Browsing by Issue Date, starting with "2017-04-18"

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Efficient Heat Dissipation of Uncooled 400-Gbps (16x25-Gbps) Optical Transceiver Employing Multimode VCSEL and PD Arrays
(2017-04-18)
Shih, Tien-Tsorng
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Chi, Yu-Chieh
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Wang, Ruei-Nian
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Wu, Chao-Hsin
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Huang, Jian-Jang
An effective heat dissipation of uncooled 400-Gbps (16x25-Gbps) form-factor pluggable (CDFP) optical transceiver module employing chip-on-board multimode 25-Gbps vertical-surface-emitting-laser (VCSEL) and 25-Gbps photodiode (PD) arrays mounted on a brass metal core embedded within a printed circuit board (PCB) is proposed and demonstrated. This new scheme of the hollow PCB filling with thermally-dissipated brass metal core was simulated and used for high temperature and long term stability operation of the proposed 400-Gbps CDFP transceiver. During one-hour testing, a red-shift of central wavelength by 0.4-nm corresponding temperature increment of 6.7 degrees C was observed with the brass core assisted cooler module. Such a temperature change was significantly lower than that of 28.3 degrees C for the optical transceiver driven with conventional circuit board. After 100-m distance transmission over a multimode fiber (OM4), the 400-Gbps CDFP transceiver exhibited dispersion penalty of 2.6-dB, power budget of >= 3-dB, link loss of <= 0.63-dB, mask margin of 20%, and bit error rate (BER) of <10(-12) with maintained stability more than one hour. The developed 400-Gbps CDFP transceiver module employing low-power consumption VCSEL and PD arrays, effective coupling lens arrays, and well thermal-dissipation brass metal core is suitable for use in the low-cost and high-performance data center applications.
Dielectrophoresis System for Testing Antimicrobial Susceptibility of Gram-Negative Bacteria to beta-Lactam Antibiotics
(2017-04-18)
Su, I-Hsiu
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Ko, Wen-Chien
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Shih, Chung-Hsin
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Yeh, Fang-Hao
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Sun, Yung-Nien
Gram-negative bacteria (GNBs) are common pathogens causing severe sepsis. Rapid evaluation of drug susceptibility would guide effective antibiotic treatment and promote life-saving. A total of 78 Clinical isolates of 13 Gram-negative species collected between April 2013 and November 2013 from two medical centers in Tainan were tested. Bacterial morphology changes in different concentrations of antibiotics were observed under the electric field of a. quadruple electrode array using light microscopy. The minimal inhibitory concentrations (MICs) of four antimicrobial agents, namely, cefazolin, ceftazidime, cefepime, and doripenem, were determined by the dielectrophoretic antimicrobial susceptibility testing (dAST) and by the conventional broth dilution testing (BDT). The antibiotics at the concentration of 1x MIC induced obvious morphological changes in susceptible GNBs, including cell elongation, cell swelling, or lysis, at 90 min. In contrast, resistant strains remained unchanged. The MIC results measured by dAST were in good agreement with those of BDT (essential agreement 95.6%). The Category agreement rate was 89.2%, and the very major errors rate for dAST was 2.9%. In conclusion, dAST could accurately determine drug susceptibility within 90 min. Comprehensive tests by dAST for more drugs against more GNB species are possible in the future.
Direct Observation of Dual-Filament Switching Behaviors in Ta2O5-Based Memristors
(2017-04-18)
Chang, Chia-Fu
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Chen, Jui-Yuan
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Huang, Chun-Wei
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Chiu, Chung-Hua
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Lin, Ting-Yi
交大e-News第230期-交大勁竹丁酉非凡
(2017-04-20)
國立交通大學秘書室
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Secretariat
PAIRING CONNECTION METHOD FOR DEVICES
(2017-04-20)
JYH-CHENG CHEN
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CHUN CHIEN
A pairing connection method for devices utilizes frequency to transmit information from a source device to a target device. Firstly, the frequency range of a transmitted acoustic signal is defined. The source device then divides the acoustic signal into a plurality of spectrum sections based on the length of the information, and the information per unit length is placed in the corresponding spectrum section, and a speaker is used to send out the transmitted acoustic signal. After the target device receives the transmitted acoustic signal, the target device retrieves the information from transmission frequency of the spectrum sections and establishes a connection with the source device.
Performance Characterization of Dye-Sensitized Photovoltaics under Indoor Lighting
(2017-04-20)
Chen, Chia-Yuan
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Jian, Zih-Hong
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Huang, Shih-Han
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Lee, Kun-Mu
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Kao, Ming-Hsuan
Indoor utilization of emerging photovoltaics is promising; however, efficiency characterization under room lighting is challenging. We report the first round-robin interlaboratory study of performance measurement for dye-sensitized photovoltaics (cells and mini-modules) and one silicon solar cell under a fluorescent dim light. Among 15 research groups, the relative deviation in power conversion efficiency (PCE) of the samples reaches an unprecedented 152%. On the basis of the comprehensive results, the gap between photometry and radiometry measurements and the response of devices to the dim illumination are identified as critical obstacles to the correct PCE. Therefore, we use an illuminometer as a prime standard with a spectroradiometer to quantify the intensity of indoor lighting and adopt the reverse-biased current voltage (I-V) characteristics as an indicator to qualify the I-V sampling time for dye-sensitized photovoltaics. The recommendations can brighten the prospects of emerging photovoltaics for indoor applications.
Directed motion from particle size oscillations inside an asymmetric channel
(2017-04-21)
Makhnovskii, Yurii A.
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Sheu, Sheh-Yi
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Yang, Dah-Yen
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Lin, Sheng Hsien
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應用化學系
The motion of a spherical Brownian particle in an asymmetric periodic channel is considered. Under an external periodic stimulus, the particle switches between two states with different particle radius, every half-period. Using Brownian dynamics simulations, we show that the particle size oscillation, combined with the asymmetry of the channel, induces a drift along the channel axis, directed towards the steeper wall of the channel. The oscillation of the particle size is accompanied by a time variation of the space accessible to the particle and by an oscillation of its diffusion coefficient. The former underlies the drift inducing mechanism of purely entropic nature. The latter, combined with the former, leads to a significant amplification of the effect. The drift velocity vanishes when interconversion between the states occurs either very slow or very fast, having a maximum in between. The position and magnitude of the maximum are discussed by providing an analytical approach based on intuitively appealing assumptions. Published by AIP Publishing.
Zwitterionic polymer brush grafting on anodic aluminum oxide membranes by surface-initiated atom transfer radical polymerization
(2017-04-21)
Chu, Chien-Wei
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Higaki, Yuji
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Cheng, Chao-Hung
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Cheng, Ming-Hsiang
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Chang, Chun-Wei
A feasible processing of zwitterionic polymer-grafted anodic aluminum oxide (AAO) membranes by surface-initiated atom transfer radical polymerization (SI-ATRP) and the geometric effect on the polymer chain growth in the confined nanopores were investigated. A zwitterionic poly(3-(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonatopropanesulfonate) (PMAPS) brush was produced on an AAO membrane via introduction of an initiator with a phosphonate group and subsequent SI-ATRP. The PMAPS-grafted AAO membranes were characterized by water droplet contact angle measurement, size exclusion chromatography (SEC), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermo-gravimetric analysis (TGA), and laser Raman micro-spectroscopy. The linear relationship between the grafting yield (Y) of the PMAPS brush and number-average molecular weight (M-n) of the unbound PMAPS indicates that there is no significant geometric effect on the chain growth under the spatial confinement inside the nanopores with diameters of similar to 200 nm. The PMAPS brushes were diminished near the center section along the nanopores because the monomer supply was retarded. The capability of the PMAPS-grafted AAO membranes for inorganic nanoparticle immobilization was also demonstrated using gold nanoparticles (AuNPs) through ion-exchange and reduction processes.
Synthesis and side-chain isomeric effect of 4,9-/5,10-dialkylated-beta-angular-shaped naphthodithiophenes-based donor-acceptor copolymers for polymer solar cells and field-effect transistors
(2017-04-21)
Chiou, De-Yang
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Cao, Fong-Yi
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Hsu, Jhih-Yang
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Tsai, Che-En
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Lai, Yu-Ying
A systematic methodology is developed to construct the angular-shaped beta-form naphthodithiophene (beta-aNDT) core with regiospecific substitution of two alkyl groups at its 4,9-or 5,10-positions via the base-induced double 6 pi-cyclization of dithienyldieneyne precursors, leading to the two isomeric 4,9-beta-aNDT and 5,10-beta-aNDT monomers. It is found that a more curved geometry of the beta-aNDT units intrinsically increases the solubility and thus the solution-processability of the resultant polymers. Therefore, beta-aNDT units are ideal for polymerization with an acceptor-containing monomer without the need for any solubilizing aliphatic side chains, which are considered the insulating portion that jeopardizes charge transport. Based on this consideration, the 4,9- and 5,10-dialkylated beta-aNDT monomers are polymerized with the non-alkylated DTFBT acceptor to afford two P4,9-beta NDTDTFBT and P5,10-beta NDTDTFBT copolymers for head-to-head comparison of the 4,9-inner/5,10-outer isomeric alkylation effect. It is found that 4,9-beta aNDT adopts a twisted conjugated structure due to the intramolecular steric repulsion between the inner branched side chains and the beta-hydrogens on the thiophene rings. The slightly twisted 4,9-beta-aNDT moiety allows P4,9-beta NDTDTFBT to have higher solubility upon polymerization and thus a higher molecular weight, which eventually induces a higher ordered packing structure in the thin film compared to P5,10-beta NDTDTFBT. As a result, P4,9-beta NDTDTFBT exhibits a higher OFET mobility of 0.18 cm(2) V-1 s(-1), and the P4,9-beta NDTDTFBT: PC71BM-based solar cell device also achieves a higher PCE of 7.23%, which is even better than the corresponding P4,9-alpha NDTDTFBT-based device.
實驗教育　另一個學習基地
(2017-04-23)
韓舒容
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Department of Communication and Technology
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傳播與科技學系
介紹什麼是實驗教育和目前實驗教育概況。
拒絕貪婪　阻止血腥盜獵
(2017-04-23)
張博倫
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Department of Communication and Technology
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傳播與科技學系
在世界的許多角落依然存在著盜獵，動物們面臨滅絕危機。
各國熱門遊戲與冷知識
(2017-04-23)
魏若芸
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Department of Communication and Technology
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傳播與科技學系
整理各國的熱門遊戲與有趣的冷知識。
3U生活圈
(2017-04-23)
曾婕茵
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Department of Communication and Technology
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傳播與科技學系
台北市政府於今年二月推動「3U」計畫，聯合其他縣市整合YouBike、U-Motor及U-Car等運具，以共享經濟創造3U生活圈。
遊戲類型知多少
(2017-04-23)
邱琨皓
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Department of Communication and Technology
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傳播與科技學系
線上遊戲的類型有很多，而最令人著迷的則有角色扮演、策略推塔以及競技射擊類型。
台灣女性時裝史　百年風尚
(2017-04-23)
陳昶安
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Department of Communication and Technology
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傳播與科技學系
本表以雜誌排版形式濃縮近一百年來台灣女性的服飾風格流變及軌跡。
無性無愛？遲緩兒與性犯罪
(2017-04-23)
范瑀真
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Department of Communication and Technology
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傳播與科技學系
直視驚悚推理劇「姜老師，你談過戀愛嗎？」當中，遲緩兒角色陳威政的性犯罪行為。
編織創意　獨立遊戲
(2017-04-23)
何肇耕
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Department of Communication and Technology
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傳播與科技學系
開發遊戲並不只是知名遊戲公司的專利，眾志成城的背後實際上有一大群人正奮力築著屬於自己的夢想之城。
室內儲煤倉著手空汙防制
(2017-04-23)
張芳語
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Department of Communication and Technology
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傳播與科技學系
簡述台電未來將建設的室內儲煤倉，可減少火力發電廠的儲煤飛入空氣。
我看醫學生
(2017-04-23)
陳奕璇
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Department of Communication and Technology
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傳播與科技學系
醫學生的心境旁人難以揣測，用人／物的旁觀角度一窺醫學生的生活。
擁抱靈魂的天使　張艾如
(2017-04-23)
林宥成
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Department of Communication and Technology
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傳播與科技學系
臨床心理師張艾如，用著屬於他的溫暖與理解，滋潤每個曾受過傷的靈魂。