广东地方性氟中毒的类型,分布与防治对策     

周亮津 《广东地质》1993,8(2):21-27

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不同速度模型条件下地震波走时的射线追踪计算     

嘉世旭 《物探化探计算技术》1993,15(3):218-225

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Petroleum Hydrocarbon Distribution Features in Water and Sediment off Fujian Shore   总被引：1，自引：0，他引：1  

王宪  徐鲁荣  李文权  李凌云  钱爱红 《中国海洋湖沼学报》2003,21(2):187-192

This study on the distribution features of petroleum hydrocarbon in water and sedi-ment off the Fujian shore using data obtained from the baseline research on oceanic contamination in Fujian showed that:during the research preiod,petroleum hydrocarbon concentrations in water varied from 5.77μg/L to 37.28μg/L,averaged 14.48 μg/L;was lower in the wet seasson than in the dry season;and was highest in the Minjiang Estuary and Jiulong Estuary in both seasons ,The petorleum hydrocarbon concentrations in shore sediment varied from 14.48 mg/kg to 784.36 mg/kg,averaged 133.3 mg/kg ,and was closely related to sediment types (granularity).  相似文献   

数字水印研究综述及其发展方向   总被引：2，自引：0，他引：2  

陈少霞 《广东海洋大学学报》2003,23(6):74-80

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同震阶变异常的特征与机制分析     

李兰生  刘建华 《大地测量与地球动力学》1992,(3)

本文对徐州地震台JB—72水平摆倾斜仪1988年11月至1989年5月间所记录到的24次同震阶变进行了深入分析,认为:a.造成同震阶变的原因是多方面的,而反应了地球应变场准静态调整的同震阶变才是有价值的价变异常;b.多观测手段的地震台站,同震阶变应该在不止一台仪器上得到响应。  相似文献   

八家子铅锌矿区吴家屯矿床矿物特征及银赋存状态     

王树华 《国土资源》1992,(2)

八家子铅锌矿区吴家屯矿床是燕山期形成的热液充填交代脉状铅锌矿床。矿床中除铅锌矿外还伴生有银、硫、铜、锰等多种有益元素。银主要呈微粒自然银、辉银矿、金银矿、银黝铜矿、黝锑银矿、硫砷铜银矿、含碲银矿物等产出,并呈包裹体产于方铅矿、闪锌矿、黄铁矿、黄铜矿、石英等矿物中,或充填于这些矿物的裂隙及晶隙中。少部分银则以类质同象形式存在于方铅矿、黄铁矿矿物中。  相似文献   

地理信息系统数据库设计     

潘珩 《成都信息工程学院学报》2006,21(4):555-558

首先分析了地理信息系统的组成、地理信息系统数据的特征、地理信息系统数据库的功能，然后进行了中心式导航系统数据库的设计，给出了数据库模型的E-R图，最后描述了空间地理信息的查询功能。  相似文献   

The Dependence of Water Exchanges between the Kuroshio Water and Its Surroundings on the Characteristics of the Kuroshio‘s Meanders     

姜华  吴德星  万修全 《中国海洋湖沼学报》2003,21(4):335-344

Observation of fluid parcel pathways in the Kuroshio Stream revealed a striking crossstream pattern associated with the Kuroshio‘‘ s meanders. In order to understand the observed pattern, a two-dimensional kinematic model of a meandering jet was developed which could be used to examine the relationship between streamfunction patterns and fluid parcel trajectories. The experiments designed to investigate the dependence of the water exchanges between the Kuroshio water and its surroundings on the characteristics of the Kuroshio‘‘s meanders involved the downstream speed,phase speed and the amplitude of other propagating waves. The results suggested that fluid parcels could cross the meandering jet to and fro; and that the water exchanges between the Kuroshio and its surroundings increased with a) increasing meander amplitude, b) decreasing downstream speed, and c) increasing wave phase speed. The results also showed that when the meandering jet was disturbed by other propagating waves, more effective water exchanges could be induced.  相似文献   

一种甲烷连续测量系统的开发并用于某些源区甲烷分布的研究     

TohJi.  Y 裴韬 《地质科学译丛》1995,12(1):58-61

为了调查大气甲烷的区域分布，我们用火焰离子检测器（ＦＩＤ）制成了一台连续测量系统。由于ＦＩＤ几乎对所有的烃类都敏感，故而让样气通过一个装有Ｐｔ催化剂的加热柱体以除去非甲烷烃，得到低达０．００４×１０＾－６Ｖ的检出限和短达１０ｓ的响应时间。我们把该系统装配在汽车上，测量了两个典型源区－稻田和天然气田上大气甲烷的区域分布。在气田的实例中，我们依据所观测的甲烷柱剖面估算了甲烷的逸散率。  相似文献   

前苏联铀矿床的主要：工业—成因类型及分布规律     

Л.  НП 李慈俊 《华东铀矿地质》1992,(4):18-29

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