Index Catalog // ScholarsArchive@OSU

Potential Additive-Manufacturing of Ablative Thermal Protection Systems

Creator:: Hazell, Kenya K.
Abstract:: Electrodeposition is a versatile polymer deposition technique to create nano-microscale materials using an electrical field generated from a charged droplet of solution and a grounded collector. Electrospinning or electrospraying can occur during electrodeposition, leading to the creation of nanofibers or bead-like materials depending on the process parameters. Photopolymerization of the...
Resource Type:: Dissertation
Full Text:: Kenya K. Hazell for the degree of Doctor of Philosophy in Materials Science presented on June 22, 2022

Selective laser melting of austenitic oxide dispersion strengthened steel: Processing, microstructural evolution and strengthening mechanisms

Creator:: Ghayoor, Milad, Lee, Kijoon, He, Yujuan, Chang, Chih-hung, Paul, Brian K., and Pasebani, Somayeh
Abstract:: Oxide dispersion strengthened (ODS) alloys exhibit superior mechanical properties due to the presence of nano-sized thermally stable oxide particles. However, manufacturing of ODS alloys is very complex and composed of numerous time consuming steps such as mechanical alloying, which is one of the main barriers toward the widespread application of...
Resource Type:: Article
Full Text:: Chang b, Brian K. Paul a,c, Somayeh Pasebani a,c,* a School of Mechanical, Industrial and

Numerical design of a high-flux microchannel solar receiver

Creator:: Rymal, Charles
Abstract:: This thesis discusses the design of several microchannel solar receiver devices for use in CSP (concentrated solar power) using CFD (computational fluid dynamics) simulations. The goal is to demonstrate that, by taking advantage of the higher heat transfer coefficienct of microchannels, solar receivers can achieve higher efficiency than current receiver...
Resource Type:: Masters Thesis
Full Text:: fluids. The required in- let and outlet temperatures of the fluid are 773 K and 923 K for carbon-dioxide

Practical Reinforcement Learning for Bipedal Locomotion

Creator:: Dao, Jeremy
Abstract:: Reinforcement learning has emerged as a popular tool for solving control tasks, with multiple works focusing on the complex and dynamic task of locomotion. However, the naive application of reinforcement learning to this problem often produces maladaptive policies that exploit the model or reward function. This results in behavior that...
Resource Type:: Capstone Project
Full Text:: gradient, we can just perform gradient ascent with some step size α and update the policy parameters: θk

Additive Manufacturing of FeCrCoCuNi High Entropy Alloy via Laser Powder Bed Fusion and Nickel Aluminum Bronze via Laser Directed Energy Deposition

Creator:: Doyle, Ryan P.
Abstract:: High Entropy Alloys (HEA) exhibit unusual properties and are gaining interest as new materials for challenging applications in the aerospace, hypersonic and medical fields. The application of HEAs have been limited by the development of powder production at scale. A recently developed process of plasma spheroidization by 6K, inc. has...
Resource Type:: Masters Thesis
Full Text:: . [12] Nene, S.S.; Frank, M.; Liu, K.; Sinha, S.; Mishra, R.S.; McWilliams, B.A.; Cho, K.C. Corrosion

Providing Informative Feedback for Learning in Tightly Coupled Multiagent Domains

Creator:: Rockefeller, Golden C.
Abstract:: Autonomous agents that sense, decide, act, and coordinate effectively with each other are critical in many real-world domains such as autonomous driving, search and rescue missions, air traffic management, and underwater or deep space exploration. All such domains share a key difficulty: though high-level mission goals are clear to system...
Resource Type:: Dissertation
Full Text:: algorithm for a multiagent system with n agents. Each agent evolves k policies. At the end of the episode

Numbering-Up of Microscale Devices for Megawatt-Scale Supercritical Carbon Dioxide Concentrating Solar Power Receivers

Creator:: Zada, Kyle R., Hyder, Matthew B., Drost, M. Kevin, and Fronk, Brian M.
Abstract:: Concentrated solar power (CSP) plants have the potential to reduce the consumption of nonrenewable resources and greenhouse gas emissions in electricity production. In CSP systems, a field of heliostats focuses solar radiation on a central receiver, and energy is then transferred to a thermal power plant at high temperature. However,...
Resource Type:: Article
Full Text:: K at Pressure up to 800 MPa,” J. Phys Chem. Ref. Data, 25(6). [30] Koşar, A., Mishra, C., and

Numbering-up of parallel microchannel arrays to megawatt scale supercritical CO₂ solar thermal receivers

Creator:: Hyder, Matthew B.
Abstract:: Concentrated solar power (CSP) plants have the potential to reduce the reliance on nonrenewable energies such as coal and natural gas and provide 24 hour, renewable electricity. A CSP system consists of a large field of heliostats that concentrate the sunlight on a centralized receiver, in this receiver a working...
Resource Type:: Masters Thesis
Full Text:: (kg m-2 s-1) GSolar Incident heat flux (W cm-2) h Heat transfer coefficient (W m-2 K-1) i

Performance enhancement of a thermally activated cooling system using microchannel heat exchangers

Creator:: Wang, Hailei and Peterson, Richard B.
Abstract:: In the current study a thermally activated cooling system that combines an ORC system with a vapor compression cooling cycle was developed and tested under laboratory conditions. This combined system can utilize waste heat or other thermal sources such as solar and geothermal to generate power and cooling. Hot oil...
Resource Type:: Article
Full Text:: Graetz number h convective heat transfer coefficient (W/m 2 -C) k thermal conductivity (W/m-C) m

Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide

Creator:: Hyder, Matthew B. and Fronk, Brian M.
Abstract:: Concentrated solar power (CSP) plants have the potential to provide 24 h, renewable electricity. Current CSP systems have high capital and operational costs which makes the levelized cost of electricity uncompetitive with conventional techniques. Recent experimental research has shown the potential of small unit cells (up to 2 × 2 cm) containing micropin arrays...
Resource Type:: Article

ScholarsArchive@OSU

Potential Additive-Manufacturing of Ablative Thermal Protection Systems

Selective laser melting of austenitic oxide dispersion strengthened steel: Processing, microstructural evolution and strengthening mechanisms

Numerical design of a high-flux microchannel solar receiver

Practical Reinforcement Learning for Bipedal Locomotion

Additive Manufacturing of FeCrCoCuNi High Entropy Alloy via Laser Powder Bed Fusion and Nickel Aluminum Bronze via Laser Directed Energy Deposition

Providing Informative Feedback for Learning in Tightly Coupled Multiagent Domains

Numbering-Up of Microscale Devices for Megawatt-Scale Supercritical Carbon Dioxide Concentrating Solar Power Receivers

Numbering-up of parallel microchannel arrays to megawatt scale supercritical CO₂ solar thermal receivers

Performance enhancement of a thermally activated cooling system using microchannel heat exchangers

Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide

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