P⌒O环钯配合物的合成及对Suzuki交叉偶联反应的催化性能

P⌒O环钯配合物的合成及对Suzuki交叉偶联反应的催化性能;合成;二苯基膦丙酸钠;Suzuki偶联反应     

化学课程结构的横向衔接性与创新思维

化学课程结构的横向衔接性包括化学教科书内容的横向衔接性和化学课程设置类型的横向衔接性。从化学教科书内容的横向衔接性分析,化学学科在培养学生的创新思维、提高学生的实践能力上发挥着重要的作用;从化学课程类型的横向衔接性分析,化学学科有利于增强学生探索未知世界的兴趣和能力等。在义务教育阶段的理科综合不能普及的情况下,化学课程结构的横向衔接性对于培养学生的创新思维和实践能力具有独特的作用。     

压电纤维复合材料的静电场分析

采用有限元法分析了外电压作用于压电纤维复合材料时的静电场分布,讨论了静电场对元件极化和作动性能的影响,研究了电极区聚合物的介电常数和厚度尺寸,及其IDE宽度和周期对压电纤维复合材料静电场的影响,研究结果表明:增加电极区聚合物的导电性,压电纤维复合材料静电场可以得到显著提高,最大可以提高54倍;减小电极区聚合物的厚度,同样可以显著提高静电场,最大可以提高55倍.IDE参数对电场的均匀性区域大小和电场强度大小影响也比较大.     

Effects of walk-off on cross-phase modulation induced modulation instability in an optical fibre with high-order dispersion

This paper investigates the effects of walk-off among optical pulses on cross-phase modulation induced modulation instability in the normal dispersion region of an optical fibre with high-order dispersion. The results indicate that, in the case of high-order dispersion, the walk-off effect takes on new characteristics and will influence considerably the shape, position and especially the number of the spectral regions of the gain spectra of modulation instability. Not only the group-velocity mismatch, but also the difference of the third-order dispersion of two optical waves will alter the gain spectra of modulation instability but in different ways. Depending on the values of the walk-off parameters, the number of the spectral regions may increase from two to at most four, and the spectral shape and position may change too.     

The effect of the attractive well of the potential energy surface for Ne--HCl on rotationally inelastic partial wave cross sections

An interaction potential of the Ne-HC1 van der Waals complex is obtained by utilizing the Huxley analytic potential function to fit the accurate interaction energy data, which have been computed at the coupled cluster singles and doubles including connected triple excitations level and with the augmented correlation consistent polarized valence quintuple zeta basis set extended with a set of 3s3p2dlflg mid-bond functions [CCSD （T）/aug-cc-pV5Z-33211]. The close coupling calculation of state-to-state partial cross sections for collision of Ne with HC1 is first performed by employing the fitted interaction potential. This calculation is performed at the incident energies： 40, 60, 75 and 100 meV, separately. The effects of the long-range attractive and the short-range anisotropic interactions on the inelastic state-to-state partial cross sections are discussed in detail. Two maxima are present in the rotationally inelastic partial cross sections and they originate from different mechanisms.[第一段]     

一种基于交叉相关的类星体的红移测量方法

给出了一种新的类星体光谱的红移测量方法。首先,利用提取出的发射谱线信息确定一组红移候选;然后,按这些红移候选将静止模板光谱红移,计算所得光谱与目标光谱的相关值;最后,确定最大相关值对应的红移候选为目标光谱的红移。相对于已有的基于谱线匹配的方法,此方法的性能受谱线提取效果的影响较小。实验结果表明： 此方法的鲁棒性较好,性能优于基于谱线匹配的方法。     

关于无机化学适应性教学的思考

当今社会,化学已悄然融入社会、技术和科学的各个领域,并且正在潜移默化地影响、改变着我们周围的世界和生活。根据21世纪对人才的知识结构、能力结构和基本素质要求,基础化学教育的任务,应摒弃传统的单纯的具体知识的传授,更多地应是侧重学生素质和能力的培养,强调科学思维、科学素质和创新精神,并将世界观、方法论的教育,智力和能力的提高融合于日常的教学中。化学学科中发展最早的一门分支科学——无机化学,是化工学院学生的第一门专业基础课。     

PO反应中混沌控制的变量交叉反馈方法研究

The variable cross feedback（VCF）method is proposed to control the nonlinear chaos system. The control principle is introduced,and the Peroxidase-Oxidase（PO）system is taken as a typical example to demonstrate the effectiveness of this method. The dynamical behaviors of the PO system controlled using the VCF method are given by computer numerical simulation. The results show that the return map of the system can be changed into the finite isolated points from the assemblage of discrete points having regular distribution and structure by appropriately     

带有四个不同芳基的环丁烷的合成、结构及光化学性质

通过不同杂芳基乙烯分子间的交叉光二聚反应在硫酸溶液中和中压汞灯照射下,合成了4种含7个不同取代芳基的环丁烷衍生物.用紫外和红外光谱及¹H和¹³CNMR谱确定其结构为顺式头尾相对型二聚体.