Synthesis and Crystal Structure of Trans-4-[(5-(2,4-Dichlorophenoxy)-3-methyl-1-phenyl-1H-pyrazol-4-yl)methyleneamino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one

The title compound trans-4-[(5-(2,4-dichlorophenoxy)-3-methyl-1-phenyl-1H-pyra-zol-4-yl)methyleneamino]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one 3 (C28H23Cl2N5O2, Mr = 532.41) has been synthesized and its crystal structure was determined by single-crystal X-ray diffraction analysis. It crystallizes in triclinic, space group P1 with a = 8.9438(4), b = 11.6065(5), c = 14.2215(6) , α = 112.566(1), β = 92.324(2), γ = 102.91(1)o, V = 1315.65(10) 3, Z = 2, Dc = 1.344 g/cm3, μ(MoKα) = 0.282 mm-1, λ = 0.71073 , F(000) = 552, the final R = 0.0587 and wR = 0.1578 for 5071 observed reflections (I > 2σ(I)). X-ray analysis reveals that the product is a thermodynamically stable trans isomer. Intra-and intermolecular C(12)-H(12)···O(1) and C(28)-H(28)···O(1)#1 hydrogen bonds were observed in the title compound.     

PP/HDPE 共混物及其纳米复合材料超临界流体微孔发泡

通过间歇法制备了聚丙烯(PP)/高密度聚乙烯(HDPE)共混物及其纳米复合材料的微孔塑料.用扫描电镜对发泡样品的泡孔结构进行表征,研究了纳米粒子的类型和含量对泡孔结构的影响.结果表明:在PP中加入25%的HDPE可改善泡孔结构;在 PP/HDPE 共混物中加入纳米粒子可使泡孔的直径减小、密度增加、泡孔分布更均匀;泡孔直径随着纳米粒子含量的增加会出现先减小后增加的趋势.     

基于多维名义模型的加权似然估计方法(英文)

The Monte Carlo study evaluates the relative accuracy of Warm's (1989) weighted likelihood estimate (WLE) compared to the maximum likelihood estimate (MLE) using the nominal response model. And the results indicate that WLE was more accurate than MLE.     

分散化供应链的自组织演化机制建模与仿真

供应链是一个复杂适应系统.提出了分散化供应链演化的自组织机制.在开放结构下,多企业主体为了适应外部环境,在非线性互动中涌现出供应链协作结构和协调模式.借鉴生物系统环境适应能力思想,建立了分散化供应链自组织演化模型,并采用Multi-agent技术进行仿真,证明了分散化供应链的自组织演化机制.外部环境和企业内部机制因素控制着分散化供应链的演化,其演化对初始条件高度敏感,存在着锁定、路径依赖和混沌等自组织系统特性.     

吡氟禾草灵的高效液相色谱法拆分与测定

在流动相为正庚烷-异丙醇-三氟乙酸(99.3:0.5:0.2,体积比),流速为0.6 mL·min-1,检测波长为273 am,柱温为10℃的分析条件下,利用手性色谱柱Nucleosil chiral-2实现了吡氟禾草灵对映体的手性分离,在优化的色谱分离条件下,R-型异构体的峰面积与其对应浓度之间保持线性关系,其对应的线性回归方程为A=(236.30ρ 1.94)×100,其相关系数为0.9991.据此可定量测定R型异构体.     

一种带链规则的变样本容量X图

将一种链规则和变化样本容量的思想一起并入休哈特均值图以加快其发现过程均值小漂移的速度.利用马氏链方法计算了控制图稳态表现下的平均链长.与几种图的比较显示,该图能显著加速发现过程均值小的漂移.     

Theoretical Studies on the N-Phenylpyrrolidine Formation Mechanism Based on the Reaction of Phenylamine with 1,4-Butanediol

The reaction mechanism of phenylamine reacting with 1,4-butanediol to give N- phenylpyrrolidine was investigated with traditional transition state theory. Based on the experimental results, two reaction channels were discussed. The geometries of their reactants, products, intermediates and transition states were optimized. The possible transition State and activation energy were determined by vibrational analysis and IRC verification. And finally, the main reaction channel was given.     

射线成像检测中射线源焦点的影响及修正

本文分析了在工业无损检测中射线源焦点对成像质量的影响，讨论了射线源焦点对成像影响的数学模型，以此为基础，设计了相应的焦点修正算法，并给出了处理结果