Browsing by Issue Date, starting with "2019-04-24"

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New Simultaneous Exfoliation and Doping Process for Generating MX2 Nanosheets for Electrocatalytic Hydrogen Evolution Reaction
(2019-04-24)
Van-Truong Nguyen
;
Yang, Tzu-Yi
;
Phuoc Anh Le
;
Yen, Po-Jen
;
Chueh, Yu-Lun
Doping nonmetal atoms into layered transition metal dichalcogenide MX2 structures has emerged as a promising strategy for enhancing their catalytic activities for the hydrogen evolution reaction. In this study, we developed a new and efficient one-step approach that involves simultaneous plasma-induced doping and exfoliating of MX2 bulk into nanosheets-such as MoSe2, WSe2, MoS2, and WS2 nano sheets-within a short time and at a low temperature (ca. 80 degrees C). Specifically, by utilizing active plasma that is generated with an asymmetric electrical field during the electrochemical reaction at the surface of the submerged cathode tip, we are able to achieve doping of nitrogen atoms, from the electrolytes, into the semiconducting 2H-MX2 structures during their exfoliation process from the bulk states, forming N-doped MX2. We selected N-doped MoS2 nanosheets for demonstrating their catalytic hydrogen evolution potential. We modulated the electronic and transport properties of the MoS2 structure with the synergy of nitrogen doping and exfoliating for enhancing their catalytic activity. We found that the nitrogen concentration of 5.2 atom % at N-doped MoS2 nanosheets have an excellent catalytic hydrogen evolution reaction, where a low overpotential of 164 mV at a current density of 10 mA cm(-2) and a small Tafel slope of 71 dec mV(-1)-much lower than those of exfoliated MoS2 nanosheets (207 mV, 82 dec mV(-1)) and bulk MoS2 (602 mV, 198 dec mV(-1))-as well as an extraordinary long-term stability of >25 h in 0.5 M H2SO4 can be achieved.
Biomechanical investigation of dynamic hip screw and wire fixation on an unstable intertrochanteric fracture
(2019-04-24)
Wu, Hsu-Fu
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Chang, Chih-Han
;
Wang, Gwo-Jaw
;
Lai, Kuo-An
;
Chen, Chung-Hwan
BackgroundAlthough use of a dynamic hip screw (DHS) for stable intertrochanteric hip fracture fixation has been successfully applied in fracture healing for more than 20years, DHS fixation on unstable intertrochanteric fractures still has a high failure rate, especially in patients with osteoporosis. Although the wire fixation is usually incorporated with orthopedic device to treat fracture, the wiring techniques are developed through experiences. Thus, this study is objective to investigate the biomechanical property of different wire fixation methods incorporated with DHS system to provide the lesser trochanter fragment stable fixation on osteoporotic TypeA2.1 fracture for enhancing stability after bone reduction.ResultsSawbone testing results demonstrated higher maximum load, stiffness, and energy in a DHS with wire fixation compared with DHS fixation only. In static biomechanical testing of a cadaver femur, we compared the stiffness of five fixation models and then tested a fatigue failure model in cycle loading with DHS fixation only. Wiring fixation can enhance stability and the cut-out failure model in the fatigue test was identical to the clinical failure model.ConclusionsLesser trochanteric fragment fixation is a crucial concern in the stability of an A2.1 unstable fracture, and the combination of a wiring technique with a DHS seems beneficial for achieving better stability. The addition of an antirotational greater trochanter is likely to enhance stability through wiring of the greater trochanter.
A rationally based model applicable for heat pump tumble dryer
(2019-04-26)
Lee, Bing-Hung
;
Sian, Rony A.
;
Wang, Chi-Chuan
;
機械工程學系
;
Department of Mechanical Engineering
The present study proposes a rationally based heat pump clothes dryer model which is capable of handling transient behaviors of both air-side and refrigerant side. The model can take into account the geometrical variation of the heat exchangers. Yet the proposed model is free from extra constraints that were normally imposed by previous studies. The simulation shows that there exist three stages in a typical drying process, including a preheat stage, followed by a constant evaporation stage, and finally a falling drying rate period. The calculation indicates that the variation of the clothes temperature and the system suction/discharge pressure show an appreciable rise in the first stage, remain nearly unchanged at the second stage, and increase again at the final stage of drying process. Also, the corresponding maximum specific moisture extraction rate (SMER) peaks at the end of the second stage while the corresponding coefficient of performance (COP) drops continuously. The simulation also indicates that increasing the air volumetric flowrate yields a lower discharge/suction pressure, a higher COP value, and a shorter drying time. The results also suggested that a good strategy to maximize COP is initiated by a low volumetric rate during the preheat stage, increasing it during the second stage and lowering it to an intermediate flowrate at the end of the drying period. Increasing heat exchanger size, either by increasing heat exchanger width or the number of tube row, results in a lower suction/discharge pressure and a shorter drying time. Although both approaches adopt larger surface area to promote overall performance, it is found that increasing the width of heat exchanger yields more effective results.
Dark channel prior based video dehazing algorithm with sky preservation and its embedded system realization for ADAS applications
(2019-04-29)
Tsai, Chia-Chi
;
Lin, Cheng-Yen
;
Guo, Jiun-In
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Dark Channel Prior (DCP) is one of the significant dehazing methods based upon the observation of the key features of the haze-free images. But it has disadvantages; high computational complexity, over-enhancement in the sky region, flickering artefacts in video processing, and poor dehazing. Therefore, we propose improved solutions to solve the aforementioned drawbacks. First, we adopt the fast one-dimensional filter, look-up table, and program optimization to reduce the computational complexity. Next, we follow by using a part of the guided filter for sky detection and to preserve the sky region from noise by avoiding over recovery. Then, we propose an airtight update strategy and adjust the radius of a guided filter to reduce the flickering artifacts and also propose an airtight estimation method to produce the better dehazing result as the final step of our algorithm. The improved results from our proposed algorithm are stable and are obtained from the real-time processing suitable for ADAS, surveillance, and monitoring systems. The implementation of the proposed algorithm has yielded a processing speed of 75 fps and 23 fps respectively on an NVIDIA Jetson TX1 embedded platform and Renesas R-Car M2. both on DI (720x480) resolution videos. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
【補充工作新動力】電影裡的生涯課～從微觀性向邁入巨觀職涯
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
打造最佳就業媒合平台，2019生醫就博會熱鬧登場
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
全國最大的生醫科技就業博覽會，4月27日在本校活動中心熱鬧登場！今年不僅盛況依舊，共有59家企業參展以及1200多位學生、企業人員...
陽明參與台日高齡學研合作，提升國際能見度
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
由陽明與國家衛生研究院、台北榮總，和日本國立長壽醫療研究中心合作多年的台日高齡學研合作，由於成果良好，台日雙方4月11日於名...
【反毒宣導月活動】毒你千遍也不厭倦～快樂健康，遠離毒害
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
關於夢的二三事
(國立陽明大學, 2019-04-30)
許伶楓
;
陽明電子報編輯小組
留學生齊聚陽明，史瓦帝尼首辦在台運動會
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
200多名來自史瓦帝尼（Eswatini）的留學生，4月13日齊聚在陽明的山頂操場舉辦運動會。這是台史建交50年來，史瓦帝尼大使館第一次...
【第二屆陽明人文社會講座】
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
陽明大學108年暑期營隊開跑囉！！
(國立陽明大學, 2019-04-30)
董芷伶
;
陽明電子報編輯小組
暑期即將來臨，本校各研習營係以推廣醫學（人文）教育及生物醫學教育等領域為目的，將於今年7月1日至8月2日分成四大營隊舉行，參與對象包括高中及大專院校學生，協助其對醫學相關課程有初步的認識，進而確立其生涯志向，歷年來活動成效深獲社會各界肯定。學員透過暑期營隊課程，可獲得不同領域之專業知識，並提前體驗大學生活，更藉此充實暑假。
【健康性教育性平月系列活動】戀愛學分修了沒？～好聚好散，好平安
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
【完美求職系列講座】醫療器材領域發展『大解析』
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
建構北投無邊界大學城，陽明開放社區借閱北市圖藏書
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
為深耕北投區的閱讀風氣，擴大社區民眾的閱讀資源，本校與臺北市立圖書館合作，民眾在陽明大學圖書館便可以直接借還北市圖825萬冊...
【Digital Medicine高峰論壇暨媒合會】
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
Mutual transferability for (F, B, R)-domination on strongly chordal graphs and cactus graphs
(2019-04-30)
Chu, Kuan-Ting
;
Lin, Wu-Hsiung
;
Chen, Chiuyuan
;
應用數學系
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Department of Applied Mathematics
This paper studies a variation of domination in graphs called (F, B, R)-domination. Let G = (V, E) be a graph and V be the disjoint union of F, B, and R, where F consists of free vertices, B consists of bound vertices, and R consists of required vertices. An (F, B, R)-dominating set of G is a subset D subset of V such that R subset of D and each vertex in B - D is adjacent to some vertex in D. An (F, B, R)-2-stable set of G is a subset S subset of B such that S boolean AND N(R) = empty set and every two distinct vertices x and y in S have distance d(x, y) > 2. We prove that if G is strongly chordal, then alpha(F,B,R,2) (G) = gamma(F,B,R)(G)-vertical bar R vertical bar, where gamma(F,B,R)(G) is the minimum cardinality of an (F, B, R)-dominating set of G and alpha(F,B,R,2) (G) is the maximum cardinality of an (F, B, R)-2-stable set of G. Let D-1 ->* D-2 denote D1 being transferable to D-2. We prove that if G is a connected strongly chordal graph in which D-1 and D-2 are two (F, B, R)-dominating sets with vertical bar D-1 vertical bar = vertical bar D-2 vertical bar, then D-1 ->* D-2. We also prove that if G is a cactus graph in which D-1 and D-2 are two (F, B, R) -dominating sets with vertical bar D-1 vertical bar = vertical bar D-2 vertical bar, then D-1 boolean OR {1.extra} ->* D-2 boolean OR{1.extra}, where boolean OR{1.extra} means adding one extra element. (C) 2019 Elsevier B.V. All rights reserved.
陳斯婷老師團隊發現「先天免疫檢查點」，補足諾貝爾醫學獎研究
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
「後天免疫檢查點」的發現開啟了癌症免疫療法，也獲得諾貝爾醫學獎。本校臨床醫學研究所陳斯婷助理教授團隊發現，人類的免疫細胞...
【導師增能專題講座】新世代的"性"與不"性"
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組
【5月份生技咖啡館】一個將基礎研究推向產業化的學習之旅
(國立陽明大學, 2019-04-30)
陽明電子報編輯小組