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2018

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Articles 1 - 30 of 9374

Full-Text Articles in Engineering

Numerical Simulations Of Premixed Flames Of Multi Component Fuels/Air Mixtures And Their Applications, Essa Kh I J Salem Dec 2018

Numerical Simulations Of Premixed Flames Of Multi Component Fuels/Air Mixtures And Their Applications, Essa Kh I J Salem

Theses and Dissertations--Mechanical Engineering

Combustion has been used for a long time as a means of energy extraction. However, in the recent years there has been further increase in air pollution, through pollutants such as nitrogen oxides, acid rain etc. To solve this problem, there is a need to reduce carbon and nitrogen oxides through lean burning, fuel dilution and usage of bi-product fuel gases. A numerical analysis has been carried out to investigate the effectiveness of several reduced mechanisms, in terms of computational time and accuracy. The cases were tested for the combustion of hydrocarbons diluted with hydrogen, syngas, and bi-product fuel in ...


The Effects Of Silica On The Properties Of Vitreous Enamels, Signo Tadeu Dos Reis, Mike Koenigstein, Liang Fan, Genda Chen, Luka Pavic, Andrea Mogus-Milankovic Dec 2018

The Effects Of Silica On The Properties Of Vitreous Enamels, Signo Tadeu Dos Reis, Mike Koenigstein, Liang Fan, Genda Chen, Luka Pavic, Andrea Mogus-Milankovic

Materials Science and Engineering Faculty Research & Creative Works

Ground coat enamels for low carbon steel that contain silica as a mill addition have been developed to study the changes of their properties. Acid-resistant commercial enamel where silica addition was varied from 0 to 10.0 wt % was used for this investigation. The effects of the addition on the corrosion resistance, thermal properties, electrical properties, and mechanical adherence of the enamel to low carbon steel were studied. The corrosion resistance of the steel enameled coupons was tested using a salt spray (fog) apparatus for time periods reaching 168 h at room temperature. It was found that, although the density ...


Undergraduate Voices, Volume 1 (2018): Addendum, Amir Kalan Dec 2018

Undergraduate Voices, Volume 1 (2018): Addendum, Amir Kalan

Undergraduate Voices

Additional articles approved for publication in December 2018 in Volume 1.


"Whole-Brained" Engineering Education In Undergraduate Studies At The University Of Dayton, Kylie Moellering Dec 2018

"Whole-Brained" Engineering Education In Undergraduate Studies At The University Of Dayton, Kylie Moellering

Undergraduate Voices

This inquiry is a case study which explores, explicates, and summarizes the recent shift to “whole-brained” engineering education for undergraduate-level students at the University of Dayton. This case study is primarily structured around the experiences and insights of an interviewee, Dr. Ken Bloemer, who is the Director of the Visioneering Center at the University of Dayton. The Visioneering Center is principally focused on promoting the progress of engineering education at the university. Voices from scholarly literature pertaining to this vision and other undergraduate engineering curricula are then used to reinforce the interviewee’s views and give deeper insight into the ...


Survey On Synchrophasor Data Quality And Cybersecurity Challenges, And Evaluation Of Their Interdependencies, Aditya Sundararajan, Tanwir Khan, Amir Moghadasi, Arif I. Sarwat Dec 2018

Survey On Synchrophasor Data Quality And Cybersecurity Challenges, And Evaluation Of Their Interdependencies, Aditya Sundararajan, Tanwir Khan, Amir Moghadasi, Arif I. Sarwat

Electrical and Computer Engineering Faculty Publications

Synchrophasor devices guarantee situation awareness for real-time monitoring and operational visibility of smart grid. With their widespread implementation, significant challenges have emerged, especially in communication, data quality and cybersecurity. The existing literature treats these challenges as separate problems, when in reality, they have a complex interplay. This paper conducts a comprehensive review of quality and cybersecurity challenges for synchrophasors, and identifies the interdependencies between them. It also summarizes different methods used to evaluate the dependency and surveys how quality checking methods can be used to detect potential cyberattacks. This paper serves as a starting point for researchers entering the fields ...


17-06 Public Vs Private Transportation Network Accessibility And Maternal-Infant Health Outcomes Across The Urban-Rural Boundary In Kalamazoo County, Michigan, Kathleen Baker Dec 2018

17-06 Public Vs Private Transportation Network Accessibility And Maternal-Infant Health Outcomes Across The Urban-Rural Boundary In Kalamazoo County, Michigan, Kathleen Baker

Transportation Research Center Reports

This project is twofold. The first part of the project deals specifically with the benefits of multimodal transportation modeling to understand community structure of public health access in a community. Maternal risk and infant outcomes are examined in Kalamazoo County, MI with respect to transportation network accessibility by public transit and private vehicle across the urban-rural continuum. Infants born to mothers just outside the urban core had a higher rate of poor outcomes. Maternal risk factors, by contrast, were associated with the accessible rural areas – areas outside the city proper, but within 30 minutes by car to services. When as ...


17-05 Effects Of Safe Bicycle Passing Laws On Drivers' Behavior And Bicyclists' Safety, Ron Van Houten, Jun-Seok Oh, Valerian Kwigizile, Ahmad Feizi, Majid Mastali Dec 2018

17-05 Effects Of Safe Bicycle Passing Laws On Drivers' Behavior And Bicyclists' Safety, Ron Van Houten, Jun-Seok Oh, Valerian Kwigizile, Ahmad Feizi, Majid Mastali

Transportation Research Center Reports

This report identifies the effect of passing distance laws on drivers’ behaviors and bicyclist’s safety during an overtaking maneuver. Using an instrumented bicycle and driver survey, the study measured bicycle passing in a naturalistic field experiment using video recording, an ultrasonic distance measuring device, and a LiDAR. In order to evaluate the effect of passing distance laws, the study examined jurisdictions with a three-foot passing law, with a five-foot passing law, and without a passing law. The experiment required a bicyclist to ride the instrumented bicycle in two-lane and three-lane roads to capture the distance between the bicycle and ...


Utah Code 73-3-30, Utah State Legislature Dec 2018

Utah Code 73-3-30, Utah State Legislature

All In-stream Flows Material

73-3-30 Change application for an instream flow.


Cardiac Regenerative Medicine: Insights From Healthy And Diseased Engineered Tissues, Pamela Grace Hitscherich Dec 2018

Cardiac Regenerative Medicine: Insights From Healthy And Diseased Engineered Tissues, Pamela Grace Hitscherich

Dissertations

Cardiovascular disease remains the leading cause of mortality in the United States. Current tissue engineering approaches have fallen short of promoting fully functional cardiovascular cells and the post-myocardial infarction microenvironment is still not well understood. These gaps in knowledge are addressed in this dissertation through the development of in vitro engineered cardiac tissues using electroactive materials to enhance the differentiation of pluripotent stem cell derived cardiomyocytes and through the development of in vitro myocardial inflammation models dedicated to understanding cardiomyocytes and macrophages interactions.

Specifically, piezoelectric poly (vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) supports the attachment and survival of mouse embryonic stem cell derived ...


Experimental Study Of Low Cycle Fatigue Properties For Epoxy Resins With Dibutyl Phthalate (Dbp), Zhi Wang, Jiajia Zhou, Lianjian Song, Long Li Dec 2018

Experimental Study Of Low Cycle Fatigue Properties For Epoxy Resins With Dibutyl Phthalate (Dbp), Zhi Wang, Jiajia Zhou, Lianjian Song, Long Li

Department of Civil, Environmental, and Geospatial Engineering Publications

In order to improve the toughness of traditional epoxy resin, dibutyl phthalate (DBP) was introduced into the epoxy resin. The static mechanical performance of plasticized and unplasticized epoxy resin was evaluated. The test results showed that the DBP modified epoxy resin can obtain a higher toughness than conventional epoxy resin, but the elastic modulus and the tensile strength were slightly reduced. The low cycle fatigue test results indicated that the stress ratio and the stress level were two critical factors of fatigue life, which was increased with the growth of stress ratio. It was also found that the fatigue life ...


Amorphous Metal Oxide Semiconductor Thin Film Transistors For Printed Electronics, Mustafa Mohammad Yousef Dec 2018

Amorphous Metal Oxide Semiconductor Thin Film Transistors For Printed Electronics, Mustafa Mohammad Yousef

Theses

There is an acute market need for solution-processable semiconductor inks that can form the essential components of the printed analog and digital circuits. Currently, the industry is migrating beyond simply printing conductive metals for interconnects and embracing higher integration by printing transistors directly on the same substrate. This thesis focuses on investigating solution-processed amorphous indium gallium zinc oxide (IGZO) as a semiconducting channel layer of a field-effect transistor to enable low-cost, large-area printed electronics that are physically flexible and optically transparent. Specifically, we aim to achieve field-effect mobility exceeding 1 cm2/Vs, to overcome the limits faced in existing ...


Storage Systems For Mobile-Cloud Applications, Nafize R. Paiker Dec 2018

Storage Systems For Mobile-Cloud Applications, Nafize R. Paiker

Dissertations

Mobile devices have become the major computing platform in todays world. However, some apps on mobile devices still suffer from insufficient computing and energy resources. A key solution is to offload resource-demanding computing tasks from mobile devices to the cloud. This leads to a scenario where computing tasks in the same application run concurrently on both the mobile device and the cloud.

This dissertation aims to ensure that the tasks in a mobile app that employs offloading can access and share files concurrently on the mobile and the cloud in a manner that is efficient, consistent, and transparent to locations ...


Magnetic Field Assisted Milli-Scale Robotic Assembly Machine: An Approach To Massively Parallel Swarm Robotic Automation Systems, Yan Liu Dec 2018

Magnetic Field Assisted Milli-Scale Robotic Assembly Machine: An Approach To Massively Parallel Swarm Robotic Automation Systems, Yan Liu

Dissertations

The vision of highly parallel, automated manufacturing systems that can build macroscopic products by heterogeneous assembly of many small devices will have a major impact in manufacturing. In this study, a novel milli-scale robotic assembly machine with parallel capabilities, assisted with programmable magnetic field, is developed. The machine prototype consists of a 16x16 array of electromagnets. The dimensions of the electromagnets are 5mm high with an inner diameter of 1.1mm and outer diameter of 2.5mm. All the electromagnets are driven by a 16x16 array of H-Bridges, and an Arduino microcontroller is used to control and program the arrays ...


Impairments In Ground Moving Target Indicator (Gmti) Radar, Phuoc Doan Huu Vu Dec 2018

Impairments In Ground Moving Target Indicator (Gmti) Radar, Phuoc Doan Huu Vu

Dissertations

Radars on multiple distributed airborne or ground based moving platforms are of increasing interest, since they can be deployed in close proximity to the event under investigation and thus offer remarkable sensing opportunities. Ground moving target indicator (GMTI) detects and localizes moving targets in the presence of ground clutter and other interference sources. Space-time adaptive processing (STAP) implemented with antenna arrays has been a classical approach to clutter cancellation in airborne radar. One of the challenges with STAP is that the minimum detectable velocity (MDV) of targets is a function of the baseline of the antenna array: the larger the ...


Methods To Improve The Remediation Of Polycyclic Aromatic Hydrocarbons (Pahs) In Aerobic And Anaerobic Environments, Brian Wartell Dec 2018

Methods To Improve The Remediation Of Polycyclic Aromatic Hydrocarbons (Pahs) In Aerobic And Anaerobic Environments, Brian Wartell

Dissertations

Oil spills occur regularly in terrestrial environments and crude oil can contain many compounds that are highly resistant to degradation. Among these compounds are high levels of polycyclic aromatic hydrocarbons (PAHs) which are not only toxic but can also be carcinogenic and/or mutagenic. The first chapter of this dissertation includes an extensive review chapter on the variables affecting the anaerobic degradation of hydrocarbons, with a particular focus on PAHs. Electron acceptors, electron donors, temperature, salinity, pH all play key roles in determining the possibility effective of effective degradation occurring. Thus, by addressing solutions, such as biostimulation, improving environmental variables ...


Optimizing Resource Allocation In Eh-Enabled Internet Of Things, Ali Shahini Dec 2018

Optimizing Resource Allocation In Eh-Enabled Internet Of Things, Ali Shahini

Dissertations

Internet of Things (IoT) aims to bridge everyday physical objects via the Internet. Traditional energy-constrained wireless devices are powered by fixed energy sources like batteries, but they may require frequent battery replacements or recharging. Wireless Energy Harvesting (EH), as a promising solution, can potentially eliminate the need of recharging or replacing the batteries. Unlike other types of green energy sources, wireless EH does not depend on nature and is thus a reliable source of energy for charging devices. Meanwhile, the rapid growth of IoT devices and wireless applications is likely to demand for more operating frequency bands. Although the frequency ...


Overcoming Conventional Modeling Limitations Using Image- Driven Lattice-Boltzmann Method Simulations For Biophysical Applications, Olufemi E. Kadri Dec 2018

Overcoming Conventional Modeling Limitations Using Image- Driven Lattice-Boltzmann Method Simulations For Biophysical Applications, Olufemi E. Kadri

Dissertations

The challenges involved in modeling biological systems are significant and push the boundaries of conventional modeling. This is because biological systems are distinctly complex, and their emergent properties are results of the interplay of numerous components/processes. Unfortunately, conventional modeling approaches are often limited by their inability to capture all these complexities. By using in vivo data derived from biomedical imaging, image-based modeling is able to overcome this limitation.

In this work, a combination of imaging data with the Lattice-Boltzmann Method for computational fluid dynamics (CFD) is applied to tissue engineering and thrombogenesis. Using this approach, some of the unanswered ...


Characterization Of Self-Heating Effects And Assessment Of Its Impact On Reliability In Finfet Technology, Peter Christopher Paliwoda Dec 2018

Characterization Of Self-Heating Effects And Assessment Of Its Impact On Reliability In Finfet Technology, Peter Christopher Paliwoda

Dissertations

The systematically growing power (heat) dissipation in CMOS transistors with each successive technology node is reaching levels which could impact its reliable operation. The emergence of technologies such as bulk/SOI FinFETs has dramatically confined the heat in the device channel due to its vertical geometry and it is expected to further exacerbate with gate-all-around transistors.

This work studies heat generation in the channel of semiconductor devices and measures its dissipation by means of wafer level characterization and predictive thermal simulation. The experimental work is based on several existing device thermometry techniques to which additional layout improvements are made in ...


Wireless Coverage Using Unmanned Aerial Vehicles, Hazim Shakhatreh Dec 2018

Wireless Coverage Using Unmanned Aerial Vehicles, Hazim Shakhatreh

Dissertations

The use of unmanned aerial vehicles (UAVs) is growing rapidly across many civilian application domains including real-time monitoring, search and rescue, and wireless coverage. UAVs can be used to provide wireless coverage during emergency cases where each UAV serves as an aerial wireless base station when the cellular network goes down. They can also be used to supplement the ground base station in order to provide better coverage and higher data rates for the users. During such situations, the UAVs need to return periodically to a charging station for recharging, due to their limited battery capacity. Given the recharging requirements ...


Load Balancing And Scalable Clos-Network Packet Switches, Oladele Theophilus Sule Dec 2018

Load Balancing And Scalable Clos-Network Packet Switches, Oladele Theophilus Sule

Dissertations

In this dissertation three load-balancing Clos-network packet switches that attain 100% throughput and forward cells in sequence are introduced. The configuration schemes and the in-sequence forwarding mechanisms devised for these switches are also introduced. Also proposed is the use of matrix analysis as a tool for throughput analysis.

In Chapter 2, a configuration scheme for a load-balancing Clos-network packet switch that has split central modules and buffers in between the split modules is introduced. This switch is called split-central-buffered Load-Balancing Clos-network (LBC) switch and it is cell based. The switch has four stages, namely input, central-input, central-output, and output stages ...


Interactions Between Polymer Nanoparticles And Blood Plasma Applied To Drug Delivery Systems, Mark Bannon Dec 2018

Interactions Between Polymer Nanoparticles And Blood Plasma Applied To Drug Delivery Systems, Mark Bannon

Theses

Targeted nanoparticle drug delivery has the potential to replace current forms of cancer therapy with previously unparalleled efficiency. Upon introduction into the human body, nanoparticles exhibit a substantial increase in diameter due to a biomolecular corona formation caused by interactions between blood plasma proteins and the nanoparticles. These interactions must be analyzed and understood for targeted delivery to reach its potential in both feasibility and efficiency.

To study the formation of the protein corona, polystyrene nanoparticles were incubated in vitro in goat blood plasma for 10-minute intervals, diluted to different degrees and then measured to obtain the hydrodynamic diameter of ...


Analysis Of 3d Printed Ndfeb Polymer Bonded And Organic Based Magnets, Chimaobi Ibeh Dec 2018

Analysis Of 3d Printed Ndfeb Polymer Bonded And Organic Based Magnets, Chimaobi Ibeh

Theses

Additive manufacturing (AM), or commonly known as 3D printing, has introduced to the manufacturing and commercial sectors novel ways of reducing production times, decreasing material waste, and enabling end products with multi-material configuration and complex geometric designs. From industrial scale to customer-based printers, AM has revolutionized the approach to manufacturing, prototyping, and designing in the field of medical, automotive, aerospace, biomedical, electronics and customizable products. Recently, additive manufacturing has crossed over to the area of applications in magnetism due to the economic push for the miniaturization of electronic and mechanical devices, reduction in production costs and material & design flexibility.

The ...


Icing Thickness Prediction Model For Overhead Transmission Lines, Yue Ming Dec 2018

Icing Thickness Prediction Model For Overhead Transmission Lines, Yue Ming

Theses

Failures in a large electric power system are often inevitable. Severe weather conditions are one of the main causes of transmission line failures. Using the fault data of transmission lines of Shaanxi Power Grid from 2006 to 2016, in conjunction with meteorological information, this paper analyses the relationship between the temporal-spatial distribution characteristics of meteorological disasters and the fault of transmission lines in Shaanxi Province, China.

In order to analyze the influence of micro-meteorology on ice coating, a grey correlation analysis method is proposed. This thesis calculates the grey relational between ice thickness and micro-meteorological parameters such as ambient temperature ...


The Cooperative Effects Of Channel Length-Bias, Width Asymmetry, Gradient Steepness, And Contact-Guidance On Fibroblasts’ Directional Decision Making, Quang Long Pham Dec 2018

The Cooperative Effects Of Channel Length-Bias, Width Asymmetry, Gradient Steepness, And Contact-Guidance On Fibroblasts’ Directional Decision Making, Quang Long Pham

Dissertations

Cell migration in complex micro-environments, that are similar to tissue pores, is important for predicting locations of tissue nucleation and optimizing scaffold architectures. Firstly, how fibroblast cells - relevant to tissue engineering, affect each other’s directional decisions when encountered with a bifurcation of different channel lengths was investigated. It was found that cell sequence and cell mitosis influence the directional choices that the cells made while chemotaxing. Specifically, the fibroblasts chose to alternate between two possible paths - one longer and the other shorter - at a bifurcation. This finding was counter-intuitive given that the shorter path had a steeper chemoattractant gradient ...


Performance Of C2H4 Reductant In Activated-Carbon-Supported Mnox-Based Scr Catalyst At Low Temperatures, Guangli Liu, Dongtai Han, Jie Cheng, Yongshi Feng, Wenbin Quan, Li Yang, Kozo Saito Dec 2018

Performance Of C2H4 Reductant In Activated-Carbon-Supported Mnox-Based Scr Catalyst At Low Temperatures, Guangli Liu, Dongtai Han, Jie Cheng, Yongshi Feng, Wenbin Quan, Li Yang, Kozo Saito

Mechanical Engineering Faculty Publications

Hydrocarbons as reductants show promising results for replacing NH3 in SCR technology. Therefore, considerable interest exists for developing low-temperature (< 200 °C) and environmentally friendly HC-SCR catalysts. Hence, C2H4 was examined as a reductant using activated-carbon-supported MnOx-based catalyst in low-temperature SCR operation. Its sensitivity to Mn concentration and operating temperature was parametrically studied, the results of which showed that the catalyst activity followed the order of 130 °C > 150 °C > 180 °C with an optimized Mn concentration near 3.0 wt.%. However, rapid deactivation of catalytic activity also occurred when using C2H4 as the reductant. The mechanism of deactivation was explored and is ...


Costs And Benefits Of Flood Mitigation In Louisiana, Arash Taghi Nezhad Bilandi Dec 2018

Costs And Benefits Of Flood Mitigation In Louisiana, Arash Taghi Nezhad Bilandi

LSU Doctoral Dissertations

Assessing the costs and benefits of hazard mitigation efforts is an essential component of disaster management, planning, and resilience assessment. These calculations are particularly important in locations vulnerable to multiple hazards with high frequencies, such as coastal Louisiana. This study aims to provide an improved understanding of the costs and benefits of flood mitigation efforts in Louisiana funded by federal government grants between 2005 and 2015. Project data provided by the Governor’s Office of Homeland Security and Emergency Preparedness (GOHSEP) were summarized and missing values were imputed using robust statistical approaches. Elevation project cost was investigated for prediction by ...


Transient Transmission Oscillations In Doped And Undoped Lithium Niobate Induced By Near-Infrared Femtosecond Pulses, Bryan J. Crossman, Gregory J. Taft Dec 2018

Transient Transmission Oscillations In Doped And Undoped Lithium Niobate Induced By Near-Infrared Femtosecond Pulses, Bryan J. Crossman, Gregory J. Taft

Physics Faculty Publications

Transient transmission oscillations in X-cut and Z-cut congruent, iron-doped, and magnesium-doped lithium niobate samples were measured using 50 fs, 800 nm, 0.5 nJ pulses from a self-mode-locked Ti:sapphire laser in an optical pump–probe system. Several Raman-active oscillation modes excited by these pulses were observed as changes in the transmitted probe intensity versus time delay between the pump and probe pulses. The samples were rotated to determine how the incident polarization of the pump pulses affects the mode excitations. The observed Raman-active oscillations correspond to previously reported symmetry modes measured with traditional, continuous-wave, Raman spectroscopy using ...


The Internet Of Energy: Architectures, Cyber Security, And Applications, Kun Wang, Yan Zhang, Song Guo, Mianxiong Dong, Rose Qingyang Hu, Lei He Dec 2018

The Internet Of Energy: Architectures, Cyber Security, And Applications, Kun Wang, Yan Zhang, Song Guo, Mianxiong Dong, Rose Qingyang Hu, Lei He

Electrical and Computer Engineering Faculty Publications

The energy crisis and carbon emissions have become two critical concerns globally. As a very promising solution, the concept of Internet of Energy has appeared to tackle these challenges. The Internet of Energy is a new power generation paradigm developing a revolutionary vision of smart grids into the Internet. The communication infrastructure is an essential component for implementing the Internet of Energy. A scalable and robust communication infrastructure is crucial in both operating and maintaining smart energy systems. The wide-scale implementation and development of Internet of Energy into industrial applications should take into account the following challenges:


Liquid Suspended Fertilizers On Base Wet-Processing Phosphoric Acid Of Kyzylkum ., Sh.Yu Nomozov, U.K Alimov, Sh.S Namazov, A.R Seytnazarov Dec 2018

Liquid Suspended Fertilizers On Base Wet-Processing Phosphoric Acid Of Kyzylkum ., Sh.Yu Nomozov, U.K Alimov, Sh.S Namazov, A.R Seytnazarov

Chemical Technology, Control and Management

There have been determined the composition of liquid complex fertilizers based on low concentrated wet-processing phosphoric acid from washed and calcinated phosphoconcentrated of Kyzylkum. The density and viscosity of the liquid fertilizers were studied at wide temperatures (30-80оС). It was given the list of chemical compounds generated at ammonization of wet-processing phosphoric acid with various impurities. In order to reduce precipitation of residues during the neutralization 26% aqua suspension of bentonite was used as suspendered agent in amount of 1 to 3%. Rheological properties of the nitrogen-phosphate solution show that they are in liquid condition.


Synthesis Of 2,5-Dimethylhexine-3-Diol-2.5 By A Heterogeneous Catalytic Method And Its Some Physical And Chemical Properties ., A.T Umrzokov, B.F Muhiddinov, H.M Vopoev, S.E Nurmonov Dec 2018

Synthesis Of 2,5-Dimethylhexine-3-Diol-2.5 By A Heterogeneous Catalytic Method And Its Some Physical And Chemical Properties ., A.T Umrzokov, B.F Muhiddinov, H.M Vopoev, S.E Nurmonov

Chemical Technology, Control and Management

The article examines the processes of heterogeneous-catalytic interaction of acetylene and acetone with the formation of 2,5-dimethylhexin-3-diol-2,5 using copper-bismuth-nickel-kaolin (MVNK) and copper-bismuth-nickel-bentonite (MVNB) catalysts physicochemical constants were determined depending on their nature, content and temperature of the reactions. Quantum-chemical calculations were carried out and the reaction centers of the molecules were shown on their basis.