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  • 1990-1994  (28)
  • 1985-1989  (27)
  • 1970-1974
  • 1960-1964  (3)
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  • 1993  (28)
  • 1986  (27)
  • 1962  (3)
  • 1
    Digitale Medien
    Digitale Medien
    A convergent lattice approximation for nonlinear electromagnetic fields in four dimensions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 3327-3342 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: A discrete version of the quaternionic Cauchy–Riemann equation ∂A=F, where F is Gauss–Poisson white noise, is discussed. On the lattice δZ4 random variables Fδ(δn) and Aδ(δn) are constructed which approximate the corresponding random fields F and A, respectively, in the limit δ→0. In the Gaussian case the random variables Aδ(δn) can be interpreted as the lattice approximation of the free electromagnetic Euclidean potential field whereas in the non-Gaussian case one obtains an approximation of nonlinear interacting electromagnetic quantum fields. Convergence to the continuum limit is proven.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.530079
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  • 2
    Digitale Medien
    Digitale Medien
    Chain statistics of poly(diacetylenes) in solution (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 399-405 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00156a029
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  • 3
    Digitale Medien
    Digitale Medien
    Comment on "Conformation of polydiacetylene macromolecules in solution: Field induced birefringence and rotational diffusion constant'' (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1057-1058 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.450599
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  • 4
    Digitale Medien
    Digitale Medien
    Proposed Experimental Investigation of Uncertainty Relations by Measuring the Velocity Dispersion of Localized Neutrons (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 480 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb12476.x
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  • 5
    Digitale Medien
    Digitale Medien
    Alignment and application of the conical shadowgraph flow visualization technique (1986)
    Springer
    Experiments in fluids 4 (1986), S. 93-96 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract An optical bench study has been carried out to assess the effects of both beam alignment and nonconical disturbances in the application of conical shadowgraphy for flow visualization. Conical and quasiconical plastic test models were immersed in a refractive index matching fluid and then examined by shadowgraphy with a conical light beam. The results show that problems of interpretation may arise due to both axial and transverse beam misalignment. Among these difficulties, axial misalignment with positive vertex displacement is the least serious. Also, the effect of a particular nonconical disturbance field was found to introduce fewer difficulties of interpretation than that of beam misalignment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00266565
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  • 6
    Digitale Medien
    Digitale Medien
    Experimental investigations on two-phase flow past a sphere using digital Particle-Image-Velocimetry (1993)
    Springer
    Experiments in fluids 14 (1993), S. 296-304 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Digital Particle-Image-Velocimetry was applied to investigate particle trajectories in a gas flow past a sphere. The particle displacement was determined by autocorrelation analysis of image sections. To enhance the signal/noise ratio a synthetic image with idealized particle pictures was generated from the real image. The autocorrelation function (ACF) was calculated using the Fast Hartley Transformation (FHT). The desired secondary maximum of this function was detected by an algorithm with subpixel resolution. A data validation step testing the plausibility of the velocity vectors completes the image analysis. Particle trajectories are traced with help of the particles' velocity vectors. The particle deposition on a sphere can be deduced from the course of these trajectories.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00189487
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  • 7
    Digitale Medien
    Digitale Medien
    Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4 (1993)
    Springer
    Physics and chemistry of minerals 20 (1993), S. 27-32 
    Details
    ISSN: 1432-2021
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Abstract Infrared and Raman spectra of the basic copper salts malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4, as well as of deuterated and 13C substituted samples are presented and discussed in terms of group theory and the hydrogen bonds present. The main results are that (i) the hydrogen donor strengths of the OH− ions are strongly increased due to the very great synergetic effect of the copper ions, (ii) the acceptor strengths of the H-bond acceptor groups (SO4 2-, CO3 2-, and OH− ions) are significantly modified by the linkage and coordination of the acceptor atoms — this complicates true assignment of the OH bands observed to the two and six different OH− ions present in malachite and brochantite, respectively -, and (iii) the Cu — O stretching modes at 430–590 cm−1 and 420–520 cm−1 for malachite and brochantite, respectively, exhibit strong, partially covalent Cu — O bonding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00202247
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  • 8
    Digitale Medien
    Digitale Medien
    Laborversuche über Auswirkungen staubförmiger Kalkdünger auf die Kahlrückige Waldameise,Formica polyctena Först. (Hym., Formicidae) (1986)
    Springer
    Journal of pest science 59 (1986), S. 29-34 
    Details
    ISSN: 1612-4766
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung 1984 und 1985 wurden in Laborversuchen bei insgesamt 24 Kleinpopulationen (je 2000 ♀♀ u. 2 ♂♂) vonFormica polyctena die Auswirkungen handelsüblicher staubförmiger Kalkdünger auf Mortalität, Anzahl des Nachwuchses und Beuteeintrag untersucht. Bei Bestäuben der Versuchsvölker und ihres Lebensraumes wurden in allen Fällen Beeinträchtigungen sämtlicher untersuchtet Parameter festgestellt. Dabei waren deutliche Unterschiede im Ausmaß der Schädigung je nach Feinkörnigkeit der verwendeten Mittel zu beobachten. Der 2. Versuch (1985) zeigte, daß die chemische Zusammensetzung der Düngestäube keine entscheidende Rolle spielte. Bei ausschließlich oraler Applikation der Mittel wurden keine Unterschiede zu unbehandelten Kontrollvölkern festgestellt.
    Notizen: Abstract Calcium fertilizers as a dust were tested under laboratory conditions on their effects on small populations (2000 ♀♀, 2 ♂♂) of the Red Hillbuilding Wood AntFormica polyctena. Mixed into the food, the ants didn't show any reactions; however dusted with Calcium, daily mortality increased up to 10 times compared to non treated populations. Furthermore, reproduction and foraging activity were diminished. Additional experiments using one brand of fertilizer but different particle sizes showed that the finer the dust, the more detrimental is Calcium fertilizer to laboratory populations ofF. polyctena.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01908770
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  • 9
    Digitale Medien
    Digitale Medien
    Structure identification of natural rhamnolipid mixtures by fast atom bombardment tandem mass spectrometry (1993)
    Springer
    Glycoconjugate journal 10 (1993), S. 219-226 
    Details
    ISSN: 1573-4986
    Schlagwort(e): fast atom bombardment ; tandem mass spectrometry ; rhamnolipids ; Pseudomonas sp
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Two rhamnobiose-lipid preparations have been studied by fast atom bombardment (FAB) tandem mass spectrometry. The principal rhanobiose-lipids contain the β-hydroxydecanoyl-β-hydroxydecanoate Rha-Rha-C10-C10 and the β-hydroxytetradecanoyl-β-hydroxytetradecanoate Rha-Rha-C14-C14. Both preparations contain minor components which are heterogenous in β-hydroxy fatty acid composition. FAB ionization of rhamnobiose-lipids in the presence of Na+ shows the formation of both [M + Na]+, [M + 2Na - H]+, [M + 3Na - 2H]+ and [M - H]− ions. Tandem mass spectrometry of the [M + 2Na - H]+ and [M - H]− ions give information about the sequence of the building blocks. Particularly, heterogeneity in β-hydroxy fatty acid composition is determined for the principal components and all the minor components present in the preparations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00702203
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  • 10
    Digitale Medien
    Digitale Medien
    Instanton induced green functions in the superfield formalism (1986)
    Springer
    The European physical journal 30 (1986), S. 161-174 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We discuss in detail the supersymmetric instanton calculus of NSVZ and extend it to chiral matter fields in the, adjoint representation. The constant Green functions induced by the instanton of supersymmetricSU (2) gauge theories are calculated systematically for the cases with and without scalar vev's bigger than the scale of the gauge theory and for nonvanishing small masses of chiral fields. Oneinstanton contributions to the Green functions containing four fields without large vevs would disturb clustering; but they are argued to vanish; two-instanton effects then lead to a pattern which quantitatively agrees with factorization and the anomaly relation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01560691
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