Search results for "Comet"
showing 10 items of 274 documents
Psychometric properties of the interaction on supervised classes scale (ISCS)
2016
Objeto: La presente investigación se centra en la construcción y validación de una escala diseñada para evaluar la calidad de la clases dirigidas: Escala de Interacción en las Clases Dirigidas (EICD). Diseño/metodología/enfoque: Se trata de un estudio descriptivo correlacional. Para la elaboración de la escala se recurrió a tres fases diferenciadas en las que diferentes expertos evaluaron la adecuación de los ítems, finalmente se estudiaron las propiedades psicométricas de la versión final en una muestra de 314 socios (69.1% mujeres) con edades entre los 18 y los 77 con una media de 39.33 años (DT=12.25). Aportaciones y resultados: La escala presenta una validez y fiabilidad adecuadas, sien…
Measurement invariance of the Prosocial Behavior Scale in three hispanic countries (Argentina, Spain, and Peru)
2020
Fil: Martí-Vilar, Manuel. Universitat de Valéncia. Facultat de Psicología. Departament de Psicología Básica; España Fil: Merino-Soto, César. Universidad de San Martín de Porres. Instituto de Investigación de Psicología; Perú Fil: Rodríguez, Lucas Marcelo. Pontificia Universidad Católica Argentina. Facultad Teresa de Ávila. Centro de Investigación Interdisciplinar en Valores, Integración y Desarrollo Social; Argentina Abstract: In a growing context of multiculturalism, prosocial behavior is important to build effective social exchange and service orientation among university students. The present study investigates prosocial behavior from a psychometric approach, to obtain evidence of the in…
The Role of parental control and Coping Strategies on adolescents’ problem behaviors
2020
The current study was aimed at contributing to the understanding of the role of perceived parental monitoring, psychological control, and coping strategies on adolescents’ problem behaviors, in terms of anxiety and drinking behavior. Participants were 541 high school students, 17 to 19-year old (M = 17.09, SD = 0.80) high school students in Sicily and Calabria (Italy). Participants completed self-report measures assessing parental monitoring, psychological control, coping strategies (i.e., Task-Oriented, Emotion-Oriented, and Avoidance-Oriented). Results of the path analysis showed that coping strategies play a mediating role in the association between parental psychological control and bot…
Autonomy and Relatedness in Adolescence and Emerging Adulthood: Relationships with Parental Support and Psychological Distress
2014
Autonomy and relatedness are fundamental needs both in adolescence and in emerging adulthood which are affected by parental support and are linked to children’s psychological distress. The study investigated autonomy and relatedness in late adolescents and emerging adults living in Italy, analyzing the relationships with perceived parental support and psychological distress. Self-report data were collected from a sample of 325 Caucasian adolescents and emerging adults (males = 41 %) ranging in age from 17 to 26 years and living in Sicily (southern Italy). Results showed that: (a) both autonomy and relatedness were positively predicted by parental support to these needs, (b) perceived suppor…
Adaptation and Psychometric Properties of the Scale of Positive and Negative Experience (SPANE) in the General Colombian Population
2021
(1) Background: Diener’s Scale of Positive and Negative Experiences (SPANE) assesses the presence and intensity of positive and negative affects, since these are considered basic aspects of the study of well-being. This article studies its psychometric properties in the general Colombian population. (2) We conducted a cross-sectional study of a sample of 1255 Colombians and we used structural equation modeling to confirm the bifactor structure. Additionally, we studied invariance by gender, and convergent and concurrent validity. (3) We found acceptable fit indicators for the bifactor model (CFI = 0.889, RMSEA = 0.046, SRMR = 0.059) as well as for the convergent (CFI = 0.909, RMSEA = 0.050,…
Photochemical and Photobiological Studies of a Furonaphthopyranone as a Benzo-spaced Psoralen Analog in Cell-free and Cellular DNA
1997
Photobiological activities of the benzo-spaced psoralen analog furonaphthopyranone 3 have been investigated in cell-free and cellular DNA. The molecular geometry parameters of 3 suggest that it should not form interstrand crosslinks with DNA. With cell-free DNA no evidence for crosslinking but also not for monoadduct formation was obtained; rather, the unnatural furocoumarin 3 induces oxidative DNA modifications under near-UVA irradiation. The enzymatic assay of the photosensitized damage in cell-free PM2 DNA revealed the significant formation of lesions sensitive to formamidopyrimidine DNA glycosylase (Fpg protein). In the photooxidation of calf thymus DNA by the furonaphthopyranone 3, 0.2…
Chemical abundances determined from meteor spectra II. Evidence for enlarged sodium abundances in meteoroids
2004
9 pages, 5 figures.-- Printed version published Mar 2004.
A comparison between the X-ray variable Sun and solar-like main sequence stars
2003
We analyze the time variations of the solar X-ray luminosity observed with Yohkoh/SXT with the aim to compare the X-ray variability of the Sun with that of the other solar-like main sequence stars as function of the relevant time scales. Since the observational set-up and strategies used to observe the Sun dier from those used for the other stars, we have explored the solar X-ray variability properties starting from the available solar data, trying to reproduce the observational procedures adopted for the stars. We have quantified how the solar variability amplitude increases with the explored time scales and found that solar-cycle variability can contribute at most up to 60% to the spread …
First Direct Observation of the Interaction between a Comet and a Coronal Mass Ejection Leading to a Complete Plasma Tail Disconnection
2007
This a discovery report of the first direct imaging of the interaction a comet with a coronal mass ejection (CME) in the inner heliosphere with high temporal and spatial resolution. The observations were obtained by the Sun-Earth Connection Coronal and Heliospheric Investigation (SECCHI) Heliospheric Imager-1 (HI-1) aboard the STEREO mission. They reveal the extent of the plasma tail of comet 2P/Encke to unprecedented lengths and allow us to examine the mechanism behind a spectacular tail disconnection event. Our preliminary analysis suggests that the disconnection is driven by magnetic reconnection between the magnetic field entrained in the CME and the interplanetary field draped around t…
On the factors governing the pressure dependence of the viscosity of moderately concentrated polymer solutions
1982
Viscosity measurements were carried out as a function of pressure and temperature with solutions of polystyrene in eight (endothermal) θ-solvents at the respective critical composition by means of a Searle-type apparatus. A rolling-ball viscometer was used for the investigation of the pure solvents. In all cases the viscosity coefficient increases in a more or less exponential manner when the pressure is raised. For θ-conditions, the volumes of activation of the solutions exceed that of the pure solvent by typically 10–15%. The exact amount of this extra efffect stemming from the presence of the polymer and its variation with temperature can be qualitatively correlated with the heats of mix…