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  • Analytical Chemistry and Spectroscopy  (2)
  • steady flow  (2)
  • Ascomycetes  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Utilisation of organic nitrogen and phosphorus sources by mycorrhizal endophytes of Woollsia pungens (Cav.) F. Muell. (Epacridaceae) (1999)
    Springer
    Mycorrhiza 8 (1999), S. 181-187 
    Details
    ISSN: 1432-1890
    Schlagwort(e): Key words Ericaceae ; Hymenoscyphus ericae ; Ericoid mycorrhiza ; Plant nutrition ; Ascomycetes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The ability of four ericoid mycorrhizal endophytes isolated from roots of Woollsia pungens (Cav.) F. Muell. (Epacridaceae) to utilise organic forms of nitrogen and phosphorus during growth in axenic culture was assessed. All isolates were able to utilise glutamine, arginine and bovine serum albumin (BSA), along with NH4 + or NO3 –, in most cases yielding at least as much biomass as the ericoid mycorrhizal endophyte Hymenoscyphus ericae (Read) Korf & Kernan. All isolated endophytes were able to utilise BSA, arginine and glutamine as sole sources of N and C. With the exception of a single isolate (C40), which showed little growth on glutamine, biomass yields on glutamine as the sole N and C source was significantly greater for all isolates than on either of the other two organic N sources. Two isolates from W. pungens (C40 and A43) utilised DNA and sodium inositol hexaphosphate as sole P sources, in each case yielding significantly more biomass than H. ericae. The results suggest that mycorrhizal endophytes from epacrid plant hosts and those from ericaceous hosts have similar abilities to utilise organic forms of N and P.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s005720050232
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  • 2
    Digitale Medien
    Digitale Medien
    Velocity characteristics of steady flow through a straight generic inlet port (1995)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 21 (1995), S. 571-590 
    Details
    ISSN: 0271-2091
    Schlagwort(e): CDF ; predictions ; laser Doppler anemometry ; inlet port ; cylinder ; turbulence ; steady flow ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: This paper presents a combined experimental and computational study of the steady flow through an internal combustion engine inlet port. The port was of generic design with a straight centreline. The three-dimensional velocity and turbulence fields in the port and cylinder were simulated using a computational fluid dynamics programme. Laser sheet flow visualization and laser Doppler anemometry were also employed to investigate the flows and assess the predictions. The results show that a large-scale flow structure is created in the cylinder by the inlet jet and its interaction with the valve and cylinder walls. Both predictions and measurements show that the flow is strongly dependent on the valve lift but is not affected by the flow rate. Comparisons of the numerical predictions with the experimental data indicated that the mean flow features are accurately predicted in many parts of the flow field; some discrepancies are evident and stem primarily from the failure of the simulation to predict a small recirculation region in the port which affects the trajectory of the annular jet entering the cylinder. Calculations were also made without modelling the port shape by using simplified inlet conditions upstream of the valve seat. It was found that this approximation can provide a reasonable, albeit less accurate, description of the flow, but modelling of the port shape is necessary for accurate flow predictions.
    Zusätzliches Material: 18 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650210704
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Solvent dependence of 13C relaxation times and reorientational dynamics in tribromobenzene (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 675-678 
    Details
    ISSN: 0749-1581
    Schlagwort(e): Tribromobenzene ; 13C spin-lattice relaxation times ; correlation times ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The 13C spin-lattice relaxation times and nuclear Overhauser enhancements of protonated carbons in 1, 3, 5-tribromobenzene were measured in a number of solvents of widely varying viscosity, Derived reorientational correlation times were found to increase approximately linearly with solution viscosity, as predicted by hydrodynamic theories of rotational diffusion.Rotational correlation times calculated from the perrin stick model were two to three times longer than the measured τc values. Similarly, correlation times predicted by the Hu-Zwanzig slip model were too small by a factor of two. On the other hand, application of the newer Hynes-Kapral-Weinberg theory furnished reorientational correlation times that were in virtually quantitative agreement with the experimental results.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260260807
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  • 4
    Digitale Medien
    Digitale Medien
    Raman and infrared study of reorientational dynamics in trifluorobenzene (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 27-30 
    Details
    ISSN: 0377-0486
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The Raman spectral bandwidths of two A1′ vibrations of 1,3,5-trifluorobenzene (TFB) were measured in the neat liquid as a function of temperature and in the solvents CH2Cl2 and CS2. The Raman and IR linewidths of two E′ modes were also measured in solution. Derived values of the two rotational diffusion constants, D⊥ and D∥, were compared with the predictions of several current theories. It was observed that the Hynes-Kapral-Weinberg (HKW) theory is superior to both the microviscosity-free rotor and Hu-Zwanzig ‘slip’ models of reorientational diffusion. Calculated values of D⊥ and D∥ for TFB in solution using the HKW model are in excellent agreement with the experimentally measured diffusion constants.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jrs.1250200106
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  • 5
    Digitale Medien
    Digitale Medien
    ON THE STRUCTURE OF STEADY FLOW THROUGH DUAL-INTAKE ENGINE PORTS (1996)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 23 (1996), S. 1085-1109 
    Details
    ISSN: 0271-2091
    Schlagwort(e): intake port ; dual intake ; CFD ; laser Doppler anemometry ; internal combustion engine ; cylinder ; turbulence ; steady flow ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The influence of intake port design on the flow field in a dual-intake valve engine was investigated using computational fluid dynamics, in order to study the effect of inlet port design on the in-cylinder flow. A detailed 3D computational grid incorporating all the features of the Ford Zetec production engine inlet ports, valves and cylinder head was initially created and the flow structure modelled at 5 and 10 mm valve lifts under steady flow conditions. Comparisons of computational results with experimental data obtained by laser Doppler anemometry indicate that the flow characteristics have been predicted well in most regions. Flow generated by different intake port designs was also simulated by introducing air into the cylinder at different directions to the inlet valve axes and the effects of port deactivation, throttling and exhaust gas recirculation were examined. The implications of the results for intake port design are discussed.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
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