齿轮传动的等弯曲强度优化设计

本文是在以前研究的基础上［２］［３］［４］，进一步完成齿轮传动等弯曲强度表达式；并建立了其优化设计模型。借助已开发的优化程序，可进行齿轮传动等弯曲强度优化设计。     

等面积法则的真实意义

对于等面积法则的证明有不少争议，本文阐明等面积法则的真实意义．     

等规聚丙烯氯化工艺研究

以等规聚丙烯、氯气为原料，通过催化氯化的方法制备了氯化等规聚丙烯树脂。进行了合成的各条伯试验，获得了适宜的操作参数，控制有关条件，可获得不同氯含量的系列氯化聚丙烯。测定了该产品的物化性能，显示了良好的适用性。     

酪蛋白的提取及检测

在基础生物化学酶学部分的实验中，多以酪蛋白作为酶的反应底物。本实验应用等电沉淀法从牛奶中分离酪蛋白，并对其与标准酪蛋白试剂进行水分、酸度、脂肪、灰分的测定比较，希望用其代替标准酪蛋白试剂，降低实验费用。     

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.