Abstract Modern wearable devices calculate a numerical metric of sleep quality (sleep feedback), which are intended to allow users monitor and, potentially, improve their sleep. This feedback may have negative impact on pre-sleep cognitive arousal, and subjective sleep, even in healthy sleepers, but it is not known if this the case. pilot study examined poor false feedback, upon arousal continu...

As prestressed concrete sleepers are continuously exposed to various environmental and loading conditions, it is increasingly crucial analyse their current future serviceability performance. In practice, the main cause of cracking in usually induced by impact loads. The most heavily influenced sections midspan rail-seat area sleepers. This paper investigates effects time-dependent strength degr...

BACKGROUND Inconsistent findings in previous studies of the association between sleep duration and changes in body mass index (BMI) may be attributed to misclassification of sleep duration fluctuations over time and unmeasured confounders such as genetic factors. The aim of the present study was to overcome these failings by using repeated measurements and panel data analysis to examine the sle...

OBJECTIVES Several studies have suggested that patients who experience insomnia report a number of significant impairments. However, despite this literature, fewer studies have focused on the burden of insomnia among patients in Japan. The objective of the current study is to extend this work in Japan to further understand the effect of insomnia on health-related quality of life (hrQOL). Furthe...

Wheel flats induce high-impact loads with relevance for the safety of vehicle in operation as they can contribute to broken axles, hot axle boxes, and damaged rolling bearings wheels. The high also damage track components such rails sleepers. Although this subject has been studied numerically experimentally over last few years, wheel flat problem focused on ballasted tracks, there is a need und...

A sensor is a battery-operated small computer with an antenna and a sensing board that can sense magnetism, sound, heat, etc. Sensors in a network can use their antennas to communicate in a wireless fashion by broadcasting messages over radio frequency to neighboring sensors in the same network. In order to lengthen the relatively short lifetime of sensor batteries, each sensor in a network can...

Crumb rubber (CR) has been proposed to apply in the ballast or sub-ballast layer for degradation mitigation and vibration (noise) reduction. The CR can change stiffness, which affect train-track-subgrade dynamic performance cause travel comfort safety issues. Towards this, this study aims at confirming 1) how much application of train layer; 2) what extent CR-ballast distribute loadings reduce ...

investigations on vibration behaviors of railway track systems were attempted in this research. this was made by conducting a comprehensive field investigation into the free vibration of track systems and response of tracks to train moving loads. in-situ modal analysis was used in a railway track field as an efficient method of investigating dynamic properties of railway track systems. natural ...