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Wyświetlanie 1-2 z 2
Tytuł:
COMPARING THE SHORT AND LONG-TERM EFFECTS OF ACUTE MODERATE-INTENSITY EXERCISE ON MNEMONIC SIMILARITY AND RMOTIONAL MEMORY TASKS
Autorzy:
Acevedo-Triana, Cesar
Cordoba-Patiño, Diana
Muñoz, Juan Francisco
Cifuentes, Julian
Melgarejo Pinto, Victor
Rodriguez W, Oscar
Hurtado-Parrado, Camilo
Powiązania:
https://bibliotekanauki.pl/articles/2137978.pdf
Data publikacji:
2021-01-28
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
exercise moderate-intensity
pattern separation
emotional memory
long term memory
young
Opis:
Mounting research has linked acute moderate-intensity exercise with changes indiscrimination of similar events – i.e., mnemonic memory. Conversely, few studies have compared performance in tasks associated to each type of memory(mnemonic similarity and emotional) and less have evaluated performance several days after exercise sessions. Thirty-five undergraduate students were randomly distributed in three groups that differed in the assigned duration of the moderate-intensity ex- ercise session. We established first the moderate-intensity exercise program by calculating the VO2max 50%. Two-to-five days later, participants engaged in the exercise condition to which they were assigned, followed by a five-minute rest period. Immediately after, all participants were ex posed to the training phase of both memory tasks. The first retrieval phase was tested 45 minutes after encoding phase was completed. Subsequent retrieval phases were conducted 24, 48, and 168 hours post-training. Exercise of long duration increased discrimination performance in images of low similarity. Comparison of the effects of exercise on discrimination of the three types of images that the emotional-memory task entails showed improved performance only for aversive and neutral images. Exercise improves discrimination of low similarity images, with better overall perform- ance after a longer exercise session. This finding adds to previous reports that have found analogous effects using other memory tasks. It also supports the notion that acute effects due to exercise are specifically related to hippocampal functionality and its ability to separate patterns. Finally, maintenance of emotional informa- tion across time suggest a different mechanism, independent of pattern- separation processing. ----------------------------------------------------------------------------------------------------------------------------
Źródło:
Acta Neuropsychologica; 2021, 19(1); 33-61
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sensitivity analysis of kinetic characterizations in continuous flotation circuits under moderate deviations with respect to perfect mixing
Autorzy:
Vinnett, Luis
Pino-Muñoz, Catalina A.
Yianatos, Juan
Díaz, Francisco
Henríquez, Felipe
Powiązania:
https://bibliotekanauki.pl/articles/2146941.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation kinetics
residence time distribution
perfect mixing
flotation rate distribution
industrial flotation circuit
Opis:
This paper studies the effect of moderate deviations with respect to perfect mixing on the estimated kinetic parameters in industrial flotation banks. Radioactive tracer tests and mass balance surveys were performed to characterize the mixing regimes and Cu kinetic responses. For three models (Single Rate Constant, Rectangular and Gamma), two approaches to incorporate the residence time distributions (RTD) in the kinetic characterizations of rougher banks were compared: (i) RTDs measured from the radioactive tracer tests; and (ii) pure perfect mixing in each flotation machine. The measured RTDs did not present significant bypass in the evaluated banks. In all cases, comparable model fitting was obtained with both RTD approaches, which indicates that the kinetic models add sufficient flexibility to compensate for moderate biases in the mixing regime. The studied kinetic models showed non-significant differences in the estimated maximum recoveries (R∞), mean (kmean) and median (k50) rate constants when comparing the process modelling from measured RTDs and pure perfect mixing. However, the Gamma model was more sensitive to the RTD assumption in terms of the shapes of the flotation rate distributions. From the results, kinetic characterizations focused only on model fitting, or on R∞ and kmean (or k50) estimations have low sensitivity to the assumption of perfect mixing when the RTDs present moderate deviations with respect to this regime. Special attention must be paid when characterizing floating components as the perfect mixing assumption may bias the shapes of the flotation rate distributions.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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