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Dissertations / Theses on the topic 'Dispersão temporal'

Author: Grafiati

Published: 18 April 2022

Last updated: 18 July 2025

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1

Carvalho, Filho Ormiro Joaquim de. "Modelos matemáticos para dispersão de poluentes : análise temporal da dispersão de esgotos descartados em trechos urbanos do rio Capibaribe." Universidade Católica de Pernambuco, 2009. http://tede2.unicap.br:8080/handle/tede/610.

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Made available in DSpace on 2017-06-01T18:20:32Z (GMT). No. of bitstreams: 1 dissertacao_ormiro_joaquim.pdf: 5679183 bytes, checksum: 3a0d104e2dacca0f4988f28815256322 (MD5) Previous issue date: 2009-12-12<br>The increasing uncontrolled groundwater exploitation has been the source of many contamination and subsequent degradation problems of such systems. Techniques that allow an effective and accurate prediction of the effects over time arising from the introduction of pollutants at certain points of a system are essential for developing public policies for them sustainable exploitation, as w

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Filho, Ormiro Joaquim de Carvalho. "Modelos matemáticos para dispersão de poluentes : análise temporal da dispersão de esgotos descartados em trechos urbanos do rio Capibaribe." Universidade Católica de Pernambuco, 2009. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=617.

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A exploração crescente e desordenada de águas subterrâneas tem sido fonte de diversos problemas de contaminação e posterior degradação de tais sistemas. Técnicas que permitam uma previsão efetiva e precisa dos efeitos ao longo do tempo oriundos da introdução de poluentes em pontos determinados de um sistema são, desta forma, fundamentais para elaboração de políticas públicas de exploração sustentável dos mesmos, bem como para elaboração de metodologias de remediação e recuperação de áreas já degradadas. Portanto, o objetivo desta dissertação é gerar um sistema simplificado de gestão hídrica su

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3

Melo, Ridelson Tavares de. "Modelos matemáticos para dispersão de poluentes : análise temporal da dispersão de esgotos descartados em trechos urbanos do rio Capibaribe." Universidade Católica de Pernambuco, 2009. http://www.unicap.br/tede//tde_busca/arquivo.php?codArquivo=629.

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É inegável que o avanço da tecnologia e o desenvolvimento industrial advindo deste trazem inúmeros benefícios para a humanidade, sobretudo, no que se refere à melhoria na qualidade de vida da população em geral. De fato, tais avanços são de tal ordem presentes na vida moderna que se torna difícil imaginar a vida sem alguns destes como, por exemplo, energia elétrica e água, amplamente disponíveis, saneamento básico e sistemas de distribuição e transporte, ainda que a maior parte da população humana se distribua em grandes centros urbanos, o crescimento demanda de recursos não renováveis tais co

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Zimback, Leticia Bolian. "Quais características influenciam a limitação de dispersão de sementes em uma comunidade arbórea tropical?" Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-08032017-153207/.

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A limitação de dispersão de sementes tem sido empiricamente investigada como um mecanismo equalizador das diferenças competitivas entre espécies que coexistem em comunidades vegetais. Além da limitação espacial, as variações temporais da dispersão também podem ser importantes para a coexistência das espécies. O objetivo do estudo foi verificar a relação entre limitação de dispersão espacial (LDe) e limitação de dispersão temporal (LDt) e as características das espécies que influenciam as duas limitações. Em uma floresta da planície costeira, a chuva de sementes foi amostrada, ao longo de 36 me

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Mota, Achiles Fontana da. "Análise de propagação de pulso em meios metamateriais." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-26032015-084251/.

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Este trabalho tem por objetivo o estudo de dispersão de pulsos ultracurtos em estruturas metamateriais para a faixa de micro-ondas. Como é bem sabido, os metamateriais são estruturas altamente dispersivas em qualquer faixa de frequências. Essas características dispersivas são normalmente tratadas como deletérias para a propagação de pulsos. Entretanto, nesta dissertação é demonstrado que essas mesmas características podem produzir efeitos benéficos em certas aplicações. Para isso é realizada uma análise teórica detalhada das características de dispersão de células metamateriais de diferentes g

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Suarez, Marisol Rios 1987. "Estrutura espacial e variação temporal da chuva de sementes ornitocóricas em uma floresta ombrófila densa de terras baixas." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315901.

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Orientador: Flavio Antonio Maës dos Santos<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-27T08:26:08Z (GMT). No. of bitstreams: 1 Suarez_MarisolRios_M.pdf: 1920628 bytes, checksum: 9d3bde993f4bf8392543d78a60ad9fc2 (MD5) Previous issue date: 2015<br>Resumo: Nas florestas tropicais, cerca de 90% dos frutos produzidos são consumidos principalmente por aves, consideradas o principal agente dispersor nos trópicos. Portanto, aves exercem uma grande influência na dinâmica e estrutura das populações vegetais. A manutenção

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Santos, Junior José Carlos Benfica dos. "A dispersão temporal e espacial da dengue 4 no estado do Rio de Janeiro no período de 2011 a 2013." reponame:Repositório Institucional da FIOCRUZ, 2015. https://www.arca.fiocruz.br/handle/icict/13615.

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Made available in DSpace on 2016-04-07T13:18:42Z (GMT). No. of bitstreams: 2 103.pdf: 2012878 bytes, checksum: 1c2d47028c5fe5113df5b6ac2dae714a (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2015<br>A dengue é uma doença aguda febril transmitida principalmente pelo mosquito Aedes aegypti. No Brasil, a doença encontra-se em franca expansão, com epidemias registradas desde a década de 80. O sorotipo 4 da doença reemerge no país em 2010 e, em 2011, são identificados os primeiros casos de infecção pelo Dengue 4 na região Sudeste, no município

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Cordeiro, Thiago da Silva. "Estudo da propagação de pulsos Laser através de um sistema amplificador de pulsos ultracurtos para o desenvolvimento de um alargador temporal do tipo Öffner." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-05112009-091804/.

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Foi feito o estudo da propagação de pulsos laser através de um sistema amplificador de pulsos ultracurtos com meios dispersivos e modificadores de banda espectral. Deu-se ênfase à concepção de um alargador (ou alongador) de pulsos ultracurtos para substituir o já existente no sistema CPA híbrido de Ti:Safira/Cr:LiSAF em operação no Centro de Lasers e Aplicações do IPEN/CNEN-SP. Fez-se o desenvolvimento teórico e o estudo de um alongador temporal do tipo Öffner, livre de aberrações esféricas, objetivando obter uma razão de alargamento superior à existente no sistema em operação. Estudou-se tamb

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Camargos, Maria Gisely. "Padrão de dispersão espacial e temporal de Diachasmimorpha longicaudata (Hymenoptera: Braconidae) criado em larvas de Ceratitis capitata e Anastrepha fraterculus (Diptera: Tephritidae)." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-23032016-114303/.

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A capacidade de dispersão e parasitismo de D. longicaudata, proveniente de larvas de Ceratitis capitata (linhagem Ceratitis) e de Anastrepha fraterculus (linhagem Anastrepha) foi avaliada após liberação em pomar de goiaba. Onze liberações de cerca de 3.000 parasitoides foram realizadas entre março de 2014 e abril de 2015 no centro de um talhão de 15 ha de goiaba localizado no Projeto de Irrigação do Jaíba (15°14\'03.7\"S 43°56\'54.0\"W), em Jaíba, MG, Brasil. A dispersão foi monitorada, a partir de um ponto central de liberação, nas direções cardeais e colaterais, a uma distância de 6 m até 27

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Castro, Everaldo Rodrigo de [UNESP]. "Variação espaço-temporal na fenologia e frugivoria do palmito juçara Euterpe edulis Martius (Arecaceae) em três tipos de floresta atlântica." Universidade Estadual Paulista (UNESP), 2003. http://hdl.handle.net/11449/87874.

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Made available in DSpace on 2014-06-11T19:23:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2003-02-20Bitstream added on 2014-06-13T19:49:38Z : No. of bitstreams: 1 castro_er_me_rcla.pdf: 1833868 bytes, checksum: 9e0c129181127dd99946eb8b9b9e569a (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>O presente estudo compreende duas partes. A primeira, descreve o comportamento fenológico do palmito Euterpe edulis, e correlaciona com os fatores ambientais: temperatura e precipitação. A segunda, determina a comunidade de aves que utiliza os frutos do palmito e correlac

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Born, Priscila da Silva. "Análises filogenéticas e filogeográficas dos vírus influenza A(H3N2) papel do Brasil no cenário de dispersão global e ajuste temporal entre as cepas vacinais e os vírus circulantes no período de 1999 a 2012." reponame:Repositório Institucional da FIOCRUZ, 2013. https://www.arca.fiocruz.br/handle/icict/7700.

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Made available in DSpace on 2014-05-29T12:22:16Z (GMT). No. of bitstreams: 4 license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) 69454.pdf: 3220079 bytes, checksum: ad1e72dadcd293d4a32a15873a7c32bc (MD5) 69454.pdf.txt: 173452 bytes, checksum: 865484e8785a1ef6e4df76199b7a28d1 (MD5) 69454.pdf.jpg: 1493 bytes, checksum: f82ee0049dd9c66b2a3810a63085821e (MD5) Previous issue date: 2014-05-07<br>Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil<br>Os vírus influenza são a causa mais frequente de doença respiratória aguda com necessidade de interve

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Mahaut, Lucie. "Dynamiques temporelles de l'assemblage des communautés de plantes adventices : interactions entre pratiques agricoles et processus écologiques au cours des séquences culturales." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK004/document.

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Comprendre comment les pratiques agricoles affectent l’assemblage des communautés de plantes adventices dans les parcelles de grandes cultures annuelles est un enjeu majeur en agro-écologie. Les plantes adventices sont supposées partager certaines caractéristiques écologiques qui leur permettent de se maintenir dans les parcelles cultivées malgré les contraintes environnementales exercées par les pratiques agricoles. De plus, l'assemblage des communautés adventices est supposé dépendre d'interactions entre des processus écologiques opérant pendant une année de culture (par exemple : filtre abi

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13

Massoni, Paulo Rogério. "Determinação da concentração de elementos químicos potencialmente tóxicos em aerossóis presentes no interior de uma pequena indústria de fundição de metais, utilizando amostrador temporal e a técnica de fluorescência de raios X." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-30092009-144607/.

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Este trabalho foi desenvolvido objetivando a determinação e a avaliação dos perfis temporais da concentração de alguns elementos químicos potencialmente tóxicos presentes no material particulado em suspensão (MPS) no interior de uma pequena indústria de fundição de metais bronze, ferro e alumínio que, em concentrações elevadas, podem acarretar sérios riscos à saúde do trabalhador. Para isso foi utilizado um amostrador temporal de MPS, que coleta amostras de aerossóis em intervalo de tempo pré-programados, separando-os por tamanho: (a) fração fina ou respirável (partículas com diâmetro aerodi

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14

Collis, V. S. "Fluctuations in the temporal dispersion of muons in EAS." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380116.

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15

Zaniratto, Cristiane Patricia 1978. "Padrões espaciais e temporais da chuva de sementes zoocóricas em um mosaico de restauração de Mata Atlântica no Estado de São Paulo." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316270.

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Orientador: Wesley Rodrigues Silva<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-26T19:16:14Z (GMT). No. of bitstreams: 1 Zaniratto_CristianePatricia_M.pdf: 6906690 bytes, checksum: 61183ae4c09cd06d8858d6ee6aa85be7 (MD5) Previous issue date: 2015<br>Resumo: A degradação em florestas tropicais afeta as relações mutualísticas entre plantas e frugívoros, o que é refletido na chuva de sementes. Devido ao comportamento alimentar e à alta capacidade de deslocamento, aves e morcegos frugívoros são importantes agentes no p

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Santos, Pedro Jorge Paiva. "Análise de séries temporais em zonas costeiras e dispersão de poluentes." Master's thesis, Universidade de Aveiro, 2005. http://hdl.handle.net/10773/533.

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As regiões litorais têm constituído, nas últimas décadas, áreas privilegiadas para o êxodo ocorrido nas zonas interiores, maioritariamente rurais. Com uma localização privilegiada, as grandes cidades litorais possibilitam facilidade de acessos e comunicação aos mais variados níveis, o que as torna importantes pólos de desenvolvimento. A escolha das zonas costeiras como principal objecto de estudo, resulta não apenas da crescente proliferação de problemas de poluição atmosférica nestas regiões, como também do facto de constituírem um laboratório por excelência para a observação e estudo

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BARROS, FABRICIO JOSE BRITO. "MEASUREMENT AND ANALYZE OF UWB INDOOR CHANNEL TEMPORAL DISPERSION IN SEVERAL ENVIRONMENT TYPES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7585@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Este trabalho apresenta a análise das características de dispersão temporal do canal de propagação banda ultra larga (UWB) feitas a partir da técnica de sondagem em freqüência na banda de 850MHz em sete diferentes ambientes Indoor. Nestes ambientes os parâmetros de dispersão temporal dados pelo retardo médio, retardo RMS e banda de coerência são obtidos. Uma análise adicional sobre a perda de propagação e sobre a robustez do sinal UWB a desvanecimento de pequena escala é também realizada.<br>This work presents an analysis of

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Trippel, Tobias Daniel [Verfasser]. "Temporal and spatial dispersion of human body temperature during deep hypothermia / Tobias Daniel Trippel." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2014. http://d-nb.info/1047579154/34.

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Acker, Paul. "Life-history decisions of larids in spatio-temporally varying habitats : where and when to breed." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30024/document.

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Tout au long de leur vie, les individus sont confrontés à deux décisions qui ont des conséquences majeures sur leur succès reproducteur : où et quand se reproduire. Cette thèse étudie les mécanismes sous-jacents à ces décisions, à travers trois études basées sur des données de suivis individuels chez la mouette tridactyle (Rissa tridactyla) et le goéland railleur (Chroicocephalus genei). La première étude porte sur la dispersion chez la mouette tridactyle. La probabilité de quitter le site de reproduction est décomposée selon une structure hiérarchique des patchs d'habitat. Une hypothèse synth

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Buckwalter, Joseph Daniel. "Temporal trends in stream-fish distributions, and species traits as invasiveness drivers in New River (USA) tributaries." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64773.

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Biological invasions represent both an urgent conservation problem and an opportunity to advance ecological theory. Development of pertinent research questions and proactive management strategies require knowledge of which introduced species are present and of spatiotemporal trends in the distribution of natives and invaders. In Chapter 2 we developed a quantitative framework to identify spreaders and decliners and estimate invasion chronologies based on a historical fish presence data set for upper and middle New River (UMNR) tributaries. Our framework accounts for spatiotemporal variability

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Dhein, Guilherme. "Problemas de roteamento de veículos com dependência temporal e espacial entre rotas de equipes de campo." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/3700.

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This thesis presents two new routing problems, both with objective functions focused on relative positioning of teams during the routing horizon. The relative positioning results in temporal and spatial dependencies among routes and is quantified with a nonlinear dispersion metric, designed to evaluate the instantaneous distances among teams over a time interval. This metric allows the design of objective functions to approximate teams during routes execution, when minimized, or disperse them, when maximized. Both approximation and dispersion are important routing characteristics in some pract

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Lättman, Håkan. "Description of spatial and temporal distributions of epiphytic lichens." Licentiate thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11561.

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<p>Lichens are, in most cases, sensitive to anthropogenic factors such as air pollution, global warming, forestry and fragmentation. Two studies are included in this thesis. The first is an evaluation of the importance of old oak for the rare epiphytic lichen Cliostomum corrugatum (Ach.) Fr. This study analysed whether C. corrugatum was limited by dispersal or restricted to tree stands with an unbroken continuity or the substrate old oaks. The results provide evidence that the investigated five populations in Östergötland, Sweden, of C. corrugatum exhibit substantial gene flow, an effective di

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Silva, Danilo Balthazar. "Spatial distribution, input and dispersion of plastic pellets in coastal zones." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/21/21134/tde-16022017-102052/.

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The production and the usage of plastic material increases since the decade of 1950. Nowadays, the elevated production rate, the misusing and the waste turned plastic material in an urgent environmental and economic problem. One of the major environmental problems related to this issue is the contamination of marine environments by microplastics. These constitute plastic particles of size between 1 and 5 mm. Microplastics might occur by breaking of larger plastic pieces or as a manufactured product. The plastic pellets are among this second class, these are small plastic spherules (≥ 5 m

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Bologna, Audrey. "Impact of spatio-temporal availability of myrmecochorous seeds on the dispersal activity of Myrmica rubra ants (Hymenoptera, Formicidae)." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/242886.

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Une interaction mutualiste peut être définie comme un échange de services, qu’ils soient trophiques ou non, entre individus d’espèces différentes. La myrmécochorie est un mutualisme dans lequel les fourmis récoltent des graines portant un appendice charnu appelé élaïosome (le tout formant une diaspore), les ramènent jusqu’au nid où l’élaïosome est détaché et consommé. La graine, restée intacte, est alors rejetée du nid où elle pourra rester ou être re-dispersée par un autre vecteur avant de germer. Dans ce contexte, le comportement de récolte des fourmis envers les diaspores est décisif pour l

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Azim, Riasat. "Low-Storage Hybrid MacCormack-type Schemes with High Order Temporal Accuracy for Computational Aeroacoustics." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1515720270119389.

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Crabot, Julie. "Continuité écologique, fragmentation et dynamique spatio-temporelle des communautés en rivières intermittentes." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1319.

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L’écologie vise à comprendre comment les espèces et les individus sont distribués dans l’espace et dans le temps. De nombreux progrès ont récemment été réalisés dans l’analyse spatiale des communautés mais les mécanismes ont souvent été considérés comme à l’équilibre. Cela pourrait affecter la compréhension du rôle de processus déterministes (comme l’influence de facteurs environnementaux locaux) et stochastiques (comme une variation aléatoire du taux de mortalité) dans le maintien des écosystèmes, et d’autant plus pour les milieux dynamiques régulièrement soumis à des changements drastiques d

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Von, Eden Elric Omar. "Optical arbitrary waveform generation using chromatic dispersion in silica fibers." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24780.

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von, Zeipel Hugo. "The spatial and temporal dynamics of plant-animal interactions in the forest herb Actaea spicata." Doctoral thesis, Stockholms universitet, Botaniska institutionen, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7177.

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Landscape effects on species performance currently receives much attention. Habitat loss and fragmentation are considered major threats to species diversity. Deciduous forests in southern Sweden are previous wooded pastures that have become species-rich communities appearing as islands in agricultural landscapes, varying in species composition. Actaea spicata is a long-lived plant occurring in these forests. In 150 populations in a 10-km2 area, I studied pre-dispersal seed predation, seed dispersal and pollination. I investigated spatio-temporal dynamics of a tritrophic system including Actaea

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Aulus-Giacosa, Lucie. "Spatio-temporal evolution of life history traits related to dispersal. Brown trout (Salmo trutta L.) colonization of the sub-Antarctic Kerguelen Islands." Thesis, Pau, 2021. http://www.theses.fr/2021PAUU3003.

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Grâce à ses capacités dispersives et adaptatives, la truite commune (Salmo trutta L.), poisson anadrome facultatif, est un bon candidat à la colonisation de nouveaux milieux. L'introduction de l'espèce dans les années 1950 dans les îles subantarctiques de Kerguelen fournit un modèle d'étude unique pour comprendre les causes et les mécanismes de la dispersion, grâce à l'étude des traits d'histoire de vie en lien avec la migration (e.g. croissance, âge à la migration). L'étude de leur évolution temporelle le long d'un front de colonisation est le cœur de ce travail de thèse. A travers l’étude de

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Gerard, Pierre. "Isolement reproducteur et dispersion en zone hybride forestière: l'exemple des frênes (Fraxinus excelsior L. et F. angustifolia Vahl)." Phd thesis, ENGREF (AgroParisTech), 2006. http://pastel.archives-ouvertes.fr/pastel-00001763.

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Les zones hybrides entre taxons proches peuvent offrir un regard privilégié sur les processus évolutifs, en particulier la spéciation. L'évolution de l'isolement reproducteur dans ces zones va dépendre en grande partie de l'intensité des flux de gènes et de la valeur sélective des hybrides. Chez les arbres forestiers, les zones de contact sont souvent très étendues, étant donnés leurs larges distributions, les longues distances de dispersion de pollen et les forts taux d'allofécondation. Nous avons choisi comme modèle d'étude des deux espèces de frênes Fraxinus excelsior L. (frêne commun) et F

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Heinrich, Christophe. "Etude du rôle du "Brain-Derived Neurotrophic Factor" dans l'épileptogenèse et des mécanismes de la dispersion du gyrus denté dans un modèle d'épilepsie de la face mésiale du lobe temporal chez la souris." Strasbourg 1, 2006. http://www.theses.fr/2006STR13067.

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L'Epilepsie de la face Mésiale du Lobe Temporal (EMLT) se caractérise par un événement traumatique initial suivi d'une période latente avant l'apparition de crises récurrentes hippocampiques. Un épaississement du gyrus denté dû à la dispersion des cellules granulaires (GCD) est observé dans l'hippocampe sclérosé des patients. A l'aide d'un modèle d'EMLT obtenu par injection intrahippocampique de kainate chez la souris, nous montrons qu'une augmentation de la signalisation des récepteurs TrkB médiée par le BDNF facilite l'épileptogenèse et aggrave la sévérité des crises. De plus, la GCD ne résu

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Tornero, Pinilla Irene. "Metacommunities and biodiversity patterns in Mediterranean temporary ponds: the role of pond size, network connectivity and dispersal mode." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/670096.

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We sampled the macrofaunal metacommunities in four networks of Mediterranean temporary ponds covering a wide range of pond sizes and different spatial extents. 1) In the smallest pond network, pond size was not related to any of the environmental factors and neither to community structure but had an effect on community composition. The effect of a high connectivity could explain the absence of differences in community structure. 2) Environmental distance had larger effects than spatial distance in the decay of community similarities. In the smaller network, the biotic groups showed different d

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Riel, Louis-Philippe. "Conception d'un générateur miniaturisé d'ondes mécaniques." Mémoire, Université de Sherbrooke, 2011. http://hdl.handle.net/11143/5530.

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De nos jours, les maladies cardiaques représentent la première cause de décès dans le monde. Parmi ces maladies, les occlusions coronariennes occupent un rôle important. Aussi, 10 à 15 % de la population souffre de calculs urinaires et ces pourcentages augmentent d'année en année dans les pays industrialisés. Considérant ces données et le fait que les outils médicaux actuels ne permettent pas de répondre à l'ensemble des besoins exigés par ces domaines, il existe une opportunité intéressante pour le développement d'appareils mieux adaptés. Le présent mémoire a pour but de démontrer le potent

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Zaukevičius, Audrius. "The use of angular dispersion for formation of high peak power and ultrashort pulsed light beams in nonlinear interactions." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121227_090300-84220.

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This thesis is aimed to provide an extensive picture of the phenomena encountered in optical parametric amplification of pulsed light beams. The particular attention is paid for the spatio-temporal dynamics of the pulsed light beams being amplified. All the research has been done by means of numerical methods. The equations used in the model were derived from the Maxwell’s equations and the assumptions made along the derivation of equations were discussed. Using the presented model it has been numerically demonstrated, that in noncollinear optical parametric amplifier, when pulse fronts of pum

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Castro, Everaldo Rodrigo de. "Variação espaço-temporal na fenologia e frugivoria do palmito juçara Euterpe edulis Martius (Arecaceae) em três tipos de floresta atlântica /." Rio Claro : [s.n.], 2003. http://hdl.handle.net/11449/87874.

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Orientador: Mauro Galetti<br>Banca: Leonor Patrícia Cerdeira Morellato<br>Banca: Wesley Rodrigues da Silva<br>Resumo: O presente estudo compreende duas partes. A primeira, descreve o comportamento fenológico do palmito Euterpe edulis, e correlaciona com os fatores ambientais: temperatura e precipitação. A segunda, determina a comunidade de aves que utiliza os frutos do palmito e correlaciona a abundância das mesmas com o número de palmitos frutificando. O estudo foi desenvolvido em três formações florestais contíguas: Floresta de Restinga (nível do mar), Floresta Pluvial Tropical de Planície L

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Gérard, Pierre. "Isolement reproducteur et dispersion en zone hybride forestière : l'exemple des frênes (Fraxinus excelsior L. et F. angustifolia Vahl)." Paris, ENGREF, 2006. http://www.theses.fr/2006ENGR0002.

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Les zones hybrides entre taxons proches peuvent offrir un regard privilégié sur les processus évolutifs, en particulier la spéciation. L'évolution de l’isolement reproducteur dans ces zones va dépendre en grande partie de l'intensité des flux de gènes et de la valeur sélective des hybrides. Nous avons choisi comme modèle d'étude des deux espèces de frênes Fraxinus excelsior L. Et F. Angustifolia Vahl. Nous avons développé des marqueurs moléculaires et physiologiques discriminants, s'étant révélés être de bon outils pour l’aide au diagnostic de reconnaissance. Nous avons utilisé des marqueurs m

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Pu, Zhichao. "The assembly of protist communities: Understanding drivers of historical contingency and causes and consequences of biodiversity." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54901.

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Understanding mechanisms regulating the assembly of ecological communities is a major goal of community ecology. I combined experimental and theoretical approaches to investigate the influences of various ecological factors on the assembly of protist communities. My research included three experimental studies and one theoretical study. Two experimental studies used freshwater heterotrophic ciliated protists as model organisms to examine how species dispersal across local communities and functional and phylogenetic diversity of the species pool influence historical contingency of the assembled

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Kernehan, Colleen D. "Determination of the fine scale, temporal pattern of larval release by female blue crabs and application of this information to mathematical models of larval dispersal and recruitment." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 1.71 Mb., 74 p, 2006. http://wwwlib.umi.com/dissertations/fullcit/1435933.

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HASAN, KHALID. "STUDY OF SPATIAL/TEMPORAL PATTERNS OF RADON RELEASES FROM THE K-65 SILOS, USING DISPERSION MODELING AND GIS: A CASE STUDY AT THE DEPARTMENT OF ENERGY'S FERNALD ENVIRONMENTAL MANAGEMENT PROJECT, CINCINNATI, OHIO." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1008268951.

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Nikkhah, Hamdam. "Enhancing the Performance of Si Photonics: Structure-Property Relations and Engineered Dispersion Relations." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37144.

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The widespread adoption of photonic circuits requires the economics of volume manufacturing offered by integration technology. A Complementary Metal-Oxide Semiconductor compatible silicon material platform is particularly attractive because it leverages the huge investment that has been made in silicon electronics and its high index contrast enables tight confinement of light which decreases component footprint and energy consumption. Nevertheless, there remain challenges to the development of photonic integrated circuits. Although the density of integration is advancing steady and the integra

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Linget, Héloïse. "Programmation de cristaux dopés en ions terres rares pour le traitement du signal : application au renversement temporel et à l'analyse spectrale large bande instantanée de signaux RF." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS132/document.

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Dans de nombreux systèmes de traitement de l'information, le signal est numérisé, traité informatiquement, puis reconverti dans le domaine analogique. La faible bande passante de ces étapes de conversion numérique/analogique limite considérablement le débit d'informations traitées. Une solution purement analogique améliorerait donc considérablement le temps de traitement et la bande passante. Notre approche consiste à transférer le signal RF à traiter sur une porteuse optique puis à procéder à son traitement dans le domaine optique. L'étape de traitement est assurée par la traversée d'un crist

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Li, Ji. "Modèle dans le domaine temporel et la validation expérimentale d’un scanner ultrasonore à ondes de surface sans contact." Thesis, Ecole centrale de Lille, 2017. http://www.theses.fr/2017ECLI0026/document.

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Ce travail de recherche propose l’algorithme de calcul pour la modélisation d’un scanner ultrasonore sans contact à ondes de surface. L’approche proposée permet de prendre en compte l’ouverture finie du récepteur, l’atténuation d’air et la réponse électrique he de l’ensemble émetteur-récepteur. Le milieu avec l’atténuation (air et milieu testé) est modélisé dans le domaine temporel à l’aide de la fonction de Green causale permettant la caractérisation large bande. Le réponse he est déterminée de manière expérimentale en utilisant la procédure spatialement développée, incluant la déconvolution

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Hasan, Khalid. "Study of spatial/temporal patterns of radon releases from the K-65 silos, using dispersion modeling and gis a case study at the department of energy's Fernald environmental management project, Cincinnati, Ohio. /." Cincinnati, Ohio : University of Cincinnati, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1008268951.

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Östergård, Hannah. "Plant-seed predator interactions – ecological and evolutionary aspects." Doctoral thesis, Stockholm University, Department of Botany, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7537.

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<p>Plant-animal interactions are affected by both abundance and distribution of interacting species and the community context in which they occur. However, the relative importance of these factors is poorly known. I examined the effects of predator host range, environmental factors, host plant populations, plant traits and fruit abortion on the intensity of pre-dispersal seed predation in 46 host populations of the perennial herb <i>Lathyrus vernus</i>. I recorded damage by beetle pre-dispersal seed predators, mainly <i>Apion opeticum </i>and <i>Bruchus atomarius</i> with different host ranges

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Rudhall, Andrew Peter. "Ultrashort laser pulse shaping for novel light fields and experimental biophysics." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3682.

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Broadband spectral content is required to support ultrashort pulses. However this broadband content is subject to dispersion and hence the pulse duration of corresponding ultrashort pulses may be stretched accordingly. I used a commercially-available adaptive ultrashort pulse shaper featuring multiphoton intrapulse interference phase scan technology to characterise and compensate for the dispersion of the optical system in situ and conducted experimental and theoretical studies in various inter-linked topics relating to the light-matter interaction. Firstly, I examined the role of broadband ul

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C?mara, Thanyria Pollyneide Fran?a. "Demografia de Tangara cayana (Aves: Thraupidae) em um fragmento de restinga no extremo Norte de distribui??o da Mata Atl?ntica." PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS BIOL?GICAS, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/24061.

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Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-04T22:24:00Z No. of bitstreams: 1 ThanyriaPollyneideFrancaCamara_DISSERT.pdf: 771319 bytes, checksum: 376574cb318a326fcae315833f49b6e5 (MD5)<br>Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-13T22:01:35Z (GMT) No. of bitstreams: 1 ThanyriaPollyneideFrancaCamara_DISSERT.pdf: 771319 bytes, checksum: 376574cb318a326fcae315833f49b6e5 (MD5)<br>Made available in DSpace on 2017-10-13T22:01:35Z (GMT). No. of bitstreams: 1 ThanyriaPollyneideFrancaCamara_DISSERT.pdf: 771319 bytes,

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Silva, Kelly Cristina Ramos da. "Análise da qualidade do ar : um estudo de séries temporais para dados de contagem." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/4573.

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Made available in DSpace on 2016-06-02T20:06:08Z (GMT). No. of bitstreams: 1 5213.pdf: 2943691 bytes, checksum: 6d301fea12ee3950f36c4359dd4a627e (MD5) Previous issue date: 2013-04-30<br>Financiadora de Estudos e Projetos<br>The aim of this study was to investigate the monthly amount of unfavourable days to pollutant dispersion in the atmosphere on the metropolitan region of S ão Paulo (RMSP). It was considered two data sets derived from the air quality monitoring on the RMSP: (1) monthly observations of the times series of annual period and (2) monthly observations of the times series of per

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Nemati, Navid. "Theorie macroscopique de propagation du son dans les milieux poreux 'à structure rigide permettant la dispersion spatiale: principe et validation." Phd thesis, Université du Maine, 2012. http://tel.archives-ouvertes.fr/tel-00848603.

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Ce travail présente et valide une théorie nonlocale nouvelle et généralisée, de la propagation acoustique dans les milieux poreux à structure rigide, saturés par un fluide viscothermique. Cette théorie linéaire permet de dépasser les limites de la théorie classique basée sur la théorie de l'homogénéisation. Elle prend en compte non seulement les phénomènes de dispersion temporelle, mais aussi ceux de dispersion spatiale. Dans le cadre de la nouvelle approche, une nouvelle procédure d'homogénéisation est proposée, qui permet de trouver les propriétés acoustiques à l'échelle macroscopique, en ré

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Luther, Stefan. "Theoretische Beschreibung und experimentelle Untersuchung raum-zeitlicher Strukturbildung in akustischen Kavitationsblasenfeldern." Doctoral thesis, [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961894121.

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Sarremejane, R. (Romain). "Community assembly mechanisms in river networks:exploring the effect of connectivity and disturbances on the assembly of stream communities." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526218632.

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Abstract Community assembly results from a combination of deterministic and stochastic mechanisms, whose relative effects can vary in response to environmental heterogeneity, connectivity, disturbance regimes and anthropogenic stressors. Understanding how community assembly mechanisms vary in response to environmental changes and connectivity is crucial for the management and conservation of river ecosystems. In this thesis, I tested the effects of connectivity and natural flow disturbances on riverine invertebrate communities by assessing assembly mechanism changes in response to (I) habitat

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