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Calculation of the residual strength of stiffened structures

A method for calculating the residual strength of a stiffened structure (panel) taking into account the stable growth of a crack is presented. The use of the R curve of material is based on experimental data. Calculated results are compared with experimental data.     

Tar Produced in the Coking of Rammed Batch

The yield of tar and its properties in the coking of rammed batch is of particular interest in the light of the broader adoption of this technology. In laboratory reactors, the tar yield from rammed batch is lower than for unrammed batch. However, in industrial furnaces, the tar obtained in the coking of rammed batch is characterized by lower levels of pyrolysis. It is evident from analysis of the tar’s quality, viscosity, and group composition and also from granulometric analysis of the quinoline-insoluble components that the primary destruction products of the thermochemical processes in the coking of rammed batch react with the solid and liquid phases.     

Reducing the corrosion losses of metals when using phenolic wastewater in coke-plant cooling systems

The influence of corrosion and nitrification inhibitors based on thiocyanates, silicates, and phosphates, as well as coagulant additives, on the corrosive activity of phenolic wastewater used to cool coke-oven gas is investigated. Such inhibitors markedly slow corrosion. Thus, by using phenolic wastewater from coke plants, the consumption of pure natural water may be reduced.     

Deactivation of titanium during temperature-induced hydrogen absorption–desorption cycling: I. Effects of water, oxygen and nitrogen traces

The cyclic stability of metallic titanium during absorption–desorption runs in continuous flow system has been studied in the presence of variable level of impurities such as H₂O, O₂ and N₂ in argon and helium flows. Hydrogen absorption–desorption cycles performed in vacuo were reproducible with respect to the absorption rates and uptakes, while absorption–desorption cycles carried out in the flows of carrier gases in the thermoprogrammed mode resulted in the gradual decrease of hydrogen uptakes followed by a shift of absorption maxima from 800 K to 1000 K.

Mass-spectral analysis of the main impurities in a flow of gases revealed that during hydrogen absorption–desorption traces of water, oxygen and nitrogen are consumed by titanium. For the samples subjected to several absorption–desorption cycles in the flow of inert gas XRD revealed the formation of nitrogen-containing titanium compounds, while XPS showed surface enrichment in nitrogen, while oxygen concentration was constant. Nitrogen consumed at higher temperatures during the TPD runs provides better inhibition of hydrogen absorption compared to water and oxygen. Final deactivation state of titanium correlates in general with the overall amount of impurities in the stream.

Although deactivation is controlled mostly by the level of toxic impurities in the feed, certain parameters, i.e., hydrogen absorption/desorption rates are dependent on the nature of neutral media—in contrast to helium, noticeable hydrogen desorption occurs even at room temperature in a flow of pure argon.