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Two methods for separating the magnetospheric solar wind charge exchange soft X-ray emission from the diffuse X-ray background

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Earth and Planetary Physics 2024年第1期8卷 119-132页

作者： YingJie Zhang TianRan Sun JenniferACarter wenhao liu Steve Sembay ShuiNai Zhang Li Ji Chi Wang State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China College of Earth and Planetary Sciences The University of Chinese Academy of SciencesBeijing 100190China School of Physics and Astronomy The University of LeicesterLeicesterUK Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China

Solar wind charge exchange(SWCX)is the process of solar wind high-valence ions exchanging charges with neutral components and generating soft ***,detecting the SWCX emission from the magnetosphere is proposed as a new technique to study the magnetosphere using panoramic soft X-ray *** better prepare for the data analysis of upcoming magnetospheric soft X-ray imaging missions,this paper compares the magnetospheric SWCX emission obtained by two methods in an XMM-Newton observation,during which the solar wind changed *** two methods differ in the data used to fit the diffuse X-ray background(DXB)parameters in spectral *** method adding data from the ROSAT All-Sky Survey(RASS)is called the RASS *** method using the quiet observation data is called the Quiet method,where quiet observations usually refer to observations made by the same satellite with the same target but under weaker solar wind *** show that the spectral compositions of magnetospheric SWCX emission obtained by the two methods are very similar,and the changes in intensity over time are highly consistent,although the intensity obtained by the RASS method is about 2.68±0.56 keV cm^(-2)s^(-1)sr^(-1)higher than that obtained by the Quiet *** the DXB intensity obtained by the RASS method is about 2.84±0.74 keV cm^(-2)s^(-1)sr^(-1)lower than that obtained by the Quiet method,and the linear correlation coefficient between the difference of SWCX and DXB obtained by the two methods in diffe rent energy band is close to-1,the diffe rences in magnetospheric SWCX can be fully attributed to the diffe rences in the fitted *** difference between the two methods is most significant when the energy is less than 0.7 keV,which is also the main energy band of SWCX *** addition,the difference between the two methods is not related to the SWCX intensity and,to some extent,to solar wind conditions,because SWCX intensity typically va ries with the

关键词： solar wind charge exchange(SWCX) ROSAT All-Sky Survey(RASS) soft X-ray X-ray imaging magnetosphere

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Real-time Risk-averse Dispatch of an Integrated Electricity and Natural Gas System via Condi-tional Value-at-risk-based Lookup-table Ap-proximate Dynamic Programming

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Protection and Control of Modern Power Systems 2024年第2期9卷 47-60页

作者： Jianquan Zhu Guanhai Li Ye Guo Jiajun Chen Haixin liu Yuhao Luo wenhao liu School of Electric Power Engineering South China University of Tech-nologyGuangzhou 510640China South China University of Technology GuangzhouChina

The real-time risk-averse dispatch problem of an integrated electricity and natural gas system(IEGS)is studied in this *** is formulated as a real-time conditional value-at-risk(CVaR)-based risk-averse dis-patch model in the Markov decision process *** of its stochasticity,nonconvexity and nonlinearity,the model is difficult to analyze by traditional algorithms in an acceptable *** address this non-deterministic polynomial-hard problem,a CVaR-based lookup-table approximate dynamic programming(CVaR-ADP)algo-rithm is proposed,and the risk-averse dispatch problem is decoupled into a series of tractable *** line pack is used as the state variable to describe the impact of one period’s decision on the *** facilitates the reduction of load shedding and wind power *** the proposed method,real-time decisions can be made according to the current information,while the value functions can be used to overview the whole opti-mization horizon to balance the current cost and future risk *** simulations indicate that the pro-posed method can effectively measure and control the risk costs in extreme ***,the decisions can be made within 10 s,which meets the requirement of the real-time dispatch of an *** Terms—Integrated electricity and natural gas system,approximate dynamic programming,real-time dispatch,risk-averse,conditional value-at-risk.

关键词： Integrated electricity and natural gas system approximate dynamic programming real-time dispatch risk-averse conditional value-at-risk

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Surficial modification enabling planar Al growth toward dendrite-free metal anodes for rechargeable aluminum batteries

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Science China Chemistry 2024年第4期67卷 1341-1351页

作者： wenhao liu Yu Li Bo Long Haoyi Yang Lumin Zheng Ying Bai Feng Wu Chuan Wu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China

Al metal possesses ultrahigh theoretical volumetric capacity of 8,040 m Ah cm^(-3),and gravimetric capacity of 2,980 m Ah g^(-1),and thus is highly attractive for electrochemical energy ***,it suffers from several issues,such as the dendrite formation,during Al stripping-deposition cycling,which has been verified to account for the short circuit and limited cyclic ***,we use a facile and applicable method to in-situ reconstruct the Al anode surface with F-Al-O chemical bonds,which could preferentially induce the planar growth of Al along the interface plane,thus leading to the dendrite-free morphology evolution during the *** from F-Al-O chemical bonds on the surface of Al anodes,long lifespan of symmetric cells can be realized even under 1 m A cm^(-2)and 1 m Ah cm^(-2).Coupling the F-Al anode with graphite-based cathodes,high-voltage dual-ion Al metal batteries can be achieved with long-term cycle stability up to 1,200 cycles(at 0.5 m A cm^(-2)),surpassing the counterparts using pristine Al metal ***,the effectiveness of this surficial modification strategy is also elucidated with the aid of theoretical *** work provides novel insights on low-cost and facile strategies against the Al dendrite growth in aluminum batteries.

关键词： rechargeable aluminum batteries Al metal anode Al dendrite dual-ion batteries surficial modification

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Carbon nanocages bridged with graphene enable fast kinetics for dual-carbon lithium-ion capacitors

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Green Energy & Environment 2024年第3期9卷 573-583页

作者： Shani Li Yanan Xu wenhao liu Xudong Zhang Yibo Ma Qifan Peng Xiong Zhang Xianzhong Sun Kai Wang Yanwei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Innovation Academy for Green Manufacture Beijing100190China Beijing Institute of Technology Beijing100081China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Lithium-ion capacitors(LICs) combining the advantages of lithium-ion batteries and supercapacitors are considered a promising nextgeneration energy storage device. However, the sluggish kinetics of battery-type anode cannot match the capacitor-type cathode, restricting the development of LICs. Herein, hierarchical carbon framework(HCF) anode material composed of 0D carbon nanocage bridged with 2D graphene network are developed via a template-confined synthesis process. The HCF with nanocage structure reduces the Li^(+) transport path and benefits the rapid Li^(+) migration, while 2D graphene network can promote the electron interconnecting of carbon nanocages. In addition, the doped N atoms in HCF facilitate to the adsorption of ions and enhance the pseudo contribution, thus accelerate the kinetics of the anode. The HCF anode delivers high specific capacity, remarkable rate capability. The LIC pouch-cell based on HCF anode and active HCF(a-HCF) cathode can provide a high energy density of 162 Wh kg^(-1) and a superior power density of 15.8 kW kg^(-1), as well as a long cycling life exceeding 15,000cycles. This study demonstrates that the well-defined design of hierarchical carbon framework by incorporating 0D carbon nanocages and 2D graphene network is an effective strategy to promote LIC anode kinetics and hence boost the LIC electrochemical performance.

关键词： Hierarchical carbon framework Nanocage ZIF Graphene Lithium-ion capacitors

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Plotinus:A Satellite Internet Digital Twin System

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Journal of Communications and Information Networks 2024年第1期9卷 24-33页

作者： Yue Gao Kun Qiu Zhe Chen Wenjun Zhu Qi Zhang Handong Luo Quanwei Lin Ziheng Yang wenhao liu The Intelligent Networking and Computing Research Center and School of Computer Science Fudan UniversityShanghai 200433China

The development of space-air-ground integrated networks (SAGIN) requires sophisticated satellite Internet emulation tools that can handle complex, dynamic topologies and offer in-depth analysis. Existing emulation platforms struggle with challenges like the need for detailed implementation across all network layers, real-time response, and scalability. This paper proposes a digital twin system based on microservices for satellite Internet emulation,namely Plotinus,which aims to solve these problems. Plotinus features a modular design, allowing for easy replacement of the physical layer to emulate different aerial vehicles and analyze channel interference. It also enables replacing of path computation methods to simplify testing and deploying algorithms. In particular, Plotinus allows for real-time emulation with live network traffic,enhancing practical network models. The evaluation result shows Plotinus’s effective emulation of dynamic satellite networks with real-world devices. Its adaptability for various communication models and algorithm testing highlights Plotinus’s role as a vital tool for developing and analyzing SAGIN systems, offering a cross-layer,real-time,and scalable digital twin system.

关键词： network emulation framework dynamic topology adjustment microservice architecture

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The benefits of PCSK9 inhibitors in patients with acute coronary syndrome:a systematic review and meta-analysis

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Emergency and Critical Care Medicine 2024年第1期4卷 28-34页

作者： Guanzhao Zhang Shuting Chang Faming Zhao Xiangfeng Guan Zifan Nie wenhao liu Bo Li Department of Cardiology Binzhou Medical UniversityZibo Central HospitalZiboShandongChina Weifang Medical University WeifangShandongChina Department of Infectious Disease Zibo Infectious Disease HospitalZiboShandongChina.

Background:Proprotein convertase subtilisin/kexin 9(PSCK9)inhibitors have been beneficial for many patients with *** objective of this study was to investigate the benefit of PSCK9 inhibitors in patients with acute coronary syndrome(ACS).Methods:We systematically searched PubMed,EMBASE,and Cochrane Clinical Trials(published before January 2023;no language restriction)to compare the treatment of patients with ACS using PCSK9 inhibitors and *** primary end points were major adverse cardiovascular events,nonfatal myocardial infarction,cardiogenic death,stroke,hospitalization for recurrent ACS,and coronary ***-or random-effects models were used to assess the aggregated ***:Of the 1686 identified studies,5 were eligible and included in our analysis(of a total of 38,005 participants,18,609 cases were placed in the PCSK9 inhibitor treatment group and 19,396 cases in the placebo group).Compared with the placebo group,PCSK9 inhibitors significantly reduced the major adverse cardiovascular events(odds ratio[OR]:0.83;95%confidence interval[CI]:0.77–0.88;P<0.00001)for patients following *** incidence of nonfatal myocardial infarction(relative risk:0.80;95%CI:0.74–0.87;P<0.00001),cardiovascular death(OR:0.96;95%CI:0.83–1.10;P=0.56),stroke(OR:0.74;95%CI:0.63–0.88;P=0.0007),hospitalization for recurrent ACS(OR:0.57;95%CI:0.40–0.83;P=0.003),or coronary revascularization(OR:0.82;95%CI:0.76–0.88;P<0.00001)all demonstrated a significant decrease in the comparison between the 2 ***:This meta-analysis demonstrated that treatment with PCSK9 inhibitors in patients with ACS reduced the probability of multiple cardiovascular events and improved patient prognosis.

关键词： Acute coronary syndrome Cardiovascular disease PCSK9 inhibitors

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大都市近郊地区国土空间规划技术框架--以成都市郫都区为例

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规划师 2024年第1期40卷 137-143页

作者：刘欣刘文豪成都市规划设计研究院规划五所

在国家推动城乡融合、促进乡村振兴与超大特大城市转型发展的时代背景下,大都市近郊地区成为探索城乡融合发展路径的前沿阵地。以成都市郫都区为研究对象展开分析,针对其面临的现状生活服务设施难以匹配人群多元化的需求、生产空间难以... 详细信息

在国家推动城乡融合、促进乡村振兴与超大特大城市转型发展的时代背景下,大都市近郊地区成为探索城乡融合发展路径的前沿阵地。以成都市郫都区为研究对象展开分析,针对其面临的现状生活服务设施难以匹配人群多元化的需求、生产空间难以支撑新业态转型发展、土地破碎难以满足高品质环境需求等问题,提出规划应对策略:完善城乡居住网络、服务体系,促进生活融合;健全产业生态、优化空间布局,推动产业建圈强链,促进生产融合;构建城乡公园体系、整合空间管控,促进生态融合;完善规划传导体系、政策体系、标准体系,保障规划落地。

关键词：大城市近郊地区城乡融合国土空间规划成都市郫都区

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基于节能优化的电动汽车跟随控制研究

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武汉大学学报（工学版） 2024年第5期57卷 654-661页

作者：专祥涛刘文豪武汉大学电气与自动化学院湖北武汉430072 武汉大学深圳研究院广东深圳518057

以电动汽车为研究对象,在完成汽车跟随任务的前提下,对跟随过程中的汽车能耗进行优化。通过分析行驶中的电动汽车的受力情况,建立电动汽车能耗模型,并提出了基于遗传算法和最大转矩电流比方法的分层控制策略。该策略上层基于能耗模型采... 详细信息

以电动汽车为研究对象,在完成汽车跟随任务的前提下,对跟随过程中的汽车能耗进行优化。通过分析行驶中的电动汽车的受力情况,建立电动汽车能耗模型,并提出了基于遗传算法和最大转矩电流比方法的分层控制策略。该策略上层基于能耗模型采用遗传算法在不同场景下求解使电动汽车能耗最小的速度曲线;下层使用模型预测控制对该速度曲线进行跟踪,并采用最大转矩电流比方法对电机能耗进行优化。设计了多种不同跟随场景对所提策略与传统控制策略进行仿真对比,仿真结果表明:相比于传统控制策略,在各种场景下该分层控制策略均能有效减少电动汽车在行驶过程中的能耗,降低行驶成本。

关键词：电动汽车节能控制分层控制遗传算法最大转矩电流比

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基于VARI工艺的碳纤维复合材料快速修理飞机铝合金裂纹的研究

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材料导报 2024年第6期38卷 205-210页

作者：汪愿孙运刚符彬刘文浩宣善勇刘鹏国营芜湖机械厂安徽芜湖241007 安徽省航空复合材料维修工程技术研究中心安徽芜湖241007

考虑到飞机战伤抢修需求,在现有的复合材料胶接修理基础上提出了一种基于真空辅助树脂灌注(VARI)工艺的金属裂纹快速修理方法,通过静力拉伸和疲劳实验将VARI修理工艺与传统湿法胶接修理工艺、机械补强修理工艺进行对比,获得了不同修理... 详细信息

考虑到飞机战伤抢修需求,在现有的复合材料胶接修理基础上提出了一种基于真空辅助树脂灌注(VARI)工艺的金属裂纹快速修理方法,通过静力拉伸和疲劳实验将VARI修理工艺与传统湿法胶接修理工艺、机械补强修理工艺进行对比,获得了不同修理工艺下实验件的静强度恢复率、疲劳寿命、修理时间及比静拉伸强度恢复率,借助有限元分析法深入研究了VARI修理件的损伤过程,并以比静拉伸强度恢复率为指标,利用Design Expert软件进一步优化了修理补片参数。结果表明:在三种修理工艺中,VARI修理工艺效果最佳,采用VARI修理的实验件静强度能恢复至完好实验件的90.3%,疲劳寿命相比未修理实验件增长了31.4倍;与传统湿法胶接修理相比,采用VARI修理可将修理时间缩短60.2%;与机械补强修理相比,采用VARI修理可将实验件增重降低53.5%,比静拉伸强度恢复率提高146.6%;对于长度为20 mm的裂纹,补片长度60 mm、宽度64.8 mm、铺层数目四层(即补片厚度1 mm)为最优补片参数。

关键词：飞机铝合金裂纹真空辅助树脂灌注修理疲劳寿命比静拉伸强度恢复率有限元模拟

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新型农业经营主体发展具有小农户包容性吗

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经济理论与经济管理 2024年第6期44卷 37-56页

作者：梁巧韩子名刘文昊浙江大学中国农村发展研究院 310058 浙江大学公共管理学院 310058

本文基于中国家庭大数据库等微观调研数据,将村庄数据和微观农户数据进行匹配,实证估计了新型农业经营主体对村庄内小农户增收和收入不平等的影响,并进行包容性分析和影响机制检验。研究发现:(1)新型农业经营主体对村庄内小农户的农业... 详细信息

本文基于中国家庭大数据库等微观调研数据,将村庄数据和微观农户数据进行匹配,实证估计了新型农业经营主体对村庄内小农户增收和收入不平等的影响,并进行包容性分析和影响机制检验。研究发现:(1)新型农业经营主体对村庄内小农户的农业经营性收入和家庭总收入起到了显著的正向提升作用。(2)新型农业经营主体降低了小农户的收入不平等程度,对较低收入队列小农户的家庭总收入的促进作用较强,且其增收效应在不同人力、物质和社会资本水平的小农户之间并无明显差异,体现了包容性。(3)新型农业经营主体主要通过促进土地流转和降低土地细碎化程度、调整种植结构、推动农业机械化、开展农业技术培训等机制,促进了小农户农业经营性收入和家庭总收入的提高。

关键词：新型农业经营主体小农户增收小农户包容性

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