地质图形处理系统设计

介绍了地质图形计算机处理系统的系统功能、系统结构、图形数据库结构以及图形生成与编辑;讨论了在开发地质图形计算机辅助设计或绘图系统时,应如何体现专业特点,如何在数据中表达地质现象的地层和构造意义,如何在地质模型建立中融入专业人员的地质背景知识,以及怎样设计出实际有效的地质图形处理软件系统等问题。     

地测信息系统及其应用

介绍了一个专门为地测部门设计和开发的软件系统——地质、测量信息系统(MSGIS)的应用范围、主要功能,并以系统的具体操作为主线阐述了系统的用户界面、输入输出接口、图形生成、地测图形的自动处理和3D地测模型。     

Middle to Upper Eocene ostracofauna of central Tunisia and Pelagian Shelf: examples of Jebel Bargou and the Gabes Gulf

Studies on ostracofauna gathered from the Middle–Late Eocene outcropping series of Jebel Bargou anticline, central Tunisia and from an offshore well in the Pelagian Shelf (ABR1) allowed to date major biostratigraphic limits and contribute to improve the precision on the present Eocene biozonation scheme based specially on the planktonic foraminifera markers. Paleogeographic and paleoecological interpretation was derived from an analysis of 60 ostracod species belonging to 38 genera coupled to lithostratigraphic facies interpretation. Ostracods associations indicate an evident similarity between the studied sections with circalittoral taxonomic dominance. In large scale, the ostracofauna recognized in the studied sections shows plentiful similarities with those of Northern Africa and the Middle East regions (Libya, Mauritania, Egypt, Jordan, and Sicilia). The similarities with the genera from Nigeria, Ghana, and Togo are rare and totally absent with those of European margin. Accordingly, during the Middle to Late Eocene, marine connection is evident between Northern Africa and the Middle East, probable between Northern Africa and eastern Africa and totally absent between Northern Africa and European margin because ostracods similarities are absent between European and Tunisian ostracods we were identified except some cosmopolitan forms.     

永久散射体干涉测量中最佳主图像选取

以系统热噪声、时空基线、季节性变化和多普勒质心频率作为影响因子,建立主图像选取函数,根据生成相干系数矩阵预测最佳主图像,并利用拉斯维加斯地区的数据实际处理结果对该方法的预测结果进行验证.结果表明该方法能够准确地预测PSInSAR数据处理中不相干图像个数以及图像之间的相干系数,为最佳主图像的选取提供可靠的参考依据.     

气象影视节目制作中设备的综合运用

文章通过一段气象节目制作的实例,浅析了气象影视节目制作中各种主要设备的综合使用及切换台和非线性编辑系统的主要工作原理.     

济青高速公路大雾天气气候特征及其影响

利用济青高速公路沿线13个气象站1971～2000年的地面观测资料，分析了济青高速公路沿线大雾天气的天气气候特征，发现：济青高速公路沿线大雾天气不仅具有明显的年际变化，而且具有明显季节、昼夜和地域差异，并在此基础上将不同路段大雾服务划分为特别关键期、关键期、次关键期。结合实际交通气象服务的需要，将大雾天气对于高速公路的影响划分为4个等级，并提出了未来开展高速公路大雾服务的设想。     

Grain size characteristics of superficial sediments of the Gulf of Tunis (NE Tunisia)

This work presents a recent grain size study characterizing superficial sediments of the whole sectors of the Gulf of Tunis which extends from Sidi Ali El Mekki to Sidi Daoued. In this study, a total of 112 samples were collected from different depths following 26 profiles perpendicular to the shore and from rivers. The determination of the proportions of coarse and fine fractions and the interpretation of the grain size results lead to dividing the Gulf of Tunis into two principal coasts: (1) the western coast situated between Sidi Ali El Mekki and Borj Cédria, which is characterized by three sedimentary facies: (a) a sandy facies along the coastline, (b) a mixed facies between Ghar El Melh and Raoued, near the Medjerda River, and between La Goulette and Ezzahra, near the Miliane River, and (c) a muddy facies between Ghar El Melh and Kalâat El Andalous and covered by fine to very fine sands, and (2) the eastern coast, which is characterized by a sandy facies and covered by medium to coarse sands. The dominant N–E and N–W waves generate longshore currents that provide sediment transport following the directions N–S, from Sidi Ali El Mekki to Kalâat El Andalous; SE–NW, from Gammarth to Raoued; NE–SW, from Sidi Bou Saïd to La Goulette and from Sidi Daoued to Bir El Jadi; SE–NW, from Hammam-Plage to Ezzahra; and SW–NE, from Port aux Princes to Rtiba.     

Coupling Effect of Riser on Integrated FPS in Deepwater Area

The main challenge in predicting global responses of floating vessels in deepwater and ultra-deepwater areas comes from the system's coupled effect.In this paper,the coupled approach is used to analyze effects of riser on floating system in deepwater.The analysis results show that the coupling effects of risers will mainly affect the low frequency (LF) motions of the system.That is because risers will provide the system with a significant low frequency (LF) damping which will vary with the sea states.Under ...