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  • tungsten  (3)
  • Acute occlusion of femoral-popliteal bypass  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    International journal of thermophysics 20 (1999), S. 1199-1209 
    ISSN: 1572-9567
    Schlagwort(e): heat of fusion ; high temperatures ; measurement of density ; measurement of temperature ; melting ; melting curve ; refractory metals ; tungsten ; wire explosion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Measurements of temperature and density during a wire-explosion experiment at atmospheric pressure are described. The measurements encompass a parameter range from the solid to near the critical point. The influence of a polytetrafluoroethylene coating of the wire, necessary to prevent surface discharges, on the temperature and density measurements is investigated. The melting curve of tungsten up to 4000 K is detemined.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    International journal of thermophysics 20 (1999), S. 1279-1288 
    ISSN: 1572-9567
    Schlagwort(e): compressibility ; electrical conductivity ; emissivity ; specific heat ; thermal conductivity ; thermal expansion coefficient ; tungsten
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Wire explosion experiments were used to obtain thermophysical properties of tungsten. These properties are specific heat, thermal expansion coefficient, compressibility, and electrical and thermal conductivities and their dependences on temperature. There are strong indications that the emissivity in the liquid range should be dependent on temperature. A proposal has been made for determining the emissivity from comparison of experiments with model calculations. The temperature range is extended up to 10,000 K, and first indications for the near-critical-point behavior were obtained. Other properties such as diffusivity, viscosity, and surface tension may possibly also be derived in this range.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Langenbeck's archives of surgery 372 (1987), S. 655-656 
    ISSN: 1435-2451
    Schlagwort(e): Local thrombolytic therapy ; Acute occlusion of peripheral artery ; Acute occlusion of femoral-popliteal bypass ; Lokale Thrombolyse ; Akuter Arterienverschluss ; Akuter Transplantatverschluss
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung 7 Jahre Erfahrung mit der lokalen niedrig dosierten thrombolytischen Behandlung von 564 Beinarterienverschlüssen ergaben: Embolische Verschlüsse liessen sich bis zu einer Dauer ihres Bestehens von 6 Wochen in 72,7% beseitigen, ältere noch in 42,3%. Thrombotische Verschlüsse bis zu einem Alter von 6 Monaten konnten in 58% erfolgreich behandelt werden, ältere nur noch in 36,2%. Die kumulative Durchgängigkeit erfolgreich behandelter Verschlüsse beträgt nach 5 Jahren 89,5% für embolische und 58,8% für thrombotische. Die Differentialtherapie der akuten Beindurchblutungsstörungen muss mit den Gefässchirurgen neu überdacht werden.
    Notizen: Summary The results of local low-dose thrombolytic treatments of 564 peripheral arterial occlusions were as follows: Embolic occlusions up to 6 weeks could be removed in 72.7%, the longer lasting occlusions in 42.3%. Thrombotic occlusions lasting up to 6 months were successfully treated in 58%, still older ones in 36.2%. The cumulative patency after 5 years was 89.5% in embolic and 58.8% in thrombotic occlusions. Therefore, the differential therapy of acute peripheral ischemia has to be thought over anew together with the vascular surgeons.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    International journal of thermophysics 19 (1998), S. 983-991 
    ISSN: 1572-9567
    Schlagwort(e): critical point ; electrical conductivity ; evaporation ; exploding wires ; high temperatures ; refractory metals ; thermal expansion ; tungsten
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Experimental results on exploding tungsten wires in air at atmospheric pressure at current densities ≥107 A·cm−2 and a current rise ≥1010 A·s−1 are presented. Besides the current through the probe and the voltage across it, the diameter of the wire material and its surface temperature have been measured. The final aim of this investigation is the determination of the thermophysical properties of a high-melting liquid metal up to its critical point. Here a first step should be made to demonstrate the reliability of the method and to justify the crucial assumptions. To determine the limits for the applicability of a homogeneous approach used so far, a one-dimensional numerical model in Z-pinch geometry has been used which gives the time evolution of the profiles of temperature, density, and pressure across the wire. The model describes well the main features observed in these experiments. A physical explanation for the maximum in the time dependences of the surface temperature is proposed. This behavior is related to special thermodynamic properties of a two-phase (liquid–gas) mixture forming in a peripheral layer around the liquid metal. The temperature limit is determined for which there are no remarkable gradients of temperature and density across the wire. The specific heat, the thermal expansion coefficient, and the electrical as well as thermal conductivity of liquid tungsten can now, in principle, be obtained. The parameters of the critical point of the liquid-vapor phase transition can also be estimated.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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