Results 1 to 10 of about 3,268 (190)

Microondas em síntese orgânica [PDF]

Química Nova, 2002
The application of microwave heating to organic synthesis is presented in a concise manner. Issues such as the history of the microwave oven, dielectric heating, reactions techniques (dry reactions, MORE chemistry), domestic ovens, microwave reactors, microwave effect and control of selectivities are discussed.
Antônio Manzolillo Sanseverino
  +9 more sources

The Impact of Cognitive Anxiety and the Rating of Pain on Care Processes in a Vigilance Task: The Important Part Played by Age [PDF]

Pain Research and Management, Volume 2020, Issue 1, 2020., 2020
Chronic pain is a serious public health problem that has grown exponentially in recent years, which is why it has received the attention of numerous researchers. Most of the studies in the field of chronic pain have focused on care as a mediating variable on the perception of painful stimuli and emotions.
Luis Pinel, Miguel A. Perez-Nieto, Marta Redondo, Luis Rodríguez-Rodríguez, Leticia L. Mateos, Parisa Gazerani   +5 more
wiley   +2 more sources

Green synthesis of biomass-derived carbon quantum dots for photocatalytic degradation of methylene blue [PDF]

Beilstein Journal of Nanotechnology
Water pollution, significantly influenced by the discharge of synthetic dyes from industries, such as textiles, poses a persistent global threat to human health.
Dalia Chávez-García, Mario Guzman, Viridiana Sanchez, Rubén D. Cadena-Nava   +3 more
doaj   +2 more sources

BENZILAÇÃO DO GLICEROL COM AQUECIMENTO POR MICROONDAS

Cadernos de Pesquisa, 2013
A infinidade de aplicações da glicerina incentivou inúmeras pesquisas voltadas ao reaproveitamento do principal coproduto do biodiesel. Destaca-se a produção de aditivos oxigenados para combustíveis, como os éteres, os acetais e os ésteres de glicerina ...
Mitchell González Soares da Silva, Kiany Sirley Brandão Cavalcante, Ulisses Magalhães Nascimento, Antônio Carlos Sales Vasconcelos, Adeilton Pereira Maciel, Fernando Carvalho Silva   +5 more
doaj   +4 more sources

Experimentos didáticos envolvendo radiação microondas [PDF]

Química Nova, 2004
Theoretical and practical aspects of the use of microwave-assisted strategies in chemistry are introduced for students using simple and safe experiments employing a domestic oven. Three procedures are proposed for evaluating the distribution of microwave radiation inside the microwave oven cavity: (1) variation of the volume of marshmallows; (2) drying
Fabiana Rosini, Clésia C. Nascentes, Joaquim A. Nóbrega   +2 more
openalex   +6 more sources

Filmes finos de SrBi2Ta2O9 processados em forno microondas SrBi2Ta2O9 thin films processed in microwave oven [PDF]

Cerâmica, 2003
Filmes finos de SrBi2Ta2O9 foram depositados em substratos de Pt/Ti/SiO2/Si e, pela primeira vez, sinterizados em forno microondas doméstico. Os padrões de difração de raios X mostraram que os filmes são policristalinos.
J. S. Vasconcelos, N. S. L. S. Vasconcelos, S. M. Zanetti, J. W. Gomes, E. Longo, E. R. Leite, J. A. Varela   +6 more
doaj   +2 more sources

Molienda asistida con microondas de un coque metalúrgico

Revista de Metalurgia, 2014
Los coques metalúrgicos están compuestos mayoritariamente de carbono grafítico (s2p2) y diferentes compuestos inorgánicos con distintas capacidades de absorber la radiación de microondas.
Esteban Ruisánchez, Emilio J. Juárez-Pérez, Ana Arenillas, José M. Bermúdez, José Ángel Menéndez   +4 more
doaj   +3 more sources

Caracterização térmica e reológica de borracha de pneu desvulcanizada por microondas Thermal and rheological characterization of ground tire rubber devulcanized by microwaves [PDF]

Polímeros, 2006
Borracha de pneu pós-consumo previamente particulada foi submetida a um tratamento em microondas, de forma a promover a quebra de suas ligações cruzadas, ou seja, sua desvulcanização.
Carlos H. Scuracchio, Daniel A. Waki, Rosario E. S. Bretas   +2 more
doaj   +2 more sources

Síntesis de whiskers de SiC asistida por microondas

Boletín de la Sociedad Española de Cerámica y Vidrio, 2013
We developed a new process for the synthesis of SiC whiskers assisted by microwaves; this is based on the mixture of silica xerogels and graphite powder. As energy source were used microwaves of 2.45 GHz and 1.0 kW of power RMS.
Garza-Méndez, F. J., Vanegas, A. J., Vázquez, B. A., Garza-Paz, J.   +3 more
doaj   +4 more sources

Estimating the future hydric needs of Baja California, Mexico. Assessment of scenarios to stop being a region with water scarcity

Water Supply, 2021
This paper shows the actual conditions of freshwater availability in Baja California (BC), Mexico. It aims to estimate the water needs by 2030, and propose scenarios to move out of the scarce water region classification defined by international ...
A. Cortés-Ruiz, I. Azuz-Adeath
doaj   +1 more source