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Beer, Jeremy Michael. "The influence of rearing order on personality : data from biological and adoptive siblings /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
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Van, Zyl Heleneze. "Resilience among middle-born children / H. van Zyl." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7252.
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Existing literature on resilience portrays middle-born children as vulnerable. Middle-born children have to face many risks, such as a tendency towards delinquent behaviour, having poor relations with family members, being low achievers and harbouring negative feelings. Many children who face risk and who consequently are in danger of maladaptive outcomes manage to bounce back from these risks. Such children are called resilient. Research suggests that resilience among children is a common phenomenon, but no literature exists that focuses specifically on resilience among middle-born children. Because of personal experience, I as the researcher believe middle-born children can display resilience in the face of their particular risks. The purpose of this study therefore was to explore, by means of a literature study and empirical research, what the antecedents of resilience among middle-born children might be. This was done by using a concurrent triangulated mixed method design: Six resilient middle-born children completed a self-report questionnaire (RSCA) and participated in semi-structured interviews. The findings were mixed and allowed understanding of what encourages resilience in middle-born children. This study contributes to theory by identifying the resilience-promoting processes (both intra- and interpersonal) which contribute to resilience among middle-born children. This study's findings also transform the stereotypical view of middle-born children as vulnerable only.<br>Thesis (M.Ed.)--North-West University, Vaal Triangle Campus, 2011
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Thye, Melissa D. "Assessing the Second Born: The Role of Competitiveness and Extrinsic Motivation in Birth Order." Honors in the Major Thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1565.
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Birth order may represent one of the most influential environmental factors that directly impacts personality development and even life outcomes. The present study sought to expand upon the existing literature by examining the motivational and dispositional differences between first born and second born individuals. Research indicates that first born children show significantly higher levels of academic achievement and lifelong attainment due to experiencing higher parental expectations as well as increased financial support. As a result, the second born child is likely to compare him/herself with the first born sibling and develop a greater level of competitiveness. Additionally, this desire to surpass the first born may lead to the development of extrinsically motivated goals. Few research endeavors to date have explored the specific motivational disposition of the second born child with no future siblings. By engaging in this research, a better understanding of the complex interaction between siblings can be ascertained as well as a deeper appreciation for how the familial environment impacts development. Such information can be applied to the educational setting to develop programs more rewarding and salient to second-born individuals, thus increasing their level of academic achievement.
Seventy-two male and female participants took part in the present experiment. Research validated scales were used to assess overall competitiveness in addition to intrinsic and extrinsic motivation. A paired-t test was used to evaluate the data and compare the differences between the two groups. Although the results do not support the hypotheses, there were a number of limitations that may have served to restrict the scope of the data. The theoretical implications of the results and suggestions for future research will be discussed.<br>B.S.<br>Bachelors<br>Sciences<br>Psychology
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Humfeld, Keith Daniel. "A High Order Correction of the Energy of a One Dimensional Model of an H2+ Molecule." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/30958.
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The ground state electron wavefunction of some molecules has a non-zero angular momentum about the internuclear axis. Molecular rotational momentum can couple with this angular momentum, splitting the energy degeneracy of the two directions of motion about the internuclear axis. Performing a Born-Oppenheimer approximation of such a system will break the relevant energy degeneracy at eighth order. This degeneracy breaking is known as L-doubling.<br>Master of Science
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Singh, Suresh. "A Reappraisal of the Uppsala model's Order of Entry Hypothesis based on International Entries and Exits by American Firms since 1965." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1309222801.
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Pham, Denise, and Pernilla Ekberg. "Narcissism och syskonplacering hos gymnasieelever." Thesis, Växjö University, School of Social Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-2121.
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<p>Abstract</p><p>The aim of this present study was to investigate whether there is a relationship between birth order and the personality trait narcissism using 181 individuals from Finnveden High School in Värnamo (115 females, 60 males, mean age 17, sd=0,94), in the context of the proposal of Sulloway (1996) that personality is influenced by the specialized nich-es siblings adopt in the quest for access to parental resources. A questionnaire which in-cludes Narcissistic Personality Inventory test, Birth order test and also Rosenberg’s self-esteem test in order to investigate if it might has an impact on narcissistic personality trait, was used. Results showed that there was no significant relationship between birth order and narcissism, however, a significant relationship between narcissism and self-esteem was found. Furthermore, there was a significant relationship between narcissism and the individual’s relationship with the mother. In conclusion, there was no direct rela-tionship between birth order and narcissism. Our hypothesis was falsified and no support for Sulloways theory was found.</p>
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Sopena, Moros Arturo. "Etude des effets relativistes en régime d’interaction non-linéaire entre les molécules et les impulsions laser brèves dans les domaines de fréquences XUV et X mous." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0131.
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Le développement des sources XUV intenses du type laser à électrons libres (LEL) et génération d’harmoniques d’ordre élevé (GHOE) en régime femtoseconde (fs) et sub-fs permet l’investigation des processus non-linéaires ultra rapides dansl’interaction laser-matière. Dans le contexte de l’étude de la dynamique de la photoionisation moléculaire aux temps ultra-brefs, la résolution directe de l’équation de Schrödinger dépendante du temps (ESDT) s’est révélée cruciale pour l’interprétationdes observations expérimentales. Dans cette thèse, nous présentons des calculs ab-initio pour la photo-ionisation de H2 en impulsion ultra-brève UV et X. On s’intéressera plus particulièrement aux processus non-linéaires impliquant deux photons,à leur rôle dans le couplage dynamique électron-noyaux ainsi qu’aux effets liés aux corrections à l’approximation dipolaire (AD).Notre approche théorique est basée sur la méthode spectrale, elle nécessite la détermination des états quantiques de la molécule isolée. Ces états sont calculés dans l’approximation Born-Oppenheimer (BO) dans le contexte de la méthode d’interaction de configuration, en s’appuyant sur la théorie des collisions pour traiter les continua et sur le formalisme de Feshbach pour calculer les états autoionisants. Dans le traitement de l’interaction avec le rayonnement, nous nous basons sur un développement multipolaire du vecteur potentiel du champ en jauge de Coulomb, dont nous conservons les termes correspondant à l’AD et aux effets de retard jusqu’à l’ordre O(1/c). Finalement, nous utilisons des approches perturbatives et nonperturbatives pour obtenir l’amplitude de transition liée à l’ionisation, à partir de laquelle on calcule les sections efficaces, les spectres de photoélectrons et les distributionsangulaire dans le référentiel de la molécule [...]<br>The development of intense XUV sources through free-electron lasers (FELs) and high-order harmonic generation (HHG) in the femtosecond (fs) and sub-fs domains provides a unique tool to investigate non-linear ultrafast laser-matter interaction. In the study of the dynamics of molecular photoionization at ultrashort timescales, the Time-Dependent Schrödinger Equation (TDSE) has been crucial for the interpretation of experimental observations. In this thesis, we present results for ab initio calculations of H2 photoionization with UV/X-ray ultrashort laser pulses. We focus on the study of non-linear processes involving two photons and their role in the coupled electron-nuclear dynamics they induce and their study beyond the dipole approximation (DA). Our theoretical approach is based on a spectral method, which requires determining the quantum states of the field-free molecule. These states are calculated in the Born-Oppenheimer approximation employing a configuration interaction scheme together with multichannel scattering theory to determine for the treatment of continuum states, and the Feshbach partitioning formalism to account for autoionization. We resort to a multipolar expansion of the vector potential in the Coulomb gauge, from which we keep the terms corresponding to DA and retardation effects up to O(1/c), to account for the interaction with radiation. Finally, we make use of perturbative and non-perturbative propagation schemes to obtain transition amplitudes from which we can extract cross-sections, photoelectron spectra (PES), and molecular frame angular distributions (MFPADs).In the first part of the results, we demonstrate the coherent control of ionization and dissociation achieved by filtering the higher harmonics in an attosecond pulse train (APT) in an XUV pump-UV probe scheme. By solving the TDSE in DA including electronic and nuclear motion, we are able to extract nuclear and electronic kinetic energy release (KER) spectra to analyze the main ionization pathways as afunction of the delay between pump and probe. We then discuss the effect of harmonic filtering in manipulating one-photon against two-photon ionization yields, dissociative ionization channels, and asymmetries in the MFPADs. In the second part of the results of the thesis, we report the first calculations of Stimulated Raman Scattering (SRS) and Stimulated Compton Scattering (SCS) in H2 with intense X-ray laser fields. These non-linear phenomena consist in the absorption of a photon and the subsequent stimulated emission of a less energetic one leaving the molecule in an excited state (SRS) or effectively ionizing it (SCS). Theoretically, the inclusion of effects beyond DA becomes mandatory. We begin by investigating the relative role of the dipole (A.P) and non-dipole (A2) interaction terms through a perturbative study of the Raman cross-section. The role of the high energy electronic continuum in the partial cancellation of the dipole contribution is also analyzed. We then present results from SRS and SCS calculations using ultra-short pulses in which we compare the relative contribution of the dipole and non-dipole routes as a function of the photon energy. We assert the validity of perturbation theory by directly comparing SRS calculations with results obtained by solving the TDSE. In SCS, the interference between dipole and non-dipole routesproduces asymmetries in the MFPADs, which we analyze. Special attention is givento the effect of molecular orientation.Finally, we study SCS with two colors, focusing on the effect of the angle between the pulse propagation directions. As seen in atoms, non-dipole effects are enhanced for counter-propagating pulses. We also investigate the effect of color separation in energy
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Lee, Youseung. "Traitement quantique original des interactions inélastiques pour la modélisation atomistique du transport dans les nano-structures tri-dimensionnelles." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0345.
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Le formalisme des fonctions de Green hors-équilibre (NEGF pour « Non-equilibrium Green’s function) a suscité au cours des dernières décennies un engouement fort pour étudier les propriétés du transport quantique des nanostructures et des nano-dispositifs dans lesquels les interactions inélastiques, comme la diffusion des électrons-phonons, jouent un rôle significatif. L'incorporation d'interactions inélastiques dans le cadre du NEGF s’effectue généralement dans l'approximation auto-cohérente de Born (SCBA pour « Self-consistent Born approximation) qui représente une approche itérative plus exigeante en ressources numériques. Nous proposons dans ce travail de thèse une méthode efficace alternative dite LOA pour (« Lowest Order Approximation. Son principal avantage est de réduire considérablement le temps de calcul et de décrire physiquement la diffusion électron-phonon. Cette approche devrait considérablement étendre l'accessibilité de l'utilisation de codes atomistiques de transport quantique pour étudier des systèmes 3D réalistes sans faire à des ressources numériques importantes<br>Non-equilibrium Green’s function (NEGF) formalism during recent decades has attracted numerous interests for studying quantum transport properties of nanostructures and nano-devices in which inelastic interactions like electron-phonon scattering have a significant impact. Incorporation of inelastic interactions in NEGF framework is usually performed within the self-consistent Born approximation (SCBA) which induces a numerically demanding iterative scheme. As an alternative technique, we propose an efficient method, the so-called Lowest Order Approximation (LOA) coupled with the Pade approximants. Its main advantage is to significantly reduce the computational time, and to describe the electron-phonon scattering physically. This approach should then considerably extend the accessibility of using atomistic quantum transport codes to study three-dimensional (3D) realistic systems without requiring numerous numerical resources
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Cervetti, Pierre-Dominique. "Du bon usage de la contractualisation en droit de la propriété intellectuelle." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM1023.
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La contractualisation est une tendance contemporaine qui traverse de nombreuses branches du droit. Elle est un procédé de régulation impliquant la participation des acteurs privés à l'élaboration et à l'évolution du droit. Cette thèse a pour objet d'en vérifier la pertinence et d'en déterminer la portée en droit de la propriété intellectuelle, domaine dominé par l'ordre public, mais sujet à une perte profonde de légitimité. Traduisant aussi bien un recul de l'ordre public qu'une véritable dynamique de normativité, la contractualisation s'illustre sur deux niveaux. D'abord, dans le rapport contractuel, la contractualisation permet au titulaire d'un droit subjectif de négocier l'exercice de ses prérogatives individuelles et de conférer, au mieux offrant, une certaine liberté, une faculté ou un pouvoir d'agir qu'il pourra exercer en lieu et place de son cocontractant. Elle est alors un vecteur renouvelé des droits subjectifs. Ensuite, à l'échelon supérieur, la contractualisation apparaît comme un nouveau mode de régulation. Les acteurs des milieux professionnels sont associés à l'élaboration de la règle de droit, soit par délégation, soit par incitation. Cette contractualisation complémentaire s'inscrivant au cœur du droit objectif se destine à produire des normes autorégulées reposant tout à la fois sur l'idée de flexibilité et d'adhésion volontaire. Ces normes privées seront enfin réceptionnées dans l'ordre juridique à la condition qu'elles réalisent un équilibre entre l'utilité économique de l'aménagement proposé et la valeur sociale portée par la règle du droit imposé<br>The contractualization is a contemporary trend which crosses numerous branches of the law. As a process of regulation, it implies the participation of the stakeholders in the elaboration and the evolution of the law. This thesis aims at verifying its relevance and determining its impact in intellectual property law, domain dominated by the law and order, but subject to a deep loss of legitimacy. Reflecting a withdrawal of the law and order and a real dynamics of rule-making, the contractualization covers two levels. First of all, in the contractual relationship, the contractualization allows the holder of a subjective right to negotiate the exercise of its individual prerogatives and to confer a certain freedom and power to act that he can practice instead of his cocontracting party. In this case, the contractualization is presented as a vector of subjective rights. Then, in the upper level, the contractualization appears as a new mode of regulation. The stakeholders are associated to the elaboration of the law, either by delegation, or by incentive. This additional contractualization intends to produce private standards basing quite at the same time on the idea of flexibility and voluntary consent. These private standards will finally be received in the legal order assuming that they realize a balance between the economic utility of the proposed arrangement and the social value carried by compulsory rule. In this second prospect, the contractual standard appears as a legal model which should be encouraged, halfway between the spontaneous legal rule and the negotiated legal rule
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BURCKEL, SERGE. "Le bon ordre des tresses positives." Caen, 1995. http://www.theses.fr/1995CAEN2003.
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Le lien entre les tresses et l'algebre distributive donne un ordre total sur les tresses. Cette these donne une caracterisation combinatoire de cet ordre restreint aux tresses positives. Nous montrons la coincidence de cet ordre avec une relation definie a partir d'une representation des mots de tresses par des arbres. Cette methode nous permet de demontrer que l'ordre sur les tresses positives est un bon ordre et d'en calculer le type. De plus ce travail permet de definir une nouvelle forme normale sur les tresses positives et un algorithme pour le probleme de mots. On donne aussi un algorithme de calcul du rang de toute tresse positive dans ce bon ordre. On peut aussi noter que la representation des mots par des arbres donne un bon ordre sur le monoide libre qui pourrait avoir d'autres applications
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CARAFFA, BERNARD Daniela. "Equations aux dérivées partielles elliptiques du quatrième ordre avec exposants critiques de Sobolev sur les variétés riemanniennes avec et sans bord." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00003179.
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L'objet de cette thèse est l'étude, sur les variétés riemanniennes compactes $(V_n,g)$ de dimension $n>4$, de l'équation aux dérivées partielles elliptique de quatrième ordre $$(E)\; \Delta^2u+\nabla [a(x)\nabla u] +h(x)u= f(x)|u|^(N-2)u$$ où $a$, $h$, $f$ sont fonction $C^\infty $, avec $f(x)$ fonction constante ou partout positive et $N=(2n\over((n-4)))$ est l'exposant critique. En utilisant la méthode variationnelle on prouve dans le théorème principal que l'équation $(E)$ admet une solution $C^((5,\alpha))(V)$ $0<\alpha<1$ non nulle si une certaine condition qui dépend de la meilleure constante dans les inclusion de Sobolev ($H_2\subset L_(2n\over(n-4))$) est satisfaite. De plus on montre que si $a$ et $h$ sont des fonctions constantes bien précisées la solution de l'équation est positive et $C^\infty(V)$. Lorsque $n\geq 6$, on donne aussi des applications du théorème principal. Dans la dernière partie de cette thèse sur une variété riemannienne compacte à bord de dimension $n$, $(\overline(W)_n,g )$ nous nous intéressons au problème : $$ (P_N) \; \left\lbrace \begin(array)(c) \Delta^2 v+\nabla [a(x)\nabla u] +h(x) v= f(x)|v |^(N-2)v \; \hbox(sur)\; W \\ \Delta v =\delta \, , \, v = \eta \;\hbox(sur) \;\partial W \end(array)\right.$$ avec $\delta$,$\eta$,$f$ fonctions $C^\infty (\overline (W))$ avec $f(x)$ fonction partout positive et on démontre l'existence d'une solution non triviale pour le problème $(P_N)$.
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Rieß, Alexander [Verfasser]. "Model Order Reduction Based Simulation and Optimization of Large Bore Internal Combustion Engines / Alexander Rieß." Aachen : Shaker, 2015. http://d-nb.info/1074088212/34.
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Ismatullah. "Analysis of space-borne antennas by higher-order method of moments and inverse equivalent current methods." kostenfrei, 2010. https://mediatum2.ub.tum.de/node?id=977261.
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Bonhoff, Hannes. "The influence and significance of cross-order terms in interface mobilities for structure-borne sound source characterization." Berlin Universitätsbibliothek Technische Universität Berlin, 2010. http://d-nb.info/100330401X/34.
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Pequignot, Yann. "Better-quasi-order : ideals and spaces." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC270.
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Cette thèse se situe dans les domaines de la combinatoire, de la théorie des ordres et de la théorie descriptive. La première contribution concerne la théorie des bons quasi-ordres (wqo) et des meilleurs quasi-ordres (bqo). Le résultat principal est la preuve d'une conjecture, énoncée par Pouzet en 1978 dans sa thèse d'état, qui établit que tout wqo dont l'ensemble des idéaux non principaux ordonnés par inclusion forme un bqo est alors lui-même un bqo. La preuve repose sur de nouveaux résultats, qui allient la combinatoire et la topologie, au sujet des fonctions d'un front vers un espace métrique compact. La seconde contribution de cette thèse traite de la complexité topologique dans le cadre des espaces To à base dénombrable. Dans le cas de l'espace de Baire, le quasi-ordre de Wadge est un wqo sur les sous-ensembles Boréliens qui a suscité énormément d'intérêt. Cependant cette relation de réduction par fonctions continues s'avère bien moins satisfaisante pour d'autres espaces d'importance tels que la droite réelle, comme l'ont fait notamment remarquer Hertling, Schlicht et Ikegami. Nous proposons de conserver la continuité et d'affaiblir la notion de fonction pour celle de relation. Pour ce faire, nous utilisons la notion de représentation admissible étudiée en « Type-2 theory of effectivity » initiée par Weihrauch. Nous introduisons alors le quasi-ordre de réduction par relations relativement continues et montrons que celui-ci à la fois raffine les hiérarchies classiques de complexité topologique et forme un wqo sur les sous-ensembles Boréliens de chaque espace quasi-Polonais<br>This thesis deals with combinatorics, order theory and descriptive set theory. The first contribution is to the theory of well-quasi-orders (wqo) and better-quasi-orders (bqo). The main result is the proof of a conjecture made by Maurice Pouzet in 1978 his thèse d'état which states that any wqo whose ideal completion remainder is bqo is actually bqo. Our proof relies on new results with both a combinatorial and a topological flavour concerning maps from a front into a compact metric space. The second contribution is of a more applied nature and deals with topological spaces. We define a quasi-order on the subsets of every second countable To topological space in a way that generalises the Wadge quasi-order on the Baire space, while extending its nice properties to virtually all these topological spaces. The Wadge quasi-order of reducibility by continuous functions is wqo on Borel subsets of the Baire space, this quasi-order is however far less satisfactory for other important topological spaces such as the real line, as Hertling, Ikegami and Schlicht notably observed. Some authors have therefore studied reducibility with respect to some classes of discontinuous functions to remedy this situation. We propose instead to keep continuity but to weaken the notion of function to that of relation. Using the notion of admissible representation studied in Type-2 theory of effectivity, we define the quasi-order of reducibility by relatively continuous relations. We show that this quasi-order both refines the classical hierarchies of complexity and is wqo on the Borel subsets of virtually every second countable To space - including every (quasi-)Polish space
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Véron, Emmanuel. "Synthèse et étude structurale de la gehlénite au bore Ca2Al2-xBxSiO7 : mécanisme de substitution B/AI et ordre local." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00703476.
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Dans cette thèse, nous décrirons les effets structuraux (structure moyenne et à l'ordre local) engendrés par la substitution de l'aluminium par du bore dans la gehlénite (Ca2Al2-xBxSiO7). Les modifications des environnements atomiques à courtes et moyennes distances ont pu être déterminées grâce à une analyse poussée par diffraction sur poudre et à l'utilisation des dernières techniques de RMN haute résolution en phase solide. La première partie du manuscrit donne une description complète de la structure du minéral non substitué Ca2Al2SiO7. L'ensemble des 7 environnements de l'aluminium a été décrit par une simulation combinée de spectres RMN MAS et MQMAS 27Al acquis à différents champs et attribué à l'aide d'expériences d'édition spectrale. L'existence de liaisons Al-O-Al a été démontrée. Par ailleurs, la détermination de la proportion des unités Q3(2Al) nous a permis d'accéder à l'enthalpie de mise en ordre Al/Si dans ce système. Le mécanisme de substitution Al/B et l'évolution structurale de la solution solide Ca2Al2-xBxSiO7 (0 x 2), synthétisée par cristallisation de verres de même composition, ont été caractérisés par affinements Rietveld de données collectées par diffraction des rayons X et des neutrons. Des observations effectuées par RMN MAS sur les trois noyaux du système (27Al, 29Si et 11B) nous ont permis de compléter ces résultats. Un nouveau borosilicate de calcium de formule CaSi1/3B2/3O8/3, appartenant au diagramme de phase Ca2Al2SiO7-Ca2B2SiO7, a pu être identifié et synthétisé. Sa structure a été déterminée in situ et ab initio en combinant des techniques de diffraction, de microscopie électronique en transmission et de résonance magnétique nucléaire.
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Bonhoff, Hannes [Verfasser]. "The influence and significance of cross-order terms in interface mobilities for structure-borne sound source characterization / Hannes Bonhoff." Berlin : Universitätsbibliothek Technische Universität Berlin, 2010. http://d-nb.info/100330401X/34.
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Mattei, Jean-Gabriel. "Structure et ordre chimique dans les nanoparticules bimétalliques : cas du système immiscible Fe-Bi." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1926/.
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L'association de deux métaux dans un même nanomatériau permet de combiner les effets de taille et de mélange à même de susciter de nouvelles propriétés, différentes de celles attendues dans le massif, et donc de nouvelles fonctions. Cette association donne cependant lieu à toute une variété d'organisation atomique et de distribution des éléments allant de la solution solide aux domaines ségrégés en passant par les alliages ordonnés. L'investigation de la structure et de l'ordre chimique dans les nanosystèmes bimétalliques est essentielle à la compréhension de leurs propriétés. Ce travail est dédié à comprendre comment s'organise dans une nanoparticule le système fer-bismuth, totalement immiscible dans le massif et qui réunit deux métaux de propriétés très différentes. Nous avons étudié la structure et l'ordre chimique de nanoparticules bimétalliques Fe-Bi synthétisées par voie de chimie douce et leur évolution suivant les différents paramètres de la synthèse. Cette étude s'appuie sur une combinaison de différentes techniques expérimentales permettant d'analyser la structure de façon statistique par les techniques de rayons X : EXAFS et WAXS, comme localement par des analyses de microscopie électronique à haute résolution. Le couplage avec différentes techniques d'analyses chimiques permet aussi d'étudier les gradients de composition du coeur vers la surface. En effet, les techniques de spectroscopies associées à la microscopie électronique en transmission, EDX et EELS, ont permis d'identifier localement la présence des espèces chimiques tandis que l' XPS et l'Auger nous ont renseigné sur l'environnement chimique des espèces présentes au niveau de la surface<br>Combining two metals in the same nanomaterial allows to combine size and mixing effects to create new properties different from those expected in the bulk, and thus new functions. However, this association gives rise to a variety of atomic organizations and elemental distribution of from solid solution to fully segregated domains going through ordered alloys. Investigating the structure and chemical order in bimetallic nanosystems is thus essential to understand their properties. This work aims at understanding how the iron-bismuth system organizes in a nanoparticle, knowing that this system is fully immiscible in the bulk and that these two metals have completely different properties. We studied the structure and chemical order in Fe-Bi bimetallic nanoparticles synthesized by a soft chemistry route as well as their evolution according to various parameters of the synthesis. This study uses a combination of different experimental techniques to analyze the structure statistically by X-ray techniques as EXAFS and WAXS, as well as locally by high resolution electron microscopy. Techniques suitable for chemical analyses were also used to check the occurrence of compositional gradients from the core to the surface of the particle. Indeed, spectroscopy techniques associated with transmission electron microscopy, EDX and EELS, allowed us to identify locally the presence of chemical species while XPS and Auger provided information on the chemical environment of species present at the surface
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Nwesaty, Waleed. "LPV/Hinf Contrôle utilisé à consevoir des gestion énergetique à bord des véhicules électriques." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT087/document.
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La conception d'une stratégie de gestion des flux de puissance au bord des véhicules électriques de puissance moyenne est considérée, dont le système d'alimentation est composé de différentes sources électriques : pile à combustible, batterie et super-condensateur. Chacune des sources est spécialisée à travailler dans une certaine zone fréquentielle, i.e., la pile à combustible fourni sa puissance en bas fréquence, tandis que le super-condensateur jeu son rôle en haute fréquence, la batterie fournissant la parti moyenne fréquence. Le système est bilinéaire ; il est transformé par linéarisation dans un système linéaire à des paramètres variants. A cette fin, nous proposons les techniques de commande multi-variable robuste de type LPV (linear parameter varying)/Hinf afin de spécifier la dynamique du courant de chaque source dans sa zone fréquentielle de préférence, en contribuant ainsi à la prolongation de sa durée de vie. Chaque source électrique est couplée avec un convertisseur DC-DC, les trois convertisseurs étant couplés en parallèle à un bus DC commun qui alimente le moteur électrique du véhicule jouant le rôle de la charge. La tension de ce bus DC doit être maintenue autour une valeur désirée. Les trois sources sont coordonnées pour fournir la puissance demandée par la charge quel que soit le cycle de conduite. Nous proposons également une méthode de réduction model pour simplifier le contrôleur LPV/ Hinf, qui sera adapté à l'implémentation pratique. Le système complet est simulé numériquement sur MATLAB/Simulink et réalisé pratiquement en utilisant deux cycles des conduites : le cycle européen normalisé (NEDC) et un cycle de conduite proposé par IFSTTAR (Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux)<br>In this thesis the problem of multi-source power sharing strategy within electric vehicles is considered. Three different kinds of power sources { fuel cell, battery and supercapacitor } compose the power supply system, where all sources are current-controlled and paralleled together with their associated DC-DC converters on a common DC-link. The DC-link voltage must be regulated regardless of load variations corresponding to the driving cycle. The proposed strategy is a robust control solution using a MIMO LPV/Hinf controller which provides the three current references with respect to source frequency characteristics. The selection of the weighting functions is guided by a genetic algorithm whose optimization criterion expresses the frequency separation requirements. A reduced-order version of the LPV/Hinf controller is also proposed to handle an embedded implementation with limited computational burden. The nonlinear multi-source system is tested by using two different types of driving cycles: the New European Driving Cycle (NEDC), the driving cycle of IFSTTAR (Institut Francais des Sciences et Technologies des Transports, de l'Amenagement et des Reseaux). Simulation and real-time application results show good performance in supplying the load at constant DC-link voltage according to user-configured frequency-separation power sharing strategy
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Caraffa, Daniela. "Equations aux dérivées partielles elliptiques de quatrième ordre avec exposants critiques sur les variétés riemanniennes compactes avec et sans bord." Paris 6, 2003. https://tel.archives-ouvertes.fr/tel-00003179.
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Freitas, Ana Paula Corrêa de Oliveira. "Práticas educativas parentais em relação ao filho único e ao primogênito em famílias com dois filhos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/15406.
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O presente estudo teve como objetivo examinar eventuais diferenças das práticas educativas parentais com relação a filhos únicos e primogênitos de famílias com dois filhos. Participaram do estudo 22 famílias, das quais 12 com filhos únicos e 10 com dois filhos. As famílias foram emparelhadas conforme o nível sócio-econômico e pela idade e sexo dos filhos únicos e primogênitos. A idade dos filhos únicos variou entre 4,6 e 6,1 anos (M=5,5; dp=0,51) e a dos primogênitos entre 4,3 e 6,3 anos (M=5,1; dp=0,78). As mães e pais dos dois grupos responderam a uma entrevista sobre práticas educativas parentais. As entrevistas foram submetidas à análise de conteúdo. Contrariando a hipótese inicial do estudo, o teste do qui-quadrado somente revelou diferença marginalmente significativa nas práticas de mães e pais com relação ao filho único. De maneira geral, verificou-se semelhança nas práticas educativas entre mães e pais em ambos os grupos de famílias. Os resultados são discutidos à luz da literatura, com vistas a entender os fatores que podem estar contribuindo para explicar as semelhanças das práticas educativas utilizadas para filhos únicos e primogênitos.<br>The aim of this study was to examine eventual differences in parental child-rearing practices related to only child and first born of two children families. Twenty two families participated in this study, 12 only-child families and 10 two-children families. Families were matched according to socioeconomic level, age and sex of only child and first born. Only children’s age ranged from 4,6 to 6,1 years (M=5,5; sd=0,51) and first borns were aged from 4,3 to 6,3 years (M=5,1; sd=0,78). Mothers and fathers of both groups were interviewed about parental child-rearing practices. Answers were content-analyzed. The hypothesis of the study was not supported. According to chi-square test marginally significant differences were obtained in maternal and paternal child-rearing practices related to only child. Results indicated agreement between mother’s and father’s childrearing practices in both groups. Issues described as determinants of childrearing practices are discussed considering the role of the family in child development.
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Dos, Santos Lauriane. "Faire justice aux marges : une ethnographie à bord des "tribunaux spéciaux itinérants" du Brésil (État de l'Amapá, région amazonienne)." Thesis, Paris, EHESS, 2019. http://www.theses.fr/2019EHES0164.
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Cette thèse revient sur la mise en place des « tribunaux spéciaux itinérants » (juizados especiais itinerantes) dans le Brésil contemporain (de 1996 à nos jours). Mobiles et spécialisés dans le traitement des dits « petits litiges » entre citoyen.ne.s – conflits de famille, de voisinage ou de terres – ces derniers sont chargés de faire parvenir l’institution judiciaire de l’État dans les espaces les plus éloignés d’elle : d’un point de vue géographique, mais aussi social et culturel. Instaurés après la période dictatoriale, durant le processus de re-démocratisation du régime, ces services judiciaires gratuits devaient permettre un accès démocratisé à la justice étatique, notamment pour les catégories les plus pauvres et marginalisées de la société. L’enquête suit le parcours de l’un des premiers tribunaux de ce type à avoir été mis en place à l’échelle du pays. Dans l’État de l’Amapá (région amazonienne), près de la Guyane et du Suriname, tous les deux mois, juges et médiateurs de justice quittent leurs bureaux du centre-ville pour entreprendre des voyages de plusieurs jours voire semaines, naviguant sur l’Amazone jusqu’aux villages et hameaux les plus lointains de leur circonscription. Sur place, ils administrent les conflits entre habitant.e.s, en délivrant une justice voulue rapide, efficace et conciliatoire. La thèse repose sur une enquête de terrain étalée sur cinq ans dans cette partie amazonienne du Brésil. En lisant (les archives), en écoutant (lors d’entretiens) et en observant (par l’ethnographie) les agents de justice au quotidien, il devient possible d’appréhender au concret le travail judiciaire qu’ils mettent en œuvre dans ces espaces. À l’audience comme dans les interactions ordinaires entre agents de justice et justiciables, ce n’est pas alors seulement l’accès au droit qui est fourni comme ressource aux habitant.e.s : c’est aussi un travail d’encadrement juridique et d’ajustement moral des vies qui s’opère. En s’appuyant sur un matériau diversifié qui restitue les représentations et les pratiques des agents, les analyses montrent ainsi comment l’institution judiciaire saisit les vies quotidiennes qui se déroulent dans ces espaces, dans leurs moindres aspects. En intervenant dans l’ajustement des rapports à soi et aux autres, et en redéfinissant, au cas par cas, les manières d’être et de vivre, l’institution judiciaire révèle alors ce qu’elle fait de plus essentiel à la société, pour autant qu’elle est elle-même structurée par des rapports sociaux qui la dépassent, et qu’elle participe à reproduire<br>The thesis looks back at the establishment of the “special circuit courts” (juizados especiais itinerantes) in contemporary Brazil (from 1996 to now). Those are mobile courts that are specialized in “small dispute” settlement and the so-called "small claims" of the citizens – implying family, neighborhood or even land issues. They are aimed to ensure a presence of the judicial institution of the State in the spaces that are the most distant from it: both in a geographical and in a socio-cultural way. They have been created after the autocratic period, during the process of re-democratization of the regime, in order to allow a broader access to State justice for the poorest and the most marginalized parts of society, by providing them new free legal servicesThis research follows the path of one of the first courts of this type to be set up across the country. In the state of Amapá (region of Amazon), near French Guiana and Suriname, every two months, judges and conciliators of justice leave their offices in the city center to undertake journeys of several days or even weeks, sailing on the Amazon to the most remote villages and hamlets in their constituency. Once arrived in those localities, they settle the conflicts the inhabitants may have, by delivering what they define as a fast, effective and conciliatory justice. The thesis is based on a five-years field research in this Amazonian part of Brazil. By reading (the archives), by listening (during interviews) and by observing daily (through ethnography) the agents of justice, one can analyze in very concrete terms the judicial work they implement in the spaces they visit. At the hearing, as during the ordinary interactions between agents of justice and litigants, it is not only the access to law and justice which is provided as a resource to the inhabitants : it is also a legal shaping of lives and a moral adjustment of local social behaviors that takes place.Then the analyzes emphasize on the representations as on the practices of the judicial agents, by using both a diverse and qualitative data base. It shows how the judicial institution grasps the local daily lives in the visited villages. By intervening in the adjustment of relationships, both with oneself and with others, and by redefining locally the ways of being and living, the judicial institution then reveals itself and its central function in the social and moral and political regulation of society, provided that it is itself structured by social relations that go beyond it, and that it also reproduces in some way
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Jerems, Frank. "The magnetic and magnetoelastic properies of meld-spun MbFe2 based alloys and their temperature dependencies." Thesis, University of Hull, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484232.
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Cisternino, Marco. "A parallel second order Cartesian method for elliptic interface problems and its application to tumor growth model." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2012. http://tel.archives-ouvertes.fr/tel-00690743.
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Cette thèse porte sur une méthode cartésienne parallèle pour résoudre des problèmes elliptiques avec interfaces complexes et sur son application aux problèmes elliptiques en domaine irrégulier dans le cadre d'un modèle de croissance tumorale. La méthode est basée sur un schéma aux différences fi nies et sa précision est d'ordre deux sur tout le domaine. L'originalité de la méthode consiste en l'utilisation d'inconnues additionnelles situées sur l'interface et qui permettent d'exprimer les conditions de transmission à l'interface. La méthode est décrite et les détails sur la parallélisation, réalisée avec la bibliothèque PETSc, sont donnés. La méthode est validée et les résultats sont comparés avec ceux d'autres méthodes du même type disponibles dans la littérature. Une étude numérique de la méthode parallélisée est fournie. La méthode est appliquée aux problèmes elliptiques dans un domaine irrégulier apparaissant dans un modèle continue et tridimensionnel de croissance tumorale, le modèle à deux espèces du type Darcy . L'approche utilisée dans cette application est basée sur la pénalisation des conditions de transmission a l'interface, afin de imposer des conditions de Neumann homogènes sur le bord d'un domaine irrégulier. Les simulations du modèle sont fournies et montrent la capacité de la méthode à imposer une bonne approximation de conditions au bord considérées.
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Shrestha, Kiran (Engineer). "Electrical Conduction Mechanisms in the Disordered Material System P-type Hydrogenated Amorphous Silicon." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc700106/.
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The electrical and optical properties of boron doped hydrogenated amorphous silicon thin films (a-Si) were investigated to determine the effect of boron and hydrogen incorporation on carrier transport. The a-Si thin films were grown by plasma enhanced chemical vapor deposition (PECVD) at various boron concentrations, hydrogen dilutions, and at differing growth temperatures. The temperature dependent conductivity generally follows the hopping conduction model. Above a critical temperature, the dominant conduction mechanism is Mott variable range hopping conductivity (M-VRH), where p = ¼, and the carrier hopping depends on energy. However, at lower temperatures, the coulomb interaction between charge carriers becomes important and Efros-Shklosvkii variable hopping (ES-VRH) conduction, where p=1/2, must be included to describe the total conductivity. To correlate changes in electrical conductivity to changes in the local crystalline order, the transverse optical (TO) and transverse acoustic (TA) modes of the Raman spectra were studied to relate changes in short- and mid-range order to the effects of growth temperature, boron, and hydrogen incorporation. With an increase of hydrogen and/or growth temperature, both short and mid-range order improve, whereas the addition of boron results in the degradation of short range order. It is seen that there is a direct correlation between the electrical conductivity and changes in the short and mid-range order resulting from the passivation of defects by hydrogen and the creation of trap states by boron. This work was done under the ARO grant W911NF-10-1-0410, William W. Clark Program Manager. The samples were provided by L-3 Communications.
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Martin, Sébastien. "Contribution à la modélisation de phénomènes de frontière libre en mécanique des films minces." Phd thesis, INSA de Lyon, 2005. http://tel.archives-ouvertes.fr/tel-00011279.
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Cette thèse est consacrée à l'analyse mathématique, à la modélisation et au calcul scientifique des problèmes d'interface dans des milieux fluides de faible épaisseur. Les problèmes d'interface liquide-gaz de type cavitation apparaissent dans la plupart des mécanismes lubrifiés et leur modélisation a toujours été un sujet très discuté en tribologie. Celle-ci a initialement utilisé (et utilise encore) des inéquations variationelles mais l'inadéquation de ce modèle qui est non conservatif a conduit à introduire de manière heuristique une modélisation basée sur un système hyperbolique-elliptique. Cependant, dans le cadre de cette nouvelle modélisation, des problèmes ouverts apparaissent, dès lors que l'on s'intéresse à des conditions de fonctionnement plus réalistes. Parmi ceux-ci, on peut citer :<br />1/ la possibilité d'utiliser ce modèle en présence de rugosités. Il s'agit, du point de vue mathématique, de l'homogénéisation d'une équation en pression-saturation, <br />2/ la prise en compte de la déformation élastique de surfaces solides due à la pression hydrodynamique du fluide adjacent. Pour cela, il est habituel en élastohydrodynamique (E.H.D.) de modifier les coefficients de l'équation de l'écoulement par l'introduction d'un terme intégral (déformation du type Hertz). La modélisation de la cavitation intervient dans la partie hydrodynamique et, par suite, sur l'ensemble du couplage.<br />3/ la possibilité de justifier ou non ce modèle à partir d'une description bifluide rigoureuse de l'écoulement et d'en déduire ainsi une procédure de calcul du frottement associé à l'écoulement mince.<br /><br />Nous étudions ces différents aspects qui permettent de justifier la pertinence du modèle de cavitation considéré.
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Bonneu, Florent. "Processus ponctuels spatiaux pour l'analyse du positionnement optimal et de la concentration." Phd thesis, Toulouse 1, 2009. http://tel.archives-ouvertes.fr/tel-00465270.
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Les processus ponctuels spatiaux forment une branche de la statistique spatiale utilisée dans des domaines d'application variés (foresterie, géo-marketing, sismologie, épidémiologie...) et développée par de récents travaux théoriques. Nous nous intéressons principalement dans cette thèse à l'apport de la théorie des processus ponctuels spatiaux pour des problèmes de positionnement optimal, ainsi que pour la définition de nouveaux indices de concentration basés sur les distances en économétrie. Le problème de positionnement optimal s'écrit souvent comme un problème d'optimisation prenant en compte des données geo-référencées auxquelles peuvent être associées des caractéristiques. Pour prendre en compte l'aléa, nous considérons ces données issues d'un processus ponctuel spatial pour résoudre un problème de positionnement stochastique plus réaliste qu'un modèle déterministe. A travers l'étude du positionnement optimal d'une nouvelle caserne de pompiers dans la région toulousaine, nous développons une méthode de résolution stochastique permettant de juger de la variabilité de la solution optimale et de traiter des bases de données volumineuses. L'approche implémentée est validée par des premiers résultats théoriques sur le comportement asymptotique des solutions optimales empiriques. La convergence presque sure des solutions optimales empiriques de l'étude de cas précédente est obtenue dans un cadre i.i.d. en utilisant la théorie de Vapnik-Cervonenkis. Nous obtenons aussi la convergence presque sure des solutions optimales empiriques, dans un cadre plus général, pour un problème de positionnement dérivé du problème de transport de Monge-Kantorovich. Nous nous intéressons ensuite à des indices de concentration basés sur des distances en économétrie. Ces indices de concentration peuvent s'écrire comme des estimateurs de caractéristiques du second ordre de processus ponctuels marqués. Nous définissons ensuite un estimateur non-paramétrique d'une nouvelle caractéristique d'un processus ponctuel spatial marqué définissant ainsi un nouvel indice de concentration améliorant ceux déjà existants. Dans un cadre asymptotique avec fenêtre d'observation bornée, notre estimateur est asymptotiquement sans biais.
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Van, Dreese Barbara Jane. "A first-born child's behavioral reaction to the birth of a sibling in relation to self-care abilities, receptive language abilities, and preparation for the birth." 1985. http://catalog.hathitrust.org/api/volumes/oclc/13143368.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1985.<br>Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 53-55).
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HEJLKOVÁ, Kristýna. "Vliv pořadí sourozenců v rodině pro nasměrování profesní orientace." Master's thesis, 2007. http://www.nusl.cz/ntk/nusl-46449.
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In my paper I would like to focus on comparing of two groups of siblings in a different sibling positiron and their presisposition for the choice of the occupation and point out the qualities that an individual carries from the childhood and which can influence the choice of their future occupation. I want to make out and compare the changes in this theory in the course of a decade. According to the statistics I have assumed that the firs-bor will choose still occupations demanding accuracy, high conce thein perfectionism and thein will to achieve success. On the contrary, the youngest ones are supposed to be free thinkers and chaose flexible and independent occupations. Both the hypothes have proved true. For collection the date this thesis I use questionnaire. It was filled up with randon representatives with different age. I made a research by comparing the representatives of the oldest and the youngest siblings and partially also middle ones.
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KOROTVIČKOVÁ, Blanka. "Vliv sourozenecké konstelace na studijní a profesní aspiraci žáků." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-111876.
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The thesis "Sibling Constellation Effects on Learning and Career Aspirations of Pupils" is aimed at the description of a relationship between birth order and personality development. It also deals with the general characteristics of sibling constellation and its historical development. It points out the importance of sibling constellation in human life and presents the personality description with regard to birth order in relation to parents, siblings, peers, education and occupation. The thesis also involves the research results of birth order effects on learning and career specialization of grammar school pupils. This main part is enriched with the information about the aspiration rate of secondary school and university students. The data were obtained through three similar questionnaires distributed on above-mentioned educational levels during February and March 2012.
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[Verfasser], Ismatullah. "Analysis of space-borne antennas by higher-order method of moments and inverse equivalent current methods / Ismatullah." 2010. http://d-nb.info/100228709X/34.
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Navarro, Khali. "Reconciling Order and Progress: Auguste Comte, Gustave Le Bon, Emile Durkheim, and the Development of Positivism in France, 1820-1914." Master's thesis, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6146.
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This thesis discusses the philosophy of positivism in nineteenth century France. Based on an empirical vision of society, positivism advocated values of rationality, progress, and secularization. In that way, it stood as one of the defining systems of thought of the modern era. I discuss, however, an undercurrent of anxiety about those same values. Positivism's founder, Auguste Comte, argued that all sciences would become unified and organized under universal principles and empirical standards. He viewed the human mind as becoming more rationalized throughout history. In his later career, however, he argued that rationalism was a destructive force and that a new form of secular religion as necessary to establish morality and order. I argue that this transition from science to religion represents an underlying anxiety of the nineteenth century. Intellectuals from different sides of the political spectrum viewed progress as positive, but also limited. They argued that something beyond science, in the realm of the religious, the metaphysical, or the subjective, was necessary for society. They expressed these concerns through the language of gender. Comte argued that women would be at the center of his religion. They would socialize and moralize men, making them part of a new unified, pacifist and orderly social whole.
I also discuss two later intellectuals, social psychologist Gustave Le Bon and pioneering sociologist Emile Durkheim. Le Bon represented the fin-de-siecle rejection of positivism. He began with positivist principles, but later argued that humanity was irrational and violent. He viewed the modern masses as a powerful force which threatened to destroy civilization. The other figure, Durkheim, rejected Le Bon's form of nationalist right-wing thought and formed theories of social harmony, altruism, and a solidarity. He sought to reconcile egalitarian republican principles with positivist science. Despite their diverging theories, however, Le Bon and Durkheim employed similar assumptions about modernity and gender. Le Bon argued that European men were superior, and that all other groups shared an undeveloped mentality. Durkheim argued that men were social while women were simpler and mentally limited.
Their views, far from establishing an unproblematic hierarchy of gender and race, in fact expressed anxieties about the state of modernity. They identified women, the lower classes, and other societies with values of simplicity, unity, and tradition. They identified the modern, Western male individual with the problems of modern society: excessive rationalization, instability, and secularization. This sense of ambivalence about modernity reveals the central importance of positivism to understanding nineteenth century thought. Positivism sought to reconcile seemingly antithetical principles of order with progress, individualism with social unity, and morality with rationalization. In doing so, it established anxieties about the forces of change. Positivists advocated the most modern of principles, and sought to further the progress of civilization, but also identified those rationalized forces as problems in need of control. Positivism thus established its own undoing, which would come at the beginning of the twentieth century. In that era, intellectuals rejected purely scientific visions of the world in favor of subjective thought. I locate the origins of that rejection at the very foundations of positivist theory.<br>M.A.<br>Masters<br>History<br>Arts and Humanities<br>History
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Jorge, Flávio Miguel da Silva. "High-order Earth-satellite propagation channel measurement and modelling at Ka and Q/V-bands." Doctoral thesis, 2020. http://hdl.handle.net/10773/28937.
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This work focuses on high-capacity spectral-efficient Earth-space microwave
communication links, supporting the access to wider and less congested
bandwidths and providing the required technological advances on radiowave
propagation for the design and operation of system-technologies improving the
spectral efficiency, proposing the operation of frequency-reuse schemes and
polarization diversity techniques at Ka- and Q/V-bands.
Because the suitable planning, successful deployment and effective, spectralefficient
and interference-free, operation of all space-borne systems and services
is necessarily related and directly dependent, although not exclusively, on the
propagation channel conditions, this work provides a comprehensive and
systematic approach intending the relevant propagation phenomena
characterization and understanding, modelling and mitigation.
It is proved that there is a bigger operational margin for the operation of the
abovementioned system-technologies than what may be believed by considering
the international recommended models. Major challenges are envisaged,
specially in what concerns the ice-induced depolarization that is more persistent
and takes longer than the corresponding rain-induced effects. Nevertheless, their
mitigation is possible for which the depolarization shall be the controlling variable.
The time lag of 15 minutes is identified as the best trade-off between affordable
time and achievable gain in the framework of a time diversity scheme.<br>Este trabalho foca-se em links de comunicação Terra-espaço em microondas
espectralmente eficientes e de elevada capacidade, suportando o acesso a
larguras de banda maiores e menos congestionadas e ofereçendo os avanços
tecnológicos necessários em termos de propagação de ondas de rádio para o
projeto e operação de tecnologias de sistema que visam o uso otimizado do
espectro, propondo a operação de esquemas de reuso de frequência e de
técnicas de diversidade de polarização nas bandas Ka e Q/V.
Porque o adequado planeamento, a implementação bem sucedida, bem como
a efetiva operação, espectralmente eficiente e livre de interferências, de todos
os sistemas e serviços espaciais está necessariamente relacionada e
diretamente dependente, ainda que não exclusivamente, das condições do
canal de propagação, este trabalho oferece uma abordagem completa e
sistemática pretendendo a caracterização, compreensão, modelação e
mitigação dos fenómenos de propagação relevantes.
É provado existir uma maior margem operacional para a operação das
tecnologias acima mencionadas do que aquela que se acredita existir
considerando os modelos internacionais recomendados. São previstos maiores
desafios, especialmente no que concerne à despolarização causada por gelo
que é mais persistente e que dura mais tempo do que os correspondentes
efeitos causados por chuva. De qualquer forma, a sua mitigação é possível e
para a qual a despolarização deverá ser a variável de controlo. O intervalo de
tempo de 15 minutos é identificado como o melhor compromisso entre tempo
acessível e ganho alcançável no contexto de um esquema de diversidade
temporal.<br>Programa Doutoral em Engenharia Eletrotécnica
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Ilivitsky, Susan. "Making sense of sudden personal transformation: a qualitative study on people’s beliefs about the facilitative factors and mechanisms of their abrupt and profound inner change." Thesis, 2011. http://hdl.handle.net/1828/3383.
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Sudden personal transformation (SPT) was defined as a subjectively reported,
positive, profound, and lasting personal change that follows a relatively brief and
memorable inner experience. Although such change has been described in numerous
biographies, works of fiction, and religious and scholarly texts, a consistent definition
and systematic program of research is lacking in the psychological literature. Moreover,
almost nothing is known about what causes such change from the subjective point of
view of individuals who have experienced it first hand. This study used semi-structured
interviews and thematic analysis to explore the common beliefs of three participants
about the factors that facilitated and the mechanisms that caused their SPT. Findings
reveal that all participants reported a life transition, feeling miserable, feeling exhausted,
feeling unable to resolve adverse circumstances, reaching a breaking point, and support
from others facilitated their individual SPT’s. All participants also indicated that a
formalized activity or ceremony as well as a process outside of their conscious control
(either a higher power or a deep inner wisdom) produced or caused their SPT’s.
Implications for future research and counselling practice are discussed.<br>Graduate
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Charette, Julie. ""Je me ferai l'homme" : le religieux et son rôle chez Gaston Miron." Thèse, 2006. http://hdl.handle.net/1866/18221.
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(7543412), Kartik Kapoor. "EXPERIMENTALLY VALIDATED CRYSTAL PLASTICITY MODELING OF TITANIUM ALLOYS AT MULTIPLE LENGTH-SCALES BASED ON MATERIAL CHARACTERIZATION, ACCOUNTING FOR RESIDUAL STRESSES." Thesis, 2019.
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<p>There is a growing need to understand the
deformation mechanisms in titanium alloys due to their widespread use in the
aerospace industry (especially within gas turbine engines), variation in their
properties and performance based on their microstructure, and their tendency to
undergo premature failure due to dwell and high cycle fatigue well below their
yield strength. Crystal plasticity finite element (CPFE) modeling is a popular
computational tool used to understand deformation in these polycrystalline alloys.
With the advancement in experimental techniques such as electron backscatter
diffraction, digital image correlation (DIC) and high-energy x-ray diffraction,
more insights into the microstructure of the material and its deformation
process can be attained. This research leverages data from a number of
experimental techniques to develop well-informed and calibrated CPFE models for
titanium alloys at multiple length-scales and use them to further understand
the deformation in these alloys.</p>
<p>The first part of the research utilizes
experimental data from high-energy x-ray diffraction microscopy to initialize
grain-level residual stresses and capture the correct grain morphology within
CPFE simulations. Further, another method to incorporate the effect of grain-level
residual stresses via geometrically necessary dislocations obtained from 2D
material characterization is developed and implemented within the CPFE
framework. Using this approach, grain level information about residual stresses
obtained spatially over the region of interest, directly from the EBSD and
high-energy x-ray diffraction microscopy, is utilized as an input to the model.</p>
<p>The second part of this research involves
calibrating the CPFE model based upon a systematic and detailed optimization routine
utilizing experimental data in the form of macroscopic stress-strain curves
coupled with lattice strains on different crystallographic planes for the α and
β phases, obtained from high energy X-ray diffraction experiments for multiple
material pedigrees with varying β volume fractions. This fully calibrated CPFE
model is then used to gain a comprehensive understanding of deformation
behavior of Ti-6Al-4V, specifically the effect of the relative orientation of
the α and β phases within the microstructure.</p>
<p>In the final part of this work, large and highly
textured regions, referred to as macrozones or microtextured regions (MTRs),
with sizes up to several orders of magnitude larger than that of the individual
grains, found in dual phase Titanium alloys are modeled using a reduced order
simulation strategy. This is done to overcome the computational challenges
associated with modeling macrozones. The reduced order model is then used to
investigate the strain localization within the microstructure and the effect of
varying the misorientation tolerance on the localization of plastic strain
within the macrozones.</p>