تمت دراسة تأثير أيون الصوديوم على الخواص الفيروكهربائية للمركب (NaxBa1-xTiO3) بقيم (x=0.0,0.3,0.4,05)، الذي تمّ تحضيره بطريقة (تحضير المواد السيراميكية الالكترونية المنشورة والمألوفة). التأثير لدرجة الحرارة في المدى (RT-160ºC) والتردد في المدى (0.01,0.1,1KHz) على السماحية الكهربائية، وكذلك على الفقد العزلي الكهربائي، في الوسط الفيروكهربائي. نتائج أشعة –X [XRD]. تبين أن العينات النقية والمطعمة تتشكل في التركيب البلوري المتماثل عند درجة حرارة (1100ºC). عند درجات حرارة الأعلى من نقطة كوري، قيم السماحية النسبية تحقق قانون "كوري وايز" في المدى الباراكهربائي. طاقة التنشيط لكل العينات تمّ حسابها من منحنى آرهينيوس. Abstract The effect of sodium doping was studied on ferroelectric properties of (NaxBa1-xTiO3) with x= 0.0, 0.3, 0.4 and 0.5 prepared through solid-state route. The effect of temperatures in the range of (RT-160ºC), frequencies (0.01, 0.1 and 1 KHz), and doping ration on the dielectric permittivity and dielectric loss were studied in ferroelectric region. The X-ray diffraction [XRD] results indicate that pure and doped samples crystallize in to tetragonal symmetry on heat treatment at (1100ºC). Above the Curie temperature, the relative permittivity follows curi-weiss law in the paraelectric region. The activation energies were calculated from the (Arrhenius-plot) for all samples.
عبد الرحمن رجب علي النيفرو (2008)

In this paper, considers a solution of Maxwell's curl equations by using the finite-difference time-domain (FDTD) method. We simulated electromagnetic waves propagation in free space. The electric and magnetic fields generated in two cases to make a comparison between the models. All models were computed using the same parameters. This study showed that the intensities of the fields affected when adding three excited sources pointed in three locations. However, it was noted that three sources placed in the same location improved the distributions of the fields. Therefore, this difference in excitation position leads to change the image intensity distribution. arabic 7 English 43
Adel G Diyaf, Sedig S. Farhat(4-2017)

: Neodymium isotopes (Z=60) lie in the traditional rotational to transitional-spherical region that occurs at the range of deformed nuclei. The identity of 146−158 Neodymium nuclei have been determined in framework of Interacting Boson Model-2, a simulation program with NPBOS has been used to obtain the theoretical energy levels for Neodymium isotopes. The parameters of the best fit to the measured data are determined. The energy positive parity bands of those isotopes were calculated using (IBM-2) and then it compared with the experimental values. The mentioned isotopes ratios (E(4_1^+))/(E(2_1^+)) have calculated and also E-GOS curves (( E_γ)/I) have drawn as a function of the spin I, to classify symmetry of the nuclei. The electromagnetic transition probabilities B(E2) of these nuclei was calculated as well, where a good agreement for low lying energy states were obtained between experimental results and theoretical calculations. The results have been shown that the interested nuclei 152-158Nd have rotational characters SU (3), and O (6) symmetry is substantiated for 146-148Nd, as well as the critical point X (5) has been determined for 150Nd isotope.
D. Nasef, Najat S. Eshaftri, Ayad E. Ezwam, Suad M. Bogrin, Asma A. Elbendag, Sadiq M. El-kadi(12-2021)