Browsing by Issue Date, starting with "2016-11-14"

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Exploiting concave-convex linear resonators to design end-pumped solid-state lasers with flexible cavity lengths: application for exploring the self-mode-locked operation
(2016-11-14)
Tuan, P. H.
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Chang, C. C.
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Lee, C. Y.
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Cho, C. Y.
;
Liang, H. C.
The characteristics of a convex-concave linear resonator under the thermal lensing effect are theoretically analyzed to find an analytical model for designing end-pumped solid-state lasers with flexible cavity lengths. By exploiting the design model, the power scaling for continuous-wave operation under strong thermal lensing can be easily achieved in the proposed resonator with different cavity lengths. Furthermore, the proposed resonator is applied to explore the exclusive influence of cavity length on the self-mode-locked (SML) operation. It is discovered that the lasing longitudinal modes will split into multiple groups in optical spectrum to lead to a multi-pulse mode-locked temporal state when the cavity length increases. Finally, a theoretical model is derived to reconstruct the experimental results of SML operation to deduce a simple relationship between the group number of lasing modes and the cavity length. (C) 2016 Optical Society of America.
Silicon induced stability and mobility of indium zinc oxide based bilayer thin film transistors
(2016-11-14)
Chauhan, Ram Narayan
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Tiwari, Nidhi
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Liu, Po-Tsun
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Shieh, Han-Ping D.
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Kumar, Jitendra
Indium zinc oxide (IZO), silicon containing IZO, and IZO/IZO: Si bilayer thin films have been prepared by dual radio frequency magnetron sputtering on glass and SiO2/Si substrates for studying their chemical compositions and electrical characteristics in order to ascertain reliability for thin film transistor (TFT) applications. An attempt is therefore made here to fabricate single IZO and IZO/IZO: Si bilayer TFTs to study the effect of film thickness, silicon incorporation, and bilayer active channel on device performance and negative bias illumination stress (NBIS) stability. TFTs with increasing single active IZO layer thickness exhibit decrease in carrier mobility but steady improvement in NBIS; the best values being mu(FE) similar to 27.0, 22.0 cm(2)/Vs and Delta(Vt)h similar to -13.00, -6.75V for a channel thickness of 7 and 27 nm, respectively. While silicon incorporation is shown to reduce the mobility somewhat, it raises the stability markedly (Delta V-th similar to -1.20V). Further, IZO (7 nm)/IZO: Si (27 nm) bilayer based TFTs display useful characteristics (field effect mobility, mu(FE) = 15.3 cm(2)/Vs and NBIS value, Delta V-th = -0.75V) for their application in transparent electronics. Published by AIP Publishing.
Fourier-transform microwave spectroscopy of a halogen substituted Criegee intermediate ClCHOO
(2016-11-14)
Cabezas, Carlos
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Guillemin, Jean-Claude
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Endo, Yasuki
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應用化學系
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Department of Applied Chemistry
Pure rotational spectra of the chloro-substituted Criegee intermediate (ClCHOO) were observed by Fourier-transform microwave spectroscopy. Two conformers (syn and anti) of the isolated molecule were identified from the rotational spectra of the parent and Cl-37 and C-13 isotopologues detected in natural abundance. Rotational constants, centrifugal distortion constants, and all components of the nuclear quadrupole coupling tensor were determined for both conformers. Structural features of the molecule have been rationalized with supporting ab initio calculations and the natural bond orbital analysis, which suggest that the conformational preferences are driven by hyperconjugative effects. Published by AIP Publishing.
Anharmonic Effect of the Decomposition Reaction of Methyl Butanoate
(2016-11-15)
Ding Yang
;
Song Li-Guo
;
Yu Yi-Xuan
;
Yao Li
;
Lin Sheng-Hsien
In this paper, we have used the MP2/6-311++G(2d,2p) method to conduct a detailed investigation of the potential energy surface for the unimolecular dissociation reaction of methyl butanoate (MB). We have also used the Rice-Ramsperger-Kassel-Marcus (RRKM) theory to calculate the rate constants of the canonical and microcanonical systems at temperatures and total energies ranging from 1000 to 5000 K and 451.92 to 1519.52 kJ . mol(-1), respectively. The results indicated that there was an obvious anharmonic effect for the TS2, TS4 and TS5 pathways, and that this effect was too pronounced to be neglected for the unimolecular dissociation reactions of MB.
sBWT: memory efficient implementation of the hardware-acceleration-friendly Schindler transform for the fast biological sequence mapping
(2016-11-15)
Chang, Chia-Hua
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Chou, Min-Te
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Wu, Yi-Chung
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Hong, Ting-Wei
;
Li, Yun-Lung
Motivation: The Full-text index in Minute space (FM-index) derived from the Burrows-Wheeler transform (BWT) is broadly used for fast string matching in large genomes or a huge set of sequencing reads. Several graphic processing unit (GPU) accelerated aligners based on the FM-index have been proposed recently; however, the construction of the index is still handled by central processing unit (CPU), only parallelized in data level (e.g. by performing block-wise suffix sorting in GPU), or not scalable for large genomes. Results: To fulfill the need for a more practical, hardware-parallelizable indexing and matching approach, we herein propose sBWT based on a BWT variant (i.e. Schindler transform) that can be built with highly simplified hardware-acceleration-friendly algorithms and still suffices accurate and fast string matching in repetitive references. In our tests, the implementation achieves significant speedups in indexing and searching compared with other BWT-based tools and can be applied to a variety of domains.
Fault Self-Detection Technique in Fiber Bragg Grating-Based Passive Sensor Network
(2016-11-15)
Yeh, Chien-Hung
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Tsai, Ning
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Zhuang, Yuan-Hong
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Chow, Chi-Wai
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Liu, Wen-Feng
In this paper, we propose and experimentally investigate a fault self-detection technique in fiber Bragg grating (FBG)-based passive sensor network. Here, once a fault occurs on connecting fiber or FBG sensor, it can be detected directly by the proposed sensing network. Moreover, in the proposed FBG sensor system, the multiple wavelength-division-multiplexing FBG sensor numbers can be reduced significantly and also increase the sensing capability for sensing temperature and strain simultaneously. In the measurement, when the temperature variation is from 20 degrees C to 75 degrees C, the measured Bragg wavelength shift of tension is nearly 0.74 nm. While the strain shift of 0.3 mm is applied on FBG, the Bragg wavelength shift of nearly 1.88 nm is observed.
Hierarchically ordered mesoporous carbons and silver nanoparticles as asymmetric electrodes for highly efficient capacitive deionization
(2016-11-15)
Tsai, Yuan-Cheng
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Doong, Ruey-an
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環境工程研究所
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Institute of Environmental Engineering
In this study, a novel capacitive deionization (CDI) technology by using silver nanoparticles and hierarchically ordered mesoporous carbons (HOMCs) as the anode and cathode electrodes, respectively, was developed to enhance the desalination efficiency of sodium ions. The TEM images show that HOMCs are 2-D hexagonal mesostructures with highly ordered 1-D strip-like channels and Ag is spherical with mean diameter of 30 nm. The electrochemical performance of HOMCs and activated carbons (ACs) show rectangular voltammograms at 5-100 mV s(-1), while two peaks with Faradic reaction occur for Ag electrode. The specific capacitance of HOMC electrode is 104.2 F g(-1) at 5 mV s(-1), which is 2.84 times higher than that of ACs. In addition, the asymmetric Ag parallel to HOMC electrodes show excellent electrosorption capacity and high stability toward sodium ion removal and the specific electrosorption capacity (SEC) is 356.3 and 251.6 mu mol g(-1) at 1.2 V in batch and continuous flowing solutions, respectively, which is 1.4-2.7 and 2.2-2.7 times higher than those of symmetric carbon-based electrodes. Results obtained in this study clearly indicate that the asymmetric Ag HHOMC electrode is a promising alternative nanomaterial which can open an innovative CDI technology to treat grey and brown waters that need high desalination efficiency. (C) 2016 Elsevier B.V. All rights reserved.
電解槽
(2016-11-16)
邱俊誠
;
張寶元
;
張晃源
一種電解槽包含一槽本體及二電極組合。該槽本體包括一具有一進液口及一出液口的槽壁，該槽壁界定出一外槽及二被該外槽圍繞的內槽。該外槽與該進液口及該出液口相連通並供一冷卻液流通，該內槽供容置一電解液。該等電極組合分別位於該等內槽中且分別包括一陽極板、陰極板、與陽極板連接的陽極導電結構及與陰極板連接的陰極導電結構。本發明透過調控溫度，而能維持電解水產生氫氧混合氣之效率，此外，利用多槽結構調整其氫氧混合氣的產量，再者，減少電解槽蓋之開孔，能夠增加槽蓋的強度及密閉電解槽的效果。
可攜式檢測裝置
(2016-11-16)
歐陽盟
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邱俊誠
;
黃庭緯
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鄭乃綸
一種可攜式檢測裝置，具有多個發光單元及一界定一軸線且形成一開口的基座。該基座具有一開口及一面積大於開口面積的內壁，藉此，可增加該等發光單元的數量。另外，各發光單元產生的光束朝向軸線投射，相較於彼此平行的各發光單元具有集中的效果。
Laser-induced fluorescence of NO isolated in solid p-H-2
(2016-11-16)
Huang, Shang-Chen
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Lee, Yuan-Pern
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應用化學系
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應用化學系分子科學碩博班
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Department of Applied Chemistry
The p-H-2 matrix has emerged as a novel host for matrix isolation partly because of its diminished cage effect. So far, most spectral investigations were performed with infrared absorption. We investigated the fluorescence of NO isolated in solid p-H-2 upon irradiation at 193 nm and observed emission from the A (2) Sigma (+) ( v = 1), A (2) Sigma (+) ( v = 0), B (2)Pi, and a (4)Pi states, which is distinct from preceding reports of NO in noble-gas matrices. The unique properties of p-H-2 for electronic transitions, such as a small matrix shift on T-00 and distinct phonon interactions, are discussed. (C) 2016 Elsevier B.V. All rights reserved.
電解槽控制系統
(2016-11-16)
邱俊誠
;
張寶元
;
黃煜傑
;
吳晉晟
;
張晃源
一種電解槽控制系統以電解作用會隨電解液溫度上升而導致電解阻抗下降，及電解生成物之產量與電解電流成正比等兩種物理現象為基礎，且電解槽控制系統包含電壓轉換器、電解槽、溫度偵測器、電力偵測器及控制單元，透過控制單元的監控分析，提供固定電壓、固定電流等兩種電解作用模式，達到控制電解槽溫度與電解生成物質量的雙重目標，控制單元包括儲存多個分別對應不同電流值的第一特徵曲線關係的特徵曲線資料庫，每一第一特徵曲線關係記錄多個溫度值及分別負相關對應的多個電壓值。
磁力裝置及其校正方法
(2016-11-16)
胡竹生
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孫冠群
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駱聖文
一種磁力裝置，包含一磁力計、一驅動單元、及一處理單元，並執行一校正方法。該磁力計量測一磁感應強度的一第一分量及一第二分量。該驅動單元驅動該磁力計旋轉，.並偵測一旋轉角度。該處理單元根據在不同的該旋轉角度下該磁力計所產生的複數第一分量及複數第二分量，計算而獲得該磁力計相對於地磁在水平面上的一第一方向角。藉由該磁力計的旋轉及該處理單元的計算，該磁力計所受的磁力干擾之影響能即時地被校正，而獲得不受磁力干擾之影響的該第一方向角。
心律調節裝置及其調節方法
(2016-11-16)
張家齊
;
蕭子健
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許弘毅
一種心律調節裝置及其調節方法。心律調節裝置包含控制單元、感測單元以及分析單元。控制單元用以輸出心律控制訊號對應心臟的跳動頻率。感測單元用以擷取血液脈波訊號。當心律控制訊號具有第一固定節律時，分析單元分析血液脈波訊號的振幅以及血液脈波訊號的反彈波時間，並據以輸出調節參數，控制單元用以根據調節參數將心律控制訊號由第一固定節律調整至相異的第二固定節律。
單級閘極驅動電路之多輸出設計
(2016-11-16)
劉柏村
;
鄭光廷
;
張哲豪
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周凱茹
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吳哲耀
本發明係一種單級閘極驅動電路之多輸出設計，單級閘極驅動電路具有一第一掃描電路及一第二掃描電路，第一掃描電路包含一設定單元及一驅動單元，設定單元接收一起始訊號產生一控制訊號。驅動單元接收控制訊號及一第一時脈訊號，控制訊號及第一時脈訊號使驅動單元產生一第一掃描訊號。驅動單元依據第一時脈訊號驅動第一掃描訊號提升至一第一準位，驅動單元依據第一時脈訊號驅動第一掃描訊號降低至一第二準位。第二掃描電路接收第一掃描訊號及一第二時脈訊號，第二掃描電路依據第一掃描訊號及第二時脈訊號產生一第二掃描訊號。
Palladium-Catalyzed Selective Aryl Ring C-H Activation of N-Acyl-2-aminobiaryls: Efficient Access to Multiaryl-Substituted Naphthalenes
(2016-11-17)
Annamalai, Pratheepkumar
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Chen, Wu-Yin
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Raju, Selvam
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Hsu, Kou-Chi
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Upadhyay, Nitinkumar Satyadev
Palladium-catalyzed cycloaromatization of N-acyl-2-aminobiaryls, through a sequence of ortho C-H bond activation/alkyne insertion/meta C-H bond activation/alkyne insertion, was developed. An efficient synthesis of multiaryl-substituted naphthalenes, N-[2-(5,6,7,8-tetraarylnaphthalen-1-yl) aryl] acetamides, was demonstrated using molecular oxygen as the sole oxidant. Furthermore, through Buchwald\'s synthetic protocol, two compounds were converted into corresponding fluorescent carbazoles in 30-40% yield by intramolecular C-N bond formation.
Robustness of a Topologically Protected Surface State in a Sb2Te2Se Single Crystal
(2016-11-18)
Lee, Chao-Kuei
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Cheng, Cheng-Maw
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Weng, Shih-Chang
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Chen, Wei-Chuan
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Tsuei, Ku-Ding
A topological insulator (TI) is a quantum material in a new class with attractive properties for physical and technological applications. Here we derive the electronic structure of highly crystalline Sb2Te2Se single crystals studied with angle-resolved photoemission spectra. The result of band mapping reveals that the Sb2Te2Se compound behaves as a p-type semiconductor and has an isolated Dirac cone of a topological surface state, which is highly favored for spintronic and thermoelectric devices because of the dissipation-less surface state and the decreased scattering from bulk bands. More importantly, the topological surface state and doping level in Sb2Te2Se are difficult to alter for a cleaved surface exposed to air; the robustness of the topological surface state defined in our data indicates that this Sb2Te2Se compound has a great potential for future atmospheric applications.
菜價爭議　輿論的背後
(2016-11-20)
朱倫君
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Department of Communication and Technology
;
傳播與科技學系
梅姬颱風過後菜價遲遲無法回穩，檢調單位懷疑有心人士哄抬價格，大動作抓菜蟲。
想念漸遠
(2016-11-20)
何家沂
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Department of Communication and Technology
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傳播與科技學系
記錄下想訴說但無人可說的心情
總編輯的話
(2016-11-20)
何肇耕
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Department of Communication and Technology
;
傳播與科技學系
第252期喀報出爐，本期篇數僅有15篇，其中照片故事類目稿件較多，記者們用不同角度試圖捕捉光影的紀錄，能夠從眾多照片中體會到記者所試圖傳達、台灣各個地方發生的大小故事，是本期喀報最大特點。
拖延症
(2016-11-20)
范晨星
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Department of Communication and Technology
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傳播與科技學系
一個罹患重度拖延症患者的故事。