Super strength and toughness,excellent deformation resistance,and high-temperature service performance are the key factors to determine the practical application of new thermal barrier coatings(TBCs).The limited mobil...Super strength and toughness,excellent deformation resistance,and high-temperature service performance are the key factors to determine the practical application of new thermal barrier coatings(TBCs).The limited mobility of dislocations and the internal inherent defects in ceramics will inevitably lead to the decline of strength–plasticity and the reduction of service performance.Introducing preexisting twin boundaries and stacking faults(SFs)or preparing ceramic materials with high configuration entropy has demonstrated to be an effective strategy for enhancing the mechanical properties of ceramics.However,due to the positive thermal expansion coefficient of most ceramics and the remarkable increase of structural disorder at elevated temperature,the problem of elastic softening has become a bottleneck restricting the high-temperature service life of new TBCs.In this paper,the deformation behavior of high configuration entropy Zr6Ta2O17 ceramics at 25 to 1,200°C was in situ monitored via digital image correlation technique and three-point bending test platform in high-temperature environment.A remarkable Elinvar-like effect appears in the Zr_(6)Ta_(2)O_(17) ceramic.More interestingly,mechanical deformation dominates the severe lattice distortion(deformation twins,SFs)and the disorder–order transition of chemical order at the atomic scale,while temperature can further enhance the degree of lattice distortion and ordering of Zr6Ta2O17 ceramics.Furthermore,the atomic fluctuations at high temperature promotes the comprehensive improvement of mechanical properties in the Zr6Ta2O17 ceramics.展开更多
The pivotal role of N^(6)-methyladenosine(m^(6)A)demethylases in regulating plant stress responses has been widely explored;however,the function of apple m^(6)A demethylases under heat stress and fixed-carbon starvati...The pivotal role of N^(6)-methyladenosine(m^(6)A)demethylases in regulating plant stress responses has been widely explored;however,the function of apple m^(6)A demethylases under heat stress and fixed-carbon starvation is unclear.In this study,the apple RNA demethylase gene family was identified,and the demethylase gene MdALKBH1A was selected for further analysis.Using liquid chromatography-tandem mass spectrometry(LC-MS/MS)analysis,we demonstrated that MdALKBH1A is the m^(6)A demethylase of apple.Moreover,transgenic‘Micro Tom’tomato plants overexpressing MdALKBH1A were more sensitive to high temperature,probably due to the decreased antioxidant ability,increased membrane lipid peroxidation and reduced plasma membrane stability.However,these tomato plants overexpressing MdALKBH1A were more resistant to fixed-carbon starvation,as evidenced by the improved plasma membrane stability,enhanced photosynthetic rates and elevated autophagic activity.In summary,our results highlight the crucial role played by Md ALKBH1A in the response of apple plants to high-temperature stress and fixedcarbon starvation.展开更多
Titanium dioxide(TiO_(2))nanoparticles are efficient photocatalysis for treating organic pollutants in water.Immobilizing TiO_(2)nanoparticles not only enables the reuse of nanoparticles but also prevents the harmful ...Titanium dioxide(TiO_(2))nanoparticles are efficient photocatalysis for treating organic pollutants in water.Immobilizing TiO_(2)nanoparticles not only enables the reuse of nanoparticles but also prevents the harmful impact of releasing nanoparticles into the aquatic environment.In this study,a porous composite microfiber membrane based on polyacrylonitrile(PAN)with TiO_(2)nanoparticles has been synthesized by electrospinning technique.The new membrane system has exhibited excellent adsorptive-photocatalytic property to degrade Methylene blue(MB).Using the nonlinear form of the pseudo-first-order,pseudo-second-order,Elovich,and Intra-particle diffusion models,the adsorption mechanism was analyzed.Coupling with adsorption and photocatalysis,the efficiency of this membrane system was illustrated via the multistage linear form of the pseudo-first-order kinetic;and the electrical energy per order(EEO)confirmed the lowest energy requirements to transfer selected pollutants.Combining the results of SEM,BET,FTIR,XRD and TGA,it revealed the relationship of microstructure,composition,and MB decomposition performance.The finding presents new knowledge for material design and evaluation of polymers/oxides membrane systems for remediating organic pollutants in water.展开更多
Unlike fossil fuels,hydrogen is a renewable and clean energy source.It is available in a large amount and spreads throughout the world.When reacting with oxygen,hydrogen releases energy to produce water as the only pr...Unlike fossil fuels,hydrogen is a renewable and clean energy source.It is available in a large amount and spreads throughout the world.When reacting with oxygen,hydrogen releases energy to produce water as the only product.Hence,hydrogen is a promising alternative to fossil fuels[1].Today,most of hydrogen is produced via the steam methane reforming process,in which hightemperature steam is used to produce hydrogen from a methane source.However,methane is non-renewable,and carbon dioxide is generated in the reforming process.展开更多
基金supported by the National Natural Science Foundation of China(grant no.12372102)the Science and Technology Innovation Program of Hunan Province(grant no.2022RC1082)+1 种基金the Scientific Research Foundation of Hunan Provincial Education Department(grant no.21A0120)Postgraduate Scientific Research Innovation Project of Hunan Province(grant nos.XDCX2021B139,CX20230551,and CX20220559).
文摘Super strength and toughness,excellent deformation resistance,and high-temperature service performance are the key factors to determine the practical application of new thermal barrier coatings(TBCs).The limited mobility of dislocations and the internal inherent defects in ceramics will inevitably lead to the decline of strength–plasticity and the reduction of service performance.Introducing preexisting twin boundaries and stacking faults(SFs)or preparing ceramic materials with high configuration entropy has demonstrated to be an effective strategy for enhancing the mechanical properties of ceramics.However,due to the positive thermal expansion coefficient of most ceramics and the remarkable increase of structural disorder at elevated temperature,the problem of elastic softening has become a bottleneck restricting the high-temperature service life of new TBCs.In this paper,the deformation behavior of high configuration entropy Zr6Ta2O17 ceramics at 25 to 1,200°C was in situ monitored via digital image correlation technique and three-point bending test platform in high-temperature environment.A remarkable Elinvar-like effect appears in the Zr_(6)Ta_(2)O_(17) ceramic.More interestingly,mechanical deformation dominates the severe lattice distortion(deformation twins,SFs)and the disorder–order transition of chemical order at the atomic scale,while temperature can further enhance the degree of lattice distortion and ordering of Zr6Ta2O17 ceramics.Furthermore,the atomic fluctuations at high temperature promotes the comprehensive improvement of mechanical properties in the Zr6Ta2O17 ceramics.
基金supported by the earmarked fund for the China Agricultural Research System(CARS-27)。
文摘The pivotal role of N^(6)-methyladenosine(m^(6)A)demethylases in regulating plant stress responses has been widely explored;however,the function of apple m^(6)A demethylases under heat stress and fixed-carbon starvation is unclear.In this study,the apple RNA demethylase gene family was identified,and the demethylase gene MdALKBH1A was selected for further analysis.Using liquid chromatography-tandem mass spectrometry(LC-MS/MS)analysis,we demonstrated that MdALKBH1A is the m^(6)A demethylase of apple.Moreover,transgenic‘Micro Tom’tomato plants overexpressing MdALKBH1A were more sensitive to high temperature,probably due to the decreased antioxidant ability,increased membrane lipid peroxidation and reduced plasma membrane stability.However,these tomato plants overexpressing MdALKBH1A were more resistant to fixed-carbon starvation,as evidenced by the improved plasma membrane stability,enhanced photosynthetic rates and elevated autophagic activity.In summary,our results highlight the crucial role played by Md ALKBH1A in the response of apple plants to high-temperature stress and fixedcarbon starvation.
基金This study was partially supported by the National Science Foundation of China(41720104007,41430106)the Major Ministry of Science and Technology of China(2019YFC1803500)This research is supported by China Scholarships Council。
文摘Titanium dioxide(TiO_(2))nanoparticles are efficient photocatalysis for treating organic pollutants in water.Immobilizing TiO_(2)nanoparticles not only enables the reuse of nanoparticles but also prevents the harmful impact of releasing nanoparticles into the aquatic environment.In this study,a porous composite microfiber membrane based on polyacrylonitrile(PAN)with TiO_(2)nanoparticles has been synthesized by electrospinning technique.The new membrane system has exhibited excellent adsorptive-photocatalytic property to degrade Methylene blue(MB).Using the nonlinear form of the pseudo-first-order,pseudo-second-order,Elovich,and Intra-particle diffusion models,the adsorption mechanism was analyzed.Coupling with adsorption and photocatalysis,the efficiency of this membrane system was illustrated via the multistage linear form of the pseudo-first-order kinetic;and the electrical energy per order(EEO)confirmed the lowest energy requirements to transfer selected pollutants.Combining the results of SEM,BET,FTIR,XRD and TGA,it revealed the relationship of microstructure,composition,and MB decomposition performance.The finding presents new knowledge for material design and evaluation of polymers/oxides membrane systems for remediating organic pollutants in water.
基金This research was supported by the Open Foundation of the Key Laboratory of Functional Molecular Solids,Ministry of Education(FMS201930)the National Natural Science Foundation of China(Grant No.21201008)+1 种基金the Natural Science Foundation of Anhui Province(1208085QB31)the Natural Science Research Projects of Colleges and Universities in Anhui Province(No.KJ2017A311).
文摘Unlike fossil fuels,hydrogen is a renewable and clean energy source.It is available in a large amount and spreads throughout the world.When reacting with oxygen,hydrogen releases energy to produce water as the only product.Hence,hydrogen is a promising alternative to fossil fuels[1].Today,most of hydrogen is produced via the steam methane reforming process,in which hightemperature steam is used to produce hydrogen from a methane source.However,methane is non-renewable,and carbon dioxide is generated in the reforming process.
