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  • Springer  (178)
  • Institute of Physics  (135)
  • Springer Nature  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Chapter 7 DEA multiplier analytic center sensitivity with an illustrative application to independent oil companies (1996)
    Springer
    Annals of operations research 66 (1996), S. 163-177 
    Details
    ISSN: 1572-9338
    Keywords: Efficiency sensitivity ; interior point algorithm ; analytic centers ; potential data errors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The setE of extreme points which are also efficient are of basic importance in defining the efficiency frontier, from which the observations for all other DMUs are evaluated in DEA. A significant question which we address is “What variations in the data can be tolerated before the membership inE is changed?” This topic is explored using (1) a simple illustrative example, and (2) production data for 30 independent oil companies during the period 1983–1985. Data were allowed to vary simultaneously for all observations and in different subsets determined by random drawings of data for points both inE and not inE. The results were found to be robust in this study, thereby lending further support to earlier studies which also found these classifications into efficient and inefficient performers to be robust in DEA. Technical developments for these new methods of sensitivity analysis are supplied. These developments feature an application of analytic center (interior point) algorithms which ensure that the Strong Complementary Slackness Condition (SCSC) is fulfilled. The solutions satisfy a mathematical condition called “centrality”. Generally, the solutions are at interior points calledanalytic centers. At these interior points, continuity of the input-output ratios ensures that DMUs inE remain inE for at least small relative variations in the data, while empirically these properties have been found to extend to much larger variations in the data sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187299
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  • 2
    Electronic Resource
    Electronic Resource
    Systematic study of low-mass electron pair production in p–Be and p–Au collisions at 450 GeV/ $c$ (1998)
    Springer
    The European physical journal 4 (1998), S. 231-247 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. In a joint effort the CERES/NA45 and TAPS collaborations have measured low-mass electron pairs in p–Be and p–Au collisions at 450 GeV/ $c$ at the CERN SPS. In the range covered up to $\approx$ 1.5 GeV/ $c^2$ the mass spectra from p–Be and p–Au collisions are well explained by electron pairs from decays of neutral mesons. For p–Au our result is new. For p–Be, the simultaneously measured electron pair inclusive pair spectrum in which instrumental uncertainties are highly reduced. We confirm the earlier finding of HELIOS-1 with significantly reduced systematic uncertainties of 23% in the mass range below 450 MeV/ $c^2$ , and of 28% in the mass range above 750 MeV/ $c^2$ at 90% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050204
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  • 3
    Electronic Resource
    Electronic Resource
    A generalized stefan condition (1979)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 30 (1979), S. 749-755 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zussamenfassung In dieser Arbeit wenden wir die Theorie der Oberflächen-Thermodynamik auf die Bestimmung der Sprungbedingung für den Wärmefluss an einer Schmelzfläche an. Wir trennen die Oberflächenspannungs-Effekte von den Oberflächenenergie-Effekten und beschreiben Beziehungen zwischen den beiden, die eine Vergrösserung oder Verkleinerung der Oberflächenkrümmung bedingen können.
    Notes: Summary In this paper we apply the theory of surface thermodynamics to find the jump condition on heat flux across a melting-surface. We distinguish between the effects of surface tension and of surface energy and describe relations between the two which may ensure enhancement or diminution of the curvature of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590684
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  • 4
    Electronic Resource
    Electronic Resource
    Continuous norms on Fréchet lattices (1989)
    Springer
    Archiv der Mathematik 52 (1989), S. 155-158 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191268
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  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructural study of patch-graft re-endothelialization (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 775-777 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary On the 8th post-operative day, an endothelial layer covers the ‘venous patch’ luminal part when the adventitia of the patch is sutured to a 5–8 mm-long arteriotomy performed in the common carotid of the rat. The probable origin of this secondary endothelium is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01967973
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  • 6
    Electronic Resource
    Electronic Resource
    Smooth muscle cells in ‘venous patches’ grafted into the rat common carotid artery. A structural study (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 122-124 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the 2nd week after surgery, well differentiated smooth muscle cells (SMC) were evident in the walls of venous patches in rat common carotid artery. Gap junctions were the only type of intercellular junction observed between SMC in the present study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944565
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of streptozotocin diabetes on adenosine-5′-triphosphate, oxygen consumption and steroidogenesis in testis mitochondria from rats (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 907-908 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The activity of the enzyme cleaving the side-chain of cholesterol (rate limiting step in steroidogenesis) was considerably reduced in experimentally induced diabetes. This result was accompained by both an increase in oxygen consumption and an increase in ATP synthesis. Insulin treatment prevented them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953646
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  • 8
    Electronic Resource
    Electronic Resource
    Variation of Shear-wave Residuals and Splitting Parameters from Array Observations in Southern Tibet (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 407-431 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Shear waves, anisotropy, Tibet.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —A tight array of seismographs spanning a 500 km traverse of southern Tibet resolved anisotropy from SKS with a spatial variation of its direction and an increase northward of the splitting delay, as well as of its first arrival residual. Both waves split by velocity anisotropy are slow relative to P and their waveform analysis may be interpreted to suggest attenuation anisotropy. The array here provides examples of residuals and splitting of other S waves which do not tightly conform to the anisotropy assumed in the simplest model of olivine of transverse isotropy with horizontal symmetry axis. S waves are also split, with parameters which vary along the array, and hence are relevant to near-receiver structure like those of SKS. Their splitting delay, for non-vertical incidence and polarization, appears larger than that for SKS. Residuals of S-wave first arrivals and splitting delays increase less northwards for S than SKS. Anisotropy with a slow vertical axis may account for these observations. Its origin may be related to horizontal shear or flow in low-velocity layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050120
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  • 9
    Electronic Resource
    Electronic Resource
    Anisotropy beneath the Iberian Peninsula: The Contribution of the ILIHA-NARS Broad-band Experiment (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 395-405 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Anisotropy, shear-wave splitting, Iberian Peninsula, regional variations.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The presence of anisotropy beneath the Iberian Peninsula and its main distinctive features can be established through the analysis of teleseismic shear-wave splitting observed in the ILIHA-NARS experiment. In this experiment, an homogeneous data set is provided by a network of 14 broad-band stations deployed over the entire peninsula for about one year. Even if technical problems led to an amount of data smaller than expected, significant variations in the inferred fast velocity direction are observed for stations located in different Iberian domains. The stations in Central and East Iberia show a fast velocity direction oriented roughly E–W, coincident with previous results in Toledo. A clearly different NE–SW direction is observed in the Ossa-Morena zone, supporting the image from a previous regional experiment. The observed delay times lie between 0.5 and 1 s. Although large-scale mechanisms, such as the absolute plate motion of Eurasia, can be invoked to explain the origin of anisotropic features in many sites, the regional variations observed in some domains imply that differentiated origins of the anisotropy have to be considered, probably related to the particular tectonics in the area. An interesting example of this fact is provided by the stations in the Betic chain; the fast velocity direction inferred for a station located in the limit of the External Betics (South Iberian domain), oriented N80°E, is clearly different from the N15–35°E direction observed in the Internal Betics (Alboran crustal domain), the origin of which has to be related to the Alpine building of the chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050119
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  • 10
    Electronic Resource
    Electronic Resource
    Isomorphic classification of the spaces $H^k_{\rm loc}(\Bbb R)\cap L^2(\Bbb R)$ (1999)
    Springer
    Archiv der Mathematik 73 (1999), S. 33-41 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We give a representation of the spaces $H^k_{\rm loc}(\Bbb R)\cap L^2(\Bbb R)$ as Köthe sequence spaces and use some recent topological invariants to investigate their isomorphic classification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000130050017
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