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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Communications in mathematical physics 118 (1988), S. 401-410 
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We show that for a surjective endomorphism of a compact abelian group ergodicity is equivalent to a condition which impliesr-mixing for allr≧1, and we characterize such maps algebraically. This is then used in proving the ergodicity of an extensive class of endomorphisms of the binary sequence space. As a simple corollary it is found that one-dimensional linear cellular automata and the accumulator automata arer-mixing for allr≧1.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2017-10-20
    Description: The development of models of marine ecosystems in the Southern Ocean is becoming increasingly important as a means of understanding and managing impacts such as exploitation and climate change. Collating data from disparate sources, and understanding biases or uncertainties inherent in those data, are important first steps for improving ecosystem models. This review focuses on seals that breed in ice habitats of the Southern Ocean (i.e. the crabeater seal, Lobodon carcinophaga; Ross seal, Ommatophoca rossii; leopard seal, Hydrurga leptonyx; and Weddell seal, Leptonychotes weddellii). Data on populations (abundance and trends in abundance), distribution and habitat use (movement, key habitat and environmental features) and foraging (diet) are summarised, and potential biases and uncertainties inherent in those data are identified and discussed. Spatial and temporal gaps in knowledge of the populations, habitats and diet of each species are also identified.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 3
    Publication Date: 2017-11-28
    Description: Blue whales produce regionally-distinct songs. In over a decade since McDonald and colleagues published a summary of biogeographic differences in blue whale songs worldwide, multiple new publications have explored the seasonality and distribution of those songs. We review the spatial and temporal occurrence of previously-defined song types and report several new blue whale song types. At least thirteen songs believed to be produced by blue whales are now known worldwide, five more than reported in the previous review. In the North Pacific Ocean there are three blue whale songs: the well-studied Northeast Pacific song, the Central North Pacific (previously called Northwest and North Pacific) song, and a new song recorded off Hokkaido, Japan. There is spatial overlap of the Northeast Pacific and Central North Pacific songs in the Gulf of Alaska. Similarly, the new song co-occurs with the Central North Pacific song off Hokkaido. Only one blue whale song occurs in the North Atlantic. At least nine songs are present in the Southern Hemisphere. The Antarctic blue whale song is the most widely distributed, occurring in the Southern Ocean as well as seasonally extending into the other oceans of the Southern Hemisphere. The Indian Ocean has the largest variety of blue whale songs, with new data suggesting the Southwest Indian Ocean song should have type locality Madagascar, with Diego Garcia possibly another song-type. Southeast Pacific contains two distinct, co-occurring songs. We report a new song in the South Atlantic, near South Georgia Island, that also occurs seasonally off Ascension Island. Occasionally blue whale songs were recorded outside of their reported range, indicating individuals at times roam more broadly. However, this is not a common occurrence. This new information and finer details of occurrence will enable further development of hypotheses for blue whale population structure based on acoustics.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
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  • 4
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Summary The paper demonstrates the existence of singular stress layers in normal cross-sections of helically reinforced hollow cylinders. The material is assumed to be an ideal fibre-reinforced material. The theory is illustrated by its application to the problem of a linear elastic, balanced angle-ply cylinder which is ringclamped at both ends and subjected to internal pressure.
    Notes: Zusammenfassung Diese Arbeit zeigt das Bestehen singulärer Spannungsflächen in achsennormalen Querschnitten von spiralfaserverstärkten Hohlzylindern. Es wird angenommen, dass der Werkstoff ideal faserverstärkt ist. Als Beispiel der Anwendung der Theorie wird das Problem eines linear-elastischen gleichwinklig gelegten Zylinders behandelt, der an beiden Enden ringförmig gelagert und mit Innendruck belastet ist.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The simple non-Fickian model for the substitutional diffusion of an impurity in a III-V semiconductor proposed by Zahari and Tuck assumes that both the impurity and host atoms diffuse by a vacancy mechanism. Here we give an asymptotic analysis of the governing pair of coupled partial differential equations, obtaining analytical solutions for the impurity and vacancy distributions in systems for which the impurity diffusivity is much greater than that of the vacancies. Two problems are considered. The first is that in which the impurity concentration is initially zero and a prescribed concentration is given at the surface. The second problem models the diffusion of ion implanted impurity, for which initial impurity and vacancy distributions are specified and a condition of zero impurity flux is assumed at the surface. Both leading order and correction terms are obtained and in each case the solution predicts the anomalous ‘double profiles’ often observed in III-V systems. The ‘ion-implantation analysis’ also displays the observed phenomenon of ‘uphill’ diffusion against the impurity gradient close to the surface.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A substitutional-interstitial model for impurity diffusion in semi-conductors is discussed. In particular we consider a surface-source problem and obtain asymptotic solutions in the limit of the surface concentration of impurity being much greater than the equilibrium vacancy concentration. In the absence of vacancy generation, a double error function impurity curve is obtained. These double profiles reproduce some of the qualitative features of diffusion in many III–V semiconductor systems. We also discuss how vacancy generation modifies the analysis and show that in the limit of high vacancy generation, the problem becomes one of linear diffusion with the diffusion curves then being single error function complements.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2019-01-29
    Description: Flight summary of biomedical sciences experiments in Gemini Program
    Keywords: BIOTECHNOLOGY
    Type: NASA-TM-X-58074
    Format: application/pdf
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  • 8
    Publication Date: 2019-01-29
    Description: Summary of inflight experiments performed during Gemini 3 to 12 missions
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-58075
    Format: application/pdf
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  • 9
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In the present paper we consider finite plane deformations of a cantilever beam composed of an ideal fibre-reinforced material with its fibres aligned along the beam. The beam is deformed by a point force acting on its end face. It is assumed that the point force does not change its magnitude or direction during the deformation so that it is a “dead load”. Several new kinematically admissible solutions are obtained and minimum energy methods are used to obtain their ranges of validity.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 25 (1933), S. 397-402 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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