Browsing by Issue Date, starting with "2012-05-07"

Now showing 1 - 20 of 36503

Voltage-tunable dual-band quantum dot infrared photodetectors for temperature sensing
(2012-05-07)
Ling, Hong-Shi
;
Wang, Shiang-Yu
;
Hsu, Wei-Cheng
;
Lee, Chien-Ping
;
電子工程學系及電子研究所
We report voltage-tunable 3-5 mu m & 8-12 mu m dual-band detection in the InAs/Al0.3Ga0.7As/In0.15Ga0.85As confinement-enhanced dots-in-a-well quantum dot infrared photodetectors. The capability in temperature sensing is also demonstrated. Distinct response peaks at 5.0 mu m and 8.6 mu m were observed in the photocurrent spectra with working temperature up to 140K. The two peaks correspond to the transition paths from the quantum dot ground state to the quantum well state and the quantum dot excited state, respectively. At 77K, the response ratio of the 8.6 mu m peak over the 5.0 mu m peak changes from 0.29 at -3V to 5.8 at + 4.8V. Excellent selectivity between the two peaks with bias voltage makes the device attractive for third-generation imaging systems with pixel-level multicolor functionality. (C)2012 Optical Society of America
交大e-News第117期
(2012-05-07)
Secretariat
;
國立交通大學秘書室
Optical properties and sub-bandgap formation of nano-crystalline Si quantum dots embedded ZnO thin film
(2012-05-07)
Kuo, Kuang-Yang
;
Hsu, Shu-Wei
;
Huang, Pin-Ruei
;
Chuang, Wen-Ling
;
Liu, Chuan-Cheng
In this study, we fabricate ZnO thin films with nano-crystalline Si (nc-Si) quantum dots (QDs) using a ZnO/Si multilayer deposition structure and a post-annealing process, and the formation of high crystallinity of Si QDs embedded in the crystalline ZnO matrix is demonstrated. For optical properties, the essential features of ZnO material, high transmission in long-wavelength and high absorption in short-wavelength ranges, are preserved. We observe significantly enhanced light absorption and an unusual photoluminescence emission peak contributed from the nc-Si QDs in the middle-wavelength range. In addition, we confirm the formation of optical sub-bandgap and the obtained value is quite close to the unusual PL emission peak. We show that meaningful sub-bandgap can form in ZnO thin film by embedding nc-Si QDs while maintaining the advantageous properties of ZnO matrix. This newly developed composite material, nc-Si QD embedded ZnO thin films, can be useful for various electro-optical applications. (C)2012 Optical Society of America
Nano-patterned glass superstrates with different aspect ratios for enhanced light harvesting in a-Si:H thin film solar cells
(2012-05-07)
Chen, Ting-Gang
;
Yu, Peichen
;
Tsai, Yu-Lin
;
Shen, Chang-Hong
;
Shieh, Jia-Min
Nano-patterned glass superstrates obtained via a large-area production approach are desirable for antireflection and light trapping in thin-film solar cells. The tapered nanostructures allow a graded refractive index profile between the glass and material interfaces, leading to suppressed surface reflection and increased forward diffraction of light. In this work, we investigate nanostructured glass patterns with different aspect ratios using scalable nanosphere lithography for hydrogenated amorphous silicon (a-Si:H) thin film solar cells. Compared to flat glass cell and Asahi U-type glass cell, enhancements in short-circuit current density (J(sc)) of 51.6% and 8%, respectively, were achieved for a moderate aspect ratio of 0.16. The measured external quantum efficiencies (EQE) spectra confirmed a broadband enhancement due to antireflection and light trapping properties. (C) 2012 Optical Society of America
Nitric Oxide Turn-on Fluorescent Probe Based on Deamination of Aromatic Primary Monoamines
(2012-05-07)
Shiue, Tsun-Wei
;
Chen, Yen-Hao
;
Wu, Chi-Ming
;
Singh, Gyan
;
Chen, Hsing-Yin
The stable, water-soluble, and nonfluorescent FA-OMe can sense nitric oxide (NO) and form the intensely fluorescent product dA-FA-OMe via reductive deamination of the aromatic primary amine. The reaction is accompanied by a notable increase of the fluorescent quantum yield from 1.5 to 88.8%. The deamination mechanism of FA-OMe with NO was proposed in this study. The turn-on fluorescence signals were performed by suppression of photoinduced electron transfer (PeT), which was demonstrated by density functional theory (DFT) calculations of the components forming FA-OMe and dA-FA-OMe. Furthermore, FA-OMe showed water solubility and good stability at physiological pHs. Moreover, the selectivity study indicated that FA-OMe had high specificity for NO over other reactive oxygen/nitrogen species. In an endogenously generated NO detection study, increasing the incubation time of FA-OMe with lipopolysaccharide (LPS) pretreated Raw 264.7 murine macrophages could cause an enhanced fluorescence intensity image. In addition, a diffusion/localization cell imaging study showed that FA-OMe could be trapped in Raw 264.7 cells. These cell imaging results demonstrated that FA-OMe could be used as a turn-on fluorescent sensor for the detection of endogenously generated NO.
Acoustic camera
(2012-05-08)
Bai Mingsian R.
;
Lin Jia-Hong
;
Liu Kuan-Liang
An acoustic camera comprises a first sound pick-up device, a second sound pick-up device, and a switch. The switch is respectively connected to the first sound pick-up device and the second pick-up device and used to select the first sound pick-up device or the second sound pick-up device to reconstruct the sound field of the sound source of a detected object. The first sound pick-up device has a first microphone array, and the first microphone array is a near-field uniform microphone array. The second sound pick-up device has a second microphone array, and the second microphone array is a far-field non-uniform microphone array.
Coplanar antenna unit and coplanar antenna
(2012-05-08)
Chen Fu-Chiarng
;
Kao Cheng-Lung
The present invention is related to a coplanar antenna unit and a coplanar antenna. By utilizing the unique properties of meta-material to design 1-D balanced CRLH leaky-wave antenna. The antenna can be realized with the coplanar antenna unit consisting of MIM capacitor and grounded inductor. In this invention, all proposed elements are implemented by planar print circuit broad, so the full-space switched beam scanning antenna has shorter length of leaky-wave antenna and good radiation performance.
METAL OXIDE THIN FILM TRANSISTOR AND MANUFACTURING METHOD THEREOF
(2012-05-10)
ZAN HSIAO-WEN
;
TSAI CHUANG-CHUANG
;
CHEN WEI-TSUNG
;
HSUEH HSIU-WEN
The instant disclosure relates to a metal oxide thin film transistor having a threshold voltage modification layer. The thin film transistor includes a gate electrode, a dielectric layer formed on the gate electrode, an active layer formed on the dielectric layer, a source electrode and a drain electrode disposed separately on the active layer, and a threshold voltage modulation layer formed on the active layer in direct contact with the back channel of the transistor. The threshold voltage modulation layer and the active layer have different work functions so that the threshold voltage modulation layer modulates the threshold voltage of devices and improve the performance of the transistor.
Ab Initio Chemical Kinetics for the Hydrolysis of N2O4 Isomers in the Gas Phase
(2012-05-10)
Zhu, R. S.
;
Lai, Ke-Yu
;
Lin, M. C.
;
應用化學系分子科學碩博班
;
Institute of Molecular science
The mechanism and kinetics for the gas-phase hydrolysis of N2O4 isomers have been investigated at the CCSD (T)/6-311++G(3df,2p)//B3LYP/6-311++G(3df,2p) level of theory in conjunction with statistical rate constant calculations. Calculated results show that the contribution from the commonly assumed redox reaction of sym-N2O4 to the homogeneous gas-phase hydrolysis of NO2 can be unequivocally ruled out due to the high barrier (37.6 kcal/mol) involved; instead, t-ONONO2 directly formed by the association of 2NO(2), was found to play the key role in the hydrolysis process. The kinetics for the hydrolysis reaction, 2NO(2) + H2O <-> HONO + HNO3 (A) can be quatitatively interpreted by the two step mechanism: 2NO(2) -> t-ONONO2, t-ONONO2 + H2O -> HONO + HNO3. The predicted total forward and reverse rate constants for reaction (A), k(tf) = 5.36 x 10(-50)T(3.95) exp(1825/T) cm(6) molecule(-2) s(-1) and k(tr) = 3.31 X 10(-19)T(2.478) exp(-3199/T) cm(3) molecule(-1) s(-1), respectively, in the temperature range 200-2500 K, are in good agreement with the available experimental data.
MANUFACTURING METHOD FOR ORGANIC OPTOELECTRONIC THIN FILM
(2012-05-10)
CHEN Fang-Chung
;
Chuang Ming-Kai
Disclosed is a manufacturing method for an organic optoelectronic thin film comprising the steps of providing a substrate and a first electrode; forming a semiconductor layer on the substrate, wherein the semiconductor layer includes polyethylene glycol (PEG); forming a conductive polymer layer on the first electrode; disposing the substrate and the semiconductor layer on the conductive polymer layer and adhering the semiconductor layer to the conductive polymer layer; and removing the substrate; and forming a second electrode on the semiconductor layer. A first adhesion between the semiconductor layer and the substrate is generated. A second adhesion between the semiconductor layer and the conductive polymer layer is generated. The second adhesion is greater than the first adhesion so that while the substrate is removed, the semiconductor layer and the conductive polymer layer are still adhered.
CAPACITOR DEVICE AND METHOD FOR FORMING THE SAME
(2012-05-10)
Chin Albert
The present invention related to a method for forming a capacitor device, comprising steps of: providing a substrate, forming a first metal layer on the substrate, forming a dielectric on the first metal layer, applying a laser-annealing to the dielectric, and forming a second metal layer on the dielectric.
TIME-REVERSAL-BASED IMPACT-LOCALIZATION AND HAPTIC-FEEDBACK METHOD FOR TOUCH PANELS
(2012-05-10)
BAI MINGSIAN R.
;
TSAI YAO KUN
The present invention provides a time-reversal-based impact-localization and haptic-feedback method for touch panels. Firstly, a plate model for an elastic plate and the impulse responses thereof are constructed according a plate theory. Next, a mathematical model is established according to the impulse responses and a time-reversal approach. When an impact force hits the elastic plate, the touched point on the elastic plate generates a touch signal, and the touch signal is received by at least a sensor at the corner of the elastic plate. The touch signal is converted into a time-reversal signal according to the mathematical model by a simulator. The time-reversal signal is reversed to the touched point for simulating reversal vibration waves of the time-reversal signal on the elastic plate, and locating the touched point.
SYSTEMS AND METHODS OF CONSTRUCTING A PATIENT SPECIFIC NEURAL ELECTRICAL STIMULATION MODEL
(2012-05-10)
Choi Charles Tak Ming
;
Lee Yi-Hsuan
A system and a method of constructing a personalized or patient specific neural stimulation model. The method includes measuring an electro-physiology signal of an individual and establishing a personalized or patient specific neural stimulation model that has a preset model parameter and generates a human physiology parameter according to the model parameters; and analyzing the human physiology parameters and regulating the model parameters according to a parameter-optimizing algorithm, such that the human physiology parameters outputted by the personalized or patient specific neural stimulation model matches the measured electro-physiology signal.
Bostrycin, a novel coupling agent for protein immobilization and prevention of biomaterial-centered infection produced by Nigrospora sp No. 407
(2012-05-10)
Yang, Wen-Jen
;
Yang, Chih-Sheng
;
Huang, Chen-Ji
;
Chen, Ko-Shao
;
Lin, Shuen-Fuh
Bostrycin, a red antibacterial agent with tetrahydroanthraquinone structure, has been isolated from Nigrospora sp. No. 407. This study investigated the potential antibacterial and multifunctional properties of matrixes through immobilization of bostrycin on their surface for immobilization of protein and prevention of bacterial growth. Bostrycin was immobilized on nonwoven polypropylene (PP) fabric by a technique using glutaraldehyde and polyethyleneimine for the activation of the surface. Glucose oxidase immobilized on bostrycin-treated nonwoven PP fabric showed high activity. The immobilization process improved thermal stability of the enzymes. During repeated assay for 30 cycles, the enzyme activity dropped to only 70% of the initial activity. Both bostrycin-treated nonwoven PP fabric sample and subsequently immobilized glucose oxidase sample on the surface also still exhibited a bacteriostatic effect. This is the first study to show that bostrycin is a promising coupling agent for surface modification on matrix and its potential applications in protein immobilization and biomaterial-centered infection. Crown Copyright (C) 2012 Published by Elsevier Inc. All rights reserved.
Effect of size and shape dispersion on the averaged magnetic response of ensembles of semiconductor quantum rings
(2012-05-11)
Thu, L. M.
;
Chiu, W. T.
;
Voskoboynikov, O.
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper a theoretical study was made of the conditional averages of the magnetization and magnetic susceptibility of dispersive ensembles of nano-objects with a very complex geometry-self-assembled wobbled semiconductor quantum rings. Using the multivariate statistics approach and previously proposed mapping method the impact of the dispersion of the ring geometry parameters on the static magnetic response of the ensembles has been investigated near the first Aharonov-Bohm oscillation. The description is suited to clarify the important question of which geometrical parameters' dispersions are crucial for the formation and properties of the magnetic response of ensembles. We theoretically show that for the dispersive ensembles of InGaAs/GaAs capped wobbled quantum rings the actual value and temperature dependence of the differential magnetic susceptibility can be optimized by an appropriate control of the conditional parameters of the ensembles. The ring rim radius variations play a crucial role in this dependence. We have managed to simulate in detail the temperature behavior of the meaningful averages of the magnetization and positive peak of the differential magnetic susceptibility for ensembles of the rings known from the experiment. The simulated temperature dependence, position, and magnitude of the positive peak in the differential magnetic susceptibility are in a good agreement with the experimental observations.
絕對延遲時間產生裝置
(2012-05-11)
李鎮宜
;
游瑞元
;
余建螢
;
陳俊廷
一種絕對延遲時間產生裝置，由一製程供壓溫度(process－voltage－temperature；PVT)偵測裝置與一延遲時間產生器所構成。PVT偵測裝置包含複數組延遲模組與訊號相位/頻率控制模組，且各該延遲模組復包含對照單元與參照單元，此對照單元與參照單元在延遲特性上對PVT有相異的敏感度。各該延遲模組係用以比對原始訊號分別通過對照單元與參照單元所產生的相位或頻率差異，進而產生各該延遲模組的延遲參數，而訊號相位/頻率控制模組係用以接收並比對各該延遲參數，以標定該絕對延遲時間產生裝置的外部環境PVT狀態，進而控制與校正此延遲時間產生器，產生一精準的絕對延遲時間。透過上述絕對延遲時間產生裝置，受到不同的PVT(process－voltage－temperature)影響下，分析各該延遲模組的延遲參數，以標定當前PVT條件對該絕對延遲時間產生裝置造成的延遲情況，產生精準的絕對延遲時間，可進而產生精準頻率。在PVT改變的情況下，依然能夠保持穩定的準確度。
具有二段喉部的濕壁型文氏洗滌器
(2012-05-11)
蔡春進
一種具有二段喉部的濕壁型文氏洗滌器，係包含有一文氏管、二導管以及一儲槽，文氏管具有一收縮段、一喉部以及一擴張段，喉部係連接於收縮段及擴張段之間，導管係以其頂端與文氏管收縮段之底端連接，儲槽則是連接於導管之底端；藉此，用以潤濕管壁之洗滌水可即時洗除附著於收縮段管壁之微粒，隨後不經由文氏管喉部而可直接經由導管流動至儲槽，故可避免微粒堆積於文氏收縮段而導致阻塞，並避免了文氏管壓損異常升高的現象。
產生倍頻光訊號之光電調變裝置及其調變方法
(2012-05-11)
陳智弘
;
林俊廷
;
施伯宗
;
彭朋群
;
戴盛鵬
本發明係揭露一種產生倍頻光訊號之光電調變裝置及其調變方法，其係利用一顆商業用整合型光電調變器、一射頻訊號產生器與一相位偏移器即可產生倍頻之輸出光源訊號。其方法為當射頻訊號產生器產生一第一調變訊號，而相位偏移器產生與第一調變訊號相位相差90度的第二調變訊號時，可對光電調變器進行適當偏壓，使光源訊號傳輸在最大值之後，再用上述兩調變訊號調變，就可產生倍頻之輸出光源訊號。
距離安樂死時間　零秒
(2012-05-13)
王俐文
;
Department of Communication and Technology
;
傳播與科技學系
狗兒端坐在畫面中，有的正對觀者，有的以側面示人，身形表情各異。每張照片底下有一行字，記錄拍攝當下的時間距離安樂死還有幾分幾秒。杜韻飛透過鏡頭，意圖以藝術形式喚起大眾對安樂死議題的注意力。
零秒出手　籃球小將陳翰圻
(2012-05-13)
戴子嘉
;
Department of Communication and Technology
;
傳播與科技學系
球賽進入最後讀秒階段，全場目不轉睛地看著球在籃框中轉了一圈，在「三、二、一」的倒數聲中，嗶……裁判鳴笛，球進了！