低频电磁,low frequency electromagnetic
1)low frequency electromagnetic低频电磁
1.This system is based onlow frequency electromagnetic technology.本文介绍一种新的低频电磁技术,能够从管道外壁快速探测管内壁缺陷,并已在实践中成功运用。
英文短句/例句
1.airborne proton magnetometer航空甚低频电磁系统
2.Study of Ultra-Low Frequency Electromagnetic Wave Exploration to Deep Geological Information深部地质信息的超低频电磁探测研究
3.APPLICATION OF ZOOM FFT TECHNIQUE TO DETECTING EM SIGNAL OF SLF/ELF频率细化技术在超低频/极低频电磁信号检测中的应用
4.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
5.APPLICATION OF CORRELATION DETECTION TO ELF SIGNAL DETECTION相关检测在甚低频电磁信号检测中的应用
6.Technique and Theory of Semi-continuous Casting of Aluminum Alloys under Low-frequency Electromagnetic Field;低频电磁半连续铸造铝合金工艺及理论研究
7.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
8.Low-frequency Electromagnetic Radiation Field Interaction with Cerebral Nervous MT低频电磁辐射与脑神经细胞微管的相互作用
9.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
10.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
11.Analysis of Low Frequency Electromagnetic Radiation Data Before Earthquake低频电磁辐射仪地震前的观测资料分析
12.Filtering of Ultra-Low Electromagnetic Detection Signal Using Independent Component Analysis基于独立成分分析的超低频电磁探测信号滤波
13.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
14.Study on Wideband Electromagnetic Characteristics of Stealth Targets in Low Frequency;隐身目标低频宽带电磁散射特性研究
15.Decrease electron-magnetic radiation by using spread-spectrum-clock generation technique采用扩展频谱时钟技术降低电磁辐射
16.Research on Low-frequency Sine Waveform Exciting Mode for Electromagnetic Flowmeter;电磁流量计低频正弦波励磁方法的研究
17.Research on Low-frequency Three-value Trapezoidal Waveform Exciting Mode for Electromagnetic Flowmeter;电磁流量计低频三值梯形波励磁方法的研究
18.The effect of EMI has been reduced through frequency jitter.通过频率抖动,降低了开关电源的电磁干扰影响。
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 electromagnetic wave低频电磁波
1.Based on electromagnetic field theory, this paper derived the theoretical formulae used for crosswell formation resistivity logging in cased hole, conducted numerical simulation withlow frequency electromagnetic wave, and analyzed the effects of casing on crosswell resistivity logging.以电磁场理论为基础 ,导出了过套管进行井间电磁测井问题的理论公式 ,并用低频电磁波进行了数值模拟 ,分析了套管对井间电磁测井的影响。
2.Magnetic field distribution oflow frequency electromagnetic wave in even medium is analyzed,which is related to the medium s dielectric coefficient and magnetic inductive capacity.分析了低频电磁波在均匀介质中的磁场分布,其分布与介质的介电常数、磁导率密切相关。
3.Low frequency electromagnetic wave method,visual recognition method and odometer method are presented to achieve the pipeline robot s localization.提出了低频电磁波、视觉、计程轮这3种管道机器人定位方法;分析了3种传感器定位精度、作用范围和工作速率的特点;在考虑3种定位方法精度条件下,给出了传感器的优先权系数计算方法与基于优先权系数的D-S证据融合信度函数;通过D-S证据融合规则得到融合证据,解决了多传感器定位中决策传感器的选择问题,以实现管道机器人准确、快速地定位。
5)VLF-EM甚低频电磁
mon Data Processing Programs ofVLF-EM Based on Object-oriented Design Principle;基于面向对象设计原理的甚低频电磁法常用数据处理程序
6)low-frequency electromagnetometer低频电磁仪
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。
