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  • 1
    Digitale Medien
    Digitale Medien
    Nonstationary driven oscillations of a magnetic cavity (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3515-3530 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The problem of transition to the steady state of driven oscillations in a magnetic cavity in a cold resistive plasma is addressed. The foot point driving polarized in the inhomogeneous direction is considered, and it is assumed that the cavity length in the direction of the equilibrium magnetic field is much larger than the cavity width in the inhomogeneous direction. The latter assumption enables one to neglect the variation of the magnetic pressure in the inhomogeneous direction, which strongly simplifies the analysis. The explicit solution describing the nonstationary behavior of the magnetic pressure and the velocity is obtained. This solution is used to study the properties of the transition to the steady state of oscillation. The main conclusion is that, in general, there are two different characteristic transitional times. The first time is inversely proportional to the decrement of the global mode. It characterizes the transition to the steady state of the global motion, which is the coherent oscillation of the cavity in the inhomogeneous direction. The second time is the largest of the two times, the first transitional time and the phase-mixing time, which is proportional to the magnetic Reynolds number in 〈fraction SHAPE="CASE"〉13 power. It characterizes the transition to the steady state of the local motion, which is oscillations at the local Alfvén frequencies, and the saturation of the energy damping rate. An example from solar physics shows that, in applications, the second transitional time can be much larger than the first one. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1288150
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  • 2
    Digitale Medien
    Digitale Medien
    Structure of driven Alfvén waves with oblique magnetic field and dissipation (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 649-659 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The quasi-resonant behavior of linear Alfvén waves in one-dimensional magnetized weakly resistive plasmas with the slightly inclined equilibrium magnetic field is studied. The analysis concentrates on the behavior of the y-component of the velocity, v, which is the component perpendicular both to the inhomogeneity direction and to the equilibrium magnetic field, and the z-component of the velocity, w, which is the component along the inhomogeneity direction. It is shown that the behavior of v and w is described by the functions F(σ;Λ) and G(σ;Λ), where σ is the dimensionless distance along the inhomogeneity direction and the parameter Λ characterizes the relative importance of resistivity and the magnetic field inclination near the quasi-resonant position. The functions F(σ;Λ) and G(σ;Λ) are generalizations of the F and G functions introduced by Goossens, Ruderman, and Hollweg [Sol. Phys. 157, 75 (1995)] and coincide with them for Λ=0. The behavior of F(σ;Λ) and G(σ;Λ) is studied numerically for different values of Λ. It changes from monotonic to oscillatory when Λ is increased. It is shown that the connection formulas giving the jumps of w and the perturbation of the total pressure across the quasi-resonant layer and the rate of energy dissipation in the quasi-resonant layer are independent of the inclination angle. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.873300
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  • 3
    Digitale Medien
    Digitale Medien
    Comment on "Validity of the field line resonance expansion'' [Phys. Fluids B 4, 2713 (1992)] (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1092-1094 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In a recent paper Hansen and Goertz (hereafter HG) [Phys. Fluids B 4, 2713 (1992)] considered the coupling between fast and Alfvén modes in a cold plasma containing a uniform magnetic field (B0xˆ) extending between two perfectly reflecting plane boundaries at constant x. The equilibrium medium is invariant in only one direction (yˆ), and (importantly) the density may vary along the equilibrium field lines, ρ0(x,z). HG sought solutions of the coupled governing PDEs (partial differential equations) for linear perturbations of the form exp i(kyy−ωt). The solution has been studied previously [Planet. Space Sci. 22, 483 (1974); J. Geophys. Res. 79, 1024 (1974)] in the case when ρ0 does not vary along the background field lines, when each Fourier mode in x decouples from the others and may be considered separately—reducing the problem to an ODE (ordinary differential equation). In this case a logarithmic singularity exists at the resonant field line where ω2=k2xV2A(z), VA being the Alfvén speed (V2A=B20/4πρ0). HG claim the introduction of density variation along the equilibrium field causes the modes in x to become coupled resulting in the singular ODE solution becoming a nonsingular solution in the PDE case. If this conclusion is true it is of great importance for researchers in many areas such as solar corona and laboratory plasma heating, and magnetospheric pulsations. Indeed, it suggests that a large portion of the existing literature in these fields is wrong. Clearly it is important to decide whether the calculation of HG is correct or not. In this Comment the equations they set up are analyzed and are solved in a different fashion to HG. The solution found is different from that of HG and in agreement with the existing body of literature. Some sources of error in HG's analysis are pointed out.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.870789
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  • 4
    Digitale Medien
    Digitale Medien
    NITRIC OXIDE DECOMPOSITION INDUCED BY EXCITED NITROGEN MOLECULES IN ACTIVE NITROGEN (1962)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 66 (1962), S. 1747-1748 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100815a510
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  • 5
    Digitale Medien
    Digitale Medien
    THE ACTIVE NITROGEN AFTERGLOW AND THE QUENCHING EFFECT OF ADDED AMMONIA1,2 (1963)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 67 (1963), S. 172-177 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100795a042
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  • 6
    Digitale Medien
    Digitale Medien
    The Reactions of Methylamine and Ethylamine with Atomic Hydrogen (1958)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 62 (1958), S. 657-659 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j150564a006
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  • 7
    Digitale Medien
    Digitale Medien
    Surface Photopolymerization of Vinyl and Diene Monomers (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 953-955 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A 700 W medium pressure Hanovia mercury arc provides a convenient source for surface photopolymeriza-tion of such vinyl monomers as acrylonitrile, methyl methacrylate, and styrene, and diene monomers such as 1,3-butadiene and 2,4-hexadiene. Effective ultra-violet radiation over the range 2000?3500 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/215953a0
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  • 8
    Digitale Medien
    Digitale Medien
    Mercuration of Diazomethane (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 903-903 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The solid (obtained by filtering and drying) was insoluble in all normal solvents except strong acids which detonated it. The infra-red absorption spectrum (mulls in medicinal white oil and 'Fluorolube') showed no evidence of alkyldiazo groupings, or of hydrogen attached to imide nitrogen or ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/199903a0
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  • 9
    Digitale Medien
    Digitale Medien
    Ultraviolet surface-photopolymerization from phenol, cyclohexanol, and ethylbenzene (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1057-1060 
    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 formation of surface-photopolymerized films from the vapors of phenol, cyclohexanol, and ethylbenzene is described. The structures of the films are discussed in terms of their multiple-reflection infrared spectra.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1972.070160501
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  • 10
    Digitale Medien
    Digitale Medien
    Positive and negative photoresist applications of thin films surface-photopolymerized from hexachlorobutadiene (1972)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 12 (1972), S. 209-212 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Polymeric films deposited from the vapor of C4Cl6 by the surface-photopolymerization technique are electrically and mechanically continuous on various substrates when very thin. The thickness of the films depends upon irradiation time with wavelengths in the region 2000-3000Å. Re-irradiation in oxygen (air) of the polymeric films with light of these low wavelengths leads to patterned removal of the films. Since films 500Å thick and less can resist etchants for various substrates, a new and extremely thin positive photoresist system is possible. Resolution of etched substrates to lines a few microns wide has been demonstrated. If the polymeric films from C4Cl6 are deposited from the monomeric vapor at lower substrate temperatures they are soluble in various solvents. Re-irradiation with UV light with the films in vacuum produces a patterned fixing of the polymer with respect to acetone. A negative photoresist system is therefore possible. Again, films of thickness 500Å and less can resist various etchants such that substrates can be etched to high resolution.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760120309
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