## SEARCH

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- Chinese Academy of Sciences 36 (%)
- Saha Institute of Nuclear Physics 14 (%)
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- Kaul, S. N. 5 (%)
- Datta, Anindya 4 (%)
- Prakash, S. 4 (%)
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- Basu, Rahul 3 (%)

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- Astronomy [x] 345 (%)
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## Editorial

### Journal of Astrophysics and Astronomy (2003-03-01) 24: 1 , March 01, 2003

## Operational characteristics and power scaling of a transverse flow transversely excited CW CO2 laser

### Pramana (2003-01-01) 60: 99-107 , January 01, 2003

Transverse flow transversely excited (TFTE) CO_{2} lasers are easily scalable to multikilowatt level. The laser power can be scaled up by increasing the volumetric gas flow and discharge volume. It was observed in a TFTE CW CO_{2} laser having single row of pins as an anode and tubular cathode that the laser power was not increasing when the discharge volume and the gas volumetric flow were increased by increasing the electrode separation keeping the gas flow velocity constant. The discharge voltage too remained almost constant with the change of electrode separation at the same gas flow velocity. This necessitated revision of the scaling laws for designing this type of high power CO_{2} laser. Experimental results of laser performance for different electrode separations are discussed and the modifications in the scaling laws are presented.

## Photon production from quark gluon plasma at finite baryon density

### Pramana (2003-05-01) 60: 1079-1082 , May 01, 2003

The photon yield from a baryon-rich quark gluon plasma (QGP) at SPS energy has been estimated. In the QGP phase, rate of photon production is evaluated up to two-loop level. In the hadron phase, dominant contribution from π,*ρ*, ω mesons has been considered. The evolution of the plasma has been studied with appropriate equation of state in both QGP and hadron phase for a baryon-rich system. At SPS energy, the total photon yield is found to increase marginally in the presence of baryon density.

## Theoretical summary talk of QCD 2002

### Pramana (2003-11-01) 61: 787-792 , November 01, 2003

This is a summary of the talks on QCD, not including QCD at finite temperature or density (which are discussed elsewhere) presented at the QCD 2002 meeting held at IIT, Kanpur. I have attempted to give only an overview of the talks since the details may be found in the individual contributions.

## Cosmological models in general relativity

### Pramana (2003-12-01) 61: 1055-1063 , December 01, 2003

LRS Bianchi type-I space-time filled with perfect fluid is considered here with deceleration parameter as variable. The metric potentials*A* and*B* are functions of x as well as t. Assuming B′/B = f (x), where prime denotes differentiation with respect to x, it was found that*A = (l′/l)B* and*B = lS(t)*, where*l = f (x)* and*S* is the scale factor which is a function of t only. The value of Hubble’s constant*H*_{0} was found to be less than half for non-flat model and is equal to 1.3 for a flat model

## Simulating ultra-relativistic nuclear collisions: Screening corrections

### Pramana (2003-05-01) 60: 1121-1125 , May 01, 2003

A year ago, we presented a new approach to treat hadronic interactions or the initial stage of nuclear collisions [1,2]. It is an effective theory based on the Gribov-Regge formalism, where the internal structure of the Pomerons at high energies is governed by perturbative parton evolution, therefore the name*parton-based Gribov-Regge theory.* The main improvement compared to models used so far is the appropriate treatment of the energy sharing between the different elementary interactions in case of multiple scattering. It is clear that the above formalism is not yet complete. At high energies (RHIC, LHC), the multiple elementary interactions (Pomerons) cannot be purely parallel, they interact. So we introduce multiple Pomeron vertices into the theory.