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Existence theory and stability analysis to a system of boundary value problem
Publication date: Available online 1 July 2017 Source:Journal of Taibah University for Science Author(s): Kamal Shah, Cemil Tunc The aims and objectives of this manuscript are devoted to investigate some adequate results for the existence of solution to a nonlinear coupled system of fractional order differential equations(FDEs). Appropriate conditions for the existence of at least one solution are developed by using a fixed point theorem of Leray Schauder type to the considered problem. Further, we also investigate the Hyers-Ulam stability results for the proposed problem. Appropriate examples are given to demonstrate ...
Source: Journal of Taibah University for Science - July 2, 2017 Category: Science Source Type: research

High Performance Pd-Rh/YBaCo4O7/ γ-Al2O3 Three-way Catalysts for Gasoil Engine
Publication date: Available online 30 June 2017 Source:Journal of Taibah University for Science Author(s): Brou Albert Kouadio, Fuming Mei, Tao Li, Lei Pang The evaluation of catalytic activity for Rh-Pd/YBa (Co1-xMx) 4O7/γ-Al2O3 (M=Al, Ce, Zr, and La) showed that the efficiency of NOx reduction depends strongly on the nature of the OSMs. Among a series of oxygen storage materials, YBa (Co1-xMx) 4O7(M=Ce, Zr, La, Ga and In) studied for catalyst enhancement, only the catalyst with YBa (Co0.9Ce0.1)4O7 has better conversion efficiency respectively (85% of NO, 96% of CO and 92% of HC). After treatment at 1000°C for 3h,...
Source: Journal of Taibah University for Science - July 1, 2017 Category: Science Source Type: research

Lessons Learned from the Application of Management Effectiveness Evaluation in Sabah Al-Ahmad Natural Reserve: Implications for Conservation in Kuwait
Publication date: Available online 28 June 2017 Source:Journal of Taibah University for Science Author(s): Mouza Nassep, Amr El-Sammak, Rafat Misak The main objective of this research is to apply the Management Effectiveness Evaluation (MME) assessment for Sabah Al-Ahmad Natural Reserve in the State of Kuwait. During this research, scheduled program has been developed to visit the protected area, in order to identify the current situation. The analysis were done according to the methodology of IUCN. Management effectiveness reflects three main themes in protected area management, these themes are: 1. Design issues rel...
Source: Journal of Taibah University for Science - June 29, 2017 Category: Science Source Type: research

In vitro Antimicrobial and in vivo Lead Acetate Poison Abatement Study of Garcinia kola Heckel.
Publication date: Available online 28 June 2017 Source:Journal of Taibah University for Science Author(s): Omorefosa Osarenkhoe Osemwegie, Charles Obiora Nwonuma, Abimbola Peter Oluyori, Praise Ocheanya Abraham, Abraham Abayomi Akanbi, Deborah Oluyemisi Opaleke, Omokolade Oluwaseyi Alejolowo (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - June 29, 2017 Category: Science Source Type: research

Safety evaluation of green synthesized Cola nitida pod, seed and seed shell extracts-mediated silver nanoparticles (AgNPs) using Allium cepa assay
Publication date: Available online 27 June 2017 Source:Journal of Taibah University for Science Author(s): Taofeek A. Yekeen, Musibau A. Azeez, Akeem Akinboro, Agbaje Lateef, Tesleem B. Asafa, Iyabo C. Oladipo, Samuel O. Oladokun, Adewumi A. Ajibola The increase in the use of nanoparticles in various fields of human endeavours calls for the need to understand the toxic potential of the green synthesized nanoparticles. Cytogenotoxic potentials of green synthesized Cola pod (Cp-AgNPs), seed (Cs-AgNPs) and seed shell (Css-AgNPs) silver nanoparticles and silver nitrates salt (Ags) were evaluated using A. cepa assay. ...
Source: Journal of Taibah University for Science - June 28, 2017 Category: Science Source Type: research

Behaviour of thermoluminescence green and red emission bands of natural dolomite irradiated with gamma rays
Publication date: July 2017 Source:Journal of Taibah University for Science, Volume 11, Issue 4 Author(s): C. Soliman, S.M. Metwally, F.F. Alharbi, K.M. Elshokrofy The green and red emission bands of natural dolomite were analyzed by the thermoluminescence (TL) method to test the possibility of their use in different applications in radiation measurements in a range of doses between 1Gy and 104 Gy. The natural sample revealed two peaks at 240°C and 325°C in the green region and four peaks at 225°C, 240°C, 270°C and 325°C in the red region. The dose response curves are sublinear for both bands over the range 1�...
Source: Journal of Taibah University for Science - June 25, 2017 Category: Science Source Type: research

Boubaker polynomials collocation approach for solving systems of nonlinear Volterra-Fredholm integral equations
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): Sara Davaeifar, Jalil Rashidinia Numerical schemes have been developed for solutions of systems of nonlinear mixed Volterra-Fredholm integral equations of the second kind based on the First Boubaker polynomials (FBPs). The classical operational matrices are derived. The unknown has been approximated by FBPs and the Newton-Cotes points were applied as the collocations points. Error estimate and convergence analysis of the proposed method have been proved. Some numerical experiments are considered. The results are c...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

Preparation of nanocrystalline Cd doped PbS thin films and their structural and optical properties
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): S. Rajathia, K. Kirubavathi, Selvaraju K. The PbS and Cd doped PbS nanocrystalline thin films prepared by chemical bath deposition technique, deposited at 80°C onto glass substrates. The aqueous solution containing precursors of Cd2+ and Pb2+ has been used to obtain good quality film deposits at optimized preparative parameters. The characterization of the films were carried out using X-ray diffraction, optical absorption, photoluminescence properties, scanning electron microscopy and energy dispersive X-ray ana...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

QSPR study of the retention/release property of odorant molecules in pectin gels using statistical methods
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): Assia Belhassan, Samir Chtita, Tahar Lakhlifi, Mohammed Bouachrine ACD/ChemSketch, MarvinSketch, and ChemOffice programs were used to calculate several molecular descriptors of 51 odorant molecules (15 alcohols, 11 aldehydes, 9 ketones and 16 esters). The best descriptors were selected to establish the quantitative structure property relationship (QSPR) of the retention/release property of odorant molecules property in pectin gels using principal components analysis (PCA), multiple linear regression (MLR), multi...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

Role of Ag additives on light induced metastable defects in Se-In glassy system
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): Anjani Kumar, D. Kumar, S.K. Tripathi, R.K. Shukla, A. Kumar Present communication reports the role of Ag additives on light induced metastable defects in Se-In glassy alloys, well known thermally stimulated current (TSC) technique have been used for the present measurements. Amorphous thin films of Se90In10-xAgx (x=0, 2, 4, 8) have been prepared by well known thermal evaporation technique. Measurements have been made in given thin films prior and after exposing amorphous thin films to white light at different ...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

Microwave radiation improved biodiesel yields from waste cooking oil in presence of modified coal fly ash
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): Yulin Xiang, Yukun Xiang, Lipeng Wang This paper studied the effects of modified coal fly ash as catalyst on the waste cooking oil (WCO) conversion into biodiesel under microwave strengthened action. The coal fly ash was modified with sodium sulfate and sodium hydroxide. The obtained catalyst was characterized by FT-IR and X-ray diffraction (XRD). Experimental results showed that the modified coal fly ash catalyst could improve biodiesel yields under microwave assisting system, and the maximum biodiesel yield fro...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

Multicomponent synthesis, biological evaluation and molecular docking of new spiro-oxindole derivatives
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): M. Sapnakumari, B. Narayana, K.S. Shashidhara, B.K. Sarojini A new series of spiro-oxindoles which found to inhibit methionine tRNA synthase (PDB ID: 1PFV) and glucosamine-6-phosphate synthase (PDB ID: 1JXA) enzymes in virtual screening are synthesized by three-component 1,3-dipolar cycloaddition route. The reaction proceeds through the formation of azomethine ylides generated in situ by the decarboxylative condensation of isatin and amino acids with the dipolarophile chalcones. These compounds are found to be a...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

Rapid Degradation of Methyl Orange by Ag Doped Zeolite X in the Presence of Borohydride
Publication date: Available online 23 June 2017 Source:Journal of Taibah University for Science Author(s): A. Zainal Abidin, N.H.H. Abu Bakar, E.P. Ng, W.L. Tan A series of Ag nanoparticles impregnated on zeolite X (Ag-ZX), containing various amounts of Ag (in wt %), were prepared via impregnation method. The pristine zeolite X and Ag-ZX catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption desorption analyses and atomic absorption spectroscopy (AAS). The prepared catalysts were employed for the decolorization of methyl orange (MO) in the presence of po...
Source: Journal of Taibah University for Science - June 24, 2017 Category: Science Source Type: research

Analysis of toxic heavy metals in 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 analyse 10 cigarette brands sold in the Egyptian market. The 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 Puri...
Source: Journal of Taibah University for Science - June 11, 2017 Category: Science Source Type: research

Volumetric and optical properties of ACE inhibitor captopril in aqueous-alcoholic mixtures
This article addresses the accurate measurements of densities and refractive indices of solutions containing captopril in pure solvents such as water, methanol, ethanol and 1-propanol and aqueous mixtures of methanol, ethanol and propan-1-ol of 30%, 50% and 70% by volume in a wide range of drug concentration at 26°C. This article also includes the evaluation of apparent molar volume, partial molar volume at infinite dilution and transfer volumes. The concentration dependence of the refractive indices studied and respective fitting parameters have been reported. Different properties are interpreted in terms of intermolecul...
Source: Journal of Taibah University for Science - June 5, 2017 Category: Science Source Type: research