Association of fear of COVID-19 and preventive behaviors (PB) against COVID-19 in Iran

Introduction: The world is currently experiencing a pandemic of COVID-19. The pandemic may affect physicaland mental health. Therefore, this study aims to investigate the fear of COVID-19 and study the relationshipbetween fear of COVID-19 and preventive behaviors against COVID-19. Material and methods: We conducted a web-based cross-sectional study to evaluate the fear of COVID-19 andpreventive behaviors against COVID-19 among the volunteer population in Golestan Province, Iran in May 2020 andJune 2020. The online questionnaire included the Fear of COVID-19 Scale (FCV-19S) and the prevention behaviorsagainst COVID-19, which are used to assess the fear and prevention behaviors of the population, respectively.The data were presented by mean and frequency. Multiple linear regression analysis was performed to identifyfactors associated with Fear of COVID-19 at a significant level of 0.05 in Stata 14. Results: A total of 734 of the 900 individuals contacted completed the survey, with a participation rate of 81.5%.The mean age of the participants was 33.97 ± 10.68 years and 375 (51.9%) were females. The mean Fear ofCOVID-19 score in the participants was 19.69 ± 5.96. There was a significant positive correlation between Fearof COVID-19 and preventive behaviors (r = 0.19, p < 0.001). Multiple linear regression analysis showed participantswith a higher perceived threat of COVID-19, women, married participants, health workers and peoplewith underlying diseases had higher levels of fear of COVID-19. Conclusions: The fear of COVID-19 in Iranian society is high, which indicates the need to pay attention tothe mental health in pandemic conditions. Appropriate intervention action can be designed and implementedaccording to the factors that affect fear. In addition, it should be noted that people with less fear are less likelyto observe the COVID-19’s preventative behaviors

The effect of Laser Shock Peening on Fatigue Life Using Pure Water and Hydrofluoric Acid As a Confining Layer of Al – Alloy 7075-T6

Laser shock peening (LSP) is deemed as a deep-rooted technology for stimulating compressive residual stresses below the surface of metallic elements. As a result, fatigue lifespan is improved, and the substance properties become further resistant to wear and corrosion. The LSP provides more unfailing surface treatment and a potential decrease in microstructural damage. Laser shock peening is a well-organized method measured up to the mechanical shoot peening. This kind of surface handling can be fulfilled via an intense laser pulse focused on a substantial surface in extremely shorter intervals. In this work, Hydrofluoric Acid (HF) and pure water as a coating layer were utilized as a new technique to improve the properties and to harden the treated surface of the Al -alloy 7075-T6. Fatigue life by means of laser peened workpieces was improved to 154.3%, 9.78%, respectively, for Hydrofluoric (HF) and pure water compared to un-peened specimens. And the outcomes of Vickers hardness test for laser shock peening with acid and pure water as well as un-peened specimens were 165.2HV30, 143.95HV30 and 134.7HV30, respectively showed a significant improvement in the hardness property