In extra-thick coal seams, mining operations can lead to large-scale disturbances, complex overburden structures, and frequent and strong strata behavior in the stope, which are serious threats to mine safety. This study analyzed the overburden structure and strata behavior and proposed the technique of confined blasting in water-filled deep holes as a measure to prevent strong rock pressure. I...

Let C be a locally planar curve. Its versal deformation admits a stratification by the genera of the fibres. The strata are singular; we show that their multiplicities at the central point are determined by the Euler numbers of the Hilbert schemes of points on C. These Euler numbers have made two prior appearances. First, in certain simple cases, they control the contribution of C to the Pandha...

For well over two decades, the public health community has undertaken a broad range of initiatives to identify and eliminate various health-related disparities among populations. The Centers for Disease Control and Prevention's (CDC) Office on Smoking and Health (OSH), for example, has committed resources to help states eliminate population disparities related to tobacco use. These initiatives ...

This paper proposes two new Mantel-Haenszel test statistics for correlated binary data in 2 x 2 tables that are asymptotically valid in both sparse data (many strata) and large-strata limiting models. Monte Carlo experiments show that the statistics compare favorably to previously proposed test statistics, especially for 5-25 small to moderate-sized strata. Confidence intervals are also obtaine...

The objective of the current study was to evaluate outcomes of a program to prevent traffic injuries among the different social strata under WHO Safe Community Program. A quasi-experimental design was used, with preand postimplementation registrations in the program implementation area (population 41,000) and in a neighbouring control municipality (population 26,000) in Östergötland County, Swe...

We prove that for a generic element in nonhyperelliptic component of an abelian stratum $\mathcal{H}_g(\mu)$ genus $g$, the underlying curve has maximal gonality. extend this result to case quadratic strata when partition $\mu$ positive entries. As consequence we deduce all components $\mathcal{H}_9(\mu)$ are uniruled is 16 and $\mathcal{H}^2_g(\mu)$ $4g-4$ either $3\leq g\leq5$ or $g=6$ $l(\mu...

Planktonic foraminifera and major palynomorph groups (i.e. terrestrial, marine, and amorphous organic matter) of the Campanian-Selandian strata of the Gurpi Formation were studied to evaluate the changes in the Zagros paleobasin in southwestern Iran. Planktonic foraminifera were categorized into four morphotypes according to their paleodepth, extending from Morphotype 1, comprising surface gene...