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  • 1
    Electronic Resource
    Electronic Resource
    Calculation of the retention time of the ''air peak'' in gas chromatograms
    Amsterdam : Elsevier
    Journal of Chromatography A 34 (1968), S. 246-248 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(68)80043-3
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  • 2
    Electronic Resource
    Electronic Resource
    Preface
    Amsterdam : Elsevier
    Solid State Electronics 4 (1962), S. vii-viii 
    Details
    ISSN: 0038-1101
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1101(62)90064-3
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  • 3
    Electronic Resource
    Electronic Resource
    3D Strain measurement from gratings on both surfaces of sheet metal (2000)
    Springer
    Archive of applied mechanics 70 (2000), S. 443-452 
    Details
    ISSN: 1432-0681
    Keywords: Keywords Two-sided grating ; photogrammetry ; 3D surface ; 3D strain ; sheet metal forming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  The deformation of thick sheet metal is analyzed using 3D coordinates of cross-gratings on both sides of a specimen. The basic equations are presented for evaluating the 3D strain tensor from displacement functions. Provided the grating coordinates are measured in the undeformed and the deformed states, the difference of the coordinates yields displacement vectors. These are used to determine polynomial displacement functions, which approximate the displacement vectors in a least-squares sense. The condition of volume invariance at plastic deformation implies the strain in the direction of the thickness. The whole procedure is tested by a radial symmetric forming of a rectangular sheet metal into a half-tube, because it can be evaluated analytically, too. Finally, a real forming process of a plane circular sheet metal into a cup-like object is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004199900077
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  • 4
    Electronic Resource
    Electronic Resource
    The phase shift method applied to cross grating moire measurements
    Amsterdam : Elsevier
    Optics and Lasers in Engineering 7 (1986), S. 101-114 
    Details
    ISSN: 0143-8166
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics , Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0143-8166(86)90010-2
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Verzerrung der Spannung bei Hochspannungsprüfsätzen (1942)
    Springer
    Electrical engineering 36 (1942), S. 541-555 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Zusammenfassung Das neue Me\verfahren benutzt unmittelbar die Verzerrung der Spannung eines Generators für die Bestimmung der Ursachen dieser Verzerrung; es ergibt also das klarste, mögliche Bild. Das Verfahren ergibt, da\ die für die Verzerrung ma\gebende Generatorinduktivität genügend genau mit der Streuinduktivität Übereinstimmt, die mit den bekannten Verfahren bestimmt wird. Ferner zeigt sich, da\ das inverse Feld bei vielen Generatoren einen unerwartet gro\en Einflu\ ausübt. Durch einen Kunstgriff gelingt es allerdings, das inverse Feld nach Belieben teilweise oder völlig auszuschalten. Da die 3. Harmonische in der Spannung, die vom inversen Feld herrührt, in vielen Fällen der durch die Streuung hineingebrachten Oberschwingung entgegen wirkt, gelingt es sogar, die Gesamtverzerrung der Spannung auf Null zu bringen. Ob das unter allen Umständen möglich ist, mu\ durch weitere Untersuchungen geklärt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02078696
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  • 6
    Electronic Resource
    Electronic Resource
    Die numerische Behandlung eines Schrankenverfahrens mit Anwendung auf axialsymmetrisches Stauchen (1973)
    Springer
    Acta mechanica 17 (1973), S. 291-303 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary The compression of simple axisymmetric specimen is treated by means of the upper bound theorem. An iterative Ritz-method, proposed in this paper, yields better upper bound loads than comparable methods known in literature. Moreover, a good approximation of the instantaneous velocity field is derived. Using this field the non-stationary deformation is examined step by step. By choosing a proper system of functions for the velocity field the given method well applies to other forming processes.
    Notes: Zusammenfassung Das Stauchen einfacher axialsymmetrischer Proben wird mit Hilfe des Verfahrens von der oberen Schranke untersucht. Die angegebene numerische Methode, ein iteratives Ritz-Verfahren für mehrparametrige Ansatzfunktionen, liefert bessere Schranken für die Stauchkraft als vergleichbare Verfahren in der Literatur. Zudem erhält man eine gute Approximation des momentanen Geschwindigkeitsfeldes und kann damit den Verlauf der Umformung schrittweise verfolgen. Das angegebene Verfahren läßt sich durch Wahl geeigneter Ansatzfunktionen sinnvoll auf andere Umformprozesse anwenden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01183762
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  • 7
    Electronic Resource
    Electronic Resource
    Calculation of strain from an object grating on a reseau film (1992)
    Springer
    Experimental mechanics 32 (1992), S. 96-101 
    Details
    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 A correlation technique for the automatic calculation of grating coordinates in digital images is presented yielding displacements and strain on plane surfaces with an accuracy of 100 to 300 microstrain. It is shown that a large grating area can be investigated when the object grating is filmed by a reseau camera. Each segment of the negative can be digitized with a high-resolution CCD-camera resulting in a global resolution of about 6000*6000 pixels in the whole image. To improve the accuracy of the grating coordinates and to avoid segmentation errors at the overlapping edges, the distortion of the CCD-camera and of the digitizing setup is corrected by a two-dimensional polynomial function. This is derived from the distortion of a digitized image of a high-precision reference grating. The strain calculation considers large deformations as well as rigid-body rotation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324719
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  • 8
    Electronic Resource
    Electronic Resource
    Mikroverfahren zur quantitativen Analyse von Körperflüssig-keiten (1923)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 63 (1923), S. 72-80 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380371
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  • 9
    Electronic Resource
    Electronic Resource
    Methoden zur quantitativen Bestimmung des Ammoniaks in Körperflüssigkeiten (1926)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 69 (1926), S. 364-368 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01393784
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  • 10
    Electronic Resource
    Electronic Resource
    Strain tensor for large three-dimensional surface deformation of sheet metal from an object grating (1999)
    Springer
    Experimental mechanics 39 (1999), S. 30-35 
    Details
    ISSN: 1741-2765
    Keywords: Three-dimensional deformation ; sheet metal ; grating method ; deformation gradient ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Grating techniques are used to determine the three-dimensional deformation and the tangential strain of sheet metal. A grating is fixed on the surface and taken by stereo CCD cameras in different deformation states. By suitable line-following software, the grating coordinates in the images are determined with subpixel accuracy. Using photogrammetric methods, the three-dimensional coordinates are calculated from the image coordinates. The strain usually is determined by means of a deformation gradient, which is calculated from every deformed triangle. In this paper, the gradient is determined in the center of four neighboring meshes using a polynomial approximation of the displacement function in a reference position. The influence of the nontangential deformation is considered. By simulation, a flat sheet metal is deformed to a rotational symmetric surface. The difference of the known exact strain is compared with the numerically derived strain with respect to different grating pitches. The proposed method yields good results even in the case of large spatial deformation. It is applied to the deformation of a hatlike test specimen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02329298
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