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  • 1
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    Fourier Transform Spectroscopy of the Red and Orange Band Systems of Calcium Hydride (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Calcium hydride has been the subject of many spectroscopic studies due to its astrophysical interest, beginning with its identification in solar and stellar spectra.
    Type: Pramana
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  • 2
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    A fast recursive algorithm for the discrete sine transform (1990)
    In:  IEEE Trans. on Signal Processing, Bonn, Inst. f. Theoret. Geodäsie, vol. 38, no. 11, pp. 553-556, pp. L24306, (ISBN: 0534351875, 2nd edition)
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    Publication Date: 1990
    Keywords: Transformations ; Filter-
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Seismicity and geodynamics of the low-to high-grade transition zone of peninsular India (1992)
    In:  Tectonophys., Jena, Scientific American, vol. 201, no. 2, pp. 175-186, pp. TC2014, (ISSN: 1340-4202)
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    Publication Date: 1992
    Keywords: Seismicity ; Dynamic ; Plate tectonics
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Observations of Pc5 micropulsation-related electric field oscillations in equatorial ionosphere (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A 54.95-MHz coherent backscatter radar, an ionosonde and the magnetometer located at Trivandrum in India (8.5 deg N, 77 deg E, 0.5 deg N dip angle) recorded large-amplitude ionospheric fluctuations and magnetic field fluctuations associated with a Pc5 micropulsation event, which occurred during an intense magnetic storm on 24 March 1991 (A(sub p) = 161). Simultaneous 100-n T-level fluctuations are also observed in the H-component at Brorfelde, Denmark (55.6 deg N gm) and at Narsarsuaq, Greenland (70.6 deg N gm). Our study of the above observations shows that the E-W electric field fluctuations in the E- and F-regions and the magnetic field fluctuations at Thumba are dominated by a near-sinusoidal oscillation of 10 min during 1730-1900 IST (1200-1330 UT), the amplitude of the electric field oscillation in the equatorial electrojet (EEJ) is 0.1-0.25 mV/m and it increases with height, while it is about 1.0 mV/m in the F-region, the ground-level H-component oscillation can be accounted for by the ionospheric current oscillation generated by the observed electric field oscillation in the EEJ and the H-component oscillations at Trivandrum and Brofelde are in phase with each other. The observations are interpreted in terms of a compressional cavity mode resonance in the inner magnetosphere and the assoicated ionospheric electric field penetrating from high latitudes to the magnetic equator.
    Keywords: GEOPHYSICS
    Type: Annales Geophysicae (ISSN 0992-7689); 12; 6; p. 565-573
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  • 5
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    Moisture and heat budgets of a cirrus cloud from aircraft measurements during FIRE (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: This study is based on the NCAR King Air aircraft and radiosonde observations on 31 October 1986 during the FIRE in Wisconsin over Oshkosh. Aircraft step-up and spiral descent flights are used to obtain kinematic and thermodynamic data. In the step-up maneuver, six different penetrations were made between 1528 and 1616 UTC. Each penetration was about 30 km long separated in the vertical by about 300 m. The time difference between the two spiral soundings was about 43 min. The aircraft descended at a rate of 1.5 m/s during these spiral soundings. Kinematic, cloud physical, and radiometric observations from various instruments are used to estimate the different terms in the moisture- and heat-budget equations. The results show that the advection terms, estimated using the mean longitudinal wind and vertical velocities, and radiative fluxes are important in forming budgets for the cirrus layers. Ice-crystal growth is significant in the upper layers. The maintenance of cirrus can be attributed to relatively warm and moist air advection, radiative cooling at upper levels, and moisture advection in the vertical. Turbulent heat and moisture fluxes are found to be significant in the low levels of cirrus.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Royal Meteorological Society, Quarterly Journal (ISSN 0035-9009); 119; 513,; p. 957-974.
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  • 6
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    Terrain effects on backscattering coefficients derived from multifrequency, polarimetric SAR data (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A set of multidate, multilook angle polarimetric SAR data, acquired in Pennsylvania during July 1990 was recorded to determine the effect of local incidence angle. Cosine-based and polynomial models are found to be equally good for correcting SAR data for local incidence angle effects. A modified approach, considering the correction factor as additive rather than multiplicative, gave better results. The standard error in the estimation of soil moisture improves from 8.1 to 5.8 after applying corrections to incidence angle effects.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: In: IGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vol. 1 (A93-47551 20-43); p. 86-88.
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  • 7
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    Formation of negative ions by electron impact on SiF4 and CF4 (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: First measurements of cross sections for the formation of negative ions by electron attachment to SiF4 and CF4 are reported for an electron impact energy range of 0 to 50 eV. The energies at which the various ions appear and the positions at which the ionization efficiency curves peak have been obtained and compared with previous measurements. Thermochemical data have been used to predict and identify the various channels of dissociation. Cross sections for the production of ion pairs through the process of polar dissociation have also been measured.
    Keywords: PLASMA PHYSICS
    Type: Zeitschrift fuer Physik D - Atoms, Molecules and Clusters (ISSN 0178-7683); p. 111-115.
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  • 8
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    High-resolution Fourier transform spectroscopy of the Meinel system of OH (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The infrared spectrum of the hydroxyl radical OH, between 1850 and 9000/cm has been measured with a Fourier transform spectrometer. The source, a hydrogen-ozone diffusion flame, was designed to study the excitation of rotation-vibration levels of the OH Meinel bands under conditions similar to those in the upper atmosphere which produce the nighttime OH airglow emission. Twenty-three bands were observed: nine bands in the Delta upsilon = 1 sequence, nine bands in the Delta upsilon = 2 sequence, and five bands in the Delta upsilon = 3 sequence. A global nonlinear least-squares fit of 1696 lines yielded molecular parameters with a standard deviation of 0.003/cm. Term values are computed, and transition frequencies in the Delta upsilon = 3, 4, 5, 6 sequences in the near-infrared are predicted.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 93; 1; p. 351-395
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  • 9
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    A stable procedure to calculate the transient scattering by conducting surfaces of arbitrary shape (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: In this paper, a solution procedure is presented to obtain the transient scattering by arbitrarily shaped conducting objects directly in the time-domain using the marching-on-in-time method. The late-time oscillations are eliminated by a simple stabilization procedure which involves negligible amount of extra computation. Numerical results for surface current density and far-scattered fields are given for various structures and compared with other methods.
    Keywords: NUMERICAL ANALYSIS
    Type: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 40; 6, Ju; 661-665
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  • 10
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    Transient scattering from two-dimensional dielectric cylinders of arbitrary shape (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: In this work, the problem of transient scattering by arbitrary shaped two-dimensional dielectric cylinders is solved using the marching-on-in-time (MOT) technique. The dielectric problem is approached via the surface equivalence principle. A pair of coupled integral equations are derived by enforcing the continuity of the electric and magnetic fields which are solved by using the method of moments. Numerical results are presented for two cross sections, viz. a circle and a square, and compared with inverse discrete Fourier transform (IDFT) techniques. In each case, good agreement is obtained with the IDFT solution.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 40; 9; p. 1054-1060.
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