衰减

The contents can be outlined as follows. Chap. 1 provides an overview of the studies on transient EM radiation and the propagation of nonsinusoidal waves in lossy medium.

这些进展主要涉及对非正弦波辐射能量慢衰减现象的深入认识以及非正弦波进入有耗媒质中传播时Maxwell方程组的适用性及其求解。

In view of this problem,a parameter extremum optimization model is developed,in which such error factors as the decaying DC components,nonsynchronous sampling and harmonics are precisely depicted.A new measuring method based on the hybrid genetic algorithmis developed to use this model for finding accurate power system parameters such as the amplitude,phase,frequency and harmonics.

针对这一问题，建立了电力参数极值优化模型，同时对衰减直流分量、非同步采样及谐波等多个误差参数加以精确表示，利用混合遗传算法对该模型进行求解，可得到准确的系统幅值、相位、频率及谐波等电力参数。

The rapid decrease of Ostracoda in the Late Pleistocene resulted from the last glacial stage in which the global climate became extremely cold.

inermis等介形类动物群的急剧衰减则与全球气候骤然变冷的末次冰期事件有关。

The results indicate that:① Soot records is one of direct and effective means;② Overdriven detonation appears only once and several blasts appear in DDT (Deflagration to detonation transition);③ The dimension of acetylene is less than that of hydrogen under the same initial condition.

试验结果表明：①烟迹法是研究DDT更为直接和有效的手段之一；②在本试验条件下，观察到DDT过程中过爆只会出现一次，但从过爆衰减至正常C-J爆震波的过程中存在多次多点爆炸的迹象；③初始条件相同的情况下，乙炔的胞格尺寸小于氢气的胞格尺寸。

Further, the hot spot is amplified to form the overdriven detonation wave, then, the overdriven detonation wave gradually becomes the steady detonation wave.

形成的热点迅速放大成为过驱爆震波，并逐渐衰减为稳定爆震波。

We investigate a simple atom laser model by introducing phenomenologically gain and loss terms in the GP equation, noting that we don't consider output coupling in this model, and discuss analytically threshold and stability of lasering mode.

我们研究了一个简单的原子激光器模型。这个模型是一个被引入增益和衰减项后的GP方程，注意，在这个模型中我们没有考虑输出耦合。

The 400-meters dash belongs to ultimate periodic games and is regarded as a short-distance run which can be divided into 3 periods—the period of acceleration, period of remaining maximum speed and the period of attenuation. The 400-meters dash follows the statistic rules which can be reflected from the following stage: starting the race, accelerating, reaching the maximum speed and gradually attenuating. In fact, it reflects the process that energy is provided. It is a changing process of energy providing—from phosphagen system,glycolysis system to aerobic oxidization system.

400m跑属于极限强度的周期性运动，被视为一项以速度为主的体能类短跑项目，其全程速度的变化一般可分为三个阶段，即加速阶段、最高速度保持阶段和速度衰减阶段。400m跑从起跑加速到获得最大速度后又逐渐降低的统计学规律，实质上反应了能量供应方式从磷酸原系统、糖酵解系统到有氧氧化系统的转变过程。

Their emission spectra were studied by photostationary fluorescence measurements and time-resolved fluorescence measurements.

利用稳态荧光光谱和时间分辨光谱技术对化合物在溶液中的荧光发射及激发态衰减行为进行了研究。

Euphotic depth ; South China Sea ; diffuse attenuation coefficient ; photosynthetically active radiation

真光层；南海；漫衰减系数；光合有效辐射

The volume of phreatic water suitable for irrigation increases and the extent of desalinized field remarkably e...

本文以青铜峡灌区水土化学40多年动态监测资料为依据，探讨和评价其盐量的衰减和积聚的进程，为拟

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。