The Egyptian religion viewed the whole world as divine and inhabited by both gods and men. Concepts such as death was therefore explained through myths. The ancient society feared death but desired an eternal life. The Egyptians saw death as a physical dismemberment of the body as had happened in the myth of Osiris when death was first introduced to the world. Osiris functioned as a prototype for all men as he had overcome death by finding a new existence in the netherworld. He was not viewed as a resurrected deity but as a god who had found a way to live forever after death. Funerary texts were developed to help the Egyptians navigate the netherworld, overcome trials and dangers, and to become Osiris. These were an extensive corpus of texts which was placed in the grave with the deceased. By analyzing the New Kingdom’s Book of the Dead the Egyptians’ fear of death can be clearly interpreted in the spells which the book contains. In the Book of the Dead there are 189 spells which functions to secure an eternal life after death by protecting the dead from a number of horrible fates. The book depicts a number of dangerous animals and beings in the netherworld which the spells would offer protection from. There are also incantations for things taken for granted on earth such as breathing, walking upright, not eating faeces or drinking urine. The need to formulate these spells shows an underlying fear of death, and deliverance came by using the Book of the Dead. To preserve the body of the deceased in the grave was of the outermost importance since eternal life could only be achieved if the remains worked as a link between the living world and the land of the dead. That is why the Egyptians developed such a complex funerary ritual and mummified the remains, preserving it forever. Fear of death is derived from the descriptions of it as an isolation, total destruction, dismemberment, and decomposition. The purpose of the ancient Egyptian Book of the Dead was to counteract this fate as it assured the deceased of an eternal life.

The middle atmosphere is a very important part of the Earth system. Until recently, we did not realize the importance of the structure of this vaporous shell and of the fundamental role it plays in both creating and sustaining life on the planet. Thanks to the development and improvement of new sounding methods and techniques, our knowledge of the composition of the atmosphere has become more detailed than ever before. We have also learned how to reveal complex interactions between different species and how they react to the incoming solar radiation. The middle part of the Earth’s atmosphere serves as a host for the Polar Mesospheric Clouds. These clouds consist of a thin layer of water-ice particles, only exsisting during the summer months and only close to the poles. There are indications that the occurrence of Polar Mesospheric Clouds may be linked to climate change. It has been pointed out that the first sightings coincide with the industrial revolution. Satellite observations have shown that Polar Mesospheric Clouds have become brighter and possibly more widely distributed during the 20th century. The clouds might therefore be suited as indicators of the variability of the climate - a good reason for studying this night-shimmering phenomena. The clouds can also be used as a proxy for middle atmospheric dynamics. In order to fully utilize Polar Mesospheric Clouds as tracers for atmospheric variability and dynamics, we need to better understand their local properties. The Optical Spectrograph and Infra-Red Imager System (OSIRIS) is one of two instruments installed on the Odin satellite. The optical spectrograph of this instrument observes sunlight scattered by the atmosphere and thus the Polar Mesospheric Clouds. This thesis deals with a tomographic technique that can reconstruct both horizontal and vertical structures of the clouds by using observations from various angles of the atmospheric region. From this information, microphysical properties such as particle sizes and number densities are obtained. The tomographic technique presented in this thesis also provides a basis for a new satellite concept - MATS. The idea behind the MATS satellite mission is to analyze wave activity in the atmosphere over a wide range of spatial and temporal scales, based on the scientific heritage from Odin/OSIRIS and the tomographic algorithms presented in this thesis. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper3: Submitted. Paper 4: Manuscript.</p>

Universiẗat, Diss., 2001--Osnabrück.

Orientador: Ivan Esperança Rocha / Banca: Andrea Lucia Dorini de Oliveira Carvalho Rossi / Banca: Antonio Brancaglion Júnior / Resumo: Osíris foi um dos deuses mais importantes dentro do panteão da civilização egípcia. Encontramos alusões ao seu mito desde o começo da era dinástica até o período greco-romano, onde temos a síntese realizada por Plutarco (45-120 d.C.) no seu tratado sobre Ísis e Osíris. Através da análise desse mito, tal como narrado por Plutarco, pode-se perceber que sua influência foi muito profunda e marcante na história do Egito abrangendo questões referentes aos aspectos principais dessa sociedade. Seu mito respondia questões e anseios pertinentes a todos os egípcios sendo dessa forma adorado em todo o país. Possuía características e funções como deus relacionado aos ciclos da natureza, como a Lua, o Nilo e o grão, como mantenedor da ordem e da sucessão real e fundamentalmente como aquele que transcendeu a morte e foi reinar no Ultra-Tumba, tornando-se rei e juiz desse mundo. Portanto, nosso objetivo será mostrar que o mito de Osíris estava relacionado com todos os aspectos da vida egípcia, da paz à guerra, da seca à enchente, da peste à abundância, da posição divina do faraó à dureza da servidão e fundamentalmente, da vida à morte. Conseguindo, assim, abarcar em sua personalidade divina todos os atributos necessários para solucionar e satisfazer as necessidades de todos os estratos sociais, do rei ao servo. / Abstract: Osiris was one of the most important divinities inside the panteon of Egyptian civilization. We find hints of this myth since the beginning of the Dynastyc era until the Greco-Roman period, in which we have the syntesis made by Plutarch (45-120 A.D.) in his work about Isis and Osiris. Analyzing the myth of Osiris, as it is narrated by Plutarch, we can realize that its influence was very deep and very important in the history of Egypt, reaching questions concerning the main features of this society. The myth of Osiris answered questions and wishes which were pertinent to all egyptians, so that it was adored in entire country. It possessed characteristics and functions as god related to the cycles of nature, like the Moon, the Nile River and the seed; as keeper of order and of regal succession and, fundamentally, as the one which transcended the death and went to reign in Over-Grave, becoming king and judge of that world. Thus, our purpose will be to show that the myth of Osiris was related to all features of Egyptian life, from peace to war, from dryness to inundation, from plague to plenty, from the divine position of the king to the hardness of servitude, and fundamentally, from life to death. So, the myth of Osiris got to embrace, in its divine personality, all the necessary attributes to resolve and to satisfy the needs of all social classes, from the king to the serf. / Mestre

NASA’s Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Ex- plorer (OSIRIS-REx) spacecraft arrived at the near-Earth rubble pile asteroid (101955) Bennu in December 2018, where it took high resolution images of the surface. The im- ages revealed that the surface is covered with boulders of various sizes. The morphology of these boulders can provide valuable information about the body’s history and the mechanical properties of the regolith. In this work, I use OSIRIS-REx images to map the outline of boul- ders on Bennu in two different geologic units: a Rugged Unit and a Smooth Unit. The two units are differentiated by surface texture, shape features and geologic features. This work was implemented using the open-source software QGIS. I compare the two units’ boulder morphology firstly in terms of boulder roughness by looking at the shape factors solidity (to what extent a boulder’s area equals that of its convex hull area) and circularity (to what extent a boulder’s perimeter is similar to the circumference of a circle with the same area). Then I study boulder compactness, by looking at the shape factors elongation (the ratio between its minor and major axis) and roundness (to what extent a boulder’s area resembles that of a circle enclosing the boulder). Despite the geologic differences, I find that there is no significant difference in the boulder roughness and compactness between the two units. Both regions’ boulders possess a large variation of values that overlap significantly. My results match well with laboratory impact experiments, implying that the regolith was created by a catastrophic impact, which is in agreement with Bennu’s status as a rubble-pile asteroid. I also find that the Smooth Unit tends to have smaller boulders (0.579 ± 0.35 m) with more boulders mapped (total 2426) than the Rugged Unit (0.711 ± 0.48 m, total 1774 boulders mapped). Finally, I show that smaller boulders tend to be rounder and less rough than larger boulders in both units. My results imply that boulder morphology is relatively uniform over the surface of Bennu, also indicating that the mechanical material properties associated with the boulder shape (such as for example tensile strength of the assembly, bulk porosity and formation history) are similar in the two units. Although the units are geologically distinct, the boulder morphology is homogeneous.

Ce travail de recherche constitue une étude globale du portique occidental de Philae, prenant en compte l’ensemble architectural, théologique et cultuel qu’il forme. Une première partie pose le cadre dans lequel se situe le portique, en le replaçant dans son contexte topographique, architectural et historique, et présente les fonctions du monument. La deuxième partie aborde plus en détail le monument en présentant ses particularités architecturales, les malfaçons de sa conception, la singularité de ses fenêtres et la diversité de ses chapiteaux. Ensuite, la chronologie de la décoration est établie, depuis le règne d’Auguste jusqu’à celui de Néron et peut-être au-delà. La troisième partie est consacrée à la translittération, la traduction et le commentaire des textes. Les erreurs de signes et les incompréhensions diverses sont exposées. Puis, vient la synthèse, formée par l’étude de la « grammaire » du temple et le commentaire théologique des textes. Enfin une dernière partie présente les différents témoignages de l’homme sous le portique: inscriptions démotiques, grecques, graffites figuratifs et cupules. Cette documentation apporte des informations sur les travaux du portique, le culte officiel et les pratiques en marge du culte officiel qui se déroulaient dans l’espace du parvis du temple d’Isis. Un volume de 158 planches accompagne le volume de texte. Il comprend la copie de tous les textes du portique, pour la plupart inédits. / This work is a comprehensive study of the western portico of Philae temple, taking into account its architectural features, its theology and its function as a place of worship. The first part gives an overview of the topographical, architectural and historical contexts and presents the function of the monument. The second part details its architectural peculiarities, the misconceptions, the singularity of its windows and the diversity of its capitals. Chronology of the decoration is then established, extending from the reign of Augustus till the reign of Nero or maybe after. The third part is devoted to the transliteration, translation and commentary of the texts. Various miswritings and uncomprehensions of the texts are exposed. The synthesis takes into account the « grammaire du temple » and theological commentary of the texts. The last part is devoted to the portico considered as a place of worship and the marks left by the men who worked and passed by there : demotic and greek inscriptions, carved images, gold covering and small cavities. This documentation gives informative insights on the works of the portico, the official cult and the more « popular » practices which occured in the forecourt of the temple of Isis. A volume of 158 plates is added, containing the copy of all the texts of the portico, which are mainly unpublished.

Les programmes d’irradiations technologiques menés dans les réacteurs expérimentaux sont d’une importance cruciale pour le soutien du parc électronucléaire actuel en termes d’étude et d’anticipation du comportement sous irradiation des combustibles et des matériaux de structures. Ces programmes permettent d’améliorer la sûreté des réacteurs actuels et également d’étudier les matériaux pour les nouveaux concepts de réacteurs.Les conditions d’irradiations des matériaux dans les réacteurs expérimentaux doivent être représentatives de celles des réacteurs de puissance. Un des principaux intérêts des réacteurs d'irradiations technologiques (Material Testing Reactors, MTRs) est de pouvoir y mener des irradiations instrumentées en ajustant les paramètres expérimentaux, en particulier le flux neutronique et la température. La maîtrise du paramètre température d’un dispositif irradié dans un réacteur expérimental nécessite la connaissance de l'échauffement nucléaire (terme source) dû au dépôt d'énergie des photons et des neutrons interagissant dans le dispositif. La bonne évaluation de cet échauffement est une donnée clé pour les études thermiques de dimensionnement et de sûreté du dispositif.L'objectif de cette thèse est d'améliorer les méthodes d’évaluation de l'échauffement nucléaire en réacteur. Ce travail consiste en l’élaboration d'un schéma de calcul complet innovant, couplé neutron-photon (permettant d’obtenir la contribution des neutrons, des gamma prompts et des gamma de décroissance), fondé principalement sur le code de transport Monte-Carlo TRIPOLI-4 (à 3-dimensions et à énergie continue). Une validation expérimentale du schéma a été effectuée en s’appuyant sur les mesures de calorimétrie réalisées dans le réacteur OSIRIS (CEA Saclay). Des études de sensibilité ont également été menées pour établir l’impact de différents paramètres sur les calculs d’échauffement nucléaire, dont les données nucléaires. Cela a permis de définir le schéma de calcul définitif pour reproduire au plus près la réalité des irradiations technologiques. Le travail de thèse débouche sur un outil opérationnel et prédictif pour l'estimation de l'échauffement nucléaire répondant aux besoins de l’expérimentation en réacteur de recherche et qui peut être étendu plus largement dans des réacteurs de puissance. / Technological irradiation programs carried out in experimental reactors are crucial for the support of the current nuclear fleet in terms of study and anticipation of the behavior under irradiation of fuels and structural materials. These programs make it possible to improve the safety of the current reactors and also to study materials for the new concepts of reactors.Irradiation conditions of materials in experimental reactors must be representative of those of nuclear power plants (NPPs). One of the main advantages of material testing reactors (MTRs) is to be able to carry out instrumented irradiations by adjusting experimental parameters, in particular the neutron flux and the temperature. The control of the parameter temperature of a device irradiated in an experimental reactor requires the knowledge of the nuclear heating (source term) due to the deposition of energy of the photons and the neutrons interacting in the device. A relevant evaluation of this heating is a key data for the thermal studies of design and safety of devices. The objective of this thesis is to improve the methods of the evaluation of nuclear heating in reactors. This work consists of the development of an innovating and complete coupled neutron-photon calculation scheme (allowing to obtain the contribution of neutrons, prompt gamma and decay gamma), mainly based on the TRIPOLI-4 Monte Carlo transport code (with 3-dimensions and continuous energy). An experimental validation of the calculation scheme has been performed, based on calorimetry measurements carried out in the OSIRIS reactor (CEA Saclay). Sensitivity studies have been undertaken to establish the impact of various parameters on nuclear heating calculations (in particular nuclear data) and to fix the final calculation scheme to be closer to the technological irradiation aspects. The thesis work leads to an operational and predictive tool for the nuclear heating estimation, meeting the experimentation needs of research reactors and can be extended more generally to NPPs.

Cette thèse s'inscrit dans le cadre de la mission spatiale Rosetta et porte sur les propriétés spectrophotométriques de la comète 67P/Churyumov-Gerasimenko à l’aide de l’instrument OSIRIS. Cet instrument est composé de deux caméras pour les observations du noyau et de la coma de la comète. Elles permettent d’acquérir des images avec des filtres qui opèrent dans la gamme du proche UV au proche IR. Dans un premier temps, j'ai analysé les courbes spectrophotométriques des taches claires qui sont apparues sur le noyau de la comète. Une étude comparative de celles-ci grâce aux données du spectro-imageur VIRTIS a ainsi permis de constater que les taches claires sont liées à la glace de H2O. Dans un second temps, j’ai entrepris une étude spectrophotométrique de la région Khonsu, qui a mis en évidence les variations saisonnières de la pente spectrale de différents terrains. Par la suite, j’ai élargi mon analyse des taches à tout le noyau de la comète. J’ai détecté plus de 50 taches claires dues à la présence de glace de H2O et j’ai produit une carte pour repérer leurs emplacements sur le noyau, afin d’étudier plus en détail leur répartition et leur évolution au cours de temps. Ceci m’a permis d’identifier quatre types de taches regroupés en fonction de leur morphologie et de constater qu'elles sont dues à différentes sources d'activité cométaire. / This thesis is based on the spectrophotometric properties of the comet 67P/Churyumov-Gerasimenko, using the OSIRIS instrument of Rosetta space mission. Composed of two scientific cameras to observe the nucleus and the coma of the comet, OSIRIS images are acquired with multiple filters, that span the near-UV to near-IR wavelength range. They were used to study the spectrophotometric curves of the exposed bright features that appeared on the surface of the cometary nucleus, leading to a comparative study, that was carried out in collaboration with the VIRTIS spectro-imager aboard Rosetta, that demonstrated, that these exposures are related to H2O ice, using its absorption band located at 2 microns. The thesis further details a spectrophotometric study of the Khonsu region in the southern latitudes of the comet, where the seasonal variation of the spectral slope of different types of terrains is explored. Finally, the results of an extended survey of exposed bright features are presented. More than 50 individual features are presented under four morphologies along with an albedo calculation, suggesting that different activity sources are responsible for their appearance on the nucleus.

This dissertation will critically analyse a gilded bronze Osiris statuette from the Middle Kingdom Period. An attempt is made to verify its authenticity, provenance and probable date of origin, while also gathering information which will help in placing the artefact and others like it in their proper cultural context. Furthermore the value of several investigative techniques employed during the course of this research is also explored. / Old Testament and Ancient Near Eastern Studies / M.A. (Ancient Near Eastern Studies)

Aujourd'hui, l'énergie nucléaire représente une partie non-négligeable du marché énergétique mondial, très probablement vouée à croître dans les prochaines décennies. Les réacteurs du futur devront notamment répondre à des critères supplémentaires économiques mais surtout de sûreté, de non-prolifération, de gestion optimisée du combustible et d'une gestion responsable des déchets nucléaires. Dans le cadre de cette thèse, des études concernant la non-prolifération des armes nucléaires sont abordées, dans le cadre de la recherche et développement d'un nouvel outil potentiel de surveillance des réacteurs nucléaires ; la détection des antineutrinos des réacteurs. En effet, les propriétés de ces particules pourraient intéresser l'Agence Internationale de l'Energie Atomique (AIEA) en charge de l'application du Traité de non-prolifération des armes nucléaires. L'AIEA encourage ainsi ses états membres à mener une étude de faisabilité. Une première étude de non-prolifération est réalisée avec la simulation d'un scénario proliférant utilisant un réacteur de type CANDU et de l'émission en antineutrinos associée. Nous en déduisons une prédiction de la sensibilité d'un détecteur d'antineutrinos de taille modeste à la diversion d'une quantité significative de plutonium. Une seconde étude est réalisée dans le cadre du projet Nucifer, détecteur d'antineutrinos placé auprès du réacteur de recherche OSIRIS. Nucifer est un détecteur d'antineutrinos dédié à la non-prolifération à l'efficacité optimisée conçu pour être un démonstrateur pour l'AIEA. La simulation du réacteur OSIRIS est développée ici pour le calcul de l'émission d'antineutrinos qui sera comparée aux données mesurées par le détecteur ainsi que pour caractériser le bruit de fond important émis par le réacteur détecté dans Nucifer. De façon générale, les antineutrinos des réacteurs sont émis lors des décroissances radioactives des produits de fission. Ces décroissances radioactives sont également à l'origine de la puissance résiduelle émise après l'arrêt d'un réacteur nucléaire, dont l'estimation est un enjeu de sûreté. Nous présenterons dans cette thèse un travail expérimental dont le but est de mesurer les propriétés de décroissance bêta de produits de fission importants pour la non-prolifération et la puissance résiduelle des réacteurs. Des premières mesures utilisant la technique de Spectroscopie par Absorption Totale (TAGS) ont été réalisées auprès du dispositif de l'Université de Jyväskylä. Nous présenterons la technique employée, le dispositif expérimental ainsi qu'une partie de l'analyse de cette expérience.