指数衰减

Attenuation induced by rain is prediceted with the equivalent complex refraction constant. The attenuation predicted is nearly consistent with that calculated by the formula recomended in ITU-R and measured results, which testifies that the method used in that paper is effective.

然后，利用所得公式计算得到的等效复折射指数预测了降雨衰减率，预测值与ITU-R推荐公式计算结果及实测值基本符合，说明文中所使用的方法是有效的。

With the solutions of the biharmonic equation at boundary value in a semi-infinite stripe,a weighted energy function is established.

对半无限带状区域上双调和方程边值问题建立了能量衰减估计，证明了以方程的解建立的加权能量随着与区域有限端距离的增长，该能量呈指数式衰减。

A necessary and sufficient exponential stability theorem with respect to a constant decay degree for general nonlinear dynamical systems is presented.

首先给出了一般非线性动态系统的关于常衰减度的指数稳定性充分必要定理，接着探讨了新型指数稳定性定理在线性系统稳定性分析中的应用。

The results show that, in the lower voltage regime, the molecular currents decreased exponentially with the molecular length, and the corresponding decay constant is about 1.41/CH2. Furthermore, the decay constant is demonstrated to be almost independent of the external voltage.

研究结果表明，在低的外加偏压下，烷烃硫醇分子电流值随着分子链长度的增加而指数减小，其衰减常数约为1.41/CH2，且衰减常数基本上与外加偏压值的大小无关。

In particular , when f = 0 , we prove exponential decay of logn towards the constant steady state log n_∞= 0 in the L~1 norm for long times and give the explicit rate of decay.

特别地，当f=0时，边界条件记为： n=1，n_x=0，on aΩ我们证明了当时间t→∞时，log n在L~1空间中关于时间t按指数形式衰减到0，并且给出了显式的衰减速率。

As to the range of the coupling, it is expected to decay of index law in limited temperature, and it is expected as 1/R(superscript 3 subscript ij) at T=0 K.

至于耦合的范围，在有限温度时它将按指数规律衰减，在T=0 K时预期按1/R(上标 3 下标ij)衰减。

The study on the attenuation law with statistic analysis and dimension analysis reveals that the attenuation index, closely relative to the properties of soil mass, can be expressed as a third order polynomial of vibrating frequency f.

用统计分析和量纲分析的方法研究了强夯振动的衰减规律，发现强夯振动衰减指数与场地岩土体的性质密切相关，可表示为振动频率的三次多项式的形式，为强夯振动的频域分析以及利用强夯振动研究岩土体的性质奠定了基础。

The results indicated that the illumination intensity is fitted by the Exponent model, and the declining coefficients of metal halide lamp and high pressure sodium lamp are estimated to 0.1999 and 0.6353 respectively.

经测定分析和模型拟合，金属卤化物灯和高压钠灯的灯光衰减曲线符合指数模型，金属卤化物灯和高压钠灯的衰减系数分别为0.1998和0.6353。

As a result, dual fluorescence was observed in non-polar solvents. Long-wavelength emission was found to consist of two components:+D||A" exciplexes resulted by "harpooning effect" and +D^^A" exciplexes stablized by solvation.

研究结果表明：合成的化合物在非极性溶剂中有双重荧光的稳态发射行为；双重荧光中的长波长发射经时间分辨光谱研究为双指数发射衰减；其中的长寿命衰减是由于该类化合物在非极性溶剂中激发后经过分子内电荷转移形成了激基复合物所致，而产生该激基复合物的直接原因是由于在非极性溶剂中的&harpooning effect&所致，短寿命则来自于该类化合物激发后在溶液中发生了分子内电荷转移的直接衰减。

The exponential regularity of the shock wave attenuation coefficient versus the charge diameter in PMMA was obtained by fitting experimental data.

利用锰铜压阻传感器法测量了某聚奥传爆药在不同直径下的小尺寸装药爆轰输出冲击波经不同厚度有机玻璃隔板衰减后的冲击波压力，通过对实验数据进行拟合，得到了有机玻璃介质中冲击波衰减系数与装药直径的指数型关系。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐