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排序方式: 共有14条查询结果,搜索用时 31 毫秒
1.
推拉型有机材料的多重存储特性研究   总被引:1,自引:1,他引:0  
将新合成的推拉型偶氮化合物掺入PMMA中制成薄膜器件,研究了该器件的多重存储特性,实现了三重存储摄影记录及三重存储光电时间状态观测,研究了多重存储的竞争现象,给出多重存储有关现象的机理解释。  相似文献
2.
描述了北京谱仪桶部簇射计数器(BanelShowerCounter)的改进升级工作,改进后的桶部簇射计数器在能量分辨和位置分辨方面有了明显的提高,经对Bhabha事例进行离线刻度后,能量分辨好于21%,z向位置分辨小于3cm.  相似文献
3.
描述了北京谱仪桶部簇射计数器(BanelShowerCounter)的改进升级工作,改进后的桶部簇射计数器在能量分辨和位置分辨方面有了明显的提高,经对Bhabha事例进行离线刻度后,能量分辨好于21%,E,z向位置分辨小于3cm.  相似文献
4.
张羽  刘志海  杨军  苑立波  孙晶华 《发光学报》2011,(12):1286-1291
通过将标准单芯单模光纤与纤芯圆对称分布的多芯光纤的一个纤芯对准熔接后,再在多芯光纤任意位置进行热熔融拉锥,实现多芯光纤光功率的高效耦合注入和光功率在各个纤芯中分布比例的控制,解决了由于多芯光纤结构的特殊性引起的光源光功率难于直接注入的问题。基于光纤耦合模理论建立多芯光纤各纤芯之间的耦合模方程,得到各个纤芯中光功率与耦合长度之间的关系曲线,并与实际耦合实验结果对比,验证该方法可行。研究结果可为多芯光纤光学器件的发展提供潜在的应用价值。  相似文献
5.
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
6.
The principle of the method for the BESIII TOF calibration using cosmic ray data without magnetic field are reported in this paper. After applying calibration constants, the single-end readout time resolution could reach about 150 ps, and the time resolution for one layer is achieved to be about 110 ps. The paper also described the extraction scheme for the event start time of cosmic events.  相似文献
7.
Software alignment is quite important for a tracking detector to reach its ultimate position accuracy and momentum resolution. We developed a new alignment algorithm for the BESⅢ Main Drift Chamber using the Kalman Filter method. Two different types of data which are helix tracks and straight tracks are used to test this algorithm, and the results show that the design and implementation is successful.  相似文献
8.
This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as Ks^0, A, as well as on lifetime measurements using a 3-dimensional fit. The kinematic constraints between the production and decay vertices and the decay vertex fitting algorithm based on the least squares method are both presented. Reconstruction efficiencies including experimental resolutions are discussed. The results and systematic errors are calculated based on a Monte Carlo simulation.  相似文献
9.
The reconstruction algorithm for BESⅢ Muon Counter, MucRecAlg, is developed with the objectoriented language C++ in BESⅢ offine software environment. MucRecAlg consists of the following functions:to find track seeds either from extrapolation of tracks in the main drift chamber or from the fired strips in muon counter, to select fired strips associated to the candidate tracks, to fit the candidate tracks with a linear or quadratic function and to calculate other parameters of the tracks for muon identification. Monte Carlo samples are generated to check the performance of the reconstruction package, such as reconstruction effciency, muon remaining rate and pion rejection rate, etc. The preliminary results show that the pion rejection rate is around 3%—4% while the muon remaining rate is better than 90% in 0.4—1.6 GeV/c momentum region, which meets the requirement as shown in the design report.  相似文献
10.
Cosmic-ray data of 90 M events have been collected and used for calibration,alignment as well as detector tuning. A special tracking algorithm for the BESⅢ muon counter is developed and verified with Monte-Carlo simulation and then further confirmed with the cosmic-ray data. The obtained strip resolutions are in good agreement with the design values. A new alignment approach for the BESⅢ muon counter is confirmed with the cosmic-ray data and proposed to be used in future analysis of experimental data.  相似文献
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