Browsing by Issue Date, starting with "2010-07-08"

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Interfacial Charge Carrier Dynamics in Core-Shell Au-CdS Nanocrystals
(2010-07-08)
Yang, Ting-Ting
;
Chen, Wei-Ta
;
Hsu, Yung-Jung
;
Wei, Kung-Hwa
;
Lin, Tai-Yuan
The interfacial charge carrier dynamics for core-shell Au-CdS nanocrystals with various shell thicknesses were investigated and presented. Due to the difference in band structures between Au and CdS, a pronounced photoinduced charge separation took place at the interface of Au and CdS, resulting in the electron-charged Au core and the hole-enriched CdS shell. The electron-charging of Au core in Au-CdS nanocrystals was revealed with the corresponding XPS analysis and photocurrent measurement. Time-resolved PL spectra were measured to quantitatively analyze the electron transfer event between CdS shell and Au core for Au-CdS nanocrystals. An increase in the electron-transfer rate constant was observed for Au-CdS nanocrystals with increasing shell thickness, probably due to the less pronounced electron hole interaction of thicker CdS, which enabled a fuller extent of participation of photoexcited electrons in the charge separation process. On the other hand, the hole-enriched CdS shell of Au-CdS nanocrystals upon light illumination was characterized with a photocatalytic process. The photocatalytic activity of Au-CdS nanocrystals was found to increase with increasing shell thickness, attributable to the greater capability of light absorption achieved by the extensive growth of the CdS shell. The correlation of photocatalytic activity with the shell thickness of Au-CdS nanocrystals corresponded well with that of the electron-transfer rate constant. As compared to the relevant commercial products like N-doped P-25 TiO(2), and CdS powders, the as-synthesized Au-CdS nanocrystals,exhibited superior photocatalytic performance under visible light illumination, demonstrating their potential as an effective visible-light-driven photocatalyst. Furthermore, the result of performance evaluation under natural sunlight shows that the present Au-CdS nanocrystals can be used as highly efficient photocatalysts which may practically harvest energy from sunlight.
Fast-Forwarding Hit to Lead: Aurora and Epidermal Growth Factor Receptor Kinase Inhibitor Lead Identification
(2010-07-08)
Coumar, Mohane Selvaraj
;
Chu, Chang-Ying
;
Lin, Cheng-Wei
;
Shiao, Hui-Yi
;
Ho, Yun-Lung
A focused library of furanopyrimidine (350 compounds) was rapidly synthesized in parallel reactors and in situ screened for Aurora and epidermal growth factor receptor (EGFR) kinase activity, leading to the identification of some interesting hits. On the basis of structural biology observations, the hit la was modified to better fit the back pocket, producing the potent Aurora inhibitor 3 with submicromolar antiproliferative activity in HCT-116 colon cancer cell line. On the basis of docking studies with EGFR hit Is, introduction of acrylamide Michael acceptor group led to 8, which inhibited both the wild and mutant EGFR kinase and also showed antiproliferative activity in HCC827 lung cancer cell line. Furthermore, the X-ray cocrystal study of 3 and 8 in complex with Aurora and EGFR, respectively, confirmed their hypothesized binding modes. Library construction, in situ screening, and structure-based drug design (SBDD) strategy described here could be applied for the lead identification of other kinases.
Dual-threshold-voltage two-port sub-threshold SRAM cell apparatus
(2010-07-08)
Chang, Mu-Tien
;
Huang, Po-Tsang
;
Hwang, Wei
The invention relates to a dual-threshold-voltage two-port sub-threshold SRAM cell apparatus. The above-mentioned apparatus comprises a first inverter, a second inverter, an access transistor and a read buffer. The first inverter and the second inverter include a plurality of first operating elements and a plurality of second operating elements for storing data. The access transistor is coupled to the first inverter and the second inverter, wherein the first operating elements and the second operating elements are high threshold voltage operating elements and the access transistor is low threshold voltage operating transistor. The read buffer is used for performing a read operation.
High temperature synthesis of Sn-3.5Ag-0.5Zn alloy nanoparticles by chemical reduction method
(2010-07-09)
Lin, C. Y.
;
Mohanty, U. S.
;
Chou, J. H.
;
應用化學系
;
Department of Applied Chemistry
The synthesis of Sn-3.5Ag-0 5Zn alloy nanoparticles was carried out respectively at 50 and 70 degrees C by using chemical reduction method to examine the temperature effect The stirring times were 3, 12 and 24 h for each temperature X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate the microstructures of the nanoparticle alloys. Xray diffraction patterns revealed that the compound of Ag(3)Sn was formed in the alloying process. Other intermetallic compounds such as Ag(4)Sn and Ag(5)Zn(8) were also obtained in the XRD patterns. Results on TEM revealed that the isolated particles were spherical in shape and the particle size varied from 10 to 20 nm, showing the crystalline nature of the alloy. The nanoparticles obtained were evenly dispersed and less aggregated for the stirring time of 12 h and temperature of 50 degrees C. On the other hand, the nanoparticles obtained at 70 degrees C under the stirring time of 3 h were amorphous in nature and agglomerated which are reflected in the TEM micrographs (C) 2010 Elsevier B.V All rights reserved
Robust observer-controller compensator design using the loop shaping design procedure and the algebraic method
(2010-07-10)
Lee, An-Chen
;
Pan, Yi-Ren
;
Huang, Yuan-Yong
;
機械工程學系
;
Department of Mechanical Engineering
This paper investigates robust observer-controller compensator design using Vidyasagar's structure (VS). VS has a unit matrix parameter H similar to the Q parameter for the Youla-Kucera parameterization. VS can be designed based on the left coprimeness of the central controller in the H(infinity)-loop shaping design procedure (H(infinity)-LSDP) and therefore can preserve the intrinsic properties of the H(infinity)-LSDP. This paper introduces algebraic methods to simplify the design of H in the VS controller by solving specific algebraic equations. In particular, the algebraic design of H can achieve two things. First, a dynamic H adjusts the tracking performance and yields the integral action. Second, a dynamic H rejects the input and output sinusoidal disturbances with known frequencies. These attributes are indications of the flexibility of the proposed method since the output-feedback controller design of the H(infinity)-LSDP cannot easily deal with such conditions. This paper discusses the achieved loop and the closed-loop behavior of the system with VS, and also gives two numerical examples. The first example shows that the proposed method results in a better design in many aspects than the resulting from H(infinity)-LSDP. The second example shows the application of the proposed method to rejecting input and output step disturbances, and input and output multiple sinusoidal disturbances, for which the H(infinity)-LSDP can hardly be used. Copyright (C) 2009 John Wiley & Sons, Ltd.
Demonstration of edge roughness effect on the magnetization reversal of spin valve submicron wires
(2010-07-12)
Chiang, T. W.
;
Chang, L. J.
;
Yu, C.
;
Huang, S. Y.
;
Chen, D. C.
We prepared submicron wide trilayer spin valve wires designed with periodic "spikes" as artificial roughness. The height and the pitch of the spikes were varied systematically. No obvious dependence was found between the roughness and the domain wall velocity when the spikes were smaller than a threshold of 30 nm for NiFe. The average velocity was slowed down when the height of the spikes were larger than the threshold. In-plane transverse magnetic fields help to reduce the critical current density for current induced domain-wall motion. Our results could be attributed to the space modulation of the local magnetization. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3463459]
Method for making very low Vt metal-gate/high-κ CMOSFETs using self-aligned low temperature shallow junctions
(2010-07-13)
Chin
;
Albert
This invention proposes a method for making very low threshold voltage (Vt) metal-gate/high-κ CMOSFETs using novel self-aligned low-temperature ultra shallow junctions with gate-first process compatible with VLSI. At 1.2 nm equivalent-oxide thickness (EOT), good effective work-function of 5.3 and 4.1 eV, low Vt of +0.05 and 0.03 V, high mobility of 90 and 243 cm2/Vs, and small 85° C. bias-temperature-instability <32 mV (10 MV/cm, 1 hr) are measured for p- and n-MOS.
Triplet quantum chain process in the photoisomerization of 9-cis retinal as revealed by nanosecond time-resolved infrared spectroscopy
(2010-07-15)
Yuzawa, Tetsuro
;
Hamaguchi, Hiro-o
;
應用化學系
;
應用化學系分子科學碩博班
;
Department of Applied Chemistry
The mechanism of the photoisomerization of 9-cis retinal has been studied by nanosecond time-resolved infrared spectroscopy. A cyclohexane solution of 9-cis retinal was photoexcited at 349 nm and the subsequent photodynamics were traced. A singular value decomposition (SVD) analysis of the time-resolved infrared data shows that there are two distinct isomerization pathways. One is the triplet pathway that takes place in the picosecond time regime from 9-cis to all-trans. The other involves the energy transfer between the all-trans triplet state and the 9-cis ground state with the resultant 9-cis triplet state subsequently reproducing the all-trans by fast isomerization on the triplet potential surface. This quantum chain process occurs in the microsecond time regime. (C) 2010 Elsevier B.V. All rights reserved.
Virtual channel platform
(2010-07-15)
Fan, Shih-Kang
;
Chen, Wen-Jung
A virtual channel platform is disclosed. Said virtual channel platform comprises two electrode plates, which can provide an electric field, and two spacers set between said plates. Said plates are separated by said spacers for forming a passageway. A driven fluid is injected into said passageway. When applying electric signals of different frequencies in said plates, said plates form said electric field to drive said working fluid in a virtual channel.
Theory of probing attosecond electron wave packets via two-path interference of angle-resolved photoelectrons
(2010-07-15)
Choi, N. N.
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Jiang, T. F.
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Morishita, T.
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Lee, M. -H.
;
Lin, C. D.
We study theoretically the electron wave packet generated by an attosecond pulse train (APT) which is probed with a time-delayed infrared (IR) laser pulse. The APT creates an excited state and a continuum electron wave packet. By ionizing the excited state with an IR, a delayed new continuum electron wave packet is created. The interference of the wave packets from the two paths, as reflected in angle-resolved photoelectron spectra, is analyzed analytically. Using the analytical expressions, we examine the possibility of retrieving information on the electron wave packet generated by the APT.
Tuning Spectral and Electrochemical Properties of Porphyrin-Sensitized Solar Cells
(2010-07-15)
Lo, Chen-Fu
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Hsu, Shun-Ju
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Wang, Chin-Li
;
Cheng, Yi-Hui
;
Lu, Hsueh-Pei
Phenylethynyl-substituted porphyrin (PEI) sensitizers bearing a nitro, cyano, methoxy, or dimethylamino phenylethynyl substituent were prepared to examine the electron-donating or -withdrawing effects of dyes on the photovoltaic performance of the corresponding dye-sensitized solar cells. The overall efficiencies of power conversion of the devices show a systematic trend Me(2)N-PE1 > MeO-PE1 > CN-PE1 > NO(2)-PE1, for which Me(2)N-PE1 has a device performance about 90% of that of a N719-sensitized solar cell under the same experimental conditions. The superior performance of Me(2)N-PE1 is attributed to the effective electron-donating property of the dye that exhibits broadened and red-shifted spectral features. According to frontier orbitals based on DFT calculations, the electrons are effectively injected from the dye to TiO(2) for Me(2)N-PE1 and MeO-PE1 upon excitation, but that driving force reverses for NO(2)-PE1. Electrochemical tests indicate that both LUMO and HOMO levels show a systematic trend Me(2)N-PE1 > MeO-PE1 > CN-PE1 > NO(2)-PE1, consistent with the trend of variation of the short-circuit currents in this series of sensitizers.
靜態隨機存取記憶體裝置
(2010-07-16)
張牧天
;
黃柏蒼
;
黃威
本發明揭露一種靜態隨機存取記憶體單元裝置,其包括第一反向器、第二反向器、存取電晶體以及讀取緩衝器。第一反向器與第二反向器分別包括多個第一操作元件與多個第二操作元件,以儲存資料。存取電晶體分別耦接第一反向器與第二反向器,其中第一操作元件與第二操作元件為高門檻電壓操作元件,存取電晶體為低門檻電壓電晶體。讀取緩衝器則用以執行讀取操作。
Liquid crystal alignment in nanoporous anodic aluminum oxide layer for LCD panel applications
(2010-07-16)
Hong, Chitsung
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Tang, Tsung-Ta
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Hung, Chi-Yu
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Pan, Ru-Pin
;
Fang, Weileun
This paper reports the implementation and integration of a self-assembled nanoporous anodic aluminum oxide (np-AAO) film and liquid crystal (LC) on an ITO-glass substrate for liquid crystal display (LCD) panel applications. An np-AAO layer with a nanopore array acts as the vertical alignment layer to easily and uniformly align the LC molecules. Moreover, the np-AAO nanoalignment layer provides outstanding material properties, such as being inorganic with good transmittance, and colorless on ITO-glass substrates. In this application, an LCD panel, with the LC on the np-AAO nanoalignment layer, is successfully implemented on an ITO-glass substrate, and its performance is demonstrated. The measurements show that the LCD panel, consisting of an ITO-glass substrate and an np-AAO layer, has a transmittance of 60-80%. In addition, the LCD panel switches from a black state to a bright state at 3 V(rms), with a response time of 62.5 ms. In summary, this paper demonstrates the alignment of LC on an np-AAO layer for LCD applications.
虛擬流道平台
(2010-07-16)
范士岡
;
陳玟蓉
一種虛擬流道平台，該虛擬流道平台包含有：二電極平板以及至少二設置於該二電極平板之間的分隔件，其中該二電極平板之間能形成電場，而該二分隔件使得該二電極平板之間形成有一平面通道，且該平面通道內注入有一主要驅動流體，而當施加不同頻率電壓於該二電極平板時，該二電極平板之間產生出電場，而電場的變化進一步驅動該主要驅動流體於該平面通道中移動。
太陽能電源管理裝置及其管理方法
(2010-07-16)
蔡同豪
;
謝維致
;
黃威
本發明係揭露一種太陽能電源管理裝置及其管理方法,太陽能電源管理裝置包含一連接充電電池與光電轉換器之太陽能控制單元,以及一電壓產生電路,此電壓產生電路連接太陽能控制單元與充電電池,太陽能控制單元根據其分別和電壓產生電路與光電轉換器之連接處的電壓大小,以決定由光電轉換器或充電電池提供該電壓產生電路所需要的輸入電壓,且控制充電電池之充放電狀態,電壓產生電路則將輸入電壓調節為至少一種電壓訊號供外部負載使用。本發明係藉由太陽能控制單元的控制機制,以增長於夜晚的使用時間。
交大e-News第075期
(2010-07-20)
Secretariat
;
國立交通大學秘書室
Green-emitting phosphors and process for producing the same
(2010-07-20)
Chen
;
Teng-Ming
;
Chiu
;
Yi-Chen
This invention relates to a green phosphor and a process for producing the same, wherein the phosphor is represented by a chemical formula: M(Tb1-xLax)4Si3O13, where M includes at least one of Ca and Sr, and 0
混合式識別碼的整合方法
(2010-07-21)
王瑞堂
;
張乃心
;
曾建超
;
劉合翰
本發明是關於一種混合式識別碼的整合方法。透過制訂一種固定格式的識別碼，該識別碼由混合式識別碼分配法則所產生，其使用兩種以上的子識別碼分配法則並加以整合。網路中的實體節點依照該混合式識別碼分配法則設定相鄰節點之識別碼，該動作會持續直到該網路內的每一個節點都含有一組識別碼或可使用之識別碼分發完畢。當網路內要從一個節點繞送封包到另一個節點時，該節點使用混合式繞送機制比對本身和目的端節點的識別碼，並藉由比對結果來決定使用某子識別碼分配法則相對的繞送機制對封包進行繞送。此外，該識別碼將會針對不同的實體分佈或需求整合各分配法則的特性。因此，可以讓不同實體分佈之網路環境，都具有合適的識別碼分配法則，達到識別碼的個別化及識別碼的最佳使用率。
平板式濕式分離器、包含此平板式濕式分離器之用於連續式採樣及分析之系統及用於將氣體吸收及氧化之設備
(2010-07-21)
蔡春進
;
林冠宇
本發明為一種高效率的平板式濕式分離器，它的氣體吸收表面主要由兩片親水性多孔性玻璃平板所組成，其表面塗敷TiO2微粒並照射UV光可進一步產生一個超親水性的表面，有利於平板表面之均勻水膜的形成及氣體吸收效率的提升。本發明可用於人工的酸鹼氣體採樣裝置，酸鹼氣體吸收控制設備，氣體-微粒分離採樣設備，並可結合離子層析儀作成半自動酸鹼氣體-微粒的分離採樣儀器。
Investigation of Conformation-Dependent Properties of L-Phenylalanine in Neutral and Radical Cations by Using a Density Functional Taking into Account Noncovalent Interactions
(2010-07-22)
Baek, K. Y.
;
Hayashi, M.
;
Fujimura, Y.
;
Lin, S. H.
;
Kim, S. K.
Conformation-dependent properties of L-phenylalanine in neutral and radical cations have been studied by using density functional theory (DFT) with a new density functional M05-2X, which is applicable to molecular systems with nonconvalent interactions. Adiabatic and vertical ionization energies and charge distributions in the cationic conformers in addition to optimized geometrical structures for both the neutral and the cationic conformers were evaluated. These results were compared with DFT (B3LYP) results. The M05-2X results can explain the correspondence between the observed and predicted conformers without ambiguity. The possibility of conformerization of neutral conformers is indicated from the results of IRC (intrinsic reaction coordinate) profiles.