Search results for "Bull"

Fracture toughness of different monolithic zirconia upon post-sintering processes

2021

Background Surface treatments are expected to be a reason for alteration in fracture resistance of zirconia. This study evaluated the effect of post-sintering processes on the fracture toughness of different types of monolithic zirconia. Material and Methods Classical- (Cz) and high-translucent (Hz) monolithic zirconia discs (1.2 mm thickness, 14 mm in Ø) were prepared, and randomly divided for surface treatments with 1) as-glazed (AG); 2) finished and polished (FP); 3) finished, polished, and overglazed (FPOG); and 4) finished, polished, and heat-treated (FPHT) technique (n=15/group). Fracture toughness (KIC) was determined with indentation fracture toughness method at load 1 kg for AG, FP…

Influence of different veneering techniques and thermal tempering on flexural strength of ceramic veneered yttria partially stabilized tetragonal zir…

2019

Background Different technique for ceramic veneering and thermal tempering process are expected to be a reason for alteration in strength of ceramic veneered zirconia. This study evaluates the effect of different veneering technique and varied thermal tempering process on flexural strength of ceramic veneered zirconia. Material and Methods Ceramic veneered zirconia bars (25 mm length, 4 mm width, 0.7&1.0mm of zirconia & ceramic thickness) were prepared from zirconia block (e.max® ZirCAD), sintered at 1500°C for 4 hours, and veneered with ceramics with different techniques including CAD-fused using e.max CAD® (C), Pressed-on using e.max® Zirpress (P), and layering using e.max® ceram (L), wit…

Parental communication and feelings of affiliation in adolescent aggressors and victims of cyberbullying

2018

Cyberbullying is an increasingly frequent problem among adolescents, and it produces considerable social concern. Using a cross-sectional and quantitative methodology, the main objective of this study was to analyze the differences among students involved in the perpetration and victimization of cyberbullying (non-involved, occasional, and severe), in their parental communication, and feelings of affiliation with classmates. The sample consisted of 849 adolescents (51.7% boys and 48.3% girls) from 12 to 18 years old (M = 14.5

Ajuste psicosocial en adolescentes víctimas de cyberbullying

2017

1. INTRODUCCIÓN Los enormes y continuos avances de las nuevas tecnologías de la información y comunicación (TICs) han contribuido al desarrollo de nuevas formas de comunicación e interrelación social en la sociedad actual (Buelga y Chóliz, 2013). Pese a estas ventajas, han surgido nuevos problemas en la red como consecuencia del mal uso que algunos niños y adolescentes hacen de la TICs (Durán y Martínez, 2015; Ortega-Barón, Buelga y Cava, 2016; Rice et al., 2015). En este sentido, destaca el cyberbullying (CB), que ha sido definido como una “una conducta agresiva e in¬tencional que se repite de forma frecuente en el tiempo mediante el uso, por un indi¬viduo o grupo, de dispositivos electrón…

No more bullying in medical research

2022

Psychometric properties, validity and insights of the School Bullying Questionnaire (CIE-A) in secondary schools of the Valencian Community (Spain)

2021

Besides its several threats to health, welfare, social and academic development and performance of kids and teenagers, school bullying remains highlighted as one of the most relevant related challenges for educational, behavioral and legal sciences worldwide. Moreover, the lack of research on the field and the crucial but unattended need to count on psychometrically suitable and valid tools to detect school bullying make difficult understanding its contexts, dynamics and possible solutions. Objective The aim of this study was to thoroughly present in detail the psychometric properties and validity issues of the School Bullying Questionnaire (CIE-A) among secondary students. Methods A region…

School Bullying Through Graphic Vignettes : Developing a New Arts-Based Method to Study a Sensitive Topic

2020

The purpose of this study was to develop a new arts-based measure assessing school bullying and to test it within a pilot study involving 19 schoolchildren (mean age = 15.4; range = 1.00). The researchers designed the new methodological tool (referred to as graphic vignettes) as a set of incomplete comic strips, which participants were asked to complete in a creative way. Researchers then invited participants to engage in follow-up interviews using completed comic strips as individualized interview prompts. The authors detail the design and administration of the graphic vignettes and discuss their efficacy, limitations, and potential applications. The researchers argue that studies on sensi…

Unbiased Simultaneous Prediction Limits on Observations in Future Samples

2013

This paper provides procedures for constructing unbiased simultaneous prediction limits on the observations or functions of observations of all of k future samples using the results of a previous sample from the same underlying distribution belonging to invariant family. The results have direct application in reliability theory, where the time until the first failure in a group of several items in service provides a measure of assurance regarding the operation of the items. The simultaneous prediction limits are required as specifications on future life for components, as warranty limits for the future performance of a specified number of systems with standby units, and in various other app…

Propuestas teóricas en la investigación sobre acoso escolar: una revisión

2013

Four decades of research into peer bullying have produced an extensive body of knowledge. This work attempts to provide an integrative theoretical framework, which includes the specific theories and observations. The main aim is to organize the available knowledge in order to guide the development of effective interventions. To that end, several psychological theories are described that have been used and/or adapted with the aim of understanding peer bullying. All of them, at different ecological levels and different stages of the process, may describe it in terms of the relational dynamics of power. It is concluded that research needs to take this integrative framework into account, that i…

Avoiding Demand Amplification Phenomenon via Hi-tech Application: A What-If Supply Chain Analysis

2010

The well-known deleterious effect of the amplification of variance of order rates in multi-echelon systems, commonly known as demand amplification phenomenon or bullwhip effect, still presents new challenges and continues to fascinate the operations management community. Recently this research field is focusing on the study of robustness of bullwhip avoidance techniques under uncertainty, as environmental conditions often determine variations in processes, with regards to production and delivery lead time, and variations in the parameters of the decision policies. This work aims at quantifying the efficacy of bullwhip dampening techniques and at verifying this efficacy against variations in…