现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block ...现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block and Linear Strain Mode,RELSM)在描述板块内部局部微地形应变时表现不佳;为精细刻画板内应变,在已有的RELSM模型基础上,通过引入地形因素,并联合GNSS、InSAR数据,通过改进型粒子群算法反演板内局部区域应变场参数,为局部区域精细化的地壳活动性评估提供帮助.展开更多
High-temperature superconductors in superconductor apparatuses are subjected to mechanical strains under operating conditions.These strains cause the degradation of the critical current densities and influence AC loss...High-temperature superconductors in superconductor apparatuses are subjected to mechanical strains under operating conditions.These strains cause the degradation of the critical current densities and influence AC losses in the superconductors.Based on the dynamic process of thermomagnetic interaction,we report the results of numerical analysis of AC losses in an infinite high-temperature superconducting slab subjected to a uniform in-plane strain in an alternating external magnetic field parallel to the sample surface.The numerical analysis shows the details of electromagnetic phenomena in the slab and the dependences of AC loss on various external parameters including the uniform strain in the slab and the amplitude and frequency of the external magnetic field.In this paper,we find that whether the magnetic field fully penetrates the superconductor is the key factor that influences the features of AC loss.When the magnetic field cannot fully penetrate the superconductor,the loss rises with increasing strain or decreasing frequency.When the magnetic field can fully penetrate the superconductor,the feature is just opposite.We also analyze the effects of periodic strain on AC loss.It is interesting to find that when the periodic strain frequency equals the external magnetic field frequency,the AC loss reaches the maximum,regardless if the magnetic field fully penetrates the superconductor or not.展开更多
文摘现实中存在许多人为制造或自然形成的微地形,以其为单位的应变分布与其所在板块的整体应变分布具有差异,本研究选取地壳活动相对活跃的腾冲市和顺镇区域作为试验区,实验表明已有的整体旋转与线性应变模型(Rotation in the Entire Block and Linear Strain Mode,RELSM)在描述板块内部局部微地形应变时表现不佳;为精细刻画板内应变,在已有的RELSM模型基础上,通过引入地形因素,并联合GNSS、InSAR数据,通过改进型粒子群算法反演板内局部区域应变场参数,为局部区域精细化的地壳活动性评估提供帮助.
基金supported by the National Natural Science Foundation of China(Grant Nos.11032006,11121202 and 11202087)National Key Project of Magneto-Constrained Fusion Energy Development Program(Grant No.2013GB110002)
文摘High-temperature superconductors in superconductor apparatuses are subjected to mechanical strains under operating conditions.These strains cause the degradation of the critical current densities and influence AC losses in the superconductors.Based on the dynamic process of thermomagnetic interaction,we report the results of numerical analysis of AC losses in an infinite high-temperature superconducting slab subjected to a uniform in-plane strain in an alternating external magnetic field parallel to the sample surface.The numerical analysis shows the details of electromagnetic phenomena in the slab and the dependences of AC loss on various external parameters including the uniform strain in the slab and the amplitude and frequency of the external magnetic field.In this paper,we find that whether the magnetic field fully penetrates the superconductor is the key factor that influences the features of AC loss.When the magnetic field cannot fully penetrate the superconductor,the loss rises with increasing strain or decreasing frequency.When the magnetic field can fully penetrate the superconductor,the feature is just opposite.We also analyze the effects of periodic strain on AC loss.It is interesting to find that when the periodic strain frequency equals the external magnetic field frequency,the AC loss reaches the maximum,regardless if the magnetic field fully penetrates the superconductor or not.
