Browsing by Issue Date, starting with "2011-12-15"

Now showing 1 - 20 of 39519

Subdiffraction scattered light imaging of gold nanoparticles using structured illumination
(2011-12-15)
Chang, Bo-Jui
;
Lin, Shiuan Huei
;
Chou, Li-Jun
;
Chiang, Su-Yu
;
電子物理學系
A reflective light-scattering (RLS) microscope with structured illumination (SI) provides subdiffraction resolution and improves the image quality of gold nanoparticles in biological systems. The three-dimensional (3D)-structured pattern is rapidly and precisely controlled with a spatial light modulator and scrambled at the conjugate image plane to increase spatial incoherence. The reconstructed SI-RLS image of 100nm gold nanoparticles reveals lateral and axial resolutions of approximately 117 and 428nm. We present a high-resolution image of gold nanoparticles inside a HeLa cell, with improved contrast. (C) 2011 Optical Society of America
Synthesis of poly(4-vinylphenol) (PVPh) and polyhedral oligomeric silsesquioxanes-poly(4-vinylphenol) (POSS-PVPh) with low surface energy and their surface properties
(2011-12-15)
Liao, Chun-Hsiung
;
Chien, Fu-Ming
;
Chen, Chen-Ming
;
Liu, Lung-Chang
;
Chung, Ming-Hua
In this paper, we have synthesized poly(4-vinylphenol) (PVPh) and polyhedral oligomeric silsesquioxanes-poly(4-vinylphenol) (POSS-PVPh) with low surface energies and investigated their surface properties. Experimental results reveal that the surface properties of PVPh and POSS-PVPh can be manipulated with the length of PVPh segment and POSS contents, respectively, resulting in the variation of intermolecular hydrogen bonding interactions. In addition, the surface energies of PVPh after thermal treatment of 180 degrees C for 24 h can be less than 20 mJ m(-2) and those of POSS-PVPh without thermal treatment can be less than 25 mJ m-2 while those of poly(tetrafluoroethylene)(PTFE) are 22 mJ m(-2). (C) 2011 Elsevier B.V. All rights reserved.
Mechanism and characterizations studies of resistive switching effects on a thin FeO(x)-transition layer of the Ti/TiN/SiO(2)/FeO(x)/FePt structure by thermal annealing treatments
(2011-12-15)
Chang, Yao-Feng
;
Feng, Li-Wei
;
Chang, Ting-Chang
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
We investigated annealing effects on the bipolar resistive switching characteristics and mechanism of the thin FeO(x) transition layer in a Ti/TiN/SiO(2)/FeO(x)/FePt structure by depositing a plasma-enhanced tetraethyl orthosilicate oxide onto the Fe-contented electrode. The electrical results show that the values of operation voltage, variation of electrical parameters and retention properties could be improved with the increasing thermal treatment budget. Tunneling electron microscope, X-ray diffraction, Auger electron spectroscopy and X-ray photon-emission spectra depth profiles were examined for cross-section image, crystallinity and composition analyses of the transition layer. In order to investigate the resistive switching mechanism and characterizations in Ti/TiN/SiO(2)/FeO(x)/FePt structure, the electrical parameters were extracted during set and reset process. The retention property at room temperature and 85 C was improved after the thermal treatment and maintains both resistance states over 6 x 10(4) s implies promising potential for future memory application. (C) 2011 Elsevier B.V. All rights reserved.
Enhanced Output Power of GaN-Based Resonance Cavity Light-Emitting Diodes With Optimized ITO Design
(2011-12-15)
Wu, Tzeng-Tsong
;
Lin, Chien-Chung
;
Wu, Yun-Lin
;
Chen, Chien-Kang
;
Lu, Tien-Chang
We fabricated and measured GaN-based resonant cavity light-emitting diodes with a 30 nm thick Indium tin oxide (ITO) thin film as a transparent contact layer. Four different ITO structures on p-type GaN samples were deposited by sputter and e-gun, and the corresponding device performance was compared. Each of these four samples has been annealed by its optimal parameters. The ITO thin film deposited by sputter demonstrated better electrical characteristics, surface morphology, specific contact resistance, and the overall device light output compared to those of the e-gun samples. Between the two sputtered ITO types, the hybrid type shows higher roll-over current density of 14 kA/cm(2), and the output power is increased from 15 to 39 mu W. From statistical data of the 2-D light intensity under the same current, we saw the lateral current spreading of the pure crystalline ITO by sputter is worst. The hybrid type, which combines the crystalline and amorphous ITO, has the best overall performance when we consider all the electrical, optical, and metrology measurements. From these results, we believe the 30 nm thick hybrid ITO thin film has the best potential to be applied in light emitting devices such as light-emitting diodes, laser diodes, etc.
Two dimensional shallow-water flow model with immersed boundary method
(2011-12-15)
Chung, Hau-Rong
;
Hsieh, Te-Yung
;
Yang, Jinn-Chuang
;
防災與水環境研究中心
;
Disaster Prevention and Water Environment Research Center
This study demonstrates an immersed boundary (IB) method which integrates a depth-averaged two dimensional flow model is proposed to tackle a typical fluid-solid phase problem in fluid dynamics field. The finite-difference scheme with curvilinear coordinate system is employed to discretize the shallow-water flow equations. Lagrangian markers and Eulerian grid are applied to portray the geometric contour of interior boundary and discretize the flow domain, respectively. The Dirac delta function is accordingly conducted to link both Lagrangian and Eulerian coordinate systems. The numerical simulations of single pier are performed and compared to examine the effect of marker's mesh width, grid size, and the various Dirac delta functions. Experimental data from literatures are compared with numerical results to justify the validity of the proposed IB model. To further demonstrate the model capability, the model is applied to the hypothetical cases of piers in parallel, and compared with theoretical results. (C) 2011 Elsevier Ltd. All rights reserved.
Study of 375 nm ultraviolet InGaN/AlGaN light-emitting diodes with heavily Si-doped GaN transition layer in growth mode, internal quantum efficiency, and device performance
(2011-12-15)
Huang, Shih-Cheng
;
Shen, Kun-Ching
;
Wuu, Dong-Sing
;
Tu, Po-Min
;
Kuo, Hao-Chung
High performance 375 nm ultraviolet (UV) InGaN/AlGaN light-emitting diodes (LEDs) were demonstrated with inserting a heavy Si-doped GaN transition layer by metal-organic chemical vapor deposition. From transmission electron microcopy (TEM) image, the dislocation densities were significantly reduced due to the existence of the heavily Si-doping growth mode transition layer (GMTL), which results in residual stress relaxation and 3D growth. The internal quantum efficiency (IQE) of the LEDs with GMTL was measured by power-dependent photoluminescence (PL) to be 40.6% higher than ones without GMTL. The GMTL leads to the superior IQE performance of LEDs not only in decreasing carrier consumption at nonradiative recombination centers but also in partially mitigating the efficiency droop tendency. When the vertical-type LED chips (size: 1 mm x 1 mm) was driven with a 350 mA injection current, the output powers of the LEDs with and without GMTL were measured to be 286.7 and 204.2 mW, respectively. A 40.4% enhancement of light output power was achieved. Therefore, using the GMTL to reduce dislocations would be a promising prospective for InGaN/AlGaN UV-LEDs to achieve high IQE. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3669377]
METHOD AND SYSTEM FOR TRANSMITTING AND RECEIVING VEHICLE INFORMATION
(2011-12-15)
WU BING-FEI
;
LI YEN-FENG
;
KAO CHIH-CHUNG
;
CHEN YING-HAN
;
CHEN CHAO-JUNG
The present invention provides a method and system for transmitting and receiving vehicle information, in which a wireless transmitting and receiving unit and a vehicle computer recording a first information is disposed in the vehicle, and a processing computer is disposed in a vehicle station. When the vehicle enters the vehicle station, the vehicle wirelessly transmits the first information to the processing computer according to a request signal. After that, the processing computer wirelessly transmits a second information to the vehicle computer at a specific time point. By means of the method and system of the present invention, it is capable of exchanging information between the vehicle and vehicle station in a wireless transmitting and receiving way so as to save the waiting time for maintenance and management.
Conducting polymer-based counter electrode for a quantum-dot-sensitized solar cell (QDSSC) with a polysulfide electrolyte
(2011-12-15)
Yeh, Min-Hsin
;
Lee, Chuan-Pei
;
Chou, Chen-Yu
;
Lin, Lu-Yin
;
Wei, Hung-Yu
Conducting polymer materials, i.e., polythiophene (PT), polypyrrole (PPy), and poly(3,4-ethylenedioxythiophene) (PEDOT) were used to prepare counter electrodes (CEs) for quantum-dot-sensitized solar cells (QDSSCs). The QDSSC with PEDOT-CE exhibited the highest solar-to-electricity conversion efficiency (eta) of 1.35%, which is remarkably higher than those of the cells with PT-CE (0.09%) and PPy-CE (0.41%) and very slightly higher than that of the cell with sputtered-gold-CE (1.33%). Electrochemical impedance spectra (EIS) show that this highest conversion efficiency of the PEDOT-based cell is due to higher electrocatalytic activity and reduced charge transfer resistance at the interface of the CE and the electrolyte, compared to those in the case of the cells with other conducting polymers and bare Au. Furthermore, the influences of morphology of the PEDOT film and the charge passed for its electropolymerization on the performance of its QDSSC were also studied. The higher porosity and surface roughness of the PEDOT matrix, with reference to those of other polymers are understood to be the reason for PEDOT to possess higher electrocatalytic activity at its interface with electrolyte. (C) 2011 Elsevier Ltd. All rights reserved.
DNA double-strand breaks induced along the trajectory of particles
(2011-12-15)
Cho, I. C.
;
Niu, H.
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Chen, C. H.
;
Yu, Y. C.
;
Hsu, C. H.
It is well-known that the DNA damage caused by charged particles considerably differs from damage due to electromagnetic radiation. In the case of irradiation by charged particles the DNA lesions are more complex and clustered. Such clustered damage is presumed difficult to be repaired, and is potentially lethal. In this study, we utilize a 90 degrees-scattering system and related imaging techniques to investigate the accumulation of gamma-H2AX along the trajectory of charged particles. By immunostaining the gamma-H2AX protein, optical images of corresponding double strand breaks were observed using a high resolution confocal microscope. We demonstrate the difference in the accumulation of gamma-H2AX from irradiation by 1 MeV protons and that of 150 key X-rays. The acquired images were arranged and reconstructed into a 3D image using ImageJ software. We discovered that the gamma-H2AX foci, following irradiation by protons, have a tendency to extend in the beam direction, while those from X-ray irradiation tend to be smaller and more randomly distributed. These results can be explained by the physical model of energy deposition. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
Mechanism and characterizations studies of resistive switching effects on a thin FeOx-transition layer of the Ti/TiN/SiO2/FeOx/FePt structure by thermal annealing treatments
(2011-12-15)
Chang, Yao-Feng
;
Feng, Li-Wei
;
Chang, Ting-Chang
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
We investigated annealing effects on the bipolar resistive switching characteristics and mechanism of the thin FeOx transition layer in a Ti/TiN/SiO2/FeOx/FePt structure by depositing a plasma-enhanced tetraethyl orthosilicate oxide onto the Fe-contented electrode. The electrical results show that the values of operation voltage, variation of electrical parameters and retention properties could be improved with the increasing thermal treatment budget. Tunneling electron microscope, X-ray diffraction, Auger electron spectroscopy and X-ray photon-emission spectra depth profiles were examined for cross-section image, crystallinity and composition analyses of the transition layer. In order to investigate the resistive switching mechanism and characterizations in Ti/TiN/SiO2/FeOx/FePt structure, the electrical parameters were extracted during set and reset process. The retention property at room temperature and 85 C was improved after the thermal treatment and maintains both resistance states over 6 x 10(4) s implies promising potential for future memory application. (C) 2011 Elsevier B.V. All rights reserved.
Water-soluble germanium nanoparticles cause necrotic cell death and the damage can be attenuated by blocking the transduction of necrotic signaling pathway
(2011-12-15)
Ma, Yu-Hsin
;
Huang, Chin-Ping
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Tsai, Jia-Shiuan
;
Shen, Mo-Yuan
;
Li, Yaw-Kuen
Water-soluble germanium nanoparticles (wsGeNPs) with allyamine-conjugated surfaces were fabricated and emit blue fluorescence under ultraviolet light. The wsGeNP was physically and chemically stable at various experimental conditions. Cytotoxicity of the fabricated wsGeNP was examined. KIT assay demonstrated that wsGeNP possessed high toxicity to cells and clonogenic survival assay further indicated that this effect was not resulted from retarding cell growth. Flow cytometric analysis indicated that wsGeNP did not alter the cell cycle profile but the sub-G1 fraction was absent from treated cells. Results from DNA fragmentation and propidium iodide exclusion assays also suggested that apoptotic cell death did not occur in cells treated with wsGeNP. Addition of a necrosis inhibitor, necrostatin-1, attenuated cell damage and indicated that wsGeNP caused necrotic cell death. Cell signaling leads to necrotic death was investigated. Intracellular calcium and reactive oxygen species (ROS) levels were increased upon wsGeNP treatment. These effects can be abrogated by BAPTA-AM and N-acetyl cysteine respectively, resulting in a reduction in cell damage. In addition, wsGeNP caused a decrease in mitochondrial membrane potential (MMP) which could be recovered by cyclosporine A The cellular signaling events revealed that wsGeNP increase the cellular calcium level which enhances the production of ROS and leads to a reduction of MMP, consequentially results in necrotic cell death. (C) 2011 Elsevier Ireland Ltd. All rights reserved.
Photo-polymerization of photocurable resins containing polyhedral oligomeric silsesquioxane methacrylate
(2011-12-15)
Lin, Ho-May
;
Wu, Shi-Yin
;
Chang, Feng-Chih
;
Yen, Ying-Chieh
;
應用化學系
Photocurable resins, bisphenol A propoxylate glycerolate diacrylate (BPA-PGDA, containing two hydroxyl) and bisphenol A propoxylate diacrylate (BPA-PDA), with fixed photoinitiator (Irgacure 907) concentration and various contents of methacrylisobutyl polyhedral oligomeric silsesquioxane (MI-POSS) were prepared and characterized by FTIR spectroscopy, scanning electron microscope and differential photocalorimetry. The MI-POSS molecules form crystals or aggregated particles in the cured resin matrix. The BPA-PGDA series photocurable resins show higher viscosity and lower photo-polymerization reactivity than the BPA-PDA series resins. The photo-polymerization rate and conversion of BPA-PGDA series are improved with increasing MI-POSS content. On the contrary, the photo-polymerization behavior of BPA-PDA series photocurable resins remains nearly unchanged by the addition of MI-POSS. Hydrogen-bonding interaction between the hydroxyl of BPA-PGDA and the siloxane of MI-POSS tends to attract and concentrate these acrylate double bonds around MI-POSS particles and thus enhances the photo-polymerization rate and conversion. (C) 2011 Elsevier B.V. All rights reserved.
無線通訊傳送及接收系統及其方法
(2011-12-16)
馬峻楹
;
黃家齊
本發明提供一種無線通訊傳送及接收系統及其方法，其包括具複數個傳送天線之傳送端及具複數個接收天線之接收端，首先，令已取得複數個通道狀態資訊之傳送端分析該複數個通道狀態資訊，以預先於該複數個接收天線中選擇一者作為使用天線，再對欲傳送之無線訊號進行匹配該使用天線之處理，接著，傳輸該經匹配處理之無線訊號至該接收端，由該接收端對該經匹配處理之無線訊號進行演算，以判斷出該傳送端所預先選擇之使用天線。據此，可於接收端未知通道狀態資訊的情形下判斷出傳送端所預先選擇的使用天線，進而達到大幅降低接收端複雜度之功效。
車輛資訊傳輸與接收方法及系統
(2011-12-16)
吳炳飛
;
李彥鋒
;
高志忠
;
陳盈翰
;
陳昭榮
本發明提供一種車輛資訊傳輸與接收方法及系統，其係在一車輛內設置一無線傳輸與接收單元以及記錄關於該車輛之一第一資訊之一行車電腦，並且於一站點內設置一處理電腦。當該車輛進入該站點時，該車輛以無線傳輸之方式將該第一資訊傳輸至該處理電腦。最後，該處理電腦於一時間點以無線傳輸之方式傳輸一第二資訊給該車輛之行車電腦。藉由本發明之方法與系統可以利用無線的方式進行第一資訊傳輸與更新，進而可以節省保養與管理所等待之時間。
一種自動化專利交易平台系統
(2011-12-16)
李鎮宜
;
黃經堯
;
張志華
;
吳志偉
;
吳怡如
本發明揭露一種自動化專利交易平台系統，其主要元件包括有專利資料庫，會員資料庫，媒合運算裝置，分享運算裝置，非會員資料庫，以及授權與買賣運算裝置等元件以相互連接組合而成。本發明之操作方法亦可分為包括會員與非會員加入之方法，以及僅有會員加入之操作方法；故而本發明可提高專利的交易效率且能降低專利交易成本。
背光模組
(2011-12-16)
田仲豪
;
洪健翔
;
簡銘進
;
林至宏
本發明係揭露一種背光模組，其包含一光學基板、至少一光管及至少一第一光源。其中，光學基板上設有至少一容置槽，且各容置槽係容置呈柱狀之光管。而第一光源則設於光管的一端，其係發出至少一第一光線，並將第一光線射入光管中。第一光線係於光管中被傳遞，且第一光線更被光學基板反射而離開光管。
藝術與色情　誰說了算
(2011-12-18)
陳燕珩
;
Department of Communication and Technology
;
傳播與科技學系
國際知名的法國秀場表演「瘋馬秀」17日在台灣結束演出，表演前台灣媒體爭相報導這個世界級的高規格歌舞秀，然而其中最引人矚目的女體上空表演內容，卻引發各界人士爭議不斷，再度掀起藝術與色情的話題。
星光幫發光發亮
(2011-12-18)
楊廣培
;
Department of Communication and Technology
;
傳播與科技學系
2007年，很多被忘記的歌、被埋沒的人，因為一個節目得到了平反的機會。
末日之聲　第二人生
(2011-12-18)
陳建安
;
Department of Communication and Technology
;
傳播與科技學系
這是世界上最後一張五月天CD，除非2012不是世界末日：「如果明天的太陽依然升起，我們開始第二個人生吧。」五月天睽違三年的作品，2012末日前最後一張專輯，請大家一同品味。
低碳新生活　你我知多少
(2011-12-18)
劉玉蘋
;
Department of Communication and Technology
;
傳播與科技學系
你知道日常生活中，不論食衣住行育樂，都會排放出二氧化碳嗎？