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  • Elsevier  (201)
  • Springer  (105)
  • Oxford University Press  (30)
  • Cambridge University Press  (11)
  • American Meteorological Society
  • 2020-2023  (1)
  • 2000-2004  (132)
  • 1980-1984  (129)
  • 1975-1979  (92)
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  • 1
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    Review of Environmental Monitoring by Means of Radio Waves in the Polar Regions: From Atmosphere to Geospace (2022)
    Springer
    Details
    Publication Date: 2022-10-24
    Description: The Antarctic and Arctic regions are Earth’s open windows to outer space. They provide unique opportunities for investigating the troposphere–thermosphere–ionosphere–plasmasphere system at high latitudes, which is not as well understood as the mid- and low-latitude regions mainly due to the paucity of experimental observations. In addition, different neutral and ionised atmospheric layers at high latitudes are much more variable compared to lower latitudes, and their variability is due to mechanisms not yet fully understood. Fortunately, in this new millennium the observing infrastructure in Antarctica and the Arctic has been growing, thus providing scientists with new opportunities to advance our knowledge on the polar atmosphere and geospace. This review shows that it is of paramount importance to perform integrated, multi-disciplinary research, making use of long-term multi-instrument observations combined with ad hoc measurement campaigns to improve our capability of investigating atmospheric dynamics in the polar regions from the troposphere up to the plasmasphere, as well as the coupling between atmospheric layers. Starting from the state of the art of understanding the polar atmosphere, our survey outlines the roadmap for enhancing scientific investigation of its physical mechanisms and dynamics through the full exploitation of the available infrastructures for radio-based environmental monitoring.
    Description: Published
    Description: 1609–1698
    Description: 2A. Fisica dell'alta atmosfera
    Description: 5A. Ricerche polari e paleoclima
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    Determinants of American Migration: Methods and Models in Mobility Research (1975)
    Cambridge : Cambridge University Press
    Journal of American studies 9 (1975), S. 189-197 
    Details
    ISSN: 0021-8758
    Source: Cambridge Journals Digital Archives
    Topics: English, American Studies , History , Political Science , Sociology , Economics
    Notes: While the question of geographic mobility has long been a mainstay of American historical writing and American myth-making – as evidenced by Turner and his disciples and the general obsession widi the frontier – until recently most historians have done little systematic investigation into it. Nor, indeed, have they been aware either of the enormous degree of movement within the country, or of the complex issues involved in determining why people have moved as they have. However, with the rise of what generally is termed the ‘ new urban ’ or ‘ new social ’ history, historians have begun to view migration as a question central to their analysis. Social scientists recognized the importance of migratory behaviour for many years and have employed sophisticated analytical techniques in their efforts to explain migration patterns, but recently historians approached the problem from another direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0021875800010318
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of the transient behavior of kidney models (1978)
    Springer
    Bulletin of mathematical biology 40 (1978), S. 211-221 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Non-steady-state equations for kidney models are stated. General conservation relations for these equations are derived. Transient equations for the central core model of the renal medulla are developed. Solution of the equations by Laplace transform methods for time invariant volume flows is discussed. The general theory of solving models with time dependent flows by finite difference methods is developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461436
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  • 4
    Electronic Resource
    Electronic Resource
    Transient behaviour of the single loop solute cycling model of the renal medulla (1978)
    Springer
    Bulletin of mathematical biology 40 (1978), S. 273-300 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Transient solutions are developed for the buildup of a concentration gradient in the single loop solute cycling model of the renal medulla. The “pump” from ascending limb to descending limb is considered in both unsaturated and completely saturated modes of operation. Both analytic solutions and semianalytic solutions obtained from inverting Laplace transforms are considered. The classic representation of concentration buildup by the multiplication process is compared with calculated profiles. The “single effect” is found to vary both in time and space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461602
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  • 5
    Electronic Resource
    Electronic Resource
    Vitamin addition: an option for sustainable activated sludge process effluent quality (2000)
    Springer
    Journal of industrial microbiology and biotechnology 24 (2000), S. 267-274 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: vitamins; activated sludge; industrial wastewater; porous pots; Amtox™
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The process performance and metabolic rates of samples of activated sludge dosed with vitamin supplements have been compared. After initial screening, four vitamins and two metals as single supplements and in pairs, were dosed continuously into the mixed liquor of an activated sludge simulation. Toxicity, oxygen demand removal, respiration rates and suspended solids were measured to monitor the effect on process efficiency. It was confirmed experimentally that an industrial wastewater stream did not contain a sufficient supply of micronutrients for efficient biological treatment. This was concluded from the observation that control sludge batches (receiving no supplements) averaged chemical oxygen demand removal efficiency of 58%. Dosing micronutrients into the mixed liquor produced removal efficiencies of up to 69%. Some of the supplements increased the respiration rate of the sludge while some decreased it, indicating a range of stimulatory and inhibitory effects. Complex interactions between micronutrients that were dosed simultaneously were evident. Several positive effects led to the conclusion that micronutrients have the potential to optimise process performance of activated sludge plants treating industrial wastewater. The addition of phosphorus/niacin and molybdenum/lactoflavin removed wastewater components that were toxic to nitrifiers as indicated through toxicity testing, thus protecting downstream nitrification/denitrification treatment processes. Journal of Industrial Microbiology & Biotechnology (2000) 24, 267–274.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900817
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  • 6
    Electronic Resource
    Electronic Resource
    Radiation losses due to discontinuities in asymmetric three-layer optical waveguides (1980)
    Springer
    Optical and quantum electronics 12 (1980), S. 143-158 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In this paper, the radiation losses caused by film thickness and refractive index discontinuities in asymmetric slab waveguides are examined theoretically. A technique developed by Mahmoud and Beal for dealing with the continuous part of the radiation spectrum is used. Several numerical examples which show the radiation loss for various waveguide configurations are presented and discussed and, where appropriate, comparisons with other related work made. In the case of asymmetric thickness steps, the radiation losses are found to be appreciably higher than those computed for symmetric guides. The radiation losses for guides having the same thickness were found to decrease as the guide thickness increased. Once the TE1 mode become guided, the losses decreased rapidly. However, if the two guides had different thickness then it was found that the losses exhibited a minimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619558
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  • 7
    Electronic Resource
    Electronic Resource
    Comment on Varshni's recent paper on quasar red shifts (1977)
    Springer
    Astrophysics and space science 51 (1977), S. 117-119 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recent paper (Varshni, 1976) analyses the distribution of quasar red shifts for randomness, in an incorrect manner. A correct analysis shows that this distribution is in agreement with random expectation. Were the distribution highly non-random, the original conclusion was that, for the red shifts to be cosmological, the Earth would have a strongly privileged position in the Universe. A simple alternative model, in which this would not be so, is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642460
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  • 8
    Electronic Resource
    Electronic Resource
    Alterations in the fraction of oxygen in inspired gas affect rates of renal prostaglandin E2 synthesis in anesthetized dogs (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 1293-1294 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Reductions of oxygen in inspired gas from 20% to 15%, in anesthetized dogs, reduced arterial PO2 and increased the renal efflux of PGE2 but not PGF2a . Renal blood flow, blood pressure, plasma renin activity as well as arterial pH and PCO2 were unaffected. PGs may mediate the renal hemodynamic or excretory consequences of alterations in PO2. In addition, minor variations in PO2 might account, in part, for the variable renal venous PGE2 concentrations reported under basal conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01948368
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  • 9
    Electronic Resource
    Electronic Resource
    Elevated concentrations of mercury in mussels (Mytilus californianus) associated with pinniped colonies (1981)
    Springer
    Marine biology 65 (1981), S. 45-48 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The geographic distribution of mercury concentrations in the California mussel Mytilus californianus, collected from 1977–1978 at 43 sites along the western coastline of the continental United States is marked by consistently elevated levels at two locations. These two sites, which are relatively isolated from anthropogenic inputs and mercuryrich minerals, both contain large pinniped and marine bird populations. The relatively elevated mercury levels measured in the excrement of a pinniped from one of those locales indicate that the concentrated discharge of mercuryrich waste products from the marine ecosystem's top carnivores is contaminating lower trophic levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397066
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  • 10
    Electronic Resource
    Electronic Resource
    Stable carbon isotope variability in marine macrophytes and its implications for food web studies (1984)
    Springer
    Marine biology 81 (1984), S. 223-230 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stable carbon isotope ratios (δ13C) of eelgrass Zostera marina and of kelp Laminaria longicruris showed considerable variation in time and space. The isotopic composition of Z. marina varied seasonally from a mean of-6‰ for leaves formed in June to a mean of-10‰ for leaves formed in February. The maximum range for individual leaves was from-5 to-11.4‰. Once a leaf was fully formed, its isotopic composition appeared not to change. In L. longicruris there was no clear seasonal pattern of variation, but in any given blade there was a spatial pattern of variation, with the thickened central band tending to be least negative and the margins most negative. In one blade the range was from-12 to-20‰. Since this range overlaps values that are found in various other macrophytes and in seston, the value of the stable carbon isotope ratio as a tracer in food webs involving macroalgae is questioned. For Z. marina, in which the values are seasonally predictable, the technique may be useful if interpreted with care. The most probable explanation of variation in the ratios is differential storage of biochemical components of different isotopic compostion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393216
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