a r t i c l e i n f o The purpose of this study is to analytically predict and to experimentally investigate the seismic response of adjacent filled parallel rock fractures with dissimilar properties (e.g., fracture thickness and stiffness). The time-domain recursive method is extended to predict that a P-wave propagates normally across the filled parallel fractures using the specific stiffness...

Tunnels are commonly excavated using drilling and blasting methods, the surrounding rock is greatly affected by vibration of hole blasting. To study influence number free surfaces on energy distribution attenuation law signals, on-site experiments numerical simulation were conducted. The research results indicate that higher surfaces, smaller peak velocity. longitudinal Fourier main frequency d...

Habitat structure plays an important mediating role in predator-prey interactions. However the effects are strongly dependent on regional predator pools, which can drive predation risk in habitats with very similar structure in opposite directions. In the Mediterranean Sea predation on juvenile sea urchins is commonly known to be regulated by seagrass structure. In this study we test whether th...

explosion has always been regarded as one of the most complicated engineering problems. as a result, many engineers have preferred rather simplified empirical approaches in comparison to extremely complex deterministic analyses. in this paper, however, a numerical simulation based on the combined finite/discrete element methodology is presented for analyzing the dynamic behavior of fracturing r...

Suitable pattern design of drilling and blasting is very important in open pit mines. Using explosive energy for rock fragmentation with minimum cost production one the purposes The most parameters are including diameter hole, specific charge, burden thickness suitable dimensions fragmentation. In this paper, charge calculated based on quality mass then definition maximum mines calculated. a ne...

The ÃA1 -X̃2E electronic spectrum of the CD3O radical has been investigated in detail. By using a variety of techniques, including rotational structure analysis, over 65 bands terminating on different vibronic levels of the à state have been assigned. The branching ratios for fluorescence decay vs photofragmentation of these same levels have also been determined. The detailed spectroscopic mappi...