查询词典 attenuation coeffcient

This shows that the usual estimator of the regression coeffcient is available when σ2 is unknown.

这表明当方差未知时，回归系数最小二乘估计是一个适合的估计。

Limit state equations for reliability of barrier pillar are given after analzing randomness of hydraulic pressure,tensile strength of coal bed and coeffcient of water inrush.

为了合理设计防水煤岩柱的宽度，使用了可靠度分析的&JC&方法，分析了水压力、煤层抗张强度及突水系数的不确定性，建立了防水煤柱可靠度分析的极限状态方程。

Since the attenuation of the free-space channel between ground and satellite is contributed by the aerosphere, its equivalent length is about 5 km and the total attenuation of round-trip is equivalent to 10 km free-space channel in the earth surface aerosphere.

由于地面-卫星之间的自由空间信道的衰减主要集中在地面大气层，其等效厚度约为5km，往返两次的信道衰减等效于地面大气层的10km。

The results show: 1 attenuation of available chlorine of bleaching powder in water follows the eqution ρ=a+be-kt,attenuation ratio constant increases with reduction in initial concentration of available chlorine, high temperature, increase in COD and light and decrease in pH.

关于漂白粉在养殖生产中应用的研究不多，赵增元等[1]报道了漂白粉在改善对虾池水环境方面的一些结果，王勇强[2]就其对细菌性虾病防治的药理进行了研究，刘长发等[3]报道了漂白粉的清塘效果及其对虾池水质的影响。

The results show: 1 attenuation of available chlorine of bleaching powder in water follows the eqution ρ=a+be(superscript -kt), attenuation ratio constant increases with reduction in initial concentration of available chlorine, high temperature, increase in COD and light and decrease in pH.

结果表明：1漂白粉有效氯在水中按ρ=a+be规律衰减，衰减速率常数随初始有效氯浓度的减小、温度的升高和COD的增大而加快，随pH的下降和光照强度的增加而增加。

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。

From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先从一般的等效电路模型出发，根据Bloch周期性理论对该结构的相移、衰减和阻抗特性进行了分析，结果表明该新结构具有类似带通滤波器的特性：通带内衰减常数为零，特性阻抗为实数并随频率连续平滑分布，具有可任意指定的阻抗匹配带宽；带外特性阻抗为纯虚数，电磁波传播受到抑制。

The anisotropy of phase velocity, quality factor and attenuation were studied, and then, the effect of attenuation anisotropy of the cap rock on AVO analysis was investigated.

目前，对介质衰减各向异性性质的研究主要集中在均匀介质中，而衰减各向异性对反射地震数据的影响则较少考虑。

Temperature is key factor for natural attenuation of nitrobenzene. The present study investigated the nitrobenzene of natural attenuation and nitrobenzene of bio-argumentation at 4℃and 20℃.

利用人工配制的2种不同浓度（1000和100μg·kg-1）的硝基苯污染底泥，研究了4℃和20℃ 2种温度条件下硝基苯的自然衰减和生物强化降解情况。

Generally speaking, the high group velocity and low attenuation factor and high Q〓 in the same area, but relatively low group velocity and high attenuation factor and low Q〓 in the same area in China is the general distribution.

在不同周期，面波衰减系数或品质因子在整个中国大陆区域分布是不均匀的；总体表现为高群速度分布的区域呈现高Q〓和低衰减系数、低群速度分布的区域呈现低Q〓和高衰减系数分布的特点。

Pradeep Indulkar, a senior official at the Maharashtra state Home Ministry say 101 human were killed and 287 injured.

马哈拉施特拉邦内政部高级官员Pradeep Indulkar称，有101人在冲突中丧生，287人受伤。

Mark Frei, a senior vice president of West, says 80% of West's homeagents have some college education, compared with 30% of those whowork in office-based call centers.

Frei说，该公司80%在家办公的人员都拥有本科学位，而在公司电话中心工作的人中只有30%拥有本科学位。