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In reactor neutrino experiments, the analysis of time correlations between different physical events is an important task. Such analysis can help to understand the physical mechanisms of the signal and background events as well as the details of event selection and background estimation. This study investigates a "sampling and mixing" method used for producing large MC data samples for the Daya Bay reactor neutrino experiment. We designed a simple, generic mixing algorithm and generated large MC data samples for physics analysis from several samples according to their respective event rates. Basic plots based on the mixed data are shown.  相似文献   
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几种齐墩果酸糖缀合物的合成   总被引:8,自引:2,他引:6  
曲峰  李英霞  张一纯  臧静 《有机化学》2003,23(3):249-257
报道了齐墩果酸与四种单糖和二糖(葡萄糖、半乳糖、乳糖及葡萄糖醛酸)进 行糖苷化制备糖缀合物的方法。在合成过程中首先将葡萄糖、半乳糖及乳糖转化成 相应的全苯甲酰三氯亚胺酯糖基供体(10a-10c),将葡萄糖醛酸转化成为1-溴代 乙酰葡萄糖醛酸甲酯糖基供体(10d);在齐墩果酸的28-位羧基上进行酰胺化引入 ω-氨基羧酸甲酯得到其衍生物6。然后10a-10c在TMSOTf的催化下与化合物6的3-位 羟基进行β-糖苷化;10d在AgOTf的催化下与6进行β-糖苷化,最后脱掉保护基得 到相应的糖缀合物13a-13d,所有目的化合物均为新化合物,其结构经IR,^1H NMR,^13C NMR,2D-COSY,HMQC,DEPT及HRMS进行了确证。  相似文献   
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In reactor neutrino experiments, the analysis of time correlations between different physical events is an important task. Such analysis can help to understand the physical mechanisms of the signal and background events as well as the details of event selection and background estimation. This study investigates a "sampling and mixing" method used for producing large MC data samples for the Daya Bay reactor neutrino experiment. We designed a simple, generic mixing algorithm and generated large MC data samples for physics analysis from several samples according to their respective event rates. Basic plots based on the mixed data are shown.  相似文献   
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张一纯  陈平涛  管华诗  李英霞 《中国化学》2005,23(11):1523-1529
将NSAID吲哚美辛与七种天然酚类抗氧化剂偶连,合成了一系列具有抗氧化活性的吲哚美辛衍生物,试图发挥抗炎和抗氧化的双重功效,以降低吲哚美辛的胃肠毒性,同时提高其抗炎活性。对14个目标产物的抗氧化活性和抗炎活性进行了研究,发现上述化合物均表现出明显的抗氧化能力,但没有表现出明显的抑制巴豆油导致的小鼠耳肿胀作用。  相似文献   
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