In the first European Community Respiratory Health Survey (ECRHS I), an excess asthma risk was associated with high exposure to gases and fumes, mineral and biological dusts. In a 9-year follow-up study (ECRHS II), the aim was to study if welding at work increases the risk of asthma symptoms, wheeze and chronic bronchitis symptoms. The study also aimed to identify specific welding risk factors....

To weaken the harm of Al–Si coating and increase strength welded joints, variable thicknesses Ni foil (Ni, an austenitic formation element) were added to lap laser welding Al–Si-coated 22MnB5 hot stamping steel/galvanized steel joints. The joints’ weld appearance, microstructure, mechanical properties explored. altered from X shape a Y with increased thickness foil. During welding, was melted d...

physical and mechanical properties of alfalfa (medicago sativa, l.) grind are required for optimum design of equipment used in transporting, processing and storage of the material. this study was conducted to determine the effect of particle size (2.38, 3.36 and 4.76 mm) and moisture content (8, 9.3 and 11% wb) on some physical and mechanical properties of alfalfa grind. these properties includ...

The study evaluates corrosion resistance of steel profiles in contact with monolithic foam concrete a thickness 5 and 10 mm. There are two types samples: structural ones cold-formed galvanized ones. A visual examination samples exposed to high temperature relative humidity is carried out. made full provides. Metal passivation (formation protective film) occurs due the alkalinity concrete. pH va...