Jordan has a good natural potential for solar energy source. To reach at economic practicability of solar energy sources, Jordan needs to accelerate the development of the national photovoltaic projects. The economic ...Jordan has a good natural potential for solar energy source. To reach at economic practicability of solar energy sources, Jordan needs to accelerate the development of the national photovoltaic projects. The economic and financial analysis of the 75 MW Photovoltaic Project for Jordan is presented in this paper. Comparing analysis considers, seven different scenarios regarding the type of the modules and of the mounting system as well as three different cases to further evaluate the effects of land requirements based on an equivalent installed capacity. Based on the analyzed scenarios, it was found that the project will serve as a ＂fuel saver＂, as the energy generated at the Jordan Photovoltaic Project replaces energy generated at the thermal plant with the highest variable costs in the grid. This replacement has it, which avoids the CO2 emissions associated with thermal generation, as the further advantage.展开更多
An unsteady model of melting heat transfer in metal foam filled with paraffin is developed and numerically analyzed. In the model, the pore distribution of metal foam is described by Sierpinski fractal. By this fracta...An unsteady model of melting heat transfer in metal foam filled with paraffin is developed and numerically analyzed. In the model, the pore distribution of metal foam is described by Sierpinski fractal. By this fractal description,six types of metal foams with the identical porosity, different pore distributions are reconstructed. The effect of pores distribution on the heat transfer performance of the paraffin/copper foam composite is emphatically investigated. The solid-liquid distribution, the evolution of the melting front, the dynamic temperature response and the total melting time in these six fractal structures are all examined and analyzed. The results indicate that, the pores distribution has a significant impact on the melting heat transfer of the paraffin in the metal foam. When the first-level fractal pore is located near the heat source boundary, the thermal hysteresis effect of the paraffin on the solid matrix heat transfer is more significant. If the cross-sectional length of the pores along the normal direction of heat transfer is larger, the heat transfer barrier of the solid matrix is greater. It is favorable for the paraffin heat transfer when the pores specific surface area is larger.展开更多
This paper investigates the statistical behaviors of fluctuations of price changes in a stock market.The Sierpinski carpet lattice fractal and the percolation system are applied to develop a new random stock price for...This paper investigates the statistical behaviors of fluctuations of price changes in a stock market.The Sierpinski carpet lattice fractal and the percolation system are applied to develop a new random stock price for the financial market.The Sierpinski carpet is an infinitely ramified fractal and the percolation theory is usually used to describe the behavior of connected clusters in a random graph.The authors investigate and analyze the statistical behaviors of returns of the price model by some analysis methods,including multifractal analysis,autocorrelation analysis,scaled return interval analysis.Moreover,the authors consider the daily returns of Shanghai Stock Exchange Composite Index,and the comparisons of return behaviors between the actual data and the simulation data are exhibited.展开更多
文摘Jordan has a good natural potential for solar energy source. To reach at economic practicability of solar energy sources, Jordan needs to accelerate the development of the national photovoltaic projects. The economic and financial analysis of the 75 MW Photovoltaic Project for Jordan is presented in this paper. Comparing analysis considers, seven different scenarios regarding the type of the modules and of the mounting system as well as three different cases to further evaluate the effects of land requirements based on an equivalent installed capacity. Based on the analyzed scenarios, it was found that the project will serve as a ＂fuel saver＂, as the energy generated at the Jordan Photovoltaic Project replaces energy generated at the thermal plant with the highest variable costs in the grid. This replacement has it, which avoids the CO2 emissions associated with thermal generation, as the further advantage.
基金Supported by the National Natural Science Foundation of China under Grant No.51706101Key Laboratory of Solar Energy Science and Technology Foundation of Jiangsu Province under Grant No.KLSST201704the Fundamental Research Funds for the Central Universities under Grant No.30917011328
文摘An unsteady model of melting heat transfer in metal foam filled with paraffin is developed and numerically analyzed. In the model, the pore distribution of metal foam is described by Sierpinski fractal. By this fractal description,six types of metal foams with the identical porosity, different pore distributions are reconstructed. The effect of pores distribution on the heat transfer performance of the paraffin/copper foam composite is emphatically investigated. The solid-liquid distribution, the evolution of the melting front, the dynamic temperature response and the total melting time in these six fractal structures are all examined and analyzed. The results indicate that, the pores distribution has a significant impact on the melting heat transfer of the paraffin in the metal foam. When the first-level fractal pore is located near the heat source boundary, the thermal hysteresis effect of the paraffin on the solid matrix heat transfer is more significant. If the cross-sectional length of the pores along the normal direction of heat transfer is larger, the heat transfer barrier of the solid matrix is greater. It is favorable for the paraffin heat transfer when the pores specific surface area is larger.
基金supported by the National Natural Science Foundation of China Grant Nos.71271026 and 10971010
文摘This paper investigates the statistical behaviors of fluctuations of price changes in a stock market.The Sierpinski carpet lattice fractal and the percolation system are applied to develop a new random stock price for the financial market.The Sierpinski carpet is an infinitely ramified fractal and the percolation theory is usually used to describe the behavior of connected clusters in a random graph.The authors investigate and analyze the statistical behaviors of returns of the price model by some analysis methods,including multifractal analysis,autocorrelation analysis,scaled return interval analysis.Moreover,the authors consider the daily returns of Shanghai Stock Exchange Composite Index,and the comparisons of return behaviors between the actual data and the simulation data are exhibited.
