Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal function.In a healthy spinal cord,microglia are accou...Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal function.In a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal regeneration.In this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor cells.Despite a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive research.This review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target.展开更多
This paper introduces the response process of the Gansu Earthquake Agency during the Jiuzhaigou M_S7.0 earthquake in Sichuan Province,including earthquake emergency disposal procedures,information reports,disaster inv...This paper introduces the response process of the Gansu Earthquake Agency during the Jiuzhaigou M_S7.0 earthquake in Sichuan Province,including earthquake emergency disposal procedures,information reports,disaster investigation and intensity assessment,seismic monitoring and trend determination,and emergency dissemination. This paper reveals the characteristics of earthquake damage in the quake-hit areas of Gansu Province,draws some corresponding conclusions and summarizes the countermeasures for recovery and reconstruction in the quake-hit areas of Gansu Province.展开更多
The relationship between the data to be transmitted and the signal phase in the 16-level quadrature amplitude modulation （16-QAM） constellation is derived. Then a new carder recovery method based on this relationshi...The relationship between the data to be transmitted and the signal phase in the 16-level quadrature amplitude modulation （16-QAM） constellation is derived. Then a new carder recovery method based on this relationship is proposed, where both-the diagonal and non-diagonal signal points are used for carder recovery. The analysis and simulation results show that, the proposed method for 16-QAM has a higher acquisition speed than the times-four carrier recovery method, and has a wider acquisition bandwidth and smaller phase errors than the diagonal constellation based carrier recovery method.展开更多
Study was made on the swerving of the curves of strength and hardness vs L-M parameter P=T(20+lgt)for steel 20Crl 1MoVNbNB aged at 550.600 and 650℃ for 0—5000 h,T being aging temperature in K and taging time in h.Th...Study was made on the swerving of the curves of strength and hardness vs L-M parameter P=T(20+lgt)for steel 20Crl 1MoVNbNB aged at 550.600 and 650℃ for 0—5000 h,T being aging temperature in K and taging time in h.The swerving seems to be due to:(1)the coarsening of the mean size of principal precipitate M_(23)C_6,(2)the precipitation of Laves phase MoFe_2;(3)the decrease of Mo content in matrix and(4)the recovery and recrystallization of the matrix phase.展开更多
文摘Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal function.In a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal regeneration.In this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor cells.Despite a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive research.This review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target.
基金sponsored by the National Natural Science Foundation of China(51678545)
文摘This paper introduces the response process of the Gansu Earthquake Agency during the Jiuzhaigou M_S7.0 earthquake in Sichuan Province,including earthquake emergency disposal procedures,information reports,disaster investigation and intensity assessment,seismic monitoring and trend determination,and emergency dissemination. This paper reveals the characteristics of earthquake damage in the quake-hit areas of Gansu Province,draws some corresponding conclusions and summarizes the countermeasures for recovery and reconstruction in the quake-hit areas of Gansu Province.
基金The National Natural Foundation of China(No60472089)
文摘The relationship between the data to be transmitted and the signal phase in the 16-level quadrature amplitude modulation （16-QAM） constellation is derived. Then a new carder recovery method based on this relationship is proposed, where both-the diagonal and non-diagonal signal points are used for carder recovery. The analysis and simulation results show that, the proposed method for 16-QAM has a higher acquisition speed than the times-four carrier recovery method, and has a wider acquisition bandwidth and smaller phase errors than the diagonal constellation based carrier recovery method.
文摘Study was made on the swerving of the curves of strength and hardness vs L-M parameter P=T(20+lgt)for steel 20Crl 1MoVNbNB aged at 550.600 and 650℃ for 0—5000 h,T being aging temperature in K and taging time in h.The swerving seems to be due to:(1)the coarsening of the mean size of principal precipitate M_(23)C_6,(2)the precipitation of Laves phase MoFe_2;(3)the decrease of Mo content in matrix and(4)the recovery and recrystallization of the matrix phase.
