Mean flow and spiral defect chaos in Rayleigh-Benard convection

We describe a numerical procedure to construct a modified velocity field that does not have any mean flow. Using this procedure, we present two results. Firstly, we show that, in the absence of mean flow, spiral defect chaos collapses to a stationary pattern comprising textures of stripes with angular bends. The quenched patterns are characterized by mean wavenumbers that approach those uniquely selected by focus-type singularities, which, in the absence of mean flow, lie at the zig-zag instability boundary. The quenched patterns also have larger correlation lengths and are comprised of rolls with less curvature. Secondly, we describe how mean flow can contribute to the commonly observed phenomenon of rolls terminating perpendicularly into lateral walls. We show that, in the absence of mean flow, rolls begin to terminate into lateral walls at an oblique angle. This obliqueness increases with Rayleigh number.Comment: 14 pages, 19 figure

Psychiatric morbidity and acute hospitalization in elderly people

10.1017/S1041610206003346International Psychogeriatrics184701-71

Use of complementary and alternative medicines and mental disorders in community-living Asian older adults.

Archives of gerontology and geriatrics503243-24

Religion, health beliefs and the use of mental health services by the elderly

10.1080/13607863.2010.508771Aging and Mental Health152143-149AMHT

Ethnic variations in dementia: The contributions of cardiovascular, psychosocial and neuropsychological factors

10.1159/000275668Dementia and Geriatric Cognitive Disorders292131-13

Juvenile psoriasis in European and Asian children: similarities and differences

BACKGROUND: The first manifestations of psoriasis begin in childhood in more than one-third of patients. However, epidemiological data of juvenile psoriasis are lacking. OBJECTIVES: To compare Dutch (NL group) and Singaporean (SG group) children with psoriasis with the aim of studying the characteristics of juvenile psoriasis and to highlight similarities and differences between these different ethnic groups. METHODS: Data were collected from 207 patients younger than 18 years diagnosed with psoriasis from Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands and the National Skin Centre, Singapore. Results : A striking difference in familial distribution was found, with more Dutch children having an affected family member (73.3% vs. 13.6%). Presence of itch and triggering factors were more common among Dutch children (80% vs. 14.2% and 33.3% vs. 7.4%, respectively). However, both groups shared similar triggering factors like stress and infections. Other similarities included mean age at presentation (NL group 11.3 years; SG group 14.1 years) and gender ratio (NL group, M/F 1 : 1.1; SG group, M/F 1 : 1.4). Plaque psoriasis was the most common type in both cohorts while guttate and pustular psoriasis were rare. In both groups, the head, followed by the limbs, was the most common site involved. Similar proportions of children in both countries had nail involvement and psoriatic arthritis was rare. CONCLUSIONS: The disparity in familial distribution may point to genetic differences between the two groups. Further studies to evaluate this difference in familial distribution may contribute to the understanding of the pathogenesis of psoriasis

Resilience and burden in caregivers of older adults: Moderating and mediating effects of perceived social support

10.1186/s12888-018-1616-zBMC Psychiatry1812

Mutant p53 accumulates in cycling and proliferating cells in the normal tissues of p53 R172H mutant mice

10.18632/oncotarget.4956Oncotarget62017968-1798

Circulating microRNAs in sera correlate with soluble biomarkers of immune activation but do not predict mortality in ART treated individuals with HIV-1 infection: A case control study

10.1371/journal.pone.0139981PLoS ONE1010e013998