Browsing by Issue Date, starting with "2009-01-08"

Now showing 1 - 20 of 51599

Composite Modified Electrode Strip
(2009-01-08)
Chen, Sz-Hau
;
Lin, Chih-Sheng
;
Chen, Guan-Tin
;
Lin, Yueh-Hui
;
Shen, Thomas Y.S.
The present invention provides a surface-modified electrode strip for measuring an electrochemical signal that is synergistically amplified by means of a nano-scaled gold particle layer and a lipid-soluble electron mediator layer. A biosensor comprising the electrode strip is also provided.
羊的觀點《綿羊偵探團》
(2009-01-11)
余建良
;
Department of Communication and Technology
;
傳播與科技學系
歹勢改題目...
基於行動裝置之視訊串流可適性媒體播放控制之方法及其系統
(2009-01-11)
莊孝強
;
黃經堯
;
蔣迪豪
一種基於行動裝置之視訊串流可適性媒體播放控制之方法及其系統,主要包括起始値調整以及幀率調整兩部分,其係根據緩衝器起始値資料量以及一併調整幀率之變化量,以決定播放速度。這種可適性媒體播放控制之方法及系統解決了緩衝器溢位(overflow)或缺空(underflow)所造成在視覺品質上損失之問題。並可以在不影響行動通訊系統容量的前提之下,提供視訊串流的使用者,一個平順的播放過程。
寒冬中的共同手勢
(2009-01-11)
陳碩峰
;
Department of Communication and Technology
;
傳播與科技學系
周末的新竹，永有著共同的溫度，11度！在共同的城市裡，共同的溫度，共同的手勢！
第四十一期總編輯的話
(2009-01-11)
《喀報》
;
Department of Communication and Technology
;
傳播與科技學系
寒假休息公告
交大科幻中心推動新科幻熱
(2009-01-11)
楊雅筑
;
Department of Communication and Technology
;
傳播與科技學系
以交大科幻中心為首,帶頭提倡新科幻文化現象
冷到了賞雪知識不可少
(2009-01-11)
邵奕儒
;
Department of Communication and Technology
;
傳播與科技學系
合歡山賞雪
女女戀情《花吃了那女孩》
(2009-01-11)
黃惠琳
;
Department of Communication and Technology
;
傳播與科技學系
無
產業寒冬重新定位再出發
(2009-01-11)
羅兆恆
;
Department of Communication and Technology
;
傳播與科技學系
......
IQ和EQ沒談的《習慣領域》
(2009-01-11)
楊純芳
;
Department of Communication and Technology
;
傳播與科技學系
「命好不如習慣好！」習慣領域（Habitual Domains, HD）」學說的創始人游伯龍自一九七七年開始，從腦與心、行為與決策之關係，深刻體悟人性，並大膽假設人類有「習慣領域」的存在，從此找到改變人類行為得新生力量。
Ordered mesoporous silica particles and Si-MCM-41 for the adsorption of acetone: A comparative study
(2009-01-12)
Hung, Chinte
;
Bai, Hsunling
;
Karthik, Mani
;
環境工程研究所
;
Institute of Environmental Engineering
This study compares the surface properties and the acetone adsorption potentials of mesoporous silica particles (MSPs) and Si-MCM-41. The Si-MCM-41 and MSPs are synthesized, respectively by hydrothermal method and evaporation-induced self-assembly (EISA) method. The results show that the surface area and pore diameter of MSPs are similar to those of Si-MCM-41. But the synthesis of Si-MCM-41 frequently requires longer time and tedious procedure as compared to that of MSPs. The bulk density of MSPs is 3.0-5.0 times higher than that of Si-MCM-41. The mass-based acetone adsorption capacities of these two materials are almost similar. This implies that MSPs have a higher volume-based acetone adsorption capacity than Si-MCM-41 so that less space is required for volatile organic compounds (VOCs) adsorption using MSPs as the adsorbent. The pressure drops of both powder and pellet forms of MSPs are also smaller than those of Si-MCM-41 for adsorbing the same amount of acetone. In addition, as compared to commercial H-ZSM-5 zeolite, both MSPs and Si-MCM-41 reveal better performances on the regeneration ability. As a result, both MSPs and Si-MCM-41 show high adsorption/desorption potential but the MSPs are better as novel adsorbents in terms of overall engineering consideration. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
Study of efficient and stable organic light-emitting diodes with 2-methyl-9,10-di(2-naphthyl)anthracene as hole-transport material by admittance spectroscopy
(2009-01-12)
Ho, Meng-Huan
;
Hsieh, Ming-Ta
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Lin, Kuan-Heng
;
Chen, Teng-Ming
;
Chen, Jenn-Fang
An organic light-emitting device with enhanced efficiency sby employing 2-methyl-9,10-di(2-naphthyl)anthracene (MADN) as hole-transport material (HTM) has been developed. The admittance spectroscopy studies indicate that using MADN as HTM can reduce the amount of hole carriers injected into the device leading to a well-balanced carrier recombination. The green fluorescent 10-(2-benzothiazolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-benzo[l]pyrano-[6,7,8-ij]quinolizin-11-one doped tris(8-quinolinolato)aluminum device achieved a current efficiency of 21.8 cd/A and a power efficiency of 10.4 lm/W at 20 mA/cm(2) that are 65% higher than those of the control device. The green-doped device also achieved a long half-decay lifetime of 22 000 h at an initial brightness of 500 cd/m(2).
Hyperchaos of four state autonomous system with three positive Lyapunov exponents
(2009-01-12)
Ge, Zheng-Ming
;
Yang, Cheng-Hsiung
;
機械工程學系
;
Department of Mechanical Engineering
This Letter gives the results of numerical simulations of Quantum Cellular Neural Network (Quantum-CNN) autonomous system with four state variables. Three positive Lyapunov exponents confirm hyperchaotic nature of its dynamics. (C) 2008 Published by Elsevier B.V.
Identification of Essential Residues of Human alpha-L-Fucosidase and Tests of Its Mechanism
(2009-01-13)
Liu, Sheng-Wen
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Chen, Chao-Sheng
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Chang, Shih-Shen
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Mong, Kwok-Kong Tony
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Lin, Chun-Hung
Fucosylated glycoconjugates have critical roles in biological processes, but a limited availability Of alpha-L-fucosidase has hampered research on this human enzyme (h-Fuc) at a molecular level. After overexpressing h-Fuc in Escherichia coli as an active form, we investigated the catalytic function of this recombinant enzyme. Based on sequence alignment and structural analysis of close homologues of h-Fuc, nine residues of glutamate and aspartate in h-Fuc were selected for mutagenic tests to determine the essential residues. Among the mutants, D225N, E289Q, and E289G lost catalytic activity significantly; their k(cat) values are 1/5700, 1/430, and 1/340, respectively, of that of the wild-type enzyme. The Bronsted plot for k(cat)/K(m) for the E289G mutant is linear with beta(1g) = -0.93, but that for k(cat) is biphasic, with beta(1g) for poor substrates being -0.88 and for activated substrates being -0.11. The small magnitude of Pig for the activated substrates may indicate that the rate-limiting step of the reaction is defucosylation, whereas the large magnitude of the latter Pig value for the poor substrates indicates that the rate-limiting step of the reaction becomes fucosylation. The kinetic outcomes support an argument that ASp(225) functions as a nucleophile and Glu(289) as a general acid/base catalyst. As further evidence, azide significantly reactivated D225G and E289G, and (1)H NMR spectral analysis confirmed the formation of beta-fucosyl azide and alpha-fucosyl azide in the azide rescues of D225G and E289G catalyses, respectively. As direct evidence to prove the function of Glu(289), an accumulation of fucosyl-enzyme intermediate was detected directly through ESI/MS analysis.
Effects of nanomorphological changes on the performance of solar cells with blends of poly[9,9 '-dioctyl-fluorene-co-bithiophene] and a soluble fullerene
(2009-01-14)
Huang, Jen-Hsien
;
Ho, Zhong-Yo
;
Kekuda, Dhananjay
;
Chang, Yung
;
Chu, Chih-Wei
Controlled nanophase segregation within the blended films of a conjugated polymer and a soluble fullerene has enabled us to form a continuous transfer pathway for the carriers, thereby increasing the photocurrent generation for polymer photovoltaic devices. Here, we study the effects of nanomorphological changes on the performance of polymer solar cells using blended films of poly[9,9'-dioctyl-fluorene-co-bithiophene] (F8T2) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Different weight ratios of the F8T2 and PCBM blends in various solvents were studied at different annealing temperatures. The morphology of the films seems to be a strong function of the processing conditions. The power conversion efficiency (PCE) of the photovoltaic devices has improved significantly from 0.34% to 2.14% under air mass 1.5 simulated solar illumination (100 mW cm(-2)), which could be attributed to the nanomorphological changes in the films.
Strain-induced effects on antiferromagnetic ordering and magnetocapacitance in orthorhombic HoMnO3 thin films
(2009-01-14)
Lin, T. H.
;
Shih, H. C.
;
Hsieh, C. C.
;
Luo, C. W.
;
Lin, J-Y
We investigated the magnetic and ferroelectric properties of c-axis oriented orthorhombic phase HoMnO3 (o-HMO in Pbnm symmetry setting) thin films grown on Nb-doped SrTiO3(001) substrates. The o-HMO films exhibit an antiferromagnetic ordering near 42 K, irrespective of the orientation of the applied field. However, an additional magnetic ordering occurring around 35 K was observed when the field was applied along the c-axis of o-HMO, which was absent when the field was applied in the ab-plane. The magnetocapacitance measured along the c-axis showed that although there is evidence of dielectric constant enhancement when the temperature is below 35 K the expected abrupt change in dielectric constant appears at a much lower temperature and reaches maximum around 13.5 K, indicating that the low-temperature c-axis polarization might be related to the ordering of the Ho3+ moment. The lattice constant analyses using x-ray diffraction and the observation of a slight magnetization hysteresis suggest that the weak second magnetic transition along the c- axis at 35 K might be more relevant to the strain-induced effect on antiferromagnetism.
Strain-induced effects on antiferromagnetic ordering and magnetocapacitance in orthorhombic HoMnO(3) thin films
(2009-01-14)
Lin, T. H.
;
Shih, H. C.
;
Hsieh, C. C.
;
Luo, C. W.
;
Lin, J-Y
We investigated the magnetic and ferroelectric properties of c-axis oriented orthorhombic phase HoMnO(3) (o-HMO in Pbnm symmetry setting) thin films grown on Nb-doped SrTiO(3)(001) substrates. The o-HMO films exhibit an antiferromagnetic ordering near 42 K, irrespective of the orientation of the applied field. However, an additional magnetic ordering occurring around 35 K was observed when the field was applied along the c-axis of o-HMO, which was absent when the field was applied in the ab-plane. The magnetocapacitance measured along the c-axis showed that although there is evidence of dielectric constant enhancement when the temperature is below 35 K the expected abrupt change in dielectric constant appears at a much lower temperature and reaches maximum around 13.5 K, indicating that the low-temperature c-axis polarization might be related to the ordering of the Ho(3+) moment. The lattice constant analyses using x-ray diffraction and the observation of a slight magnetization hysteresis suggest that the weak second magnetic transition along the c- axis at 35 K might be more relevant to the strain-induced effect on antiferromagnetism.
Free carrier dynamics of InN nanorods investigated by time-resolved terahertz spectroscopy
(2009-01-15)
Ahn, H.
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Chuang, C. -H.
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Ku, Y. -P.
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Pan, C. -L.
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光電工程學系
Ultrafast time-resolved terahertz spectroscopy is employed to investigate the carrier dynamics of indium nitride (InN) nanorod arrays and an epitaxial film. Transient differential transmission of terahertz wave shows that hot carrier cooling and defect-related nonradiative recombination are the common carrier relaxation processes for InN film and nanorods. However, the electrons confined in the narrow structure of nanorods are significantly affected by the carrier diffusion process near the surface, which causes the abnormally long relaxation time for nanorods.
Damage of light-emitting diodes induced by high reverse-bias stress
(2009-01-15)
Chen, N. C.
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Wang, Y. N.
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Wang, Y. S.
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Lien, W. C.
;
Chen, Y. C.
The ability of a nitride light-emitting diode (LED) to withstand electrostatic discharge (ESD) is important because of the insulating property of the sapphire substrate. Therefore, damage caused by ESD to a nitride LED is a valuable subject. However, damage is caused by ESD in a very short period, so monitoring its evolution is very difficult. Accordingly, ESD experiments are performed and the effects of a high reverse Current (HRC) on devices are investigated. Damage caused by ESD and HRC and their other effects on devices are compared. Four distinct effects of the ESD on devices are illustrated. (c) 2008 Elsevier B.V. All rights reserved.
Spatial complexity in multi-layer cellular neural networks
(2009-01-15)
Ban, Jung-Chao
;
Chang, Chih-Hung
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Lin, Song-Sun
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Lin, Yin-Heng
;
應用數學系
This study investigates the complexity of the global set of output patterns for one-dimensional multi-layer cellular neural networks with input. Applying labeling to the output space produces a sofic shift space. Two invariants, namely spatial entropy and dynamical zeta function, can be exactly computed by studying the induced sofic shift space. This study gives sofic shift a realization through a realistic model. Furthermore, a new phenomenon, the broken of symmetry of entropy, is discovered in multi-layer cellular neural networks with input. (C) 2008 Elsevier Inc. All rights reserved.