共查询到20条相似文献,搜索用时 125 毫秒
1.
再谈三角形的周界中线 总被引:2,自引:0,他引:2
再谈三角形的周界中线戎健君,刘渊(江苏丹阳市教研室212300)(南京无线电工业学校)文[1]介绍了三角形的周界中线、界心及其性质,读后颇受启发,现在我们再来介绍周界中线,界心的另一些有趣性质.定理1三角形的界心、重心、内心三心共线,且界心到重心的距... 相似文献
2.
3.
文[1]提到了圆锥曲线的极点和极线,文[2]研究了与圆锥曲线极点和极线有关的几个性质,笔者受此启发,在解题中发现了一个与圆锥曲线极点和极线有关的一个等角性质,现叙述如下. 相似文献
4.
与圆锥曲线极点和极线有关的几个性质 总被引:1,自引:1,他引:0
文[1]提到了圆锥曲线的极点和极线,文[2]研究了圆锥曲线极线上任一点的一个有趣性质,笔者受此启发,经过研究,发现了几个与圆锥曲线的极点和极线有关的性质,并根据这些性质的推论可得到用尺规法作过圆锥曲线上一点的切线的一种方法,现叙述如下,供同行参考. 相似文献
5.
6.
本对一类广义Kuramoto-Sivashisky型方程证明了惯性流形的存在性,并对其维数作了估计同时研究了该方程的不变锥性质和轨线的强挤压性。 相似文献
7.
关于C0半群的渐近稳定性 总被引:1,自引:0,他引:1
研究Banach空间上等距C0群的性质,据此讨论了C0半群的渐近稳定性和C0半群完全轨线的存在性.在文章的最后,回答了黄发伦提出的一个关于渐近稳定性的猜测. 相似文献
8.
文[1]系统研究了双圆四边形的性质,并于文末提出了双圆四边形中十点共线的猜想.杨之先生在著作[2]中将此猜想列为whc32.黄汉生、刘素莲在文[3]中研究了这一问题.他们用解析几何方法,得出了其中八点在一直线上,两点不在这一直线上的结论.文中点E2坐... 相似文献
9.
王春杰 《数学物理学报(A辑)》1998,18(3):297-301
设s(c)为双纽线|W^2+C|=1的弧长,c∈「0,+∞),该文讨论了s(c)的性质,并在n=2的情况下解决了Erdos,Herzogt Piranian提出的一个猜测。 相似文献
10.
11.
A conventional problem of paper handling in a page-printing printer is to design a reliable paper path. Sometimes, this also affects the printing quality. The nonlinear theory of elastica has often been used to model paper deflection shape and to predict the paper path between some guiding rollers. The present paper proposes another method that can solve this problem more efficiently. Considering a piece of paper as a nonlinear beam, finite element analysis with geometric nonlinearity and manipulating the contact gap element between paper and guiding surfaces can be used to simulate the large-deflection behavior of paper. In this paper, the paper path in the vicinity of an OPC (organic photoconductive) drum is investigated with a general purpose finite element package. The effect of the electrostatic force between the OPC drum and the paper is considered, and the deformed shape of the paper for different forces lengths is obtained. According to those results an appropriate paper guide is added for an exact paper path. 相似文献
12.
This paper starts with a biographical sketch of the life of Josef Meixner. Then his motivations to work on orthogonal polynomials and special functions are reviewed. Meixner’s 1934 paper introducing the Meixner and Meixner–Pollaczek polynomials is discussed in detail. Truksa’s forgotten 1931 paper, which already contains the Meixner polynomials, is mentioned. The paper ends with a survey of the reception of Meixner’s 1934 paper. 相似文献
13.
本文首先提出了投资收益相依性的风险模型并给出了其风险模型的破产概率,并且讨论了在双项投资的情况下如何合理分配使得保险公司取得最佳经营.最后给出在多项投资情况下的分配方案. 相似文献
14.
S. S. Antman 《Journal of Nonlinear Science》1996,6(1):1-18
Summary This paper surveys recent results and open problems for the equations of motion for geometrically exact theories of nonlinearly
viscoelastic and elastic rods. These rods can deform in space by undergoing not only flexure and torsion, but also extension
and shear. The paper begins with a derivation of the governing equations, which for viscoelastic rods form a quasilinear system
of hyperbolic-parabolic partial differential equations of high order. It then derives the energy equation and discusses difficulties
that can arise in getting useful energy estimates. The paper next treats constitutive assumptions precluding total compression.
The paper then discusses the curious asymptotic problems that arise when the inertia of the rod is small relative to that
of a rigid body attached to its end. The paper concludes with discussions of traveling waves and shock structure, Hopf bifurcation
problems, and problems of control.
This paper is dedicated to the memory of Juan C. Simo
This paper was solicited by the editors to be part of a volume dedicated to the memory of Juan Simo. 相似文献
15.
R.G. Coyle 《European Journal of Operational Research》1978,2(2):86-96
This paper describes a practical system dynamics case study. It attempts to show how this OR technique can be applied to a practical problem and the results which it can, and cannot, be expected to give.Although the paper is based on a real project, the details have been altered for commercial secrecy, and the emphasis in this paper is, for the same reason, rather different from that of the original work. The aim of the paper is, therefore, to give enough of a “real” background to contrast the industrial application of SD with some of its other applications.For the sake of reasonable brevity, the emphasis in this paper is on the managerial viewpoint, and the extent to which an SD model provides helpful answers to managerial questions. The model paper is described only briefly as full details, and a model listing are given by Coyle. Some other aspects of the system are treated by Winch. 相似文献
16.
In this short paper I report on a paper published in Nonlinear Analysis: Real World Applications in 2004. There is a major mistake early in that paper which makes most of its claims false. The class of reaction–diffusion systems considered in the paper has been the object of a renewed investigation in the past few years, by myself and others, and recent discoveries provide explicit counter-examples. 相似文献
17.
T. R. Faulkner 《International Journal of Mathematical Education in Science & Technology》2013,44(2):167-174
The paper is an account of the experience of introducing a multiple choice mathematics examination paper for the first year engineering mathematics course at Nottingham University. The form of the paper is described, as is a system for providing the candidates with feedback on their performance without the publication of the examination paper. 相似文献
18.
In this paper, we refine and improve the results established in a 2003 paper by Deng in a number of directions. Specifically,
we establish a well-posedness result for convex vector optimization problems under a condition which is weaker than that used
in the paper. Among other things, we also obtain a characterization of well-posedness in terms of Hausdorff distance of associated
sets. 相似文献
19.
This paper considers a heat system with localized sources and local couplings subject to null Dirichlet boundary conditions,
for which both total and single point blow-up are possible. The aim of the paper is to identify the total and single point
blow-up via a complete classification for all the nonlinear parameters in the model. As preliminaries of the paper, simultaneous
versus non-simultaneous blow-up of solutions is involved, too. The results are then compared with those for another kind of
heat system coupled via localized sources in a previous paper of the authors. 相似文献
20.
《European Journal of Operational Research》1998,104(3):572-581
In this paper a two-dimensional trim-loss problem connected to the paper-converting industry is considered. The problem is to produce a set of product paper rolls from larger raw paper rolls such that the cost for waste and the cutting time is minimized. The problem is generally non-convex due to a bilinear objective function and some bilinear constraints, which give rise to difficulties in finding efficient numerical procedures for the solution. The problem can, however, be solved as a two-step procedure, where the latter step is a mixed integer linear programming (MILP) problem. In the present formulation, both the width and length of the raw paper rolls as well as the lengths of the product paper rolls are considered variables. All feasible cutting patterns are included in the problem and global optimal cutting patterns are obtained as the solution from the corresponding MILP problem. A numerical example is included to illustrate the proposed procedure. 相似文献