Dissertations / Theses on the topic 'UN thread'
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Hlavinka, Miloslav. "Rekonstrukce protitlakové parní turbiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231818.
Full textKehler, Nicole. "Coordinating Humanitarian Assistance: A Comparative Analysis of Three Cases." Virginia Tech, 2004. http://hdl.handle.net/10919/9938.
Full textMaster of Public and International Affairs
RADULY, EVA. "A critical discourse analysis of Twitter messages of three international humanitarian organisations about Refugees - UNHCR, UNICEF, WFP." Thesis, Malmö universitet, Fakulteten för kultur och samhälle (KS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-21547.
Full textDrolet, Frédéric. "Cohérence et synchronisation dans un environnement virtuel multi-sensoriel réparti." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25659/25659.pdf.
Full textGutierrez, Moreno Cédric. "Three essays on the behavioral foundations of entrepreneurial entry." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLH003.
Full textExplaining why individuals enter into entrepreneurship has been challenging. In this thesis, I take a behavioral perspective and analyze the effects on entrepreneurial entry of behavioral mechanisms that have been understudied in the entrepreneurship literature. The first essay proposes to disentangle the effects on market entry of two mechanisms that may have been confounded: overconfidence and attitude toward ambiguity. This essay highlights the critical role of ambiguity attitude on the decision to enter a market, particularly when the result depends on one’s skills, such as entry into entrepreneurship. The very nature of entrepreneurship is to invest capital and time with the hope of receiving future financial benefits. I therefore argue that understanding entrepreneurs’ temporal preferences for time and money can provide new insights on the determinants of entry into entrepreneurship. While intertemporal choice involving money has been studied extensively in the behavioral literature, very few studies have analyzed the way people discount time, despite the fact that it is a scarce and valuable resource. The second essay investigates this issue in a laboratory experiment. Finally, using a lab-in-the-field experiment, the third essay analyzes temporal preferences for money and time of a comparable sample of future entrepreneurs and future managers
Venturi, Matteo. "Applicazione del modello di concorrenza ad Attori nello sviluppo di applicazioni Web: un caso di studio." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9595/.
Full textMecheri, Christopher. "Sviluppo di un modello orientato al controllo di un catalizzatore trivalente per applicazioni GDI." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14805/.
Full textKeita, Abou. "Modèles statistiques précoces et robustes pour l’estimation de la concentration d’agents biologiques dans un système de surveillance en continu dans l’environnement." Thesis, Rouen, INSA, 2014. http://www.theses.fr/2014ISAM0017/document.
Full textThis thesis is part of the ANR project, Génétic EquipemeNt for biothrEat enviroNmental Analysis and SurveillancE (GENEASE). This project focuses on the study of a system for monitoring and continuous analysis of biological environment. This analysis is done by a molecular biology method for the detection and identificatio of varions biological agents simultaneously. The device referred must integrate aIl the functions of sample collection of the rendering of the result. This project is essentially part of the axis "crisis management" since it focuses on the study of a mobile and portable equipment for the biological detection and identification. Our task i to develop a system that detects (or not) the presence of the species and to estimate its concentration. This estimation is based on fluorescence data using the number of the reference cycle (or break time). It is therefore to integrate into the same approach to the discrimination detect and the régression to qualify. In addition, the aim is to build a statistical model which from the single observation of the fluorescence of a drop, calculates an estimatation of the reference cycle and deduce an estimation of the concentration of the species to qualify while minimizing the delay at the detection. The work is to present a statistical model to determine continuous time fror the moment we observe this reference cycle on the fluorescence
Colotti, Manuel Enrique. "Un sistema di Session Tracking e Threat Evaluation per Applicazioni Web basato su Honeytoken." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23871/.
Full textForget, Julien. "Un langage synchrone pour les systèmes embarqués critiques soumis à des contraintes temps réel multiples." Toulouse, ISAE, 2009. https://hal.archives-ouvertes.fr/tel-01942421.
Full textKerneis, Gabriel. "Continuation-Passing C : Transformations de programmes pour compiler la concurrence dans un langage impératif." Phd thesis, Université Paris-Diderot - Paris VII, 2012. http://tel.archives-ouvertes.fr/tel-00751444.
Full textBartak, John R. "Mitigating the MANPADS threat : International Agency, U.S., and Russian efforts /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FBartak.pdf.
Full textThesis Advisor(s): Mikhail Tsypkin, Edward J. Laurance. Includes bibliographical references (p. 73-79). Also available online.
Wadsten, Johan. "Våld på uppdrag av FN - Vilka situationer hotar internationell fred och säkerhet? : En tolkning av artikel 39 i FN-stadgan." Thesis, Uppsala universitet, Juridiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233311.
Full textConiasse-Brioude, Delphine. "Déterminants psychologiques de l'acceptation et du refus de participer à un essai clinique destiné à prévenir la maladie d'Alzheimer en population âgée fragilisée." Phd thesis, Université Toulouse le Mirail - Toulouse II, 2011. http://tel.archives-ouvertes.fr/tel-00646721.
Full textBenjelloun, Touimi Zakia. "Diffraction par un réseau 1-périodique de R3." Paris 13, 1988. http://www.theses.fr/1988PA132004.
Full textLEFEVRE, ANNE. "Evita : un systeme de securite anti-collision pour un engin mobile utilisant une modelisation de l'environnement obtenue par apprentissage." Paris 6, 1987. http://www.theses.fr/1987PA066478.
Full textLeclerc, Camille. "Biodiversité endémique insulaire face aux changements globaux : état des lieux dans un contexte de conservation." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS507.
Full textGlobal changes, because of human activities, are associated with numerous population declines and species extinctions, which are especially pronounced in island systems. The important biodiversity of such ecosystems is particularly vulnerable to anthropogenic pressures because of several characteristics (e.g. island syndrome, low functional redundancy, island geographical isolation). Despite this increased vulnerability, few studies have so far looked at these systems as a study model for assessing patterns of threats to the different facets of diversity (taxonomic, functional, and phylogenetic). However, such work would improve our understanding of islands threats. In this sense, the aim of this PhD thesis is to describe patterns of insular endemic diversity in the current context of global changes and in a future climate change context, by exploring different facets of diversity. The purpose of this work is to highlight potential conservation priorities for these particularly vulnerable ecosystems. We have addressed all of this thesis work on a large scale using two databases of worldwide islands and endemic species. In a first part, we characterized threats to island ecosystems at a global scale and also explored their distributions within different taxonomic groups and island regions. In a second part, we analyzed the impact of threats on the functional component of island endemic biodiversity. In a third part, we have identified priority areas for insular endemic biodiversity representativeness and conservation across different dimensions of biodiversity and explored their levels of protection through protected areas and threats affecting them. In a last part, we studied the future vulnerability of islands and endemic biodiversity to climate change by 2050 based on endemic mammals. In the light of our results (identification of major threats whose importance varies according to the taxonomic groups, the island regions and also the dimensions of biodiversity considered), we discussed the implications of global changes for island endemic biodiversity in a conservation context. This PhD thesis reveals the importance of integrating multiple threats and diversity dimensions for global changes and conservation approaches
Bouteca, Maurice. "Fracturation hydraulique calcul de propagation d'une fracture induite dans un massif rocheux /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37603363t.
Full textWollbrink, Stephan [Verfasser]. "A Violation of International Law as a Necessary Element of a "Threat to the Peace" under the UN Charter / Stephan Wollbrink." Baden-Baden : Nomos Verlagsgesellschaft mbH & Co. KG, 2014. http://d-nb.info/1108809421/34.
Full textGuan, Hao. "Un cadre de conception pour les PSS basé sur l'ingénierie simultanée tridimensionnelle." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0173/document.
Full textThe world industrial economy has been witnessing to step into service economyduring last two decades. Evidence can be easily found to prove it, such as the shift ofmore and more manufacturers from traditional product centric logic intoservice oriented logic, sharing economy’s growth in popularity over the last severalyears, changing their business model and renting the usage of the p roduct theymanufacture, etc. Product Service Systems (PSS), under this context, are seen as onesolution to help companies to address the servitization process. PSS captures a lot ofpractitioners and researchers’ attention because of its potential to sat isfy customers’requirements of more economical, more c ustomized and more sustainable services inthe modern service economy context. However, in the current marketplace, most PSSsolutions are pushed by providers based on their own capabilities and their internalpotential for innovations and unfortunately, they most of the time ignore real usagesand values for beneficiaries. In this context, functions of offerings (different scenariosof combinations of products and services) are sometimes useless and ov erlapped and alarge amount of waste is being produced when producing and implementing this kindof solution
Sanders, Raphael P. "Louis Cahuzac's Clarinet Music: an Examination of Selected Works, with Three Recitals and a Solo Performance of Selected Works by Debussy, Reinecke, Bloch, Stravinsky, Mozart and Others." Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc278517/.
Full textZgainski, François-Xavier. "Un pré processeur pour l'électromagnétisme, l'électromécanique et l'électroacoustique." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0127.
Full textMontiel, A. Katty, B. Henry Maldonado, and M. Edith Luz Gouveia. "Amenaza por inestabilidad de las laderas en la cuenca del río Mocoy. Andes venezolanos." Pontificia Universidad Católica del Perú. Centro de Investigación en Geografía Aplicada, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/119889.
Full textCon la intención de establecer una zonificación de los niveles de amenaza geomorfológica porinestabilidad de laderas de la cuenca hidrográfica del río Mocoy, se efectuó un análisis de las condiciones biofísicas, mediante el método heurístico y se identificaron las variables espaciales de mayor incidencia en la dinámica local, tratadas en ARC/INFO y con propuestas metodológicas asociadas a la matriz de análisis espacial de Leopold y el sistema de transparencias de MacHarg. Se logró representar tres niveles de amenaza: baja, moderada y alta, las cuales fueron correlacionadas con los procesos morfogenéticos actuantes, la estructura geológica y litología, así como también con el uso de la tierra de esta importante cuenca del flanco norandino vene- zolano. El análisis de los mecanismos implícitos en el colapso de material geológico, así como la estimación sobre la tendencia futura y detección de las áreas de mayor amenaza, constituyen las bases para una adecuada mitigación del problema de procesos de ladera peligrosos y el aportede sedimentos al sistema fluvial del río Mocoy.
Pooter, Hélène de. "Le droit international face aux pandémies : vers un système de sécurité sanitaire collective ?" Thesis, Paris 1, 2013. http://www.theses.fr/2013PA010343.
Full textIn the face of pandemics, is international law organized as a "system of collective health security" (foregoing excessive unilateral measures - guaranteed by the community through joint action - upholding State rights to adopt necessary individual measures)? The study of instruments adopted by the WHO (International Health Regulations, Pandemic Influenza Preparedness Framework), of unilateral acts of the UN (resolutions of the General Assembly, the Security Council and the Economic and Social Council), of cooperation between international organizations and of the WTO's Agreements (GATT, SPS Agreement and TRIPS Agreement) reveals that the answer to each segment of the question is positive. However, one cannot ignore the highly imperfect result of the fight against pandemics. If there are undeniable indices which illustrate the existence of a nascent system of collective health security, international law in the face of pandemics is nevertheless thus far characterized by an agglomerate of fragments at odds with a coherent legal edifice
Camonin, Martine. "Mephisto : un outil de validation de modèles tridimensionnels." Nancy 1, 1987. http://www.theses.fr/1987NAN10149.
Full textAubel, Laforgue Sylvie. "Un nouveau média pour l'aménagement urbain intégrant un système d'information géographique et un outil de représentation vériste et tridimensionnelle du paysage : application à l'étude du projet urbain de Saint Pierre de Chartreuse." Grenoble 1, 1997. http://www.theses.fr/1997GRE10168.
Full textYahiaoui, Brahim. "Maillage dynamique tridimensionnel pour la simulation de l'écoulement dans un bassin sédimentaire." Thesis, Troyes, 2013. http://www.theses.fr/2013TROY0034/document.
Full textTo target more profitable oil and gas deposits, the numerical simulation is of growing interest in the oil sector. In this context, two main types of applications are distinguished: reservoir engineering where geological models are defined as static and exploration for the simulation of hydrocarbons formation. The latter application requires dynamic basins models. For this type of simulation, mathematical and numerical modeling has been an important advance in recent years. However, the construction of meshes needed for the simulations is a difficult task in the case of complex and dynamic geometries. The difficulty is reflected by the characteristic of the domain to mesh, which is defined from the mechanics of granular media which are almost incompressible and heterogeneous environments. In addition, the seismic data represent non-implicit surfaces modeling volume blocks. In this context, we focus on Lagrangian hex-dominant mesh generation of basins with complex geometry. The desired mesh must contain a layer of almost hexahedral meshes between two horizons and conform to fault surfaces through these horizons. A novel methodology based on the construction of an unfolded space is introduced. The desired mesh is then seen as a constrained 3D grid in this novel space. Several mesh optimization techniques are also proposed
López, Kristian. "Modelo de acceso y uso de telefonía en un contexto de incertidumbre en los ingresos." Economía, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/117943.
Full textFitriani. "Pre-deployment training of UN women military peacekeepers : a case study analysis of three South-East Asian countries." Thesis, Cranfield University, 2017. http://dspace.lib.cranfield.ac.uk/handle/1826/12020.
Full textRuttle, Mark. "Aspects of a Late Style in Sergei Rachmaninoff's Variations on a Theme of Corelli, Op. 42: a Lecture Recital, together with Three Recitals of Selected Works of J. Brahms, L. v. Beethoven, F. Chopin, C. Debussy, Zoltan Kodaly, M. Moussorgsky, and S. Prokofiev." Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc330593/.
Full textMelin, Carl Victor. "Does the threshold for an ‘armed attack’ within the meaning of Article 51 of the UN Charter leave a state unable to act vis-à-vis an opponent using hybrid warfare strategies?" Thesis, Försvarshögskolan, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-9973.
Full textBaraston, Arnaud. "Prise en compte de la CEM dans une méthodologie de pré-dimensionnement par optimisation déterministe en électronique de puissance : application à un redresseur triphasé aéronautique." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT006/document.
Full textThis thesis deals with the sizing of power electronics using deterministic optimization. In this way, methods to integrate the ElectroMagnetic Compatibility constraints in such process were studied. The case of a three-phase rectifier with EMC filters on both AC and DC sides was considered. A common-mode path creates an interaction between the two filters, thus they have to be sized together. Models of the converter and its components were developed for their sizing by deterministic optimizations. In such conception problem, all the parameters used for describing the system configuration (functional elements values, PWM command strategy and the switching frequency) influence the conducted EMC emissions. Therefore, the modeling of the EMC constraints was integrated in the optimization procedure, which aims the overall weight reduction. Thanks to that, a global approach where EMC filters are sized along with the converter was achieved, whereas it is usually done after the converter conception.The main challenge was the variation of the switching frequency in optimization. Strategies were developed regarding the automatic surveillance of the EMC spectrums in order to drastically reduce their computation times. An innovative formulation of the EMC constraints enabled the optimizations to converge. An automatic procedure for launching multiple deterministic optimizations with random initial parameters allowed us to obtain good optimization results, regarding the constraints and the global weight of the system. In this work, genericity of the modelling approach was a main concern, regarding EMC and the different sizing models. Therefore, the adaptation of the developed methods to other applications should be convenient
Arias, Carlos Andres. "Un paso pa' delante| Notions of middle class economic success in three Salvadoran advertising agencies in the face of dollarization." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1593790.
Full textThis qualitative study explores the evolving notion of economic success among middle class Salvadorans. While initially aimed at the effects of dollarization, the scope was widened to be more inclusive of overall neoliberal practices in El Salvador. In-depth interviews and ethnographic observations were used to understand life as a middle class Salvadoran and the relationship between government practices, including dollarization, and the evolving definition of economic success. Focusing on the individuals in the advertising industry, this study examines the complex factors that influence and determine middle class sentiments regarding their economic status and their point of view on dollarization’s effects on their lives. Additionally, this study considers how opinions and experiences differ along socioeconomic lines, comparing middle class employee experiences with that of upper class CEOs. The study was conducted in San Salvador, El Salvador; the economic and cultural center of El Salvador.
Photopoulos, Raphaël. "Un modèle de liaisons fortes tridimensionnel pour les cuprates supraconducteurs monocouches à base de lanthane." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC215/document.
Full textIn this thesis, we construct a minimal three-dimensional tight-binding model for single-layer La-based cuprate superconductors. It entails eight orbitals, two of them involving apical oxygen ions. Parameter optimization allows to almost perfectly reproduce the three-dimensional conduction band as obtained from DFT. We discuss how each parameter entering this multiband model influences it, and show that the peculiar form of its dispersion severely constraints the parameter values. We then evidence that standard perturbative derivation of an effective one-band model is poorly converging because of the comparatively small value of the charge transfer gap. Yet, this allows us to unravel the microscopical origin of the in-plane and out-of-plane hopping amplitudes. An alternative approach to the computation of the tight-binding parameters of the effective model is presented and worked out. It results that the agreement with DFT is preserved provided longer-ranged hopping amplitudes are retained. A comparison with existing models is performed, too. The Fermi surface, showing staggered pieces alternating in size and shape, is compared to experiment. The density of states is calculated as well. The model is further analyzed through a weak coupling study of magnetic instabilities. It is performed on large clusters and competition between several three-dimensional magnetic instabilities in the hole-doping region of experimental interest is found. We show that the tendency to form a three-dimensional incommensurate spin density wave is strongest in the vicinity of 1/8 doping
Kolářová, Eva. "Vliv přídavku vícesměrně orientované výztuže na mechanické vlastnosti materiálu pro přípravu celkově snímatelných náhrad." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217087.
Full textTelles, Maria Aguayo. "Fuerte Como Acero, Tierno Como un Ángel: A Study of Social/Cultural Capital and Three First-Generation Immigrant Women From Guanajuato Mexico." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145740.
Full textCachay, Maluquish Josselyne Grace, Rivera Arlett Katherin Eguiluz, and Campana Pamela Milagros Villanueva. "Diseño de un plan estratégico para mejorar la gestión administrativa de la empresa TECEME Perú S.A.C." Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1305.
Full textBéclin, Adeline. "L'ancrage corporel et relationnel de la construction subjective de l'enfant face aux écrans : le Jeu de trois figures, un outil pour la relancer la symbolisation." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC162.
Full textOur objective is to provide elements for reflection, based on the psychoanalytic corpus concerning the effects of early exposure to screens on psychic growth. This work focuses on the development of the baby and the young child by offering an analysis of the effects of this digital invasion in the psychological construction and the establishment of attachment. We wanted to approach this issue by firstly addressing the foundations of a child's psyche ; this in order to establish a theoretical framework for reflection and subsequently to better question the impact of screens on early interactions and the subjective construction of the child. From the very beginning a baby is influenced by interactions with its entourage,with in a singular environment. It is on the basic of the seen counters, the quality of its early interactions and the ability of the entourage to adapt the environment to the baby's needs, that the success of the baby's future individualisation will depend. Through our readings, the importance of physical and relational anchoring, appeared to us to be central to the deployment of the psyche. Play seemed to us to be the foundation of this physical and relational anchoring. We therefore thought it necessary for there to be play for the "I" to happen; or, in other words, that playful sharing as part of early interactions, constitutes a determining element in subjective construction. The “three faces” game, a prevention tool for children, has been the support of our clinical research. It offers a place for verbalisation around the many material images that flood the daily lives of children. It makes it possible to start from their physical experience caused by exposure to the screens and move towards a work of symbolisation. Multiple symbolisation such as: pictorial symbolisation ie by encouraging their representative capacity; verbal symbolisation ie by allowing the narrative construction of a story, and sensory motor symbolisation, ie by mobilising the body through the identification of mimics and the "game of pretending". It is at the intersection of these three dimensions-narrative construction, physical engagement and the ability to pretend - that a symbolic work can be engaged for the child. The results of this research show that J3F, adapted to the therapeutic framework, is a relevant tool for relaunching symbolisation processes
Le, guernic Antoine. "Effets sublétaux d'une contamination métallique liée à des rejets miniers uranifères sur l'épinoche à trois épines (Gasterosteus aculeatus L.). Implication dans la susceptibilité envers un stress biologique." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS027.
Full textUranium extraction has resulted in a remobilisation of this actinide into mine surrounding ecosystems. Uses of metal salts during mining site rehabilitation, and the natural presence of metals have increased the metal contamination in hydrosystems submitted to mine tailings.In situ experiments were conducted in two former French uranium mining sites. Three-spined stickleback caging was used to determine the sublethal effects of this metal mixture on this freshwater fish, as well as its effects on fish susceptibility to a sudden biological stress.This pollution, characterised by higher metal concentrations (especially for uranium), has led to an oxidative stress in sticklebacks visible through several biomarkers, and other effects dependent on the study site. The polymetallic contamination has modified the stickleback responses to the biological stress, by preventing their phagocytic and antioxidant responses. This work has reinforced the interest of the caging technique during environmental studies and that of immunomarkers in a multi-biomarker approach
Bernadet, Philippe. "Propriétés spectroscopiques de complexes formes entre un hydracide (HCl, HBr, HI)) et l'oxyde d'éthylène (EO) en matrice d'argon et d'azote : analyse du profil de la bande d'absorption HCl des complexes H(D)Cl:EO et H(D)Cl:dimethylether et étude." Paris 6, 1986. http://www.theses.fr/1986PA066355.
Full textFrini, Marouane. "Diagnostic des engrenages à base des indicateurs géométriques des signaux électriques triphasés." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSES052.
Full textAlthough they are widely used, classical vibration measurements have several limitations. Vibration analysis can only identify about 60% of the defects that may occur in mechanical systems. However, the main drawbacks of vibration measurements are the difficult access to the transmission system in order to place the sensor as well as the consequent cost of implementation. This results in sensitivity problems relative to the position of the installation and the difficulty to distinguish the source of vibration because of the diversity of mechanical excitations that exist in the industrial environment.Hence, the Motor Current Signatures Analysis (M.C.S.A.) represents a promising alternative to the vibration analysis and has therefore been the subject of increasing attention in recent years. Indeed, the analysis of electrical signatures has the advantage of being a technically accessible method as well as inexpensive and non-intrusive to the system. Techniques based on currents and voltages only require the motor’s electrical measurements which are often already supervised for the purposes of the control and the protection of the electrical machines. This process was mainly used for the detection of motors faults such as rotor bars breakage and eccentricity faults as well as bearings defects. On the other hand, very little research has been focused on gear faults detection using the current analysis. In addition, three-phase electrical signals are characterized by specific geometric representations related to their waveforms and they can serve as different indicators providing additional information. Among these geometric indicators, the Park and Concordia transforms model the electrical components in a two-dimensional coordinate system and any deviation from the original representation indicates the apparition of a malfunction. Moreover, the differential equations of Frenet-Serret represent the trajectory of the signal in a three-dimensional euclidean space and thus indicate any changes in the state of the system. Although they have been previously used for bearing defects, these indicators have not been applied in the detection of gear defects using the analysis of electrical current signatures. Hence, the innovative idea of combining these indicators with signal processing techniques, as well as classification techniques for gears diagnosis using the three-phase motor’s electrical current signatures analysis is established.Hence, in this work, a new approach is proposed for gear faults diagnosis using the motor currents analysis, based on a set of geometric indicators (Park and Concordia transforms as well as the properties of the Frenet-Serret frame). These indicators are part of a specifically built fault signatures library and which also includes the classical indicators used for a wide range of faults. Thus, a proposed estimation algorithm combines experimental measurements of electrical signals with advanced signal processing methods (Empirical Mode Decomposition, ...). Next, it selects the most relevant indicators within the library based on feature selection algorithms (Sequential Backward Selection and Principal Component Analysis). Finally, this selection is combined with non-supervised classification (K-means) for the distinction between the healthy state and faulty states. It was finally validated with a an additional experimental configuration in different cases with gear faults, bearing faults and combined faults with various load levels
Brandi, Felipe. "Georges Duby: penser l`histoire. La construction d`un modèle d`histoire sociale (France, 1950-1980)." Doctoral thesis, 2017. http://hdl.handle.net/10362/51879.
Full textThe work of Georges Duby belongs to a specific moment of the evolution of the historical studies in France, distinguished by the effort of a whole historian’s generation to define the paths by which the mental representations would be incorporated as true objects of history. Attempting to incorporate it in the scope of a wider historiographical picture, our purpose is to show that Georges Duby raised, during a quarter of century, a project of social history centered in the dialectics between the material and the mental. We argue that this project finally acted as a model (and as a defense plea of) of the historical exploitation of the immaterial realities. Our analyses is focused on the book Les Trois Ordres ou l’Imaginaire du Féodalisme, that we consider the accomplishment of this social history program whose foundations were set in his thesis on society in the Mâconnais in the 11thand 12th centuries, twenty years early. Dedicated to the social model of the three orders, a subject much in vogue at that time, Les Trois Ordres gives to Georges Duby the opportunity to review more than twenty years of dispute concerning the relationship between history and social sciences. He also could revise the debates concerning the constraining power of mental representations and, furthermore, call into question the image his own generation have inherited of the society that we call “feudal”. We will finally show how Duby’s social history, focused on the links between material infrastructure and mental images, intended to reaffirm the central role of history among social sciences.
Kuo, Chia-Ho, and 郭家和. "Estimation of Litterfall and Soil Organic Carbon Storage un-der Three Habitat Types in Nanjenshan Lowland Rain Forest." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/42036384640886914398.
Full text國立屏東科技大學
森林系所
100
The combined organic and inorganic carbonate in global soil carbon pool is about twice the amount contained in the atmosphere, and 69% of it is re-served in forest soil and litter layers. In this study, soil in litter layer and ground less than 50cm in depth in three different habitats in Nanjen Mountain was collected and divided, according to the depth of collection, into three categories: 0-10cm, 10-30cm and 30-50cm. Litter layer’s biomass and organic carbon content, and the organic carbon content, overall density and stone content of the soil collected from different ground depths were analyzed to calculate the carbon reserves of the litter layers and ground less than 50cm in depth in the three different habitats in Nanjen Mountain. In addition, litterfall during the 10-year period between 1999 and 2010 was also gathered to ana-lyze the long-term changes in the litterfall amount and composition in differ-ent habitats. Also, litterfall’s carbon nutrient content was analyzed to under-stand the carbon return amount of the leaf litter in different habitats. Further-more, bags were installed beside litterfall-collecting nets to find out the de-composition rates and carbon nutrient retention rates of the leaf litter in the three different sites. The results showed that the average amount of the plant litter in Nanjen region over the above-mentioned 10-year period was 4.91±1.85 t ha-1yr-1, and had been declining due to the influence of typhoons. Plant litter was mostly composed of leaves (67%), followed by twigs (20%), and flowers and fruits (13%). The amount of leaf litter varied with terrains, of which valley had the high litterfall amount (about 6.00±1.72 t ha-1 yr-1), fol-lowed by leeward slope (about 5.04±0.73 t ha-1 yr-1) and windward slope (about 4.80±0.94 t ha-1 yr-1). The carbon return amount ranged between 2.45 and 2.96 t ha-1 yr-1. It was found that valley had the highest litterfall decom-position rate of 1.7±1.0 yr-1, followed by leeward slope of 1.4±0.5 yr-1, and windward slope of 1.2±0.6 yr-1. The carbon amount contained in the litter layer and soil in Nanjen Mountain varied from habitat to habitat. In terms of litter layer’s carbon content, windward slope was the highest (1.04±0.14 t ha-1), followed by leeward slope (0.87±0.15 t ha-1) and valley (0.64±0.17 t ha-1). Similarly, the carbon content of the soil collected from ground 0-50cm in depth also varied from site to site, with valley being the highest (306.3 t ha-1), followed by leeward slope (209.3 t ha-1) and windward slope (128.6 t ha-1). The analysis of the areas of different habitats in Nanjen Mountain using geographic information system found that about 57.43% of the region had an inclination of 30∘or above, 42% of the region inclined toward northeast, which happened to be Nanjen Mountain’s windward slope, and the rest 58% were made up of leeward slopes and valleys. The carbon reserve of each habitat can be calculated by multiplying the area of a habitat by its soil carbon content. The carbon pool of the soil collected from ground 0-50cm in depth with valley being the highest (421.28 Kt), followed by leeward slope (269.57 t ) and windward slope (123.94 Kt).Consequently,the overall carbon reserve in the soil in Nanjen Mountain region is estimated at 814.79 Kt.
Sidibé, Abdoul Karim. "Three essays in microeconomic theory." Thesis, 2020. http://hdl.handle.net/1866/24659.
Full textThis thesis is a collection of three articles on microeconomic theory. The first two articles are concerned with the issue of race-to-the-bottom when governments engage in competition for some mobile factor. The third article proposes an extension for the many-to-one matching problem by introducing different-size agents. In the first article, we show how the standard race-to-the-bottom result can be avoided by introducing public good into a tax competition model. Our economy has two jurisdictions populated by perfectly mobile workers divided into two categories: skilled and unskilled. Governments, in pursuit of a Rawlsian objective (max-min), simultaneously announce their plans for investing in public good before deploying a nonlinear income tax schedule. After observing the tax schedules of the governments and their promises to invest in public good, each worker chooses a place of residence and a supply of labour. Thus, governments achieve their redistribution objectives by seeking to attract productive labour through the provision of public goods in addition to favorable taxation policy. We show that there exist equilibria where skilled workers pay a strictly positive tax. In addition, when information on the type of workers is private, there are equilibria for certain parameter values in which unqualified workers receive a net transfer (or subsidy) from the government. In the second article, we investigate how the Bertrand standard price competition with differentiated products could provide useful insight for Citizenship By Investment programs in the Caribbean. We show that when countries can be classified into two types according to the size of their demand, imposing appropriate uniform minimum price and maximum quota brings countries to an efficient outcome that Pareto dominates the Non-Cooperative Nash Equilibrium. Finally. in the third article, we explore an extension of the standard many-to-one matching problem by incorporating different-size agents (refugee families) on the many side of the market, to be assigned to entities (homes) with different capacities on the other side. A specific feature of this model is that it does not allow refugee families to be split between several homes. It is well known that many of the desirable properties of matching rules are unachievable in this framework. We introduce size-monotonic priority ranking over refugee families for each home, that is, a host family (home) would always prefer a greater number of members of refugee families until its capacity constraint binds. We show that a pairwise stable matching always exists under this assumption and we propose a mechanism to find it. We show that our mechanism is strategy-proof for refugees: no refugee family could benefit from misrepresenting his preferences. Our mechanism is also refugees optimal pairwise stable in the sense that there is no other pairwise stable mechanism that would be more profitable to all refugees.
Martorell, Esquivel Karla. "Saberes profesionales de docentes en educación preescolar que laboran con niñez menor de tres años de edad : un estudio en Costa Rica." Thèse, 2016. http://hdl.handle.net/1866/18371.
Full textThis research approaches the universe of the teaching knowledge from the perspective of the professionals who work in Preschool Education in Costa Rica. Its object of study is the problem of the knowledge foundation which is the basis of their work during the care and education of children below three years of age. Consequently, the general objective of the investigation is focused on the identification, according to the very same preschool teachers, of the knowledge required for teaching practice, focusing on: (a) the acquisition sources of their teaching knowledge, (b) the perception that the teachers in Preschool Education deal with the student population from 0 to 3 years, as well as the other necessary knowledge areas to be able to act and (c) to examine how the teachers move that knowledge in the exercise of their profession. This qualitative research was done from a comprehensive approach with the intention to find data and attempt to build and rebuild its meaning. The research took place in Costa Rica. Twenty three female preschool teachers who met the required criteria such as having a university degree, work experience and practice in both the private and public education sectors participated. The methodological instruments provided were a semi-structured interview and the Instructions to Sosia. All the participants answered after signing a free consent letter approved by the Ethics’ Committee of the University of Montreal. Data underwent a process of analysis supported with QdaMiner software and next came the creation of an initial classification and data organization stages, the general reading of the interview results and the assignment of preliminary categories as well as the creation of templates for the final encoding. The results can be seen according to three axes: (1) Knowledge Acquisition Sources, which contemplates those emanating from their personal life history, those from early and continuous education, and those provided by work experience with children less than 3 years of age; (2) Necessary knowledge to be able to work with infants from 0 to 3 years of age, comprising various types of knowledge which include personal and professional life; the knowledge from study disciplines regarding infant development, knowledge about learning theories and several other education-related disciplines; pedagogical knowledge derived from experience, related to educational proposal design, teaching, methodology and the evaluation of infants; work management suitable to the characteristics of the job description, its routine and relations with the family; finally (3) Moving of knowledge in their pedagogical practice, focused on built and reformulated knowledge learned throughout the daily teaching practice. These three axes are comprised by subcategories and after their introduction and discussion, it was possible to notice that knowledge is acquired through the contact and relation available in the different interactional spaces of development with the others, such as professional development and the teaching practice. The highest value from all these sources of knowledge was granted to the professional practice and the teaching experience inside the classroom, which allows the teacher to reformulate, to modify and reshape perceptions of the teaching-learning process. The participants registered a wide range of knowledge pointing towards a complexity of sources in their professional practice which transcends the vision of preschool teachers as “caretakers” and places them as professionals. This has a tremendous repercussion in the educational development of their pupils. In general, teachers´ knowledge is strongly linked with the job context and it is a constant subject to be tested, reflected upon and modified, due to the movement of knowledge in their pedagogical practice. In addition, it is possible to identify the failures, knowledge blanks, targets of criticism and needs that the participants mentioned as key aspects to reflect upon, the relationship between the early and the continuous educational background, just as with the curricular support material and the work conditions. In this way, it is concluded that the research satisfied the set objectives. In addition, it has contributed to the thinking of improvements in preschool teacher training, being a timely opportunity to insert the topic of knowledge as an area for discussion and reflection during the process of knowledge acquisition of the professional teaching practicum.
La investigación aborda el universo de los saberes docentes desde la perspectiva de los profesionales que se desempeñan en educación preescolar en Costa Rica y teniendo como problemática los saberes que conforman la base de su trabajo durante la atención y educación de la niñez menor de tres años de edad. Siendo así, el objetivo general se enfocó en identificar, de acuerdo con las propias docentes, los saberes requeridos para el ejercicio docente, enfocándose en: (a) las fuentes de adquisición de los saberes docentes, (b) la percepción que los docentes de educación preescolar poseen de la población de 0 a 3 años, como de los saberes que necesitan tener en su actuación y (c) examinar cómo los docentes movilizan los saberes en el ejercicio de su profesión. Se trata de una investigación cualitativa de abordaje comprensivo que tiene la intención de encontrar datos con la pretensión de construir y reconstruir sus significados. El contexto de la investigación se dio en Costa Rica. Participaron 23 docentes que cumplieron con los criterios establecidos, como por ejemplo tener formación universitaria, poseer experiencia laboral y trabajar en el sistema tanto público como privado de educación. Como instrumentos metodológicos se utilizaron la entrevista semiestructurada y la instrucción al sosia. Todas las participantes respondieron bajo consentimiento libre aprobado por el Comité de Ética de la Universidad de Montréal. Los datos pasaron por un proceso de análisis que contó con el apoyo del software QdaMiner y la composición de etapas de creación de un sistema de clasificación y organización inicial de los datos, lectura general de las entrevistas y señalización de categorías preliminares, así como la creación de plantillas de codificación final. Los resultados pueden ser vistos de acuerdo con tres ejes: (1) Fuentes de adquisición de los saberes, que contempla los provenientes de su historia de vida personal, los de la formación inicial y continua y los brindados por la experiencia laboral con la niñez menor de tres años; (2) Saberes necesarios para trabajar con infantes de 0 a 3 años de edad, derivando varios tipos de saber que incluyen lo personal y profesional; los saberes disciplinares sobre el desarrollo del infante, los conocimientos sobre teorías de aprendizaje y diversas disciplinas afines a la educación; los saberes pedagógicos derivados de la experiencia, relacionados con el diseño de propuestas, la enseñanza, la metodología y la evaluación de infantes; saber gestionar su trabajo sabiendo las características que este posee, la rutina y las relaciones con la familia; finalmente (3) Movilización de los saberes en su práctica pedagógica, enfocado en los saberes construidos, reformulados y aprendidos en lo cotidiano del ejercicio de la docencia. Estos tres ejes están compuestos por subcategorías y después de su presentación y discusión fue posible notar que los saberes son adquiridos en contacto e interacción proporcionada por los diferentes espacios de desenvolvimiento con los otros, como lo es la formación profesional y la actuación docente. Siendo que la mayor valorización de las fuentes de saber fue otorgada en la práctica profesional y a la experiencia del ejercicio de la docencia dentro del aula, lo que permite reformulaciones, modificaciones y percepciones de enseñanza-aprendizaje. Las participantes registran una amplia gama de saberes que apuntan hacia una complejidad en su ejercicio profesional la cual trasciende la visión de “cuidadoras” y las colocan como profesionales que tienen gran repercusión en el desarrollo educativo de los niños y las niñas. De manera general, los saberes de estas docentes están fuertemente vinculados al contexto del trabajo y son constantemente sometidos a la comprobación, reflexión y modificación, debido a la movilidad en la práctica pedagógica. Además, fue posible identificar las fallas, lagunas, críticas y necesidades que las participantes mencionaron como fundamental para ser repensadas, en lo relacionado con el proceso formativo inicial y continuo, así como el material de apoyo curricular y a las condiciones de trabajo. De esta forma, se concluye que el estudio atendió los objetivos propuestos y además se coloca como una contribución para pensar en mejoras en la formación de docentes que actúan en educación preescolar, siendo la inserción de la temática de los saberes oportuna para el proceso de reflexión sobre las prácticas profesionales.