Search results for "Performance."

The durability of basalt fibres reinforced polymer (BFRP) panels for cladding

2015

The study focuses on two basalt composite laminate panels for cladding, produced by means of vacuum bagging technique. In particular, unidirectional and random basalt fabrics, with different areal weights, using epoxy resin as matrix, were used. According to the ISO 15686 methodology for the evaluation of durability, samples were subjected to cycles of artificial aging in climatic chamber and outdoor exposure, carrying out mechanical (i.e. quasi-static and dynamic) and calorimetric tests. The results show the effectiveness over time of produced basalt composite laminates and the initial increase of the mechanical performances after the first steps of accelerated aging.

Effect of in-class group clicker-quiz competition on student final exam performance.

2019

The Lecture-Performance: Implementing Performative Pedagogy in Literature Class

2020

In recent years the performative has gained importance within the pedagogical field and has opened new perspectives in educational research. Experience has shown that the integration of performative elements in the learning process allow teachers to involve learners emotionally and cognitively. The present paper deals with a learning experience performed with students in the course “German Literature (2nd language)” at the University of Valencia. From the perspective of Performative Pedagogy, students are asked to carry out a research project and then transfer the acquired knowledge to the theatrical format that must be didactic: a Lecture-Performance. This activity highlights the benefits …

Importance sampling for Lambda-coalescents in the infinitely many sites model

2011

We present and discuss new importance sampling schemes for the approximate computation of the sample probability of observed genetic types in the infinitely many sites model from population genetics. More specifically, we extend the 'classical framework', where genealogies are assumed to be governed by Kingman's coalescent, to the more general class of Lambda-coalescents and develop further Hobolth et. al.'s (2008) idea of deriving importance sampling schemes based on 'compressed genetrees'. The resulting schemes extend earlier work by Griffiths and Tavar\'e (1994), Stephens and Donnelly (2000), Birkner and Blath (2008) and Hobolth et. al. (2008). We conclude with a performance comparison o…

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…