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  • 1
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Springer
    Call number: PIK M 311-02-0229
    Type of Medium: Monograph available for loan
    Pages: XIII, 307 p.
    ISBN: 0387988556
    Series Statement: Institute for nonlinear science ;
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Publication Date: 2019-07-17
    Description: In this paper we demonstrate the utility of the Polar Ozone and Aerosol Measurement (POAM)III data for providing semiglobal three-dimensional ozone fields during the Stratospheric Aerosoland Gas Experiment (SAGE) III Ozone Loss and Validation Experiment (SOLVE) winter. As asolar occultation instrument, POAM III measurements were limited to latitudes of 63°N to 68°Nduring the SOLVE campaign but covered a wide range of potential vorticity. Using establishedmapping techniques, we have used the relation between potential vorticity and ozone measured byPOAM III to calculate three-dimensional ozone mixing ratio fields throughout the NorthernHemisphere on a daily basis during the 1999/2000 winter. To validate the results, we haveextensively compared profiles obtained from ozonesondes and the Halogen Occultation Experimentto the proxy O3 interpolated horizontally and vertically to the correlative measurement locations. Onaverage, the proxy O3 agrees with the correlative observations to better than ~5%, at potentialtemperatures below about 900 K and latitudes above about 30°N, demonstrating the reliability ofthe reconstructed O3 fields in these regions. We discuss the application of the POAM proxy ozoneprofiles for calculating photolysis rates along the ER-2 and DC-8 flight tracks during the SOLVEcampaign, and we present a qualitative picture of the evolution of polar stratospheric ozonethroughout the winter.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 10925-10933 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We consider the kinetics of the two-dimensional, stoichiometric A+B→0 reaction under external flows, for which we use two models: First a steady flow, which consists of an array of eddies; second a time-dependent, stochastic flow which mimics turbulent fluid motion. We follow the reaction numerically and detect in both situations complex decay patterns, which obey different power-laws at short, intermediate and long times: While the initial stage of the reaction is dominated by mixing, c(t)∝t−1, the long-time behavior shows fluctuation-dominated kinetics, c(t)∝t−1/2. In the case of the eddy-lattice-flow a very slow intermediate regime, with c(t)∝t−1/4, emerges. This regime is explained in the framework of an analytical model for mixing along closed-flow lines. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 1078-1084 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an analytical scheme, easily implemented numerically, to generate synthetic Gaussian turbulent flows by using a linear Langevin equation, where the noise term acts as a stochastic stirring force. The characteristic parameters of the velocity field are well introduced, in particular the kinematic viscosity and the spectrum of energy. As an application, the diffusion of a passive scalar is studied for two different energy spectra. Numerical results are compared favorably with analytical calculations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 64 (1995), S. 58-68 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 378 (1995), S. 241-241 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - It is generally accepted that sculptures or objets d'art are useless from the scientific point of view. We would like to show here an example of a certain type of sculpture that is of scientific relevance, and which can be related to the recent discovery of the so-called photonic band-gap ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1041
    Keywords: Key words Deflazacort ; Prednisone ; Glucose tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: To compare the diabetogenic effects of deflazacort (D) versus prednisone (PN) using a dosage ratio of 1.5 mg deflazacort:1 mg prednisone. Methods: Thirty-three patients suffering from various active connective tissue or chronic inflammatory diseases were randomized to be treated with D or PN, assuming a therapeutic equipotency ratio of 1.5 mg D:1 mg PN. Neither dosage nor glucocorticoid employed were modified during the study. Patients had not received steroid treatment during the month prior to their inclusion date. Fasting glucose, glycosilated haemoglobin and fructosamine were determined before and after 1 month of treatment. Non-diabetic patients were also submitted to an oral glucose tolerance test (OGTT) at entry and after 1 month. Results were compared by univariate, and multivariate tests to correct the effects of age, body mass index and diagnosis. Results: After 1 month of treatment there were no differences between D and PN in fasting glucose, glycosilated haemoglobin, or fructosamine. OGTT performed after treatment showed similar glucose values for both treatment groups. Patients treated with D had insulin levels at min 60 of the post-treatment OGTT which were higher than those treated with PN [114.1 (62.8) mcUI · ml−1 versus 73.5 (32.7) mcUI · ml−1, P = 0.049], but the difference lost its statistical significance in the multivariate analysis. Conclusion: D and PN have similar effects on glucose tolerance when an equipotency ratio of 1.5 mg D:1 mg PN is employed. Previous studies employing a ratio of 1.2:1 mg may have understimated the adverse effects of D on glucose metabolism.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The transient dynamics of a single-mode semiconductor laser subjected to both weak optical feedback and light injection is studied. Even at detuning values for which injection locking is not effective, turn-on jitter and frequency jitter can still be strongly reduced by adjusting either the length of the external cavity or the detuning.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; On-line trace-enrichment ; Environmental water samples ; Trace carbaryl analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A fully automated method, based on on-line solid phase extraction (SPE) then liquid chromatography with diode-array and fluorescence detection, has been developed for the trace-level determination of carbaryl and 1-naphthol, its primary transformation product, in environmental water samples. By means of rapid enrichment on a 30 mm×4 mm i.d. 10-μm ODS pre-column, using a 10-mL water sample, before LC determination both compounds were recovered satisfactorily from different environmental water samples spiked at various concentrations (0.05–10 μg L−1). Average recoveries were between 93 and 102% with coefficients of variation between 1 and 4%; detection limits as low as 10 and 50 mg L−1 (ppt) were estimated for carbaryl and 1-naphthol, respectively. With this small sample volume, sample throughput was up to 30 samples per day. A carbaryl degradation study was performed by spiking a surface-water sample at 2 μg L−1. After 15 days 80% of the carbaryl was degraded and the presence of 1-naphthol was confirmed by means of its UV spectrum.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The autochthonous microbiota from a granitic aquifer in Spain were studied. Several bacterial strains were isolated and identified. The major components of the microbiota were Pseudomonas-like strains, Flavobacterium, Acinetobacter, and Alcaligenes. The variation in the number of microorganisms after the bottling process was studied. The initial bacterial population increased over the first 5 days after bottling. This increase was higher in samples from polyvinyl chloride bottles. Sonication usually increased the total cell counts. As expected, most of the autochthonous microbiota were not detected in the viable cell counts.
    Type of Medium: Electronic Resource
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