Lazer nos Pimentas: estudo sobre as formas de apropriação dos espaços públicos em um bairro “periférico”

Introdução Este projeto teve início a partir da participação no projeto de extensão “Pimentas nos olhos não é refresco”, no qual consiste em uma oficina fotográfica oferecida aos jovens da região.  A  partir  da  análise  das  imagens  produzidas  por  essa  juventude  acerca  do  que representa  a  região  por  eles  habitada,  bem  como  a  experiência  de  viver  no  Bairro  dos Pimentas desde meus doze anos de idade, trouxeram-me questionamentos acerca da ocupação do tempo livre da juvent..

Phenolic acids and derivatives: studies on the relationship among structure, radical scavenging activity, and physicochemical parameters

The antiradical activity of caffeic acid (1), dihydrocaffeic acid (5), and their corresponding n-alkyl esters was evaluated by using the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH(*)) method. Dihydrocaffeic acid (5) was the most potent compound, having an antiradical effect higher than that of (+/-)-alpha-tocopherol, whereas caffeic acid (1) was less efficient. Esterification of the carboxyl group of dihydrocaffeic acid (5) had a dramatic effect on its antiradical potency, but similar effects were not observed for caffeic acid (1) derivatives. The n-alkyl esters of both phenolic series had similar potencies, and their antiradical activities were independent of the alkyl chain length. Dose-dependent scavenger effects were found in both series. Acid-base properties of the compounds, evaluated by using potentiometry and spectrophotometry, showed that the catechol moiety had pK(a2) and pK(a3) values of 9. 24-9.02 and 11.38-10.99 in the dihydrocaffeic series and 8.48-8.24 and 11.38-11.07 in the caffeic series, respectively. Antiradical activity and pK(a) values of the compounds were not related.info:eu-repo/semantics/publishedVersio

Novel trends on the assessment and management of maritime infrastructures: Outcomes from GIIP project

Climatic conditions, load, fatigue, aging and other factors causes a deterioration in civil infrastructures. As a consequence, repair and maintenance work actions are needed, being the former considered as more expensive than the latter ones. Indeed, an accurate method for measuring corrosion is a fundamental prerequisite for the detection of damaged areas and for planning an effective repairing of concrete maritime structures. In this article a comparation between two surrogate models, Markov Chains and Neuronal Networks, is presented and applied to predict the results of corrosion sensors of an infrastructure data set. The proposed methodology benefits from current monitoring practice and have the objective to develop a modular decision support system for the integrated asset management, taking into account operational, economic and environmental criteria. The results could contribute to the possibility of adapting these degradation models to aggressive environments and repaired structures, thus generating accurate maintenance strategies, and reducing costs. This methodology is part of the ongoing study “GIIP- Intelligent Port Infrastructure Management”

Polymer single screw extruder optimization using tchebycheff scalarization method and simulated annealing algorithm

The single screw extrusion optimal design involves the optimization of six criteria that can be efficiently handled by a weighted Tchebycheff scalarization method. The performance of the method has been analyzed for three different methods to generate weight vectors. The experimental results show that the tested strategies provide similar and reasonable solutions and supply a valuable procedure to identify good trade-offs between conflicting objectives.European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 734205- H2020-MSCA-RISE-2017. The work has also been supported by FCT – Fundação para a Ciência e Tecnologia within the R&D Units Project Scope: UIDB/00319/2020, UIDB/00013/2020 and UIDP/00013/2020 of CMAT-U

Single screw extrusion optimization using the tchebycheff scalarization method

The optimal design of a single screw extrusion (SSE) is a very difficult task since it deals with several conflicting performance indices. Past research to find the optimal SSE design has been successfully conducted by optimization procedures, in particular by multi-objective optimization. Problems with two or more objectives have been addressed by multi-objective evolutionary algorithms that search for the whole set of promising solutions in a single run. Our approach has been guided by the bi-objective optimization problems, using a methodology based on the weighted Tchebycheff scalarization function. The numerical results show that the proposed methodology is able to produce satisfactory results with physical meaning.This work has been supported by FCT – Fundação para a Ciência e Tecnologia within the R&D Units Project Scope: UIDB/00319/2020, UIDB/05256/2020 and UIDP/05256/2020, UIDB/00013/2020 and UIDP/00013/2020 of CMAT-UM, and the European project MSCA-RISE-2015, NEWEX, Reference 734205

Surface Water Microbial Community Response to the Biocide 2,2-Dibromo-3-Nitrilopropionamide, Used in Unconventional Oil and Gas Extraction.

Production of unconventional oil and gas continues to rise, but the effects of high-density hydraulic fracturing (HF) activity near aquatic ecosystems are not fully understood. A commonly used biocide in HF, 2,2-dibromo-3-nitrilopropionamide (DBNPA), was studied in microcosms of HF-impacted (HF+) versus HF-unimpacted (HF-) surface water streams to (i) compare the microbial community response, (ii) investigate DBNPA degradation products based on past HF exposure, and (iii) compare the microbial community response differences and similarities between the HF biocides DBNPA and glutaraldehyde. The microbial community responded to DBNPA differently in HF-impacted versus HF-unimpacted microcosms in terms of the number of 16S rRNA gene copies quantified, alpha and beta diversity, and differential abundance analyses of microbial community composition through time. The differences in microbial community changes affected degradation dynamics. HF-impacted microbial communities were more sensitive to DBNPA, causing the biocide and by-products of the degradation to persist for longer than in HF-unimpacted microcosms. A total of 17 DBNPA by-products were detected, many of them not widely known as DBNPA by-products. Many of the brominated by-products detected that are believed to be uncharacterized may pose environmental and health impacts. Similar taxa were able to tolerate glutaraldehyde and DBNPA; however, DBNPA was not as effective for microbial control, as indicated by a smaller overall decrease of 16S rRNA gene copies/ml after exposure to the biocide, and a more diverse set of taxa was able to tolerate it. These findings suggest that past HF activity in streams can affect the microbial community response to environmental perturbation such as that caused by the biocide DBNPA.IMPORTANCE Unconventional oil and gas activity can affect pH, total organic carbon, and microbial communities in surface water, altering their ability to respond to new environmental and/or anthropogenic perturbations. These findings demonstrate that 2,2-dibromo-3-nitrilopropionamide (DBNPA), a common hydraulic fracturing (HF) biocide, affects microbial communities differently as a consequence of past HF exposure, persisting longer in HF-impacted (HF+) waters. These findings also demonstrate that DBNPA has low efficacy in environmental microbial communities regardless of HF impact. These findings are of interest, as understanding microbial responses is key for formulating remediation strategies in unconventional oil and gas (UOG)-impacted environments. Moreover, some DBNPA degradation by-products are even more toxic and recalcitrant than DBNPA itself, and this work identifies novel brominated degradation by-products formed

Avaliação ambiental do rio mongaguá, sp, utilizando macroinvertebrados bentônicos

Estudar a qualidade ambiental de um corpo d’água leva ao conhecimento da qualidade ambiental do seu entorno. Uma das comunidades biológicas muito estudada, neste sentido, é o grupo dos macroinvertebrados bentônicos, seres com dimensões entre milímetros e centímetros que habitam o sedimento do fundo dos corpos d’água. Segundo a literatura, muitos invertebrados macroscópicos são usados para diagnosticar a saúde de rios e lagos. O presente trabalho buscou compreender a qualidade das águas do Rio Mongaguá, SP, através da análise de parâmetros físicos, químicos e biológicos, utilizando a contagem e identificação de macroinvertebrados bentônicos em dois pontos do Rio Mongaguá, e um terceiro ponto em um afluente localizado na divisa entre Praia Grande e Mongaguá, os pontos foram denominados 1, 2 e 3. Os resultados das análises químicas e físicas demonstraram o pH e turbidez dentro dos valores referências para águas doces de classe 2 da resolução CONAMA 357/05. No ponto 1 foram encontrados organismos Chironomidae, que possuem resistência para sobreviver em águas com baixos níveis de oxigênio. Este ponto apresentava grande quantidade de lixo como garrafas plásticas e restos de alimentos. Não foi possível determinar a qualidade ambiental do ponto 2, pois o único organismo encontrado não foi identificado. Os organismos encontrados no ponto 3, dos grupos Plecoptera, Trichoptera, Ephemeroptera e Lepdoptera, habitam águas limpas com alto índice de oxigênio, podendo-se inferir que, neste ponto, a qualidade da água era boa. &nbsp