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Hydrostatic equilibrium
About: Hydrostatic equilibrium is a research topic. Over the lifetime, 2451 publications have been published within this topic receiving 62172 citations.
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TL;DR: In this paper, a non-linear method for the calculation of the hydrostatic force, submerged volume, and center of buoyancy was proposed and validated by laboratory experiments using a panelization of the hull geometry.
1 citations
01 May 2000
TL;DR: In this article, the authors used the density distribution in the PREM to study the dynamical flattening of the Earth and found that the density redistribution of the lower mantle, located under Earth's surface from 671 km to 2891 km, makes the value of dynamical curvature easily coincide with its observed one.
Abstract: The observed data of the Earth's gravitational field indicate that the figure of external equipotial surface of the Earth differs from the value given by the solution of hydrostatic equilibrium equation. Besides, the dynamical flattening of the Earth, as observed by geodetic techniques, is different by about 1 per cent from the value associated with the PREM density profile with hydrostatic equilibrium. Based on the theory of figure of the planets, the internal equipotential surface of a self gravitating, rotating mass in hydrostatic equilibrium is coincident with the equal density surface everywhere within the celestial body. Once the density distribution ρ(r) is known, one can obtain the profile of the flattening e(r) in the planetary interior. In this paper using the density distribution in the PREM, the author discusses two factors affecting the dynamical flattening of the Earth. From the calculated results the author comes to the following conclusions: (1)The density redistribution of the lower mantle, located under Earth's surface from 671 km to 2891 km, makes the value of dynamical flattening easily coincide with its observed one. (2)If the dynamical shape of the actual Earth represents the hydrostatic figure from a past geological age, it is the angular velocity from 9. 8×10 6 years ago that matches the Earth's dynamical flattening. This inference is difficult to confirm observationally, therefore nobody can confirm or deny it. However, it appears that the nonhydrostatic components of the Earth's shape not only relates to the present physical state within the Earth, but also reflects the effects of some factors during the whole history of its evolution. This result calls our attention to making careful investigation on the tide evolution of the Earth moon system, and checking whether or not some long term variation exists in Earth's physical parameters. (3) The results of the investigation with respect to the Earth's dynamical flattening can be used for reference in the domain of figure theory for other terrestrial planets. In particular, the influences of density redistribution within various interior zones on the Earth's flattening are different from each other. This conclusion might be used to study in the future the interior structure of Mars.
1 citations
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TL;DR: In this paper , Nishiyama et al. examined syntectonic quartz veins to constrain temporal variations in the recurrence intervals between slow slip and tremor events and found that large decreases in porefluid pressure occurred during faulting, and these variations drove increases in supersaturation and rapid quartz precipitation.
Abstract: Abstract A recent paper by Nishiyama et al. (Earth, Planets, and Space 73:126) examined syntectonic quartz veins to constrain temporal variations in the recurrence intervals between slow slip and tremor events. The authors claim that by examining the liquid-volume fraction of syntectonic fluid inclusions in the veins, that they can accurately reconstruct pore-fluid pressures (and variations therein) that were operative during faulting at ~ 15 km depth in an exhumed subduction melange. From these observations, the authors infer that large (from lithostatic to hydrostatic) decreases in pore-fluid pressure occurred during faulting, and that these variations drove increases in supersaturation and rapid quartz precipitation over time scales consistent with the repeat times of seismologically observed slow slip and tremor events. Here, I show that Nishiyama et al.’s analysis neglects reasonable uncertainties in pore-fluid pressure reconstruction. When those uncertainties are included, the Nishiyama et al.’s results become ambiguous as to whether any variation in pore-fluid pressure during vein formation occurred at all, negating the validity of many of the subsequent conclusions. Graphical Abstract
1 citations
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TL;DR: In this article , the authors proposed closed-form equations to calculate the bisymmetric dry and wet hydrostatic collapse strength of flexible pipes with imperfections, based on the classic Timoshenko's equation.
1 citations