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  • 1
    Digitale Medien
    Digitale Medien
    Kinematics of a rolling tire and its application to tire performance (1959)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 2 (1959), S. 174-180 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A geometrical analysis is given of the tread motions occurring in the contact length of a rolling tire. Both the case of a free rolling wheel and that of a wheel under torque are discussed. We have derived expressions and curves for the relative slip and compressions which occur at the contact length for the two conditions. It is found that two important structural features control the nature of tread motions. These are the torsional rigidity of the sidewall and the compressibility of the tread. In addition, the implication of the analysis in tire design and performance are discussed.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1959.070020507
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of a vulcanizate of the halogenated butyl rubber, MD-551. I. Gum properties (1961)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 5 (1961), S. 322-330 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: We have found that vulcanizates of MD-551 and butyl rubber at identical crosslink densities have similar properties in low deformation tests at room temperatures. At high extension, the butyl has considerably higher tensile strength which we have associated with crystallization. The MD-551, on the other hand, shows heat stability far superior to that of butyl. It is postulated here that both these differences follow from the nature of the crosslinks in each polymer. The crosslinks in the MD-551 are thought to be both mechanically and chemically more stable than those in butyl. This prevents crystallization on stretching and enhances high temperature stability. Thus far, we have been concerned only with the gum properties of the MD-551. From our previous work, we would expect carbon black to improve the tensile properties of MD-551. Furture work will therefore be concerned with properties of reinforced MD-551. In addition, studies will be made in order to learn more about the crosslinks and how they affect vulcanizate performance.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1961.070051512
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  • 3
    Digitale Medien
    Digitale Medien
    Response of elastomers to any forcing function (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 4 (1960), S. 269-276 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The dynamic behavior of elastomers is usually studied in terms of a sinusoidal system. The theoretical and practical limitations of such analysis are discussed. A method which permits calculation of dynamic properties over a wide range of frequencies and forcing functions is described. The theoretical justification and limitations as well as the experimental setup are presented. Using SBR, natural rubber, and butyl, examples of the dynamic responses for various forcing functions are shown. The analogue computer is used to show properties of the above described rubbers which are useful from both the theoretical and application-oriented viewpoints.
    Zusätzliches Material: 23 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1960.070041204
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  • 4
    Digitale Medien
    Digitale Medien
    Computer extended series for a thermally driven gas centrifuge (1986)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 6 (1986), S. 395-401 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Computer Extended Series ; Gas Centrifuge Theory ; MACSYMA ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: Linearized, multidimensional, thermally driven flow in a gas centrifuge can be approximately described in regions away from the ends by Onsager's homogeneous pancake equation.1 Upon reformulation of the general problem, we find a new, simple and rigorous closed form, analytical solution by assuming a special separable solution and replacing the usual Ekman end cap boundary conditions with idealized impermeable, free slip boundary conditions. Then the flow may be described by an ordinary differential equation with solutions in terms of simple, classical functions. By identifying a small parameter, say ∊, defining the semi-long bowl approximation, and assuming a power series expansion in ∊, a sequence of asymptotic approximations to the master potential is obtained. Not surprisingly, the leading order term involves the well known ‘long bowl’ solution. Using the so-called ‘solving’ property of the 1-D pancake Green's function,2 we determine the next higher order solution. This recursive process is carried out on the computer to find all the terms up to O(∊4).Consequently, the solution of some complex rotating, viscous, heat conducting flow problems that normally require large mainframe computers can be better understood.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650060607
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  • 5
    Digitale Medien
    Digitale Medien
    Numerical calculation of transitional boundary layers (1982)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 2 (1982), S. 1-23 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Transition ; Boundary Layers ; Models of Turbulence ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: A computational procedure for compressible axisymmetric boundary layers, on bodies of revolution, in transition from laminar to turbulent flow, is introduced. The procedure is an extension of a former method, due to Patankar and Spalding.The flow field is computed by solution of four simultaneous equations for the momentum, the thermal energy, the turbulence energy amplitude and the turbulent scale.The results show good agreement with existing theoretical and experimental data.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650020102
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  • 6
    Digitale Medien
    Digitale Medien
    Finite element analysis of flow in a gas-filled rotating annulusBased on work performed at Oak Ridge Gaseous Diffusion Plant, operated by Martin Marietta Energy Systems, Inc, for the U.S. Department of Energy under U.S. Government contract DE-AC05-840R21400. (1987)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 7 (1987), S. 215-231 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Finite Element Method ; Rotating Fluid Mechanics ; Slip Flow ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: Linearized multidimensional flow in a gas centrifuge can be described away from the ends by Onsager's pancake equation. However a rotating annulus results in a slightly different set of boundary conditions from the usual symmetry at the axis of rotation. The problem on an annulus becomes ill-posed and requires some special attention. Herein we treat axially linear inner and outer rotor temperature distributions and velocity slip. An existence condition for a class of non-trivial, one-dimensional solutions is given. New exact solutions in the infinite bowl approximation have been derived containing terms that are important at finite gap width and non-vanishing velocity slip. The usual one-dimensional, axially symmetric solution is obtained as a limit. Our previously reported finite element algorithm has been extended to treat this new class of problems. Effects of gap width, temperature and slip conditions are illustrated. Lastly, we report on the compressible, finite length, circular Couette flow for the first time.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650070303
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  • 7
    Digitale Medien
    Digitale Medien
    Computer-extended series for a source/sink driven gas centrifugeBased on work performed at Oak Ridge Gaseous Diffusion Plant, operated by Martin Marietta Energy Systems, Inc, for the U.S. Department of Energy under U.S. Government contract DE-AC05-840R21400. (1987)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 7 (1987), S. 233-246 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Computer Extended Series ; Rotating Fluid Mechanics ; MACSYMA ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: We have reformulated the general problem of internal flow in a modern, high speed gas centrifuge with sources and sinks in such a way as to obtain new, simple, rigorous closed form analytical solutions. Both symmetric and antisymmetric drives lead us to an ordinary differential equation in place of the usual inhomogeneous Onsager partial differential equation. Owing to the difficulties of exactly solving this sixth order, inhomogeneous, variable coefficient ordinary differential equation we appeal to the power of perturbation theory and techniques. Two extreme parameter regimes are identified, the so-called semi-long bowl approximation and a new short bowl approximation. Only the former class of problems is treated here. The long bowl solution for axial drive is the correct leading order term, just as for pure thermal drive. New O(1) results are derived for radial, drag and heat drives in two dimensions. Then regular asymptotic, even ordered power series expansions for the flow field are carried out on the computer to O(ε4) using MACSYMA. These approximations are valid for values of ε near unity. In the spirit of Van Dyke, one can carry out this expansion process, in theory, to apparently arbitrary order for arbitrary but finite decay length ratio. Curiously, the flows induced by axial and radial forces are proportional for asymptotically large source scale heights, x*. Corresponding isotope separation integral parameters will be given in a companion paper.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650070304
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  • 8
    Digitale Medien
    Digitale Medien
    Kinetics of the polymerization of ethylene with a ziegler-natta catalyst. I. Principal kinetic features (1965)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 83 (1965), S. 80-99 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Kinetik der Äthylenpolymerisation in einer speziellen Apparatur wurde untersucht. Eine stabile Katalysator-Kombination (Al(C2H5)2Cl/γ-TiCl3), die während der Polymerisation keine Änderung erfährt, wurde angewendet. Es werden Bedingungen beschrieben, unter denen die Reaktion (a) unabhängig, (b) abhängig von der Monomer-Übertragungsgeschwindigkeit ist. Nach einer Anlaufperiode verläuft die Polymerisation mit konstanter Geschwindigkeit, bis das Reaktionsgemisch nicht mehr ausreichend gerührt werden kann. Der Katalysator wird weder okkludiert noch desaktiviert, so daß unbegrenzte Polymermengen mit einer bestimmten Katalysatorkonzentration hergestellt werden können. Sofern die Reaktion nicht durch den Monomer-Transport bestimmt wird, ist die Geschwindigkeit linear von Monomer- und TiCl3-Konzentration abhängig und unabhängig von der Al(C2H5)2Cl-Konzentration. Wasserstoff setzt bei konstantem Äthylendruck die Polymerisationsgeschwindigkeit herab.
    Notizen: The kinetics of the polymerization of ethylene was studied in an apparatus which is described. A stable catalyst combination [Al(C2H5)2Cl/γ-TiCl3] which does not change during the polymerization was used. Conditions are defined under which the reaction is (a) independent of mass transfer rate (b) controlled by mass transfer. After an initial period, the polymerization proceeds at constant rate until the slurry is too thick to stir adequately. The catalyst is neither occluded nor deactivated so that unlimited quantities of polymer can be made from a given amount. When the reaction is not controlled by mass transfer, the rate is linearly dependent on monomer and TiCl3 concentration and is independent of Al(C2H5)2Cl. Hydrogen reduces the rate of the polymerization at a constant partial pressure of ethylene.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1965.020830107
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  • 9
    Digitale Medien
    Digitale Medien
    13C NMR spectra of some N-aryl substituted sulphur-nitrogen compounds (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 170-172 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The 13C n.m.r. spectra of four classes of N-aryl sulphur-nitrogen compounds are discussed. The para carbon shieldings of the N-phenyl derivatives reflect the substituents effects of the various nitrogen groups. These show large differences for the four classes of compounds due to differences in the electronic structure of the sulphur-nitrogen bond.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270080315
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  • 10
    Digitale Medien
    Digitale Medien
    A note regarding thermodynamics of crystalline copolymers (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 62 (1962), S. S145 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1962.1206217457
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