Coal mine waste rocks, mainly broken gangue, can be used as filling materials to backfill into goafs. Under the overburden load, body is vulnerable compressive deformation and particle breakage. With increase in mining depth, overlying strata will impose different loads on rock at loading velocities, which further affect material In this paper, an experimental scheme a device are designed study...

S ince the beginning of the Christian era, the Apuanian Alps between the provinces of Massa Carrara and Lucca in Tuscany, have been a centre for the excavation of white marble, venato and arabescato, and Cardoso stone. Marble is a metamorphic rock composed of calcium carbonate with a quartz content of less than 1%. Cardoso stone (from the name of the village of Cardoso) is a dark grey metamorph...

The fossil record of conodonts may be among the best of any group of organisms, but it is biased nonetheless. Preand syndepositional biases, including predation and scavenging of carcasses, current activity, reworking and bioturbation, cause loss, redistribution and breakage of elements. These biases may be exacerbated by the way in which rocks are collected and treated in the laboratory to ext...

The exploitation of geo-resources is dominantly done using drilling and blasting. breakage rock mass by blasting has many challenges. optimal in an underground development face/tunnel blast dependent on the relief area provided to holes. This paper discussed impact number diameter holes pattern rock. numerical simulation with varying numbers hole was carried out for this purpose. isosurface out...

Due to the opaqueness of rock and limitation detection technology, it is impossible accurately describe crack growth process determine law breakage. Based on smoothed particle hydrodynamics finite element method (SPH-FEM), a numerical model for high-speed water jet breaking was established in this work simulate fragmentation impacted by jet, study effects different angles propagation microscopi...

Abstract Rock anchors are used to stabilise large-scale infrastructure such as the foundations of high buildings or road cuts, and their failure could lead severe economic social consequences. A rock anchor can fail in one more following four modes; breakage tendon steel, tendon-grout bond failure, grout-rock mass failure. In current design, knowledge for first two modes is satisfactorily known...

Cone crushers are used in the aggregates and mining industries to crush rock material. The pressure on cone crusher liners is the key factor that influences the hydraulic pressure, power draw and liner wear. In order to dynamically analyze and calculate cone crusher performance along with liner wear, a series of experiments are performed to obtain the crushed rock material samples from a crushi...

Endothelial filopodia play key roles in guiding the tubular sprouting during angiogenesis. However, their dynamic morphological characteristics, with the associated implications in cell motility, have been subjected to limited investigations. In this work, the interaction between endothelial cells and extracellular matrix fibrils was recapitulated in vitro, where a specific focus was paid to de...

The aim of this study was to investigate the effect of fasudil on lung carcinoma-conditioned endothelial cells (LCc‑ECs). To obtain LCc-ECs, human umbilical vein endothelial cells (HUVECs) were treated with conditioned cell culture media from human A549 lung adenocarcinoma cells. The effect of fasudil on the viability of LCc-ECs was assessed using...

european corn borer, ostrinia nubilalis hb. is a polyphagous insect, recognizing world widely as the predominant pest of maize. in this research the relative resistance of eleven hybrids of maize was evaluated in a field in agricultural and natural resources research center of moghan. this experiment was conducted in three replicates in a complete randomized block design. for comparison of the ...