一种新型浇包倾转余留液体积的计算

出于保温性能、安全系数等因素的考虑,铸造车间现行的圆台状钢水浇包将逐步被一种新型浇包(形如两个倒扣在一起的圆台,再加圆柱状嘴)所代替.工程设计中,为了选择合适的电机,需要求出钢包的最大倾转力矩.其中空浇包本身部分易求,故而重点寻求余留液部分,而这里最重要的就是求出体积.本文给出了比较完美的体积公式.     

水环境质量评价的模糊聚类法

将模糊聚类最大矩阵元原理与基于数据迭代为基础的水质模糊评价理论模型相结合，形成模糊聚类迭代方法．并用该方法对甘肃金昌市地下水质进行了分类评价，得到了今人满意的结果．     

一类多元加权最小乖正交多项式

This paper introduces a new notion of weighted least-square orthogonal polynomials in multivariables from the triangular form. Their existence and uniqueness is studied and some methods for their recursive computation are given. As an application, this paper constructs a new family of Pade-type approximates in multi-variables from the triangular form.     

The Existence and Local Behavior of Multivariate Algebraic Function Approximations

The existing scheme of rational polynomial approximants, defined by multivariate power series, is extended to define approximants with branch points. The existence theorem is obtained. The basic properties used to define the rational approximants can be preserved almost intactly. Especially, the local behavior of the     

Anticontrol of chaos for discrete-time fuzzy hyperbolic model with uncertain parameters

This paper proposes a new method to chaotify the discrete-time fuzzy hyperbolic model （DFHM） with uncertain parameters. A simple nonlinear state feedback controller is designed for this purpose. By revised Marotto theorem, it is proven that the chaos generated by this controller satisfies the Li-Yorke definition. An example is presented to demonstrate the effectiveness of the approach.     

河流分类的灰色理论模型

根据灰色关联度的定义，运用加权广义距离构造目标函数，建立了一种灰色综合评判理论模型．应用该模型对辽宁省15条河流进行了综合评价，结果表明该模型分辨率高、可靠性强，并且具有数学推导严谨、科学合理等特点．     

二元二次函数逼近的存在性和局部性

This paper analysis the local behavior of the bivariate quadratic function approximation to a bivariate function which has a given power series expansion about the origin. It is shown that the bivariate quadratic Hermite-Pade form always defines a bivariate quadratic function and that this function is analytic in a neighborhood of the origin.     

On the Method of Multiplier-enlargement and Approximation of Unbounded Continuous Functions

Ａｓｉｓｋｎｏｗｎ ,ｉｔｉｓｖｅｒｙｉｍｐｏｒｔａｎｔｔｏａｐｐｒｏｘｉｍａｔｅｕｎｂｏｕｎｄｅｄｃｏｎｔｉｎｕｏｕｓｆｕｎｃｔｉｏｎｓ,ｅｓｐｅｃｉａｌｌｙｔｈｏｓｅｄｅｆｉｎｅｄｏｎａｌａｒｇｅｒａｎｇｅ .Ａｎｅｆｆｅｃｔｉｖｅｍｅｔｈｏｄｃａｌｌｅｄｔｈｅｍｅｔｈｏｄｏｆｍｕｌｔｉｐｌｉｅｒ ｅｎｌａｒｇｅｍｅｎｔｈａｓｂｅｅｎｐｕｔｆｏｒｗａｒｄｂｙＬ .Ｃ .ＨｓｕａｎｄＲ .Ｈ .Ｗａｎｇ[1— 3].Ｔｈｉｓｍｅｔｈｏｄｗａｓｇｒｅａｔｌｙｄｅｖｅｌｏｐｅｄｉｎ [4,5] .Ｉｎｔｈｉｓｐａｐｅｒ,ｗｅ…     

非对角二元二次函数逼近的存在性和局部性质

§ 1　IntroductionThis paper is concerned with the properties of the simple off-diagonal bivariatequadratic Hermite-Padé approximation.Thisapproximation may be defined asfollows(see,for example,[1 ] ) .Let f(x,y) be a bivariate function,analytic in some neighbourhood of the origin(0 ,0 ) ,whose series expansion about the origin is known.Let a0 (x,y) ,a1 (x,y) ,a2 (x,y) bebivariate polynomials,a0 (x,y) = ki,j=0 a(0 )ij xiyj,a1 (x,y) = ni,j=0 a(1 )ij xiyj,a2 (x,y) = mi,j=0 a(2 )ij xiyj,such th…     

ON A FAMILY OF MULTIVARIATE LEAST-SQUARES ORTHOGONAL POLYNOMIALS

In this paper the new notion of multivariate least-squares orthogonal polynomials from the rectangular form is introduced. Their existence and uniqueness is studied and some methods for their recursive computation are given. As an application, a new family of multivariate Pade-type approximants from the rectangular form is constructed.