编织重经织物时经纱张力分析

本文是研究在单针床经编机上编织重经织物。为了减少编织过程的张力、作者设计了一个测量系统。借助于信号分析技术研究了纱线的张力波动规律。结果表明,在编织过程中纱线张力呈周期性变化,在一个周期中至少有三个峰值,编织过程中成圈机件位置变化对经纱张力有很大影响。通过调整机器,成功地编织出一些重经织物。     

非平稳随机过程谱密度函数的另一定义及实例分析

用时变谱描述非平稳过程的谱密度能够反映非平稳过程频率成份的时变特点，但是其物理概念仍不是很明确。为此，文章给出一种非时变谱的定义形式以及在此定义下的一个实例分析。     

高储能密度电容器复合介质材料的研究

对高储能密度电容器复合介质材料作了研究。采用介电陶瓷／有机聚合物作复合介质材料的实验中，研究了复合材料的介电系数与组成成分的关系，研究发现，ε随陶瓷成分的增加而增大，并且存在一个临界组。     

一种新的规则获取增量式算法

对新增样例给出了新的分类,针对此分类提出了新的规则获取的增量式学习算法DLR I,并就该算法与经典算法的复杂性进行了分析比较,得出增量学习算法较经典算法有较低的时间复杂性,可以有效地提高大型数据库的规则维护效率.     

原子簇Fe3BP异构体稳定性的DFT研究

利用含相关能校正的DFT方法在B3LYP／Lard2dz水平下，对原子簇Fe3BP16种可能构型进行单重态下的全参数优化和频率计算，分析比较了优化结果的能量、结合能和过渡态．结果表明：原子簇Fe3BP有5种稳定异构体，具有立体构型的异构体1、2、3和4共存的可能性较大，其中异构体1最稳定，而平面结构的异构体5存在的可能性较小。     

Reconstruction of Temperature Field in 3-D, Absorbing, Emitting, and Anisotropically Scattering Medium

IntroductionRecently ,theinvestigation on numerical radiative heattransfer has been focused onthe reconstruction of temperatureprofile in target space according to its boundary heat fluxgained by detectors[1 8], whichis a kind of inverse problemofradiation. Among these investigation, Li HY[1 4]hasresearched on one-di mension or two-di mension rectangular ,spherical or cylindrical medium which is absorbing ,emitting , and isotropically scattering ; Liu LH[5,6]hasresearched on the semitranspar…     

Combined Density-based and Constraint-based Algorithm for Clustering

We propose a new clustering algorithm that assists the researchers to quickly and accurately analyze data. We call this algorithm Combined Density-based and Constraint-based Algorithm （CDC）. CDC consists of two phases. In the first phase, CDC employs the idea of density-based clustering algorithm to split the original data into a number of fragmented clusters. At the same time, CDC cuts off the noises and outliers. In the second phase, CDC employs the concept of K-means clustering algorithm to select a greater cluster to be the center. Then, the greater cluster merges some smaller clusters which satisfy some constraint rules.Due to the merged clusters around the center cluster, the clustering results show high accu racy. Moreover, CDC reduces the calculations and speeds up the clustering process. In this paper, the accuracy of CDC is evaluated and compared with those of K-means, hierarchical clustering, and the genetic clustering algorithm （GCA）proposed in 2004. Experimental results show that CDC has better performance.     

基于RAMP密度插值理论的拓扑优化准则法

在研究密度插值法理论和拓扑优化准则基础上,以结构整体柔度最小为目标,推导了基于RAMP插值理论的优化准则,并实现优化准则的迭代算法,二维算例说明了算法正确性、有效性。     

Theoretical studies of C36 encapsulated in zigzag single-wall carbon nanotubes

Discovery of carbon nanotubes (CNTs) has attracted considerable attention in the scientific community due to their unique structures and properties. Chemical doping can further modify the electrical properties of CNT. The empty space inside CNT provides t…     

环丙烷在铜表面解离吸附过程的理论研究

采用密度泛函理论研究了吸附在铜表面的环丙烷的解离吸附过程.环丙烷在大约10eV能量的照射下被激发到第一激发态,处于激发态的分子与铜表面相互作用,电子从铜表面向环丙烷转移使环丙烷的碳碳键活化.根据对各种可能中间态的能量分析,提出了环丙烷在铜表面解离吸附的可能路线,计算的结果证实最稳定的吸附物种是含两个铜原子的五元环化合物.