查询词典 emission rate

The is related to the frequency dependent absorption cross section and the density and spatial distribution of atoms in the lower level of the transition. Position dependent 5P3/2 state densities had been combined with the collisional broadening rate 5P3/2 5S1/2 line due to both helium and cesium perturbers to yield the .The effective radiative rates of the Rb D2 line as a function of the He pressure PHe were obtained . The fluorescence intensity I780 of the 5P3/2 5S1/2 emission was measured simultaneously.

由于辐射陷获存在，有效辐射率是自然辐射率与透射因子（发射的光子在探测区域内没有被吸收的平均概率，它与吸收截面及激发态原子密度和空间分布有关）的乘积。5P3/2原子密度及其空间分布结合5P3/2 5S1/2跃迁线的碰撞增宽计算了透射因子，从而得到了不同He气压下，Rb D2线的有效辐射率。

In order to analyze the characteristics of multi-position pumped fiber laser expediently, the predominant part of the re-emission was adopted to improve the solutions precise, and the rate equations describing the Yb-doped multi-position pumped fiber lasers were solved analytically.

为了方便地对多点抽运光纤激光器的特性进行分析，采用保留上能级粒子再发射项主体部分的方法以提高精确度，解析求解了多点抽运掺镱光纤激光器的稳态二能级速率方程组，得到了光纤激光器的输出功率的近似解析解。

An explicit analytical solution of the threshold pump power of the laser has been derived based on rate equations which contain the attenuation coefficients of the pump and laser radiations as well as the major contribution of the re-emission of the upper level atoms to the pump wave by using the analytical solutions. An analytical solution of the minimum fiber length required for the onset of the oscillation is presented. In addition, the analytical solutions describing the variations of the density of the pump radiation and upper laser level population along the fiber length have also been given.

从速率方程组出发，在不忽略光纤损耗系数和保留再发射项主导部分的近似条件下推导出了双包层光纤激光器阈值泵浦功率的显函数解析表达式，得到了光纤激光器产生振荡所需的最小光纤长度的显函数解析解；还给出了泵浦光子数密度和上能级粒子数密度沿光纤方向随光纤长度变化的显函数解析解。

When the condensed water discharge is completed, the subsequent emission of steam, due to condensation of water vapor than the volume and velocity, to generate pressure up and down the valve, the valve in the suction flow rate of steam rapidly closing.

当凝结水排放完毕，蒸汽随后排放，因蒸汽比凝结水的体积和流速大，使阀片上下产生压差，阀片在蒸汽流速的吸力下迅速关闭。

The flux rate of methane emission from the peatland in Qinghai-Tibet highland and the freshwater marsh in Sanjiang plain ranged from 0.16 to 10.0 mg CH4 m-2 h-1 with an average of 2.96 mg CH4 m-2 h-1 and 0.16-54.6 mg CH4 m-2 h-1 with an average of 19.6 mg CH4 m-2 h-1, respectively.

依据本研究野外实际测定的甲烷排放通量和前人已有的研究结果，初步估算了我国沼泽湿地甲烷年排放总量为1.76Tg ，占全球沼泽湿地甲烷排放总量68Tg 的2.59%。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。