In coal mining hard roofs are one of the main factors causing the occurrence of rock bursts in working panels. To solve this problem, the solid backfill coal mining (SBCM) technique is proposed and used as an effective measure to prevent the rock bursts induced by hard roofs. However, due to the different backfill ratios of working planes, the control effects on hard roofs are quite unique. By ...

In this paper, various methods have been used to control and evaluate engineering difficulties in mining accurately. Different unstable scenarios occurring at the surfaces of underground mine walls, identified by comparing 3D terrestrial laser scanning surveys subsequent point cloud analysis. These techniques, combined with a change detection analysis approach integration rock mechanics’ modell...

Gem GTPase is a member of a protein family that includes Rad, Rem and Rem2. Although until recently precious little was known about the function of Gem, recent studies have revealed that Gem may influence cell morphology by antagonising the actions of the Rho GTPase effector protein ROCK I.

Vascular calcification is widely regarded as merely a rare, end-stage, passive, degenerative, and inevitable process of aging. Decades ago, atherosclerosis had been similarly dismissed, but extensive research finally demonstrated its active regulation. Current research is now revising outdated views of vascular calcification. New imaging techniques made it clear that coronary calcification is n...

Nine rock types including Sandstone, Limestone, Siltstone, Dolomite and Marl collected from six different rock formations of the Salt Range area of Pakistan were tested to evaluate the correlations between the uniaxial compressive strength and the corresponding values of the point load index. Two hundred rock cores were drilled and used for the uniaxial compressive strength and point load index...

In this chapter possibilities of the improvement of drilling tool efficiency on the basis of the analysis of mechanisms of rock destruction and some methods of the information theory are considered. Physical mechanisms of destruction of hard and plastic rocks under different conditions of mechanical loading are reviewed. Some physical effects which allow to improve the efficiency of rock drilli...

Lithological characteristics, mineral composition, physical properties of water and physical and mechanical properties, weathering zone distribution and other factors of bedrock weathering zone in coal-seam roof determine the strength of its watertight performance, while its performance has a direct impact on impermeable overlying loose surface water aquifers as well as the possible collapse in...

Challenges What are some of the challenges facing management today? The answer to this question can be different for each flight program. However, one trait most air medical programs have in common is that they are managed by those with medical rather than aviation backgrounds) By learning more about the aviation side of program management, managers can benefit their programs in respect to safe...