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STRUCTURAL AND ELECTROCHEMICAL STUDIES OF SILICON- AND CARBON-BASED MATERIALS FOR LI-ION BATTERY APPLICATIONSAl-Maghrabi, Mahdi 02 December 2013 (has links)
Four topics are presented in this thesis. Firstly, a new design for a combinatorial electrochemical cell plate based on circuit board technology is described. The new combinatorial cell plate was tested using sputtered silicon and capacity as a function of mass was determined. The measured specific capacity was 3580 mAh/g, which corresponds to Li15Si4 stoichiometry. The irreversible capacity was measured to be less than 2% of the reversible capacity. This design reduced the spurious capacity that came from the lead pattern of the old plate.
Second, the role of oxygen content on the electrochemical properties of sputtered Si1-xOx was investigated. All the prepared thin film samples had an amorphous or nanostructured nature. The measured specific capacity (first charge) suggests that Si1-xOx is made up of amorphous silicon that reacts reversibly with lithium, and SiO2 that forms inactive Li4SiO4 after the first lithiation. The current study shows that the irreversible capacity is directly proportional to the oxygen content. This study indicates clearly that in order to produce material with high capacity, oxygen should be minimized to reduce Li consumption during Li4SiO4 formation. However, the Si:O ratio should be optimized to get a reasonable active: inactive ratio.
Third, a systematic study to investigate the effect of the addition of carbon on the electrochemical performance of the Sn-Si binary is reported. This study involved the preparation and investigation of three pseudobinary libraries. The addition of carbon was found to inhibit the aggregation of tin and reduce the two-phase coexistence regions as evidenced by smooth differential capacity plots. This was reflected in the improved electrochemical performance such as reversible capacity and cycleability.
Fourth, an investigation of carbon-rich alloys of Fe1-xCx is reported. Both x-ray diffraction and 57Fe Mössbauer spectroscopy were employed to get insight into the structural properties of this system. X-ray diffraction revealed the amorphous or nanostructured nature of all samples with different Fe:C ratios. The distribution of hyperfine parameters extracted from the Mössbauer analysis shows the existence of two components suggesting that Fe exists in two distinct sites: (1) Fe surrounded with Fe neighbors and (2) Fe surrounded with C neighbors. The asymmetric environment was found more pronounced as carbon content increases in the films. This was reflected by high quadrupole splitting in excess of 1.0 mm/s.
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A study of Lu Li's prose and verse Lu Li san wen he san wen shi yan jiu /Ng, Che-ying. January 2008 (has links)
Thesis (M.A.)--University of Hong Kong, 2008. / Includes bibliographical references (p. 73-74).
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Zhuzi de shi li guan ji qi yu li de guan xi zhi yan jiu : yi Zhuzi "Si shu" xue wei zhong xin /Mu, Jian, January 2008 (has links)
Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 330-358).
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A study on Li Qingzhao's Cilun Li Qingzhao "Ci lun" yan jiu /Lee, Ka-man. January 2008 (has links)
Thesis (M.A.)--University of Hong Kong, 2008. / Includes bibliographical references (p. 83-90).
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Li Linfu yu Yang Guozhong zhi bi jiao yan jiuYang, Jinying. January 1900 (has links)
Thesis (Master's)--Si li Zhongguo wen hua xue yuan. / Includes bibliographical references (p. 66-70).
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Li Li-Weng über das Theater eine chinesische Dramaturgie des siebzehnten Jahrhunderts.Martin, Helmut, January 1966 (has links)
Inaug.-Diss.--Heidelberg. / Vita. Bibliography: p. 307-325.
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Li Linfu yu Yang Guozhong zhi bi jiao yan jiuYang, Jinying. January 1900 (has links)
Thesis (Master's)--Si li Zhongguo wen hua xue yuan. / Bibliography: p. 66-70.
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Li Li-Weng über das Theater eine chinesische Dramaturgie des siebzehnten Jahrhunderts /Martin, Helmut, January 1968 (has links)
Thesis (Doctoral)--Ruprecht-Karl-Universität in Heidelberg. / Chinese title on cover and spine: Li Liweng lun xi qu. Vita. Reprint. Originally published: [Heidelberg : s.n.], 1966. Includes bibliographical references (p. 307-325).
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兩宋家禮的延續與活化: 從《書儀》、《文公家禮》及其後續研究= Continuation and revitalization of family rituals in the Song dynasty林嘉穎, 29 June 2016 (has links)
禮起源於人民的日常生活,其內涵包括禮義與禮儀二者。經周公系統化後,禮成為歷代統治者穩定社會的重點教化內容。由於禮的內容複雜繁瑣,一般庶民難有相應的條件來履行當中的種種禮節,故有「禮不下庶人」之說。至宋代,由於市民階級的興起及文化事業的發達,一般庶民對禮的需求日顯殷切,代表地方「小傳統」的家族文化便開始與作為「大傳統」代表的儒家文化相結合。宋明兩代家禮的撰作,便是回應民眾訴求的結果,呈現大小傳統文化的整合情況。家禮作為一種庶民日常家庭生活的常規要求,既要包含許多傳統道德規範,同時也要配合當時的社會風俗。如何磨合協調二者,讓傳統禮學能配合時代所需而加以發展,得以活化,令禮的要義能真正落實,是一個十分有意義的課題,也是本文的研究重點。本文將以儒家哲學精神為切入點,探究《書儀》、《文公家禮》、《家禮儀節》這三本同一體系但不同朝代的家禮著作,歸納其儀節內容如何配合社會的轉變,以貫徹儒家重人情的傳統思想特點。從而辨析司馬光、朱熹、丘濬等人如何訂定冠、昏、喪、祭諸儀,並探究其在變更儀節的同時,能否保留當中的禮義,以延續與活化儒家的傳統思想。藉由本文的討論,期望能進一步明瞭《書儀》、《家禮》、《家禮儀節》三書,如何兼容時代的特色及需要,延續與活化儒家的倫理禮教;希望通過歸納當中重點,重申儒家的普世價值,為今天的社會如何復興儒學提供一個參考點。Abstract In early China, li-rituals stands for a totality of social norms, governing the individual, the family, the rural community, the state and even the international arena of the "civilized world"-Huaxia. However, the li-rituals are mainly practiced among nobles with the exclusion of commoners. Though commoners could be promoted to the ruling class since the Warring-State period, such cases are relatively rare. A great majority of the bureaucrats are from learnt families presumably well-versed in li-rituals. This situation has changed in the Song dynasty. With the keju-examinations in full-swing, many commoners have joined the upper class and the need for practice of li-rituals, as a symbol of social, intellectual and moral upwardness, becomes urgent. To meet this need, Sima Guang, Zhu Xi and Qiu Jun, all scholar-bureaucrats in the Song-Ming Dynasties, endeavored to set a modern version of li-rituals with reference to those in the classics. As li-rituals are by nature conservative and very sensitive to changes, all new practices must be well-justified. This is a study on how these scholars revitalized the li-rituals by making changes appropriate to the contemporary situation and according to what criteria, analyzed how these changes facilitated the standardization of Chinese ritual behavior which enhances our understanding of Chinese society and culture.
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Crenças de professores em formação sobre sua proficiência em língua inglesa: reflexões e perspectivas de açãoCruz, Letícia Telles da 22 July 2013 (has links)
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Leticia Telles da Cruz.pdf: 1702861 bytes, checksum: f2df21ab207296a61e0435e2a70cb9ea (MD5) / Esse trabalho apresenta os resultados de uma pesquisa qualitativa, de caráter
etnográfico, que teve por objetivo investigar as crenças de professores de Língua Inglesa em formação (6º e 8º semestres), do curso de Letras com Inglês, da
Universidade Estadual da Bahia (UNEB), Campus XIV, em relação ao desenvolvimento da competência linguístico-comunicativa, com vistas a colaborar na
formação desses futuros professores. A pesquisa foi norteada pela seguinte
questão-problema: como o reconhecimento das próprias crenças pode contribuir no
processo de ensino/aprendizagem de língua inglesa (LI), e de que forma isso afeta a
formação geral como professor de língua estrangeira (LE)? Para tanto, a pesquisa
se dividiu em dois momentos: o mapeamento das crenças dos sujeitos participantes
e o conhecimento das crenças pelos mesmos. Os dados revelaram que a grande
maioria desses sujeitos acredita que não se aprende inglês na escola pública,
devido à abordagens de ensino insatisfatórias, além da falta de domínio das
habilidades linguísticas, em especial a oral; e não se aprende inglês na
universidade, devido à falta de exposição suficiente à língua. O reconhecimento das
próprias crenças permitiu a esses sujeitos compreenderem a própria cultura de
aprender e mostrou-se eficaz para ajudar na mudança de postura em relação ao
aprendizado de LI, na medida em que passaram a perceber a importância do papel
que exercem nesse processo. Todas as discussões e análises implementadas
seguiram a perspectiva do empoderamento do aprendiz a partir de uma formação
crítica.
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