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  • Life and Medical Sciences  (3,905)
  • Seismology
  • Temperatur
  • 1980-1984  (3,791)
  • 1930-1934
  • 1915-1919
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 118 (1980), S. 1170-1178 
    ISSN: 1420-9136
    Keywords: Seismology ; Love waves ; Laterally nonhomogeneous layer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Rayleigh's principle and the concept of the local wave number have been utilised for the approximate determination of the dispersion of Love waves propagating in a laterally heterogeneous layer lying over a homogeneous half-space. The shear wave velocity and the rigidity in the surface layer have been assumed to decrease with the increase of the lateral distance from the origin. The range of validity of the dispersion equation obtained by this method has been examined critically. It was found that: (a) for existence of Love waves the minimum value of shear wave velocity in the layer must be less than that in the matter below, and (b) the phase velocity of Love waves decreases with the increase of the lateral distance from the origin.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 118 (1980), S. 1209-1213 
    ISSN: 1420-9136
    Keywords: Seismology ; Phase velocity dispersion ; Rayleigh waves ; ‘Hedgehog’ inversion method ; Lithosphere-asthenosphere system in Europe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Long-period recordings of dispersive Rayleigh waves along numerous station lines, or ‘profiles’, in Europe have for the first time permitted a uniform inversion of these observations based on a new method of phase velocity regionalization. Regional dispersion relations obtained by this method have then been subjected to a complete inversion procedure commonly known as the ‘hedgehog’ method. The results are presented in a map outlining the thickness of the lower lithosphere (‘lid’) and the shear (S) velocities in both the ‘lid’ and the asthenosphere ‘channel’. A comparison of these results with the minimum compressional (P) wave velocities in the asthenosphere and their corresponding depths provides an estimate of theV p /V s ratio for the asthenosphere in the European area.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 120 (1982), S. 583-606 
    ISSN: 1420-9136
    Keywords: Seismology ; P-wave residuals ; Three-dimensional velocity inversion ; Velocity structure of Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Jeffreys-Bullen P and PKP travel-time residuals observed at more than 50 seismic stations distributed along Italy and surrounding areas in the time interval 1962–1979, indicate the complex velocity pattern of this region. Strong lateral velocity inhomogeneities and low velocity zones are required to explain the observed pattern of residuals. In particular, late arrivals of about 1 sec are observed in the Apenninic mountain range, requiring both greater crustal thickness and low velocity layers, coherent with seismic refraction data and surface wave dispersion measurements. The seismic stations located in the Western and Eastern Alps indicate the presence of high velocities. In the Western Alps the strong azimuthal variation of residuals and the high values of early arrivals have a close relationship to the Ivrea body, an intrusive crustal complex characterized by a velocity as high as 7–7.2 km/sec. A travel-time inversion performed with theAki et al. (1977) block model, confirms the peculiar characteristics and the sharp variations in the lithosphere of the whole Italian region, with values of velocity perturbations between many adjacent blocks, ranging in size from 50 to 100 km, and independent from the earth parametrization chosen, reaching values up to 10% in the lithospheric part and 5% in the asthenosphere. 3-D inversion requires also high velocity along the Tyrrhenian coastal margin, equivalent to an uprise of major crustal and lithospheric discontinuities along this part of the Italian peninsula. Moreover low velocity material must be present in the northern part of the Adriatic foreland, in the lithosphere-asthenosphere system, closely related to the stress and seismicity pattern, and the lateral bending of the lithosphere in the same region.
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  • 4
    ISSN: 1871-4528
    Keywords: Altersresistenz ; Temperatur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The effect of soil moisture on the growth and development of the potato cultivar Uran and on the proportion of virus-infected tubers was investigated in a 4-year series of pot experiments. Soil moisture was adjusted to two levels; dry and optimum, at various times before and after inoculation. One isolate each of the strains PVYN and PVYO were used in each case to inoculate the plants. Tuber infection was recorded 60 days after inoculation and at maturity. Dry conditions during the growing period checked growth, delayed flowering, lengthened the growing period, and reduced tuber yield, which was at its lowest when dry conditions were maintained from flowering to harvesting. The percentage virus-infested tubers from plants in dry conditions was approximately twice that of plants grown under optimum conditions (Table 1). This applied however only to infections with PVYN. Almost all tubers were infected with PVYO regardless of soil moisture content. Low temperatures after inoculation presented tuber infection by both isolates (Table 2).
    Abstract: Résumé L'influence de l'humidité du sol sur la croissance et sur le taux de tubercules atteints par le virus Y, a été examinée par un essai en pots pendant 4 ans, avec la variété de pomme de terre Uran contaminée par le PVY. Deux procédés d'humidité du sol ont été examinés: des conditions arides et une humidité optimale avant l'inoculation et pendant des périodes de différente durée après l'inoculation. Pour l'inoculation des plantes, des souches de virus PVYN et PVYO ont été utilisées. Les tubercules ont été examinés 60 jours après l'inoculation, et à la maturité complète des plantes. Les conditions de sécheresse ont freiné la croissance, retardé l'époque de floraison, prolongé la période de végétation et influencé le rendement d'une manière négative. Le rendement le plus bas a été obtenu lorsque la sécheresse s'étendait de la floraison à la récolte. Comparativement aux plantes cultivées dans des conditions optimales d'humidité, le manque d'eau a eut pour effet de doubler le nombre de tubercules contaminés par le virus (tableau 1). Ce dernier résultat est cependant valable uniquement pour la souche PVYN, tandis que pour la souche PVYO, les tubercules étaient pratiquement tous contaminés indépendamment du taux d'humidité. Les températures basses après l'inoculation ont empêché la contamination des tubercules pour les deux souches de virus (tableau 2).
    Notes: Zusammenfassung Der Einfluss von Bodenfeuchtigkeit und Temperatur auf die Höhe des Knollenbefalls wurde an der Kartoffelsrote ‘Uran’ für je ein Isolat der Kartoffelvirus-Y-Stammgruppen PVYN und PVYO in Topfversuchen ermittelt. Pflanzen, die nach Inokulation mit PVYN zu verschiedenen Zeiten der Trockenheit ausgesetzt waren, zeigten et wa doppelt soviel infizierte Knollen als diejenigen, die bei optimalen Feuchtigkeitsverhältnissen aufwuchsen. Nach Inokulation mit PVYo wurden solche Unterschiede nicht festgestellt, die Knollen waren hier in allen Fällen fast vollständig befallen. Niedrige Temperaturen nach der Inokulation verhinderten bei beiden Virusisolaten weitgehend den Befall der Knollen.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 26 (1915), S. 1-41 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 26 (1915), S. 97-108 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 26 (1915), S. 109-141 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 26 (1915), S. 359-386 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 26 (1915), S. 563-624 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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