Tesis sobre el tema "Driven diffusive model"
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O'Loan, Owen James. "Phase transitions and ordering in model driven diffusive systems". Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/12718.
Texto completoMukherjee, Sayak. "Applications of Field Theory to Reaction Diffusion Models and Driven Diffusive Systems". Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/39293.
Texto completoPh. D.
Pesheva, Nina Christova. "A mean-field method for driven diffusive systems based on maximum entropy principle". Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54398.
Texto completoPh. D.
Waseem, Abdullah. "Numerical Homogenization and Model Reduction for Transient Heat, Diffusion and coupled Mechanics Problems". Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0028.
Texto completoIn this thesis computationally efficient numerical homogenization techniques are presented for diffusion phenomena in heterogeneous materials. As a preliminary step, a model reduction for the transient heat diffusion equation is performed at the micro-scale using component mode synthesis, which provides an emergent enriched-continuum description at the macro-scale. Based on the location of the enrichmentvariables, either on the finite element nodes or the quadrature points, two spatial discretization schemes are analyzed for the enrichedcontinuum. The proposed model reduction is also extended to the transient mass diffusion coupled to the mechanics with application to lithium-ion batteries. Chemical potential and strain fields formulation is used which allows the use of standard C0-continuous finite elements. The micro-scale problem, which usually involves an expensive solution of the coupled mass diffusionmechanics problem is now replaced by a set of ordinary differential equations through model reduction. Finally, an alternative model reduction approach using data-driven mechanics is explored. It relies on a direct search and interpolation from a database instead of the solution of a microscopic problem. The database is constructed and stored using the microscopic calculations in an offline stage. It also provides a route to extend the proposed model reduction method to the nonlinear regime
Köthe, Alexandra [Verfasser] y Anna [Akademischer Betreuer] Marciniak-Czochra. "Hysteresis-driven pattern formation in Reaction-diffusion-Ode models / Alexandra Köthe ; Betreuer: Anna Marciniak-Czochra". Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177809214/34.
Texto completoMarinelli, Alessio. "Fractional diffusion: biological models and nonlinear problems driven by the s-power of the Laplacian". Doctoral thesis, Università degli studi di Trento, 2016. https://hdl.handle.net/11572/368483.
Texto completoPagliarani, Stefano. "Portfolio optimization and option pricing under defaultable Lévy driven models". Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423519.
Texto completoIn questa tesi studiamo alcuni problemi di portfolio optimization e di option pricing in modelli di mercato dove le dinamiche di uno o più titoli rischiosi sono guidate da processi di Lévy. La tesi é divisa in quattro parti indipendenti. Nella prima parte studiamo il problema di ottimizzare un portafoglio, inteso come massimizzazione di un’utilità logaritmica della ricchezza finale e di un’utilità logaritmica del consumo, in un modello guidato da processi di Lévy e in presenza di fallimenti simultanei. Nella seconda parte introduciamo una nuova tecnica per il prezzaggio di opzioni europee soggette a fallimento, i cui titoli sottostanti seguono dinamiche che prima del fallimento sono rappresentate da processi di Lévy esponenziali. Nella terza parte sviluppiamo un nuovo metodo per ottenere espansioni analitiche per i prezzi di derivati europei, sotto modelli a volatilità stocastica e locale guidati da processi di Lévy, espandendo analiticamente l’operatore integro-differenziale associato al problema di prezzaggio. Nella quarta, e ultima parte, presentiamo un estensione della tecnica precedente che consente di ottenere espansioni analitiche per i prezzi di opzioni asiatiche, ovvero particolari tipi di opzioni il cui payoff dipende da tutta la traiettoria del titolo sottostante.
Sena, Elisa Thomé. "Um modelo de exclusão assimétrico para o transporte de partículas mediado por motores moleculares". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20052008-120606/.
Texto completoMolecular motors are proteins that transport objects such as vesicles, organelles and macromolecules along the cytoskeletum of cells. For physics, they are very interesting devices because they are able to generate work in an extremely viscous environment. Recently, many in vivo experiments have revealed that objects transported by molecular motors move bidirectionally along microtubules. Although the unidirectional movement of such molecular motors is experimentally and theoretically well characterized, the movement of particles transported by these motors is not well understood yet. However, this fenomenum is believed to be caused by the cooperativity of molecular motors. A great number of works are found in literature, which were formulated to describe the collective behaviour of many particles moving in a one-dimensional lattice with a preferred hop rate and exclusion. These models are known as TASEP (Totally asymmetric simple exclusion processes) or ASEP (Asymmetric simple exclusion processes) and are part of a class of models named _driven di_usive systems_. Although some authors made use of ASEP and TASEP models to describe the movement of molecular motors [37], [38], there is not yet, in this microscopic point of view, extensions of these models capable of incorporate particles which the dynamics depends exclusivaly from the presence of motors. In this work we propose a exclusion model developed to describe the joint movement of molecular motors and particles, generally called vesicles. In this model, vesicles do not have a proper dynamics, that is, they on the interaction with molecular motors to move. We look after analytical solutions of this model when there is only one vesicle moving on the lattice. We use a matrix formulation [32] to obtain the mean velocity of the vesicle and analyse its behaviour in situations of interest.
Engelbrecht, Adrian [Verfasser], Peter [Akademischer Betreuer] Buxmann y Alexander [Akademischer Betreuer] Kock. "Discovery and Diffusion of Digital Innovations – An Analysis of Enterprise Social Networks and Data-Driven Business Models / Adrian Engelbrecht ; Peter Buxmann, Alexander Kock". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1177241692/34.
Texto completoHerrenkind, Bernd, Alfred Benedikt Brendel, Ilja Nastjuk, Maike Greve y Lutz M. Kolbe. "Investigating end-user acceptance of autonomous electric buses to accelerate diffusion". Elsevier, 2019. https://publish.fid-move.qucosa.de/id/qucosa%3A75922.
Texto completoHui, Zi. "Spatial structure of complex network and diffusion dynamics". Thesis, Le Mans, 2013. http://www.theses.fr/2013LEMA1005/document.
Texto completoIn the recent development of network sciences, spatial constrained networks have become an object of extensive investigation. Spatial constrained networks are embedded in configuration space. Their structures and dynamics are influenced by spatial distance. This is proved by more and more empirical data on real Systems showing exponential or power laws spatial distance distribution of links. In this dissertation, we focus on the structure of spatial network with power law spatial distribution. Several mechanisms of structure formation and diffusion dynamics on these networks are considered. First we propose an evolutionary network constructed in the configuration space with a competing mechanism between the degree and the spatial distance preferences. This mechanism is described by a ki + (1 — a), where ki is the degree of node i and rni is the spatial distance between nodes n and i. By adjusting parameter a, the network can be made to change continuously from the spatial driven network (a = 0) to the scale-free network (a = 1). The topological structure of our model is compared to the empirical data from email network with good agreement. On this basis, we focus on the diffusion dynamics on spatial driven network (a = 0). The first model we used is frequently employed in the study of epidemie spreading : the spatial susceptible-infected-susceptible (SIS) model. Here the spreading rate between two connected nodes is inversely proportional to their spatial distance. The result shows that the effective spreading time increases with increasing a. The existence of generic epidemic threshold is observed, whose value dépends on parameter a. The maximum épidemic threshold and the minimum stationary ratio of infected nodes simultaneously locate in the interval 1.5 < a < 2. Since the spatial driven network has well defined spatial distance, this model offers an occasion to study the diffusion dynamics by using the usual techniques of statistical mechanics. First, considering the fact that the diffusion is anomalous in general due to the important long-range spreading, we introduce a composite diffusion coefficient which is the sum of the usual diffusion constant D of the Fick's laws applied over different possible transfer distances on the network. As expected, this composite coefficient decreases with increasing a and is a good measure of the efficiency of the diffusion. Our second approach to this anomalous diffusion is to calculate the mean square displacement (l²) to identify a diffusion constant D' and the degree of thé anomalousness y with the help of the power law {l²} = 4D'ty. D' behaviors in the same way as D, i.e., it decreases with increasing a. y is smaller than unity (subdiffusion) and tends to one (normal diffusion) as a increases
Boubehziz, Toufik. "Simulation en quasi temps réel d’une capsule sous écoulement grâce à des Modèles d’Ordre Réduit". Thesis, Compiègne, 2022. http://www.theses.fr/2022COMP2678.
Texto completoThe motion of a liquid-filled microcapsule flowing in a microchannel is a complex problem tosimulate. Two innovative reduced-order data-driven models are proposed to replace the Fluid Structure Interaction (FSI) model using a collected database from high-fidelity simulations. The objective is to replace the existing Full Order Model (FOM) with a fast-simulation model that can simulate the capsule deformation in flow at a low cost in terms of time and calculation. The first model consists in building from a space-time-parameter datacube a reduced model to simulate the deformation of the microcapsule for any admissible configuration of parameters. Time evolution of the capsule deformation is treated by identifying the nonlinear low-order manifold of the reduced variables. Then, manifold learning is applied using the Diffuse Approximation (DA) method to predict capsule deformation for a query configuration of parameters and a chosen time discretization. The second model is based on rewriting the FSI model under the form of a reduced-order dynamic system. In this latter, the spectral displacement and velocity coefficients are related through a dynamic operator to be identified. To determine this operator, we suggest the use of a dynamic mode decomposition approach. Numerical validations prove the reliability and stability of the two new models compared to the high order model. A software application has been developed to explore the capsule deformation evolution for any couple of admissible parameters
Cox, Robert William. "A Model for Stress-Driven Diffusion in Polymers". Thesis, 1988. https://thesis.library.caltech.edu/7429/14/Cox-rw-1988.pdf.
Texto completoPenetration of solvents into polymers is sometimes characterized by steep concentration gradients that move into the polymer and last for long times. The behavior of these fronts cannot be explained by standard diffusion equations, even with concentration dependent diffusion coefficients. The addition of stress terms to the diffusive flux can produce such progressive fronts. Model equations are proposed that include solvent flux due to stress gradients in addition to the Fickian flux. The stress in turn obeys an concentration dependent evolution equation.
The model equations are analyzed in the limit of small diffusivity for the problem of penetration into a semi-infinite medium. Provided that the coefficient functions obey certain monotonicity conditions, the solvent concentration profile is shown to have a steep front that progresses into the medium. A formula governing the progression of the front is developed. After the front decays away, the long time behavior of the solution is shown to be a similarity solution. Two techniques for approximating the solvent concentration and the front position are presented. The first approximation method is a series expansion; formulas are given for the initial speed and deceleration of the front. The second approximation method uses a portion of the long time similarity solution to represent the short time solution behind the front.
The addition of a convective term to the solvent flux is shown to raise the possibility of a traveling wave solution. The existence of the traveling wave solution is shown for certain types of coefficient functions. The way the initial front speed evolves onto the traveling wave speed is sketched out.
Kozák, Michal. "Bifurkace v matematických modelech v biologii". Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-321003.
Texto completoFolck, Anthony F. "A Cell-Based Model to Study Factors that Drive Diffuse Astrocytoma Development". Thesis, 2016. http://hdl.handle.net/1805/11053.
Texto completoSecondary gliomas are an incurable form of brain cancer that are diagnosed in people at a median age of 45 years. Next-generation sequencing has found that secondary glioblastomas have a distinct genetic profile from the more common primary glioblastomas, which are diagnosed in people typically over the age of 60. Over 80% of secondary gliomas contain an IDH1R132H mutation, resulting in neomorphic mutations, which catalyze isocitrate to the oncometabolite D-2-hydroxyglutarate (2-HG) instead of alpha-ketoglutarate (α-KG). As 2-HG accumulates, it induces a hypermethylator phenotype that prevents the cells from differentiating. Acquisition of additional mutations in tumor suppressors such as p53 and/or ATRX likely leads to tumor initiation. Work in the Wells Laboratory has found that loss of the HIPPO adaptor protein AmotL1 is also associated with increased malignancy. AmotL1 inhibits the transcriptional co-activator YAP to suppress both cell growth and migration. To understand the molecular events leading to secondary glioma development, this thesis developed a series of astrocyte cell lines that carry IDH1 and/or p53 mutations. These lines were then studied in 2D and 3D cell culture systems to identify changes that are associated with early secondary glial tumors. Work was also carried out to enable screens for small molecules that can be tested on these cell lines.
Engelbrecht, Adrian. "Discovery and Diffusion of Digital Innovations – An Analysis of Enterprise Social Networks and Data-Driven Business Models". Phd thesis, 2019. https://tuprints.ulb.tu-darmstadt.de/8404/1/Engelbrecht%20-%20Discovery%20and%20Diffusion%20of%20Digital%20Innovations%20-%20V1.1.pdf.
Texto completoMatookchund, Navin Gazanchand. "Performance appraisal as driver of individual innovation within and across organisations". Thesis, 2019. http://hdl.handle.net/10500/25931.
Texto completoLiterature suggests that human resource practices (HRPs), particularly performance appraisal (PA), contribute to innovation. However, the importance of PA amongst other antecedents to innovation is inadequately described. This leaves human resource managers (HRMs) in the dark on which HRPs they should emphasize. This study contextualises the PA-innovation relationship in South Africa and specifies the importance of PA as a driver of innovation within and across organisations. A cross-sectional survey was employed, acquiring data from a broad cross-section of South African employees and organisations. PA, HRPs and three other antecedents to innovation, and innovation itself, were measured. Across organisations, PA was directly responsible for between 3.8% and 5.7% of the variance in innovation. It was also found that, when PA was combined with other HRPs and other antecedents to innovation, the role of PA was significant, though mostly secondary. Within organisations, the pattern repeated itself with the PAinnovation relationship significant in 30% of organisations, with PA never the dominant driver of innovation in any organisation. The research thus revealed that PA, as an antecedent to innovation, plays a subordinate role, both across employees and within specific organisations. When testing more complex models on the PA-innovation link, the results revealed that the PA-innovation relationship is mediated by work engagement (WE) as well as affective commitment (AC), with WE having the greatest effect. Transformational leadership (TL) and corporate entrepreneurship (CE) moderate the PA-innovation relationship, with TL having the strongest effect and CE having almost no effect. Proactive personality does not moderate the PA-innovation relationship. The results specify the relative importance of PA in general and within specific organisations. The main finding is that PA is not the dominant HRP driving innovation. It also shows that leadership behaviour (TL) more than climate (CE), and WE rather than AC influence the PA innovation relationship. The aforementioned will benefit all stakeholders, particularly HRMs, to focus on appropriate HRPs when trying to enhance innovation at the general employee and organisational level. No previous research has discussed the role of PA as an antecedent to innovation in this degree of detail or contextualised the research as has been done here.
Literatuur suggereer dat menslike hulpbronpraktyke, veral prestasiebeoordeling, bydra tot innovasie. Die belangrikheid van prestasiebeoordeling onder ander antesedente vir innovasie word egter onvoldoende beskryf. Dit laat menslikehulpbronbestuurders in die duister waarop menslike hulpbronpraktyke hulle moet beklemtoon. Hierdie studie kontekstualiseer die prestasiebeoordeling-innovasie-verhouding in Suid-Afrika en spesifiseer die belangrikheid van prestasiebeoordeling as 'n drywer van innovasie binne en oor organisasies. Daar is gebruik gemaak van 'n deursnee-opname met die verkryging van data van 'n breë deursnit van Suid-Afrikaanse werknemers en organisasies. Prestasiebeoordeling, menslike hulpbronpraktyke en drie ander voorvaders vir innovasie en innovasie self is gemeet. Regoor organisasies was prestasiebeoordeling regstreeks verantwoordelik vir tussen 3.8% en 5.7% van die variansie in innovasie. Daar is ook gevind dat, toe prestasiebeoordeling gekombineer is met ander menslike hulpbronpraktyke en ander antesedente vir innovasie, die rol van prestasiebeoordeling belangrik was, hoewel meestal sekondêr. Binne organisasies het die patroon homself herhaal met die prestasiebeoordeling-innovasie-verhouding wat in 30% van die organisasies beduidend was, met prestasiebeoordeling nooit die dominante drywer van innovasie in enige organisasie nie. Die navorsing het dus aan die lig gebring dat prestasiebeoordeling, as 'n voorvader van innovasie, 'n ondergeskikte rol speel, beide oor werknemers en binne spesifieke organisasies. By die toetsing van meer ingewikkelde modelle op die prestasiebeoordeling-innovasie-skakel, het die resultate aan die lig gebring dat die prestasiebeoordeling-innovasie-verhouding bemiddel word deur werksbetrokkenheid sowel as affektiewe toewyding, met die feit dat werksbetrokkenheid die grootste effek het. Transformasionele leierskap en korporatiewe ondernemerskap het die prestasiebeoordeling-innovasie-verhouding gematig, en Transformasionele leierskap het die sterkste effek en korporatiewe ondernemerskap het byna geen effek nie. Proaktiewe persoonlikheid modereer nie die prestasiebeoordeling-innovasie-verhouding nie. Die resultate spesifiseer die relatiewe belang van prestasiebeoordeling in die algemeen en binne spesifieke organisasies. Die belangrikste bevinding is dat prestasiebeoordeling nie die dominante menslike hulpbronpraktyk is wat innovasie dryf nie. Dit wys ook dat leierskapsgedrag meer as klimaat is, en werksbetrokkenheid eerder as affektiewe toewyding die binnovasieverhouding beïnvloed. Bogenoemde sal alle belanghebbendes, veral menslikehulpbronbestuurders, bevoordeel om op toepaslike menslike hulpbronpraktyke te konsentreer as hulle probeer om innovasie op die algemene werknemer- en organisatoriese vlak te bevorder. Geen vorige navorsing het die rol van prestasiebeoordeling as 'n voorkennis vir innovasie in hierdie mate van detail bespreek of die navorsing gekontekstualiseer soos hier gedoen is nie.
Izincwadi zisikisela ukuthi imikhuba yemithombo yabantu, ikakhulu ukutuswa ngomsebenzi, kwenza abantu basungule izinto. Nokho, ukubaluleka kwe-ukutuswa ngomsebenzi phakathi kwezinye izinto kudlula ukusungula izinto okuchazwe ngokungenelea. Lokhu kwenza abaphathi bemithombo yabantu besebumnyameni ngokuthi imaphi ama-imikhuba yemithombo yabantu okufanele bawagcizelele. Lolu cwaningo luhlobanisa ukusungulwa kwezinto ze-ukutuswa ngomsebenzi nobuhlobo eNingizimu Afrika futhi ikhuthaze ngokukhethekile ukubaluleka kweukutuswa ngomsebenzi njengokushukumisa abantu ukuba basungule ngaphakathi nakuzo zonke izinhlangano. Kwasetshenziswa inhlolo-vo kuzo zonke izinhlangano, kwaqoqwa idatha kuzo zonke izingxenye zabasebenzi baseNingizimu Afrika nezinhlangano. I-ukutuswa ngomsebenzi, ama-imikhuba yemithombo yabantu nabanye abasunguli abathathu bezinto, nokusungulwa kwezinto ngokwako kwakalwa. Kuzo zonke izinhlangano, i-ukutuswa ngomsebenzi yayinomthwalo ngokuqondile phakathi kwamaphesenti angu-3.8 no-5.7% zokusungula izinto okuhlukahlukene. Kwatholakala nokuthi, lapho i-ukutuswa ngomsebenzi ihlanganiswa namanye ama-imikhuba yemithombo yabantu nezinye izinhlangano ezisungula izinto, indima ye-ukutuswa ngomsebenzi yayibalulekile, nakuba ingeyesibili. Phakathi nezinhlangano, umkhuba wawuziphindaphinda ekusunguleni kwe-ukutuswa ngomsebenzi nobuhlobo nezinhlangano ezingamaphesenti angu-30, i-ukutuswa ngomsebenzi yayingashukumisi ukusungula izinto kunoma iyiphi inhlangano. Ngakho, ucwaningo lwembula ukuthi i-ukutuswa ngomsebenzi, njengento esungulayo, inendima ebalulekile, kokubili kubasebenzi nasezinhlanganweni ezithile. Lapho kuhlolwa izimo eziyinkimbinkimbi kakhulu ekuhlobaneni nokusungula kwe-ukutuswa ngomsebenzi, imiphumela yembula ukuthi ukusungula kwe-ukutuswa ngomsebenzi kuhlobene nokusebenza kanye nokuzibophezela okuphumelelayo, i-kuhlobene nokusebenza inomthelela omkhulu kakhulu. Abaholi bezinguquko nabaphathi bezinkampani bayakulinganisa ubuhlobo bokusungula ne-ukutuswa ngomsebenzi, i-abaholi bezinguquko inomthelela omkhulu kakhulu futhi i-nabaphathi bezinkampani ingenawo umthelela. Ubuntu obuhle abulinganiseli ubuhlobo bokusungula kwe-ukutuswa ngomsebenzi. Imiphumela ibonisa ukubaluleka kwe-ukutuswa ngomsebenzi phakathi ezinhlanganweni ezithile. Okwatholakala ukuthi i-ukutuswa ngomsebenzi ayiyona into eyinhloko eshukumisa ukusungula kwe-imikhuba yemithombo yabantu. Ibuye ibonise ukuziphatha kwabaholi ngaphezu kwesimo sezulu, ne-kuhlobene nokusebenza kunethonya le-nokuzibophezela okuphumelelayo ebuhlotsheni bokusungula kwe-ukutuswa ngomsebenzi. Lokho okuphawulwe ngenhla kuyozuzisa wonke ama-stakeholder, ikakhulu ama-abaphathi bemithombo yabantu, ukuze agxile kuma-imikhuba yemithombo yabantu afanele lapho ezama ukukhuthaza abasebenzi abavamile nezinhlangano ukuba basungule. Alukho ucwaningo lwangaphambili oluke lwaxoxa ngendima ye-ukutuswa ngomsebenzi njengesungula izinto kuleli zinga elinemininingwane noma ibeke ucwaningo ngokunembile njengoba kwenziwe lapha.
Business Management
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