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Integration of spatial attractions between and within pixels for sub-pixel mapping

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Journal of Systems Engineering and Electronics 2012年第2期23卷 293-303页

作者： Qunming wang liguo wang Danfeng Liu College of Information and Communications Engineering Harbin Engineering UniversityHarbin 150001E R.China

As a promising technique to enhance the spatial reso- lution of remote sensing imagery, sub-pixel mapping is processed based on the spatial dependence theory with the assumption that the land cover is spatially dependent both within pixels and be- tween them. The spatial attraction is used as a tool to describe the dependence. First, the spatial attractions between pixels, sub- pixel/pixel spatial attraction model （SPSAM）, are described by the modified SPSAM （MSPSAM） that estimates the attractions accord- ing to the distribution of sub-pixels within neighboring pixels. Then a mixed spatial attraction model （MSAM） for sub-pixel mapping is proposed that integrates the spatial attractions both within pix- els and between them. According to the expression of the MSAM maximumising the spatial attraction, the genetic algorithm is em- ployed to search the optimum solution and generate the sub-pixel mapping results. Experiments show that compared with SPSAM, MSPSAM and pixel swapping algorithm modified by initialization from SPSAM （MPS）, MSAM can provide higher accuracy and more rational sub-pixel mapping results.

关键词： remote sensing imagery sub-pixel mapping mixed spatial attraction model (MSAM) genetic algorithm (GA).

Membrane protein reconstitution for functional and structural studies

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Science China(Life Sciences) 2015年第1期58卷 66-74页

作者： wang liguo TONGGU LiGe Department of Biological Structure University of Washington

Membrane proteins are involved in various critical biological processes,and studying membrane proteins represents a major challenge in protein *** shown by both structural and functional studies,the membrane environment plays an essential role for membrane *** vitro studies are reliant on the successful reconstitution of membrane *** review describes the interaction between detergents and lipids that aids the understanding of the reconstitution *** the techniques of detergent removal and a few useful techniques to refine the formed proteoliposomes are *** the applications of reconstitution techniques to study membrane proteins involved in Ca2+ signaling are summarized.

关键词： membrane protein reconstitution Ca2+ signaling Ca2+ mediators Ca2+-regulated enzymes Ca2+ transducers

A complementary integrated Transformer network for hyperspectral image classification

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CAAI Transactions on Intelligence Technology 2023年第4期8卷 1288-1307页

作者： Diling Liao Cuiping Shi liguo wang College of Communication and Electronic Engineering Qiqihar UniversityQiqiharChina College of Information and Communication Engineering Dalian Nationalities UniversityDalianChina

In the past,convolutional neural network(CNN)has become one of the most popular deep learning frameworks,and has been widely used in Hyperspectral image classification ***(Conv)in CNN uses filter weights to extract features in local receiving domain,and the weight parameters are shared globally,which more focus on the highfrequency information of the *** from Conv,Transformer can obtain the long‐term dependence between long‐distance features through modelling,and adaptively focus on different *** addition,Transformer is considered as a low‐pass filter,which more focuses on the low‐frequency information of the *** the complementary characteristics of Conv and Transformer,the two modes can be integrated for full feature *** addition,the most important image features correspond to the discrimination region,while the secondary image features represent important but easily ignored regions,which are also conducive to the classification of *** this study,a complementary integrated Transformer network(CITNet)for hyperspectral image classification is ***,three‐dimensional convolution(Conv3D)and two‐dimensional convolution(Conv2D)are utilised to extract the shallow semantic information of the *** order to enhance the secondary features,a channel Gaussian modulation attention module is proposed,which is embedded between Conv3D and *** module can not only enhance secondary features,but suppress the most important and least important ***,considering the different and complementary characteristics of Conv and Transformer,a complementary integrated Transformer module is ***,through a large number of experiments,this study evaluates the classification performance of CITNet and several state‐of‐the‐art networks on five common *** experimental results show that compared with these classification networks,CITNet can provide better classification performance.

关键词： complementary integrated Transformer module convolutional neural network Gaussian modulation Transformer

Microstructure, mechanical properties and deformation mechanisms of an as-cast Mg–Zn–Y–Nd–Zr alloy for stent applications

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Journal of Materials Science & Technology 2019年第7期35卷 1211-1217页

作者： Jianfeng wang Hongbo Zhou liguo wang Shijie Zhu Shaokang Guan School of Materials Science and Engineering Zhengzhou University

A new Mg-2Zn-0.2Y -0.5N d-0.4Zr (wt%) alloy designed specially for stent applications has been developed. The as-cast alloy is featured with equiaxed grains with a mean size of about 40 μm and a small am ount of second phase (T phase) distributed discontinuously either at the grain boundaries or inside the grains. This alloy exhibits a tensile elongation of up to 35%, which is much larger than that of most reported other as-cast Mg alloys. The tensile deform ation mechanisms have also been investigated. The results show that, besides basal slip,{10-12} extension twining and non-basal pyramidal slips can also be observed at initial stage and later stage during tensile deform ation, respectively, which are responsible for the good room -tem perature ductility.

关键词： Magnesium alloys Vascular stents Microstructure Mechanical properties Deformation mechanisms

Advances of drag-reducing surface technologies in turbulence based on boundary layer control

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Journal of Hydrodynamics 2015年第4期27卷 473-487页

作者： LUO Yuehao wang liguo GREEN Lork SONG Kenan wang Liang SMITH Robert School of Engineering and Applied Science The George Washington University Division of Electricity Department of Engineering Sciences Uppsala University School of Engineering Boston University Department of Mechanical and Industrial Engineering Northeastern University Department of Mechanical Engineering University of Colorado at Boulder College of Applied Sciences and Technology Ball State University

Our living environment is surrounded by turbulence, which is also a concern of the global energy consumption and the greenhouse gas emission, and the viscous force on the solid-liquid/solid-gas interface is an important part of the turbulence. Reducing friction force in turbulence to the greatest extent is becoming an urgent issue to be resolved at present. In this paper, the various state-of-the-art approaches of drag-reducing and energy-saving technologies based on the boundary layer control are reviewed, focusing on the polymer drag reduction additives, the micro-morphology, the super-hydrophobic surface, the micro air bubbles, the heating wall, the vibrant flexible wall and the composite drag reduction methods. In addition, the mechanisms of different drag reductions based on the boundary layer control and the potential applications in fluid engineering are discussed. This paper aims not only to contribute to a better understanding of drag reduction mechanisms, but also to offer new perspectives to improve the current drag-reducing and energy saving technologies.

关键词： fluid drag reduction hydrodynamics energy saving turbulent flowing boundary layer control

Ultrasound enhanced heterogeneous activation of peroxydisulfate by bimetallic Fe-Co/GAC catalyst for the degradation of Acid Orange 7 in water

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Journal of Environmental Sciences 2014年第6期26卷 1267-1273页

作者： Chun Cai liguo wang Hong Gao Liwei Hou Hui Zhang Department of Environmental Engineering Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University

Bimetallic Fe-Co/GAC （granular activated carbon） was prepared and used as heterogeneous catalyst in the ultrasound enhanced heterogeneous activation of peroxydisulfate （PS, S2O8 2-） process. The effect of initial pH, PS concentration, catalyst addition and stirring rate on the decolorization of Acid Orange 7 （AO7） was investigated. The results showed that the decolorization efficiency increased with an increase in PS concentration from 0.3 to 0.5 g/L and an increase in catalyst amount from 0.5 to 0.8 g/L. But further increase in PS concentration and catalyst addition would result in an unpronounced increase in decolorization efficiency. In the range of 300 to 900 r/min, stirring rate had little effect on AO7 decolorization. The catalyst stability was evaluated by measuring decolorization efficiency for four successive cycles.

关键词： Fe-Co/GAC ultrasound heterogeneous catalysis peroxydisulfate sulfate radicals

A multi-functional MgF_(2)/polydopamine/hyaluronan-astaxanthin coating on the biodegradable ZE21B alloy with better corrosion resistance and biocompatibility for cardiovascular application

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Journal of Magnesium and Alloys 2024年第3期12卷 1102-1116页

作者： Yachen Hou Xueqi Zhang Jingan Li liguo wang Shaokang Guan School of Materials Science and Engineering and Henan Key Laboratory of Advanced Magnesium Alloy and Key Laboratory of Materials Processing and Mold Technology(Ministry of Education) Zhengzhou UniversityZhengzhou 450001China

The cardiovascular diseases(CVD)continue to be the major threat to global public health over the years,while one of the effective methods to treat CVD is stent *** magnesium(Mg)alloys have great potential applications in cardiovascular stents benefit from their excellent biodegradability and ***,excessive degradation rate and the delayed surface endothelialization still limit their further *** this study,we modified a Mg-Zn-Y-Nd alloy(ZE21B)by preparing MgF_(2) as the corrosion resistance layer,the dopamine polymer film(PDA)as the bonding layer,and hyaluronic acid(HA)loaded astaxanthin(ASTA)as an important layer to directing the cardiovascular cells *** electrochemical test results showed that the MgF_(2)/PDA/HA-ASTA coating improved the corrosion resistance of *** cytocompatibility experiments also demonstrated that this novel composite coating also selectively promoted endothelial cells proliferation,inhibited hyperproliferation of smooth muscle cells and adhesion of *** with the HAloaded rapamycin(RAPA)coating,our MgF_(2)/PDA/HA-ASTA coating showed better blood compatibility and cytocompatibility,indicating stronger multi-functions for the ZE21B alloy on cardiovascular application.

关键词： Biodegradable ZE21B alloy Reendothelialization Surface modification Hyaluronic acid Astaxanthin.

A novel ceria hollow nanosphere catalyst for low temperature NOx storage

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Journal of Rare Earths 2022年第4期40卷 626-635,I0004页

作者： Wenxu Liu Huiming Cao Zhongpeng wang Chenchen Cui Liangran Gan Wei Liu liguo wang School of Water Conservancy and Environment University of JinanJinan 250022China Shandong Provincial Eco-environment Monitoring Center Jinan 250101China

In this work,a highly active CeO_(2) catalyst with hollow nanosphere morphology for low temperature NO_(x) storage was prepared by a surfactant-assisted solvothermal *** physicochemical properties of ceria samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),N_(2) adsorption–desorption,H_(2)-temperature programmed reduction(H_(2)-TPR),X-ray photoelectron spectroscopy(XPS)and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS).The as-prepared CeO_(2) nanosphere possesses excellent NO oxidation capacity,smaller mesopores,better reducibility and more surface Ce^(3+)*** with CeO_(2) with nanorod and nanoparticle morphologies,CeO_(2) nanosphere shows better intrinsic low temperature NO_(x) trapping performance,with a wide operating temperature window(150–300℃),high NO_(x) adsorption capacity(NAC,640–745μmol/g)and high NO_(x) storage capacity(NSC,250–350μmol/g).Two reaction pathways are speculated for NO_(x) adsorption on CeO_(2) nanosphere,including“nitrate route”and“nitrite route”.The thermally unstable surface nitrites formed on the CeO_(2) nanosphere allow ceria to release more NO_(x) during the desorption *** present work provides a new ceria morphology for NO_(x) traps,which may become a potential excellent NO_(x) storage material.

关键词： Ceria Nanosphere NO_(x)storage Low temperature DRIFTS Rare earths

Dynamics of dense spin ensemble excited in a barrier layer and detected in a well

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Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1108-1111页

作者： SHEN Chao wang liguo ZHU Hui ZHENG HouZhi State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesP.O.Box 912Beijing 100083China

Photoluminescence (PL) polarization of a spin ensemble was examined over a wide excitation wavelength range from 520 nm to 700 nm and a temperature range from 3.5 K to 300 K after it transfers from a (AlGa)As barrier layer and eventually quenches irradiatively in a GaAs quantum well (QW).A highest PL circular polarization of 30% can be kept at temperatures up to 120 K,while its room temperature value reaches about 17%.It is found that the main features of the optical spin orientation in bulk Al 0.27 Ga 0.73 As materials can be reproduced in terms of the wavelength dependence of PL polarization degree,as the spin polarized ensemble transfers and relaxes into GaAs *** transient of PL polarization degree also indicates that a dense spin ensemble collected from the barrier region is in favor of conserving its polarization in GaAs QW as evidenced by a rising temporal response.

关键词： spin polarized transport optical orientation dense spin relaxation quantum well