Browsing by Issue Date, starting with "2016-11-23"

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Laser-Scanned Programmable Color Temperature of Electroluminescence from White Light-Emitting Electrochemical Cells
(2016-11-23)
Lee, Hsiao-Chin
;
Chiang, Chien-Ming Fan
;
Wu, Po-Yi
;
Yao, Yung-Chi
;
Sarma, Monima
Recently, the control of correlated color temperature (CCT) of artificial solid-state white-light sources starts to attract more attention since CTs affect human physiology and health profoundly. In this work, we proposed and demonstrated a method that can widely tune the CCTs of electroluminescence (EL) from white-light-emitting electrochemical cells (LECs) by employing plasmonic filters. These integrated on-chip plasmonic filters are composed of semicontinuous thin Ag film or Ag nanoparticles (NPs) both included in the indium tin oxide anode contact, which have different characteristics of plasmonic resonant absorptions that can tune the EL spectra of white LECs. The CCTs of EL from white LECs integrated with semicontinuous thin Ag film and randomly distributed Ag NPs are 5778 and 2350 K, respectively. A commercially available laser scanning system was used to locally thermal anneal the semicontinuous thin Ag film to form the randomly distributed Ag NPs on the scanned areas. Hence, these two kinds of filters can be integrated on the same chip of white LEC, giving more freedom to control the CCTs of white EL and more potential applications. In addition, the laser scanning system used here is quite often used in display manufactures so that our proposed method can be immediately adopted by the light-emitting diode industry.
Nonlinear transport of the inhomogeneous Wigner solid in a channel geometry
(2016-11-23)
Badrutdinov, A. O.
;
Smorodin, A. V.
;
Rees, D. G.
;
Lin, J. Y.
;
Konstantinov, D.
The transport properties of an electronic Wigner solid (WS) on the surface of superfluid helium-4 are investigated in a geometry that allows WS systems of significantly different sizes to be defined. We probe and compare transport phenomena attributed to the electronic order, such as Bragg-Cherenkov scattering and the WS sliding transition, in the cases of a long homogeneous WS, a small WS island, and a long inhomogeneous WS. We find no significant WS size effects on the transport properties, in contrast to predictions of theoretical works, which indicates an absence of long-range order in the WS systems under consideration. For the inhomogeneous WS, consisting of two distinct WSs connected in series, a complex interplay of individual WS transport properties is observed, as revealed in the observation of two separate Bragg-Cherenkov plateaus and WS sliding transitions. A simple model is proposed that provides a qualitative explanation of this behavior.
Wafer Scale Phase-Engineered 1T-and 2H-MoSe2/Mo Core-Shell 3D-Hierarchical Nanostructures toward Efficient Electrocatalytic Hydrogen Evolution Reaction
(2016-11-23)
Qu, Yindong
;
Medina, Henry
;
Wang, Sheng-Wen
;
Wang, Yi-Chung
;
Chen, Chia-Wei
The necessity for new sources for greener and cleaner energy production to replace the existing ones has been increasingly growing in recent years. Of those new sources, the hydrogen evolution reaction has a large potential. In this work, for the first time, MoSe2/Mo core-shell 3D-hierarchical nanostructures are created, which are derived from the Mo 3D-hierarchical nanostructures through a low-temperature plasma-assisted selenization process with controlled shapes grown by a glancing angle deposition system.
High-temperature ratchets with sawtooth potentials
(2016-11-23)
Rozenbaum, Viktor M.
;
Shapochkina, Irina V.
;
Sheu, Sheh-Yi
;
Yang, Dah-Yen
;
Lin, Sheng Hsien
The concept of the effective potential is suggested as an efficient instrument to get a uniform analytical description of stochastic high-temperature on-off flashing and rocking ratchets. The analytical representation for the average particle velocity, obtained within this technique, allows description of ratchets with sharp potentials (and potentials with jumps in particular). For sawtooth potentials, the explicit analytical expressions for the average velocity of on-off flashing and rocking ratchets valid for arbitrary frequencies of potential energy fluctuations are derived; the difference in their high-frequency asymptotics is explored for the smooth and cusped profiles, and profiles with jumps. The origin of the difference as well as the appearance of the jump behavior in ratchet characteristics are interpreted in terms of self-similar universal solutions which give the continuous description of the effect. It is shown how the jump behavior in motor characteristics arises from the competition between the characteristic times of the system.
Stark Spectroscopy of Absorption and Emission of Indoline Sensitizers: A Correlation with the Performance of Photovoltaic Cells
(2016-11-24)
Ohta, Nobuhiro
;
Awasthi, Kamlesh
;
Okoshi, Kenji
;
Manseki, Kazuhiro
;
Miura, Hidetoshi
Electric field effects on photoexcitation dynamics and electronic properties of highly efficient indoline sensitizers, DN488, D205, and DN182, embedded in PMMA films have been examined by using electroabsorption (E-A) and electrophotoluminescence (E-PL) spectroscopic techniques and time-resolved photoluminescence (PL) decay measurements in the presence of electric fields. Photovoltaic performances have been also measured for devices constructed using these sensitizers. Then, field-induced quenching of PL and field-induced change in PL decay profile were observed, and it was found that these field effects, which depend on the sensitizers investigated herein, are well correlated with the trend of power conversion efficiencies of the corresponding photovoltaic cells. Electric dipole moment and molecular polarizability of these sensitizers both in the ground state (S-0) and in the excited state have been calculated at the level of B3LYP/6-31G(d), and the differencesof these physical parameters between So and excited state thus obtained have been compared with the ones determined from the E-A and E-PL spectra. The present study of Stark spectroscopy of indoline dyes provides new insights for the exciton dissociation property and carrier mobility of organic dyes, which are important factors to understand the operation mechanism in dye-sensitized solar cells.
Solution-Processed Hybrid Light-Emitting Devices Comprising TiO2 Nanorods and WO3 Layers as Carrier-Transporting Layers
(2016-11-24)
Tsai, Tsung-Yan
;
Yan, Po-Ruei
;
Yang, Sheng-Hsiung
;
照明與能源光電研究所
;
Institute of Lighting and Energy Photonics
The goal of this research is to prepare inverted light-emitting devices with improved performance by combining titanium dioxide (TiO2) nanorods and tungsten trioxide (WO3) layer. TiO2 nanorods with different lengths were established directly on the fluorine-doped tin oxide (FTO) substrates by the hydrothermal method. The prepared TiO2 nanorods with lengths shorter than 200 nm possess transmittance higher than 80% in the visible range. Inverted light-emitting devices with the configuration of FTO/TiO2 nanorods/ionic PF/MEH-PPV/PEDOT:PSS/WO3/Au were constructed. The best device based on 100-nm-height TiO2 nanorods achieved a max brightness of 4493 cd/m(2) and current efficiency of 0.66 cd/A, revealing much higher performance compared with those using TiO2 compact layer or nanorods with longer lengths as electron-transporting layers.
CDNPatch: a cost-effective failover mechanism for hybrid CDN-P2P live streaming systems
(2016-11-25)
Wang, Chih-Chiang
;
Lin, Ying-Dar
;
資訊工程學系
;
Department of Computer Science
Among the most well-established live media distribution technologies is content delivery network (CDN), which improves user-perceived quality of service by delivering content from proxy servers deployed at the Internet\'s edge. In recent years, CDN providers started to tap into their subscribers\' peer-to-peer (P2P) capacity to alleviate their server costs. Under the inherent peer dynamics, a major challenge of these hybrid CDN-P2P systems is to provide efficient failure recovery with good quality of service guarantees at a reduced server cost. In this work we propose a cost-effective failover solution named CDNPatch to address the aforementioned problem. CDNPatch enables peers to periodically precompute a few backup content suppliers by efficient information exchange and maintenance algorithms, and leverages auxiliary CDN servers and an economic server provisioning algorithm to reduce the chance of playback interruption occurring to peers. Our simulation results show that CDNPatch can mask the impact of peer dynamics of 3 real P2P systems, namely, SOPCast, PPStream, and PPTV, with 100% failure recovery success rate and a failure recovery time less than 1 second at a cost of small P2P communication overhead of less than 1 kilobits per second, while using only 10%, 21%, and 51%, respectively, of the pure CDN scheme\'s server consumption.
Strain and optical characteristics study of ferromagnetic GaMnAs fabricated by ion beam induced epitaxial crystallization
(2016-11-25)
Chen, Nai-Hui
;
Chen, Chien-Hsu
;
Lee, Chien-Ping
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this study, we use a semi-insulating GaAs wafer to prepare a GaMnAs thin film by Mn ion implantation and subsequent helium ion beam induced epitaxial crystallization. In addition, we use different helium energies to anneal the GaMnAs thin films. The regrown GaMnAs thin films are measured using high-resolution X-Ray diffraction, Raman scattering and spectrophotometry to analyze the crystal structures and optical properties. It is found that the GaMnAs thin films remain fully strained. All experimental results indicate that the GaMnAs thin film is formed after the ion beam induced epitaxial crystallization annealing. (C) 2016 Elsevier B.V. All rights reserved.
Strain and optical characteristics study of ferromagnetic GaMnAs fabricated by ion beam induced epitaxial crystallization
(2016-11-25)
Chen, Nai-Hui
;
Chen, Chien-Hsu
;
Lee, Chien-Ping
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this study, we use a semi-insulating GaAs wafer to prepare a GaMnAs thin film by Mn ion implantation and subsequent helium ion beam induced epitaxial crystallization. In addition, we use different helium energies to anneal the GaMnAs thin films. The regrown GaMnAs thin films are measured using high-resolution X-Ray diffraction, Raman scattering and spectrophotometry to analyze the crystal structures and optical properties. It is found that the GaMnAs thin films remain fully strained. All experimental results indicate that the GaMnAs thin film is formed after the ion beam induced epitaxial crystallization annealing. (C) 2016 Elsevier B.V. All rights reserved.
新社花海　綻放台中
(2016-11-27)
張芳語
;
Department of Communication and Technology
;
傳播與科技學系
一年一度的台中新社花海在11月隆重開幕，免費入場和各式活動吸引上萬民眾參與。
城市軌跡
(2016-11-27)
卓業軒
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Department of Communication and Technology
;
傳播與科技學系
以十二張黑白照片記錄勤美商圈的都市角落與象徵性的城市故事。
看見空氣　LASS環境感測
(2016-11-27)
陳昱彣
;
Department of Communication and Technology
;
傳播與科技學系
介紹LASS環境網路感測系統以及創辦者哈爸。
插畫家Yuci　畫出夢想藍圖
(2016-11-27)
劉以寧
;
Department of Communication and Technology
;
傳播與科技學系
八年級網路插畫家Yuci，跳脫舒適圈，為了自己的創業夢想而努力。
美食外送　法制與商機的拔河
(2016-11-27)
曾婕茵
;
Department of Communication and Technology
;
傳播與科技學系
Uber於11月15日正式推出UberEATS餐飲外送服務，違法經營的問題讓其他提供類似服務的業者也連帶備受關注。
萬萬小宇宙　中韓音樂的碰撞
(2016-11-27)
王羽廷
;
Department of Communication and Technology
;
傳播與科技學系
由兩個中國人及一名韓國人所組成的團體，是怎麼在網路上一炮而紅？
獨　舞
(2016-11-27)
陳昶安
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Department of Communication and Technology
;
傳播與科技學系
轉啊轉啊轉，踩著孤獨的舞步，換一個留不住的理由。
性成癮　性與愛的對話
(2016-11-27)
吳偉立
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Department of Communication and Technology
;
傳播與科技學系
評論性愛成癮的女人，揣測導演拋出的訊息。
電業自由化　打開電力市場
(2016-11-27)
張博倫
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Department of Communication and Technology
;
傳播與科技學系
電業法是今年影響民生最大的法案，但媒體曝光率不足，而且非常艱深。藉由此篇報導，說明電業法的爭議所在。
總編輯的話
(2016-11-27)
李瑞彥
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Department of Communication and Technology
;
傳播與科技學系
本期為第253期，為讀者呈上跨領域深度豐富的文章。頭題為「電業自由化　打開電力市場」，針對電業現況長時間取材、深度敘寫，值得一讀。本期各類目皆有亮眼表現，共通點為深入淺出，富有知識性，不容錯過。
不折志　風骨市長蔡仁堅
(2016-11-27)
范瑀真
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Department of Communication and Technology
;
傳播與科技學系
前新竹市長蔡仁堅於任內完成多項大型建設，近年積極投入地方導覽、文史講座，並準備2018再度競選市長。