Maintenance of the roadway roof has been improved significantly, which ensures safe mining in coal seams with ultra-close separation.
The two antenna elements are designed using reversed one left handed unit cell for high mutual coupling isolation in close separation.
The roof of a roadway under goaf with ultra-close separation consists of thin rock strata and rocks caving in upper goaf.
An analytical relation between the proposed stage and point efficiencies has been developed for an ideal cross flow stage in a close separation barrier separation process.
Finally, the Stroop effect was numerically larger when the close keys were pressed by sticks held at the far separation than when the far keys were pressed by sticks held at the close separation, implicating distance between the keys rather than the hands as the main factor.
The two components are difficult to resolve with small amateur telescopes because of their difference in visual magnitude and their close separation.
Thus, π π interactions would require two POM units at a close separation, which is electrostatically unfavorable.
This bead had a diameter of 1.27 μm, smaller than the trapped bead to be able distinguish it from the other bead and also to avoid optical interaction with the laser beam when a close separation from the trapped bead [ 79].
Each individual nanoscrew was consisted of many small screw threads stacking along the longitudinal direction with close separations.
