نتایج جستجو برای: seismic frequencies henley
تعداد نتایج: 131312 فیلتر نتایج به سال:
[i] We show that ocean temperature profiles can be accurately recovered using only acoustic methods employed at the sea surface. Using a towed air gun array and a hydrophone streamer, thermohaline boundaries are ensonified at a suite of frequencies and angles, yielding travel time trajectories and reflectivities. These data are inverted via full waveform inversion to estimate sound speed and, s...
Seismic analysis model is required to evaluate themechanical structural integrity of reactor internals when earthquakeis occurred. Finite element method is used to prepare a seismicanalysis model for reactor internals. The reactor internals arecomplex mechanical structures, so much analysis time is requiredto obtain the seismic responses with the detail finite element model....
We discuss three stacking deconvolution techniques for enhancing signal of earth structure contained in the seismograms of teleseismic body waves recorded by a seismometer array. The goal of the deconvolution is to remove from the seismograms the complications due to the source. For three-component data the removal of the source can be efficiently achieved by deconvolving one component from ano...
Online identification of sinusoidal components is an important problem that occurs in active noise control, vibration suppression, on line health monitoring, and radar, sonar, and seismic applications. We adopt a new approach to this identification problem which consists of the utilization of the underlying nonlinearlity and an algorithm that is based on the nonlinear parameterization. The algo...
interferometric gravitational wave detectors must be isolated from seismic noise. The VIRGO vibration isolator, called superattenuator, is fully effective at frequencies above 4 Hz. Nevertheless, the residual motion of the mirror at the mechanical resonant frequencies of the system are too large for the interferometer locking system and must be damped. A multidimensional feedback system, using ...
interferometric gravitational wave detectors must be isolated from seismic noise. The VIRGO vibration isolator, called superattenuator, is fully effective at frequencies above 4 Hz. Nevertheless, the residual motion of the mirror at the mechanical resonant frequencies of the system are too large for the interferometer locking system and must be damped. A multidimensional feedback system, using ...
We use low-degree acoustic modes obtained by the BiSON to estimate the mainsequence age t⊙ of the Sun. The calibration is accomplished by linearizing the deviations from a standard solar model the seismic frequencies of which are close to those of the Sun. Formally, we obtain the preliminary value t⊙ = 4.68±0.02Gy, coupled with an initial heavy-element abundance Z = 0.0169± 0.0005. The quoted s...
Giant flares from soft gamma-ray repeaters (SGRs) are one of the most violent phenomena in neutron stars. Quasi-periodic oscillations (QPOs) with frequencies ranging from 18 to 1840 Hz have been discovered in the tails of giant flares from two SGRs, and were ascribed to be seismic vibrations or torsional oscillations of magnetars. Here we propose an alternative explanation for the QPOs in terms...
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