建筑卷扬机卷筒端侧板强度的理论分析与试验研究

本文依据理论分析、光弹性试验、电测试验并经数学拟合,建立了卷扬机卷筒端侧板强度计算公式.     

细支纱摩擦纺初探——尘笼胆结构及其安装角α对纺纱的影响

本文以细支纱摩擦纺为研究对象,利用实验测试手段研究了尘笼胆结构对吸口轴向负压和尘笼胆安装角α对加捻区轴向负压和流速分布的影响。最后,基于类似于控制论中的“黑箱”原理,采用二次正交回归设计在实验室自制单头机上进行了32支纱的纺纱试验,建立了加捻辊加稔效率、纱线品质指标及CV值与尘笼胆几何尺寸、尘笼胆安装角α、摩擦辊转速及纺纱速度间的关系,并作了分析,由此得到选取α=0°、S=6毫米左右较好的结果。     

高分辨率磁旋转编码器磁鼓材料的研制

采用磁浆涂布工艺制作了磁鼓涂层材料.研究了不同组分的配方对磁鼓涂层材料性能的影响,制备出性能良好的磁鼓.对Φ32～40mm的磁鼓进行了充磁测试,写入了128和256对极.采用金属薄膜磁电阻传感探头检测磁鼓表面分布磁场,信号通过电路放大、整形后接入示波器和计数器,结果显示输出信号波形良好,计数完整.     

滚筒装煤时煤流循环系数的计算

分析了采煤机螺旋简装煤过程中煤流的循环现象，导出了循环煤量及循环系数的计算式，讨论了影响循环系数的几种重要因素。     

采煤机滚筒截装过程的运动学分析

分析了螺旋滚筒截割和装载过程的运动特性，可为滚筒的参数选择提供一定的理论依据。     

太钢原料场混匀堆料机卷筒箱的改进

介绍了太钢炼铁厂原料场混匀堆料机卷筒箱的使用状况,对混匀堆料机卷筒箱使用中存在的问题进行了分析,提出了改进措施。     

Jute stick extract assisted hydrothermal synthesis of zinc oxide nanoflakes and their enhanced photocatalytic and antibacterial efficacy

In this paper, we used green and hydrothermal methodology to prepare zinc oxide (ZnO) nanoflakes (NFs) with jute stick extract (J–ZnO NFs) as growth substrate. The prepared materials were characterized using different analytical techniques including ultraviolet–visible spectroscopy (UV–vis), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The characteristic absorption peak for ZnO NFs and J–ZnO NFs were observed from the UV–vis spectrum at 373 and 368 nm respectively. The hexagonal wurtzite crystal structure of ZnO NFs and J–ZnO NFs was confirmed by XRD analysis. FESEM and TEM analyses of synthesized J–ZnO NFs confirmed their NFs shape and collectively flower-like structure formation by the assembly of NFs of J–ZnO on cellulose of jute stick extract substrate. The FTIR analysis revealed the functional groups of jute stick extract biomolecules, mainly cellulose, are responsible for the formation of collectivel flower like J–ZnO NFs structure. The XPS analysis revealed the surface and chemical compositions (Zn, C, and O) of J–ZnO NFs. The photocatalytic performance of ZnO NFs and J–ZnO NFs samples was carried out by the degradation of methylene blue (MB) dye solution under UV light irradiation. The degradation efficiency of ZnO NFs and J–ZnO NFs was obtained 79 % and 89 %, respectively, for 5 h. Notably, the degradation efficiency of the J–ZnO NFs was 98 % after 8 h of irradiation, which is very inspiring. The both NFs exhibited first-order kinetics with MB photodegradation. We also examined the possible antibacterial activity of both samples against Escherichia coli (E. coli) pathogens, which demonstrated a significant result with a 17 mm and 19 mm zone of inhibition by ZnO NFs and J–ZnO NFs respectively.     

制动鼓瞬态温度场有限元分析

利用有限元分析软件ANSYS8．1建立了制动鼓的三维有限元模型,对紧急制动工况下制动鼓的瞬态温度场进行分析计算,揭示出紧急制动工况下制动鼓内部温度场分布规律,以及制动过程中制动鼓内部温度随时间变化规律,可为进一步研究制动效能恒定以及客车制动器设计提供参考。     

方形自聚焦透镜的研制

经过方形玻璃丝的加工、离子交换及成品的精密加工等过程,成功制出了方形自聚焦透镜.并采用聚焦成像和雅明干涉等方法对其光学特性进行测试,得出了方形自聚焦透镜本身所具有的一些特性：中心部分畸变较小,成像性能好;四个棱角内的球差较大,像质较差;折射率分布不具有旋转对称性,而是与方向和半径有关.     

固定接触界面切向静弹性刚度问题研究

根据两球体单峰同时受法向、切向载荷时微滑切向应力的分布以及MB模型,给出了界面的总切向接触静弹性条件刚度、总条件法向载荷的解析解。将切向接触静弹性条件刚度的解析解嵌入到有限元软件中,获得了整机的理论模态。以一款八四七厂华中工学院XHK5140型自动换刀计算机数控立式镗铣床上的结合部为研究对象,通过实验对解析解进行了定量验证。研究结果表明：在理论振型与实验振型一致的条件下,界面模型的相对误差在-19．2％～16．8％之间。