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  • 1
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    The @classical review 44 (1994), S. 129-130 
    ISSN: 0009-840X
    Source: Cambridge Journals Digital Archives
    Topics: Classical Studies
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Cambridge University Press
    Studies in second language acquisition 13 (1991), S. 408-409 
    ISSN: 0272-2631
    Source: Cambridge Journals Digital Archives
    Topics: Linguistics and Literary Studies
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Cambridge University Press
    Studies in second language acquisition 14 (1992), S. 482-483 
    ISSN: 0272-2631
    Source: Cambridge Journals Digital Archives
    Topics: Linguistics and Literary Studies
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Cambridge University Press
    Studies in second language acquisition 12 (1990), S. 88-90 
    ISSN: 0272-2631
    Source: Cambridge Journals Digital Archives
    Topics: Linguistics and Literary Studies
    Type of Medium: Electronic Resource
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  • 5
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    London : Periodicals Archive Online (PAO)
    Journal of historical geography. 18:4 (1992:Oct.) 377 
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  • 6
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    Unknown
    London : Periodicals Archive Online (PAO)
    Journal of historical geography. 16:3 (1990:July) 335 
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    World journal of surgery 16 (1992), S. 384-388 
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La mortalité par accidents de la route est de 500,000 par an dans le monde, et ne cesse d'augmenter d'année en année. Quatre pays, la Chine, l'Inde, la Russie et les Etats-Unis ont atteint le niveau de 45,000 à 50,000 morts par accident de la route par an, bien que les aspects du problème diffèrent beaucoup d'un pays complètement motorisé des autres pays, “en voie de motorisation”. Dans les pays en voie de motorisation, le taux de mortalité pour 10000 véhicles est beacoup plus élevé que dans les pays motorisés; de même, le “débit” sur le réseau routier est plus varié. Le financement de la recherche pour la réduction des accidents de la route est proportionnellement beaucoup moins favorisé que pour celle des maladies cardiaques, du cancer ou celui du SIDA. Ceci est dû, en partie, au fait que beaucoup de gouvernments considèrent et traitent le problème des accidents de la route comme un problème du transport ou de police, et non pas comme un véritable problème de santé publique. On plaide ici pour un échange des connaissances technologiques permettant de réduire le nombre d'accidents des pays complètement motorisés vers les pays en voie de motorisation.
    Abstract: Resumen Las cifras de muertes por accidentes de tráfico a nivel mundial son del orden de 500,000 por ano, y en ascenso. Cuatro naciones—China, India, Rusia y los EUA—han alcanzado niveles de 45,000–50,000 muertes por año, aunque la naturaleza del problema es bien diferente en los países totalmente motorizados que en los países en vía de motorización; en los últimos las tasas de muerte por 10.000 vehículos automotores son bastante más altas que en los países motorizados, y el flujo del tráfico es mucho más variado. La investigación sobre reducción de accidentes de tráfico recibe bastante menores recursos que la investigación sobre enfermedad cardíaca, cáncer o SIDA. Se sugiere que esto se debe en parte a que los gobiernos no ven ni tratan el problema de los accidentes de tránsito como uno de salud pública, sino sólo como un problema del transporte, un problema de policía. Se plantea la necesidad de establecer mecanismos globales para la transferencia de las tecnologías relativas a la reducción de accidentes de tráfico de las naciones totalmente motorizadas a las naciones en vía de motorización.
    Notes: Abstract Worldwide, traffic deaths are 500,000 per year and growing. Four nations, China, India, Russia, and the United States of America, have reached levels of 45,000–50,000 traffic deaths per year, although the nature of the problem is quite different in fully motorized countries from what it is in motorizing countries. In motorizing countries the death rates per 10,000 motor vehicles are much higher than in motorized countries, and also the traffic stream is much more varied. Research for the reduction of traffic injuries is funded at a proportionately much lower level than that for heart disease, cancer, or AIDS. Part of the reason for this is the failure of governments to view and to treat the problem of traffic injuries as a public health problem, but rather to view it solely as a transport problem or as a police matter. A case is made for global mechanisms for the transfer of traffic injury reducing technology from fully motorized nations to motorizing nations.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 87 (1991), S. 532-538 
    ISSN: 1432-1939
    Keywords: Resource competition ; Resource foraging ; Dominance ; Plasticity ; Dry matter allocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary There is widespread uncertainty about the nature and role of morphological plasticity in resource competition in plant communities. We have assayed the foraging characteristics of leaf canopies and root systems of eight herbaceous plants of contrasted ecology using new techniques to create controlled patchiness in light and mineral nutrient supply. The results are compared with those of a conventional competition experiment. Measurements of dry matter partitioning and growth in patchy conditions indicate a consistent positive association between the foraging characteristics of roots and shoots, supporting the hypothesis of strong interdependence of competitive abilities for light and mineral nutrients. Differences are identified in the abilities of dominant and subordinate plants to forage on coarse and fine scalcs. It is suggested that a trade-off exists in the scale (“high” in dominants) and precision (high in subordinates) with which resources are intercepted and that this trade-off contributes to diversity in communities of competing plants.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1572-9680
    Keywords: decomposition ; litter quality ; savannas ; soil microbiology ; soil organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract An investigation into the influence of indigenous trees on soil fertility was conducted in an area of semi-arid tropical savanna in Zimbabwe on two contrasting soil types: dystrophic savanna soils (sandy soils) and eutrophic savanna soils (fine-textured soils). The study adds further support to the growing literature showing that trees have a positive influence on soil fertility. The study suggests that tree clearance, as advocated in these agropastoral systems, may not necessarily result in long-term benefits. It is argued that the primary mechanism by which soil fertility is improved is through increased litter and soil organic matter compartments under trees. The influence of trees on cation levels is greater on sandy soils than fine-textured soils because the exchange capacity of fine-textured soils is determined largely by soil texture whereas organic matter is the prime determinant of exchange capacity in sandy soils. The present study demonstrates that fertility improvement under trees is not at the expense of fertility decline in the surface soils of the zone around the tree. Leaf quality, as reflected simply in leaf C:N ratio, influences decomposition rates but the activities of termites probably confound any simple relationship. Litter quality of tree species is probably important in determining levels of soil organic matter under canopies, with higher levels under species with lower leaf quality.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Agroforestry systems 14 (1991), S. 99-111 
    ISSN: 1572-9680
    Keywords: fodder trees ; fruit trees ; gardens ; grazing area ; species composition ; traditional agroforestry practices ; Zimbabwe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Traditional agroforestry systems in the communal areas of Zimbabwe are described. There are systems centered on main fields, on home gardens, on homesites and on grazing areas. In the main fields, the major tree-related management practice is the conservation of preferred indigenous fruit trees. Fruit trees are also the focus of forestry activities around the gardens and the homesite; but here it is the planting of exotic species. In a localized area of Zimbabwe Acacia albida is important in fields. There is almost no use of tree fallows in Zimbabwe. Trees in grazing areas have numerous roles, but at present there is little knowledge about traditional management practices in these areas. In the development of agroforestry systems in Zimbabwe it is suggested that those systems designed to improve fodder production will make a significant contribution to farm productivity because of the importance of cattle in the farming system and the present fodder shortage. Interventions involving the planting of fruit trees are likely to be very successful, as there is much interest in such planting. Another area that needs to be developed is that of tree plantings to improve soil fertility.
    Type of Medium: Electronic Resource
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