离子吸附型稀土矿开采机理研究进展

离子吸附型稀土矿的开采主要基于离子交换和稀土溶液运移。为实现离子吸附型稀土矿绿色高效开采，研究者们提出了一系列的开采工艺，并建立了相关的稀土运移和渗流理论。本文综述了目前现有或潜在的离子吸附型稀土矿开采工艺，重点分析了浸出动力学、塔板、对流扩散和外加电场驱动等稀土离子运移理论，探讨了开采过程风化壳中稀土溶液的渗流特性及影响因素，提出钙盐镁盐浸出、生物浸出和电动开采等开采工艺的优化思路，即应采用微观谱学、数值模拟和多学科交叉等手段加强稀土离子运移理论和风化壳中稀土溶液渗流特性的基础研究，实现离子吸附型稀土矿绿色高效开采

离子吸附型稀土矿开采机制研究进展

离子吸附型稀土矿的开采主要基于离子交换和稀土溶液运移。为实现离子吸附型稀土矿绿色高效开采，研究者们提出了一系列的开采工艺，并建立了相关的稀土运移和渗流理论。本文综述了目前现有或潜在的离子吸附型稀土矿开采工艺，重点分析了浸出动力学、塔板、对流扩散和外加电场驱动等稀土离子运移理论，探讨了开采过程风化壳中稀土溶液的渗流特性及影响因素，提出钙盐镁盐浸出、生物浸出和电动开采等开采工艺的优化思路，即应采用微观谱学、数值模拟和多学科交叉等手段加强稀土离子运移理论和风化壳中稀土溶液渗流特性的基础研究，实现离子吸附型稀土矿绿色高效开采

一种大尺寸超导磁铁叠压铁芯的制备方法.

本发明涉及带电粒子传输使用的超导电磁铁的制造方法。一种大尺寸超导磁铁叠压铁芯的制备方法，其主要特点包括冲片、检测、粘结端板、机械加工、半铁芯叠压及焊接、整体铁芯装配，在上下磁铁之间加装导向柱，导向柱分别装配在上下铁芯上，通过调试使相互间配合良好，固定上下导向柱的位置；装配时，在上铁芯下降过程快接近超导线圈杜瓦盒时，导向柱开始工作，以保证不会因为上铁芯不能对正而破坏外杜瓦盒。本发明的优点是可以制造叠片磁铁铁芯为20T以上的超导磁铁，磁铁铁芯叠装后采用焊接结构保持铁芯机械尺寸。在保证磁铁磁场强度和磁场精度的同时，采用了合理实用的制造工艺；在冲制，叠压，烘烤，检测等诸多过程中，完成了物理设计到工程实施的转变

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^