| 1. |
- Hellsing, AL, et al.
(författare)
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Ergonomic education for nursing students
- 1993
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Ingår i: International Journal of Nursing Studies. - 0020-7489 .- 1873-491X. ; 30:6, s. 499-510
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Andersson, Arne, et al.
(författare)
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Direct Propane Ammoxidation to Acrylonitrile: Kinetics and Nature of the Active Phase
- 1993
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Ingår i: New Frontiers in Catalysis (Studies in Surface Science and Catalysis ). - 0167-2991. ; 75, s. 691-705
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Konferensbidrag (refereegranskat)abstract
- The kinetics of the direct synthesis of acrylonitrile from propane on V-Sb-Al-(W) mixed oxides indicate that acrylonitrile (ACN) forms by two parallel pathways, one directly from propane and the second, which is the prevalent path, through the intermediate formation of propylene (C3=). The limiting factor in the formation of ACN is the relative slowness of the step of allylic oxidation to ACN of the intermediate C3=, and the higher rate of C3= oxidation to carbon oxides as compared to that of ACN to COx. The step of C3= oxidation to ACN is controlled by the surface availability of NH3 which, in turn, depends considerably on the side reaction of NH3 oxidation to N2. The catalytic behavior of different modified V-Sb-(Al)-O systems and their characterization by X-ray diffraction analysis and Raman, Infrared and X-ray Photoelectron spectroscopies indicate that i) a reduction of both V and Sb occurs during the catalytic reaction, ii) the presence of vanadium not stabilized in the rutile-like phase is responsible for the side reaction of NH3 oxidation and lowering of the selectivity, iii) alumina reacts with antimony forming an AlSbO4 rutile phase which could be epitaxially intergrown or in solid solution with the VSbO4/Sb2O4 system, which, in turn, limits the presence of not stabilized (unselective) vanadium species, and iv) antimony oxide supported on alumina is also selective in propane ammoxidation, but forming acetonitrile as the main product. The doping with vanadium of this sample increases slightly the activity, but especially gives rise to the formation of acrylonitrile instead of acetonitrile.
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| 3. |
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| 4. |
- Ruth, Jan-Erik, et al.
(författare)
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Old age and loneliness illustrated by the Zulliger
- 1990
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Ingår i: British Journal of Projective Psychology. - 0957-7785. ; 25:2, s. 61-73
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Investigated the personality structure in old age, focusing on sociability and loneliness, using the Zulliger Individual and Group Test among 32 noninstitutionalized elderly adults (aged 75–85 yrs) and 36 control adults (aged 31–60 yrs). 15 elderly Ss were considered to be sociable, and 17 were considered to be lonely. J. E. Exner's (1986) comprehensive Rorschach system was used to analyze the data. Sociable Ss were lively and independent, although slightly aggressive and hostile. They showed signs of helplessness and experienced feelings of uneasiness. These Ss retained more liveliness with respect to their basic personality structure compared with lonely Ss. Lonely Ss were more prone to withdraw and simplify their conception of the surrounding world.
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| 5. |
- Sanati, Mehri, et al.
(författare)
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A Study of Spreading of Vanadia on Titania Polymorphs Using Mechanical Mixtures
- 1993
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Ingår i: New Frontiers in Catalysis (Studies in Surface Science and Catalysis ). - 0167-2991. ; 75, s. 1755-1758
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Konferensbidrag (refereegranskat)abstract
- Mechanical mixtures of V2O5 and each of the three titania polymorphs TiO2(B), anatase and rutile were heated in air at 450°C. Spreading of vanadia was found to occur on all three polymorphs. After 36 hours of heating, coverage with interacting vanadia (the part that is insoluble in aq. NH3) on TiO2(B), anatase and rutile, respectively, was 54, 48 and 38 % of a theoretical monolayer. Raman spectra confirmed spreading and interaction. HREM images revealed no formation of multilayers of vanadia on titania. Use of the monolayer catalysts for toluene ammoxidation indicated their activity for benzonitrile formation to vary with respect to support in the order TiO2(B) > anatase > rutile.
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| 6. |
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