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  • Articles  (116)
  • Springer  (79)
  • American Geophysical Union  (19)
  • Institute of Physics  (18)
  • 2010-2014  (85)
  • 1990-1994  (31)
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  • Articles  (116)
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  • 1
    Electronic Resource
    Electronic Resource
    Atrazine, alachlor, and carbofuran contamination of well water in central maine (1992)
    Springer
    Bulletin of environmental contamination and toxicology 49 (1992), S. 1-9 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193333
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  • 2
    Electronic Resource
    Electronic Resource
    Implications for the thermal regime of acoustic noise measurements in Crater Lake, Mount Ruapehu, New Zealand (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 493-501 
    Details
    ISSN: 1432-0819
    Keywords: Key words Acoustic noise ; Steam ; Crater lake ; Volcano ; Ruapehu
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hydrophone measurements of acoustic noise levels in the Crater Lake of Mount Ruapehu, New Zealand were made on 18 January 1991 from an inflatable rubber boat on the lake. The greatest sound pressures were recorded in the 1–10 Hz band, with sound levels generally decreasing about 20 dB per decade from 10 Hz to 80 kHz. The low frequency noise did not have an obvious relationship to the tremor observed at a seismic station within 1 km of the lake. The comparatively low levels of middle and high frequency sound meant that at the time of measurement, direct steam input did not make a significant contribution to the heating of Crater Lake. This is consistent with the earlier conclusion that during the last decade a major part of the heat input of Crater Lake has come from lake water that was heated below the lake and recycled back into the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050058
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  • 3
    Electronic Resource
    Electronic Resource
    A quantitative measure of error minimization in the genetic code (1991)
    Springer
    Journal of molecular evolution 33 (1991), S. 412-417 
    Details
    ISSN: 1432-1432
    Keywords: Genetic code ; Complementary hydropathy ; Translation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have calculated the average effect of changing a codon by a single base for all possible single-base changes in the genetic code and for changes in the first, second, and third codon positions separately. Such values were calculated for an amino acid's polar requirement, hydropathy, molecular volume, and isoelectric point. For each attribute the average effect of single-base changes was also calculated for a large number of randomly generated codes that retained the same level of redundancy as the natural code. Amino acids whose codons differed by a single base in the first and third codon positions were very similar with respect to polar requirement and hydropathy. The major differences between amino acids were specified by the second codon position. Codons with U in the second position are hydrophobic, whereas most codons with A in the second position are hydrophilic. This accounts for the observation of complementary hydropathy. Single-base changes in the natural code had a smaller average effect on polar requirement than all but 0.02% of random codes. This result is most easily explained by selection to minimize deleterious effects of translation errors during the early evolution of the code.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02103132
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  • 4
    Electronic Resource
    Electronic Resource
    Snail (Helix aspersa) exposure history and possible adaptation to lead as reflected in shell composition (1994)
    Springer
    Archives of environmental contamination and toxicology 27 (1994), S. 346-351 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Lead sequestration in shell was examined for English and Welsh populations of the common garden snail (Helix aspersa) with different Pb exposure histories. Isotopic Pb ratios provided signatures for Pb source and a means of implying duration of population exposure from decades to millennia. Total Pb concentrations were used to quantify the intensity of exposure experienced by the populations. Snails from populations with long histories of exposure (millennia) to high Pb levels had proportionately more Pb in their shell than soft tissue compared with snails from other surveyed populations. These observations suggest that Pb sequestration in shell has been enhanced in H. aspersa populations with long and intense exposure to Pb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213170
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  • 5
    Electronic Resource
    Electronic Resource
    Implications for the thermal regime of acoustic noise measurements in Crater Lake, Mount Ruapehu, New Zealand (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 493-501 
    Details
    ISSN: 1432-0819
    Keywords: Acoustic noise ; Steam ; Crater lake Volcano ; Ruapehu
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hydrophone measurements of acoustic noise levels in the Crater Lake of Mount Ruapehu, New Zealand were made on 18 January 1991 from an inflatable rubber boat on the lake. The greatest sound pressures were recorded in the 1–10 Hz band, with sound levels generally decreasing about 20 dB per decade from 10 Hz to 80 kHz. The low frequency noise did not have an obvious relationship to the tremor observed at a seismic station within 1 km of the lake. The comparatively low levels of middle and high frequency sound meant that at the time of measurement, direct steam input did not make a significant contribution to the heating of Crater Lake. This is consistent with the earlier conclusion that during the last decade a major part of the heat input of Crater Lake has come from lake water that was heated below the lake and recycled back into the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302830
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  • 6
    Electronic Resource
    Electronic Resource
    The operator quantization of the open bosonic string: Field algebra (1993)
    Springer
    Communications in mathematical physics 156 (1993), S. 473-525 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Our aim in this paper is to make explicit the operator theory of the heuristic open Bosonic string and to abstract a suitable field algebra for the string. This is done on a Fock-Krein space and we examine integrability and J-unitary implementability of all the defining transformations of the string, i.e. time translations, gauge transformations and Poincaré transformations. The results obtained agree partially with those of Bowick and Rajeev, i.e. the gauge transformations do not leave the Fock-Krein complex structure invariant. Once we obtained integrated transformation groups on a suitable symplectic space for the infinitesimal transformations of the string, and proved implementability of these for the Fock-Krein representation, we are then free to define an abstract C*-algebra carrying all the algebraic information of the string, and to examine different representations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096861
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  • 7
    Electronic Resource
    Electronic Resource
    An evaluation of Radon transform computations using DSP chips (1990)
    Springer
    Machine vision and applications 3 (1990), S. 63-74 
    Details
    ISSN: 1432-1769
    Keywords: Radon transform ; back-projection ; image reconstruction ; multidimensional signal processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The Radon transform and its inverse (a filtered backprojection) are receiving increasing attention for applications in image reconstruction. As data collection capabilities and image reconstruction algorithms have become more sophisticated, the computational intensity of these problems has drastically increased. Parallel processing techniques are being used to implement highspeed hardware designs that will speed up this computationally burdensome task. Parallel arrays of digital signal processing (DSP) chips may be used to compute the Radon transform and back-projection for high-speed image reconstruction. In this paper we describe computation of the Radon transform and back-projection using a parallel pipelined processor architecture of DSP chips and evaluate the accuracy of the computations and quality of reconstructed images. To justify the computational approach selected, alternative procedures for computation of the Radon transform and back-projection are described and their performance using the 32-bit fixed-point arithmetic of the selected DSP chips are compared. We present, evaluate, and compare the simulated performances of implementations of these procedures on two fixed-point DSP chips: the TI TMS32020 and the AT&T DSP16.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212191
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  • 8
    Electronic Resource
    Electronic Resource
    Ionic requirements for establishment of an embryonic axis in Pelvetia zygotes (1991)
    Springer
    Planta 185 (1991), S. 27-33 
    Details
    ISSN: 1432-2048
    Keywords: Embryogenesis (Pelvetia) ; Ionic circulation ; Polarity induction ; Pelvetia ; Potassium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Previous reports have shown that fertilized Pelvetia fastigiata (J. Ag.) DeToni eggs generate a transcellular ionic current which correlates temporally and spatially with establishment of a rhizoid/thallus axis. In order to understand more fully the ionic controls of development, we have determined the ionic requirements for axis formation induced by unilateral light. Formation of the developmental axis was independent of the presence of individual ions in artificial seawater. This finding indicates that transcellular circulation of a particular ion is not obligatory for polarization, and it confirms earlier work showing that calcium circulation is not fundamental to axis establishment in Fucus zygotes. Polarization was not, however, completely independent of ionic conditions; zygotes were unable to form an axis in pure sucrose solutions. Single salts were added to sucrose to determine which ions were sufficient to permit polarization. Salts of impermeant monovalent cations and salts of divalent cations supported polarization weakly or not at all. By contrast, zygotes photopolarized well in KCl, and other alkali metals substituted for K+ with varying effectiveness (Rb+〉Na+〉 Cs+≫ Li+). The anion was unimportant; a variety of different potassium salts all supported polarization equally well. The mechanism by which KCl promotes polarization is not yet understood, but may involve transport through K+ channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194510
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  • 9
    Electronic Resource
    Electronic Resource
    Immunoprecipitation of a pertussis toxin substrate of the Go family from rat islets of Langerhans (1992)
    Springer
    Bioscience reports 12 (1992), S. 95-100 
    Details
    ISSN: 1573-4935
    Keywords: Insulin secretion ; pancreatic B-cell ; G-protein ; adenylate cyclase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Rat islets express a pertussis toxin sensitive G-protein involved in receptor-mediated inhibition of insulin secretion. This has been assumed previously to represent “Gi” which couples inhibitory receptors to adenylate cyclase. Incubation of islet G-proteins with32P-NAD and pertussis toxin resulted in the labelling of a band of molecular weight 40,000. This band was very broad and did not allow resolution of individual components. Incubation of the radiolabelled proteins with an anti-Go antiserum resulted in specific immunoprecipitation of a32P-labelled band. These results demonstrate that the complement of pertussis toxin sensitive G-proteins in rat islets includes Go.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02351213
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  • 10
    Electronic Resource
    Electronic Resource
    The impact of a chief planning officer on the administrative environment for planning (1992)
    Springer
    Research in higher education 33 (1992), S. 1-17 
    Details
    ISSN: 1573-188X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Institution-wide planning, to be effective, must have the support of key administrators. Presidents, vice-presidents, deans, and directors must feel that sufficient consensus can be reached on explicit goals to make comprehensive planning possible and worthwhile. While much has been written about the importance of CEO leadership in gaining broad support for planning, little has been said about the role of the chief planning officer in this regard. This paper, based on a national survey of administrators' views of planning, studies the relationship between having a chief planning officer and administrators' perceptions of campus planning. Its intended audience includes all those interested in institutional planning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00991968
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