Browsing by Issue Date, starting with "2018-01-21"

Now showing 1 - 20 of 11417

Laser co-ablation of bismuth antimony telluride and diamond-like carbon nanocomposites for enhanced thermoelectric performance
(2018-01-21)
Chen, Tsung-Han
;
Chen, Po-Hung
;
Chen, Chun-Hua
;
材料科學與工程學系
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Department of Materials Science and Engineering
A novel design of thermoelectric hetero-nanocomposite films comprising well-aligned oriented (Bi,Sb)(2)Te-3 (BST) nanocrystals and randomly dispersed diamond-like carbon (DLC) clusters has been realized for the first time using dual-beam pulsed laser co-deposition on SiO2 insulated Si substrates. The simultaneously deposited DLC additives were found not only to successfully prevent the thermally induced rapid growth of BST for having consistent nanostructures across the whole BST: DLC film, but also to effectively reduce the thermal transport as qualitatively evidenced by micro-Raman characterizations. The significantly enhanced Seebeck coefficients up to 550 mV K-1 and the corresponding power factor of similar to 46 mu W cm(-1) K-2 revealed comparable to or higher than previously reported values for BST or BSTbased nanocomposites, which evidently originated from the presence of multiple BST:DLC heterointerfaces as clarified in the Pisarenko plot.
Real-time CRP detection from whole blood using micropost-embedded microfluidic chip incorporated with label-free biosensor
(2018-01-21)
Tsai, Meng-Zhe
;
Hsiung, Chan-Te
;
Chen, Yang
;
Huang, Cheng-Sheng
;
Hsu, Hsin-Yun
We demonstrate the detection of C-creative protein (CRP) from whole blood samples without sample pretreatment by using a lab-on-a-chip system consisting of a microfluidic chip and a label-free biosensor. The microfluidic chip includes an array of microposts for filtering blood cells and allows only plasma to flow through and reach the guided-mode resonance (GMR) biosensor for real-time monitoring. The developed GMR sensor can achieve a bulk sensitivity of 186 nm RIU-1, which supports a limit of detection of 3.2 ng mL(-1) for recombinant CRP spiked in human serum. The results are comparable with those obtained using enzyme-linked immunosorbent assay. In addition, we demonstrate the efficacy of filtration of blood cells using microposts and simultaneous measurement of CRP concentration using a GMR sensor by using whole blood and plasma samples.
交大e-News第248期-交通大學與國家中山科學研究院打造產業一條龍團隊發展國防科技與通訊技術
(2018-01-22)
國立交通大學秘書室
;
Secretariat
Uplink performance enhancement for LTE licensed-assisted access to unlicensed spectrum
(2018-01-22)
Tsai, Cheng-Jie
;
Lee, Tsern-Huei
;
電機工程學系
;
Department of Electrical and Computer Engineering
Licensed-assisted access (LAA) is a new operation mode of carrier aggregation for the Long Term Evolution Advanced systems to transmit data on both licensed and unlicensed spectrum. To deal with the issue of co-existence with WiFi systems, LAA is required to perform listen-before-talk, which can significantly impact its resource utilization. In this paper, the concept called multi-subframe scheduling (MSS) which can enhance the performance of uplink LAA data transmission is presented. MSS allows a user equipment to have multiple channel sensing opportunities and/or to transmit data continuously for multiple subframes. Both scheduling-based and random access schemes are evaluated and compared. The optimum configuration of MSS which maximizes resource utilization of LAA is also provided. Numerical results show that MSS improves resource utilization on the unlicensed spectrum significantly.
Monolithic integration of GaN-based light-emitting diodes and metal-oxide-semiconductor field-effect transistors: reply
(2018-01-22)
Lee, Ya-Ju
;
Yang, Zu-Po
;
Chen, Pin-Guang
;
Hsieh, Yung-An
;
Yao, Yung-Chi
We present some comments to the paper "Monolithic integration of GaN-based light-emitting diodes and metal-oxide-semiconductor field-effect transistors: comment" [Opt. Express 22, A1589 (2014)]. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Revealing the Atomic Defects of WS2 Governing Its Distinct Optical Emissions
(2018-01-24)
Lin, Yung-Chang
;
Li, Shisheng
;
Komsa, Hannu-Pekka
;
Chang, Li-Jen
;
Krasheninnikov, Arkady V.
Defects and their spatial distribution are crucial factors in controlling the electronic and optical properties of semiconductors. By using scanning transmission electron microscopy and electron energy loss spectroscopy, the type of impurities/defects in WS2 subdomains with different optical properties is successfully assigned. A higher population of Cr impurities is found in the W-terminated edge domain, while the S-terminated domain contains more Fe impurities, in accordance with the luminescence characteristics of chemical-vapor-grown WS2 of a hexagonal shape. In agreement with the first-principles calculations, the domains with Cr substitutional dopants exhibit strong trion emission. Fe atoms tend to gather into trimer configuration and introduce deep acceptor levels which compensate the n-type doping and suppress trion emission. It is also discovered that the domain with higher luminescence but smaller defect concentration tends to get oxidized more rapidly and degrade the 2D structure with many triangular holes. Excitons tend to accumulate at the edges of the oxidized triangular holes and results in enhanced PL emission. The findings indicate that choosing stable elements as dopant and controlling the number of specific edge structures within a crystal domain of 2D transitional metal dichalcogenides can be a new route to improve the optical properties of these materials.
Heat performances of a thermosyphon as affected by evaporator wettability and filling ratio
(2018-01-25)
Xu, Zhi
;
Zhang, Yaning
;
Li, Bingxi
;
Wang, Chi-Chuan
;
Ma, Qin
A thermosyphon is considered an efficient heat dissipation device in engineering fields due to its low thermal resistance. The heat transfer mechanisms for thermosyphons at different evaporator wettability and filling ratios are not well detailed. A model considering evaporator wettability in terms of a contact angle is developed to detail the phase change process to explore the heat transfer mechanism for a thermosyphon in this study. The effects of evaporator wettability and filling ratio on the heat performances of a thermosyphon charged with water are investigated. It is observed that the simulated absolute temperatures with a contact angle are in better agreement with the experimental results with an average relative error of 0.15% than the simulation results without a contact angle (0.28%). The results show that a hydrophilic surface causes bubbles to easily depart the evaporator wall, thereby increasing the heat performance, whereas a hydrophobic surface causes bubbles to adhere to the evaporator wall, decreasing the heat performance. Further study shows that a low filling ratio of 12% will result in drying out, but a high filling ratio of 40% will prevent large bubbles from reaching the liquid surface, thereby decreasing the heat performance. The heat performance is best at filling ratios of 20-30% for an evaporator with a hydrophilic surface. (C) 2017 Elsevier Ltd. All rights reserved.
Anomalous Charge-Extraction Behavior for Graphene-Oxide (GO) and Reduced Graphene-Oxide (rGO) Films as Efficient p-Contact Layers for High-Performance Perovskite Solar Cells
(2018-01-25)
Jokar, Efat
;
Huang, Zhong Yi
;
Narra, Sudhakar
;
Wang, Chi-Yung
;
Kattoor, Vidya
Reduced graphene oxides (rGO) are synthesized via reduction of GO with reducing agents as a hole-extraction layer for high-performance inverted planar heterojunction perovskite solar cells. The best efficiencies of power conversion (PCE) of these rGO cells exceed 16%, much greater than those made of GO and poly(3,4-ethenedioxythiophene):poly(styrenesulfonate) films. A flexible rGO device shows PCE 13.8% and maintains 70% of its initial performance over 150 bending cycles. It is found that the hole-extraction period is much smaller for the GO/methylammonium lead-iodide perovskite (PSK) film than for the other rGO/PSK films, which contradicts their device performances. Photoluminescence and transient photoelectric decays are measured and control experiments are performed to prove that the reduction of the oxygen-containing groups in GO significantly decreases the ability of hole extraction from PSK to rGO and also retards the charge recombination at the rGO/PSK interface. When the hole injection from PSK to GO occurs rapidly, hole propagation from GO to the indium-doped tin oxide (ITO) substrate becomes a bottleneck to overcome, which leads to a rapid charge recombination that decreases the performance of the GO device relative to the rGO device.
Mechanism of a strange metal state near a heavy-fermion quantum critical point
(2018-01-26)
Chang, Yung-Yeh
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Paschen, Silke
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Chung, Chung-Hou
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電子物理學系
;
電機學院
Unconventional metallic or strange metal (SM) behavior with non-Fermi liquid (NFL) properties, generic features of heavy-fermion systems near quantum phase transitions, are yet to be understood microscopically. A paradigmatic example is the magnetic field-tuned quantum critical heavy-fermion metal YbRh2Si2, revealing a possible SM state over a finite range of fields at low temperatures when substituted with Ge. Above a critical field, the SM state gives way to a heavy Fermi liquid with Kondo correlation. The NFL behavior, most notably a linear-in-temperature electrical resistivity and a logarithmic-in-temperature followed by a power-law singularity in the specific heat coefficient at low temperatures, still lacks a definite understanding. We propose the following mechanism as origin of the experimentally observed behavior: a quasi-2d fluctuating short-ranged resonating-valence-bond spin liquid competing with the Kondo correlation. Applying a field-theoretical renormalization group analysis on an effective field theory beyond a large-N approach to an antiferromagnetic Kondo-Heisenberg model, we identify the critical point and explain remarkably well the SM behavior. Our theory goes beyond the well-established framework of quantum phase transitions and serves as a basis to address open issues in quantum critical heavy-fermion systems.
Methyl substitution enhanced photoisomerization of trans,trans-1,4-diphenyl-1,3-butadiene: direct ab initio trajectory surface hopping dynamic simulations
(2018-01-28)
Fan, Yueqian
;
Chen, Juan
;
Yu, Le
;
Li, Anyang
;
Zhai, Gaohong
Single methyl group substitution on the p-position of the phenyl ring (tt-DPB-me1) or the conjugated CQC bond (tt-DPB-me2) has been found to enhance the photoisomerization efficiency for two trans, trans-1,4-diphenyl-1,3-butadiene (tt-DPB) derivatives by performing direct ab initio trajectory surface hopping dynamics simulations. With implementation of the Zhu-Nakamura global switching algorithm, on-the-fly trajectory surface hopping dynamics simulations based on the ground state and first excited state potential energies and their gradients calculated by the two state averaged complete active space self-consistent field method with basis set 6-31G were propagated up to 3000 femtoseconds. Four-hundred sampling trajectories have been performed for both tt-DPB-me1 and tt-DPB-me2, and five distinctive photoisomerization pathways were observed for both of them. Among which, One Bond Flipping (OBF) and Hula-Twist (HT) are the dominant photoisomerization mechanisms. The lifetime of the S1 state is estimated to be 1423.0 fs (819.0 fs), and the photoisomerization quantum yields are 0.088 (0.378) in tt -> ct , 0.070 (0.015) in tt -> ct and 0.073 (0.065) in tt -> cc for tt-DPB-me1 (tt-DPB-me2). By analyzing the dynamics simulation data, it can be concluded that closer methyl substitution with respect to the central C=C double bond results in a higher percentage of the corresponding photoisomerization products. The present simulation results are in agreement with the ultrafast spectroscopy measurements, which unveil the photoisomerization mechanisms of tt-DPB derivatives and present useful physical insights on how to tune the photoisomerization of the substituted DPB.
【圖書館107年寒假開館調整及宅配服務】
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
配合政府節能減碳，圖書館於醫事國考2月4日（日）結束後，2月5日（一）至2月13日（二），週一至週五調整開館至17:00。
成長的起點：我們的第一個舞台
(國立陽明大學, 2018-01-31)
洪邦喻
;
李耿昇
;
林奕成
「文藝乃人醫之骨幹，創作則是我們原始的本能。」不知從何時開始，人醫人在同學眼中，總是和「戲劇」、「文青」等字眼連結著；而我們也確實孜孜不倦地在劇本與文章中投入生命，無所畏懼地往自己的靈魂深處探去。人醫（「陽明大學全國人文醫學研習營」簡稱）由三種成員組成，分別是第一年加入人醫的「小孩」、接下幹部職責的「老人」，與監督營隊運作的「顧問」。小孩在初入人醫時會被分到小家中，由老人帶領逐步了解何謂戲劇；而後才會分入劇組，準備營期演出的晚會劇。在小家中，我們將透過製作小家影片，讓小孩接觸劇本與集體創作；而寒假時舉辦的「寒體營」，則會讓小孩首次登上舞台，演出在人醫營的第一部作品──深度劇。
【教育部107年度學海系列獎學金】
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
嚮往出國交換研習、拓展視野嗎？教育部學海系列獎學金提供出國交換研習、實習補助，107年度獎學金申請日期將於2月22日截止，有意申請之老師與學生，請洽詢國際事務處、繳交應備文件，經國際事務處初審後推薦至教育部提出申請。
【107年動物中心使用說明會】
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
說明會將講述有關動物中心各區使用方式、動物訂購、代養、轉移和移房等申請。尚未參加使用說明會而目前已在本中心使用之同學，請務必參加此次說明會；另各科系所暫留室使用者亦請務必參加，想了解如何使用本中心者亦歡迎參加。
本校附醫十年有成院慶
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
本校附設醫院今年邁入第十年，1月18日在蘭陽院區舉行院慶，除了舉行醫療成果展，展現全院各醫護團隊十年來的努力成果，讓民眾更加了解陽大團隊的努力，也邀請在陽大重獲新生的重症病友一起慶祝改制十週年，共同見證每一個曾經努力的過程與成果，場面溫馨感人。創立於1895年的宜蘭大病院，已在宜蘭舊城區矗立百年，期間歷經省立宜蘭醫院、署立宜蘭醫院，直至2001年委託台北榮總經營、2008年改制為「國立陽明大學附設醫院」，再獲宜蘭人的信賴，因此陽大改制十週年可說為宜蘭醫療史創下了重要里程碑，院慶當天也為大家回顧這百年來的歷程。附醫羅世薰院長表示，陽大醫院除了延續百年大病院的醫療服務使命，同時肩負了大學附設醫院應有的教學、研究責任；儘管歷經世代變遷，但今日服務能量的提升與成長，已可見民眾對陽大的信賴、肯定與期盼；站在改制十週年的另一個新起跑點，下一個百年將是更大的責任與挑戰，陽大醫院願意承接挑戰，再創大病院的新價值。
六社聯合成發∼環遊世界100天
(國立陽明大學, 2018-01-31)
許珮甄
;
烘焙社
「環遊世界100天」是由六個社團──烘焙研究社、民族舞蹈社、揚鳴口琴社、調酒文化研究社、手語社及魔術社共同舉辦的聯合成果發表。六個社團各自展現社團特色，並帶來不同感官的衝擊，激盪出國情的差異或是聽聾之間文化的殊同；結合雙手、肢體與音符的舞動，呈現一場「視」、「聽」的絕佳饗宴；並藉由舞台表演和中場自助吧的方式，讓社員們回顧本學期所學的知識、舞蹈及技巧，展露各自於學期間努力的成果；對社員而言，是一次能力的自我見證。
106學年「我是公車達人」比賽結果
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
由校友總會與總務處事務組於上學期聯合舉辦的「我是公車達人」競賽，得獎名單已於1月11日揭曉，並公告在事務組網站上。此次共有591名同學得獎，除門檻90次以上的壹獎不足額以外，其它獎項皆滿額；活動三個月內期間最高搭乘次數達164次，顯見此項活動對於養成同學使用大眾運輸系統有正向引導作用。總務處事務組表示，這項比賽的目的是為鼓勵同學們多搭乘公共運輸工具、提升校園交通安全與綠能運輸，活動期間（106年10-12月）搭乘接駁車（含559公車及本校接駁車）的總運量為90583人次，較去年同期總運量80832人次增加了9751人次，也就是增加了12%，足見校內公共運輸的使用比例有不小提升。此外，活動期間搭乘559公車的總運量共74923人次，平均每月達24974人次；其中，持本校學生證悠遊卡的人數共1720人，活動期間搭乘超過20次以上人數（符合參賽資格）有753名，總搭乘次數達36048次，佔校內悠遊卡持卡者總運量的48.1%，成果亮眼。事務組表示，感謝校友總會對本次活動的贊助，頭獎至參獎以及參加獎得主可分別獲得價值3600元、900元、600元、300元、200元之全家禮物卡，得獎同學請在107年2月28日前，於上班時間（週一至週五8:30-17:00），持學生證至博雅中心二樓校友總會領取獎品。
國立陽明大學106年學年度第4次(擴大)行政會議紀錄
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
性平講座：在失戀中長大∼失戀與分手後處遇與心理重建
(國立陽明大學, 2018-01-31)
高翊宣
;
心諮中心
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秘書室
失戀是生命中的失落經驗，甚至可能造成心理創傷，失戀後伴隨而來的複雜情緒、行為以及生活上的改變，更是讓人覺得痛苦。本次講座的主講人李介文臨床心理師，是精神科診所兼任心理師，也是「失戀花園」與「哇賽心理學」網站的專欄作家，同時也是演唱歌手。講座過程中，他邊彈奏一首首目前膾炙人口的流行歌曲，像是〈小酒窩〉、〈暖心〉、〈你啊你啊〉、〈擊敗人〉、〈可惜不是你〉、〈你好不好〉、〈開始懂了〉等等，透過吉他輕快的旋律，帶大家體驗愛情從初戀到分手的酸甜苦辣與不同樣貌，一步步帶大家整理失戀過程中所帶來的混亂，細細品味在治療室裡所經歷的每一個故事；也分享失戀後想法的轉折，帶著大家從失戀中走出來，找到成長的力量。「你以為你最愛的是他，但其實讓你痛苦的，是失戀後，你不知道要怎麼再做回原來的自己……」「有時最傷人的，並非事實是怎樣，而是……事實跟我們想的不一樣。」是呀，在經歷失戀的痛苦後，我們都希望自己可以好起來，都希望自己不要再想起對方或依靠他……但有時我們再怎麼努力，似乎都擺脫不了對方的影子，不僅無法接受對方的決定與想法，也想不起在談戀愛前，自己原來的模樣…… 在面臨分手的情況時，很多時候說出口的理由都是言不由衷、不一定是真實的，甚至被分手者容易將對方曾說過的話都記下來，認為那就是導致分手的「真相」，但可能卻連對方真實的動機和原因都不清楚。事實上，對於失戀者來說，真實的「真相」，往往不一定是他們最在意的事情，但可以肯定的是：「被甩的人，是需要承接痛苦的那一方。」因此，隨之而來的痛苦感受就會不斷影響當事人，而使得他陷入恐懼和悲傷的迴圈裡。其實，不論讓你感受到痛苦的原因是什麼，都是很真實的感受，也是失戀中必定會經歷的過程。然而我們需要了解，這些痛苦帶給每個人的感受都不一樣，是非常私人的，但我們同樣都要嘗試在失戀的迴圈中，學習「面對」與「理解」自己的痛苦是怎麼回事，然後選擇一條適合自己走出失戀的道路。或許，你可以選擇把自己的感受寫成日記或回憶錄；或是暫時離開傷心地，展開一場復原的旅行；也可以找家人或朋友訴苦，出去唱歌或認識新的朋友。總之，做一件能讓你別具揮別意義的儀式，慢慢接受自己難過的事實；也在過程中，漸漸去體會和認識自己的悲傷與痛苦。畢竟這些感受也是自己的一部分，你需要「練習勇於面對」自己真實的情緒感受，與自己相處並找尋解答和意義；因為從這裡是最容易認識自己的，也更能使自己和生命相戀，然後照亮自己也幫助別人。曾經失戀過的人，都會明白其中的滋味與痛苦。自己也曾經在這條路上反覆徘徊過，但是從走出來的過程得到的體會，是更希望告訴大家：如果你希望能從失戀中變得更堅強，並且更認識自己與對方，請先學會理解和接受別人的「真實」，而不是躲回「自己認為的真實」。如果你現在剛失戀（分手至今一年內），可以參考下面14種急性失戀因應的方法，選擇一兩個自己覺得目前可以做到的方法去嘗試看看：不論是在什麼狀況下分手，都試著理解並接受自己會有各種複雜的情緒。照顧好自己，盡量睡好、吃好、做運動。避免酗酒、濫用毒品和亂性。不要去跟蹤或威脅前任情人。和可以提供正面能量的人在一起。別怕尋求專業心理師的幫助。覺得自己沒有靈魂是正常的，感覺「自我價值遺失」是療傷過程中很自然的一部分。重新認同自己，重新發現什麼讓你覺得快樂；在沒有前任的狀況下，找出什麼可以定義你自己的價值。失戀經驗其實是一個讓你重新審視自己、成長蛻變的機會。專注在失戀分手所帶來的好處，比如說重啟人生，你可以重新做自己喜歡做的事情。專注於正向積極的感覺，比如：放鬆、自由、樂觀（明天有無限可能）。試試練習寫作或練練談吐，幫助自己清楚表達內心深處的想法，對結束的關係也較能夠正面看待。要是身邊有「有緣人」可以馬上開始一段新的關係，不要害怕被人家講話、勇敢跨出去！不過一定要深思過，確定你接受這個新戀情的理由是有正當性、有道理的。如果前任已開始和其他人約會，請給他們空間，尊重他們的新戀情。記住：前任曾是你很關心過的一個人；也許仍然很關心，所以你應該像對任何其他朋友一樣，給予最好的祝福。儘管還有很多精神層面的感覺要克服，依然要正面看待自己對自己所付出的努力。給自己一些時間來療傷，不要急！
本期摘要
(國立陽明大學, 2018-01-31)
陽明電子報編輯小組
366期《陽明電子報》出刊了！