Lp-Theory for the Compressible Navier-Stokes Equations with Slip Boundary Conditions
- Salem Mubarak Alzahrani, Hela Louati, Mohamed Meslameni
- Reseived: 30 August 2018 Received in Revised Form: 3 November 2018 Accepted: 12 November 2018
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In this paper, we study the compressible Navier-Stokes equations with Navier boundary conditions. We prove that this problem admits at least one regular solution without any assumptions of smallness on the data. The present work gives a new method to solve the nonlinear problems in fluid mechanics based on fixed point theory results under weak topology setting.
Establishing a Sustainable Urban Design Strategies for Conservation and Rehabilitation Heritage Villages in Albaha
- Naief A. Aldossary
- Reseived: 16 July 2018 Received in Revised Form: 2 October 2018 Accepted: 9 October 2018
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This paper aims to establish design strategies for sustainable planning and design of heritage villages in the Kingdom of Saudi Arabia. The southern regions of Saudi Arabia have a cooler climate compared with other regions of Saudi Arabia, which gives it an advantage from the perspective of tourism. Moreover, the southern regions also have many heritage villages and historical facilities across the region that need to be developed, which requires the establishment of design strategies for rehabilitation of these sites. Developing and redesigning the current heritage villages in the southern regions requires specific design strategies that takes into account the local climate, availability of construction materials, and the local culture. In order to establish such design strategies, an expert consultation approach was employed as the primary methodology of this study. About 80 experts from different industries in Saudi Arabia and worldwide were invited to participate in the study to help establish strategies for developing social legacies. The paper highlights a number of different design strategies for: (a) urban planning, related to transportation and open spaces, and landscape design for heritage villages; (b) environmental design related to the form and fabric of historical buildings, use of natural resources and vernacular architecture; and (c) social participation and investment strategies. The design strategies suggested are applicable to both heritage culture in Saudi Arabia.
Task Allocation Approach for Virtual Sensors with Energy Use Considerations
- Nouf M. Alzahrani, Ahmed H. Alahmadi, Ahmed A. Alqarni
- Reseived: 11 March 2018 Received in Revised Form: 8 May 2018 Accepted: 16 May 2018
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Wireless Sensor Networks (WSNs) have limitations such as power usage, communication, processing power, and storage. At the same time, there are ongoing challenges in managing, storing, and processing data from massive networks. Sensor-based cloud infrastructure is a promising solution for these issues. In this case, the infrastructure provides a cloud computing platform by which multiple users share physical sensors; this overcomes many of the limitations of WSNs. Virtual sensors are interfaces between physical sensors and cloud computing platforms that share and run multiple applications on a physical sensor using cloud-based resources. This paper introduces a task allocation approach for virtual sensors in a sensor-cloud that optimizes energy use. CloudSim shows a significant drop in energy usage compared to existing approachs.
Improving the CF Algorithm Based on User Behavior to Complement the User-Item Rating Matrix
- Osama E. Sheta, Mohamed S. Adrees, Majzoob K. Omer, Hamza AlShawabkad, Elturabi Habib
- Reseived: 28 Mar 2018 Received in Revised Form: 13 May 2018 Accepted: 23 May 2018
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This paper presents a system of academic recommendation model by applying the algorithm Collaborative Filtering to the student's registration to Al-Baha University using the website for selecting most appropriate colleges to them according to their preferences and desires. Collaborative Filtering algorithm which will be implemented through Academic Recommender System present flexibility, reliability and academic recommendation that will help the student to take the best decision. This paper aims to provide high-quality recommendations when data are absent or insufficient by solving the problem of limited data by users when using CF, since previous user evaluation data are absent or insufficient, affecting the completion of User-Item Rating Matrix. We suggest a method to reduce the scarcity of data availability using the behavior of previous users. This method provides support for the electronic submission management of Albaha University to provide quality service contribute to facilitate the electronic submission and provide a service advice and guidance to the students which contributes to the performance of the functions rapidly and desired accuracy and to produce a new service to the Saudi universities for the first time.
Identification of Phytochemical Constituents in Petroleum Ether and Methanolic Extracts of Nicotiana glauca by GC-MS Analysis
- Sami A. Al-Robai
- Reseived: 21 February 2018 Received in Revised Form: 22 April 2018 Accepted: 29 April 2018
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This study was aimed to isolate and determine the possible phyto-components of different parts of the invasive Nicotiana glauca in Albaha region. Gas chromatography-mass spectrometry (GC-MS) analysis of the petroleum ether and methanol extracts of each plant part was performed. The analysis revealed that the extracts of N. glauca were very rich in various types of phyto-components with varying quantities. Hydrocarbons were the major constituents in leaves, stem bark, root bark and flower extracts. These findings suggested N. glauca as a target non-food crop for biofuel production. Other phyto-components such as phytol, squalene, tetracosane, alpha- tocopherol, sitosterol, hexadecanoic acid, pyridine and linalool were detected. The obtained results suggest the possible utilization of this widely invasive plant in Albaha area as a source of bioactive constituents that may have important therapeutic and industrial applications.
