To study on the characteristics of the vibration signals of coal and stone hitting the armor plate during caving, a hybrid algorithm based on first order forward difference and wavelet transform modulusmaxima method is presented which can be used in the longwall top coal face. First, in order to reduce the noise interference, the pre-processing of the vibration signals is done by the first orde...

Abstract In the process of longwall top coal caving, selection caving interval along advancing direction working face has an important effect on recovery. To explore a realistic face, panel 8202 in Tongxin Coal Mine is used as example, and 30 numerical simulation models are established by using Continuum-based Distinct Element Method software to study recovery with 4.0 m, 8.0 12.0 16.0 20.0 m 2...

Short-term memory and working memory are two distinct concepts that have been measured in simple and complex span tasks respectively. A new span task was designed to manipulate a chunking factor while using a procedure similar to simple span tasks. This span task allowed studying the interaction between storage and processing in working memory, when processing is fully dedicated to optimizing s...

There are various criteria that need to be examined alongside each other when designing a longwall mining system. Challenges such as determination of the supported roof width, support system design, caving height determination, lateral or chain pillar size determination, and optimum support design for the main gate and tail gate roadways have to be tackled for this aim. Three-dimensional analys...

In recent years, the construction of a CFST arch bridge has developed rapidly; however, as kind structural system dominated by compression, with increase material strength and span, stability main become more important. this paper, finite element method is used to analyze hanger force long-span bridge. Combined Shenzhen Rainbow Bridge project, axial hanger, internal force, are studied. establis...