检索结果-南通市图书馆

Novel infrared and visible image fusion method based on independent component analysis

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2014年第2期8卷 243-254页

作者： Yin LU fuxiang WANG Xiaoyan LUO Feng liu National Key Laboratory of CNS/ATM School of Electronics and Information Engineering Beihang University Beijing 100191 China

The goal of infrared （IR） and visible image fu- sion is for the fused image to contain IR object features from the IR image and retain the visual details provided by the visible image. The disadvantage of traditional fusion method based on independent component analysis （ICA） is that the primary feature information that describes the IR objects and the secondary feature information in the IR image are fused into the fused image. Secondary feature information can de- press the visual effect of the fused image. A novel ICA-based IR and visible image fusion scheme is proposed in this paper. ICA is employed to extract features from the infrared image, and then the primary and secondary features are distinguished by the kurtosis information of the ICA base coefficients. The secondary features of the IR image are discarded during fu- sion. The fused image is obtained by fusing primary features into the visible image. Experimental results show that the pro- posed method can provide better perception effect.

关键词： image fusion independent component analysis(ICA) feature extraction kurtosis

Species,engineering and characterizations of defects in TiO2-basedphotocatalyst

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第5期29卷 671-680页

作者： Beibei Dong Taifeng liu Can Li fuxiang Zhang State Key Laboratory of Catalysis 2011-iChEM Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Dalian 116023 China university of Chinese Academy of Sciences Beijing 100049 China National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Collaborative Innovation Center of Nano FunctionalMaterials and Applications of Henan Province Henan University Kaifeng 475004 China

Light absorption, charge separation and surface reaction are considered as the main processes ofphotocatalysis on one semiconductor, and all of them are demonstrated to be related to the defect statesof photocatalysts. This paper will choose Ti02 as model photocatalyst to introduce some basic conceptsand strategies related to defects and methods developed to characterize defects in the past ***, such strategies as hydrogenation and metal/nonmetal doping intoTi02 will be introduced toextend utilization of solar spectrum and/or to provide active sites. On the contrary, the unfavorable effectof defects such as acting as recombination centers of photogenerated carriers will also be *** typical methods to characterize the properties of defects are summarized, which contain electronparamagnetic resonance （EPR）, photoluminescence technique （PL）, positron annihilation spectroscopy（PAS）, and so on. We do hope that this review will make a revealing effect on understanding to thefunctions of defects as well as construction of efficient photocatalytic systems in the future.

关键词： Titanium dioxide Defect engineering Photocatalysis Water splitting Environmental purification

Matrix calculation of high-dimensional cross product and its application in automatic recognition of the endmembers of hyperspectral imagary

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2011年第1期54卷 197-203页

作者： GENG XiuRui1,ZHAO YongChao1,liu SuHong2 & WANG fuxiang3 1Key Laboratory of Technology in Geo-spatial Information Processing and Application System, Institute of Electronics,Chinese Academy of Sciences,beijing 100080,China 2State Key Laboratory of Remote Sensing Science,Jointly Sponsored by beijing Normal university and the Institute of Remote Sensing Applications of Chinese Academy of Sciences, School of Geography,beijing Normal university,beijing 100875,China 3School of Electronics and Information Engineering,Beihang university,beijing 100191,China 1. Key Laboratory of Technology in Geo-spatial Information Processing and Application System Institute of Electronics Chinese Academy of Sciences Beijing 100080 China2. State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences School of Geography Beijing Normal University Beijing 100875 China3. School of Electronics and Information Engineering Beihang University Beijing 100191 China

This paper gives the definition of the high-dimensional cross product and its calculation by extending the 3-D cross product definition into the high-dimensional vector *** on the properties of the cross product,the volume variance index(VVI)is proposed to be used in extracting automatically the endmembers of the hypherspectral imagery which eliminates the shortcoming of the traditional method of using simplex only where the extraction results were easily impacted by the abnormal pixels.A case study of endmembers extraction experiment using the VVI method with the AVIRIS data for Cuprite has shown a very good result.

关键词： endmember simplex hyperspectral imagery cross product

Efficient removal and upcycling of pollutants in wastewater:a strategy for reconciling environmental pollution and resource depletion crisis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第11期18卷 359-362页

作者： Lei Bi Qiong Wang Jingzhang liu fuxiang Cui Maoyong Song Key Laboratory of Environmental Nanotechnology and health Effects Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China university of Chinese Academy of Sciences Beijing 100049China

Due to the relentless exploitation of non-renewable resources,humanity is faced with a resource depletion crisis in the coming decades and serious environmental *** efficient removal and upcycling of pollutants(ERUP)may become a potential strategy to address these ***,characterized by its large production volume and fluidity,can easily cause widespread environmental pollution through natural water *** to solubility constraints,pollutants in wastewater typically exhibit low concentrations and complex compositions,thereby impeding effective ***,achieving ERUP in wastewater is both highly significant and extremely *** conventional wastewater treatment strategies that are focused on removing pollutants,ERUP strategies can not only realize the efficient removal of pollutants from water but also convert pollutants into valuable and functional ***,we enumerated the latest research progress on ERUP in wastewater and highlighted studies that demonstrate the simultaneous achievement of pollutant removal and the direct conversion of these contaminants into high-efficiency catalysts,hydrogen energy,electrical energy,and other high-value ***,we identified the problems and challenges in the development of ERUP in wastewater and outlined potential research directions for future studies.

关键词： environmental pollution resource depletion upcycling wastewater pollutants

One dimensional nickel phosphide polymorphic heterostructure as carbon-free functional support loading single-atom iridium for promoted electrocatalytic water oxidation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第4期79卷 410-417页

作者： Rashid Mehmood Guifa Long Wenjun Fan Mingrun Li Lifang liu fuxiang Zhang StateKey Laboratory of Catalysis iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian National Laboratory for Clean EnergyDalian 116023LiaoningChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China GuangxiKey Laboratory of Chemistry and Engineering of Forest Products School of Chemistry and Chemical EngineeringGuangxi Minzu UniversityNanning 530008GuangxiChina

Although conducting materials such as carbon nanotube and carbon fiber paper(CFP)have been extensively employed as support of electrocatalytic active sites,most of them are of poor catalytic functionality by themselves and undesirable stability during strong acid/alkaline environments or oxidation *** we report a novel one-dimensional(1D)nickel phosphide polymorphic heterostructure(denoted as NPPH)to work as one effective carbon-free functional support for loading of single-atom Ir water oxidation ***,the NPPH composed of both Ni12P5and Ni2P phases is not only active for robust alkaline water oxidation but also is of good stability and hydrophilicity for favorable loading of single-atom dispersed *** NPPH supported single-atom Ir electrocatalyst(Ir/NPPH)is found to exhibit remarkably superior water oxidation activity with respect to the NPPH itself or CFP supported single-atom Ir catalyst(Ir/CFP),demonstrating the synergetic promotion effect between NPPH and single-atom Ir ***,the NPPH supported single-atom Ir catalyst can bear alkaline water oxidation for over 120 h at current density of 50 mA cm^(-2).The NPPH developed here is expected as functional support to composite with other water oxidation catalysts,as may be an alternative strategy of developing highly efficient carbon-free electrocatalysts.

关键词： Oxygen evolution reaction Single atom catalyst Nickel phosphide heterostructure One-dimensional

Operation of the CSNS Penning surface H^- ion source

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 245-248页

作者： WU XiaoBing OUYANG HuaFu CHI YunLong he Wei HUANG Tao LI Gang liu YingMan LU YanHua XU TaoGuang ZHANG JunSong ZHANG HuaShun ZHAO fuxiang Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Graduate university of Chinese Academy of Sciences Beijing 100049China

The accelerator complex of the China Spallation Neutron Source (CSNS) consists of a H- linear accelerator (linac) and a rapid cycling synchrotron (RCS). The linac contains a Penning surface H- ion source. The designed energy and the beam current of the source are 50 keV and 20 mA respectively, with a normalized root mean square (norm. rms.) emittance of 0.2π mm mrad. The manufactures and tests of the discharge chamber are in great progress. The construction of H- ion source test stand has been completed, and the operation of the source is also in progress. Stable H- ion beams with energy of 50 keV and current up to 50 mA are attained. Emittance measurement for the H- beam is being prepared.

关键词： CSNS Penning H- ion source discharge chamber current emittance

Water-stable Mn-based MOF nanosheet as robust visible-light-responsive photocatalyst in aqueous solution

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2020年第12期63卷 1756-1760页

作者： Yejun Xiao Xiangyang Guo Tongtong Yang Junxue liu Xuan liu Yu Xiao Lifang liu Taifeng liu Sheng Ye Jun Jiang fuxiang Zhang Can Li State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energythe Collaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China hefei National Laboratory for Physical Sciences at the Microscale CAS Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Molecular Reaction Dynamics the Collaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalin 116023China university of Chinese Academy of Sciences Beijing 100049China National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Collaborative Innovation Center of Nano Functional Materials and Applications of Henan ProvinceHenan UniversityKaifeng 475000China

Development of visible-light-responsive metal-organic frameworks(MOFs) for promising solar energy conversion has inspired continuous interest, but it still suffers from poor stability especially in aqueous solution and/or under photoirradiation due to their relatively labile coordination bonds. herein, a new synthesized layered Mn-based MOF(Mn-TBAPy-BK) and its exfoliated twodemensional nanosheets(Mn-TBAPy-NS) are revealed to be highly stable no matter in aqueous solution with wide p H region or under visible light irradiation. As expected, the exfoliated Mn-TBAPy-NS exhibits enhanced surface area, shortened charge transfer distance, and superior charge separation with respect to the bulk one. Moreover, the as-obtained nanosheets can be employed as effective building block for nanocomposite and heterostructure assembly to further promote charge separation as well as solar hydrogen production from aqueous solution under visible light. The finding of water stable MOF nanosheet under visible light demonstrates its promising future for solar energy conversion.

关键词： metal-organic framework nanosheet water stable photocatalyst nanocomposite

Total pollution effect of urban surface runoff

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第9期21卷 1186-1193页

作者： LUO Hongbing LUO Lin HUANG Gu liu Ping LI Jingxian HU Sheng WANG fuxiang XU Rui HUANG Xiaoxue State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China College of Urban and Rural Construction Sichuan Agricultural University Du Jiangyan 611830 China. China Urban Construction Design & Research Institute Beijing 100029 China Suzhou university of Science and Technology Suzhou 215011 China

For pollution research with regard to urban surface runoff, most sampling strategies to date have focused on differences in land usage. With single land-use sampling, total surface runoff pollution effect cannot be evaluated unless every land usage spot is monitored. Through a new sampling strategy known as mixed stormwater sampling for a street community at discharge outlet adjacent to river, this study assessed the total urban surface runoff pollution effect caused by a variety of land uses and the pollutants washed off from the rain pipe system in the Futian River watershed in Shenzhen City of China. The water quality monitoring indices were COD （chemical oxygen demand）, TSS （total suspend solid）, TP （total phosphorus）, TN （total nitrogen） and BOD （biochemical oxygen demand）. The sums of total pollution loads discharged into the river for the four indices of COD, TSS, TN, and TP over all seven rainfall events were very different. The mathematical model for simulating total pollution loads was established from discharge outlet mixed stormwater sampling of total pollution loads on the basis of four parameters： rainfall intensity, total land area, impervious land area, and pervious land area. In order to treat surface runoff pollution, the values of MFF30 （mass first flush ratio） and FF30 （first 30% of runoff volume） can be considered as split-flow control criteria to obtain more effective and economical design of structural BMPs （best management practices） facilities.

关键词： total pollution effect mixed stormwater sampling street community pollution loads split-out flow control

Tip-induced directional charge separation on one-dimensional BiVO4 nanocones for asymmetric light absorption

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第9期31卷 326-332,I0009页

作者： Nengcong Yang Ruotian Chen Chenwei Ni Dongfeng Li Qi Sun Lifang liu Yu Qi Shengye Jin Xiuli Wang Fengtao Fan Can Li fuxiang Zhang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsDalian National Laboratory for Clean EnergyChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina university of Chinese Academy of Sciences Beijing 100049China

One dimensional(1D)semiconductor is a class of extensively attractive materials for many emerging solar energy conversion ***,it is still of shortage to assess the impact of 1D structural symmetry on spatial charge separation and understand its underlying *** we take controllably-synthesized 1D BiVO_(4)nanocones and nanorods as prototypes to study the influence of 1D symmetry on charge *** is found that the asymmetric BiVO_(4)nanocones enable more effective charge separation compared with the symmetric *** unexpected spatial charge separation on the nanocones is mainly ascribed to uneven light absorption induced diffusion-controllable charge separation due to symmetry breaking of 1D nanostructure,as evidenced by spatial and temporal resolved ***,the promotion effect of charge separation on the nanocones was quantitatively evaluated to be over 20 times higher than that in BiVO_(4)*** work gives the first demonstration of the influence of 1D structural symmetry on the charge separation behavior,providing new insights to design and fabricate semiconductor materials for efficient solar energy conversion.

关键词： Charge separation Tip-enhanced light absorption Surface photovoltage BiVO4 Photocatalysis