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  • 1
    Digitale Medien
    Digitale Medien
    Consistent values of rate parameters in free radical polymerization systems (1988)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 26 (1988), S. 293-297 
    Details
    ISSN: 0887-6258
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1988.140260704
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  • 2
    Digitale Medien
    Digitale Medien
    Quantification of dideoxycytidine in human plasma by gas chromatography/mass spectrometry (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 17 (1988), S. 399-404 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A gas chromatographic/mass spectrometric procedure has been developed for the quantification in plasma of dideoxycytidine (DDC), a candidate anti-AIDS drug. The assay uses an extraction with ethyl acetate containing 10% methanol followed by three derivatization steps: (i) reaction with t-butyl dimethyl chlorosilane to silylate the 5′-hydroxyl group; (ii) pentafluorobenzoylation of the amino group with pentafluorobenzoyl chloride; (iii) methylation of the ring nitrogen adjacent to the amino group with diazomethane. The resulting derivative is quantified using stable isotope dilution, selective ion monitoring and methane negative chemical ionization mass spectrometry. Plasma concentrations of DDC were measured over a range of 2-200 ng ml-1 using 1 ml plasma for extraction.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200170509
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of rapid thermal annealing on the electrical properties of Hg1 - xCdxTe bulk crystals (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 177-182 
    Details
    ISSN: 1057-9257
    Schlagwort(e): RTA ; Mercury Cadmium ; Telluride ; Hall characterization ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: This paper reports the change in the bulk transport properties of p-type MCT samples induced by a rapid thermal annealing (RTA) process. This change is produced homogeneously within the crystal without interchange of mercury with the surrounding atmosphere. The carrier concentration varies towards an equilibrium value that depends only on the annealing temperature. For the material and temperatures investigated (250-420°C) the equilibrium carrier concentration depends exponentially on the inverse of the temperature, its value ranges between 1 × 1017 and 4 × 1017 cm-3. The time needed to reach equilibrium is a function of the temperature, varying from 10 s at 420°C to 200 s at 250°C. The hole mobility is also affected by the RTA process, its evolution being a function of the process temperature and time. A model is proposed to explain these modifications based on a reaction of generation-annhilitation of mercury vacancies and interstitials that would take place within the crystal with no external interaction.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/amo.860030125
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  • 4
    Digitale Medien
    Digitale Medien
    Conversion prediction in high conversion free-radical polymerizationsPresented at the AIChE Annual Meeting, New Orleans, LA, November 18-12, 1981 (1982)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 22 (1982), S. 777-787 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The objective of this article is to introduce anew general approach For conversion prediction in high-conversion free-radical polymerizations-“The Method of Kinetic Similarity.” Using a single homopolymer reference curve of methyl meth-acrylate (MMA) and one to two time-scaling parameters, the conversion vs. time curves for MM A, ethyl methacrylate (EMA), vinyl chloride (VC), acrylonitrile (AN), styrene methyl methacrylate (SMMA), and styrene acrylonitrile (SAN) could be well-described. For MMA and VC, these parameters are shown to obey expected Arrhenius relationships over 45 to 90°CC and 30 to 70°C, respectively. The method is simple to apply, continuous over the whole conversion range, utilizes existing knowledge at low and limiting conversions, and avoids application of usual low conversion assumptions into the diffusion-controlled region.
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760221208
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  • 5
    Digitale Medien
    Digitale Medien
    Bulk polymerization of acrylonitrile. I. An experimental investigation of the kinetics of the bulk polymerization of acrylonitrile (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 1397-1411 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A comprehensive experimental investigation is reported of the bulk polymerization of acrylonitrile (AN) to limiting conversion using 2,2′-azobisisobutyronitrile (AIBN) as initiator at 40°, 60°, and 80°C. Molecular weight development was followed by gel permeation chromatography (GPC).
    Zusätzliches Material: 18 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1979.070230511
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  • 6
    Digitale Medien
    Digitale Medien
    The effect of composition, sequence length, and tacticity on the UV absorption analysis of styrene copolymers in solution (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 2043-2052 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: As a first step in the elucidation of the microstructure of styrene copolymers using ultraviolet spectroscopy, the data available in the literature has been reviewed and reevaluated. It is shown by using simple error propagation analysis that the abnormalities observed in the extinction coefficients of styrene copolymers can be easily attributed to the experimental error. No significant deviations from the linear absorption behavior can be observed at the specific wavelengths reported in the literature (254-269 nm). As a result of this work, a useful set of correlations for the estimation of the copolymer composition have been obtained. These correlations appear to be adequate for copolymers of different microstructure.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1982.070270617
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  • 7
    Digitale Medien
    Digitale Medien
    Bulk polymerization of acrylonitrile. II. Model development (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 1413-1429 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A model for bulk polymerization of AN is developed. It adequately predicts conversion-time histories and molecular weight development in the temperature range of 40°-80°C with AIBN as initiator. It is shown that this model has predictive powers by simulating nonisothermal conversion-time histories.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1979.070230512
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  • 8
    Digitale Medien
    Digitale Medien
    Density functional potential energy hypersurface of protonated ozone: A comparison between different gradient-corrected nonlocal functionals (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 61 (1997), S. 415-420 
    Details
    ISSN: 0020-7608
    Schlagwort(e): Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The more stable isomers obtained by protonation of both cyclic and open-chain forms of ozone (O3) were studied by the linear combination of Gaussian-type orbitals-density functional (LCGTO-DF) method. Features of the first-order saddle points connecting them were also investigated. Nonlocal corrections to the exchange-correlation energy were added using different kinds of functionals. The calculated proton affinity (PA) values at 298 K compare favorably with the recent experimental determination. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Localized orbitals in nonmetallic ring systems (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 70 (1998), S. 167-180 
    Details
    ISSN: 0020-7608
    Schlagwort(e): localized orbitals ; periodic structures ; perturbation theory ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Localized molecular Hartree-Fock orbitals have been determined by means of an iterative procedure consisting of orthogonalization and configuration interaction employing single excitations. For ring systems the rotational symmetry has been included explicitly to obtain Wannier-like orbitals suited for a posteriori correlation calculations using only the most important contributions within a limited region around one reference ring segment. Applications involving different estimates of the correlation energy include as model systems (H2)2n+1, the ionic LinHn, and a weakly bound beryllium ring as well as the strongly covalent molecule (CH2)36 forming a closed ring. In all cases, the localized and canonical MP2 results are close, and the localized Epstein-Nesbet second-order gives a good estimate of more expensive MP4 or CEPA-0 values.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 167-180, 1998
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Using full-CI algorithms in Bethe-Goldstone-type expansions of the correlation energy (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 61 (1997), S. 35-43 
    Details
    ISSN: 0020-7608
    Schlagwort(e): Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: In the early 1960s, Nesbet proposed to develop correlation energy in terms of two-, three-, four-, etc., electron contributions. This expansion was, in principle, applicable to a large number of electrons without a size-extensivity error. The now available full-CI algorithms may be used to obtain those expansions in terms of either occupied spin - orbitals or, more efficiently, in terms of sets of occupied or virtual molecular orbitals. Tests on the NH3 molecule with a DZP basis-set problem show the slow convergence of this approach. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 6 Tab.
    Materialart: Digitale Medien
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