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  • 1990-1994  (28)
  • 1975-1979  (8)
  • 1960-1964  (2)
  • 1955-1959
  • 1930-1934  (3)
  • 1925-1929
  • 1993  (28)
  • 1977  (8)
  • 1961  (2)
  • 1934  (3)
  • 1
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530079
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189487
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202247
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  • 4
    Electronic Resource
    Electronic Resource
    Immunitätszüchtung bei Tabak (1934)
    Springer
    Naturwissenschaften 22 (1934), S. 557-559 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01495111
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  • 5
    Electronic Resource
    Electronic Resource
    Zeitschriftenschau (1961)
    Springer
    Journal of pest science 34 (1961), S. 125-128 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02005701
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  • 6
    Electronic Resource
    Electronic Resource
    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
    Keywords: fast atom bombardment ; tandem mass spectrometry ; rhamnolipids ; Pseudomonas sp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702203
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  • 7
    Electronic Resource
    Electronic Resource
    The complex Hα profile of the hypergiant HR 8752 during 1970–1992 (1993)
    Springer
    Space science reviews 66 (1993), S. 231-236 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The profiles of Hα observed during the 1970–1992 period in the binary hypergiant HR 8752 (G0 Ia) are presented. We distinguish five typical Hα profiles designated as A, B, C, D and E types according to the number of emission and absorption features. The profiles of Hα are complex and contain several emission and absorption components, with: −130 km/s in emission or absorption, −84 km/s in absorption, −49 km/s in emission and about +6 km/s in emission. All of them are rather stable in radial velocities except of the main absorption component in the P Cygni profile with −84 km/s. The frequency of appearance and the periods of duration of the occurrence of the components is discussed. The duration times range between about 3 to 10 months for various components. The red emission component E2 is particularly interesting. Possible explanations of its origin are discussed. A long-term acceleration of the absorption component in the P Cygni profile is found; it can be interpreted as monotonous acceleration of the stellar wind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771072
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  • 8
    Electronic Resource
    Electronic Resource
    89. Untersuchungen zum Einfluß elektrostatischer Effekte auf die Naßentstaubung (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1105-1105 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650991
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von nur im festen Zustand existenzfähigen 1:1-Verbindungen zwischen Antimon(III)-Halogeniden und 1,3,5-Trithiacyclohexan (s-Trithian) (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 437 (1977), S. 149-154 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Characterization of Weak Bonded Solid 1:1 Adducts Formed between Antimony(III) Halogenides and s-TrithianeCrystalline 1:1 addition compounds are formed on cooling hot solutions of antimony(III) halides and s-trithiane in benzene or toluene. Their preparation, physical properties and vibrational spectra are described.
    Notes: Aus den Gemischen heißer Lösungen von s-Trithian und Antimon(III)-Halogeniden in Benzol oder Toluol kristallisieren beim Erkalten 1:1-Additionsverbindungen. Ihre Darstellung, physikalischen Eigenschaften und Schwingungsspektren werden beschrieben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774370119
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  • 10
    Electronic Resource
    Electronic Resource
    Isomerieerscheinungen am Tris-trimethylsilyl-substituierten s-Trithian (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 437 (1977), S. 159-161 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isomerizations of Triple Substituted s-TrithianeTreatment of triple silyl-substituted s-trithiane with n-butyllithium results in the formation of lithium salts of carbenium ions. Their reactions with water or heavy water lead to isomers of 2,4,6-tris-(trimethylsilyl)-s-trithianes.
    Notes: Dreifach silyliertes s-Trithian wird mit überschüssigem n-Butyllithium umgesetzt. Die entstehenden Lithiumsalze von Carbanionen ergeben bei Zusatz von Wasser bzw. Deuteriumoxid Isomere des 2,4,6-Tris-(trimethylsilyl)-s-trithians.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774370121
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