Results 31 to 40 of about 5,144,321 (345)

Instability of black hole formation under small pressure perturbations [PDF]

, 2012
We investigate here the spectrum of gravitational collapse endstates when arbitrarily small perfect fluid pressures are introduced in the classic black hole formation scenario as described by Oppenheimer, Snyder and Datt (OSD) [1].
A Ori, A Ori, A Ori, B Waugh, C Gundlach, D Christodoulou, Daniele Malafarina, DM Eardley, E Sorkin, G Magli, G Magli, H Bondi, I Bombaci, JF Villas da Rocha, JR Oppenheimer, JR Oppenheimer, M Patil, M Patil, MW Choptuik, MW Choptuik, Pankaj S. Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, PS Joshi, R Giambo, R Giambó, R Giambó, R Goswami, R Penrose, RC Tolman, RPAC Newman, S Datt, SE Woosley, SG Ghosh, SMCV Goncalves, T Foglizzo, T Harada, T Harada, T Harada   +44 more
core   +3 more sources

Pressure-Tuned Collapse of the Mott-Like State in Ca_{n+1}Ru_nO_{3n+1} (n=1,2): Raman Spectroscopic Studies [PDF]

, 2002
We report a Raman scattering study of the pressure-induced collapse of the Mott-like phases of Ca_3Ru_2O_7 (T_N=56 K) and Ca_2RuO_4 (T_N=110 K). The pressure-dependence of the phonon and two-magnon excitations in these materials indicate: (i) a pressure ...
C. S. Snow, G. Cao, H. Fukazawa, H. L. Liu, J. E. Crow, S. L. Cooper, S. Nakatsuji, S. Nakatsuji, T. M. Rice, V. I. Anisimov, Y. Maeno, Y. Maeno   +11 more
core   +1 more source

Uncertainty Evaluation of Safe Mud Weight Window Utilizing the Reliability Assessment Method

Energies, 2019
Due to the uncertainty of formation properties and improper wellbore stability analysis methods, the input parameters are often uncertain and the required mud weight to prevent wellbore collapse is too large, which might cause an incorrect result ...
Tianshou Ma, Tao Tang, Ping Chen, Chunhe Yang   +3 more
doaj   +1 more source

Gravitationally Collapsing Shells in (2+1) Dimensions [PDF]

, 2006
We study gravitationally collapsing models of pressureless dust, fluids with pressure, and the generalized Chaplygin gas (GCG) shell in (2+1)-dimensional spacetimes.
E. Poisson, H.-S. Tsien, J. E. Chase, John J. Oh, M. Abramowitz, M. Bañados, Robert B. Mann, S. Chaplygin, T. von Karman, W. Israel   +9 more
core   +2 more sources

Study and application on influence mechanism of instability and collapse of drainage borehole on gas drainage

Meitan xuebao, 2023
The instability and collapse of drainage boreholes is one of the key problems that hinder the efficient extraction of coal-bed methane (CBM). In order to solve the problem of instability and collapse of extraction boreholes in soft coal seams, based on ...
Xuebo ZHANG, Hao WANG, Ming YANG, Pan WANG, Linxiu HAN   +4 more
doaj   +1 more source

Local Buckling Characteristics of Stainless-Steel Polypropylene Deep-Sea Sandwich Pipe under Axial Tension and External Pressure

Energies, 2021
In this paper, the effects of different loading paths of axial tension and external pressure on the collapse pressure of sandwich tubes are studied by experiments and finite element models. The difference of the two loading paths is investigated.
Jianxing Yu, Weipeng Xu, Nianzhong Chen, Sixuan Jiang, Shengbo Xu, Mengxue Han   +5 more
doaj   +1 more source

Nonlinear Buckling Finite Element Analysis to Estimate Collapse Pressure of Thick Cylinder under Hydrostatic Pressure [PDF]

한국해양공학회지, 2019
In order to perform a pressure chamber experiment with a circular cylindrical pressure vessel, the dimensions of the cylinder need to be determined in the range of the maximum externally applied pressure of the chamber to create the collapse process.
Jae-Hwan Lee, Byoungjae Park, Hyuek-Jin Choi   +2 more
doaj   +1 more source

Breaking the Rayleigh-Plateau instability limit using thermocavitation within a droplet [PDF]

, 2013
We report on the generation of liquid columns that extend far beyond the traditional Rayleigh-Plateau instability onset. The columns are driven by the acoustic pressure wave emitted after bubble collapse.
Aguilar, G, Banks, N, Korneev, N, Padilla-Martinez, JP, Ramirez-San-Juan, JC, Ramos-Garcia, R   +5 more
core   +1 more source

Rock response characteristics in the area of the hidden collapse column induced by mining

Energy Exploration & Exploitation, 2023
The hidden collapse column has the characteristics of concealment, suddenness and connection with karst water, which pose a serious threat to safe production in coal mines.
Haixiao Lin, Duan Zhang, Xiaogang Wu, Boyang Zhang, Xin Feng   +4 more
doaj   +1 more source

Buckling Analysis of Corroded Pipelines under Combined Axial Force and External Pressure

Metals, 2022
Affected by a complex environment, corrosion is a common defect in steel pipelines. Moreover, steel pipelines are subjected to large axial forces during their installation and operation. Corroded deep-sea steel pipelines are prone to local buckling under
Chunjian Feng, Hang Wu, Xin Li
doaj   +1 more source