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Numerical study on the evolution characteristics of contact and fluid flow in shear-induced rough joint.
Sci Rep
December 2024
College of Civil Engineering, Guizhou University, Huaxi District, Guiyang, 550025, Guizhou, China.
In order to investigate the influence of shear on contact characteristics and fluid flow evolution of rough rock fractures, a series of shear-flow tests were carried out by numerical experiments. Firstly, a sandstone specimen with a rough fracture was made in the laboratory, and the numerical model of the fracture was reconstructed in FLAC3D software. Experiments were conducted to investigate the depth of penetration of the fracture under different normal stress (1, 3, and 5 MPa) and shear displacement (2, 4, 6, 8, and 10 mm).
View Article and Find Full Text PDFAssessment of surface treatment methods for strengthening the interfacial adhesion in CARALL fiber metal laminates.
Sci Rep
December 2024
Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
Metal and polymer interface bonding significantly influences the mechanical performance of fiber metal laminates (FMLs). Therefore, the effect of surface treatments (mechanical abrasion, nitric acid etching, P2 etching, sulfuric acid anodizing (SAA), and electric discharge machine (EDM) texturing) carried on aluminum 2024-T3 alloy sheets was evaluated considering surface morphology, surface topography, and surface roughness. Further, the influence of surface treatments on interfacial adhesion strength and failure mode between the aluminum alloy and carbon fiber prepreg was investigated.
View Article and Find Full Text PDFEnhanced characterization of wheat straw-PLA composites with silane coupling agent and alkali pretreatment.
Ecotoxicol Environ Saf
December 2024
Hebei University of Science and Technology, 050018, China. Electronic address:
Polylactic acid (PLA) composites with high straw content face several challenges, primarily due to the inherent brittleness of straw and its poor compatibility with the polymer matrix. In this study, scanning electron microscopy (SEM) was used to analyze the microscopic structure of wheat straw chemically modified by NaOH and the silane coupling agent, and it was concluded that both treatments effectively removed waxes and silica from the surface of the straw, enhanced fiber roughness, and improved interfacial adhesion. Notably, the silane coupling agent treatment not only facilitated the formation of chemical bonds between the straw fibers and the PLA matrix but also filled the interfiber pores, significantly increasing the structural density.
View Article and Find Full Text PDFCellular and genetic responses of Phaeodactylum tricornutum to seawater acidification and copper exposure.
Mar Environ Res
December 2024
Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced Study, Shenzhen University, Shenzhen, China. Electronic address:
The ongoing decline in seawater pH, driven by the absorption of excess atmospheric CO, represents a major environmental issue. This reduction in pH can interact with metal pollution, resulting in complex effects on marine phytoplankton. In this study, we examined the combined impacts of seawater acidification and copper (Cu) exposure on the marine diatom Phaeodactylum tricornutum.
View Article and Find Full Text PDFExtraordinary SERS on nanostructured self-assembled silver films due to preliminary random nano-profiling of substrate and ultrasonic exposure of analyte during the deposition.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Institute for Theoretical and Applied Electromagnetics RAS, Moscow 125412, Russia; Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russia.
In this study, we have investigated the surface-enhanced Raman scattering (SERS) spectra of myoglobin on silver substrates with different morphology. The aim was to determine the optimal parameters of analyte and substrate preparation for obtaining of high-amplitude SERS spectra of proteins. It is shown that not only the morphology of the silver film, but also the method of analyte molecules deposition on the SERS substrate plays an important role.
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