622 research outputs found
Effect of material hybridization on the strength of scarf adhesive joints
Adhesively-bonded joints have become more efficient due to the improvement of adhesivesâ characteristics. On the other hand, with the use of composites in structures it is possible to reduce weight. Due to this, new techniques are being explored, including adhesively-bonding different materials. Nowadays, in many high performance structures, it is necessary to combine composite materials with other light-weighted metals such as aluminium or titanium. This work reports on an experimental and numerical study for hybrid scarf joints between composite and aluminium adherends, and considering different values of the scarf angle (α). The numerical analysis by Finite Elements (FE), using the software AbaqusÂź, enabled the obtainment of peel (Ïy) and shear stresses (Ïxy), which are then used to discuss the strength between different joint configurations. Cohesive zone modelling (CZM) was used to predict the joint strength and the results were compared to the experiments for validation. The jointsâ behaviour was highly dependent on α, and CZM were validated for the design process of hybrid scarf joints.info:eu-repo/semantics/publishedVersio
Comparative genomics, evolution, and drought-induced expression of dehydrin genes in model Brachypodium grasses
Dehydration proteins (dehydrins, DHNs) confer tolerance to water-stress deficit in plants. We performed a comparative genomics and evolutionary study of DHN genes in four model Brachy-podium grass species. Due to limited knowledge on dehydrin expression under water deprivation stress in Brachypodium, we also performed a drought-induced gene expression analysis in 32 ecotypes of the genusâ flagship species B. distachyon showing different hydric requirements. Genomic sequence analysis detected 10 types of dehydrin genes (Bdhn) across the Brachypodium species. Domain and conserved motif contents of peptides encoded by Bdhn genes revealed eight protein architectures. Bdhn genes were spread across several chromosomes. Selection analysis indicated that all the Bdhn genes were constrained by purifying selection. Three upstream cis-regulatory motifs (BES1, MYB124, ZAT) were detected in several Bdhn genes. Gene expression analysis demonstrated that only four Bdhn1-Bdhn2, Bdhn3, and Bdhn7 genes, orthologs of wheat, barley, rice, sorghum, and maize genes, were expressed in mature leaves of B. distachyon and that all of them were more highly expressed in plants under drought conditions. Brachypodium dehydrin expression was significantly correlated with drought-response phenotypic traits (plant biomass, leaf carbon and proline contents and water use efficiency increases, and leaf water and nitrogen content decreases) being more pronounced in drought-tolerant ecotypes. Our results indicate that dehydrin type and regulation could be a key factor determining the acquisition of water-stress tolerance in grasses. © 2021 by the authors. Licensee MDPI, Basel, Switzerland
3+1 e suas (In)Variantes (ReflexÔes sobre as possibilidades de uma nova estrutura curricular na Licenciatura em Matemåtica)
Registro de ocorrĂȘncia de Panstrongylus lignarius (Walker, 1837) (Hemiptera: Reduviidae: Triatominae) no Estado de Mato Grosso, Brasil
Effect of the dry matter intake level on the sanguine profile of glucose, insulin, urea, estrogen and progesterone and concentration of IGF-I in the follicular liquid of crossbred heifers
Catastrophic shifts in the aquatic primary production revealed by a small low-flow section of tropical downstream after dredging
Characterization of Ectomycorrhizal species through molecular biology tools and morphotyping
Soil macrofauna density and diversity across a chronosequence of tropical forest restoration in Southeastern Brazil
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