DSpace Coleção:http://www.repositorio.ufop.br/jspui/handle/123456789/4812024-03-28T14:21:16Z2024-03-28T14:21:16ZWeak participation and ideological exemption : the latest stage of EIA simplification in Brazil?Fonseca, Alberto de Freitas Castrohttp://www.repositorio.ufop.br/jspui/handle/123456789/174392023-09-13T21:24:19Z2023-01-01T00:00:00ZTítulo: Weak participation and ideological exemption : the latest stage of EIA simplification in Brazil?
Autor(es): Fonseca, Alberto de Freitas Castro
Resumo: Developers’ concerns over the costs and delays of environmental impact assessment (EIA) have increasingly been driving ‘simplification’ solutions and reforms. This letter critically reviews the evolution of EIA simplification in Brazil. More specifically, it (1) sets out to describe the main stages of EIA simplification in Brazil, and (2) calls for conceptually clear and evidence-based simplification reforms. I argue that the first simplification efforts in Brazil mirrored an attempt to bring procedural proportionality to EIA. But simplification gradually became a more nuanced phenomenon reflecting a variety of streamlining, digitalization, and decentralization strategies. However, the many simplification efforts do not seem to be affecting developers’ predominant perception about EIA ineffectiveness. Brazil may be witnessing a more radical stage of EIA simplification, in which ‘simplicity’ is pursued through weak public participation and the exemption of specific economic sectors of the Brazilian economy from EIA. Without conceptually clear and evidence-based simplification reforms, debates over EIA effectiveness are likely to be influenced by simplistic win-win narratives, and Brazil’s increasingly fragile environment is likely to get worse.2023-01-01T00:00:00ZWeathering resistance of Linz–Donawitz (LD) slag as ballast material using freeze-thaw and sulfate soundness.Alves, Hebert da ConsolaçãoGomes, Guilherme José Cunhahttp://www.repositorio.ufop.br/jspui/handle/123456789/174382023-09-13T21:17:20Z2023-01-01T00:00:00ZTítulo: Weathering resistance of Linz–Donawitz (LD) slag as ballast material using freeze-thaw and sulfate soundness.
Autor(es): Alves, Hebert da Consolação; Gomes, Guilherme José Cunha
Resumo: As nonrenewable natural aggregates with acceptable geotechnical properties become scarce, costly, and entail negative environmental impacts, the study of alternatives remains a first-order challenge for sustainable railway design. This paper focuses on the physical and chemical weathering effects of the industrial byproduct Linz–Donawitz (LD) slag as a ballast material. For this purpose, 75 freeze–thaw (F-T) and 40 sulfate soundness (SS) cycles were carried out on the byproduct. We present a series of laboratory experiments involving particle characteristics, durability and strength for different F-T and SS cycles. To benchmark the performance of LD slag, we also performed our experiments on two natural aggregates: gneiss and basalt. Our main findings reveal that: (i) the shape of LD slag ballast and its particle size distribution are unnafected by the F-T and SS cycles, (ii) the basalt exhibits higher magnitudes of fouling after SS cycles, (iii) losses in Los Angeles abrasion and shock resistance were much more pronounced in SS tests for all ballast materials, (iv) LD slag is more resistant and less susceptible to the degrading effects of freezing and thawing, (v) point load tests indicate that the loss of resistance of basalt is small compared to that of gneiss, (vi) the byproduct showed a decrease in strength of 87% after 40 SS cycles, suggesting that chemical weathering exerts a dominant control on the performance of LD slag. The findings are relevant to elucidate the physical and chemical weathering effects of LD slag and to promote its sustainable use.2023-01-01T00:00:00ZSodium butyrate-loaded nanoparticles coated with chitosan for the treatment of neovascularization in age-related macular degeneration : ocular biocompatibility and antiangiogenic activity.Reis, Júlia Stephania dosTeixeira, Aniely dos ReisQuaresma, Amanda de VasconcelosAlmeida, Tamires CunhaArribada, Raquel GregorioNeto, Julia TeixeiraSilva, Fábio Henrique Rodrigues daCunha Júnior, Armando da SilvaMoura, Sandra Aparecida Lima deSilva, Glenda Nicioli daFialho, Sílvia LigórioSilva, Gisele Rodrigues dahttp://www.repositorio.ufop.br/jspui/handle/123456789/174372023-09-13T21:07:38Z2022-01-01T00:00:00ZTítulo: Sodium butyrate-loaded nanoparticles coated with chitosan for the treatment of neovascularization in age-related macular degeneration : ocular biocompatibility and antiangiogenic activity.
Autor(es): Reis, Júlia Stephania dos; Teixeira, Aniely dos Reis; Quaresma, Amanda de Vasconcelos; Almeida, Tamires Cunha; Arribada, Raquel Gregorio; Neto, Julia Teixeira; Silva, Fábio Henrique Rodrigues da; Cunha Júnior, Armando da Silva; Moura, Sandra Aparecida Lima de; Silva, Glenda Nicioli da; Fialho, Sílvia Ligório; Silva, Gisele Rodrigues da
Resumo: Sodium butyrate-loaded nanoparticles coated chitosan (NaBu-loaded nanoparticles/CS) were developed to treat the choroidal neovascularization in wet age-related macular degeneration (AMD). The nanoparticles were produced by double emulsification and solvent evaporation technique, optimized by experimental statistical design, characterized by analytical methods, investigated in terms of in vitro and in vivo ocular biocompatibility, and evaluated as an antiangiogenic system in vivo. The NaBu-loaded nanoparticles/CS were 311.1 ± 3.1 nm in diameter with a 0.208 ± 0.007 polydispersity index; had a +56.3 ± 2.6 mV zeta potential; showed a 92.3 % NaBu encapsulation efficiency; and sustained the drug release over 35 days. The NaBu-loaded nanoparticles/CS showed no toxicity to human retinal pigment epithelium cells (ARPE-19 cells); was not irritant to the chorioallantoic membrane (CAM); did not interfere in the integrity of the retinal layers of rat’s eyes, as detected by the Optical Coherence Tomography and histopathology; and inhibited the angiogenesis in CAM assay. The NaBu-loaded nanoparticles/CS could be a therapeutic alternative to limit the neovascularization in AMD.2022-01-01T00:00:00ZBlending Linz–Donawitz and Blast Furnace slags with the Kambara reactor byproduct to improve their reuse in roadworks.Schumacher, Aécio GuilhermeGomes, Guilherme José CunhaSchneider, Denise S. G.Pires, Patrício José MoreiraGomes, Ruan Gonçalves de Souzahttp://www.repositorio.ufop.br/jspui/handle/123456789/173452023-08-23T19:24:50Z2022-01-01T00:00:00ZTítulo: Blending Linz–Donawitz and Blast Furnace slags with the Kambara reactor byproduct to improve their reuse in roadworks.
Autor(es): Schumacher, Aécio Guilherme; Gomes, Guilherme José Cunha; Schneider, Denise S. G.; Pires, Patrício José Moreira; Gomes, Ruan Gonçalves de Souza
Resumo: The use of industrial byproducts as replacement of natural aggregates has been extensively investigated to design eco-friendly roads. One of the most examined byproducts for this purpose is steel slag. However, existing studies do not explore the blending of different slags to enhance the engineering performance of base layers. The applicability of Linz–Donawitz (LD), Blast Furnace (BF) and Kambara Reactor (KR) steel byproducts is evaluated as a single base layer for rural (unsurfaced) roads in Brazil. A series of laboratory experiments were performed to assess the characteristics of eight soil-byproduct mixtures with 50% and 75% byproduct contents, including new blends of LD/KR and BF/KR slags. Additionally, the most suitable mixture was proposed considering different performance indicators. Results demonstrate the coarse-grained, nonplastic and non-expansive nature of the byproducts, with CBR values higher than 100%. The more byproduct added to soil, the larger is the strength and the lower the expansion. The mixture with 75% of the proposed LD/KR blend and 25% of a clayey soil was considered as optimum, based on a trade-off between engineering properties, environmental impacts, and material costs. Findings and discussions are relevant to reduce waste stockpiles of steel companies, helping engineers and policy makers reuse blended slag byproducts.2022-01-01T00:00:00Z