普朗铜矿外围找矿方向     

吴维虎 《云南地质》2011,30(4):404-406,403

普朗岩体外接触带,与热液活动密切相关,受构造裂隙控制,大脉状产出,可寻找大脉型矿体。而北部向深部寻找与斑岩有关的矿体;西南部则可寻找角岩化带矿体。  相似文献   

云南沧源羊缅金矿成因     

高李阳  王爱萍 《云南地质》2011,30(3):273-274

羊缅金矿位于昌宁-孟连有色金属贵金属成矿带,金矿受压扭性断裂控制,分布于变余辉长辉绿岩中,典型的低温热液蚀变型金矿床。  相似文献   

桥梁基础挖方计算方法探讨     

殷鹏程 《中国勘察设计》2011,(5):50-53

本文针对山区铁路桥梁,利用墩台纵横向的实际勘测数据,通过假设墩台附近范围内地形纵横向变化的连续性建立斗形空间几何体计算模型,根据简单多边形面积公式及拟台体体积公式,提出了墩台基础挖方量的计算方法并通过程序实现。  相似文献   

高精度磁测在单县龙王庙地区铁矿调查中的应用     

赵法强  曹秀华  庞绪贵  臧凯  孙立业 《山东地质》2011,(8):23-26,30

阐述了高精度磁测在单县龙王庙地区铁矿调查评价中的应用,高精度磁测的目的是分解早期1∶5万航磁异常,细致反映龙王庙地区磁异常的分布,为该区的铁矿调查评价和成矿预测提供了基础资料。以近年来的高精度磁测工作为基础,该区铁矿深部找矿取得了重大突破,勘查发现了大刘庄大型沉积变质型铁矿,并进行了富有价值的成矿预测,显示出了良好的地质效果。  相似文献   

Swashed away? Storm impacts on sandy beach macrofaunal communities     

Linda Harris  Ronel Nel  David Schoeman 《Estuarine, Coastal and Shelf Science》2011,94(3):210-221

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Short-term residence and movement patterns of the annular seabream Diplodus annularis in a temperate marine reserve     

David March  Josep Als  Amlia Grau  Miquel Palmer 《Estuarine, Coastal and Shelf Science》2011,92(4):251-587

The short-term movements of a small temperate fish, the annular seabream Diplodus annularis (Linnaeus 1758), were examined using standard tag-recapture and passive acoustic telemetry in Palma Bay (NW Mediterranean), a marine protected area (MPA). The study aimed to provide valuable information for assessing the recreational fishery and its results suggest that MPAs can be used to protect the adult stock of D. annularis. All the fish tagged with standard tags were recaptured near the release locations, with a maximum distance of ∼300 m. The maximum time between release and recapture was 185 d. Two different arrays of acoustic receivers were deployed, one in 2008 and another in 2009, within the MPA. Twenty adults were surgically tagged with acoustic transmitters. Fish monitored in 2008 (n = 12) were translocated from the point of capture to analyse the movement behaviour after artificial displacement. Upon release at displaced locations, 67% of the fish moved towards the original capture location using a time of return that ranged from 0.75 to 15.25 h. Fish monitored in 2009 (n = 8) were released at the point of capture. They showed high site fidelity with a maximum period of 27 d between the first time and the last time they were detected.  相似文献   

An installation system of deepwater risers by an S-lay vessel     

段梦兰  王懿  何宁  李丽娜  陈邦敏 《中国海洋工程》2011,25(1):139-148

Along with the consumption increase of the petroleum products,more countries have transferred their attentions to the offshore fields,especially the deepwater oil and gas reserves.For deepwater exploitation,the risers must be installed to act as the conduits connecting surface platforms to subsea facilities.In this paper,the typical risers sorted by different classes are introduced,and the correspondent installation methods are presented.By investigating the recent projects performed in the deepwater hot spots,and combining the challenges of HYSY201 for riser installation,a lifting device developed for assisting riser installation is proposed and detailed to satisfy the installation of deepwater risers in the LW3-1 Gas Field of in the South China Sea.Tests on both the functions and performances of such a new system exhibit the satisfaction of meeting all challenging requirements of HYSY201 for application to riser installation in waters up to a depth of in the South China Sea.  相似文献   

中国南海涠洲油田W114A平台服役15年的水下钢结构腐蚀防护调查   总被引：2，自引：1，他引：1       下载免费PDF全文

姚平  鲍祺  赵霞  段继周  马士德 《海洋科学》2011,35(1):54-58

介绍了W114A平台在南海服役15年的水下钢结构的腐蚀与防护特检报告.检测表明,生物污损严重,最大附着厚度可达20 cm,阴极保护系统正常,保护效果良好.对检测方法和结果进行了分析发现,电位测量程序不妥,牺牲阳极物理尺寸的测量方法不准确,测厚点的基面清理不干净,不能准确地对平台的阴极防护效果进行评估,并对此提出了修改意...  相似文献   

对照组和雌核发育牙鲆血清中睾酮与雌二醇水平的比较     

孙鹏  尤锋  李军  宋宗城  张培军 《海洋科学》2011,35(12):10-14

采用放射性免疫方法测定和比较了人工诱导的雌核发育牙鲆（Paralichthys olivaceus）与对照组牙鲆血清中睾酮（T）和雌二醇（E2）水平。研究发现, 雌核发育牙鲆个体中的T 含量显著高于对照组牙鲆个体（P〈0.05）, 而其E2 含量则略低于对照组个体; 在雌核发育牙鲆中, 卵巢发育不正常的个体比发育正常的...  相似文献   

浅海导管架平台结构损伤诊断试验研究     

刘杰鸣  李绂  黄维平  石湘 《海洋工程》2011,29(4):37-42

基于模型试验研究了浅海导管架平台的结构损伤诊断,采用标量型ARMA模型识别出结构的三阶模态参数,分别采用遗传算法和模态应变能法对试验模型不同模拟损伤工况进行了损伤诊断。基于遗传算法,提出了采用不同自由度一阶模态参数的损伤诊断方法。研究表明,由于海洋平台的前三阶模态分别为不同自由度的一阶模态,采用两阶或三阶模态识别损伤时,损伤杆件影响较小的自由度方向的模态参数对结构的损伤诊断将产生不利的影响,成为识别噪声。因此,可分别采用不同自由度的一阶模态进行结构损伤诊断。  相似文献