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Coercivity Enhancement And Gamma Phase Avoidance Of Alnico Alloys, Li Zhang 2016 University of Nebraska-Lincoln

Coercivity Enhancement And Gamma Phase Avoidance Of Alnico Alloys, Li Zhang

Engineering Mechanics Dissertations & Theses

The promotion of social progress requires greater levels of energy efficiency, quality and productivity. However, these developments usually come at the cost of the environment. Green technologies such as electric vehicles, wind turbine and solar panels are ironically overshadowed by supply limitations and high prices of rare earth elements. Therefore, it is important to find alternative materials to replace those that contain critical elements. Alnico alloys show high magnetization, high Curie temperature (800°C) and good corrosion resistance, making it one of the best candidates to replace neodymium-based magnets used in electric vehicles.

In this thesis, methods controlling shape anisotropy ...


Self-Patterning Of Epitaxial Ni-Mn-Ga/Mgo(001) Thin Films, B. Muntifering, W. B. Knowlton, P. Müllner 2016 Boise State University

Self-Patterning Of Epitaxial Ni-Mn-Ga/Mgo(001) Thin Films, B. Muntifering, W. B. Knowlton, P. Müllner

Peter Müllner

In this work, a detailed report on the growth of elongated bar-like crystallites with a definite crystallographic orientation, forming a self-organized patterned surface layer, with a thickness of about 100 nm, onto 900 nm thick ferromagnetic shape memory alloy Ni-Mn-Ga films epitaxially grown on MgO(001) is presented. The phenomenon appears above a threshold of lattice mismatch (≈2%) between the film and substrate. The structural, magnetic and transformation properties of such films are described and analyzed. Particularly, the different magnetic states of the two film layers are discerned by ferromagnetic resonance. The feasibility of creating a ferromagnetic shape memory alloy ...


Simulating Ut Measurements From Bolthole Cracks, Robert J. Grandin, Timothy A. Gray, Ronald A. Roberts 2016 Iowa State University

Simulating Ut Measurements From Bolthole Cracks, Robert J. Grandin, Timothy A. Gray, Ronald A. Roberts

Robert Grandin

Analytical computer models of UT measurements are becoming more prominent in evaluating NDEmethods – a process known as Model Assisted Probability of Detection, or MAPOD. As inspection requirements become more stringent, the respective models become more complex. An important application for aerospace structures involves inspection for cracks near boltholes in plate and layered structures. This paper describes a project to develop and validate analytical models for bolthole crackinspection, as well as to implement and demonstrate those models within an integrated graphical interface which can be used to simulate these inspections. The work involves a combination of approximate, paraxial, bulk-wave models as ...


Texture And Wettability Of Metallic Lotus Leaves, Christophe Frankiewicz, Daniel Attinger 2016 Iowa State University

Texture And Wettability Of Metallic Lotus Leaves, Christophe Frankiewicz, Daniel Attinger

Daniel Attinger

Superhydrophobic surfaces with the self-cleaning behavior of lotus leaves are sought for drag reduction and phase change heat transfer applications. These superrepellent surfaces have traditionally been fabricated by random or deterministic texturing of a hydrophobic material. Recently, superrepellent surfaces have also been made from hydrophilic materials, by deterministic texturing using photolithography, without low-surface energy coating. Here, we show that hydrophilic materials can also be made superrepellent to water by chemical texturing, a stochastic rather than deterministic process. These metallic surfaces are the first analog of lotus leaves, in terms of wettability, texture and repellency. A mechanistic model is also proposed ...


Kinetics Of Length Scale Dependent Deformation Of Gold Microspheres And Micropillars, A Z M Ariful Islam 2016 The University of Western Ontario

Kinetics Of Length Scale Dependent Deformation Of Gold Microspheres And Micropillars, A Z M Ariful Islam

Electronic Thesis and Dissertation Repository

In this thesis length and time scale dependence of the operative plastic deformation mechanisms in Au is studied. Uniaxial compression tests were performed at various loading rates on FIB-milled Au micropillars and single-crystalline Au microspheres of diameter ranging from 0.8 to 6.0 µm to investigate the incipient and bulk plasticity events. Constant-load ambient-temperature creep tests were performed on the micropillars to study the time-dependent plasticity at very slow strain rates. Uniaxial compression tests were also performed on coated Au microspheres to study the effect of extrinsic constraint on the deformation mechanisms.

During uniaxial compression, both the Au micropillars ...


Warning Systems Evaluation For Overhead Clearance Detection, Clayton Rogers 2016 Georgia Southern University

Warning Systems Evaluation For Overhead Clearance Detection, Clayton Rogers

Georgia Southern University Research Symposium

The accurate detection of road vehicle heights is a need that arises in departments of transportation across the nation. Usually, this dimension is required to solve various transportation issues. In particular, numerous bridges in the state of Georgia have been affected by repetitive crashes of tall vehicles against their structural elements. As an example, a recent inspection report of the Houlihan Bridge over the Savannah River documents damages resulting from numerous hits by overheight vehicles. This case emphasizes the urgency of finding preventive measures. To address this issue, a number of solutions are investigated. The known methods of vehicle height ...


Autonomous Methods In The Application Of Simple Swarm Capabilities, Joseph Watt III 2016 Georgia Southern University

Autonomous Methods In The Application Of Simple Swarm Capabilities, Joseph Watt Iii

Georgia Southern University Research Symposium

Swarm technology is a relatively new aspect to the drone industry. It involves multiple drones being able to communicate with each other and relay this back to the user. From this standpoint one operator can control all of them at once while only giving directions to one or more. This involves the use of different autonomous algorithms, similar to autopilot where programs fly the plane, that relay to one another on what adjustments to make or where to go. This idea is very useful in search and rescue operations where it might be too dangerous to insert a human. Also ...


Measuring Frequency Availability For Cognitive Radio Networks By Means Of Adaptive Threshold, Isaac Cushman 2016 Georgia Southern University

Measuring Frequency Availability For Cognitive Radio Networks By Means Of Adaptive Threshold, Isaac Cushman

Georgia Southern University Research Symposium

Radio Frequency spectrums designated by the FCC broadcast almost all mediums of communication, in both licensed and unlicensed bands, within the United States. As technology rapidly grows however, the availability of open frequencies will quickly decrease. Our goal is to design and experimentally test a system that allows for secondary users to access frequency bands that are not currently being optimally used by the primary users and also determine the effects of mobility on the ability for a sensor to accurately find frequencies by determining an appropriate power level for communication. We set up experimental scenarios in order to test ...


Emotion Recognition Using Fuzzy Clustering Analysis, Tejal Udhan 2016 Georgia Southern University

Emotion Recognition Using Fuzzy Clustering Analysis, Tejal Udhan

Georgia Southern University Research Symposium

This research project investigates using fuzzy clustering algorithms for emotion recognition. Emotion recognition has gained significant attention in recent years in applications such as artificial intelligence, human-computer interaction, speech and voice recognition. The ability of a computer or machine to understand human emotion and respond to users in a more human way can lead to significant advances in conversational speech recognition systems, improved quality of life in persons with speech disorders, such as Parkinson’s disease and even in voice response systems, such as Google Voice or Apple’s Siri. Experimental results in this area can inform discovery and innovation ...


Application Of Web Published Virtual Instruments In Delivering Engineering Instructions And Performing Experimental Research, Shahnam Navaee 2016 Georgia Southern University

Application Of Web Published Virtual Instruments In Delivering Engineering Instructions And Performing Experimental Research, Shahnam Navaee

Georgia Southern University Research Symposium

In this presentation the special utility of the LabVIEW Virtual Instruments published as HTML files is documented and discussed. The Virtual Instruments (LabVIEW programs) created using the software's web publishing tool can be used to complement the effectiveness of the classroom instructions and extend the reach of engineering researchers in more effectively conducting laboratory and field experimentation. The Virtual Instruments (VIs) created as web documents can be placed on a web-server and made available to users at remote locations. These files can enhance the collaborations and interactions among individuals at these stations. For example, the created VIs for a ...


Particle Boards Created From Modified Lignin, Robbie Kazen 2016 Georgia Southern University

Particle Boards Created From Modified Lignin, Robbie Kazen

Georgia Southern University Research Symposium

My name is Robert Kazen, a student directed under Dr. Rafael Quirino currently working on the Lignin Modification project. The research project involves the isolation of lignin from black liquor, a byproduct produced by the paper pulping industry. Isolated chemically the lignin was then modified using two methods, (1) acrylation acid and (2) transesterification with tung oil modifications. The black liquor obtained was sent by the Arizona Chemical and Herty Advanced Materials Development Center. Currently the tung oil modification gives the most valuable product physically and its products will be mainly used for particle board creation and testing. The tung ...


Carbon-Based Hierarchical Scaffolds For Myoblast Differentiation: Synergy Between Nano-Functionalization And Alignment, Akhil Patel, Shilpaa Mukundan, Wenhu Wang, Anil K. Karumuri, Vinayak Sant, Sharmila M. Mukhopadhyay, Shilpa Sant 2016 Wright State University - Main Campus

Carbon-Based Hierarchical Scaffolds For Myoblast Differentiation: Synergy Between Nano-Functionalization And Alignment, Akhil Patel, Shilpaa Mukundan, Wenhu Wang, Anil K. Karumuri, Vinayak Sant, Sharmila M. Mukhopadhyay, Shilpa Sant

Sharmila M. Mukhopadhyay

While several scaffolds have been proposed for skeletal muscle regeneration, multiscale hierarchical scaffolds with the complexity of extracellular matrix (ECM) haven’t been engineered successfully. By precise control over nano- and microscale features, comprehensive understanding of the effect of multiple factors on skeletal muscle regeneration can be derived. In this study, we engineered carbon-based scaffolds with hierarchical nano- and microscale architecture with controlled physico-chemical properties. More specifically, we built multiscale hierarchy by growing carbon nanotube (CNT) carpets on two types of scaffolds, namely, interconnected microporous carbon foams and aligned carbon fiber mats. Nanostructured CNT carpets offered fine control over nano-roughness ...


Creation And Implementation Of An Underwater-Capable Vr Headset Through The Use Of Additive Manufacturing, Matthew D. Meyers, Nathan Sonnenfeld 2016 ERAU

Creation And Implementation Of An Underwater-Capable Vr Headset Through The Use Of Additive Manufacturing, Matthew D. Meyers, Nathan Sonnenfeld

Human Factors and Applied Psychology Student Conference

No abstract provided.


A Numerical Approach To Investigate The Influence Of Deformable Blockages On Blood Flow In An Elastic Vessel, Tai-Hsien Wu 2016 Western Michigan University

A Numerical Approach To Investigate The Influence Of Deformable Blockages On Blood Flow In An Elastic Vessel, Tai-Hsien Wu

Research and Creative Activities Poster Day

In this work, we presented a new numerical approach to study the deformation of blockages and fluid properties in an elastic blood vessel. In computational hemodynamics, only few of the current numerical models considered the elasticity of vessels, and those models were difficult to extend to other topics like the deformation of blockages in elastic blood vessels. In addition, the approach that we employed is especially effective on visualization. A validation for the present method is carried out by comparing the simulation results with a theoretical prediction of the deformation of the pulmonary blood vessel in a steady flow. Subsequently ...


Molecular Combing Of Dna Nanofibers And Comparison To Electrospinning, Tanner L. Buresh 2016 University of Nebraska-Lincoln

Molecular Combing Of Dna Nanofibers And Comparison To Electrospinning, Tanner L. Buresh

UCARE Research Products

The goal of these experiments was to create DNA nanofibers through the method of molecular combing (MC) and then compare the MC fibers to fibers created with electrospinning (ES). The experiment was designed and initial samples were created. After confirming that the method would succeed in creating DNA fibers, several parametric studies were performed in order to optimize the experiment and create the most uniform fibers possible. The parametric studies were done on the following variables: substrate material, pH level of DNA solution, and DNA solution concentration. After completion of all experiments, it was determined that although fibers could be ...


Growth Of Ws2 Thin Photovoltaic Films, Matthew J. Hilfiker, Aaron Ediger, Natale lanno 2016 University of Nebraska - Lincoln

Growth Of Ws2 Thin Photovoltaic Films, Matthew J. Hilfiker, Aaron Ediger, Natale Lanno

UCARE Research Products

Through research for a material that is low cost, earth abundant, and highly efficient, Tungsten Sulfide (WS2) has been identified as a promising solution. From literature, it has been shown that WS2 possesses a band gap of 1.9 eV, which is ideal for a top layer heterostructure cell. While this is a favorable value, other properties needed to understand its value as a photovoltaic material are unknown. Through research, WS2 films will be grown through a sputtering deposition process and electrical characterization measurements will be performed to study these missing properties.


Optimization Of Process Parameters In Micro Electrical Discharge Machining (Edm) Of Ti-6al-4v Alloy, Farshid Alavi 2016 Western Kentucky University

Optimization Of Process Parameters In Micro Electrical Discharge Machining (Edm) Of Ti-6al-4v Alloy, Farshid Alavi

Masters Theses & Specialist Projects

Ti-6Al-4V has a wide range of applications such as in the automotive and aerospace industries. Nevertheless, titanium alloys are very difficult to machine by conventional methods. Micro-EDM is a non-conventional machining method that uses the thermal effect of precisely controlled sparks. Manufacturers are looking for the methods and optimal settings to increase the productivity of micro-EDM in terms of lessening machining time and tool wear. Moreover, surface integrity of the machined area is crucial for some products such as biomedical implants.

The objective of this study was to investigate the effects of the micro-EDM process parameters on response variables, in ...


Breakdown Voltage Performances Of Aluminum And Copper Conductor Wire Under Compression Stresses, Richard Donald Suchanek III 2016 Western Kentucky University

Breakdown Voltage Performances Of Aluminum And Copper Conductor Wire Under Compression Stresses, Richard Donald Suchanek Iii

Masters Theses & Specialist Projects

In the global, competitive market of energy transformation, increased operational expenses and depletion of raw materials have resulted in companies pursuing alternate materials to reduce consumer costs. In electrical applications, energy is transformed using materials with high electrical conductive properties. The conductive material used to transmit a signal is called conductor wire and is comprised of any material that has the ability to move charged particles from one point to another without propagation or delay. The conductor wire in many applications is encapsulated in epoxy resin called enamel. The enamel is the insulation system that provides necessary dielectric clearances to ...


Spin-Gapless Semiconductivity And Half Metallicity In Heusler Alloys, Bradley A. Staten 2016 University of Northern Iowa

Spin-Gapless Semiconductivity And Half Metallicity In Heusler Alloys, Bradley A. Staten

Research in the Capitol

In recent years, ever increasing interest in spin-based electronics (spintronics) has resulted in the search for a new class of materials that can provide a high degree of transport spin polarization. An ideal candidate would act like insulator for one spin channel and a conductor or semiconductor for the opposite spin channel (e.g. half metals (HM), spin gapless semiconductors (SGS)). In this work, we present results of our computational and theoretical study (Staten, et al., J. Appl. Phys. 117, 17D115 (2015)) of Heusler compounds with potential commercial applications in the field of spintronics. We show that naturally these materials ...


Second Order Phase Transition Temperature Of Single Crystals Of Gd5si1.3ge2.7 And Gd5si1.4ge2.6, Ravi Hadimani, Yevgen Melikhov, Deborah Schlagel, Thomas Lograsso, Kevin Dennis, R. William McCallum, David Jiles 2016 Iowa State University

Second Order Phase Transition Temperature Of Single Crystals Of Gd5si1.3ge2.7 And Gd5si1.4ge2.6, Ravi Hadimani, Yevgen Melikhov, Deborah Schlagel, Thomas Lograsso, Kevin Dennis, R. William Mccallum, David Jiles

Deborah L Schlagel

Gd5(Six Ge 1−x)4 has mixed phases in the composition range 0.32 < x < 0.41, which have not been widely studied. In this paper, we have synthesized and indexed single crystal samples of Gd5Si1.3 Ge 2.7 and Gd5Si1.4 Ge 2.6. We have investigated the first order and second orderphase transition temperatures of these samples using magnetic moment vs. temperature andmagnetic moment vs. magnetic field at different temperatures. We have used a modified Arrott plot technique that was developed and reported by us previously to determine the “hidden” second order phase transition temperature of the orthorhombic II phase.


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