Browsing by Issue Date, starting with "2012-03-13"

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Autoionization rate constants of zero electron kinetic energy Rydberg states
(2012-03-13)
Mineo, H.
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Wang, Y. H.
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Chao, S. D.
;
Lin, S. H.
;
應用化學系
We have calculated the vibrational and rotational autoionization rate constants for diatomic molecules H-2, N-2, and HCl in high Rydberg states by employing the density matrix formulation with the inverse Born-Oppenheimer approximation basis set. The purpose is to simulate the main radiationless processes occurring in zero electron kinetic energy (ZEKE) spectroscopy. The quantum numbers and the energy dependences of the calculated autoionization rate constants are represented as the scaling laws via nonlinear regression. These data provide a suitable starting point for quantitative study of the intricate dynamics involved in ZEKE Rydberg states. (C) 2012 Elsevier B. V. All rights reserved.
Capacitive touch panel
(2012-03-13)
Chen Jian-Ting
;
Chao Paul C.-P.
;
Ruan Jyun-Yao
A capacitive touch panel with particular conductive pattern design reduces the mutual interference between the upper and lower electrode and perform three-dimensional capacitance detection and double-faced detection, and may be applied in large dimension touch panel with high sensitivity.
Transition dipole moments of charge transfer excitations in one-component molecular crystals
(2012-03-13)
Mazur, Grzegorz
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Petelenz, Piotr
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Slawik, Michal
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應用化學系
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Department of Applied Chemistry
Owing to the peculiar structure of oligothiophene crystals, their low-energy b-polarized spectra are dominated by the contributions from charge transfer states almost free from Frenkel state admixtures, offering a unique opportunity for in-depth studies of the former. Here, a simple model, rooted in the Mulliken theory of charge transfer transitions, is proposed to estimate the relevant transition dipole moments. For sexithiophene, the resultant estimate agrees with the value used in the recent detailed theoretical reproduction of the absorption and electroabsorption spectra, and is found to be consistent with other input parameters. The approach presented here is readily applicable for other one-component molecular crystals, providing a simple method to estimate the intrinsic transition dipoles of charge transfer configurations. (C) 2012 Elsevier B.V. All rights reserved.
Local structures in ionic liquids probed and characterized by microscopic thermal diffusion monitored with picosecond time-resolved Raman spectroscopy
(2012-03-14)
Yoshida, Kyousuke
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Iwata, Koichi
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Nishiyama, Yoshio
;
Kimura, Yoshifumi
;
Hamaguchi, Hiro-o
Vibrational cooling rate of the first excited singlet (S1) state of trans-stilbene and bulk thermal diffusivity are measured for seven room temperature ionic liquids, C2mimTf2N, C4mimTf2N, C4mimPF6, C5mimTf2N, C6mimTf2N, C8mimTf2N, and bmpyTf2N. Vibrational cooling rate measured with picosecond time-resolved Raman spectroscopy reflects solute-solvent and solvent-solvent energy transfer in a microscopic solvent environment. Thermal diffusivity measured with the transient grating method indicates macroscopic heat conduction capability. Vibrational cooling rate of S1 transstilbene is known to have a good correlation with bulk thermal diffusivity in ordinary molecular liquids. In the seven ionic liquids studied, however, vibrational cooling rate shows no correlation with thermal diffusivity; the observed rates are similar (0.082 to 0.12 ps-1 in the seven ionic liquids and 0.08 to 0.14 ps-1 in molecular liquids) despite large differences in thermal diffusivity (5.4-7.5 x 10-8 m2 s-1 in ionic liquids and 8.0-10 x 10-8 m2 s-1 in molecular liquids). This finding is consistent with our working hypothesis that there are local structures characteristically formed in ionic liquids. Vibrational cooling rate is determined by energy transfer among solvent ions in a local structure, while macroscopic thermal diffusion is controlled by heat transfer over boundaries of local structures. By using " local" thermal diffusivity, we are able to simulate the vibrational cooling kinetics observed in ionic liquids with a model assuming thermal diffusion in continuous media. The lower limit of the size of local structure is estimated with vibrational cooling process observed with and without the excess energy. A quantitative discussion with a numerical simulation shows that the diameter of local structure is larger than 10 nm. If we combine this lower limit, 10 nm, with the upper limit, 100 nm, which is estimated from the transparency (no light scattering) of ionic liquids, an order of magnitude estimate of local structure is obtained as 10 nm < L < 100 nm, where L is the length or the diameter of the domain of local structure. c 2012 American Institute of Physics. [ http:// dx. doi. org/ 10.1063/ 1.3691839]
騎士詩人但丁愛的哲學
(2012-03-14)
林惠玲
;
開放教育推動中心
;
Open Education Office
課程首頁本課程是由交通大學新文藝復興閱讀計畫提供。 96 年 8 月當各大學紛紛摩拳擦掌準備迎接新生的同時，交通大學校長吳重雨則因為一則來自於七月份泰晤士報，有關於英國首相布朗公布其夏日讀書清單的新聞中，看到了他對知識的尊重。在這同時，吳重雨校長也思考著，要如何為學生準備追求知識的環境和激發他們對知識的尊重與喜愛。台積電張忠謀董事長曾陳述他 18 歲進入哈佛那一年，博覽文史哲理工經典群籍，至此奠定了他求知的基礎，並借海明威名言，將其改為「哈佛這一年為人生可帶走的盛宴。」吳重雨校長以張董事長的學習為借鏡，認為學生固然能藉由自我閱讀的方式學習到豐沛的知識，但透過名人、大師親臨現場地介紹經典書籍，更能加深學子們對於書籍的認識與興趣，這也是「新文藝復興閱讀計劃」 ( 以下簡稱 : 「經典名著選讀」 ) 活動展開籌劃的緣由。於是，吳重雨校長便積極敦請「交大通識教育委員會」，接手籌備本計劃的相關活動，而該中心也成為實際施行本計畫的策動、開課以及認證單位。至此，期許交大學子藉由閱讀、聽講來提昇人文素養、開拓視野的「新文藝復興閱讀計劃」，就此展開。
Acyl and Silyl Group Effects in Reactivity-Based One-Pot Glycosylation: Synthesis of Embryonic Stem Cell Surface Carbohydrates Lc(4) and IV(2)Fuc-Lc(4)
(2012-03-14)
Hsu, Yun
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Lu, Xin-An
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Zulueta, Medel Manuel L.
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Tsai, Chih-Ming
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Lin, Kuo-I
Relative reactivity evaluations showed the graded arming of toluenyl thioglucosides by variously positioned silyl groups but not by their acyl counterparts. These findings were applied in reactivity-based one-pot assembly of linker-attached Lc(4) and IV(2)Fuc-Lc(4), which are components of human embryonic stem cell surface. The sugar-galectin-1 binding was also examined.
INTERACTIVE BIOSENSING DEVICE AND METHOD THEREOF
(2012-03-15)
LIN BOR-SHYH
;
LIN CHIN-TENG
;
CHAO CHIH-FENG
;
HUNG SHAO-HANG
;
WANG I-JAN
The present invention discloses an interactive biosensing device and a method thereof. The interactive biosensing device is arranged on a living body and comprises a physiological detection module detecting physiological signals of the living body; a physical sensation module triggering at least one physical device according to control instructions; a first wireless transmission module receiving control instructions or sends out physiological signals; a storage module storing physiological signals and control instructions; a video module capturing images of the living body; a control module processing physiological signals and control instructions and controlling operations of the video module; and a display unit presenting the images captured by the video module.
Characterizations of UV-Curable Montmorillonite/Epoxy Nanocomposites Prepared by a Hybrid of Chemical Dispersion and Planetary Mechanical Milling Process
(2012-03-15)
Huang, Heh-Chang
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Huang, Shu-Ping
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Hsieh, Tsung-Eong
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Chen, Chin-Hsin
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材料科學與工程學系
Ammonium salt, [2-(methacyloyloxy)ethyl] trimethylammonium methyl sulfate (MAOTMA), was adopted to modify montmorillonite (MMT) via the cationic exchange process in an acidic environment and a successful enlargement of MMT lamellar spacing from 1.18 to 1.39 nm was identified by x-ray diffraction and Fourier-transform infrared spectroscopy. Accordingly, UV-curable epoxy nanocomposite resins containing various amounts of MAOTMA-modified MMT were prepared with the aid of a planetary mechanical milling process. Transmission electron microscopy revealed a uniform dispersion of exfoliated MMT lamella in epoxy matrix, leading to the distinct improvements on thermal stability and thermal expansion property of nanocomposite samples. Calcium (Ca) test indicated that the good dispersion of MMT fillers in polymer effectively suppresses the moisture permeation in sample matrix. More than twofold increment on retention time of 5% Ca hydrolysis and 20% improvement on the permeation kinetic parameters were observed in the nanocomposite sample containing 8 wt % MMT in comparison with the pristine epoxy sample. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 3199-3207, 2012
n-ZnO/LaAlO3/p-Si heterojunction for visible-blind UV detection
(2012-03-15)
Tasi, D. S.
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Kang, C. F.
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Wang, H. H.
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Lin, C. A.
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Ke, J. J.
A visible-blind UV photodetector (PD) using a double heterojunction of n-ZnO/LaAlO3 (LAO)/p-Si was demonstrated. Inserted LAO layers exhibit electrical insulating properties and serve as blocking layers for photoexcited electrons from p-Si to n-ZnO, leading to an enhanced rectification ratio and a visible-blind UV detectivity of the n-ZnO/LAO/p-Si PDs due to the high potential barrier between LAO and p-Si layers (similar to 2.0 eV). These results support the use of n-ZnO/LAO/p-Si PDs in the visible-blind UV PDs in a visible-light environment. (C) 2012 Optical Society of America
Competing magnetic interactions and interfacial frozen-spins in Ni-NiO core-shell nano-rods
(2012-03-15)
Hsu, Hao-Chun
;
Lo, Chih-Chieh
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Tseng, Yuan-Chieh
;
材料科學與工程學系
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Department of Materials Science and Engineering
This paper investigates the subtle interfacial magnetism of highly-aligned, free-standing Ni-NiO core-shell rods on a Si substrate, fabricated by electroless-plating and an anodic aluminum oxide template. Transmission electron microscopy found that the NiO shell was uniformly present along the entire rod. Vertical magnetization shift, arising from opposite field cooling conditions, suggests frozen spins (FS) at the Ni-NiO interface. The FS were related to the pinning effects of the NiO on the Ni. The pinning strength depended on the NiO thickness, displaying a tunable fashion from 6 to 10 nano-meters with thermal annealing. The FS mediated the antiferromagnetic (AFM)-ferromagnetic (FM) interfacial coupling, leading to the temperature-dependent properties of the rods. FS were evident below 100 K, at which the NiO-AFM dominated the properties with a suppressed coercive field and non-saturated magnetization. At 100 K, however, the Ni-FM was superior to the NiO-AFM with a restored FM phase. Meanwhile, the interfacial magnetic frustration occurred due to the disappearance of FS. These two factors resulted in the coercivity enhancement at 100 K. The uniqueness of the structure opens opportunities to tailoring the properties of the rods by manipulating the core-shell inter-dependency, as well as inspiring further researches concerning its applications in spintronics. (C) 2012 American Institute of Physics. [ http://dx.doi.org/10.1063/1.3699039]
POLYMERIZABLE FULLERENE DERIVATIVE AND THEIR USE IN ORGANIC PHOTOVOLTAIC CELLS
(2012-03-15)
HSU CHAIN-SHU
;
CHENG YEN-JU
;
HSIEH CHAO-HSIANG
;
LI PEI-JUNG
The present invention discloses an inverted organic photovoltaic cell comprising a polymerizable fullerene interlayer adapted to enhance the device performance and lifetime. The polymerizable fullerene derivative comprises a fullerene core, a bridging functional group and a polymerizable functional group. The fullerene core can be either C60 or C70, and the bridging functional group comprises a cyclic hydrocarbon or a heterocyclic ring. The polymerizable functional group comprises a thermally polymerizable functional group or a photochemically polymerizable functional group.
Optical Simulation and Fabrication of Near-Ultraviolet LEDs on a Roughened Backside GaN Substrate
(2012-03-15)
Fu, Yi-Keng
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Lu, Yu-Hsuan
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Xuan, Rong
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Chao, Chia-Hsin
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Su, Yan-Kuin
In this letter, the numerical and experimental demonstrations for enhancement of light extraction efficiency in near-ultraviolet light-emitting diodes (LEDs) with a roughened backside on the N-face surface of GaN substrate through a chemical wet-etching process are investigated. It was also found that the increased etching time can increase the height of hexagonal pyramids and decrease the density of hexagonal pyramids. With 20-mA injection current, it was found that forward voltages were 3.13 and 3.16 V while output powers were 13.15 and 27.18 mW for the conventional LED and roughened backside LED, respectively.
Activity and expression profiling of matrix metalloproteinases (MMPs) and tissue inhibitors of matrix metalloproteinases (TIMPs) in the hearts with doxorubicin-induced cardiomyopathy
(2012-03-15)
Lin, C. S.
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Kuan, T-C.
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Lai, S-C.
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Chen, M-Y.
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Wu, H-T.
A regulatory element within the promoter of angiotensin-converting enzyme 2 (ace2) gene responsible for angiotensin II stimulation
(2012-03-15)
Kuan, T-C.
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Chen, M-C.
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Yang, T-H.
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Wu, W-T.
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Lin, C. S.
Curcumin and genistein inhibit TNF-alpha-inducted matrix metalloproteinase-9 (MMP-9) expression by repressing NF-kappa B-mediated transcription
(2012-03-15)
Wu, H-T
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Sie, S-S
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Chen, C-Y
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Kuan, T-C
;
Lin, C. S.
On the performances of IEEE 802.16(d) mesh CDS-mode networks using Single-Switched-Beam Antennas
(2012-03-16)
Lin, Chih-Che
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Wang, Shie-Yuan
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Hsu, Teng-Wei
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資訊工程學系
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Department of Computer Science
The IEEE 802.16(d) mesh coordinated distributed scheduling (CDS) mode is a novel technology for future fixed wireless backbone networks and designed for the use of omnidirectional antennas. The use of Single-Switched-Beam Antennas (SSBAs) may have great potential to increase network capacity due to the antenna directivity. However, a network designed for omnidirectional antennas usually cannot operate well or achieve good performance with the presence of antenna directivity. In this paper, we review the designs of the IEEE 802.16 mesh CDS-mode network, study the issues of this network with the use of Single-Switched-Beam Antennas (SSBAs), and propose a complete solution to solve these issues. The performances of our proposed scheme is evaluated using simulations. The simulation results show that our proposed scheme can effectively solve the issues of using SSBAs in the IEEE 802.16 mesh CDS-mode network and greatly increase its network capacity. (C) 2011 Elsevier B.V. All rights reserved.
可交聯之富勒烯衍生物及其反式結構有機太陽能電池
(2012-03-16)
許千樹
;
鄭彥如
;
謝朝翔
;
李佩蓉
本發明揭露一種可交聯之富勒烯衍生物及其反式結構有機太陽能電池。此可交聯之富勒烯衍生物包含有一富勒烯本體、一橋接官能基及一可交聯官能基。橋接官能基係接合於富勒烯本體與可交聯官能基之間。富勒烯本體可包含碳六十或碳七十之富勒烯，而橋接官能基可包含環烷類(cyclic hydrocarbon)或雜環(heterocyclic ring)基團。可交聯官能基則可包含一熱交聯官能基或一光交聯官能基。
一種氮化物半導體磊晶層的表面處理方法
(2012-03-16)
李威儀
;
徐瑩珈
;
葉彥顯
;
陳奎銘
本發明揭露一種氮化物半導體磊晶層的表面處理方法，在特定溫度和壓力的環境中，於氮化物半導體磊晶層上通入特定的蝕刻氣體，經過特定的時間，可於氮化物半導體磊晶層表面產生特定的形貌。本發明可直接在氮化物半導體之表面產生圖樣化結構，可大幅降低製造成本。
Structures of Helicobacter pylori Shikimate Kinase Reveal a Selective Inhibitor-Induced-Fit Mechanism
(2012-03-16)
Cheng, Wen-Chi
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Chen, Yen-Fu
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Wang, Hung-Jung
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Hsu, Kai-Cheng
;
Lin, Shuang-Chih
Shikimate kinase (SK), which catalyzes the specific phosphorylation of the 3-hydroxyl group of shikimic acid in the presence of ATP, is the enzyme in the fifth step of the shikimate pathway for biosynthesis of aromatic amino acids. This pathway is present in bacteria, fungi, and plants but absent in mammals and therefore represents an attractive target pathway for the development of new antimicrobial agents, herbicides, and antiparasitic agents. Here we investigated the detailed structure-activity relationship of SK from Helicobacter pylori (HpSK). Site-directed mutagenesis and isothermal titration calorimetry studies revealed critical conserved residues (D33, F48, R57, R116, and R132) that interact with shikimate and are therefore involved in catalysis. Crystal structures of HpSK center dot SO4, R57A, and HpSK center dot shikimate-3-phosphate center dot ADP show a characteristic three-layer architecture and a conformationally elastic region consisting of F48, R57, R116, and R132, occupied by shikimate. The structure of the inhibitor complex, E114A.162535, was also determined, which revealed a dramatic shift in the elastic LID region and resulted in conformational locking into a distinctive form. These results reveal considerable insight into the active-site chemistry of SKs and a selective inhibitor-induced-fit mechanism.
可注射性智慧凝膠及其製備方法
(2012-03-16)
劉典謨
;
蕭孟軒
;
林立傑
一種可注射性智慧凝膠及其製備方法，係對於改質後之幾丁聚醣，加入鹼性結構安定劑及稀釋溶液，而將幾丁聚醣溶液調整為偏中性，以接近人體之pH值，並可在低溫下形成可流動狀態的幾丁聚醣溶膠，當回到人體溫度則形成不可流動之幾丁聚醣凝膠，或者，利用於幾丁聚醣溶液中加入高分子電解液後再添加鈣離子或調成酸性溶液的方式，亦可將可流動狀態的幾丁聚醣溶膠轉為不可流動的幾丁聚醣凝膠，藉此製備而成的可注射性智慧凝膠不但具有可注射性，同時，可作為已載有藥物分子的磁敏性奈米膠囊之藥物載體凝膠，經由外加的磁場、電場及超音波等非接觸力的方式，控制其膠囊的破裂而釋放藥物至可注射性智慧凝膠中，再進行長時效及可階段性的藥物釋放，在生醫工程方面極具利用價值。