Commissioning and operation of the cryostat for 3W1 SC wiggler

A 3W1 superconducting wiggler (SCW) with the pole gap of 68 mm was successfully tested and installed in a BEPC II storage ring in November, 2019. The goal of zero liquid helium consumption was achieved, and the cryogenic system exhibited a 12%residual cooling capacity (approximately 0.69 W@4.2 K). The 3W1-SCW was set to operate at 2.49 T and has been operating for more than seven months. Three instances of magnet quenching occurred during the normal operation. The evaporated helium gas can be re...     

Experimental study on the mechanism of flow blockage formation in fast reactor

Various sources of solid particles might exist in the coolant flow of a liquid metal cooled fast reactor (e.g., through chemical interaction between the coolant and impurities, air, or water, through corrosion of structural materials, or from damaged/molten fuel). Such particles may cause flow blockage accidents in a fuel assembly, resulting in a reduction in coolant flow,which potentially causes a local temperature rise in the fuel cladding, cladding failure, and fuel melt. To understand the bl...     

辊弯成形下塑性应变对挤压态6063 T66铝合金型材疲劳性能的影响（英文）

分析从辊弯成形型材区和预应变材料取样的材料的拉伸塑性应变。利用概率Weibull累积分布(P-S-N曲线)近似高周疲劳的实验数据。利用LS-Dyna程序和实验数据对辊弯成形进行数值模拟，建立疲劳寿命预测模型。材料的循环行为表明，随着静态失效水平的增加，疲劳寿命分布减小。断裂表面的断口形貌分析表明，由于晶界附近的位错积累，拉伸预应变的晶间裂纹水平增加。所提模型预测结果与概率散射带具有良好的相关性(误差低于10%)。     

Afterpulse measurement of JUNO 20-inch PMTs

In this study, we present the large photomultiplier tube(PMT) afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO) experiment. A total of 11 dynode-PMTs(R12860) from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK)) and 150 micro-channel plate PMTs(MCP-PMTs, GDB-6201) from the NNVT company(North Night Vision Technology Co., Ltd.(NNVT)) were tested. Subsequently, an afterpulse model was built according to the afterpulse time distribution and the prob...     

High?energy nuclear physics meets machine learning

Although seemingly disparate, high-energy nuclear physics (HENP) and machine learning (ML) have begun to merge in the last few years, yielding interesting results. It is worthy to raise the profile of utilizing this novel mindset from ML in HENP,to help interested readers see the breadth of activities around this intersection. The aim of this mini-review is to inform the community of the current status and present an overview of the application of ML to HENP. From different aspects and using exa...     

Investigation of the level spectra of nuclei in the northeast region of doubly magic 40Ca with intruder orbit g9∕2

This study utilizes large-scale shell model calculations with the extended pairing and multipole–multipole force model(EPQQM) to investigate low-lying states in the nuclei of ⁴²Ca,⁴²Sc,and ^42-44Ti.The model space in this study includes the fp shell as well as the intruder g_9∕2 orbit,which accurately reproduces the positive parity levels observed in the aforementioned nuclei and predicts high energy states with negative parity coupled with the intruder ...     

Data?driven simultaneous vertex and energy reconstruction for large liquid scintillator detectors

High-precision vertex and energy reconstruction are crucial for large liquid scintillator detectors such as that at the Jiangmen Underground Neutrino Observatory (JUNO), especially for the determination of neutrino mass ordering by analyzing the energy spectrum of reactor neutrinos. This paper presents a data-driven method to obtain a more realistic and accurate expected PMT response of positron events in JUNO and develops a simultaneous vertex and energy reconstruction method that combines the ...     

Probing nucleon effective mass splitting with light particle emission

The main objective of this study was to investigate the impact of effective mass splitting on heavy-ion-collision observables.We first analyzed correlations between different nuclear matter parameters obtained from 119 effective Skyrme interaction sets.The values of the correlation coefficients illustrate that the magnitude of effective mass splitting is crucial for tight constraints on the symmetry energy via heavy-ion collisions.The ⁸⁶ Kr+²⁰⁸ Pb system at beam energies ra...     

Rare earth metal as a dopant element:Cerium ion as an articulator in hexavalent chromium removal by magnetic iron oxides

This study highlights introducing the rare earth metal cerium(Ce(Ⅳ)) into the structure of magnetite(Fe₃O₄) to achieve enhanced adsorptive properties for the removal of chromium(Cr(VI)) from an aqueous medium.Different ratios of Ce(Ⅳ) were introduced into the iron oxide matrix,termed FeCe-5,FeCe-10,and FeCe-20.Their numerical values correspond to the nominal content of the dopant element added to the synthesis medium.The solid materials were characterized for morphology and...     

计算机组成原理实验教学方法探讨

本文从当前计算机组成原理实验课程教学中存在的问题入手，讨论了现有课程理论教学与实验教学中的教学实践成果，并分析了“计算机组成原理”实验教学的现状和存在的问题。结合目前的实际教学经验、具体实验内容、实验设备、教学手段等方面，对提高该课程的实验教学质量、探讨教学效果更好的教学方法提出了一些思路与想法。