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  • Man/System Technology and Life Support  (2)
  • Biomass  (1)
  • Gracilaria verrucosa
  • Seaweeds
  • 2005-2009  (3)
  • 1980-1984
  • 1
    Publication Date: 2021-05-19
    Description: A population of the brown alga Padina pavonica has been studied in the locality of Cap Zebib (North of Tunisia) between September 2000 and August 2001. Abiotic factors (temperature ,salinity , oxygen ) and biotic ones (weight, height, diameter, biomass, and fertility) were carried out . The results showed that temperature varied between 12°C (February) and 24.5 °C (July). Salinity has recorded a little variation during the year .Oxygen ranged between 4.4 mg/l( March) and 10mg/l (November).Padina pavonica changed monthly . The weight ranged between 0.39g (February) and 18.8 g (August) . Minimum and maximum height were recorded respectively in January (2.07 cm) and September (7.3 cm) . Diameter varied between 1.32 cm (December) and 8.9 cm (August) . Concerning the biomass, we have recorded the highest one in June (3925g/m2) . This value let us estimate the quantity of Padina about 20 T . The fertility of Padina ranged between 0% (February ) and 100% (July and August) . These results show that Padina pavonica grows and reproduces particularly in spring and summer.
    Description: Une étude a été réalisée sur une population naturelle de l’algue brune Padina pavonica vivant à Cap Zebib , au Nord de la Tunisie . Les paramètres suivis sont de deux types, abiotiques et biotiques. Parmi le premier type , la température de l’eau , la salinité et l’oxygène dissous , ont été enregistrés mensuellement .Parmi le second , le poids des thalles, la hauteur, le diamètre , la biomasse et la fertilité de Padina , ont été suivis pendant la même période qui a duré une année de Septembre 2000 à Août 2001 .Les résultats enregistrés ont montré que la température varie de 12 °C (Février) à 24°C (Juillet) . La salinité n’a pas beaucoup changé au cours de l’année. L’oxygène dissous est compris entre 4.4 mg/l (Mars) et10 mg/l (Novembre). Le poids a évolué entre 0.39 g (Février) et 18.8 g (Août). Les hauteurs , maximale et minimale , ont été enregistrées respectivement en Janvier (2.07 cm) et Septembre (7.3 cm).Le diamètre a varié entre 1.32 cm (Février) et 8.9 cm (Août).La biomasse maximale a été obtenue en Juin (3925 g/m²).La quantité totale de Padina a été estimée à 20T ( poids frais). La fertilité est comprise entre 0% (février) et 100% (juillet et août). Ces résultats montrent que Padina pavonica se développe et se reproduit, essentiellement au printemps et en été.Mots clés : Algue brune, Padina pavonica , poids , hauteur , diamètre, fertilité, biomasse.
    Description: INSTM
    Description: Published
    Description: Algue brune, Poids-auteur-diamètre, Padina pavonica
    Keywords: Brown algae ; Algae ; Fertility ; Biomass ; Length-weight relationships
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 309795 bytes
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-12
    Description: The Antenna Logic Controller (ALC) software controls and monitors the motion control equipment of the 4,000-metric-ton structure of the Deep Space Network 70-meter antenna. This program coordinates the control of 42 hydraulic pumps, while monitoring several interlocks for personnel and equipment safety. Remote operation of the ALC runs via the Antenna Monitor & Control (AMC) computer, which orchestrates the tracking functions of the entire antenna. This software provides a graphical user interface for local control, monitoring, and identification of faults as well as, at a high level, providing for the digital control of the axis brakes so that the servo of the AMC may control the motion of the antenna. Specific functions of the ALC also include routines for startup in cold weather, controlled shutdown for both normal and fault situations, and pump switching on failure. The increased monitoring, the ability to trend key performance characteristics, the improved fault detection and recovery, the centralization of all control at a single panel, and the simplification of the user interface have all reduced the required workforce to run 70-meter antennas. The ALC also increases the antenna availability by reducing the time required to start up the antenna, to diagnose faults, and by providing additional insight into the performance of key parameters that aid in preventive maintenance to avoid key element failure. The ALC User Display (AUD) is a graphical user interface with hierarchical display structure, which provides high-level status information to the operation of the ALC, as well as detailed information for virtually all aspects of the ALC via drill-down displays. The operational status of an item, be it a function or assembly, is shown in the higher-level display. By pressing the item on the display screen, a new screen opens to show more detail of the function/assembly. Navigation tools and the map button allow immediate access to all screens.
    Keywords: Man/System Technology and Life Support
    Type: NPO-44341 , NASA Tech Briefs, September 2007; 48-49
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-12
    Description: A document describes a 5.5-m-diameter, helium-filled balloon designed for carrying a scientific payload having a mass of 44 kg for at least six days at an altitude of about 55 km in the atmosphere of Venus. The requirement for floating at nearly constant altitude dictates the choice of a mass-efficient spherical super-pressure balloon that tracks a constant atmospheric density. Therefore, the balloon is of a conventional spherical super-pressure type, except that it is made of materials chosen to minimize solar radiant heating and withstand the corrosive sulfuric acid aerosol of the Venusian atmosphere. The shell consists of 16 gores of a multilayer composite material. The outer layer, made of polytetrafluoroethylene, protects against sulfuric acid aerosol. Next is an aluminum layer that reflects sunlight to minimize heating, followed by an aluminized polyethylene terephthalate layer that resists permeation by helium, followed by an aromatic polyester fabric that imparts strength to withstand deployment forces and steady super-pressure. A polyurethane coat on the inner surface of the fabric facilitates sealing at gore-to-gore seams. End fittings and seals, and a tether connecting the end fittings to a gondola, are all made of sulfuric-acid-resistant materials.
    Keywords: Man/System Technology and Life Support
    Type: NPO-43852 , NASA Tech Briefs, April 2007; 29
    Format: application/pdf
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