Дисертації з теми "Dynamic influence model"
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Sakaguchi, K., X. Zeng, LR Leung, and P. Shao. "Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4)." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/624742.
Повний текст джерелаHsiao, Elizabeth T. "A dynamic model to study the influence of alpine ski boot characteristics on heel retention force /." Online version of thesis, 1994. http://hdl.handle.net/1850/11784.
Повний текст джерелаAbe, Steffen. "Investigation of the influence of different micro-physics on the dynamic behaviour of faults using the lattice solid model /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16551.pdf.
Повний текст джерелаErtugrul, Ozgur Lutfi. "Influence Of Deformable Geofoam Bufers On The Static And Dynamic Behaviors Of Cantilever Retaining Walls." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613734/index.pdf.
Повний текст джерелаRAIMUNDO, JULIANA DE MATOS PONTE. "INFLUENCE OF THE NONLINEAR FLEXURAL AND SWAY INTERACTION ON THE STATIC AND DYNAMIC INSTABILITY OF A CONCEPTUAL MODEL OF COLUMN." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35769@1.
Повний текст джерелаCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
A estabilidade das colunas de um pórtico plano depende da importância relativa da rigidez à flexão e rigidez lateral de cada coluna e elementos adjacentes. Um exemplo típico é a maior capacidade de carga de pórticos planos com restrição lateral em comparação com pórticos semelhantes, sem restrição lateral. Também esta restrição tem uma influência importante na resposta pós-crítica e na sensibilidade à imperfeição da estrutura. A carga de flambagem pode ser dominada pela rigidez à flexão da coluna ou pela rigidez das restrições laterais. Dependendo dos valores relativos desses parâmetros, pode ocorrer interação modal. Nesse caso, podem surgir vários caminhos pós-críticos, acoplados e desacoplados, levando a uma topologia complexa da energia potencial total com vários pontos críticos (máximos, mínimos e selas). Os caminhos pós-críticos instáveis influenciam na sua capacidade de carga e na sensibilidade da estrutura a imperfeições. Isso leva a um complexo comportamento dinâmico não linear da estrutura carregada axialmente. No presente trabalho, um modelo conceitual de dois graus de liberdade de um elemento de pórtico plano sob compressão é estudado. Uma análise detalhada é realizada a fim de estudar como a rigidez lateral influencia: os comportamentos pré- e pós-crítico, a instabilidade paramétrica do modelo sob uma excitação harmônica axial e o comportamento ressonante do sistema estrutural carregado axialmente sob uma excitação de base; contribuindo para uma melhor compreensão da resposta não linear desta classe de estruturas. A análise das bifurcações mostra que a estrutura pode exibir várias soluções estáveis e instáveis coexistentes, levando a bacias de atração entrelaçadas, cuja topologia controla a integridade dinâmica da estrutura em um ambiente dinâmico. Para estudar o comportamento não linear do modelo, foram utilizadas várias estratégias numéricas para obter os caminhos de equilíbrio não lineares, pontos fixos estáveis e instáveis, diagramas de bifurcação e bacias de atração.
The stability of columns in a portal frame depends on the relative importance of the flexural and lateral stiffness of the column and connected elements. A typical example is the higher load capacity of non-sway frames as compared with that of similar frames with no lateral restrain. Also this restrain has an important influence on the post-critical response and imperfection sensitivity of the structure. The buckling load may be either dominated by the flexural stiffness of the columns or by the stiffness of the lateral restrains. Depending on the relative values of these parameters, interactive buckling may occur. In such case, several coupled and uncoupled post-buckling paths may arise, leading to a complex topology of the energy landscape with several critical points (maxima, minima and saddles). The resulting unstable post-buckling paths influence the structure s imperfection sensitivity and load carrying capacity of the structure. This leads to an involved nonlinear dynamic behaviour of the axially loaded structure. In the present work, a conceptual two-degree-of-freedom model of a plane-frame column is studied. A detailed analysis is conducted to study how the lateral stiffness influences the static buckling and post-buckling behavior, the parametric instability of the model under under axial harmonic excitation and the resonant behavior of the axially loaded structural system under base excitation, contributing to a better understanding of the nonlinear response of this class of structures. The bifurcation analysis shows that the structure may display several coexisting stable and unstable solutions, leading to intertwining basins of attraction, whose topology controls the dynamic integrity of the structure in a dynamic environment. To study the non-linear behavior of the model, several numerical strategies were used to obtain the nonlinear equilibrium paths, stable and unstable fixed points, bifurcation diagrams and basins of attraction.
Sanroman, Cervero Claudia. "The influence of torsional resistance of the deck on the dynamic response of a high-speed railway bridge : Case study: Ulla River Viaduct." Thesis, KTH, Bro- och stålbyggnad, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210558.
Повний текст джерелаNass, Ole. "Optimizing Online Marketing Efficiency By Analyzing the Mutual Influence of Online Marketing Channels with Respect to Different Devices." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/122296.
Повний текст джерела[CAT] Com és l'atribució en un entorn de omnicanal? Es pot determinar una distinció important en contrast amb l'atribució en un entorn multicanal. A més de proporcionar el procés d'anàlisi de màrqueting, una especificació del procés estàndard intersectorial per a la mineria de dades (CRISP¿DM), s'utilitza un enfocament de mètode mixt seqüencial per analitzar la qüestió principal de la investigació. En el primer pas d'aquesta investigació s'analitzen les característiques i els requisits d'atribució eficient en un entorn omnicanal. A partir d'entrevistes semiestructurades amb experts i d'un procés de recerca bibliogràfica holística estructurada, s'identifica clarament la falta d'un enfocament d'atribució omnicanal. Els enfocaments d'atribució existents s'identifiquen mitjançant la realització d'un procés estructurat de revisió de la literatura. Aquests enfocaments identificats s'avaluen aplicant els resultats de les entrevistes semiestructurades amb experts, és a dir, els requisits i característiques d'una atribució omnicanal eficient. Cap dels enfocaments d'atribució identificats compleix amb la majoria dels requisits de omnicanal analitzats. En tenir la bretxa de recerca ¿ la manca d'un enfocament d'atribució de omnicanales ¿ clarament identificada, es desenvolupa un enfocament d'atribució de omnicanales a la segona part d'aquesta investigació presentada. Utilitzant la metodologia MAP, la principal llacuna de recerca s'omple proporcionant el Holistic Customer Journey (HCJ): una base de dades a punt per al omni¿canal i un enfocament d'atribució de omni¿canal corresponent. Entre altres coses, l'enfocament d'atribució desenvolupat consisteix en una classificació d'aprenentatge automàtic. Aquesta investigació presentada és la primera a utilitzar informació de gairebé 240.000.000 de conjunts de dades d'interacció, que contenen informació entre dispositius i entre plataformes. Totes les fonts de dades subjacents són proporcionades per una de les plataformes immobiliàries més grans d'Alemanya.
[EN] What does attribution in an omni¿channel environment look like? A major distinction can be determined in contrast to attribution in a multi¿channel environment. Besides providing the Marketing Analytics Process, a specification of the Cross¿industry standard process for data mining (CRISP¿DM), a sequential mixed method approach is utilized to analyze the main research question. Within the first step of this presented research characteristics, and requirements of efficient attribution in an omni¿channel environment are analyzed. Based on semi¿structured expert interviews and a holistic structured literature research process, the lack of an omni¿channel attribution approach is clearly identified. Existing attribution approaches are identified by conducting the structured literature review process. Those identified approaches are evaluated by applying the results of the semi¿structured expert interviews - the requirements and characteristics of efficient omni¿channel attribution. None of the identified attribution approaches fulfill a majority of the analyzed omni¿channel requirements. By having the research gap - the lack of an omni¿channel attribution approach - clearly identifed, an omni¿channel attribution approach is developed in the second part of this presented research. Utilizing the MAP methodology, the main research gap is filled by providing the Holistic Customer Journey (HCJ): an omni¿channel ready data foundation and a corresponding omni¿channel attribution approach. Among other things the developed attribution approach consists of a machine learning classification. This presented research is the first to utilize information from almost 240.000.000 interaction data sets, containing crossdevice and cross¿platform information. All underlying data sources are provided by one of Germany's largest real¿estate platforms.
Nass, O. (2019). Optimizing Online Marketing Efficiency By Analyzing the Mutual Influence of Online Marketing Channels with Respect to Different Devices [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/122296
TESIS
Ragueneau, Frédéric. "Fonctionnement dynamique des structures en béton : influence des comportements hystériques locaux." Cachan, Ecole normale supérieure, 1999. http://www.theses.fr/1999DENS0001.
Повний текст джерелаBouchard, Marcel. "Common Crowd Dynamics: Shaping Behavioral Intention Models." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/723.
Повний текст джерелаKucharski, Adam. "The dynamics of immunity to seasonal influenza." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607908.
Повний текст джерелаNi, Lihong, and 倪莉紅. "Modeling vaccination for pandemic influenza: implication of the race between pandemic dynamics and vaccineproduction." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B40687430.
Повний текст джерелаLiu, Jianqiu. "Parametric Model for Assessing Factors that Influence Highway Bridge Service Life." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/37393.
Повний текст джерелаPh. D.
Witt, Stephen. "The Influence of Under Sleeper Pads on Railway Track Dynamics." Thesis, Linköping University, Department of Management and Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12232.
Повний текст джерелаIn this work the influence of Under Sleeper Pads on the dynamic forces on a railway track is investigated. A special interest is devoted to the effect of using Under Sleeper Pads in a railway track with changing vertical stiffness. The contact force between wheel and rail and the ballast contact forces are examined. For the investigation a finite element model with the length of thirty sleepers is created and calculations are performed with the software LS-DYNA. Three different cases of varying vertical track stiffness are studied: the transition from an embankment to a bridge, a randomly varying track stiffness along the railway track and hanging sleepers.
Wittebolle, Guy. "Influence des basses temperatures racinaires sur la croissance, le regime hydrique et la repartition des assimilats chez le dactyle (dactylis glomerata l. )." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13028.
Повний текст джерелаDubois, Florent. "Dynamic models of segregation." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0313.
Повний текст джерелаThis thesis studies the causes and consequences of the residential segregation process in the post-Apartheid South Africa.Inside this general issue, we are interested in several aspects still debated in the literature on residential segregation. Thefirst concerns the impact of individuals’ preferences for the racial composition of their neighborhood on the segregationlevels. The second question deals with the impact of residential segregation on the income levels of each racial group. Thelast issue is related to quantifying the different causes of segregation.Three chapters constitute this thesis. In the first chapter, we reconcile the theoretical literature on the impact of preferencesfor the racial composition of the neighborhood with the empirical evidences of declining levels of segregation in theUnited-States and South Africa. We argue that if individuals internalize the economic and social life that a new entrantbrings with him, then integrated neighborhoods can emerge. This effect is empirically stronger than homophilly andracism. In the second chapter, we study the impact of residential segregation on the whole income distribution. We showthat residential segregation has a positif effect on top incomes for Whites, whereas it has a negatif effect for Blacks at thebottom of the distribution. The effect of residential segregation is even more important than the effect of education inmost cases. In the third chapter, we quantify the impact of each determinant of segregation. We find that the lackof access to basic public services is the main determinant, whereas differences in sociodemographics only account for asmall part in the most segregated areas
Asavathiratham, Chalee. "The influence model : a tractable representation for the dynamics of networked Markov chains." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/33546.
Повний текст джерелаIncludes bibliographical references (p. 186-188).
In this thesis we introduce and analyze the influence model, a particular but tractable mathematical representation of random, dynamical interactions on networks. Specifically, an influence model consists of a network of nodes, each with a status that evolves over time. The evolution of the status at a node is according to an internal Markov chain, but with transition probabilities that depend not only on the current status of that node, but also on the statuses of the neighboring nodes. Thus, interactions among the nodes occur probabilistically, starting when a change of status at one node alters the transition probabilities of its neighbors, which then alter those of their neighbors, and so on. More technically, the influence model is a discrete-time Markov process whose state space is the tensor product of the statuses of all the local Markov chains. We show that certain aspects of the dynamics of the influence model can be studied through the influence matrix, a reduced-order matrix whose dimension is the sum rather than the product of the local chain dimensions. We explore the eigenstructure of the influence matrix and explicitly describe how it is related to that of the full-order transition matrix. From the influence matrix, we also obtain the influence graph, which allows the recurrent states of the influence model to be found by graph-theoretic analysis on the reduced-order graph. A nested hierarchy of higher-order influence matrices, obtained from Kronecker powers of the first-order influence matrix, is exposed. Calculations on these matrices allow us to obtain progressively more elaborate statistics of the model at the expense of progressively greater computational burden. As a particular application of the influence model, we analyze the "to link or not to link" dilemma. Suppose that a node is either in a 'healthy' or 'failed' status. Given that connecting to the network makes its status dependent on those of its neighbors, is it worthwhile for a node to connect to the network at all? If so, which nodes should it connect to in order to maximize the 'healthy' time? We formulate these questions in the framework of the influence model, and obtain answers within this framework. Finally, we outline potential areas for future research.
by Chalee Asavathiratham.
Ph.D.
Schmitt, Gregor R. "Examining the CEO-Owner Dyad: A Dynamic Model of Interrelationship Influences on Innovation Capability." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17395.
Повний текст джерелаMcLaren, Alison Jane. "The influence of ocean dynamics on the air-sea flux of carbon dioxide and nutrient transport." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367190.
Повний текст джерелаMcClanahan, Kegan N. "Carbon Cycling Dynamics Inferred from Carbon Isotope Sourcing in a Mid-Latitude Karst-Influenced River." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1393.
Повний текст джерелаMense, Jelte Pierc. "New general mechanistic model for predicting civil disturbances and their characteristics." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28763.
Повний текст джерелаZohora, Fatematuz. "Study of pipe leak fluid dynamic characteristics and their influences on acoustic emission generation." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/207823/1/Fatematuz_Zohora_Thesis.pdf.
Повний текст джерелаXi, Jinxiang. "Seal inlet disturbance boundary conditions for rotordynamic models and influence of some off-design conditions on labyrinth rotordynamic instability." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4971.
Повний текст джерелаHörberg, Thomas. "Influences of Form and Function on Spatial Relations : Establishing functional and geometric influences on projective prepositions in Swedish." Thesis, Stockholm University, Department of Linguistics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6867.
Повний текст джерелаThe present work is concerned with projective prepositions, which express the relation between two objects by referring to a direction in three-dimensional space. The projective prepositions have been regarded as expressing simple schematic relations of a geometric nature. A theory of the apprehension of projective relations can account for their meanings when they express strictly geometric relations. However, many studies have shown that the appropriateness of the prepositions also depends on the functional relation between the objects and that a number of functional factors influence the comprehension of English prepositions. This experimental study investigates if the acceptability of the Swedish prepositions över, under, ovanför and nedanför are influenced by functional factors as well, and whether acceptability judgments about över and under are more sensitive to functional influences than judgments about ovanför and nedanför, as has been shown for the corresponding English prepositions over and under, and above and below, respectively. It also investigates how the shapes and the parts of the related objects influence their functional interaction, and how the acceptability of the prepositions is in consequence influenced by the shapes of the objects. It was found that the theory of apprehension can indeed account for the acceptability of the prepositions when the relation between the objects is strictly geometric. It was further found that acceptability judgments about them are influenced by functional factors in a similar manner to the corresponding English prepositions when the objects are functionally related, although judgments about under and nedanför are not differentially influenced by these factors. Furthermore, the shapes and the parts of both of the related objects influence acceptability judgments about the prepositions in predictable manners. An extension of the theory of apprehension is suggested which can account for the functional influences indicated in the present study.
Preikshot, David B. "The influence of geographic scale, climate and trophic dynamics upon North Pacific oceanic ecosystem models." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31048.
Повний текст джерелаScience, Faculty of
Resources, Environment and Sustainability (IRES), Institute for
Graduate
Pika, Philip. "Exploring the regional and global patterns in organic matter reactivity and its influence on benthic biogeochemical dynamics." Doctoral thesis, Universite Libre de Bruxelles, 2020. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/305204.
Повний текст джерелаLes sédiments marins sont un élément clé du cycle mondial du carbone et du système climatique. Ils abritent l’un des plus grands réservoirs de carbone sur Terre, fournissent le seul puits à long terme pour le CO2 atmosphérique, recyclent les nutriments et constituent les archives climatiques les plus importantes. Les processus de la diagénèse précoce dans les sédiments marins sont donc au cœur de notre compréhension des cycles et du climat biogéochimiques passés, présents et futurs. Étant donné que tous les processus diagénétiques précoces peuvent être directement ou indirectement liés à la dégradation de la matière organique (MO), faire progresser cette compréhension nécessite de démêler les différents facteurs qui contrôlent le devenir de la MO (sédimentation, dégradation et enfouissement) à différentes échelles spatiales et temporelles. En général, la dégradation hétérotrophique de la MO dans les sédiments marins est contrôlée par la quantité et, en particulier, la réactivité apparente de la MO qui se dépose sur les sédiments marins. Bien que les contrôles potentiels ((micro) biologiques, chimiques et physiques) de la réactivité de la MO soient de mieux en mieux compris, leur importance relative reste difficile à quantifier. Traditionnellement, des approches de modèle de données intégrées sont utilisées pour quantifier la réactivité apparente de la MO (c’est-à-dire les constantes de vitesse de dégradation de la MO) sur des sites de forage bien étudiés. Ces approches reposent sur des modèles de réaction-transport (RTM) qui tiennent généralement compte des processus de transport (advection, diffusion moléculaire, bioturbation et bio-irrigation) et de réaction (production, consommation, équilibre), mais leur complexité varie. La réactivité apparente de la MO est généralement considérée comme un paramètre libre qui est utilisé pour ajuster les profils de profondeur, les taux de réaction ou les flux d’échange benthique-pélagique observés. À l’heure actuelle, aucun cadre quantitatif n’existe pour prédire la réactivité apparente de la MO dans les zones où aucun ensemble complet de données benthiques n’est disponible.Pour évaluer l’impact de ce manque de connaissance, nous avons exploré la sensibilité des taux de réaction biogéochimiques benthiques, ainsi que des flux d’échange benthique-pélagique aux variations de la réactivité apparente de la MO (c.-à-d. les paramètres du modèle de con- tinuum réactif a et ν) au moyen d’un modèle diagénétique numérique complexe appliqué aux zones de dépôts sur les plateaux, les talus et en haute mer. Les résultats du modèle montrent que la réactivité apparente de la MO exerce un contrôle dominant sur l’ampleur des taux de réaction biogéochimiques et des flux d’échange benthique-pélagique dans différents environ- nements. L’absence d’un cadre général pour quantifier la réactivité de la MO complique donc la paramétrisation des modèles diagénétiques à l’échelle régionale et mondiale et, ainsi, compromet notre capacité à quantifier le couplage benthique-pélagique global en général et la dynamique de dégradation de la MO en particulier.Pour tendre à meilleure connaissance systématique et quantitative de la réactivité de la MO, la réactivité apparente OM (c.-à-d. les paramètres du modèle de continuum réactif a et ν) est quantifiée par modélisation inverse des profils de sédiments organiques de carbone, de sulfate (et de méthane), ainsi que localisation de la zone de transition sulfate-méthane à l’aide d’un modèle diagénétique numérique complexe pour 14 sites individuels à travers différents environnements de dépôt. Les résultats du modèle mettent à nouveau en évidence le contrôle dominant de la réactivité de l’OM sur les taux de réaction biogéochimiques et les flux d’échanges benthiques. De plus, les résultats montrent que les valeurs déterminées inversement déterminées se situent dans une plage étroite (0,1 <ν<0,2). En revanche, les valeurs déterminées s’étendent sur dix ordres de grandeur (1 ·10−3 <ν< 1·107) et sont donc le principal moteur de la variabilité globale de la réactivité OM. L’exploration de ces tendances dans leur contexte environnemental révèle que la réactivité apparente de l’OM est déterminée par un ensemble dynamique de contrôles environnementaux plutôt que par des contrôles environnementaux uniques traditionnellement proposés (par exemple, la profondeur de l’eau, le taux de sédimentation, les flux OM). Cependant, la forte demande de calcul associée à une telle approche de modèle inverse multi-espèces, ainsi que la disponibilité limitée de données complètes sur l’eau interstitielle, limitent le nombre d’estimations apparentes de la réactivité OM. Par conséquent, tout en fournissant des amorces importantes pour une quantification de la réactivité de l’OM à l’échelle mondiale, les résultats du modèle inverse sont loin de fournir un cadre prédictif.Pour surmonter les limites de calcul et étendre la modélisation inverse de la réactivité apparente de l’OM à l’échelle mondiale, le modèle analytique OMEN-SED est étendu en intégrant une approximation nG du modèle de continuum réactif qui est pleinement cohérente avec la structure générale d’OMEN-SED. La nouvelle version OMEN-SED-RCM fournit ainsi l’efficacité de calcul requise pour la détermination inverse de la réactivité apparente de l’OM (c’est-à-dire les paramètres du modèle de continuum réactif a et ν) à l’échelle mondiale. Les capacités du nouveau modèle OMEN-SED-RCM à capturer les modèles locaux et globaux de dynamique diagénétique observés sont rigoureusement testés par les données du modèle, ainsi que la comparaison modèle- modèle.OMEN-SED-RCM est ensuite utilisé pour déterminer inversement la réactivité apparente de l’OM par modélisation inverse de 394 mesures individuelles du taux d’utilisation de l’oxygène dissous (DOU). Le DOU est couramment utilisé comme indicateur de la réactivité de l’OM, il est plus largement disponible que les ensembles de données exhaustifs sur l’eau interstitielle et les cartes benthiques mondiales/régionales des taux d’utilisation de l’oxygène dissous (DOU) ont été dérivées sur la base de l’ensemble de données DOU croissant. Le test de sensibilité montre que, bien que la modélisation inverse des taux de DOU ne fournisse pas une estimation robuste du paramètre RCM ν, c’est un bon indicateur pour le paramètre RCM a. Sur la base des résultats précédents, le paramètre ν a donc été supposé être globalement constant. Les valeurs a déterminées à l’inverse varient selon l’ordre de grandeur, de a = 0,6 an dans la région polaire sud à a = 5, 6 · 106 dans le Pacifique sud oligotrophique central. Malgré une forte hétérogénéité intra et interrégionale dans la réactivité apparente de la MO benthique, un certain nombre de schémas régionaux clairs qui correspondent largement aux observations précédentes émergent. Des réactivités apparentes élevées de l’OM sont généralement observées dans les régions dominées par des sources marines de MO et caractérisées par un naufrage efficace de l’OM et une dégradation limitée pendant le naufrage. En revanche, les réactivités MO apparentes les plus faibles sont observées pour les régions caractérisées par de faibles taux de production primaire marine, en combinaison avec une grande distance du plateau continental et de la pente, ainsi que des colonnes d’eau profonde. Pourtant, les résultats mettent également en évidence l’importance des processus de transport latéral pour la réactivité apparente de l’OM.En particulier, les sédiments des mers profondes au voisinage d’environnements de marge continentale dynamiques ou sous l’influence de forts courants océaniques peuvent recevoir des apports OM de réactivité comparable provenant d’environnements plus productifs et, ainsi, révéler des réactivités OM plus élevées que ce qui était traditionnellement prévu. Enfin, sur la base du lien fort observé entre la réactivité apparente de l’OM (c’est-à-dire le paramètre RCM a) et le taux DOU, une fonction de transfert qui prédit l’ordre de grandeur du paramètre RCM a en fonction de DOU est utilisée pour dériver, pour nos connaissances, la première carte mondiale de la réactivité apparente de l’OM. Les résultats du modèle des flux et des taux régionaux et mondiaux se situent bien dans la gamme des valeurs observées et également d’accord avec les tendances générales observées au niveau mondial. Les résultats mettent également en évidence le rôle de l’océan profond pour le cycle benthique-pélagique et indiquent une grande variabilité régionale du cycle benthique à grande profondeur. Il s’agit d’une première étape vers une estimation mondiale plus précise du cycle biogéochimique benthique qui tient compte de l’hétérogénéité mondiale du milieu marin. Cet aspect est essentiel pour améliorer notre compréhension des rétroactions benthiques sur le couplage benthique-pélagique et sur le système carbone-climat, qui peuvent ensuite être incorporées aux processus benthiques dans les modèles du système terrestre.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Kocáb, Dalibor. "Experimentální stanovení faktorů ovlivňujících statický modul pružnosti betonu s využitím nedestruktivních zkušebních metod." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-355639.
Повний текст джерелаMichael, Taylor. "Invertebrate Activities in Wetland Sediments Influence Oxygen and Nutrient Dynamics at the Sediment-water Interface." Kent State University Honors College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1525568331200468.
Повний текст джерелаSungat, Ayan. "The influence of foreign ownership on cluster evolution: the case of the Stockholm – Uppsala life science cluster." Thesis, KTH, Samhällsekonomi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118851.
Повний текст джерелаNasachenko, M. "Modeling the influence of monetary policy on real sector using system dynamics methodology: case of Ukraine." Thesis, Sumy State University, 2019. https://essuir.sumdu.edu.ua/handle/123456789/77621.
Повний текст джерелаWright, Abigail. "Developing a dynamic model of metacognitive influences on anomalous experiences and functional outcome in young people with and without psychosis." Thesis, University of Sussex, 2019. http://sro.sussex.ac.uk/id/eprint/81223/.
Повний текст джерелаKolgushev, Oleg. "Influence of Underlying Random Walk Types in Population Models on Resulting Social Network Types and Epidemiological Dynamics." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955128/.
Повний текст джерелаBarrett, Matthew [Verfasser], Matthias [Gutachter] Ballauff, Judith [Gutachter] Peters, and Rheinhard [Gutachter] Lipowsky. "Structure and dynamics of model lipid membranes : the influence of amyloid-beta peptide fragments on model membranes / Matthew Barrett. Gutachter: Matthias Ballauff ; Judith Peters ; Rheinhard Lipowsky." Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://d-nb.info/1105526194/34.
Повний текст джерелаSilva, Emily Ane Dionizio da. "Influence of climate, fire and phosphorus in the dynamics of vegetation in the Amazon-Cerrado border simulated with INLAND model." Universidade Federal de Viçosa, 2015. http://www.locus.ufv.br/handle/123456789/6659.
Повний текст джерелаMade available in DSpace on 2015-11-12T13:54:30Z (GMT). No. of bitstreams: 1 texto completo.pdf: 3255421 bytes, checksum: 6de68334c72c21814bfee6694093753e (MD5) Previous issue date: 2015-02-12
Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Estudos realizados para avaliar os principais fatores responsáveis pela dinâmica da vegetação na Amazônia tais como clima e/ou desmatamento sugerem a possibilidade da floresta Amazônica não resistir a uma eventual mudança do regime de chuvas, e ser transformada em um ecossistema de vegetação mais esparsa, do tipo savana, o que deu origem ao termo “Savanização da Amazônia”. Parte destes estudos iniciais no entanto utilizavam apenas cenários de climas futuros, negligenciando na maior parte das vezes o efeito do fogo, e principalmente o efeito da limitação nutricional na dinâmica da vegetação. Recentemente, no âmbito da modelagem climática, grandes avanços têm sido realizados na tentativa de se construir modelos que incorporem o efeito da limitação nutricional e do fogo de forma que se possa avaliar e dimensionar os efeitos dos mesmos na vegetação em larga escala. Neste trabalho, o principal objetivo foi avaliar os efeitos isolados e combinados do clima (variabilidade interanual e CO2), fogo (F) e limitação nutricional por fósforo (P) utilizando o modelo de vegetação dinâmica INLAND na transição entre Amazônia-Cerrado. O modelo INLAND é o primeiro modelo brasileiro que permite simular a dinâmica da vegetação incorporando estes fatores. O INLAND caracteriza a vegetação através de tipos funcionais de planta, que combinados de forma diferente dão origem aos biomas. A limitação nutricional no modelo é estabelecida através de uma função linear entre o teor de fósforo total no solo e a capacidade máxima de carboxilação da enzima Rubisco (Vmax). A Rubisco é a principal enzima responsável por regular as taxas de carboxilação nas plantas com mecanismo fotossintético do tipo C3 atuando diretamente na produtividade primária líquida (NPP) e no incremento de biomassa. Dois mapas de Vmáx foram elaborados para serem utilizados como dados de entrada nas simulações, baseados em dados regionais (PR) (medidas de campo) e globais (PG) de teor de P total no solo. No delineamento do experimento numérico, 24 simulações foram realizadas de forma que diferentes combinações entre os fatores clima, P, F e CO2 fossem obtidas. Para validação das simulações, um mapa de índice de área foliar (LAI) MODIS e dados de biomassa foram contrastados com valores simulados pelo modelo INLAND. Os resultados demonstraram que isoladamente, o efeito do fogo sobre a NPP no Cerrado é positivo e maior em relação aos efeitos da limitação nutricional, contrariamente ao que acontece na região Amazônica onde o P atua na diminuição da NPP. O CO 2 por sua vez quando avaliado combinadamente aos efeitos do fogo demonstrou-se como um amenizador, aumentando a NPP na região de transição. Com relação ao clima, o uso de uma variabilidade inter-anual melhorou a representação dos valores de NPP, biomassa e LAI pelo INLAND. Os valores de LAI e biomassa simulados apresentaram boa correlação com os dados observados de forma que o gradiente de vegetação Amazônia - Cerrado conseguiu ser representado. A melhor representação da composição da vegetação pelo modelo INLAND foi quando considerado os efeitos de PG+F+CO2.
Studies to assess the main factors responsible for the dynamics of vegetation in the Amazon such as climate and / or deforestation suggest the possibility of the Amazon rainforest may not resist a potencial change in rainfall patterns, and be converted to an ecosystem of more sparse vegetation like savanna, which gave rise to the term “Amazon Savannization”. Some of these initial studies, however, used only future climate scenarios, neglecting in their majority the fire effects and especially the effect of nutrient limitation on vegetation dynamics. Recently, in the context of climate modeling, advancements have been made in an attempt to build models that incorporate the nutritional restriction effect and the fire to assess and measure their effects on vegetation at a large scale. In this work, the main objective was to evaluate the isolated and combined effects of climate (inter annual variability and CO2), fire (F) and nutritional limitation by phosphorus (P) using the dynamic vegetation model INLAND in the transition between forest-Cerrado. The INLAND model is the first Brazilian model to simulate the vegetation dynamics incorporating these factors. The INLAND characterizes the vegetation through plant functional types, which combined differently give rise to biomes. The nutritional limitation is established through a linear function of the total phosphorus content in the soil and the maximum carboxylation capacity of Rubisco enzyme (Vmax). The Rubisco is the main enzyme responsible for regulating carboxylation rates in plants with the C3 photosynthetic mechanism type acting directly on net primary productivity (NPP) and the increase of biomass. Two regional the datasets of Vmax to be used as input data of the simulations, based on regional (PR) (field measurements) and global data (PG) of total P content in the soil. In the design of numerical experiment, 24 simulations were performed for different combinations of climate factors, P, F and CO2 were obtained. To validate the simulations, regional datasets of dry season leaf area index (LAI), and biomass were compared against simulated values by the INLAND model. The results showed that isolation, the effect of fire on the NPP in the Cerrado is positive and higher than the effects of nutritional restriction, contrary to what happens in the Amazon biome where the P acts to reduce the NPP. The CO2 when evaluated in combination with the effects of fire acted as an attenuator increasing the NPP in the transition region. With respect to the climate, the use of inter-annual variability improved representation of biomass and LAI simulated by INLAND. The LAI and biomass simulated values showed good correlation with Amazon-Cerrado observed gradient. The best representation of the vegetation composition by INLAND was found when the effects of PG+F+CO2 were combined.
Shurtz, Timothy E. "Influence of Supraglottal Geometry and Modeling Choices on the Flow-Induced Vibration of a Computational Vocal Fold Model." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2885.
Повний текст джерелаKilen, Isak Ragnvald, and Isak Ragnvald Kilen. "Non-Equilibrium Many-Body Influence on Mode-Locked Vertical External-Cavity Surface-Emitting Lasers." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/626375.
Повний текст джерелаWitkowski, Thomas, Rainer Backofen, and Axel Voigt. "The influence of membrane bound proteins on phase separation and coarsening in cell membranes." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-139226.
Повний текст джерелаDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Cellier, Laura. "Rôle de la dynamique mitochondriale à la phase aiguͭe de l'infarctus du myocarde Increase in Cardiac Ischemia-Reperfusion Injuries in Opa1+/- Mouse Model Remote ischemic conditioning influences mitochondrial dynamics." Thesis, Angers, 2017. http://www.theses.fr/2017ANGE0085.
Повний текст джерелаMyocardial infarction (MI) is defined in pathology as « myocardial cell death due to prolonge dischemia ». Currently, reperfusion is the most effective strategy to limit the extent of this myocardial necrosis and to improve the prognosis of patients. Paradoxically, this reperfusion is the cause of additional irreversible damage, called reperfusion injuries. A strategy that was proven efficient in reducing these injuries is the remote ischemic conditioning (RIC). This strategy consists of applying brief, non invasive, episodes of ischemia reperfusion (IR) to an organ or a tissue distant from the ischemic organ, here the heart. Mitochondria play amajor role in both reperfusion injuries and cardioprotection mechanisms. Several studies suggest that the modulation of mitochondrial dynamics, which is mitochondrial fission and fusion mechanisms, could be a new therapeutic strategy for reducing reperfusion injuries. In this work, we studied two transgenic mouse models, one model is deficient in Optic Atrophy 1(OPA1) fusion protein and the other one is deficient in Dynamin Related Protein 1 (DRP1) fission protein. We showed that a partial OPA1 deficiency was associated with an increase in IR injuries and an imbalance in mitochondrial calcium flux, whereas, a partial DRP1 deficiency decreased IR injuries. These data suggest that a therapeutic strategy modulating the mitochondrial dynamics in favor of fusion could reduce IR injuries
Williams, John. "A mathematical model of the dynamics of hepatitis B virus transmission in the UK under the influence of different vaccination control strategies." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298721.
Повний текст джерелаWatson, Peter Alan Gazzi. "The influence of the quasi-biennial oscillation on the stratospheric polar vortices." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:e35d4833-8368-4101-b1fb-17b68c716ae0.
Повний текст джерелаOlofson, Mark William. "The Influence of Adverse Childhood Experiences, Families, Neighborhoods, and School Environments on Cognitive Outcomes among Schoolchildren." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/742.
Повний текст джерелаWitkowski, Thomas, Rainer Backofen, and Axel Voigt. "The influence of membrane bound proteins on phase separation and coarsening in cell membranes." Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27814.
Повний текст джерелаDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Barnaud, Félix. "Influence of advanced unsteady aerodynamic models on the aeroelastic response of an offshore wind turbine." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR31.
Повний текст джерелаThe size of modern offshore wind turbine rotors has reached very large dimensions and keeps increasing in order to reduce the cost of electricity. More challenging designs are thus needed to improve the aerodynamic performances and reduce the structural loads. The state-of-the-art tools such as Blade Element Momentum Theory (BEMT) used to predict the loads and performances of wind turbines have been designed for much smaller rotors in standard operating conditions. Load cases in specific conditions such as yaw misalignment are a priori out of the validity range for such tools. The goal of the thesis is to investigate more advanced aerodynamic models in order to assess the differences in load predictions compared to state-of-the-art tools. In particular, this work focuses on unsteady flows which represent a challenge for engineering tools. For this purpose, a panel method code including viscous effects such as dynamic stall is compared to a BEMT code in realistic wind conditions with large yaw misalignment. The calculations are performed in the framework of aero-servo-elasto coupling in order to be represen¬tative of the load calculations performed in industry following certification standards. The impact of the dynamic stall model is investigated in particular for both BEMT and panel method, for extreme and fatigue loading in cases of yaw misalignment. Differences have been observed between both codes and for several parametrizations of dynamic stall model. In addition, it has been noticed that including the servo-elasto coupling changes a lot the observations regarding aerodynamic loading. Large angles of at¬tack are observed on wind turbine blades in yaw misalignment cases, and the flow around blade sections in such conditions is particularly affected by viscous effects such as dynamic stall or vortex shedding which are not inherently solved by panel methods nor BEMT but modeled with semi-empirical models. Alternative models such as Large Eddy Simulation (LES) that would capture these effects have to be considered. Wall-modeled LES (WMLES) is thus used in the second part of this thesis to investigate the flow around wind turbine dedicated airfoils, much thicker than airfoils used in aeronautics. Several cases are simulated, for attached and detached flows and in steady or oscillating cases. Angles of attack up to 90° are investigated at realistic Reynolds number. It appears that WMLES is able to capture correctly the main flow features in attached conditions and at very high angle of attack with coarse meshes. However, the near stall cases are more challenging to capture even with appropriate wall laws and require very fine meshes to be correctly solved. A comparison is also performed for motions with high reduced frequency and compared to other models, revealing the promising capacities of WMLES in such cases
Chong, Nyuk Sian. "Applications of Filippov's Method to Modelling Avian Influenza." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35818.
Повний текст джерелаSong, Hyunjin. "A Dynamic Longitudinal Examination of Social Networks and Political Behavior: The Moderating Effect of Local Network Properties and Its Implication for Social Influence Processes." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1427490761.
Повний текст джерелаMcGuire, Kelly Lewis. "Governing Dynamics of Divalent Copper Binding by Influenza A Matrix Protein 2 His37 Imidazole." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8647.
Повний текст джерелаTirok, Katrin. "Predator-prey dynamics under the influence of exogenous and endogenous regulation : a data-based modeling study on spring plankton with respect to climate change." Phd thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2008/2452/.
Повний текст джерелаEine der großen Herausforderungen der heutigen ökologischen Forschung ist es, Veränderungen von Ökosystemen vorherzusagen, die mit dem Klimawandel einhergehen. Dafür sind ein umfassendes Verständnis der verschiedenen Steuerungsfaktoren des entsprechenden Systems und Kenntnisse zur Anpassungsfähigkeit des Systems nötig. Auf der Grundlage dieses Wissens, können mit mathematischen Modellen Klimaszenarien gerechnet und Vorhersagen erstellt werden. Die vorliegende Arbeit untersuchte die Regulation des Phytoplanktons (kleine freischwebende einzellige Algen) und seiner Konsumenten (Zooplankton, tierische Kleinstlebewesen) sowie deren Wechselspiel während des Frühjahrs mit Bezug auf den Klimawandel. Als Basis dienten langjährige Daten von einem großen tiefen See (Bodensee) sowie Daten von Versuchen mit Organismen aus einem flachen marinen Gewässer (Kieler Förde, Ostsee). Diese Daten wurden mit statistischen Verfahren und mathematischen Modellen ausgewertet. In Gewässern sind Algen als Primärproduzenten die Nahrungsgrundlage für tierische Organismen bis hin zu Fischen und Meeresfrüchten, und bestimmen die Wasserqualität der Gewässer. Daher ist es wichtig zu verstehen, welche Mechanismen die Dynamik der Algen steuern. Der Grundstein für die saisonale Entwicklung von Phyto- und Zooplankton in Gewässern unserer Breiten wird mit dem Beginn des Wachstums im Frühjahr gelegt. Diese Arbeit zeigt, dass es bereits im zeitigen, noch kalten Frühjahr ein Wechselspiel physikalischer und biologischer Steuerungsmechanismen für die Algenentwicklung gibt. Physikalische Faktoren sind die Wassertemperatur, die Globalstrahlung und die Durchmischung des Gewässers, die durch die Stärke des Windes beeinflusst wird. All diese Steuerungsmechanismen sind eng miteinander verwoben und werden unterschiedlich stark vom Klimawandel beeinflusst. Mit mathematischen Modellen gelang es den Einfluss einzelner Faktoren voneinander zu trennen und zu zeigen, dass Effekte durch den Klimawandel sich gegenseitig aufheben oder aber auch verstärken können. Schon geringe Änderungen an der Basis der Nahrungsnetze können weitreichende Auswirkungen auf höhere Ebenen habe. Wie stark diese Auswirkungen im Einzelnen sind, hängt entscheidend von der Anpassungsfähigkeit gesamter Ökosysteme und ihrer Artengemeinschaften sowie einzelner Individuen ab. Beispielsweise reagiert die Algengemeinschaft auf einen starken Fraßdruck ihrer Räuber mit einer Verschiebung zu weniger gut fressbaren Algenarten. Diese weniger gut fressbaren Arten unterscheiden sich jedoch auch in anderen Eigenschaften, wie zum Beispiel der Ressourcenausnutzung, von besser fressbaren Algen. In dieser Arbeit wurden Modellansätze entwickelt, die diese Fähigkeit zur Anpassung berücksichtigen. Auf dieser Grundlage und mit Einbeziehung der physikalischen Steuerungsfaktoren können Klimaszenarien gerechnet werden und Vorhersagen für den Einfluss des Klimawandels auf unsere Gewässer gemacht werden, die letztlich auch Perspektiven für Handlungsmöglichkeiten aufzeigen.
Grandau, Frank J. "Evaluation of the Naval Research Laboratory Limited Area Dynamical Weather Prediction Model: topographic and coastal influences along the west coast of the United States." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23663.
Повний текст джерелаThis paper describes the evaluation of the NRL Limited Area Dynamical Weather Prediction Model in simulating coastal atmospheric mesoscale phenomena along the west coast of the United States during the period 0000 UTC 02 May - 1200 UTC 03 May 1990. A graphical comparison technique was used. Model output was compared horizontally with large-scale analyses, station data, cross-section analyses, and vertical profiles at specific locations. The model successfully simulated the wind and temperature fields, but failed to accurately replicate moisture and height fields.
Shem, Willis Otieno. "Biosphere-Atmopshere Interaction over the Congo Basin and its Influence on the Regional Hydrological Cycle." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11558.
Повний текст джерелаCoufalík, Pavel. "Reologické vlastnosti asfaltových pojiv." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-355627.
Повний текст джерелаCherif, Alhaji. "Mathematical evolutionary epidemiology : limited epitopes, evolution of strain structures and age-specificity." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:28dec0f4-e6da-466a-905c-d875f132415e.
Повний текст джерела