Browsing by Issue Date, starting with "2012-12-14"

Now showing 1 - 20 of 34682

Orthorhombic BiFeO3
(2012-12-14)
Yang, J. C.
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He, Q.
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Suresha, S. J.
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Kuo, C. Y.
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Peng, C. Y.
A new orthorhombic phase of the multiferroic BiFeO3 has been created via strain engineering by growing it on a NdScO3(110)(o) substrate. The tensile-strained orthorhombic BiFeO3 phase is ferroelectric and antiferromagnetic at room temperature. A combination of nonlinear optical second harmonic generation and piezoresponse force microscopy revealed that the ferroelectric polarization in the orthorhombic phase is along the in-plane < 110 >(pc) directions. In addition, the corresponding rotation of the antiferromagnetic axis in this new phase was observed using x-ray linear dichroism. DOI: 10.1103/PhysRevLett.109.247606
Enhanced photocatalytic decomposition of methylene blue by the heterostructure of PdO nanoflakes and TiO2 nanoparticles
(2012-12-15)
Huang, Chien-Jung
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Pan, Fu-Ming
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Chang, I-Chun
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材料科學與工程學系
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Department of Materials Science and Engineering
We prepared PdO nanoflakes by reactive sputter deposition to form a heterostructure with TiO2 nanoparticles on the SiO2 substrate for the study of photocatalytic decomposition of methylene blue (MB) molecules. Although the PdO nanoflake has little photocatalytic activity toward MB decomposition, the PdO/TiO2 heterostructure has a photocatalytic activity toward MB decomposition under UV light illumination as large as twice that of bare TiO2 nanoparticles. The enhancement in the photocatalytic activity is ascribed to the fast photogenerated carrier separation resulting from the potential barrier formed at the heterojunction between the two oxide semiconductors. Although PdO nanoflakes can be photoexcited under visible light illumination, the PdO/TiO2 heterostructure exhibits little photocatalytic activity toward the MB decomposition. (C) 2012 Elsevier B. V. All rights reserved.
Improvement of Epitaxy GaN Quality Using Liquid-Phase Deposited Nano-Patterned Sapphire Substrates
(2012-12-15)
Hsieh, Cheng-Yu
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Lin, Bo-Wen
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Cho, Hsin-Ju
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Wang, Bau-Ming
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Chang, Nancy
A relatively simple and easy and inexpensive liquid-phase deposition (LPD) method is employed to introduce nanoscale silica hemispheres on sapphire substrates for fabricating a nano-patterned sapphire substrate (NPSS). Compared with GaN grown on sapphire without any pattern, the NPSS-GaN film is of much better quality as observed by scanning electron microscopy, transmission electron-microscopy, X-ray diffraction, cathodoluminescence, and photoluminescence. This is because GaN is initiated from the c-plane instead of the LPD-silica surface. In addition, many dislocations within the NPSS-GaN bend toward the patterns, or end at the GaN/void interfaces.
Porphyrin-diindenothieno[2,3-b]thiophene alternating copolymerua blue-light harvester in ternary-blend polymer solar cells
(2012-12-15)
Wu, Yu-Chun
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Chao, Yi-Hsiang
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Wang, Chien-Lung
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Wu, Chun-Ta
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Hsu, Chain-Shu
Porphyrin, despite chosen by Nature as light harvesting units, hasn't revealed its full potentials as a structural unit in porphyrin-incorporated polymers (PPors). A novel PPor was synthesized to investigate the origins of the low performances of PPor-based polymer solar cells (PSCs). The polymer features broad absorption in the blue-light region, because the diindenothieno[2,3-b]thiophene (DITT) unit extended the conjugation in the polymer backbone. PPor-DITT/PC71BM based PSCs have a high Voc (0.79 V). Their low Jsc and fill factor (FF) were attributed to the un-optimized morphology, as indicated by the photoluminescence quenching and atomic force microscopy (AFM) experiments. Using PPor-DITT as a blue-light harvesting dopant in an amorphous host leverage the strong 400550 nm absorption of PPor-DITT and circumvent the difficulties in reaching optimized morphology in the PPor/PCBM thin films. An addition of 2 wt % of PPor-DITT in ternary-blend PSCs resulted in a 10 % increase of external quantum efficiency (EQE) in the blue-light region. However, in a crystalline host, the dopant decreased the crystallinity of the host and led to large drops in FF and power conversion efficiencies (PCEs). The study provides an alternative route and expands the application of PPors in PSCs as a blue-light harvester in ternary-blend PSCs using amorphous polymers as host. (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
Synthesis of novel dithienothiophene- and 2,7-carbazole-based conjugated polymers and H-bonded effects on electrochromic and photovoltaic properties
(2012-12-15)
Fang, Hsiao-Ping
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Lin, Jia-Wei
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Chiang, I-Hung
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Chu, Chih-Wei
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Wei, Kung-Hwa
Three kinds of dithienothiophene/carbazole-based conjugated polymers (P1P3), which bear acid-protected and benzoic acid pendants in P2 and P3, respectively, were synthesized via Suzuki coupling reaction. Interestingly, P1P3 exhibited reversible electrochromism during the oxidation processes of cyclic voltammogram studies, and P3 (with H-bonds) revealed the best electrochromic property with the most noticeable color change. According to powder X-ray diffraction (XRD) analysis, these polymers exhibited obvious diffraction features indicating bilayered packings between polymer backbones and p-p stacking between layers in the solid state. Compared with the XRD data of P2 (without H-bands), H-bonds of P3 induced a higher crystallinity in the small-angle region (corresponding to a higher ordered bilayered packings between polymer backbones), but with a similar crystallinity in the wide angle region indicating a comparable p-p stacking distance between layers. Moreover, based on the preliminary photovoltaic properties of PSC devices (P1P3 blended individually with PCBM acceptor in the weight ratio of 1:1), P3 (with H-bonds) possessed the highest power conversion efficiency of 0.61% (with Jsc = 2.26 mA/cm2, FF = 29.8%, and Voc = 0.9 V). In contrast to P2 (without H-bands), the thermal stability, crystallinity, and electrochromic along with photovoltaic properties of P3 were generally enhanced due to its H-bonded effects. (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
Direct-detection polarization division multiplexed orthogonal frequency-division multiplexing transmission systems without polarization tracking
(2012-12-15)
Wang, Chih-Yun
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Wei, Chia-Chien
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Lin, Chun-Ting
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Chi, Sien
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光電系統研究所
We experimentally demonstrate a direct-detection polarization division multiplexed (PDM) orthogonal frequency-division multiplexing (OFDM) scheme without dynamic polarization tracking. Simply using a polarization-diverse receiver, the proposed multiple-input multiple-output assisted system can achieve bit-error rate of 10(-3) over all possible received states of polarization. Moreover, 50 Gbps PDM-OFDM transmission over 100 km single-mode fiber is successfully demonstrated without dispersion-induced penalty. (C) 2012 Optical Society of America
A transition of three to two dimensional Si growth on Ge (100) substrate
(2012-12-15)
Tu, W. -H.
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Lee, C. -H.
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Chang, H. T.
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Lin, B. -H.
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Hsu, C. -H.
For the initial growth of Si on Ge, three-dimensional Si quantum dots grown on the Ge surface were observed. With increasing Si thickness, the Si growth changes from three-dimensional to two-dimensional growth mode and the dots disappear gradually. Finally, the surface is smooth with the roughness of 0.26 nm, similar to the original Ge substrate, when 15 nm Si is deposited. More Ge segregation on the wetting layer leads to more open sites to increase the subsequent Si growth rate on the wetting layer than on the Si dots. The in-plane x-ray diffraction by synchrotron radiation is used to observe the evolution of tensile strain in the Si layer grown on Ge (100) substrate. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770408]
Concentrating Photovoltaic System Using a Liquid Crystal Lens
(2012-12-15)
Tsou, Yu-Shih
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Lin, Yi-Hsin
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Wei, An-Chi
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光電工程學系
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Department of Photonics
A concentrating photovoltaic (CPV) system with a steady electric output adopting an electrically tunable concentration ratio of the liquid crystals (LC) lens is demonstrated. The distribution of the LC directors of the LC lens can be controlled by an applied voltage in order to adjust the number of incident photons in an area. As a result, the CPV system adopting an LC lens can be operated with a static and maximum output power density under different ambient illuminations because the LC lens with an electrically tunable concentration ratio helps to increase the photocurrent at a low illumination and prevent the effect of the series resistance at a high illumination. The detailed operating principles are discussed, and the experimental results are performed. We believe this letter can help enhance the output power density of CPV systems by using active optical elements whose concentration ratio is tunable.
張芷瑄　當身體是創作武器
(2012-12-16)
王柔婷
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Department of Communication and Technology
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傳播與科技學系
剛畢業於實踐大學服裝設計系的張芷瑄，從外表看來，文靜內向，從她身旁走過，還以為只是個平凡的女學生，很難想像隱藏在文靜表象下的她，會選擇用那麼前衛的方式創作：透過裸體、剃髮為自己的內心發聲。
世界末日　人心惶惶
(2012-12-16)
廖敏廷
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Department of Communication and Technology
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傳播與科技學系
馬雅文明預言：「當地球轉換天文週期時，將進入動亂期。」以世界末日為主題的電影《2012》的上映，與出土的馬雅末日預言結合，造成社會上許多人，對於末日將在2012年來臨感到惶恐不安。
藍衫新風貌　藍染魔法DIY
(2012-12-16)
戴子昀
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Department of Communication and Technology
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傳播與科技學系
2012年「秋客染新衫」特展在竹北新瓦屋舉行，今年主題「藝起柿柿看」，展出多項植物染藝品，每個週末尚有不同的主題活動供民眾報名參加。12月8日為「藍染」體驗活動，吸引許多父母帶著小朋友一同來體驗染布的樂趣。
聆聽　那屬於刺客們的跫音
(2012-12-16)
楊敦元
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Department of Communication and Technology
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傳播與科技學系
一部好的電影，必然有好的音樂作為襯托；一款優秀的遊戲也是如此。《刺客教條》系列作自2007年出品後，便風靡全球，讓我們一起來看看這款遊戲的音樂究竟如何引人入勝？
客家新嘗試　染藝時裝秀
(2012-12-16)
王紹容
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Department of Communication and Technology
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傳播與科技學系
新竹縣政府文化局在12月15日下午，在新瓦屋廣場舉辦了「一起來染布染藝發表體驗會」。現場有染藝服飾走秀、染藝DIY體驗和創意市集等，讓民眾在觀賞及參與的過程中體驗客家染飾文化之美。
Come On Baby歌奏生命芳香
(2012-12-16)
姚映竹
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Department of Communication and Technology
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傳播與科技學系
來吧！焙焙！這對由兄妹組成的搭檔，用豐富的樂器演奏加上誠懇真摯的歌聲，唱出每個人心底對生命、對自由、對情感的共鳴。在繁重的生活之間，帶來了一絲花草式民謠的芬芳。
悠游水墨　邱炳亮
(2012-12-16)
龔霈鏵
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Department of Communication and Technology
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傳播與科技學系
「我的人生起起伏伏非常的精彩，凡是聽過的人，都視我為一個傳奇性的人物。」多樣的職位更迭，邱炳亮名字上的頭銜雖然一再改變，唯一不變的是一顆從小就冒險犯難的心。
熱分析模型建立方法及其非暫時性電腦可讀取紀錄媒體
(2012-12-16)
陳健章
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鄭裕庭
一種熱分析模型建立方法及其非暫時性電腦可讀取紀錄媒體。熱分析模型建立方法包含下列步驟:根據電子系統所包含之電子模組建立電熱��網路模型,以定義電子系統之熱源、熱傳遞路徑以及共基恆溫散熱面。定義電子系統中之觀察點,各位於相對參考點之外圍空間之等溫表面上,其中參考點為熱源或觀察點其中之一。根據參考點至各觀察點之熱功率密度函數、熱導係數及距離向量,計算熱傳導溫度差或熱對流溫度差。根據共基恆溫散熱面之定義溫度,由熱傳導溫度差或熱對流溫度差建立電子系統之溫度分佈。
類比型畫素儲存電路
(2012-12-16)
劉柏村
;
竹立煒
;
鄭光廷
本發明係提供一種類比型畫素儲存電路,係適用於一低溫多晶矽液晶顯示器,該類比型畫素儲存電路包含第一電晶體、第二電晶體、第三電晶體、第四電晶體、第五電晶體、第六電晶體、第七電晶體、以及第一電容。類比型畫素儲存電路係具有複數個操作週期,於操作週期中第一電晶體、第二電晶體、第三電晶體、第四電晶體、第五電晶體、第六電晶體以及第七電晶體係根據第一掃描信號、第二掃描信號、以及第三掃描信號之控制,以相對於輸出端輸出輸出信號。
老派約會之心碎少女　
(2012-12-16)
王宗瑜
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Department of Communication and Technology
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傳播與科技學系
看見書名勾起了偉士牌機車、燭光晚餐以及雨中漫步等含蓄畫面，而以滿心的盼望，期待書中再現老派約會的浪漫的少女心們，可能面臨碎裂。「一個意義上，李維菁寫的，正是『老派愛情的終極輓歌』。」
堅持自己的理念　徐正麟
(2012-12-16)
陳儀澧
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Department of Communication and Technology
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傳播與科技學系
徐正麟對於服務品質的要求與堅持、具有特色的個人風格與服務時的種種溫馨關懷，都是讓所有消費者耳目一新，眼睛為之一亮的特點。其中從小到大的工作經歷、生活背景等各種因素都深深影響著他的人物性格和價值觀。
適用於銅製程的半導體裝置
(2012-12-16)
張翼
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張嘉華
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林岳欽
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陳宥綱
;
謝廷恩
一種適用於銅製程的半導體裝置,包含本體,及至少一電極結構,本體以氮化鎵系半導體為主要材料所構成;電極結構與外部電路電連接並包括形成於本體上並與本體歐姆接觸的歐姆接觸層、形成於歐姆接觸層上的抑制層,及形成於抑制層上且以銅為主成分的導線層,歐姆接觸層以選自鈦、鋁、鎳,及至少包含此等元素其中之一所成的合金為材料所構成,抑制層以選自鈦、鎢、氮,及其中之至少一為主成分構成的材料所構成;本發明以歐姆接觸層及抑制層搭配本體以阻擋導線層中的銅擴散進入本體中,而維持半導體裝置穩定的電特性及可靠度。