Browsing by Issue Date, starting with "2014-05-05"

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交大e-News第162期
(2014-05-05)
Secretariat
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國立交通大學秘書室
Dealloyed Pt2Os nanoparticles for enhanced oxygen reduction reaction in acidic electrolytes
(2014-05-05)
Lee, Yi-Juei
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Hsieh, Yu-Chi
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Tsai, Ho-Cheng
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Lu, I-Te
;
Wu, Yue-Han
Carbon-supported Pt2Os (Pt2Os/C) nanoparticles in 3.55 nm sizes are synthesized from a wet chemical reflux process. Subsequently, the Pt2Os/C undergoes a dealloying treatment in which multiple cyclic voltammetric scans are imposed to dissolve the Os atoms selectively from the surface of the Pt2Os nanoparticles. X-ray diffraction signals from the dealloyed sample (DA-Pt2Os/C) indicate a fcc phase and composition analysis suggests Pt4Os. Line scans from the scanning transmission electron microscope confirm that the surface of Pt4Os is depleted with the Os atoms. This agrees with our quantum mechanics (Density Funtional theory) calculations, which predict for the Pt3Os composition that the surface skin layer is pure Pt. The DA-Pt2Os/C shows impressive electrocatalytic behaviors (0.29 mA mu g(Pt)(-1) in mass activity and 1.03 mA cm(Pt)(-2) in specific activity) for the oxygen reduction reaction (ORR) in oxygen-saturated 0.1 M aqueous HClO4 solution, as compared to those of commercially available Pt/C and as-synthesized Pt2Os/C. In stability test, the DA-Pt2Os/C demonstrates a better retention of ORR activities and a smaller loss of electrochemical active surface area. We verify experimentally that a four-electron step is responsible for the ORR process occurring on the DA-Pt2Os/C. (C) 2014 Elsevier B.V. All rights reserved.
Artificial sunlight and ultraviolet light induced photo-epoxidation of propylene over V-Ti/MCM-41 photocatalyst
(2014-05-05)
Van-Huy Nguyen
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Lin, Shawn D.
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Wu, Jeffrey Chi-Sheng
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Bai, Hsunling
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環境工程研究所
The light irradiation parameters, including the wavelength spectrum and intensity of light source, can significantly influence a photocatalytic reaction. This study examines the propylene photo-epoxidation over V-Ti/MCM-41 photocatalyst by using artificial sunlight (Xe lamp with/without an Air Mass 1.5 Global Filter at 1.6/18.5 mW.cm(-2)) and ultraviolet light (Mercury Arc lamp with different filters in the range of 0.1-0.8 mW.cm(-2)). This is the first report of using artificial sunlight to drive the photo-epoxidation of propylene. Over V-Ti/MCM-41 photocatalyst, the propylene oxide (PO) formation rate is 193.0 and 112.1 mu mol.gcat(-1).h(-1) with a PO selectivity of 35.0 and 53.7% under UV light and artificial sunlight, respectively. A normalized light utilization (NLU) index is defined and found to correlate well with the rate of both PO formation and C3H6 consumption in log-log scale. The light utilization with a mercury arc lamp is better than with a xenon lamp. The selectivity to PO remains practically unchanged with respect to NLU, suggesting that the photo-epoxidation occurs through the same mechanism under the conditions tested in this study.
Field effect of in-plane gates with different gap sizes on the Fermi level tuning of graphene channels
(2014-05-05)
Lin, Meng-Yu
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Chen, Yen-Hao
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Wang, Cheng-Hung
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Su, Chen-Fung
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Chang, Shu-Wei
Tuning of the Fermi level is investigated in graphene channels using two in-plane gates with significantly different-sized isolating gaps. While the n-type tuning was achievable in both schemes, the wide-gap device had an enhanced minimum drain current and less prominent current modulation than the narrow-gap device. In addition, further p-type tuning was not observed in the wide-gap device at negative gate biases. These phenomena indicated that both devices had distinct field-strength dependences and Fermi level tuning effects, which may be critical for the practical design of devices. (C) 2014 AIP Publishing LLC.
Aperiodic and randomized dielectric mirrors: alternatives to metallic back reflectors for solar cells
(2014-05-05)
Lin, Albert
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Zhong, Yan-Kai
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Fu, Sze-Ming
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Tseng, Chi Wei
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Yan, Sheng Lun
Dielectric mirrors have recently emerged for solar cells due to the advantages of lower cost, lower temperature processing, higher throughput, and zero plasmonic absorption as compared to conventional metallic counterparts. Nonetheless, in the past, efforts for incorporating dielectric mirrors into photovoltaics were not successful due to limited bandwidth and insufficient light scattering that prevented their wide usage. In this work, it is shown that the key for ultra-broadband dielectric mirrors is aperiodicity, or randomization. In addition, it has been proven that dielectric mirrors can be widely applicable to thin-film and thick wafer-based solar cells to provide for light trapping comparable to conventional metallic back reflectors at their respective optimal geometries. Finally, the near-field angular emission plot of Poynting vectors is conducted, and it further confirms the superior light-scattering property of dielectric mirrors, especially for diffuse medium reflectors, despite the absence of surface plasmon excitation. The preliminary experimental results also confirm the high feasibility of dielectric mirrors for photovoltaics. (C)2014 Optical Society of America
Real Time Observation of the Formation of Hollow Nanostructures through Solid State Reactions
(2014-05-06)
Lai, Huang-Yen
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Huang, Chun-Wei
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Chiu, Chung-Hua
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Wang, Chun-Wen
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Chen, Jui-Yuan
We demonstrate the formation of hollow nickel germanide nanostructures of Ni-Ge core-shell nanoparticles by solid state reactions. The structural evolutions of nickel germanide hollow nanostructures have been investigated in real-time ultrahigh vacuum transmission electron microscopy (UHV-TEM). Annealed above 450 degrees C, the nonequilibrium interdiffusion of core and shell species occurred at the interface; thus, Ni germanide hollow nanostructures were formed by solid state reactions involving the Kirkendall effect. In addition, the different hollow nanostructures formed from different core diameters of Ni-Ge core-shell nanoparticles have been studied. Also, we propose the mechanism with effects of the size and annealing duration on the solid state reactions based on the Kirkendall effect.
Hybrid codec apparatus and method for data transferring
(2014-05-06)
Yi Chih-Wei
;
Liu Pin-Chuan
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Lu Hsiao-Heng
In a hybrid codec apparatus for data broadcasting, an encoder divides a source file into N sections, generates N principal encoded data after coding on a first finite field and k additional encoded data after coding on a second finite field, then transmits a group of coefficient encoded data and the N+k encoded data to a decoder. The decoder merges the group of coefficient encoded data and the N+k encoded data, and decodes the N principal encoded data on the first finite field. When the decoder fails to decode the N principal encoded data, the decoder uses the k additional encoded data to assist the data decoding on the second finite field. After the decoding, a recovered source file is produced.
Independently-controlled-gate SRAM
(2014-05-06)
Chuang Ching-Te
;
Chen Yin-Nien
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Hsieh Chien-Yu
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Fan Ming-Long
;
Hu Pi-Ho
The present invention provides an IG 7T FinFET SRAM, which adopts independently-controlled-gate super-high-VT FinFETs to achieve a stacking-like property, whereby to eliminate the read disturb and half-select disturb. Further, the present invention uses keeper circuits and read control voltage to reduce leakage current of the bit lines during read. Furthermore, the present invention can effectively overcome the problem of the conventional 6T SRAM that is likely to have read errors at low operation voltage.
PORTABLE 2-DIMENSION OXIMETER IMAGE DEVICE
(2014-05-08)
Fang Wai-Chi
;
Chen Tien-Ho
;
Kang Shih
;
Wu Shih-Yang
;
Cheng Ching-Ju
A portable 2-dimension oximeter image device is disclosed. The portable 2-dimension oximeter image device includes a plurality of light sources for emitting light to an object to be measured such that a plurality of sensors can sense the intensity of reflected light from the measured object; an analysis processor for receiving the light intensity sensed by the front-end detectors to analyze and calculate based on an oxygen saturation distribution algorithm to generate oxygen saturation distribution information; an image reconstruction unit for reconstructing an image according to the oxygen saturation distribution information to generate image information with a color scale to demonstrate the differences in the object's oxygen saturation in each regional tissue of the object, thereby providing an effective and accurate regional detection range.
Bronchial asthma is associated with increased risk of chronic kidney disease
(2014-05-08)
Huang, Hui-Ling
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Ho, Shinn-Ying
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Li, Chien-Hsun
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Chu, Fang-Ying
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Ciou, Li-Ping
Background: Bronchial asthma influences some chronic diseases such as coronary heart disease, diabetes mellitus, and hypertension, but the impact of asthma on vital diseases such as chronic kidney disease is not yet verified. This study aims to clarify the association between bronchial asthma and the risk of developing chronic kidney disease. Methods: The National Health Research Institute provided a database of one million random subjects for the study. A random sample of 141 064 patients aged >= 18 years without a history of kidney disease was obtained from the database. Among them, there were 35 086 with bronchial asthma and 105 258 without asthma matched for sex and age for a ration of 1:3. After adjusting for confounding risk factors, a Cox proportional hazards model was used to compare the risk of developing chronic kidney disease during a three-year follow-up period. Results: Of the subjects with asthma, 2 196 (6.26%) developed chronic kidney disease compared to 4 120 (3.91%) of the control subjects. Cox proportional hazards regression analysis revealed that subjects with asthma were more likely to develop chronic kidney disease (hazard ratio [HR]: 1.56; 95% CI: 1.48-1.64; p < 0.001). After adjusting for sex, age, monthly income, urbanization level, geographic region, diabetes mellitus, hypertension, hyperlipidemia, and steroid use, the HR for asthma patients was 1.40 (95% CI: 1.33-1.48; p = 0.040). There was decreased HRs in steroid use (HR: 0.56; 95% CI: 0.62-0.61; p < 0.001) in the development of chronic kidney disease. Expectorants, bronchodilators, anti-muscarinic agents, airway smooth muscle relaxants, and leukotriene receptor antagonists may also be beneficial in attenuating the risk of chronic kidney disease. Conclusions: Patients with bronchial asthma may have increased risk of developing chronic kidney disease. The use of steroids or non-steroidal drugs in the treatment of asthma may attenuate this risk.
Switching driving method used for a driving system
(2014-05-08)
HU Jwu-Sheng
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JAO Hsien-Tang
The present invention discloses a switching driving method used for a driving system. The driving system transforms any type of waveforms to switching signal array by switching strategy modulation, and transmits to switching circuit. Any type of driving waveforms can be generated through high-speed switching the switching circuit. The waveforms can be generated by operating the switching circuit with the switching strategy. The losses of the switch can be reduced, and the modulation ability of driving signal having several waveforms and multi-channels can be improved.
Radial Hele-Shaw flow with suction: Fully nonlinear pattern formation
(2014-05-09)
Chen, Ching-Yao
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Huang, Yu-Sheng
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Miranda, Jose A.
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機械工程學系
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Department of Mechanical Engineering
We study the development of intricate, fully nonlinear immiscible interfacial patterns in the suction-driven radial Hele-Shaw problem. The complex-shaped, contracting fluid-fluid interface arises when an initially circular blob of more viscous fluid, surrounded by less viscous one, is drawn into an eccentric point sink. We present sophisticated numerical simulations, based on a diffuse interface model, that capture the most prominent interfacial features revealed by existing experimental studies of the problem. The response of the system to changes in the capillary number is investigated, accurately revealing the occurrence of finger competition phenomena, and correctly describing the velocity behavior of both inward-and outward-pointing fingers. For the large-capillary-number regime, a set of complex interfacial features (finger merging, shielding, and pinch-off) whose experimental realization is still not available, are predicted.
ナノワイヤチャネルを有する半導体装置の製造方法およびこの装置を用いた半導体装置の製造方法
(2014-05-09)
ポ－イクオ
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ティエン－シェンチャオ
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イ－シェンル
The Cournot production game with multiple firms under an ambiguous decision environment
(2014-05-10)
Dang, Jr-Fong
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Hong, I-Hsuan
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Lin, Jing-Ming
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工業工程與管理學系
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Department of Industrial Engineering and Management
The recent economic recession has added more uncertainty to industries' decision processes regarding production quantity. Moreover, due to the nature of ambiguous information, manufacturers often fail to achieve precise assessments of the parameters of market demand, production cost functions, etc. This paper develops the Cournot production game with multiple firms in an ambiguous decision environment, where the form of ambiguity is described by a set of fuzzy parameters. Our model applies the weighted center of gravity method (WCoG) to defuzzify the fuzzy profit function considering firms' control parameters. The resulting outcomes are in the form of matrix representations. We also analyze the effect of firms' control parameters on outcomes. The results indicate that a firm's fuzzy profit function plays an important role in economic interpretation. To investigate the effect of parameter perturbations on firms' outcomes, we also conduct the sensitivity analysis. (C) 2014 Elsevier Inc. All rights reserved.
A fuzzy integral-based model for supplier evaluation and improvement
(2014-05-10)
Liou, James J. H.
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Chuang, Yen-Ching
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Tzeng, Gwo-Hshiung
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科技管理研究所
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Institute of Management of Technology
Decisions related to supplier improvement and selection are inherently multiple criteria decision making (MCDM) problems and are strategically important to companies. Although efforts have been made to discover systematic methods to select the proper supplier, these efforts have assumed that the criteria are independent, which is not actually the case. Some studies that have treated the criteria as interdependent use additive models to obtain aggregate performance. We propose a novel fuzzy integral-based model that addresses the interdependence among the various criteria and employs the non-additive gap-weighted analysis. The structure of the relationships among the criteria and the criteria weights are developed using Decision Making Trial and Evaluation Laboratory (DEMATEL) combined with a fundamental concept of an analytic network process (ANP) called DANP. The fuzzy integral is then used to aggregate the gaps using the weights obtained from the DANP. The proposed model addresses the shortcomings of prior models and provides a more reasonable representation of the real world. The method is demonstrated using supplier evaluation and improvement data from a Taiwanese company. (C) 2013 Published by Elsevier Inc.
應用於太陽能電池之背電極結構及其製作方法
(2014-05-11)
蔡娟娟
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徐振航
一種應用於太陽能電池中背電極結構，其中太陽能電池包括一第一透明導電層、一太陽能電池單元及一背電極結構，第一透明導電層設置於太陽能電池單元之一側，背電極結構設置於第一透明導電層之相對於太陽能電池單元之另一側。背電極結構包括一粒狀結構、一透明導電層及一電極。粒狀結構設置於第一透明導電層之表面上，透明導電層設置於粒狀結構及第一透明導電層上，並且電極設置於粒狀結構及透明導電層上。其特徵為透明導電層之高度等於或小於粒狀結構之直徑，使得粒狀結構係位於透明導電層及電極之界面。
學生新聞　校園媒體大車拼
(2014-05-11)
韓惠宇
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Department of Communication and Technology
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傳播與科技學系
設有傳播科系的大專院校中，往往都有讓學生實習的校園媒體，學生能透過相關媒體訓練，提早與社會接軌。
多功能求救立柱
(2014-05-11)
林進燈
;
劉炳忠
;
施大千
【物品用途】一種多功能求救立柱，尤指一種具有求救功能的立柱。【設計說明】本設計係有關於一種多功能求救立柱設計，尤指如附圖所示之整體線條流暢別緻之意境設計，俾供使用者於視覺上的新享受。請參閱全部附圖所示，整體而言為一柱體，而該柱體頂部外型略呈圓形態樣，且該柱體頂部向下延伸漸擴之凸部上設有數個呈圓形的按鍵區，再由凸部向下延伸漸縮至柱體底部設置一呈矩形狀之底座，，其整體外形圓潤中帶有厚實感，並兼具層次變化之視覺效果。綜觀上述，本創作其具有(風格說明)，而產生尤為新穎之視覺感受，誠屬難得之創作，且從未見於任何刊物或曾公開使用，完全符合〔新穎性〕及〔設計性〕之設計要件，爰依專利法之規定向鈞局提呈本案設計專利申請。尚鈞局暨貴審查委員能惠予審理，並早日賜准本案設計之專利，實感得惠。
電台解密　初試啼聲
(2014-05-11)
陳韋琪
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Department of Communication and Technology
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傳播與科技學系
交大網路電台goto&Play是由三名傳播與科技系的學生所共同創立，至今已經有八年的歷史。
面試解密　小房間大故事
(2014-05-11)
王怡方
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Department of Communication and Technology
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傳播與科技學系
面試為學校驗證學生言行性格是否與書面資料相符合的過程，考生不需過度緊張但仍須準備充分及具有熱忱。