近似公式

Hence, based on acoustic potential function and boundary condition on solid interface, we get reflection coefficient and refraction coefficient of longitudinal wave and transverse wave on solid-solid interface, and provide approximate formula of the reflection coefficient and the refraction coefficient about the first critical angle of incidence. We analyze relation between the refraction coefficient and acoustic impedance.

为此，基于固体介质的声势函数和界面的边界条件，推导了固-固界面纵横波的反射系数和透射系数，以及第一临界角入射情况下反射系数和透射系数的近似公式，并且分析了透射系数与声阻抗之间的关系。

When the distance between microstructures is larger than 1μm, the influence of space charge is a negligible quantity, and the approximation of metal formula could be used.

研究了介观尺度下半导体表面空间电荷层对微结构间静电作用力的影响，并同宏观尺寸下采用的金属近似公式进行了比较，揭示了半导体表面空间电荷对静电作用力的影响同微结构间距离、材料掺杂浓度等因素的关系。

Based on different P-wave phase velocity approximations, different traveltime-distance formulae can be deduced.

基於不同的相速度近似公式会得到不同的时距关系式。

In the project of building road, calculating the quantity of earthworkapplies approximative formulation.

在筑路工程中，土方量的计算一直沿用近似公式。

The generable proximate formula of dynamic stress intercity factor of simple edge crack found bar specimen in three point bending of NanLing marble is gotten and the critical dynamic stress intensity factor of the specimen is also obtained in medium load ratio.

在中等加载速率下，推导出对大理岩带垂直切口三点弯曲圆棒梁试件动应力强度因子的一般近似公式和断裂时的临界动应力强度因子的表达式。

By deducing the calculation formula of luminaire efficiency and illuminance on working face, and analyzing a case of lighting, the paper can help lighting designers design efficient and excellent lumination by aptly using luminous intensity distribution curve.

结果 推导出利用配光曲线计算灯具效率和工作面照度的近似公式。结论灯具的配光曲线能够反映出灯具的许多重要特性，配光曲线在照明计算中提供又一便捷工具，正确利用灯具的配光曲线，对建筑照明设计具有重要的指导作用。

The similar formula of bending stiffness was given about the wooding sandwich construction and the formula can forecast the stiffness of sandwich construction.

结果表明：木质蜂窝夹芯材料的抗弯性能较原蜂窝纸板大大提高，给出的木质蜂窝夹芯材料抗弯刚度的近似公式可以预测夹芯结构的刚度。

Through introduction of improved cofficient and time error that is observed simultaneously the author makes an inductive reasoning of two similar formularies,which can be applied to current regulator tube scanning circuit .

引入了恒流管扫描电路在同一时刻的改进系数和时间误差，归纳了两个近似公式，对几种恒流管扫描电路的性能作了深入一步的研究，并且简化了对该电路的计

On the basis of analyzing the blasting characteristics of rock at bench slope in open-air blasting,this paper puts forward a calculation model of front-row burden,and deduces an approximate formula for calculation of reasonable front-row burden length for open-bench blasting ,which can be used as reference for blasting design.

在分析露天台阶爆破时台阶坡面岩石爆破特点的基础上，提出了台阶爆破前排抵抗线长度计算模型，从而推导出计算合理前排抵抗线长度的近似公式，可供爆破设计时参考。

On the basis of analyzing the blastingcharacteristics of rock at bench top in multi-row bench blasting, this paper puts forward a calculation model, deducces an approximate formula for calcualtion of reasonable stem length for multi-row bench blasting, which can be as reference for blasting design.

在分析台阶多排孔爆破时台阶顶部岩石爆破特点的基础上，提出了多排孔台阶爆破堵塞长度计算模型，从而推导出计算合理堵塞长度的近似公式，可供爆破设计时参考。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。