Browsing by Issue Date, starting with "2018-08-17"

Now showing 1 - 20 of 10123

Direct observation of the change in transient molecular structure of 9,9'-bianthryl using a 10 fs pulse UV laser
(2018-08-17)
Hashimoto, Sena
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Yabushita, Atsushi
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Kobayashi, Takayoshi
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Okamura, Kotaro
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Iwakura, Izumi
Photoexcitation of 9,9'-bianthryl has been considered to produce a locally excited (LE) state and then a charge transfer (CT) state by intramolecular charge transfer (ICT) in polar solvents. In contrast, the CT state is considered to be unstable in non-polar solvents and triggers a dipole flip-flop between the two anthracene rings. The central C-C bond between the two anthracene rings is considered to twist during relaxation in the LE state and CT state, and this was visualized in the present work using an ultrashort ultraviolet (UV) pulse. The C-C stretching frequency was recovered in a period of ca. 500 fs, which implies that the C-C bond undergoes repeated torsion back and forth in the electronic excited state. Investigation of samples in a polar solvent and a non-polar solvent indicated that ICT does not affect the torsion around the central C-C bond. (C) 2018 Elsevier B.V. All rights reserved.
Ultrafast dynamics of coherent optical phonon in a thin film of Bi3Se2Te
(2018-08-17)
Ko, Ying-Kuan
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Huang, Yan-Hao
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Le, Phuoc Huu
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Luo, Chih-Wei
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Gospodinov, Marin Mirtchev
We have performed ultrafast time-resolved spectroscopy of transient absorption for a thin film of Bi3Se2Te, in which recent study result implies the existence of topological surface state. The observed relaxation signal was attributed to the band filling and Auger recombination processes based on the pump power dependence of the signal. After the band filling, bulk-to-surface scattering is thought to proceed being mediated by phonon emission. The dynamics of the phonon was observed from the dumped oscillation appeared on the relaxation curve of the observed signal. The phase of the oscillation indicates that the phonon mode has the period of 519 +/- 3 fs in the electronic excited state. (C) 2018 Elsevier B.V. All rights reserved.
Graphene quantum dots decorated iron oxide and halloysite nanotubes for high performance supercapacitor
(2018-08-19)
Ganganboina, Akhilesh Babu
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Doong, Ruey-An
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環境工程研究所
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Institute of Environmental Engineering
Enhanced catalytic reduction of nitrophenols by sodium borohydride over highly recyclable Au@graphitic carbon nitride nanocomposites
(2018-08-19)
Binh Nguyen
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Doong, Ruey-An
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Huang, Chin-Pao
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環境工程研究所
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Institute of Environmental Engineering
Breath figure method for construction of high-aspect-ratio pores using diacetylene-labeled polystyrene
(2018-08-19)
Wang, Cheng-Heng
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Chang, Chung-Kai
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Li, Ming-Chia
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交大名義發表
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生物科技學系
Facile chemical approach to regio control synthesis of gold-BINOL hybrid nanostructures
(2018-08-19)
Reddy, Patlolla Shashank
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交大名義發表
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National Chiao Tung University
Facile manufacturing on energy-efficient devices with excellent flexibility and surface antireflection
(2018-08-19)
Ko, Fu-Hsiang
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材料科學與工程學系
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Department of Materials Science and Engineering
Unraveling the electron transport and masking properties of g-C3N4 in Ni/Fe nanoparticle for enhanced TCE dechlorination
(2018-08-19)
Sahu, Rama S.
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Doong, Ruey-An
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環境工程研究所
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Institute of Environmental Engineering
Infrared spectra of protonated and hydrogenated corannulene (C20H10) and sumanene (C21H12) in solid para-hydrogen
(2018-08-19)
Sundararajan, Pavithraa
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Tsuge, Masashi
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Lee, Yuan-Pern
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應用化學系
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Department of Applied Chemistry
Reactivity of graphene oxide and reduced graphene oxide toward Tetrabromobisphenol A, Bisphenol A, and phenol from water: Reaction mechanism and thermodynamic effects
(2018-08-19)
Catherine, Hepsiba
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Lin, Yi-Hsuan
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Shih, Yang-Hsin
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Doong, Ruey-An
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環境工程研究所
V2O5 nanosheets as nanozyme with peroxidase-like activity for rapid and sensitive detection of glutathione
(2018-08-19)
Ganganboina, Akhilesh Babu
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Doong, Ruey-An
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環境工程研究所
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Institute of Environmental Engineering
Immobilization of bimetallic zerovalent iron nanoparticles onto low dimensional supports for enhanced hydrodechlorination of trichloroethylene
(2018-08-19)
Saha, Rama Shanker
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Tsou, Feng-Ju
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Doong, Ruey-An
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環境工程研究所
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Institute of Environmental Engineering
Effects of analogue interferences on sensing performance of imprinted photonic crystal sensors
(2018-08-19)
Chang, Sue-Min
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Chung, Wen-ching
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環境工程研究所
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Institute of Environmental Engineering
Adsorption phenomena and related mechanisms of airborne nanoparticles on porous materials
(2018-08-19)
Li, Ziyi
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Liu, Yingshu
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Tsai, Chuen-Jinn
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Xing, Yi
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Lu, Pei
交大e-News第261期-交大友聲515期交大活動訊息、全球產經新聞來囉！(2018年8月-I)
(2018-08-20)
國立交通大學秘書室
;
Secretariat
Conductive tail-to-tail domain walls in epitaxial BiFeO3 films
(2018-08-20)
Jin, Yaming
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Xiao, Shuyu
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Yang, Jan-Chi
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Zhang, Junting
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Lu, Xiaomei
The complex conductive behavior of ferroelectric domain walls is attracting more and more attention for their potential application as an independent nanoelectronic component. For the (001) epitaxial BiFeO3 films, we find that the domain wall conductivity varies among 71 degrees domain walls, with tail-to-tail (T-T) domain walls more conductive than head-to-head (H-H) and head-to-tail (H-T) ones. Furthermore, it is observed that most of the conductive areas are composed of two parallel lines around the T-T domain walls. These experimental results can be well simulated by our theoretical model based on the polarization configuration and a tunneling mechanism. Our work will help to understand the mechanism of domain wall conductance in ferroelectric materials and further promote the usage of domain walls in advanced nano-devices. Published by AIP Publishing.
Chromatic confocal microscopy to rapidly reveal nanoscale surface/interface topography by position-sensitive detection
(2018-08-20)
Zhuo, Guan-Yu
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Hsu, Chia-Huan
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Wang, Yen-Hsiang
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Chan, Ming-Che
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光電系統研究所
This paper presents a confocal microscope for the rapid and noninvasive capture of threedimensional (3D) images showing the surface/interface topography in a far-field configuration. The proposed microscope features a nanoscale optical ruler capable of performing fast depth measurements based on the chromatic aberration of microscope objectives. A diffraction grating and a position-sensitive detector were used to extract the spectral shift, which directly maps the height of the surface with a nanoscale resolution. Because neither the mechanical scanning nor the spectrometer, which limit the speed of 3D imaging, are needed in the axial direction, full 3D surface topography images with nanoscale depth resolution can be acquired rapidly using the nanoscale optical ruler in conjunction with 2D lateral beam scanning. The presented technique overcomes the limitation of the detection speed of conventional chromatic confocal microscopy. In experiments, the 3D static and dynamic nanoscale surface profiles of several representative optoelectronic and electronic devices were demonstrated. This fast and non-invasive approach with nanoscale depth resolution to the measurement of topography images has considerable promise in academic research and industrial applications. Published by AIP Publishing.
Mitigation of performance degradation due to dynamic display contents in visible light communication using TV backlight and CMOS image sensor
(2018-08-20)
Chow, Chi-Wai
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Shiu, Ruei-Jie
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Liu, Yen-Chun
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Wang, Wei-Chung
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Liao, Xin-Lan
Here, we propose and demonstrate a performance degradation mitigation scheme in TV backlight and smart-phone-based visible light communication (VLC) system when the display content in the light-panel is dynamically changing. In order to evaluate the influence of the dynamic display contents to the VLC performance, we use a noise-ratio (NR) and noise-ratio standard deviation (NRSD) as the figure-of-merits for the bright-and-dark contrast of the display content; and the dispersal of the changing display content regarding the brightand-dark contrast respectively. Performances of 4 dynamic display contents with different combinations of NR and NRSD are analyzed. They are: low NR and low NRSD (NR 36.69%; NRSD = 0.0226); low NR and high NRSD (MR = 30.09%; NRSD = 0.2698); high NR and low NRSD (NR = 81.66%; NRSD = 0.0052); high NR and high NRSD (NR = 73.91%; and NRSD = 0.2717). The proposed scheme can work well; that is, even the transmission distance is up to 200 cm in both smart-phones. If the proposed scheme is not used, then high success rate can be observed only at the low NR and low NRSD display content when the transmission distance is < 100 cm. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Favorable clinical outcome of nonalcoholic liver cirrhosis patients with coronary artery disease: A population-based study
(2018-08-21)
Tsai, Ming-Chang
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Yang, Tzu-Wei
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Wang, Chi-Chih
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Wang, Yao-Tung
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Sung, Wen-Wei
AIM To elucidate the prevalence and risk of mortality of nonalcoholic liver cirrhosis (LC) patients with coronary artery disease (CAD). METHODS The study cohort included newly diagnosed nonalcoholic LC patients age >= 40 years old without a diagnosis of CAD from 2006 until 2011 from a longitudinal health insurance database. The mean follow-up period for the study cohort was 1152 +/- 633 d. The control cohort was matched by sex, age, residence, and index date. Hazard ratios (HRs) were calculated using the Cox proportional hazard model and the Kaplan-Meier method. RESULTS After exclusion, a total of 3409 newly diagnosed nonalcoholic cirrhotic patients were identified from one million samples from the health insurance database. We found that CAD (5.1% vs 17.4%) and hyperlipidemia (20.6% vs 24.1%) were less prevalent in nonalcoholic LC patients than in normal subjects (all P < 0.001), whereas other comorbidities exhibited an increased prevalence. Among the comorbidities, chronic kidney disease exhibited the highest risk for mortality (adjusted HR (AHR) = 1.76; 95%CI: 1.55-2.00, P < 0.001). Ascites or peritonitis exhibited the highest risk of mortality among nonalcoholic cirrhotic patients (AHR = 2.34; 95%CI: 2.06-2.65, P < 0.001). Finally, a total of 170 patients developed CAD after a diagnosis of nonalcoholic LC. The AHR of CAD in nonalcoholic LC patients was 0.56 (95%CI: 0.43-0.74, P < 0.001). The six-year survival rates for nonalcoholic LC patients with and without CAD were 52% and 50%, respectively (P = 0.012). CONCLUSION We conclude that CAD was less prevalent and associated with a reduced risk of mortality in nonalcoholic cirrhotic patients.
Type I superconductivity in Dirac materials
(2018-08-22)
Shapiro, B. Ya
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Shapiro, I.
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Li, Dingping
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Rosenstein, Baruch
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電子物理學系
Superconductivity of the second kind was observed in many 3D Weyl and Dirac semi-metals while in the PdTe2, superconductivity is clearly of the first kind. This is very rare in Dirac semi-metals, but is expected in clean conventional metallic superconductors with 3D parabolic dispersion relation. The conduction bands in this material exhibit the linear (Dirac) dispersion only along two directions, while in the third direction the dispersion is parabolic. Therefore the 'hybrid' Dirac-parabolic material is intermediate between the two extremes. A microscopic pairing theory is derived for arbitrary tilt parameter of the 2D cone and used to determine anisotropic coherence lengths, the penetration depths and applied to recent extensive experiments. Magnetic properties of these superconductors are then studied in the parallel to the layers magnetic field on the basis of microscopically derived Ginzburg-Landau effective theory for the order parameter.