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  • 1
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    High resolution topside in situ data of electron densities and VHF/GHz scintillations in the equatorial region (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: AD-A125353 , AFGL-TR-83-0032 , Journal of Geophysical Research; 88; Jan. 1
    Format: text
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  • 2
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    Equatorial scintillations - A review (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Scintillation observations of equatorial irregularities by techniques such as in situ, radar backscatter, airglow, and total electron content are reviewed, with an emphasis on GHz measurements. New aspects of the spread-F analysis from ionograms are mentioned, followed by a discussion of scintillation morphology, and the longitudinal control of the equatorial scintillations is emphasized. A coordinated multitechnique observation of the equatorial irregularities is described in detail, the study being divided into two parts: (1) an examination of the large field-aligned irregularity structures and their association with discrete patches of scintillation activity, and (2) an investigation of the coexistence of km-scale-irregularities with meter scales and a description of the evolution of the irregularity and scintillation spectra during the various phases of irregularity generation and decay. Unsolved problems are also reviewed, e.g., it is stated that the effects of steep spatial gradients in the electron density structures and their subsequent erosion on both CW and pulse propagation need to be evaluated both from the point of view of theory and experiments.
    Keywords: GEOPHYSICS
    Type: AD-A108218 , AFGL-TR-81-0332
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  • 3
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    Coordinated study of equatorial scintillation and in situ and radar observations of nighttime F region irregularities (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A coordinated set of Atmospheric Explorer E (AE-E) satellite in situ, VHF radar backscatter, and scintillation measurements performed during 1977 over a common ionospheric volume is used to study the relationship between the plasma depletions or bubbles, the extended 3-m irregularity structures known as plumes, and bursts of scintillation activity or patches in the nighttime equatorial F region. The implications of the observed spatial structures and the level of ambient concentration on the generation of 3-m irregularities and scintillation modeling are discussed.
    Keywords: GEOPHYSICS
    Type: AD-A093714 , AFGL-TR-80-0376 , Journal of Geophysical Research; 85; Oct. 1
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  • 4
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    F region electron density irregularity spectra near auroral acceleration and shear regions (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Two orbits of the Atmosphere Explorer D yielded data on F region electron irregularities in the high latitude ionosphere. Data were taken with a retarding potential analyzer, an ion drift meter, a low energy electron experiment and a photoelectron spectrometer. Auroral forms were simultaneously visually sighted by DMSP spacecraft. The irregularities were associated with auroral excitation and large structured flow regions. Steep spectra with one-dimensional spectral index values for wavelengths over 1 km were observed in the acceleration region. Large amplitude irregularities appeared in large structured flow regions and displayed shallow spectra, indicating the presence of large power spectral densities at scale lengths of about 100 m. It is suspected that large velocities or shears in the velocities in adjacent precipitation regions cause the F region density perturbations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 5554-556
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  • 5
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    The role of in-situ measurements in scintillation modelling (1981)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: It is shown that the conflicting equatorial scintillation observations obtained from greatly separated ground stations can be organized in the framework of a longitudinal variation of irregularity occurrence, given satellite-borne, in situ measurements of irregularity amplitude of the global F-region irregularity morphology's general features. High-inclination satellite data are used to delineate the morphological features of the polar cap by means of such a method. The lack of diurnal and magnetic control of the irregularity morphology within the low solar flux, northern winter polar cap distinguishes this region from the auroral oval regime. A polar-orbiting communication system sensitive to phase perturbations may observe large differences in the phase-to-amplitude scintillation ratio, as it traverses the auroral oval and proceeds into the polar cap, with its sun-aligned arc system.
    Keywords: GEOPHYSICS
    Type: Symposium on the Effect of the Ionosphere on Radiowave Systems; Apr 14, 1981 - Apr 16, 1981; Washington, DC
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  • 6
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    Modelling of equatorial phase and amplitude scintillations from OGO-6 and AE irregularity data (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The technique of modelling equatorial phase and amplitude scintillations from in-situ measurements of irregularity amplitude, ambient ionization density and irregularity power spectrum is outlined. The in-situ measurements do not directly provide information on irregularity layer thickness for which radar backscatter observations are utilized. The equatorial scintillation models developed from OGO-6 and AE-C in-situ measurements during the two solstices are presented. Considerable differences in the longitude variation of scintillations are predicted during the two solstices. The model estimates are in good agreement with the available ground based phase and amplitude measurements. Problems associated with the use of bottomside spread-F data for transionospheric propagation modelling at VHF/UHF are also discussed.
    Keywords: GEOPHYSICS
    Type: Low latitude aeronomical processes; May 29, 1979 - Jun 09, 1979; Bangalore; India
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  • 7
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    Scintillations associated with bottomside sinusoidal irregularities in the equatorial F region (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Multisatellite scintillation observations and spaced receiver drift measurements are presented for a category of equatorial F region plasma irregularities characterized by nearly sinusoidal waveforms in the ion number density. The observations were made at Huancayo, Peru, and the measurements at Ancon, Peru, associated with irregularities observed by the Atmospheric-Explorer-E satellite on a few nights in December 1979. Utilizing ray paths to various geostationary satellites, it was found that the irregularities grow and decay almost simultaneously in long-lived patches extending at least 1000 km in the east-west direction.
    Keywords: GEOPHYSICS
    Type: AD-A164917 , AFGL-TR-86-0039 , Journal of Geophysical Research (ISSN 0148-0227); 91; 270-276
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  • 8
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    Surimi based dried fish cake (2021)
    In:  http://aquaticcommons.org/id/eprint/16335 | 12051 | 2015-03-28 14:10:05 | 16335 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-03
    Description: Minced fish prepared from the fillets of the sciaenid fish (Lutjanus sp.) was washed with cold water (〈10 °C) three times. The washed muscle was pressed through a piece of fine cloth to a moisture content around 80%. The pressed cake (Surimi) was ground with 2.5% sodium chloride and 3% tapioca starch. The mixed material was shaped in the form of a cake and left for one hour for the gel to set. The cakes were then steamed. The cooled cakes were cut into pieces of 1 cm length x 1 cm width x 0.5 cm thick. The pieces were either dried in an electrical oven at 50°C or dried in sun to a moisture content of 11-12%. Biochemical, bacteriological and organoleptic evaluation revealed that the cakes were in very good acceptable form for 8 months. The cakes could be rehydrated by soaking in water at ambient temperature for half an hour and boiling in water for 10 minutes.
    Keywords: Biology ; processing fishery products ; minced products ; Lutjanus sp. ; sciaenid fishes
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 87-90
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  • 9
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    Antibacterial effect of the Indian squid, Loligo duvauceli (d'Orbigny), ink (2021)
    In:  http://aquaticcommons.org/id/eprint/16592 | 12051 | 2015-04-08 18:51:13 | 16592 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-07
    Description: The ink of the Indian squid Loligo duvauceli (d'Orbigny) was tested for antibacterial activity. The antibacterial effect of bacteria present in the ink gland was also tested. Only one type of bacteria was found to be present in the ink gland of squid and was identified as Photobacterium leiognathi. Among the various forms of ink extracts, the precipitated and freeze-dried ink showed more pronounced antibacterial effect against Gram-negative bacteria, Salmonella, spp. Escherichia coli, Vibrio cholerae, V. parahaemolyticus and Pseudoinonas spp., and a less pronounced effect against Gram-positive bacteria, Staphylococcus spp. and Micrococcus spp., P. leiognathi did not inhibit any of the above bacteria. The antibacterial activity was associated with the compounds of the ink.
    Keywords: Biology ; Cephalopods ; Loligo duvauceli ; Indian squids ; squid ink ; antibacterial activity ; biochemical tests
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 65-69
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  • 10
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    Magnetoelectric coupling in the Haldane spin-chain system Dy_{2}BaNiO_{5} (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-09-28
    Description: Author(s): Kiran Singh, Tathamay Basu, S. Chowki, N. Mahapotra, Kartik K. Iyer, P. L. Paulose, and E. V. Sampathkumaran We report the results of various measurements, namely magnetization, complex dielectric permittivity, and electric polarization ( P ), on Dy 2 BaNiO 5 as a function of temperature ( T ) and magnetic field ( H ), apart from heat capacity ( C ), with the primary motivation of exploring the existence of magnetoel... [Phys. Rev. B 88, 094438] Published Fri Sep 27, 2013
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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