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Marine ecosystems are complex nonlinear systems, and there biological variables have low-dimensional nonlinear chaos characteristics. Under certain conditions, marine planktonic ecosystem can have different nonlinear dynamic properties, such as point attractor, periodic attractor as well as chaotic attractor. In this paper, a phytoplankton-fish (herbivorous) model was constructed. With the fishing...
A new numerical method is developed for finding response samples for a Verhulst-type system subjected to Poisson white noise. The method based on the three following steps: first, zero-one jump law was used to generate the sample paths of Poisson white noise, which worked as the system inputs, then the classical Heun method was used to calculate the system outputs corresponding to the generated input...
In China, more and more building safety problems and disputes about the quality of buildings have occurred. It's important to enhance the management of the building design enterprises. Connecting "Bad Record" to the level of building design enterprises, we construct the management system of survey and design market and a new dynamic management mode, and stochastic frontier analysis (SFA)...
Price system was analyzed by a nonlinear stochastic dynamic model with the supply and demand factors. This model converged to a process in probability. Then the stability of the system was analyzed by the result of drift coefficient and diffusion coefficient of the process. Numerical simulation results of the stationary probability density with different conditions were shown. It can be concluded...
A nonlinear dynamic price model considering the nonlinear factors between supply and demand was constructed in this paper. And the meanings of each parameters in the model were explained. By using nonlinear dynamic analysis, the system stability conditions were obtained from the analysis of the model. By numerical simulation of the model with MATLAB, the influence of different parameters on the system...
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