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一种磁耦合电动汽车无线充电系统设计与实现

电力电子技术 2024年第1期58卷 53-56页

作者：李江南李锐华马艺林胡波同济大学电子与信息工程学院上海201804

电动汽车无线充电(EV-WPT)技术,作为一种新型的充电方式,已成为EV充电技术领域的重要发展方向。基于SAE J2954国际标准,设计与实现了一种3.3 kW磁耦合谐振式电动汽车无线充电系统。首先通过分析无线充电系统的组成及充电过程工作状态,... 详细信息

电动汽车无线充电(EV-WPT)技术,作为一种新型的充电方式,已成为EV充电技术领域的重要发展方向。基于SAE J2954国际标准,设计与实现了一种3.3 kW磁耦合谐振式电动汽车无线充电系统。首先通过分析无线充电系统的组成及充电过程工作状态,提出了一种磁耦合谐振式EV-WPT系统设计方案,然后针对各组成部分进行了参数设计,最后进行了实验测试。测试结果验证了系统设计方案的可行性及有效性,当传输距离为150 mm时,磁耦合机构传输效率可达89%,EV-WPT系统传输效率可达85%,完全满足SAE J2954标准要求。

关键词：电动汽车无线充电磁耦合谐振传输距离

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橡胶企业生化尾水深度处理剂的研制与评价

化学工程师 2024年第9期38卷 42-46页

作者：付初福李瑞华宾士福中国化学工业桂林工程有限公司广西桂林541004 中国市政工程西北设计研究院有限公司甘肃兰州730000 桂林市城市规划设计研究院广西桂林541004

本文采用2499型PVA、HEDP、聚合氯化铝、KMnO_(4)为原料制备橡胶企业生化尾水深度处理剂;通过单因素实验筛选出最佳氧化剂类型与加量;设计两组正交实验,优化出最佳反应条件并筛选出最佳反应物配比。实验结果表明,以COD为考察因素,制备... 详细信息

本文采用2499型PVA、HEDP、聚合氯化铝、KMnO_(4)为原料制备橡胶企业生化尾水深度处理剂;通过单因素实验筛选出最佳氧化剂类型与加量;设计两组正交实验,优化出最佳反应条件并筛选出最佳反应物配比。实验结果表明,以COD为考察因素,制备处理剂的最佳反应条件为反应温度为60℃、反应时间为5h、体系p H值为7、机械搅拌速度为600r·min^(-1);以COD、SS、BOD以及NH_(3)-N为考察因素,优化出KMnO_(4)为最佳氧化剂,最优加量为9%;反应物的最佳配比为14%PVA+10%聚合氯化铝+10%HEDP+9%KMnO_(4);参照GB 27632-2011《橡胶制品工业污染物排放标准》优化出处理剂最佳加量为150 mg·L^(-1),动态连续处理工艺中最佳的进液流量应为100 L·h^(-1)。

关键词：橡胶企业废水深度处理处理剂

Mechanism of local solidification time variations with melt rate during vacuum arc remelting process of 8Cr4Mo4V high-strength steel

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Journal of Iron and Steel Research International 2024年第2期31卷 377-388页

作者： Tao Pan Hong-chun Zhu Zhou-hua Jiang hua-bing li rui Zhang Hao Feng School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

A 2D axisymmetric numerical model was established to investigate the variations of molten pool with different melt rates during the vacuum arc remelting of 8Cr4Mo4V high-strength steel,and the ingot growth was simulated by dynamic mesh *** results show that as the ingot grows,the molten pool profile changes from shallow and flat to V-shaped,and both the molten pool depth and the mushy width ***,the variation of both the molten pool shape and the mushy width melt rate is clarified by the thermal equilibrium *** melt rate increases,both the molten pool depth and the mushy width *** is caused by the increment in sensible heat stored in the ingot due to the limitation of the cooling capacity of the *** nonlinear increment in sensible heat leads to a nonlinear increase in the mushy *** addition,as melt rate increases,the local solidification time(LST)of ingot decreases obviously at first and then *** melt rate is controlled in a suitable range,LST is the lowest and the secondary dendrite arm spacing of the ingot is the smallest,which can effectively improve the compactness degree of 8Cr4Mo4V high-strength steel.

关键词： 8Cr4Mo4V high-strength steel Vacuum arc remelting process Melt rate Molten pool Local solidification time

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麦冬皂苷D的药理作用研究进展

抗感染药学 2024年第1期21卷 1-6页

作者：孙燕朱立红陈俊怡李锐华赵芳丽周静怡苏州市吴江区中医医院(苏州市吴江区第二人民医院) 江苏苏州215200

麦冬皂苷D是从中药麦冬中提取出的甾体皂苷类成分,具有抗炎、抗肿瘤、降脂、心肌保护作用、神经保护作用、胃肠道保护、调节骨代谢等广泛的药理作用。该文对近些年麦冬皂苷D的药理作用研究进行了综述和分析,为其进一步开发提供参考。

关键词：麦冬皂苷D 药理作用研究进展抗炎作用抗肿瘤作用降脂作用心肌保护作用神经保护作用胃肠道保护调节骨代谢

Local tetragonal distortion of Pt alloy catalysts for enhanced oxygen reduction reaction efficiency

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Carbon Energy 2024年第7期6卷 41-52页

作者： Xiaoke li Xiao Duan Kang hua Yongkang Wu Zhiyan rui rui Ding Aidong li Chen Ouyang Jia li Ting li Jianguo liu National Laboratory of Solid-State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingChina Long-life Fuel Cell Key Laboratory in Sichuan Province Dongfang Electric(Chengdu)Hydrogen Fuel Cell Technology Co.Ltd.ChengduChina Institute of Energy Power Innovation North China Electric Power UniversityBeijingChina

Platinum-based alloy nanoparticles are the most attractive catalysts for the oxygen reduction reaction at present,but an in-depth understanding of the relationship between their short-range structural information and catalytic performance is still ***,we present a synthetic strategy that uses transition-metal oxide-assisted thermal ***/C catalysts with localized tetragonal distortion were obtained by controlling the thermal diffusion process of transition-metal *** localized structural distortion induced a significant strain effect on the nanoparticle surface,which further shortened the length of the Pt-Pt bond,improved the electronic state of the Pt surface,and enhanced the performance of the ***/C catalysts with special short-range structures achieved excellent mass activity(2.27 Amg_(Pt)^(-1))and specific activity(3.34 A cm^(-2)).In addition,the localized tetragonal distortion-induced surface compression of the Pt skin improved the stability of the *** mass activity decreased by only 13%after 30,000 *** catalyst activity and excellent durability have also been demonstrated in the proton exchange membrane fuel cell *** study provides valuable insights into the development of advanced Pt-based nanocatalysts and paves the way for reducing noble-metal loading and increasing the catalytic activity and catalyst stability.

关键词： electrocatalysts fuel cells local tetragonal distortion oxygen reduction

On the Performances of Estimating Stellar Atmospheric Parameters from CSST Broad-band Photometry

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Research in Astronomy and Astrophysics 2024年第4期24卷 161-173页

作者： rui-Feng Shi Yang huang Xin-Yi li hua-Wei Zhang School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China CAS Key Lab of Optical Astronomy Key Laboratory of Space Astronomy and TechnologyNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China College of Physics and Electronic Engineering Qilu Normal UniversityJinan 250200China Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

Deriving atmospheric parameters of a large sample of stars is of vital importance to understand the formation and evolution of the Milky *** surveys,especially those with near-ultraviolet filters,can offer accurate measurements of stellar parameters,with the precision comparable to that from low/medium resolution *** this study,we explore the capability of measuring stellar atmospheric parameters from Chinese Space Station Telescope(CSST)broad-band photometry(particularly in the near-ultraviolet bands),based on synthetic colors derived from model *** find that colors from the optical and near-ultraviolet filter systems adopted by CSST show significant sensitivities to the stellar atmospheric parameters,especially the *** to our mock data tests,the precision of the photometric metallicity is quite high,with typical values of0.17 and 0.20 dex for dwarf and giant stars,*** precision of the effective temperature estimated from broad-band colors are within 50 K.

关键词： methods:data analysis stars:abundances surveys

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船舶尾气脱硝方案的技术经济分析

武汉船舶职业技术学院学报 2024年第4期23卷 79-82,92页

作者：向轶吴迪杨国华李瑞华苟远波陈艳艳中煤能源研究院有限责任公司陕西西安710054 西安航天源动力工程有限公司陕西西安710100

为给船舶尾气氮氧化物的减排提供最优方案,介绍了三种可用于尾气处理的脱硝技术,并基于方案比选和效益测算的方式对可行性较高的船用SCR脱硝和臭氧氧化脱硝进行了技术经济分析。结果显示:SCR脱硝的运行成本体现在尿素消耗、电耗、淡水... 详细信息

为给船舶尾气氮氧化物的减排提供最优方案,介绍了三种可用于尾气处理的脱硝技术,并基于方案比选和效益测算的方式对可行性较高的船用SCR脱硝和臭氧氧化脱硝进行了技术经济分析。结果显示:SCR脱硝的运行成本体现在尿素消耗、电耗、淡水消耗、压缩空气消耗和催化剂更换上,总运行费用为107.3元/h;臭氧氧化脱硝的运行成本体现在电耗上,总运行费用为875.3元/h;SCR脱硝和臭氧氧化脱硝系统的电耗分别占柴油机总功率的0.46%和12.78%,即SCR对船舶供电系统的负担更小,且无废水产生。因此认为SCR脱硝用于船舶尾气治理时技术可行性高,经济性好。

关键词：船舶尾气 NOx 脱硝 SCR 臭氧氧化

面向扎根服务榆林的智能化人才三个联合培养模式研究与实践

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榆林学院学报 2024年第5期34卷 125-128页

作者：冯治东郭红波李海雄吴敏宁李瑞华榆林学院信息工程学院陕西榆林719000

目前榆林信息产业人才保障不足、本地高质量技术服务较差,智能化人才团队建设缓慢等问题突出,针对扎根服务榆林的智能化人才培养需求,提出“教学科研联合、师生联合、校企联合”的三个联合人才培养新模式,即“一中心、一引领、一面向、... 详细信息

目前榆林信息产业人才保障不足、本地高质量技术服务较差,智能化人才团队建设缓慢等问题突出,针对扎根服务榆林的智能化人才培养需求,提出“教学科研联合、师生联合、校企联合”的三个联合人才培养新模式,即“一中心、一引领、一面向、两抓手、三联合”模式:以高质量人才培养为中心,在党建引领下,面向扎根服务榆林,紧抓立德树人,紧抓专业建设,联合师生、联合校企、联合科教,专心培养扎根服务榆林本地的智能化人才。该模式以资源共享、优势互补、联动发展、共同进步的方式协同推进人才培养和科技创新的发展,对于提高教育质量、推动地方经济发展和社会进步具有重要意义。

关键词：产教融合智能化人才联动发展三个联合

Different timing for abdominal paracentesis catheter placement and drainage in severe acute pancreatitis complicated by intraabdominal fluid accumulation

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World Journal of Gastrointestinal Surgery 2024年第1期16卷 134-142页

作者： rui Chen hua-Qiang Chen rui-Die li Hui-Min Lu Department of General Surgery Chengdu Sixth People’s HospitalChengdu 610058Sichuan ProvinceChina West China Center of Exellence for Pancreatitis Institute of Integrated Traditional Chinese and Western MedicineWest ChinaDivision of Pancreatic SurgeryDepartment of General SurgeryWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina HospitalSichuan University

BACKGROUND Non-surgical methods such as percutaneous drainage are crucial for the treatment of patients with severe acute pancreatitis(SAP).However,there is still an ongoing debate regarding the optimal timing for abdominal paracentesis catheter place-ment and *** To explore the influence of different timing for abdominal paracentesis catheter placement and drainage in SAP complicated by intra-abdominal fluid *** Using a retrospective approach,184 cases of SAP complicated by intra-abdominal fluid accumulation were enrolled and categorized into three groups based on the timing of catheter placement:group A(catheter placement within 2 d of symptom onset,n=89),group B(catheter placement between days 3 and 5 after symptom onset,n=55),and group C(catheter placement between days 6 and 7 after symptom onset,n=40).The differences in progression rate,mortality rate,and the number of cases with organ dysfunction were compared among the three *** The progression rate of group A was significantly lower than those in groups B and groups C(2.25%vs 21.82%and 32.50%,Plity rates in group A,group B,and group C were similar(P>0.05).At postoperative day 3,the levels of C-reactive protein(55.41±19.32 mg/L vs 82.25±20.41 mg/L and 88.65±19.14 mg/L,P<0.05),procalcitonin(1.36±0.51 ng/mL vs 3.20±0.97 ng/mL and 3.41±0.98 ng/mL,P<0.05),tumor necrosis factor-alpha(15.12±6.63 pg/L vs 22.26±9.96 pg/L and 23.39±9.12 pg/L,P<0.05),interleukin-6(332.14±90.16 ng/L vs 412.20±88.50 ng/L and 420.08±87.65ng/L,P<0.05),interleukin-8(415.54±68.43 ng/L vs 505.80±66.90 ng/L and 510.43±68.23ng/L,P<0.05)and serum amyloid A(270.06±78.49 mg/L vs 344.41±81.96 mg/L and 350.60±80.42 mg/L,P<0.05)were significantly lower in group A compared to those in groups B and group *** length of hospit

关键词： Abdominal paracentesis catheter drainage Timing Severe acute pancreatitis Intra-abdominal fluid Application value