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  • 1
    Electronic Resource
    Electronic Resource
    Optical Observations of Extrasolar X-Ray Sources (1970)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 8 (1970), S. 139-160 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.08.090170.001035
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  • 2
    Electronic Resource
    Electronic Resource
    Seasonal variation in species composition of recently settled fouling communities along an environmental gradient in the Indian River Lagoon, Florida
    Amsterdam : Elsevier
    Estuarine and Coastal Marine Science 11 (1980), S. 573-581 
    Details
    ISSN: 0302-3524
    Keywords: Florida ; distribution ; fouling organisms ; inlets ; lagoon
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Geography , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0302-3524(80)80008-9
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  • 3
    Electronic Resource
    Electronic Resource
    Optical counterpart of 2A0311–227 (1979)
    [s.l.] : Nature Publishing Group
    Nature 281 (1979), S. 48-49 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Analysis for radial velocities of the individual spectral scans obtained on the first night showed the star to be a spectroscopic binary of short period. Observations on subsequent nights established a period of 81.04 ?0.01 min (r?f. 1). The velocity curve for H0 is shown in Fig. 2. The phase was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/281048a0
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  • 4
    Electronic Resource
    Electronic Resource
    Attempt to identify Optically PSR 0833-45 (1969)
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 485-486 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A pulse-counting and data-acquisition system, which will be described in a later publication, was used with a conventional, offset-guiding, single-channel photometer and a 1P21 photomultiplier. The recording device, a paper-tape punch, operating at its highest speed, permitted an integration time ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/223485b0
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  • 5
    Electronic Resource
    Electronic Resource
    An experimental study of nonlinear dynamic system identification (1992)
    Springer
    Nonlinear dynamics 3 (1992), S. 1-11 
    Details
    ISSN: 1573-269X
    Keywords: Identification technique ; nonlinear dynamic systems ; identification from noisy measurements ; vibration ; two-point boundary-value problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A technique for robust identification of nonlinear dynamic systems is developed and illustrated using both digital simulations and analog experiments. The technique is based on the Minimum Model Error optimal estimation approach. A detailed literature review is included in which fundamental differences between the current approach and previous work is described. The most significant feature of the current work is the ability to identify nonlinear dynamic systems without prior assumptions regarding the form of the nonlinearities, in contrast to existing nonlinear identification approaches which usually require detailed assumptions of the nonlinearities. The example illustrations indicate that the method is robust with respect to prior ignorance of the model, and with respect to measurement noise, measurement frequency, and measurement record length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045467
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  • 6
    Electronic Resource
    Electronic Resource
    Whirling of a forced cantilevered beam with static deflection. I: Primary resonance (1993)
    Springer
    Nonlinear dynamics 4 (1993), S. 227-249 
    Details
    ISSN: 1573-269X
    Keywords: Cantilevered beams ; nonlinear analysis ; whirling motion ; primary resonances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The response of a slender, clastic, cantilevered beam to a transverse, vertical, harmonic excitation is investigated. The effects of nonlinear curvature, nonlinear inertia, viscous damping and static load are included. Previous work often has neglected the static deflection caused by the weight of the beam, which adds quadratic terms in the governing equations of motion. Galerkin's method is used with three modes and approximate solutions of the temporal equations are obtained by the method of multiple scales. Primary resonance is treated here, and out-of-plane motion is possible in the first and second modes when the principal moments of inertia of the beam cross-section are approximately equal. In Parts II and III, secondary resonances and nonstationary passages through various resonances are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046322
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  • 7
    Electronic Resource
    Electronic Resource
    Whirling of a forced cantilevered beam with static deflection. II: Superharmonic and subharmonic resonances (1993)
    Springer
    Nonlinear dynamics 4 (1993), S. 337-356 
    Details
    ISSN: 1573-269X
    Keywords: Cantilevered beams ; nonlinear analysis ; whirling motion ; secondary resonances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Secondary resonances of a slender, elastic, cantilevered beam subjected to a transverse harmonic load are investigated. The effects of nonlinear curvature, nonlinear inertia, viscous damping and static load are included. Cubic terms in the governing equations lead to subharmonic and superharmonic resonances of order three. The static displacement produced by the weight of the beam introduces quadratic terms in the governing equations, which cause subharmonic and superharmonic resonances of order two. Out-of-plane motion is possible in all of these secondary resonances when the principal moments of inertia of the beam cross section are approximately equal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120670
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  • 8
    Electronic Resource
    Electronic Resource
    On methods for continuous systems with quadratic and cubic nonlinearities (1992)
    Springer
    Nonlinear dynamics 3 (1992), S. 145-162 
    Details
    ISSN: 1573-269X
    Keywords: Averaged Lagrangian ; valve ; resonances ; Galerkin procedure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Methods for determining the response of continuous systems with quadratic and cubic nonlinearities are discussed. We show by means of a simple example that perturbation and computational methods based on first discretizing the systems may lead to erroncous results whereas perturbation methods that attack directly the nonlinear partial-differential equations and boundary conditions avoid the pitfalls associated with the analysis of the discretized systems. We describe a perturbation technique that applies either the method of multiple scales or the method of averaging to the Lagrangian of the system rather than the partial-differential equations and boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00118990
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  • 9
    Electronic Resource
    Electronic Resource
    Whirling of a forced cantilevered beam with static deflection. III: Passage through resonance (1993)
    Springer
    Nonlinear dynamics 4 (1993), S. 461-481 
    Details
    ISSN: 1573-269X
    Keywords: Cantilevered beams ; nonlinear analysis ; transient responses ; passage through resonance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Nonstationary excitations of slender, elastic, cantilevered beams with equal principal moments of inertia are considered. The excitation frequency is slowly increased or decreased through a resonance of the first mode at a constant rate. Three resonances are investigated: primary resonance, superharmonic resonance of order two and subharmonic resonance of order two. After application of Galerkin's method with three modes, the nonlinear, nonstationary response of the first mode of the beam is determined by two methods: integration of the modulation equations obtained from the method of multiple scales, and direct numerical integration of the temporal equations of motion. Time histories are presented and the effects of excitation amplitude, rate of acceleration or deceleration through resonance, damping and initial conditions of the disturbance on the maximum response are studied. The effect of a persistent random disturbance is also examined. Although the excitation acts in the vertical plane, whirling occurs if the beam is subjected to out-of-plane disturbances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053691
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  • 10
    Electronic Resource
    Electronic Resource
    Nonlinear response of a parametrically excited buckled beam (1993)
    Springer
    Nonlinear dynamics 4 (1993), S. 499-525 
    Details
    ISSN: 1573-269X
    Keywords: Chaos ; buckled beam ; parametric resonance ; bifurcations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A nonlinear analysis of the response of a simply-supported buckled beam to a harmonic axial load is presented. The method of multiple scales is used to determine to second order the amplitude- and phase-modulation equations. Floquet theory is used to analyze the stability of periodic responses. The perturbation results are verified by integrating the governing equation using both digital and analog computers. For small excitation amplitudes, the analytical results are in good agreement with the numerical solutions. The large-amplitude responses are investigated by using a digital computer and are compared with those obtained via an analog-computer simulation. The complicated dynamic behaviors that were found include period-multiplying and period-demultiplying bifurcations, period-three and period-six motions, jump phenomena, and chaos. In some cases, multiple periodic attractors coexist, and a chaotic attractor coexists with a periodic attractor. Phase portraits, spectra of the responses, and a bifurcation set of the many solutions are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053693
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