Results 221 to 230 of about 51,311 (264)
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Broad-band excitation pulses of arbitrary flip angle
Physical Review Letters, 1989We address the problem of broad-band excitation through an arbitrary flip angle \ensuremath{\gamma} in two-level systems via single-phase, amplitude-modulated irradiation. The Floquet formalism and perturbation treatment are used to derive the modulation sequences. Sideband amplitudes are a continuous function of \ensuremath{\gamma}.
, Zax, , Vega
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Generating piecewise-constant excitations with an arbitrary power spectrum
IEE Proceedings - Control Theory and Applications, 1995A comparison is made between zero-order-hold-noise (ZOH-noise) and ZOH-periodic excitations. Their ability to excite a system with maximum power and a specified power spectrum, while the peak value of the excitation is restricted, is studied.
Schoukens, Joannes +2 more
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IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2012
This paper reports theoretical analysis and experimental results on a numerical electrode shaping design technique that permits the excitation of arbitrary modes in arbitrary geometries for piezoelectric resonators, for those modes permitted to exist by the nonzero piezoelectric coefficients and electrode configuration.
Jeffrey S, Pulskamp +6 more
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This paper reports theoretical analysis and experimental results on a numerical electrode shaping design technique that permits the excitation of arbitrary modes in arbitrary geometries for piezoelectric resonators, for those modes permitted to exist by the nonzero piezoelectric coefficients and electrode configuration.
Jeffrey S, Pulskamp +6 more
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Frequency domain substructural identification for arbitrary excitations
Earthquake Engineering & Structural Dynamics, 2011SUMMARYStructural identification based on analysis of vibration signals is usually formulated as an optimization problem. Nevertheless, identifying a structural system as a whole often involves a great number of unknowns and degrees of freedom, resulting in considerable convergence difficulty and expensive evaluation of objective function.
Zhang, Z., Koh, C.G., Perry, M.J.
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Arbitrary Spectral Shaping of Plasmonic Broadband Excitations
Frontiers in Optics 2015, 2015Surface plasmon polaritons having an arbitrary broadband spectrum are launched using holographic gratings, allowing unprecedented control over the temporal shape. Among the potential applications are broadband sensors and ultrashort pulse shaping.
Yuval Tsur, Itai Epstein, Ady Arie
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Arbitrary Excitation of Dynamical Systems
2016This chapter deals with fundamental functions of linear dynamical systems including the transfer function, Green’s function, Duhamel’s integral, and standardizing function. We show their application to different problems dealing with dynamical systems.
Igor A. Karnovsky, Evgeniy Lebed
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Response of a ring-down cavity to an arbitrary excitation
The Journal of Chemical Physics, 1996An eigenmode analysis of the response of an empty ring-down cavity to an arbitrary laser excitation is presented. By explicitly taking into account both the mode structure of the ring-down cavity and the spectral content of the laser pulse, it is found that the complicated ring-down signals commonly observed in the laboratory can be interpreted in ...
Joseph T. Hodges +2 more
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An Energetic Criterion for Dynamic Instability of Structures Under Arbitrary Excitations
International Journal of Structural Stability and Dynamics, 2015An energetic criterion for identifying the global dynamic instability of structures subjected to any kind of excitations is proposed in the paper. The concept of dynamic stability for structures is firstly interpreted and distinguished from the stability concept in the Lyapunov sense. It is demonstrated that the dynamic instability depends not only on
Xu, Jun, Li, Jie
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Quasi-magnetostatic solution for a conducting and permeable spheroid with arbitrary excitation
IEEE Transactions on Geoscience and Remote Sensing, 2002Broad-band electromagnetic induction (EMI) methods are promising in the detection and discrimination of subsurface metallic targets. In this paper, the quasi-magnetostatic solution for a conducting and permeable prolate spheroid under arbitrary excitation by a time-harmonic primary field is obtained by using the separation of variables method with ...
Chi O. Ao +3 more
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On the Stability of the Damped Hill’s Equation With Arbitrary, Bounded Parametric Excitation
Journal of Applied Mechanics, 1993The minimum damping for asymptotic stability is predicted for Hill’s equation with any bounded parametric excitation. It is shown that the response of Hill’s equation with bounded parametric excitation is exponentially bounded. The parametric excitation maximizing the bounding exponent is identified by time optimal control theory. This maximal bounding
Rahn, C. D., Mote, C. D. jun.
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