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  • 1
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    Ireland's First Step Toward Freedom (1962)
    Philadelphia : Periodicals Archive Online (PAO)
    Social studies. 53:5 (1962:Oct.) 184 
    Details
    ISSN: 0037-7996
    Topics: History
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3111-1962-053-05-000009
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  • 2
    Electronic Resource
    Electronic Resource
    Extremely low N 2 O concentrations in the springtime stratosphere at McMurdo Station, Antarctica (1988)
    [s.l.] : Nature Publishing Group
    Nature 332 (1988), S. 53-55 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The calculated chemical lifetime of N2O in the troposphere is in the range of 100-200 years2. Only in the stratosphere, above 15km, does the lifetime become short enough to cause a sig-nificant latitudinal gradient. At 25 km, the measured mixing ratio in high-latitude summers can be one third to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/332053a0
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  • 3
    Electronic Resource
    Electronic Resource
    The asymmetric monopole and non-newtonian forces (1989)
    [s.l.] : Nature Publishing Group
    Nature 341 (1989), S. 131-132 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 shows the cross-section through a rotationally sym-metric object of constant density that has a hollow interior. The object is created by rotating the figure through the horizontal axis (not shown). The gravitational potential outside the object (referred to as the 'apple' because of its ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/341131a0
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of the Antarctic ozone hole by the CIO dimer mechanism (1988)
    [s.l.] : Nature Publishing Group
    Nature 336 (1988), S. 455-458 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] All chlorine-driven mechanisms for ozone depletion have in common the reaction: In the middle stratosphere this is turned into a catalytic cycle through reaction with atomic oxygen7: This mechanism fails in the lower stratosphere, however, because of the extremely low O atom ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/336455a0
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  • 5
    Electronic Resource
    Electronic Resource
    Maternal transmission of mitochondrial DNA in interspecific hybrids of Populus (1992)
    Springer
    Current genetics 22 (1992), S. 141-145 
    Details
    ISSN: 1432-0983
    Keywords: Poplars ; Mitochondrial genome ; Maternal inheritance ; Restriction fragment length polymorphism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Restriction fragment analysis was conducted to investigate the mode of inheritance of mitochondrial (mt) DNA in F1 progeny of two P. deltoides x P. deltoides, three P. deltoides x P. nigra, and two P. deltoides x P. maximowiczii controlled crosses, and in Populus x canadensis by using 16 restriction endonucleases and two heterologous probes of cloned mtDNA fragments of maize. Five restriction fragment length polymorphisms (RFLPs) of mtDNA differentiated P. deltoides from P. nigra, whereas three RFLPs of mtDNA separated P. deltoides from P. maximowiczii. In all cases, F1 progeny of P. deltoides x P. nigra, and P. deltoides x P. maximowiczii, crosses had mtDNA restriction fragments of only their maternal P. deltoides parents. P. x canadensis had mtDNA restriction fragments of only P. deltoides. F1 progeny of intraspecific P. deltoides crosses also had the same mtDNA fragments as their maternal parent. The results clearly demonstrate uniparental-maternal inheritance of the mitochondrial genome in F1 interspecific hybrids of P. deltoides with P. nigra and P. maximowiczii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351474
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  • 6
    Electronic Resource
    Electronic Resource
    Holonomy and path structures in general relativity and Yang-Mills theory (1991)
    Springer
    International journal of theoretical physics 30 (1991), S. 1171-1215 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This article is about a different representation of the geometry of the gravitational field, one in which the paths of test bodies play a crucial role. The primary concept is the geometry of the motion of a test body, and the relation between different such possible motions. Space-time as a Lorentzian manifold is regarded as a secondary construct, and it is shown how to construct it from the primary data. Some technical problems remain. Yang-Mills fields are defined by their holonomy in an analogous construction. I detail the development of this idea in the literature, and give a new version of the construction of a bundle and connection from holonomy data. The field equations of general relativity are discussed briefly in this context.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00671007
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  • 7
    Electronic Resource
    Electronic Resource
    A quasi-continuous record of atmospheric opacity at λ = 1.1 mm over 34 days at Mauna Kea observatory (1983)
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 757-765 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009694
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  • 8
    Electronic Resource
    Electronic Resource
    Additional atmospheric opacity measurements at λ=1.1 mm from Mauna Kea observatory, Hawaii (1987)
    Springer
    International journal of infrared and millimeter waves 8 (1987), S. 431-440 
    Details
    ISSN: 1572-9559
    Keywords: atmospheric opacity ; mm wave absorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Atmospheric opacity values in the zenith direction are given for a wavelength of 1.1 mm (278 GHz) at the summit of Mauna Kea in the Hawaiian Islands. A total of 75 days is covered during the period 1983–1986. Observations were made on a quasi-continuous basis, with opacity measured every 20 minutes around the clock for significant periods of time. A conversion from opacity at λ=1.1 mm to the equivalent preciptable water vapor column is given from the measurements of Zammit and Ade, from which opacities at other wavelengths may be derived. The data presented here supplement those in an earlier paper covering 34 days in the fall of 1982.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013256
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  • 9
    Electronic Resource
    Electronic Resource
    Holonomy and gravity (1989)
    Springer
    General relativity and gravitation 21 (1989), S. 457-466 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is proposed that the gravitational field can be described in an invariant way by its “holonomy set” involving paths in Minkowski space and points in the Lorentz group. The differentiable manifold of gravity does not enter as a basic object but is constructed in a manner depending on the field configuration. Thus there is no diffeomorphism symmetry in this description of gravity, nor is the topology of space-time fixed at the outset. It is therefore proposed that the “holonomy description” of gravity provides a much better starting point for the analysis of quantum gravity. Striking similarities with Yang-Mills gauge theories emerge which shed light on the problem of whether gravity is or is not a gauge theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00904497
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  • 10
    Electronic Resource
    Electronic Resource
    Optimal finite element solutions to diffusion-convection problems in one dimension (1980)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 15 (1980), S. 1457-1474 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Petrov-Galerkin methods have been proposed by several authors to eliminate the inaccuracies and oscillations obtained with Galerkin methods when applied to diffusion-convection problems at high Péclet numbers: the difficulty is to select the appropriate test space for a given trial space. We investigate here choices of test space which either exactly or approximately symmetrize the associated bilinear form and so retain the optimal character of the approximate solution. This is the key to high accuracy and superconvergence, and optimal recovery techniques are proposed to obtain the maximum information from the approximations. Examples are given to show how the position and thickness of boundary layers may be estimated with relatively coarse meshes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620151004
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