Abstract Background PCR amplification of bacterial 16S rRNA genes provides the most comprehensive and flexible means of sampling bacterial communities.Sequence analysis of these cloned fragments can provide a qualitative and quantitative insight of the microbial population under scrutiny although this approach is not suited to large-scale screening
In order to determine influence of ventilation mode on dust distribution on fully mechanized heading face and explore dust reduction effect under different ventilation modes, the 209 fully mechanized heading face of Longde Coal Mine was taken as research object, and the software of FLUENT was used to simulate distribution of dust in the roadway and
Wear is one of the main factors of machine failure.If abnormal wear was not detected in time during the operation of a mechanical system, it probably leads to catastrophic consequences.The wear debris in the lubricating oil circuit contains much information about equipment wear.Consequently, debris detection is regarded as an effective way to detec