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  • 2000-2004  (189)
  • 1990-1994  (24)
  • 1975-1979  (11)
  • 1970-1974  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Significance of metal complexing agents in secondary sewage effluents (1970)
    s.l. : American Chemical Society
    Environmental science & technology 4 (1970), S. 520-521 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60041a006
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  • 2
    Electronic Resource
    Electronic Resource
    Electrically induced dynamic processes in nematic liquid crystals: 1H nuclear magnetic resonance investigations (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 2430-2439 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The director reorientation of some nematic liquid crystals in the presence of both magnetic and electric field is described by a modified from of the Leslie equation. Proton nuclear magnetic resonance experiments observing static director orientations in different angles between the director and the magnetic field are described together with reorientation experiments driven by various electric fields. A new technique to measure Δχ/Δε is presented which gives direct access to the anisotropies without any influence of elastic properties. Using electric fields of different strength and in different angles with respect to the magnetic field the dynamic processes in liquid crystals can be investigated in a very flexible way. A number of experiments investigating the homogeneous director reorientation in the electric field is presented. As one result the rotational viscosity was determined. As a surprising result we found a homogeneous reorientation in the electric field and an inhomogeneous reorientation back in the magnetic field even though the initial angles between the director and the external field were the same. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.482060
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  • 3
    Electronic Resource
    Electronic Resource
    Climate correlations between Greenland and Antarctica during the past 100,000 years (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 663-666 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The oxygen isotope ratio (〈518O) of O2 in the modern atmosphere (〈518Oatm) is 23.5%o heavier than mean ocean water6, mainly due to fractionation of the oxygen isotopes during photosynthesis, respiration and hydrological processes7 9. (See Fig. 1 legend for a definition of S18O). The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372663a0
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  • 4
    Electronic Resource
    Electronic Resource
    Uniformity of Radiation-induced Mutation Rates among Different Species (1973)
    [s.l.] : Nature Publishing Group
    Nature 245 (1973), S. 460-462 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Relation between forward mutation rate per locus per rad and the DNA content per haploid genome. Line drawn with slope of one through the mouse point. Point for man estimated from DNA content. The development of target theory in radiobiology and the recognition that the genetic material is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/245460a0
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  • 5
    Electronic Resource
    Electronic Resource
    Physiological exclusion of magnesium from Mytilus edulis calcite (1977)
    [s.l.] : Nature Publishing Group
    Nature 269 (1977), S. 793-794 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Young M. edulis (7-15 mm long) were collected from Nar-ragansett Bay, Rhode Island and cultured for 8 weeks in aerated 4.5-1 glass aquaria. The water was changed at weekly intervals and the mussels were fed a suspension of Isochrysis. Twenty mussels were placed in each tank. The culture solutions ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/269793a0
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  • 6
    Electronic Resource
    Electronic Resource
    Reliability of amino acid racemisation dating and palaeotemperature analysis on bones (1974)
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 378-379 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Bada et al. have investigated amino acid racemisation geochemistry as a method of dating fossil bones2 and as a means of deducing palaeotemperature data where ages have been independently determined. They showed that ?ages? or ?palaeo-temperatures? calculated from data of racemisation of amino ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/252378a0
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  • 7
    Electronic Resource
    Electronic Resource
    Carbon biogeochemistry and climate change (1994)
    Springer
    Photosynthesis research 39 (1994), S. 209-234 
    Details
    ISSN: 1573-5079
    Keywords: carbon biogeochemistry ; climate change ; carbon cycle ; atmospheric CO2 content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The rapid increase of atmospheric CO2 resulting from anthropogenic activites has stimulated a great deal of interest in the carbon cycle. Important decisions need to be made about future tolerable levels of atmospheric CO2 content, as well as the land and fossil fuel use strategies that will permit us to achieve these goals. The vast amount of new data on atmospheric CO2 content and ancillary properties that has become available during the last decade, and the development of models to interpret these data, have led to significant advances in our capacity to deal with such issues. However, a major continuing source of uncertainty is the role of photosynthesis in providing a sink for anthropogenic emissions. It is thus appropriate that a new evaluation of the status of our understanding of this issue should be made at this time. The aim of this paper is to provide a setting for the papers that follow by giving an overview of the role of carbon dioxide in climate, the biogeochemical processes that control its distribution, and the evolution of carbon dioxide through time from the origin of the earth to the present. We begin with a discussion of relevant processes. We then proceed to a more detailed discussion of the time periods that are best documented: the late Pleistocene (during which time large continental ice sheets waxed and waned) and the modern era of anthropogenic impact on the carbon cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014585
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  • 8
    Electronic Resource
    Electronic Resource
    A routing algorithm for connection‐oriented Low Earth Orbit (LEO) satellite networks with dynamic connectivity (2000)
    Springer
    Wireless networks 6 (2000), S. 181-190 
    Details
    ISSN: 1572-8196
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Computer Science
    Notes: Abstract Low Earth Orbit (LEO) satellites move with respect to a fixed observer on the Earth surface. Satellites in the polar regions and the seam switch off their intersatellite links to the neighbor satellites. As a result, the connectivity pattern of the network changes. Ongoing calls passing through these links need to be rerouted. A large number of simultaneous rerouting attempts would cause excessive signaling load in the network. Moreover, the handover calls could be blocked because of the insufficient network resources in the newly established routes or large connection re‐establishment delay. In this paper, a routing protocol is introduced to reduce the number of routing attempts resulting from link connectivity change. The protocol does not use the links that will be switched off before the connection is over. Since the call durations are not known a priori, the proposed protocol utilizes a probabilistic approach. The performance of the protocol is evaluated through simulation experiments. The experimental results indicate that the routing protocol reduces the number of rerouting attempts resulting from connectivity changes of the network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019133429805
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  • 9
    Electronic Resource
    Electronic Resource
    A prototype expert system for fishway design (1992)
    Springer
    Environmental monitoring and assessment 23 (1992), S. 115-127 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The design of structures for fish passage in rivers and streams provides an opportunity to apply expert system concepts to a design problem. Fishways contribute to the sustainable development of water resources projects by providing a path that allows fish migrations to be maintained. A prototype expert system (FDES) has been developed to recommend the most suitable fishway type for given design conditions. A recommendation is provided on the basis of fishway hydraulics, fish passage performance, and cost requirements. Fishway design demands expertise in various scientific disciplines such as hydrology, hydraulics, and fish biology. Expert system technology may be used to reduce design time requirements and to serve as a teaching aid to inexperienced engineers by organizing and accessing the cumulative knowledge of the most experienced designers. The rule-based expert system development tool, VP-Expert, supplies the backward chaining control structure for accessing the knowledge within the prototype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406956
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  • 10
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    Unknown
    Quadrupole and hexadecapole couplings for127IinLi127I (2001)
    American Physical Society
    Details
    Publication Date: 2001-01-08
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Physical Society
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