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An active-set trust-region algorithm for solving warehouse location problem
Publication date: Available online 25 May 2016 Source:Journal of Taibah University for Science Author(s): B. El-Sobky, Y. Abo-Elnaga, L. Al-Naser In this paper, an active-set strategy is used together with a penalty method and a trust-region technique to solve a warehouses location problem. The trust region is used to modify the local method in such a way that it is guaranteed to converge at all even if the starting point is far away from the solution. The trust-region method is a well-accepted technique in nonlinear optimization to assure global convergence and is more robust when they deal with rounding errors....
Source: Journal of Taibah University for Science - May 25, 2016 Category: Science Source Type: research

Qualitative properties of certain non-linear differential systems of second order
Publication date: Available online 24 May 2016 Source:Journal of Taibah University for Science Author(s): Cemil Tunç, Yavuz Dinç In this paper, we study the boundedness and square integrability of solutions in certain non-linear systems of differential equations of second order. We establish two new theorems, which include suitable sufficient conditions guaranteeing the boundedness and square integrability of solutions to the considered systems. The presented proofs simplify previous works since the Gronwall inequality is avoided which is the usual case. The technique of proof involves the integral test, and two ...
Source: Journal of Taibah University for Science - May 24, 2016 Category: Science Source Type: research

Weighting order and disorder on complexity measures
Publication date: Available online 21 May 2016 Source:Journal of Taibah University for Science Author(s): José Roberto C. Piqueira The initial ideas regarding measuring complexity appeared in computer science, with the concept of computational algorithms. As a consequence, the equivalence between algorithm complexity and informational entropy was shown. Attempting to connect these abstract formalisms to natural phenomena, described by Thermodynamics, the maximum disorder of a system would correspond to maximum complexity, a fact incoherent with the intuitive ideas of natural complexity. Considering that natural comp...
Source: Journal of Taibah University for Science - May 21, 2016 Category: Science Source Type: research

Water Body Extraction and Change Detection Using Time Series: A Case Study From Lake Burdur, Turkey
In this study spatiotemporal change of Lake Burdur in the period 1987–2011 was evaluated using the multi-temporal Landsat TM and ETM+ images. Support Vector Machine (SVM) classification and spectral water indexing including Normalized Difference Water Index (NDWI), Modified NDWI (MNDWI), and Automated Water Extraction Index (AWEI) were used for the extraction of surface water from image data. The spectral and spatial performance of each classifier was compared each other using the Pearson's r, the Structural Similarity Index (SSIM) and the Root Mean Square Error (RMSE). The accuracy SVM and satellite-derived indexes were...
Source: Journal of Taibah University for Science - May 13, 2016 Category: Science Source Type: research

Modeling cytotoxic activity of some pyrazolo-triazole hybrids using descriptors calculated from open source tool “PaDEL-descriptor”
In this study we developed QSAR models for anti-proliferative activity of the pyrazolo-triazole hybrids [(1-benzyl-1H-1,2,3-triazol-4-yl)(1,3-diphenyl-1H-pyrazol-4-yl) methanone] on human brain cancer (U87MG), lung cancer (A549), prostate cancer (PC-3), and colon cancer (HT-29) cell lines. We employed the K-means cluster analysis to split the data sets. Statistically robust models were generated [ pIC 50 (U87MG): R =0.873, Q 2 =0.554, R 2 pred =0.866; pIC 50 (A549): R =0.879, Q 2 =0.637, R 2 pred =0.858; pIC 50 (PC3): R =0.953; Q 2 =0.850; R 2 pred =0.796; pIC 50 (HT-29): R =0.962, ...
Source: Journal of Taibah University for Science - May 13, 2016 Category: Science Source Type: research

Simultaneous Analysis of Aliskiren and Hydrochlorothiazide in their Combined Dosage Form and Spiked Human Plasma by HPTLC
Publication date: Available online 13 May 2016 Source:Journal of Taibah University for Science Author(s): Jui J. Pandya, Nejal M. Bhatt, Vijay D. Chavada, Primal Sharma, Mallika Sanyal, Pranav S. Shrivastav A simple, selective and precise method based on HPTLC has been developed for the simultaneous determination of aliskiren and hydrochlorothiazide in a fixed dose tablet formulation and human plasma. The chromatography was performed on silica gel 60 GF254 plates, with a mobile phase consisting of methanol-chloroform (6:4, v/v). Densitometric analysis of the analytes was carried out at 225nm. Under the opti...
Source: Journal of Taibah University for Science - May 13, 2016 Category: Science Source Type: research

Determination of trace amounts of Brown HT as a food dye by CPE-Scanometry method
In this study, trace amounts of Brown HT was extracted, preconcentrated and determined by cloud point extraction-scanometry (CPE-Scanometry) as a simple, fast and inexpensive method. The procedure is based on CPE of Brown HT from aqueous solution, diluting the extracted surfactant-rich phase with ethanol to 500μL, transfering of proper volume of it to Plexiglas® cell and scanning of cells. Then the color of each cell was analyzed by the software written in visual basic (VB 6) media to red, green and blue values. Effective parameters on the extraction efficiency such as pH of the system, the concentration of the surfactan...
Source: Journal of Taibah University for Science - May 13, 2016 Category: Science Source Type: research

Thermal, structural and spectroscopic properties of Pr3+ ion doped in lead-zinc borate glasses modified by alkali metal ions
Publication date: Available online 13 May 2016 Source:Journal of Taibah University for Science Author(s): M.V. Sasi kumar, B Rajeswara Reddy, S. Babu, A. Balakrishna, Y.C. Ratnakaram This paper offers a study on the Pr3+ doped alkali and mixed alkali borate glasses prepared by melt quenching technique and characterized by thermal, structural and spectroscopic studies. The amorphous nature of the glasses system identified based on X-ray diffraction spectra. Using differential scanning calorimetry (DSC), the thermal behavior of borate glass carried out. The presence of function groups which are contain in the g...
Source: Journal of Taibah University for Science - May 12, 2016 Category: Science Source Type: research

Complexity of Some Families of Cycle Related Graphs
Publication date: Available online 4 May 2016 Source:Journal of Taibah University for Science Author(s): S.N. Daoud, K. Mohamed In this paper we derive new formulas for the number of spanning trees of a specific family of graphs such as: Gear graphs, Flower graph, Sun graph and Sphere graph, using techniques from linear algebra, Chebyshev polynomials and matrix theory. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - May 5, 2016 Category: Science Source Type: research

Mixed alkali effect in the physical and optical properties of xK2O-(25-x)Na2O-12.5MgO-12.5BaO-50B2O3 glasses
Publication date: May 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 3 Author(s): G. Srinivas, B. Ramesh, J. Siva Kumar, Md. Shareefuddin, M.N. Chary, R. Sayanna Borate glasses with the composition xK2O-(25-x)Na2O-12.5MgO-12.5BaO-50B2O3 (x =0, 5, 10, 15, 20 and 25mol%) were prepared by the melt-quenching technique and were characterized using X-ray diffraction at room temperature. From the optical absorption spectra, the direct forbidden, direct allowed, indirect allowed, and indirect forbidden energy gaps; Urbach energy; refractive index (n); dielectric constant (ɛ); reflection los...
Source: Journal of Taibah University for Science - May 4, 2016 Category: Science Source Type: research

Evidence of intermediate phase in AsxSe100−x chalcogenide glasses using isoconversional analysis of glass transition
Publication date: May 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 3 Author(s): Abdalla A. Elabbar The compositional and temperature dependence of the glass transition in As x Se100−x chalcogenide glasses were studied using differential scanning calorimetry (DSC). The temperature dependence of the glass transition activation energy was determined using an isoconversional kinetic analysis. The compositional trend of the activation energy provides evidence of a transition from floppy to rigid network regimes separated by an intermediate phase. The variations of the activation energy with re...
Source: Journal of Taibah University for Science - May 4, 2016 Category: Science Source Type: research

Synthesis, structural characterization and thermoluminescence glow curve study of gadolinium-doped Y2O3 nanophosphor
Publication date: May 2016 Source:Journal of Taibah University for Science, Volume 10, Issue 3 Author(s): Raunak Kumar Tamrakar, Vikas Dubey Gadolinium-doped Y2O3 nanophosphor was synthesized by a solid-state reaction method, which could be used for large-scale production of phosphors. The structure of the phosphor sample was characterized by powder X-ray diffraction, field emission gun scanning electron microscopy and high-resolution transmission electron microscopy. The particle size was calculated from Scherer's formula. X-ray diffraction showed a grain size of 35–55nm, in good agreement with the scanning elec...
Source: Journal of Taibah University for Science - May 4, 2016 Category: Science Source Type: research

Construction cost prediction model for conventional and sustainable college buildings in North America
Publication date: Available online 4 March 2016 Source:Journal of Taibah University for Science Author(s): Othman Subhi Alshamrani The literature lacks in initial cost prediction models for college buildings, especially comparing costs of sustainable and conventional buildings. A multi-regression model was developed for conceptual initial cost estimation of conventional and sustainable college buildings in North America. RS Means was used to estimate the national average of construction costs for 2014, which was subsequently utilized to develop the model. The model could predict the initial cost per square feet with ...
Source: Journal of Taibah University for Science - April 30, 2016 Category: Science Source Type: research

Synthesis of azo-linked diindolyl methanes using Fe3+-montmorillonite K10 under solvent-free condition
Publication date: Available online 11 March 2016 Source:Journal of Taibah University for Science Author(s): Mohammad Nikpassand, Leila Zare Fekri, Mohammad Rezapour Mousavi Efficient nucleophilic addition reactions of indole derivatives with various azo-linked aldehydes were carried out using Fe3+-montmorillonite K10 under solvent-free conditions to afford the corresponding diindolylmethanes in short reaction times and excellent yields. (Source: Journal of Taibah University for Science)
Source: Journal of Taibah University for Science - April 30, 2016 Category: Science Source Type: research

In vitro study of the antibacterial and anticancer activities of silver nanoparticles synthesized from Penicillium brevicompactum (MTCC-1999)
Publication date: Available online 15 March 2016 Source:Journal of Taibah University for Science Author(s): Shahnaz Majeed, Mohd Shafyiq bin Abdullah, Anima Nanda, Mohammed Tahir Ansari Among the most promising nanomaterials, metallic nanoparticles with antibacterial and antitumor properties are expected to open new avenues to fight and prevent various tumours and infectious diseases. The study of bactericidal nanomaterial is particularly timely considering the recent increase in new resistant strains of bacteria to the most potent antibiotics and the potential role of bactericidal nanomaterial as anticancer ag...
Source: Journal of Taibah University for Science - April 30, 2016 Category: Science Source Type: research