Dissertations / Theses on the topic 'Cap seal'
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Espinoza, David Nicolas. "Carbon geological storage - underlying phenomena and implications." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42701.
Full textKarlsson, Emil, and Pettersson Anja. "Modifierad konstruktion av plastkapsyl för förbättrad tätning." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104879.
Full textTo prevent the contents of a container from leakage the closure of the container mustbe sealed. Some kind of seal is used to prevent leakage. The sealing part of plastic caps is usually integrated in the design of the cap in form of lips or edges that areputting pressure against the bottle.The study refers to the integrated seal on a “push-on” cap that is made of Polypropylene copolymer. The cap is manufactured by Emballator Växjöplast AB and is called DLM (dropless medicine) since it is mounted to a glass or plastic bottle containing medicine in most cases. The bottom part of the cap is pressed onto the bottle permanently and the two-part design works through a separate top part that is screwed onto the bottom part.The study contains product development steps to create an updated design that manages the problems caused by the profile of the bottle. The study is laid out as a DRM-study that is trying to answer what is affecting a cap´s ability to seal and how the sealing elements can be designed to neutralize the shape of the bottle. The problems are appearing mostly when the cap is mounted to the glass bottle and is rotated, since the bottle in some cases has an oval profile. It is when the bottle is rotated that the seal is not adapting fast enough to become sealed again.Through the process of the study, it has been realized that it is better to place a second seal on top of the bottle instead of designing a seal that follows the shape of the container. This is done to reduce the risk of plastic deformation due to relaxation of the material. The surface at the top of the bottle is utilized, since it is an unoccupied space at both the cap and the bottle, to have the seals complete each other. This is done to be able to keep the current seal and just add a top-seal that is less sensitive for ovality of the bottle. The results of the study should be seen as a basis for production of prototypes and testing since it not possible to guarantee the capability of the design without continued testing.
Engström, Joel. "A lone SEAL : What Failure can tell us." Thesis, Försvarshögskolan, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-9965.
Full textFernández, Cranz Matías, and Hampus Olsson. "Design and development of a power seat structure for a sports car." Thesis, Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44880.
Full textSantos, Hélder Guimarães de Oliveira. "Portuguese sell-side analysts' reports: can they deliver?" Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7878.
Full textThis paper studies the importance of Portuguese financial sell-side analysts’ reports by testing reliability in firms’ Price Target calculation and information aptitude (deliver ability) in the content of sell-side analysts’ reports. The importance of sell-side analysts reports has long been studied, mainly in two different perspectives: the consequences of their work (market price reactions, trading strategies based in analysts’ recommendations) and the externalizations that influence their work (herding and bias behaviors). We believe that before either perspective can explain their value, analysts through their reports should be able to deliver the information users need and offer coherent calculation that justifies the Price Targets. We explore and encode the complete content of 73 reports from PSI20 listed companies, and apply consistency and reliability procedures to test them. Informativeness is tested against an ideal report (built mainly from the Jenkins Report conclusions). To test reliability in the Prices Targets calculations we investigate if the method and the parameters of the evaluation are clearly disclosed and if the calculative procedure is according to the theoretical conventions.
O presente trabalho propõe-se avaliar a importância dos analistas financeiros Portugueses testando para isso a fiabilidade no cálculo dos Price Targets e a capacidade informativa dos relatórios que produzem. A utilidade dos analistas financeiros tem sido há muito estudada, por norma através de duas perspectivas: avaliando as consequências do seu trabalho (reacção dos mercados às suas recomendações e estratégias de investimento baseadas nessas mesmas recomendações) e por outro lado considerando as variáveis exógenas que influenciam o seu trabalho (comportamentos tendenciosos e de “arrebanhamento”). Acreditamos que antes de avaliar a pertinência destas perspectivas, importa averiguar se através dos relatórios que produzem os analistas financeiros fornecem a informação que os seus utilizadores necessitam. Para isso examinamos e codificamos 73 relatórios financeiros de empresas que integram o PSI20, testando-os em termos de informatividade e fiabilidade. A capacidade informativa é testada em confronto com um relatório ideal (baseado nas conclusões do Relatório Jenkins). Para testar a confiabilidade no cálculo dos Price Targets investigamos se o método e os parâmetros utilizados são expressos com clareza e se o processo de cálculo está em conformidade com aquilo que são os princípios teóricos aceites.
Abrakasa, Selegha. "Leakage through petroleum cap rocks : UK and the Norwegian sectors of the North sea." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500909.
Full textVasconcelos, MÃrcio Anderson Guedes. "Estudo sobre o emprego do CAPE SEAL em revestimentos rodoviÃrios do estado do CearÃ." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10934.
Full textOs tratamentos de superfÃcie se apresentam como um dos tipos de revestimentos asfÃlticos mais aplicados em pavimentos flexÃveis nas rodovias brasileiras. Isso se deve a sua utilizaÃÃo na construÃÃo de rodovias de baixo e mÃdio volume de trÃfego, bem como na conservaÃÃo e manutenÃÃo de pavimentos existentes. Dentre os tratamentos de superfÃcie, destacam-se o Tratamento Superficial Simples (TSS) e Duplo (TSD), que juntos representam 63% da malha rodoviÃria pavimentada do estado do CearÃ, e o Microrrevestimento AsfÃltico (MRAF), cuja aplicaÃÃo tem crescido ao longo dos anos. A junÃÃo do TSS e MRAF à conhecida como Cape Seal (CS) e tem como diferencial reunir caracterÃsticas de ambos os tratamentos, entretanto, sem aplicaÃÃo conhecida em rodovias cearenses. A dissertaÃÃo tem como objetivo geral desenvolver um programa experimental que avalie o desempenho do CS em laboratÃrio para um agregado mineral (AM) e um agregado siderÃrgico (AS). Na metodologia desenvolvida no estudo, dividiu-se o programa laboratorial em quatro procedimentos experimentais que conduziram o desenvolvimento da pesquisa desde a caracterizaÃÃo dos materiais utilizados, moldagem e dosagem dos corpos de prova, atà a realizaÃÃo dos ensaios de desempenho e avaliaÃÃo dos pavimentos testados em um simulador de trafego de laboratÃrio. Os resultados da caracterizaÃÃo do AS atenderam com seguranÃa aos parÃmetros recomendados pelas especificaÃÃes tÃcnicas. Os corpos de prova confeccionados com agregado siderÃrgico e submetidos ao simulador de trÃfego apresentaram resultados melhores do que o agregado mineral quanto à avaliaÃÃo ao desgaste, deformaÃÃo e rugosidade, indicando assim a potencialidade do AS em tratamentos do tipo CS e TSD. Observou-se, diante do programa experimental executado, que o cape seal quando comparado ao TSD atravÃs de parÃmetros tÃcnicos e econÃmicos, apresentou uma melhor capacidade de absorÃÃo de cargas, maior qualidade de rolamento e menor desgaste. Entretanto, quanto ao aspecto de custos, a aplicaÃÃo do CS deve ser analisada cuidadosamente diante da viabilidade do projeto. Acredita-se que o cape seal seja aconselhÃvel para rodovias que necessitem de um revestimento de melhor qualidade quando comparado ao TSD
Wickens, Patricia Anne. "Interactions of the South African fur seal and fisheries in the Benguela ecosystem." Doctoral thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/22566.
Full textThis thesis adopts an holistic approach to evaluation of the "seal problem", which encompasses the operational and biological interactions between the South African fur seal and fisheries in the Benguela Ecosystem. The operational interactions are examined using a qualitative assessment, and speculative, single-species simulation models are developed to improve understanding of seal population dynamics, present options for seal management and explore seal-fishery interactions. The models show that the probability of a seal living longer than 20 years is 14%; that the population has increased at a rate of 5.1 % p.a. since the last major census in 1983; that in 1988 there were an estimated 1.5 million seals that consumed over 2 million tons of fish; that although seal population size is usually estimated by multiplying the number of pups by a factor of 4, this factor is very variable and under different culling regimes is usually greater than 4; that historically, the mean population : pup ratio is 4.55. The most effective means of reducing the population is to cull both pups and bulls (the population decrease resulting mainly from reduced pup production caused by disturbance during bull culling). Culling pups is the least effective means of population control. Culling cows alters the population sex ratio drastically and is considered undesirable. To achieve a small or negative population growth rate, more bulls and pups need to be culled than have been taken historically. Each of the fisheries is found to be subject to operational interactions with seals, this being most severe for the purse-seine fishery. The per capita consumption of fish by seals is similar under any management regime so it is not justified to adopt a particular culling strategy to reduce overall consumption. When either seal predation or fishing mortality is reduced, the model simulates an increase in fishery yield of Cape hakes. But there is inadequate understanding of hake population dynamics at present, and depending on the interactions between species, decreased predation may result in increased or decreased fishery yields. This study shows that operational interactions are a real problem and this biases the opinion of fishermen towards seals as competitors for fish resources.
Bond, Katherine J. "Mudstone cap rocks as vertical migration pathways : case studies from the Norwegian sector of the North Sea." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366524.
Full textLloyd, Jeremy. "The palaeoceanography and glacial history of the Greenland Sea and Spitsbergen Ice Cap over the last 200ka." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/12450.
Full textGoh, Jeffrey Mau Seong. "The principles and policies of regulating airline competition." Thesis, University of Sheffield, 1999. http://etheses.whiterose.ac.uk/6030/.
Full textKhan, Sehra Y. "Can young people's emotional intelligence be promoted through the secondary school's Social and Emotional Aspects of Learning (SEAL) Programme?" Thesis, University of Southampton, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533243.
Full textNsanta-Kalimukwa, Natasha. "Trade liberalisation vs public morality : can the European Union seal ban be justified under the GATT Article XX (a)?" Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/12892.
Full textThe objective of the research is to assess the strength of a potential exception available to the EU under Article XX (a) of the GATT. This is not the first time that issues to do with animal welfare are being challenged at the WTO dispute settlement system. Animal welfare issues have been at the centre of conflicts from the times of the GATT through to the creation of the WTO. For example, in 1993 a dispute arose when the U.S. adopted a law known as the U.S. Marine Mammal Protection Act which established standards of harvesting tuna using purse seine nets to prevent the unnecessary killing of dolphins. This law entailed that if a country exporting to the U.S. did not meet the standards as specified in the law, the tuna would be embargoed. The Panel ruled against the U.S although the panel report was never adopted because under the old GATT regime, a decision could be blocked by a member state that was unhappy with the decision and the U.S. blocked its adoption. This scenario is no longer possible because under the WTO because of the negative consensus principle. Further, in 1997, under the United States Endangered Act of 1973, the U.S. imposed a ban on the importation of certain shrimp and shrimp products that were not caught using turtle excluding devices (TED)in their nets when fishing in areas where there a significant likelihood of encountering sea turtles. Although the two cases were brought under Article XX (b) exception, they are still important for the seals case because the main reason the products were banned was because the countries who adopted the bans did not subscribe to the methods used in the hunting which raised concerns in their countries. Seals have also come under contention before when in 1983 the EU banned products from ‘whitecoats’ and bluebacks’ a species of seals also known as harp and hooded seals respectively that have not yet been weaned as a result of concerns over their conservation status. The current seal dispute is therefore important for two reasons. Firstly the study is ofparticular importance because the moral exception under GATT is rarely invoked. It will be the third dispute under the GATT specifically to invoke the public morals exception and the second dispute under the WTO. So there has not been a lot of adjudication on the exception. Secondly, it is the first time that a dispute panel at the WTO is adjudicating upon a trade measure adopted for the protection of animal welfare by a Member State purely based on moral beliefs and indignation.
Muller, Cornelius Marthinus. "The phylogeographic population structure of the Cape sea urchin, Parechinus angulosus." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/6899.
Full textENGLISH ABSTRACT: South Africa's coastline is in the region of 3650kms and encompasses many different and dynamic marine environments. To enhance our current understanding of the population structure and gene flow patterns of intertidal zone marine species in this region, this study sets out to investigate the phylogeographic population structure of the Cape sea urchin, Parechinus angulosus, using mitochondrial and nuclear DNA sequence data collected in 2007 and 2008. Individuals were sampled from 18 geographic locations between southern Namibia and Durban, covering nearly the full extent of the species range. Sequence data were obtained from a 790bp region of the COI mtDNA gene (n=510) and a 182bp region of the nDNA SpREJ9 gene (n=145), respectively. The mtDNA data revealed 283 polymorphic sites (36%) defining 195 haplotypes, of which 160 were unique and 35 shared among individuals. Haplotype diversity (h) was found to be high both overall (h=0.95) and for individual localities (h=0.75-0.98), with nucleotide diversity (π) being low overall (π=0.013) as well as for individual localities (π=0.0033-0.0254). AMOVA revealed significant population structure among sampling sites in the Namaqua Province biogeographical region, as well as between three of the four respective coastal biogeographic provinces/regions. Gene flow was bi-directional among sampling sites in the south coast Agulhas and East Coast Province biogeographical regions, while gene flow in the Namaqua Province appears to be dominated by northwards movement. BAPS identified a significant break in the Cape Point region, which was also reflected in the gene flow patterns and parsimony networks. This broadly corresponds to previously identified biogeographic regions as well as genetic breaks for other marine species found along this coast. Fu's Fs statistics showed strong signal(s) of population expansion for individual sampling localities as well as for the data set as a whole, while MDIV estimated a time since expansion ranging from 7733-4759 years ago. The nDNA data revealed 54 variable sites (29.7%), defining 72 alleles of which 50 were unique and 22 shared among individuals. Many of the alleles (69.4%) were restricted to single sampling sites, with Betty's Bay on the south coast being the most diverse from a genetic viewpoint. Allelic diversity was high overall (h=0.86) while nucleotide diversity was low (π=0.025). No nuclear sub-group structure was identified by BAPS, although the parsimony network revealed shallow genetic structure between the Namaqua and Agulhas Provinces, with significant pairwise ФST values also recovered between their individual coastal localities. This points to at least one major barrier to gene flow for Parechinus angulosus along the South African coast, namely Cape Point. Several additional, smaller hindrances to gene flow along the coast were also identified, most of which are congruent with findings from studies on both other and sea urchin species. As a standalone study this research elucidated many aspects regarding the phylogeography of the Cape sea urchin, P. angulosus. However, it is when viewed in the broader context of invertebrate phylogeography along the southern African coastline that this research will provide its most critical insight.
AFRIKAANSE OPSOMMING: Geen opsomming
Wilson, Rebecca A. "Social Emotional Learning Guarantee? How Ohio Can Move Beyond Adopting Sel Standards." Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1615911161780767.
Full textKounkou, Guy Ludovic. "Caractères, rythmes de mise en place, âge et signification paléogéographique des faciès d'une séquence sédimentaire de deep-sea fan : exemple du deep sea fan de cayar (Plaine abyssale du cap vert)." Perpignan, 1993. http://www.theses.fr/1993PERP0002.
Full textGrider, John Taylor. ""And I can live without going to sea": Pacific maritime labor identity, 1840--1890." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219021.
Full textNahon, Alphonse. "Évolution morphologique actuelle d'une flèche littorale holocène : le Cap Ferret, à l'embouchure du Bassin d'Arcachon." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0182/document.
Full textLow rates of global sea level rise have allowed the Cap Ferret coastal barrier-spit to develop since about 3 000 years ago. Over the last 250 years, navigation charts attest of a significant instability of the distal end of the spit, to which the present study aims to provide a physical explanation. First, the crossing of cartographic data with meteoceanic data reveals a strong relationship of the spit-end behaviour with, on the one hand, the North Atlantic Oscillation (NAO), and, on the other hand, decadal to multidecadal variations in the rate of sea level rise in the Northeast Atlantic. Underlying processes were then investigated using a numerical model for sediment transport. Finally, the chronic erosion of the spit between 1986 and 2016, as well as the evolution mechanisms of the oceanic beach of the spit-end are described and quantified by means of topographic data. Locally, these results support the role of climate in the ongoing erosion of the spit-end. From a wider perspective, this study brings new insigths on the processes controling the evolution of Holocene barrier systems, in the present context of an accelerating sea level rise
Pettersson, Josefine, and Johanna Colling. "Analysis of Customisation in a Modular System : Development of a New Seat Solution." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44747.
Full textIchida, Masahiro. "Developmental history of a Late Paleozoic Panthalassan sea-mount cap limestone with reference to fusulinoidean taphonomy: an example from the Atetsu Limestone, Southwest Japan." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175130.
Full textTshuma, Mengezi Chancellor. "An investigation of skills, knowledge and farmer support programmes of land reform beneficiaries :a case study of Forest Hill farmers in Kenton-on-Sea in the Ndlambe Local Municipality." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1013109.
Full textBrady, Mark. "Managing agriculture and water quality : four essays on the control of large-scale nitrogen pollution /." Uppsala : Dept. of Economics, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a369-ab.html.
Full textCasperson, Molly. "Walrus, Seal, and Seabird Faunal Remains from Summit Island in Bristol Bay, Alaska: The Subsistence Practices of Norton Peoples in an Island Environment (2740–980 Cal B.P.)." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23116.
Full textBaisgård, Martin. "Multi-frequency backscattering from the sea floor; can the frequency response be used to identify typical sandeel grounds?" Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9782.
Full textIn this report a phenomenological characterization technique of received bottom echoes has been developed and studied, to evaluate the potential of locating typical sandeel grounds. Data from a calibrated multi--frequency echosounder collected during a Survey Methods for Abundance Estimation of Sandeel (Ammodytes marinus) Stocks (SMASSC) survey in the sandeel fishing grounds of "Vestbanken" and "Elbow Spit North", were processed with developed scripts in Matlab to extract first received bottom echo parameters. Together with Simrad SEABEC results and sandeel samples, possible distinctive parameters were found for what could be sandeel grounds. However, ambiguities caused by ping to ping fluctuations and complex behavior of the sandeel species make the characterization difficult. Many of the calculated echo parameters showed possible discrimination power for a future multi-variate analysis.
Le, Roux F. G. "The lithostratigraphy of Cenozoic deposits along the south-east Cape coast as related to sea-level changes." Thesis, Stellenbosch : Stellenbosch University, 1989. http://hdl.handle.net/10019.1/67134.
Full textAFRIKAANSE OPSOMMING: Senosoiese sedimente langs die suidooskus van die Kaapprovinsie is periodiek deur verskeie outeurs vir meer as 'n eeu bestudeer. In hierdie aanbieding word die Iiteratuur saamgevat en vele dubbelsinnige stratigrafiese onderverdelings en definisies opgeklaar. Die Senosoiese afsettings kan volgens oorsprong geklassifiseer word as marien, eolies en fluviaal. Die mariene afsettings, synde strand-, nabystrand-, estuarien of lagunale afsettings geassosieerd met transgressiewe/ regressiewe kusIyne, word nou op grond van kenmerkende litologiese, paleontologiese sowel as ouderdomsverskille onderverdeel in die Paleogeen Bathurst, Neogeen Alexandria en Kwaternere Salnova Foraasies. Die Laat-Plioseen tot Vroeg-Pleistoseen Nanaga Formasie, Middel- tot Laat- Pleistoseen Nahoon Formasie en die Holoseen Schel• Hoek Formasie vorm die kus-eoliese afsettings. AI die mariene en marienverwante (eoliese} formasies, gekenmerk deur kalkige klastiese afsettings, is saamgegroepeer in 'n nuutgedefinieerde Algoa Groep. Fluviale afsettings word onderverdeel in die Martindale, Kinkelbos, Bluewater Bay, Kudus Kloof en Sunland Formasies. Die onderskeie afsettings word gekorreleer met verskillende seevlakstande deur geologiese tye. Die vroegste Senosoiese transgressiewe/regressiewe siklus het in die Vroeg-Paleoseen begin en die hoogste aangetekende elevasie vir die era bereik. Die Bathurst Formasie is waarskynlik gedurende hierdie regressie afgeset. 'n Tweed~ kleiner transgressie/ regressiesiklus het plaasgevind gedurende die Laat-Eoseen tot Vroeg-Oligoseen. Sover tans bekend, kan geen afsetting in die dagsoomgebied van die Algoa Groep definitief met hierdie siklus in verband gebring word nie. Die volgende siklus, wat 'n transgressiewe maksimum van c. 250 m bereik het, het begin in die Middel-Mioseen en verstryk in die Vroee Plioseen. Mariene planasie van die kusplatform het gedurende die transgressie plaasgevind terwyl die Alexandria Formasie wat tans bo 120 m geleë is, gedurende die regressie afgeset is. Die Vroeg-Plioseen transgressie het waarskynlik 'n maksimum huidige hoogte van c. 120 m bereik, waartydens o.a. die 120 m branderstoep en "Humansdorpterras" gekerf is. Die Alexandria Formasie tans geleë tussen 60 en 120 m, is afgeset gedurende die Laat-Plioseen regressie. Hierdie regressie het verskeie relatief lang stilstande, wat waarskynlik die 106-m, 90- tot 100-m en 84-m branderstoepe verklaar, ondervind. Selfs die 60-m en 52-m kuslyne kon tydens hierdie regressie gevorm het. Voorlopige paleontologiese getuienis dui egter daarop dat die 60-m kuslyn 'n transgressiewe maksimum van 'n daaropvolgende siklus verteenwoordig, gevolg deur 'n regressie met minstens een beduidende stilstand by 52 m. Die Alexandria Formasie geleë tussen c. 60 en 30 m, is waarskynlik gedurende hierdie regressie gedeponeer, waartydens ook die Bluewater Bay, Kinkelbos en Kudus Kloof Formasies afgeset is. Gedurende die Kwaternêre transgressie/regressiesiklusse, waarvan minstens vier aangedui word, is die Salnova Formasie (afwesig bo 30 m) afgeset. Die Nahoon Formasie, wat ook op groot skaal op die kontinentale bank ontwikkel is, is gedeponeer gedurende die laaste twee Pleistoseen glasiale toe seevlakke tot benede -100 m gedaal het. Die Schelm Hoek Formasie wat tans nog afgeset word, het ontstaan uit die transgressiewe maksimum van die Flandriese transgressie aan die begin van die Holoseen.
ENGLISH ABSTRACT: Cenozoic sediments along the south-east coast of the Cape Province have been studied intermittently for more than a century by various authors. In this presentation the literature is reviewed and many ambiguous stratigraphic subdivisions and definitions are clarified. The Cenozoic deposits can be classified, according to origin, as marine, aeolian and fluvial. The marine deposits, being lagoonal deposits either beach, nearshore, estuarine or associated with transgressive/regressive shorelines, are now subdivided on the grounds of distinct lithological, palaeontological as well as age differences into the Palaeogene Bathurst, Neogene Alexandria and Quaternary Salnova Formations. The Late Pliocene to Early Pleistocene Nanaga Formation, the Hiddle to Late Pleistocene Nahoon Formation and the Holocene Schelm Hoek Formation constitute the coastal and marine-related aeolian deposits. All the marine (aeolian) formations, which are characterised by calcareous clastics, have been grouped together in a newly defined Algoa Group. Fluvial deposits are subdivided into the Martindale, Kinkelbos, Bluewater Bay, Kudus Kloof and Sunland Formations. The various deposits are correlated with different stands of sea-level through geological time. The earliest Cenozoic transgression/regression cycle started in the Early Palaeocene and reached the highest recorded altitude for the era. The Bathurst Formation was probably deposited during this regression. A second lesser transgression/regression cycle occurred in the Late Eocene to Early Oligocene. As far as is presently known, no deposit in the outcrop area of the Algoa Group can be definitely related to this cycle. The next cycle, which reached a transgressive maximum of c. 250 m, started in the Middle Miocene and terminated in the Early Pliocene. Marine planation of the coastal platform took place during the transgression, whilst the Alexandria Formation presently situated above 120 m, was deposited during the regression. The Early Pliocene transgression is considered to have reached a maximum present-day elevation of c. 120 m, during which the 120 m marine bench and "Humansdorp Terrace", amongst others, were carved. The Alexandria Formation presently situated between 60 and 120 m, was deposited during the Late Pliocene regression, which experienced several relatively long stillstands which probably account for the 106 m, 90 t.o 100 m and 8.4 m benches. Even the 60 m- and 52 m-shorelines could have been formed during this regression. Preliminary palaeontological evidence, however, suggests that the 60 m shoreline represents a transgressive maximum of a subsequent cycle followed by a regression with at least one significant stillstand at 52 m. The Alexandria Formation situated between c. 60 and 30 m, was probably deposited during this regression, which also saw the deposition of the Bluewater Bay, Kinkelbos and Kudus Kloof Formations. During the Quaternary transgression/regression cycles, of which at least four are indicated, the Salnova Formation (absent above 30 m) was deposited. The Nahoon Formation, which is also extensively developed on the continental shelf, was deposited during the last two Pleistocene glacials, when sea-levels receded to less than -100 m. The Schelm Hoek Formation, which is still being deposited, originated from the transgressive maximum of the Flandrian transgression at the start of the Holocene.
Brockhurst, Veronica. "Development of novel DNA-based methods for the measurement of length polymorphisms (microsatellites)." Thesis, Queensland University of Technology, 2001.
Find full textClaassens, Louw. "Aspects of the population ecology, habitat use and behaviour of the endangered Knysna seahorse (Hippocampus capensis Boulenger, 1900) in a residential marina estate, Knysna, South Africa: implications for conservation." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/54789.
Full textGrangier, Philippe. "Etude expérimentale de propriétés non-classique de la lumière; interférences à un seul photon." Phd thesis, Université Paris Sud - Paris XI, 1986. http://tel.archives-ouvertes.fr/tel-00009436.
Full textJewell, Oliver Joseph David. "Foraging ecology of white sharks Carcharodon carcharias at Dyer Island, South Africa." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/30926.
Full textDissertation (MSc)--University of Pretoria, 2012.
Zoology and Entomology
MSc
Unrestricted
Stewardson, Carolyn Louise, and carolyn stewardson@anu edu au. "Biology and conservation of the Cape (South African) fur seal Arctocephalus pusillus pusillus (Pinnipedia: Otariidae) from the Eastern Cape Coast of South Africa." The Australian National University. Faculty of Science, 2002. http://thesis.anu.edu.au./public/adt-ANU20030124.162757.
Full textMagaldi, Marcello Gatimu. "Turbulent Coherent Structures Near Coastal Capes." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/226.
Full textCornaz, Natacha. "An analysis of the #AidToo movement on Twitter: What impacts can a hashtag achieve on sexual exploitation and abuse in the aid sector?" Thesis, Malmö universitet, Fakulteten för kultur och samhälle (KS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-21819.
Full textTortorelli, Brian Alfred. "Turtle Cam: Live Multimedia Interaction For Engaging Potential Visitor Population To Canaveral National Seashore." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5534.
Full textID: 031001480; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Advisers: Cheryl Cabrera, Robb Lindgren, Robert Reedy.; Title from PDF title page (viewed July 16, 2013); Thesis (M.F.A.)--University of Central Florida, 2012.; Includes bibliographical references (p. 50-51).
M.F.A.
Masters
Visual Arts and Design
Arts and Humanities
Emerging Media; Digital Media
Ray, Kacy Lyn. "Factors affecting Wilson's Plover (Charadrius wilsonia) demography and habitat use at Onslow Beach, Marine Corps Base Camp Lejeune, North Carolina." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/30996.
Full textMaster of Science
Natarajan, Nallusamy. "Ligands build on macrocyclic platforms : can the macro cyclic unit influence the catalytic properties ?" Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF052.
Full textThis thesis describes the synthesis of a series of compounds built on conical resorcin[4]arene and calix[4]arene platforms: a) diphosphites derived from optically active binol, in which the phosphite moieties have been grafted to the wider rim of the generic cones. These ligands were assessed in asymmetric hydroformylation of vinyl arenes and led to high iso selectivity with good to excellent enantiomeric excess; b) N-heterocyclic carbenes bearing either one or two cavitand moieties and their use for the synthesis of [NiXCpL] complexes (X = Br or Cl, Cp = cyclopentadienyl, LH = NHC) in which the NiCp moiety has been supramolecularly trapped in a resorcinarene bowl. These complexes were found active in ethylene dimerization; c) bulky triazolium salts with one or two resorcinarene substituents that were found suitable for the synthesis of complexes with abnormal NHCs. The latter were tested in palladium-catalysed Suzuki-Miyaura cross-coupling of bulky aryl chlorides with sterically hindered aryl boronic acids. Better activities were observed with the sterically less hindered triazolium salt, which bears a single resorcinarene substituent. Its higher efficiency arises from a higher substrate accessibility in the resulting catalytic intermediates as well as the presence of flexible pentyl groups that may interact with the metal centre so as to facilitate the reductive elimination step
Gutierrez, Benjamin Thomas. "Relative sea-level rise and the development of channel-fill and shallow-water sequences on Cape Cod, Massachusetts." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/55058.
Full textIncludes bibliographical references (leaves 60-63).
Channel-fill sediments located in shallow-water off the south shore of Cape Cod, Massachusetts, provide a record of the late-Pleistocene and Holocene geological evolution in a post-glacial setting. Though conventionally difficult to sample adequately and anticipated to have low preservation potential, channel-fill sequences record in some detail differing relative sea-level and sedimentation processes. Two distinct channel-fill sequences record differing sequence stratigraphies, and hence different origins and post glacial histories. These sequences have accumulated in channels eroded into two different late-Pleistocene glacial units. The first fill-type was encountered in channels on the upper portions of the channel network in northern half of the study site. Channels in this portion of the channel system were incised into the late-Pleistocene glacial outwash substrate by spring sapping Uchupi and Oldale, 1994. The channel-fill sequences are comprised of a transgressive systems tract composed of a consistent sequence of coastal embayment and shoreline facies that have succeeded one another in response to Holocene relative sea-level rise. As relative sea-level flooded these paleo-channels, marsh environments were established in response to rising relative sea-level. With continued sea-level rise, the marsh environments migrated farther up channel. The exposed paleo-channels continued to flood, accommodating quiet water coastal embayments, likely protected from wave action by barrier beaches located more seaward. As relative sea-level rise continued, the coastline was driven landward over regions within the paleo-channels that formerly accommodated marsh and embayment sedimentation. The landward migration of the coastline was indicated by beach and barrier facies that covered the fine grained coastal embayment sediments. With further relative sea-level rise, beach and barrier settings were eroded as the shoreface migrated farther landward and nearshore marine deposition by wave and tidal flows ensued. Sedimentary environments similar to those recorded in the channels are found in modern coastal embayments on the south shore of Cape Cod. The second channel-fill type, which forms part of the southern and western portion of the channel network is more difficult to relate to the previously described sequence. The channels that contain fill were not adequately defined in this survey but were probably incised during the late-Pleistocene in response to ice melting and retreat. The sediments that make up this channel-fill are composed mainly of late-Pleistocene glaciolacustrine silts and clays. Sediments that make up the Holocene transgressive systems tract are limited to the upper meter of this channel sequence. They are composed of two sand units that reflect Holocene beach and nearshore sedimentation. The absence of coastal embayment and other paralic facies from the systems tract suggests that these channels did not accommodate protected embayments or that these sediments were not well preserved during the submergence of this region. Changes in the channel orientation or in the rate of relative sea-level rise may have contributed to this difference in sediment fill.
by Benjamin Thomas Gutierrez.
M.S.
Wendelberger, Kristie Susan. "Evaluating plant community response to sea level rise and anthropogenic drying: Can life stage and competitive ability be used as indicators in guiding conservation actions?" FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2558.
Full textMhlanga, Musa. "Magmatic-petrogenetic & structural relationships of the Peninsula Granite of the Cape Granite Suite (CGS) with the Malmesbury Group, Sea Point contact, Saldania Belt, South Africa." University of the Western Cape, 2020. http://hdl.handle.net/11394/8034.
Full textThe Sea Point contact, Cape Town, South Africa, exposes the contact between the Neoproterozoic Malmesbury Group metasedimentary rocks of the Pan-African Saldania belt and the intrusive S-type Peninsula Granite of the Neoproterozoic-Paleozoic Cape Granite Suite (CGS). The exposure outcrops over an area of approximately 170 m × 60 m with the northern end of the exposure being characterized by the country rock–microgranite intrusive contact. Heading further south, the outcrop transitions to the main contact zone, which is a predominantly gradational zone marked by sheets of compositionally variable granitic injections (collectively referred to as hybrid granite phases) concordant to the country rock structure, before reaching the main pluton area comprising the voluminous coarse-grained porphyritic granite. Using a combined study incorporating field, structural, geochemical, isotopic and U-Pb geochronological data, the intrusive contact is investigated to determine the construction history of the pluton and delineate possible emplacement mechanisms. The granitic phases, which vary from fine-grained leucocratic, medium-grained porphyritic to coarse-grained porphyritic, are peraluminous, magnesian to ferroan, and alkali-calcic. Based on the linear trends between the whole-rock major and trace element content of the granites vs. maficity (molar Fe + Mg), their initial Sr ratios and εNd(t) values, the granites of the study area are consistent with the currently proposed petrogenetic model for the CGS (e.g. Stevens et al., 2007; Villaros et al., 2009a; Harris & Vogeli, 2010); i.e., they are crustally derived and their chemical variability is controlled primarily by peritectic assemblage entrainment. The fractional crystallization of K-feldspar is identified as the primary mechanism for the local geochemical variability of the granites. The fractionation of K-feldspar as a mechanism of variability was evaluated using binary log-log diagrams of Ba, Sr and Eu and is interpreted to have taken place at levels close to the emplacement site after source entrainment processes. Although there is outcrop evidence, particularly in the main contact zone, to suggest that local assimilation and filter pressing took place, this was not reflected by the whole-rock and isotope geochemistry of the granites. This suggests that these processes are very localized and will need further rigorous testing to ascertain the extent to which they caused variability. Outcrop evidence for assimilation includes gradational country rock-granite contacts and the ductile behaviour of the country rock, whereas the occurrence of K-feldspar megacrysts embedded in the country rock at the main contact zone suggests melt accumulation and escape consistent with the filter pressing mechanism. In the case of the latter, the melt fraction of the granite was easily mobilized and driven out compared to the crystal fraction (K-feldspars) during the emplacement of the granites. Field relationships and the structural interpretation of the Malmesbury Group country rocks and the granites reveal that: (1) the various granites are late syn-tectonic and (2) were emplaced as incrementally assembled, repeated pulses of inclined granitic sheets more or less normal (i.e. at high angles) to the regional NE-SW shortening (D1) of the Malmesbury forearc during the Saldanian orogeny. Given the lack of a controlling shear zone in facilitating granite emplacement in the study area, the pre-existing planar anisotropies (bedding planes and foliations) in the country rock provided preferential pathways for magma emplacement and propagation during deformation. This implies that the tensile strength normal and parallel to the bedding and foliation anisotropy of the country rock was larger than the regional differential stress (σ1 – σ3, with σ1 ≥ σ2 ≥ σ3), allowing for magma emplacement relative to shortening. Sheet propagation is interpreted to have occurred through the balance of the following conditions: (1) density contrasts between host rocks and magmas, (2) the pressure differential along the subvertical fractures/sheets, and (3) the melt pressure equalling the lithostatic pressure to keep the magma pathways open and being sufficiently high such that it exceeds the sum of σ1 and the tensile strength of the rock parallel to σ1. The crystallization ages of the dated granite samples are identical within error and vary between 538.7 ± 3.6 Ma and 542.7 ± 2.9 Ma. They, therefore, cannot prove which granite phase intruded first and which one proceeded and so forth. Field relationships, however, suggests that the microgranites were first to intrude given their fine-grained nature and the localized chilled contacts they show with the country rock. The various coarser-grained and porphyritic phases were next to intrude, with their coarse grain-sizes and lack of chilled margins with the country rock suggesting that the time interval between their successive emplacements was not too long; this prevented the country rock from completely cooling down between each magma batch. Magma stoping and the ductile flow of the host material (owing to highly viscous magma flow) to accommodate granite emplacement are interpreted to be secondary emplacement processes.
Schäfer, Jean Stewart. "An investigation of how visual arts can be used to teach mathematical concepts of space and shape in Grade R." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1003514.
Full textSeger, Johanna. "Coagency of humans and artificial intelligence in sea rescue environments : A closer look at where artificial intelligence can help humans maintain and improve situational awareness in search and rescue operations." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157439.
Full textWARA-PS
Stechova, Katerina. "How to best 'sell' the 'best-seller' clause? : a review on whether the contract adjustment mechanism proposed by the EU draft Digital Single Market Directive can secure fair (additional) remuneration for authors and performers." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/42530.
Full textJonsson, Estrid, and Sara Fredrikson. "An Investigation of How Well Random Forest Regression Can Predict Demand : Is Random Forest Regression better at predicting the sell-through of close to date products at different discount levels than a basic linear model?" Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302025.
Full textAs the climate crisis continues to evolve many companies focus their development on becoming more sustainable. With greenhouse gases being highlighted as the main problem, food waste has obtained a great deal of attention after being named the third largest contributor to global emissions. One way retailers have attempted to improve is through offering close-to-date produce at discount, hence decreasing levels of food being thrown away. To minimize waste the level of discount must be optimized, and as the products can be seen as flawed the known price-to-demand relation of the products may be insufficient. The optimization process historically involves generalized linear regression models, however demand is a complex concept influenced by many factors. This report investigates whether a Machine Learning model, Random Forest Regression, is better at estimating the demand of close-to-date products at different discount levels than a basic linear regression model. The discussion also includes an analysis on whether discounts always increase the will to buy and whether this depends on product type. The results show that Random Forest to a greater extent considers the many factors influencing demand and is superior as a predictor in this case. Furthermore it was concluded that there is generally not a clear linear relation however this does depend on product type as certain categories showed some linearity.
Faasen, Petronella. "An Assessment of Accommodation Strategies for Coastal Adaptation in Cape Town, South Africa, in Response to Climate Change." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86665.
Full textENGLISH ABSTRACT: As the world finds itself increasingly unable to avoid the negative impacts of the physical phenomena associated with climate change, adaptation to climate change has been brought to the forefront of the international agenda. The range of adaptation technologies available can be categorized into three basic strategies (IPCC, 1990): Protection, (managed) Retreat, or Accommodation. The practice of adapting existing developments and infrastructure in the coastal zone by the process of accommodation has not yet seen wide implementation as a formalised adaptation strategy. In order for a community to accept and successfully implement accommodation strategies, all community stakeholders are required to accept and live with a certain level of managed risk, and to also rethink the concept of failure. As a result, accommodation practices implemented globally have been closely related to fields such as risk - and disaster management. Structural innovations in the field of accommodation measures include advanced technologies to elevate existing buildings safely above flood levels, and even “amphibious” houses. In Cape Town, South Africa, the choice between protection, retreat or accommodation as an adaptation measure remains complex. Not much discussion has yet been generated concerning accommodation measures that could be implemented to reduce the risk to existing properties that are already inappropriately located in the risk zone (e.g. seaward of the coastal hazard line), by accommodating the dynamic coastal processes taking place. Accommodation has been found to be most feasible in Cape Town at case study sites with a stable, non- or slowly eroding shoreline, which are also subject to flooding. The elevation of buildings and the alteration of buildings for flood-proofing, in unison with proactive risk and disaster management, could be implemented to accommodate the impacts of flooding on affected infrastructure. Located on Cape Town’s Atlantic Seaboard, Bakoven serves as a case study sample of such a site where an accommodation-based adaptation solution could be feasible. Both global and regional downscaled climate models have been found to deliver a large range of future climate conditions. Assuming best estimate future predictions, Bakoven properties have been found vulnerable to extreme flooding during both status quo and future extreme events. Environmental conditions at Bakoven are favourable for the construction of piled foundations. Stringent environmental and heritage constraints imposed by local government would, however, render accommodation strategies unviable. It is recommended that government at all levels be willing to adopt a more flexible approach to governing coastal areas, to ensure that the regulations they impose remain as dynamic as the environments which they govern. The viability and possible benefits of accommodation measures, rather than protection or retreat approaches should be carefully considered on an individual case-by-case basis, in unison with the local community.
AFRIKAANSE OPSOMMING: Wêreldwyd is gemeenskappe besig om toenemend te ervaar dat hul nie die nadelige gevolge van klimaatsverandering kan vryspring nie. Juis daarom, is aanpassing tot klimaatsverandering noodsaaklik. Die verskeidenheid van beskikbare benaderinge tot klimaatsverandering aanpassing kan in drie hoof kategorieë ingedeel word, volgens die IPCC (1990): Beskerming, (stelselmatige) Retireer of Akkomodasie. Die aanpassing van bestaande infrastruktuur d.m.v. akkomodasie is nog nie wyd geïmplementeer as ‘n amptelike aanpassings strategie nie. Ten einde die sukses van ‘n akkommodasie strategie te verseker, sal gemeenskappe genoodsaak wees om ‘n sekere vlak van residuele risiko te aanvaar en die konsep van die ‘faling’ te herdefinieer. Akkommodasie oplossings wêreldwyd is daarom nouliks verwant aan risiko- en rampsbestuur. Innovasies in die struktuurindustrie om die risiko van klimaatsverandering te akkommodeer, sluit onder andere in die fisiese oplig van geboue na ‘n hoër, veilige vlak, en ook die bou van sogenaamde “amfibiese” huise. In Kaapstad is die bepaling van die mees gepaste en voordelige aanpassings oplossing, net soos in die res van die wêreld, kompleks. Die moontlikheid van die gebruik van akkommodasie benaderinge en tegnologieë, eerder as beskermingsstrategieë, is nog nie welbekend of algemeen geïmplementeer nie. Daar bestaan wel ‘n geleentheid om hierdie tegnologieë toe te pas in die geval van bestaande strukture wat seewaarts van die dinamiese kusproses lyn, geleë is. Hierdie studie het bevind dat akkommodasie oplossings moontlik suksesvol kan wees by spesifieke gevallestudies langs Kaapstad se kuslyn waar die kuslyn grootendeels stabiel is. Die oplig en verandering van geboue om vloedbestand te wees, tesame met proaktiewe risiko- en rampsbestuur maatreëls, word by sommige van hierdie gevallestudies aanbeveel om die impak van klimaatsverandering te akkomodeer. Bakoven, ‘n klein gemeenskapsbuurt op Kaapstad se kuslyn, is ‘n voorbeeld van ‘n geval waar ‘n akkommodasie oplossing moontlik goed kan werk. Globale klimaatsmodelle lewer ‘n wye reeks van toekomstige klimaatsvoorspellings vir die jaar 2063. Tydens die toets van die mees waarskynlike toekomstige klimaats-scenario, is bevind dat Bakoven kwesbaar is vir die verwagte vloeding a.g.v. seevlakstyging verwag teen 2063. Daar is ook bevind dat selfs tydens huidige storms, sommige strukture aan Bakoven se kus kwesbaar is. Die omgewingstoestande by Bakoven word beskou as voordelig vir die konstruksie van heipale as fondasies om die geboue hoër op te lig. As gevolg van streng munisipale regulasies met omgewings- en geskiedkundige bewaring as doel, is hierdie opsie egter nie moontlik nie. Dit word aanbeveel dat die regulasies wat deur regeringsamptenare daargestel word, aanpasbaar genoeg moet wees om die veranderende kusomgewing in ag te neem. Die moontlikheid en volhoubaarheid van ‘n akkommodasie oplossing, eerder as ‘n beskermings- of opgee benaderinge, moet deeglik ondersoek word vir elke ‘n individuele geval, in samewerking met die betrokke gemeenskap.
Bouhier, Nicolas. "Etude de l'impact des icebergs Antarctiques sur l'Océan Austral." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0143/document.
Full textThe Antarctic polar ice cap constrains a freshwater flaux into the Austral Ocean through two equally important pathways : a localized and immediate injection through the melting of ice-shelves bases, and a delayed offshore injection through the calving and subsequent melt of icebergs. Some studies reckon that melting icebergs have the capacity to alter the hydrological and biogeo-chemical characteristics of the water column. The numerical models trying to evaluate this impact have shown contrasting results. Yet, they might suffer from a poor representation of the icebergs, namely due to our limited knowledge on both the spatial and size distributions of the icebergs, or even the processes involved in their mass loss. A new method using satellite altimetry measurements has lead to the creation of a database mapping Antarctic icebergs distribution with an unprecedented spatial and temporal coverage. Our joint analysis between these data and sea ice concentration fields highlights a possible transport of the freshwater injected by an iceberg and its impacts on sea ice.We also analyze the links between icebergs of different sizes : the large ones can be seen as ice buffers that diffuse across the whole ocean when breaking into small fragments of various sizes. We finally study the evolution of two giant icebergs, suggest the first parametrization of the fragmentation process and analyze the subsequent size distribution of the fragments. These results can be valuable to account in a more realistic way the fresh water flux constrained by icebergs in models
Bri, Molinero Diana. "ESTUDIO DEL EFECTO DE FACTORES EXTERNOS SOBRE LAS REDES WLAN Y DISEÑO DE UN ALGORITMO COGNITIVO ENERGÉTICAMENTE EFICIENTE." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/53450.
Full text[ES] Hoy en día existen muchos trabajos que analizan e intentan mejorar el rendimiento de las redes de área local inalámbricas desde diferentes perspectivas. Gran parte de estos trabajos se centran en aspectos de diseño, como son la distribución de frecuencias o la asignación de canales. Por lo tanto, como estos aspectos ya han sido ampliamente estudiados, los esfuerzos de esta tesis se han dirigido a estudiar otros factores que también podrían afectar a su rendimiento y que no han sido analizadas en profundidad todavía. El objetivo principal de esta tesis doctoral ha sido realizar un estudio detallado que analice el impacto de las condiciones meteorológicas sobre el rendimiento de las redes IEEE 802.11b/g. Para realizar este estudio, se han analizado dos escenarios reales con el fin de verificar los resultados y encontrar relaciones precisas. A partir de las conclusiones de estos análisis previos, el segundo objetivo ha sido diseñar un algoritmo cognitivo que, en base a las condiciones meteorológicas y a los parámetros de rendimiento de red, permita a las redes ajustar sus características de transmisión con el fin de superar tal impacto. Con el fin de llevar a cabo este estudio, primero fue necesario estudiar qué métodos estadísticos podían ser utilizados para extraer el nivel de correlación entre los parámetros de rendimiento de las redes y las condiciones meteorológicas del entorno. En segundo lugar, se tuvo que analizar qué parámetros de rendimiento de red se podían extraer de la red exterior de la UPV y seleccionarlos de acuerdo con el objetivo perseguido. A continuación, se definió el periodo de tiempo durante el cual se almacenarían los parámetros seleccionados de forma periódica. El siguiente paso fue seleccionar y almacenar las condiciones meteorológicas de una estación cercana durante el mismo periodo de tiempo. Finalmente, se realizó un preprocesado detallado con el fin de poner en orden todo el volumen de datos y se analizaron estadísticamente. Los resultados fueron exitosos, sin embargo aparecieron varios problemas por el hecho de estudiar una red real muy variable. Por lo tanto, se tuvo que desarrollar un escenario experimental con el fin de verificar los resultados. Para ello se diseñó y desarrolló un enlace exterior IEEE 802.11b/g punto a multipunto, y se analizó de nuevo el impacto de las condiciones meteorológicas. Se consideró un enlace multipunto para analizar también cómo influía el impacto del tiempo según la distancia y los diferentes esquemas de modulación. A partir de los resultados, se diseñó un algoritmo cognitivo energéticamente eficiente con el fin de reducir el impacto de los fenómenos meteorológicos en las redes IEEE 802.11b/g. Dicho algoritmo ha sido simulado y los resultados obtenidos han sido satisfactorios, tanto en términos de eficiencia energética como de rendimiento de la red. Para concluir, otro factor externo que se ha estudiado en esta tesis ha sido la tasa de absorción específica. Este parámetro está relacionado con una de las grandes preocupaciones actuales en cuanto a salud pública, ya que se utiliza para medir la exposición de los tejidos del cuerpo humano a los campos electromagnéticos. Obviamente, la absorción de señal por parte del cuerpo humano afecta a las redes y, por lo tanto, este parámetro se debería tener en cuenta a la hora de diseñar redes eficientes. Por esta razón se ha incluido en esta tesis doctoral.
[CAT] Actualment hi ha molts treballs que analitzen i intenten millorar el rendiment de les xarxes d'àrea local sense fils des de diferents perspectives. Gran part d'aquests treballs es focalitzen en aspectes de disseny, com són la distribució de freqüències o l'assignació de canals. Per tant, com aquests aspectes ja han sigut àmpliament estudiats, els esforços d'aquesta tesi doctoral s'han dirigit a estudiar altres factors que també podrien afectar al seu rendiment i que encara no han sigut analitzats amb profunditat. L'objectiu principal d'aquesta tesi doctoral ha sigut realitzar un estudi minuciós per analitzar l'impacte de les condicions meteorològiques sobre el rendiment de les xarxes IEEE 802.11b/g. Per a realitzar aquest estudi s'han analitzat dos escenaris reals per tal de verificar els resultats i trobar relacions precises. A partir de les conclusions d'aquests anàlisis previ, el següent objectiu ha sigut dissenyar un algoritme cognitiu que, en base a les condicions meteorològiques i als paràmetres de rendiment de la xarxa, permeti a les xarxes ajustar les seues característiques de transmissió per tal de superar tal impacte. Per tal de dur a terme aquest estudi, primer va ser necessari estudiar quins mètodes estadístics podien ser utilitzats per extraure el nivell de correlació entre els paràmetres de rendiment de les xarxes i les condicions meteorològiques de l'entorn. En segon lloc, es va haver d'analitzar quins paràmetres de rendiment es podien extraure de la xarxa exterior de la UPV i es van seleccionar d'acord a l'objectiu plantejat. A continuació, es va definir el període temporal al llarg del qual s'emmagatzemarien els paràmetres seleccionats de manera periòdica. El següent pas va ser seleccionar i emmagatzemar les condicions meteorològiques d'una estació propera durant el mateix període de temps. Finalment, es va realitzar un preprocessat per tal de posar en ordre tot el volum de dades i es van analitzar estadísticament. Els resultats van ser exitosos, però van aparèixer diversos problemes pel fet d'estudiar una xarxa real molt variable. Per tant, es va haver de desenvolupar un escenari experimental amb l'objectiu de verificar els resultats. Per aquesta raó es va dissenyar i implementar un enllaç exterior IEEE 802.11b/g punt a multipunt, i es va analitzar de nou l'impacte de les condicions meteorològiques. Es va considerar un enllaç multipunt per tal de d'analitzar també com influïa el impacte del temps segons la distància i els diferents esquemes de modulació. A partir d'aquests resultats, es va dissenyar un algoritme cognitiu energèticament eficient per tal de reduir l'impacte dels fenòmens meteorològics sobre les xarxes IEEE 802.11b/g. Aquest algoritme va ser simulat i els resultats obtinguts van ser satisfactoris, tant en termes d'eficiència energètica com de rendiment de la xarxa. va comprovar que la proposta aporta millores. Per concloure, un altre factor extern que s'ha estudiat en aquesta tesi doctoral ha sigut la taxa d'absorció específica. Aquest paràmetre està relacionat amb una de les preocupacions actuals pel que fa a la salut pública, ja que s'utilitza per a mesurar l'exposició dels teixits del cos humà als camps electromagnètics. Òbviament, aquesta absorció de la senyal afecta el rendiment de les xarxes i, per això, aquest paràmetre s'hauria de tenir en compte a l'hora d'implementar futures xarxes sense fils eficients. Per aquesta raó s'ha inclòs en aquesta tesi doctoral.
Bri Molinero, D. (2015). ESTUDIO DEL EFECTO DE FACTORES EXTERNOS SOBRE LAS REDES WLAN Y DISEÑO DE UN ALGORITMO COGNITIVO ENERGÉTICAMENTE EFICIENTE [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/53450
TESIS
Fanti, Laura. "La fonction des récipients céramiques dans les sociétés du Néolitique moyen B (4500-4000 cal BC) en Sardaigne centre-occidentale (Italie) : Indices fonctionnels, économiques, interculturels à partir de l’analyse des caractéristiques morphométriques, des résidus organiques et des traces d’usure des poteries." Thesis, Nice, 2015. http://www.theses.fr/2015NICE2024.
Full textThe isle of Sardinia (Italy) is a key zone in understanding the spread and the diffusion of the Neolithic in North Tyrrhenian region, due to its position in the middle of western Mediterranean Sea. Here, the rise and culmination of Neolithic economy is carried by San Ciriaco populations in the second half of V millennium cal BC. Recent archaeological excavations in central-western Sardinia revealed new contexts the study of which is fundamental in increasing our knowledge of these Neolithic societies.The aim of this work is to investigate the role of pottery in technical systems and symbolical behaviours of San Ciriaco societies in central-western Sardinia, in order to find evidence of strategies of use and explore their way(s) of life. The interdisciplinary approach in this study combines morphometrical analysis of vessels, use-wear observation and GC / GC-MS chemical analysis of organic residues absorbed in pottery.This research revealed a structuration of pottery assemblages into several functional categories which are differently represented in sites with a different function (settlements, burials, vessels “deposits”). The results contribute to highlight technical and symbolical behaviors linked to the use of pottery during its life cycle phases. These data offer a contribution to the issue of the evolution of pottery function during the Neolithic period in Western Mediterranean
La Sardegna, in virtù della sua posizione centrale nel Mediterraneo occidentale, rappresenta una zona cruciale per la comprensione del processo di propagazione del Neolitico e della sua evoluzione nell’area nord-tirrenica. Il pieno sviluppo dell’economia neolitica nell’isola è segnato dalla formazione e diffusione di un’entità culturale regionale originale, denominata “cultura di San Ciriaco”, durante la seconda metà del V millennio cal BC (Neolitico Medio B). Alcuni recenti scavi nella Sardegna centro-occidentale, scenario fondamentale nello sviluppo di tale entità culturale, hanno portato alla luce dei contesti inediti, il cui studio si rivela essenziale per la conoscenza di queste società neolitiche.L’obiettivo di questa ricerca è specificamente quello di indagare il ruolo dei recipienti ceramici nei sistemi tecnici e nei comportamenti simbolici dei gruppi umani San Ciriaco della Sardegna centro-occidentale, nell’intento di acquisire degli indizi sulle strategie di gestione delle risorse naturali e sulle modalità di sussistenza delle popolazioni durante il Neolitico medio B.L’approccio interdisciplinare seguito associa l’analisi morfometrica dei recipienti all’osservazione delle tracce d’uso e all’analisi chimica dei residui organici assorbiti nella matrice ceramica, mediante la tecnica della gascromatografia (GC) e della gascromatografia/spettrometria di massa (GC/MS).I risultati ottenuti rivelano una strutturazione delle collezioni ceramiche in molteplici gamme funzionali distinte e variabilmente rappresentate in siti con destinazione funzionale differente (abitato, sepolture, “depositi” di recipienti). L’analisi di tali contesti ha permesso di evidenziare alcuni specifici comportamenti tecnici e simbolici legati alla gestione dei recipienti durante tutto il loro ciclo d’utilizzo.L’interpretazione storica dei dati acquisiti con questa ricerca offre un contributo alla più vasta questione dell’evoluzione della funzione dei recipienti ceramici, nel corso del Neolitico, nell’area del Mediterraneo occidentale
Brilouet, Pierre-Etienne. "Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30192/document.
Full textDuring winter, local strong winds (Mistral or Tramontana) occurred in the Gulf of Lion which bring cold and dry continental air over a warmer sea. Those events, the cold air outbreaks, can lead to intense air-sea interactions which favour dense water formation and deep oceanic convection. The representation of air-sea exchanges is a fundamental aspect of of climate modelling and numerical weather forecasting. The ASICS-MED project aims to identify fine-scale processes leading to dense water formation and is a part of the "Intense air-sea exchanges" topic of the HyMeX program devoted to hydrological cycle in the Mediterranean. The processes occurring within the marine atmospheric boundary layer (MABL) and the oceanic mixing layer (ML) interact with one another at different spatial and temporal scales. Understanding the overall evolution of the MABL but also the local mechanisms requires taking into account all the processes. The study presented here is devoted to the mean and turbulent structure of the MABL under strong wind conditions. The objective is to determine how the organization of the turbulent field is impacted during CAO events and to estimate the surface fluxes associated with these strong wind conditions. The methodology adopted is based on the joint use of airborne observations collected during the HyMeX-SOP2 field campaign and numerical simulations. The HyMeX-SOP2 field campaign took place during the winter of 2013 in the Gulf of Lion. The research aircraft ATR42 was operated to document the mean and turbulent structure of the MABL during 11 CAO events. A spectral analysis based on an analytic model was carried out on 181 legs (i.e. stacked straight and level runs stabilized in altitude). The vertical profiles of the turbulent characteristic scales as well as the shape of the vertical velocity spectrum revealed an elongation of the energy structures in the mean wind direction associated with the organization of the turbulent field into longitudinal rolls. A unidirectional sampling of the three-dimensional turbulent field may lead to a limited representativeness of the coherent structures within the samples. However, knowledge of kinematic fluxes profiles over the entire thickness of the CLAM is necessary to estimate air-sea exchanges. A correction method was applied to turbulent fluxes calculated by eddy correlation in order to take into account systematic and random errors related to measurement and data processing. This correction made it possible to determine the best possible estimates of the extrapolated surface fluxes with a margin of uncertainty for the 11 CAO events documented during the HyMeX-SOP2 field campaign. The comparison of these airborne estimates with the other sources of information derived from bulk parameterizations show a systematic underestimation of the latent heat flux under strong wind conditions. A numerical approach allowed to complete the analysis of the mean and turbulent structure of the MABL during CAO events. The numerical study, based on the non-hydrostatic Meso-NH model, focuses on an episode of strong Tramontana with winds greater than 25m/s documented during the HyMeX-SOP2 field campaign. In a first step, a one-dimensional framework made it possible to understand the forcing terms necessary to reproduce in a realistic way the development of the observed MABL. This reference configuration allowed, in a second time, a Large-Eddy Simulation of the CAO event. This simulation has been validated using airborne data and has allowed to deepen the description of the turbulent field as well as the evolution of the coherent structures oriented in the axis of the mean wind
Díaz, Caballero Elena. "Efficient analysis and design of devices in Substrate Integrated Waveguide (SIW) technology." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34627.
Full textDíaz Caballero, E. (2013). Efficient analysis and design of devices in Substrate Integrated Waveguide (SIW) technology [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34627
TESIS
"Application of capillary pressures in determining the seal capacity of Eromanga Basin cap-rocks." Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09SM/09sms689.pdf.
Full textCamac, Bronwyn Anne. "An integrated geomechanical evaluation of cap and fault-seal for risking petroleum trap integrity using distinct element and boundary element numerical methods." Thesis, 2009. http://hdl.handle.net/2440/63712.
Full textThesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2009