近似公式

The validity of the analysis by transmission line theory and the approximate formula is confirmed by comparison with some experimental results.

进而在传输线理论分析PIFA输入特性的基础上，为工程设计导出了谐振频率的近似公式。

The effects of mass ratio on dynamic Characteristics were investigated by solving the dynamic equation of the model. The approximate formula of seismic response were deduced based on Energy Conservation Law.

通过求解简化模型的动力方程，分析了质量比对连续梁桥纵桥向的动力特性的影响，并用能量法推导了低阶振型地震反应的近似公式。

If the apparent field of view is known,''' the actual field of view can be calculated from the following approximate formula

如果已经知道视视野，'''实视野可以经由下面的近似公式计算

All the WGMs spectra of cylindrical micro-cavities with four different diameters are precisely indexed by an explicit asymptotic formula with the positions and separation as parameters.

利用柱形微腔回音壁模式位置和间隔的解析近似公式，对实验所得的透射光谱做了模式的精确标定，共振波长的实验值和标定值间的误差小于0.05nm。

The theory of AVO is based on the Zoeppritz equations, which are complicated for reflection and transmission coefficients.

精确的Zoeppritz方程描述了反射振幅信息量与弹性参数之间的关系，其近似公式是进行AVO反演、AVO交汇图分析、岩性预测和烃类检测的基础。

Three kinds of mass attenuation coefficient have been used, which are the monoenergetic MAC at the mean energy of the MC simulated spectrum, the effective MAC of the Born approximation formula spectrum and the effective MAC of the MC simulated spectrum.

在密度提取中使用了3种不同的吸收系数－MC谱光子平均能量对应的单能质量吸收系数、波恩近似公式谱有效质量吸收系数和MC谱有效质量吸收系数。

When calculating the pressure loss of laminar flow for Casson fluid in drilling tools, there is a need for a nonlinear equation. It used to be calculate by approximate formula.

在计算卡森流体在钻具中的层流压降时，需要求解一个非线性方程，以往通常使用近似公式进行计算。

Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

Guan Lingyun Upper and lower bounds of effective bulk and shear moduli for elastic composite materials with general ellipsoid of revolution inclusion have been calculated by using the approximate formulae ,which related to the effective moduli of composite materials with imperfect interface under finite deformation ,in reference .

应用文献〔13〕中有限变形下非完美界面弹性复合材料有效模量的近似公式和微分几何方法，计算了含一般旋转椭球体夹杂弹性复合材料有效体积模量和有效剪切模量的上下限界。

A formula of the frequency change has been deduced from the wave equation to the first order approximation.

从波动方程出发，导出频率改变的一级近似公式。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。