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  • 11
    Electronic Resource
    Electronic Resource
    Growth simulation of Hansenula polymorpha (1981)
    Springer
    Applied microbiology and biotechnology 13 (1981), S. 90-95 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Cultivation of Hansenula polymorpha with substrate ethanol in a bench-scale tower loop reactor was simulated by means of a distributed parameter model with regard to the dissolved oxygen and substrate in the medium, oxygen and CO2 in the gas phase, and a lumped parameter model with regard to the cell mass. Space and time independence of the substrate and oxygen limiting constants of the Monod model, KS and KO, was assumed. Time variations of the yield coefficients, YX/S and YX/O, were allowed for.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00499694
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  • 12
    Electronic Resource
    Electronic Resource
    Growth simulation ofHansenula polymorpha (1981)
    Springer
    Applied microbiology and biotechnology 13 (1981), S. 145-150 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Using the model presented in part I, the measured time and spacial variations of process variables were simulated with satisfactory accuracy. Especially the experimentally found minima of the longitudinal dissolved oxygen concentration profiles in the substrate limiting growth range, which are caused by the transition from oxygen transfer limited to substrate limited growth along the tower, can be simulated with great accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703043
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  • 13
    Electronic Resource
    Electronic Resource
    Spatio-temporal structure formation and self-diffraction in CdS using laser-induced thermal gratings (1991)
    Springer
    Applied physics 52 (1991), S. 255-260 
    Details
    ISSN: 1432-0630
    Keywords: 78.20Nv ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The semiconductor CdS is well known to show various kinds of photo-thermal and photo-electric optical nonlinearities. We present here to our knowledge first results of spatiotemporal structure formation using laser-induced thermal gratings in CdS. By the means of an optical multi-channel analyzer the spatial resolution of transverse dynamic switching processes was observed directly. Spatially and time resolved self-diffracted signals were measured in the far-field. The experimental results agree very well with calculations obtained by solving the heat-flow equation and using a fast Fourier transformation. The calculations verify the experimental parameters, in particular the thermal diffusivity D≈0.1 cm2/s at room temperature. To obtain a better transverse structuring, CdS samples were also investigated which were fixed on a sapphire substrate for longitudinal heat sinking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324587
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  • 14
    Electronic Resource
    Electronic Resource
    Growth of Chaetomium cellulolyticum on glucose substrate (1985)
    Springer
    Applied microbiology and biotechnology 21 (1985), S. 299-308 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The batch cultivation of Chaetomium cellulyticum on glucose was described by a structured model based on the experimental investigations of Hecht et al. (1982) and Rosen (1982). The Monod model did not give satisfactory results. The structured model takes into account the adaptation of the transport system of cells to the substrate supply. The model parameters identified are presented. The agreement between calculated and measured courses of cell growth is excellent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252708
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  • 15
    Electronic Resource
    Electronic Resource
    Dynamics of growth in batch and continuous cultures of Saccharomyces cerevisiae during shifts from aerobiosis to anaerobiosis and reverse (1984)
    Springer
    Applied microbiology and biotechnology 19 (1984), S. 353-357 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Saccharomyces cerevisiae H 1022 was cultivated in batch and continuous culture on a glucose substrate. The yeast was subjected to a sudden change from aerobic to anaerobic growth conditions by switching the inlet-gas stream from air to dinitrogen. The dynamics of growth and product formation during the periods of adaptation were studied. A structured growth model based on Monod-Blackman-kinetics was applied to simulate these shift-experiments. The immediate switch of the yeast to maximum anaerobic growth and ethanol production predicted by this model was confirmed very well in the chemostat-experiments. However, a slow adaptation was evident for the switch from anaerobiosis back to aerobiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253784
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  • 16
    Electronic Resource
    Electronic Resource
    A multiple-reflection cell suited for absorption measurements in shock tubes (1994)
    Springer
    Shock waves 4 (1994), S. 51-53 
    Details
    ISSN: 1432-2153
    Keywords: Chemical kinetics ; Detection sensitivity ; Multiple-reflection cell ; UV absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The improvement of the detection limit in optical concentration measurements by means of multiple-reflection cells (MRC) has become a well established method in absorption spectroscopy. To apply such an experimental method to shock tubes, several technical problems have to be solved. The use of special optical cells showing mechanical ruggedness is required. In this report we present such a MRC designed for a cylindrical shock tube with an inner diameter of 100 mm. By means of 8 mirrors (optical coated stainless steel) the absorption length has been increased by almost one order of magnitude (863 mm) while the optical path is kept in one plane. The use of fixed flat mirrors provides a very high mechanical stability, which facilitates the application to shock tubes. The first experimental results with this MRC were obtained by measuring the thermal decomposition of O3 behind incident shock waves using an UV laser beam. A direct comparison to the signals simultaneously detected by the use of the conventional absorption length (i.e. the tube diameter of 100 mm) documents the suitability of this MRC for applications in chemical kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414633
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  • 17
    Electronic Resource
    Electronic Resource
    Damping of a Yukawa fermion at finite temperature (1995)
    Springer
    The European physical journal 66 (1995), S. 491-494 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The damping of a massless fermion coupled to a massless scalar particle at finite temperature is considered using the Braaten-Pisarski resummation technique. First the hard thermal loop diagrams of this theory are extracted and effective Green's functions are constructed. Using these effective Green's functions the damping rate of a soft Yukawa fermion is calculated. This rate provides the simplest example for the damping of a soft particle. To leading order it is proportional tog 2 T, whereas the one of a hard fermion is of higher order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01556376
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  • 18
    Electronic Resource
    Electronic Resource
    The sub-Coulomb197Au(t, d)198Au reaction (1989)
    Springer
    The European physical journal 334 (1989), S. 293-297 
    Details
    ISSN: 1434-601X
    Keywords: 25.55.Fm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of a deformation of the triton due to a non-s part of the ground state wave function on triton induced reactions is investigated. For this purpose, a measurement of the absolute cross section of the197Au(t, d)198Au reaction below 7 MeV was performed and compared with a finite range DWBA calculation. Implications on reactions with tritons during the primordial nucleosynthesis are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284557
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  • 19
    Electronic Resource
    Electronic Resource
    Connected Green function approach to symmetry breaking inΦ 1+1 4 -theory (1995)
    Springer
    The European physical journal 353 (1995), S. 301-310 
    Details
    ISSN: 1434-601X
    Keywords: 11.30.Qc ; 11.90.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connected functions higher than 4 th order for theλΦ 4-theory in 1 + 1 dimensions. We apply the equations to the investigation of spontaneous symmetry breaking, i.e. to the evaluation of the effective potential at temperatureT=0. Within our momentum space discretization we obtain a second order phase transition (in agreement with the Simon-Griffith theorem) and a critical coupling ofλ crit /4m 2=2.446 as compared to a first order phase transition andλ crit /4m 2=2.568 from the Gaussian effective potential approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292336
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  • 20
    Electronic Resource
    Electronic Resource
    The realizations of the Lie algebraG 2 (1993)
    Springer
    Czechoslovak journal of physics 43 (1993), S. 697-703 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we apply a previously published method [1] to the construction of boson realizations for Lie algebraG 2. These realizations are expressed by means of certain recurrent formulae in terms of five Bose pairs and generators of the subalgebrasl(2, R).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01607580
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