background: airport workers are continuously exposed to different levels of radiofrequency microwave (rf/mw) radiation emitted by radar equipments. radars are extensively used in military and aviation industries. over the past several years, our lab has focused on the health effects of exposure to different sources of electromagnetic fields such as cellular phones, mobile base stations, mobile ...

Grouting treatment is the main technology to reduce or eliminate residual deformation and activation of foundations in goaf sites. Under influences overburden mining, distribution grouting foundation quite different from that conventional mechanism porous media. In this paper, considering time-dependent viscosity diffusion path slurry, permeation Bingham fluid derived based on seepage motion eq...

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 ...

Surface movement under the combined mining of open-pit and underground caving is main problem affecting safe efficient mining. Taking Dahongshan Iron Mine as an example, a mechanical model for calculating surface range was established to reveal mechanism. The topography, zone, gravel filling zone depth were considered, principal stress calculated. Based on model, relationship between subsidence...

Abstruc/A Mobile Ad-hoc'NETwork (MANET), also referred as Independent Basic Service Set (IBSS), has nodes which not only sendlreceive'packets associated with them but also co-operate in forwarding dataand control packets for the network. Efficient use of energy by the mobile nodes is very important to increase the lifetime of MANET. Since nodes seldom have packets to receive, they remain in Idl...

When using the explicit dynamic relaxation approach (DRA) to model quasi-static rock breakage, fragmentation, and flow problems, especially top-coal caving question, introducing numerical damping into solution equation is inevitable for reducing vibration frequency impact speed of mesh nodes, which significantly affect fidelity computation results. Although DRA has been widely adopted simulate ...