Thèses sur le sujet « Dispersal event »
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Smith, David A. « An integrated approach to evaluating the environmental impact following a radiological dispersal event ». Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1148312072.
Texte intégralScarboro, Sarah Brashear. « The use of a thyroid uptake system for assaying internal contamination following a radioactive dispersal event ». Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22639.
Texte intégralCommittee Chair: Nolan Hertel; Committee Member: Armin Ansari; Committee Member: Chris Wang; Committee Member: Rebecca Howell.
Bridges, Ashby H. « Estimating the radiation dose to emergency room personnel in an event of a radiological dispersal device explosion ». Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-08242006-142548/.
Texte intégralDr. Armin J. Ansari, Committee Member ; Dr. Farzad Rahnema, Committee Member ; Dr. Rebecca Howell, Committee Member ; Dr. Nolan E. Hertel, Committee Chair.
Censullo, Shaolin Meliora. « Did Alternating Dispersal and Vicariance Contribute to Increased Biodiversification During the Great Ordovician Biodiversification Event ? : A Phylogenetic Test Using Brachiopods ». Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1586947231228706.
Texte intégralTeague, Kara Elizabeth. « Environmental Ramification of the Fire Ecology of Slash Pine (Pinus elliottii) : A Study of Population Dynamics and Dispersal following a Fire Event ». Scholar Commons, 2003. https://scholarcommons.usf.edu/etd/1491.
Texte intégralTeague, Kara Elizabeth. « Environmental ramifications of the fire ecology of slash pine (Pinus elliottii) a study of population dynamics and dispersal following a fire event / ». [Tampa, Fla. : s.n.], 2003. http://purl.fcla.edu/fcla/etd/SFE0000089.
Texte intégralTeague, Kara Elizabeth. « Environmental ramification of the fire ecology of slash pine (Pinus elliottii) [electronic resource] : a study of population dynamimcs and dispersal following a fire event. / by Kara Elizabeth Teague ». University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000089.
Texte intégralDocument formatted into pages; contains 78 pages.
Thesis (M.S.)--University of South Florida, 2003.
Includes bibliographical references.
Text (Electronic thesis) in PDF format.
ABSTRACT: With increasing encroachment on natural communities by anthropogenic activity, it is important to understand the functions of natural ecosystems in an effort to conserve natural areas. A first-hand study of the population dynamics of South Florida Slash Pine (P. elliottii Engelm. var. densa) following a fire event provided insight to its recovery and dispersal following a fire. A natural fire (lightning-induced) occurred in the spring of 2000 at the T. Mabry Carlton, Jr. Reserve, Sarasota County, providing an opportunity to study aspects of slash pine in relation to fire. One objective of my research was to look at dispersal/recruitment conditions and slash pine dynamics in relation to fire. I looked at the varying degrees of tree mortality due to fire at different stands of slash pines.
ABSTRACT: I also looked at the stands in terms of stand composition and spatial arrangement of surviving adults. Finally, I studied how variable seedling establishment and survival was between stands. Few inferences could be drawn between fire and these individual analyses; however, all analyses revealed that at the scale of this study, pine flatwoods are patchy. I also looked at the dispersal of slash pines following a fire event. I modeled my research after Ribbens et al. (1994) and Clark et al. (1998), who took a phenomenological approach to dispersal modeling. This approach involved using distances between adults and seeds/seedlings and fecundity of adults to create dispersal models based on maximum likelihood estimates (MLE). I found that, while I could predict a model within acceptable parameters for most of the stands, more data was needed to predict models that better fit the data.
ABSTRACT: This finding, along with the fact that I recovered no seed data for analysis, suggests factors are contributing to dispersal and recruitment (e.g. cone-crop) that need to be accounted for in the future.
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Dewji, Shaheen Azim. « Assessing internal contamination after a radiological dispersion device event using a 2x2-inch sodium-iodide detector ». Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28092.
Texte intégralBRANDINI, STEFANIA. « Employing mitogenomes to reconstruct migration and dispersal events ». Doctoral thesis, Università degli studi di Pavia, 2017. http://hdl.handle.net/11571/1203286.
Texte intégralCardenas, Leyla. « Dispersal ability and genetic structure in Concholepas concholepas (Bruguiière, 1789) : effects of historical and contemporary events ». Paris 6, 2007. http://www.theses.fr/2007PA066405.
Texte intégralBased on the study of the marine gastropod Concholepas concholepas, spread along the Chilean coasts, this thesis aimed at examining the correlation between biogeographic and phylogeography patterns and the role played by the present-day dispersal on the maintenance of the historical population structure. On an historical time scale, the analysis of sequences of a mitochondrial DNA gene (COI) on ca. 400 individuals from 14 localities along 4000 km of coastline revealed a rapid demographic and geographic expansion. On a contemporary time scale, the use of 11 microsatellites showed that the effective dispersal represents only a fraction of the potential larval ability previously hypothesized based on the pelagic larval duration: dispersal strongly vary according to hydro-dynamic patterns (retention zone) and habitats (fjords vs. Linear coasts). The results of this thesis have implications on management and conservations policy applied to C. Concholepas
Mokhtar-Jamai, Kenza. « Biologie de la conservation de la gorgone rouge de Méditerranée, Paramuricea clavata, dans le contexte actuel du changement climatique ». Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22065.
Texte intégralThe red gorgonian, Paramuricea clavata (Cnidaria, Octocorallia), is a sessile, long-lived and slow growing species which displays slow population dynamics. This species is characterized by a pelagic larval phase that represents the sole potential phase of dispersal during the life cycle of this species. P. clavata is a key species of coralligenous assemblages of the Mediterranean Sea which undergoes the combined effects of diving activities and climate change. In this context, extending the knowledge about life history traits, biology and ecology of the red gorgonian was of fundamental importance. Using a genetic approach, the goal of this work was to study some key biological and ecological factors which should be important for the response of this species to environmental changes. Among these factors, larval dispersal plays a major role in driving marine population dynamics and connectivity. In the current context of strong anthropic pressures, understanding the level of population connectivity is primordial to evaluate population outcome, facing climate change, and to develop conservation plans as well as to design marine reservenetworks
Young, Elizabeth Anne. « Monitoring and measuring the impacts and environmental implications of flood events on contaminated sediment dispersal in the River Swale catchment, North Yorkshire ». Thesis, University of Central Lancashire, 2006. http://clok.uclan.ac.uk/20036/.
Texte intégralFigueiredo, Wallace Torres de. « Elucidation of catalytic events at atomic level in CuNi1-/CeO2 (0<<1) nanoparticles applied to the reverse water-gas shift (RWGS) reaction ». reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/169734.
Texte intégralThe CO2 molecule is the main responsible for the negative consequences of the greenhouse effect. The increasing numbers associated to the amount of CO2 emission in the atmosphere have attracted the attention of scientists aiming the discovery of new catalysts to CO2 dissociation reactions. At the same time, several atomic events may influence the catalytic properties of such systems, like the Strong Metal-Support Interaction (SMSI) effect and atomic rearrangement when the bimetallic nanoparticles (NPs) are exposed to a gaseous atmosphere. This work presents the results of a study about the behavior of CuNi1-/CeO2 (0<<1) NPs during the H2 reduction treatment (step used in the activation of the catalysts) followed by the reverse water-gas shift (RWGS) reaction. The samples were initially characterized in terms of their compositions, chemical components, atomic arrangement and sizes, using the Energy Dispersive X-ray Spectroscopy (EDS), X-Ray Photoelectron Spectroscopy (XPS) and Transmission Electron Microscopy (TEM) techniques. Afterwards, these samples were heated to 500 ∘C in a H2 atmosphere. At 500 ∘C the samples were exposed to H2 and H2+CO2 atmospheres. During all these treatments, the samples were characterized in situ by Near Ambient Pressure XPS (NAP-XPS) with incident photon energies of 1250 eV and 2000 eV, X-ray Absorption Spectroscopy (XAS) and time-resolved XAS techniques in transmission mode at the Cu K (8979 eV), Ni K (8333 eV) and Ce L3 (5723 eV) edges. The in situ measurements performed showed a copper (nickel) migration to the nanoparticles surface during H2 (H2+CO2) gaseous treatment. Moreover, the Cu surface atomic population is dependent on the Cu amount used in the synthesis process. The higher concentration of Cu during the synthesis implies in a smaller Cu surface atomic population during H2 reduction and RWGS reaction. The occurrence of the geometrical factor of the SMSI effect, characterized by a cerium oxide capping layer surrounding the nanoparticles during reduction treatment, was observed for some of the NPs, revealing the existence of a threshold in the Cu concentration to occur the SMSI effect. Only nanoparticles with high amounts of Cu present the SMSI effect during the H2 reduction treatment. The surface of the nanoparticles presenting the SMSI effect is recovered to the initial state (free of the capping layer) after inserting the CO2 atmosphere. Moreover, the nature of the SMSI effect was elucidated for the first time: the capping layer interacts with the Cu and Ni atoms via Ce3d10O2p6Ce4f0 and Ce3d10O2p6Ce4f1 initial states, depending on the case studied. As a consequence of the SMSI effect, the Cu atoms of the nanoparticles reduce earlier (lower temperature) than similar nanoparticles that do not present the SMSI effect. The reactivity results towards the CO formation in the RWGS reaction, associated to the catalytic events at atomic level observed (SMSI effect, surface atomic population, change on the oxidation state of the catalysts) led to the design of an optimized catalyst applied to this reaction. The capping layer of the SMSI effect has a negative influence on the reactivity results. The migration of Ni atoms to the surface led to a decrease of the catalyst reactivity in the RWGS reaction. Based on these results, it is proposed a synthesis of nanoparticles with a high amount of Ni in order to avoid the SMSI effect and to allow a high Cu surface atomic population during the RWGS reaction, both playing a key role in the reactivity results towards the RWGS reaction.
Manente, Zuleica Maria Queiroz Guimar?es. « O Shopping Iguatemi em Campinas e a sociedade de consumo da urbaniza??o dispersa ». Pontif?cia Universidade Cat?lica de Campinas, 2017. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/939.
Texte intégralMade available in DSpace on 2017-04-05T17:01:03Z (GMT). No. of bitstreams: 1 ZULEICA MARIA QUEIROZ GUIMAR?ES MANENTE.pdf: 19864474 bytes, checksum: ba4fb840faf0d8656ea19f3903c0d0de (MD5) Previous issue date: 2017-02-22
This research investigates the present-day metropole (Metropolitan Area of Campinas) focusing on the dispersed urbanization and the urbanization process, as a part of which themall Shopping Iguatemi was built in the city of Campinas, considering it an indicator of regional sca/e dynamics, but with deep implications to the city and the local environment. Since Iguatemi opened its doors, almost three and a half decades ago, some changes have been happening in the city's dynamics, as much in the population profile as in its behavior, such as purchasing habits, culture and local and regional trade. There's an upper and middle class consumer displacement from downtown to the ma 11, as well as the pendulum-like motion of the Metropolitan Area of Campinas' population in pursue of new consumption options. Given this migration from downtown and Metropolitan Area of Campinas to the margins of the urban area (city expansion zone), some residential enterprises and business have a/so been built around Iguatemi. Since its opening, Iguatemi has been through five expansions and will soon build a residential complex as part of a larger project aiming the densification of its surroundings. The enterprise's primary expansions have been defined, in a way, by the new re/ationships amongst the city and the Metropolitan Area of Campinas, by the need to innovate in order to attract the consumer given the implementation of another eight malls in the c?ty, and the new consumption habits defined by the contemporary life in constant search for entertainment, leisure and specialized trade. This research is based on bibliographica/, documental and joumalistic sources, and it addresses how Shopping Iguatemi has been backing the dispersion of the eastem zone of Campinas in the last thirty-five years, given the rapid changes in the characterization of the urban environment. It a/so analyzes how entrepreneurs have identified market opportunities in this new consumer society, offering new leisure altematives to fulfill the demando This process has been happening since the 80s and it has been changing its outlines since the late 20th century.
Este trabalho investiga a metr?pole contempor?nea (Regi?o Metropolitana de Campinas) com enfoque na urbaniza??o dispersa e no processo de urbaniza??o no qual se insere o Shopping Iguatemi na cidade de Campinas, considerando este como ind?cio de din?micas na escala regional, mas com profundas implica??es para a cidade e para o contexto local. Nota-se que, a partir da inaugura??o do Shopping Iguatemi, ocorrida h? quase tr?s d?cadas e meia, algumas mudan?as foram ocorrendo na din?mica da cidade, tanto no perfil da popula??o, como nos costumes, com novos h?bitos de consumo, cultura e no com?rcio local e regional. Percebe-se um deslocamento do p?blico consumidor das classes alta e m?dia das ?reas centrais para o shopping, bem como a mobilidade pendular da popula??o da Regi?o Metropolitana de Campinas em busca de novas formas de consumo. Com essa migra??o do centro e da Regi?o Metropolitana de Campinas para as adjac?ncias da malha urbana (?reas de expans?o da cidade), alguns empreendimentos residenciais e estabelecimentos comerciais tamb?m come?aram a despontar na regi?o pr?xima ? localiza??o do Iguatemi. Desde a sua origem, o Shopping Iguatemi passou por cinco expans?es e em breve implantar? um novo complexo residencial como parte de um projeto maior para adensamento do seu entorno. As principais amplia??es do empreendimento foram determinadas, em parte, pelas novas formas de relacionamento entre a cidade e a Regi?o Metropolitana de Campinas, pela necessidade de inova??o para atrair o p?blico consumidor frente as implanta??es de mais oito shoppings no munic?pio e pelos novos h?bitos de consumo definidos pela vida contempor?nea em busca de alternativas de entretenimento, lazer e com?rcio especializado. Esta pesquisa foi embasada em fontes bibliogr?ficas, documentais e jornal?sticas e aborda como o Shopping Iguatemi vem contribuindo para a dispers?o da regi?o leste da cidade de Campinas nos ?ltimos trinta e cinco anos, tendo em vista as aceleradas mudan?as na configura??o do espa?o urbano. Analisa tamb?m como os empreendedores?investidores identificaram as oportunidades de mercado nessa nova sociedade de consumo oferecendo eventos de lazer para atender a demanda. Esse processo vem ocorrendo desde a d?cada de 1980 e atinge novos contornos no final do s?culo XX e na atualidade.
Kano, Célia Hanako. « Modelagem e análise das cadeias de suprimentos globais e resilientes baseadas em rede de Petri ». Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-16062016-144200/.
Texte intégralIn a context of increasing competition, rising of expectations for product innovations and need to satisfy different consumer needs, the concept of global supply chain management (GSCM) emerges as a strategy to more efficiently coordinate the geographically dispersed activities of production systems. Adopting GSCM, organizations have to deal with external disruptions that impact management activities, such as transport interruption, power supply failure, natural disasters and terrorist attacks. In this way, a systematized procedure for modeling supply chains as a discrete event system and simulation analysis of GSCM activities based on formal techniques, such as Petri net (PN) and Production Flow Schema (PFS) is introduced. An example is also presented to illustrate and confirm the advantages of the proposed method for GSCM analysis.
Krosch, Matthew Neil. « Evolutionary biology of Gondwanan non-biting midges (Diptera : Chironomidae) ». Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/41749/1/Matthew_Krosch_Thesis.pdf.
Texte intégralTSIKARIDZE, NIKOLOZ. « The ecology of dispersal in early Homo species ». Doctoral thesis, 2014. http://hdl.handle.net/2158/987406.
Texte intégralSymons, Celia Claire. « Windows of opportunity : the timing of dispersal events influences zooplankton community response to environmental change in Subarctic ponds ». Thesis, 2012. http://hdl.handle.net/1974/7472.
Texte intégralThesis (Master, Biology) -- Queen's University, 2012-09-17 12:18:16.015