物化探在保山核桃坪矿床中的综合应用     

杨孝武  官德任 《云南地质》2011,30(1):78-82

核桃坪铅锌铜多金属矿的靶区选择、评价及矿床发现中,由浅入深的物化探工作,在8个综合物化探异常区都找到多金属硫化物矿体,金厂河矿区实现隐伏深部找矿的重大突破。并总结出了一套合理的找矿勘查技术。  相似文献   

甚低频(VLF)法在固体矿产普查中的应用及效果     

及炳祥  郭永波 《国土资源》1990,(2)

作者在辽东地区把甚低频(VLF)法应用于金矿、硼镁铁矿、铜矿、钼矿和煤矿的普查勘探工作中。通过6个矿区,9条VLF剖面的测量,发现VLF法在固体矿产普查中异常显著,并与已知矿体吻合,找矿效果较好。应用VLF法不公可以发现良导体矿,而且可以确定矿体的产状、规模和矿体叠加状态。VLF法应用于普查表层矿产,其效果更为显著。  相似文献   

Scientific CMOS Pixels   总被引：1，自引：0，他引：1  

James Janesick  Ferry Gunawan  Taner Dosluoglu  John Tower  Niel McCaffrey 《Experimental Astronomy》2002,14(1):33-43

High performance CMOS pixels are introduced; and their development is discussed. 3T (3-transistor) photodiode, 5T pinned diode, 6T photogate and 6T photogate back illuminated CMOS pixels are examined in detail, and the latter three are considered as scientific pixels. The advantages and disadvantages of these options for scientific CMOS pixels are examined. Pixel characterization, which is used to gain a better understanding of CMOS pixels themselves, is also discussed. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

传感器放置深度对水温动态特征的影响及其机理分析     

陈其峰  车用太  刘允  冯恩国  温丽媛 《地震》2022,42(1):169-180

地热井的观测规范要求尽可能将水温传感器放置在井下深处, 一般放置深度应当大于100 m, 小于200 m。 然而, 近几年的观测结果表明, 水温传感器的放置深度对水温动态特征的影响较大。 在多数观测井中, 同井水温与水位的时值动态、 潮汐效应、 同震响应及震后阶变等动态特征的相关性或一致性, 多与水温传感器的放置深度有关。 本文主要探讨了传感器放置深度对水温动态特征的影响, 水温传感器放置在观测含水层中, 都受井—含水层间水流运动的影响, 会造成水温动态随井水位变化而变化; 当放置在观测含水层下部时, 水温动态则不受井水位变化的影响, 多表现为动态相对稳定。 其原因是水温动态的形成受水热动力学与地热动力学两种不同机制的控制, 此外, 井—含水层系统的条件也会产生影响。  相似文献   

中国大陆1996 ～ 2012 年地震重点监视防御区制度实施现状与成效分析     

晁洪太  高孟潭  李波  陈时军  梁凯利  马玉香  王峰  伍国春  郎从  吴新燕 《中国地震》2014,30(3):306-316

地震重点监视防御区制度,是《中华人民共和国防震减灾法》确立的法律制度.在地震重点监视防御区制度实践方面,我国已完成第一期地震重点监视防御区方案的实施,即1996年国务院批准的1996 ～2005年全国地震重点监视防御区方案.目前,正在实施的是第二期地震重点监视防御区方案,即2006年国务院批准的2006 ～2020年全国地震重点监视防御区方案.在国家社科基金重大项目支持下,本文对1996～ 2012年全国地震重点监视防御区制度的实施现状进行了追踪,对实施成效进行了总结.从1996～ 2012年的震例和调查数据看,减灾效果明显.在此基础上,提出了完善地震重点监视防御区制度的对策与建议.  相似文献   

压力对橄榄石流变性的影响   总被引：2，自引：4，他引：2  

赵永红  王中言  David F BRUHN  David L KOHLSTEDT 《岩石学报》2003,19(3):577-582

本文给出细粒橄榄石集合体在位错蠕变域中压力效应的实验结果。对干燥、人工合成的橄榄石集合体进行了三轴压缩实验,试验在一台高分辨率的气体介质试验机上进行。典型的常载荷蠕变试验温度为1473K或1523K,围压为400MPa、200MPa、400MPa、200MPa。当差压力和温度给定时,试件在400MPa围压下,变形速度较200MPa围压下要慢。实验得出的细粒橄榄石集合体在位错蠕变域中的活化体积值为(23±3)×10~(-6)m~3/mol。最后,对实验结果在地幔动力学中的应用进行了讨论。  相似文献   

Effect of Aftershocks on Assessment of Seismic Hazard for Hebei Seismic Zone,China   总被引：1，自引：0，他引：1  

Liu Zhihui  Fu Zhengxiang  Jin Xueshen  Shao Huicheng  Zhu Ailan 《中国地震研究》2002,16(2):160-166

In this paper,the earthquake hazard parameters(λm,b and Mmax) from the maximum likelihood method for the raw catalogue and declustered catalogues have been used to discuss the effect of the aftershocks on the earthquake hazard estimation.The declusterd catalogues have been compoiled from the raw catalogues by deleting the aftershocks in different time interval after main shock according to the criteria for the aftershock activity period.As an example,Hebei seismic zone is taken to show the effect of the aftershock on the earthquake hazard assessment because three strong earthquakes with the aftershocks occurred from 1966,to 1976,The results have been shown that the effect of the aftershocks on the parameters λm,b is significant.The difference between the clustered and declustered catalogues has reached in seismic activity rate and recurrence period,at most,45% and 90%,respectively,But the diffeence in Mmax is smaller,Based on this,the suggestion that the aftershocks should be omitted in the estimation of the earthquake hazard could be made,but how long the aftershocks activity duration is still left to the future research.  相似文献   

Seismological Activities in Laos     

NitharatSomsanith  SounadethSoukchaleun 《中国地震研究》2002,16(3):221-222

This report describes briefly the natural conditions and effect of earthquakes in Laos,Though Laos is not severely affected by earthquakes,it is doing its best to start seismological activity through the bilateral cooperation with China and with other ASEAN countries and through the framework of ASEAN-China cooperation.  相似文献   

Sunspot numbers and area-weighted united states monthly temperature and precipitation     

Robert S. Weinbeck  Douglas N. Yarger 《Pure and Applied Geophysics》1980,119(4):798-808

Spectral analyses were made of derived area-index series of areas subject to extreme temperatures and precipitation as well as cross-spectral analyses of the area-index series with double sunspot cycle (Zurich) numbers. Superposed epoch analyses also were made of area-index series versus various double-sunspot cycle phases. Area series for wet and dry Junes, warm Junes, defined June drought, and warm Januaries all show statistically significant double sunspot cycle (21 year) periodicities. The 21-year cycle of above-normal June precipitation is most striking and has not received previous recognition.Journal Paper No. J-10007 of the Iowa Agric. and Home Econ. Exp. Stn., Iowa State University, Ames, IA, 50011, Project 2397.  相似文献   

永安地磁台地磁总强映震效果初探     

黄跃进  许书元  周福昌 《福建地震》2002,(1)

本文针对我省“十五”要进行的地震前兆观测台网改造 ,通过对 1 990年以来我省及邻近地区中强以上地震前永安地磁变化的分析 ,初步总结了永安地磁手段在我省中强以上地震映震效果  相似文献