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Research on cardiopulmonary resuscitation (CPR) has always been important and thus focused on by the medical community. The hemodynamic effects of CPR have a direct impact on the survival rate of and prognosis for patients. Research shows that performing Enhanced External Counter-Pulsation (EECP) on lower limbs during the recoil phase of chest compression improves hemodynamic effects. AEI-CPR is an...
To minimize the damage resulting from oil spill accidents, it is necessary to respond quickly with an appropriate strategy. Accurately forecasting the behavior of the spilled oil is crucial for a successful recovery operation and protection of marine resources. Therefore, the numerical modeling and simulation of the spilled oil at sea plays an important role in the oil spill response and contingency...
Marine water quality model is complicated because of its multi-parameter and multi-response characteristic. In this paper, a new method based on data-driven model (DDM) is developed to retrieve the value of model parameters for model calibration. All training data are calculated by numerical water quality model from results of multi-parameter matching design cases. The basic idea is to find out the...
The total hardness in aquifer often increased rapidly in urban area, and it may caused by the hydrogeochemistry. However it is not clear where the hydrogeochemistry happened in aquifer or in vadose zone. In this paper, mineral dissolution and cation exchange relevant to total hardness were simulated by the hydrogeochemical transport model in order to research the influences of the mineral dissolution...
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.
One example of grid reconstruction and blood flow simulation for a patient with internal carotid artery aneurysms was presented. The method accurately duplicates the geometry to provide computer simulations of the blood flow. Initial images were obtained by using CT angiography in DICOM format. The image was processed by using MIMICS software, and the 3D fluid model (blood flow) and 3D solid model...
A discrete mathematical model with time delays for the transmission of malaria is established. The basic reproductive number R0 of the model is defined. Numerical simulations are given to show that the disease free equilibrium is stable when R0<;1 and the unique positive equilibrium is locally asymptotically stable when R0 > 1. The elasticity of the basic reproductive number with respect to...
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...
During the past decades, construction and demolition (C&D) waste has received increasing attention from construction practitioners and researchers around the world. A plethora of research has been published in various academic journals. These studies have investigated a wide range of topics under the umbrella of C&D waste management, of which investigation into the generation of C&D waste...
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 outlet air velocity of air curtain is one of the key factors which have effect on its dust-isolating efficiency. In this paper, the effect of the outlet air velocity of air curtain on dust isolation had been numerically investigated by using a CFD software, Fluent. A prototype of dust-isolating air curtain have been successfully applied in a full-mechanized working face of Gequan coal mine, Hebei...
A three-dimensional heterogeneous macrocosmic mass transfer model was proposed. The effect of some parameters such as solid adsorptive capacity and diameter distribution on gas absorption was studied in detail. From the results, the adsorption capacity of particles played an important role in gas absorption. With an increase of particle capacity, the adsorption driving force increases greatly, resulting...
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%...
In this paper, a predator-prey system is proposed which changes the roles of predator and prey when the prey becomes adult. Through investigating, sufficient conditions have been obtained for boundedness of solutions and permanence of the proposed model. By using bifurcation theory, Hopf bifurcation occurs as the time delay increases through a critical value. At last, numerical simulations are carried...
The bio-hydrogen producing process has complex interactions; thus, constructing a detailed mechanistic model and proper control architecture is difficult. Artificial neural networks (ANNs) are capable of inferring the complex relationships between input and output process variables without a detailed characterization of the mechanisms governing the process. This work presented a novel ANN that accurately...
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...
Highway green landscape is an important part of the highway systems. Now freeway and multi-lane highway green landscape have been concerned, but two-lane highway green landscape has not been researched. Through analyzing the function of greening, this paper summarizes a research project that was to develop evaluation models for green landscape evaluation. The main evaluation indices considered are...
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...
Based on the hydrology and sediment data, an artificial neural network model which has been applied maturely and widely in all kinds of artificial neural network is established to study the relationship of channel cubage under 0m isobath in North Branch with the flow and sediment discharge at Datong gauging station, and the flow split ratio of the North Branch. The structure of the network model is...
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