Results 61 to 70 of about 27,123 (217)

Stellar Bar Evolution in Cuspy and Flat-Cored Triaxial CDM Halos

, 2005
We analyze the evolution of stellar bars in galactic disks in mildly triaxial flat-core and cuspy CDM halos. We use tailored simulations of rigid and live halos which include the feedback from disk/bar onto the halo in order to test the work by El-Zant &
Aarseth S. J., Cole S., Ingo Berentzen, Isaac Shlosman, Miyamoto M., Pfenniger D., Pfenniger D., Shardha Jogee, Sparke L. S., Tormen G.   +9 more
core   +1 more source

Triaxial Black-Hole Nuclei [PDF]

, 2001
We demonstrate that the nuclei of galaxies containing supermassive black holes can be triaxial in shape. Schwarzschild's method was first used to construct self-consistent orbital superpositions representing nuclei with axis ratios of 1:0.79:0.5 and ...
David Merritt, Gerhard O. E., Gerhard O. E., Kormendy J., M. Y. Poon   +4 more
core   +2 more sources

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

Energy evolution and damage analysis of true triaxial cyclic loading and unloading of sandstone at different rates

Meitan xuebao
To investigate the effects of different rates on the energy and damage evolution of sandstone during true triaxial cyclic loading and unloading damage, the true triaxial compression test, true triaxial primary loading and unloading test, and true ...
Qihang ZHANG, Xiangrui MENG, Guangming ZHAO, Wensong XU, Chongyan LIU, Zhixi LIU, Xukun WU, Minjie QI   +7 more
doaj   +1 more source

Experimental Investigation on the Deformation, Strength, and Acoustic Emission Characteristics of Sandstone under True Triaxial Compression

Advances in Materials Science and Engineering, 2018
The study of deformation, strength, and other mechanical characteristics of sandstone under true triaxial compression is significant for understanding failure mechanisms in rock and evaluating the stability of underground structures.
Zhaolin Li, Lianguo Wang, Yinlong Lu, Wenshuai Li, Kai Wang   +4 more
doaj   +1 more source

Exponential true triaxial strength criteria for rock

Yantu gongcheng xuebao, 2018
The rock strength is the premise and foundation for stability evaluation of rock engineering and optimization design of structures. Based on the true triaxial test results, the evolution of rock strength are analyzed: (1) The rock strength increases with
ZHANG Qiang , LI Cheng , GUO Qiang , MIN Ming , JIANG Bin-song , WANG Yan-ning
doaj   +1 more source

True triaxial physics simulations and process tests of hydraulic fracturing in the Da’anzhai section of the Sichuan Basin tight oil reservoir

Frontiers in Energy Research, 2023
The limestone reservoir of the Da’anzhai section is the main production layer of Jurassic tight oil in central Sichuan, with tight and strongly heterogeneous reservoir rocks. In the early stages, small-scale plug removal and acidification techniques were
Song Li, Song Li, Yu Fan, Yu Fan, Yang Wang, Yuanshou Zhao, Zefei Lv, Zeng Ji, Weihua Chen, Jian Min, Jian Min   +10 more
doaj   +1 more source

Testing linear-theory predictions of galaxy formation [PDF]

, 1999
The angular momentum of galaxies is routinely ascribed to a process of tidal torques acting during the early stages of gravitational collapse, and is predicted from the initial mass distribution using second-order perturbation theory and the Zel'dovich ...
Kamionkowski, Marc, Sugerman, Ben, Summers, F. J.   +2 more
core   +3 more sources

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source

Mechanical response of coal rock mass with different proportions under true triaxial load

Meikuang Anquan, 2021
In order to explore the mechanical response law of different coal rock proportion combinations under true triaxial load, the cube specimens with different combination methods were prepared.
DONG Hao
doaj   +1 more source