Browsing by Issue Date, starting with "2009-05-25"

Now showing 1 - 20 of 50672

Intramolecular Donor-Acceptor Regioregular Poly(hexylphenanthrenyl-imidazole thiophene) Exhibits Enhanced Hole Mobility for Heterojunction Solar Cell Applications
(2009-05-25)
Chang, Yao-Te
;
Hsu, So-Lin
;
Su, Ming-Hsin
;
Wei, Kung-Hwa
;
材料科學與工程學系
PHPIT, a new kind of intramolecular donor-acceptor side-chain-tethered hexyl-phenanthrenyl-imidazole polythiophene, is synthesized. The more balanced electron and hole mobilities and the enhanced visible- and internal-light absorptions in the devices consisting of annealed PHPIT/PCBM blends both contribute to a much higher short-circuit current density, which in turn led to a power conversion efficiency as high as 4.1%.
Tunable optical wavelength conversion of OFDM signal using a periodically-poled lithium niobate waveguide
(2009-05-25)
Wu, Xiaoxia
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Peng, Wei-Ren
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Arbab, Vahid
;
Wang, Jian
;
Willner, Alan
We experimentally demonstrate tunable optical wavelength conversion of a 10-Gb/s radio frequency (RF)-tone assisted orthogonal-frequency-division-multiplexing (OFDM) signal with similar to-5 dB (similar to 30%) efficiency over similar to 30 nm bandwidth using a periodically-poled lithium-niobate (PPLN) waveguide. A penalty of < 3 dB is obtained after wavelength conversion. Quadrature amplitude modulation (QAM) size and subcarrier number are varied to further evaluate the performance of the wavelength converter. (C) 2009 Optical Society of America
Far-field of GaN film-transferred green light-emitting diodes with two-dimensional photonic crystals
(2009-05-25)
Lai, Chun-Feng
;
Chi, Jim-Yong
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Kuo, Hao-Chung
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Yen, Hsi-Hsuan
;
Lee, Chia-En
Far-field distributions of GaN-based photonic crystal (PhC) film-transferred light-emitting diodes (FT-LEDs) were investigated. The thickness of the device is about 840 nm. The emission wavelength is around 520 nm. The PhC region is a square lattice with a/lambda around 0.5. Angular-resolved measurements in the Gamma-X and Gamma-M directions were made in the polarized-resolved manner. Guided mode extraction behavior in agreement with the two-dimensional free-photon band calculation was observed. In addition, the pseudo-TM behavior for the non-collinearly coupled modes was observed. The azimuthal-mapping of the angular-resolved spectra revealed the evolution of the collinearly and the non-collinearly coupled modes. Furthermore, the light enhancement of similar to 2.7x and the collimation angle about 102.3 degrees were achieved. (c) 2009 Optical Society of America
Generation of broadband two-dimensional multicolored arrays in a sapphire plate
(2009-05-25)
Liu, Jun
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Kobayashi, Takayoshi
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Wang, Zhiguang
;
電子物理學系
;
Department of Electrophysics
Broadband 2-D multicolored arrays with more than ten periodic columns and more than ten rows were generated in a sapphire plate using two crossed femtosecond laser beams overlapping in time and space. These multicolored 2-D arrays were sensitive to rotation of the sapphire plate in the plane normal to the incident beams. The broadband spectrum, pulse duration less than 40fs, and less than 1%RMS power stability of the array signals make them well suited for various applications, for example multicolor pump-probe experiments. (C) 2009 Optical Society of America
High output power density from GaN-based two-dimensional nanorod light-emitting diode arrays (vol 94, 141111, 2009)
(2009-05-25)
Lee, Ya-Ju
;
Lin, Shawn-Yu
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Chiu, Ching-Hua
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Lu, Tien-Chang
;
Kuo, Hao-Chung
Self-Assembly Structures through Competitive Interactions of Crystalline-Amorphous Diblock Copolymer/Homopolymer Blends: Poly(epsilon-caprolactone-b-4-vinyl pyridine)/Poly(vinyl phenol)
(2009-05-26)
Chen, Wan-Chun
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Kuo, Shiao-Wei
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Lu, Chu-Hua
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Jeng, U-Ser
;
Chang, Feng-Chih
A series of immiscible crystalline-amorphous diblock copolymers, poly(epsilon-caprolactone)-b-(4-vinyl pyridine) (PCL-b-P4VP), were synthesized through combination of sequential ring-opening and controlled living free radical (nitroxide-mediated) polymerizations and then blended with poly(vinyl phenol) (PVPh) homopolymer. Miscibility and self-assembly morphologies mediated by hydrogen-bonding interactions of this new A-B/C type polymer blend are discussed in detail. Self-assembly morphologies of these immiscible PCL-b-P4VP diblock copolymers change through competitive hydrogen-bonding interactions with the increase of PVPh contents The SAXS profiles also reveal a sharp primary peak and highly long-range order reflections such as cylinder or sphere structure at relatively lower PVPh content, which is consistent with TEM images. DSC, WAXD, and FT-IR analyses provide positive evidence that the pyridine group of P4VP is a significantly stronger hydrogen-bond acceptor than the carbonyl group of PCL with the hydroxyl group of PVPh and results in the excluded and confined PCL phase.
A method of layer-by-layer gold nanoparticle hybridization in a quartz crystal microbalance DNA sensing system used to detect dengue virus
(2009-05-27)
Chen, Sz-Hau
;
Chuang, Yao-Chen
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Lu, Yi-Chen
;
Lin, Hsiu-Chao
;
Yang, Yun-Liang
Dengue virus (DENV) is nowadays the most important arthropod-spread virus affecting humans existing in more than 100 countries worldwide. A rapid and sensitive detection method for the early diagnosis of infectious dengue virus urgently needs to be developed. In the present study, a circulating-flow quartz crystal microbalance (QCM) biosensing method combining oligonucleotide-functionalized gold nanoparticles (i.e. AuNP probes) used to detect DENV has been established. In the DNA-QCM method, two kinds of specific AuNP probes were linked by the target sequences onto the QCM chip to amplify the detection signal, i.e. oscillatory frequency change (Delta F) of the QCM sensor. The target sequences amplified from the DENV genome act as a bridge for the layer-by-layer AuNP probes' hybridization in the method. Besides being amplifiers of the detection signal, the specific AuNP probes used in the DNA-QCM method also play the role of verifiers to specifically recognize their target sequences in the detection. The effect of four AuNP sizes on the layer-by-layer hybridization has been evaluated and it is found that 13 nm AuNPs collocated with 13 nm AuNPs showed the best hybridization efficiency. According to the nanoparticle application, the DNA-QCM biosensing method was able to detect dengue viral RNA in virus-contaminated serum as plaque titers being 2 PFU ml(-1) and a linear correlation (R(2) = 0.987) of Delta F versus virus titration from 2 x 10(0) to 2 x 10(6) PFU ml(-1) was found. The sensitivity and specificity of the present DNA-QCM method with nanoparticle technology showed it to be comparable to the fluorescent real-time PCR methods. Moreover, the method described herein was shown to not require expensive equipment, was label-free and highly sensitive.
DISPLAY
(2009-05-28)
Fan, Shih-Kang
;
Chiu, Cheng-Pu
;
Mo, Chi-Neng
;
Chiang, Mei-Tsao
A display including a first substrate, a first electrode, a second substrate, a second electrode, and a mixed solution is provided. The first electrode is disposed on the first substrate, and the second electrode is disposed on the second substrate. In addition, the mixed solution is disposed between the first electrode and the second electrode. Moreover, the mixed solution includes a solution and a plurality of first neutral micro-particles disposed in the solution.
LCD with ambient light sense function and method thereof
(2009-05-28)
Tai, Ya-Hsiang
;
Ho, Han-Ching
;
Cheng, Chia-Pin
The invention discloses an LCD with an ambient light sense function and its method. The method compraises the step of: coupling a capacitor to a source electrode of a thin film transistor; calculating a transmission time which required by a potential change from the reduction of electric charges; and finally, calculating an intensity of the ambient light according to the transmission time. The invention further discloses an ambient light sense circuit having a thin film transistor, a capacitor and a read-out switch. As the ambient light changes, a leakage current of the thin film transistor is changed accordingly, and the transmission time which required by the potential change is therefore changed. The read-out switch transmits said potential to a data read-out line in order to calculate the intensity of the ambient light from the transmission time. The LCD of this invention includes a plurality of capacitors, a plurality of read-out switches and a processing module.
Controlling the Carrier-Envelope Phase of Raman-Generated Periodic Waveforms
(2009-05-29)
Hsieh, Zhi-Ming
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Lai, Chien-Jen
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Chan, Han-Sung
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Wu, Sih-Ying
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Lee, Chao-Kuei
We demonstrate control of the carrier-envelope phase of ultrashort periodic waveforms that are synthesized from a Raman-generated optical frequency comb. We generated the comb by adiabatically driving a molecular vibrational coherence with a beam at a fundamental frequency plus its second harmonic. Heterodyne measurements show that full interpulse phase locking of the comb components is realized. The results set the stage for the synthesis of periodic arbitrary waveforms in the femtosecond and subfemtosecond regimes with full control.
Nonequilibrium Transport at a Dissipative Quantum Phase Transition
(2009-05-29)
Chung, Chung-Hou
;
Le Hur, Karyn
;
Vojta, Matthias
;
Woelfle, Peter
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電子物理學系
We investigate the nonequilibrium transport near a quantum phase transition in a generic and relatively simple model, the dissipative resonant level model, that has many applications for nanosystems. We formulate a rigorous mapping and apply a controlled frequency-dependent renormalization group approach to compute the nonequilibrium current in the presence of a finite bias voltage V and a finite temperature T. For V -> 0, we find that the conductance has its well-known equilibrium form, while it displays a distinct nonequilibrium profile at finite voltage.
Optimizing operating parameters of a honeycomb zeolite rotor concentrator for processing TFT-LCD volatile organic compounds with competitive adsorption characteristics
(2009-05-30)
Lin, Yu-Chih
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Chang, Feng-Tang
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工學院
;
College of Engineering
In this study, we attempted to enhance the removal efficiency of a honeycomb zeolite rotor concentrator (HZRC), operated at optimal parameters, for processing TFT-LCD volatile organic compounds (VCCs) with competitive adsorption characteristics. The results indicated that when the HZRC processed a VOCs stream of mixed compounds, compounds with a high boiling point take precedence in the adsorption process. In addition, existing compounds with a low boiling point adsorbed onto the HZRC were also displaced by the high-boiling-point compounds. In order to achieve optimal operating parameters for high VCCs removal efficiency, results suggested controlling the inlet velocity to <1.5 m/s, reducing the concentration ratio to 8 times, increasing the desorption temperature to 200-225 degrees C, and setting the rotation speed to 6.5 rpm. (C) 2008 Elsevier B.V. All rights reserved.
Anaerobic biotransformation of fluorene and phenanthrene by sulfate-reducing bacteria and identification of biotransformation pathway
(2009-05-30)
Tsai, Jen-Chieh
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Kumar, Mathava
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Lin, Jih-Gaw
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環境工程研究所
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Institute of Environmental Engineering
In the present study, anaerobic biotransformation of fluorene and phenanthrene by sulfate-reducing bacteria (SRB) was investigated and biotransformation pathways were proposed. SRB was enriched from anaerobic swine wastewater sludge and its abundance was determined by the fluorescence in situ hybridization (FISH) technique. Batch anaerobic biotransformation studies were conducted with fluorene (5 mg L(-1)), phenanthrene (5 mg L(-1)) and a mixture of the two (10 mg L(-1)). After 21 d of incubation. 88% of fluorene and 65% of phenanthrene were biotransformed by SRB. In contrast to previous studies, a decrease in biotransformation efficiency was observed in the presence of both fluorene and phenanthrene. Throughout the study, sulfate reduction was coupled with biotransformation of fluorene and phenanthrene. However, no increase in bacterial cell density was observed in the presence of an inhibitor, i.e. molybdate. Identification of metabolites by gas chromatography-mass spectrometry (GC-MS) revealed that fluorene and phenanthrene were biotransformed through a sequence of hydration and hydrolysis reactions followed by decarboxylation with the formation of p-cresol (only in the phenanthrene system) and phenol. The metabolites identified suggest novel biotransformation pathways of fluorene and phenenthrene. (C) 2008 Elsevier B.V. All rights reserved.
北京奧運到台灣精采絕倫
(2009-05-31)
郭大齊
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Department of Communication and Technology
;
傳播與科技學系
由兩岸奧會所合辦的「體操奧運金牌選手大匯演」，分別於本月25、27與29號在北桃苗等縣市進行表演。本次活動齊集2008年北京奧運中大放異采的中國體操隊金牌選手，包含競技體操男子團體、個人全能、自由體操、雙槓、鞍馬、吊環、單槓、女子團體、個人高低槓以及蹦床男女組，其中許多隊員如李小鵬、程菲、鄒凱和楊威等在大陸早已家喻戶曉，他們出色且接近完美的表現，使得各項表演活動精彩萬分，更處處展現出體操選手追求完美的決心與毅力。
男生女生選邊站
(2009-05-31)
徐苾芬
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Department of Communication and Technology
;
傳播與科技學系
兩性議題一直令人頭痛，也是大家一直有爭議的飯後話題，然而現在口口聲聲說兩性近乎平等，生活之中卻也出現不少規範讓你／妳因為自己的性別而有不同的選擇，也因為這些規範，許多跨性別的人常常不知所措，於是，什麼情況下你會選邊站呢？也許，從你小時候，就已經有許多性別需知要默背在心了。
Location estimation for indoor autonomous vehicle navigation by omni-directional vision using circular landmarks on ceilings
(2009-05-31)
Wu, Chih-Jen
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Tsai, Wen-Hsiang
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資訊工程學系
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Department of Computer Science
A novel approach to location estimation by omni-directional vision for autonomous vehicle navigation in indoor environments using circular landmark information is proposed. A circular-shaped landmark is attached on a ceiling and an omni-directional camera is equipped on a vehicle to take upward-looking omni-directional images of the landmark. This way of image taking reduces possible landmark shape occlusion and image noise creation, which come from the existence of nearby objects or humans surrounding the vehicle. It is shown that the perspective shape of the circular landmark in the omnidirectional image may be approximated by an ellipse by analytic formulas with good shape-fitting effect and fast computation speed. The parameters of the ellipse are then used for estimating the location of the vehicle with good precision for navigation guidance. Both simulated and real images were tested and good experimental results confirm the feasibility of the proposed approach. (c) 2008 Elsevier B.V. All rights reserved.
科幻經典《星際爭霸戰》
(2009-05-31)
楊雅筑
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Department of Communication and Technology
;
傳播與科技學系
Star Trek（星艦迷航）系列第十一部電影—《星際爭霸戰》，在星艦迷眾所矚目下粉墨豋場。導演JJ亞伯拉罕將時空拉回星際戰艦企業號進行處女航之前，並用全新的電腦特效和拍攝手法，為六○年代在電視上播映的Star Trek影集，打造成全新的感受，並成功地把初步接觸Star Trek的觀眾一同拉近星艦世界。
就是「周星馳」
(2009-05-31)
鄭秀芳
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Department of Communication and Technology
;
傳播與科技學系
每當人們提到喜劇電影都會想到「星爺」周星馳，這位人物在他所主演的每一齣電影，台詞常常成為年輕人的流行用語，甚至形成一種獨特的「周星馳現象」，引起人們的討論。
我在這邊唱　夢想啟航
(2009-05-31)
葉曉昀
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Department of Communication and Technology
;
傳播與科技學系
《我在這邊唱》由圖騰樂團主唱姜聖民Suming飾演一位樂觀的阿美族青年，到城市工作，以期望有天能實現他歌唱的夢想；而周幼婷飾演一位喜愛跳舞，卻因傷受挫的失志女孩。兩位主角各自懷著夢想在大城市中相遇......
端午節　划龍舟
(2009-05-31)
林麗珊
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Department of Communication and Technology
;
傳播與科技學系
新竹市的龍舟比賽，於端午節當天在南寮漁港熱鬧開幕。交大僑生與外籍生也組成了隊伍，參加這場充滿民族風味的划龍舟大賽，為求學過程中，在異鄉地留下了特別的回憶。