124 research outputs found
Quantum resistance metrology in graphene
We have performed a metrological characterization of the quantum Hall
resistance in a 1 m wide graphene Hall-bar. The longitudinal resistivity
in the center of the quantum Hall plateaus vanishes within the
measurement noise of 20 m upto 2 A. Our results show that the
quantization of these plateaus is within the experimental uncertainty (15 ppm
for 1.5A current) equal to that in conventional semiconductors. The
principal limitation of the present experiments are the relatively high contact
resistances in the quantum Hall regime, leading to a significantly increased
noise across the voltage contacts and a heating of the sample when a high
current is applied
AC power measurements of electric drives: a method incorporating calorimetry and DC measurements only
Realization of a Quantum Standard for AC Voltage: Overview of a European Research Project
Differential Sensitivity and Mechanism of Inhibition of COX-2 Oxygenation of Arachidonic Acid and 2-Arachidonoylglycerol by Ibuprofen and Mefenamic Acid†
Lying Behavior, Family Functioning and Adjustment in Early Adolescence
Item does not contain fulltextCommunication between children and parents has been the subject of several studies, examining the effects of, for example, disclosure and secrecy on adolescents' social relationships and adjustment. Less attention has paid to adolescent deception. We developed and tested a new instrument on lying behavior in a sample of 671 parent-adolescent couples. Analyses on the psychometric properties showed that this instrument had one principal component, and high internal consistency, item-total correlations and inter-item correlations. Lying was moderately associated with other indicators of parent-child communication, the quality of the parent-child relationship, and with parenting practices. In addition, frequent lying was moderately related to behavioral problems and emotional problems.10 p
Keeping secrets from parents: Longitudinal associations of secrecy in adolescence
Contains fulltext :
55705.pdf (publisher's version ) (Closed access)A 2-wave survey study among 1173 10-14-year-olds tested the longitudinal contribution of secrecy from parents to psychosocial and behavioral problems in adolescence. Additionally, it investigated a hypothesized contribution of secrecy from parents to adolescent development by examining its relation with self-control. Results showed that keeping secrets from parents is associated with substantial psychosocial and behavioral disadvantages in adolescence even after controlling for possible confounding variables, including communication with parents, trust in parents, and perceived parental supportiveness. Contrary to prediction, secrecy was also negatively associated with feelings of self-control. Secrecy from parents thus appears to be an important risk factor for adolescent psychosocial well-being and behavioral adjustment.12 p
Protagonistas na sociedade civil: redes e centralidades de organizações civis em São Paulo
Health related quality of life and parental perceptions of child vulnerability among parents of a child with juvenile idiopathic arthritis: results from a web-based survey
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