Browsing by Issue Date, starting with "2010-05-20"

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PORPHYRIN-BASED PHOTOSENSITIZER DYES FOR DYE-SENSITIZED SOLAR CELLS
(2010-05-20)
YEH, CHEN-YU
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DIAU, ERIC WEI-GUANG
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LEE, CHENG-WEI
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LU, HSUEH-PEI
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LAN, CHI-MING
This invention relates to photosensitizer dyes for dye-sensitized solar cells. The photosensitizer dyes are porphyrin-based zinc complexes represented by the following general formulae (100) and (200).wherein A is represented by one of the following formulae (111)˜(118),wherein Z1˜Z10 independently represent a hydrogen atom (H), lithium (Li), sodium (Na), or tetra-alkyl ammonium group (as represented by the following general formula (120)),wherein X1˜X4 independently represent CmH2m+1 (m=1˜6), and B, C, D, and E independently represent one of the following formulae (131)˜(140),wherein Ra˜Rz are independently selected from the group consisting of H, CmH2m+1 (m=1˜15), OCpH2p+1 (p=1˜15), CH2[OC2H4]nOCH3 (n=1˜30), and [OC2H4]qOCH3 (q=1˜30).
Advances in the growth and characterization of magnetic, ferroelectric, and multiferroic oxide thin films
(2010-05-20)
Martin, L. W.
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Chu, Y-H.
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Ramesh, R.
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材料科學與工程學系
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Department of Materials Science and Engineering
The growth and characterization of functional oxide thin films that are ferroelectric, magnetic, or both at the same time are reviewed. The evolution of synthesis techniques and how advances in in situ characterization have enabled significant acceleration in improvements to these materials are described. Methods for enhancing the properties of functional materials or creating entirely new functionality at interfaces are covered, including strain engineering and layering control at the atomic-layer level. Emerging applications of these functional oxides such as achieving electrical control of ferromagnetism and the future of these complex functional oxides is discussed. (C) 2010 Elsevier B.V. All rights reserved.
Correlation between Exciton Lifetime Distribution and Morphology of Bulk Heterojunction Films after Solvent Annealing
(2010-05-20)
Huang, Jen-Hsien
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Li, Kuang-Chieh
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Chien, Fan-Ching
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Hsiao, Yu-Sheng
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Kekuda, Dhananjay
We have synthesized a low-bandgap polymer, bithiazole-based polymer (PCPDTTBT) containing cyclopentadithiophene and thiophene units, and studied its opticophysical properties and morphologies in bulk heterojunction films after annealing. We used confocal optical microscopy in conjunction with a fluorescence module to record exciton lifetime images within photoactive layers of PCPDTTBT and [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM). These images, which were consistent with those recorded using atomic force microscopy and transmission electron microscopy, revealed that phase separation of PCPDTTBT and PCBM occurred during slow solvent evaporation. This phase separation not only provided bicontinuous pathways for carrier transport to the respective electrodes hut also enhanced the degree of polymer chain stacking, thereby improving the absorption and balancing the electron and hole mobilities. We tested the performance of solar cells incorporating PCPDTTBT and various fullerene derivatives. Under AM 1.5 G illumination (100 mW cm(-2)), a PCPDTTBT/bisPCBM-based solar cell exhibited a power conversion efficiency of 3.8%, with a short circuit current of 7.3 mA cm(-2), an open circuit voltage of 0.88 V, and a fill factor of 59.1%.
Growth of ZnO Nanostructures with Controllable Morphology Using a Facile Green Antisolvent Method
(2010-05-20)
Dong, Ji-Yao
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Hsu, Yung-Jung
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Wong, David Shan-Hill
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Lu, Shih-Yuan
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材料科學與工程學系
An environmentally friendly antisolvent approach, which involves only biocompatible chemicals and mild processing conditions, was developed to prepare various ZnO nanostructures including twin-cones and nanorods with controllable dimensions, The method was based on the dissolution of ZnO powders in a deep eutectic solvent (DES), followed by precipitation of ZnO nanostructures from the DES upon introduction of an antisolvent. It is the first example of the room temperature ionic liquid based antisolvent process for preparation of nanomaterials. Through suitably modulating the processing conditions, such as the ethanol content of the antisolvent and the injection time of the ZnO-containing DES, the morphology of the resulting ZnO nanostructures can be readily controlled. Anisotropic crystal growth was achieved without severe reaction conditions, such as high temperatures and high vacuums, or use of environmentally harmful chemicals, such as long carbon chain surfactants and capping reagents. The present method can be readily extended to produce versatile nanostructures of other functional materials.
Adjustable implant electrode system and implant electrode assembly thereof
(2010-05-20)
Choi, Charles Tak-Ming
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Hsu, Chien-Hua
An adjustable implant electrode system comprises an adjustable implant electrode assembly and an adjustment device for adjusting the adjustable implant electrode assembly to a desired position. The adjustable implant electrode assembly comprises an implant, a plurality of electrodes, and a plurality of magnetic components. The electrodes are disposed in the implant for providing stimulating currents according to a control signal. The magnetic components are combined with the electrodes in one-to-one correspondence. The adjustment device comprises a control unit, an excitation unit, and one or more magnetic units. The control unit is used to select one or more magnetic components to be moved from the magnetic components, and the excitation unit is used to excite the selected one or more magnetic components for the same to generate a magnetic pole, and the magnetic unit is adapted to generate a magnetic filed to drive the magnetic pole and accordingly move the implant.
交大e-News第071期
(2010-05-20)
Secretariat
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國立交通大學秘書室
Electric-Field-Induced Enhancement/Quenching of Photoluminescence of pi-Conjugated Polymer S3-PPV: Excitation Energy Dependence
(2010-05-20)
Mehata, Mohan Singh
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Hsu, Chain-Shu
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Lee, Yuan-Pern
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Ohta, Nobuhiro
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應用化學系
The effects of electric field on absorption and photoluminescence (PL) of films of sulfide-substituted PPV derivative S3-PPV, poly[2-(phenyl)-3-(4'-(3,7-dimethyloctyloxy)phenyl)-1,4-phenylenevinylene-co-2-(11'-decyl sulfanylundecanyloxy)-5-methoxy-1,4-phenylene vinylene], were investigated. Electroabsorption (E-A) and electrophotoluminescence (E-PL) responses of S3-PPV show the Stark shifts, indicating a significant alternation in the molecular polarizability (Delta(alpha) over bar) associated with the optical transitions. Field-induced enhancement or quenching is also observed for PL of S3-PPV, depending on the photoexcitation energy, whereas the shape of the PL spectra is independent of the excitation wavelength. The field effects on the decay profiles of PL indicate that the quenching results from a diminished population of the emitting states on excitation at 300 nm, whereas the PL is enhanced on excitation at 471 nm because the emitting state has an increased lifetime. The efficiency of field-assisted generation of electron-hole pairs produced through excitons monotonically increases with increasing excitation energy, and the nonradiative decay rate in the emitting state is diminished by electric fields in S3-PPV. The photoirradiation of S3-PPV in ambient air resulted in rapid degradation of the polymer film.
CIRCUIT AND METHOD FOR IMPLEMENTING FREQUENCY TRIPLED I/Q SIGNALS
(2010-05-20)
Kuo, Chien-Nan
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Chen, Huan-Sheng
A circuit and a method for implementing frequency tripled I/Q signals are proposed, including receiving two input I/Q signals through frequency multipliers so as to generate two frequency multiplied signals and mixing the input I/Q signals and the corresponding frequency multiplied signals through mixers for generating and outputting two I/Q signals with a frequency three times that of the input I/Q signals. The invention eliminates the requirement for high amplitude of the input signals as in the prior art and has lower power consumption and broader bandwidth and can be used as high frequency signal sources in any single chip processes.
Multistep Microwave-Assisted Divergent Synthesis of Indolo-Fused Pyrazino-/Diazepinoquinoxalinones on PEG Support
(2010-05-21)
Lai, Jin-Ji
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Salunke, Deepak B.
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Sun, Chung-Ming
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應用化學系
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Department of Applied Chemistry
Synthesis of amino acid and indoline-substituted dinitrobenzene on a soluble polymer support (PEG) and its further reductive double-ring closure to afford structurally diverse indolo-fused pyrazino-/diazepinoquinoxalinones is described. Traceless synthesis of quinoxalinones coupled with application of the Pictet-Spengler-type condensation reaction furnished these novel scaffolds. These hitherto novel heterocycles are synthesized in shorter times under microwave irradiation conditions in comparison with that of classical reaction conditions.
Tunneling Effects on Fine-Structure Splitting in Quantum-Dot Molecules
(2010-05-21)
Ramirez, Hanz Y.
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Cheng, Shun-Jen
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電子物理學系
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Department of Electrophysics
We theoretically study the effects of bias-controlled interdot tunneling in vertically coupled quantum dots on the emission properties of spin excitons in various bias-controlled tunneling regimes. As a main result, we predict substantial reduction of optical fine-structure splitting without any drop in the optical oscillator strength for the coupled dots with high tunneling rates. This special reduction diminishes the distinguishability of polarized decay paths in cascade emission processes suggesting the use of stacked quantum-dot molecules as entangled photon-pair sources.
Direct Observation of Electron Dephasing due to Inelastic Scattering from Defects in Weakly Disordered AuPd Wires
(2010-05-21)
Zhong, Yuan-Liang
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Sergeev, Andrei
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Chen, Chii-Dong
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Lin, Juhn-Jong
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電子物理學系
To identify and investigate the mechanisms of electron-phonon (e-ph) relaxation in weakly disordered metallic conductors, we measure the electron dephasing rate in a series of suspended and supported 15-nm thick AuPd wires. In a wide temperature range, from similar to 8 K to above 20 K, the e-ph interaction dominates in the dephasing processes. The corresponding relaxation rate reveals a quadratic temperature dependence, tau(-1)(e-ph) = A(ep)T(2), where A(ep) approximate to 5 x 10(9) K(-2) s(-1) is essentially the same for all samples studied. Our observations are shown to be in good agreement with the theory which predicts that, even in weakly disordered metallic structures at moderately low temperatures, the major mechanism of the e-ph relaxation is the electron scattering from vibrating defects and impurities.
泛用行動通訊系統中系統間交遞之容量為主之壓縮模式的控制方法
(2010-05-21)
黃經堯
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張正達
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何玠原
第三代手機系統的重要特色之一為系統間交遞，具有可變傳輸間隙及可變位準之壓縮模式，以正規化地支援系統間及頻率間之交遞，為了將系統之使用資源最小化，當須維持邊界單元的交遞品質時，可採用本發明之容量為主之壓縮模式的控制方法，而在容量與通訊品質互相牽制的考量下，本發明之控制方法在基於容量之潛在影響及壓縮模式量測之成效，可適應性地管理壓縮模式之操作，本發明可增加壓縮模式之操作的成效及表現。 The Inter-System handover is one of the key features in the third generation cellular systems. The compressed mode, with variable transmission gaps and power levels, is standardized to support the inter-freguencyl system handover. To minimize the use of system resources while maintaining the border-cell handover quality, a capacity-based compressed mode control method of the present inventionois proposed. Considering the tradeoff between the capacity and the communication quality, the control method can adaptively manage the compressed mode operation based on the pontential impacts on the capacity and the effectiveness of the compressed mode measurement. The present invention will improve the effectiveness and performance of the compressed mode operation. 【創作特點】本發明之目的在於提供一種以容量為主之壓縮模式的控制方法，其可用在泛用行動通訊系統中之系統間交遞，具有降低功率消耗、提升系統表現、及保持系統容量等優點。根據本發明目的而提出之一種以容量為主之壓縮模式的控制方法，其用在泛用行動通訊系統中用於系統間交遞，係包含以下步驟：(1)首先，依據一射頻狀況、一收訊強度指示器(Received Signal Strength Indicator，RSSI)所量測之數目、及一避免連續懸擱值來決定各個使用者之優先序；(2)接著，依據各個使用者之優先序來決定使用者是否執行一壓縮模式或懸擱該壓縮模式。依照本發明的較佳實施例，進一步包含(3)使用一臨界功率值來限制泛用行動通訊系統(UMTS)之功率位準，當一估計之傳輸速率超過此臨界功率時，則依據各使用者之優先序來懸擱各個該使用者之壓縮模式。本發明由於採用以使用者之優先序來決定是否執行壓縮模式之結構，因此可保持系統容量、降低功率消耗、及提升系統表現。
中性潮流新時尚
(2010-05-23)
林詩雯
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Department of Communication and Technology
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傳播與科技學系
中性風格女性不再默默噤聲，而是利用其所能帶來的影響力，展示特有的生命力。自信、獨立、強悍的風格漸漸成為可選擇的項目，不會讓高跟鞋、迷你裙專屬於前，並且，有朝氣的穿著也能獲得婆婆媽媽們的喜愛與認同。
操人特攻隊勤勞的妥瑞兒
(2010-05-23)
宋宜玲
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Department of Communication and Technology
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傳播與科技學系
「只有在自己小孩出現妥瑞症狀時，才深刻明白什麼是妥瑞症。」台中李媽媽的六歲女兒，在幾個禮拜前出現不定期用膝蓋撞桌子、擠眉弄眼、擰手等妥瑞症症狀，面對突如其來的噩耗，即使李媽媽盡力說服自己「妥瑞不是病」，但每每看見女兒無法控制妥瑞症的發作時，心中的焦慮與無力感，至今仍令她無法釋懷。
新一代的設計夢
(2010-05-23)
林忻
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Department of Communication and Technology
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傳播與科技學系
新一代設計展是台灣具有指標性且規模最大的學生設計展，每年都匯聚了全台各個設計相關科系的精華創作，為這些設計新鮮人提供一個發表作品的平台。
文化創意人改變我們的故事
(2010-05-23)
林穎瑄
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Department of Communication and Technology
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傳播與科技學系
半個世紀以來，隨著生活水準的提高，大家追求的早已不再是物質與生活的享受，而是提倡要用心地生活，寫出一篇篇迷人的故事。......
大小螢幕感官刺激大不同
(2010-05-23)
陳明鈺
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Department of Communication and Technology
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傳播與科技學系
推理懸疑類型的電影，氣氛營造是其中很大的重點；而電視影集在此方面，卻不一定以驚悚手法表現，而是透過不同於電影的敘事方法，呈現完全不同的感覺。兩相比較之下，你比較喜歡哪一種呢？
少年學苑中輟生的返航燈塔
(2010-05-23)
鄭琬馨
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Department of Communication and Technology
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傳播與科技學系
少年常需要經歷叛逆時期，許多外界因素都會影響他們，若是此時父母、老師沒有給予適時地協助，就容易讓這些孩子走上偏差的路。中輟生，很多都是在這種情況下產生。離開校園的中輟生，可能必須就業，或是向外尋求認同，造成更多社會問題。中華好家庭關懷協會注意到這一點，民國98年設置少年學苑，由台中縣教育處轉介中輟生到該機構安置。
韓文正夯　校園也颳韓風
(2010-05-23)
陳怡
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Department of Communication and Technology
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傳播與科技學系
韓流席捲席捲整個亞洲，韓文風潮跟著吹進校園，國立交通大學即於九十八學年度下學期起開設韓文課程，提供同學做為第二外語的修習選擇。
環境和觀光兩平衡　司馬庫斯部落
(2010-05-23)
吳奕樺
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Department of Communication and Technology
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傳播與科技學系
司馬庫斯的生態旅遊，是目前部落的經濟收入主要來源。當地在每個週末和特定假日時，經常擠滿了觀光客，但是地方居民卻能夠達到共識，讓地方的經濟和生態取得平衡。