三种鳗鲡肌肉无机元素组成分析

采用电感耦合等离子体发射光谱仪对花鳗鲡、欧洲鳗鲡和日本鳗鲡肌肉无机元素组成进行测定。结果证明 :花鳗鲡肌肉中 Ca含量最高 ,P含量次之 ;而欧洲鳗鲡和日本鳗鲡肌肉中 P含量最高 ,Ca含量次之 ;三种鳗鲡肌肉中 Na、Mg、K含量相近。花鳗鲡肌肉中常量元素和某些微量元素 ( Zn、Fe、Mn)的含量高于欧洲鳗鲡和日本鳗鲡。可认为花鳗鲡在无机元素营养方面优于另二种鳗鲡。在花鳗鲡人工配合饲料中 ,无机元素用量应高于另二种鳗鲡 ,尤其是 Ca、P、Zn和 Fe

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^

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