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  • Articles  (10)
  • General relativity, alternative theories of gravity  (6)
  • Brackish  (4)
  • 2015-2019  (10)
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  • 1
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    La rhodophycée Gracilaria verrucosa (Hudson) Papenfuss, du lac de Bizerte (Tunisie): variations mensuelles de la biomasse, du rendement et de la qualité de l'agar. (2016)
    Details
    Publication Date: 2021-05-19
    Description: During the year of 1999, the red seaweed Gracilaria verrucosa (Hudson) Papenfuss (Rhodophyta, Gracilariales, Gracilariaceae), has been followed monthly in Bizerte lake (in the north of Tunisia). The parameters studied are: biomass, agar-yield, gel strength, gelling and melting temperatures. The results showed that the highest average of wet biomass is recorded in June (2500 g/m super(2)) and the lowest is obtained in October (130 g/m super(2)). The highest agar-yield is obtained in April (37,92 %) ; while the lowest is recorded in September (10,67 %). High and low gel strengths are obtained in May (410g /cm super(2)) and in December (125 g :cm super(2)), respectively. Gelling temperature varies between 31 degree C and 44~ 'C, while melting temperature varies between 79 degree C and 100 degree C
    Description: Published
    Keywords: Qualité ; Agar ; Yield ; Quality ; Seaweed products ; Biomass ; Gracilaria verrucosa ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 127-136
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  • 2
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    Evaluation des potentialités quantitatives naturelles des Gracilaires (algues rouges) du lac Nord de Tunis. (2016)
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    Publication Date: 2021-05-19
    Description: L’estimation de la biomasse de la macroalgue Gracilaria dans le lac nord de Tunis a été réalisée au cours de Juin-Juillet 1996 à partir de 38 stations d’échantillonnage couvrant tous les types de recouvrement de l’espèce. Il en ressort que la biomasse en poids humide est de 191 g/m2 (28 g/m2 en poids sec) et engendre un potentiel total estimé à 508 tonnes, soit 74 tonnes en poids sec (la matière sèche représentant en moyenne 14,5 % de la matière humide). Eu égard à la quantité de Gracilaria disponible à l’état naturel, la valorisation de cette espèce au niveau de ce site pourrait demander le recours à la phycoculture.
    Description: The red seaweed Gracilaria biomass in the Tunis north lake (Tunisia) was estimated between June and July 1996 with reference to different stations. This biomass represent 191 g/m super(2) (wet weight) and 28 g/m super(2) (dry weight). so the total quantity is estimated to 508 t in wet and 74 in dry (the average of dry material represent in general 14,5 % of the humid materiel). Because of its low natural total production, the development of Gracilaria seaweed in this site need culture processing.
    Description: Published
    Keywords: Macroalgues ; Phycoculture ; Potential resources ; Aquaculture development ; Marine aquaculture ; Seaweed culture ; Coastal lagoons ; Biomass ; Seaweeds ; Gracilaria ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: 15-27
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  • 3
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    Résultats des cultures expérimentales de la rhodophycée Gracilaria verrucosa (Hudson) Papenfuss dans le lac de Bizerte, Tunisie septentrionale. (2016)
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted in Bizerte lake (Tunisia) between April and July of 1998. It concerns Gracilaria verrucosa culture with 3 techniques in order to determine the best one. After 58 days, the sand pudding method gave the best result with reference of average weight (1205 g), % of recuperation of the tuft (90 %), final density (2,7 kg/m super(2)) and specific growth rate (3,100).
    Description: Published
    Keywords: Mode de culture ; Accroisseirent du poids ; Densité de culture ; Sujet growth rate ; Density ; Experimental culture ; Seaweed culture ; Culture media ; Aquaculture techniques ; Gracilaria verrucosa ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 113-125
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  • 4
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    Potentialités en macroalgues: cartographie et biomasse de l'agarophyte Gracilaria dans le lac de Bizerte. (2016)
    Details
    Publication Date: 2021-05-19
    Description: The prospecting study of the Gracilaria in Bizerte lake (Tunisia) between the river bank and a depth of 3 m and concerning 1300ha shows that the macro seaweeds cover a surface of 348 ha and give a wet total biomass of 4775 (that is 573 t dry weight) with reference to average density of 1,7 kg/m super(2). These species are principally present as band between Menzel Abderrahman and Oued Gueniche (Tunisia)
    Description: Published
    Keywords: Macroalgues ; Fishery surveys ; Botanical resources ; Seaweed harvesting ; Biomass ; Gracilaria ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 17-34
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  • 5
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    Growth factor in f(T,T) gravity (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-12-06
    Description: Author(s): Gabriel Farrugia and Jackson Levi Said We investigate the growth factor for subhorizon modes during late times in f ( T , T ) gravity, where T is the torsion scalar and T is the trace of the stress-energy tensor. This is achieved by obtaining the modified Mészáros equation, which describes the evolution of the perturbations of the matter ener… [Phys. Rev. D 94, 124004] Published Fri Dec 02, 2016
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Cosmological bouncing solutions in extended teleparallel gravity theories (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-05-24
    Description: Author(s): Álvaro de la Cruz-Dombriz, Gabriel Farrugia, Jackson Levi Said, and Diego Sáez-Chillón Gómez In the context of extended teleparallel gravity theories with a 3 + 1 -dimensional Gauss-Bonnet analog term, we address the possibility of these theories reproducing several well-known cosmological bouncing scenarios in a four-dimensional Friedmann-Lemaître-Robertson-Walker geometry. We study which typ... [Phys. Rev. D 97, 104040] Published Wed May 23, 2018
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Gravitational waves in modified teleparallel theories (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-06-27
    Description: Author(s): Gabriel Farrugia, Jackson Levi Said, Viktor Gakis, and Emmanuel N. Saridakis We investigate the gravitational waves and their properties in various modified teleparallel theories, such as f ( T ) , f ( T , B ) , and f ( T , T G ) gravities. We perform the perturbation analysis both around a Minkowski background and in the case where a cosmological constant is present, and for clarity we use... [Phys. Rev. D 97, 124064] Published Tue Jun 26, 2018
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Stability of the flat FLRW metric in f(T) gravity (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-12-31
    Description: Author(s): Gabriel Farrugia and Jackson Levi Said In this paper, we investigate the stability of the flat Friedmann-Lemaitre-Robertson-Walker metric in f ( T ) gravity. This is achieved by analyzing the small perturbations, δ about the Hubble parameter and the matter energy density, δ m . We find that δ ∝ H ˙ / H and δ m ∝ H . Since the Hubble parameter depends … [Phys. Rev. D 94, 124054] Published Fri Dec 30, 2016
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Stability of the Kasner universe in $f(T)$ gravity (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-02-07
    Description: Author(s): Andronikos Paliathanasis, Jackson Levi Said, and John D. Barrow f ( T ) gravity theory offers an alternative context in which to consider gravitational interactions where torsion, rather than curvature, is the mechanism by which gravitation is communicated. We investigate the stability of the Kasner solution with several forms of the arbitrary Lagrangian function e... [Phys. Rev. D 97, 044008] Published Tue Feb 06, 2018
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Gravitomagnetic effects in quadratic gravity with a scalar field (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-10-08
    Description: Author(s): Andrew Finch and Jackson Levi Said The two gravitomagnetic effects which influence bodies orbiting around a gravitational source are the geodetic effect and the Lense-Thirring effect. The former describes the precession angle of the axis of a spinning gyroscope while in orbit around a nonrotating gravitational source whereas the latt… [Phys. Rev. D 94, 084010] Published Thu Oct 06, 2016
    Keywords: General relativity, alternative theories of gravity
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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