随着国家卫星遥感技术的发展,自然资源遥感监测成果呈高速化增长之势,如何高效管理与利用遥感监测成果需要深入研究与探索。以省域遥感监测成果数据为基础,利用地理信息系统(Geographic Information System,GIS)、遥感(Remote Sensing,...随着国家卫星遥感技术的发展,自然资源遥感监测成果呈高速化增长之势,如何高效管理与利用遥感监测成果需要深入研究与探索。以省域遥感监测成果数据为基础,利用地理信息系统(Geographic Information System,GIS)、遥感(Remote Sensing,RS)、Web等技术建成省域自然资源遥感动态监测服务平台,实现遥感监测成果数据入库、管理、统计分析等一体化管理与应用,提高土地执法、耕地保护等自然资源监测信息化水平,提升遥感监测成果管理应用与决策分析能力。展开更多
基于FTP(File Transfer Protocol)服务开发了省域遥感影像即时服务管理平台,根据更新区域的矢量数据拓扑分析得到需要更新的子节点服务器信息。通过FTP服务实现瓦片数据的在线传输并结合瓦片融合技术完成地图瓦片的更新,实现了不同服务...基于FTP(File Transfer Protocol)服务开发了省域遥感影像即时服务管理平台,根据更新区域的矢量数据拓扑分析得到需要更新的子节点服务器信息。通过FTP服务实现瓦片数据的在线传输并结合瓦片融合技术完成地图瓦片的更新,实现了不同服务器间ArcGIS Server地图服务的联动更新。展开更多
本文研究了具有通信带宽约束的多传感器网络系统的多速率状态分布融合估计。对于多速率采样数据系统,提出了一种新的扩充方法,将多速率采样数据系统转换为单速率系统。首先,为了满足有限的通信带宽,采用降维策略只允许局部估计信号的部...本文研究了具有通信带宽约束的多传感器网络系统的多速率状态分布融合估计。对于多速率采样数据系统,提出了一种新的扩充方法,将多速率采样数据系统转换为单速率系统。首先,为了满足有限的通信带宽,采用降维策略只允许局部估计信号的部分分量发送到融合中心(fusion center,FC),同时给出了一种补偿策略来补偿每个分量的未发送分量。然后,对于由多速率传感器产生的局部状态估计,借助顺序快速协方差交叉(sequential fast co⁃variance intersection,SFCI)方法,提出了一种新的融合估计方法。最后,提供了一个对导航系统定位追踪的仿真实例,验证所提出的分布式融合估计方法的有效性。展开更多
Optimized fin arrangement and dimension of heat exchanger can improve the maximum output power of thermoelectric generator(TEG)system which converts the wasted heat into electricity with thermoelectric modules(TEMs).C...Optimized fin arrangement and dimension of heat exchanger can improve the maximum output power of thermoelectric generator(TEG)system which converts the wasted heat into electricity with thermoelectric modules(TEMs).Considering that the geometric symmetry contributes to the temperature uniformity improvement and convenient TEMs arrangement,a low-backpressure TEG system based on a polyhedral-shape heat exchanger was developed.To assess the effect of inner topology and fin parameters on the heat transfer and output power of the TEG system,a realizable k-?turbulence based numerical model was established and validated to perform numerical simulations.The results demonstrate that increasing fin length,fin width and fin intersection angle are beneficial to the average surface temperature,temperature distribution uniformity and maximum output power of the TEG system.Moreover,decreasing fin spacing distance contributes to the enhanced average surface temperature and maximum power of TEG system,and has insignificant effect on its temperature uniformity.The inserted fins with optimal length,width,intersection angle and spacing distance enhance higher output power,whereas result in increasing backpressure.The maximum difference between the experimental and simulation results is 3.2%,which validates the feasibility of the established numerical model.It also provides a theoretical reference to the optimal design and performance analysis of low-backpressure TEG systems used in automobile exhaust heat recovery.展开更多
文摘随着国家卫星遥感技术的发展,自然资源遥感监测成果呈高速化增长之势,如何高效管理与利用遥感监测成果需要深入研究与探索。以省域遥感监测成果数据为基础,利用地理信息系统(Geographic Information System,GIS)、遥感(Remote Sensing,RS)、Web等技术建成省域自然资源遥感动态监测服务平台,实现遥感监测成果数据入库、管理、统计分析等一体化管理与应用,提高土地执法、耕地保护等自然资源监测信息化水平,提升遥感监测成果管理应用与决策分析能力。
文摘基于FTP(File Transfer Protocol)服务开发了省域遥感影像即时服务管理平台,根据更新区域的矢量数据拓扑分析得到需要更新的子节点服务器信息。通过FTP服务实现瓦片数据的在线传输并结合瓦片融合技术完成地图瓦片的更新,实现了不同服务器间ArcGIS Server地图服务的联动更新。
文摘本文研究了具有通信带宽约束的多传感器网络系统的多速率状态分布融合估计。对于多速率采样数据系统,提出了一种新的扩充方法,将多速率采样数据系统转换为单速率系统。首先,为了满足有限的通信带宽,采用降维策略只允许局部估计信号的部分分量发送到融合中心(fusion center,FC),同时给出了一种补偿策略来补偿每个分量的未发送分量。然后,对于由多速率传感器产生的局部状态估计,借助顺序快速协方差交叉(sequential fast co⁃variance intersection,SFCI)方法,提出了一种新的融合估计方法。最后,提供了一个对导航系统定位追踪的仿真实例,验证所提出的分布式融合估计方法的有效性。
基金supported by the National Natural Science Foundation of China(51977061,51407063,61903129)Open Foundation of Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System(HBSEES202205)。
文摘Optimized fin arrangement and dimension of heat exchanger can improve the maximum output power of thermoelectric generator(TEG)system which converts the wasted heat into electricity with thermoelectric modules(TEMs).Considering that the geometric symmetry contributes to the temperature uniformity improvement and convenient TEMs arrangement,a low-backpressure TEG system based on a polyhedral-shape heat exchanger was developed.To assess the effect of inner topology and fin parameters on the heat transfer and output power of the TEG system,a realizable k-?turbulence based numerical model was established and validated to perform numerical simulations.The results demonstrate that increasing fin length,fin width and fin intersection angle are beneficial to the average surface temperature,temperature distribution uniformity and maximum output power of the TEG system.Moreover,decreasing fin spacing distance contributes to the enhanced average surface temperature and maximum power of TEG system,and has insignificant effect on its temperature uniformity.The inserted fins with optimal length,width,intersection angle and spacing distance enhance higher output power,whereas result in increasing backpressure.The maximum difference between the experimental and simulation results is 3.2%,which validates the feasibility of the established numerical model.It also provides a theoretical reference to the optimal design and performance analysis of low-backpressure TEG systems used in automobile exhaust heat recovery.
