[pt] No projeto de uma usina nuclear do tipo PWR, é necessário a verificação de que, nas diversas condições de operação, em regime permanente ou transitório, os limites de projeto de seus componentes não sejam atingidos. No presente trabalho, é desenvolvido um programa em linguagem FORTRAN-IV que simula o comportamento do circuito primário de uma usina PWR típica em transitórios de condição II, em particular os acidentes de retirada descontrolada de um conjunto de barras de controle, queda de um conjunto de barras de controle e diluição descontrolada de boro. No modelo matemático adotado, são tratados o núcleo do reator, a tubulação quente, com pressurizador acoplado, o gerador de vapor, e a tubulação fria. Os resultados obtidos na análise dos citados acidentes são comparados com os constantes no relatório final de análise de segurança da usina Almirante Álvaro Alberto, unidade Angra-I (FSAR), e considerados satisfatórios. / [en] In a PWR nuclear power plant design it`s necessary to verify that, in many operation conditions, at steady state or transients, its components conditions are always below design limits. In this work, is developed a code in FORTRAN-IV language that simulates primary loop behavior of a typical PWR power plant in condition II transients, in particular the accidents of uncontrolled rod cluster control assembly bank withdrawal, rod cluster control assempbly drop and uncontrolled boron dilution. In this model are treated the reactor core, the hot-leg with a pressurizer coupled, the steam generator and the cold-leg. The results obtained are plotted against that of the final safety and analysis report of the Almirant Álvaro Alberto plant, unity Angra-I (FSAR), and considered satisfactory.

Pour des missions spatiales de longue durée, les plantes supérieures doivent faire partie des systèmes de support-vie. Le projet Micro-Ecological Life Support System Alternative (MELiSSA, alternative de système de support-vie micro-écologique) de l’Agence Spatiale Européenne est basé sur un système clos de support vie qui inclut, autour d’un compartiment consommateur, des compartiments microbiens et des plantes supérieures. Les plantes consomment les déchets pouvant être recyclés (les eaux usées et du CO2) et produisent de la nourriture fraîche, de l’eau potable et de l’oxygène pour l’équipage. Un des points clé pour ce type d’étude est le maintien d’un système qui assure le recyclage de tous les éléments C, H, O, N, S, P, … C’est pourquoi la base de l’étude repose sur une modélisation des stœchiométries de conversion qui doit traduire les échanges de matière et d’énergie en fonction des limitations physiques qui sont les paramètres de contrôle du système. L’étape préliminaire a été d’établir un modèle métabolique de feuille (un sous-modèle du modèle biochimique), comprenant le métabolisme central et utilisant les techniques métaboliques d’analyse des modes élémentaires (EFMA) et d’analyse des flux métaboliques (MFA) associé à une vision intégrée de l’énergétique du métabolisme central. En l’absence de données expérimentales suffisantes, le modèle métabolique de feuille a été construit à partir de la composition de la biomasse référencée par le Département Américain de l'Agriculture (USDA) et validé avec les données expérimentales de laitues (Lactuca sativa) cultivées dans l’installation de recherche des systèmes à environnement contrôlé (CESRF) de l’Université de Guelph (Canada). Pour la première approche, le modèle est satisfaisant et prometteur ; il peut prédire la production de biomasse une fois connecté aux facteurs physiques de la croissance de plante (lumière, disponibilité en CO2 et en eau, …) au cours du temps et à la composition de la biomasse. Cependant, nos résultats souffrent d’un manque de données pour vérifier les modèles métaboliques ; ainsi, différents types de mesures pour des prédictions plus précises sont proposés. Le futur modèle doit être en mesure de contrôler la croissance de la plante pour la survie des humains, connaissant les flux provenant des autres compartiments de la boucle MELiSSA. Par ailleurs, l’approche décrite ici peut être utilisée de manière plus générale pour tous types d’études et modélisations du métabolisme, en particulier pour étudier le fonctionnement simultané et/ou consécutif des métabolismes photosynthétique et respiratoire. / For long term space missions, higher plants are necessary to be included in life support systems. The Micro Ecological Life Support System Alternative (MELiSSA) project of European Space Agency (ESA) is based on a closed life support system where microbial and higher plant compartments support the consumer’s compartment. Plants consume the possible recycling wastes (waste water and CO2) and provide fresh food, potable water and oxygen to the crew. One of the key points for this kind of study is to maintain a system which recycles all the elements C, H, O, N, S, P, etc. That is why, the study is based on the modelling of conversion stoichiometries ; they are the results of the control parameters of the system (physical limitations of mass and energy exchanges). As a preliminary step, we have established leaf metabolic model (a sub model of the plant biochemical model) involving central carbon metabolism using metabolic techniques, elementary flux mode analysis (EFMA) and metabolic flux analysis (MFA). It is associated to an integrated approach of energetics and central metabolism. Due to data limitations, the leaf metabolic model was constructed taking the biomass composition of lettuce (Lactuca sativa) from United States Department of Agriculture (USDA) and validated with the experimental data where lettuce grown in controlled Environment Systems Research Facility (CESRF) of University of Guelph (Canada). For the first approach, the model is satisfying and promising ; it can predict the biomass production connecting the physical plant growth factors (light, CO2 and water availability, etc.) along with time course growth and biomass composition. However, our results show the lack of sufficient data ; hence, various kinds of measurements required for more accurate model predictions are proposed. The future model must be able to control and manage the plant growth for human survival knowing the fluxes from other compartments of MELiSSA loop. Further, the approach described here can be used more generically in all kinds of metabolic studies and modeling, especially for studying simultaneous and/or consecutive photosynthetic and respiratory metabolisms.

The performance of a submerged membrane bioreactor for the duty of gas field produced water treatment was appraised. The system was operated under steady state conditions at a range of mixed liquor suspended solids (MLSS) concentrations and treatment and membrane performance examined. Organics removal (COD and TOC) display removal rates between 90 and 97%. Removal of specific target compounds Benzene, Toulene, Ethylbenzene and Xylene were removed to above 99% in liquid phase with loss to atmosphere between 0.3 and 1%. Comparison of fouling rates at a number of imposed fluxes has been made between long term filtration trials and short term tests using the flux step method. Produced water fed biomass displays a greater fouling propensity than municipal wastewater fed biomass from previous studies. Results indicate an exponential relationship between fouling rate and flux for both long and short term trials, although the value was an order of magnitude lower during long term tests. Moreover, operation during long term trials is characterised by a period of pseudo stable operation followed by a catastrophic rise in TMP at a given critical filtration time (tfi, ) during trials at 6 g. L"1. This time of stable operation, tfit, is characterised by a linear relationship between fouling rate and flux. Results have been compared with the literature. Data for membrane fouling prior to the end of t fit yielded a poor fit with a recently proposed model. Trends recorded at t> trlt revealed the fouling rate to follow no definable trend with flux. The system showed resilience to free oil shocking up to an oil concentration of 200ppmv. Following an increase in oil concentration to 500 ppmv, rapid and exponential fouling ensued.

Comment appréhender le sens socio-politique de l'officialisation de la catégorie d'inspiration démographique « immigré » dans le cadre du lancement de la politique d'intégration au début des années 1990 ? Telle est question à laquelle cette thèse s'efforce de répondre au travers d'une sociologie foucaldienne de la quantification de l'immigration en tant que population. Ce travail en vient ainsi notamment à formuler l'hypothèse selon laquelle l'enrôlement du savoir démographique participe, dans le cadre du travail de réorganisation de la production des statistiques publiques en matière d'immigration entrepris entre 1990 et 1997 au sein du groupe « Statistiques » attaché au HCI (Haut Conseil à l'intégration), à la formalisation statistique d'une représentation cognitive de l'immigration en tant que séries d'agrégats totalisés et temporalisés d'individus par et dans leur mobilité juridico-légale. Replaçant notamment le processus de mise en catégorie de l'« immigré » en vis-à-vis de l'élaboration d'une méthode comptable de mesure des flux annuels d'immigrations et des tentatives de pré-formater l'exploitation d'AGDREF (Application nationale pour la gestion des dossiers des ressortissants étrangers en France du ministère de l'Intérieur), cette recherche suppose et propose de substituer à l'analyse du processus socio-historique d'objectivation du critère de l'« origine », celle des logiques dispositives de sécurisation (statistique) des flux. / What is the socio-political meaning of the category of “immigrant” that the French integration policy officialised in 1990? The thesis uses a foucaldian sociology of quantification of immigration as a population to answer this question. The mobilization of a demographic knowledge, in the context of the reform of immigration statistics by the “Statistic” Group of the HIC between 1990 and 1997, leads to the formalization of a cognitive representation of immigration, as series of totalized and temporalized aggregates of individuals, from and in their juridical and legal mobility. In particular, we compare the process of categorization of the “immigrant” to a calculative method measurement of annuals flows of immigrations, as well as to the attempts to format the processing of AGDREF. This allows to switch from the analysis of socio-historical processes that objectivates the “origin” criteria, to an analysis in terms of (statistical) securitization of flows.

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