衰减的

The research status of power line communication technology, lighting technology and routing algorithm are summarized. The frame of this thesis is presented.

第二章分析了电力线载波通信信道的噪声、阻抗和衰减特性，得出这些特性均具有时变性和随机性的结论。

Results showed that under certain conditions,the concentration of formaldehyde emitted quickly increased to a maximum value in several hours,and then began to decline until it reached a steady value.In the steady emission state,environmental factors had remarkable effects on formaldehyde and other VOC emissions.

研究发现：在模拟的空气环境条件下，胶合板甲醛释放呈现的规律为：在较短时间内急速上升，达到最大值后逐渐衰减，直到趋于稳定值；在稳定释放状态，环境因素对甲醛及某些VOC散发有显著作用。

The attenuation of the leachate pollutants in the subsurface environment is closely related to the microbial activity.

渗滤液中污染物在地下环境中的衰减与微生物的活动息息相关。

This supposal was further conformed with NO2 symmetric stretching vibration which was found in the ATR FT-IR spectra of hair samples treated with NBD-C1 at pH3 medium.

介质pH3处理的发样表面衰减式全反射红外光谱结果出现硝基对称伸缩振动峰，进一步支持NBD-Cl与头发表面半胱氨酸发生特异性结合的结论。

In this paper,the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.

1 前言各种介质的声学特性主要由声速、声衰减、声阻抗等参数来描述，这些量统称为介质的声学特征量。

By analyzing the force on a single droplet, the function of droplet velocity with time was obtained, and calculation results showed that the droplet velocity had a quick decent, and dropped to its terminal velocity in 0.6 s.

对单液滴进行受力分析，推导出了液滴运动速度与时间的关系式，并针对CO2-H2O体系计算了不同液体雾化压力下液滴速度的变化，结果表明，液滴速度衰减很快，在0.6 s内液滴趋近其终端速度。

To evaluate the capability of ESD protection of materials entirely, it designed a multi2function electrostatic charge decay test device based on single chip computer.

为全面评价材料的防静电能力，研制出以单片机为核心的多功能静电衰减时间测试仪。

However, mobility degradation and threshold voltage instability are the biggest concern.

然而，在高介电常数中所产生的迁移率衰减与临界电压漂移都是主要的存在问题。

To make use of finite element method, the field of electromagnetic wave propagating in trapezium tunnel was studied. The attenuation rate and its numerical analysis were deduced on the foundation of tiny-intervene method and the calculating program was also compiled.

应用有限元方法研究了梯形隧道中的波导场问题，并以微扰法为基础推导了波模衰减率的计算公式，编制了计算程序。

As a rapid calculation of radioactive shield attenuation in truncated cone, the cross points penetrated through the truncated right angle cone shielded region from source points to the detector point have been studied via numerical analysis.

提出一种数值解析法计算从放射线源到评价点的放射线所穿透圆锥台形屏蔽物体的交点坐标，从而可快速预测辐射屏蔽衰减率。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。