DELTA OSCILLATIONS IN COGNITIVE PROCESSING

    Directory of Open Access Journals (Sweden)

    Thalia Harmony

    2013-12-01

    Full Text Available Ample evidence suggests that EEG oscillatory activity is linked to a broad variety of perceptual, sensorimotor, and cognitive operations. However, few studies have investigated the delta band (1-3.5 Hz during different cognitive processes. The aim of this review is to present data and propose the hypothesis that sustained delta oscillations inhibit interferences that may affect the performance of mental tasks, possibly by modulating the activity of those networks that should be inactive to accomplish the task. It is clear that two functionally distinct and potentially competing brain networks can be broadly distinguished by their contrasting roles in attention to the external world versus the internally directed mentation or concentration. During concentration, EEG delta (1-3.5 Hz activity increases mainly in frontal leads in different tasks: mental calculation, semantic tasks, and the Sternberg paradigm. This last task is considered a working memory task, but in neural, as well as phenomenological, terms, working memory can be best understood as attention focused on an internal representation. In the Sternberg task, increases in power in the frequencies from 1 to 3.90 Hz in frontal regions are reported. In a Go/No-Go task, power increases at 1 Hz in both conditions were observed during 100–300 ms in central, parietal and temporal regions. However, in the No-Go condition, power increases were also observed in frontal regions, suggesting its participation in the inhibition of the motor response. Increases in delta power were also reported during semantic tasks in children. In conclusion, the results suggest that power increases of delta frequencies during mental tasks are associated with functional cortical deafferentation, or inhibition of the sensory afferences that interfere with internal concentration. These inhibitory oscillations would modulate the activity of those networks that should be inactive to accomplish the task.

  9. Differential entrainment of neuroelectric delta oscillations in developmental dyslexia.

    Directory of Open Access Journals (Sweden)

    Fruzsina Soltész

    Full Text Available Oscillatory entrainment to the speech signal is important for language processing, but has not yet been studied in developmental disorders of language. Developmental dyslexia, a difficulty in acquiring efficient reading skills linked to difficulties with phonology (the sound structure of language, has been associated with behavioural entrainment deficits. It has been proposed that the phonological 'deficit' that characterises dyslexia across languages is related to impaired auditory entrainment to speech at lower frequencies via neuroelectric oscillations (<10 Hz, 'temporal sampling theory'. Impaired entrainment to temporal modulations at lower frequencies would affect the recovery of the prosodic and syllabic structure of speech. Here we investigated event-related oscillatory EEG activity and contingent negative variation (CNV to auditory rhythmic tone streams delivered at frequencies within the delta band (2 Hz, 1.5 Hz, relevant to sampling stressed syllables in speech. Given prior behavioural entrainment findings at these rates, we predicted functionally atypical entrainment of delta oscillations in dyslexia. Participants performed a rhythmic expectancy task, detecting occasional white noise targets interspersed with tones occurring regularly at rates of 2 Hz or 1.5 Hz. Both groups showed significant entrainment of delta oscillations to the rhythmic stimulus stream, however the strength of inter-trial delta phase coherence (ITC, 'phase locking' and the CNV were both significantly weaker in dyslexics, suggestive of weaker entrainment and less preparatory brain activity. Both ITC strength and CNV amplitude were significantly related to individual differences in language processing and reading. Additionally, the instantaneous phase of prestimulus delta oscillation predicted behavioural responding (response time for control participants only.

  10. File list: ALL.Bld.50.AllAg.delta-47 [Chip-atlas[Archive

    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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    Lifescience Database Archive (English)

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  18. The width of the $\\Delta$-resonance at two loop order in baryon chiral perturbation theory

    CERN Document Server

    Gegelia, Jambul; Siemens, Dmitrij; Yao, De-Liang

    2016-01-01

    We calculate the width of the delta resonance at leading two-loop order in baryon chiral perturbation theory. This gives a correlation between the leading pion-nucleon-delta and pion-delta couplings, which is relevant for the analysis of pion-nucleon scattering and other processes.

  19. 75 FR 33694 - Safety Zone; Delta Independence Day Foundation Celebration, Mandeville Island, CA

    Science.gov (United States)

    2010-06-15

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Delta Independence Day Foundation... Mandeville Island, CA for the Delta Independence Day Foundation Celebration Fireworks Display. This safety... the event area. Background and Purpose The Delta Independence Day Foundation will sponsor a...

  20. Late-Holocene evolution of the Mahakam delta, East Kalimantan, Indonesia

    NARCIS (Netherlands)

    Storms, J.E.A.; Hoogendoorn, R.M.; Dam, R.A.C.; Hoitink, A.J.F.; Kroonenberg, S.B.

    2005-01-01

    The late-Holocene Mahakam delta, located along the tropical eastern shore of Kalimantan, Indonesia, is considered to be a textbook example of a mixed tide-fluvial dominated delta system. The delta prograded about 60 km during the past 5000 years, which led to the development of a distinct network of

  1. A new identification method for energetic ion {delta}E-E telescopes

    Energy Technology Data Exchange (ETDEWEB)

    Martin, Cesar [Departamento de Fisica, Universidad de Alcala, 28871 Alcala de Henares, Madrid (Spain); Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts, Universitaet zu Kiel, 24118 Kiel (Germany); Bronchalo, Enrique [Departamento de Fisica, Universidad de Alcala, 28871 Alcala de Henares, Madrid (Spain); Departamento de Fisica y Arquitectura de Computadores, Universidad Miguel Hernandez, Avda. Universidad s/n, 03202 Elche, Alicante (Spain)], E-mail: ebronchalo@umh.es; Medina, Jose [Departamento de Fisica, Universidad de Alcala, 28871 Alcala de Henares, Madrid (Spain)

    2007-11-21

    A new ion identification method for {delta}E-E telescopes is presented. The method works by counting data points under {delta}E(E) curves on {delta}E-E diagrams. These curves are obtained by simulating the telescope response to a flux of energetic ions. The method is checked against three published methods applied to several experimental data sets.

  2. The importance of large scale flood over the regular sedimentation in delta development: A case study involving Wax lake delta

    Science.gov (United States)

    Ullah, M. S.; Kolker, A.; Li, C.

    2011-12-01

    It has been widely hypothesized that catastrophic floods can play an important role in the development of a young and growing delta. This study examines the nature and rate of sediment deposition in the Wax lake delta in the Atchafalaya Basin of Louisiana during the Mississippi River flood of from April, 2011 to June, 2011. We hypothesize that the deposition rate that results from large scales floods in the Mississippi/Atchafalaya river outlets have a greater impact in the Wax lake delta development than the deposition rates that result from typical yearly sedimentation. Preliminary results from the cosmogenic 7Be counts from sediment collected from the delta show distinct regional and local sediment deposition patterns during the flood, and rates that are significantly higher when compared to the sedimentation rate of the last few decades. This application of cosmogenic 7Be to distinguish the sediment deposition rate provides a first-order understanding of the deltaic evolution and stratigraphic sequence development in a high-discharge setting.

  3. Microstructural Evidence for Conditioning-dependent (delta) -> (alpha)' Transformations in Retained (delta)-phase Pu-Ga

    Energy Technology Data Exchange (ETDEWEB)

    Jeffries, J R; Blobaum, K M; Wall, M A; Schwartz, A J

    2008-06-16

    The retained {delta} phase of a Pu-1.9 at.% Ga alloy is metastable with respect to the martensitic {delta} {yields} {alpha}{prime} transformation that occurs at low temperatures. This transformation has been shown to proceed by means of an isothermal martensitic mode, but the kinetics of the transformation are atypical. The transformation exhibits a 'double-C' in a time-temperature-transformation diagram, wherein there exist two temperatures where a given amount of transformation occurs in a minimum amount of time. The cause of the double-C kinetics remains uncertain, eliciting proposals of multiple mechanisms, multiple paths, or different morphologies as possible origins. Recently, a 'conditioning' treatment was found to affect the {delta} {yields} {alpha}{prime} transformation, but the underlying mechanism by which the conditioning treatment influences the transformation has not yet been resolved. In this study, microstructural characterization as a function of temperature, time, and conditioning has been employed to illuminate the role of conditioning in the {delta} {yields} {alpha}{prime} transformation. Conditioning is found to enhance transformation in the upper-C and to enable transformation in the lower-C. The data garnered from these experiments suggest that conditioning is intimately linked to nucleation processes and of little consequence to the growth and morphology of the {alpha}{prime} product phase.

  4. Urban growth and environmental impacts in Jing-Jin-Ji, the Yangtze, River Delta and the Pearl River Delta

    Science.gov (United States)

    Haas, Jan; Ban, Yifang

    2014-08-01

    This study investigates land cover changes, magnitude and speed of urbanization and evaluates possible impacts on the environment by the concepts of landscape metrics and ecosystem services in China's three largest and most important urban agglomerations: Jing-Jin-Ji, the Yangtze River Delta and the Pearl River Delta. Based on the classifications of six Landsat TM and HJ-1A/B remotely sensed space-borne optical satellite image mosaics with a superior random forest decision tree ensemble classifier, a total increase in urban land of about 28,000 km2 could be detected alongside a simultaneous decrease in natural land cover classes and cropland. Two urbanization indices describing both speed and magnitude of urbanization were derived and ecosystem services were calculated with a valuation scheme adapted to the Chinese market based on the classification results from 1990 and 2010 for the predominant land cover classes affected by urbanization: forest, cropland, wetlands, water and aquaculture. The speed and relative urban growth in Jing-Jin-Ji was highest, followed by the Yangtze River Delta and Pearl River Delta, resulting in a continuously fragmented landscape and substantial decreases in ecosystem service values of approximately 18.5 billion CNY with coastal wetlands and agriculture being the largest contributors. The results indicate both similarities and differences in urban-regional development trends implicating adverse effects on the natural and rural landscape, not only in the rural-urban fringe, but also in the cities' important hinterlands as a result of rapid urbanization in China.

  5. The Importance Of Atmospheric {delta} {sup 18}O In Determining Leaf {delta} {sup 18}O In Oak And Pine

    Energy Technology Data Exchange (ETDEWEB)

    Reynolds, C.E.; Saurer, M.; Siegwolf, R.T.W.

    2005-03-01

    Strongly {delta} {sup 18}O depleted water vapour was used to study leaf isotopic enrichment and gas exchange properties in a climate-controlled cuvette under a range of environmental conditions. Results show that water vapour strongly influences leaf isotopic composition. This technique was successfully introduced as a novel tool for studying leaf water enrichment. (author)

  6. ANALYSIS OF HABITAT PATTERN CHANGE OF RED-CROWNED CRANES IN THE LIAOHE DELTA USING SPATIAL DIVERSITY INDEX

    Institute of Scientific and Technical Information of China (English)

    WANG Ling; LI Xiu-zhen; HU Yuan-man; GUO Du-fa

    2003-01-01

    Habitat pattern change of red-crowned c ranes (Grus japonensis) in the 1iaohe Delta between 1988 and1998 was analyzed with the help of Spatial Diversity Index based on renote sensing data and field investigation. The re-sult showed that the influence from human activities on the wetland habitat of red-crowned cranes was prominent with thedevelopment of oil and agricultural exploitation, and the habitat pattern of red-crowned cranes had been obviouslychanged by the human disturbance during the ten years. The areas with high Spatial Diversity values ( SD≥0. 65) andthat with mid-high values (0. 5 ≤ SD < 0. 65), which constituted the main part of suitable habitat of red-crownedcranes, had reduced to 9142ha and 5576ha respectively, with the shrinking of natural land cover, such as reed and Suae-da community. The habitat pattern became more fragmented, which was caused by roads and wells during oil explo-ration. It was indicated that the suitability and quality of habitat for red-crowned cranes in the Liaohe Delta were degrad-ed in the last decade. The results also showed that diversity index could reflect the habitat suitability of red-crownedcranes quantitatively and describe the spatial pattern of the habitat explicitly. This study will provide a scientific basisfor habitat protection of red-crowned cranes and other rare species in wetlands.

  7. Selfsimilar and fractal analysis of n-type delta-doped quasiregular GaAs quantum wells

    International Nuclear Information System (INIS)

    We study the electronic structure of n-type delta-doped quantum wells in GaAs in which the multiple well system is built according to the Fibonacci sequence. The building blocks A and B correspond to delta-doped wells with impurities densities n2DA and n2DB, and the same well width. The Thomas-Fermi approximation, the semi-empirical sp3s* tight-binding model including spin, the Surface Green Function Matching method and the Transfer Matrix approach were implemented to obtain the confining potential, the electronic structure and the selfsimilarity of the spectrum. The fragmentation of the electronic spectra is observed whenever the building blocks A and B interact and it increases as the difference of impurities density between A and B increases as well. The wave function of the first sate of the fragmented bands presents critical characteristics, this is, it is not a localized state nor a extended one as well as it has selfsimilar features. So, the quasiregular characteristics are preserved irrespective of the complexity of the system and can affect the performance of devices based on these structures

  8. Selfsimilar and fractal analysis of n-type delta-doped quasiregular GaAs quantum wells

    Energy Technology Data Exchange (ETDEWEB)

    García-Cervantes, H.; Rodríguez-Vargas, I. [Unidad Académica de Física, Universidad Autónoma de Zacatecas, Calzada Solidaridad Esquina Con Paseo La Bufa S/N, 98060 Zacatecas, Zac. (Mexico)

    2014-05-15

    We study the electronic structure of n-type delta-doped quantum wells in GaAs in which the multiple well system is built according to the Fibonacci sequence. The building blocks A and B correspond to delta-doped wells with impurities densities n{sub 2DA} and n{sub 2DB}, and the same well width. The Thomas-Fermi approximation, the semi-empirical sp{sub 3}s* tight-binding model including spin, the Surface Green Function Matching method and the Transfer Matrix approach were implemented to obtain the confining potential, the electronic structure and the selfsimilarity of the spectrum. The fragmentation of the electronic spectra is observed whenever the building blocks A and B interact and it increases as the difference of impurities density between A and B increases as well. The wave function of the first sate of the fragmented bands presents critical characteristics, this is, it is not a localized state nor a extended one as well as it has selfsimilar features. So, the quasiregular characteristics are preserved irrespective of the complexity of the system and can affect the performance of devices based on these structures.

  9. Análisis autosimilar de pozos cuánticos cuasirregulares delta dopados tipo n en GaAs

    Directory of Open Access Journals (Sweden)

    Heraclio García-Cervantes

    2014-01-01

    Full Text Available Se estudia la esctructura electrónica de pozos cuánticos delta dopados tipo n en GaAs, en el cual el sistema de multiples pozos es construido de acuerdo a la secuencia de Fibonacci. Los bloques A y B corresponden a pozos delta dopados con una densidad de impurezas n2DA y n2DB, y el mismo ancho de los pozos. La aproximación de Thomas-Fermi, el modesemi-empírico de enlace fuerte (tight-binding sp3s* incluyendo el espín, el modelo de empalme de la función de Green y la matriz de transferencia fueron implementados para obtener el potencial de confinamiento, la estructura electrónica y la autosimilaridad del espectro. La fragmentación del espectro electrónico se presenta cada vez que los bloques A y B interaccionan, y aumenta a medida que la diferencia de impurezas entre A y B aumenta. La función de onda del primer estado de las bandas fragmentadas presenta características críticas, esto es, no es un estado localizado ni extendido, presenta características de autosimilaridad. Por lo tanto, las características cuasiregulares se conservan independientemente de la complejidad del sistema y pueden afectar el funcionamiento de los dispositivos basados a estas estructuras.

  10. The gene controlling marijuana psychoactivity: molecular cloning and heterologous expression of Delta1-tetrahydrocannabinolic acid synthase from Cannabis sativa L.

    Science.gov (United States)

    Sirikantaramas, Supaart; Morimoto, Satoshi; Shoyama, Yoshinari; Ishikawa, Yu; Wada, Yoshiko; Shoyama, Yukihiro; Taura, Futoshi

    2004-09-17

    Delta(1)-tetrahydrocannabinolic acid (THCA) synthase is the enzyme that catalyzes oxidative cyclization of cannabigerolic acid into THCA, the precursor of Delta(1)-tetrahydrocannabinol. We cloned a novel cDNA (GenBank trade mark accession number AB057805) encoding THCA synthase by reverse transcription and polymerase chain reactions from rapidly expanding leaves of Cannabis sativa. This gene consists of a 1635-nucleotide open reading frame, encoding a 545-amino acid polypeptide of which the first 28 amino acid residues constitute the signal peptide. The predicted molecular weight of the 517-amino acid mature polypeptide is 58,597 Da. Interestingly, the deduced amino acid sequence exhibited high homology to berberine bridge enzyme from Eschscholtzia californica, which is involved in alkaloid biosynthesis. The liquid culture of transgenic tobacco hairy roots harboring the cDNA produced THCA upon feeding of cannabigerolic acid, demonstrating unequivocally that this gene encodes an active THCA synthase. Overexpression of the recombinant THCA synthase was achieved using a baculovirus-insect expression system. The purified recombinant enzyme contained covalently attached FAD cofactor at a molar ratio of FAD to protein of 1:1. The mutant enzyme constructed by changing His-114 of the wild-type enzyme to Ala-114 exhibited neither absorption characteristics of flavoproteins nor THCA synthase activity. Thus, we concluded that the FAD binding residue is His-114 and that the THCA synthase reaction is FAD-dependent. This is the first report on molecular characterization of an enzyme specific to cannabinoid biosynthesis. PMID:15190053

  11. Evaluating mercury biomagnification in fish from a tropical marine environment using stable isotopes (delta13C and delta15N).

    Science.gov (United States)

    Al-Reasi, Hassan A; Ababneh, Fuad A; Lean, David R

    2007-08-01

    Concentrations of total mercury (T-Hg) and methylmercury (MeHg) were measured in zooplankton and 13 fish species from a coastal food web of the Gulf of Oman, an arm of the Arabian Sea between Oman and Iran. Stable isotope ratios (delta13C and delta15N) also were determined to track mercury biomagnification. The average concentration of T-Hg in zooplankton was 21 +/- 8.0 ng g(-1) with MeHg accounting 10% of T-Hg. Total mercury levels in fish species ranged from 3.0 ng g(-1) (Sardinella longiceps) to 760 ng g(-1) (Rhizoprionodon acutus) with relatively lower fraction of MeHg (72%) than that found in other studies. The average trophic difference (Deltadelta13C) between zooplankton and planktivorous fish (Selar crumenopthalmus, Rastrelliger kanagurta, and S. longiceps) was higher (3.4 per thousandth) than expected, suggesting that zooplankton may not be the main diet or direct carbon source for these fish species. However, further sampling would be required to compensate for temporal changes in zooplankton and the influence of their lipid content. Trophic position inferred by delta15N and and slopes of the regression equations (log10[T-Hg] = 0.13[delta15N] - 3.57 and log10[MeHg] = 0.14[delta15N] - 3.90) as estimates of biomagnification indicate that biomagnification of T-Hg and MeHg was lower in this tropical ocean compared to what has been observed in arctic and temperate ecosystems and tropical African lakes. The calculated daily intake of methylmercury in the diet of local people through fish consumption was well below the established World Health Organization (WHO) tolerable daily intake threshold for most of the fish species except Euthynnus affinis, Epinephelus epistictus, R. acutus, and Thunnus tonggol, illustrating safe consumption of the commonly consumed fish species. PMID:17702328

  12. Alopecia in a viable phospholipase C delta 1 and phospholipase C delta 3 double mutant.

    Directory of Open Access Journals (Sweden)

    Fabian Runkel

    Full Text Available BACKGROUND: Inositol 1,4,5trisphosphate (IP(3 and diacylglycerol (DAG are important intracellular signalling molecules in various tissues. They are generated by the phospholipase C family of enzymes, of which phospholipase C delta (PLCD forms one class. Studies with functional inactivation of Plcd isozyme encoding genes in mice have revealed that loss of both Plcd1 and Plcd3 causes early embryonic death. Inactivation of Plcd1 alone causes loss of hair (alopecia, whereas inactivation of Plcd3 alone has no apparent phenotypic effect. To investigate a possible synergy of Plcd1 and Plcd3 in postnatal mice, novel mutations of these genes compatible with life after birth need to be found. METHODOLOGY/PRINCIPAL FINDINGS: We characterise a novel mouse mutant with a spontaneously arisen mutation in Plcd3 (Plcd3(mNab that resulted from the insertion of an intracisternal A particle (IAP into intron 2 of the Plcd3 gene. This mutation leads to the predominant expression of a truncated PLCD3 protein lacking the N-terminal PH domain. C3H mice that carry one or two mutant Plcd3(mNab alleles are phenotypically normal. However, the presence of one Plcd3(mNab allele exacerbates the alopecia caused by the loss of functional Plcd1 in Del(9olt1Pas mutant mice with respect to the number of hair follicles affected and the body region involved. Mice double homozygous for both the Del(9olt1Pas and the Plcd3(mNab mutations survive for several weeks and exhibit total alopecia associated with fragile hair shafts showing altered expression of some structural genes and shortened phases of proliferation in hair follicle matrix cells. CONCLUSIONS/SIGNIFICANCE: The Plcd3(mNab mutation is a novel hypomorphic mutation of Plcd3. Our investigations suggest that Plcd1 and Plcd3 have synergistic effects on the murine hair follicle in specific regions of the body surface.

  13. Preconception Health of Reproductive Aged Women of the Mississippi River Delta

    OpenAIRE

    Bish, Connie L.; Farr, Sherry; Johnson, Dick; McAnally, Ron

    2012-01-01

    Optimal preconception health (PCH) may improve maternal and infant outcomes, priority issues in Mississippi (MS). Our study objective was to compare the PCH of women in the MS Delta to other regions. We analyzed Behavioral Risk Factor Surveillance System data from 2005, 2007, and 2009, and limited analyses to 171,612 non-pregnant black and white women 18–44 years of age. Region was defined as 14 MS Delta counties (MS Delta), remainder of MS (MS non-Delta), Delta states (LA, AR, TN), and non-D...

  14. Thermodynamic evidence for phase transition in $MoO_{2-\\delta}$

    OpenAIRE

    Jacob, KT; Saji, VS; Gopalakrishnan, J; Waseda, Y.

    2007-01-01

    The standard Gibbs free energy of formation of $MoO_{2- \\delta}, \\Delta_fG^0(MoO_{2-\\delta})$, has been measured over a wide temperature range (925 to 1925) K using an advanced version of bi-electrolyte solid-state electrochemical cell incorporating a buffer electrode: $Pt\\mid Mo + MoO_{2-\\delta} \\parallel$ $(Y_2O_3)ThO_2 \\parellel (CaO)ZrO_2$ $\\parallel O_2(0.1 MPa)\\mid Pt$ The Gibbs free energy of formation of $MoO_{2-\\delta}$, which is directly related to the measured cell e.m.f....

  15. Dj Da Hai

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Miko Da Hai is DJ at a Xi’an disco bar. At work, in his cool attire, the pulsing disco beat punctuated by his distinctive vocal commentary, he makes a striking impression. The job having come his way by chance, Miko is now a skilled and experienced DJ of eight years’ standing. This may be

  16. Modeling Non-Idealities of CT Sigma-Delta Modulator for Software Defined Radio.

    Directory of Open Access Journals (Sweden)

    Mr.shailesh S.Hajare

    2013-01-01

    Full Text Available A/D conversion at an early stage plays an important role for achieving such flexibility at the receiver. Analogto-Digital-Converter (ADC constitutes a necessary component for the implementation of Software Defined- Radio (SDR receiver. The goal of this paper is to present the behavioral models, implemented in the Matlab/Simulink™ environment. The SDR toolbox allows us to simulate at behavioral level most of the switched-capacitor (SC sigma-delta (∑∆ Modulator non-idealities, such as sampling jitter, kT/C noise and operational amplifier limitations (finite bandwidth, finite DC gain, slew rate and saturation. Although very effective in simulating wide-band, medium-resolution !" converters the lack of a model for flicker noise and multi-bit quantizers makes this toolbox less attractive for simulating narrow band high resolution converters. The proposed extension not only fixes this limitation, but introduces a predictive model of the effect of capacitor mismatch in the internal multi-bit D/A converter.

  17. Investigations of (Delta)14C, (delta)13C, and (delta)15N in vertebrae of white shark (Carcharodon carcharias) from the eastern North Pacific Ocean

    Energy Technology Data Exchange (ETDEWEB)

    Kerr, L A; Andrews, A H; Cailliet, G M; Brown, T A; Coale, K H

    2006-06-08

    The white shark (Carcharodon carcharias) has a complex life history that is characterized by large scale movements and a highly variable diet. Estimates of age and growth for the white shark from the eastern North Pacific Ocean indicate they have a slow growth rate and a relatively high longevity. Age, growth, and longevity estimates useful for stock assessment and fishery models, however, require some form of validation. By counting vertebral growth band pairs, ages can be estimated, but because not all sharks deposit annual growth bands and many are not easily discernable, it is necessary to validate growth band periodicity with an independent method. Radiocarbon ({sup 14}C) age validation uses the discrete {sup 14}C signal produced from thermonuclear testing in the 1950s and 1960s that is retained in skeletal structures as a time-specific marker. Growth band pairs in vertebrae, estimated as annual and spanning the 1930s to 1990s, were analyzed for {Delta}{sup 14}C and stable carbon and nitrogen isotopes ({delta}{sup 13}C and {delta}{sup 15}N). The aim of this study was to evaluate the utility of {sup 14}C age validation for a wide-ranging species with a complex life history and to use stable isotope measurements in vertebrae as a means of resolving complexity introduced into the {sup 14}C chronology by ontogenetic shifts in diet and habitat. Stable isotopes provided useful trophic position information; however, validation of age estimates was confounded by what may have been some combination of the dietary source of carbon to the vertebrae, large-scale movement patterns, and steep {sup 14}C gradients with depth in the eastern North Pacific Ocean.

  18. Indução de resistência sistêmica à antracnose em feijoeiro-comum pela raça delta avirulenta de Colletotrichum lindemuthianum Induction of systemic resistance to anthracnose in common bean by the avirulent delta race of Colletotrichum lindemuthianum

    Directory of Open Access Journals (Sweden)

    Ângela Diniz Campos

    2009-01-01

    Full Text Available O objetivo deste trabalho foi avaliar o potencial da raça delta avirulenta do fungo Colletotrichum lindemuthianum, como protetora contra raças virulentas deste fungo e quanto à capacidade de induzir resistência sistêmica em feijoeiro-comum (Phaseolus vulgaris. Quatro cultivares de feijoeiro foram avaliadas quanto às alterações nas atividades de beta 1,3 glucanase e quitinase, em dois estádios de desenvolvimento (V2 e R6, três dias após a aplicação de suspensão de esporos de C. lindemuthianum raça delta avirulenta, em comparação com aplicações de água e ácido salicílico. As plantas foram, então, infectadas com o patótipo virulento 33/95 de C. lindemuthianum em suspensão e, depois de cinco dias, foram reavaliadas quanto à atividade das enzimas. Observaram-se acréscimos significativos nas atividades da beta 1,3 glucanase e quitinase, após inoculação do fungo indutivo, nas duas avaliações, nos dois estádios de desenvolvimento. As atividades da beta 1,3 glucanase e da quitinase variaram entre as cultivares e entre os estádios de desenvolvimento das plantas. A correlação entre o índice de severidade da doen��a e a atividade das enzimas foi altamente significativa. O uso de C. lindemuthianum raça delta avirulenta diminuiu a severidade da doença e pode ter potencial para controlar a antracnose do feijoeiro.The objectives of this work were to evaluate the potential of the avirulent delta race of Colletotrichum lindemuthianum as a protector against virulent races of this fungus and induce systemic resistance to anthracnose in common bean (Phaseolus vulgaris. Four common bean cultivars were evaluated for changes in the activities of beta-1,3-glucanase and chitinase at two common bean developmental stages, V2 and R6, three days after the infection with delta race of C. lindemuthianum, in comparison with control applications of water and salicylic acid. The plants were then infected with a spore suspension of 33

  19. Occipital intermittent rhythmic delta activity in absence epilepsy Atividade occipital delta rítmica intermitente em epilepsia ausência

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    Laura M.F.F. Guilhoto

    2006-06-01

    Full Text Available Occipital intermittent rhythmic delta activity (OIRDA is considered good prognostic factor in typical absences (TA. We report electroclinical evolution in 14 patients with TA and OIRDA, which performed video-EEG. Seven patients were female; 9 had childhood absence epilepsy and the others did not present electroclinical characteristics for syndromic classification according to ILAE's classification (1989. Pyknolepsy was referred to in 13; TA was the only seizure type in 13; one had generalized tonic-clonic seizures (GTCS and three had myoclonic jerks during TA. VPA monotherapy controlled seizures in 11, diVPA and ESM, in one each. After seizure control EEG normalized in 10 while in three, spike-wave complexes (SWC persisted, accompanied by OIRDA in one. Finally in another, seizures were not controlled and SWC and OIRDA persisted. In conclusion, we observed in this series of TA and OIRDA with onset before 10 years, pyknolepsy as common finding and few GTCS. VPA controlled seizures in most cases and EEG normalized in 76.92%. We suggest that OIRDA could be considered good prognostic factor in TA associated with SWC and of epileptiform nature leading to appropriate investigation.Atividade occipital delta rítmica intermitente (AODRI é considerada fator de bom prognóstico em crises de ausência típica (AT. Neste estudo relatamos a evolução eletroclínica de 14 pacientes com AT e AODRI que realizaram vídeo-EEG. Sete pacientes eram do sexo feminino; nove tinham epilepsia ausência da infância e os outros não apresentavam características eletroclínicas para classificação sindrômica de acordo com a classificação da ILAE (1989. Picnolepsia foi relatada em 13; AT foi o único tipo de crise em 13; um tinha crises generalizadas TCG e três, abalos mioclônicos durante AT. Monoterapia com VPA controlou as crises em 11, diVPA e ESM, em um cada. Após o controle das crises, o EEG normalizou em 10; em três, complexos de espícula-onda (CEO

  20. The duplicated longitudinal epiphysis or ''kissing delta phalanx'': evolution and variation in three different disorders

    International Nuclear Information System (INIS)

    The delta phalanx, also known as the delta bone, or longitudinal epiphyseal bracket (LEB), has been described in a variety of syndromes and dysplasias. However, the ''kissing delta phalanx'' is not as well recognized in the literature; it consists of a duplicated longitudinal bracketed epiphysis, or a complex of two adjacent delta bones, with opposing convex portions facing each other. Magnetic resonance imaging of the kissing delta phalanx has not been previously described. To describe the evolution, variation and associated osseous anomalies of the kissing delta phalanx in three patients with distinct distal limb malformations using both plain films and magnetic resonance imaging. Patient 1 had Rubinstein-Taybi syndrome and, in addition to a kissing delta phalanx in both feet, had corresponding delta metatarsals (MT1). Patient 2 had Cenani-Lenz syndactyly with distinct variation of the kissing delta phalanx in each hand. He had a disorganized appearance to the phalanges, metacarpal fusions and carpal coalitions. Patient 3 had an isolated oligosyndactyly of the left hand with metacarpal fusions and carpal coalitions. All three patients were followed over time. We describe two types of kissing delta phalanges: separated (without fusion of the corresponding epiphyseal brackets) and nonseparated (with fusion of the corresponding epiphyseal brackets). Both types can be seen in the same patient and are a reflection of the relative degree of segmentation of the two delta bones. (orig.)