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  • 2010-2014  (32)
  • 2000-2004  (189)
  • 1990-1994  (24)
  • 1980-1984  (22)
  • 1975-1979  (12)
  • 1960-1964  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    CHROMOSOME ABERRATIONS IN IRRADIATED HUMAN SUBJECTS (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 114 (1964), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1964.tb53579.x
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  • 2
    Digitale Medien
    Digitale Medien
    CYTOGENETICS AND EVOLUTION OF PRIMATES (1962)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 102 (1962), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1962.tb13644.x
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  • 3
    Digitale Medien
    Digitale Medien
    Kepone in the James River (1980)
    s.l. : American Chemical Society
    Environmental science & technology 14 (1980), S. 918-923 
    Details
    ISSN: 1520-5851
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Energietechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/es60168a001
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.482060
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  • 5
    Digitale Medien
    Digitale Medien
    Trace elements and ocean chemistry (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 203-204 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE article in this issue of Nature by Elderfield and Greaves (p.214) reflects two important trends in the study of the marine chemistry of the trace metals. First, there is increasing interest in the detailed chemical behavior of trace elements in the oceans - the complexing of metals with anions ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/296203a0
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  • 6
    Digitale Medien
    Digitale Medien
    Physiological exclusion of magnesium from Mytilus edulis calcite (1977)
    [s.l.] : Nature Publishing Group
    Nature 269 (1977), S. 793-794 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/269793a0
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Informatik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019133429805
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/372663a0
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  • 9
    Digitale Medien
    Digitale Medien
    Carbon biogeochemistry and climate change (1994)
    Springer
    Photosynthesis research 39 (1994), S. 209-234 
    Details
    ISSN: 1573-5079
    Schlagwort(e): carbon biogeochemistry ; climate change ; carbon cycle ; atmospheric CO2 content
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00014585
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  • 10
    Digitale Medien
    Digitale Medien
    A prototype expert system for fishway design (1992)
    Springer
    Environmental monitoring and assessment 23 (1992), S. 115-127 
    Details
    ISSN: 1573-2959
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00406956
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