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In this paper, we investigate a chemostat model with delay and periodically pulsed input nutrient. We obtain the sufficient condition for global attractivity of the microorganism-extinction periodic solutions and the permanence of the system. And, we also prove that all solutions of system are ultimately uniformly bounded.
Tinnitus is defined as "unwanted auditory perception of internal origin, usually localized, and rarely heard by others. Tinnitus is a sensibly experienced ringing sensation in the auditory system, which occurs without the presence of an actual auditory stimulation". Nowadays many researchers focused on finding a method for treatment of tinnitus. Although they report many different treatments,...
The lack of knowledge about water flow and particle behavior of the grit chamber with rotational flow remains a significant difficulty for the design of these work in sandstone wastewater of hydropower station. In the paper, Eulerian-Lagrangian multi-phase model is set up. The grit chamber with rotational flow in the powerhouse, which is located in southwest of China, is as a case. Velocity field...
Based on the Navier-Stokes equations for viscous, incompressible fluid and VOF method, the numerical experiment platform of oil containment by rigid floating boom in wave is established, utilizing the commercial CFD software FLUENT, and the waves are generated by defining the velocity of water particle on the inlet boundary. The volume of fluid (VOF) model is used to distinguish the three immiscible...
The recovery of Dimethylbenzene and Butylacetate from industry spent solvent oil by batch distillation was studied, and the batch distillation experiment was performed with pretreated material. The effect of separation temperature, time and reflux ratio on separation process was investigated. The experimental results showed that the concentrations of Dimethylbenzene and Butylacetate were above 95%...
A two-fluid model was adopted to simulate the three-dimensional gas-liquid flow in an aeration tank. The different operation parameters of aeration tank were simulated with the model, and the gas-liquid flow behavior in aeration tank was analyzed. The simulation results agree qualitatively with the operating conditions in literature and actual plant. Application of the model was demonstrated by analyzing...
A discrete tuberculosis model with different infectious compartments is formulated and studied. The basic reproduction number, Rο of the model is defined. The global stability of the disease-free equilibrium is proved if R0 <; 1 . The existence of endemic equilibrium and the persistence of TB is established if R0 > 1 . The main attention is paid on the influence of the infectivity proportion...
Water shortage resulted in seawater intrusion of coastal area, especially on the coast cities. The paper reviewed the history of seawater intrusion models, and analyzed status on the seawater intrusion in Chinese coastal cities; concluded the characteristics, reasons and rules of the seawater intrusion. According to the present situation about seawater intrusion in China, it proposed major issues...
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