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  • 1
    Electronic Resource
    Electronic Resource
    DECOMPOSITION OF MULTICOMPONENT SEISMIC DATA INTO PRIMARY P- AND S-WAVE RESPONSES (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 38 (1990), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Inversion of multicomponent seismic data can be subdivided in three main processes: (1) Surface-related preprocessing (decomposition of the multicomponent data into ‘primary’ P-and S-wave responses). (2) Prestack migration of the primary P- and S-wave responses, yielding the (angle-dependent) P-P, P-S, S-P and S-S reflectivity of the subsurface. (3) Target-related post-processing (transformation of the reflectivity into the rock and pore parameters in the target). This paper deals with the theoretical aspects of surface-related preprocessing.In a multicomponent seismic data set the P- and S-wave responses of the subsurface are distorted by two main causes: (1) The seismic vibrators always radiate a mixture of P- and S-waves into the subsurface. Similarly, the geophones always measure a mixture of P- and S-waves. (2) The free surface reflects any upgoing wave fully back into the subsurface. This gives rise to strong multiple reflections, including conversions.Therefore, surface-related preprocessing consists of two steps: (1)Decomposition of the multicomponent data (pseudo P- and S-wave responses) into true P- and S-wave responses. In practice this procedure involves (a) decomposition per common shot record of the particle velocity vector into scalar upgoing P- and S-waves, followed by (b) decomposition per common receiver record of the traction vector into scalar downgoing P- and S-waves. (2) Elimination of the surface-related multiple reflections and conversions. In this procedure the free surface is replaced by a reflection-free surface. The effect is that we obtain ‘primary’ P-and S-wave responses, that contain internal multiples only.An interesting aspect of the procedure is that no knowledge of the subsurface is required. In fact, the subsurface may have any degree of complexity. Both the decomposition step and the multiple elimination step are fully determined by the medium parameters at the free surface only. After surface-related preprocessing, the scalar P- and S-wave responses can be further processed independently by existing scalar algorithms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1990.tb01867.x
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Kinetik der Reaktion zwischen 1,3-Dichlorpropen und AmmoniakDr.-Ing. Karl Smeykal zum 65. Geburtstage gewidmet (1965)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 29 (1965), S. 113-122 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3-Dichlorpropen reagiert mit Ammoniak in wäßrig-alkoholischer Lösung unter Bildung des primären, sekundären und tertiären Chlorpropenylamins sowie des quaternären Ammoniumsalzes. Die mengenmäßige Zusammensetzung hängt vom Molverhältnis 1,3-Dichlorpropen/Ammoniak ab. Kinetische Untersuchungen bei 50°C ergaben, daß alle 4 Teilreaktionen der Reaktionsfolge nach Zeitgesetzen 2. Ordnung verlaufen. Die Geschwindigkeitskonstanten wurden durch ein numerisches Iterationsverfahren ermittelt; sie hängen ab von der Chlorionenkonzentration und der Konzentration der basischen Komponenten des Systems. Ammoniak reagiert mit Dichlorpropen etwa 10mal langsamer als die Chlorpropenylamine. Die Ergebnisse sprechen für einen SN2-Mechanismus.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19650290301
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  • 3
    Electronic Resource
    Electronic Resource
    Ueber den Zucker der Schneebeeren [Symphoricarpus racemosa (Michaux)] (1885)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 230 (1885), S. 50-55 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18852300104
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  • 4
    Electronic Resource
    Electronic Resource
    Ueber einige Reactionen des Saccharins (1885)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 18 (1885), S. 1333-1336 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.188501801283
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  • 5
    Electronic Resource
    Electronic Resource
    Berechnung gekoppelter molekularer Platzwechselprozesse mit Hilfe eines Hybridrechners (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 151-156 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Flow and relaxation in condensed matter, mainly in polymer systems are realized by molecular dislocations. The loosening of the structure at the second order transition point causes the place exchange processes in flow direction to be more easy. The few possibilities for rearrangement at the beginning of the softening allow noticeable deformations only if the exchange processes are cooperative. These processes are described by systems of differential equations, which can be solved by means of an analogous computer.
    Notes: Fließen und Relaxation in kondensierten Phasen, z. B. in erweichenden polymeren Systemen, beruhen auf molekularen Umlagerungen. Die am Glaspunkt beginnende Auflockerung der Struktur erleichtert die Platzwechselvorgänge in Fließrichtung. Die bei Beginnen der Erweichung bestehenden wenigen molekularen Umlagerungsmöglichkeiten erlauben nur dann merkliche Deformationen, wenn die Platzwechsel miteinander gekoppelt sind. Diese Prozesse werden durch Systeme gekoppelter linearer Differentialgleichungen beschrieben, die mit einem Hybridrechner gelöst und graphisch ausgewertet werden.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300305
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  • 6
    Electronic Resource
    Electronic Resource
    Gummielastische Verformung als Platzwechselvorgang (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 606-612 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The high elastic deformation of rubber is described by means of coupled molecular displacements in the direction of external stress. It appears a superposition of an elastic potential A caused by shearing forces and an intermolecular potential U given by chemical bonding forces. This leads to a disturbance of the thermodynamic equilibrium. As the molecular displacements are coupled we have to solve a system of eqations. With a function of the type A = C3σ + C4σ2 (σ-stress) the experimentally found dependence between stress and strain is best described. The most noteworthy result of the theory is the explanation of the saturation of deformation with growing stress and a S-like curvature for low stresses in the stress-strain relation.
    Notes: Die kautschukelastische Verformung wird auf der Basis gekoppelter molekularer Umlagerungen in Richtung der äußeren Spannung betrachtet. Es tritt eine Überlagerung eines elastischen Potentials A, das durch Scherkräfte verursacht wird, und eines intermolekularen Potentials U, das durch die chemischen Bindungskräfte gegeben ist, auf. Dies führt zu einer Störung des thermodynamischen Gleichgewichtes. Da die molekularen Umlagerungen gekoppelt sind, muß ein System von Gleichungen gelöst werden. Mit einer Funktion der Art A = C3σ + C4σ2 (σ-Spannung) wird der experimentell gefundene Zusammenhang zwischen Spannung und Dehnung am besten wiedergegeben. Das bemerkenswerteste Ergebnis der Theorie ist die Deutung der Sättigung der Deformation bei wachsender Spannung und eine S-förmige Krümmung der Spannungsdehnungskurve im Anfangsbereich.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010301002
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  • 7
    Electronic Resource
    Electronic Resource
    Ueber Malonsäuremethylanilid (1898)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 31 (1898), S. 1826-1828 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.189803102102
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