放射性衰变曲线分解的非迭代方法(Ⅰ)——已知一组份衰变常数的三组份衰变曲线的分解

本文提出了一个不用迭代程序分解已知一组份衰变常数的三组份衰变曲线的方法.使用人为合成的衰变数据进行了检验,获得了好的结果.并讨论了该方法的长处以及使用的局限性

核物理实验中的多参数数据获取系统

本文介绍了基于ＭｉｃｒｏＶＡＸⅡ计算机的ＣＡＭＡＣ多参数数据获取系统，最多能进行２５６个参数的数据获取，可实现硬件排零，具有较高的计数率。硬件主要有三个部分组成：逻辑控制电路、ＣＡＭＡＣ读出系统、计算机系统。系统实时获取时，可在线处理和分析数据并在图形终端Ｔｅｋｔｒｏｎ－ｉｘ４０１４上显示谱

对称裂变中惯性张量的计算

为了研究核裂变动力学,在假设核是无旋、不可压缩的液滴情况下,采用两参数的广义卡西尼卵形线液滴模型计算了对称裂变中惯性张量.In order to study the dynamics of symmetric fission,the inertia tensor is com- puted based on twopara meter generaelzed Cassinion oval curve dropter model and the assumiption that nucleus is an irrotational and incompressible fluid

2000–2010年中国典型陆地生态系统实际蒸散量和水分利用效率数据集

蒸散是陆地生态系统水分循环和能量平衡的关键过程,水分利用效率是反映生态系统碳水循环间耦合关系的重要指标,二者在生态学、农学、水文学、气候学等多个学科中均具有重要的应用价值。涡度相关法被认为是现今唯一能直接测量生物圈与大气间物质与能量交换通量的标准方法,已成为生态系统尺度碳水交换通量观测的主要方法。本文通过整合中国陆地生态系统通量观测联盟(China FLUX)的长期观测数据和中国区域其他观测站点基于涡度相关法发表的文献数据,构建了一套中国典型陆地生态系统实际蒸散量和水分利用效率数据集。本数据集共有实际蒸散量数据记录143条、水分利用效率数据记录96条,涉及5种生态系统类型45个生态系统,时间跨度为2000–2010年。本数据集可以为陆地生态系统碳水循环、生态系统管理和评估、全球变化等相关领域的研究提供数据支持

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^