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Search Results: 1 - 10 of 35163 matches for " Su Jiu-Qing "
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Orientation dependence of structural transition in fcc Al driven under uniaxial compression by atomistic simulations

Li Li,Shao Jian-Li,Duan Su-Qing,Liang Jiu-Qing,

中国物理 B , 2011,
Abstract: By molecular dynamics simulations employing an embedded atom method potential, we have investigated structural transformations in single crystal Al caused by uniaxial strain loading along the 001], 011] and 111] directions. We find that the structural transition is strongly dependent on the crystal orientations. The entire structure phase transition only occurs when loading along the 001] direction, and the increased amplitude of temperature for 001] loading is evidently lower than that for other orientations. The morphology evolutions of the structural transition for 011] and 111] loadings are analysed in detail. The results indicate that only 20% of atoms transit to the hcp phase for 011] and 111] loadings, and the appearance of the hcp phase is due to the partial dislocation moving forward on {111}fcc family. For 011] loading, the hcp phase grows to form laminar morphology in four planes, which belong to the {111}fcc family; while for 111] loading, the hcp phase grows into a laminar structure in three planes, which belong to the {111}fcc family except for the (111) plane. In addition, the phase transition is evaluated by using the radial distribution functions.
The resonance model and quantum area spectrum of Kerr-Newman black hole
Kerr-Newman黑洞的谐振子模型及量子面积谱

Li Chuan-An,Su Jiu-Qing,
李传安
,苏九清

物理学报 , 2006,
Abstract: 利用Kerr-Newman黑洞的质量M,电量Q,角动量J和它们各自的对偶量,πM,πQ,πJ,构成的六维相空间,通过规范变换,首先建立黑洞的简谐振子模型;再利用该模型进一步研究Kerr-Newman黑洞的量子面积谱.
The contribution of the high spinning gravitation field to the static black hole entropy with spherical-symmetry
高自旋场对静态球对称黑洞熵的贡献

Su Jiu-Qing,Li Chuan-An,
苏九清
,李传安

物理学报 , 2005,
Abstract: Using the improved brick-wall model,the writers of the article have made some r esearches in the contribution made by the high spinning gravitation field to sta tic ball-symmetry black hole entropy. The research shows that in the static bal l-symmetry black hole, the quanta entropy of the gravitation field in whitch th e spinning is 2 is still in direct proportion to the horizon. When the same trun catin genes as theose in scalar guantity field are selected the quanta entropy i s two times in scalar quantity field, and four-sevenths of those in Dirac field .
AN EFFECTIVE TWO-LEVEL CHANNEL FOR AN IMPURITY IN A SUPERLATTICE

Zhang Ai-zhen,Zhang Ping,Duan Su-qing,Zhao Xian-geng,Liang Jiu-qing,

中国物理 B , 2001,
Abstract: The eigenstates and eigenspectrum of a charged particle in a one-dimensional semiconductor superlattice with an impurity under the action of a dc electric field are investigated employing the single-band tight-binding model. We find that the system undergoes a series of avoided crossings, at which resonant oscillations between the impurity and its nearest neighbour occur if appropriate conditions are met, suggesting an effective two-level approximation. This phenomenon shows that introducing an impurity in a perfect lattice provides a promising structure for the observation of terahertz radiation.
Atomistic simulation of fccben bcc phase transition in single crystal Al under uniform compression

Li Li,Shao Jian-Li,Li Yan-Fang,Duan Su-Qing,Liang Jiu-Qing,

中国物理 B , 2012,
Abstract: By molecular dynamics simulations employing an embedded atom model potential, we investigate the fcc-to-bcc phase transition in single crystal Al, caused by uniform compression. Results show that the fcc structure is unstable when the pressure is over 250 GPa, in reasonable agreement with the calculated value through the density functional theory. The morphology evolution of the structural transition and the corresponding transition mechanism are analysed in detail. The bcc (011) planes are transited from the fcc (111) plane and the (111) plane. We suggest that the transition mechanism consists mainly of compression, shear, slid and rotation of the lattice. In addition, our radial distribution function analysis explicitly indicates the phase transition of Al from fcc phase to bcc structure.
The statistical entropy of Dirac field in spherically symmetric non-static black hole
球对称动态黑洞Dirac场的统计熵

Meng Qing-Miao,Su Jiu-Qing,Li Chuan-An,
孟庆苗
,苏九清,李传安

物理学报 , 2003,
Abstract: In terms of the improved brick-wall model, the statistical entropy of Dirac field in the most general spherically symmetric non-static black hole is calculated. It is shown that the entropy of the black hole is proportional to the area of event horizon at any time. It is noteworthy that the calculating formula for the dynamic proportional coefficient is obtained in this paper. Through calculating these dynamic proportional coefficients, the statistical entropies of the Dirac field in all kinds of the spherically symmetric non-static black hole can be obtained directly.
Statistical entropy of the Dirac field of static spherically symmetric black holes
静态球对称黑洞Dirac场的统计熵

Li Chuan-An,Meng Qing-Miao,Su Jiu-Qing,
李传安
,孟庆苗,苏九清

物理学报 , 2002,
Abstract: A statistical entropy of the Dirac field of static spherically symmetric black holes is gvien in this paper by using the improved brick wall model. The result shows that all these entrpies 7/2 times as large as the entropy of a scalar field when the same cutting factors are taken.
Massive particle quantum tunneling radiation of Barriola-Vilenkin black hole with global monopole
带有整体磁单极子的Barriola-Vilenkin黑洞时空中静质量不为零的粒子的量子隧穿辐射

Meng Qing-Miao,Su Jiu-Qing,Jiang Ji-Jian,
孟庆苗
,苏九清,蒋继建

物理学报 , 2007,
Abstract: The quantum tunneling framework is adopted to investigate tunneling radiation of Barriola-Vilenkin black hole with a global monopole. We obtain a conclusion that the emission rate of massive particles is related with the change of Bekenstein-Hawking entropy. The emission rates of massless and massive particles take the same functional form. It is consistent with the underlying unitary theory.
Instantaneous radiant emittance of the accelerating non-stationary black hole
加速运动动态黑洞的瞬时辐出度

Meng Qing-Miao,Su Jiu-Qing,Jiang Ji-Jian,
孟庆苗
,苏九清,蒋继建

物理学报 , 2007,
Abstract: Using entropy density near event horizon of the accelerating non-stationary black hole, the instantaneous radiant emittance is calculated, and we arrive at the conclusion that the instantaneous radiant emittance of black hole in a direction at any time is always proportional to the quartic power of temperature of the event horizon of black hole in that direction. It is found that the generalized Stefan-Boltzmann coefficient is no longer a constant, but a coefficient dynamically related to the rate of change of event horizon, the structure of space-time near event horizon and the radiation absorption coefficient of the black hole. It shows that an intrinsic relation between the gravitational field around the black hole and its thermal radiation must exist.
CROSSOVER FROM THERMAL HOPPING TO QUANTUM TUNNELING IN FERROMAGNETIC PARTICLE

Kou Su-peng,Liang Jiu-qing,Zhang Yun-bo,Wang Xiao-bing,Pu Fu-ke,

中国物理 B , 1999,
Abstract:
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