成矿流体中碲逸度对自然金成色的影响   总被引：1，自引：0，他引：1  

张招崇 《黄金地质》1997,3(4):9-13

富碲化物型金矿具有自然金成色高的特点，通过热力学分析，推导出碲逸度与温度和自然金中银含量的关系式，建立了ｆＴｅ２－Ｔ－ＮＡｇ图解，并论述了该类型金矿中高自然金成色的内在原因，即成矿溶液中高的碲逸度导致了高的自然金成色，同时也分析了溶液中碲逸度对金银矿物的共生组合的影响，以及对如何计算成矿溶液中碲逸度问题进行了讨论。  相似文献   

高分辨率遥感图像厚云检测算法     

郭秋  李大成  刘贺春 《地域研究与开发》2016,(4):172-176

针对高空间分辨率多光谱图像,设计了一种基于缨帽变换、数据正则化以及多尺度光谱分析技术的多尺度循环检测算法。实验结果表明:对于Landsat-7 ETM+图像,其检测精度与基于热波段的自动化云量估计算法相近,但优于传统的直接分类方法(最大似然分类与ISODATA分类)。由于该算法无需借助热波段及其他辅助数据,因而在实现高分辨率图像厚云掩膜的高效与高精度提取方面具有很高的应用潜力。  相似文献   

The Effect of Stabilizing Piles on a Self-Supported Earth-Retaining Wall     

Jaeuk Sim  Kyoungchul Kim 《Marine Georesources & Geotechnology》2016,34(3):265-279

The behavior of a self-supported earth-retaining wall with stabilizing piles was investigated using a numerical study and field tests in urban excavations. Special attention is given to the reduction of lateral earth pressures acting on a retaining wall with stabilizing piles. Field tests at two sites were performed to verify the performance of the instrumented retaining wall with stabilizing piles. A number of 3D numerical analyses were carried out on the self-supported earth-retaining wall with stabilizing piles to assess the results stemming from wide variations of influencing parameters such as the soil condition, the pile spacing, the distance between the front pile and the rear pile, and the embedded depth. Based on the results of the parametric study, the maximum horizontal displacement and the maximum bending moment are significantly decreased when the retaining wall with stabilizing piles is used. In engineering practice, reducing the pile spacing and increasing the distance between the front pile and the rear pile can effectively improve the stability of the self-supported earth-retaining wall with stabilizing piles.  相似文献   

深海半潜浮式生产平台关键理论与技术问题     

张新曙  尤云祥  滕明清 《海洋工程》2016,34(1):117-123

深海半潜浮式生产平台FPU(floating production unit)是国际海洋油气资源开发的关键基础性装备。针对半潜浮式生产平台的技术特点,系统阐述其各方面特性(包括:总布置、系泊和立管、水动力性能、结构设计与分析等)及相关研究现状和未来发展趋势。并结合我国南海地理、水文和资源环境等特点,对未来半潜浮式生产平台的开发提出了一些建议。  相似文献   

养殖斑节对虾体长与体重的关系     

吴琴瑟  黄鸿基  叶妃轩  伍健昌 《热带海洋学报》1992,(3)

通过回归分析,得出养殖斑节对虾Penaeus monodon Fabricius体长(L)与体重(W)的关系为W=aL~b。根据此公式,计算得出体长和体重换算表,这在养殖生产中有现实意义。  相似文献   

Spatial, seasonal and ontogenetic variation in diet of Northeast Arctic Greenland halibut (Reinhardtius hippoglossoides)   总被引：2，自引：0，他引：2  

Hovde  S. C.; Albert  O. T.; Nilssen  E. M. 《ICES Journal of Marine Science》2002,59(2):421-437

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直立椭圆柱体重力场的谱分析及其应用   总被引：1，自引：0，他引：1  

范守志 《海洋与湖沼》1995,26(3):234-240

利用傅里叶积分变换法导出了埋藏的直立椭圆柱体的重力场在频率域中的解析公式，依此得了确定此直立椭圆柱体尺寸的公式，提出依据这些重力公式来计算侵入大洋地壳中的地幔柱的尺寸和洋壳厚度的方法。  相似文献   

Analysis of influencing factors on fine sediment flocculation in the Changjiang Estuary   总被引：1，自引：0，他引：1  

Jiang Guojun  Yao Yanming  Tang Ziwen 《海洋学报(英文版)》2002,21(3):385-394

Based on the test data in dynamic water and static water, the main factors, which influence the fine sediment flocculation, are analyzed with a gray model method of correlation theory. It is shown that the main influencing factors are water temperature, settling time, salinity, grain size, sediment concentration and current velocity according to the correlation coefficients. Among them, the salinity and the sediment grain size are critical type influencing factors (CrTIF); the settling time, the sediment concentration and the velocity are continuous type influencing factors (CoTIF); and the water temperature has the characteristics of both. When the critical values of CrTIF are reached or exceeded, the fine sediments will be flocculated, but values of CrTIF will not influence the settlement strength of floes. The influence of CoTIF is continuous. The values of the CoTIF will not only influence the occurrence of flocculation but also the settlement strength of the floes.  相似文献   

Probabilistic analyses of soil consolidation by prefabricated vertical drains for single‐drain and multi‐drain systems          下载免费PDF全文

Mohammad Wasiul Bari  Mohamed A. Shahin  Abdul‐Hamid Soubra 《国际地质力学数值与分析法杂志》2016,40(17):2398-2420

Natural soils are one of the most inherently variables in the ground. Although the significance of inherent soil variability in relation to reliable predictions of consolidation rates of soil deposits has long been realized, there have been few studies that addressed the issue of soil variability for the problem of ground improvement by prefabricated vertical drains. Despite showing valuable insights into the impact of soil spatial variability on soil consolidation by prefabricated vertical drains, available stochastic works on this subject are based on a single‐drain (or unit cell) analyses. However, how the idealized unit cell solution can be a supplement to the complex multi‐drain systems for spatially variable soils has never been addressed in the literature. In this study, a rigorous stochastic finite elements modeling approach that allows the true nature of soil spatial variability to be considered in a reliable and quantifiable manner, both for the single‐drain and multi‐drain systems, is presented. The feasibility of performing an analysis based on the unit cell concept as compared with the multi‐drain analysis is assessed in a probabilistic context. It is shown that with proper input statistics representative of a particular domain of interest, both the single‐drain and multi‐drain analyses yield almost identical results. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

红海湾水质营养状况及其频率分析     

《广东海洋大学学报》1999,(3)

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