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| 1 | Performance of 3D TPN against true-arbitrarily maneuvering target for exoatmospheric interception显示文摘True proportional navigation(TPN) guidance law is widely used for exoatmospheric interception, for its robustness and ease of implementation. The performance of TPN against nonmaneuvering target or the maneuvering target with a specific acceleration had been analyzed before. However, the obtained results are not suitable for the realistic exoatmospheric interception scenario,since the target may maneuver along an arbitrary direction with an arbitrary but upper-bounded acceleration in the threedimensional(3 D) space, which is the so-called 'true-arbitrarily maneuvering target' in this paper. With the help of the line-ofsight(LOS) rotation coordinate system, the performance of 3 D TPN against the true-arbitrarily maneuvering target is thoroughly analyzed using the Lyapunov-like approach. The upper-bound of the 3 D LOS rate is obtained, and so is that of the commanded acceleration of 3 D TPN. After that, the capture region of 3 D TPN is presented on the initial relative velocity plane. The nonlinear3 D relative kinematics between the interceptor and the target is taken into full account. Finally, the new theoretical findings are demonstrated by numerical simulations. | LI KeBo LIANG YanGang SU WenShan CHEN Lei | 2018 | Science China(Technological Sciences)2018，61，8： | 9 |
| 2 | Reachable set modeling and engagement analysis of exoatmospheric interceptor显示文摘A novel reachable set(RS) model is developed within a framework of exoatmospheric interceptor engagement analysis. The boost phase steering scheme and trajectory distortion mechanism of the interceptor are firstly explored. A mathematical model of the distorted RS is then formulated through a dimension–reduction analysis. By treating the outer boundary of the RS on sphere surface as a spherical convex hull, two relevant theorems are proposed and the RS envelope is depicted by the computational geometry theory. Based on RS model, the algorithms of intercept window analysis and launch parameters determination are proposed, and numerical simulations are carried out for interceptors with different energy or launch points. Results show that the proposed method can avoid intensive on-line computation and provide an accurate and effective approach for interceptor engagement analysis. The suggested RS model also serves as a ready reference to other related problems such as interceptor effectiveness evaluation and platform disposition. | Chai Hua Liang Yangang Chen Lei Tang Guojin | 2014 | Chinese Journal of Aeronautics2014，27，6： | 1 |
| 3 | Hydrothermal Synthesis and Phase-, Morphology-Evolution Mechanism of Lead Titanate Nanostructures Assisted with Tetramethylammonium Hydroxide显示文摘 | Liang Bao Junhao He Gang Xu Yangang Zhao Xin Yang Ge Shen Gaorong Han | 2017 | Chinese Journal of Chemistry2017，35，7： | 0 |
| 4 | New Result on Interception of Stationary Targets at Arbitrary Time-Varying Speed显示文摘This paper develops a novel approach and some main results on the varying-speed missile guided by pure proportional navigation(PPN)against a stationary target in the planar interception problem.The missile kinematic equation is established in the arc-length domain based on the differential geometry theory,which eliminates the influence of time-varying missile speed.Then,the closed-form solutions of line-of-sight(LOS)rate,leading angle,closing speed,and curvature command are derived in the arc-length domain.The performance of the varyingspeed missile is analyzed,including the maximum relative distance,maximum curvature command,accurate path-to-go,and curvature increment.Additionally,the capture region is obtained considering the missile maneuvering acceleration limit.These new theoretical results could be extended to improve the performance of existing guidance laws designed under the constant-speed assumption. | Yuanhe Liu Kebo Li Yangang Liang Jin Tang | 2022 | Guidance, Navigation and Control2022，2，4： | 0 |
| 5 | Neural hand reconstruction using an RGB image显示文摘Background This study presents a neural hand reconstruction method for monocular 3D hand pose and shape estimation.Methods Alternate to directly representing hand with 3D data,a novel UV position map is used to represent a hand pose and shape with 2D data that maps 3D hand surface points to 2D image space.Furthermore,an encoder-decoder neural network is proposed to infer such UV position map from a single image.To train this network with inadequate ground truth training pairs,we propose a novel MANOReg module that employs MANO model as a prior shape to constrain high dimensional space of the UV position map.Results The quantitative and qualitative experiments demonstrate the effectiveness of our UV position map representation and MANOReg module. | Mengcheng LI Liang AN Tao YU Yangang WANG Feng CHEN Yebin LIU | 2020 | Virtual Reality & Intelligent Hardware2020，2，3： | 0 |
| 6 | Crosslinked Polyethyleneimine Gel Polymer Interface to Improve Cycling Stability of RFBs显示文摘Redox flow batteries are considered a promising technology for grid energy storage.However,capacity decay caused by crossover of active materials is a universal challenge for many flow battery systems,which are based on various chemistries.In this paper,using the vanadium redox flow battery as an example,we demonstrate a new gel polymer interface(GPI)consisting of crosslinked polyethyleneimine with a large amount of amino and carboxylic acid groups introduced between the positive electrode and the membrane.The GPI functions as a key component to prevent vanadium ions from crossing the membrane,thus supporting stable long-term cycling.Cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)measurements were conducted to investigate the effect of GPI on the electrochemical properties of graphitic carbon electrodes(GCFs)and redox reaction of catholyte.X-ray photoelectron spectroscopy(XPS)and ^(1)H nuclear magnetic resonance(NMR)spectra demonstrated that the crosslinked GPI is chemically stable for 100 cycles without dissolution of polymers and swelling in the strong acidic electrolytes.Results from inductively coupled plasma mass spectrometry(ICP-MS),Fourier-transform infrared(FTIR)spectroscopy,and energy-dispersive X-ray(EDX)spectroscopy proved that the GPI is effective in maintaining the concentration of vanadium species in their respective half-cells,resulting in improved cycling stability because of it prevents active species from crossing the membrane and stabilizes the oxidation states of active species. | Hyung-Seok Lim Sujong Chae Litao Yan Guosheng Li Ruozhu Feng Yongsoon Shin Zimin Nie Bhuvaneswari Modachur Sivakumar Xin Zhang Yangang Liang David Jonathan Bazak Vaithiyalingam Shutthanandan Vijayakumar Murugesan Soowhan Kim Wei Wang | 2022 | Energy Material Advances2022，，1： | 0 |
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