Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Brigham Young University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 451 - 480 of 4850

Full-Text Articles in Engineering

Early Life Drift And Environmental Effects In Nanocomposite Sensors For Biomechanics Applications, Jacob D. Carter Aug 2023

Early Life Drift And Environmental Effects In Nanocomposite Sensors For Biomechanics Applications, Jacob D. Carter

Theses and Dissertations

Wearable nanocomposite strain sensors are a promising technological advancement for real-time monitoring of human biomechanics. However, characterization of these sensors for biomechanical use can be complex due to factors such as creep-related resistance drift and environmental influence (humidity and temperature). The purpose of this work is to investigate and quantify these factors as well as seek to mitigate their effects. The first portion of this thesis is a study on creep-related drift of the electrical behavior of the sensors, investigating the impact of material cure levels and application of a compressive prestrain in ameliorating the observed drift. DSC testing of …

Go to article

Enhancing Local Hydrological Services With The Geoglows Ecmwf Global Hydrologic Model, Jorge Luis Sanchez Lozano Aug 2023

Enhancing Local Hydrological Services With The Geoglows Ecmwf Global Hydrologic Model, Jorge Luis Sanchez Lozano

Theses and Dissertations

Global hydrological models can fill crucial gaps for providing essential information on water resources management, flood and drought forecasting, and assessing the impacts of climate change. However, these models face several challenges that must be addressed to ensure their applicability at local scales. These challenges include effectively managing Big Data, proper communication, adoption, and achieving accuracy in their results. Achieving accuracy in global hydrological models is critical for acceptance in decision-making, but poses the most significant challenge due to the extensive amount of observed data required and the complexity of obtaining and preparing such data for model evaluation. In this …

Go to article

Real-Time Spatial Interference Removal And Maximum Ratio Combining In Communication Systems, Adam Gary Whipple Aug 2023

Real-Time Spatial Interference Removal And Maximum Ratio Combining In Communication Systems, Adam Gary Whipple

Theses and Dissertations

Radio frequency interference (RFI) is undesired and commonplace. Using a subspace projection method to spatially remove the interference from a phased array system gives results of a 30 dB interference null rejection (INR). Unmanned systems have been developed to observe underwater activity and communicate their observations to passing aircraft. These systems are currently limited by their use of a single transmitter. The uplink can be improved by using a dual-antenna beam steering approach to maximize the signal-to-noise ratio (SNR) the aircraft receives. This approach demonstrates an increase in SNR of 3 dB when compared to a single transmitter.

Go to article

Numerical Evaluation Of Forces Affecting Particle Motion In Time-Invariant Pressurized Jet Flow, Donald E. Peterson Aug 2023

Numerical Evaluation Of Forces Affecting Particle Motion In Time-Invariant Pressurized Jet Flow, Donald E. Peterson

Theses and Dissertations

This work evaluates the relative significance of forces determining the motion of a pulverized coal particle under conditions representative of a pressurized oxy-coal combustor. The gravity force and surface forces of drag, fluid stress, added mass, and Basset history are discussed and appropriate forms of these force equations are chosen, with a consideration of spherical and non-spherical drag and the Basset history kernel. Studies from the literature that emphasize specific forces are used to validate the implementation of the force equations and correlations. Modeling is based on time-averaged, one-dimensional motion of a single non-reacting particle along the centerline of a …

Go to article

Indirect Tensile Strength Of Clayey Soils Treated With Cement Or Lime, Melissa Adams Cowley Aug 2023

Indirect Tensile Strength Of Clayey Soils Treated With Cement Or Lime, Melissa Adams Cowley

Theses and Dissertations

The objectives of this research were to evaluate the sensitivity of indirect tensile strength (ITS) test results to stabilizer type, stabilizer concentration, and curing time for multiple clayey soils with varying plasticity indices (PIs), identify cases in which an ITS of 30 psi can be obtained, and create a general linear model that predicts ITS. The scope of work included laboratory testing of three clayey soils sampled from Monticello, Utah; Bloomington, Indiana; and San Antonio, Texas. Each soil was tested using two stabilizers, cement or lime, at three concentrations, and two replicate samples were prepared for each combination. ITS testing …

Go to article

Continuous-Time Trajectory Estimation And Its Application To Sensor Calibration And Differentially Flat Systems, Jacob C. Johnson Aug 2023

Continuous-Time Trajectory Estimation And Its Application To Sensor Calibration And Differentially Flat Systems, Jacob C. Johnson

Theses and Dissertations

State estimation is an essential part of any robotic autonomy solution. Continuous-time trajectory estimation is an attractive method because continuous trajectories can be queried at any time, allowing for fusion of multiple asynchronous, high-frequency measurement sources. This dissertation investigates various continuous-time estimation algorithms and their application to a handful of mobile robot autonomy and sensor calibration problems. In particular, we begin by analyzing and comparing two prominent continuous-time trajectory representations from the literature: Gaussian processes and splines, both on vector spaces and Lie groups. Our comparisons show that the two methods give comparable results so long as the same measurements …

Go to article

A Polarizable Molecular Dynamics Potential For Molten Salt Property Prediction, Jared Thurgood Aug 2023

A Polarizable Molecular Dynamics Potential For Molten Salt Property Prediction, Jared Thurgood

Theses and Dissertations

The present study attempts to find an alternate computational tool to model the complex physical interactions within the molten salt FLiNaK in a way that is both efficient and accurate. Additionally, this study seeks to describe the effects of several different types of impurities on the FLiNaK salt system. This study selects two different polarizable force fields, the AMOEBA polarizable approach and the polarizable ion model, to determine the density and the structure of the impure FLiNaK salt mixtures at typical operating temperatures in molten salt reactors (between 500-900 °C). This study conducts ab initio molecular dynamics (AIMD) simulations and …

Go to article

Experimental Characterization Of Internal Wave Generation By Multiple Ridge Topographies, Natasha J. Wilson Aug 2023

Experimental Characterization Of Internal Wave Generation By Multiple Ridge Topographies, Natasha J. Wilson

Theses and Dissertations

Internal waves are three dimensional waves that occur in stratified fluids, where density increases with depth, such as the ocean and atmosphere. In the oceans, internal waves are continuously generated by tidal flow over subsea topography. The size and shape of the topography, as well as the stratification relative to the oscillation frequency influence the characteristics of the generated internal wave field. To advance the current understanding of how ridges on a subcritical topography changes the internal waves generated, four symmetric topographies are used with ridge numbers ranging from three to six. An additional single ridge topography is used, as …

Go to article

Deployable Mechanisms And Applications For Minimally Invasive Surgery, Jacob L. Sheffield Aug 2023

Deployable Mechanisms And Applications For Minimally Invasive Surgery, Jacob L. Sheffield

Theses and Dissertations

This thesis explores techniques to utilize deployable, developable, and compliant mechanism design principles while investigating applications for minimally invasive surgery. This work also examines contemporary outreach strategies to broaden awareness and expand dissemination avenues of engineering research. The outcomes of this research aim to (i) equip product designers with machine design tools, (ii) deliver background and designs to mitigate surgical frustration and procedure complications associated with obstructed laparoscope lenses during laparoscopic surgery, and (iii) provide engineering researchers with new tools to extend the impact of their research. Part one of this work (Chapter 2) introduces methods for embedding linear-motion mechanisms …

Go to article

Electroplating And Machining Of Silicon Carbide Wafers, Madeline Beth Thompson Aug 2023

Electroplating And Machining Of Silicon Carbide Wafers, Madeline Beth Thompson

Theses and Dissertations

Silicon carbide has many properties that make it a promising and desirable material for diverse applications. One such application for silicon carbide wafers is as a transparent cryogenic probe card. This thesis briefly describes the design of a probe card based on a silicon carbide wafer substrate. It includes a description of electroplating fundamentals and demonstrates the feasibility of electroplating copper onto a wafer for the formation of bond pads between the substrate and external PCB ring. The process for electroplating copper with good adhesion and quality based on metal alloy formation, current control, and materials selection is outlined. Results …

Go to article

Lumbar Skin Strain Fields In The Context Of Skin Adhered Wearables, Andrew Kent Gibbons Aug 2023

Lumbar Skin Strain Fields In The Context Of Skin Adhered Wearables, Andrew Kent Gibbons

Theses and Dissertations

A comprehensive background is herein presented for lumbar skin strain and its effect on skin adhered wearable (SAW) products. A background of the development of computational models of the interaction of skin and novel SAWs being researched is also presented. These include products involving the use of high deflection strain gauges to measure skin strain during functional movements (FMs) as a method to address the complicated phenotyping of the etiological causes of low back pain (LBP). The background concludes with the mathematical calculation of the principal skin strain magnitudes and orientations using retroreflective marker coordinate data in a motion capture …

Go to article

3rd Party Ip Encryption From Netlist To Bitstream For Xilinx 7-Series Fpgas, Daniel Hutchings Aug 2023

3rd Party Ip Encryption From Netlist To Bitstream For Xilinx 7-Series Fpgas, Daniel Hutchings

Theses and Dissertations

IP vendors need to keep the internal designs of their IP secret from the IP user for security or commercial reasons. The CAD tools provided by FPGA vendors have some built-in functionality to encrypt the IP. However, the IP is consequently decrypted by the CAD tools in order to run the IP through the design flow. An IP user can use APIs provided by the CAD tools to recreate the IP in an unencrypted state. An IP user could also easily learn the internals of a protected IP with the advent of new open-source bitstream to netlist tools. The user …

Go to article

Determination Of A Surrogate For Plutonium Electrorefining, Greg Chipman, Bryant Johnson, Suhee Choi, Chao Zhang, Michael Simpson, Devin Rappleye Aug 2023

Determination Of A Surrogate For Plutonium Electrorefining, Greg Chipman, Bryant Johnson, Suhee Choi, Chao Zhang, Michael Simpson, Devin Rappleye

Faculty Publications

Conducting research experiments on plutonium electrorefining is difficult due to the significant hazards and regulations associated with nuclear materials. Finding a surrogate for plutonium electrorefining studies would enable more fundamental research to be conducted. Potential surrogates were first identified by determining the physical properties required to conduct electrorefining at the same conditions commonly used in plutonium electrorefining, a molten metal and molten CaCl2 at 1123 K. Ce-CeCl3, In-InCl3, and Pb-PbCl2 were the only potential surrogates identified using these constraints. Sn-SnCl2 was also tested at these same conditions. More potential surrogates were identified by …

Go to article

Side-Channel Leakage From The Advanced Encryption Standard On Field Programmable Gate Arrays, Kaden Makechnie-Hardy Aug 2023

Side-Channel Leakage From The Advanced Encryption Standard On Field Programmable Gate Arrays, Kaden Makechnie-Hardy

Undergraduate Honors Theses

As field programmable gate arrays (FPGAs) perform increasingly critical cryptography, researchers study the safety of these computations. One such compromise on the safety of cryptography is the side-channel attack. These attacks exploit sources of information called leakage that escape a cryptographic system in ways the original design did not intend. One dimension of a successful side-channel attack is the collection of leakage. This research configures the Advanced Encryption Standard (AES) on an FPGA and demonstrates strategies for collecting three types of side-channel leakage: power consumption, temperature emissions, and ring oscillations.

Go to article

Investigating Bismuth As A Surrogate For Plutonium Electrorefining, Greg Chipman Aug 2023

Investigating Bismuth As A Surrogate For Plutonium Electrorefining, Greg Chipman

Theses and Dissertations

Conducting research experiments on plutonium electrorefining is difficult due to the significant hazards and regulations associated with nuclear materials. Finding a surrogate for plutonium electrorefining studies would enable more fundamental research to be conducted. Potential surrogates were identified by determining the physical properties required to conduct electrorefining using a molten metal and molten salt in CaCl2 at 1123 K. More potential surrogates were identified by changing the matrix salt to be a LiCl-KCl-CaCl2 eutectic salt with electrorefining conducted at 673-773 K. Ce-CeCl3, In-InCl3, Zn-ZnCl2, Sn-SnCl2, and Bi-BiCl¬3 were investigated as potential plutonium electrorefining surrogates. Ce electrorefining in molten CaCl2 resulted …

Go to article

Comparison Of Compact Very High Frequency (Vhf) Antennas For Small Airborne Ground Penetrating Radar, Tayler Austen Livingston Jul 2023

Comparison Of Compact Very High Frequency (Vhf) Antennas For Small Airborne Ground Penetrating Radar, Tayler Austen Livingston

Theses and Dissertations

UHF bands because more penetration can be achieved at low frequencies. Consequently, large antennas are required, which limits their use for small airborne applications. This thesis explores various GPR antenna designs for a bi-static system that are at least operational from 225 MHz to 255 MHz and suitable for small airborne applications. The 3D electromagnetic simulation software Ansys high-frequency structure simulator (HFSS) was used to simulate various sizes of strip dipole, triangular bowtie, half elliptical bowtie, and elliptical bowtie antennas. Several physical models were constructed to validate the return loss simulation results. Additionally, simulation data is included for a wire …

Go to article

Liposomes For The Treatment Of Brain Cancer—A Review, Richu Raju, Waad H. Abuwatfa, William G. Pitt, Ghaleb A. Husseini Jul 2023

Liposomes For The Treatment Of Brain Cancer—A Review, Richu Raju, Waad H. Abuwatfa, William G. Pitt, Ghaleb A. Husseini

Faculty Publications

Due to their biocompatibility, non-toxicity, and surface-conjugation capabilities, liposomes are effective nanocarriers that can encapsulate chemotherapeutic drugs and facilitate targeted delivery across the blood–brain barrier (BBB). Additionally, strategies have been explored to synthesize liposomes that respond to internal and/or external stimuli to release their payload controllably. Although research into liposomes for brain cancer treatment is still in its infancy, these systems have great potential to fundamentally change the drug delivery landscape. This review paper attempts to consolidate relevant literature regarding the delivery to the brain using nanocarriers, particularly liposomes. The paper first briefly explains conventional treatment modalities for cancer, followed …

Go to article

A Review On Membrane Fouling Prediction Using Artificial Neural Networks (Anns), Waad H. Abuwatfa, Nour Al Sawaftah, Naif Darwish, William G. Pitt, Ghaleb A. Husseini Jul 2023

A Review On Membrane Fouling Prediction Using Artificial Neural Networks (Anns), Waad H. Abuwatfa, Nour Al Sawaftah, Naif Darwish, William G. Pitt, Ghaleb A. Husseini

Faculty Publications

Membrane fouling is a major hurdle to effective pressure-driven membrane processes, such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO). Fouling refers to the accumulation of particles, organic and inorganic matter, and microbial cells on the membrane’s external and internal surface, which reduces the permeate flux and increases the needed transmembrane pressure. Various factors affect membrane fouling, including feed water quality, membrane characteristics, operating conditions, and cleaning protocols. Several models have been developed to predict membrane fouling in pressure-driven processes. These models can be divided into traditional empirical, mechanistic, and artificial intelligence (AI)-based models. Artificial neural networks …

Go to article

Heat Transfer To Rolling Or Sliding Drops On Inclined Heated Superhydrophobic Surfaces, Joseph Merkley Furner Jul 2023

Heat Transfer To Rolling Or Sliding Drops On Inclined Heated Superhydrophobic Surfaces, Joseph Merkley Furner

Theses and Dissertations

This thesis examines the time resolved heat transfer to drops rolling or sliding along inclined, subcritical heated non-wetting surfaces. Results were experimentally obtained using IR imaging for a smooth hydrophobic surface and post as well as rib structured superhydrophobic surfaces of varying solid fraction (f_s = 0.06 - 0.5). Tests were performed at varying inclination angle (α = 10, 15, 20, and 25°), drop volume (12, 20, 30, and 40 μL), and surface temperature (T_w = 50, 65, and 80 °C). Rib structured superhydrophobic surfaces were explored for drops moving parallel and perpendicular to the rib structures. The findings indicate …

Go to article

Radar Processing Techniques For Using The Limesdr Mini As A Short-Range Lfm Radar, Jacob Scott Stratford Jul 2023

Radar Processing Techniques For Using The Limesdr Mini As A Short-Range Lfm Radar, Jacob Scott Stratford

Theses and Dissertations

Drone-mounted ground penetrating radar (GPR) has the capability to investigate terrain that is inaccessible or hazardous to humans. A linear frequency-modulated (LFM) radar with the potential for GPR applications is described based on the LimeSDR Mini software defined radio (SDR). Challenges of the LimeSDR Mini radar include the SDR's lack of support for transmitter-receiver synchronization and high bleedthrough leakage. These issues are overcome through corrective software processing techniques including deconvolution of the SDR's system impulse response and digital feed-through nulling. Feed-through nulling is effective at reducing bleedthrough leakage, achieving a 26 dB reduction in power. Although high noise can confound …

Go to article

Microfabrication Of Silicon Carbide And Metallized Polymers Using A Femtosecond Laser, Joseph Taylor Eddy Jul 2023

Microfabrication Of Silicon Carbide And Metallized Polymers Using A Femtosecond Laser, Joseph Taylor Eddy

Theses and Dissertations

Femtosecond lasers deliver a high peak concentration of optical power while maintaining low average power. With an accompanying optical setup, this power can be focused and used for high-precision fabrication of metallized polymers via ablation, creating conductive structures on a thin film. These lasers can also be harnessed in tandem with hydrofluoric acid and the two-photon absorption principle to selectively etch silicon carbide, a very durable and machining-resistant semiconductor with desirable properties. This thesis presents improvements made to the Laser-Assisted Chemical Etching (LACE) technique and the ablation system. ��, the two- photon absorption coefficient of silicon carbide, is measured and …

Go to article

Thermal Performance Of Thin-Shell Concrete Dome Structures, Daira Sofia Velasco Vega Jul 2023

Thermal Performance Of Thin-Shell Concrete Dome Structures, Daira Sofia Velasco Vega

Undergraduate Honors Theses

The objective of this research is to evaluate an insulated concrete thin-shell dome structure for thermal flux with various depths of soil coverings. Computational thermal analysis is performed to model temperature fluctuations inside a representative section of an experimental concrete dome structure during all four seasons of northern Utah. The results are compared against the baseline of a traditional insulated wood-framed building envelope and indicate that thermal flux is significantly reduced in the earth-sheltered concrete dome structure with foam on the outside of the concrete. The addition of soil dampens the amplitude of the flux and increases the time lag …

Go to article

Pectus Carinatum Patient Brace Data, Brandon Scott Sargent, Katie Varela, Dennis Eggett, Emily Mckenna, Christina Bates, Rebeccah Brown, Victor Garcia, Larry Howell Jul 2023

Pectus Carinatum Patient Brace Data, Brandon Scott Sargent, Katie Varela, Dennis Eggett, Emily Mckenna, Christina Bates, Rebeccah Brown, Victor Garcia, Larry Howell

ScholarsArchive Data

Data for the journal article "Modeling of the chest wall response to prolonged bracing in pectus carinatum" submitted to PLOS One in 2023 by Sargent et al. The data is a recording of prescribed brace pressures, patient reported hours of wear, and clinician recorded pressure to correct through the treatment process. The data file was compiled via Microsoft Excel as part of the Microsoft 365 Office Suite. The top row of each sheet within the file is the header line with the data in all subsequent rows. The journal article contains an in-depth definition of the variables used in the …

Go to article

A Multi-Scale Method For Combined Design And Dispatch Optimization Of Nuclear Hybrid Energy Systems Including Storage, Daniel Hill, Dawson Mccrea, An Ho, Matthew Memmott, Kody Powell, John Hedengren Jun 2023

A Multi-Scale Method For Combined Design And Dispatch Optimization Of Nuclear Hybrid Energy Systems Including Storage, Daniel Hill, Dawson Mccrea, An Ho, Matthew Memmott, Kody Powell, John Hedengren

Faculty Publications

Reliable, carbon-free power generation is increasing in importance. Nuclear-renewable hybrid energy systems (NHES) are a potential solution for current generation challenges, but design and dispatch optimization for these systems remains challenging particularly when stochastic effects, long time horizons and nonlinear modeling are needed. This work presents a multi-scale method for combining the design and dispatch optimization problems for nonlinear NHES over long time horizons. Rather than treating the entire horizon as a single optimization problem, a large number of combined optimization problems are solved for shorter samples of the horizon resulting in distributions of optimal capacities for each of the …

Go to article

Friction And Heat Transfer Modeling Of The Tool And Workpiece Interface In Friction Stir Welding Of Aa 6061-T6 For Improved Simulation Accuracy, Ryan Melander Jun 2023

Friction And Heat Transfer Modeling Of The Tool And Workpiece Interface In Friction Stir Welding Of Aa 6061-T6 For Improved Simulation Accuracy, Ryan Melander

Theses and Dissertations

Friction stir welding (FSW) is a solid-state joining process that offers advantages over traditional fusion welding. The amount of heat generated during a FSW process greatly influences the final properties of the weld. The heat is generated through two main mechanisms: friction and plastic deformation, with friction being the larger contributor in a FSW process. There is a need to develop better predictive models of the heat generation and heat transfer in FSW. Almost all models seen in the literature validate temperature predictions on only one side of the tool/workpiece interface, thus ignoring possible inaccuracy that comes from incorrect partitioning …

Go to article

Integration Of Insoluble And Soluble Dopants Into Steel Using Laser Powder Bed Fusion, Mckay Goodman Sperry Jun 2023

Integration Of Insoluble And Soluble Dopants Into Steel Using Laser Powder Bed Fusion, Mckay Goodman Sperry

Theses and Dissertations

Laser Powder Bed Fusion (LPBF) is an Additive Manufacturing (AM) method whereby complex parts can be built to near net geometry in an automated environment. Parts formed by LPBF have excellent properties and require little post-processing. While LPBF allows for creative designs to reduce weight and part count by integrating sub-components of assemblies, designers are limited to one material within any LPBF print. Although various materials can be used in LPBF, metals are of special interest to many industrial customers due to their high strength and toughness. The metals commonly used for LPBF include iron, aluminum, and titanium alloys. These …

Go to article

Detecting Lumbar Muscle Fatigue Using Nanocomposite Strain Gauges, Darci Ann Billmire Jun 2023

Detecting Lumbar Muscle Fatigue Using Nanocomposite Strain Gauges, Darci Ann Billmire

Theses and Dissertations

Introduction: Muscle fatigue can contribute to acute flare-ups of lower back pain with associated consequences such as pain, disability, lost work time, increased healthcare utilization, and increased opioid use and potential abuse. The SPINE Sense system is a wearable device with 16 high deflection nanocomposite strain gauge sensors on kinesiology tape which is adhered to the skin of the lower back. This device is used to correlate lumbar skin strains with the motion of the lumbar vertebrae and to phenotype lumbar spine motion. In this work it was hypothesized that the SPINE Sense device can be used to detect differences …

Go to article

On Algorithmic Design Methodologies, Heterogenous Rfsoc/Gpu Beamformers, And Cryogenic Antenna Efficiency Evaluation For Phased Array Receivers In Radio Astronomy, Mitchell C. Burnett Jun 2023

On Algorithmic Design Methodologies, Heterogenous Rfsoc/Gpu Beamformers, And Cryogenic Antenna Efficiency Evaluation For Phased Array Receivers In Radio Astronomy, Mitchell C. Burnett

Theses and Dissertations

Modern radio astronomy’s demand for high sensitivity and wide fields of view is met through innovations that reduce receiver system noise temperatures and integrate technology supporting parallel processing and larger instantaneous bandwidths. The advanced L-band phased array camera for astronomy (ALPACA) is a fully cryogenic 69 dual-polarized dipole PAF and digital beamformer back end for the Green Bank Telescope. This instrument will form 40 dual-polarized beams yielding a 0.35 sq. deg field of view on the sky with a 305.2 MHz processing bandwidth. The target system noise temperature is 27 K. A structured technique to map critically sampled and oversampled …

Go to article

Refill Friction Stir Fastener Repair In Aa7050-T7451, Andrew John Curtis Jun 2023

Refill Friction Stir Fastener Repair In Aa7050-T7451, Andrew John Curtis

Theses and Dissertations

The majority of Refill Friction Stir Spot Welding (RFSSW) is used to join two materials together oriented in a lap joint configuration. In this study, RFSSW was investigated and tested using an unconventional configuration setup, a hole/plug insertion approach. RFSSW was tested as a means of repairing a cracked rivet hole due to excessive use conditions. This was done by inserting a plug into a hole and using the RFSSW process to bond the plug to the base material. Machine and tool limits were investigated to determine if a refilled plug repair was possible and if complete mixing between plug/hole …

Go to article

Cesium Voltilization In Lif-Bef2: Predicting Release In The Event Of Fhr Fuel Failure, Johnny Hedrick Williams Jun 2023

Cesium Voltilization In Lif-Bef2: Predicting Release In The Event Of Fhr Fuel Failure, Johnny Hedrick Williams

Theses and Dissertations

This work demonstrates how ICP-MS can be employed to evaluate cesium volatilization from LiF-BeF2 (Flibe) salt with ab initio molecular dynamics studies used as corroborating data to better understand cesium behavior. Using mixtures of Flibe with 2 mol% CsF, it was found that cesium was stable within the salt melt at temperatures between 500-650°C over a time span of 8 hours. At 800°C, cesium vaporized from the salt at a rate of 0.83% / hr with a mass flux of 0.0023 g Cs / cm2hr. The atomistic modeling results show poor solvation of Cs at 500°C and 800°C, with stability …

Go to article

First Prev Next Last