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- Member of: ASU Electronic Theses and Dissertations
Description
This report presents the effects and analysis of the effects of Pulsed-Gas Metal Arc Welding's (P-GMAW) on Lean Duplex stainless steel. Although the welding of Duplex and Super Duplex Stainless steels have been well documented in both the laboratory and construction industry, the use of Lean Duplex has not. The purpose for conducting this research is to ensure that the correct Ferrite-Austenite phase balance along with the correct welding procedures are used in the creation of reactor cores for new construction nuclear power generation stations. In this project the effects of Lincoln Electrics ER-2209 GMAW wire are studied. Suggestions and improvements to the welding process are then proposed in order to increase the weldability, strength, gas selection, and ferrite count. The weldability will be measured using X-Ray photography in order to determine if any inclusions, lack of fusion, or voids are found post welding, along with welder feedback. The ferritic point count method in accordance with ASTM A562-08, is employed so that the amount of ferrite and austenite can be calculated in the same manor that is currently being used in industry. These will then be correlated to the tensile strength and impact toughness in the heat-affected zone (HAZ) of the weld based on the ASTM A923 testing method.
ContributorsCarter, Roger (Author) / Rogers, Bradley (Thesis advisor) / Gintz, Jerry (Committee member) / Georgeou, Trian (Committee member) / Arizona State University (Publisher)
Created2012
Description
Ophthalmoscopes are integral to diagnosing various eye conditions; however, they often come at a hefty cost and are not generally portable, limiting access. With the increase in the prevalence of smart devices and improvements to their imaging capabilities, these devices have the potential to benefit areas where specialized imaging infrastructure is not well established. Smart device cameras alone cannot replace an ophthalmoscope. However, with the addition of lens and optics, it becomes possible to take diagnostic quality images. The goal is to design a modular system that acts as an adapter to a smart device enabling any user to take retinal images and corneal images with little to no previous experience. The device should be cost-effective, reliable, and easy to use. The device is not meant to replace conventional funduscopes but acts in areas where current units fail. Applications in non-optimal settings, low resource areas, or areas that currently receive suboptimal care due to geographic or socioeconomic barriers are examples where this device could be used. The introduction of screening programs run by nonspecialized medical personnel with devices that can capture and transmit quality eye images minimizes the long-term complications of degenerative eye conditions.
ContributorsSpyres, Dean (Author) / McDaniel, Troy (Thesis advisor) / Patel, Dave (Committee member) / Gintz, Jerry (Committee member) / Arizona State University (Publisher)
Created2022
Description
As industries advance and automation becomes more prevalent, it is vital that safety remains at the forefront of discussions. To support this, Risk Management
standards have been developed and adopted for both North American and International
markets. Additionally, technical documents have been published to streamline risk
management processes. Part of these emerging technologies includes Collaborative
robots, each with specific methods tailored to their capabilities. These standards offer
guidance not only to end-users but also to Robot manufacturers, ensuring adherence to
safety standards and providing methods for risk mitigation. The risk levels and categories
are organized in a hierarchical structure, ranging from the most severe to negligible.
Under these standards, the process involves identifying risks, mitigating them, validating
the mitigation through verification, and solidifying the results. As technologies continue
to evolve, it is essential for standards to evolve accordingly to ensure optimal safety
levels when implemented correctly. Having effective risk management in place for all
Industrial Robot Systems is paramount to reduce liability and protect both operators and
assets. Detail key standards are that govern the realm of industrial robot systems for both
north America and the rest if the world as well as highlight robot manufacturers
adherence to the standards, response to safety, and how risk management can be applied.
ContributorsHall, Ammon (Author) / Gintz, Jerry (Thesis advisor) / Sugar, Thomas (Committee member) / Dehghan-Niri, Ehsan (Committee member) / Arizona State University (Publisher)
Created2024
Description
There has been considerable advancement in the algae research field to move algae production for biofuels and bio-products forward to become commercially viable. However, there is one key element that humans cannot control, the natural externalities that impact production. An algae cultivation system is similar to agricultural crop farming practices. Algae are grown on an area of land for a certain time period with the aim of harvesting the biomass produced. One of the advantages of using algae biomass is that it can be used as a source of energy in the form of biofuels. Major advances in algae research and development practices have led to new knowledge about the remarkable potential of algae to serve as a sustainable source of biofuel. The challenge is to make the price of biofuels from algae cost-competitive with the price of petroleum-based fuels. The scope of this research was to design a concept for an automated system to control specific externalities and determine if integrating the system in an algae cultivation system could improve the algae biomass production process. This research required the installation and evaluation of an algae cultivation process, components selection and computer software programming for an automated system. The results from the automated system based on continuous real time monitored variables validated that the developed system contributes insights otherwise not detected from a manual measurement approach. The implications of this research may lead to technology that can be used as a base model to further improve algae cultivation systems.
ContributorsPuruhito, Emil (Author) / Sommerfeld, Milton (Thesis advisor) / Gintz, Jerry (Thesis advisor) / Alford, Eddie (Committee member) / Arizona State University (Publisher)
Created2014