قسم الفيزياء

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45

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أ. علي امحمد بشير المجاهد

علي المجاهد هو احد اعضاء هيئة التدريس بقسم الفيزياء بكلية التربية قصر بن غشير. يعمل السيد علي المجاهد بجامعة طرابلس كـمحاضر مساعد منذ 2016-03-01 وله العديد من المنشورات العلمية في مجال تخصصه

منشورات مختارة

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Effect of UV irradiation on linear optical parameters of PVA-MoO3 Film

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)
Publisher's website

Study of MoO3 doping effect on linear and Non-linear optical properties of Cellulose acetate (CA) films

The goal of this study was to investigate the optical properties of the prepared CA-MoO3 nanocomposites films. CA has been chosen as a host matrix and then doped with MoO3 with different concentrations (2.5, 5, 10 and 15wt. %) of MoO3 by using casting procedure. CA-MoO3 films were characterized by UV-Visible spectrophotometer within the wavelength range of 200 nm-800 nm. The Linear optical parameters (transmission (T), extinction coefficient (K), reflectance (R), refractive index (n), real (ε1) and imaginary (ε2) part of the dielectric constant and optical conductivity (σopt)) of CA-MoO3 films were obtained from absorption spectra. The volume (VELF) and surface (SELF) energy loss function of CAMoO3 films were obtained by complex dielectric constant. The Dispersion parameters (dispersion energy (Ed), oscillation energy (E0), static dielectric constant (ε0) and static refractive index (n0)) were calculated using theoretical Wemple-DiDomenico model. The nonlinear optical susceptibility x(1), x(3) and nonlinear refractive index n2 were evaluated from the linear optical parameters using semiempirical relation. The results show that the Linear and nonlinear optical parameters change with the increase of molybdenum trioxide concentration, where, the transmittance, oscillator energy, the volume (VELF) and surface (SELF) energy loss decreases with the increase of MoO3 concentration.
Mohamed Abu. Hamza, Saad E. Sharada(8-2022)
Publisher's website

حل مسالة القيمة الذاتية للنمطين الكهربي TE و المغناطيسي TM المستعرضين لالفالم الرقيقة دورية الطبقات, مجلة العلوم االنسانية و التطبيقية

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)
Publisher's website