Oceanic geostrophic turbulence is mostly forced at the surface, yet strong bottom-trapped flows are commonly observed along topographic anomalies. Here we consider the case of a freely evolving, initially surface-intensified velocity field above a topographic bump, and show that the self-organization into a bottom-trapped current can result from its turbulent dynamics. Using equilibrium statist...

This article investigates the modeling of mixing phenomena occur at unsteady stirring conditions in that agitated vessels. In particular, a new model of a torus reactor including a well-mixed zone and a transport zone is proposed The originality of the arrangement of ideal reactors developed here is due to the time-dependent location of the boundaries between the two zones. This concept is appl...

The pond bottom soil and the accumulated sediments are integral parts of ponds. Concentrations of nutrients, organic matter and microorganism density in the pond bottom are several orders of magnitude greater than in the water. The accumulation of organic sediments may limit pond intensification. The intensive organic matter degradation at the pond bottom and high sediment oxygen demand exceeds...

1. Over 3,000 measurements of surface tension of sera have been made with the ring method, and they have yielded a new phenomenon, the spontaneous and rapid decrease of the surface tension of a serum in function of the time. 2. Generally, after 10 minutes the surface tension reaches a value which is practically constant. At least, the decrease is very much slower. After stirring, a rise occurs ...

Monitoring changes in populations of immature (larvae and pupae) mosquitoes are fundamental to determining mosquito-borne disease risk. Dipping is the most common method used to sample immature mosquitoes, but it can be biased towards particular species and instars. We aimed to assess the generality of the findings of Mori (1989), who showed that stirring the water of artificial containers gave...

For this article, the bottom regiments distribution is designed to investigate instantaneous kinetic energy of molten pool with help numerical simulation. The results indicate that time required for reach stable state affected by angle among regiments. When blowing gas flowrate 720 Nm3·h−1, shorter equilibrium 66 s 15°. Meanwhile, higher 2915 J has been discovered as outer kept at a pitch circl...

Electric arc furnace (EAF) steel bottom-blowing can effectively improve the temperature and composition uniformity of molten pool during smelting process. To explore effect molten-steel characteristics on at various stages smelting, we divided process EAF into four stages: melting stage, early decarburization intermediate ending stage. The numerical simulation software ANSYS Fluent 18.2 was use...