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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Theoretical Study on the Electronic States of Formylcarbene (HC·CHO) and Triplet Ketene (H2 CCO) and the Ultraviolet Absorption Spectra Attributable to These Molecules 
    Chaudhuri, R. K; Krishnamachari, S. L. N. G (American Chemical Society, 2008-05)
    The adiabatic energies, vibrational frequencies, and geometries of the ground and excited electronic states of formylcarbene and the triplet electronic states of ketene are calculated employing the state-of-the art ab ...
  • Theoretical study on the excited states of HCN 
    Nayak, M. K; Chaudhuri, R. K; Krishnamachari, S. N. L. G (American Institute of Physics, 2005-05)
    In the flash-photolysis of oxazole, iso-oxazole, and thiozole a transient band system was observed in the region 2500–3050 Å. This band system was attributed to a meta-stable form of HCN, i.e., either HNC or triplet HCN. ...
  • Theoretical Study on the Ground and Excited States of Dicyanocarbene (C3N2) and Its Isomers: A Low-Temperature Matrix Emission Spectrum Attributable to 3-Cyano-2H-azirenylidene 
    Chaudhuri, R. K; Krishnamachari, S. L. N. G (American Chemical Society, 2007-05)
    Ab initio calculations are used to characterize the ground and low lying excited electronic states of selected dicyanocarbene (C3N2 or C(CN)2) isomers. Our calculated ground state geometries and the corresponding vibrational ...
  • Theoretical validation of potential habitability via analytical and boosted tree methods: An optimistic study on recently discovered exoplanets 
    Saha, S; Basak, S; Safonova, M; Bora, K; Agrawal, S; Sarkar, P; Murthy, J (Elsevier B.V, 2018-04)
    Seven Earth-sized planets, known as the TRAPPIST-1 system, was discovered with great fanfare in the last week of February 2017. Three of these planets are in the habitable zone of their star, making them potentially habitable ...
  • Theory of holographic plane gratings 
    Singh, M (National Institute of Science Communication And Information Resources, 1977-05)
    Theory of holographically recorded plane diffraction gratings (HRPDG) has been presented. In general HRPDG with have curved grooves with variable spacing. The self focussing property of HRPDG has been studied in detail. ...
  • A theory of Jovian shadow bursts 
    Gopalswamy, N (D. Reidel Publishing Co., 1986-06)
    The shadow events in the dynamic spectra of Jovian decametric emission are explained as the result of interaction between electron bunches responsible for S and L emissions. The relevant dispersion relation is derived for ...
  • Theory of polarized scattering in the mixed hanle-zeeman regime 
    Sampoorna, M; Nagendra, K. N; Stenflo, J. O (Astronomical Society of the Pacific, 2009-06)
    We present the theory of polarized partial frequency redistribution (PRD) in the presence of arbitrary magnetic fields. Starting from the classical theory of Bommier & Stenflo (1999) we derive the laboratory frame PRD ...
  • Thermal and temporal stability of W / B4C multilayer mirrors for space-based astronomical applications 
    Panini, S. S; Nayak, M; Gupta, Rajkumar; Pradhan, Paresh C.; Majhi, Arindam; Narendranath, S; Sreekumar, P (SPIE-Society of Photo-Optical Instrumentation Engineers, 2018-10)
    W  /  B4C multilayer (ML) mirrors with varying periodicities   (  d  )    =  1.6 to 5.4 nm are tested for rapid thermal and temporal stability, which are required for space-based x-ray telescopes for astronomy. The aging ...
  • Thermal characteristics of a classical solar telescope primary mirror 
    Banyal, R. K; Ravindra, B (Elsevier B.V., 2011-08)
    We present a detailed thermal and structural analysis of a 2 m class solar telescope mirror which is subjected to a varying heat load at an observatory site. A 3-dimensional heat transfer model of the mirror takes into ...
  • The thermal evolution of mass losing donors in AM CVn binary systems 
    Taam, R. E; Deloye, C. J; Sengupta, S (Astronomical Society of the Pacific, 2009-08)
    The thermal evolution of arbitrarily degenerate stellar models for the mass losing component in AM CVn binary systems formed through the white dwarf evolutionary channel is investigated for a range of initial orbital periods ...
  • Thermal Gravitational Waves 
    Sivaram, C; Arun, K (Bentham Open, 2011-08)
    There is a lot of current interest in sources of gravitational waves and active ongoing projects to detect such radiation, such as the LIGO project. These are long wavelength, low frequency gravitational waves. LISA would ...
  • Thermal Gravitational Waves from Primordial Black Holes 
    Sivaram, C; Arun, K (Bentham Open, 2011-08)
    Thermal gravitational waves can be generated in various sources such as, in the cores of stars, white dwarfs and neutron stars due to the fermion collisions in the dense degenerate Fermi gas [1-3]. Such high frequency ...
  • Thermal overstability of hydromagnetic surface waves 
    Joarder, P. S; Gokhale, M. H; Venkatakrishnan, P (Kluwer Academic Publishers, 1987-09)
    The authors investigate the effects of radiative heat losses and thermal conductivity on the hydromagnetic surface waves along a magnetic discontinuity in a plasma of infinite electrical conductivity. They show that the ...
  • Thermal self-energies at zero momentum 
    Nieves, Jose. F; Palash, B. Pal (The American Physical Society, 1995-05)
    In general the zero momentum limit of thermal self-energies calculated in perturbation theory depends on the order in which the time and the space components of the momentum are taken to zero. We show that this is an ...
  • Thermal structure of coronal loops as seen with Norikura coronagraph 
    Krishna Prasad, S; Singh, J; Ichimoto, K (IOP Publishing, 2013-03-10)
    The thermal structure of a coronal loop, both along and across the loop, is vital in determining the exact plasma heating mechanism. High-resolution spectroscopic observations of the off-limb corona were made using the ...
  • The thermal structure of sunspots 
    Hiremath, K. M; Akshatha, B. B (Springer, 2010)
    We use SOHO/MDI continuum images to measure the average thermal structure of bipolar spots during their initial appearance. Although the average thermal structure of penumbrae is independent of sunspot size and life span, ...
  • Thermospheric meridional neutral winds associated with equatorial midnight temperature maximum (MTM) 
    Sastri, J. H; Rao, H. N. R; Somayajulu, V. V; Chandra, H (American Geophysical Union, 1994-05)
    Coordinated measurements were made on two nights in December 1992 of thermospheric temperature with a Fabry-Perot Interferometer (FPI) at Kavalur ( dip∼ 9.5° N) and of F-layer height with ionosondes at Trivandrum ( dip∼ ...
  • Thick disk planetary nebulae 
    Baliga, J. K; Mallik, D. C. V (International Astronomical Union, 2006)
    In this work we attempt to find Planetary Nebulae(PNe) belonging to the thick disk population of the Galaxy, based on the proper motion and radial velocity data of the objects available in literature, by using a simulation ...
  • Thickness Dependence of the Optical properties of Vacuum Evaporated YF3 Thin Films 
    Satyamoorthy, R; Narayandass, Sa. K; Balasubramanian, C; Mangalaraj, D (Indian Institute of Astrophysics, Bangalore, 1991)
    Rare earth oxides and fluorides are well known for their refractory nature and chemical stability and so they find considerable application in electronic and optical devices. The present investigation deals with the optical ...
  • Three Dimensional Magnetohydrodynamic Turbulence in Solar Corona Loops 
    Sreedharan, T. D (Indian Institute of Astrophysics, Bangalore, 1995)

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