Such a system is a good tool for high-resolution imaging and high-precision height information extraction, which has the potential for future mission both in civil and military applications.
The multivariate optimization data (Additional file 1) were further analyzed by linear regression with the instrument signal as the dependent variable, and it was found that the single important factor influencing the peak height is extraction speed.
The ratio of effective extraction height to actual mining height is called subsidence factor under backfill.
Enchytraeids were sampled using six-fold cores (diameter 5.8 cm×15 cm, 6 rings of 2.5 cm height each), extracted using wet funnel extraction, identified, measured and counted.
After SeptiFast analysis of the 20-microbial-target sample mix, we compared melting temperature (Tm) and peak heights for both extraction methods.
Case studies are given to arrest the adverse effects of extraction height on pillars.
Similar to our results, Tomusiak and Magnuszewski (2009) observed increased growth at breast height after resin extraction in Scots pine in Poland.
Typically, in the evaluation of surface subsidence under backfill, the term of effective extraction height is proposed (Singh and Singh 1985; Miao et al. 2010), which represents the actual thickness of voids transferred finally to the ground surface and is just part of the actual mining height.
where S is the strength of pillar, σ c is the compressive strength of one 2.5 cm cube of coal (MPa), h is the extraction height (m), H is the depth of cover (m) and W is the pillar width (m).
Field investigations (Singh et al. 1996) showed that the nature of development of mining induced stress over pillar/stook at different stages of depillaring, for a nearly flat coal seam, is influenced by different parameters like depth of cover, characteristics of overlying strata, distance from face line, extraction height and goaf treatment.
