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| 1 | Distributed cooperative guidance for multiple missiles with fixed and switching communication topologies显示文摘This study investigates cooperative guidance problems for multiple missiles with fixed and switching directed communication topologies. A two-step guidance strategy is proposed to realize the simultaneous attack. In the first step, a distributed cooperative guidance law is designed using local neighboring information for multiple missiles to achieve consensus on range-to-go and leading angle. The second step begins when the consensus of multiple missiles is realized. During the second step, multiple missiles disconnect from each other and hit the target using the proportional navigation guidance law. First, based on the local neighboring communications, a sufficient condition for multiple missiles to realize simultaneous attack with a fixed communication topology is presented, where the topology is only required to have a directed spanning tree. Then,the results are extended to the case of switching communication topologies. Finally, numerical simulations are provided to validate the theoretical results. | Qilun ZHAO Xiwang DONG Zixuan LIANG Chen BAI Jian CHEN Zhang REN | 2017 | Chinese Journal of Aeronautics2017，30，4： | 27 |
| 2 | Modified Cuckoo Search Algorithm to Solve Economic Power Dispatch Optimization Problems显示文摘A modified cuckoo search(CS) algorithm is proposed to solve economic dispatch(ED) problems that have nonconvex, non-continuous or non-linear solution spaces considering valve-point effects, prohibited operating zones, transmission losses and ramp rate limits. Comparing with the traditional cuckoo search algorithm, we propose a self-adaptive step size and some neighbor-study strategies to enhance search performance.Moreover, an improved lambda iteration strategy is used to generate new solutions. To show the superiority of the proposed algorithm over several classic algorithms, four systems with different benchmarks are tested. The results show its efficiency to solve economic dispatch problems, especially for large-scale systems. | Jian Zhao Shixin Liu Mengchu Zhou Xiwang Guo Liang Qi | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，4： | 14 |
| 3 | Cooperative guidance strategy for multiple hypersonic gliding vehicles system显示文摘Cooperative guidance strategy for multiple hypersonic gliding vehicles system with flight constraints and cooperative constraints is investigated.This paper mainly cares about the coordination of the entry glide flight phase and driving-down phase.Different from the existing results,both the attack time and the attack angle constraints are considered simultaneously.Firstly, for the entry glide flight phase, a two-stage method is proposed to achieve the rapid cooperative trajectories planning, where the control signal corridors are designed based on the quasi-equilibrium gliding conditions.In the first stage, the bank angle curve is optimized to achieve the attack angle coordination.In the second stage, the angle of attack curve is optimized to achieve the attack time coordination.The optimized parameters can be obtained by the secant method.Secondly, for the driving-down phase, the cooperative terminal guidance law is designed where the terminal attack time and attack angle are considered.The guidance law is then transformed into the bank angle and angle of attack commands.The cooperative guidance strategy is summarized as an algorithm.Finally, a numerical simulation example with three hypersonic gliding vehicles is provided for revealing the effectiveness of the acquired strategy and algorithm. | Jianglong YU Xiwang DONG Qingdong LI Zhang REN Jinhu LV | 2020 | Chinese Journal of Aeronautics2020，33，3： | 14 |
| 4 | Attitude Control for Spacecraft with Swinging Large-scale Payload显示文摘天文学观察卫星(AOS ) 的主要传感器在与卫星平台直接连接并且有自由的二度的一个万向节库上被装。为有一个热闹传感器的 AOS 的态度控制将在这份报纸被加亮。由于传感器的非可以忽略的团和长度,在卫星和传感器之间的内部运动将改变态度,质量的中心和系统的惯性的时刻的位置(由卫星和传感器组成) 。根据动量定理的时刻,一个僵硬二身体的动态模型被导出,它能被用来决定系统的惯性的张肌。Modulating 卫星是在 quasi-Euler 角度的现在、需要的四元数结果并且使这些结果的参数正常化能保证相应于每个 quasi-Euler 角度的隧道在控制转矩的每个部件的费用。基于规范的 quasi-Euler 角度,一条切换的态度控制法律被建议。与控制法律,相应阶段轨道将沿着切换的表面滑动到起源(相应于需要的状态) 。模拟结果证明卫星能被推进器与建议控制法律完美地控制,甚至在结构的不对称现象并且在控制隧道之间的严肃的联合的情况中。 | JING Wuxing XIA Xiwang GAO Changsheng WEI Wenshu | 2011 | Chinese Journal of Aeronautics2011，24，3： | 10 |
| 5 | Development and Analysis of an Electrically Actuated Lower Extremity Assistive Exoskeleton显示文摘一架电子上激活的更低的极限皮骨骼被开发,在哪个当有弹性的元素连接的另外的关节消极地被激活时,仅仅膝关节活跃地被激活。这份报纸描述批评设计标准并且介绍设计的进程和使活动系统的计算。一台灵活物理 Human-Robot-Interaction (pHRI ) 测量设备被设计并且适用检测人的运动,它包括纳入连接手铐的内部表面的二个力量传感器和二个气囊。联机适应 pHRI 最小化控制策略被建议并且实现了驱使机器的皮骨骼系统跟随人的手足的运动轨道。测量 pHRI 信息被变化加权的一般水准(VWA ) 方法熔化。pHRI 和控制转矩的吝啬的方形的价值(MSV ) 被利用评估皮骨骼的表演。改进舒适水平和还原剂精力消费,当控制法律被设计时,严肃赔偿被考虑。最后,实际实验在健康用户上被执行。试验性的结果证明建议系统能帮助人走,构画出的控制策略有效、有效。 | Yi Long Zhijiang Du Chaofeng Chen Weidong Wang Long He Xiwang Mao Guoqiang Xu Guangyu Zhao Xiaoqi Li Wei Dong | 2017 | Journal of Bionic Engineering2017，14，2： | 7 |
| 6 | Three-dimensional cooperative guidance strategy and guidance law for intercepting highly maneuvering target显示文摘Cooperative interception of the target with strong maneuverability by multiple missiles with weak maneuverability in the three-dimensional nonlinear model is studied.Firstly,the three-dimensional nonlinear model of cooperative guidance is established.The three-dimensional reachable region is represented composed of lateral acceleration and longitudinal acceleration in the two-dimensional coordinate system.Secondly,the problem of the multiple missile’s reachable coverage area is transformed into the problem of cooperative coverage.A cooperative coverage strategy is proposed and an algorithm for quickly calculating the number of required missiles is designed.Then,the guidance law based on the cooperative coverage strategy is proposed,and it is proved that cooperative interception of the target can be achieved under the acceleration limit.Moreover,the relations among the number of missiles,the initial array position of terminal guidance and the coverage area of the target’s large maneuver are analyzed.The dynamic adjustment strategy of guidance parameters is proposed to reduce the guidance error.Finally,simulation results show that multiple missiles with low maneuverability can achieve effective interception of target with strong maneuverability through the proposed cooperative strategy and cooperative guidance method. | Ziyan CHEN Jianglong YU Xiwang DONG Zhang REN | 2021 | Chinese Journal of Aeronautics2021，34，5： | 7 |
| 7 | Formation tracking control for time-delayed multi-agent systems with second-order dynamics显示文摘In this paper, formation tracking control problems for second-order multi-agent systems(MASs) with time-varying delays are studied, specifically those where the position and velocity of followers are designed to form a time-varying formation while tracking those of the leader. A neighboring relative state information based formation tracking protocol with an unknown gain matrix and time-varying delays is presented. The formation tracking problems are then transformed into asymptotically stable problems. Based on the Lyapunov-Krasovskii functional approach, conditions sufficient for second-order MASs with time-varying delays to realize formation tracking are examined. An approach to obtain the unknown gain matrix is given and, since neighboring relative velocity information is difficult to measure in practical applications, a formation tracking protocol with time-varying delays using only neighboring relative position information is introduced. The proposed results can be used on target enclosing problems for MASs with second-order dynamics and time-varying delays. An application for target enclosing by multiple unmanned aerial vehicles(UAVs) is given to demonstrate the feasibility of theoretical results. | Han Liang Dong Xiwang Li Qingdong Ren Zhang | 2017 | Chinese Journal of Aeronautics2017，30，1： | 6 |
| 8 | Production and contribution of hydroxyl radicals between the DSA anode and water interface显示文摘Hydroxyl radicals play the key role during electrochemical oxidation and photoelectrochemical oxidation. The production and effect of hydroxyl radicals on the interface between DSA anode and water was investigated by examining the quenching effect of iso-propanol on Orange II decolorization. We observed that with an increase in electrode potential from 4 to 12 V across electrodes at pH 7.0, the contribution percentage of hydroxyl radicals increased dramatically. More OH radicals were produced in acidic and alkaline conditions than at neutral conditions. At electrode potential of 4 V, the contribution percentage of hydroxyl radicals was obviously higher at near neutral pH conditions, while removal efficiency of Orange II achieved was the lowest concurrently. Finally, for photocatalytic oxidation, electrochemical oxidation, and photoelectrochemical oxidation using the same DSA electrode, the effect of hydroxyl radicals proved to be dominant in photocatalytic oxidation but the contribution of hydroxyl radicals was not dominant in electrochemical oxidation, which implies the necessity of UV irradiation for electrochemical oxidation during water treatment. | Guoting Li Meiya Zhu Jing Chen Yunxia Li Xiwang Zhang | 2011 | Journal of Environmental Sciences2011，23，5： | 6 |
| 9 | Cooperative differential games guidance laws for multiple attackers against an active defense target显示文摘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. | Fei LIU Xiwang DONG Qingdong LI Zhang REN | 2022 | Chinese Journal of Aeronautics2022，35，5： | 5 |
| 10 | Clinical observations of osteoporotic vertebral compression fractures by using mineralized collagen modified polymethylmethacrylate bone cement显示文摘To investigate the clinical outcomes of the treatment of osteoporotic vertebral compression fractures(OVCFs)by using mineralized collagen(MC)modified polymethylmethacrylate(PMMA)bone cement.52 cases(52 vertebras)who sustained OVCF treated with MC modified PMMA bone cement from July 2014 to December 2015 were reviewed retrospectively.All the cases(52 patients,52 vertebras)included 8 males and 44 females with an average age of 74.83(ranging from 57-to 90-years old).The visual analogue scale(VAS),vertebral body height,Cobb angle,CT values preand post-operation as well as incidence of complications were used to be observed.All the patients underwent the surgery were successfully followed-up with an average period of 13.54 months(ranging from 6 to 23 months).The patients can ambulate at the second day after the operation.The VAS scores 2 days after the operation and during the last follow-up were significantly decreased compared with that before the operation(P<0.05);the average vertebral height and local Cobb angle had significant recovery(P<0.05);the CT value of the treated vertebra significantly increased compared with that before the operation(P<0.05).MC with good osteogenic activity and degradation properties can effectively improve the mechanical properties and biocompatibility of the PMMA bone cement,thus obtain better clinical results. | XiWang Jian-Ming Kou Yang Yue An-Ze Shao Xue-Jun Jia Jian-Wen Hou Chong Gao Zhi-Ye Qiu Xiu-Mei Wang Xi-Sheng Weng | 2017 | Regenerative Biomaterials2017，4，2： | 5 |
| 11 | Incidence and prevalence of moyamoya disease in urban China: a nationwide retrospective cohort study显示文摘Background and objective Moyamoya disease(MMD)is an increasingly recognised cause of stroke,mainly described in East Asia.China is the largest nation in Asia,but few studies reported the epidemiology of MMD,especially at a national level.We aimed to estimate the incidence and prevalence of MMD in China.Methods We performed a population-based study using data from the national databases of Urban Basic Medical Insurance between 2013 and 2016,covering approximately 0.50 billion individuals.MMD cases were identified by diagnostic code(International Classification of Diseases,10th Revision I67.5)or related diagnostic text.Results A total of 1987 MMD patients(mean age 44.45±14.30 years,female-to male ratio 1.12)were identified,representing a national crude incidence of 0.59(95%CI:0.49 to 0.68)and a prevalence of 1.01(95%CI:0.81 to 1.21)per 100000 person-years in 2016.Rates were higher in females than in males for the incidence(0.66 vs 0.52)and prevalence(1.05 vs 0.90).And the age-specific rates showed a bimodal distribution,with the highest peak in middle-aged group and the second peak in child group.Conclusions Our results confirm that MMD is relatively common in East Asians,but the rates in China were lower than those in other East Asian countries such as Japan and Korea.The unique epidemiological features,including a relatively weak female predominance and a shift in the highest peak of incidence from children to adults,revealed new sight into MMD.Further research is expected to explore the potential pathogenesis of MMD. | Yixin Sun Guoyu Zhou Jingnan Feng Lu Chen Guozhen Liu Jinxi Wang Qingliang Wang Junyou Yu Xiwang Yang Zheng Yang Pei Gao Shengfeng Wang Siyan Zhan | 2021 | Stroke & Vascular Neurology2021，6，4： | 4 |
| 12 | MU-GAN:Facial Attribute Editing Based on Multi-Attention Mechanism显示文摘Facial attribute editing has mainly two objectives:1)translating image from a source domain to a target one,and 2)only changing the facial regions related to a target attribute and preserving the attribute-excluding details.In this work,we propose a multi-attention U-Net-based generative adversarial network(MU-GAN).First,we replace a classic convolutional encoder-decoder with a symmetric U-Net-like structure in a generator,and then apply an additive attention mechanism to build attention-based U-Net connections for adaptively transferring encoder representations to complement a decoder with attribute-excluding detail and enhance attribute editing ability.Second,a self-attention(SA)mechanism is incorporated into convolutional layers for modeling long-range and multi-level dependencies across image regions.Experimental results indicate that our method is capable of balancing attribute editing ability and details preservation ability,and can decouple the correlation among attributes.It outperforms the state-of-the-art methods in terms of attribute manipulation accuracy and image quality.Our code is available at http://gffzz188fe103f8f1460aspxxwo60ux9wu6qq9.ffgz.tsg.suse.edu.cn/SuSir1996/MU-GAN. | Ke Zhang Yukun Su Xiwang Guo Liang Qi Zhenbing Zhao | 2021 | IEEE/CAA Journal of Automatica Sinica2021，8，9： | 4 |
| 13 | Numerical study of gas-solid two-phase flow and erosion in a cavity with a slope显示文摘Gate valve is mainly used to turn on or turn off the pipeline in pneumatic conveying.When the gate valve is fully open,the particles are easy to collide with the cavity rear wall and enter into the cavity,resulting in particles’accumulation in the cavity.The particles in cavity will accumulate between the cavity bottom and the flashboard bottom wall and prevent the gate from turning off normally.Meanwhile,the particles’collision with cavity rear wall will cause serious erosion.Both the particles’accumulation and erosion will cause the poor sealing of the gate valve,further resulting in the leakage of the pipeline system.To reduce the particles’accumulation in cavity and erosion on cavity when the gate valve is fully open,we simplify the gate valve into a cavity structure and study it.We find that adding a slope upstream the cavity can effectively reduce the particles’accumulation in the cavity and the erosion on the cavity rear wall.In this work,Eulerian-Lagrangian method in commercial code(FLUENT)was used to study the gas-solid two-phase flow and erosion characteristics of a cavity with a slope.The particle distribution shows that the particles with Stokes number St=1.3 and St=13 cannot enter the cavity due to the slope,but the particles with St=0.13 enter the cavity following the gas.For St=13,the particles collide with the wall many times in the ideal cavity.Erosion results show that the slope can transfer the erosion on cavity rear wall to the slope and reduce the maximum erosion rate of the wall near the cavity to some degrees. | Zhe Lin Xiwang Sun Yi Li Zuchao Zhu | 2022 | Particuology2022，20，3： | 3 |
| 14 | Histological and cytological investigations of the infection and colonization of apple bark by Valsa mali var. mali显示文摘 | Xiwang Ke Lili Huang Qingmei Han Xiaoning Gao Zhengsheng Kang | 2013 | Australasian Plant Pathology2013，，1： | 3 |
| 15 | UIF-based cooperative tracking method for multi-agent systems with sensor faults显示文摘For maneuvering target tracking with sensor faults, consensus-based distributed state estimation problems are studied herein. The communication status of the nonlinear system composed of multiple agents is described using the graph theory. Considering the impacts caused by sensor failures on measurement equations, a weighted average consensus-based unscented information filter(UIF) algorithm is proposed to improve tracking accuracy. Moreover, the estimation error for the investigated nonlinear system has been analyzed based on the stochastic boundedness theory to evaluate the proposed algorithm's performance and feasibility. Finally, simulation results are presented to assert the validity of the method. | Yingrong YU Siting PENG Xiwang DONG Qingdong LI Zhang REN | 2019 | Science China(Information Sciences)2019，62，1： | 3 |
| 16 | Utilization of aluminum hydroxide waste generated in fluoride adsorption and coagulation processes for adsorptive removal of cadmium ion显示文摘尽管基于 Al 的凝结和吸附过程为氟化物(F) 移动被证明高度有效,二个过程两个都产生大量艾尔(哦)3 固体废物包含 F (艾尔(哦)3-F) 。这研究试图调查利用艾尔的可行性(哦) 在艾尔产生的 3-F (哦)3 吸附(艾尔(哦)3-F 广告 ) 和凝结(艾尔(哦)3-F 为镉离子(Cd (II )) 的吸附的 coag ) 。艾尔的吸附能力(哦)3-F 广告 和艾尔(哦)3-F 为 Cd (II ) 的 coag 作为太古的铝氢氧化物的类似(艾尔(哦) 具有 24.39 和 19.90 mg 映慬Р的 3), | Jiawei JU Ruiping LIU Zan HE Huijuan LIU Xiwang ZHANG Jiuhui QU | 2016 | Frontiers of Environmental Science & Engineering2016，10，3： | 2 |
| 17 | A swept fin-induced flow field with different height mounting gaps显示文摘In order to apply the air fin successfully and ensure the maneuverability of hypersonic vehicle, a key problem to be studied urgently is the heat flux brought by the fin mounting gap.The appearance of mounting gap and fin shaft can induce many complex flow structures which need more attentions to be investigated. Under Ma 6, Nano-tracer-based Planar Laser Scattering(NPLS)and Temperature Sensitive Paints(TSP) were applied to visualize and measure transient flow structures and heat flux distribution of a swept fin-induced flow field with different height mounting gaps. Complementarily, Reynolds-averaged N-S equations were solved with k-x SST turbulent model. The heat flux distribution results of numerical simulation and TSP observed the change of high heat flux region with different mounting gap, both in position and magnitude. The streamlines based on Computational Fluid Dynamics(CFD) and flow visualization results obtained by NPLS revealed the cause of high heat flux region. The high heat flux region in this flow field is mainly related to the reattachment of vortex and flow stagnation. The increase of gap height can lead to stronger gap overflow and shaft-induced horseshoe vortex, which are source of the high heat flux around the fin. The case with the highest mounting gap(4 mm) en-counters the most severe aerodynamic heating, both on the surface of fin and plate. Thus, under the premise of ensuring the flexibility of the fin, the gap should be set as small as possible. | Feng ZHANG Shihe YI Xiwang XU Haibo NIU Xiaoge LU | 2021 | Chinese Journal of Aeronautics2021，34，1： | 2 |
| 18 | Chlorine-anion doping induced multi-factor optimization in perovskites for boosting intrinsic oxygen evolution显示文摘The oxygen evolution reaction(OER) plays a crucial role in many electrochemical energy technologies,and creating multiple beneficial factors for OER catalysis is desirable for achieving high catalytic efficiency.Here,we highlight a new halogen-chlorine(Cl)-anion doping strategy to boost the OER activity of perovskite oxides.As a proof-of-concept,proper Cl doping at the oxygen site of LaFeO3(LFO) perovskite can induce multiple favorable characteristics for catalyzing the OER,including rich oxygen vacancies,increased electrical conductivity and enhanced Fe-O covalency.Benefiting from these factors,the LaFeO2.9-δCl0.1(LFOCl) perovskite displays significant intrinsic activity enhancement by a factor of around three relative to its parent LFO.This work uncovers the effect of Cl-anion doping in perovskites on promoting OER performance and paves a new way to design highly efficient electrocatalysts. | Yinlong Zhu Qian Lin Zhenbin Wang Dongchen Qi Yichun Yin Yu Liu Xiwang Zhang Zongping Shao Huanting Wang | 2021 | Journal of Energy Chemistry2021，30，1： | 2 |
| 19 | TGF‐β1 Expression and Atrial Myocardium Fibrosis Increase in Atrial Fibrillation Secondary to Rheumatic Heart Disease显示文摘 | HuaXiao HanLei ShuQin KanghuaMa XiWang | 2010 | Clin Cardiol2010，，3： | 2 |
| 20 | Electro chemically assisted photocatalytic degradation of Acid Orange 7 with ,8- Pb02 electrodes modified by TiO2 显示文摘 | Guoting Li Jiuhui Qu Xiwang Zhang | 2006 | Water Research2006，40，： | 1 |
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