Juan Jesús Calvente Calvente - Academia.edu (original) (raw)
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Università degli Studi di Firenze (University of Florence)
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Papers by Juan Jesús Calvente Calvente
Journal of the Science of Food and Agriculture, 1996
Page 1. J Sci Food Agric 1996,12,435-447 Sensory Authentication of European Extra-Virgin Olive Oi... more Page 1. J Sci Food Agric 1996,12,435-447 Sensory Authentication of European Extra-Virgin Olive Oil Varieties by Mathematical Procedures Ramon Aparicio,"* Juan J Calventeb and Maria T Morales" a Instituto de la Grasa, Avda ...
The Canadian Journal of Chemical Engineering, 2011
Densities and refractive indices of binary mixtures of isopropylethanoate with several symmetrica... more Densities and refractive indices of binary mixtures of isopropylethanoate with several symmetrical hydrocarbons viz cyclohexane, benzene, 1,4-dimethylbenzene and 1,3,5-trimethylbenzene at 308.15 K have been measured. The excess molar volumes (V E) are evaluated from the measured density values for the four binary systems. Experimental refractive indices are used to evaluate deviation in refractive indices (n) and molar refraction at experimental temperature. V E values are positive for the mixtures studied except binary mixtures between ester and 1,4-dimethylbenzene which have negative V E values. Standard deviations (V E) and (n) are also reported. Results are discussed in terms of molecular interactions between the components of the mixtures. Nous avons mesuré les densités et les indices de réfraction de mélanges binaires d'isopropyléthanoate avec plusieurs hydrocarbures symétriques, soit du cyclohexane, du benzène, du 1,4-diméthylbenzène et du 1,3,5-triméthylbenzèneà 308,15 K. Les volumes molaires excédentaires (V E) ont etéévaluésà partir des densités mesurées pour les quatre systèmes binaires. Les indices expérimentaux de réfraction ont serviàévaluer l'écart des indices de réfraction (n) ainsi que la réfraction molaireà la température expérimentale. Les valeurs des VEétaient positives pour les mélangeś etudiésà l'exception des mélanges binaires d'ester et de 1,4-diméthylbenzène qui présentaient des valeurs des VE négatives. Lesécarts type (V E) et (n) sontégalement indiqués. La discussion des résultats porte sur les interactions moléculaires entre les composants des mélanges.
Analytica Chimica Acta, 1995
A fuzzy filter has been defined to partially eliminate interference between membership grade func... more A fuzzy filter has been defined to partially eliminate interference between membership grade functions for the cases of absence and presence of uncertainty in input data. A functional study allowed us to analyse the effects on the qualified response of parameters involved in its definition, and hence choose the optimum values for them. Two applications concerning the authentication and sensory evaluation of olive oil are presented. Furthermore, the study reveals that its implementation in more general and sophisticated techniques is a straightforward matter, it being very appropriate for the pre-processing of fuzzy data.
Journal of the Science of Food and Agriculture, 1996
Page 1. J Sci Food Agric 1996,12,435-447 Sensory Authentication of European Extra-Virgin Olive Oi... more Page 1. J Sci Food Agric 1996,12,435-447 Sensory Authentication of European Extra-Virgin Olive Oil Varieties by Mathematical Procedures Ramon Aparicio,"* Juan J Calventeb and Maria T Morales" a Instituto de la Grasa, Avda ...
The Canadian Journal of Chemical Engineering, 2011
Densities and refractive indices of binary mixtures of isopropylethanoate with several symmetrica... more Densities and refractive indices of binary mixtures of isopropylethanoate with several symmetrical hydrocarbons viz cyclohexane, benzene, 1,4-dimethylbenzene and 1,3,5-trimethylbenzene at 308.15 K have been measured. The excess molar volumes (V E) are evaluated from the measured density values for the four binary systems. Experimental refractive indices are used to evaluate deviation in refractive indices (n) and molar refraction at experimental temperature. V E values are positive for the mixtures studied except binary mixtures between ester and 1,4-dimethylbenzene which have negative V E values. Standard deviations (V E) and (n) are also reported. Results are discussed in terms of molecular interactions between the components of the mixtures. Nous avons mesuré les densités et les indices de réfraction de mélanges binaires d'isopropyléthanoate avec plusieurs hydrocarbures symétriques, soit du cyclohexane, du benzène, du 1,4-diméthylbenzène et du 1,3,5-triméthylbenzèneà 308,15 K. Les volumes molaires excédentaires (V E) ont etéévaluésà partir des densités mesurées pour les quatre systèmes binaires. Les indices expérimentaux de réfraction ont serviàévaluer l'écart des indices de réfraction (n) ainsi que la réfraction molaireà la température expérimentale. Les valeurs des VEétaient positives pour les mélangeś etudiésà l'exception des mélanges binaires d'ester et de 1,4-diméthylbenzène qui présentaient des valeurs des VE négatives. Lesécarts type (V E) et (n) sontégalement indiqués. La discussion des résultats porte sur les interactions moléculaires entre les composants des mélanges.
Analytica Chimica Acta, 1995
A fuzzy filter has been defined to partially eliminate interference between membership grade func... more A fuzzy filter has been defined to partially eliminate interference between membership grade functions for the cases of absence and presence of uncertainty in input data. A functional study allowed us to analyse the effects on the qualified response of parameters involved in its definition, and hence choose the optimum values for them. Two applications concerning the authentication and sensory evaluation of olive oil are presented. Furthermore, the study reveals that its implementation in more general and sophisticated techniques is a straightforward matter, it being very appropriate for the pre-processing of fuzzy data.