Results 1 to 10 of about 708,486 (305)
Singularities in gravitational collapse with radial pressure [PDF]
General Relativity and Gravitation, 2001 We analyze spherical dust collapse with non-vanishing radial pressure, $\Pi$, and vanishing tangential stresses. Considering a barotropic equation of state, $\Pi=\gamma\rho$, we obtain an analytical solution in closed form---which is exact for $\gamma=-1,
A. Ori +32 more
core +5 more sources
Cosmic censorship and spherical gravitational collapse with tangential pressure [PDF]
Classical and Quantum Gravity, 1997 We study the spherical gravitational collapse of a compact object under the approximation that the radial pressure is identically zero, and the tangential pressure is related to the density by a linear equation of state.
Bondi H +10 more
core +4 more sources
Collapse of critical nematic fluctuations in FeSe under pressure [PDF]
Physical Review Letters, 2018 We report the evolution of the electronic nematic susceptibility in FeSe via Raman scattering as a function of hydrostatic pressure up to 5.8 GPa where the superconducting transition temperature $T_{c}$ reaches its maximum.
Cazayous, Maximilien +10 more
core +8 more sources
Pressure-induced collapse of ferromagnetism in nickel [PDF]
Physical Review B, 2022 Transition metals, Fe, Co and Ni, are the canonical systems for studying the effect of external perturbations on ferromagnetism. Among these, Ni stands out as it undergoes no structural phase transition under pressure. Here we have investigated the long-debated issue of pressure-induced magnetisation drop in Ni from first-principles.
A. Ahad, M. S. Bahramy
openaire +3 more sources
Energies, 2022 The shale oil horizontal wells in the Songliao Basin are affected by a lack of mature theories, technologies and experiences in the direction of wellbore stability. Wellbore collapse may occur, and in severe cases, the wellbore may be scrapped, resulting
Shibin Li +6 more
doaj +1 more source
Journal of Marine Science and Engineering, 2022 The mechanical properties of hydrate-bearing strata in clayey-silt sediments are significantly different from those of either conventional reservoirs or hydrate-bearing sandy sediments, which poses great challenges for wellbore stability analyses.
Xiaofeng Sun +4 more
doaj +1 more source
GRAVITATIONAL COLLAPSE WITH TANGENTIAL PRESSURE [PDF]
International Journal of Modern Physics D, 2011 Using the general formalism for spherical gravitational collapse developed in [P. S. Joshi and I. H. Dwivedi, Class. Quant. Grav.16 (1999) 41; P. S. Joshi and R. Goswami, Phys. Rev. D76 (2007) 084026], we investigate here the final fate of a spherical distribution of a matter cloud, where radial pressures vanish but tangential pressures are nonzero ...
Malafarina, Daniele, Joshi, Pankaj S.
openaire +2 more sources
Frontiers in Physics, 2021 For horizontal wells in Longmaxi Formation, oil-based drilling fluid that soaks for a long time is more likely to cause a wellbore collapse. Therefore, in this paper, the downhole core method of shale formation, in Longmaxi Formation, was adopted. First,
Fan Zhang +5 more
doaj +1 more source
Metals, 2022 To evaluate the collapse pressure of the steel–composite hybrid cylinders under external pressure without excessive computational cost, an analytical formula was derived in this study. The rationality of the derived formula was verified by the comparison
Xinlong Zuo +4 more
doaj +1 more source
Pressure-Induced Collapse of Magnetic Order in Jarosite [PDF]
Physical Review Letters, 2020 We report a pressure-induced phase transition in the frustrated kagom material jarosite at ~45 GPa, which leads to the disappearance of magnetic order. Using a suite of experimental techniques, we characterize the structural, electronic, and magnetic changes in jarosite through this phase transition.
Ryan A. Klein +14 more
openaire +3 more sources