Article
Geochemistry & Geophysics
Junxin Guo, Xiaofei Chen
Summary: We have developed upper and lower bounds for the pressure-dependent elastic wave velocities of unconsolidated cemented sands, taking into consideration variations in cement layer thickness and direct grain contact area with effective pressure. Our findings indicate that the elastic wave velocities increase with effective pressure, while their ratio decreases. Experimental data validate the proposed bounds.
Article
Geochemistry & Geophysics
Hui Qi, Jing Ba, Jose M. Carcione, Lin Zhang
Summary: Understanding the dependence of rock properties on temperature is crucial for heavy oil reservoirs. A dual-porosity temperature-dependent model has been proposed, combining empirical equations for pore fluids with the David-Zimmerman model, to quantitatively describe wave velocities behavior with temperature variation. The study also reveals a change in trends of P- and S-wave velocities when reaching a viscosity threshold.
Article
Chemistry, Physical
Rajarshi Sinha-Roy, Pablo Garcia-Gonzalez, Xochitl Lopez-Lozano, Hans-Christian Weissker
Summary: By comparing the representations of induced charge densities related to surface plasmon resonance and an external static electric field, we can gain an intuitive understanding of the differences between dynamic and static screening.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Geochemistry & Geophysics
Javad Sharifi
Summary: Dynamic-to-static (DTS) modulus conversion is a complex and challenging task in reservoir characterization and seismic geomechanics. A method called DTS modeling is proposed and validated through laboratory tests and simulations. The method considers various influencing factors and can be used for estimating static moduli and verifying dynamic and static moduli values.
Article
Geosciences, Multidisciplinary
Nazanin Nourifard, Maxim Lebedev
Summary: This experiment introduces a new method to simultaneously measure the dynamic and static elastic moduli of reservoir rocks, showing that dynamic moduli can be up to 44% higher than static moduli. Using P-wave velocity allows for estimation of UCS values for sandstones, and dynamic moduli demonstrate greater sensitivity to irreversible deformations compared to static moduli.
JOURNAL OF APPLIED GEOPHYSICS
(2021)
Article
Engineering, Civil
S. K. Tak, M. A. Iqbal
Summary: The finite element computations were used to study the axial compression behavior of thin-walled metallic tubes under quasi-static and dynamic loading conditions in this research. Different geometric shapes of tubes demonstrate varied energy absorption and deformation characteristics under different loading conditions.
THIN-WALLED STRUCTURES
(2021)
Article
Mathematics, Applied
Wei Dong, Shuqing Zhang, Xiaowen Zhang, Wanlu Jiang, Liguo Zhang
Summary: In this study, a novel method, called Reverse Transition Entropy (RTE), is proposed to characterize and identify different complex time series. This method combines RTE with refined composite multi-scale analysis and generalized fractional-order entropy to construct the refined composite multi-scale reverse transition generalized fractional-order complexity-entropy curve (RCMS-RT-GFOCEC). Experimental results demonstrate that the RCMS-RT-GFOCEC method can effectively characterize and identify various complex temporal systems with high accuracy.
Article
Clinical Neurology
Yinhuan Xu, Ruiping Zheng, Yarui Wei, Jingli Chen, Huirong Guo, Baohong Wen, Shufan Dai, Yan Zhang, Jingliang Cheng, Shaoqiang Han
Summary: There are different patterns of brain activity in pediatric and adult OCD patients. Pediatric patients showed significantly higher ALFF in the default mode network and increased ALFF and dynamic ALFF in the precentral gyrus compared to adult patients. Compared to controls, OCD patients had increased ALFF in the hippocampal gyrus, cerebellum network, and increased dALFF in the middle and inferior occipital gyrus, bilateral paracentral lobule, and sensorimotor network.
JOURNAL OF AFFECTIVE DISORDERS
(2022)
Article
Engineering, Geological
Jian Yang, Li-Yun Fu, Yonghao Zhang, Tongcheng Han
Summary: This study investigates the temperature and pressure-dependent elastic properties of porous rocks in relation to the characteristics of pore microstructures. The results show that these microstructural properties can be estimated from dynamic and static moduli, and can be described using the MT and DZ models.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Samuel Chapman, Jerome Fortin, Ariel Gallagher, Jan V. M. Borgomano
Summary: Numerous experimental studies have shown that there are significant differences between the static and dynamic elastic moduli of rocks, which are attributed to the presence of cracks and uncemented grain contacts. This study investigated the impact of strain amplitude on the bulk modulus of different rock types and observed a transition from dynamic to static modulus with increasing strain amplitude. The presence of slip at grain contacts explains this transition.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Manufacturing
Erdong Wang, Jiahui Zhou, Xiao Guo, Man Gu, Huiran Wang, Wei Zhai
Summary: This study systematically investigates the mechanical behavior of metallic lattice structures based on triply periodic minimum surfaces under various loading rates. The results show that the lattice structures exhibit better densification strain resistance and enhanced energy absorption capabilities under dynamic compression. The rate-dependence of the lattice base material dominates at medium strain rates, while the inertia effect becomes notable at higher strain rates. An empirical formula is introduced to predict the shock stress responses, and constitutive models with strain-rates are proposed for uniform and graded lattices.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Geochemistry & Geophysics
Jimmy Xuekai Li, Reza Rezaee, Tobias M. Muller, Mahyar Madadi, Rupeng Ma, Mohammad Sarmadivaleh
Summary: Understanding seismic wave propagation in granular porous media is crucial for subsurface characterization. This study investigates the influence of wettability conditions on wave propagation in (partially) saturated granular porous media through laboratory experiments. The results reveal that the presence of liquid bridges in water-wetting conditions reinforces force chains and increases the P-wave velocity, leading to incoherent scattering. In contrast, gas-wetting conditions prevent the formation of liquid bridges, resulting in negligible incoherent scattering.
Article
Mechanics
Amine Harkati, El Haddi Harkati, Abderrezak Bezazi, Fabrizio Scarpa, Morvan Ouisse
Summary: This work evaluates the out-of-plane properties of a curved wall honeycomb structure using analytical models and finite element techniques. The effects of wall curvature and honeycomb cell depth on the out-of-plane elastic constants are assessed, showing excellent agreement between theoretical and numerical models. The study also demonstrates specific upper shear bounds in these honeycombs, which can be tailored based on the radiuses of the curved cell walls and internal cell angles.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
William de Araujo Thomaz, Dan Yushin Miyaji, Edna Possan
Summary: The study compared Young's moduli of 28-day concrete determined through destructive tests with results of nondestructive tests, finding that the source of coarse aggregate had the most significant impact. Dynamic moduli were higher than static moduli, with equations derived to predict static moduli from dynamic values. The proposed equations aim to enhance Brazilian standard test methods.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Neurosciences
Jing Li, Xiaocheng Yu, Yan Zou, Yangming Leng, Fan Yang, Bo Liu, Wenliang Fan
Summary: This study investigated intrinsic brain activity alterations in sudden sensorineural hearing loss (SSHL) using static and dynamic fractional amplitude of low-frequency fluctuation (fALFF) analysis. The findings revealed significant differences in static fALFF patterns between SSHL patients and healthy controls, suggesting disruptions in brain activity and potential compensatory mechanisms associated with hearing loss. These insights highlight the importance of understanding neural alterations in SSHL for the development of targeted interventions and rehabilitation strategies.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Geochemistry & Geophysics
Yu I. Kolesnikov, K. V. Fedin
GEOPHYSICAL PROSPECTING
(2018)
Article
Mining & Mineral Processing
Yu I. Kolesnikov, K. V. Fedin, A. A. Kargapolov, A. F. Emanov
JOURNAL OF MINING SCIENCE
(2012)
Article
Mining & Mineral Processing
Yu. I. Kolesnikov, K. V. Fedin, A. A. Kargapolov, A. F. Emanov
JOURNAL OF MINING SCIENCE
(2012)
Article
Geosciences, Multidisciplinary
A. F. Emanov, A. A. Emanov, E. V. Leskova, Yu. I. Kolesnikov, V. V. Yankaitis, A. G. Filina
RUSSIAN GEOLOGY AND GEOPHYSICS
(2012)
Article
Engineering, Civil
K. V. Fedin, D. A. Pechenegov, Yu. I. Kolesnikov, L. Ngomayezwe, N. V. Yurkevich
Summary: This study presents the results of a geophysical survey conducted on the Sukhumi Lighthouse, which was built in 1861. The survey determined the stress-strain state, residual resource, tension of the fastening cables, fixation of piles in the ground (rigid/nonrigid), and immersion depth of the lighthouse. The passive seismic standing method and the tapping method were used to extract natural vibrations and record reflected seismic waves for analysis.
Article
Geochemistry & Geophysics
Konstantin Fedin, Yury Kolesnikov, Luckymore Ngomayezwe
Summary: Using the passive seismic standing waves method, a successful mapping of the Barsukovskaya karst cave in Novosibirsk, Russia was conducted. A map of the lowest mode frequency distribution over the cave roof was constructed through areal passive seismic survey, showing consistency with the cave diagram drawn up earlier by speleologists.
GEOPHYSICAL PROSPECTING
(2021)
Article
Mining & Mineral Processing
Yu. I. Kolesnikov, K. V. Fedin, L. Ngomaizve
JOURNAL OF MINING SCIENCE
(2019)
Article
Geosciences, Multidisciplinary
SV Gol'din, VS Seleznev, AF Emanov, AG Filina, AA Emanov, IS Novikov, EM Vysotskii, AV Fateev, YI Kolesnikov, VG Podkorytova, EV Leskova, MA Yarygina
DOKLADY EARTH SCIENCES
(2004)
Article
Mining & Mineral Processing
LA Nazarov, YI Kolesnikov
JOURNAL OF MINING SCIENCE
(2002)
Article
Geosciences, Multidisciplinary
Yu. I. Kolesnikov, M. M. Nemirovich-Danchenko, S. V. Goldin, V. S. Seleznev
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2003)
Article
Geosciences, Multidisciplinary
YI Kolesnikov, SM Babushkin, AD Duchkov, AF Emanov, VS Seleznev, VM Solov'ev, GM Trigubovich
GEOLOGIYA I GEOFIZIKA
(2001)
