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Comparison of C- and L-band simulated compact polarized SAR in oil spill detection

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Frontiers of Earth Science 2019年第2期13卷 351-360页

作者： Xiaochen WANG yun SHAO fengli ZHANG Wei TIAN Laboratory of Target Microwave Properties Deqing Academy of Satellite ApplicationsHuzhou 313200China Institute of Remote Sensing and Digital Earth Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

This paper presents the compact polarized (CP) pseudo quad-pol parameters for the detection of marine oil spills and segregation of lookalikes using simulated CP SAR data from full-polarized (FP) SAR *** to the CP theory,11 polarized parameters generally used for the detection of oil spills were derived from reconstructed pseudo quad-pol data for both C and L *** addition,the reconstruction performance between C and L bands was also compared by evaluating the reconstruction accuracy of retrieved polarized *** results show that apart from(thv and RH,other polarized parameters of σHH,σVV,H,α,φH-V,r,ρH-V,and γ can be reconstructed with satisfactory accuracy for both C and L ***,C band has a higher reconstruction accuracy than L band,especially for φ***,the effect of reconstruction of polarized parameters on oil spill classification was also evaluated using the maximum likelihood classification (MLC) *** to the evaluation of kappa coefficients and mapping accuracy,it is recommended to use σHH,σVV,H,ρH-V,and γ of the C band CP SAR for marine oil spill classification.

关键词： compact polarized reconstruction oil spill classification

Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang yuefeng Yan Zhen Wang Guansheng Ma Dechang Jia Xiaoxiao Huang yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching

Preparation of a New Polyoxometalate-based Nanoparticles

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Chinese Chemical Letters 2004年第6期15卷 714-716页

作者： XiaoHongWANG fengli JingFuLIU M.T.POPE DepartmentofChemistry NortheastNormalUniversityChangchtm130024 DepartmentofChemistry GeorgetownUniversityWashingtonDC20057-1227U.S.A

Polyoxometalates (POMs) α-K8 H6 [Si2W18Ti6O77] (Si2W18Ti6) loaded starch nanop-articles have been prepared and structurally characterized by elemental analyses, IR spectra and 29Si spectroscopy. The particle size of Si2W18Ti6 /starch was estimated by a Transmission electron microscope (TEM) and a 1000HSA MALVIRN Zetasizer instrument. The result shows that the polyoxometalate retained the parent structure after encapsulated by starch microspheres.

关键词： Polyoxometalate nanoparticle synthesis.

Dip2a regulates stress susceptibility in the basolateral amygdala

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Neural Regeneration Research 2025年第6期20卷 1735-1748页

作者： Jing Li Zixuan He Weitai Chai Meng Tian Huali yu Xiaoxiao He Xiaojuan Zhu Key Laboratory of Molecular Epigenetics Ministry of Education Institute of Genetics and CytologyNortheast Normal UniversityChangchunJilin ProvinceChina

Dysregulation of neurotransmitter metabolism in the central nervous system contributes to mood disorders such as depression, anxiety, and post–traumatic stress disorder. Monoamines and amino acids are important types of neurotransmitters. Our previous results have shown that disco-interacting protein 2 homolog A(Dip2a) knockout mice exhibit brain development disorders and abnormal amino acid metabolism in serum. This suggests that DIP2A is involved in the metabolism of amino acid–associated neurotransmitters. Therefore, we performed targeted neurotransmitter metabolomics analysis and found that Dip2a deficiency caused abnormal metabolism of tryptophan and thyroxine in the basolateral amygdala and medial prefrontal cortex. In addition, acute restraint stress induced a decrease in 5-hydroxytryptamine in the basolateral amygdala. Additionally, Dip2a was abundantly expressed in excitatory neurons of the basolateral amygdala, and deletion of Dip2a in these neurons resulted in hopelessness-like behavior in the tail suspension test. Altogether, these findings demonstrate that DIP2A in the basolateral amygdala may be involved in the regulation of stress susceptibility. This provides critical evidence implicating a role of DIP2A in affective disorders.

关键词： 5-hydroxytryptamine acute restraint stress basolateral amygdala CaMKII neurons DIP2A metabolomics neurotransmitters principal component analysis stress susceptibility tryptophan

Optimization Strategies of Na_(3)V_(2)(PO_(4))_(3) Cathode Materials for Sodium‑Ion Batteries

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Nano-Micro Letters 2025年第2期17卷 204-251页

作者： Jiawen Hu Xinwei Li Qianqian Liang Li Xu Changsheng Ding yu Liu Yanfeng Gao School of Materials Science and Engineering Shanghai UniversityShanghai 200444People’s Republic of China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050People’s Republic of China

Na_(3)V_(2)(PO_(4))_(3)(NVP)has garnered great attentions as a prospective cathode material for sodium-ion batteries(SIBs)by virtue of its decent theoretical capacity,superior ion conductivity and high structural ***,the inherently poor electronic conductivity and sluggish sodium-ion diffusion kinetics of NVP material give rise to inferior rate performance and unsatisfactory energy density,which strictly confine its further application in ***,it is of significance to boost the sodium storage performance of NVP cathode *** to now,many methods have been developed to optimize the electrochemical performance of NVP cathode *** this review,the latest advances in optimization strategies for improving the electrochemical performance of NVP cathode material are well summarized and discussed,including carbon coating or modification,foreign-ion doping or substitution and nanostructure and morphology *** foreign-ion doping or substitution is highlighted,involving Na,V,and PO_(4)^(3−)sites,which include single-site doping,multiple-site doping,single-ion doping,multiple-ion doping and so ***,the challenges and prospects of high-performance NVP cathode material are also put *** is believed that this review can provide a useful reference for designing and developing high-performance NVP cathode material toward the large-scale application in SIBs.

关键词： Sodium-ion batteries Na_(3)V_(2)(PO_(4))_(3) Cathode materials Electrochemical performance Optimization strategies

The weight distributions of a class of non-primitive cyclic codes with two nonzeros

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Science China Mathematics 2015年第6期58卷 1285-1296页

作者： ZHENG DaBin ZHOU fengli HU Lei ZENG XiangYong Faculty of Mathematics and Statistics Hubei University State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences Beijing Center for Mathematics and Information Interdisciplinary Sciences

Recently, a class of non-primitive cyclic codes with two nonzeros have received much attention of researchers and their weight distributions have been obtained for several cases of two key parameters related to the nonzeros. In this paper, by evaluating certain Jacobi sums, we determine the weight distributions of this class of cyclic codes for one more special case.

关键词： primitive codes Jacobi multiplicative evaluating integer multiplicity exponential simplify details

Temperature field analysis and its application in hot continuous rolling of Inconel 718 superalloy

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Acta Metallurgica Sinica(English Letters) 2009年第2期22卷 81-90页

作者： fengli SUI Liqing CHEN Xianghua LIU Lintao WANG Wei LI State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China R＆D Center Special Steel Branch Baoshan Iron and Steel Co. Ltd. Shanghai 200940 China

A coupled thermo-mechanical model containing metal flow and temperature field for calculating temperature variation has been developed on fourteen-pass hot continuous rolling of round rod for Inconel 718 alloy using 3D elastic-plastic finite element method （FEM）. The temperature of characteristic analysis points in the intermediate cross-section of the workpiece has been simulated at initial temperature ranging from 960 to 1000 ℃ and initial velocity in range of 0.15-0.55 m·s^-1. Based on finite element analysis and microstructural observation in cylindrical hot compression experiments, the appropriate hot continuous rolling technologies have been designed for rod products with different diameters. For a real rolling practice, the simulated surface temperature was examined and is in good agreement with the measured one.

关键词： Hot continuous rolling Elastic-plastic finite element method(FEM) Coupled analysis Temperature field Inconel 718

Experimental Investigation on the Hydrodynamic Characteristics of Fluidized Bed Particle Solar Receiver with Gas-Solid Countercurrent Flow Pattern

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Journal of Thermal Science 2021年第6期30卷 2241-2253页

作者： JIANG Kaijun WANG fengli KONG Yanqiang XU Chao DU Xiaoze MOE Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power UniversityBeijing 102206China School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China

To design a particle solar receiver(PSR),a vital energy conversion system,is still a bottleneck for *** study presents a novel PSR based on countercurrent fluidized bed(CCFB)technology,named CCFB *** this design,downward-moving particles are subjected to the action of an up-flow gas to reduce the falling speed and enhance the radial disturbance,and hence increase the residence time of particles and improve the heat transfer.A cold-mold visual experimental setup is *** influence factors are investigated experimentally,including the superficial gas velocity,solid flux,aeration gas,particle size and transport tube *** results indicate that the maximum solid holdup can exceed 9%or so with fine particles of diameter d_(p)=113.5 μm and a tube diameter of 40 *** is proved that the CCFB can operate stably and adjust the solid flux *** results of this study provide a new structure for PSRs in the concentrated solar power field and could fill the research insufficiency in the gas-solid counterflow field.

关键词： particle solar receiver gas-solid two-phase flow countercurrent fluidized bed solid holdup

Synthesis of Visible-Light-Driven g-C3N4/PPy/Ag Ternary Photocatalyst with Improved Photocatalytic Performance

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Chinese Journal of Chemistry 2017年第2期35卷 226-236页

作者： fengli Zhang Fang Duan Zhigang Ding Mingqing Chen School of Chemical and Material Engineering Jiangnan University Wuxi Jiangsu 214122 China The Key Laboratory of Food Colloids and Biotechnology Ministry of Education Jiangnan University Wuxi Jiangsu 214122 China

g-C3N4/PPy/Ag ternary photocatalyst was synthesized by a three-step method. Firstly, graphitic carbon nitride （g-C3N4） photocatalyst was obtained by sintering melamine at high temperature, then a series ofg-C3N4/PPy com- posite photocatalysts were prepared by in-situ polymerization of pyrrole, and finally the g-C3N4/PPy/Ag ternary composite photocatalyst was obtained by depositing Ag on the surface of g-C3N4/PPy. The photocatalytic activities of as-prepared samples were evaluated by degradation of antibiotic tetracycline （TC） under visible light. The influ- ence of the amounts of polypyrrole （PPy） and Ag on the photocatalytic activity of g-C3N4/PPy/Ag ternary photo- catalyst was investigated. Both PPy and Ag played critical roles for the enhanced photocatalytic activity of g-C3N4/PPy/Ag. The g-C3N4/PPy/Ag composites exhibited remarkably improved photocatalytic activities for de- grading TC compared with g-C3N4, g-C3N4/PPy and g-C3N4/Ag. Besides, the photocatalytic mechanism was also analyzed. The band match of PPy with g-C3N4 benefited the separation of photo-generated carriers in g-C3N4, and the deposited Ag nanoparticles played important roles as an electron mediator due to the surface plasmon resonance （SPR） effects. The present study offered new insight into the design of the economical and gently environ- ment-friendly synthesis of highly efficient photocatalysts.

关键词： g-C3N4 polypyrrole Ag visible light photocatalyst