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  • ACOUSTICS  (7)
  • Polymer and Materials Science  (4)
  • Aerospace Medicine  (3)
  • Benthic environment  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Hochdruckphasengleichgewicht in Mischungen aus Ethylen und (Ethylen-Vinylacetat)-Copolymeren. Teil II. Der TemperatureinflußTeil I: siehe [4] (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 468-471 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In addition to the predominant dependence on vinylacetate content of the copolymers, temperature shows a significant influence on the high pressure phase equilibrium in the mixtures. That is demonstrated by experimental cloudpoint curves (pressure). In comparison with them coexistence data are calculated for 5 different samples of (ethylene-vinylacetate)-copolymers and the temperature dependence of all model parameters is investigated and correlated.
    Notes: Nach dem Vinylacetatgehalt der Copolymere übt die Temperatur einen wesentlichen Einfluß auf die Lage des Hochdruckphasengleichgewichtes aus, der durch Trübungsdruckmessungen ermittelt werden kann. In Übereinstimmung damit erfolgen Berechnungen zu Koexistenzdaten für 5 verschiedene Ethylen-Vinylacetat-Copolymere, wobei die Temperaturabhängigkeit aller Modellparameter untersucht und korreliert wird.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330805
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen Zum Hochdruckphasengleichgewicht in Mischungen aus Ethylen und (ethylen-Vinylacetat)-Copolymeren. Teil I. Zur Abhängigkeit vom Vinylacetatgehalt des Copolymers (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 463-467 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Optimizing the equipment for producing high pressure (ethylene-vinylacetate)-copolymers requires data and models for the phase equilibrium conditions at high pressure. Information on the system ethylene + (ethylene-vinylacetate)-copolymer is important for this purpose. Experimental results (cloud-point curves) and model calculations (coexistencecurves) are presented with particular attention to the dependence on vinylacetate content of copolymers.
    Notes: Die Optimierung des technischen Hochdruckverfahrens zur Herstellung von (Ethylen-Vinylacetat)-Copolymeren erfordert Daten und Modelle des Hochdruckphasengleichgewichtes. Insbesondere interessieren Informationen über das Teilsystem Ethylen + (Ethylen-Vinylacetat)-Copolymere, die aus experimentellen Untersuchungen von Trübungsdruckkurven und aus Ergebnissen von Modellrechnungen zu Koexistenzdaten gewonnen werden. Dabei wird der Abhängigkeit vom Vinylacetatgehalt des Copolymers besondere Aufmerksamkeit geschenkt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330804
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Hochdruckphasengleichgewicht in Mischungen aus Ethylen und (Ethylen-Vinylacetat)-Copolymeren. Teil III. Der Einfluß der MolmassenverteilungTeile I und II: Acta Polymerica 33 (1982) 463 und 478 (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 340-344 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In addition to the dependence on temperature and vinylacetate content of the copolymers, the molar mass distribution of the copolymers shows a significant influence on the high pressure phase equilibrium in the mixtures. This is demonstrated by experimental pressure-cloudpoint curves. The coexistence data are calculated with 5 different fractions of a copolymer with 33% vinylacetate content and reflect the experimental results precisely. Model calculations by a classical discontinuous calculation procedure allow the prediction of coexistence curves without additional molar mass-dependence of the model parameters. Further results are provided for the solubilities of the components in the pressure range of 30 to 100 MPa.
    Notes: Neben der Temperatur und dem Vinylacetatgehalt des Copolymers übt die Molmassenverteilung des Copolymers einen wesentlichen Einfluß auf die Lage des Hochdruckphasengleichgewichtes aus, was durch Trübungsdruckmessungen experimentell gezeigt wird. Die Berechnungen zu Koexistenzdaten für 5 verschiedene Fraktionen eines (Ethylen-Vinylacetat)-Copolymers mit ca. 33% Vinylacetatgehalt spiegeln die experimentellen Verhältnisse wider. Die Modellrechnungen mit einem klassisch diskontinuierlichen Berechnungsverfahren ermöglichen die Vorausberechnung der Koexistenzdaten ohne zusätzliche Molmassenabhängigkeit der Modellparameter. Weiterhin werden Ergebnisse zur gegenseitigen Löslichkeit im Druckbereich von 30 bis 100 MPa mitgeteilt.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340607
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  • 4
    Electronic Resource
    Electronic Resource
    Das Hochdruckphasengleichgewicht im System Ethylen + Vinylacetat + (Ethylen-Vinylacetat)-CopolymereHerrn Professor Dr. habil. Joachim Ulbricht zum 60. Geburtstag gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 498-503 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: High pressure phase equilibrium calculations are performed with 5 (ethylene-vinylacetate)-copolymers of different vinylacetate content (8 to 42% VA). Miscibility gaps occur in the pressure range from 40 to 140 MPa. Measured pressure cloudpoints of a copolymer are compared with the calculated results. Investigations with inverse gas-liquid-chromatography provide thermodynamic data of the binary system vinylacetate + (ethylene-vinylacetate)-copolymer. The presented results show for the first time a complete picture about the demixing behaviour in this ternary system, where the monomer-mixturelines in the supercritical range. The miscibility gap is predominantly caused by the vinylacetate content of the copolymers. The influence of the distribution of molecular weight is clearly deminished in comparison to the binary system ethylene + (ethylene-vinylacetate)-copolymer.
    Notes: Berechnungen zum Hochdruckphasengleichgewicht mit fünf (Ethylen-Vinylacetat)-Copolymeren verschiedenen Vinylacetatgehaltes (8 bis 42% VA) werden durchgeführt. Die Mischungslücken im Druckbereich von 40 bis 140 MPa werden angegeben. Einige experimentelle Trübungsdrücke für ein Copolymer werden ermittelt und mit den Berechnungsergebnissen verglichen. Untersuchungen mit inverser Gaschromatographie dienen der Gewinnung thermodynamischer Daten für das binäre Teilsystem Vinylacetat + (Ethylen-Vinylacetat)-Copolymer. Die vorgelegten Ergebnisse liefern erstmalig ein geschlossenes Bild über das Phasenverhalten im ternären System, wobei die Mischung der Monomere überkritisch vorliegt. Der wesentliche Einflußfaktor auf die Entmischung ist durch den Vinylacetatgehalt des Copolymers gegeben. Der Einfluß der Molmassenverteilung wird gegenüber dem Teilsystem Ethylen + (Ethylen-Vinylacetat)-Copolymer deutlich verringert.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350705
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  • 5
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    Oxygen transport and cardiovascular function at extreme altitude: lessons from Operation Everest II (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Operation Everest II was designed to examine the physiological responses to gradual decompression simulating an ascent of Mt Everest (8,848 m) to an inspired PO2 of 43 mmHg. The principal studies conducted were cardiovascular, respiratory, muscular-skeletal and metabolic responses to exercise. Eight healthy males aged 21-31 years began the "ascent" and six successfully reached the "summit", where their resting arterial blood gases were PO2 = 30 mmHg and PCO2 = 11 mmHg, pH = 7.56. Their maximal oxygen uptake decreased from 3.98 +/- 0.2 L/min at sea level to 1.17 +/- 0.08 L/min at PIO2 43 mmHg. The principal factors responsible for oxygen transport from the atmosphere to tissues were (1) Alveolar ventilation--a four fold increase. (2) Diffusion from the alveolus to end capillary blood--unchanged. (3) Cardiac function (assessed by hemodynamics, echocardiography and electrocardiography)--normal--although maximum cardiac output and heart rate were reduced. (4) Oxygen extraction--maximal with PvO2 14.8 +/- 1 mmHg. With increasing altitude maximal blood and muscle lactate progressively declined although at any submaximal intensity blood and muscle lactate was higher at higher altitudes.
    Keywords: Aerospace Medicine
    Type: International journal of sports medicine (ISSN 0172-4622); Volume 13 Suppl 1; S13-8
    Format: text
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  • 6
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    Pulmonary gas exchange (1998)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: No abstract available
    Keywords: Aerospace Medicine
    Type: American journal of respiratory and critical care medicine (ISSN 1073-449X); Volume 157; 4 Pt 2; S82-7
    Format: text
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  • 7
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    Acoustic loading in planar networks (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The acoustic loading in a complex planar network of ducts is determined by a method in which Green function surface elements are used. The network consists of straight ducts, elbows and branched ducts. A transfer matrix technique is developed in which each duct is treated separately and the matrix of the influence coefficients is transformed to tri-diagonal form allowing efficient inversion.
    Keywords: ACOUSTICS
    Type: Journal of Sound and Vibration (ISSN 0022-460X); 88; 151-162
    Format: text
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  • 8
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    Harmonic response of cylindrical and toroidal shells to an internal acoustic field. I - Theory. II - Results (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In the first part of the present work concerning the coupled elastic and acoustic response of a system of cylindrical and toroidal shells enclosing an acoustic medium, the theoretical model for the cylindrical and toroidal segments' elastodynamics incorporates an elastic simulation based on transfer matrices, while the acoustic simulation adapts Green's function and curved surface elements. The coupled response is determined by the equilibrium of the acoustic pressure and internal elastic reactions of the shell, and compatibility between acoustic and elastic accelerations at the shell-fluid interface. The second part of this work obtains and discusses numerical results based on the theory for the cases of shell configurations having a plane of symmetry, as well as asymmetric ones. The inadequacy of beam theory in modeling the response of short, thin shell configurations at frequencies above the fundamental elastic resonance is demonstrated.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 78; 738-757
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  • 9
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    Acoustic propagation in resonant axisymmetric cavities enclosing an inhomogeneous medium. I - Hollow cavity. II Cavity with center body (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Keywords: ACOUSTICS
    Type: Acoustical Society of America, Journal (ISSN 0001-4966); 74; 1583-160
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  • 10
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    Acoustic propagation in a rigid torus (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The acoustic propagation in a rigid torus is analyzed using a Green's function method. Three types of surface elements are developed; a flat quadrilateral element used in modeling polygonal cavities, a curved conical element appropriate for surfaces with one curvature, and a toroidal element developed for such doubly curved surfaces as the torus. Curved elements are necessary since the acoustic pressure is sensitive to slope discontinuities between consecutive surface elements especially near cavity resonances. The acoustic characteristics of the torus are compared to those of a bend of square cross section for a frequency range that includes the transverse acoustic resonance. Two equivalences between the different sections are tested; the first conserves curvature and cross-sectional dimension while the second matches transverse resonance and duct volume. The second equivalence accurately matches the acoustic characteristics of the torus up to the cutoff frequency corresponding to a mode with two circumferential waves.
    Keywords: ACOUSTICS
    Type: Acoustical Society of America; vol. 71
    Format: text
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