Mesurer des forts courants alternatifs sur une large bande de fréquences est primordial pour de nombreuses applications dont la surveillance du réseau de distribution électrique et le développement des véhicules électriques. Dans le premier cas, la mesure du courant est nécessaire pour quantifier la qualité du réseau en présence d’harmoniques provenant des énergies renouvelables intermittentes dont le spectre en fréquences est assez large (plusieurs centaines de kilohertz). Dans le second cas, la mesure du courant (jusqu’à plusieurs dizaines d’ampères) intervient dans la quantification du rendement de la chaîne de traction d’un moteur électrique : dans la mesure du courant la prise en compte d’un grand nombre d’harmoniques (jusqu’à 1 MHz) est indispensable pour garantir une connaissance précise du rendement du moteur. Des résistances de faibles valeurs, appelées « shunt », sont alors indispensables pour mesurer des forts courants. Les shunts sont largement utilisés comme étalon de résistance dans les laboratoires de métrologie et les instruments de précision. Leur utilisation nécessite la connaissance préliminaire en fonction de la fréquence des deux paramètres suivants : déphasage de l’impédance du shunt ; variation relative du module de l’impédance du shunt par rapport à la sa valeur de sa résistance en courant continu, ce paramètre est appelé “écart de transposition”. Pour un niveau de courant de 10 A, l’impédance des shunts existants présente de fortes variations en module et phase pour les fréquences supérieures à 100 kHz. De plus, actuellement dans les laboratoires nationaux de métrologie, pour étalonner les shunts au-delà de 1 A les méthodes de mesure utilisées sont d’une part limitées en module à 100 kHz et en phase à 200 kHz et d’autre part elles donnent accès uniquement à un des deux paramètres : module ou phase de l’impédance du shunt. Ce travail de thèse a pour objectif d’étendre jusqu’à 10 A et 1 MHz les possibilités d’étalonnage des capteurs de forts courant et d’améliorer ainsi la traçabilité des mesures en courant alternatif. Nous avons dans un premier temps développé un shunt étalon de 10 A dont la réponse électromagnétique (jusqu’à 10 MHz) et la réponse thermique sont entièrement calculables : à 1 MHz le déphasage et l’écart de transposition sont respectivement de -0,01 mrad et 15 ppm. Dans un second temps, nous avons mis au point une méthode d'étalonnage traçable permettant de mesurer les shunts jusqu’à 10 MHz. La méthode de mesure, basée sur l'utilisation d'un analyseur de réseau vectoriel, permet de mesurer simultanément l’écart de transposition et la phase de l'impédance d'un shunt avec des incertitudes relatives inférieures à 1.10⁻³ à 1 MHz. / Measuring high alternating currents over a wide frequency bandwidth is essential for many applications including the monitoring of the electrical distribution network and the development of electric vehicles. In the first case, current measurement is necessary to quantify the quality of the grid in the presence of harmonics from intermittent renewable energies with a large frequency spectrum (several hundred kilohertz). In the second case, current measurement (up to several tens of amperes) is used to quantify the efficiency of an electric motor's traction chain: in current measurement, it is essential to take into account a large number of harmonics (up to 1 MHz) to ensure an accurate knowledge of the motor's efficiency. Resistors of low values, called "shunt", are then mandatory to measure high currents. Shunts are widely used as a resistance standard in metrology laboratories and precision instruments. Their use requires the preliminary knowledge of the following two parameters according to the frequency: Impedance phase shift; relative variation of the impedance magnitude according to its DC resistance value, this parameter is called “AC-DC difference”. For a current level of 10 A, the impedance of existing shunts shows strong variations in magnitude and phase for frequencies above 100 kHz. In addition, in National Metrology Institutes, to calibrate shunts beyond 1 A the measurement methods currently used are limited in magnitude up to 100 kHz and phase up to 200 kHz; and provide access to only one of the two parameters: magnitude or phase of impedance. The aim of this thesis is to extend the calibration capabilities of high current sensors up to 10 A and 1 MHz and thus improve the traceability of AC current measurements. Firstly, we developed a 10 A shunt standard whose electromagnetic (up to 10 MHz) and thermal responses are fully calculable: at 1 MHz the phase shift and transposition deviation are -0.01 mrad and 15 ppm respectively. Secondly, we developed a traceable calibration method to measure shunts up to 10 MHz. The measurement method, based on the use of a vector network analyzer, allows the AC-DC deviation and impedance phase of a shunt to be measured simultaneously with relative uncertainties less than 1.10⁻³ at 1 MHz.

Nous vivons à l’ère des incertitudes. Au débat épistémologique de la certitude scientifique s’agrègent des incertitudes sociales, politiques, informationnelles qui structurent les controverses dans l’espace social. À l’école, l’enseignement des questions socialement vives (énergie nucléaire, OGM, etc) matérialise ces incertitudes. Comment les indéterminations rencontrées par les enseignantes de sciences reconfigurent leur rapport aux savoirs en jeu dans la controverse et l’idée qu’elles se font de la manière d’enseigner ? J’ai mené mon enquête au sein de deux systèmes éducatifs, l’éducation nationale (enseignantes de SVT) et l’enseignement agricole (enseignantes de différentes disciplines), autour de la question vive de la transition agroécologique. De manière générale, les questions socialement vives placent les enseignantes en insécurité épistémique. Les questions vives les amènent à construire leur point de vue sur le sujet pendant la phase de préparation de cours, voire pendant l’enseignement. Cela implique une reconfiguration de leur posture professionnelle que certaines acceptent, faisant le deuil de la volonté d’exhaustivité épistémique, d’autres ne l’acceptant pas et cherchant à renforcer leur position quant à la maîtrise du savoir. Mon observation des situations de formation – autour de la cartographie de controverse ou de la construction collective d’un scénario pédagogique – montre que certains dispositifs de la démarche d’enquête socio-scientifique permettent d’explorer la complexité de la question. À l’image des scénarios du futur, de véritables outils restent toutefois à concevoir, en complémentarité avec une réelle formation épistémologique et médiatique des enseignantes de sciences et une reconsidération du principe de neutralité. Ce sont là les conditions d’existence d’une éducation aux incertitudes qui puisse donner aux citoyennes les ressources pour se réapproprier des futurs dont la justesse socio-politique serait le véritable horizon. / Appear by now some social, political, informational uncertainties that structure the dynamic of the controversies in the social space. Within classroom, the teaching of socially acute questions (as nuclear energy, GMOs, animal welfare, etc) provides the opportunity to work on these uncertainties. How do the uncertainties encountered by science teachers reconfigure their relation to the knowledge involved in the controversy and the representation they have about science teaching? I investigated in two educational systems, general education (biology teachers) and agricultural education (teachers from different disciplines) around the acute question of agroecological transition. Overall, socially acute questions expose the teachers to epistemic insecurity. Intrinsically, these questions lead them to construct their point of view on the subject during the course preparation or potentially during the teaching activity. It implies a reconfiguration of their professional posture that some of them accept, mourning epistemic completeness, and that others don’t accept, looking for strengthening their position concerning knowledge mastering. My observation of professional training situations – around mapping controversies or developing a pedagogical scenario – shows that some devices of socio-scientific inquiry allow an exploration of the question’s complexity. However, efficient tools have still to be thought or adapted, as scenarios of the future, in complement with a real epistemological and informational training of science teachers. These are the living conditions of an uncertainty education that would give to the citizens resources for a reappropriation of their futures and, finally, create opportunities whose socio-political relevance is the proper horizon.

As metodologias tradicionais de gerenciamento de projetos são caracterizadas como sendo rígidas e adequadas apenas para ambientes de pouca incerteza. No entanto, atualmente cada vez mais projetos são desenvolvidos em ambientes de alta complexidade e maiores incertezas, o que requer formas diferentes de gerenciamento do projeto, menos rígidas e mais flexíveis. Assim, o objetivo deste trabalho é propor um quadro conceitual para o gerenciamento de incertezas em projetos complexos. A abordagem metodológica mescla revisão sistemática da literatura e estudos de caso. O quadro conceitual desenvolvido, baseado na teoria da contingência, sugere que as abordagens de gestão de projetos sob incertezas são, em parte, determinadas pelas características das incertezas existentes. As respostas às incertezas podem ser orientadas à causa ou ao efeito da incerteza, e essas são escolhidas de acordo com a habilidade de influência sobre a causa, que aumenta para incertezas internas e diminui para incertezas externas. Já a flexibilidade da abordagem de gestão de projetos é impactada pelo grau da incerteza. Foram realizados seis estudos de caso, e um caso piloto, em projetos complexos, que mostraram que existe relação entre a origem da incerteza e a habilidade de influência, e entre a habilidade de influência e a orientação das ações. Eles mostraram também como a flexibilidade é importante para o gerenciamento das incertezas do projeto, associando métodos de antecipação, de instrucionismo, como o gerenciamento de riscos e a resiliência, principalmente a capacidade da alta direção assumir a existência de incertezas. Os estudos de caso evidenciaram que quanto maior o nível de incerteza do projeto, maior é a flexibilidade necessária. A dissertação apresenta ainda as limitações do estudo e as sugestões para trabalhos futuros. / Traditional project management methodologies are considered rigid and suitable only for environments of little uncertainty. However nowadays increasing number of projects is being developed in high complexity and uncertainty environment, requiring different approaches for project management: less rigid and more flexible. Thus, the purpose of this paper is to present a framework for managing projects under uncertainties, through a systematic literature review. The developed framework, based on the contingency theory, suggests that approaches for project management under uncertainty are, in part, determined by the characteristics of the existing uncertainties. The responses for uncertainty can be driven by the cause or consequence of the uncertainties and those are chosen according to the ability to influence the cause, which is higher for internal uncertainties and lower for external uncertainties. The flexibility of the project management approach, in its turn, is impacted by the uncertainty degree. Six case studies and a pilot case study were conducted in projects with complexity. The cases showed that there is a relation between the source of the uncertainty and the ability to influence, and between the ability to influence and the orientation of the responses. They also pointed out the importance of flexibility to manage uncertainties, combining prediction methods, the instructionism, such as using risk management, and resilience, especially the ability of the management to admit the existence of uncertainties. The cases also indicated that the highest is the project uncertainty, the highest is the need for flexibility. The paper also presents the limitation of the research, and suggestions for further works.

As metodologias tradicionais de gerenciamento de projetos são caracterizadas como sendo rígidas e adequadas apenas para ambientes de pouca incerteza. No entanto, atualmente cada vez mais projetos são desenvolvidos em ambientes de alta complexidade e maiores incertezas, o que requer formas diferentes de gerenciamento do projeto, menos rígidas e mais flexíveis. Assim, o objetivo deste trabalho é propor um quadro conceitual para o gerenciamento de incertezas em projetos complexos. A abordagem metodológica mescla revisão sistemática da literatura e estudos de caso. O quadro conceitual desenvolvido, baseado na teoria da contingência, sugere que as abordagens de gestão de projetos sob incertezas são, em parte, determinadas pelas características das incertezas existentes. As respostas às incertezas podem ser orientadas à causa ou ao efeito da incerteza, e essas são escolhidas de acordo com a habilidade de influência sobre a causa, que aumenta para incertezas internas e diminui para incertezas externas. Já a flexibilidade da abordagem de gestão de projetos é impactada pelo grau da incerteza. Foram realizados seis estudos de caso, e um caso piloto, em projetos complexos, que mostraram que existe relação entre a origem da incerteza e a habilidade de influência, e entre a habilidade de influência e a orientação das ações. Eles mostraram também como a flexibilidade é importante para o gerenciamento das incertezas do projeto, associando métodos de antecipação, de instrucionismo, como o gerenciamento de riscos e a resiliência, principalmente a capacidade da alta direção assumir a existência de incertezas. Os estudos de caso evidenciaram que quanto maior o nível de incerteza do projeto, maior é a flexibilidade necessária. A dissertação apresenta ainda as limitações do estudo e as sugestões para trabalhos futuros. / Traditional project management methodologies are considered rigid and suitable only for environments of little uncertainty. However nowadays increasing number of projects is being developed in high complexity and uncertainty environment, requiring different approaches for project management: less rigid and more flexible. Thus, the purpose of this paper is to present a framework for managing projects under uncertainties, through a systematic literature review. The developed framework, based on the contingency theory, suggests that approaches for project management under uncertainty are, in part, determined by the characteristics of the existing uncertainties. The responses for uncertainty can be driven by the cause or consequence of the uncertainties and those are chosen according to the ability to influence the cause, which is higher for internal uncertainties and lower for external uncertainties. The flexibility of the project management approach, in its turn, is impacted by the uncertainty degree. Six case studies and a pilot case study were conducted in projects with complexity. The cases showed that there is a relation between the source of the uncertainty and the ability to influence, and between the ability to influence and the orientation of the responses. They also pointed out the importance of flexibility to manage uncertainties, combining prediction methods, the instructionism, such as using risk management, and resilience, especially the ability of the management to admit the existence of uncertainties. The cases also indicated that the highest is the project uncertainty, the highest is the need for flexibility. The paper also presents the limitation of the research, and suggestions for further works.

Depuis plusieurs années, la perte de chance suscite l’intérêt du juge administratif et de la doctrine publiciste. Le premier, qui en a largement développé le champ dans le contentieux de la responsabilité administrative, a fait évoluer la méthode de réparation de cet instrument en s’inspirant de l’exemple judiciaire. La seconde a tenté d’identifier les justifications de l’emploi de la perte de chance en s’appuyant sur l’incertitude du préjudice et sur celle du lien de causalité. Or l’analyse de la jurisprudence montre qu’en dépit de la pluralité des aléas justifiant l’usage de la perte de chance, celui-ci s’inscrit dans un cadre unique, caractérisé par une incertitude causale. La diversité apparaît ailleurs, au stade de l’indemnisation. Selon la méthode retenue – la logique du tout ou rien ou la réparation proportionnelle – la perte de chance change d’apparence. Prenant la forme tantôt d’une présomption de causalité, tantôt d’un préjudice spécifique, elle permet de surmonter l’incertitude causale de deux manières différentes. Les hésitations actuelles du juge administratif autour de l’indemnisation de la perte de chance témoignent de la difficulté à trancher entre l’une ou l’autre des deux possibilités de réparation et, partant, entre les deux outils qui y sont attachés. Toutefois, le type d’aléa sous-tendant l’emploi du mécanisme est en mesure de fournir une clé de répartition de ces deux modalités de réparation. / For several years, loss of chance has interested administrative judges and legal writing in public law. The former, who have widely developed its area in law of administrative liability, have changed the method of compensation of this instrument, by using the example of private law. The second has tried to identify the justifications of the use of loss of chance by using the uncertainty of prejudice and the one of causal relationship. But the analysis of jurisprudence shows that, despite the diversity of risks justifying the use of loss of chance, this is in keeping with a unique scope which is characterized by causal uncertainty. The variety is to be found elsewhere, at the stage of compensation. According to the selected method – the all or nothing approach or proportional compensation – the face of the loss of chance changes. It sometimes forms a presumption of causation, sometimes a prejudice, and so overcomes the causal uncertainty in two different ways. The current hesitations of administrative judges prove that it is difficult to choose between one or the other of two methods of compensation, and therefore, between the two instruments which are linked to them. However, the type of risks which underlies the use of mechanism can give a key to repartition of these two methods of compensation.

Le développement massif des énergies renouvelables intermittentes dans les systèmes de puissance affecte le fonctionnement des systèmes électriques. En raison des techniques limitées et des investissements nécessaires pour maintenir le niveau de sécurité électrique actuel, les questions liées à l'envoi, à la stabilité statique et dynamique pourraient arrêter le développement de ces sources. Le sujet de la thèse est de développer un outil pour mesurer l'incertitude sur la disponibilité de la puissance produite par les générateurs photovoltaïques dans un réseau urbain. Premièrement, l'incertitude est modélisée par l'étude de la nature incertaine de la PV énergie production et de la charge. Avec les méthodes stochastiques, on calcule la réserve de puissance (OR) un jour d'avance en tenant compte d'un indice de risque de fiabilité associé. Ensuite, l'OR est distribué en différents générateurs (générateurs photovoltaïques actifs et micro-turbines à gaz). Afin de minimiser le coût opérationnel total et/ou les émissions équivalentes de CO2, une planification optimale et une répartition quotidienne de l'OR dans différents générateurs d'énergie sont mises en œuvre. Enfin, un logiciel libre «Un système de gestion de l'énergie convivial et un superviseur de la planification opérationnelle» est développé à partir de l'interface utilisateur graphique de Matlab pour conceptualiser le fonctionnement global du système. / The massive development of intermittent renewable energy technologies in power systems affects the operation of electrical systems. Due to technical limitations and investments needed to maintain the current electrical security level, issues related to dispatching, static and dynamic stability could stop the development of these distributed renewable energy sources (RES). The subject of the PhD is to develop a tool to study the uncertainties of PV power and load forecasting in an urban network. Firstly, the uncertainties are modeled by studying the uncertainty nature of PV power and load. With stochastic methods, the day-ahead operating reserve (OR) is quantified by taking into account an associated reliability risk index. Then the OR is dispatched into different power generators (active PV generators and micro gas turbines). To minimize the microgrid total operational cost and/or equivalent CO2 emissions, day-ahead optimal operational planning and dispatching of the OR into different power generators is implemented. Finally, a freeware “A User-friendly Energy Management System and Operational Planning Supervisor” is developed based on the Matlab GUI to conceptualize the overall system operation

Les maladies rares sont d’identification récente. Elles posent de nombreuses difficultés diagnostiques parce qu'encore mal connues par le corps médical. Elles se présentent parfois par des symptômes que nous avons nommés comme disqualifiants parce que principalement subjectifs et sans manifestation objectivable ou visible par la biologie ou l’imagerie. Notre travail est au carrefour de la philosophie et de la psychologie sociale. Nous avons travaillé à partir du vécu de 16 malades qui ont participé à notre recherche par un entretien semi-dirigé. Les grandes thématiques de leur vécu ont ainsi pu être identifiées : l'expérience pathique de l’éprouvé, les modèles de représentation, les métaphores utilisées pour dire la génétique et la rareté, le lien avec le corps médical et l'expérience sociale des maladies. Pour les personnes atteintes, ces maladie rares ne sont ni des maladies ni des handicaps, mais un entre-deux.Compte tenu que 80 % des maladies rares sont d'origine génétique, nous avons exploré comment cette dimension intervient dans le vécu de la maladie rare. L'imaginaire de la génétique est encore très prégnant, évoquant l'origine causale linéaire de la maladie et tous les espoirs de guérison. Il est souvent associé à une représentation de l'erreur, de la faute ou de la malformation qui est survenue lors de la fécondation. C'est avec toutes ces représentations que les malades vont devoir reconstruire leur vie bouleversée par l'existence de la maladie pour laquelle malheureusement encore le plus souvent il n'existe pas de thérapeutique. Ce parcours nous a conduit à envisager une médecine qui intégrerait une médecine de l'incertitude et reconnaîtrait les limites de la connaissance médicale. À terme, cette médecine devrait pouvoir devenir celle de l’adaptabilité soutenant le travail d'adaptation du malade qui doit trouver le chemin pour continuer d’être un vivant malgré les limites imposées par la maladie. Sur ce chemin parfois très long, la narration, l’échange des savoirs et une importante solidarité entre malades au sein des associations de patients soutiennent les capacités du malade à se reconstruire comme sujet, lui ouvrant la possibilité de vivre son destin comme une destinée. / Rare diseases have only recently been identified. They set up quite a lot of diagnostic difficulties because not well-known yet by the medical profession .They sometimes occure by (ou bien with? With symptoms we named as being disqualifying because mainly subjective and without any outbreak possibly objective or evident by biology or medical imaging.Our work is at the crossroad of philosophy and social psychology. Week-end worked on the base of actual experience of 16 sick patients cases who took part in our research through semi-managed talks. So,main themes of their actual current experience could be identified : the pathological of the suffering person, the models of representation,the images used to express the genetics and the rare case, the link with the medical profession and the social experience of the diseases. For the patients concerned,these rare diseases are neither diseases nor handicaps but in-between cases.Taking into account that 80% of rare diseases have a genetique genetic origine origin ,we explored how this theory involves in the way it is lived. The imaginary of genetics still is still very pregnant,calling forth the causal linear origin of the disease and all hopes for recovery .It is often connected to a representation of the error,the fault or the malformation that happened at the time of fecondation. It is with all these representations that patients will have to rebuild their life,upset by the disease against which unfortunately more often most of the time ,no therapy exists yet. This research lead us to view a therapy that would combine a therapy of uncertainty and admit the limits of medical knowledge. In the end, this therapy should be able to become the therapy of an adaptation supporting the adaptability work of the patient who has to find his way to keep being a human person. in spite of the limits compelled by the disease. All along this sometimes very long way, the exchange of knowledge and an amazing solidarity among the patients within the associations back up the patient's capacities to rebuild himself as a subject, giving him the possibility of living his fate as a destiny.

The pressure-time method is one of two methods of measuring the flow rate on large hydraulic structures applicable to IEC 60041, which is based on the temporal integration of the measured pressure difference and the formation of a water hammer in a closed pipe. The aim of this master thesis is to perform a literature review of this method and to evaluate the flow rate of the measured data. Furthermore, the thesis deals with determination of the sensitivity of the evaluated flow rate to the weights of individual pressure sensors and to numerical modifying of the measured pressures. The first part is made using MS Excel. The flow rate is always evaluates with only one pressure sensor and it is compared with the original flow rate. There is research, how absence of the sensor has an impact on the evaluated flow rate. In the second part of the determination of the sensitivity of the evaluated flow rate, various encroachment (signal smoothing, noise, time delay, frequency band removal) are performed of measured pressure signal in Matlab. Various surrounding influences or sensors failures are simulated.