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91.
92.
三维相干切片断层多边形检测 总被引:7,自引:2,他引:7
作者在本文中将三维切片视为二维图像,利用图像边缘检测技术,检测出相干切片上断层多边形,并将其直接投影到测网底图上,用于构造成图。该项技术不仅提高了用相干切片解释断层的精度,而且提高了断层解释效率,使相干数据体技术在三维解释中的作用得到更大的发挥。实际应用表明,三维相干切片断层多边形检测技术,是全三维高精度解释的有力工具,提高了解释效率,缩短了解释周期。 相似文献
93.
94.
介绍了超文本电子地图集系统HEAS的若干概念,分析了现有地理信息系统的优点和弱点,介绍了超文本电子地图集系统的特性和武测超文本电子地图集实验系统方面的研究成果。 相似文献
95.
Zhang Zeming You Zhendong Han Yujing Yang Weiran Wei BizeFaculty of Earth Sciences China University of Geosciences Wuhan 《中国地质大学学报(英文版)》1995,(2)
There are four units of high-pressure to ultrahigh-pressure metamorphism extending from south to north across the Tongbai-Dabie Mountains: the epidote-blueschist-facies unit, the low-temperature eclogite facies unit , the ultrahigh-pressure eclngite facies unit and the medium-temperature eclogite facies unit . The later two units were formed during the Caledonian subduction between the Tongbai-Dabie microplate and the North China plate ,the former two units are the products of Indosinian continental-continental subduction and collision between the Yangtze and the North China plates. 相似文献
96.
严密的推理和大量精确的计算结果,揭示了IP效应对EM响应的影响.在野外常见的极化条件下,在电磁法工作频率范围(1~1000Hz)内,绝对影响过极大值.相对影响可达10%以上.充电率m越大.极化时间常数T对球体本身的感应时间常数r之比越小、频率响应系数c越小.影响越大,山响的频率越高. 相似文献
97.
You YI Zhaonan CAI Yi LIU Shuangxi FANG Yuli ZHANG Dongxu YANG Yong WANG Miao LIANG Maohua WANG 《大气科学进展》2020,37(6):608-616
The balloon-borne Aircore campaign was conducted in Inner Mongolia,China,on June 13 and 14 2018,which detected carbon dioxide(CO_2) and carbon monoxide(CO) profiles from surface to 24 km,showing strong positive and negative correlations between 8 km and 10 km on 13 and 14 June,respectively.Backward trajectories,meteorological analyses,and CO_2 horizontal distributions were combined to interpret this phenomenon.The results indicated that the source region experienced a stratospheric intrusion and exhibited a large horizontal CO_2 gradient;namely,lower CO concentrations corresponded to higher CO_2 concentrations and vice versa.The laminar structure with multiple origins resulted in the highly negative correlation between CO_2 and CO in the upper troposphere on 14 June.The contribution of stratospheric air mass to the upper troposphere and that of tropospheric air mass to the lower stratosphere were 26.7% and24.3%,respectively,based on a mass balance approach.Another interesting phenomenon is that CO_2 and CO concentrations increased substantially at approximately 8 km on 13 June.An analysis based on the backward trajectory implied that the air mass possibly came from anthropogenic sources.The slope of CO_2/CO representing the anthropogenic sources was 87.3 ppm ppm~(-1).In addition,the CO_2 profile showed that there was a large CO_2 gradient of 4 ppm km-1 within the boundary layer on 13 June,and this gradient disappeared on 14 June. 相似文献
98.
We analyzed the spectrum of a coronal condensation observed during the total eclipse of 1983 June 11. Under the assumption of rotational symmetry we found the distributions of the electron density and the temperature. The electron density was higher in the centre of the condensation than on the edge. From different line pairs the maximum electron density was found to be between 1.7 3.5×109cm−3 while the temperature was found to be basically uniform at 1.7 2.7×106K. The turbulence velocity was 15 35km/s. The systematic flow of the condensation region with respect to the quiet corona was not more than 15km/s. Discussion of the instrumental profile showed that its effect was small on lines that were much wider than the profile. 相似文献
99.
You Jun-han 《Chinese Astronomy and Astrophysics》1983,7(4):315-321
This paper deals with the radio spectra of synchrotron sources with spherically symmetric non-homogeneities. It is pointed out that the Type-c spectra can be produced by such a non-homogeneity even if the source is optically thin. This model is particularly advantageous in interpreting sources with no compact characteristics and yet showing a Type-c spectrum, and the observed decrease in source size with increasing frequency. In addition, it is possible to give a uniform interpretation of the four spectral types on the basis of such a non-homogeneity. 相似文献
100.