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  • 1
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    Évaluation des ressources benthiques exploitées par les pêcheurs du golfe de Gabes. (2016)
    Details
    Publication Date: 2021-05-19
    Description: En vue de realiser une premiere evaluation du stock des especes halieutiques benthiques exploitees dans le golfe de Gabes, des donnees de production et d'effort de peche ont ete recueillies et analysees. Ces donnees s'etendant sur une periode de 9 annees (1980-1988) concernant les differents types de flottilles operant dans cette region. De nombreuses correlations ont ete testees afin de selectionner l'unite d'effort adequate a employer dans la presente etude. L'ajustement des modeles synthetiques (SCHAEFER et FOX) aux donnees de production et d'effort a montre que la situation d'exploitation optimale est depasee, depuis 1988, d'environ 20 p. 100.
    Description: In order to realize a first assessment of exploited stock of benthic species in the gulf of Gabes, data on production and fishing effort have been collected and analysed. These data cover a period of 9 years (1980-1988) for differents types of the fleets operating in the region. A number of correlations were tested in order to select the adequate fishing effort unit to use in this evaluation. The ajustment of synthetic models (Schaefer and Fox) to the data on production and fishing effort unit emonstrated that optimal exploitation has been passed since 1988 by 20%
    Description: Published
    Keywords: Stock benthique ; Marine fisheries ; Overexploitation ; Stock assessment ; Statistical analysis ; Fishing effort ; Fishery resources ; Benthos ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 23-38
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  • 2
    Electronic Resource
    Electronic Resource
    Strain effects on superconducting properties in Nb3Al multifilamentary wires (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4445-4447 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Critical temperatures Tc and critical currents Ic under uniaxial tensile loading have been studied on multifilamentary Nb3Al wires fabricated by a newly developed composite diffusion process. Both Tc and Ic are monotonically decreased with applied strain, showing reversible behavior up to fracture strains of the wires at about 1.3%. These characteristics may be attributed to the composite wire structure, namely to the small difference in thermal contraction between the niobium matrix and the Nb3Al filaments, as well as to the extremely small sizes of the Nb3Al filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343286
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Enhanced high-field current carrying capacities and pinning behavior of NbTi-based superconducting alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4415-4420 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-field critical current densities Jc and pinning behavior are discussed for Nb-63a/oTi, Nb-61.7a/oTi-3a/oHf, and Nb-64.7a/oTi-7.2a/oTa superconducting alloys. Jc properties for 8–12 T in these alloy superconductors under superfluid helium environments can be even superior to those in Nb3Sn at 4.2 K, when they are heavily cold-worked after final heat treatments. A temperature scaling law of the flux pinning force Fp is found to hold for these alloys in the form of FP=K [Bc2(T)]nbp(1−b)q, where Bc2 is the upper critical field and b≡B/Bc2. The peak reduced field, bm, in the Fp−b curve depends upon how the alloys have been processed. The origins of n, p, and q are discussed in terms of the processing condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334564
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  • 4
    Electronic Resource
    Electronic Resource
    High-power and high-speed 1.3 μm V-grooved inner-stripe lasers with new semi-insulating current confinement structures on p-InP substrates (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 723-725 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A significant improvement in the maximum output power of a 1.3 μm GaInAsP/InP laser with a semi-insulating current confinement structure is reported. The improvement has been achieved by interposing an n-type InP layer between a p-InP substrate and an Fe-doped InP layer. A maximum cw output power of 180 mW and a modulation bandwidth of 8.5 GHz have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101786
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  • 5
    Electronic Resource
    Electronic Resource
    High-power and high-speed semi-insulating blocked V-grooved inner-stripe lasers at 1.3 μm wavelength fabricated on p-InP substrates (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1077-1079 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A maximum cw power of 90 mW at 25 °C was obtained for a GaInAsP/InP laser with a semi-insulating InP current blocking layer grown by metalorganic vapor phase epitaxy on a p-type InP substrate, a 700-μm-long cavity, and an antireflection coating on the front facet. The 3 dB bandwidth was in excess of 6 GHz with a low parasitic capacitance of 15 pF despite the long cavity. The semi-insulating layer with the resistivity of 5×107 Ω cm was formed by doping only Fe. The current blocking characteristics of the blocking layer with the same configuration as the lasers were examined under various temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100762
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  • 6
    Electronic Resource
    Electronic Resource
    Giant magnetocaloric effect of MnAs1−xSbx (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3302-3304 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A giant magnetocaloric effect was found in MnAs, which undergoes a first-order ferromagnetic to paramagnetic transition at 318 K. The magnetic entropy change caused by a magnetic field of 5 T is as large as 30 J/K kg at the maximum value, which exceeds that of conventional magnetic refrigerant materials by a factor of 2–4. The adiabatic temperature change reaches 13 K in a field change of 5 T. The substitution of 10% Sb for As reduces the thermal hysteresis and lowers the Curie temperature to 280 K, while the giant magnetocaloric properties are retained. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1419048
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  • 7
    Electronic Resource
    Electronic Resource
    Strain effects in Nb3Al multifilamentary conductors prepared by phase transformation from bcc supersaturated-solid solution (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 122-124 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strain effects on critical current densities have been examined for conductors containing nearly stoichiometric Nb3Al filaments with fine grains. The Nb3Al phase in these multifilamentary conductors are prepared by phase transformation from supersaturated Nb(Al) bcc solid solution and show high-field critical current densities much larger than those for conventionally prepared Nb3Al conductors, where the Nb3Al phase is known to be off-stoichiometric. The degradation of critical current densities with −0.7% intrinsic strain is ca. 20% at 12 T, comparable with those for conventional Nb3Al conductors of high strain tolerance. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119447
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  • 8
    Electronic Resource
    Electronic Resource
    HgCdTe and CdTe(1¯ 1¯ 3¯)B growth on Si(112)5° off by molecular beam epitaxy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2876-2878 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CdTe(1¯ 1¯ 3¯)B epilayers were grown on Si substrates oriented (112)5° off toward the [1¯ 1¯ 1] direction by molecular beam epitaxy (MBE). A Zn irradiation process was developed in order to obtain a (1¯ 1¯ 3¯)B face. HgCdTe(1¯ 1¯ 3¯)B epilayers were grown on 20 μm-thick CdTe/Si(112) 5° off, and characterized. These layers have double-crystal x-ray rocking curves with full width at half-maximum as low as 64 arc s, and etch pit densities of 4.4×106 cm−2 and 2.6×105 cm−2 for as-grown and thermal-cycle annealed films, respectively. Photodiodes were also fabricated to demonstrate the capability of large-area MBE-HgCdTe/Si focal-plane arrays. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117348
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of thin HgTe layers on dislocations in HgCdTe layers on Si substrates (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 677-678 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found the effects of HgTe layers on dislocations of (111)B HgCdTe layers grown on Si substrates by metalorganic vapor phase epitaxy. The dislocations in HgCdTe layers were reduced by inserting thin HgTe layers between HgCdTe and CdTe buffer layers. Using this method, the dislocation density of 2.3×106 cm−2 was obtained, which is less than quarter that of HgCdTe layers without HgTe. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117803
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  • 10
    Electronic Resource
    Electronic Resource
    Development of high-strength, high-conductivity Cu–Ag alloys for high-field pulsed magnet use (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2965-2967 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A wire-conductor fabrication method has been developed for Cu–Ag alloys containing 2–60 at. % Ag where high strength and high conductivity conductors are obtained by cold working combined with intermediate heat treatment. The intermediate heat treatment is repeated 3–4 times at 350–450 °C for 1–2 h at appropriate stages of reduction of area. The optimized Cu-16 at. % Ag alloy wire with 99% reduction of area showed a tensile strength of 1000 MPa and an electrical conductivity of 80% IACS at room temperature. This suggests that the wires fabricated may be very promising for high-field pulsed magnet use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105813
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