Results 21 to 30 of about 7,511 (198)
Acta Scientiarum: Biological Sciences, 2008 A conservação de amostras para a determinação dos valores calóricos em estudos de bioenergética de peixes tem se apresentado, na literatura, com uma variedade de métodos.
Evanilde Benedito-Cecilio +1 more
doaj +1 more source
CALORIMETRIA NO ENSINO FUNDAMENTAL
Revista do Professor de Física, 2018 Este artigo apresenta uma proposta didática para o ensino da calorimetria no Ensino Fundamental, baseada nas potencialidades de uma Sequência de Ensino Investigativa (SEI). De acordo pressupostos teóricos de Piaget (1977; 1978) e Vygotsky (1984), e conforme os encaminhamentos de Carvalho (2012), a presente proposta se justifica pela necessidade de ...
Evaldo Vieira Faria Júnior +3 more
openaire +2 more sources
Journal of Chemistry, Volume 9, Issue 2, Page 938-948, 2012., 2012 We obtain activated carbons with high portion of meso pores using coffee residues as precursor for the application of adsorption of large adsorbates. Because of its natural properties, the coffee residue exhibited a large pore size. In this work, the coffee residue were impregnated with ZnCl2 and KOH, and then carbonized under the nitrogen conditions ...
Liliana Giraldo +1 more
wiley +1 more source
Heavy Metal Ions Adsorption from Wastewater Using Activated Carbon from Orange Peel
Journal of Chemistry, Volume 9, Issue 2, Page 926-937, 2012., 2012 Activated carbon obtained from orange peel (ACOP) was synthesized and used for the removal of heavy metal ions (Cr, Cd, and Co) from aqueous solutions. Two different adsorption models were used for analyzing data. Adsorption capacities were determined: copper ions exhibit the greatest adsorption on activated carbon orange peel because of its size and ...
Juan Carlos Moreno-Piraján +1 more
wiley +1 more source
Journal of Chemistry, Volume 9, Issue 2, Page 780-785, 2012., 2012 Activated carbons (ACs) were prepared by pyrolysis of seeds mango in presence of sodium and potassium hydroxide (chemical activities). Seeds mango from Colombian Mango cultives were impregnated with aqueous solutions of NaOH and KOH following a variant of the incipient wetness method. Different concentrations were used to produce impregnation ratios of
J. C. Moreno-Piraján, L. Giraldo
wiley +1 more source
CONSTRUÇÃO DE UM CALORÍMETRO PARA MEDIÇÃO DE EFICIÊNCIA TÉRMICA NA SOLDAGEM
Holos, 2017 Calorímetro é um sistema utilizado para a medição de transferência de calor. O objetivo do presente trabalho consiste na construção de um calorímetro para medir a eficiência térmica na soldagem que foi desenvolvido nos laboratórios da Faculdade ...
Cristiano Ziegler +2 more
doaj +1 more source
Journal of Chemistry, Volume 9, Issue 2, Page 650-658, 2012., 2012 Activated carbon monoliths disc and honeycomb type were prepared by chemical activation of coconut shell with zinc chloride at different concentrations, without using a binder. The structures were characterized by N2 adsorption at 77 K and immersion calorimetry into benzene.
Juan Carlos Moreno-Piraján +2 more
wiley +1 more source
Thermodynamic and Calorimetric Study of Acetylsalicylic Acid (Aspirin) and Ibuprofen
Journal of Chemistry, Volume 8, Issue 3, Page 1298-1308, 2011., 2011 Enthalpies of solution and dilution of aqueous solutions of sodium acetylsalicylic acid salt and ibuprofen salt were measured with an isoperibolic calorimeter at 293.15 K, 298.15 K, 303.15 K, 308.15 K and 318.15 K. The concentration of the electrolyte was restricted to the solubility of the salt at various temperatures and did not exceed 0.035–0.057 ...
Juan Carlos Moreno-Piraján +2 more
wiley +1 more source
Acta Scientiarum: Biological Sciences, 2007 Avaliação do crescimento corporal e dos neurônios mioentéricos de ratos Wistar após tratamento neonatal com glutamato monossódico. Este trabalho objetivou avaliar como o tratamento neonatal com glutamato monossódico se reflete em parâmetros corporais e ...
Maria Montserrat Dias Pedrosa Furlan +4 more
doaj +1 more source
Synthesis of Fatty Alcohols from Oil Palm Using a Catalyst of Ni‐Cu Supported onto Zeolite
Journal of Chemistry, Volume 7, Issue 4, Page 1138-1147, 2010., 2010 A series of Ni‐Cu supported onto zeolite type ZSM‐5 has been synthesized by direct hydrothermal method without template agent and characterized using XRD, FT‐IR, NRM mass, SEM, CG and N2 adsorption techniques. The catalytic performance of the obtained materials was evaluated and utilized for the hydrogenation of palm oil at 453 K and 40 atmospheres of ...
L. Giraldo +3 more
wiley +1 more source