高速、超高速磨削与超硬磨料砂轮及其修整的研究

论述了高速、超高速磨削的发展现状及其关键技术．介绍了国际上制备单层钎焊超硬磨料砂轮新技术，设计了一套在线闭环控制系统，以声光调QYAG激光烧蚀修整超硬磨料砂轮，并进行了试验，结果表明这是切实方便可行的有效方法．     

Mirror SUrface Grinding of Steel Bonded Carbides

The steel bonded carbide, a composite material, is very difficult to be machined to a fine finish mirror surface. In this paper, an electrolytic in-process dressing (ELID) grinding with metallic bond super-hard abrasive wheel was developed for grinding steel bonded carbide GT35. Factors affecting ELID grinding performance were analyzed by an atomic force microscope (AFM). Based on the analysis of AFM topography of the fine ground mirror surface of the steel bonded carbide, a schematic diagram of the mechanism of micro-removal of the ground surface was described. The AFM topography also shows that the hard brittle carbide particles, on the surface of steel bonded carbide, were machined out by ductile cutting. Since the grinding cracks in the ground surface are due to temperature gradient, temperature distribution in the grinding area was analyzed by finite element method (FEM). Experimental results indicate that a good mirror surface with Ra<0.02pm can be obtained by the developed ELID grinding system.     

浅谈铁选矿项目的环境影响评价

随着铁选矿项目的急剧增加,铁选矿项目的污染已成为公众关心的问题,受到政府管理部门的高度重视。根据该项目尾矿砂产生量较大的实际情况,在环评中应重点评价尾矿库选址、尾矿库容计算和尾矿坝的设计施工及尾矿库风险分析、生态保护等内容,为环境管理部门决策提供技术支持。     

图C_m∨W_n的点可区别边色数

对于图G的一个k-正常边染色,若满足不同点所关联边色集合不同,则称此染色法为点可区别边染色法.其所用最少颜色数称为该图的点可区别边色数.得到了图与轮的联图的点可区别边色数.     

热黏合工艺对医用非织造敷料产品性能的影响

以聚乳酸纤维、木棉和超吸水纤维的混和针刺层作为里层,麻赛尔纤维和聚丙烯纤维的混和针刺层作为表层,采用热黏合技术进行复合,制备医用复合敷料.考察了热黏合工艺中的黏合温度、输送速度和黏合压力等工艺参数对产品性能的影响.实验结果表明,当黏合温度为130℃、输送速度为3.8 m/min、黏合压力为0.03 MPa时产品性能最优.     

Fuzzy logic based automatic slip control system for agricultural tractors

In this study, a fuzzy-based automatic slip control system was developed for agricultural tractors. The developed system continuously measures the amount of slip that occurs during the tillage activities and automatically changes the operation depth of tillage equipment according to the amount of increase in the slip value. The amount of slip occurring on the driving wheels was applied as a separate input to the designed fuzzy control system (FCS) and at the fuzzy rule base, it was decided how much the depth of tillage would be reduced. The system was mounted on an agricultural tractor and trials were carried out in actual field conditions. The results of the tillage trials performed with the developed FCS were compared separately with the results of the tillage trials performed with an operator control (OC) without using any automatic control system. As a result of the trials, compared to the operator control, it was determined that in the tillage activities carried out with FCS, there were 42% decreases in slip values, 30% decreases in draft force values, 44% decreases in fuel consumption values and 5% increases in field work performance values. It was also observed that there were 10% changes in tillage depth.     

电镀镍钴合金多层磨粒砂轮电解修整机理

修整是多层电镀超硬磨粒砂轮精密磨削的关键技术之一.电镀镍钴合金硬度和强度高,是理想的超硬磨料砂轮结合剂;但同时也导致砂轮修整困难.为此对镍钴合金镀层的电解修整机理进行了研究.首先,根据标准电极电位的理论分析了镍钴合金电解修整的可行性;然后,采用电化学分析仪测试了镍钴合金镀层在NaNO3溶液中的极化曲线,表明极化曲线存在钝化区;最后,进行了电解修整镍钴合金镀层CBN砂轮试验,结果表明对于2V和5V的电解修整电压,较高的电解电压有利于电镀镍钴合金超硬磨料砂轮电解修整.     

六轮驱动无人装甲车动力性参数设计与仿真

针对陆基武器装备发展需求,研究了一种基于六轮独立驱动装甲车辆,对其整车基本结构、轮毂电机性能、动力电池容量和整车续驶里程等参数进行匹配设计。采用ADVISOR建立轮毂电机独立驱动型装甲车辆动力系统模型,并对其进行了仿真分析。然后通过自行设计的装甲车辆样车进行了实车试验。最终对样车试验数据与仿真结果进行对比分析,验证了该装甲车辆动力性参数匹配设计的合理性,为以后军用无人装甲车辆的设计与研究奠定一定的理论基础。     

Slow release of wound healing drug from hydrogel wound dressing prepared by radiation crosslinking method

The hydrogel wound dressing was prepared by radiation crosslinking. It was used of on patients in the Navy 411 Hospital and some other hospitals. From sixty case studies of the clinical effects, the results showed that: 1. drug releasing slowly releives the pain effectively for prolonged period of application; 2. The dressing can reduce the oozing liquid from the wound and make the wound heal faster; 3. The number of the dressing change is greatly reduced. All the data indicates that the dressing is superior to the conventional kinds.