Browsing by Issue Date, starting with "2009-08-15"

Now showing 1 - 20 of 50097

Characteristics of a-Plane Green Light-Emitting Diode Grown on r-Plane Sapphire
(2009-08-15)
Ling, Shih-Chun
;
Wang, Te-Chung
;
Chen, Jun-Rong
;
Liu, Po-Chun
;
Ko, Tsung-Shine
In this work, we have successfully grown a-plane green light-emitting diodes (LEDs) on r-plane sapphire and investigated the device characteristics of a-plane green LEDs. The apparent emission polarization anisotropy was observed and the polarization degree was as high as 67.4%. In addition, the electroluminescence (EL) spectra first revealed a wavelength blue-shift with increasing drive current to 20 mA, which could be attributed to the band-filling effect, and then the EL peak become constant. The current-voltage curve showed the forward voltage of a-plane LED grown on r-plane sapphire substrate was 3.43 V and the differential series resistance was measured to be about 24 Omega as 20-mA injected current. Furthermore, the output power was 240 mu W at 100-mA drive current.
Generation of sub-20-fs multicolor laser pulses using cascaded four-wave mixing with chirped incident pulses
(2009-08-15)
Liu, Jun
;
Kobayashi, Takayoshi
;
電子物理學系
;
Department of Electrophysics
Negatively chirped or nearly transform-limited output pulses can be obtained in a four-wave mixing process when one of the pump beams is negatively chirped and the other is positively chirped. Nearly transform-limited 16 fs multicolor laser pulses are obtained in a fused-silica glass plate using this method. The resulting frequency shifts and compressed multicolor sidebands are continuously tunable in wavelength by varying the crossing angle between the two input beams. Sub-10-fs multicolor pulses should be possible obtained using this method in the future. (C) 2009 Optical Society of America
Thermal analysis on the degradation of poly-silicon TFTs under AC stress
(2009-08-15)
Weng, C. F.
;
Chang, T. C.
;
Tai, Y. H.
;
Huang, S. T.
;
Wu, K. T.
In this work, the degradation mechanism of N-channel poly-silicon thin-film transistor (poly-Si TFT) has been investigated under dynamic voltage stress at room temperature. The ON-current of TFT is degraded to as low as 0.3 times of the initial value after 1000 s stress. On the other hand, both the sub-threshold swing and threshold voltage kept well during the AC stress. The current crowding effect was rapidly increased with increasing of stress duration. However, comparing the initial and degraded characteristics at rising temperature, namely, 150 degrees C, the ON-current of TFT only decrease to 75% of the initial value after 1000 s AC stress. It depicts that creation of effective trap density in tail-states of poly-Si film is responsible for the electrical degradation of poly-Si TFT. At high temperature, electron has enough energy to pass the energy barrier created by ac stress and the degradation is less obvious. (C) 2009 Published by Elsevier B.V.
Diversity of traveling wave solutions in FitzHugh-Nagumo type equations
(2009-08-15)
Hsu, Cheng-Hsiung
;
Yang, Ting-Hui
;
Yang, Chi-Ru
;
應用數學系
;
Department of Applied Mathematics
In this work we consider the diversity of traveling wave solutions of the FitzHugh-Nagumo type equations u(t) = u(xx) + f (u, w), w(t) = epsilon g(u, w), where f(u, w) = u(u - a(w))(1 - u) for some smooth function a(w) and g(u, w) = u - w. When a(w) crosses zero and one, the corresponding profile equation possesses special turning points which result in very rich dynamics. In [W. Liu, E. Van Vleck, Turning points and traveling waves in FitzHugh-Nagumo type equations. J. Differential Equations 225 (2006) 381-410], Liu and Van Vleck examined traveling waves whose slow orbits lie only on two portions of the slow manifold, and obtained the existence results by using the geometric singular perturbation theory. Based on the ideas of their work, we study the co-existence of different traveling waves whose slow orbits could involve all portions of the slow manifold. There are more complicated and richer dynamics of traveling waves than those of [W. Liu, E. Van Vleck, Turning points and traveling waves in FitzHugh-Nagumo type equations, J. Differential Equations 225 (2006) 381-410]. We give a complete classification of all different fronts of traveling waves, and provide an example to support our theoretical analysis. (C) 2009 Elsevier Inc. All rights reserved.
Theory of ZEKE spectroscopy and molecular Rydberg dynamics
(2009-08-16)
Chao, Sheng Der
;
Wang, Yi Hsieh
;
Lin, Sheng Hsien
;
Selzle, Heinrich L.
;
Neusser, Hans J.
Molecular insight into catalytic mechanism of spinosyn rhamnosyltransferase by in vitro combinatorial reactions with NDP-sugar-modifying enzymes
(2009-08-16)
Chiu, Hsien-Tai
;
Chen, Yi-Lin
;
Lin, Yu-Chin
;
Chen, Yi-Hsine
;
生物科技學系
COLL 327-Sol-gel synthesis and surface reaction of oxygen plasma for flexible metal-insulator-metal devices
(2009-08-16)
Chu, Min-Ching
;
Lin, Ching-Chang
;
You, Hsin-Chiang
;
Ko, Fu-Hsiang
;
材料科學與工程學系奈米科技碩博班
ENVR 32-Fabrication of novel Cu/TiO2-based imprinted polymers for detection of phosphine
(2009-08-16)
Chang, Sue-Min
;
Hsu, Ying-Ya
;
Yen, Shao-I
;
Li, Shou-Nan
;
環境工程研究所
Crystal structure of aminoacylhistidine dipeptidase from vibrio alginolyticus, a metallopeptidase with dinuclear metal center.
(2009-08-16)
Chang, Chin Yuan
;
Wu, Tung-Kung
;
生物科技學系
;
Department of Biological Science and Technology
COLL 123-Effects of surface properties and textures of imprinted silica on recognition of bisphenol A
(2009-08-16)
Hsu, Shu-Kang
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
Thermostable direct hemolysin from Grimontia hollisae exhibits Arrhenius effect and in vitro cytotoxicity
(2009-08-16)
Huang, Sheng Cih
;
Wang, Yu-Kuo
;
Wu, Tung-Kung
;
生物科技學系
;
Department of Biological Science and Technology
奈米熱電裝置的製造方法
(2009-08-16)
朝春光
;
陳蓉萱
;
楊大緯
本發明係揭露一種奈米熱電裝置的製造方法,提供至少一模板,而該模板具有一組奈米孔洞,在模板底部形成一基板之後,將一半導體之熔融金屬液注入該組奈米孔洞中,以形成一組半導體奈米線,再來去除該基板,以得到一半導體奈米線陣列,最後利用一金屬導體以串聯方式連結至少二半導體奈米線陣列,形成熱電元件,此熱電元件係具有較高的熱電轉換效率。
ANYL 207-Miniaturized chemiluminescent photocurrent system for biomolecular sensing
(2009-08-16)
Chu, Min-Ching
;
Lin, Ching-Chang
;
Lin, Chie-Chieh
;
Ko, Fu-Hsiang
;
材料科學與工程學系奈米科技碩博班
Photo-induced chemical reduction of NADP plus by reconstituted metalloporphyrin myoglobin: An artificial photosynthesis model for photosystem I
(2009-08-16)
Chang, Chin-Hao
;
Wu, Tung-Kung
;
生物科技學系
;
Department of Biological Science and Technology
Effect of surface acidity on proton conductivity of sulfated and phosphated zirconia
(2009-08-16)
Sung, Pin-Hsin
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
Altering oxidosqualene cyclization from chair-boat-chair to chair-chair-chair biosynthetic route by a single amino acid substitution at the phenylalanine 699 position of the Saccharomyces cerevisiae oxidosqualene-lanosterol cyclase
(2009-08-16)
Wu, Tung-Kung
;
應用化學系分子科學碩博班
;
Institute of Molecular science
Preliminary structure determination and functional residues characterization of thermostable direct hemolysin from Grimontia hollisae
(2009-08-16)
Wang, Yu-Kuo
;
Huang, Sheng-Cih
;
Wu, Tung-Kung
;
生物科技學系
;
Department of Biological Science and Technology
Tryptophan 587 within oxidosqualene-lanosterol cyclase from Saccharomyces cerevisiae influences substrate binding
(2009-08-16)
Liu, Yuan-Ting
;
Shie, Wen-Shiang
;
Wu, Tung-Kung
;
生物科技學系
;
Department of Biological Science and Technology
ENVR 196-Photocatalytic behavior of salicylic acid modified TiO2 for degradation of Bisphenol A
(2009-08-16)
Chang, Sue-Min
;
Chang, Chen-Tuan
;
環境工程研究所
;
Institute of Environmental Engineering
CH3NO2 decomposition/isomerization mechanism and product branching ratios: An ab initio chemical kinetic study
(2009-08-17)
Zhu, R. S.
;
Lin, M. C.
;
交大名義發表
;
National Chiao Tung University
The low-lying energy pathways for the decomposition/isomerization of nitromethane (NM) have been investigated using different molecular orbital methods. Our results show that in addition to the commonly known CH3 + NO2 products formed by direct C-N bond breaking and the trans-CH3ONO formed by nitro-nitrite isomerization, NM can also isomerize to cis-CH3ONO via a very loose transition state (TS) lying 59.2 kcal/mol above CH3NO2 or 0.6 kcal/mol below the CH3 + NO2 asymptote predicted at the UCCSD(T)/CBS level of theory. Kinetic results indicate that in the energy range of 59 +/- 1 kcal/mol, production of CH3O + NO is dominant, whereas above the C-N bond breaking threshold, the formation of CH3 + NO2 sharply increases and becomes dominant. The k(E) values predicted at different energies clearly indicate that CH3O + NO could be detected in an infrared multi-photon dissociation study, whereas in UV dissociation experiments with energies high above the C-N bond breaking threshold the CH3 + NO2 products are generated predominantly. (C) 2009 Elsevier B. V. All rights reserved.