非等间距GM模型及其在柴油机磨合试验数据中的应用

本文分析了两种非等间距GM（1，1）模型，给出了其精度检验的方法，并将其用于柴油机磨合油光谱试验数据的拟合与预测，得出了一定的结论，最后采用两次参数拟合法进一步提高了非等间距GM（1，1）模型的精度。     

Synthesis, characterization, and dielectric properties of Ba(Ti1−xSnx)O3 nanopowders and ceramics

We prepared Ba(Ti_1−xSn_x)O₃ powders and ceramics by means of the sol-gel process, with dibutyltin dilaurate as the Sn precursor. The samples were characterized by means of Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy, and also determined the dielectric properties of the ceramics. The powders synthesized by means of the sol-gel process had a grain size on the nanometer scale, with the grains mainly composed of a cubic BaTiO₃ phase. Sn can disperse into BaTiO₃ more uniformly in the sol-gel technique using dibutyltin dilaurate as the Sn precursor. With increasing Sn concentration, the grain size of the Ba(Ti_1-xSn_x)O₃ ceramics increased and the maximum dielectric constant (?_max) first increased and then decreased. At a Sn concentration of 5 mol%, ?_max reached its maximum value (19,235).     

Investigation on High Power Diode Laser Cladding of Ni-Fe-Cr Based Alloy Coatings

Appropriate laser cladding processing parameters for a Ni-Fe-Cr based alloy coating with good quality were studied using 3.5 kW diode laser.The characterization of the coating was investigated,and the influence of each parameter was analyzed.The mechanical properties and wear resistance of the coating were compared with the corresponding chemical composition wrought and cast materials.The results showed that a coating with aspect ratio about 3,dilution ratio 8%-10%and wetting angle 35o-50°could be formed with the laser power 1200-1500 W,travelling speed 8-10 mm/s,powder feed rate 16-18 g/min and shield gas flow 15 l/min.The tensile strength of the coating reached 953 MPa which was higher than that of wrought material 918 MPa and cast material 830 MPa.The microhardness of multi-layer coating was higher than that of single layer coating.The wear resistance of the coating was at the same level with the wrought and cast materials.     

现代汽车发动机轴承的环保、节能及可靠性

发动机轴承及其润滑系统与现代汽车环保、节能及可靠性密切相关。介绍了无毒轴承材料的研制和应用;润滑油的净化、再生技术,并给出了具体应用数据。     

轴瓦疲劳试验机的研制

分别从硬件和软件2部分分析了轴瓦疲劳试验机的结构,简要阐明了它的工作原理、硬件设计方案及其控制软件的各个模块。为了保证试验轴瓦能够受到正弦单脉冲载荷,试验头采用偏心轴段结构,满足了设计要求;试验机控制软件以LabVIEW为设计平台开发,能够根据不同的要求进行快捷修改,从而降低了后续试验机的开发周期和成本。     

采用连铸矩形坯生产290mm薄板坯工艺实践

介绍了安钢φ65mm轧机用180×260mm连铸矩形坯试制开发290mm薄板坯生产工艺方案,并针对试生产过程中存在的问题进行改进,取得显著效果。     

彭阳地区砂岩型铀矿反射地震特征分析

彭阳地区位于鄂尔多斯盆地西南缘,是北方砂岩型铀矿的重点勘察区域.利用现有的地质和测井资料,在前人研究的基础上,针对研究区的二维地震资料进行叠后地震属性分析,描述了砂岩型铀矿的地震响应特征.通过对基于模型的波阻抗反演方法得到的地震波阻抗反演剖面进行精细解释,并在此基础上对本区的砂岩型铀矿的形成环境和富集特征进行分析.通过...     

A comparative study of laser beam welding and laser-MIG hybrid welding of Ti-Al-Zr-Fe titanium alloy

Ti-Al-Zr-Fe titanium alloy sheets with thickness of 4 mm were welded using laser beam welding (LBW) and laser-MIG hybrid welding (LAMIG) methods. To investigate the influence of the methods difference on the joint properties, optical microscope observation, microhardness measurement and mechanical tests were conducted. Experimental results show that the sheets can be welded at a high speed of 1.8 m/min and power of 8 kW, with no defects such as, surface oxidation, porosity, cracks and lack of penetration in the welding seam. In addition, all tensile test specimens fractured at the parent metal. Compared with the LBW, the LAMIG welding method can produce joints with higher ductility, due to the improvement of seam formation and lower microhardness by employing a low strength TA-10 welding wire. It can be concluded that LAMIG is much more feasible for welding the Ti-Al-Zr-Fe titanium alloy sheets.     

内燃机状态监测油料分析技术及其应用

机械设备状态监测的主要对象是机器中的主要摩擦副及其磨损过程。实践表明，油料分析技术是准科学的经济效益特别显著的磨损监测技术。建立油品理化分析、油料充谱分析、油料所含磨粒的铁谱分析以及润滑系统污染度检测的综合系统分析方法是最可取的方法。     

工地环保监测与除尘技术研究与应用

随着我国经济快速增长,建筑行业的发展非常迅速,同时,也带来一些负面影响。其中,影响较大的莫过于环境污染问题,为此,工地环保监测与除尘联动技术应运而生。该技术针对建筑工地特殊环境进行专业设计,结合互联网+、大数据、云平台等当今先进技术,从源头进行监测,并采用水射流技术进行高效雾化水颗粒,使雾滴吸附粉尘颗粒,有效压制粉尘,降尘效果十分明显,能够最大限度地降低建筑工地环境污染,以达到预期的环保效果。