Browsing by Issue Date, starting with "2010-11-05"

Now showing 1 - 20 of 44769

Domain Wall Conductivity in La-Doped BiFeO(3)
(2010-11-05)
Seidel, J.
;
Maksymovych, P.
;
Batra, Y.
;
Katan, A.
;
Yang, S. -Y.
The transport physics of domain wall conductivity in La-doped bismuth ferrite (BiFeO(3)) has been probed using variable temperature conducting atomic force microscopy and piezoresponse force microscopy in samples with arrays of domain walls in the as-grown state. Nanoscale current measurements are investigated as a function of bias and temperature and are shown to be consistent with distinct electronic properties at the domain walls leading to changes in the observed local conductivity. Our observation is well described within a band picture of the observed electronic conduction. Finally, we demonstrate an additional degree of control of the wall conductivity through chemical doping with oxygen vacancies, thus influencing the local conductive state.
Flavor transition mechanisms of propagating astrophysical neutrinos: A model independent parametrization
(2010-11-05)
Lai, Kwang-Chang
;
Lin, Guey-Lin
;
Liu, T. C.
;
物理研究所
;
Institute of Physics
One of the important goals for future neutrino telescopes is to identify the flavors of astrophysical neutrinos and therefore determine the flavor ratio. The flavor ratio of astrophysical neutrinos observed on the Earth depends on both the initial flavor ratio at the source and flavor transitions taking place during propagations of these neutrinos. We propose a model independent parametrization for describing the above flavor transitions. A few flavor transition models are employed to test our parametrization. The observational test for flavor transition mechanisms through our parametrization is discussed.
交大e-News第082期
(2010-11-05)
Secretariat
;
國立交通大學秘書室
Regioselective One-Pot Protection of D-Glucosamine
(2010-11-05)
Chang, Ken-Lien
;
Zulueta, Medel Manuel L.
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Lu, Xin-An
;
Zhong, Yong-Qing
;
Hung, Shang-Cheng
A highly regioselective one-pot transformation of 2-azido2-deoxy-1,3,4,6-tetra-O-trimethylsilyl-D-glucopyranose via sequential additions of various reagents was systematically studied, yielding the fully protected derivatives and the 1-, 3-, 4-, as well as 6-alcohols, respectively.
Domain Wall Conductivity in La-Doped BiFeO3
(2010-11-05)
Seidel, J.
;
Maksymovych, P.
;
Batra, Y.
;
Katan, A.
;
Yang, S. -Y.
The transport physics of domain wall conductivity in La-doped bismuth ferrite (BiFeO3) has been probed using variable temperature conducting atomic force microscopy and piezoresponse force microscopy in samples with arrays of domain walls in the as-grown state. Nanoscale current measurements are investigated as a function of bias and temperature and are shown to be consistent with distinct electronic properties at the domain walls leading to changes in the observed local conductivity. Our observation is well described within a band picture of the observed electronic conduction. Finally, we demonstrate an additional degree of control of the wall conductivity through chemical doping with oxygen vacancies, thus influencing the local conductive state.
Strong coupling of different cavity modes in photonic molecules formed by two adjacent microdisk microcavities
(2010-11-08)
Lin, Hsuan
;
Chen, Jhih-Hao
;
Chao, Shih-Shing
;
Lo, Ming-Cheng
;
Lin, Sheng-Di
Strong couplings between cavity modes in photonic molecules formed by two preselected nearly identical microdisk microcavities with embedded quantum dots are investigated. By continuously tuning the refractive index of one microdisk, clear anticrossings in the resonant peak energies associated with crossings in the peak linewidths can be observed. The coupling strengths are extracted by the coupled mode theory and analyzed by the model considering the effective potential confining the electromagnetic waves in the microcavities. (C) 2010 Optical Society of America
Strong coupling of different cavity modes in photonic molecules formed by two adjacent microdisk microcavities
(2010-11-08)
Lin, Hsuan
;
Chen, Jhih-Hao
;
Chao, Shih-Shing
;
Lo, Ming-Cheng
;
Lin, Sheng-Di
Strong couplings between cavity modes in photonic molecules formed by two preselected nearly identical microdisk microcavities with embedded quantum dots are investigated. By continuously tuning the refractive index of one microdisk, clear anticrossings in the resonant peak energies associated with crossings in the peak linewidths can be observed. The coupling strengths are extracted by the coupled mode theory and analyzed by the model considering the effective potential confining the electromagnetic waves in the microcavities. (C) 2010 Optical Society of America
Structure of high electron mobility transistor, a device comprising the structure and a method of producing the same
(2010-11-09)
Chang
;
Edward Yi.
;
Wu
;
Yun-Chi
;
Lin
Disclosed herein are a structure of a metal oxide semiconductor pseudomorphic high electron mobility transistor (MOS-PHEMT) suitable for use in a semiconductor device, such as a single-pole-double-throw (SPDT) switch of a monolithic microwave integrated circuit (MMIC); and a method of producing the same. The MOS-PHEMT structure is characterized in having a gate dielectric layer formed by atomic deposition from a gate dielectric selected from the group consisting of Al2O3, HfO2, La2O3, and ZrO2, and thereby rendering the semiconductor structure comprising the same, such as a high frequency switch device, to have less DC power loss, less insertion loss and better isolation.
DISPLACEMENT MEASUREMENT SYSTEM AND METHOD THEREOF
(2010-11-11)
Hsu, Kuei-Chu
;
Chen, Chii-Chang
;
Chan, Chia-Hua
;
Lai, Yin-Chieh
A displacement measurement system including a coherent light source, a two-dimensional grating, a photo sensor, and a signal processing apparatus is provided. After the coherent light beam enters the two-dimensional grating, a zero-order light beam and a plurality of first-order diffraction beams are generated. The zero-order light beam interferes with two of the first-order beams in different directions, so that corresponding interference fringes are formed on the photo sensor. Accordingly, when the two-dimensional grating moves, displacements of the two-dimensional grating in the different directions are obtained by calculating phase differences of the interference fringes in the corresponding directions. Besides, when the two-dimensional grating rotates, the rotational angle of the two-dimensional grating is obtained from the corresponding rotational angle of a diffraction pattern of the first-order diffraction beams.
PRINT DIPOLE ANTENNA AND MANUFACTURING METHOD THEREOF
(2010-11-11)
Cheng, Li-Yuan
;
Chen, Fu-Chiarng
The present invention discloses a print dipole antenna and manufacturing method thereof. The print dipole antenna has a plurality of resonance frequencies, which comprises a substrate, a ring microstrip line and a ground plane. The ring microstrip line is disposed on one side of the substrate, and the interior of the ring microstrip line is symmetrically disposed with a plurality of parasitic metals. The ground plane is disposed on the other side of the substrate, and has a hollow portion corresponding to the central area of the ring microstrip line. The ring microstrip line has a plurality of end ports including input end ports and output end ports, which may further comprise an open circuit end. The plurality of parasitic metals may be of linear shape or bended in arbitrarily windings. A normal mode signal is fed from the end points of the plurality of parasitic metals.
TRI-FREQUENCY DUPLEXER CIRCUIT AND MULTI-FREQUENCY DUPLEXER CIRCUIT
(2010-11-11)
Chen, Fu-Chiarng
;
Wang, Shi-Yung
The present invention discloses a tri-frequency duplexer circuit and multi-frequency duplexer circuit. The tri-frequency duplexer circuit comprises a microstrip line circuit, two first mushrooms, two second mushrooms and two third mushrooms. The microstrip line circuit comprises a first Input/Output (I/O) port, a second I/O port, a third I/O port and a fourth I/O port. The two first mushrooms are respectively disposed at transmission line paths between the first I/O port and the second I/O port and between the first I/O port and the third I/O port. The two second mushrooms are respectively disposed at transmission line paths between the first I/O port and the second I/O port and between the first I/O port and the fourth I/O port. The two third mushrooms are respectively disposed at transmission line paths between the first I/O port and the third I/O port and between the first I/O port and the fourth I/O port.
Controlling radial fingering patterns in miscible confined flows
(2010-11-11)
Chen, Ching-Yao
;
Huang, C. -W.
;
Wang, L. -C.
;
Miranda, Jose A.
;
機械工程學系
Injection-driven immiscible flow in radial Hele-Shaw cells results in highly ramified patterns if the injection rate is constant in time. Likewise, time-dependent gap immiscible flow in lifting Hele-Shaw cells leads to intricate morphologies if the cell's gap width grows exponentially with time. Recent studies show that the rising of these complex fingered structures can be controlled by properly adjusting the injection rate, and the time-dependent gap width. We investigate the effectiveness of these control strategies assuming that the fluids involved are miscible. Despite the absence of surface tension effects, intensive numerical simulations support the stabilizing role of these controlling protocols. Splitting, merging and competition of fingers are all inhibited. The sensitivity of the system to changes in the initial conditions and Peclet numbers is also discussed.
Controlling radial fingering patterns in miscible confined flows
(2010-11-11)
Chen, Ching-Yao
;
Huang, C. -W.
;
Wang, L. -C.
;
Miranda, Jose A.
;
機械工程學系
Injection-driven immiscible flow in radial Hele-Shaw cells results in highly ramified patterns if the injection rate is constant in time. Likewise, time-dependent gap immiscible flow in lifting Hele-Shaw cells leads to intricate morphologies if the cell's gap width grows exponentially with time. Recent studies show that the rising of these complex fingered structures can be controlled by properly adjusting the injection rate, and the time-dependent gap width. We investigate the effectiveness of these control strategies assuming that the fluids involved are miscible. Despite the absence of surface tension effects, intensive numerical simulations support the stabilizing role of these controlling protocols. Splitting, merging and competition of fingers are all inhibited. The sensitivity of the system to changes in the initial conditions and Peclet numbers is also discussed.
BIOMEDICAL SENSOR DEVICE
(2010-11-11)
Chen, Yu-Han
;
Liao, Lun-De
;
Chao, Paul C.-P.
;
Lin, C.T.
A biomedical sensor device includes a light source, a probe array, and a photo detector. The light source is configured for emitting infrared radiation. The probe array is contacted to a user's skin to detect an electric wave signal transmitted through the probe array from the skin. The probe array includes a substrate and a plurality of probes mounted on the substrate, wherein the substrate and the probes are non-opaque so that the infrared radiation may be transmitted through the probe array into the skin. The photo detector is configured to detect an infrared signal by measuring the infrared radiation absorption by the skin.
ORGANIC PHOTOSENSITIVE OPTOELECTRONIC DEVICE
(2010-11-11)
Meng, Hsin- Fei
;
Hong, Sheng-Fu
;
Tseng, Hsin-Rong
;
Chen, En-Chen
;
Chu, Chia-Hung
An organic photosensitive optoelectronic device includes an anode, an organic photosensitive layer formed on the anode and having a donor portion and an acceptor portion, a hole blocking layer formed on the organic photosensitive layer so as for the organic photosensitive layer to be sandwiched between the anode and the hole blocking layer, and a cathode formed on the hole blocking layer so as for the hole blocking layer to be sandwiched between the cathode and the organic photosensitive layer. The highest occupied molecular orbitals (HOMO) of the hole blocking layer is at least 0.3 eV higher than that of the donor portion. Therefore, the optoelectronic device efficiently suppresses dark current so as to enhance sensitivity when applied to a detector.
One-dimensional germanium nanostructures-formation and their electron field emission properties
(2010-11-12)
Wu, Hung-Chi
;
Hou, Te-Chien
;
Chueh, Yu-Lun
;
Chen, Lih-Juann
;
Chiu, Hsin-Tien
Ge nanostructures were synthesized by reduction of GeO(2) in H(2) atmosphere at various temperatures. Entangled and straight Ge nanowires with oxide shells were grown at high temperatures. Ge nanowires with various numbers of nodules were obtained at low temperatures. Ge nanowires without nodules exhibited remarkable field emission properties with a turn-on field of 4.6 V mu m(-1) and field enhancement factor of 1242.
One-dimensional germanium nanostructures-formation and their electron field emission properties
(2010-11-12)
Wu, Hung-Chi
;
Hou, Te-Chien
;
Chueh, Yu-Lun
;
Chen, Lih-Juann
;
Chiu, Hsin-Tien
Ge nanostructures were synthesized by reduction of GeO(2) in H(2) atmosphere at various temperatures. Entangled and straight Ge nanowires with oxide shells were grown at high temperatures. Ge nanowires with various numbers of nodules were obtained at low temperatures. Ge nanowires without nodules exhibited remarkable field emission properties with a turn-on field of 4.6 V mu m(-1) and field enhancement factor of 1242.
海莉令人沉醉的純淨之最
(2010-11-14)
彭婉婷
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Department of Communication and Technology
;
傳播與科技學系
盛大的高雄世運開幕夜，海莉．迪．薇思特拉（Hayley Dee Westenra）展現她天籟般的嗓音，以清晰的中文咬字唱出「月亮代表我的心」。悅耳歌聲加上清麗的形象，令全場與收看轉播的上千萬觀眾為之傾倒；海莉無瑕嗓音以及現場演出的魅力，已然成為各大典禮的焦點，今年更獲邀上海世博閉幕獻唱，台灣也於2010年十月，成為海莉亞洲首演的第一站。
反國光創意遊行救台灣
(2010-11-14)
李庭蕙
;
Department of Communication and Technology
;
傳播與科技學系
「反國光，救台灣」11月13日，位在台北鬧區百貨廣場前，聚集近萬名的民眾，表達對八輕國光石化開發案的不滿。石化工業是個高耗能、高排碳的產業，政府提出的開發案完全與節能減碳理念背道而馳，加上六輕工業區頻頻出包，嚴重影響雲林麥寮鄉的農田與養殖業。因此，這次遊行以保護濕地環境、反對興建國光石化為主要訴求，透過遊行，讓政府看見彰、雲地區的民眾與環保團體驅逐八輕廠的信念。
《特攻聯盟》正義的正意
(2010-11-14)
陳俐吟
;
Department of Communication and Technology
;
傳播與科技學系
每個人都看過英雄電影，每個人都做過英雄夢，無論拯救世界於水深火熱之中，或是保護自己深愛的人，人們總是嚮往一種屬於正義的浪漫，《特攻聯盟》就是這麼開始的。