Results 11 to 20 of about 2,592,144 (295)

Experimental studies of instability process and energy evolution of tunnels under true triaxial stresses: The role of pre-existed flaws

Frontiers in Earth Science, 2023
In the natural geological environment, there are many joints, faults and cavities. These natural defects will have an impact on the stability of tunnels.
Binglei Li, Jianing Li, Hongyuan Hu, Jinrui Gong, Tao Luo   +4 more
doaj   +1 more source

Experimental and numerical research of crack propagation process and energy dissipation law of grouting specimens under radial impact load

Frontiers in Earth Science, 2023
Different air pressures are used to conduct an impact test based on the split Hopkinson pressure bar (SHPB) test system to study the crack evolution process and energy dissipation law of the cemented rock under impact load.
Chang-Xing Zhu, Jia-Xin Sun, Jian Gong, Feng-E Wang   +3 more
doaj   +1 more source

Dynamic equations for nonassociated gas accumulation

Petroleum Exploration and Development, 2008
Nonassociated gas can be classified as conventional gas accumulation with displacement migration, source-contacting gas accumulation with piston-type migration, and shale gas accumulation with the displacement and piston-type migrations.
Jin-chuan ZHANG, Xuan TANG, Rui-kang BIAN, Bo XU, Hui XUE, Hai-kuan NIE, Sheng-ling JIANG   +6 more
doaj   +1 more source

Numerical Modeling on the Fracturing and Energy Evolution of Large Deep Underground Openings Subjected to Dynamic Disturbance

Energies, 2020
The exploitation of deep resources is necessary for human development. At the same time, high-stress environments that are deep underground bring about great challenges vis-à-vis resource exploitation.
Chun Yang, Keping Zhou, Zhichao Li, Xin Xiong, Yun Lin, Zengwu Luo   +5 more
doaj   +1 more source

Energy [R]evolution 2010—a sustainable world energy outlook [PDF]

Energy Efficiency, 2010
The Energy [R]evolution 2010 scenario is an update of the Energy [R]evolution scenarios published in 2007 and 2008. It takes up recent trends in global energy demand and production and analyses to which extent this affects chances for achieving climate protection targets.
Teske, S., Pregger, T., Simon, S., Naegler, T., Graus, W.H.J., Lins, C.   +5 more
openaire   +3 more sources

Damage Characteristics and Energy Evolution of Bituminous Sandstones under Different Cyclic Amplitudes

Applied Sciences, 2023
In many underground engineering projects, rocks are often subjected to cyclic loading and unloading, such as repeated excavation of roadway surrounding rock, which will lead to damage to underground rocks, and the energy of rocks also changes. Therefore,
Xiaoyu Lu, Ruipeng Qin, Chunliang Dong, Chaotao Fan   +3 more
doaj   +1 more source

Zero energy resonance and the logarithmically slow decay of unstable multilevel systems [PDF]

, 2006
The long time behavior of the reduced time evolution operator for unstable multilevel systems is studied based on the N-level Friedrichs model in the presence of a zero energy resonance.The latter means the divergence of the resolvent at zero energy ...
Khalfin L. A., Khalfin L. A., Manabu Miyamoto, Nakazato H., Reed M.   +4 more
core   +2 more sources

Analysis of Energy Evolution Characteristics of Salt Rock Under Different Loading Rates

Frontiers in Earth Science, 2022
The existing uniaxial compression test results of salt rock under different loading rates are used to study its energy evolution characteristics during deformation and failure in this study. First of all, the influence of loading rate on the total energy
J. B. Wang, J. B. Wang, X. Liu, X. Liu, Q. Zhang, Q. Zhang, Z. P. Song, Z. P. Song   +7 more
doaj   +1 more source

BATSE Observations of Gamma-Ray Burst Spectra. IV. Time-Resolved High-Energy Spectroscopy [PDF]

, 1997
We report on the temporal behavior of the high-energy power law continuum component of gamma-ray burst spectra with data obtained by the Burst and Transient Source Experiment.
C. A. Meegan, Cavallo G., David L. Band, Geoffrey N. Pendleton, Hanlon L. O., James L. Matteson, Michael S. Briggs, Rees M. J., Robert D. Preece, Robert S. Mallozzi, William S. Paciesas   +10 more
core   +2 more sources

Mechanical characteristics and energy evolution law of sandstone failure process under post-peak cold and heat cycle

Meikuang Anquan, 2023
In coal fire control, grouting/water extinguishing is often repeated for reasons such as re-ignition. The surrounding rock undergoes repeated heating and water cooling, resulting in strength reduction and damage, and collapse and cracks on the extended ...
QI Huaiyuan, WANG Jianwei
doaj   +1 more source