Every right-angled triangle with sides of integral length does exist if the length of each leg is a positive integer greater than 2.
以任何大于2的正整数为直角边的整数边直角三角形都存在,且可以通过一定的数学表达式求出其各边边长。
Preventive effect of sharp-edged poly(methyl methacrylate) intraocular lens on posterior capsule opacification;
直角边缘人工晶状体预防兔后囊膜混浊的实验研究
Analyzing on being right angle of space plane angles projection;
投影成直角的空间平面角再分析
The metal of the right angle isnt enough used of hot rolled equal and unequal angle steel Mean while,the right angle is easy producing stress concentration and difficult rolling Therefore,the section of angle steel was optimized,and a new section of round arc angle steel is put forward,which can be easily rolled,used and saved metal material over 5
热轧等边、不等边角钢直角处金属未被充分利用 ,易产生应力集中 ,且轧制难度大 ,因而对其断面进行了优化设计 ,提出一种新型圆弧角钢 ,其轧制容易 ,使用方便 ,可节约金属材料 5 %以
Research on the Mathematical Models of Form and Position Errors for Rotary Surface in Rectangular Coordinates;
直角坐标系下回转表面形位误差数学模型的研究
By introduction of the finite difference method into the Symplectic system of mechanics of elasticity, a Symplectic difference format for plane rectangular coordinates was developed for elasticity problems under stress boundary condition.
将全区域离散的有限差分法引入弹性力学辛体系,建立了应力边界问题的平面直角坐标辛差分格式,用对偶的二类变量进行求解,可直接求得位移和应力。
This paper proposed an assumption on the basis of the operating characteristic of power systems,then made an improvement on Newton-Raphson power flow algorithm in rectangular coordinates.
根据电力系统的运行特点提出假设，继而时直角坐标牛顿－拉夫逊法潮流计算进行改进这种改进方法不但使雅可比矩阵元素的计算量大大减少，而且可提高计算速度、降低对计算机贮存容量的要求为直角坐标牛顿－拉夫逊法潮流计算的使用研究提供了新的依据
A 2-dimensional elasto-plastic finite element model of metal orthogonal cutting was developed based on large deformation-large strain theory,incremental theory and updating Lagrang- ian formulation.
基于大变形一大应变理论、增量理论以及更新拉格朗日算法,建立二维弹塑性金属直角切削有限元模型;采用几何分离准则(距离准则)判断材料的分离,并自动对畸变网格进行重划分;通过用不同的刀具前角对金属直角切削过程进行数值模拟,分析总结结果,得出直角切削过程中在不同切削前角时切削力、刀具与工件的温度、应力应变的分布情况,为选用刀具形状、提高切削表面质量提供了理论依据。