Browsing by Issue Date, starting with "2016-03-17"

Now showing 1 - 20 of 17774

Poisson-Fermi Modeling of the Ion Exchange Mechanism of the Sodium/Calcium Exchanger
(2016-03-17)
Liu, Jinn-Liang
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Hsieh, Hann-jeng
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Eisenberg, Bob
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應用數學系
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Department of Applied Mathematics
The ion exchange mechanism of the sodium/calcium exchanger (NCX) crystallized by Liao et al. in 2012 is studied using the Poisson Fermi theory developed by Liu and Eisenberg in 2014. A cycle of binding and unbinding is proposed to account for the Na+/Ca2+ exchange function of the NCX molecule. Outputs of the theory include electric and steric fields of ions with different sizes, correlations of ions of different charges, and polarization of water, along with number densities of ions, water molecules, and interstitial voids. We calculate the electrostatic and steric potentials of the four binding sites in NCX, i.e., three Nal" binding sites and one Ca2+ binding site, with protein charges provided by the software PDB2PQR. The energy profiles of Na+ and Ca2+ ions along their respective Na+ and Ca2+ pathways in experimental conditions enable us to explain the fundamental mechanism of NCX that extrudes intracellular Ca2+ across the cell membrane against its chemical gradient by using the downhill gradient of Nat Atomic and numerical details of the binding sites are given to illustrate the 3 Na+:1 Ca2+ stoichiometry of NCX. The protein NCX is a catalyst. It does not provide (free) energy for transport. All energy for transport in our model comes from the ions in surrounding baths.
Manipulating Polycrystalline Silicon Nanowire FET Characteristics by Light Illumination
(2016-03-17)
Chen, Chien-Hung
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Lin, Chih-Heng
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Yang, Yuh-Shyong
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Hwang, Chi-Hung
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生物科技學系
Polycrystalline silicon nanowire field-effect transistor (poly-SiNW FET) has attracted many attentions in the past decade because of its ultrasensitive, label-free, and real-time response for potential sensing applications particular for biosensors. In this paper, the changes of the electric characteristics of poly-SiNW FET introduced by light illumination are studied systematically. Particularly, the red light (635 nm) and UV light (365 nm) are employed as light sources. Both lights are projected on the poly-SiNW FETs installed and are tested in air or in a vacuum (0.1 Ton) chamber. The results show that both light sources can change the electric characteristics of poly-SiNW FET which indicates that the photoelectronic effect can manipulate both n- and p-type devices of poly-SiNW FET; meanwhile, results also support the potential of poly-SiNW FET in air and in the vacuum environment for optoelectronic sensing applications.
Properties of Plasmon-Induced Photoelectric Conversion on a TiO2/NiO p-n Junction with Au Nanoparticles
(2016-03-17)
Nakamura, Keisuke
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Oshikiri, Tomoya
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Ueno, Kosei
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Wang, Yongming
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Kamata, Yoshiomi
We have successfully fabricated all-solid-state plasmonic photoelectric conversion devices composed of titanium dioxide (TiO2)/nickel oxide (NiO) p-n junctions with gold nanoparticles (Au-NPs) as prototype devices for a plasmonic solar cell. The characteristics of the crystal structures and the photoelectric properties of the all-solid-state devices were demonstrated. We observed that the crystalline structure of the NiO thin film and the interfacial structure of TiO2/Au-NPs/NiO changed significantly during an annealing treatment. Furthermore, the photoelectric conversion devices exhibited plasmon-induced photocurrent generation in the visible-wavelength region. The photo current may result from plasmon-induced charge separation. The photoelectric conversion properties via plasmon-induced charge separation were strongly correlated with the morphology of the TiO2/Au-NPs/NiO interface. The long-term stability of the plasmonic photoelectric conversion device was found to be very high because a stable photocurrent was observed even after irradiation for 3 days.
Synthesis and Isomeric Effects of Ladder-Type Alkylated Terbenzodithiophene Derivatives
(2016-03-18)
Chen, Yung-Lung
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Hsu, Jhih-Yang
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Lin, Fang-Yu
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Lai, Yu-Ying
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Chou, Hsiao-Chieh
A new class of heptacyclic ladder-type terbenzodithiophene (TBDT) structures merging three fused benzodithophenes was developed. Two TBDT conjugated isomers, named as syn-TBDT and anti-TBDT, where the two thienyl rings in the outmost BDT units are in the syn- and anti-fashion, are designed. Two decyl groups are introduced to their 6,13 and 7,14-positions to form four isomeric 6,13-syn-TBDT, 7,14-syn-TBDT, 6,13-anti-TBDT, and 7,14-anti-TBDT structures which are constructed by the DBU-induced 6-benzannulation involving propargyl-allenyl isomerization of the dieneyne moieties in the corresponding precursors followed by 6 pi-electro-cyclization/aromatization, while isomeric TD-syn-TBDT and TD-anti-TBDT with four decyl groups substituted at 6,7,13,14-positions are synthesized via palladium-catalyzed dialkylacetylene insertion/C-H arylation of the corresponding iodobiaryl precursors. The intrinsic properties can be modulated by molecular manipulation of the main-chain and side-chain isomeric structures. anti-TBDT derivatives exhibit higher melting points, larger bandgaps, stronger intermolecular interactions, and higher mobility than the corresponding syn-TBDT analogues. These molecules can be further utilized as building blocks to make various TBDT-based materials for optoelectronic applications.
Photo-induced Doping in GaN Epilayers with Graphene Quantum Dots
(2016-03-18)
Lin, T. N.
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Inciong, M. R.
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Santiago, S. R. M. S.
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Yeh, T. W.
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Yang, W. Y.
We demonstrate a new doping scheme where photo-induced carriers from graphene quantum dots (GQDs) can be injected into GaN and greatly enhance photoluminescence (PL) in GaN epilayers. An 8.3-fold enhancement of PL in GaN is observed after the doping. On the basis of time-resolved PL studies, the PL enhancement is attributed to the carrier transfer from GQDs to GaN. Such a carrier transfer process is caused by the work function difference between GQDs and GaN, which is verified by Kelvin probe measurements. We have also observed that photocurrent in GaN can be enhanced by 23-fold due to photo-induced doping with GQDs. The improved optical and transport properties from photoinduced doping are promising for applications in GaN-based optoelectronic devices.
漫遊輕小說
(2016-03-20)
陳緯僑
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Department of Communication and Technology
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傳播與科技學系
輕小說是許多年輕人愛不釋手的讀物之一，除了讀者，其影響力也間接擴及青少年的生活與次文化當中。
職棒二十六　精彩回顧
(2016-03-20)
李宗諺
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Department of Communication and Technology
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傳播與科技學系
中華職棒迄今邁入第二十七個年頭，每一年都有它值得回味的地方，讓我們回顧去年、放眼今年。
勇敢相伴　與過往和解
(2016-03-20)
孔婉寧
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Department of Communication and Technology
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傳播與科技學系
當生命遇上前所未有的低谷時，向下沉淪或往上提升是唯一的路，該如何選擇？
金馬導演報你知
(2016-03-20)
許凱智
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Department of Communication and Technology
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傳播與科技學系
細數臺灣電影最高殊榮的金馬導演們的那些小事，看看他們都有哪些特質。
旅社整建　小西風華再現
(2016-03-20)
唐宜嘉
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Department of Communication and Technology
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傳播與科技學系
位於彰化小西街內的紅葉大旅社，經過整修與改建後再現五〇年代的風華。
1949青旅　打造台灣文創夢
(2016-03-20)
鄭宇茹
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Department of Communication and Technology
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傳播與科技學系
一群年輕人以青年旅館出發創業，期望能做到文化保存的目標。
竊取原創　淪為設計抄襲
(2016-03-20)
修瑞韓
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Department of Communication and Technology
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傳播與科技學系
設計抄襲時常發生，但是大眾對於抄襲的定義與程度模糊。
活生生　生命的再賦予
(2016-03-20)
黃美恩
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Department of Communication and Technology
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傳播與科技學系
兩位北藝大的學生，在這個別有特殊意義的城市，舉辦一場活生生的雙人展。
轉型正義　正視撕裂的歷史
(2016-03-20)
胡浣莊
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Department of Communication and Technology
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傳播與科技學系
轉型正義是當今政府及民眾熱議的話題，無論是黨產還是白色恐怖，皆有待平反。
邁向高齡　台灣政策亮警戒
(2016-03-20)
謝萱穎
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Department of Communication and Technology
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傳播與科技學系
隨著醫療的進步發展，全球已經逐步邁向高齡、超高齡社會，未來甚至恐將出現人口負成長的現象。
自由人公寓　藝術交流平台
(2016-03-20)
林謙耘
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Department of Communication and Technology
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傳播與科技學系
自由人藝術公寓為一個結合展覽、咖啡廳、酒吧、住宿的複合式展場。
搖滾傳奇　披頭四
(2016-03-20)
趙廣絜
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Department of Communication and Technology
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傳播與科技學系
以互動式動畫介紹搖滾樂團披頭四（The Beatles）。
外籍勞工在臺灣
(2016-03-20)
翁世樺
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Department of Communication and Technology
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傳播與科技學系
隨著外籍勞工在臺人數的增加，其相關議題也受到重視。
新聞賣錢以後
(2016-03-20)
許人文
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Department of Communication and Technology
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傳播與科技學系
探討收視率主導下，新聞媒體守門人功能不再，新聞品質低落等媒體亂象頻傳，該如何才能打破收視率的迷思？
我的熊爸爸
(2016-03-20)
梅瑞庭
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Department of Communication and Technology
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傳播與科技學系
細田守在二〇一五年推出的第四部動畫電影【怪物的孩子】，描述人類的小孩在妖怪界長大成人的故事。