5-硝基愈长木酚的合成

5-硝基愈创木酚作为高效、低毒植物调节剂,一直倍受关注.它的合成目前主要采用愈创木酚硝化法,以发烟硝酸和冰醋酸混酸做硝化剂.本文由愈创木酚为起始原料,经酚酯化、硝化、水解等步骤合成了5-硝基愈刨木酚.酚酯化采用碱催化法,收率可达96%以上;硝化反应则采用乙酸酐和硝酸混合物为硝化剂.5-硝基愈创木酚最高收率可达到91%.     

脲类杀菌剂戊菌隆的合成

以对氯氯苄为原料，先与六甲基次胺进行胺化反应制得对氯苄胺；然后在Raney Ni催化剂存在下。在高压釜中与环戊酮进行缩合反应，同时加氢还原，得到N-对氯苄基-N-环戊胺；最后N-对氯苄基-N-环戊胺与苯基异氰酸酯在50℃的甲苯溶液中缩合，处理后得到戊菌隆。产品戊菌隆含量95％，以对氯氯苄计总收率67．3％。     

Study on polymerization of acrylonitrile with methylacrylate and itaconic acid in mixed solvent

Isothermal crystallization kinetics were investigated by differential scanning calorimetry (DSC) for poly(p-phenylene sulfide) (PPS) doped with amorphous carbon or crystalline graphite particles. Both types of carbon forms have been found to affect the crystallization behavior of PPS to different extents. The crystalline graphite particles have a more pronounced effect on the overall rate as well as mechanisms of PPS crystallization than do the amorphous carbon particles. Relative contributions and competition from crystallizations of two different crystals in the later-stage crystallization of PPS have been found to cause the phenomenon of deviation from linearity in the Avrami plots. A sequential crystallization model has been shown to describe well the crystallization behavior of the PPS doped with the particles. © 1995 John Wiley & Sons, Inc.     

基于退化四元小波变换的纸币识别

针对如何提取纸币图像特征和提高识别率的问题,综合利用退化四元小波变换具有的相位特性,提出一种基于退化四元小波变换的纸币识别方法.该方法首先对采集的纸币图像进行倾斜校正和边缘检测,然后运用退化四元小波对纸币图像进行分解操作,并对分解系数进行统计分析,将每个分解子带系数的能量和标准差作为该纸币图像的特征向量,最后将支持向量机作为分类器对纸币图像进行识别.本文方法在资源约束的嵌入式清分系统上实现,实验结果表明采用本文提出的算法突破了传统纸币识别系统识别率很难再提高的瓶颈,同时能够满足清分系统的实时性要求.     

以设计为中心的虚拟制造技术及在化工过程装备中的应用

简述了虚拟制造技术的内涵、关键技术及应用现状。在分析化工过程装备特点基础上 ,对过程装备虚拟制造技术平台的体系结构进行了探讨 ,以典型过程装备螺旋片导流式气液分离器为例 ,对其数字化建模方法、数值仿真技术、虚拟设计和制造环境进行了研究。初步结果表明 :以设计为中心的虚拟制造技术的应用 ,可以有效地减少产品开发的时间和成本 ,提高产品质量     

纳米二氧化硅与SBR复合改性乳化沥青的性能研究

用差示扫描量热法（DSC）对纳米二氧化硅与SBR复合改性乳化沥青蒸发残留物的热性能进行研究。结果表明，加入SBR乳液、纳米二氧化硅后样品的温度稳定性和耐高温性能均得到提高；其中SBR（质量分数0．03）加纳米二氧化硅（质量分数0．0005）复合改性效果最佳。纳米二氧化硅与SBR形成网状结构以及SBR在体系中吸附油分后的溶胀作用是沥青性能改善的主要原因。     

BT-75/4.2-M循环流化床锅炉系统改造与节能增效

云天化股份公司的2台BT-75／4．2-M锅炉因设计和制造的原因而致使其运行中出现了许多问题。锅炉负荷上不去，经常发生故障而停炉，运行极不正常；能耗高，成本高；经车间对锅炉进行系统改造后。不仅使该装置生产实现“安、稳、长、满、优质运行”，而且降低了锅炉的能耗和成本，使得经济效益最大化。     

有机溶剂下盐酸环丙沙星的荧光特性研究

本文在几种有机试剂(乙醇，甲醇，丙酮)条件下，对盐酸环丙沙星产生的荧光特性进行了初步的研究，并初步探讨了有机溶剂下温度对其荧光强度的影响。     

HDPE/LLDPE reactor blends with bimodal microstructures—part I: mechanical properties

Reactor blends of polyethylene/poly(ethylene-co-1-octene) resins with bimodal molecular weight and bimodal short chain branching distributions were synthesized in a two-step polymerization process. The compositions of these blends range from low molecular weight (LMW) homopolymer to high molecular weight (HMW) copolymer and, vice versa, HMW homopolymer to LMW copolymer. The physical properties of the blends were found to be consistent with the nature of the individual components. For the tensile properties, the stiffness decreases with increasing the fraction of the copolymer, regardless of the molecular weight of the homopolymer fraction. For these blends with bimodal microstructures, it was confirmed that the degree of crystallinity governs the stiffness of the polymer. However, the energy dampening properties of the polymers benefit from the presence of the copolymer. A balance of stiffness and toughness can be obtained by altering the composition of the blends. For some blends, the presence of HMW homopolymer can dominate the tensile properties, showing little variation in the stiffness with increased addition of copolymer. It was also demonstrated that the testing conditions and thermal treatment of the polymer greatly influence the resulting elastic and energy dampening properties. Depending on the desired application, annealing these polymers (especially very low density copolymers) not only increases the crystallinity and stiffness, but also changes the frequency response of the dynamic mechanical properties.     

氢化物发生的机理及其在原子光谱中的应用

详细介绍了氢化物发生的反应体系和氢化反应的两种机理,并讨论了氢化物发生法在原子光谱中的应用现状和发展趋势。