4,814 research outputs found

    Evolution of electromagnetic and Dirac perturbations around a black hole in Horava gravity

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    The evolution of electromagnetic and Dirac perturbations in the spacetime geometry of Kehagias-Sfetsos(KS) black hole in the deformed Horava-Lifshitz(HL) gravity is investigated and the associated quasinormal modes are evaluated using time domain integration and WKB methods. We find a considerable deviation in the nature of field evolution in HL theory from that in the Schwarzschild spacetime and QNMs region extends over a longer time in HL theory before the power-law tail decay begins. The dependence of the field evolution on the HL parameter α\alpha are studied. In the time domain picture we find that the length of QNM region increases with α\alpha. But the late time decay of field follows the same power-law tail behavior as in the case of Schwarzschild black hole.Comment: The article was fully rewritten, references added, to appear in MPL

    On the sunfish, Masturus lanceolatus landed near Ervadi, Gulf of Mannar

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    A sunfish, Masturus lanceolatus, commonly Sadaimuniyan aalasai, near Ervadi along the known as sharptail mola belonging to the family Gulf of Mannar coast on 21-05-2007. The Molidae was drifted ashore in specimen measured a total length of 840 m

    Programming Protocol-Independent Packet Processors

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    P4 is a high-level language for programming protocol-independent packet processors. P4 works in conjunction with SDN control protocols like OpenFlow. In its current form, OpenFlow explicitly specifies protocol headers on which it operates. This set has grown from 12 to 41 fields in a few years, increasing the complexity of the specification while still not providing the flexibility to add new headers. In this paper we propose P4 as a strawman proposal for how OpenFlow should evolve in the future. We have three goals: (1) Reconfigurability in the field: Programmers should be able to change the way switches process packets once they are deployed. (2) Protocol independence: Switches should not be tied to any specific network protocols. (3) Target independence: Programmers should be able to describe packet-processing functionality independently of the specifics of the underlying hardware. As an example, we describe how to use P4 to configure a switch to add a new hierarchical label

    First record of rare skate off Gulf of Mannar

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    On 20th July 2007, one single specimen of roundel skate was accidentally caught by fish trawl net operated off Gulf of Mannar at a depth of 70m and landed at Pamban-Therkuvadi. The specimen was identified as Raja texana, Chandler, 1921, belonging to the family Rajidae. The fish was a female measuring 360mm in length and weighing 760 g. It is for the first time this species was recorded from the Gulf of Mannar Sea

    Neighbor Balanced Block Designs for Two Factors

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    The concept of Neighbor Balanced Block (NBB) designs is defined for the experimental situation where the treatments are combinations of levels of two factors and only one of the factors exhibits a neighbor effect. Methods of constructing complete NBB designs for two factors in a plot that is strongly neighbor balanced for one factor are obtained. These designs are variance balanced for estimating the direct effects of contrasts pertaining to combinations of levels of both the factors. An incomplete NBB design for two factors is also presented and is found to be partially variance balanced with three associate classes
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