5,558 research outputs found
स्क्रोम्ब्रोइडस के विशेष प्रसंग में कालिकट की अपवाही जाल मात्स्यिकी
कृपया पूरा लेखा पढ
What we don't know about time
String theory has transformed our understanding of geometry, topology and
spacetime. Thus, for this special issue of Foundations of Physics commemorating
"Forty Years of String Theory", it seems appropriate to step back and ask what
we do not understand. As I will discuss, time remains the least understood
concept in physical theory. While we have made significant progress in
understanding space, our understanding of time has not progressed much beyond
the level of a century ago when Einstein introduced the idea of space-time as a
combined entity. Thus, I will raise a series of open questions about time, and
will review some of the progress that has been made as a roadmap for the
future.Comment: 15 pages; Essay for a special issue of Foundations of Physics
commemorating "Forty years of string theory
मान्नार की खाडी में टूटिकोरिन तट पर थेर्मोकाँल से निर्मित मत्स्यन यान और उनकी आर्थिकता
कृपया पूरा लेखा पढ
Emergence of thermocole fishing crafts and their economy along Tuticorin coast in Gulf of Mannar
In the recent past thermocole waste materials
and sheets were used in fabricating tiny fishing
boats and floats of various size and shapes
along the Tuticorin coast. Based on the
structure they are recognized as floats (poya)During the recent past few fisher folk of
Vembar made floating objects by stacking
together thermocole packing materials/wastes
and used as a fishing platform in the near shore
water
Generalized iterated wreath products of cyclic groups and rooted trees correspondence
Consider the generalized iterated wreath product where . We
prove that the irreducible representations for this class of groups are indexed
by a certain type of rooted trees. This provides a Bratteli diagram for the
generalized iterated wreath product, a simple recursion formula for the number
of irreducible representations, and a strategy to calculate the dimension of
each irreducible representation. We calculate explicitly fast Fourier
transforms (FFT) for this class of groups, giving literature's fastest FFT
upper bound estimate.Comment: 15 pages, to appear in Advances in the Mathematical Science
Palk Bay Information and Bibliography
Scientific information on Palk Bay,Tamilnadu, India is given. List of 446 scientific papers has been provided
Hydrogen Bond Dynamics Near A Micellar Surface: Origin of the Universal Slow Relaxation at Complex Aqueous Interfaces
The dynamics of hydrogen bonds among water molecules themselves and with the
polar head groups (PHG) at a micellar surface have been investigated by long
molecular dynamics simulations. The lifetime of the hydrogen bond between a PHG
and a water molecule is found to be much longer than that between any two water
molecules, and is likely to be a general feature of hydrophilic surfaces of
organized assemblies. Analyses of individual water trajectories suggest that
water molecules can remain bound to the micellar surface for more than a
hundred picosecond. The activation energy for such a transition from the bound
to a free state for the water molecules is estimated to be about 3.5kcal/mole.Comment: 12 pages. Phys. Rev. Lett. (Accepted) (2002
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