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Research and development of a 0.5-m-long helical superconducting undulator prototype

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Nuclear Science and Techniques 2024年第10期35卷 86-95页

作者： xiang-chen yang Xiao-Wu Yu Jun-Hao Wei xiang-Zhen Zhang Zi-Lin chen Xiao-Juan Bian He-Ting Li Guang-Yao Feng Yu-Hui Li National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Plasma Physics Chinese Academy of Sciences(ASIPP)Hefei 230031China China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan 523000China

The helical undulator is in high demand in synchrotron radiation facilities for circular polarization *** to the higher field strength provided by the superconducting undulator compared to the conventional permanent-magnet undulator,greater research efforts should be directed toward this *** helical superconducting undulator holds great potential in synchrotron radiation facilities,especially in low-energy storage rings that seek circularly polarized radiation with the highest possible radiation *** the successful development of planar superconducting undulators,the Institute of High Energy Physics conducted research and development for the helical superconducting undulator.A 0.5-m-long Deltatype superconducting undulator prototype was developed and *** information on the design,fabrication,and cryogenic testing of the prototype is presented and discussed.

关键词： Helical Superconducting undulator Delta

Elevated-temperature tribological behavior of Ti–B–C–N coatings deposited by reactive magnetron sputtering

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Rare Metals 2015年第12期34卷 838-843页

作者： xiang-yang chen Shao-Fu Huang Sheng-Li Ma Run Huang Jin Zhang Hai-Xia Hu School of Mechanical Engineering Anhui University of Science and Technology State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University School of Materials Science and Engineering Anhui University of Science and Technology

Quaternary Ti–B–C–N coatings with various carbon contents were deposited on high-speed steel (HSS) substrates by reactive magnetron sputtering (RMS) system. The elevated-temperature tribological behavior of Ti–B–C–N coatings was explored using pin-on-disk tribometer, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The present results show that the steady-state friction coefficient value and the instantaneous friction coefficient fluctuation range of Ti–B–C–N coatings decrease as carbon content increases at 100 and 300°C, while the steady-state friction coefficient value of all Ti–B–C–N coatings becomes higher than 0.4 at 500°C. As ambient temperature increases, the running-in periods of all Ti–B–C–N coatings become shorter. Wear damage to Ti–B–C–N coatings during sliding at elevated temperature is mainly caused by adhesive wear, and adhesive-wear damage to Ti–B–C–N coatings increases as ambient temperature increases; however, higher carbon content is beneficial for decreasing the adhesive-wear damage to Ti–B–C–N coatings during sliding at elevated temperature.

关键词： Tribological behavior Ti–B–C–N coatings Reactive magnetron sputtering Elevated temperature

The superconducting magnet for ADS injection-I

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Radiation Detection Technology and Methods 2019年第1期3卷 8-12页

作者： xiang-chen yang Quan-ling Peng Da cheng Feng-yu Xu Yuan chen An-bin chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Harbin Institute of Technology Harbin 150006HeilongjiangChina

Purpose As the world energetic demand is increasing day by day,the development of nuclear energy is of great ***,the development is followed by a lot of tough questions like the management and storage of the nuclear ***,which is short for the accelerator-driven sub-critical system,may be a good choice because it can provide an efficient transmutations of nuclear *** countries have carried out some research in related areas like the USA,Japan and *** superconducting magnet system The cryomodule I(CM1)for China’s ADS Injection-I had been designed,fabricated and online *** CM1 is mainly composed of superconducting spoke cavities,beam positionmonitors,cryogenic system and superconducting *** superconducting magnet system,which includes the magnet and current leads,is aimed at focusing and correcting the proton *** Seven superconducting magnets and current leads for CM1 are successfully designed and *** strength meets design specifications,the field meets the design demands,and the online test shows that the magnets can work in a rather stable *** this paper,the detailed design and installation of the superconducting magnets are presented.

关键词： CM1 Superconducting magnet Current leads

Superconducting multipole wiggler with large magnetic gap for HEPS-TF

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Nuclear Science and Techniques 2022年第2期33卷 21-29页

作者： Xian-Jing Sun Fu-San chen xiang-chen yang Wan chen Xiao-Juan Bian Min-Xian Li Rui Ge Miao-Fu Xu Yao Gao Jin-Can Wang Hui-Hua Lu Jian-She Cao Zhi-Qiang Li Zhuo Zhang Rui Ye xiang-Zhen Zhang Shuai Li Bao-Gui Yin Mei yang Ling-Ling Gong Da-Heng Ji Lin Bian Ran Liang Ya-Jun Sun Hong Shi Institute of High Energy Physics Chinese Academy of SciencesBeijing 10049China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan 523803China

A 16-pole superconducting multipole wiggler with a large gap of 68 mm was designed and fabricated to serve as a multipole wiggler for *** wiggler consists of 16 pairs of NbTi superconducting coils with a period length of 170 mm,and its maximum peak field is 2.6 *** magnet design,magnet poles were ***,the Lorentz force on the coils and electromagnetic force between the upper and lower halves were computed and analyzed along with the stored energy and inductance at different *** enhance the critical current of the magnet coil,all the pole coils selected for the magnet exhibited excellent performance,and appropriate prestress derived from the coil force analysis was applied to the pole coils during magnet *** entire magnet structure was immersed in 4.2-K liquid helium in the cryostat cooled solely by four two-stage cryocoolers,and the performance test of the superconducting wiggler was appropriately *** on the measured results,the first and second field integrals on the axis of the superconducting wiggler were significantly improved at different field levels after the compensation of the corrector ***,the wiggler was successfully installed in the storage ring of BEPCII operation with beams.

关键词： Superconducting multipole wiggler Force analysis Quench protection Magnetic field measurement HEPS-TF Cryostat

Effects of interleukin-18 on airway inflammation and the Th1/Th2 cytokine imbalance in guinea pig asthmatic model

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Journal of Microbiology and Immunology 2005年第3期3卷 193-198页

作者： xiang QI chen TING yang LIN Department of Respiratory Diseases the Union Hospital of Fujian Medical University Fuzhou P. R.China

In order to investigate the effects of interleukin-18 （IL-18） on airway inflammation and the Th1/Th2 cytokine balance in guinea pig asthmatic model as well as its possible mechanisms, the asthmatic model was established by intraperitoneal injection of ovalbumin （OVA） and aerosol challenges into guinea pigs, and 30 treated animals were randomly divided into three groups of 10 animals in each groups, in which group A served as the asthmatic model, group B as the controls and group C as the group treated with IL-18. The counting and categorization of the inflammatory cells in bronchoalveolar lavage fluid （BALF） were performed by using light microscopy, and the contents of cytokines （ IFN-γ, IL- 2, IL-4 and IL-5） were assayed by means of the ELISA kit. The experimental results showed that the numbers of eosinophils （ESO） in BALF of group A, B and C were （97.70 ± 58.03） × 10^6/L, （11.68 × 9.95） × 10^6/L and （28.62 ± 10.46） × 10^6/L, respectively, in which the number of eosinophils in group A was significantly higher than those of group B and C. Also, the number of neutrophils in BALF of group A was even higher than those in group B and C. In addition, the contents of IFN-7 and IL-2 in group A were lower than those in group B and C, but the contents of IL-4 as well as IL-5 were rather higher than those in group B and C. It is evident from the above observations that IL-18 can effectively inhibit the asthmatic inflammatory cells in BALF with an imbalance of the Thl/Th2 cytokines, thus offer- ing the experimental basis for the clinical application of IL-18 in the prevention and treatment of asthma.

关键词： Interleukin-18 Asthmatic model Airway inflammation T helper cells

Formation and evolution of supercritical geofluid

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Science China Earth Sciences 2025年第1期68卷 39-51页

作者： Huaiwei NI Yilin XIAO Xiaolin XIONG Xiandong LIU Chunxiao GAO Yi-xiang chen Yunguo LI Wan-Cai LI Xuan GUO yang-yang WANG Dong-Bo TAN Li ZHANG State Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Sciences and Engineering Nanjing University State Key Lab of Superhard Materials Jilin University

In this work, we provide a comprehensive review on the formation, evolution, properties, and effects of supercritical geofluid. In Earth's interior, enhanced miscibility between H2O and silicate by the addition of special components or by the increase of pressure and temperature gives rise to supercritical geofluid with a significant amount of both H2O and silicate *** formation of supercritical geofluid in magmatic-hydrothermal systems, typified by pegmatite system, is governed by meltfluid critical curve. The formation of supercritical geofluid in metamorphic systems, typified by subducted slab, is governed by the second critical end point. Experimental results suggest that the presence of boron and fluorine in pegmatite system makes it possible to form supercritical geofluid at crustal depths, but the release of supercritical geofluid from subducted slab is withheld until almost 100 km depth. A major presence of both H2O and depolymerized structural units（monomers, dimers, etc.） endows supercritical geofluid with unique physical properties including low density, low elastic moduli, low viscosity, high diffusivity,and high electrical conductivity. Supercritical geofluid can effectively mobilize a variety of elements even including high field strength elements and heavy rare earth elements. The chemical signatures of supercritical geofluid can be inherited by metasomatized mantle and mantle-derived melts, and this could give an explanation of the oxidation of arc magmas. Phase separation of supercritical geofluid through the mechanism of spinodal decomposition leads to formation of a melt network. Multiphase fluid inclusions recovered from subduction zone rocks and pegmatites are possible relics of supercritical geofluid. Supercritical geofluid can cause electrical anomaly and low seismic velocity near the top of subducted slab, and can be linked with intermediate-focus earthquakes. Supercritical geofluid may have played a crucial role in the formation of pe

关键词： Supercritical geofluid Miscibility Subduction zone Pegmatite

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组织史研究三题

华南师范大学学报（社会科学版） 2008年第4期 99-105页

作者：陈向阳华南师范大学历史文化学院广东广州510631

组织史是研究组织产生和发展演变过程及其规律的一门新兴边缘学科,主要研究各种不同层次组织实体的历史变迁以及历史组织与其他历史现象和现实组织的关系等问题。组织史研究方法主要包括组织史料与组织理论结合的方法、组织史叙述与分... 详细信息

组织史是研究组织产生和发展演变过程及其规律的一门新兴边缘学科,主要研究各种不同层次组织实体的历史变迁以及历史组织与其他历史现象和现实组织的关系等问题。组织史研究方法主要包括组织史料与组织理论结合的方法、组织史叙述与分析结合的方法、历史组织过程研究与结构研究结合的方法、组织个体史研究与组织分体史研究和组织整体史研究结合的方法、组织史研究与宏观社会历史研究结合的方法以及历史组织比较研究方法等。

关键词：组织史概念组织史研究内容组织史研究方法

Preparation of Low Ratio Magnesium Ccement by Acid Leaching Treatment of Boron Mud

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 120-129页

作者： yang Mei ZHANG Mingzhe chen Hao School of Materials Science and Engineering Shenyang Jianzhu UniversityShenyang 110168China School of Physical Science and Technology Shenyang Normal UniversityShenyang 110168China

The effects of liquid-solid ratio and reaction time on the leaching rate of magnesium at room temperature were investigated,as well as the effects of the molar ratio of MgO/MgCl_(2),the amount of water added,and the amount of acid-impregnated slag dosed on the compressive strength and water resistance of *** results showed that the magnesium element in the boron mud could be maximally leached under the conditions of 1:1 concentration of hydrochloric acid at room temperature,liquid-solid ratio of 2.5 mL·g^(-1),and reaction time of 5 h,and the main products were amorphous SiO_(2) as well as a small amount of magnesium olivine which had not been completely *** LR-MOC prepared using the acid-soaked mixture could reach a softening coefficient of 0.85 for 28 d of water immersion when the molar ratio of MgO/MgCl_(2) was 2.2,the amount of water added was 0 g,and the acid-soaked slag dosing was 40 wt%,which also led to an appreciable late-strength,with an increase of 19.4%in compressive strength at 28 d compared to that at 7 *** previous studies,LR-MOC prepared in this way has a final strength phase that is not the more easily hydrolysed 3-phase but the lath-like *** this phenomenon,we analyzed the mechanism and found that,during the acid leaching process,a part of amorphous SiO_(2) dissolved in the acid leaching solution formed a silica sol,in which Mg^(2+)played a bridging role to make the silica sol more *** the addition and hydrolysis of MgO,the silica sol gel coagulation slows down,providing a capping layer to inhibit the hydrolysis of the 5-phase crystals and providing some strength after *** amorphous SiO_(2) in the other part of the acid-impregnated slag generated M-S-H gel with Mg^(2+)and OH-,which synergised with the dense structure composed of interlocking crystals to improve the water resistance of LR-MOC.

关键词： boron mud magnesium chloride-oxygen cement acid immersion water resistance silica sol

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SDP实施初期学校反应的心理分析

中国教育学刊 2007年第5期 31-34,43页

作者：陈向阳广西教育学院广西南宁530023

当前在广西西部农村地区实施的学校发展规划(SDP)项目所引发的学校管理的改革不同于以往的渐进式变革,它给学校带来的是一场深刻的适应性挑战,直接对学校、校长以及教师的生存状态构成冲击,如果协调不好容易导致改革的成效低下乃至于失... 详细信息

当前在广西西部农村地区实施的学校发展规划(SDP)项目所引发的学校管理的改革不同于以往的渐进式变革,它给学校带来的是一场深刻的适应性挑战,直接对学校、校长以及教师的生存状态构成冲击,如果协调不好容易导致改革的成效低下乃至于失败。在此不确定的变革情景下,关注教师的情感体验、心态变化、校长角色调适、过程的隐性效应等学校反应就显得十分重要。

关键词：学校发展计划学校反应心理分析