elaheh saffari

Cast Al-15Mg2Si composites due to appropriate specific strength and tribological properties are ‎widely used in automotive and aerospace industries. The improved properties of these composites ‎are governed by the correct controlling of morphology, size, and distribution of primary Mg2Si ‎particles. In this study the effect of solidification cooling rate (chill modification) was investigated ‎on structure and quality index of Al-15Mg2Si composite. The casting operation was performed in ‎different molds with varying cooling rates of 2.7, 5.5, 17.1, and 57.5 °C/s. According to the ‎microstructural observation and image analysis results, increasing the solidification rate resulted in ‎refinement of primary Mg2Si particles and improvement of their distribution in the matrix. The ‎increased solidification cooling rate, moreover, refined the grains so that increasing cooling rate ‎from 2.7 to 57.5 °C/s resulted in 93% reduction in grain size. These microstructural variations ‎improved the composite tensile strength, fracture strain, and quality index. The quality index of ‎composite solidified at 2.7 °C/s was found to be lower than that of composite solidified at cooling ‎rate of 57.5 °C/s by 240%.

Female sexual dysfunction (FSD) defines as any disorder in the process of sexual contact including 6 main domains, desire, arousal, lubrication, orgasm, orgasm satisfaction and pain. This study was conducted to evaluate prevalence of sexual dysfunction disorder in women with migraine headache and also find the associated factors related to migraine characteristics. A total of 69 eligible woman patients fulfilling criteria for migraine participated in this study. The Female Sexual Function Index (FSFI), a multi-dimensional self-report implement for appraisal of Female Sexual Function during the past month were utilized in this study. The information related to migraine including frequency, duration of headache attack, severity of headache according to visual analog scale (VAS) score and headache impact test (HIT) score were obtained using a self-administrated questionnaire. About 68.4% of patients had an FSFI score < 28. In domains of desire 73.7%, arousal 64.9%, lubrication 21.1%, orgasm 33.3%, satisfaction 17.5%, and pain 40.4% of patients reported some degree of dysfunction. Among variables related to migraine characteristics, only a significant association between frequency and sexual dysfunction were recorded (P < 0.05). FSD is prevalent among migraine patients. The frequency of a migraine attack is associated with FSD. Serotonin mechanisms such as 5HT2, 5HT3 agonist have been hypothesized as a shared etiology for migraine and sexual dysfunction.