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| 1 | Improved differential geometric guidance commands for endoatmospheric interception of high-speed targets显示文摘Pure proportional navigation(PPN) is suitable for endoatmospheric interceptions,for its commanded acceleration is perpendicular to interceptor velocity.However,if the target is much faster than the interceptor,the homing performance of PPN will be degraded badly.True proportional navigation(TPN) does not have this problem,but its commanded acceleration is perpendicular to the line of sight(LOS),which is not suitable for endoatmospheric interceptions.The commanded acceleration of differential geometric guidance commands(DGGC) is perpendicular to the interceptor velocity,while the homing performance approximates the LOS referenced guidance laws(PPN series).Therefore,DGGC is suitable for endoatmospheric interception of high-speed targets.However,target maneuver information is essential for the construction of DGGC,and the guidance commands are complex and may be without robustness.Through the deep analysis of three-dimensional engagement,a new construction method of DGGC is proposed in this paper.The target maneuver information is not needed any more,and the robustness of DGGC is guaranteed,which makes the application of DGGC possible. | LI KeBo CHEN Lei TANG GuoJin | 2013 | Science China(Technological Sciences)2013，56，2： | 22 |
| 2 | Constrained Bézier curves' best multi-degree reduction in the L_2-norm显示文摘In computer aided geometric design, the degree reduction of the parameter curve is a key technique in data exchange and data compression. The various existing methods of degree reduction cannot decide whether the degree reduction curve satisfying the given tolerance exists beforehand, cannot give approximation of the best multi-degree reduction, or cannot provide explicit expression and error formula of the degree reduction curve. In this paper, we propose an entirely new method, which can hurdle the above flaws completely. For a given Bézier curve of degree n, we can easily decide whether a Bézier reduction curve of degree m exists, which has equal derivatives with the given curve up to (r-1)-th and (s-1)-th orders (r,s≤m) respectively at the endpoints, so the approximating error is less than the given tolerance ε in the L2-norm. If the curve exists, the explicit expression can be given. | ZHANG Renjiang WANG Guojin | 2005 | Progress in Natural Science:Materials International2005，15，9： | 20 |
| 3 | Research on the strategy of angles-only relative navigation for autonomous rendezvous显示文摘This paper considers the problem of angles-only relative navigation for autonomous rendezvous. Methods for determining degree of observability (DOO) and latent range information of orbital maneuver are proposed for analyzing and enhancing the precision of relative position and velocity estimation. The equations of angles-only relative navigation are set forth on the condition that optical camera is the only viable sensor for relative measurement, and expressions for the DOO of relative navigation are obtained by using the Newton iterative method. The latent range information of orbital maneuver is analyzed, which is employed to enhance the DOO of angles-only relative navigation. Simulation result shows that DOO is effective to describe the observability level of relative position and velocity, and the latent range information is useful in enhancing the DOO of the angles-only relative navigation. | LI JiuRen LI HaiYang TANG GuoJin LUO YaZhong | 2011 | Science China(Technological Sciences)2011，54，7： | 13 |
| 4 | Survey of orbital dynamics and control of space rendezvous显示文摘Rendezvous orbital dynamics and control(RODC) is a key technology for operating space rendezvous and docking missions. This paper surveys the studies on RODC. Firstly,the basic relative dynamics equation set is introduced and its improved versions are evaluated. Secondly,studies on rendezvous trajectory optimization are commented from three aspects: the linear rendezvous,the nonlinear two-body rendezvous,and the perturbed and constrained rendezvous. Thirdly,studies on relative navigation are briefly reviewed,and then close-range control methods including automated control,manual control,and telecontrol are analyzed. Fourthly,advances in rendezvous trajectory safety and robust analysis are surveyed,and their applications in trajectory optimization are discussed. Finally,conclusions are drawn and prospects of studies on RODC are presented. | Luo Yazhong Zhang Jin Tang Guojin | 2014 | Chinese Journal of Aeronautics2014，27，1： | 13 |
| 5 | Algebraic solution of differential geometric guidance command and time delay control显示文摘According to the three-dimensional geometry of the engagement,the explicit algebraic expression of differential geometric guidance command(DGGC)is proposed.Compared with the existing solutions,the algebraic solution is much simpler and better for the further research of the characteristics of DGGC.Time delay control(TDC)is a useful method to tackle the uncertainty problem of a control system.Based on TDC,taking the target maneuvering acceleration as a disturbance,the estimation algorithm of the target maneuvering acceleration is presented,which can be introduced in DGGC to improve its performance.Then,the augmented DGGC(ADGGC)is obtained.The numerical simulation of intercepting a high maneuvering target is conducted to demonstrate the effectiveness of ADGGC. | LI KeBo CHEN Lei TANG GuoJin | 2015 | Science China(Technological Sciences)2015，58，3： | 13 |
| 6 | A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes显示文摘Thermal runaway has been a long-standing safety issue impeding the development of high-energydensity batteries. Physical safety designs such as employing circuit-breakers and fuses to batteries are limited by small operating voltage windows and no resumption of original working condition when it is cooled down. Here we report a smart thermoresponsive polymer electrolyte that can be incorporated inside batteries to prevent thermal runaway via a fast and reversible sol-gel transition, and successfully combine this smart electrolyte with a rechargeable Zn/a-MnO_2 battery system. At high temperature, battery operation is inhibited as a result of the increased internal resistance caused by the gelation of liquid electrolyte. After cooling down, the electrolyte is spontaneously reversed to sol state and the electrochemical performance of the battery is restored. More importantly, sol-gel transition enables the smart battery to experience different charge-discharge rates under various temperature levels, providing a smart and active strategy to achieve dynamic and reversible self-protection. | Funian Mo Hongfei Li Zengxia Pei Guojin Liang Longtao Ma Qi Yang Donghong Wang Yan Huang Chunyi Zhi | 2018 | Science Bulletin2018，63，16： | 13 |
| 7 | Big Earth Data science:an information framework for a sustainable planet显示文摘The digital transformation of our society coupled with the increasing exploitation of natural resources makes sustainability challenges more complex and dynamic than ever before.These changes will unlikely stop or even decelerate in the near future.There is an urgent need for a new scientific approach and an advanced form of evidence-based decisionmaking towards the benefit of society,the economy,and the environment.To understand the impacts and interrelationships between humans as a society and natural Earth system processes,we propose a new engineering discipline,Big Earth Data science.This science is called to provide the methodologies and tools to generate knowledge from diverse,numerous,and complex data sources necessary to ensure a sustainable human society essential for the preservation of planet Earth.Big Earth Data science aims at utilizing data from Earth observation and social sensing and develop theories for understanding the mechanisms of how such a social-physical system operates and evolves.The manuscript introduces the universe of discourse characterizing this new science,its foundational paradigms and methodologies,and a possible technological framework to be implemented by applying an ecosystem approach.CASEarth and GEOSS are presented as examples of international implementation attempts.Conclusions discuss important challenges and collaboration opportunities. | Huadong Guo Stefano Nativi Dong Liang Max Craglia Lizhe Wang Sven Schade Christina Corban Guojin He Martino Pesaresi Jianhui Li Zeeshan Shirazi Jie Liu Alessandro Annoni | 2020 | International Journal of Digital Earth2020，13，7： | 12 |
| 8 | Stability analysis of the temperature cracks in Xiaowan arch dam显示文摘In the Xiaowan arch dam there are massive temperature cracks nearly parallel to the dam axis. Obviously, whether the cracks may spread or not during the water storage process is one of the crucial factors for the safety of a dam. In this paper, a new type of crack element, in which the contact component is implicitly included into the concrete component, is proposed to simulate the effects of the existing cracks. The crack element is proved by numerical example to share the merits of both conventional contact elements and joint elements. With a finite element model of the cracked arch dam together with its rock foundation established, the transient displacement and stress fields of the dam are obtained. The complicated rock foundation, the construction process of the arch dam, the massive cracks, the transient temperature field, as well as the water storage process have been taken into consideration in the simulation. In addition to the global model, several sub-models for typical crack tips are also generated with finer elements placed around the tips. Thus, more accurate displacement and stress distribution are obtained by simultaneous sub-model simulation. Based on the calculation of stress intensity factor for crack tips by extension method, the temperature cracks in the Xiaowan arch dam are finally proved to be stable. | WANG WeiMing DING JianXin WANG GuoJin ZOU LiChun CHEN ShengHong | 2011 | Science China(Technological Sciences)2011，54，3： | 12 |
| 9 | Evaluation of cracking potential for concrete arch dam based on simulation feedback analysis显示文摘It is still very difficult for researchers and engineers to implement the simulation analysis including a complete process and a full model with the complicated arch dam and the foundation, and to evaluate the cracking potential in the construction and service periods. To take Xiaowan project of China for an example, a practical system of simulation feedback analysis, a specific cracking criterion, and a resolution for the conflicting requirements of temperature and stress/strain simulation are presented, which are put into a successful practice. The simulation results of temperature, stress, and cracking are identical well with the monitor data. A modified temperature control measure is propounded, and the significant effect is gained by adopting the new scheme. | FU ShaoJun HE Ting WANG GuoJin ZHANG ShiHu ZOU LiChun CHEN ShengHong | 2011 | Science China(Technological Sciences)2011，54，3： | 10 |
| 10 | Approximate merging of multiple Bézier segments显示文摘This paper deals with the approximate merging problem of multiple adjacent Bézier curves with dierent degrees by a single Bézier curve,which is a frequently seen problem in modeling.The unified matrix representation for precise merging is presented and the approx-imate merging curve is further derived based on matrix operation.Continuity at the endpoints of curves is also discussed in the merging process.Examples show that the method in this paper achieves satisfying merging results. | Min Cheng Guojin Wang | 2008 | Progress in Natural Science:Materials International2008，18，6： | 10 |
| 11 | Motion Planning for Vibration Reducing of Free-floating Redundant Manipulators Based on Hybrid Optimization Approach显示文摘这份报纸涉及最佳的运动为颤动减少免费漂浮的灵活冗余的操纵者计划。第一,系统的动态模型基于 Lagrange 方法被建立,并且为颤动减少计划模型的运动被建议。第二,采用高斯 pseudospectral 方法(GPM ) 的一条混合优化途径和直接射击方法(DSM ) ,被建议解决计划的运动问题。在这条途径,计划问题的运动用 GPM 被转变成一个非线性的参数优化问题,并且基因算法(GA ) 被采用定位近似解决方案。随后,一个优化模型基于 DSM 被提出,并且顺序的二次的编程(SQP ) 算法被用来获得精确解决方案,与象一个起始的引用解决方案的近似解决方案。最后,几数字模拟被调查,并且灵活连接的全球颤动或剩余颤动被被混合优化途径获得的联合轨道显然减少。数字模拟结果显示途径对计划颤动减少的问题的运动有效、稳定。 | LIAO Yihuan LI Daokui TANG Guojin | 2011 | Chinese Journal of Aeronautics2011，24，4： | 8 |
| 12 | Generation of ready to use (RTU) products over China based on Landsat series data显示文摘Earth observation community has entered into the era of big data.Family of Landsat sensors have collected massive medium resolution satellite images,which are valuable for long-term land surface monitoring.In order to significantly reduce the magnitude of data processing for remote sensing data users,Landsat-based Ready to Use(RTU)products have been produced.Main RTU products,including orthorectified products,land surface reflectance,land surface temperature,large-area mosaic image,and standard image map products,are described.The resulting Landsat RTU products are hosted on the RSGS earth observation data sharing web site for free download(http://gffzz959b1a8e74bf485dhnkwvn0vobcnk6u66.ffgz.tsg.suse.edu.cn/rtu/).These new products will provide consistent,standardized,multi-decadal image data for robust land cover change detection and monitoring across the Earth sciences.In the coming years,CASEarth DataBank system will be constructed,which is an intelligent data service platform for providing not only the RTU products from multi-source satellite data,but also big earth data analysis methods. | Guojin He Zhaoming Zhang Weili Jiao Tengfei Long Yan Peng Guizhou Wang Ranyu Yin Wei Wang Xiaomei Zhang Huichan Liu Bo Cheng Bo Xiang | 2018 | Big Earth Data2018，2，1： | 8 |
| 13 | A new method for designing a developable surface utilizing the surface pencil through a given curve显示文摘This paper proposes a new method for designing a developable surface by constructing a surface pencil passing through a given curve, which is quite in accord with the practice in industry design and manufacture.By utilizing the Frenet trihedron frame,we derive the necessary and suffcient conditions to construct a developable surface through a given curve.Considering the requirements in shoemak- ing and garment-manufacture industries,we also study the special case of specifying the given curve as a geodesic.The given geodesic can be classified into three types corresponding to each type of developable surface.We also present the polynomial representation of the developable surface.The algorithm is convenient and effcient for applications in engineering. | Hongyan Zhao Guojin Wang | 2008 | Progress in Natural Science:Materials International2008，18，1： | 8 |
| 14 | Hybrid planning for LEO long-duration multi-spacecraft rendezvous mission显示文摘For the low-earth-orbit(LEO) long-duration multi-spacecraft rendezvous mission,a mixed integer nonlinear programming(MINLP) model is built with consideration of the J2 perturbation and the time window constraints based on lighting condition.A two-level hybrid optimization approach is proposed.The up-level problem uses the visiting sequence,the orbital transfer duration and the service time after each rendezvous as design variables,and employs the mix-coded genetic algorithm to search the optimal solution;the low-level problem uses the maneuver time and impulses in each rendezvous as design vari-ables,and employs the downhill simplex method to search the optimal solution.To improve the solving efficiency of the low-level problem,a linear dynamic model with J2 perturbation is derived,and the approximate strategy of the low-level prob-lem is then proposed.The proposed method has been applied to several numerical problems.The results lead to three major conclusions:(1) The MINLP model for LEO long-duration multi-spacecraft rendezvous mission is effective,and the proposed hybrid optimization strategy can obtain good solutions that satisfy time window constraints;(2) The derived linear dynamic equations are good first-order approximation to the long-duration rendezvous trajectory under J2 perturbation;(3) Under J2 perturbation,the long-duration rendezvous problem has multiple local minimums either in the duration of multiple orbits or in a single orbit,and it agrees with the problem's characteristic to use the mix-coded genetic algorithm. | ZHANG Jin LUO YaZhong TANG GuoJin | 2012 | Science China(Technological Sciences)2012，55，1： | 8 |
| 15 | Carbon-Based Flexible and All-Solid-State Micro-supercapacitors Fabricated by Inkjet Printing with Enhanced Performance显示文摘By means of inkjet printing technique, flexible and all-solid-state micro-supercapacitors(MSCs) were fabricated with carbon-based hybrid ink composed of graphene oxide(GO,98.0vol.%) ink and commercial pen ink(2.0vol.%). A small amount of commercial pen ink was added to effectively reduce the agglomeration of theGO sheets during solvent evaporation and the following reduction processes in which the presence of graphite carbon nanoparticles served as nano-spacer to separate GO sheets. The printed device fabricated using the hybrid ink,combined with the binder-free microelectrodes and interdigital microelectrode configuration, exhibits nearly 780%enhancement in areal capacitance compared with that of pure GO ink. It also shows excellent flexibility and cycling stability with nearly 100% retention of the areal capacitance after 10,000 cycles. The all-solid-state device can be optionally connected in series or in parallel to meet the voltage and capacity requirements for a given application.This work demonstrates a promising future of the carbonbased hybrid ink for directly large-scale inkjet printing MSCs for disposable energy storage devices. | Zhibin Pei Haibo Hu Guojin Liang Changhui Ye | 2017 | Nano-Micro Letters2017，9，2： | 7 |
| 16 | Optimal multi-objective trajectory design based on close-looped control for autonomous rendezvous显示文摘This paper considers the problem of optimal multi-objective trajectory design for autonomous rendezvous.Total velocity cost and relative state robustness of close-looped control are selected as the objective functions.Based on relative dynamics equations,the state equations and measurement equations for angles-only relative navigation between spacecrafts are set forth.According to the method of linear covariance analysis,the close-looped control covariance of the true relative state from the reference relative state is analyzed,and the objective functions of relative state robustness are formulated.Considering the total velocity cost and the relative state robustness,the multi-objective optimization algorithm of NSGA-II is employed to solve this multi-impulsive rendezvous problem.Lastly,the validity of the objective functions and the covariance results are demonstrated through 100 times Monte Carlo simulation. | LI JiuRen LI HaiYang TANG GuoJin | 2011 | Science China(Technological Sciences)2011，54，11： | 6 |
| 17 | A new approach for teleoperation rendezvous and docking with time delay显示文摘Teleoperation rendezvous and docking can be used as a backup for autonomous rendezvous and docking (RVD) for an unmanned spacecraft or for guiding the chaser docking with an uncooperative target.The inherent teleoperation time delay is a rigorous problem,especially when the chaser is teleoperated on the ground.To eliminate the effect of time delay,a new approach for teleoperation RVD is studied.The characteristics of teleoperation RVD are analyzed by comparisons with the teleoperation robot and with manually controlled RVD;the relative motion of the chaser is predicted based on the C-W equation;and the processed measure information with time delay through the Kalman filter is utilized to correct the current prediction.Experimental results verify that the approach produces an 18% enhanced success rate of teleoperation RVD compared with direct visual feedback,and consumes less time and fuel.The developed approach also solves the time delay problem effectively.Teleoperation RVD using this method can be applied as a useful backup for autonomous RVD. | ZHOU JianYong JIANG ZiCheng TANG GuoJin | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，2： | 6 |
| 18 | Planning for space station long-duration orbital mission under multi-constraints显示文摘An integrated nonlinear planning(NLP) model is built for space station long-duration orbital missions considering both the vehicle visiting schedules and the interaction effects between target phasing,vehicle return adjusting and Earth observation aiming.A two-level optimization approach is proposed to solve this complicated problem.The up-level problem employs the launch times of visiting vehicles as design variables,considers the constraints of crew rotations,resource resupplies and rendezvous launch windows,and is solved by a genetic algorithm.The low-level problems employ the maneuver impulses and burn times within each orbital mission as design variables,and a high-efficient shooting iteration method is proposed based on an analytical equation for the phase angle correction considering the J 2 perturbation.The results indicate that the integrated NLP model for space station long-duration orbital missions is effective,and the proposed optimization approach can obtain the optimal solutions that satisfy the multiple constraints and reduce the total propellant consumption. | LIN KunPeng LUO YaZhong ZHANG Jin TANG GuoJin | 2013 | Science China(Technological Sciences)2013，56，5： | 5 |
| 19 | CitGVD:a comprehensive database of citrus genomic variations显示文摘Citrus is one of the most important commercial fruit crops worldwide.With the vast genomic data currently available for citrus fruit,genetic relationships,and molecular markers can be assessed for the development of molecular breeding and genomic selection strategies.In this study,to permit the ease of access to these data,a web-based database,the citrus genomic variation database(CitGVD,http://gffzz1758061741e3440chnkwvn0vobcnk6u66.ffgz.tsg.suse.edu.cn/home)was developed as the first citrusspecific comprehensive database dedicated to genome-wide variations including single nucleotide polymorphisms(SNPs)and insertions/deletions(INDELs).The current version(V1.0.0)of CitGVD is an open-access resource centered on 1,493,258,964 high-quality genomic variations and 84 phenotypes of 346 organisms curated from in-house projects and public resources.CitGVD integrates closely related information on genomic variation annotations,related gene annotations,and details regarding the organisms,incorporating a variety of built-in tools for data accession and analysis.As an example,CitGWAS can be used for genome-wide association studies(GWASs)with SNPs and phenotypic data,while CitEVOL can be used for genetic structure analysis.These features make CitGVD a comprehensive web portal and bioinformatics platform for citrus-related studies.It also provides a model for analyzing genome-wide variations for a wide range of crop varieties. | Qiang Li Jingjing Qi Xiujuan Qin Wanfu Dou Tiangang Lei Anhua Hu Ruirui Jia Guojin Jiang Xiuping Zou Qin Long Lanzhen Xu Aihong Peng Lixiao Yao Shanchun Chen Yongrui He | 2020 | Horticulture Research2020，7，1： | 4 |
| 20 | Multiple products of B-splines used in CAD system显示文摘计算机的函数升级帮助了请求的设计( CAD )系统B花键的多重产品工作,这应该作为一些的线性联合被代表合适(通常高度) B-splines.In 这篇论文,我们使用花键空格和分离B花键的理论推出线性联合的所有术语的系数的表示,它能直接被用于软件在系统开发编码。 | XU Huixia WANG Guojin | 2006 | Progress in Natural Science:Materials International2006，16，4： | 4 |
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