对数

This is the logarithmic spiral geometric property, may explain why the humanity to the random orientation observation, the universe is accelerating to inflate.

这是对数螺线的几何性质，可以解释人类为什么向任意方向观察，宇宙都在加速膨胀。

Calculation and Analysis of the Contact Strength of Logarithmic Spiral Profile Connection

若改用对数螺线作为铣刀铲背曲线，则克服了阿基米德螺线的不足。

It is assumed that potential sliding surface of the soil in the back of the retaining wall is composed of logarithmic spiral arc and line.

假定挡土墙后土体潜在滑裂面由对数螺线滑动面和平面组合而成，根据挡土墙后土体薄层单元的平衡条件推导出粘性土层主动土压力的计算公式。

However, logarithmic spiral can be used to substitute for the Archimedes curve to solve such problems and guarantee the stability of cutter machinability.

若改用对数螺线作为铣刀铲背曲线，则克服了阿基米德螺线的不足。

The authors establish a rotational failure mechanism with combination of different logarithmic spiral arcs based on the theory of limit analysis method.

以极限分析方法为理论基础，建立分段对数螺旋线滑面的旋转破坏机制。

Then the influence of the different Coanda surface shapes including the circle, elliptical and logarithmic spiral TE geometries on the performance of the circulation control airfoil were investigated.

在此基础上研究了具有圆、椭圆和对数螺线形式柯恩达表面的环量控制翼型性能的变化，初步探讨了射流层附壁与高曲率表面特征参数的关联。

Reissner topic,which thinks fracture plane behind retaining wall is made up of a logarithmic spiral and a straight line,and by using limit equilibrium and constrained optimization,the formulas of active earth pressure,the resultant force of earth pressure and its application point are obtained.

基于普朗德尔-瑞斯纳课题认为，挡土墙土体破裂面是由对数螺线与直线组成的复合滑动面的结论，采用极限平衡法和约束优化相结合的方法，重新推导了主动土压力及其合力和作用点高度的计算公式。

A model is erected for Fs with logarithmic spiral sliding surface which can simulate the genuine sliding surface better than others,then the express of Fs is deduced based on the upper bound theorem of limit analisis.

采用对实际滑裂面模拟较好的对数螺旋曲线滑裂面，建立了整体稳定安全系数F_c的模型，从极限分析中的上限理论推导了整体稳定安全系数F_c的表达式。

Based on the meshing theory of logarithmic spiral bevel gear, the location and the movement relationship between the tool and the machining gear in the processing technology of logarithmic spiral bevel gear are studied by establishing the mathematical model of multi-axis NC machines.

目的 针对提出的一种新型锥齿轮-对数螺旋锥齿轮，研究其加工工艺过程中刀具与加工齿轮间的位置与运动关系，以便最终实现这种新型锥齿轮的加工。

this article has briefly analyzed some good and bad points about slip crack surface form of slope stabilities , introduced one kind of new slip crack surface form -logarithmic spiral slippery fracture in this foundation.

简要介绍一种新的土质边坡滑裂面破坏形式——对数螺旋滑裂面。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。