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  • 1
    Call number: 4/G 5875
    Type of Medium: Monograph available for loan
    Pages: XV, 273 S. : graph. Darst.
    ISBN: 9027705046
    Series Statement: NATO Advanced Study Institutes series : Series C, Mathematical and physical sciences 12
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2019-07-17
    Description: MGS TES data is used at high resolution to map small regions of basalt in Mars' northern hemisphere. With the exception of 2 outliers, the northern extent of the highland basalt appears to correspond with the northern edge of the cratered highlands. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXII; LPI-Contrib-1080
    Format: text
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  • 3
    Publication Date: 2012-08-31
    Description: Author(s): P. Naselsky, C. H. Christensen, P. R. Christensen, P. H. Damgaard, A. Frejsel, J. J. Gaardhøje, A. Hansen, M. Hansen, J. Kim, O. Verkhodanov, and U. A. Wiedemann We discuss opportunities that may arise from subjecting high-multiplicity events in relativistic heavy ion collisions to an analysis similar to the one used in cosmology for the study of fluctuations of the cosmic microwave background (CMB). To this end, we discuss examples of how pertinent features... [Phys. Rev. C 86, 024916] Published Thu Aug 30, 2012
    Keywords: Relativistic Nuclear Collisions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
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  • 4
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; New bonded phases ; 13C and29Si CP-MAS NMR ; DRIFT ; ESCA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A variety of olefins were bonded to silaceous supports through a hydride modified substrate. The products were then examined by13C and29Si solid state-NMR with cross-polarization (CP) and magic angle spinning (MAS). Information about the surface was also obtained by diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) and the related photoelectron spectroscopic technique (ESCA). Carbon analysis on bonded silicas was carried out and surface coverage was calculated. Confirmation of the organic groups bound to the silica support was possible. The hydride intermediate is shown to be a versatile material for bonding a wide variety of organic moieties to silica surfaces.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0029-5981
    Keywords: contact ; friction ; complementarity ; Newton's method ; interior point method ; finite elements ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents two algorithms for solving the discrete, quasi-static, small-displacement, linear elastic, contact problem with Coulomb friction. The algorithms are adoptions of a Newton method for solving B-differentiable equations and an interior point method for solving smooth, constrained equations. For the application of the former method, the contact problem is formulated as a system of B-differentiable equations involving the projection operator onto sets with simple structure; for the application of the latter method, the contact problem is formulated as a system of smooth equations involving complementarity conditions and with the non-negativity of variables treated as constraints. The two algorithms are numerically tested for two-dimensional problems containing up to 100 contact nodes and up to 100 time increments. Results show that at the present stage of development, the Newton method is superior both in robustness and speed. Additional comparison is made with a commercial finite element code. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In situ, quantitative infrared spectrometry has been used to measure the evolution of carbon dioxide during the photo-degradation of pigmented and unpigmented acrylic-emulsion paint films. It is demonstrated that the method permits a fast and convenient way of assessing the resistance of such paints to UV degradation. However, it is also shown that valid comparisons of paints prepared with different grades of titanium dioxide, but with the same acrylic emulsion, require careful selection and control of the experimental conditions. Thus, the relative importance of (a) direct photochemical oxidation of the binder and (b) indirect photo-catalysed oxidation (mediated by titanium dioxide) depend not only on the spectral distribution of the radiation source, particularly the output between 300 and 400 nm, but also on the humidity of the ambient atmosphere. The increased rate of oxidation with increased humidity is not unexpected, but the size of the effect is unexpectedly high. In addition, there is some carbon dioxide formation during irradiation of the paint film in nitrogen and further investigation of this phenomenon is in hand. For both pigmented and unpigmented films, the rate of carbon dioxide evolution is sensitive to the film thickness. The dependence of the oxidation rate on the thickness of clear, unpigmented films is consistent with the measured UV absorption. However, for pigmented films, this dependence extends over greater film thicknesses than predicted by a simple model based on paint film optics.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper reports the application of a previously described i.r. spectrometric method, which measures the evolution of carbon dioxide, and hence the rate of photo-oxidation, caused by UV irradiation of paint films, to a study of the dependence of paint degradation on UV wavelength. Measurements have been made on both unpigmented and TiO2-pigmented acrylic films. Preliminary measurements demonstrate that, for both pigmented and unpigmented acrylic films, the rate of carbon dioxide generation is proportional to I 0.5, the square root of the UV intensity. As the rate of carbon dioxide generation is a measure of paint film degradation, this implies that the rate of film degradation is proportional to the square root of UV intensity. This is the first time that this square root dependence, previously predicted from photo-oxidation studies of model compounds, has been directly measured on a practical paint film. Photo-oxidation of unpigmented, anatase-pigmented and rutile-pigmented acrylic films has been measured by using optical filters to isolated selected portions of the output of a Xenon lamp. Results have been analyzed semi-quantitatively taking into account the measured transmission characteristics of the filters, the lamp output and the I 0.5 relationship. The disproportionate deleterious effects of short wavelength, 〈300 nm, radiation on unpigmented films have been confirmed and the stability of anatase pigmented films to 405 nm radiation has been demonstrated directly. The FTIR assay of carbon dioxide produced by paint film degradation could be applied to other polymer films and combined with measurements of carbonyl band development.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Preliminary results are presented on the photochemical and photoelectrochemical degradation of aqueous organic solutions by anodic, thermal and sol–gel TiO2 films. The films were tested in a photochemical falling film reactor, and a photochemical/photoelectrochemical vortex reactor, and preliminary results are presented on the degradation of a range of model organics using these reactors. The former showed the best mass transport characteristics and most efficient light usage, whilst the latter reactor clearly showed the efficacy of the electric field enhancement effect. The results on the vortex reactor effectively represent a proof-of-concept of the electric field enhancement approach in large scale photoelectrochemical reactors. From time to time it is necessary to recoat the substrates, and the importance of the procedure adopted to remove ’old‘ TiO2 films prior to the fabrication of ‘new’ films is highlighted, as well as the mode of operation of the sol–gel films, and problems encountered in reactor design.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of carefully reduced carbon-supported iron catalysts show superparamagnetic α-Fe at 80 K. The results indicate that the particle size depends on the reduction temperature. Effects of evacuation and CO chemisorption are discussed.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1617-4623
    Keywords: Key wordsSchizosaccharomyces pombe ; M-factor ; Pheromone ; ABC protein ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the fission yeast Schizosaccharomyces pombe, cells of opposite mating type communicate via diffusible peptide pheromones prior to mating. We have cloned the S. pombe mam1 gene, which encodes a 1336-amino acid protein belonging to the ATP-binding cassette (ABC) superfamily. The mam1 gene is only expressed in M cells and the gene product is responsible for the secretion of the mating pheromone, M-factor, a nonapeptide that is S-farnesylated and carboxy-methylated on its C-terminal cysteine residue. The predicted Mam1 protein is highly homologous to mammalian multiple drug-resistance proteins and to the Saccharomyces cerevisiae STE6 gene product, which mediates export of a-factor mating pheromone. We show that STE6 can also mediate secretion of M-factor in S. pombe.
    Type of Medium: Electronic Resource
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