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Articles 1861 - 1890 of 3180

Full-Text Articles in Engineering

Comparative Analysis Of Flood Frequency Based On Radar-Based Precipitation Data And Precipitation Trends, Simeon Andrew Benson Jan 2014

Comparative Analysis Of Flood Frequency Based On Radar-Based Precipitation Data And Precipitation Trends, Simeon Andrew Benson

Civil Engineering Theses - Archive

This study utilizes radar-based precipitation data from the National Weather Service West Gulf River Forecast Center to extract the depth-area-duration relationships via the U.S. Army Corps of Engineers' software HEC-MetVue. Extreme storms from 1997-2013 were analyzed to determine the characteristics for synthetic design storms. Design storms of 10, 25, 50 and 100 year return periods were developed and simulated using the U.S. Army Corps of Engineers' hydrologic modeling tool, HEC-HMS. Finally, flood frequency analysis using the existing method was carried out for comparison and hydrologic impact assessment. The depth-area-duration curves produced were converted to areal-reduction factors for comparison with Technical …

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Strength And Stiffness Characteristics Of Lime Stabilized Soil In A Flexible Pavement Design, Andrew James Domke Jan 2014

Strength And Stiffness Characteristics Of Lime Stabilized Soil In A Flexible Pavement Design, Andrew James Domke

Civil Engineering Theses - Archive

Lime treatment has proven to be a useful tool for stabilizing expansive soils. Expansive soils cause major damage to flexible and rigid pavements every year, since seasonal changes in soil moisture creates cyclical changes in the forces acting on a pavement. The use of lime to stabilize soil can reduce the soil's swell potential and add strength and stiffness to a pavement's subgrade. Due to the improved physical properties, lime stabilized soil (LSS) can be considered as part of the structural pavement layers. Utilizing LSS as a subbase in the pavement structure can reduce the thickness of the more expensive …

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Long-Term Effects Of Synthetic Fibers On Concrete Pipes, Sasan Farrokhi Gozarchi Jan 2014

Long-Term Effects Of Synthetic Fibers On Concrete Pipes, Sasan Farrokhi Gozarchi

Civil Engineering Theses - Archive

The studies undertaken by this research were to evaluate the long-term performance and durability of synthetic fiber-reinforced concrete pipes. The target long-term performance is for 9000 hours. Two sets of pipes 8 ft. (2400 mm) long with inside diameters of 24 in. (600 mm) and 36 in. (1200 mm) were manufactured, with a wall thickness of 3 and 4 in., respectively. The pipes were produced based on ASTM C76, for a Class III type with a Wall B. The two set of pipes included RCP's (as control) and SYN-FRCP's. The SYN-FRCP's had several fiber dosages ranging from 6 lb/yd3 (3.5 …

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Prefrontal Responses To Digit Span Memory Phases In Patients With Post-Traumatic Stress Disorder (Ptsd): A Functional Near Infrared Spectroscopy Study, Fenghua Tian, Amarnath Yennu, Alexa Smith-Osborne, F. Gonzalez-Lima, Carol S. North, Hanli Liu Jan 2014

Prefrontal Responses To Digit Span Memory Phases In Patients With Post-Traumatic Stress Disorder (Ptsd): A Functional Near Infrared Spectroscopy Study, Fenghua Tian, Amarnath Yennu, Alexa Smith-Osborne, F. Gonzalez-Lima, Carol S. North, Hanli Liu

Bioengineering Faculty Publications - Archive

Neuroimaging studies of post-traumatic stress disorder (PTSD)-related memory impairments have consistently implicated abnormal activities in the frontal and parietal lobes. However, most studies have used block designs and could not dissociate the multiple phases of working memory. In this study, the involvement of the prefrontal cortex in working memory phases was assessed among veterans with PTSD and age-/ gender-matched healthy controls. Multichannel functional near infrared spectroscopy (fNIRS) was utilized to measure prefrontal cortex hemodynamic activations during memory of neutral (i.e., not trauma-related) forward and backward digit span tasks. An event-related experimental design was utilized to dissociate the different phases (i.e., …

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Computer Vision Aided Bridge Monitoring System, Sushruth Mune Gowda Jan 2014

Computer Vision Aided Bridge Monitoring System, Sushruth Mune Gowda

Electrical Engineering Theses - Archive

Supervising Professor: Roger Walker With bridges representing a significant part of the road network in the United States, continual monitoring and early detection of deterioration in these structures is vital to prevent expensive repairs or catastrophic failures. Advances in sensing and information technologies help in monitoring and evaluating the health of a bridge. Currently, all the bridge monitoring systems are static in nature. With the help of TxDOTs Pavement Management Information System (PMIS) survey, the proposed mobile Bridge Monitoring System will periodically monitor these structural changes and help the maintanance management decision making process. The mobile Bridge Monitoring System has …

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The Study Of The Effect Of Smart Meter Rf Transmissions On Ground Fault Circuit Interrupters, Simon Donahue Jan 2014

The Study Of The Effect Of Smart Meter Rf Transmissions On Ground Fault Circuit Interrupters, Simon Donahue

Electrical Engineering Theses - Archive

Research and development is currently being performed to transform the United States' utility electric grid into a `Smart Grid' with the purpose of more efficiently distributing power, giving more control over the grid itself, and creating the potential savings for consumers. Smart Meters are among the first intelligent metering devices used within the `Smart Grid' concept, allowing consumers to effectively track their power usage within their home. They have thus far been deployed in thousands of commercial and residential electrical installations around the US. While the wide scale deployment of these devices has initially proven very successful, there is still …

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Modeling The Capillary Discharge Of An Electrothermal (Et) Launcher, Travis Least Jan 2014

Modeling The Capillary Discharge Of An Electrothermal (Et) Launcher, Travis Least

Electrical Engineering Theses - Archive

Over the past few decades, different branches of the US Department of Defense (DoD) have invested at improving the field ability of electromagnetic launchers. One such focus has been on achieving hypervelocity launch velocities in excess of 7 km/s for direct launch to space applications [1]. It has been shown that pre-injection is required for this to be achieved. One method of pre-injection which has promise involves using an electro-thermal (ET) due to its ability to achieve the desired velocities with a minimal amount of hot plasma injected into the launcher behind the projectile. Despite the demonstration of pre-injection using …

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A Literature Review On Neuro-Cognitive Learning And Control, Patanjalikumar Shashankkumar Joshi Jan 2014

A Literature Review On Neuro-Cognitive Learning And Control, Patanjalikumar Shashankkumar Joshi

Electrical Engineering Theses - Archive

This thesis is an effort to provide a foundation work linking neuroscience, psychology and control theory as a part of research going on developing fast satisficing autonomous systems at the University of Texas at Arlington Research Institute (UTARI). This literature review, the compilation is aimed to facilitate information and references needed for neurocognition and control. There is so much research going on to understand the neural mechanisms of a mammal brain, especially human brain. Although it is not fully understood, there are proposed and proven theories that address intelligence, various learning and decision making processes performed by various parts of …

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Flexible Mems Sensors And Pyroelectric Thin Films, Moinuddin Ahmed Jan 2014

Flexible Mems Sensors And Pyroelectric Thin Films, Moinuddin Ahmed

Electrical Engineering Dissertations - Archive

MEMS sensors on flexible substrates were developed and fabricated utilizing conventional lithography, deposition and etching tools. All of these sensors were fabricated in a MESA structure on the flexible substrates for tactile sensing, robotic, and biomedical applications. In addition, a new processing technique was developed to release the flexible substrate more easily from the rigid silicon carrier wafer to increase fabrication yield. Temperature sensors were fabricated on flexible substrates; utilizing amorphous silicon as the sensing material. After releasing from the rigid silicon carrier wafer, the sensors were packaged and characterized for their I-V, thermal response and 1/f noise properties. The …

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A Design And Analysis Of Computer Experiments-Based Approach To Approximate Infinite Horizon Dynamic Programming With Continuous State Spaces, Asama Kulvanitchaiyanunt Jan 2014

A Design And Analysis Of Computer Experiments-Based Approach To Approximate Infinite Horizon Dynamic Programming With Continuous State Spaces, Asama Kulvanitchaiyanunt

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Dynamic programming (DP) is an optimization approach that transforms a complex problem into a sequence of simpler sub-problems at different points in stage. The original DP approach used Bellman's equation to compute the "cost-to-go' function. This method is useful when considering a few states and decisions. However, when dealing with high-dimensional data set with continuous state space, the limit called 'curse of dimensionality' obstructs the solution as the size of the state space grows exponentially. Given recent advances in computational power, approximate dynamic programming (ADP) is introduced by not seeking to compute the future value function exactly and at each …

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A New Feature Descriptor For Lidarstrip Matching, Mythreya Jayendra Lakshman Jan 2014

A New Feature Descriptor For Lidarstrip Matching, Mythreya Jayendra Lakshman

Electrical Engineering Dissertations - Archive

Light Detection and Ranging (LiDAR) data has been getting a lot of attention these days because of its applicability in various fields - city planning, disaster response & precaution, soil conservation, infrastructure or forestry. Raw LiDAR data is not directly usable in the above-mentioned applications. Therefore, an important aspect of the aerial LIDAR system is to process raw LiDAR data accurately. The processed data is then made available to us in the form of point clouds or digital elevation maps (DEM's) or digital surface maps (DSM's). Each swath of raw data represents a single flight path over a region of …

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Inventory Pooling In Petroleum Upstream Logistics Network, Sulaiman Hamad Al Jedaie Jan 2014

Inventory Pooling In Petroleum Upstream Logistics Network, Sulaiman Hamad Al Jedaie

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The petroleum industry is heading toward the era of efficiency and cost reduction. Oilfield service companies have to raise their efficiency to stay competitive. This dissertation explores the efficiency issues facing an existing upstream petroleum logistics network, with 30 products, 30 countries and two hubs, for an international Oilfield Service Company (OSC). Inventory control was found to be a main source for inefficiency. Safety stock was studied by implementing inventory pooling concept, joint ordering, demand outliers analysis, demand bucket size analysis and regional distribution centers.Six-sigma (DMAIC) approach was used to diagnose the issues in this network and propose alternative solutions. …

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Unmanned Aerial Vehicle Routing In The Presence Of Threats, Kamil A. Alotaibi Jan 2014

Unmanned Aerial Vehicle Routing In The Presence Of Threats, Kamil A. Alotaibi

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The use of Unmanned Aerial Vehicles (UAVs) and the importance of its role have evolved and increased recently in both civilian and military operations. In this research, we study the routing of Unmanned Aerial Vehicles (UAVs) in the presence of the risk of enemy threats. The main goal for this research is to find optimal routes that consider the targets visited, expected fuel burn, threat exposure, and travel time. We formulate two mixed integer linear programs. In first formulation, we minimize the total expected fuel burn for multiple UAVs in order to visit multiple targets while maintaining the total threat …

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Design, Fabrication And Characterization Of Guided-Mode Resonance Transmission Filters, Mohammad Shyiq Amin Jan 2014

Design, Fabrication And Characterization Of Guided-Mode Resonance Transmission Filters, Mohammad Shyiq Amin

Electrical Engineering Dissertations - Archive

This dissertation addresses photonic devices enabled by the guided-mode resonance (GMR) effect. As periodic phototonic structures can become highly reflective or transmissive at resonance, this effect has been utilized to design suites of optical elements including reflection filters, transmission filters, broadband mirrors, polarizers, and absorbers with a plethora of possible deployment venues. Even though there has been considerable research on the reflection type GMR elements, attendant transmission filters have less explored experimentally, as there is material limitation to design this kind of filters with simple architecture and they also may require coupling to multiple resonances simultaneously. Apart from the design …

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An Exploration And Exploitation Pareto Approach To Surrogate Optimization, John F. Dickson Jan 2014

An Exploration And Exploitation Pareto Approach To Surrogate Optimization, John F. Dickson

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The experiments or simulations conducted by computers can be a tedious task,requiring substantial computational time. To find a global solution using a computerexperiments process, we usually need to perform many function evaluations of thecomputer model. This research focuses on developing an optimization method to find aglobally optimal solution efficiently using surrogates. The surrogates represent thecomputer model or the system that reads the inputs and generates the output responsesof interest, so that these surrogate models can be used in place of time-consumingsimulations runs. In surrogate based optimization, we iteratively build a surrogate model(a.k.a, approximate model or a metamodel) and conduct an …

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A Systems Thinking Approach To Apply Water Sustainability In Hospitals, Misagh Faezipour Jan 2014

A Systems Thinking Approach To Apply Water Sustainability In Hospitals, Misagh Faezipour

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

One of the most critical challenges the world is facing is to ensure everyone has access to an adequate and quality supply of water. As the population increases, the demand for water rises. Water needs to be sustained for current and future generations. Sustainability acts to balance the resource supply and demand. Hospitals are a major consumer of water. Unfortunately water is facing the challenges of diminishing resources and increasing demands. Therefore, considering water sustainability in hospitals is of significant importance. Water sustainability in hospitals is also important since hospitals offer services to help people improve the quality and health …

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Evaluating The Impact Of A Shared Pharmaceutical Supply Chain Model To Minimize Counterfeit Drugs, Diverted Drugs, And Drug Shortages, Jae Bong Choi Jan 2014

Evaluating The Impact Of A Shared Pharmaceutical Supply Chain Model To Minimize Counterfeit Drugs, Diverted Drugs, And Drug Shortages, Jae Bong Choi

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The pharmaceutical supply chain in the United States of America (USA) is getting complicated and is often not controllable due to a globally open market, increasing online market, and many illegal activities. Consumers who cannot afford to buy high priced genuine products are tempted by easily accessible counterfeit drugs on illegal web site pharmacies in or out of the USA. Many corrupt participants, such as wholesalers or pharmacies in the supply chain, take advantage of weak enforcement and a flawed drug supply chain for financial gain. The public health system and numerous patients are in, or could be in, painful …

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Facility Capital Equipment And Labor Decision Support System Using A Discrete-Event Simulation And Bottleneck Detection Approach, Mohammed Almansouri Jan 2014

Facility Capital Equipment And Labor Decision Support System Using A Discrete-Event Simulation And Bottleneck Detection Approach, Mohammed Almansouri

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Market demand is constantly changing. Therefore, it is critical for companies to be flexible and willing to adapt in order to remain competitive. This study will evaluate bottleneck detection techniques that have been identified in previous research by comparing the performance of each method on all case study models that can be replicated from the literature. The purpose of this analysis is to identify the most efficient and reliable bottleneck detection algorithm(s) which are capable of supporting constraint identification on a wide range of production system classes and configurations. The primary objective will be to identify a robust bottleneck detection …

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Guided-Mode Resonant Solar Cells And Flat-Top Reflectors: Analysis, Design, Fabrication And Characterization, Tanzina Khaleque Jan 2014

Guided-Mode Resonant Solar Cells And Flat-Top Reflectors: Analysis, Design, Fabrication And Characterization, Tanzina Khaleque

Electrical Engineering Dissertations - Archive

This dissertation addresses the guided-mode resonance (GMR) effect and its applications. In particular, this study presents theoretical analysis and corresponding experiments on two important GMR devices that can be broadly described as GMR-enabled thin-film solar cells and flat-top reflectors.The GMR-induced enhanced absorption of input light is observed and quantified in a fabricated nano-patterned amorphous silicon (a-Si) thin-film. Compared to a reference homogeneous thin-film of a-Si, approximately 50% integrated absorbance enhancement is achieved in the patterned structure. This result motivates the application of these resonance effects in thin-film solar cells where enhanced solar absorbance is a crucial requirement. Light trapping in …

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Towards Perfect Light Coupling And Absorption In Nanomembranes With Omni-Directional Anti-Refelction And Photonic Crystal Structures, Arvinder Chadha Jan 2014

Towards Perfect Light Coupling And Absorption In Nanomembranes With Omni-Directional Anti-Refelction And Photonic Crystal Structures, Arvinder Chadha

Electrical Engineering Dissertations - Archive

Silicon photonics is realized as a promising platform to meet the requirements of higher bandwidth and low cost high density monolithic integration. More recent demonstrations of a variety of stretchable, foldable and transfer printed ultra-thin silicon integrated circuits have instigated the use of flexible silicon nanomembrane for practical applications. Equally impressive innovations are demonstrated in the area of flat screen displays, smart cards, eyeglasses, and wearable displays. However, the overall efficiency of a variety of optical device is limited by poor light management resulting from difficulty of light coupling, small absorption volume in thin-film nanomembrane, and glare at oblique incidence …

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Hybrid And Smart Grid Wireless Networks: Capacity And Optimization, Xin Wang Jan 2014

Hybrid And Smart Grid Wireless Networks: Capacity And Optimization, Xin Wang

Electrical Engineering Dissertations - Archive

Hybrid wireless network is a combination of ad hoc network and cellular network. A key question arising in such hybrid wireless networks is what is the per-node data transmission limit of the hybrid wireless network over general fading channels and how the throughput capacity varies with different network setup. To our best knowledge, our research is the first piece of work in literature to take up this challenge. To achieve the maximum per-node throughput, an opportunistic communication strategy together with successive interference cancelation (SIC) technique is proposed in this dissertation. The scaling laws for the throughput capacity over both slow …

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Distributed Cooperative Control Of Ac Microgrids, Ali Bidram Jan 2014

Distributed Cooperative Control Of Ac Microgrids, Ali Bidram

Electrical Engineering Dissertations - Archive

In this dissertation, the comprehensive secondary control of electric power microgrids is of concern. Microgrid technical challenges are mainly realized through the hierarchical control structure, including primary, secondary, and tertiary control levels. Primary control level is locally implemented at each distributed generator (DG), while the secondary and tertiary control levels are conventionally implemented through a centralized control structure. The centralized structure requires a central controller which increases the reliability concerns by posing the single point of failure. In this dissertation, the distributed control structure using the distributed cooperative control of multi-agent systems is exploited to increase the secondary control reliability. …

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Using Advanced Metering Infrastructure Data For Smart Grid Development, Franklin L. Quilumba-Gudino Jan 2014

Using Advanced Metering Infrastructure Data For Smart Grid Development, Franklin L. Quilumba-Gudino

Electrical Engineering Dissertations - Archive

Identifying and using Advanced Metering Infrastructure (AMI) data to improve customer experience, utility operations, and advanced power management is one of the most important challenges in the smart grid development. Smart meters, capable of capturing frequent interval customer consumption (and possibly other parameters) using communication networks, are vital components of smart grid technology. Thus, smart meters expand the available range of data and functionality. Making the most of information from smart meters and smart grids increasingly requires dealing with Big Data. Big Data is a game changer, enabling utilities to transform the ways they interact with and serve their customers.Today, …

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Energy Storage Devices For Seamless Integration Of Renewable Energy, Meng Liu Jan 2014

Energy Storage Devices For Seamless Integration Of Renewable Energy, Meng Liu

Electrical Engineering Dissertations - Archive

Renewable energy, as a promising resource for supporting continuously growing electricity demand, bears the disadvantages of un-controllable variability and partial unpredictability, which present challenges for large-scale integration into power systems. To maintain stable system frequency, the mechanical energy driving the generators should be balanced with the electrical energy consumed by loads and losses at all times. However, high penetration level of renewable energy presents challenges for this basic requirement. Energy storage system (ESS) is one of the most promising solutions to shape the variable renewable generation to follow certain production plans which benefits both system operation and market participation. In …

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Home Area Networks For Smart Grid Communications, Zhuo Li Jan 2014

Home Area Networks For Smart Grid Communications, Zhuo Li

Electrical Engineering Dissertations - Archive

his dissertation studies five topic which are focused on but not limited to the area of Home Area Networks (HANs) in Smart Grid communications: capacity optimization for IR-UWB (Chapter 2), power consumption and downlink outage probability in a dynamic HAN (Chapter 3), uplink multiuser selection in a dynamic HAN (Chapter 4), capacity optimization in Heterogeneous HANs (Chapter5), hybrid models of OFDM-based power line and wireless communications for HAN security (Chapter 6), and scaling laws of ergodic capacity for hybrid wireless networks with distributed base stations (DBS) (Chapter 7). We investigate the capacity optimization of Impulse Radio (IR) UWB user within …

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Portable And Miniature Imaging System For In-Vivo Fluorescence /Luminescence Analysis, Zhaoqiang Peng Jan 2014

Portable And Miniature Imaging System For In-Vivo Fluorescence /Luminescence Analysis, Zhaoqiang Peng

Electrical Engineering Theses - Archive

For fluorescence and bioluminescence in vivo imaging systems, the current commercial product is limited by huge bulk and a constant working environment. In this thesis, we proposed and investigated a compact and portable in vivo device with similar performance as congeneric commercial products. By analyzing general requirements of each component in optical system, we dug in the principle and put forward several key parameters that should be considered for building in vivo imaging systems. Moreover, on the precondition of qualifying these parameters, and in order to build the most compact system, three design approaches have been discussed. By deliberating each …

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The Impact Of Hybrid Energy Storage On Power Quality When High Power Dc Loads Are Operated On A Microgrid Testbed, Jay Paul Kelley Jan 2014

The Impact Of Hybrid Energy Storage On Power Quality When High Power Dc Loads Are Operated On A Microgrid Testbed, Jay Paul Kelley

Electrical Engineering Theses - Archive

As the Navy's demands for high power transient loads evolves, so too does the need for alternative energy sources to back-up the more traditional power generation. Such applications in need of support include electrical grid backup and directed energy weapon systems such as electromagnetic launchers, laser systems, and high power microwave generators, among others. Among the alternative generation sources receiving considerable attention are energy storage devices such as rechargeable electrochemical batteries and capacitors. In such applications as those mentioned above, these energy storage devices offer the ability to serve a dual role as both a power source to the various …

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Using Aerial Range Feature Descriptor (Arfd) For Lidar Strip Adjustment And Mosaicing, Yanyan Hu Jan 2014

Using Aerial Range Feature Descriptor (Arfd) For Lidar Strip Adjustment And Mosaicing, Yanyan Hu

Electrical Engineering Theses - Archive

Light Detection and Ranging (LiDAR) has become the primary surface data extraction mapping technique nowadays. Airborne LiDAR system consists of three major components, which are laser ranging and scanning unit, Global Position System (GPS) and Inertia Measurement Unit (IMU). LiDAR data are collected in a rectangular strip-wise pattern with 10% - 30% overlapping ratio between adjacent strips. When the calibration parameters within the system components are not accurately determined, systematic errors might occur within LiDAR strips. The systematic errors lead to strip discrepancies, which will further affect the quality of end-user products like Digital Elevation Map (DEM) or Digital Surface …

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Complexity Reduction In Inter Layer Inter Prediction In Scalable High Efficiency Video Coding, Karuna Gubbi Shivashankar Sastri Jan 2014

Complexity Reduction In Inter Layer Inter Prediction In Scalable High Efficiency Video Coding, Karuna Gubbi Shivashankar Sastri

Electrical Engineering Theses - Archive

In scalable extension of HEVC, the base layer is coded using normal HEVC codec and the enhancement layers are coded using interlayer prediction for both intra and inter predictions. The prediction process for the enhancement layer in scalable video coding is complex and the proposed algorithm in the thesis concentrates mainly on reducing the complexity of the inter-layer inter prediction to code the enhancement layer.

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Membrane Transfer Of Crystalline Silicon Solar Cells, Venkata Kesari Nandan Vempati Jan 2014

Membrane Transfer Of Crystalline Silicon Solar Cells, Venkata Kesari Nandan Vempati

Electrical Engineering Theses - Archive

Silicon has been dominating the solar industry for many years and has been touted as the gold standard of the photovoltaic world. The factors for its dominance: government subsidies and ease of processing. Silicon holds close to 90% of the market share in the material being used for solar cell production. Of which 14% belongs to single-crystalline Silicon. Although 24% efficient bulk crystalline solar cells have been reported, the industry has been looking for thin film alternatives to reduce the cost of production. Moreover with the new avenues like flexible consumer electronics opening up, there is a need to introduce …

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