Chemical and environmental assessment of rejuvenated asphalt mixtures

A reciclagem é um tema que vem ganhando bastante espaço em diversas áreas da engenharia. Quando se reaproveita um material em obras civis, indiretamente se está contribuindo para a preservação da natureza. Dentro deste contexto, a reciclagem de revestimentos asfálticos é um assunto que desperta grande interesse, mas que requer estudos mais aprofundados. Desta forma, o presente trabalho tem como objetivo estudar os efeitos de produtos rejuvenescedores no comportamento de ligante asfáltico envelhecido, visando sua aplicação em reciclagem de revestimentos de pavimentos rodoviários. Para tanto, inicialmente foi extraído ligante residual e em seguida foram adicionados rejuvenescedores a base de alcatrão (RejuvaSeal) e outros a base de óleo de xisto, conhecidos comercialmente com AR-5, AR-250 e AR-500, nas taxas de 15, 20 e 25%, de modo a verificar qual teor seria apropriado para recuperar as características originais do ligante. Entre as diversas conclusões obtidas neste trabalho tem-se que a mistura contendo 20% de AR-5 apresenta o melhor comportamento quando comparada a um ligante asfáltico novo (CAP 50-70). As análises químicas e ambientais mostraram que a reciclagem de material fresado de revestimento asfáltico utilizando rejuvenescedor é uma solução tecnicamente possível e ambientalmente correta para pavimentação.Recycling is a topic that has been gaining enough space in various areas of engineering. When reuses material in civil works, indirectly it is contributing to the preservation of nature. Within this context, the recycling of asphalt coatings is a subject that arouses great interest, but that requires further study. Thus, this paper aims to study the effects of rejuvenating products on aged asphalt binder behavior, for their application in recycling road surface coatings. Therefore, it was initially extracted residual binder and then were added rejuvenating tar base (RejuvaSeal) and other shale oil based commercially known AR-5, AR-250 and AR500, at rates of 15, 20 and 25%, in order to see which content would be appropriate to recover the original characteristics of the binder. Among the many findings from this study is that the mixture containing 20% of AR-5 shows better behavior when compared to a new asphalt binder (CAP 50-70). The chemical and environmental analysis showed that the recycling of material milled using rejuvenating asphalt layer is a technically feasible solution for flooring and environmentally friendly

Avaliação química e ambiental de misturas asfálticas rejuvenescidas

A reciclagem é um tema que vem ganhando bastante espaço em diversas áreas da engenharia. Quando sereaproveita um material em obras civis, indiretamente se está contribuindo para a preservação da natureza.Dentro deste contexto, a reciclagem de revestimentos asfálticos é um assunto que desperta grande interesse,mas que requer estudos mais aprofundados. Desta forma, o presente trabalho tem como objetivo estudar osefeitos de produtos rejuvenescedores no comportamento de ligante asfáltico envelhecido, visando sua aplicaçãoem reciclagem de revestimentos de pavimentos rodoviários. Para tanto, inicialmente foi extraído liganteresidual e em seguida foram adicionados rejuvenescedores a base de alcatrão (RejuvaSeal) e outros a base deóleo de xisto, conhecidos comercialmente com AR-5, AR-250 e AR-500, nas taxas de 15, 20 e 25%, de modoa verificar qual teor seria apropriado para recuperar as características originais do ligante. Entre as diversasconclusões obtidas neste trabalho tem-se que a mistura contendo 20% de AR-5 apresenta o melhor comportamentoquando comparada a um ligante asfáltico novo (CAP 50-70). As análises químicas e ambientaismostraram que a reciclagem de material fresado de revestimento asfáltico utilizando rejuvenescedor é umasolução tecnicamente possível e ambientalmente correta para pavimentação.Palavras-chave: ligantes asfálticos rejuvenescidos, análise química, análise ambienta

CURRÍCULO E DIFERENÇAS ÉTNICO-RACIAIS NA EDUCAÇÃO BÁSICA:: para além da Semana da Consciência Negra

O presente artigo propõe uma reflexão sobre educação para as relações étnico-raciais a partir da perspectiva das diversidades e das diferenças no currículo da educação básica em um momento do calendário cívico da Escola de Educação Básica Profª Maria do Carmo de Souza em Palhoça/SC. Este  movimento aconteceu na Semana da Consciência Negra em 2021 e envolveu a participação de vários docentes, de diferentes componentes curriculares que de maneira experimental fizeram uma tentativa de implementação da lei 10.639/2003 bem como da educação para as relações étnico-raciais nesta escola. Ao mesmo tempo, discute a importância fundamental do currículo multiétnico e plural, com ênfase no projeto político pedagógico da escola

Ensiling of Forage Crops in Semiarid Regions

Edaphoclimatic condition of the semiarid region is unfavorable for the forage production of livestock. Silage is considered a better alternative to conserve forage crops. Ensiling is a technique for preserving forage, in which the ensiled mass is acidified under anaerobic conditions. The lactic acid bacteria present in the environment produce lactic acid, thereby making the environment acidic, and convert soluble substrates into organic acids. Many microorganisms are involved in the fermentation process of silage and their development depends on the characteristics of ensiled materials, such as dry matter, water-soluble carbohydrate content, buffering capacity and presence of indigenous microbial. Ensiling is a favorable technque used in the semiarid region because it preserves the nutritional values of the crops and the water. Some plant species are produced in semiarid regions because they are resistant to water deficit and high solar radiation. The main crops of semiarid regions are sorghum, pearl millet, grasses, cactus pear, and leguminous. Due to agronomic conditions available for their production during periods of rain, for ensiling these plants are important for the fermentation profile of each species because the ratio of the dry matter to water-soluble carbohydrate content and buffering capacity directly influence the end product of silage

Gas exchanges and water-use efficiency of Nopalea cochenillifera intercropped under edaphic practices

The Nopalea forage cactus (Nopalea cochenillifera) is the main xerophilic species cultivated in Brazil, highlighted as a compatible biological element with the semiarid environment. However, studies on its physiological aspects are still scarce. In this context, an experiment was performed in the Pendência Experimental Station, belonging to the State Company of Agricultural Research of Paraíba (EMEPA-PB), municipality of Soledade, state of Paraíba, Brazil, aiming to evaluate the gas exchanges and the water-use efficiency of intercropped Nopalea Cochenillifera plants in the soil under different edaphic managements. The treatments were distributed in randomized blocks, with three replications in a 2 × 5 factorial scheme, corresponding to the soil without and with mulch and five types of cultivation of Nopalea forage cactus, in monoculture and intercropped with forage watermelon, millet, sorghum, and buffelgrass. The analyzed variables were: stomatal conductance, transpiration rate, net photosynthesis rate, and internal CO2 concentration, besides the instantaneous water-use efficiency, intrinsic water-use efficiency, and instantaneous carboxylation efficiency. The use of soil mulch satisfactorily increased the photosynthetic rate of the forage cactus; this type of practice can aid in the productive development of the crop in semiarid zones, whereas the intercropping with buffelgrass and forage watermelon stimulated photosynthesis and the water-use efficiency.The Nopalea forage cactus (Nopalea cochenillifera) is the main xerophilic species cultivated in Brazil, highlighted as a compatible biological element with the semiarid environment. However, studies on its physiological aspects are still scarce. In this context, an experiment was performed in the Pendência Experimental Station, belonging to the State Company of Agricultural Research of Paraíba (EMEPA-PB), municipality of Soledade, state of Paraíba, Brazil, aiming to evaluate the gas exchanges and the water-use efficiency of intercropped Nopalea Cochenillifera plants in the soil under different edaphic managements. The treatments were distributed in randomized blocks, with three replications in a 2 × 5 factorial scheme, corresponding to the soil without and with mulch and five types of cultivation of Nopalea forage cactus, in monoculture and intercropped with forage watermelon, millet, sorghum, and buffelgrass. The analyzed variables were: stomatal conductance, transpiration rate, net photosynthesis rate, and internal CO2 concentration, besides the instantaneous water-use efficiency, intrinsic water-use efficiency, and instantaneous carboxylation efficiency. The use of soil mulch satisfactorily increased the photosynthetic rate of the forage cactus; this type of practice can aid in the productive development of the crop in semiarid zones, whereas the intercropping with buffelgrass and forage watermelon stimulated photosynthesis and the water-use efficiency

Análisis Sedimentológico y geomorfológico de áreas lacustres en la Península Fildes, Isla Rey Jorge, Antártica Marítima

Geomorphological features and sedimentary characteristics are analized from five sets of shallow sediment cores collected in lakes in the Fildes Peninsula, King George Island. The geomorphology of the area was observed and sediments samples were obtained at field activities during the XXXI Brazilian Antarctic Operation (March-April/2013). Biogeochemical characteristics, physical parameters, mineralogical composition, particle size distribution, macroscopic characteristics of the sediments and satellite images were analized. Preliminary results indicate climatic and environmental changes in north-south transect of the peninsula. The mineralogical composition is associated with geological structure of the area, where basaltic rocks predominate. The particle size variation reflects different sediment source environments. Macroscopic analysis and mineralogical composition variation reflect the action of weathering along the peninsula. The sediments also have potential mineralization and subsequent release of greenhouse gases. A preliminary map of the classification of the lakes is presented. In addition, it was identified that wetland sediment presents methane production rates (CH4) about 40 times larger and more sensitive to the effect of global warming compared to lake sediment. Subpolar aquatic ecosystems sediments from Maritime Antarctica can be a preferential site for the effects of climate variability

Arboreto do Ceplac – espécies arbóreas potenciais ao sistema agrossilvicultural cacaueiro

Arboreto é uma área destinada ao cultivo de uma coleção de árvores, arbustos, plantas herbáceas, medicinais, ornamentais ou outras, mantidas e ordenadas cientificamente, documentadas e identificadas; é aberto ao público com a finalidade de educação, pesquisa, material didático e fornecimento de sementes. A Ceplac possui três arboretos instalados em regiões ecologicamente distintas do estado da Bahia: Estação Ecológica Pau-Brasil (Espab), no município de Porto Seguro; Estação Experimental Arnaldo Medeiros (Esarm), no município de Ilhéus; Estação Sósthenes de Miranda (Esomi), localizada no recôncavo baiano. Esses arboretos têm por objetivos principais manter uma coleção viva de espécies arbóreas de interesse à cacauicultura; proteção ex situ e in situ; permitir a avaliação do comportamento para subsidiar o manejo adequado de árvores ao sistema de proteção de topo (sombreamento), que proporciona conforto térmico ao cacaueiro, bem como, programas e ações de recomposição de áreas e de florestas degradadas na Região Cacaueira da Bahia. Onze espécies arbóreas nativas, de interesse econômico, ecológico e social, que compõem o arboreto da Esarm, estão sendo trabalhadas visando à conservação produtiva e ao aumento da riqueza de espécie no sistema de proteção de topo: Dalbergia nigra (jacarandá-da-bahia), Swietenia macrophylla (mogno), Centrolobium tomentosum (putumuju-piloso), Arapatiella psilophylla (arapati), Gallesia integrifolia (pau-d’alho), Lecythis pisonis (sapucaia), Blepharocalyx salicifolius (murta), Genipa americana (jenipapo), Terminalia brasiliensis (araçá-d’agua), Joannesia princeps (dandá boleira) e Plathymenia foliolosa (vinhático). Palavras-chave: Sistema agroflorestal. SAF. Árvore nativa. Cacau-cabruca. Mata Atlântica.

Identification of earlier predictors of pregnancy complications through wearable technologies in a Brazilian multicentre cohort : Maternal Actigraphy Exploratory Study I (MAES-I) study protocol

Introduction Non-invasive tools capable of identifying predictors of maternal complications would be a step forward for improving maternal and perinatal health. There is an association between modification in physical activity (PA) and sleep–wake patterns and the occurrence of inflammatory, metabolic, pathological conditions related to chronic diseases. The actigraphy device is validated to estimate PA and sleep–wake patterns among pregnant women. In order to extend the window of opportunity to prevent, diagnose and treat specific maternal conditions, would it be possible to use actigraphy data to identify risk factors for the development of adverse maternal outcomes during pregnancy? Methods and analysis A cohort will be held in five centres from the Brazilian Network for Studies on Reproductive and Perinatal Health. Maternal Actigraphy Exploratory Study I (MAES-I) will enrol 400 low-risk nulliparous women who will wear the actigraphy device on their wrists day and night (24 hours/day) uninterruptedly from 19 to 21 weeks until childbirth. Changes in PA and sleep–wake patterns will be analysed throughout pregnancy, considering ranges in gestational age in women with and without maternal complications such as pre-eclampsia, preterm birth (spontaneous or provider-initiated), gestational diabetes, maternal haemorrhage during pregnancy, in addition to perinatal outcomes. The plan is to design a predictive model using actigraphy data for screening pregnant women at risk of developing specific adverse maternal and perinatal outcomes

Formação de professores de educação física: análise da revista Movimento

Objetivo: O objetivo desta investigação foi analisar os estudos publicados na Revista Movimento que reportam a formação inicial e continuada de professores de Educação Física. Métodos: O estudo se caracteriza como uma pesquisa documental, sendo utilizada como fonte de dados a Revista Movimento, determinando como palavras chaves para a busca: Formação Inicial e Formação Continuada. Para a análise dos estudos foi utilizado análise de conteúdo, por meio de três etapas: pré-análise, codificação e categorização, em que foram criadas categorias de análise como o ano de publicação, o tipo de estudo e os principais resultados. Resultados: Na busca inicial foram encontrados 95 artigos, sendo 55 no descritor formação inicial e 28 na formação continuada a partir do ano de 2004. Para a análise final foram selecionados 36 estudos com foco a formação do professor de Educação Física. Conclusão: Destaca-se a formação inicial e continuada de professores como uma temática emergente para novas investigações, apresentando o estágio curricular como foco de pesquisa. ABSTRACT. Training of teachers of physical education: analysis of Movement Journal. Objective: The objective of this research was to analyze the studies published in the Movement Journal that report the initial and continuous training of Physical Education teachers. Methods: The study is characterized as a documentary research, being used as data source the Movement Journal, determining as key words for the search: Initial Formation and Continued Formation. For the analysis of the studies, content analysis was used through three steps: pre-analysis, coding and categorization, in which categories of analysis were created, such as the year of publication, the type of study and the main results. Results: In the initial search, 95 articles were found, being 55 in the initial training descriptor and 28 in the continuous training from the year 2004. For the final analysis, 36 studies were selected with focus the formation of the teachers of Physical Education. Conclusion: It is important to emphasize the initial and continuous formation of teachers as an emerging theme for new investigations, presenting the curricular internship as a research focus

Occurrence of pests and diseases in cactus pear genotypes / Ocorrência de pragas e doenças em genótipos de palma forrageira

The objective was to evaluate the occurrence of pests, diseases and mortality rate in nine genotypes of cactus pear (Nopalea cochenillifera) destined for forage production. The genotypes were implanted in a complete randomized block design, with nine treatments and three replications. After 330 days of cultivation, the occurrence of pests and diseases and verification of plant mortality were carried out. Among all the pests and diseases observed in this experimental trial, the most prevalent disease regardless of the evaluated genotype was the anthracnose stain “Colletotrichum gloeosporioides” (49.20%) and the less frequent diseases were the resine “Dothiorella ribis” (6.87%) and soft rot “Erwinia carotovora” (2.58%). The only occurrence pest was the cochineal in scales “Diaspis echinocacti” (22.69%). The Texas (V13) and Negro Michoacan (F07) genotypes showed the highest occurrence of pests and diseases, from 50% of the total plants, followed by anthracnose stain and cochineal in scales. On the contrary, the genotypes Tamazunchale (V12) and California (V14) were not affected by any pest or disease. It was observed that the genotypes Nopalea Uruapan (V20) and Blanco San Pedro (V19), had a lower occurrence of pests and diseases, less than 20% of the total plants. The genotypes that presented the highest mortality rate were Texas (V13), Blanco San Pedro (V19) and Polotitlan (V09), with 80, 70 and 65% mortality rate, respectively. The genotypes Nopalea Uruapan (V20) and California (V14) had the lowest mortality rate (20 and 35%), respectively. The genotypes that were least affected by pests and diseases and had the lowest mortality rate are Tamazunchale (V12), California (V14) and Nopalea Uruapan (V20)