在无限和真空的空间中，地磁场在强度上随距离3次方而衰减。
In a infinite and empty space the geomagnetic field falls off in strength with the third power of distance.
由于卫星通信信道长，传输距离远，电波要穿过对流层和电离层，易使信号衰减，引入噪声，造成误码。
Due to satellite communication's long channel, far distance transmission and its wave through troposphere and ionosphere often brings the signal deamplification, noise and wrong code.
背压对贯穿距离、喷雾锥角、喷雾轴心速度和浓度衰减率的影响均大于启喷压力。
It shows that the effects of back pressure on penetration, spray cone Angle, and decline rate of centerline velocity and concentration of the spray are greater than that of fuel injection pressure.
激光雷达系统的作用距离由下列因素决定：脉冲能量、脉冲宽度、光束发散角、大气衰减、目标反射率和接收机灵敏度等。
The operating distance of a laser radar system is determined on pulse energy, pulse width, beam divergence angular, atmosphere attenuation, target reflection, receiver sensitivity and so on.
由于化学转换和衰减的作用，初生污染物随着下风距离而较快地减少，特别是在10公里以后的中距离上更加明显；
As a result of chemical conversion and decay, the primary pollutant decreases with the downwind distance more rapidly, especially as the mesoscale distance further than 10 km.
笔者提出了沿垂直方向、水平径向和水平切向振动时不同距离地震波衰减规律的经验公式。
An empirical formula was derived, which indicated the attenuation of the seismic waves at different distances along the vertical, horizontal and horizontal tangential directions.
对距离参数进行了修正，使地震动衰减和烈度衰减关系中的距离参数的定义尽可能保持一致。
The revised parameter has been adopted so as to maintain definition of distance parameter of seismic ground motion consistent with intensity attenuation relationship as far as possible.
仿真研究了传输信道和光功率对光码分多址系统性能的影响，分析了传输距离、光纤色散系数、光纤衰减、入纤光功率等与误码率和Q值的关系。
The influences of length, dispersion index and attenuation index of transmission fiber and incident optical power on ber (bit error rate) and Q value of the system is analyzed.
实验结果表明，该系统有效改善了VGA信号的衰减和失真现象，可保证信号的高质量、长距离传输。
The results show that the system improved the VGA signal attenuation and distortion, achieved high-quality, long-distance transmission.
缓冲区可分为空间物体与邻近对象只呈单一距离关系的静态缓冲区和空间物体对邻近对象的影响度随距离变化而呈不同强度的扩散或衰减的动态缓冲区。
Static buffer is only a simple zone around the entity, but in dynamic buffer, the influence is changed alone with the distance between the entity and the around objects.
本文重点介绍了雾衰减的经验模型，仿真分析了0.85和10.6在衰减系数和通信距离上的差异。
This article introduced the attenuation empirical model in fog, Simulation analysis the difference between 0.85 and 10.6 in coefficient of attenuation and communication distance.
本文重点介绍了雾衰减的经验模型，仿真分析了0.85和10.6在衰减系数和通信距离上的差异。
This article introduced the attenuation empirical model in fog, Simulation analysis the difference between 0.85 and 10.6 in coefficient of attenuation and communication distance.
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