第十八届美国理论与应用力学大会总结

1会议概况2018年6月5—9日,第18届美国理论与应用力学大会(18th U.S. National Congress of Theoretical and Applied Mechanics, USNCTAM2018)在美国芝加哥召开.本次大会由美国力学国家委员会和中国力学学会联合主办,旨在探讨和交流近四年世界范围内在理论和应用力学领域的基础研究、创新技术的最新进展,吸引了来自世界各地的近千名专家学

中国力学大会-2011暨钱学森诞辰100周年纪念大会简介

1会议概况 值此钱学森诞辰100周年和明年即将在北京举办第23届“世界力学家大会”（ICTAM一2012）之际，由中国科学技术协会和国家自然科学基金委员会指导，中国力学学会和哈尔滨工业大学主办，哈尔滨工业大学和中国力学学会办公室承办，中国科学院力学研究所、清华大学

REVIEW OF THE CHINESE CONFERENCE ON THEORETICAL AND APPLIED MECHANICS 2001 IN MEMORIAL OF TSIEN HSUE-SHEN'S 100 TH ANNIVERSARY

本次力学大会比较全面地反映了我国力学学科的发展现状和最新成就,也体现了我国力学工作者开拓精神和创新意识明显提高,大会取得了圆满成功,此次盛会的顺利召开,必将对明年召开的ICTAM-2012起到了很好的宣传和推动作用

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^