Browsing by Issue Date, starting with "2012-07-16"

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Near-field scanning optical microscopy using a super-resolution cover glass slip
(2012-07-16)
Lin, Yu-Hsuan
;
Tsai, Din Ping
;
電子物理學系
;
Department of Electrophysics
This study presents a novel near-field optics technology. A near-field cover glass slip (NF-CGS) was developed to improve the resolution of optical microscopy beyond the diffraction limit. A multi-layered structure of cover glass/ZnS-SiO2 (130 nm)/AgOx (15 nm)/ ZnS-SiO2 (40 nm) was employed to generate the optical coupling effect for increasing the contrast and enhancing resolution of imaging. This novel innovation is expected to be employed in near-field imaging techniques for samples in different environments because of its simplicity, rapid laser scanning, and minimal costs. Experimental results of 500 nm, 200 nm, and 100 nm standard polystyrene nanospheres on NF-CGS and normal cover glass are demonstrated and imaged by using a laser scanning confocal microscope. (C) 2012 Optical Society of America
Control of growth and inflammatory response of macrophages and foam cells with nanotopography
(2012-07-16)
Mohiuddin, Mohammed
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Pan, Hsu-An
;
Hung, Yao-Ching
;
Huang, Guewha Steven
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材料科學與工程學系
Macrophages play an important role in modulating the immune function of the human body, while foam cells differentiated from macrophages with subsequent fatty streak formation play a key role in atherosclerosis. We hypothesized that nanotopography modulates the behavior and function of macrophages and foam cells without bioactive agent. In the present study, nanodot arrays ranging from 10aEuro to 200aEuronm were used to evaluate the growth and function of macrophages and foam cells. In the quantitative analysis, the cell adhesion area in macrophages increased with 10- to 50-nm nanodot arrays compared to the flat surface, while it decreased with 100- and 200-nm nanodot arrays. A similar trend of adhesion was observed in foam cells. Immunostaining, specific to vinculin and actin filaments, indicated that a 50-nm surface promoted cell adhesion and cytoskeleton organization. On the contrary, 200-nm surfaces hindered cell adhesion and cytoskeleton organization. Further, based on quantitative real-time polymerase chain reaction data, expression of inflammatory genes was upregulated for the 100- and 200-nm surfaces in macrophages and foam cells. This suggests that nanodots of 100aEuroaEuro parts per thousand and 200aEuronm triggered immune inflammatory stress response. In summary, nanotopography controls cell morphology, adhesions, and proliferation. By adjusting the nanodot diameter, we could modulate the growth and expression of function-related genes in the macrophages and foam cell system. The nanotopography-mediated control of cell growth and morphology provides potential insight for designing cardiovascular implants.
一種可見光複合觸媒組合物及其形成方法
(2012-07-16)
謝文彬
;
黃志彬
;
袁如馨
;
蘇育俊
;
朱敏嘉
本發明係提供一種可見光複合觸媒組合物及其形成方法。本發明之複合觸媒薄膜組合物包括光觸媒及有機或無機薄膜，且光觸媒擔載於薄膜表面。本發明之可見光複合觸媒薄膜組合物可用於水處理與水回收、空氣污染處理與室內空氣淨化或地下水整治。
一種平整化氮化物基板的方法
(2012-07-16)
李威儀
;
陳奎銘
;
吳尹豪
;
葉彥顯
本發明揭露一種平整化氮化物基板的方法,首先選擇獨立式氮化物基板的特定面向,對該面向進行蝕刻,在經過適度的蝕刻時間後,該特定面向的表面會產生特定的形貌,如柱狀或洞狀或平坦狀等結構,從而降低獨立式氮化物基板的翹曲程度以達到平整化氮化物基板的效果。
Extended-reach access network with downstream radio-over-fiber (ROF) signal and upstream NRZ signal using orthogonal-WDM
(2012-07-16)
Chow, C. W.
;
Huang, S. P.
;
Yang, L. G.
;
Yeh, C. H.
;
光電工程學系
We propose and demonstrate an extended-reach radio-over-fiber (ROF) access network. The double-sideband carrier-suppressed (DSCS) optical signal carries the downstream ROF signal. A continuous wave (CW) optical carrier is embedded into the DSCS optical signal and transmitted to the colorless optical networking unit (ONU)/remote antenna unit (RAU) for the upstream signal generation. At the ONU/RAU, the upstream data is orthogonally wavelength division multiplexed (WDM) onto this CW carrier; hence mitigating the cross-talk generated by the downstream signal. Analyses about the optimum power difference between the downstream and the CW signals; as well as the split-ratio are also preformed. (C) 2012 Optical Society of America
光學全像資料讀取系統
(2012-07-16)
孫慶成
;
余業緯
;
吳啟守
;
林烜輝
本發明係關於一種光學全像資料讀取系統,係配合一記錄裝置,用於讀取儲存於記錄裝置之資料,該系統包括:一光發射裝置,用以發射一讀取光束至記錄裝置之複數個記錄位置以分別產生複數個反射光束,其中該等記錄位置係對應至記錄裝置表面一特定位置,並分別位於一預定深度;一感測裝置,係接收該等反射光束,且該等反射光束分別成像於感測裝置之不同位置;以及一控制裝置,係分別與光發射裝置及感測裝置耦合,以控制光發射裝置,並將該等反射光束於感測裝置的複數個成像對應轉換為複數個訊號,以讀取出記錄於記錄裝置上之資料。
Growth of sparse arrays of narrow GaN nanorods hosting spectrally stable InGaN quantum disks
(2012-07-16)
Chen, Yen-Ting
;
Tsai, Wen-Che
;
Chen, Wen-Yen
;
Hsiao, Ching-Lien
;
Hsu, Hsu-Cheng
Wafer-scale production of single InGaN quantum disks (QD) in-a-nanorod array with small rod diameter (> 9 nm) and low rod-density (< 10(8) cm(-2)) has been achieved without extensive processing steps. Excitation power-dependent mu PL spectrum of single QD reveals multi-excitonic peak with 0.75 meV blue-shift for 3 orders of magnitude increasing power, indicating the present system is spectrally stable and nearly free of quantum-confined Stark effects, due possibly to the strain relaxation induced by free surface of small rod diameters. The fully polarized emissions, a high working temperature (180 K), low rod density and good alignment, render this system promising as a potential quantum photon source. (C) 2012 Optical Society of America
Investigation of 4-ASK modulation with digital filtering to increase 20 times of direct modulation speed of white-light LED visible light communication system
(2012-07-16)
Yeh, C. H.
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Liu, Y. F.
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Chow, C. W.
;
Liu, Y.
;
Huang, P. Y.
In this demonstration, we propose and experimentally investigate the quaternary-amplitude-shift-keying (4-ASK) modulation with digital filtering to enhance the direct modulation speed of white-light light-emitting-diode (LED) in visible light communication (VLC) system. Here, an ordinary LED commercially available for lighting application with a direct modulation speed of 1 MHz is used. Data rate of 20 Mbit/s can be achieved in a 1 m free space transmission without using optical blue filter. In the previous studies, the transmission rate of LED VLC could only be increased by 2 to 10 times of the direct modulation speed of the white-light LED if using electrical equalization only. Moreover, the adaptive-controlled FIR filter makes the system closer to the matched filtering condition for reducing the inter-symbol-interference (ISI) for the LED VLC. A recorded 20 times enhancement of the direct modulation speed of white-light LED VLC system is demonstrated by using digital filter only and without using optical blue filter. (C) 2012 Optical Society of America
多軸慣性微動系統
(2012-07-16)
洪紹剛
;
鄭喬華
;
林建宇
本發明係有關於一種多軸慣性微動系統，包括有一基座、一第一固定板、一第二固定板、一第一壓電致動器、一第二壓電致動器、一承載台、及一控制器。第一壓電致動器與第二壓電致動器之每一者產生位移之二端係分別連接於第一固定板、與第二固定板。控制器係分別控制輸入第一壓電致動器之電壓、及第二壓電致動器之電壓，致使承載台相對於基座產生移動或旋轉位移。因此，本發明藉由將兩壓電致動器以並聯方式設置，以達到多自由度奈米級之定位同時，結構保持緊緻且體積保持小巧。
Nanoindentation of GaSe thin films
(2012-07-17)
Jian, Sheng-Rui
;
Ku, Shin-An
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Luo, Chih-Wei
;
Juang, Jenh-Yih
;
電子物理學系
The structural and nanomechanical properties of GaSe thin films were investigated by means of X-ray diffraction (XRD) and nanoindentation techniques. The GaSe thin films were deposited on Si(111) substrates by pulsed laser deposition. XRD patterns reveal only the pure (000 l)-oriented reflections originating from the hexagonal GaSe phase and no trace of any impurity or additional phases. Nanoindentation results exhibit discontinuities (so-called multiple 'pop-in' events) in the loading segments of the load-displacement curves, and the continuous stiffness measurements indicate that the hardness and Young's modulus of the hexagonal GaSe films are 1.8 +/- 0.2 and 65.8 +/- 5.6 GPa, respectively.
Electroabsorption and Electrophotoluminescence of Poly(2,3-diphenyl-5-hexyl-p-phenylene vinylene)
(2012-07-19)
Mehata, Mohan Singh
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Hsu, Chain-Shu
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Lee, Yuan-Pern
;
Ohta, Nobuhiro
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應用化學系
Electric-field-induced changes of the absorption, photoluminescence, and photoluminescence excitation spectra and the photoluminescence decay profile have been measured for poly(2,3-diphenyl-5-hexyl-p-phenylene vinylene). The magnitudes of the change of electric dipole moment and molecular polarizability of this compound have been determined for excitation into the first excited state having a strong absorption, and a large charge-separated character, which is relevant for photovoltaic devices, is confirmed. The photoluminescence of this compound is quenched by application of an electric field, and the quenching efficiency increases with decreasing excitation wavelength. Field-assisted dissociation is considered to occur from the photoexcited Franck-Condon state, resulting in the field-induced decrease in the population of the emitting state, which induce the quenching of photoluminescence.
Frame Prediction System and Prediction Method Thereof
(2012-07-19)
PENG WEN-HSIAO
;
CHEN YI-WEN
The present invention discloses a frame prediction system and a prediction method thereof. An initializing module initializes a first image block having a plurality of pixels. A providing module provides a first centroid and a first motion vector of a second image block. The location lookup module finds a location according to the first centroid, and generates a first weight and a second weight respectively according to a relationship between each of the pixels, the first centroid and the location. A vector lookup module finds a second motion vector, which gives a minimum pixel intensity error for the plurality of pixels in the first image block according to the first centroid, the first motion vector, the location, the first weight and the second weight. A processing module sequentially calculates a plurality of predictive intensity values according to the motion vectors and the weights.
Method for smoothing group lll nitride semiconductor substrate
(2012-07-19)
Lee Wei-I
;
Chen Kuei-Ming
;
Wu Yin-Hao
;
Yeh Yen-Hsien
The invention discloses a smoothing method to decrease bowing of group III nitride semiconductor substrate. The certain face of group III nitride semiconductor substrates is etched under the appropriate etching recipe and time, the certain morphology such as rod-type and other structures are appeared at the certain face. And such structures releases the compressive stresses at these certain faces, resulting in clearly increasing the bowing radius of the group III nitride semiconductor substrates, finally decreasing the bowing phenomenon of the group III nitride semiconductor substrate.
Fracture responses of microstructures of electron beam-welded D6AC
(2012-07-20)
Wu, Shyh-Chi
;
Wen, Hua-Chiang
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Wu, Ming-Jhang
;
Chou, Chang-Pin
;
機械工程學系
In this study, D6AC steel was produced from flow forming (wall thickness reduction: 67%) and then it was subjected to electron beam welding and tempering treated. We characterized the specimens in terms of their microstructures and nanotribological properties. After tempering treatment at 315 degrees C, the yield strength increased from 381 to 1334 MPa and the percentage elongation increased remarkably from 0.5 to 7.8%. We performed these mechanical studies for the samples subjected to each set of experimental conditions, and determined the tribological characteristics from the heat-affected zone and the fusion zone. Lower degrees of adhesion reflected the presence of interlinks and rearrangements of indenter tip at lateral force that have been responsible for fluctuations in the coefficients of friction. (C) 2012 Elsevier Ltd. All rights reserved.
交大e-News第122期
(2012-07-20)
Secretariat
;
國立交通大學秘書室
A novel peristaltic micropump with low compression ratios
(2012-07-20)
Tsui, Yeng-Yung
;
Chang, Tso-Chang
;
機械工程學系
;
Department of Mechanical Engineering
It is common for peristaltic micropumps to have large compression ratios. In the limit, the chamber of the pump is completely blocked by the membrane to prevent back flow. Different from this kind of pump, a micropump with small compression ratios is proposed in this study. With small oscillation amplitudes the membrane of the pump can reciprocate at high frequencies to improve its pumping flow. Both the multidimensional method and the lumped-element method are employed for analysis. For this kind of peristaltic micropump the working fluid is allowed to flow freely in the forward and backward directions. Therefore, the operating sequences for the high-compression ratio type of pumps are not appropriate. It is shown that the theoretical net flow rate is zero for the four-phase and six-phase modes of sequence and becomes negative for the three-phase mode unless regulators, such as the nozzle/diffusers, are incorporated to rectify the flow. However, this pump becomes very attractive by reversing the operating sequence of the three-phase mode because positive net flow is yielded. It is seen that with the reversed three-phase mode and the nozzle/diffuser as connecting channels, the pumping effectiveness is greatly enhanced. The pumps with both two chambers and three chambers are under consideration in the study. Copyright (c) 2011 John Wiley & Sons, Ltd.
顯示器
(2012-07-21)
范士岡
;
邱誠樸
;
莫啟能
;
江美昭
一種顯示器包括一第一基板、一第一電極、一第二基板、一第二電極與一混合溶液。其中，第一電極配置於第一基板上，而第二電極配置於第二基板上。此外，混合溶液配置於第一電極與第二電極之間。本發明之混合溶液包括一溶液與多個配置於溶液中之第一中性微粒子。
Evidence of Sharp and Diffuse Domain Walls in BiFeO3 by Means of Unit-Cell-Wise Strain and Polarization Maps Obtained with High Resolution Scanning Transmission Electron Microscopy
(2012-07-25)
Lubk, A.
;
Rossell, M. D.
;
Seidel, J.
;
He, Q.
;
Yang, S. Y.
Domain walls (DWs) substantially influence a large number of applications involving ferroelectric materials due to their limited mobility when shifted during polarization switching. The discovery of greatly enhanced conduction at BiFeO3 DWs has highlighted yet another role of DWs as a local material state with unique properties. However, the lack of precise information on the local atomic structure is still hampering microscopical understanding of DW properties. Here, we examine the atomic structure of BiFeO3 109 degrees DWs with pm precision by a combination of high-angle annular dark-field scanning transmission electron microscopy and a dedicated structural analysis. By measuring simultaneously local polarization and strain, we provide direct experimental proof for the straight DW structure predicted by ab initio calculations as well as the recently proposed theory of diffuse DWs, thus resolving a long-standing discrepancy between experimentally measured and theoretically predicted DW mobilities.
Prediction of Carbohydrate Binding Sites on Protein Surfaces with 3-Dimensional Probability Density Distributions of Interacting Atoms
(2012-07-25)
Tsai, Keng-Chang
;
Jian, Jhih-Wei
;
Yang, Ei-Wen
;
Hsu, Po-Chiang
;
Peng, Hung-Pin
Non-covalent protein-carbohydrate interactions mediate molecular targeting in many biological processes. Prediction of non-covalent carbohydrate binding sites on protein surfaces not only provides insights into the functions of the query proteins; information on key carbohydrate-binding residues could suggest site-directed mutagenesis experiments, design therapeutics targeting carbohydrate-binding proteins, and provide guidance in engineering protein-carbohydrate interactions. In this work, we show that non-covalent carbohydrate binding sites on protein surfaces can be predicted with relatively high accuracy when the query protein structures are known. The prediction capabilities were based on a novel encoding scheme of the three-dimensional probability density maps describing the distributions of 36 non-covalent interacting atom types around protein surfaces. One machine learning model was trained for each of the 30 protein atom types. The machine learning algorithms predicted tentative carbohydrate binding sites on query proteins by recognizing the characteristic interacting atom distribution patterns specific for carbohydrate binding sites from known protein structures. The prediction results for all protein atom types were integrated into surface patches as tentative carbohydrate binding sites based on normalized prediction confidence level. The prediction capabilities of the predictors were benchmarked by a 10-fold cross validation on 497 non-redundant proteins with known carbohydrate binding sites. The predictors were further tested on an independent test set with 108 proteins. The residue-based Matthews correlation coefficient (MCC) for the independent test was 0.45, with prediction precision and sensitivity (or recall) of 0.45 and 0.49 respectively. In addition, 111 unbound carbohydrate-binding protein structures for which the structures were determined in the absence of the carbohydrate ligands were predicted with the trained predictors. The overall prediction MCC was 0.49. Independent tests on anti-carbohydrate antibodies showed that the carbohydrate antigen binding sites were predicted with comparable accuracy. These results demonstrate that the predictors are among the best in carbohydrate binding site predictions to date.
CARRIER COMPONENT AND FABRICATION METHOD THEREOF
(2012-07-26)
Liu Dean-Mo
;
Chang Chun Yu
;
Chou Fu Hsuan
;
Yen Tin-Yo
The present invention provides a carrier component. The carrier component includes a carrier core body including a dispersive object and a dualistic self-assembly material for encapsulating the dispersive object, wherein the dualistic self-assembly material has an electric charge; and a first shell layer having an electric charge opposite to the electric charge of the dualistic self-assembly material, and coating the carrier core body, and thus avoids inactivation of a medicine, eliminates medicine leakage and reduces medicine releasing. The present invention further provides a method for forming a carrier component.