2,791 research outputs found
Geophysical characterisation of asphalt pavement failure: a case study from the campus of South Valley University, Qena, Egypt
No full textNear-surface seismic refraction tomography and electrical resistivity imaging were used to study the collapse and subsidence of two asphalt roads on the campus of South Valley University in southern Egypt. The roads surround a garden where irrigation water was suspected to be the cause of the damage to the asphalt roads. Two seismic refraction tomography (SRT) lines were measured on the asphalt roads, and a single SRT line and an electric resistivity tomography (ERT) line were measured within the garden. The tomographic inversion of the SRT lines on the road shows several low velocity anomalies indicating areas of weakness beneath the asphalt. The SRT and ERT lines in the garden show a thin surface soil of fine sand and clay overlying a low electric resistivity and low seismic velocity clay layer. Examination of the results suggests that the damage to the asphalt roads could be caused by the presence of loose silt and clay soil that was used as a sub-base for the asphalt. This soil had not been compacted and engineered for use as a strong base layer. Instead, the asphalt was laid directly on top of it, which later led to the failure of the roads
Hierarchical Representations of Freebase Topics
No full textThe dataset contains more than 21M hierarchical relationships about ≈10M topics extracted from Freebase knowledgebase. The topics span the various categories of Freebase including Science & Technology, Arts & Entertainment, Sports, Society, Products & Services, Transportation, Time & Space, Special Interests, and Commons. The relationships describe the hierarchies of topics in terms of Types, Domains, and Categories. For example, ‘Albert Einstein’ can be found as a topic that is a sub-class of ‘Person’, belonging to the ‘People’ domain and ‘Society’ category. Another entity named as ‘Albert Einstein’ can also be found as a sub-class of ‘Book’, belonging to the ‘Books’ domain and ‘Arts & Entertainment’ category. The dataset is published in JSON and CSV formats, sample files are provided to help explore how the dataset is structured. The dataset is believed to be useful for studying the inter-related connections among topics in different domains of knowledge. The first author may be contacted at ([email protected]) for more information. The following paper may kindly be cited in case of using the dataset. Mahmoud Elbattah, Mohamed Roushdy, Mostafa Aref, Abdel-Badeeh M. Salem. “Large-Scale Entity Clustering Using Graph-Based Structural Similarity within Knowledge Graphs”, Big Data Analytics: Tools, Technology for Effective Planning, CRC Press. https://www.researchgate.net/publication/321716589_Large-Scale_Entity_Clustering_Based_on_Structural_Similarity_within_Knowledge_Graph
Hierarchical Representations of Freebase Topics
No full textThe dataset contains more than 21M hierarchical relationships about ≈10M topics extracted from Freebase knowledgebase. The topics span the various categories of Freebase including Science & Technology, Arts & Entertainment, Sports, Society, Products & Services, Transportation, Time & Space, Special Interests, and Commons. The relationships describe the hierarchies of topics in terms of Types, Domains, and Categories. For example, ‘Albert Einstein’ can be found as a topic that is a sub-class of ‘Person’, belonging to the ‘People’ domain and ‘Society’ category. Another entity named as ‘Albert Einstein’ can also be found as a sub-class of ‘Book’, belonging to the ‘Books’ domain and ‘Arts & Entertainment’ category. The dataset is published in JSON and CSV formats, sample files are provided to help explore how the dataset is structured. The dataset is believed to be useful for studying the inter-related connections among topics in different domains of knowledge. The first author may be contacted at ([email protected]) for more information. The following paper may kindly be cited in case of using the dataset. Mahmoud Elbattah, Mohamed Roushdy, Mostafa Aref, Abdel-Badeeh M. Salem. “Large-Scale Entity Clustering Using Graph-Based Structural Similarity within Knowledge Graphs”, Big Data Analytics: Tools, Technology for Effective Planning, CRC Press. https://www.researchgate.net/publication/321716589_Large-Scale_Entity_Clustering_Based_on_Structural_Similarity_within_Knowledge_Graph
The Optimization of Modified Composite Nano-materials as a Novel Approach to Dental Hygiene Remediation
No full textA Master of Science thesis in Chemical Engineering by Marah Mazen Mahmoud entitled, “The Optimization of Modified Composite Nano-materials as a Novel Approach to Dental Hygiene Remediation”, submitted in December 2019. Thesis advisor is Dr. Taleb Ibrahim and thesis co-advisor is Dr. Sarah Dalibalta. Soft copy is available (Thesis, Approval Signatures, Completion Certificate, and AUS Archives Consent Form).Oral diseases have always been a challenge to contend with in the modern world, especially with the adoption of unhealthy lifestyles. These habits have contributed to the growth of S. mutans, P. gingivalis, and H. pylori, among other oral bacteria that encourage the development of dental caries, periodontal diseases, and cancer. To battle these diseases, conventional methods such as toothpastes and mouthwashes have been used and unconventional methods such as carbon compounds and nanoparticles have been developed. The complexation of cationic surfactants and smectite clays has been explored and an example of such an organoclay is the one made of cetylpyridinium chloride (CPC) and montmorillonite (Mt). In this study, the aforementioned organoclay was prepared and optimized with respect to CPC uptake by varying the contact time between 1 hour and 3 days, varying the CPC concentration between 5.11 × 10&'M and 4.52 × 10&*M, and varying the temperature between 25°C and 55°C. The experiments showed that shaking the complex was a better approach to intercalation than using the magnetic stirring plate, and that a 24-hour contact period at a moderate concentration of 1.44 × 10&*M at 25°C provided the highest level of intercalation and relatively low levels of desorption. Additionally, UV radiation had no effect on the intercalation extent of CPC with montmorillonite. The prepared solids were then tested on saliva samples plated in nutrient agar. These experiments showed that the prepared complex retained its antibacterial behavior through a likely combination of adsorption and lysis.College of EngineeringDepartment of Chemical EngineeringMaster of Science in Chemical Engineering (MSChE
sj-docx-1-whe-10.1177_17455057231171486 – Supplemental material for Perceived facilitators and barriers to the provision of sexual and reproductive health services in response to the Syrian refugee crisis in Lebanon
No full textSupplemental material, sj-docx-1-whe-10.1177_17455057231171486 for Perceived facilitators and barriers to the provision of sexual and reproductive health services in response to the Syrian refugee crisis in Lebanon by Fouad M Fouad, Mahmoud Hashoush, Jasmin Lilian Diab, Dana Nabulsi, Sarah Bahr, Sarah Ibrahim, Theresa Farhat and Loulou Kobeissi in Women's Health</p
GTL Diesel Way Forward to Improve Properties by Separating Light Ends and Formulating the Specifications
No full textGas-To-Liquid (GTL) Diesel fuel produced from synthetic crudes obtained from natural gas that is converted by the Fisher Tropsch (FT) technology is a promising key player for the mobility industry future along with conventional diesel fuels. The main distinctive properties that distinguish between GTL Diesel and conventional Diesel fuels include density, viscosity, lubricity and Cetane Index. The aim of this study was to identify the effect of the change in GTL Diesel���s composition and boiling range on its market specifications, then to develop predictive models for the GTL Diesel properties based on the fuel���s composition. The study recommends how the industry can use these data for upgrading the fuel quality based on distribution market demand. Intensive testing to analyze many characteristics for GTL Diesel was done at Texas A&M University at Qatar (TAMUQ), and ORYX GTL Company provided the GTL Diesel samples. The study was divided into two sections; the first section consisted of the experimental and modeling work where multiple GTL Diesel cuts were initially prepared. The properties of the prepared cuts were analyzed for five critical GTL Diesel fuel market specifications: Density, Viscosity (kinematic and dynamic), Flash point, Cetane index and Cold properties (Pour and Cloud points). In the second section, these properties were compared with the original market specifications in order to identify whether an improvement in fuel characteristics is obtained. In the third section, the properties of these fuel cuts are used to generate mathematical models for properties-compositions relationships. Finally, we proposed certain modifications to the existing GTL Plants that will improve the separation of specific quality of fuels and value-added chemicals cut. This study also identified the potentials for the light cuts obtained from GTL Diesel fuel to be used for the production of Linear Alkyl Benzene (LAB), which is considered as an expensive value-chemical and a feedstock to detergents manufacturing plants
Structural adjustment in Egypt : the case of agriculture
No full textThis thesis assesses the appropriateness and effectiveness of the economic reform and structural adjustment programme adopted by Egypt in 1991. It also examines the main political and economic constraints of such policies. It argues that it is unlikely to provide sustainable or equitable growth. It also argues that privatisation
programmes in Egypt have a limited effect on improving levels of investment and growth. It stresses the need to encourage new investment to increase the productive
capacity of the Egyptian economy in order to generate sustainable growth. The thesis examines in particular, economic reforms in the agricultural sector. It focuses
on assessing price reforms so as to enquire how evenly distributed the benefits have been among farmers with different sizes of land holding. Those with big farms are
likely to gain more while very small farmers and the landless are likely to lose. Within agriculture the thesis assesses the impact of structural adjustment on Egypt's
agribusiness community. This sector is economically fragmented, has limited effectiveness and is politically weak regarding its participation and its influence on
economic policy. The thesis argues that the success Df this sector is based on the availability of a strong and effective state to provide the legal and regulatory.
infrastructure needed for an effective market economy, to abolish administrative obstacles and to enhance investors' credibility. In short, the thesis maintains that sustaining the economic reform is based on reviving productive investments and enhancing state capacity and democratisation
Optimal design and energy management of an isolated fully renewable energy system integrating batteries and supercapacitors
No full textThe continuous rise of global electricity demand and significant dependency on fossil fuel-based centralised power plants are the main indicators of increasing greenhouse gas emissions, thus negatively affecting climate change and human health and increasing the earth temperatures. This alarming situation has demanded the transition to 100 % renewable energy to decarbonise energy use. However, the fluctuating weather resources, and high investment cost are the major challenges with renewable energy implementation. In this context, the combined integration of multiple sources with energy storage in a so-called hybrid renewable energy system was developed as a durable remedy for the previous issues. This paper proposes a joint and conceptual approach for techno-economic design and dynamic rule-based power control of an off-grid solar/wind hybrid renewable energy system integrated with a hybrid energy storage system that comprises a lithium-ion battery, lead-acid battery, and a supercapacitor. Such concurrent integration of 100 % renewable energy systems and hybrid energy storage systems is lacking in the existing literature. First, with the aid of HOMER software, the feasibility and optimisation analysis of nine different configurations was performed in 1 min resolution to find the optimal component sizes. Second, MATLAB/Simulink models were assembled for the winning design based on a dynamic rule-based strategy to investigate and analyse the system’s dynamic response, power equilibrium, DC-bus voltage supervision and load voltage/frequency control against instantaneous and dynamic changes in the load or renewable energy resources. The proposed approach was promoted and validated on an actual case study for isolated residential community electrification in Saudi Arabia, in which a multi-tier framework was adopted to accurately simulate the stochastic energy consumption of the community’s households. From the design results, the hybrid renewable energy system, which integrates solar, wind, lead-acid batteries, and converter with optimal capacities of 55 kW, 18 kW, 325 kWh and 42 kW converter, respectively, is the most cost-effective alternative with the minimum net present and energy costs of 0.3458/kWh, respectively. The system has the least unmet load with 13.5 kWh/years (0.02 %), thus ensuring maximum reliability and customer satisfaction. Meanwhile, the developed control strategy efficiently improved the dynamic response, the DC-bus voltage stability, and the load voltage/frequency during different climatological and load interruptions. Further, the use of lead-acid batteries and supercapacitors has effectively diminished the maximum overshoot of the DC-bus and load voltages by 50 % during all disturbances. In addition, the integration of supercapacitors proficiently saved 2.3–6 kW during wind speed change and 2–9 kW during simultaneous changes in the radiation and load. Overall, the presented method, together with the reported results, provides an improved understanding and highlights the extent to which the successful integration of hybrid renewable energy system and hybrid energy storage system can be used to develop reliable and sustainable energy access for off-grid areas
Arabian Studies in honour of Mahmoud Ghul : Symposium at Yarmouk University, December 8-11, 1984, Editor in chief : Moawiyah M. Ibrahim. On Commission with Otto Harrassowitz, Wiesbaden (Yarmouk University Publications, Institute of Archaelogy and Anthropology Series, vol. 2), 1989. 21,5x30 cm, 177 p. (en langues européennes) + 160 p. (en langue arabe), 1 portrait en début de volume. Titre arabe : Dirsāt ' arabiyya fi dikrā Mahmūd al-Gūl
No full textRobin Christian-Julien. Arabian Studies in honour of Mahmoud Ghul : Symposium at Yarmouk University, December 8-11, 1984, Editor in chief : Moawiyah M. Ibrahim. On Commission with Otto Harrassowitz, Wiesbaden (Yarmouk University Publications, Institute of Archaelogy and Anthropology Series, vol. 2), 1989. 21,5x30 cm, 177 p. (en langues européennes) + 160 p. (en langue arabe), 1 portrait en début de volume. Titre arabe : Dirsāt ' arabiyya fi dikrā Mahmūd al-Gūl. In: Bulletin critique des annales islamologiques, n°8, 1992. pp. 192-194
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