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plume dynamics and dispersion characteristics in oil horizontal release from damaged submarine pipeline

Chinese Journal of Chemical Engineering 2020年第5期28卷 1214-1224页

作者： Jun Zhang Hongzhou He Shaohui Yang Fujian Province Key Laboratory of Energy Cleaning Utilization and Development Xiamen 361021China Key Laboratory of Ocean Renewable Energy Equipment School of Mechanical EngineeringJimei UniversityXiamen 361021China

The dynamics model of plume for underwater oil spill is improved by considering the drag force of the *** comparisons between prediction and experiment show that the improved model is *** improved model combining the Lagrangian random walk method is used to simulate the entire oil transport process from release exit to water surface in underwater oil horizontal release and some new results are ***,the release rate,the current velocity and its direction have evident influence on plume *** plume length increases as release flow rate *** small oil release rate,the plume length is very short so that the plume stage can be ignored due to the small initial *** the oil release in direction is the same as the current,the current will play a positive role in the plume motion and the plume will therefore extend a longer *** this case,the greater the current velocity is,the longer the plume extension length will *** when the oil release in direction is opposite to the current,the plume first moves forward and then is reversed to move along the opposite *** position of the reversal point depends on the current velocity and the release ***,the release rate and the current velocity also have a significant effect on oil droplet *** small oil release rate,the oil distribution area is narrow and the concentration near upper side of droplets moving path is relatively *** the release rate or current velocity increases,the oil droplet diffusion area expands away from the release ***,the movement characteristics of oil droplets in the plume and diffusion stages will affect the time and location for oil droplets reaching the *** a small release rate as well as a small current velocity,the time for oil droplet reaching surface is very short and the horizontal position reaching surface is closer to release *** this case,the time spent in the plume stage is extremely s

关键词： Submarine pipeline plume dynamics Dispersion characteristics Simulation

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Optimization for epitaxial fabrication of infinite-layer nickelate superconductors

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Frontiers of physics 2024年第3期19卷 61-69页

作者： Minghui Xu Yan Zhao Xiang Ding Huaqian Leng Shu Zhang Jie Gong Haiyan Xiao Xiaotao Zu Huiqian Luo Ke-Jin Zhou Bing Huang Liang Qiao School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Beijing Computational Science Research Center Beijing 100193China Diamond Light Source Harwell CampusDidcot OX110DEUnited Kingdom Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The discovery of nickelates superconductor creates exciting opportunities to unconventional superconductivity. However, its synthesis is challenging and only a few groups worldwide can obtain samples with zero-resistance. This problem becomes the major barrier for this field. From plume dynamics perspective, we found the synthesis of superconducting nickelates is a complex process and the challenge is twofold, i.e., how to stabilize an ideal infinite-layer structure Nd_(0.8)Sr_(0.2)NiO_(2), and then how to make Nd_(0.8)Sr_(0.2)NiO_(2) superconducting? The competition between perovskite Nd_(0.8)Sr_(0.2)NiO_(3) and Ruddlesden−Popper defect phase is crucial for obtaining infinite-layer structure. Due to inequivalent angular distributions of condensate during laser ablation, the laser energy density is critical to obtain phase-pure Nd_(0.8)Sr_(0.2)NiO_(3). However, for obtaining superconductivity, both laser energy density and substrate temperature are very important. We also demonstrate the superconducting Nd_(0.8)Sr_(0.2)NiO_(2) epitaxial film is very stable in ambient conditions up to 512 days. Our results provide important insights for fabrication of superconducting infinite-layer nickelates towards future device applications.

关键词： nickelate superconductivity infinite-layer plasma condensate plume dynamics

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East African topography and volcanism explained by a single,migrating plume

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Geoscience Frontiers 2020年第5期11卷 1669-1680页

作者： Rakib Hassan Simon E.Williams Michael Gurnis Dietmar Muller School of Geosciences Room 412Madsen Building F09 Eastern AvenueThe University of SydneyNSW2006Australia Seismological Laboratory California Institute of TechnologyPasadenaCA91125USA Now at Geoscience Australia GPO Box 378CanberraACT2601Australia State Key Laboratory of Continental dynamics Department of GeologyNorthwest UniversityXi’an 710069China

Anomalous topographic swells and Cenozoic volcanism in east Africa have been associated with mantle *** models involving one or more fixed plumes beneath the northeastward migrating African plate have been suggested to explain the space-time distribution of magmatism in east *** devise paleogeographically constrained global models of mantle convection and,based on the evolution of flow in the deepest lower mantle,show that the Afar plume migrated southward throughout its *** models suggest that the mobile Afar plume provides a dynamically consistent explanation for the spatial extent of the southward propagation of the east African rift system(EARS),which is difficult to explain by the northeastward migration of Africa over one or more fixed plumes alone,over the last≈45 *** further show that the age-progression of volcanism associated with the southward propagation of EARS is consistent with the apparent surface hotspot motion that results from southward motion of the modelled Afar plume beneath the northeastward migrating African *** models suggest that the Afar plume became weaker as it migrated southwards,consistent with trends observed in the geochemical record.

关键词： Numerical mantle flow models Deep mantle flow LLSVP morphology plume dynamics plume motion Dynamic topography

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