Zobrazeno 1 - 10
of 275
pro vyhledávání: '"Richard L Weaver"'
Autor:
Richard L. Weaver, SangMin Lee
Publikováno v:
Physical Review E. 107
Publikováno v:
Earthquake Science. 34:103-113
Autor:
Richard L. Weaver
Publikováno v:
Advances in Optical Imaging and Photon Migration.
Recent time-domain ultrasonic and numerical experiments on classical waves in two-dimensional Anderson localizing random media are reviewed. It is shown that the transport, albeit weak, occurs on a time scale comparable to a diffusive time scale, and
Publikováno v:
Geophysical Journal International. 222:544-559
SUMMARY Ambient noise correlation has been used extensively to retrieve traveltimes of surface waves. However, studies of retrieving amplitude information and attenuation from ambient noise are limited. In this study, we develop methods and strategie
Publikováno v:
Geophysical Journal International. 221:265-272
SUMMARY Due to the partly diffuse character of ambient noise, the retrieval of amplitude information and attenuation from noise cross-correlations has been difficult. Here, we apply the temporal reweighting method proposed by Weaver & Yoritomo to sei
Autor:
Sang Min Lee, Richard L. Weaver
Publikováno v:
The Journal of the Acoustical Society of America. 150(2)
Approximate analytic and numerical theories are developed with which to model, and compare with laboratory measurements, the diffuse ultrasonic field transmitted from one elastic body to another through a resonant coupling. Particular focus is on the
Autor:
Richard L. Weaver, John Y. Yoritomo
Publikováno v:
Physical Review E. 101
Slow dynamic nonlinearity describes a poorly understood, creep-like phenomena that occurs in brittle composite materials such as rocks and cement. It is characterized by a drop in stiffness induced by a mechanical conditioning, followed by a log(time
Autor:
Richard L. Weaver, John Y. Yoritomo
Publikováno v:
Physical review. E. 102(1-1)
Slow dynamic nonlinearity is widely observed in brittle materials with complex heterogeneous or cracked microstructures. It is seen in rocks, concrete and cracked glass blocks. Unconsolidated structures show the behavior as well: aggregates of glass
Autor:
Richard L. Weaver, John Y. Yoritomo
Publikováno v:
The Journal of the Acoustical Society of America. 143:3706-3719
The authors consider the retrieval of Green functions G from the correlations of non-stationary non-fully diffuse noise incident on an array of sensors. Multiple schemes are proposed for optimizing the time-varying weights with which correlations may
Publikováno v:
The European Physical Journal Special Topics. 226:1371-1408
We report measurements and theory on the distribution and evolution of diffuse ultrasonic waves in elastic bodies with weakly broken axisymmetry. Aluminum cylinders with dimensions large compared to wavelength were excited by transient point sources