Browsing by Issue Date, starting with "2010-09-21"

Now showing 1 - 20 of 45318

Time-dependent density functional theory for quantum transport
(2010-09-21)
Zheng, Xiao
;
Chen, GuanHua
;
Mo, Yan
;
Koo, SiuKong
;
Tian, Heng
Based on our earlier works [X. Zheng , Phys. Rev. B 75, 195127 (2007); J. S. Jin , J. Chem. Phys. 128, 234703 (2008)], we propose a rigorous and numerically convenient approach to simulate time-dependent quantum transport from first-principles. The proposed approach combines time-dependent density functional theory with quantum dissipation theory, and results in a useful tool for studying transient dynamics of electronic systems. Within the proposed exact theoretical framework, we construct a number of practical schemes for simulating realistic systems such as nanoscopic electronic devices. Computational cost of each scheme is analyzed, with the expected level of accuracy discussed. As a demonstration, a simulation based on the adiabatic wide-band limit approximation scheme is carried out to characterize the transient current response of a carbon nanotube based electronic device under time-dependent external voltages. (c) 2010 American Institute of Physics. [doi:10.1063/1.3475566]
Time-dependent density functional theory for quantum transport
(2010-09-21)
Zheng, Xiao
;
Chen, GuanHua
;
Mo, Yan
;
Koo, SiuKong
;
Tian, Heng
Based on our earlier works [X. Zheng , Phys. Rev. B 75, 195127 (2007); J. S. Jin , J. Chem. Phys. 128, 234703 (2008)], we propose a rigorous and numerically convenient approach to simulate time-dependent quantum transport from first-principles. The proposed approach combines time-dependent density functional theory with quantum dissipation theory, and results in a useful tool for studying transient dynamics of electronic systems. Within the proposed exact theoretical framework, we construct a number of practical schemes for simulating realistic systems such as nanoscopic electronic devices. Computational cost of each scheme is analyzed, with the expected level of accuracy discussed. As a demonstration, a simulation based on the adiabatic wide-band limit approximation scheme is carried out to characterize the transient current response of a carbon nanotube based electronic device under time-dependent external voltages. (c) 2010 American Institute of Physics. [doi:10.1063/1.3475566]
Functionalized Silica Nanoparticles by Nanometallic Ag Decoration for Optical Sensing of Organic Molecule
(2010-09-23)
Jean, Ren-Der
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Chiu, Kuo-Chuang
;
Chen, Tsung-Han
;
Chen, Chun-Hua
;
Liu, Dean-Mo
Sensing technologies based on metallic nanoparticles, known as Ag, Au, and so on, have raised enormous interest for their extraordinary sensing resolution and sensitivity to analytes of chemical or biological importance under optical detection have received wide attention in recent decades. Currently, a discrete nanoparticle in a free-standing form, either being organically or biologically modified on the nanoparticle surface, on a given substrate surface region has been employed for photosensing purpose. However, metallic nanoparticles suffering from physical and chemical instability such as oxidation, interparticle coupling, agglomeration, and so on during the processing stages may render undesirable outcomes, which further results in poorer performance than the theoretical expectation. Here we propose a facile and elegant concept to prepare an Ag-decorated silica nanoparticle (hereinafter termed core-shell SiO(2)@Ag nanosphere) based on the modified Stober method. The Ag nanoparticles with an average size controlled at about 1, 3, and 5 nm deposited over the surface of the silica nanocarrier were well separated, making the resulting SiO(2)@Ag nanospheres. The nanospheres showed physically and optically stable surface plasmon resonance spectra and also demonstrated a relatively high Ag-sized dependent sensitivity to ppb level for the detection of analyte molecule, that is, melamine. Theoretical model fitting has been well managed to correlate the optical behavior of the nanosensors, and the outcomes strongly indicated a promising potential of the Ag-decorated SiO(2) core-shell nanospheres for sensory applications.
Molding structure with independent thermal control and its molding method
(2010-09-23)
Chen, Ren Haw
;
Liou, An Cheng
The present invention, in accordance with the shrinking behavior of heat-melt material during cooling and demolding of molding process, presents a molding structure with electrical heating lines embedded on the surface of the molding structure which allows the structure to provide independent thermal control. By allowing the mold to control its surface temperature, the thermal stress between the heat-melt material and the mold can be eliminated and balanced, thereby preventing the heat-melt material from damage by the gripping force during demolding process.
Anharmonic RRKM Calculation for the Dissociation of (H(2)O)(2)H(+) and Its Deuterated Species (D(2)O)(2)D(+)
(2010-09-23)
Song, Di
;
Su, Hongmei
;
Kong, Fan-ao
;
Lin, Sheng-Hsien
;
應用化學系分子科學碩博班
Investigations on the dissociation kinetics of hydrated protonium ions, (H(2)O)(2)H(+) and their deuterated species (H(2)O)(2)D(+), are reported based on the harmonic and anharmonic oscillator model using the transition state theory and ab initio calculations. We find that the dissociation of (H(2)O)(2)H(+) and (D(2)O)(2)D(+) exhibits a distinct threshold behavior due to the existence of activation energies. Moreover, the deviation between the harmonic and anharmonic dissociation rate constants becomes larger in the high energy or temperature range, with the rate constants becoming unreasonably large under the harmonic oscillator model. The isotope effect is found to become more distinct but only in the case of the anharmonic oscillator model. These results show that the anharmonic Rice-Ramsperger-Kassel-Marcus (RRKM) theory can provide a reasonably good description for the dissociation of (H(2)O)(2)H(+) and (D(2)O)(2)D(+). Furthermore, a theoretical model to demonstrate the principle of vibrational predissociation spectroscopy (VPS) is established from the viewpoint of RRKM theory and applied in determining the experimental conditions and understanding the role of the dissociation rate constant k(E) played in the VPS experiment, using (H(2)O)(2)H(+) and (H(2)O)(2)D(+) as examples.
Anharmonic RRKM Calculation for the Dissociation of (H2O)(2)H+ and Its Deuterated Species (D2O)(2)D+
(2010-09-23)
Song, Di
;
Su, Hongmei
;
Kong, Fan-ao
;
Lin, Sheng-Hsien
;
應用化學系分子科學碩博班
Investigations on the dissociation kinetics of hydrated protonium ions, (H2O)(2)H+ and their deuterated species (H2O)(2)D+, are reported based on the harmonic and anharmonic oscillator model using the transition state theory and ab initio calculations. We find that the dissociation of (H2O)(2)H+ and (D2O)(2)D+ exhibits a distinct threshold behavior due to the existence of activation energies. Moreover, the deviation between the harmonic and anharmonic dissociation rate constants becomes larger in the high energy or temperature range, with the rate constants becoming unreasonably large under the harmonic oscillator model. The isotope effect is found to become more distinct but only in the case of the anharmonic oscillator model. These results show that the anharmonic Rice-Ramsperger-Kassel-Marcus (RRKM) theory can provide a reasonably good description for the dissociation of (H2O)(2)H+ and (D2O)(2)D+. Furthermore, a theoretical model to demonstrate the principle of vibrational predissociation spectroscopy (VPS) is established from the viewpoint of RRKM theory and applied in determining the experimental conditions and understanding the role of the dissociation rate constant k(E) played in the VPS experiment, using (H2O)(2)H+ and (H2O)(2)D+ as examples.
LABEL-FREE SENSOR
(2010-09-23)
Meng, Hsin- Fei
;
Hong, Sheng-Fu
;
Chao, Yu-Chiang
;
Liu, Chien-Cheng
;
Liu, Wen-Hsing
A label-free sensor is disclosed. The label-free sensor comprises a substrate, a first electrode formed on the substrate, a second electrode formed on the substrate and spaced away from the first electrode, and a semiconductor layer formed on the substrate and is in contact with the first electrode and the second electrode, wherein the semiconductor layer has a plurality of probe groups, which are bonded to the semiconductor layer by functionalization, for sensing a coupling-specific substance, which has bonding specificity with the probe groups. The semiconductor layer of the label-free sensor of the present invention is bonded with probe groups, and the detection of detected object is performed in instant, quick, rapid, and sensitive manner by measuring variation in electric current, thereby avoiding the use of the fluorescent reading equipment for reading fluorescent signals.
Enhanced visible photoluminescence from ultrathin ZnO films grown on Si-nanowires by atomic layer deposition
(2010-09-24)
Chang, Yuan-Ming
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Jian, Sheng-Rui
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Lee, Hsin-Yi
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Lin, Chih-Ming
;
Juang, Jenh-Yih
Bright room temperature visible emission is obtained in heterostructures consisting of similar to 3.5 nm thick ZnO ultrathin films grown on Si-nanowires produced by means of self-masking dry etching in hydrogen-containing plasma. The ZnO films were deposited on Si-nanowires by using atomic layer deposition (ALD) under an ambient temperature of 25 degrees C. The orders of magnitude enhancement in the intensity of the room temperature photoluminescence peaked around 560 nm in the present ZnO/Si-nanowire heterostructures is presumably due to the high aspect (surface/volume) ratio inherent to the Si-nanowires, which has, in turn, allowed considerably more ZnO material to be grown on the template and led to markedly more efficient visible emission. Moreover, the ordered nanowire structure also features an extremely low reflectance (similar to 0.15%) at 325 nm, which may further enhance the efficiency of emission by effectively trapping the excitation light.
《線人》
(2010-09-26)
林嘉敏
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Department of Communication and Technology
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傳播與科技學系
線人，也就是內奸的意思，跟臥底不一樣。線人是真正的黑幫人物，他們可能會因為錢，或是其他的因素，出賣自己的組織，協助警方破案以獲取他們應得的酬勞。《線人》是林超賢導演在2010年所執導的香港動作電影，沿用《證人》的演員以及幕後班底，其中包括張家輝、謝霆鋒、廖啟智等，而桂綸美也首次拋棄了清純的形象，嘗試扮演心狠手辣的黑道女人。
經典動畫主題曲席捲全球
(2010-09-26)
康甯
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Department of Communication and Technology
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傳播與科技學系
小時候，我們曾經共同經歷過這些冒險：跟隨娜烏西卡在風之谷飛行、陪著希達和帕斯尋找天空之城、搭乘夜晚毛絨絨的龍貓巴士、騎著魔女奇奇的掃把翱翔、與小桑和阿西達卡乘著狼穿梭於山林間、伴隨千尋誤闖神靈世界…。帶領我們擁有這些冒險的創作者──宮崎駿，相信大家一定都不陌生。
《唐山大地震》
(2010-09-26)
周揚珊
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Department of Communication and Technology
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傳播與科技學系
這部片是由張翎的小說《餘震》改編，1972年的7月28日，唐山發生了芮氏7.2級規模的大地震，李元妮(徐帆飾)的丈夫先是在短短23秒的天崩地裂中喪命，接著她又面臨了絕境，她的一對龍鳳胎被壓在同一塊水泥板下，撬開兒子這邊就會壓到女兒那邊，撬開女兒這邊就會壓壞兒子這邊，二選一，天災把一個母親逼到人性最黑暗的角落裡，最後她選擇救兒子。原以為在地震中身亡的女兒，被解放軍的養父母一手帶大，心理卻留著被親身母親放棄的傷疤，直到32年後的汶川大地震，母女再度相逢，才慢慢解開心結。
獻花給阿爾吉儂
(2010-09-26)
陳俐吟
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Department of Communication and Technology
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傳播與科技學系
即使你沒聽過《獻給阿爾吉儂的花束》這本書，也一定聽過丹尼爾‧凱斯的另外兩本著作，《二十四個比利》和《第五位莎莉》──這兩本關於人格分裂的名作。《獻給阿爾吉儂的花束》，是丹尼爾在1959年出版的處女作，同時獲得科幻小說界的兩項大獎──星雲獎和雨果獎，除了使他一鳴驚人之外，也改拍為電影《Flowers For Algernon》、日劇《獻花給倉鼠》，甚至連極少採用外國素材的韓劇，都將本書改拍為《你好！上帝》，即使這三部片側重的劇情表現皆不同，但都獲得一致好評。時隔51年的今日，這本書以全新譯本的姿態再次出版，究竟是怎麼樣的一本書，能歷久而不衰，又是怎麼樣一本書，使眾多讀者潸然淚下呢？
烈日千揚重壓下的變革
(2010-09-26)
顏學廷
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Department of Communication and Technology
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傳播與科技學系
關於LINKIN PARK新專輯A Thousand Suns的樂評應該會提到NU METAL跟近兩張的曲風改變還有他們所謂的人文關懷議題加上這張專輯裡面的迷幻感跟曲目連貫性
生活在爵士創造新體驗
(2010-09-26)
陳蕾
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Department of Communication and Technology
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傳播與科技學系
你聽過由台灣人創作的爵士樂嗎?在台灣的樂壇裡，最常見的就是國語流行音樂、台語音樂及國外流行音樂，雖然台灣，尤其在北部，有一些爵士樂的相關活動，例如八里水岸爵士節、夏日爵士派對等，但是真正會聽或會創作爵士樂的人依然是少之又少。我們目前可以在電視上看到的爵士樂創作者，就是原住民歌手昊恩和家家，他們曾在2006年發行「藍色情詩篇」，將爵士樂與原住民音樂結合，再搭配上原住民獨特的嗓音，讓人印象深刻。其實，除了昊恩和家家，在台灣爵士樂圈中，還有一個極力推廣爵士音樂，卻鮮為人知的團體─啟彬與凱雅
大眾與藝術之間《白蛇傳》
(2010-09-26)
李庭蕙
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Department of Communication and Technology
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傳播與科技學系
炎炎夏日，如何能不待在家中吹冷氣，也能消消暑，解解悶。答案不只有到大賣場吹冷氣。到戶外欣賞明華園《超炫白蛇傳》（以下簡稱白蛇傳），體驗水漫金山寺，享受傳統戲曲之美，也是另一種絕佳的選擇。《白蛇傳》自推出以來，已演出過八大場，人數總計突破六十萬人次，堪稱國內戲曲中的經典之作。
我「不乖」故我在
(2010-09-26)
林映綺
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Department of Communication and Technology
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傳播與科技學系
繼《沒有神的所在》，侯文詠在2010年推出新書《不乖：比標準答案更重要的事》。從臨床醫師到專職作家，侯文詠認為是因為自己「不乖」，因為「不乖」，他才有機會成為編劇、廣播主持人，甚至是名電視劇製作人，不乖不代表沒有想法、沒有未來。侯文詠：「是這些『不乖』、『不聽話』的作為或決定，一點一滴造就出了今天我的人生非常決定性的部分。」
《父後七日》
(2010-09-26)
林書羽
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Department of Communication and Technology
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傳播與科技學系
心理治療師及靈修者皆言：每個人內在都有一個小孩。我卻常覺得，我內在有兩個小孩。一個永遠精神充沛、跑跑跳跳對我說：「要好看、要好笑啊!」另一個孤獨晃遊，消磨悠悠長日，醞釀著小小的歹惡念頭：「嘿，搞怪一下，忘掉憂愁吧!」
三島屋怪談鬼說人間話
(2010-09-26)
劉芮菁
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Department of Communication and Technology
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傳播與科技學系
對酒當歌，人生幾何？譬如朝露，去日苦多。千年前的曹操以一首《短歌行》感嘆生命無常，人生短暫。而即使是在許多詩詞曲賦中象徵永恆的自然山川，「滄海桑田」、「物換星移」等成語也說明了他們逃不過時間的掌控。然而，在變幻莫測的世間，仍有一項東西是亙古不變的，它歷經千年而不衰，如罈酒般愈陳愈香，幽幽地來到現代並進駐人類社會，這就是情感，是各種各樣的悲歡離合，交織出社會人情的千百種面貌。情感，正是《怪談》一書的刻劃對象。
菲常不一樣台北星期天
(2010-09-26)
王雅涵
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Department of Communication and Technology
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傳播與科技學系
首部由外勞導演所拍攝的外勞電影──《台北星期天》挑戰了台灣觀眾的胃口。《台北星期天》跳脫以往台灣外籍勞工遭受不人道待遇的角度，以不落俗套的新風格，輕鬆又不失寫實地為台北寫下新的一頁。不少電影作品都以城市美景為主題，如《巴黎我愛你》、《情遇巴塞隆納》，這些電影透過歌頌美好戀情並結合當地語言、文化和建築特色，用異國情懷將城市層層包裝並加以宣傳，一個個原屬於「人」的故事被塑造成宛如是城市本身。
大玩特玩遊戲美學
(2010-09-26)
張宇翔
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Department of Communication and Technology
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傳播與科技學系
台北當代藝術館正在展出美國著名遊戲公司暴風雪(Blizzard Entertainment)的電玩遊戲圖稿與設定模型，提供了觀看電玩產業的另一種角度，文章的重點放在美感經驗如何透過藝術館這樣的場合來建立，以及展出作品、展出空間與參觀者的互動關係，最後指出這個展覽如何試圖建立一個另類的美學觀點。