光盘地图的研究与应用   总被引：2，自引：0，他引：2  

田德森  冯璧华 《地理学报》1992,47(4):361-367

光盘存贮技术的优点是密度高,容量大,存取快,保存长。它给地图学者提供了一种完全新颖的制图介质,为计算机地图制图和地理信息系统的发展开辟了新的前景。本文简要介绍光盘存贮技术的原理与特点,目前光盘地图的研制和应用状况,及其在地图应用方面的潜力。  相似文献   

湖北气温的3—5年周期振动及其与大气环流低频变化的联系     

熊安元  邓先瑞 《热带地理》1996,16(4):319-324

本文用月平均资料序列，提取湖北气温，北半球５００ｈＰａ高度和北太平洋海博温度的３－５年低频分量，分析研究了三者之间的联系，初步揭示了前期ＳＳＴ对湖北冬季气温影响的过程。  相似文献   

北半球夏季500hPa候平均高度场的遥相关和环流特征   总被引：6，自引：0，他引：6       下载免费PDF全文

杨秋明 《大气科学》1993,17(2):148-154

本文用10年(1980—1989)夏季北半球500hPa候平均高度场资料进行遥相关分析,得到东亚太平洋型(EAP)和西欧型(WE)两种遥相关型及西亚-太平洋-大西洋振荡,并对高度场进行主成分分析(PCA),讨论了环流的时空分布特征.  相似文献   

第27届IASPEI大会概况及其主要专题讨论会和研讨会内容汇编     

Members of the SSB Delegation 《国际地震动态》1994,(6)

国际地震学与地球内部物理学协会（ＬＡＳＰＥＩ）第２７届大会于１９９４年元月１０－２１日在新西兰首都惠灵顿的惠灵顿维多利亚大学举行。来自４２个国家的４８３位科学家参加了这次大会。国家地震局派出了以副局长陈为团长的１３人代表团出席会议。本届大会共安排了２７个学术报告会和研讨会，会上宣读论文和报告３９９篇，张贴展示论文约１６０篇。本届ＩＡＳＰＥＩ大会的学术报告会和研讨会涉及广泛的地震学和地球内部物理学研究的前沿问题，内容包括：波在非均匀介质中的传播；地震危险性与地震危害；亚太地区的沉积盆地及其构造背景；地球深部间断面的构造形态和动力学；地震预测；地震层析成像和地幔动力学；俯冲带和弧后盆地；地热在下地壳、岩石学与流变学等方面之作用；区域地震的定位和定量化；毫赫与毫微赫地震学；脊区的地震学详细研究；太平洋的地震和海啸危险性；大小尺度的各向异性；全球地震观测技术的改进；地震的震源模拟和断层力学；诱发地震；非线性地震学；地震运动的地面地质效应；空间大地测量学和实时构造地质学；热流和热液循环；宽频带地震学和震源，等等。  相似文献   

非共轴光学系统传递函数计算     

何对燕 《武汉大学学报(信息科学版)》1988,(3)

用坐标变换计算非共轴光学系统是十分有效的。本文讨论了非共轴光学系统传递函数(OTF)的计算要点,并给出了平行光束传递函数的计算方法。计算了一个无焦系统的波动光学传递函数。  相似文献   

The impact of bio-optical heating on the properties of the upper ocean: A sensitivity study using a 3-D circulation model for the Labrador Sea     

Yongsheng Wu  Charles C.L. Tang  Shubha Sathyendranath  Trevor Platt 《Deep Sea Research Part II: Topical Studies in Oceanography》2007,54(23-26):2630

The impact of bio-optical heating on the properties of the upper Labrador Sea water was investigated by considering changes in light attenuation in water associated with the seasonal change of chlorophyll distribution. The time- and depth-dependent attenuation coefficients were obtained from remotely sensed SeaWiFS ocean-colour data. Sea-surface temperature (SST) and mixed-layer depth (MLD) were computed from a three-dimensional ocean circulation model. The model was integrated from 1999 to 2003 with 6-hourly atmospheric forcing. The changes in SST and MLD attributable to bio-optical heating were determined by comparing the model results using the observed attenuation coefficients (chlorophyll) to those using a weak and constant attenuation (clear water). The model results show that bio-optical heating is controlled mainly by chlorophyll concentration and MLD. The increase in SST is around 1 °C in most parts of the Labrador Sea and the shelves, and up to 2.7 °C in areas of shallow MLD and high chlorophyll concentrations (the Grand Banks and Northeastern Newfoundland Shelf). The increase is much higher than that found in previous studies, which was typically a fraction of a degree. Bio-optical heating also can enhance the stratification of the upper ocean and reduce the MLD by 20–50%.  相似文献   

从第29届IASPEI大会看国际地震预测研究动向   总被引：2，自引：0，他引：2  

朱传镇 《国际地震动态》1998,(4):1-4

第２９届ＩＡＳＰＥＩ大会于１９９７年８月１８～２８日在希腊塞萨洛尼基召开，来自世界６２个国家的１０５０人出席了这次大会。提交大会的论文共１４１１篇，其中口头报告７１６篇，张贴报告６９５篇。该文根据提交大会的有关论文，介绍了国际地震预测研究情况与研究动向。  相似文献   

Relationships between the optical reflectance of coal blends and the microscopic characteristics of their cokes     

S. Pusz  B. Kwieci&#x;ska  A. Koszorek  M. Krzesi&#x;ska  B. Pilawa 《International Journal of Coal Geology》2009,77(3-4):356-362

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Modelling of segment structures: Boudins, bone-boudins, mullions and related single- and multiphase deformation features     

Xavier Maeder  Cees W. Passchier  Daniel Koehn 《Journal of Structural Geology》2009,31(8):817-830

Finite element modelling has been used to simulate the development of segment structures, deformed layer segments separated by veins, such as boudins, mullions, and bone-boudins. A parameter sensitivity analysis is used to compare the influence of the nature of the flow, the relative viscosities of veins in necks and the host rock, and the initial geometry of the layer segments. Parameter fields have been determined for the relative viscosity of veins and layers, and the kinematic vorticity number of flow. Reworked segment structures can have several shapes such as bone-, bulging, shortened bone-boudins and their asymmetric equivalents such as domino- and shearband-boudin geometry. The model for asymmetric reworked segment structures is applied to such features from the Lower Ugab Metaturbidites in NW Namibia. The model suggests that these structures form where the neck veins are stronger than the boudinaged layer, with a significant simple shear component of the bulk flow. The quartz filled necks in the Lower Ugab are therefore stronger than the quartz-rich wall rock in greenschist facies where the progressive deformation occurred. Bone-boudins are usually interpreted to form in transpressional flow, but simulations of the rotation of tension gashes show that they can also form in simple shear or slightly transtensional shear flow.  相似文献   

欧亚大陆冬季地表温度南北反相变化的年代际特征及机理     

李一玲  王澄海  张飞民 《气候与环境研究》2018,23(2):161-175

对欧亚大陆冬季地表温度南北反相的时空分布特征及机理的分析结果表明,欧亚大陆冬季地表温度约以55°N为界存在南北反相变化特征。1961~2015年欧亚大陆冬季地表温度变化具有显著的年际和年代际变化特征;年代际尺度上,北半球行星波"冬三"分布型变化与欧亚大陆地表温度南北反相变化密切联系。冬季欧亚地表温度南北反相变化存在明显的季节内转变。滤除年代际信号和全球变暖趋势后,欧亚大陆冬季地表温度与秋季北极海冰面积之间存在显著相关;北极海冰面积减小是欧亚、尤其中亚地区冬季地表温度降低的主要外强迫因素之一;同期北大西洋"三极子"和欧亚大陆冬季地表温度南北反相变化在年际尺度上存在显著相关。  相似文献