REPOSITÓRIO INSTITUCIONAL DA UNIVERSIDADE DO VALE DO PARAÍBA
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Submissões Recentes
Study of (12Co–4Cr WC) and (Cr3C2–25NiCr) coatings sprayed by the HVOF process and subsequently laser remelted
(UFSCar) Oliveira, Ana Claudia Costa; Carvalho, Edinelson; Dyer, Paulo; Silva, Maria Margareth da; Vieira, Lucia; Silveira, Carolina Hahn da; Vasconcelos, Getúlio de
The laser remelting technique on tungsten carbide (12Co–4Cr WC) and chromium carbide (Cr3 C2 –25NiCr) coatings deposited by HVOF provides improvements in surface properties, such as increased hardness and resistance to abrasive wear. This process uses a laser beam to selectively melt the coating, promoting a uniform and adherent layer. In the present work, tungsten carbide and chromium carbide alloy coatings were deposited on properly prepared SAE 1020 substrates using the high-speed oxy-fuel (HVOF) technique. After deposition, the coatings were remelted with a laser beam, varying the scanning speed and the laser beam power of the ytterbium fiber to obtain a pore- and crack-free coating and better metallurgical anchorage to the substrate. The samples were characterized by scanning electron microscopy (SEM), X-ray diffractogram, ASTM G132 Standard Test Method for Pin Abrasion Testing wear and microhardness. The results show that it was possible to obtain coatings with greater hardness after the laser remelting process, reducing pores or imperfections and metallurgically bonding to the substrate.
Effects of graphene nanoplatelets dispersion on the mechanical properties of epoxy resin and carbon fiber laminated composites
(Sage) Donda, Giovanni Moreira; Ortega, Fernando dos Santos; Xavier, Gabriel Doria; Lima, João Vitor Feo; Ricardo, Fernando Valente; Passador, Fabio Roberto; Oliveira, Ivone Regina de
Graphene-related materials (GRM) show great potential as reinforcement in polymeric matrices, offering enhanced physicochemical and mechanical properties. In the aerospace sector, reinforced composites are increasingly used for their superior mechanical attributes and design flexibility. Incorporating graphene nanoplatelets (GNP) into epoxy resin (ER) is a promising approach to enhance the resin’s fracture toughness. The effectiveness of these nanocomposites depends heavily on the dispersion of nanoparticles within the matrix. Therefore, this work aimed to produce nanocomposites based on ER and GNP by evaluating different mixing processes and assessing the influence of GNP content on the resin ́s properties, to determine the optimal conditions for the incorporation GNP-ER as matrix to produce hybrid laminated composites with carbon fiber fabric. Characterization of GNP powder revealed its organization in regular nanoplatelet stacking patterns, exhibiting multilayers with few defects. The characterization of nanocomposites showed that ultrasonication dispersion improved the dispersion of GNP in the resin, reducing agglomerates and increasing homogeneity. Tensile tests dem- onstrated that ultrasonication led to an increase of approximately 14% in the ultimate tensile strength (UTS) and up to 46% in the deformation at the break of the nanocomposites. Carbon fibers/GNP-ER composites were produced by the hand lay- up process and exhibited a decrease in UTS with the addition of GNP, suggesting that GNP may have acted as stress concentrators or even modified the viscosity of the matrix, which may have hindered the matrix ́s ability to penetrate the carbon fabric, thereby reducing the mechanical properties.
Análise do financiamento da saúde em período pandêmico: a COVID-19 e os repasses aos municípios do Vale do Paraíba e Litoral Norte, SP, entre 2020 e 2022
(Universidade de Taubaté) Santos, Micael Henrique da Silva; Gomes, Cilene; Costa, Sandra Maria Fonseca da
Este artigo tem como objetivo apresentar uma pesquisa sobre o percentual de participação das transferências de recursos da União para o SUS dos municípios da RMVPLN, SP, entre 2020 e 2022, e comparar o período de maior número de casos e óbitos por COVID- no Brasil e nos municípios da Região, com o percentual de transferências estaduais para a saúde desses municípios, no mesmo período. É uma pesquisa quantitativa, exploratória e comparativa; os dados foram extraídos a partir de pesquisa documental, utilizando-se de fontes primárias e pesquisa bibliográfica. Os resultados demonstram que a Região em estudo apresentava desigualdades socioterritoriais antes da pandemia e, após, desigualdades também foram observadas nos repasses da União e do estado de São Paulo para o setor de saúde dos 39 municípios que a compõem, comprometendo os pequenos municípios que não dispõem dos mesmos recursos que municípios maiores.
Polyelectrolytic gelatin nanoparticles as a drug delivery system for the promastigote form of Leishmania amazonensis treatment
(Taylor & Francis) Souza, Catarina de; Carvalho, Janicy Arantes; Abreu, Alexandro da Silva; Paiva, Lucas Prudente de; Ambrósio, Jéssica Aparecida Ribeiro; Beltrame Junior, Milton; Oliveira, Marco Antonio de; Mittmann, Josane; Simioni, Andreza Ribeiro
In this study, phthalocianato[bis(dimethylaminoethanoxy)] silicon (NzPC) was loaded onto gelatin nanoparticles functionalized with polyelectrolytes (polystyrene sulfonate/polyallylamine hydrochlor- ide) by layer-by-layer (LbL) assembly for photodynamic therapy (PDT) application in promastigote form of Leishmania amazonensis treatment. The process yield, and encapsulation efficiency were 80.0% ± 1.8 and EE 1⁄4 87.0% ± 1.1, respectively. The polyelectro- lytic gelatin nanoparticles (PGN) had a mean diameter of 437.4±72.85nm, narrow distribution size with a polydispersity index of 0.086. The obvious switching of zeta potential indicates successful alternating deposition of the polyanion PSS and polyca- tion PAH directly on the gelatin nanoparticles. Photosensitizer photophysical properties were shown to be preserved after gel- atin nanoparticle encapsulation. The impact of the PDT in the via- bility and morphology of Leishmania amazonensis promastigote in culture medium was evaluated. The PGN-NzPc presented low tox- icity at the dark and the PDT was capable of decreasing the via- bility in more than 80% in 0.1mmol.L 1 concentration tested. The PDT also triggered significant morphological alterations in the Leishmania promastigotes. These results reinforce the idea that the use of PGN as photosensitizers carriers is useful for PDT of Leishmania promastigotes.
(PhSe)2 and (pCl-PhSe)2 organochalcogen compounds inhibit Candida albicans adhesion to human endocervical (HeLa) cells and show anti- biofilm activities
(Taylor & Francis) Silva, Bruna Marques da; Braga, Marília Toledo; Passos, Juliene Cristina da Silva; Carvalho, Moisés Lopes; Rosseti, Isabela Bueno; Amorim, Laís Mayara Machado de; Rocha, João Batista Teixeira da; Silva, Carlos Alberto; Costa, Maricilia Silva
Adhesion capacity on biological surfaces and biofilm formation is considered an important step in the infection process by Candida albicans. The ability of (PhSe)2 and (pCl-PhSe)2, two synthetic organic selenium (organochalcogen) compounds, to act on C. albicans virulence factors related to adhesion to human endocervical (HeLa) cell surfaces and their anti-biofilm activities was ana- lyzed. Both organochalcogen compounds inhibited C. albicans adhesion to HeLa cells, depend- ent on compound concentrations. (PhSe)2 (at 20 mM; p 1⁄4 0.0012) was significantly more effective than (pCl-PhSe)2 (at 20 mM; p 1⁄4 0.0183) compared with the control. (PhSe)2 inhibited biofilm for- mation and decreased biofilm viability in both early and mature biofilms more efficiently than (pCl-PhSe)2. Overall, the organochalcogen compounds, especially (PhSe)2, were demonstrated to be effective antifungal drugs against C. albicans virulence factors related to epithelial cell surface adhesion and the formation and viability of biofilms.