类P-双调和方程的无穷多解问题

考虑了类P-双调和方程△（a（｜△u｜^p）｜△u｜^p-2△u）=f（x，u）的Dirichlet零边值问题的无穷多解问题，这里的非线性项是奇的，通过验证所定义的泛函满足Cerami条件．从而运用喷泉定理，得到了无穷多个大能量解的存在性．     

关于城市维护建设税存在的问题及改进设想

城市维护建设税自开征以来,收入逐年增加。城市维护建设税的开征,对城市的公用事业和公共设施的维护和建设,起了重要的作用。但是,随着我国改革开放的不断深化和经济的不断发展,城市维护建设税本身存在的不足日益显露出来。本文就城市维护建设税所存在的主要问题,谈谈改革的具体设想。     

一类四阶非线性波动方程整体解的存在性

借助线性问题的衰减估计，在一适当的Banach空间，利用整体迭代法证明了一类非线性四阶波动方程Cauchy问题整体解的存在性     

Simple shear endochronic eqiations for finite plastic deformation

The endochronic equations proposed by Valanis (1980) were extended to a finite deformation range. Jaumann's rate,Fu's rate and Wu's rate were incorporated into the endochronic equations to analyze simple shear finite deformation. Incremental equations and numerical solutions are deduced for three endochronic objective models. The results show that an oscillatory shear stress response to a monotonically increasing shear strain occurs when the Jaumann's rate objective model is employed for endochronic materials. The oscillatory response is dependent on the adopted objective rate. Compared with the Jaumann's rate, the Fu's rate and the Wu's rate satisfy the restrictions to elastic-plastic constitutive relations and are in agreement with the experimental results.     

非线性三阶边值问题正解的存在性

利用上、下解方法,研究三阶微分方程解与正解的存在性.然后给出了所获结果的一个应用.     

Unrealistic responses to realistic problems with missing information: what are important barriers?

Abstract

It is a well-documented finding that students tend to neglect their real-world knowledge when solving word problems, even when realistic assumptions are needed. Although studies have successfully shown the extent to which students tend to provide unrealistic responses, the question of where this tendency comes from has yet to be answered. We focused on two major steps needed to solve realistic word problems: noticing missing information and making realistic assumptions. We conducted two studies with fifth graders (Study 1, N?=?108; Study 2, N?=?60) in which we compared students’ (un-)realistic responses to problems that differed in how obvious the missing information was. Study 1 fostered only students’ ability to make assumptions. Study 2 fostered this ability plus the ability to notice missing information. The results indicate that, if the missing information is not obvious, students’ failure to notice it seems to be what prevents them from arriving at a realistic solution.     

电源谐波分析及治理

随着非线性负载的逐渐增加,供电电源的谐波越来越严重,对电网、供电设备和用电设备危害也越来越大。引起了供电部门和用户对谐波的抑制和治理的重视,对UPS电源及其他系统谐波治理应选择合理方案才能取得良好的效果。     

高职高专英语专业学生学习归因研究

该文以鄂州大学英语专业学生英语学习成败归因调查数据为基础,分析了高职学生成败归因的特点,指出不正确归因对今后学习动机的激发和保持的负面影响,并提出了相应的改变错误归因的方法和途径。     

一般指派问题的LINGO解法讨论

一般指派问题是生产管理者在日常工作中经常会遇到的一类问题,它的数学模型是讨论指派n个人完成m项任务的目标最优化。目前,解决指派问题最有效的方法是“匈牙利法”,但此种方法因计算过程比较烦琐、计算量大、容易出错等缺点而未能被推广应用于生产实际。根据指派问题的模型特点,介绍一种简单易行、方便有效的解决此类问题的LINGO解法,以便更好地应用于实际。     

浅析外商在华直接投资的发展与现状

改革开放以来外商在华直接投资取得了长足发展,这对中国民族工业发展、产业结构优化、就业机会及对外贸易增长方面都起到了积极的促进作用.如何扩大利用外商直接投资,本文提出了一定的对策、建议.