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  • 1
    Electronic Resource
    Electronic Resource
    Curing mechanism and thermal properties of epoxy-imidazole systems (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 99-104 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00191a020
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  • 2
    Electronic Resource
    Electronic Resource
    Upper and lower bounds for the partition function of lattice models
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 157 (1989), S. 983-999 
    Details
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4371(89)90076-9
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  • 3
    Electronic Resource
    Electronic Resource
    Human-induced tachycardia in wild and tame mallard (Anas platyrhynchos)
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part A: Physiology 92 (1989), S. 125-128 
    Details
    ISSN: 0300-9629
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0300-9629(89)90753-6
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  • 4
    Electronic Resource
    Electronic Resource
    In situ heart rate and activity of incubating Adélie penguins (Pygoscelis adeliae) (1989)
    Springer
    Polar biology 9 (1989), S. 365-370 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Heart rates and activity were monitored over 24 h in unrestrained, incubating Adélie penguins (Pygoscelis adeliae) exposed to natural conditions in the colony. Heart rate (HR in bpm) increased linearly with wind speed (w; range 0–19 m/s): HR = 85.8+1.35 w, but was unrelated (P〉0.05) to temperature (-2.5°–6°C), humidity (37%–100%) cloud cover (0–8/8) and estimated solar radiation (0–12). Wind-induced heat loss was apparently compensated to a large degree by increased metabolic activity. Activity (A) measured as frequency of standing per hour, decreased linearly with temperature (t) and wind speed (w): A = 1.651−0.033w−0.090t. After correcting for meteorological influences, heart rate and bird activity showed no diurnal periodicity. When incubating, metabolism and activity of Adélie penguins appear to be mainly governed by climatic variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00442526
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  • 5
    Electronic Resource
    Electronic Resource
    On quantum statistical variational principles (1979)
    Springer
    The European physical journal 34 (1979), S. 117-122 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the equivalence between Feyman's and Bogolubov's variational principle, we discuss in the formalism of Hamiltonian quantum mechanics an improved upper bound for the free energy which has been given recently by Zeile using path integral methods. We show that Zeile's variational principle does not guarantee a thermodynamically consistent description.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01362785
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  • 6
    Electronic Resource
    Electronic Resource
    Asymptotically exact variational approach to the strong coupling Hubbard model (1976)
    Springer
    The European physical journal 25 (1976), S. 381-389 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this contribution we use a generalization of Bogoljubov's variational principle, in order to develop a molecular field theory of the Hubbard model, which becomes asymptotically exact in the strong coupling limit. For this purpose the Hamiltonian is rotated by a unitary two-particle transformation in a way which was previously introduced by Kapustin, before the variational principle is applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315254
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  • 7
    Electronic Resource
    Electronic Resource
    Strong-coupling properties of the neutral Hubbard model (1977)
    Springer
    The European physical journal 26 (1977), S. 177-185 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From a new variational approach to the Hubbard model, communicated previously [1], we derive the magnetic strong-coupling properties for the half filled band case of the Hubbard model in simple cubic lattices. The transition temperature from an AB-antiferromagnetic to a paramagnetic state, the sublattice magnetization and the localization of magnetic moments are investigated in detail. Near the strong coupling limit the results become asymptotically exact in a molecular field sense but they look reasonable even outside this asymptotic region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325270
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  • 8
    Electronic Resource
    Electronic Resource
    Thermogravimetrische Methode zur Untersuchung der Gleichgewichte Festkörper/Gas und Schmelze/Gas in korrosionschemisch wichtigen Sulfatsystemen (1968)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 837-844 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Thermogravimetric method for investigating the solid/gas and melt/gas equilibria in sulphate systems of corrosion-chemical importanceThe authors describe a micro-thermogravimetric method which permits the determination of the phase zones of sulphate systems as a function of temperature and of the SO3-partial pressure. At the Me2SO4—SO3 (Me = Na, K) system, the existence limits of the bi-variant melt and the mono-variant equilibria Me2SO4(solid)-melt and Me2SO4(solid)-Me2S2O7(solid) are determined. Water vapour is dissolved in the melt phases investigated because the existence limits of the latter are modified by the vapour.
    Notes: Es wird eine mikro-thermogravimetrische Methode beschrieben, welche gestattet, die Phasenfelder von Sulfatsystemen als Funktion der Temperatur und des SO3-Partialdrucks zu ermitteln. Am System Me2SO4—SO3 (Me = Na, K) werden die Existenzgrenzen der bivarianten Schmelze und die monovarianten Gleichgewichte Me 2SO4 (fest)-Schmelze und Me2SO4 (fest)-Me2S2O7 (fest) bestimmt. Wasserdampf löst sich in den untersuchten Schmelzphasen, denn ihre Existenzgrenzen werden durch ihn verändert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19680191002
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  • 9
    Electronic Resource
    Electronic Resource
    Genus-specific PCR for the differentiation of eggs or larvae from gastrointestinal nematodes of ruminants (1999)
    Springer
    Parasitology research 85 (1999), S. 895-898 
    Details
    ISSN: 1432-1955
    Keywords: Key words PCR ; Species differentiation ; Nematodes ; Ruminants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Using sequences of the ribosomal second internal transcribed spacer (ITS2), PCR primers were designed for the differentiation of the gastrointestinal nematode genera Ostertagia, Cooperia, Nematodirus, Haemonchus and Trichostrongylus. Single eggs or larvae from faeces could be differentiated without previous DNA extraction. Quantification of the PCR result proved to be difficult because the DNA content between eggs from fresh or 24-h-old faeces varied considerably.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004360050654
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of imidazole-cured epoxy-phenol resins (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 1557-1566 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The physical and chemical properties of the diglycidyl ether of bisphenol A (DGEBA) cured with different concentrations of bisphenol A (BPA) and 2-ethyl-4-methylimidazole (EMI-24) were examined using Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical and dielectric analyses, and solvent extraction studies. The effects of the phenol-epoxide and the secondary hydroxyl (R-OH)-epoxide reactions on the network formation process were analyzed using a recursive modeling technique to obtain expressions for the weight-averaged molecular weight, the weight fraction solubles, and the gel point as a function of the extent of cure and the epoxide-phenol reactant ratio. The sol fraction and the gel point predictions from recursive modeling studies of the network formation process agreed with the results obtained from the extraction studies. The results from the network modeling studies were also related to the thermal and rheological properties of the resin during cure.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420609
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