نتایج جستجو برای: seismic frequencies henley
تعداد نتایج: 131312 فیلتر نتایج به سال:
We investigate the influence of the ionization of helium on the low-degree acoustic oscillation frequencies in model solar-type stars. The signature in the oscillation frequencies characterizing the ionization-induced depression of the first adiabatic exponent γ is a superposition of two decaying periodic functions of frequency ν, with ‘frequencies’ that are approximately twice the acoustic dep...
Context. There are many unknowns surrounding the formation of subdwarf B stars, and different formation channels are considered to be possible. Nevertheless, seismic models up to date assume that an sdB star is a post-helium-flash-core surrounded by a thin inert layer of hydrogen. Aims. We examine an alternative formation channel, in which the sdB star originates from a massive (> ∼2 M ) Red Gi...
Shear wave seismic reflection was used to delineate cyclic deposits of massive ice and glacial till in the upper 30 m at a site near Tuktoyaktuk, Northwest Territories, Canada. Shear wave reflections with dominant frequencies in excess of 350 Hz were recorded with a steel shaft and 1 kg hammer source and single 50 Hz horizontal geophones with 30 cm spikes. A least four reflecting interfaces bet...
A new seismic isolation system, TAMA Seismic Attenuation System (TAMA-SAS), was installed to TAMA300 in order to improve the sensitivity at low frequencies. Inertial damping is one of the hierarchical control systems of the TAMA-SAS which are employed to give full play to its ability. We have established two servo loops to control the Inverted Pendulum (IP) which composes the SAS. One is the se...
Using the ASAS data, we determine pulsational frequencies of high-amplitude $\delta$ Sct star BP Pegasi. The analysis revealed only two known, independent frequencies. On basis multicolour Str\"omgren photometry, independently find that both can be associated with radial modes which, according to frequency ratio, are fundamental and first overtone modes. models fitting depend strongly on opacit...
SUMMARY An accurate definition of geometry of complex subsurface bodies, such as salt intrusions, is crucial for imaging below such targets. Full-waveform inversion (FWI) is a method for building high-resolution seismic velocity models from nonlinear iterative minimization of the misfit between observed and synthetic seismic data. The ability of FWI to accurately recover the geometry of salt bo...
We apply skeletonization approach to geophysical data to recognize geologic structures and pick seismic horizons automatically. We formulate the technique to be explicitly applicable to all gridded geophysical data. The method consists in extracting multiple features of “wavelets” which may be single or double peaks or troughs characterized by amplitudes, widths, orientation angles, spatial dim...
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