Browsing by Issue Date, starting with "2017-11-07"

Now showing 1 - 20 of 12798

Role of indium tin oxide electrode on the microstructure of self-assembled WO3-BiVO4 hetero nanostructures
(2017-11-07)
Song, Haili
;
Li, Chao
;
Chien Nguyen Van
;
Dong, Wenxia
;
Qi, Ruijuan
Self-assembled WO3-BiVO4 nanostructured thin films were grown on a (001) yttrium stabilized zirconia (YSZ) substrate by the pulsed laser deposition method with and without the indium tin oxide (ITO) bottom electrode. Their microstructures including surface morphologies, crystalline phases, epitaxial relationships, interface structures, and composition distributions were investigated by scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray energy dispersive spectroscopy. In both samples, WO3 formed nanopillars embedded into the monoclinic BiVO4 matrix with specific orientation relationships. In the sample with the ITO bottom electrode, an atomically sharp BiVO4/ITO interface was formed and the orthorhombic WO3 nanopillars were grown on a relaxed BiVO4 buffer layer with a mixed orthorhombic and hexagonal WO3 transition layer. In contrast, a thin amorphous layer appears at the interfaces between the thin film and the YSZ substrate in the sample without the ITO electrode. In addition, orthorhombic Bi2WO6 lamellar nanopillars were formed between WO3 and BiVO4 due to interdiffusion. Such a WO3-Bi2WO6-BiVO4 double heterojunction photoanode may promote the photo-generated charge separation and further improve the photoelectrochemical water splitting properties. Published by AIP Publishing.
Interfacial Engineering with Cross-Linkable Fullerene Derivatives for High-Performance Perovskite Solar Cells
(2017-11-08)
Kang, Tin
;
Tsai, Cheng-Min
;
Jiang, Yu-He
;
Gollavelli, Ganesh
;
Mohanta, Nayantara
Two fullerene derivatives with styryl and oxetane cross-linking groups served as interfacial materials to modify an electron-transporting layer (ETL) of TiO2, doped with Au nanoparticles, processed under low-temperature conditions to improve the performance of perovskite solar cells (PSC). The cross-linkable [6,6]-phenyl-C-61-butyric styryl dendron ester was produced via thermal treatment at 160 degrees C for 20 min, whereas the cross-linkable [6,6]-phenyl-C-61-butyric oxetane dendron ester (C-PCBOD) was obtained via UV-curing treatment for 45 s. Both cross-linked fullerenes can passivate surface-trap states of TiO2 and have also excellent surface coverage on the TiO2 layer shown in the corresponding atomic force microscopy images. To improve the crystallinity of perovskite, we propose a simple co-solvent method involving mixing dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) in a specific ratio (DMF/DMSO = 90/10). The fullerene derivative layer between the ETL and perovskite layers significantly improved electron extraction and suppressed charge recombination by decreasing the density of traps at the ETL surface. A planar PSC device was fabricated with the configuration indium tin oxide/TiO2 (Au)/C-PCBOD/perovskite/spiro-OMeTAD/Au to attain a power conversion efficiency (PCE) of 15.9%. The device performance was optimized with C-PCBOD as an interfacial mediate to modify the surface of the mesoporous TiO2 ETL; the C-PCBOD-treated device attained a significantly enhanced performance, PCE 18.3%. Electrochemical impedance spectral and photoluminescence decay measurements were carried out to understand the characteristics of electron transfer and charge recombination of the perovskite/TiO2 samples with and without a fullerene interfacial layer.
PREFERABLY ORIENTED NANOTWINNED AU FILM, METHOD OF PREPARING THE SAME, AND BONDING STRUCTURE COMPRISING THE SAME
(2017-11-09)
Chih CHEN
;
Wei-Lan CHIU
;
Yi-Chia CHOU
The present invention is related to a preferably oriented nanotwinned Au film, a method of preparing the same, and a bonding structure comprising the same. The nanotwinned Au film has a thickness direction. The nanotwinned Au film is stacked along a [220] crystallographic axis orientation in the thickness direction. At least 50% by volume of the nanotwinned Au film is composed of a plurality of nanotwinned Au grains which are adjacent to each other, arranged in a direction perpendicular to the thickness direction, and stacked along a crystallographic axis orientation.
A community detection algorithm using network topologies and rule-based hierarchical arc-merging strategies
(2017-11-09)
Fu, Yu-Hsiang
;
Huang, Chung-Yuan
;
Sun, Chuen-Tsai
;
資訊工程學系
;
Department of Computer Science
The authors use four criteria to examine a novel community detection algorithm: (a) effectiveness in terms of producing high values of normalized mutual information (NMI) and modularity, using well-known social networks for testing; (b) examination, meaning the ability to examine mitigating resolution limit problems using NMI values and synthetic networks; (c) correctness, meaning the ability to identify useful community structure results in terms of NMI values and Lancichinetti-Fortunato-Radicchi (LFR) benchmark networks; and (d) scalability, or the ability to produce comparable modularity values with fast execution times when working with large-scale real-world networks. In addition to describing a simple hierarchical arc-merging (HAM) algorithm that uses network topology information, we introduce rule-based arc-merging strategies for identifying community structures. Five well-studied social network datasets and eight sets of LFR benchmark networks were employed to validate the correctness of a ground-truth community, eight large-scale real-world complex networks were used to measure its efficiency, and two synthetic networks were used to determine its susceptibility to two resolution limit problems. Our experimental results indicate that the proposed HAM algorithm exhibited satisfactory performance efficiency, and that HAM-identified and ground-truth communities were comparable in terms of social and LFR benchmark networks, while mitigating resolution limit problems.
The 17 MeV anomaly in beryllium decays and U(1) portal to dark matter
(2017-11-10)
Chen, Chian-Shu
;
Lin, Guey-Lin
;
Lin, Yen-Hsun
;
Xu, Fanrong
;
物理研究所
The experiment of Krasznahorkay et al. observed the transition of a Be-8 excited state to its ground state and accompanied by an emission of an e(+) e(-) pair with 17 MeV invariant mass. This 6.8 sigma anomaly can be fitted by a new light gauge boson. We consider the new particle as a U(1) gauge boson, Z', which plays as a portal linking dark sector and visible sector. In particular, we study the new U(1) gauge symmetry as a hidden or nonhidden group separately. The generic hidden U(1) model, referred to as dark Z model, is excluded by imposing various experimental constraints. On the other hand, a nonhidden Z' is allowed due to the additional interactions between Z' and Standard Model fermions. We also study the implication of the dark matter direct search on such a scenario. We found that the search for the DM-nucleon scattering cannot probe the parameter space that is allowed by Be-8-anomaly for the range of DM mass above 500 MeV. However, the DM-electron scattering for DM between 20 MeV and 50 MeV can test the underlying U(1) portal model using the future Si and Ge detectors with the 5e(-) threshold charges.
覓
(2017-11-12)
王毓楷
;
Department of Communication and Technology
;
傳播與科技學系
「意識是一種特殊的心理行為，它是感官將其他來源的材料經過一番加工而形成的產品。」——佛洛伊德
總編輯的話
(2017-11-12)
林育平
;
Department of Communication and Technology
;
傳播與科技學系
本期為喀報274期，稿件數量仍以自由創作居多，利用不同媒材給予讀者新感受；同時人物特寫則橫跨多領域，帶領讀者認識各行各業之翹楚。
原住民的力與美　娜魯灣文化節
(2017-11-12)
蔡璨竹
;
簡嘉瑩
;
Department of Communication and Technology
;
傳播與科技學系
娜魯灣文化節暨原住民族運動會，今年以布農族進倉祭為主軸，11月4日在台北市天母運動公園熱鬧展開，吸引原住民朋友一同來共襄盛舉。
對抗溫室效應　二氧化碳變石頭
(2017-11-12)
游允彤
;
Department of Communication and Technology
;
傳播與科技學系
在冰島進行的二氧化碳礦物化實驗，顛覆以往認為二氧化碳礦化需上百年的觀念，在兩年內成功將95%的二氧化碳變成石頭。
擺脫舊時代　客家義民嘉年華
(2017-11-12)
戴淨妍
;
黃郁庭
;
Department of Communication and Technology
;
傳播與科技學系
台北客家義民嘉年華在台北已有30年歷史，今年透過豐富表演期望帶給民眾全新的客家感受。
最後的擁抱
(2017-11-12)
劉翊安
;
Department of Communication and Technology
;
傳播與科技學系
與已逝去的阿婆，最後的互動。
拉伸自如　混合3D列印技術
(2017-11-12)
吳佩芸
;
Department of Communication and Technology
;
傳播與科技學系
今年9月，美國哈佛大學與美國空軍研究實驗室迎來穿戴式裝置的革命性突破。
啊～好怪好可愛～
(2017-11-12)
簡文怡
;
Department of Communication and Technology
;
傳播與科技學系
「怪」與「可愛」不是反義詞嗎，為什麼我們會覺得東西怪得很可愛呢？
動物溝通　一場非凡的對話
(2017-11-12)
顏維萱
;
Department of Communication and Technology
;
傳播與科技學系
專訪動物溝通師Lance Hao，透過溝通師現身說法，探究動物溝通的奧妙。
吞噬心靈的怪獸
(2017-11-12)
林明慧
;
Department of Communication and Technology
;
傳播與科技學系
強迫症宛如怪獸，掌控著患者的思想與行為。放棄生命的念頭時常湧上心頭，平凡地活下去是他們最大的夢想，敬那些仍在奮戰的生命鬥士。
膝關節　如果人生是部電影
(2017-11-12)
甘愷璇
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Department of Communication and Technology
;
傳播與科技學系
專訪台灣知名影評人膝關節，一窺他如何與電影展開一場奇妙旅程。
加油　為你唱首歌
(2017-11-12)
王沛軒
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Department of Communication and Technology
;
傳播與科技學系
寫文章不行，只好寫歌了。用淺白的歌詞和簡單的和弦告訴你：沒關係，你已經很棒了！
黑白？
(2017-11-12)
朱珈漪
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Department of Communication and Technology
;
傳播與科技學系
你能說出人前人後哪個才是真的你嗎？
不用就尷尬？表情符號依賴時代
(2017-11-12)
蕭巧昱
;
Department of Communication and Technology
;
傳播與科技學系
線上溝通已是現代人相互交流的主流方式，人們對表情符號的高度使用似乎也隨之成為一種風潮，發展出不容忽視的特殊文化與影響力。
麻醉的心　如何穿越風暴
(2017-11-12)
陳品文
;
Department of Communication and Technology
;
傳播與科技學系
繼《麻醉風暴》後，台灣醫療劇再度崛起，本篇帶您一同進入續集的風暴，看見社會的黑暗面。