Browsing by Issue Date, starting with "2011-03-21"

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Stability of the anisotropically inflating Bianchi type VI expanding solutions
(2011-03-21)
Kao, W. F.
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Lin, Ing-Chen
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物理研究所
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Institute of Physics
A special class of the Bianchi type VI expanding solutions was speculated to break the cosmic no-hair theorem that will not approach the late-time de Sitter solution. We will show that an unstable mode always exists when the perturbation of the field equations is applied to the system. In addition to a model-independent perturbation formula, a simplification is also achieved by the introduction of a delta R = 0 solution good for quadratic models in all Bianchi spaces. The result shows that this special class of anisotropically expanding solutions is unstable.
Enhanced electron-hole plasma stimulated emission in optically pumped gallium nitride nanopillars
(2011-03-21)
Lo, M. -H.
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Cheng, Y. -J.
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Kuo, H. -C.
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Wang, S. -C.
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光電工程學系
An enhanced stimulated emission was observed in optically pumped GaN nanopillars. The nanopillars were fabricated from an epitaxial wafer by patterned pillar etching followed by crystalline regrowth. Under optical excitation, a strong redshifted stimulated emission peak emerged from a broad spontaneous emission background. The emission is attributed to the electron-hole plasma gain at high carrier density. The emission slope efficiency was greatly enhanced by 20 times compared with a GaN substrate under the same pumping condition. The enhancement is attributed to the better photon and gain interaction from the multiple scattering of photons among nanopillars. (C) 2011 American Institute of Physics. [doi:10.1063/1.3570634]
交大e-News第090期
(2011-03-21)
Secretariat
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國立交通大學秘書室
Induction of Cell-Cell Connections by Using in situ Laser Lithography on a Perfluoroalkyl-Coated Cultivation Platform
(2011-03-21)
Okano, Kazunori
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Yu, David
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Matsui, Ai
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Maezawa, Yasuyo
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Hosokawa, Yoichiroh
This article describes a novel laser-directed microfabrication method carried out in aqueous solution for the organization of cell networks on a platform. A femtosecond (fs) laser was applied to a platform culturing PC12, HeLa, or normal human astrocyte (NHA) cells to manipulate them and to facilitate mutual connections. By applying an fs-laser-induced impulsive force, cells were detached from their original location on the plate, and translocated onto microfabricated cell-adhesive domains that were surrounded with a cell-repellent perfluoroalkyl (R(f)) polymer. Then the fs-laser pulse-train was applied to the Rf polymer surface to modify the cell-repellent surface, and to make cell-adhesive channels of several mm in width between each cell-adhesive domain. PC12 cells elongated along the channels and made contact with others cells. HeLa and NHA cells also migrated along the channels and connected to the other cells. Surface analysis by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) confirmed that the Rf polymer was partially decomposed. The method presented here could contribute not only to the study of developing networks of neuronal, glial, and capillary cells, but also to the quantitative analysis of nerve function.
Anomalous on-current and subthreshold swing improvement in low-temperature polycrystalline-silicon thin-film transistors under Gate bias stress
(2011-03-21)
Lin, Chia-Sheng
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Chen, Ying-Chung
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Chang, Ting-Chang
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Jian, Fu-Yen
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Li, Hung-Wei
This work investigates an improvement in anomalous on-current and subthreshold swing (SS) in Low-temperature polycrystalline-silicon thin-film transistors after positive gate bias stress. The experimental results reveal that the improved electric properties are due to the hole trapping at SiO(2) above the lightly doped drain regions, which causes a strong electric field at the gate corners. The effect of the hole trapping is to reduce the effective channel length and the SS. Besides, the stress-related electric field was also simulated by TCAD software to verify the mechanism above. (C) 2011 American Institute of Physics. [doi:10.1063/1.3568895]
The effect of trimethylgallium flows in the AIInGaN barrier on optoelectronic characteristics of near ultraviolet light-emitting diodes grown by atmospheric pressure metalorganic vapor phase epitaxy
(2011-03-21)
Fu, Yi-Keng
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Jiang, Ren-Hao
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Lu, Yu-Hsuan
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Chen, Bo-Chun
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Xuan, Rong
The letter reports a theoretical and experimental study on the device performance of near ultraviolet light-emitting diodes (LEDs) with quaternary AlInGaN quantum barrier (QB). The indium mole fraction of AlInGaN QB could be enhanced as we increased the trimethylgallium flow rate. It was found the AlInGaN/InGaN LEDs can reduce forward voltage and improve light output power, compared with conventional GaN QB. By using advanced device simulation, it should be attributed to a reduction in lattice mismatch induced polarization mismatch in the active layer, which results in the suppression of electron overflow. (C) 2011 American Institute of Physics. [doi:10.1063/1.3571440]
Self-Assembled and Cross-Linked Fullerene Interlayer on Titanium Oxide for Highly Efficient Inverted Polymer Solar Cells
(2011-03-22)
Cheng, Yen-Ju
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Cao, Fong-Yi
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Lin, Wei-Cheng
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Chen, Chiu-Hsiang
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Hsieh, Chao-Hsiang
We have successfully designed and synthesized two oxetane-functionalized fullerene derivatives, [6,6]-phenyl-C(61)-butyric oxetane ester (PCBO) and [6,6]-phenyl-C(63)-butyric oxetane dendron ester (PCBOD). We demonstrated that the oxetane functionality with neutral nature can anchor onto the TiO(x) surface via cationic ring-opening reaction under thermal and UV treatment, as evidenced by contact angle measurement and X-ray photoelectron spectroscopy. The self-assembly of PCBO, functionalized with one oxetane group, on the TiO(x) surface forms an adhesive monolayer with intimate contact. Inverted bulk-heterojunction device B [ITO/TiO(x)/SA-PCBO/P3HT:PCBM (1:1 w/w)/MoO(3)/Ag, where ITO is indium tin oxide, SA is self-assembled, P3HT is poly(3-hexylthiophene), and PCBM is [6,6]-phenyl-C(61)-butyric acid methyl ester] with this self-assembled PCB (SA-PCBO) modifier showed an impressive power conversion efficiency (PCE) of 4.1%, which outperforms the reference device A (PCE = 3.6%) without this monolayer [ITO/TiO(x)/P3HT:PCBM (1:1 w/w)/MoO(3)/Ag]. This SA-PCBO modifier exerts multipositive effects on the interface, including improvement of exciton dissociation efficiency, reduction of charge recombination, decrease of the interface contact resistance, and passivation of the surface electron traps at the interface of TiO(x). Furthermore, PCBOD, containing two oxetane groups, is capable of self-assembling on the TiO(x) surface and simultaneously undergoing cross-linking, generating a dense, robust, and pinhole-free multimolecular interlayer to further strengthen the interface characteristics. Device C [ITO/TiO(x)/C-PCBOD/P3HT:PCBM(1:1, in wt%)/MoO(3)/Ag] incorporating this cross-linked PCBOD (C-PCBOD) interlayer delivered the highest PCE of 4.5% which represents 26% enhancement over device A. This simple and easy strategy smartly integrates the advantages of self-assembly and cross-linking in a single fullerene-based molecule, showing promise in producing highly efficient inverted PSCs.
Anisotropic palladium nanocrystals as promising electrocatalysts
(2011-03-27)
Hsu, Yung-Jung
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Fan, Yu-Sin
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材料科學與工程學系
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Department of Materials Science and Engineering
江湖在哪裡？
(2011-03-27)
張宇翔
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Department of Communication and Technology
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傳播與科技學系
這一切也不過是五十年前的事情而已，並不是電視上反覆重播的，受冤屈庶民攔轎下跪的滿清年代。當一車車以牛拖行駛往農會的沉重稻穀，慢慢地轉變成體重為零的電子申報納稅之前，縱橫的鄉野田間是如何的抑鬱寡歡，承受著掌權者加諸於它的責難與傷痕。《江湖在哪裡？》以作者吳音寧的出生地彰化二林作為述說歷史的基點，整理出一篇篇感性的史料，為台灣的農業發展甚至是整體的產業結構，留下一些有別於黑板上匆匆畫記的語言。
那一夜　窺見城市靈魂之美
(2011-03-27)
蔡妙鈴
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Department of Communication and Technology
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傳播與科技學系
常常住在這裡想著巴黎，翻開一頁頁的台北故事，在日光燈下對著101說我愛你；市井小民放大從巴黎鐵塔俯瞰的夜景海報，是人們一個想圓，又不及的夢。然而無須汲汲營營於他方，這裡才是家，一個迫切追逐與完成的理想和現實。
摩登大賽車
(2011-03-27)
蔡少安
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Department of Communication and Technology
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傳播與科技學系
F1 2011 賽季本周末在澳洲墨爾本正式開幕，挾著 2010 年氣勢的紅牛、去年屈居亞軍鎩羽而歸的法拉利、勢在必得的朋馳、輪胎供應商的更換、新規則 … 2011 年賽季能否和去年一樣精彩呢？
醫病之間　扶持或猜忌？
(2011-03-27)
林映綺
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Department of Communication and Technology
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傳播與科技學系
「醫學是門不完美的科學」《一位外科醫師的修煉》作者葛文德這麼說，這句話必定震撼許多人的心，人們所知的醫學是沒有犯錯空間的工作，醫生則是菁英中的菁英。嚴謹的醫學教育過後，醫生們真的不會再犯錯嗎？答案是否定的，而且錯誤不只是醫療，還有體系。
總編輯的話
(2011-03-27)
鄭家宜
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Department of Communication and Technology
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傳播與科技學系
傳科101級的第101期喀報，在大家揮灑著青春與淚水中，出爐了！本期共有二十三篇文章，每一篇文章都十分出色，而且都是各個記者們用心用肝寫出的「血汗史」。總編只能稍作介紹，更多精彩內容，就要請讀者們點進文章細細品嘗了。
墮落的醫界　貝納德的嘆息
(2011-03-27)
周亭羽
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Department of Communication and Technology
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傳播與科技學系
如果能夠挽回你的生命，我願意付出任何代價，我願意。
旅行的藝術　留下意義
(2011-03-27)
陳俐吟
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Department of Communication and Technology
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傳播與科技學系
人們渴望出走、嚮往流浪，似乎是亙古不變的事，但旅行不是觀光，也不是走馬看花，旅行該有意義、該在結束後留下些什麼，《旅行的藝術》一書，就在告訴你這些。
客家庄　觀光化了沒？
(2011-03-27)
李宜融
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Department of Communication and Technology
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傳播與科技學系
提到客家庄，你會想到什麼? 是客家的美食板條和擂茶，還是客家的大紅花布，寧靜的紅磚巷裡探出個穿著藍衫的美麗女子，還是高低起伏的丘陵地上客家山歌深情對唱? 還是，充滿人潮的觀光老街?
少女小漁電影與文學的對話
(2011-03-27)
劉芮菁
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Department of Communication and Technology
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傳播與科技學系
一般人眼中的紐約城，應是顆人文薈萃的大蘋果，但在電影《少女小漁》中，不見紙醉金迷的繁華與優渥，只有招牌林立的唐人街，成衣廠內成排的女工，大清早便在魚市場打工的華裔工讀生，以及躲避移民局的倉皇身影。
黃德榮　教畫孩子王
(2011-03-27)
周揚珊
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Department of Communication and Technology
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傳播與科技學系
黃德榮現在在新竹市北畫社擔任美術老師，對他來說畫社就像他另外一個家，從大學時期開始在畫社擔任助教，一直到現在為止，教了十幾年的畫，從未抹滅掉黃德榮對於教畫的熱忱。黃德榮笑道：「我除了教技巧，也教心，交朋友。」他與學生亦師亦友的關係，更能輔助他傳遞心中的想法。
當我開始習慣這裡
(2011-03-27)
林嘉敏
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Department of Communication and Technology
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傳播與科技學系
剛開始來到台灣的時候，我真的徬徨無助，不知所措。本來以為台灣跟澳門的文化不會差太遠，所以應該還蠻好適應的，但後來發覺我所面對的問題不只是語言，還有食物和文化。我發覺人到了外地，總是會習慣使用本來的語言，總是會懷念家鄉的食物，總是愛比較兩地的文化。
我們這樣一群人　擁有什麼
(2011-03-27)
潘珮瑄
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Department of Communication and Technology
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傳播與科技學系
18到22歲的年輕人擁有的是什麼？