The issue of the influence of coronal holes （CHs） on coronal mass ejections （CMEs） in causing solar energetic particle （SEP） events is revisited. It is a continuation and extension of our previous work, in which...The issue of the influence of coronal holes （CHs） on coronal mass ejections （CMEs） in causing solar energetic particle （SEP） events is revisited. It is a continuation and extension of our previous work, in which no evident effects of CHs on CMEs in generating SEPs were found by statistically investigating 56 CME events. This result is consistent with the conclusion obtained by Kahler in 2004. We extrapolate the coronal magnetic field, define CHs as the regions consisting of only open magnetic field lines and perform a similar analysis on this issue for 76 events in total by extending the study interval to the end of 2008. Three key parameters, CH proximity, CH area and CH relative position, are involved in the analysis. The new result confirms the previous conclusion that CHs did not show any evident effect on CMEs in causing SEP events.展开更多
We investigate the evolutions of two prominences （P1, P2） and two bundles of coronal loops （L1, L2）, observed with SDO/AIA near the east solar limb on 2012 September 22. It is found that there were large-amplitude...We investigate the evolutions of two prominences （P1, P2） and two bundles of coronal loops （L1, L2）, observed with SDO/AIA near the east solar limb on 2012 September 22. It is found that there were large-amplitude oscillations in P1 and L1 but no detectable motions in P2 and L2. These transverse oscillations were triggered by a large-scale coronal wave, originating from a large flare in a remote active region behind the solar limb. By carefully comparing the locations and heights of these oscillating and non-oscillating structures, we conclude that the propagating height of the wave is between 50 Mm and 130 Mm. The wave energy deposited in the oscillating prominence and coronal loops is at least of the order of 10-8 erg. Furthermore, local magnetic field strength and Alfv6n speeds are derived from the oscillating periods and damping time scales, which are extracted from the time series of the oscillations. It is demon- strated that oscillations can be used in not only coronal seismology, but also to reveal the properties of the wave.展开更多
Energy transfer between chemilumine-scence(CL)donor and acceptor enables the tunable long-wavelength emission for multidisciplinary applications.In this work,the carbon nanodots(CDs)with sp^(3)-hybrid carbon nitride f...Energy transfer between chemilumine-scence(CL)donor and acceptor enables the tunable long-wavelength emission for multidisciplinary applications.In this work,the carbon nanodots(CDs)with sp^(3)-hybrid carbon nitride framework exhibit a conspicuous tunable CL wavelength in luminol-H_(2)O_(2) reaction with ultrahigh energy transfer efficiency.The density functional theorical calculations and experimental surveys reveal that the synergistic effect of singlet/triplet mixed electron exchange between the CD and luminol-H_(2)O_(2) reaction enable the efficient energy transfer,and the concentration-dependent distance between the luminol donor and CD acceptor mutate the efficiency of singlet/triplet electron exchange,leading to the efficient concentration-dependent CL emission.With the novel CL emission,an advanced paper-based CL system is established with the CDs and luminol-H_(2)O_(2) reaction,and the applications of information encryption and anti-counterfeiting are achieved.This work paves a new paradigm to understand the energy transfer mechanism in CL process,and may inspire the design of new CL architecture.展开更多
Advanced antibacterial technologies are needed to counter the rapid emergence of drug-resistant bacteria.Imageguided therapy is one of the most promising strategies for efficiently and accurately curing bacterial infe...Advanced antibacterial technologies are needed to counter the rapid emergence of drug-resistant bacteria.Imageguided therapy is one of the most promising strategies for efficiently and accurately curing bacterial infections.Herein,a chemiluminescence(CL)-dynamic/guided antibacteria(CDGA)with multiple reactive oxygen species(ROS)generation capacity and chemiexcited near-infrared emission has been designed for the precise theranostics of bacterial infection by employing near-infrared emissive carbon nanodots(CDs)and peroxalate as CL fuels.Mechanistically,hydrogen peroxide generated in the bacterial microenvironment can trigger the chemically initiated electron exchange between CDs and energy-riched intermediate originated from the oxidized peroxalate,enabling bacterial induced inflammation imaging.Meanwhile,type Ⅰ/Ⅱ photochemical ROS production and type Ⅲ ultrafast charge transfer from CDs under the self-illumination can inhibit the bacteria proliferation efficiently.The potential clinical utility of CDGA is further demonstrated in bacteria infected mice trauma model.The self-illuminating CDGA exhibits an excellent in vivo imaging quality in early detecting wound infections and internal inflammation caused by bacteria,and further are proven as efficient broad-spectrum antibacterial nanomedicines without drug-resistance,whose sterilizing rate is up to 99.99%.展开更多
Recently,the chemiluminescence(CL)induced by carbon nanodots(CDs)has intrigued researchers’extensive interests in various applications due to its special light emission principle.However,the difficulty of synthesizin...Recently,the chemiluminescence(CL)induced by carbon nanodots(CDs)has intrigued researchers’extensive interests in various applications due to its special light emission principle.However,the difficulty of synthesizing chemiluminescent CDs with full-spectrum emission severely hinders the further regulation of the CL emission mechanism.Herein,the multi-color-emissive chemiluminescent CDs are rational designed and further synthesized by regulating the sp2-hybrid core and sp3-hybrid surface from the citrate-ammonia molecular in a single solvothermal reaction.More experimental characterizations and density functional theory calculations reveal that the higher temperature can promote the crosslinking polymerization/carbonization of carbon core and the higher protonation of solvent can determine the core size of final CDs,resulting in the variant CL emission from molecular-,crosslinking-and core-states.Thus,the CL emission of the CDs can be further synthesized by tuning the luminescence chromophores in the formation process via regulating the temperature and solvent,enabling the applications of the CL CDs in illumination and information encryption.This study paves a new technology to understand the luminescence of CDs and affords an industry translational potential over traditional chemiluminescent molecular.展开更多
基金supported by grants from the National Natural Science Foundation of China(Grant Nos.40904046,40874075 and 40525014)the 973 National Basic Research Program(2006CB806304)+2 种基金the Ministry of Education of China(200530)the Program for New Century Excellent Talents in University(NCET-08-0524)the Chinese Academy of Sciences(KZCX2-YW-QN511, KJCX2-YW-N28 and the startup fund)
文摘The issue of the influence of coronal holes （CHs） on coronal mass ejections （CMEs） in causing solar energetic particle （SEP） events is revisited. It is a continuation and extension of our previous work, in which no evident effects of CHs on CMEs in generating SEPs were found by statistically investigating 56 CME events. This result is consistent with the conclusion obtained by Kahler in 2004. We extrapolate the coronal magnetic field, define CHs as the regions consisting of only open magnetic field lines and perform a similar analysis on this issue for 76 events in total by extending the study interval to the end of 2008. Three key parameters, CH proximity, CH area and CH relative position, are involved in the analysis. The new result confirms the previous conclusion that CHs did not show any evident effect on CMEs in causing SEP events.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41131065, 41574165, 41421063 and 41304134)MOEC (20113402110001)+2 种基金CAS Key Research Program (KZZD-EW-01-4)the fundamental research funds for the central universities (WK2080000077)the foundation for Young Talents in College of Anhui Province (2013SQRL044ZD)
文摘We investigate the evolutions of two prominences （P1, P2） and two bundles of coronal loops （L1, L2）, observed with SDO/AIA near the east solar limb on 2012 September 22. It is found that there were large-amplitude oscillations in P1 and L1 but no detectable motions in P2 and L2. These transverse oscillations were triggered by a large-scale coronal wave, originating from a large flare in a remote active region behind the solar limb. By carefully comparing the locations and heights of these oscillating and non-oscillating structures, we conclude that the propagating height of the wave is between 50 Mm and 130 Mm. The wave energy deposited in the oscillating prominence and coronal loops is at least of the order of 10-8 erg. Furthermore, local magnetic field strength and Alfv6n speeds are derived from the oscillating periods and damping time scales, which are extracted from the time series of the oscillations. It is demon- strated that oscillations can be used in not only coronal seismology, but also to reveal the properties of the wave.
基金the support of this research by the National Key R&D Program of China(No.2022YFB3608604)the National Natural Science Foundation of China(Nos.62204223,U2004168,and 12074348)+2 种基金China Postdoctoral Science Foundation(No.2022TQ0307)the Natural Science Foundation of Henan Province(Nos.212300410078 and 222102310664)National Supercomputing Center in Zhengzhou.
文摘Energy transfer between chemilumine-scence(CL)donor and acceptor enables the tunable long-wavelength emission for multidisciplinary applications.In this work,the carbon nanodots(CDs)with sp^(3)-hybrid carbon nitride framework exhibit a conspicuous tunable CL wavelength in luminol-H_(2)O_(2) reaction with ultrahigh energy transfer efficiency.The density functional theorical calculations and experimental surveys reveal that the synergistic effect of singlet/triplet mixed electron exchange between the CD and luminol-H_(2)O_(2) reaction enable the efficient energy transfer,and the concentration-dependent distance between the luminol donor and CD acceptor mutate the efficiency of singlet/triplet electron exchange,leading to the efficient concentration-dependent CL emission.With the novel CL emission,an advanced paper-based CL system is established with the CDs and luminol-H_(2)O_(2) reaction,and the applications of information encryption and anti-counterfeiting are achieved.This work paves a new paradigm to understand the energy transfer mechanism in CL process,and may inspire the design of new CL architecture.
基金the support of the National Natural Science Foundation of China(U2004168,12074348 and 11974317)the Natural Science Foundation of Henan Province(212300410078).
文摘Advanced antibacterial technologies are needed to counter the rapid emergence of drug-resistant bacteria.Imageguided therapy is one of the most promising strategies for efficiently and accurately curing bacterial infections.Herein,a chemiluminescence(CL)-dynamic/guided antibacteria(CDGA)with multiple reactive oxygen species(ROS)generation capacity and chemiexcited near-infrared emission has been designed for the precise theranostics of bacterial infection by employing near-infrared emissive carbon nanodots(CDs)and peroxalate as CL fuels.Mechanistically,hydrogen peroxide generated in the bacterial microenvironment can trigger the chemically initiated electron exchange between CDs and energy-riched intermediate originated from the oxidized peroxalate,enabling bacterial induced inflammation imaging.Meanwhile,type Ⅰ/Ⅱ photochemical ROS production and type Ⅲ ultrafast charge transfer from CDs under the self-illumination can inhibit the bacteria proliferation efficiently.The potential clinical utility of CDGA is further demonstrated in bacteria infected mice trauma model.The self-illuminating CDGA exhibits an excellent in vivo imaging quality in early detecting wound infections and internal inflammation caused by bacteria,and further are proven as efficient broad-spectrum antibacterial nanomedicines without drug-resistance,whose sterilizing rate is up to 99.99%.
基金the National Natural Science Foundation of China(Nos.U2004168,12074348,11974317,12261141661,and 62204223)the China Postdoctoral Science Foundation(No.2022TQ0307)the Natural Science Foundation of Henan Province(Nos.212300410078 and 222102310664)。
文摘Recently,the chemiluminescence(CL)induced by carbon nanodots(CDs)has intrigued researchers’extensive interests in various applications due to its special light emission principle.However,the difficulty of synthesizing chemiluminescent CDs with full-spectrum emission severely hinders the further regulation of the CL emission mechanism.Herein,the multi-color-emissive chemiluminescent CDs are rational designed and further synthesized by regulating the sp2-hybrid core and sp3-hybrid surface from the citrate-ammonia molecular in a single solvothermal reaction.More experimental characterizations and density functional theory calculations reveal that the higher temperature can promote the crosslinking polymerization/carbonization of carbon core and the higher protonation of solvent can determine the core size of final CDs,resulting in the variant CL emission from molecular-,crosslinking-and core-states.Thus,the CL emission of the CDs can be further synthesized by tuning the luminescence chromophores in the formation process via regulating the temperature and solvent,enabling the applications of the CL CDs in illumination and information encryption.This study paves a new technology to understand the luminescence of CDs and affords an industry translational potential over traditional chemiluminescent molecular.
