纳米硅薄膜中的量子点特征

从电性和结构上论证了纳米硅薄膜中的细微晶粒(3～6nm)具有量子点(Q.D)特征.在其 电导曲线中呈现出随晶粒尺寸减小而增大的小尺寸效应.使用薄层(～20nm厚)纳米硅膜制成了隧道二极管,已在液氮温区(≈77K)在其I-V及σ-V曲线上呈现出Coulomb台阶.对实验结果做了初步分析讨论

Public Emergency and Social Psychological Service System Construction ( Forum)

十九大报告中提出要&quot;加强社会心理服务体系建设&quot;。社会心理服务体系不仅是心理健康服务体系,更是一种社会治理体系。心理学研究成果既可以直接为民众提供心理服务,提高民众幸福感和积极心态,也可以为风险应对、公共突发事件防控提供有力的支持,辅助民众和政府部门做出更为理性的决策。新冠肺炎疫情给社会治理带来了新的挑战,也凸显了民众对心理学知识的需求与认同。随着社会心理服务体系的全面建设、新格局的显现,心理学各种功能将会充分展现于社会发展进程中。社会心理服务体系在后疫情时代将会整合资源发挥其完整功效,深度服务于国家治理体系和国家治理能力的现代化进程,为中国社会的进一步发展贡献更多的专业智慧。</p

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^