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| http://dx.doi.org/10.1136/bmjoq-2019-000774 | DOI Listing |
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Stress transfer law in laboratory hydraulic fracturing experiments.
Sci Rep
July 2024
College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing, 102249, China.
During the true triaxial hydraulic fracturing experiments, the compression stress applied to the specimen surface cannot be transferred to the interior immediately, resulting in inconsistency with in-situ stress conditions. To quantitatively analyze the stress transfer process from the surface to the interior of the specimen, an experimental method for monitoring the inside stress was proposed based on Fiber Bragg Grating (FBG) sensing technique, based on which the true triaxial stress loading experiments were conducted on a concrete-like specimen of 30 cm × 30 cm × 30 cm. The results show that the stresses inside the specimen require a certain loading time to reach the uniform state.
View Article and Find Full Text PDFDynamic stress characterization and instability risk identification using multisource acoustic signals in cut-and-fill stopes.
Sci Rep
July 2024
The School of Resources and Safety Engineering, Central South University, Changsha, 410083, China.
The quantitative characterization of rock mass and stress changes induced by mining activities is crucial for structural stability monitoring and disaster early warning. This paper investigates the time-space-intensity distribution of microseismic sources during the pillar-free large-area continuous extraction. Furthermore, it explores a method involving collaborative evolution patterns of the velocity field and spatial b-value to identify stress and structural changes at the panel stope.
View Article and Find Full Text PDFTuning instability in suspended monolayer 2D materials.
Nat Commun
May 2024
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, 999077, Hong Kong SAR, China.
Monolayer two-dimensional (2D) materials possess excellent in-plane mechanical strength yet extremely low bending stiffness, making them particularly susceptible to instability, which is anticipated to have a substantial impact on their physical functionalities such as 2D-based Micro/Nanoelectromechanical systems (M/NEMS), nanochannels, and proton transport membrane. In this work, we achieve quantitatively tuning instability in suspended 2D materials including monolayer graphene and MoS by employing a push-to-shear strategy. We comprehensively examine the dynamic wrinkling-splitting-smoothing process and find that monolayer 2D materials experience stepwise instabilities along with different recovery processes.
View Article and Find Full Text PDFClinical Validation of Japanese Normal Myocardial Perfusion Imaging Databases Using Semi-conductor Gamma Camera (D-SPECT): Japanese Society of Nuclear Cardiology Working Group Reports.
Ann Nucl Cardiol
August 2022
Department of Functional Imaging and Artificial Intelligence, Kanazawa University, Kanazawa, Japan.
: A working group (WG) of the Japanese Society of Nuclear Cardiology (JSNC) determined Japanese normal databases of myocardial perfusion single-photon emission computed tomography (SPECT) on semi-conductor gamma camera (D-SPECT), and the aim of this study was to validate its clinical utility. : The normal myocardial perfusion SPECT (MPS) databases of Japanese patients in the Tl stress/redistribution protocol (Tl protocol), Tc stress/rest or rest/stress protocol (Tc protocol), and rest Tc/stress Tl simultaneous acquisition dual-isotope protocol (SDI protocol) were created by JSNC WG. The WG collected clinical cases for the Tl protocol (male/female [m/f], 8/8), Tc protocol (m/f, 9/7), and SDI protocol (m/f, 10/10) from WG participating hospitals.
View Article and Find Full Text PDFCemented Paste Backfill Geomechanics at a Narrow-Vein Underhand Cut-and-Fill Mine.
Rock Mech Rock Eng
December 2019
Hecla Mining Company, 6500 N. Mineral Dr., Suite 200, Coeur d'Alene, ID 83815, USA.
Underhand cut-and-fill mining has allowed for the safe extraction of ore in many mines operating in weak rock or highly stressed, rockburst-prone ground conditions. However, the design of safe backfill undercuts is typically based on historical experience at mine operations and on the strength requirements derived from analytical beam equations. In situ measurements in backfill are not commonplace, largely due to challenges associated with instrumenting harsh mining environments.
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