In this study, the remaining life of PC sleepers is evaluated from viewpoint fatigue PC-steels sleepers. Specifically, a method acquiring stress waveform during train running developed. Furthermore, using waveform, we calculate strength in consideration occurrence probability wheel loads actual measurement, and quantitatively evaluate PC-steels. The result study shows that for post-tension type...

Track thermal buckling is one of the primary safety issues continuously welded rail tracks. It has been shown that transition zones open deck steel bridges are more prone to track buckling, as loads from bridge and lower lateral resistance in this region can destabilize plane. The aim paper assess possibility reinforcing ballast layer with geotextiles mitigate problem zones. To do so, a number ...

in this research, the structural behavior of timber and concrete sleepers in a standard railway turnout is evaluated, in the case of raising speed. in approaching this evaluation, current practices in the structural analysis of sleepers are surveyed and then, the sensitivity analysis with abaqus software is made based on selected criteria (bending and shear stresses as well as contact pressure)...

There appears to be some inconsistency in how normal sleepers (controls) are selected and screened for participation in research studies for comparison with insomnia patients. The purpose of the current study is to assess and compare methods of identifying normal sleepers in insomnia studies, with reference to published standards. We systematically reviewed the literature on insomnia patients, ...

OBJECTIVES To examine age-related differences in self-reported sleep quality and their associations with health outcomes across four domains: physical health, cognitive health, mental health and neural health. SETTING Cambridge Centre for Ageing and Neuroscience (Cam-CAN) is a cohort study in East Anglia/England, which collected self-reported health and lifestyle questions as well as a range ...

Lattice-type bi-block reinforced concrete (RC) sleepers have been widely used for cast-in-place slab tracks. However, the standards manufacturing, inspection, and performance verification of lattice-type RC are not well established, even when such a sleeper is critical component track. Therefore, it necessary to develop new standard sleepers. In this study, requirements relevant were investigat...

Understanding how stimulant drugs affect memory is important for understanding their addictive potential. Here we examined the effects of acute d-methamphetamine (METH), administered either before (encoding phase) or immediately after (consolidation phase) study on memory for emotional and neutral images in healthy humans. Young adult volunteers (N = 60) were randomly assigned to either an enco...

INTRODUCTION This study explored the associations between sleep duration and emotion regulation among urban black women (mean age=59 ± 7 yrs). METHOD Eligible women (n=523) provided sociodemographic data during face-to-face interviews. We used the Comprehensive Assessment and Referral Examination Physical to measure health status; women also estimated their habitual sleep duration. We utilize...

The properties of concrete with complex chemical additives to improve the technology for production sleepers from prestressed are discussed in article. With use under heat-moisture processing, at a temperature 40°C, there was no decrease strength cement stone and sufficient initial stage curing period, 44.7 MPa; determined addition Glenium 27 S - 1.0% hardening accelerator Master X -Seed 100 1....