This paper is based on the open pit to underground mining practice of Daye Iron Mine. The influence mechanism between high-steep slope and non-pillar sublevel caving method is studied by using physical model test. Firstly, engineering geological properties of the choosing typical research section is analysed and generalized. Secondly, the system of open pit to underground mining is developing a...

Nano cavities based on silicon and indium phosphide materials have been comparedin this study, considering field intensity enhancement factor. The results of FDTD based simulations declare that the Si nano-cavity improves confined optical field about 7.7 times higher than the InP based nano-cavity. The introduced dielectric nano-cavities support resonance wavelength at about λ=1.55 μm.

A vulnerability analysis of possible use in security studies is presented. The analysis of the London underground network suggests that the stations bombed on 7 July, 2005 may not have been chosen randomly. From the viewpoint of effectively disturbing the transport system, nearly the best choice was made out of roughly 3 million possible combinations for attacking three stations. By comparing t...

Designing a proper acoustical environment--indispensable to speech recognition--in long enclosures is difficult. Although there is some literature on the acoustical conditions in underground stations, there is still little information about methods that make estimation of correct reverberation conditions possible. This paper discusses the assessment of the reverberation conditions of undergroun...

Underground vehicular ad-hoc networks are indorsing wireless networks because they can realize many goals such as improving the driving safety and monitoring the emergency alerts in underground environments (i.e., road tunnels). It is necessary for vehicular nodes to recognize their positions to achieve these goals. However, Global Positioning System (GPS) devices cannot operate in underground ...

We examine the reduction in London Underground passenger journeys in response to the July 2005 bombings. Using entrance data for London Underground stations between 2001 and 2007, we incorporate demand and supply factors in a multivariate time-series regression model to estimate changes in passenger journeys between different Underground lines. We find that passenger journeys fell by an average...

Utilizing only the vertical muon intensity of the Gaisser parameterization of the muon flux at the surface and propagating this energy spectrum underground according to statistical ionization and radiative energy losses, it is possible to calculate the underground muon intensity Crouch curve. In addition, the primary spectral index of the Gaisser parameterization can be adjusted from E to E sim...

this book review presents the merits and drawbacks of engineering geology for underground works edited by gattinoni et al. and published by springer in 2014. this book summarizes most of the problems an engineer may encounter in underground design, construction and operation.this book is useful for students and professionals in engineering geology and is also referable for scholars in relevant ...

the increasing rate of urbanization and rate of population growth over the 20th century has led to various problems such as traffic congestion, air pollution, and lack of open and green spaces that have affected the cities and their citizen's life. this condition has led to increasing demands for more land use, homes, and work places, more public transport and mass transit systems and mode...

Workers of two bumblebee species, Bombus terrestris L. and B. pascuorum Scopoli, had to find the way of escape out of a test tube closed with a paper membrane stretched against its open end. Nearly all of the tested individuals solved successfully that task by tearing a hole in the membrane closing the tube. However, their escape behaviour showed significant interspecific differences. B. terres...