Engineering Commons^™

Studies On Stable Crack Growth, Mohammed Juma Humaid Al-Ghafri

Theses

The goal of this work is to experimentally investigate the stable crack growth (SCG) fracture behavior of AISI 4340 alloy steel. A series of mode I and mixed mode SCG fracture tests were carried out on 8 mm thick compact tension (CT) specimens subjected to quasistatic loading. The wire cutting technique was used to introduce a pre-notch/ pre-crack of 0.05 mm root radius to the specimen. Five different loading angles Ψ between the loading axis and the crack surface were employed; 90° (mode I), 75°, 65°, 60° and 50°. Five different ratios of original crack length to specimen width a …

Experimental Study Of Low Salinity Water Flooding And Fracturing Effects In Low Permeability Carbonate Reservoir, Benny Arianto Harahap

Theses

In past decades, there were numerous research works demonstrated that salinity alteration of injected water could enhance the oil recovery. Low salinity water (LSW) injection is a type of Enhanced Oil Recovery (EOR) method, which attracts the industrial, and researchers because of its simplicity to use the implications,

Environment-friendly nature, and less cost. In addition to, hydraulic fracturing, also known as hydraulic stimulation, is another EOR method that improves hydrocarbon flow by creating fractures in the Low Permeability Formation (LPF) that connects the reservoir and wellbore. Fractures will increase the permeability of reservoir and give the flow path for hydrocarbon …

Oil Recovery By Surfactant Flooding; Sensitivity Analysis To Technical Parameters And Economic Analysis, Hadel Mohsen Moustafa

Theses

Various enhanced oil recovery methods including miscible gas injection, chemical, thermal and other methods are applied at the third phase of production after the primary and secondary recovery have been exhausted. Surfactant flooding is one of the chemical methods that is capable of recovering more oil by decreasing the IFT and/or wettability alteration.This piece of work aims to asses and select the development options using surfactant process that maximize oil recovery for a synthetic reservoir model by optimizing technical and economic analysis.

Reservoir simulation study using ECLIPSE 100 was used to study the different development options of surfactant flooding applied …

Durability Of Glass Fiber-Reinforced Polymer Bars In Seawater-Contaminated Concrete, Abdelrahman A. E. Alsallamin

Theses

This research aims to investigate the durability performance and microstructure characteristics of two different types of glass fiber-reinforced polymer (GFRP) bars in severe environment. GFRP bars encased in seawater-contaminated concrete were immersed in tap water for 5, 10, and 15 months at temperatures of 20, 40, and 60°C. Half of the specimens were conditioned under a sustained load of 25% of their ultimate strength whereas the other half was conditioned without load. Following conditioning, the GFRP bars were retrieved then tested to failure under uniaxial tension. Microstructure analysis was performed by employing differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) …

Evaluation Of Electrocoagulation For Chloride And Ammonium Removal From The Reject Brine Effluent Pretreated By Solvay Process, Miada Abubaker Ali

Theses

Excessive use of desalination, due to the increase in freshwater demand, results in large productions of reject brine. Therefore, the development of an efficient treatment process of the reject brine becomes vital. The Solvay process is one of the main treatment technologies, wherein NH₃ is introduced to convert soluble Na⁺ into insoluble NaHCO₃. However, in this process, Cl^- is not removed and NH₄⁺ is introduced, and therefore electrocoagulation has been proposed for their removal. The experiment was designed using Minitab with different initial concentrations of chloride (7400 – 32600 mg/l), current densities (0.033 …

Urban Park Design, Level Of Enclosure And People’S Satisfaction: A Comparative Analysis Of Al Jahili And Al Selimi Parks In Al Ain, Uae, Amnah Ali S Gargoum

Theses

The purpose of this research is to understand how physical characteristics of parks with a particular focus on different levels of enclosure affect park usage level and user patterns in the city of Al-Ain, UAE. Parks in Al Ain are present in different parts of the city and provide plenty of opportunities for leisure and recreation. Despite this diversity, parks located within the inner city area remain the most popular among the residents of Al-Ain, and have expanded significantly in the last few years. Specifically, this thesis aims to understand how the levels of usage and the behavioral patterns of …

An Immersive Learning Model, Shamsa Abdulla Salem Al Mazrouei

Theses

Our overarching goal is to provide children with immersive game-based learning environments to support Arabic linguistic skills acquisition. We postulate that immersion in- creases learning. To investigate this hypothesis, we developed a model and built an implementation of an educational virtual environment (EVE) that supports immersion and thus, induces effective learning. Experimental results confirm our hypothesis.

Our model integrates learning content, learning activities, immersion and gameplay. Based on our analysis of various curricula, specifically the United Arab Emirates grade one curriculum, we identified the nature of the learning content in order to satisfy the curriculum requirements. This content is conceptually …

Enabling Smart City Services For Heterogeneous Wireless Networks, Besintha Jafar Marakkarakath

Theses

A city can be transformed into a smart city if there is a resource-rich and reliable communication infrastructure available. A smart city in effect improves the quality of life of citizens by providing the means to convert the existing solutions to smart ones. Thus, there is a need for finding a suitable network structure that is capable of providing sufficient capacity and satisfactory quality-of-service in terms of latency and reliability. In this thesis, we propose a wireless network structure for smart cities. Our proposed network provides two wireless interfaces for each smart city node. One is supposed to connect to …

Performance Study For Capillary Machine-To-Machine Networks, Maisaa Othman Albaghdadi

Theses

Communication technologies witness a wide and rapid pervasiveness of wireless machine-to-machine (M2M) communications. It is emerging to apply for data transfer among devices without human intervention. Capillary M2M networks represent a candidate for providing reliable M2M connectivity. In this thesis, we propose a wireless network architecture that aims at supporting a wide range of M2M applications (either real-time or non-real-time) with an acceptable QoS level. The architecture uses capillary gateways to reduce the number of devices communicating directly with a cellular network such as LTE. Moreover, the proposed architecture reduces the traffic load on the cellular network by providing capillary …

Wave Energy Assessment In Southern Central Java Island And Control Method For Maximizing The Captured Power In Wave Energy Converters, Fatima Sultan Ghdayer Ali Alaryani

Theses

This thesis discusses the wave energy potential of the Indian Ocean on the south coast of Central Java Island, where no previous known similar study has been conducted. A control technique that involves a dynamic electrical model was established. The following objectives were achieved. The first was to determine the ideal location to implement wave energy conversion (WEC), and the second objective was to simulate the significant wave height by using the novel control method.

To achieve these goals, the following steps and procedures were implemented. Wave energy assessment was conducted for the Indian Ocean on the south coast of …