Digital Commons Network^™

Bending-Torsion Flutter Analysis Of A Viscoelastic Tapered Wing Carrying An Engine And Subjected To A Follower Thrust Force, Youssef Shaaban Abdelfattah Matter

Theses

Flutter, a dynamic divergent instability, is one of the significant phenomena of Aeroelasticity. This dangerous aeroelastic phenomenon can occur to any flexible structure subjected to aerodynamic forces such as aircraft wings, bridges, buildings, etc. It is important to analyze the flutter in order to predict the speed and frequency at which it occurs so that structural damages and failures can be avoided. This thesis is concerned with non-dimensional parametric modeling of the flutter of a viscoelastic tapered wing with an attached engine. The main objectives of this thesis are to determine regions of stability and boundaries of flutter speed and …

The Q-Gauss Product, Q-Trigonometry Via Landen-Like Identities, And Positive Alternating Q-Series, Sarah Abo Touk

Theses

The object of this report is q-series and their relationship with certain special functions. Firstly, Jackson’s q-analogue of the Euler gamma function is introduced and a q-analogue for a famous formula of Gauss on products of the gamma function will be presented. Secondly, Jacobi’s theta functions will be discussed in details and new Landenlike half argument formulas will be established. As an application, q-trigonometric formulas shall be derived and a new proof for a well-known q-series relation of Jacobi will be given. Thirdly, an extended Bailey transform will be presented and a variety of new q-series will be deduced as …

Behavior Of Steel Fiber-Reinforced Geopolymer Concrete Made With Recycled Concrete Aggregates, Abdalla Ahmed Moallim Hussein

Theses

Industrial by-products and recycled concrete aggregates (RCA) have the potential to fully replace cement and natural aggregates, respectively, in the production of concrete rather than being discarded wastefully into landfills or stockpiles. Yet, their combined use in the development of a novel RCA geopolymer concrete has been limited to nonstructural purposes, owing to the inferior mechanical and durability properties of said concrete. To improve the properties of geopolymer concrete made with RCA, steel fibers may be added to the mix. This research aims to study the feasibility of reutilizing locally available industrial solid wastes and RCA in geopolymer concrete for …

Development Of Piezoelectric Energy Harvesting System For Low-Frequency Vibrations, Mai Rabie Mahmoud Ismail

Theses

Harvesting energy from vibration sources has attracted the interest of researchers for the past three decades. Researchers have been working on the potential of achieving self-powered MEMS scale devices. Piezoelectric cantilever harvesters have caught the attention in this field because of the excellent combination of high-power density and compact structure. The main objective of this thesis is to develop a novel and optimum piezoelectric harvester system using lumped parameter model (LPM) for given vibration sources. The finite element model (FEM) is used in this work as an original approach to be utilized for optimal design optimization. Three types of validations …

Fabrication Of Chemically-Functionalized 3dprinted Porous Scaffolds For Biomedical Applications, Eiman Hamed Alblooshi

Theses

Hard tissues, such as bone and teeth, are natural composites of collagen nanofibers that are reinforced by inorganic calcium phosphate Nano crystallites, in the form of nanocomposites. The interlocking between these components in hard tissues explains their unique characteristics. Bone is mainly classified into two major types; compact and cancellous depending on the extent of porosity. Fractures in the compact bone can be treated using bone fixation implants, such as rods, screws, and plates, or can be totally replaced by bone implants if complete substitution is required. Cancellous bone, on the other hand, is highly porous and its substitution with …

Characterization And Bioactive Properties Of Young And Mature Soybean And Their Protein Hydrolysates, Amna Khalifa Alnuaimi

Theses

Soybeans are known for their high protein content that could be substituted for animal proteins. The potential bioactive properties of mature soybean (MS) proteins and their hydrolysates have been widely explored. The aim of this study was to investigate and compare various in-vitro bioactive properties (antioxidant, anti-diabetic, anti-obesity, and anti-inflammatory) of young soybean (YS) and MS flour and their protein hydrolysates when subjected to in-vitro simulated gastrointestinal digestion (SGID) and enzymatic hydrolysis, respectively. In the first phase, SGID of YS and MS flour was carried out to mimic the human digestion, while in the second phase, enzymatic hydrolysis of the …

Thermo Hydraulic Performance Of Polymer Double-Pipe Heat Exchanger For Single-Phase Heating/Cooling Application, Ahmed Mohamed Gafar

Theses

This thesis details the model-based study carried out for understanding the thermal and hydraulic performance of double pipe heat exchangers with and without pin-fins; both counter and parallel flow configurations are considered in the study. The pin-fins are located on the outer wall of the inner pipe thereby extending into the annulus and in this study, the hot fluid is assumed to pass through the annulus. The model consists of multiple governing equations such as continuity equations, Navier-Stokes equations, and energy equations. A fluent module of Ansys Workbench is used for conducting the model-based study. Double pipe heat exchangers constructed …

Modelling And Control Of A Two-Link Rigid-Flexible Manipulator, Rahma Saeed Rasheed Alnajjar

Theses

The literature lacks data on the reliability of 3D models created by Autodesk Inventor software and imported to MATLAB Simulink software in comparison to mathematically generated models. In this contribution, a two-link rigid-flexible manipulator modelled in two different methods was demonstrated, one of which is using Lagrange equations and Finite Element Method to generate a mathematical model of the manipulator, and the other is creating a 3D model with the aid of Autodesk Inventor then import to MATLAB Simulink, both models were subsequently controlled by three types of controllers, conventional PID controller, LQR controller, and LQG controller. The research demonstrated …

Electrodeposition Study Of Alloys For Solar Energy, Corrosion Resistance, And Battery Applications, Thaier Tawfeek Alawadh

Theses

Copper-Zinc-Tin sulphide (CZTS) compound is one of the alloys, which has significantly caught the attention of a considerable number of researchers since the beginning of the century. Consequently, academic laboratories started investigating the alloy in-depth with its various combination due to its valuable applications with high potential usage. The CZTS alloy has a high tendency to replace the current copper indium gallium selenide (CIGS) thin-film solar cell system due to scarcity of CIGS components, and toxic manufacturing procedures compared to CZTS. Nevertheless, CZTS is a new studied compound with exceptionally low photovoltaic empirical efficiency and an inadequate understanding of its …

Partial Oxidation Of Methane To Synthesis Gas Over Ni/Γ-Al₂O₃ Catalysts: The Effect Of The Structure And The Pre-Treatment Of The Support On The Catalysts’ Performance, Sheikh Tijan Jobe

Theses

Abundant natural gas is a potential source of more cost-effective energy and its effective utilization can significantly reduce the dependence on petroleum oil. Disadvantages of natural gas as a direct fuel include its low energy density by volume, and high cost of transportation, which resulted in its underutilization as an alternative energy source. Therefore, the conversion of methane to more easily-handled and value-added products is becoming a promising route for natural gas utilization. Compared to steam reforming of methane to syngas, which is the most commercially applied conversion process, partial oxidation is a more cost-effective promising route. While noble metals …

أحكام المسؤولیة القانونیة للروبوت الطبي, زینب مسعود علي

Theses

تعتبر الروبوتات الطبیة من أحدث تقنیات الذكاء الاصطناعي، والتي یتم استخدامھا في العدید من المجالات الطبیة كروبوتات الرعایة الصحیة التي تعتني بكبار السن أو المعاقین، والروبوتات الجراحیة التي یتم استخدامھا في العملیات الجراحیة. وتثیر الروبوتات الطبیة العدید من الإشكالیات القانونیة، منھا ما یتعلق بالجوانب الأخلاقیة ومنھا ما یتعلق بالجوانب الاجتماعیة، والمسؤولیة عن الأخطاء الطبیة التي تسببھا الروبوتات.

وعلیھ یسلط ھذا البحث الضوء على موضوع الروبوتات الطبیة، والنظام العام والإطار القانوني لھذه الروبوتات والمسؤولیة المترتبة علیھا. ویعرض ھذا البحث للإطار القانوني الحالي لروبوتات العنایة الصحیة والروبوتات الجراحیة، وإسقاطھا على قانون المسؤولیة الطبیة في دولة الإمارات، والبحث في الطبیعة القانونیة والأساس القانوني …

Performance Evaluation Of Cement-Free Geopolymer Concrete Made With Recycled Concrete Aggregates And Steel Fibers, Jamal Ahmad Husam Samer Medljy

Theses

Sustainable and innovative alternatives have been investigated to replace concrete’s main components, natural aggregates, and cement. Previous studies have been carried out to replace NA and cement with recycled concrete aggregates (RCA) and inorganic alkali-activated geopolymer binders, respectively. Yet, such sustainable concrete has only been proposed for non-structural purposes, owing to the inferior properties of RCA. This research work aims to assess the feasibility of reutilizing RCA from construction and demolition waste and locally available industrial solid by-products in the production of sustainable geopolymer concrete for structural applications. The binding materials were either in the form of a single precursor, …

Effectiveness Of Food Safety Training On Knowledge, Atitude, And Practices (Kap) Of Homebased Food Business (Hfb) In Al Ain, Uae, Mariam Mohammed Al Kaabi

Theses

This research aimed at evaluating the levels of knowledge, relevant attitudes, and food safety practices (KAP) of food handlers that have home food businesses (HFB) in Al Ain city, UAE. It examined the effectiveness of the Essential Food Safety Training Program (EFST) in providing food safety Knowledge, attitude, and practices. A quantitative research method was conducted using a sample of 68 participants who responded to the questionnaires. Three research questions were used to guide the study and explore the differences of the level of Knowledge, Attitudes, and Practice (KAP) before and after training program by using a paired-samples t-test. This …

Levels Of Testosterone Esters In Camel Hair, Aysha Khalid Alraeesi

Theses

Doping and steroid use represent a serious threat to animal health and can even lead to their untimely and painful death. However, doping is an acute problem in today's animal racing world, particularly in camel racing. Testosterone and its ten esters (benzoate, valerate, isocaproate, hexahydrobenzoate, decanoate, undecanoate, laurate, enanthate, cypionate, and caproate) are of utmost importance because when they are administered to animals it is difficult to measure them efficiently. The levels of testosterone and its esters in camels and other animals are typically determined using urine and blood tests. The aim of this study was to develop and validate …

Numerical Investigation Of Mesh-Based Enhancement Of Vapor Bubble Condensation, Omar Darwish Ali Alqadi Alhammadi

Theses

The aim of this work is to study the vapor bubble condensation process and the enhancement technique via affecting bubbles dynamic using a mesh-based structure. The bubble dynamics and thermal behavior are studied by considering the heat and mass transfer through the bubble’s interface area between the vapor and liquid regions and the resulting condensation effects. The thermal characteristics of bubbles are observed considering the initial and final liquid temperatures. Additionally, the bubble dynamics are studied in terms of several parameters including the relative velocity of the bubble, bubble deformation, interfacial area, and the bubble diameters. The relation between the …

The Impact Of An Enrichment Program On Uae High School Students’ Creative Problem Solving Skills, Alyazia Sulaiman Alshehhi

Theses

Training human resources to be creative and innovate in the UAE had become a significant matter recently to stay within the stage of progressing towards a more dependable economy rather than oil. Gifted and talented individuals are the country's main resources, and way to progress. This study, therefore, aims to explore the impact of an enrichment program on improving UAE high school gifted students’ creative problem-solving skills. The sample included 78 gifted students from Abu Dhabi government schools. The students were grouped randomly into a control group (27 students), and an experimental group (30 students) who were exposed to a …

The Relationship Among Social Competence, Social Skills, And Academic Achievement For Students With Specific Learning Disability In The Uae, Amna Salem Al Yahyaee

Theses

The objective of this study is fourfold. To examine the relationship between a) parental involvement in their children’s education and social competence, b) parental involvement in their children’s education and their children’s academic achievement, c) parental involvement in their children's social competence and their children’s academic achievement, and d) parental involvement in their children's social competence and their children’s social skills. Thirty parents of children with specific learning disabilities participated in this study. Quantitative analysis was used in this study to answer the research questions. The results of this study revealed that there was no statistically significant relationship between parents’ …

The Impact Of Digital Games Based Learning (Abacus) On Students’ Performance In Fraction For Fifth Grade Students In Al-Ain, Haneen Mazen Almassri

Theses

ABACUS active learn is an inclusive online site for teachers and students to illustrate and learn Mathematics in the primary level. ABACUS is considered as an online innovation that enables the students to have the ownership of their learning through interactive activities that can be done independently in the classroom or spend their rewards in online learning games. The main objective of this study is to examine the effect of using ABACUS on students’ performance of 5^th grade while studying Fractions. This study designed to be tested in Al-Ain, United Arab Emirates. A quasi-experimental design was used to collect …

Dynamics Biological Efficiency Of Basidiomycetes Fungi In Date Palm Leaf Waste Composting And Suitability As Growing Media, Fatema Saif Alkaabi

Theses

Soil quality and fertility status is grossly poor in arid regions. The problem is compounded due to lack of organic matter in the coarse sandy soil. Therefore, agricultural practices tend to use different organic materials like peat moss, perlite, etc., as organic materials. Despite the role of these growing media in improving the chemical and physical properties of soils, they are non-renewable resources and have high price in the market which make cultivation noneconomical. Hence, renewable resources like biowaste such as date palm leaf waste has been used as alternative source in the experiment to compare with other composting materials …

Scenario-Based Simulation Of Treatment Processes For Minimization Of Sludge Production From Al-Saad Wastewater Treatment Plant, Omar Gamil Abdelmajeed Hussien

Theses

The biological-activated sludge treatment process is the most widely used approach to treating domestic wastewater. It involves the transformation of soluble and particulate organic matter to gases and large amounts of settleable biomass (produced sludge). This sludge is considered one of the most pressing management challenges since its treatment represents approximately 50 to 60% of the total operational cost of a wastewater treatment plant (WWTP). The traditional management of excess sludge is by disposal in landfills, incineration, or agriculture reuse in the form of fertilizers but due to energy and environmental concerns, many jurisdictions developed strict policies and regulations for …

Transcriptomic Analysis Of The Glycophytic Crop Ipomoea Aquatica Under Salinity Conditions Compared To Its Wild Halophyte Relative Ipomoea Pes-Caprae, Ruwan Saeed Aljneibi Husam Saeed Aljneibi

Theses

This study focuses on the glycophytic crop Ipomoea Aquatica (commonly known as water spinach) and its wild halophytic relative Ipomoea pes-caprae. I. Aquatica is a crop with economic value; however, it is unable to tolerate high levels of salinity. Whereas its relative Ipomoea pes-caprae is able to grow and thrive in the harsh environment of the UAE. The main aim of this study is to analyze the genetic differences underlying the variation in the two plants’ response to salinity and determine the genetic components that can be used to enhance I. Aquatica's tolerance to salinity. Accordingly, the plants were subjected …

التنفیذ على الأموال المنقولة المرھونة (( دراسة تحلیلة وفقا للقانون الاتحادي رقم (4) لسنة 2020 في شأن ضمان الحقوق في الأموال المنقولة و قرار مجلس الوزراء رقم ( 57 ) في شأن اللائحة التنظیمیة للقانون الاتحادي رقم ( 11 ) لسنة 1992 بشأن قانون الإجراءات المدنیة, مھا یوسف یعقوب علي الحوسني

Theses

تتناول ھذه الدراسة التنفیذ على الأموال المنقولة المرھونة وھي دراسة تحلیلة بین كل من قانون اتحادي رقم ( 4) بشأن ضمان الحقوق في الأموال المنقولة و قرار مجلس الوزراء رقم (57 ) في شأن اللائحة التنظیمیة للقانون الاتحادي رقم ( 11 ) لسنة 1992 بشأن قانون الإجراءات المدنیة، وحیث تبینّ من خلال ھذه الدراسة أن ھناك نوعان من التنفیذ ھما التنفیذ دون اللجوء إلى المحكمة والتي تحتوي على التنفیذ بتملك أو بیع الضمانة (المال المرھون) وذلك دون تقدیم طلب لمحكمة التنفیذ ویكون باتفاق كل من المضمون لھ (الدائن المرتھن) والضامن (المدین الراھن) وھذا وفق ما جاء بھ قانون ضمان الحقوق …

Isabella D’Este's Evolution Of Art Patronage: A Study Of A Renaissance Woman Through Iconographic And Feminist Perspectives, Katie Reinkemeyer

Theses

This thesis is based on how Isabella d'Este (1474-1539) cultivated her extensive collection of rare antiques and art, given the parallel evolution of her art commissions and political concerns as it pertains to iconography and feminism. Instead of discussing what previous scholars have researched concerning Isabella d’Este, this thesis will incorporate the iconography as it pertains to her commissions in a historiographical sense, as well as argue why this iconography would eventually become a beacon for feminist discussion. This will primarily examine Isabella’s commissions from 1494 to 1507, including her earliest portraits and the first four paintings of her studiolo. …

Pedagogical Evaluation Of Cognitive Accessibility Learning Lab In The Classroom, Saad Khan

Theses

In a study conducted by Webaim, 98.1% of sites had a detectable accessibility issue. This poses a profound challenge to the 1 billion users across the world who have a disability. This indicates that developers either are not aware of how to make the sites accessible or aware of how critical it is to make the sites usable by all users. This problem is further compounded by the lack of available resources that can educate students and future developers in making their software accessible. To address current limitations/challenges, we have developed an all-in-one immersive learning experience known as the Accessibility …

Automatic Speech Recognition For Low-Resource And Morphologically Complex Languages, Ethan Morris

Theses

The application of deep neural networks to the task of acoustic modeling for automatic speech recognition (ASR) has resulted in dramatic decreases of word error rates, allowing for the use of this technology in smart phones and personal home assistants in high-resource languages. Developing ASR models of this caliber, however, requires hundreds or thousands of hours of transcribed speech recordings, which presents challenges for most of the world’s languages. In this work, we investigate the applicability of three distinct architectures that have previously been used for ASR in languages with limited training resources. We tested these architectures using publicly available …

Designing A Chemotherapy Infusion Center In Buffalo, New York Using Daylighting To Aid In The Healing Process, Claire Witt

Theses

Healthcare makes up a large amount of infrastructure and while today’s designs have vastly improved over the years, incorporating more natural light can improve not only staff’s performance but also enhance a patient healing experience. Daylighting is one of the most powerful, natural product designers can use in projects. Healthcare facilities have a goal in mind when designing a hospital such as the patients healing, overall experience, and their comfort. To continue to achieve improvements in patient care, it is important to constantly evaluate current means and methods, with one element that influences the delivery of care is the design …

Api Recommendation Using Domain And Source Code Knowledge, Rana Kareem Talib Al-Rubaye

Theses

The process of migration the old retired API(Application Programming Interface) with new and most to up to date one, know as API migration. Developers need to fully understand the documentation for the retired (replaced) library and the new (replacing) library to do the appropriate migration. This manual process is complex, error-prone, and costly for companies. There have been many studies focused on the automation recommendation between different method mapping for different libraries. These studies focused on the recommendations between methods from different programming languages while non of them focused on the recommendations between methods of libraries that belong to the …

Understanding The Themes Of Disability Discourse Through Reddit Comments, Brandon Palonis

Theses

With the advent of internet forums, sharing opinions in a public sphere has never been easier, especially for those facing marginalization in their communities. Forums offer a neutral, semi-anonymous space wherein people may feel more compelled to share intimate details about the characteristics of their lives. This paper focuses on internet forums related to disabilities, specifically those found on Reddit, and uses Latent Dirichlet Allocation (LDA) to extract topics from the corpus of 3 subreddits: r/Blind, r/ADHD, and r/Disability. The features are then put into key term groups that are defined by a key phrase. This created category taxonomy is …

Performance Of Cement-Free Geopolymer Concrete Made With Ceramic Waste Powder Using Taguchi Method, Ponalagappan Chokkalingam

Theses

The ceramic industry produces a substantial amount of waste during its production processes. Recycling and reutilizing such ceramic waste is a challenge due to its extended biodegradation period. Consequently, the ceramic industry is dedicated to attaining a sustainable solution to dispose of this waste rather than discarding it wastefully into landfills or stockpiles. In turn, the demand for ordinary Portland cement has been on a steady increase, leading to concerns about the sustainability of the construction industry. As a sustainable alternative to cement, alkali-activated binders have been proposed owing to their ability to reduce carbon emissions, preserve nonrenewable natural resources, …

Development Of Heat Insulation Composite Materials Based On Bio-Polyesters And Natural Filler, Hyder Ali Reyah Al Abdallah

Theses

The increasing waste - bio or synthetic - is a critical issue, and managing this waste is a huge challenge for industry and academia. The use of biodegradable materials is sought as an eventual factor in decreasing the current level of waste generation. Therefore, one of the main research areas nowadays is to develop bio-composite materials over fuel-based materials where the bio-composites or waste-based composites serve several advantages both environmentally and economically, including the biodegradability feature of the bio fillers, and the affordability due to its abundant presence in nature. Bio-waste, specifically from agricultural sources, can be used as fillers …