全球宽带接入市场发展趋势

从用户数持续快速增长、宽带用户数最多的国家和地区、宽带用户增量、宽带用户增长率以及宽带业务普及率等5个方面阐明了全球宽带接入市场的总体情况。分析指出宽带接入技术发展趋势．DSL在近两年内仍将占据主流地位。介招了宽带增值业务发展情况。     

选频放大器的特殊应用与多频率峰值现象的分析

本文分析了一种特殊应用的选频放大器,分析它的多频率峰值、幅值干扰、谐波干扰等电子学现象。向读者提供一个有实用价值的设计方案和一组参考数据。     

安钢3#高炉大喷煤量探索

安钢3^#高炉采用全烟煤喷吹。提高煤粉燃烧率、维持适宜的理论燃烧温度、保证煤气流的合理分布是提高喷煤比的关键。本文介绍安钢就如何提高3^#高炉喷煤量及大喷煤量下的高炉操作进行探索并取得了良好技术指标（煤比提高24kg／t，焦比降低了43kg／t）的生产实践。     

Application of K008 camera in diagnostics of shock and detonation waves

Results of tests of the K008 camera to determine its resistance to the action of factors that accompany gaseodynamic experiments, such as powerful electromagnetic, acoustic, and optical interference, and its application as a component of laser Doppler velocity meters of objects thrown by an explosion are presented. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 46–49, May, 2007.     

Analysis of Heat Transference in Regenerative Exchanger of a Thermal Power Plant

The process of electricity generation in a power plant involves several phases for heat exchange generally between hot fluid (water, fumes of steam) and one of the input fluids (cool water, cook oven gas, fuel, blast furnace gas, etc) The process of exchange evolves in time at the same time as installation itself. This improvement is another step in a deep study of the time-changing conditions of the heat transmission due to ageing, but it will also make possible the introduction of new parameters in the physical formulation whose relation is unknown. Modelling is done using feedforward neural networks after a very extensive pre-processing step.     

图中含有k—因子的判定算法

本文依据图论中已有的一个理论成果（定理１），给出了判定一个图是否含有k-因子的一个算法，同时对算法的复杂性作了分析，又示出了一些简单情况的结果。     

Effect of oxidation on the performance of low-temperature petroleum cokes as anodes in lithium ion batteries

The effect of an oxidative treatment on the electrochemical performance of various low-temperature cokes as anodes in lithium ion batteries was examined in order to optimize their chemical composition and textural properties. Annealing in a stream of dry synthetic air over short time and temperature ranges was found to result in substantially increased cell capacity and improved capacity retention during cycling in coke oxidized at 350 °C for 1 h, which exhibited a capacity as high as 385 mAh g⁻¹ after 20 cycles at C/50. However, raising the oxidation temperature to 500 °C resulted in undesirably increased irreversible capacity and polarization between the charge and discharge branches, the effect being confirmed by the high impedance values obtained after only a few cycles. ⁷Li MAS NMR spectroscopy was used to assess covalency in lithium bonds and its relationship to electrochemical performance in the studied batteries.