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贵州台江中寒武世凯里组的疑难化石Triplexa(三分壳)
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作者 赵元龙 周震 +1 位作者 陈笑媛 郭庆军 《微体古生物学报》 CSCD 北大核心 1998年第1期55-63,共9页
凯里动物群有一些分类位置暂不能确定的疑难化石,Triplexa(gen.nov.)就是其中的一个属,其标本超过300多件。Triplexa由左右两瓣壳组成,体小,最大直径仅几毫米,呈扁球形。壳内被两条纵向弧形沟分成轴... 凯里动物群有一些分类位置暂不能确定的疑难化石,Triplexa(gen.nov.)就是其中的一个属,其标本超过300多件。Triplexa由左右两瓣壳组成,体小,最大直径仅几毫米,呈扁球形。壳内被两条纵向弧形沟分成轴部及两个侧叶,形同水字形。Triplexa仅与棘皮动物的某些萼板相似,但Triplexa个体小,呈小扁球体,壳内部构造三分性极为明显,易于区别。Triplexa可能是某一门类动物的部件或器官。小而中空的壳体,显示可以漂浮,并非原地埋藏。 展开更多
关键词 三分壳 疑难化石 凯里动物群
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Three-dimensional analysis of natural convection in nanofluid-filled parallelogrammic enclosure opened from top and heated with square heater 被引量:1
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作者 Abdullah A.A.A AL-RASHED Walid HASSEN +3 位作者 Lioua KOLSI Hakan F. OZTOP Ali J. CHAMKHA Nidal ABU-HAMDEH 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1077-1088,共12页
A numerical study based on the finite volume method has been performed to study the three-dimension natural convection in a parallelogrammic top side opened cavity filled nanofluid with partially heated square at the ... A numerical study based on the finite volume method has been performed to study the three-dimension natural convection in a parallelogrammic top side opened cavity filled nanofluid with partially heated square at the bottom side.Results are obtained for different governing parameters such as nanoparticle concentration (φ) from 0 to 0.05,inclination angle of the back and front walls (α) from 5° to 75°,Rayleigh number from 10^3 to 10^5,and length of heater changer from 0.1 to 1.The main finding from the obtained result showed that the inclination angle and nanoparticle volume fraction affect the flow structure and enhance the heat transfer. 展开更多
关键词 3D analysis open enclosure partial heating PARALLELOGRAM nanofluids
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