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The parameter of laser energy transfer efficiency is used in the new model with a clear physical meaning for the first time. The mean absorption factor of laser induced plasma to the laser within the keyhole is calculated according to different welding parameters using the relative intensity method of spectral lines.

首次有机地将激光焊接能量传输效率这一重要的焊接参数以明确的物理意义引入数学模型中；通过谱线相对强度法计算推导出每一个焊接规范下小孔内等离子体对激光的平均吸收系数。

At present, even the actual line parameters of the individual absorption line can only be determined to within 10%.

目前甚至个别吸收线的实际线参数精度也只能确定到 10%以内，因此不要期望这些值的精度优于 10%。

A novel Er3+-doped tellurite glass with compositions of TeO2-ZnO-Na2O-Bi2O3 was prepared, and the intensity parameters, spontaneous emission probability, absorption and emission cross-section of Er3+ ions were calculated according to the Judd-Ofelt and McCumber theory.

研制了一种新型掺铒碲酸盐玻璃TeO2-ZnO-Na2O-Bi2O3，利用Judd-Ofelt和McCumber理论计算了Er3+离子的强度参数、自发辐射几率、吸收截面和发射截面等光谱参数。

TIAN Wen-sheng（Chaigoubu Teachers School,Zhangjiakou 076150,China）Abstract:Taking account of δr≠0,through the equation of conservation of orbital angular momentum,orbital parameters equations on the mass change are re-deduced.

Ba星系统的星风吸积及污染因子刘俊红和仲池田文生摘要：用整个系统的角动量守恒条件代替切向动量守恒条件，且δr≠0，考虑轨道偏心率的高次项，推导了星风吸积质量及轨道参量变化方程。

The operating parameters to determine the isotope abundance ratio for 〓Pu/〓Pu by ICP-MS were optimized for the first time in China.

采用优化的仪器条件，测定了〓Pu／〓Pu的比值。将同位素稀释法应用于ICP-MS，测量了环境样品中Pu的含量。

Sometimes it makes possible to accelerate work, to increase safety and to dispose the important parameters of system.

有时，它使得有可能加快工作，以增加安全和处置的重要参数的系统。

Three dimensionless control parameters have been taken into account : the ratio of centrifugal acceleration and gravity.

实验主要的三个无因次控制参数包括：离心加速度与重力比值、正向韦伯数及切线向韦伯数。

Pressure, density and acceleration of gravity are important parameters in the earth interior. The value of these physical properties is provided by Preliminary Reference Earth Model PREM.

压强、密度及重力加速度是地球内部物质的最重要的物理参数，而"初步参考地球模型"给出了这些物理特性的一些具体数值。

The results presented in this paper can be used as the basis on designing the accelerometer parameters.

有关结果可为这种加速度计参数设计提供理论依据。

Main factors are:(1) lower inspection and acceptance criteria;(2) structural measures,(3) erection parameters.

主要因素是：(1)较低的检查和验收标准；(2)构造措施；(3)搭设参数。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。