Observation and study on phase of very low frequency propagation over polar area

甚 低频横跨极区传播相位的观测与研究

The Power-supply Wiring in Living Room and Electromagnetic Radiation with Very Low Frequency

居室电源布线与 特 低频电磁辐射

Due to the fact the values of S_ φ( f ) are very low in this frequency range it is necessary to measure them by a test set with very low testing threshold .

由于在这 f段的S（f）值甚 小，故必须用测试低限 很 低的测试设备。

Spectrum shaping filter has low compensation rate and it has very low compensation in high frequency thus it can not improve the resolution of seismic prospecting apparently .

频谱整形滤波器的 高频提升速率 低， 高频补偿严重不足，它对分辨率的改善不会 起到明显的作用；

With very low loss at high frequency alumina ( 96 % 99 % ) beryllium oxide ( BeO ) and aluminium nitride ( AlN ) ceramics are excellent substrates for microwave and RF circuits .

氧化铝（96%，99%）、氧化铍和氮化铝陶瓷的 高频损耗 很 低，是优良的微波和RF电路用基板。

In high frequency loss in traditional antenna is very great ; in low frequency traditional antenna is too big for use . So there are many limits for traditional antenna in modern wireless communication system and we hope an new antenna imminently .

传统的天线由于在高频段时候的损耗 太高，而在 低频段的时候几何尺寸大等缺点，在现代无线通信系统中的应用受到了很多限制，所以人们迫切地希望能有新型天线的出现。

Test of XLPE / PE Cables Using a Very Low Frequency Method

用 超 低频方法进行XLPE/PE电缆试验

The sixteen out of twenty-two observational Very Low Frequency surveying lines along the fault demonstrate low value anomalies of horizontal e - lectric field and resistivity and the width of the anomaly extension is 60 ~ 120m .

沿该断裂实测22条 甚 低频测线，其中16条测线结果显示出水平电场及电阻率的低值异常，其异常范围宽度60～120m。

Using half-empiric method C-layer effect of very low frequency ( VLF ) propagation phase is analyzed and modeled moreover the function of VLF phase prediction is modified .

应用半经验方法对 甚 低频（VLF）传播相位的C层效应进行了分析和建模，改进了VLF传播相位预测函数。

Research on Servo Control Method for Tracking with Pulse Based on Very Low Frequency

基于 极 低频 输入下脉冲跟踪伺服控制方法研究

The active control of noise is a very effective method to minimize low frequency noise .

有源噪声控制是消除 低频噪声的一种 很有效的方法。

The main spectral components are distinguished in the heart rate variability spectrum : ultra low frequency ( ULF ) very low frequency ( VLF ) low frequency ( LF ) high frequency ( HF ) components .

心率变异性长时程功率谱主要成份分为超低频、 极 低频、低频、高频。

This paper deals with a digital speech communicator of very low frequency and low bit digital communication based on software ratio which uses the technique of QPSK and FEC coding .

本文论述了一种基于软件无线电的 甚 低频低码率语音数字岩层通信机，它采用了QPSK调制和FEC信道编码技术。

The very low frequency electromagnetic method ( VLF-EM ) has such advantages as portable instrument simple method economical and high efficiency .

甚 低频电磁法（VLF-EM），具有仪器轻便、方法简单、经济高效等优点。

Among female sex workers the intervention coverage rate is still very low the frequency and depth of promotion and intervention is not enough .

针对暗娼人群的干预覆盖率还是 很 低，宣传干预的 频度和深度还不够。

A very low frequency of transmittance to visceral tissue was confirmed in pigs but not in sheep .

确认了猪，但不是羊，会发生 非常 低 频率的（基因片段）内脏组织转移。

Existing predominantly in the Very Low Frequency part of the radio spectrum that corresponds with the audio frequency range we can experience this activity as audible sound .

尽管这种活动主要存在于无线电声音频率分区的 超 低频区域，我们还是能够通过听觉来捕捉到它。

The selection of the insulator applied for a large power very low frequency transmitting antenna were studied .

本文对大功率 甚 低频发射天线用绝缘子的选型进行了研究。

Feasibility and System Design of Very Low Frequency Electromagnetic Remote-Controlled Naval Mine

甚 低频遥控水雷的可行性分析与系统设计

The application of the very low frequency electromagnetic method to the exploration of a fluorite deposit

甚 低频电磁法在某萤石矿勘查中的应用

This paper analyses the electromagnetic radiation with very low frequency caused by the power-supply wiring of household appliances .

本文讨论了家用电器馈（电）线所产生的“ 特 低频电磁辐射”问题。

Using a method of the spatial frequency filtering by combining the directional filtering with the very low frequency filtering the desirable optical signals cau be taken out of a considerably complex image .

采用方向性滤波与 极 低频滤波相结合的方法，可以从较复杂的图象中提取所需用的信号。

Giant magnetostrictive actuator and its hysteresis analysis Study on the characteristics of electrical tree with bush structure and growing very slowly in low frequency

超磁致伸缩 电&机械转换器设计及其滞回特性分析交联 聚乙烯中的滞长型丛林状电树枝特性研究

A long range link established with the high power Very Low Frequency ( VLF ) system resists atmospheric nuclear effects and is very difficult to jam .

用高功率 甚 低频系统建成的一条远距离链路，可抵抗大气核爆炸效应，且敌人很难干扰。

Simulated by EDA software Cadence the results obtained are satisfied . The DC open-loop gain is 82.9 dB with a 28 kHz 3 dB bandwidth and its phase margin is 46.9 . The maximum output noise spectral density is 1.5 mV / Hz2 at very low frequency .

用EDA软件Cadence进行模拟，得到了满意的仿真结果：直流开环增益为82.9dB，f-3dB为28kHz，相位裕度为46.9， 低频下输出噪声频谱密度为 1.5mV/Hz2。

New results in medium voltage cable assessment using very low frequency with partial discharge and dissipation factor measurement

用 极 低频以局放和损耗因数测量来鉴定中压电缆的新成果

Very low frequency band radiated field system

甚 低频带辐射场系统

In vitro morphogenesis in A. rivieri occurred mainly through organogenesis while somatic embryogenesis took place under special culture conditions but with very low frequency . Most somatic embryos cannot convert to plants due high-frequency abnormality in these embryos .

魔芋形态建成以器官发生途径为主，在特定培养条件下也可形成体细胞胚，但 频率 极 低，且绝大部分体胚因高度畸形化而不能形成再生植株。

ACTC mutation may be of very low frequency both in Chinese patients with DCM and HCM .

ACTC基因在国人DCM和HCM患者中的突变 频率可能 很 低。

Emissions of light and very low frequency perturbations due to electromagnetic pulse sources

因电磁脉冲源引起的光辐射和 甚 低频微扰