Papers by Mostafa Sharifzadeh
Tunnelling and Underground Space Technology, 2014
ABSTRACT In the challenging environment and changing topology of a mine, reliable and effective c... more ABSTRACT In the challenging environment and changing topology of a mine, reliable and effective communication is a high-stake issue along with the objectives of safe and efficient mining operations. Automation by remote and automatic systems have improved workplace health and safety for employees, cost-effectiveness, management of technical problems, energy saving, real-time response to events. In response to these challenges, wireless sensor networks (WSNs) have been widely employed in underground monitoring and communication systems for the purpose of environmental monitoring, positioning of workers and equipment, operational monitoring and communication system. Considering the capabilities of WSNs, ZigBee network is adapted. In this study, common WSNs are evaluated for application in underground mines and demonstrated why ZigBee network performance is suitable for such environments. ZigBee radio waves attenuation is investigated to evaluate stable communication range between ZigBee nodes at straight and curved tunnels in a real mine scenario. Moreover, experimental measurements of ZigBee radio waves attenuation are validated by simulation results. Based on the analysis of the experimental and simulation results, the effective factors on the radio waves attenuation in the junctions, curvatures and fields near and far from the source are assessed. Finally, stable wireless communication ranges between developed ZigBee nodes in the underground Angas Zinc Mine is concluded 100 m and 70 m for straight and curved tunnels, respectively. The development of ZigBee network application compared to other WSNs in underground mines is also approved.
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ABSTRACT: Fractures in rock mass are the main flow paths and introduce as a most important attrib... more ABSTRACT: Fractures in rock mass are the main flow paths and introduce as a most important attribute in rock mass hydraulic behavior. Hydraulic properties of rock mass are important in civil, mining, and environmental such as Isolation of hazardous and nuclear waste, petroleum and geothermal energy. In this paper, single-phase fluid flow through a rock fracture was studied. Computational domain for an artificial three-dimensional fracture was generated and used for numerical fluid flow simulations. Both laminar and turbulent flow simulations were performed for a wide range of inlet velocities. The results show that the relation between pressure drop and flow rate has a quadratic polynomial form and Forchheimer law was fitted very well to flow simulation results. Also the predicted static pressure drop for turbulent flow simulation was roughly 3% to 17% more than those predicted with laminar flow simulation at Reynolds number of 4.5 to 89.5, respectively.
Proceedings of the 1st Canada-US Rock Mechanics Symposium, Vancouver, Canada, 27–31 May 2007, 2007
Radiation Physics and Chemistry, 2002
A new thin film dosimeter has been developed by using a chlorine-containing polymer matrix doped ... more A new thin film dosimeter has been developed by using a chlorine-containing polymer matrix doped with malachite green methoxide as an indicator. Gamma irradiation of the film induces blue characteristic colour. The produced film with an average thickness of 0.05mm has a linear response over the dose range of 1–60kGy at the measured wavelength of 630nm. The effects of temperature
Proceedings of the 3 rd International Symposium GeoProc'2008, 2013
International Journal of Mining Science and Technology, 2013
Uniaxial compressive strength Modulus of elasticity Rock index property a b s t r a c t
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Papers by Mostafa Sharifzadeh