19 hasil untuk "Muhammad Sahimi"
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Artikel Jurnal
Molecular origin of sliding friction and flash heating in rock and heterogeneous materials
Abstract It is generally believed that earthquakes occur when faults weaken with increasing slip rates. An important factor contributing to this phenomenon is the faults’ dynamic friction, which may be reduced during earthquakes with high slip rates, a process known as slip-rate weakening. It has…
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Artikel Jurnal
Machine learning and digital images of porous materials: from rock to the human brain
Porous media and materials are ubiquitous and found everywhere. Some of them are referred to as rock-like porous media (RLPM), which include soil, concrete, asphalt, and oil and gas reservoirs. A second group consists of biological porous materials (BPMs), ranging from skin to organs such as the…
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Artikel Jurnal
Evolution of Frictional Strength of Dry Sheared Granular Porous Media During Slip-Rate Weakening
Using the discrete-element method, we study loss of shear strength at frictional asperity contacts, induced by flash heating, in a granular fault gouge. The magnitude of the reduction in the shear stress and the local friction coefficients are computed over a wide range of shear velocities Vs. For…
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Artikel Jurnal
Hertz‐Mindlin Theory of Contacting Grains and the Effective‐Medium Approximation for the Permeability of Deforming Porous Media
Abstract Estimating flow and transport properties of porous media that undergo deformation as a result of applying an external pressure or stress is important to a wide variety of processes, ranging from shale formations into which a fracking liquid is injected to CO2 sequestration in geological…
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Artikel Jurnal
Multi‐Scale Soil Salinization Dynamics From Global to Pore Scale: A Review
Abstract Soil salinization refers to the accumulation of water‐soluble salts in the upper part of the soil profile. Excessive levels of soil salinity affects crop production, soil health, and ecosystem functioning. This phenomenon threatens agriculture, food security, soil stability, and fertility…
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Artikel Jurnal
Simulating fluid flow in complex porous materials by integrating the governing equations with deep-layered machines
Abstract Fluid flow in heterogeneous porous media arises in many systems, from biological tissues to composite materials, soil, wood, and paper. With advances in instrumentations, high-resolution images of porous media can be obtained and used directly in the simulation of fluid flow. The…
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Artikel Jurnal
Predicting Streamflow Elasticity Based on Percolation Theory and Ecological Optimality
Abstract How much terrestrial precipitation is used by vegetation and how much runs off, represents central issues in hydrologic science, ecology, climate change, and even geopolitics. We present a theory for the water balance to predict the fractional change in streamflow due to given fractional…
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Artikel Jurnal
Least‐Resistance Path as a Proxy for Efficient Simulation of Solute Transport in Heterogeneous Porous Media
Abstract Accurately predicting solute transport remains a central challenge in hydrogeology due to limited data and multiscale subsurface heterogeneity. Fractional Brownian motion (fBm) is widely used to model the logarithm of hydraulic conductivity fields. We introduce an exact and computationally…
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Artikel Jurnal
Scale Effect on Evapotranspiration: Predicting the Continental and Global Scale Water Balance Based on Percolation Theory and Optimality Principle
Abstract Moisture recycling over the continents, which is known to increase with increasing spatial scale, increases both precipitation and sensible heat fluxes without increasing the overall latent heat flux, implying a reduction in evapotranspiration (ET) with increasing spatial scale. One may…
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Artikel Jurnal Teks lengkap
Species Richness Net Primary Productivity and the Water Balance Problem
Species energy theory suggests that, because of limitations on reproduction efficiency, a minimum density of plant individuals per viable species exists and that this minimum correlates the total number of plant individuals N with the number of species S. The simplest assumption is that the mean…
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Artikel Jurnal
Predicting Ecosystem Net Primary Productivity by Percolation Theory and Optimality Principle
Abstract The basic partitioning of precipitation P into evapotranspiration ET and run‐off Q is known as the “central problem of hydrology.” ET depends primarily on precipitation, P, and potential evapotranspiration, PET, which are connected by the biological process of photosynthesis…
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Artikel Jurnal
Saturation Dependence of Non‐Fickian Transport in Porous Media
Abstract In two‐phase flow through porous media, the percolating pathways can be hydrodynamically split into the flowing and stagnant regions. The highly variable velocity field in the pore space filled by the carrier fluid leads to significant differences in the transport time scales in the two…
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Artikel Jurnal
Effect of Elastic Deformation and Rough Grain Surface on Heat Conduction in Partially Saturated Granular Porous Media
Abstract Accurate prediction of the effective thermal properties of partially saturated rock, soil, and other types of porous media is essential to a wide variety of phenomena and processes in engineering and natural sciences. The effective thermal conductivity of porous media depends strongly on…
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Artikel Jurnal
Graphyne-3: a highly efficient candidate for separation of small gas molecules from gaseous mixtures
Abstract Two-dimensional nanosheets, such as the general family of graphenes have attracted considerable attention over the past decade, due to their excellent thermal, mechanical, and electrical properties. We report on the result of a study of separation of gaseous mixtures by a model graphyne-3…
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Artikel Jurnal
Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
Abstract Increasing salinity in groundwater and soil poses a threat to water and land resources. With the expectation of major changes to the hydrological cycle through climate change, the need for understanding the fundamental processes governing solute transport through soil has grown…
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Artikel Jurnal
Data-driven reconstruction of stochastic dynamical equations based on statistical moments
Stochastic processes are encountered in many contexts, ranging from generation sizes of bacterial colonies and service times in a queueing system to displacements of Brownian particles and frequency fluctuations in an electrical power grid. If such processes are Markov, then their probability…
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Artikel Jurnal
Wood biomimetics: Capturing and simulating the mesoscale complexity of willow using cross-correlation reconstruction algorithm and 3D printing
Biomimetics -using nature to inspire innovation- has resulted in the development of many novel materials. Wood, nature’s light-weight structural material, defies mimicry at multiple scales, but its design features have been abstracted and used to develop honeycomb composites of limited geometric…
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Artikel Jurnal
Gaia: Complex systems prediction for time to adapt to climate shocks
Abstract Earth's climate has undergone significant fluctuations in the geologic past, while the sun's radiation continues to increase, yet has always returned to conditions highly favorable to life. Thus, the biosphere overall appears able to cancel effects of external trends as well as provide…
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Artikel Jurnal
Soil salinization due to saltwater intrusion in coastal regions: The role of soil characteristics and heterogeneity
Soil plays a vital role in maintaining ecosystem functionality, supporting biodiversity, facilitating successful crop production, and ensuring socio-economic stability. Soil quality is, however, constantly threatened by various factors, such as adverse climate conditions, hydrogeological processes…