Results 21 to 30 of about 777,304 (305)

An Empirical Study Comparing Unobtrusive Physiological Sensors for Stress Detection in Computer Work. [PDF]

open access: yes, 2019
Several unobtrusive sensors have been tested in studies to capture physiological reactions to stress in workplace settings. Lab studies tend to focus on assessing sensors during a specific computer task, while in situ studies tend to offer a generalized ...
Akbar, Fatema   +3 more
core   +2 more sources

Research on variation law of secondary stress on working face of Guotun Coal Mine

open access: yesGong-kuang zidonghua, 2017
For deformation and failure situation of roadway on 1304 working face of Guotun Coal Mine, the secondary stress of the working face was measured. Three monitoring drills were constructed at one point of the roadway on 1304 working face, and four HI ...
JIANG Zilong, CHEN Wenlong, LIU Youjian
doaj   +1 more source

Comparison of predicted failure area around the boreholes in the strike-slip faulting stress regime with Hoek-Brown and Fairhurst generalized criteria

open access: yesJournal of Civil Engineering and Management, 2021
Breakout is a shear failure due to compression that forms around the borehole due to stress concentration. In this paper, the breakout theory model is investigated by combining the equilibrium elasticity equations of stress around the borehole with two ...
Ali Lakirouhani   +3 more
doaj   +1 more source

Three‐dimensional simulation of the acidizing process under different influencing factors in fractured carbonate reservoirs

open access: yesEnergy Science & Engineering, 2023
Matrix acidizing is widely used to enhance oil/gas production in the exploitation of carbonate reservoirs. In this work, a three‐dimensional (3D) hydro‐chemical‐thermal (H‐C‐T)‐coupled model was presented to improve the understanding of the acidizing ...
Anbang Guo   +4 more
doaj   +1 more source

In Situ Stress Distribution in Cretaceous Ultra-Deep Gas Field From 1D Mechanical Earth Model and 3D Heterogeneous Geomechanical Model, Kuqa Depression, Tarim Basin, NW China

open access: yesFrontiers in Earth Science, 2022
The Kuqa Depression boasts rich cretaceous ultra-deep hydrocarbon resources. However, it is in complex geological conditions. At present, sufficient understandings on the in situ stress distribution and influencing factors are lacking, which restricts ...
Ke Xu   +11 more
doaj   +1 more source

Inversion Analysis of the In Situ Stress Field around Underground Caverns Based on Particle Swarm Optimization Optimized Back Propagation Neural Network

open access: yesApplied Sciences, 2023
The in situ stress distribution is one of the driving factors for the design and construction of underground engineering. Numerical analysis methods based on artificial neural networks are the most common and effective methods for in situ stress ...
Hong-Chuan Yan   +7 more
doaj   +1 more source

Oxidative Stress Inhibits Calpain Activity in Situ [PDF]

open access: yesJournal of Biological Chemistry, 1998
In this study, the effects of oxidative stress on calpain-mediated proteolysis and calpain I autolysis in situ were examined. Calpain activity was stimulated in SH-SY5Y human neuroblastoma cells with the calcium ionophore, ionomycin. Calpain-mediated proteolysis of the membrane-permeable fluorescent substrate N-succinyl-L-leucyl-L-leucyl-L-valyl-L ...
R P, Guttmann, G V, Johnson
openaire   +2 more sources

Real-time depth sectioning: Isolating the effect of stress on structure development in pressure-driven flow [PDF]

open access: yes, 2009
Transient structure development at a specific distance from the channel wall in a pressure-driven flow is obtained from a set of real-time measurements that integrate contributions throughout the thickness of a rectangular channel. This “depth sectioning
Derek W. Thurman   +9 more
core   +2 more sources

In situ stress characteristics of the NE Sichuan basin based on acoustic emission test and imaging logging

open access: yesSN Applied Sciences, 2021
This study presents the distribution rule of in situ stress in the northeast Sichuan basin and its relationship with fracture. Sixty-seven sets of core samples of 21 Wells from the terrigenous clastic rock formation (Shaximiao, Qianfoya, Xujiahe) and ...
Xinxin Fang, Hong Feng
doaj   +1 more source

Mechanical mechanism of in situ stress ratio limit and its evolution simulation

open access: yesFrontiers in Earth Science, 2022
In situ stress is a natural phenomenon. According to the Mohr–Coulomb criterion, it is found that when the ratio of principal stress (the ratio of maximum principal stress to minimum principal stress) of crustal rock mass in a certain environment exceeds
Yifei Chen   +6 more
doaj   +1 more source

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