1 Introduction In this letter,we consider the problem of recovering an unknown sparse signal from its few measurements when part of the support prior of the desired signal is available.This problem naturally raises fr...1 Introduction In this letter,we consider the problem of recovering an unknown sparse signal from its few measurements when part of the support prior of the desired signal is available.This problem naturally raises from the compressed sensing(CS),which was proposed by Candès et al.[1]around 2006.Since then,CS has rapidly developed,see,e.g.,[2–5].展开更多
Dear Editor,Avian influenza A （H9N2） virus plays a crucial role in interspecies transmission between animals and humans due to its wide host range, adaptation in mammals and the diversified gene reassortments. Since...Dear Editor,Avian influenza A （H9N2） virus plays a crucial role in interspecies transmission between animals and humans due to its wide host range, adaptation in mammals and the diversified gene reassortments. Since 1990s, two lineages of H9N2 virus.展开更多
In this work,lithium(Li)-aluminum(Al)layered double hydroxide(LDH)films modified by 4-amino-2-((hydrazine methylene)amino)-4-oxobutanoic acid(denoted as AOA acid)and/or 1H,1H,2H,2H-perfluorooctyltriethoxysilane were p...In this work,lithium(Li)-aluminum(Al)layered double hydroxide(LDH)films modified by 4-amino-2-((hydrazine methylene)amino)-4-oxobutanoic acid(denoted as AOA acid)and/or 1H,1H,2H,2H-perfluorooctyltriethoxysilane were prepared on 6N01 Al alloy by a facile,in-situ growth method with enhanced hydrophobicity,anti-biofouling and anti-corrosion performance.The preparation is low energy consumptive and environment friendly,relying on self-assembly at ambient temperature.The structure,molecular weight and functional groups of the synthesized AOA acid were characterized by NMR spectrometer,ESI-MS spectrometer and Fourier transform infrared(FT-IR)spectroscopy.And the compositions,structure and morphology of the films were characterized by Fourier transform infrared(FT-IR)spectroscopy,glancing-angle X-ray diffraction(GA-XRD),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM)and energy-dispersive x-ray spectrum(EDS).Water contact angle measurements(CA)and atomic force microscopy(AFM)characterization show that the films possess a micro/nanostructure with an improved hydrophobicity.Immersion test,neutral salt tests(NSS)and electrochemical impedance spectroscopy(EIS)conducted in 3.5 wt.%NaCl solutions demonstrate the improved corrosion resistance of the films over bare Al alloy.Meanwhile,the films also possess an excellent anti-bacterial property toEscherichia coli,Bacillus subtilis and sulfate-reducing bacteria.展开更多
基金supported by the project of the Natural Science of Ningxia(Nos.2022AAC03642,2020AAC03254)the Southwest University Training Program of Innovation and Entrepreneurship for Undergraduates(No.X202210635563)。
文摘1 Introduction In this letter,we consider the problem of recovering an unknown sparse signal from its few measurements when part of the support prior of the desired signal is available.This problem naturally raises from the compressed sensing(CS),which was proposed by Candès et al.[1]around 2006.Since then,CS has rapidly developed,see,e.g.,[2–5].
基金supported by the National Natural Science Foundation of China-Youth Scientist Program (Epidemiological spatial-temporal dynamics of H1N1 influenza virus in a climatologically diverse region, 81502856)
文摘Dear Editor,Avian influenza A （H9N2） virus plays a crucial role in interspecies transmission between animals and humans due to its wide host range, adaptation in mammals and the diversified gene reassortments. Since 1990s, two lineages of H9N2 virus.
基金The work was financially supported by the National Natural Science Foundation of China(No.51871097)China Scholarship Council(No.201906130085)+7 种基金the National Natural Science Foundation of Hunan Province,China(No.2019JJ40033)the Key-Area Research and Development Program of Guangdong Province,China(No.2020B010186001)the Major Special Foundation of Research and Innovation of Qiannan Normal University for Nationalities,China(No.QNSY2018XK005)the Construction Project of Novel Catalysis Materials Development and Engineering Research Center for Guizhou General College(Guizhou“KY”[2015]342)Guangzhou Goal and Energy Conservation Tech.Co.Ltd.China Petroleum and Chemical CorporationSinopec Beijing Research Institute of Chemical Industrythe University of Calgary。
文摘In this work,lithium(Li)-aluminum(Al)layered double hydroxide(LDH)films modified by 4-amino-2-((hydrazine methylene)amino)-4-oxobutanoic acid(denoted as AOA acid)and/or 1H,1H,2H,2H-perfluorooctyltriethoxysilane were prepared on 6N01 Al alloy by a facile,in-situ growth method with enhanced hydrophobicity,anti-biofouling and anti-corrosion performance.The preparation is low energy consumptive and environment friendly,relying on self-assembly at ambient temperature.The structure,molecular weight and functional groups of the synthesized AOA acid were characterized by NMR spectrometer,ESI-MS spectrometer and Fourier transform infrared(FT-IR)spectroscopy.And the compositions,structure and morphology of the films were characterized by Fourier transform infrared(FT-IR)spectroscopy,glancing-angle X-ray diffraction(GA-XRD),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM)and energy-dispersive x-ray spectrum(EDS).Water contact angle measurements(CA)and atomic force microscopy(AFM)characterization show that the films possess a micro/nanostructure with an improved hydrophobicity.Immersion test,neutral salt tests(NSS)and electrochemical impedance spectroscopy(EIS)conducted in 3.5 wt.%NaCl solutions demonstrate the improved corrosion resistance of the films over bare Al alloy.Meanwhile,the films also possess an excellent anti-bacterial property toEscherichia coli,Bacillus subtilis and sulfate-reducing bacteria.
