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  • Chemical Engineering  (3)
  • Allorosettenformation  (1)
  • Coastal engineering  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Environmental management 11 (1987), S. 175-182 
    ISSN: 1432-1009
    Schlagwort(e): Seawalls ; Bulkheads ; Coastal protection ; Coastal engineering ; Storms
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Seacliff State Beach, along the shoreline of northern Monterey Bay, California, has a well-documented history of repeated destruction and reconstruction of seawalls and park facilities. Seven times in 60 years the timber seawall has been destroyed by winter storm waves and subsequently rebuilt. The deficiencies of the wall, including (a) inadequate attachment of timber lagging to pilings, (b) inability of pilings or lagging to withstand repeated impact of waves and logs, and (c) inadequate height and internal drainage system have never been adequately addressed and each successive wall has essentially been identical to the previously destroyed wall.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1433-8580
    Schlagwort(e): Rat renal allograft ; GvHR ; allorosette ; blocking factor ; Rattennierentransplantation ; GvHR ; Allorosettenformation ; blockierender Serumfaktor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung 53 LBNF1-Nieren wurden auf L-Ratten transplantiert: 24 unbehandelte Empfänger überlebten durchschnittlich 16,1 ± 1,7 Tage. 14 Empfänger bekamen je 4 ml Alloantiserum (ADS, Gruppe 2), die restlichen 15 je 4 ml ALS (Gruppe 3). Davon überlebten 9 bzw. 10 Empfänger mehr als 4 Monate. Mit Milzzellen dieser permanent überlebenden 19 Ratten wurde eine GvHR durchgeführt. Grad und Index der GvHR ergaben eine normale, zellgebundene Immunantwort der Empfänger. Nach der Splenektomie erhielten sie erstmalig, 18 Tage später zum zweiten Mal Haut von LBNF1, 18 Tage danach Haut von LBufF1 transplantiert. Das erste Transplantat überlebte in der ADS-Gruppe 13,1 ± 1,9 Tage, in der ALS-Gruppe 12,2 ± 1,2 Tage. Das zweite wurde bei Gruppe 2 ebenfalls verzögert, bei Gruppe 3 fast gleich wie bei unbehandelten L-Ratten, das unspezifische Transplantat in beiden Gruppen regelrecht abgestoßen. Lymphozytotoxin und Hämagglutinin wurden vor und nach der Hauttransplantation bis zum 53. Tag nicht nachgewiesen. Die Seren beider Gruppen inhibierten die Allorosettenformation auf 46,0 ± 4,4% (ADS-Gruppen) bzw. 37,7 ± 9,2% (ALS-Gruppe), somit war ein blockierender FAktor im Serum der Empfänger vorhanden. Höchstwahrscheinlich hatten sich also bei diesen Empfängern nach der ALS-Therapie blockierende Antikörper gebildet, woraus sich ein Enhancement der Nierentransplantate entwickelte.
    Notizen: Summary 53 LBNF1 kidneys were grafted into L-rats. 24 untreated recipients served as control and survived 16.1 ± 1.7 days. 14 recipients were treated with 4 ml alloantiserum (ADS) each, and the other 15 animals with 4 ml ALS each. 9 and 10 of these 14 and 15 animals survived for more than 4 months. We performed GvH-reaction with spleen cells of these 19 animals. It showed normal cellular immune response. After splenectomy first donor specific skin was transplanted, 18 days later second skin of same origin (LBNF1) and 18 days after third party skin (LBufF1). The first grafts survived 13.1 ± 1.9 days in the recipients of ADS treatment and 12.2 ± 1.2 days in the recipients of ALS. Second skin grafts were rejected delayed in the former recipients as the first grafts, in the later more accelerated than the first grafts. The third grafts survived as the controls. Before and after skin grafting we could not detect lymphocytotoxin and hemagglutinin. The sera of animals with ADS therapy inhibited the spontaneous allorosette formation to 46.0 ± 4.4% and of ALS therapy 37.7 ± 9.2%. Our results suggest that after ALS treatment blocking antibodies were produced in the recipients and they cause the enhancement of kidney allograft.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 2446-2455 
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: In cyclones, the boundary layer formed on the collecting-wall surface acts as a barrier for particle migration toward the wall due to a decreased centrifugal force on particles inside the boundary layer. A new theory for high-efficiency cyclones based on the boundary-layer characteristics is presented. The cyclone was divided into two regions: the turbulent-core region where the centrifugal force is large, and the near-wall region where the centrifugal force is small. Particle trajectories in the turbulent-core region are calculated from the mean fluid motion based on the quasi-steady drag assumption, and the collection probability of particles in the near-wall region is calculated by the deposition velocity that results from both turbulent diffusion and centrifugal force. The deposition velocity by centrifugal force was assumed equal to the equilibrium migration velocity at a certain point inside the boundary layer, and the distance to that point from the wall is assumed to be linearly proportional to the dimensionless-particle relaxation time. When the proportional constant was determined by fitting the theoretical results to experimental data, the theory showed an excellent enhancement in predicting the variation of collection efficiency with the inlet flow velocity and particle size.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 10 (1964), S. 747-752 
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The radial components of the turbulence energy and intensity spectra within a stirred, baffled tank are measured with a transducer probe of the type developed by Eagleson et al. (9). The spectra are normalized because absolute levels of the intensity in these high intensity velocity fields cannot be measured with the present technique. Average velocities are also measured with Pitot and Prandtl tubes.Range of measured energy and intensity spectra was 19 to 1,100 cycles/sec. The measured energy spectra show a k-5/3-relation in the low wave number range where the wave number k is less than 100 ft.-1 and a k-10/3-relation in the wave number range of 100 to 1,000 ft.-1. This behavior is found regardless of impeller size, motor speed, and position in tank, in particular radial distance, indicating that the decay of energy spectra is self-preserving. Increasing the viscosity from 0.80 to 103 centipoises results in a progressively steeper slope in the high wave number range. The shape of the intensity spectra is the same as that of the concentration spectra measured by Manning (26, 27).
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 1115-1125 
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Blends of bisphenol-A polycarbonate (PC) with poly- (styrene-co-acrylonitrile) (SAN) and poly (acrylonitrile-butadiene-styrene) (ABS) prepared by screw extrusion and solution-casting were investigated by differential scanning calorimetry and scanning electron microscopy. From the measured glass-transition temperatures (Tg) and specific heat increments (ΔCp) at the Tg, SAN appears to dissolve more in the PC-rich phase than does PC in the SAN-rich phase. Also, the decrease of Tg (PC) in PC/ABS blends is larger than in the PC/SAN blends. From the Tg behavior and the electron microscopy study, it is suggested that the compatibility increases more in the SAN-rich compositions than in the PC-rich compositions of the blends. In the study of extrudate swell of the PC/SAN blends and the PC/ABS blends, the maximum level of extrudate swell is reached at 0.5 weight fraction of PC for both blend systems. The Flory-Huggins polymer-polymer interaction parameter (χ12) between PC and SAN was calculated and found to be 0.034 ± 0.004. A similar value of χ for PC and SAN was found with the PC/ABS blends.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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