1) Low frequency current field
低频电流场
2) low-frequency current field
低频电场
1.
Objective: To acquire three-dimensional reconstruction of right ventricular endocardium with low-frequency current field and to validate the accuracy of registration of the three-dimensional navigation and positioning system in vitro and in vivo respectively.
目的:基于低频电场方式对右心室进行三维重建,并对系统导航定位精度分别在体外和体内进行验证。
3) low frequency currents
低频电流
1.
Effects of low frequency currents on Rheum tanguticum Maxim seeds germination and activities
低频电流对唐古特大黄种子萌发及活力的影响
2.
By introducing orthogonal optimized experiment method,Tanggula rhubarb seeds were processed with low frequency currents combined with gibberellin,and their germination and activity are studied.
采用正交设计研究低频电流和赤霉素相结合对唐古特大黄种子萌发及活力的影响。
4) low-frequency electromagnetic field
低频电磁场
1.
Investigates experimentally and comparatively the as-cast microstructure and Cu macrosegregation of 2024 Al alloy ingots by HDC(horizontal direct chill) continuous casting process in low-frequency electromagnetic field and those by conventional horizontal continuous casting process,where the cross-sectional area of specimens is 40 mm×200 mm.
实验结果表明,低频电磁场可以显著地改善铸锭的微观组织,使铸锭的微观组织得到明显细化;低频电磁场还可以减少Cu元素在横截面上的宏观偏析,使Cu元素在横截面上的分布更加均匀。
2.
This paper provides a convergence analysis of finite element methods for the low-frequency electromagnetic fields in multi-media based on an A-φ scheme.
文中提出了求解多媒质中低频电磁场的一个全离散耦合A-φ方法。
3.
The results show that the low-frequency electromagnetic field effects on the formation of the CaCO3 grain by accelerating nucleation and suppressing crystal growth for scale inhibition.
文章利用电导率和钙离子浓度的变化研究了低频电磁场对碳酸钙结晶的影响,并分析了碳酸钙结晶体的微观结构。
5) low frequency electromagnetic field
低频电磁场
1.
The influence of low frequency electromagnetic field on ingot surface quality and as-cast microstructure in horizontal direct chill (HDC) casting process were investigated experimentally.
采用实验的方法研究了低频电磁场对水平半连续铸造铝合金的表面质量及铸态组织的影响·将使用传统水平半连续铸造生产出的铸锭与低频电磁水平半连续铸造生产的铸锭进行了比较·研究结果表明,低频电磁场可有效地减少铸锭的表面缺陷并显著改善铸锭的微观组织·此外,提高磁场的强度或适当降低磁场的频率均有利于对铸锭质量的改善·实验所采用的安匝数及频率范围中,最优的条件分别为10000,30Hz
2.
The distributions of electromagnetic fields with different intensities and frequencies in melt in electromagnetic HDC casting process were examined by numerical prediction, and the influences of low frequency electromagnetic field with different conditions on macrosegregation in HDC casting process were investigated experimentally.
研究结果表明:在传统水平半连续铸造工艺条件下,铸锭中易出现较严重的负偏析及重力偏析;然而,在低频电磁水平半连续铸造过程中,低频电磁场的存在明显削弱了铸锭中的宏观偏析。
6) extremely low frequency electric fields
极低频电场
补充资料：无电流场
若磁场的旋度为零，则这个磁场称为无电流场，又称势场。无电流场是无力因子 α为零的无力场的一种特殊情况。其磁场能量处于最低能态，磁力线无扭曲。目前日冕磁场的实测数据很少，几乎完全依赖于理论计算。虽然大于 2.5个太阳半径R⊙的日冕区，由于太阳风对磁场的扰动，不能认为是势场，但对于小于 2.5R⊙的内冕区及其中的活动区精细结构而言，至少可近似地看作势场。特别对小尺度日冕磁场结构，如冕流和极羽、日珥甚至冲浪，计算结果和观测资料都比较符合。这也说明，一般的日冕扰动是缓慢演化的，能持续几天或更长的时间，在短时间的电流出现并消失以后，立即又恢复到势场形态。甚至在耀斑发生并把日冕低层和色球高层的扭曲磁场的能量急速释放之后，日冕磁场又立即恢复到无电流状态。所以，只要活动区不是处于急剧上升或急剧下降阶段，势场模型还是适用的。
计算结果表明，只有在相当大的日冕电流影响下，日冕磁场才会与势场有较明显的偏离。因此，日冕势场形态和日冕密度结构的一致，并不排除在小于 2.5R⊙的日冕低层和色球区域内可以存在不大的电流。
计算结果表明，只有在相当大的日冕电流影响下，日冕磁场才会与势场有较明显的偏离。因此，日冕势场形态和日冕密度结构的一致，并不排除在小于 2.5R⊙的日冕低层和色球区域内可以存在不大的电流。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条