Extending the study of spherically symmetric metrics satisfying the dominant energy condition and exhibiting singularities of power-law type initiated in [2], we identify two classes of peculiar interest: focusing timelike singularity solutions with the stress-energy tensor of a radiative perfect fluid (equation of state: p = 1 3 ρ) and a set of null singularity classes verifying identical prop...

background : occupational stress is a psychosocial dimension of occupational health concept on social determinants of health, especially, job & environmental condition. recently, staff network of different government universities of thailand have called higher education commission, and ministry of education, thailand to resolve the issue of gov-ernment education policy (e.g. wage inequity, poor...

in this paper, we investigate the canonical property of solutions of a system of differentialequations having a singularity and turning point of even order. first, by a replacement, we transform thesystem to the sturm-liouville equation with a turning point. using the asymptotic estimates for a specialfundamental system of solutions of sturm-liouville equation, we study the infinite product rep...

in order to determine the best index for evaluating maize genotypes, 15 maize inbred lines were evaluated in two planting dates, 6 july to coincide heat stress with pollination time and 27 july as normal planting to avoid high temperature during pollination and grain filling period, using a randomized complete block design with three replications, in shushtar city, in 2007. result showed that i...

in this paper, the problem of calculating the stress intensity factor (sif) for an orthotropic thick-walled cylinder with a small radial crack subject to internal pressure is considered. the crack is assumed to be an edge crack on the external radius of the cylinder. the stress intensity factor is calculated by superposition of an uncracked cylinder with uniform stress distribution and a cylind...

A third order shear and normal deformable plate/shell theory (TSNDT) and a stress recovery scheme (SRS) are used to predict stress singularities near edges of doubly curved composite laminated shells deformed statically with tangential and normal tractions applied on the shell major surfaces. In fluidstructure interaction problems both tangential and normal tractions may simultaneously act on t...