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  • Springer  (15)
  • National Academy of Sciences  (3)
  • Blackwell Publishing Ltd  (2)
  • EMBO Press
  • 1995-1999  (20)
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Keywords
Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Diagenetic evolution of the Carnian Wetterstein platforms of the Eastern Alps (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 42 (1995), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The carbonate platforms of the Wetterstein Formation of the Eastern Alps (Drau Range and Northern Calcareous Alps) show a distinct facies zonation of reefs and lagoons. While some lagoonal areas were episodically emerged and formed lagoonal islands, others remained permanently flooded. The scale of near surface, meteoric or marine diagenesis was related to this lagoonal topography. At shallow burial depth, cementation was dominated by altered marine solutions, which additionally caused recrystallization of metastable constituents of the sediment and earlier marine cements (high magnesian calcite, aragonite) connected with a carbon and oxygen isotopic change to more negative values.Deeper burial cementation shows a succession with two types of saddle dolomite and three types of blocky calcite. Carbon and oxygen isotopic values of these cements show a trend towards more negative values from the first to the last generation, in the following succession: clear saddle dolomite—zoned blocky calcite—cloudy saddle dolomite—post-corrosion blocky calcite—replacive blocky calcite. Fluid inclusion studies of the carbonate cements are interpreted to indicate a deeper burial temperature development that first increases from 175 to 317°C, followed by a temperature decrease to 163–260°C, and subsequent increase up to 316°C, whereby the samples of the Drau Range always show the lowest values. Calculations of the isotopic composition of the water, from which the carbonate cements were precipitated, yielded positive δ18O values from 6.66 to 17.81%o (SMOW), which are characteristic for formation and/or metamorphic waters. Also, the isotopic compositions of the palaeofluids probably changed during deeper burial diagenesis, following the temperature development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1995.tb02099.x
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of Cloned Somatostatin Receptor Subtypes Localization of Rat SSTRs in Gastrointestinal Tissues, SSTR1 Gene Promoter Studies, and Mutational Analyses of SSTR3 (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 805 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb17527.x
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  • 3
    Electronic Resource
    Electronic Resource
    Detection of formaldehyde using mid-infrared difference-frequency generation (1997)
    Springer
    Applied physics 65 (1997), S. 771-774 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 7:65; 33:00; 42.60; 42.65; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 3 (PPLN) is reported. Minimum detectable concentration of 30 ppb was achieved with a compact, portable room-temperature gas sensor configured for formaldehyde (H2CO) detection. This sensitivity, coupled with high selectivity and long term stability, is sufficient for various environmental applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050344
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  • 4
    Electronic Resource
    Electronic Resource
    Real-time measurements of trace gases using a compact difference-frequency-based sensor operating at 3.5 μm (1998)
    Springer
    Applied physics 67 (1998), S. 339-345 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 07.88.+y; 42.62.Fi; 42.65.-k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 3 for on-line absorption measurements of H2CO, CH4, and H2O near 3.5 μm is reported. Formaldehyde levels of 30 ppb, corresponding to absorptions of 2×10-4 have been measured using absorption spectroscopy. In this paper we report specifically the performance of this sensor as part of the 1997 Lunar–Mars Life Support Test program at the NASA Johnson Space Center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050513
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  • 5
    Electronic Resource
    Electronic Resource
    Compact mid-infrared trace gas sensor based on difference-frequency generation of two diode lasers in periodically poled LiNbO3 (1998)
    Springer
    Applied physics 67 (1998), S. 347-350 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 7.65; 42.60B; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 3 (PPLN) crystal pumped by two single-frequency diode lasers. A maximum DFG power of 1.6 μW at 3.6 μm was generated with a pump power of 61.4 mW at 832 nm and a signal power of 41.5 mW at 1083 nm incident on a 19-mm-long PPLN crystal, which corresponds to a conversion efficiency of 335 μW W-2 cm-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050514
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  • 6
    Electronic Resource
    Electronic Resource
    Portable fiber-coupled diode-laser-based sensor for multiple trace gas detection (1999)
    Springer
    Applied physics 69 (1999), S. 459-465 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.62 Fi; 33.20 Ea; 42.60 By
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Tunable narrowband mid-infrared radiation from 3.25 to 4.4 μm is generated by a compact fiber-coupled, difference-frequency-based spectrosopic source. A 20-mW external cavity diode laser (with a tuning range from 814 to 870 nm) and a 50-mW distributed-Bragg-reflector diode-laser-seeded ytterbium-doped fiber amplifier operating at 1083 nm are difference-frequency mixed in a multi-grating, temperature-controlled periodically poled LiNbO3 crystal. A conversion efficiency of 0.44 mW/(W2 cm) (corresponding to a power of ≈3 μW at 3.3 μm) represents the highest conversion efficiency reported for a portable device. Performance characteristics of such a sensor and its application to spectroscopic detection of CO2, N2O, H2CO, HCl, NO2, and CH4 will be reported in this work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050835
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  • 7
    Electronic Resource
    Electronic Resource
    Mycorrhizal relationships in bottomland hardwood forests of the southern United States (1996)
    Springer
    Wetlands ecology and management 4 (1996), S. 223-233 
    Details
    ISSN: 1572-9834
    Keywords: bottomland hardwoods ; ectomycorrhizae (EM) ; endomycorrhizae ; mycorrhizae ; vesiculararbuscular mycorrhizae (VAM)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mycorrhizae are important in the functioning of forest ecosystems worldwide, and play a critical role in water uptake, nutrient acquisition, and prevention of feeder root disease. The majority of mycorrhizal research has been conducted on upland sites, especially in coniferous ecosystems and in commercial agricultural production. However, the maintenance and restoration of bottomland hardwood (BLH) forest ecosystems in the southern United States is of increasing concern. Both ectomycorrhizae and endomycorrhizae are present in BLH forests, although the dominance of one or the other type depends primarily on both the tree species and the hydrologic regime. Ectomycorrhizae tend to be more sensitive to flooding, while endomycorrhizal infection can be present even in permanently flooded soils. The mycorrhizae of sweetgum (Liquidambar styraciflua), green ash (Fraxinus pennsylvanica), and the oaks (Quercus spp.) have been studied most due to their economic importance. Considerable work is still needed to better understand mycorrhizal relationships in BLH ecosystems and associated trees, both with respect to infectivity and nutrient cycling. Such information may be necessary for restoration of BLH forests on old agricultural fields, or to maintain the productivity of BLH forests after harvest. This paper summarizes studies on mycorrhizae relationships in BLH forests and suggests future work necessary for understanding the role mycorrhizae can have in managing these ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02150536
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  • 8
    Electronic Resource
    Electronic Resource
    Boson peak and fast relaxation process near the glass transition in polystyrene (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 413-420 
    Details
    ISSN: 1435-1536
    Keywords: Polymers ; glass transition ; neutron scattering ; polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Atactic polystyrene, both side group and main chain deuterated, was investigated by inelastic neutron scattering in a wide temperature range around the glass transition from 2 to 450 K. In the glass the Boson peak position is only very weakly influenced by the deuteration of the phenyl group. In the neighborhood of the glass transition temperatureT g we find a fast relaxation process similar to other glasses. The onset of the fast relaxation in polystyrene, however, is observed already at temperaturesT g — 200 K. Results from partially deuterated polystyrene suggest a change of the phenyl ring dynamics already far belowT g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656884
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamical aspects of self-organized (macro) molecular systems investigated by neutron spin-echo spectroscopy (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 112-117 
    Details
    ISSN: 1435-1536
    Keywords: Neutron spin-echo ; relaxation dynamics ; molecular aggregates ; microemulsions ; block copolymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Neutron spin-echo (NSE) spectroscopy is a tool to close the gap between light scattering and more conventional neutron spectroscopies. It may also be viewed as an augmentation of small-angle scattering with inelastic, dynamical information. Using a microemulsion system as example for a system of molecular aggregates and a block-copolymer system forming macromolecular aggregates, it is shown what type of dynamics is observable by NSE-spectroscopy. The lamellar phase of a SDS-pentanol-water microemulsion allows for the investigation of different layer modes (undulation, peristaltic mode) the dynamics of which are determined by elastic properties of the interface layers and by the friction due to fluid flow between the layers. Platelet-like aggregates of polyethylene-polyethylenebutylene (PE-PEP) copolymers formed upon cooling a decane solution exhibit a polymeric brush of PEP-hairs on their surface. The fluctuation dynamics of this brush determined by a balance of solvent friction and entropie restoring forces has been observed by NSE spectroscopy. Besides, the direct dynamical information the NSE data allow for the separation of static scattering due to the average structure from the scattering contributions due to mobile fluctuating parts of the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189503
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  • 10
    Electronic Resource
    Electronic Resource
    On the dynamics of polymers in dense systems – Results of neutron spin echo spectroscopy (1997)
    Springer
    Hyperfine interactions 106 (1997), S. 3-18 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract One of the basic problems in the dynamics of polymers concerns the importance of geometrical or topological interactions which are directly related to the large scale molecular structures. In the famous reptation model these constraints are pictured in terms of a tube of localization following the average chain profile and confining the chain motion to the curve‐linear tube. Recently studying the dynamic structure factor of a single labeled chain in a polymer melt by means of neutron spin echo spectroscopy (NSE) led to a direct observation of these tube constraints. Here I shall summarize these neutron spin echo experiments. I shall address the NSE technique, present results on the entropy driven segmental chain dynamics, discuss the dynamics of single chains in the melt where the chain length is increased through the transition to “reptation” dynamics and display NSE measurements on long chain systems which revealed the molecular existence of the entanglement distance. Their magnitudes agree very well with tube diameters derived from dynamical mechanical measurements on the basis of the reptation model proving thereby the basic assumption of this Nobel Price winning concept.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012624631098
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