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  • 1
    Electronic Resource
    Electronic Resource
    Annealing kinetics of a-Si:H deposited by concentric-electrode rf glow discharge at room temperature (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1826-1831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The irreversible isothermal annealing of the as-deposited defects of hydrogenated amorphous silicon, a-Si:H, deposited at room temperature by concentric-electrode radio-frequency glow discharge is studied using dark and photoconductivity, space-charge limited current, and time-of-flight. The photoconductivity increases as a power law of the annealing time with exponent 0.8. The density of states at the Fermi level, measured by space-charge limited current, is inversely proportional to the annealing time. These results are compatible with bimolecular annealing kinetics. The dark conductivity obeys a Meyer–Nelder rule during the isothermal anneal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353167
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  • 2
    Electronic Resource
    Electronic Resource
    Antiferromagnetic coupling and magnetoresistance enhancement in Co-Re metallic superlattices (abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5878-5878 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co-Re metallic superlattices were prepared that show antiferromagnetic exchange coupling and enhanced saturation magnetoresistance for particular values of the Re spacer thickness. We report studies on films with the structure glass /150 A(ring) Re/[13 A(ring)Co/tRe]16/50 A(ring) Re, with tRe ranging from 3 to 40 A(ring). These structures were grown by magnetron sputtering in a system with a base pressure of 1×10−7 Torr with deposition rates of 0.3 and 0.4 A(ring)/s for Co and Re, respectively. x-ray diffractograms indicate the structure to be highly textured with the c axis perpendicular to the sample plane. The superlattice structure was obtained from high-angle θ-2θ scans. First-, second-, and third-order satellites are observed on both sides of the central [002] peak. Periodicity and bilayer composition are obtained from comparison of the data with a theoretical calculation of the x-ray diffractogram. Thickness calibration was confirmed by Rutherford backscattering and profilometer data. In-plane magnetization and magnetoresistance data (Δρ/ρ) indicate that stronger antiferromagnetic coupling and highest Δρ/ρ occur for tRe≈6 A(ring). The saturation field (Hs) needed to align contiguous antiferromagnetically coupled Co layers is about 1 T. This corresponds to an exchange coupling between the Co layer J≈−1 erg/cm2. (Δρ/ρ) reaches 2% in samples deposited at 170 °C. This data confirms results obtained by Parkin et al.1 in Co-Ru and Co-Cr superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350116
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  • 3
    Electronic Resource
    Electronic Resource
    Improvement of thermal stability and magnetoresistance recovery of Tb25Co75 biased spin-valve heads : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4903-4905 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal stability of TbCo exchange biased spin valve sensors has been extended to 230 °C, by using a Co pinned layer rather than NiFe. Magnetoresistance (MR) remains essentially stable up to annealing temperatures TA of 230 °C and degrades to 1% at TA=240 °C. Providing TA does not exceed 230 °C, any loss in the MR signal can be fully recovered by applying a field perpendicular to the film plane. This improved thermal stability allows processing at higher temperatures. The unidirectional exchange in the TbCo/Co interface becomes uniaxial for TA〉100 °C. Even though the unidirectional character was not recovered by any field/anneal treatment, uniaxial anisotropy above 120 Oe is maintained for TA=260 °C. Devices were fabricated using a process with a maximum temperature of 180 °C. No MR loss is found during process in test structures at wafer level. A prototype 10-μm-track width spin valve tape head for QIC applications gave a maximum output of 2.3 mVpp at 20 kfci. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364815
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  • 4
    Electronic Resource
    Electronic Resource
    Thulium barium copper oxide: A 90-K superconductor with a potential 1-MG upper critical field (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 371-373 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Upper critical magnetic fields Hc2(T) have been measured resistively for the high-temperature (Tc(approximately-greater-than)90 K) superconductors TmBa2Cu3O9−δ and YBa2Cu3O9−δ in applied magnetic fields H up to 9 T. If H at the resistive midpoint is defined as Hc2, then the upper critical field slopes (dHc2/dT)Tc at the superconducting transition temperatures Tc are respectively −2.8 and −1.1 T/K. The Tm-specimen initial slope is apparently the highest yet reported for 90 K superconductors. Extrapolations from this slope, based on standard, three-dimensional, dirty-limit Werthamer, Helfand, Hohenberg, and Maki theory, yield (1) zero-temperature upper critical fields Hc2(T=0)=99–175 T, where the range is determined by the degree of paramagnetic limitation; (2) Hc2(T=77 K)≈36 T, the upper critical field at the boiling point of liquid nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98445
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  • 5
    Electronic Resource
    Electronic Resource
    The small tight aspect ratio tokamak experiment (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2481-2484 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-aspect-ratio tokamaks offer both the economic advantage of smaller size and a number of physics advantages which are not available at conventional aspect ratio. The Small Tight Aspect Ratio Tokamak (START) [Fusion Technology 1990, edited by B. E. Keen, M. Huguet, and R. Hemsworth (North-Holland, Amsterdam, 1991), Vol. 1, p. 353] was conceived as a first substantial test of tokamak plasma behavior at low aspect ratio. It has achieved plasma currents up to 200 kA, peak densities of ∼2×1020 m−3 and central electron temperatures of ∼500 eV at an aspect ratio of 1.3–1.5. Central beta values of ∼13% have been measured and the volume-averaged beta 〈β〉 can approach the Troyon limit. Plasmas are naturally elongated (κ(approximately-less-than)2.0) and are vertically stable without feedback control. Major disruptions have not been observed at low aspect ratios (A≤2.0).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860732
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  • 6
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    Lista anotada de los peces del orden Anguilliformes conocidos de la costa Colombo-Venezolana, incluyendo dos nuevos registros para el Caribe colombiano (2010)
    Santa Marta (Colombia), INVEMAR
    Details
    Publication Date: 2021-05-19
    Description: Se lista un total de 81 especies de peces del orden Anguilliformes conocidas de la costa norte colombo-venezolana, 66 de ellas de la plataforma continental. Se destacan los registros de Anguilla rostrata (Lesueur) y Echiophis punctifer(Kaup), que son nuevos para el Caribe colombiano.
    Description: A total of 81 species of eels are known from the north coast of Colombia and Venezuela; 66 of them are continental shelf inhabitants. Anguilla rostrata (Lesueur) and Echiophis punctifer (Kaup) are new records for the Colombian Caribbean.
    Description: Published
    Keywords: Marine fisheries ; Ichthyology ; Outer continental shelf ; Ichthyology ; Check lists ; Marine fisheries ; New records
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 7
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    Hallazgo del pargo Cunaro Rhomboplites aurorubens (Cuvier) (Pisces: Lutjanidae) en un arrecife coralino somero (2011)
    Santa Marta (Colombia), INVEMAR
    Details
    Publication Date: 2021-05-19
    Description: Varios individuos del pargo cunaro Rhomboplites aurorubens fueron observados formando cardúmenes heteroespecíficos entre 10 y 20 m de profundidad en un arrecife coralino en Isla Tesoro (Archipiélago del Rosario, Caribe colombiano). Uno de esos ejemplares fue colectado y examinados sus caracteres meristicos y morformétricos, así como su contenido estomacal y madurez sexual. Se compara con la literatura existente sobre la biología y ecología de este pargo para tratar de explicar su presencia en esas condiciones.
    Description: Several individuals of the vermilion snapper Rhomboplites aurorubens were observed swimming in hetero specific schools between 10 and 20 m depth in a coral reef at Isla Tesoro (Archipiélago del Rosario, Colombian Caribbean). One of those specimens was collected and its meristic and morphometric characters examined, as well as its stomach content and sexual maturity. A comparison with the literature on the biology and ecology of this snapper is made in an attempt to explain its presence on those conditions.
    Description: Published
    Description: Reefs Fishes,
    Keywords: Fish ; Fish ; Stomach content
    Repository Name: AquaDocs
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  • 8
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    Una revisión de las fichas de identificación de la FAO para peces marinos del Atlántico Centro-Occidental, incluyendo nuevos registros para el caribe colombiano (2011)
    Santa Marta (Colombia), INVEMAR
    Details
    Publication Date: 2021-05-19
    Description: Se efectúa una revisión de los cinco volúmenes de la FAO sobre peces comerciales del Atlántico centro-occidental, confirmándose la presencia en el sur del Caribe de 39 especies que no son registradas de esta zona o cuyo rango de distribución no incluye ciertas áreas donde han sido encontradas. Seis de éstas son citadas por primera vez para el Caribe colombiano.
    Description: FAG's five volumcs on the commercial fishes of the western central Atlantic are reviewed. The existence of 39 species not reported from certain areas of the southern Caribbean is confirmed in this paper. Six of these are reported for the first time from the Colombian Caribbean.
    Description: Published
    Keywords: Marine fisheries ; Marine fisheries ; New records
    Repository Name: AquaDocs
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  • 9
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    Nuevos registros de peces arrecifales para el Caribe colombiano (2011)
    Santa Marta (Colombia), INVEMAR
    Details
    Publication Date: 2021-05-19
    Description: Se describen 20 especies de peces colectados en áreas arrecifales de la costa none de Colombia, de las cuales 19 constituyen primeros registros para este sector del Caribe. Se incluye información sobre aspectos biológicos y ecológicos de las especies.
    Description: 20 species of reef fishes collected in coastal waters of the Colombian Caribbean are described, 19 of which are reponed for thefirst timefor this region. Biológica! and ecological information on these species is given as well.
    Description: Published
    Keywords: Ecology ; Ichthyology ; Marine fish ; New records ; Ichthyology ; Ecology
    Repository Name: AquaDocs
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  • 10
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    Peces de las Islas del Rosario y de San Bernardo (Colombia) II. Tres nuevos registros para el Caribe Sur y 16 mas para la Costa Norte continental colombiana (2011)
    Santa Marta (Colombia), INVEMAR
    Details
    Publication Date: 2021-05-19
    Description: Se describen 19 especies de peces colectadas en los archipiélagos coralinos de las islas del Rosario y de San Bernardo, las cuales son nuevos registros para el Caribe continental colombiano. Tres de esas especies (Ichthyapus ophioneus, Calamopteryx goslinei y Apogon leptocaulus) no habían sido colectadas antes en el Caribe sur, por lo que estos récords son nuevos para este sector del Mar de las Antillas. Se incluye información sobre aspectos biológicos y ecológicos de las especies.
    Description: 19 species of fishes coliected in the coralline archipelagos of Islas de) Rosario and San Bernardo, which are reponed for the first time for the Colombian continental Car¡bbean, are described. Three of those species (Ichtyapus ophioncus, Calamopteryx goslmei and Apogon leptocaulus) had not been collected before in the southern Caribbean, being therefore new records for this section of the Sea. Biological and ecological information about the 19 species is given as well.
    Description: Published
    Keywords: Fish ; Ecology ; Biology ; Fish ; New records ; Biology ; Ecology
    Repository Name: AquaDocs
    Type: Journal Contribution
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