两种电磁场边界条件推导之比较

在对电力，电子、微波、通讯等专业的学习中，对电磁场的分析是一个非常重要的部分．它不仅要求对该条件的知识有个全面的了解，而且也要求熟练应用麦克斯韦方程推导相应的边界条件，而另外一种切实可行的方法则是应用斯托克原理及麦克斯韦方程进行综合分析，并且可将过程一定的简化。     

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.     

双解析函数在敞开曲线上的Riemann边值问题

研究双解析函数在光滑敞开曲线上的Riemann边值问题 利用解析函数Riemann边值问题的标准函数和特征双解析函数的Plemelj公式 ,得到了问题 (R)一般解的表示式 ,建立了问题 (R)的线性无关的个数与指标之间的关系     

西部大开发与边疆民族地区高校发展战略选择

在实施西部大开发和高等教育大众化等有利背景条件下,边疆民族地区高校在发展战略的选择上,应重视和优先考虑以下方面,如抢抓机遇、服务西部、特色兴校、多元筹资、加强师资队伍建设等,以促进自身的超常规发展。     

ANALYSIS OF MICROWAVE N-PORT NETWORK BY A MODIFIED BOUNDARY ELEMENT METHOD

A new approach based on resonance technique and modified boundary ele-ment method is presented to calculate the impedance parameter matrix of a microwaveN-port network of waveguide structure.A two port network is taken as a numerical ex-ample and the results show that the approach occupys the advantages of high accuracyand less computation effort.     

奇性二阶微分方程边值问题的微分不等式

研究奇异性二阶微分方程的边值问题 ,通过构造上下解 ,并利用Nagumo的思想和截断函数的技巧 ,得到了解的存在性及微分不等式 .     

一类三阶微分方程的n点边值问题

研究如下形式的三阶微分方程的n点边值问题{y′′′=f（t,y,y′,y″）,a〈t〈b y（a）=A,y′（a）=B,h[y′（t1）,y′（t2）,…y′（tn-2）,y′（b）]=0的微分不等式与解的存在性,这里a〈t1〈t2〈…〈tn-2〈b.然后利用所得到的结果，研究带有正的小参数ε的n点边镇问题{εy′′′=f（t,y,y′,ε）y″＋g（t,y,y′,ε）,a〈t〈b y（a）=A,y′（a）=B,y′（b）-^N-2∑i=1piy′（ti）=c的奇异摄动，这里常数P1，P2，…，pn-2〉0．     

Structural marginalisation,othering and casual relief teacher subjectivities

Produced through market relations of neoliberal managerialism, teacher subjectivities are becoming progressively commodified. With the increasing casualisation of the teaching workforce, the well-being and status of casual relief teachers (CRTs) can be seen as an area of concern, at risk of ‘flexploitation’. More than just a convenient labour pool, CRTs operate on the margins of school communities, a space fraught with a range of issues. In many instances, CRTs experience less job satisfaction; less rapport with students and colleagues and less access to school information, professional development, resources and teaching materials. This article draws on a positioning theory to frame the discursive production of CRT selves within the neoliberal milieu. It offers a detailed analysis of collective biographies that explore narrative formations of casual teaching. Schooling discourse is replete with metaphorical language that frames teacher positioning, and a range of existing metaphors in CRT literature highlight their vulnerability in particular. Rather than offering an analysis that addresses casual teacher performance as a problem to be solved, this article proposes that the relationship between ‘structural marginalisation and the ‘othering’ that CRTs can experience is associated with the politics of market-related performativity.     

Researching ‘messy objects’: how can boundary objects strengthen the analytical pursuit of an actor-network theory study?

ABSTRACT

This paper offers a detailed consideration of how the theoretical scope of the boundary object concept fits within an actor-network theory (ANT) sensibility when researching ‘messy objects’. Messy objects are artefacts whose relational effects are inherently slippery and complex. As the aim of ANT is to show how non-human and human actors are co-constitutive in performing social activity, the uptake of boundary objects in ANT studies may appear to be an expedient analytical endeavour. However, scholars have raised concerns that the boundary object concept has lost some of its original analytical bearing, and that it is theoretically incompatible with ANT. This paper argues that a more careful reading of boundary objects’ conceptual origins can provide useful insights for an ANT study. To illustrate this argument, findings are presented from an ethnographic study of engineers’ knowledge practices in an emerging industry. Specifically, it shows that when a messy object – a signature on a contract – is foregrounded as a boundary object, particular knowledge practices are made visible. However, due to the complexity and messiness of the signature’s performance, this paper contends that a pluralist theoretical approach to analysing messy objects may be more helpful to address issues of professional practice and knowledge.     

一类非线性双曲型方程的初边值问题

讨论了方程uu=uxxt σ（ux）x的混合初边值问题第二边值问题，用Galerkin方法和紧性方法得到问题的整体广义解和整体古典解的存在性与唯一性。