Intraparticle diffusion model to determine the intrinsic kinetics of ethyl levulinate synthesis promoted by Amberlyst-15
Sign Up to like & getrecommendations! Published in 2020 at "Chemical Engineering Science"
DOI: 10.1016/j.ces.2020.115974
Abstract: Abstract Levulinic acid and its esters are considered very versatile chemical compounds used for a wide range of derivatives. Traditionally ethyl levulinate is synthesized in batch reactors, using homogeneous catalysts (H2SO4, H3PO4). Several investigations were… read more here.
Keywords: model determine; ethyl levulinate; intraparticle diffusion; diffusion model ... See more keywords
A new model to determine the shear modulus and Poisson's ratio of shock-compressed metals up to the melting point
Sign Up to like & getrecommendations! Published in 2021 at "High Pressure Research"
DOI: 10.1080/08957959.2021.1976775
Abstract: ABSTRACT In this paper, using the few-parametric equation of state, an approach is implemented to the calculation of the longitudinal and bulk sound speeds, as well as the elastic moduli of a number of isotropic… read more here.
Keywords: shear modulus; new model; model determine; poisson ratio ... See more keywords
A Simple Model to Determine the Efficient Duration of Exams
Sign Up to like & getrecommendations! Published in 2021 at "Educational and Psychological Measurement"
DOI: 10.1177/0013164420963163
Abstract: This study develops a theoretical model for the costs of an exam as a function of its duration. Two kind of costs are distinguished: (1) the costs of measurement errors and (2) the costs of… read more here.
Keywords: model determine; duration; time; model ... See more keywords
Structural Model to Determine the Factors That Affect the Quality of Emergency Teaching, According to the Perception of the Student of the First University Courses
Sign Up to like & getrecommendations! Published in 2021 at "Sustainability"
DOI: 10.3390/su13052945
Abstract: A quantitative study was conducted in order to know, from the perspective of university students, the relationship between the quality perceived (QP) during the period of confinement derived from the SARS-CoV-2 virus, with the variables… read more here.
Keywords: student; quality; structural model; perception ... See more keywords