Academic Science Journal

The effect of Nano composite materials (CuFe2O4 and ZnFe2O4) was studied for removal of heavy metals (Cd (II) and Pb (II)) from wastewater by batch adsorption method and explain their effect on the antimicrobial effectiveness on gram positive and negative bacteria. Nano composite materials were characterized by XRD where the result indicates that the average crystallite sizes were around 36.19 nm for ZnFe2O4 and 12.22 nm for CuFe2O4.The effect of contact time, adsorbent dose, pH and type of adsorbents was used to find the optimum condition for removal of Cd(II) and Pb(II) ions .The equilibrium adsorption data was good fitted to the Langmuir and Freundlich isotherm models, and the pseudo first-order kinetic model showed the excellent fit in adsorption equilibrium capacity.

Since Arabic video classification is not a popular field and there isn’t a lot of researches in this area especially in the educational field. A system was proposed to solve this problem and to make the educational Arabic videos more available to the students. A survey was fulfilled to study several papers in order to design and implement a system that classifies videos operative in the Arabic language by extracting its audio features using azure cognitive services which produce text transcripts. Several preprocessing operations are then applied to process the text transcript. A stochastic gradient descent SGD algorithm was used to classify transcripts and give a suitable label for each video. In addition, a search technique was applied to enable students to retrieve the videos they need. The results showed that SGD algorithm recorded the highest classification accuracy with 89.3 % when compared to other learning models. In the section below, a survey was introduced consisting of the most relevant and recent papers to this work.

Lidskii's theory is considered one of the most important and recent theories for calculating the following categories and the relationship between them and the eigenvalues. This theory provides an easier way to prove the existence of the eigenvalues, and hence to prove the existence of solutions for some kind of problems.
This thesis article to prove that there are solutions to some problems for which the computation of eigenvalues is very complex and to prove that the existence of eigenvalues is also complex, in our work we try to take advantage of the fact that calculating the trace is much easier than calculating eigenvalues. Lidskii's theorem gives the relationship between Trace and eigenvalues and gives us a way to prove the existence of eigenvalues.

The adsorption of Cd (II), Ni (II) and Cu (II) ions on nanoϒ-Al2O3 isotherms study indicate that (Langmuir, Freundlich and Elovich) be the most excellent model described removal of Cu (II) ion. Jovanovic and Harkins-Jura were found to be the most excellent one described removal of Ni (II) ions and the all models are less suitable for Cd (II) ions. All these were noted from the correlation coefficients values. The highest removal percentages obtained for ions were 92.045 % of Cd (II), 93.175 % of Ni (II) and 93.685% of Cu (II). FESEM was measured to find out the average particle size of nanoparticles and EDXA was used for measuring purity.

Discotic liquid crystal compounds were synthesized and characterized. Liquid crystalline texture of these compounds was investigated by polarized optical microscopy (POM). The Hartree-Fock approximation (HF) was used to calculate theoretical molecular parameters for synthesized compounds such as optimization, hardness, EHOMO, ELUMO, and energy gap using the Gaussian 09W program.

Schiff's Bases were synthesized from the reaction of p-amino benzoic acid and
alkoxybenzaldehyde in absolute ethanol and reacted with (E)-3-((4-hydroxybenzylidene)
amino) phenol used DCC (N,N'-Dicyclocarbodiimide) and DAMP (4-(Dimethylamino)
pyridine ) to 3-(((E)-4-((4-(((E)-4 alkoxy benzylidene) amino) benzoyl) oxy) benzylidene)
amino) phenyl4- (E)- 4-alkoxy benzyli dene ) amino) benzoate. The structures of the products
were confirmed by their melting points, FT-IR, 1HNMR spectra.