CNC系统中任意三维椭圆弧的高速插补新方法

本文根据两步递归插补的思想,导出了任意三维椭圆弧高速插补的公式和算法.它是空间圆弧高速插补方法在三维椭圆弧的情况下进一步推广应用.本文最后还对插补算法进行了稳定性分析和误差分析.     

On parabolic equations with a small parameter

A singularly perturbed parabolic equation with a nonlinear right-hand side of a special form is examined. A numerical analytical study of such equations is performed.     

小型建筑施工企业机械设备维修保养制度探析

小型建筑施工企业建立科学合理的机械设备维修保养制度，是保证工程质量和提高企业经济效益的重要环节。     

Novel methods and universal software for HRXRD, XRR and GISAXS data interpretation

Several novel methods for evaluation and interpretation of X-ray data from modern nanostructures are presented along with their applications. The background of methods and their relations to fundamental problems of X-ray analysis is shortly described. The key features of LEPTOS software, which is designed for the analysis of X-ray data measured with various geometries and setups and implements all discussed techniques, are discussed.     

木材在机械加工中崩茬的控制

在木材的机械加工过程中，崩茬是比较容易出现的制造缺陷，如何有效的控制崩茬问题的出现是非常重要的。本文主要分析崩茬的原因以及平行四边形法则在控制崩茬问题上的应用。     

中小企业ERP实施成因初探

通过对一个中小企业实施ERP的典型案例分析，归纳出了中小企业实施ERP失败的主要原因。并给出了中小企业实施ERP成功的要点。     

Constructing Solutions of an Ill-Posed Nonlinear Singularly Perturbed Problem for an Equation of Elliptic Type

Mathematical Notes -     

On structure of small contractions of odd dimensional projective varieties

Let X be a smooth projective variety of dimension 2k-1 (k≥3) over the complex number field. Assume that fR: X→Y is a small contraction such that every irreducible component Ei of the exceptional locus of fR is a smooth subvariety of dimension k. It is shown that each Ei is isomorphic to the k-dimensional projective space Pk, the k-dimensional hyperquadric surface Qk in Pk 1, or a linear Pk-1-bundle over a smooth curve.     

BEPCⅡ束流相关本底的蒙特卡罗模拟研究(Ⅱ)—束流-气体相互作用

介绍了用蒙特卡罗方法研究正常对撞模式下束流本底中的束流-气体相互作用的原理与效果.使用通用的模拟工具,研究了BEPCⅡ的束流-气体本底对设计中的BESⅢ的影响.结果显示,在储存环上设置挡板后,探测器的本底在允许的范围之内.模拟结果对BEPCⅡ-BESⅢ的设计建造具有指导意义.     

系综分布和它的小涨落近似

由“从正则分布出发，在小涨落近似下得出的能量涨落分布公式”求得的能量涨落的二次矩与直接由正则分布求得的二次矩完全相同，但分别由二求得的高次矩并不完全相同。