关于颞部骨块形成模型的极限环问题

考虑颞部骨块形态形成过程中抑制度的变化不仅与激活度的平方成正比,而且与激活度本身的浓度成正比,对Gierer-Meinhardt给出的颞部骨块形态形成过程的基本模型进行改进,利用常微分方程定性理论研究了颞部骨块的形态形成模型平衡点的性态,并得到该系统的极限环的存在性和极限环的唯一性的条件。     

首次积分与极限集的关系

利用奇点和有限集的特征，给出了首次积分存在的某些条件，首次积分可用来判别奇点，在各种奇点分布的情况下，利用向量场同胚映射证明了非奇点极限集的存在性。     

Mechanism of craquelure pattern formation on panel paintings

The drying shrinkage accumulation from exposure of freshly prepared gesso layers to relative humidity (RH) cycles was determined to elucidate the mechanism of craquelure pattern formation on panel paintings. The progresive drying shrinkage of the gesso is observed only under the cycles going to high RH levels which bring about transitions from brittle to ductile state of the material. The first incidence of fracture on the gesso layers occurred after a limited number of cycles ranging between a few and 100 for a range of layer thickness between 0.5 and 1?mm. The craquelure patterns stabilised also after a limited number of cycles (30 for the 1-mm thick layer). Upon increase in the gesso layer thickness, the strength of the layer is reduced and the spacing of shrinkage fractures increases. The study demonstrated that craquelure patterns, mimicking historical ones, can be realistically produced in laboratory conditions. Such studies would provide useful information for preparing specimens simulating historic panel paintings and would inform the current efforts on automatic, computer-aided classifications of crack formations on paintings.     

图{C_4,C_6}对K_(1,n)的二部Ramsey数

给出了二部Ramsey数br({C4,C6},K1,n)的上界为n+n1/3+2/3+O[n-1/3],特别地,对任意素数q,给出了等式br({C4,C6},K1,q3-q+1)=q3+1的结果。     

一类E3^1系统的奇点分析

研究一类平面E3^1系统奇点问题,以及当b1〈0且系统有三个有限远奇点时,我们分析了两个焦结点之间的变化联系.     

一类线性系统在11次扰动下的极限环分支

利用判定函数法研究了一类线性系统在11次扰动下的极限环分支,证明了这类系统至多产生5个极限环,并给出了正好产生5个极限环的条件,最后给出了一个能产生五个极限环的具体例子。     

Evaluating the non-academic impact of academic research: design considerations

Evaluation of academic research plays a significant role in government efforts to steer public universities. The scope of such evaluation is now being extended to include the ‘relevance’ or ‘impact’ of academic research outside the academy. We address how evaluation of non-academic research impact can promote more such impact without undermining academic freedom and research excellence. Five questions on evaluation design are considered: (1) What should be the object of measurement? (2) What should be the timeframe? (3) How should non-academic users of research inform evaluation processes? (4) How should controversial impacts be managed? (5) When in funding cycles should impact evaluation occur? We conclude that non-academic impact should be selectively promoted and evaluated. This is how greater gains from research might be best captured without imposing misguided and onerous reporting requirements on individuals and institutions.     

pm阶循环群的自同构群的具体刻画

根据p~m阶循环群的自同构群的理论,设计出p~m阶循环群之自同构群的生成算法,给出了任一p~m阶循环群的自同构群的具体刻画.     

Precision and Craft in Whitehead's Educational Philosophy

In this paper, the intimate relationship between experience and learning in the cycle of precision is elaborated. I believe this relationship is the foundation of Whitehead's account of the pedagogical relationship, which has intrinsic value, because this understanding is valuable in itself, and is particularly valuable for me as an educator. Whitehead's view is most clearly exemplified in his account of technical education where aesthetic appreciation is its aim just as bodily feelings are its organic foundation.     

Naturalism and Educational Administration: New directions

Abstract

The purpose of this paper is to outline some new developments in a mature research program that sees administrative theory as cohering with natural science and uses a coherence theory of epistemic justification to shape the content and structure of administrative theory. Three main developments are discussed. First, the paper shows how to deal with the evaluation of theories (of, say, leadership) where there is a demand that a theory needs to be context relevant, but also comprehensive. The solution is to allow context to determine the scope of comprehensiveness. Second, the paper develops an argument structure employing a coherentist epistemology for how ethical claims can be incorporated into administrative theories. Finally, the paper, drawing on research in neuroscience, argues for the relevance of emotion in rational decision-making. Contrary to the belief that emotion compromises rationality, the paper argues that it is essential for rationality.