5 research outputs found
Análise da resistividade de estruturas de concreto submetidas ao ataque corrosivo de sulfato de magnésio
O estudo do comportamento do concreto diante ao ataque de íons sulfatos, pode ser descrito por meio de ensaios acelerados que, além do rígido controle das invariáveis intervenientes no processo, no que diz respeito à qualidade dos materiais envolvidos, na dosagem dos agregados e do aglomerante, controle na etapa de cura do concreto, oferece baixo custo e certa velocidade na coleta de dados. Busca-se ao máximo estender a durabilidade das estruturas visando diminuir custos com reparos e manutenções ao longo da vida útil da mesma. Uma boa maneira de se chegar a resultados satisfatórios é na escolha certa dos materiais a serem utilizados buscando as características necessárias para resistir às ações a qual a edificação estará submetida. Neste trabalho, busca-se orientar e propor uma descrição do mecanismo de ataque do agente agressor, para elaboração de projetos, as diferentes formas em que o Sulfato de Magnésio pode entrar em contato com o concreto, e também comprovar a relevância da relação água/cimento (a/c) e comparar a resistividade entre dois tipos de cimento, onde constatou a melhor eficiência do cimento CPIII RS - 40, comparado ao cimento CPII E 32, quando ambos submetidos às mesmas condições de agressividade, em ensaios de corrosão acelerada
Telessimulação sobre visita domiciliar e cuidado infantil: facilidades, barreiras e percepções de estudantes de enfermagem
Objetivo: evaluar las facilidades, barreras y percepciones de estudiantes de enfermería en el aprendizaje sobre visita domiciliaria y cuidado infantil por telesimulación en la pandemia de COVID-19. Método: estudio cualitativo que evalúa la telesimulación por computadora, basado en el modelo teórico de Kolb. Se aplicó un cuestionario semiestructurado y la Escala de Satisfacción de los Estudiantes y Autoconfianza en el Aprendizaje, con análisis descriptivo y análisis temático cualitativo sobre las percepciones de 41 estudiantes de enfermería. Resultados: la telesimulación contextualizada brindó oportunidades de aprendizaje en los aspectos estrategia pedagógica, escenario telesimulado, comunicación y especificidades del cuidado infantil en visitas domiciliarias. Es una actividad segura y dinámica, que contribuyó a consolidar conocimientos y actitudes reflexivas, permitió un acercamiento a la realidad, el desarrollo de la interacción, observación y tipos de acercamientos. Hubo restricciones por fallas en la conexión. La mayoría de los estudiantes indicaron buenos niveles de satisfacción y confianza en sí mismos con el aprendizaje en la escala aplicada. Conclusión: la situación clínica real con participación a distancia permitió la observación, toma de decisiones, reflexión y elaboración de conclusiones inherentes al ciclo de aprendizaje experiencial. El conjunto de elementos de esta telesimulación creó un ambiente que estimuló el interés de los estudiantes de enfermería por otras etapas de aprendizaje, por lo que se considera un espacio que fortalece el conocimiento y dialoga con las prácticas presenciales.Objective: to evaluate the facilitators, barriers and perceptions of Nursing students in learning about home visiting and child care through Telesimulation during the COVID-19 pandemic. Method: a qualitative study to evaluate Telesimulation via computers, grounded on Kolb’s theoretical model. A semi-structured questionnaire and the Student Satisfaction and Self-Confidence in Learning Scale were applied, with descriptive analysis and qualitative thematic analysis on the perceptions of 41 Nursing students. Results: the contextualized Telesimulation provided learning opportunities in dimensions of the pedagogical strategy, telesimulated scenario, communication and specificities of child care in home visits. It was considered a safe and dynamic activity that helped knowledge consolidation and reflective attitudes, proximity to reality, and develop interaction, observation and types of approaches. There were restrictions due to Internet connection failures. A large percentage of the students indicated good satisfaction and self-confidence level with learning in the scale applied. Conclusion: the real clinical situation with remote immersion allowed observation, decision-making, reflection and elaboration of conclusions, inherent to the experiential learning cycle. The set of elements of this Telesimulation created an environment that stimulated the interest of Nursing students for other learning stages, suggesting a space that strengthens knowledge and maintains dialogue with face-to-face practices.Objetivo: avaliar as facilidades, barreiras e percepções de estudantes de enfermagem na aprendizagem sobre visita domiciliar e cuidado infantil por telessimulação na pandemia da COVID-19. Método: estudo qualitativo avaliativo de telessimulação por computador, fundamentado no modelo teórico de Kolb. Foram aplicados um questionário semiestruturado e a Escala de Satisfação de Estudantes e Autoconfiança na Aprendizagem, com análise descritiva e análise qualitativa temática sobre percepções de 41 graduandos de enfermagem. Resultados: a telessimulação contextualizada proporcionou oportunidades de aprendizagem em dimensões da estratégia pedagógica, cenário telessimulado, comunicação e especificidades do cuidado infantil em visita domiciliar. Atividade segura e dinâmica, auxiliou a solidificar conhecimentos e atitudes reflexivas, aproximação à realidade, desenvolvimento da interação, observação e tipos de abordagens. Houve restrições por falhas de conexão. Grande parte dos estudantes indicou níveis bons de satisfação e autoconfiança com a aprendizagem na escala aplicada. Conclusão: a situação clínica real com imersão remota permitiu observação, tomada de decisão, reflexão e elaboração de conclusões inerentes ao ciclo de aprendizagem experiencial. O conjunto de elementos desta telessimulação criou um ambiente que estimulou o interesse dos estudantes de enfermagem para outras etapas de aprendizagem, sugerindo um espaço que fortalece conhecimentos e que guarda interlocução com as práticas presenciais
ATLANTIC EPIPHYTES: a data set of vascular and non-vascular epiphyte plants and lichens from the Atlantic Forest
Epiphytes are hyper-diverse and one of the frequently undervalued life forms in plant surveys and biodiversity inventories. Epiphytes of the Atlantic Forest, one of the most endangered ecosystems in the world, have high endemism and radiated recently in the Pliocene. We aimed to (1) compile an extensive Atlantic Forest data set on vascular, non-vascular plants (including hemiepiphytes), and lichen epiphyte species occurrence and abundance; (2) describe the epiphyte distribution in the Atlantic Forest, in order to indicate future sampling efforts. Our work presents the first epiphyte data set with information on abundance and occurrence of epiphyte phorophyte species. All data compiled here come from three main sources provided by the authors: published sources (comprising peer-reviewed articles, books, and theses), unpublished data, and herbarium data. We compiled a data set composed of 2,095 species, from 89,270 holo/hemiepiphyte records, in the Atlantic Forest of Brazil, Argentina, Paraguay, and Uruguay, recorded from 1824 to early 2018. Most of the records were from qualitative data (occurrence only, 88%), well distributed throughout the Atlantic Forest. For quantitative records, the most common sampling method was individual trees (71%), followed by plot sampling (19%), and transect sampling (10%). Angiosperms (81%) were the most frequently registered group, and Bromeliaceae and Orchidaceae were the families with the greatest number of records (27,272 and 21,945, respectively). Ferns and Lycophytes presented fewer records than Angiosperms, and Polypodiaceae were the most recorded family, and more concentrated in the Southern and Southeastern regions. Data on non-vascular plants and lichens were scarce, with a few disjunct records concentrated in the Northeastern region of the Atlantic Forest. For all non-vascular plant records, Lejeuneaceae, a family of liverworts, was the most recorded family. We hope that our effort to organize scattered epiphyte data help advance the knowledge of epiphyte ecology, as well as our understanding of macroecological and biogeographical patterns in the Atlantic Forest. No copyright restrictions are associated with the data set. Please cite this Ecology Data Paper if the data are used in publication and teaching events. © 2019 The Authors. Ecology © 2019 The Ecological Society of Americ
NEOTROPICAL ALIEN MAMMALS: a data set of occurrence and abundance of alien mammals in the Neotropics
Biological invasion is one of the main threats to native biodiversity. For a species to become invasive, it must be voluntarily or involuntarily introduced by humans into a nonnative habitat. Mammals were among first taxa to be introduced worldwide for game, meat, and labor, yet the number of species introduced in the Neotropics remains unknown. In this data set, we make available occurrence and abundance data on mammal species that (1) transposed a geographical barrier and (2) were voluntarily or involuntarily introduced by humans into the Neotropics. Our data set is composed of 73,738 historical and current georeferenced records on alien mammal species of which around 96% correspond to occurrence data on 77 species belonging to eight orders and 26 families. Data cover 26 continental countries in the Neotropics, ranging from Mexico and its frontier regions (southern Florida and coastal-central Florida in the southeast United States) to Argentina, Paraguay, Chile, and Uruguay, and the 13 countries of Caribbean islands. Our data set also includes neotropical species (e.g., Callithrix sp., Myocastor coypus, Nasua nasua) considered alien in particular areas of Neotropics. The most numerous species in terms of records are from Bos sp. (n = 37,782), Sus scrofa (n = 6,730), and Canis familiaris (n = 10,084); 17 species were represented by only one record (e.g., Syncerus caffer, Cervus timorensis, Cervus unicolor, Canis latrans). Primates have the highest number of species in the data set (n = 20 species), partly because of uncertainties regarding taxonomic identification of the genera Callithrix, which includes the species Callithrix aurita, Callithrix flaviceps, Callithrix geoffroyi, Callithrix jacchus, Callithrix kuhlii, Callithrix penicillata, and their hybrids. This unique data set will be a valuable source of information on invasion risk assessments, biodiversity redistribution and conservation-related research. There are no copyright restrictions. Please cite this data paper when using the data in publications. We also request that researchers and teachers inform us on how they are using the data