Дисертації з теми "Stream characterisation"
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Stokes, Christopher Richard. "The geomorphology of palaeo-ice streams : identification, characterisation and implications for ice stream functioning." Thesis, University of Sheffield, 2001. http://etheses.whiterose.ac.uk/14815/.
Tedds, Sian. "Scale model testing of tidal stream turbines : wake characterisation in realistic flow conditions." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/18673/.
Joshi, Mahesh Raj. "The psychophysical characterisation of dorsal and ventral stream functions with equivalent noise paradigm normal clinical populations." Thesis, Glasgow Caledonian University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.726786.
Ali, Liaqat. "Gold and base metal exploration studies based on mineralogical and geochemical characterisation of stream sediments from north Pakistan." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3290.
Cryar, Benjamin Joseph. "Characterisation of the up-stream components in the stretch-induced ERK-1/2 MAP kinase cascade in human myometrial cells." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9581.
Hardy, Louis. "Caractérisation d'une lance diphasique et étude de l'impact d'un jet ascendant sur la stratification des fumées d'incendie." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0013.
This thesis is part of work that aims to study firefighters' equipment and the effect of their fire hose actions on their environment. This field of study is still new with a first essential step for the work presented in this manuscript carried out in 2016 with the performantial approach. In the first three chapters, we propose a comparative study between a new firefighting equipment, the twin-fluid hose, and the currently used hoses. Experiments have made it possible to determine the geometric characteristics and also the evolution of the size and speed of the drops making up the jet as a function of distance. The last two chapters complete this approach with an intermediate-scale study of the interaction phenomena between a spray and a smoke layer using a coupled experimental/modelling approach. The model tests will be used to verify the relevance of the numerical simulations of the Fire Dynamics Simulator software. The numerical approach makes it possible to quantify the heat exchange between the spray and the surrounding environment. One perspective of this work is the use of energy balances, which have been established, to seek to optimise the mode of action of firefighters
Dawood, Ali M. "Content based processing and modelling of MPEG-1 video streams." Thesis, University of Essex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298876.
Remans, Tony. "Characterisation, optimisation and application of banana streak virus (BSV) promoters /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17637.pdf.
Taylor, Hazel. "Characterisation of the primitive streak promoter of the murine Brachyury gene." Thesis, University of Warwick, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264913.
Boxall, Alistair Bruce Alleyne. "The characterisation and identification of major toxicants in streams receiving road runoff." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387635.
Pablo, Rodriguez Jose Luis. "Characterisation of the roel of Cassava brown streak virus (CBSV) encoded proteins during infection." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730898.
Geijskes, Robert Jason. "Characterisation of an Australian isolate of sugarcane bacilliform virus." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/16350/1/Robert_Geijskes_Thesis.pdf.
Geijskes, Robert Jason. "Characterisation of an Australian isolate of sugarcane bacilliform virus." Queensland University of Technology, 2003. http://eprints.qut.edu.au/16350/.
Kassier, Gunther Horst. "Ultrafast electron diffraction : source development, diffractometer design and pulse characterisation." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5359.
ENGLISH ABSTRACT: Ultrafast Electron Diffraction (UED) is a rapidly maturing field which allows investigation of the evolution of atomic arrangement in solids on timescales comparable to the vibrational period of their constituent atoms (~10-13 s). The technique is an amalgamation of conventional high energy electron diffraction methods and pump-probe spectroscopy with femtosecond (1 fs = 10-15 s) laser pulses. Ultrafast pulsed electron sources generally suffer from limitations on the attainable electron number per pulse (brightness) due to Coulomb repulsion among the electrons. In this dissertation, the design and construction of a compact UED source capable of delivering sub-300 fs electron pulses suitable for diffraction experiments and containing about 5000 electrons per shot is described. The setup has been characterised by measurement of the transverse beam size and angular spread, and through recording and analyzing an electron diffraction pattern from a titanium foil. Measurement of the temporal duration of fs electron pulses is not trivial, and a specialised compact streak camera operating in accumulation mode has been developed as part of this study. A sub-200 fs temporal resolution has been achieved, and the dependence of temporal duration on electron number per pulse was investigated for the current UED source. The observed trends correlate well with detailed electron bunch simulations. In order to investigate ultrafast processes on samples that cannot be probed repeatedly, it becomes necessary to significantly increase the brightness of current state of the art compact sources such as the one constructed in the present study. UED sources employing electron pulse compression techniques offer this possibility. Traditional pulse compression schemes based on RF cavities, while simple in principle, pose significant technical challenges in their realisation. The current thesis describes two novel UED pulse compression methods developed by the author: achromatic reflectron compression and pulsed cavity compression. Both concepts are expected to be easier to realise than conventional RF compression. Detailed simulations predict that such sources can attain a brightness improvement of more than one order of magnitude over compact sources that do not employ compression techniques. In addition, such sources show much promise for the attainment of pulse durations in the sub-100 fs range.
AFRIKAANSE OPSOMMING: Ultra vinnige elektron diffraksie is ‘n meettegniek wat tans in die proses is om vinnige ontwikkeling te ondergaan. Die tegniek het ten doel om strukturele omsettingsprosesse op ‘n lengteskaal van atoombindings en ‘n tydskaal van die vibrasie periode van atome in materie, ongeveer 10-13 s, te ondersoek. Dit word bewerkstellig deur die spasieresolusievermoë van gewone hoë energie elektron diffraksie met die tydresolusievermoë van femtosekonde (1 fs = 10-15 s) laserspektroskopie te kombineer. Die aantal elektrone per puls (intensiteit) van ultravinnige gepulsde elektronbronne word beperk deur die Coulomb afstootingskragte tussen die elektrone. Hierdie dissertasie beskryf die ontwerp en konstruksie van ‘n kompakte ultravinnige elektron bron. Die elektronpulse wat geproduseer word bevat tot 5000 elektrone per puls met ‘n tyd durasie van minder as 300 fs, en is geskik vir diffraksie eksperimente. Die aparaat is gekarakteriseer deur die volgende metings: elektronpulsdiameter, straaldivergensie, en ‘n titaan foelie se statiese diffraksie patroon. Dit is nie triviaal om die durasie van femtosekonde elektronpulse te meet nie, en n spesiale kompakte akkumulerende “streak camera” is vir die doeleindes van hierdie projek onwikkel. Die tydresolusie van hierdie “streak camera” is beter as 200 fs, en die afhanklikheid van die pulsdurasie wat deur die ultravinnige elektron bron geproduseer word as n funksie van die elektrongetal per puls is met behulp van hierdie toestel bepaal. Die resultate klop redelik goed met gedetaileerde simulasies van die elektron puls dinamika. Die karakterisasie van monsters wat nie herhaaldelik gemeet kan word nie vereis verkieslik ‘n nog hoër pulsintensiteit as wat met huidige bronne bereik kan word. ‘N verdere doelstelling is dus om ultravinnige elektron bronne te ontwikkel wat pulse met meer elektrone per puls kan genereer. Dit kan bewerkstellig word deur bronne wat van elektron puls kompressie tegnieke gebruik maak. Die tradisionele manier waarop dít gedoen word is deur middel van n kontinu gedrewe radio frekwensie holte. Hierdie metode gaan egter gepaard met aanmerklik hoë tegniese uitdagings. Om hierdie rede het die outeur twee alternatiewe puls kompressie konsepte ontwikkel: akromatiese reflektron kompressie and gepulsde holte kompressie. Albei konsepte sal waarskeinlik makliker wees om te realiseer as die tradisionele radio frekwensie kompressie, en is deur middel van gedetaileerde simulasies geverifiseer. Hierdie simulasies voorspel dat die intensiteit van genoemde bronne met ten minste n grooteorde meer kan wees as wat tans met kompakte ultravinnige elektron bronne moontlik is. Verder blyk dit dat sulke bronne n pulsdurasie van minder as 100 fs kan bereik.
Rolph, James. "Residual stress characterisation in forgings for aero-engine application." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-characterisation-in-forgings-for-aeroengine-application(f0963136-4919-48f9-91fe-34a752ff4666).html.
Kuleya, Chipo. "The synthesis, analysis and characterisation of piperazine based drugs." Thesis, Anglia Ruskin University, 2014. https://arro.anglia.ac.uk/id/eprint/579889/1/Thesis%20%20final%20-%20Chipo%20Kuleya%20July%202015.pdf.
Kuleya, Chipo. "The synthesis, analysis and characterisation of piperazine based drugs." Thesis, Anglia Ruskin University, 2014. http://arro.anglia.ac.uk/579889/.
Polatidis, Efthymios. "Residual stress and phase characterisation on zirconium oxides using synchrotron X-ray diffraction." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-phase-characterisation-on-zirconium-oxides-using-synchrotron-xray-diffraction(b0bc325a-2a94-4323-8739-7ea9b04727f3).html.
Janin, Yin Jin. "Characterisation of residual stress and investigation of environmental effects on atmospheric-induced stress corrosion cracking of austenitic stainless steel nuclear waste containers." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-residual-stress-and-investigation-of-environmental-effects-on-atmosphericinduced-stress-corrosion-cracking-of-austenitic-stainless-steel-nuclear-waste-containers(9b06d8fe-9395-4194-b276-73d698585e21).html.
Stone, Ben. "Royal palms: Exploring 1980s neoliberal characterisation through Foucauldian power and discourse." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132603/1/Benjamin_Stone_Thesis.pdf.
Offerhaus, Björn [Verfasser], Peter [Gutachter] Awakowicz, and Achim von [Gutachter] Keudell. "Characterisation of a novel twin surface dielectric barrier discharge designed for the purification of gas streams / Björn Offerhaus ; Gutachter: Peter Awakowicz, Achim von Keudell ; Fakultät für Elektrotechnik und Informationstechnik." Bochum : Ruhr-Universität Bochum, 2018. http://d-nb.info/116939731X/34.
Cardoso, João Carlos Canhoto. "Characterisation of Monodisperse Regimes of a Droplet Stream Generator." Master's thesis, 2021. http://hdl.handle.net/10400.6/11686.
O interesse em estudar fenómenos relacionados com as gotas tem vindo a aumentar nas últimas décadas. Na indústria de equipamentos de ejeção de fluidos, um grande problema é minimizar o diâmetro das gotas e ejetá-las de forma controlada utilizando um dispositivo de baixo custo. A geração de micro-gotas ganhou popularidade pelas suas múltiplas aplicações, como biotecnologia, engenharia de fabricação e ejeção de combustível. Tendo tudo isto em conta, um novo gerador de gotas contínuas, de baixo custo, foi projetado e fabricado. PLA foi o material usado para fabricar a estrutura do gerador de gotas dado que é um material de impressão 3D, o que permite minimizar o custo do dispositivo. Esta estrutura tem três componentes separados: tampa da célula piezoelétrica, câmara de fluido e suporte do pinhole. A fim de simplificar o mecanismo de perturbação, foi decidido que as ondas de perturbação devem ser aplicadas diretamente no fluido. Para conseguir isso, uma célula piezoelétrica foi colocada acima da câmara de fluido. O ”nozzle” utilizado é um pinhole óptico redondo de alta precisão, feito de de aço inoxidável e com três tamanhos diferentes: 100 µm, 150 µm e 200 µm. As propriedades do jato (diâmetro da gota, velocidade da gota e distância entre gotas) foram medidas de para diferentes propriedades (frequência da célula piezoelétrica, pressão de fluído e tamanho do ”nozzle”). O presente trabalho estudou as características do spray para três fluidos diferentes (àgua, jet fuel e mistura de biocombustível) e diferentes regimes monodispersos foram encontrados. Uma caracterização destes parametros é apresentada e discutida com detalhe. Verificou-se que o intervalo do diâmetro das gotas para um ”nozzle” com tamanho de 200 µm, que pode ser usado para todos os três fluidos, é de 401 µm até 472 µm e o intervalo de velocidade é de 1, 24 m/s até 2, 48 m/s, enquanto que para um ”nozzle” com um tamanho de 150 µm, a gama de diâmetros que pode ser obtido é de 287 µm até 340 µm e um intervalo de velocidade de 2, 04 m/s até 4, 38 m/s, para os três fluidos. Para um tamanho de pinhole de 100 µm, o intervalo de diâmetros das gotas para todos os três fluidos é de 206 µm a 258 µm e o intervalo de velocidade é 2, 36 m/s a 5, 99 m/s. Verificou-se que, tanto o diâmetro da gota como o espaçamento, diminuem com o aumento da fluxo da entrada e frequência, e a propriedade mais importante na formação do jato é o tamanho do ”nozzle”. A velocidade do jato é muito influenciada pela velocidade do fluxo e pelo tamanho do ”nozzle”. Quando comparados, os três fluidos comportam-se de uma forma diferente, resultando em diferentes diâmetro de gotas e velocidade do jato. Isto pode ser explicado pelas propriedades dos fluidos, onde a mistura de biocombustível apresenta maior viscosidade do que os outros dois fluídos.
Nienaber, Jesse Jay. "Phenotypic and biochemical characterisation of the causal agent of bacterial leaf streak of maize / Nienaber." Thesis, 2015. http://hdl.handle.net/10394/15480.
MSc (Environmental Sciences), North-West University, Potchefstroom Campus, 2015
Niemann, Nicolaas Johannes Jacobus. "Molecular characterisation of the causal agent of bacterial leaf streak of maize / Nicolaas Johannes Jacobus Niemann." Thesis, 2015. http://hdl.handle.net/10394/15478.
MSc Environmental Sciences, North-West University, Potchefstroom Campus, 2015