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  • Articles  (22,163)
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  • Latest Papers from Table of Contents or Articles in Press  (15,653)
  • Articles: DFG German National Licenses  (6,510)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 23 (1974), S. 1-8 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Daten der thermischen Struktur der Atmosphäre, die mit dem mehrere Strahlungsbänder umfassenden SIRS-Instrument (Satellite Infrared Radiometer Spectrometer) des Nimbus III gemessen wurden, wurden zur Berechnung von Parametern der allgemeinen Zirkulation in der Nordhemisphäre herangezogen. Die thermische Struktur unterhalb der 10mb-Fläche wird mittels einer Regressionsmethode bestimmt, welche die Schichtdicke zwischen Isobarenflächen als abhängige Veränderliche benützt. Die täglich berechneten Parameter der allgemeinen Zirkulation umfassen die zonale mittlere und die wirbelpotentielle Energie sowie die zonale und wirbelkinetische Energie. Unabhängig davon wurden dieselben Parameter von Netzdaten des National Meteorological Center (NMC) bestimmt. Ein Vergleich zwischen den beiden Kollektiven von Daten zeigt, daß Maxima, Minima und allgemeine Tendenzen in beiden Berechnungen gut übereinstimmen. Die mittels SIRS berechneten Energiewerte stellen allerdings eine Unterschätzung dar. Die Energieveränderungen in der mittleren Stratosphäre während des Zusammenbruches des Polarwirbels werden als Beispiel angeführt.
    Notes: Summary General circulation parameters in the northern hemisphere are calculated using atmospheric thermal structure obtained from Nimbus III SIRS multi-channel radiance information. The thermal structure up to 10 mb is obtained by using a regression technique with thickness between pressure levels as the dependent variable. General circulation parameters calculated on a daily basis include zonal and eddy available potential energy, and zonal and eddy kinetic energy. A second set of calculations is performed using National Meteorological Center (NMC) grid data. A comparison of the two sets of calculations indicates that, although the energies calculated from the SIRS-derived structure underestimate the actual energies, maxima, minima and trends are well identified. An example of mid-stratospheric energy changes during a breakdown of the polar-night vortex is also given.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 23 (1974), S. 13-27 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Der Gesamtozongehalt kann auf globaler Basis täglich von Satelliten aus gemessen werden, die die Erde umkreisen. Solche Messungen wurden durch den Nimbus-III-Satelliten durchgeführt. Ein Vergleich der zeitlichen und longitudinalen Veränderlichkeit der von der Stratosphäre emittierten langwelligen Strahlung in 60° südlicher Breite mit dem Gesamtozongehalt zeigte, daß niedrige (hohe) Strahlungswerte gut mit niedrigen (hohen) Gesamtozonwerten übereinstimmen. Die Phasengeschwindigkeit der nach Osten wandernden “Ozonwellen” ist in der Winterhemisphäre am größten. Die Ostwärtsbewegung nimmt gegen niedere Breiten der Winterhalbkugel ab. In äquatorialen Breiten scheinen sich die Wellen langsam gegen Westen zu bewegen. Im Sommer der Nordhemisphäre wandern die Wellen langsam gegen Osten. Die Intensität der “Ozonwellen” ändert sich ebenfalls mit der geographische Breite. Die zeitlichen und räumlichen Änderungen im Gesamtozongehalt sind hauptsächlich an die Bewegungen troposphärischer Drucksysteme geknüpft. Die starken, horizontalen Ozongradienten, welche häufig in der Winterhemisphäre beobachtet wperden, hängen mit intensiven baroklinen Zonen in der unteren Stratosphäre und der oberen Troposphäre zusammen, die sich ebenfalls nach Osten hin bewegen. Unter Annahme einer gleichförmigen zonalen Grundströmung konnten in der Ozonverteilung Rossby-Wellen festgestellt werden, deren Wellenlänge zwischen 2500 und 3700 km variierte.
    Notes: Summary With total ozone sensors on earth-orbitung satellites the ozone distribution over the entire earth may be measured daily. The conclusions from some of the Nimbus III measurements are discussed in this paper. A comparison of time-longitude variations of stratospheric radiance values at 60°S with values of the total ozone indicated that low (high) radiance values correspond very closely with the low (high) total ozone amounts. The speed at which these ozone ‘waves’ progress eastward is greatest in the winter hemisphere. The speed of eastward progression decreases as one approaches the lower latitudes in the winter hemisphere. In the equatorial region the progression of the ozone ‘waves’ appears to be slowly westward. In the Northern Hemisphere the waves progress slowly eastward during summer. The intensity of the ozone ‘waves’ was also observed to change with latitude. These temporal and spatial fluctuations are related mainly to the motion of dynamic tropospheric systems. The extremely tight ozone gradients, which may be seen in the winter hemisphere data, have been shown to be associated with strong baroclinic zones in the lower stratosphere and upper troposphere, which are moving eastward. Assuming uniform zonal velocity we found Rossby wavelengths that varied from 2500 to 3700 km.
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  • 3
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    Springer
    Papers in regional science 32 (1974), S. 203-212 
    ISSN: 1435-5957
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Economics
    Notes: Conclusion I have argued that the current thrust toward land use planning on an extensive scale is a significant movement. It appears to respond to real societal forces and has mustered a consensus, albeit one that appears to have serious internal conflicts. For planners and regional scientists, the creation of regional planning agencies offers more than the opportunity for jobs. We have argued for many years that we are developing theories and techniques that allow us to understand regional phenomena in ways that are pragmatic and useful. Some of us may have the opportunity to find out how real those claims are. Our future as organized professional groups may depend on the answer.
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  • 4
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    Springer
    Papers in regional science 33 (1974), S. 13-31 
    ISSN: 1435-5957
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Economics
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  • 5
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    Rheologica acta 13 (1974), S. 199-208 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Summary It has been experimentally observed that one-inch thick soil-cement slab (fine-grained soil), upon drying from the top face, first deforms with a concave surface at the top and gradually assumes an opposite curvature with convex surface at the top. The latter shape contradicts the classical analysis ofPickett. A theory whereby the doming can be predicted is proposed in this paper. Moisture migration in the drying slab is determined by the unsaturated capillary flow theory, modified to account for the fact that soil-cement will exhibit hysterisis in the relation between pressure head (capillary tension) and its moisture content. By postulating that moisture tension (stress) results in deformation or shrinkage, a relation between shrinkage and moisture tension is obtained from experimental data. The results seem to violate an intuitive feeling that the exposed top face should shrink more than the sealed bottom face. The creep compliance of soil-cement specimens is determined for a range of humidities from 55–100%. Finite difference techniques have been employed to compute the relaxation modulus from creep compliance which are related throughBoltzmann integral. To include the dependence of the modulus upon a variable humidity field, constitutive law is modified on the basis of time-humidity equivalence hypothesis. Imposing on the theoretical shrinkage distribution, computations for stresses and deflections are made from two points of view: 1. Using the simplifying assumption that the relaxation modulusG(t) does not vary with humidity and 2. allowing for the humidity variation in the transient problem and using a generalG(t, H). The solution from the first point of view is obtained by equivalent shrinkage concept and from the latter by finite element method. The computed deflections not only predict doming but also show good agreement with the observed values. It should be noted that the current theory predicts deflections opposite to those predicted by conventional analysis when the moisture movement is assumed to be governed by diffusion law and shrinkage to be proportional to moisture loss.
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  • 6
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    Rheologica acta 13 (1974), S. 223-227 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Die Formeln für die Bestimmung der Schwellrate von Kunststoffschmelzen wurden behandelt. Die kritischen Bedingungen für die Ergebnisse von Schmelzbruch und Schwellrate sind kombiniert, um das Flußverhalten beim Einsetzen der Instabilität zu erklären. Es wurde dargestellt, daß der Faktor $$\bar M_z \bar M_{z + 1} /\bar M_w^2 $$ in der Schwellrate sowie im Schmelzbruch der wichtigste Parameter ist.
    Notes: Summary The equations for determining die swell of molten polymers are discussed. The critical conditions for melt fracture and die swell results are combined in order to explain the flow behavior at the onset of instability. It is shown that the factor $$\bar M_z \bar M_{z + 1} /\bar M_w^2 $$ is the most important parameter in die swell and melt fracture studies.
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  • 7
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
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  • 8
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    Rheologica acta 13 (1974), S. 236-240 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Résumé Les premiers essais réalisés sur la planche à peindre nous ont permis de chiffrer l'ordre de grandeur des efforts d'application et de mettre en évidence l'importance pour une peinture donnée, du rapport de l'effort normal sur l'effort tangentiel. Cette technique simple peut permettre un contrôle rapide, en cours de fabrication, de la brossabilité d'une peinture. Toutefois la mise au point d'un applicateur automatique éliminant sur les résultats la dispersion due au peintre semble indispensable si l'on veut lier la brossabilité aux caractéristiques rhéologiques d'une peinture.
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  • 9
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    Springer
    Rheologica acta 13 (1974), S. 265-273 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Summary In order to investigate the short time response of solid polymers, a high resolution laser interferometer has been employed to observe the detailed structure of stress waves produced by the impact of polymeric plates. From the observed stress waves the loading and unloading stress-strain paths followed by the material can be determined. For the polymer, polymethyl methacrylate, over the stress range from 0–60 kbar such observations have disclosed a stress-strain behavior which exhibits large strain nonlinearities and significant rate-dependence. For stress levels below ≈7 kbar and above ≈40 kbar, rate-effects are of secondary importance and the observed wave profiles may be modeled using a nonlinear elastic description of the material behavior. However, at about 7 kbar, a transition is observed in the dynamic stress-strain behavior which is characterized by greater stress relaxation and significant hysteresis upon unloading. This transition, which we attribute to a yield phenomenon, requires a rate-dependent description of the material behavior to be used in the stress range of approximately 7–40 kbar.
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  • 10
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    Springer
    Rheologica acta 13 (1974), S. 289-295 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
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