Search results for "Rating"

Periodic time-domain modulation for the electrically tunable control of optical pulse train envelope and repetition rate multiplication

2012

An electrically tunable system for the control of optical pulse sequences is proposed and demonstrated. It is based on the use of an electrooptic modulator for periodic phase modulation followed by a dispersive device to obtain the temporal Talbot effect. The proposed configuration allows for repetition rate multiplication with different multiplication factors and with the simultaneous control of the pulse train envelope by simply changing the electrical signal driving the modulator. Simulated and experimental results for an input optical pulse train of 10 GHz are shown for different multiplication factors and envelope shapes. © 2006 IEEE.

Photonic fractional Fourier transformer with a single dispersive device

2013

In this work we used the temporal analog of spatial Fresnel diffraction to design a temporal fractional Fourier transformer with a single dispersive device, in this way avoiding the use of quadratic phase modulators. We demonstrate that a single dispersive passive device inherently provides the fractional Fourier transform of an incident optical pulse. The relationships linking the fractional Fourier transform order and scaling factor with the dispersion parameters are derived. We first provide some numerical results in order to prove the validity of our proposal, using a fiber Bragg grating as the dispersive device. Next, we experimentally demonstrate the feasibility of this proposal by us…

New solvability conditions for the Neumann problem for ordinary singular differential equations

2000

Hydropower Potential in Water Distribution Networks: Pressure Control by PATs

2014

Pressure control is one of the main techniques to control leakages in Water Distribution Networks (WDNs) and to prevent pipe damage, improving the delivery standards of a water supply systems. Pressure reducing stations (PRSs) equipped by either pressure reducing valves or motor driven regulating valves are commonly used to dissipate excess hydraulic head in WDNs. An integrated new technical solution with economic and system flexibility benefits is presented which replaces PRSs with pumps used as turbines (PATs). Optimal PAT performance is obtained by a Variable Operating Strategy (VOS), recently developed for the design of small hydropower plants on the basis of valve time operation, and n…

Interpersonal Relationship Aspects as Perceived Risk and Social Support Factors in a Clinical Sample of Adolescents With Depression

2020

Abstract The goal of this qualitative study was to explore how adolescents with diagnosed depression describe their social relationships with peers, parents and teachers. Several previous findings have revealed the dual role of interpersonal relationships — as a stressor and contributor to different mental disorders, and also as a source of social support for mental health. Previous studies confirmed the value of a qualitative approach in exploring the self-perceived experiences of adolescents. The research group consisted of 28 adolescents, aged 13–17, with a diagnosis of depression. Individual semistructured interviews (Children's Depression Rating Scale Revised; CDRS-R) were applied in t…

Psychometric properties of the Situational Inventory of Body-Image Dysphoria-Short form in a Spanish sample

2006

The primary objective of this study was to translate and validate Situational Inventory of Body-Image Dysphoria-Short form (SIBID-S) in a Spanish population. The scale consists of 20 items to assess the frequency of dysphoric body-image emotions in certain situational contexts, using a five-point rating scale. The questionnaire was administered to 214 women between the ages of 14 and 29 years, from primary and secondary schools and a university. Principal components analysis indicated a one-factor structure for the entire sample and both younger (18) and older (or=18) participants. Internal consistency was high (0.94), and the test-retest reliability over 1 month ranged between 0.89 and 0.9…

The assessment of susceptibility to emotional contagion: A contribution to the Italian adaptation of the “Emotional Contagion Scale”

2013

The Emotional Contagion Scale (ECS; Doherty, 1997) is a self-report instrument assessing susceptibility to emotional contagion. The study was aimed at examining its dimensionality, reliability, and validity in the Italian context. It was completed by 541 young adults (45% men) in Study 1 and 649 young adults (40% men) in Study 2. The results of a series of confirmatory factor analyses showed that a bi-factor model, with one general factor and four specific factors was supported. The general and specific factors resulted differently related to self-other differentiation, empathy, emotional fragility, masculinity, and femininity. Notwithstanding, the results posited some questions about the E…

Assessment of students' situation-specific classroom engagement by an InSitu Instrument

2016

The present study aims to expand the current understanding of engagement by examining variations in students' situation-specific engagement in lower secondary school. In addition, the validity and reliability of a new situation-specific InSitu Instrument were examined. The sample consisted of 1809 Finnish students attending Grade 7. The students filled in mobile ratings on their lesson-specific engagement after lessons. Furthermore, they answered questionnaires concerning their overall engagement, achievement beliefs, and task values in math and literacy. The results showed substantial variation within and between students in situational engagement. A five-factor structure was identified fo…

A teacher-report measure of children's task-avoidant behavior: A validation study of the Behavioral Strategy Rating Scale

2011

Abstract This study aims to validate a teacher-report measure of children's task-avoidant behavior, namely the Behavioral Strategy Rating Scale (BSRS), in a sample of 352 Finnish children. In each of the four waves from Kindergarten to Grade 2, teachers rated children's task-avoidant behavior using the BSRS, children completed reading and mathematics tests, and trained testers rated children's task-avoidant and social-dependent behavior after the test situation. Mothers also rated children's task-avoidant behavior in the last two waves. The results showed that a two-factor model including one factor representing task avoidance and one method factor accounting for wording effects among the n…

A Validation Study of Classroom Assessment Scoring System–Secondary in the Finnish School Context

2017

This study examined the reliability and validity of the Classroom Assessment Scoring System–Secondary (CLASS-S) in Finnish classrooms. Trained observers coded classroom interactions based on video recordings of 46 Grade 6 classrooms (450 cycles). Concurrent associations were investigated with respect to teacher self-ratings (e.g., efficacy beliefs and teaching-related stress). Confirmatory factor analysis showed that the hypothesized three-factor structure of the original CLASS-S (Emotional Support, Organizational Support, and Instructional Support), with some modifications, provided a better fit for the data compared with one- and two-factor structures. Structural validity was demonstrate…