一种有机膨润土润滑脂的性能研究

以有机膨润土、HVI400矿物基础油、添加剂和极性助分散剂为原料,实验研究一种有机膨润土润滑脂,较详细地考察了极性助分散剂、添加剂及制备工艺（搅拌速度、搅拌时间、研磨次数）对膨润土润滑脂性能的影响.实验结果表明极性助分散剂采用丙酮时制备的膨润土润滑脂性能良好;液态添加剂比固体添加剂的效果好;制备工艺对膨润土润滑脂的性能有一定影响.采用15%有机膨润土稠化剂和85%HVI400矿物基础油,以2%-4%丙酮作极性助分散剂,添加0.5%抗氧剂、0.5%防锈剂、1%油性剂和4%极压抗磨剂,制备工艺为快速搅拌30 min,研制出一种性能良好的极压膨润土润滑脂,该润滑脂具有良好的高温性、胶体安定性、机械安定性、防锈性、抗水性和极压抗磨性.     

THE 3rd PAN-AFRICAN PARLIAMENT SESSION

Frustrated by decades of authoritarian rule, political repression, economic mismanagement, poverty, soaring unemployment and other related injustices, the youth in Tunisia, Egypt and Libya rose up against the state, while Algeria and Morocco narrowly escaped the events of the so-called ‘Arab Spring’. This quest for political reform is an indication of a great collective shift that has the potential to reverberate throughout the African continent. However, to what extent can the youth succeed in bringing about the much-desired transition to democracy? This article focuses on the North African youth uprising and the quest for political reform in Africa. It examines the core issues of the youth uprising and the challenges to the attainment of political reform. A youth uprising can lead to genuine political reform if the major challenges in building new democratic forms of governance which can address economic disparity, protection of human rights, justice and security, can be overcome.     

论开发西北地区资源环境与兵团应采取的对策

西北作为资源开发主导型地区 ,矿产资源和水资源在开发利用过程中 ,存在一系列问题。兵团在新疆具有举足轻重的地位 ,应该协调该地区资源开发与环境保护 ,在可持续发展道路中采取相应的对策。     

超细矿物微粉改善2号坦克润滑脂摩擦学性能研究

采用球盘式摩擦磨损试验机，研究了羟基硅酸盐超细矿物微粉作为2号坦克润滑脂添加剂对钢／钢摩擦副的润滑性能，利用扫描电子显微镜（Scanning Electron Microscopy，SEM）和X射线能谱仪（Energy Dispersive Spectrometry，EDS）分析了磨痕表面形貌及典型元素的面分布情况。结果表明：超细矿物微粉可显著改善2号坦克润滑脂的抗磨减摩性能，含2wt％矿物微粉的润滑脂同单一2号润滑脂相比，摩擦系数降低了约44％，钢盘磨损率降低了约70％，这与羟基硅酸盐可在摩擦表面形成一层富含O，Si，Mg，Al等元素的摩擦表面膜密切相关。     

我国西部矿产资源可持续发展利用研究

我国西部矿产资源丰富,矿产资源开发利用中存在的问题,提出了西部矿产资源可持续开发利用的正确途径.