A sample of polyvinyl alcohol doped with 5% by weight of molybdenum oxide forming (PVA-MoO3) composite film was prepared using the solution casting technique. The film was exposed to UV irradiation (366nm wavelength) for different periods of time ranging from 5 to 60 min (5, 10, 20, 30, 40, 50 and 60 min) at room temperature. A computerized double beam UV-VIS spectrophotometer was used to characterize the sample film. The linear optical parameters such as (n) and (k) real and imaginary parts of refractive index, optical conductivity and dielectric constant were calculated. Also, the oscillator energy and dispersion energy (E0, Ed) were evaluated. The experimental results showed that the extinction coefficient (K), reflectance (R), refractive index (n), dispersion energy (Ed), real (ε1) and imaginary (ε2) parts of dielectric constants and optical conductivity (σop) are increased, where, the transmittance (T) and oscillator energy (E0) decreases with the increase of the exposure radiation time. Also, the results showed that (PVA-MoO3) composite film can be used as UV sensor.
Mohamed Abu. Hamza, Saad E. Sharada(8-2022)

Novel Glass system with a formula of xBaO.(30− x).Na2O.70B2O3 (0 ≤x ≤ 30 mol%) have been prepared and examined. The BNaBax-glass structure was used to estimate the influence of BaO addition on the density and molar volume. There is a linear increase in density with increasing BaO concentration. The molar volume varies oppositely. Furthermore, the impact of barium oxide on the gamma and neutron radiation shielding capacities of xBaO.(30− x).Na2O–70B2O3 glasses have been investigated for radiation shielding applications. The μm: coefficient of mass attenuation for BNaBa-0, BNaBa-5, BNaBa-10, BNaBa-15, BNaBa-20, BNaBa-25, and BNaBa-30 glass samples were simulated using the Monte Carlo simulation FLUKA algorithm, in photon energy ranged 0.015MeV–15MeV, the resulting μm simulated results were compared with the Phy-X/PSD platform. The T1/2: half-value layer, λ: mean free path, Zeff: effective atomic number, EBF: exposure, and EABF: energy absorption buildup factors of the BNaBax-glass samples have been estimated. The results presented that a BNaBa-30-glass with a 30-mol.% concentration of BaO has the best gamma and neutron shielding capabilities than the other investigated BNaBax-glass samples.
Fawzeya Mohamed Gomaa Gharghar(1-2023)

حل مسالة القيمة الذاتية للنمطين الكهربي TE و المغناطيسي TM المستعرضين لالفالم الرقيقة دورية الطبقات. arabic 241 English 4
عبدالسلام إمحمد إبراهيم ابوبكر, عبدالعزيز أحمد الكويلاني, علي امحمد بشير المجاهد(7-2019)