In this study, a new method was examined that used acoustic emission (AE) monitoring data, in combination with primary Boundary Element stress analysis, to back-calculate rock mass strength. The presented AE data came from the National Radioactive Waste Repository (NRWR) for low- and intermediate-level waste (LLW/ILW). is able detect pre-peak, peak, post-peak changes mass. parameters, such as u...

Underground nuclear explosions generate non-isothermal two-phase flow, heat and mass transfer, tracer transport through fractured porous media. The governing equations of these coupled phenomena on the Darcy scale are presented corresponding numerical code is briefly described. Two configurations considered. In first one, damaged zone generated by explosion replaced equivalent macroscopic bound...

Along with the increasing excavation of underground spaces, mining industry has developed various techniques for refilling these voids. One them is cemented paste backfill (CBP), coming from mixing tailings water and a binder. These pastes are then transported to cavities through pipes into voids, which they fill in layering pattern. In this paper we explore capabilities simplified thin-film mo...

Abstract The occurrence of strong and abrupt rainfall, together with a wrong land use planning an uncontrolled urban development, can constitute risk for infrastructure population. water flow in the subsoil, under certain conditions, may cause underground cavities formation. This phenomena known as soil piping evolve generate surface collapse. It is clear that such densely urbanized areas repre...

OBJECTIVES Radon concentrations for 31 Polish underground tourist routes were analyzed. The equivalent dose to the lung, the effective dose and the relative risk were calculated for employees of the analyzed routes on the grounds of information on radon concentrations, work time, etc. MATERIAL AND METHODS The relative risk for lung cancers was calculated using the Biological Effects of Ionizi...

Fatal accidents associated with underground coal mines require the implementation of high-level gas monitoring and miner’s localization approaches to promote underground safety and health. This study introduces a real-time monitoring, event-reporting and early-warning platform, based on cluster analysis for outlier detection, spatiotemporal statistical analysis, and an RSS range-based weighted ...

Wireless underground sensor networks (WUSNs) consist of buried nodes, which are connected to subsurface underground sensors, and use electromagnetic (EM) waves for underground communications. WUSNs are capable of operating in environments where no other computer network has functioned before, and has the potential to provide real-time, robust, and energy efficient sensing, and communication in ...

UNLABELLED The presence of a cavitary lesion is important factor for pulmonary Mycobacterium avium complex (MAC) treatment. PURPOSE Clarify the location of pulmonary MAC cavities and the changes of these cavities. MATERIAL & METHODS We observed the location of 56 cavities in 48 patients with pulmonary MAC on computed tomography (CT) images and evaluated the changes in the external diameter ...

Omega3P is a parallel eigenmode calculation code for accelerator cavities in frequency domain analysis using finite-element methods. In this report, we will present detailed finite-element formulations and resulting eigenvalue problems for lossless cavities, cavities with lossy materials, cavities with imperfectly conducting surfaces, and cavities with waveguide coupling. We will discuss the pa...

Between 1990 and 1992 an extensive artificial cavity installation program was conducted on the Francis Marion National Forest (FMNF) in coastal South Carolina where Hurricane Hugo had caused vast devastation. Four artificial cavity types were installed: drilled starts, drilled cavities, modified drilled cavities, and inserts. In 1998, we examined 443 of the artificial cavities (average age 8.5 ...