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| 1 | Virtual target guidance-based distributed model predictive control for formation control of multiple UAVs显示文摘The paper proposes a Virtual Target Guidance(VTG)-based distributed Model Predictive Control(MPC) scheme for formation control of multiple Unmanned Aerial Vehicles(UAVs).First, a framework of distributed MPC scheme is designed in which each UAV only shares the information with its neighbors, and the obtained local Finite-Horizon Optimal Control Problem(FHOCP) can be solved by swarm intelligent optimization algorithm.Then, a VTG approach is developed and integrated into the distributed MPC scheme to achieve trajectory tracking and obstacle avoidance.Further, an event-triggered mechanism is proposed to reduce the computational burden for UAV formation control, which takes into consideration the predictive state errors as well as the convergence of cost function.Numerical simulations show that the proposed VTG-based distributed MPC scheme is more computationally efficient to achieve formation control of multiple UAVs in comparison with the traditional distributed MPC method. | Zhihao CAI Longhong WANG Jiang ZHAO Kun WU Yingxun WANG | 2020 | Chinese Journal of Aeronautics2020，33，3： | 20 |
| 2 | Feasibility study of a large-scale tuned mass damper with eddy current damping mechanism显示文摘Tuned mass dampers(TMDs) have been widely used in recent years to mitigate structural vibration.However,the damping mechanisms employed in the TMDs are mostly based on viscous dampers,which have several well-known disadvantages,such as oil leakage and difficult adjustment of damping ratio for an operating TMD.Alternatively,eddy current damping(ECD) that does not require any contact with the main structure is a potential solution.This paper discusses the design,analysis,manufacture and testing of a large-scale horizontal TMD based on ECD.First,the theoretical model of ECD is formulated,then one large-scale horizontal TMD using ECD is constructed,and finally performance tests of the TMD are conducted.The test results show that the proposed TMD has a very low intrinsic damping ratio,while the damping ratio due to ECD is the dominant damping source,which can be as large as 15% in a proper configuration.In addition,the damping ratios estimated with the theoretical model are roughly consistent with those identified from the test results,and the source of this error is investigated.Moreover,it is demonstrated that the damping ratio in the proposed TMD can be easily adjusted by varying the air gap between permanent magnets and conductive plates.In view of practical applications,possible improvements and feasibility considerations for the proposed TMD are then discussed.It is confirmed that the proposed TMD with ECD is reliable and feasible for use in structural vibration control. | Wang Zhihao Chen Zhengqing Wang Jianhui | 2012 | Earthquake Engineering and Engineering Vibration2012，11，3： | 19 |
| 3 | A Review on Metal-Organic Framework-Derived Porous Carbon-Based Novel Microwave Absorption Materials显示文摘The development of microwave absorption materials(MAMs) is a considerable important topic because our living space is crowed with electromagnetic wave which threatens human’s health.And MAMs are also used in radar stealth for protecting the weapons from being detected.Many nanomaterials were studied as MAMs,but not all of them have the satisfactory performance.Recently,metal-organic frameworks(MOFs) have attracted tremendous attention owing to their tunable chemical structures,diverse properties,large specific surface area and uniform pore distribution.MOF can transform to porous carbon(PC) which is decorated with metal species at appropriate pyrolysis temperature.However,the loss mechanism of pure MOF-derived PC is often relatively simple.In order to further improve the MA performance,the MOFs coupled with other loss materials are a widely studied method.In this review,we summarize the theories of MA,the progress of different MOF-derived PC-based MAMs,tunable chemical structures incorporated with dielectric loss or magnetic loss materials.The different MA performance and mechanisms are discussed in detail.Finally,the shortcomings,challenges and perspectives of MOF-derived PC-based MAMs are also presented.We hope this review could provide a new insight to design and fabricate MOF-derived PC-based MAMs with better fundamental understanding and practical application. | Zhiwei Zhang Zhihao Cai Ziyuan Wang Yaling Peng Lun Xia Suping Ma Zhanzhao Yin Yi Huang | 2021 | Nano-Micro Letters2021，13，4： | 17 |
| 4 | A physics-based statistical algorithm for retrieving land surface temperature from AMSR-E passive microwave data显示文摘AMSR-E and MODIS are two EOS (Earth Observing System) instruments on board the Aqua satellite. A regression analysis between the brightness of all AMSR-E bands and the MODIS land surface tem-perature product indicated that the 89 GHz vertical polarization is the best single band to retrieve land surface temperature. According to simulation analysis with AIEM,the difference of different frequen-cies can eliminate the influence of water in soil and atmosphere,and also the surface roughness partly. The analysis results indicate that the radiation mechanism of surface covered snow is different from others. In order to retrieve land surface temperature more accurately,the land surface should be at least classified into three types:water covered surface,snow covered surface,and non-water and non-snow covered land surface. In order to improve the practicality and accuracy of the algorithm,we built different equations for different ranges of temperature. The average land surface temperature er-ror is about 2―3℃ relative to the MODIS LST product. | MAO KeBiao SHI JianCheng LI ZhaoLiang QIN ZhiHao LI ManChun XU Bin | 2007 | Science China Earth Sciences2007，50，7： | 16 |
| 5 | Nickel cobalt phosphide with three-dimensional nanostructure as al highly efficient electrocatalyst for hydrogen evolution reaction in both I acidic and alkaline electrolytes显示文摘Transition metal phosphides (TMPs) are promising candidates for noble metal free electrocatalysts in water splitting applicati ons. In this work, we prese nt the facile syn thesis of nickel cobalt phosphide electrocatalyst with three-dime nsional nano structure (3D-NiCoP) on the nickel foam, via hydrothermal reaction and phosphorization. The as-prepared electrocatalyst exhibits an excellent activity for hydrogen evolution reaction (HER) in both acidic and alkaline electrolytes, with small overpotentials to drive 10 mA/cm^2 (80 mV for 0.5 M H2SO4, 105 mV for 1 M KOH), small Tafel slopes (37 mV/dec for 0.5 M H2SO4, 79 mV/dec for 1 M KOH), and satisfying durability in long-term electrolysis. 3D-NiCoP also shows a superior HER activity compared to single metal phosphide, such as cobalt phosphide and nickel phosphide. The outstanding performa nee for HER suggests the great pote ntial of 3D-NiCoP as a highly efficient electrocatalyst for water splitting technology. | Bo Ma Zhengchun Yang Yantao Chen Zhihao Yuan | 2019 | Nano Research2019，12，2： | 14 |
| 6 | A regional tectonic event of Katian(Late Ordovician) age across three major blocks of China显示文摘The present paper deals with a tectonic event of Late Ordovician age affecting three blocks of China,i.e.South China,North China and Tarim.In the North China and the Tarim platforms,as well as their marginal belts,there was a regional uplift during the early Katian Stage of the Ordovician.The uplift was indicated by the unconformities between the Ordovician successions and overlying late Paleozoic strata.New biostratigraphic studies of conodonts and graptolites from many sections at Longxian and Yaoxian,North China shows that the youngest Ordovician strata are of the early Katian age corresponding to graptolite Diplacanthograptus spiniferus Biozone.The same level has been recognized to represent the uppermost Ordovician in the platform area of Tarim,whereas in the marginal belt the top boundary of the Ordovician is slightly younger,corresponding to the graptolite Dicellograptus complanatus Biozone.Thus,the regional uplift in North China and Tarim is shown by the disconformity between the early Katian strata and Late Paleozoic strata,the onset coinciding with that of the Kwangsian Orogeny in South China.The designation Kwangsian Orogeny later fell into disuse and was replaced by the term Caledonian Orogeny.However,in terms of geographic location,tectonic nature,and the timing of activity,the Caledonian Orogeny differs significantly from the orogenic event in South China,and the continued use of this term in South China is inappropriate and misleading. | CHEN Xu BERGSTRM Stig M ZHANG YuanDong WANG ZhiHao | 2013 | Chinese Science Bulletin2013，58，34： | 12 |
| 7 | Overexpression of cotton (Gossypium hirsutum) dirigentl gene enhances lignification that blocks the spread of Verticillium dahliae显示文摘Dirigent 总科在整个植物王国丰富,特别脉管的植物。阐明棉花(Gossypium hirsutum ) 的功能在木质化的 DIR 基因,编码通常认为的 dirigent 蛋白质的二 cDNAs (指明的 GhDIR1 和 GhDIR2 ) 从棉花 cDNA 图书馆被孤立。实时量的反向的抄写聚合酶链反应分析表明那个 GhDIR1 抄本优先地在棉花胚轴被积累,而 GhDIR2 主要在棉花纤维被表示。GhDIR1 基因的 Overexpression 导致了转基因的棉花植物的木质素内容的增加,与野类型的相比。组织化学的试金表明转基因的植物在外皮和脉管的捆比野类型的显示了更普遍的木质化。而且,转基因的棉花植物显示了更多的忍耐到 Verticillium dahliae 的感染。我们的数据建议 GhDIR1 可以涉及能堵住真菌的病原体 V 的传播的棉花木质化。dahliae。 | Haiyan Shi Zhihao Liu Li Zhu Chaojun Zhang Yun Chen Ying Zhou Fuguang Li Xuebao Li | 2012 | Acta Biochimica et Biophysica Sinica2012，44，7： | 12 |
| 8 | Recent progress in background-free latent fingerprint imaging显示文摘 | Yingqian Wang Jie Wang Qinqin Ma Zhihao Li Quan Yuan | 2018 | Nano Research2018，11，10： | 11 |
| 9 | Multi-UAV coordination control by chaotic grey wolf optimization based distributed MPC with event-triggered strategy显示文摘The paper proposes a new swarm intelligence-based distributed Model Predictive Control(MPC)approach for coordination control of multiple Unmanned Aerial Vehicles(UAVs).First,a distributed MPC framework is designed and each member only shares the information with neighbors.The Chaotic Grey Wolf Optimization(CGWO)method is developed on the basis of chaotic initialization and chaotic search to solve the local Finite Horizon Optimal Control Problem(FHOCP).Then,the distributed cost function is designed and integrated into each FHOCP to achieve multi-UAV formation control and trajectory tracking with no-fly zone constraint.Further,an event-triggered strategy is proposed to reduce the computational burden for the distributed MPC approach,which considers the predicted state errors and the convergence of cost function.Simulation results show that the CGWO-based distributed MPC approach is more computationally efficient to achieve multi-UAV coordination control than traditional method. | Yingxun WANG Tian ZHANG Zhihao CAI Jiang ZHAO Kun WU | 2020 | Chinese Journal of Aeronautics2020，33，11： | 9 |
| 10 | Gα_s Relays Sphingosine-1-Phosphate Receptor 1 Signaling to Stabilize Vascular Endothelial-Cadherin at Endothelial Junctions to Control Mouse Embryonic Vascular Integrity显示文摘Sphingosine-1-phosphate receptor 1(S1PR1),a G protein-coupled receptor(GPCR),controls vascular stability by stabilizing vascular endothelial(VE)-cadherin junctional localization and inhibiting vascular endothelial growth factor receptor 2(VEGFR2) signaling.However,the molecular mechanisms that link S 1PR1 signaling to intracellular effectors remain unknown,In this study,we demonstrate that the heterotrimeric G protein subfamily member Gα_s,encoded by GNAS,acts as a relay mediator of S1PR1 signaling to control vascular integrity by stabilizing VE-cadherin at endothelial junctions.The endothelial cell-specific deletion of Gαs in mice causes early embryonic lethality with massive hemorrhage and a disorganized vasculature.The immunostalning results revealed that Gα_s deletion remarkably reduces the junctional localization of VE-cadherin,whereas the mural cell coverage of the vessels is not impaired.In addition,we found that Gαs depletion blocks the S1PRl-activation induced VE-cadherin stabilization at junctions,supporting that Gα_s acts downstream of S1PR1 signaling,Thus,our results demonstrate that Gα_s is an essential mediator to relay S1PR1 signaling and maintain vascular integrity. | Ximing Shao Ke Liu Yi Fan Zhihao Ding Min Chen Minyan Zhu Lee S.Weinstein Hongchang Li Huashun Li | 2015 | Journal of Genetics and Genomics2015，42，11： | 8 |
| 11 | Effect of low-frequency electromagnetic field on the as-cast microstructure of a new super high strength aluminum alloy by horizontal continuous casting显示文摘The super high strength aluminum alloy ingots with 100 mm in diameter were cast by the process of low-frequency electromagnetic horizontal continuous casting (LFEHC) and the effect of electromagnetic field on the as-cast microstructure was studied. Results show that microstructure of the sample prepared by the LFEHC process was greatly refined. Microstructures at the border and the center of the ingots were fine, uniform and rosette-shaped. Electromagnetic frequency plays a key role in microstructure refining. Fine and uniform microstructures can be obtained with optimal electromagnetic frequency. In this experiment, under a frequency of 30 Hz the microstructure was the finest and the most uniform. | Yubo ZUO Jianzhong CUI Yang WANG Xiaotao LIU Zhihao ZHAO Haitao Zhang | 2005 | China Foundry2005，2，1： | 8 |
| 12 | Deterministic secure quantum communication without unitary operation based on high-dimensional entanglement swapping显示文摘By analysis of the basic properties of entanglement swapping of high-dimensional Bell states,a universal and general deterministic secure quantum communication(DSQC)protocol is proposed,in which unitary operation is not required.By making use of the results of high-dimensional Bell measurement,the sender and the receiver can encode and decode the message respectively by performing the modular addition and subtraction.Two mutually complementary bases are constructed;and according to the property of mutual complement,a method for checking security of the high-dimensional quantum channel is put forward.Some common attack strategies are analyzed,and the corresponding error rates are calculated.Then the upper bound of the threshold of error rate is deduced. | LIU ZhiHao CHEN HanWu LIU WenJie XU Juan LI ZhiQiang | 2012 | Science China(Information Sciences)2012，55，2： | 7 |
| 13 | Parameter Group Optimization by Combining CUBE with Surface Filtering and Its Application显示文摘Shallow water multi-beam echo sounders(MBESs)are characterized by their high resolution and high density,and MBES data processing is a hotspot in modern marine surveying.The Combined Uncertainty and Bathymetry Estimator(CUBE)is the mainstream MBES data processing algorithm,although little is known about its core theories and parameters.In this paper,the basic principle,mathematical model,key parameters,and main processing steps of CUBE are described systematically.A parameter group optimization method that combines CUBE with a surface filter is established.Additionally,an example is given that shows the steps for parameter group optimization,including selection of a typical area,parameter group testing,and comparative analysis,and the method is then applied to shallow water MBES data processing.The results show that the method can improve the accuracy and efficiency of automatic data processing effectively,and it is thus of engineering application value. | Dineng ZHAO Ziyin WU Jieqiong ZHOU Mingwei WANG Zhihao LIU Jiabiao LI | 2020 | Journal of Geodesy and Geoinformation Science2020，3，2： | 7 |
| 14 | Preparation and visible photocatalytic dye degradation of Mn-TiO2/sepiolite photocatalysts显示文摘The performance of Mn-TiO2/sepiolite photocatalysts prepared by the solgel method and calcinated at different temperatures was studied in the photocatalytic degradation of direct fast emerald green dye under visible light irradiation,and a series of analytical techniques such as XRD,SEM,FTIR,TG-DSC,XPS,UV-vis-DRS and Raman spectroscopy were used to characterize the morphology,structure and optical properties of the photocatalysts.It is found that the anatase TiO2 was formed in all photocatalysts.Mn4+might incorporate into the lattice structure of TiO2 and partially replace Ti4+,thus causing the defects in the crystal structure and the broadening of the spectral response range of TiO2.At the same time,TiO2 particles were dispersed on the surface of the sepiolite,which immobilized TiO2 particles with sepiolite via the bond of Ti-O-Si.Mn-TiO2/sepiolite calcined at 400°C exhibits the highest photocatalytic activity and the degradation rate of direct fast emerald green is up to 98.13%.Meanwhile,it also shows good stability and universality. | Pengfei Zhu Zhihao Ren Ruoxu Wang Ming Duan Lisi Xie Jing Xu Yujing Tian | 2020 | Frontiers of Materials Science2020，14，1： | 6 |
| 15 | Transcription factors AS1 and AS2 interact with LHP1 to repress KNOX genes in Arabidopsis显示文摘Polycomb group proteins are important repressors of numerous genes in higher eukaryotes. However, the mechanism by which Polycomb group proteins are recruited to specific genes is poorly understood. In Arabidopsis, LIKE HETEROCHROMATIN PROTEIN 1(LHP1), also known as TERMINAL FLOWER 2, was originally proposed as a subunit of polycomb repressive complex 1(PRC1) that could bind the tri-methylated lysine 27 of histone H3(H3K27me3) established by the PRC2. In this work, we show that LHP1 mainly functions with PRC2 to establish H3K27me3, but not with PRC1 to catalyze monoubiquitination at lysine 119 of histone H2 A. Our results show that complexes of the transcription factors ASYMMETRIC LEAVES 1(AS1) and AS2 could help to establish the H3K27me3 modification at the chromatin regions of Class-I KNOTTED1-like homeobox(KNOX) genes BREVIPEDICELLUS andKNAT2 via direct interactions with LHP1. Additionally, our transcriptome analysis indicated that there are probably more common target genes of AS1 and LHP1 besides Class-I KNOX genes during leaf development in Arabidopsis. | Zhongfei Li Bin Li Jian Liu Zhihao Guo Yuhao Liu Yan Li Wen-Hui Shen Ying Huang Hai Huang Yijing Zhang Aiwu Dong | 2016 | Journal of Integrative Plant Biology2016，58，12： | 6 |
| 16 | Location layout design of aircraft parts assembly based on MSVR显示文摘Location layout of aircraft assembly is an important factor affecting product quality.Most of the existing re-searches use the combination of finite element analysis and intelligent algorithm to optimize the location layout,which are limited by numerical simulation accuracy and the selection and improvement of intelligent algorithms.At present,the analysis and decision-making technology based on field data is gradually applied in aircraft manufacturing.Based on the perception data of intelligent assembly unit of aircraft parts,a regression model of multi-input and multioutput support vector machine with Gauss kernel function as radial basis function is established,and the hyperparameters of the model are optimized by hybrid particle swarm optimization genetic algorithm(PSO-GA).GA-MSVR,PSO-MSVR and PSOGA-MSVR model are constructed respectively,and their results show that PSOGA-MSVR model has the best performance.Finally,the design of the aircraft wing location layout is taken as an example to verify the effectiveness of the method. | Xining LI Zhihao ZHAO | 2020 | Chinese Journal of Aeronautics2020，33，5： | 6 |
| 17 | Far-field super-resolution imaging by nonlinearly excited evanescent waves显示文摘Abbe’s resolution limit,one of the best-known physical limitations,poses a great challenge for any wave system in imaging,wave transport,and dynamics.Originally formulated in linear optics,the Abbe limit can be broken using nonlinear optical interactions.We extend the Abbe theory into a nonlinear regime and experimentally demonstrate a far-field,label-free,and scan-free super-resolution imaging technique based on nonlinear four-wave mixing to retrieve near-field scattered evanescent waves,achieving a sub-wavelength resolution ofλ∕5.6.This method paves the way for numerous new applications in biomedical imaging,semiconductor metrology,and photolithography. | Zhihao Zhou Wei Liu Jiajing He Lei Chen Xin Luo Dongyi Shen Jianjun Cao Yaping Dan Xianfeng Chen Wenjie Wan | 2021 | Advanced Photonics2021，3，2： | 6 |
| 18 | Ordovician integrative stratigraphy and timescale of China显示文摘In this chapter, starting with a brief review of the research history and current status in the studies of the Ordovician chronostratigraphy in China, the subdivision of the Ordovician System, definition and recognition of its series and stage boundaries, and possible stratigraphic gaps are discussed in details in order to establish a multidisciplinary stratigraphic correlation through an integrated approach including lithostratigraphy, biostratigraphy, radiometric dating, chemostratigraphy and magnetostratigraphy. Being internationally accepted, the Ordovician System is now subdivided into three series and seven stages, in ascending order, Lower(Tremadocian, Floian), Middle(Dapingian, Darriwilian) and Upper series(Sandbian, Katian,Hirnantian). Three of the seven 'Golden Spikes' defining the bases of the Ordovician stages, which were established in 1997–2007, are located in China. As a regionally applied chronostratigraphy, the Ordovician System was subdivided in China into Lower(Xinchangian, Yiyangian), Middle(Dapingian, Darriwilian) and Upper series(Neichiashanian, Chientangkiangian,Hirnantian). This scheme agrees largely with the standard international classification, which can actually be directly applied to China, except for some special circumstances where the Neichiashanian and Chientangkiangian stages of the Upper Ordovician are used. Based on the new studies in recent years and distinctions and differences recognized in the development of the Ordovician System in the constituent terranes of China, a new framework for correlation among the major Chinese palaeoplates or terranes, e.g. South China, North China(including Tarim and Qaidam) and Xizang(Tibet)-western Yunnan, has been established. However, it has been recognized herein that uncertainties still remain on defining the base of the Tremadocian,Dapingian and Katian, and on the correlation between different mega-facies. More specifically, for the Tremadocian, the precise correlation of its base will depend on the better-defined conodont taxonomy, while for the Dapingian and Katian, on the correlation between different mega-facies. It is worthwhile to note that the chemostratigraphic studies of the Ordovician System in China produced the carbonate δ13 C curves for the Darriwilian(Middle Ordovician) and Katian(Upper Ordovician), which show significant differences from the composite global curve. Record of the Ordovician isotopic dating is relatively rare in China, with only three reliable ages from zircons that are all from the upper Katian to Hirnantian of the Upper Ordovician.Abundant bentonite beds in the Upper Ordovician of South China will also provide unique opportunities to advance the isotopic dating and related researches. Studies on the Ordovician magnetostratigraphy need to be significantly enhanced in China, as currently all the available results are restricted to the Lower Ordovician of North China, although they can be correlated with those known from other parts of the world. The analysis of the durational unevenness of the seven stages in the Ordovician supports the possibility to further subdivide the long-durational Tremadocian, Darriwilian and Katian stages, each into two substages. | Yuandong ZHANG Renbin ZHAN Yongyi ZHEN Zhihao WANG Wenwei YUAN Xiang FANG Xuan MA Junpeng ZHANG | 2019 | Science China Earth Sciences2019，62，1： | 6 |
| 19 | A Tractable Approach to Analyzing the Physical-Layer Security in K-Tier Heterogeneous Cellular Networks显示文摘This study proposes a tractable approach to analyze the physical-layer security in the downlink of a multi-tier heterogeneous cellular network. This method is based on stochastic geometry, has low computational complexity, and uses the two-dimensional Poisson point process to model the locations of K-tier base stations and receivers, including those of legitimate users and eavesdroppers. Then, the achievable secrecy rates for an arbitrary user are determined and the upper and lower bounds of secrecy coverage probability derived on the condition that cross-tier interference is the main contributor to aggregate interference. Finally, our analysis results reveal the innate connections between information-theoretic security and the spatial densities of legitimate and malicious nodes. | ZHONG Zhihao PENG Janhua LUO Wenyu HUANG Kaizhi | 2015 | China Communications2015，12，S1： | 6 |
| 20 | Wind tunnel tests of stratospheric airship counter rotating propellers显示文摘Aerodynamic performance of the high-altitude propeller,especially the counter rotation effects,is experimentally studied.Influences of different configurations on a stratospheric airship,included 2-blade counter-rotating propeller(CRP),dual 2-blade single rotation propellers(SRPs) and 4-blade SRP,are also indicated.This research indicates that the effect of counter rotation can greatly improve the efficiency.It shows that the CRP configuration results in a higher efficiency than the dual 2-blade SRPs configuration or4-blade SRP configuration under the same advance ratio,and the CRP configuration also gains the highest efficiency whether under the situation of providing the same trust or absorbing the same power.It concludes that,for a stratospheric airship,the CRP configuration is better than the multiple SRPs configuration or a multi-blade SRP one. | Yaxi Chen Peiqing Liu Zhihao Tang Hao Guo | 2015 | Theoretical & Applied Mechanics Letters2015，5，1： | 5 |
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