Observations of damage to buildings in recent earthquakes indicate that some of the damage was in the area of welded joints.Due to the weakness in the joints, the idea of using a horizontal friction damper using brake pads in bracing openings, especially the chevron frame in steel structures has been proposed Which can be easily replaced after an e

Method of in situ gamma-ray spectrometry was used to discriminate contributions of 137Cs and natural radionuclides to ambient dose equivalent rate indoors in settlements located in the zones of radioactive contamination after the Chernobyl accident.The measurements using a portable scintillation gamma spectrometer-dosimeter were carried out in 115