低频

The cavity depth of the structure changed gradually from 70mm to 140mm. The structure has wide frequency range and low frequency absorbing characteristic, can be useful to absorb the diffracting sound over the top structure.

这种结构空腔深度为70mm~140mm，空腔截面逐渐变化，具有吸收低频及宽频带噪声的特点，可以更好吸收顶部绕射声。

Hz to enable the unit to be used in encloses to improve the low frequency performance.

40赫兹，使该单位将在包围用来改善低频性能。

Studying the method of culturing the osteoblast cell in vitro: By digestion with enzyme and tissue explanting, cranial bone of neonatal SD rat was

极低频矩形波电磁场对成骨细胞增殖与分化的影响采用不同强度、频率和占空比的REMF作用于成骨细胞，检测成骨细胞的

Using a semantic categorization task, Experiment 2 investigated into three-level Indonesian students lexical access of ideogram characters with different familiarities.

研究二采用语义范畴判断作业，旨在考察不同水平的印尼学生在认知高频、低频形声字时是否具有形旁提示整字意义的意识。

The adsorption properties, wetting ability and electrochemical impedance spectrum properties of graphite felts in vanadium electrolyte were investigated.

研究了不同氧化程度下的石墨毡在钒溶液中的吸附性、润湿性及其交流阻抗图谱，结果发现随着氧化程度增加，吸附性和润湿性增强；交流阻抗谱包括两个半圆和一条直线，高频半圆对应离子的吸脱附反应，低频半圆对应电化学反应，直线对应离子在溶液中的扩散过程。

In this article, method of moment and Floquet mode method will be applied to analysis the radiation and scattering of planar array and curved array. As one part of the work, the induced current on perfect conductor surface is computed with MoM method and graphed by Origin.

本文分别采用比较经典的低频方法—矩量法和一种专用于阵列分析的高频方法—Floquet模(FM，Floquet Mode)方法对有限阵列电磁散射特性进行分析。

ELF-EMF treatment not only increased the blood vessel formation of HUVECs, but also enhanced a functioning vascular network inosculating with recipient host circulation.

极低频电磁场处理不仅可以促进血管内皮细胞形成血管结构，而且形成的血管结构能够与宿主自身的血管结构相吻合。

The dynamical characteristics of a low voltage MicroGrid from grid-connected mode to islanded mode with different distributed generation configuration schemes are analyzed by using simulation method,and the corresponding changing laws of each DG's power,voltage and frequency of MicroGrid are obtained.

通过算例仿真研究了不同分布式电源配置方案下低压微网从并网模式向孤网模式转换的动态运行特性，获得了分布式电源的功率、微网电压和频率的变化规律。如果选择微型燃气轮机作为微网的功率支撑手段，在微网从并网向孤网过渡过程中，系统频率波动较大，且部分分布式电源有可能在低频保护动作下与电网隔离，不利于微网的稳定运行；增加储能设备后，储能设备对于微网的稳定运行可发挥重要的作用。

The study about the flux and index of gamma-ray loud blazars show:(1)there is significant correlation between the luminosities in gamma-ray and VLBI radio energy band;(2)there are strong anticorrelarions among the observed indices of soft X-ray, hard X-ray and gamma-ray. For the FSRQs, the whole X-ray emission was contributed by synchrotron self-Compton emission, for the HBLs, the X-ray emission was dominated by synchrotron emission while the soft X-ray emission is dominated by synchrotron emission and the SSC emission dominate the hard X-ray energy band for LBLs;(3) there are strong radio-radio and radio-optical flux correlations for the quasar 3C 273. The higher frequency emission leads those in lower frequency. The multi-band complex indices strongly correlated with the high frequency flux which implies that the object is becoming bright when the energy spectrum is harden.

通过对γ噪Blazar天体的谱指数、流量的相关研究，发现（1）51个样本blazar的γ射线光度与VLBI光度之间存在显著相关；（2）软X、硬X以及γ波段的观测谱指数之间存在较强的反相关，对FSRQs，无论是硬X射线还是软X射线的辐射都是逆康普顿辐射的贡献，而对于HBLs来说，则是同步辐射的贡献，对LBLs，在软X射线波段以同步辐射贡献为主，在硬X射线能区以逆康普顿贡献为主；（3）3C 273的射电各个波段以及光学之间存在强相关，高频辐射一直领先低频辐射，3C 273的多波段复合谱指数和高频流量之间存在强的反相关，意味着当能谱变硬时对象变亮。

We can see from the numerical results of the improved exhaust system in acoustic and fluid fields that: the improved design succeeds in increasing the attenuation performance and reducing the pressure loss and meliorating the aerodynamic quality.

改进后的流场和声场分析结果表明：改进设计使得排气系统的空气动力特性、低频、高频消声特性等方面都较原结构有所改善，达到了预期改进目标。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。