不同收缩角喷嘴的射流仿真研究

应用Fluent仿真软件,对收缩角为5°、10°、20°、30°、40°和50°6种喷嘴在20 MPa和30 MPa压力下进行了射流仿真,并对仿真结果进行了比较分析。结果表明,轴线方向最大速度随收缩角的增大呈递减趋势;射流稳定性以喷嘴收缩角为10°的最好;不同压力条件下同一喷嘴的射流有着相似的特性。通过仿真可以为喷嘴形状和压力泵的选择提供一定的依据。     

铁盐催化剂在氧化法制备D-阿拉伯糖中的应用研究

研究了不同的铁盐在葡萄糖酸钙氧化制备D-阿拉伯糖的催化效果,通过高效液相检测葡萄糖酸钙的转化率和阿拉伯糖的含量,对比分析了不同铁盐的催化效果,确定了葡萄糖酸铁为葡萄糖酸钙制备D-阿拉伯糖的最佳催化剂,同时研究了葡萄糖酸铁在葡萄糖酸钙氧化降解制备阿拉伯糖最佳反应条件。为化学氧化法制备D-阿拉伯糖奠定了基础。     

Nonlinear properties analysis on rutting behaviour of bituminous materials with different air void contents

Rutting is one of the major distresses of flexible pavement. It is defined as the formation of longitudinal depressions along the wheel paths caused by the progressive movement of materials under traffic loading in the asphalt pavement layers or in the underlying base through consolidation or plastic flow. This structural damage has a negative financial impact to the economy. In this study, the rutting behaviour of bituminous materials with different air void contents was investigated. The dynamic cyclic compression testing was carried out to establish nonlinear material models with multiple regression technique. With the specified material models, finite element analysis was carried out to study the rutting behaviour of the wearing course materials with different air void contents in a flexible pavement structure. The simulation result shows that the rutting depth is small at the air void contents of 4.5–8% for wearing course materials. However, for the air void contents above or below this range, the rutting resistance reduces, and thus the rutting depth increases. To verify this simulation result, wheel tracking tests were performed to obtain laboratory data, and the test data was found to be very close to the simulated one. This proved that the developed nonlinear model is applicable to simulate the rutting performance of bituminous mixture and it is a convenient and economical method to be used for the design of bituminous mixtures for both new and rehabilitated pavements.     

Preparation and characterization of polybenzoxazine/trisilanol polyhedral oligomeric silsesquioxanes composites

The benzoxazine/incomplete trisilanol POSS mixtures were prepared by solvent method, and the corresponding composites were obtained after curing. The structures, curing behavior and thermal properties were characterized by FTIR, X-ray diffraction, DSC, DMA and TGA. The results showed that chemical bonds have been formed between trisilanolphenyl POSS and PBZ, and trisilanolphenyl POSS possessed better compatibility with the matrix than trisilanolisobutyl POSS; the dynamic viscoelastic properties and thermal stability of the composites have been greatly enhanced by the incorporation of trisilanolphenyl POSS. However, the improvements on the dynamic viscoelastic properties of PBZ/trisilanolisobutyl POSS were not so markedly.     

基于Agent的泵站智能控制-维护-管理集成系统

在简要介绍智能体、多智能体系统、智能控制、维护和管理研究现状的基础上,提出基于多智能体的分布式泵站智能控制、维护和管理集成系统的框架,最后探讨基于多智能体的泵站ICMMS系统的实现问题,并给出了一个具体的实例。     

地空导弹系统可测试性设计

针对地空导弹武器系统检测维修困难的现状，利用可测性设计技术，提出了地空导弹武器系统可测性设计的方法。阐述了地空导弹武器中测试性设计的必要性，论述了可测性设计的基本理论，分析了地空导弹武器系统可测性设计涉及的相关问题。     

利用六序分量复合序网法分析同杆双回线断线故障的新方法

本文结合双回线的特点，引入了六序故障分量，推导出同杆双回线各种断线故障的六序分量解析表达式，由此提出了六序复合序网分析双回线断线故障的新方法，此方法在分析双回线的断线时非常简单，并且六序故障分量之间的相位关系和幅值关系在复合序网中直观地表现出来，通过EMTP仿真计算证明了本文所提方法的正确性。     

捷联惯测组合旋转机构的研究

基于角运动测量、鉴相测频、DSP、脉宽控制、虚拟仪器等技术,对捷联惯测组合旋转机构软硬件设计进行了总结,给出了试验结果,所得结论具有较高的实用价值.     

“十五”期间黄河水资源开发利用工程规划意见

分析了黄河流域水资源开发利用工程建设存在的问题,预测了21世纪初期沿黄地区国民经济发展对黄河水资源的需求,在此基础上提出了“十五”期间黄河水资源开发利用工程建设的总体思路、布局以及工程建设安排的原则。为促进沿黄地区国民经济的发展和西部大开发战略的顺利实施,并保障黄河水资源的可持续利用,在充分考虑各省（区）国民经济发展需要的基础上,根据工程建设安排的原则,针对不同地区的情况,提出了“十五”期间各类水资源开发利用工程安排的规划意见,工程安排上突出了节水和水资源优化配置工程建设。     

高炉恶性炉况的处理

介绍了城钢432m3高炉恶性炉况的产生经过及处理措施并进行了总结分析,为今后处理类似炉况提供借鉴依据。