《家具设计》课程教学模式的研究与改革探讨

分析了现行家具设计的教学模式及其存在的问题,提出在教学中应注意课程体系的针对性,强调基础果教学的适应性、专业课教学的实用性以及专业课程教学的合理性和连续性等问题.     

一类随机过程之和的收敛性

研究了随机过程之和的收敛性问题,给出了ηn(t,w)=1/bn∑ from k=1 to n akξk(t,w)依联合测度μ×P收敛于0的一个充分条件;若{‖ξn(t,w)‖}有界,证明了ηn(t,w)=∑from k=1 to n (ak/bk)ξk(t,w)依联合测度μ×P收敛于某一个随机过程η(t,w).     

函数的连续性

介绍了函数的连续性的三种等价定义，并对它们之间的等价关系进行了互相证明，使人们更加深入地了解函数的连续性。     

公民的同一性危机与防范

从个体性、整体性和整合性、一致性和连续性以及社会团结性四个方面的缺失来分析公民的同一性危机。认为应从个人、家庭和社会三个方面来预防和解决同一性危机。     

Patterns of fish species distributions replicated across three parallel rivers suggest biotic zonation in response to a longitudinal temperature gradient

Environmental gradients determine the distributions of individual species, which, in turn, shape patterns of species assemblage across those gradients. We used species distribution models to study the assemblage of fish species along the three mainstem rivers in the South Saskatchewan River Basin (SSRB) in Alberta, which flow in parallel across an 800‐km longitudinal span and down 1400 m from the Rocky Mountains to the Great Plains of North America. We estimated the similarity of species assemblages along each river to identify general patterns of species assemblage associated with temperature and five other physiochemical variables. Mean July water temperature, which ranged from <11°C at high elevation to >21°C at low elevation, was strongly associated with the presence–absence of most species in the SSRB. We found that high turnover occurred at two locations along the longitudinal gradient: where mean July water temperature was approximately 15°C and where mean July water temperature was approximately 19 or 20°C. There was also an increase in species richness at lower elevations where water temperatures were higher. Models incorporating forecasted changes in water temperature with climate change will likely provide accurate predictions of changes in the diversity and distribution of riverine fish communities across topographically heterogeneous landscapes.     

基于流形的封闭曲线光顺优化插值方法

为了将基于流形的封闭参数曲线构造方法引入工程实际应用中,在研究此类封闭曲线上点的一二阶导矢量计算方法以及节点矢量的确定方法基础上,提出了结合整体光顺优化方法的、在插值点处G1连续的任意次封闭参数曲线插值方法,该算法弥补了常规插值算法未考虑插值曲线光顺性的缺陷,使得所得到的插值曲线在满足给定约束条件下尽可能地光顺,最后以实例验证了本文算法的有效性。