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  • Springer  (238)
  • 2020-2023
  • 1985-1989  (136)
  • 1975-1979  (88)
  • 1935-1939  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    On box totally dual integral polyhedra (1986)
    Springer
    Mathematical programming 34 (1986), S. 48-61 
    Details
    ISSN: 1436-4646
    Keywords: Total Dual Integrality ; Hilbert Basis ; Polyhedra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Edmonds and Giles introduced the class of box totally dual integral polyhedra as a generalization of submodular flow polyhedra. In this paper a geometric characterization of these polyhedra is given. This geometric result is used to show that each TDI defining system for a box TDI polyhedron is in fact a box TDI system, that the class of box TDI polyhedra is in co-NP and is closed under taking projections and dominants, that the class of box perfect graphs is in co-NP, and a result of Edmonds and Giles which is related to the facets of box TDI polyhdera.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01582162
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  • 2
    Electronic Resource
    Electronic Resource
    Sensitivity theorems in integer linear programming (1986)
    Springer
    Mathematical programming 34 (1986), S. 251-264 
    Details
    ISSN: 1436-4646
    Keywords: Integer Linear Programming ; Chvátal Rank ; Cutting Planes ; Sensitivity Analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We consider integer linear programming problems with a fixed coefficient matrix and varying objective function and right-hand-side vector. Among our results, we show that, for any optimal solution to a linear program max{wx: Ax≤b}, the distance to the nearest optimal solution to the corresponding integer program is at most the dimension of the problem multiplied by the largest subdeterminant of the integral matrixA. Using this, we strengthen several integer programming ‘proximity’ results of Blair and Jeroslow; Graver; and Wolsey. We also show that the Chvátal rank of a polyhedron {x: Ax≤b} can be bounded above by a function of the matrixA, independent of the vectorb, a result which, as Blair observed, is equivalent to Blair and Jeroslow's theorem that ‘each integer programming value function is a Gomory function.’
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01582230
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of phase angle on the resolution of two coherently illuminated points (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 179-180 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620009
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  • 4
    Electronic Resource
    Electronic Resource
    A mechanism for alkaline cell leakage (1978)
    Springer
    Journal of applied electrochemistry 8 (1978), S. 253-263 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A form of alkaline creepage, other than that governed by electrocapillary phenomena, has been studied on partially immersed negatively polarized electrodes. This extra-creepage is believed to result from concentration gradients generated in the thin spreading film above the intrinsic liquid meniscus by the electrochemical reduction of oxygen and/or water. Consequent transport of water into the spreading film allows it to expand and advance further along the electrode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616428
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  • 5
    Electronic Resource
    Electronic Resource
    Phosphoric acid solutions. I: Molecular association in a 57.8 molal aqueous solution (1985)
    Springer
    Journal of solution chemistry 14 (1985), S. 41-48 
    Details
    ISSN: 1572-8927
    Keywords: Solute association ; ring dimers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A 57.8 molal solution of orthophosphoric acid (85% w/w) has been studied by the wide angle X-ray scattering method. Both the ARDF and the intensity curve are consistent with a hydrogen-bonded ring structure for the dimeric (H3PO4)2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646729
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  • 6
    Electronic Resource
    Electronic Resource
    Two-dimensional choked transonic flow (1988)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 39 (1988), S. 1-12 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es wird die schallnahe Sperrströmung um einen zweidimensionalen Flügel in einem weiten Windkanal analysiert. Asymptotische Reihenentwicklungen werden in der transsonischen Ähnlich-KeitsvariablenK T im inneren Bereich in der Nähe des Körpers und im äußeren Bereich nahe der Wandung konstruiert und verglichen. Die innere Reihenentwicklung besteht aus freier Schallströmung und einem Korrektionsglied. Die äußere Reihenentwicklung steht für das Zusammentreffen der Schallinie und der Grenzcharacteristik an der Wandung. Es werden die Größe des Korrektionsgliedes zur freien Schallströmung am Körper, als auch die Abhängigkeit der Machschen Zahl der freien Strömung von der Höhe des Windkanals bestimmt. Ein Randwertproblem wird formuliert um die Korrektur zur freien Schallströmung zu bestimmen.
    Notes: Summary Choked transonic flow about a thin two-dimensional airfoil in a wide wind tunnel is analyzed. Asymptotic expansions are constructed in terms of the transonic similarity variableK T as KT→0 (and the tunnel height→∞), in an inner region, “near” the body, and in an outer region, near the walls, and are matched. The inner expansion consists of sonic free flow plus a correction. The outer expansion accounts for the meeting of the sonic line and the limit characteristic at the wall. The magnitude of the correction to sonic free flight at the body as well as the dependence of the choking Mach number on the wind tunnel height are determined. A boundary value problem is formulated to determine the correction to the free flight sonic flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945718
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of water sorption on the dynamic modulus of elasticity of desiccated concrete materials (1976)
    Springer
    Materials and structures 9 (1976), S. 407-410 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Résumé On décrit ici l’effet des sorptions d’eau sur le module d’élasticité dynamique du béton, du mortier et de la pâte de ciment. Les résultats indiquent que le module dynamique décroît en désorption et reprend une partie de sa valeur initiale lors d’une sorption subséquente. On attribue la baisse de valeur du module au cours du premier séchage à certains changements irréversibles de la structure de la pâte de ciment durcie et au retrait la microfissuration produite. L’action d’humidification/séchage cyclique est cause de la diminution ultérieure du module dynamique; cette réduction est plus prononcée dans les séries de pâtes où la propagation des microfissures est plus susceptible de se produire. Le module dynamique est moindre que le module statique dans les éprouvettes séchées. Cependant, d’après les articles parus, l’inverse serait vrai pour les éprouvettes humides. Le module d’élasticité dynamique du béton est une fonction de son état hygrique et toute étude de la résistance et de la déformation du béton devrait tenir compte des variations concomittantes du module. Enfin, des variations du module dynamique peuvent servir d’évaluation qualitative de la microfissuration qui exerce aussi une grande influence sur la résistance et la déformation du béton.
    Notes: Abstract The effects of desorption and water sorption on the dynamic modulus of concrete, mortars and hardened Portland cement paste are investigated. Desiccation of the latter results in a significant reduction in the dynamic modulus. Cyclic drying and wetting of the concrete system further decreases the modulus value. Shrinkage induced microcracking is proposed as the major mechanism of the modulus variation. It is concluded that the first drying of the concrete system results in some irreversible changes in the structure of the hardened cement paste.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02473775
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  • 8
    Electronic Resource
    Electronic Resource
    The synthesis of a peptide having the structure attributed to a sound habituating material (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 754-756 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A peptide isolated from rats habituated to a sound stimulus has been given the structure Glu-Ala-Gly-Tyr-Ser-Lys-OH. A synthesis of this compound afforded a product that different from the natural material on the basis of chromatographic and physiological comparisons. The proposed sequence must therefore be in error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01938442
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  • 9
    Electronic Resource
    Electronic Resource
    A unified theory of atomic and nuclear shell structure (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 419-421 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary By stipulating that like-fermions adjacent in space must be singlet paired, geometric considerations alone produce closed electron shells at the 6 noble gases and, similarly, closed nucleon shells and subshells isomorphic with those of the harmonic oscillator used in nuclear theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935897
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  • 10
    Electronic Resource
    Electronic Resource
    Metabolism of norethynodrel in thrombophlebitic-thromboembolic subjects (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 416-417 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Der Metabolismus von Norethyndrol, der progestiven Komponente verschiedener derzeitig verwendeter oraler Kontraceptiva, wurde bei frauen mit einer thrombophlebetischen-thromboembolischen Krankengeschichte sowei bei normalen gesunden Frauen einer Kontrollgruppe untersucht. Der Norethyndrolmetabolismus beider Gruppen zeigte keine wesentlichen Unterschiede.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02026349
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