Search results for "Experimental"
showing 10 items of 18236 documents
How do gender, Internet activity and learning beliefs predict sixth-grade students’ self-efficacy beliefs in and attitudes towards online inquiry?
2021
Today’s students search, evaluate and actively use Web information in their school assignments, that is, they conduct an online inquiry. This current survey study addresses sixth-grade students’ self-efficacy beliefs in and attitudes towards online inquiry, and to what extent free-time and school-related Internet activity, gender and learning beliefs explain these. The questionnaire was administered in 10 schools to 340 sixth-graders in Finland. Exploratory and confirmatory factor analyses revealed three elements of self-efficacy beliefs: self-efficacy in Web searching, the evaluation of sources and synthesising information. Furthermore, attitudes towards online inquiry loaded into two fact…
Investigating teachers’ dyadic self-efficacy and its correlations to students’ perceptions of teacher efficacy and student well-being
2022
Most studies, to date, have ignored variance in teachers’ self-efficacy (TSE) in relation to teaching individual students (i.e., student-specific self-efficacy). However, TSE and teacher efficacy differ among students. Thus, this study examines dyadic TSE in four domains and their correlations with students’ perceptions of teacher efficacy and student academic self-concept and well-being. Results of a paper–pencil survey involving 29 teachers and 469 students (39.9% girls, aged 10–17 years) from German secondary schools reveal a moderate overlap between dyadic TSE and students’ perceptions of teacher efficacy. Furthermore, they reveal variance in how teachers’ and students’ ratings are rela…
Effects of Transcranial Direct Current Stimulation on Baseline and Slope of Prefrontal Cortex Hemodynamics During a Spatial Working Memory Task
2020
Background: Transcranial direct current stimulation (tDCS) has been shown to be an inexpensive, safe, and effective way of augmenting a variety of cognitive abilities. Relatively recent advances in neuroimaging technology have provided the ability to measure brain activity concurrently during active brain stimulation rather than after stimulation. The effects on brain activity elicited by tDCS during active tDCS reported by initial studies have been somewhat conflicted and seemingly dependent on whether a behavioral improvement was observed. Objective: The current study set out to address questions regarding behavioral change, within and between-participant designs as well as differentiatin…
CNO and pep solar neutrino measurements and perspectives in Borexino
2015
International audience; The detection of neutrinos emitted in the CNO reactions in the Sun is one of the ambitious goals of Borexino Phase-II. A measurement of CNO neutrinos would be a milestone in astrophysics, and would allow to solve serious issues in current solar models. A precise measurement of the rate of neutrinos from the pep reaction would allow to investigate neutrino oscillations in the MSW transition region. The pep and CNO solar neutrino physics, the measurement in Borexino Phase-I and the perspectives for the new phase are reviewed in this proceeding.
Measurement of Solar pp-neutrino flux with Borexino: results and implications
2015
International audience; Measurement of the Solar pp-neutrino flux completed the measurement of Solar neutrino fluxes from the pp-chain of reactions in Borexino experiment. The result is in agreement with the prediction of the Standard Solar Model and the MSW/LMA oscillation scenario. A comparison of the total neutrino flux from the Sun with Solar luminosity in photons provides a test of the stability of the Sun on the 10(5) years time scale, and sets a strong limit on the power production by the unknown energy sources in the Sun.
Improved measurement of $^8$B solar neutrinos with $1.5 kt·y$ of Borexino exposure
2017
We report on an improved measurement of the $^8$B solar neutrino interaction rate with the Borexino experiment at the Laboratori Nazionali del Gran Sasso. Neutrinos are detected via their elastic scattering on electrons in a large volume of liquid scintillator. The measured rate of scattered electrons above 3 MeV of energy is $0.223\substack{+0.015 \\ -0.016}\,(stat)\,\substack{+0.006 \\ -0.006}\,(syst)$ cpd/100 t, which corresponds to an observed solar neutrino flux assuming no neutrino flavor conversion of $\Phi\substack{\rm ES \\ ^8\rm B}=2.57\substack{+0.17 \\ -0.18}(stat)\substack{+0.07\\ -0.07}(syst)\times$10$^6$ cm$^{-2}\,$s$^{-1}$. This measurement exploits the active volume of the …
Desarrollo de nuevas estrategias en cromatografía líquida para el análisis de muestras complejas
2023
Desde los años 70, el uso de la cromatografía líquida de alta resolución (HPLC, High Performance Liquid chromatography) ha ido creciendo en los laboratorios analíticos, siendo actualmente la técnica de separación analítica más utilizada. Desafortunadamente, la eficacia suele ser menor que la que se logra en otras técnicas de separación como la cromatografía de gases y la electroforesis capilar. Esto restringe el análisis de muestras complejas. De ahí el gran esfuerzo dedicado a aumentar la eficacia y selectividad en HPLC, con importantes mejoras desde el inicio de la técnica. A pesar de los avances en las últimas décadas, con el desarrollo de instrumentación cada vez más sofisticada, y la m…
Motivación y aprendizaje escolar en la Educación Secundaria Obligatoria: Un estudio empírico desde el Modelo de Calidad de Situación Educativa
2015
La desmotivación de los alumnos/as es uno de los principales problemas con los que se enfrenta actualmente el profesorado, sobre todo en los niveles de educación secundaria. Basándonos en el Modelo de Calidad de Situación Educativa (MCSE) (Doménech, 2006, 2007, 2011a, 2011b, 2012, 2013 y Doménech-Betoret, Gómez-Artiga y Lloret-Segura, 2014), este estudio, compuesto de cuatro investigaciones independientes, examina a) cómo se genera la motivación de los alumnos/as de secundaria y cómo ésta va evolucionando a lo largo del curso en función de sus variables personales y de la percepción que éstos se formen del contexto de la situación educativa. Además, b) examina de forma simultánea el efecto …
Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory
2017
We report a multi-resolution search for anisotropies in the arrival directions of cosmic rays detected at the Pierre Auger Observatory with local zenith angles up to $80^\circ$ and energies in excess of 4 EeV ($4 \times 10^{18}$ eV). This search is conducted by measuring the angular power spectrum and performing a needlet wavelet analysis in two independent energy ranges. Both analyses are complementary since the angular power spectrum achieves a better performance in identifying large-scale patterns while the needlet wavelet analysis, considering the parameters used in this work, presents a higher efficiency in detecting smaller-scale anisotropies, potentially providing directional informa…
Estudio experimental comparado de marcadores bioquímicos en la infección por Fasciola hepatica y F. gigantica
2017
Fascioliasis is caused by the genetically and phenotypically very close Fasciola hepatica and F. gigantica. The latter, always considered secondary in human infection, appears nowadays increasingly involved in human endemic areas of Africa and Asia. Unfortunately, little is known about the pathogenicity of this liver fluke species, mainly due to difficulties assessing the moment of a patient's infection in the anamnesis and in the differential diagnosis with F. hepatica. This is the first experimental study comparing F. hepatica and F. gigantica in a long-term study of up to 24 weeks with genotypically and phenotypically standardised fluke strains in the same animal model host, the Guirra s…