Browsing by Issue Date, starting with "2019-05-21"

Now showing 1 - 20 of 7573

Full proximity treatment of topological superconductors in Josephson-junction architectures
(2019-05-21)
Setiawan, F.
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Wu, Chien-Te
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Levin, K.
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電子物理學系
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Department of Electrophysics
Experiments on planar Josephson-junction architectures have recently been shown to provide an alternative way of creating topological superconductors hosting accessible Majorana modes. These zero-energy modes can be found at the ends of a one-dimensional channel in the junction of a two-dimensional electron gas (2DEG) proximitized by two spatially separated superconductors. The channel, which is below the break between the superconductors, is not in direct contact with the superconducting leads, so that proximity coupling is expected to be weaker and less well controlled than in the simple nanowire configuration widely discussed in the literature. This provides a strong incentive for this paper which investigates the nature of proximitization in these Josephson-junction architectures. At a microscopic level we demonstrate how and when it can lead to topological phases. We do so by going beyond simple tunneling models through solving self-consistently the Bogoliubov-de Gennes equations of a heterostructure multicomponent system involving two spatially separated s-wave superconductors in contact with a normal Rashba spin-orbit-coupled 2DEG. Importantly, within our self-consistent theory we present ways of maximizing the proximity-induced superconducting gap by studying the effect of the Rashba spin-orbit coupling, chemical potential mismatch between the superconductor and 2DEG, and sample geometry on the gap. Finally, we note (as in experiment) a Fulde-Ferrell-Larkin-Ovchinnikov phase is also found to appear in the 2DEG channel, albeit under circumstances which are not ideal for the topological superconducting phase.
Carbonaceous Anodes Derived from Sugarcane Bagasse for Sodium-Ion Batteries
(2019-05-21)
Rath, Purna Chandra
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Patra, Jagabandhu
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Huang, Hao-Tzu
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Bresser, Dominic
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Wu, Tzi-Yi
To realize the sustainability of Na-ion batteries (NIBs) for large-scale energy storage applications, a resource-abundant and cost-effective anode material is required. In this study, sugarcane bagasse (SB), one of the most abundant types of biowaste, is chosen as the carbon precursor to produce a hard carbon (HC) anode for NIBs. SB has a great balance of cellulose, hemicellulose, and lignin, which prevents full graphitization of the pyrolyzed carbon but ensures a sufficiently ordered carbon structure for Na+ transport. Compared with HC derived from waste apples, which are pectin-rich and have less cellulose than SB, SB-derived HC (SB-HC) has fewer defects and a lower oxygen content. SB-HC thus has a higher first-cycle sodiation/desodiation coulombic efficiency and better cycling stability. In addition, SB-HC has a unique flake-like morphology, which can shorten the Na+ diffusion length, and higher electronic conductivity (owing to more sp(2)-hybridized carbon), resulting in superior high-rate charge-discharge performance to apple-derived HC. The effects of pyrolysis temperature on the material characteristics and electrochemical properties, evaluated by using chronopotentiometry, cyclic voltammetry, and electrochemical impedance spectroscopy, are systematically investigated for both kinds of HC.
Gold nanocluster-based fluorescence sensing probes for detection of dipicolinic acid
(2019-05-21)
Baig, Mirza Muhammad Fahad
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Chen, Yu-Chie
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應用化學系
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Department of Applied Chemistry
Bacillus spp. are spore-forming bacteria, and some of them, including Bacillus cereus and Bacillus anthracis, are pathogens. Dipicolinic acid (DPA) has been recognized as a biomarker for spore-forming bacteria. Thus, developing rapid sensing methods to spot the presence of DPA in suspicious samples is significant. In this study, we employ complexes of glutathione-capped gold nanoclusters (Au@GSH NCs) with Cu2+ as sensing probes against DPA. Au@GSH NCs possess orange-reddish fluorescence. However, their fluorescence is significantly quenched in the presence of Cu2+. In the presence of DPA, the fluorescence of Au@GSH NCs can be restored because DPA can easily remove Cu2+ on the NCs through chelation based on the high formation constant (log K = 7.97) between Cu2+ and DPA. Therefore, on the basis of this fact, Au@GSH NC-Cu2+ complexes are used as turn-on fluorescence probes against DPA. Unlike most of the existing sensing methods, the developed Au@GSH-Cu2+-based sensing method is not affected by the presence of phosphates, which can be commonly found in real samples. The limit of detection of using the developed sensing method toward DPA can reach as low as -19nM. In addition, we also demonstrate the feasibility of using the developed sensing method for detection and quantification of DPA in soil samples and B. cereus spore lysates.
Implementation of a 900 V Switching Circuit for High Breakdown Voltage beta-Ga2O3 Schottky Diodes
(2019-05-22)
Chen, Yen-Ting
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Yang, Jiancheng
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Ren, Fan
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Chang, Chin-Wei
;
Lin, Jenshan
This paper presents a switching circuit for high breakdown-voltage Ga2O3 vertical Schottky rectifiers. Field-plated edge-terminated (FPET) vertical Schottky diodes were fabricated on a 20-mu m thick Si-doped n-type Ga2O3 drift layer which was grown on the 650-mu m thick beta-Ga2O3 substrate via halide vapor phase epitaxy (HVPE). The measured reverse recovery time of the proposed Ga2O3 Schottky diode was 81 ns when switched to a reverse bias voltage of -900 V. The implementation of a switching circuit with the novel Ga2O3 diode is the first demonstrated at such a high switching voltage. This paper also provides insights for the practical implementation of the Ga2O3 vertical Schottky rectifiers from device fabrication to circuit design. (C) The Author(s) 2019. Published by ECS.
Effect of an External Electric Field on the Fluorescence of a pi-Conjugated Polymer Film of P3HT Sandwiched between FTO and PMMA Published as part of The Journal of Physical Chemistry virtual special issue "Hai-Lung Dai Festschrift"
(2019-05-23)
Awasthi, Kamlesh
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Chiou, Chin-Shiun
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Iimori, Toshifumi
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Diau, Eric Wei-Guang
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Ohta, Nobuhiro
We report the photoexcitation dynamics of poly(hexylthiophene-2,5-diyl) (P3HT) as a solid film sandwiched between conducting films of a fluorine-doped tin-oxide-coated glass substrate (FTO) and an insulator film of poly(methyl methacrylate) (PMMA), from measurements of the effects of an external electric field on the absorption and photoluminescence (PL) spectra of P3HT. An Ag film was coated on the PMMA film; the FTO and Ag films served as electrodes to apply an external electric field to P3HT. According to the effects of a quadratic electric field, the lifetime of the emitting state of P3HT increased in the presence of that external field, resulting in an enhanced fluorescence quantum yield. An enhancement and quenching of fluorescence were observed also on applying an external electric field having the opposite polarity to the P3HT film between FTO and Ag films, which results from a field-induced change of both the population of the emitting state following photoexcitation and the rate of nonradiative decay at the emitting state. The dependence of the field-induced change of photoluminescence on the polarity of the applied external electric field between the FTO and Ag films was interpreted as an influence of an internal field located in the P3HT film sandwiched between FTO and PMMA films. These results of the effects of an electric field on the PL of a P3HT film sandwiched between FTO and PMMA films are compared with the effects on PL of P3HT sandwiched between a semiconductor film of TiO2 or a Sb2S3 film and a PMMA film.
電視劇影響想婚意願？單身女性現身說法
(2019-05-26)
王允姸
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Department of Communication and Technology
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傳播與科技學系
【單身化社會：單身女性何去何從】專題

最近出了許多甜甜的青春電視劇，劇中塑造婚後的劇情是否對單身女性想婚意願產生影響？單身女性現身說法！
日韓偶像大PK
(2019-05-26)
蘇嘉薇
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卓瑋哲
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Department of Communication and Technology
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傳播與科技學系
大家對於日韓兩國偶像文化，有什麼看法呢？日本偶像還是韓國偶像比較受大家喜愛呢？一起來看看吧！
養成系v.s.實力派　Produce 48日韓大戰
(2019-05-26)
郭玟妤
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Department of Communication and Technology
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傳播與科技學系
你哈韓還是哈日？韓國人氣選秀節目《PRODUCE 101》搭上日本AKB48集團，《PRODUCE 48》實力派和養成系的對決就此展開！
日系韓系風格大PK
(2019-05-26)
李庭安
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Department of Communication and Technology
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傳播與科技學系
日系韓系傻傻分不清楚？沒關係，本期專題（女性藝人為例，日本以AKB48為代表）從風格、制度、營運，一次傳授，快來看看日系韓系風格大PK吧！
惡作劇之　吻的魅力分析
(2019-05-26)
林函諭
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Department of Communication and Technology
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傳播與科技學系
【「漫改」漫畫改編真人的感情世界】專題

《惡作劇之吻》風靡亞洲，多國進行改編。究竟《惡作劇之吻》如此盛行的原因是什麼呢？
交清美食特輯　五家必吃銅板美食
(2019-05-26)
黃齡萱
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Department of Communication and Technology
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傳播與科技學系
交清兩校周邊美食特輯，距離交大清大最近的美食聖地就是──清大夜市，跟著喀報來一探究竟！
生活由「你訂」！
(2019-05-26)
許家芸
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Department of Communication and Technology
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傳播與科技學系
「沒有人是生來就想創業的，都是因為有一個點、一個不爽、一個衝動，才會想創業。」今天讓我們跟著你訂的創辦人陳伯宇，一起來看看新創公司——雲仲資訊，一路走來的心路歷程。
總編輯的話
(2019-05-26)
洪蜜禪
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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316期，共計十二篇文章，包含1篇本期專題、5篇文化現象、3篇影音新聞、1篇人物特寫、1篇藝文評論、1篇遊戲評論。本期專題「偶愛偶像　日韓偶像文化探討」，帶你深入了解偶像的秘辛。
讓程式變得有趣！　拓可思科創
(2019-05-26)
梁書瑜
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許可晴
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Department of Communication and Technology
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傳播與科技學系
拓可思科創和交大產學中心合作，以視覺化、圖像化、實體化的方式引導小朋友在學習程式時能不感到害怕和陌生，藉此激發小朋友的學習動機。
當黑暗降臨　「遊」鬱症的世界
(2019-05-26)
呂奕廷
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Department of Communication and Technology
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傳播與科技學系
《第九藝術的綻放：獨立遊戲》專題

今年（2019）3月由Sirhaian一人獨立開發出的《當黑暗降臨（When the darkness comes）》試圖塑造憂鬱症患者眼中的世界，讓玩家以第一人稱的視角體驗。
極簡宿舍改造計畫
(2019-05-26)
林芷懷
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Department of Communication and Technology
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傳播與科技學系
【極簡生活修練題】專題

維持宿舍簡單乾淨或許是不少學生的難題，把「斷」、「捨」、「離」的概念實際帶進大學宿舍又會產生什麼樣的火花呢？
奇特網購經驗大排行
(2019-05-26)
殷顗霖
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Department of Communication and Technology
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傳播與科技學系
【網路時代「購」不夠？了解知識一起GO！】專題

網購雖然方便，有時卻會出現哭笑不得的情形。就讓我們來看看那些最瞎、最狂、最無言的網購經驗吧！
演技真人秀熱潮　反思演員定義
(2019-05-26)
陳盈璇
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Department of Communication and Technology
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傳播與科技學系
【演員的挑戰】專題
演員究竟是什麼？以《演員的誕生》、《聲臨其境》等競技類演技真人秀的出現，來討論演員的現狀。
甜蜜的負荷　凌度C後援會
(2019-05-26)
卓瑋哲
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Department of Communication and Technology
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傳播與科技學系
【2019愛凌依舊　甜蜜天后王心凌】專題

只要有王心凌出現的地方，一定有一群粉絲會到場力挺，其中有從出道就喜歡王心凌的人、有中途才加入的，也有近年新增的成員，團結一致只為了讓王心凌感受到滿滿的應援，他們是凌度C。
遇見你的真心　節目中的愛情觀
(2019-05-26)
蔡佳妤
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Department of Communication and Technology
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傳播與科技學系
【現實與幻想之間的「愛」】專題

透過分析中國的戀愛實境秀節目—《遇見你真好》，探討在節目中呈現的愛情觀。