苏门答腊—安达曼地震的GPS分析     

S．A．Khan O．Gudmundsson左玉玲  郑需要 《世界地震译丛》2005,(1):9-12

2004年12月26日印度尼西亚苏门答腊地震是历史上破坏性最强的地震之一。此次地震的震级Mw=9．3(根据Stein和Okal以简正模式振幅修订，http：//www．earth．northwestern．edu／people／seth／research／sumatra．html)，是自1900年以来记录到的第二最大地震。它发生在苏门答腊岛北部以西100千米的近海处，  相似文献   

WATER QUALITY STUDIES IN MALAYSIAN DISUSED MAN MADE LAKFS FOR SUITABILITY OF AN AQUACULTURE PROJECT     

Azma Hanim Ismail Mashhor Mansor Wan Maznah W O 《湿地科学》2005,3(4):258-268

A study has been conducted on the status of water quality in two disused man made lakes, which have potential for cage aquaculture project. This study highlights the quality of water analyzed with reference to various physical - chemical parameters in two selected lakes and their suitability for fish farming. A number of parameters were measured including the amount of NH3 - N, NO3 - N, NO2 - N and total phosphorus while in - situ measurement including DO, pH, temperature, conductivity, TDS and Secchi disk visibility. Beside the physical -chemical of water, the location, morphometry and climate conditions were also investigated. The chemical data analyzed for six months indicated that Lake A and Lake B are characterized by relatively high DO, slightly neutral pH and low TSS. The concentration of NH3 -N and NO2 -N was very low （0. 058 mg/L and 0. 04 mg/L, respectively） and total phosphorus was usually in low concentration and sometimes would seem negligible. Besides, NO3 - N occurred in slightly higher concentration （1.75 mg/L）. Results obtained indicated that the study site has high potentiality for development of inland fisheries practices.  相似文献   

The Timing of the Palaeoproterozoic Great Oxidation Event using Dykes,Sills and Bolcanics of the Ongeluk Large Igneous Province,Kaapvaal Craton     

Ashley P. GUMSLEY  Kevin R. CHAMBERLAIN  Wouter BLEEKER  Ulf S?DERLUND  Michiel O. DE KOCK  Tobias C. KAMPMANN  Emilie R. LARSSON  Andrey BEKKER 《《地质学报》英文版》2016,90(Z1):67-68

正The Neoarchaean to Palaeoproterozoic Transvaal Supergroup of the Kaapvaal Craton,southern Africa,is one of the best-preserved and most complete stratigraphic records across a critical in juncture in the Earth’s history.  相似文献   

he 2405 Ma and 2310 Ma Mafic Dyke Swarms in the Karelian Craton: Age, Chemical and Sr-Nd Isotope Composition, and Tectonic Setting     

Stepanova A.V.  Salnikova E.B.  Samsonov A.V.  Larionova Yu.O.  Egorova S.V.  Stepanov V.S. 《《地质学报》英文版》2016,90(Z1):123-123

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Effects of heavy metal (Pb) concentration on some growth parameters of plants grown in lead polluted soil under organic fertilizer amendment     

Ojo M. Oseni  Adekunle A. Adelusi  Esther O. Da  Abdulfatai B. Rufai 《寒旱区科学》2016,8(1):36-45

This study investigated morphological variation and biomass accumulation that occurred in Sida acuta and Chromolaena odorata plants grown in lead polluted soil under organic fertilizer amendment. The study was carried out in the screen house at the Biological Gardens of the Obafemi Awolowo University, Ile-Ife, Osun State. The experiment was a factorial combination of one heavy metal (Pb) at five levels of concentration (0, 200, 400, 800 and 1,000 mg/kg) in a completely randomized design, and were replicated three times for each of the two plants and two levels (0 g/kg and 9.4 g/kg) of organic fertilizer (OBD-Plus). Each pot was filled with 5 kg of air-dried and sieved soil and placed on a plastic tray for the collection of excess water. Two weeks after planting, seedlings of uniform height were transplanted from the nursery to experimental pots at the rate of one seedling per pot and grown for 10 weeks. The growth parameters of the plants were biomonitored for 7 weeks. After 10 weeks of treatment, the plants were harvested and dried to calculate the biomass accumulation. The two plant species performed better under fertilizer application than without it. For each of the plant species the growth parameters decreased as the levels of Pb concentration increased. Furthermore, the plants' biomass decreased significantly (p<0.05) as the levels of Pb concentration increased. The organic fertilizer helped to improve the plants' performance in lead-polluted soil.  相似文献   

Making and unmaking continental mantle: Geochemical and geophysical perspectives     

William L. Griffin  Suzanne Y. O’Reilly 《《地质学报》英文版》2018,92(Z1):249-250

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非均匀孔隙介质中的弥散作用——(2)层状二维空间间断系统的预报     

O.A.Plumb  S.witater  李生彩 《世界地质》1990,(1)

第一部分(Plumb和whitaker,本期)提出的闭合法对层状系统和二维空间间断系统进行了求解,其中我们所说的w和η区形成了在空间分布的孔隙介质。闭合法问题的解使我们得到确定大范围弥散张量所需要的数据和解大范围弥散方程所需要的另外一些参数。层状系统的理论结果展示的纵向弥散系数与利用室内视均质孔隙介质根据传统关系式所得到的纵向弥散系数相比要增大几个数量级。对于这种情况的研究,混合时间—空间系数看来是重要的,而且能够引起弥散系数增大的条件该系数值也增大。二维空间间断系统的结果与实验观测是一致的,而且我们发现非均匀性的规模和两个区之间的水力传导系数的差别对大范围弥散张量具有重要影响。正如层状介质情况那样,时间—空间混合导数(不对称向量)的系数的预测值表明该项可能是非均质孔隙介质的物质运移预报的一个重要的因子。  相似文献   

城市地区灾害评价和沉积学模式的应用     

M‘Kr.  GA  王伍云 《国外第四纪地质》1989,(3):14-24

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匈牙利北部早中新世盆地演化：构造与海平面变化     

Sztan.  O 程日辉 《世界地质》1994,13(3):79-85

一般认为匈牙利北部渐新世─早中新世盆地演化最初是由产生一个大的二级海侵一海退相旋回的挤压构造所推动的。早中新世盆地的演化在一个过度充填的挠曲（ｆｌｅｘｕｒａｌ）盆地中，得以用＂磨拉石＂沉积作用最好地了解。在这期间邻近的西Ｃａｒｐａｔｈｉａｎ逆冲褶皱带的逆冲作用渐渐停止，导致其抬升暴露，大量的沉积物被带入挠曲盆地，使盆地充填至海平面。在这个挠曲盆地抬起的最后阶段，一个浅海沉积环境作为均衡响应而形成，并且三级海平面变化的迹象也显示出来。下中新统一系列的露头沉积学研究证实相标志发生了变化。沿着盆地缓倾斜远端（东南）一侧，一个浅海粗碎屑沉积在明显的深水沉积的粉砂岩之上的突然开始，可能是稍前于Ｂｕｄｉｇａｌｉａｎ（在ＮＮ＿１／ＮＮ＿２超微化石带的边界）的一次三级海平面下降的结果。在由此导致的低水位时期，各种潮控相进积，是＂Ｂｕｒｄｉｇａｌｉａｎ海平面上升＂引起海泛连续形成的。高水位是由加速沉积作用或构造抬升所形成的向上变浅的进积单元表现的。由浅水深为特征的典型被加长变窄的挠曲盆地具有三维性，特别适于潮汐运动的增强。这导致受潮汐影响的砂质沉积物的发育，与那些和海侵相关的单个强潮汐作用的演化的实例相反，在这里，这些条件是  相似文献   

地壳厚度的30阶次球函数级数表示     

Cadek  O 李金文 《武测译文》1993,(2):20-25

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