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Research and development of the high precision low field dipole magnet for CEPC Booster

JOURNAL OF INSTRUMENTATION 2024年第2期19卷 P02006页

作者： Kang, Wen Zhou, Jianxin Li, Yuhui Dai, xuwen Guo, Runbing Mu, Zhihui Pan, Juntong Yang, Mei chen, Fusan Chinese Acad Sci Inst High Energy Phys Beijing Peoples R China

In the Conceptual Design Report (CDR) stage of the Circular Electron and Positron Collider (CEPC), the injection energy of the Booster is 10 GeV and minimal working field of the dipole magnets is only 29 G, the magnets with iron cores could not meet the requirement of the field precision due to the remnant field. In the CEPC Technical Design Report (TDR) stage, the injection energy of the Booster is increased to 30 GeV and the minimal working field of the dipole magnets is raised to 95 G so that the influence of the remnant field becomes relatively small, the iron core dipole magnets can be used for the Booster. In this paper, the technical design of the CEPC Booster dipole magnets is described, the development and test of a full scale prototype pure dipole magnet are presented.

关键词： Acceleration cavities and superconducting magnets (high-temperature superconductor, radiation hardened magnets, normal-conducting, permanent magnet devices, wigglers and undulators) Instrumentation for particle accelerators and storage rings - high energy (linear accelerators, synchrotrons)

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Quantitative evaluation of O2 activation half-reaction for Fe-N-C in oxidase-like activity enhancement

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CATALYSIS SCIENCE & TECHNOLOGY 2021年第22期11卷 7255-7259页

作者： chen, Xinghua Zhu, Caixia Xu, Yuan Wang, Kaiyuan Cao, xuwen Shen, Yanfei Liu, Songqin Zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed ResState Key Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

The oxidase-like activity of high-performance Fe-N-C was enhanced by up to 55% by using a secondary N-containing precursor in pyrolysis. Moreover, the exploration of the O-2 activation half-reaction using electrochemical methods was disclosed to be a practically facile approach to quantitatively evaluate the factors associated with the activity.

关键词： Iron compounds

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Identification of Ground Fissure Development in a Semi-Desert Aeolian Sand Area Induced from Coal Mining: Utilizing UAV Images and Deep Learning Techniques

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REMOTE SENSING 2024年第6期16卷 1046页

作者： Tao, Tao Han, Keming Yao, Xin chen, Ximing Wu, Zuoqi Yao, Chuangchuang Tian, xuwen Zhou, Zhenkai Ren, Kaiyu China Univ Geosci Fac Engn Wuhan 430074 Peoples R China Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China Minist Nat Resources Key Lab Act Tecton & Geol Safety Beijing 100081 Peoples R China CCTEG Ecol Environm Technol Co Ltd Beijing 100013 Peoples R China

The occurrence of surface strata movement in underground coal mining leads to the generation of numerous ground fissures, which not only damage the ecological environment but also disrupt building facilities, lead to airflow and easily trigger coal spontaneous combustion, induce geological disasters, posing a serious threat to people's lives, property, and mining production. Therefore, it is particularly important to quickly and accurately obtain the information of ground fissures and then study their distribution patterns and the law of spatial-temporal evolution. The traditional field investigation methods for identifying fissures have low efficiency. The rapid development of UAVs has brought an opportunity to address this issue. However, it also poses new questions, such as how to interpret numerous fissures and the distribution law of fissures with underground mining. Taking a mine in the Shenfu coalfield on the semi-desert aeolian sand surface as the research area, this paper studies the fissure recognition from UAV images by deep learning, fissure development law, as well as the mutual feed of surface condition corresponding to the under-ground mining progress. The results show that the DRs-UNet deep learning method can identify more than 85% of the fissures;however, due to the influence of seasonal vegetation changes and different fissure development stages, the continuity and integrity of fissure recognition methods need to be improved. Four fissure distribution patterns were found. In open-cut areas, arc-shaped fissures are frequently observed, displaying significant dimensions in terms of depth, length, and width. Within subsidence basins, central collapse areas exhibit fissures that form perpendicular to the direction of the working face. Along roadways, parallel or oblique fissures tend to develop at specific angles. In regions characterized by weak roof strata and depressed basins, abnormal reverse-"C"-shaped fissures emerge along the mining direction.

关键词： mining strata movement law mining ground fissure UAVs automatic identification Shenfu coalfield

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基于振动的斜拉索索力异常自动检测与处理

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公路 2024年第10期69卷 102-106页

作者：陈岱杰徐文城王凯舟山市六横大桥二期工程建设指挥部舟山市316131 中交公路规划设计院有限公司北京市100010

斜拉索是斜拉桥的重要传力构件。因此,在斜拉桥的结构健康监测中获取有效的斜拉索索力是非常重要的。在对桥梁结构的长期监测中,由于传感器故障、系统故障、传输数据丢失、供电不稳定等各种原因导致的异常信号的出现几乎是不可避免的,... 详细信息

斜拉索是斜拉桥的重要传力构件。因此,在斜拉桥的结构健康监测中获取有效的斜拉索索力是非常重要的。在对桥梁结构的长期监测中,由于传感器故障、系统故障、传输数据丢失、供电不稳定等各种原因导致的异常信号的出现几乎是不可避免的,并且极有可能导致后续分析质量的下降。依托福建某斜拉桥基于环境振动信号的斜拉索索力监测数据开展分析,结果表明,采用适当的最大响应值阈值,可以用相对简单的算法实现斜拉索振动测量的自动异常检测和处理。

关键词：斜拉桥斜拉索索力振动测试健康监测异常信号自动检测

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基于岗位胜任力的培训模式在突发公共事件卫生应急救援培训中的应用

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中华卫生应急电子杂志 2019年第1期5卷 61-64页

作者：李素婷林雪英陈旭文广州市增城区人民医院护理部广东广州511300

目的分析岗位胜任力培训模式在突发公共事件卫生应急救援培训中的应用价值。方法以2016年3月至2018年3月某医院内部46名医护人员作为研究对象,其中男性18例,女性28例;年龄24～45岁,平均(35.28±2.31)岁。采用随机数字表法,将其分为... 详细信息

目的分析岗位胜任力培训模式在突发公共事件卫生应急救援培训中的应用价值。方法以2016年3月至2018年3月某医院内部46名医护人员作为研究对象,其中男性18例,女性28例;年龄24～45岁,平均(35.28±2.31)岁。采用随机数字表法,将其分为试验组和常规组,每组医护人员23人。试验组采用的培训模式是岗位胜任力培训模式,常规组采用的培训模式是常规性培训模式。比较两组医护人员岗位胜任能力以及患者的反馈分值和患者满意度。结果培训后,试验组医护人员的响应时间、院内分诊时间、输液通道开通时间、抢救措施落实时间、完成分流时间、患者停留时间均优于常规组,差异有统计学意义(P<0.05)。培训后,两组医护人员的理论成绩和操作成绩均高于培训前(P<0.05),但试验组优于常规组,差异有统计学意义(P<0.05)。培训后,试验组患者标准化反馈分值高于培训前,(P<0.05),且优于常规组,差异有统计学意义(P<0.05)。培训后,试验组和常规组对应的患者满意度分别为95.00%、77.50%,常规组低于试验组,差异有统计学意义(P<0.05)。结论在面临突发公共事件卫生时,对医护人员在应急救援培训中采用岗位胜任力的培训模式,具有较好的效果,值得广泛应用于应急救援培训中。

关键词：岗位胜任力突发公共事件应急救援培训

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Mesoporous Palladium-Boron-Sulfur Alloy Nanospheres for Efficient Hydrogen Evolution

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INORGANIC CHEMISTRY 2021年第7期60卷 4380-4384页

作者： Guo, xuwen chen, Zhichao Huang, Yanping Lv, Hao Wang, Yaru Sun, Lizhi Song, Kai Liu, Ben Nanjing Normal Univ Jiangsu Collaborat Innovat Ctr Biomed Funct Mat Sch Chem & Mat Sci Jiangsu Key Lab New Power Batteries Nanjing 210023 Peoples R China Shenzhen RELX Technol Co Ltd Shenzhen 518108 Peoples R China Sichuan Univ Coll Chem Chengdu 610064 Peoples R China Changchun Normal Univ Sch Life Sci Changchun 130032 Peoples R China Sichuan Univ Sch Chem Engn Ctr Engn Expt Teaching Chengdu 610065 Peoples R China

Ternary noble metal-metalloid-nonmetal PdBS alloy mesoporous nanospheres (MSs) with three-dimensional central-radial pore channels were prepared for an electrocatalytic hydrogen evolution reaction. The synthesis was performed via precise control in the reduction and nucleation growth of ternary PdBS alloy MSs along confined cylinder mesophases assembled by amphiphilic dioctadecyldimethylammonium chloride. The resultant PdBS alloy MSs disclosed a remarkably improved electrocatalytic performance due to their structural and compositional synergies. This finding extended our knowledge on the rational design and targeted synthesis of novel noble metal-metalloid-nonmetal alloys with desired structures and morphologies for catalysis and other applications.

关键词： Palladium Alloys Genetics Evolution reactions Transmission electron microscopy

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A Linearly Polarized Holographic Metasurface Antenna Loaded with SIW and Its Gain Enhancement Analysis

A Linearly Polarized Holographic Metasurface Antenna Loaded ...

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World Congress on Computing and Communication Technologies (WCCCT)

作者： Chunyu Liu chen Zhang xuwen Guo Yahui Liu Xiaokai Jiang Xinyi Li Huayong Zou Tianjin University of Technology and Education Tianjin China Hebei North University Hebei China Tianjin 712 Mobile Communications Co. LTD Tianjin China

ISBN: (数字)9798331512620

ISBN: (纸本)9798331512637

In this paper, a design method for a linearly polarized antenna is proposed by combining the principle of optical holography and the structure of a center-fed parallel-plate waveguide. By loading the slit cell at a specific location in the top layer of the parallel plate, the slit cell can generate a beam by coupling a reference wave excited by a feed. And by adjusting the slit orientations, linearly polarized light beams can be generated in different directions. The antenna offers the advantages of a low profile, small size, and eliminates the need for a separate feed network. Also, to enhance the gain of this antenna, we propose a method to load the substrate integrated waveguide (SIW) around the antenna. The gain of the metasurface is further enhanced by reducing the reference wave energy leakage, and finally the correctness of the method is verified by electromagnetic simulation results.

关键词： Electromagnetic waveguides Directive antennas Holography Metasurfaces Antenna feeds Wave energy conversion Loaded antennas Optical waveguides Substrates Antenna radiation patterns

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Immunogenicity and safety of an inactivated SARS-CoV-2 vaccine in people living with HIV: A cross-sectional study

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JOURNAL OF MEDICAL VIROLOGY 2022年第9期94卷 4224-4233页

作者： Cai, Shaohang Liao, Guichan Yu, Tao Gao, Qiqing Zou, Lirong Zhang, Huan Xu, xuwen chen, Juanjuan Lu, Aili Wu, Yingsong Li, Baisheng Peng, Jie Southern Med Univ Nanfang Hosp Dept Infect Dis Guangzhou 510515 Peoples R China Southern Med Univ Shunde Hosp Dept Infect Dis Shunde Peoples R China Inst Microbiol Ctr Dis Control & Prevent Guangdong Prov 160 Qunxian RdDashi St Guangzhou 511430 Peoples R China Southern Med Univ Inst Antibody Engn Sch Lab Med & Biotechnol Guangzhou 510515 Peoples R China

We aimed to analyze the efficacy and safety of an inactivated SARS-CoV-2 vaccine in people living with HIV (PLWH). A total of 143 PLWH and 50 healthy individuals were included in this study. A commercially available magnetic chemiluminescence enzyme immunoassay kit was used to detect serum IgG and IgM antibodies against SARS-CoV-2. Serum levels of SARS-CoV-2-specific IgG were significantly higher in the control group than in the PLWH group (p = 0.001). Overall, 76% of individuals in the control group were detected with seropositivity IgG against SARS-CoV-2 compared to 58% in the PLWH group (p = 0.024). In PLWH with IgG seropositivity, CD4+ T-cell counts before antiretroviral therapy (ART) was higher (p = 0.015). Multivariable analysis indicated that CD4+ T cells at IgG detection (odds ratio [OR] = 1.004, p = 0.006) and time after vaccination (OR = 0.977, p = 0.014) were independently associated with seropositivity IgG against SARS-CoV-2 in PLWH. Neutralizing antibody (nAb) titers in PLWH against wild-type SARS-CoV-2 were similar to those in the control group (p = 0.160). The proportion of seropositive nAbs against wild-type SARS-CoV-2 was also similar (95% in the control group vs. 97% in the PLWH group, p = 0.665). Similar results were obtained when nAb was detected against the delta variants with similar titers (p = 0.355) and a similar proportion of seropositive nAbs were observed (p = 0.588). All the side effects observed in our study were mild and self-limiting. The inactivated COVID-19 vaccine appears to be safe with good immunogenicity in Chinese PLWH.

关键词： COVID-19 human immunodeficiency virus neutralizing antibody SARS-CoV-2 vaccination side effects

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Protective effects of paeonol against lipopolysaccharide-induced liver oxidative stress and inflammation in gibel carp (Carassius auratus gibelio)

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COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY 2022年第0期257卷 109339页

作者： Gu, Yipeng chen, Kai Xi, Bingwen Xie, Jun Bing, xuwen Nanjing Agr Univ Wuxi Fisheries Coll Shanshui East Rd 9 Wuxi 214081 Jiangsu Peoples R China Chinese Acad Fishery Sci Freshwater Fisheries Res Ctr Key Lab Freshwater Fisheries & Germplasm Resource Minist Agr & Rural Affairs Wuxi 214081 Jiangsu Peoples R China

Paeonol (2'-hydroxy-4'-methoxyacetophenone) is a phenol that exhibits antioxidant and anti-inflammatory capabilities. In this study, the underlying mechanism of paeonol against LPS-induced oxidative stress and inflammatory responses in gibel carp was investigated. Three hundred healthy gibel carp were divided into five groups (n = 9), intraperitoneally injected with LPS and thereafter treated with paeonol (16 mg/kg and 64 mg/kg). Fish were anesthetized with MS-222 (100 mg/L), and samples were collected at 72 h to investigate plasma biochemical indexes, liver histopathology, antioxidant enzymatic activity, and TLR receptor-related gene expression. Fish injected with LPS (20 mg/kg) exhibited significantly increased plasma aminotransferase (ALT), aminotransferase (AST), lactate dehydrogenase (LDH), glucose (GLU), diamine oxidase (DAO), and alkaline phosphatase (ALP) levels (P < 0.05). In addition, LPS challenge significantly enhanced myeloperoxidase (MPO) and malondialdehyde (MDA) contents, whereas those of catalase (CAT) and glutathione peroxidase (GSH-Px) decreased (P < 0.05). However, treatment with paeonol attenuated these LPS-induced changes (P < 0.05). The mRNA expression of TLR4, TIRAP, MyD88, TRAF6, NF-kappa B, TNF-alpha, IL-1 beta, and IL-8, which were activated by LPS challenge (P < 0.05), were downregulated by paeonol. Additionally, histopathological examination demonstrated that paeonol alleviates LPS-induced hepatic tissue lesions in fish. Taken together, the results suggest that paeonol mitigates LPS-induced liver oxidative stress and inflammation in gibel carp.

关键词： Paeonol Carassius auratus gibelio Lipopolysaccharide Oxidative stress Inflammation

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Review of Remaining Useful Life for Lithium-Ion Batteries

Review of Remaining Useful Life for Lithium-Ion Batteries

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Power and Electrical Technology Conference (APET), Asia

作者： Zhi Hao Yadong He Jun chen Shaowen Luo xuwen Zhou Wenbo Duo Dingxi Power Supply Company State Grid Gansu Electric Power Company Dingxi China School of New Energy and Power Engineering Lanzhou Jiaotong University Lanzhou China

In recent years, with the swift progression of electric vehicles, new energy storage, intelligent robots and other fields, lithium-ion batteries have been widely used to meet the needs of high energy density, high output voltage and wide operating range of the battery. Typically, lithium-ion batteries operate under complex conditions and are accompanied by physical and chemical changes within them. These factors lead to irreversible physical and chemical changes in lithium-ion batteries, and their potential pitfalls can lead to abnormal system operation and even catastrophic events in electrical systems. Therefore, accurate RUL prediction can effectively indicate the health condition of Li-ion battery, and at the same time can ensure the reliability and safety of the system, which is important for the safe operation of the whole Li-ion battery system, and its remaining life assessment has become a research hotspot in the related fields of electrochemistry, intelligent detection and reliability, and has a good development prospect. Therefore, this paper analyzes the common methods and application status of remaining life prediction of lithium-ion batteries, brings together the prediction methods based on model-based methods, data-driven methods and fusion-based methods, and analyzes the advantages and disadvantages of each method to provide reference for relevant technical personnel.

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