弗兰克-赫兹实验中吸收峰形成与变化判断准则的研究

以汞原子第一激发电势为例,系统地研究了吸收峰的形成条件,进而导出了吸收峰形成与变化的判断准则,并利用这一准则成功地解释了吸收曲线常成橄榄形的原因。     

井筒套管对井间电磁成像测井信号传输的影响

通过模拟柱状三层介质中电磁波传播特性,得到了井筒套管对井间传输的电磁信号的影响。将发射天线看作位于无限长圆柱形井筒套管中央的垂直磁偶极子,井筒套管内外是分布均匀的柱状三层介质,把电磁场用磁赫兹矢量位表示,推导了各个区域的电磁场积分表达式,利用数值积分计算了不同情况下的电磁场分布,分析了井筒套管电导率(材料)、厚度及测井工作频率对井间电磁成像测井信号的影响。     

膛内运动弹丸微多普勒建模与仿真

针对太赫兹波段弹丸膛内轴向运动同时存在横向摆动产生的微多普勒现象不容忽略的情况,文中采用刚体运动学和传统多普勒分析相结合的方法,推导了其微多普勒数学公式和回波信号模型.通过仿真验证了理论推导的正确性,同时表明弹丸平动加速度会使微多普勒沿时变频率方向发生倾斜,其附加频率调制作用使提取的弹丸速度产生波动,为进一步研究微多普勒提取技术提供了理论基础.     

A new method for the calculation of Sommerfeld screening parameter σ1 in x-ray spectra

The paper describes a new method for the calculation of the Sommerfeld screening parameter σ₁. It requires neither the knowledge of the energy separations of spin doublet levels nor is it based on the application of the Hertz law. The only data required for the calculation are the experimental energy values of the level concerned for the series of elements belonging to the same subshell in which the element in the question is situated. As an illustration the values of σ₁ are calculated for the L ₁, L ₂ and L ₃ levels for elements belonging to the 4f subshell and these are found to be in excellent agreement with those published earlier by Gokhale and Misra. The method brings out the constancy of σ₁ (L ₂ L ₃)−σ₁(L ₁) in a natural way and may thus be regarded as providing theoretical explanation of the Hertz law.     

赫兹对阴极射线的实验研究及其重要影响

根据赫兹的日记、书信、文集及相关文献,对赫兹所进行的阴极射线的实验研究工作进行了仔细考察,指出他对阴极射线的一系列实验研究为揭示阴极射线的全部特性奠定了重要基础,对勒纳德和汤姆孙在这一领域的研究产生了直接影响．     

Focal distributions and Hertz potentials

The three-dimensional (3D) pupil function for a high-aperture focusing system can be expressed in terms of Hertz or Debye potentials. The electromagnetic field in the focal region can be calculated directly from these. The Debye potential pupil function is given for optical systems obeying different conditions.     

Annular Ring Microstrip Antennas for Millimeter Wave Applications

This work presents a fullwave analysis for annular ring microstrip antennas on uniaxial anisotropic substrates. The effect of the anisotropic substrates on the antenna performance at the millimeter wave band is investigated. The analysis is performed in the Hankel transform domain using Hertz vector potentials and Galerkin Method. Numerical results are presented for the antenna main characteristics such as resonant frequency and radiation pattern.     

Carl Neumann’s Contributions to Electrodynamics

I examine the publications of Carl Neumann (1832–1925) on electrodynamics, which constitute a major part of his work and which illuminate his approach to mathematical physics. I show how Neumann contributed to physics at an important stage in its development and how his work led to a polemic with Hermann Helmholtz (1821–1894). Neumann advanced and extended the ideas of the Königsberg school of mathematical physics. His investigations were aimed at founding a mathematically exact physical theory of electrodynamics, following the approach of Carl G.J. Jacobi (1804–1851) on the foundation of a physical theory as outlined in Jacobis lectures on analytical mechanics. Neumanns work also shows how he clung to principles that impeded him in appreciating and developing new ideas such as those on field theory that were proposed by Michael Faraday (1791–1867) and James Clerk Maxwell (1831–1879).Karl-Heinz Schlote works as a historian of mathematics in the Arbeitsgruppe für Geschichte der Naturwissenschaften und Mathematik at the Sächsische Akademie der Wissenschaften in Leipzig, Germany.     

弗兰克—赫兹实验中的峰间距问题

运用吸收峰形成与变化判断准则解释了管温和阴－栅极距离对峰间距的影响。