Abstract : this paper puts out the edge shapes curvilinear equations , of the edge shapes of double circular gear hob , and analyzes the tooth surface ' s characterist . it also points out that the gear hob is a kind of approximate shape building cutting too ls in the whole course of using 文摘:本文提出了直槽双圆弧齿轮滚刀刃形曲线方程式，并进一步分析了该滚刀的齿面特性，指出该滚刀从整个使用过程看，是一种近似造型的刀具。
As a member of the ethical , legal and social implications working group advising the agencies on human genome research , duster urged the nih and the department of energy to challenge the bell curve , the 1994 best - seller that argued that race correlated with intelligence 达斯特身为伦理、法律与社会涵意工作小组的一员，负责督导人类基因组研究；该小组要求美国国家卫生研究院与能源部质疑1994年的畅销书《钟形曲线》 ，因为该书主张智力与种族有关。
Main works : fractal and mechanism of forming fractal of fault surface in rock masses is analyzed and examined with it ' s affect on failure process of mining rock masses ; fractal curves are constructed with matlab to simulate the fault surface . similar material modeling is carried out and the fractal weak - face effect of mining rock masses is studied . mechanics character of rock masses with fractal fault in mining condition is simulated with large finite element software an sys ; catastrophe model of fault activated by mining is constructed with catastrophe theory 主要工作有：检测和分析了岩体断层面的分形性和断层面分形的形成机制及其对采动岩体破坏的影响机理；运用matlab构造了分形曲线来模拟分形断层面，进行了相似材料模拟实验，研究了采动岩体的分形弱面效应；采用大型有限元软件ansys模拟了含有分形断层面的岩体在采动条件下的力学性态；运用突变理论建立了采动断层活化的突变模型。
In the aspect of ship maneuvering hydrodynamics , taking bulk carriers and oil tankers for an example , the prediction was done ; in the turning circle , different ships under different rudder angles were studied and predicted ; in the zigzag curve , different ships under constant rudder angle were studied to predict another two ships 在操纵运动水动力方面，以散货船和油船为例探讨应用bp网络完成水动力的学习和预报；在回转圈方面，完成了不同船舶在不同舵角下的学习和预报；在z形曲线方面，对不同的船舶在同一舵角下进行学习，预报了另外两艘船舶的z形曲线。
In this paper , on basis of the current machining state , a testing principle on aspheric surface is put forward to , the principle is a kind of touching method by testing the meridian of aspheric surface and comparing it with the theoretical curve , so surface figure error is got . according to this principle , mechanical structure is designed and electric - control system is researched 本文首先基于现阶段非球面的加工状况，提出了用接触式检测非球面的子午面面形曲线并与理论曲线相比较，从而得到非球面面形误差的检测原理，并根据该原理进行了机械结构的总体设计和电控系统的研究。
For the regular curves , we find two killing fields for the purpose of integrating the structural equations of the p - elastic curves and express the p - elastica by quadratures in a system of cylindrical coordinates . for the star - like affine curves , we solve the euler - lagrange equation by quadratures and reduced the higher order structure equation to a first order linear system by using killing field and the classification of linear lie algebra sl ( 2 , r ) , sl ( 3 , r ) and sl ( 4 , r ) . we solve the centroaffine p - elastica completely by quadratures 对于正则曲线的情形，我们发现了两个用于求解p -弹性曲线的结构方程的killing向量场并用积分将p -弹性曲线在一个柱面坐标系中表示出来，而对仿射星形曲线的情形，我们用积分方法解出了欧拉-拉格朗日方程，利用killing向量场及线性李代数s1 ( 2 ， r ) 、 s1 ( 3 ， r )和s1 ( 4 ， r )的分类将高阶结构方程降为一阶线性方程，因此我们用积分完全解出了中心仿射p -弹性曲线。
We find that state - owned equity is negatively related to corporate diversification , that corporate equity is related to diversification in inversed " u " pattern , that tradable equity is negatively related to diversification , that equity concentration , institution equity percentage and management equity percentage are negatively related to diversification 我们发现，国有股权与公司多元化程度呈现负相关关系，法人股与多元化程度呈倒u形曲线关系，流通股与多元化程度呈正比例关系；股权集中度、机构持股比例和管理层持股与多元化程度呈负相关关系。
With the 300mw turbo - generator as an example , the effects of saturation on operational characteristics and the stator and rotor ' s practical dimensions and configuration on the saturated characteristics have been studied ; some work on the grid division strategy considering the practical dimensions and configuration and the precision of the nonlinear finite element equation also has been studied . then the program for calculating and analyzing turbo - generaors " steady characteristics has been compiled and devised 本文在系统地研究了汽轮发电机运行特性（饱和特性、短路特性、零功率因数负载特性和u形曲线） 、非线性有限元方程计算精度、定转子实际结构对饱和特性的影响及计及定转子实际结构时的剖分策略等问题之后，进一步研究开发了适于不同型号汽轮发电机稳态分析的通用性有限元软件。
Based on experimental research on electrical property of waterflooded rock we have found that variation of salinity has much effect on rock resistivity , and it makes that relation curves of complex resistivity and in - phase resistivity of rock under single frequency with water saturation are characteristic of u - style curve , just like relation curves of waterflooded rock resisitivity with water saturation , but salinity variation has little effect on rock dispersion property 摘要通过水淹岩石岩电特性的实验研究发现，地层水矿化度的变化，对岩石电阻率幅值的影响较大，致使单一频率下的岩石复电阻率幅值和同相电阻率也会象常规电阻率一样，随着含水饱和度的变化，出现" u "形曲线，而相对而言，地层水矿化度对岩石频散特性的影响较小。
