Numerical Simulations of a Two Component Advective Flow for The Study of the Spectral and Timing Properties of Black Holes

Two component advective flows are the most physical accretion disks which arise from theoretical consideration. Since viscosity is the determining factor, we investigate the effects of viscous stresses on accretion flows around a nonrotating black hole. As a consequence of angular momentum transfer by viscosity in an accretion flow, the angular momentum distribution is modified. We include cooling effects and found that a Keplerian disk is produced on the equatorial plane and the flow above and below remains sub Keplerian. This gives a complete picture to date, of the formation of a Two component advective flow around a black hole.Comment: 3 pages, 2 figures, 13th Marcel Grossmann Meeting Conference Proceedings, Stockholm University, Swede

Higher order two-mode and multi-mode entanglement in Raman processes

The existence of higher order entanglement in the stimulated and spontaneous Raman processes is established using the perturbative solutions of the Heisenberg equations of motion for various field modes that are obtained using the Sen-Mandal technique and a fully quantum mechanical Hamiltonian that describes the stimulated and spontaneous Raman processes. Specifically, the perturbative Sen-Mandal solutions are exploited here to show the signature of the higher order two-mode and multi-mode entanglement. In some special cases, we have also observed higher order entanglement in the partially spontaneous Raman processes. Further, it is shown that the depth of the nonclassicality indicators (parameters) can be manipulated by the specific choice of coupling constants, and it is observed that the depth of nonclassicality parameters increases with the order.Comment: 9 pages, 5 figures. arXiv admin note: text overlap with arXiv:1301.028

Intermodal entanglement in Raman processes

The operator solution of a completely quantum mechanical Hamiltonian of the Raman processes is used here to investigate the possibility of obtaining intermodal entanglement between different modes involved in the Raman processes (e.g. pump mode, Stokes mode, vibration (phonon) mode and anti-Stokes mode). Intermodal entanglement is reported between a) pump mode and anti-Stokes mode, b) pump mode and vibration (phonon) mode c) Stokes mode and vibration phonon mode, d) Stokes mode and anti-stokes mode in the stimulated Raman processes for the variation of the phase angle of complex eigenvalue $\alpha_{1}$ of pump mode $a$. Some incidents of intermodal entanglement in the spontaneous and the partially spontaneous Raman processes are also reported. Further it is shown that the specific choice of coupling constants may produce genuine entanglement among Stokes mode, anti-Stokes mode and vibration-phonon mode. It is also shown that the two mode entanglement not identified by Duan's criterion may be identified by Hillery-Zubairy criteria. It is further shown that intermodal entanglement, intermodal antibunching and intermodal squeezing are independent phenomena.Comment: 11 pages, 4 figure

Protonibea diacanthus (Lacepède, 1802): NOVA DIMENZIJA RIBOLOVA U ZAPADNOM BENGALU, INDIJA

Blackspotted Croaker (Protonibea diacanthus) is one of the most commercially important croakers which migrate along West Bengal coast during winter season. This paper deals with the importance of the species along with its market value and the cause of its popularity in West Bengal. This species is gaining prime importance among the fishermen due to the highmarket price of its swim bladder. The dried swim bladders are sold in local markets for Rs. 40,000-50,000 per kg. There is a risk factor involved as the fishermen do not get the catch at a time and, moreover, they often lose common pelagic fishes due to the usage of larger mesh nets. In spite of this risk, a shift from pelagic to demersal fishing across the northern Bay of Bengal marks an important emerging trend of winter fishing in this area.Protonibea diacanthus jedna je od gospodarski najvažnijih vrsta ribe na obali zapadnog Bengala u posljednjih nekoliko godina. Provedeno istraživanje u ovom radu bavi seispitivanjem tržišta i uzrocima popularnosti ove vrste u zapadnom Bengalu. Ova riba jako je važna za ribare zbog visoke tržišne cijene njezinog plivaćeg mjehura. Cijenaosušenih plivaćih mjehura na lokalnim tržnicama iznosi 40 000 – 50 000 indijskih rupija po kilogramu. Međutim, postoji velik rizik jer nemaju svi ribari dobar ulov u određenom vremenskom periodu i k tome često gube uobičajene pelagične ribe zbog uporabe prevelikih mreža.Unatoč riziku, postoji pomak od pelagičkog ka pridnenom ribolovu na sjeveru Bengalskog zaljeva, što pridonosi razvitku trenda zimskog ribolova u tim krajevima