Abstract Brake systems are essential for the speed regulation or braking of a high-speed train. The vehicle dynamic performance under condition is complex and directly affects reliability running safety. To reveal behaviour in process, comprehensive trailer car dynamics model (TCDM) considering brake established this paper. interactions between system other connected components achieved using d...

In this study, material and dynamic stress experiments are combined with finite element (FE) simulations to reveal the fracture mechanism of wheelset lifting apparatus, a structural design optimization scheme based on double-layer Kriging surrogate model is proposed. The apparatus first clarified through analysis macro/micro tests. Static strength modal analyses then performed perfect in terms ...

background: the existence of fluoride ion in potable water has distinctive effects on human health. fluoride is attracted by positively charged calcium in teeth and bones due to its strong electro-negativity which results in dental, skeletal, and non-skeletal forms of xuorosis and associated health complaints in children as well as adults. methods: water samples from groundwater used for drinki...

background solvents such as benzene and toluene are commonly used in tire manufacturing, and significant occupational exposure to these chemicals adversely affects the health of workers. in biological monitoring, a complementary method for personal monitoring, the internal absorbed dose is measured and individual, environmental, and exposure differences are taken into consideration. conclusions...