Browsing by Issue Date, starting with "2016-03-07"

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交大e-News第204期-IBM攜手交通大學培育大數據分析人才
(2016-03-07)
國立交通大學秘書室
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Secretariat
Plasmonic behaviors of metallic AZO thin film and AZO nanodisk array
(2016-03-07)
Lin, Jia-Yu
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Zhong, Kun-Da
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Lee, Po-Tsung
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光電工程學系
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光電工程研究所
Aluminum-doped zinc oxide (AZO) is well known as transparent conducting material for electro-optical devices, but is rarely used as plasmonic material, particularly on the localized surface plasmon resonance (LSPR) behavior of AZO nanostructure and its plasmonic devices. In this study, we systematically investigate the plasmonic behaviors of AZO thin films and patterned AZO nanostructures with various structural dimensions under different annealing treatments. We find that AZO film can possess highly-tunable, metal-like, and low-loss plasmonic property and the LSPR characteristic of AZO nanostructure is observed in the near-infrared (NIR) region under proper annealing conditions. Finally, environmental index sensing is performed to demonstrate the capability of AZO nanostructure for optical sensing application. High index sensitivity of 873 nm per refractive index unit (RIU) variation is obtained in experiment. (C) 2016 Optical Society of America
Optical design for a see-through head-mounted display with high visibility
(2016-03-07)
Zhao, Kai-Wei
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Pan, Jui-Wen
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光電系統研究所
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照明與能源光電研究所
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Institute of Photonic System
An optical design for a see-through head-mounted display with high visibility is described. This design, which is based on a light guide plate with triangular microstructures, can overcome the limitations of the balance in optical efficiency. The optical efficiency of the virtual image can be larger than the optical efficiency of the real image, which ensures high visibility. The visibility can be increased to 22 with this design, much higher than the visibility possible with previous designs for a see-through head-mounted display, making this suitable for daily application. (C) 2016 Optical Society of America
Heavy-flavor-conserving hadronic weak decays of heavy baryons
(2016-03-07)
Cheng, Hai-Yang
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Cheung, Chi-Yee
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Lin, Guey-Lin
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Lin, Yeu-Chung
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Yan, Tung-Mow
More than two decades ago, we studied heavy-flavor-conserving weak decays of heavy baryons within the framework that incorporates both heavy-quark and chiral symmetries. In view of the first observation of Xi(-)(b) -> Lambda(0)(b)pi(-) by LHCb recently, we have reexamin Xi(-)(b) -> Lambda(0)(b)pi(-) in the MIT bag and diquark models are consistent with experiment. The major theoretical uncertainty stems from the evaluation of baryon matrix elements. The branching fraction of Xi(c)-> Lambda(c)pi is predicted to be of order 10(-4). It is suppressed relative to B(Xi(b) -> Lambda(b)pi) owing to the shorter lifetime of Xi(c) relative to Xi(b) and the destructive nonspectator W-exchange contribution. The kinematically accessible weak decays of the sextet heavy baryon Omega(Q) are Omega(Q) -> Xi(Q)pi. Due to the absence of the B-6 - B-(3) over bar transition in the heavy quark limit and the B-6 - B-6 transition in the model calculations, Omega(Q) -> Xi(Q)pi vanish in the heavy quark limit.
Novel porphyrin-preparation, characterization, and applications in solar energy conversion
(2016-03-07)
Lu, Jianfeng
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Li, Hao
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Liu, Shuangshuang
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Chang, Yu-Cheng
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Wu, Hui-Ping
Porphyrins have been demonstrated as one of the most efficient sensitizers in dye-sensitized solar cells (DSSC). Herein, we investigated a series of porphyrin sensitizers functionalized with various pi-spacers, such as phenyl for LD14, thiophene for LW4, thiophene-phenyl for LW5, and 2,1,3-benzothiadiazole (BTD)-phenyl for LW24. Photo-physical investigation by means of time-resolved fluorescence and nanosecond transient absorption spectroscopy revealed an accelerated inner charge transfer in porphyrins containing the BTD-phenyl pi-spacer. Implementation of an auxiliary electron-deficient BTD unit to the porphyrin spacer also results in a broad light-harvesting ability extending up to 840 nm, contributing to an enhanced charge transfer character from the porphyrin ring to the anchoring group. When utilized as a sensitizer in DSSCs, the LW24 device achieved a power conversion efficiency of 9.2%, higher than those based on LD14 or LW5 porphyrins (PCE 9.0% or 8.2%, respectively) but lower than that of the LW4 device (PCE 9.5%). Measurements of transient photovoltage decays demonstrate that the LW24 device features the up-shifted potential band edge of the conduction band of TiO2, but involves serious charge recombination in the dye/TiO2 interface. The findings provide insights into the molecular structure and the charge-transfer characteristics for designing efficient porphyrin sensitizers for DSSC applications.
THz emission from organic cocrystalline salt: 2, 6-diaminopyridinium-4-nitrophenolate-4-nitrophenol
(2016-03-07)
Tu, Chien-Ming
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Chou, Li-Hsien
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Chen, Yi-Cheng
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Huang, Ping
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Rajaboopathi, M.
We report few-cycle THz pulses emission from a novel organic crystal 2,6-diaminopyridinium-4-nitrophenolate-4-nitrophenol (DAP(+)NP(-)NP). The observed amplitude of the THz electric field from a DAP(+)NP(-)NP crystal is comparable with that from a ZnTesingle crystal under the same optical pumping conditions. Both the waveform and spectra of the THz radiation from DAP(+)NP(-)NP are similar to those from ZnTe. We conclude that a high quality DAP(+)NP(-)NP crystal would be a high potential candidate in THz generation and applications. (C) 2016 Optical Society of America
The Efficacy of Acupuncture in Post-Operative Pain Management: A Systematic Review and Meta-Analysis
(2016-03-09)
Wu, Ming-Shun
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Chen, Kee-Hsin
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Chen, I-Fan
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Huang, Shihping Kevin
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Tzeng, Pei-Chuan
Background Postoperative pain resulting from surgical trauma is a significant challenge for healthcare providers. Opioid analgesics are commonly used to treat postoperative pain; however, these drugs are associated with a number of undesirable side effects. Objective This systematic review and meta-analysis evaluated the effectiveness of acupuncture and acupuncture-related techniques in treating postoperative pain. Data Source MEDLINE, Cochrane Library, and EMBASE databases were searched until Sep 30, 2014. Study Eligibility Criteria Randomized controlled trials of adult subjects (>= 18 years) who had undergone surgery and who had received acupuncture, electroacupuncture, or acupoint electrical stimulation for managing acute post-operative pain were included. Results We found that patients treated with acupuncture or related techniques had less pain and used less opioid analgesics on Day 1 after surgery compared with those treated with control (P < 0.001). Sensitivity analysis using the leave-one-out approach indicated the findings are reliable and are not dependent on any one study. In addition, no publication bias was detected. Subgroup analysis indicated that conventional acupuncture and transcutaneous electric acupoint stimulation (TEAS) were associated with less postoperative pain one day following surgery than control treatment, while electroacupuncture was similar to control (P = 0.116). TEAS was associated with significantly greater reduction in opioid analgesic use on Day 1 post surgery than control (P < 0.001); however conventional acupuncture and electroacupuncture showed no benefit in reducing opioid analgesic use compared with control (P >= 0.142). Conclusion Our findings indicate that certain modes of acupuncture improved postoperative pain on the first day after surgery and reduced opioid use. Our findings support the use of acupuncture as adjuvant therapy in treating postoperative pain.
Dielectric Engineering of a Boron Nitride/Hafnium Oxide Heterostructure for High-Performance 2D Field Effect Transistors
(2016-03-09)
Zou, Xuming
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Huang, Chun-Wei
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Wang, Lifeng
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Yin, Long-Jing
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Li, Wenqing
A unique design of a hexagonal boron nitride (h-BN)/HfO2 dielectric heterostructure stack is demonstrated, with few-layer h-BN to alleviate the surface optical phonon scattering, followed by high-kappa HfO2 deposition to suppress Coulombic impurity scattering so that high-performance top-gated two-dimensional semiconductor transistors are achieved. Furthermore, this dielectric stack can also be extended to GaN-based transistors to enhance their performance.
Optical properties of one- and two-dimensional excitons in m-plane ZnO/MgZnO multiple quantum wells
(2016-03-09)
Chen, H. R.
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Tsai, C. Y.
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Huang, Y. C.
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Kuo, C. C.
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Hsu, H. C.
Five pairs of ZnO/Zn0.9Mg0.1O multiple quantum wells (MQWs) with fixed barrier thickness of 55 nm and three well widths of 4, 8 and 16 nm have been grown on m-plane sapphires by pulsed laser deposition. Due to 2D quantum confinement with decreasing well width, the emission of excitons bound to the basal-plane stacking faults, which are one-dimensionally confined in MQWs, encounters larger blue shift than that of the near-band edge excitons. Furthermore, remarkably reducing coupling of free excitons with A1 longitudinal optical phonons is closely correlated with increasing exciton binding energy but enhanced coupling of E-2-low phonons is a result of increasing interaction with the interface phonons with decreasing well width.
Picosecond Motional Relaxation of Nanoparticles in Femtosecond Laser Trapping
(2016-03-10)
Muramatsu, Masayasu
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Shen, Tse-Fu
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Chiang, Wei-Yi
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Usman, Anwar
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Masuhara, Hiroshi
Repetitive drag and release dynamics by impnlsive force is characteristic of optical trapping by femtosecond laser pulses. We studied the dynamics utilizing double pulse train and found that trapped polystyrene particles are ejected repetitively from the focal spot and its frequencies become less for longer interval of the pulse trains. The ejection changes drastically in a few-ps interval region, although particles cannot move appreciable distance in such a short time. It means that displacement of particles by a conventional diffusive motion is not dominant and another fast process has an important role in femtosecond pulse trapping. We also revealed that the silica nanoparticles shows a decay at few-ps, indicating that the picosecond decay is not due to a material property but considered to be a general dynamics. We propose that a picosecond relaxation process of inertia force of particles is important for understanding laser trapping dynamics by femtosecond laser pulses.
Optimization of a guided-mode resonance filter by varying the thickness of the buffer layer
(2016-03-10)
Hsu, Hsiang I.
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Wu, Po-Tsung
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Huang, Cheng-Sheng
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機械工程學系
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Department of Mechanical Engineering
In this Letter, we demonstrate that by adjusting the thickness of the buffer layer, the optical responses of a guided-mode resonance filter (GMRF) can be improved for sensor applications. The GMRF is fabricated using a replica molding with a plastic substrate and a UV-curable polymer. SiO2 buffer layers of different thicknesses are deposited before the waveguide-layer deposition. The sensitivity of the GMRFs decreasds slightly with-increasing SiO2 layer thickness. By contrast, the full width at half-maximum reduces substantially with increasing SiO2 layer thickness, resulting in the improvement of the overall figure of merit.
Live無邊界　實況浪潮來襲
(2016-03-13)
吳偉立
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Department of Communication and Technology
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傳播與科技學系
簡述實況的概況，並且分析台灣觀看實況的情形。
熟男熟女　越老越美麗
(2016-03-13)
謝萱穎
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Department of Communication and Technology
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傳播與科技學系
社會大眾面對老化大多抱持抗拒、逃避的態度，因為無法對「變老」感同身受，反而因此衍生更多對熟齡的傷害。
「紫爆」來襲　空汙知多少
(2016-03-13)
鄭宇茹
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Department of Communication and Technology
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傳播與科技學系
空氣汙染影響的不只是我們的活動，還有健康，關注相關議題找出保護自己也保護環境的方法。
Fabrication of titanate nanotube-supported carbon-zerovalent iron nanocomposites for enhanced dechlorination of tricholoroethyelen
(2016-03-13)
Doong, Ruey-An
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Tsou, Feng-Ju
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環境工程研究所
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Institute of Environmental Engineering
Efficiently controllable hybrid micelle of poly(3-adeninehexylthiophene)/[6,6]-phenyl-C61-butyric acid methyl ester for a flexible metal-insulator-semiconductor device
(2016-03-13)
Lin, Yen-Ting
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Singh, Ranjodh
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Ko, Fu-Hsiang
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Cheng, Chih-Chia
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材料科學與工程學系
創意無限　玩轉手中程式
(2016-03-13)
楊淑斐
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Department of Communication and Technology
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傳播與科技學系
介紹應用程式的製作流程。
時隔半世紀　殺戮演繹
(2016-03-13)
翁世樺
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Department of Communication and Technology
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傳播與科技學系
一九六五的印尼九三〇事件震驚全球，五十萬人遭到殘忍屠殺。【殺戮演繹】讓世人重新檢視這件慘案。
進擊媒體　敘述方式進化
(2016-03-13)
劉敏慈
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Department of Communication and Technology
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傳播與科技學系
媒體從媒材、內容及產製進行優化，作者更必須思考讀者閱讀的情況，網路時代讓說故事的方式有更多可能。
塑膠垃圾　海生破壞
(2016-03-13)
馮鈞鈺
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Department of Communication and Technology
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傳播與科技學系
每年約有八百萬噸的塑膠垃圾流入海中，不只破壞環境，也造成許多海洋生物誤食而死亡。