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When the ratio of signal Airy disk radius to local oscillator Gaussian 1/e field radius at focal plane is 1.71, maximum heterodyne efficiency of 81.45% can be obtained.

当焦平面上爱里斑半径与本振高斯光束光腰半径之比为1.71时，有最大外差效率81.45%。

Based on the well-know Pennes'' bioheat equation,we calculated theoretically temperature field of HIFU-induced BFR in tissue,and measured spatial temperature rise in BFR induced by HIFU in freshly excised cow liver at constant acoustic intensity and exposure time, and studied the effects of the physical parameters of focused ultrasound transducer such as frequency,outer radius and curvature radius,focal depth, and acoustic intensity and exposure time on the temperature field of HIFU-induced BFR.

采用生物热传导方程理论计算了HIFU生物学焦域温度场，采用微型热电偶探针测量了HIFU辐照离体牛肝时靶组织温度分布；研究了聚焦超声换能器的物理参数、辐照深度和治疗剂量对HIFU生物学焦域温度场的影响；研究了HIFU在牛肝组织中的传播衰减。

The technique of laser light scattering has been widely used in the investigations of biomacromolecule solutions, which can provide some more important parameters such as molar mass, root-mean-square radius of gyration, the second virial coefficients, diffusion coefficients and hydrodynamic radius. Therefore, it is very sutiable for the study of state behavior of biomacromolecule solutions.

激光散射技术在生物大分子溶液性质研究方面的应用越来越广泛，它可以提供大分子的重均分子量、均方旋转半径、第二维里系数、平动扩散系数及平均流体力学半径等重要参数，这对于研究生物大分子的溶液状态行为特别适用。

Concave reflecting surfaces of spherical cap, paraboloid and hyperboloid of revolution are investigated with regard to the dependence of the levitation force on the section radius Rb and curvature radius R of the reflector.

针对球面、旋转抛物面和旋转双曲面三种形状的凹面反射端，系统研究了悬浮力与反射端截面半径R_b和曲率半径R之间的本征关系。

That is: the optical fibers which are to be tested will wind the same circle according to different radius or will wind the different optical fibers circles according to the same radius, making the direction of incident ray side vibration as parameter, we have done the specific experiments and theory analysis to winding waste of quartz system, both refraction optical fibers and Elastic-optic effect of optical fiber.

即把待测光纤以不同的半径缠绕成相同的光纤圈和以相同的半径下缠绕成不同的光纤圈，以入射线偏振光方向为参数，对单模石英系双折射光纤的弯曲损耗与光纤的弹光效应进行了的具体的实验和理论分析。

It was found that compared to the curvature radius, the equivalent radius of indenter played a much more important role on the nanofretting damage of material.

结果表明，相对于尖端名义曲率半径，压头在一定压入深度下的等效曲率半径是决定材料纳动损伤的更有效参数。

The influence of indentor radius on the plastic deformation has been discussed and some important results are as follows:(1) The influence of the ratio of ceramic coating thickness to indentor radius on the failure of coating, plastic deformation of substrate and crack propagation are obvious.(2)The propagation of crack in ceramic coating is assumes to be of semi-elliptical shape under normal contact with a rigid sphere.(3)Fatigue life of ceramic coating is mainly decided by substrate and load, the lower substrate elastic moduli and load, the more cycles of fatigue.

分析了压头半径对塑性变形的影响，模拟结果表明；(1)陶瓷涂层厚度和压头半径之比对涂层失效、基体塑性变形及裂纹的形成有显著影响；(2)在刚性球压头静态挤压条件下，陶瓷涂层中的预制裂纹按照椭圆形裂纹规律扩展；(3)陶瓷涂层的疲劳寿命与基体和载荷有很大关系，基体弹性模量越小，疲劳寿命延长。

The overcutting on tool end is checked via comparing the tool radius with the circumradius or the radius of inscribed circle, and the touch interference of tool body based on the symbol of the vector distance from the triangle vertex to the tangent plane of tool body column.

在曲面加工的无干涉路径规划中，通过恰当选择刀具初始位置避免了接触点处的曲率干涉；通过比较刀具半径与曲面上三角片外接园半径的大小即可判断刀具底面干涉；而根据三角片顶点与刀杆切平面的有向距离的正负来判断刀杆碰撞干涉。

Based on the Eulerian two-fluid model and with the use of numerical simulation software Fluent, the paper simulate the coal gasification plant's operation state without chemical reactions involved, and mainly discuss the temperature and the interstice distribution in the coal gasification plant, under the condition of different inner cylinder radius and outer cylinder radius.

基于Eulerian双流体模型，利用Fluent数值模拟软件针对煤高效制合成气装置进行无化学反应参与的运行状态的模拟，重点讨论在不同的内筒半径和外筒半径的条件下，气化装置内的温度和空隙率分布情况。

The results showed that: the knifepoint radius, the cutting edge blunt round radius and feed rate are considered as critical parameters to get high-quality for the machined surface.

结果表明：正确地选择刀尖圆弧半径、切削刃钝圆半径和进给量是获得高质量加工表面的有力保证。

More than five decades after the Indian constitution promises a casteless society, there is no sign that the castes are disappearing.

在印度宪法允诺一个&无种姓&社会五十多年后，种姓尚没有显示出任何要消失的迹象，但变化也确确实实地发生了。

Don't distract him from his studies.

他在学习不要打扰他。