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M5Si3(M=Ti, Nb, Mo) Based Transition-Metal Silicides for High Temperature Applications

Description: Transition metal silicides are being considered for future engine turbine components at temperatures up to 1600 C. Although significant improvement in high temperature strength, room temperature fracture toughness has been realized in the past decade, further improvement in oxidation resistance is needed. Oxidation mechanism of Ti{sub 5}Si{sub 3}-based alloys was investigated. Oxidation behavior of Ti{sub 5}Si{sub 3}-based alloy strongly depends on the atmosphere. Presence of Nitrogen alters th… more
Date: December 1, 2007
Creator: Tang, Zhihong
Partner: UNT Libraries Government Documents Department
open access

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements

Description: Materials for high-pressure turbine blades must be able to operate in the high-temperature gases (above 1000 C) emerging from the combustion chamber. Accordingly, the development of nickel-based superalloys has been constantly motivated by the need to have improved engine efficiency, reliability and service lifetime under the harsh conditions imposed by the turbine environment. However, the melting point of nickel (1455 C) provides a natural ceiling for the temperature capability of nickel-base… more
Date: December 1, 2007
Creator: Mu, Nan
Partner: UNT Libraries Government Documents Department
open access

TRISO Fuel Performance: Modeling, Integration into Mainstream Design Studies, and Application to a Thorium-fueled Fusion-Fission Hybrid Blanket

Description: This study focused on creating a new tristructural isotropic (TRISO) coated particle fuel performance model and demonstrating the integration of this model into an existing system of neutronics and heat transfer codes, creating a user-friendly option for including fuel performance analysis within system design optimization and system-level trade-off studies. The end product enables both a deeper understanding and better overall system performance of nuclear energy systems limited or greatly imp… more
Date: November 28, 2011
Creator: Powers, J J
Partner: UNT Libraries Government Documents Department
open access

Error Detection, Factorization and Correction for Multi-View Scene Reconstruction from Aerial Imagery

Description: Scene reconstruction from video sequences has become a prominent computer vision research area in recent years, due to its large number of applications in fields such as security, robotics and virtual reality. Despite recent progress in this field, there are still a number of issues that manifest as incomplete, incorrect or computationally-expensive reconstructions. The engine behind achieving reconstruction is the matching of features between images, where common conditions such as occlusions,… more
Date: November 10, 2011
Creator: Hess-Flores, M.
Partner: UNT Libraries Government Documents Department
open access

Combustion in Homogeneous Charge Compression Ignition Engines: Experiments and Detailed Chemical Kinetic Simulations

Description: Homogeneous charge compression ignition (HCCI) engines are being considered as an alternative to diesel engines. The HCCI concept involves premixing fuel and air prior to induction into the cylinder (as is done in current spark-ignition engine) then igniting the fuel-air mixture through the compression process (as is done in current diesel engines). The combustion occurring in an HCCI engine is fundamentally different from a spark-ignition or Diesel engine in that the heat release occurs as a g… more
Date: June 7, 2002
Creator: Flowers, D L
Partner: UNT Libraries Government Documents Department
open access

Lasershot peening--a means to strengthen metals

Description: Lasershot peening is an emerging modern process that impresses a compressive stress into the surfaces of metals, improving their operational lifetime. Almost everyone is familiar with taking a strip of metal or a wire and bending it multiple times until it breaks. In this situation, when the metal is bent, the surface of outer radius is stretched into a tensile state. Under tension, any flaw or micro-crack will grow in size with each bending of the metal until the crack grows through the entire… more
Date: March 1, 2000
Creator: Chen, H. L.
Partner: UNT Libraries Government Documents Department
open access

Preliminary Analysis of an Innovative Rotary Displacer Stirling Engine

Description: Stirling engines are an external combustion heat engine that converts thermal energy into mechanical work that a closed cycle is run by cyclic compression and expansion of a work fluid (commonly air or Helium) in which, the working fluid interacts with a heat source and a heat sink and produces network. The engine is based on the Stirling cycle which is a subset of the Carnot cycle. The Stirling cycle has recently been receiving renewed interest due to some of its key inherent advantages. In p… more
Date: December 2015
Creator: Bagheri, Amirhossein
Partner: UNT Libraries
open access

The application of solid-state NMR spectroscopy to electrochemical systems: CO adsorption on Pt electrocatalysts at the aqueous-electrode interface

Description: A fuel cell is an electrochemical energy conversion device, the continuous-flow analogue of the popular electrochemical storage device known as the battery. While the potential of fuel cells as power sources was recognized well over a century ago, they have since found limited application; a myriad of chemical, engineering and materials issues can be cited for this disappointing showing. Recent growing concern over the fate of the environment, however, has helped to renew interest in fuel cell … more
Date: December 1, 1996
Creator: Yahnke, M. S.; Reimer, J. A. & Cairns, E. J.
Partner: UNT Libraries Government Documents Department

Characterization, Analysis, and Optimization of Rotary Displacer Stirling Engines

Description: This work focuses on an innovative Rotary Displacer SE (RDSE) configuration for Stirling engines (SEs). RDSE features rotary displacers instead of reciprocating displacers (found in conventional SE configurations), as well as combined compression and expansion spaces. Guided by the research question "can RDSE as a novel configuration achieve a higher efficiency compared to conventional SE configurations at comparable operating conditions?", the goal of this study is to characterize, analyze, an… more
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Date: December 2019
Creator: Bagheri, Amirhossein
Partner: UNT Libraries
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