检索结果-南通市图书馆

Urea-induced interfacial engineering enabling highly reversible aqueous zinc-ion battery

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1599-1609页

作者： Bin-Rui Xu Quan-An Li Yong Liu Guang-Bin Wang Zi-He zhang Feng-zhang ren School of Material Science and Engineering Henan University of Science and Technology School of Information Engineering Henan University of Science and Technology Longmen Laboratory Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing Technology

Aqueous zinc-ion batteries（AZIBs） have been regarded as prospective rechargeable energy storage devices because of the high theoretical capacity and low redox potential of Zn metal.However,the uncontrollable formation of dendrites and the water-induced side reactions at the Zn/electrolyte interface,and the poor reversibility under a high current density(> 2 mA·cm-2) and large area capacity(>2 mAh·cm-2) still limit the practical applications of AZIBs.Therefore,a strategy that can overcome these difficulties is urgently needed.Here,we introduce an environmentally friendly and low-cost additive,namely urea,to the electrolyte of AZIBs to induce uniform Zn deposition and suppress the side reactions.Measurements of the adsorption behavior,electrochemical characterization,and observations of the morphology revealed the interfacial modification induced by urea on the Zn/electrolyte interface,demonstrating its huge potential in AZIBs.Consequently,the long-term cycling stability（over2100 h） of a Zn/Zn symmetric cell under a high current density of 5 mA·cm-2and a capacity of 5 mAh·cm-2was achieved with a 1 mol·L-1ZnSO4electrolyte with the urea additive.Additionally,the assembled Zn/NH4V4O10full cell with urea exhibited excellent cycling performance and an outstanding average Coulombic efficiency of 99.98%.These results indicate that this is a low-cost and effective additive strategy for realizing highly reversible AZIBs.

关键词： Zn anode Urea additive Interface engineering Dendrite growth Side reaction

Self-assembly of differentiated dental pulp stem cells facilitates spheroid human dental organoid formation and prevascularization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2024年第3期16卷 287-304页

作者： Fei Liu Jing Xiao Lei-Hui Chen Yu-Yue Pan Jun-zhang Tian Zhi-ren zhang Xiao-Chun Bai School of Basic Medical Sciences Southern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Health Management Guangdong Second Provincial General HospitalGuangzhou 510317Guangdong ProvinceChina Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment Zhuhai People’s Hospital Affiliated with Jinan UniversityZhuhai 519000Guangdong ProvinceChina Centre of Reproduction Development and AgingFaculty of Health SciencesUniversity of MacaoMacao 999078China Department of Stomatology Guangdong Second Provincial General HospitalGuangzhou 510317Guangdong ProvinceChina Zhuhai Institute of Translational Medicine Zhuhai Hospital Affiliated with Jinan UniversityZhuhai 519000Guangdong ProvinceChina Department of Cell Biology School of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515Guangdong ProvinceChina

BACKGROUND The self-assembly of solid organs from stem cells has the potential to greatly expand the applicability of regenerative medicine.Stem cells can self-organise into microsized organ units,partially modelling tissue function and regeneration.Dental pulp organoids have been used to recapitulate the processes of tooth development and related diseases.However,the lack of vasculature limits the utility of dental pulp organoids.AIM To improve survival and aid in recovery after stem cell transplantation,we demonstrated the three-dimensional(3D)self-assembly of adult stem cell-human dental pulp stem cells(hDPSCs)and endothelial cells(ECs)into a novel type of spheroid-shaped dental pulp organoid in vitro under hypoxia and conditioned medium(CM).METHODS During culture,primary hDPSCs were induced to differentiate into ECs by exposing them to a hypoxic environment and CM.The hypoxic pretreated hDPSCs were then mixed with ECs at specific ratios and conditioned in a 3D environment to produce prevascularized dental pulp organoids.The biological characteristics of the organoids were analysed,and the regulatory pathways associated with angiogenesis were studied.RESULTS The combination of these two agents resulted in prevascularized human dental pulp organoids(Vorganoids)that more closely resembled dental pulp tissue in terms of morphology and function.Single-cell RNA sequencing of dental pulp tissue and RNA sequencing of Vorganoids were integrated to analyse key regulatory pathways associated with angiogenesis.The biomarkers forkhead box protein O1 and fibroblast growth factor 2 were identified to be involved in the regulation of Vorganoids.CONCLUSION In this innovative study,we effectively established an in vitro model of Vorganoids and used it to elucidate new mechanisms of angiogenesis during regeneration,facilitating the development of clinical treatment strategies.

关键词： Human dental pulp stem cells Prevascularized organoids Integrated analyses Angiogenesis Forkhead box protein O1

Snake-Hot-Eye-Assisted Multi-Process-Fusion Target Tracking Based on a Roll-Pitch Semi-strapdown Infrared Imaging Seeker

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2022年第4期19卷 1124-1139页

作者： Jian Chen Zichao zhang Ke Yi Yu Han zhang ren College of Engineering China Agricultural UniversityBeijing 100083China Key Laboratory of Urban Land Resources Monitoring and Simulation Ministry of Natural ResourcesShenzhen 518000China Systems Engineering Research Institute China State Shipbuilding Corporation LimitedBeijing 100094China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Aiming at intercepting large maneuvering targets precisely,the guidance law of advanced self-seeking missiles requires not only inertial line-of-sight(LOS)angular rate but also target maneuvering acceleration.Moreover,the semi-strapdown stabilization platform has lost the ability to measure the inertial LOS angular rate directly,which needs to be extracted by numerical calculation.The differential operation commonly used in traditional methods can magnify the measurement error of the sensor,resulting in insufficient calculation accuracy of the line-of-sight angular rate.By analyzing the mathematical relationship between the missile-target relative motion and the angle tracking system,a multi-process-fusion integrated filter model of relative motion and angle tracking is presented.To overcome the defect that the infrared seeker cannot directly measure the missile-target distance,following the snake-hot-eye visual mechanism,a visual bionic imaging guidance method of estimating the missile-target relative distance from the infrared images is proposed to improve the observability of the filter model.Finally,target-tracking simulations verify that the estimation accuracy of target acceleration is improved by four times.

关键词： Roll-pitch semi-strapdown Infrared imaging seeker Target tracking Biological visual mechanism Snake hot eye Integrated filter

Cooperative differential games guidance laws for multiple attackers against an active defense target

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第5期35卷 374-389页

作者： Fei LIU Xiwang DONG Qingdong LI zhang ren School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control LaboratoryBeihang UniversityBeijing 100083China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang UniversityBeijing 100083China Key Laboratory of Dependable Service Computing in Cyber Physical Society Ministry of Education of ChinaChongqing UniversityChongqing 400044China

This paper is concerned with a scenario of multiple attackers trying to intercept a target with active defense.Three types of agents are considered in the guidance:The multiple attackers,the target and the defender,where the attackers aim to pursuit the target from different directions and evade from the defender simultaneously.The guidance engagement is formulated in the framework of a zero-sum two-person differential game between the two opposing teams,such that the measurements on the maneuver of the target or estimations on the defending strategy of the defender can be absent.Cooperation of the attackers resides in two aspects:redundant interception under the threat of the defender and the relative intercept geometry with the target.The miss distances,the relative intercept angle errors and the costs of the agents are combined into a single performance index of the game.Such formulation enables a unitary approach to the design of guidance laws for the agents.To minimize the control efforts and miss distances for the attackers,an optimization method is proposed to find the best anticipated miss distances to the defender under the constraint that the defender is endowed with a capture radius.Numerical simulations with two cases are conducted to illustrate the effectiveness of the proposed cooperative guidance law.

关键词： Active defense Cooperative guidance Differential games Minimum effort optimization Relative intercept angle

Distributed state estimation for heterogeneous mobile sensor networks with stochastic observation loss

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第2期35卷 265-275页

作者： Yingrong YU Jianglong YU Yishi LIU zhang ren Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical EngineeringBeihang.UniversityBeijing 100191China

The problem of distributed fusion and random observation loss for mobile sensor networks is investigated herein.In view of the fact that the measured values,sampling frequency and noise of various sensors are different,the observation model of a heterogeneous network is constructed.A binary random variable is introduced to describe the drop of observation component and the topology switching problem caused by complete observation loss is also considered.A cubature information filtering algorithm is adopted to design local filters for each observer to suppress the negative effects of measurement noise.To derive a consistent and accurate estimation result,a novel weighted average consensus-based filtering approach is put forward.For the sensor that suffers from observation loss,its local prediction information vector is fused with the information contribution vectors of the neighbors to obtain the local estimation.Then the consensus weight matrix is designed for consensus-based distributed collaborative information fusion.The boundness of the estimation errors is proved by employing the stochastic stability theory.In the end,two numerical examples are offered to assert the validity of the presented method.

关键词： Consistency theorem Heterogeneous sensor networks Information fusion State estimation Stochastic boundedness

Multi-agent differential game based cooperative synchronization control using a data-drivenmethod

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2022年第7期23卷 1043-1056页

作者： Yu SHI Yongzhao HUA Jianglong YU Xiwang DONG zhang ren School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Institute of Artificial Intelligence Beihang UniversityBeijing 100191China

This paper studies the multi-agent differential game based problem and its application to cooperative synchronization control.A systematized formulation and analysis method for the multi-agent differential game is proposed and a data-driven methodology based on the reinforcement learning(RL)technique is given.First,it is pointed out that typical distributed controllers may not necessarily lead to global Nash equilibrium of the differential game in general cases because of the coupling of networked interactions.Second,to this end,an alternative local Nash solution is derived by defining the best response concept,while the problem is decomposed into local differential games.An off-policy RL algorithm using neighboring interactive data is constructed to update the controller without requiring a system model,while the stability and robustness properties are proved.Third,to further tackle the dilemma,another differential game configuration is investigated based on modified coupling index functions.The distributed solution can achieve global Nash equilibrium in contrast to the previous case while guaranteeing the stability.An equivalent parallel RL method is constructed corresponding to this Nash solution.Finally,the effectiveness of the learning process and the stability of synchronization control are illustrated in simulation results.

关键词： Multi-agent system Differential game Synchronization control Data-driven Reinforcement learning

Online hierarchical recognition method for target tactical intention in beyond-visual-range air combat

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第8期18卷 1349-1361页

作者： Zhen Yang Zhi-xiao Sun Hai-yin Piao Ji-chuan Huang De-yun Zhou zhang ren School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191China Northwestern Polytechnical University Xi'an710072China The First Military Representative Office of the Air Force Equipment Department in Chengdu Chengdu610091China

Online accurate recognition of target tactical intention in beyond-visual-range (BVR) air combat is an important basis for deep situational awareness and autonomous air combat decision-making, which can create pre-emptive tactical opportunities for the fighter to gain air superiority. The existing methods to solve this problem have some defects such as dependence on empirical knowledge, difficulty in interpreting the recognition results, and inability to meet the requirements of actual air combat. So an online hierarchical recognition method for target tactical intention in BVR air combat based on cascaded support vector machine (CSVM) is proposed in this study. Through the mechanism analysis of BVR air combat, the instantaneous and cumulative feature information of target trajectory and relative situation information are introduced successively using online automatic decomposition of target trajectory and hierarchical progression. Then the hierarchical recognition model from target maneuver element, tactical maneuver to tactical intention is constructed. The CSVM algorithm is designed for solving this model, and the computational complexity is decomposed by the cascaded structure to overcome the problems of convergence and timeliness when the dimensions and number of training samples are large. Meanwhile, the recognition result of each layer can be used to support the composition analysis and interpretation of target tactical intention. The simulation results show that the proposed method can effectively realize multi-dimensional online accurate recognition of target tactical intention in BVR air combat.

关键词： Beyond-visual-range(BVR)air combat Tactical intention recognition Hierarchical recognition model Cascaded support vector machine(CSVM) Trajectory decomposition Maneuver element

在线全文

学校读者我要写书评

暂无评论

拉丁美洲本土现代化的兴起、特征与挑战

中央民族大学学报（哲学社会科学版） 2024年第2期51卷 47-55页

作者：张青仁中央民族大学民族学与社会学学院北京100081

19世纪初,在摆脱西班牙人的殖民统治,实现国家独立后,拉丁美洲的政治精英持续发起了效仿西方的现代化改革,并表现为19世纪的政治现代化、20世纪的经济现代化两个阶段。持续两百多年的现代化改革,并没有推动拉美社会的发展进步。20世纪6... 详细信息

19世纪初,在摆脱西班牙人的殖民统治,实现国家独立后,拉丁美洲的政治精英持续发起了效仿西方的现代化改革,并表现为19世纪的政治现代化、20世纪的经济现代化两个阶段。持续两百多年的现代化改革,并没有推动拉美社会的发展进步。20世纪60年代后,依附理论揭开了西方对拉丁美洲支配的历史与现实,解构了以西方为核心的“现代化”的普适性与合法性。人类学研究继承了依附理论的批判主张,重构现代化理论与实践的多元面向,并通过微观的民族志研究,确定了土著、农民等社会大众在现代化进程中的主体地位。基于拉美社会杂糅文化之上的“文化现代化”的主张得以生成。20世纪90年代以来,墨西哥萨帕塔民族解放运动和厄瓜多尔、玻利维亚等安第斯国家发起了以本土文化为依托、以大众为主体的本土现代化实践。拉丁美洲本土现代化面临平衡本土文明的弘扬与现代化的发展,文化现代化能否推动政治经济变革以及全球资本、统治精英的持续抵抗等诸多挑战。在百年未有之大变局的当下,应当增进中拉文明的交流互鉴,丰富中国式现代化与拉美本土现代化的内涵,推动现代化理论体系的更新,为全球发展和全球安全夯实基础。

关键词：拉丁美洲本土现代化共生共识积极社会

构式路径的应用与扩展——《构式语法:英语的结构》评介

在线全文

学校读者我要写书评

暂无评论

当代语言学 2024年第2期26卷 311-316页

作者：傅宏杰张韧陕西师范大学外国语学院

1.引言《构式语法:英语的结构》(Construction Grammar:The Structure of English)是Thomas Hoffmann 2022年在剑桥大学出版社出版的著作。本书是继Hilpert(2019[2014])之后第二本专门的构式语法教材。Hilpert(2014)打破了构式语法长期没有教材的窘境①,而本书则体现了构式语法近期发展的一些新特点。因此,本文将在与Hilpert(2019[2014])进行对比的基础上重点评介本书的几个突出特点,同时指出其不足之处。

关键词：剑桥大学出版社应用与扩展构式语法 :英语评介