Al Sohar, Oman
Al Sohar, Oman

Sohar University was established in 2001 as the first private university in Oman. It was granted degree awarding powers by the Oman Ministry of Higher Education, with the authority to provide programs and courses whose successful completion leads to academic awards. Wikipedia.

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Rajamohan N.,Sohar University
Desalination and Water Treatment | Year: 2017

Bio filtration of n-hexane and styrene mixture is always a difficult and challenging process due to the hydrophobicity and recalcitrant nature of the components. In this research study, a novel nano composite based adsorber was employed as the pre-treatment stage before biofilter to treat the VOC mixture. The hybrid reactor yielded better results compared to the stand alone biofilter. The concentration range employed in this study was 0.5–2.0 g m–3 for n-hexane and 0.25–1.0 g m–3 for styrene. Higher removal efficiencies were achieved at lower inlet concentrations at maximum EBRT of 90 s. Styrene removal efficiencies were found to be better than n-hexane removal efficiencies. The comparison between hybrid model and conventional biofilter proved the superior performance of the hybrid model. The carbon dioxide production was found to be proportional to the degradation rate represented in terms of elimination capacity. The correlation was proposed and actual yield coefficient was found to be lesser than the theoretical value. Biomass growth was studied across the height of the biofilter and found to be appreciable in the lower sections. © 2017 Desalination Publications. All rights reserved.

Ellobody E.,Sohar University
Advances in Structural Engineering | Year: 2017

This article discusses the non-linear analysis and design of highway composite bridges with profiled steel sheeting. A three-dimensional finite element model has been developed for the composite bridges, which accounted for the bridge geometries, material non-linearities of the bridge components, bridge boundary conditions, shear connection, interactions among bridge components and bridge bracing systems. The simply supported composite bridge has a span of 48 m, a width of 13 m and a depth of 2.3 m. The bridge components were designed following the European code for steel–concrete composite bridges. The live load acting on the bridge was load model 1, which represents the static and dynamic effects of vertical loading due to normal road traffic as specified in the European code. The finite element model of the composite bridge was developed depending on additional finite element models, developed by the author, and validated against tests reported in the literature on full-scale composite bridges and composite bridge components. The tests had different geometries, different boundary conditions, different loading conditions and different failure modes. Failure loads, load–mid-span deflection relationships, load–end slip relationships, failure modes, stress contours of the composite bridge as well as of the modelled tests were predicted from the finite element analysis and compared well against test results. The comparison with test results has shown that the finite element models can be effectively used to provide more accurate analyses and better understanding for the behaviour and design of composite bridges with profiled steel sheeting. A parametric study was conducted on the composite bridge highlighting the effects of the change in structural steel strength and concrete strength on the behaviour and design of the composite bridge. This study has shown that the design rules specified in the European code are accurate and conservative for the design of highway steel–concrete composite bridges. © 2016, © The Author(s) 2016.

Abdalgader K.,Sohar University
ACM International Conference Proceeding Series | Year: 2017

While a hard clustering algorithm lets a pattern to belong to a single cluster class, soft clustering allows patterns to belong to all cluster classes with different degrees of relationship. This is important in the case of short-text clustering, in which a small-sized text fragment such as a quotation or sentence may be related to more than one subject or topic. However, soft clustering of short-text is complicated by the computational difficulties inherent in defining cluster centroids using conventional cluster centrality measures. Therefore, this paper proposes a new soft short-text clustering algorithm based on the use of PageRank as a centrality measure. Results suggest that when used in hard clustering mode, its performance is on par with state-of-the-art spectral clustering algorithms. Advantages of the algorithm include its ability to perform soft clustering, its ability to operate on non-symmetric matrices, and its ability to converge automatically to an appropriate number of cluster classes. © 2017 ACM.

Kazem H.A.,Sohar University | Chaichan M.T.,University of Technology, Iraq
Renewable and Sustainable Energy Reviews | Year: 2012

Iraq suffers from electricity shortages, and many challenges will have to be overcome to meet future increases in electrical demands. This investigation found that solar, wind and biomass energy are not being utilized sufficiently at present, but these energies could play an important role in the future of Iraq's renewable energy. Additionally, the potential of offshore-wind energy in the Gulf (near Basrah in the southern part of Iraq) needs to be investigated. The Iraqi government's attempts to utilize renewable energy have been discussed. This paper aims to review and discuss the status and future of renewable energy in Iraq. The uses of renewable energy sources, such as solar, wind and biomass, have been reviewed. This paper concludes with recommendations for the utilization of these energy resources. © 2012 Elsevier Ltd.

Al-Mansoori M.H.,Sohar University | Mahdi M.A.,University Putra Malaysia
Optics Express | Year: 2011

We demonstrate a widely tunable L-band multiwavelength Brillouin-erbium fiber laser utilizing a nonlinear amplified fiber loop mirror filter (AFLMF). By manipulating polarization controllers placed in the fiber loop, the erbium peak gain spectrum is able to be shifted. The nonlinear AFLMF induces wavelength-dependent cavity loss and serves as an amplitude equalizer. In addition, it provides flexibility on controlling the amount of light reflected and transmitted into and out of the laser's cavity. By utilizing 100 mW 1480 nm pump and 1.1 mW Brillouin pump power, an average of 24 stable output channels are generated by the proposed structure that could all be tuned over the whole L-band window from 1570 nm to 1610 nm. © 2011 Optical Society of America.

Kazem H.A.,Sohar University | Khatib T.,Sohar University | Sopian K.,National University of Malaysia
Energy and Buildings | Year: 2013

This paper presents a method for optimal sizing of a standalone PV system for remote areas in Sohar, Oman. PV array tilt angle as well as the size of the system's energy sources are designed optimally for better performance and lower energy cost. Numerical methods for optimization of the PV module tilt angle, PV array size and storage battery capacity are implemented using MATLAB and hourly meteorological data and load demand. The results show that for Sohar zone the tilt angle of a PV array must be adjusted twice a year. The PV array must be slanted at 49° in the period of 21/09-21/03 (n = 255-81), while it must be horizontal (tilt angle is zero) in the period of 21/03-21/09 (n = 81-255). This adjustment practice gains the energy collected by a PV array by 20.6%. As for the PV system size, the results show that the sizing ration of the PV array for Oman is 1.33 while the sizing ratio for battery is 1.6. However the cost of the energy generated by the proposed system is 0.196 USD/kWh. © 2013 Elsevier B.V.

Nawahda A.,Sohar University
Environmental Monitoring and Assessment | Year: 2015

Ground level ozone (O3) concentrations were measured across Sohar highway in Oman during a four-month period from September to December 2014 by using an open-path deferential optical absorption spectroscopy (DOAS) instrument. The monthly average concentrations of O3 varied from 19.6 to 29.4 ppb. The measurements of O3 are compared with the measurements of a non-open-path UV photometry analyzer (UVP). The percent difference (PD) concept and linear regression methods were used to compare the readings of the two instruments. The findings show high correlation coefficients between the measurements of the DOAS and UVP instruments. The DOAS measurements of O3 are found to be less than those measured by the UVP instrument; the correlation coefficients between absolute PD values and meteorological parameters and PM2.5 were very low indicating a minor effect; therefore, titrations of O3 by traffic emissions and difference in elevation could be the reason for the difference in the measurements of the two instruments. © 2015, Springer International Publishing Switzerland.

Amin N.,Sohar University
Water, Air, and Soil Pollution | Year: 2014

In Japan, all 47 prefectures conduct routine air quality monitoring at 1,145 stations throughout the country to assess the effects on the environment. The current study aims to provide a better understanding of possible estimations of crop yield loss caused by exposure to monitored concentrations of surface ozone in Japan during the key ozone-season months from April to December 2005. The effect of surface ozone on the irrigated rice crop in Japan is evaluated based on the AOT40 index (accumulated exposure over threshold of 40 ppb) during 3-month periods of the growing season. Assuming no changes in land use and field management practices during the period from 2000 to 2005, we find that the estimated average relative yields of the irrigated rice crop is 91 % caused by exposures to monitored surface ozone concentrations. These losses in the relative yield of the irrigated rice crop in Japan in 2005 could cost around 280.4 million (int. /). © Springer Science+Business Media Dordrecht 2013.

Saravanan N.,Sohar University | Ramachandran K.I.,Sohar University
Expert Systems with Applications | Year: 2010

An efficient predictive plan is needed for any industry because it can optimize the resources management and improve the economy plant, by reducing unnecessary costs and increasing the level of safety. A great percentage of breakdowns in the productive processes are caused for gear box, they began its deterioration from early stages, also called incipient level. The extracted features from the DWT are used as inputs in a neural network for classification purposes. The results show that the developed method can reliably diagnose different conditions of the gear box. The wavelet transform is used to represent all possible types of transients in vibration signals generated by faults in a gear box. It is shown that the transform provides a powerful tool for condition monitoring and fault diagnosis. The vibration signal of a spur bevel gear box in different conditions is used to demonstrate the application of various wavelets in feature extraction. In this paper fault diagnostics of spur bevel gear box is treated as a pattern classification problem. The major steps in pattern classification are feature extraction, and classification. This paper investigates the use of discrete wavelets for feature extraction and artificial neural network for classification. © 2009 Elsevier Ltd. All rights reserved.

Kazem H.A.,Sohar University
Renewable and Sustainable Energy Reviews | Year: 2011

This paper attempts to review and discuss the status and future prospects of renewable energy in Oman. Renewable energy sources like solar, wind, hydro, geothermal, and biomass have been revised. The electricity shortages and the challenges to overcome the increase in electrical demands for the near future have been discussed. The investigations found that solar, shore-wind and geothermal could play an important role in the future of renewable energy in country. Also, it is found that there is need to investigate the potential of offshore-wind, biomass, and hydro (tide, wave and ocean thermal energy). The appearance and weight of renewable energy in the higher education programs and the Oman commitment toward renewable energy have been discussed. The paper finishes with some conclusions and recommendations. © 2011 Elsevier Ltd. All rights reserved.

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