نتایج جستجو برای: underground development
تعداد نتایج: 1428517 فیلتر نتایج به سال:
Hidden nature of underground economy makes it difficult to measure and carry out a direct study on it . Thus, most of the common measurement methods are the ones that indirectly estimate the extent of these activities and suffer from restrictive assumptions. In the past two decades, economists began to pay attention to measurement of underground economy volume and its causes and effects more t...
The feasibility of the Finite Difference Time Domain (FDTD) technique for acoustic wave created an opportunity for underground cavity detection that poses strong potential for acoustic wave spectrum application. The numerous significant advances have been attained to date, and more technological challenge awaits the optimization of an acoustic system to fill the gap between expectations and pra...
Underground music file sharing communities are online social spaces that facilitate the sharing of mostly unauthorised digital content. This paper proposes underground file sharing communities as subcultures, and explores the Roswell community from theoretical perspectives of group formation and translation from Actor-network theory (ANT) to gain a better understanding of the motivations for fi...
Pacific Northwest National Laboratory has recently opened a shallow underground laboratory intended for measurement of low-concentration levels of radioactive isotopes in samples collected from the environment. The development of a low-background liquid scintillation counter is currently underway to further augment the measurement capabilities within this underground laboratory. Liquid scintill...
the rock masses in a construction site of underground cavern are generally not continuous, due to the presence of discontinuities, such as bedding, joints, faults, and fractures. the performance of an underground cavern is principally ruled by the mechanical behaviors of the discontinuities in the vicinity of the cavern. during underground excavation, many surrounding rock failures have close r...
An advanced Monte Carlo simulation method, called Subset Simulation (SS) for the time-dependent reliability prediction for underground pipelines has been presented in this paper. The SS can provide better resolution for low failure probability level with efficient investigating of rare failure events which are commonly encountered in pipeline engineering applications. In SS method, random sampl...
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