碳纳米管的本征微波吸收特性研究

从碳纳米管电磁参数和微波吸收特性的实验结果出发,分析探讨了碳纳米管的本征微波吸收机理,并得出结论:界面极化吸收、多重反射和散射以及螺旋型碳纳米管的手性微波吸收是碳纳米管的主要本征微波吸收机理.碳纳米管的结构缺陷能增强极化效应,从而增加介电损耗;碳纳米管所具有的小尺寸效应、表面效应(比表面积大)、量子尺寸效应和宏观量子隧道效应等有利于其微波吸收.碳纳米管的电容率值远大于磁导率值,碳纳米管是一种介电损耗型吸波介质.     

铁磁性金属填充碳纳米管的微波吸收机理研究

深入探讨了铁磁性金属填充碳纳米管的微波吸收机理,对铁纳米粒子填充碳纳米管的微波吸收特性进行了数值模拟,计算了其自然共振频率,模拟结果与实验数据相吻合理论上证明了铁磁性金属填充碳纳米管对微波的强烈吸收主要是样品中铁磁性金属纳米粒子在微波作用下产生了磁共振的结果研究发现,随着铁磁性金属填充碳纳米管薄膜厚度的增加,其共振频率...     

碳纳米管低温氢等离子体的微波吸收特性研究

运用双流体理论,在同时考虑了碳纳米管中低温氢等离子体的电子碰撞吸收和氢离子碰撞吸收的基础上,理论导出了铁催化高压歧化生成的碳纳米管中低温氢等离子体的微波吸收系数公式,数值计算了不同条件下的微波吸收系数.模拟结果表明,铁催化高压歧化生成的碳纳米管中低温氢等离子体对2.45GHz的微波产生强烈吸收.理论结果与实验数据相吻合.     

逐差法处理实验数据的研究

本文介绍了逐差法处理物理实验数据的基本方法和适用范围,表明了逐差法处理实验数据的优点.     

The effects of a static magnetic field on the microwave absorption of hydrogen plasma in carbon nanotubes： a numerical study

We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton-Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction on the microwave absorption of hydrogen plasma in CNTs are studied in detail. The numerical results indicate that the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes can be obviously improved when the exter- nal static magnetic field is applied to the material. It is found that the specified frequency microwave can be strongly absorbed by the hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes over a wide range of incidence angles by adjusting the external magnetic field intensity and the parameters of the hydrogen plasma.     

网络环境下参考咨询工作的新特点及其对策

Internent时代图书馆的服务方式和服务内容都发生了深刻的变化。比较了图书馆传统的参考咨询工作和网络环境下的参考咨询工作的不同特点，提出了一些促进二者相互融合，顺利转变并有利于图书馆网络化发展的对策。     

The effects of static magnetic field on microwave absorption of hydrogen plasma in carbon nanotubes: A numerical study

We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed highpressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton–Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction on the microwave absorption of hydrogen plasma in CNTs are studied in detail. The numerical results indicate that the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes can be obviously improved when the external static magnetic field is applied to the material. It is found that the specified frequency microwave can be strongly absorbed by the hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes over a wide range of incidence angles by adjusting the external magnetic field intensity and the parameters of the hydrogen plasma.