Introduction: Impact structures are unlike most geologic features because there commonly is little or no surface manifestation of their complex crater-filling stratigraphy. Further, many impact structures lie completely buried by as much as several hundred meters of sediment. Frequently, the only means of accessing tangible material from within such structures is by drilling. Of the 172 proven ...

The aim of this paper is to explore the relationship between wages, human capital and investment in financial assets with risky returns at the individual level. To explore this relationship from an international perspective, we analyse individual level data from the British Household Panel Survey, the German Socio-Economic Panel and the U.S. Panel Study of Income Dynamics. Our findings suggest ...

This paper reports a set of experiments motivated by the observation that the design of group decision processes is crucial to the success of electronic meeting room usage. Decision processes can be designed with more emphasis either on exchanging meanings (discussing issues) or exchanging artefacts (generating and structuring topics). Our problem is that, given a particular case to be discusse...

The article provides an analysis of Russian and Australian national documentation on occupational safety industrial for toxic post-blast gases. main purpose the is to present results research need a recognized document that would be appropriate all countries conducting open cut blasting. was performed with two spheres mine in mind, such as health establish standards environmental exposure harmf...

Abstract Small-scale model blasting plays an important role in understanding mechanism of rock fragmentation by and improving blast technology mining engineering. Because a specimen (or model) often needs to be placed on either ground or another material blasting, additional interface appears between the material), compared with engineering that does not have such interface. In this paper, four...

The effect of a blasting vibration from an excavating tunnel on adjacent excavated is great importance for the stability and security twin tunnels. Due to relatively small distance between face concrete lining tunnel, impact could be significant should considered in practical project. In order control scales during excavation one minimize one, research based field-blasting tests performed tunne...

In the process of tunnel excavation, blasting technology is one commonly used excavation methods. The mainly divided into smooth and presplitting blasting. blasting, in order to prevent excessive damage caused by explosive often carried out means uncoupled charging. previous studies, blast hole were placed concentrically, while actual engineering, charge exists form eccentricity. this study, LS...

This study assessed contributions of micron-scale topography on clinically relevant titanium (Ti) to differentiation of osteoprogenitor cells and osteoblasts; the interaction of this effect with 1α,25-dihydroxyvitamin D3 (1α,25(OH)2D3); and if the effects are sex-dependent. Male and female rat bone marrow cells (BMCs) were cultured on acid-etched (A, R a = 0.87 μm), grit-blasted (GB, R a = 3.90...

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...