Here I study the “plasma interactions with icy bodies in the solar system”, that is, my quest to understand the fundamental processes that govern such interactions. By using numerical modelling combined with in situ observations, one can infer the internal structure of icy bodies and their plasma environments. After a broad overview of the laws governing space plasmas a more detailed part follows. This contains the method on how to model the interaction between space plasmas and icy bodies. Numerical modelling of space plasmas is applied to the icy bodies Callisto (a satellite of Jupiter), the dwarf planet Ceres (located in the asteroid main belt) and the comet 67P/Churyumov-Gerasimenko. The time-varying magnetic field of Jupiter induces currents inside the electrically conducting moon Callisto. These create magnetic field perturbations thought to be related to conducting subsurface oceans. The flow of plasma in the vicinity of Callisto is greatly affected by these magnetic field perturbations. By using a hybrid plasma solver, the interaction has been modelled when including magnetic induction and agrees well with magnetometer data from flybys (C3 and C9) made by the Galileo spacecraft. The magnetic field configuration allows an inflow of ions onto Callisto’s surface in the central wake. Plasma that hits the surface knocks away matter (sputtering) and creates Callisto’s tenuous atmosphere. A long term study of solar wind protons as seen by the Rosetta spacecraft was conducted as the comet 67P/Churyumov-Gerasimenko approached the Sun. Here, extreme ultraviolet radiation from the Sun ionizes the neutral water of the comet’s coma. Newly produced water ions get picked up by the solar wind flow, and forces the solar wind protons to deflect due to conservation of momentum. This effect of mass-loading increases steadily as the comet draws closer to the Sun. The solar wind is deflected, but does not lose much energy. Hybrid modelling of the solar wind interaction with the coma agrees with the observations; the force acting to deflect the bulk of the solar wind plasma is greater than the force acting to slow it down. Ceres can have high outgassing of water vapour, according to observations by the Herschel Space Observatory in 2012 and 2013. There, two regions were identified as sources of water vapour. As Ceres rotates, so will the source regions. The plasma interaction close to Ceres depends greatly on the source location of water vapour, whereas far from Ceres it does not. On a global scale, Ceres has a comet-like interaction with the solar wind, where the solar wind is perturbed far downstream of Ceres. / Här studerar jag “plasmaväxelverkan med isiga kroppar i solsystemet”, det vill säga, min strävan är att förstå de grundläggande processerna som styr sådana interaktioner. Genom att använda numerisk modellering i kombination med observationer på plats vid himlakropparna kan man förstå sig på deras interna strukturer och rymdmiljöer. Efter en bred översikt över de fysiska lagar som styr ett rymdplasma följer en mer detaljerad del. Denna innehåller metoder för hur man kan modellera växelverkan mellan rymdplasma och isiga kroppar. Numerisk modellering av rymdplasma appliceras på de isiga himlakropparna Callisto (en måne kring Jupiter), dvärgplaneten Ceres (lokaliserad i asteroidbältet mellan Mars och Jupiter) och kometen 67P/Churyumov-Gerasimenko. Det tidsvarierande magnetiska fältet kring Jupiter inducerar strömmar inuti den elektriskt ledande månen Callisto. Dessa strömmar skapar magnetfältsstörningar som tros vara relaterade till ett elektriskt ledande hav under Callistos yta. Plasmaflödet i närheten av Callisto påverkas i hög grad av dessa magnetfältsstörningar. Genom att använda en hybrid-plasma-lösare har växelverkan modellerats, där effekten av magnetisk induktion har inkluderats. Resultaten stämmer väl överens med magnetfältsdata från förbiflygningarna av Callisto (C3 och C9) som gjordes av den obemannade rymdfarkosten Galileo i dess bana kring Jupiter. Den magnetiska konfigurationen som uppstår möjliggör ett inflöde av laddade joner på Callistos baksida. Plasma som träffar ytan slår bort materia och skapar Callistos tunna atmosfär. En långtidsstudie av solvindsprotoner sett från rymdfarkosten Rosetta utfördes då kometen 67P/Churyumov-Gerasimenko närmade sig solen. Ultraviolett strålning från solen joniserar det neutrala vattnet i kometens koma (kometens atmosfär). Nyligt joniserade vattenmolekyler plockas upp av solvindsflödet och tvingar solvindsprotonernas banor att böjas av, så att rörelsemängden bevaras. Denna effekt ökar stadigt då kometen närmar sig solen. Solvinden böjs av kraftigt, men förlorar inte mycket energi. Hybridmodellering av solvindens växelverkan bekräftar att kraften som verkar på solvinden till störst del får den att böjas av, medan kraften som verkar till att sänka dess fart är mycket lägre. Ceres har enligt observationer av rymdteleskopet Herschel under 2012 och 2013 haft högt utflöde av vattenånga från dess yta. Där har två regioner identifierats som källor för vattenångan. Eftersom Ceres roterar kommer källornas regioner göra det också. Plasmaväxelverkan i närheten av Ceres beror i hög grad på vattenångskällans placeringen, medan det inte gör det långt ifrån Ceres. På global nivå har Ceres en kometliknande växelverkan med solvinden, där störningar i solvinden propagerar långt nedströms från Ceres.

Cette thèse se propose d’étudier la difficulté de l’estimation de la distance dans le cadre de la géométrie de l’espace visuel. En philosophie de la perception, cette thèse est d'abord discutée au plan épistémologique : comment savoir que cette distance n'est pas connue ou connaissable, quoique perçue et discutée. Les travaux de Berkeley nous servent de point de départ et fixent un cadre spéculatif, puisque Berkeley soutient en effet que le jugement porté sur la distance résulte entièrement de l'expérience, quoique cette distance ne puisse être vue phénoménalement. La thèse se propose d'examiner une question essentielle supportée par cette alternative centrale mais au plan ontologique cette fois : comme déterminer de quel type est la distance : est-elle inconsciemment visible ? tangible ? ou visible et tangible à la fois ? Peut-elle être une entité assignable dans un espace hyperbolique, ou sphérique, un espace strictement euclidien, ou hyperbolique et sphérique en même temps qu'euclidien ? Pour appuyer notre propos et notre recherche nous mettrons à l’épreuve différents textes et expériences en passant de Berkeley à I. Rock ou de T. Reid à M. Wagner. Notre but aura été d'explorer les limites argumentatives et de montrer ce qui est impliqué par ces différentes appréciations et assignations de la distance dans tel ou tel espace déterminé. A chaque fois s'affrontent la géométrie de l’espace visuel et l’optique physiologique, mais au sein d'un même débat de fond qui consiste à savoir comment définir philosophiquement l’estimation de la distance ? / This thesis examines the difficulties in estimating the geometrical distance of visual space. Submitted in the field of Philosophy of Perception, this thesis is first discussed from an epistemological standpoint: how does one know that this distance is unknown or unknowable despite being perceived and discussed. The various works of Berkeley serve as a point of depart and establish a speculative framework as Berkeley held that judgment of distance results entirely from experience despite the fact that this distance cannot be seen in a phenomenal way. This thesis examines an essential question supported by this central problem, this time from an ontological position: how is the type of distance to be determined: is it unconsciously visible?tangible? or both visible and tangible at the same time? Can it be categorized in a hyperbolic space, or spherical space, or a strictly Euclidean space, or hyperbolic and spherical at the same time as Euclidean? In support of the thesis and research, various texts and experiences have been examined and contrasted, including those of Berkeley and I. Rock as well as T. Reid and M. Wagner. The goal has been to explore the limits of argumentation and to show what is implicated by these different accounts and assignment of distance in one, versus another, determined space; additionally studying subjects including the experience of the alleys or the so-called the moon illusion, which appeared to be demonstrative examples. In each instance, geometry of visual space and physiological optics confront one another, but at the center of this same fundamental debate is the question of how to define the estimation of distance philosophically?

<p>Este trabalho tem como objetivo analisar como são feitas as idas e voltas aos cotidianos das três donas-de-casa que são as protagonistas dos contos <em>Devaneio e Embriaguez duma rapariga</em>, <em>Amor</em> e <em>A fuga</em>, de Clarice Lispector e, sobretudo analisar o eventual valor simbólico que a presença dos fatores naturais e da lua exercem sobre estes contos.</p><p>Com apoio nos trabalhos de Ana Carolina de Araújo Abiahy (2006a, 2006b, 2008), Berta Waldman (1993) e Yudith Rosenbaum (2002) e dos conceitos-teóricos de gênero apresentados por Chatarina Edfeldt e Anabela Galhardo Couto (2008) em <em>Mulheres que escrevem Mulheres que lêem</em> procuram-se respostas à questões de como, por que e através de que as protagonistas fazem suas escapadas de seus cotidianos e como podem ser extraídos valores simbólicos denunciadores das causas das angústias das personagens.</p><p>Dentre as conclusões estão, que as protagonistas sentem um incômodo em suas vidas e são por isto, chamadas para fazerem suas “idas” pelo que a lua e a natureza simbolizam: um chamado para uma outra vida, livre de suas situações aprisionantes. Conclui-se também que após as suas idas as personagens voltam ao seu cotidiano normal por causa dos valores patriarcais internalizados, dentre os quais estão incluídas a culpa, amor à família e a impossibilidade destas mulheres de cuidarem autonomamente de sí mesmas. No entanto, percebem-se que após os questionamentos feitos em suas idas elas voltam conscientizadas, despertadas para uma nova maneira de olharem para si mesmas, suas situações e o papel de gênero que elas fazem.</p> / <p>This work has the purpose to analyze how the departures and arrivals to the daily life are made by the three housewives who composes the main characters in the short-stories <em>Devaneio e Embriaguez duma rapariga,</em> <em>Amor</em> and <em>A fuga</em>, by Clarice Lispector and, above all analyze the eventual symbolic value that the presence of the natures elements and the moon exerts over these short-stories.</p><p>With the support of Ana Carolina de Araújo Abiahy (2006a, 2006b, 2008), Berta Waldman (1993) and Yudith Rosenbaums (2002) works and of the theoretic concepts of gender presented by Chatarina Edfeldt and Anabela Galhardo Couto (2008) in <em>Mulheres que escrevem Mulheres que lêem</em>, answers are sought to the questions of how, why and through what, the main characters make escapes from their everyday lives and, how it is possible to extract symbolic values that denunciates the causes of the main characters anxieties.</p><p>Within the conclusions are that the main characters feel a discomfort with their lives and are because of that, called to make their “departures” through what the moon and the nature symbolizes: a calling to another life, free from their imprisoning situations. Another conclusion is that they come back because of the internalized patriarchal values, among which are included the guilt, the love to the family and the impossibility of these women to take care of themselves. However, it is noticeable that after the questionings made in their departures and arrivals they return with awareness, awakened to a new way to look at themselves, their situations and the gender roles that they play.</p> / <p>Detta arbete har som syfte att analysera hur turerna och returerna till vardagen görs av de tre hemmafruar som utgör huvudpersonerna i berättelserna <em>Devaneio e Embriaguez duma rapariga</em>, <em>Amor</em> och <em>A fuga</em>, av Clarice Lispector och, framförallt analysera det eventuella symboliska värdet som närvaron av naturens faktorer och månen utövar över dessa berättelser.</p><p>Med stöd av Ana Carolina de Araújo Abiahy (2006a, 2006b, 2008), Berta Waldman (1993) och Yudith Rosenbaums (2002) arbeten samt av genus-teoretiska begrepp som pressenteras av Chatarina Edfeldt och Anabela Galhardo Couto (2008) i <em>Mulheres que escrevem Mulheres que lêem</em>, sökes svar till frågeställningarna hur, varför och genom vad, huvudpersonerna flyr från sina vardagsliv och, hur det är möjligt att utvinna symboliska värden som anger anledningarna till huvudpersonernas ångest.</p><p>Bland slutsatserna finnes att huvudpersonerna känner ett obehag med sina liv och blir därför, kallade till att göra sina ”turer” genom det som månen och naturen symboliserar: en kallelse till ett annat liv, fritt från sina fängslande situationer. Ytterligare en slutsatts är att de färdas tillbaka på grund av de internaliserade patriarkaliska värderingar, som inkluderar skulden, kärleken till familjen samt omöjligheten för dessa kvinnor att klara sig själva. Emellertid, märks det att efter de diskussioner som de gjort i sina turer kommer de tillbaka medvetandegjorda, uppväckta till ett nytt sätt att se på sig själva, sina situationer och de genusroller som de spelar.</p>

Durant le premier millénaire, entre le VIIe/VIe et le IIe siècle avant Jésus-Christ, les Carthaginois ont élevé des stèles votives dans un sanctuaire à ciel ouvert. Dédiées à la dyade Baal Hamon et Tinnit Pane Baal, ces sculptures montrent sur leur surface décorée une iconographie qui se compose, en grande partie, de signes et symboles géométriques: un losange, une image céleste composée d’un disque et d’un croissant, une « idole-bouteille », le signe dit « de Tinnit » et un étendard nommé « caducée » dans la littérature. À ce jour, les informations liées à l’interprétation de ces images sont restées largement disparates et fragmentaires et aucune synthèse approfondie n’a encore été publiée à leur sujet. Afin d’aboutir à des résultats tangibles, il s’avère indispensable de mettre à plat l’ensemble des connaissances acquises sur le sujet. À cette fin, une nouvelle approche méthodologique basée sur une typologie raisonnée, c’est-à-dire diachronique et limitée à la seule métropole carthaginoise, sera mise en place. En outre, cette démarche doit être définie en adéquation avec le contexte régional tyrien, berceau de l’idéologie religieuse carthaginoise. Au-delà du rapport de ces images avec les divinités invoquées, la typologie à promouvoir doit, en même temps, nous permettre de clarifier le contexte chronologique propre à chacun de ces éléments figurés. / During the first millennium, between the VIIth/VIth and IInd century bc, the Carthaginians have erected votive stelae in an open air precinct. Dedicated to the dyad Baal Hamon and Tinnit Pane Baal, those sculptures show on their decorated surface an iconography mostly composed of geometric signs and symbols: a lozenge, a celestial pattern made up of a disk and a crescent, a “bottle idol”, the “Tinnit sign” and a standard named “caduceus” in the literature. To date, the information tied up with the interpretation of those images are largely disparate and fragmentary and no thorough synthesis has been published on their subject. In order to reach tangible results, it is necessary to gather all known data’s on the subject. To that end, a new methodological approach, based on a diachronic typology limited to the sole Carthaginian metropolis, will be put in place. Moreover, this approach must be defined in adequacy with the Tyrian regional context, cradle of the Carthaginian religious ideology. Beyond the links of those images with of the invoked divinities, the typology to promote must allow us, in the same time, to clarify the chronological context peculiar to each of the studied items.

The purpose of this thesis is to bring forward and discuss the American vision for space exploration found at NASA's homepage, how the vision is popularised and why. NASA's homepage is analyzed as popularized science and the theoretical perspective emanates from the field of popular science and especially the work of Johan Kärnfelt. The historical reference is made up by Howard E McCurdy and he's thoughts about space and the American imagination. The analysis is based on a number of documents that popularize the vision for space exploration and is intended for the public. These documents describe the future plan for NASA and US space exploration. / Syftet med denna uppsats är att undersöka hur de amerikanska rymdvisionerna gestaltats på NASA:s hemsida, hur dessa populariseras samt vilka de bakomliggande drivkrafterna kan tänkas vara. NASA:s hemsida kommer att ses som populariserad vetenskap och det teoretiska perspektivet utgår från den populärvetenskapliga genren där en stor del av det teoretiska underlaget utgår från docenten Johan Kärnfelts tankar om populariseringen av vetenskap. Som historisk referens används professor Howard E. McCurdys tankar om den amerikanska rymdvisionen. Materialet som ingår i analysen är hämtat från NASA:s hemsida. Samtliga dokument handlar om den amerikanska visionen om rymden och USA:s fortsatta aktiviteter i rymden.

<p>The purpose of this thesis is to bring forward and discuss the American vision for space exploration found at NASA's homepage, how the vision is popularised and why. NASA's homepage is analyzed as popularized science and the theoretical perspective emanates from the field of popular science and especially the work of Johan Kärnfelt. The historical reference is made up by Howard E McCurdy and he's thoughts about space and the American imagination. The analysis is based on a number of documents that popularize the vision for space exploration and is intended for the public. These documents describe the future plan for NASA and US space exploration.</p> / <p>Syftet med denna uppsats är att undersöka hur de amerikanska rymdvisionerna gestaltats på NASA:s hemsida, hur dessa populariseras samt vilka de bakomliggande drivkrafterna kan tänkas vara. NASA:s hemsida kommer att ses som populariserad vetenskap och det teoretiska perspektivet utgår från den populärvetenskapliga genren där en stor del av det teoretiska underlaget utgår från docenten Johan Kärnfelts tankar om populariseringen av vetenskap. Som historisk referens används professor Howard E. McCurdys tankar om den amerikanska rymdvisionen. Materialet som ingår i analysen är hämtat från NASA:s hemsida. Samtliga dokument handlar om den amerikanska visionen om rymden och USA:s fortsatta aktiviteter i rymden.</p>

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In this dissertation I argue that invisible characters, as they appear in Paul Auster’s novels, serve a very specific function within the interpretative framework of a text and that they should be considered to play a functional role, in order to arrive at a more holistic interpretation of the text and a more accurate analysis of said texts. I argue that Auster knowingly includes these characters in his novels as part of his narrative technique, in order for them to serve specific functions and to contribute to the structure of postmodern fiction. I make use of a contextualized close reading of five of Auster’s novels and attempt a hermeneutic interpretation of these novels to arrive at a hermeneutic circle when combining these novels into an integrated whole, individual, work of fiction. Certain parallels can be drawn between Auster’s various novels and these parallels contribute to the various motifs and themes found throughout his work. The importance of space in Auster’s novels is also highlighted with emphasis on liminality which serves as an instigator for transgression to occur between different fictive worlds. / Thesis (MA (English))--North-West University, Potchefstroom Campus, 2013.

In this dissertation I argue that invisible characters, as they appear in Paul Auster’s novels, serve a very specific function within the interpretative framework of a text and that they should be considered to play a functional role, in order to arrive at a more holistic interpretation of the text and a more accurate analysis of said texts. I argue that Auster knowingly includes these characters in his novels as part of his narrative technique, in order for them to serve specific functions and to contribute to the structure of postmodern fiction. I make use of a contextualized close reading of five of Auster’s novels and attempt a hermeneutic interpretation of these novels to arrive at a hermeneutic circle when combining these novels into an integrated whole, individual, work of fiction. Certain parallels can be drawn between Auster’s various novels and these parallels contribute to the various motifs and themes found throughout his work. The importance of space in Auster’s novels is also highlighted with emphasis on liminality which serves as an instigator for transgression to occur between different fictive worlds. / Thesis (MA (English))--North-West University, Potchefstroom Campus, 2013.

Thesis (MA (English))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: This thesis analyses six novels by different women writers, each of which rewrites an originally androcentric biblical story from a female perspective. These novels are The Red Tent by Anita Diamant, The Garden by Elsie Aidinoff, Leaving Eden by Ann Chamberlin, The Moon under her Feet by Clysta Kinstler, The Wild Girl by Michelle Roberts and Wisdom’s Daughter by India Edghill. By classifying these novels as feminist revisionist fiction, this study considers how they both subvert and revise the biblical narratives they are based on in order to offer readers new and gynocentric alternatives. With the intention of establishing the significance of such an endeavor, the study therefore employs the findings of feminist critique and theology to expose how the Bible, as a sexist text, has inspired, directly or indirectly, many of the patriarchal values that govern Western society and religion. Having established how biblical narratives have promoted and justified visions of women as marginal, subordinate and outside the realm of the sacred, we move on to explore how feminist rewritings of such narratives might function to challenge and transform androcentric ideology, patriarchal myth and phallocentric theology. The aim is to show that the new and different stories constructed within these revisionist novels re-conceptualise and re-imagine women, their place in society and their relation to the divine. Thus, as the title suggests, this thesis ultimately considers how women writers ‘steal’ the original biblical stories and transform them in ways that prove liberating for women. / AFRIKAANSE OPSOMMING: Hierdie tesis analiseer ses romans deur verskillende vroue skrywers - romans wat die oorspronklik androsentriese bybelse stories herskryf vanuit ’n vroulike perspektief. Die romans sluit in The Red Tent deur Anita Diamant, The Garden deur Elsie Aidinoff, Leaving Eden deur Ann Chamberlin, The Moon under her Feet deur Clysta Kinstler, The Wild Girl deur Michelle Roberts en Wisdom’s Daughter deur India Edghill. Deur hierdie romans te klassifiseer as feministiese revisionistiese fiksie, oorweeg hierdie studie hoe hulle die bybelse verhale waarop hulle gebaseer is, beide ondermyn en hersien om sodoende lesers nuwe en ginosentriese alternatiewe te bied. Met die voorneme om die betekenisvolheid van so ’n poging vas te stel, wend hierdie tesis dus die bevindings van feministiese kritiek en -teologie aan om bloot te lê hoe die Bybel, as ‘n seksistiese teks, baie van die patriargale waardes van die Westerse samelewing en godsdiens, direk of indirek, geïnspireer het. Nadat vasgestel is hoe bybelse verhale sienings van vroue as marginaal, ondergeskik en buite die sfeer van heiligheid bevorder en regverdig, beweeg die tesis aan om te ondersoek hoe feministiese herskrywings van sulke verhale, androsentriese ideologie, patriargale mite en fallosentriese teologie uitdaag en herskep. Die doelwit is om te wys dat die nuwe en anderste stories saamgestel in hierdie revisionistiese romans, vroue, hul plek in die samelewing en hul betrekking tot die goddelike, kan heroorweeg en herdink. Dus, soos die titel voorstel, oorweeg hierdie tesis primêr hoe vroue skrywers die oorspronklike bybelse stories ‘steel’ en herskep op maniere wat bevrydend vir vrouens blyk te wees.