The power grid defines one of the most important technological networks of our times and sustains our complex society. It has evolved for more than a century into an extremely huge and seemingly robust and well understood system. But it becomes extremely fragile as well, when unexpected, usually minimal, failures turn into unknown dynamical behaviours leading, for example, to sudden and massive...

It has been suggested by Sjöstrand and his colleagues that an index of scatter by the ocular media may be derived from contrast sensitivity measured with and without a glare source. This index was tested under different conditions of stimulus luminance and found not to be constant and thus to not reflect a property of the media.

The study of the dynamics taking place during power system blackouts is a subject that receives continuous attention in view of its inherent complexity and relevant consequences. Within this context, the paper aims at studying the role of the frequency control reserves (FCRs) on the cascading outages and the relevant short-term dynamics associated with the blackout mechanisms. The relationship ...

We examined the prevalence of dieting and negative eating attitudes among 2279 females (aged 10-14 years) in southern Ontario. Self-report questionnaires revealed that 29.3% of the girls were currently trying to lose weight and 10.5% had scores greater than the clinical threshold for disordered eating (Children's version of the Eating Attitudes Test [ChEAT] score > or = 20). Those with elevated...

Abstract Background Postural orthostatic tachycardia syndrome (POTS) is a common cardiovascular autonomic disorder characterized by excessive heart rate increase on standing and symptoms of intolerance, posing significant limitations functional capacity. No objective tool exists to classify symptom burden in POTS. Methods We conducted case-control study 62 POTS patients 50 healthy controls comp...

This study examined the main and interaction effects of gender, traditional gender role orientation, and media-influenced sociocultural values and ideals about appearance in a sample of 96 Latino adolescents controlling for age, country of origin, and BMI. Girls and less traditionally oriented youth reported significantly more disordered eating and appearance concerns than did boys and more tra...

The cultural equivalence of psychological outcome measures remains a major area of investigation. The current study sought to test the factor structure and factorial invariance of the Brief Symptom Inventory-18 (BSI-18) with a sample of adult individuals of Mexican descent (N=923) across nativity status (U.S.- vs. foreign-born), language format (English vs. Spanish), and gender. The results sho...