Global ETD Search

701	Reinforcement Learning and Feedback Control for High-Level Upper-Extremity Neuroprostheses Jagodnik, Kathleen M. 11 June 2014 (has links) No description available. Artificial Intelligence Behavioral Psychology Behavioral Sciences Biomedical Engineering Computer Engineering Computer Science Engineering Health Care Psychology Rehabilitation Functional Electrical Stimulation Control Upper Extremity Arm Reinforcement Learning High-Level Paralysis Spinal Cord Injury Feedback Control Proportional-Derivative Simulation Human Experiments Musculoskeletal Model
702	Assessing the Variability of Phytoplankton Assemblages in Old Woman Creek, Ohio Bonini, Nick 08 August 2016 (has links) No description available. Aquatic Sciences Biological Oceanography Environmental Geology Environmental Science Geology Limnology Water Resource Management Old Woman Creek Lake Erie algal blooms phytoplankton water quality estuary barrier beach VNIR derivative spectroscopy VPCA principal component analysis remote sensing prediction model net community production streamflow
703	クラスター展開法を利用した新しい波動関数理論の開発とその応用平尾, 公彦, 中辻, 博 03 1900 (has links) 科学研究費補助金研究種目:一般研究(B) 課題番号:01470008 研究代表者:平尾公彦研究期間:1989-1990年度クラスター展開法 SAC法 SAC-CI法多配置 SAC法 Cluster Expansion 多配置SAC法 SAC-CI Theory Hellmann-Feynman Theorem Correlation Energy 開殻系 SAC法電子相関問題 SAC-CI法開殻系SAC法 SAC (Symmetry Adapted Cluster) Theory Analytic Derivative Theory
704	Interactions d’ondes et de bord Marcou, Alice 17 June 2011 (has links) Tout d'abord, des ondes de surface, solutions de problèmes aux limites hyperboliques non linéaires, sont étudiées : on construit une solution BKW sous forme de développement infini en puissance de epsilon. On le justifie rigoureusement, en construisant une solution exacte, qui admet ce développement asymptotique. On montre que la solution n'est pas nécessairement purement localisée sur la frontière, même lorsque le terme source l'est ; l'exemple d'un cas particulier de l'élasticité est traité. Ensuite, on étudie la réflexion d'ondes non linéaires discontinues, pour des problèmes aux limites hyperboliques, faiblement bien posés, ni fortement stables, ni fortement instables. On étudie comment les singularités d'une solution striée sont réfléchies lorsque la solution atteint la frontière. On prouve des estimations striées et en normes infinies. On montre qu'une discontinuité du gradient de la solution à travers un hyperplan peut être réfléchie en une discontinuité de la solution elle-même. / We first study surface waves, solutions of hyperbolic nonlinear boundary value problems. We construct BKW solutions in the weakly nonlinear regime with infinite expansion in powers of ε. We rigorously justify this expansion,constructing exact solutions, which admit the asymptotic expansions. We also show that the solution is not necessarily localized at the order O(ε∞) in the interior, even if the data are ; a particular case of elasticity is studied: we prove that fast oscillatory elastic surface waves can produce non trivial internal non oscillatory displacements.Afterwards, we study the reflection of non linear discontinuous waves, for weakly well-posed hyperbolic boundary value problems, satisfying the (WR) condition, which has been introduced in [1, 12], that is in a case where the IBVP is neither strongly stable, nor strongly unstable. We study how the singularities of a striated solution are reflected when the solution hits the boundary. We prove striated estimates and L∞ estimates and observe the loss of one derivative: we show that a discontinuityof the gradient of the solution across an hyperplane can be reflected in a discontinuity across an hyperplane of the solution itself. Ondes de surface Problèmes aux limites non linéaires Développement BKW Développement asymptotique rigoureux Ondes de Rayleigh non linéaires Rectification Élasticité Réflexion de discontinuités Condition faible de Lopatinski Condition (WR) Perte d'une dérivée Solutions striées Surface waves Nonlinear boundary value problems WKB expansion Rigorous asymptotic expansion Non linear Rayleigh waves Rectification Elasticity Reflection of discontinuities Nonlinear weakly stable hyperbolic IBVP Weak Lopatinski condition (WR) condition Loss of one derivative Striated solutions
705	Analogová implementace prvků neceločíselného řádu a jejich aplikace / Analog Implementation of Fractional-Order Elements and Their Applications Kartci, Aslihan January 2019 (has links) S pokroky v teorii počtu neceločíselného řádu a také s rozšířením inženýrských aplikací systémů neceločíselného řádu byla značná pozornost věnována analogové implementaci integrátorů a derivátorů neceločíselného řádu. Je to dáno tím, že tento mocný matematický nástroj nám umožňuje přesněji popsat a modelovat fenomén reálného světa ve srovnání s klasickými „celočíselnými“ metodami. Navíc nám jejich dodatečný stupeň volnosti umožňuje navrhovat přesnější a robustnější systémy, které by s konvenčními kondenzátory bylo nepraktické nebo nemožné realizovat. V předložené disertační práci je věnována pozornost širokému spektru problémů spojených s návrhem analogových obvodů systémů neceločíselného řádu: optimalizace rezistivně-kapacitních a rezistivně-induktivních typů prvků neceločíselného řádu, realizace aktivních kapacitorů neceločíselného řádu, analogová implementace integrátoru neceločíselného řádů, robustní návrh proporcionálně-integračního regulátoru neceločíselného řádu, výzkum různých materiálů pro výrobu kapacitorů neceločíselného řádu s ultraširokým kmitočtovým pásmem a malou fázovou chybou, možná realizace nízkofrekvenčních a vysokofrekvenčních oscilátorů neceločíselného řádu v analogové oblasti, matematická a experimentální studie kapacitorů s pevným dielektrikem neceločíselného řádu v sériových, paralelních a složených obvodech. Navrhované přístupy v této práci jsou důležitými faktory v rámci budoucích studií dynamických systémů neceločíselného řádu.
706	New modelling and simulation methods to support clean marine propulsion Grant, Michael 24 August 2021 (has links) The marine industry has increased its adoption of pure-electric, diesel-electric, and other non-traditional propulsion architectures to reduce ship emissions and fuel consumption. While these technologies can improve performance, the design of a propulsion system becomes challenging, given that no single technology is superior across all vessel types. Furthermore, even identical ships with different operating patterns may be better suited to different propulsion technologies. Addressing this problem, previous research has shown that if key elements of a vessel's operational pro file are known, simulation and optimization techniques can be employed to evaluate multiple propulsion architectures and result in a better propulsion system design and energy management strategy for a given vessel. While these studies have demonstrated the performance improvements that can be achieved from optimizing clean marine propulsion systems, they rely on vessel operational profiles obtained through physical measurement from existing ships. From a practical point of view, the optimization of a vessel's propulsion system needs to occur prior to a vessel's construction and thus precludes physical measurement. To this end, this thesis introduces a marine simulation platform for producing vessel operational profiles which enable propulsion system optimization during the ship design process. Core subsystem modules are constructed for simulating ship motions in 3 degrees of freedom and result in operational profile time-series, including propulsion power. Data is acquired from a benchmark vessel to validate the simulation. Results show the proposed approach strikes a balance between speed, accuracy, and complexity compared with other available tools. / Graduate model-based design MBD hybrid marine propulsion optimization simulation ship vessel DOF motion propeller torque thrust diesel-electric all-electric EV FES BES PHES HES ESS energy automation autonomous resistance hull ocean current added mass platform CFD hybrid electric batteries ultra capacitors emissions fuel consumption LNG motor engine energy management strategy control power energy wind waves strain coefficient hydrodynamic derivative MMG Maneuvering Modeling Group manoeuvring ferry design electric diesel azimuth thruster podded fouling roughness autopilot
707	Contribution à l'analyse mathématique et à la résolution numérique d'un problème inverse de scattering élasto-acoustique / Contribution to the mathematical analysis and to the numerical solution of an inverse elasto-acoustic scattering problem Estecahandy, Elodie 19 September 2013 (has links) La détermination de la forme d'un obstacle élastique immergé dans un milieu fluide à partir de mesures du champ d'onde diffracté est un problème d'un vif intérêt dans de nombreux domaines tels que le sonar, l'exploration géophysique et l'imagerie médicale. A cause de son caractère non-linéaire et mal posé, ce problème inverse de l'obstacle (IOP) est très difficile à résoudre, particulièrement d'un point de vue numérique. De plus, son étude requiert la compréhension de la théorie du problème de diffraction direct (DP) associé, et la maîtrise des méthodes de résolution correspondantes. Le travail accompli ici se rapporte à l'analyse mathématique et numérique du DP élasto-acoustique et de l'IOP. En particulier, nous avons développé un code de simulation numérique performant pour la propagation des ondes associée à ce type de milieux, basé sur une méthode de type DG qui emploie des éléments finis d'ordre supérieur et des éléments courbes à l'interface afin de mieux représenter l'interaction fluide-structure, et nous l'appliquons à la reconstruction d'objets par la mise en oeuvre d'une méthode de Newton régularisée. / The determination of the shape of an elastic obstacle immersed in water from some measurements of the scattered field is an important problem in many technologies such as sonar, geophysical exploration, and medical imaging. This inverse obstacle problem (IOP) is very difficult to solve, especially from a numerical viewpoint, because of its nonlinear and ill-posed character. Moreover, its investigation requires the understanding of the theory for the associated direct scattering problem (DP), and the mastery of the corresponding numerical solution methods. The work accomplished here pertains to the mathematical and numerical analysis of the elasto-acoustic DP and of the IOP. More specifically, we have developed an efficient numerical simulation code for wave propagation associated to this type of media, based on a DG-type method using higher-order finite elements and curved edges at the interface to better represent the fluid-structure interaction, and we apply it to the reconstruction of objects with the implementation of a regularized Newton method. Interaction fluide-solide Problème de diffraction Fréquence de Jones Inégalité de Gärding Alternative de Fredholm Espace de Sobolev à poids Méthode de Galerkin discontinue Méthode élément fini Raffinement hp Effet de pollution Arêtes de frontière courbes Factorisation LU Différentiabilité au sens de Fréchet Dérivée de domaine Frontière Lipschitzienne Théorème des fonctions implicites Méthode de Newton Régularisation de Tikhonov Domaine étoilé B-splines quadratiques Fluid-solid interaction Scattering problem Jones frequency Gärding's inequality Fredholm alternative Weighted Sobolev space Discontinuous Galerkin method Finite element method Hp-refinement, Pollution effect Curved boundary edges LU factorization Fréchet differentiability Domain derivative Lipschitz boundary Implicit function theorem Newton method Tikhonov regularization Star domain Quadratic B-splines.
708	Development of Sensors and Microcontrollers for Underwater Robots Jebelli, Ali January 2014 (has links) Nowadays, small autonomous underwater robots are strongly preferred for remote exploration of unknown and unstructured environments. Such robots allow the exploration and monitoring of underwater environments where a long term underwater presence is required to cover a large area. Furthermore, reducing the robot size, embedding electrical board inside and reducing cost are some of the challenges designers of autonomous underwater robots are facing. As a key device for reliable operation-decision process of autonomous underwater robots, a relatively fast and cost effective controller based on Fuzzy logic and proportional-integral-derivative method is proposed in this thesis. It efficiently models nonlinear system behaviors largely present in robot operation and for which mathematical models are difficult to obtain. To evaluate its response, the fault finding test approach was applied and the response of each task of the robot depicted under different operating conditions. The robot performance while combining all control programs and including sensors was also investigated while the number of program codes and inputs were increased. AUV Autonomous Underwater Vehicles ADC Analog to Digital Converter Cd Drag coefficient of the object DOF Degree of Freedom KT Thrust coefficient Fd Force of drag g Acceleration of gravity h Height of the fluid above the object KQ Torque coefficient mb Buoyant mass NN Neural network P Proportional controller PI Proportional-integral controller PID ρ Density of the fluid Q Torque of the propeller ROV Remotely Operated Vehicles RPM Speed of the motor or propeller SDO Serial data output SMC Sliding mode control Measured thrust T° Temperature v AV Advance speed of the propeller
709	La protection des actionnaires minoritaires dans les sociétés anonymes : étude comparative du droit français et du droit chinois / The protection of minority shareholders of companies limited by shares : a comparative study of french law and chinese law Li, Xiaoshan 22 June 2011 (has links) La présente étude a pour objet de montrer que les moyens de la protection des actionnaires minoritaires en droit chinois et en droit français ne sont pas soumis à des critères fondamentalement différents. Dans les sociétés anonymes, les règles juridiques visent à trouver un équilibre des rapports entre les actionnaires majoritaires et minoritaires, ainsi qu’entre les actionnaires et la société ou le groupe de sociétés.C’est l’intérêt social et le principe d’égalité qui guident le législateur et le juge de proposer des solutions convenables.Il importe de noter qu’en droit français, les dispositions sur les responsabilités et les moyens de recours pour les minoritaires sont d’applications faciles qu’en droit chinois. D’ailleurs, la recherche de l’acquisition des sociétés cotées chinoises sous l’angle de la protection des minoritaires, tout à fait différent à l’offre publique en droit français, présente les particularités du marché réglementé chinois et mérite que les investisseurs étrangers découvrent davantage. / The dissertation aimed to point out that the methods of the protection of minority shareholders in Chinese law and in French law are not subject to the different criteria. In company limited by shares, the legal provisions intend to find a balance of relation between majority shareholders and minority shareholders, and between the shareholders and the company or group of company. It is corporate profits and the principal of equality that direct legislators and judges to suggest applicable solutions.It is important to notify that in French law, legal provisions about the responsibility of majority shareholders or company leaders and the ways of resort of minority shareholders provide reference for improvement of Chinese law. Besides, the study of acquisition of chinese listed companies, looked from the angle of the protection of minority shareholders, very different from tender offer in French law, demonstrate the characteristics of Chinese stock market and deserve foreign investors’ enough attention. Droit chinois Actionnaire minoritaire Droit à l'information Droit de vote Abus de majorité Intérêt social Droit aux bénéfices Action sociale ut universi Action sociale ut singuli Marché financier chinois Négociation d'un bloc de contrôle Offre publique Devoir de loyauté Principe d'égalité France Chine Chinese law Minority shareholder Voting right Abuse of majority Company profits Property rights of minority shareholders Rights of profit sharing Shareholders derivative suit Direct action Chinese stock market Takeover agreement Tender offer Fiduciary duty Principal of equality Company limited by shares Listed company Minority stockholders Legal protection France China
710	Feigenbaum Scaling Sendrowski, Janek January 2020 (has links) In this thesis I hope to provide a clear and concise introduction to Feigenbaum scaling accessible to undergraduate students. This is accompanied by a description of how to obtain numerical results by various means. A more intricate approach drawing from renormalization theory as well as a short consideration of some of the topological properties will also be presented. I was furthermore trying to put great emphasis on diagrams throughout the text to make the contents more comprehensible and intuitive. Feigenbaum Feigenbaum constant Feigenbaum point superstable self-similarity fractals final-state diagram logistic map period-doubling operator linearized period-doubling operator Cantor set Sharkovsky sequence Chebyshev interpolation stable manifold unstable manifold orbits fixed points scaling factor pitchfork bifurcation cobweb plot renormalization iterates one-hump map unimodal map bifurcation cascade Feigenbaum universality chaos theory spectrum generalized Feigenvalues bifurcation points superstable points fixed function universal function eigenvalues eigenvectors eigenfunctions universality conditions Schwarzian derivative Newton’s method power method Arnoldi’s method attractive fixed point repellent fixed point Banach fixed-point theorem collocation method functional analysis topology Mathematical Analysis Matematisk analys Other Mathematics Annan matematik Computational Mathematics Beräkningsmatematik

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