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  • Chemistry  (2)
  • quality of life  (2)
  • Category rating  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Quality of life research 1 (1992), S. 267-272 
    ISSN: 1573-2649
    Keywords: Assessment ; health ; psychology ; quality of life
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Current quality of life measuring tools are suited for economic decision making, not to investigate causal processes which lead to patients making evaluations of their lives. An alternative approach is presented based on research into positive versus negative life-satisfaction. Quality of life is a causal sequence of psychological states where perceived symptoms cause problems and the problems and symptoms cause evaluations, and where the causal sequence is a complex interaction between morbidity and psychological factors. Different types of medical intervention affect different stages in the causal sequence and so different types of quality of life instrument are needed for different kinds of medical research.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-2649
    Keywords: Category rating ; global scales ; measurement ; quality of life ; visual analogue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We constructed a new type of global quality of life (QOL) scale deriving from the Borg symptom scales and compared four versions of this new type of scale (H scale) with four category rating (CR) scales and four visual analogue (VA) scales. Mean self-ratings and mean scenario ratings on different scales showed small but significant differences, and intercorrelations were higher amongst the H scales than amongst the CR or VA scales. H scales were on average most preferred (by undergraduates and elderly subjects) followed by CR and lastly VA scales in terms of ease of use and perceived accuracy of representation. We investigated the preferred polarity of the scales: subjects preferred ‘Perfect quality of life’ to be indicated by 20 or 100 (with slight preference for the latter) rather than 0. The H scales have eight additional quantifiers between the end labels and there was good agreement about the perceived magnitude of these quantitiers.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 139-144 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In the smelting of aluminium, HF fumes are produced that are subsequently trapped by absorption onto alumina. The factors that affect the adsorption capacity of alumina have been studied previously and are well established, but the mechanism by which HF adsorbs onto the alumina surface is not well understood.In this study, x-ray photoelectron spectroscopy (XPS) was used to investigate the nature of the surface adsorption of HF on alumina. XPS is particularly well suited to the study of this type of gas adsorption process.Laboratory-prepared samples were studied with particular interest in evidence for Al—F bonding, or in fluoride species formed by reaction with —OH or —O. Also of interest was the role of sodium, since it is segregated to the surface of the alumina during calcination.Al—F bonding was observed on only one sample type. An Al—F interaction was identified when the alumina had been predried and dry HF was absorbed. When moisture was present no AlF3 formation was observed. This suggests that under conventional conditions (i.e. moisture present) the adsorption of HF involves a weak interaction, probably hydrogen bonding, with intermediate layers of water. After heating the samples containing weakly bound HF to 500°C, no Al—F interaction was observed. Much of the HF was desorbed at 700°C.An Na-F interaction was observed in all fluoride-adsorbed samples; however, this can only account for a small proportion of the total fluoride adsorbed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 12 (1988), S. 443-444 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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