This article explores the pattern and breadth of collaboration activities of innovating firms active in renewable energy (RE), and the impact of collaboration on firm-level innovation performance. We deploy a unique dataset from a special section of the 2014 CIS survey in Denmark, in which we included questions that enable us to unambiguously identify RE innovators. In a quantitative analysis, ...

The paper presents the first known longitudinal study of the relationship between loneliness, depressive symptoms, and suicide ideation in adolescence, in a stratified sample of high school students (Time 1 N = 1009; 57 % female; Time 2 N = 541; 60 % female). Cross-lagged structural equation modeling indicated that depressive symptoms led to more loneliness across time, whereas loneliness did n...

BACKGROUND Adolescents' sleep duration and subjective psychological well-being are related. However, few studies have examined the relationship between sleep duration and subjective psychological well-being longitudinally across adolescence - a time of profound biological and psychosocial change. The aim of this longitudinal study was to investigate whether shorter sleep duration in adolescents...

conclusions alterations in consumption of whole grains, vegetables, and added sugars are associated with body weight change, suggesting that it could be helpful in weight control. results in men, weight loss was significantly predicted only by decreased intake of added sugars (or: 2.21, 95% ci: 1.06-4.63). in women, weight gain was significantly predicted by decreased intake of whole grains (or...

background menarche is considered as a milestone in the women’s reproductive life. most existing studies on factors influencing menarcheal age had cross-sectional designs and their finding were controversial. objectives we aimed to determine some factors affecting the age at menarche in a cohort study with an average of ten-year follow-up; the study was conducted within the framework of tehran ...

Background: The effectiveness of treatment for people with substance use disorders is usually examined using longitudinal cohorts. In these studies, treatment is often considered as a time-varying exposure. The aim of this commentary is to examine confounding in this context, when the confounding variable is time-invariant and when it is time-varying. Method: Types of confounding are described ...

The S = 1/2 Heisenberg antiferromagnet in the ladder geometry is studied as a model for the spin degrees of freedom of SrCu2O3. The susceptibility and the spin echo decay rate are calculated using a quantum Monte Carlo technique, and the spin-lattice relaxation rate is obtained by maximum entropy analytic continuation of imaginary time correlation functions. All calculated quantities are in rea...