Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2005-2009
  • 1990-1994  (5)
  • 1975-1979
  • 1990  (5)
Source
Material
Years
  • 2005-2009
  • 1990-1994  (5)
  • 1975-1979
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Facular points and small-scale magnetic elements (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 9-16 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present spectroscopic observations, with high spatial resolution, of Caii K bright points very near the disc centre. Magnetic concentrations have been detected in these network (facular) points by only using intensity profiles of the well-known pair of lines Fei5250.22 Å and 5247.06 Å. No brightening of these structures with respect to the quiet photosphere can be ascertained within an accuracy threshold of 1.2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652637
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Velocity fields associated with the magnetic component of solar faculae (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 31-39 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The StokesV asymmetries observed in solar faculae can be interpreted by invoking the presence of magnetic and velocity fields variations along the line-of-sight. By means of a perturbative approach, we develop the theoretical dependence on magnetic and velocity fields of the StokesV profile around its zero-crossing point. We find that the empirical curves of growth for theV zero-crossing point and the slope, as well as the curve of growth for the integral (previously derived by Sánchez Almeidaet al., 1989, through the same approach), are reproduced quite well with a single atmosphere which assumes such simultaneous variations. The depth dependence of the fields that give the best fit in our model presents several striking properties which cannot be released without totally compromising the goodness of the fit. Namely, the magnetic field strength increases towards the observer while the downflowing velocity field decreases. Both variations must occur co-spatially, in the same atmospheric layers. This fact seems to contradict theoretical models for the fanning out parts of magnetic concentrations which foresee a sharp separation between a static magnetic layer and a deep zone with velocity fields. We discuss a possible solution of such contradiction in terms of a finite optical thickness of the boundary layer between zones with and without magnetic field in faculae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652640
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Numerical test of a newV-profile inversion technique (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 113-116 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The diagnostic method proposed by Landi Degl'Innocenti and Landolfi (1982), based on the observation of circular polarization, has been generalized to derive the thermodynamic properties of unresolved magnetic elements in the solar atmosphere. The final aim is to derive the height dependence of several parameters of the flux tube atmosphere (such as temperature, magnetic field and velocity distributions, macroturbulence and filling factor). We have used a perturbation method based on the concept of response functions for the Stokes profiles introduced by Landi Degl'Innocenti and Landi Degl'Innocenti (1977). We present here the preliminary results of invertingV-profiles by an iterative standard least-squares technique, which allows to find the magnetic 1-D atmosphere consistent with simulated data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652655
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Influence of produced acetic acid on growth of sulfate reducing bacteria (1990)
    Springer
    Biotechnology letters 12 (1990), S. 145-148 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A culture of SRB growing in lactate was incubated at different pH values in the range of 5.8 to 7.0. Highest growth rates were observed at pH 6.6. Under gás (H2S) stripping conditions the specific growth rate decreased with the undissociated acetic acid produced. An inhibition of SRB growth of 50% was observed for undissociated acetic acid concentrations of approximately 54 mg/L.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022432
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Modeling of immobilized cell reactor for propionic acid fermentation (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 36 (1990), S. 705-716 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mathematical model of steady state reactor behavior was developed, combining the tanks-in-series model with fermentation kinetic description. The model was tested with experimental data-from an immobilized cell reactor for propionic acid production operated under different residence times. In order to determine the effects of liquid flow rate and gas evolution on the degree of mixing, residence time distribution studies (RTDs) were performed during fermentation. The tanks-in-series model represented adequately the hydrodynamic behavior of the reactor. Association of an intrinsic kinetic model obtained from chemostat studies with the tanks-in-series model allows a “chemostat equivalent” cell concentration profile and a substrate consumption profile to be obtained. The advantage of having a two-level pH adjustment within the reactor is also discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260360708
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...