Improvement of Wear Resistance of Magnesium Alloy AZ91HP by High Current Pulsed Electron Beam Treatment

MAGNESIUM ALLOYS exhibit high strength toweight ratio and stiffness and are finding theirapplications in air,automobile and electronic industries.Despite the worldwide growing interests inmagnesium alloys,their inferior wear resistance is aserious impediment.Considering that wear is asurface-related behavior,surface modification canresolve the problem.Recently,intense and pulsed energetic beams areemerging as new and effective methods for surfacemodification.The High Current Pulsed Ele…     

绿色设计理论方法在静电涂油机中的应用

本文先简要的介绍了绿色设计的概念和特点，然后综述了绿色设计的内容和方法，在分析了绿色设计方法在静电涂油机中的运用后，指出绿色设计是机械制造行业发展的必然趋势。     

多次孕育处理在球墨铸铁管离心铸造中的应用

在离心铸造球墨铸铁管生产中，为防止共晶渗碳体析出，改善球化，增加石墨球数，提高力学性能，采用了三次孕育：（1）包内孕育；（2）浇注时随流孕育；（3）型内孕育。取得了较好的孕育效果。     

偶氮氯膦Ⅰ光度法同时测定硅砂中氧化钙和氧化镁

试验了Ca2 、Mg2 与偶氮氯膦Ⅰ同时显色的条件,Ca2 、Mg2 对显色的相互影响。试验结果表明,100μg CaO(50 ml)存在下,不影响MgO的显色,0～50μg MgO(50 ml)符合比耳定律,相关系数r=0.999 8,表观摩尔系数ε=1.83×104 L/mol.cm。30μg MgO(50 ml)存在下,不影响CaO的显色,0～100μg CaO(50 ml)符合比耳定律,相关系数r=0.999 1,表观摩尔系数ε=1.53×104 L/mol.cm。建立了偶氮氯膦Ⅰ光度法同时测定硅砂中CaO、MgO的方法。用所建立的方法对硅砂标准样品进行测定,结果十分满意。     

基于Agent反、正向招投标技术的Job Shop调度研究

分析了目前基于多Agent技术的Job Shop调度研究所存在的问题，对Job Shop调度问题进行了形式化描述，给出了基于多Agent的总体调度结构和调度过程，提出了基于柔性工艺路线的虚拟制造单元和Agent的反、正向招投标调度机制，描述了具体实现过程，给出了招标、投标、评标的参数和指标，通过示例验证了该方法的有效性。所提方法在Agent招投标中直接考虑了工序任务间的约束和联系，即充分发挥了多Agent系统分散决策的优势，又从根本上避免了任务分配的冲突，提高了调度效率。     

Preparation and characterization of TiO2 photoelectrode codoped with aluminum and boron and its application in dye-sensitized solar cell

Nanocrystalline titania films codoped with aluminum and boron were prepared by cathodic vacuum arc deposition. In the process, titanium alloy target was used under an O2/Ar atmosphere, and sensitization of films were carried out by natural dye-sensitized complex in anhydrous ethanol. The structure, surface morphology and UV-vis spectra of titania films codoped were measured by X-ray diffraction analysis, scanning electron microscopy and ultraviolet-visible spectrometer. Theas-deposited films are found to be amorphous. The films annealed were examinedto be of anatase structure with orientation along the (101) planes, the averagecrystal size is in the range between 41 and 45 nm. SEM results show that thereare some pores in the codoped titania films, the optical properties of the dye-sensitized films were also measured which reveals that the spectral responses of films shift to the visible region. Under simulated sunlight illumination, the overall energy conversion efficiency of dye-sensitized nanocrystalline solar cell is 0.9%.     

运用复合剂制备WC颗粒增强钢基表面复合材料

以ZG310-570为基体、WC颗粒为增强相,在普通水玻璃石英砂干型、无负压条件下,运用自制的复合剂,制备出WC颗粒增强钢基表面复合材料.抗磨料磨损性能是含20%Cr高铬铸铁的3.30倍.硬度可达60HRC以上.铸件表面平整光洁,尺寸精度大为提高.合金层厚度均匀,可达8mm,且与基体之间结合良好.     

管道缺陷漏磁场和缺陷尺寸关系的研究

针对油气管道腐蚀缺陷定量分析精度很难提高的现状，根据腐蚀缺陷评价标准，定义缺陷外形尺寸，设计现场检测试验，并制作大量不同类别的样本缺陷用于实际检测试验。分析了大量缺陷漏磁场数据，选取了量化缺陷外形的漏磁场特征，给出了缺陷外形和漏磁场特征的关系曲线。试验得出这些特征可有效量化缺陷外形尺寸。     

含交错层叠电涡流传感器阵列的成像定位仪的研究

针对被遮盖的金属物体的可视化问题进行了研究探讨,采用交错层叠柔性电涡流传感器阵列替代线圈式电涡流传感器阵列,利用CCD摄像头拍摄遮盖物表面图像,实现金属物体与遮盖物表面的同步显示,并采用打印机将金属物体上螺纹孔中心位置标记在遮盖物表面相应位置。所研究的探测成像定位仪具有更高的定位精度,操作更简单,使用更方便。     

Fabrication of ZnO films by radio frequency magnetron sputtering and annealing

ZnO thin films were deposited on Si（111） substrates through a radio frequency （rf） magnetron sputtering system. Then the samples were annealed at different temperatures in air ambience and ammonia ambience respectively. The structure and composition of the ZnO films were studied by X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. The morphology of the samples was studied by scanning electron microscopy （SEM）. Measured results show that ZnO films with hexagonal wurtzite structure were grown on Si（111） substrates when annealed in the two ambiences. The volatilization process of ZnO in the ammonia ambience at high temperature was discussed and the mechanism of the reaction was analyzed.