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A guidance and control design with reduced information for a dual-spin stabilized projectile

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Defence Technology（防务技术） 2024年第3期33卷 494-505页

作者： yu Wang Jiyan yu Xiaoming Wang jia Fangxiu Intelligent Ammunition Technology National Defense Key Discipline Laboratory Nanjing University of Science and TechnologyNanjingJiangsu210094China

In this paper,an integrated guidance and control method based on an adaptive path-following controller is proposed to control a spin-stabilized projectile with only translational motion information under the constraint of an actuator,uncertainties in aerodynamic parameters and measurements,and control system *** to the fairly high rotation speed,the dynamic model of this missile is strongly nonlinear,uncertain and coupled in pitch,yaw and roll channels.A theoretical equivalent resultant force and uncertainty compensation method are comprehensively used to realize decoupling of pitch and *** response to the strong nonlinear and time-varying characteristics of the dynamic system,the quasi-linear model whose parameters are obtained by interpolation of points selected as the segmentation points in the trajectory envelope,is used for calculation in each *** cope with the system uncertainty caused by model approximation,parameter uncertainty and ballistic interference,an extended state estimator is used to compensate the output feedback according to the test ballistic *** order to improve the tracking efficiency and ensure the tracking error convergence with only translational motion information,the virtual guide point,whose derivative is deduced according to the Lyapunov principle,is calculated in real time according to the projection relationship between the real-time position and the reference trajectory,and a virtual line-of-sight angle and the backstepping method are used for the design of the guidance and control *** order to avoid the influence of control input saturation on the guidance and control performance due to the actuator limitation and improve the robustness of the system,an anti-saturation compensator is designed according to the two-step *** feasibility and effectiveness of the path-following controller is verified through closed-loop flight simulations with measurement,control,and condition *** result

关键词： Spin-stabilized projectile Reduced information Path-following control Extended state observer Coupled nonlinear system Input saturation

Upwelling current and its relationship to the enrichment of organic matter in the Lower Silurian Longmaxi Formation,northern Chongqing-western Hubei area,southern China

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Journal of Palaeogeography 2024年第4期13卷 993-1015页

作者： Jun-Jun Shen jia-Kai Yan Peng-Wan Wang yu-Man Wang Lin Zhou yu-Bing Ji min Xu Hubei Cooperative Innovation Center of Unconventional Oil and Gas of Yangtze University Wuhan 430100Hubei ProvinceChina Hydrogeology and Engineering Geology Institute of Hubei Geological Bureau Jingzhou 434020Hubei ProvinceChina PetroChina Hangzhou Institute of Petroleum Geology Hangzhou 310023Zhejiang ProvinceChina PetroChina Research Institute of Petroleum Exploration and Development Bejing 100083China Exploration and Production Research Institute Jianghan Oifield CompanySINOPECWuhan 430100Hubei ProvinceChina Zhejiang Oilfield Company Integrated Center of Exploration and Development Hangzhou 310000Zhejiang ProvinceChina

Upwelling currents play a crucial role in the enrichment of organic matter,yet the mechanisms driving this process remain incompletely understood due to methodological and data resolution *** this paper,we employ a combination of biostratigraphic classification,qualitative methods,and quantitative methods to systematically analyze the sedimentological and geochemical characteristics of the Lower Silurian Longmaxi Formation in the northern Chongqing-western Hubei area,southern *** relationship between the upwelling currents and organic matter enrichment in the shale of the Longmaxi Formation is *** indicate that the upwelling currents in the study area were primarily influenced by the foreland flexure *** the Rhuddanian(flexure-sedimentation stage)to the Aeronian(flexure-migration stage),the more intense tectonic activity led to gradual opening of the barrier between the South Qinling Ocean and the Yangtze Platform,resulting in an increase in the influx of the oceanic *** upwelling currents significantly contributed to the organic matter production,albeit without substantially affecting the preservation *** the succession of the Longmaxi Formation,the organic matter content decreased gradually from the passive continental margin to the foreland flexural stagnant basin,which was mainly due to deterioration of the preservation conditions as a result of sea level fall and increased terrigenous *** the increase in the upwelling currents,they did not decisively control the organic matter ***,during the Rhuddanian to Aeronian period,the organic matter content decreased similarly from the passive continental margin to the foreland flexural stagnant basin,influenced by reduced organic matter production caused by weakening of the upwelling currents and the worsening preservation conditions caused by sea-level *** terrigenous input had a relatively minor *** results of t

关键词： Middle-Upper Yangtze Ordovician-Silurian transition Black shale Passive continental margin Foreland flexural stagnant basin Sedimentary paleoenvironment

Analysis of a new 5-phase bearingless induction motor

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第8期8卷 1311-1319页

作者： HUANG Jin KANG min YANG jia-qiang School of Electrical Engineering Zhejiang University Hangzhou 310027 China

This paper addresses the bearingless motor with a single set of multiphase windings. The interaction between M and M±1 pole-pair magnetic fields produces radial force. Based on this principle,a bearingless machine is obtained. Conventional bearingless machine has dual windings,levitation windings and torque windings,which produce the two magnetic fields. In the proposed bearingless motor,the two needed magnetic fields are produced by feeding two groups of currents to a single set of multiphase windings. Taking a 5-phase induction motor as example,the inductance matrices,considering air gap eccentricity,are calculated with the modified winding function method. The radial force analytical model is deduced by virtual displacement,and its results are validated by FEA. The mathematical model of the new bearingless machine is set up,and the simulation results verified the feasibility of this novel bearingless motor.

关键词： Air-gap-flux-oriented control Bearingless motor Multiphase Radial force Single set of windings Modified winding function method

Monascus vinegar alleviates high-fat-diet-induced inflammation in rats by regulating the NF-κB and PI3K/AKT/mTOR pathways

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Food Science and Human Wellness 2022年第4期11卷 943-953页

作者： Huanmei Meng jia Song Bingqian Fan Yingqi Li jiaojiao Zhang Jinping yu yu Zheng min Wang State Key Laboratory of Food Nutrition and Safety Key Laboratory of Industrial Fermentation MicrobiologyTianjin Engineering Research Centre of Microbial Metabolism and Fermentation Process ControlCollege of BiotechnologyTianjin University of Science&TechnologyTianjin 300457China Shandong Engineering Research Centre of Condiment Fermentation Technology Shandong Yutu Co.LtdZibo 255300China

Monascus vinegar(MV) is a typical fermented food with various health-promoting effects. This study aimed to evaluate the role of MV in alleviating high-fat-diet-induced inflammation in rats with hyperlipidemia and elucidate the possible regulatory mechanisms. In the study, serum lipid profiles, liver pathology and liver inflammatory cytokines were analyzed in hyperlipidemia rats with MV(0.5 mL/kg mb, 2 mL/kg mb). Results showed that the administration of MV alleviated dyslipidemia by decreasing the serum and liver levels of triglyceride and total cholesterol. Increase in hepatic lipase and carnitine palmitoyl transferase 1(CPT-1)levels and decrease in hepatocyte steatosis, nephritis, and intestinal tissue injury in the HD group showed that high-dose MV can significantly suppress hepatic lipid accumulation and steatosis. In addition, compared with the model(MOD) group, the HD group showed significantly down-regulated the level of serum or hepatic alanine aminotransferase(ALT), aspartate aminotransferase(AST), CPT-1, interleukin(IL)-2, IL-6, IL-12,and tumor necrosis factor α(TNF-α). Moreover, the HD group showed repressed hepatic nuclear factor κB(NF-κB) pathway and inactivated phosphatidylinositol 3-kinase(PI3K)/protein kinase B(Akt)/mammalian target of rapamycin(mTOR) pathway mitigated liver inflammation. Similar results were obtained from cell experiments. Collectively, these findings revealed that MV might attenuate high-fat-diet-induced inflammation by inhibiting the NF-κB and PI3K/Akt/mTOR pathways.

关键词： Monascus vinegar Hyperlipidemia Inflammation NF-κB PI3K/AKT/mTOR

Novel conductive polypyrrole/silk fibroin scaffold for neural tissue repair

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Neural Regeneration Research 2018年第8期13卷 1455-1464页

作者： Ya-Hong Zhao Chang-Mei Niu jia-Qi Shi Ying-yu Wang yu-min Yang Hong-Bo Wang Key Laboratory of Science and Technology of Eco-textiles Ministry of Education Jiangnan University Key Laboratory of Neuroregeneration Co-innovation Center of Neuroregeneration Nantong University Medical School Nantong University Wen Zheng College Soochow University

Three dimensional（3D） bioprinting, which involves depositing bioinks（mixed biomaterials） layer by layer to form computer-aided designs, is an ideal method for fabricating complex 3D biological structures. However, it remains challenging to prepare biomaterials with micro-nanostructures that accurately mimic the nanostructural features of natural tissues. A novel nanotechnological tool, electrospinning, permits the processing and modification of proper nanoscale biomaterials to enhance neural cell adhesion, migration, proliferation, differentiation, and subsequent nerve regeneration. The composite scaffold was prepared by combining 3D bioprinting with subsequent electrochemical deposition of polypyrrole and electrospinning of silk fibroin to form a composite polypyrrole/silk fibroin scaffold. Fourier transform infrared spectroscopy was used to analyze scaffold composition. The surface morphology of the scaffold was observed by light microscopy and scanning electron microscopy. A digital multimeter was used to measure the resistivity of prepared scaffolds. Light microscopy was applied to observe the surface morphology of scaffolds immersed in water or Dulbecco＇s Modified Eagle＇s Medium at 37℃ for 30 days to assess stability. Results showed characteristic peaks of polypyrrole and silk fibroin in the synthesized conductive polypyrrole/silk fibroin scaffold, as well as the structure of the electrospun nanofiber layer on the surface. The electrical conductivity was 1 × 10^-5–1 × 10^-3 S/cm, while stability was 66.67%. A 3-（4,5-dimethyl-2-thiazolyl）-2,5-diphenyl-2-H-tetrazolium bromide assay was employed to measure scaffold cytotoxicity in vitro. Fluorescence microscopy was used to observe Ed U-labeled Schwann cells to quantify cell proliferation. Immunohistochemistry was utilized to detect S100β immunoreactivity, while scanning electron microscopy was applied to observe the morphology of adherent Schwann cells. Results demonstrated that the polypyrrole/silk fibroin scaffo

关键词： nerve regeneration composite nanofiber scaffold three dimensional bioprinting electrospinning silk fibroin polypyrrole L929 cells conductivity Schwann cells biocompatibility nerve repair neural regeneration

Analytical Criteria for Local Activity of CNN with Two-port and Application to Biochemical Model

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International Journal of minerals,Metallurgy and Materials 2000年第4期14卷 305-314页

作者： Lequan min Na yu Applied Science School University of Science and Technology BeijingBeijing 100083China

The analytic criteria are presented for the local activity theory in two-port Cellular Neural Network (CNN) cells with three local state variables, and the application to a Biochemical Model CNN (BMCNN) is given for coupling in series of two enzymes whose prototype was studied by Decroly and Goldbeter. The bifurcation diagrams of the BMCNN's show that there does not exist a locally passive domain, and the computer simulation exhibited that convergent patterns, oscillatory patterns or chaotic patterns may emerge if the selected cell parameters are located in locally active unstable domains but nearby the edge of chaos domain. In particular, the coexistence of multiple oscillations was observed in the corresponding triple cell couples of the BMCNN's with the same initial conditions.

关键词： Cellular neural networks

Porous palladium phosphide nanotubes for formic acid electrooxidation

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Carbon Energy 2022年第3期4卷 283-293页

作者： Tian-jiao Wang yu-Chuan jiang jia-Wei He Fu-min Li yu Ding Pei Chen yu Chen School of Materials Science and Engineering Key Laboratory of Macromolecular Science of Shaanxi ProvinceKey Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyShaanxi Normal UniversityXi'anChina

The development of an efficient catalyst for formic acid electrocatalytic oxidation reaction(FAEOR)is of great significance to accelerate the commercial application of direct formic acid fuel cells(DFAFC).Herein,palladium phosphide(PdxPy)porous nanotubes(PNTs)with different phosphide content(i.e.,Pd3P and Pd5P2)are prepared by combining the self-template reduction method of dimethylglyoxime-Pd(II)complex nanorods and succedent phosphating *** the reduction process,the self-removal of the template and the continual inside-outside Ostwald ripening phenomenon are responsible for the generation of the one-dimensional hollow and porous *** the basis of the unique synthetic procedure and structural advantages,Pd3P PNTs with optimized phos phide content show outstanding electroactivity and stability for *** portantly,the strong electronic effect between Pd and P promotes the direct pathway of FAEOR and inhibits the occurrence of the formic acid decomposition reaction,which effectively enhances the FAEOR electroactivity of Pd3P *** view of the facial synthesis,excellent electroactivity,high stability,and unordinary selectivity,Pd3P PNTs have the potential to be an efficient anode electrocatalyst for DFAFC.

关键词： electronic effect formic acid oxidation reaction palladium phosphide porous nanotubes self-template method

Molecularly imprinted open porous membranes made from Pickering W/O HIPEs for selective adsorption and separation of methyl 4-hydroxybenzoate

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Chinese Chemical Letters 2015年第8期26卷 1036-1041页

作者： Hong-yu Luo min Zhang Nai-Chao Si min-jia Meng Li Yan Wen-Jing Zhu Chun-Xiang Li School of Material Science and Engineering Jiangsu University School of Chemistry & Chemical Engineering Jiangsu University School of Chemistry Jilin Normal University

In this study, novel molecularly imprinted open porous membranes（MIOPMs） were prepared using the Pickering HIPEs template method and molecular imprinting technology for selective adsorption and separation of methyl 4-hydroxybenzoate（M4HB）. The template M4 HB, functional monomers,crosslinker and plastifier 2-ethylhexyl acrylate（2-EHA） were contained in the oil phase. Hydrophobic silica nanoparticles（HNP-SiO2） were employed as a stabilizer to establish stable W/O Pickering HIPEs with nonionic surfactant sorbitantrioleate（Span 85）. The results of SEM and FTIR indicated that the optimal MIOPMs were prepared successfully and possessed open and interconnecting pores. Then, the MIOPMs were used as sorbents for M4 HB. The correlation coefficient（R^2） values for the Langmuir–Freundlich isotherm model and pseudo-second-order kinetic model fitting to the adsorption equilibrium and kinetic data respectively were all higher than 0.95. The maximum adsorption capacity and the time of rapid adsorption for MIOPM4 were 4.146 mg g^-1 and 100 min, respectively. In addition, the permeability separation factor of MIOPMs for M4 HB compared to a structurally related analog methyl2-hydroxybenzoate（M2HB） could reach 3.122.

关键词： template porous surfactant silica ethylhexyl stabilizer fitting pores imprinting structurally

Effect of Nb on corrosion behavior of inner bottom plate of cargo oil tankers

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Journal of Iron and Steel Research International 2019年第6期26卷 611-620页

作者： Xiang-yu Xu Long Tian yun Zhou ming-yu Sun Xue-min Wang Cheng-jia Shang R.D.K. Misra Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China Tianjin Long March Launch Vehicle Manufacturing Co. Ltd. Tianjin 300462 China Institute of Research of Iron and Steel (IRIS) Sha-steel Zhangjiagang 215625 Jiangsu China Center for Structural and Functional Materials Research and Innovation Department of Metallurgical and Materials Engineering University of Texas at El Paso El Paso TX 7996& USA

The effect of Nb on the corrosion resistance of steels in simulating an oil-corrosion environment was investigated by means of microstructure observation, electrochemical test, dissolved Nb content measurement and Nb segregation observation. The results show that the microstructure of the experimental steels is mainly ferrite with a little pearlite. The dissolved Nb contents of the experimental steels are 0.0235 and 0.0458 wt.%, respectively, while the undissolved Nb content is nearly the same. In addition to enhancing mechanical properties of the steel, dissolved Nb improves the corrosion resistance by enriching Nb in the rust layer. Nb oxides in the rust layer cause a decrease in the corrosion rate due to a decrease in the anodic reaction kinetics. The segregation of Nb at the grain boundaries suppresses the corrosion. Moreover, Nb is enriched at the bottom of the corrosion pit and prevents any further corrosion.

关键词： Low-alloy steel Acid corrosion Pitting corrosion Electrochemical impedance spectroscopy segregation