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Browsing IIAP Publications by Title

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  • Quantitative test for concave aspheric surfaces using a Babinet compensator 
    Saxena, A. K (Optical Society of America, 1979)
    A quantitative test for the evaluation of surface figures of concave aspheric surfaces using a Babinet compen-sator is reported. A theoretical estimate of the sensitivity is 0.002X for a minimum detectable phase change of ...
  • Quantum chromodynamics (QCD) and hadronic structure 
    Basu, R; Ravindran, V (Indian Academy of Sciences, 2003-02)
    We discuss potential problems in hadronic physics. Recent developments are reviewed and possible future studies in some interesting areas which are underway are highlighted
  • Quantum correlations from local amplitudes and the resolution of the Einstein-Podolsky-Rosen nonlocality puzzle 
    Unnikrishnan, C. S (Springer, 2001-09)
    The Einstein-Podolsky-Rosen (EPR) nonlocality puzzle has been recognized as one of the most important unresolved issues in the foundational aspects of quantum mechanics. We show that the problem is more or less entirely ...
  • A quantum field theoretic description of the delayed choice experiment 
    Srikanth, R (Indian Academy of Sciences, 2001-11)
  • Quantum general relativity, torsion and uncertainty relations 
    de Sabbata, V; Sivaram, C; Borzeszkowski, H. H. V; Treder, H. J (John Wiley & Sons, Inc., 1991)
    It is shown that in gravitational theories with torsion one is led to commutation rules corresponding to Landau-Peierls type uncertainty relations.
  • The Quantum Interference Effects in the Sc II 4247 Å Line of the Second Solar Spectrum 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Ramelli, R (IOP Publishing, 2014-10-10)
    The Sc II 4247 Å line formed in the chromosphere is one of the lines well known, like the Na I D2 and Ba II D2, for its prominent triple-peak structure in Q/I and the underlying quantum interference effects governing it. ...
  • Quantum interference with angle-dependent partial frequency redistribution: solution of the polarized line transfer in the non-magnetic case 
    Supriya, H. D; Smitha, H. N; Nagendra, K. N; Ravindra, B; Sampoorna, M (Oxford University Press on behalf of the Royal Astronomical Society, 2013-02-11)
    Angle-dependent partial frequency redistribution (PRD) matrices represent the physical redistribution in the process of light scattering on atoms. For the purpose of numerical simplicity, it is a common practice in ...
  • Quantum phases of attractive bosons on a Bose-Hubbard ladder with three-body constraint 
    Singh, Manpreet; Mishra, T; Pai, Ramesh V; Das, B. P (The American Physical Society, 2014-07)
    We obtain the complete quantum phase diagram of bosons on a two-leg ladder in the presence of attractive onsite and repulsive interchain nearest-neighbor interactions by imposing the onsite three-body constraint. We find ...
  • Quantum phases of ultracold bosonic atoms in a one-dimensional optical superlattice 
    Dhar, A; Mishra, T; Pai, R. V; Das, B. P (American Physical Society, 2011-05)
    We analyze various quantum phases of ultracold bosonic atoms in a periodic one-dimensional optical superlattice. Our studies have been performed using the finite-size density-matrix renormalization group method in the ...
  • Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey 
    Mandal, A. K; Pradhan, Bikram; Surdej, Jean; Stalin, C. S; Sagar, R; Mathew, B (Indian Academy of Sciences, 2020-12)
    Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will ...
  • Quasars in Variable Mass Hypothesis 
    Das, P. K (Indian Academy of Sciences, 1997-12)
    The variable Mass Hypothesis of conformal gravitation theory of Hoyle-Narlikar is used to develop a model for the anomalous redshift quasar-galaxy associations. It is hypothesised that quasars are born in and ejected from ...
  • Quasi 9 and 30–40 days periodicities in the solar differential rotation 
    Javaraiah, J (Elsevier B.V., 2011-09-15)
    Using the daily Mt. Wilson Doppler velocity data during 1986–1994 (solar cycle 22), we studied the short-term variations of the order of a few days to a month timescales in the solar differential rotation. We represent the ...
  • Quasi-periodic oscillation of a coronal bright point 
    Samanta, T; Banerjee, D; Tian, H (IOP Publishing, 2015-06-20)
    Coronal bright points (BPs) are small-scale luminous features seen in the solar corona. Quasi-periodic brightenings are frequently observed in the BPs and are generally linked with underlying magnetic flux changes. We study ...
  • Quasi-periodic spicule-like cool jets driven by Alfvén pulses 
    Singh, B; Srivastava, A. K; Sharma, K; Mishra, S. K; Dwivedi, B. N (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We perform a 2.5D magnetohydrodynamic simulation to gain a comprehensive understanding of the formation of spicule-like cool jets caused by initial transverse velocity pulses akin to Alfven´ pulses in the solar chromosphere. ...
  • Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms 
    Sundaram, G. A. S; Subramanian, K. R (Springer, 2004-08)
    We present observational results from studying the quasi-periodicities in global solar radio flux during periods of enhanced noise storm activity, over durations of 4 hr a day (`intra-day'' variations), observed at 77.5 ...
  • Quasiadiabatic dynamics of ultracold bosonic atoms in a one-dimensional optical superlattice 
    Dhar, A; Rossini, D; Das, B. P (The American Physical Society, 2015-09)
    We study the quasiadiabatic dynamics of a one-dimensional system of ultracold bosonic atoms loaded in an optical superlattice. Focusing on a slow linear variation in time of the superlattice potential, the system is driven ...
  • Quenching of NO2 continuum by NO, H2O & CH4 
    Ghosh, K. K (Publications & Information Directorate, CSIR, 1984-10)
    The K/A ratio, where K is the quenching rate coefficient of NO2 continuum by NO2, H2O and CH4 and A is the transition probability of NO2 continuum, has been measured using flowing afterglow method. The obtained values are ...
  • Quiescence of an outburst of a low-mass young stellar object: LDN1415-IRS 
    Singh, Koshvendra; Ojha, Devendra K.; Ninan, Joe P.; Sharma, Saurabh; Ghosh, Supriyo; Ghosh, Arpan; Bhatt, B. C; Sahu, D. K (Indian Academy of Sciences, 2023-12)
    LDN1415-IRS, a low-mass young stellar object (YSO), went into an outburst between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb. LDN1415-Neb was found to have brightened by I=3.77 mag by April 2006. The ...
  • Quiet-Sun variability with the solar cycle 
    Kariyappa, R (Astronomical Society of the Pacific, 1999)
    In evaluating the contribution of various chromospheric features to total CaII K-emission flux and UV irradiance variability, the quiet-Sun is also one of the essential and important component. We have segregated the disc ...
  • R Coronae Borealis at the 2003 light minimum 
    Kameswara Rao, N; Lambert, D. L; Shetrone, M. D (Blackwell Publishing, 2006-08)
    A set of five high-resolution optical spectra of R CrB obtained in 2003 March is discussed. At the time of the first spectrum (March 8), the star was at V = 12.6, a decline of more than six magnitudes. By March 31, the ...

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