Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Electrical and Computer Engineering (1177)
- Civil and Environmental Engineering (668)
- Mechanical Engineering (654)
- Physical Sciences and Mathematics (633)
- Electrical and Electronics (400)
-
- Civil Engineering (373)
- Computer Engineering (341)
- Physics (298)
- Electromagnetics and Photonics (292)
- Optics (270)
- Materials Science and Engineering (267)
- Computer Sciences (249)
- Operations Research, Systems Engineering and Industrial Engineering (249)
- Biomedical Engineering and Bioengineering (229)
- Chemical Engineering (229)
- Industrial Engineering (216)
- Environmental Engineering (188)
- Power and Energy (111)
- Aerospace Engineering (106)
- Transportation Engineering (82)
- Bioresource and Agricultural Engineering (73)
- Life Sciences (70)
- Environmental Sciences (58)
- Biomechanical Engineering (53)
- Medicine and Health Sciences (49)
- Engineering Science and Materials (47)
- Biomechanics and Biotransport (46)
- Social and Behavioral Sciences (46)
- Water Resource Management (44)
- Institution
- Keyword
-
- Daniel Felix Ritchie School of Engineering and Computer Science (332)
- Electrical and Computer Engineering (90)
- Mechanical and Materials Engineering (88)
- Machine learning (67)
- Simulation (65)
-
- Modeling (38)
- Computer vision (37)
- Optimization (32)
- Renewable energy (27)
- Additive manufacturing (26)
- Artificial intelligence (26)
- Computer Science (26)
- Deep learning (26)
- Computational fluid dynamics (22)
- Robotics (22)
- CFD (20)
- Optics (20)
- Finite element analysis (18)
- Remote sensing (18)
- Biomechanics (17)
- Data mining (17)
- MEMS (17)
- Machine Learning (17)
- Heat transfer (16)
- Nonlinear optics (16)
- Classification (15)
- Diffusion (15)
- Microstructure (15)
- Nanoparticles (15)
- Corrosion (14)
- Publication Year
Articles 1771 - 1800 of 4180
Full-Text Articles in Engineering
Fabrication And Investigation Of An Enzyme-Free, Nanoparticle-Based Biosensor For Hydrogen Peroxide Determination, Craig Neal
Electronic Theses and Dissertations
Electrochemical biosensors often employ enzymes as detection elements. These sensors are highly selective towards target analytes, however the scope of their application is limited by the poor stability of the enzyme. In this study, multi-valent inorganic cerium oxide nanoparticles were used as detection elements for the analysis of hydrogen peroxide. The electrochemical response of the cerium oxide towards hydrogen peroxide analyte is defined through cyclic voltammetry and chronoamperometry. This response was found to be dependent on nanoparticle Ce3+:Ce4+ redox state ratio and this property is exploited to fabricate a biosensor. As produced, the biosensor demonstrated sensitivity at picomolar analyte concentrations. …
Modeling Mass Transfer And Assessing Cost And Performance Of A Hollow Fiber Nanofiltration Membrane Process, David Yonge
Modeling Mass Transfer And Assessing Cost And Performance Of A Hollow Fiber Nanofiltration Membrane Process, David Yonge
Electronic Theses and Dissertations
Bench-scale water treatment testing of three next generation hollow-fiber (HF) nanofiltration (NF) membranes was conducted to characterize divalent ion rejection capabilities and investigate removal mechanisms. Existing mathematical models were investigated to describe solute transport using synthetic magnesium sulfate solutions including the size exclusion model, homogenous solution diffusion (HSD) model, dimensional analysis, and the HSD model incorporating film theory. Solute transport for two of the membranes were described by HSD theory and were predictive of their 90% divalent ion removal. A third membrane was more accurately modeled using size exclusion and was found to be predictive of its 40% divalent ion …
Data Mining Models For Tackling High Dimensional Datasets And Outliers, Orestis Panos Panagopoulos
Data Mining Models For Tackling High Dimensional Datasets And Outliers, Orestis Panos Panagopoulos
Electronic Theses and Dissertations
High dimensional data and the presence of outliers in data each pose a serious challenge in supervised learning. Datasets with significantly larger number of features compared to samples arise in various areas, including business analytics and biomedical applications. Such datasets pose a serious challenge to standard statistical methods and render many existing classification techniques impractical. The generalization ability of many classification algorithms is compromised due to the so-called curse of dimensionality. A new binary classification method called constrained subspace classifier (CSC) is proposed for such high dimensional datasets. CSC improves on an earlier proposed classification method called local subspace classifier …
Investigation Of The Effect Of Rain On Sea Surface Salinity, Andrea Santos Garcia
Investigation Of The Effect Of Rain On Sea Surface Salinity, Andrea Santos Garcia
Electronic Theses and Dissertations
The Aquarius/SAC-D mission provided Sea Surface Salinity (SSS), globally over the ocean, for almost 4 years. As a member of the AQ/SAC-D Cal/Val team, the Central Florida Remote Sensing Laboratory has analyzed these salinity measurements in the presence of precipitation and has noted the high correlation between the spatial patterns of reduced SSS and the spatial distribution of rain. It was determined that this is the result of a cause and effect relation, and not SSS measurement errors. Thus, it is important to understand these salinity changes due to seawater dilution by rain and the associated near-surface salinity strati?cation. This …
System Frequency Support Of Permanent Magnet Synchronous Generator-Based Wind Power Plant, Ziping Wu
System Frequency Support Of Permanent Magnet Synchronous Generator-Based Wind Power Plant, Ziping Wu
Electronic Theses and Dissertations
With ever-increasing penetration of wind power into modern electric grids all over the world, a trending replacement of conventional synchronous generators by large wind power plants will likely result in the poor overall frequency regulation performance. On the other hand, permanent magnet synchronous generator wind Turbine System (PMSG-WTG) with full power back to back converters tends to become one of the most promising wind turbine technologies thanks to various advantages. It possesses a significant amount of kinetic energy stored in the rotating mass of turbine blades, which can be utilized to enhance the total inertia of power system. Additionally, the …
Implementation Of An Air Supply Unit Control Scheme For The Uc2av (Unmanned Circulation Control Aerial Vehicle), Cameron Rosen
Implementation Of An Air Supply Unit Control Scheme For The Uc2av (Unmanned Circulation Control Aerial Vehicle), Cameron Rosen
Electronic Theses and Dissertations
The expanded prevalence of Unmanned Aerial Vehicles (UAVs) in recent years has created many opportunities to research novel applications for their use, enabled by the reduced cost, mission flexibility, and reduced risk that small-scale unmanned platforms provide in comparison to larger aircraft. Despite the versatility of unmanned aviation, limitations on payload size and weight, fuel and power capacity, and takeoff and landing infrastructure can restrict UAV applications, and have created a need for lift augmenting technologies that can reduce the impact of these limitations. Circulation Control (CC) is an active flow technique that has been proven as a method for …
Stability Sensitivity Of Low-Rise Steel-Moment Framed Buildings To Hazard-Independent Damage, Trey Reynolds Powell
Stability Sensitivity Of Low-Rise Steel-Moment Framed Buildings To Hazard-Independent Damage, Trey Reynolds Powell
Electronic Theses and Dissertations
Structural stability has been the subject of much research in recent years. Simply, structural stability may be vieas the ability of the structure’s response to be relatively unaffected by perturbations to its system. Stability of low-rise steel-moment framed buildings and their sensitivity to perturbations from significant damage are the focus of this work. Perturbations, or changes from the normal state of the structural system, have the ability to affect the structural response. Second-order geometric effects imposed through column axial loads, and/or initial out-of-plumbness during the construction process, are a comperturbation in steel framing systems. If the structural members subjected to …
Acoustic Behavior Of Soil Reinforced With Grass Roots, Blake Armstrong
Acoustic Behavior Of Soil Reinforced With Grass Roots, Blake Armstrong
Electronic Theses and Dissertations
Civil engineering practice has shown that vegetative roots on slopes and streambanks can substantially increase shear strength of soil and reduce erosion. Research has been done to understand and quantify the effect. Most studies have been conducted on slopes and streambanks with woody vegetation. Past research has used a perpendicular root model to predict increase in cohesion, or shear strength, due to the mobilization of roots' tensile strength. Acoustics can be used to monitor internal changes of soil by interacting with soil particles and interstitial fluids. Compressional wave, or p-wave, velocity can be used to predict changes in effective stress …
Performance Evaluation And Improvement Of Wireless Amplify-And-Forward Cooperative-Based Systems Under Nodes Mobility And Imperfect Csi Estimation Impacts, Yazid Khattabi
Electronic Theses and Dissertations
Cooperative communication techniques have been introduced in wireless networks to achieve spacial diversity-gain via the readiness of multiple users (via relays) to assist a source forwarding its data to a final destination. Cooperative communication techniques have shown their capability in improving system reliability and extending coverage area, and hence, it is believable that they will act as a promising technology for the coming fifth-generation (5G). Nevertheless, most existing work reported in literature on performance studies of wireless cooperative-based systems are based on the assumptions that the multipath fading channels among systems cooperating nodes are quasi-static (i.e., fading channels coefficients are …
Using Case-Based Reasoning For Simulation Modeling In Healthcare, Khaled Alshareef
Using Case-Based Reasoning For Simulation Modeling In Healthcare, Khaled Alshareef
Electronic Theses and Dissertations
The healthcare system is always defined as a complex system. At its core, it is a system composed of people and processes and requires performance of different tasks and duties. This complexity means that the healthcare system has many stakeholders with different interests, resulting in the emergence of many problems such as increasing healthcare costs, limited resources and low utilization, limited facilities and workforce, and poor quality of services. The use of simulation techniques to aid in solving healthcare problems is not new, but it has increased in recent years. This application faces many challenges, including a lack of real …
Smart Grid Demonstration: Distributed Active And Reactive Power Control, Siddarth Vellakovil Rajamani
Smart Grid Demonstration: Distributed Active And Reactive Power Control, Siddarth Vellakovil Rajamani
Electronic Theses and Dissertations
The present infrastructure of energy delivery was designed over 60 years ago with the goal to be centralized. However, it is aging and is under-utilized, which will potentially limit the world's ability to achieve its energy objective. The lack of vibrant control on the grid makes it difficult to stop cascading power failure, and to achieve high penetration of renewable energy resources, such as wind and solar thus resulting in grid instability. A decentralized and distributed control mechanism implemented with a definite communication protocol solves the issues mentioned above. The electric power grid going into the future is expected to …
Fundamental Understanding Of Interactions Among Flow, Turbulence, And Heat Transfer In Jet Impingement Cooling, Md. Jahed Hossain
Fundamental Understanding Of Interactions Among Flow, Turbulence, And Heat Transfer In Jet Impingement Cooling, Md. Jahed Hossain
Electronic Theses and Dissertations
The flow physics of impinging jet is very complex and is not fully understood yet. The flow field in an impingement problem comprised of three different distinct regions: a free jet with a potential core, a stagnation region where the velocity goes to zero as the jet impinges onto the wall and a creation of wall jet region where the boundary layer grows radially outward after impinging. Since impingement itself is a broad topic, effort is being made in the current study to narrow down on three particular geometric configurations (a narrow wall, an array impingement configuration and a curved …
Forced Convection Cooling Of Electric Motors Using Enhanced Surfaces, Mohammed Almaghrabi
Forced Convection Cooling Of Electric Motors Using Enhanced Surfaces, Mohammed Almaghrabi
Electronic Theses and Dissertations
Electric motors are extensively engaged in industrial and commercial applications such as electrical cars, energy-conversion systems, elevators, and actuators for aircrafts. Due to the significant internal heat generation, it is usually a challenge to design and manufacture high power density, high reliability, and low cost electric motors with superior performance. One of the efficient ways to dissipate the heat generated in the electrical motor is by using extended surfaces (i.e. heat sinks). These surfaces are extruded from the motor casing and air is forced though them by a cooling fan. This cooling approach is simple to be implemented and has …
Deposition And Characterization Studies Of Boron Carbon Nitride (Bcn) Thin Films Prepared By Dual Target Sputtering, Adithya Prakash
Deposition And Characterization Studies Of Boron Carbon Nitride (Bcn) Thin Films Prepared By Dual Target Sputtering, Adithya Prakash
Electronic Theses and Dissertations
As complementary metal-oxide semiconductor (CMOS) devices shrink to smaller size, the problems related to circuit performance such as critical path signal delay are becoming a pressing issue. These delays are a result of resistance and capacitance product (RC time constant) of the interconnect circuit. A novel material with reduced dielectric constants may compromise both the thermal and mechanical properties that can lead to die cracking during package and other reliability issues. Boron carbon nitride (BCN) compounds have been expected to combine the excellent properties of boron carbide (B4C), boron nitride (BN) and carbon nitride (C3N4), with their properties adjustable, depending …
Assessing Safety Culture Among Personnel In Governmental Construction Sites At Saudi Arabia: A Quantitative Study Approach, Omar Alrehaili
Assessing Safety Culture Among Personnel In Governmental Construction Sites At Saudi Arabia: A Quantitative Study Approach, Omar Alrehaili
Electronic Theses and Dissertations
Safety is an essential issue for organizations to survive, especially for hazardous industries such as the construction industry. The construction industry is considered to be one of the major industries that help in the growth of the economy and the infrastructure of all countries. Recently, scholars have paid increasing attention to the concept of safety culture due to its role in decreasing the occurrences of accidents and injuries. Safety culture has become the focus of all industries and has received much attention in recent years, especially within the construction industry. Absence of this culture is a major cause of injuries …
A Multi-Scale Approach To Study Solid Oxide Fuel Cells: From Mechanical Properties And Crystal Structure Of The Cell's Materials To The Development Of An Interactive And Interconnected Educational Tool, Amjad Aman
Electronic Theses and Dissertations
Solid Oxide Fuel Cells are energy conversion devices that convert chemical energy of a fuel directly into electrical energy. They are known for being fuel-flexible, have minimal harmful emissions, ideal for combined heat and power applications, highly energy-efficient when combined with gas or steam turbines. The current challenges facing the widespread adoption these fuel cells include cost reduction, long-term testing of fully integrated systems, improving the fuel cell stack and system performance, and studies related to reliability, robustness and durability. The goal of this dissertation is to further the understanding of the mechanical properties and crystal structure of materials used …
Localization And Mapping Of Unknown Locations And Tunnels With Unmanned Ground Vehicles, Doris Turnage
Localization And Mapping Of Unknown Locations And Tunnels With Unmanned Ground Vehicles, Doris Turnage
Electronic Theses and Dissertations
The main goals of this research were to enhance a commercial off the shelf (COTS) software platform to support unmanned ground vehicles (UGVs) exploring the complex environment of tunnels, to test the platform within a simulation environment, and to validate the architecture through field testing. Developing this platform will enhance the U. S. Army Engineering Research and Development Center’s (ERDC’s) current capabilities and create a safe and efficient autonomous vehicle to perform the following functions within tunnels: (1) localization (e.g., position tracking) and mapping of its environment, (2) traversing varied terrains, (3) sensing the environment for objects of interest, and …
Investigation Of Parameters Enabling Admicellar Reversible Addition-Fragmentation Chain Transfer (Raft) Polymerization, Poh Lee Cheah
Investigation Of Parameters Enabling Admicellar Reversible Addition-Fragmentation Chain Transfer (Raft) Polymerization, Poh Lee Cheah
Electronic Theses and Dissertations
To date, enormous studies on admicellar polymerization have been recorded since the initial reports in the 1980’s. This technique which offered the advantage of using inexpensive materials and facile procedures, proven to be a successful surface modification technique. Nevertheless, one has to tailor every particular case due to the contribution of various factors in the process. Therefore, understanding the fundamentals parameters affecting the characteristics of polymer formed by admicellar polymerization have become a great interest. The effect of oxygen on the requisite amount of initiator and the polymer formed through the admicellar polymerization of styrene on silica particles was studied …
Rain Induced Runoff Simulation Using A 2d Numerical Model, Tahmina Shirmeen
Rain Induced Runoff Simulation Using A 2d Numerical Model, Tahmina Shirmeen
Electronic Theses and Dissertations
Runoff plays an important role in the agricultural and urbanized environments. Surface runoff is determined primarily by the amount of precipitation and by infiltration characteristics related to soil type, soil moisture, antecedent rainfall, land cover type, impervious surfaces, and surface retention. In this study, CCHE2D, a numerical model for free surface flow hydrodynamics, is applied to study the rain induced runoff and channel flow mixed problems. The main goal of this study is to incorporate rainfall as an input into the existing free surface flow model, CCHE2D; to verify and validate the CCHE2D model’s runoff simulation capability using analytical solutions …
Cargo Shipping Demand Modeling, Infrastructure Mapping, And Emission Impacts Of Selected U.S. Ports, Robert Coffman Richardson
Cargo Shipping Demand Modeling, Infrastructure Mapping, And Emission Impacts Of Selected U.S. Ports, Robert Coffman Richardson
Electronic Theses and Dissertations
This research included shipping demand modeling, infrastructure asset mapping, and impacts of carbon dioxide (co2) emission. The current volume of imports and exports was reviefor U.S. ports in the east coast, gulf coast, and west coast regions. The import and export of goods is a major part of the U.S. economy, and the volume of cargo handled by U.S. ports is expected to increase in the future as population increases. The major motivation for this thesis was the need for U.S. ports to make plans now to accommodate this expected growth in volume. Ports distribute commodities throughout the U.S., and …
Development Of A Dynamic Coupled Hydro-Geomechanical Code And Its Application To Induced Seismicity, Md Mamun Miah
Development Of A Dynamic Coupled Hydro-Geomechanical Code And Its Application To Induced Seismicity, Md Mamun Miah
Electronic Theses and Dissertations
No abstract provided.
Dynamic Thermal Management Of Vertically Stacked Heterogeneous Processors, Ajay Sharma
Dynamic Thermal Management Of Vertically Stacked Heterogeneous Processors, Ajay Sharma
Electronic Theses and Dissertations
No abstract provided.
Bacteria Prediction For Recreational Waters Through The Use Of Artificial Neural Networks, Christopher Douglas
Bacteria Prediction For Recreational Waters Through The Use Of Artificial Neural Networks, Christopher Douglas
Electronic Theses and Dissertations
Many scientists and government agencies rely on Fecal Indicator Bacteria (FIB) to determine the risk of exposure to pathogens in water. If there is a presence of these indicator bacteria, pathogenic microorganisms may also be present. These bacteria in recreational water bodies pose a health threat to people if ingested during activities such as swimming or from the consumption of marine life. The most commonly tested FIBs are total coliforms, Fecal coliforms, Escherichia coli, Fecal streptococci, and enterococci. The measurement of bacteria can be time consuming (up to 48 hours) and expensive, creating a difficulty in warning the public of …
Low-Velocity Impact To High-Temperature Low-Sag Overhead Conductors, Daniel Halka Waters
Low-Velocity Impact To High-Temperature Low-Sag Overhead Conductors, Daniel Halka Waters
Electronic Theses and Dissertations
High-Temperature Low-Sag (HTLS) conductors, such as Aluminum Conductor Composite Core (ACCC), improve infrastructure to support the delivery of power to meet the nation's increasing demand for electricity. Their response to low-velocity impacts during transportation, installation or in service, however, has not been addressed in the past. Therefore, this study investigates both experimentally and numerically mechanical effects associated with transverse low-velocity impacts on energy dissipation by the conductors subjected to either free or constrained end conditions and large axial tensile loads. Impact experiments were conducted using a newly designed and manufactured testing apparatus. The experimental work was strongly supported by non-linear …
Anatomy, Implant Selection And Placement Influence Spine Mechanics Associated With Total Disc Replacement, Justin F.M. Hollenbeck
Anatomy, Implant Selection And Placement Influence Spine Mechanics Associated With Total Disc Replacement, Justin F.M. Hollenbeck
Electronic Theses and Dissertations
Through aging and injury, the intervertebral disc of the lumbar spine can undergo degeneration, leading to collapse of the vertebrae and low back pain, a symptom that affects half the adult population in any given year. In an effort to reduce low back pain, total disc replacement treatment removes the degenerated disc, restores natural height and lordosis of the segment, and preserves motion at the joint. Patient anatomy, implant selection, and implant placement play significant roles in a patient's outcomes after total disc replacement surgery. Thus, the objective of the work presented in this thesis was to develop a suite …
Regional Mechanical Properties And Microstructure Of Ovine Heart Chambers, Shahnaz Javani
Regional Mechanical Properties And Microstructure Of Ovine Heart Chambers, Shahnaz Javani
Electronic Theses and Dissertations
Mechanical properties of cardiac tissue play an important role in the normal heart function. As a baseline for understanding of physiology and pathophysiology of the heart, and for development and validation of new therapies, it is crucial to first understand the mechanical behavior of the normal heart tissue. Although heart chambers have the same embryonic origin, differences in the development of mechanical properties are expected to manifest over time during the adulthood period. Therefore, the goal of this study was to determine the passive mechanical properties of all heart chambers through a paired comparison study in an ovine model. Ovine …
Multiscale Musculoskeletal Modeling Of The Lower Limb To Perform Personalized Simulations Of Movement, Alessandro Navacchia
Multiscale Musculoskeletal Modeling Of The Lower Limb To Perform Personalized Simulations Of Movement, Alessandro Navacchia
Electronic Theses and Dissertations
Computational modeling has been used for many decades to inform design and decision-making in several fields of engineering, such as aerospace, automotive, petroleum, and others. However, it still struggles to have a similar impact in fields of medicine, such as orthopaedics. Three of the challenges that have limited the use of computational modeling in the clinical practice and in product development are model validation, personalization, and realism. Validation is a challenge because several internal parameters of the human body, such as muscle forces, are not safely measurable in vivo and, consequently, a thorough comparison between model outputs …
A Framework To Generate A Smart Manufacturing System Configurations Using Agents And Optimization, Khalid Nagadi
A Framework To Generate A Smart Manufacturing System Configurations Using Agents And Optimization, Khalid Nagadi
Electronic Theses and Dissertations
Manufacturing is a crucial element in the global economy. During the last decade, the national manufacturing sector loses nearly 30% of its workforce and investments. Consequently, the quality of the domestic goods, global share, and manufacturing capabilities has been declined. Therefore, innovative ways to optimize the usage of the Smart Manufacturing Systems (SMS) are required to form a new manufacturing era. This research is presenting a framework to optimize the design of SMS. This includes the determination of the suitable machines that can perform the job efficiently, the quantity of those machines, and the potential messaging system required for sharing …
Geolocation Of Diseased Leaves In Strawberry Orchards For A Custom-Designed Octorotor, Christian Garcia
Geolocation Of Diseased Leaves In Strawberry Orchards For A Custom-Designed Octorotor, Christian Garcia
Electronic Theses and Dissertations
In recent years, technological advances have shown a strive for more automated processes in agriculture, as seem with the use of unmanned aerial vehicles (UAVs) with onboard sensors in many applications, including disease detection and yield prediction. In this thesis, an octorotor UAV is presented that was designed, built, and flight tested, with features that are custom-designed for strawberry orchard disease detection. To further automate the disease scouting operation, geolocation, or the process of determining global position coordinates of identified diseased regions based on images taken, is investigated. A Kalman filter is designed, based on a linear measurement model derived …
Using Fluorescence To Characterize Four Day Simulated Distribution System Trihalomethane Content In Florida Groundwaters, Jonathan Ousley
Using Fluorescence To Characterize Four Day Simulated Distribution System Trihalomethane Content In Florida Groundwaters, Jonathan Ousley
Electronic Theses and Dissertations
The United States Environmental Protection Agency (USEPA) regulates public water systems and has established limits for certain disinfection by products (DBPs) that have been linked to health effects, such as bladder cancer. The regulation of DBPs, specifically total trihalomethanes (TTHMs) and haloacetic acids (HAAs), have encouraged water treatment professionals to assess the type and amount of organic precursors in their supplies. Three of the more common water quality parameters that are monitored as DBP surrogates include dissolved organic carbon (DOC), ultraviolet absorbance (UV254), and specific ultraviolet absorbance (SUVA). Although DOC, UV254, and SUVA have been effectively correlated to DBP formation, …