Effect of high-temperature corrosion on the gas-abrasive resistance of electric-arc coatings

We study the high-temperature gas-abrasive wear resistance of electric-arc coatings sprayed from powder wires. It is shown that the wear resistance of these coatings increases with temperature. This is explained by the effect of strengthening of lamellae in the coating, segregation of the dispersed phases, and the appearance of aluminum and chromium oxides (characterized by high shock resistance) both on the surface and between the lamellae. These coatings can be used for the restoration and protection of the heat-exchange surfaces of boilers of thermal power plants, including the large-size waterwall tubes and the tubes of economizers.     

Evaluation of the State of Subsurface Layers of the Metal Subjected to Shot Peening with the Help of Surface Acoustic Waves

Materials Science - We study the surface layers of the metal of low-carbon steel after shot peening. The velocity of surface Rayleigh waves is determined by the pulse-phase method at frequencies of...     

下载新方向，快用“磁力”下载

如何用“磁力下载”下载电影。     

MPLS QoS的研究

本文主要介绍了解决IP QoS的两种基本模型:综合业务模型(Int-serv)和区别业务模型(Diff-serv)。Int-serv模型适用于规模较小、业务质量要求较高的边缘网络,Diff-serv模型则适于骨干网。同时ATM MPLS Diff-serv解决方案也在文中作了论述。     

关电脑，只需按一下So easy!

让爸爸妈妈最能接受神圣的最简单的关机方法。     

Development Zones and Evolvement of Urban Spatial Structure: A Case Study on Lanzhou City

In the 20 years since they first emerged as influential elements in urban China, development zones have become an impor tant factor in promoting the spatial optimization of urban areas     

Time optimal control of linear systems with delay†

Necessary conditions, analogous to those of Pontryagin's maximum principle are developed for the problem of reducing the state, of linear systems with delay, to zero in minimum time. An example is presented that demonstrates the technique of finding the time optimal control.