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国家自然科学基金(10372044)

作品数:4 被引量:12H指数:2
相关作者:郭万林张助华郭宇锋李海军更多>>
相关机构:南京航空航天大学更多>>
发文基金:国家自然科学基金江苏省自然科学基金长江学者和创新团队发展计划更多>>
相关领域:理学一般工业技术更多>>

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THE COUPLED EFFECTS OF MECHANICAL DEFORMATION AND ELECTRONIC PROPERTIES IN CARBON NANOTUBES被引量:6
2004年
Coupled effects of mechanical and electronic behavior in single walled carbon nanotubes are investigated by using quantum mechanics and quantum molecular dynamics.It is found that external applied electric fields can cause charge polarization and significant geometric deformation in metallic and semi-metallic carbon nanotubes.The electric induced axial tension ratio can be up to 10% in the armchair tube and 8.5% in the zigzag tube.Pure external applied load has little effect on charge distribution,but indeed influences the energy gap.Tensile load leads to a narrower energy gap and compressive load increases the gap.When the CNT is tensioned under an external electric field,the effect of mechanical load on the electronic structures of the CNT becomes significant,and the applied electric field may reduce the critical mechanical tension load remarkably.Size effects are also discussed.
郭万林郭宇锋
Casimir力和静电力驱动下同轴圆柱管模型的GHz振动
2007年
提出了一种双层同轴圆柱管振动的力学模型,并用连续介质力学的方法分析了该模型分别在Casimir力和静电力驱动下的振动特性.计算结果表明,在理想情况下,如果模型管间距达到1纳米量级,Casimir力和静电力有可能驱动该模型达到GHz甚至更高量级频率的振动,这说明Casimir力和静电力驱动GHz的振动具有理论上的可行性.
李海军郭万林
关键词:CASIMIR力静电力纳机电系统
PLANE STRAIN PROBLEM OF PIEZOELECTRIC SOLID WITH ELLIPTIC INCLUSION
2005年
By using the complex variables function theory, a plane strain electro-elastic analysis was performed on a transversely isotropic piezoelectric material containing an elliptic elastic inclusion, which is subjected to a uniform stress field and a uniform electric displacement loads at infinity. Based on the present finite element results and some related theoretical solutions, an acceptable conjecture was found that the stress field is constant inside the elastic inclusion. The stress field solutions in the piezoelectric matrix and the elastic inclusion were obtained in the form of complex potentials based on the impermeable electric boundary conditions.
戴隆超郭万林佘崇民
关键词:PIEZOELECTRIC
轴向磁场对碳纳米管电子性质的影响被引量:6
2006年
用紧束缚法研究了单壁碳纳米管在轴向磁场下费米能级附近电子性质的变化规律.研究发现:能隙随轴向磁场变化的快慢及磁致能隙峰值都与碳纳米管直径有着紧密联系;对于相同直径的碳纳米管,金属性管的磁致能隙峰值最大.具体计算了锯齿型碳纳米管费米能级附近电子态密度随轴向磁场的变化关系,发现所有碳纳米管的电子态密度和能隙变化都体现出周期性.磁场使得碳纳米管发生绝缘体-金属周期性相转变的根本原因是由于在磁场的作用下范霍夫奇异点出现分裂-移动-融合的周期性变化.
张助华郭万林郭宇锋
关键词:磁场碳纳米管
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