Department of Physics: Recent submissions

Now showing items 21-40 of 212

    • Reaction-diffusion processes on random and scale-free networks 

      Banerjee, Subhasis; Mallick, S.B.; Bose, Indrani (WORLD SCIENTIFIC PUBL CO PTE LTD, 2004-10-01)
      We study the discrete Gierer-Meinhardt model of reaction-diffusion on three different types of networks: regular, random and scale-free. The model dynamics lead to the formation of stationary Turing patterns in the steady ...

    • Characterization of some commercial polymers for the detection of massive cosmic ray particles 

      Basu, Basudhara; Mazumdar, A.; Raha, Sibaji; Saha, S.; Saha, Swapan K.; Syam, D. (INDIAN ASSOC CULTIVATION SCIENCE, 2005-03-01)
      A particular brand (CENTURY de'Smat, India) of overhead projector (OHP) film has been exposed to α-particle and fission fragments from 252Cf natural source in order to investigate its detection efficiency and charge ...

    • Cosmological dark energy from the cosmic QCD phase transition and colour entanglement 

      Banerjee, S.; Bhattacharyya, A.; Ghosh, Sanjay Kumar; Ilgenfritz, E. M.; Raha, Sibaji; Sinha, B.; Takasugi, E.; Toki, H. (ELSEVIER SCIENCE BV, 2005-03-31)
      Recent astrophysical observations indicate that the universe is composed of a large amount of dark energy (DE) responsible for an accelerated expansion of the universe, along with a sizeable amount of cold dark matter ...

    • Rotating twin stars and signature of quark-hadron phase transition 

      Bhattacharyya, A.; Ghosh, Sanjay Kumar; Hanauske, M.; Raha, Sibaji (AMERICAN PHYSICAL SOC, 2005-04-01)
      The quark-hadron phase transition in a rotating compact star has been studied. The NLZ (nonlinear consistent zero point energy) model has been used for the hadronic sector and the MIT bag model has been used for the quark ...

    • Role of in-medium hadrons in photon-nucleus reactions: Shadowing and dilepton spectrum 

      Alam, J. E.; Ghosh, Sanjay Kumar; Roy, P.; Sarkar, S. (IOP PUBLISHING LTD, 2004-12-01)
      We study the effect of in-medium hadronic properties in photon-nucleus interactions in the context of shadowing as well as the dilepton spectrum for incident photon energies in the range 1.1-3 GeV. A reasonable agreement ...

    • Size distribution of drops in superheated drop detectors 

      Sarkar, R.; Chatterjee, Barun Kumar; Roy, Biva; Roy, Suprakash C. (PERGAMON-ELSEVIER SCIENCE LTD, 2004-10-01)
      [No abstract available]

    • Dielectric relaxation in SrFe 1/2Nb 1/2O 3 

      Saha, S.; Sinha, Tripurari Prasad (American Institute of Physics, 2006)
      The strontium iron niobate Sr Fe12 Nb12 O3 ceramic is synthesized by a solid-state reaction technique. The x-ray diffraction of the sample at room temperature shows a monoclinic phase. The dielectric permittivity and the ...

    • Phase transition in Ph[(Mg3/4Cu1/4) 1/3Nb2/3]O3 ceramic 

      Kumar, A.; Prasad, K.; Choudhary, S. N.; Sinha, Tripurari Prasad (NATL INST SCIENCE COMMUNICATION, 2005-12-01)
      Single phase perovskite-type cubic ceramics of Pb[(M3/4Cu1/4)(1/3)Nb-2/3]O-3 (PMCN) were synthesized by high temperature double step solid state reaction technique. Dielectric studies show relaxor behaviour with diffuse ...

    • Study of impedance spectroscopy conducting polymer prepared with the use of water soluble support polymer 

      Ray, D. K.; Himanshu, A.K.; Sinha, Tripurari Prasad (NATL INST SCIENCE COMMUNICATION, 2005-10-01)
      The intrinsically conducting polymer (ICP), polyaniline (PANI) is synthesized by chemical oxidative polymerization process with the help of water soluble support polymer poly-vinyl alcohol (PVA). The field dependence of ...

    • Electrical behaviour of 0.80Pb[(Mg,Zn)1/3Ta2/3]O 3-0.20PbTiO3 relaxor 

      Prasad, S.; Prasad, K.; Choudhary, S. N.; Sinha, Tripurari Prasad (ELSEVIER SCIENCE BV, 2005-07-15)
      Polycrystalline 0.80Pb[(Mg2/3Zn1/3)(1/3)Ta-2/3]O-3-0.20PbTiO(3) (PMZT-PT) having a tetragonal perovskite type structure was prepared by the high temperature solid-state reaction method. Dielectric studies showed the relaxor ...

    • Ac conductivity of conducting polymer prepared with the use of water soluble support polymer 

      Himanshu, A. K.; Ray, D.K.; Sinha, Tripurari Prasad (IACS, 2005-09)
      The intrinsically conducting polymer, polyaniline (PANI) is synthesized by chemical oxidative polymerization process with the help of water soluble support polymer poly-vinyl alcohol (PVA). The field dependence of the ...

    • Characterization of a polymer as a heavy ion detector 

      Basu, B.; Fischer, B.; Mazumdar, A.; Raha, Sibaji; Saha, S.; Saha, Swapan K.; Syam, D. (TATA INST FUNDAMENTAL RESEARCH, 2005)
      A particular brand of polymer, commonly used as overhead projector transparencies, has been used as a solid state nuclear track detector with Z/beta > 35. From the infra-red transmission spectrum by FTIR Spectrophotometer, ...

    • A highly unusual cosmic ray event at mountain altitude 

      Basu, B.; Biswas, S.; Dey, S.; Mazumdar, A.; Raha, Sibaji; Saha, Swapan K. (TATA INST FUNDAMENTAL RESEARCH, 2005)
      Search of rare massive particles in cosmic rays became an active field of research for several years. A recent theoretical study suggested the possible existence of strangelets in cosmic rays even at the mountain altitude. ...

    • A highly unusual cosmic ray event at mountain altitude 

      Basu, B.; Biswas, S.; Dey, S.; Mazumdar, A.; Raha, Sibaji; Saha, Swapan K. (TATA INST FUNDAMENTAL RESEARCH, 2005)
      Search of rare massive particles in cosmic rays became an active field of research for several years. A recent theoretical study suggested the possible existence of strangelets in cosmic rays even at the mountain altitude. ...

    • Radiation from mini bang 

      Ghosh, Sanjay Kumar (CURRENT SCIENCE ASSN, 2005-11-10)
      [No abstract available]

    • Strangeness, cosmological cold dark matter and dark energy 

      Raha, Sibaji; Banerjee, S.; Bhattacharyya, A.; Ghosh, Sanjay Kumar; Ilgenfritz, E. M.; Sinha, B.; Takasugi, E.; Toki, H. (IOP PUBLISHING LTD, 2005-06-01)
      It is now believed that the universe is composed of a small amount of the normal luminous matter, a substantial amount of matter (cold dark matter (CDM)) which is non-luminous and a large amount of smooth energy (dark ...

    • QCD phase transition in rotating neutron star, neutrino beaming and gamma-ray bursters 

      Bhattacharyya, A.; Ghosh, Sanjay Kumar; Raha, Sibaji (ELSEVIER SCIENCE BV, 2006-04-13)
      We have studied the emission of neutrinos from a rotating hybrid star. We find that the emission is predominantly confined to a very small angle, provided the core of the star is in a mixed phase of quarks and hadrons and ...

    • Observability of the arrival time distribution using spin-rotator as a quantum clock 

      Pan, Alok Kumar; Home, Dipankar (ELSEVIER SCIENCE BV, 2006-04-03)
      An experimentally realizable scheme is formulated which can test any postulated quantum mechanical approach for calculating the arrival time distribution. This is specifically illustrated by using the modulus of the ...

    • Gene copy number and cell cycle arrest 

      Ghosh, B.; Bose, Indrani (IOP PUBLISHING LTD, 2006-03-01)
      The cell cycle is an orderly sequence of events which ultimately lead to the division of a single cell into two daughter cells. In the case of DNA damage by radiation or chemicals, the damage checkpoints in the G1 and G2 ...

    • Thermal entanglement properties of small spin clusters 

      Bose, Indrani; Tribedi, Amit (AMER PHYSICAL SOC, 2005-08-01)
      Exchange interactions in spin systems can give rise to quantum entanglement in the ground and thermal states of the systems. We consider a spin tetramer, with spins of magnitude 1 2, in which the spins interact via ...