Engineering site and shaft pillars are excavated to prolong the life of collieries excavate more underground coal. The Jinggezhuang colliery (‘JGZ’) is a resource-exhausted coal mine in eastern China. It was determined that industrial pillar JGZ would be extracted 2008. This study an experimental panel examine effect excavation on surface buildings complicated geological conditions. A new desig...

As a new collaborative mining technology, the integration of mining-separating-backfilling (IMSB) enables coal industry to realize safe, efficient, and green resources at expense making underground mine production more complex. In mining, primary problem is eliminate logistics system bottleneck increase output. The key synergetic that capacity fully mechanized face should match raw separating g...

The effective production of high-quality anthracite has attracted increasing global attention. Based on the coal occurrence in Yongxia Mining Area and mining conditions of a coalface in Xinqiao Coal Mine, we proposed a systematic study on the technical support for the production of high-quality anthracite. Six key steps were explored, including coal falling at the coalface, transport, undergrou...

In order to address the issue of low degree of automation and huge waste of electric energy of the equipment in drilling engineering freezing station which adopts the freezing method of coal mine, we need to design an intelligent control system to control both the brine pump and double stage ammonia screw compressor. According to the actual cooling need in freezing project, this new system is a...

background:   although intramedullary nailing (imn) is an established and accepted operative treatment for femoral shaft fracture in patients younger than 60, there is a lack of data on the results of this treatment on those over 60. the purpose of this study was to determine if the outcome of imn for femoral shaft fracture in elderly patients is also acceptable. particular challenges in this g...

Miners [34, 26]. You are standing in front of two mine shafts (A and B). Flood waters are approaching. You know that ten miners are in one of the shafts, but you don’t know which (e.g., their location was determined by the result of a fair coin toss). You have enough sand bags to block one of the shafts. If the miners are in A, then blocking A saves all 10 miners (and, hence, minimizes disutili...

Rare sulphate of nickel, retgersite, was identified on the one specimen collected dump Lill shaft, Březové Hory ore district, Příbram (Czech Republic) in 1990s. The consists quartz gangue with dominant millerite and sphalerite. Retgersite forms light blue to blue-green curved fibrous microcrystalline aggregates up 2 mm size vitreous lustre, growing surface small outer vugs supergene altered gan...

The transformation of the energy sector towards an increased share renewable sources in mix requires attention area electricity storage. Renewable (photovoltaics or wind energy) are marked by intermittency production and require construction storage to adapt supply demand, providing greater stability. authors focused on verifying solution gravitational existing shafts hard coal mines Poland. is...

A typical passive magnetic bearing has been modeled and analyzed for its performance characteristics. The magnetic bearing studied in this work comprised of a Shaft, inner magnets sleeved over the shaft, and outer magnetic rings. A detailed analysis has been perform on the force exerted by a permanent magnet on the shaft nurture to restore the shaft to its equilibrium position when an eccentric...

“You can drop a mouse down a thousand-yard mine shaft; and, on arriving at the bottom, it gets a slight shock and walks away, provided that the ground is fairly soft. A rat is killed, a man is broken, a horse splashes.” ‘On being the right size’, by J. B. S. Haldane (1928). Size matters. Its effect is all pervasive, but it influences different variables in different ways: given that the volume ...