Browsing by Issue Date, starting with "2007-12-21"

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Infrared absorption of gaseous CH(3)OO detected with a step-scan Fourier-transform spectrometer
(2007-12-21)
Huang, Deng-Ruei
;
Chu, Li-Kang
;
Lee, Yuan-Pern
;
應用化學系分子科學碩博班
;
Institute of Molecular science
CH(3)OO radicals were produced upon irradiation of a flowing mixture of CH(3)I and O(2) with a KrF excimer laser at 248 nm. A step-scan Fourier-transform spectrometer coupled with a multipass absorption cell was employed to record temporally resolved IR absorption spectra of reaction intermediates. Transient absorption bands with origins at 3033, 2954, 1453, 1408, 1183, 1117, 3020, and 1441 cm(-1) are assigned to nu(1)-nu(6), nu(9), and nu(10) modes of CH(3)OO, respectively, close to wavenumbers reported for CH(3)OO isolated in solid Ar. Calculations with density-functional theory (B3LYP/aug-cc-pVTZ) predicted the geometry and the vibrational wavenumbers of CH(3)OO; the vibrational wavenumbers and relative IR intensities of CH(3)OO agree satisfactorily with these observed features. The rotational contours of IR spectra of CH(3)OO, simulated based on ratios of predicted rotational parameters for the upper and lower states and on experimental rotational parameters of the ground state, agree satisfactorily with experimental results; the mixing ratios of a-, b-, and c-types of rotational structures were evaluated based on the direction of dipole derivatives predicted quantum chemically. A feature at 995 cm(-1), ascribed to CH(3)OOI from a secondary reaction of CH(3)OO with I, was also observed. (c) 2007 American Institute of Physics.
Infrared absorption of gaseous CH3OO detected with a step-scan Fourier-transform spectrometer
(2007-12-21)
Huang, Deng-Ruei
;
Chu, Li-Kang
;
Lee, Yuan-Pern
;
應用化學系
;
應用化學系分子科學碩博班
CH3OO radicals were produced upon irradiation of a flowing mixture of CH3I and O-2 with a KrF excimer laser at 248 nm. A step-scan Fourier-transform spectrometer coupled with a multipass absorption cell was employed to record temporally resolved IR absorption spectra of reaction intermediates. Transient absorption bands with origins at 3033, 2954, 1453, 1408, 1183, 1117, 3020, and 1441 cm(-1) are assigned to nu(1)-nu(6), nu(9), and nu(10) modes of CH3OO, respectively, close to wavenumbers reported for CH3OO isolated in solid Ar. Calculations with density-functional theory (B3LYP/aug-cc-pVTZ) predicted the geometry and the vibrational wavenumbers of CH3OO; the vibrational wavenumbers and relative IR intensities of CH3OO agree satisfactorily with these observed features. The rotational contours of IR spectra of CH3OO, simulated based on ratios of predicted rotational parameters for the upper and lower states and on experimental rotational parameters of the ground state, agree satisfactorily with experimental results; the mixing ratios of a-, b-, and c-types of rotational structures were evaluated based on the direction of dipole derivatives predicted quantum chemically. A feature at 995 cm(-1), ascribed to CH3OOI from a secondary reaction of CH3OO with I, was also observed. (c) 2007 American Institute of Physics.
理想‧自由－鄔定衡
(2007-12-23)
吳念慈
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Department of Communication and Technology
;
傳播與科技學系
從大學生失業率高、起薪又低說起。許多高中生放棄一般的大學生活，選擇投入軍警體系，生活規律、薪水穩定，減輕父母不少學雜費的負擔，但犧牲了自由與理想。鄔定衡，政戰學校心理系畢業兩年，畢業分發抽到海巡，目前是基隆和平島安全檢查所副所長。畢業後沒有歷經待業的過程，順利踏入社會，但是工作時間不自由，日夜顛倒，工作內容與所學的心理也大相逕庭，所以他打算重拾書本，考心理研究所在職專班，走一條自己想走的路。
「萬般皆下品　唯有讀書高」？
(2007-12-23)
盧沛樺
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Department of Communication and Technology
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傳播與科技學系
從一起自殺案件端倪台灣教改制度
王柏升─MEEYA讓人與人更靠近
(2007-12-23)
姜建亨
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Department of Communication and Technology
;
傳播與科技學系
於12/19正式上線的ｍｅｅｙａ是一個網路平台有點像是一個人脈網可以連結校園社群人脈介紹創辦人及創辦理念與中間心路歷程
網路相簿　網路美女效應
(2007-12-23)
黃夙蓮
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Department of Communication and Technology
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傳播與科技學系
網路美女變相發燒
科學園區　規劃下的世外桃源
(2007-12-23)
呂伯芬
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Department of Communication and Technology
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傳播與科技學系
園區不為人知的一面
話說聖誕
(2007-12-23)
謝甄芳
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Department of Communication and Technology
;
傳播與科技學系
節慶
博彩業蓬勃發展─澳門
(2007-12-23)
鄧詠兒
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Department of Communication and Technology
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傳播與科技學系
博彩業蓬勃的發展下
永不輕言放棄─洪國恩
(2007-12-23)
汪承漢
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Department of Communication and Technology
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傳播與科技學系
電控99洪國恩雖然兩腿膝蓋都開過刀但熱愛籃球的他仍不放棄籃球
網路遊戲的是與非
(2007-12-23)
陳濡群
;
Department of Communication and Technology
;
傳播與科技學系
現代網路遊戲蓬勃發展但也帶來一些隱憂因此來探討其中的現象
滾滾韓流－中國V.S韓國
(2007-12-23)
沈昭邦
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Department of Communication and Technology
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傳播與科技學系
無論韓國經濟是不是真的比台灣好，他們的GNP比台灣人民高已是不爭的事實，這本書以一個大陸人的觀點來看韓國這個國家
第十二期總編輯的話
(2007-12-23)
彭敬雅
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Department of Communication and Technology
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傳播與科技學系
總編輯的話
龐克文化　教條閃邊站
(2007-12-23)
蔡昇峰
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Department of Communication and Technology
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傳播與科技學系
地下樂團拷秋勤嗩吶手阿雞專訪受訪者臨時因故無法接受採訪，本週改發文化現象，人物專訪順延至下週發稿。
商業炒作　歡樂無限
(2007-12-23)
鄭瑋津
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Department of Communication and Technology
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傳播與科技學系
聖誕節、情人節、跨年已經變成一種商業化的產物，在商人、媒體的炒作之下，這些節日變成了什麼模樣。
《變人》「他」？或是「它」？
(2007-12-23)
林暐家
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Department of Communication and Technology
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傳播與科技學系
一部感人電影
科技新貧　電子業的瓶頸與未來
(2007-12-23)
楊宇軒
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Department of Communication and Technology
;
傳播與科技學系
創造台灣奇蹟的電子產業，到今天已成為低毛利率、低附加價值的事業，台灣未來電子產業會如何發展?有哪些機會?
Size dependence of the electronic structures and electron-phonon coupling in ZnO quantum dots
(2007-12-24)
Ray, S. C.
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Low, Y.
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Tsai, H. M.
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Pao, C. W.
;
Chiou, J. W.
The electronic structures and optical properties of various sizes of ZnO quantum dots (QDs) were studied using x-ray absorption, photoluminescence, and Raman spectroscopy. The increase in the intensity ratio of the second-order Raman spectra of longitudinal optical mode and its fundamental mode, which is related to the strength of the electron-phonon coupling (EPC), is found to increase with the size of QD. The trend of EPC also correlates with the increase of the intensity ratio of the O 2p(pi) (I(pi)) and 2p(sigma) (I(sigma)) orbital features in the O K-edge x-ray absorption near-edge structure (XANES) as the size of QD increases. The EPC and XANES results suggest that the crystal orientations of ZnO QDs are approximately aligned with the c axis parallel with the polarization of x-ray photons. (c) 2007 American Institute of Physics.
Triple-wavelength erbium fiber ring laser based on compound-ring scheme
(2007-12-24)
Yeh, Chien Hung
;
Shih, Fu Yuan
;
Chen, Chang Tai
;
Chi, Sien
;
光電工程學系
A triple-wavelength erbium-doped compound ring fiber laser using the fiber-based triple-ring filter (TRF) is proposed and experimentally investigated. Using the fiber-based TRF laser scheme, the proposed laser can lase three wavelengths simultaneously. The fiber laser retrieve the optical side-mode suppression ratios (SMSRs) of 40.2, 40.4 and 41.6 dB and the output powers of -9, -8.8 and -7.6 dBm at the wavelengths 1555.89, 1556.77 and 1557.66 nm, respectively. The mode spacing of the triple-wavelength fiber laser is nearly 0.9 nm. Moreover, the output power stability of the ring laser has also been measured and analyzed. (c) 2007 Optical Society of America.
Wideband tunable wavelength-selective coupling in asymmetric side-polished fiber coupler with dispersive interlayer
(2007-12-24)
Chen, Nan-Kuang
;
Lee, Cheng-Ling
;
Chi, Sien
;
光電工程學系
;
Department of Photonics
We demonstrate tunable highly wavelength-selective filter based on a 2 x 2 asymmetric side-polished fiber coupler with dispersive interlayer in one of the coupling arms. The asymmetric fiber coupler is made of two side-polished fibers using identical single-mode fibers and one of the polished fibers is further chemically etched at the central evanescent coupling region to gain closer to the core. An optical liquid with different dispersion characteristics than that of silica fiber is used to fill up the etched hollow and therefore the propagation constant for the polished fiber with dispersive liquid becomes more dispersive and crosses with that of another untreated polished fiber. The location of the cross point and the cross angle between two propagation constant curves determine the coupling wavelength and coupling bandwidth as well as channel wavelength separation, respectively. The coupling wavelength can be tuned at least wider than 84 nm (1.326-1.410 mu m) under index variation of 0.004 and with coupling ratios of higher than 30 dB. (c) 2007 Optical Society of America.