集群系统进程迁移机制研究   总被引：1，自引：0，他引：1  

黄嵘  苗放 《物探化探计算技术》2002,24(3):273-278,283

进程迁移是提高集群系统整体性的基础机制之一。作者在本文中首先详细地论述了进程迁移机制的关键技术，然后描述了在集群系统中PVM迁移原理，接着重点分析了在Linux集群中进程迁移算法的设计，最后对集群系统中与进程迁移机制相关的技术做了讨论。  相似文献   

松辽盆地地下流体地球化学特征研究   总被引：9，自引：1，他引：9  

楼章华  姚炎明  金爱民  蔡希源 《矿物学报》2002,22(4):343-349

松辽盆地地下水动力场具有明显的不对称性：以盆地北端为主的盆地边缘是大气水下渗－向心流区；中央坳陷区为泥岩压实排水－离心流区；盆地南部以越流－蒸发泄水为主，只有盆地边缘和隆起的局部地区有间断性的大气水下渗作用。地下水动力场的基本特征决定了地下水化学场的分布规律。在成岩过程中，各种成岩反应具有不同程度的阶段性。离子的迁移与矿物转变、溶解和自生矿物的沉淀有关。深入研究砂岩的成岩反应，是分析孔隙水演化过程中离子迁移的重要环节。通过分析①成岩自生矿物中流体包裹体；②自生矿物的同位素组成；③成岩自生矿物的种类和序列；以及④地下水化学成分，可以进一步研究地下流体地球化学特征。  相似文献   

Imagining difference: the experiences of 'transnational' Indian IT professionals in Germany     

Louise Meijering  Bettina van Hoven 《Area》2003,35(2):174-182

In this paper we explore the motivations to migrate and the migration experiences of 22 Indian IT professionals in Germany. When studying skilled migration, Germany is an interesting case as it struggled with waves of extreme right activities whilst trying to attract IT professionals from outside the European Union at the same time. In this context, we are interested in the conflicts that the migrants may experience as a result of their desire or obligation to move, their specific cultural baggage and the way in which they encounter the different sides of German society.  相似文献   

Accelerating seismicity of moderate-size earthquakes before the 1999 Chi-Chi, Taiwan, earthquake: Testing time-prediction of the self-organizing spinodal model of earthquakes     

Chien-chih Chen 《Geophysical Journal International》2003,155(1):F1-F5

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Interprétation hydrogéologique de l'aquifère des bassins sud-rifains (Maroc) : apport de la sismique réflexion     

Lahcen Zouhri  Christian Gorini  Christian Lamouroux  Daniel Vachard  Mohammed Dakki 《Comptes Rendus Geoscience》2003,335(3):319-326

The aquifer of the Rharb Basin is constituted by heterogeneous material. The seismic reflexion interpretation carried out in this area, highlighted a permeable device compartmentalized in raised and subsided blocks. Depressions identified in the northern and southernmost zones are characterized by Plio-Quaternary fillings that are favourable to the hydrogeological exploitation. Two mechanisms contribute to structure the Plio-Quaternary aquifer: the Hercynian reactivation in the southernmost part, and the gravitational mechanism of the Pre-Rifean nappe. The groundwater flow and the aquifer thickening are controlled by this reactivation.  相似文献   

Formation and water environmental evolution of the Nansihu Lake     

ZHANG Zulu  SHEN Ji  LIU Enfeng  SUN Qingyi  JIANG Luguang  WANG Lin 《地理学报》2003,13(2):241-249

Through high-resolution research of sedimental chronology and the sediment environmental indexes, such as graininess, minerals, magnetic parameters, pigment content, organic carbon and chronology in Ds-core and Ws-core in Nansihu Lake, the authors analyze the formation cause of the Nansihu Lake and its water environmental changes. Historical documents are also analyzed here in order to reach the conclusion. Researches indicate that the Nansihu Lake came into being about 2500 aBP and its evolution succession can be divided into four stages. In this evolution process, several scattered lakes merge into one large lake in the east of China. This process is distinctively affected by the overflow of the Yellow River, the excavation of the Grand Canal and other human activities.  相似文献   

根据土壤化学特征划分伏牛山亚热带北界   总被引：1，自引：0，他引：1  

马建华  许叔明  韩晋仙  ZHU Lianqi  Zhao Qingliang 《地理学报(英文版)》2003,13(3):299-304

The boundary between subtropical zone and temperate zone is not only important in physical geography, but also attractive in agricultural production. Seven soil profiles studied in this paper are placed along the southern slope of Funiu Mountain at different heights above sea level.Many compositions and properties of these soils have been determined in laboratory. In this paper,the laws of migration and accumulation of soil materials on the southern slope of Funiu Mountain are discussed first, then the division of the boundary between subtropical zone and temperate zone in this area according to soil geochemistry is discussed with qualitative methods and mathematical classification method in which twelve selected indexes such as Km, Saf, Ba, β, Feo/Fet, Mno/Mnt and so on are used. The result indicates that the boundary between subtropical zone and temperate zone on the southern slope of Funiu Mountain is about 950 m above sea level.  相似文献   

Fluid Households,Complex Families: The Impacts of Children's Migration as a Response to HIV/AIDS in Southern Africa*     

Lorraine Young  Nicola Ansell 《The Professional geographer》2003,55(4):464-476

The fluidity of southern African families is related to a long history of internal and external migration. Currently, HIV/AIDS is having a dramatic impact on extended family structures, with the migration of individual members employed as a coping strategy. Children's migration is one aspect of this that is often distinct from that undertaken by other household members. This article is based on qualitative research conducted in Lesotho and Malawi with young migrants and the households that receive them. It examines the processes of fragmentation and re‐formation of households through the movements of children that are taking place in response to HIV/AIDS, and explores the impacts these processes have on young migrants and the households they join.  相似文献   

500年来中国东部雨带的南北摆动   总被引：4，自引：0，他引：4  

董安祥  冯松  张存杰 《气象学报》2002,60(3):378-382

研究表明 ,在世纪时间尺度上 ,14 70年以来 ,在 10 8°E以东、4 0°N以南的中国东部发生了 7次多雨和 7次少雨过程 ,它们都最先从中国北方开始 ,然后是江淮地区 ,华南地区出现最迟。中国温度高时 ,多雨区偏南 ,温度低时 ,多雨区偏北。中国多雨区自北向南的位相差异可能与Hadley环流的变化有关。气候的自然变化对近几十年来中国北方的干旱和近十几年来长江流域的多雨仍起着主要作用  相似文献   

Biophysical impacts of climate change on bird populations and migration in Lithuania     

Mecislovas Zalakevicius 《GeoJournal》2002,57(3):183-193

This paper presents data obtained from studies of the dependence of different migratory processes - spring arrival, migratory take-off, spring and autumn en route migration–upon climate change in Lithuania. The article confirms the impact of global climate warming on different breeding bird species and populations, changes in their ranges and population state, and their staging and wintering areas. The list of bird species which are shifting their ranges north-eastward or eastward in the Baltic region under the influence of global warming is presented. It was established that the impact of global climate change upon birds of terrestrial and wetland complexes is more evident than upon waterfowl. Attention is focussed on the practical importance of the global climate change impact on environmental protection and different branches of the economy. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献