磁通蠕动模型,the model of flux creep
flux flow and creep model磁通流动与蠕动模型
1.Based on macro-electromagnetic constitutive relation of superconductivity: flux flow model andflux flow and creep model,numerical simulation of vibration of magnet levitated above a superconductor in superconductor-magnet levitation systems has been carried out.针对超导-永磁悬浮系统,分别采用描述超导宏观电磁场本构关系的磁通流动模型和磁通流动与蠕动模型,定量模拟了自由悬浮于超导体上方永磁体的振动。
3)flux creep磁通蠕动
parative studies on dynamic behavior of superconducting levitation system with consideration offlux creep;针对磁通蠕动效应的超导悬浮动力运动比较研究
2.Based on Anderson"sflux creep model, the counter direction hopping effect of the flux line is taken into consideration and a new general expression of irreversibility line (IL) is obtained.基于 Anderson磁通蠕动模型 ,考虑磁通的反跳对磁通蠕动速度的影响 ,得出了超导体中不可逆线的一般表达式。
3.Numerical calculation based onflux creep model with logarithmic barrier U showed that the dependence of ac losses Q on the amplitude of ac field Bac is still governed by Q∝Bmac, predicted by the Bean model.基于对数型位垒的巨磁通蠕动模型,我们进行的数值计算证明,交流损耗与交流振幅的关系在定性上是和临界态模型相同的,即与振幅的m次方成正比:Q∝(Bac)m。
4)reptation model蠕动模型
1.The fundamental ideas of polymerreptation model, as well as its success and failings with respect to predicting the rheological behavior of polymer melts and concentrated liquids, is provided in the paper.介绍了高分子蠕动模型的基本思想及在预测高分子熔体或浓溶液流变学行为时的成功与不足 ,综述了从不同角度出发对其进行修正及在预测非线性粘弹性行为的研究进展、初步分析了此模型的发展方
2.In addition to the type and character of physical crosslink network, the entanglement, topological factors,reptation model, lateral .介绍了物理交联网的类型与特性 ,综述了交联的缠结、拓扑因素、蠕动模型、横向扩散模型以及瞬变网模型。
5)local flux creep局域磁通蠕动
1.Using semiconductor Hall probes,we studied thelocal flux creep on a cylindrical melting\|textured grown YBa\-2Cu\-3O 7-δ sample at liquid nitrogen temperature and low applied field.利用半导体霍尔探头测量法在液氮温度下研究了低场下圆柱状熔融织构YBa2 Cu3O7-δ样品的局域磁通蠕动行为 。
6)electromagnetic creeping电磁蠕动
1.A prototype of the earthworm-like micro robot based onelectromagnetic creeping was designed according to the principle of the biomimtcs and manufactured using precision process technology to diagnose the colon micro-invasively or non-invasively actively,and in vitro experiments in intestine were made.为了对结肠进行微创无创检查,依据仿生学原理,使用微细加工技术,开发了一种基于电磁蠕动的仿蚯蚓微机器人结肠镜样机,进行了离体肠道试验。
延伸阅读
磁通流动（fluxflow）磁通流动（fluxflow）处在混合态的第二类超导体内若有传输电流，该电流也产生磁场，它与涡流点阵中的磁通线发生作用，使磁通线密度分布不均匀，产生驱动磁通线由密处向疏处移动的洛伦兹力，造成磁通线的流动称磁通流动。这种流动磁通线切割传导区就产生感应电动势或感生电场。这种在电势差上的电流，就意味着电能有损耗，以焦耳热形式释放出来，这类同于电流流经电阻的情况，称流阻或等效电阻Rf，它小于超导体在正常态时的正常电阻Rn。在温度接近0K时的流阻率ρf的经验公式为ρf=ρn(H/Hc2)这里ρn是正常态电阻率，Hc2是第二临界磁场。由此可见，ρf与磁场H密切相关。另一方面，像流体运动受到黏滞阻力那样，磁通流动速度也不能无限地增大，也受到磁通黏滞力Fv的阻碍，它与磁通流动速度v有关：Fv=-ηv这里η也称黏性系数。对理想的第二类超导体，由于不存在钉扎中心，所以在H超过Hc1后流阻明显，临界电流低，实用价值差。对硬超导体，洛伦兹力超过钉扎力后才有磁通流动发生。钉扎力越强，临界电流越高，实用价值也就越好。
