房价小跌怡情

全球经济刚刚从“急救室”里推出来,中国的房地产市场却仍在“高烧”。一些本该用于企业主业的资金被持续投入房地产市场,这些企业的CFO目前的要务,是给自己的决策层适当“降温”。     

漫谈阴谋论

华尔街,这条还不到五百米的狭窄的街道,掌控着全球金融的命脉;它经历了战火的洗礼,恐怖的袭击,却依然站立在世界金融的最高峰不断缔造＂神话＂。     

Empirical Analysis and Modeling of the Global Economic System

In the global economic system, each economy stimulates the growth of its gross domestic products （GDP） by increasing its international trade. Using a fluctuation analysis of the flux data of GDP and foreign trade, we find that both GDP and foreign trade are dominated by external force and driven by each other. By excluding the impact of the associated trade dependency degree, GDP and the total volume of foreign trade collapse well into a power-law function. The economy＇s total trade volume scales with the number of trade partners, and it is distributed among its trade partners in an exponential form. The model which incorporated these empirical results can integrate the growth dynamics of GDP and the interplay dynamics between GDP and weighted international trade networks simultaneously.     

Response of the Earth＇s Magnetosphere and Ionosphere to Solar Wind Driver and Ionosphere Load： Results of Global MHD Simulations

Three-dimensional global magnetohydrodynamic simulations of the solar wind-magnetosphere-ionosphere system are carried out to explore the dependence of the magnetospheric reconnection voltage, the ionospheric transpolar potential, and the field aligned currents （FACs） on the solar wind driver and ionosphere load for the cases with pure southward interplanetary magnetic field （IMF）. It is shown that the reconnection voltage and the transpolar potential increase monotonically with decreasing Pedersen conductance （∑ p ）, increasing southward IMF strength （Bs） and solar wind speed （Vsw）. Moreover, both regions 1 and 2 FACs increase when Bs and vsw increase, whereas the two currents behave differently in response to ∑p. As ∑p increases, the region 1 FAC increases monotonically, but region 2 FAC shows a non-monotonic response to the increase of ∑p ： it first increases in the range of （0,5） Siemens and then decreases for ∑p 〉 5 Siemens.     

国家自然科学基金委化学科学部分析化学学科介绍

分析化学在科学技术中不可或缺的作用和地位已是毋庸置疑的事实。上个世纪末“人类基因测序”被认为是一项像人类登月一样的伟大工程,在该工程面临进展缓慢的困难时,是分析化学家对毛细管电泳分析方法的重大革新,使这项伟大的工程得以提前完成,从而揭开了后基因时代的序幕。1999年比利时布鲁塞尔发生的二嗯英污染中毒事件引起全球消费者的恐慌,导致比利时内阁被迫集体辞职。     

Global Synchronization of General Delayed Dynamical Networks

Global synchronization of general delayed dynamical networks with linear coupling are investigated. A sufficient condition for the global synchronization is obtained by using the linear matrix inequality and introducing a reference state. This condition is simply given based on the maximum nonzero eigenvalue of the network coupling matrix. Moreover, we show how to construct the coupling matrix to guarantee global synchronization of network, which is very convenient to use. A two-dimension system with delay as a dynamical node in network with global coupling is finally presented to verify the theoretical results of the proposed global synchronization scheme.     

现代全球板块边界的分形特征

本文利用分形几何理论对现代全球板块边界进行了系统的分维值的测量与计算，总结出了离散介、聚敛介和转换边界的分形特征，并进一步论述了其所对应的板块边界几何复杂程度、发育程度、构造活动性和力学性质的相关性。     

全球地震构造系统与地球的非对称性

本文主要讨论全球地震构造系统与现今地球非对称动力系统的关系。全球地震构造可划分为三个非对称系统:环太平洋地震构造系,洋脊地震构造系,北大陆地震构造系。地球非对称性还表现为南、北半球的非对称,大西洋半球与太平洋半球的非对称和经向构造东、西两侧的非对称。全球非对称动力系统可能由经向对流、纬向对流和由地球转速变化产生的惯性流组成,它们构成了地球非对称性的动力学背景,并控制了全球地震构造系统的格局。     

《应用数学和力学》投稿指南北大核心CSCD

1.我刊主要刊登力学、力学中的数学方法和与现代力学紧密相关的应用数学方面的高水平学术论文,同时刊登土木建筑、水利水工、道路桥梁、航海造船、航空航天、机械冶金、国防军工、防灾减灾、能源环保、生物化工等领域中力学和数学建模、分析方面具有学术水平和实用价值的论文。来稿务求观点明确、论据可靠、数字准确、文字精练,推导从简,给出主要成果和结论。     

基于GIS的土壤墒情监测系统

为了直观查看土壤的墒情,用水分传感器作为数据采集模块;WEB开发技术设计了监测中心模块;GSM网络作为数据传输的模块;采集到的数据传输到监测中心数据库中,监测中心对数据进行处理,将处理后的数据直观的显示在GIS地图上,监测人员根据GIS地图不同区域显示的颜色判断干旱程度,并发布预警信息。测试数据显示,能够清晰、直观、实时的查看不同区域的土壤墒情。