Search results for "ciência"
showing 10 items of 241 documents
Quantification of synmagmatic flow structures: a tool for Rock Quality Evaluation
2013
The result of the analysis using methods based on fractal geometry provides information about magmatic flux directions and mineral equilibrium processes in the crystallizing magma chamber. Additionally, the used methods may also provide important information for the rock industry, because they allow a fast and automatically evaluation of rock quality.
Socially desirable responding:enhancement and denial in 20 countries
2015
This article investigated the dimensionality, measurement invariance, and cross-cultural variations of social desirability. A total of 3,471 university students from 20 countries completed an adapted version of the Marlowe–Crowne scale. A two-dimensional structure was revealed in the pooled sample, distinguishing enhancement (endorsement of positive self-description) and denial (rejection of negative self-description). The factor structure was supported in most countries; medium-sized item bias was found in two denial items. In a multilevel analysis, we found that (a) there was more cross-cultural variation in denial than enhancement; (b) females tended to score higher on enhancement where…
Gravitational-wave parameter inference using Deep Learning
2021
We explore machine learning methods to detect gravitational waves (GW) from binary black hole (BBH) mergers using deep learning (DL) algorithms. The DL networks are trained with gravitational waveforms obtained from BBH mergers with component masses randomly sampled in the range from 5 to 100 solar masses and luminosity distances from 100 Mpc to, at least, 2000 Mpc. The GW signal waveforms are injected in public data from the O2 run of the Advanced LIGO and Advanced Virgo detectors, in time windows that do not coincide with those of known detected signals, and the data from each detector in the Advanced LIGO and Advanced Virgo network is combined into a unique RGB image. We show that a clas…
The scale of personal conceptions of intelligence: A comparison of the Italian, Portuguese, and Romanian versions
2012
Background: The aim of this research project was to conduct studies of confirmatory factor analyses of ECPI (Scale of Personal Conceptions of Intelligence) in three different cultural contexts - Italy, Portugal and Romania. We hypothesized a bi-factor structure of the instrument constructed in Portugal by Faria (1990; 2006). Method: 617 subjects, 222 Italian, 200 Portuguese, and 195 Romanian students participated in the study, attending high school, equally distributed according to their gender and socioeconomic status. We administered the ECPI composed of 26 items, of which 15 static and 11 dynamic. Results: In the three cultural contexts the results revealed the existence of 7 items, one …
Three 2,5-dialkoxy-1,4-diethynylbenzene derivatives
2008
2,5-Diethoxy-1,4-bis[(trimethylsilyl)ethynyl]benzene, C20H30O2Si2, (I), constitutes one of the first structurally characterized examples of a family of compounds, viz. the 2,5-dialkoxy-1,4-bis[(trimethylsilyl)ethynyl]benzene derivatives, used in the preparation of oligo(phenyleneethynylene)s via Pd/Cu-catalysed cross-coupling. 2,5-Diethoxy-1,4-diethynylbenzene, C14H14O2, (II), results from protodesilylation of (I). 1,4-Diethynyl-2,5-bis(heptyloxy)benzene, C24H34O2, (III), is a long alkyloxy chain analogue of (II). The molecules of compounds (I)–(III) are located on sites with crystallographic inversion symmetry. The large substituents either in the alkynyl group or in the benz…
Measuring Collectivism and Individualism in the Third Millenium
2011
The aim in this study was to validate the Auckland Individualism-Collectivism Scale (AICS) across populations from 5 different countries and identify better ways to interpret the scores. Data were collected from New Zealand, Portugal, China, Italy, and Romania. The results indicate that the AICS is not only valid but also highly reliable (α > .70). Cluster analysis identified 4 clusters: low collectivism – high individualism; high collectivism – midlevel individualism; high collectivism – high individualism; and low collectivism – low individualism. Each group included individuals from all 4 clusters. The advantages of the AICS, the use of cluster analysis in cross-cultural measures, and…
Personal conceptions of intelligence: Cross-cultural comparisons between Portuguese and Italian students
2006
This article presents some results of an intercultural study on personal conceptions of intelligence. The sample includes 1,540 students, 811 Italians and 729 Portuguese, from both sexes and of different socioeconomic statuses, of secondary Grades 10 and 12 and of the 1st grade of several university courses in both countries. The instrument used was The Personal Conceptions of Intelligence Scale (Faria, 2003), with 26 items, translated and adapted to Portuguese and Italian. The level of education and the cultural context appear as the only variables with either principal and interaction effects on the differentiation of personal conceptions of intelligence, which are analyzed according to t…
Tears evoke the intention to offer social support: A systematic investigation of the interpersonal effects of emotional crying across 41 countries
2021
Tearful crying is a ubiquitous and likely uniquely human phenomenon. Scholars have argued that emotional tears serve an attachment function: Tears are thought to act as a social glue by evoking social support intentions. Initial experimental studies supported this proposition across several methodologies, but these were conducted almost exclusively on participants from North America and Europe, resulting in limited generalizability. This project examined the tears-social support intentions effect and possible mediating and moderating variables in a fully pre-registered study across 7007 participants (24,886 ratings) and 41 countries spanning all populated continents. Participants were prese…
Sobre cómo el conocimiento científico intenta aproximarse a la realidad
2012
A partir de la creencia errónea de que el conocimiento científico ofrece un cuadro detallado del mundo en que vivimos y muestra los caminos para adentrarnos en él, en este trabajo se analizan las estructuras y los procesos de la ciência para permitir vislumbrar cómo se produce el acercamiento de la ciência a la realidad. En concreto, se examinan teorías, conceptos, modelos y explicaciones científicas desde bases epistemologicas que se fundamentan en la história de la ciência. Se concluye que las construcciones teoricas de los científicos, que siempre son provisionales, les permiten aproximarse al mundo real y avanzar en sus programas de investigación, pero son independientes de la realidad …
La investigación cualitativa en las revistas españolas de ciencias del deporte (2007-2011)
2015
El objetivo de este estudio fue determinar el estado de la investigación cualitativa en las ciencias de la actividad física y del deporte en España, a partir del análisis de 1057 artículos publicados entre 2007 y 2011 en revistas españolas del campo indexadas en Scopus. Los resultados indican que sólo el 3.5% de los trabajos recurre a la metodología cualitativa y que en su mayor parte utilizan la entrevista como técnica de recogida de datos. Se señala como conclusión que la investigación cualitativa en las ciencias de la actividad física y el deporte en España se encuentra todavía en estado embrionario. The aim of this study was to determine the status of qualitative research in sport scien…