we inverse the surface gravity data to recover subsurface 3d density distribution with two strategy. in the first strategy, we assumed wide density model bound for inverting gravity data and in the second strategy, the inversion procedure have been carried out by limited bound density. wediscretize the earth model into rectangular cells of constant andunidentified density. the number of cells i...

In this paper we generalize the classical theorem of Thue about the optimal circular disc packing in the plane. We are given a family of circular discs, not necessarily of equal radii, with the property that the inflation of every disc by a factor of 2 around its center does not contain any center of another disc in the family (notice that this implies that the family of discs is a packing). We...

The annihilation rate of weakly interacting cold dark matter particles at the galactic center could be greatly enhanced by the growth of a density spike around the central supermassive black hole (SBH). Here we discuss the effects of hierarchical mergers on the central spike. Mergers between halos containing SBHs lead to the formation of SBH binaries which transfer energy to the dark matter par...

Drilling and blasting have numerous applications in the civil and mining engineering. Due to the two major components of rock masses, namely the intact rock matrix and the discontinuities, their behavior is a complicated process to be analyzed. The purpose of this work is to investigate the effects of the geomechanical and geometrical parameters of rock and discontinuities on the rock mass blas...

background: diabetes is a leading cause of cardiovascular disease (cvd). moreover, cvd accounts for primary cause of death among diabetic patients. physicians, especially in the primary care setting, have effective role in the management of cardiovascular risk factors. therefore, we aimed to compare the prevalence of modifiable cardiovascular risk factors in type 2 diabetic patients attending t...

A new heterocyclic four-membered CPSeSi cation was synthesized in its racemic form by B(C6F5)3-mediated ring-closing reaction starting from the hydrosilane precursor. The has an asymmetrically substituted silicon center, which is stabilized a selenium–silicon bond. phosphonium hydroborate and precursor were characterized single-crystal X-ray diffraction analysis NMR spectroscopy. 77Se, 31P, 29S...