论毛泽东诗词创作的两个维度

毛泽东是中国革命事业的开创者,也是一位杰出的古典诗人。毛泽东诗词具有鲜明的民族性与时代性,前者主要表现为强烈的爱国主义情感、民族自豪感与自信心,后者主要表现为强烈的忧患意识与救亡图存的历史使命感。民族性与时代性是他诗词创作艺术的纵横两个维度,且二者互为表里,贯穿于他诗词创作的全过程。     

转炉喷补技术及其发展

综合分析了转炉喷补技术及其发展。研究分析了湿法、干法、半干法及火焰喷补方法的使用特点。指出了转炉喷补技术的发展方向。     

拼搏加科技——从女排精神说起

概要地评述了我国PCB工业要赶超世界水平,就必须像中国女排精神那样：拼搏加科技才能做到!     

Canonical Orderings of Hexagons That: (1) Nearly Meet the Intent of Patterson's Nomenclature Rules and (2) Orient a Molecule for Purposes of Assigning a IUPAC Name

A nomenclature technique developed earlier by the author is expanded to produce an ordering of hexagons that nearly meets the original intent of Patterson's nomenclature rules in organic chemistry for a system of polycyclic aromatic hydrocarbons formed using only benzene modules. The result desired is a simple systematic method which orients a figure formed by the fusion of regular hexagonal rings so that, first, there is a maximum number of rings on a horizontal line and, second, that as many of the remaining rings as possible are above and to the right of this horizontal reference line. In the process of trying to formulate such a system, problems that are inherent in interpreting the intent of Patterson's rules and in pragmatically implementing these rules are examined. Furthermore, a minor modification of the technique produces a canonical orientation of a long molecule which can then be used to formulate the I.U.P.A.C. name for this molecule.     

Carbothermal nitridation process of mechanically milled silica sand using Taguchi's method

This paper reported on the work performed to study the formation of silicon nitride and silicon carbide whiskers using the carbothermal nitridation process. A distinctive aspect of the present study lies in the use of the mechanical milling method to alter the regularity of the crystalline network of the silica sand. In order to optimise the processing parameters for the synthesis of silicon carbide, the concept of Taguchi's Design of Experiments was considered, the analysis being based on Taguchi's signal to noise ratio and variance techniques to obtain optimum combination of process parameters. Important factors influencing the formation of silicon carbide were the duration of the mechanical milling, followed by temperature, time and heating rate.     

Optimisation de l'hydrolyse des protéines du lactosérum en utilisant des détergents commerciaux enzymatiques et non-enzymatiques

The main aim of this study is to characterize the effect of some commercial detergents on whey proteins in order to select an efficient detergent to clean inorganic membranes fouled during the process of whey proteins fractionation. The influence of such variables such as time, pH, temperature, type and detergent concentration on the rate of protein hydrolysis has been established. Also, the nature and size of produced peptides have been determined. The most efficient values of cleaning parameters have been obtained by using the enzymatic detergent P3-Ultrasil 62.     

A DUST PROOF MALODOROUS GAS TREATMENT REACTOR ANALYSIS

Through a series of experiments, an industrial kinetic model of oxidation reaction in ring catalyst beds has been developed, and a rational calculation procedure for specifying the reactor volume and geometry was derived.     

DIFFUSION AND REACTION WITH A LIMITED AMOUNT OF REACTANT

The rotational motion of a rigid particle is considered. The method of Green's functions is used which reduces the governing equation to a Fredholm's integral equation of the first kind. Numerical and analytical solutions are obtained with any stress singularities taken explicitly into account.     

Theory of confined states of positronium in spherical and circular quantum dots with Kane’s dispersion law

Confined states of a positronium (Ps) in the spherical and circular quantum dots (QDs) are theoretically investigated in two size quantization regimes: strong and weak. Two-band approximation of Kane’s dispersion law and parabolic dispersion law of charge carriers are considered. It is shown that electron-positron pair instability is a consequence of dimensionality reduction, not of the size quantization. The binding energies for the Ps in circular and spherical QDs are calculated. The Ps formation dependence on the QD radius is studied.     

A layer-wise MITC9 finite element for the free-vibration analysis of plates with piezo-patches

The present article considers the free-vibration analysis of plate structures with piezoelectric patches by means of a plate finite element with variable through-the-thickness layer-wise kinematic. The refined models used are derived from Carrera’s Unified Formulation (CUF) and they permit the vibration modes along the thickness to be accurately described. The finite-element method is employed and the plate element implemented has nine nodes, and the mixed interpolation of tensorial component (MITC) method is used to contrast the membrane and shear locking phenomenon. The related governing equations are derived from the principle of virtual displacement, extended to the analysis of electromechanical problems. An isotropic plate with piezoelectric patches is analyzed, with clamped-free boundary conditions and subjected to open- and short-circuit configurations. The results, obtained with different theories, are compared with the higher-order type solutions given in the literature. The conclusion is reached that the plate element based on the CUF is more suitable and efficient compared to the classical models in the study of multilayered structures embedding piezo-patches.