Browsing by Issue Date, starting with "2019-10-09"

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Nanocatalyst-Assisted Fine Tailoring of Pore Structure in Holey-Graphene for Enhanced Performance in Energy Storage
(2019-10-09)
Dutta, Dipak
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Jiang, Jian-Yong
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Jamaluddin, Anif
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He, Shih-Ming
;
Hung, Yu-Han
Nanoporous holey-graphene (HG) shows potential versatility in several technological fields, especially in biomedical, water filtration, and energy storage applications. Particularly, for ultrahigh electrochemical energy storage applications, HG has shown promise in addressing the issue of low gravimetric and volumetric energy densities by boosting of the ion-transport efficiency in a high-mass-loaded graphene electrode. However, there are no studies showing complete control over the entire pore architecture and density of HG and their effect on high-rate energy storage. Here, we report a unique and cost-effective method for obtaining well-controlled HG, where a copper nanocatalyst assists the predefined porosity tailoring of the HG and leads to an extraordinary high pore density that exceeds 1 x 10(3) mu m(-2). The pore architectures of the hierarchical and homogenous pores of HG were realized through a rationally designed nanocatalyst and the annealing procedure in this method. The HG electrode with a high mass loading results in improved supercapacitor performance that is at least 1 order of magnitude higher than conventional graphene flakes (reduced electrochemically exfoliated graphene (rECG)) in areal capacitance (similar to 100% retention of capacitance until 15 000 cycles), energy density, and power density. The diffusion coefficient of the HG electrode is 1.5-fold higher than that of rECG at a mass loading of 15 mg cm(-2), indicating excellent ion-transport efficiency. The excellent ion-transport efficiency of HG is further proved by nearly 4-fold magnitude lowering of its R-ion (the ionic resistance in the electrolyte-filled pores) value as compared with rECG when estimated for equivalent high-mass loaded electrodes. Furthermore, the HG exhibits a packing density that is 2 orders of magnitude higher than rECG, revealing the utility of the maximum electrode mass and possessing higher volumetric capacitance. The perfect tailoring of HG with optimized porosity allows the achievement of high areal capacitance and excellent cycling stability due to the facile ion-and charge-transport at high-mass-loaded electrodes, which could open a new avenue for addressing the long-existing issue of practical application of graphene-based energy storage devices.
Deep-Ultraviolet LEDs Fabricated by Nanoimprinting
(2019-10-09)
Horng, Ray-Hua
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Lai, Yan-Chung
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Lai, Liang-Hsing
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交大名義發表
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電子工程學系及電子研究所
In this study, deep-ultraviolet 280-nm-wavelength light-emitting diodes (DUVLEDs) with a nanopatterned sapphire substrate (NPSS) were fabricated using a nanoimprint lithography process. The output power of these flip-chip (FC) DUV LEDs was measured and analyzed in a ray-tracing simulation using NPSSs: cones with diameters of 2.5 mu m (LED1), 400 (LED2) and 200 nm (LED3) as well as holes with diameters of 350 (LED4) and 750 nm (LED5). For comparison, a mirror for the c-plane FC DUV LEDs was introduced by coating Ni/Au and Al thin films. With the injection current at 350 mA, the output powers of the c-plane, LED1, LED2, LED3, LED4, and LED5 were 13.38, 14.68, 20.05, 16.79, 15.74, and 18.93 mW, respectively. The LED2 efficiency improved 49.9% compared with mirror LED and the result was consistent with ray-tracing simulation. (C) The Author(s) 2019. Published by ECS.
Growth Promotion of Targeted Crystal Face by Nanoprocessing via Laser Ablation
(2019-10-10)
Wu, Chi-Shiun
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Ikeyama, Jun
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Nakabayashi, Seiichiro
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Sugiyama, Teruki
;
Yoshikawa, Hiroshi Y.
Control of crystal shape is an indispensable step for various applications of crystalline products. However, obtaining the desired crystal shape by conventionally tuning environmental conditions (temperature, additives, etc.) cannot always be reached. Recently, we have developed an innovative approach for spatiotemporal control of crystal growth of proteins and amino acids by locally modifying crystal structure (e.g., formation of screw dislocations) via femtosecond (fs) laser ablation. In this work, to clarify the appropriate laser condition for controlling the shape of single crystals with minimized damage, we first systematically investigated the dependence of pulse duration on laser ablation and crystal growth of L-phenylalanine (L-Phe). By using a laser system with tunable pulse durations from fs to nanoseconds (ns), we found fs laser ablation can offer nanometer-sized, sharp etching of which diameter was smaller than the diffraction limit. By utilizing such nanoprocessing via fs laser ablation for promoting the growth of a targeted crystal face, we successfully demonstrated the preparation of a bulky crystal of L-Phe, which is difficult to be obtained by conventional crystallization methods.
Spin polarization independence of hard polarized fermion string scattering amplitudes
(2019-10-10)
Lai, Sheng-Hong
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Lee, Jen-Chi
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Yang, Yi
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電子物理學系
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Department of Electrophysics
We calculate a class of polarized fermion string scattering amplitudes (PFSSA) at arbitrary mass levels. We discover that, in the hard scattering limit, the functional forms of the non-vanishing PFSSA at each fixed mass level are independent of the choices of spin polarizations. This result agrees with Gross conjecture on high energy string scattering amplitudes extended to the fermionic sector. In addition, this peculiar property of hard PFSSA is to be compared with the usual spin polarization dependence of the hard polarized fermion field theory scatterings. (C) 2019 The Author(s). Published by Elsevier B.V.
總編輯的話
(2019-10-13)
沈品妤
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Department of Communication and Technology
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傳播與科技學系
本期為喀報319期，共計12篇文章，包含9篇藝文評論、1篇人物特寫，1篇科技新知，1篇社會議題。本期藝文評論類目內容豐富多彩，有電影評論、日劇解說與偶像團體介紹，展現多元的面貌。
《指定倖存者》真的是最適合的人選嗎？
(2019-10-13)
陳婉宣
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Department of Communication and Technology
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傳播與科技學系
當你是最後倖存的那個人，你會怎麼做？當你不是大家心目中最理想的候選人時，你該怎麼做？又該如何證明自己？本文將探討美劇《指定倖存者》所帶來的議題，分析其角色設定及劇情編排。
被罪吞噬，就沒有能被一筆勾銷的記憶
(2019-10-13)
吳宥芯
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Department of Communication and Technology
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傳播與科技學系
公視再度投出震撼彈－《噬罪者》，探討更生人重新踏回社會生活所遇到的種種不適應，以及如何在其中找回自己的價值。
病態社會下的勇敢我要準時下班
(2019-10-13)
王會瑄
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Department of Communication and Technology
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傳播與科技學系
「時間到了，我要下班了！」生活中，有多少人能坦然地說出這句話？準時上班、準時下班，本應是理所當然的一件事，爲何我們總會畏懼別人的眼光，害怕被認爲不認真，不上進，沒有責任心呢？日劇《我要準時下班》，跟著性格溫柔卻勇敢堅守私人時間的東山結衣一起對抗不合理的職場價值觀！
Use High-Flow Nasal Cannula for Acute Respiratory Failure Patients in the Emergency Department: A Meta-Analysis Study
(2019-10-13)
Huang, Cheng-Chieh
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Lan, Hao-Min
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Li, Chao-Jui
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Lee, Tsung-Han
;
Chen, Wen-Liang
Objective. To evaluate the efficacy of high-flow nasal cannula (HFNC) therapy compared with conventional oxygen therapy (COT) or noninvasive ventilation (NIV) for the treatment of acute respiratory failure (ARF) in emergency departments (EDs). Method. We comprehensively searched 3 databases (PubMed, EMBASE, and the Cochrane Library) for articles published from database inception to 12 July 2019. This study included only randomized controlled trials (RCTs) that were conducted in EDs and compared HFNC therapy with COT or NIV. The primary outcome was the intubation rate. The secondary outcomes were the mortality rate, intensive care unit (ICU) admission rate, ED discharge rate, need for escalation, length of ED stay, length of hospital stay, and patient dyspnea and comfort scores. Result. Five RCTs (n = 775) were included. There was a decreasing trend regarding the application of HFNC therapy and the intubation rate, but the difference was not statistically significant (RR, 0.53; 95% CI, 0.26-1.09; p=0.08; I-2 = 0%). We found that compared with patients who underwent COT, those who underwent HFNC therapy had a reduced need for escalation (RR, 0.41; 95% CI, 0.22-0.78; p=0.006; I-2 = 0%), reduced dyspnea scores (MD -0.82, 95% CI -1.45 to -0.18), and improved comfort (SMD -0.76 SD, 95% CI -1.01 to -0.51). Compared with the COT group, the HFNC therapy group had a similar mortality rate (RR, 1.25; 95% CI, 0.79-1.99; p=0.34; I-2 = 0%), ICU admission rate (RR, 1.11; 95% CI, 0.58-2.12; p=0.76; I-2 = 0%), ED discharge rate (RR, 1.04; 95% CI, 0.63-1.72; p=0.87; I-2 = 0%), length of ED stay (MD 1.66, 95% CI -0.95 to 4.27), and hospital stay (MD 0.9, 95% CI -2.06 to 3.87). Conclusion. Administering HFNC therapy in ARF patients in EDs might decrease the intubation rate compared with COT. In addition, it can decrease the need for escalation, decrease the patient's dyspnea level, and increase the patient's comfort level compared with COT.
《AV帝王》挑戰日劇最大尺度
(2019-10-13)
施詞萱
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Department of Communication and Technology
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傳播與科技學系
促成現今日本色情產業蓬勃，且改變了成人產業的關鍵點，就必須從日劇《AV帝王》中的知名色情片鬼才村西透，這個傳奇男人的一生說起。
不想痛就要動走路預防牙周病
(2019-10-13)
陳千柔
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Department of Communication and Technology
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傳播與科技學系
還坐在家裡看書、打電動、發呆嗎？趕快起來動一動吧！牙周病會就此遠離你喔！
99%蘭嶼的故事《只有大海知道》
(2019-10-13)
曾冠霖
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Department of Communication and Technology
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傳播與科技學系
對你來說，蘭嶼是一個什麼樣的地方？是台灣的角落？反核的最前線？還是山海交融的美麗島嶼？通過崔永徽導演的《只有大海知道》，萃取出蘭嶼最真實的面貌，展現出最「蘭嶼」的故事。
Uber行不行？目前沒問題！
(2019-10-13)
林怡恩
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Department of Communication and Technology
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傳播與科技學系
Uber自2013年進軍台灣後備受爭議，甚至歷經中途退出又重返台灣市場，法條也是一改再改，民眾對於其合法性茫然無措。Uber在台灣到底經歷了些什麼事？而今年（2019年）10月《新Uber條款》上路，對Uber及消費者又會有什麼影響？
社群時代的悲歌 ——《黑鏡：碎片》
(2019-10-13)
陳姝芸
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Department of Communication and Technology
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傳播與科技學系
睽違許久，Netflix高人氣影集《黑鏡》第五季終於在今年6月5日推出。其中，第二集《碎片》更被譽為第五季最有可看性的一部。這一集，科技與人性又能碰撞出什麼樣的火花呢？
環遊世界只為了找到家　新加坡女孩的尋鄉之路
(2019-10-13)
李芝謙
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Department of Communication and Technology
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傳播與科技學系
你有獨自旅行的經驗嗎？如果給你一個機會，踏上一場沒有終點的旅行，你會成為自由瀟灑的風，還是隨波而流的浮萍？一個新加坡女孩花了365天，走遍世界的角落。是什麼讓她願意不計後果，開啟一場名為「流浪」的旅程。
從電影《灼人秘密》中，你發現了幾個秘密呢?
(2019-10-13)
曾弘碩
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Department of Communication and Technology
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傳播與科技學系
電影《灼人秘密》由導演趙德胤編導，故事帶出演藝圈光鮮亮麗背後持續發酵的黑暗面，和浸染其中的受害者被潛規則後，精神經歷創傷的過程。
來自黑羊的吶喊－不一樣的偶像團體「欅坂46」
(2019-10-13)
蕭蕙崎
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Department of Communication and Technology
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傳播與科技學系
日本女子偶像團體－欅坂46於2019年2月發行了第八張單曲《黒い羊》（台譯黑羊），不管是歌曲或是舞台表演本身都引起了很大的關注。
Triplet vs pi sigma* state mediated N-H dissociation of aniline
(2019-10-14)
Jhang, Wan Ru
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Lai, Hsin Ying
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Lin, Yen-Cheng
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Lee, Chin
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Lee, Shih-Huang
UV-excited aromatic molecules with N-H/O-H moieties often possess an important nonradiative relaxation pathway, from an optically bright pi pi* state to a dark dissociative pi sigma* state. We apply a new time-selected photofragment translational spectroscopy method to disclose a previously unknown triplet-mediated N-H dissociation of aniline prevented by the multiphoton dissociative ionization in conventional methods. We further determined the branching fractions of aniline dissociated in the pi sigma*, triplet, and ground states at 248 nm. Additionally, we selectively captured the population changes in the singlet and triplet states with ionization from different laser wavelengths, 355 or 266 nm, in time-resolved photoion yields. The combination of experimental data enables us to uniquely determine the relative ionization cross sections of the singlet and triplet states at an ionization laser wavelength of 266 nm and allows us to extensively measure the rate constants of intersystem crossing and the branching fractions at various excitation wavelengths. Published under license by AIP Publishing.
Using logistic regression classification for mitigating high noise-ratio advisement light-panel in rolling-shutter based visible light communications
(2019-10-14)
Chuang, Yu-Cheng
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Chow, Chi-Wai
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Liu, Yang
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Yeh, Chien-Hung
;
Liao, Xin-Lan
We propose and experimentally demonstrated a light-panel and image sensor based visible light communication (VLC) system using machine learning (ML) algorithm. The ML algorithm is compared with the traditional demodulation scheme and the experimental results show that even at very high noise-ratio (NR) light-panel display content, the proposed ML algorithm shows significant bit error rate (BER) improvement. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Detailed mechanism and kinetics of the reaction of Criegee intermediate CH2OO with HCOOH investigated via infrared identification of conformers of hydroperoxymethyl formate and formic acid anhydride
(2019-10-14)
Chung, Chen-An
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Su, Jou Wei
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Lee, Yuan-Pern
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交大名義發表
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應用化學系
The reaction of Criegee intermediate CH2OO with HCOOH is important in atmospheric chemistry, but its mechanism and kinetics are little investigated. We recorded time-resolved infrared absorption spectra of transient species produced upon irradiation at 308 nm of a flowing mixture of CH2I2/O-2/N-2/HCOOH at 298 K. Bands of CH2OO were observed initially upon irradiation; their decrease was accompanied with the appearance of several bands near 887, 925, 1052, 1115, 1170, 1342, 1391, and 1760 cm(-1), assigned to the absorption of hydroperoxymethyl formate [HC(O)OCH2OOH, HPMF], that decreased in intensity at a later period with the appearance of absorption bands of the anti-conformer of formic acid anhydride [anti-(HCO)(2)O, FAN] near 998, 1101, 1767, and 1821 cm(-1). The main contributions of the infrared absorption of HPMF are from an open-form conformer, but small contributions from the intramolecular hydrogen-bonded conformer that absorbs near 1070, 1170, and 1732 cm(-1) were identified. Observed infrared spectra of both conformers of HPMF and anti-FAN agree satisfactorily with the anharmonic vibrational wavenumbers and IR intensities predicted with the B3LYP/aug-cc-pVTZ method. We derived a rate coefficient for CH2OO + HCOOH to be k = (1.4 +/- 0.3) x 10(-10) cm(3) molecule(-1) s(-1) from formation of HPMF. We found also that anti-FAN was produced mainly from the open-form conformer with rate coefficient k = (1460 +/- 30) s(-1); the intramolecular hydrogen-bonded conformer of HPMF is stable.