Journal of Taibah University for Science This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Spectroscopic and photochemical stability of polystyrene films in the presence of metal complexes
Publication date: Available online 28 March 2017 Source:Journal of Taibah University for Science Author(s): Emad Yousif, Raghad Haddad, Gamal A. El-Hiti, Rahimi M. Yusop Five metal complexes containing Ni(II), Cu(II), Zn(II), Cd(II) and Sn (II) metal and 4-amino-5-(pyridine-4-yl)-4H-1,2,4-triazole-3-thiol, have been prepared to be used for as photostabilizers for polystyrene. The additives (0.5% by weight) have been mixed with polystyrene in chloroform to produce modified PS using the casting method. PS films was irradiated (λ=250–380nm) at 6.02 × 10−9 ein·dm−3·s−1 light absorption intensity at room tempe...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

STATISTICAL ANALYSES AND RISK ASSESSMENT OF SOME POTENTIALLY TOXIC METALS (PTMS) IN CHILDREN ’s TOYS
Publication date: Available online 28 March 2017 Source:Journal of Taibah University for Science Author(s): A.O Oyeyiola, M.I Akinyemi, I.E Chiedu, O.T Adetunde, K.O Olayinka Chemical exposure to children, especially from toys is an engineering concern. The concentration and availability of some potentially toxic metals (PTM) in children’s toys were determined in order to assess the risk posed by these metals to children. Samples of 25 toys imported from China to Nigeria were purchased. Ternary acid digestion followed by Atomic Absorption Spectrophotometry was used to determine the concentration of the PTM in the ...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Spectroscopical and Computational investigation on Pharmacological activity on the structure of 1-Benzylimidazole
Publication date: Available online 28 March 2017 Source:Journal of Taibah University for Science Author(s): A. Madanagopal, S. Periandy, P. Gayathri, S. Ramalingam, S. Xavier, vladimir K. Ivanov The chemical and pharmacological activity of the compound; 1-benzylimidazole has been interpreted using vibrational, NMR and UV-Visible spectroscopic tools. The necessary data obtained by recording spectra of FT-IR, FT-Raman, NMR and UV-Visible. 1H and 13C NMR spectral chemical shift have been observed and investigated for the interpretation of origin of the antiparasitic, antifungal and antimicrobial activities. The elabor...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

A novel spectrophotometric method for the determination of copper ion by using Salophen Ligand, N,N ′-disalicylidene-2,3-diaminopyridine
In this study, a novel, selective and highly sensitive spectrophotometric method has been developed for the determination of copper(II) by using a new chromogenic reagent N,N′-bissalicylidene-2,3-diaminopyridine (H2IF). The absorbance is measured at λmax 414nm. Experimental conditions were optimized and Beer’s law was observed in the concentration range 6.35- 318μgL−1 of copper. The molar absorptivity of the complex was calculated and found to be 1.46×105 L mol–1 cm−1. The detection and quantification limits were calculated and found to be 6.38μgL−1 and 21.27μgL−1 respectively. The calculated relative st...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Volumetric and optical properties of ACE inhibitor captopril drug in aqueous-alcoholic mixtures
Publication date: Available online 28 March 2017 Source:Journal of Taibah University for Science Author(s): Santosh D. Deosarkar, Meenakshi P. Pawar, Atmaram D. Arsule, Rajendrakumar T. Sawale, Tukaram M. Kalyankar 5 Captopril is an angiotensin converting enzyme (ACE) inhibitor which is used for the treatment of hypertension and congestive heart failure. The article deals with the accurate measurements of densities and refractive indices of solutions containing captopril in pure solvents like water/methanol/ethanol/1-propanol and aqueous mixtures of methanol, ethanol and propan-1-ol of 30, 50 and 70vol % in wide con...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Antiplasmodial activities of ethanol extracts of Euphorbia hirta whole plant and Vernonia amygdalina leaves in Plasmodium berghei-infected mice
Publication date: Available online 28 March 2017 Source:Journal of Taibah University for Science Author(s): E.I.O. Ajayi, M.A. Adeleke, T.Y. Adewumi, A.A. Adeyemi The African continent is rich in both flora and fauna resources which have been extensively used locally in the treatment or cure of a wide variety of ailments. Enquiries into traditional folklore revealed that Euphorbia hirta and Vernonia amygdalina possess, among others, antiplasmodial properties for the treatment of febrile conditions. We therefore investigated the phytochemistry, antimalarial potencies, hepatic and renal toxicities of the crude ethanol ...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Analysis of toxic heavy metals of cigarettes by Instrumental Neutron Activation Analysis
Publication date: Available online 28 March 2017 Source:Journal of Taibah University for Science Author(s): M. Abd El-Samad, H.A. Hanafi The Instrumental Neutron Activation Analysis (INAA) technique was used to analyze 10 brands of cigarette sold in the Egyptian market. Concentrations of trace and major constituents were measured to better understand the hazardous effects of smoking Egyptian cigarette tobacco. The samples were irradiated at the core of the Second Research Egyptian Reactor ET-RR-2 and the induced activities were counted by <gamma>-ray spectrometry using an efficiency calibrated High Purity...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Some new dynamic Inequality on time scales in three variables
Publication date: Available online 29 March 2017 Source:Journal of Taibah University for Science Author(s): Deepak B. Pachpatte In this paper we obtain the estimates on some dynamic integral inequalities in three variables which can be used to study certain dynamic equations. We give some applications to convey the importance of our result. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

The effects of pressure and temperature on the exchange energy of a parabolic quantum dot under a magnetic field
Publication date: Available online 29 March 2017 Source:Journal of Taibah University for Science Author(s): Faten BZOUR, Ayham SHAER, Mohammad K. ELSAID The combined effects of pressure and temperature on the energy levels of a parabolic GaAs quantum dot under a magnetic field had been studied. The exact diagonalization method had been used to solve the two electron quantum dot Hamiltonian and to obtain the eigenenergies. In addition, we have investigated the effects of pressure and temperature on the singlet-triplet exchange energy ( J = E T − E s ) of the quantum dot as a function of a magnetic field. The magne...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

A numerical scheme for solutions of a class of nonlinear differential equations
Publication date: Available online 29 March 2017 Source:Journal of Taibah University for Science Author(s): Şuayip Yüzbaşi In this paper, a collocation method based on the Bessel functions of the first kind is presented to compute the approximate solutions of a class of high-order nonlinear differential equations under the initial and boundary conditions. Firstly, the matrix forms of the Bessel functions of the first kind and their derivatives are constructed. Secondly, by using these matrix forms, collocation points and the matrix operations, nonlinear differential equation problem is converted to a system of nonlin...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Solution of a system of delay differential equations of multi pantograph type
Publication date: Available online 30 March 2017 Source:Journal of Taibah University for Science Author(s): Sara Davaeifar, Jalil Rashidinia A collocation method is proposed to obtain an approximate solution of a system of multi pantograph type delay differential equations with variable coefficients subject to the initial conditions. The general approach is that, first of all the solution of the system has been expanded according to First Boubaker polynomials (FBPs) basis. Then, by employing the matrix operations and collocation nodes, the original problem and the associated initial conditions are reduced to a nonlinea...
Source: Journal of Taibah University for Science - April 19, 2017 Category: Science Source Type: research

Optoelectronic properties of four azobenzene-based iminopyridine ligands for photovoltaic application
Publication date: Available online 16 January 2017 Source:Journal of Taibah University for Science Author(s): Aziz El alamy, Abdelkrim El-Ghayoury, Amina Amine, Mohammed Bouachrine Because of organic π-conjugated materials’ optoelectronic properties and potential applications in a wide range of electronic and optoelectronic devices, such as organic solar cells, these materials, including both polymers and oligomers, have been widely studied in recent years. This work reposts a theoretical study using the DFT method on four azobenzene-based iminopyridines. The theoretical ground-state geometry, electronic structure...
Source: Journal of Taibah University for Science - March 11, 2017 Category: Science Source Type: research

Electrochemical and anticorrosion properties of 5-hydroxytryptophan on mild steel in a simulated well-acidizing fluid
Publication date: Available online 16 January 2017 Source:Journal of Taibah University for Science Author(s): Ekemini Ituen, Onyewuchi Akaranta, Abosede James The anticorrosion effect of 5-hydroxytryptophan (5-HTP) on mild steel (MS) was investigated by gravimetric and electrochemical techniques. Two different concentrations (1M and 15%) of hydrochloric acid were used to simulate well-acidizing fluid. The results show that 10×10−5 M 5-HTP is 96.1% efficient in 1M HCl and 78.1% efficient in 15% HCl at 30°C. The efficiency decreases as the temperature increases, reaching 66.9% and 39.8% in 1M and 15% HCl, respective...
Source: Journal of Taibah University for Science - March 6, 2017 Category: Science Source Type: research

Occupational Radiation Dose for Medical Workers at a University Hospital
Publication date: Available online 16 January 2017 Source:Journal of Taibah University for Science Author(s): M.H. Nassef, A.A. Kinsara Occupational radiation doses for medical workers from the departments of diagnostic radiology, nuclear medicine, and radiotherapy at the university hospital of King Abdul-Aziz University (KAU) were measured and analysed. A total of 100 medical radiation workers were monitored to determine the status of their average annual effective dose. The analysis and the calibration procedures of this study were carried out at the Center for Radiation Protection and Training-KAU. The monitored wor...
Source: Journal of Taibah University for Science - March 6, 2017 Category: Science Source Type: research

Soliton solution in nonlinear lattice with nearest neighbour Born –Mayer interaction
Publication date: March 2017 Source:Journal of Taibah University for Science, Volume 11, Issue 2 Author(s): Muzzammil Ahmad Bhat, Gautam Johri, N.K. Pandey We study the dynamics of one-dimensional uniform lattice with the interatomic Born–Mayer potential. The travelling wave solutions such as solitons are analytically described. The wave propagation in the one-dimensional lattice where nearest neighbour atoms interact via the Born–Mayer potential is considered. The Born–Mayer lattice admits travelling wave type solutions represented by Jacobian elliptic functions and limiting form of such a wave solution is the ...
Source: Journal of Taibah University for Science - March 2, 2017 Category: Science Source Type: research