University of Hafr Al Batin
University of Hafr Al Batin
Apalara T.A.,University of Hafr Al Batin
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2017
In this work, we consider a system of laminated beams with structural damping which describes the slip occurring at the interface of two-layered objects. The system is coupled to a heat equation modeling an expectedly dissipative effect through heat conduction governed by Cattaneo’s law. The well-posedness as well as the uniform stability results of the system is established. © 2017, Springer International Publishing.
Marzougui H.,Tunis el Manar University |
Marzougui H.,University of Hafr Al Batin
Canadian Journal of Physics | Year: 2016
In the present work, we propose a modification to the standard K-ϵ model for simulating homogeneous decaying turbulence subjected to uniform rotation. In this modification, the dissipation rate equation is formulated in terms of the rotation rate ω, the integral length scales along the axis of rotation L∥, and its isotropic value L0. The comparison of our results with the corresponding direct numerical simulations proves that the new model reproduces in an excellent way the decay rate of the turbulent kinetic energy. © 2016 Published by NRC Research Press.
Sharmin A.,University of Malaya |
Alengaram U.J.,University of Malaya |
Jumaat M.Z.,University of Malaya |
Yusuf M.O.,University of Hafr Al Batin |
And 2 more authors.
Construction and Building Materials | Year: 2017
This research article reports the contribution of different oxides present in rice husk ash (RHA), ground granulated blast furnace slag (GGBS) and metakaolin (MK) on the performance of geopolymer mortars. Twenty-six mixes were designed with combined base materials and varied NaOHaq concentration, that was used as one of the activators. RHA, GGBS and MK contents were varied between 15% and 70%, 0% and 75%, and 0% and 40%, respectively. The binder/fine aggregate, water/binder and alkaline activator/binder ratios were kept constant while all the specimens were cured at 65 °C for 24 h. The mixture (ternary) that contained 25% RHA, 25% MK and 50% GGBS (M25R25G50) produced the highest compressive strength of 48 MPa; in addition, it produced better flow rate and lower density than any binary combinations. The findings through microstructural and characterization tools show that regardless of the source, SiO2 and CaO present in the base materials contributed to the strength, while Al2O3 influenced the amorphorsity of the products. © 2017 Elsevier Ltd
Abo-Monasar A.,King Fahd University of Petroleum and Minerals |
Al-Zahrani M.,University of Hafr Al Batin
Water Science and Technology: Water Supply | Year: 2017
Delivering water in sufficient quantity and acceptable quality is the main objective of water distribution networks (WDN) and at the same time is the main challenge. Many factors affect the delivery of water through distribution networks. Some of these factors are relevant to water quality, quantity and the condition of the infrastructure itself. The deterioration of water quality in the WDN leads to failure at the water quality level, which can be critical because it is closest to the point of delivery and there are virtually no safety barriers before consumption. Accordingly, developing a powerful monitoring system that takes into consideration water demand distribution, the vulnerability of the distribution system and the sensitivity of the population to the deterioration of water quality can be very beneficial and, more importantly, could save lives if there was any deterioration of water quality due to operational failure or cross-contamination events. In this paper, a framework for a water quality monitoring system that considers water demand distribution, the vulnerability of the system and the sensitivity of the population using fuzzy synthetic evaluation and optimization algorithms is developed. The proposed approach has been applied to develop a monitoring system for a real WDN in Saudi Arabia.
Zeyad A.M.,Jazan University |
Megat Johari M.A.,Universiti Sains Malaysia |
Tayeh B.A.,Islamic University of Gaza |
Yusuf M.O.,University of Hafr Al Batin
Construction and Building Materials | Year: 2016
The primary focus of this work was to utilize the waste of palm oil industry as a supplementary binder for producing high strength concrete (HSC) whose strength reached 116 MPa. The treatment of ground POFA (GPOFA) to produce ultrafine or treated POFA (UPOFA) changed its fineness, unburned carbon composition and percentage of pozzolanic minerals (SiO2 + Al2O3 + Fe2O3) and led to the production of high strength concrete dubbed HSCg and HSCu, respectively. The characteristics of HSCu indicated UPOFA positive contributions towards workability, strength and permeability (gas and water, chloride penetration and migrations). At the age of 180 days, HSCu containing 20, 40 and 60% of UPOFA resulted in the compressive strength of 108.6, 114.4 and 112.4 MPa, respectively as against the maximum of 106.5 MPa and 105.1 MPa in HSCg and POFA-free high strength concrete (HSC-OPC), respectively. HSCu samples also have the best fluid transport properties when compared to HSCg and HSC-OPC. © 2016 Elsevier Ltd
Al-Zahrani M.A.,King Fahd University of Petroleum and Minerals |
Abo-Monasar A.,University of Hafr Al Batin
Water Resources Management | Year: 2015
Water demand prediction is essential in any short or long-term management plans. For short-term prediction of water demand, climatic factors play an important role since they have direct influence on water consumption. In this paper, prediction of future daily water demand for Al-Khobar city in the Kingdom of Saudi Arabia is investigated. For this purpose, the combined technique of Artificial Neural Networks (ANNs) and time series models was constructed based on the available daily water consumption and climatic data. The paper covers the following: forecast daily water demand for Al-Khobar city, compare the performance of the ANNs [General Regression Neural Network (GRNN) model] technique to time series models in predicting water consumption, and study the ability of the combined technique (GRNN and time series) to forecast water consumption compared to the time series technique alone. Results indicate that combining time series models with ANNs model will give better prediction compared to the use of ANNs or time series models alone. © 2015 Springer Science+Business Media Dordrecht
Al-Zahrani M.,King Fahd University of Petroleum and Minerals |
Abo-Monasar A.,University of Hafr Al Batin |
Sadiq R.,University of British Columbia
Journal of Water Supply: Research and Technology - AQUA | Year: 2016
The prioritization of water mains for renewal requires the consideration of their impact on the deterioration of water quality, in addition to their structural integrity and hydraulic capacity. The deterioration of water mains may lead to structural failure that may have grave economic impacts. This paper develops a fuzzy-based decision support system (DSS) to identify the vulnerable locations in water distribution network (WDN) that may cause overall system failure not only to compromise structural integrity, but also include failures related to water quality and hydraulic capacity. The developed DSS was applied to Al-Khobar WDN located in the eastern part of the Kingdom of Saudi Arabia. To achieve the objectives of the study, an aggregate vulnerability index representing the likelihood of system failure was developed using multi-criteria decision models. In addition, the potential impacts in terms of sensitivity index were also evaluated using advanced soft computing methods. Finally, a risk index, based on both vulnerability and sensitivity indices, was developed to help water managers to prioritize the water mains based on the overall risk of failure. © IWA Publishing 2016 Journal of Water Supply: Research and Technology-AQUA | 65.2 | 2016.
Bouzid B.,University of Hafr Al Batin |
Abu Khadra F.,University of Hafr Al Batin
Microwave and Optical Technology Letters | Year: 2016
A novel design of high and broad gain that covers C and L bands is demonstrated experimentally. The techniques, used in this paper, combine two double pass with split band structure. The signals travel in separate paths after being splitted using a coupler band splitter. The topology of this new configuration uses this technique to broaden the gain at its maximum range of amplification. The presented paper is to study the performance of the augmented gain of the EDFA configuration using what it can be called double pass wide band amplification. The results show a broadening range of 80 nm between 1520 nm and 1600 nm in the C and L band and high gain of 45 dB for the range 1525 nm and 1580 nm and lower gain for the range 1580 nm and 1600 nm. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2093–2096, 2016. © 2016 Wiley Periodicals, Inc.
Apalara T.A.,University of Hafr Al Batin
Acta Mathematica Scientia | Year: 2016
In this paper we consider one-dimensional Timoshenko system with linear frictional damping and a distributed delay acting on the displacement equation. Under suitable assumptions on the weight of the delay and the wave speeds, we establish the well-posedness of the system and show that the dissipation through the frictional damping is strong enough to uniformly stabilize the system even in the presence of delay. © 2016 Wuhan Institute of Physics and Mathematics.
Faiz M.M.U.,University of Hafr Al Batin |
Al-Mutairi M.S.,University of Hafr Al Batin
Proceedings of 2015 International Conference on Interactive Collaborative Learning, ICL 2015 | Year: 2015
In this paper, we have compared the achievements of educational institutions in Saudi Arabia in terms of ABET accredited programs and world university rankings. In other words, a brief survey of all ABET accredited programs at the associate, bachelor's, and master's degree level in Saudi universities and colleges is presented. Moreover, we have also compared the global rankings of Saudi universities over the last 6 years from 2009 to 2014, according to some of the most widely recognized international university ranking systems. Finally, we hope that our paper will be helpful in motivating educational institutions in the Arab world to continue to improve their performance in terms of accreditation and rankings both regionally and globally. © 2015 IEEE.