Abstract: To ensure the rail transportations safety, evaluation of fatigue behavior of the rail steel is necessary. High cycle fatigue behaviour of a rail steel was the subject of investigation in this research using fracture mechanics. Finite element method (FEM) was used for analyzing the distribution of the stresses on the rail, exerted by the external load. FEM analysis showed that the ...

Dedicated to Professor Gad M. Landau, on the occasion of his 60th birthday

The aim of this paper was to present an optimized method in order to use maximum capacity of the photovoltaic panels. In this regard, we presented a method for the maximum power point tracking in the photovoltaic systems by using the neural networks and adaptive controller. In the proposed system, we estimated an error by using neural network. If this error is lower than the allowable systems e...

The maximum allowable dose levels (MADL) for di(2-ethylhexyl)phthalate (DEHP) by the oral route of exposure are 410 micrograms/day (μg/day) for adults, 58 μg/day for infant boys (29 days to 24 months of age) and 20 μg/day for neonatal infant boys (birth to 28 days of age). These values are based on the male reproductive effects of DEHP observed in the study by David et al. (2000a). As specified...

To determine safe working conditions in emergency situations at petro-chemical plants in the Netherlands a study was performed on three protective clothing combinations (operator's, firefighter's and aluminized). The clothing was evaluated at four different heat radiation levels (3.0, 4.6, 6.3 and 10.0 k∙W∙m-2) in standing and walking posture with a thermal manikin RadMan™. Time till pain thres...

Trichlorethylene (tri) is a solvent widely used in mechanical engineering, where it is employed mainly for cleansing and degreasing. Its main advantages are that it is non-inflammable; is an excellent degreasing agent, and is relatively inexpensive. Although tri was for a long time considered to be only very mildly toxic, there has been, in recent years, a great increase in research and investi...

Background: Radiation in space poses a threat to humans embarked on missions to the Moon or Mars. Several studies deal with allowable doses, levels of radiation doses in space, and effects of various forms of shielding. The recent shift in emphasis from "point estimates" to 95% confidence intervals adds significantly to the challenge in designing human space missions. Recent reports issued by N...

background: noise-induced hearing loss (nihl) is one of the most common occupational illnesses. most of the studies on nihl were conducted at high noise levels that people are rarely exposed to but in industries. the function of the outer hair cells (ohcs) is impaired after exposure to industrial noise. distortion product otoacoustic emissions (dpoaes) are useful in examination of noise-induced...