Search results for "longitudinal"

O2Transport in Skeletal Muscle: Development of Concepts and Current State

1994

When comparing oxygen consumption rates(V O2) of various organs — as shown in Fig. 1 —skeletal muscle is exceptional in two respects: Its consumption rate attains the second largest absolute value of all organs and may vary between rest (0.2 mlO 2.100g-1’• min -1 ) and maximum performance (16 m1O 2.100g-1 • min -1 for electrical stimulation) by a factor of 80, thus covering a range that is by far larger than in any other tissue. In order to understand muscle O 2 transport one has to identify transport mechanisms and evaluate their importance towards bringing about the observed high O 2 fluxes and allowing for their enormous variability.

Contextual and strategic knowledge in the acquisition of design expertise

2000

Abstract This study examines the acquisition of expertise in designing and developing information systems. The aim was to investigate how practical experience is related to contextual and strategic knowledge in problem-solving. Using a combination of expert–novice comparisons and longitudinal methods, professional systems analysts were compared with novices at the beginning and end of a seven month project-based course. The results show that during the course, the novices acquired a good deal of strategic competence in using domain-specific methods. Compared to the novices, the experts showed a more comprehensive and higher level of awareness of clients' contextual constraints. The study de…

Self Calibrating Nano-Ruler

2012

The aim of a nanoruler is to measure distances on a length scale in the order of nanometers. This concept can be realized by two plasmonic nanoparticles (usually spheres), which are placed within a short distance to each other. Since the plasmon modes of both particles are coupled, they influence each other along the interparticle axis (i.e. longitudinal plasmon mode, resulting in a shift of the resonance wavelength compared to the single particle. Because the resulting resonance wavelength depends on the interparticle distance, the spectral investigation of such a dimer allows the determination of the interparticle distance.

Teacher–child relationships and social competence: A two-year longitudinal study of Chinese preschoolers

2012

Abstract Based on a two-year and three-wave longitudinal sample of 118 Chinese preschoolers, the present study examined the cross-lagged associations between teacher–child relationships and social competence, and the cross-system generalization of social competence between home and school. At each of the three waves, teachers rated the children's teacher–child relationships and social competence in school, and mothers rated the children's social competence at home. The results showed that high closeness and low conflict in teacher–child relationships at three months after preschool entry (T1) predicted children's social competence in school at the end of the first preschool year (T2). T1 te…

How does job insecurity relate to self-reported job performance? Analysing curvilinear associations in a longitudinal sample

2013

The study focuses on the relationship between job insecurity and self-reported job performance. Based on theoretical, empirical, and statistical arguments, we propose that this relationship is U-shaped and mediated by vigour at work. This assumption was tested cross-sectionally and across two measurement points, and against two alternative explanations, namely that the U-shaped relationship might be due to the influence of the moderators optimism and supervisory support. The findings of a study among a large group of job-insecure employees of two Finish universities ( n = 2,095) confirm the U-shaped effect of job insecurity on self-reported job performance. This effect was shown to be robus…

Effects of work–family culture on employee well-being: Exploring moderator effects in a longitudinal sample

2010

This present panel study had three aims: (1) to shed new light on the work–family culture (WFC)–well-being (work–family conflict, work engagement, job exhaustion) linkage by investigating lagged associations between the phenomena; (2) to consider the multidimensional nature of WFC by specifying whether its lagged effects on well-being would vary by its dimensions; and (3) to explore whether the positive aspects of WFC would prevent its negative ones from spilling over into employee well-being. The study was based on a 2-year longitudinal sample (N = 409) gathered among Finnish health care workers. The results showed that WFC was a bidimensional construct containing both negative (work–famil…

Infants' hedonic responsiveness to food odours: a longitudinal study during and after weaning (8, 12 and 22 months)

2013

Abstract Background Olfaction is a highly salient sensory modality in early human life. Neonates show keen olfactory sensitivity and hedonic responsiveness. However, little is known about hedonic olfactory responsiveness between the neonatal period and 2 years of age. In an attempt to fill this gap, this longitudinal follow-up study aimed at investigating hedonic responses to food odours in infants during the first 2 years of life. The second objective was to evaluate whether gender has an influence on hedonic responses during this early period. Four control stimuli and eight odours (four rated by adults as a priori pleasant and four a priori unpleasant) were presented in bottles to 235 inf…

Adolescent Depressive Symptoms and Breakup Distress During Early Emerging Adulthood

2017

Breakups are a normative and frequent part of the romantic experience. In this longitudinal study, we followed 144 adolescents (mean age = 16.57) for a period of 4 years and examined the extent to which level of depressive symptoms predicts the intensity of breakup distress during emerging adulthood and, further, the extent to which breakup distress reported during emerging adulthood is associated with the quality of a current romantic relationship. The findings suggest that higher levels of depressive symptoms during adolescence can lead to more difficulty in recovering from breakup in early emerging adulthood. In addition, experiencing greater breakup distress during emerging adulthood w…

Frame Competition After Key Events: A Longitudinal Study of Media Framing of Economic Policy After the Lehman Brothers Bankruptcy 2008–2009

2016

Developmental trajectories of emotional disengagement from schoolwork and their longitudinal associations in England

2016

This study identified the varied ways in which emotional disengagement from schoolwork typically developed between 14 and 16 years of age, in the Longitudinal Study of Young People in England. Using growth mixture modelling we found eight main trajectories of (dis)engagement, with four trajectories of either increasing or stable emotional disengagement with schoolwork (41% of the sample). Using propensity score matching to create groups balanced on a wide range of covariates at Wave 1, we compared disengaged students to their engaged counterparts to identify the longitudinal effects of disengagement-trajectory membership on behavioural engagement, psychological wellbeing, substance use, car…