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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
The flowfield of an impinging jet has many practical applications in engineering. One such application, the Short Take-Off and Vertical Landing (STOVL) aircraft, has motivated the current study. Many features characteristic of this...
Adaptive materials are typically known as materials that convert one form of energy into another. Well-known examples include ferroic materials (ferroelectric, ferromagnetic, shape memory alloys), dielectric elastomer, and azobenzene...
When driving on off road terrains, experienced drivers utilize driving rules that have been developed through experience to handle difficult driving conditions such as traversing soft terrains, descending steep hills, and traversing...
Wind-and-react coils using alumino-silicate insulated Bi2Sr2CaCu2Ox (Bi-2212) round wire consistently show reduced transport properties compared to short samples heat treated under identical conditions. To take full advantage of the Bi...
A device to measure bulk effective thermal conductivity of powder insulation at cryogenic temperatures has been designed and tested. The design consists of two concentric cylinders which are suspended inside of a cryostat. The insulation...
Energy crises have been a major problem in Pakistan for many years. The country, which became independent in 1947, has struggled to meet the gap between the demand and supply of electricity. The electricity demand, as in most countries, ...
The use of liquid desiccants for dehumidification of heating, ventilation, and air conditioning (HVAC) process air is becoming a more promising concept as the drive for energy conservation continues to grow. Recently, liquid desiccant...
At high angles of attack, asymmetric vortices are formed on the leeward side of flight vehicles with pointed forebodies due to the random surface imperfections near the forebody apex. These vortices induce adverse side forces and yaw...
High-speed impinging jets are often generated by the propulsive systems of aerospace launch vehicles and tactical aircraft. In many instances, the presence of these impinging jets creates a hazard for flight operations personnel due to...
Renewable energy sources are fundamental alternatives to supply the rising energy demand in the world and to reduce or replace fossil fuel technologies. In order to make renewable-based technologies suitable for commercial and industrial...
Short Take-Off and Vertical Landing (STOVL) aircraft achieve the required lift by vectoring thrust toward the ground. These jets impinging on the ground exhibit strong resonance induced by a feedback mechanism, consisting of downstream...
The semi-autonomous vehicle known as the Experimental Unmanned Vehicle (XUV)was designed by the US Army to autonomously navigate over different types of terrain. The performance of autonomous navigation improves when the vehicle's...
Wingtip vortices develop at the tips of aircraft wings due to a pressure imbalance during the process of generating lift. These vortices significantly increase the total aerodynamic drag of an aircraft at high-lift flight conditions such...
This thesis describes the development of a new piezohydraulic actuator for integration into a microjet flow control system. The piezohydraulic actuator utilizes a lead zirconate titanate (PZT) stack actuator and a hydraulic amplification...
In tokamak fusion reactors, such as ITER, superconducting strands are subjected to repeated Lorentz force loading and unloading which may degrade performance over time. In addition to Lorentz force when cooling from reaction heat...
Computational material modeling has a history supporting of engineering applications. This dissertation presents two focal areas of research. The first is modeling and characterizing ultrafast laser machining of sapphire. A three...
Out of the two most used materials (Nb3Sn and NbTi) for superconducting magnets, the Nb3Sn type conductor has been shown to have higher critical properties and capable to generate fields higher than 8 tesla. However, the superconducting...
The primary focus of the thesis is to understand the role of defects and interfaces in the deformation of nanoscale structures and systems. Various nanoscale systems such as symmetric tilt-grain boundaries (STGB) in aluminum, topological...
Inlets to aircraft propulsion systems must supply flow to the compressor with minimal pressure loss, flow distortion or unsteadiness. Flow separation in internal flows such as inlets and ducts in aircraft propulsion systems and external...
Solar thermal technology is competitive in some very limited markets. The most common use for solar thermal technology has been for water heating in sunny climates. Another use is for power production, such as the Vanguard system and the...
An electromagnetic launcher is a device used to accelerate projectiles at velocities exceeding those attained with conventional propelling systems. A magnetic field is generated when current is sent through two conductive rails that are...
Cobots are specially designed robots that use continuously variable transmissions (CVTs) instead of traditional motor driven joints. We believe that cobots are an attractive choice for telerobotic master controllers because they are safe...
The additional thrust required to accelerate a Short/Vertical Take-Off and Landing (S/VTOL) aircraft to flying speed within short distances can be obtained by channeling the engine exhaust through a thrust augmenting ejector. In order to...
Ceria and zirconia ceramics are well known for their ability to conduct oxygen ions, making them useful in constructing devices such as oxygen sensors and solid-oxide fuel cells. Increasing the ionic conductivity of these materials is a...
Understanding Slow Dynamics in Polymers Using Coarse-Grained Molecular Dynamics Simulations: Microphase Separation in Block Copolyelectrolytes and Photo-Switching in Azobenzene-Polymers
Tracking slow dynamics in polymers is very challenging using all-atomistic molecular dynamics simulations due to the vast range of time scales involved. Therefore, there are urgent needs to develop coarse-grained modeling schemes to meet...
Azobenzene liquid crystal polymers have emerged as a new type of adaptive material in recent years. The materials contain photo sensitive azobenzene mesogens that are embedded in the host polymer network which gives rise to unique field...
Fluid dynamic characterization of shock impingement on a flat surface has been studied extensively, whereas the material behavior induced by the shock has largely been ignored. The focus of this study is mainly on the material and...
Graphene based nanocomposites became the most popular research interest for researchers in the manufacturing of sensor and actuator devices because of their novel electrical and mechanical properties and very good piezoresistive behavior...
The characteristics of flow over an adverse pressure gradient, Stratford ramp, were experimentally investigated to characterize the nature of separation. The effect of microjet injection on the flow field was also explored for use as...
A major issue seen in Bi2Sr2CaCu2O8¬ (Bi-2212) conductor was leakage from the liquid within the wire during the partial (peritectic) melt. The leakage in the wire was the main focus of this work initially. By examining leaked wire, ...
Autonomous robots are increasingly working alongside humans in a variety of environments. While simple applications in controlled environments work fine with fully autonomous robots and little interaction between human and robot, mission...
Unsteady fluid flows have complex dynamics due to the nonlinear interactions amongst vortical elements. In this thesis, a network-theoretic framework is developed to describe vortical and modal (coherent structure) interactions in...
The deployment of high flux magnetic processing in industry requires the ability to model the expected results of a proposed processing, and the current assumptions in the literature did not reflect the actual outcome in measurements of...
A two-part experimental study was conducted in order to investigate and then reduce the noise generated by high-temperature supersonic jets. The first part of the study focused on the noise generated by supersonic jets at Mach numbers...
This dissertation considers the problem of optimal task allocation for heterogeneous teams, e.g., teams of heterogeneous robots or human-robot teams. It is well known that this problem is NP hard and hence computationally feasible...
Composite additive manufacturing (AM) is able to create products that have never before been able to be made. However, several processing and material setbacks keep AM from becoming the all-encompassing methodology for multifunctional...
This dissertation describes the propagation of near atmospheric nitrogen gas that rushes into a liquid helium cooled vacuum tube after the tube suddenly loses vacuum. The loss-of-vacuum scenario resembles accidental venting of...
Electromagnets are an important application of superconductivity as superconductors can provide large current density in the winding pack without any voltage drop or joule heating losses. High temperature superconducting (HTS) magnets...
This work presents two novel use cases to study domain applications of Sampling-Based Model Predictive Optimization (SBMPO). In the first case study, SBMPO is demonstrated to provide computationally efficient, direct generation of...
Superfluid helium (He II) contained in porous media is examined. In particular, heat transfer experiments were performed on He II contained in random packs of uniform size polyethylene spheres. Measured results include the steady state...
Robotic-Assisted Additive Manufacturing (RAAM) represents the cutting-edge of modern manufacturing, holding the potential to revolutionize production processes by seamlessly integrating contemporary sensing techniques for real-time data...
Hyperthermia has been gaining a lot of interest recently as a method for curing cancer especially as an adjunct to other modalities such as Radiotherapy and Chemotherapy. Hyperthermia can be effected by heating magnetic nanoparticles...
Autonomous ground vehicles (AGVs) are commonly used for search and rescue, military and forestry purposes. To safely and efficiently perform missions in these environments the AGV must adapt its driving and control strategies based on...
In response to the increasing demand for jet noise studies performed at realistic conditions, the Florida Center For Advanced Aero-Propulsion at Florida State University has recently brought online an upgraded Anechoic High-Temperature...
This dissertation introduces a comprehensive model for a single solid oxide fuel cell (SOFC) as well as a procedure to optimize its configuration and operating condition, so that the net power is maximized. The model consists of coupled...
This dissertation presents a contribution to understanding the behavior of solar powered air conditioning and refrigeration systems with a view to determining the manner in which refrigeration rate; mass flows, heat transfer areas, and...
Many animals are capable of jumping from a running gait. This allows them to quickly overcome a large range of obstacles. A robotic platform capable of running jumps will benefit similarly, and see a great enhancement to its mobility....
The search for viable forms of alternative energy has been a topic of recent research, and harvesting of solar energy has already been realized in various forms. Certain compounds have been shown to have visible physical responses when...
There is a growing interest in fuel cells for hybrid system. Fuel cells when combined with conventional turbine power plants offer high fuel efficiencies. The feature of certain fuel cells (SOFC, MCFC), which makes them suitable for...
The supersonic impinging jet flowfield has many applications in engineering including Short Take-Off and Vertical Landing (STOVL) aircraft, which will be the primary application considered in this paper. Supersonic impinging jets...
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
