基于CYCBD和麻雀搜索算法的滚动轴承故障特征提取方法

目的解决在较强的噪声环境下最大二阶循环平稳盲解卷积(MaximumSecond OrderCyclostationary Blind Deconvolution,CYCBD)算法在滚动轴承故障特征提取时效果欠佳的问题,为滚转尾翼导弹的尾翼滚动轴承故障诊断提供方法参考。方法提出一种利用麻雀搜索算法(SparrowSearchAlgorithm,SSA)优化CYCBD算法的方法,将CYCBD算法解卷积的包络谱熵作为SSA寻优的适应度函数,利用SSA高效地寻找出合适的循环频率以及滤波器长度,选择自适应参数后,再使用CYCBD算法有效解卷得到周期脉冲特征。结果同时对比SSA优化CYCBD前后进行故障特征提取的包络谱图,CYCBD的噪声幅值不超过0.13 m/s^(2),峰值不超过0.29 m/s^(2),用SSA优化CYCBD的噪声幅值不超过0.08 m/s^(2),峰值不超过0.32 m/s^(2),故障频率成分更加突显,无论是噪声幅度,还是峰值幅度特性,均较CYCBD有了较大改善。结论仿真实验验证了SSA优化CYCBD方法能够更加清晰地辨识到故障特征频率及其倍频成分,其具有良好的工程应用前景。     

物理气相沉积硬质耐腐蚀磨损防护涂层研究进展

叙述了用物理气相沉积技术制备的硬质耐腐蚀磨损防护涂层的研究进展。重点介绍了腐蚀磨损耦合工况特性和作用机理,单元、多元掺杂氮化物涂层,高熵氮化物涂层,多层、纳米多层、纳米复合、梯度氮化物涂层耐腐蚀磨损性能研究,非金属元素/金属元素掺杂DLC涂层、多层复合DLC涂层耐腐蚀磨损性能研究,并对涂层改性、强化机理和腐蚀磨损失效机制进行了总结。最后,提出了未来物理气相沉积硬质耐腐蚀磨损防护涂层重点发展的方向,应重点发展涂层组元/结构设计、力–电耦合损伤机理研究、高效率研发设计、涂层先进制备装备与评估体系等方面的能力。     

大型中心传动浓缩（刮泥）机的应用与发展

阐述了大型中心传动浓缩机与周边传动浓缩机的结构特点及国内外的应用现状，分析了周边传动浓缩机存在的结构性缺陷，介绍了中心传动浓缩机的分类、技术特点以及其在国内的推广应用前景。     

Recovery of Cu and Fe from Printed Circuit Board waste sludge by ultrasound: Evaluation of industrial application

The paper presents a novel cleaner process for metal recovery from the Printed Circuit Board (PCB) waste sludge by assistance of ultrasound. The process can effectively recover heavy metals at low cost with high separation and recovery efficiency, produce high quality products and also achieve zero waste discharge with operation at industrial scale. With the PCB waste sludge containing (wet content) 3.14–4.85% copper and 3.71–4.23% iron, copper recovery efficiency of 95.2–97.5% and iron recovery efficiency of 97.1–98.5% were achieved, while the purity of copper sulfate produced by the process was 98.0% and the produced ferric chloride had a satisfied quality for using as a coagulant material for the plant on-site wastewater treatment. The process had been successfully scaled up to the industrial scaled applications in a heavy metal recovery plant in city of Huizhou, China for more than two years. The novel cleaner heavy metal recovery process has a great prospect on the applications of resources recovery and environmental protection practices.     

硫酸铝渣去除水中磷研究

分别以蒸馏水和太湖水为例,研究了硫酸铝渣去除水中磷的能力,并分析了其对水体Al3+、SO24-以及pH的影响.结果表明:(1)除太湖水pH为9.0、10.0两种条件外,随着磷平衡浓度的增加,硫酸铝渣除磷量趋于某一定值,其规律符合Langmuir吸附等温式；太湖水pH为9.0、10.0两种条件下,硫酸铝渣除磷量符合Fre...     

DNA同源性分析最终确定新疆中华根瘤菌（Sinorhizobium xinjiangensis）为一独立种

针对S.xinjiangensis分类地位的争议，从新疆再次分离获得34株快生大豆根瘤菌，在16SrDNAPCR-RFLP分析和SDS全细胞蛋白电泳分群的基础上，进行了16SrDNA全序列相似性和DNA同源性分析.所测4个菌株和S.fredii模式菌株USDA205的16SrDNA全序列有很高的相似性.而DNA同源性分析说明新分离的菌株代表与原定的S.xinjiangensis为一个DNA同源群.其模式菌株CCBAU110与S.fredii的2株参比菌株USDA194、2048之间的DNA同源性分别为31.5%和28.7%.S.fredii的模式菌株USDA205与新分离的菌株代表及原定的S.xinjiangensis的模式菌株和2个参比菌株之间的DNA同源性为20.8%～39%，远低于70%.属于种水平上的差异.按照国际细菌分类委员会以DNA同源性≥70%且△Tm≤5℃作为定种的标准，S.xinjiangensis是Sinorhizobium属中不同于S.fredii的一个独立的种.表3参20     

流体参数对埋地管道破坏的影响分析

在考虑流固耦合和断层活动作用的情况下,应用ADINA中流固耦合分析求解器ADINA-FSI,建立了埋地管道破坏分析的有限元模型,介绍了固体模型和流体模型的建模过程以及流固耦合计算过程、断层位移荷载加载和约束的实现以及模型参数选择等。依据计算结果,分析了管内介质及流速等参数对管道破坏的影响。管道内输送的介质密度和流速越大,管道越易破坏,故在埋地管道设计中应充分考虑管内介质的密度与流速。针对计算结果,提出了几点认识和建议。     

Ultrafine particle emission characteristics of diesel engine by on-board and test bench measurement

This study investigated the emission characteristics of ultrafine particles based on test bench and on-board measurements. The bench test results showed the ultrafine particle number concentration of the diesel engine to be in the range of (0.56-8.35) × 10⁸ cm^-3. The on-board measurement results illustrated that the ultrafine particles were strongly correlated with changes in real-world driving cycles. The particle number concentration was down to 2.0 × 10⁶ cm^-3 and 2.7 × 10⁷ cm^-3 under decelerating and idling operations and as high as 5.0 × 10⁸ cm^-3 under accelerating operation. It was also indicated that the particle number measured by the two methods increased with the growth of engine load at each engine speed in both cases. The particle number presented a "U" shaped distribution with changing speed at high engine load conditions, which implies that the particle number will reach its lowest level at medium engine speeds. The particle sizes of both measurements showed single mode distributions. The peak of particle size was located at about 50-80 nm in the accumulation mode particle range. Nucleation mode particles will significantly increase at low engine load operations like idling and decelerating caused by the high concentration of unburned organic compounds.     

江苏里下河腹部地区湖泊湖荡春季浮游植物群落结构和营养状态

以江苏省里下河腹部地区38个典型湖泊湖荡为研究对象,分析了春季浮游植物群落结构特征及其与环境因子的关系,运用了基于理化指标的综合营养状态指数(TLI)评价方法和基于浮游植物群落结构分析的生物指标(Shannon-Wiener多样性指数H′和Pielou均匀度指数J)评价方法,评价了湖泊湖荡营养状态.结果显示共采集到里下河腹部地区湖泊湖荡浮游植物7门50属89种,主要隶属于绿藻门(Chlorophyta)和硅藻门(Bacillariophyta);浮游植物细胞丰度介于2.3×10~5～3.7×10~7 cells·L~(-1),生物量介于0.05～15.02 mg·L~(-1),绿藻门与隐藻门(Cryptophyta)在细胞丰度上占优势,隐藻门在生物量上占优势;梅尼小环藻(Cyclotella meneghiniana)、啮蚀隐藻(Cryptomonas erosa)、尖尾蓝隐藻(Chroomonas acuta)、四尾栅藻(Scenedesmus guadricauda)为主要优势种;生物指标评价方法的结果显示湖泊湖荡总体为轻度富营养,与TLI评价方法的结果有较好一致性,表明两类评价方法在里下河腹部地区具有较强内在关联性.     

先进冷喷涂技术的应用及展望

首先介绍了冷喷涂技术的原理及特点,在此基础上,重点讨论了冷喷涂技术在不同领域的应用。最后,结合我国冷喷涂技术的发展现状,提出了冷喷涂技术的发展方向,并指出发展先进冷喷涂技术符合我国先进技术的发展需求,有助于提高我国制造业的综合水平。