Browsing by Issue Date, starting with "2011-03-07"

Now showing 1 - 20 of 41976

Franck-Condon simulation of the A B-1(2) -> X (1)A(1) dispersed fluorescence spectrum of fluorobenzene and its rate of the internal conversion
(2011-03-07)
He, Rongxing
;
Yang, Ling
;
Zhu, Chaoyuan
;
Yamaki, Masahiro
;
Lee, Yuan-Pern
By using three different hybrid exchange-correlation functionals containing 20%, 35%, and 50% of exact Hartree-Fock (HF) exchange of the density functional theory and its time-dependent extension plus the Hartree-Fock and the configuration interaction of single excitation methods, equilibrium geometries, and their 30 vibrational-normal-mode frequencies of the ground S-0((1)A(1)) and the first excited S-1(B-1(2)) states of fluorobenzene (FB) were calculated. The dispersed fluorescence spectrum and internal conversion (IC) rate of the A B-1(2) -> X (1)A(1) transition were simulated by Franck-Condon (FC) calculations within the displaced harmonic oscillator approximation plus anharmonic and distorted corrections. The simulated spectral profile is primarily described by the Franck-Condon progression from the ring-breathing modes v(9) and v(10) which belong to totally symmetry modes. Anharmonic corrections simultaneously improve the intensity order of 9(1)(0) and 10(1)(0) bands and diminish 1(1)(0) transition that is fairly strong in harmonic simulations. It is concluded that the amount of Hartree-Fock exchange does impact the geometries and vibrational frequencies of FB molecule, but not the relative intensities of the transitions. It is anharmonic corrections that make the relative intensities of the transitions in good agreement with experimental results. Distorted corrections could assign most of the dominant overtones of out-of-plane nontotally symmetry modes, and the results agree well with the experimental assignments. Furthermore, it was found that the internal conversion rate is dominated by three promoting modes that are computed with lowing symmetry to C-1. By choosing dephasing width as 10 cm(-1) that is consistent with spectral simulation, we obtained the lifetimes of the A B-1(2) -> X (1)A(1) de-excitation as 11 and 19 ns, respectively, from TD(B3LYP) and HF/CIS calculations in comparison with the experimental value 14.75 ns. (c) 2011 American Institute of Physics. [doi:10.1063/1.3559454]
Dynamical properties of a nonequilibrium quantum dot close to a dissipative quantum phase transition
(2011-03-07)
Chung, Chung-Hou
;
電子物理學系
;
Department of Electrophysics
The dynamical decoherence rate and charge susceptibility of a nonequilibrium quantum dot close to a dissipative quantum phase transition are calculated. The setup concerns a resonance-level quantum dot coupled to two spinless fermionic baths with a finite bias voltage and an ohmic bosonic bath representing a dissipative environment. The system is equivalent to an anisotropic Kondo model. As dissipation strength increases, the system at zero temperature and zero bias exhibits a quantum phase transition of the Kosterlitz-Thouless (KT) type between a conducting delocalized phase and an insulating localized phase. Within the nonequilibrium frequency-dependent renormalization group (RG) approach, the finite bias crossover in dynamical decoherence rate and charge susceptibility close to the transition are addressed. The dynamical decoherence rate is found to increase with increasing frequency. In the delocalized phase, it shows a singularity at frequencies equal to positive or negative bias voltage. As the system cross overs to the localized phase, the decoherence rate at low frequencies gets progressively smaller and the singular feature is gradually smeared out, leading to a single linear frequency dependence. The dynamical charge susceptibility at low frequencies shows a dip-to-peak crossover across the transition. Relevance of these results to the experiments is discussed.
Franck-Condon simulation of the A (1)B(2) -> X (1)A(1) dispersed fluorescence spectrum of fluorobenzene and its rate of the internal conversion
(2011-03-07)
He, Rongxing
;
Yang, Ling
;
Zhu, Chaoyuan
;
Yamaki, Masahiro
;
Lee, Yuan-Pern
By using three different hybrid exchange-correlation functionals containing 20%, 35%, and 50% of exact Hartree-Fock (HF) exchange of the density functional theory and its time-dependent extension plus the Hartree-Fock and the configuration interaction of single excitation methods, equilibrium geometries, and their 30 vibrational-normal-mode frequencies of the ground S(0)((1)A(1)) and the first excited S(1)((1)B(2)) states of fluorobenzene (FB) were calculated. The dispersed fluorescence spectrum and internal conversion (IC) rate of the A (1)B(2) -> X (1)A(1) transition were simulated by Franck-Condon (FC) calculations within the displaced harmonic oscillator approximation plus anharmonic and distorted corrections. The simulated spectral profile is primarily described by the Franck-Condon progression from the ring-breathing modes v(9) and v(10) which belong to totally symmetry modes. Anharmonic corrections simultaneously improve the intensity order of 9(1)(0) and 10(1)(0) bands and diminish 1(1)(0) transition that is fairly strong in harmonic simulations. It is concluded that the amount of Hartree-Fock exchange does impact the geometries and vibrational frequencies of FB molecule, but not the relative intensities of the transitions. It is anharmonic corrections that make the relative intensities of the transitions in good agreement with experimental results. Distorted corrections could assign most of the dominant overtones of out-of-plane nontotally symmetry modes, and the results agree well with the experimental assignments. Furthermore, it was found that the internal conversion rate is dominated by three promoting modes that are computed with lowing symmetry to C(1). By choosing dephasing width as 10 cm(-1) that is consistent with spectral simulation, we obtained the lifetimes of the A (1)B(2) -> X (1)A(1) de-excitation as 11 and 19 ns, respectively, from TD(B3LYP) and HF/CIS calculations in comparison with the experimental value 14.75 ns. (c) 2011 American Institute of Physics. [doi:10.1063/1.3559454]
Evolution of RESET current and filament morphology in low-power HfO(2) unipolar resistive switching memory
(2011-03-07)
Hou, Tuo-Hung
;
Lin, Kuan-Liang
;
Shieh, Jiann
;
Lin, Jun-Hung
;
Chou, Cheng-Tung
Reduction in RESET current is crucial for future high-density resistive-switching memory. We have reported a unipolar-switching Ni/HfO(2)/Si structure with low RESET current of 50 mu A and RESET power of 30 mu W. In addition, a unique cycling evolution of RESET current across more than two orders of magnitude allows us to probe into the evolvement of filament morphology at nanoscale, using a simple yet quantitative model. Filament morphology was found to depend strongly on the charge-dissipation current proportional to the powers of SET voltage. Moreover, the formation of inactive semiconductive filaments plays an important role in the reduction in RESET current. (C) 2011 American Institute of Physics. [doi:10.1063/1.3565239]
Evolution of RESET current and filament morphology in low-power HfO2 unipolar resistive switching memory
(2011-03-07)
Hou, Tuo-Hung
;
Lin, Kuan-Liang
;
Shieh, Jiann
;
Lin, Jun-Hung
;
Chou, Cheng-Tung
Reduction in RESET current is crucial for future high-density resistive-switching memory. We have reported a unipolar-switching Ni/HfO2/Si structure with low RESET current of 50 mu A and RESET power of 30 mu W. In addition, a unique cycling evolution of RESET current across more than two orders of magnitude allows us to probe into the evolvement of filament morphology at nanoscale, using a simple yet quantitative model. Filament morphology was found to depend strongly on the charge-dissipation current proportional to the powers of SET voltage. Moreover, the formation of inactive semiconductive filaments plays an important role in the reduction in RESET current. (C) 2011 American Institute of Physics. [doi:10.1063/1.3565239]
Infrared absorption of CH3OSO detected with time-resolved Fourier-transform spectroscopy
(2011-03-07)
Chen, Jin-Dah
;
Lee, Yuan-Pern
;
應用化學系
;
應用化學系分子科學碩博班
;
Department of Applied Chemistry
A step-scan Fourier-transform spectrometer coupled with a multipass absorption cell was employed to detect temporally resolved infrared absorption spectra of CH3OSO produced upon irradiation of a flowing gaseous mixture of CH3OS(O)Cl in N-2 or CO2 at 248 nm. Two intense transient features with origins near 1152 and 994 cm(-1) are assigned to syn-CH3OSO; the former is attributed to overlapping bands at 1154 +/- 3 and 1151 +/- 3 cm(-1), assigned to the S=O stretching mixed with CH3 rocking (nu(8)) and the S=O stretching mixed with CH3 wagging (nu(9)) modes, respectively, and the latter to the C-O stretching (nu(10)) mode at 994 +/- 6 cm(-1). Two weak bands at 2991 +/- 6 and 2956 +/- 3 cm(-1) are assigned as the CH3 antisymmetric stretching (nu(2)) and symmetric stretching (nu(3)) modes, respectively. Observed vibrational transition wavenumbers agree satisfactorily with those predicted with quantum-chemical calculations at level B3P86/aug-cc-pVTZ. Based on rotational parameters predicted at that level, the simulated rotational contours of these bands agree satisfactorily with experimental results. The simulation indicates that the S=O stretching mode of anti-CH3OSO near 1164 cm(-1) likely makes a small contribution to the observed band near 1152 cm(-1). A simple kinetic model of self-reaction is employed to account for the decay of CH3OSO and yields a second-order rate coefficient k =(4 +/- 2) x 10(-10) cm(3) molecule(-1) s(-1). (C) 2011 American Institute of Physics. [doi: 10.1063/1.3556817]
Infrared absorption of CH(3)OSO detected with time-resolved Fourier-transform spectroscopy
(2011-03-07)
Chen, Jin-Dah
;
Lee, Yuan-Pern
;
應用化學系
;
應用化學系分子科學碩博班
;
Department of Applied Chemistry
A step-scan Fourier-transform spectrometer coupled with a multipass absorption cell was employed to detect temporally resolved infrared absorption spectra of CH(3)OSO produced upon irradiation of a flowing gaseous mixture of CH(3)OS(O)Cl in N(2) or CO(2) at 248 nm. Two intense transient features with origins near 1152 and 994 cm(-1) are assigned to syn-CH(3)OSO; the former is attributed to overlapping bands at 1154 +/- 3 and 1151 +/- 3 cm(-1), assigned to the S=O stretching mixed with CH(3) rocking (nu(8)) and the S=O stretching mixed with CH(3) wagging (nu(9)) modes, respectively, and the latter to the C-O stretching (nu(10)) mode at 994 +/- 6 cm(-1). Two weak bands at 2991 +/- 6 and 2956 +/- 3 cm(-1) are assigned as the CH(3) antisymmetric stretching (nu(2)) and symmetric stretching (nu(3)) modes, respectively. Observed vibrational transition wavenumbers agree satisfactorily with those predicted with quantum-chemical calculations at level B3P86/aug-cc-pVTZ. Based on rotational parameters predicted at that level, the simulated rotational contours of these bands agree satisfactorily with experimental results. The simulation indicates that the S=O stretching mode of anti-CH(3)OSO near 1164 cm(-1) likely makes a small contribution to the observed band near 1152 cm(-1). A simple kinetic model of self-reaction is employed to account for the decay of CH(3)OSO and yields a second-order rate coefficient k =(4 +/- 2) x 10(-10) cm(3) molecule(-1) s(-1). (C) 2011 American Institute of Physics. [doi: 10.1063/1.3556817]
交大e-News第089期
(2011-03-07)
Secretariat
;
國立交通大學秘書室
Butterfly match-line structure and search method implemented thereby
(2011-03-08)
Huang
;
Po-Tsang
;
Hwang
;
Wei
;
Chang
The present invention discloses a butterfly match-line structure and a search method implemented thereby, wherein the parallelism of the match lines is increased to shorten the search time, and a butterfly-type connection is used to reduce the power consumption and achieve the best energy efficiency. Via the butterfly-type connection, information can be reciprocally transmitted between the parallel match lines, which are independent originally. When a miss case occurs, more succeeding memory cells will not be compared but will be turned off. Thereby, the power consumption is reduced. Further, XOR-based conditional keepers are used to reduce the matching time and the power consumption. Besides, such a circuit is also used to shorten the delay time of the butterfly-type connection.
眾神的微笑：芥川龍之介的《羅生門》與《煙草和魔鬼》
(2011-03-09)
賴振南
;
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。
GaN HEMT with Nitrogen-Rich Tungsten Nitride Schottky Gate and Method of Forming the Same
(2011-03-10)
Chang, Edward Yi
;
Lu, Chung-Yu
A GaN HEMT with Schottky gate is disclosed. The GaN HEMT sequentially has a GaN layer, an AlGaN layer, and a Schottky gate on a substrate, and a source and a drain on two sides of the Schottky gate. The Schottky gate is made by a material of nitrogen-rich tungsten nitride, which has a nitrogen content of about 0.5 molar ratio.
Wetted wall venturi scrubber with a 2-stage venturi throat
(2011-03-10)
Tsai, Chuen-Jinn
A venturi scrubber which avoids clogging in the throat by dust particles is developed. The scrubber includes a venturi tube, two scrubbing fluid conduits and a storage tank. The venturi tube has a converging section, a diverging section and a throat section which is connected between the converging section and the diverging section. The scrubbing fluid conduit has a top end connected with the bottom end of the converging section of the venturi tube, and a bottom end extending into the storage tank. Thereby, scrubbing fluid can be guided directly into the storage tank without passing through the throat section. As a result, the clogging of dust particles on the converging section of the venturi throat can be minimized and the abnormal increase in the pressure drop of the air flow through the throat can also be avoided.
Flexible Drug Delivery Chip, its Fabrication Method and Uses Thereof
(2011-03-10)
Chen, San-Yuan
;
Huang, Wei-Chen
;
Liu, Dean-Mo
Nanodevice and method for in vivo monitoring and release of drugs are provided. The disclosed nanodevice is characterized in having a drug-loaded nanosphere that is capable of releasing the encapsulated drugs upon magnetically stimulation. The nanodevice may also be used as a contrast agent for in vivo imaging and monitoring the concentration and distribution of the released drugs and/or active compounds injected separately into a target site of a subject.
METHOD FOR FABRICATING NANOSCALE THERMOELECTRIC DEVICE
(2011-03-10)
CHAO, Chuen-Guang
;
Chen, Jung-Hsuan
;
Yang, Ta-Wei
The present invention discloses a method for fabricating a nanoscale thermoelectric device, which comprises steps: providing at least one template having a group of nanoscale pores; forming a substrate on the bottom of the template; injecting a molten semiconductor material into the nanoscale pores to form a group of semiconductor nanoscale wires; removing the substrate to obtain a semiconductor nanoscale wire array; and using metallic conductors to cascade at least two semiconductor nanoscale wire arrays to form a thermoelectric device having a higher thermoelectric conversion efficiency.
PLANAR ANTENNA AND ELECTROMAGNETIC BAND GAP STRUCTURE THEREOF
(2011-03-10)
CHUNG, Shyh-Jong
;
LING, Ching-Wei
;
YANG, Tzu-Hsien
An electromagnetic band-gap structure includes a circuit board, a ground plane and a plurality of electromagnetic band-gap units. The circuit board includes a first side and a second surface, and the ground plane disposed on the first side. The plurality of electromagnetic band-gap units are located on both the first surface and the second surface and connected to each other along an edge of the ground plane. Every electromagnetic band-gap unit includes a first strip line, a second strip line and a via. The first strip line is located on the first side, including a first relative long strip line and a first relative short strip line connected to the ground. The second strip line is located on the second side. The second strip line is connected to the first strip line of the adjacent electromagnetic band-gap unit through the via.
Wet electrostatic precipitator with pulse jet for cleaning discharge wires
(2011-03-10)
Tsai, Chuen-Jinn
;
Lin, Guan-Yu
A wet electrostatic precipitator (ESP) is disclosed to have a housing, several discharge wires, two roughened collection electrodes coated with TiO2 or SiO2 nanoparticles, two porous metallic plates, and two roughened glass plates coated with TiO2 or SiO2 nanoparticles. The porous metallic plates and the glass plates coated with TiO2 or SiO2 nanoparticles located above the collection electrodes are used to enhance the uniformity of the water film. When particles are introduced into the ESP, they are charged by gas ions generated by corona discharge, and then migrate to collection electrodes due to electrostatic force. Finally, particles are removed by uniform water film flowing downward along the collection electrodes. Furthermore, pulse jet passing through the small holes on the collection plates is used to clean discharge wires, maintaining electric corona strength and prolonging the operation life.
Dielectrophoresis-based microfluidic system
(2011-03-10)
Fan, Shih-Kang
A dielectrophoresis-based microfluidic system includes a first electrode plate, a second electrode plate and a spacing structure. The first electrode plate comprises a first substrate and an electrode layer disposed on one side surface of the first substrate. The second electrode plate comprises a second substrate and a plurality of electrodes. The electrodes are disposed on one side surface of the second substrate which is opposite to the electrode layer, and arranged in a microchannel pattern. The spacing structure is disposed between the first electrode plate and the second electrode plate so that a space is defined between the first electrode plate and the second electrode plate. Accordingly, users can inject microfluid into the space and apply voltage to different electrodes to drive the microfluid to flow towards different directions.
功率因數修正方法及其裝置
(2011-03-11)
陳鴻祺
一種應用於昇壓型轉換器之功率因數修正方法及其裝置。功率因數修正方法係先由回授輸入與輸出電壓，產生開關切換參考信號；再由轉換器回授之輸出電壓與電壓命令之電壓誤差，經電壓控制器取得相位位移量，進而利用相位位移器，平移此開關切換參考信號，決定出開關切換控制信號，再經由比較器比較開關切換控制信號與三角波信號，產生最終開關切換信號，進而調整輸入電流波形跟隨電壓波形，以修正功率因數。應用此方法之功率因數控制器僅用單一電壓迴路，無須回授電流，即可修飾電流波形，大大簡化電路的複雜度。
乘法器進位位元之估計方法與裝置
(2011-03-11)
廖彥欽
;
張錫嘉
本發明提供一種低誤差縮減寬度乘法器之設計，其係根據乘法器之輸入數值來動態補償誤差，且同時提供動態補償值分析與產生方式，使不同類型之乘法器可針對乘法器之輸入信號之統計特性來選擇最適當之補償值。
檢測複製影像資料之視訊編碼方法
(2011-03-11)
史彥
;
張添烜
本發明係揭示一種檢測複製影像資料之視訊編碼方法。藉由似然率檢定預先決策複製影像資料及編碼過程可否終止，因此可摒除視訊編碼裝置之位移估測與位移補償等冗餘運算。實施例中，區塊複製似然率由編碼區塊及預測位移對應之預測區塊計算；為限制誤檢率以維持編碼率－失真表現，決策臨界由預測及檢測統計量動態的調整。