Browsing by Issue Date, starting with "2013-09-09"

Now showing 1 - 20 of 30717

Laser induced breakdown spectroscopy of pure aluminum with high temporal resolution
(2013-09-09)
Li, Yu-Tai
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Liu, Tze-An
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Chen, Chen-Wei
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Lee, Yu-Hsien
;
Yabushita, Atsushi
We report on a Laser Induced Breakdown Spectroscopy (LIBS) system with a very high temporal resolution, using femtosecond and picosecond pulse laser excitation of pure aluminum (Al). By using a 140 fs Ti:Sapphire laser in an ultrafast optical Kerr gate (OKG), we demonstrate LIBS sampling with a sub-ps time resolution (0.8 +/- 0.08 ps) in a 14 ns window. The width of the gating window in this system was as narrow as 0.8 ps, owing to the inclusion of a carbon disulfide (CS2) cell, which has a fast response and a large nonlinear coefficient. Furthermore, when using a 100 ps pulsed Nd:YAG laser and a fast photomultiplier tube (PMT) we demonstrate a LIBS system with a nanosecond time resolution (2.20 +/- 0.08 ns) in a microsecond window. With this sort of temporal resolution, a non-continuous decay in the Al signal could be observed. After 50 ns decay of the first peak, the second peak at 230 ns is started to perform. Experimental results with such short temporal windows in LIBS, in both nanosecond and microsecond ranges, are important for fast temporal evolution measurements and observations of early continuum emission in materials. (C) 2013 Optical Society of America
Design and demonstration of a colorless WDM-OFDMA PON system architecture achieving symmetric 20-Gb/s transmissions with residual interference compensation
(2013-09-09)
Chen, Hsing-Yu
;
Yuang, Maria
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Tien, Po-Lung
;
Hsu, Dar-Zu
;
Wei, Chia-Chien
In this paper, we propose a two-tiered colorless WDM-OFDMA PON system architecture that draws strengths from each individual WDM and OFDM PON systems. Specifically, the two-tiered architecture enables a colorless transceiver to be shared by a group of ONUs, resulting in drastic reduction of the system cost. For achieving colorlessness via reusing downstream light sources, we discover the residual power of downstream signal unexpectedly springs back after transmissions, causing severe interference to the upstream signal, and thus limiting the data rate of the upstream signal. We devise a method of adopting a common dispersion compensation module at OLT to reduce the residual power over all wavelengths. Experimental results show that, with an improvement of upstream signal's SNR up to 10dB, the system successfully achieves 20-Gb/s bidirectional OFDM-signal transmissions on the same wavelength over a 20-km SMF. (C) 2013 Optical Society of America
Pulfrich autostereo display with micro-prism array
(2013-09-09)
Chen, Chien-Yue
;
Ke, Ming-Da
;
Deng, Qing-Long
;
Siao, Jhih-Kai
;
光電系統研究所
A micro-prism film, with spectral characteristics, is attached on a display panel to show images appearing with + 10 degrees similar to + 50 degrees and -10 degrees similar to-50 degrees bright regions and with a + 10 degrees similar to-10 degrees dark region. When both eyes separately receive the bright region and the dark region of an image, interocular delay would appear to generate a stereo perception. With the optical simulation software, LightTools 7.3.0, to simulate the brightness change, the light with lower brightness appears on the 0 degrees region and the light with the highest brightness appears on the +/- 10 degrees region. The optimal viewing distance of 25cm could accurately deliver the image with shading parallax to both eyes. The actual measurement of brightness presents the shading distribution, achieving the condition of binocular retinal illumination, and the angle of visibility appears on the +/- 50 degrees region, causing interocular delay so that the viewer generates the stereo perception. (C)2013 Optical Society of America
An Acid-Base Controllable Hierarchical Nanostructure from a NIR-Absorbing Conjugated Polyrotaxane-Based Optical Molecular Switch
(2013-09-10)
Raju, Mandapati V. Ramakrishnam
;
Raghunath, P.
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Lin, Ming-Chang
;
Lin, Hong-Cheu
;
材料科學與工程學系
To investigate the supramolecular interactions of the mechanically interlocked rotaxane pendants and conjugated polymer backbones, four analogous polymers were systematically synthesized by copolymerization of a 9-alkylidene-9H-fluorene monomer with various monomers, which contained a diketopyrrolopyrrole unit tethered with a dumbbell unit, a metalated [2]rotaxane, a demetalated orthogonal H-bonded [2]rotaxane, and a simple alkyl chain, to furnish P1, P2, P3, and P4, respectively. Prevailing H-1 NMR and UV-vis to NIR titration profiles indicated that the novel polyrotaxane P3 showed a sensitive and reversible acid base molecular switch capability via supramolecular interactions in contrast to the other polymers (P1, P2, and P4). Compared with the other polymers, P3 possessed a narrower bandgap, which was also confirmed by the computational study. Prominently, the monitoring of a controllable nanoself-assembly process of P3 was obtained by reversible acid base molecular switch approaches. The orthogonal H-bonded pendant [2]rotaxane unit and the steric demand of P3 judiciously allowed to morph into a hierarchical nanostructure via interconvertible H-bonds, anion-pi and pi-pi stackings, and hydrophobic interactions.
一種具有週期性形狀結構透明導電極之太陽能電池裝置
(2013-09-11)
曾斌誠
;
余沛慈
;
郭浩中
本發明揭露一種具有週期性形狀結構透明導電極之太陽能電池裝置，其結構包括了透明基板，且透明導電極刑成於該透明基板上，以及吸收層形成於該透明導電極上；而該透明導電極具有柱狀，梯柱狀，錐狀，尖錐狀，以及奶嘴狀等形狀。本發明可使用於大面積製程之光子晶體，且應用於各式薄膜太陽能電池或各式的光偵測器中，可增加光子吸收率而達到更高之光電轉換效率。
車輛追蹤系統及其方法
(2013-09-11)
吳炳飛
;
陳彥霖
;
黃皓昱
;
范崇瑞
本發明係揭露一種車輛追蹤系統及其方法，本方法係包含以明亮物件切割法擷取影像中之明亮物件，並以連通物件標定法對明亮物件進行座標的標定而形成連通物件，接著以明亮物件辨識法對連通物件進行特徵判定、分析及合併而形成車燈物件，並以多車輛追蹤法對車燈物件進行軌跡追蹤，最後再以車輛辨識法對車燈物件進行車輛種類辨識，並計算各種車輛的數量。
液晶變焦透鏡
(2013-09-11)
丘祺緯
;
趙昌博
;
林育正
;
薛傑文
一種液晶變焦透鏡，包括一接地之下電極結構、一上電極結構及設於兩者間之液晶層，其中上電極結構之電極係分割為未連接之環形電極區及外圍電極區，且分別施予不同電壓，以改善傳統液晶變焦透鏡中心電場不足的缺失。又上電極結構亦可由上、下孔洞電極所構成，抑或於一基板的上、下表面分別設置一電極，且二電極中央具有不同大小之圓形孔洞。
利用超音波與電腦視覺偵測之自動導航裝置及其導航方法
(2013-09-11)
吳至仁
;
蔡雙圓
;
蔡文祥
本發明係揭露一種利用超音波與電腦視覺偵測之自動導航裝置及其導航方法，首先讓一使用者帶領一自動導航裝置，使自動導航裝置學習並規劃一航行路徑，接著使自動導航裝置獨立導航，且於此時可利用超音波與電腦視覺偵測周圍環境，並藉此比對航行路徑，以校正自動導航裝置之實際航行路線，本發明可讓不會使用電腦的普羅大眾，不必接觸電腦，也能使用自動移動裝置作互動，加以本發明是利用電腦視覺及超音波偵測，更能降低製造商在硬體方面的成本。
BEAM STEERING ANTENNA STRUCTURE
(2013-09-12)
Hwang Ruey-Bing
;
Yang Su-Che
;
Huang Hsien-Tung
Disclosed is a beam steering antenna structure, including two parallel metallic boards, an antenna perpendicularly disposed between the two metallic boards, a plurality of substrates perpendicularly disposed between the two metallic boards and radially disposed around the antenna, and a bias voltage circuit. Each of the substrates has a plurality of metal units cyclically aligned thereon, and each of the metal units includes two metallic regions oppositely disposed and in no contact with each other and a transistor disposed between the two metallic regions for coupling the two metallic regions. The transistors are electrically connected to the bias voltage circuit to thereby control the steering direction of beam radiation by switching the transistors.
Microalgae for Removal of Carbon Dioxide Generated from Biogas and Biogas Electric Generator
(2013-09-12)
TSENG Ching-Ping
;
LIN Chih-Sheng
;
CHEN Chiun-Hsun
The present invention relates to biogas and biogas electric generator and a biogas electricity generation method by use microalgae for removal of carbon dioxide generated from biogas and biogas electric generator. The electric generator integrates biogas production and purification, microalga culture, electricity generation, heat recycling and others into a unit volume, and, during microalgae culturing, uses carbon dioxide contained in biogas and that produced from electricity generation as a carbon source for photosynthesis to reduce the carbon dioxide contained in the biogas and the electricity generation exhaust gas, thereby attaining the goal of zero carbon emission.
FLEXIBLE MICRO-SYSTEM AND FABRICATION METHOD THEREOF
(2013-09-12)
CHAO TZU-YUAN
;
LIANG CHIA-WEI
;
CHENG YU-TING
A fabrication method for integrating chip(s) onto a flexible substrate in forming a flexible micro-system. The method includes a low-temperature flip-chip and a wafer-level fabrication process. Using the low-temperature flip-chip technique, the chip is bonded metallically onto the flexible substrate. To separate the flexible substrate from the substrate, etching is used to remove the sacrificial layer underneath the flexible substrate. The instant disclosure applies standardized micro-fabrication process for integrating chip(s) onto the flexible substrate. Without using special materials or fabrication procedures, the instant disclosure offers a cost-effective fabrication method for flexible micro-systems.
Low-complexity time-domain linear equaliser for single-carrier block transmissions
(2013-09-12)
Ma, C. -Y.
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Huang, C. -C.
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傳播研究所
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Institute of Communication Studies
Traditionally, frequency-domain equalisers have been used to equalise the single-carrier block transmission (SCBT) signals. However, to support the frequency-domain equaliser, two fast Fourier transform modules are required, which will increase the circuit complexity and chip area. A low-complexity time-domain linear equaliser for SCBT is proposed, which is less complicated than conventional frequency-domain equalisers, at the expense of an acceptable degradation in performance. For instance, for 60 GHz conference room non-line-of-sight channels, the complexity can be reduced by half at the expense of a 1.5 dB performance loss.
Comment on "Giant Plasticity of a Quantum Crystal"
(2013-09-13)
Zhou, C.
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Reichhardt, C.
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Graf, M. J.
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Su, J. -J.
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Balatsky, A. V.
Recognition of hydrogen isotopomers by an open-cage fullerene
(2013-09-13)
Murata, Yasujiro
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Chuang, Shih-Ching
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Tanabe, Fumiyuki
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Murata, Michihisa
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Komatsu, Koichi
We present our study on the recognition of hydrogen isotopes by an open-cage fullerene through determination of binding affinity of isotopes H-2/HD/D-2 with the open-cage fullerene and comparison of their relative molecular sizes through kinetic-isotope-release experiments. We took advantage of isotope H-2/D-2 exchange that generated an equilibrium mixture of H-2/HD/D-2 in a stainless steel autoclave to conduct high-pressure hydrogen insertion into an open-cage fullerene. The equilibrium constants of three isotopes with the open-cage fullerene were determined at various pressures and temperatures. Our results show a higher equilibrium constant for HD into open-cage fullerene than the other two isotopomers, which is consistent with its dipolar nature. D-2 molecule generally binds stronger than H-2 because of its heavier mass; however, the affinity for H-2 becomes larger than D-2 at lower temperature, when size effect becomes dominant. We further investigated the kinetics of H-2/HD/D-2 release from open-cage fullerene, proving their relative escaping rates. D-2 was found to be the smallest and H-2 the largest molecule. This notion has not only supported the observed inversion of relative binding affinities between H-2 and D-2, but also demonstrated that comparison of size difference of single molecules through non-convalent kinetic-isotope effect was applicable.
Large Magnetoresistance in Magnetically Coupled SrRuO3-CoFe2O4 Self-Assembled Nanostructures
(2013-09-14)
Liu, Heng-Jui
;
Vu-Thanh Tra
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Chen, Ying-Jiun
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Huang, Rong
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Duan, Chun-Gang
Ultrathin Limit of Exchange Bias Coupling at Oxide Multiferroic/Ferromagnetic Interfaces
(2013-09-14)
Huijben, M.
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Yu, P.
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Martin, L. W.
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Molegraaf, H. J. A.
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Chu, Y. -H.
Toward Wireless Backhaul Using Circuit Emulation Over Optical Packet-Switched Metro WDM Ring Network
(2013-09-15)
Chao, I-Fen
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Yuang, Maria C.
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資訊工程學系
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Department of Computer Science
Optical WDM metro-ring networks have been considered to be promising solutions for wireless backhaul. In this paper, we propose an integrated traffic control scheme (ITCS), which facilitates circuit emulation service (CES) for wireless backhaul over a previously proposed experimental optical packet-switched WDM metro-ring network, HOPSMAN. The ITCS seamlessly integrates variable-bit-rate (VBR) CES wireless with connection-less best-effort data, satisfying stringent QoS requirements and retaining maximal network throughput. The ITCS ensures efficient setup of CES connections by employing a simple mean-rate-based distributed admission control followed by a novel slot-marking reservation. The total connection setup delay is comprised of the setup queueing delay and slot-marking delay. While the slot-marking delay is nearly a ring time, the mean setup queueing delay is formally computed through an accurate approximation based on an M/G/m queueing analysis. We show simulation results to demonstrate that the ITCS accommodates remarkably high CES traffic loads while satisfying a wide range of delay requirements for wireless backhaul. Taking the background best-effort traffic into account, ITCS achieves exceedingly low delay, jitter, and delay bound for CES under various traffic loads and burstiness.
Investigation of the effects of ultrasonic vibration-assisted micro-upsetting on brass
(2013-09-15)
Hung, Jung-Chung
;
Tsai, Yu-Chung
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機械工程學系
;
Department of Mechanical Engineering
Ultrasonic vibration is widely applied in traditional metal forming to soften material and to increase formability. However, the effects of ultrasonic vibration on miniaturized workpieces must be studied before applying its benefits to metallic micro-forming. This study investigates the effects of applying ultrasonic vibration to micro-forming, along with two other factors: specimen size and grain size. Conventional (without ultrasonic vibration) and ultrasonic vibration micro-upsetting experiments were conducted using brass (C2600). Specimens of three different dimensions (phi 3 x 4.5 mm, phi 2 x 3 mm, and phi 1 x 1.5 mm) and of three grain sizes (12 mu m, 44 mu m, and 90 mu m) were used. The conventional micro-upsetting (CMU) experiment revealed the size-effect in which flow stress decreased with the miniaturizing of the specimen. Flow stress also decreased as the grain size increased, but at a smaller magnitude than that of the size-effect. Results show that ultrasonic vibration-assisted micro-upsetting (UMU) decreased the flow stress effectively, especially in miniaturized specimens. The amount of decrease was related more to the dimension than to the grain size of the specimen. (C) 2013 Elsevier B.V. All rights reserved.
波束控制天線結構
(2013-09-16)
黃瑞彬
;
楊肅哲
;
黃獻東
一種波束控制天線結構,包括:兩個相互平行的金屬板、垂直設置於該兩個金屬板之間的天線、垂直設置於該兩個金屬板之間且輻射狀配置於天線周圍的複數個基板、以及偏壓電路。各基板上具有週期性排列的複數個金屬單元,而各金屬單元包括兩個相對設置而不相互接觸的金屬區及設置於該兩個金屬區之間用以耦接該兩個金屬區的電晶體,且各電晶體係電性連接至該偏壓電路。本發明可藉由調整基板上的電晶體的開/關來控制所述的天線結構的波束方向。
磁性奈米複合材料及其製造方法及應用
(2013-09-16)
李耀坤
;
詹富全
;
黃靜萍
本發明之一種磁性奈米複合材料,包括至少一磁性奈米粒子、一修飾層、一配位基團以及一高分子包覆層。修飾層係包括複數矽烷基團,並包覆至少部分磁性奈米粒子,且修飾層具有複數凹部。配位基團係連結於修飾層之凹部。高分子包覆層係連結修飾層。本發明另提供一種磁性奈米複合材料之製造方法以及磁性奈米複合材料應用於蛋白質之純化。