Browsing by Issue Date, starting with "2010-08-16"

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具有非極性三族－氮化物層的多層結構及其製法
(2010-08-16)
李威儀
;
陳振芳
;
江振豪
一種具有非極性三族-氮化物層的多層結構及其製法,包括在基板上形成複數成核層;以及於該成核層上形成非極性三族-氮化物層,其中,各該複數成核層係獨立選自下式(I)之氮化物:AxB1-xN (I) 式中,A和B係選自B、Al、Ga、IN或Tl之不相同的元素,且0≦x≦1。該複數成核層可有效減緩應力、減少晶格位差、阻擋差排延伸並降低差排密度,故可形成表面平坦且結晶品質佳之三族-氮化物層。
三維微結構之組裝方法
(2010-08-16)
邱一
;
黃煒智
;
吳昌修
本發明揭示一種只需一推即可完成組裝的三維微結構之組裝方法，包括提供具有下凹的一容置空間的基底層，在基底層上設置具有一組裝推墊及至少一旋轉軸的豎立元件，在豎立元件上設置固定裝置，此固定裝置包括至少一鉸鏈固定元件，橫置於旋轉軸上。最後，推動組裝推墊使旋轉軸旋轉，至組裝推墊完全沒入容置空間，豎立元件即完成豎立，本發明並提出一種似V懸臂之鉸鏈固定元件使旋轉軸旋轉時上下左右均不會晃動。本發明與電子封裝製程相容，因此組裝便於自動化，特別若有多個微結構陣列設置，亦可以自動化設備同時推動多個組裝推墊以完成組裝。
保護軟體內容之嵌入式保護裝置及其保護方法
(2010-08-16)
林進燈
;
吳孟哲
;
鍾仁峰
;
沈子貴
;
洪紹航
本發明係揭露一種保護軟體內容之嵌入式保護裝置及其保護方法，其係在一處理器執行嵌入式軟體，即韌體程式時執行授權檢查，此嵌入式保護裝置可接收韌體程式執行時所傳送之授權碼，藉以在內部連續產生一虛擬隨機亂數，之後再利用此亂數產生公、私鑰，對授權碼加密，並形成一加密資料，之後更可對此加密資料進行解密，並將結果傳回執行的處理器，以判斷是否可進行授權。若是，則執行此韌體程式，且重複上述的加密動作；若否，則無法執行此韌體程式。本發明係利用硬體執行加解密動作，進而使嵌入式韌體受到更好的安全保護機制。
Continuous wave operation of current injected GaN vertical cavity surface emitting lasers at room temperature
(2010-08-16)
Lu, Tien-Chang
;
Chen, Shih-Wei
;
Wu, Tzeng-Tsong
;
Tu, Po-Min
;
Chen, Chien-Kang
We report the demonstration of the continuous wave laser action on GaN-based vertical cavity surface emitting lasers at room temperature. The laser structure consists of a ten-pair Ta(2)O(5)/SiO(2) distributed Bragg reflector (DBR), a 7 lambda-thick optical cavity, ten-pairs InGaN/GaN multiquantum wells with an AlGaN electron blocking layer, and a 29-pair AlN/GaN DBR. The laser has a threshold current of about 9.7 mA corresponding to the current density of about 12.4 kA/cm(2) and a turn-on voltage about 4.3 V at 300 K. The lasing wavelength was 412 nm with a linewidth of about 0.5 nm. A spontaneous emission coupling efficiency factor of about 5x10(-3) and the degree of polarization of about 55% were measured, respectively. The laser beam has a narrow divergence angle of about 8 degrees. (C) 2010 American Institute of Physics. [doi:10.1063/1.3483133]
串流影音資料傳輸控制方法及其架構
(2010-08-16)
黃經堯
;
陳志展
;
李純孝
本發明提供一種串流影音資料傳輸控制方法及其架構,其利用傳輸端一回報傳輸速率改善接收端播放延遲的情況。回報傳輸速率係依據前週期傳輸暫存器之資料剩餘量以及實際傳輸速率而定。而實際傳輸速率則為需求傳輸速率與可用傳輸速率之較小者,其中需求傳輸速率係依據資料剩餘量及回報傳輸速率決定。因此,回報傳輸速率可隨著資料剩餘量的累積而調整,有效改善發生播放延遲的情況。
Suppression of Octahedral Tilts and Associated Changes in Electronic Properties at Epitaxial Oxide Heterostructure Interfaces
(2010-08-19)
Borisevich, A. Y.
;
Chang, H. J.
;
Huijben, M.
;
Oxley, M. P.
;
Okamoto, S.
Epitaxial oxide interfaces with broken translational symmetry have emerged as a central paradigm behind the novel behaviors of oxide superlattices. Here, we use scanning transmission electron microscopy to demonstrate a direct, quantitative unit-cell-by-unit-cell mapping of lattice parameters and oxygen octahedral rotations across the BiFeO(3)-La(0.7)Sr(0.3)MnO(3) interface to elucidate how the change of crystal symmetry is accommodated. Combined with low-loss electron energy loss spectroscopy imaging, we demonstrate a mesoscopic antiferrodistortive phase transition near the interface in BiFeO(3) and elucidate associated changes in electronic properties in a thin layer directly adjacent to the interface.
Self-assembly of an A-B diblock copolymer blended with a C homopolymer and a C-D diblock copolymer through hydrogen bonding interaction
(2010-08-19)
Chen, Wan-Chun
;
Kuo, Shiao-Wei
;
Chang, Feng-Chih
;
應用化學系
;
Department of Applied Chemistry
In this study, we investigated the miscibility, phase behavior, and self-assembled nanostructures formed from the immiscible crystalline-amorphous diblock copolymer poly(epsilon-caprolactone-b-4-vinyl pyridine) (PCL-b-P4VP, A-B) when blended with the homopolymer poly(vinyl phenol) (PVPh, C) and the diblock copolymer poly(vinyl phenol-b-styrene) (PVPh-b-PS, C-D). Long-range-ordered microphase separation was difficult to achieve in the PCL-b-P4VP/PVPh (A-B/C) blend system because PVPh interacted with both the P4VP and PCL blocks simultaneously through hydrogen bonding interactions. In contrast, we observed sharp, multiple orders of diffraction in the SAXS profiles of the PCL-b-P4VP/PVPh-b-PS (A-B/C D) blend system, indicating that perfect microphase separation occurred because the incorporation of the PS block induced the PVPh block to hydrogen bond preferentially with the P4VP block. This simple A-B/C-D (PCL-b-P4VP/PVPh-b-PS) diblock copolymer mixture exhibited self-assembly behavior (a three-lamella phase) similar to that of a corresponding ABC triblock copolymer. (C) 2010 Elsevier Ltd. All rights reserved.
Effects of sputtering pressure and Al buffer layer thickness on properties of AZO films grown by rf magnetron sputtering
(2010-08-20)
Tseng, C. H.
;
Wang, W. H.
;
Chang, H. C.
;
Chou, C. P.
;
Hsu, C. Y.
Transparent and conductive Al-doped (2 wt.%) zinc oxide (AZO) films were deposited on inexpensive soda-lime glass substrates by using rf magnetron sputtering at room temperature. This study analyzed the effects of argon sputtering pressure, which varied in the range from 0.46 to 2.0 Pa, on the morphological, electrical and optical properties of AZO films. The only (0 0 2) diffraction peak of the film were observed at 20 similar to 34.45 degrees, exhibiting that the AZO films had hexagonal ZnO wurtzite structure, and a preferred orientation with the c-axis perpendicular to the substrate. By applying a very thin aluminum buffer layer with the thickness of 2 nm, findings show that the electrical resistivity was 9.46 x 10(-4) Omega-cm, and the average optical transmittance in the visible part of the spectra was approximately 81%. Furthermore, as for 10 nm thick buffer layer, the electrical resistivity was lower, but the transmittance was decreased. (C) 2010 Elsevier Ltd. All rights reserved.
資料搜尋方法及其數值資料編碼方法
(2010-08-21)
鄭哲聖
;
單智君
;
鍾崇斌
本發明係揭露一種資料搜尋方法及其數值資料編碼方法，此方法將已排序之複數個數值分成複數個群組，每一群組之第一個數值係代表為跳躍點，而其他數值係代表為內部點，接著，使用一第一編碼演譯程序對該些群組之跳躍點進行編碼，以產生複數個跳躍點編碼值，並使用一空間預估程序，預估此些內部點以一第二編碼演譯程序進行編碼時所需之位元保留空間，繼之，根據該第二編碼演譯程序對該些群組之該些內部點進行編碼，以產生複數個內部點編碼值。最後，根據群組之排列順序及位元保留空間，將跳躍點編碼值及內部點編碼值依序排列，以產生一輸出編碼資料。
消除正交分頻多工系統中因通道時變產生載波間干擾的方法
(2010-08-21)
吳文榕
;
許兆元
正交分頻多工(OFDM)系統於高速移動的環境下，通道在一OFDM符元(symbol)內具有時變特性，此時變特性會造成載波間正交性喪失而互相干擾，降低系統效能，因此本發明即在提供一種消除正交分頻多工系統中因通道時變產生載波間干擾的方法，其係利用線性時變通道之干擾矩陣本身的特殊結構，配合牛頓疊代(iteration)法化簡反矩陣運算，並使用快速傅立葉轉換降低運算量，不需使用額外電路即可達到消除載波間干擾之目的。
Solid-phase thermodynamic interpretation of ion desorption in matrix-assisted laser desorption/ionization
(2010-08-22)
Lai, Yin Hung
;
Wang, Chia Chen
;
Lin, Sheng Hsian
;
Wang, Yi Sheng
;
Lee, Yuan Tseh
交大e-News第077期
(2010-08-23)
Secretariat
;
國立交通大學秘書室
High-gain complementary inverter with InGaZnO/pentacene hybrid ambipolar thin film transistors
(2010-08-23)
Liu, Po-Tsun
;
Chou, Yi-Teh
;
Teng, Li-Feng
;
Fuh, Chur-Shyang
;
光電工程學系
Ambipolar thin film transistors (TFTs) with InGaZnO/pentacene heterostructure channels are demonstrated for a high-voltage-gain complementary metal oxide semiconductor (CMOS) inverter. The ambipolar TFT exhibits a electron mobility of 23.8 cm(2)/V s and hole mobility of 0.15 cm(2)/V s for the InGaZnO and pentacene, respectively. The thermal annealing process was also studied to adjust electron concentration reducing operating voltage of the CMOS inverter. The voltage gain achieves as high as 60 obtained in the first and third quadrants of the voltage transfer characteristic. The high performance and simple manufacture of the heterostructure CMOS inverter show promise as critical components in various electrical applications. (C) 2010 American Institute of Physics. [doi:10.1063/1.3483616]
2-D modeling of dual-mode acoustic phonon excitation of a triangular nanoplate
(2010-08-23)
Tai, Po-Tse
;
Yu, Pyng
;
Tang, Jau
;
光電工程學系
;
Department of Photonics
In this theoretical work, we investigated coherent phonon excitation of a triangular nanoplate based on 2-D Fermi-Pasta-Ulam lattice model. Based on the two-temperature model commonly used in description of laser heating of metals, we considered two kinds of forces related to electronic and lattice stresses. Based on extensive simulation and analysis, we identified two major planar phonon modes, namely, a standing wave mode related to the triangle bisector and another mode corresponding to half of the side length. This work elucidates the roles of laser-induced electronic stress and lattice stress in controlling the initial phase and the amplitude ratio between these two phonon modes. (C) 2010 Elsevier B.V. All rights reserved.
Formation, Binding, and Stability of O-Ag-CO(2)-Ag-O Compounds on Ag(100) Investigated by Low Temperature Scanning Tunneling Microscopy and Manipulation
(2010-08-26)
Hsieh, Ming-Feng
;
Li, Hong-Doa
;
Lin, Deng-Sung
;
Morgenstern, Karina
;
物理研究所
The understanding of reaction intermediates in heterogeneous catalysis has important implications for the design of novel catalysts. We investigate the adsorption of CO(2) on oxygen precovered Ag(100) at low temperature (17 K) by scanning tunneling microscopy and inelastic electron tunneling manipulation at 5 K. On the terraces, the adsorption leads to O-Ag-CO(2)-Ag-O compounds with reduced binding of the oxygen to the surface as compared to the separately adsorbed molecules. The compound can be either dissociated into a bistable O-Ag-CO(2) compound at 1.6 V, dissociated into its constituents at 2.2 V, or reacted at 6.5 V into a species, which we tentatively attribute to CO(3). The thus obtained carbon trioxide or carbonate is an intriguing reaction intermediate, because it is not stable in the gas phase. Our detailed study of coadsorbed species outlines a possibility to investigate precursors of reactions that involve the substrate atoms.
Tunable Fano-Kondo resonance in side-coupled double quantum dot systems
(2010-08-26)
Chung, Chung-Hou
;
Lee, Tsung-Han
;
電子物理學系
;
Department of Electrophysics
We study the interference between the Fano and Kondo effects in a side-coupled double quantum dot system where one of the quantum dots couples to conduction-electron bath while the other dot only side couples to the first dot via antiferromagnetic (AF) spin-exchange coupling. We apply both the perturbative renormalization-group (RG) and numerical renormalization-group (NRG) approaches to study the effect of AF coupling on the Fano line shape in the conduction leads. With particle-hole symmetry, the AF spin-exchange coupling competes with the Kondo effect and leads to a local spin-singlet ground state for arbitrary small coupling, so-called "two-stage Kondo effect." As a result, via NRG we find the spectral properties of the Fano line shape in the tunneling density of states rho(c)(omega) of conduction-electron leads shows double dip-peak features at the energy scale around the Kondo temperature and the one much below it, corresponding to the two-stage Kondo effect; it also shows an universal scaling behavior at very low energies. We find the qualitative agreement between the NRG and the perturbative RG approaches. Relevance of our work to the experiments is discussed.
Coherent multiple-stage optical rectification terahertz wave generator
(2010-08-26)
Pan, Ci-Ling
;
Huang, Jung Y.
;
Chang, Chen-Shiung
;
Chen, Ching-Wei
;
Lin, Yu-Shian
The present invention coherent multiple-stage optical rectification terahertz wave generator discloses the generation of single-cycle terahertz radiation with two-stage optical rectification in GaSe crystals. By adjusting the time delay between the pump pulses employed to excite the two stages, the terahertz radiation from the second GaSe crystal can constructively superpose with the seeding terahertz field from the first stage. The high mutual coherence between the two terahertz radiation fields is ensured with the coherent optical rectification process and can be further used to synthesize a desired spectral profile of output coherent THz radiation. The technique is also useful for generating high amplitude single-cycle terahertz pulses, not limited by the pulse walk-off effect from group velocity mismatch in the nonlinear optical crystal used.
Formation, Binding, and Stability of O-Ag-CO2-Ag-O Compounds on Ag(100) Investigated by Low Temperature Scanning Tunneling Microscopy and Manipulation
(2010-08-26)
Hsieh, Ming-Feng
;
Li, Hong-Doa
;
Lin, Deng-Sung
;
Morgenstern, Karina
;
物理研究所
The understanding of reaction intermediates in heterogeneous catalysis has important implications for the design of novel catalysts. We investigate the adsorption of CO2 on oxygen precovered Ag(100) at low temperature (17 K) by scanning tunneling microscopy and inelastic electron tunneling manipulation at 5 K. On the terraces, the adsorption leads to O-Ag-CO2-Ag-O compounds with reduced binding of the oxygen to the surface as compared to the separately adsorbed molecules. The compound can be either dissociated into a bistable O-Ag-CO2 compound at 1.6 V, dissociated into its constituents at 2.2 V, or reacted at 6.5 V into a species, which we tentatively attribute to CO3. The thus obtained carbon trioxide or carbonate is an intriguing reaction intermediate, because it is not stable in the gas phase. Our detailed study of coadsorbed species outlines a possibility to investigate precursors of reactions that involve the substrate atoms.
Wide spectral range confocal microscope based on endlessly single-mode fiber
(2010-08-30)
Hubbard, R.
;
Ovchinnikov, Yu. B.
;
Hayes, J.
;
Richardson, D. J.
;
Fu, Y. J.
We report an endlessly single mode, fiber-optic confocal microscope, based on a large mode area photonic crystal fiber. The microscope confines a very broad spectral range of excitation and emission wavelengths to a single spatial mode in the fiber. Single-mode operation over an optical octave is feasible. At a magnification of 10 and lambda = 900 nm, its resolution was measured to be 1.0 mu m (lateral) and 2.5 mu m (axial). The microscope's use is demonstrated by imaging single photons emitted by individual InAs quantum dots in a pillar microcavity. (C) 2010 Optical Society of America
A new low-voltage-driven GRIN liquid crystal lens with multiple ring electrodes in unequal widths
(2010-08-30)
Kao, Yung-Yuan
;
Chao, Paul C. -P.
;
Hsueh, Chieh-Wen
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This work is dedicated to design a novel liquid crystal (LC) lens device with multiple ring electrodes in unequal widths, in order to offer tunability on focusing quality and to lower the level of applied voltage. The number and widths of the multiple ring electrodes are pre-designed and optimized to offer the on-line tunability on individual electrode voltages to render a better refraction index distribution for focusing, as compared to the past hole-type LC lenses. The resulted refractive index distribution is expected to offer similar focusing effects based on the theory of the gradient refraction index (GRIN) lens. The transparent electrodes of this new LC lens are placed at the inner surface of the LC cell to minimize the driving voltages, in results, less than 10V, for the same level of focusing power and an easy practical operation. A new fabrication process in the wafer level to bury bus lines is developed for generating smooth electrical fields over the lens aperture. In addition, a dielectric layer is coated between electrodes and the LC layer. (C) 2010 Optical Society of America