幼儿入园分离焦虑是教师和家长普遍关注的现实问题,主要表现可分为哭闹型、粘人型、恋物型和生理失控型。根据幼儿的年龄特征来分......

利用量子化学方法研究了甲苯的光电离解离过程．在B3LYP／6—311＋＋G（d，p）算法下得到了甲苯光电离过程中涉及的反应物、过渡态和产物的构型和......

Computations were performed for calculating cross sections of electron impact scattering from astro-physical targets CaF......