17,482 research outputs found
Steady-state analysis and simulation of a BJT self-oscillatingZVS-CV ballast driven by a saturable transformer
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Buddhist sculpture of Wu Yueh, 907-978: Chinese sculpture of the tenth century
No full textThe dissertation explores the Buddhist sculpture of Wu Yueh within the general context of tenth-century Chinese sculpture of the Five Dynasties period. Wu Yueh (a southern kingdom in the present day Chekiang region) was especially known for its support of Buddhism. The ruling house of Wu Yueh, the Ch'ien family, was devoted to Buddhism and patronized the construction of many Buddhist temples and statues.The thesis first offers an investigation of the political, economic, social and religious background of Wu Yueh in terms of the relations between Wu Yueh and other southern kingdoms and northern dynasties. In order to provide a context for assessing Wu Yueh Buddhist art, the thesis presents a general discussion of Chinese Buddhist sculpture from the mid ninth century to the late tenth century.The thesis analyzes surviving Wu Yueh sculpture at Tz'u-yun-ling, Yen-hsia grotto, T'ien-lung ssu in the Hang-chou area as well as other Buddhist statues recently excavated in the Tiger-Hill Pagoda at Su-chou, which are of high quality and reflect a variety of subject matter. These Wu Yueh sculptures serve as the crucial evidence that the elegant, pictorial, and static style of Sung sculpture was established according to both a modified T'ang sculptral tradition and a new style and iconography that arose during the Five Dynasties period.Made available in DSpace on 2011-05-07T13:18:27Z (GMT). No. of bitstreams: 2
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白金微粒/Ru錯合物/高分子薄磨修飾電極之製備及其電催化應用
No full text[[abstract]]Membrane-metal modified cells are usually applied to the field of membrane cells, such as fuel cells, light cells… etc. Some hydrogen evolution catalysts, for example Pt metal, are used as the cathodes in these cells. Therefore, in this research, we try to dose a series of Ru complexes into the intervals between the cathode and the thin film electrode to improve the hydrogen evolution efficiency of the membrane-metal modified cells.
Ru complex (chosen from Ru(bpy)2phenNH2, Ru(dmb)2 phenNH2, Ru(tmb)2phenNH2, Ru(bpy)2Cl2, Ru(dmb)2Cl2, Ru(tmb)2Cl2) doped Nafion solution was drop-coated onto glassy carbon (GC) electrode and formed a thin film after drying. Then, the GC electrode was immersed into H2PtCl6 solution, and the Pt/Ru complex/polymer modified electrode was obtained by reducing Pt with a DPTB method. Different amount of Pt was electroplated on the GC electrode even at the same conditions (the same potential, the same time interval) when different consistency or kinds of Ru complexes were used, suggesting the influence of the ligands on the red-ox property of Ru complexes. The effective surface area (estimated by CV method) of Pt in the modified electrode is also varied with different species of Ru complexes, which in turn affect on the efficiency of hydrogen evolution.
Furthermore, from the information obtained by SEM and EDS, the alignment and the density of Pt particles growing on the GC electrode are figured out. From the fluorescence lifetime and luminescence spectra, a good electron-transfer is considered to have occurred between D series Ru complexes and Pt modified electrode that explained why a high hydrogen evolution efficiency has been obtained. The modified electrodes are still stable one month after fabricated and their hydrogen evolution efficiency was as good as a newly prepared one.
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