Minia University

About: Minia University is a education organization based out in Minya, Egypt. It is known for research contribution in the topics: Population & Medicine. The organization has 4967 authors who have published 8986 publications receiving 108384 citations.

AC conductivity and dielectric measurements of metal-free phthalocyanine thin films dispersed in polycarbonate

Abstract: The dielectric constant and the dielectric loss of thin films of metal-free phthalocyanine dispersed in polycarbonate using ohmic gold electrodes are investigated in the frequency range 20–105 Hz and within the temperature range 300–388 K. The frequency dependence of the impedance spectra plotted in the complex plane shows semicircles. The Cole–Cole diagrams have been used to determine the molecular relaxation time, τ, The temperature dependence of τ is expressed by thermally activated process. The AC conductivity σ AC (ω) is found to vary as ωs with the index s⩽1, indicating a dominant hopping process at low temperatures. From the temperature dependence of AC conductivity, free carrier conduction with mean activation energy of 0.33 eV is observed at higher temperatures. Capacitance and loss tangent are found to decrease with increasing frequency and increase with increasing temperature. Such characteristics are found to be in good qualitative agreement with existing equivalent circuit model assuming ohmic contacts.

Life Style Factors Associated with Premenstrual Syndrome among El-Minia University Students, Egypt

Abstract: Aim. To determine the score and frequency of premenstrual syndrome (PMS) among female college students and to detect the possible risk factors of PMS. A trial of life style modification regarding prevention and control of PMS symptoms was carried out using counseling. Materials and Methods. A cross-sectional study was conducted on 253 El-Minia University unmarried female students. A self-administered questionnaire inquiring about symptoms of PMS in the previous three months and risk factors possibly related to it was used. PMS score was calculated. Multiple regression analysis was performed to determine which of several biopsychosocial and dietary factors influenced PMS. Life style modification counseling was done to prevent and control PMS. Results. The study revealed that 80.2% of the participants experienced various degrees of PMS symptoms which were significantly associated with a family history of PMS, physical inactivity, habitual excess consumption of coffee, BMI, frequent consumption of fast food, and smoking, but these factors explained only 52% of the variability in the logistic regression model. Conclusion. We recommend the introduction of a reproductive health component into school and college health education programs and encourage female adolescents and young adults to adopt a healthy behavior.