Department of Physics: Recent submissions

Now showing items 41-60 of 212

    • Viscosity divergence and gelation 

      Chatterjee, Barun Kumar; Roy, Suprakash (PERGAMON-ELSEVIER SCIENCE LTD, 2005-12-01)
      A new model of gelation is presented in which the viscosity is observed to diverge without the introduction of shear elasticity when a critical concentration of suspended particles is reached. This viscosity divergence ...

    • A consistent quasiparticle picture of quark-gluon plasma and the velocity of sound 

      Ghosh, Sanjay Kumar; Mukherjee, T. K.; Raha, Sibaji (WORLD SCIENTIFIC PUBL CO PTE LTD, 2006-09-07)
      A thermodynamically consistent density dependent quark mass model has been used to study the velocity of sound in a hot quark-gluon plasma. The results are compared with the recent lattice data.

    • Colour entangled orphan quarks and dark energy from cosmic QCD phase transition 

      Banerjee, S.; Bhattacharyya, A .; Ghosh, Sanjay Kumar; Raha, Sibaji; Sinha, B.; Takasugi, E.; Toki, H. (ELSEVIER SCIENCE BV, 2006-08-07)
      No abstract available

    • Susceptibilities and speed of sound from the Polyakov-Nambu-Jona-Lasinio model 

      Ghosh, Sanjay Kumar; Mukherjee, Tamal K.; Mustafa, M. G.; Ray, Rajarshi (AMERICAN PHYSICAL SOC, 2006-06-01)
      We present the Taylor expansion coefficients of the pressure in quark number chemical potential mu(0)=mu(B)/3=mu(u)=mu(d), for the strongly interacting matter as described by the Polyakov-Nambu-Jona-Lasinio (PNJL) model ...

    • Conversion of a neutron star to a strange star: A two-step process 

      Bhattacharyya, A.; Ghosh, Sanjay Kumar; Joarder, P. S.; Mallick, R.; Raha, Sibaji (AMERICAN PHYSICAL SOC, 2006-12-01)
      The conversion of a neutron star to a strange star is studied. Such a transition may be viewed as a two-step process in which the hadronic matter first gets converted to two-flavor quark matter, which, in turn, converts ...

    • Phase formation and dielectric phase transition in Ba1-xCaxTi0.6Zr0.4O3 solid solutions 

      Rout, S. K.; Sinha, E.; Panigrahi, S.; Bera, J.; Sinha, Tripurari Prasad (PERGAMON-ELSEVIER SCIENCE LTD, 2006-11-01)
      Perovskite types Ba1-xCaxTi0.6Zr0.4O3 (with x = 0.0-0.5) ceramics have been prepared through solid state reaction route. The room temperature XRD study suggests the compositions with x = 0.0 and x = 0.1 have single phase ...

    • Dielectric study of Ba(Zn 1/3Nb 2/3)O 3 at low temperature 

      Himanshu, A. K.; Gupta, D. C.; Sinha, Tripurari Prasad (ELSEVIER, 2006-05-01)
      The dielectric study of Ba(Zn 1/3Nb 2/3)O 3 has been studied at low temperature in a frequency range 100 Hz-1 MHz and a temperature range from 145K to room temperature. An analysis of real and imaginary part of dielectric ...

    • Dielectric relaxation in perovskite BaAl1 / 2 Nb1 / 2 O3 

      Dutta, Alo; Sinha, Tripurari Prasad (PERGAMON-ELSEVIER SCIENCE LTD, 2006-07-01)
      The complex perovskite oxide barium aluminium niobate, BaAl1/2Nb1/2O3 (BAN) is synthesized by a solid-state reaction technique for the first time. The X-ray diffraction of the sample at room temperature shows a monoclinic ...

    • Analyzing powers and spin correlation coefficients for p+d elastic scattering at 135 and 200 MeV 

      Przewoski, B. V.; Meyer, H. O.; Balewski, J. T.; Daehnick, W. W.; Doskow, J.; Haeberli, W.; Ibald, R.; Lorentz, B.; Pollock, R. E.; Pancella, P. V.; Rathmann, F.; Rinckel, T.; Saha, Swapan K.; Schwartz, B.; Thörngren-Engblom, P.; Wellinghausen, A.; Whitaker, T. J.; Wise, T. (AMERICAN PHYSICAL SOC, 2006-12-01)
      The proton and deuteron analyzing powers and ten of the possible 12 spin correlation coefficients have been measured for p+d elastic scattering at proton bombarding energies of 135 and 200 MeV. The results are compared ...

    • Investigations on compton scattering: New directions 

      Chatterjee, Barun Kumar; LaJohn, L.A.; Roy, S.C. (PERGAMON-ELSEVIER SCIENCE LTD, 2006-12-01)
      Although inelastic (Compton) scattering of a photon off a free electron was well understood about 80 years ago, inelastic scattering off bound electrons remains an incompletely understood process. The availability of ...

    • Radiation detection by using superheated droplets 

      Sarkar, R.; Chatterjee, Barun Kumar; Roy, B.; Roy, S.C. (PERGAMON-ELSEVIER SCIENCE LTD, 2006-11-01)
      The superheated emulsion, a radiation detector consisting of superheated droplets dispersed in a gel or a solid matrix, has been in use for some time now. It was initially designed to detect neutrons but also has been ...

    • Quantum superarrivals: Bohr's wave-particle duality revisted 

      Ali, Md. M.; Majumdar, A.S.; Home, Dipankar (SPRINGER/PLENUM PUBLISHERS, 2006-04-01)
      The phenomenon of quantum superarrivals is manifested in the probabilities for Schrodinger wave packets scattered from perturbed potential barriers. We argue that both classical wave-like and classical particle-like ...

    • On the quantum analogue of Galileo's leaning tower experiment 

      Ali, Md. M.; Majumdar, A.S.; Home, Dipankar; Pan, A. K. (IOP PUBLISHING LTD, 2006-11-21)
      The quantum analogue of Galileo's leaning tower experiment is revisited using wave packets evolving under the gravitational potential. We first calculate the position detection probabilities for particles projected upwards ...

    • Quantum time-of-flight distribution for cold trapped atoms 

      Ali, Md. M.; Home, Dipankar; Majumdar, A.S.; Pan, A. K. (AMERICAN PHYSICAL SOC, 2007-04-01)
      The time-of-flight distribution for a cloud of cold atoms falling freely under gravity is considered. We generalize the probability current density approach to calculate the quantum arrival time distribution for the mixed ...

    • Bistability: a universal theme 

      Bose, Indrani (Indian Society of Cell Biology, 2007-01-01)
      T he concept of bistability is well-established in the study of dynamical systems [1]. The key feature of a dynamical system is that the state of the system changes as a function of time. The living cell offers several ...

    • Positive feedback, stochasticity and genetic competence 

      Karmakar, R.; Bose, Indrani (IOP PUBLISHING LTD, 2007-03-01)
      A single gene, regulating its own expression via a positive feedback loop, constitutes a common motif in gene regulatory networks and signalling cascades. Recent experiments on the development of competence in the bacterial ...

    • Stochastic model of transcription factor-regulated gene expression 

      Karmakar, R.; Bose, Indrani (IOP PUBLISHING LTD, 2006-09-01)
      We consider a stochastic model of transcription factor (TF)-regulated gene expression. The model describes two genes, gene A and gene B, which synthesize the TFs and the target gene proteins, respectively. We show through ...

    • Entangled spin clusters: Some special features 

      Tribedi, A.; Bose, Indrani (AMERICAN PHYSICAL SOC, 2006-07-01)
      In this paper, we study three specific aspects of entanglement in small spin clusters. We first study the effect of inhomogeneous exchange coupling strengths on the entanglement properties of the S= 1 2 antiferromagnetic ...

    • General relativistic effects on the conversion of nuclear to two-flavor quark matter in compact stars 

      Bhattacharyya, A.; Ghosh, Sanjay Kumar; Mallick, R.; Raha, Sibaji (AMER PHYSICAL SOC, 2007-11-19)
      We investigate the general relativistic (GR) effects on the conversion from nuclear to two-flavor quark matter in compact stars, both static as well as rotating. We find that GR effects lead to qualitative differences in ...

    • Rotating quark star in chiral colour dielectric model 

      Bhattacharyya, A.; Ghosh, Sanjay Kumar (WORLD SCIENTIFIC PUBL CO PTE LTD, 2007-05-10)
      The properties of rotating quark star are studied using the equation of state obtained from chiral colour dielectric model. The results are compared with those obtained from MIT bag model equation of state. The frequencies ...