On the origin of the scatter around the Fundamental Plane: correlations with stellar population parameters     

A. Gargiulo  C. P. Haines  P. Merluzzi  R. J. Smith  F. La Barbera  G. Busarello  J. R. Lucey  A. Mercurio  M. Capaccioli 《Monthly notices of the Royal Astronomical Society》2009,397(1):75-89

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Monitoring supergiant fast X-ray transients with Swift: results from the first year     

P. Romano  L. Sidoli  G. Cusumano  V. La Parola  S. Vercellone  C. Pagani  L. Ducci  V. Mangano  J. Cummings  H. A. Krimm  C. Guidorzi  J. A. Kennea  E. A. Hoversten  D. N. Burrows  N. Gehrels 《Monthly notices of the Royal Astronomical Society》2009,399(4):2021-2032

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The spectrum and position of solar noise storms at decameter wavelengths     

Jérôme De La Noë  Tomas E. Gergely 《Solar physics》1977,55(1):195-209

Decametric storm radiation during the period July–August 1970 has been observed simultaneously with a high sensitivity spectrograph at Arecibo Observatory and with the log-periodic, swept-frequency array of the Clark Lake Radio Observatory. The observations complement each other; different types of fine structure emissions can be easily identified on the spectrograph records and their position can be determined from the swept-frequency recordings. We study the relative positions of the different emissions which have been observed during the storms. Four distinct sources appeared to be present. The continuum emission, the type I bursts and the flare-related type III's were all emitted at different locations. The storm type III bursts, type IIIb's and drift pairs overlapped in position, but appeared at different locations than the previously mentioned sources.On leave of absence from Instituto Argentino de Radioastronomia, Argentina.  相似文献   

Umbral dots: A case of penetrative convection between sunspot fragments     

J. I. García De La Rosa 《Solar physics》1987,112(1):49-58

A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature spots result from the subphotospherically controlled attraction of several large fragments of 1–2 × 10²¹ Mx, which are themselves made of smaller elements. The fragments are more stable structures than the spots they constitute; and usually survive after the spot decay. In the process of coalescence of fragments to form the spot, the fusion is never complete and properly exposed photographs reveal light bridges or saddle-like distributions of umbral dots in the interstices between fragments. These are also the regions along which the break up of the spot occurs. For us, these observations fit within the expectations of the penetrative convection mechanism for umbral dots proposed by Parker (1979b).  相似文献   

Sunspot populations and their relation with the solar cycle     

J. I. García De La Rosa 《Solar physics》1981,74(1):117-123

The joint consideration of theoretical and observational arguments is used to conclude that two different spot populations co-exist in the Sun.Proceedings of the 14th ESLAB Symposium on Physics of Solar Variations, 16–19 September 1980, Scheveningen, The Netherlands.  相似文献   

基于空间数据库的多媒体图形查询信息系统研究——以苏州河环境综合整治为例   总被引：5，自引：2，他引：5  

张立峰  许有鹏  孙亚梅  王腊春  马劲松 《地理研究》2002,21(3):365-372

本文介绍作者自行开发的GIS软件系统———基于空间数据库的多媒体图形查询信息系统的内容、结构和功能 ,以及在环境规划管理方面的应用。阐明了系统可满足决策管理层和公共信息发布层等不同层次的应用需求 ,对环境工程项目的规划管理可作为示范和借鉴。说明本系统除具有一般GIS系统所具有的功能外 ,还把现代多媒体技术和GIS空间数据库技术结合起来 ,实现了在空间数据基础上的多媒体信息查询 ,丰富了GIS中属性数据查询的内容 ,提高了地图的可视性。详细介绍了一种地理信息系统的空间分析方法———包含分析的算法和在本系统中的具体应用———按多边形区域进行空间相关性关系查询。  相似文献   

近42年西藏高原雅鲁藏布江中游夏季气候趋势和突变分析   总被引：32，自引：10，他引：32  

周顺武  假拉  杜军 《高原气象》2001,20(1):71-75

根据1957－1998年雅鲁藏布江中游拉萨、日喀则、泽当、江孜4个站6－8月的平均气温、降水资料，通过线性趋势估计和多项式函数拟合等方法分析了雅鲁藏布江中游地区夏季气候长期趋势变化和周期变化，并利用滑动T检验等方法讨论了突变的问题。结果表明：在过去42a里，该流域夏季气温有明显的上升趋势，1980年突变增暖非常明显；而夏季降水呈下降趋势，60年代中后期至80年代末降水普遍偏少，90年代降水出现回升势头。气温、降水的主要周期集中在高频波段，显著周期为2．8－3．5a。  相似文献   

气候变化对滦河流域水资源影响的水文模式模拟(Ⅰ)降水径流模式系统（PRMS）介绍及其在滦河流域的移植   总被引：1，自引：4，他引：1  

范广洲  吕世华  程国栋 《高原气象》2001,20(2):173-179

简单介绍了引进美国地质勘查中心发展的降水径流模式系统（PRMS）。认为PRMS模式具有多种模拟功能，包含的物理过程也较全面，是当前世界上较好的水文学模式。将PRMS模式系统移植到滦河流域，并对其模拟能力进行了初步检验。结果表明，模式系统在我国滦河流域的移植比较成功，而且能够较真实地再现滦河流域河川径流量及水资源其它分量的年际及季节变化，也可以用于研究气候变化对滦河流域水资源的影响。  相似文献   

论珠江三角洲与外围地区的互补性   总被引：5，自引：0，他引：5  

吕拉昌 《热带地理》2002,22(2):161-165

互补性是珠三角洲与外围地区实现共同发展的重要基础。文中从资源、产业及商品交流的角度，全面分析了珠江三角洲与外围地区的互补性关系，并指出要充分利用这种互补性关系，加强区域要素的交流与合作，走区域整合的发展道路。  相似文献   

Evidence of a major environmental change recorded in a macrotidal bay (Marennes-Oléron Bay, France) by correlation between VHR seismic profiles and cores     

Isabelle Billeaud  Eric Chaumillon  Olivier Weber 《Geo-Marine Letters》2005,25(1):1-10

New, very high-resolution (25 cm) seismic profiles have revealed the internal architecture of the infilling of a macrotidal bay, the Marennes-Oléron Bay, France. Within this geometry, a major seismic unconformity has been correlated with core data. This correlation provides evidence that the seismic unconformity corresponds to a sharp grain-size decrease. Both seismic and core data indicate that this change of grain size can be interpreted as a record of a recent (around 1,000 years b.p.) decrease in hydrodynamical energy with time and/or a larger supply of fine-grained material. This recent environmental change can be related to natural infilling of the Marennes Oléron Bay, and to tidal prism decrease, increasing human activities (e.g. land reclamation, deforestation, agricultural land use) and climate fluctuations during the late Holocene, such as the transition between the cold period of the Dark Ages (1,550–1,050 years b.p.) and the Medieval warm period (1,050–550 years b.p.).  相似文献