太阳剧烈活动与空间灾害天气

剧烈太阳活动和空间灾害天气的研究 ,是当代空间科学中最前沿、最具挑战性和最能造福人类的课题。这一研究将揭示太阳活动的成因、证认太阳活动和空间灾害天气的因果联系 ,在天文、空间和地球科学交叉领域取得实质性的学科进步 ,为实施我国国家空间天气计划提供坚实的科学基础 ,为发展我国空间科学探测准备新的概念和思路。本文评述了国家基础研究重点规划 (973)项目“剧烈太阳活动与空间灾害天气”的研究进展、科学机遇和进一步努力方向。     

北半球大气臭氧与太平洋海温时空相关分析

本文利用北半球臭氧网格点资料和太平洋海温网格点资料,通过自然正交函数展开(EOF)和谱分析,讨论了臭氧变化与太平洋海温异常的时空结构对应关系及相互联系,得到了一些有意义的结果。     

当今中国地球物理学发展的机遇、空间和挑战

在二十一世纪的今天,中国正处在快速工业化和经济腾飞的重要时刻,在这世界经济和科学技术突飞猛进的大潮中,对地球物理学来说确是机遇,并展现出多维的发展空间,同时也面临着严峻的挑战。为此,国家战略需求和自主创新已成为中华民族能否独立于世界民族之林的最强音!在这一前提下,地球物理学家就必须超越已有的框架,穿过地平线,全方位的去研究、探索、揭示、发现地球内部的奥秘。研究结果表明,人们必须清晰地认识到:在新的世纪里地球物理学的发展导向,即地球物理学的前沿领域和深化研究与现代科学技术进步的制约;地球物理学必须牢牢地把握住向高层次的综合研究脉络方能有所发现与突破;地球物理学所面临的机遇、发展空间和挑战;地球内部圈层结构与大陆动力学研究的主体内涵和导向。     

吉林新立油田下白垩统泉头组成岩储集相及储集空间演化

吉林新立油田位于吉林省松原市郭县以北新庙乡境内。综合应用25口取心井薄片、镜质体反射率、铸体、电镜、X衍射等岩心分析资料，研究了泉头组的成岩作用、成岩演化序列、成岩阶段划分及储集空间类型。根据成岩作用及特有的储集空间组合，划分了4种成岩储集相类型，即A相(不稳定组分强溶解次生孔隙成岩储集相)、B相(中等压实弱-中胶结混合孔隙成岩储集相)、C相(强压实中等胶结残余粒间孔成岩储集相)、D相(碳酸盐强胶结微孔隙成岩储集相)；并阐述了各类成岩储集相的特征，其中A相储集物性最好，B相次之，C相较差，D相最差。最后探讨了泉头组储集空间演化，在中成岩阶段A期形成了大量次生溶蚀孔隙，为首次在该区泉头组特低渗储层中预测相对有利的成岩储集相带提供了研究思路和科学依据，也为改善特低渗油田的开发效果奠定了坚实的地质基础。     

Features of discrete VLF emissions observed at Gulmarg,India during the magnetic storm of 6–7 March, 1986

During the analysis of archived VLF data from Indian low latitude ground stations, some discrete VLF emissions recorded at the low latitude ground station Gulmarg (geomagnetic latitude 24°26′N; geomagnetic longitude 147°09′E, L = 1.28) during moderate magnetic storm activity (Σ K _P ⁻ = 32, K _P index varies from 4 to 6 during the observation period) on 6/7 March, 1986 are presented in this paper. The dynamic spectra of these discrete VLF emissions were observed along with tweeks and its harmonics, which is interesting and complex to explain. In most of the events the harmonic frequency of tweeks correlates with the starting frequency of harmonics of discrete emissions. In order to explain the observed features of discrete VLF emissions, we propose cyclotron resonance interaction between whistler mode wave and energetic electrons of inner radiation belt as possible generation mechanism. An attempt is also made to determine parallel energy, anisotropy and wave growth relevant to the generation process of VLF emissions.     

Fractured space: a geographical reflection on the digital divide

What does it mean to reflect upon space in connection to telecommunications? If we start with a conception of urban space as being fully integrated, including on an equal footing both information and communication technologies (ICT) and mobility techniques, as well as the founding notion of copresence that we find at the heart of all urban organization, we might then be able to examine the notion of the ‘digital divide’ in a new light. This clearly experimental approach is conducted by a research group called ‘Urbatic’, which is composed of geographers who, for the last three years, have been conducting theoretical research whose objective is to take into account two fields of social science: the theory of urbanity and the theory of telecommunication. Surveys conducted in this perspective focus on the analysis of the choices people make between the different means they can use to cope with distances (copresence, mobility and telecommunication) with a view to constructing their own space. The analysis of these choices leads us to propose a new theorized interpretation of the ‘digital divide’.     

卫星编队——下一代空间光学遥感发展的方向

编队飞行是多颗卫星在共同控制律下动力学状态的耦合。利用卫星编队来实现光学稀疏孔径,是下一代空间光学遥感发展的新方向。阐述了光学稀疏孔径的概念及成像原理,讨论了空间光学遥感成像的干涉模式选择问题,并分析了菲索干涉对卫星编队的要求。     

网络导航服务系统的设计与实现

介绍了自主导航技术并提出了不足之处,设计了网络导航系统,实现了一个适合移动设备的网络导航服务系统应有的功能.     

Edge Enhancement for Remote Sensing Image Using Norm Algorithm in L2 Vector Space

The Householder transformation-norm structure function in L2 vector space of linear algebra is introduced, and the edge enhancement for remote sensing images is realized. The experiment result is compared with traditional Laplacian and Sobel edge enhancements and it shows that the effect of the new method is better than that of the traditional algorithms.