大型电渣支承辊用钢YB-70的生产试制

支承辊用钢YB-70,更新换代产品,钢种的共晶碳化物难以消除,选份结晶是其生产试制的难点。     

Using resource networks to model substance distribution in aqueous medium

We suggest a certain model based on a resource network in the form of a regular two-dimensional grid. Nodes of the grid correspond to the amounts of substance concentrated in the given area. On the other hand, the edges of the grid represent the values of cross-currents. Under a specified field of currents, the model simulates distribution of a substance within a given water body.     

Synthesizing optimization algorithms for scheduling partially ordered set of problems

We consider the issues of optimal algorithms synthesis in the scheduling theory from a set of heuristic algorithms with low computational complexity. Optimal algorithm is derived which includes no more than seven tasks with identical duration of operations.     

Mathematical modeling of nonlinearly viscous fluid motion: Strong solutions

This paper studies mathematical modeling of motion of a nonlinearly viscous fluid in the case of strong solutions.     

Spherical and cylindrical waves in vapor-gas mixtures with polydisperse particles and drops

Propagation of plane, spherical, and cylindrical waves in vapor-gas mixtures with polydisperse particles and droplets, where one of the fractions is involved in phase transformations, was studied. A disperse correlation was obtained, and disperse curves were computed. The influence of polydispersity of particles and droplets on dispersion and dissipation of small perturbations was analyzed.     

Structure refinement and thermal stability of gibbsite

The crystal structure of gibbsite (aluminum hydroxide) has been refined by Rietveld powder diffraction analysis, and the thermal stability of the crystal structure of the mineral has been studied in detail by high-temperature X-ray diffraction. The X-ray diffraction data obtained in the temperature range from 25 to 300°C indicate that the crystal structure of gibbsite is stable up to 200–250°C. The unit-cell parameters of gibbsite increase with temperature. Above 200°C, the gibbsite to boehmite (AlO(OH)) phase transformation begins.     

基于微博重复发送的垃圾用户甄别

针对微博平台上的垃圾用户甄别问题,本文提出了基于微博重复发送行为的垃圾用户行为建模和甄别算法。在真实微博垃圾用户数据分析的基础上,本建模方法综合考虑了微博垃圾用户的行为信息、社交网络信息和文本信息,从不同的角度对垃圾用户进行了分析和建模。在真实数据集上的实验证明了方法的有效性,并且对模型中若干参数进行了优化,同时也分析了垃圾用户行为信息、社交网络信息和文本信息对模型的影响程度。     

Metallographic examination of the structure of the metal of cold arms of the nineteenth-early twentieth centuries made at the Zlatoust arms factory

Data are given concerning the structure and the chemical composition of carbon steel used for making cold arms, which was produced at the Zlatoust arms factory in the nineteenth and early twentieth centuries. The results of the analysis of the structure of metal demonstrates the general trend of the development of metallurgy both at the Ural plants and in the world: from the creation of the crucible methods of production of cast steel to the mass production of cast steel by the Bessemer and Martin methods.     

Structural peculiarities of Bi,Pb-2223/Ag composites annealed in an N<Subscript>2</Subscript>-O<Subscript>2</Subscript> atmosphere

X-ray diffraction analysis, transmission and scanning electron microscopy, and electron microprobe analysis were used to study Bi,Pb-2223/Ag composites annealed in a low-oxygen atmosphere (7.5% O₂ + 92.5% N₂). The ceramics was found to be characterized by some nonuniformity in the distribution of all the components. Two structural peculiarities of the 2223 phase were found. These are the existence of atomic displacement waves, which are related to the oxygen deficiency or nitrogen substitution for oxygen, and a more intense Ag penetration into the ceramics, which results from the annealing in the O₂-N₂ atmosphere at a pressure of 10 atm. The unstable state of the lattice characterized by oxygen atomic displacement waves is due to the prolonged annealing in oxygen-depleted atmosphere. Usually, in the case of other favorable factors of the ceramics structure, the lattice instability positively affects the superconducting properties of the ceramics.