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On Affine Hypersurfaces with Parallel Cubic Form Relative to Affineα-connection

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1099-1114页

作者： ce ce li Cheng XING Hui Yang XU School of Mathematics and Statistics He’nan University of Science and TechnologyLuoyang 471023P.R.China School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071P.R.China

Similar to Nomizu-Pinkall's geometric characterization of the Cayley surface and Hu-li-Zhang's characterization of the Cayley hypersurface,how can one characterize the generalized Cayley hypersurfaces?In this paper,by the affineα-connection of statistical manifolds,we study affine hypersurfaces with parallel cubic form relative to the affineα-*** the main results,we complete the classification of such hypersurfaces if its affine metric is either definite,or Lorentzian withα≠-***,we give a new characterization of the generalized Cayley hypersurfaces to answer the question.

关键词： Affine hypersurface parallel cubic form affineα-connection Einstein metric

Characterization of the Generalized Calabi Composition of Affine Hyperspheres

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Acta Mathematica Sinica,English Series 2015年第10期31卷 1531-1554页

作者： Miroslava ANTI Ze Jun HU ce ce li Luc VRANCKEN University of Belgrade Faculty of Mathematics Studentski trg 16Pb.550 11000 Belgrade Serbia School of Mathematics and Statistics Zhengzhou University School of Mathematics and Statistics He'nan University of Science and Technology UVHC LAMAV F-59313 Valenciennes France and Katholieke Universiteit Leuven Departement WiskundeBE-3001 Leuven Belgium

In this paper, continuing with Hu-li Vrancken and the recent work of Antid Dillen- Schoels-Vrancken, we obtain a decomposition theorem which settled the problem of how to determine whether a given locally strongly convex aitine hypersurface can be decomposed as a generalized Calabi composition of two affine hyperspheres, based on the properties of its difference tensor K and its affine shape operator S.

关键词： Generalized Calabi composition affine hyperspheres warped product

ResLNet:deep residual LSTM network with longer input for action recognition

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Frontiers of Computer Science 2022年第6期16卷 41-49页

作者： Tian WANG Jiakun li Huai-Ning WU ce li Hichem SNOUSSI Yang WU Institute of Artificial Intelligence Beihang UniversityBeijing100191China School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191China College of Electrical and Information Engineering Lanzhou University of TechnologyLanzhou730050China Institute Charles Delaunay-LM2S FRE CNRS 2019 University of Technology of TroyesTroyes10010France Institute for Research Initiatives Nara Institute of Science and TechnologyNara630-0192Japan

Action recognition is an important research topic in video analysis that remains very *** recognition relies on learning a good representation of both spatial information(for appearance)and temporal information(for motion).These two kinds of information are highly correlated but have quite different properties,leading to unsatisfying results of both connecting independent models(e.g.,CNN-LSTM)and direct unbiased co-modeling(e.g.,3DCNN).Besides,a long-lasting tradition on this task with deep learning models is to just use 8 or 16 consecutive frames as input,making it hard to extract discriminative motion *** this work,we propose a novel network structure called ResLNet(Deep Residual LSTM network),which can take longer inputs(e.g.,of 64 frames)and have convolutions collaborate with LSTM more effectively under the residual structure to learn better spatial-temporal representations than ever without the cost of extra computations with the proposed embedded variable stride *** superiority of this proposal and its ablation study are shown on the three most popular benchmark datasets:Kinetics,HMDB51,and *** proposed network could be adopted for various features,such as RGB and optical *** to the limitation of the computation power of our experiment equipment and the real-time requirement,the proposed network is tested on the RGB only and shows great performance.

关键词： action recognition deep learning neural network

Multifractal filtering method for extraction of ocean eddies from remotely sensed imagery

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Acta Oceanologica Sinica 2006年第5期25卷 27-38页

作者： GE Yong DU Yunyan CHENG Qiuming li ce State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences ＆ Natural Re-sources Research Chinese Academy of Sciences Beijing 100101 China Department of Earth and Space Science and Engineering York University Toronto M3J 1P3 Canada State Key Laboratory of Geo-Processes and Mineral Resources China University of Geosciences Beijing 100083 China

Traditional methods of extracting the ocean wave eddy information from remotely sensed imagery mainly use the edge detection technology such as Canny and Hough operators. However, due to the complexities of ocean eddies and image itself, it is sometimes difficult to successfully detect ocean eddies using these methods. A mnltifractal filtering technology is proposed for extraction of ocean eddies and demonstrated using NASA MODIS, SeaWiFS and NOAA satellite data set in the typical area, such as ocean west boundary current. Results showed that the new method has a superior performance over the traditional methods.

关键词： remotely sensed imagery extraction of ocean eddies multifractal filtering

Infl uence of nitrate concentrations on EH40 steel corrosion aff ected by coexistence of Desulfovibrio desulfuricans and Pseudomonas aeruginosa bacteria

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Journal of Oceanology and limnology 2022年第4期40卷 1448-1461页

作者： Zhihua SUN Jiajia WU Dun ZHANG ce li liyang ZHU Ee li Key Laboratory of Marine Environmental Corrosion and Biofouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China center for Ocean Mega-Science Chinese Academic of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Materials and Related Technologies Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China

Nitrate addition is a common bio-competitive exclusion(Bce)method to mitigate corrosion in produced water reinjection systems,which can aff ect microbial community compositions,especially nitrate and sulfate reducing bacteria,but its eff ectiveness is in *** investigated the infl uence of nitrate concentrations on EH40 steel corrosion aff ected by coexistence of Desulfovibrio vulgaris and Pseudomonas aeruginosa *** demonstrate that only mixed bacteria or nitrate had little eff ect on EH40 steel corrosion,and nitrate could accelerate the corrosion of EH40 steel through the action of *** corrosion promotion of nitrate was dependent on its concentrations,which increased from 0 to 5 g/L and decreased from 5 to 50 g/*** diff erences were believed to be related to the regulation of nitrate in the growth of bacteria and biofi ***,care must be taken to Bce method with nitrate when nitrate reducing bacteria with high corrosive activity are present in the environments.

关键词： microbiologically influenced corrosion nitrate Desulfovibrio vulgaris Pseudomonas aeruginosa

Modeling of Amperometric Immunosensor for CMOS Integration

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稀有金属材料与工程 2006年第A03期35卷 439-442页

作者： ce li Haigang Yang Shanhong Xia Chao Bian The State Key Lab of Transducer Technology Institute of Electronics CAS Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

A circuit model of the Amperometric immunosensor for use in the biosensor system-on-chip simulation is proposed in this *** model parameters are extracted with several methods and verified by MATLAB and SPIce simulation.A CMOS potentiostat circuit required for conditioning the Amperometric immunosensor is also included in the circuit *** mean square error norm of the simulated curve against the measured one is 8.65×10^(-17) The whole circuit has been fabricated in a 0.35μm CMOS process.

关键词： amperometric microelectrode circuit model potentiostat folded-cascode

Dual-hand Gesture Controlled Quadcopter Robot 36

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Dual-hand Gesture Controlled Quadcopter Robot

High-efficiency reflection phase tunable metasurface at near-infrared frequencies

第36届中国控制会议

作者： Dong Zhang ce li Yachao Zhang Lanzhou University of Technology

ISBN: (纸本)9781538629185

The quadcopter aircraft has been widely used in many fields ***,the complicated and professional operation of the quadcopter still needs to be qualified by *** to simplify the operation control is one of the urgent problems in the further development of the quadcopter *** on the kinect sensor,a new simplified operation scheme is proposed,and a dual-hand controllable quadcopter robot is designed and extended to carry out the task of grasping and transporting *** the proposed scheme,firstly we obtain the 3D video stream data by ***,we perform noise pre-processing on the depth image to extract the stable skeleton node ***,the skeleton node data is used to establish the control signal reference coordinate system,and a dual-hand gesture information is mapped into the control information of the quadcopter and the mechanical *** the hardware system of PSoC as the core device and the software control system are *** experimental results show that the quadcopter robot can achieve stable control of the quadcopter attitude by dual-hand gestures,and use mechanical claw to grasp and convey a object by *** control method is simple and effective.

关键词： Kinect Gestures PSoC Quadcopter robot

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Chinese Physics B 2021年第5期30卷 650-654页

作者： ce li Wei Zhu Shuo Du Junjie li Changzhi Gu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences CAS Key Laboratory of Vacuum PhysicsUniversity of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Space Applied Physics and Chemistry Ministry of Education and Department of Applied PhysicsSchool of ScienceNorthwestern Polytechnical UniversityXi'an 710129China Songshan Lake Materials Laboratory Dongguan 523808China Collaborative Innovation center of Quantum Matter Beijing 100871China

The realization of active modulation of reflection phase based on metasurfaces is of great significance for flexible control of electromagnetic wavefront,which makes metasurfaces have practical application values in polarization conversion,beam steering,metalens,*** this paper,a reflection phase tunable gap-surface plasmon(GSP)metasurface based on phase change materials Ge_(2)Sb_(2)Te_(5)(GST)is designed and experimentally *** virtue of the characteristics of large permittivities difference before and after GST phase transition and the existence of stable intermediate states,the continuous modulation of near-infrared reflection phase larger than 200°has been *** the same time,through the reasonable design of the structure sizes,the reflection has been maintained at about 0.4 and basically does not change with the GST phase transition,which improved the working efficiency of the metasurface *** addition,the coupled-mode theory(CMT)is introduced to make a full analysis of the modulation mechanism of the reflection phase,which proves that the phase transition of GST can induce the transition of metasurface working state from overcoupling mode to critical coupling *** improvement of the metasurface working efficiency has practical values for wavefront modulation.

关键词： active metasurface phase change materials phase modulation

挤压Mg-li-Zn-ce-Y-Zr合金的热变形行为

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稀有金属材料与工程 2011年第1期40卷 90-95页

作者：陈昭运余春李志强盖登宇哈尔滨工程大学超轻材料与表面技术教育部重点实验室黑龙江哈尔滨150001

在温度T=250~450℃,应变速率为0.001~10s-1的条件下,利用Gleeble-3500热模拟试验机对挤压Mg-7.8%li-4.6%Zn-0.96%ce-0.85%Y-0.30Zr合金进行高温热压缩试验,分析流变应力曲线特点。合金的流变应力曲线表现出动态再结晶特征,动态再结晶是... 详细信息

在温度T=250~450℃,应变速率为0.001~10s-1的条件下,利用Gleeble-3500热模拟试验机对挤压Mg-7.8%li-4.6%Zn-0.96%ce-0.85%Y-0.30Zr合金进行高温热压缩试验,分析流变应力曲线特点。合金的流变应力曲线表现出动态再结晶特征,动态再结晶是热变形过程中的主要软化机制。流变应力峰值随温度的降低和应变速率的增大而升高。稀土相化合物和α相促进β相的动态再结晶,使α相再结晶减缓。在热变形过程中动态再结晶迅速,流变应力曲线表现为临界应变较小,加工硬化迅速被动态软化所掩盖。

关键词： Mg-li合金热变形流变应力动态再结晶