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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of transient and asymptotic behavior in relativistic Landau damping (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4049-4058 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Relativistic electrostatic oscillations in a collisionless nonmagnetized plasma are considered. An integral form of the Vlasov–Poisson problem is solved numerically and both the transient and the asymptotic behavior of the electric field are calculated in a very accurate way. The existence of a critical value for the wave number, under which no Landau damping occurs, has been verified, and the asymptotic behavior of the oscillations in the one-dimensional kinetic model has been evaluated. Some errors have been found in previously published analytical expressions. A new expression is proposed and verified numerically. An analytical expression of the asymptotic behavior for full three-dimensional kinetic model is deduced and numerically tested. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871028
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  • 2
    Electronic Resource
    Electronic Resource
    A model for evaluating compression effects in the mθ=1 diocotron instability (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1133-1140 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Herein is presented a refinement of the theory published by Finn et al. (1999) for the mθ=1 diocotron instability. A rigorous definition of the plasma length is introduced and the expression for the velocity field is improved, inasmuch as the effect of the finite size of the plasma column is included. The effect of the perturbation of the plasma length is considered rigorously by using a Green-function approach. A parametric study of the instability for a hollow profile is shown. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1350672
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic theory of charged particles of variable shape (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2229-2238 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently a new kind of computational technique for kinetic plasma simulation has been developed, making use of particles of variable shape (blobs). The aim of the present work is to derive a kinetic equation governing the evolution of the blobs and solve it in the case of small perturbations. Results are compared with those obtained for the real plasma and for a plasma of particles of fixed shape (the model usually employed in popular particle-in-cell simulations). The comparison is useful to find out whether the additional cost of dealing with more degrees of freedom is balanced by the superior accuracy provided by the new technique in describing the phase-space distribution. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871930
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  • 4
    Electronic Resource
    Electronic Resource
    New approach to the problem of the propagation of electrostatic perturbations in Vlasov plasmas (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3827-3837 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The present paper represents a revisitation of the classical problem of the propagation of longitudinal electrostatic waves in a plasma. Within the linearized Vlasov equation model, a new technique is proposed that does not utilize both Fourier and Laplace transformations as is customary, but rather leads to a time convolutive integral equation for the plasma density. This approach seems to present two main advantages: first, one can avoid some analytical difficulties found with the usual treatments; second, the integral equation obtained can be solved by means of direct numerical techniques that do not require the use of integral transformations. Some typical results obtained by means of the proposed method are presented and discussed. Finally, the possible use of the present methodology for the study of the spatial distribution induced in a plasma by an external harmonic electric field is shown and some of its interesting physical features are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860339
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  • 5
    Electronic Resource
    Electronic Resource
    Cleavage of the (1-〉3)-2-acetamido-2-deoxy-β-d-glucopyranosyl linkage present in keratan sulfate. The A and B isoenzymes of human liver hexosaminidase (EC 3.2.1.30)
    Amsterdam : Elsevier
    Carbohydrate Research 96 (1981), S. 271-279 
    Details
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0008-6215(00)81877-7
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of cut-off wavelength in monomode fibres by a polarization method (1985)
    Springer
    Optical and quantum electronics 17 (1985), S. 41-45 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A method for the measurement of cut-off wavelength of higher order mode in monomode fibres, based on the different polarization properties of the modes, is discussed. It permits one to derive the fraction of power guided in the fundamental mode, at each wavelength. Experimental results that prove the reliability and the accuracy of the method are provided. Criteria for the choice of the sample length for the measurement are also discussed. Finally a very simplified, yet precise, measurement procedure is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619992
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  • 7
    Electronic Resource
    Electronic Resource
    Theory of scattering in multimode optical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 283-309 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The problem of scattering in multimode optical fibres is treated in a rigorous way by means of both a ray and a statistical approach. These two methods are interlaced and harmonized. Applications to microbending, ellipticity, core radius and maximum numerical aperture variations, and fluctuations of index profile shape are performed. Useful results about power distribution and fibre attenuation are derived in each case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619740
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of joints on mode power distribution and losses in multimode optical fibres (1983)
    Springer
    Optical and quantum electronics 15 (1983), S. 143-153 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The transformation of mode power distribution at a joint between two different (even elliptical) optical fibres is studied. Simple analytical expressions are obtained also in the most general coupling and mismatch configuration, provided that coupling errors and mismatch parameters are small. Detailed calculations of joint losses are performed in each case, including propagation effects in both fibres. Original results are obtained particularly in the cases of misalignment, end separation between the fibres, mismatches in index profiles and coupling between two elliptical fibres. A strong dependence on the launching conditions and the amount of mode coupling is evidenced in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00612825
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  • 9
    Electronic Resource
    Electronic Resource
    Scattering in optical fibres: analysis of mode degeneration (1984)
    Springer
    Optical and quantum electronics 16 (1984), S. 141-156 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Mode degeneration and mode conversion in multimode optical fibres are the main subjects of this work. In particular it is shown how fluctuations of the core shape can cause a rapid degeneration among the modes with the same azimuthal mode number. This allows a rigorous single variable approach to the second problem obtaining evident simplifications. The formalism proposed is applied to the study of mode distribution in the general case of microbending, of core-radius fluctuations in fibres with power law profiles and for simultaneous presence of microbending and ellipticity in parabolic fibres with differential mode attenuation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620132
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  • 10
    Electronic Resource
    Electronic Resource
    Statistical analysis of intrinsic joint losses in mismatched multimode fibres (1983)
    Springer
    Optical and quantum electronics 15 (1983), S. 155-171 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effects of manufacturing variations in geometrical and optical parameters of multimode fibres on intrinsic joint losses are studied by means of a statistical approach. The analysis is performed considering different real conditions of propagation and statistical distributions of fibre parameters. The effects of a cascade of joints and of different jointing techniques are also studied. The calculations are carried out using the real tolerances recommended by the standardization organizations, through a simulation of some 500 000 joints. Except for the case of mismatch of numerical aperture (whose tolerance is relatively large) a mean joint loss of 0.07–0.2 dB and a 98th percentile of joint loss of 0.4–0.7 dB is obtained, depending on the statistical distribution of fibre parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00612826
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