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  • 1975-1979  (4)
  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computers and the humanities 12 (1978), S. 237-246 
    ISSN: 1572-8412
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Rock mechanics and rock engineering 3 (1971), S. 208-216 
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Description / Table of Contents: Zusammenfassung Das mechanische Verhalten von vorgebrochenen Gesteinsproben unter Druckbelastung Der vorliegende Aufsatz beschreibt die Ergebnisse von Druckversuchen, die an vorgebrochenen Gesteinsproben durchgeführt worden sind. Proben von Westerly Granit und Cedar City Tonalit wurden zunächst in steifen Kammern vorgebrochen und anschließend in Triaxialversuchen bis zu 7 kb Manteldruck belastet. Die Ergebnisse weisen interessante Charakteristiken auf, besonders die Beibehaltung erheblicher Festigkeitswerte bei verschiedensten Belastungszuständen sowie die Zunahme der größten Verformung. Die erhaltenen Daten werden mit Ergebnissen von Reibungsversuchen an Westerly Granit, die aus der Literatur bekannt sind, verglichen. Die weitgehende Übereinstimmung der größten Spannungswerte läßt darauf schließen, daß Reibung das mechanische Verhalten vorgebrochener Proben wesentlich beeinflußt.
    Abstract: Résumé Comportement mécanique en compression de la roche pré-fracturée Cet article décrit les procédés expérimentaux et les résultats obtenus à la suite d'une étude expérimentale sur des échantillons de roche fracturés à l'avance. Dans ces essais, des échantillons de granite W et de tonalité CC ont été brisés dans des appareils spéciaux et soumis ensuite à l'essai triaxial. Des pressions latérales jusqu'à 7 kbar ont été employées. Les échantillons de roche avaient été largement fragmentés pendant la fracturation initiale. Les résultats indiquent un certain nombre de particularités intéressantes, y compris le maintien significatif d'une aptitude à supporter des charges sous maintes conditions de contraintes, et une augmentation de la déformation maximale. On a fait une comparaison avec les résultats de frottement obtenus ailleurs pour le granite W. Le bon accord des contraintes maximales suggère l'importance du frottement dans le comportement mécanique des échantillons.
    Notes: Summary The Mechanical Response of Pre-Fractured Rock in Compression This paper describes experimental procedures and results obtained from an experimental study of pre-cracked rock specimens. In these experiments specimens of Westerly granite and Cedar City tonalite were broken in special fixtures and subsequently retested in a triaxial apparatus. Confining pressures up to 7 kb were employed. The rock specimens were well fragmented during the pre-cracking process. The results indicate a number of interesting features, including the significant retention of load-carrying ability under many stress conditions and an increase in maximum deformation. A comparison is made with frictional data determined elsewhere for Westerly granite; the close agreement in maximum stress suggests the importance of friction in the specimen mechanical behavior.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 12 (1972), S. 508-513 
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of dynamic loading on the stress-strain and failure characteristics of nugget sandstone was investigated at strain rates from 102 to 103 per second and confining pressures to 30 ksi. The apparatus developed for these experiments consists of a conventional split Hopkinson bar enclosed in a pressure vessel. The apparatus permitted determination and recording of all principal stresses and strains from the onset of loading to failure. A description of the experimental techniques used in obtaining data including the method of determining stress and strain, the method of reducing data, and use of various shaped projectiles to tailor the input-stress wave are reported together with experimental results for nugget sandstone. All rocks tested exhibited an increase in strength as the loading rate increased. The dynamic stress-strain curves were similar in shape to curves from quasi-static testing of the same material.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1972-11-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 5
    Publication Date: 1979-07-01
    Print ISSN: 0022-3670
    Electronic ISSN: 1520-0485
    Topics: Geosciences , Physics
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  • 6
    Publication Date: 2011-08-17
    Description: A language-independent proposal for environment parameters and basic functions for floating-point computation is presented. Basic functions are proposed to analyze, synthesize, and scale floating-point numbers. The model provides a small set of parameters and a small set of axioms along with sharp measures of roundoff error. The parameters and functions can be used to write portable and robust codes that deal intimately with the floating-point representation. Subject to underflow and overflow constraints, a number can be scaled by a power of the floating-point radix inexpensively and without loss of precision. A specific representation for FORTRAN is included.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: JPL Conf. on the Programming Environ. for Develop. of Numerical Software; p 11-14
    Format: text
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  • 7
    Publication Date: 1977-03-18
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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