Browsing by Issue Date, starting with "2016-02-15"

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Thermoelectric property and x-ray absorption near edge structure studies on Si-doped CaMnO3-delta
(2016-02-15)
Liu, Chia-Jyi
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Bhaskar, Ankam
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Yuan, J. J.
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Yang, Zong-Ren
;
Chen, Shih-Show
We report electrical resistivity, thermopower and Ca K-, Mn L-2,L-3- and O K-edges x-ray absorption near edge structure (XANES) studies on CaMn1-xSixO3-delta with x=0, 0.02, and 0.05. The transport properties measurements indicate that the sample of x=0.02 has the lowest electrical resistivity compared to the samples of x=0 and 0.05. Meanwhile, the temperature dependence of thermopower behaves significantly different for samples of x=0.02 and 0.05. These unusual phenomena are elucidated based on the charge transfer equilibrium principle together with the XANES results, which show that the Si substitution for Mn appears to generate an electron doping effect and lattice distortion. Among the samples, CaMn0.98Si0.02O3-delta exhibits the highest figure of merit of 0.0128 at 300 K. This value represents an improvement of about 52% compared to pristine CaMnO3-delta. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Photo-induced 1,3-cyclohexadiene ring opening reaction: Ab initio on-the-fly nonadiabatic molecular dynamics simulation
(2016-02-15)
Lei, Yibo
;
Wu, Huiyu
;
Zheng, Xiaolei
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Zhai, Gaohong
;
Zhu, Chaoyuan
By a newly developed algorithm to compute global nonadiabatic switching probability only using electronic adiabatic potential energy surfaces and its gradients, we could able to perform on-the-fly trajectory surface hopping molecular dynamics at the SA-CASSCF(14, 8)/6-31G* quantum level to investigate the photo-induced 1,3-cyclohexadiene ring opening reaction from 1,3-cyclohexadiene (CHD) to 1,3,5-hexatriene (HT). We found four conical intersection zones within three singlet low-lying electronic states, in which 1B/2A and 1A/2A are well known to be the most important conical intersection zones to govern dynamics of ring opening reaction. The present simulation gained insight into nonadiabatic dynamics in which 516 sampling trajectories out of 600 can switch back and forth between two involved potential energy surfaces not only at 1B/2A, but also at 1A/2A. This insight is the key to influence quantum yields and time scales of the ring opening reaction. We estimated time constants as 46 fs, 82 fs, and 120 fs, respectively for crossing 1B/2A and 1A/2A, and excited-state lifetime in comparison with corresponding experimental values 56 fs, 80 fs and 130 fs. We estimated quantum yield 0.47/0.53 to HT/CHD in comparison to experiment values 0.30/0.70 in the gas-phase and 0.41/0.59 in the condense-phase. Moreover, the present simulation within 600 sampling trajectories indicates that there is no five membered ring forming in agreement with experiment results and with prediction from the previous wave-packet simulation as a rare case. (C) 2015 Elsevier B.V. All rights reserved.
具有優選排列方向之奈米雙晶金膜、其製備方法、及包含其之接合結構
(2016-02-16)
陳智
;
邱韋嵐
;
周苡嘉
本發明係有關於一種具有優選排列方向之奈米雙晶金膜、其製備方法、及包含其之接合結構。該金膜具有一厚度方向，且於該厚度方向沿著[220]晶軸方向堆疊；其中，該金膜係至少50%以上之體積係由複數個奈米雙晶金所構成，該些奈米雙晶金係彼此相鄰且沿著垂直該厚度之方向排列，並沿著[111]晶軸方向堆疊而成。
天線裝置及天線系統
(2016-02-16)
金正元
一種天線裝置，包含一第一槽孔天線及第二槽孔天線。該第一槽孔天線通過一第一平面並接收一第一射頻訊號。該第二槽孔天線連接該第一槽孔天線，並通過一第二平面且接收一第二射頻訊號。該第二平面垂直於該第一平面。該第二射頻訊號的相位與該第一射頻訊號的相位相差九十度。藉此，天線裝置具有全向性水平極化的特性，且具有較小的水平截面積。
Ventricular Myocytes Electrically Couple with Nonmyocytes in the Infarcted Mouse Heart
(2016-02-16)
Rubart, Michael
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Tao, Wen
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Lu, Xiao-long
;
Lin, Shien-Fong
;
Soonpaa, Mark
Unique Localization of Phospholamban in Perinuclear Membranes of Cardiomyocytes from Several Species
(2016-02-16)
Chiou, Yu-An
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Sung, Yen-Ling
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Chen, Peng-Sheng
;
Lin, Shien-Fong
;
Chen, Zhenhui
生化反應之即時量測方法
(2016-02-16)
陳怡君
本發明係揭露一種生化反應之即時量測方法，其係在互相吸引的生物分子間利用福斯特共振能量轉移對(FRET pair)的施體螢光分子與受體螢光分子來分別進行標定，當生物分子間互相產生反應時，此標定的施體螢光分子與受體螢光分子會產生福斯特共振能量轉移(FRET)訊號。這些量測到的FRET訊號以及非FRET訊號之螢光強度係用來計算已結合FRET對、未結合施體螢光分子及未結合受體螢光分子等的濃度，然後自這些濃度的計算結果獲得化學反應速率。本發明可以應用於任何量測螢光的設備上，且不受限於樣本態樣，並可達到快速、即時且連續性的量測。
水畫模擬方法及電腦程式產品
(2016-02-16)
陳佩姍
;
黃　世強
;
林文杰
;
蔡文祥
一種水畫模擬方法，由一處理器執行，包含以下步驟：(A)計算第i粒子及第j粒子的距離D(i,j)。(B)判斷該第i粒子的區域碼及第j粒子的區域碼是否相同，若是，進入步驟(C)，若否，進入步驟(G)。(C)判斷該距離D(i,j)是否小於一第一作用距離，若是，(D)將該距離D(i,j)代入一第一位移計算公式，並根據計算結果更新該第i粒子的位置及第j粒子的位置。(E)判斷更新後的距離D(i,j)是否小於一第二作用距離，若是，(F)使該第i粒子的區域碼及第j粒子的區域碼相等。(G)將步驟(A)中該距離D(i,j)代入一第二位移計算公式，並根據計算結果更新該第i粒子的位置及第j粒子的位置。
獲得檢測裝置插拔組合及電力線拓樸的方法及其電子裝置
(2016-02-16)
張文信
;
陳勇旗
;
曹孝櫟
一種獲得檢測裝置插拔組合及電力線拓樸的方法及其電子裝置。所述方法包括下列步驟：取得至少一檢測裝置的第一數量以及至少一插座的第二數量；產生至少一檢測裝置以及至少一插座之間的多個插拔組合；依據第二數量計算總插座關係值；依據第一數量設定特定插拔組合的特定插拔次數以及特定插座關係值；以及依據特定插座關係值、總插座關係值以及各參考插拔組合與特定插拔組合之間的距離從多個參考插拔組合找出候選插拔組合。
多維資料空間的貝氏循序切割系統及其計數引擎
(2016-02-16)
李鎮宜
;
張錫嘉
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許書餘
;
陳志龍
;
蔡長宏
本發明係為一計數引擎，應用於D維度資料空間的一貝氏循序切割系統中。計數引擎包括：一過濾模組，比較至少一受測資料點及與一子分區所對應的D個邊界資訊產生D個旗標組；以及一計數模組，連接至該過濾模組，根據D個旗標組判斷該至少一受測資料點是否位於該子分區而產生一結果信號，並根據該結果信號而選擇性遞增與該子分區對應之一累計值。
USING DATA ENVELOPMENT ANALYSIS TO SUPPORT BEST-VALUE CONTRACTOR SELECTION
(2016-02-17)
Yang, Jyh-Bin
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Wang, Han-Hsiang
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Wang, Wei-Chih
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Ma, Shin-Min
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土木工程學系
Selecting an appropriate contractor or supplier is essential to the successful implementation of a public procurement project. The Taiwan government frequently applies the best-value (BV) tendering method, a multi-criteria evaluation method, to procure projects. However, the selection process of the winner for a BV-based procurement project is generally subjective and thus is easily accused of corruptions. To develop a systematic method to support contractor selection, this study proposes using the Data Envelopment Analysis (DEA) to facilitate the criteria evaluations for each bidder during the short-listing stage. The evaluation results of using the DEA are a list of potential BV winners who are then suggested to enter into the final selection stage. Based on three case studies related to service procurement projects, this research finds that the DEA is suitable of assessing the relative efficiencies among bidders when the BV approach is applied. Lessons learned here should be helpful in applying the DEA to aid bid evaluations in other supplier selection problems.
Development of Bifunctional Gadolinium-Labeled Superparamagnetic Nanoparticles (Gd-MnMEIO) for In Vivo MR Imaging of the Liver in an Animal Model
(2016-02-17)
Kuo, Yu-Ting
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Chen, Chiao-Yun
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Liu, Gin-Chung
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Wang, Yun-Ming
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生物科技學系
Liver tumors are common and imaging methods, particularly magnetic resonance imaging (MRI), play an important role in their non-invasive diagnosis. Previous studies have shown that detection of liver tumors can be improved by injection of two different MR contrast agents. Here, we developed a new contrast agent, Gd-manganese-doped magnetism-engineered iron oxide (Gd-MnMEIO), with enhancement effects on both T1-and T2-weighted MR images of the liver. A 3.0T clinical MR scanner equipped with transmit/receiver coil for mouse was used to obtain both T1-weighted spoiled gradient-echo and T2-weighted fast spin-echo axial images of the liver before and after intravenous contrast agent injection into Balb/c mice with and without tumors. After pre-contrast scanning, six mice per group were intravenously injected with 0.1 mmol/kg Gd-MnMEIO, or the control agents, i.e., Gd-DTPA or SPIO. The scanning time points for T1-weighted images were 0.5, 5, 10, 15, 20, 25, and 30 min after contrast administration. The post-enhanced T2-weighted images were then acquired immediately after T1-weighted acquisition. We found that T1-weighted images were positively enhanced by both Gd-DTPA and Gd-MnMEIO and negatively enhanced by SPIO. The enhancement by both Gd-DTPA and Gd-MnMEIO peaked at 0.5 min and gradually declined thereafter. Gd-MnMEIO (like Gd-DTPA) enhanced T1-weighted images and (like SPIO) T2-weighted images. Marked vascular enhancement was clearly visible on dynamic T1-weighted images with Gd-MnMEIO. In addition, the T2 signal was significantly decreased at 30 min after administration of Gd-MnMEIO. Whereas the effects of Gd-MnMEIO and SPIO on T2-weighted images were similar (p = 0.5824), those of Gd-MnMEIO and Gd-DTPA differed, with Gd-MnMEIO having a significant T2 contrast effect (p = 0.0086). Our study confirms the feasibility of synthesizing an MR contrast agent with both T1 and T2 shortening effects and using such an agent in vivo. This agent enables tumor detection and characterization in single liver MRI sections.
Mind-Wandering Tends to Occur under Low Perceptual Demands during Driving
(2016-02-17)
Lin, Chin-Teng
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Chuang, Chun-Hsiang
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Kerick, Scott
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Mullen, Tim
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Jung, Tzyy-Ping
Fluctuations in attention behind the wheel poses a significant risk for driver safety. During transient periods of inattention, drivers may shift their attention towards internally-directed thoughts or feelings at the expense of staying focused on the road. This study examined whether increasing task difficulty by manipulating involved sensory modalities as the driver detected the lane-departure in a simulated driving task would promote a shift of brain activity between different modes of processing, reflected by brain network dynamics on electroencephalographic sources. Results showed that depriving the driver of salient sensory information imposes a relatively more perceptually-demanding task, leading to a stronger activation in the task-positive network. When the vehicle motion feedback is available, the drivers may rely on vehicle motion to perceive the perturbations, which frees attentional capacity and tends to activate the default mode network. Such brain network dynamics could have major implications for understanding fluctuations in driver attention and designing advance driver assistance systems.
Stochastic growth dynamics and composite defects in quenched immiscible binary condensates
(2016-02-18)
Liu, I. -K.
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Pattinson, R. W.
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Billam, T. P.
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Gardiner, S. A.
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Cornish, S. L.
We study the sensitivity of coupled condensate formation dynamics on the history of initial stochastic domain formation in the context of instantaneously quenched elongated harmonically trapped immiscible two-component atomic Bose gases. The spontaneous generation of defects in the fastest condensing component, and subsequent coarse-graining dynamics, can lead to a deep oscillating microtrap into which the other component condenses, thereby establishing a long-lived composite defect in the form of a dark-bright solitary wave. We numerically map out diverse key aspects of these competing growth dynamics, focusing on the role of shot-to-shot fluctuations and global parameter changes (initial state choices, quench parameters, and condensate growth rates), with our findings also qualitatively confirmed by realistic finite-duration quenches. We conclude that phase-separated structures observable on experimental time scales are likely to be metastable states whose form is influenced by the stability and dynamics of the spontaneously emerging dark-bright solitary wave.
交大e-News第203期-交大前瞻火箭研究中心 APPL-9C雙節小火箭順利升空回收
(2016-02-19)
國立交通大學秘書室
;
Secretariat
Duality in topological superconductors and topological ferromagnetic insulators in a honeycomb lattice
(2016-02-19)
Huang, Shin-Ming
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Tsai, Wei-Feng
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Chung, Chung-Hou
;
Mou, Chung-Yu
;
電子物理學系
The ground state of the large Hubbard U limit of a honeycomb lattice near half filling is known to be a singlet d + id-wave superconductor. It is also known that this d + id superconductor exhibits a chiral p + ip pairing locally at the Dirac cone, characterized by a 2Z topological invariant. By constructing a dual transformation, we demonstrate that this 2Z topological superconductor is equivalent to a collection of two topological ferromagnetic insulators. As a result of the duality, the topology of the electronic structures for a d + id superconductor is controllable via the change of the chemical potential by tuning the gate voltage. In particular, instead of always being a chiral superconductor, we find that the d + id superconductor undergoes a topological phase transition from a chiral superconductor to a quasihelical superconductor as the gap amplitude or the chemical potential decreases. The quasihelical superconducting phase is found to be characterized by a topological invariant in the pseudospin charge sector with vanishing both the Chern number and the spin Chern number. We further elucidate the topological phase transition by analyzing the relationship between the topological invariant and the rotation symmetry. Due to the angular momentum carried by the gap function and spin-orbit interactions, we show that by placing d + id superconductors in proximity to ferromagnets, varieties of chiral superconducting phases characterized by higher Chern numbers can be accessed, providing a platform for hosting large numbers of Majorana modes at edges.
Inhibition of breast cancer with transdermal tamoxifen-encapsulated lipoplex
(2016-02-19)
Lin, Yu-Ling
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Chen, Chia-Hung
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Wu, Hsin-Yi
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Tsai, Nu-Man
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Jian, Ting-Yan
Background: Tamoxifen is currently used for the treatment of both early and advanced estrogen receptor (ER) positive breast cancer in pre- and post-menopausal women. However, using tamoxifen routinely to inhibit endogenous or exogenous estrogen effects is occasionally difficult because of its potential side effects. Objectives: The aim of this study is to design a local drug delivery system to encapsulate tamoxifen for observing their efficacy of skin penetration, drug accumulation and cancer therapy. Methods: A cationic liposome-PEG-PEI complex (LPPC) was used as a carrier for the encapsulation of tamoxifen and forming 'LPPC/TAM' for transdermal release. The cytotoxicity of LPPC/TAM was analyzed by MTT. The skin penetration, tumor growth inhibition and organ damages were measured in xenograft mice following transdermal treatment. Results: LPPC/TAM had an average size less than 270 nm and a zeta-potential of approximately 40 mV. LPPC/TAM displayed dramatically increased the cytotoxic activity in all breast cancer cells, especially in ER-positive breast cancer cells. In vivo, LPPC drug delivery helped the fluorescent dye penetrating across the skim and accumulating rapidly in tumor area. Administration of LPPC/TAM by transdermal route inhibited about 86 % of tumor growth in mice bearing BT474 tumors. This local treatment of LPPC/TAM did not injury skin and any organs. Conclusion: LPPC-delivery system provided a better skin penetration and drug accumulation and therapeutic efficacy. Therefore, LPPC/TAM drug delivery maybe a useful transdermal tool of drugs utilization for breast cancer therapy.
Atomic and electronic aspects of the coloration mechanism of gasochromic Pt/Mo-modified V2O5 smart films: an in situ X-ray spectroscopic study
(2016-02-21)
Lu, Ying-Rui
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Hsu, Hsin-Hua
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Chen, Jeng-Lung
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Chang, Han-Wei
;
Chen, Chi-Liang
In this work, gasochromic pristine and Mo-modified V2O5 thin films were prepared by the sol-gel spin coating method. Both films exhibit excellent gasochromic coloration. Synchrotron grazing incidence X-ray diffraction reveals that the Mo-modified V2O5 thin film is more amorphous than the pristine V2O5 thin film. X-ray absorption spectroscopy (XAS) was utilized to elucidate the modifications of the local electronic and atomic structures that are caused by Mo. In situ soft-XAS and in situ hard-XAS were performed to monitor the effect of the adsorption of dihydrogen on the charge state of vanadium and local atomic rearrangement in the gasochromic thin films. The gasochromic V2O5 film has a significantly pyramid-like oxygen-coordinated environment. However, the Mo-modified film exhibits mixed pyramid- and octahedral-like structures. Analytic results indicate that upon gasochromic coloration, adsorption of hydrogen adds electrons to the V 3d t(2g) orbital, lowering the charge state of vanadium. The films undergo structural modification before the valence is changed. The Mo-modified V2O5 film exhibits faster coloration because the apical V-O bond differs from that in the pristine V2O5 film. This in situ XAS allows real-time monitoring of changes in the element-specific local atomic structure during the gasochromic reaction and enables the elucidation of the gasochromic mechanism.
Theoretical and experimental studies for high-repetition-rate disordered crystal lasers with harmonic self-mode locking
(2016-02-22)
Sung, C. L.
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Lee, C. Y.
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Cho, H. H.
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Huang, Y. J.
;
Chen, Y. F.
A harmonically self-mode-locked Nd:Sr3Y2(BO3)(4) disordered crystal laser with subpicosecond pulse duration is demonstrated. We exploit the damped harmonic oscillator model to numerically verify that the mode spacing of the laser cavity can be modified to be the harmonics of the free spectral range of the Fabry-Perot cavity when the optical length of the laser cavity is close to a commensurate ratio of the optical length of the FabryPerot cavity. In experiment, the Fabry-Perot cavity can be formed by the pump facet of the disordered crystal and the front mirror. A 110 GHz single-pulse harmonically mode-locked pulse train with pulse duration of 857 fs is experimentally achieved under optical lengths of 27.19 and 4.08 mm for the laser cavity and Fabry-Perot cavity respectively, corresponding to a fractional number of 20/3. A maximum output power of 162 mW is obtained at an incident pump power of 3.1 W. (C)2016 Optical Society of America
Low-Temperature and Ultrafast Synthesis of Patternable Few-Layer Transition Metal Dichacogenides with Controllable Stacking Alignment by a Microwave-Assisted Selenization Process
(2016-02-23)
Chen, Yu-Ze
;
Medina, Henry
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Wang, Sheng-Wen
;
Su, Teng-Yu
;
Li, Jian-Guang
To date, the chemical vapor deposition (CVD) process is the most popular approach because of its high yield and quality. Nevertheless, the need for a high temperature and the relatively long process time within each cycle hinder the commercial development in terms of production cost. In this work, we demonstrate a fast (<3 min) and feasible approach to synthesizing a few-layers of WSe2 and MoSe2 on arbitrary substrates by a microwave-assisted selenization process. The transition metal dichalcogenides (TMDs) can be patterned by standard photolithography. Furthermore, controllable layered growth from horizontal to vertical alignment can be achieved, leading to an enhanced chemical catalytic activity caused by large edge sites (exposed areas). As a proof, a highly sensitive NO gas sensor based on vertical WSe2 was fabricated. Moreover, our microwave assisted selenization process can be further extended to achieve other two-dimensional TMD materials because of the simplicity of the process.