柯树背岩体的副矿物特征及地质意义   总被引：1，自引：1，他引：1       下载免费PDF全文

胡恭任  刘丛强  陈培荣  于瑞莲 《地球学报》2003,24(3):231-236

本文详细研究了柯树背岩体的岩石学及副矿物学特征，研究发现F9大断裂以西部分(西体)与F9大断裂以东部分(东体)在岩性、矿物组成、副矿物特征、锆石群型特征上存在很大差别，副矿物特征、锆石群型特征指示东体与寨背岩体类似，为同熔系列花岗岩；西体为重熔再生岩浆成因的改造型花岗岩。这一认识对于该区的铀金找矿具有一定的指导意义。  相似文献   

卫星测高问题的球谐级数解法   总被引：3，自引：0，他引：3  

于锦海 《测绘学院学报》2003,20(1):7-9

研究了球界面下卫星测高问题的解法，利用有限逼近方法得到了下列结论：若陆地部分是球冠，则卫星测高问题的解可以转换成关于球谐级数位系统的线性方程组。同时证明了常用的Stokes问题、Dirichlet问题、Neumann问题可以看成卫星测高问题的特殊情况。  相似文献   

Surface chemical analysis in coal preparation research: complementary information from XPS and ToF-SIMS     

A. N. Buckley  R. N. Lamb 《International Journal of Coal Geology》1996,32(1-4)

The application of X-ray photoelectron spectroscopy (XPS) to coal surface characterisation for preparation research is described. Progress towards the acquisition of complementary surface chemical information by time-of-flight secondary ion mass spectrometry (ToF-SIMS) is also discussed. Surface-based beneficiation techniques such as flotation are assuming greater importance as the proportion of fines in raw coal increases due to the proliferation of high capacity mining methods. A necessary condition for the floatability of a coal particle is adequate hydrophobicity, and the degree of hydrophobicity of the flotation concentrate is one factor influencing the ease with which its dewatering can be affected. The hydrophobicity of a coal is very difficult to measure directly because of microporosity, and it is often necessary to deduce the degree of hydrophobicity from a knowledge of the surface chemistry. XPS is able to provide sufficient analytical data to allow relative levels of hydrophobicity to be estimated. In principle, ToF-SIMS should be able to supply additional information enabling refinement of such estimates; however, there are insufficient data at present to allow the ionic fragments detected to be related to specific functional groups at the coal surface.  相似文献   

Doing groups: Situating knowledge and creating stories     

Andrew McGregor 《The Australian geographer》2004,35(2):141-149

This paper presents group research as a potentially powerful research tool for cultural geographers interested in the ways knowledge is produced at the interpersonal level. I argue that groups can create unique research spaces that incorporate 'sociality', the everyday social norms, logics and languages that guide ordinary conversations, into the research agenda. By concentrating on these discursive norms, insights can be obtained into the ways that knowledge is negotiated, produced and constrained in different places. To demonstrate the value of group research, a case study involving Australian environmentalists is analysed, to show how forests are constructed, contested and naturalised within this particular subculture. The article concludes by emphasising the importance of group research to critical geographers interested in social empowerment and change.  相似文献   

Economic valuation of policies for managing acidity in remote mountain lakes: Examining validity through scope sensitivity testing     

No author 《Aquatic Sciences - Research Across Boundaries》2005,67(3):392-291

No Abstract. .The following two amendments concern the above mentioned article that appeared electronically Online First on June13, 2005 (this issue, pp. 274–291).1. the first name of the author Cooper is Philip (and not Phillip).2. the correct grant reference number is EVK1-CT-1999-00032 (instead of: EVK1-CT-2002-00121).  相似文献   

The inadequacy of the fish-bearing criterion for stream management     

Kenneth W. Cummins  Margaret A. Wilzbach 《Aquatic Sciences - Research Across Boundaries》2005,67(4):486-491

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青海省新型功能材料研究和产业的分析(续完)   总被引：1，自引：0，他引：1       下载免费PDF全文

贾永忠  韩金铎  景燕  金山  祁太元  封凌平  景满德 《盐湖研究》2005,13(1):69-72

介绍了部分新型功能材料的前沿领域发展情况;通过对青海省在能源、矿产资源方面的优势及青海省可持续发展能力的分析,对我省目前及未来可以发展的新型功能材料产业提出了意见和建议。  相似文献   

中国城市职能分类研究综述   总被引：5，自引：1，他引：5  

徐红宇  陈忠暖  李志勇 《云南地理环境研究》2005,17(2):33-36

城市职能分类的研究一直以来就是城市地理学研究的重要领域。在简要回顾中国城市职能分类研究的主要成果和观点的基础上，从研究的阶段性角度将城市职能分类分为研究初步展开、研究发展、研究逐步完善3个时期；并提出为适应新形势的发展，城市职能分类研究将在拓展研究对象、创新研究方法、完善数据指标体系、充分利用研究成果等方面得到完善和提高。  相似文献   

Analysis of wave groups by wave envelope-phase and the Hilbert Huang transform methods     

《Applied Ocean Research》2016

The wave groups are studied by both conventional wave analysis methods and by the non-stationary Hilbert Huang Transform (HHT) method. Full-scale wave records containing abnormal waves are used. Instantaneous quantities, such as envelope, phase and frequency, are adopted to study the wave grouping. A refined definition of wave group is proposed considering that the wave process is simultaneously amplitude and frequency modulated. The validation of the proposed definition is conducted by analysis of numerical simulation data. Group parameters are proposed based on the time-frequency distribution of energy. An attempt is made to find the relationship between the characteristics of abnormal waves and the group characteristics.  相似文献   

不同饵料种类、投喂方式及环境条件对凡纳滨对虾相对摄食量的影响     

肖善势  何琳  徐永健  何京  林志华 《海洋科学》2016,40(5):36-42

为提高对虾养殖过程中的饵料利用率并减少养殖废水的排放,作者以凡纳滨对虾(Litopenaeus vannamei)为实验对象,研究了不同饵料种类、投喂方式、体质量、充气量、光照强度、水温及盐度对其相对摄食量的影响。结果表明:配合饲料组对虾的相对摄食量显著高于冰鲜虾肉组;连续单颗投喂时对虾的相对摄食量较高;相对摄食量随对对虾体重升高而显著(P0.01)下降,而且不同规格的对虾在竞争条件下平均相对摄食量会降低;充气量6 L/min组对虾的相对摄食量明显高于另外两组;弱光环境下对虾的相对摄食量较高;水温和盐度对相对摄食量的影响极显著(P0.01),在32℃时对虾获得最大相对摄食量,在盐度为5时相对摄食量最小,高盐度下组间差异不显著(P0.05)。因此,在实际生产中应采取少量多次的投饵策略,并根据环境条件的变化合理的调整投饵量。  相似文献