二道沟金矿床中黄铁矿晶体形态及热电性与金矿化的关系     

赵秀英 《国土资源》1990,(4)

已有文献认为:空穴型黄铁矿的存在对金成矿有利。作者对二道沟金矿床的研究表明,金矿化程度不仅与黄铁矿的热电性有关,而且与黄铁矿的晶体形态关系十分密切。富矿体中黄铁矿晶体形态复杂,种类多并以五角十二面体为主,叶夫济科娃晶体形态得分值(XFeS_)高;含矿较贫或不含矿的岩体黄铁矿晶体形态简单,种类少并以立方体为主,叶夫济科娃晶体形态得分值(XFeS_2)低。  相似文献   

AutoCAD环境下大比例尺地形图符号库的制作     

李洪玉  李永香  国仲凯  赵秀英 《四川测绘》2009,32(2):74-77

本文论述了在AutoCAD环境下，大比例尺地形图符号库（点状符号、线状符号、面状符号）的定制和开发方法，并用程序予以实现，在实际工作中具有一定的应用价值。  相似文献   

浅论WebGIS技术   总被引：3，自引：0，他引：3  

赵秀英 《测绘与空间地理信息》2004,27(2):24-25

论述GIS的发展及其优缺点,讨论WebGIS的特点以及技术实现方式。  相似文献   

太阳磁场演化和湍动大气中的耀斑能量积累     

Yin  CL Wu  ST 《紫金山天文台台刊》1994,13(2):141-151

In this paper we present the results of both evolution of Bibolar Magnetic Regions and flare energy buildup with supergranular diffusion. Based on these results we find (i) MHD processes including diffusion and cyclonic of turbulence play a significant role for the development of the complexities of an active region. The meridional flow controls the poleward migration of magnetic field of the active regions, (ii) The diffusion of photosphere field and the magnitude of the shear speed have important effects on the total energy storage in the solar corona.  相似文献   

SAMHO BROTHER benzene ship accident     

Lin CL  Hu JH 《Marine pollution bulletin》2007,54(8):1285-1286

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Taxonomic sufficiency for soft-bottom sublittoral mollusks assemblages in a tropical estuary, Guanabara Bay, Southeast Brazil     

Mendes CL  Tavares M  Soares-Gomes A 《Marine pollution bulletin》2007,54(4):377-384

Guanabara Bay (GB) is considered to be one of the most polluted environments of the southern Brazilian coastline. This typical estuarine system is impacted by the heavy discharge of both industrial and domestic waste from the Rio de Janeiro metropolitan area. The mollusc community structure and distribution was investigated between 2000 and 2001, using a three month sampling design of 38 stations, according to austral seasons. Species abundance was aggregated into progressively higher taxa matrices (genus, family, order) and were analysed using multivariate techniques. Mollusc distribution in GB varied significantly in space and time and was probably ruled by the organic enrichment effects of hypoxia and altered redox conditions coupled with prevailing patterns of circulation. Within the sectors of GB an increasing gradient in mollusc diversity and occurrence was observed, ranging from the azoic and impoverished stations in the inner sector to a well-structured community in terms of species composition and abundance inhabiting the outer sector. The non-metric multidimensional scaling (nMDS) and cluster analysis showed similar results when species were aggregated into genera and families, while greater difference occurred at coarser taxonomic identification (order). The literature about taxonomic sufficiency has demonstrated that faunal patterns at different taxonomic levels tend to become similar with increased pollution. In Guanabara Bay, an analysis carried out solely at family level is perfectly adequate to describe the ecophysiological stress. Further aggregation to order level changed the perceived patterns of differences. However, a different taxonomic resolution can be chosen depending on the type of ecological patterns investigated.  相似文献   

Mechanisms for the prevention of marine bioinvasions for better biosecurity     

Hewitt CL  Campbell ML 《Marine pollution bulletin》2007,55(7-9):395-401

Biosecurity management allows countries to meet a number of international obligations and provides some protection from potential degradation of environmental, economic, social and cultural values. Ocean governance relies on the precepts of ecologically sustainable development to manage the multiple uses in the coastal zone. The increasing reliance on aquaculture to provide food security and economic development has led to an increase in the use of non-native target species grown as food sources. Increased economic activity has led to shifting trade patterns and increased efficiencies in vessels with the resulting increase in the number of introduced marine species via ballast water and hull fouling. Herein we review the different marine biosecurity strategies and legislation that have been implemented internationally and locally that aid in preventing and managing introduced marine species, with some attention to Australia and New Zealand as examples. Typical tools being used include quarantine, Import Health Standards, voluntary cleaning guidelines, and risk assessment, all of which aim to prevent introductions.  相似文献   

Polybrominated diphenyl ethers and polychlorinated biphenyls in sediments of southwest Taiwan: regional characteristics and potential sources   总被引：1，自引：0，他引：1  

Jiang JJ  Lee CL  Fang MD  Ko FC  Baker JE 《Marine pollution bulletin》2011,62(4):815-823

Very little information is available on the contamination of coastal sediments of Taiwan by PBDEs and PCBs. In this study, we determined the concentrations of 19 PBDE and 209 PCB congeners in 57 surface sediment samples to identify the possible sources of PBDEs and PCBs. The total PBDE and PCB concentrations ranged from below detection limit to 7.73 ng/g and 0.88-7.13 ng/g, respectively; these values are within the ranges observed for most coastal sediments worldwide. The PBDE congeners were dominated by BDE-209 (50.7-99.7%), with minor contributions from penta- and octa-BDEs. The signatures of PCB congeners suggested that PCB residues in Kaohsiung coast may be the legacy of past use or the result of ongoing inputs from the maintenance, repair and salvage of old ships. Principal component analysis of the congener-specific composition of PBDEs and PCBs revealed distinct regional patterns that are related to the use of commercial products.  相似文献   

自动气象站数据异常的原因分析     

许嘉玲王超球  赵秀英 《广西气象》2007,28(A02):190-190

（1）采集器损坏导致无法采集数据，出现数据全部缺测。（2）采集器电源系统故障，致使定时数据无法采集，出现要素全部缺测。（3）通信线路出现故障。当自动气象站的防雷板、终端机的串口或连接卡、串口隔离器被雷击、通信线缆出现断开或其他因素导致开路都是导致自动气象站数据全部缺测的原因。（4）自动气象站计算机终端的硬盘或主板问题，导致采集发送过来的数据无法存贮，  相似文献   

风暴强度指数SSI   总被引：9，自引：2，他引：7  

赵秀英  吴宝俊 《气象》2000,26(5):55-56

近年刊出的强对流天气分析预报文献(例如文献 [1 ]、[2 ])中 ,常常用到风暴强度指数 ( storms severity index,缩写为 SSI )。现根据检索到的部分文献中之解释 ,对其介绍如下。在 2 0世纪 70年代初 ,Miller认为 [3] :在强热力学不稳定和强动力学因子都出现时 ,才有强雷暴发展 (称“经典的 Miller个例”)。然而 ,后续的研究发现 ,这些典型条件不能包含发生的全部强天气。 Maddox等 [4] 、Vigneux等 [5]以及 Turcotte等 [6]指出 :在强热力学条件和弱的动力学条件下以及弱热力学条件和强动力学条件下也可出现强天气。与文献 [4、5、6 ]的思…  相似文献