斯图姆-刘维尔问题的特征值的一种算法

1.引言设(a,b) cR是一个有界开区间,考虑如下的斯图姆一刘维尔问题(尸(二)丫)‘了(6)+叮(x)y二几s(、)了 二O(1 .1) 了口、、 一yrjee‘的特征值的近似计算,其中尸(x)任C,([a,bl),,(x),s(x)eC([。,6]),且满足 产1,蕊尹(x)〔产。(22) 产2:‘叮(x)‘产二(1 .3) 产3,蕊:(x)岌产二(1 .4)其中O<闪,成两2,o感脚,簇产二,。<脚;蕊产二。 在文〔1」中所给出的方法比差分方法好)但只能计算第一特征的近似值,计算量又较大。在本文中,我们利用Galerkin方法计算斯图姆一刘维尔问题的特征值的近似值。在文【l]中的问题是本文的特例,即q(万)二o,,(二)二1…     

信息技术与算法思想在研究性学习中的渗透

20世纪下半叶,信息技术革命给数学带来了无限的生机。由此数学的发展从第三个高峰时期:希尔伯特的形式主义(严密的公理化)进入了第四个高峰时期:计算机时代的问题解决(纯粹数学与应用数学的新交融)。这些伟大数学成就的核心观念,都将与时俱进地、适当地、相对完整地反映到新的《高中数学课程标准》中。并在内容上,将突出计算机算法在整个数学发展中的独特作用,力求把计算机算法融入到数学课程的各个相关部分。     

简析一道溶解度曲线应用题

A、B两种固体的溶解度曲线如图所示．在40℃时，烧杯中盛有A、B两种溶质的混合溶液，且杯底有少量A、B固体，今令其冷至20℃，下列说法中正确的是( )     

论社会主义初级阶段的混合所有制经济

根据党的十五大以来有关社会主义初级阶段基本经济制度的重要阐述,我国应从所有制结构、分配制度和经济运行机制等三个方面做进一步的调整、变革和创新。     

一种改进的神经网络算法在销售预测中的应用

本文针对传统神经网络算法的不足之处给出了一种改进算法，且将该算法应用于销售预测中，获得了良好的预测结果，可作为预测商品销售的一种手段。     

全章目录学辨

Quan Zuwang and Zhang Xuecheng were both bibliognosts of Qing Dynasty. In Quan s theory of bibliography, there is neither the connotation of enlightenment thought nor the ideological content of, what is called the Yi Wen Xue An in Zhang s bibliographical thinking, which, together with his literary and historical thinking has reciprocal outward show and inner thought. He had founded the theory of new bibliography and developed a school of his own. It s true that his theory carries on the theories of his predecessors and those of the same generation of him,but it is by no means the product of "being very close"to any of theirs.     

图书馆要主动为读者服务

The formulations "All for the readers" and "Readers, the Supreme" highly summarize the meaning of serving the readers whole-heartly. To take the initiative to serve the readers is to bring into full play the librarians subjective initiative to find out of his own accord the readers opinions and demands and in all earnestness combined with a matter-of-fact and scientific analytical attitude to create unceasingly the way to serve readers and an administrative mechanism, both of which accord with the objective law.     

联机公共检索目录系统的发展

Since the development of the Online Public Access Catalogues in the 1970s, libraries in Europe and America have devoted more and more attention to it. To date, it has already developed to the third generation. The OPAC System makes those users who lack training and experience be able to use it directly. It provides the users a kind of capability to access, which is neither like the order language with a very complex function, nor is it like the "menu" one with a very simple function. The interface design of it is an important phase of OPAC device,the study of which falls into the following categories;1)the matching aid.2)the retrieval aid.and 3)the semantic/contextual aid.The successful practice of the development and services of OPAC opens up a wide range of prospect for readers to use library materials directly.     

信息检索与循证医学关联教学的实证研究

将循证医学理念引入医学信息检索教学,探寻两者有效结合的教学模式,为提升学生的信息素养与临床循证能力提供借鉴与参考。采用实证研究的方法,以本校专业学位研究生为研究对象,在剖析循证医学—元素养—医学信息检索的内涵及关联关系基础上,明确教学理念,开展教学设计与教学实践。构建的“一体多维”教学模式,促进了自主学习与探究式学习有效结合,确实有效地增强了学生的循证意识,提升了学生的信息素养与循证能力,达到较良好的教学效果。