罗冰生:优化钢铁工业结构推进增长方式转变

在7月31日召开的中国钢铁工业协会二届七次常务理事(扩大)会议上,中国钢铁工业协会常务副会长兼秘书长罗冰生作了题为《优化钢铁工业结构,推进增长方式转变》的工作报告。报告分析了今年上半年钢铁行业运行情况和下半年钢铁行业发展态势。     

温挤压法制备铝基非晶合金的研究进展

Al85Ni5Y10铝基非晶粉末在603K温挤压所得块体样品的相对密度超过98%, 抗压强度和弹性模量分别高达1470Mpa和145 Gpa, 是传统铝合金的2～3倍, 并有很好的耐磨、耐蚀性能和超塑性等, 可望在航天、航空和汽车制备等领域获得广泛的应用. 然而, 以Al85Ni5Y10为代表的这类铝基非晶合金材料获得工程应用的主要困难在于较难获得大尺寸的非晶材料. 为促进其快速研发, 该文简要地综合介绍和评述了温挤压法制备大块非晶合金的基本原理、方法和研发进展.     

非正弦和不对称负载情况下的功率流向和计费标准

电力系统谐波和不平衡负载增长迅速,影响了电度表的计量,导致了计量电费的不合理现象。若以有功功率的积分为电度量,将造成供电部门的电费损失,这是由于非线性和不平衡负载向系统倒送谐波和非正序功率影响计量以及这些功率在系统中流通增加线损所致。同时,不产生谐波的线性用户却受到谐波和不平衡电流的影响。该文表明,在单相系统中,以基波功率的积分代替全功率的积分作为计量标准,将会消除这两方面的不利影响。在三相系统中,以正序基波功率的积分作为计量标准,同样可以消除这两方面的不利影响。     

Application of Fuzzy-PID Control System in Full-Mechanized Coal Face

The control system, which includes structure, the composition of software and hardware, the form of PID control system and its systematic closed-loop, was used in No.4236 full-mechanized coal face of Xinlongzhuang mine.The typical fuzzy PID control system structure was investigated, and a simplified fuzzy PID control system was taken the place of the complex three-dimension fuzzy controller. Based on the parameter relation between fuzzy controller and normal PID controller, a common method of parameter adjustment of PID controller was summed up and the computer simulation was realized. This system can overcome the problems of large delay, nonlinear, poor running environment and great load change in the full-mechanized coal face. The simulating investigation indicates that the designing method of fuzzy controller is simple and feasible.     

Remanufacturing system based on totally automatic MIG surfacing via robot

Remanufacturing system is a term of green system project which conforms to the national sustainable development strategy. With the demand of the high adaptability of the varieties of waste machining parts, the short product cycle, the low machining cost and the high product quality are offered. Each step of the remanufacturing system from the beginning of the scanning to the accomplishment of the welding was investigted. Aiming at building a remanufacturing system based on totally automatic MIG surfacing via robot, advanced information technology, remanufacturing technology and management, through the control of the pretreatment and the optimization to minimize the time of remanufacturing and realize the remanufacturing on the terminal products of varieties, were applied. The steps mainly include: 1) using the visual sensor which is installed at the end of the Robot to rapidly get the outline data of the machining part and the pretreatment of the data; 2) rebuilding the curved surface based on the outline data and the integrated CAD material object model; 3) building the remanufacturing model based on the CAD material object model and projecting the remanufacturing process; and 4) accomplishing the remanufacture of the machining part by the technology of MIG surfacing.     

6500m~3/h空分设备分子筛纯化器电加热器改造

介绍了6 5 0 0m3 /h空分设备分子筛纯化器新配电加热器电加热管烧断的故障现象,分析了故障原因,后通过增加气体挡板解决了问题;并通过改造,既达到了分子筛纯化再生的技术要求,又实现了电加热器的一用一备     

Effects of Lanthanum on Bone Resorbing Activity of Rabbit Mature Osteoclasts Co-Cultured with Osteoblasts

The effects of lanthanum (Ⅲ) on the bone resorbing activity of rabbit mature osteoclasts (OCs) in the presence of osteoblasts (OBs) were studied in vitro by measuring the number and area of absorption pits. La(Ⅲ) at concentrations ranging from 1.00×10-5 to 1.00×10-8 mol·L-1 show no effect on mature OC number (P＞0.05). In the OC-OB co-culture systems without La(Ⅲ), osteoblasts alone did not influence the pit number and area whether the two kinds of cells were in contact or not (P＞0.05). Under the OC-OB not-in-contact condition, the effect of La(Ⅲ) on the bone-resorbing activity of OCs was similar to that of La(Ⅲ) in the absence of OBs (P＞0.05). However, while OCs were in direct contact with OBs, the inhibitory effects of La(Ⅲ) on OCs' bone-resorbing activity decreased at the concentrations of 1.00×10-5, 1.00×10-6 and 1.00×10-7 mol·L-1, and the promotion effects increased at 1.00×10-8 mol·L-1 (P＜0.05). The results suggest that direct cell-cell contact between OC and OB be essential for OBs to play their role in regulating the response of OCs to La(Ⅲ).     

Control System of Neutral Beam Injection on HT-7

Neutral Beam Injection control system (NBICS) is constructed to measure the plasma current, Magnet current, vacuum pressure, cryopump temperature, control water cooling, filament voltage, and power supply， etc. The NBICS, consisting mainly of a Programmable Logic Controller (PLC) subsystem, data acquisition and processing subsystem and cryopump and vacuum pressure monitoring subsystem, has successfully been used on a NBI device. In this article, the design of NBICS on HT-7 is discussed and each subsystem is described in particular.In addition, some experimental results are reported which are very important data for further research related to the HT-7 tokamak.     

The pumping performances of the turbomoleculae pump simulated by direct simulation monte carlo method

Turbomolecular pumps (TMPs) are used extensively in several highly important areas of industry and research. The performances of TMP are evaluated by maximum throughput and maximum pressure ratio. In this paper, they are investigated by DSMC method. A 3D analysis in a rotating reference frame is proposed to simulate this flow field. Considering the Coriolis and centrifugal accelerations, the equations about the molecular velocities and position are deduced. The VSS model and NTC collision schemes are used to calculate the intermolecular collisions. The diffuse reflection is employed on the molecular reflection from the surfaces of boundary. The procedures for establishment of the correct collision rate are based on the cells, while individual collision pairs are chosen from the sub-cells. The pump performances of one stage TMP under the different kinds of gas, different heights, and different blade angles are simulated and the results are analyzed. Numerical results agree well with the existing experiment data.     

锡钢电力负荷节能软件装置-DSM的应用

钢厂等主要用电单位的峰值负荷造成电力资源浪费、供电紧张及企业自身高成本用电。锡钢集团电力负荷需求侧控制(DSM)项目，应用“趋势分析”原理，通过调控主要用电设备电弧炉的手段，使用电负荷均衡运行，从而使电力负荷(需量)下降5022 kW(10％)左右，对用电大户负荷控制(DSM)，节约用电费用，缓解城市供电压力，提供了有益的途径。