Browsing by Issue Date, starting with "2011-04-12"

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Fiber sensing system with self-detection mechanism
(2011-04-12)
Chow
;
Chi-Wai
;
Chi
;
Sien
;
Wang
The present invention discloses a fiber sensing system with self-detection mechanism which utilizes a central office to control secondary ring architecture formed by fiber sensor, remote node and optical coupler primarily. The secondary ring architecture is connected serially to form a primary ring architecture. The central office has a tunable laser light source that can deliver the light source to the fiber sensor. Since the fiber sensor has reflective ability, all light source signal sent by the tunable laser light source will be detected and measured by the fiber sensor. Thus central office can detect all signals reflected by the fiber sensor and produce a spectrum for analyzing fault point locations. The present invention can greatly enhance survivability and sensing capacity of all fiber sensors, so that when a fault point caused by environmental change within the fiber, it will not effect the overall operation of the sensing mechanism. The application of fiber sensor can also reduce cost and complexity of the overall fiber network topology.
Crystal-less communications device and self-calibrated clock generation method
(2011-04-12)
Lee
;
Chen-Yi
;
Yu
;
Jui-Yuan
A communication device uses a local clock generator to regenerate the carrier frequency of the reference signal from a remote communication. In particular, a closed loop is used to self-calibrate the local pulse till the frequency is fixed to be within a fixed frequency margin. Once the local pulse is obtained, the demodulator will use the local pulse to demodulate the reference signal to generate the data signal.
Highly graphitized laterally interconnected SWCNT network synthesis via a sandwich-grown method
(2011-04-13)
Teng, I-Ju
;
Chen, Kai-Ling
;
Hsu, Hui-Lin
;
Jian, Sheng-Rui
;
Wang, Li-Chun
We present a sandwich-grown method for growing laterally interconnected single-walled carbon nanotube (SWCNT) networks with a high degree of graphitization by microwave plasma chemical vapour deposition (MPCVD). An Al(2)O(3)-supported Fe catalyst precursor layer deposited on an oxidized Si substrate with an upper Si cover is first pretreated in pure hydrogen, and then exposed to a gas mixture of methane/hydrogen for growth process at a lower growth temperature and a faster rate. The effects of various parameters, such as catalyst film thickness, gas flow rate, working pressure, growth time and plasma power, on the morphologies and structural characteristics of the SWCNT networks are investigated, and therefore provide the essential conditions for direct growth of laterally interconnected SWCNT networks. Analytical results demonstrate that the SWCNT-based lateral architecture comprises a mixture of graphene-sheet-wrapped catalyst particles and laterally interconnected nanotubes, isolated or branched or assembled into bundles. The results also show that the formation of the laterally interconnected SWCNT networks is related to the sandwich-like stack approach and the addition of an Al(2)O(3) layer in the MPCVD process. The successful growth of lateral SWCNT networks provides new experimental information for simply and efficiently preparing lateral SWCNTs on unpatterned substrates, and opens a pathway to create network-structured nanotube-based devices.
軍醫．學者．文豪森鷗外（1862-1922）－其人及文學
(2011-04-13)
邱若山
;
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。
Process for treating nitrogenous wastewater with simultaneous autotrophic denitrification, hetertrophic denitrification and COD removal
(2011-04-14)
Lee, Der-Ming
;
Chiang, Ming-Kuei
;
Chen, Chin-Te
;
Sung, Keng-Chuan
;
Lin, Jih-Gaw
A process for treating nitrogenous wastewater contains an autotrophic denitrification reaction, a heterotrophic denitrification reaction and a COD removal reaction simultaneously and mixedly taking place in a single reactor. The nitrification reaction is caused by nitrifying bacteria, in which ammonium is oxidized into nitrite. The autotrophic denitrification reaction is caused by autotrophic denitrifying bacteria, in which ammonium used as electron donor and nitrite used as electron acceptor are converted into nitrogen gas and nitrate. The heterotrophic denitrification reaction is caused by heterotrophic denitrifying bacteria, in which nitrate and COD are consumed. It is not necessary to build two separate reactors for aerobic nitrification and anaerobic denitrification, thereby effectively reducing the fabrication and operation cost.
Uniplanar microstrip periodic structure for microwave circuits
(2011-04-14)
Chang, W. S.
;
Chang, C. Y.
;
電信工程研究所
;
Institute of Communications Engineering
A novel microstrip slow-wave structure is presented. The slow-wave factor is mainly controlled by the signal strip and the inserted ground metal pattern in a coplanar manner. A third-order Chebyshev filter was designed and fabricated to demonstrate the proposed structure. Good agreement between the simulated and measured responses is observed.
Document Processing System and Method Thereof
(2011-04-14)
LEE, CHIA-HOANG
;
LIAO, ZAN-WEI
In a document processing system and a document processing method, the document processing method includes the steps of: obtaining a document and dividing the document into a plurality of terms and giving a syntactic index to each of the terms; dividing the document into a plurality of sentences; selecting a key syntactic index from the syntactic indexes, and transforming each of the sentences into a preliminary key terms sequence which includes a preliminary key term corresponding to the key syntactic indexes according to the key syntactic indexes; selectively expanding the preliminary key term of a representative sentence of the document into an advanced key term; and determining at least one core candidate sentence among the sentences to generate a core abstract of the document according to the preliminary key terms and the advanced key term.
Infrared absorption of methanol clusters (CH(3)OH)(n) with n=2-6 recorded with a time-of-flight mass spectrometer using infrared depletion and vacuum-ultraviolet ionization
(2011-04-14)
Han, Hui-Ling
;
Camacho, Cristopher
;
Witek, Henryk A.
;
Lee, Yuan-Pern
;
應用化學系
We investigated IR spectra in the CH-and OH-stretching regions of size-selected methanol clusters, (CH(3)OH)(n) with n = 2-6, in a pulsed supersonic jet by using the IR-VUV (vacuum-ultraviolet) ionization technique. VUV emission at 118 nm served as the source of ionization in a time-of-flight mass spectrometer. The tunable IR laser emission served as a source of predissociation or excitation before ionization. The variations of intensity of protonated methanol cluster ions (CH(3)OH)(n)H(+) and CH(3)OH(+) and (CH(3)OH)(2)(+) were monitored as the IR laser light was tuned across the range 2650-3750 cm(-1). Careful processing of these action spectra based on photoionization efficiencies and the production and loss of each cluster due to photodissociation yielded IR spectra of the size-selected clusters. Spectra of methanol clusters in the OH region have been extensively investigated; our results are consistent with previous reports, except that the band near 3675 cm(-1) is identified as being associated with the proton acceptor of (CH(3)OH)(2). Spectra in the CH region are new. In the region 2800-3050 cm(-1), bands near 2845, 2956, and 3007 cm(-1) for CH(3)OH split into 2823, 2849, 2934, 2955, 2984, and 3006 cm(-1) for (CH(3)OH)(2) that correspond to proton donor and proton acceptor, indicating that the methanol dimer has a preferred open-chain structure. In contrast, for (CH(3)OH)(3), the splitting diminishes and the bands near 2837, 2954, and 2987 cm(-1) become narrower, indicating a preferred cyclic structure. Anharmonic vibrational wavenumbers predicted for the methanol open-chain dimer and the cyclic trimer with the B3LYP/VPT2/ANO1 level of theory are consistent with experimental results. For the tetramer and pentamer, the spectral pattern similar to that of the trimer but with greater widths was observed, indicating that the most stable structures are also cyclic. (C) 2011 American Institute of Physics. [doi:10.1063/1.3572225]
He I Ultraviolet Photoelectron Spectroscopy of Benzene and Pyridine in Supersonic Molecular Beams Using Photoelectron Imaging
(2011-04-14)
Liu, Suet-Yi
;
Alnama, Koutayba
;
Matsumoto, Jun
;
Nishizawa, Kiyoshi
;
Kohguchi, Hiroshi
We performed He I ultraviolet photoelectron spectroscopy (UPS) of jet-cooled aromatic molecules using a newly developed photoelectron imaging (PEI) spectrometer. The PEI spectrometer can measure photoelectron spectra and photoelectron angular distributions at a considerably higher efficiency than a conventional spectrometer that uses a hemispherical energy analyzer. One technical problem with PEI is its relatively high susceptibility to background electrons generated by scattered He I radiation. To reduce this problem, we designed a new electrostatic lens that intercepts background photoelectrons emitted from the repeller plate toward the imaging detector. An energy resolution (Delta E/E) of 0.735% at E = 5.461 eV is demonstrated with He I radiation. The energy resolution is limited by the size of the ionization region. Trajectory calculations indicate that the system is capable of achieving an energy resolution of 0.04% with a laser if the imaging resolution is not limited. Experimental results are presented for jet-cooled benzene and pyridine, and they are compared with results in the literature.
Infrared absorption of methanol clusters (CH3OH)(n) with n=2-6 recorded with a time-of-flight mass spectrometer using infrared depletion and vacuum-ultraviolet ionization
(2011-04-14)
Han, Hui-Ling
;
Camacho, Cristopher
;
Witek, Henryk A.
;
Lee, Yuan-Pern
;
應用化學系
We investigated IR spectra in the CH-and OH-stretching regions of size-selected methanol clusters, (CH3OH)(n) with n = 2-6, in a pulsed supersonic jet by using the IR-VUV (vacuum-ultraviolet) ionization technique. VUV emission at 118 nm served as the source of ionization in a time-of-flight mass spectrometer. The tunable IR laser emission served as a source of predissociation or excitation before ionization. The variations of intensity of protonated methanol cluster ions (CH3OH)(n)H+ and CH3OH+ and (CH3OH)(2)(+) were monitored as the IR laser light was tuned across the range 2650-3750 cm(-1). Careful processing of these action spectra based on photoionization efficiencies and the production and loss of each cluster due to photodissociation yielded IR spectra of the size-selected clusters. Spectra of methanol clusters in the OH region have been extensively investigated; our results are consistent with previous reports, except that the band near 3675 cm(-1) is identified as being associated with the proton acceptor of (CH3OH)(2). Spectra in the CH region are new. In the region 2800-3050 cm(-1), bands near 2845, 2956, and 3007 cm(-1) for CH3OH split into 2823, 2849, 2934, 2955, 2984, and 3006 cm(-1) for (CH3OH)(2) that correspond to proton donor and proton acceptor, indicating that the methanol dimer has a preferred open-chain structure. In contrast, for (CH3OH)(3), the splitting diminishes and the bands near 2837, 2954, and 2987 cm(-1) become narrower, indicating a preferred cyclic structure. Anharmonic vibrational wavenumbers predicted for the methanol open-chain dimer and the cyclic trimer with the B3LYP/VPT2/ANO1 level of theory are consistent with experimental results. For the tetramer and pentamer, the spectral pattern similar to that of the trimer but with greater widths was observed, indicating that the most stable structures are also cyclic. (C) 2011 American Institute of Physics. [doi:10.1063/1.3572225]
Synthesis, Characterization and Photophysical Properties of DCM-Based Light-Harvesting Dendrimers
(2011-04-15)
Vanjinathan, Mahalingam
;
Lin, Hong-Cheu
;
Nasar, A. Sultan
;
材料科學與工程學系
;
Department of Materials Science and Engineering
A series of highly soluble light-harvesting dendrimers up to third generation were synthesized using a DCM-based core and Frechet-type benzyl ether dendrons containing pyrene end groups. All dendrimers and intermediates were characterized by FTIR, (1)H NMR, MALDI-TOF MS, UV-Vis, and PL spectra and EA, GPC, and TGA techniques. The dendrimers emit strong red PL around 570 nm. The excitation of the terminal chromophores results in core emission alone, as the donor emission is seriously quenched due to FRET to the core. The dendrimers showed enhanced luminescence properties of the core, and its efficiency was dependent on the generation number of the dendrimers. The above results reveal that these dendrimers are suitable candidates for red emissive materials in OLEDs.
Alternating Copolymers Incorporating Cyclopenta[2,1-b:3,4-b ']dithiophene Unit and Organic Dyes for Photovoltaic Applications
(2011-04-15)
Cheng, Yen-Ju
;
Hung, Lung-Chang
;
Cao, Fong-Yi
;
Kao, Wei-Shun
;
Chang, Chih-Yu
We have synthesized six p-type copolymers, CPDT-co-TPADCN, CPDT-co-TPADTA, CPDT-co-TPATCN, CPDT-coDFADCN, CPDT-co-DFADTA, and CPDT-co-DFATCN, consisting of a cyclopenta[2,1-b:3,4-b']dithiophene (CPDT) unit and an organic dye in an alternating arrangement. Triphenylamine (TPA) or difluorenylphenyl amine (DFA) units serve as the electron donors, whereas dicyanovinyl (DCN), 1,3-diethyl-2-thiobarbituric acid, or tricyanovinyl (TCN) units act as the electron acceptors in the dyes. The target polymers were prepared via Stille coupling, followed by postfunctionalization to introduce the electron acceptors to the side chains. Because of the strongest withdrawing ability of TCN acceptor to induce efficient intramolecular charge transfer, CPDT-co-TPATCN and CPDT-co-DFATCN exhibit the broader absorption spectra covering from 400 to 900 nm and the narrower optical band gaps of 1.34 eV. However, the CPDT-co-TPATCN:PC(71)BM and CPDT-co-DFATCN:PC(71)BM based solar cells showed the power conversion efficiencies (PCEs) of 0.22 and 0.31%, respectively, due to the inefficient exciton dissociation. The DFA-based polymers possess deeper-lying HOMO energy levels than the TPA-based polymer analogues, leading to the higher V(oc) values and better efficiencies. The device based on CPDT-co-DFADTA:PC(71)BM blend achieved the best PCE of 1.38% with a V(oc) of 0.7 V, a J(sc) of 4.57 mA/cm(2), and a fill factor of 0.43. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49:1791-1801, 2011
Electrode dependence of filament formation in HfO2 resistive-switching memory
(2011-04-15)
Lin, Kuan-Liang
;
Hou, Tuo-Hung
;
Shieh, Jiann
;
Lin, Jun-Hung
;
Chou, Cheng-Tung
This study investigates bipolar and nonpolar resistive-switching of HfO2 with various metal electrodes. Supported by convincing physical and electrical evidence, it is our contention that the composition of conducting filaments in HfO2 strongly depends upon the metal electrodes. Nonpolar resistive-switching with the Ni electrode is attributed to the migration of metal cations and the corresponding electrochemical metallization. Conversely, oxygen-deficient filaments induced by anion migration are responsible for bipolar resistive-switching. It was also found that the characteristic nature of the conducting filaments influences many aspects of switching characteristics, including the switching power, cycling variations, and retention at elevated temperatures. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567915]
Electrode dependence of filament formation in HfO(2) resistive-switching memory
(2011-04-15)
Lin, Kuan-Liang
;
Hou, Tuo-Hung
;
Shieh, Jiann
;
Lin, Jun-Hung
;
Chou, Cheng-Tung
This study investigates bipolar and nonpolar resistive-switching of HfO(2) with various metal electrodes. Supported by convincing physical and electrical evidence, it is our contention that the composition of conducting filaments in HfO(2) strongly depends upon the metal electrodes. Nonpolar resistive-switching with the Ni electrode is attributed to the migration of metal cations and the corresponding electrochemical metallization. Conversely, oxygen-deficient filaments induced by anion migration are responsible for bipolar resistive-switching. It was also found that the characteristic nature of the conducting filaments influences many aspects of switching characteristics, including the switching power, cycling variations, and retention at elevated temperatures. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567915]
Surface deformation from persistent scatterers SAR interferometry and fusion with leveling data: A case study over the Choushui River Alluvial Fan, Taiwan
(2011-04-15)
Hung, Wei-Chia
;
Hwang, Cheinway
;
Chen, Yi-An
;
Chang, Chung-Pai
;
Yen, Jiun-Yee
The Choushui River Alluvial Fan (CRAF), one of the most important agricultural areas in Taiwan, suffers severe subsidence caused by groundwater withdrawal. We use 20 ENVISAT images from 2006 to 2008 to derive vertical deformation over CRAF by persistent scatterer interferometry (PSI), which effectively reduces errors affecting conventional DInSAR techniques. The pixel density over CRAF is 107.6 pixels/km(2), compared to 0.19 points/km(2) of the leveling benchmarks. PSI yields vertical displacements matching the leveling result to 0.6 cm/year (RMS), and provides a higher spatial resolution of subsidence than the latter. We also develop a data fusion method that considers the high-precision, low point-density leveling result as a smoothed correction to the PSI result. The combined field is more representative of overall deformation characteristics than the PSI-only or leveling-only field, and it is better suited for the assessment of the impact of subsidence over CRAF. (C) 2010 Elsevier Inc. All rights reserved.
MicroRNA-122 regulates liver metabolism and hepatocyte differentiation
(2011-04-15)
Tsou, Ann-Ping
;
Tsai, Wei-Chih
;
Hsu, Sheng-Da
;
Hsu, Chu-Sui
;
Hsiao, Ming-Shi
Capillary Action-Supported Contact less Atmospheric Pressure Ionization for the Combined Sampling and Mass Spectrometric Analysis of Biomolecules
(2011-04-15)
Hsieh, Cheng-Huan
;
Chang, Chia-Hsien
;
Urban, Pawel L.
;
Chen, Yu-Chie
;
應用化學系
It is proposed that a short tapered capillary can be utilized as a nanoliter-volume sampling tool and sample emitter for generation of gas-phase ions in front of the mass spectrometer, without the need for using an additional electric power supply, a gas supply, or a syringe pump. A wide range of molecules can be analyzed in pure solutions and complex matrixes (cell extract, urine, and plant tissue) with no or minimum sample preparation. Singly and multiply charged ions can be detected in either positive or negative-ion mode. Because of the nanoliter-volume sampling and low spectral background, the mass detection limit for bradykinin is in the low attomole range. Other advantages include simplicity, disposability, and low cost. The putative mechanism of the ion formation in this capillary-action supported contactless spray emitter is discussed.
擴散光學斷層掃描之影像重建方法、裝置及電腦程式產品
(2011-04-16)
徐源煌
;
方偉騏
;
桑梓賢
一種擴散光學斷層掃描之影像重建方法，包含下述步驟：（a）利用一前算模型求得一權重矩陣；（b）利用奇異分解法得到該權重矩陣的逆矩陣；（c）利用待測物的一子區域取得的接收光線訊號計算一光線強度矩陣，並將光線強度矩陣與權重矩陣之逆矩陣相乘得到組織吸收係數矩陣；（d）運算構成一全區域的各子區域之組織吸收係數矩陣；及（e）整合各子區域的組織吸收係數矩陣並對應不同顏色以得到全區域的擴散光學斷層掃描影像。本發明之功效在於使用子區域用來縮小矩陣而可減少運算量，並使用奇異分解法用於逆求解運算，有利於硬體設計以及可攜式裝置的應用。
利用高速氣流提升微粒充電效率之微粒充電裝置
(2011-04-16)
蔡春進
;
林冠宇
;
陳暉霖
一種利用高速氣流提升微粒充電效率之微粒充電裝置,包含有一外殼以及一放電電極線,外殼具有一充電腔室、一微粒入口、一包覆氣流入口、一出口以及一第一加速通道,該放電電極線是容置於該充電腔室之中,狹窄之第一加速通道係連接於充電腔室與出口之間,可使氣流加速而縮短帶電微粒通過的時間,以便降低帶電微粒之靜電損失,此外,微粒於帶電前是軸向地接近放電電極線,於帶電後是徑向地離開該放電電極線,因此微粒於帶電後可更迅速且均勻地擴散,有助於充電效率之提昇。
遍佈式健康監測站與其健康監測方法
(2011-04-16)
許嘉妤
;
邵家健
;
郭子毅
本發明係揭示一種遍佈式健康監測站與其健康監測方法。其結合使用者認證模組、整合型生理訊號檢測模組、資料處理模組、資料儲存模組，網路通訊模組、人機互動模組以及再生能源供電模組。其中生理訊號檢測模組包含耳溫槍、血壓脈搏計、血氧濃度計或體重計等可加裝或整合的檢測單元。而本發明的主要結構組合方便，殼體方便拆裝，加上以再生能源，例如：太陽能或風力發電，以及使用無線通訊連線，使得本發明可設置於不同場合，讓人們能夠隨時隨地監測個人的健康狀況。因此，本發明不僅有休憩與健康檢測服務，且具由有緊急服務與提供及時資訊等潛在價值。