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排序方式: 共有160条查询结果,搜索用时 78 毫秒
91.
藏北羌塘中部冈塘错花岗岩体中环带条纹钾长石巨斑晶的特征 总被引:1,自引:0,他引:1
冈塘错花岗岩体是分布于西藏双湖角木日地区的一套晚三叠世酸性侵入岩。于2008年1∶5万区域地质调查填图中首次发现该岩体中的中粗粒巨斑状含黑云母二长花岗岩中的巨斑晶为环带条纹钾长石。主要描述了该岩体中环带条纹钾长石巨斑晶的矿物学、岩石学特征,利用电子探针详细分析了环带条纹钾长石巨斑晶从核部到边缘的成分变化特征,运用二长石温度计简单地计算了斑晶的结晶温度。根据斑晶的化学成分变化特征和结晶温度,结合岩体的岩石学、地质学特征,初步确定该岩体为岩浆混合作用的产物。 相似文献
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We present a series of experimental investigations in which a differentially-heated annulus was used to investigate the effects of topography on rotating, stratified flows with similarities to the Earth’s atmospheric or oceanic circulation. In particular, we compare and investigate blocking effects via partial mechanical barriers to previous experiments by the authors utilising azimuthally-periodic topography. The mechanical obstacle used was an isolated ridge, forming a partial barrier, employed to study the difference between partially blocked and fully unblocked flow. The topography was found to lead to the formation of bottom-trapped waves, as well as impacting the circulation at a level much higher than the top of the ridge. This produced a unique flow structure when the drifting flow and the topography interacted in the form of an “interference” regime at low Taylor number, but forming an erratic “irregular” regime at higher Taylor number. The results also showed evidence of resonant wave-triads, similar to those noted with periodic wavenumber-3 topography by Marshall and Read (Geophys. Astrophys. Fluid Dyn., 2015, 109), though the component wavenumbers of the wave-triads and their impact on the flow were found to depend on the topography in question. With periodic topography, wave-triads were found to occur between both the baroclinic and barotropic components of the zonal wavenumber-3 mode and the wavenumber-6 baroclinic component, whereas with the partial barrier two nonlinear resonant wave-triads were noted, each sharing a common wavenumber-1 mode. 相似文献
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Lien-Kuang CHEN Su-Chin CHEN 《国际泥沙研究》2006,21(2):113-122
1 INTRODUCTION A headcut, which is an abrupt break in the slope of a channel bed, is often called a “knickpoint” or “scarp” in the study of rivers and waterways. A headcut tends to retreat upstream as water flows over it. As a headcut passes a cross s… 相似文献
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D. Kramer 《Astronomische Nachrichten》1988,309(4):267-272
The minimal surface interpretation of rigidly rotating perfect fluids in General Relativity is extended to include the more general case of differential rotation. The minimal surface corresponding to the Kerr solution is given. 相似文献
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单管高压旋喷桩加固软土地基的应用 总被引:5,自引:1,他引:4
介绍了单管高压旋喷桩加固软土地基的应用 ,主要叙述单管高压旋喷技术的施工工艺、技术参数、检测结果及注浆机理分析等。 相似文献