Structure of Lennard–Jones nanowires encapsulated by carbon nanotubes

Molecular dynamics simulations have been performed to investigate the structures of Lennard–Jones(LJ) nanowires(NWs) encapsulated in carbon nanotubes(CNTs). We find that the structures of NWs in a small CNT only adopt multi-shell motifs, while the structures of NWs in a larger CNT tend to adopt various motifs. Among these structures, three of them have not been reported previously. The phase boundaries among these structures are obtained regarding filling fractions, as well as the interaction between NWs and CNTs.     

中英中学物理实验考题支架构建特点的分析与启示

以电学实验题为例,对苏州中考和江苏高考,以及英国剑桥委员会设立的IGCSE、AS、A Level这5类考试中考查支架的搭建特点进行了对比分析.以苏州中考及江苏高考为例的国内考试中的实验题支架,旨在培养学生控制变量、注意实验安全,以及进行误差分析;英国IGCSE及AS考试中的实验题支架,目的在于为考生给出明确的操作指示,培养其实验操作能力.此外,与我国高考实验题的支架设置不同,基于IGCSE及AS阶段的基础学习,A Level考试的实验题完全拆除了支架,不再给学生提供解题思路与步骤,考查学生独立设计实验的能力.这种进阶式实验题支架搭建及拆除的模式,能为学生的实验能力培养提供有效帮助.     

Structure of Lennard-Jones nanowires encapsulated by carbon nanotubesStructure of Lennard-Jones nanowires encapsulated by carbon nanotubesStructure of Lennard-Jones nanowires encapsulated by carbon nanotubesStructure of Lennard-Jones nanowires encapsulated by carbon nanotubesStructure of Lennard-Jones nanowires encapsulated by carbon nanotubes

Molecular dynamics simulations have been performed to investigate the structures of Lennard-Jones （LJ） nanowires （NWs） encapsulated in carbon nanotubes （CNTs）. We find that the structures of NWs in a small CNT only adopt multi-shell motifs, while the structures of NWs in a larger CNT tend to adopt various motifs. Among these structures, three of them have not been reported previously. The phase boundaries among these structures are obtained regarding filling fractions, as well as the interaction between NWs and CNTs.     

英国奥林匹克物理竞赛实验操作试题特色分析

实验是中学物理教学的重要组成部分,而实验操作能力则是物理实验能力的核心内容.以IGCSE考试物理课程标准为依据,分析英国物理奥林匹克竞赛实验操作项目,发现试题具有实验内容与知识背景依赖程度低、实验背景引入内容丰富多样、学生安全意识导向明确、实验报告要求具体充实、重视科学态度要求5个方面的特色.据此提出对我国实验操作试题的命题启示.