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The KnowledgeBank at OSU (74.597 recursos)

Knowledge Bank contains collections of presentations, publications and reports related to Ohio State University.

Engineering

Mostrando recursos 1 - 20 de 557

  1. Evaluation of the Effects of Molybdenum on Sulfur Deposition in Iron-Based Oxygen Carriers for Coal Direct Chemical Looping Processes

    Kimmel, Blaise
    Increasing demand of energy and global warming creates a challenging balancing case for fossil fuel based power generation plants. While mature carbon capture technology is already developed, the technology is often burdened with significant economic penalties. Coal direct chemical looping (CDCL) is an oxy-combustion process at The Ohio State University that successfully utilizes a counter-current moving bed and iron-based metal oxide oxygen carriers to capture carbon dioxide (CO2) without incurring heavy costs. However, iron-based metal oxides in CDCL processes are susceptible to the formation of iron-sulfide (Fe-S) bonds, due to the presence of sulfur from coal. Sulfur deposition is known...

  2. Investigation of Oxidative Breakers for the Reduction of Health and Environmental Impacts Associated with Hydraulic Fracturing Fluids

    Jones, Jack
    Hydraulic fracturing ("fracking") has long been necessary to obtain natural gas in the US and around the world. Tensions in the Middle East and dwindling oil reserves that cannot be obtained by conventional means have caused fracking to become even more popular. Unfortunately, major environmental and health concerns are now associated with the fracking process. There are fears of fracking fluid impacting quality of drinking water or natural ecosystems. During hydraulic fracturing, a slurry of chemicals is pumped into the ground with the intention of creating tiny cracks and propping these cracks open with a viscos fluid containing sand particles. The viscosity...

  3. Optimization of Quantum Dot Loading into Micelles and Purification for Biological Imaging

    Chang, Christopher
    Personalized medicine to treat cancer, immunodeficiencies, and neurological disorders has expanded rapidly in the 21st century. However, diagnosis and treatment of these diseases at a molecular level is limited by current biological imaging techniques. Quantum dots have enormous potential as a biological imaging agent, with size-tunable and narrow emission spectra, improved stability over molecular dyes, and the potential for multiplexed imaging. Most quantum dots are synthesized via organic procedures that may be toxic and require either surface modification or encapsulation into nanocarriers, such as micelles. The assembly of polymers and quantum dots into micelle complexes has not been optimized. Additionally,...

  4. The effect of vacuum system base pressure of corrosion resistance on SS304L thin films

    Jiang, Runnan
    304L stainless steel (SS304L) is a low carbon steel alloy containing chromium and nickel as the main non-iron constituents. It is widely used in industry and life due to its great corrosion resistance, low cost and good ductility. However, SS304L will corrode in the form of crevice or pitting corrosion when exposed to aggressive environments. Meanwhile, recent work has shown that sputter deposited metal films with Nano-sized grains can be more corrosion resistant than bulk samples [2], and also that base pressure of the sputter deposition system has a large effect on the corrosion resistance of deposited Al thin films...

  5. Turbulent Drag Reduction and Phase Behavior of a Mixed Zwitterionic and Cationic Surfactant Solution Exhibiting Dilution Precipitation

    Poore, Christopher
    A drag reducing fluid consisting of a zwitterionic and cationic surfactant with an added counterion was observed to exhibit interesting phase behavior. At equimolar surfactant concentrations, dilution precipitation was observed. It was later noted that this system also exhibits shear precipitation. Phase diagrams were constructed to better understand the conditions under which this behavior occurs. Drag reduction data were collected using a recirculating flow system to evaluate drag reducing effectiveness. Further tests were performed using an Ares Rheometer to evaluate how the first normal stress difference is affected by the phase change. Attempts were made to quantify and describe the precipitate...

  6. DNA Origami and Rheology

    Kinnunen, Patrick
    The macro-scale behavior of engineering and biological materials is governed by the composition of the constituent molecules. Therefore, understanding connections between behaviors at different scales is of vital importance for understanding complex materials such as polymer solutions, human tissue, or cellular cytoplasm. DNA origami, a technique which uses complementary base pairing of deoxyribonucleic acid (DNA) molecules to build nanostructures with unprecedented spatial precision, involves the combination of dozens of polymer molecules. In this work, the connection between DNA origami, rheology, and material structure will be explored. Specifically, this thesis will work towards two goals: Connecting the physical properties of DNA with...

  7. Design of 3D Laser Scanner and Calibration Objects

    Hu, Ruiqi
    3D scanning is commonly used for rapid prototyping, which is a process of converting real world objects into digital models. Most commercial laser scanners in the market are expensive and the scanning process is relatively slow. This research explores the design of an inexpensive 3D laser scanner with medium accuracy for daily use. The purpose of this research is to evaluate the technical performance capability of a DIY laser scanner and compare it to the capability of a commercial scanner. As part of this analysis, a set of standard calibration objects will be developed for a range of volume sizes....

  8. AFM Investigations of Collagen Fibril Structure in the Murine Adventitia

    Albert, Benjamin
    Collagen fibrils in the extracellular matrix (ECM) maintain mechanical properties of blood vessels and act as binding sites for various proteins. In the blood vessels, the adventitial layer is mainly comprised of fibrils of collagen types 1 and 3. Previous studies have shown that the amount of collagen deposited can be affected by the expression of certain collagen-binding proteins (CBP), mutations in the collagen polypeptide chains and additional factors accompanying pathogenesis of vascular diseases. Few studies have been done to elucidate the changes in structural features of these collagen fibrils. This study investigates changes collagen fibrils in the murine adventitia....

  9. Development of Component Applications for the DESI Online System

    Beaufore, Lucas
    The focus of this thesis project is on the development of applications for use in the DESI Online System, or DOS. DOS is the online system used for the control and management of the Dark Energy Spectroscopic Instrument (DESI). The DESI project will make measurements of the spectra of galaxies and quasars in order to provide data illuminating the nature of dark energy. The control system for this instrument is still in the development stage and must be finished in time for the start of the survey in 2018. As such, this project concerns the creation of the software applications...

  10. Reverse Engineering the Dynamics of Human Pursuit Strategies

    Arumukhom Revi, Dheepak
    Many animals in the wild often perform pursuit and evasion in order to survive – pursuing prey or evading predators. In modern humans, such pursuit and evasion are most often seen in various sports and children’s games. Here, we examine what pursuit strategies people use to catch an evader, as in a game of tag. We performed human subject experiments in which we tested pursuit-evasion scenarios with two subjects per trial, one the pursuer and the other the evader, and eleven subject pairs. We used multiple protocols, with differing evader motion – evader moving in a straight line, a circle,...

  11. Creating a dynamic periodic poling system for x-cut lithium niobate chip-scale integrated optics

    Phillips, Andrew
    A system for periodically poling x-cut lithium niobate (LN) is designed and tested. LabVIEW was used for instrumentation control software to create and send an arbitrary waveform to an arbitrary waveform generator and then into a high-voltage amplifier. This high-voltage waveform was then applied through a designed poling circuit and sample station onto the prepared LN sample. Both the LabVIEW software and the poling circuit were designed to be easy to use and dynamic to allow for the poling of multiple different materials. The baseline poling of LN was achieved using the LabVIEW software and poling setup. The poling was characterized...

  12. Rheology of Polymer Nanocomposites for Advanced Tire Tread Compounds

    Liu, Ted
    The primary objective of this research was to explore polymer and nanoparticle interactions that effect rheological properties related to increasing grip while decreasing rolling resistance in tires. Generally, grip generates far greater forces than rolling resistance. With the addition of nanocomposites such as silica, however, the material can store more energy at low frequencies and dissipate more energy at higher frequencies. This results in lower rolling resistance while maintaining strong grip. The material that was used is polystyrene and polybutadiene, less complex polymers that are easier to model compared to the commonly used styrene-butadiene rubber (SBR). The nanocomposite that was...

  13. Miniature Vehicle Testbed for Intelligent Transportation Systems

    Suter, Jared
    As it is often difficult and expensive to perform traffic pattern tests on full-scale vehicles, researchers require a smaller scale model to perform initial tests. Once researchers are confident in the results from the smaller scale tests, the tests can be performed on full-scale vehicles. Although small scale testbeds have been developed, this project investigated the development of a miniature scale testbed, the Miniature Vehicle Testbed for Intelligent Transportation Systems (MVT). The MVT is a tabletop test roadway system for initial tests of vehicle systems and traffic behavior. The testbed will provide a model for real life traffic situations and...

  14. pH Effects on Ceramic Membranes Fouled by Extracellular Polymeric Substances

    Rosi, Anton
    Biofouling has proven to be a primary challenge for membrane filtration. Biofouling occurs when microbes secrete extracellular polymeric substances (EPS) which adhere to membrane surfaces. EPS impede the flow of treated water through membrane pores, resulting in increased pressure demands and operation costs. Importantly, the protein to polysaccharide ratio of EPS affects its propensity to adhere to surfaces. However, the effects of pH on EPS adherence have not been investigated over a broad pH range. This study investigates how pH affects the composition of EPS fouling layers that have been cleaned with ultrasound. This is significant because ceramic membrane technology...

  15. Design of an Online Monitoring System for Degrading Hardware Components Using Failure Modes and Effects Analysis

    Zhu, Muzhi
    A nuclear hybrid energy system, consisting of different energy subsystems such as nuclear, solar, and wind, involves frequent switching between different energy subsystems and between different controls. This can potentially lead to faster aging and failure of mechanical components. The increased usage of the turbine bypass system is considered to be the major difference between a nuclear hybrid energy system and a traditional nuclear power plant. Reliability analysis for designing such a complex system involves both high level fault propagation analysis at the conceptual design stage and low level failure prediction for specific components. The two main focuses of this...

  16. Using Echoic Flow for the Guidance and Control of an Unmanned Aerial System

    Kuric, Justin
    Abstract – Bats are able to navigate through complex environments in low light conditions with enough precision to intercept insects in midair. It has been suggested that bats accomplish this task through echolocation and the use of echoic flow. At its simplest, echoic flow is a ratio of the distance from a target to the velocity towards the target. This parameter is known as τ, it is the time to collision with the target. This project explores the use of echoic flow for the guidance and control of an Unmanned Aerial System (UAS). The UAS platform used to implement this...

  17. Strain-Dependent Variation of Critical Resolved Shear Stress: A Quantized Crystal Plasticity Analysis

    Christodoulou, Paul
    Nanocrystalline (NC) metals are metals comprised of numerous crystals (grains) that are smaller than 100 nm in diameter, on average. They have been an intense focus of research, due to several desirable mechanical properties, including high strength and high wear resistance. The classical Hall-Petch relationship between strength and grain size does not apply, suggesting that the underlying deformation physics is different in NC metals. This study uses the finite element method to explore how a variation in critical resolved shear stress (CRSS) at the nanocrystalline scale affects the macroscopic mechanical response of a NC metal. The model expands on prior...

  18. High Resolution Microstructural Analysis of Friction Stir Weld Joints between Ni-Based Alloy 625 and Mild-Carbon Steel A516

    Lee, Genevieve
    Welds between Ni-based alloys and steels are often sought after for the combination of inexpensive material with moderate to high strength in combination and superior corrosion resistance, namely within industries requiring high-performance materials functioning in harsh, corrosive environment exposure. Fusion welds between the two alloys are currently used in industry, and Solid-State welds between these alloys may be a potential candidate to join these materials. Friction Stir Welds (FSW) between Ni-based alloy 625 and Low-Carbon Steel ASTM A516 have been studied previously, but not extensively under micron-scale resolutions. Advanced electron microscopy characterization is used to analyze these joints at resolutions...

  19. Analysis of Varied Feedstocks for Oxidative Coupling of Methane in a Redox Configuration

    Alkhatib, Hussein
    With the recent shale gas boom, researchers have been devising methods of upgrading large quantities of methane to higher valued products. One of these methods, the Oxidative Coupling of Methane (OCM), creates hydrocarbons (mainly ethane and ethylene) via the catalytic coupling of methane under oxidation. Ethane and Ethylene are starting points for many polymer materials. OCM is typically run in a co-feed configuration where oxygen and methane are simultaneously fed into the reactor. In an effort to commercialize the technology a chemical looping system has been investigated to lower capital and operational costs. Chemical looping separates catalytic oxidation and reduction...

  20. Analysis of Padding Recovery Time for Sports Helmets

    Knerr, Jordan
    Sports helmets, for games such as football and lacrosse, are typically made with an outer plastic layer and an inner foam layer. They are designed to maximize impact energy attenuation in order to prevent skull fracture and traumatic brain injury. Although the current research focus has shifted to preventing concussions after a singular traumatic impact, no studies have specifically focused on the padding response after multiple successive impacts. This study examined the recovery time for the padding in three youth football helmets and two adult lacrosse helmets. Helmets were impacted while being worn by an Anthropomorphic Test Device (ATD) with...

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