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Articles 1 - 18 of 18
Full-Text Articles in Engineering
Simulation Of A Rapid Compression Machine For Evaluation Of Ignition Chemistry And Soot Formation Using Gasoline/Ethanol Blends, Musharrat Chowdhury
Simulation Of A Rapid Compression Machine For Evaluation Of Ignition Chemistry And Soot Formation Using Gasoline/Ethanol Blends, Musharrat Chowdhury
Master's Theses (2009 -)
With the projected decline of demand for gasoline in light duty engines and the advent of ethanol as a green fuel, the use of gasoline-ethanol blend fuels in heavy duty applications are being investigated where the primary mode of combustion is mixing controlled combustion. In mixing controlled combustion, a wide range of mixture conditions (equivalence ratio) exist inside the engine cylinder. The sooting tendencies of light fuels at richer conditions are not well understood. The goal of this research is to model the particulate matter emissions for gasoline/ethanol fuel blends, especially at fuel rich conditions. The computational models can then …
Development Of An In Vitro Model To Assess Endothelial Dysfunction From Coarctation Of The Aorta, Dylan James Schock
Development Of An In Vitro Model To Assess Endothelial Dysfunction From Coarctation Of The Aorta, Dylan James Schock
Master's Theses (2009 -)
Coarctation of the aorta (CoA) is a common congenital heart defect characterized by a stenosis of the descending thoracic aorta. Surgical treatment can alleviate the stenosis and restore physiologic blood flow; however, patients frequently develop cardiovascular morbidity with hypertension (HTN) being most common. Identifying the mechanisms involved with the onset of HTN in CoA patients is difficult due to confounding factors including the severity of coarctation, age of correction, and general lifestyle factors. To account for the variability seen in humans, a rabbit model of CoA and correction was developed previously. Microarray analysis of aortic samples from the model showed …
Impact Of Pipe Material On Microbial Communities In Biofilm Samples From Full-Scale Drinking Water Distribution Systems, San Marie Victoria Thomson
Impact Of Pipe Material On Microbial Communities In Biofilm Samples From Full-Scale Drinking Water Distribution Systems, San Marie Victoria Thomson
Master's Theses (2009 -)
The drinking water distribution system (DWDS) provides a habitat particularly supportive to biofilm-forming bacteria that can attach to pipe walls. These biofilms comprise the majority of bacteria in the DWDS, yet they have been understudied with respect to the pipe material on which they form. Biofilms can accelerate disinfectant decay, promote corrosion of pipes, and harbor opportunistic pathogens (OPs). The choice of pipe material could have a long-lasting effect on the characteristics of the biofilms formed in DWDSs. In this study, the impact of pipe material on biofilms residing in full-scale drinking water pipes was investigated by obtaining biofilm samples …
Near Infrared Light Penetration In Human Tissue: An Analysis Of Tissue Structure And Heterogeneities, Paul Murray Koster
Near Infrared Light Penetration In Human Tissue: An Analysis Of Tissue Structure And Heterogeneities, Paul Murray Koster
Master's Theses (2009 -)
Low level laser irradiation (LLLI) has been a controversial method of therapy due to a limited understanding of the underlying mechanisms that could cause the irradiation to provide its proposed benefits – increased blood flow, vasodilation, cell attachment, and wound healing. Near infrared (NIR) light appears able to function with nitrates and enzymes around the electric transport chain to allow biologically available nitric oxide to be released from hemoglobin and myoglobin. Nitric oxide has been shown to be a part of a mechanism that promotes blood flow, vasodilation, and wound healing.NIR penetration in biological tissue is not well described due …
Comparison Of 3d Bio-Printed Ipsc-Cms Derived From Healthy Donors And Patients With Hlhs, Wei He
Comparison Of 3d Bio-Printed Ipsc-Cms Derived From Healthy Donors And Patients With Hlhs, Wei He
Master's Theses (2009 -)
Hypoplastic left heart syndrome (HLHS) is an extremely severe form of congenital heart disease, but current treatments are not adequate. In order to find more effective treatments, we need to reproduce in vitro the physiological characteristics of cardiomyocytes associated with HLHS. Such a tissue model could be of great help to current medical research, and 3D printing technology is an effective tool for this purpose. We print layer-by-layer cardiomyocytes from both healthy and HLHS patients with laminin-based bioink to form a three-dimensional model. With our 3D cell culture technology, this model can simulate the growth conditions of cardiomyocytes in vivo. …
Deep Learning-Based Prediction Of Ppb-Level Metal Ions In Drinking Water With Explainable Ai, Shaokun Yu
Deep Learning-Based Prediction Of Ppb-Level Metal Ions In Drinking Water With Explainable Ai, Shaokun Yu
Master's Theses (2009 -)
In the research on detecting different ppb-level metal ions in drinking water in multiple areas. Through the block loop gap resonator (BLGR), this kind of metal ion sensor can continuously measure the concentrations of different metal ions in the water sample. The BLGR can classify different ions and measure the Cu and Pb ions in different ppb-level water in the city. According to the different magnitude and phases in continuous frequency in the testing. A better model can be trained by using deep learning, the convolution neural network. A neural network is often regarded as a black-box model because its …
A Design Process Leveraging Potential Energy In Planar Multistable Mechanisms, Edward Dold
A Design Process Leveraging Potential Energy In Planar Multistable Mechanisms, Edward Dold
Master's Theses (2009 -)
Planar multistable mechanisms are used throughout engineering to accomplish various tasks, for example residential electrical switching. The design of planar multistable mechanisms can be broken into four areas: determination of topology, geometric parameterization, analysis, and optimization. While topological determination, many analysis techniques, and optimization are well developed, geometric parameterization, which includes defining link lengths and spring stiffness, has largely been left to engineering judgement. This thesis presents a design methodology using potential energy graphs which informs engineering decisions made in choosing mechanism parameters for planar multistable mechanisms, giving designers higher confidence in the design. A kinematic analysis coupled with Lagrange's …
Improving The Hardware Security Of Unmanned Aerial Vehicles Against Side Channel Analysis Using Motor Noise, Timothy Radtke
Improving The Hardware Security Of Unmanned Aerial Vehicles Against Side Channel Analysis Using Motor Noise, Timothy Radtke
Master's Theses (2009 -)
This thesis investigates the efficacy of side channel analysis based attacks to recover the encryption key of unmanned aerial vehicles (UAV) which have become increasingly important internet of things devices in both the public and military sectors. Additionally, this thesis proposes a method based on noise injection to safeguard against side channel analysis based attacks. The proposed method is unique because it is ultra-low power and uses as a noise source the brushless motors of the unmanned aerial vehicle. Verification through experimentation on an in-house build UAV system is presented. Firstly, side channel analysis techniques are overviewed and the correlation …
Device Location-Based Link Layer Scheduling For Large-Scale Dense Industrial Iot Networks, Ahmed Ajeena
Device Location-Based Link Layer Scheduling For Large-Scale Dense Industrial Iot Networks, Ahmed Ajeena
Master's Theses (2009 -)
A medium access control (MAC) protocol design is proposed in this paper for the industrial internet of things (IIoT) networks with massive connections. Considering a non-fully connected network with multiple access points (APs), we aim to connect a large number of IIoT devices densely populating the network coverage area, achieve low latency, and avoid collisions. To achieve this objective, we adopt a time-slotted carrier sensing-based medium access control design and propose a device location-based time slot assignment scheme for channel access scheduling. The proposed scheme assigns devices to time slots based on their locations to eliminate collisions caused by hidden …
Seismic Performance Comparison Of Ordinary Concentrically Braced Frames In The Western And Central United States, Matthew Waters
Seismic Performance Comparison Of Ordinary Concentrically Braced Frames In The Western And Central United States, Matthew Waters
Master's Theses (2009 -)
Ordinary concentrically braced frames (OCBFs) are intended to be moderately ductile steel seismic-force-resisting systems and are permitted in low-rise buildings in regions with high seismic hazards. There has been relatively little research to quantify the seismic performance of OCBFs, with most of the previous work emphasizing the role of reserve capacity on performance. To improve the understanding of seismic performance and validate current design provisions, a series of nonlinear response-history analyses were conducted. Two, three-story OCBF study buildings were designed in accordance with ASCE/SEI 7-16 for sites in Seattle, WA and Memphis, TN; the sites have relatively high seismic hazards …
Activated Sludge Foaming Descriptors And Correlation To Microbial Community Composition, Grace K. Scarim
Activated Sludge Foaming Descriptors And Correlation To Microbial Community Composition, Grace K. Scarim
Master's Theses (2009 -)
Activated sludge is a conventional treatment process for biochemical oxygen demand (BOD) and total suspended solids (TSS) removal at water resource recovery facilities (WRRFs). A common operational issue that arises is activated sludge foaming on top of the aeration basin and secondary clarifier. Foaming events in activated sludge may lead to decreased treatment efficiency, maintenance issues, and potential environmental health risks. Stable foaming events are caused by biological and chemical drivers (i.e., microbes and surfactants) during the aeration process. However, foaming events are difficult to predict and quantify. This research developed an inexpensive and easy-to-use method to quantify foaming potential …
Uv Light Emitting Diodes (Led) For Degradation Of Antibiotic Resistant Bacteria And Genes, Nicole Anne Heyniger
Uv Light Emitting Diodes (Led) For Degradation Of Antibiotic Resistant Bacteria And Genes, Nicole Anne Heyniger
Master's Theses (2009 -)
The presence of antibiotic resistant bacteria (ARB) and antibiotic resistant genes (ARGs) in the environment is a growing issue, which been exacerbated by the overuse and misuse of antibiotics in various healthcare and agricultural systems. One possible means of antibiotic resistance mitigation is through drinking water and wastewater treatment, specifically disinfection processes. Ultraviolet light emitting diodes (UV-LEDs) are an emerging disinfection technology that utilize LEDs that emit at varying peak wavelengths in the UV light spectrum. This study analyzed the effect of UV-LED on ARB and ARGs compared to conventional low-pressure UV (LP-UV) treatment and calculated electrical energy efficiencies for …
Monitoring The Hydrologic And Water Quality Performance Of A Subsurface Gravel Wetland, Catherine Sullivan
Monitoring The Hydrologic And Water Quality Performance Of A Subsurface Gravel Wetland, Catherine Sullivan
Master's Theses (2009 -)
Managing stormwater is a crucial task for many communities that are required to mitigate the harmful effects of pollution from urban runoff. Subsurface gravel wetlands are an emerging type of green infrastructure that can be used to manage stormwater through the capture and slow release of runoff. These wetland systems are unique to other types of green infrastructure in that they have a distinct fully saturated gravel layer below an occasionally saturated soil layer. While there is substantial literature on the performance of different types of green infrastructure, such as bioretention, bioswales, and permeable pavements, there is a lack of …
Wet Detention Pond Phosphorus Cycling Dynamics: Evaluation Of Pond Performance And Application Of The General Lake Model, Caitlin Lulay
Wet Detention Pond Phosphorus Cycling Dynamics: Evaluation Of Pond Performance And Application Of The General Lake Model, Caitlin Lulay
Master's Theses (2009 -)
Anthropogenic activities degrade surface water quality by increasing nutrient input to the watershed which is transported via stormwater runoff and accumulated in waterbodies leading to eutrophication. Wet detention ponds are a means of mitigating the impacts of these non-point source pollutants, such as phosphorus (P), through treatment mechanisms such as sediment settling and biological uptake. While these wet detention ponds are designed to serve as P sinks, they have the potential to serve as P sources as well due to release mechanisms such as sediment resuspension and algal decay. Many existing models used in the design and performance evaluation of …
Numerical Studies Of A Superelastic Nickel-Titanium Rhombic Dodecahedron Structure Using The Finite Element Method, Ian Patrick Morrissey
Numerical Studies Of A Superelastic Nickel-Titanium Rhombic Dodecahedron Structure Using The Finite Element Method, Ian Patrick Morrissey
Master's Theses (2009 -)
Energy dissipation is an important material property for materials used inapplications such as armor, airplane wings, and automotive vehicle crumple zones. superelastic Nickel-Titanium (NiTi) and compliant under-dense materials both have excellent energy dissipation properties. Current research suggests that compliant underdense materials made of superelastic NiTi have desirable energy dissipation properties. A rhombic dodecahedron Lattice Structured Material (LSM) is an example of a compliant under-dense Material which has potential to exhibit desirable energy dissipation properties when manufactured from superelastic NiTi. In this work, finite element modeling of a superelastic NiTi rhombic dodecahedron Lattice Structured Material is performed and an optimum for …
Environmental Effects On Self-Luminous Gfrps, Michael Charles Phelan
Environmental Effects On Self-Luminous Gfrps, Michael Charles Phelan
Master's Theses (2009 -)
By implanting luminous powder into GFRPs, the material’s luminous capabilities coupled with its high strength to weight ratio create a structural component doubling as a sustainable light source. In this research, the luminous and mechanical properties of self-luminous GFRPs subjected to various environmental stimuli are studied to understand how their afterglow and mechanical properties are affected by weather and differing luminous powder concentrations. To simulate the conditions a GFRP will face during its lifetime, the material was studied after exposure to UV radiation, freezing and hot temperatures, and submersion under tap water. This study also analyzes how the luminous and …
Barriers To Utilization Of Fare-Free Transit By Students, Danielle Eden Del Conte
Barriers To Utilization Of Fare-Free Transit By Students, Danielle Eden Del Conte
Master's Theses (2009 -)
Marquette University has participated in Milwaukee County Transit System's (MCTS) U-PASS program since 1995. The program provides fare-free access to buses for students via an unlimited pass paid for by a $50 per semester fee. Marquette University pays MCTS a lump sum each year, heavily discounting the cost-per-ride for students if they were to pay out-of-pocket for bus tickets. Unlimited Access (UA) programs on college campuses are a win-win-win situation for students, universities, and transit agencies, decreasing student costs, reducing on-campus parking demand, and increasing transit funding and ridership. Despite the reported benefits, ridership from the U-PASS program has decreased …
Nematic Liquid Crystal Carbon Nanotube Composite Materials For Designing Rf Switching Devices, Jeffrey Josse
Nematic Liquid Crystal Carbon Nanotube Composite Materials For Designing Rf Switching Devices, Jeffrey Josse
Master's Theses (2009 -)
Radio frequency microelectromechanical systems (RF MEMS) devices are microdevices used to switch or modify signals from the RF to millimeter wave (mmWave) frequency range. Liquid crystals (LCs) are widely used as electro-optic modulators for display devices. An electric field-induced electrical conductivity modulation of pure LC media is quite low which makes it difficult to use for RF MEMS switching applications. Currently, RF MEMS devices are characterized as an excellent option between solid-state and electromechanical RF switches to provide high isolation, low insertion loss, low power usage, excellent return loss, and large frequency band. However, commercial usage is low due to …