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Hollow cubic MnS-CoS_(2)-NC@NC designed by two kinds of nitrogen-doped carbon strategy for sodium ion batteries with ultraordinary rate and cycling performance

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Nano Research 2022年第4期15卷 3273-3282页

作者： ruipeng wei Yutao Dong Yingying Zhang Xiyang Kang Xia Sheng Jianmin Zhang College of Science Henan Agricultural UniversityZhengzhou 450002China College of Chemistry Zhengzhou UniversityZhengzhou 450001China

In order to obtain an advanced anode material that exhibits excellent electrochemical performance in sodium ion batteries,a hollow nanocube MnS-CoS_(2)-NC@NC(NC=nitrogen-doped carbon)with two kinds of nitrogen-doped carbon was synthesized by simple one-step *** of the two kinds of nitrogen-doped carbon comes from the organic ligands in the precursor being mixed in the sulfide after calcination,and the other comes from the calcination of the coated polydopamine(PDA)to form a carbon shell wrapped outside the *** characteristic nanostructure with two kinds of nitrogen-doped carbon can not only improve the overall conductivity of the electrode material,which is obviously beneficial to the rapid transmission of sodium ions and thus outstanding rate performance,but also can alleviate volume expansion to maintain battery cycle *** the half-cell,the MnS-CoS_(2)-NC@NC electrode not only provides an ultra-high specific capacity of 608.5 mA·h·g^(-1)at 0.2 A·g^(-1)for 100 cycles,but also shows an outstanding rate performance of 560.5 mA·h·g^(-1)at 5.0 A·g^(-1)for 1,100 *** in a full-cell composed with Na3V2(PO4)3 as the positive material,it can still maintain a capacity of 436.7 mA·h·g^(-1)after 900 cycles at 1.0 A·g^(-1).In order to explore its sodium storage mechanism,in-situ and ex-situ X-ray diffraction(XRD)tests were carried out to prove that CoS_(2)and MnS were reduced to produce metallic Co and metallic Mn during the discharging process,respectively,and reversibly returned during the charging process.

关键词： MnS CoS_(2) hollow nanocube nitrogen-doped carbon sodium ion battery

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Insights into the sandwich-like ultrathin Ni-doped MoS_(2)/rGO hybrid as effective sulfur hosts with excellent adsorption and electrocatalysis effects for lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第9期30卷 85-94页

作者： Ran Zhang Yutao Dong Mohammed AAl-Tahan Yingying Zhang ruipeng wei Yuhang Ma Changchun Yang Jianmin Zhang College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 450001China College of Science Henan Agricultural UniversityZhengzhou 450002China

The design of sulfur hosts with high conductivity,large specific surface area,strong adsorption and electrocatalytic ability is crucial to advance high performance lithium-sulfur ***,a novel ultrathin sandwich-type Ni-doped MoS_(2)/reduced graphene oxide(denote as Ni-doped MoS_(2)/rGO) hybrid is developed as a sulfur host through a simple one-step hydrothermal *** two-dimensional layered structure Ni-doped MoS_(2)/rGO hybrid with heterostructure and heteroatom architecture defects not only plays a key role in adsorption of lithium polysulfide but also catalyzes on redox kinetics of sulfur and polysulfide ***,it can contribute to the large specific surface area for Li_(2) S/S_8 deposition,fast Li-ion and electron transportation,thus enhancing the electrocatalytic properties,as confirmed firstly by cyclic voltammetry(CV) *** to the adsorption-catalytic synergistic effect,the Ni-doped MoS_(2)/rGO cathode exhibits high specific capacity(1343.6 mA h g^(-1) at 0.2 C,921.6 mA h g^(-1) at 1 C),high coulombic efficiency and an outstanding cycle stability(with the low attenuation rate of 0.077% per cycle over 140 cycles at 0.5 C and 0.11% per cycle over 400 cycles at 1 C,respectively).This work proposes some inspiration for exploring the construction of advanced lithium-sulfur batteries through the rational design defects of atomic structure and electronic states of MoS_(2) as sulfur host.

关键词： MoS_(2) Defect Self-assembly Electrocatalysis Lithium-sulfur batteries

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基于序增量功率电流方向追溯电压暂降源的方法

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电力系统自动化 2017年第6期41卷 86-91页

作者：唐轶魏瑞鹏李鹏漆炜之中国矿业大学信息与电气工程学院江苏省徐州市221008 国网淮安供电公司江苏省淮安市223002

电压暂降已经成为最受关注的电能质量问题之一。提出一种基于序增量功率电流方向追溯电压暂降源的方法。首先以电流、电压互感器的同名端确定一个监测点的正参考方向。监测点的正序增量功率电流为正,三相对称电压暂降源位于监测点正参... 详细信息

电压暂降已经成为最受关注的电能质量问题之一。提出一种基于序增量功率电流方向追溯电压暂降源的方法。首先以电流、电压互感器的同名端确定一个监测点的正参考方向。监测点的正序增量功率电流为正,三相对称电压暂降源位于监测点正参考方向的相同方向,即下游,反之则在上游;监测点的负序增量功率电流为正,三相不对称电压暂降源位于监测点正参考方向的相反方向,即上游,反之则在下游。仿真及实验室模拟测试都证明:所提出的追溯电压暂降源的方法能准确地追溯辐射式配电网中由各种电网故障引起的电压暂降源。该方法计算简单、运算量小,适合于单片机完成,可嵌入在继电保护器中,由保护器完成电压暂降源的追溯。

关键词：电能质量电压暂降序增量功率电流源定位

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Dynamic event-triggered data-driven iterative learning bipartite tracking control for nonlinear MASs with prescribed performance

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Science China(Information Sciences) 2025年第1期68卷 292-305页

作者： Tao SHI wei-wei CHE School of Mechatronic Engineering and Automation Shanghai University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University College of Information Science and Engineering Northeastern University

This article proposes a distributed dynamic event-triggered data-driven iterative learning control(DET-DDILC)scheme under a predefined performance to tackle the bipartite tracking control problem for multiagent systems(MASs). An improved dynamic linearization technique is utilized to convert the nonlinear MASs into an iterative linear data model. First,a peer-to-peer mapping function is introduced to map the constrained distributed system output homeomorphism to an unconstrained one. In addition, a DET mechanism based on a time-iteration-varying function is devised to conserve network communication resources. Based on the unconstrained transformation and the designed DET mechanism, the DET-DDILC algorithm is devised to ensure that the bipartite tracking performance of MASs can be within the preset range. Finally, the effectiveness and feasibility of the designed control scheme are demonstrated via a simulation case by a comparison.

关键词： bipartite tracking control prescribed performance event-triggered iterative learning control multiagent systems

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Bionic breathable open framework ionomer for medium-temperature fuel cells

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Science China Chemistry 2025年第2期68卷 407-408页

作者： Zidong wei State Key Laboratory of Advanced Chemical Power Sources School of Chemistry&Chemical EngineeringChongqing UniversityChongqing 400044China

Hydrogen,a green and sustainable energy source characterized by its abundance,zero emission,and high-volumetric energy density,is widely recognized as the fuel of the future and a crucial driver of the global energy *** exchange membrane fuel cells(PEMFCs),renowned for their high energy conversion efficiency,environmental compatibility,and low noise,have become pivotal in hydrogen energy applications[1,2].As the demand for clean energy increases across various application scenarios,expectations for fuel cells to achieve high output power density,simplified thermal management,and improved tolerance to impurity gases are growing.A promising solution is to increase the operating temperature to develop medium-temperature PEMFCs(MT PEMFCs),which bridges the gap between low-temperature fuel cells and high-temperature phosphoric acid fuel *** approach significantly enhances catalyst activity and theoretically improves electrochemical reaction kinetics[3].Elevated temperatures also reduce heat rejection,leading to simplified thermal management systems,and enhance the catalyst’s resistance to gas impurities such as carbon monoxide,thereby broadening the range of usable hydrogen sources[3].

关键词： transition simplified catalyst

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战术通信系统超短波电台网频率指配研究

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国防科技 2016年第6期37卷 131-134页

作者：刘锐鹏谭薇西安通信学院陕西西安710106 国防信息学院湖北武汉430010

针对新一代战术通信系统中超短波电台组网易自扰、互扰的问题,基于联合作战背景分析了师区域间超短波频率空分复用模型,给出超短波电台网频率规划的约束与假设条件,研究基于着色理论的超短波电台网频率指配方法及自动化实现步骤。

关键词：战术通信系统超短波电台网频率指配

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Mode-switching cooperative defense strategy for the orbit pursuit-evasion-defense game

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Defence Technology(防务技术) 2025年第2期44卷 272-286页

作者： Yongshang wei Tianxi Liu Cheng wei School of Aerospace Harbin Institute of TechnologyHarbin150000China

This paper presents a mode-switching collaborative defense strategy for spacecraft pursuit-evasiondefense *** these scenarios,the pursuer tries to avoid the defender while capturing the evader,while the evader and defender form an alliance to prevent the pursuer from achieving its ***,the behavioral modes of the pursuer,including attack and avoidance modes,were established using differential game *** modes are then recognized by an interactive multiple model-matching algorithm(IMM),that uses several smooth variable structure filters to match the modes of the pursuer and update their probabilities in real *** on the linear-quadratic optimization theory,combined with the results of strategy identification,a two-way cooperative optimal strategy for the defender and evader is proposed,where the evader aids the defender to intercept the pursuer by performing luring *** results show that the interactive multi-model algorithm based on several smooth variable structure filters perform well in the strategy identification of the pursuer,and the cooperative defense strategy based on strategy identification has good interception performance when facing pursuers,who are able to flexibly adjust their game objectives.

关键词： Cooperative policy Differential games Orbit pursuit-evasion-defense game Mod recognition

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Sharp Isolated Toughness Bound for Fractional(k,m)-Deleted Graphs

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Acta Mathematicae Applicatae Sinica 2025年第1期41卷 252-269页

作者： wei GAO wei-fan WANG Yao-jun CHEN School of Mathematics Hohai UniversityNanjing 210098China Department of Mathematics Zhejiang Normal UniversityJinhua 321004China Department of Mathematics Nanjing UniversityNanjing 210093China

A graph G is a fractional(k,m)-deleted graph if removing any m edges from G,the resulting subgraph still admits a fractional *** k≥2 and m≥1 be ***[2m/k]^(*)=[2m/k]if 2m/k is not an integer,and[2m/k]^(*)=[2m/k]-1 if 2m/k is an *** this paper,we prove that G is a fractional(k,m)-deleted graph if δ(G)≥k+m and isolated toughness meets I(G)>{3-1/m,if k=2 and m≥3,k+[2m/k]^(*)m+1-[2m/k]^(*);***,we show that the isolated toughness bound is tight.

关键词： graph isolated toughness fractional k-factor fractional(k,m)-deleted graph

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Modeling the potential distribution of Argentine shortfin squid in the southwest Atlantic Ocean

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Journal of Oceanology and Limnology 2025年第1期43卷 326-340页

作者： Hewei LIU wei YU College of Marine Living Resource Sciences and Management Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for Oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai Ocean UniversityShanghai 201306China Key Laboratory of Oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai Ocean UniversityShanghai 201306China

The Argentine shortfin squid Illex argentinus is an economically important short-lived species widely distributed in the southwest Atlantic *** abundance and distribution of *** are associated with climate change and environmental *** potential distribution of *** was modeled with various environmental variables including sea surface temperature(SST),sea surface height(SSH),chlorophyll a,sea surface salinity(SSS),net primary productivity(NPP),mixed layer depth(MLD),eddy kinetic energy(EKE),and photosynthetically active radiation(PAR)using the maximum entropy(MaxEnt)approach during the peak fishing seasons(January–April).The habitat suitability index(HSI)was defined as the probability of species emergence from the MaxEnt model and the area of HSI≥0.6 was regarded as *** indicate that the predicted habitat correlated with the actual fishing position,with similar trends in the percentages of suitable habitats and catch per unit effort(CPUE)of *** from January to ***,SST,SSH,PAR,and MLD were identified critical environmental variables for the distribution of *** addition,the median of preferred ranges of the critical environmental variables were concentrated within the suitable habitats of *** Area under the Receiver Operating Characteristic Curve(AUC)was greater than 0.96 for all four *** in latitudinal and longitudinal gravity centers(LATG and LONG)of fishing effort were consistent with latitudinal and longitudinal gravity centers(LATG_H and LONG_H)of the *** findings suggest that the MaxEnt model is an effective tool to predict the potential distribution of ***,SST,SSH,PAR,and MLD should be given with more extensive attention in predicting the potential distribution of ***,as they are important environmental indicators that can help decision-makers search for the fishing ground of *** in the Southwest Atlantic.

关键词： Illex argentinus maximum entropy model potential distribution oceanographic environmental condition

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Visual electrophysiological assessment of children with poor response to treatment for functional amblyopia

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International Journal of Ophthalmology(English edition) 2025年第2期18卷 315-322页

作者： Dong-Qing Yuan wei-wei Zhang Liu-wei Gu Qing-Huai Liu Department of Ophthalmology Jiangsu Province Hospitalthe First Affiliated Hospital of Nanjing Medical UniversityJiangsu Women and Children Health HospitalNanjing 210029Jiangsu ProvinceChina

AIM:To assess the visual electrophysiological outcomes in children with functional amblyopia who exhibited poor response to conventional ***:Twenty-one children with functional amblyopia,aged 5.7±2.1y(range:4-10y),underwent comprehensive ophthalmic and refractive *** domain-optical coherence tomography(SD-OCT)and multifocal electroretinography(mfERG)were conducted to analyze the macular retinal thickness and the first-order response P1 ring of the mfERG in the amblyopic eye(AE)compared to the fellow good eye(GE).RESULTS:Initially,visual acuity in the AE ranged from 20/800 to 20/40,while the GE exhibited a range of 20/25 to 20/20(P<0.01).After 6mo of treatment,17 patients demonstrated improved visual acuity in the AE to 20/50 or better,while 4 children showed no ***-OCT revealed comparable macular and optic disc structures between the AE and *** to treatment,the mfERG P1 ring amplitude was significantly reduced in the AE compared to GE(P<0.05).The AE/GE ratio of P1 ring amplitude showed significant improvement ***,a smaller AE/GE ratio before treatment was associated with poorer improvement ***:In the management of functional amblyopia,a thorough assessment of amblyopic eye examinations is *** 20%of amblyopic eyes may not achieve significant improvement in visual acuity,despite the absence of detectable organic retinal *** may reveal underlying *** mfERG into initial assessments or treatment follow-ups can aid in identifying potential hidden retinal defects and predicting the prognosis of the amblyopic eye.

关键词： functional amblyopia poor response optical coherence tomography multifocal electroretinography retinal defects

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