Global ETD Search

311	Brisure CP/T via les produits triples dans les désintégrations des hadrons à saveur de beauté Bensalem, Wafia 05 1900 (has links) Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal. / Cette thèse est constituée de quatre articles qui ont tous été publiés. Le sujet principal est l’étude d’asymétries de brisure CP/T via les produits triples dans les désintégrations des hadrons contenant un quark b (mésons B ou hypérons Ab) et ce, dans le modèle standard de la physique des particules et au-delà. / This thesis is comprised of four articles, ail of which have been published. The main subject is the study, in and beyond the standard model of particle physics, of CP/T-violation via triple products in decays of hadrons containing a b quark (B mesons or Ab hyperons). Modèle standard Nouvelle physique Spin Polarisation Parité Conjugaison de charge Renversement du sens du temps Asymétrie avant-arrière Lagrangien efficace Modèle de factorisation Standard model New physics Symmetry Triple product Polarization CP/T-violation Decay Forward-backward asymmetry Effective lagrangian Factorization model
312	Numerical Simulations of Wave Propagation between a Left-Handed Material and a Right-Handed Material / Numeriska simuleringar av vågutbredning mellan ett vänsterhänt material och ett högerhänt material Rana, Balwan January 2021 (has links) The discovery of metamaterials has led to major advances in different fields of physics including optics, microwave engineering and acoustics. Specific to theoretical electromagnetism, the introduction of metamaterials have led to the development of negative-index materials (NIMs) with simultaneous negative permittivity and negative permeability with backward-wave propagation. In recent studies, exact analytical solutions for wave propagation from a step/graded-index interface between a right-handed material (RHM) and a left-handed material (LHM) have been obtained. This study attempts to provide numerical validation of the analytical solutions obtained by Dalarsson et al. by using the simulation tool CST. An square-SRR/strip-wire unit element was designed, with real part of relative permittivity equal to -1.96 and real part of relative permeability equal to -1.01. Such unit elements were orderly structured to produce a NIM structure. Furthermore, a positive-index material (PIM) structure was produced by reversing the sign of the material properties of the NIM. Both the results for the step- and graded-index interfaces have shown to possess backward-wave propagation for a normal incidence angle. The graded-index interface profiles have a more smooth and continuous wave propagation between the materials, which counteracts the effects of discontinuous material transitions present in step-index interface profiles. However, because the results of the present study were considerably affected by unwanted field effects, the analytical solutions are only qualitatively validated, and not validated in terms of their numerical accuracy. / Upptäckten av metamaterial har lett till stora framsteg inom olika fysikområden inklusive optik, mikrovågsteknik och akustik. Specifikt för teoretisk elektromagnetism, har introduktionen av metamaterial lett till utvecklingen av negativa indexmaterial (NIM) med samtidig negativ permittivitet och negativ permeabilitet med bakåtvågsutbredning. I nyligen genomförda studier, har exakta analytiska lösningar för vågutbredning över ett steg-/graderat- indexgränssnitt mellan ett högerhänt material (RHM) och ett vänsterhänt material (LHM) erhållits. Denna studie försöker tillhanda-hålla numerisk validering, med hjälp av simuleringsverktyget CST, av de analytiska lösningar som erhållits av Dalarsson et al. En square-SRR/strip-wire enhetselement designades, med realdelen av relativ permittivitet lika med -1,96 och realdelen av relativ permeabilitet lika med -1,01. Sådana enhetselement strukturerades för att producera en materialstruktur med negativt index. Dessutom producerades en materialstruktur med positivt index (PIM) genom att vända tecknet av materialegenskaperna hos det negativa indexmaterialet (NIM). Både resultaten för steggränssnittet och det graderade indexgränssnittet har visat sig ha bakåtvågutbredning för vinkelrätt infall. De graderade indexgränssnittsprofilerna har en mer jämn och kontinuerlig vågutbredning mellan materialen, vilket motverkar effekterna av diskontinuerliga materialövergångar som finns i stegindexgränssnittsprofiler. Men eftersom resultaten av den aktuella studien påverkades avsevärt av oönskade fälteffekter, har de analytiska lösningarna validerats endast kvalitativt och valideras inte i termer av deras numeriska noggrannhet. Negative-Index Material NIM Positive-Index Material RHM Backward- Wave Propagation Step-Index Interface Graded-Index Interface Left-Handed Material LHM Right-Handed Material RHM Analytical Solution Validation Negativt-Index Material NIM Positivt-Index Material PIM Bakåtvåg-utbredning Steg-Index Gränssnitt Gradering-Index Gränssnitt Vänsterhänt Material LHM Högerhänt Material RHM Analytisk Lösning Validering Elektroteknik och elektronik
313	東アジアにおける大気汚染物質の挙動解明を目的とした自然放射能ラドンの同時測定飯田, 孝夫, 森泉, 純, 小村, 和久, 吉岡, 勝廣, 金, 潤信 03 1900 (has links) 科学研究費補助金研究種目:基盤研究(B)(2) 課題番号:10044148 研究代表者:飯田孝夫研究期間:1998-1999年度 atmospheric pollution backward trajectory analysis dispersion global environmental problem radioactive tracer radon-222 regional diffusion time series analysis トレーサラドン原子力事故地球環境問題大気汚染物資大気汚染物質広域拡散放射性物質時間変動解析流跡線解析移流・拡散酸性雨韓国
314	Možnosti rozvoje malé obchodní firmy / Development Possibilities of Small Retail Company Berková, Hana January 2009 (has links) The degree project „Development Possibilities of Small Retail Company“ analyses problems relating to the development possibilities of small trading company. This diploma thesis contains a project which aims to lead an existing company to the higher prosperity level and to increase market ratio.
315	Možnosti rozvoje malé obchodní firmy / Development Possibilities of Small Retail Company Berková, Hana January 2009 (has links) The degree project „Development Possibilities of Small Retail Company“ analyses problems relating to the development possibilities of small trading company. This diploma thesis contains a project which aims to lead an existing company to the higher prosperity level and to increase market ratio.
316	微細複合組織金属の変形機構および塑性加工性に関する研究 / ビサイフクゴウソシキキンゾクノヘンケイキコウオヨビソセイカコウセイニカンスルケンキュウ名取恵子, Keiko Natori 22 March 2014 (has links) ヘテロ構造組織を有する鉄・非鉄金属の組織形態に注目して,微視的構造やその挙動が巨視的現象(変形特性,成形性)として発現するメカニズムを解明することを目的とした.鉄系金属ではDual Phase型高張力鋼のスプリングバック現象のひずみ速度依存性,非鉄系金属では半凝固鋳造法と強ひずみ加工を組み合わせた亜共晶アルミニウム合金の衝撃後方押出し成形性に注目した.これらの検討によりいずれの試料においても,結晶粒界よりもスケールの大きいヘテロ構造に由来した変形機構が支配的であることが明らかになった. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University 二相鋼高張力鋼バウシンガー効果ハット曲げスプリングバックひずみ速度依存性アルミニウム合金共晶半凝固鋳造強ひずみ加工 ECAP加工衝撃後方押出し Dual Phase steel high strength steel Bauschinger effect hat-bending forming springback strain rate dependence Aluminum alloy eutectic semi-solid cast Severe Plastic Deformation equal-channel angular pressing impact backward extrusion
317	Affirmative action: a comparative study Deane, Tameshnie 30 November 2005 (has links) Racial and gender inequality, as well as other forms of discrimination has been a part of the South African, American and Indian histories for a very long time. Even today racial disparity is still very evident in the South African and American societies whilst discrimination based on caste is still prevalent in the Indian society. This is illustrated by continued racial discrimination and the remaining signs of societal segregation. Due to continuing disparities amongst the people, it became necessary to implement affirmative action programmes. Focusing in particular on education and jobs, affirmative action policies require active measures to be taken to ensure that blacks and other minorities enjoy the same opportunities for career advancement and school admissions that had been the nearly exclusive province of whites in SA and the USA, or for the forward castes in India. Affirmative action has been both praised and denounced, as an answer to racial inequality. One of the key issues that arise when affirmative action is discussed is whether or not affirmative action in fact promotes equality and atones for past prejudices. Another concern is whether the current affirmative action policy is the right policy to use. The issues surrounding affirmative action seems to be universal as are the circumstances. Perhaps the most widespread similarity among the programmes in these very different countries has been that group preferences and quotas are almost always discussed. The debate on affirmative action exists because it is a very divisive issue and it affects different groups of people in different ways, and some groups or persons seemingly benefit more from affirmative action than other persons or groups. In addition, it causes people to be classified into groups, and at the same time, strives to break down group barriers. It is an issue that is difficult to resolve because people have varied ideas about how the problems of racial inequality and historical discrimination should be addressed / Jurisprudence / LLD Merit principle Equality Caste discrimination Apartheid Affirmative action Affirmative action terminology Beneficiaries of affirmative action Backward classes Reservation system Scheduled castes Suitably qualified Unfair discrimination Anti-discrimination legislation 342.87 Constitutional law -- South Africa Constitutional law -- United States Constitutional law -- India
318	Enhanching the Human-Team Awareness of a Robot Wåhlin, Peter January 2012 (has links) The use of autonomous robots in our society is increasing every day and a robot is no longer seen as a tool but as a team member. The robots are now working side by side with us and provide assistance during dangerous operations where humans otherwise are at risk. This development has in turn increased the need of robots with more human-awareness. Therefore, this master thesis aims at contributing to the enhancement of human-aware robotics. Specifically, we are investigating the possibilities of equipping autonomous robots with the capability of assessing and detecting activities in human teams. This capability could, for instance, be used in the robot's reasoning and planning components to create better plans that ultimately would result in improved human-robot teamwork performance. we propose to improve existing teamwork activity recognizers by adding intangible features, such as stress, motivation and focus, originating from human behavior models. Hidden markov models have earlier been proven very efficient for activity recognition and have therefore been utilized in this work as a method for classification of behaviors. In order for a robot to provide effective assistance to a human team it must not only consider spatio-temporal parameters for team members but also the psychological.To assess psychological parameters this master thesis suggests to use the body signals of team members. Body signals such as heart rate and skin conductance. Combined with the body signals we investigate the possibility of using System Dynamics models to interpret the current psychological states of the human team members, thus enhancing the human-awareness of a robot. / Användningen av autonoma robotar i vårt samhälle ökar varje dag och en robot ses inte längre som ett verktyg utan som en gruppmedlem. Robotarna arbetar nu sida vid sida med oss och ger oss stöd under farliga arbeten där människor annars är utsatta för risker. Denna utveckling har i sin tur ökat behovet av robotar med mer människo-medvetenhet. Därför är målet med detta examensarbete att bidra till en stärkt människo-medvetenhet hos robotar. Specifikt undersöker vi möjligheterna att utrusta autonoma robotar med förmågan att bedöma och upptäcka olika beteenden hos mänskliga lag. Denna förmåga skulle till exempel kunna användas i robotens resonemang och planering för att ta beslut och i sin tur förbättra samarbetet mellan människa och robot. Vi föreslår att förbättra befintliga aktivitetsidentifierare genom att tillföra förmågan att tolka immateriella beteenden hos människan, såsom stress, motivation och fokus. Att kunna urskilja lagaktiviteter inom ett mänskligt lag är grundläggande för en robot som ska vara till stöd för laget. Dolda markovmodeller har tidigare visat sig vara mycket effektiva för just aktivitetsidentifiering och har därför använts i detta arbete. För att en robot ska kunna ha möjlighet att ge ett effektivt stöd till ett mänskligtlag måste den inte bara ta hänsyn till rumsliga parametrar hos lagmedlemmarna utan även de psykologiska. För att tyda psykologiska parametrar hos människor förespråkar denna masteravhandling utnyttjandet av mänskliga kroppssignaler. Signaler så som hjärtfrekvens och hudkonduktans. Kombinerat med kroppenssignalerar påvisar vi möjligheten att använda systemdynamiksmodeller för att tolka immateriella beteenden, vilket i sin tur kan stärka människo-medvetenheten hos en robot. / <p>The thesis work was conducted in Stockholm, Kista at the department of Informatics and Aero System at Swedish Defence Research Agency.</p> robotics Artificial Intelligence AI System Dynamics Wireless Body Area Network WBAN sensors Psychology physiology human behavior Human-Robot-Interaction HRI robot Human-Team awareness human-robot RapidMiner Vensim JaHMM hidden markov models HMM eclipse rcp ARFF recognizer classification cross-validation human behavior stress detection Galvanic Skin Response Heart Rate Skin Temperature Finger Temperature Electrocardiogram ECG GSR ST Pupil Diameter PD Patient monitoring GPS Data acquisition dataset data set MODERE Yerkes-Dodson SD model SD Confusion matrix spatial MOUT Java Agent robotic agent Machine Learning activity recognition team oriented robot Evaluation Decoding Learning Forward Algorithm Backward Algorithm Baum-Welch feedback loop Situation Awareness SA Shared Mental Models SMM
319	Affirmative action: a comparative study Deane, Tameshnie 30 November 2005 (has links) Racial and gender inequality, as well as other forms of discrimination has been a part of the South African, American and Indian histories for a very long time. Even today racial disparity is still very evident in the South African and American societies whilst discrimination based on caste is still prevalent in the Indian society. This is illustrated by continued racial discrimination and the remaining signs of societal segregation. Due to continuing disparities amongst the people, it became necessary to implement affirmative action programmes. Focusing in particular on education and jobs, affirmative action policies require active measures to be taken to ensure that blacks and other minorities enjoy the same opportunities for career advancement and school admissions that had been the nearly exclusive province of whites in SA and the USA, or for the forward castes in India. Affirmative action has been both praised and denounced, as an answer to racial inequality. One of the key issues that arise when affirmative action is discussed is whether or not affirmative action in fact promotes equality and atones for past prejudices. Another concern is whether the current affirmative action policy is the right policy to use. The issues surrounding affirmative action seems to be universal as are the circumstances. Perhaps the most widespread similarity among the programmes in these very different countries has been that group preferences and quotas are almost always discussed. The debate on affirmative action exists because it is a very divisive issue and it affects different groups of people in different ways, and some groups or persons seemingly benefit more from affirmative action than other persons or groups. In addition, it causes people to be classified into groups, and at the same time, strives to break down group barriers. It is an issue that is difficult to resolve because people have varied ideas about how the problems of racial inequality and historical discrimination should be addressed / Jurisprudence / LLD Merit principle Equality Caste discrimination Apartheid Affirmative action Affirmative action terminology Beneficiaries of affirmative action Backward classes Reservation system Scheduled castes Suitably qualified Unfair discrimination Anti-discrimination legislation 342.87 Constitutional law -- South Africa Constitutional law -- United States Constitutional law -- India
320	Contrôle optimal des équations d'évolution et ses applications / Optimal control of evolution equations and its applications Nabolsi, Hawraa 17 July 2018 (has links) Dans cette thèse, tout d’abord, nous faisons l’Analyse Mathématique du modèle exact du chauffage radiatif d’un corps semi-transparent $\Omega$ par une source radiative noire qui l’entoure. Il s’agit donc d’étudier le couplage d’un système d’Equations de Transfert Radiatif avec condition au bord de réflectivité indépendantes avec une équation de conduction de la chaleur non linéaire avec condition limite non linéaire de type Robin. Nous prouvons l’existence et l’unicité de la solution et nous démontrons des bornes uniformes sur la solution et les intensités radiatives dans chaque bande de longueurs d’ondes pour laquelle le corps est semi-transparent, en fonction de bornes sur les données, Deuxièmement, nous considérons le problème du contrôle optimal de la température absolue à l’intérieur du corps semi-transparent $\Omega$ en agissant sur la température absolue de la source radiative noire qui l’entoure. À cet égard, nous introduisons la fonctionnelle coût appropriée et l’ensemble des contrôles admissibles $T_{S}$, pour lesquels nous prouvons l’existence de contrôles optimaux. En introduisant l’espace des états et l’équation d’état, une condition nécessaire de premier ordre pour qu’un contrôle $T_{S}$ : t ! $T_{S}$ (t) soit optimal, est alors dérivée sous la forme d’une inéquation variationnelle en utilisant le théorème des fonctions implicites et le problème adjoint. Ensuite, nous considérons le problème de l’existence et de l’unicité d’une solution faible des équations de la thermoviscoélasticité dans une formulation mixte de type Hellinger- Reissner, la nouveauté par rapport au travail de M.E. Rognes et R. Winther (M3AS, 2010) étant ici l’apparition de la viscosité dans certains coefficients de l’équation constitutive, viscosité qui dépend dans ce contexte de la température absolue T(x, t) et donc en particulier du temps t. Enfin, nous considérons dans ce cadre le problème du contrôle optimal de la déformation du corps semi-transparent $\Omega$, en agissant sur la température absolue de la source radiative noire qui l’entoure. Nous prouvons l’existence d’un contrôle optimal et nous calculons la dérivée Fréchet de la fonctionnelle coût réduite. / This thesis begins with a rigorous mathematical analysis of the radiative heating of a semi-transparent body made of glass, by a black radiative source surrounding it. This requires the study of the coupling between quasi-steady radiative transfer boundary value problems with nonhomogeneous reflectivity boundary conditions (one for each wavelength band in the semi-transparent electromagnetic spectrum of the glass) and a nonlinear heat conduction evolution equation with a nonlinear Robin boundary condition which takes into account those wavelengths for which the glass behaves like an opaque body. We prove existence and uniqueness of the solution, and give also uniform bounds on the solution i.e. on the absolute temperature distribution inside the body and on the radiative intensities. Now, we consider the temperature $T_{S}$ of the black radiative source S surrounding the semi-transparent body $\Omega$ as the control variable. We adjust the absolute temperature distribution (x, t) 7! T(x, t) inside the semi-transparent body near a desired temperature distribution Td(·, ·) during the time interval of radiative heating ]0, tf [ by acting on $T_{S}$. In this respect, we introduce the appropriate cost functional and the set of admissible controls $T_{S}$, for which we prove the existence of optimal controls. Introducing the State Space and the State Equation, a first order necessary condition for a control $T_{S}$ : t 7! $T_{S}$ (t) to be optimal is then derived in the form of a Variational Inequality by using the Implicit Function Theorem and the adjoint problem. We come now to the goal problem which is the deformation of the semi-transparent body $\Omega$ by heating it with a black radiative source surrounding it. We introduce a weak mixed formulation of this thermoviscoelasticity problem and study the existence and uniqueness of its solution, the novelty here with respect to the work of M.E. Rognes et R. Winther (M3AS, 2010) being the apparition of the viscosity in some of the coefficients of the constitutive equation, viscosity which depends on the absolute temperature T(x, t) and thus in particular on the time t. Finally, we state in this setting the related optimal control problem of the deformation of the semi-transparent body $\Omega$, by acting on the absolute temperature of the black radiative source surrounding it. We prove the existence of an optimal control and we compute the Fréchet derivative of the associated reduced cost functional. Fonction de Planck Fonctionnelle coût Fonctionnelle coût réduite Existence de contrôles optimaux Espace des états Continuité des états Différentiabilité Fréchet Problème adjoint Équation parabolique rétrograde Inéquation variationnelle Thermoviscoélasticité Existence et unicité de la solution Contrôle du champ de déplacements Planck function Cost functional Reduced cost functional Existence of optimal controls State space Continuity of the states State equation Fréchet differentiability Implicit Function Theorem Adjoint Problem Backward parabolic equation Variational inequality Thermoviscoelasticity Maxwell model in thermoviscoelasticity Existence and uniqueness of the solution Control of the field of displacements

Search results