对角型抛物组解的有界性

在2n/n+2≤P<2情形,证明对角型抛物组(0.1)的解的有界性。     

一类含离散时滞的细胞动力学模型的渐近性

本文在Martin Eisen的二房室增长模型中引入离散时滞,利用离散时滞稳定性理论,证明了平衡点的渐近稳定性。     

Do flexible admission systems affect student enrollment? Evidence from UK universities

We reveal the current level of flexible admission systems (FAS) at UK universities, and explore its impact on student enrollment rates. We employ quantitative analysis techniques for data collected and customized from the Higher Education Statistics Agency (HESA) in the UK, during the period 2010–2015. To understand the impact of FAS on student enrollment, six statistical tests were conducted. Based on the level of FAS adopted by universities, we identified four groups of UK universities: very low, low, medium, and high levels of FAS. No robust evidence exists to support claims that universities which apply a higher level of FAS have higher student enrollment. The study results were based only on secondary data collected from HESA, so future studies should be based on other types of data. This paper attempts to cover the missing elements of previous literature and its traditional research techniques.     

Is there a role for educational psychologists in facilitating managed moves?

The current research aimed to explore the extent to which school professionals and local authority staff perceived that there was a role for educational psychologists in the processes involved in implementing, monitoring and offering support to young people for whom a managed move was being arranged. The study was conducted in one English local authority where 11 school staff and five local authority staff were interviewed using a thematic analysis methodology. The emerging themes were: lack of role clarity; variability between schools; reactiveness in relation to crisis; capacity; and possibilities for further involvement including transition, preventative work and accurate assessment of needs.     

Delay-dependent robust H∞ control for a class of uncertain switched systems with time delay

For linear switched system with both parameter uncertainties and time delay,a delay-dependent sufficient condition for the existence of a new robust H∞ feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm.Compared with the conventional state-feedback controller,the proposed controller can achieve better robust control performance since the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed synchronously with the dynamical characteristic of the system.This design method was also extended to the case where only delayed state is available for the controller.The example of balancing an inverted pendulum on a cart demonstrates the effectiveness and applicability of the proposed design methods.     

A narrative across 28 years in academic development

ABSTRACT

This paper is a narrative across 28 years in academic development. Four phases are described, showing how initially naïve conceptions about academic development have been addressed, enabling a growth towards a more holistic understanding of how diversity, quality assurance, and community networks can productively interface. This narrative will, hopefully, assist reflection by other academic developers.     

具有弱奇异核的非线性积分微分方程的FEM估计(英文)

本文用线性有限元方法逼近一般的拟线性抛物积分微分方程,该方程带有一个记忆项含有一个弱奇异核,在解的正则性最少的假设下,证明了半离散解存在和L∞最优阶收敛。证明的基本工具是格林函数方法。     

A question–answer system for mobile devices in lecture-based instruction: a qualitative analysis of student engagement and learning

The aim of this study was to explore the opinions, perceptions and evaluations of students about their experiences with a question–answer system used on mobile devices in a lecture-based course. Basic qualitative research method was employed in this study to understand how students made sense of their experiences during the instruction. The participants of the study were 25 of 42 students enrolled in a Computer Hardware course, who were interviewed in five sessions of focus-groups. Data analysis was done based on the six steps of inductive analysis. The results showed that students mostly ascribed the meaning of their engagement to the observable behaviors about academic challenge. Concerning inhibiting factors for participating in a lecture, they stressed the constraints of lecture method. As inhibiting factors for asking questions, they mostly stated shyness as a reason. The results of the research were discussed reflectively to investigate the constructed meanings of participants about the context and to make suggestions for further studies.     

二维抛物型方程非齐次边值问题的高精度差分格式

针对二维非齐次抛物型方程提出了高精度紧致差分格式，本文将把在[2]中二维问题的差分格式在空间方向上提高到四阶，对其进行了收敛性分析，证明其收敛阶为o（△t^2＋hx^4＋hy^4），并采用ADI算法将二维问题降为一阶求解。     

Existence and uniqueness theorem for flow and heat transfer of a non-Newtonian fluid over a stretching sheet

Analysis is carried out to study the existence, uniqueness and behavior of exact solutions of the fourth order nonlinear coupled ordinary differential equations arising in the flow and heat transfer of a viscoelastic, electrically conducting fluid past a continuously stretching sheet. The ranges of the parametric values are obtained for which the system has a unique pair of solutions, a double pair of solutions and infinitely many solutions.