本論文期望藉由探究《陽光下的葡萄乾》一劇，對非裔美人在面對社會困境以及白人意識型態時，如何發展自我認同的議題啟發新的思考。蘿琳．漢司白瑞以寫實的寫作手法，呈現非裔美人在美國一九五○年代種族隔離區的生活。種族隔離政策(segregation laws)中，空間具有特別的指涉意義，因此本文選擇米哈依爾．巴赫汀(Mikhail Bakhtin)的「時空型」(chronotope)理論作為本論文的基本架構。由於劇本和其當代歷史相互輝映，歷史背景的研究可以幫助理解劇中人物動機；反之，由解析劇中情節和人物行為，亦可推測非裔美人的未來發展。 本論文分為四個章節。第一章提供作者生平、劇本、評論、以及理論架構的基本介紹。第二章有兩個主題：呈現作品如何反映歷史，以及從社會背景的角度詮釋角色。其中，弗朗茲．法農(Frantz Fanon)的《黑皮膚，白面具》幫助解釋部分角色的同化行為。第三章顯示非裔美人如何在白人霸權之下建立自我認同：在社會上表達訴求以對抗白人霸權，在文化上接納非洲本能和美洲文化，及在家庭方面堅守傳承下來的家庭尊嚴。史都華．霍爾( Stuart Hall)的離散理論(diaspora)特別用來處理其中同時具有非洲和美洲本質的文化議題。第四章則是本論文的結論，總結作者寫本劇的信念和目的。 / This thesis studies A Raisin in the Sun and expects to bring new inspirations of how African Americans develop their own identities confronting social plights and white ideology. With the realistic writing style, Lorraine Hansberry truthfully depicts and reflects African Americans’ life in the segregated ghetto in the 1950s. As space carries significant meanings in the enforced segregation laws, Mikhail Bakhtin’s chronotope serves as the main theoretical framework of this thesis. The play is interconnected with its contemporary history, so we may interpret the characters by considering their historical background and infer the American blacks’ future path by scrutinizing the plot and actions in the play. This thesis consists of four chapters. Chapter One is an introduction to the author’s life, the play, the critical opinions, and the theoretical framework. In Chapter Two, there are two main issues: first, how this play reflects the historical background, and second, interpretation of characters in relation to their specific social contexts. Frantz Fanon’s Black Skin, White Masks is applied to explain the potential of assimilation of some characters. Chapter Three reveals how African Americans under the white hegemony find their own identities in social, cultural, and family perspectives. The gist is that they must strive for the improvement of their social status, embrace both African and American cultural roots, and stick to their family pride. Stuart Hall’s theory on diaspora is useful to deal with the cultural identity which ambiguously covers both African and American essences. Chapter Four is the conclusion of the thesis that sums up the author’s belief and intention in writing the play.

Ce travail de doctorat traite l’optimisation des méthodes d’extraction des composés phénoliques à partir des sous-produits de la viticulture et de la viniculture, à savoir les sarments de vigne et les marcs de raisins. Plusieurs technologies innovantes sont appliquées et comparées : l’extraction accélérée par solvant (EAS), les décharges électriques de haute-tension (DEHT), les ultrasons (US) et les champs électriques pulsés (CEP). Les extractions solide-liquide faites sur les sarments ont montré que, parmi les solvants étudiés, l’eau est le moins efficace. L’ajout de la β-cyclodextrine dans l’eau améliore le procédé d’extraction mais est moins efficace que les mélanges hydroéthanoliques. L’extraction en milieu alcalin donne le meilleur rendement en composés phénoliques. L’intensification de l’extraction des composés phénoliques des sarments est possible grâce aux nouvelles technologies d’extraction. L’efficacité des méthodes testées est la moindre avec les US, moyenne avec les CEP pour atteindre le meilleur rendement phénolique avec les DEHT. La filtrabilité de ces extraits est d’autant plus lente que leur composition est complexe. L’ultrafiltration membranaire permet une très bonne purification et concentration des composés phénoliques. L’étude des mécanismes d’action des DEHT a permis d’identifier les phénomènes favorisant l’extraction des composés phénoliques à partir des sarments. Un effet mécanique des DEHT, capable de fragmenter les sarments, est en majorité responsable de cette amélioration. Le procédé énergivore du broyage pourra alors être omis. Un effet électrique contribuant également à l’intensification du procédé d’extraction est démontré. La formation de peroxyde d’hydrogène durant le traitement par DEHT est quantifiée mais ne semble pas altérer les composés phénoliques qui sont des molécules à capacité antiradicalaire élevée. Quant aux études portées sur les marcs de raisins, la variation simultanée de plusieurs paramètres opératoires a permis l’optimisation de l’extraction aqueuse et hydroéthanolique des composés phénoliques en ayant recours à la méthodologie de surface de réponse (MSR). Le passage d’un milieu aqueux à un milieu hydroéthanolique a permis d’améliorer nettement le procédé d’extraction solide-liquide des composés phénoliques et l’utilisation de l’EAS a permis l’augmentation du rendement en composés phénoliques jusqu’à trois fois par rapport à l’optimum obtenu en milieu hydroéthanolique. / This study deals with the optimization of the extraction methods of phenolic compounds from viticulture and viniculture by-products, namely vine shoots and grape pomace. Several innovative technologies were tested and compared: high voltage electrical discharges (HVED), accelerated solvent extraction (ASE), ultrasounds (US) and pulsed electric fields (PEF). The solid-liquid extraction conducted on vine shoots showed that, amongst the studied solvents, water is the least effective. The addition of the β-cyclodextrin to water improves the extraction process but remains less effective than that with hydroethanolic mixtures. The extraction in alkaline medium gives the highest phenolic compound extraction yields. The intensification of phenolic compound extraction from vine shoots was possible thanks to new extraction technologies. The effectiveness of the tested methods was the least with US, followed by PEF to accomplish the highest phenolic yield with HVED. The filterability of the extracts was slower when their composition was complex, and the membrane technology allowed a good purification and concentration of phenolic compounds. The reason behind the high effectiveness of HVED was investigated. The action mechanisms of HVED were studied in details. A mechanical effect of HVED provoked vine shoots fragmentation and particle size reduction. This was the main phenomenon responsible for the intensification of the extraction process. It also suggested that a grinding pretreatment would not be necessary prior to HVED, which considerably diminishes the energy input of the overall process. The presence of a non-mechanical effect and its contribution in the efficiency of HVED were also shown. The formation of hydrogen peroxide during the treatment was observed. However it did not seem to alter vine shoot phenolic compounds since these demonstrated a high radical scavenging capacity. As for the studies conducted on grape pomace, the simultaneous variation of several operating parameters allowed the aqueous and hydroethanolic optimization of phenolic compound extraction from these byproducts by response surface methodology (RSM). The passage from an aqueous to a hydroethanolic medium clearly improved the solid-liquid extraction of phenolic compounds from grape pomace. The use of ASE further increased the phenolic compound yield up to three times as compared to the optimum obtained with a hydroethanolic solvent.