A5071632213- Rock Mechanics and Modeling
- Seismic Imaging and Inversion Techniques
- earthquake and tectonic studies
- Seismic Waves and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Drilling and Well Engineering
- Geotechnical and Geomechanical Engineering
- Marine Sponges and Natural Products
- Geotechnical Engineering and Underground Structures
- Geophysical Methods and Applications
- Tunneling and Rock Mechanics
- Seismology and Earthquake Studies
- Grouting, Rheology, and Soil Mechanics
- Microbial Natural Products and Biosynthesis
- High-pressure geophysics and materials
- CO2 Sequestration and Geologic Interactions
- Surface Modification and Superhydrophobicity
- Groundwater flow and contamination studies
- High-Velocity Impact and Material Behavior
- Landslides and related hazards
- Seismic Performance and Analysis
- Gear and Bearing Dynamics Analysis
- Microstructure and Mechanical Properties of Steels
- Fire dynamics and safety research
- Genomics and Phylogenetic Studies
University of Calgary
2021-2024
Zhejiang Normal University
2024
Shandong University
2023-2024
Lawrence Livermore National Laboratory
2023-2024
Tongji University
2023
Jilin University
2023
Xi'an Jiaotong University
2023
Pennsylvania State University
2016-2022
Park University
2022
Ocean University of China
2016-2022
Abstract There is wide concern that fluid injection in the subsurface, such as for stimulation of shale reservoirs or geological CO 2 sequestration (GCS), has potential to induce seismicity may change reservoir permeability due fault slip. However, impact induced on fracture evolution remains unclear spectrum modes reactivation (e.g., stable versus unstable). As controlled by frictional response fractures, we explore friction‐stability‐permeability relationships through concurrent...
Microbially-induced calcium carbonate precipitation (MICP) can enhance the stiffness and bulk strength of sand aggregates via cementation. This study explores mechanical silica with different particle morphologies sizes following MICP treatment. Specifically, unconfined uniaxial compressive (UCS) MICP-treated spherical, near-spherical, angular are measured for four separate size fractions (18–25, 25–40, 40–60, 60–80 mesh). Scanning electron microscope (SEM) imaging is performed on...
This review presents a comprehensive overview of recent advances in the discovery methodologies, new structures, bioactivities, and unique biosynthetic logics myxobacterial natural products reported from January 2017 to November 2023.
Abstract Massive fluid injection into the subsurface can induce microearthquakes by reactivating preexisting faults or fractures as seismic aseismic slip. Such shear deformations may result in different modes of permeability evolution. Previous experimental studies have explored frictional stability‐permeability relationships carbonate‐rich and phyllosilicate‐rich samples under shear, suggesting that friction‐permeability relationship be primarily controlled fracture minerals. We examine...
Myxobacteria are fascinating prokaryotes featuring a potent capacity for producing wealth of bioactive molecules with intricate chemical topology as well intriguing enzymology, and thus it is critical to developing an efficient pipeline bioprospecting. Herein, we construct the database MyxoDB, first public compendium solely dedicated myxobacteria, which enabled us provide overview structural diversity taxonomic distribution known myxobacterial natural products. Moreover, demonstrated that...
Subsurface fluid injections can disturb the effective stress regime by elevating pore pressure and potentially reactivate faults fractures. Laboratory studies indicate that fracture rheology permeability in such reactivation events are linked to roughness of surfaces. In this study, we construct numerical models using discrete element method (DEM) explore influence surface on shear strength, slip stability, evolution during events. For each simulation, a pair analog rock coupons...
Abstract Understanding mechanisms controlling fluid injection-triggered seismicity is key in defining strategies to ameliorate it. Recent triggered events (e.g. Pohang, Mw 5.5) have exceeded predictions of average energy release by a factor >1000x, necessitating robust methodologies both define critical antecedent conditions and thereby constrain anticipated event size. We maximum magnitudes resulting from triggering as function pre-existing stresses injection volume. Fluid experiments on...
Induced seismicity related to industrial operations including carbon storage, geothermal energy, hydraulic fracturing or wastewater disposal has become increasingly common over the last 15 years. To continue these with minimal impact on sites, populations and economic conditions of operation, it is crucial better understand mechanisms that control induced earthquakes occurrence in both space time.This research focuses enhancing statistical forecasts (using seismogenic index model ETAS),...
Abstract We explore the impact of phyllosilicate (weak but velocity strengthening) in a majority tectosilicate (strong weakening) matrix on bulk shear strength and slip stability faults. Numerical simple experiments using distinct element model (DEM) are conducted both uniform mixtures quartz talc analogs textured consisting layer embedded matrix. The mechanical response particles is represented by linear elastic contact with slip‐weakening constitutive relation representing essence...
Sporosarcina pasteurii (ATCC 11859) is a nitrogen-circulating bacterium capable of precipitating calcium carbonate given source and urea. This microbially induced precipitation (MICP) able to infill inter-granular porosity act as biological clogging agent, thus having wide potential application in strengthening coastal foundations, preventing erosion by seas rivers reducing sand liquefaction areas. A successful MICP requires the understanding primary parameters that influence mediated...
Abstract Cyclic growth and decay of permeability in fractures is explored during repeated reactivation repose saw‐cut Green River shale. These slide‐hold‐slide experiments are supported by measurements fracture normal deformation optical surface profilometry. Overall, we observe continuous (holds) significant enhancement slow (slide). The accompanied fault compaction. Both hydraulic aperture change (Δ b h ) measured compaction s consistent with time‐dependent power law closure a exponent...
In recent years, Distributed Acoustic Sensing (DAS) deployed in deviated wells has been increasingly used for microseismic monitoring. DAS can provide observations of wavefields with high spatial resolution and wide aperture, at the cost unusually large data volumes compared conventional downhole To tackle this big-data challenge, we have developed key elements a processing workflow that is assisted by machine learning techniques. We trained convolutional neural network (CNN) event detection...
Microgrooved thin PLGA film (≈30 μm) is successfully fabricated on a Teflon mold, which could be readily peeled off and used for the construction of biomimetic cardiac patch. The contraction it studied with optical mapping transmembrane action potential. Our results suggest that steady‐state easily established under regular electrical stimuli. Besides, patch recapitulates anisotropic electrophysiological feature native tissue much more refractory to premature stimuli than random one...
Abstract Objective To evaluate the financial burden of oesophageal cancer under protection new Rural Cooperative Medical Scheme ( NCMS ) and to provide evidence suggestions policymakers in a high‐incidence region China. Methods We analysed inpatient claim data for cancer, gastric colorectal from 1 January 31 December 2013. The were extracted management system Hua County, Henan Province, typical high‐risk Cancer‐specific health economic indicators calculated local . Results total cost was...
We explore the evolution of friction and permeability a propped fracture under shear. examine effects normal stress, proppant thickness, size, wall texture on frictional transport response packs confined between planar surfaces. The proppant-absent proppant-filled fractures show different strength. For with proppants, is mainly controlled by stress thickness. depth shearing-concurrent striations surfaces suggests that magnitude embedment applied stress. Under high reduced implies shear slip...
Marine organism-derived secondary metabolites are promising potential sources for discovering environmentally safe antifouling agents. In present study, 55 marine and their synthesized derivatives were tested evaluated activities security. These compounds include 44 natural products isolated from invertebrates symbiotic microorganisms collected the South China Sea 11 structural modified derived compounds. The metabolites, covering phenyl ether derivatives, terpenoids, 9, 11-secosteroids,...
Three new 2,5-diketopiperazines, speramide C ( 1 ), 3,21- epi -taichunamide F 2 and 2- -amoenamide 3 along with four known analogs 4 – 7 were obtained from the sponge-derived fungus Aspergillus sclerotiorum GDST-2013-0501 collected South China Sea. The chemical structures of compounds elucidated by analyzing NMR MS spectroscopy data, their absolute configurations determined electronic circular dichroism (ECD) calculations. Compound represents first prenylated indole alkaloid an ethylene...
Hydraulic fracturing is crucial for enhancing hydrocarbon production from unconventional reservoirs. The characterization of fracture geometry and propagation has significant value in understanding reservoir response designing more efficient completions. Distributed acoustic sensing (DAS) a rapidly developing technology that can be used this purpose because it provides wide-aperture observations microseismic wavefields contain direct P S arrivals as well converted reflected waves. In...
Distributed acoustic sensing (DAS) is a rapidly developing technology that can be used for characterizing the geometry and propagation of hydraulic fractures. DAS provides observations microseismic wavefields with high spatial resolution, which contain direct P- S-arrivals as well converted reflected signals. In addition to traditional approaches event location source mechanism analysis, recordings image induced fractures using reflections. The reflections may generated by from earlier...