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Articles 1 - 10 of 10
Full-Text Articles in Mechanical Engineering
Atomic-Scale Analysis Of Solute Segregation Energy Into Grain Boundaries And Polycrystals, Tara Nenninger
Atomic-Scale Analysis Of Solute Segregation Energy Into Grain Boundaries And Polycrystals, Tara Nenninger
Graduate College Dissertations and Theses
Solute segregation in grain boundaries (GBs) is used in design to stabilize nanocrystalline alloys. While analyzing GB segregation energy as a spectrum allows for a more in-depth analysis of the effects of GB atomic structure on solute segregation, this method inherently ignores solute-solute interaction by nature of considering one solute at a time. Here we develop an efficient molecular statics (MS) algorithm for determining the local effect of solute-solute interaction on GB segregation. We apply this algorithm to a Σ9 (221) symmetric tilt grain boundary in a bicrystal as well as a randomly oriented polycrystal for Ni and Cu solutes …
Emergence Of Elasto-Inertial Turbulence In 2d Natural Convection Flow With Polymer Additives, Fuqian Yin
Emergence Of Elasto-Inertial Turbulence In 2d Natural Convection Flow With Polymer Additives, Fuqian Yin
Graduate College Dissertations and Theses
Elasto-Inertial Turbulence (EIT) is a recently discovered state of chaos triggered by the addition of polymers in a liquid flow. Its presence in wall-bounded parallel flows, pipe and channel flows, has been well-established. The present research investigates the existence of EIT in large circulations, specifically the Rayleigh-B\'{e}nard cells (RBC) caused by natural convection between two horizontal plates with a negative temperature gradient. The method of investigation is high-fidelity two dimensional direct numerical simulation of the constitutive polymer model FENE-P. The flow parameter space is mostly subcritical, characterized by $Ra$, Rayleigh number, below or equal to $10^6$, which loosely defines the …
Active Acoustic Sensing Technologies For Practical Uav-Based Condition Assessment Of Underside Bridge Decks, Damien Garland
Active Acoustic Sensing Technologies For Practical Uav-Based Condition Assessment Of Underside Bridge Decks, Damien Garland
Graduate College Dissertations and Theses
Reinforced concrete bridge decks are high performance structural elements that must survive decades of harsh mechanical and environmental loads. The structural health monitoring of bridges is a primary enabler of safe and cost-effective performance, relying on frequent inspections and repairs as needed. The undersides of concrete bridge decks are oft-overlooked areas of inspection, owing to a hard to reach and difficult location to access. Exacerbating factors to the degradation of concrete bridge decks are the freeze-thaw cycle and salt water related corrosion common in the world’s Northern climates. As concrete weathers, it decays. Corrosion induced cracking and delamination are primary …
Pymoocfd - A Multi-Objective Optimization Framework For Cfd, George Martin Cunningham Love
Pymoocfd - A Multi-Objective Optimization Framework For Cfd, George Martin Cunningham Love
Graduate College Dissertations and Theses
Modern computational resource have solidified the use of computer modeling as an integral part of the engineering design process. This is particularly impressive when it comes to high-dimensional models such as computational fluid dynamics (CFD) models. CFD models are now capable of producing results with a level of confidence that would previously have required physical experimentation. Simultaneously, the development of machine learning techniques and algorithms has increased exponentially in recent years. This acceleration is also due to the widespread availability of modern computational resources. Thus far, the cross-over between these fields has been mostly focused on computer models with low …
On The Enhancement Of Penetrating Radar Target Location Accuracy With Visual-Inertial Slam, Joshua Girard
On The Enhancement Of Penetrating Radar Target Location Accuracy With Visual-Inertial Slam, Joshua Girard
Graduate College Dissertations and Theses
This paper presents research concerning the use of visual-inertial Simultaneous Localization And Mapping (SLAM) algorithms to aid in Continuous Wave (CW) radar target mapping. SLAM is an established field in which radarhas been used to internally contribute to the localization algorithms. Instead, the application in this case is to use SLAM outputs to localize radar data and construct three-dimensional target maps which can be viewed in augmented reality. These methods are transferable to other types of radar units and sensors, but this paper presents the research showing how the methods can be applied to calculate depth efficiently with CW radar …
Medical Applications Of Ultrasound: T-Cell Drug Delivery, Osteoporosis Diagnosis, And Biofilm Mitigation, Alina Karki
Medical Applications Of Ultrasound: T-Cell Drug Delivery, Osteoporosis Diagnosis, And Biofilm Mitigation, Alina Karki
Graduate College Dissertations and Theses
The ability of ultrasound to localize acoustic energy deposition and induce a biological effect within a target is examined in three novel biomedical applications: sonoporation, osteoporosis diagnosis, and biofilm mitigation.Ultrasound can excite encapsulated microbubbles, causing an acoustic cavitation effect in the vicinity of cells, temporarily increasing membrane permeability, and allowing cells to uptake foreign molecules. This non-viral transfection technique is called sonoporation. Our experimental study demonstrated that it could be effective for small interfering RNA (siRNA) delivery into an isolated mouse and human T-cells, which is a complex process despite its importance in treating numerous diseases. T-cells are non-proliferating, while …
The Optimization Of Rifle Barrel Harmonics, Daniel O'Neil
The Optimization Of Rifle Barrel Harmonics, Daniel O'Neil
Graduate College Dissertations and Theses
From the optimization of mechanical systems perspective, firearms offer a plethora of complex scenarios. Many variables, coupled with sometimes unstable systems, must be balanced appro- priately by the user to achieve precision, that is to say, to hit the target bullseye from some distance away with a small projectile launched on a parabolic trajectory. The sources of error entirely affect final terminal precision, some of them related to human factors, others related to the quality of the ammunition, and the remaining associated with the mechanical capability of the weapon. This thesis documents the vibrations analysis of an isolated rifle barrel, …
Constraint-Aware And Efficiency-Aware Control Of Air-Path In Fuel Cell Vehicles, Eli Bacher-Chong
Constraint-Aware And Efficiency-Aware Control Of Air-Path In Fuel Cell Vehicles, Eli Bacher-Chong
Graduate College Dissertations and Theses
Fuel cell technology offers the potential for clean, efficient, robust energy productionfor both stationary and mobile applications. But without fast and robust control systems, fuel cells cannot hope to maintain real-life efficiencies near enough to their theoretical potential. This work studies control and constraint management techniques to regulate a nonlinear multivariable air-path system for a proton exchange membrane fuel cell (PEMFC). The control objectives are to avoid oxygen starvation, run at the maximum net efficiency, achieve fast tracking of air flow and pressure set-points, and be easy to calibrate. To operate at maximum efficiency, a set-point map is generated for …
Finite Element Deformation Of Silver Nanowire Networks, Akiva Gopalkrishnan
Finite Element Deformation Of Silver Nanowire Networks, Akiva Gopalkrishnan
Graduate College Dissertations and Theses
Tin doped Indium oxide currently is the dominant material used in the field of transparent electronics (TE) but suffers from Indium scarcity and brittle failure under small deformations. Silver Nanowires (AgNWs) are of considerable research interest due to their relative ease of fabrication, high conductivity, and mechanical ductility, as well as high corrosion stability. Existing research on single AgNWs via nanomechanical testing has shown an increase in the strength and ductility as both the diameter and gauge length is reduced, or a “smaller is stronger effect”. The formation of a network structure of AgNWs on flexible plastic substrates is essential …
Chitosan-Based Shrinking Fibers For Post-Cure Stressing To Increase Durability Of Concrete, Diarmuid Gregory
Chitosan-Based Shrinking Fibers For Post-Cure Stressing To Increase Durability Of Concrete, Diarmuid Gregory
Graduate College Dissertations and Theses
Concrete is a ubiquitous building material with an extensive history, yet it has a fair number of imperfections. Its sizeable environmental impact, low tensile to com- pressive strength ratio, and lack of durability leave room for innovation. Concrete durability frames the motivation for this research.This thesis presents the motivation, methods, and findings of tests performed to quantify the durability of concrete reinforced with automatically shrinking chitosan- based fibers. A literature review, the procedures for synthesizing chitosan fibers, and preliminary tests of the control fibers are all discussed. Two different types of durability tests were carried out: rapid freezing and thawing …