Investigation of an energy nonadditivity for nonextensive systems

We investigate the energy nonadditivity relationship E(AαB) = E(A) + E(B) + αE(A)E(B) which is often considered in the development of the statistical physics of nonextensive systems. It was recently found that α in this equation was not constant for a given system in a given situation and could not characterize nonextensivity for that system. In this work, we select several typical nonextensive systems and compute the behavior of α when a system changes its size or is divided into subsystems in different fashions. Three kinds of interactions are considered. It is found by a thought experiment that α depends on the system size and the interaction as expected and on the way we divide the system. However, one of the major results of this work is that, for given system, α has a minimum with respect to division position. Around this position, there is a zone in which α is more or less constant, a situation where the sizes of the subsystems are comparable. The width of this zone depends on the interaction and on the system size. We conclude that if α is considered approximately constant in this zone, the two mathematical difficulties raised in previous studies are solved, meaning that the nonadditive relationship can characterize the nonadditivity of the system as an approximation. In all the cases, α tends to zero in the thermodynamic limit (N→∞) as expected.     

卫星导航系统精度试验分析的设计与实现

导航系统精度（NSP,Navigation System Precision）分析是卫星导航系统定位、测速和授时性能仿真分析与评估的重要组成部分,NSP的可用性和连续性是导航系统服务能力的重要标志之一。研究了NSP的相关概念,分析了NSP的可用性和连续性算法,在此基础上提出了面向卫星导航系统的NSP仿真模型框架,并基于此框架设计和实现了支持NSP分析的插件工具,最后针对格网分辨率为5°×5°的区域格网进行了NSP的仿真试验分析,验证了提出的仿真模型框架和设计的插件工具的正确性。

Abstract：

Navigation System Precision Analysis is a part of the simulation analysis and evaluation of the Navigation System＇s performance on positioning,velocity-measuring and time-telling,and the availability and continuity of NSP is an important symbol of service capability of the navigation system. The NSP concept was introduced firstly,and then algorithms of the availability and continuity of NSP were researched,based on these,model architecture of the NSP was proposed and the NSP simulation analysis system was designed and implemented,finally,the simulated experiment of the grid with 10 resolution was implemented and the system architecture and the plug-in facility were testified.     

DMSP夜间灯光数据与Landsat数据结合的建成区提取研究——以江西省为例

建成区面积代表着城镇用地水平和发达程度,其变化反映了城市扩张强度和经济发展水平.该文以江西省为研究区域,提出了一种Landsat TM/ETM＋光学遥感影像与DMSP/OLS(Defense Meteorological Satellites Program/ Operational Linescan System)夜光数据相结合的建成区提取方法,提取精度达到89.7%;利用长时序提取结果分析了江西省1995年～2014年的城市建成区扩张情况,结果表明江西省近20 a间建成区面积增加了1 276.33 km2,扩张率达423.99%.综合分析建成区提取结果与经济统计指标,结果显示江西省的建成区面积扩张与经济发展存在显著正相关关系(R2＝0.62);鄱阳湖生态经济区建立后,区域内城市的建成区建设速度和经济发展速度明显加快.