• Evaluation of the behaviour a railway track supported by alternative sleepers. Use ballast box test to represent single sleeper section track. Digital Image Correlation technique for measuring sleepers’ deflection profile. Sleepers with low modulus will have W-shape Local deformation at rail seat can account up 10 % total deflection. Alternative technologies replacement timber are made materi...

To determine some of the risks and benefits of being a long or short sleeper, psychological adjustment, lifestyle, and sleep parameters were investigated in 239 older adults. Responses of people who slept well and who were either long or short sleepers were studied on 48 variables investigating sleep parameters and sleep-related affect and beliefs; daytime fatigue and sleepiness; demographic fa...

Introduced species represent one of the most serious global threats to biodiversity. In this field-based study, we assessed behavioural responses of brood tending cichlid fish to an invasive predator of their offspring. This was achieved by comparing parental defence responses of the endangered arrow cichlid (Amphilophus zaliosus), a fish species endemic to the crater lake Apoyo in Nicaragua, t...

This paper presents the results of a series of hollow cylinder tests carried out to investigate the role of drainage conditions on the response of railway track foundation materials during cyclic loading. Three sand–clay mixes were tested. It was found that, below a certain cyclic shear stress threshold, and depending on the drainage conditions, changes in principal stress direction should not ...

BACKGROUND Approximately 30% of the U.S. population reports recurrent short sleep; however, perceived sleep need varies widely among individuals. Some "habitual short sleepers" routinely sleep 4-6 hr/night without self-reported adverse consequences. Identifying neural mechanisms underlying individual differences in perceived sleep-related dysfunction has important implications for understanding...

The handling of mistakes in the mathematics classroom is an area in which only little research is done so far. In mathematics education there are, in fact, several investigations about students’ mistakes from a diagnostic perspective, but hardly any studies on the question how teachers react in concrete mathematics lessons. In this article theoretical aspects and results of different video stud...

Prestressed concrete (PSC) is one of the most reliable, durable and widely used construction materials, which overcomes the weakness of concrete in tension by the introduction of a prestress force. Smart strands enabling measurement of the prestress force have recently been developed to maintain PSC structures throughout their lifetime. However, the smart strand cannot give a representative ind...

Previous studies have addressed railway turnouts (switches and crossings), but research on the performance of 1000 mm gauge is limited. At present, wooden sleeper structures are used at in Vietnam. However, these many disadvantages operation process. This paper evaluates new prestressed bearer (PSB) for turnouts, designed gauge, to overcome a sleeper. Test samples PSB were manufactured factory,...

Billions of sleepers are used on railways around the world today. As importance in transportation sector is increasing, demand for also increasing. Although wooden and steel were rail systems past, today most widely sleeper type reinforced concrete sleepers. Among these sleepers, pre-stressed used, popular that can be produced many countries. The two main production methods ribbed system non-ri...

The purpose of the following paper is to present author’s experimental field investigations a jointless railway track subjected generated imperfection and analysis response applied static loads. An optical measurement system, Pontos, was used for dynamic track’s deflections in 3D. allow us recommend direct application this system non-contact measurement, visualization simulated defects track, a...