Detailed characterization of respirable coal mine dust is critical to understanding occupational health outcomes, as well improving exposure monitoring and controls in mines. However, data on characteristics such particle size mineralogy are still scarce, there virtually no datasets available that allow direct comparisons across many Following up a previous effort characterize from eight underg...

In 1948 roof falls were the number one killer of coal miners in America. While the Bureau of Mines had been formed in 1910 to improve coalmine safety, it had largely focused on explosions, for which technological solutions appeared to exist. Roof falls, by contrast, were not amenable to a technical fix. Beginning in 1948, however, the Bureau discovered roof bolting, which it promoted as a safer...

Researchers at the National Institute for Occupational Safety and Health studied mining accidents that involved a worker entangled in, struck by, or in contact with machinery or equipment in motion. The motivation for this study came from the large number of severe accidents, i.e. accidents resulting in a fatality or permanent disability, that are occurring despite available interventions. Acci...

As the main means of monitoring and early warning of geological disaster, the slope stability analysis is an important part of the geological disaster prevention project. GIS plays an important role in the evaluation of slope stability due to its powerful functions for data processing and spatial analysis. This article discusses the key technology of GIS applied in the slope bolt support design...

Selecting the incorrect control during the operation of underground bolting and drilling equipment causes serious injuries. Shape coding and the layout of dual control banks are two aspects of control design which require further examination. The aims of this research were: (i) to determine whether arbitrary shape coding was effective in reducing selection error rates in a virtual analogy of ro...

The stability of a tunnel face and the rationality its supporting structures are guarantees for safe construction. This paper established quantitative analysis model stability, obtained calculation formula coefficient based on silo theory surrounding rock, then realized description under condition pipe roofing support, bolting grouting support reserved core soil. Finally, discrimination optimiz...

Abstract The modern society greatly utilizes automobiles to fulfill the requirements of transport, and it is logically necessary research most efficient joinery method arrangements construct automobiles. In contemporary stage technology, three mainstream methods are bolting, riveting welding, among these methods, bolting could be used for cylinder head block, might suitable means aluminum alloy...

Our current knowledge about sulfur (S) management by winter oilseed rape to satisfy the S demand of developing seeds is still scarce, particularly in relation to S restriction. Our goals were to determine the physiological processes related to S use efficiency that led to maintain the seed yield and quality when S limitation occurred at the bolting or early flowering stages. To address these qu...

To explore the mechanical failure characteristics of bolted joints under different bolt installation angles and effect bolting on shear strength joints, a numerical model structural plane anchoring with was established based improved Pile element, series uniaxial compression tests were carried out to systematically study effects angle bolts. The results show that as increases, peak stress speci...