Sand-dust storm is a type of disastrous weather, typically occurring in arid and semi-arid climates. This study selected a region in the hinterlands of the Taklimakan Desert, called the Tazhong region, as the experime...Sand-dust storm is a type of disastrous weather, typically occurring in arid and semi-arid climates. This study selected a region in the hinterlands of the Taklimakan Desert, called the Tazhong region, as the experimental area to quantitatively estimate the particle concentrations of sand-dust storms using the boundary layer wind-profiling radar. We thoroughly studied the radar echo signals and reflectivity factor features during the sand-dust storms. The results indicate that（1） under sand-dust storm conditions, boundary layer wind-profiling radar cannot capture the complete information regarding horizontal wind velocity and direction, but it can obtain the backscattering intensity of sand-dust storms; and（2） during sand-dust storms particle size distributions in the surface layer closely resemble log-normal distributions, with sand-dust particles sizes of 90–100 μm accounting for the maximum particle probability. Retrieved particle size distributions at heights of 600, 800, and 1000 m follow log-normal distributions, and the expected value of particle diameter decreases gradually with increasing height. From the perspective of orders of magnitude, the retrieved results for particle number concentrations and mass concentrations are consistent with previous aircraft-detected results, indicating that it is basically feasible to use boundary layer wind-profiling radar to quantitatively detect the particle concentrations of dust storms.展开更多
通过对LTE分组核心MME信令流量分析,结合ATCA硬件系统Red Hat Enterprise 6.5软件平台和优化了MME网元信令流量,设计了信令优化负载均衡的MME网元:包括网络接口层、协议解析层和应用功能层设计。信令流量优化设计包括:信令汇聚模型和动...通过对LTE分组核心MME信令流量分析,结合ATCA硬件系统Red Hat Enterprise 6.5软件平台和优化了MME网元信令流量,设计了信令优化负载均衡的MME网元:包括网络接口层、协议解析层和应用功能层设计。信令流量优化设计包括:信令汇聚模型和动态管理权重列表。通过过滤整合频繁的信令接入消息并优化权重列表防止频繁移动切换并减少信令量。通过MME信令流量优化设计,LTE分组核心MME网元可以降低信令风暴,均衡信令流量,提高了网络的数据传输率。展开更多
基金supported by the National Natural Science Foundation of China (41775030, 41575008, 11302111, 11562017)the China Research Foundation for Desert Meteorology (SQJ2014003)the China Postdoctoral Science Foundation
文摘Sand-dust storm is a type of disastrous weather, typically occurring in arid and semi-arid climates. This study selected a region in the hinterlands of the Taklimakan Desert, called the Tazhong region, as the experimental area to quantitatively estimate the particle concentrations of sand-dust storms using the boundary layer wind-profiling radar. We thoroughly studied the radar echo signals and reflectivity factor features during the sand-dust storms. The results indicate that（1） under sand-dust storm conditions, boundary layer wind-profiling radar cannot capture the complete information regarding horizontal wind velocity and direction, but it can obtain the backscattering intensity of sand-dust storms; and（2） during sand-dust storms particle size distributions in the surface layer closely resemble log-normal distributions, with sand-dust particles sizes of 90–100 μm accounting for the maximum particle probability. Retrieved particle size distributions at heights of 600, 800, and 1000 m follow log-normal distributions, and the expected value of particle diameter decreases gradually with increasing height. From the perspective of orders of magnitude, the retrieved results for particle number concentrations and mass concentrations are consistent with previous aircraft-detected results, indicating that it is basically feasible to use boundary layer wind-profiling radar to quantitatively detect the particle concentrations of dust storms.
文摘通过对LTE分组核心MME信令流量分析,结合ATCA硬件系统Red Hat Enterprise 6.5软件平台和优化了MME网元信令流量,设计了信令优化负载均衡的MME网元:包括网络接口层、协议解析层和应用功能层设计。信令流量优化设计包括:信令汇聚模型和动态管理权重列表。通过过滤整合频繁的信令接入消息并优化权重列表防止频繁移动切换并减少信令量。通过MME信令流量优化设计,LTE分组核心MME网元可以降低信令风暴,均衡信令流量,提高了网络的数据传输率。
