佳木斯隆起带乌拉嘎断裂西缘 1:5万水系沉积物测量方法研究     

白显清  单久库  那晓红  贾宏 《物探与化探》2007,31(5):469-472

前人研究成果表明,有机质吸附作用使样品中的元素产生一定的富集,这种影响随着有机质含量增加而越加强烈,将掩盖元素真实含量的起伏,造成假异常.通过对佳木斯隆起带乌拉嘎断裂西缘水系沉积物样品的分配及有机质含量特征、主要成矿元素的表生地球化学分布特征的研究,认为野外截取-10～+60目粒级段作为采样介质,可完全满足工作需要,获得真实可靠的地球化学异常,取得较好的地质找矿效果.  相似文献   

基于GIS的1:5万区调野外空间数据快速采集技术   总被引：9，自引：0，他引：9  

袁艳斌  韩志军  刘刚  汪新庆 《地球科学进展》2000,15(3):348-352

利用ＧＩＳ技术综合多源地学空间信息,应用于区域地质调查的重要方面－野外空间数据采集。根据我国１：５万区调工作流程和数据采集的特点,在野外空间数据采集子系统中应用系统工程的思想,采用ＭａｐＧｉｓ和ＡｒｃＶｉｅｗ工具型地理信息系统软件,进行二次开发;从野外空间数据采集的标准化、数据字典、地质观察点定位、空间数据及其相关的属性数据的一体化采休、素描图的绘制等面加以研制,初步实现了１：５万区调系统中的野外  相似文献   

离石丰义剖面2.50 MaB.P.前后地质事件研究   总被引：1，自引：0，他引：1  

罗运利  夏正楷  曹家欣 《海洋地质与第四纪地质》2000,20(2):83-86

对离石丰义剖面红土与黄土之间发育的厚约２ｍ的岩性混杂层从磁性地层、稳定同位素、天体撞击事件等方面进行了分析与探讨,初步认为Ｍ／Ｇａ界限位于岩性混杂层中部,从Ｎ２红土到岩性混杂层,气候由干热暖湿转变;由岩性混杂层到第四纪黄土,气候由暖湿向干冷转化 ;在岩性混杂层中发现有蛎量的强磁性微颗粒,可能为微玻璃陨石或铁质陨石,这可能意味着一次天体撞击事件的发生。  相似文献   

高光谱-LiDAR多级融合城区地表覆盖分类   总被引：3，自引：3，他引：0  

曹琼  马爱龙  钟燕飞  赵济  赵贝  张良培 《遥感学报》2019,23(5):892-903

城市地区地表覆盖分类在城市研究中是一个十分重要的方向。遥感作为获取地物物理属性的一种重要技术手段,已初步应用于分类研究中。然而,随着城镇化的不断推进,城市内部地物类型越来越复杂,单一的遥感影像已无法满足城区地表覆盖分类中高精度的要求。高光谱影像和LiDAR数据能够分别表征地物的光谱信息及高程而被广泛应用。因此,根据两者之间互补的优势,本文提出了基于高光谱影像和LiDAR数据多级融合的城区地表覆盖分类方法。首先对两幅影像分别进行特征提取,将提取到的光谱、空间及高程信息进行层叠实现特征级融合。对得到的特征影像的所有像素点进行分类,然后利用LiDAR点云数据提取的建筑物掩膜,对非建筑物部分进行分类,再次实现特征级融合,以此改善建筑物区域与非建筑物区域的混淆。然后将未使用掩膜得到的分类结果与利用掩膜得到的分类结果进行投票实现决策级融合。最后利用条件随机场模型对分类结果进行后处理操作,达到平滑图像去除噪声点的目的。  相似文献   

基于MAPGIS的1:5万地质图管理系统设计与实现   总被引：1，自引：0，他引：1       下载免费PDF全文

赵林林  刘荣梅 《中国地质调查》2015,2(1):55-60

针对目前获取的海量区域地质图数据管理难的问题,提出了建立1∶5万区域地质图数字化建库内容的管理方法。在研究MAPGIS技术和相关计算机技术的基础上,设计了一种GIS应用系统的解决方案。该系统具有数据入库管理、属性代码转换、数据分布式存储管理、空间查询、地理要素检索、地理内容检索等功能。实验结果表明,地质图管理系统为区域地质图数据规范化管理提供了基础平台,对保证区域地质数据库建设成果数据积累和社会服务应用具有重要意义。  相似文献   

自动气象站DT50数据采集器故障检修方法     

杨崇静  安学银  郭海涛  马传成 《气象科技》2014,42(3):413-416

针对近年来山东省CAWS600-B型自动气象站出现的DT50数据采集器故障及其修复情况,分类介绍了DT50四种常见故障的实验室检修方法。在实验室进行DT50检修时,首先采用专用通信线直接连接DT50和主控机的简化连接方式实现DT50的数据通信;要素数据异常故障可考虑更换通道选择芯片CD4052进行排除;通信故障一般可通过更换通信驱动模块SP312进行排除;采集器内置程序跑飞时,需要重新写入DT50内置程序;DT50内部时间显示错误时考虑更换下电路板电池;对DT50故障检修过程中的注意事项进行了说明。通过以上四种故障检修方法,能够成功修复除数据小幅超差以外的绝大多数DT50故障。  相似文献   

国家新版1：50000地形图制图技术设计与实践     

王东华  商瑶玲  刘建军  王桂芝  吴晨琛  李曌 《测绘软科学研究》2014,(1):16-21

国家新版1：50 000地形图制图工程是国家1：50 000数据库更新工程主要任务的有效延伸和重要补充,它基于最新的1：50 000地形数据库,采用数据库驱动制图技术,实现了地形图制图数据的快速生产与建库。本文在对现状和需求分析的基础上,重点介绍开展制图工程的技术方法、工艺流程、成果特点等内容。  相似文献   

Nutrients in an oligotrophic boundary current: Evidence of a new role for the Leeuwin Current   总被引：1，自引：0，他引：1  

P.A. Thompson  K. Wild-Allen  M. Lourey  C. Rousseaux  A.M. Waite  M. Feng  L.E. Beckley 《Progress in Oceanography》2011,91(4):345-359

New observations along the continental shelf of Western Australia provide a novel explanation for the established ∼60 years relationship between Leeuwin Current (LC) strength and greater winter nitrate concentrations at 32°S plus the inter-annual variation in the magnitude of the annual, shelf-scale, phytoplankton bloom. The potential source of dissolved nitrogen to support the annual shelf scale phytoplankton bloom was identified as thin layers of an unprecedented areal extent, nitrate concentration and shallow nature that were observed off the northwest of Australia. We propose that the dissolved inorganic nitrogen (DIN) in these layers enters the LC at depth and then enters the euphotic zone via by three mechanisms: instability that results in a warm core eddy, cooling that deepens the surface mixed layer and shallowing of the thin layer. During the onset of the annual phytoplankton bloom along the west coast of Australia from 22°S to 34°S the poleward flowing LC was clearly evident as a surface intensified ocean boundary current transporting warmer, lower-salinity, greater-silicate waters in a shallow mixed layer rapidly southward. Between 24 and 26°S the core of the LC was present as a 50–100 m deep layer over one or more thin layers, 15–50 m thick, with high nitrate and low dissolved oxygen (DO). These layers were of lower salinity, cooler water with markedly reduced DO, high nitrate concentrations and distinct nitrate:silicate (NO₃:Si(OH)₄) nutrient ratios. As the LC flowed south it cooled and deepened thereby entraining the thin layers of high nitrate water into the euphotic zone. The LC also formed large (greater than 100 km diameter) warm core eddies with a deep surface mixed layer that also entrained nitrate from these thin layers. In some locations as far south as 32°S the LC was still present with the thin layer of high nitrate intact but now within the euphotic zone. Thus, the available evidence suggests the LC arises under conditions that favour rapid and shallow nitrification. This nitrification fuels a shelf-scale bloom on a downwelling favourable coast. Depending upon the rate of nitrification the source of the particular organic matter may be local or delivered from the tropics via horizontal advection in a subsurface layer of the LC.  相似文献   

A VIBRIO ANGUILLARUM STRAIN ASSOCIATED WITH SKIN ULCER ON CULTURED FLOUNDER, PARALICHTHYS OLIVACEUS     

莫照兰  谭训刚  徐永立  张培军 《中国海洋湖沼学报》2001,(4)

ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｃｒｅａｓｉｎｇａｔｔｅｎｔｉｏｎｗａｓｆｏｃｕｓｅｄｏｎｔｈｅｎｅｅｄｔｏｓｔｕｄｙｔｈｅｂａｃｔｅｒｉｏｌｏｇｙｏｆｍａｒｉｎｅｆｉｓｈｉｎＣｈｉｎａ ,ｂｅｃａｕｓｅｏｆｂａｃｔｅｒｉａａｓｓｏｃｉａｔｉｏｎｗｉｔｈｈｉｇｈｍｏｒｔａｌｉｔｙｉｎｍａｒｉｎｅｆｉｓｈｃｕｌｔｕｒｅａｎｄｃｏｎｓｅｑｕｅｎｔｅｃｏｎｏｍｉｃｌｏｓｓｔｏｆｉｓｈｆａｒｍｓ (Ｄｅｎｇｅｔａｌ.,1 996;Ｌｉｎｅｔａｌ.,1 999) .Ｖｉｂｒｉｏｇｅｎｕｓｂａｃｔｅｒｉａｈａｖｅｅｍｅｒｇｅｄａｓｔ…  相似文献   

A VIBRIO ANGUILIARUM STRAIN ASSOCIATED WITH SKIN ULCER ON CULTURED FLOUNDER, PARALICHTHYS OLIVACEUS   总被引：2，自引：2，他引：0  

Mo Zhao-lan  Tan Xun-gang  Xu Yong-li  Zhang Pei-jun 《中国海洋湖沼学报》2001,19(4):319-326

The characteristics of a bacterium strain M3, isolated from cultured flounderParalichthys olivaceus with remarkable external sign of skin ulcer during an epizootic outbreak, indicated that the bacterium belonged to the speciesVibrio anguillarum. Challenge by I.M. (intramuscular injection), bath, and oral administration with M3 showed that it was highly pathogenic forParalichthys olivacues. The LD₅₀ dose was 5.144×10³ CFU/ per fish infection by I.M. injection. Recovered inoculated bacteria from the surviving fish revealed that the asymptomatic carriers could be a latent contagious source. Study of the effect of bacterial culture CFS (cell-free-supernatant) showed that the exotoxins produced by M3 play an important role in its pathogenicity for flounder. The resistance of M3 to 36 out of 41 antibiotics indicated that the bacterial disease outbreak was mainly attributable to the frequent and excessive use of antimicrobial agents; and that vaccination would be an effective precaution against bacterial disease. Contribution No. 4107 from Institute of Oceanology, Chinese Academy of Science. Contribution No. 270 from Experimental marine Biology Laboratory, CAS. Funded by projects under the Major State Basic Research Development Program, Grant G1999012003.  相似文献