据报道,中科院高能物理研究所(以下简称高能所)高场超导磁体团队研制的全国产超导二极实验磁体,在2021年6月13日结束的新一轮性能测试实验中取得突破性进展。该磁体在4.2 K (-269℃)温度下两个孔径内实现超过12 T磁场强度,达到超导线材...据报道,中科院高能物理研究所(以下简称高能所)高场超导磁体团队研制的全国产超导二极实验磁体,在2021年6月13日结束的新一轮性能测试实验中取得突破性进展。该磁体在4.2 K (-269℃)温度下两个孔径内实现超过12 T磁场强度,达到超导线材临界性能的85%以上,是目前国际上唯一一个采用不同超导材料组合线圈结构达到12 T磁场强度的二极实验磁体。据实验人员介绍,该磁体从结构设计,超导材料、电缆及磁体的制备。展开更多
The concept of using an externally applied magnetic field to add the drag force of a hypersonic reentry vehicle during the blackout was proposed by Bush in 1958.The increased drag force is caused by electromagnetic fo...The concept of using an externally applied magnetic field to add the drag force of a hypersonic reentry vehicle during the blackout was proposed by Bush in 1958.The increased drag force is caused by electromagnetic force that is introduced by interaction between the applied magnetic field and the weakly ionized airflow around the reentry vehicle.We investigated the influences of magnetic field intensities on the drag forces of a reentry vehicle by three dimensional(3-D)magnetohydrodynamics(MHD)simulation.The results showed that the drag fore exerted on the vehicle reached 25 kN when the magnetic field was 0.4 T.The drag force increased with the enhanced intial magnetic field.The bow shock was also pushed far away from the vehicle when the magnetic field was strengthened.展开更多
This paper is concerned with the decay estimate of high-order energy for a class of special time-dependent structural damped systems represented by Fourier multipliers. This model is widely used in the fields of semic...This paper is concerned with the decay estimate of high-order energy for a class of special time-dependent structural damped systems represented by Fourier multipliers. This model is widely used in the fields of semiconductivity, superconductivity, electromagnetic waves, electrolyte and electrode materials, etc.展开更多
文摘据报道,中科院高能物理研究所(以下简称高能所)高场超导磁体团队研制的全国产超导二极实验磁体,在2021年6月13日结束的新一轮性能测试实验中取得突破性进展。该磁体在4.2 K (-269℃)温度下两个孔径内实现超过12 T磁场强度,达到超导线材临界性能的85%以上,是目前国际上唯一一个采用不同超导材料组合线圈结构达到12 T磁场强度的二极实验磁体。据实验人员介绍,该磁体从结构设计,超导材料、电缆及磁体的制备。
基金supported by the National Natural Science Foundation of China (Grant Nos. 41204105,41104093,41174122)the Chinese Academy of Sciences (Grant No. KZZD-EW-01-3)
文摘The concept of using an externally applied magnetic field to add the drag force of a hypersonic reentry vehicle during the blackout was proposed by Bush in 1958.The increased drag force is caused by electromagnetic force that is introduced by interaction between the applied magnetic field and the weakly ionized airflow around the reentry vehicle.We investigated the influences of magnetic field intensities on the drag forces of a reentry vehicle by three dimensional(3-D)magnetohydrodynamics(MHD)simulation.The results showed that the drag fore exerted on the vehicle reached 25 kN when the magnetic field was 0.4 T.The drag force increased with the enhanced intial magnetic field.The bow shock was also pushed far away from the vehicle when the magnetic field was strengthened.
基金supported by the National Natural Science Foundation of China (No.10871175)
文摘This paper is concerned with the decay estimate of high-order energy for a class of special time-dependent structural damped systems represented by Fourier multipliers. This model is widely used in the fields of semiconductivity, superconductivity, electromagnetic waves, electrolyte and electrode materials, etc.
