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cavitation

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Journal Article
Journal: Geophysics
Published: 19 April 2016
Geophysics (2016) 81 (3): P33-P46.
...Martin Landrø; Yuan Ni; Lasse Amundsen ABSTRACT Ghost cavitation, which is a term describing that cavitation bubbles are generated acoustically, has been hypothesized to occur when the ghost reflected signals from many individual air guns beneath the sea surface produce a pressure that is close...
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Journal Article
Journal: Geology
Published: 01 March 2015
Geology (2015) 43 (3): 227-230.
... from synchrotron X-ray microtomography. Such C′-type bands are interpreted as creep cavitation bands resulting from diffusion creep deformation associated with grain boundary sliding. Mass-balance calculation indicates a 2% volume increase during the protolith-ultramylonite transformation, which...
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Journal Article
Published: 01 May 2006
Journal of the Geological Society (2006) 163 (3): 447-460.
... in lithifying concretions and, through cavitation and CO 2 degassing, a trigger for rapid homogeneous nucleation of calcite. Many of the early structures were subsequently reactivated as brittle tensile fractures, and host a variety of mesogenetic cements. Reactivation probably occurred in response to stress...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2000
GSA Bulletin (2000) 112 (3): 490-503.
... of fluvial erosion (e.g., plucking, abrasion, cavitation, solution) is a strong function of substrate lithology, and that joint spacing, fractures, and bedding planes exert the most direct control. The relative importance of the various processes and the nature of the interplay between them are inferred from...
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Journal Article
Journal: Geology
Published: 01 August 1999
Geology (1999) 27 (8): 695-698.
...John G. Spray Abstract Cavitation is proposed as a mechanism for the discrete generation of high-pressure–high-temperature polymorphs in veins within meteorites and hypervelocity impact structures. Cavitation involves the inception, isothermal growth, and adiabatic implosion of bubbles...
Journal Article
Journal: Geophysics
Published: 01 November 1993
Geophysics (1993) 58 (11): 1565-1572.
... overpressure into a downgoing rarefaction. Momentum transfer surges the fluid. Surges accumulate. Two rarefaction shocks eventually collide at the shot point. The fluid there cavitates if the net pressure drops to zero. Fluid moving above the shot rises. The column splits into two parts. Column separation...
Image
Comparison of ghost <b>cavitation</b> amplitude (after absolute value and smoothin...
in > Geophysics
Published: 19 April 2016
Figure 23. Comparison of ghost cavitation amplitude (after absolute value and smoothing) for (a) full source (9 m depth and 6.5 m separation distance) and (b) modeled amplitude response. (a) The black curve represents 2 kHz high pass, the dark gray 10 kHz, and the light gray 100 kHz high pass
Image
Doming, <b>cavitation</b>, and granular fountaining. Thin dashed arrows represent ...
Published: 01 March 2016
Fig. 2. Doming, cavitation, and granular fountaining. Thin dashed arrows represent explosive decompression of argon gas that opens the primary cavity; thick dashed arrows depict gas released from the orifice but still remaining in the crucible after the initial cavity generation. Continuous-line
Image
Schematic drawing of <b>cavitation</b> during grain boundary sliding in shear (aft...
in > Geology
Published: 01 March 2015
Figure 4. Schematic drawing of cavitation during grain boundary sliding in shear (after Pilling and Ridley, 1989 ). Elongation orientation of pores will depend on extent of dilatancy.
Image
Flow depth and velocity guide for evaluating the <b>cavitation</b> mode of rock sc...
Published: 01 November 2013
Figure 1. Flow depth and velocity guide for evaluating the cavitation mode of rock scour in open channels. Modified from Keaton et al. (2012) . V cr line denotes threshold of critical flow (Froude number  =  1.0); V cav lines denote boundaries of cavitation regions; g is acceleration
Image
<b>Cavitation</b> of a DU–WF tensiometer ( Lourenço  et al . 2008 ).
Published: 01 February 2011
Fig. 5 Cavitation of a DU–WF tensiometer ( Lourenço et al . 2008 ).
Image
<b>Cavitation</b> tests on a UNINA tensiometer ( Rojas  et al . 2008 ).
Published: 01 February 2011
Fig. 6 Cavitation tests on a UNINA tensiometer ( Rojas et al . 2008 ).
Image
Figure 7. Conditions for <b>cavitation</b> inception. All calculations for atmosph...
Published: 01 March 2000
Figure 7. Conditions for cavitation inception. All calculations for atmospheric pressure (sea level) and water temperature of 10 °C. (A) Critical velocities for cavitation as a function of flow depth are calculated for σ c = 4 (possible cavitation dashed line) and σ c = 2 (likely cavitation thin
Journal Article
Published: 01 August 2013
Quarterly Journal of Engineering Geology and Hydrogeology (2013) 46 (3): 293-302.
... of the Lower Aquifer. Cavitation within the granular beds of the Lower Aquifer would have occurred as a consequence of drawdown from the extensive water extraction that began at the start of the nineteenth century, resulting in the water table dropping by almost 70 m. Estimated historical pore pressure...
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Journal Article
Journal: Geophysics
Published: 09 June 2011
Geophysics (2011) 76 (4): Q19-Q27.
... refer to as ghost cavitation. The former one is found to have a steep decreasing amplitude trend with frequency, while the latter has a close to 1/ f attenuation for frequencies above 1 kHz. A thorough understanding of the effects is of significant importance to quantify and estimate any environmental...
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Image
Snapshots of      V  z      at 0.4 s propagating in the semi-infinite <b>cavit</b>...
in > Geophysics
Published: 10 January 2018
Figure 14. Snapshots of V z at 0.4 s propagating in the semi-infinite cavity model with the interval of the z -direction as 8.0 m. Obtained by (a) FDM, (b) LSM for V P = 3000    m / s and ρ = 1500    kg / m 3 , (c) FDM, and (d) LSM for V
Image
Snapshots of      V  z      at 0.4 s propagating in the semi-infinite <b>cavit</b>...
in > Geophysics
Published: 10 January 2018
Figure 15. Snapshots of V z at 0.4 s propagating in the semi-infinite cavity model with the interval of the z -direction as 2.0 m. Obtained by (a) FDM, (b) LSM for V P = 3000    m / s and ρ = 1500    kg / m 3 , (c) FDM, and (d) LSM for V
Image
Schematic illustration (not to scale) showing the relation of primary <b>cavit</b>...
Published: 01 March 2016
Fig. 13. Schematic illustration (not to scale) showing the relation of primary cavities to secondary cavities. ( a ) A typical blast at a lower initial pressure and/or deeper blast depth. ( b ) A typical blast at higher initial pressure and/or shallower blast depth. The continuous-line arrows repr
Image
Middle Miocene microkarst in Watson Quarry outcrop showing microkarst <b>cavit</b>...
Published: 01 September 2012
Fig. 3 Middle Miocene microkarst in Watson Quarry outcrop showing microkarst cavities. The cavities have digitate boundaries and are filled with micritic sediment, which is in stark contrast to the surrounding Nullarbor Limestone grainstone lithology.
Image
Expanded view of temperature-resolved 2D-XRD patterns measured with a <b>cavit</b>...
Published: 01 May 2010
F igure 7. Expanded view of temperature-resolved 2D-XRD patterns measured with a cavity mount under different P H 2 O conditions, illustrating the formation of x-metamesolite (circles). The pattern shown as a thick line represents data measured at 300 °C and it includes reflections of disorde