本文用水热法成功制备了微米级铁酸铋晶粒。在前驱体浓度大于2.5 mmol/L,矿化剂浓度大于10 mmol/L的条件下,可以得到纯相铁酸铋Bi Fe O_3。研究了晶粒尺寸对铁酸铋光催化性能的影响。结果表明:时间及温度对Bi Fe O_3相结构没有影响,但...本文用水热法成功制备了微米级铁酸铋晶粒。在前驱体浓度大于2.5 mmol/L,矿化剂浓度大于10 mmol/L的条件下,可以得到纯相铁酸铋Bi Fe O_3。研究了晶粒尺寸对铁酸铋光催化性能的影响。结果表明:时间及温度对Bi Fe O_3相结构没有影响,但在一定程度上会影响产品的粒径,保温时间越短,铁酸铋晶粒尺寸越小,其光催化性能就越好。展开更多
针对目前汽车装配监视生产线仍需人工作业、工作步骤繁琐以及效率不高的情况,设计了基于西门子S7-1200 PLC和西克射频识别(Radio Frequency Identification,RFID)技术的装配监视追溯系统。详细介绍了该系统的基本结构,系统实现了生产现...针对目前汽车装配监视生产线仍需人工作业、工作步骤繁琐以及效率不高的情况,设计了基于西门子S7-1200 PLC和西克射频识别(Radio Frequency Identification,RFID)技术的装配监视追溯系统。详细介绍了该系统的基本结构,系统实现了生产现场自动采集和写入仪表信息,上位机集中监视现场装配状况,同时将数据库中的仪表信息接入汽车厂制造企业生产过程执行管理系统(Manufacturing Process Execution Management System,MES),为汽车零/部件追溯和故障召回提供数据支持。该系统已在长春某汽车厂正式投入使用6个月,实践应用表明,该系统提高了工作效率,运行平稳,采集仪表底盘号成功率在99%以上,取得了良好的预期效果。展开更多
We study the dynamics of spin autocorrelation function and the non-equilibrium decay of magnetization in the Criffiths phase of randomly site diluted Ising magnetic systems by Monte Carlo simulation. The results show ...We study the dynamics of spin autocorrelation function and the non-equilibrium decay of magnetization in the Criffiths phase of randomly site diluted Ising magnetic systems by Monte Carlo simulation. The results show that the relaxations are non-exponential for both two- and three-dimenslonal diluted Ising magnetic systems. At a long timescale, the asymptotic dynamics of the spin autocorrelation function C(t) behaves in the form of C(t) ~ exp{-A(lnt)^d/d-1}, expected by the theoretical prediction based on clustering arguments. Furthermore we show that the evolution of the spin autocorrelation function satisfies rather well a stretched exponential form of C(t) ~ exp{-(t/t)^β} even at quite small timescales.展开更多
文摘本文用水热法成功制备了微米级铁酸铋晶粒。在前驱体浓度大于2.5 mmol/L,矿化剂浓度大于10 mmol/L的条件下,可以得到纯相铁酸铋Bi Fe O_3。研究了晶粒尺寸对铁酸铋光催化性能的影响。结果表明:时间及温度对Bi Fe O_3相结构没有影响,但在一定程度上会影响产品的粒径,保温时间越短,铁酸铋晶粒尺寸越小,其光催化性能就越好。
文摘针对目前汽车装配监视生产线仍需人工作业、工作步骤繁琐以及效率不高的情况,设计了基于西门子S7-1200 PLC和西克射频识别(Radio Frequency Identification,RFID)技术的装配监视追溯系统。详细介绍了该系统的基本结构,系统实现了生产现场自动采集和写入仪表信息,上位机集中监视现场装配状况,同时将数据库中的仪表信息接入汽车厂制造企业生产过程执行管理系统(Manufacturing Process Execution Management System,MES),为汽车零/部件追溯和故障召回提供数据支持。该系统已在长春某汽车厂正式投入使用6个月,实践应用表明,该系统提高了工作效率,运行平稳,采集仪表底盘号成功率在99%以上,取得了良好的预期效果。
基金Supported by the National Science Foundation of China under Grant No 10574049.
文摘We study the dynamics of spin autocorrelation function and the non-equilibrium decay of magnetization in the Criffiths phase of randomly site diluted Ising magnetic systems by Monte Carlo simulation. The results show that the relaxations are non-exponential for both two- and three-dimenslonal diluted Ising magnetic systems. At a long timescale, the asymptotic dynamics of the spin autocorrelation function C(t) behaves in the form of C(t) ~ exp{-A(lnt)^d/d-1}, expected by the theoretical prediction based on clustering arguments. Furthermore we show that the evolution of the spin autocorrelation function satisfies rather well a stretched exponential form of C(t) ~ exp{-(t/t)^β} even at quite small timescales.