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  • Articles  (388)
  • 2010-2014
  • 1995-1999  (388)
  • 1960-1964
  • 1930-1934
  • 1998  (388)
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  • 2010-2014
  • 1995-1999  (388)
  • 1960-1964
  • 1930-1934
Year
Journal
Topic
  • 1
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    The dependence of high-latitude Pc5 wave power on solar wind velocity and on the phase of high-speed solar wind streams. (1998)
    In:  Journal of Geophysical Research
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 2
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    The impact of small benthic passive suspension feeders in shallow marine ecosystems the hydroids as an example (1998)
    In:  EPIC3Zoologische Verhandelingen, 323, pp. 99-105
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 3
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    The impact of small benthic passive suspension feeders in shallow marine ecosystems: the hydroids as an example (1998)
    In:  Zoologische Verhandelingen vol. 323 no. 8, pp. 99-105
    Details
    Publication Date: 2024-01-12
    Description: Benthic suspension feeders are abundant in littoral and shallow sub-littoral ecosystems, where they feed on the plankton and on organic matter suspended in the water column. Recent studies indicate that active suspension feeders with powerful water filtration mechanisms (e.g., bivalve molluscs) may exert an important influence on the abundance and production of phytoplankton, and probably zooplankton as well. Passive suspension feeders, such as hydrozoans, have received less attention, and their effect on shallow planktonic communities is poorly understood. This paper presents evidence that hydrozoans, which make only a minor contribution to benthic community biomass, capture large amounts of zooplankton and seston, and that they may play an important role in transferring energy from pelagic to benthic ecosystems over a wide range of latitudes.
    Keywords: benthic passive suspension feeders ; shallow marine ecosystems ; hydroids.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 4
    Electronic Resource
    Electronic Resource
    Oligopoly, Financial Structure, and Resolution of Uncertainty (1998)
    Oxford, UK : Blackwell Publishing Ltd.
    Journal of economics & management strategy 7 (1998), S. 0 
    Details
    ISSN: 1530-9134
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: We characterize equilibria of a multistage game in which competing duopolists may acquire and share information in advance of choosing their financial structure which, in turn, precedes production. Given sufficient uncertainty, equilibria exist in which the efficiency and, possibly, coordination gains to acquiring and sharing perfect information are sufficient to break Brander and Lewis's (1986) result wherein both firms issue debt to their mutual disadvantage. However, more interesting may be the robustness of that result when uncertainty is low or when information is imperfect. The key insight is that the consequences of issuing debt are invariant to the level of uncertainty, given that firms can recalibrate the terms of debt to achieve the Stackelberg solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1430-9134.1998.00067.x
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  • 5
    Electronic Resource
    Electronic Resource
    Temporal trends in bromide release following rewetting of a naturally drained gully mire (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 14 (1998), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Recently, there has been interest in the occurrence of bromide (Br-) in natural waters since it has been demonstrated that Br-, in association with humic substances in raw waters, is readily incorporated into haloacetic acids in the form of organically bound bromine (Br) during water chlorination. We report results of the effects of experimentally rewetting a naturally drained gully mire on the hydrochemistry of Br-, iron (Fe) and dissolved organic carbon (DOC) in the peat water. Results obtained over a three year period showed that rewetting substantially increased the concentrations of these solutes in the pore water, with peak values of 1 mg dm-3 (Br-), 〉 60 mg dm-3 (Fe) and 〉 300 mg dm-3 (DOC) detected in some samples after rewetting, compared with typical values 〈 0.05 mg dm-3 (Br-), 〈 1 mg dm-3 (Fe) and 〈 15 mg dm-3 (DOC) under the drained conditions. Bromide, Fe and DOC release were highly seasonal, with the largest concentrations observed in late-summer to autumn. However, whereas seasonal peak concentrations of Fe and DOC have since remained at these higher levels, seasonal peak concentrations of Br- were progressively attenuated over time, suggesting the latter phenomenon is a flush effect, with no longer-term consequences for water quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1998.tb00161.x
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  • 6
    Electronic Resource
    Electronic Resource
    NATURAL SELECTION AT MAJOR HISTOCOMPATIBILITY COMPLEX LOCI OF VERTEBRATES (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 32 (1998), S. 415-435 
    Details
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The loci of the vertebrate major histocompatibility complex encode cell-surface glycoproteins that present peptides to T cells. Certain of these loci are highly polymorphic, and the mechanisms responsible for this polymorphism have been intensely debated. Four independent lines of evidence support the hypothesis that MHC polymorphisms are selectively maintained: (a) The distribution of allelic frequencies does not fit the neutral expectation. (b) The rate of nonsynonymous nucleotide substitution significantly exceeds the rate of synonymous substitution in the codons encoding the peptide-binding region of the molecule. (c) Polymorphisms have been maintained for long periods of time ("trans-species polymorphism"). (d) Introns have been homogenized relative to exons over evolutionary time, suggesting that balancing selection acts to maintain diversity in the latter, in contrast to the former.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.genet.32.1.415
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  • 7
    Electronic Resource
    Electronic Resource
    Australian – USA Federal Government Accounting: Convergence or Divergence? (1998)
    Oxford, UK and Boston, USA : Blackwell Publishers
    Financial accountability and management 14 (1998), S. 0 
    Details
    ISSN: 1468-0408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Despite moves toward international harmonisation of accounting standards, there is evidence that standards regulating government accounting in various countries are diverging. This paper argues that, despite their similar federal systems and ostensibly similar objectives for federal government reporting, the accounting standards of the USA and Australia differ significantly in detail. A comparison of their objectives and standards reveals that the standards particularly differ in relation to accounting for assets, and in determining the performance of a reporting entity. Although these divergences emanate from differing philosophies underlying the standards of the two countries, they have implications for international harmonisation of accounting standards, and for reciprocity agreements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1468-0408.00064
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of growth interruption on the properties of InGaAs/InAlAs quantum well structures (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 338-340 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of the growth interruption time during the growth of InGaAs/InAlAs quantum well structures is shown to have a significant effect on both the interband transitions, as determined by photoreflectance, and the electrical properties of the as-grown structure. The results show that, for increasing growth interruption time, the quantum well heterointerfaces become more abrupt and the carrier mobility increases, thereby demonstrating that long interruption times are preferable for the growth of high quality rectangular quantum well structures. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120729
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  • 9
    Electronic Resource
    Electronic Resource
    Terahertz pulse-induced switching of a quantum-well optical amplifier (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3872-3874 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate theoretically that an intense half-cycle terahertz pulse can be used conjunctively with a quantum-well optical amplifier to form the basis of an efficient ultrahigh-speed optical switch. Our procedure implies terahertz and subterahertz switching and recovery rates, respectively. Constraints and practicalities are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122921
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  • 10
    Electronic Resource
    Electronic Resource
    MODELING A CONCRETE BLOCK IRRIGATION DIVERSION SYSTEM (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 34 (1998), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Concrete block irrigation diversion systems have been proposed as alternatives to permanent dams of concrete or rock or temporary gravel berms. Permanent dams can cause stream channel instability, bank erosion, sediment pollution, ice flow blockage, and safety problems for recreational floating craft. Temporary berms can require substantial streambed disturbance and can promote sediment pollution, stream bank instability, and bank erosion. A design procedure was developed based on a model of the hydraulic performance of concrete block diversion systems. The procedure was used to model a site on the Gallatin River in Montana. The method relies on HEC-RAS (Hydrologic Engineering Center -River Analysis System) software combined with analytical techniques in an iterative scheme. The hydraulic performance of different diversion configurations (the existing heavy-rock diversion system, concrete blocks oriented parallel to flow, and concrete blocks oriented diagonally) was assessed using the model under a range of flow rates. The minimum diversion dimensions (length, number, and size of blocks) that maintained block stability while diverting the requisite flow were determined for each model run. At the Gallatin River site, the block system oriented parallel to flow required less diversion material than the diagonal orientation. The recommended diversion length was 51.8 m (170 ft). Trapezoidal blocks with a top width of 20.3 cm (8 in), a height of 45.7 cm (18 in), and side slopes of 2 vertical to 1 horizontal were specified. This configuration minimizes the total block mass, diverts the required flow, and has a factor of safety of 2.0 against block displacement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1998.tb04163.x
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