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  • Articles: DFG German National Licenses  (11)
  • 2000-2004  (3)
  • 1995-1999  (5)
  • 1980-1984  (3)
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  • Articles: DFG German National Licenses  (11)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Nanosecond radio bursts from strong plasma turbulence in the Crab pulsar (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 422 (2003), S. 141-143 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Crab pulsar was discovered by the occasional exceptionally bright radio pulses it emits, subsequently dubbed ‘giant’ pulses. Only two other pulsars are known to emit giant pulses. There is no satisfactory explanation for the occurrence of giant pulses, nor is there a complete ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01477
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quartz reflectivity and piezoelectricity (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 966-974 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It has been observed that the reflectivity of the (110) planes of a quartz lamina can be increased by submitting it to a static or alternating electric field. Measurements have been performed on 2.5 and 6 mm thick plates using a curved-crystal spectrometer with DuMond geometry. Photon energies were in the range 50 to 300 keV. Under the proper conditions, the increase in reflectivity is accompanied by negligible loss in resolution. The effects are explained by the occurrence of a quasi-mosaicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480001994
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Positron lifetimes for neutron-irradiated C $_{60}$ (1995)
    Springer
    Applied physics 61 (1995), S. 335-337 
    Details
    ISSN: 1432-0630
    Keywords: PACS61.80; 78.70
    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 neutron-irradiation effects on C $_{60}$ fullerite powder were studied by positron lifetime spectroscopy. Below 0.5 ns, a single lifetime of $382\pm1$ ps was found for the unirradiated annealed sample and two components were resolved after neutron irradiation with a dose of $2\times 10^{16}$ n/cm $^2$ . Possible origins of these components are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538200
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Positron lifetimes for neutron-irradiated C60 (1995)
    Springer
    Applied physics 61 (1995), S. 335-337 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 78.70
    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 neutron-irradiation effects on C60 fullerite powder were studied by positron lifetime spectroscopy. Below 0.5 ns, a single lifetime of 382±1 ps was found for the unirradiated annealed sample and two components were resolved after neutron irradiation with a dose of 2×1016 n/cm2. Possible origins of these components are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538200
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Respiratory findings in mail carriers (2000)
    Springer
    International archives of occupational and environmental health 73 (2000), S. 136-143 
    Details
    ISSN: 1432-1246
    Keywords: Key words Mail carriers ; Respiratory symptoms ; Ventilatory capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The results of the recording of respiratory symptoms and the measurement of lung function in 136 male postal workers employed as mail carriers were studied. In addition, the prevalence of chronic respiratory symptoms in 87 male nonexposed control workers was also examined. There was a significantly higher prevalence of chronic bronchitis (25.0%) and sinusitis (38.9%) in mail carriers than in control workers (13.8%; P 〈 0.05 and 2.3%; P 〈 0.01). A logistic regression analysis performed on the results of the study of chronic respiratory symptoms of mail carriers indicated a significant (P 〈 0.001) effect of smoking in this cohort, with the exception of occupational asthma. Mail carriers who smoked had a significantly higher prevalence of chronic cough (45.3%), chronic phlegm (39.1%), chronic bronchitis (39.1%) and sinusitis (53.1%) than mail carriers who were nonsmokers (18.1%; 12.5%; 12.5% and 26.4% respectively.) (P 〈 0.01). A high prevalence of acute symptoms developing during the work-shift was recorded, in both smokers and nonsmokers, being highest for upper airway symptoms, headache (50.0%), nasal catarrh (42.6%), and eye irritation (57.4%). The results of tests for average measured ventilatory capacity (as a percentage of predicted capacity) were significantly lower than expected, particularly for maximum flow rates at the last 25% of the vital capacity (FEF25), in both smokers (68.5%) and in nonsmokers (74.2%). A multivariate analysis of lung function parameters indicated a significant effect of employment conditions. The only major identifiable occupational exposure of mail carriers was to ambient air pollution for an average of 6 h per day as well as to adverse meteorological conditions. The measured ambient concentrations of major outdoor pollutants, primarily total suspended particulates, sulfur dioxide (SO2) and black smoke exceeded considerably the recommended Croatian maximum air quality standards over the past 10 years. Our study of mail carriers demonstrated that these workers were subject to respiratory symptoms associated with their smoking habits. Lung function findings suggested that occupational exposures, possibly to atmospheric pollution in combination with adverse meteorological conditions, may have led to lung function impairment in these workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004200050019
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Bewertung von Kompakt-Wärmeaustauschern (1980)
    Springer
    Heat and mass transfer 13 (1980), S. 205-215 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Zum Vergleich der Leistungsfähigkeit verschiedener Wärmeaustauscher liegt aus der Literatur eine Reihe von Bewertungskriterien vor. Sie beruhen im wesentlichen auf dem Verhältnis von erzielter Wärmeaustauschleistung zu der dafür erforderlichen hydraulischen Förderleistung. Die Anwendung dieser Kriterien wird beeinträchtigt durch nicht oder unklar formulierte Randbedingungen, die der Bewertung zugrunde liegen. Dies hat zu widersprüchlichen oder quantitativ zweifelhaften Ergebnissen geführt. Hier werden die Randbedingungen verschiedener Bewertungsverfahren gegenübergestellt, wobei die beiden Fragestellungen nach Flächenbedarf bei gleicher Wärme- und Förderleistung sowie Flächenbedarf und Förderleistung bei gleicher Wärmeleistung und Anströmfläche als die wichtigsten angesehen werden. Die erste Frage ist von Glaser bereits beantwortet worden, wird hier jedoch verallgemeinert dargestellt, die zweite Fragestellung ist neu; sie wird mit Hilfe geeigneter Kenngrößen und für einige bekannte Austauschsysteme behandelt.
    Notes: Abstract A number of criteria have been developed which evaluate heat exchangers on the basis of exchange rate and pumping power. Appreciation of these criteria suffers from a poor discussion of the conditions for which the evaluation holds. Consequently there have been contradictory results when different procedures were applied. A thorough discussion of the various boundary conditions reveals that two most important questions for crossflow air-cooled heat exchangers are (i) exchange area requirement at constant heat transfer rate and pumping power and (ii) exchange area and pumping power requirement at constant heat transfer rate and frontal area. The first question can be answered by generalizing the evaluation procedure of Glaser, the second problem is dealt with on the basis of redefined heat transfer and pressure drop characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433448
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Seasonal denitrification in flooded and exposed sediments from the Amazon floodplain at Lago Camaleão (1996)
    Springer
    Microbial ecology 32 (1996), S. 47-57 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Denitrification processes were measured by the acetylene-blockage technique under changing flood conditions along the aquatic/terrestrial transition zone on the Amazon floodplain at Lago Camaleão, near Manaus, Brazil. In flooded sediments, denitrification was recorded after the amendment with NO 3 − (100 μmol liter−1) throughout the whole study period from August 1992 to February 1993. It ranged from 192.3 to 640.7 μmol N m−2 h−1 in the 0- to 5-cm sediment layer. Without substrate amendment, denitrification was detected only during low water in November and December 1992, when it occurred at a rate of up to 12.2 μmol N m−2 h−1 Higher rates of denitrification at an average rate of 73.3 μmol N m−2 h−1 were measured in sediments from the shallow lake basin that were exposed to air at low water. N2O evolution was never detected in flooded sediments, but in exposed sediments, it was detected at an average rate of 28.3 μmol N m−2 h−1 during the low-water period. The results indicate that under natural conditions there is denitrification and hence a loss in nitrogen from the Amazon floodplain to the atmosphere. Rates of denitrification in flooded sediments were one to two orders of magnitude smaller than in temperate regions. However, the nitrogen removal of exposed sediments exceeded that of undisturbed wetland soils of temperate regions, indicating a considerable impact of the flood pulse on the gaseous turnover of nitrogen in the Amazon floodplain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170106
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Seasonal Denitrification in Flooded and Exposed Sediments from the Amazon Floodplain at Lago Camaleão (1996)
    Springer
    Microbial ecology 32 (1996), S. 47-57 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Denitrification processes were measured by the acetylene-blockage technique under changing flood conditions along the aquatic/terrestrial transition zone on the Amazon floodplain at Lago Camaleão, near Manaus, Brazil. In flooded sediments, denitrification was recorded after the amendment with NO3 − (100 μmol liter−1) throughout the whole study period from August 1992 to February 1993. It ranged from 192.3 to 640.7 μmol N m−2 h−1 in the 0- to 5-cm sediment layer. Without substrate amendment, denitrification was detected only during low water in November and December 1992, when it occurred at a rate of up to 12.2 μmol N m−2 h−1. Higher rates of denitrification at an average rate of 73.3 μmol N m−2 h−1 were measured in sediments from the shallow lake basin that were exposed to air at low water. N2O evolution was never detected in flooded sediments, but in exposed sediments, it was detected at an average rate of 28.3 μmol N m−2 h−1 during the low-water period. The results indicate that under natural conditions there is denitrification and hence a loss in nitrogen from the Amazon floodplain to the atmosphere. Rates of denitrification in flooded sediments were one to two orders of magnitude smaller than in temperate regions. However, the nitrogen removal of exposed sediments exceeded that of undisturbed wetland soils of temperate regions, indicating a considerable impact of the flood pulse on the gaseous turnover of nitrogen in the Amazon floodplain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170106
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Short-term temporal variation in population structure of two harpacticoid copepods, Zausodes arenicolus and Paradactylopodia brevicornis (1984)
    Springer
    Marine biology 84 (1984), S. 53-63 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aspects of the population biology of two harpacticoid copepod species [Zausodes arenicolus Wilson and Paradactylopodia brevicornis (Claus)] living in Tampa Bay, Florida, USA, were studied on time scales of hours to days during November 1983. Fluctuations in population agestructure, adult sex-ratio, and proportion of ovigerous females were determined for these two species in a control plot and in an experimental plot defaunated by raking. For both species, immigrants into the defaunated plot differed significantly from conspecifics in the control plot in all characteristics examined. The disturbed plot contained a larger proportion of young juveniles of both species compared to the unmanipulated site after 4 h but not after 8 h. In Z. arenicolus, adult males returned to the experimental plot more quickly than adult females. For both species, rapid and significant changes in population age-structure, adult sex-ratio, and the proportion of adult females with eggs occurred within the control plot. It is suggested that this variation was too large and occurred too rapidly to be accounted for solely by in situ processes in the absence of large-scale immigration and/or emigration of individuals. Potential implications of these results for population studies of harpacticoid copepods and other benthic invertebrates are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394527
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Study ofD *+ and search forD **0 production by neutrinos in BEBC (1995)
    Springer
    The European physical journal 68 (1995), S. 43-46 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data from BEBC experiments are combined to provide large statistics for neutrino interactions. ChargedD * mesons are produced in (1.22±0.25)% of neutrino and (1.01±0.31)% of antineutrino charged current interactions. The mean fraction of the hadronic laboratory energy taken by theD *+ in these events is 0.59±0.03±0.08. Less than 18% of all chargedD * mesons from (anti)neutrino interactions are found to be daughters ofD **0 (at the 90% confidence level).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579803
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