Catalytic properties of mesoporous materials supported heteropoly acids for Baeyer-Villiger oxidation of cyclic ketones

Three mesoporous molecular sieves loaded silicotungstic acids, named HSiW/SBA-15, HSiW/MCM-41, HSiW/MCM-48, were prepared and characterised by XRD, FT-IR, TEM and SEM. The catalytic performance of the prepared materials for the Baeyer-Villiger oxidation of cyclic ketones was carried out in the presence of 30%H₂O₂ under mild conditions. These loading materials were proved to be efficient and reusable catalysts, they all exhibited excellent catalytic performance for the Baeyer-Villiger oxidation of cyclic ketones with 30% H₂O₂ as oxidant. Many cyclic ketones were efficiently converted to the corresponding lactones with up to 90% conversions and high selectivities under the optimum reaction conditions.

Cyclic ketones were efficiently oxidised by mesoporous materials sopported silicotungstic acid to the corresponding lactones with 30%H₂O₂ as oxidant. All of the catalysts showed promising recyclability in the reactions.     

采煤工作面初次放顶的技术与管理

在采煤工作面初次放顶期间，通过对各类顶板矿压活动规律的观测，确定初次放顶的各项参数及计算方法。以指导初次放顶工作。采用统计学的方法进行了矿压分析和总结，根据初次放顶顶板情况进行了合理分类。并对矿压观测站的建立、矿压观测和压力显现情况提出了指导性的管理措施。对初次放顶的管理工作提出了具体的技术管理措施，并取得了明显的效果。     

三维锚杆的数值模拟方法

在现有几种锚杆数值分析方法的基础上,对考虑了灌浆切向受力性态的三维锚杆单元理论及其应用进行了研究,编制了三维锚杆有限元计算程序,并结合例子对灌浆锚杆的变形应力规律进行了分析.     

个人信贷决策支持系统初探

在分析了个人信用信息特征的基础上，提出了一种基于数据挖掘、OLAP(联机分析处理)的个人信贷决策支持系统的设计方案。讨论了OLAP、数据挖掘和数据仓库技术在个人信贷决策支持系统上的应用，并构建了一个个人信贷决策支持系统的架构。     

罗江隧道爆破和支护施工技术

通过化州(罗江)隧道穿越工程实例,探讨了隧道施工光面爆破设计和隧道支护施工的具体方法,为类似工程的施工提供参考。     

基于随机有限元法的非机动车钢桥摩擦型高强螺栓可靠性分析

摩擦型高强螺栓连接是实现全拆装非机动车钢结构桥梁快速装配化建设的重要构件之一。为研究非机动车钢结构桥梁高强螺栓连接的可靠性能,首先,采用有限元方法建立高强螺栓数值模型,并对模拟方法进行了准确性分析;其次,在此基础上,利用响应面随机有限元法研究了随机变量对高强螺栓结构性能响应的影响,通过随机车流程序计算了非机动车桥梁荷载效应;最后,利用可靠度设计方法研究了钢板梁高强螺栓的抗力分项系数。结果表明：随机变量变异性对高强螺栓不同目标性能有不同程度影响,非机动车荷载作用下的钢桥高强螺栓设计承载力要稍高于现行规范理论公式计算值。     

牵引辊法兰螺栓的受力分析

针对螺检失效的现象，从受力分析角度出发，提出了其失效的原因：(1)当工作载荷加大或装配预应力超过螺栓的强度极限时，螺栓发生失效，表现为螺栓断裂；(2)当装配预应力裕量太小时，而螺栓经常过载工作，导致接触面松动，同样会导致螺栓或接触面磨损，在此基础上得出结论，主要国产设备的螺栓设计强度是足够的，且还有一定潜力可挖，而螺栓失效的原因是使用不当。     

Code Component Reuse Supporting Environment (CCRSE) and its design strategy

Code Component Reuse Supporting Environment (CCRSE), which has been developed by us, is an integrated development environment. CCRSE can provide comprehensive supports for the whole process of reusing code component in the manner of dynamic composition. The architecture and functionality of CCRSE are introduced in this paper.The key achievement of this paper is giving the three strategies that are vital to successfully design CCRSE. The three strategies include: (1) according to the three pivotal technologies ( encapsulation, composition and management) for supporting composition reuse of code component, design three tools respectively. (2) keep tool for supporting code component development independent of tool for supporting code component composition. (3) strictly restrict code component specification, provide the strong "plug and play" support for code component composition reuse, and furthest provide transparence to strictly restricted specification of code component in development of component itse     

机匣纵向安装边螺栓联结结构参数对泄露压力的影响

航空发动机机匣安装边多采用不含垫片的螺栓联结结构形式,安装边除了刚度及强度要求外,还有气体密封要求,特别是对内压力较大的高压压气机机匣。本文利用线弹性断裂力学的相关理论,简化螺栓法兰联结结构,推导出泄露压力计算公式。利用workbench软件进行仿真计算,得出螺栓联结处的正应力分布,求得泄露压力。通过有限元计算,研究了螺栓预紧力、螺栓位置和法兰厚度等参数对泄露压力的影响,为机匣纵向安装边螺栓联结结构参数设计提供了参考依据     

用约束正负定式几何规划迭代法进行普通螺栓组联接的优化设计

本文用约束正负定式几何规划迭代法对普通螺栓组联接进行了优化设计，结果表明：该法与其它优化方法比较，可降低问题的困难度，该法是求解广义的几何规划问题的一种行之有效的方法。