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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 28 (1993), S. 259-266 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Abstract The convective heat transfer coefficient and pressure drop in ceramic foam structures are measured. Cordierite foams with 10, 20, 30 und 50 pores per inch (PPI) at empty tube velocities (of air) at 0.5 to 14 m/s are investigated. The convective heat transfer between fluid and substrate is described well within this velocity range by means of the assumptionNu=¢ ·Re m · Pr 1/3. The experimental method developed to obtain the values of ¢ andm is described. The data thus gained are discussed in view of an application of ceramic foams as catalyst supports and are compared with data of conventional parallel channel monoliths mentioned in the literature.
    Notes: Zusammenfassung Der konvektive Wärmeübergangskoeffizient und der Druckabfall in keramischen Schaumstrukturen werden gemessen. Es werden Cordierite-Schäume mit 10, 20, 30 und 50 Poren pro inch (PPI) bei Leerrohrgeschwindigkeiten (Luft) von 0,5 bis 14 m/s untersucht. Der konvektive Wärmeübergang zwischen Fluid und Feststoff wird in diesem Geschwindigkeitsbereich mit dem AnsatzNu=¢ ·Re m · Pr 1/3 gut beschrieben. Die zur Bestimmung der Parameter ¢ undm erarbeitete Meßmethode wird erläutert. Die damit erhaltenen Daten werden im Hinblick auf die Verwendung von keramischen Schäumen als Katalysatorträger diskutiert und mit Literaturdaten von herkömmlichen Parallelkanal-Monolithen verglichen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0167-0115
    Keywords: enzyme activation/inactivation ; isoenzyme ; lactic dehydrogenase ; peptide enzyme inhibitors
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-2451
    Keywords: Nephroptosis ; Nephropexy ; Urinary-LDH ; ING (Isotope Nephrogram) ; Nephroptose ; Nephropexie ; Urin-LDH ; ING (Isotopennephrogramm)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: ZusammenfaBung Nephroptose beim Patienten: Korrelation zwischen Urin-LDH-Anstieg (≧ 30%) im Stehen und pathologischem ING. Haltungsabhängige AktivitätBchwankungen des Enzyms im Urin. Hundeversuche (5 h): kontrollierte Flow-Verminderung (30%) der A. renalis allein bewirkt LDH-Anstieg (Freisetzung von LDH aus der Nierenzelle; MW 140 000). Die Gewebsdurchblutung (135 Xe) ist dabei im corticalen Nierenanteil vermindert (∼ 80 %). Rattenexperimente (1 Jahr): künstliche „Dauernephroptose” reduziert den DurchmeBer der A. renalis und bewirkt eine erhöhte LDH-Urie und ein pathologisches ING.
    Notes: Summary Criteria for nephroptosis as a pathogenic entity in man: an increase of urinary-LDH by ≧ 30% in erect vs. supine position (1-day test) ist always correlated with pathologic ING changes. Experiments in dogs: controlled flow reduction (30%) in the renal artery alone causes an increase of urinary-LDH (cell leakage of the enzyme; mol wt 140000). Nutrient flow (133 Xe) revealed a reduced cortical tIssue perfusion by ∼ 80%. Experiments in rats (1 year): permanent artificial “nephroptosis” reduces the caliber of the a. renalis and causes increases of the urinary-LDH correlated to a pathologic ING.
    Type of Medium: Electronic Resource
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