60418 research outputs found
Sort by
Effects of chemical pretreatment on natural fibers removal and microplastics integrity for wastewater characterization
No full textABSTRACT: Nine digestion protocols were tested to quantify microplastics in wastewater using nine polymeric and three natural fiber controls representative of common microplastics in wastewater. Protocols were also evaluated for their impact on natural fibers, which can interfere with microplastic quantification. Control size change and visual integrity were assessed, revealing that a sequential 24-h treatment with 6% NaClO at room temperature (RT) followed by 24 h with 30% H₂O₂ at 40 °C preserved polymer integrity while fully oxidizing natural fibers, even when preincubated in real wastewater samples. A Fourier-transform infrared spectroscopy (FTIR) validation using the carbonyl index (CI) and carbon–oxygen index (COI) showed significant changes in poly(ethylene terephthalate) (PET) and polyvinyl chloride (PVC) after digestion but did not compromise FTIR spectrum recognition. The protocol applied to raw wastewater samples showed optimal performance at 300 mg Cl₂/L, achieving up to 95% Chemical Oxygen Demand (COD) and 92% turbidity reduction. No further improvements in COD or turbidity removal were observed beyond this dose, regardless of initial COD levels. The present approach affords greater comparability with existing studies thanks to a large range of polymeric, natural controls, and oxidant dose investigations regarding common water quality parameters
Fabrication and Performance of Randomly Patterned Tri-Layer Flexible and Transparent Electrodes
No full text
A Compact High-Speed Capacitive Data Transfer Link With Common Mode Transient Rejection for Isolated Sensor Interfaces
No full text
Apprentissage de bornes duales valides en programmation par contrainte : Décomposition lagrangienne amplifiée avec apprentissage auto-supervisé
No full textBraid-trusion of hollow thermoplastic composites using an expanding mandrel approach.
Get PDFABSTRACT: Braid-trusion involves the combination of a braiding machine with a pultrusion line to continuously produce composite structures with a constant cross-section and angle-oriented fibres. During the braid-trusion process, braids are subjected to tension and compression, which leads to braid deformation and fibre orientation variations. Successful braid-trusion of tubular structures requires a braid design methodology that accounts for braid deformations during its passage in the pultrusion die. Here, we present a braid design methodology for square hollow pultruded beams reinforced by triaxial braids. It is proposed that the internal perimeter of the braid, constrained by the braiding and pultrusion mandrels, must expand during pultrusion to account for braid consolidation. Two braid designs are proposed. The first has a constant braiding and pultrusion mandrel perimeter. The second has a braiding mandrel perimeter that is 0.9 times that of the pultrusion mandrel, referred to as the expanding mandrel approach. The design demonstrated the effect of an expanding mandrel in reducing fibre waviness by achieving similar braiding yarn lengths. Glass fibre/polyethylene terephthalate composites were pultruded with the constant and expanding mandrels. The constant mandrel braid-trusion failed while the expanding mandrel succeeded
A Resource-Efficient Algorithm-Hardware Co-Design Towards Semi-Supervised Neurological Symptoms Prediction
No full text
