Search results for "performance"
showing 10 items of 4457 documents
Impact of chaotic dynamics on the performance of metaheuristic optimization algorithms : An experimental analysis
2022
Random mechanisms including mutations are an internal part of evolutionary algorithms, which are based on the fundamental ideas of Darwin's theory of evolution as well as Mendel's theory of genetic heritage. In this paper, we debate whether pseudo-random processes are needed for evolutionary algorithms or whether deterministic chaos, which is not a random process, can be suitably used instead. Specifically, we compare the performance of 10 evolutionary algorithms driven by chaotic dynamics and pseudo-random number generators using chaotic processes as a comparative study. In this study, the logistic equation is employed for generating periodical sequences of different lengths, which are use…
The socio-ecological and personal determinants of school performance and motivation of high school students
2022
For decades, and with the work of Moos (1979) and Walberg (1969), educational research has consistently demonstrated the importance of the personal characteristics of students and the socio-ecological characteristics of the classroom in determining the affective and cognitive development of students.Unfortunately, no research on this subject has been done in France with high school students. This is why we set ourselves the objective of studying the environmental and personal determinants of high school students' academic performance and motivation. Using the L.E.I (Walberg, 1969) and EMMAS (Ntamakiliro et al., 2000) measurement scales, as well as data collection from 405 students enrolled …
L'environnement social de la classe et les performances scolaires des élèves : étude des effets de ses aspects personnel et consensuel
2013
Depuis plus de quatre décennies, des centaines de recherches internationales s'inscrivant dans "la psychologie des environnements sociaux de la classe" ne cessent de démontrer que l'environnement - ou le climat - social de cette dernière détermine les apprentissages scolaires de l'élève (Bennacer, 2007, 2011 ; Bennett, 2011 ; Wolf & Fraser, 2008 ; Zeidan, 2010). Elles ont souvent fait appel au fameux constat de MacLeod (1951), selon lequel l'environnement comporte autant un aspect personnel que consensuel. Malheureusement, la plupart des auteurs ne se sont intéressés qu'à l'un ou à l'autre aspect de l'environnement social de la classe dans l'explication des apprentissages des élèves. Le cli…
In vitro P-glycoprotein efflux inhibition by atypical antipsychotics is in vivo nicely reflected by pharmacodynamic but less by pharmacokinetic chang…
2011
Abstract Background P-glycoprotein (P-gp), an efflux transporter of the blood–brain barrier, limits the access of multiple xenobiotics to the central nervous system (CNS). Thus drug-dependent inhibition, induction or genetic variation of P-gp impacts drug therapy. Methods We investigated atypical antipsychotics and their interaction with P-gp. Amisulpride, clozapine, N-desmethylclozapine, olanzapine, and quetiapine were assessed in vitro on their inhibitory potential and in vivo on their disposition in mouse serum and brain, and behaviourally on the RotaRod test. In vivo wildtype (WT) and mdr1a/1b double knockout mice (mdr1a/1b (−/−, −/−); KO) were investigated. Results In rhodamine 123 eff…
Comparison of several methods used for the determination of cephalosporins. Analysis of cephalexin in pharmaceutical samples
2002
The precision of UV absorbance of intact and acid degraded cephalosporins, ninhydrin, high performance liquid chromatography and iodometric methods used for analysis of cefoxitin, cefotaxime, cephazolin and cephalexin were compared. To obtain the calibration graphs the analytical signal used were: absorbance, first derivative absorbance, second derivative absorbance and H-point Standard Additions Method by using absorbance values at two selected wavelengths as analytical signal. These methods and calibration graphs were also used for the determination of cephalexin in pharmaceutical samples.
Determination of pharmaceutical residues in wastewater using high performance liquid chromatography coupled to quadrupole-Orbitrap mass spectrometry
2016
Abstract A multi-class method for the determination of 24 emerging pharmaceutical residues has been developed and validated. The method is based on solid-phase extraction of wastewater samples using Strata-X cartridges followed by high performance liquid chromatography coupled to hybrid quadrupole − Orbitrap high resolution mass spectrometry (HPLC-Q-Orbitrap-HRMS). A single-laboratory validation procedure showed satisfactory analytical performance. The analysis of 21 samples collected at the wastewater treatment plant in Riga revealed the occurrence of 20 compounds of different therapeutic classes. The highest concentration was found for the central nervous system stimulator caffeine − up t…
Effects of a Complex Physical Activity Program on Children’s Arithmetic Problem Solving and Arithmetic Reasoning Abilities
2023
Research has shown that higher levels of physical activity are associated with better cognitive performance in children. However, the benefits of physical activity on academic achievement and specifically on mathematics performance need to be further explored. Therefore, this study aimed to investigate the effects of a complex physical activity (CPA) intervention program, including cognitive involvement, on children’s mathematics performance. The participants were 128 children (aged 12–13 years) attending third grade in three middle schools. They were randomly allocated into a CPA intervention (n = 64) or a waitlist control group (n = 64), the latter of which was given a regular…
L’adempimento in natura alla luce della riforma del code civil
2018
Il code civil riformato ha integralmente riscritto la disciplina dell’inexécution du contrat, tra le altre cose riconoscendo espressamente il rimedio dell’adempimento in natura, ossia l’exécution forcée en nature, e riservandogli una compiuta disciplina. Così è stato possibile superare l’angusta formulazione originaria del code civil in materia e recepire nel codice soluzioni che, nonostante le indicazioni di segno contrario offerte dalla sua precedente versione, si erano lentamente affermate tanto in dottrina quanto in giurisprudenza, anche per effetto degli influssi provenienti dagli altri sistemi giuridici continentali e dal diritto privato europeo. L’illustrazione del nuovo sistema fran…
Enhanced Spatial Navigation Skills in Sequence-Space Synesthetes
2018
Contains fulltext : 219554.pdf (Publisher’s version ) (Closed access) Individuals with sequence-space synesthesia (SSS) perceive sequences like months, days and numbers in certain spatial arrangements. Several cognitive benefits have been associated with SSS, such as enhanced mental rotation, more vivid visual imagery and an advantage in spatial processing. The current study aimed to further investigate these cognitive benefits, focusing on spatial navigation skills, to explore if their enhanced sensitivity to spatial relations is reflected in enhanced navigational performance. Synesthetes were distinguished from controls by means of a questionnaire, a consistency test and drawings. A virtu…
Right-handers and left-handers have different representations of their own hand
1998
The visual control of our own hand when dealing with an object and the observation of interactions between other people's hand and objects can be involved in the construction of internal representations of our own hand, as well as in hand recognition processes. Therefore, a different effect on handedness recognition is expected when subjects are presented with hands holding objects with either a congruent or an incongruent type of grip. Such an experiment was carried out on right-handed and left-handed subjects. We expected that the different degree of lateralisation in motor activities observed in the two populations [J. Herron, Neuropsychology of left- handedness, Academic Press, New York…