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51.
In the geological evolution of the Tarim Basin, many transgressions and relictions happened. So there have been plentiful sources of salt. Moreover, because of uttermost drought, a lot of salt has been deposited. It is possible to find potash salt in this area. In our fieldwork, we have found salt and brine in western Tarim Basin. Based on a geological survey and the characteristics of sedimentary facies and paleogeography, this paper deals with the geochemical parameters and discusses the possibility of formation of potash salt in terms of the chemical analyses of samples collected from western Tarim Basin. Results of brine analysis lead to some conclusions: most of these salt brines have eluviated from very thick halite beds, mainly chloridetype salt and this kind of halite does not reach the stage of potash deposition in all aspects; WKSL (Wukeshalu) occupies a noticeable place, and we should attach importance to this district because there have been some indicators of the occurrence of potash deposits as viewed from the contents of Br and K. Finally, low Br contents are recognized in the Tarim Basin as a result of salt aggradation, and this point of view has been proved by the results of this experiment and the data available. It cannot depend upon the index of Br to judge the evolution stage of halite. We must look for other facies of potash except marine facies. 相似文献
52.
基于U型卷积神经网络的航空影像建筑物检测 总被引:1,自引:2,他引:1
经典的卷积神经网络结构在前向传播过程中分辨率不断下降,导致仅采用末层特征时难以实现建筑物边缘的精确分割,进而限制目标检测精度。针对该问题,提出一种基于U型卷积网络的建筑物检测方法。首先借鉴在图像分割领域中性能出色的神经网络模型U-Net的建模思想,采用对称式的网络结构融合深度网络中的高维和低维特征以恢复高保真边界;其次考虑到经典U-Net对位于特征金字塔顶层的模型参数优化程度相对不足,通过在顶层和底层两个不同尺度输出预测结果进行双重约束,进一步提升了建筑物检测精度。在覆盖范围达30 km2、建筑物目标28 000余个的航空影像数据集上的试验结果表明,本文方法的检测结果在IoU和Kappa两项关键评价指标的均值上分别达到83.7%和89.5%,优于经典U-Net模型,显著优于经典全卷积网络模型和基于人工设计特征的AdaBoost模型。 相似文献
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本文以极冠模型为基础,计算了脉冲星γ射线辐射光度,指出对不同的脉冲星必须考虑辐射立体角和可见辐射区对观测光度的影响.考虑了这些观测效应后,计算的光度和观测值基本符合.预言了一些可能的γ射线脉冲星,并对其性质进行了研究. 相似文献
55.
???????????????????????????????????????????????????1999-2008????????????仯??????????????????????????????????????????????仯??????????????????????????в?????????????????????????????????????????????????????????? 相似文献
56.
????1998?????????й??????????????????????????2008??3?????????7.3?????????????????????仯?????????????????????????????????????????????????????г????2~10???????????????????????????????????????????????????仯?????????????????????仯????????????????????????????????????????????????????????????????????????????????仯?????????????????????????????1976?????7.8????????????????????????й?????8?????????????仯??200??10 -8 ms -2 ?? 相似文献
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Deepwater sediments are prone to loss circulation in drilling due to a low overburden gradient. How to predict the magnitude of leak-off pressure more accurately is an important issue in the protection of drilling safety and the reduction of drilling cost in deep water. Starting from the mechanical properties of a shallow formation and based on the basic theory of rock-soil mechanics, the stress distribution around a borehole was analyzed. It was found that the rock or soil on a borehole is in the plastic yield state before the effective tensile stress is generated, and the effective tangential and vertical stresses increase as the drilling fluid density increases; thus, tensile failure will not occur on the borehole wall. Based on the results of stress calculation, two mechanisms and leak-off pressure prediction models for shallow sediments in deepwater drilling were put forward, and the calculated values of these models were compared with the measured value of shallow leak-off pressure in actual drilling. The results show that the MHPS (minimum horizontal principle stress) model and the FIF (fracturing in formation) model can predict the lower and upper limits of leak-off pressure. The PLC (permeable lost circulation) model can comprehensively analyze the factors influencing permeable leakage and provide a theoretical basis for leak-off prevention and plugging in deepwater drilling. 相似文献
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60.
The suitability of using leaf area index to quantify soil loss under vegetation cover 总被引:1,自引:0,他引:1
Wentai Zhang Dongsheng Yu Xuezheng Shi Hongjie Wang Zhujun Gu Xiangyan Zhang Manzhi Tan 《山地科学学报》2011,8(4):564-570
Soil erosion by water under forest cover is a serious problem in southern China. A comparative study was carried out on the
use of leaf area index (LAI) and vegetation fractional coverage (VFC) in quantifying soil loss under vegetation cover. Five
types of vegetation with varied LAI and VFC under field conditions were exposed to two rainfall rates (40 mm h−1 and 54 mm h−1) using a portable rainfall simulator. Runoff rate, sediment concentration and soil loss rate were measured at relatively
runoff stable state. Significant negative exponential relationship (p < 0.05, R2 = 0.83) and linear relationship (p < 0.05, R2 = 0.84) were obtained between LAI and sediment concentration, while no significant relationship existed between VFC and sediment
concentration. The mechanism by which vegetation canopy prevents soil loss was by reducing rainfall kinetic energy and sediment
concentration. LAI could better quantify such a role than VFC. However, neither LAI nor VFC could explain runoff rate or soil
loss rate. Caution must be taken when using LAI to quantify the role of certain vegetation in soil and water conservation. 相似文献