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  • Physics  (4)
  • computer-assisted assessment  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A comparison of the standard and the computerized versions of the Well-being Questionnaire (WBQ) and the Diabetes Treatment Satisfaction Questionnaire (DTSQ) (1997)
    Springer
    Quality of life research 7 (1997), S. 33-38 
    Details
    ISSN: 1573-2649
    Keywords: Diabetes mellitus ; computer-assisted assessment ; equivalence ; well-being ; satisfaction with treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the present study, the equivalence of paper and pencil assessment versus computer assessment of two self-administered questionnaires was investigated by means of a randomized cross-over design. Therefore, 105 out-patients with diabetes were invited to participate; 76 patients completed both the computer and the paper and pencil version of the Well-being Questionnaire (WBQ) and the Diabetes Treatment Satisfaction Questionnaire (DTSQ) in a randomized order, with a mean interval of 7 days. The scales showed high test-retest correlations and the means, dispersions, kurtosis and skewness were found to be approximately the same in both versions. In both modes of assessment, the depression and the energy scale proved to be sensitive for carry-over effects, resulting in better well-being scores at the second measurement. Almost all subjects reported that using the personal computer in the realization of a questionnaire was easy. It is concluded that the paper and pencil and the computerized versions of the WBQ and DTSQ can be considered equivalent. Therefore, the norms and cut-off scores obtained from paper and pencil assessments can be used in computerized versions of the WBQ and DTSQ and vice versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008832821181
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization of propadiene. IV. Kinetics and mechanism of polymerization under the influence of rhodium(I) complexes (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 3205-3213 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics and mechanisms of propadiene polymerization under the influence of [Rh(CO)2Cl]2, Rh(CO)2P(C6H5)3Cl, Rh(CO)3Cl are reported. The reaction rates are first-order in Rh(CO)2P(C6H5)3Cl and Rh(CO)3Cl and half-order in [Rh(CO)2Cl]2. They are second-order in the substrate for Rh(CO)3Cl and [Rh(CO)2Cl]2 and first-order for Rh(CO)2P(C6H5)3Cl. The data are interpreted in terms of a common intermediate mechanism. The formation of this common intermediate is the rate-determining step. A solvent effect is also discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170111214
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  • 3
    Electronic Resource
    Electronic Resource
    Polymerization of propadiene. I. Comparison of catalytic systems in relation to polymer structure and polymerization by a new Ni-based catalyst (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2395-2402 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A literature survey is given of the methods of preparation of 1,2-and 1,2,2,1-polyallene. The spectroscopic data and other physico-chemical properties are compiled. Spectral analysis of the products in relation to the catalyst used leads to conclusions with regard to the effect of electron-donating and electron-withdrawing ligands to the transition metal of the catalyst on the ratio of 1,2 to 1,2,2,1-polyallene structural units in the polymer obtained. This hypothesis enabled us to prepare a structurally homogeneous 1,2 polyallene in almost quantitative yield. The catalyst was prepared by adding propadiene to a benzene solution of Ni(II) acetylacetonate followed by addition of triisobutylaluminum. This sequence of addition appeared to be the essential factor for obtaining an active catalyst. A kinetic scheme for the polymerization is put forward.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090825
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  • 4
    Electronic Resource
    Electronic Resource
    Polymerization of propadiene. III. Catalyst systems based on various rhodium (I) complexes (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 3067-3076 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polymerization of propadiene to 1,2-polyallene by various Rh(I) based catalysts is described and discussed. Also the interrelations between these Rh(I) complexes are discussed and an overall reaction scheme is given. A mechanism is put forward in which the formation of a common intermediate from propadiene and different Rh(I) complexes is the rate determining step. It is found that the activity decreases in the order: cis-Rh(CO)2P(C6H5)3Cl 〉 [Rh(CO)2Cl]2 〉 Rh(CO)3Cl. The complexes Rh[P(C6H5)3]2(CO)Cl and Rh[P(C6H5)3]3Cl proved to be inactive in the polymerization of propadiene.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.170101023
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of propadiene. II. Catalyst systems based on 3d transition metals and various stabilizing ligands (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2403-2407 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A variety of catalyst systems based on 3d transition metals, i.e., V(III), Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), and various stabilizing ligands, i.e., propadiene, methylacetylene, phenylacetylene, and 1,4-butadiene, were prepared. The activity of these catalytic systems towards the polymerization of a series of monomers (propadiene, methylacetylene, phenylacetylene, 1,4-butadiene, ethene, and propene) is investigated. Optimum conditions for the preparation of 1,2-polyallene, polymethylacetylene and polyphenylacetylene are given.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090826
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