Achieving multi-spectral stealth across visible and infrared(VIS-IR)bands is crucial for military and national defense security in diverse environments.However,the coordination of spectrally selective thermal radiatio...Achieving multi-spectral stealth across visible and infrared(VIS-IR)bands is crucial for military and national defense security in diverse environments.However,the coordination of spectrally selective thermal radiation with angle-insensitive color modulation in flexible architectures remains a significant challenge.Herein,we present a chromatic meta-textile enabling flexible VIS-IR multispectral stealth.The stochastic fiber structure with embedded colorants provides wide-gamut coloration,exhibiting negligible color difference between stealth film and different backgrounds as low as 0.4 L*a*b.Simultaneously,the architecture achieves ultralow emissivity(ε=0.1)in mid-wave infrared(MWIR,3–5μm)and long-wave infrared(LWIR,8–14μm)bands for infrared stealth,while maintaining high emissivity(ε=0.58)in the 5–8μm nonatmospheric window to enable passive radiative cooling.This design features excellent VIS wide-angle compatibility and optical durability,enabling effective stealth in various environments.This integrated multispectral stealth capability,combined with inherent mechanical flexibility and omnidirectional optical stability,positions the structure as a promising solution for next-generation VIS-IR compatible stealth systems.展开更多
The two-dimensional van der Waals ferromagnetic semiconductor CrI3provides an ideal platform for exploring the interplay among structural,electronic and magnetic degrees of freedom.In this work,we systematically in...The two-dimensional van der Waals ferromagnetic semiconductor CrI3provides an ideal platform for exploring the interplay among structural,electronic and magnetic degrees of freedom.In this work,we systematically investigate the thickness-dependent optical properties of five-layer and ten-layer CrI3under hydrostatic pressure up to 27.9 GPa by in situ Raman and UV-visible absorption spectroscopy.All AgRaman modes exhibit a continuous blueshift with increasing pressure.The low-frequency modes(Ag1-Ag3)are mainly associated with enhanced interlayer coupling,whereas the highfrequency modes(Ag4-Ag6)reflect the suppression of surface vibrations.The Raman modes disappear at approximately4.9 GPa for the five-layer sample and 11.2 GPa for the ten-layer sample,indicating a stronger strain sensitivity in thinner CrI3.Optical absorption measurements show a pronounced redshift of the absorption edge,accompanied by bandgap narrowing from 2.26 eV to 1.26 eV in five-layer CrI3.At comparable pressures,the five-layer sample consistently exhibits a wider bandgap than the ten-layer one,which is attributed to quantum confinement effects and reduced interlayer hybridization.Above 12.7 GPa,the bandgap reduction becomes less pronounced,probably due to enhanced Cr 3d/I 5p orbital overlap and strengthened superexchange interactions.These results reveal a clear layer-dependent structure-electronic coupling in CrI3under compression and provide useful insights into pressure modulation of van der Waals magnetic semiconductors.展开更多
The principle of genomic selection(GS) entails estimating breeding values(BVs) by summing all the SNP polygenic effects. The visibleear-infrared spectroscopy(VIS/NIRS) wavelength and abundance values can directly refl...The principle of genomic selection(GS) entails estimating breeding values(BVs) by summing all the SNP polygenic effects. The visibleear-infrared spectroscopy(VIS/NIRS) wavelength and abundance values can directly reflect the concentrations of chemical substances, and the measurement of meat traits by VIS/NIRS is similar to the processing of genomic selection data by summing all ‘polygenic effects' associated with spectral feature peaks. Therefore, it is meaningful to investigate the incorporation of VIS/NIRS information into GS models to establish an efficient and low-cost breeding model. In this study, we measured 6 meat quality traits in 359Duroc×Landrace×Yorkshire pigs from Guangxi Zhuang Autonomous Region, China, and genotyped them with high-density SNP chips. According to the completeness of the information for the target population, we proposed 4breeding strategies applied to different scenarios: Ⅰ, only spectral and genotypic data exist for the target population;Ⅱ, only spectral data exist for the target population;Ⅲ, only spectral and genotypic data but with different prediction processes exist for the target population;and Ⅳ, only spectral and phenotypic data exist for the target population.The 4 scenarios were used to evaluate the genomic estimated breeding value(GEBV) accuracy by increasing the VIS/NIR spectral information. In the results of the 5-fold cross-validation, the genetic algorithm showed remarkable potential for preselection of feature wavelengths. The breeding efficiency of Strategies Ⅱ, Ⅲ, and Ⅳ was superior to that of traditional GS for most traits, and the GEBV prediction accuracy was improved by 32.2, 40.8 and 15.5%, respectively on average. Among them, the prediction accuracy of Strategy Ⅱ for fat(%) even improved by 50.7% compared to traditional GS. The GEBV prediction accuracy of Strategy Ⅰ was nearly identical to that of traditional GS, and the fluctuation range was less than 7%. Moreover, the breeding cost of the 4 strategies was lower than that of traditional GS methods, with Strategy Ⅳ being the lowest as it did not require genotyping.Our findings demonstrate that GS methods based on VIS/NIRS data have significant predictive potential and are worthy of further research to provide a valuable reference for the development of effective and affordable breeding strategies.展开更多
The opticai properties of C,, chemicaiiy modified poiystyrene(C,, -PS copolymer) and the parent polystyrene (PS) films have been investigated.Addition of bulky C,, moiety, a special functional group, to the polystyren...The opticai properties of C,, chemicaiiy modified poiystyrene(C,, -PS copolymer) and the parent polystyrene (PS) films have been investigated.Addition of bulky C,, moiety, a special functional group, to the polystyrene by anovel organometallic reaction modified considerably the optical property of theparent polystyrene. The lattice periodicity of pure PS film is subject to someperturbation or distortion in varying degrees due to the covalent attachInent of bulkyC,, moiety to the polymer backbone. C,,-PS copolymer possesses a new energy ba-ndstructure with indirect forbidden band when compared with the parent PS.展开更多
Fossil plants from the carbonaceous shale of upper part of the Lower Carboniferous Jiujialu Formation in Lindai bauxite deposit fill a gap regarding the distribution of Early Carboniferous flora in Central Guizhou Pro...Fossil plants from the carbonaceous shale of upper part of the Lower Carboniferous Jiujialu Formation in Lindai bauxite deposit fill a gap regarding the distribution of Early Carboniferous flora in Central Guizhou Province.Here the Lindai plant assemblage is systematically described,and its composition and geological age are discussed.Research demonstrates that 9 species in 6 genera of the fossil plants are discovered in this study,and they belong to lycopsids,sphenopsids and ferns,respectively.Based on the analysis of the floral composition,the geological age of the Lindai plant assemblage belongs to the Early Carboniferous Viséan.The discovery of Lindai plant assemblage not only provides a new fossil evidence to restrict the age of bauxite deposits in Lower Carboniferous Jiujialu Formation of Central Guizhou Province,but also has great significance to further research the palaeoecological setting and floral evolution during the Early Carboniferous.展开更多
基金funded by the National Natural Science Foundation of China for Distinguished Young Scholars(52425108)the Guangdong Basic and Applied Basic Research Foundation(2024B1515040022)+3 种基金the National Natural Science Foundation of China(52472196,52473298,52172194,and 52302232)the National Key Research and Development Program of China(2023YFB3809400)the Shenzhen Science and Technology Program(JCYJ20220818102408017,JCYJ20241202123659001,RCJC20210609103733073,KQTD20200820113045081)the National Key Laboratory of Precision Welding&Joining of Materials and Structures(No.24-Z-18)。
摘要Achieving multi-spectral stealth across visible and infrared(VIS-IR)bands is crucial for military and national defense security in diverse environments.However,the coordination of spectrally selective thermal radiation with angle-insensitive color modulation in flexible architectures remains a significant challenge.Herein,we present a chromatic meta-textile enabling flexible VIS-IR multispectral stealth.The stochastic fiber structure with embedded colorants provides wide-gamut coloration,exhibiting negligible color difference between stealth film and different backgrounds as low as 0.4 L*a*b.Simultaneously,the architecture achieves ultralow emissivity(ε=0.1)in mid-wave infrared(MWIR,3–5μm)and long-wave infrared(LWIR,8–14μm)bands for infrared stealth,while maintaining high emissivity(ε=0.58)in the 5–8μm nonatmospheric window to enable passive radiative cooling.This design features excellent VIS wide-angle compatibility and optical durability,enabling effective stealth in various environments.This integrated multispectral stealth capability,combined with inherent mechanical flexibility and omnidirectional optical stability,positions the structure as a promising solution for next-generation VIS-IR compatible stealth systems.
基金supported by the National Natural Science Foundation of China(Grant No.12274193)Natural Science Foundation of Henan(Grant No.242300420640)+1 种基金support from Tianyou Youth Talent Lift Program of Lanzhou Jiaotong Universitythe Young Scholars Science Foundation of Lanzhou Jiaotong University(Grant No.2025027)。
摘要The two-dimensional van der Waals ferromagnetic semiconductor CrI3provides an ideal platform for exploring the interplay among structural,electronic and magnetic degrees of freedom.In this work,we systematically investigate the thickness-dependent optical properties of five-layer and ten-layer CrI3under hydrostatic pressure up to 27.9 GPa by in situ Raman and UV-visible absorption spectroscopy.All AgRaman modes exhibit a continuous blueshift with increasing pressure.The low-frequency modes(Ag1-Ag3)are mainly associated with enhanced interlayer coupling,whereas the highfrequency modes(Ag4-Ag6)reflect the suppression of surface vibrations.The Raman modes disappear at approximately4.9 GPa for the five-layer sample and 11.2 GPa for the ten-layer sample,indicating a stronger strain sensitivity in thinner CrI3.Optical absorption measurements show a pronounced redshift of the absorption edge,accompanied by bandgap narrowing from 2.26 eV to 1.26 eV in five-layer CrI3.At comparable pressures,the five-layer sample consistently exhibits a wider bandgap than the ten-layer one,which is attributed to quantum confinement effects and reduced interlayer hybridization.Above 12.7 GPa,the bandgap reduction becomes less pronounced,probably due to enhanced Cr 3d/I 5p orbital overlap and strengthened superexchange interactions.These results reveal a clear layer-dependent structure-electronic coupling in CrI3under compression and provide useful insights into pressure modulation of van der Waals magnetic semiconductors.
基金supported by the National Natural Science Foundation of China(32160782 and 32060737).
摘要The principle of genomic selection(GS) entails estimating breeding values(BVs) by summing all the SNP polygenic effects. The visibleear-infrared spectroscopy(VIS/NIRS) wavelength and abundance values can directly reflect the concentrations of chemical substances, and the measurement of meat traits by VIS/NIRS is similar to the processing of genomic selection data by summing all ‘polygenic effects' associated with spectral feature peaks. Therefore, it is meaningful to investigate the incorporation of VIS/NIRS information into GS models to establish an efficient and low-cost breeding model. In this study, we measured 6 meat quality traits in 359Duroc×Landrace×Yorkshire pigs from Guangxi Zhuang Autonomous Region, China, and genotyped them with high-density SNP chips. According to the completeness of the information for the target population, we proposed 4breeding strategies applied to different scenarios: Ⅰ, only spectral and genotypic data exist for the target population;Ⅱ, only spectral data exist for the target population;Ⅲ, only spectral and genotypic data but with different prediction processes exist for the target population;and Ⅳ, only spectral and phenotypic data exist for the target population.The 4 scenarios were used to evaluate the genomic estimated breeding value(GEBV) accuracy by increasing the VIS/NIR spectral information. In the results of the 5-fold cross-validation, the genetic algorithm showed remarkable potential for preselection of feature wavelengths. The breeding efficiency of Strategies Ⅱ, Ⅲ, and Ⅳ was superior to that of traditional GS for most traits, and the GEBV prediction accuracy was improved by 32.2, 40.8 and 15.5%, respectively on average. Among them, the prediction accuracy of Strategy Ⅱ for fat(%) even improved by 50.7% compared to traditional GS. The GEBV prediction accuracy of Strategy Ⅰ was nearly identical to that of traditional GS, and the fluctuation range was less than 7%. Moreover, the breeding cost of the 4 strategies was lower than that of traditional GS methods, with Strategy Ⅳ being the lowest as it did not require genotyping.Our findings demonstrate that GS methods based on VIS/NIRS data have significant predictive potential and are worthy of further research to provide a valuable reference for the development of effective and affordable breeding strategies.
摘要The opticai properties of C,, chemicaiiy modified poiystyrene(C,, -PS copolymer) and the parent polystyrene (PS) films have been investigated.Addition of bulky C,, moiety, a special functional group, to the polystyrene by anovel organometallic reaction modified considerably the optical property of theparent polystyrene. The lattice periodicity of pure PS film is subject to someperturbation or distortion in varying degrees due to the covalent attachInent of bulkyC,, moiety to the polymer backbone. C,,-PS copolymer possesses a new energy ba-ndstructure with indirect forbidden band when compared with the parent PS.
基金financially supported by the National Natural Science Foundation of China(No.U1812402)the project of the scientific and technological innovation team of sedimentary deposits in Guizhou Province(No.20185613)+1 种基金the project of the graduate scientific research fund of Guizhou Province(No.YJSCXJH[2019]039)the Project of Young Scientific Talent of Guizhou(No.2016117)。
摘要Fossil plants from the carbonaceous shale of upper part of the Lower Carboniferous Jiujialu Formation in Lindai bauxite deposit fill a gap regarding the distribution of Early Carboniferous flora in Central Guizhou Province.Here the Lindai plant assemblage is systematically described,and its composition and geological age are discussed.Research demonstrates that 9 species in 6 genera of the fossil plants are discovered in this study,and they belong to lycopsids,sphenopsids and ferns,respectively.Based on the analysis of the floral composition,the geological age of the Lindai plant assemblage belongs to the Early Carboniferous Viséan.The discovery of Lindai plant assemblage not only provides a new fossil evidence to restrict the age of bauxite deposits in Lower Carboniferous Jiujialu Formation of Central Guizhou Province,but also has great significance to further research the palaeoecological setting and floral evolution during the Early Carboniferous.