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  • Chemistry and Materials (General)  (2)
  • Keywords. Sea water; Brine; Crystallization sequence; Simulation.  (1)
  • 2020-2021
  • 2000-2004  (3)
  • 1960-1964
  • 1
    ISSN: 1434-4475
    Keywords: Keywords. Sea water; Brine; Crystallization sequence; Simulation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Kristallisationsabfolge beim Abdampfen von Salzsolen wurde bei 25°C aufder Basis der entsprechenden Phasendiagramme computerunterstützt berechnet. Dabei wurden sowohl die auskristallisierenden festen Phasen bestimmt als auch deren Massenbilanzen ermittelt. Um quantitative Information über das Abdampfverhalten von Salzsolen zu erhalten, wurden diesen Berechnungen zwei Grenzannahmen zugrunde gelegt: i) das Fest-flüssig-Gleichgewicht stellt sich laufend ein, sodaß sich feste Phasen während des Verdampfungsprozesses teilweise oder vollständig wieder auflösen können, bzw. ii) die festen Phasen sedimentieren und trennen sich von der flüssigen Phase, sodaß keine Wiederauflösung möglich ist. Tages- bzw. jahreszeitliche Temperaturschwankungen sowie metastabile Gleichgewichte wurden nicht berücksichtigt.
    Notes: Summary.  A computer assisted calculation of the crystallization sequence of a brine is performed on the basis of the respective phase diagrams at 25°C. The nature of the solids and the mass balance are determined. The calculation gives immediate quantitative information of the brine behavior during evaporation. The calculation is performed assuming that i) the solids are always in equilibrium with the liquid, i.e. that some solid phases can be partially or completely redissolved during evaporation, or ii) the solids are separated from liquid by sedimentation and no redissolution is possible. The seasonal or day-night fluctuations of temperature and metastable equilibria have not been taken into account.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-17
    Description: The development and characterization of materials suitable for ultra long duration balloon flights has recently been the focus of the materials R&D efforts for the NASA balloon program. Although basic materials selection criteria is similar to those used for conventional balloon missions, additional considerations related to balloon design, fabrication, durability, environmental effects, and cost must also be considered. Among these, the highest impact on material selection is, related to the design shape of the balloon. Work done by independent researchers indicate that for pumpkin type balloons, the load-carrying member is the tendon rather than the structural envelope. This in turn lowers the strength requirements on the envelope material to a large extent. Several materials and material combinations were explored for both design systems. This paper will present the progress made to date in the selection and characterization of these materials and the technical challenges remaining to be overcome,
    Keywords: Chemistry and Materials (General)
    Type: COSPAR2000; Jan 01, 2000; Warsaw,; Poland
    Format: text
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  • 3
    Publication Date: 2019-08-13
    Description: This document contains a collection of experiments presented and demonstrated at the National Educators' Workshop: Update 2001 held in College Park, Maryland, October 14-17, 2001.
    Keywords: Chemistry and Materials (General)
    Type: NASA/CP-2002-211735 , NAS 1.55:211735 , L-18193 , National Educators' Workshop: Update 2001 Standard Experiments in Engineering, Materials Science, and Technology; NASA/CP-2002-211735|National Educators'' Workshop: Update 2001: Standard Experiments in Engineering, Materials Science, and Technology; Oct 14, 2001 - Oct 17, 2001; College Park, MD; United States
    Format: application/pdf
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