Search results for "equation"
showing 10 items of 4219 documents
The finite element method for the mechanically-based model of non-local continuum
2011
In this paper the finite element method (FEM) for the mechanically based non-local elastic continuum model is proposed. In such a model each volume element of the domain is considered mutually interacting with the others, beside classical interactions involved by the Cauchy stress field, by means of central body forces that are monotonically decreasing with their inter-distance and proportional to the product of the interacting volume elements. The constitutive relations of the long-range interactions involve the product of the relative displacement of the centroids of volume elements by a proper, distance-decaying function, which accounts for the decrement of the long-range interactions as…
Longitudinal study predicting burnout in Spanish nurses: The role of neuroticism and emotional coping
2019
Abstract The aim of the present study was to investigate whether nursing students' neuroticism trait and coping styles can predict nurses' professional burnout. A three-wave longitudinal study with a time lag of 6 years was conducted, following nursing students from three Spanish universities until they joined the health labor market. The sample consisted in 249 students in the first year of their nursing studies (T1), 199 at the end of their studies (T2), and 70 registered nurses three years after graduation (T3). Predictor variables were neuroticism, emotional and behavioural coping. Criterion variables were the three components of burnout (emotional exhaustion, despersonalization, and pe…
The Role of Family Background, School Success, and Career Orientation in the Development of Sense of Coherence
2005
Abstract. This study investigates family background (child-centered parenting, parental socioeconomic status), school success in adolescence, and career orientation (education, stability of career line) in adulthood as antecedents of adult sense of coherence (SOC; Antonovsky, 1987a ), which has been posited to be a disposition crucial to understanding individual differences in successful coping with stress. Participants (104 men and 98 women) were drawn from the ongoing Jyväskylä Longitudinal Study of Personality and Social Development (JYLS), which was started when the participants were 8- or 9-year-old children (in 1968). Data gathered at ages 14, 27, 36, and 42 were used in this study. …
Relationships Between Social Support, Loneliness, and Internet Addiction in Chinese Postsecondary Students: A Longitudinal Cross-Lagged Analysis
2018
Using the Internet has become one of the most popular leisure activities among postsecondary students in China. Concern about the large number of students using the Internet has led to an increase in research on the influencing factors of Internet addiction and the negative consequences caused by it. This short-term longitudinal study examined the associations among three dimensions of social support [objective support (OS), subjective support (SS), and support utilization (SU)], loneliness, and the four dimensions of Internet addiction (compulsive Internet use [CIU] & withdrawal from Internet addiction [WIA], tolerance of Internet addiction [TIA], time-management problems [TMPs], and i…
Longitudinal study on reciprocity between personality traits and parenting stress
2014
Reciprocal associations between the Big Five personality traits and parenting stress—including both parents’ feelings of their distress and perception of their incompetence as parents—were studied with 248 participants (49% of which were males). Longitudinal data, collected at ages 33/36, 42 and 50 years, were used. Cross-lagged path analysis revealed that in case of both mothers and fathers, neuroticism at age 33 predicted high parenting stress, and extraversion at age 33 predicted low parenting stress at age 42. Also, parenting stress at age 36 predicted high neuroticism and low extraversion at age 42. From age 42 to 50, only high parenting stress contributed to low neuroticism. Thus, mo…
Self-esteem: An antecedent or a consequence of social support and psychosomatic symptoms? Cross-lagged associations in adulthood
2008
Abstract This study investigated the relationships of self-esteem with social support and psychosomatic symptoms in cross-lagged longitudinal data with two measurement points and a time lag of 6 years. Two hundred thirteen participants were drawn from the ongoing Jyvaskyla Longitudinal Study of Personality and Social Development, Finland. The present study focused on data collected by questionnaires at ages 36 and 42. The cross-lagged analyses of Structural Equation Modeling (SEM) indicated that high self-esteem at age 36 predicted high social support 6 years later and simultaneously, but to a lesser extent, high social support at age 36 predicted high self-esteem at age 42. In addition, lo…
Factor Structure and Longitudinal Factorial Validity of the Core Self-Evaluation Scale
2018
Abstract. The personality high-order concept of core self-evaluations (CSE), which refers to a basic evaluation of one’s worth, capability, and effectiveness, has attracted a lot of research interest. Yet little is known about the construct validity of the core self-evaluation scale (CSES) while information on its longitudinal factorial validity is wholly lacking. This study investigated the factor structure of the CSES using both confirmatory and exploratory factor analysis implemented in Mplus program. In addition, the factor loading invariance over time was investigated using exploratory structural equation modeling. Longitudinal data with three follow-ups over 2 years, gathered among u…
Teachers' Behavior and Pupils' Achievement Motivation as Determinants of Intended Helping Behavior in Physical Education
2013
The present two-wave longitudinal study examined the extent to which physical education (PE) teachers' democratic and socially supportive behavior, pupils' goal orientations, and the perceived motivational climate in PE explained differences in pupils' intended helping behavior by gender in PE classes. The results of 105 boys and 109 girls based on structural equation modeling revealed at both time points that the PE teachers' democratic and socially supportive behavior was positively related to pupils' concurrent perceptions of the motivational climate as task-involving as well as their higher concurrent intended helping behavior in PE. Pupils' prior perceptions of the motivational climate…
Toward an understanding of a healthy organizational change process : A three-wave longitudinal study among university employees
2019
This study aimed to improve our understanding of what constitutes a healthy organizational change process among university employees. Positive attitudes and proactive participation toward organizational change were presumed to affect and be affected by personality resources measured via core self-evaluations and work-related motivational well-being (vigor). The study used 3-wave longitudinal data collected in 2 large Finnish universities during their recent process of organizational change (N = 926). Structural equation modeling was used to establish the direction of the relationships between the variables. The results showed that high levels of both core self-evaluations and vigor were ass…
A second-order differential equation for the two-loop sunrise graph with arbitrary masses
2011
We derive a second-order differential equation for the two-loop sunrise graph in two dimensions with arbitrary masses. The differential equation is obtained by viewing the Feynman integral as a period of a variation of a mixed Hodge structure, where the variation is with respect to the external momentum squared. The fibre is the complement of an elliptic curve. From the fact that the first cohomology group of this elliptic curve is two-dimensional we obtain a second-order differential equation. This is an improvement compared to the usual way of deriving differential equations: Integration-by-parts identities lead only to a coupled system of four first-order differential equations.