Chemical Concepts
Mostrando 13-24 de 168 artigos, teses e dissertações.
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13. Best videos of the year for 2019
The aims of the current study are to investigate the composition of biomass from baru processing and to explore the feasibility of valuing it through the development of bioproducts such as fermentable sugars, furanics and biochar. Baru (Dipteryx alata Vog.) waste (endocarp and mesocarp) has great energetic potential to produce bioproducts due to its chemical
Int. braz j urol.. Publicado em: 2020-02
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14. Sustainability of Biorefinery Processes Based on Baru Biomass Waste
The aims of the current study are to investigate the composition of biomass from baru processing and to explore the feasibility of valuing it through the development of bioproducts such as fermentable sugars, furanics and biochar. Baru (Dipteryx alata Vog.) waste (endocarp and mesocarp) has great energetic potential to produce bioproducts due to its chemical
J. Braz. Chem. Soc.. Publicado em: 2020-02
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15. An Overview of the Photocatalytic H2 Evolution by Semiconductor-Based Materials for Nonspecialists
The solar-to-chemical energy conversion is promising to tackle sustainability challenges toward a global future. The production of H2 from sunlight represents an attractive alternative to the use of carboniferous fossil fuels to meet our energy demands. In this context, the water splitting reaction photocatalyzed by semiconductors that can be excited under v
J. Braz. Chem. Soc.. Publicado em: 2020-02
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16. Biochemistry and Renal Function: Use of Inquiry-Based Teaching Sequences for Retrieval of Specific Concepts
RESUMO As propostas de ensino atuais envolvem estratégias de ensino que auxiliam e incentivam a construção do conhecimento, fazendo com que o aluno seja um participante ativo do processo de aprendizagem, e têm sido alvo de diversas pesquisas. Este artigo relata, aula a aula, uma sequência didática realizada com alunos em fase inicial de formação, apl
Rev. bras. educ. med.. Publicado em: 13/01/2020
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17. INTERAÇÕES INTERMOLECULARES E O FENÔMENO DA SOLUBILIDADE: EXPLICAÇÕES DE GRADUANDOS EM QUÍMICA
The present study investigated the use of intermolecular interaction concepts by freshman chemistry students during general chemistry classes, explaining some of the solubility phenomenon. For this purpose, classes on the topic in question were monitored and two tests were asking for explanations for the difference in solubility of oxygen and carbon dioxide
Quím. Nova. Publicado em: 2020-01
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18. Characterization of Austenite Decomposition in Steels with Different Chemical Concepts and High Potential to Manufacture Seamed Pipes for Oil and Gas Industry
This work presents the characterization of austenite decomposition kinetics in two steels during continuous cooling considering non-deformed austenite grains. Two different chemical concepts of steels were evaluated: low carbon - high manganese and a relatively new concept based on low carbon - low manganese - high niobium contents. Dilatometric experiments,
Mat. Res.. Publicado em: 21/10/2019
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19. STUDENTS BUILDING DIDACTIC EXPERIMENTS AS A TOOL FOR TEACHING UNIT OPERATIONS AND PROCESS CONTROL FOR CHEMISTRY TECHNICIANS
The qualified preparation of technician chemistry students who will act directly in the operation and control of industrial chemical plants is a permanent challenge in the teaching-learning process, since such activities require a broad view of the process and a sum of knowledge’s areas such as unit operations, instrumentation and industrial process contro
Quím. Nova. Publicado em: 21/10/2019
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20. CAMBIO EN LOS MODELOS CONCEPTUALES ESCOLARES SOBRE LA INTERACCIÓN MATERIA Y ENERGÍA EN UN ENTORNO CIENCIA TECNOLOGÍA SOCIEDAD Y AMBIENTE
The main goal consisted in the characterization of gradual concepts according to the categories of physical and chemical processes. The first step was to identify preceding notions about this principle of interaction in daily happenings, followed by the implementation of didactic interventions in order to appropriate the concept, and, finally, the determinat
Quím. Nova. Publicado em: 21/10/2019
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21. SENSOR SYSTEMS FOR MAPPING SOIL FERTILITY ATTRIBUTES: CHALLENGES, ADVANCES, AND PERSPECTIVES IN BRAZILIAN TROPICAL SOILS
ABSTRACT Soil fertility attributes have different scales and forms of spatial and temporal variations in agricultural fields. Adequate spatiotemporal characterization of these attributes is fundamental to the successful development of strategies for variable rate application of fertilizers, enabling the classic benefits of precision agriculture (PA). Studies
Eng. Agríc.. Publicado em: 09/09/2019
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22. O ano internacional da tabela periódica e o ensino de química: das cartas ao digital
Proclaimed by UNESCO the International Year of the Periodic Table of Chemical Elements in 2019 (IYPT 2019) will commemorate a remarkable series of important milestones in the history of the periodic table of chemical elements. The periodic table is a valuable instrument for chemistry teaching and their study is important in the development of key chemical co
Quím. Nova. Publicado em: 15/08/2019
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23. Ensino em ciências e educação para o patrimônio: uma fusão metodológica para o ensino de Química, a preservação patrimonial e a alfabetização científica
Resumo: Neste trabalho - que tem foco na contextualização da química e no impacto que essa atividade pode ter na preservação patrimonial e na alfabetização científica - propôs-se, elaborou-se, aplicou-se e avaliou-se uma atividade que objetivou promover o ensino de química por meio do patrimônio cultural ao mesmo tempo em que suscitou a preservaç
Ciênc. educ. (Bauru). Publicado em: 01/07/2019
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24. Field Perception of the Boundary Between Soil and Saprolite by Pedologists and its Differentiation Using Mathematical Models
ABSTRACT Saprolite plays a central role into hydrologic and nutrient cycles. Despite that, saprolite research is scattered and uses heterogeneous, sometimes conflicting, methods and concepts. During field work, it is difficult to assign the boundary between soil and saprolite. This paper aimed to identify the subjacent logic that pedologists use to assign to
Rev. Bras. Ciênc. Solo. Publicado em: 27/06/2019