SELF-DIFFUSION IN IRON-50% COBALT ALLOY

用剩余强度法测定了Fe~(55)及Co~(60)在铁-钴(50％)合金中850--980℃α-区域内的自扩散系数,结果分别为 D_(Fe)=0.26 exp(—55,600/RT)厘米~2/秒, D_(Co)=14 exp(—65,000/RT)厘米~2/秒。 激活能测定数值与用准化学理论分析结果符合较好。     

河口海岸生态环境研究现状 及发展趋势

在广泛查阅国内外关于河口海岸生态问题研究相关文献基础上,综述了河口海岸侵蚀治理研究、河口地区水质研究和河口湿地的恢复与重建等三个热点方向的研究现状。进而,根据研究现状和我国河口海岸研究的实际需求,对海岸侵蚀,河口水质恢复和湿地保护等有关河口生态环境的研究方向进行了展望。     

Analysis of operating policies for manufacturing cells

We present an analytical model for error-recovery problems of unitary production cells and develop a framework for economic justification. Each production cell has its own machine and functional characteristics (e.g. precision, speed, operating cost). Each alternative operating policy of error-recovery for a production cell leads to a different system throughput, scrap rate, and required quantities of parts. However, error recovery cannot be accomplished without in-process inspections. Thus, the central problem discussed in this paper is to maximize profits or throughput rate by selecting an appropriate production cell along with an optimal set of inspection and error recovery policies.     

过氧钼酸离子液体合成及催化性能

以N-甲基咪唑、氯代正辛烷、钼酸钠和过氧化氢为原料合成了3-辛基-1-甲基咪唑过氧化钼酸盐离子液体[C_8MIM]_2[Mo_2O_(11)],通过核磁氢谱、核磁碳谱、红外、元素分析对产物的结构进行表征。考察了该功能化离子液体对二苯并噻吩的催化氧化性能,通过单因素分析确定了萃取耦合催化氧化脱硫的最佳实验条件:萃取剂与模拟汽油的体积比1∶5,氧硫摩尔比6∶1,催化剂用量5 g/L模拟汽油,40℃下反应30 min。在此条件下能使起始硫含量为500μg/m L二苯并噻吩/异辛烷模拟汽油降低到10μg/m L以下,脱硫率高达98.83%。考察了该体系循环使用性能,经过16次重复使用,脱硫率仍在98.4%左右。     

单矿物黏土对聚羧酸减水剂分散性的影响与机理

研究了4种单矿物黏土(钠基蒙脱土、钙基蒙脱土、伊利土、高岭土)对掺聚羧酸减水剂水泥净浆流动度的影响,测定了单矿物黏土的水-黏土质量比及其对聚羧酸减水剂的吸附量,以及在此基础上单独补偿水或减水剂后单矿物黏土对聚羧酸减水剂分散性能的影响.结果表明:补偿水或聚羧酸减水剂之后,基本可消除伊利土、高岭土对水泥净浆流动度的影响,但蒙脱土的影响仍显著存在;对吸附了聚羧酸减水剂的单矿物黏土进行的红外光谱、X射线衍射分析表明,蒙脱土对聚羧酸减水剂的层间吸附是导致其对聚羧酸减水剂吸附量和聚羧酸减水剂分散性的影响比其他单矿物黏土大的主要原因.     

基于Sagnac干涉的光纤对冲床脉动电流计量技术的研究

基于Sagnac干涉原理的全光纤光电互感器具有响应特性好、精度高、安全性好的特性,是解决脉动电流测量的新技术之一。以J21-40T普通冲床为研究对象,应用光波的偏振性和法拉第磁光效应理论,探究了全光纤光电互感器测量冲床脉动电流的工作机理。通过对Sagnac调制技术的全面分析,设计了系统框图。借助测量数据,阐述了测量重复性、温度变化、1／4波片、Verdet常数误差。研究结果表明：这一技术可以普遍用于冲床脉动电流的准确测量,是一种有效的大电流计量技术。     

增量式函数观测器对输入端不确定性有界扰动的稳定鲁棒性分析

观测器的稳定性证明是观测器存在的根本依据，文中在增量式函数观测器IFO-KDx成立的充要条件的基础上，探讨由于受控对象的固有特性(如不确定性、慢时变性等)使得IFO-KDx的充要条件不能给予严格保证时，其渐近稳定关系的变化。通过数学分析，论证IFO-KDx对于输入端存在不确定性有界扰动时的稳定鲁棒性。理论分析和工程实践均证明了，采用IFO-KDx设计状态反馈控制系统，不仅具有适用性和实用性，而且比起普通观测器具有较好的稳定鲁棒性，从而为观测器理论在控制工程中的创新与推广应用提供了一个重要的理论依据。 关键词： ；状态反馈控制；；；；     

联苯乙酸的新合成工艺研究

以对氯苯乙酮为起始原料,采用对空气和潮气稳定的水溶性钯(Ⅱ)催化剂在纯水中100℃下,通过Suzuki偶联合成联苯乙酮,再经Willgerodt-Kindler反应制得联苯乙酸。通过考察温度、时间、碱、催化剂和物料比等因素对两步反应的影响,确定了合成联苯乙酸较为理想的工艺条件。产品总收率71.6%。     

Experimental Investigation of Capacity Control Scheme on System Performance for a Machine Tool Cooler

Highly accurate manufacture in machining industry can only be obtained with precise temperature control of the coolant (oil or water).Machine tool with more accurate,stable and advanced the precision of the working component cannot be developed without appropriate cooling.However,the machine tool coolers are facing the control hunting of cooling temperature and the dramatic variation of heat load in high-accuracy machining.The main objective of this study is to evaluate the influence of the hot-gas by-pass scheme and suction regulation for capacity control of a machine tool cooler system.In this study,experimental investigation on both hot-gas by-pass scheme and suction valve regulation for capacity control has been proposed.Effects of using capillary tube and thermostatic expansion valve along with different capacity control scheme have been investigated extensively in an environmental testing room.Cooling performance and power consumption of the cooler system have been measured and analyzed as well by comparing with different opening percentage of throttling valve under specific coolant temperature.The experimental results reveal that the power consumption will reduce slightly by capacity control using the hot-gas by-pass scheme but the coefficient of performance (COP) of the overall system will decrease.Lower coolant temperature will result in higher compressor power consumption as well.While conducting suction valve regulating for capacity control,energy-saving at 10%-12% can be obtained by using thermostatic expansion valve under different evaporator load.It also reveals that suction valve regulation along with adequate choice of thermostatic expansion valve can provide alternative choice for steady capacity control and substantial energy-saving.The proposed cooler systems with different capacity control schemes are not only more cost-effective than inverter driven system,but also can perform energy-saving and precise temperature control specific for high-accuracy machine tool cooling.     

铝冶炼供电系统节能降耗的措施

湖北丹江哆嗦业公司三期技改工程供电整流系统采用了较多的新技术，新设备，新工艺，在该前提下，对运行参数进行详细研究，达到合理利用电能的目的，同时采用全面质量管理工作的方法，成功地改善了电流的稳定性，减少了设备停运率，为安全生产提供了有力的保障，达到了节能降耗的目的，取得了一定的经济效益。