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  • 11
    Electronic Resource
    Electronic Resource
    Applications of computational fluid dynamics in the chemical industryDedicated to Professor Dr. Dr. h. c. Hanns Hofmann on the occasion of his 70th Birthday (1994)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 17 (1994), S. 145-148 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In order to illustrate the use of CFD in providing an understanding of mixing processes, three examples, mixing in a pipe, homogenization with a static mixer and flow in a mixing vessel with a Rushton turbine, are discussed and compared with experimental results. Special attention is focussed on the resultant concentration distribution, which is closely linked to turbulent properties. A semi-empirical model is presented for a quantitative prediction of the initial turbulent conditions. Using special numerical techniques a mixing vessel with wall-separated baffles, which represents a problem generally regarded as beyond the capabilities of numerical analysis, can be simulated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270170302
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Absorption von NOx in einer Salpetersäure-Kolonne (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 220-223 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330660220
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  • 13
    Electronic Resource
    Electronic Resource
    Widersprüchliche Ergebnisse bei Konfigurationsbestimmungen durch kinetische Racemat-Spaltung (1971)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 748 (1971), S. 20-25 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contradictory Results in Configurational Assignments by Kinetic ResolutionKinetic resolution of the cyclic anhydrides 1a-c of threo-configurated dialkylsuccinic acids by means of (+)-R-1-[α-naphthyl]-ethylamine [(+)-2] and (+)-R-1-phenylethylamine [(+)-3] takes the same course. The same amines (+)-2 and (+)-3 show opposite behaviour in the reaction with racem. α-phenylbutyric acid anhydride (4). Reasons are discussed for results contrary to Horeau's rule for kinetic resolutions of carboxylic anhydrides by means of optically active amines.
    Notes: Die kinetische Racemat-Spaltung der cyclischen Anhydride 1a-c threo-konfigurierter Dialkylbernsteinsäuren durch (+)-R-1-[α-Naphthyl]-äthylamin [(+)-2] und (+)-R-1-Phenyl-äthylamin [(+)-3] verläuft gleichsinnig. Einander entgegengesetztes Reaktionsverhalten zeigen die Amine (+)-2 und (+)-3 jedoch bei der Umsetzung mit racem. α-Phenyl-butter-säureanhydrid (4). Gründe für die Nicht-Anwendbarkeit der Horeauschen Regel bei kinetischen Racemat-Spaltungen von Carbonsäureanhydriden durch optisch aktive Amine werden diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19717480103
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  • 14
    Electronic Resource
    Electronic Resource
    Zur absoluten Konfiguration der Chlorophylle, VI1) Bestimmung der absoluten Konfiguration von Chlorophyll a nach der Methode von Horeau (1974)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 1017-1027 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Absolute Configuration of Chlorophylls, VI1). - The Determination of the Absolute Configuration of Chlorophyll a by the Method of HoreauAn auxiliary center of asymmetry can be introduced into methylphaeophorbide a (1) by reduction of the 9-carbonyl group. After separation of the resulting epimers 2 and 3, their 9-hydroxy groups are acylated under kinetically controlled conditions with a-phenylbutyric anhydride. The interpretation of the observed stereoselectivity allows deduction of the chirality at C-10 of 1 and thus the absolute configuration of chlorophyll a. The relative configurations of 2 and 3 are proved by chemical as well as 1H-NMR- and mass-spectrometric methods.
    Notes: Durch Reduktion der Carbonylgruppe am C-9 läßt sich ein, “Hilfsasymmetriezentrum” in Methylphäophorbid a (1) einführen. Nach Trennung der dabei entstehenden Epimeren 2 und 3 werden deren Hydroxygruppen am C-9 unter kinetisch kontrollierten Bedingungen mit racem. α-Phenylbuttersäureanhydrid acyliert. Die Interpretation der beobachteten Stereoselektivitäten gestattet es, die Chiralität am C-10 von 1 und damit die absolute Konfiguration des Chlorophylls a abzuleiten. Die relative Konfiguration von 2 und 3 wird chemisch sowie IH-NMR- und massenspektrometrisch bewiesen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197419740702
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  • 15
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    Segmental myocardial velocities in dilated cardiomyopathy with and without left bundle branch block (2012)
    Wiley-Blackwell
    Details
    Publication Date: 2012-09-15
    Description: Purpose: To quantify three-directional left ventricular (LV) myocardial velocities and intraventricular synchrony in dilated cardiomyopathy (DCM) with and without left bundle branch block (LBBB) using MR tissue phase mapping (TPM). Materials and Methods: Regional velocities were assessed by TPM (spatial/temporal resolution = 1.3 × 1.3 mm 2 × 8 mm/14 ms) in DCM patients with (n = 12) and without LBBB (n = 7) compared with age-matched volunteers (n = 20). For the evaluation the AHA 16-segment and an extended LV visualization model was used. Results: Radial velocities in DCM patients were reduced in 75% (systole) and in 94% (diastole) ( P = 0.0001 – P = 0.0360), long-axis velocities in 31% (systole) and in 75% (diastole) of the 16 segments compared with controls ( P = 0.0001 – P = 0.0310). LBBB resulted in inferolaterally delayed diastolic long-axis velocities ( P = 0.0012 – P = 0.0464) and shortened TTP for septal systolic radial velocities ( P = 0.0002). Intra-ventricular radial systolic TTP differed up to 150 ms between segments in patients with LBBB (89 ms without LBBB, 34 ms in volunteers) reflecting an increased dyssynchrony. LV twist was altered in all patients with reduced and delayed systolic and diastolic peak velocities. Conclusion: TPM identified previously not described alterations of the spatial distribution and timing of all myocardial velocities in patients with DCM and LBBB. This may help to optimize therapy management in future. J. Magn. Reson. Imaging 2012;. © 2012 Wiley Periodicals, Inc.
    Print ISSN: 1053-1807
    Electronic ISSN: 1522-2586
    Topics: Medicine
    Published by Wiley-Blackwell
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