Digital Commons Network^™

Interactive Emirate Sign Language E-Dictionary Based On Deep Learning Recognition Models, Ahmed Abdelhadi Abdelhadi

Theses

According to the ministry of community development database in the United Arab Emirates (UAE) about 3065 people with disabilities are hearing disabled (Emirates News Agency - Ministry of Community Development). Hearing-impaired people find it difficult to communicate with the rest of society. They usually need Sign Language (SL) interpreters but as the number of hearing-impaired individuals grows the number of Sign Language interpreters can almost be non-existent. In addition, specialized schools lack a unified Sign Language (SL) dictionary, which can be linked to the Arabic language being of a diglossia nature, hence many dialects of the language co-exist. Moreover, there …

A Parametric Numerical Analysis Investigation To Optimize The Performance Of The Ranque-Hilsch Vortex Tube, Muneer Ahmad Sungur

Theses

A vortex tube is a device that separates compressed air into two streams: one with a higher temperature (hot stream) and the other with a lower temperature (cold stream). It is a popular cooling option because it is small, safe, and affordable. The main objective of this thesis is to examine the energy separation performance of RHVT by varying the internal tapering angles of convergent angles (2°, 1.75°, 1.5°, 1.25°, 1°, 0.75°, and 0.5°), straight angles (0°), and divergent angles (0.5°, 1°, 2°, 4°, and 6°), While the cold mass fraction is constant (0.317). Length-to-diameter ratio (Lt/Dt), inlet pressure, and …

Valuation Of Asian Options In A High Volatility Market With Jumps, Zeeshan Khalid

Theses

The evaluation of financial derivatives represents a central part of financial risk management. There are many types of derivatives among other path-dependent options. In this study, we aim at valuing Asian options. They are path dependent and have several benefits. For instance, their values are habitually lower than European options. Also, an Asian option on a commodity drops the risk value close to maturity. Though, the disadvantage is that they are in general difficult to value since the distribution of the payoff is usually unknown. It is agreed in the literature that a stochastic process with a jumps model for …

A Novel Approach For Detection Fault In The Aircraft Exterior Body Using Image Processing, Noura Nayef Almansoori

Theses

The primary objective of this thesis is to develop innovative techniques for the inspection and maintenance of aircraft structures. We aim to streamline the entire process by utilizing images to detect potential defects in the aircraft body and comparing them to properly functioning images of the aircraft. This enables us to determine whether a specific section of the aircraft is faulty or not. We achieve this by employing image processing to train a model capable of identifying faulty images. The image processing methodology we use involves the use of images of both defective and operational parts of the aircraft's exterior. …

Cheating Detection In Online Exams Based On Captured Video Using Deep Learning, Aysha Sultan Alkalbani

Theses

Today, e-learning has become a reality and a global trend imposed and accelerated by the COVID-19 pandemic. However, there are many risks and challenges related to the credibility of online exams which are of widespread concern to educational institutions around the world. Online exam system continues to gain popularity, particularly during the pandemic, due to the rapid expansion of digitalization and globalization. To protect the integrity of the examination and provide objective and fair results, cheating detection and prevention in examination systems is a must. Therefore, the main objective of this thesis is to develop an effective way of detection …

Assessing The Impact Of Alfalfa (Medicago Sativa) Crop On Groundwater Resources In The Emirate Of Abu Dhabi Using Geospatial Techniques, Abdulaziz Abdulla Aljaberi

Theses

Groundwater is a major source of fresh water in the world, especially in arid and semi-arid countries like the United Arab Emirates (UAE), where rainfall is not evenly distributed through the four seasons of the year. Therefore, it is necessary to pay serious attention to the importance of preserving groundwater resources. The agriculture sector poses a real threat to groundwater. Irrigated crop cultivation practices change groundwater levels as a result of cultivating crops or farming plants that consume large amounts of water. Alfalfa is an example of a high-water consuming crop, being a widely cultivated crop in the UAE. This …

The Reproducing Kernel Method For Solving Integro-Differential And Volterra Integral Equations, Khulood Gamal Qaid

Theses

Integro-differential equations are a class of mathematical equations that involve both derivatives and integrals. They have applications in a wide range of fields, including physics, engineering, finance, and biology such as the spread of diseases, population dynamics, and the behavior of financial markets. The study of these equations requires advanced mathematical techniques, including functional analysis, approximation methods, and numerical analysis. They are a rich area of research with many open questions and challenges.
In this thesis, we will develop and implement the reproducing kernel method to solve a class of integro-differential and Volterra integral equations. We discuss both cases when …

A Comparative Study On Microchip Implants In Humans And Wearable Devices, Ltifa Mohammed Almansoori

Theses

After the tragic covid pandemic in 2020, many things changed in the world, from learning physically all the way to e-learning, as the whole world was forced to switch digitally. It is expected that a lot of people will be more willing to invest in new technologies that aid in human development and among them are human microchip implants. The emerging technology of human microchip implants is slowly catching the attention of various countries around the world after the sudden surge of adoption in Europe. With the introduction of Biohax microchip implants in the UAE by Etisalat it is most …

The Impact Of Implementing A Gamified Application On Teaching And Learning Vocabulary In A Fourth Grade English Classroom In The Uae, Amani Mohammed Almostafa

Theses

This thesis is concerned with the impact of using digital games or gamification on learning vocabulary for English language fourth graders in a classroom in the UAE. The main objective of this thesis is to examine how the use of digital games may affect the process of learning vocabulary in a grade four classroom. Another purpose of this study is to investigate learners' and teachers' perceptions of learning vocabulary items. A Quasi-experimental mixed method design has been implemented in this study. Three Grade four classes experimented with independently engaging in gamified vocabulary software named Blooket. The three classes were each …

Biohydrogen Production Of A Co-Culture Consisting Of Halophytic Cyanobacterium Phormidium Keutzingianum And Activated Sludge Bacteria Using Different Exogenous Carbon Substrates And Salt Concentrations, Maitha Mohammed Al Nuaimi

Theses

Various studies have proved the ability of different types of cyanobacteria and algae to produce hydrogen (H₂) by splitting water molecules into H₂ and oxygen (O₂) using specialized enzymes (hydrogenase and nitrogenase enzymes) through the biophotolysis process. However, the production of O₂ acts as the main process inhibitor. Several researchers studied this O₂ sensitivity and proposed effective solutions to regulate O₂ concentration. By co-culturing algae with aerobic bacteria, the consumption of the resulting oxygen could be attained and thus reducing the sensitivity of the enzyme to the evolved O₂. In …

A Microscopic Investigation Of Chemically Modified Membranes For Potential Oil Water Separation Applications, Latifa Rashed Al Nuaimi

Theses

Oil spills can have catastrophic impacts on both the environment and human society, an enormous oil spill known as the Deepwater Horizon Disaster happened in the Gulf of Mexico in April 2010 caused by an explosion of oil rig which started the catastrophe. It is achievable to reduce oil spills by developing and advancing technologies including gravity settling, centrifugation, gas flotation, coagulation, electrochemical, adsorption, and membrane filtration. There are many materials that can be used to form membranes, and each one has unique properties and advantages. The current study used the 3D printing porous membrane which is manufactured with an …

Heat Transfer Analysis Of Microchannels Heat Sink With Sidewall Fins, Ahmad Ala Eddin Rahhal

Theses

This study aims to investigate Microchannel Heat Sinks with side wall fins through a model-based approach. The primary objective of the project is to design and analyze the thermal performance of straight Microchannel Heat Sinks with square and triangle-shaped fins on sidewalls. To examine their performance, a computational fluid dynamics (CFD) simulation study is conducted using the ANSYS Fluent software. The study starts by creating a CAD model of the heat sink and then analyzing its thermal properties with the ANSYS Fluent software. From the CFD simulation study, numerical results are obtained for different operational and geometrical conditions. The study …

Content Analysis Of Activities Of The Emirati Science Textbooks For The Fifth Grade In Light Of Science Process Skills, Teba Abdulazeez Al-Faiadh

Theses

Similar to several other countries, the United Arab Emirates places a high value on the use of science textbooks in the process of teaching and learning science. Therefore, the content of science textbooks must always be evaluated and analyzed in light of scientific knowledge and skills. Providing science process skills in the activities of science textbooks is essential and has a significant role in pushing students toward balanced scientific knowledge because attention to skills is a tool that enables the student to succeed in understanding the nature of science. However, based on the literature, there is a scarcity of scientific …

The Association Between College Instructors’ Trait Emotional Intelligence And Instructorstudent Relationship In A Uae Higher Education Institution, Salwa Habib Husain

Dissertations

The relationship between instructors and students in higher education institutions (HEIs) is a contributing factor to the students’ motivation to learn, emotional development and stability, and academic performance. The instructor’s trait Emotional Intelligence (EI) has been a focus in developing such positive relationships inside and outside the classroom setting. The extent to which instructors’ trait EI can contribute to a supportive and developmental relationship with students has not received due attention in research in the UAE. Therefore, the purpose of this study was to explore the association between instructors’ trait EI and the Instructor-Student Relationship at one HEI in the …

Capturing Maximum Photovoltaic Power With Machine Learning: Maximum Current Prediction, Mppt Methodology, And Adjustable Ml-Based Controller, Zahi Mohamed Mohamed

Dissertations

The primary aim of this doctoral thesis is to examine the potential application of machine learning (ML) in optimizing Maximum Power Point Tracking (MPPT) and devising a flexible ML-based controller for photovoltaic (PV) systems. The lack of MPPT mechanisms leads to fixed voltage and current points for PV modules, resulting in substantial power loss when environmental conditions vary. The limitations of conventional and enhanced MPPT methods, as well as finding an alternative controller to classical Proportional-Integral (PI) controllers, have spurred the search for substitute approaches to maximize PV power. To address these limitations, this thesis proposes using ensemble ML techniques, …

Impact Of Teaching Mathematics With Four Teaching Strategies On Fifth Grade Students’ Learning Of Fractions Addition And Subtraction, Nabil Riziq Al Farra

Dissertations

There are different tools, resources, and materials that mathematics teachers may use to enhance the teaching and learning processes under many types of teaching strategies such as technology (e.g., videos and virtual manipulatives), real objects (e.g., concrete manipulatives), and other teaching strategies are traditional (e.g., lectures). Some of the most important things that a teacher has to consider is the students’ learning needs and how to reach to their minds by different teaching strategies with a variety of resources and assess which are more effective in students’ learning anddevelopment in mathematics.

The purpose of this study is to investigate the …

Nano-Supported Biocatalysts For Efficient Wastewater Remediation, Khadega Abobaker Al-Maqdi

Dissertations

The existence of various bioactive organic pollutants in wastewater and municipal water sources has raised concerns regarding their potential effects on human health. As a result, different techniques are being explored to effectively break down these persistent organic pollutants. Peroxidases have recently emerged as a new approach to remediation that may have advantages over traditional methods. However, evaluating the effectiveness of different peroxidases in breaking down various emerging pollutants can be time-consuming and difficult. In this study, a quick and reliable method was developed to test the degradability of 21 emerging pollutants by five different peroxidases (soybean peroxidase, chloroperoxidase, lactoperoxidase, …

Improving The Thermal Performance And Energy Efficiency Of Buildings By Incorporating Biomass Waste Into Clay Bricks, Mohamed E. Elattar

Architectural Engineering

No abstract provided.

Lax Integrability And Solution Methods For The Nonlinear Schrödinger Equation With External Potentials: Exact Solutions And Applications, Laila Yahya Al Sakkaf

Dissertations

The investigation of a nonlinear differential equation (NLDE) integrability is the foundation for understanding and predicting the behavior of systems that are governed by that NLDE. The existence of a Lax pair (LP) representation is a reliable indicator of the indicator of the integrability of an NLDE. If an NLDE admits an LP, it is considered integrable in the LP sense, and this has important implications for the behavior and solutions of the system. The LP plays a crucial role in many powerful analytical solution methods for solving NLDEs. One such method is the Darboux transformation (DT), which allows for …

Development Of A Metal Droplet Generator For Studying Impact Dynamics, Xitong Xu

McKelvey School of Engineering Graduate Student Theses & Dissertations

Metal droplet-based 3D printing is a popular technique used for creating complex structures and multi-material components. However, accuracy is a significant challenge in this process due to complex thermal and dynamic behaviors that can negatively affect the final workpiece. To improve accuracy, the interactions between droplet impact dynamics and the deposition process of the droplets must be understood and ultimately controlled. In this thesis, I describe the optimization and implementation of an experimental setup for generating droplets of tin and for studying their impact dynamics. In particular, this thesis explains how an existing preliminary droplet generator was modified to produce …

Exploring The Development Of An Agribusiness Ecosystem For Singapore: Lessons From Taiwan, Kuo-Chang Fu

Dissertations and Theses Collection (Open Access)

The COVID-19 pandemic and complex global circumstances have prompted a heightened level of apprehension about food security in Singapore. With a land area of slightly over 700 square kilometers, of which a mere 1% is dedicated to agricultural purposes, Singapore's overall level of food self-sufficiency is less than 10%. Historically, Singapore has relied on imports to address its food deficits. However, due to the pandemic's impact and geopolitical tensions, which have resulted in instability within the global supply chain, Singapore is now compelled to re-evaluate its approach to food security. Consequently, there has been a substantial focus on exploring strategies …

Apparatus-Dependent Corrections To The Electron G-2 Revisited, Ulrich D. Jentschura

Physics Faculty Research & Creative Works

We revisit the derivation of the apparatus-dependent correction to the energy levels of quantum cyclotron states, as previously outlined [Boulware et al., Phys. Rev. D 32, 729 (1985)PRVDAQ0556-282110.1103/PhysRevD.32.729]. We evaluate the leading corrections to the axial, magnetron, cyclotron, and spin-projection-dependent energy levels due to the altered photon field quantization in the vicinity of a conducting wall. Our work significantly extends previous considerations. Quantum cyclotron states are used for the determination of the electron g factor in Penning traps. Our calculations show that the numerically largest apparatus-dependent corrections can be expected for the axial and magnetron frequencies, where they can be …

Design Of A Mini Leo Gnss Constellation And A Custom Gnss Signal Simulator Development, Mohamed Mohamed Yaser

Theses

This thesis is concerned with Low Earth Orbit (LEO) Global Navigation Satellite Systems (GNSS) constellations and signals, and how can they provide rapid Positioning, Navigation, and Timing (PNT) services for the emerging technologies. The first objective of this thesis is to perform a simulation of a new mini-LEO GNSS constellation at 1000 km and assess its performance in different scenarios. The second objective is to design a signal simulator for two signals that are propriety of the Global Navigation Satellite Augmentation Systems (GNSSaS), which are the BOC(2,2) and ATLBOC(7.5, BOC(2,2)) modulation schemes. To simulate the mini-LEO GNSS constellation, two software …

Data-Driven Modeling Of Student Performance In The Time Of Distance Learning, Iman Saad Megdadi

Theses

One of the important aspects that all academic institutions work towards improving is Student Performance. It is obviously the primary indicator of success or failure of institutions. Student performance predictions are vital to instructors and educational decision makers to help, across all levels, tailor learning according to the students’ needs. Therefore, it is essential for Higher Education Institutions to predict student performance in distance learning which has been, and remains, the primary method of learning in some countries due to Corona Virus pandemic. For this reason, this research is going to predetermine a fitting definition of student performance in time …

Covid-19 Diagnosis Using Spectral And Statistical Analysis Of Cough Recordings Based On The Combination Of Svd And Dwt, Thabit Sultan Mohammed, Awni Ismail Sultan, Khattab M. Ali Alheeti, Karim Mohammed Aljebory, Hasan Ismail Sultan, Muzhir Shaban Al-Ani

Baghdad Science Journal

Healthcare professionals routinely use audio signals, generated by the human body, to help diagnose disease or assess its progression. With new technologies, it is now possible to collect human-generated sounds, such as coughing. Audio-based machine learning technologies can be adopted for automatic analysis of collected data. Valuable and rich information can be obtained from the cough signal and extracting effective characteristics from a finite duration time interval that changes as a function of time. This article presents a proposed approach to the detection and diagnosis of COVID-19 through the processing of cough collected from patients suffering from the most common …

Coincidence Of Fixed Points With Mixed Monotone Property, Amal M. Hashim, Ali A. Kazem

Baghdad Science Journal

The purpose of this paper is to introduce and prove some coupled coincidence fixed point theorems for self mappings satisfying -contractive condition with rational expressions on complete partially ordered metric spaces involving altering distance functions with mixed monotone property of the mapping. Our results improve and unify a multitude of coupled fixed point theorems and generalize some recent results in partially ordered metric space. An example is given to show the validity of our main result.

Some K-Banhatti Polynomials Of First Dominating David Derived Networks, Anjaneyulu Mekala, Vijaya Chandra Kumar U, R. Murali

Baghdad Science Journal

Chemical compounds, characteristics, and molecular structures are inevitably connected. Topological indices are numerical values connected with chemical molecular graphs that contribute to understanding a chemical compounds physical qualities, chemical reactivity, and biological activity. In this study, we have obtained some topological properties of the first dominating David derived (DDD) networks and computed several K-Banhatti polynomials of the first type of DDD.

Science, Creativity, And The Copyright Clause, Ned Snow

UC Law Journal

The Constitution provides Congress the power to enact copyright laws in order “To promote the Progress of Science.” Some statements by the modern Supreme Court may be interpreted to suggest that “the Progress of Science” is synonymous with creativity, and most scholars articulate the purpose of copyright law in terms of encouraging creative expressions. This is troubling, however, because not all creative expressions yield public knowledge; indeed, some yield public harm. For example, false statements of fact that are made to purposefully deceive are highly creative, but those statements inhibit the spread of knowledge and may lead to demonstrably harmful …

A Gravity Model Integrating Land-Use And Transportation Policies For Sustainable Development: Case Study Of Fresno, California, Chih-Hao Wang, Na Chen

Mineta Transportation Institute

The idea of urban compaction has been long proposed and promoted to address the problem of urban sprawl in many American cities. However, there are still rare successful cases of such implementation in the United States. This study uses a classic gravity model, TELEM (Transpiration, Economic, and Land-Use Model) to examine to what extent a land-use or transportation policy must be regulated to make the urban compaction occur in a typical auto-dependent city—Fresno, California. Five scenarios are considered (BL, L1, L2, T1, and T2), in which the baseline (BL) is a natural growth scenario. Without any policy interventions, the city …

Using Thermal Remote Sensing To Quantify Impact Of Traffic On Urban Heat Islands During Covid, My-Thu Tran, Bo Yang

Mineta Transportation Institute

A three-month lockdown in the U.S. at the beginning of the COVID-19 outbreak in 2020 greatly reduced the traffic volume in many cities, especially large metropolitan areas such as the San Francisco Bay Area. This research explores the impact of transportation on climate change by using remote sensing technology and statistical analysis during the COVID-19 lockdown. Using thermal satellite data, this research measures the intensity of the urban heat island, the main driver for climate change during the urbanization process. The research team acquired morning and afternoon MODIS data in the same periods in 2019 before the pandemic and 2020 …