one of the most important challenges in the development of urban railways network is the effects of railway vibrations on human and adjacent structures. although various investigations into the sources of railway vibrations have been conducted, very few research works have been reported on the influences of track geometry parameters on the level of vibrations. this is addressed in this research...

Abstract Astronomical navigation was a kind of sea route orientating and steering practice the ancient seamen used to judge direction, relative position, track ships in blue water deep by observing stars, other celestial bodies, their regular occurrence sky, as one maritime piloting methods employed Chinese navigators. The comparative study ethno-archaeology revealed that representative astrono...

Abstract We use archival ALMA observations of the HCN and CO J = 1–0 transitions, in addition to radio continuum at 93 GHz, assess relation between dense gas, star formation, gas dynamics 10 nearby (ultra)luminous IR galaxies (U)LIRGs late-type galaxy centers. frame our results context turbulent gravoturbulent models formation whether HCN/CO ratio tracks gravitationally bound star-forming molec...

After more than 15 years of quiescence the Be/X-ray binary V0332+53 underwent a giant outburst in December 2004. We have investigated the timing properties of the source in correlation with its spectral states as defined by different positions in the colour-colour diagram. We have used RXTE and INTEGRAL light curves to obtain colour-colour diagrams, power spectra and phase-lag spectra. The powe...

‎In this paper we try to extend geometric concepts in the context of operator valued tensors‎. ‎To this end‎, ‎we aim to replace the field of scalars $ mathbb{R} $ by self-adjoint elements of a commutative $ C^star $-algebra‎, ‎and reach an appropriate generalization of geometrical concepts on manifolds‎. ‎First‎, ‎we put forward the concept of operator-valued tensors and extend semi-Riemannian...

The STAR experiment at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory, New York, USA, investigates novel QCD phenomena at high density and high temperature in ultra-relativistic Au+Au collisions. RHIC has a diameter of 3.8 km, and in total 1740 superconducting magnets [ 1]. The highest center-of-mass energy ( √ s=200 GeV) is about a factor 10 higher than past fixed...