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C.T. Hsieh,M.W. Lin,C.L. Chang,Y.C. Ho,S.Y. Chen,J. Wang,M.C. Chou,J.Y. Lin,C.H. Pai,P.H. Lin,L.C. Tai,S.H. Chen,G.Y. Tsaur,C.C. Kuo,T.Y. Chien 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
A general method for fabricating transient plasma structures with high-intensity laser pulses is developed to gain fine control over laser-plasma interactions. These structures have been used as programmable photonic devices in the development of laser-wakefield accelerators, soft X-ray lasers and plasma nonlinear optics driven by multi-terawatt laser pulses. Plasma ramps are used to control electron injection in laser-wakefield accelerators, plasma waveguides are used to enhance the efficiency of soft X-ray lasers by orders of magnitude and periodic plasma structures are used to achieve quasi-phase matching in relativistic harmonic generation. By scanning the interaction length with the same plasma-fabrication method, tomographic measurements are carried out to resolve the injection/acceleration process in laser-wakefield accelerators and amplification processes in X-ray lasers and relativistic harmonic generation. A theoretical analysis and a computer simulation are also carried out to provide insightful pictures of these processes. These research works show that by controlling plasma structures with optical fabrication methods, laser-plasma interaction can be engineered to expand and enrich the frontier of high-field physics.
Ionic Size Effect on the Spin Gap Nature of SrCu2(TeO3)2Cl2
C. N. Kuo,S. C. Chen,C. S. Lue 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
By means of magnetic susceptibility measurements, we report the effects of partial substitutionof Br onto the Cl sites of SrCu2(TeO3)2Cl2. This material has been a subject of current interestdue to indications of a spin gap behavior. However, the magnetic spin couplings responsiblefor the spin gap nature remain unclear. For each composition of SrCu2(TeO3)2(Cl1−xBrx)2, thetemperature-dependent susceptibility exhibits a character of low-dimensional magnetism with abroad maximum at Tmax. The magnitude of Tmax slightly shifts to higher temperatures with increasingBr concentration. The experimental data can be well fitted to a coupled spin dimer model,yielding an increasing trend for the spin gap size from 172 to 188 K. This indicates that the substitutionof Br ions has the effect of reducing the distance between Cu(1) and Cu(2) ions, leading toa stronger antiferromagnetic spin interaction. On the other hand, the variation of the interdimercoupling is marginal, indicative of substituting Br ions having little effect on the distance changesof Cu(1)-Cu(1) and Cu(2)-Cu(2) in SrCu2(TeO3)2Cl2.
Kuo, C.T.,Balamurugan, K.,Shiu, H.W.,Park, H.J.,Sinn, S.,Neumann, M.,Han, M.,Chang, Y.J.,Chen, C.H.,Kim, H.D.,Park, J.G.,Noh, T.W. Elsevier 2016 Current Applied Physics Vol.16 No.3
<P>We have studied the electronic structure and interfacial properties of mechanically exfoliated few-layer NiPS3 van der Waals crystals on ZnO/Nb:SrTiO3 substrates using scanning photoelectron microscopy and spectroscopy. The conducting ZnO layer enhances the visibility of few-layer NiPS3 on Nb:SrTiO3 and prevents charging effects in photoemission. We experimentally determined a type-II band alignment at the NiPS3/ZnO interface. The valence band offset (VBO) of few-layer NiPS3/ZnO is 2.8 +/- 0.09 eV, and the conduction band offset is 1.0 +/- 0.09 eV. Moreover, we found an increase of similar to 0.3 eV in VBO as decreasing NiPS3 thickness, suggesting electronic coupling or charge transfer at the NiPS3/ZnO interface. (C) 2016 Elsevier B.V. All rights reserved.</P>
Cold-flow patterns behind novel rifled bluff-body cones
Kuo C. San,Chih L. Shih,Shun C. Yen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
Flow momentum behind a conventional nozzle is modulated by four different bluff-body cones — non-rifled, 1-rifled, 2-rifled and 3-rifled cones. This novel rifled-cone swirl generator (RCSG) includes the blockage disc and rifled bluff-body cones. The rifled bluff-bodycone transforms the axial momentum (or the axial velocity) into the angular momentum (or the tangential velocity). The swirling flow isenhanced by increasing the tangential velocity of central jet. In this investigation, the carbon-dioxide (CO2) is utilized as the index gas todetermine the mixing index of RCSGs. Namely, the mixing index between the central CO2-jet and the annular air-jet is increased usingthe RCSGs. The cold-flow patterns behind the rifled bluff-body cones are visualized using the smoke-wire scheme. The cold-flow patternsare categorized as — jet-flow, single-bubble and dual-bubble modes. The jet-flow mode occurs at low ua. Additionally, the jet-flowand single-bubble modes are further classified as — Type-I and type-II sub-modes. The particle-image velocimetry (PIV) measures thecold-flow velocity vectors. The mixing levels of CO2 in the cold-flow modes are detected using a gas concentration analyzer.
Enhancing the H<sub>2</sub>O Megamaser Detection Rate Using Optical and Mid-infrared Photometry
Kuo, C. Y.,Constantin, A.,Braatz, J. A.,Chung, H. H.,Witherspoon, C. A.,Pesce, D.,Impellizzeri, C. M. V.,Gao, F.,Hao, Lei,Woo, J.-H.,Zaw, Ingyin American Astronomical Society 2018 The Astrophysical journal Vol.860 No.2
<P>Water megamasers from circumnuclear disks in galaxy centers provide the most accurate measurements of supermassive black hole masses and uniquely probe the subparsec accretion processes. At the same time, these systems offer independent crucial constraints of the Hubble constant in the nearby universe, and thus, the arguably best single constraint on the nature of dark energy. The chances of finding these golden standards are, however, abysmally low, at less than or similar to 3% overall for any level of water maser emission detected at 22 GHz and less than or similar to 1% for those exhibiting disk-like configuration. We provide here a thorough summary of the current state of detection of water megamaser disks along with a novel investigation of the likelihood of increasing their detection rates based on a multivariate parameter analysis of the optical and mid-infrared (mid-IR) photometric properties of the largest database of galaxies surveyed for 22 GHz emission. We find that galaxies with water megamaser emission tend to be associated with strong emission in all Wide-field Infrared Survey Explorer mid-IR wavelengths, with the strongest enhancement in the W4 band, at 22 mu m, as well as with previously proposed and newly found indicators of active galactic nucleus strength in the mid-IR, such as red W1 - W2 and W1 - W4 colors, and the integrated mid-IR luminosity of the host galaxy. These trends offer a potential boost of the megamaser detection rates to 6%-15%, or a factor of 2-8 relative to the current rates, depending on the chosen sample selection criteria, while fostering real chances for discovering. 20 new megamaser disks.</P>
Characteristic flow patterns and aerodynamic performance on a forward-swept wing
Kuo C. San,Yu F. Fei 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.10
This investigation elucidates the effects of Reynolds number (Re) and angle of attack (α) on the boundary-layer flow patterns, aerodynamic performance, flow behaviors and vortex shedding. This investigation applies a finite NACA 0012 forward-swept wing with the forward-sweep angle (φ) of 15°. The Reynolds numbers were tested in the range of 4.6 × 104 < Re < 105. The wing chord length is 6 cm and the semi-wing span is 30 cm, such that the full-span wing aspect ratio is 10. The surface oil-flow scheme was utilized to visualize the boundary-layer flow structures. The hot-wire anemometer was applied to measure the vortex-shedding frequency behind the forwardswept wing. Furthermore, a force-moment sensor was applied to measure the aerodynamic loadings. The surface oil-flow patterns are classified into six characteristic flow modes — separation, separation bubble, secondary separation, leading-edge bubble, bubble extension and bluff-body wake modes. Additionally, the output of force-moment sensor and the visualized boundary-layer flow configurations indicate that the aerodynamic performance is closely related to the boundary-layer flow behaviors. Furthermore, the boundary-layer flow stalled in the leading-edge bubble mode. Moreover, the vortex-shedding frequency behind the forward-swept wing shows that the vortexshedding frequency at low α exceeds that at high α.