Engineering Commons^™

Reactivity Of Hydroxyl Radical: Mechanistic Insight Into The Reactivity With Dissolved Organic Matter, Mallika Khare

Dissertations, Master's Theses and Master's Reports

Advanced Oxidation Processes (AOPs) that produce highly reactive hydroxyl radicals (HO•) are attractive and promising water and wastewater treatment technologies because HO• can destroy a variety of organic compounds. However, background dissolved organic matter (DOM) significantly reduces the performance of AOPs by scavenging HO•. The conventional experimental approach to identifying ‘average’ reactivity limits our mechanistic understanding of the reaction of HO• with complex mixture of surrogate DOM. This is the first study to use quantum mechanical methods to understand the elementary reactions of HO• with a model monomer of DOM. “Temple Northeastern Birmingham model” (TNB). The theoretically calculated aqueous-phase free …

Mechanical Testing Of Fused Filament 3-D Printed Components For Distributed Manufacturing, Nagendra Gautam Tanikella

Dissertations, Master's Theses and Master's Reports

Fused filament fabrication (FFF)-based open-source 3-D printers offer the potential of decentralized manufacturing both in developing and developed countries. Unfortunately, a severe lack of data and standards relating to material properties and printed components limit this potential. This thesis first investigates the mechanical properties of a wide-range of FFF materials and provides a database of mechanical strength of the materials tested. The results demonstrate that the tensile strength of a 3-D printed specimen depends largely on the mass of the specimen, which provides a means to estimate the strength of 3-D printed components. Then this information is used to evaluate …

Nebraska Summary: S1078 New Holland T7.260, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Nebraska Summary: S1113 John Deere 6175m, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

High Resolution Time-Of-Arrival Ranging Of Wireless Sensor Nodes In Non-Homogenous Environments, Mohsen Jamalabdollahi

Dissertations, Master's Theses and Master's Reports

Wireless Sensor Networks (WSN) have emerging applications in homogeneous environments such as free space. In addition, WSNs are finding new applications in non-homogeneous (NH) media. All referred applications entail location information of measured data or observed event. Localization in WSNs is considered as the leading remedy, which refers to the procedure of obtaining the sensor nodes relative location utilizing range measurements. Localization via Time-of-Arrival (ToA) estimation has received considerable attention because of high precision and low complexity implementation, however, the traditional techniques are not feasible in NH media due to frequency dispersion of transmitted ranging waveform.

In this work, a …

Evaluating The Anaerobic Codigestion Potential Of Stillage And Dairy Manure In A Tubular Digester, Brad J. Weiss

Dissertations, Master's Theses and Master's Reports

Evaluations of the anaerobic treatment of sugarcane stillage and dairy manure in a low cost tubular digester were performed in small scale batch experiments and using mathematical simulations. A local sensitivity analysis of the model was performed, and key input parameters were adjusted until the predicted COD removal was consistent with data obtained using two full-scale digesters. Simulations were performed to evaluate COD removal and biogas production for nine different mixtures of stillage and manure at four different temperatures ranging from 15˚C to 30˚C. Digestion of stillage alone was not effective, but when codigested with 20% or more manure, COD …

Use Of Lidar In The Design Of Grassed Waterways: Case Study In Agricultural Management In Oklahoma, Annette Sparks

Dissertations, Master's Theses and Master's Reports

Before the advent of Light Detection and Ranging (LiDAR) technology, farm-level infrastructure for sustainable agriculture was designed using topographic maps. LiDAR is a remote sensing method whereby reflected laser pulses are measured to generate high-resolution 3D images of the terrain. This report compares these two methods in the design of grassed waterways for flood drainage and evaluates how the quantitative difference between the two methods can affect the overall hydrologic design. The benefits of LiDAR are expected to be higher accuracy and precision in design, as well as greater reproducibility or consistency, regardless of the designer. To carry out this …

Ultra-Thin Microfluidic Devices Built Via Thermal Lamination, Fernando Ontiveros, J Ryan Mcdowell

Biology Faculty/Staff Publications

Widespread adoption of lab-on-a-chip technologies may be encouraged by the development of methods and devices that require minimal investment and expertise. Here we describe a type of device that makes exclusive use of consumer-grade components and equipment. The devices consist of as little as three layers of a polymer film, with microchannels shaped by an inexpensive craft cutter, and sealed by thermal lamination. Fabrication time is in the order of minutes, and the method does not require any prior training. To showcase the properties and demonstrate the versatility of the devices, we describe their use to generate fully biocompatible lipid-based …

2016 Nebraska Groundwater Quality Monitoring Report

Nebraska Department of Environmental Quality: Reports

The 2001 Nebraska Legislature passed LB329 (Neb. Rev. Stat. §46-1304) which, in part, directed the Nebraska Department of Environmental Quality (NDEQ) to report on groundwater quality monitoring in Nebraska. Reports have been issued annually since December 2001. The text of the statute applicable to this report follows: “The Department of Environmental Quality shall prepare a report outlining the extent of ground water quality monitoring conducted by natural resources districts during the preceding calendar year. The department shall analyze the data collected for the purpose of determining whether or not ground water quality is degrading or improving and shall present the …

Pilot's Handbook Of Aeronautical Knowledge, 2016, United States Federal Aviation Administration

United States Department of Transportation: Publications

The Pilot’s Handbook of Aeronautical Knowledge provides basic knowledge that is essential for pilots. This handbook introduces pilots to the broad spectrum of knowledge that will be needed as they progress in their pilot training. Except for the Code of Federal Regulations pertinent to civil aviation, most of the knowledge areas applicable to pilot certification are presented.

The Pilot’s Handbook of Aeronautical Knowledge provides basic knowledge for the student pilot learning to fly, as well as pilots seeking advanced pilot certification. For detailed information on a variety of specialized flight topics, see specific Federal Aviation Administration (FAA) handbooks and Advisory …

Impacts Of Soil Type And Moisture On The Capacity Of Multi-Carrier Modulation In Internet Of Underground Things, Abdul Salam, Mehmet C. Vuran

School of Computing: Conference and Workshop Papers

Unique interactions between soil and communication components in wireless underground communications necessitate revisiting fundamental communication concepts from a different perspective. In this paper, capacity profile of wireless underground (UG) channel for multi-carrier transmission techniques is analyzed based on empirical antenna return loss and channel frequency response models in different soil types and moisture values. It is shown that data rates in excess of 124 Mbps are possible for distances up to 12 m. For shorter distances and lower soil moisture conditions, data rates of 362 Mbps can be achieved. It is also shown that due to soil moisture variations, UG …

Table Headers: An Entrance To The Data Mine, George Nagy, Sharad C. Seth

School of Computing: Conference and Workshop Papers

Algorithmic methods are demonstrated for information extraction from table header elements, including data categories and data hierarchies. The table headers are found with the Minimum Index Point Search algorithm. The header-path alignment and header completion algorithms yield database-ready table content and configuration statistics on a random sample of 400 diverse tables with ground truth and 1120 tables without ground truth from international statistical data sites.

Nsu College Engineering And Computing Curriculum 2016, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Locality-Aware Dynamic Task Graph Scheduling, Jordyn Maglalang, Sriram Krishnamoorthy, Kunal Agrawal

All Computer Science and Engineering Research

Dynamic task graph schedulers automatically balance work across processor cores by scheduling tasks among available threads while preserving dependences. In this paper, we design NabbitC, a provably efficient dynamic task graph scheduler that accounts for data locality on NUMA systems. NabbitC allows users to assign a color to each task representing the location (e.g., a processor core) that has the most efficient access to data needed during that node’s execution. NabbitC then automatically adjusts the scheduling so as to preferentially execute each node at the location that matches its color—leading to better locality because the node is likely to make …

Enhanced Corrosion Protection And Biocompatibility Of A Plga-Silane Coating On Az31 Mg Alloy For Orthopaedic Applications, Sankalp Agarwal, Muhammad Morshed, Marie-Noelle Labour, David Hoey, Brendan Duffy, James Curtin, Swarna Jaiswal

Articles

This paper reports a multi-step procedure to fabricate a novel corrosion resistant and biocompatible PLGA-silane coating on the magnesium (Mg) alloy AZ31. The first step involves alkaline passivation followed by dip coating in a methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS) mixture to produce a cross-linked siloxane coating. The second step is to impart an amine functionalization to the silane modified surface by using 3-aminopropyl-triethoxy silane (APTES) for promoting adhesion of the acid terminated poly-(lactic-co-glycolic) acid (PLGA) as a final coating step. Static contact angle measurements, Fourier transform infrared spectroscopy and scanning electron microscopy analysis confirmed the successful assembly of coatings on …

Techno-Economic Feasibility Of Distributed Torrefaction Systems Using Corn Stover Feedstock, Evan Almberg

Electronic Theses and Dissertations

This study investigated the economic feasibility of distributed torrefaction biorefining systems using corn stover feedstock to generate value-­‐added products. Distributed torrefaction systems have the potential to operate on private agricultural enterprises as well as community-­‐scale processing facilities, similar in scale to local grain elevators. Distributed systems will thus, reduce the need for large capital investments for dedicated commercial biorefining facilities and decrease logistical concerns for harvesting and marketing the torrefied corn stover products. In this study, a techno-­‐economic model was developed to analyze the economics of harvesting techniques, logistics, processing requirements, and end product utilization. Results were determined using baseline …

Dynamic And Thermal Properties Of Cellulose Nanocrystal/Epoxy Nanocomposites, Jaeyong Shin

Electronic Theses and Dissertations

No abstract provided.

Reverse-Selective Behavior Of The Room Temperature Ionic Liquid Based Membranes, Amir Khakpay

Electronic Theses and Dissertations

This experimental study explore the reverse-selective potential of RTIL based membranes by lowering the solubility of the non-condensing gases like N2 and CH4. It explored reverse-selectivity by measuring the permeance of carbon dioxide, nitrogen, methane, propylene, propane, 1-butene, and butane in supported ionic liquid membranes (SILM). Particular attention was given to the reverse-selective behavior in the propane/methane and propane/nitrogen separations. For this purpose, a series of experiments were conducted in a batch gas permeance system. The permeance of the above-mentioned gases was obtained using polyvinylidene fluoride (PVDF) as the support and [emim][Tf2N], [emim][BF4], [emim][TfO], [emim][DCA], [emim][SCN], and [bmim][NO3] as immobilized …

Validation Of Integrated Coast-Ocean Model Cche2d-Coast And Development Of Wind Model, Afshin Gazerzadeh

Electronic Theses and Dissertations

The eastern and southern coastlines of the United States are two of the most cyclone-prone areas of the world. The effects of tropical cyclones vary mainly depending on wind intensity and geological features of the coast that it is crossing. Higher winds potentially generate higher storm surges and consequently larger floods occur along the coastlines. Therefore, it is critical to accurately predict winds, storm surge, and waves associated with a hurricane. In the present study, an integrated coastal and ocean process model, CCHE2D-Coast, is validated by assessing the model’s capabilities in simulating coast-ocean circulations driven by the astronomical tides on …

Flood Disaster Resilient Bridge Structures For Sustainable Bridge Management Systems, Alper Durmus

Electronic Theses and Dissertations

Extreme weather events are occurring at an increasing ferocity and frequency. Floods are the most comand damaging natural disaster. More than 4,400 occurrences of flood disasters have been reported globally between 1900 and 2016. As a result, around seven million people were killed and millions more were displaced. Climate impacts are expected to intensify weather related flooding events, and sea level rise expected worldwide will increase the risk of coastal disasters. Transportation infrastructure, vital to the economy and society of every country, is especially prone to the inland and coastal floods. Bridge structures are under the constant threat of these …

Reduction Of Mutual Coupling In Antenna Technology Using Elliptically Shaped Metasurfaces, Gabriel Moreno

Electronic Theses and Dissertations

This thesis is devoted to the use of metasurfaces for the goals of the reduction of mutual coupling between closely spaced antennas and the increase of antenna bandwidth. This is done first using a graphene monolayer as a cloak to decrease mutual coupling and restore radiation patterns for closely spaced antennas at THz frequencies. The introduction of the graphene monolayer was also extensively studied in regards to the effect on the radiation properties of the antennas. The use of metasurfaces also has other applications, in particular with the bandwidth of antennas, where an anisotropic metasurface can be used to drastically …

Field Use Of An Acoustic Surrogate System To Monitor Gravel Bed Load Flux, Jarrod Grant Bullen

Electronic Theses and Dissertations

There has long been an interest in monitoring the movement of large particle sediments traveling through fast-moving streams and rivers. However, there have been numerous challenges concerning the methodology best suited to collect these data. Many studies have been done to alleviate this problem, both through physical and surrogate methods. Physical methods include bed load traps that provide data over a specific time frame, but the fluctuation of sediment can change drastically over hours; thus, bed load traps are unable to provide a reliable predictive model. Since studies have shown a relationship between acoustic energy and particle impacts, the field …

Reconstructing Lithofacies Of The Norphlet Formation (Jurassic) As Potential Exploration Targets: Little Cedar Creek And Brooklyn Fields, Southwest Alabama, Catherine E. Henry

Electronic Theses and Dissertations

The Norphlet Formation is a Jurassic-aged siliciclastic unit located across the southeastern United States and offshore Gulf of Mexico. The eolian dune sands present in the Norphlet Formation serve as oil and gas reservoirs, making the formation of particular interest to oil and gas companies. Stable Appalachian ridges are the source of the Norphlet Formation, however deposition is related to complex faults and structures resulting from movement of the Louann Salt. Erosion of the ancestral Appalachian Mountains resulted in the deposition of four main lithofacies: basal shales, conglomerates and conglomeratic sandstones, the Denkman Sandstone member, and a redbed succession. Additionally, …

A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments, Ryan Keith Hedgepeth

Electronic Theses and Dissertations

A collaborative study was conducted to examine the degradation of commercially pultruded uni-directional e-glass composites. The case study specimens, including a variety of commercially pultruded polyester/e-glass and vinylester/e-glass composites were exposed to corrosive environments, namely: distilled water (h2o), bleach (naclo), and hydrochloric acid (hcl) for a minimum of 60 days, and the degradation was analyzed. Such a study was chosen on two accounts, 1) to contribute viable data to industry and research and 2) to provide data to be used to develop a standardized practice to characterize the durability for pultruded composites used for structural applications. A control group was …

Computation Aided Design Of Multicomponent Refractory Alloys With A Focus On Mechanical Properties, Paul Daniel Clark

Electronic Theses and Dissertations

Quantum mechanical calculations paired with exponential growth in computer processing speed has created a paradigm shift in materials discovery. Simulations can be carried out to accurately predict structure-composition-property relationships of novel systems. This work focuses on calculating elastic properties of high entropy alloys, a new class of alloys that are built from 4+ elements in equi-atomic proportion. These alloys often exhibit simple microstructures and each constituent element contributes its properties to the overall bulk properties of the amalgamated material. This "cocktail" effect has led to the discovery of many alloys which could drive technical advances in the future. Elastic properties …

Constant Velocity Combustion Scramjet Analysis, Lakshmi Srikanth Tiruveedula

Electronic Theses and Dissertations

The supersonic combustion ramjet or scramjet, is the most suitable engine cycle for sustained hypersonic flight in the atmosphere. The present work deals with the performance of a scramjet engine by parametrically analyzing the performance of the ideal scramjet using the engine parameters: specific thrust, fuel-to-air ratio, thrust specific fuel consumption, thermal efficiency, propulsive efficiency, overall efficiency and thrust flux. The objective of the work is to determine the desirable performance terms of the ideal scramjet, by varying three different candidate fuels and three different candidate materials for the combustion chamber. The engine parameters are related by the lower heating …

The Relationship Of Corporate Financial Performance And Innovation Among Manufacturing Industries, Charlaine T. Chong, Samantha R. Chua, Ma. Catrina S. Dy, Antonio Miguel E. Villavicencio

Angelo King Institute for Economic and Business Studies (AKI)

Innovation is becoming a critical determinant of the survival and advancement of firms. Despite this realization, there is a dearth of literature that tackles the subject matter and its specific role in corporate settings remains vague. Using corporate data on East and Southeast Asian manufacturing firms from 2008 to 2013, this study aims to identify the impact of corporate financial performance on research and development (R&D) expenditure as a measure of innovation. On the whole, the researchers utilized random effects (REM) and fixed effects (FEM) models to establish the relationship between R&D and corporate performance. The researchers, then, identified the …

Effects Of High Voltage Nanosecond Electric Pulses On Eukaryotic Cells (In Vitro): A Systematic Review, Tina Batista Napotink, Matej Reberšek, P. Thomas Vernier, Babara Mali, Damijan Miklavčič

Bioelectrics Publications

For this systematic review, 203 published reports on effects of electroporation using nanosecond high-voltage electric pulses (nsEP) on eukaryotic cells (human, animal, plant) in vitro were analyzed. A field synopsis summarizes current published data in the field with respect to publication year, cell types, exposure configuration, and pulse duration. Published data were analyzed for effects observed in eight main target areas (plasma membrane, intracellular, apoptosis, calcium level and distribution, survival, nucleus, mitochondria, stress) and an additional 107 detailed outcomes. We statistically analyzed effects of nsEP with respect to three pulse duration groups: A: 1–10 ns, B: 11–100 ns and C: …

Electroporation By Subnanosecond Pulses, Iurii Semenov, Shu Xiao, Andrei G. Pakhomov

Bioelectrics Publications

Electropermeabilization of cell membranes by micro- and nanosecond-duration stimuli has been studied extensively, whereas effects of picosecond electric pulses (psEP) remain essentially unexplored. We utilized whole-cell patch clamp and Di-8-ANEPPS voltage-sensitive dye measurements to characterize plasma membrane effects of 500 ps stimuli in rat hippocampal neurons (RHN), NG108, and CHO cells. Even a single 500-ps pulse at 190kV/cm increased membrane conductance and depolarized cells. These effects were augmented by applying brief psEP bursts (5–125 pulses), whereas the rate of pulse delivery (8Hz–1kHz) played little role. psEP-treated cells displayed large inward current at negative membrane potentials but modest or no conductance …

Statistical Scaling Of Turbulent Surface Pressure In The Atmospheric Boundary Layer, Gregory William Lyons

Electronic Theses and Dissertations

Turbulence in the atmosphere produces fluctuations in static pressure through a variety of mechanisms. These fluctuations are of interest both to atmospheric scientists, as a fluid dynamic property, and to acousticians, as a source of wind noise. At the ground surface, previous work has found the dominant source of pressure fluctuations to be an interaction of the turbulent vertical velocity with the shear rate in the mean wind. In this work, the existing theoretical framework was extended to investigate the effects of atmospheric stability, shear anisotropy, and different turbulence models. A rapid-distortion model was introduced and compared with the existing …