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Search Results: 1 - 10 of 108787 matches for " Wen-yu Ma "
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Polarization properties of partially coherent flat-topped light beams diffracted through a regular polygonal aperture
部分相干平顶光束经光阑衍射的偏振特性

Fu Wen-Yu,Ma Shu-Yi,
付文羽
,马书懿

物理学报 , 2008,
Abstract: Based on the beam coherence-polarization matrix and the propagation law, the polarization properties of partially coherent flat-topped light beams diffracted through a regular polygonal aperture are studied systematically. The expression for the degree of polarization of partially coherent flat-topped light beams is derived. And according to that, the expression for the degree of polarization of Gaussian Schell-model beams and the propagation of partially coherent flat-topped light beams in the free space are obtained. It is shown that the polarization properties of partially coherent flat-topped light beams diffracted through a rectangular aperture depends on the truncation parameter, spatial coherence parameters, diffraction angle, propagation distance and the order of flat-topped light beams.
Polarization properties of partially coherent flat-topped light beams diffracted through a regular polygonal aperture
部分相干平顶光束经光阑衍射的偏振特性

Fu Wen-Yu,Ma Shu-Yi,
付文羽
,马书懿

中国物理 B , 2008,
Abstract: Based on the beam coherence-polarization matrix and the propagation law, the polarization properties of partially coherent flat-topped light beams diffracted through a regular polygonal aperture are studied systematically. The expression for the degree of polarization of partially coherent flat-topped light beams is derived. And according to that, the expression for the degree of polarization of Gaussian Schell-model beams and the propagation of partially coherent flat-topped light beams in the free space are obtained. It is shown that the polarization properties of partially coherent flat-topped light beams diffracted through a rectangular aperture depends on the truncation parameter, spatial coherence parameters, diffraction angle, propagation distance and the order of flat-topped light beams.
Preparation and Thermoelectric Transport Properties of In-doping β-Zn4Sb3 Bulk Thermoelectric Materials
MA Bing, CHENG Su-Dan, ZHAO Wen-Yu, ZHANG Qing-Jie
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.00598
Abstract: A series of In-doped β-Zn4Sb3-based materials with nominal compositions of Zn4Sb3-xInx (0-0.08, ?x=0.02) by substituting Sb with In were designed in the paper. The single-phase In-doped β-Zn4Sb3-based bulk materials with no cracks were prepared by the combination of vacuum melting, furnace cooling and spark plasma sintering techniques. The electrical and thermal transport properties of Zn4Sb3-xInx in the temperature range of 300-700 K indicate that the In substitution for Sb in Zn4Sb3 compound brought the remarkable enhancement in carrier concentration and electrical conductivity, the almost complete vanishing of instinct excitation under high temperature, and the significant reduction in the lattice thermal conductivity. The lattice thermal conductivity for x=0.04 and 0.08 samples is very low and only about 0.21 W/(m·K) at 700 K. All In-doped β-Zn4Sb3-based bulk materials had higher ZT values as compared to undoped beta-Zn4Sb3 bulk material. A large ZT value of 1.13 has been achieved for Zn4Sb2.94In0.06 at 700 K that increased by 69%.
Multi-quark potential from AdS/QCD
Wen, Wen-Yu
High Energy Physics - Phenomenology , 2007, DOI: 10.1142/S0217751X08041475
Abstract: Heavy multi-quark potential in the SU(N) color group using hard-wall AdS/QCD at both zero and finite temperature is studied. A Cornell-like potential is obtained for baryons and other exotic configurations and compared with those in the quenched lattice calculation in N=3 case. At the end we also discuss possible improvements in the UV region of potential.
Inhomogeneous magnetic field in AdS/CFT superconductor
Wen-Yu Wen
Physics , 2008,
Abstract: We study the holographically dual description of superconductor in (2+1)-dimensions in the presence of inhomogeneous magnetic field and observe that there exists type I and type II superconductor. A new feature of type changing is observed for type I superconductor near critical temperature.
Universal ratio as lower bound
Wen-Yu Wen
Physics , 2008,
Abstract: We refine the definition of universal ratio c/\tilde{c} obtained via AdS/CFT correspondence as shown in arXiv:0801.2785 [hep-th], denoted as \gamma_c, and apply it to non-CFTs whose dual gravitational theory have metric of asymptotic AdS. We conjecture that \gamma_c=1 is the lower bound being saturated at high temperature regime and serves as an ordering parameter as energy scale varies. We test this conjecture with the hard wall AdS/QCD toy model and N=2* Pilch-Warner solution and find the agreement. At last, we make a connection with the C-Theorem and prove this conjecture in a general holographic background with multi-kink geometry.
Quantum Criticality in Einstein-Maxwell-Dilaton Gravity
Wen-Yu Wen
Physics , 2010, DOI: 10.1016/j.physletb.2011.12.053
Abstract: We investigate the quantum Lifshitz criticality in a general background of Einstein-Maxwell-Dilaton gravity. In particular, we demonstrate the existence of critical point with dynamic critical exponent z by tuning a nonminimal coupling to its critical value. We also study the effect of nonminimal coupling and exponent z to the Efimov states and holographic RG flow in the overcritical region. We have found that the nonminimal coupling increases the instability for a probe scalar to condensate and its back reaction is discussed. At last, we give a quantum mechanics treatment to a solvable system with z=2, and comment for generic z>2.
2-(Carboxymethyl)imidazo[1,2-a]pyridin-1-ium chloride
Wen-Yu Yin
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536812051549
Abstract: In the crystal structure of the title salt, C9H9N2O2+·Cl , the cations and anions are linked into chains parallel to [021] by O—H...Cl and N—H...Cl hydrogen bonds.
Influence of process parameters on the microstructural evolution of a rear axle tube during cross wedge rolling
Jia-wei Ma,Cui-ping Yang,Zhen-hua Zheng,Kang-sheng Zhang,Wen-yu Ma
- , 2016, DOI: https://doi.org/10.1007/s12613-016-1352-7
Abstract: In the shaping process of cross wedge rolling (CWR), metal undergoes a complex microstructural evolution, which affects the quality and mechanical properties of the product. Through secondary development of the DEFORM-3D software, we developed a rigid plastic finite element model for a CWR-processed rear axle tube, coupled with thermomechanical and microstructural aspects of workpieces. Using the developed model, we investigated the microstructural evolution of the CWR process. Also, the influence of numerous parameters, including the initial temperature of workpieces, the roll speed, the forming angle, and the spreading angle, on the grain size and the grain-size uniformity of the rolled workpieces was analyzed. The numerical simulation was verified through rolling and metallographic experiments. Good agreement was obtained between the calculated and experimental results, which demonstrated the reliability of the model constructed in this work.
Ductile fracture behavior of TA15 titanium alloy at elevated temperatures
Lei Yang,Bao-yu Wang,Jian-guo Lin,Hui-jun Zhao,Wen-yu Ma
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1171-2
Abstract: To better understand the fracture behavior of TA15 titanium alloy during hot forming, three groups of experiments were conducted to investigate the influence of deformation temperature, strain rate, initial microstructure, and stress triaxiality on the fracture behavior of TA15 titanium alloy. The microstructure and fracture surface of the alloy were observed by scanning electronic microscopy to analyze the potential fracture mechanisms under the experimental deformation conditions. The experimental results indicate that the fracture strain increases with increasing deformation temperature, decreasing strain rate, and decreasing stress triaxiality. Fracture is mainly caused by the nucleation, growth, and coalescence of microvoids because of the breakdown of compatibility requirements at the α/β interface. In the equiaxed microstructure, the fracture strain decreases with decreasing volume fraction of the primary α-phase (αp) and increasing α/β-interface length. In the bimodal microstructure, the fracture strain is mainly affected by α-lamella width.
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