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  • Springer  (91)
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  • 1
    Electronic Resource
    Electronic Resource
    On the singing phenomenon in the offshore seismic experiments (1961)
    Springer
    Pure and applied geophysics 49 (1961), S. 61-74 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Offshore areas are sometimes found in which seismic record assumes the appearance of a sine wave or a simple combination of sine waves. It is more interesting to note that the dominant frequency on the singing records is the third harmonic of a fundamental whose wave length is four times the water depth. In this paper it has been proved that this peculiar phenomenon happens due to the slope of the sedimentary layer near the observational points. Using the method introduced byCovert (1958) of finding the Green's function for built in bodies, pressure field has been obtained in the water layer for a two dimensional point source in the same medium and it has been proved that due to the slope of the sedimentary layer singing is caused by waves of wave-length equal to four times the water depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01992144
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of cracks due to moving source over a thick crust (1963)
    Springer
    Pure and applied geophysics 54 (1963), S. 31-52 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary In this paper the problem of a point source of stress moving over the surface of a thick aelotropic plate resting of a rigid foundation has been considered. Following the method ofAleksandrov & Vorovich (1960) the stress componentsZ x andZ z have been expanded in series of ascending powers of 1/h when the source velocity is less than (c 44/ρ)1/2. When the velocity exceeds (c 44/ρ)1/2 it has been shown that two cracks are produced in different directions and their successive reflections at the upper and lower surface are also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01988253
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  • 3
    Electronic Resource
    Electronic Resource
    On the propagation of spherical waves due to large underground explosion (1969)
    Springer
    Pure and applied geophysics 72 (1969), S. 22-34 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary When a high explosive pressure acts on the boundary of a spherical cavity in an elastic medium, the material in a region around the charge behaves plastically and thereafter an elastic wave is propagated. Not only that but the elastic plastic boundary moves also with a certain velocity which is less than the elastic wave velocitySabodash [3]2). In this paper, firstly the case when the elastic plastic boundary moves with a velocityV 0. (V 0〈c) has been dealth with. The pressure in the elastic medium on this boundary has been assumed to be constant and equal toP 0. Secondly the case when the elastic plastic boundary moves with an exponentially decaying velocity has been considered. The pressure in the elastic medium on this boundary has also been assumed to be of exponential character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875689
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  • 4
    Electronic Resource
    Electronic Resource
    On reflection and diffraction of pressure waves from floating ice (1973)
    Springer
    Pure and applied geophysics 111 (1973), S. 2163-2176 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The diffraction of a pressure wave arising from the edge of the floating ice due to an incident wave of the formH[t−(x′cosθ/β)+ (y′sinθ/β)], whereH(t) is the Heaviside step function, has been studied. The ice sheet has been taken to be moving with a velocity much less than the velocity of sound in the liquid. The problem has been solved using an approximate method of solving Wiener Hopf problems. Finally, the pressure field at a large distance from the edge has been derived in a closed form evaluating the integrals by the saddle point method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940869
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of prolactin on human red cell sodium transport (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 1423-1425 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Incubation of red cells with higher concentrations of prolactin in vitro enhanced the cellular sodium level and produced a significant reduction in erythrocyte membrane adenosine triphosphatase activity. This effect was dose and time-dependent. It is the result of an inhibition of the active sodium pump similar to that produced by ouabain, suggesting altered red cell function and electrolyte balance in hyperprolactinemic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960139
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  • 6
    Electronic Resource
    Electronic Resource
    Van Vleck paramagnetism of charge-transfer compound (1975)
    Springer
    Naturwissenschaften 62 (1975), S. 392-392 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625350
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  • 7
    Electronic Resource
    Electronic Resource
    Plant regeneration from cotyledonary explants of jute, Corchorus capsularis L. (1999)
    Springer
    Plant cell reports 18 (1999), S. 544-548 
    Details
    ISSN: 1432-203X
    Keywords: Key wordsCorchorus spp ; Liquid culture ; Shoot-bud formation ; Plant regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A liquid culture protocol was developed to regenerate shoots from cotyledons of germinating seeds of jute (Corchorus capsularis L.). Reproducibility of the protocol was tested in three genotypes of jute. Highest bud differentiation rates into normal shoots (via shoot-forming explants) were obtained on modified Murashige and Skoog's liquid medium containing 2.7 μM α-naphthaleneacetic acid and 4.4 μM benzylaminopurine. Regenerated shoots were excised, and the best root formation could be induced in medium with 2.5 μM indole-3-butyric acid and 1.5% sucrose. Bud primordia were formed directly on the cut surface of the cotyledons. Scanning electron micrographs and histological studies confirmed the organogenic nature of the regenerated shoots. The physical condition of the culture medium and the age of the explants played crucial roles in the induction of shoot development using shoots; 2-day-old explants being optimal. Approximately 70% of the shoots were successfully established in soil after hardening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050619
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  • 8
    Electronic Resource
    Electronic Resource
    Über eine experimentelle Untersuchung der Kontaktdauer eines harten Hammers mit einer Klaviersaite. I (1930)
    Springer
    The European physical journal 66 (1930), S. 414-424 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390918
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  • 9
    Electronic Resource
    Electronic Resource
    Über eine Erweiterung der Wellenstatistik (1931)
    Springer
    The European physical journal 67 (1931), S. 699-701 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390984
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  • 10
    Electronic Resource
    Electronic Resource
    Structural features of the La-Sr-Fe-Co-O system (2001)
    Springer
    The European physical journal 21 (2001), S. 521-526 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.30.Vn Colossal magnetoresistance – 61.72.-y Defects and impurities in crystals; microstructure – 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A structural study has been performed on the La0.8Sr0.2FexCo1-xO3 (x = 0.025 to 0.3) system displaying large magnetoresistance (MR) at room temperature. A detailed analysis of the crystal structure and microstructure was done by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM). The atomic resolution TEM images and the appearing superreflections in the corresponding SAED patterns revealed that a superstructure is formed due to the presence of iron. The correlation between the ordered microstructure and the observed large MR ratio is discussed. 57Fe Mössbauer spectroscopy was utilized to gain information on the valence state of iron in the sample with x = 0.3. The lattice parameters of Fe- doped La0.8Sr0.2FexCo1-xO3 compounds were found to increase monotonously with increasing Fe content. The valence state of iron was found to be Fe3+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011125
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