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11.
The resistivity method is often used in cave prospecting. In this paper the pole–dipole array ability to detect cavities at different depths and with different water contents is investigated. The research was performed using analogical and numerical modelling. According to the results, empty caves at a depth less than four times its diameter can be easily detected. The ability of the pole–dipole array to detect water-filled caves reaches a minimum at filling percentages of 30–50%. Overburden effects research shows that low resistivity overburden reduces the resolution capability of the array. This study shows that equivalent results can be obtained by modelling the empty caves as infinite resistivity bodies or, alternatively, as very high resistivity ones. The analysis of field data acquired in the Maciço Calcário Estremenho (Portugal) shows the practical importance of the pole–dipole array in cavities prospecting. 相似文献
12.
13.
桂林洞穴滴水对应CaCO3沉积物的稳定同位素特征与环境意义 总被引:2,自引:0,他引:2
桂林地区降水及茅茅头大岩滴水滴速和现代碳酸盐的碳氧同位素研究表明:(1)滴水沉积的δ18O达到了同位素沉积平衡,洞穴滴水的δ18O与同期降雨的δ18O值呈正相关关系;(2)在旱季和湿季交替时,滴水δ18O值滞后于降雨δ18O,受活塞效应的影响;(3)δ13C难以达到同位素沉积平衡,主要受滴水动力学影响;(4)同一洞穴不同滴水对环境的响应不同,如果洞穴顶板覆盖较厚,水分在土壤和岩层中滞留时间较长,滴水则反映受到平滑作用的降雨,反之则波动较大. 相似文献
14.
15.
利用在全球不同海域的船载GNSS进出港数据,以事后动态处理技术(PPK)的坐标计算值为评价基准,分析了Veripos星站差分系统和事后动态精密单点定位技术(PPP)在不同运动状态下的位置服务精度。结果表明,Veripos与PPP在低动态下的平面与高程位置服务精度可优于6.2 cm和14.9 cm,在常规动态下平均精度优于20 cm;PPP与Veripos坐标分量平均互差小于15 cm,标准差小于23 cm,在深远海调查中PPP技术可作为星站差分系统的有效补充和特殊情况下的位置服务替代。 相似文献
16.
宋国玄 《中国天文和天体物理学报》1989,(1)
巨分子云的碰撞造成了大质量恒星在碰撞分子云中的形成,这些大质量恒星的形成产生了膨胀的HII区域,从而使巨分于云碎裂成小质量的分子云。这是本文提出的巨分子云碎裂机制。因此巨分子云的寿命也主要由区分子云间的碰撞几率所决定。我们的分析表明,巨分子云的寿命有赖于巨分子云所在的旋涡星系中的不同位置。寿命的最大可能存在区间为8.18×10~7yr与2.45×10~8yr。利用我们提出的机制可以在分子云研究的数值计算与数值模拟中得到应用。 相似文献
17.
L. Tanvuia W.W. Zeilinger P. Focardi B. Kelm R. Rampazzo 《Astrophysics and Space Science》2003,284(2):459-462
This is a study concerning the investigation of galaxy formation and evolution in small-scale structures and the influence
of the environment on the properties of galaxies. The environment plays a key role in the evolution of galaxies since it governs
the type of encounters. We present results from low-resolution spectroscopy and R-band surface photometry of multiplets of
galaxies found in low-density environments and compare them to cluster environments. Properties such as induced galaxy activity,
star formation enhancements, AGN activity and the connection between merging and galaxy morphology are investigated.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
18.
Calibrating the GOCE accelerations with star sensor data and a global gravity field model 总被引:1,自引:0,他引:1
A reliable and accurate gradiometer calibration is essential for the scientific return of the gravity field and steady-state
ocean circulation explorer (GOCE) mission. This paper describes a new method for external calibration of the GOCE gradiometer
accelerations. A global gravity field model in combination with star sensor quaternions is used to compute reference differential
accelerations, which may be used to estimate various combinations of gradiometer scale factors, internal gradiometer misalignments
and misalignments between star sensor and gradiometer. In many aspects, the new method is complementary to the GOCE in-flight
calibration. In contrast to the in-flight calibration, which requires a satellite-shaking phase, the new method uses data
from the nominal measurement phases. The results of a simulation study show that gradiometer scale factors can be estimated
on a weekly basis with accuracies better than 2 × 10−3 for the ultrasensitive and 10−2 for the less sensitive axes, which is compatible with the requirements of the gravity gradient error. Based on a 58-day data
set, scale factors are found that can reduce the errors of the in-flight-calibrated measurements. The elements of the complete
inverse calibration matrix, representing both the internal gradiometer misalignments and scale factors, can be estimated with
accuracies in general better than 10−3. 相似文献
19.
吉林省岩溶洞穴旅游资源及其开发中的问题讨论 总被引:2,自引:0,他引:2
近年来,在吉林省中部和东南部地区,发现了一批岩溶洞穴,尚未开发利用者为多数,它们分布在奥陶系马家沟组灰岩和石炭系磨盘山组石灰岩中,规模多为中小型,个别较大,具有开发意义,建议从速开发,面向旅游事业,为振兴吉林省经济服务。 相似文献
20.
Martin Laverty 《地球表面变化过程与地形》1987,12(5):475-480
The analysis of cave survey data is used to establish that cave length exhibits fractal (self-similar) behaviour, with dimensions in the range 1–1·5, over a range of measurement resolutions from 1 to 100 m. It is suggested that fractal dimensions, together with their range of applicability, will prove to be useful parameters for the study of caves. 相似文献