Results 71 to 80 of about 31,992 (227)

Optimal mud pressure design using nonlinear failure criteria for wellbores in shaley sedimentary reservoir

Deep Underground Science and Engineering, EarlyView.
The present study uses the Modified Mohr‐Coulomb true‐triaxial failure criterion (MMC_TT), which predicts the strength of rock better than the MGC criterion in laboratory true‐triaxial tests to overcome the limitations. Moreover, based on the data from previously published five vertical wells in the Krishna‐Godavari basin (K‐G basin), an empirical ...
Ravindra K. Burnwal, Aditya Singh
wiley   +1 more source

Models of cuspy triaxial stellar systems. II. Regular orbits [PDF]

, 2012
In the first paper of this series we used the N--body method to build a dozen cuspy (gamma ~ 1) triaxial models of stellar systems, and we showed that they were highly stable over time intervals of the order of a Hubble time, even though they had very ...
Muzzio, J. C., Navone, H. D., Zorzi, A. F.   +2 more
core   +4 more sources

Strain‐based modeling and analysis for rock blasting and geomechanics applications

Deep Underground Science and Engineering, EarlyView.
This paper introduces a novel strain‐based modeling approach for blasting and geomechanical applications, using measurable variables like particle velocity, strain, and displacement. By bypassing complex constitutive relations, strain‐based models capture critical blasting trends and full‐blast design parameters with minimal calibration.
Ruilin Yang
wiley   +1 more source

Uniformly rotating, axisymmetric and triaxial quark stars in general relativity

, 2017
Quasi-equilibrium models of uniformly rotating axisymmetric and triaxial quark stars are computed in general relativistic gravity scenario. The Isenberg-Wilson-Mathews (IWM) formulation is employed and the Compact Object CALculator (COCAL) code is ...
Rezzolla, Luciano, Tsokaros, Antonios, Uryū, Kōji, Xu, Renxin, Zhou, Enping   +4 more
core   +1 more source

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

Deep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang, Maohui Wang, Ning Wang, Yixin Shen, Xuzhen He   +4 more
wiley   +1 more source

Phase space transport in cuspy triaxial potentials: Can they be used to construct self-consistent equilibria?

, 2000
(Abridged) This paper studies chaotic orbit ensembles evolved in triaxial generalisations of the Dehnen potential which have been proposed to model ellipticals with a strong density cusp that manifest significant deviations from axisymmetry. Allowance is
Arnold, Athanassoula, Bender, Binney, Byun, Chandrasekhar, Christos Siopis, Contopoulos, De Zeeuw, Dehnen, Gebhardt, Grassberger, Griner, Habib, Habib, Habib, Henry E. Kandrup, Häfner, Ipser, Kandrup, Kandrup, Kandrup, Kandrup, Kandrup, Kandrup, Kandrup, Kaufmann, Kormendy, Kormendy, Kormendy, Lauer, Lichtenberg, Lieberman, Lindenberg, Louis, Lynden-Bell, MacKay, Mahon, Mendes de Oliveira, Merritt, Merritt, Merritt, Merritt, Merritt, Moller, Perez, Pogorelov, Rechester, Schwarzschild, Schwarzschild, Sridhar, Udry, Vandervoort, Zepf, Zhao   +54 more
core   +3 more sources

Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing

Deep Underground Science and Engineering, EarlyView.
Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley   +1 more source

Triaxial Compression Performance Research of Steel Slag Concrete on the Unified Strength Theory

Applied Sciences, 2020
To better explore the mechanical properties of steel slag concrete (SSC) under triaxial compression, true triaxial tests were performed on SSC with three replacement ratios (30%, 70%, 100%) by a servo-controlled setup (TAWZ-5000/3000).
Zhiheng Deng, Jingkai Zhou, Beiquan Chen, Xiaoyan Wen, Bing Liu   +4 more
doaj   +1 more source

The Centers of Early-Type Galaxies with HST III: Non-Parametric Recovery of Stellar Luminosity Distributions

, 1996
We have non-parametrically determined the luminosity density profiles and their logarithmic slopes for 42 early-type galaxies observed with HST. Assuming that the isodensity contours are spheroidal, then the luminosity density is uniquely determined from
Ajhar, Edward, Byun, Yong-Ik, Dressler, Alan, Faber, Sandra, Gebhardt, Karl, Grillmair, Carl, Kormendy, John, Lauer, Tod, Richstone, Douglas, Tremaine, Scott   +9 more
core   +1 more source

The Dependence of Galaxy Shape on Luminosity and Surface Brightness Profile [PDF]

, 2005
For a sample of 96,951 galaxies from the Sloan Digital Sky Survey Data Release 3, we study the distribution of apparent axis ratios as a function of r-band absolute magnitude and surface brightness profile type.
Abramson I. S., Barbara S. Ryden, Benacchio L., Binney J., de Vaucouleurs G., Fasano G., Garijo A., Gerhard O. E., Huizinga J. E., Lambas D. G., R. Anthony Vincent, Vio R.   +11 more
core   +3 more sources