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HAN Ji-Feng ZHANG Jia-Wen CHEN Jin ZHANG Qing-Min LIU Qian XIE Yu-Guang QIAN Sen MA Lie-Hua 《中国物理C(英文版)》2008,32(5)
The installation of the BESⅢ RPC system has been completed.Cosmic ray test results show that they perform very well in streamer mode and meet the BESⅢ requirements.We have tested several RPCs in the avalanche mode with the addition of extra SF6 in the gas mixture.We find an efficiency plateau that reaches~95%.and a time resolution of 1.8 ns.This demonstrates that the BESⅢ-type RPC can work in the avalanche mode as well. 相似文献
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Investigation of calculation method for anti-penetration of reactive power steel fiber concrete (RPC) 总被引:7,自引:0,他引:7
为了解决评估超高强活性粉末钢纤维混凝土的抗侵彻能力问题,根据混凝土在弹体侵彻过程中的介质状态及能量的分配关系,揭示了侵彻近区耗散能量结构与破碎区之间的比例尺度关系。由于近区介质的运动特性变形接近一维应变状态,受力类似于流体动力学状态,据此推导并简化了具有宽广的适用范围的侵彻计算公式,认为侵彻的深度主要由弹体的质量、形状、速度及靶体的强度、密度、断裂韧度、变形波速决定。通过多次的实弹试验,验证了公式的可靠性,得到了RPC的抗侵彻能力是普通混凝土的3倍的结论。 相似文献
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QIAN Sen WANG Yi-Fang ZHANG Jia-Wen LI Jin CHEN yuan-Bo CHEN Jin WANG Zhi-Gang MA Lie-Hua 《中国物理C(英文版)》2009,33(9)
The BESⅢ RPC with Gd coating as thermal neutron detector was designed and constructed. Three prototypes were built with different techniques of producing the gadolinium converter. The performance of the cosmic ray test, the signal and the radiation spectrum were discussed in this paper. Lastly, the efficiency of one prototype with the best performance for detecting the thermal neutron was tested as 8.7%. 相似文献
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A prototype RPC with position resolution less than 1 mm has been produced and studied. Based on this RPC detector, the effect of the width of the integrated FADC time window on the position resolution of a RPC has been studied experimentally and theoretically. The results of theoretical calculation and experimental measurement have shown good agreement. 相似文献
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The BESⅢ ·RPC with Gd coating as thermal neutron detector was designed and constructed. Three prototypes were built with different techniques of producing the gadolinium converter. The performance of the cosmic ray test, the signal and the radiation spectrum were discussed in this paper. Lastly, the efficiency of one prototype with the best performance for detecting the thermal neutron was tested as 8.7%. 相似文献
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为了解决实际印刷车间突发设备故障和紧急插单问题,本文采用滚动窗口技术结合遗传算法的方法,建立适合实际印刷车间生产的动态再调度模型。设定若干印品订单、机器设备的加工工序以及各工序加工时间、工序约束条件等,以订单的最大最小加工时间和再调度的偏离度为多目标优化,采用周期与事件混合驱动策略,将滚动窗口再调度机制和遗传算法相结合进行流程设计和编码,构建印刷车间再调度模型。采用标准问题FT06和FT01验证了本文设计的模型算法的有效性和可行性。运行程序,模拟正常加工时紧急插单和机器故障突发时,系统生产新的调度计划即调度甘特图,仿真结果表明该动态调度模型可以用于印刷作业的正常排产调度,在遇突发状况时可生成稳定、符合交货日期的再调度方案。 相似文献
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谢宇广 李卫东 梁羽铁 尤郑昀 冒亚军 张家文 边渐鸣 曹国富 曹学香 陈申见 邓子艳 傅成栋 高原宁 何康林 何苗 花春飞 黄彬 黄性涛 季晓斌 李飞 李海波 刘春秀 刘怀民 刘秋光 刘锁 刘英杰 马秋梅 马想 毛泽普 莫晓虎 潘明华 庞彩莹 平荣刚 秦亚红 邱进发 孙胜森 孙永昭 王纪科 王亮亮 文硕频 伍灵慧 徐敏 严亮 苑长征 袁野 张炳云 张长春 张建勇 张学尧 张瑶 郑阳恒 朱科军 朱永生 朱志丽 邹佳恒 《中国物理 C》2010,34(3):344-353
The calibration algorithm for RPC-based muon detector at BESIII has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer, module and strip levels have been calibrated with cosmic ray data. The calibration constants are available for simulation and reconstruction tuning. The results of Monte Carlo and data are also compared to check the validation and reliability of the algorithm. 相似文献
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徐吉磊 关梦云 杨长根 王贻芳 张家文 LU Chang-Guo Kirk McDonald Robert Hackenburg Kwong Lau Logan Lebanowski Cullen Newsom Lin Shih-Kai Jonathan Link 马烈华 Viktor Pec Vit Vorobel 陈进 刘金昌 周永钊 梁昊 《中国物理 C》2011,35(9):844-850
Resistive Plate Chamber (RPC) modules will be used as one part of the cosmic muon veto system in the Daya Bay reactor neutrino experiment. A total of 189 RPC modules will cover the three water pools in the experiment. To achieve track reconstruction and high efficiency, each module consists of 4 layers, each of which contains two sizes of bare chambers. The placement of bare chambers is reversed in different layers to reduce the overlapping dead areas. The module efficiency and patch efficiency were studied both in simulation and test of the data analysis. 143 modules have been constructed and tested. The preliminary study shows that the module and patch 3 out of 4 layers efficiency reaches about 98%. 相似文献