在现代电力系统管理中,实时监测输电线路的状态至关重要,这不仅有助于提前预防故障,而且能优化能源分配和增强系统的可靠性。通用分组无线业务(General Packet Radio Service,GPRS)技术作为一种成熟的无线数据传输手段,为远程输电线路...在现代电力系统管理中,实时监测输电线路的状态至关重要,这不仅有助于提前预防故障,而且能优化能源分配和增强系统的可靠性。通用分组无线业务(General Packet Radio Service,GPRS)技术作为一种成熟的无线数据传输手段,为远程输电线路监测提供了一种有效的通信解决方案。文章设计基于GPRS技术的输电线路状态数据通信系统,重点分析系统的总体架构、GPRS通信模块的设计、数据管理与传输策略以及安全性与容错机制的构建,并阐述测试系统的方法及其效果。展开更多
The spatial and temporal variations of turbulent diapycnal mixing along 18°N in the South China Sea （SCS） are estimated by a fine-scale parameterization method based on strain, which is obtained from CTD measur...The spatial and temporal variations of turbulent diapycnal mixing along 18°N in the South China Sea （SCS） are estimated by a fine-scale parameterization method based on strain, which is obtained from CTD measurements in yearly September from 2004 to 2010. The section mean diffusivity can reach -10-4 m^2/s, which is an order of magnitude larger than the value in the open ocean. Both internal tides and wind-generated near-inertial internal waves play an important role in furnishing the diapycnal mixing here. The former dominates the diapycnal mixing in the deep ocean and makes nonnegligible contribution in the upper ocean, leading to enhanced diapycnal mixing throughout the water column over rough topography, in contrast, the influence of the wind-induced near- inertial internal wave is mainly confined to the upper ocean. Over both flat and rough bathymetries, the diapycnal diffusivity has a growth trend from 2005 to 2010 in the upper 700 m, which results from the increase of wind work on the near-inertial motions.展开更多
文摘在现代电力系统管理中,实时监测输电线路的状态至关重要,这不仅有助于提前预防故障,而且能优化能源分配和增强系统的可靠性。通用分组无线业务(General Packet Radio Service,GPRS)技术作为一种成熟的无线数据传输手段,为远程输电线路监测提供了一种有效的通信解决方案。文章设计基于GPRS技术的输电线路状态数据通信系统,重点分析系统的总体架构、GPRS通信模块的设计、数据管理与传输策略以及安全性与容错机制的构建,并阐述测试系统的方法及其效果。
基金The National Basic Research Program(973 Program) of China under contract No.2013CB956201the National Natural Science Foundation of China under contract Nos 41521091,U1406401 and 41622602the Global Change Project under contract No.GASI-03-01-01-05
文摘The spatial and temporal variations of turbulent diapycnal mixing along 18°N in the South China Sea （SCS） are estimated by a fine-scale parameterization method based on strain, which is obtained from CTD measurements in yearly September from 2004 to 2010. The section mean diffusivity can reach -10-4 m^2/s, which is an order of magnitude larger than the value in the open ocean. Both internal tides and wind-generated near-inertial internal waves play an important role in furnishing the diapycnal mixing here. The former dominates the diapycnal mixing in the deep ocean and makes nonnegligible contribution in the upper ocean, leading to enhanced diapycnal mixing throughout the water column over rough topography, in contrast, the influence of the wind-induced near- inertial internal wave is mainly confined to the upper ocean. Over both flat and rough bathymetries, the diapycnal diffusivity has a growth trend from 2005 to 2010 in the upper 700 m, which results from the increase of wind work on the near-inertial motions.
