This research examined the influence of the compositions between coconut fiber (Cocos nucifera) and wood particles (Pinus taeda L. and Eucalyptus saligna) on physico-mechanical properties of homogeneous particleboards. The exploratory study was carried out under Tukey’s contrast test of means, at 5% significance level, with the following compositions: 100% coconut fiber (F100 P0 E0); 50% coconut fiber, 25% pine particles, and 25% eucalyptus particles (F50 P25 E25); and 50% of pine particles and 50% of eucalyptus particles (F0 P50 E50), with particle moisture content between 0% to 2% and 10%, in mass, of polyurethane-castor oil (PU-Castor) resin. Three panels were produced for each composition. The physico-mechanical properties such as density, moisture content, swelling in thickness after 24 h of immersion in water, perpendicular tensile strength, static bending strength, and modulus of elasticity were evaluated using standard methods. The results obtained indicated the potential for using coconut fiber for the production of homogeneous particleboards in view of the minimum criteria required by the normative documents, with emphasis on the physical property of swelling after 24 hours, which obtained a statistically equivalent average relative to the treatment that contained only wood particles.
This research evaluated the possible use of tropical hardwood species (Myrocarpus frondosus and Ocotea porosa) for grilling plank production. Physical, chemical, and organoleptic properties were evaluated and compared with properties of a well-used wood species for grilling planks, western red cedar (Thuja plicata). For chemical analysis, one technique was used: hydrodistillation. Normality tests and analyses of variance (ANOVA) were used for the comparisons between Thuja plicata and tropical hardwoods. The results of the organoleptic, chemical, and statistical analyses demonstrated the possibility of using Myrocarpus frondosus and Ocotea porosa in grilling plank production.
The objective of this research is to evaluate the possibility of use of tropical hardwood species (Amburana cearensis and Cedrella fissilis) for grilling plank production. Physical, chemical and organoleptic properties were evaluated and compared with properties of a well-used wood specie for grilling plank across Europe and USA, Western Red Cedar (Thuja plicata). For chemical analysis, three techniques were used: hydro distillation, soxhlet and head space. Normality test and analysis of variance (ANOVA) were used for the comparison between Thuja plicata and tropical hardwoods. The results of organoleptic, chemical and statistical analysis demonstrated the possibility of use of Amburana cearensis and Cedrella fissilis on grilling plank production, with no volatile compound present in these species being toxic, low apparent density and Nerolidol presence, chemical compound used as flavoring agent, enabling their use as grilling planks.
The world experienced several economic, social and environmental transformations during the COVID-19 pandemic, and today, society assesses all these changes in the different stages of the pandemic process. In this sense, this research aimed to evaluate the educational and environmental impacts on the academic community of the largest educational institution in the Brazilian Amazon. The perception of the quality of teaching of undergraduate and graduate engineering students during remote teaching was assessed by means of an exploratory research work carried out at the Federal University of Pará (Brazil). Ecological and carbon footprint indicators were also measured through the Global Footprint Network®. In social terms, students pointed to a reduction in the quality of teaching. Despite the incentives through institutional initiatives for both students and professors, the community was not prepared to fully migrate to the virtual world, and that made the teaching–learning process difficult. In environmental terms, the reduction in the ecological footprint that was observed could have reached values higher than those that were found, to the order of 2.33%, with the mobility sector achieving the greatest reduction.
RESUMO A escassez dos recursos florestais integrada à necessidade de aquisição de produtos mais ecológicos demanda o uso de outros tipos de biomassa, além da madeira no setor construtivo. Diante disso, o mesocarpo do dendê - resíduo oriundo da agroindústria e com grande potencial de utilização para desenvolvimento de novos materiais - surge como alternativa na elaboração de painéis lignocelulósicos em substituição ao MDF (medium density fiberboard) convencionalmente utilizado. Dessa forma, o presente trabalho demonstrou a viabilidade da produção e a integridade estrutural desse tipo de painel na fabricação de elementos construtivos a serem empregados na construção civil, mediante estudo comparativo entre suas propriedades com as de painéis de MDF. A metodologia consistiu na realização de ensaios de caracterização dos painéis, por meio da determinação de suas propriedades físicas (absorção de água, inchamento e densidade) e mecânicas (resistência à flexão e módulo de elasticidade), além da morfologia dos painéis produzidos, mediante a técnica de microscopia eletrônica de varredura (MEV), análise química (por meio do espectro de infravermelho com transformada de Fourier) e térmica, por meio de curvas termogravimétricas e derivada. Dos resultados obtidos, tem-se que a produção desses painéis sem aglutinantes, obtidos pela incorporação do mesocarpo de dendê, agrega valor à cadeia produtiva do dendê, além de surgir como alternativa aos desafios inerentes à produção tradicional dos painéis de madeira e, consequentemente, como opção de elemento construtivo a ser integrado à construção civil.
Resumo Atender aos requisitos dos clientes é primordial para qualquer empresa ou indústria, uma vez que entregar aos clientes o produto que eles desejam é a sua razão de existir. Nos projetos habitacionais, compreender e traduzir tais requisitos em atributos de projeto visa buscar a total satisfação dos clientes e garantir vantagem competitiva. Para tanto, metodologias baseadas em aspectos qualitativos vêm sendo desenvolvidas, ainda assim, estas apresentam limitações quanto à garantia da qualidade dos produtos imobiliários. Com o intuito de propor um modelo para hierarquizar requisitos resultados de pesquisas de satisfação, baseado em aspectos quantitativos, este trabalho se dispôs a analisar um banco de dados composto por pesquisas de satisfação de empreendimentos habitacionais de padrões econômicos distintos. Foram empregadas análises das medidas de tendência central e dispersão, determinação da confiabilidade por meio do Alpha de Cronbach e análise fatorial. Pôde-se constatar que a principal ferramenta capaz de atender aos objetivos é a análise fatorial, sendo os aspectos construtivos com maior possibilidade de fornecer satisfação aos clientes aqueles relacionados a tamanho, qualidade, funcionalidade e conforto.
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