A missing link: What is behind de Broglie's “periodic phenomenon”?

The present work constitutes an attempt to give the interpretation of de Broglie's internal periodic phenomenon which ascribes the frequencym ₀ c ²/h to each single entity in its eigensystem of coordinates. This phenomenon provides existence in principle of the ideal proper-time scale, making it possible to identify the geometric proper-time interval with a physically existing one, thus ensuring the realization of basic postulates of the relativity theory. According to the latter, neither time nor de Broglie's frequency are invariant with respect to the Lorentz transformation of the coordinate system. A search for the fundamental invariant demands passing over to dimensionless quantities, and we suggest to consider as such the integer numbers. Then it is the entity's periodic phenomenon which, after multiplying by the lasting proper-time, results in the open ordered sequence of natural numbers. The progressing course of numbers is ensured by the time course, whilst their ordering is connected with coherence. Such a sequence of numbers, once appeared in time, has to be conserved in space-time, demanding the periodic phenomenon's phase to be invariant with respect to the Lorentz transformation. This, in its turn, yields de Broglie's waves of matter, which are at the bottom of quantum physics. Thus, the most intrinsic feature of a fundamental entity has to be identified with its internal frequency, in order to ensure the actual existence of the sequence of natural numbers as the basic object of arithmetic.     

Detection of edges from spectral data: New results

We are concerned with the problem of recovering edges of piecewise smooth functions with finitely many jump discontinuities. In a series of papers, Gelb and Tadmor presented computationally simple methods for this task that are based on the conjugate Fourier series with different concentration kernels. In this article we present experimental results comparing conjugate series based methods with a new approach based on polynomial filters and suitable approximations. This new approach proves to be more accurate and stable.     

自由电子激光对芳香聚酰胺纤维热处理的研究

用红外自由电子激光方法处理芳香聚酰胺纤维.  实验结果表明, 芳香聚酰胺纤维在自由电子激光辐照时在外力拉伸下可出现“缩颈”现象. 红外光谱研究结果表明, 经自由电子激光处理的芳香聚酰胺纤维样品未出现热裂解. 这种方法有可能发展成一种热处理芳香聚酰胺纤维的新方法.     

Lee-Yang zeros and stokes phenomenon in a model with a wetting transition

We consider the statistical mechanics of a fluctuating string (1D solid-on-solid model) ofN columns with a contact energy term displaying a critical wetting transition. For this model we derive a contour integral representation for the finite-size partition function. From this representation we derive a polynomial representation and obtain the Lee-Yang zeros forN , 100. Through the asymptotic evaluation of the contour integral we evaluate the zeros for higherN. This asymptotic evaluation displays a Stokes phenomenon providing a different viewpoint of the mechanism by which a phase transition can arise, supplementing the picture of Lee and Yang. We also reproduce and extend somewhat the results of Smith for the finite-size scaling limit of the partition function.     

Generalization of the Brewster phenomenon for the wave diffraction process

Polarization anomalies of the Brewster type are considered for processes such as wave reflection, wave scattering, wave diffraction by surface grating and surface plasmon waves. Generalized conditions for Brewster anomalies in wave diffraction are written in analytical form. The application of the Brewster phenomenon for integrated optical polarizers is investigated numerically.     

初中生化学学科能力性别差异研究*

基于化学学科能力建构的基本框架,研究初中学生化学学科能力的分化水平和性别差异之间的关系。通过设计“初中化学学科能力”专项测试题,对132名男生、108名女生进行纸笔测试,并用SAS.9.4软件对测试结果进行量化处理,发现初中生的化学学科能力存在不同程度的分化现象,男生和女生在化学学科能力上存在性别差异,尤其在模型思维能力、定量化能力上男生比女生均有明显的优势。     

Dynamical symmetry analysis of ionization and harmonic generation of atoms in bichromatic laser pulses

Recently the effect of the relative phase ? in a high‐intensity (～10¹⁴ W/cm²) two‐color (bichromatic) CW laser with frequencies ω and 2ω on the high‐order harmonic generation (HHG) was studied within the framework of the non‐Hermitian quantum mechanics (NHQM) [Phys Rev A 2004, 69, 043404/1]. Here we emphasize the study of symmetries in bichromatic HHG spectra within the framework of the conventional Hermitian QM, and in particular by taking the duration of the laser pulse into consideration (an effect that has not been included in the non‐Hermitian studies due to the time asymmetry problem in NHQM). The phase dependence of HHG and intense‐field ionization probability in a 1D Xe atom with symmetric field‐free potential and symmetric initial wave function were studied numerically and analytically. From simulations based on a single‐particle response it can be seen that the HHG spectra is symmetric with respect to inversion in the relative phase between the two colors ? only if ionization is forbidden in the system and the laser pulse is an adiabatic one. The HHG spectra is symmetric with respect to a π‐shift in ? whenever the laser pulse is an adiabatic one, either for bound or open (ionized) systems. The ionization probability is symmetric both to inversion or π‐shift in ?; the component probabilities (right‐ and left‐ionization probabilities) have the same ?‐dependence, up to a shift of π. © 2005 Wiley Periodicals, Inc. Int J Quantum Chem, 2005     

理学ZSX PrimusⅡX射线荧光光谱仪日常维护及常见故障维修

主要介绍了理学ZSX PrimusⅡX射线荧光光谱仪的一些日常保养和出现故障的现象及处理方法。     

非恒温CO表面催化氧化体系双随机共振

当考虑化学反应热、热传导和热辐射的影响时, Pt(110)/CO+O2表面催化氧化体系温度出现时空变化. 以衬底温度为控制参数, 通过计算机模拟, 研究了衬底温度噪声对该非恒温表面反应体系振荡动力学行为的影响. 研究发现, 温度噪声可以诱导体系双随机共振现象, 而且增大衬底温度可以使体系共振行为由双随机共振变为单随机共振. 这表明体系可以利用温度噪声加强其反应振荡, 并对其具有双重选择性, 人们可以通过改变衬底温度大小来控制体系的共振行为.