查询词典 attenuation factor

Furthermore, we separate the contribution from the leakage and cutoff effect to the attenuation constant, and then deduce an expression to determine the leakage in the reactive region.

根据该准则我们还进一步分离出泄漏效应和截止效应各自对衰减常数的贡献，并推导出在截止区内表征辐射能力大小的表达式。

The results show that there are three discontinuity points at the critical angle of the phase constant, the critical angle of attenuation constant and 90°.

结果表明：入射角在相移常数临界角、衰减常数临界角和90°处，横向偏移曲线存在三个间断点。

According to the importance of frequen-cy in power system operation,the authors tested andcalculated the frequency attenuation time constant Tfand the static load frequency coefficient KL,whichcharacterinze the frequency variation of power system.

根据电网频率运行的要求，对表征电网频率特性的频率衰减时间常数Tf、静态负荷频率调节系数KL进行了试验研究和理论分析计算。

The important parameters for RF circuit suchas dielectric constant, attenuation losses and loss tangent were extracted successfully.

因此， 在CMOS 制程中设计整合被动微波元件时，克服Low k 层好的介电损失将是设计上的ㄧ大挑战，在本计划中提出以步阶阻抗谐振器与共平面波导减少介电损所造成的损失。

The experimental results show that:(1) for ideal spheres, the attenuation coefficient of velocity is constant, the air drag coefficient is slightly affected by the initial velocity and is a linear function of initial velocity, and (2) for real fragments formed by a warhead, the flight performances are different from ideal spheres, the air drag coefficient is affected by the flight velocity and is a linear function of flight velocity.

实验结果表明：(1)对于理想球形钨合金破片，在同一初始速度条件下，衰减系数为常数，空气阻力系数与初始速度有关，两者成线性关系；(2)对于经历爆轰驱动的球形钨合金破片，由于有轻微的质量损失和变形，速度衰减规律与理想球形钨合金破片有明显的区别，空气阻力系数与飞行速度有关，两者成线性关系。

Simulation results show that, for the fixed sampling frequency, the error rises with the frequency increasing of periodic signal, and decreases with the attenuation time constant increasing of non-periodic signal. The sampling frequency determines the upper limit of appropriate frequency band directly. The research provides the basis for the selection of cutoff frequency in filter design.

仿真结果表明，在采样频率确定时，对于周期信号，计算误差随频率的增加而增大，而对于非周期信号，计算误差随衰减时间常数的增大而减小，采样频率大小决定了插值法用于分布参数模型的适用频带上限，该研究为滤波器设计中截止频率的选择提供了依据。

Based on the existence of the solution to a LMI, a sufficient condition is obtained under which the composite systems can be quadratically stabilized with a H〓 norm bound constant on disturbance attenuation for all admissible uncertainties and a necessary and sufficient condition is obtained using BMI.

采用线性矩阵不等式方法，给出了系统可鲁棒H〓分散镇定的充分条件；采用双线性矩阵不等式方法，给出了系统可鲁棒H〓动态输出反馈分散镇定的充要条件，并给出了算法。

Two useful formulae for calculating the attenuation constant of conductor loss for TEm0 and TE0n modes of the rectangular waveguide are derived, and the loss characteristic in the rectangular waveguide is analyzed and computed.

根据横向谐振原理和微扰理论，本文提出了一种分析非理想波导损耗特性的新方法，推导出了一组计算矩形波导TEmO和TEOn模导体损耗的衰减常数公式，并分析计算了矩形波导的损耗特性。

The retardation coefficients are 2.22 and 1.74 of silt medium and sand medium respectively. According to first-order reaction, s total natural attenuation rates constant are 0.0635/h and 0.0059/h respective of silt medium and sand medium.

根据一级动力学方程计算得出，硝基苯在淤泥介质中的自然衰减总速率常数为0.0635/h，在砂砾介质中的自然衰减总速率常数为

Compared to wet season, arsenic is difficult to mobile in dry season. Attenuation constant in dry season is 0.3082(1/km), but it is 0.0569(1/km)in wet season. If initial concentration of As was 500μg/L without other contamination source in down stream, arsenic would deceased to 50μg/L in down stream 7.5km in dry season but 40km in down stream 40km. As is dominate species in river running throμgh mining area.

砷在枯水期较丰水期难以迁移，通过计算得到，在枯水期砷的衰减系数K值为0.3082(1/km)，而在丰水期为0.0569(1/km)；在污染口浓度达到500μg/L时，下游没有其它的砷的污染源(或会影响砷衰减的其它污染源)时，枯水期砷会在下游7.5km之后浓度降到50μg/L，而丰水期则要在下游40km之后才能降到同样的值，所以在丰水期砷污染的影响的流域更广。

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。