In this paper, the heat transfer to the fluid, passing through the double forward facing step (FFS) channel with square obstacle is enhanced by Taguchi’s S/N ratio analysis. Flow through the forward facing step channel has a wide range of applications in thermal systems due to its flow separation and subsequent reattachment, which in turn enhances the heat transfer. Flow separation and reattach...

We discuss the nonabelian world-volume action which governs the dynamics of N coincident Dp-branes. In this theory, the branes’ transverse displacements are described by matrix-valued scalar fields, and so this is a natural physical framework for the appearance of noncommutative geometry. One example is the dielectric effect by which Dp-branes may be polarized into a noncommutative geometry by ...

Each year, about one third of the population over 65 years of age experiences at least one fall (Perry, 1982). Assessment of the incidence of falls and the prevalence, intensity, and covariates of fear of falling among community-based elderly persons was conducted through interviews of 115 residents in a housing development (mean age = 78 years). Fifty-three percent reported having fallen in re...

We consider regression problems where the number of predictors greatly exceeds the number of observations. We propose a method for variable selection that first estimates the regression function, yielding a “preconditioned” response variable. The primary method used for this initial regression is supervised principal components. Then we apply a standard procedure such as forward stepwise select...

OBJECTIVES To assess the use of the Voluntary Step Execution Test to identify fallers. DESIGN Cross-sectional retrospective. SETTING Two self-care, residential facilities. PARTICIPANTS a total of 100 healthy old volunteers (mean age = 78.4 +/- 5.7). MEASUREMENTS The study investigated the use of the Voluntary Step Execution Test to identify fallers under single and dual-task conditions....

BACKGROUND Prevention of falls in the elderly is a public health target in many countries around the world. While a large number of trials have investigated the effectiveness of fall prevention programs, few focussed on interventions embedded in the general practice setting and its related network. In the Prevent Falls (PreFalls) trial we aim to investigate the effectiveness of a pre-tested mul...

background: sleep and rest are basic physiological human needs. nurses work irregularly in morning, afternoon, and evening shifts; therefore, they are at greater risk of sleep problems than others. the aim of this study was to identify the factors related to sleep quality of nurses at rafsanjan university of medical sciences, iran. materials and methods: this cross-sectional study was conducted...