Results 191 to 200 of about 3,841 (276)

Rake angle optimization for balanced efficiency and durability in PDC cutter cutting granite interaction via infrared thermal dynamics and fragmentation mechanism. [PDF]

Sci Rep
He X, Zheng B, Luo Z, Hu P, Yang Y, Yin G.   +5 more
europepmc   +1 more source

Mechanism of “seesaw‐type” rock burst in coal seam mining beneath mountainous areas

Deep Underground Science and Engineering, EarlyView.
This study reveals the mechanism of “seesaw‐type” rock bursts during coal mining beneath mountainous areas. The advancing working face induces nonuniform fracturing of the overburden. The detached mountain mass then undergoes a seesaw‐type rotational movement around a shifting pivot, driving the primary fracture through a characteristic “open‐close ...
Chao Zhou, Xueqiu He, Zhenlei Li, Ping Wang, Dazhao Song, Fuxing Jiang, Shan Yin, Anliang Lü, Menghan Wei, Taoping Zhong   +9 more
wiley   +1 more source

Research on the mechanism of multiple key strata controlling overburden movement and their classification in bedrock gully. [PDF]

Sci Rep
Ma Z, Chai J, Zhang D, Yang J.
europepmc   +1 more source

Exponentially‐constrained Gaussian mixture model for quantifying vertical development of water‐conducting fracture zones in lithologically stratified mining roofs

Deep Underground Science and Engineering, EarlyView.
This study proposes an exponentially‐constrained Gaussian mixture model (EcGMM) to quantify vertical fracture heterogeneity in stratified roof strata. The model integrates a piecewise exponential decay term capturing global stress dissipation with Gaussian components representing localized fracture intensification at lithological interfaces.
Huiqing Yuan, Zhimin Xu, Weixiao Chen, Chenghang Zhang, Shijie Xiong, Yajun Sun   +5 more
wiley   +1 more source

Numerical investigation on the tunneling efficiency of TBM considering the argillization effect based on the energy evolution. [PDF]

Sci Rep
Lu M, Ruan H, Liu B, Gao H, Chen H, Zeng Y, Bao S, Chen X, Wan X, Tong B, Li B.   +10 more
europepmc   +1 more source

World's fastest 10 000‐m breakthrough: The XY‐22 well redefines deep‐earth access in the Tarim Basin

Deep Underground Science and Engineering, EarlyView.
The Tarim Basin in northwestern China hosts one of the world's deepest petroleum systems, exemplified by the XY‐22 ultra‐deep well (bottom depth: 11 116 m; ~220°C, ~145 MPa). This study integrates tectonic mapping, geological cross‐sections, ultraviolet fluorescence microscopy, and optical photothermal infrared (OPTIR) spectroscopy to characterize ...
Qingwen Tan, Fangkai Liu, Sen Zhu, Guangyou Zhu, Haiping Huang   +4 more
wiley   +1 more source

Study on fault vibration characteristics of shield cutters based on FEM-MBD. [PDF]

Sci Rep
Chen J, Zhang P, Li S, Qiu S, Zhang T.
europepmc   +1 more source

Feeling Better Before, Not After: An Ecological Momentary Assessment of Affect Around Exercise in Women With Eating Disorders

International Journal of Eating Disorders, EarlyView.
ABSTRACT Objective Maladaptive exercise includes excessive, compulsive, or compensatory exercise and is a common eating‐disorder (ED) symptom associated with increased severity, slower rates‐of‐recovery, and faster rates‐of‐relapse. Affect‐regulation theories posit that maladaptive exercise functions to reduce high negative affect (NA), although ...
Danielle A. N. Chapa, Kelsie T. Forbush, Yiyang Chen, Courtney E. Costain, Samiya I. Rasheed   +4 more
wiley   +1 more source

Generation Mechanism and LWD-Based Identification Methods for Highly Fractured Shale: A Case Study of Wufeng-Longmaxi Formations, Sichuan Basin. [PDF]

ACS Omega
Qiu X, Shi W, He C, Wang T, He H, Tan P, Ye X, Wei W, Feng X, Jiao E.   +9 more
europepmc   +1 more source

Low‐Temperature in Situ Upgrading of Ultra‐Deep Heavy Oil Using Ni–Ce/MOF–OTf Superacid Catalysts to Enhance Energy Utilization and Sustainability

EcoEnergy, EarlyView.
A triflate‐functionalized Ni–Ce/MOF–OTf superacid enables low‐temperature (∼140°C) in situ upgrading of ultra‐deep heavy oil. It reduces viscosity by 92.11% in 12 h, maintains activity over cycles, and delivers 90.25% recovery with a lower carbon footprint by selective bond cleavage. ABSTRACT Ultra‐deep heavy oil is an important unconventional resource,
Li Wang, Ji‐Xiang Guo, Qiming Huang, Kunpeng Li, Chi Li, Yajie Wu   +5 more
wiley   +1 more source