Abstract The non‐Darcy flow behavior in unfilled and fully filled rough fractures has been investigated thoroughly for decades. Natural usually be partially with porous media due to long‐term internal external dynamic disturbances water erosion. However, how evaluate the nonlinear seepage characteristics of fracture (PFRF) is never scrutinized. In present study, 2D direct numerical simulations are conducted investigate through 6 PFRF models under different filling conditions (i.e., degree,...

A smooth operator: The copper-catalyzed synthesis of phenols from aryl halides was carried out under relatively mild reaction conditions. Alkyl ethers and benzofurans could also be prepared smoothly by one-pot domino protocols based on hydroxylation iodides (see scheme). Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted the authors. Please note: publisher is...

Abstract Fractures significantly alter the permeability characteristics of natural porous media, especially for multilayered medium system. The most direct and effective approach to assess hydraulic conductivity a with continuous fracture is determine its equivalent coefficient (EPC). A mathematical model second‐order accuracy established analysis incorporating fracture. Navier‒Stokes equation used govern clear fluid motion in fracture, seepage matrix governed by Brinkman‒Darcy equation....

Abstract Previous studies pointed out that the hydraulic aperture ( b h ) is solely dependent on geometric features of a fracture, independent fluid inertia effects. Here we present an inertial ih considers effect and fracture geometry by massive direct numerical simulations flow in real artificial 3‐D fractures. Simulation results indicate with increase Reynolds number Re ), evolution eddy volume ratio exhibits three distinct stages: stable stage < 1), fluctuating (1 ≤ 10), increasing to...

How to effectively use clean renewable energy improve the capacity of power grid absorb new and optimize structure has become one China’s current issues. The Yalong River Wind-PV-Hydro complementary base was chosen as research object from which analyze output complementarity principle characteristics wind farms, photovoltaic plants, hydropower stations. Then, an optimization scheduling model established with objective minimizing amount abandoned maximizing stored in cascade A Progress...

The transformed $l_1$ penalty (TL1) functions are a one parameter family of bilinear transformations composed with the absolute value function. When acting on vectors, TL1 interpolates $l_0$ and similar to $l_p$ norm ($p \in (0,1)$). In our companion paper, we showed that is robust sparsity promoting in compressed sensing (CS) problems for broad range incoherent coherent matrices. Here develop an explicit fixed point representation regularized minimization problem. thresholding closed form...

To enable DNNs on edge devices like mobile phones, low-rank approximation has been widely adopted because of its solid theoretical rationale and efficient implementations. Several previous works attempted to directly approximate a pre-trained model by decomposition; however, small errors in parameters can ripple over large prediction loss. As result, performance usually drops significantly sophisticated effort fine-tuning is required recover accuracy. Apparently, it not optimal separate from...

The friction factor is one of the key parameters for evaluating fluid flow characteristics and pressure head loss in fractures, accurate prediction crucial a deeper understanding fracture processes. Traditional studies often consider roughness effects only inertial factor, overlooking its impact on viscous factor. To address this limitation, study introduces equivalent permeability non-Darcy coefficient rough fractures fits Forchheimer equation using 78 experimental data points, proposing...

The soil water content (SWC) is a critical factor in agricultural production. To achieve real-time and nondestructive monitoring of the SWC, an experiment was conducted to measure hyperspectral reflectance samples with varying levels content. were divided into two parts, SWC higher than field capacity (super-θf) lower (sub-θf), outliers detected by Monte Carlo cross-validation (MCCV). raw spectra processed using Savitzky–Golay (SG) smoothing then spectral feature variable extracted...

Gruppentausch: Die kupferkatalysierte Synthese von Phenolen aus Arylhalogeniden gelang unter relativ milden Reaktionsbedingungen. Alkylarylether und Benzofurane ließen sich glatt durch Eintopf-Dominoreaktionen herstellen, die auf einer Hydroxylierung Aryliodiden beruhten (siehe Schema). Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors. Please...

This paper studies the multichannel missing data recovery problem when measurements are generated by a dynamical system. A new model, termed low-rank Hankel matrices, is proposed to characterize intrinsic low-dimensional structures in time series. The formulated as nonconvex optimization problem, and two fast algorithms (AM-FIHT RAM-FIHT), both with linear convergence rates, developed recover points provable performance guarantees. required number of observations significantly reduced,...

This paper studies the robust matrix completion (RMC) problem with objective to recover a low-rank from partial observations that may contain significant errors. If all in one column are erroneous, existing RMC methods can locate corrupted at best but cannot actual data column. Low-rank Hankel matrices characterize additional correlations among columns besides low-rankness and exist power system monitoring, magnetic resonance imaging (MRI) imaging, array signal processing. Exploiting...

Abstract Benzoxazinyl modified polyhedral oligomeric silsesquioxane (BZPOSS) is successfully synthesized and used to prepare nanocomposites with bisphenol A type epoxy resin (E51). The differential scanning calorimetry results showed the curing peak temperature of E51/BZPOSS blend decrease 242°C, suggesting high catalytic activity BZPOSS polymerization E51. electron microscope micrographs poly(E51/BZPOSS)s silicon element distribution maps given by EDS both demonstrated homogeneous...