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  • Springer  (238)
  • American Geophysical Union  (53)
  • 2005-2009  (64)
  • 1990-1994  (131)
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  • 2008  (64)
  • 1994  (131)
  • 1986  (96)
  • 1946
  • 1
    Publication Date: 2008-01-01
    Print ISSN: 1286-4560
    Electronic ISSN: 1297-966X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 18 (1986), S. 93-96 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Agriculture and human values 11 (1994), S. 50-57 
    ISSN: 1572-8366
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Hunger is defined as the inability to obtain sufficient, nutritious, personally acceptable food through normal food channels or the uncertainty that one will be able to do so. After the depression of the 1930s, widespread concerns about hunger in Canada did not resurface until the recession of the early 1980s when the demand for food assistance rose dramatically. The development of an ad hoc charitable food distribution system ensued and by 1992, 2.1 million Canadians were receiving food assistance. In the absence of national monitoring systems, this remains the best available estimate of the prevalence of hunger. Hunger appears to be linked to poverty, unemployment, and numbers of people receiving social assistance. Although the Canadian social security system has traditionally been characterized by government-run universal and targeted programs designed to address income issues, hunger raises concerns about the current “safety net”. The primary response to hunger has been the proliferation of food banks, the agencies at the heart of the charitable food assistance system. On a smaller scale, community-based programs and advocacy initiatives have emerged. Nonetheless, the demand for food assistance continues to rise. The trend raises questions about future directions for social policy in Canada and concerns about the development of a two-tiered food distribution system—one for those with adequate money and one for the poor.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Catalysis letters 29 (1994), S. 349-359 
    ISSN: 1572-879X
    Keywords: pyridine adsorption ; sulfated zirconia ; infrared ; acid sites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pyridine adsorption on sulfated zirconia (SO 2− 4 -ZrO2) provides evidence for infrared bands characteristic of both Brønsted and Lewis acid sites. Samples treated at 100°C retain water and have a higher fraction of Brønsted acidity than when the sample is treated at 400°C. The fraction of Brønsted acid sites observed for SO 2− 4 -ZrO2 is the same in the presence or absence of supported Pt. Based on pyridine adsorption, exposure to gaseous hydrogen at 100 or 150°C did not significantly alter the fraction of Brønsted acid sites following the exposure to hydrogen.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 127 (1986), S. 265-284 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Properties of discrete Alfvén wave modes are derived, at frequencies up to the ion-cyclotron frequency, for current-carrying plasma slabs with non-uniform densities. It is shown that the essential features of the dispersion relations can be derived by examining the dominant terms in the ‘potential’ function, when the wave equation is cast in the Schrödinger equation form. Analytical predictions for a class of mass and current density profiles are compared with numerically calculated dispersion relations and wavefields for particular profiles.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-9435
    Keywords: congestion ; life cycle ; travel demand management ; trip chaining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This paper analyzes trip chaining, focusing on how households organize non-work travel. A trip chaining typology is developed using household survey data from Portland, Oregon. Households are organized according to demographic structure, allowing analysis of trip chaining differences among household types. A logit model of the propensity to link non-work trips to the work commute is estimated. A more general model of household allocation of non-work travel among three alternative chain types — work commutes, multi-stop non-work journeys, and unlinked trips — is also developed and estimated. Empirical results indicate that the likelihood of linking work and non-work travel, and the more general organization of non-work travel, varies with respect to household structure and other factors which previous studies have found to be important. The effects of two congestion indicators on trip chaining were mixed: workers who commuted in peak periods were found to have lower propensity to form work/non-work chains, while a more general congestion indicator had no effect on the allocation of non-work trips among alternative chains.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 16 (1986), S. 239-249 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrochemical oxidation of thin coats of poly(N-vinylcarbazole) on platinum electrodes has been studied. The oxidation is shown to involve initially the cross-linking of the polymer chains through the oxidation of up to 50% of the carbazole moieties in the coat and the dimerization of the resulting pendant carbazole cation radicals. The resulting dimeric carbazole unit is more easily oxidized than the monomer and undergoes a further (reversible) two-electron oxidation. Theory is presented describing the shape of the current-voltage curves obtained, and this together with current transients obtained from potential-step experiments is used to confirm the mechanism and obtain a rate constant of 6×10−3M−1s−1 for the dimerization of the carbazole cation radicals within the coat.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of algebraic combinatorics 3 (1994), S. 137-151 
    ISSN: 1572-9192
    Keywords: difference set ; representation theory ; abelian group ; nonabelian group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Nontrivial difference sets in groups of order a power of 2 are part of the family of difference sets called Menon difference sets (or Hadamard), and they have parameters (22d+2, 22d+1±2 d , 22d ±2 d ). In the abelian case, the group has a difference set if and only if the exponent of the group is less than or equal to 2 d+2. In [14], the authors construct a difference set in a nonabelian group of order 64 and exponent 32. This paper generalizes that result to show that there is a difference set in a nonabelian group of order 22d+2 with exponent 2 d+3. We use representation theory to prove that the group has a difference set, and this shows that representation theory can be used to verify a construction similar to the use of character theory in the abelian case.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 37 (1986), S. 597-607 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé Un écoulement tourbillonnaire admettant une surface libre est susceptible de présenter des instabilités du type centrifuge, capillaire et Rayleigh-Taylor. Notre travail étend les critères de stabilité obtenus par Rayleigh et Synge respectivement pour des fluides parfaits et visqueux aux cas des configurations à surface libre.
    Notes: Abstract A swirl flow with a free surface is susceptible to centrifugal, capillary, and Rayleigh-Taylor instabilities. The present work extends the stability criteria of Rayleigh and Synge for inviscid and viscous fluids, respectively, to free-surface configurations.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 63 (1994), S. 103-110 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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