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Recognition model and algorithm of projectiles by combining particle swarm optimization support vector and spatial-temporal constrain

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Defence Technology（防务技术） 2023年第9期27卷 273-283页

作者： Han-shan li School of Electronic and Information Engineering Xi'an Technological UniversityXi'an710021China

In order to improve the recognition rate and accuracy rate of projectiles in six sky-screens intersection test system,this work proposes a new recognition method of projectiles by combining particle swarm optimization support vector and spatial-temporal constrain of six sky-screens detection *** on the measurement principle of the six sky-screens intersection test system and the characteristics of the output signal of the sky-screen,we analyze the existing problems regarding the recognition of *** order to optimize the projectile recognition effect,we use the support vector machine and basic particle swarm algorithm to form a new recognition *** set up the particle swarm algorithm optimization support vector projectile information recognition model that conforms to the six sky-screens intersection test *** also construct a spatial-temporal constrain matching model based on the spatial geometric relationship of six sky-screen intersection,and form a new projectile signal recognition algorithm with six sky-screens spatial-temporal information constraints under the signal classification mechanism of particle swarm optimization algorithm support vector *** on experiments,we obtain the optimal penalty and kernel function radius parameters in the PSO-SVM algorithm;we adjust the parameters of the support vector machine model,train the test signal data of every sky-screen,and gain the projectile signal classification ***,according to the signal classification results,we calculate the coordinate parameters of the real projectile by using the spatial-temporal constrain of six sky-screens detection sensor,which verifies the feasibility of the proposed algorithm.

关键词： Six sky-screens intersection test system Pattern recognition Particle swarm optimization Support vector machine Projectile

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Isotopic dependence of the yield ratios of light fragments from different projectiles and their unified neutron skin thicknesses

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Nuclear Science and Techniques 2024年第3期35卷 228-236页

作者： Ting-Zhi Yan shan li School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

The yield ratios of neutron-proton(R(n/p))and^(3)H-^(3)He(R(^(3)H∕^(3)He))with reduced rapidity from 0 to 0.5 were simulated at 50 MeV/u even-even ^(36−56)Ca+^(40)Ca,even-even ^(48−78)Ni+^(58)Ni,and ^(100−139)Sn(every third isotopes)+112 Sn for full reduced impact parameters using the isospin-dependent quantum molecular dynamics(IQMD)*** neutron and proton density distributions and root-mean-square radii of the reaction systems were obtained using the Skyrme-Hartree-Fock model,which was used for the phase space initialization of the projectile and target in *** defined the unified neutron skin thickness asΔRnp=^(1∕2) n−^(1∕2)p,which was negative for neutron-deficient *** unifiedΔRnp values for nuclei with the same relative neutron excess from different isotopic chains were nearly equal,except for extreme neutron-rich isotopes,which is a type of scaling *** yield ratios of the three isotopic chain-induced reactions,which depended on the reduced impact parameter and unified neutron skin thickness,were *** results showed that both R(n/p)and R(^(3)H∕^(3)He)decreased with a reduced impact parameter for extreme neutron-deficient isotopes;however,they increased with reduced impact parameters for extreme neutron-rich isotopes,and increased with theΔRnp of the projectiles for all reduced impact *** addition,a scaling phenomenon was observed betweenΔR np and the yield ratios in peripheral colli-sions from different isotopic chain projectiles(except for extreme neutron-rich isotopes).Thus,R(n/p)and R(^(3)H∕^(3)He)from peripheral collisions were suggested as experimental probes for extracting the neutron or proton skin thicknesses of non-extreme neutron-rich nuclei from different isotopic chains.

关键词： Exotic nuclei Unified neutron skin thickness Yield ratios IQMD

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Odor representation and coding by the mitral/tufted cells in the olfactory bulb

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第10期25卷 824-840页

作者： Panke WANG shan li An’an li School of Biomedical Engineering Guangdong Medical UniversityDongguan 523808China Jiangsu Key Laboratory of Brain Disease and Bioinformation Research Center for Biochemistry and Molecular BiologyXuzhou Medical UniversityXuzhou 221002China

The olfactory bulb(OB)is the first relay station in the olfactory system and functions as a crucial *** can represent odor information precisely and accurately in an ever-changing *** the only output neurons in the OB,mitral/tufted cells encode information such as odor identity and ***,the neural strategies and mechanisms underlying odor representation and encoding in the OB have been investigated *** we review the main progress on this *** first review the neurons and circuits involved in odor representation,including the different cell types in the OB and the neural circuits within and beyond the *** will then discuss how two different coding strategies—spatial coding and temporal coding—work in the rodent ***,we discuss potential future directions for this research ***,this review provides a comprehensive description of our current understanding of how odor information is represented and encoded by mitral/tufted cells in the OB.

关键词： Olfactory bulb Mitral/tufted cells Odor identity Neural representation Information encoding

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Global Existence and Uniqueness of Weak Solution to Nonlinear Viscoelastic Full Marguerre-von Kármán Shallow Shell Equations

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Acta Mathematica Sinica,English Series 2009年第12期25卷 2133-2156页

作者： Fu shan li School of Mathematical Sciences Qufu Normal University Qufu 273165 P. R. China

By Galerkin finite element method, we show the global existence and uniqueness of weak solution to the nonlinear viscoelastic full Marguerre-von Karman shallow shell equations.

关键词： global solution viscoelastic Marguerre-von Karman shallow shell

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Convergence of the Solution to General Viscoelastic Koiter Shell Equations

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Acta Mathematica Sinica,English Series 2007年第9期23卷 1683-1688页

作者： Fu shan li School of Mathematical Sciences Qufu Normal University Qufu 273165 P. R. China and Institute of Mathematics Fudan University Shanghai 200433 P. R. China

By applying the inequality of Korn＇s type without boundary conditions on a general surface, we prove that the scaled displacement of the two-dimensional linearly viscoelastic Koiter＇s shell converges to the solution... 详细信息

关键词： Koiter's shells Korn's inequality membrane shells

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Approximation Theorems and Fixed Point Theorems for Various Classes of 1-set-contractive Mappings in Banach Spaces

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Acta Mathematica Sinica,English Series 2001年第1期17卷 103-112页

作者： li shan liU Department of Mathematics Qufu Normal University

In this paper, we will prove that Ky Fan’s Theorem (Math. Z. 112(1969), 234-240) is true for 1-set-contractive maps defined on a bounded closed convex subset K in a Banach space with int K≠ . This class of 1-set-contractive maps includes condensing maps, nonexpansive maps, semicontractive maps, LANE maps and others. As applications of our theorems, some fixed point theorems of non-self- maps are proved under various well-known boundary conditions. Our results are generalizations and improvements of the recent results obtained by many authors.

关键词： Approximation theorems Fixed point theorems 1-set-contractive maps Semicontractive maps LANE maps

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Studies on Suction-Assisted Installation Behavior of Suction Caissons in Clay Under Various Undrained Shear Strengths

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China Ocean Engineering 2023年第6期37卷 989-999页

作者： li Da-yong HOU Xin-yu ZHANG Yu-kun MA Shi-li li shan-shan Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China College of Civil Engineering Weifang UniversityWeifang 261061China

Suction caissons are widely used for anchoring floating platform and offshore wind *** of the suction caisson into the desired position under the combination of its self-weight and applied suction resulted from pumping out the encased water is integral to practical *** tests were carried out to investigate the suctionassisted installation of suction caissons in clay under various undrained shear *** was found that there exists a critical penetration depth *** the penetration depth is smaller than the critical value,the soil plug undrained shear strength is higher than intact clay(i.e.,clay prior to installation).However,when the penetration depth is greater than the critical penetration depth,the undrained shear strength of soil plug is lower than intact *** critical value decreases with the increasing consolidation time and undrained shear strength of *** suction-assisted installation,cracks occur around suction *** installation way has little effect on the crack *** influence range(i.e.,the maximum distance between the crack and the suction caisson edge)was found to increase with the increasing friction coefficient of interface between the suction caisson wall and soil and decreases with the increasing soil undrained shear *** addition,the drained condition of the clay during installation is dominated by the caisson aspect ratio,the undrained shear strength and the friction coefficient between the caisson wall and *** to estimate the penetration resistance and the required suction to install the suction caisson are summarized.

关键词： suction caisson suction-assisted installation model tests undrained shear strength of clay soil deformation

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Earth Pressure Distribution and Sand Deformation Around Modified Suction Caissons(MSCs) Under Monotonic Lateral Loading

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China Ocean Engineering 2019年第2期33卷 198-206页

作者： li Da-yong li shan-shan ZHANG Yu-kun CHEN Fu-quan College of Civil Engineering Fuzhou University Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology

The modified suction caisson(MSC) is a novel type of foundation for ocean engineering, consisting of a short external closed-top cylinder-shaped structure surrounding the upper part of the regular suction caisson(RSC). The MSC can provide larger lateral bearing capacity and limit the deflection compared with the RSC. Therefore, the MSC can be much more appropriate to use as an offshore wind turbine foundation. Model tests on the MSC in saturated sand subjected to monotonic lateral loading were carried out to investigate the effects of external structure sizes on the sand surface deformation and the earth pressure distribution along the embedded depth. Test results show that the deformation range of the sand surface increases with the increasing width and length of the external structure. The magnitude of sand upheaval around the MSC is smaller than that of the RSC and the sand upheaval value around the MSC in the loading direction decreases with the increasing external structure dimensions. The net earth pressure in the loading direction acting on the internal compartment of the MSC is smaller than that of the RSC at the same embedded depth. The maximum net earth pressure acting on the external structure outer wall in the loading direction is larger than that of the internal compartment, indicating that a considerable amount of the lateral load and moment is resisted by the external skirt structure.

关键词： MSC (modified suction caisson) RSC (regular suction caisson) model tests monotonic lateral loading deformation of sand surface earth pressure distribution

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Terahertz Polarization Detector Based on PMMA Grating Pipe

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Journal of Electronic Science and Technology 2016年第1期14卷 2-5页

作者： shan-shan li li Wang Sheng-Jiang Chang the Institute of Modern Optics College of Electronic Information and Optical EngineeringNankai UniversityTianjin 30007lChina the School of Computer and Information Engineering Tianjin Chengjian UniversityTianjin 300384China

In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） *** asymmetric polarization-related structure is fabricated by etching different grating structures on the external surface of the *** results show that when the pipe rotates up to 90°,the peak of the transmission spectrum can evidently shift towards the low frequency,which means the pipe with grating structures can serve as a polarization *** design possesses the merits of a simple structure and easy fabrication.

关键词： Angle sensing antiresonant reflecting optical waveguide PMMA pipe

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Three-dimensional coordinates test method with uncertain projectile proximity explosion position based on dynamic seven photoelectric detection screen

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Defence Technology（防务技术） 2022年第9期18卷 1643-1652页

作者： Han-shan li Xiao-qian Zhang School of Electronic and Information Engineering Xi'an Technological UniversityXi'an710021China

To objectively obtain the three-dimensional coordinates of the projectile fuze proximity explosion when projectile intersects the head of missile target, we propose a dynamic seven photoelectric detection screen test method, which is made up of six plane detection screens and a flash photoelectric dynamic detection screen. The three-dimensional coordinates calculation model of the projectile proximity explosion position based on seven plane detection screens with dynamic characteristics is *** to the relation of the dynamic seven photoelectric detection screen planes and the time values,the analytical function of the projectile proximity explosion position parameters under non-linear motion is derived. The projectile signal filtering method based on discrete wavelet transform is explored in this work. Additionally, the projectile signal recognition algorithm using an improved particle swarm is proposed. Based on the characteristics of the time duration and the signal peak error for the projectile passing through the detection screen, the signals attribution of the same projectile passing through six detection screens are analyzed for obtaining precise time values of the same projectile passing through the detection screens. On the basis of the projectile fuze proximity explosion test, the linear motion model and the proposed non-linear motion model are used to calculate and compare the same group of projectiles proximity explosion position parameters. The comparison of test results verifies that the proposed test method and calculation model in this work accurately obtain the actual projectile proximity explosion position parameters.

关键词： Dynamic multi-screen array plane Flash photoelectric detection target Projectile signal processing Particle swarm Proximity explosion fuze Three-dimensional coordinate

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