Three-dimensional porous composite framework assembled withCuO microspheres as anode current collector for lithium-ionbatteries

The surface structure and material composition of current collectors have significant effects on the electrochemical performances of lithium-ion batteries(LIBs). In this work, a three-dimensional(3D) porous composite framework is applied as the anode current collector in LIBs. This unique 3D skeleton is composed of conductive carbon fiber/Cu core/shell fibrous structure. With an oxidation treatment upon the copper shell, the porous framework is assembled with CuO microspheres. Using mesocarbon microbead(MCMB) graphite powders as the active material, the cell with this 3D porous composite current collector shows an improved reversible discharge-charge capacity of 415 mAh g~(–1) at a current rate of 0.1 C after 50 cycles, which is much higher than that of the cell with a flat Cu foil(127 mAh g~(–1)). It is demonstrated that this unique fibrous network of the 3D current collector coupled with the morphological effects of the CuO microspheres greatly improve the cell performance in terms of electrical conductivity, reversible capacity and cycling stability.     

An optimal feedrate model and solution algorithm for a high-speed machine of small line blocks with look-ahead

In complex high-speed machining of consecutive small line blocks, the tool path segments can be so short that a machining center moving at a high feedrate cannot accelerate or decelerate fast enough to make direction changes accurately. Aiming at adjusting the feedrate automatically to achieve maximum productivity, this paper present a novel mathematical model considering the key and representative factors, and then based on it, propose an algorithm to seek the approximate optimal feedrate by evaluating the toolpath ahead. Simulation results demonstrate the machine using the proposed model and algorithm can go fast where possible and to slow down just enough where needed and the productivity can be improved dramatically.     

消失模铸造铸铁件水基涂料的研制

选用石英粉为耐火骨料，酸式磷酸盐为粘结剂，通过正交试验确定了铸铁件消失模水基涂料的最佳配比。经测试和生产验证，其性能良好，能很好地适应生产要求。     

絮凝体的物理特性

从絮凝体的密度,空隙率、絮凝体的粒径分布,絮凝体的强度以及絮凝体的分形维数五个方面综述了絮凝体的物理特性及结构特性,分析了影响絮凝体物理特性的因素。     

电无级变速器的内燃机最佳效率控制

通过对混合动力汽车电无级变速器传动机构原理分析,提出一种内燃机最佳效率控制策略。该策略主要是基于底层控制系统的硬件结构,根据上位机发送的指令对双机械端口电机的内转子进行转矩控制,实现内燃机最佳效率运行;对外转子进行转速控制,满足车辆运行需求。并且给出了该策略下转矩辨识的方法;同时给出在整车中车辆总成控制与双机械端口电机控制系统和其他系统配合关系。通过实验,验证了该控制策略可以实现内燃机最佳效率运行同时满足负载侧连续平滑调速的可行性。     

关于住宅坡屋顶的思考

对近几年各城市住宅建设中出现的坡屋顶热进行了分析,认为住宅设计中采用坡屋顶有其客观必然性和现实意义;⑴美化住宅造型,改善城市景观形象;⑵提高住宅屋顶的防水性能,增强住宅商品的耐久性;⑶有较好的保温隔热能力,利于建筑节能;⑷带动新型建材产业的发展。对住宅设计中采用坡屋顶形式、改善住宅整体功能和美化城市形象、实现人居环境的可持续发展等提出4点建议和意见。     

Experimental investigation and numerical simulation of large-sized aluminum tube extrusion forming

Large-sized aluminum tube has big section effect, aspect ratio and thin thickness, so that the extrusion technology is complex and the large specific pressure is generated in extrusion cavity. The temperature variation and velocity effect is difficult to control. The extrusion forming of large-sized aluminum tube was researched and simulated. Three-dimensional thermo-mechanical coupled finite element model was constructed and appropriate boundary conditions were given out. The results show that large-sized aluminum tube can be formed by isothermal extrusion through controlling the extrusion velocity and founding the relationship between extrusion velocity and extrusion temperature.     

NOET合成方法的改进及其99Tcm标记

本工作主要在ＮＯＥＴ的合成方面做了一些改进,制备出纯度高,稳定性较好的ＮＯＥＴ的钾盐,并探讨了影响＾９９Ｔｃ＾ｍＮ－ＮＯＥＴ标记率的相关因素,由此得出最佳标记条件。在此条件下,＾９９Ｔｃ＾ｍＮ－ＮＯＥＴ的标记率可稳定在９０％以上。     

南钢1号连铸机高效化改造实践

叙述了南钢 1号连铸机高效化改造实践 ,总结了改造经验 ,改造的关键部位是结晶器、振动装置、二次冷却装置、拉矫装置、冷却水系统