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Excitation

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Excitation - Free Register to Access Experts & Abstracts

Kazufumi Yazaki - One of the best experts on this subject based on the ideXlab platform.

  • Life time of soft multipole Excitations
    European Physical Journal A, 1995
    Co-Authors: Hiroyuki Sagawa, Noboru Takigawa, Nguyen Van Giai, M Ishihara, Kazufumi Yazaki
    Abstract:

    Decay of soft multipole Excitations in halo nuclei is studied in comparison with the potential resonance state. Although the soft Excitation has a sharp peak just above the particle threshold and carries extremely large transition strength, the decay rate looks much faster than that expected for a resonance state. Consequently, the half life is shown to be several orders of magnitude shorter than what one naively expects from the uncertainty principle. It is shown also that the soft Excitations accumulate large transition strength as a non-resonant single-particle Excitation, but not as particle-hole collective Excitations like giant resonances.

Izuru Takewaki - One of the best experts on this subject based on the ideXlab platform.

  • Overview of Seismic Critical Excitation Method
    Critical Excitation Methods in Earthquake Engineering, 2013
    Co-Authors: Izuru Takewaki
    Abstract:

    This chapter presents a detailed overview of the seismic critical Excitation method. It begins by defining critical Excitation. It is natural to imagine that a ground motion input resonant to the natural frequency of the structure is a critical Excitation. The method of critical Excitation was proposed by Drenick for linear elastic, viscously damped single-degree-of-freedom systems in order to take into account inherent uncertainties in ground motions. This method is aimed at finding the Excitation producing the maximum response from a class of allowable inputs. It was suggested that the critical Excitation introduced by Drenick is conservative compared to the recorded ground motions. To resolve this problem, the concept of “subcritical Excitation” was introduced. The concept of critical Excitation may enable structural designers to make ordinary buildings more seismic resistant. However, critical Excitation problems for fully nonstationary Excitations and critical Excitation problems for elasto-plastic responses under those Excitations are challenging problems.

  • Chapter 1 – Overview of Seismic Critical Excitation Method
    Critical Excitation Methods in Earthquake Engineering, 2007
    Co-Authors: Izuru Takewaki
    Abstract:

    Publisher Summary This chapter presents a detailed overview of seismic critical Excitation method. It begins by defining the critical Excitation. It is natural to imagine that a ground motion input resonant to the natural frequency of the structure is a critical Excitation. The method of critical Excitation was proposed by Drenick for linear elastic, viscously damped SDOF systems in order to take into account inherent uncertainties in ground motions. This method is aimed at finding the Excitation producing the maximum response from a class of allowable inputs. It was suggested that the critical Excitation introduced by Drenick is conservative compared to the recorded ground motions. To resolve this problem, the concept of “subcritical Excitation” was introduced. The concept of critical Excitation may enable structural designers to make ordinary buildings more seismic resistant. However, critical Excitation problems for fully non-stationary Excitations and critical Excitation problems for elasto-plastic responses under those Excitations are challenging problems.

Hiroyuki Sagawa - One of the best experts on this subject based on the ideXlab platform.

  • Life time of soft multipole Excitations
    European Physical Journal A, 1995
    Co-Authors: Hiroyuki Sagawa, Noboru Takigawa, Nguyen Van Giai, M Ishihara, Kazufumi Yazaki
    Abstract:

    Decay of soft multipole Excitations in halo nuclei is studied in comparison with the potential resonance state. Although the soft Excitation has a sharp peak just above the particle threshold and carries extremely large transition strength, the decay rate looks much faster than that expected for a resonance state. Consequently, the half life is shown to be several orders of magnitude shorter than what one naively expects from the uncertainty principle. It is shown also that the soft Excitations accumulate large transition strength as a non-resonant single-particle Excitation, but not as particle-hole collective Excitations like giant resonances.

C Buehler - One of the best experts on this subject based on the ideXlab platform.

  • quantitative analysis of magnetic Excitations in landau flux closure structures using synchrotron radiation microscopy
    Physical Review Letters, 2005
    Co-Authors: Jorg Raabe, C Quitmann, C H Back, F Nolting, S L Johnson, C Buehler
    Abstract:

    We have measured the Excitation spectrum of six micron magnetic squares using x-ray magnetic circular dichroism. We observe all three Excitations expected in a Landau flux-closure pattern. High temporal and spatial resolution allows quantitative analysis of the Excitations. A short magnetic in plane pulse excites the magnetic element and we observe precessional motion of the magnetization within the domains as well as a domain wall mode and vortex motion. The vortex moves perpendicular to the Excitation field and relaxes without showing a circulating orbit.

Peter Feulner - One of the best experts on this subject based on the ideXlab platform.

  • atom selective bond breaking in a chemisorbed homonuclear molecule induced by core Excitation n2 ru 001
    Physical Review Letters, 2000
    Co-Authors: Raymonda Romberg, N Heckmair, S P Frigo, A Ogurtsov, D Menzel, Peter Feulner
    Abstract:

    : We observe photochemical selectivity for N 1s to pi(*) Excitations of chemisorbed N2. By narrow bandwidth synchrotron radiation we selectively excite one of the two atoms of the molecule. Photon stimulated desorption of neutral N atoms predominates for Excitations of the N atom close to the surface, whereas Excitation of the outer atom ejects predominantly N02 and small amounts of N+, demonstrating the predominant breaking of the inner or outer bond, respectively, of the N2 adsorbate. Analysis on the basis of previously obtained decay electron spectra after atom-selective Excitation can explain the mechanism of localized bond breaking.

  • Atom-selective bond breaking in a chemisorbed homonuclear molecule induced by core Excitation: N2/Ru(001)
    Physical Review Letters, 2000
    Co-Authors: Raymonda Romberg, S P Frigo, A Ogurtsov, D Menzel, Heckmair N, Peter Feulner
    Abstract:

    : We observe photochemical selectivity for N 1s to pi(*) Excitations of chemisorbed N2. By narrow bandwidth synchrotron radiation we selectively excite one of the two atoms of the molecule. Photon stimulated desorption of neutral N atoms predominates for Excitations of the N atom close to the surface, whereas Excitation of the outer atom ejects predominantly N02 and small amounts of N+, demonstrating the predominant breaking of the inner or outer bond, respectively, of the N2 adsorbate. Analysis on the basis of previously obtained decay electron spectra after atom-selective Excitation can explain the mechanism of localized bond breaking.