In order to represent the signification of drainage gas recovery influence, based on the circumstance of technique lectotype in gas reservoir, gas well and surface, we summarized the essential thoughts and methods of technique lectotype according to the experience of d.

A process selection model in electrical discharge machining(EDM) based on improved back-propagation(BP) NN is introduced.

For the homemade design of large size dry air cooled heat exchanger in natural gas processing plant, a summary and analysis for the main technical measures and problem that were encountered at the calculation of the processing choice of equipment model and the structure design have made.

One example is discussed in the paper which presents the results of a detailed study undertaken for processing technology, for the comprehensive recovery of the metals in the ore, and confirms the optimizing floation flowsheet of lead-zinc in turn.

According to characteristics of mineral processing technology for greisen-type micronization tungsten-tin ore of low grade.

Effect of breaking on the washing technique and benefit of lump anthracite;