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Articles 1921 - 1950 of 4180
Full-Text Articles in Engineering
Microwave Radiometer (Mwr) Evaluation Of Multi-Beam Satellite Antenna Boresight Pointing Using Land-Water Crossings, For The Aquarius/Sac-D Mission, Bradley Clymer
Electronic Theses and Dissertations
This research concerns the CONAE Microwave Radiometer (MWR), on board the Aquarius/SAC-D platform. MWR's main purpose is to provide measurements that are simultaneous and spatially collocated with those of NASA's Aquarius radiometer/scatterometer. For this reason, knowledge of the MWR antenna beam footprint geolocation is crucial to mission success. In particular, this thesis addresses an on-orbit validation of the MWR antenna beam pointing, using calculated MWR instantaneous field of view (IFOV) centers, provided in the CONAE L-1B science data product. This procedure compares L-1B MWR IFOV centers at land/water crossings against high-resolution coastline maps. MWR IFOV locations versus time are computed …
Reactive Sputter Deposition Of Lithium Phosphorus Oxynitride Thin Films, A Li Battery Solid State Electrolyte, Prabhu Doss Mani
Reactive Sputter Deposition Of Lithium Phosphorus Oxynitride Thin Films, A Li Battery Solid State Electrolyte, Prabhu Doss Mani
Electronic Theses and Dissertations
Lithium phosphorus oxy-nitride (LiPON) thin films are widely studied and used as a thin film electrolyte for lithium ion battery applications. LiPON thin films may be prepared by many techniques, but RF sputter deposition is most frequently used and was investigated in this dissertation, in spite of its low deposition rate, because of it offers more reliable and controllable processing. This dissertation includes the methodologies of sputter deposition and materials characterization of the LiPON thin film electrolytes. The LiPON thin films were deposited under varying conditions of process gas, substrate bias, and deposition temperature. To understand the variations in ionic …
Improving Fairness, Throughput And Blocking Performance For Long Haul And Short Reach Optical Networks, Sana Tariq
Improving Fairness, Throughput And Blocking Performance For Long Haul And Short Reach Optical Networks, Sana Tariq
Electronic Theses and Dissertations
Innovations in optical communication are expected to transform the landscape of global communications, internet and datacenter networks. This dissertation investigates several important issues in optical communication such as fairness, throughput, blocking probability and differentiated quality of service (QoS). Novel algorithms and new approaches have been presented to improve the performance of optical circuit switching (OCS) and optical burst switching (OBS) for long haul, and datacenter networks. Extensive simulations tests have been conducted to evaluate the effectiveness of the proposed algorithms. These simulation tests were performed over a number of network topologies such as ring, mesh and U.S. Long-Haul, some high …
Streamlining The Acquisition Process: Systems Analysis For Improving Army Acquisition Corps Officer Management, Shawn Chu-Quinn
Streamlining The Acquisition Process: Systems Analysis For Improving Army Acquisition Corps Officer Management, Shawn Chu-Quinn
Electronic Theses and Dissertations
The Army Acquisition Officer lacks proficient experience needed to fill key leadership positions within the Acquisition Corps. The active duty Army officer is considered for the Acquisition Corps functional area between their 5th and 9th years of service as an officer – after completing initial career milestones. The new Acquisition Corps officer is the rank of senior Captain or Major when he arrives to his first acquisition assignment with a proficiency level of novice (in acquisition). The Army officer may be advanced in his primary career branch, but his level decreases when he is assigned into the Acquisition Corps functional …
A Framework For Interoperability On The United States Electric Grid Infrastructure, Stuart Laval
A Framework For Interoperability On The United States Electric Grid Infrastructure, Stuart Laval
Electronic Theses and Dissertations
Historically, the United States (US) electric grid has been a stable one-way power delivery infrastructure that supplies centrally-generated electricity to its predictably consuming demand. However, the US electric grid is now undergoing a huge transformation from a simple and static system to a complex and dynamic network, which is starting to interconnect intermittent distributed energy resources (DERs), portable electric vehicles (EVs), and load-altering home automation devices, that create bidirectional power flow or stochastic load behavior. In order for this grid of the future to effectively embrace the high penetration of these disruptive and fast-responding digital technologies without compromising its safety, …
Body Mass Bias Mitigation For Females In Military Physical Readiness Testing Through Load Carriage Implementation, Aaron Yeaton
Body Mass Bias Mitigation For Females In Military Physical Readiness Testing Through Load Carriage Implementation, Aaron Yeaton
Electronic Theses and Dissertations
The US Military requires specific fitness testing, known as the Physical Readiness Test (PRT), for its members to determine their overall fitness levels. The test currently being used has been shown to have bias towards heavier mass individuals of up to 20%. Prior research has been completed and several recommendations have been made to eliminate mass bias, but this has been conducted almost exclusively on males. There is very little data and research on military physical fitness testing for women besides combat specific evolution exercises. A possibility exists to eliminate the bias for females through implementing load carriage during PRT …
The Effects Of Chronic Sleep Deprivation On Sustained Attention: A Study Of Brain Dynamic Functional Connectivity, Yiling He
Electronic Theses and Dissertations
It is estimated that about 35-40% of adults in the U.S. suffer from insufficient sleep. Chronic sleep deprivation has become a prevalent phenomenon because of contemporary lifestyle and work-related factors. Sleep deprivation can reduce the capabilities and efficiency of attentional performance by impairing perception, increasing effort to maintain concentration, as well as introducing vision disturbance. Thus, it is important to understand the neural mechanisms behind how chronic sleep deprivation impairs sustained attention. In recent years, more attention has been paid to the study of the integration between anatomically distributed and functionally connected brain regions. Functional connectivity has been widely used …
Evaluation Of Strength And Hydraulic Properties Of Buried Pipe Systems Used For Stormwater Harvesting, Mario Samson Mena
Evaluation Of Strength And Hydraulic Properties Of Buried Pipe Systems Used For Stormwater Harvesting, Mario Samson Mena
Electronic Theses and Dissertations
Water scarcity has been identified as a global issue. Both water harvesting and an efficient water piping system are some of the important factors to meet the water demand. In this study, high-density polyethylene (HDPE) pipes used as an underground storage was evaluated and a Microsoft EXCEL based model was developed, called PIPE-R Model. To study the structural integrity of the pipes, laboratory and field testing were conducted. For the water harvesting, UCF Stormwater Management Academy designed an EXCEL based model to simulate the system's performance to store and redistribute water for an average year. The purpose of PIPE-R Model …
Band To Band Calibration And Relative Gain Analysis Of Satellite Sensors Using Deep Convective Clouds, Suman Bhatta
Band To Band Calibration And Relative Gain Analysis Of Satellite Sensors Using Deep Convective Clouds, Suman Bhatta
Electronic Theses and Dissertations
Two calibration techniques were developed in this research. First, a calibration technique, in which calibration was transferred to cirrus band and coastal aerosol band from well calibrated reflective bands of Landsat 8 using SCIAMACHY Deep Convective Cloud (DCC) spectra. Second, a novel method to derive relative gains using DCCs and improve the image quality of cirrus band scenes was developed. DCCs are very cold, bright clouds located in the tropopause layer. At small sun elevation and sensor viewing angles, they act as near Lambertian solar reflectors. They have very high signal to noise ratio and can easily be detected using …
Modeling The Impact Of Future Climate On Drainage Infrastructures, Tyler J. Baumbach
Modeling The Impact Of Future Climate On Drainage Infrastructures, Tyler J. Baumbach
Electronic Theses and Dissertations
Research has shown a potential 20% increase in future heavy and extreme precipitation events over the Midwestern States. Drainage infrastructures designed using current design conditions may not be able to convey projected runoffs resulting in flooding and damage to infrastructure. The objective of this paper is to determine the effects of future climate variability on culvert selections in a southwest South Dakota watershed. The scope of the study was defined through a comprehensive literature review. Future climate events were based on a 20% increase in current annual precipitation over the Upper White River Subbasin Watershed. A portion of the White …
Dynamic Response Of Glass Under Low-Velocity Impact And High Strain-Rate Compression Loading, Seyed Soheil Daryadel
Dynamic Response Of Glass Under Low-Velocity Impact And High Strain-Rate Compression Loading, Seyed Soheil Daryadel
Electronic Theses and Dissertations
In this research, the dynamic response and energy absorption characteristics of four different types of commercially available glass have been investigated experimentally. Soda Lime, Starphire, Borosilicate, and Fused Silica were characterized using a Dynatup 8250 drop weight impact test system, and a modified Split Hopkinson Pressure Bar (SHPB). In the low-velocity punch-shear experiment, similar trend has been observed for all glass types, and Starphire and Borosilicate demonstrated the highest total energy absorption. High strain-rate SHPB compression tests were carried out on cylindrical glass samples at two different strain-rates. Borosilicate shohigher compressive strength and energy absorption in comparison to the other …
A Process-Based Nutrient Model For The Bedded Manure Pack Of Confined Beef Systems, Ferouz Y. Ayadi
A Process-Based Nutrient Model For The Bedded Manure Pack Of Confined Beef Systems, Ferouz Y. Ayadi
Electronic Theses and Dissertations
Manure management is of growing concern for beef cattle producers and the general public. The overall objective of this research was to develop a process-based model that predicts concentration and gaseous emission from the bedded manure pack of a confined beef cattle system, with respect to different bedding material, manure storage time, and ambient temperature. The model incorporated the data collected in three experiments designed to understand transformations and processes occurring in the bedded pack. The first study evaluated the source of volatilized ammonia nitrogen from beef cattle manure. Isotope ratio mass spectrometry was used to determine the origin of …
Studies Related To Microbially Induced Corrosion Of Stainless Steel 304 And 316, Somil Gupta
Studies Related To Microbially Induced Corrosion Of Stainless Steel 304 And 316, Somil Gupta
Electronic Theses and Dissertations
Pitting corrosion of stainless steel (SS) is observed in many different industries including the dairy industry. It is of concern, because it weakens the steel, and can cause cracking. Any replacement or repair of SS equipment is very costly and also causes delays in product manufacture. Microbial Induced Corrosion (MIC) is a possible accelerator of natural corrosion seen in galvanized steel pipes. Studies have shown a correlation between surface roughness and the ability of bacteria to colonize and form biofilms. Dairy industry utilizes higher food grade SS 304 and 316. However, even these relatively corrosion resistant stainless steel grades may …
Temperature Dependence Of Shear Speed In Micellar Fluid, E.G. Sunethra Kumari Dayavansha
Temperature Dependence Of Shear Speed In Micellar Fluid, E.G. Sunethra Kumari Dayavansha
Electronic Theses and Dissertations
Wormlike micellar (WM) fluids are viscoelastic and can support shear waves. Phase transitions of the micellar aggregates are temperature dependent and can manifest as sharp changes in the shear wave speed as a function of temperature. Thus, shear waves provide a good tool for detecting the existence of phase transitions. In this work, the variation of shear speed with temperature of 200mM CTAB/NaSal micellar fluid in a 5:3 ratio was studied. The dependence of shear wave speed on time between fluid synthesis and measurement was also investigated. Shear wave propagation through the fluid was observed as a time varying birefringence …
Analysis Of Pervious Concrete As A Stormwater Management Tool Using Swmm Modeling, Liya Eshetu Abera
Analysis Of Pervious Concrete As A Stormwater Management Tool Using Swmm Modeling, Liya Eshetu Abera
Electronic Theses and Dissertations
Stormwater runoff occurs when precipitation flows over the ground. Increase in impervious land cover due to urbanization causes excess stormwater runoff and affects the quantity and quality of water bodies. The use of low impact development (lid) controls is highly recommended to reduce the excess volume of stormwater runoff. Lid controls include infiltration techniques such as pervious pavements, evaporation, and storage techniques to reduce the volume of runoff. In this study, an analysis is done for the performance of pervious concrete pavement located at the University of Mississippi Law School parking area. The law school was constructed in 2010 and …
Economic Viability And Societal Benefits Of Integrated Multimodal Freight Corridors And Sustainable Passenger Transportation, Seth Austin Cobb
Economic Viability And Societal Benefits Of Integrated Multimodal Freight Corridors And Sustainable Passenger Transportation, Seth Austin Cobb
Electronic Theses and Dissertations
No abstract provided.
Elliptical Metasurfaces For Cloaking And Antenna Applications At Microwave And Terahertz Frequencies, Hossein Mehrpourbernety
Elliptical Metasurfaces For Cloaking And Antenna Applications At Microwave And Terahertz Frequencies, Hossein Mehrpourbernety
Electronic Theses and Dissertations
No abstract provided.
Divergence And Bayes Error Based Soft Decision For Decentralized Signal Detection Of Correlated Sensor Data, Roopa Shree Rajanna
Divergence And Bayes Error Based Soft Decision For Decentralized Signal Detection Of Correlated Sensor Data, Roopa Shree Rajanna
Electronic Theses and Dissertations
No abstract provided.
Pathogen Indicator Monitoring In The Ross Barnett Reservoir, Hannie Quay Parker Capps
Pathogen Indicator Monitoring In The Ross Barnett Reservoir, Hannie Quay Parker Capps
Electronic Theses and Dissertations
Man-made reservoirs are often used for both water supply and recreation. The Ross Barnett Reservoir in central Mississippi, a 33,000-acre man-made lake, provides drinking water to the city of Jackson, MS, and forty-eight surrounding communities. Further, an estimated 2.5 million people visit the Reservoir each year for recreational purposes, including boating, fishing, water-skiing, and swimming. Protecting the water quality in the Reservoir is important for these visitors and inhabitants along the shoreline, and for these reasons, the U.S. Environmental Protection Agency has selected it as a Priority Watershed in Mississippi. Presently, there is a concern regarding recent data collected that …
Raptorq-Based Multihop File Broadcast Protocol, Roya Lotfi
Raptorq-Based Multihop File Broadcast Protocol, Roya Lotfi
Electronic Theses and Dissertations
The objective of this thesis is to describe and implement a RaptorQ broadcast protocol application layer designed for use in a wireless multihop network. The RaptorQ broadcast protocol is a novel application layer broadcast protocol based on RaptorQ forward error correction. This protocol can deliver a file reliably to a large number of nodes in a wireless multihop network even if the links have high loss rates. We use mixed integer programming with power balance constraints to construct broadcast trees that are suitable for implementing the RaptorQ-based broadcast protocol. The resulting broadcast tree facilitates deployment of mechanisms for verifying successful …
Experimental Validation Of Metasurface Cloak For Dielectric Cylinder At Mircowave Frequencies, Corey Isaac Garner
Experimental Validation Of Metasurface Cloak For Dielectric Cylinder At Mircowave Frequencies, Corey Isaac Garner
Electronic Theses and Dissertations
No abstract provided.
Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging, Seyedali Forouzmand
Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging, Seyedali Forouzmand
Electronic Theses and Dissertations
Graphene is a two-dimensional carbon crystal that became one of the most controversial topics of research in the last few years. The intense interest in graphene stems from recent demonstrations of their potentially revolutionary electromagnetic applications – including negative refraction, subdiffraction imaging, and even invisibility – which have suggested a wide range of new devices for communications, sensing, and biomedicine. In addition, it has been shown that graphene is amenable to unique patterning schemes such as cutting, bending, folding, and fusion that are predicted to lead to interesting properties. A recent proposed application of graphene is in engineering the scattering …
Localization Of Sensors In Presence Of Fading And Mobility, Hamzeh Hussain Omari
Localization Of Sensors In Presence Of Fading And Mobility, Hamzeh Hussain Omari
Electronic Theses and Dissertations
The objective of this dissertation is to estimate the location of a sensor through analysis of signal strengths of messages received from a collection of mobile anchors. In particular, a sensor node determines its location from distance measurements to mobile anchors of known locations. We take into account the uncertainty and fluctuation of the RSS as a result of fading and take into account the decay of the RSS which is proportional to the transmitter-receiver distance power raised to the PLE. The objective is to characterize the channel in order to derive accurate distance estimates from RSS measurements and then …
Synthetic Materials With Redox-Triggers For Imaging And Drug Delivery, Jungeun Bae
Synthetic Materials With Redox-Triggers For Imaging And Drug Delivery, Jungeun Bae
Electronic Theses and Dissertations
Synthetic materials embedded with stimuli-responsive cleavable bonds have been extensively utilized for the development of site-targeted drug delivery system and selective imaging reporters. We developed stimuli-sensitive materials with two different redox switches including trimethyl-locked quinone propionic acid and nitrobenzyl moieties. Novel redox-sensitive polymeric nanoparticles and micelles were prepared from a synthesized monomer containing trimethyl-locked quinone propionic acid as a redox trigger. A hydrophobic cancer drug, Paclitaxel, was incorporated into the redox-responsive polymeric nanoparticles and micelles prepared from the synthesize polymers. The effect of redox stress on the nanoparticles and micelles was evaluated with a chemical reductant, sodium dithionite demonstrating that …
Performance Evaluation Of Tcp Multihoming For Ipv6 Anycast Networks And Proxy Placement, Raya Alsharfa
Performance Evaluation Of Tcp Multihoming For Ipv6 Anycast Networks And Proxy Placement, Raya Alsharfa
Electronic Theses and Dissertations
In this thesis, the impact of multihomed clients and multihomed proxy servers on the performance of modern networks is investigated. The network model used in our investigation integrates three main components: the new one-to-any Anycast communication paradigm that facilitates server replication, the next generation Internet Protocol Version 6 (IPv6) that offers larger address space for packet switched networks, and the emerging multihoming trend of connecting devices and smart phones to more than one Internet service provider thereby acquiring more than one IP address. The design of a previously proposed Proxy IP Anycast service is modified to integrate user device multihoming …
Nanoscale Control Of Gap-Plasmon Enhanced Optical Processes, Chatdanai Lumdee
Nanoscale Control Of Gap-Plasmon Enhanced Optical Processes, Chatdanai Lumdee
Electronic Theses and Dissertations
Surface plasmon resonances of metal nanostructures have been studied intensely in recent years. The strong plasmon-mediated electric field enhancement and field confinement well beyond the diffraction limit has been demonstrated to improve the performance of optical devices including ultrasensitive sensors, light emitters, and optical absorbers. A plasmon resonance mode of particular recent interest is the gap plasmon resonance that occurs on closely spaced metallic structures. In contrast to plasmon resonances supported by isolated metal nanostructures, coupled nanostructures provide additional spectral and spatial control over the plasmon resonance response. For example, the resonance frequencies of metal nanoparticle dimers depend strongly on …
Optical Propagation Of Self-Sustaining Wavefronts And Nonlinear Dynamics In Parabolic Multimode Fibers, Matthew Mills
Optical Propagation Of Self-Sustaining Wavefronts And Nonlinear Dynamics In Parabolic Multimode Fibers, Matthew Mills
Electronic Theses and Dissertations
The aim of this thesis is to introduce my work which has generally been focused on optical wavefronts that have the unusual property of resisting commonplace phenomena such as diffraction and dispersion. Interestingly, these special beams are found both in linear and nonlinear situations. For example, in the linear regime, localized spatio-temporal waves which resemble the spherical harmonic symmetries of the hydrogen quantum orbitals can simultaneously negotiate both diffractive and dispersive effects. In the nonlinear regime, dressed optical filaments can be arranged to propagate multi-photon produced plasma channels orders of magnitude longer than expected. The first portion of this dissertation …
Zrb2-Sic Based Ultra High Temperature Ceramic Composites: Mechanical Performance And Measurement And Design Of Thermal Residual Stresses For Hypersonic Vehicle Applications, Richard Stadelmann
Zrb2-Sic Based Ultra High Temperature Ceramic Composites: Mechanical Performance And Measurement And Design Of Thermal Residual Stresses For Hypersonic Vehicle Applications, Richard Stadelmann
Electronic Theses and Dissertations
Ultra-high temperature ceramics (UHTCs), such as ZrB2-based ceramic composites, have been identified as next generation candidate materials for leading edges and nose cones in hypersonic air breathing vehicles. Mechanical performance of ceramic composites play an important role in the ultra-high temperature applications, therefore SiC is added to ZrB2 as a strengthening phase to enhance its mechanical performance. The high melting temperatures of both ZrB2 and SiC, as well as the ability of SiC to form SiO2 refractory oxide layers upon oxidation make ZrB2-SiC ceramics very suitable for aerospace applications. Thermal residual stresses appearing during processing are unavoidable in sintered ZrB2-SiC …
Towards High-Flux Isolated Attosecond Pulses With A 200 Tw Cpa, Eric Cunningham
Towards High-Flux Isolated Attosecond Pulses With A 200 Tw Cpa, Eric Cunningham
Electronic Theses and Dissertations
Attosecond pulses have been developed as a means for investigating phenomena that proceed on the order of the atomic unit of time (24 as). Unfortunately, these extreme ultraviolet (XUV) pulses by themselves contain too few photons to initiate nonlinear dynamics or dress states in an attosecond pump--attosecond probe scheme. As a result, most attosecond experiments thus far have featured complementary near infrared (NIR) femtosecond lasers for instigating electron dynamics. In order to access the benefits of all-attosecond measurements and open attosecond physics to new fields of exploration, the photon flux of these pulses must be increased. One way to boost …
Experimental And Numerical Study Of Endwall Film Cooling, Srikrishna Mahadevan
Experimental And Numerical Study Of Endwall Film Cooling, Srikrishna Mahadevan
Electronic Theses and Dissertations
This research work investigates the thermal performance of a film-cooled gas turbine endwall under two different mainstream flow conditions. In the first part of the research investigation, the effect of unsteady passing wakes on a film-cooled pitchwise-curved surface (representing an endwall without airfoils) was experimentally studied for heat transfer characteristics on a time-averaged basis. The temperature sensitive paint technique was used to obtain the local temperatures on the test surface. The required heat flux input was provided using foil heaters. Discrete film injection was implemented on the test surface using cylindrical holes with a streamwise inclination angle of 35? and …