精确测量电源电动势和内电阻

根据电势差计原理，设计一种测量电池电动势和内电阻的电路，从而降低了由电表内阻影内所带来的实验系统误差。     

用伏特计测电源电动势

提出一种测量电源电动势的方法，即用伏特计代替电位差计测量电源的电动势和内阻。     

用示波器测交变磁场及真空磁导率

采用示波器对感应法测交变磁场实验进行了改进,提高了实验的效果和精度.若已知磁场强度,还可测定真空磁导率.     

Anomalous thermal electromotive force in samarium monosulfide

The thermal emf in samarium monosulfide was investigated at temperatures between 300 and 530 K. At T=435–455 K, an anomalous increase in the emf was found. This effect is explained by a noncoherent change in the valency of samarium ions.     

The development of an electromotive force in a semiconductor placed in an inhomogeneous magnetic field

The possibility of development of an electromotive force (emf) in a semiconductor placed only in an inhomogeneous magnetic field is shown. The conditions and the experimental evidence of its appearance are presented.     

载流导体的磁场力及真空磁导率的巧测量

介绍了用电子分析天平测量平行载流导体间的磁场力和真空磁导率的原理和方法.     

Measuring the 9-component magnetic permeability tensor of ferrites

The magnetic permeability tensor of ferrite monocrystals can, in the general case, be represented as consisting of nine components [1]. In [2] the 6-component magnetic permeability tensor was obtained for a triaxial ferrite monocrystal with low magnetic anisotropy energy magnetized by a constant field in the crystallographic plane (110). In the general case of magnetization in an arbitrary crystallographic direction the tensor becomes a 9-component tensor [3]. In the context of the increasing application of ferrite monocrystals in microwave engineering the question of measuring such a tensor is of current scientific and practical interest. In the present article we propose a method for measuring the 9-component tensor for ferrite materials at microwave frequencies.     

On the thermal electromotive force of multivalley semiconductors

Thermal emf coefficient expression for nondegenerate multivalley semiconductors is obtained. It is shown that the expression for thermal emf coefficient can be presented by the parameters of one certain valley. A practically important case of two-valley semiconductor is considered.     

交变力磁力显微镜动态成像技术的研究

近年来磁力显微镜(magnetic force microscopy,MFM)对动态磁场信号的测量与分析由于其特殊的工业要求和重要用途而受到广泛关注,本文旨在利用交变磁力对磁性探针的周期性调制发展一种交变力磁力显微镜技术,为磁信息存储工业等重要领域关键技术的发展提供新型的有力的工具.与目前标准MFM采用的设计思路不同,本文的关键在于合理利用MFM频率调制机理,优化设计MFM磁性探针,并且引入动态信号处理模块,实现对交变磁场信号的MFM成像.为达到这些目的,需要从理论上研究MFM探针的频率调制机理,并由实验上设计出动态信号提取模块,二者相辅结合优化设计出具有动态信号测试和分析能力的交变力磁力显微镜技术,由此来测量和解释纳米尺度磁畴结构.     

Specific features of the thermal electromotive force in Bi quantum wires in transverse magnetic and electric fields

The thermal electromotive force (emf) in Bi quantum wires has been calculated in the model of potential in the form of a paraboloid of revolution in a uniform magnetic field H, which is normal to the axis of the studied nanostructure, and in a direct-current (dc) electric field E ‖ H. It has been shown that, with an increase in E, the thermal emf α _xx is described by a nonmonotonic function at different values of H. A physical interpretation of this behavior of α _xx as a function of E is proposed with account for the interaction between carriers and the rough surface of the nanowire.