放射性核污染传播的研究

提出了一个核污染传播的分层模型,通过对核污染事件发生后,核污染物外围大颗粒的抛射与重力降落、放射云内小颗粒的沉降和放射云的膨胀扩散等传播方式的研究,给出了放射性核污染物传播的范围和污染程度,为核泄露事件发生后,核污染的防治提供了一种参考依据。     

EFFECT OF ATOMIC HYDROGEN ON THE ACETYLENE-ADSORBED Si(100)(2×1) SURFACE AT ROOM TEMPERATURE

High resolution electron energy loss spectroscopy, low energy electron diffraction and quadrupole maas spectrometer (QMS) have been employed to study the effect of atomic hydrogen on the acetylene-saturated pre-adsorbed Si(100)(2×1) surface and the surface phase transition at room temperature. It is evident that the atomic hydrogen has a strong effect on the adsorbed C₂H₂ and the underlying surface structure of Si. The experimental results show that CH and CH₂ radicals co-exist on the Si surface after the dosing of atomic hydrogen; meanwhile, the surface structure changes from Si(100)(2×1) to a dominant of (1×1). These results indicate that the atomic hydrogen can open C=C double bonds and change them into C-C single bonds, transfer the adsorbed C₂H₂ to C₂H_x(x = 3,4) and break the underlying Si-Si dimer, but it cannot break the C-C bond intensively. The QMS results show that some C₄ species axe formed during the dosing of atomic hydrogen. It may be the result of atomic hydrogen abstraction from C₂H_x which leads to carbon catenation between two adjacent C-C directs. The C₄ species formed are stable on Si(100) surfaces up to 1100 K, and can be regarded as the potential host of diamond nucleation.     

基于Lab VIEW的多功能电磁感应实验仪

在已有的基于LabVIEW定量探究法拉第电磁感应定律实验基础上,改进LabVIEW的数据处理程序以减小误差,并加入图像和线性拟合功能,使复杂的物理过程得以直观呈现,在此基础上由单件教具走向积件教具,通过教具的拆分、重组,实现教具的多维性.     

基于双暗环效应的折射率的测量装置

本实验装置利用全反射形成的双暗环效应, 分析得出两个圆形暗环直径之比与待测物体折射率的数 学解析关系. 以激光笔、 玻璃容器、 智能手机等为主要测量装置进行测量, 建立了测量液体折射率的新方法, 经实验 证明, 此方法操作简便可行、 精确度和稳定性高. 将此原理结合手机 A P P, 使折射率的测量更加简便快捷. 人们可用 此装置测量食用油的纯度或果汁等食品的可溶性固形体的含量, 由此为生产技术或社会生活带来便利     

EFFECT OF ATOMIC HYDROGEN ON THE ACETYLENE-ADSORBED Si(100)(2×1) SURFACE AT ROOM TEMPERATURE

High resolution electron energy loss spectroscopy, low energy electron diffraction and quadrupole maas spectrometer (QMS) have been employed to study the effect of atomic hydrogen on the acetylene-saturated pre-adsorbed Si(100)(2×1) surface and the surface phase transition at room temperature. It is evident that the atomic hydrogen has a strong effect on the adsorbed C₂H₂ and the underlying surface structure of Si. The experimental results show that CH and CH₂ radicals co-exist on the Si surface after the dosing of atomic hydrogen; meanwhile, the surface structure changes from Si(100)(2×1) to a dominant of (1×1). These results indicate that the atomic hydrogen can open C=C double bonds and change them into C-C single bonds, transfer the adsorbed C₂H₂ to C₂H_x(x = 3,4) and break the underlying Si-Si dimer, but it cannot break the C-C bond intensively. The QMS results show that some C₄ species axe formed during the dosing of atomic hydrogen. It may be the result of atomic hydrogen abstraction from C₂H_x which leads to carbon catenation between two adjacent C-C directs. The C₄ species formed are stable on Si(100) surfaces up to 1100 K, and can be regarded as the potential host of diamond nucleation.     

视频与数据联动系统在物理实验评价中的应用——以RLC串联电路实验为例

传统大学物理实验的考核与评价主要依靠书面考试和教师观察,评价效率低,忽视实验过程,难以全面客观的评价学生实验.本文设计了一种实验过程的视频与实验数据同步记录系统,介绍系统设计、系统实现并以RLC串联电路实验为例介绍系统的应用.实验视频和数据记录为实验评价提供全面、客观的评价依据,通过对实验数据的可视化呈现、数据分析、实验细节的视频和数据联动检索,提高实验评价效率和科学性.     

连续波核磁共振实验的新型功率源设计

连续波核磁共振实验是近代物理实验中具有代表性的一个实验．本文提出一种新型磁铁控制功率源设计,该功率源能够产生有直流偏置的交变电流,直流偏置大小与交变电流的大小和波形都可调节,驱动绕在永磁体上的一组线圈,改变主磁场大小和扫场的扫场模式．     

吉木萨尔县园林鼠类群落的研究

1995年5月～12月，在新疆吉木萨尔县林木良种试验站，对国林鼠类群落结构进行了调查研究．依不同的生境选15个样地．以铗夜法捕获的952只鼠作分类．经聚类分析，该地鼠类群落由根田鼠（5859％）、小家鼠（18．15％）、灰白鼠（18．46％）、小林姬鼠（3．52％）、红尾沙鼠（0．80％）、草原兔尾鼠（0．48％）组成，可划分为根田鼠＋灰白鼠群落和小家鼠＋灰白鼠群落两种．