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  • 1975-1979  (4)
  • 1950-1954
  • Chemical Engineering  (2)
  • Engineering  (1)
  • Hemoglobin, isomer shifts of Fe57 in ∼  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Calculated electron densities and experimental isomer shifts of Fe57 in the deoxy- and CO-compounds of myoglobin and hemoglobin (1975)
    Springer
    Theoretical chemistry accounts 38 (1975), S. 65-69 
    Details
    ISSN: 1432-2234
    Keywords: Myoglobin, isomer shifts of Fe57 in ∼ ; Hemoglobin, isomer shifts of Fe57 in ∼
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Relativistic calculations of various electronic configurations of the iron atom were used in conjunction with Hückel-type self consistent field molecular orbital calculations for CO-myoglobin and CO-hemoglobin (mbCO, hbCO) and with limited configuration interaction calculations for deoxymyoglobin and deoxy-hemoglobin (mb, hb) to determine electron densities at the iron nucleus, ϱ(0). The calculations included all effects of overlap of iron core and next nearest neighbour (ligand) orbitals, and the effect of potential distortion of iron core orbitals due to molecular configurations 3d m4s n. From the calculated electron densities we found that the change in the experimental Mössbauer isomer shift, Δδ =δmbCO, mbCO −δmb,hb, was mainly due to changes in the so-called overlap distortion of iron cores orbitals. The considerably higher electron density ϱ(0) in mbCO, hbCO than in mb, hb corresponds to the stronger interaction between iron and ligands in mbCO, hbCO compared to mb, hb. From the calculated values for ϱ(0) and the experimental isomer shifts we derived an isomer shift calibration constant, α = Δδ/Δϱ(0), of the value −0.242 ± 0.039a 0 3 mm sec−1, which agrees reasonably well with the work of other investigators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046557
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  • 2
    Electronic Resource
    Electronic Resource
    Interpolative versus iterative solution schemes for tresca yield condition in elastic-plastic finite element analysis (1978)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 12 (1978), S. 765-777 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620120503
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Compatible glassy polyblends based upon poly(2,6-dimethyl-1,4-phenylene oxide): Tensile modulus studies (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 519-524 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 mechanical behavior of compatible glassy polyblends based upon poly(2.6-dimethyl- 1,4-phe nylene oxide) (PPO) was investigated. In particular, the influence of composition, molecular weight, and molecular weight distribution upon the tensile modulus of the blend was assessed. Various possible correlations between the experimentally determined moduli and theory are considered. Included are correlations with density, packing density, composite theory, and lattice fluid theory. The modeling of the properties of mixtures via Simplex lattice design is also presented. Finally, attention is given to the development of compatibility criteria based upon tensile modulus and density measurements.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760190710
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  • 4
    Electronic Resource
    Electronic Resource
    Curing and heat transfer in polyurethane reaction moldingPresented in part at the AiChE Annual Meeting, Chicago, 1976. (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 382-387 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Temperature measurements were made on the adiabatic polymerization of three urethane systems; two casting formulations, one thermoplastic and the other thermosetting, and a commercial reaction injection molding (RIM) formulation with a 10 second gel time. The data were found to fit a simple nth order overall kinetic expression. These kinetic and heat of reaction results were used to model heat transfer in a 3.8 cm diameter cylinder with an isothermal wall. Experimental temperature profiles for the two casting urethanes were in good agreement with predictions. The kinetic data on the RIM material was used to model temperature profiles1 in 3 and 6 mm thick plaque molds. Experimental measurements of temperature near the mold center agreed with the model. Temperatures measured near the wall were higher due to failure of the isothermal wall assumption.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180509
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    Paper (German National Licenses)
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