排序方式： 共有28条查询结果，搜索用时 61 毫秒
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为了探查新疆昭苏盆地砂岩型铀矿的异常信息,选择可控源音频大地电磁测量、高精度磁测和土壤氡气测量三种物探方法,并简要介绍各方法的工作原理。通过分析昭苏盆地的地质特征、物性特征和本区的找矿难点,对昭苏盆地综合物探数据所蕴含的信息进行地质-物探综合解译。实践证明:可控源音频大地电磁测量对低阻和高阻体均有良好的电性响应,可以划分地层、推断断裂构造;高精度磁测可以推断氧化还原界面,辅助解释断裂构造;土壤氡气测量可辅助解释断裂构造,对地下铀矿体有指示作用,三种方法的技术特性相互补充,提高了物探解释的准确性。突破了伊犁盆地以往600 m的找矿深度,并以电性稳定的中阻厚层、磁测异常、氡异常偏高晕和峰-谷状曲线作为预测标志,解决了深埋藏条件下赋矿地质体的圈定难点,在昭苏盆地砂岩型铀矿中、深部找矿工作中取得了良好的效果。 相似文献
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数字影像中角点与直线的高精度定位算子 总被引：8，自引：0，他引：8
本文在分析现有数定影像定位算子的基础上，提出了精确定位数字影像中角点与直线的高精度定位算子。这种算子通过精确定组成角点的两条直线，从而精确定位角点。实验表明，新的定位算子有很高的定位精度，在理想情况下，新定位算子的精度可达０．０２像素，最后，客种算子被用于数字影像的相对定向，取得了令人满意的结果。 相似文献
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高精度磁测在山西省繁峙吐楼铁矿区勘探中的应用 总被引：1，自引：0，他引：1
该文阐述了高精度磁测工作在山西省繁峙吐楼铁矿区的应用,其高精度磁测目的是查清异常分布,查找隐伏铁矿体,圈定铁矿体分布范围、矿体位置、形态、大小、产状、边界等几何特征及查明矿区地质特征,根据现有探采工程揭露控制,初步估算了铁矿石资源量。 相似文献
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We investigate repeating aftershocks associated with the great 2004 Sumatra–Andaman (Mw 9.2) and 2005 Nias–Simeulue (Mw 8.6) earthquakes by cross-correlating waveforms recorded by the regional seismographic station PSI and teleseismic stations. We identify 10 and 18 correlated aftershock sequences associated with the great 2004 Sumatra and 2005 Nias earthquakes, respectively. The majority of the correlated aftershock sequences are located near the down-dip end of a large afterslip patch. We determine the precise relative locations of event pairs among these sequences and estimate the source rupture areas. The correlated event pairs identified are appropriately referred to as repeating aftershocks, in that the source rupture areas are comparable and significantly overlap within a sequence. We use the repeating aftershocks to estimate afterslip based on the slip-seismic moment scaling relationship and to infer the temporal decay rate of the recurrence interval. The estimated afterslip resembles that measured from the near-field geodetic data to the first order. The decay rate of repeating aftershocks as a function of lapse time t follows a power-law decay 1/tp with the exponent p in the range 0.8–1.1. Both types of observations indicate that repeating aftershocks are governed by post-seismic afterslip. 相似文献
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The Barrell and Sears and Edlen formulae use the Sellmeier form away from resonances, which gives a “smooth” dependence within
the visible and near-infrared spectra. All known atlases indicate numerous resonances in these regions, which cause local
disturbance of the dispersion curve. Anomalous dispersion may be estimated from an absorption by the Kramer-Kronig ratios.
It gives a change of phase refractive index of air in a range from several ppt to 1 ppb within narrow optical regions, causing
large local dispersions. Computation of the group refractive index with the use of Rayleigh's ratio shows that the influence
of resonance effects may be more than several ppm. For example, the error of the group refractive index for high-precision
EDM using HeNe lasers (633 nm) varies between 0.2 and 0.7 ppm, depending on the laser stability.
Received: 17 July 1996 / Accepted: 27 March 1997 相似文献
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H. Kjeldsen 《Astrophysics and Space Science》2003,284(1):1-12
Measuring eigenfrequencies and identifying eigenmodes provide the observational basis for a significant improvement in our understanding of stellar evolution and structure.Development throughout the last few years show that we may be at the dawn of a `Golden Age'for Asteroseismology. For this to become a reality we only need two things:Better data and better models. In this paper I describe some aspectsof how one detects stellar oscillations. 相似文献
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高精度磁测在云南省德宏州某地区的应用,取得了较好的效果。采用规范的地面高精度磁测方法,取得可靠的磁测数据,圈定出磁异常。经过对资料处理与定性分析解释,推断出磁异常的成因,为开展下一步地质工作和找矿远景预测,提供了有效的地球物理依据。 相似文献