低频电场,low-frequency current field
1)low-frequency current field低频电场
1.Objective: To acquire three-dimensional reconstruction of right ventricular endocardium withlow-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。
2)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 inlow-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 thelow-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 thelow-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。
英文短句/例句
1.An Artificial ULF/ELF Electromagnetic Source Used in Geophysical Prospecting一种用于地球物理探测的人工超低频/极低频电磁场源
2.The Effect of Extremely Low Frequency Electromagnetic Fields on Neonatal Rat Osteoblasts;极低频电磁场对新生大鼠成骨细胞的影响
3.Experimental Study on Water Quality Stabilization Using the Low Frequency Electromagnetic Treatment of Reclaimed Water低频电磁场处理中水的水质稳定试验研究
4.Effect of extremely low frequency electromagnetic fields on Bax and Bcl-2 expression in spermatogenic cells of rats低频电磁场对大鼠生精细胞凋亡基因表达影响
5.Experimental Research on Static Scale and Corrosion Inhibition Using Low Frequency Electromagnetic Treatment of Reclaimed Water低频电磁场处理中水的静态阻垢缓蚀试验研究
6.Effects of ELF-EMF on immunological function in mice极低频电磁场对免疫低下小鼠免疫功能影响的实验研究
7.Objective To study the effect of extremely low frequency electromagnetic fields(ELF EMFs)on the anti-oxidation system and lipid peroxidation mechanism of rats.目的研究极低频电磁场对大鼠脑组织抗氧化系统的影响及其机制。
8.Study on Continuous Casting of Aluminum Alloys under Low-frequency Electromagnetic Field;低频电磁场作用下铝合金半连续铸造工艺与理论研究
9.Effects of Extremely Low Frequency Electromagnetic Fields on Differentiation of Mesencephalic Neural Progenitors and the Possible Mechanism;极低频电磁场对中脑神经前体细胞分化的作用及其机制研究
10.Cellular Studies of Extremely Low Frequency Electromagnetic Fields on Gene Mutations and Expression;极低频电磁场对细胞基因突变及基因表达的影响
11.A Study on the Effects of Extremely Low Frequency Electromagnetic Fields on the Male Reproduction and Its Mechanism in Mice;极低频电磁场对小鼠雄性生殖影响及其作用机理研究
12.Changes on Contents of Dopamine D2 Receptor in Prefrontal Cortex of Morphine Dependence Rats Managed by Extremely Low-frequency Electromagnectic Field after Morphine Abstinent;极低频电磁场处理吗啡依赖大鼠戒断后前额叶DA2受体含量变化
13.A Study of the Effect of Extremely Low Frequency Electromagnetic Fields on Spermatogenesis and Sperm Maturation in Mice and Its Mechanism;极低频电磁场对小鼠精子形成和成熟的影响及其机理的初步探讨
14.Study on the Biological Effects of Extremely Low Frenquency Electromagnetic Field on Hep G-2cells;极低频电磁场对Hep G-2细胞生物学效应的实验研究
15.Study about the Effects of ELF Electromagnetic Fields on Intracellular Free Ca~(2+) Concentration;极低频电磁场对胞内游离钙离子浓度影响的研究
16.Effect of Extremely Low Frequency Electromagnetic Fields on Rat C6 Glioma Cells极低频电磁场对大鼠C6胶质瘤细胞作用的实验研究
17.Study on stability of water quality for circulating cooling water in blast furnace by low frequency gradient magnetic低频高梯度电磁场处理高炉冷却水试验研究
18.Time-frequency analysis on influence of low resistive shielding layer in the exploration of transient electromagnetic field瞬变电磁场探测中低阻屏蔽层影响的时-频分析
相关短句/例句
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 inlow-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 thelow-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 thelow-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。
3)low frequency electromagnetic field低频电磁场
1.The influence oflow 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 oflow 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。
4)Low frequency current field低频电流场
5)extremely low frequency electric fields极低频电场
6)ULF electric field超低频电场
1.2 days ago, anomalies of Ti andULF electric field were recorded when DEMETER satellite of France flew above this epicentral area.9级地震,震前2天法国DEMETER卫星飞过震中上空时记录到离子温度(Ti)和超低频电场异常。
延伸阅读
磁层甚低频发射磁层中除由雷电辐射产生的哨声外，还存在一些天然的和受其他电磁波触发的甚低频电磁波。这些电磁波的频率范围与哨声相近，但出现的持续时间和频率－时间关系却多种多样，从持续时间只有几分之一秒的离散型到持续几十分钟以上的宽频带连续发射型，统称为甚低频发射。在离散型甚低频发射中，准周期型的电波(如合声)由从10赫到 5千赫的许多频率的上升调和下降调叠加而成，多发生在等离子层外的日照面赤道附近。触发离散型（如受哨声触发）发射，频率与哨声的频率范围相同，最常见的发生在哨声的上截止频率处(＝/2，为哨声传播路径顶点的电子回旋频率)。它有上升调也有下降调,形状很不规则,在等离子层顶附近出现最多，有时还有准周期型的触发发射。在高、中纬度地区，大功率电力网的高次谐波也在磁层触发甚低频发射，在沿等离子层顶内侧能观测到在这些高次谐波上叠加有上升调或下降调的离散型或准周期型的触发发射，它与合声不同之处是依附在工频的高次谐波上。受人工发射机信号触发的甚低频发射,依赖于发射信号的脉冲宽度、频率和功率，也依赖于电离层与磁层的条件。在适当的条件下,仅有100瓦的奥米加导航电信号也能触发甚低频发射。在宽频带连续型甚低频发射中，等离子层嘶声的频率为10赫～5千赫,在等离子层顶和等离子层内能观测到。极光区嘶声的频率从几千赫至 100千赫。它们和上述受触发的离散型有明显的准相干波列不同，嘶声表现为非相干的,类似于随机噪声的宽带特性,极光区嘶声发生在极光区上空2000公里附近，与极光的出现有很大的相关性。此外，还有一种在地面上接收不到、但在卫星上能接收到的高于电子回旋频率的右旋非常波模电磁波，因为频率高于哨声模电磁波，称为高通噪声。它是地球发出的、波长为千米数量级的无线电辐射，又称地球千米辐射。磁层是能谱宽广（从等离子层内部几个电子伏的低能粒子到辐射带中高达几百兆电子伏的高能粒子）的空间等离子体，在磁层中存在等离子体不稳定性，甚低频发射正是这些不稳定性所激发的电磁波。这是60年代以来的新发现（见磁层电磁波）。通过实验证实，在近赤道平面区由捕获的高能粒子与波产生的回旋共振不稳定性产生触发型甚低频发射；大功率电力网激发的甚低频发射，引起捕获粒子的投掷角散射，从而使高能粒子沉降；人工发射信号受波与粒子的相互作用后被放大达30分贝等现象，推动了理论的发展。
