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  • 1
    Monograph available for loan
    Monograph available for loan
    Berlin [u.a.] : Springer
    Associated volumes
    Call number: 19/O 2011(124)
    In: Die Grundlehren der mathematischen Wissenschaften
    Type of Medium: Monograph available for loan
    Pages: X, 249 S. : graph. Darst
    Series Statement: Die Grundlehren der mathematischen Wissenschaften in Einzeldarstellungen mit besonderer Berücksichtigung der Anwendungsgebiete 124
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 52 (1962), S. 104-114 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary It is shown that hydraulic fracture pressures are related to the stresses in the formation and the strength of the rock composing it. Using the Coulomb-Mohr failure criterion and the principle of effective stress, expressions can be obtained relating these factors. The theory indicates that in areas characterized by thrust faulting, the fractures will be inclined horizontally whereas in areas subject to normal faulting stress conditions, they will be more vertical. The analysis of some field data gives reasonable results.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 58 (1964), S. 123-128 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary During uniaxial compression of clay cylinders it was observed that the longitudinal velocity decreased as each load increment was applied and then increased under constant stress. It is suggested that the load increment induces an increase in pore water pressure thereby reducing the effective stress. The velocity is dependent upon the effective stress and it decreases accordingly. The velocity then increases due to the dissipation of the pore pressure.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 17 (1964), S. 0 
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: A model of the form xt - xt-1= etwhere xt is the price of a share at time t and et forms a sequence of independent random variates is postulated as a model of the price determining mechanism of stock markets.The form of the distribution function of the et's is investigated. In opposition to suggestions that have been made in connection with other speculative price mechanisms it is found that the distribution function appears to be well approximated by a normal distribution. There is no evidence that the data treated are samples from a stable process with an infinite variance.It is found that the model mentioned above, termed the random-walk model, provides a good explanation of the variation of stock market prices for daily observations of the price, and for the series formed by the price of every transaction taking place in the market. In the context of this model it is noted that it appears that the price determining mechanism continues to operate at a reduced ‘speed’ during times when the actual market is closed.While it has been suggested that a correlation between the volume of shares transacted and the absolute value of the first differences of the price series should be expected, no such correlation was observed.Two questions which the paper leaves open are the question of cross-sectional correlation between different shares, and the question of the possibility of information in moments of order greater than two.In conclusion the following law is stated: ‘The price determining mechanism described in Section II (i. e. the random-walk indicated above) is the only mechanism which is consistent with the unrestrained pursuit of the profit motive by the participants in the market’.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 16 (1963), S. 0 
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: New York stock price series are analyzed by a new statistical technique. It is found that short-run movements of the series obey the simple random walk hypothesis proposed by earlier writers, but that the long-run components are of greater importance than suggested by this hypothesis. The seasonal variation and the ‘businesscycle’ components are shown to be of little or no importance and a surprisingly small connection was found between the amount of stocks sold and the stock price series.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 559-560 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is well known that masses of sand or assemblages of steel balls undergo irreversible changes in volume when subject to shear stresses. An important feature of these materials is that regardless of the initial porosity of the packing, the dilatation stops when the porosity reaches a value that ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 1 (1961), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zusammenfassung. Samen von Sinapis arvensis (Ackerscnf) und Avena fatua (Fiughafer) wurden indirekt liber die Wurzeln in Wasserkultur aufwachsender Pflanzen mil S-35 markiert. Die spezilische Aktivität der Nährlösung betrug für Sinapis 0,75 μ C.cm−3 und für Avena 1,0 μ C.cm−3. Die Sinapis-Samen besassen bei der Ernte (0,88 Halbwertzeiten nach der Markierung) einc Aktivitat von 0,11 μC pro Einzelsame und 59,4 μC pro Gramm Samen. Die entsprechenden Werte für Avena waren nach 0,91 HWZ 0,24 μC und 21,2 μC. Die aus den markierten Samen aufwachsenden Keimpflanzen konnten ohne vorherige Präparation unter einem dünuwandigen Endfensterzählrohr von nicht markierten Keimpflanzen eindeutig unterschieden werden. Dabei betrug die Aktivität der Keimblätter von Sinapis nach einer HWZ ca. 1000 Imp./min., diejenige von Avena noch nach mehr als 4 HWZ 60-80 Imp./min. Em sicherer Nachweis (doppelter Nulleffekt) von S-35 in den unpräparierlen Keimblättern ist bei Sinapis für einen Zeitraum von 5 HWZ, für Avena von 4 HWZ nach der Markierung möglich. Die beschriebene Markierungs-methode eignet sich daher auch für Samen mit längerer Keimruhe, wie am Beispiel von A. fatua gezeigt werden konnte. Um die Brauchbarkeit der markierungsmethode auch unter Feldbedingungen prüfen zu können, wurden im Herbst 1960 auf 4 Parzellen von je 2 m2 Grösse eincs abgeernteten Gerstenfeldes jeweils 2000 markierte Samcn von Sinapis arvensis, die kurz vorher im Gewächshaus zur Reife gelangt waren, eingesät. Die einzelnen Parzellen wurden anschliessend einer verschiedenen Bodenbearbeitung unlerworfen und danach die aufgehenden markierten Keimpflanzen zu verschiedenen Zeitpunkten ausgezählt. Dabei ergaben sich folgende Keimprozente: Unbearbeitete Parzelle: 11,8%; Schälpflug: 4,7%; schwere Egge: 48,7%; Scheibenegge: 31,1%. Auch bei diesen Versuchen war es mit Sicherheit möglich, eine Unterscheidung der aus unmarkierten und markierten Samen aufwachsenden Keimpflanzen vorzunehmen.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 163-164 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FLAVONOID compounds of higher plants have JL received considerable attention from diverse fields of study1-9. Their biological role, however, is for the most part unknown2'7'10 with the possible exception of lignin formation7 and attracting insects for pollination2'7'10. Vesicle stalks from mature ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 116-116 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 13 (1963), S. 226-230 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two shorter wave-length emission bands have been observed in activated alkali iodides atγ — and light excitation apart from activator emission. The shortest wave-length band, observed only at low temperatures, is excited in exciton absorption bands and it may be due to exciton emission. This emission has greater intensity in unactivated crystals grown from the solution. We have observed this emission on CsI, KI and RbI crystals. The intermediate emission band is excited in a narrow excitation band, situated on the sharp slope of the fundamental absorption in crystals and it can apparently be ascribed to structural defects.
    Type of Medium: Electronic Resource
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