Tesis sobre el tema "SyR modellyng"
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Hebeler, Felix. "Modelling topographic uncertainty : impacts on large scale : environmental modelling /". Zürich, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000253809.
Texto completoLópez, Martinez Carlos. "Multidimensional speckle noise. Modelling and filtering related to sar data". Doctoral thesis, Universitat Politècnica de Catalunya, 2003. http://hdl.handle.net/10803/6921.
Texto completoDarling, Paul Simon. "SAR modelling for ecological applications". Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297315.
Texto completoSun, Tianhua. "Modelling an SBR waste treatment system". Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/10330.
Texto completoGrover, Kevin Grover. "Studying forestry in Brazilian Amazonia using synthetic aperture radar". Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387755.
Texto completoEngström, Iris. "Steady-state hydrogeological modelling in order to investigate groundwater sensitivity". Thesis, KTH, Mark- och vattenteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171824.
Texto completoAchermann, David. "Modelling, simulation and optimization of maintenance strategies under consideration of logistic processes /". Zürich : ETH, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000259627.
Texto completoFournier, Mathew. "Investigations into the Shear Strength Reduction method using distinct element models". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2492.
Texto completoKajaman, Aboajela. "Modelling and control of an activated sludge process using ASM2d and taking into account sludge floc distribution effects". Thesis, De Montfort University, 2015. http://hdl.handle.net/2086/11422.
Texto completoCochrane, Christopher Gordon. "Topographic modelling from SAR imagery of impact craters on Venus". Thesis, Imperial College London, 2005. http://hdl.handle.net/10044/1/11454.
Texto completoTian, Xinna. "Study on mixing, modelling and control of an SCR system". Thesis, University of Strathclyde, 2016. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27075.
Texto completoLópez, Martinez Carlos. "Multidimensional speckle noise, modelling and filtering related to SAR data /". Köln : DLR, Bibliotheks- und Informationswesen, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015380575&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Texto completoEdwards, Earl Peter Fitz-Gerald. "Digital surface modelling in developing countries using spaceborne SAR techniques". Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/10157/.
Texto completoIervolino, P. "Ship detection with SAR : modelling, designing and real data validation". Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/809956/.
Texto completoHussaini, Nafiu. "Mathematical modelling and analysis of HIV transmission dynamics". Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/5672.
Texto completoMora, Pérez Javier. "Control-oriented modelling and diagnostics of diesel after-treatment catalysts". Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/115937.
Texto completo[CAT] Esta tesi doctoral abasta el desenvolupament d'algoritmes orientats a millor el sistema de control d'emissions en motors Diesel. Per a este propòsit, la inclusió en el vehicle de sensor embarcats com els de temperatura, els de NOx o el d'NH3 permet realitzar el diagnòstic a bord dels sistemes de post-tractament focus d'este treball, els quals són el DOC i el SCR. Així doncs, l'objectiu és el de satisfer les normatives de diagnòstic a bord per a mantindre les emissions per baix de l'umbral permés per la normativa al llarg del temps. Els tests experimentals, incloent les mesures amb analitzador de gasos, permeten obtindre una visió més àmplia de les espècies en la línia d'escapament. Complementàriament, s'utilitzen unitats noves i envellides per tal de tindre l'efecte experimental de l'envelliment en els catalitzadors. D'aquesta manera, s'analitza l'efecte de la temperatura, la despesa d'escapament, les concentracions de les espècies i l'envelliment en el DOC i en el SCR, així com l'avaluació d'algunes mesures rellevants realitzades pels sensors. Les temperatures tenen una influència destacada en el funcionament dels catalitzadors, pel que es requerix l'avaluació de les mesures dels sensors de temperatura, junt amb el desenvolupament de models de transmissió de calor, per a alimentar les funcions a continuació desenvolupades. En este sentit, la mesura lenta del sensor a l'entrada del DOC es millora en condicions transitòries mitjançant una tècnica de fusió de la informació basada en un filtre de Kalman. Després, es presenta un model de transmissió de calor 1D i un model agrupat 0D, en els quals s'avaluen les entrades a l'entrada segons l'ús del model. Per altra banda, es presenta una tècnica per a estimar l'increment de temperatura degut a l'oxidació dels polsos de post-injecció en el DOC. Es proposen models per a DOC i SCR per a estimar l'efecte de l'envelliment en les emissions, en els quals es modela el factor d'envelliment com un paràmetre sintonitzable, que permet variar des d'estats nous a envellits. Per altra banda, un model agrupat 0D _es desenvolupat per al DOC amb el propòsit d'estimar la relliscada de HC i CO, el qual és validat en un WLTC per a després ser usat en simulació. Per altra banda, un model 1D i un model 0D es desenvolupen per al SCR, els quals s'usen a continuació per a alimentar l'estratègia de diagnòstic i per a simulació. Finalment, les estratègies de diagnòstic es presenten per a la fallada total o retirada del DOC, així com per a l'estimació de l'eficiència en DOC i SCR. Per altra banda, la primera estratègia es divideix en passiva i activa, en la que s'utilitzen post-injeccions en la activa per a excitar el sistema i confirmar la fallada total si es dona el cas. A continuació, l'eficiència del DOC s'estima a través d'una tècnica indirecta en la que la temperatura d'activació es detecta i es relaciona amb l'increment d'emissions a través del model. Per altra banda, es desenvolupa un observador per a estimar l'estat d'envelliment del SCR, el qual està basat en un filtre de Kalman extés. No obstant això, per a evitar associar baixa eficiència degut a pobre qualitat de l'urea injectada a l'envelliment del SCR, un indicador de la qualitat de l'urea s'executa en paral·lel.
[EN] This dissertation covers the development of algorithms oriented to improve the emission control system of Diesel engines. For this purpose, the inclusion of on-board sensors like temperature, NOx and NH3 sensors allows performing on-board diagnostics to the after-treatment systems focus of this work, which are the DOC and the SCR system. Then, the target is to meet on-board diagnostics regulations in order to keep emissions below a regulation threshold over time. Experimental tests, including gas analyzer measurements, allow having a wider view of the species in the exhaust line. Complementary, new and aged units are used in order to have the experimental effect of ageing on the catalysts. Then, the effect of temperature, exhaust mass flow, species concentrations and ageing is analyzed for DOC and SCR, in combination with the assessment of some relevant sensors measurements. As a result, the characteristics, opportunities and limitations extracted from experimental data are used as the basis for the development of models and diagnostics techniques. The assessment of temperature sensors measurements, along with the development of heat transfer models is required to feed temperature dependent functions. In this sense, the slow measurement of the DOC upstream temperature sensor is improved in transient conditions by means of a data fusion technique, based on a fast model and a Kalman filter. Then, a 1D and a 0D lumped heat transfer models are presented, in which the upstream inputs are assessed in relation to its use. On the other hand, a technique to estimate the temperature increase due to post-injection pulses oxidation is also presented. Both DOC and SCR models are proposed in order to estimate the effect of ageing on emissions, in which an ageing factor is modelled as a tunable parameter that allows varying from new to aged states. On the one hand, a 0D lumped model is developed for DOC in order to estimate the HC and CO species slip, which is validated in a WLTC and is then used for simulation. On the other hand, a 1D and a 0D models are developed for SCR, which are then used to feed the diagnostics strategy and for simulation. Finally, diagnostics strategies are presented for total failure or removal of DOC, as well as for efficiency estimation of DOC and SCR. On the one hand, the former strategy is separated into passive and active diagnostics, in which post-injections are used in active diagnostics in order to excite the system and confirm a total failure, in case. Then, the DOC efficiency estimation is done by means of an indirect technique in which the light-off temperature is detected and an emissions increase is related by means of the DOC ageing model. On the other hand, an observer to estimate the SCR ageing state is developed, which is based on an extended Kalman filter. However, in order to avoid associating low SCR efficiency to ageing, an indicator of the injected urea quality is developed to run in parallel.
Mora Pérez, J. (2018). Control-oriented modelling and diagnostics of diesel after-treatment catalysts [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/115937
TESIS
Gustafsson, Magnus. "Evaluation of StochSD for Epidemic Modelling, Simulation and Stochastic Analysis". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-426227.
Texto completoMaccari, Pietro <1992>. "Modelling and Uncertainty Quantification application to SA simulation codes in advanced SMR". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10122/1/Thesis_PHD_Maccari.pdf.
Texto completoLinden, Sandra van der. "Icy rivers heating up : modelling hydrological impacts of climate change in the (sub)arctic /". Amsterdam : Utrecht : Koninklijk Nederlands Aardrijkskundig Genootschap ; Faculteit Ruimtelijke Wetenschappen, Universiteit Utrecht, 2002. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010495642&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Texto completoWahle, Christian. "Die Technik der Weil-Restriktion für Huber- und Berkovich-Räume und Anwendungen zu adischen Néron-Modellen /". Münster, 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000252276.
Texto completoTansey, 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.
Texto completoSternberg, My y Julia Lindstedt. "Svenska modellen en självklarhet? : Arbetsgivares syn på förhållande till fackförbund". Thesis, Stockholms universitet, Sociologiska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-156504.
Texto completoAbidi, Amna. "Imperfect RDF Databases : From Modelling to Querying". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2019. http://www.theses.fr/2019ESMA0008/document.
Texto completoThe ever-increasing interest of RDF data on the Web has led to several and important research efforts to enrich traditional RDF data formalism for the exploitation and analysis purpose. The work of this thesis is a part of the continuation of those efforts by addressing the issue of RDF data management in presence of imperfection (untruthfulness, uncertainty, etc.). The main contributions of this dissertation are as follows. (1) We tackled the trusted RDF data model. Hence, we proposed to extend the skyline queries over trust RDF data, which consists in extracting the most interesting trusted resources according to user-defined criteria. (2) We studied via statistical methods the impact of the trust measure on the Trust-skyline set.(3) We integrated in the structure of RDF data (i.e., subject-property-object triple) a fourth element expressing a possibility measure to reflect the user opinion about the truth of a statement.To deal with possibility requirements, appropriate framework related to language is introduced, namely Pi-SPARQL, that extends SPARQL to be possibility-aware query language.Finally, we studied a new skyline operator variant to extract possibilistic RDF resources that are possibly dominated by no other resources in the sense of Pareto optimality
Mazoyer, Marie. "Impact du processus d'activation sur les propriétés microphysiques des brouillards et sur leur cycle de vie". Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0025/document.
Texto completoFogs are complex meteorological systems dealing with fine scale processes. Their lifecycles are closely related to the interactions between radiation, fog dynamics, turbulence and fog microphysics that make their forecasting difficult. Fogs are formed by the activation of aerosols particles into water droplets. To date, understanding the impact of the aerosols properties on the fog life cycle remains still challenging. This thesis aims at investigating the impact of activation processes on fog microphysics and lifecycles. In the framework of the PréViBoss project, in-situ measurements of fog properties were performed during winters 2010 to 2013 at the SIRTA site in the south of Paris. A detailed characterization of aerosols and fog microphysics, including number size spectrum of both particles under dry and wet conditions and droplets, was performed in order to investigate the aerosols efficiency to act as cloud condensation nuclei (CCN). A large number of case studies are presented, which include 23 case studies on fog formation from the activation of aerosols and 48 fog events on the temporal evolution of fog microphysics. An original method has been used to investigate the link between supersaturation values and concentrations of CCN with aerosols properties (distribution, concentration and hygroscopicity). We show that supersaturation values determine the droplets concentration, independently of the concentration of aerosols. The evolution of fog microphysics of the 48 cases follows 4 phases with distinct behaviours, driven by condensation/evaporation and deactivation/ activation processes. The fog droplets concentration is determined during the first phase, then it fluctuate around this value during fog life cycle. Large eddy simulation of fog cases observed during PréViBoss are performed with the Meso-NH model to evaluate the impact of microphysics on fog lifetime. It allows to explore the close interactions between aerosols and physical processes. A two moments scheme is used for microphysic and two schemes for supersaturation have been evaluated, the first one estimate the maximal supersaturation and the second one considers a pseudoprognostic evolution of supersaturation following Thouron et al. (2012). Much lower supersaturation values were obtained with the second scheme. Addtional processes, such as condensation or mixing that were not included in previous scheme, are modeled. While CCN concentrations obtained with this new scheme are lower, they remain higher than the observations. We postulate that this behaviour could be due to the representation of dynamics. Sensibilitiy tests for different aerosols concentrations reveal a weak impact on fog life cycle. Only for extreme cases where the aerosol concentrations are low, the fog dissipation is delayed. This study shows that the fog life cycle is mainly driven by thermodynamics, dynamics and surface conditions through their impact on boundary layer stability. Moreover, surface heterogeneities greatly modify fog life cycle trough turbulent motions and should be considered for future experimental studies
Taulis, Mauricio. "Groundwater characterisation and disposal modelling for coal seam gas recovery". Thesis, University of Canterbury. Civil Engineering, 2007. http://hdl.handle.net/10092/3104.
Texto completoFaria, Bernardes Daniel. "Information Diffusion in Complex Networks : Measurement-Based Analysis Applied to Modelling". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-01001763.
Texto completoJebali, Fatma. "Formal framework for modelling and verifying globally asynchronous locally synchronous systems". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAM036/document.
Texto completoA GALS (Globally Asynchronous, Locally Synchronous) system consists of several synchronouscomponents that evolve concurrently, each with its own pace, and communicatealtogether asynchronously. This thesis proposes a formal modelling and verificationframework dedicated to GALS systems, with a focus on the asynchronous behaviour.As a cornerstone of our framework, we have designed a formal language, named GRL(GALS Representation Language). GRL enables the behavioural specification of synchronouscomponents, asynchronous communication, and constraints involving bothcomponent paces and the data carried by component inputs. To analyse GRL specifications,we took advantage of the CADP software toolbox for the verification of asynchronousconcurrent processes, using state space exploration techniques. For this purpose,we defined a translation from GRL to the LNT specification language supportedby CADP. The translation was implemented by a tool named GRL2LNT, thus enablingstate spaces to be automatically derived from GRL specifications.To enable the formal verification of GRL specifications, we designed a property specificationlanguage, named muGRL, which is interpreted on GRL state spaces. The muGRLlanguage is based on a set of patterns capturing properties of concurrent and GALSsystems, which reduces the complexity of using full-fledged temporal logics. The semanticsof muGRL are defined by a translation into the MCL temporal logic supported byCADP. Finally, we illustrated how GRL, muGRL, and CADP can be applied to modeland verify concrete GALS applications, including industrial case-studies
Tran, Quoc-Tran. "Some contributions to financial market modelling with transaction costs". Thesis, Paris 9, 2014. http://www.theses.fr/2014PA090036/document.
Texto completoThis thesis deals with different problems related to markets with transaction costs and is composed of four parts.In part I, we begin with the study of assymptotic hedging a European option in a local volatility model with bid-ask spread.In part II, we study the optimal consumption problem in a Kabanov model with jumps and with default risk allowed.In part III, we sugest a general market model defined by a liquidation procès. This model is more general than the models with both fixed and proportional transaction costs. We study the problem of super-hedging an option, and the arbitrage theory in this model.In the last part, we study the utility maximization problem under expected risk constraint
Giustarini, Laura [Verfasser] y Thomas [Akademischer Betreuer] Udelhoven. "Integrating remote sensing information from SAR sensors and hydraulic modelling / Laura Giustarini ; Betreuer: Thomas Udelhoven". Trier : Universität Trier, 2016. http://d-nb.info/1197807314/34.
Texto completoElbialy, Samy Gamal Khedr. "Potential of Spaceborne X & L-Band SAR-Data for Soil Moisture Mapping Using GIS and its Application to Hydrological Modelling: the Example of Gottleuba Catchment, Saxony / Germany". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-66626.
Texto completoMoretto, Irene. "Aspetti numerici nell'applicazione del modello SIR". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/22165/.
Texto completoJestin, Camille. "Modélisation analogique du glissement sur une faille". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH017/document.
Texto completoThe presence of defaults on the surface of tectonic faults can affect the behaviour of the rupture along those interfaces. However, because of the limited resolution of the faults imaging at depth, the implication of these heterogeneities remains hard to quantify. We present here an analogic approach enabling the precision of the impact of the heterogeneities on the fracture propagation. On one hand, this analysis lays on the use of an experimental setup ensuring the monitoring of a fracture propagating under an imposed stress, normal to the rupture interface (mode I). The used model, implying an acoustic and an optical monitoring of the fracture front advance, leads us to the determination of the impact of asperities on the energy partitioning between seismic and aseismic processes. We make the link between radiation efficiency and rupture velocity, locally affected by the presence of microstructures along the interface. On another hand, to extend our results to other rupture modes, which are observed more often during rupture on tectonic faults, we get interested in the adaptation of our experimental setup for the observation of a fracture propagating under shear stress (mode III). The analysis of morphologic and dynamic properties of the mode III crack advance shows results similar to those obtained for mode I. This suggests eventually that the results observed in mode I can be extended to other rupture modes
Randuineau, Benoît. "Interactions entre pathogènes : quels impacts sur la santé publique ?" Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066645/document.
Texto completoThe study of pathogens is a keystone of considerable progress for Public Health in the last decades. Nowadays, a promising field of study are interactions between pathogens circulating in the same populations. Indeed, just as any living species, a pathogen is part of an ecosystem, and within this ecosystem it interacts with numerous things, including other pathogens. In this PhD thesis we have been interested in the consequences of such interactions at several scales. Firstly a wide bibliographic work has been accomplish in order to identify known and documented interactions. From this work we propose several categories of interactions and point out the gaps in this literature. Then we explored the potential consequences on population of several interactions described in the first part, and tested promising methods to detect such interaction from population-scale data. Lastly we focused on the specific example of dengue, where four strongly interacting serotypes and current vaccine developments rise the issue of the interference between interactions and Public Health policies. A broader vision of pathogens dynamics rises from the embedding of pathogens into a community, and this vision could benefit from progress in statistical methods and theoretical models
Mazzilli, Naomi. "Sensibilité et incertitude de modélisation sur les bassins méditerranéens à forte composante karstique". Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20188/document.
Texto completoKarst aquifers are associated with key issues for water resource management and also for flood risk mitigation. These systems are characterized by a highly heterogeneous structure and non-linear functioning. This thesis addresses the sensitivity and uncertainty associated with the numerical modelling of groundwater flow in karst systems. As a systematic approach, sensitivity analysis has been used to answer the following questions:(i) is it possible to calibrate the model ? (ii) is the calibration robust ? (iii) is it possible to reduce equifinality, through multi-objective calibration or through multi-variable calibration ? This contribution stresses the potentialities of local sensitivity analyses. Despite their inherent limitations (local approximation), local analyses have proved to bring valuable insights into the general behaviour of complex, non-linear flow models, at little computational cost. Besides, this contribution also stresses the interest of multi-variable calibration as compared to multi-objective calibration, as regards equifinality reduction
Herculano, Miguel Colburn. "Modelling long-term worker´s compensation : an application to a general insurance company". Master's thesis, Último nome, Primeiro nome. data de publicação. "Título". Dissertação de Mestrado. Universidade de Lisboa. Instituto Superior de Economia e Gestão, 2013. http://hdl.handle.net/10400.5/6043.
Texto completoThis paper resumes the main findings from modeling life underwriting risks to which Worker´s Compensation is exposed. Models presented aim to shorten the path between ad hoc procedures in place and the new capital requirements foreseen by Solvency II. The legal framework of this line of business is primarily explained as it is determinant for modeling purposes. We then provide a discussion about risk models in use, major options, assumptions and other relevant issues that were regarded when modeling this line of business.
Braun, Mathias. "Reduced Order Modelling and Uncertainty Propagation Applied to Water Distribution Networks". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0050/document.
Texto completoWater distribution systems are large, spatially distributed infrastructures that ensure the distribution of potable water of sufficient quantity and quality. Mathematical models of these systems are characterized by a large number of state variables and parameter. Two major challenges are given by the time constraints for the solution and the uncertain character of the model parameters. The main objectives of this thesis are thus the investigation of projection based reduced order modelling techniques for the time efficient solution of the hydraulic system as well as the spectral propagation of parameter uncertainties for the improved quantification of uncertainties. The thesis gives an overview of the mathematical methods that are being used. This is followed by the definition and discussion of the hydraulic network model, for which a new method for the derivation of the sensitivities is presented based on the adjoint method. The specific objectives for the development of reduced order models are the application of projection based methods, the development of more efficient adaptive sampling strategies and the use of hyper-reduction methods for the fast evaluation of non-linear residual terms. For the propagation of uncertainties spectral methods are introduced to the hydraulic model and an intrusive hydraulic model is formulated. With the objective of a more efficient analysis of the parameter uncertainties, the spectral propagation is then evaluated on the basis of the reduced model. The results show that projection based reduced order models give a considerable benefit with respect to the computational effort. While the use of adaptive sampling resulted in a more efficient use of pre-calculated system states, the use of hyper-reduction methods could not improve the computational burden and has to be explored further. The propagation of the parameter uncertainties on the basis of the spectral methods is shown to be comparable to Monte Carlo simulations in accuracy, while significantly reducing the computational effort
Ganigué, Pagès Ramon. "Partial nitritation of landfill leachate in a SBR prior to an anammox reactor : operation and modelling". Doctoral thesis, Universitat de Girona, 2010. http://hdl.handle.net/10803/7805.
Texto completoUrban landfill leachate are highly contaminated wastewater, usually characterised by high ammonium concentrations and low biodegradable organic matter content. Treating leachate through conventional nitrification-denitrification processes is expensive due to its high oxygen demand and the requirement of a supplementary external carbon source. In recent years, the feasibility of treating such streams with a low C:N ratio by a combined partial nitritation-anammox process has been demonstrated. This thesis deals with the treatment of landfill leachate by a partial nitritation-SBR, as a preparative step for an anammox reactor. The results of the study have demonstrated the feasibility of this technology for the treatment of landfill leachate. The work evolved from initial lab-scale studies, where the process was first tested, to a successful long-term experiment at pilot-scale. In addition, the thesis also includes the development, calibration and validation of a mathematical model of the process, aiming at increasing process knowledge.
Bourgin, François. "Comment quantifier l’incertitude prédictive en modélisation hydrologique ? : Travail exploratoire sur un grand échantillon de bassins versants". Thesis, Paris, AgroParisTech, 2014. http://www.theses.fr/2014AGPT0016/document.
Texto completoHydrological modelling aims to quantify the rainfall-runoff relationship at the catchment scale. Although hydrological models are generally able to provide an acceptable representation of the catchment behaviour, this representation is necessarily simplified and imperfect, as a consequence an evaluation of uncertainties is desirable. This thesis focuses on the quantification of predictive uncertainty in hydrological modelling. Our main objective was to explore several methods that can be used to complete the deterministic predictions of a rainfall-runoff model with probabilistic distributions. Two prediction cases were distinguished, namely simulation and forecast. We set up a comparative framework to evaluate different uncertainty quantification methods on a large set of French catchments. In simulation mode, we focused on two methods related to the parameter estimation issue, the GLUE uncertainty method and the Bayesian framework, as well as two more pragmatic approaches, a multi-model approach and the post-processing method. Our results suggest that the GLUE-like methods based on ensembles of various parameter sets do not provide an adequate representation of the total predictive uncertainty. An external model error is necessary. Post-processing methods that are flexible enough to adequately describe the residual errors of the hydrological model obtained during calibration give more satisfactory estimates of the modelling uncertainty. We also present a method able to transfer model uncertainty estimates from gauged to ungauged catchments. Our results demonstrate that the method holds interesting perspectives, providing in most cases reliable and sharp uncertainty bounds at ungauged locations. In a forecasting context, we compared several post-processing methods and evaluated the interactions between data assimilation and post-processing in an ensemble forecasting modelling chain. Results show the crucial role of the lead time on the estimates of predictive uncertainty. They also suggest that some improvement can be achieved when the evolution of flows is better taken into account by a post-processing method. Last, we investigated the interactions between data assimilation and post-processing in hydrological ensemble forecasting and showed the benefits of using both in an ensemble forecast system
Wang, Yuwei. "Evolution of microservice-based applications : Modelling and safe dynamic updating". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAS009.
Texto completoMicroservice architectures contribute to building complex distributed systems as sets of independent microservices. The decoupling and modularity of distributed microservices facilitates their independent replacement and upgradeability. Since the emergence of agile DevOps and CI/CD, there is a trend towards more frequent and rapid evolutionary changes of the running microservice-based applications in response to various evolution requirements. Applying changes to microservice architectures is performed by an evolution process of moving from the current application version to a new version. The maintenance and evolution costs of these distributed systems increase rapidly with the number of microservices.The objective of this thesis is to address the following issues: How to help engineers to build a unified and efficient version management for microservices and how to trace changes in microservice-based applications? When can microservice-based applications, especially those with long-running activities, be dynamically updated without stopping the execution of the whole system? How should the safe updating be performed to ensure service continuity and maintain system consistency?In response to these questions, this thesis proposes two main contributions. The first contribution is runtime models and an evolution graph for modelling and tracing version management of microservices. These models are built at design time and used at runtime. It helps engineers abstract architectural evolution in order to manage reconfiguration deployments, and it provides the knowledge base to be manipulated by an autonomic manager middleware in various evolution activities. The second contribution is a snapshot-based approach for dynamic software updating (DSU) of microservices. The consistent distributed snapshots of microservice-based applications are constructed to be used for specifying continuity of service, evaluating the safe update conditions and realising the update strategies. The message complexity of the DSU algorithm is not the message complexity of the distributed application, but the complexity of the consistent distributed snapshot algorithm
Auzerais, Anthony. "Impact d'un cylindre vertical sur la dynamique sédimentaire sous l'action d'un courant". Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH02/document.
Texto completoThis work concerns the study of sediment patterns formation downstream a vertical cylinder under a steady current. The cylinder simulates an offshore monopile foundation, or a bridge pile. A theoretical modeling is developed. The results are in good agreement with the experimental results obtained in the framework of this PhD. An experimental and theoretical preliminary study on sediment segregation in the vicinity of the cylinder is also performed
Girinon, Mathieu. "Développement d’un modèle numérique sur l’étude de l’intégrité des surfaces en perçage". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEE003/document.
Texto completoThe surface integrity has a significant impact on the fatigue life of the machined parts. New requirements appear from manufacturers and especially from aeronautical industrialists. Drilling holes are critical and can damage the component. Nevertheless, residual stresses are not studied a lot in drilling processes. The residual stresses created are a result of multi-physical phenomena during drilling processes. It is difficult to identify them due to the confinement of the hole. In the current study, experimental tests are realized and numerical model of drilling surface integrity was developed. First, experimental works were performed in several lubrication conditions to understand physical phenomena which lead to residual stresses in the drilled workpiece. The numerical developments are set-up about two sections. The first numerical model represents the drilling operation. The state of the art and an initial study were shown that the actual numerical models are not able to simulate a drilling operation in an important drilling depth. So the first numerical model gives an estimation of loads induced by the drilling operation and necessary to compute residual stresses. Finally, the second numerical model simulates residual stresses in a drilled part taking in account loads provided
van, Beijma Sybrand Jucke. "Remote sensing-based mapping and modelling of salt marsh habitats based on optical, LiDAR and SAR data". Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/32455.
Texto completoWiberg, Sara. "Matematisk vardagskompetens : Svenska gymnasielärares syn och undervisningspraxis". Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-78645.
Texto completoThe aim of this study was to investigate teachers’ views and teaching praxes when it comes to mathematical literacy. Four teachers were interviewed individually. When the teachers’ answers were analyzed, an analogous view was displayed, that mathematical literacy is about the mathematics one needs to be able to cope with one’s own everyday life. This view corresponds to the definition Organisation for Economic Co-operation and Development, OECD, has presented and that research in general refers to. The assignments with focus on mathematical literacy, that the teachers give their students, deals both with managing one’s own everyday life and a future everyday as an adult and skilled worker. The teachers’ teaching praxes differ when it comes to mathematical literacy. One of the teachers has a clear cooperation with the vocational teachers and the students receive therefore much mathematical literacy in the teaching. The teachers try, otherwise, to teach mathematical literacy to motivate the students for the teaching. How this is fulfilled is more or less structurally described. Deficiency of time, too large teaching groups and want of cooperation with the vocational teachers are mentioned as factors confining the focus the teachers have on mathematical literacy in the teaching.
Garcia-Rosales, G. "Effet de la température sur la rétention de U(VI) par SrTiO$_3$". Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00200303.
Texto completoBelleudy, Clément. "Modélisation des transferts d’air et leur impact sur le comportement hygrothermique de l'enveloppe des bâtiments". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREA0002/document.
Texto completoWithin the context of more stringent buildings codes, mastering airtightness is of importance to achieve energy efficient buildings. Unintended air leakage through the building envelope, which is due to bad design and poor workmanship, not only increases energy consumption, but also leads to moisture disorders, affecting building durability and occupants health. This moisture risk is present in particular for lightweight structures such as timber frame buildings, which are sensitive to air leakage.It is therefore necessary to better understand and to assess the impact of unintented air transfers on the hygrothermal field and the heat flux in the vicinity of an airtightness defect. To this end, two numerical models are developped, dealing with Heat-Air (HA) and Heat-Air-Moisture (HAM) transfer respectively. The HAM model is firstly validated in 1D using numerical benchmarks from literature. Then, temperature measurements in a cellulose insulation layer subjected to moist air flow are compared with the models outputs, and good agreement is obtained. The HAM model provides a better prediction of the temperature field compared to the HA model.Following this 2D experimental validation of the HAM model, it is applied to a complex defect geometry, including porous insulation materials and thin air gaps. This defect is meant to be realistic, as it is drawn from a measurement campaign aiming to identify typical envelope leakage points encountered in timber frame buildings.Long term simulations are performed under transient temperature and humidity conditions, in case of air exfiltration and air infiltration. This study helps identifying tendencies towards moisture risk: infiltrating air flow dries the assembly whereas exfiltrating air flow humidifies it. A methodology to assess heat fluxes through the defect is presented.Finally, a simplified approach is derived from the detailed HAM-model, to take into account the contribution of airtightness defects on the total heat loss on the building scale. It is shown that the additional heat loss induced by an airtightness defect may be described by a specific heat loss coefficient. In addition, the coupling between air flow and envelope has a significant impact on total heat flux calculations. The influence of moisture transfers on observed tendencies is also discussed
Karatsori, Theano. "Caractérisation et modélisation de UTBB MOSFET sur SOI pour les technologies CMOS avancées et applications en simulations circuits". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT035/document.
Texto completoΤhe motivation for this dissertation is two of the main issues brought up by the scaling of new-era devices in contemporary MOSFET design: the development of an analytical and compact drain current model, valid in all regions of operation describing accurately the transfer and output characteristics of short-channel FDSOI devices and the investigation of reliability and variability issues of such advanced nanoscale transistors. Chapter II provides a theoretical and technical background for the better understanding of this dissertation, focusing on the critical MOSFET electrical parameters and the techniques for their extraction. It demonstrates the so-called Y-Function and Split-CV methodologies for electrical characterization in diverse types of semiconductors. The influence of AC signal oscillator level on effective mobility measurement by split C-V technique in MOSFETs is also analyzed. A new methodology based on the Lambert W function which allows the extraction of MOSFET parameters over the full gate voltage range, enabling to fully capture the transition between subthreshold and above threshold region, despite the reduction of supply voltage Vdd is presented. Finally, some basic elements concerning the low frequency noise (LFN) on MOSFETs characterization are described. Chapter III presents the analytical drain current compact modeling in nanoscale FDSOI MOSFETs. Simple analytical models for the front and back gate threshold voltages and ideality factors have been derived in terms of the device geometry parameters and the applied bias voltages with back gate control. An analytical compact drain current model has been developed for lightly doped UTBB FDSOI MOSFETs with back gate control, accounting for small geometry and other significant in such technologies effects and implemented via Verilog-A code for simulation of circuits in Cadence Spectre. Chapter IV is dealing with reliability issues in FDSOI transistors. The hot-carrier degradation of nanoscale UTBB FDSOI nMOSFETs has been investigated under different drain and gate bias stress conditions. The degradation mechanisms have been identified by combined LFN measurements at room temperature in the frequency and time domains. Based on our analytical compact model of Chapter III, an HC aging model is proposed enabling to predict the device degradation stressed under different bias conditions, using a unique set of few model parameters determined for each technology through measurements. Finally, the NBTI stress characteristics and the recovery behavior under positive bias temperature stress of HfSiON gate dielectric UTBB FDSOI pMOSFETs have been investigated. A model for the NBTI has been developed by considering hole-trapping/detrapping mechanisms, capturing the temperature and bias voltage dependence. In Chapter V studies of variability issues in advanced nano-scale devices are presented. The main sources of drain and gate current local variability have been thoroughly studied. In this aspect, a fully functional drain current mismatch model, valid for any gate and drain bias condition has been developed. The main local and global variability MOSFET parameters have been extracted owing to this generalized analytical mismatch model. Furthermore, the impact of the source-drain series resistance mismatch on the drain current variability has been investigated for 28nm Bulk MOSFETs. A detailed statistical characterization of the drain current local and global variability in sub 15nm Si/SiGe Trigate nanowire pMOSFETs and 14nm Si bulk FinFETs has been conducted. Finally, a complete investigation of the gate and drain current mismatch in advanced FDSOI devices has been performed. Finally, the impact of drain current variability on circuits in Cadence Spectre is presented. An overall summary of this dissertation is presented in Chapter VI, which highlights the key research contributions and future research directions are suggested
Lind, Philip. "A study of modelling the energy system of an ice rink sports facility : Modelling the heating and cooling of ABB arena syd and implementation of renewable energy sources using TRNSYS". Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40054.
Texto completoLemaire, Vincent. "Modélisation de l'aérosol organique : impact sur la pollution longue-distance en Europe". Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1057/document.
Texto completoNowadays, particular pollution is at the center of many environmental concerns because of its health effects and of its interactions with climate issues. Organic aerosols represent an important part of particular matter. They can be directly emitted as particulate matter or results from the oxidation of many different volatile organic compounds in the atmosphere. Owing to the large variety of its biogenic and anthropogenic emission sources, organic aerosol composition as well as its formation and chemical aging processes are still questioning. Field observations of organic aerosol aging and transport are quite complex to set up. This is why modeling tools remain a necessary complementary approach to describe the formation and long-range transport of the organic fraction of particulate matter. For these reasons, this work focused on the identification and the simulation of some of the main processes controlling the formation and photochemical aging of organic aerosols. Based on an innovating approach, we developed an operational chemical scheme for air quality models dedicated to the simulation of semi-volatile primary compound emission and oxidation. Its implementation and its evaluation in the CHIMERE model have been conducted through a comparison with the summer and winter MEGAPOLI campaign database. In parallel, one objective of this work was to implement oligomerization processes in our model, since it is now recognized that this process is one major pathway for organic aerosol aging
Haglund, Therese y Anna Rahm. "Vad styr mikroföretags val av revisor? : En kvalitativ studie av fem mikroföretag i Uppsala". Thesis, Uppsala University, Department of Business Studies, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8620.
Texto completoShang, Lei y lei shang@ieee org. "Modelling of Mobile Fading Channels with Fading Mitigation Techniques". RMIT University. Electrical and Computer Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061222.113303.
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