海南人口增长模型的统计分析

介绍了求非线性回归模型参数的基本理论,并且以海南人口增长数据为例,对比_分析了利用Malthus模型和Logistic回归模型的模拟结果.利用Mathematica软件绘制了海南人口增长数据的点图.最后给出海南人口增长数据的拟合曲线和置信域的图形.     

Impact of Sheath Boundary Conditions and Magnetic Flutter on Evolution and Distribution of Transient Particle and Heat Fluxes in the Edge-Localized Mode Burst by Experimental Advanced Superconducting Tokamak Simulation

To study the evolution and distribution of the transient particle and heat fluxes during the edge-localized modes(ELMs) burst on the experimental advanced superconducting tokamak(EAST), the BOUT++six-field two-fluid model with sheath boundary conditions(SBCs) and magnetic flutter terms in the parallel thermal conduction is used to simulate the evolution of the profiles and growing process of the fluxes at divertor targets. Although SBCs hardly play a role in the linear phase, in the nonlinear phase both SBCs and magnetic flutter can change the dominant toroidal mode. SBCs are able to broaden the frequency distribution of the turbulence. The magnetic flutter increases the ELM size from 2.8% to 8.4%, and it doubles the amplitudes of the radial heat and particle transport coefficients at outer midplane(OMP), at around 1.0 m~2 s~(-1). It is then able to increase the particle and heat flux at the divertor targets and to broaden the radial distribution of the parallel heat flux towards the targets.     

石油化学粗粒化分子力学/分子动力学力场：Ⅰ.烷烃的粗粒化模型

提供了一种用以描述石油中烷烃分子的通用型粗粒化模型.依据石油中烷烃的结构特征,划分出从A1到A7共7种粗粒化珠子.7种烷烃的粗粒化珠子含有3～6个碳原子,与之相对应的既有直链烷烃,也有支链烷烃.这些基本结构单元以不同的组合方式可以得到石油中从C3～C40各种烷烃的粗粒化分子.为了获得精确的力场参数,采用密度泛函方法优化...     

中国人口增长的脉冲突变与趋势预测

利用中国统计年鉴中1949-2016年有关中国人口的数据,研究了全面二孩政策对中国人口产生的一个脉冲突变,建立了具有脉冲的Richards人口增长模型,并且利用数值模拟方法研究2016年中国人口增长的脉冲突变,并且预测了中国人口的发展趋势和中国人口的峰值.