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  • Chemistry  (4)
  • Transcranial Doppler ultrasound  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Concept of system similarity in chemical engineering (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 1986-1992 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Fuzzy set theory is used to describe similarity of chemical engineering systems. The development of system similarity is given, and methods of determining a similarity relation are discussed. The system similarity relation is applied to the problems of measuring correlation confidence and quantifying modeling error. Sample problems are examined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690331207
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Development of methods to analyse transcranial Doppler ultrasound signals recorded in microgravity (1990)
    Springer
    Medical & biological engineering & computing 28 (1990), S. 306-311 
    Details
    ISSN: 1741-0444
    Keywords: Microgravity ; TCD ; Transcranial Doppler ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract During space flights, several clinical syndromes may be the result of changes in cerebral circulation. The purpose of the paper is to describe the development and initial evaluation of a system for recording, processing and displaying transcranial Doppler ultrasound (TCD) waveforms from the middle cerebral artery (MCA) in microgravity. Volunteers were repeatedly subjected to 15–20 s intervals of microgravity (‘near zero gravity’) during flights on the KC-135 military aircraft. Continuous TCD recordings from the MCA were stored on magnetic tape. The paper describes the system that was developed to digitise the Doppler ultrasound data and markers that corresponded to the various levels of microgravity, obtain the maximum and mean Doppler waveforms, identify the waveforms and quantify them. The results demonstrate the feasibility of making TCD recordings in a microgravity environment and illustrate excellent performance of the system and its ease of operation. Quantitative waveform analysis of the recordings from the first subject studied in the supine position showed statistically significant changes in MCA velocity waveforms during microgravity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446147
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anaerobe Behandlung eines industriellen Abwassers in einem Laborreaktor mit textilem Festbett (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1301-1302 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306909134
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ein einfaches lineares Modell zur Regelung der Brennzone eines katalytischen Festbettreaktors (1979)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 51 (1979), S. 681-681 
    Details
    ISSN: 0009-286X
    Keywords: Festbettreaktor ; Brennzone ; Katalysator ; Brennzonen- und Maximalwertregelung ; Zustandsregler ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330510631
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Order and molecular motion in wholly aromatic copolyesters (1997)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 48 (1997), S. 527-535 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The order and molecular dynamics of wholly aromatic thermotropic copolyesters prepared from hydroxybenzoic acid (HBA), hydroquinone (HQ) and phenoxyterephthalic acid (Ph-O-TPA) have been studied by X-ray analysis and deuteron NMR spectroscopy of specimens containing either deuterated hydroquinone or deuterated phenoxy side-chain units. X-ray analysis shows the coexistence of nematic and three-dimensionally ordered regions that are characterized by registry of adjacent chains with interleaved side groups. The molecular motions in these nematic/three-dimensionally ordered polymers are compared to those of a highly crystalline copolyester prepared from deuterated TPA and HQ. In the fast motional limit the motion in the crystalline system is characterized by 180° flips about the TPA axis, whereas in the nematic/three-dimensionally ordered copolyester the same type of axially symmetric spectrum is observed for both the nematic and the three-dimensionally ordered regions. The motion of the HQ units is characterized by rotational diffusion about the C1—C4 axis, augmented by fast rotational fluctuation of this axis about the main-chain direction. A model of free rotation about the axis of the phenyl group augmented by librations of restricted amplitude about the PhO-TPA bond for the ordered regions superimposed by slow axial motions about the main-chain axis in the nematic phase is consistent with both the NMR data and X-ray analysis.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1997.010481202
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    Paper (German National Licenses)
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