无机架双辊式铸轧机设计要点

双辊式铸轧机在投入工业性生产以来的近卅年里得到了飞速的发展。它以简单的工艺代替了热轧铝带所需的全部铸坯、机械处理、加热、开坯及热轧工序。而其生产的铝带卷是铝带轧机及铝箔轧机的原料。本文介绍了作者设计的一种新型连铸机即“无机架双辊式铸轧机”并申报了中国专利。1995年8月,一台无机架双辊式铸轧机已在成都一家铅带工厂投入工业性生产。     

基于无线温度监测的内燃机连杆轴瓦故障诊断技术研究

针对内燃机连杆轴瓦故障频发且监测手段有限的技术难点,提出了基于无线温度监测的连杆轴瓦磨损类故障诊断方法。通过分析连杆轴瓦与轴径相对运动时的摩擦力学关系,在考虑润滑的前提下推导出轴瓦温升计算方程,作为基于温度监测的轴瓦故障诊断方法的理论依据;以TBD234V12型柴油机为对象,搭建连杆轴瓦故障模拟实验台模拟轴瓦磨损故障,并配置无线测温系统捕捉异常温度信号,对比正常情况下的温度信号可知,磨损的连杆轴瓦表面温度相比正常轴瓦温度有明显上升。理论和模拟实验结果表明,基于无线温度监测的内燃机连杆轴瓦故障诊断方法具有较高实用价值。     

Phytochemistry,Medicinal Properties,Bioactive Compounds,and Therapeutic Potential of the Genus Eremophila (Scrophulariaceae)

The genus Eremophila (family Scrophulariaceae) consists of approximately 200 species that are widely distributed in the semi-arid and arid regions of Australia. Multiple Eremophila spp. are used as traditional medicines by the First Australians in the areas in which they grow. They are used for their antibacterial, antifungal, antiviral, antioxidant, anti-diabetic, anti-inflammatory, and cardiac properties. Many species of this genus are beneficial against several diseases and ailments. The antibacterial properties of the genus have been relatively well studied, with several important compounds identified and their mechanisms studied. In particular, Eremophila spp. are rich in terpenoids, and the antimicrobial bioactivities of many of these compounds have already been confirmed. The therapeutic properties of Eremophila spp. preparations and purified compounds have received substantially less attention, and much study is required to validate the traditional uses and to highlight species that warrant further investigation as drug leads. The aim of this study is to review and summarise the research into the medicinal properties, therapeutic mechanisms, and phytochemistry of Eremophila spp., with the aim of focussing future studies into the therapeutic potential of this important genus.     

西安市园林花灌木主要害虫发生规律及防治研究

园林花灌木在园林植物中,无论品种、数量、栽植面积上占有相当大的比重．由于实际应用中过分依赖少数品种,导致占主导地位的花灌木害虫发生较为严重．通过对西安园林花灌木害虫发生规律的调查,制定出相应的防治措施,提高园林花灌木观赏效果和生态效益．     

提速客货车用改性氟塑料-金属复合衬套材料的试验研究

用纳米氧化锌作为填充剂,通过机械搅拌和超声振荡处理,制备了纳米氧化锌改性聚四氟乙烯材料,并对改性后的氟塑料与金属复合研制的衬套的摩擦磨损性能变化的机理进行了分析.结果表明,各项性能均达到或超过了标准规定的技术要求,为该衬套在提速客货车中的应用奠定了基础.     

MC尼龙瓦替代橡胶开炼机青铜瓦的试验研究

本文阐述了ＭＣ尼龙的性能特点，并与青铜作了对比。在橡胶开炼机青铜瓦失效后用ＭＣ尼龙瓦替代时，论述了设计、制造和使用过程中的要点．     

微波消解-石墨炉原子吸收光谱法测定灌木枝叶中的As，Pb，Cd，Cr，Ni

采用微波消解-石墨炉原子吸收光谱法,考察了微波消解体系、基体改进剂、灰化/原子化温度等因素对测定的影响,测定灌木枝叶中 As ,Pb ,Cd ,Cr ,Ni的平均回收率分别为97．5％,98．3％,99．8％,99．0％,98．2％,检出限分别为0．045,0．058,0．008,0．064,0．130mg/kg,所测灌木枝叶中含量分别为0．96,7．46,0．15,2．35,1．73mg/kg,接近标准值。     

双头单螺杆泵衬套有限元分析

用ANSYS对双头单螺杆泵衬套的受力情况作了有限元计算,为了提高计算效率,将螺杆泵衬套的有限元模型简化为平面应变模型求解。讨论了双头单螺杆泵衬套在受到均匀压力与非均匀压力,以及衬套和螺杆在静态接触的情况下,衬套内各点的变形、应力与应变的分布;揭示了双头单螺杆泵衬套的受力状态和变形规律。为双头单螺杆泵的结构优化设计及性能改善提供了参考依据。     

空心微珠保温冒口的研制与应用

在铸造生产中采用空心微珠制作保温冒口,在大、中、小型铸钢件上应用,保温效果良好,延长了冒口的凝固时间,不仅消除了铸件的缩孔及缩松等缺陷,而且冒口的补缩效率明显提高,由原来的20％,提高到30％-40％。铸件工艺出品率由原来的60％,提高到70％-73％。大量节约了金属液,节省了人力及能源。     

汽轮机转子中心孔进油原因分析及处理

针对某50MW汽轮机发电机组因轴瓦动刚度不足和汽轮机转子中心孔进油而产生强烈振动的现象，阐述了导致振动的机理以及诊断的方法，提出了消除振动的措施。