Browsing by Issue Date, starting with "2010-09-15"

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Synthesis and Characterization of a Thiadiazole/Benzoimidazole-Based Copolymer for Solar Cell Applications
(2010-09-15)
Chen, Guan-yu
;
Lan, Shang-che
;
Lin, Po-yu
;
Chu, Chih-wei
;
Wei, Kung-hwa
In this study, we synthesized a new polymer, PCTDBI, containing alternating carbazole and thiadiazole-benzoimidazole (TDBI) units. This polymer (number-average molecular weight - 25,600 g mol(-1)), which features a planar imidazole structure into the polymeric main chain, possesses reasonably good thermal properties (T(g) = 105 degrees C; T(d) = 396 degrees C) and an optical band gap of 1.75 eV that matches the maximum photon flux of sunlight. Electrochemical measurements revealed an appropriate energy band offset between the polymer's lowest unoccupied molecular orbital and that of PCBM, thereby allowing efficient electron transfer between the two species. A solar cell device incorporating PCTDBI and PCBM at a blend ratio of 1: 2 (w/w) exhibited a power conversion efficiency of 1.20%; the corresponding device incorporating PCTDBI and PC(71)BM (1: 2, w/w) exhibited a PCE of 1.84%. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 4456-4464, 2010
Characteristics of emission polarization in a-plane nanorods embedded with InGaN/GaN multiple quantum wells
(2010-09-15)
Li, J. C.
;
Lu, T. C.
;
Huang, H. M.
;
Chan, W. W.
;
Kuo, H. C.
Nonpolar (a-plane) GaN nanorod arrays with embedded In(x)Ga(1-x)N/GaN (x=0.09, 0.14, 0.24, and 0.30) multiple quantum wells (MQWs) grown on r-plane sapphire have been fabricated successfully by self-assembled Ni nanomasks and subsequent inductively coupled plasma reactive-ion etching. After nanorod fabrications, the polarization ratio of the emission from MQWs with lower indium composition (x=0.09 and 0.14) slightly decreases but apparently increases by at most 79% for the samples with higher indium composition (x=0.24 and 0.30). Competition between the effect of multiple scattering, strain relaxation and reduction in localized centers, expected in a-plane MQW samples, are attributed to the variations in the polarization ratios after the nanorod formation. (c) 2010 American Institute of Physics. [doi:10.1063/1.3483239]
Compensation effect and differential capacitance analysis of electronic energy band structure in relaxed InAs quantum dots
(2010-09-15)
Chen, J. F.
;
Chen, Ross C. C.
;
Chiang, C. H.
;
Hsieh, M. C.
;
Chang, Y. C.
The use of a differential capacitance technique for analyzing the effect of strain relaxation on the electronic energy band structure in relaxed InAs self-assembled quantum dots (QDs) is presented. Strain relaxation is shown to induce a deep defect state and compensate the ionized impurity in the bottom GaAs layer, leading to a double depletion width and a long emission time. An expression of capacitance at different frequency and voltage is derived for analyzing the experimental data. It has been shown that the relationship between the low-frequency and high-frequency capacitances can be well explained by a Schottky depletion model with a compensated concentration in the bottom GaAs layer. A simple expression is presented to account for the modulation of the free electrons in the top GaAs layer. This capacitance analysis shows a long low-energy tail for the electron ground state, suggesting not very uniform strain relaxation. The results of this study illustrate a carrier compensation effect of the defect state on the electronic energy band structure near the QDs. (C) 2010 American Institute of Physics. [doi:10.1063/1.3467938]
Improvement in output power of a 460 nm InGaN light-emitting diode using staggered quantum well
(2010-09-15)
Liao, Chih-Teng
;
Tsai, Miao-Chan
;
Liou, Bo-Ting
;
Yen, Sheng-Horng
;
Kuo, Yen-Kuang
Staggered quantum well structures are studied to eliminate the influence of polarization-induced electrostatic field upon the optical performance of blue InGaN light-emitting diodes (LEDs). Blue InGaN LEDs with various staggered quantum wells which vary in their indium compositions and quantum well width are theoretically studied and compared by using the APSYS simulation program. According to the simulation results, the best optical characteristic is obtained when the staggered quantum well is designed as In(0.20)Ga(0.80)N (1.4 nm)-In(0.26)Ga(0.74)N (1.6 nm) for blue LEDs. Superiority of this novelty design is on the strength of its enhanced overlap of electron and hole wave functions, uniform distribution of holes, and suppressed electron leakage in the LED device. (C) 2010 American Institute of Physics. [doi:10.1063/1.3471804]
Stability of nanoscale twins in copper under electric current stressing
(2010-09-15)
Chen, Kuan-Chia
;
Wu, Wen-Wei
;
Liao, Chien-Neng
;
Chen, Lih-Juann
;
Tu, K. N.
Migration of {112} incoherent twin boundary (ITB) in nanotwinned Cu under electric current stressing has been observed using in situ high-resolution transmission electron microscopy. The current-driven ITB migration is found to be four orders of magnitude faster than that driven thermally. We propose that electric current plays a role of shuffling Cu atoms at ITB/coherent twin boundary junctions, which enhances nucleation of {112} steps and facilitates twin boundary migration in Cu. By understanding how twin boundaries respond to electric current force we shall be able to trace the property change in nanotwinned Cu under electric current stressing, which would be an essential assessment of interconnect reliability. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3483949]
Spectrofluorometric assay for monoamine-preferring phenol sulfotransferase (SULT1A3)
(2010-09-15)
Lu, Lu-Yi
;
Hsu, Yen-Chang
;
Yang, Yuh-Shyong
;
生物科技學系
;
Department of Biological Science and Technology
A continuous and real-time fluorometric assay for monoamine-preferring phenol sulfotransferase (SULT1A3) was developed. The methodology was based on the coupling of SULT1A1 to regenerate 3'-phosphoadenosine-5'-phosPhosulfate (PAPS) using 4-methylumbelliferyl sulfate (MUS) as a sulfuryl group donor. The fluorophore product (4-methylumbelliferone. MU) was continuously produced and monitored when SULT1A3 catalyzed dopamine sulfation with PAPS. The optimal conditions of this turnover reaction and substrate inhibition of SULT1A3 were also determined. This coupled-enzyme assay allows the continuous measurement of initial reaction velocity and the sensitivity is comparable to that of end-point radioactive isotope assay. (C) 2010 Elsevier Inc. All rights reserved.
Stability of nanoscale twins in copper under electric current stressing
(2010-09-15)
Chen, Kuan-Chia
;
Wu, Wen-Wei
;
Liao, Chien-Neng
;
Chen, Lih-Juann
;
Tu, K. N.
Migration of {112} incoherent twin boundary (ITB) in nanotwinned Cu under electric current stressing has been observed using in situ high-resolution transmission electron microscopy. The current-driven ITB migration is found to be four orders of magnitude faster than that driven thermally. We propose that electric current plays a role of shuffling Cu atoms at ITB/coherent twin boundary junctions, which enhances nucleation of {112} steps and facilitates twin boundary migration in Cu. By understanding how twin boundaries respond to electric current force we shall be able to trace the property change in nanotwinned Cu under electric current stressing, which would be an essential assessment of interconnect reliability. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3483949]
Characteristics of emission polarization in a-plane nanorods embedded with InGaN/GaN multiple quantum wells
(2010-09-15)
Li, J. C.
;
Lu, T. C.
;
Huang, H. M.
;
Chan, W. W.
;
Kuo, H. C.
Nonpolar (a-plane) GaN nanorod arrays with embedded In(x)Ga(1-x)N/GaN (x=0.09, 0.14, 0.24, and 0.30) multiple quantum wells (MQWs) grown on r-plane sapphire have been fabricated successfully by self-assembled Ni nanomasks and subsequent inductively coupled plasma reactive-ion etching. After nanorod fabrications, the polarization ratio of the emission from MQWs with lower indium composition (x=0.09 and 0.14) slightly decreases but apparently increases by at most 79% for the samples with higher indium composition (x=0.24 and 0.30). Competition between the effect of multiple scattering, strain relaxation and reduction in localized centers, expected in a-plane MQW samples, are attributed to the variations in the polarization ratios after the nanorod formation. (c) 2010 American Institute of Physics. [doi:10.1063/1.3483239]
Synthesis and Characterization of PEG-PCL-PEG Triblock Copolymers as Carriers of Doxorubicin for the Treatment of Breast Cancer
(2010-09-15)
Cuong, Nguyen-Van
;
Hsieh, Ming-Fa
;
Chen, Yung-Tsung
;
Liau, Ian
;
應用化學系分子科學碩博班
Triblock copolymers of monomethoxy poly(ethylene glycol) (mPEG) and epsilon-caprolactone (CL) were prepared with varying lengths of poly(E-caprolactone) (PCL) compositions and a fixed length of mPEG segment. The molecular characteristics of triblock copolymers were characterized by NMR, gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). These amphiphilic linear copolymers based on PCL hydrophobic chain and hydrophilic mPEG ending, which can self-assemble into nanoscopic micelles with their hydrophobic cores, encapsulated doxorubicin (DOX) in an aqueous solution. The particle size of prepared micelles was around 40-92 nm. The DOX loading content and DOX loading efficiency were from 3.7-7.4% to 26-49%, respectively. DOX-released profile was pH-dependent and faster at pH 5.4 than pH 7.4. Additionally, the cytotoxicity of DOX-loaded micelles was found to be similar with free DOX in drug-resistant cells (MCF-7/adr). The great amounts of DOX and fast uptake accumulated into the MCF-7/adr cells from DOX-loaded micelles suggest a potential application in cancer chemotherapy. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 3694-3703, 2010
CONTROL METHOD OF TRANSMITTING STREAMING AUDIO/VIDEO DATA AND ARCHITECTURE THEREOF
(2010-09-16)
HUANG, Ching-Yao
;
CHEN, Zhi-Zhan
;
LI, Chun-Hsiao
A control method and architecture for controlling transmission of streaming audio/video data are disclosed. The method uses a report transmission rate on a transmitter to reduce the playback latency on a receiver. The report transmission rate is determined according to an actual transmission rate and the residual data amount of the previous period of a transmitter buffer. The actual transmission rate is the minimum of an available transmission rate and a required transmission rate, which depends on the residual data amount and the report transmission rate. Therefore, the report transmission rate is adjusted according to the accumulation of residual data of transmitter buffer, which improves the playback latency.
定位定量黏著封裝方法與結構
(2010-09-16)
邱俊誠
;
侯冠州
;
林君穎
;
張志瑋
有鑑於習知流體自組裝技術利用親疏水性材料來輔助微小元件定位，本發明提出一種定位定量黏著封裝方法與結構，也就是先將液態膠定位方法，本發明先將第一基板劃分出親水性區域與疏水性區域，點上液態膠於第一基板親水區域上，再利用第二基板靠近第一基板，先保留一間隙於兩基板間，使液態膠藉由毛細現象之吸引力流動分佈於親水性區域，最後，選擇是否將第二基板移開或接合第一基板，若選擇後者，可將第二基板做微流道或置容孔之設計，以有助於後段製程時微小晶粒之定位，並且可防止溢膠的情況產生。
單電感多輸出電源轉換器及其控制方法
(2010-09-16)
陳科宏
;
黃銘信
一種單電感多輸出電源轉換器及其控制方法，包括一電感具有第一端及第二端，該電感的第一端連接該電源轉換器的輸入端，該電感的第二端在該電源轉換器的多個輸出端、該電源轉換器的輸入端及一接地端之間做切換。
Using decision rules to achieve mass customization of airline services
(2010-09-16)
Liou, James J. H.
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Yen, Leon
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Tzeng, Gwo-Hshiung
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科技管理研究所
;
Institute of Management of Technology
This paper uses the Dominance-based Rough Set Approach (DRSA) to formulate airline service strategies by generating decision rules that model passenger preference for airline service quality. DRSA could help airlines eliminate some services associated with dispensable attributes without affecting passenger perception of service quality. DRSA could also help airlines achieve mass customization of airline services and generate additional revenues by active or passive targeting of quality services to passengers. (C) 2009 Published by Elsevier B.V.
升降壓電源轉換器及其控制方法以及應用在該升降壓電源轉換器的鋸齒波產生器及其方法
(2010-09-16)
陳科宏
;
黃柄境
;
何心欣
一種升降壓電源轉換器包括一功率級用以將一輸入電壓轉為一輸出電壓,一誤差放大器根據一與該輸出電壓具有比例關係的回授信號及一參考電壓產生一誤差信號,一鋸齒波產生器提供兩組鋸齒波信號,以及兩組比較器根據該誤差信號及該兩組鋸齒波信號產生兩組控制信號用以驅動該功率級。該兩組鋸齒波信號其中之一的峰値隨該輸入電壓改變,另一組鋸齒波信號的谷値隨該輸入電壓改變,因而可以加快線性暫態響應,避免因該輸入電壓變化而造成該輸出電壓的不穩定。
升降壓式電源轉換器及其控制方法
(2010-09-16)
陳科宏
;
吳緯權
;
何心欣
一種升降壓式電源轉換器及其控制方法，其在該電源轉換器的輸入電壓接近輸出電壓時延長開關的切換週期並使用新的開關順序來改善切換損失及導通損失，並且考慮負載電流對責任週期的影響使其可在正確點切換模式，因此該輸出電壓不會因為改變模式而受影響。
多群組電極陣列的電極刺激系統及其方法
(2010-09-16)
蔡德明
;
徐建華
本發明係揭露一種多群組電極陣列的電極刺激系統及其方法，多群組電極陣列的電極刺激系統包含植入本體、電極陣列及電極控制器。植入本體具有承載面，承載面設置有電極陣列。電極陣列具有多個電極群組，電極群組具有多個電極，電極分別具有獨立的電源控制。電極控制器接收控制訊號以驅動一組對應電極，此組對應電極包含至少兩個電極，並透過獨立的電源控制調整供給此組對應電極電源，經由電交互作用使產生介於此組對應電極間的虛擬頻道。
BUBBLELESS PACKAGING METHOD
(2010-09-16)
FAN, Shih-Kang
;
Hsu, Ching-Hsiang
;
Chiu, Cheng-Pu
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Mo, Chi-Neng
;
Chiang, Mei-Tsao
A bubbleless packaging method is provided. The method is applicable to package a display element. In the method, firstly, a first substrate and a first protective layer are provided. The first protective layer is formed on the first substrate. Then, a second substrate and a second protective layer are provided. The second protective layer is formed on the second substrate. Then, a plasma treatment is performed on surfaces of the first protective layer and the second protective layer. Then, the first substrate and the second substrate are dipped into a solution after the plasma treatment. Then, the first substrate and the second substrate are laminated in the solution, wherein the first protective layer faces the second protective layer. Finally, the first substrate and the second substrate are taken out from the solution.
倒車影像輔助系統及方法
(2010-09-16)
吳炳飛
;
陳昭榮
;
陳盈翰
;
高志忠
;
楊錚諺
一種倒車影像輔助系統，包括影像擷取裝置、顯示裝置以及影像分析裝置，其中影像擷取裝置擷取車輛後方之倒車影像，並由影像分析裝置對倒車影像進行分析，以決定倒車影像中之起始線，兩條側線與輔助線，而起始線與側線構成停車區域，且輔助線是平行起始線。影像分析裝置依據車輛上的特定位置決定第一參考點，依據位於這些側線之間的起始線區段決定第二參考點，依據位於這些側線之間的輔助線區段決定第三參考點。影像分析裝置並依據這些參考點決定建議倒車路徑，而將倒車影像與建議倒車路徑傳送至顯示裝置，以使顯示裝置顯示出疊加之倒車影像與建議倒車路徑。
HIGH EFFICIENCY BUCK-BOOST POWER CONVERTER
(2010-09-16)
CHEN, KE-HORNG
;
WU, WEI-QUAN
;
HO, HSIN-HSIN
A buck-boost power converter switches the switches thereof with a novel sequence and extends the switching periods of the switches to reduce the switching loss and conduction loss when the input voltage thereof approaches the output voltage thereof. The influence of the load current of the power converter on the duty thereof is taken into account to switch the power converter between modes at correct time points, so as to prevent the output voltage from being affected by the mode switching.
Doping dependence of the ultrafast electronic dynamics of Y1-xPrxBa2Cu3O7-delta thin-film superconductors from femtosecond optical spectroscopy
(2010-09-17)
Luo, C. W.
;
Lo, H. P.
;
Su, C. H.
;
Wu, I. H.
;
Chen, Y. -J.
Time-domain spectroscopy, which probes the dynamics of the electronic states near Fermi surface that are associated with superconductivity, has proven to be a powerful method for providing insights into the fundamental nature of both pseudogap and superconducting gap. This study shows that the unique T-x phase diagram with the time-evolving ultrafast dynamics of Y1-xPrxBa2Cu3O7-delta can be used to identify clearly the Nernst, pseudogap, and superconducting regions. All of the orders appear together at a specific delay time, such as 1.2-3 ps, after pumping by an ultrashort pulse. These discoveries suggest that the Nernst effect, the pseudogap and even superconductivity may have the same physical origin.