On the sound speed dispersion and the frequency dependence of sound attenuation in a fine-grained sediment in the New England Mud Patch

2019 ◽  
Vol 146 (4) ◽  
pp. 2930-2930
Author(s):  
Lin Wan ◽  
Mohsen Badiey ◽  
David Knobles ◽  
Preston S. Wilson
Keyword(s):  
New England ◽  
Frequency Dependence ◽  
Sound Speed ◽  
Sound Attenuation ◽  
Fine Grained

Frequency dependence of sound speed and attenuation in fine-grained sediments from 25 to 250 kHz based on a probe method

2018 ◽  
Vol 160 ◽  
pp. 45-53 ◽  
Author(s):  
Jingqiang Wang ◽  
Baohua Liu ◽  
Guangming Kan ◽  
Guanbao Li ◽  
Jiewen Zheng ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Sound Speed ◽  
Probe Method ◽  
Fine Grained

Statistical Inference of Sound Speed and Attenuation Dispersion of a Fine-Grained Marine Sediment

2021 ◽  
pp. 1-12
Author(s):  
David Paul Knobles ◽  
Christian D. Escobar-Amado ◽  
Michael J. Buckingham ◽  
William S. Hodgkiss ◽  
Preston S. Wilson ◽  
...  
Keyword(s):  
Statistical Inference ◽  
Marine Sediment ◽  
Sound Speed ◽  
Fine Grained

Fingerprinting windblown dust in south-eastern Australian soils by uranium-lead dating of detrital zircon

Soil Research ◽  
2001 ◽  
Vol 39 (1) ◽  
pp. 7 ◽  
Author(s):  
Robyn D. Gatehouse ◽  
I. S. Williams ◽  
B. J. Pillans
Keyword(s):  
New England ◽  
New South ◽  
Fold Belt ◽  
Fine Grained ◽  
South Eastern ◽  
South Wales ◽  
Murray Darling Basin ◽  
Eastern Australia ◽  
Uranium Lead Dating ◽  
Eastern Highlands

The U-Pb ages of fine-grained zircon separated from 2 dust-dominated soils in the eastern highlands of south-eastern Australia and measured by ion microprobe (SHRIMP) revealed a characteristic age ‘fingerprint’ from which the source of the dust has been determined and by which it will be possible to assess the contribution of dust to other soil profiles. The 2 soils are dominated by zircon 400–600 and 1000–1200 Ma old, derived from Palaeozoic granites and sediments of the Lachlan Fold Belt, but also contain significant components 100–300 Ma old, characteristic of igneous rocks in the New England Fold Belt in northern New South Wales and Queensland. This pattern closely matches that of sediments of the Murray-Darling Basin, especially the Mallee dunefield, suggesting that weathering of rocks in the eastern highlands has contributed large quantities of sediment to the arid and semi-arid inland basins via internally draining rivers of the present and past Murray–Darling River systems, where it has formed a major source of dust subsequently blown eastwards and deposited in the highland soils of eastern Australia.

Frequency dependence of sound speed and attenuation in marine sediments

2006 ◽  
Vol 120 (5) ◽  
pp. 3099-3099
Author(s):  
William M. Carey ◽  
Ji‐Xun Zhou ◽  
Allan D. Pierce
Keyword(s):  
Frequency Dependence ◽  
Marine Sediments ◽  
Sound Speed

Shipboard low frequency sound speed measurements in the New England Mud Patch

2016 ◽  
Vol 139 (4) ◽  
pp. 2111-2111
Author(s):  
Gabriel R. Venegas ◽  
Preston S. Wilson ◽  
Kevin M. Lee ◽  
Megan S. Ballard ◽  
Allen H. Reed ◽  
...  
Keyword(s):  
New England ◽  
Sound Speed ◽  
Low Frequency ◽  
Frequency Sound

Crack Dynamics and Grain Size

1994 ◽  
Vol 362 ◽  
Author(s):  
John J. Gilman
Keyword(s):  
Grain Size ◽  
Kinetic Energy ◽  
Sound Speed ◽  
Maximum Stress ◽  
Size Dependence ◽  
Terminal Velocity ◽  
Moving Crack ◽  
Fine Grained ◽  
Crack Dynamics ◽  
Relative Kinetic

AbstractTwo aspects of fast cracks are considered: 1. the terminal velocity, and corresponding relative kinetic energy; 2. the grain size dependence of the fracture. It is argued that this is determined by the kinetic energies of cracks when they have expanded enough to reach the boundaries of the grains in which they lie. This is more consistent with the observed facts than the more usual quasi-static models.By considering the limiting conditions at the very tip of a moving crack, many complications are avoided in calculating the terminal velocity. The maximum transverse acceleration of material is limited by the maximum stress (cohesive) that can be applied. The resulting terminal velocity is: 0.4 vs, where vs is the longitudinal sound speed; compared with measured values which average about: 0.31 vs.In polycrystals, microcracks are found when the applied stress exceeds the yield stress. However, the microcracks do not propagate in fine-grained specimens because they do not have enough kinetic energy to cross a typical grain boundary. This leads to the observed dependence of the fracture stress on the grain size.

Shipboard low frequency sound speed measurements in the New England Mud Patch (NEMP)

2016 ◽  
Author(s):  
Gabriel R. Venegas ◽  
Preston S. Wilson ◽  
Kevin M. Lee ◽  
Megan S. Ballard ◽  
Allen H. Reed ◽  
...  
Keyword(s):  
New England ◽  
Sound Speed ◽  
Low Frequency ◽  
Frequency Sound
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