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  • 1
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    Multi-messenger Observations of a Binary Neutron Star Merger (2017)
    Institute of Physics
    Details
    Publication Date: 2017-10-16
    Print ISSN: 2041-8205
    Electronic ISSN: 2041-8213
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    An optical supernova associated with the X-ray flash XRF 060218 (2006)
    [s.l.] : Nature Publishing Group
    Nature 442 (2006), S. 1011-1013 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Long-duration γ-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supernovae were not hitherto known to be associated with GRBs, and therefore GRB–supernovae were thought to be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05082
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray halos as a possible constraint on an intergalactic dust component
    Amsterdam : Elsevier
    Advances in Space Research 13 (1993), S. 327-330 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(93)90132-U
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  • 4
    Electronic Resource
    Electronic Resource
    The Rho Ophiuchi cloud — An overview (1986)
    Springer
    Astrophysics and space science 128 (1986), S. 135-149 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The relative short distance (∼165 pc) and considerable mass (≳2000M ⊙) of the Rho Ophiuchi cloud enable the study of the physical conditions within the cloud with a fine detail as it is reached in few complexes only. On the basis of the observations between 10−14 and 10−1 m wavelength, the most remarkable features of the cloud detected are: (1) The cloud represents one of the strongest detectable γ-ray sources for energies greater than 100 MeV. (2) X-ray observations gave no evidence that the cloud is interacting with a supernovae remnant or a neutron star what was supposed to account for the observed γ-ray flux. (3) Ultraviolet observations indicate that a considerable number of small particles is present toward the embedded star HD 147889 being placed at the edge of the cloud. (4) The ratio of total to selective extinction isR〉4 toward the denser regions of the cloud. (5) An embedded stellar cluster of about 50 stars was detected by four IR-surveys toward the central region of the cloud. (6) Far-IR observations indicate that there are only 3 B-stars within the cloud. The dust-temperature reaches locally 50 K. (7) More than 10 different molecular species were detected by ratio observations. A considerable depletion of heavy elements is observed. There are two dense regions within the cloud which are likely contracting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656025
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  • 5
    Electronic Resource
    Electronic Resource
    On the geometrical cross-section of an N-mer (1986)
    Springer
    Astrophysics and space science 128 (1986), S. 43-46 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have modeled the growth of an N-mer by means of Monte-Carlo calculations. The geometrical cross-section of the N-mer is measured and compared with the one obtained if one assumes that the N-mer is of spherical form. A difference up to a factor of 2 was found forN≤30.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656017
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  • 6
    Electronic Resource
    Electronic Resource
    Erratum (1987)
    Springer
    Astrophysics and space science 133 (1987), S. 411-411 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642500
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  • 7
    Electronic Resource
    Electronic Resource
    Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products (1999)
    Springer
    Applied physics 69 (1999), S. S487 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62; 61.80; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Single-pulse excimer-laser irradiation of poly-ethylene-terephthalate (PET) with fluences around and above the ablation threshold leads to the formation of surface dendrites. The lateral size and the number density of dendrites depend on the laser wavelength and the type and pressure of the ambient atmosphere. The results are discussed on the basis of excimer-laser-induced polymer fragmentation and the redeposition of ablation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051447
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  • 8
    Electronic Resource
    Electronic Resource
    Arylsulfatase activity of microbial biomass in soils as affected by cropping systems (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 46-54 
    Details
    ISSN: 1432-0789
    Keywords: Key words Arylsulfatase activity ; Chloroform-fumigation method ; Biomass enzymes ; Crop rotations ; N fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The impacts of crop rotations and N fertilization on different pools of arylsulfatase activity (total, intracellular, and extracellular) were studied in soils of two long-term field experiments in Iowa to assess the contibution of the microbial biomass to the activity of this enzyme. Surface-soil samples were taken in 1996 and 1997 in corn, soybeans, oats, or meadow (alfalfa) plots that received 0 or 180 kg N ha–1 before corn, and an annual application of 20 kg P ha–1 and 56 kg K ha–1. The arylsulfatase activity in the soils was assayed at optimal pH (acetate buffer, pH 5.8) before and after chloroform fumigation; microbial biomass C (Cmic) and N (Nmic) were determined by chloroform-fumigation methods. All pools of arylsulfatase activity in soils were significantly affected by crop rotation and plant cover at sampling time, but not by N fertilization. Generally, the highest total, intracellular, and extracellular arylsulfatase activities were obtained in soils under cereal-meadow rotations, taken under oats or meadow, and the lowest under continuous cropping systems.Total, intracellular, and extracellular arylsulfatase activities were significantly correlated with Cmic (r〉0.41, P〈0.01) and Nmic (r〉0.38, P〈0.01) in soils. The averages of specific activity values, i.e., of arylsulfatase activity of the microbial biomass, expressed per milligram Cmic, ranged from 315 to 407 μg p-nitrophenol h–1. The total arylsulfatase activity was significantly correlated with the intracellular activity, with r values 〉0.79 (P〈0.001). In general, about 45% of the total arylsulfatase activity was extracellular, and 55% was associated with the microbial biomass in soils, indicating the importance of the microflora as an enzyme source in soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050523
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  • 9
    Electronic Resource
    Electronic Resource
    Urease activity of microbial biomass in soils as affected by cropping systems (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 191-199 
    Details
    ISSN: 1432-0789
    Keywords: Key words Urease activity ; Chloroform fumigation method ; Crop rotations ; Intracellular enzyme activity ; Extracellular enzyme activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The impacts of crop rotations and N fertilization on different pools of urease activity were studied in soils of two long-term field experiments in Iowa; at the Northeast Research Center (NERC) and the Clarion-Webster Research Center (CWRC). Surface soil samples (0–15 cm) were taken in 1996 and 1997 in corn, soybeans, oats, or meadow (alfalfa) plots that received 0 or 180 kg N ha–1, applied as urea before corn and an annual application of 20 kg P and 56 kg K ha–1. The urease activity in the soils was assayed at optimal pH (THAM buffer, pH 9.0), with and without toluene treatment, in a chloroform-fumigated sample and its nonfumigated counterpart. The microbial biomass C (Cmic) and N (Nmic) were determined by chloroform fumigation methods. The total, intracellular, extracellular and specific urease activities in the soils of the NERC site were significantly affected by crop rotation, but not by N fertilization. Generally, the highest total urease activities were obtained in soils under 4-year oats–meadow rotations and the lowest under continuous corn. The higher total activities under multicropping systems were caused by a higher activity of both the intracellular and extracellular urease fractions. In contrast, the highest values for the specific urease activity, i.e. of urease activity of the microbial biomass, were found in soils under continuous soybean and the least under the 4-year rotations. Total and extracellular urease activities were significantly correlated with Cmic (r〉0.30* and 〉0.40**) and Nmic (r〉0.39** and 〉0.44**) in soils of the NERC and CWRC sites, respectively. Total urease activity was significantly correlated with the intracellular activity (r〉0.73***). About 46% of the total urease activity of the soils was associated with the microbial biomass, and 54% was extracellular in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050645
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  • 10
    Electronic Resource
    Electronic Resource
    Soil microbial biomass carbon and nitrogen as affected by cropping systems (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 200-210 
    Details
    ISSN: 1432-0789
    Keywords: Key words Crop rotation ; Organic carbon ; Organic nitrogen ; Long-term cropping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The impacts of crop rotations and N fertilization on microbial biomass C (Cmic) and N (Nmic) were studied in soils of two long-term field experiments initiated in 1978 at the Northeast Research Center (NERC) and in 1954 at the Clarion-Webster Research Center (CWRC), both in Iowa. Surface soil samples were taken in 1996 and 1997 from plots of corn (Zea mays L.), soybeans (Glycine max (L.) Merr.), oats (Avena sativa L.), or meadow (alfalfa) (Medicago sativa L.) that had received 0 or 180 kg N ha–1 before corn and an annual application of 20 kg P and 56 kg K ha–1. The Cmic and Nmic values were determined by the chloroform-fumigation-extraction method and the chloroform-fumigation-incubation method, respectively. The Cmic and Nmic values were significantly affected (P〈0.05) by crop rotation and plant cover at time of sampling, but not by N fertilization. In general, the highest Cmic and Nmic contents were found in the multicropping systems (4-year rotations) taken in oats or meadow plots, and the lowest values were found in continuous corn and soybean systems. On average, Cmic made up about 1.0% of the organic C (Corg), and Nmic contributed about 2.4% of the total N (Ntot) in soils at both sites and years of sampling. The Cmic values were significantly correlated with Corg contents (r≥0.41**), whereas the relationship between Cmic and Ntot was significant (r≤0.53***) only for the samples taken in 1996 at the NERC site. The Cmic : Nmic ratios were, on average, 4.3 and 6.4 in 1996, and 7.6 and 11.4 in 1997 at the NERC and CWRC sites, respectively. Crop rotation significantly (P〈0.05) affected this ratio only at the NERC site, and N fertilization showed no effect at either site. In general, multicropping systems resulted in greater Cmic : Corg (1.1%) and Nmic : Ntot (2.6%) ratios than monocropping systems (0.8% and 2.1%, respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050646
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