The study of China s carbon emissions and carbon sequestration potential is of great practical significance to the formulation of carbon neutrality strategies and methods of China.Carbon emission is an inevitable outc...The study of China s carbon emissions and carbon sequestration potential is of great practical significance to the formulation of carbon neutrality strategies and methods of China.Carbon emission is an inevitable outcome of the initial stage of economic development,especially the right of developing countries existence and development.The carbon emission of China has been maintained at a low level for a long time and reached the top of the world in 2005.However,per capita carbon emission was still only 46.28%of the United States in 2016.China s total CO_(2) emissions are expected to reach 17-19 Gt/a by 2030.To achieve the goal of carbon neutrality in 2060,the main problems are the low technical capacity of emission reduction and the unreasonable structure of energy consumption.Therefore,replacing coal with gas is one of the most effective ways of emission reduction.By 2060,the carbon sequestration capacity of forest vegetation will reach or exceed 759.14 Mt/a and the CO_(2) sequestration capacity will reach 2783.5 Mt/a.According to that,China s carbon intensity must reduce by 95.39%on the basis of the carbon intensity in 2017,reaching 640 t/100 million yuan.The carbon sequestration capacity of terrestrial vegetation(forest,grassland)will reach or exceed 1380.3 Mt/a and the CO_(2) sequestration capacity will reach 5069.3 Mt/a.According to that,China s carbon intensity must reduce by 91.07%on the basis of the carbon intensity in 2017,reach 1152 t C per 100 million yuan.展开更多
Revealing the mechanisms of speciation remains one of the most attractive and challenging issues in the field of evolutionary biology, and is also key to understanding the biodiversity present in nature.
Ischemic stroke is a major public health problem worldwide.Although the circadian clock is involved in the process of ischemic stroke,the exact mechanism of the circadian clock in regulating angiogenesis after cerebra...Ischemic stroke is a major public health problem worldwide.Although the circadian clock is involved in the process of ischemic stroke,the exact mechanism of the circadian clock in regulating angiogenesis after cerebral infarction remains unclear.In the present study,we determined that environmental circadian disruption(ECD)increased the stroke severity and impaired angiogenesis in the rat middle cerebral artery occlusion model,by measuring the infarct volume,neurological tests,and angiogenesis-related protein.We further report that Bmal1 plays an irreplaceable role in angiogenesis.Overexpression of Bmal1 promoted tube-forming,migration,and wound healing,and upregulated the vascular endothelial growth factor(VEGF)and Notch pathway protein levels.This promoting effect was reversed by the Notch pathway inhibitor DAPT,according to the results of angiogenesis capacity and VEGF pathway protein level.In conclusion,our study reveals the intervention of ECD in angiogenesis in ischemic stroke and further identifies the exact mechanism by which Bmal1 regulates angiogenesis through the VEGF-Notch1 pathway.展开更多
The AZ80 magnesium(Mg)alloy cabin component with high strength and excellent ductility was developed by W-shaped channel extrusion(WCE)at 350℃ and subsequent T6 heat treatment.The effect of WCE process on the microst...The AZ80 magnesium(Mg)alloy cabin component with high strength and excellent ductility was developed by W-shaped channel extrusion(WCE)at 350℃ and subsequent T6 heat treatment.The effect of WCE process on the microstructure and mechanical properties of the alloy was experimentally investigated,and the age-hardening behavior with microstructure evolution during heat treatment was revealed.Due to the introduction of multi-stage asymmetric extrusion and severe shear deformation along the annular channel,the average grain size of the WCE extruded alloy could be effectively refined to 4.7μm.Besides,theβphase particles were dynamically precipitated from the fine grain boundaries during extrusion,which hindered the grain growth,but worsen the material plasticity.After T6 treatment,the properties of component were eventually improved to a yield strength(YS)of 218 MPa and ultimate tensile strength(UTS)of 344 MPa with elongation(EL)of 14.5%.It was revealed that the rod/lath-and needle-shaped continuousβphase(CP)with finer size precipitated after T6 treatment was more effective in hindering the movement of dislocations and strengthened the alloy than lamellar discontinuousβphase(DP).The dispersed phase precipitated in the grains,the annihilation of dislocations,the uniformly distributed grains and the re-dissolution ofβphase particles at initial grain boundaries after T6 treatment greatly contributed to the ductility of alloy.Moreover,the T6 treatment also promoted the basal plane of most grains which were re-arranged to the extrusion direction,which promoted the possibility of non-basal slip activation and further improved the elongation of the alloy.As a result,the UTS and YS of the final component increased by 10%and the EL increased by 7%,respectively.展开更多
Wave propagation in a piezoelectric layered structure of a film bulk acoustic resonator （FBAR/ is studied. The accurate results of dispersion relation are calculated using the proposed elastic electrode model for bot...Wave propagation in a piezoelectric layered structure of a film bulk acoustic resonator （FBAR/ is studied. The accurate results of dispersion relation are calculated using the proposed elastic electrode model for both electroded and unelectroded layered plates. The differences of calculated cut-off frequencies between the current elastic electrode model and the simplified inertial electrode model （often used in the quartz resonator analysis） are illustrated in detail, which shows that an elastic electrode model is indeed needed for the accurate analysis of FBAR. These results can be used as an accurate criterion to calibrate the 2-D theoretical model for a real finite-size structure of FBAR.展开更多
文摘The study of China s carbon emissions and carbon sequestration potential is of great practical significance to the formulation of carbon neutrality strategies and methods of China.Carbon emission is an inevitable outcome of the initial stage of economic development,especially the right of developing countries existence and development.The carbon emission of China has been maintained at a low level for a long time and reached the top of the world in 2005.However,per capita carbon emission was still only 46.28%of the United States in 2016.China s total CO_(2) emissions are expected to reach 17-19 Gt/a by 2030.To achieve the goal of carbon neutrality in 2060,the main problems are the low technical capacity of emission reduction and the unreasonable structure of energy consumption.Therefore,replacing coal with gas is one of the most effective ways of emission reduction.By 2060,the carbon sequestration capacity of forest vegetation will reach or exceed 759.14 Mt/a and the CO_(2) sequestration capacity will reach 2783.5 Mt/a.According to that,China s carbon intensity must reduce by 95.39%on the basis of the carbon intensity in 2017,reaching 640 t/100 million yuan.The carbon sequestration capacity of terrestrial vegetation(forest,grassland)will reach or exceed 1380.3 Mt/a and the CO_(2) sequestration capacity will reach 5069.3 Mt/a.According to that,China s carbon intensity must reduce by 91.07%on the basis of the carbon intensity in 2017,reach 1152 t C per 100 million yuan.
基金supported by the National Natural Science Foundation of China(31925006)Yunnan Revitalization Talent Support Program(Science&Technology Champion Project:202305AB350001)the Scientific Research Foundation of Education Department of Yunnan Province(2023Y0225)。
文摘Revealing the mechanisms of speciation remains one of the most attractive and challenging issues in the field of evolutionary biology, and is also key to understanding the biodiversity present in nature.
基金This work was supported by the National Natural Science Foundation for Young Scholars of China(82004346 and 82104766)the Natural Science Foundation of Hunan Province(2021JJ30521 and 2021JJ40424)+2 种基金the Open Fund for the First-class Discipline of Integrated Traditional Chinese and Western Medicine of Hunan University of Chinese Medicine(2020ZXYJH38 and 2020ZXYJH39)Natural Science Foundation of Changsha(kq2208202)the University-level Fund Project of Hunan University of Chinese Medicine(2021XJJJ039).
文摘Ischemic stroke is a major public health problem worldwide.Although the circadian clock is involved in the process of ischemic stroke,the exact mechanism of the circadian clock in regulating angiogenesis after cerebral infarction remains unclear.In the present study,we determined that environmental circadian disruption(ECD)increased the stroke severity and impaired angiogenesis in the rat middle cerebral artery occlusion model,by measuring the infarct volume,neurological tests,and angiogenesis-related protein.We further report that Bmal1 plays an irreplaceable role in angiogenesis.Overexpression of Bmal1 promoted tube-forming,migration,and wound healing,and upregulated the vascular endothelial growth factor(VEGF)and Notch pathway protein levels.This promoting effect was reversed by the Notch pathway inhibitor DAPT,according to the results of angiogenesis capacity and VEGF pathway protein level.In conclusion,our study reveals the intervention of ECD in angiogenesis in ischemic stroke and further identifies the exact mechanism by which Bmal1 regulates angiogenesis through the VEGF-Notch1 pathway.
基金supported by the Shanxi Provincial Science and Technology Cooperation and Exchange Project(No.202104041101033)the special fund for Science and Technology Innovation Teams of Shanxi Province+1 种基金the Shanxi Province's Key Core Technology and Common Technology Research and Development Special Project(No.2020XXX015)the Ningbo Natural Science Foundation(Project 2021J231 and 2021J232).
文摘The AZ80 magnesium(Mg)alloy cabin component with high strength and excellent ductility was developed by W-shaped channel extrusion(WCE)at 350℃ and subsequent T6 heat treatment.The effect of WCE process on the microstructure and mechanical properties of the alloy was experimentally investigated,and the age-hardening behavior with microstructure evolution during heat treatment was revealed.Due to the introduction of multi-stage asymmetric extrusion and severe shear deformation along the annular channel,the average grain size of the WCE extruded alloy could be effectively refined to 4.7μm.Besides,theβphase particles were dynamically precipitated from the fine grain boundaries during extrusion,which hindered the grain growth,but worsen the material plasticity.After T6 treatment,the properties of component were eventually improved to a yield strength(YS)of 218 MPa and ultimate tensile strength(UTS)of 344 MPa with elongation(EL)of 14.5%.It was revealed that the rod/lath-and needle-shaped continuousβphase(CP)with finer size precipitated after T6 treatment was more effective in hindering the movement of dislocations and strengthened the alloy than lamellar discontinuousβphase(DP).The dispersed phase precipitated in the grains,the annihilation of dislocations,the uniformly distributed grains and the re-dissolution ofβphase particles at initial grain boundaries after T6 treatment greatly contributed to the ductility of alloy.Moreover,the T6 treatment also promoted the basal plane of most grains which were re-arranged to the extrusion direction,which promoted the possibility of non-basal slip activation and further improved the elongation of the alloy.As a result,the UTS and YS of the final component increased by 10%and the EL increased by 7%,respectively.
基金supported by the National Natural Science Foundation of China (Nos. 11502108, 11232007, 51405225)the Natural Science Foundation of Jiangsu Province (Nos. BK20140037, BK20140808)+2 种基金the Fundamental Research Funds for Central Universities (No. NE2013101)the Program for New Century Excellent Talents in Universities (No. NCET-12-0625)a project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘Wave propagation in a piezoelectric layered structure of a film bulk acoustic resonator （FBAR/ is studied. The accurate results of dispersion relation are calculated using the proposed elastic electrode model for both electroded and unelectroded layered plates. The differences of calculated cut-off frequencies between the current elastic electrode model and the simplified inertial electrode model （often used in the quartz resonator analysis） are illustrated in detail, which shows that an elastic electrode model is indeed needed for the accurate analysis of FBAR. These results can be used as an accurate criterion to calibrate the 2-D theoretical model for a real finite-size structure of FBAR.
