受周期外界环境影响的VanderPol情绪模型

本文以VanderPol方程为基础,建立了受周期外界环境刺激影响的非线性动态情绪模型,并在Matlab环境下实现了具有混沌性质的数值模拟,所建立的模型很好地模拟了情绪变化的规律,并为计算机实现智能化打下了基础。     

The Rehm-Weller experiment in view of distant electron transfer

The driving‐force dependence of bimolecular fluorescence quenching by electron transfer in solution, the Rehm–Weller experiment, is revisited. One of the three long‐standing unsolved questions about the features of this experiment is carefully analysed here, that is, is there a diffusional plateau? New experimental quenching rates are compiled for a single electron donor, 2,5‐bis(dimethylamino)‐1,3‐benzenedicarbonitrile, and eighteen electron acceptors in acetonitrile. The data are analysed in the framework of differential encounter theory by using an extended version of the Marcus theory to model the intrinsic electron‐transfer step. Only by including the hydrodynamic effect and the solvent structure can the experimental findings be well modelled. The diffusional control region, the “plateau”, reveals the inherent distance dependence of the reaction, which is shown to be a general feature of electron transfer in solution.     

_(18)Ar~(q~ )(q=3,4)与H和He碰撞的电荷剥离截面

采用二体碰撞近似和托马斯 -费米近似计算了多电荷离子18Arq ( q =3,4 )与中性原子H和He碰撞的电荷剥离截面以及Arq 的势函数和电子动量分布 ,计算结果与文献 [4]中的数据符合得较好。所导出的计算公式和编制的计算程序可以计算任何一个多电荷离子Aq 与H或He碰撞的电荷剥离截面。因而具有一定的普适性。     

Vacancy encounter model for stochastically fluctuating electric field gradients in the Cu3Au crystal structure

A class of experimental techniques known as hyperfine methods can be used to measure electric field gradients (EFGs) through the hyperfine interaction experienced by tracer nuclei. When EFGs fluctuate at rates comparable to the inverse characteristic timescale of the hyperfine method, there is a loss of signal coherence that can be used to determine EFG fluctuation rates. This has been used to measure, for example, EFG fluctuations accompanying atomic jumps of radiotracers using perturbed angular correlation spectroscopy (PAC). Nominally, there is a one-to-one correspondence between EFG fluctuation and tracer jump, but when tracer jumps are mediated by a vacancy diffusion mechanism, a subset of multiple tracer-vacancy exchanges will not affect spectra when they occur much faster than the hyperfine timescale, leading to an underestimate of underlying tracer jump rate if this correlated random-walk effect is not taken into consideration. The present work calculates the factor by which EFG fluctuation rate differs from tracer jump rate based on a time-dependent, random-walk analysis of tracer displacement probabilities in a vacancy encounter model for the special case of self-diffusion in the L1₂ crystal structure.     

Electron impact ionization of Ba,Ba+ and Ba2+

The binary encounter approximation has been used to investigate the effect of charge state of the target atom (ion) on the electron impact excitation autoionization cross-sections. Roothan-Hartree-Fock (RHF) velocity distribution for the bound electrons has been used through-out the calculations. The present results give a good account of the experimental observations.     

基于遭遇波的艏前波法的航母姿态预报

航母在海洋航行时,为了使舰载机起飞和降落更安全,需要对航母姿态运动进行预报。艏前波法仅反映海浪本身的波动,没有考虑航母与海浪相互作用的情况。基于遭遇波的艏前波法,用航母遭遇海浪的观测序列替代海浪观测值作为ARMA模型的系统干扰,使得预报精度更准确。通过仿真分析,基于遭遇波的艏前波法结果与艏前波法结果对比,四级海况下,横摇运动预报4 s的误差不超过0.03°,预报8 s的误差不超过0.15°,纵摇运动预报4 s的误差不超过0.05°,预报8 s的误差不超过0.06°,结果表明了该方法的有效性。     

交叉会遇转向避让DCPA决策模拟模型

本文运用模糊数学的理论,提出交叉会遇中转向避让DCPA决策的模拟模型。     

近玻尔速度氙离子激发钒的K壳层X射线

测量了2.4—6.0 MeV Xe~(20+)离子轰击V靶表面过程中辐射的X射线.计算了V的K壳层X射线发射截面,并将实验结果与平面波恩近似、ECPSSR、两体碰撞近似的理论计算进行了对比.讨论了近玻尔速度非对称碰撞过程中,BEA模型估算高电荷态重离子激发内壳层电离的修正因素.结果表明,综合考虑库仑偏转和有效电荷态修正后,BEA理论与实验结果符合较好.