Quantum analysis of measurement results

It is shown that a stochastic matrix operator (quantum measurement matrix) may be considered in some cases as a density matrix. Results of measurements in the form of figure numbers, interconnected with a matrix of quantum measurements, are similar to quantum observable quantities determined in quantum statistical theory. __________ Translated from Izmeritel’naya Tekhnika, No. 12, pp. 3–8, December, 2006.     

Some spectral response characteristics of ZnTe thin films

Zinc telluride thin films have been grown at room temperature and higher temperature substrates by thermal evaporation technique in a vacuum of 10^-6 torr. A main peak in the photocurrent is observed at 781 nm (1.58 eV) with two lower amplitude peaks on the lower wavelength side and one on higher wavelength side. The evaluated thermal activation energy is found to correspond well with the main spectral peak. From these studies it can be inferred that temperatures up to 453 K is still in the extrinsic conductivity region of the studied ZnTe thin films. The paper was presented at the 6th Asian Thermophysical Properties Conference (6th ATPC), held at Gauhati University, during 8–11 October 2001.     

Conjugate filters with spectral-like resolution for 2D incompressible flows

A conjugate filter oscillation reduction scheme originally developed for compressible flows and in general for hyperbolic conservation laws is applied to the solution of the incompressible Navier-Stokes equation with periodic boundary conditions. Conjugate low-pass and high-pass filters are constructed by using a local spectral method, the discrete singular convolution algorithm. A spectral-like resolution, i.e., near the machine precision obtained at a sampling rate close to the Nyquist limit (2 points per wavelength), is achieved in treating a smooth initial value problem which admits an exact solution. The spectral-like resolution is enhanced by the use of conjugate low-pass filters in treating the double shear layer and multi-shear layer problems, which exhibit extremely small flow features.     

任意形状螺线管磁场的研究

导出了任意形状通电螺线管所产生的磁场在空间的分布情况，并讨论了螺线管在仪器设备中的普遍应用，给出了这类仪器设计中磁场计算的可靠模型     

多声部乐谱图象识别系统

文章提出一个完整的系统，将多声部乐谱原文转换成可编辑乐谱文本。系统首先在乐符检测阶段将图象切分为谱表，然后再其切分成个别对象。     

环境氡气辐射规律及防治研究

氡对人体的辐射伤害占人体所受到的全部环境辐射的55%以上。氡气会导致肺癌、白血病、皮肤癌及其它呼吸道病变的产生。本文在国内外相近课题研究基础上,采用仪器测量及理论分析相结合的方法,对全国各地多种地质构造取样的数据进行分析处理,总结了地壳中放射性元素的分布规律及大气中氡的来源。文章着重从岩石、土壤、地下(热)水、矿山及室内几个方面讨论了氡浓度的影响因素及分布规律。最后提出了室内氡气防治方法及降氡措施,以便更好地进行放射性环境评价以避免氡对人体的危害。     

The Conditional Probability Density Function for a Reflected Brownian Motion

Models in economics and other fields often require a restricted Brownian motion because frequently implicit or explicit barriers restrict the domain. This paper contributes to the literature on reflected Brownian motion by deriving its conditional density function as a closed-form expression that consists of infinite sums of Gaussian densities. This solution is compared with an alternative, trigonometric expression derived earlier. Numerical analyses reveal that convergence properties of the expression derived in this paper are superior to those of the alternative representation for most practically relevant set-ups. Despite the complex appearance of the density formula, its use only requires fractions of a second on simple desktop computers such that, next to the theoretical appeal, also practicability is guaranteed.     

H_2S·HO_2氢键配合物的量子化学研究

用B3LYP/6 31 1 + +G 方法研究了H2 S与HO2 自由基之间的氢键。发现了三个能量极小点。同时做了H2 S·HO2 的振动频率分析。计算预测了能量整体最小点的构型为带有 2个扭曲的氢键的五元环结构     

An Analytical Equation of State for Alkaline Earth Metals

In this work, an analytical equation of state based on statistical mechanical perturbation theory, which was initially developed for normal fluids and can be applied to predict the P–V–T data for saturated liquid alkaline earth metals, is presented. The equation of state is that of Ihm, Song, and Mason, and the temperature-dependent parameters of the equation of state are calculated from a corresponding-states correlation as functions of the reduced temperature. Two scaling constants are sufficient for this purpose, the surface tension and the liquid density at the melting point. The equation of state is used to predict the saturated liquid density of molten alkaline earth metals from the melting point up to 2000 K, for which experimental data exist, within an accuracy of 5%.     

絮凝体的物理特性

从絮凝体的密度,空隙率、絮凝体的粒径分布,絮凝体的强度以及絮凝体的分形维数五个方面综述了絮凝体的物理特性及结构特性,分析了影响絮凝体物理特性的因素。