The longwall mining method is one of the most applied methods in extracting low-inclined to high-inclined coal seams. Selection of the most suitable extraction equipment is very important in the economical, safety, and productivity aspects of mining operations. There are a lot of parameters affecting the selection of an extraction equipment in mechanized longwall mining in steeply inclined coal...

The authors have been involved in the implementation of a total quality control project in a communications equipment company, whose products are mounted and tested in a manufacturing plant controlled by an IBM Token Ring LAN. The first implementation of total quality control project was an ATE (Automatic Test Equipment) LAN node that runs a program of verification for single-channel and multic...

The microalgal pigment phycoerythrin (PE) is of commercial interest as natural colorant in food and cosmetics, as well as fluoroprobes for laboratory analysis. Several methods for extraction and quantification of PE are available but they comprise typically various extraction buffers, repetitive freeze-thaw cycles and liquid nitrogen, making extraction procedures more complicated. A simple meth...

In enterprises operating large-scale equipment, such as plant enterprises, maintenance workers must quickly and accurately find understand the information required in equipment documents to perform tasks effectively. If exist each file for sentence expression constituting document is ambiguous, it will interfere with effective performance of maintenance, leads loss company. order solve these pr...