Дисертації з теми "ESS modelling"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-41 дисертацій для дослідження на тему "ESS modelling".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Tilgner, Hagen 1980. "Modelling splicing." Doctoral thesis, Universitat Pompeu Fabra, 2011. http://hdl.handle.net/10803/85056.
Повний текст джерелаSplicing of RNA molecules is the process, by which intervening sequences (“introns”) in the primary transcript are excised, and the remaining sequences (“exons”) are concatenated to form the mature RNA. Recent evidence shows that almost all spliced genes are affected by alternative splicing. Here, we define the minimal length of RNA oligomers that can sensibly be called splicing factor binding sites. Then, we explore the capacity of these oligomers to predict complete exon-intron structures. We highlight those oligomers that are most informative for this and show, that equal accuracy as in previous approaches can be achieved with less RNA oligomers. The observation, that this approach falls short of accurately predicting the entire exon-intron structure, led us to investigate determinants linked to co-transcriptional splicing. We show that nucleosomes are preferentially positioned on exons and hypothesize that they play a role in splicing decisions. We then introduce the “completed splicing index” and conclude that co-transcriptional splicing is very wide-spread in humans. Furthermore co-transcriptional splicing exhibits links to chromatin organization. In the light of these results, we go on to monitor chromatin changes on differentially included exons in pair-wise tissue comparisons. We find a variety of histone marks, but not all, showing significantly different behavior on up- and downregulated exons. The most prominently appearing marks are H3K9ac and two lysine 4 methylation states.
Phuthi, Thabisani Nigel. "Steelmaking with the ESS furnace : a model-based metallurgical analysis." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/75934.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2020.
Materials Science and Metallurgical Engineering
MEng
Unrestricted
Ferreira, Ana Rute Marques. "Modelling the carbon dioxide solubility with CPA EOS." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/3116.
Повний текст джерелаAs emissões de dióxido de carbono têm hoje uma grande importância na indústria de engenharia química, pelo que a sua captura e armazenamento são uma importante área de investigação. Os líquidos iónicos têm sido estudados como solventes (“green solvents”) para a separação de gases e captura de dióxido de carbono. Os líquidos iónicos são uma nova classe de solventes orgânicos, que devido aos seus catiões orgânicos assimétricos e aos aniões inorgânicos, não podem constituir uma estrutura cristalina, permanecendo assim no estado líquido à temperatura ambiente ou temperaturas próximas desta. Estes compostos apresentam uma vasta gama de propriedades interessantes, tais como a alta estabilidade térmica; o estado líquido numa grande amplitude térmica; a boa solvatação, tanto para compostos polares como não polares; e uma das mais interessantes, colocando-os como uma alternativa viável para substituir os solventes orgânicos voláteis, a sua pressão de vapor desprezável. Outra grande vantagem destes solventes "neotéricos" é a possibilidade de modelar as suas propriedades, através da infinita combinação de catiões e aniões, permitindo desenhar os líquidos iónicos de acordo com os objectivos específicos de uma operação particular melhorando o seu desempenho. Já foram aplicadas várias equações de estado para descrever a solubilidade do dióxido de carbono nos líquidos iónicos (equilíbrio líquidovapor), tais como a PC-SAFT, soft-SAFT, Peng-Robinson, Krichevsky- Kasarnovsky, entre outras equações de estado. Neste trabalho, dados experimentais para o equilíbrio líquido-vapor do sistema de dióxido de carbono + 1-alquil-3-metilimidazólio bis(trifluorometilsulfonil)imida foram modelados pela primeira vez com a equação do estado Cubic Plus Association (CPA EoS), em que os parâmetros da equação são obtidos através do ajuste de dados experimentais de pressão de vapor e densidade. Com o objectivo de estudar a solubilidade do dióxido de carbono noutros compostos, foram também medidos os equilíbrios líquidovapor dos sistemas dióxido de carbono + dissulfureto de carbono e dióxido de carbono + tetraclorometano, numa célula de alta pressão, e os dados experimentais obtidos foram igualmente modelados com a CPA EoS. A equação de estado CPA já demonstrou ser uma ferramenta termodinamicamente flexível tendo descrito correctamente o equilíbrio líquidovapor de misturas contendo componentes associativos e não associativos distribuídos por diferentes fases fluidas. Mostra-se que este modelo permite uma boa descrição dos dados experimentais disponíveis. ABSTRACT: Carbon dioxide emissions have today a great importance in the chemical engineering industry, so its capture and storage are an important field of research. Ionic liquids have been studied as green solvents in gases separation and for carbon dioxide capture. Ionic liquids are a new class of organic solvents that due to their asymmetric organic cations and organic or inorganic anions cannot form an ordered crystal and therefore remain liquid at or near room temperature. These compounds present a wide range of interesting properties, such as high thermal stability, large liquid temperature range, good solvation both for polar and non polar compounds, and one of the most interesting, putting them as a viable and ambient friendly alternative to replace the volatile organic solvents, is their negligible vapor pressure. Other major advantage of these “neoteric” solvents is the possibility of fine tune their properties through the endless combination of cations and anions. This designer characteristic allows one to build task-specific ionic liquids that have an enhanced performance for specific operations. Several equations of state have been applied to describe the carbon dioxide solubility in ionic liquids (vapor-liquid equilibrium) such PC-SAFT, soft- SAFT, Peng-Robinson EoS, Krichevsky–Kasarnovsky EoS, among others. In this work, the experimental vapour-liquid equilibrium data of the systems carbon dioxide + 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquids were modelled for the first time with the Cubic plus Association Equation of State (CPA EoS) with the EOS parameters fitted to vapor pressure and densities of the ionic liquids. In addition, it was used a high pressure cell to measure the vapour-liquid equilibrium of the binary systems carbon dioxide + carbon disulphide and carbon dioxide + carbon tetrachloride and the experimental data obtained were also modelled with the CPA EoS. The CPA EoS had already demonstrated to be a flexible thermodynamic tool for correctly modelling the phase equilibrium of mixtures containing both associative and non-associative components distributed by different fluid phases. It is shown that this model allows for a very good description of the experimental data available.
Oliveira, Vera Lúcia Henriques de. "Modelling the aqueous solubility of PAHs with CPA EoS." Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/3019.
Повний текст джерелаOs hidrocarbonetos aromáticos policíclicos (PAHs) constituem uma família de compostos caracterizada por possuírem dois ou mais anéis aromáticos condensados. São no geral referenciados de contaminantes ambientais porque estão associados à combustão incompleta de materiais orgânicos, como por exemplo, a queima de combustíveis fosseis, incineração de resíduos e derrames de petróleo. O estudo da solubilidade destes compostos em misturas aquosas é de grande importância, devido ao impacto que estes compostos têm na saúde pública e no meio ambiente, dado as suas propriedades cancerígenas. Neste trabalho, a capacidade da equação de estado CPA para modelar a solubilidade em meio aquoso de vários PAHs numa ampla gama de temperatura, foi avaliada. Esta equação de estado combina o termo Soave-Redlich-Kwong (SRK) para descrever as interações físicas com a contribuição de associação proposta por Wertheim, também usada em outras equações de estado, tais como as diferentes versões da SAFT. A CPA EoS já foi aplicada com sucesso a sistemas aquosos com alcanos, compostos aromáticos e álcoois. Os resultados obtidos são muito próximos dos valores encontrados na literatura, sugerindo que a CPA EoS é um modelo adequado para correlacionar soluções aquosas de moléculas complexas de poluentes orgânicos. ABSTRACT: The polycyclic aromatic hydrocarbons (PAHs) are a family of compounds characterized by having two or more aromatic rings condensed. They are referenced in general because they are environmental contaminants associated with the incomplete combustion of organic materials, such as the burning of fossil fuels and incineration of waste, and oil spills. The solubility of these xenobiotics in aqueous mixtures must be monitored due to their impact on public health and the environment, because of their carcinogenic properties and their ubiquity in the environment. In this work, the ability of the Cubic-plus-Association equation of state (CPA EoS) for modelling the aqueous solubility of several PAHs in a wide temperature range was evaluated. This equation of state combines the Soave-Redlich-Kwong (SRK) EoS for describing the physical interactions with the association contribution proposed by Wertheim, also used in other associating equations of state, such as the different versions of SAFT. The CPA EoS had already been successfully applied to aqueous systems with alkanes, aromatics and alcohols. The results obtained are in very close agreement with the literature data, suggesting that the CPA EoS is an adequate model for correlating aqueous solutions of complex molecules of organic pollutants.
Dghaym, Dana. "Extending the ERS approach for workflow modelling in Event-B." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/408104/.
Повний текст джерелаGigos, Pierre-Antoine. "Modelling a Solar Driven Absorption Heat Pump." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185684.
Повний текст джерелаMuniandy, Alageswary Vasanthi A. "Pedagogical modelling of an expository text pattern : theory and practice." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243663.
Повний текст джерелаTansey, Kevin James. "Monitoring and modelling surface moisture in north-east Jordan using ERS SAR data." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30384.
Повний текст джерелаBerg, Edvin, and Karl Wilhelm Lange. "Enhancing ESG-Risk Modelling - A study of the dependence structure of sustainable investing." Thesis, KTH, Matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266378.
Повний текст джерелаIntresset för hållbara investeringar har ökat avsevärt de senaste åren. Fondförvaltare och institutionella investerare är, från deras intressenter, manade att investera mer hållbart vilket minskar förvaltarnas investeringsuniversum. Denna uppsats har funnit att hållbara investeringar har en beroendestruktur som är skild från de regionala marknaderna i Europa och Nordamerika, men inte för Asien-Stillahavsregionen. De största värdeminskningarna i en hållbar portfölj har historiskt varit mindre än värdeminskningarna från en slumpmässig marknadsportfölj, framförallt i Europa och Nordamerika.
NOVARESIO, VALERIO. "Design and modelling an innovative SOEC stack." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2604774.
Повний текст джерелаJanus, Tomasz. "Modelling and simulation of membrane bioreactors for wastewater treatment." Thesis, De Montfort University, 2013. http://hdl.handle.net/2086/9507.
Повний текст джерелаLombard, James Edward. "Thermodynamic modelling of hydrocarbon-chains and light-weight supercritical solvents." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96844.
Повний текст джерелаENGLISH ABSTRACT: Long-chain hydrocarbons are of value to numerous lucrative industries. Due to the low volatility and close melting and boiling points of these solutes, traditional fractionation methods lack the required selectivity for separation and cause thermal degradation of the product. This project investigates the feasibility of Supercritical Fluid Extraction (SFE) for processing these systems, with the primary objective of modelling the high-pressure vapour-liquid equilibrium (VLE) properties of hydrocarbon solutes with a light-weight solvent using a semiempirical equation of state (EOS). Pure component vapour pressures and saturated liquid volumes are also investigated. A thorough investigation into the phase behaviour of the n-alkanes, 1-alcohols, carboxylic acids and esters in light weight supercritical solvents CO2, ethane and propane revealed that the solute structure and temperature largely influence the solute solubility and process feasibility. Good selectivity amongst the various solutes was observed for all three solvents, but very high pressures were required for complete miscibility using CO2 (exceeding 30 MPa). The quadrapole moment of CO2 further leads to complexities in phase behaviour such as temperature and density inversions (CO2/alkanes and CO2/alcohols) and 3-phase regions within the operating range. Simple linear trends in pressure vs. carbon number and temperature were observed for all the considered series using ethane and propane and these solvents were thus selected for conducting the modelling for this study. A thorough review of semi-emperical EOS models from literature revealed that the simple cubic equations of state (CEOSs) provide a promising modelling approach for SFE applications due to their simplicity, flexibility and reliability. The simple Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) EOSs provide good correlation of vapour pressure (%AAD below 5 %) for all the series over a large carbon number range (up to nC20), provided a two parameter alpha function is used. A 3rd parameter in the volume dependence for Patel-Teja (PT) EOS provides considerable improvement over the PR and SRK EOSs for satureate liquid volume correlations of the non-polar solutes (alkanes and esters), but offers virtually no advantage for the more polar alcohols and acids. The CEOSs therefore suffer clear limitations in simultaneous representation of these saturation properties (vapour pressure and liquid molar volume) for the systems of interest. Good correlations of high pressure binary VLE data were obtained using CEOSs available in the Aspen Plus ® simulator (% AAD in P, T and X2 generally below 1 % and ranging from 4 to 12 % for Y2 for all series) provided that two binary interaction parameters (BIPs) are used in the model mixing rules, irrespective of the model used. Aspen Plus ® was further validated as a reliable thermodynamic tool by comparing model fits using the RK-ASPEN model with parameters obtained from the Aspen Plus ® data regression routine and computational methods used in self-developed MATLAB software. Very similar results were obtained for both computational methods, which encourages the use of Aspen Plus ® for process modelling in SFE applications. A statistical sensitivity analysis into the relative effect and interactions between 6 modelling factors in applying the CEOSs revealed that the mixing rules, temperature and solute structure had the largest effect on the correlation of the high pressure VLE, with the pure component limit having negligible effect once BIPs are fitted to data. A significant interaction was, however, observed between the pure component model and the solute structure and temperature, which suggest that accurate correlation of mixture VLE does not solely rely on appropriate mixing rule selection, but also the pure model. Binary interaction parameters (BIPs) in model mixing rules were found to become intercorrelated when more than one are used, greatly impeding the development of generalized correlations. BIPs were also found to be sensitive to the pure component limit (alpha function and pure constants used), the temperature, the combining rules used and possibly the fluid density. These factors should all be taken into account systematically for developing generalized correlations which therefore fell outside the scope of this study. Recommendations were, however, made on how the MATLAB software developed in this study can be used to both expand the size of the statistical analysis already conducted into relevant modelling factors and to develop new generalized correlations for BIPs and new mixing rules.
AFRIKAANSE OPSOMMING: Lang-ketting koolwaterstowwe is van waarde in talle winsgewende industriële toepassings. Vanweë die lae vlugbaarheiden ooreenstemmende kook- en smeltpunte van hierdie molekules, toon tradisionele fraktioneringsmetodes nie die nodige selektiwiteit vir ekstraksie nie en veroorsaak bonop termiese degradering van die produk. Hierdie projek ondersoek dus die lewensvatbaarheid van superkritiese ekstraksie vir die prosesering van hierdie sisteme, met primêre fokus op die modellering van die hoë-druk damp-vloeistof ewewig eienskappe van koolwaterstowwe opgelos in ‘n lae-massa oplosmiddel met gebruik van ‘n semi-empiriese toestandsvergelyking. Suiwer-komponent dampdrukke en versadigde vloeistof volumes word ook ondersoek. ‘n Deeglike ondersoek na die fasegedrag van die n-alkane, 1-alkohole, korboksiel-sure asook esters in lae-massa superkritiese oplosmidds CO2, etaan en propaan toon dat die struktuur van die opgeloste stof en die temperatuur ‘n groot invloed het op die oplosbaarheid en proses lewensvatbaarheid. Goeie selektiwiteit tussen die verskillende koolwaterstowwe was waargeneem vir al drie oplosmiddels, alhoewel baie hoë drukke nodig was vir totale vermenging van die fases in CO2 (hoër as 30 MPa). Die quadrupool moment van CO2 veroorsaak verder ongewenste kompleksiteite in fase gedrag soos temperatuuren digtheid inversies (CO2/alkane en CO2/alkohole) en 3-fase-gebiede in die bedryfs-kondisies. Eenvoudige lineêre tendense in druk tenoor die koolstofnommer van die opgeloste stof asook die temperatuur was waargeneem vir al die ondersoekte koolwaterstof reekse in etaan en propaan en hierdie oplosmiddels was dus gekies vir die modellering vir hierdie studie. 'n Deeglike oorsig van semi-empiriese toestandsvergelykings uit die literatuur het getoon dat die eenvoudige kubiese toestandsvergelykings ‘n belowende modelleringsbenadering bied vir superkritiese ekstraksie toepassings vanweë hul eenvoudigeid, buigsaamheid enbetroubaarheid. Die eenvoudige Peng-Robinson (PR) en Soave-Redlich-Kwong (SRK) toestandsvergelykings bied goeie korrelasie van suiwer dampdruk (foute laer as 5 %) vir alle koolwaterstowwe oor ‘n groot koolstofnommer gebied (tot by nC20), met die voorwaarde dat ‘n 2 parameter alpha funksie gebruik word. ‘n 3rde parameter in die volume afhanklikheid van die Patel-Teja (PT) toestandsvergelyking bied ‘n beduidende verbetering in die passing van die versadigde vloeistof volume vir die nie-polêre koolwaterstowwe (n-alkane en die esters), maar bied geen voordeel vir die meer polêre alkohole en karkoksiel sure nie. Die kubiese modelle toon dus duidelike beperkings vir die gelyktydige voorstelling van hierdie versadigingde eienskappe (dampdruk en vloeistof volume) vir die sisteme van belang. Goeie korrelasie van hoë druk binêre damp-vloeistof ewewig data was verkry deur gebruik van die kubiese toestandsvergelykings beskikbaar inAspen Plus ® (fout in P, T en X2 tipies laer as 1 % en van 4 tot 12 % vir Y2 vir alle sisteme), met die voorwaarde dat 2 binêre interaksie parameters gebuik word in die model mengreëls, onafhanklik van die model. Aspen Plus ® was verder bekraktig as ‘n betroubare termodinamiese hulpmiddel deur model passings te vergelyk met die RK-ASPEN model tussen gevalle waar parameters verkry is deur die beskikbare regressie metode in Aspen Plus ® en metodes gebruik in self-ontwikkelde MATLAB sagteware. Eenderse resultate was verkry vir beide berekeningsmetodes, wat die gebruik van Aspen Plus ® vir prosesmodellering in superkritiese ekstrasie toepassings aanmoedig. ‘n Satistiese sensitiwiteits analise op die relatiewe effek en interaksies tussen 6 modelleringsfaktore in die toepassing van die kubiese toestandsvergelykings het gevind dat die mengreëls, temperatuur en die stuktuur van die opgeloste stof die grootste effek op die korrelasie van hoë druk binêre damp-vloeistof ewewig het, met ‘n weglaatbare effek vandie suiwerkomponent limiet waargeneem sodra binêre interaksie parameters gepas is aan data. ‘n Beduidende interaksie was wel waargeneem tussen die suiwerkomponent model en die struktuur van die opgeloste stof asook die temperatuur, wat daarop dui dat akurate korrelasie van mengsel damp-vloeistof ewewig nie slegs afhanklink is van ‘n gepaste keuse van mengreëls nie, maar ook die suiwer-komponent model. Binêre interaksie parameters in die model mengreëls ondergaan inter-korrelasie wanneer meer as een interaksie parameter gebruik word, wat die ontwikkeling van algemeen toepaslike korrelasies grotendeels belemmer. Binêre interaksie parameters was ook bevind om sensitief te wees tot die suiwer component limiet (alpha funksie en suiwer konstantes wat gebruik is), die temperatuur, die kombineringsreëls en moontlik die vloeistof digtheid. Hierdie faktore moet dus almal sistematies in ag geneem word wanneer algemeen toepaslike korrelasies ontwikkel word, wat dus buite die omvang van die huidge studie val. Aanbevelings was wel gemaak vir hoe die MATLAB sagteware ontwikkel vir hierdie studie gebruik kan word om beide die betaande statistiese analise uit te brei, asook nuwe korrelasies vir binêre interaksies parameters en nuwe mengreëls te ontwikkel.
Rasoul, Anwar Ali. "Modelling of vapour-liquid-liquid equilibria for multicomponent heterogeneous systems." Thesis, Teesside University, 2014. http://hdl.handle.net/10149/337883.
Повний текст джерелаMeyer, Marlies [Verfasser], and Peter H. [Akademischer Betreuer] Hauschildt. "A new EOS module for the atmosphere modelling code PHOENIX / Marlies Meyer ; Betreuer: Peter H. Hauschildt." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1137624914/34.
Повний текст джерелаEis, Christine [Verfasser], Angelika [Akademischer Betreuer] Humbert, Angelika [Gutachter] Humbert, and Eberhard [Gutachter] Bänsch. "Inverse Modelling at Recovery Glacier, Antarctica / Christine Eis ; Gutachter: Angelika Humbert, Eberhard Bänsch ; Betreuer: Angelika Humbert." Bremen : Staats- und Universitätsbibliothek Bremen, 2019. http://d-nb.info/119317712X/34.
Повний текст джерелаIvanenko, Yevhen. "Modelling and Simulation of Electrostatic Precipitators with a Dust Layer." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-44773.
Повний текст джерелаSabia, Roberto. "Sea surface salinity retrieval error budget within the esa soil moisture and ocean salinity mission." Doctoral thesis, Universitat Politècnica de Catalunya, 2008. http://hdl.handle.net/10803/30542.
Повний текст джерелаSatellite oceanography has become a consolidated integration of conventional in situ monitoring of the oceans. Accurate knowledge of the oceanographic processes and their interaction is crucial for the understanding of the climate system. In this framework, routinely-measured salinity fields will directly aid in characterizing the variations of the global ocean circulation. Salinity is used in predictive oceanographic models, but no capability exists to date to measure it directly and globally. The European Space Agency’s Soil Moisture and Ocean Salinity (SMOS) mission aims at filling this gap through the implementation of a satellite that has the potential to provide synoptically and routinely this information. A novel instrument, the Microwave Imaging Radiometer by Aperture Synthesis, has been developed to observe the sea surface salinity (SSS) over the oceans by capturing images of the emitted microwave radiation around the frequency of 1.4 GHz (L-band). SMOS will carry the first-ever, polar-orbiting, space-borne, 2-D interferometric radiometer and will be launched in early 2009. Like whatsoever remotely-sensed geophysical parameter estimation, the retrieval of salinity is an inverse problem that involves the minimization of a cost function. In order to ensure a reliable estimation of this variable, all the other parameters affecting the measured brightness temperature will have to be taken into account, filtered or quantified. The overall retrieved product will thus be salinity maps in a single satellite overpass over the Earth. The proposed accuracy requirement for the mission is specified as 0.1 ‰ after averaging in a 10-day and 2ºx2º spatio-temporal boxes. In this Ph.D. Thesis several studies have been performed towards the determination of an ocean salinity error budget within the SMOS mission. The motivations of the mission, the rationale of the measurements and the basic concepts of microwave radiometry have been described along with the salinity retrieval main features. The salinity retrieval issues whose influence is critical in the inversion procedure are: • Scene-dependent bias in the simulated measurements, • Radiometric sensitivity (thermal noise) and radiometric accuracy, • L-band forward modeling definition, • Auxiliary data, sea surface temperature (SST) and wind speed, uncertainties, • Constraints in the cost function, especially on salinity term, and • Adequate spatio-temporal averaging. A straightforward concept stems from the statement of the salinity retrieval problem: different tuning and setting of the minimization algorithm lead to different results, and complete awareness of that should be assumed. Based on this consideration, the error budget determination has been progressively approached by evaluating the extent of the impact of different variables and parameterizations in terms of salinity error. The impact of several multi-sources auxiliary data on the final SSS error has been addressed. This gives a first feeling of the quantitative error that should be expected in real upcoming measurements, whilst, in another study, the potential use of reflectometry-derived signals to correct for sea state uncertainty in the SMOS context has been investigated. The core of the work concerned the overall SSS Error Budget. The error sources are consistently binned and the corresponding effects in terms of the averaged SSS error have been addressed in different algorithm configurations. Furthermore, the results of a salinity horizontal variability study, performed by using input data at increasingly variable spatial resolution, are shown. This should assess the capability of retrieved SSS to reproduce mesoscale oceanographic features. Main results and insights deriving from these studies will contribute to the definition of the salinity retrieval algorithm baseline.
Poudel, Sabin. "Modelling of a Generic Aircraft Environmental Control System in Modelica." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156675.
Повний текст джерелаGuevara, Rukoz Adriana. "Decoding perceptual vowel epenthesis : experiments & modelling." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE069.
Повний текст джерелаWhy do people of different linguistic background sometimes perceive the same acoustic signal differently? For instance, when hearing nonnative speech that does not conform to sound structures allowed in their native language, listeners may report hearing vowels that are not acoustically present. This phenomenon, known as perceptual vowel epenthesis, has been attested in various languages such as Japanese, Brazilian Portuguese, Korean, and English. The quality of the epenthesized vowel varies between languages, but also within languages, given certain phonemic environments. How much of this process is guided by information directly accessible in the acoustic signal? What is the contribution of the native phonology? How are these two elements combined when computing the native percept? Two main families of theories have been proposed as explanations: two-step and one-step theories. The former advocate an initial parsing of the phonetic categories, followed by repairs by an abstract grammar (e.g., epenthesis), while one-step proposals posit that all acoustic, phonetic, and phonological factors are integrated simultaneously in a probabilistic manner, in order to find the optimal percept. In this dissertation, we use a combination of experimental and modelling approaches in order to evaluate whether perceptual vowel epenthesis is a two-step or one-step process. In particular, we investigate this by assessing the role of acoustic details in modulations of epenthetic vowel quality. In a first part, results from two behavioural experiments show that these modulations are influenced by acoustic cues as well as phonology; however, the former explain most of the variation in epenthetic vowel responses. Additionally, we present a one-step exemplar-based model of perception that is able to reproduce coarticulation effects observed in human data. These results constitute evidence for one-step models of nonnative speech perception. In a second part, we present an implementation of the one-step proposal in Wilson et al. (2013) using HMM-GMM (hidden Markov models with Gaussian mixture models) from the field of automatic speech recognition. These models present two separate components, determining the acoustic and phonotactic matches between speech and possible transcriptions. We can thus tweak them independently in order to evaluate the relative influence of acoustic/phonetic and phonological factors in perceptual vowel epenthesis. We propose a novel way to simulate with these models the forced choice paradigm used to probe vowel epenthesis in human participants, using constrained language models during the speech decoding process. In a first set of studies, we use this method to test whether various ASR systems with textit{n}-gram phonotactics as their language model better approximate human results than an ASR system with a null (i.e., no phonotactics) language model. Surprisingly, we find that this null model was the best predictor of human performance.In a second set of studies, we evaluate whether effects traditionally attributed to phonology may be predictable solely from acoustic match. We find that, while promising, our models are only able to partially reproduce some effects observed in results from human experiments. Before attributing the source of these effects to phonology, it is necessary to test ASR systems with more performant acoustic models. We discuss future avenues for using enhanced models, and highlight the advantages of using a hybrid approach with behavioural experiments and computational modelling in order to elucidate the mechanisms underlying nonnative speech perception
MANSOURKIAEI, MOHSEN. "An experimental and modelling approach to study the performance and degradation of low temperature electrolyzers." Doctoral thesis, Politecnico di Torino, 2023. https://hdl.handle.net/11583/2975709.
Повний текст джерелаHuynh, Ngoc Huu. "The Inhibition Of Copper Corrosion In Aqueous Environments With Heterocyclic Compounds." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15951/1/Ngoc_Huu_Huynh_Thesis.pdf.
Повний текст джерелаHuynh, Ngoc Huu. "The Inhibition Of Copper Corrosion In Aqueous Environments With Heterocyclic Compounds." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15951/.
Повний текст джерелаKruger, Francois Johan. "FTIR measurement of monomer fractions in dilute alcohol-acetone systems for the evaluation of the sPC-SAFT EoS." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85868.
Повний текст джерелаENGLISH ABSTRACT: The simplified Perturbed-Chain Statistical Associating Fluid Theory (sPC-SAFT) is characterised by the dual advantages of decreased computational intensity, while remaining accurate for a variety of systems. Vapour-liquid equilibrium data are used to generate equation of state parameters. However, incorporating monomer fraction data into the parameter regression has long been advocated as a good, or even preferred, practice. Therefore, the monomer fraction data of dilute alcohol-acetone systems were analysed in this study. A small stainless steel sample vessel was constructed with temperature control, manual pressure control and a mechanism for liquid phase analysis via infrared spectroscopy. The performance of the spectrometer was verified by comparison with the ethanol – n-hexane data of von Solms et al. (2007), after which new monomer fraction data were obtained for dilute solutions (between 0.01 and 1.5 mol%) of methanol, ethanol, 1-propanol and 2-propanol in acetone near 23 °C. For dilute alcohol-acetone systems it was found that the propanols had the highest monomer fractions, and methanol the lowest. With increasing alcohol concentration, the monomer fractions decreased exponentially to values of 0.4 and 0.1 for methanol and the other alcohols respectively. The excess availability of hydrogen bond acceptors in the mixtures explains the equivalency observed for ethanol, 1-propanol and 2-propanol. For dilute acetone-alcohol systems it was found that, especially for methanol and ethanol, there was a pronounced trend towards acetone monomer fractions of 1 at infinite dilution. For the acetone – 2-propanol system, a previously unrecorded monomer peak was observed and quantified. Acetone monomer fractions tended to decrease as alcohol chain-length increased, showing that acetone could more easily penetrate the hydrogen bond network of the solvent when the solvent-solvent bonds were weaker. Monomer fraction data were compared to predictions for the sPC-SAFT scheme and parameters combinations published in the literature. The experimental data were accurately modelled using modified association parameters such that the solute associates strongly (εAB≈103 κ≈1), while the solvent parameters were decreased (εAB≈102 κ≈10˗3) to give a weakened solvent association effect. The difficulty for the dilute solute in penetrating the solvent bonding network appeared to be similar to the hydrophobic effect. Two new association schemes were proposed for acetone, assigning a single (N) or two (2N) negative association sites to represent the oxygen valence electron pairs. These schemes showed relative success in modelling acetone as the solvent in the mixture, while not being able to predict acetone monomer fractions when acetone was the solute. For dilute acetone-alcohol systems, the data were best described using the 2B model for acetone, while the best choice of scheme for the alcohol varied from system to system. For dilute alcohol-acetone mixtures it was generally found that a 2B-N model (with modified association parameters) provided the best fit to those experimental data. Accurate modelling below 0.1 mol% was difficult to attain with average errors decreasing to the order of 10% when this area was excluded. In this highly dilute region, not one of the models could describe the rapid change in (monomer fraction) gradient sufficiently while simultaneously offering accurate predictions over the entire experimental range.
AFRIKAANSE OPSOMMING: Die sPC-SAFT of simplified Perturbed-Chain Statistical Associating Fluid Theory toestandsvergelykings word wyd gebruik as gevolg van sy goeie akkuraatheid vir ‘n wye reeks sisteme, ten spyte van verminderde berekeningsintensiteit. Die parameters vir dié toestandsvergelyk word afgelei van faseewewig data, maar monomeer fraksie data word voorgestel vir die verbetering van (veral) die assosiasie parameters. Ten opsigte hiervan, was alkohol-asetoon sisteme bestudeer en hul monomeer fraksies gemeet. ‘n Staal reaktor was ontwerp (met ‘n temperatuurbeheerstelsel sowel as drukbeheer) om vloeistof monsters voor te berei vir analise d.m.v. infrarooi-spektroskopie. Die akkuraatheid van die eksperimentele apparaat is bewys deur nabootsing van etanol – n-heksaan data van von Solms et al. (2007), waarna nuwe monomeer fraksie data gegenereer is vir verdunde mengsels (0.01 tot 1.5 mol%) van metanol, etanol, 1- en 2-propanol met asetoon by 23 °C. Metanol monomeer fraksies het eksponensieël afgeneem na 0.4, terwyl etanol en propanol fraksies afgeneem het na ‘n gemene waarde van ongeveer 0.1. Hierdie tendens word toegeskryf aan ‘n oormaat van toeganklike waterstofbindingontvangers in hierdie mengsels. Vir verdunde asetoon-alkohol sisteme is daar ‘n tendens, (veral vir verdunnings met metanol en etanol) vir die monomer fraksies om te neig na 1 by oneindige verdunning. ‘n Monomeer piek is ook waargeneem vir die asetoon – 2-propanol sisteem. Hierdie piek is nie voorheen gesien in ander studies nie en dit is ook die eerste keer wat sulke data gekwantifiseer is. Daar is bevind dat asetoon monomeer fraksies afneem soos alkohol kettinglengte toeneem. Die gegenereerde monomeer fraksie data word vergelyk met verskeie sPC-SAFT parameterstelle vanuit die literatuur. Oor die algemeen, is die beraamde fraksie veel hoër as die eksperimentele data wanneer die 2B/3B/2C skemas met ‘n nie-assosiërende asetoon molekuul gemodelleer word. Wanneer die 2B parameters van von Solms et al. (2004) gebruik word, toon die beraming ‘n drastiese onderskatting van die data. Om ‘n akkurate beraming van die monomeer fraksie data te kry, moet die assosiasie parameters van die opgeloste stof vermeerder word (met εAB≈103 κ≈1) terwyl die oplosmiddel s’n drasties verswak moet word (met εAB≈102 κ≈10-3). Hierdie patroon kan vergelyk word met die hidrofobiese effek waar die kragte binne die oplosmiddel ‘n netwerk vorm wat die opgeloste stof uitstoot. Twee nuwe assosiasie skemas word ook voorgestel vir asetoon waar onderskeidelik een (N) en twee (2N) negatiewe sones, wat die valenselektroonpare op die suurstofatoom voorstel, aan asetoon geheg word. Hierdie twee skemas het relatiewe sukses getoon in die modellering van verdunde alkohol-asetoon sisteme terwyl dit ‘n swak beskrywing van die verdunde asetoon-alkohol mengsels voorspel het. ‘n Gewysigde 2B asetoon skema gee ‘n goeie beskrywing van die eksperimentele data. In hierdie geval, is die keuse van alkohol skema minder belangrik, terwyl die waardes van die assosiasie parameters verminder moet word. Vir verdunde alkohol-asetoon mengels word daar bevind dat ‘n 2B-N model met nuwe assosiasie parameters die beste passing van die eksperimentele data gee. Daar was ook bevind dat die modelle se akkuraatheid drasties afneem (met fout vermeerdering in die orde van 10%) wanneer die konsentrasie van die opgeloste stof minder as 0.1 mol% is.
Fawzy, Mohamed Khaled Adel. "An experimental and modelling study of the capture of CO2 from gas mixtures with different techniques, with focus on multicomponent effects." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Знайти повний текст джерелаMauritz, Jakob Martin Andreas. "Homeostasis and volume regulation in the Plasmodium falciparum infected red blood cell." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/240497.
Повний текст джерелаRobles, Martínez Ángel. "Modelling, simulation and control of the filtration process in a submerged anaerobic membrane bioreactor treating urban wastewater." Doctoral thesis, Editorial Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34102.
Повний текст джерелаRobles Martínez, Á. (2013). Modelling, simulation and control of the filtration process in a submerged anaerobic membrane bioreactor treating urban wastewater [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34102
Alfresco
Premiado
Souza, Bruno Cortes de. "Estudo de um sistema integrado de bombeio centrífugo submerso." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/4678.
Повний текст джерелаApproved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-26T13:11:08Z (GMT) No. of bitstreams: 1 brunocortesdesouza.pdf: 4659510 bytes, checksum: 73ac58d8200d2432ce64c9ebbd6d8c94 (MD5)
Made available in DSpace on 2017-05-26T13:11:08Z (GMT). No. of bitstreams: 1 brunocortesdesouza.pdf: 4659510 bytes, checksum: 73ac58d8200d2432ce64c9ebbd6d8c94 (MD5) Previous issue date: 2017-02-20
Esse trabalho apresenta estudos, modelagem e análises de um sistema de bombeio centrífugo submerso (BCS), considerando as características dos principais componentes presentes neste sistema. As contribuições do trabalho estão na partida do BCS, como no desenvolvimento de soluções para mitigar alguns dos problemas observados, como por exemplo, os relacionados à qualidade de energia elétrica nos terminais do BCS. A modelagem de cada equipamento elétrico que compõe o BCS é apresentada no trabalho, destacando-se alguns dos aspectos operacionais relevantes que são considerados na operação. Foi feito um projeto para dimensionamento dos filtros passivos utilizados na atenuação das componentes harmônicas das tensões e correntes produzidas pelo sistema, além de auxiliar na regulação da tensão no ponto em que o BCS está conectado. Nas simulações realizadas, considerou-se um sistema de média tensão com um motor de indução trifásico em gaiola de esquilo de 3835HP que acoplado a uma bomba centrífuga possui um alto coeficiente de inércia. Com a inserção de modelos de atritos rotacionais para o torque do conjunto motor-bomba, pôde-se representar os efeitos que acontecem nos instantes iniciais da partida do sistema e avaliar o desempenho da estratégia de controle utilizada para o acionamento. Assim como ocorre nos sistemas reais que são alimentados por cabos submarinos de longo comprimento, utilizou-se um sistema de controle do sistema em malha aberta com uma metodologia para estimar e compensar a queda de tensão que ocorre entre os terminais do conversor e o terminal de entrada do motor elétrico. O trabalho apresenta ainda uma breve comparação entre o conversor fonte de tensão (VSC) de 2 níveis e o conversor de 3 níveis com neutro grampeado (NPC). Por fim, é analisada a situação onde a alimentação do BCS é desequilibrada devido à diferença de valores entre os parâmetros do cabo submarino.
This work shows studies, modelling and analyses of an electrical submersible pump system (ESP), considering the characteristics of key elements in this system. The contributions are in its start-up, as also in the development of solutions for mitigation of some observed problems, e.g., those related to power quality at the equipment terminals. The model for each electrical equipment inside the ESP is presented in this work and highlighted some of the pertinent operational aspects that is commonly considered on practical operation. A project is settled for sizing the passive filters to attenuate the harmonic components of the voltages and currents supplied by the grid, in addition to helping voltage regulation at ESP connection point. In the study cases, it was considered a medium voltage power system with a 3835HP three phase squirrel cage induction motor which is connected with a centrifugal pump that results in a high inertia coefficient. Rotational friction model is considered in the studies to characterize the effects that occur at the initial seconds of the start-up of the system and also to evaluate the performance of the implemented control strategy. In the same way that occurs in real systems that are supplied by downhole electric cables, it was considered an open-loop V/f control with a methodology to estimate and compensate the voltage drop that exists between the terminals of the converter and the motor input. This work also establishes a short comparison between a 2-level voltage source converter (VSC) and a 3-level neutral-point clamped (NPC) VSC. Finally, the system is analyzed through the occurrence of an unbalance of downhole electric cable parameters.
Secco, Michele. "Characterization studies on cement conglomerates from historic reinforced concrete structures." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422111.
Повний текст джерелаBrevettato da Joseph Monier nel 1867, il conglomerato cementizio armato (comunemente definito calcestruzzo armato, o cemento armato) è diventato un materiale da costruzione di grandissimo successo nel corso del XX secolo, capace di soddisfare le richieste più impegnative di progettisti e ingegneri. Tuttavia, nonostante la sua introduzione e diffusione abbia spianato la strada a un secolo di continue innovazioni tecnologiche nell'ambito dell'industria delle costruzioni, il comportamento meccanico degli edifici costruiti con tale materiale non è stato compreso a pieno per lungo tempo, con conseguente incidenza di una serie di problemi strutturali interessanti gli edifici costruiti nei primi decenni del XX secolo. Alle radici del problema non vi era soltanto la concezione empirica dei calcoli strutturali, ma anche la mancanza di una tecnologia standardizzata di produzione del calcestruzzo e la scarsa attenzione posta nella scelta delle materie prime e delle strategie di miscelazione. Inoltre, le problematiche relative alla resistenza del conglomerato cementizio armato all'azione degradante di agenti chimico-fisici esterni non sono state considerate per gran parte del XX secolo, a causa dell'errata assunzione di "durabilità infinita" del materiale. Un secolo e mezzo dopo la sua invenzione, il cemento armato è al giorno d'oggi considerato un materiale di interesse culturale, costituendo il nucleo strutturale dell'architettura contemporanea. La caratterizzazione di questo materiale eterogeneo è stata per decenni di competenza esclusiva degli ingegneri strutturali, ma, nel corso degli ultimi quindici anni, è diventata una delle principali tematiche di studio degli scienziati dei materiali, a causa della complessità mineralogica, tessiturale e chimica del calcestruzzo e della sua suscettibilità all'azione di agenti alterativi esterni di natura chimico-fisica. Considerata la complessità del materiale, un approccio analitico combinato e multidisciplinare, comprendente campi sia ingegneristici sia della scienza dei materiali, risulta necessario al fine di ottenere una completa caratterizzazione meccanica e microstrutturale delle strutture in cemento armato e, conseguentemente, di progettare ed eseguire interventi di restauro con materiali adeguati per la riabilitazione e il miglioramento strutturale di questi moderni beni culturali. Tale progetto di ricerca è stato volto alla caratterizzazione multi-analitica di conglomerati cementizi appartenenti a cinque edifici storici in cemento armato, tutti localizzati nell’Italia nordorientale e costruiti tra la fine del XIX secolo e la metà del XX secolo, prestando particolare attenzione alla determinazione dei mix design originari, allo studio del loro stato di conservazione e allo sviluppo di tecniche analitiche innovative di natura mediamente distruttiva. I materiali sono stati anzitutto caratterizzati tramite un approccio multi-analitico; in questa parte dello studio, la classica caratterizzazione petrografica dei conglomerati secondo le linee guida dello standard americano ASTM C856 è stata integrata con i risultati ottenuti tramite analisi mineralogiche in diffrazione ai raggi X delle polveri (XRPD) e analisi microstrutturali e microchimiche in microscopia elettronica a scansione e microfluorescenza ai raggi X a dispersione di energia (SEM-EDS). La metodologia analitica integrata ha permesso un notevole allargamento dello spettro dei risultati ottenuti, consentendo una caratterizzazione completa dei materiali e dei loro costituenti in un ampio intervallo dimensionale, composizionale e tessiturale. I risultati ottenuti, sebbene altamente accurati, sono strettamente qualitativi, in particolare per quanto concerne la determinazione di una serie di parametri fondamentali per la ricostruzione dei mix design originari (quali i rapporti acqua/cemento e cemento/aggregato e la curva di distribuzione granulometrica degli inerti). A tal riguardo, diversi studi hanno recentemente testato procedure di analisi di immagine 2D per lo studio di componenti del calcestruzzo indurito, ottenendo risultati affidabili e oggettivi. Ciononostante, tali procedure analitiche non sono mai state applicate al sistema calcestruzzo nel suo insieme, a causa di limitazioni intrinseche delle tecniche di studio legate sia all'alto grado di polidispersione delle componenti del conglomerato cementizio, sia all'assenza di chiari traccianti colorimetrici in grado di consentire una rapida e chiara discriminazione digitale delle stesse. Al di là di tali problematiche, allo stato dell'arte l'analisi di immagine 2D risulta essere l'unica tecnica analitica in grado, almeno in via teorica, di fornire risultati rapidi, attendibili e oggettivi su un materiale caratterizzato da un grado di polidispersione così elevato. Conseguentemente, uno degli obbiettivi principali di questo progetto di ricerca è consistito nello sviluppo di un valido protocollo multiscala di preparazione dei campioni e acquisizione e analisi delle immagini per ricostruire completamente e quantitativamente i mix design dei calcestruzzi storici studiati. Tale approccio analitico innovativo si è dimostrato estremamente affidabile per l'ottenimento di una caratterizzazione completa di questi materiali eterogenei e poco standardizzati, e i risultati ottenuti sono stati confrontati con successo con quelli ottenuti tramite lo studio multi-analitico. Infine, è stato effettuato uno studio dettagliato dello stato di conservazione e dei fenomeni di degrado agenti sui materiali. I calcestruzzi sono stati studiati con un approccio multi-analitico articolato in uno studio petrografico preliminare, integrato da analisi XRPD di profilo della frazione fine dei materiali e da analisi SEM-EDS sia su campioni massivi che in sezione sottile. I risultati hanno evidenziato l'incidenza nei materiali di molteplici fenomeni di alterazione, strettamente correlati alle loro caratteristiche composizionali e tessiturali e alle condizioni ambientali di esposizione. Oltre all'individuazione di forme comuni di alterazione del calcestruzzo, quali la carbonatazione, l'attacco solfatico, l'attacco da cloruri, le reazioni alcali-aggregato e di ricristallizzazione di sali solubili, una nuova tipologia di degrado è stata per la prima volta osservata e studiata nei campioni di calcestruzzo dell'Area Ex-Agrimont, l'attacco sinergico solfatico-fosfatico. Questa forma di alterazione è stata investigata approfonditamente attraverso un approccio multi-analitico di profilo, consistente in una combinazione di microscopia ottica, micro-XRPD in luce di sincrotrone, microanalisi SEM-EDS, XRPD termica in situ, analisi termogravimetriche e termiche differenziali simultanee (TGA-DTA), spettroscopia di emissione atomica a plasma accoppiato induttivamente (ICP-OES) e modeling termodinamico. Tale forma di alterazione è risultata essere strettamente legata all'interazione tra inquinanti atmosferici ricchi in solfati e soluzioni ricche in fosfati e ioni ammonio rilasciati dall'impianto di produzione di fertilizzanti, e ha causato una grave decalcificazione delle matrici cementizie e la formazione di fosfati e solfati secondari secondo una marcata zonazione mineralogica e tessiturale, con associata stabilizzazione di fasi metastabili a causa dei particolari gradienti di pH e concentrazione degli inquinanti venutisi a stabilire all'interno dei materiali. Inoltre, si sono formate rare fasi in soluzione solida, le quali hanno successivamente subito fenomeni di parziale disidratazione correlati alle condizioni di esposizione.
ALIBERTI, ALESSANDRO. "Machine learning techniques to forecast non-linear trends in smart environments." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2846613.
Повний текст джерелаFondevilla, Moreu Cristian. "A computacional model to predict land-use and cover changes in mountain landscapes." Doctoral thesis, Universitat de Lleida, 2014. http://hdl.handle.net/10803/284853.
Повний текст джерелаD'ençà de la segona meitat del segle XX s'ha observat una expansió del bosc a les zones de muntanya europees, originada per l'abandonament de l'agricultura. La reducció de la intensitat agrícola comporta la desaparició de prats i pastures alpins seminaturals de gran valor ecològic i estètic. Aquesta tesi proposa un model computacional utilitzant P sistemes per simular l'evolució futura del paisatge agrícola als Pirineus catalans i a la Vall de Stubai, situada als Alps centrals, durant un període de 30 anys. En aquestes regions s'han establert tres escenaris a simular: (1) continuació de la tendència ramadera observada, o manteniment del statu quo, (2) reducció significativa i (3) molt forta de la càrrega ramadera. Els resultats obtinguts mostren com la superfície agrícola tradicional es redueix en tots els escenaris simulats en ambdues àrees d'estudi. Per tant, és important aplicar noves estratègies per preservar aquestes superfícies culturals i els múltiples serveis de l'ecosistema per a les futures generacions, abans que desapareguin definitivament.
Desde la segunda mitad del siglo XX se ha observado un expansión del bosque en las zonas de montaña europeas, originada por el abandono de la agricultura. La reducción de la intensidad agrícola implica la desaparición de prados y pastos alpinos seminaturales de gran valor ecológico y estético. Esta tesis propone un modelo computacional utilizando P sistemas para simular la evolución futura del paisaje agrícola en los Pirineos catalanes y en el Valle de Stubai, situado en los Alpes centrales, durante un periodo de 30 años. En estas regiones se han establecido tres escenarios a simular: (1) continuación de la tendencia ganadera observada, o mantenimiento del statu quo, (2) reducción significativa y (3) muy fuerte de la carga ganadera. Los resultados obtenidos muestran como la superficie agrícola tradicional se reduce en todos los escenarios simulados en las dos áreas de estudio. Por lo tanto, es importante aplicar nuevas estrategias para preservar estas superficies culturales y los múltiples servicios del ecosistema para las futuras generaciones, antes de que desaparezcan definitivamente.
Albiol, Graullera Pablo. "Architecture Design and Interoperability Analysisof a SCADA System for the Power Network Control and Management." Thesis, KTH, Mekatronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217798.
Повний текст джерелаSCADA (Supervisory Control and Data Acquisition) systems have been widely used during the last decades delivering excellent results for the power network operation and management. However, some current customer requirements are for SCADA systems to integrate external components in order to perform advanced power network studies and develop both existing and new business processes. This novel viewpoint will make these systems evolve from a monolithic infrastructure towards a loosely coupled and flexible architecture. Hence, new needs have arisen with the aim of improving the system interoperability, reducing the complexity and enhancing the maintainability. This master´s thesis project presents an Interoperability Prediction Framework (IPF), that supports the architecture design process during the early stages of product development. In addition, this work has also investigated some alternative architectures, which have been modelled and verified using the previously mentioned framework. A first conceptual architecture has been designed to improve the internal system interoperability, reducing the coupling between the basic SCADA and the Energy Management System (EMS). Later, a second architecture that allows the integration of external components has been introduced to promote the external interoperability. Results show that the proposed architectures are correct (according to the IPF) and the interoperability of the system is improved. Furthermore, initial conclusions suggest that the final proposed solution would be less complex than the current architecture in the long term, although a large effort and substantial changes would be needed to upgrade the system architecture.
Miola, Andrea. "Spettroscopia SINFONI delle regioni centrali dell'ammasso globulare NGC 6569." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18751/.
Повний текст джерелаMurlà, Tuyls Damián. "Coordinated management of urban wastewater systems by means of advanced environmental decision support systems." Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/116813.
Повний текст джерелаEn les darreres dècades, i degut a la implementació de la Directiva Marc de l’Aigua, la gestió del cicle urbà de l’aigua ha esdevingut més complexa. S’introdueix el concepte de gestió integrada de conca, i és necessari considerar certa informació, com les característiques de la xarxa de clavegueram o del medi receptor. D’aquesta manera, els sistemes de suport a la decisió ambiental (EDSS) són eines potentíssimes que faciliten la presa de decisions en aquest camp. S’ha desenvolupat un nou EDSS per a la gestió integrada de conca que utilitza una base sòlida de coneixement expert, integrant informació de diverses fonts (bibliogràfiques, teòriques o històriques) i dos sistemes virtuals basats en dades reals sobre els quals és possible realitzar simulacions. Els resultats demostren que aquest sistema presenta beneficis importants respecte a una gestió estàndard sense sistema expert, i esperona a prosseguir amb la recerca i el desenvolupament per a millorar-lo
Grant, Michael. "New modelling and simulation methods to support clean marine propulsion." Thesis, 2021. http://hdl.handle.net/1828/13308.
Повний текст джерелаGraduate
Lekwene, Papi. "Modelling the atmospheres of A-stars using ATLAS9 with OPAL EOS / Papi Lekwene." Thesis, 2014. http://hdl.handle.net/10394/16280.
Повний текст джерелаAhmadi, Zohrab. "Mechanistic insight into homogeneous catalytic reactions by ESI-MS." Thesis, 2013. http://hdl.handle.net/1828/4859.
Повний текст джерелаGraduate
0486
zohrabahmadi@gmail.com
Fadakar, Alghalandis Younes. "Stochastic modelling of fractures in rock masses." Thesis, 2014. http://hdl.handle.net/2440/92338.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2014
Lye, Che Yee. "Towards a comprehensive model of English as a second language learning and teaching in the Malaysian independent Chinese secondary schools." Thesis, 2016. http://hdl.handle.net/2440/100653.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Education, 2016.
Joong, Kenneth. "Implementation of Roller Blind, Pleated Drape and Insect Screen Models into the CFC Module of the ESP-r Building Energy Simulation Tool." Thesis, 2011. http://hdl.handle.net/10012/6199.
Повний текст джерелаJoe, John. "Parametric Design & an Approach to Weight Optimization of a Metallic and Carbon Fiber Wing." Thesis, 2019. http://hdl.handle.net/1805/19978.
Повний текст джерелаIn a multifidelity structural design process, depending on the required analysis, different levels of structural models are needed. Within the aerospace design, analysis and optimization community, there is an increasing demand for automatic generation of parametric feature tree (build recipe) attributed multidisciplinary models. Currently, this is mainly done by creating separate models for different disciplines such as mid-surface model for aeroelasticity, outer-mold line for aerodynamics and CFD, and built-up element model for structural analysis. Since all of these models are built independently, any changes in design parameters require updates on all the models which is inefficient, time-consuming and prone to deficiencies. In this research, Engineering Sketch Pad (ESP) is used to create attribution and maintain consistency between structural models with different fidelity levels. It provides the user with the ability to interact with a configuration by building and/or modifying the design parameters and feature tree that define the configuration. ESP is based an open-source constructive solid modeler, named OpenCSM, which is built upon the OpenCASCADE geometry kernel and the EGADS geometry generation system. The use of OpenCSM as part of the AFRL’s CAPS project on Computational Aircraft Prototype Syntheses for automatic commercial and fighter jet models is demonstrated. The rapid generation of parametric aircraft structural models proposed and developed in this work will benefit the aerospace industry with coming up with efficient, fast and robust multidisciplinary design standardization of aircraft structures. Metallic aircraft wings are usually not optimized to their fullest potential due to shortage of development time. With roughly \$1000 worth of potential fuel savings per pound of weight reduction over the operational life of an aircraft, airlines are trying to minimize the weight of aircraft structures. A stiffness based strategy is used to map the nodal data of the lower-order fidelity structural models onto the higher-order ones. A simple multi-fidelity analysis process for a parametric wing is used to demonstrate the advantage of the approach. The loads on the wing are applied from a stick model as is done in the industry. C program is created to connect the parametric design software ESP, analysis software Nastran, load file and design configuration file in CSV format. This problem gets compounded when it comes to optimization of composite wings. In this study, a multi-level optimization strategy to optimize the weight of a composite transport aircraft wing is proposed. The part is assumed to initially have some arbitrary number of composite super plies. Super plies are a concept consisting of a set of plies all arranged in the same direction. The thickness and orientation angles of the super plies are optimized. Then, each ply undergoes topometry optimization to obtain the areas of each super ply taking the least load so that it could be cut and removed. Each of the super plies are then optimized for the thickness and orientation angles of the sub plies. The work presented on this paper is part of a project done for Air Force Research Laboratory (AFRL) connecting the parametric geometry modeler (ESP) with the finite element solver (Nastran).
Santos, Nuno António Lira Fernandes Faria. "Implementação de processos de negócio em software utilizando transformações de modelos." Master's thesis, 2009. http://hdl.handle.net/1822/46745.
Повний текст джерелаDado que as organizações se regem por processos de negócio, é emergente a necessidade de o desenvolvimento do sistema de informação de uma organização seja direccionado para suportar esses processos. Durante um processo de desenvolvimento de sistemas de informação são conhecidas várias abordagens e metodologias com o objectivo de este seja obtido com cada vez maior acréscimo de qualidade. Essa qualidade deve-se reflectir na definição dos processos do sistema de informação e deve requerer uma metodologia que possua tarefas bem definidas e automatizadas. Uma metodologia possível, a Business Implementation Methodology (BIM), propõe transformações dos processos de negócio de forma automatizada para que a implementação dos processos em software consuma menor esforço e menores custos. As quatro fases da metodologia são percorridas desde a definição inicial dos processos de negócio até ao sistema de informação final. O que distingue nesta fase das outras metodologias é a proposta de utilizar modelos de referência de processos. Dado o contexto, sugere-se a utilização de linguagens de modelação de processos para representação gráfica dos processos de negócio. Para obtenção do sistema de informação na última fase da metodologia seguida, é proposta a utilização do Model-Driven Architecture (MDA). A transformação de um modelo de processos de negócio que seja um Platform Independent Model (PIM) para um modelo que seja um Platform Specific Model (PSM) permitirá a obtenção da implementação do modelo de processos em software. O resultado da transformação será um modelo composto pelo processo de negócio em BPEL e pela devida integração de aplicações realizadas através do uso de um Enterprise Service Bus (ESB).
Due the fact that organisations rule their business by business processes, it is emerging the need that development of the information system should be oriented to support those processes. During the process of an information system development many approaches are known so it can be achieved with an increase of quality. This quality must be reflected in the definition of the information system’s business processes and it requires a methodology that has well defined and automated tasks. A possible methodology, the Business Implementation Methodology (BIM), proposes transformations of business processes in an automated way so software implementation of the processes are less effort consuming. The four methodology phases are executed since the initial definition of the business process to the final information system. What distinguishes this methodology from other business implementation methodologies in these initial phases is the use of process reference models proposal. In the context, it is suggested the use of business process modelling languages for visual representation of business processes. For obtaining the information system in the last phase of the methodology, it is proposed the use of OMG’s Model-Driven Architecture (MDA). The transformation of a process framework that is a Platform Independent Model (PIM) to a Platform Specific Model (PSM) will allow obtaining software implementation. The result of the transformation will be a model composed by the business process in BPEL and the integration of applications through the use of an Enterprise Service Bus (ESB).