科威特沙漠风成沉积物与气侯,土壤和植被的关系     

AL－N.  GA  周纪侠 《世界沙漠研究》1989,(2):8-13

  相似文献   

安大略西北部哲里矿铜—镍硫化物的变质作用和浅成蚀变     

George C.Patterson  David N.Wstkinson  胡维兴 《华北地质》1985,(2)

引言本文目的在于用资料证明并解释哲里(Thierry)矿的各种硫化物组合。这些说明连同容矿岩的岩石学研究,证明了与镁铁质到超镁铁质岩石伴生的铜—镍矿床,在它们由岩浆作用形成之后,并不是静止的。更确切一点说,动力区域变质作用和浅成蚀变,对于同这些岩石伴生的矿体的演化,扮演了一个重要的角色。  相似文献   

茅排金矿床中自然金和黄铁矿的成因矿物学特征     

徐海江  张凤云  赖绍聪 《岩石矿物学杂志》1993,12(4):363-370

作者通过对新发现的茅排金矿的研究,测试了自然金、黄铁矿的物理性质、化学成分等,并论述了成因矿物学特征。文中指出自然金、黄铁矿在矿体垂向上晶体形态的分布规律,利用形态系数计算公式可判断矿体、矿带的延伸方向和剥蚀程度。并指出,明金常见,自然金成色高,矿石中贫硫化物,黄铁矿中金品位高、Sb、Hg极低、无As,Co/Ni比较稳定、晶胞参数和红外吸收峰偏大等是“茅排式”金矿床的特点。  相似文献   

ON THE PREDICTION OF TRANSIENT BED LEVELS DUE TO AGGRADATION AND DEGRADATION INCLUDING ARMOURING     

A.B.PALANIAPPAN  R.J.GARDE  P.N.GODBOLE 《国际泥沙研究》1998,(1)

ＯＮＴＨＥＰＲＥＤＩＣＴＩＯＮＯＦＴＲＡＮＳＩＥＮＴＢＥＤＬＥＶＥＬＳＤＵＥＴＯＡＧＧＲＡＤＡＴＩＯＮＡＮＤＤＥＧＲＡＤＡＴＩＯＮＩＮＣＬＵＤＩＮＧＡＲＭＯＵＲＩＮＧＡ．Ｂ．ＰＡＬＡＮＩＡＰＰＡＮ１,Ｒ．Ｊ．ＧＡＲＤＥ２ａｎｄＰ．Ｎ．ＧＯＤＢＯＬＥ３...  相似文献   

APPLICATION OF THE TRRL FLOOD ESTIMATION MODEL IN HYDROLOGICAL FORECASTING FOR CATCHMENTS WITH LIMITED DATA A CASE STUDY     

OTIENO  F.A.O  KIBATA  N. 《国际泥沙研究》1998,(4)

１ＩＮＴＲＯＤＵＣＴＩＯＮＯｎｔｈｅｍｏｒｎｉｎｇｏｆ３０ｔｈＪａｎｕａｒｙ１９９２,ａＮａｉｒｏｂｉｂｏｕｎｄｐａｓｅｎｇｅｒｔｒａｉｎｆｒｏｍＭｏｍｂａｓａｏｎｔｈｅｍａｉｎｌｉｎｅｄｅｒａｉｌｅｄｉｎｔｏａｎｅｍｂａｎｋｍｅｎｔｔｈａｔｈａｄｂ...  相似文献   

地球化学异常分离的空间分析法     

Cheng  Q 江云华 《物探化探译丛》1998,(5):46-56

  相似文献   

灰色系统理论在预测西安市地面变形中的应用     

刘涌江  杨梅忠 《西北地质》1998,19(2):54-58

西安市地裂缝的活动,导致了西安市工程地质环境的日趋恶化,造成了不可估量的经济损失。本文以灰色系统理论为基础,建立了小寨地裂缝东段引起地面变形的GM（1,1）模型,并用本模型对该区域今后数年内的变量进行了预测．它克服了传统方法需要确定影响因素及其权重的困难,使用比较方便．  相似文献   

三维地震模型实验系统的研究     

薛建  田钢  王者江  曾昭发 《吉林大学学报(地球科学版)》1998,(3)

三维地震模型实验系统主要包括三维坐标自动控制、高速数据采集、超声脉冲或可变频正弦信号发射等装置。着重研究了三维坐标自动控制和高速数据采集。使用变频与等效采样技术,解决了坐标系统的运行精度及超高速数据采集的问题,其中等效采样技术也适合于雷达、声纳信号的采集。  相似文献   

试论Colaniella的指相意义   总被引：2，自引：0，他引：2  

江纳言  王克良 《地层学杂志》1985,(1)

<正> Colaniella是古生代末期繁衍在特提斯海区的一个有孔虫属。最初M.Colani(1924)名其为Pyramis属,1934年B.K.Licharev改为此名,一直沿用至今。B.K.Licharev(1935)、M.Reichel(1945)及王国莲(1966)等的生态研究,已有了较完整的了解。而且还被一些学者作为晚二叠世的一种分带化石(M.I.Sosnina,1960;K.Ishii 1975)。Cola-  相似文献   

Cost/benefit analysis of a benthic monitoring programme of organic benthic enrichment using different sampling and analysis methods     

Lampadariou N  Karakassis I  Pearson TH 《Marine pollution bulletin》2005,50(12):1606-1618

To investigate the combined effects of decreasing taxonomic resolution (i.e. species, family, phylum), the use of different mesh-size (1.0 mm and 0.5 mm) and the type of samplers used (van Veen vs. corers taken by divers) on the quality of data obtained, a comparative study was undertaken with the overall aim of identifying cost efficient methods for routinely monitoring the ecological change caused by Mediterranean fish farming. The results clearly showed that information loss was relatively low as data were aggregated at higher taxonomic levels, particularly up to the level of family or even order. It was also found that the extra information gained by sieving samples through a 0.5 mm sieve did not improve the ability to distinguish the potentially impacted sites from the control stations. Finally, it was found that a relatively large proportion of the available information concerning the community structure such as abundance, biomass or diversity is lost when sampling is carried out with corers. A cost/benefit ratio analysis for the two sampling and the two sieving methods showed minimal values for the van Veen samples (for both sieve fractions) at the family level, indicating that analysis at this level gives the best balance between precision of the results and decrease in taxonomic effort. However, if the time needed to sort the samples is included in the analysis, then samples taken with corers using a 0.5 mm sieve and identified to families seems like a good compromise between precision and cost.  相似文献