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Nonlinear dynamical behavior of Xenon atoms along dislocation lines in UO_(2+x) nuclear fuel
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作者 SUI PengFei DAI ZhenHong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第5期82-87,共6页
Experimental results showed that there are a few Xenon atom bubbles connected by the dislocation line in the UO2+x nuclear fuel, and the largest radius of bubbles is about 45 nm. This phenomenon is in contrast to trad... Experimental results showed that there are a few Xenon atom bubbles connected by the dislocation line in the UO2+x nuclear fuel, and the largest radius of bubbles is about 45 nm. This phenomenon is in contrast to traditional bubble formation mechanism. This phenomenon is very important in understanding the properties of nuclear fuel. In this work, we apply a time- dependent microscopic atom transport equation and take into account stress coherent potential in the boundary of the dislocation. Using the equation, we numerically solved the stress coherence effect and studied the transfer properties of Xenon atoms along the dislocation line. Our numerical results show that the transport of the Xenon atoms along the dislocation changes nonlinearly with the external driving energy, and reaches at the saturation values. It explains the growth limit of Xenon atom bubbles that is in agreement with the experiment results. 展开更多
关键词 nonlinear atom transport dislocation line nuclear fuel
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Topological Properties of Spatial Coherence Function
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作者 任继荣 朱涛 段一士 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第2期367-370,共4页
The topological properties of the spatial coherence function are investigated rigorously. The phase singular structures (coherence vortices) of coherence function can be naturally deduced from the topological curren... The topological properties of the spatial coherence function are investigated rigorously. The phase singular structures (coherence vortices) of coherence function can be naturally deduced from the topological current, which is an abstract mathematical object studied previously. We find that coherence vortices are characterized by the Hopf index and Brouwer degree in topology. The coherence flux quantization and the linking of the closed coherence vortices are also studied from the topological properties of the spatial coherence function. 展开更多
关键词 WAVE dislocation lines PHASE SINGULARITIES BEAMS LIGHT KNOTS
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AN ANALYSIS OF 2D PIEZOELECTRIC HALFPLANE WITH A FIXED CONDUCTOR SURFACE
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作者 Li Guoqing Chen Chuanyao Hu Yuantai 《Acta Mechanica Solida Sinica》 SCIE EI 2002年第2期163-170,共8页
Solutions to a piezoelectric half-plane with a fixed conductorsurface electrode subjected to two generalized singularities (linedislocation and/or lien force and free charge) are presented.Coublomb forces acting on th... Solutions to a piezoelectric half-plane with a fixed conductorsurface electrode subjected to two generalized singularities (linedislocation and/or lien force and free charge) are presented.Coublomb forces acting on the singularities due to the boundarypolarization changes of medium and the induction charg- es ofconductor electrode are analyzed in detail. The interaction betweenthe two singularities is also analyzed numerically. Results show thatCoulomb forces will become important as the free change approachesthe boundary or two singularities move closely. 展开更多
关键词 Green's functions Coulomb forces line dislocation and line force
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