1,721,006 research outputs found
Oral history interview of 1988 YMCA Hall of Fame Inductee Rix Rogers
No full textThis is an oral history self interview of the 1988 YMCA Hall of fame Inductee, Rix G. Rogers. The audio lasts for around 34 minutes and was recorded on two sides of a cassette. The first side lasted around 32 minutes and the second side for around 3. The exact date the recording was made is not known, though it is thought to have been recorded in 1988 the year that he was inducted. On the tape Rix Rogers answers seven questions submitted by Mary Hedge, the director of Archives at the New York City YMCA.For more information on Rix G. Rogers, see https://springfield.as.atlas-sys.com/agents/people/749Digital technician who digitized file wrote, "Slightly noisy, but intelligible"
Arbitrer un match de rugby à XV : analyser ou agir ?
No full textRix G., Biache M.-J. Arbitrer un match de rugby à XV : analyser ou agir ?. In: Les Cahiers de l'INSEP, n°34, 2003. Expertise et sport de haut niveau. pp. 331-335
Simultaneous Inversion of Rayleigh Phase Velocity and Attenuation for Near- Surface Site Characterization
No full textDeformation of landfill from measurements of shear wave velocity and damping - Discussion
Full text linkThe author presents a method for using in-situ seismic test results to estimate the short-term deformations of geomaterials. The effort to introduce rational algorithms for the evaluation of settlements of shallow foundations on the basis of measured physical quantities is noteworthy, considering that current geotechnical design, especially on small-scale projects, is often based on empirical correlations between
settlements and penetration test results that rarely reflect the actual site conditions. In this context the development of simple procedures based on the results of relatively inexpensive in-situ tests including seismic tests is of paramount importance.
Nevertheless it is important to account properly for the physics of wave propagation when inferring material parameters from seismic test results. In this respect, the writers would like to make some observations related to the methods used to evaluate the shear wave velocity and material
damping ratio of the solid waste from surface wave measurements. This discussion is focused on and restricted to the aspects of the paper related to the use of surface wave methods to estimate the waste properties
Simultaneous Measurement and Inversion of Surface Wave Dispersion and Attenuation Curves
No full textSurface wave tests are non-invasive seismic techniques that have traditionally been used to determine the shear wave velocity (i.e. shear modulus) profile of soil deposits and pavement systems. Recently, Rix et al. [J. Geotech. Geoenviron. Engng 126 (2000) 472] developed a procedure to obtain near-surface values of material damping ratio from measurements of the spatial attenuation of Rayleigh waves. To date, however, the shear wave velocity and shear damping ratio profiles have been determined separately. This practice neglects the coupling between surface wave phase velocity and attenuation that arises from material dispersion in dissipative media. This paper presents a procedure to measure and invert surface wave dispersion and attenuation data simultaneously and, thus, account for the close coupling between the two quantities. The methodology also introduces consistency between phase velocity and attenuation measurements by using the same experimental configuration for both. The new approach has been applied at a site in Memphis, TN and the results obtained are compared with independent measurements
Propagation of data uncertainty in surface wave inversion
No full textAlthough in recent years surface wave methods have undergone significant development that has
greatly enhanced their capabilities, little effort has been spent to determine the uncertainty associated
with surface wave measurements. The objective of this study is to determine how the uncertainty of the
experimental data is mapped into the uncertainty of the shear wave velocity profile via the inversion
algorithm. The methodology developed in this study for estimating the uncertainty of the shear wave
velocity profile from surface wave measurements is based on the assumption that the experimental data
are normally distributed. The validity of this hypothesis was experimentally verified using data gathered
at two sites in Italy where surface wave tests were performed using linear arrays of multiple receivers.
The experimental dispersion curve measured at the site was subsequently inverted to obtain the
expected shear wave velocity profile together with an estimate of the associated standard deviation. The
final results show that uncorrelated noise has a very little influence on multistation surface wave tests,
confirming their robustness for applications in noisy environments
Simultaneous Measurement and Inversion of Surface Wave Dispersion and Attenuation Curves
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