Browsing by Issue Date, starting with "2008-10-13"

Now showing 1 - 20 of 54397

Multilayer polymer light-emitting diodes by blade coating method
(2008-10-13)
Tseng, Shin-Rong
;
Meng, Hsin-Fei
;
Lee, Kuan-Chen
;
Horng, Sheng-Fu
;
物理研究所
Multilayer polymer light-emitting diodes fabricated by blade coating are presented. Multilayer of polymers can be easily deposited by blade coating on a hot plate. The multilayer structure is confirmed by the total thickness and the cross section view in the scanning electron microscope. The film thickness variation is only 3.3% in 10 cm scale and the film roughness is about 0.3 nm in the micron scale. The efficiency of single layer poly(para-phenylene vinylene) copolymer Super Yellow and poly(9,9-dioctylfluorene) (PFO, deep blue) devices are 9 and 1.7 cd/A, respectively, by blade coating. The efficiency of the PFO device is raised to 2.9 cd/A with a 2-(4-tert-butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) hole-blocking layer and to 2.3 cd/A with a poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4(')-(N-(4-sec-butylphenyl))diphenylamine)] elec-tron-blocking layer added by blade coating. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2999541]
Effect of free electrons on nanoparticle charging in a negative direct current corona charger
(2008-10-13)
Aliat, A.
;
Tsai, C. -J.
;
Hung, C. -T.
;
Wu, J. -S.
;
機械工程學系
A two-dimensional numerical model is proposed in this letter to take into account the effects of free electrons on nanoparticle charging in a negative direct current wire-tube corona charger. Numerical results are in excellent agreement with the experimental data by using a capturing probability of electrons onto nanoparticles with a value of 0.013. These free electrons contribute greatly to the charging efficiency at high products of mean ion concentration and mean residence time, which explains very well the large discrepancy found in earlier models that considered only negative ions. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2967470]
Integrated multiple multi-photon imaging and Raman spectroscopy for characterizing structure-constituent correlation of tissues
(2008-10-13)
Jhan, Jhen-Wei
;
Chang, Wei-Tien
;
Chen, Hung-Che
;
Lee, Yu-Tsung
;
Wu, Ming-Fang
Histopathological imaging of tissues often requires extensive sample preparation including fixation and staining in order to highlight characteristic alterations associated with diseases. Herein, we report an integrated spectro-microscopy approach based on a combination of multimodal multi-photon imaging and Raman micro-spectroscopy and demonstrate label-free characterization of the structure-constituent correlation of porcine skin. The multi-modal imaging allows the visualization of dermatological features whereas Raman micro-spectroscopy enables the identification of their 'molecular fingerprints'. By obtaining both structural and molecular-level information of tissue constituents, this integrated approach can offer new insight into the patho-physiological status of tissues. (c) 2008 Optical Society of America
Geometrical correlations of quantum dots in InAs/GaAs superlattice structure from electron tomography
(2008-10-13)
Wu, Y. H.
;
Chang, L.
;
Chen, L. C.
;
Chen, H. S.
;
Chen, F. R.
In this study, the three-dimensional (3D) information about the structural properties of quantum dots (QDs) in InAs/GaAs superlattice structure has been illustrated using electron tomography in the mode of high-angle angular dark-field scanning transmission electron microscopy. Comparison of this 3D reconstruction with the two-dimensional projection at the same positions is made. The structural properties of embedded quantum dots have been evaluated from electron tomography. The correlation relationship of QDs in superlattice structure has been understood by accurate measurements of 3D geometric positions, which can be free of the overlapping effect from 2D cross section along different crystallographic orientations. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2998693]
Stable Q-switched mode-locked Nd3+:LuVO4 laser by Cr4+:YAG crystal
(2008-10-13)
Lin, Ja-Hon
;
Chen, Hou-Ren
;
Hsu, Hsin-Han
;
Wei, Ming-Dar
;
Lin, Kuei-Huei
In use of saturable Cr4+:YAG crystals, we have demonstrated the stable Q-switched and mode-locked (QML) operation of the Nd:LuVO4 laser. The operation range of QML in use of the Cr4+:YAG is larger than that use of SESAM and NLM. The obtained shape of Q-switched envelope, repetition rate and pulse energy are demonstrated to depend on the initial transmittance of the Cr4+:YAG and reflectivity of the output coupler. Using R = 60% and T-0 = 40%, the highest pulse energy of 77 mu J of each Q-switched envelope, and the highest peak power about 200 kW of Q-switched mode-locked pulses can be obtained at 15 W pump power. It demonstrate the superior characteristic of the Nd:LuVO4 crystal. (C) 2008 Optical Society of America
Polypeptide diblock copolymers: Syntheses and properties of poly(N-isopropylacrylamide)-b-polylysine
(2008-10-14)
Huang, Cheng-Jyun
;
Chang, Feng-Chih
;
應用化學系
;
Department of Applied Chemistry
A hydrolysis-resistant amide-linkage heterofunctional initiator was synthesized and used successfully for polymerization of well-defined rod-coil block copolymers poly(N-isopropylacrylamide)-b-poly(Z-L-lysine) (PNIPAm-b-PZLys) by combination of atom transfer radical polymerization (ATRP) and amine hydrochloride mediated ring-opening polymerization (ROP). The ATRP of NIPAm was carried out at 0 degrees C using CuBr/Me6TREN complex in 2-propanol and resulted in narrow polydispersity and high monomer conversion. The amine hydrochlorides have replaced the primary amine in the PNIPAm macroinitiator resulting in a well-controlled ROP of N-epsilon-(carbobenzoxy)-L-lysine N-carboxyanhydride in DMF at 20 degrees C. These amphiphilic block copolymers are able to form universal micelle morphologies of spherical micelles, wormlike micelles, and vesicles by varying the polymer compositions and the helicogenic common solvents. From synchrotron SAXS, WAXS, and TEM results, the PNIPAm-b-PZLys microphase self-assembly morphology in solid state is a hierarchical lamellar-in-hexagonal structure. After the protective epsilon-benzyloxycarbonyl group is removed, the dual stimuli-responsive behaviors of the PNIPAm-b-PLys investigated by nuclear magnetic resonance spectroscopy in aqueous solution resulted in either coil-to-helix or coil-globule transition by changing the environmental condition of elevating the temperature or increasing the pH value.
Electrostatic discharge protection circuit using a double-triggered silicon controlling rectifier
(2008-10-14)
Ker
;
Ming-Dou
;
Hsu
;
Kuo-Chun
An ESD protection circuit using a double-triggered silicon controller rectifier (SCR). The double-triggered silicon controller rectifier (SCR) includes N+ diffusion areas, P+ diffusion areas, a first N-well region, a second N-well region and a third N-well region formed in a P-substrate. The N+ diffusion areas and the P+ diffusion areas are isolated by shallow trench isolation (STI) structures. Two of the N+ diffusion areas are N-type trigger terminals. Two of the P+ diffusion areas are the P-type trigger terminal.
Pseudo-single-crystalline self-assembled structure formed from hydrophilic CdSe and hydrophobic an nanoparticles in the polystyrene and poly(4-vinylpyridine) blocks, respectively, of a polystyrene-b-poly(4-vinylpyridine) diblock copolymer
(2008-10-14)
Huang, Ching-Mao
;
Wei, Kung-Hwa
;
材料科學與工程學系
;
Department of Materials Science and Engineering
環境保護與社會關懷
(2008-10-14)
陳阿桃
;
開放教育推動中心
;
Open Education Office
課程日期： 2008年10月14日(三) 演講人：陳阿桃女士內容摘要：陳阿桃女士是資深慈濟委員，說話帶著濃濃的鄉土味，是大愛電視台八點檔「阿桃」故事的本尊。她跟隨慈濟從事社會慈善與資源回收多年，本著「說我所做、做我所說」的理念。內容：影音實況影音(*.flv檔)
Morphological control of CuPc and its application in organic solar cells
(2008-10-15)
Hsiao, Yu-Sheng
;
Whang, Wha-Tzong
;
Suen, Shich-Chang
;
Shiu, Jau-Ye
;
Chen, Chih-Ping
We have prepared organic photovoltaic (OPV) cells possessing an ideal bulk heterojunction (BHJ) structure using the self-assembly of copper phthalocyanine (CuPc) as the donor material and fullerene (C(60)) as the acceptor. The variable self-assembly behavior of CuPc on a diverse range of substrates (surface energies) allowed us to control the morphology of the interface and the degree of carrier transportation within the active layer. We observed rod-like CuPc structures on indium-tin oxide (ITO), poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT: PSS) and Au substrates. Accordingly, the interfaces and continuing transport path between CuPc and fullerene domains could be greatly improved due to the ideal BHJ structure. In this paper, we discuss the mechanisms of producing CuPc rod-like films on ITO, PEDOT: PSS and Au. The OPV cell performance was greatly enhanced when a mixture of horizontal and vertical CuPc rods was present on the PEDOT: PSS surfaces, i.e. the power conversion efficiency was 50 times greater than that of the corresponding device featuring a planar CuPc structure.
Influence of Zn/O flux ratio and Mn-doped ZnO buffer on the plasma-assisted molecular beam epitaxy of ZnO on c-plane sapphire
(2008-10-15)
Wang, J. S.
;
Yang, C. S.
;
Liou, M. J.
;
Wu, C. X.
;
Chiu, K. C.
This work investigated the influence of Zn/O flux ratio and Mn-doped ZnO buffer layer on the epitaxial growth of ZnO grown by plasma-assisted molecular beam epitaxy on c-plane sapphire substrates. Atomic force microscopy (AFM), photoluminescence (PL) and X-ray diffraction (XRD) measurements indicated that a small amount residual strain of ZnO epilayers was further relaxed under stoichiometric growth conditions due to the better surface migration of the adatoms. Moreover, we observed that a small amount of Mn doping led to obtain a flatter surface with stronger lattice relaxation maybe due to the greatly enhanced surface migration of the adatoms. By adding a Mn-doped ZnO buffer layer the optical and electrical properties of the ZnO epilayers had significant improvement. (c) 2008 Elsevier B.V. All rights reserved.
Enhancement of bifunctional catalysis by Ir doping of La0.6Ca0.4CoO3 perovskites
(2008-10-15)
Chang, Yun-Min
;
Hsieh, Yu-Chi
;
Wu, Pu-Wei
;
Lai, Chun-Han
;
Chang, Tin-Yu
La0.6Ca0.4Co0.8Ir0.2O3 was prepared by solid state reaction synthesis from mixtures of La(NO3)(3)center dot 6H(2)O, Ca (NO3)(2)center dot 4H(2)O, Co(NO3)(3)center dot 6H(2)O, and IrO2 at stoichiometric ratio. Images from scanning electron microscopy on the as-synthesized powders exhibited particles in irregular shape at 100-250 nm in size. X-ray diffraction analysis confirmed the formation of perovskite without the rutile signals from IrO2, suggesting successful incorporation of Ir4+ at the Co cation sites. The carbon nanocapsules (CNCs) were used as an electrocatalyst support. Electrodes for electrochemical measurements were fabricated by depositing mixtures of CNCs, La0.6Ca0.4Co0.8Ir0.2O3 and polymeric binders on commercially available noncatalyzed gas diffusion electrodes. In alkaline electrolyte, the La0.6Ca0.4Co0.8Ir0.2O3/CNCs demonstrated superior performances than those of La0.6Ca0.4Co0.8Ir0.2O3/CNCs and IrO2/CNCs in both charging and discharging current-potential polarization measurements. (c) 2008 Elsevier B.V. All rights reserved.
Identification of amino acid residues important for the phosphomannose isomerase activity of Ps1B in Pseudomonas aeruginosa PAO1
(2008-10-15)
Lee, Hui-Ju
;
Chang, Hwan-You
;
Venkatesan, Nandinin
;
Peng, Hwei-Ling
;
生物科技學院
Phosphomannose isomerase (PMI) plays a pivotal role in biosynthesis of GDP-mannose, an important precursor of many polysaccharides. We demonstrate in this study that Pseudomonas aeruginosa pslB encodes a protein with GDP-mannose pyrophosphorylase/PMI dual activities. The PMI activity is Co2+-dependent and could be inhibited by GDP-mannose in a competitive manner. Furthermore, the activity could be inactivated by 2,3-butanedione suggesting the presence of a catalytic Arg residue. Site-specific mutations at R373, R472, R479, E410, H411, N433 and E458 increase the KM approximately 8-20-fold. The PMI activity of PslB was completely diminished with a R408K or R408A, reflecting the importance of this residue in catalysis. Overall, these results provide a basis for understanding the catalytic mechanism of PMI.
可發綠光之螢光體及其製法
(2008-10-16)
陳登銘
;
邱奕禎
本發明之可發綠光螢光體,化學式為M(Tb1-xLax)4Si3O13,其中M包括Ca、Sr或其組合,且0<x<1,依適當配比混合後,含氧氣氛下高溫燒結而成;將所製得之螢光體經378 nm之近紫外光激發後,可放射主峰為541 nm之綠光,其綠光放射之CIE座標之x値介於0.34-0.37之間,且y値介於0.52-0.55之間。本發明可發綠光螢光體之製作步驟包括:秤量與混勻材料粉體,於氣體氛圍下經高溫燒結而成。
Adaptive asymmetric fuzzy neural network controller design via network structuring adaptation
(2008-10-16)
Hsu, Chun-Fei
;
Lin, Ping-Zong
;
Lee, Tsu-Tian
;
Wang, Chi-Hsu
;
電控工程研究所
This paper proposes a self-structuring fuzzy neural network (SFNN) using asymmetric Gaussian membership functions in the structure and parameter learning phases. An adaptive self-structuring asymmetric fuzzy neural-network control (ASAFNC) system which consists of an SFNN controller and a robust controller is proposed. The SFNN controller uses an SFNN with structure and parameter learning phases to online mimic an ideal controller, simultaneously. The structure learning phase consists of the growing-and-pruning algorithms of fuzzy rules to achieve an optimal network structure, and the parameter learning phase adjusts the interconnection weights of neural network to achieve favorable approximation performance. The robust controller is designed to compensate for the modeling error between the SFNN controller and the ideal controller. An online training methodology is developed in the Lyapunov sense, and thus the stability of the closed-loop control system can be guaranteed. Finally, the proposed ASAFNC system is applied to a second-order chaotic dynamics system. The simulation results show that the proposed ASAFNC can achieve favorable tracking performance. (C) 2008 Elsevier B.V. All rights reserved.
System And Method Of Intelligent Surveillance And Analysis
(2008-10-16)
Wang, Yuan-Kai
;
Wang, Li-Ya
;
Hu, Yung-Hsiang
System and method of intelligent surveillance and analysis mainly used for monitoring whether a field has an intrusion object (such as a thief), and instantly providing video or image of the suspected intruder to approved relevant individual (such as the house owner) for further confirmation of the presence of the intrusion object (such as thief); therefore, the wrongful determination by the computer is avoided. The aforementioned system includes, first the determination and extraction of the contour of the suspected intrusion object, then the continuous tracking of the suspected intrusion object according to the contour, continue capturing of images using the camera, and then storing these captured video temporarily, and finally notifying the house owner using the highest definition image of the video which occupies a lesser amount of bandwidth through various communication channels once the presence of thief is determined; the video is downloaded using higher bandwidth, and is played.
Method for forming a semiconductor structure having nanometer line-width
(2008-10-16)
Chen, Szu-Hung
;
Lien, Yi-Chung
;
Chang, Edward Yi
A method for forming a semiconductor structure having a deep sub-micron or nano scale line-width is disclosed. Structure consisting of multiple photoresist layers is first formed on the substrate, then patterned using adequate exposure energy and development condition so that the bottom photoresist layer is not developed while the first under-cut resist groove is formed on top of the bottom photoresist layer. Anisotropic etching is then performed at a proper angle to the normal of the substrate surface, and a second resist groove is formed by the anisotropic etching. Finally, the metal evaporation process and the lift-off process are carried out and the Γ-shaped metal gate with nano scale line-width can be formed.
平順切換影像之視訊監控系統與方法
(2008-10-16)
洪一平
;
彭維廷
;
張禮薇
;
陳冠文
本發明為關於平順切換影像之監控系統與方法,主要使監視器上以平順切換影像的方式顯示監控對象的行動。此系統包含背景影像資料庫、第一攝影機、第二攝影機和監控裝置。背景影像資料庫係用以儲存實體空間的背景影像。第一攝影機係用以從第一角度拍攝實體空間中的監控對象,並獲得第一影像。第二攝影機係用以從第二角度拍攝實體空間中的監控對象,並獲得第二影像。監控裝置利用自動剪取監控對象的方法估測人物相對於環境的三維位置,隨著控對象的行動將適當的變形影像與相對角度的背景影像合成為平順切換影像。
導光板及其背光模組
(2008-10-16)
田仲豪
;
簡銘進
;
陳卓志
本發明係揭露一種導光板結構及其背光模組,適用於引導一光源之傳遞方向。此導光板結構至少包含一入光面、一出光面及一底面,其中,入光面具有至少一凹陷結構,此些凹陷結構之面上形成至少一微結構,且出光面垂直相連於入光面,底面相對於出光面,同時,在入光面之凹陷結構設置一相對光源裝置,即成為一背光模組。
畫素驅動電路及其驅動方法與應用
(2008-10-16)
蔡明憲
;
戴亞翔
本發明揭露一種畫素驅動電路及其驅動方法與應用,在不同的時序下,此畫素驅動電路中係分別藉由三個薄膜電晶體以做為儲存電容與液晶電容的開關,首先先對儲存電容充入足夠的電量,並且將液晶電容進行放電,最後,重置儲存電容與液晶電容之間的電荷以達到對液晶電容進行充電的目的。因此,藉由本發明之電路設計並同時配合上適當的時序控制,即使在應用色彩序列驅動法的顯示裝置中,係可避免停止逐列掃瞄來切換背光光源,故,畫素充電的時間與發光的時間皆不會縮短,同時亦可使顯示裝置在更高頻率下操作,以提供較佳的畫面品質。