Tabuk, Saudi Arabia

Fahad Bin Sultan University
Tabuk, Saudi Arabia
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Abbas A.,University of Balamand | Nasri A.,Fahad Bin Sultan University
Computer-Aided Design and Applications | Year: 2017

As originally conceived, T-splines generalize both NURBS and Subdivision surfaces. Central to T-splines is the knot refinement algorithm, which seems to successfully import the local characteristic of B-spline and NURBS curve knot insertion. However, the mathematical decisiveness manifested in curve knot insertion is nowhere to be seen in previously published versions of T-spline local refinement. In this respect, this paper gives a tutorial exposition of T-spline local refinement, interpreted in the spirit of a belief-revision metaphor. It also provides a detailed implementation of that, designed following the architecture of rule-based systems. Both of these are classical topics in traditional Artificial Intelligence Research. © 2017 CAD Solutions, LLC

Abu-Samha M.,Fahad Bin Sultan University | Madsen L.B.,University of Aarhus
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2016

We present theoretical photoelectron momentum distributions (PMDs) for ionization from Ar(3p) and H2+(σg) orbitals by few-cycle, high-intensity, near-infrared laser fields circularly polarized in the xy plane. The three-dimensional time-dependent Schrödinger equation is solved numerically within the single-active-electron approximation for Ar and within the fixed nuclei approximation for H2+. The PMDs are investigated for alignment of the probed target orbitals relative to the polarization plane of the laser field. In the atomic case, the PMDs in the polarization plane for aligned 3p Ar orbitals are, up to an overall scaling factor, insensitive to alignment of the probed orbital, while the lateral PMDs show a signature of the orbital node when that node is sufficiently close to the polarization plane. For the molecular case of H2+(σg), our results show a significant impact of alignment on the PMDs due to the anisotropic molecular potential and the alignment-dependent coupling between the ground state and excited states. © 2016 American Physical Society.

Bayoud H.A.,Fahad Bin Sultan University | Awad A.M.,University of Jordan
Journal of Bioequivalence and Bioavailability | Year: 2011

In this paper the problem of interest is the bioequivalence metrics and their role in assessing the rate and extent of absorption ratios of two drug formulations. Several bioequivalence metrics were proposed by several authors in the literature to estimate the similarity or dissimilarity of two drug formulations. The existing bioequivalence metrics are reviewed. A new bioequivalence metric is proposed and motivated. The performance, in terms of the statistical power, of the previously proposed and the new bioequivalence metrics is also evaluated by simulating cross-over bioequivalence trials © 2011 Bayoud HA, et al.

Akhtar M.N.,Fahad Bin Sultan University | Hattamleh O.,Hashemite University | Akhtar J.N.,Polytechnic University of Mozambique
MATEC Web of Conferences | Year: 2017

The aim of present study is to investigate about the potential use of coal fly ash along with other natural and solid wastes for the production of coal fly ash based bricks and roof tiles. The study is based on the comprehensive reviews available from the previous experimental data on coal fly ash based bricks and roof tiles. The study intendeds to provide the essential technical information and data for the use of fly ash mix with other solid wastes and reveal their suitability as construction materials. It has been found that samples were non-hazardous in nature and vigorously used as an additional construction materials and their compositions are perfectly fit to make the strong composite material for bricks and tiles. The three past studies have been demonstrated that, fly ash based bricks and roof tiles provides a sustainable supplement to the traditional clay bricks and roof tiles, that not only increases the efficiency of traditional bricks and roof tiles but also helps significantly to reduce the environmental issues associated with the disposal of these waste materials. In addition to this study highlights the potential use of fly ash for producing sustainable construction materials. © The Authors, published by EDP Sciences, 2017.

Husein Malkawi A.I.,Fahad Bin Sultan University | Shatnawi E.,CH2MVA | Husein Malkawi D.A.,University of Akron
MATEC Web of Conferences | Year: 2017

This paper addresses the feasibility and the efficiency of using Natural Pozzolan and/or Rock flour in Roller Compacted Concrete (RCC) gravity dams. For this purpose, five identical mortar trial mixes were prepared using five different supplementary materials, i.e., fly ash produced in South Africa (proven to be effective in RCC construction), fly ash produced in Turkey, Jordanian natural pozzolan, Saudi natural pozzolan, and rock flour from Mujib Dam basalt quarry. The physical and chemical properties of these pozzolanic materials were determined. The effectiveness of each one of these mineral admixtures used as a cement replacement material in controlling alkali silica reaction are studied and analyzed. Correlations were made between the mechanical properties for the five proposed mixes and a control mix using the Jordanian Portland Cement. The results demonstrate that the performance of Natural Pozzolana and/or rock flour as compared with that of fly ash and other pozzolanic material is very satisfactory and can be effectively used in RCC construction. © The Authors, published by EDP Sciences, 2017.

Al Hattamleh O.,Hashemite University | Akhtar M.N.,Fahad Bin Sultan University
MATEC Web of Conferences | Year: 2017

This paper presents the results on the influence of pore fluid salinity on the Collapsibility of low plastic clay from Hashemite town, Jordan. Double odometer tests were carried out on natural specimens using pore fluids with different salt concentrations. The results indicate a considerable amount of collapse takes place for the sample with increasing the initial applied pressure on the sample regardless of the initial molding water content. However, the dry side of optimum sample shows larger collapse than that on wet side of optimum sample and vice versa. At low applied initial stresses, the higher the salts percentage in the sample, the larger the collapse occurs. Moreover, the amount of collapse tends to increase with increasing the applied pressure to reach a certain value for a given salts percentage, then the amount of collapse asymptotes to its maximum value or level off with increasing the pressure on the sample. © The Authors, published by EDP Sciences, 2017.

Al-Degs Y.S.,Hashemite University | Al-Ghouti M.,Fahad Bin Sultan University | Walker G.,Queen's University of Belfast
Journal of Thermal Analysis and Calorimetry | Year: 2012

Higher heating value (HHV) is probably the most important property of the fuels. Bomb calorimeter and derived empirical formulae are often used for accurate determination of HHV of fuels. A useful empirical equation was derived to estimate HHV of petro-diesels from their C and H contents: HHV (in MJ/kg) = 0.3482(C) + 1.1887(H), r2 = 0.9956. The derived correlation was validated against the most common formulae in the literature, Boie and Channiwala-Parikh correlations. Accordingly, accurate determination of C and H contents is essential for estimation of HHV and avoids using a bomb calorimeter. However, accurate estimation of C and H contents requires using expensive and laborious gas chromatographic techniques. In this work, chemometry offered a simple method for HHV determination of petro-diesels without using bomb calorimeter or even gas chromatography. PLS-1 calibration was used instead of gas chromatography to find C and H contents from the non-selective mid-infrared (MIR) spectra of petro-diesels, HHV was then estimated from the earlier empirical equation. The proposed method predicts HHV of petro-diesels with high accuracy and precision, with modest analysis costs. The present method may be extended to other fuels. © Akademiai Kiado, Budapest, Hungary 2011.

Kayed A.,Fahad Bin Sultan University | El-Qawasmeh E.,King Saud University | Qawaqneh Z.,Jordan University of Science and Technology
Information and Management | Year: 2010

Many web search engines retrieve enormous amounts of irrelevant information in answer to users' queries. The semantic web provides a promising approach to improve search operation. For specific domains, ontologies can capture concepts to help machines deal with data semantically. Our aim in writing this paper was to show how to measure the closeness (relevancy) of retrieved web sites to user query-concepts and re-rank them accordingly. We therefore proposed a new relevancy measure to re-rank retrieved documents. We termed the approach "ontology concepts" and it on the domain of electronic commerce. Results suggested that we could re-rank the retrieved documents (web sites) according to their relevancy to the search query. Our method depends on the frequency of the "ontology concepts" in the retrieved documents and uses this to compute their relevancy. © 2010 Elsevier B.V. All righs reserved.

Gourtsoyannis E.,Fahad Bin Sultan University
Advances in Space Research | Year: 2010

The ancient Greek astronomical calculator known as the Antikythera Mechanism has been analyzed using geometrical, calculus, trigonometric and complex variable methods. This analysis demonstrates that the Mechanism modeled the variations in the Moon's angular velocity as seen from the Earth, to better than 1 part in 200. A major implication of this analysis is that the Antikythera Mechanism of the 2nd century BCE modeled the anomalistic motion of the Moon more accurately than Ptolemy's account of Hipparchus's theory of the 2nd century CE. In the present work, mathematics, astronomy, history and methodology of the sciences combine in the study of a unique artifact, preserved for posterity in an ancient ship that sank in the Mediterranean 2100 years ago and recovered by Greek sponge divers at the dawn of the 20th century. © 2010 COSPAR. Published by Elsevier Ltd.

Bayoud H.A.,Fahad Bin Sultan University
Lecture Notes in Electrical Engineering | Year: 2013

The parameters of the two-parameter exponential distribution are estimated in this chapter from the Bayesian viewpoint based on complete, Type-I and Type-II censored samples. Bayes point estimates and credible intervals of the unknown parameters are proposed under the assumption of suitable priors on the unknown parameters and under the assumption of the squared error loss function. Illustrative example is provided to motivate the proposed Bayes point estimates and the credible intervals. Various Monte Carlo simulations are also performed to compare the performances of the classical and Bayes estimates. © 2013 Springer Science+Business Media Dordrecht.

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