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Considering the effect of load and helical angle on the instaneous width of contact area, this paper uses the BEM program for calculating the deformations at different place along the width of convex tooth and concave tooth of W-N gear and gets the relevant deformation curves.

并首次应用三维边界元方法,在计入齿面瞬时接触迹宽度随外载、螺旋角而变化的条件下,计算了双圆弧齿轮凸齿面端部和凹齿面端部的变形。

The influences of reservoir pressure and pulse duration on instantaneous velocity are investigated.

在由 3根陶瓷滤管组成的实验装置上,利用热线风速仪对脉冲反吹时滤管外瞬态流场进行了测定,分析了喷吹压力和脉冲宽度对滤管外流场的影响。

The width of an item always represents its cost; the height is its number of votes, and the area under the curve, or integral, is the money offered to an item.

宽度1项目始终代表其成本;的高度是其票数和曲线下面积,或整体,是提供资金的项目。

Integral geometry is applied here to picture analysis and recognition.

本文应用积分几何于图象分析与识别之中,引进了Crofton整体参量和方向参量C, CD/J其中,D——广义方向直径,J为方向投影宽度,提出了一种称之为Crofton字符几何识别方案。

The radiographs were transferred into a computer and calibrated and measured with the image J software. The following factors were measured : [1] the distance from the base of the contact point to the bone crest. [2] The length of the interproximal dental papilla. [3] The width of keratinized gingiva. [4] The interdental distance.

使用测量软体计算距离,并评估下列各项影响齿间乳突存在与否的因子,包括:[1]牙齿接触点到齿槽骨嵴的距离;[2]齿间乳突的长度;[3]齿间角化牙龈的宽度;[4]牙齿间距。

Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验,运用工艺实验和理论分析相结合的方法,重点做了以下工作:(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因,并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理;(2)以混合硅粉的电火花加工为例,实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律,并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据;(3)在实际加工中,由于粉末的加入使放电间隙变大,这使得混粉电火花加工的尺寸精度难以控制,本文利用三元线性回归的方法,在实验数据的基础上,建立了两种电火花加工过切量的计算公式;(4)将正交试验法应用于混粉电火花加工实验研究,并通过对实验指标极差的直观分析,得出各电参数对加工指标影响的敏感程度。

It is revealed that temperature is the dominant factor that determines morphologies of phase domains and interfacial width.

模拟结果表明温度是决定相区形态和界面宽度的主要因素。

After introducing to the inner structure and the driver timing of a interline area-CCD KAI-1010M briefly,a high speed and low cost CCD driver circuit used in digital space survey camera was designed in a new way.

介绍了行间转移面阵CCD芯片KAI-1010M的内部结构和驱动时序,采用新方法和低成本器件设计了该CCD芯片的驱动电路,把电源和电机控制的脉冲宽度调制技术引入CCD驱动电路,采用超高速运放驱动高速负压信号以减小其上升沿和下降沿时间,达到高速低成本驱动要求,解决了驱动设计中的技术难点。

Cluster analysis and principal component analysis of the physical characters of 23 populations in China with 13 measurements, including maximum head length, maximum head breadth, minimum frontal breadth, bizygomatic breadth, morphological facial heigth, nose breadth, nose heigth, mouth breadth, interocular breadth, stature, sitting height, breadth of shoulder and distance between iliac crests are made.

作者选取13项指标(头长、头宽、额最小宽、面宽、形态面高、鼻宽、鼻高、口裂宽、两眼内宽、身高、坐高、肩宽、骨盆宽)对我国23个群体体质特征进行了聚类分析与主成分分析。研究结果显示:23个群体可分为南方组、北方组和中间类群组。南方组与北方组的体质区别主要为体部的长度、宽度的差异。

Beach width, hydrodynamic conditions and the size of effective upshore intertidal area.

域的滩涂宽度、水动力条件以及有效潮上坪面积等。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。