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Articles 1 - 30 of 1544

Full-Text Articles in Nuclear Engineering

Simple Flexible Molten Salt Reactor, Luke Seifert, Alex Boettinger, Jackson Breakell, Patrick Wooden May 2020

Simple Flexible Molten Salt Reactor, Luke Seifert, Alex Boettinger, Jackson Breakell, Patrick Wooden

Chancellor’s Honors Program Projects

No abstract provided.


Space And Defense – Volume Eleven – Number One – Spring 2019, Space And Defense Journal Mar 2020

Space And Defense – Volume Eleven – Number One – Spring 2019, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Nine – Number One – Spring 2016, Space And Defense Journal Mar 2020

Space And Defense – Volume Nine – Number One – Spring 2016, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Eight – Number One – Spring 2015, Space And Defense Journal Mar 2020

Space And Defense – Volume Eight – Number One – Spring 2015, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Seven – Number One – Winter 2014, Space And Defense Journal Mar 2020

Space And Defense – Volume Seven – Number One – Winter 2014, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Six – Number One – Fall 2012, Space And Defense Journal Mar 2020

Space And Defense – Volume Six – Number One – Fall 2012, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Five – Number One – Summer 2011, Space And Defense Journal Mar 2020

Space And Defense – Volume Five – Number One – Summer 2011, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Four – Number Two – Summer 2010, Space And Defense Journal Mar 2020

Space And Defense – Volume Four – Number Two – Summer 2010, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Four – Number One – Winter 2010, Space And Defense Journal Mar 2020

Space And Defense – Volume Four – Number One – Winter 2010, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Three – Number Two – Fall 2009, Space And Defense Journal Mar 2020

Space And Defense – Volume Three – Number Two – Fall 2009, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Three – Number One – Summer 2009, Space And Defense Journal Mar 2020

Space And Defense – Volume Three – Number One – Summer 2009, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Two – Number Three – Winter 2009, Space And Defense Journal Mar 2020

Space And Defense – Volume Two – Number Three – Winter 2009, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Two – Number Two – Winter 2008, Space And Defense Journal Mar 2020

Space And Defense – Volume Two – Number Two – Winter 2008, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Two – Number One – Winter 2008, Space And Defense Journal Mar 2020

Space And Defense – Volume Two – Number One – Winter 2008, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume One – Number One – Fall 2006, Space And Defense Journal Mar 2020

Space And Defense – Volume One – Number One – Fall 2006, Space And Defense Journal

Space and Defense

No abstract provided.


Determination And Simulation Of The Neutron Spectrum Of Nuclear Detonations And Surrogate Sources, Taylor M. Nichols Mar 2020

Determination And Simulation Of The Neutron Spectrum Of Nuclear Detonations And Surrogate Sources, Taylor M. Nichols

Theses and Dissertations

This research determined a methodology for characterizing the Fast Beam Facility (FBF) at The Ohio State University Nuclear Reactor Laboratory to test the response of photovoltaic arrays to nuclear weapon radiation. Additionally, this research developed neutron and gamma nuclear weapon output spectra of two environments for comparison to the FBF spectrum. A Bonner sphere spectrometer (BSS), coupled with the unfolding program Maximum Entropy Deconvolution (MAXED), was employed as a means of determining the energy spectrum of neutrons. Using the ISO 8529 americium beryllium (AmBe) source as the a priori default spectrum, MAXED was used to unfold the spectrum of neutrons ...


Determination Of Lithium Isotope Concentration By Laser Induced Breakdown Spectroscopy Using Chemometrics, Jason C. Wood Mar 2020

Determination Of Lithium Isotope Concentration By Laser Induced Breakdown Spectroscopy Using Chemometrics, Jason C. Wood

Theses and Dissertations

The role of enriched 6Li in nuclear applications makes the ability to detect and monitor lithium enrichment activity imperative. Detecting levels of enrichment of this isotope currently requires sensitive, complex equipment operated by highly-trained technicians, which is prohibitive to rapid detection of enrichment activity. While commercial companies market portable laser induced breakdown spectroscopy (LIBS) with the ability to detect elements on the order or parts per million concentrations, they have not yet been demonstrated to possess the ability to quantitatively determine isotopic concentrations of lithium. This research performs single-pulse LIBS experiments under laboratory conditions to determine concentrations of 7Li and ...


Analysis Of The Correlation Between Re Filament Surface Features And Tims Performance, Christopher J. Mihal Mar 2020

Analysis Of The Correlation Between Re Filament Surface Features And Tims Performance, Christopher J. Mihal

Theses and Dissertations

Thermal Ionization Mass Spectrometry (TIMS) is an invaluable tool in nuclear forensics as it enables isotopic assays of actinides to be measured, permitting analysis to include special nuclear material isotopic assays, nuclear reactor monitoring, and treaty verification. In one method of measurement for the TIMS system, samples are deposited in solution form on high-purity rhenium filaments. The filaments are heated to evaporate the solvent, and then further heated to cause sample ionization, permitting the sample to be transmitted through a magnetic field which separates ions based on mass to charge ratio into detectors for counting. Heavier ions will be deflected ...


The Effect Of Aeration Rate And Free-Floating Carrier Media On The Emission Of Bacillus Globigii In Bioaerosols, Andrew J. Owens Mar 2020

The Effect Of Aeration Rate And Free-Floating Carrier Media On The Emission Of Bacillus Globigii In Bioaerosols, Andrew J. Owens

Theses and Dissertations

Aerosols produced by turbulent mechanical mixing and bubble aeration at Waste Water Treatment Plants (WWTPs) become bioaerosols with the entrainment of biological materials. Bioaerosols become a public health risk when human pathogens are present. This study evaluated bioaerosols containing Bacillus globigii (BG) spores, and the effects that aeration rate and the addition of Free-Floating Carrier Media (FFCM) had on the amount of BG spores collected following aerosolization. A series of laboratory-scale experiments investigated two different sizes of floating polystyrene spheres as FFCM and four different aeration rates. When the differences in compared aeration rates were sufficiently large, a positive correlation ...


Dose Deposition And Electrostatic Charging Of Kapton Films Irradiated With Electrons, Youssef Abouhussien, Gennady Miloshevsky Jan 2020

Dose Deposition And Electrostatic Charging Of Kapton Films Irradiated With Electrons, Youssef Abouhussien, Gennady Miloshevsky

Graduate Research Posters

Kapton films are widely utilized in harsh radiation environments where radiation resistant insulating materials are required. For space applications, Kapton polymers are used on satellites as substrates for solar arrays and outer layers of thermal systems. Kapton is also used in nuclear power plants as wire insulation. Kapton materials can be exposed in nuclear reactors to a reactive chemical environment in addition to severe radiation. It is of utmost important to understand how Kapton materials behave under high irradiation conditions and mitigate radiation damage effects. High-energy electrons can deposit ionizing dose and electric charge deeply inside Kapton materials. The charge ...


Jxb Force Effects On Beryllium Melt Splashing In Fusion Devices, Cheng Zhang, Gennady Miloshevsky Jan 2020

Jxb Force Effects On Beryllium Melt Splashing In Fusion Devices, Cheng Zhang, Gennady Miloshevsky

Graduate Research Posters

Instability and disruption of high-temperature plasma in fusion devices may result in the edge-localized modes (ELMs) and lead to melting of plasma facing components (PFCs) causing their damage. Beryllium (Be) is used as a first wall for PFCs due to its low density, high strength, and high thermal conductivity. However, melting of Be on the surface of first wall is of a great concern as splashing of a molten Be layer will result in the plasma contamination and termination of fusion reaction. Therefore, it is important to understand the physics mechanisms characterizing the splashing of Be from a pool under ...


Spatio-Temporal Evolution Of Warm Dense Plasmas: Molecular Dynamics Modeling, Harrison Wenzel, Gennady Miloshevsky Jan 2020

Spatio-Temporal Evolution Of Warm Dense Plasmas: Molecular Dynamics Modeling, Harrison Wenzel, Gennady Miloshevsky

Graduate Research Posters

SPATIO-TEMPORAL EVOLUTION OF WARM DENSE PLASMAS: MOLECULAR

DYNAMICS MODELING Cole Wenzel and Gennady Miloshevsky

Virginia Commonwealth University, Department of Mechanical and Nuclear Engineering, 401

West Main St, Richmond, VA 23284-3015

The exo-atmospheric detonation of nuclear device would be of great impact on the material integrity of orbiting satellites. The spectral energy distribution of high intensity X-ray flux, ~10 28 -10 35 photons/(cm 2 ∙s), originating from a nuclear blast is described by the Planck's blackbody function with the temperature from 0.1 keV to 10 keV. Particular damage would occur to the multi-layered, solar cell panels of satellites ...


Perfusion Cell Seeding And Expansion In Dual Mechanical Stimulation Bioreactor For In Vitro Tissue Development, Sarah Saunders, Sam Coles, Joao S. Soares Jan 2020

Perfusion Cell Seeding And Expansion In Dual Mechanical Stimulation Bioreactor For In Vitro Tissue Development, Sarah Saunders, Sam Coles, Joao S. Soares

Graduate Research Posters

BACKGROUND: Engineered tissues are an exciting potential source of small diameter vascular grafts due to limited supply and patency of available alternatives. Engineered tissue vascular grafts (ETVGs) will provide physiological function that resembles native arteries and maintain the required mechanical properties as they integrate with host tissue. Mechanical stimulation during incubation encourages proper cell alignment and increases extracellular matrix deposition. The enhanced organization of the engineered tissue leads to improved compliance over synthetic alternatives without sacrificing strength and may lead to better integration in vivo.

METHODS: We have developed a bioreactor that mechanically trains grafts during incubation. To test the ...


Elastic Foundations As Heterogeneous Adventitial Boundary Condition For The Assessment Of Aortic Wall And Peri-Aortic Stiffness From Dense-Mri Data Using Inverse Fem Approach, Johane H. Bracamonte, John S. Wilson, Joao S. Soares Jan 2020

Elastic Foundations As Heterogeneous Adventitial Boundary Condition For The Assessment Of Aortic Wall And Peri-Aortic Stiffness From Dense-Mri Data Using Inverse Fem Approach, Johane H. Bracamonte, John S. Wilson, Joao S. Soares

Graduate Research Posters

Background: The establishment of in vivo, patient-specific, and regionally resolved techniques to quantify aortic properties is key for improving risk assessment in clinical practice and scientific understanding of cardiovascular growth and remodeling. Many in vivo studies quantify vascular stiffness using Pulse Wave Velocity. This method provides an averaged measure of stiffness for the entire aorta, ignoring variations in wall stiffness and boundary conditions. Previous studies using Displacement Encoding with Stimulated Echoes Magnetic Resonance Imaging (DENSE-MRI) suggested that the infrarenal abdominal aorta (IAA) deforms heterogeneously throughout the cardiac cycle.

Method: Herein, we hypothesize that the aortic wall strain heterogeneity is driven ...


Development Of Near-Real Time Material Detection And Analysis By Coupling Electrochemical & Optical Spectroscopy Methods For Molten Salt Systems, Hunter Andrews Jan 2020

Development Of Near-Real Time Material Detection And Analysis By Coupling Electrochemical & Optical Spectroscopy Methods For Molten Salt Systems, Hunter Andrews

Theses and Dissertations

For both pyroprocessing and molten salt reactors (MSRs), it is desirable from a process control and nuclear safeguards perspective to monitor the species in the molten salts for material accountancy. Many traditional monitoring techniques, even simple salt sample retrieval, are time exhaustive or rendered useless for these systems due to the high thermal loads, high radiation zones, and corrosive nature of molten salts. Therefore, the main motivation for this work is the need for an online monitoring system for a molten salt system that is robust enough to handle the extreme environment yet deliver quantifiable salt concentrations. The intent of ...


A Case Study: The First Coastal Nuclear Decommissioning Project In California, Willie Aaron Quiros Dec 2019

A Case Study: The First Coastal Nuclear Decommissioning Project In California, Willie Aaron Quiros

Construction Management

San Onofre Nuclear Generating System (SONGS) is one of two nuclear power plants in California. Since the shut down in 2012, there is only one actively remaining, Diablo Canyon Nuclear Power Plant, which is set to shut down in 2024. This paper will examine the decommissioning of SONGS thus far; the first coastal nuclear decommissioning project in California’s stringent permitting process. This project was awarded as a joint venture to AECOM and Energy Solutions, both having experiencing in the field of nuclear decommissioning. This paper will outline what nuclear decommissioning challenges have been in the past; general steps of ...


Thermal Properties Of A Lif-Thf4 Molten Salt Fuel, Jackson Hill Nov 2019

Thermal Properties Of A Lif-Thf4 Molten Salt Fuel, Jackson Hill

Georgia Undergraduate Research Conference (GURC)

Molten salt reactors have seen an insurgence of interest and studies because of their high efficiency and their relatively compact design when compared to traditional reactors such as boiling water reactors. This study delves into the thermal properties of a LiF-ThF4 fuel for use in an MSR (Molten Salt Reactor).


Thermal Transport In Molten Salt Reactor Fuels, Bryce Atchley Nov 2019

Thermal Transport In Molten Salt Reactor Fuels, Bryce Atchley

Georgia Undergraduate Research Conference (GURC)

Thermal Transport in Molten Salt Reactor Fuels

Bryce Atchley, Jackson Hill, Jungkyu Park, Eduardo Farfan

In this research study, we explore the thermal transport property of Molten Salt Reactor (MSR) fuels by using molecular dynamics simulations. MSR has been drawing attention from researchers recently since it can run at high temperatures, yielding high energy production efficiency at relatively low amount of fuel mass. Its low operating pressure reduces the risk of a large break and loss of coolant significantly. Among different possible MSR fuels, LiF-ThF4 is selected to examine the thermal transport property of MSR fuels. Reverse Non-equilibrium molecular dynamics ...


Effect Of Ion Implantation On The Mechanical Properties Of The Grain And Grain Boundary Regions Of Inconel X750, Maisaa Nezar Tawfeeq Oct 2019

Effect Of Ion Implantation On The Mechanical Properties Of The Grain And Grain Boundary Regions Of Inconel X750, Maisaa Nezar Tawfeeq

Electronic Thesis and Dissertation Repository

Annulus gas spacers in CANada Deuterium Uranium (CANDU) nuclear reactors are made from the heat-treated Inconel X750 Nickel-based alloy. This alloy is designed to have high strength and creep resistance at elevated temperature. Unlike other reactor designs, the CANDU reactor has a high thermal neutron fluence, which results in an enhancement of the radiation damage and the internal production of helium and hydrogen. They are thus susceptible to microstructural instability and mechanical property degradation with time. Studies of ex-service spacers have indicated that they display intergranular embrittlement and lower ultimate tensile strength compared to nonirradiated Inconel X750. The primary degradation ...


Bison Simulation-Based Identification Of Important Design Criteria For U3si2 Fuels With Composite-Monolithic Duplex Sic Cladding, Jacob A. Yingling Oct 2019

Bison Simulation-Based Identification Of Important Design Criteria For U3si2 Fuels With Composite-Monolithic Duplex Sic Cladding, Jacob A. Yingling

Theses and Dissertations

Accident Tolerant Fuels (ATF) require a combination of fuel and cladding which have comparable longevity characteristics to UO2 while improving resistance to radiological release during and after accidents. U3Si2 has been proposed for use in ATF concepts for its high uranium density and high thermal conductivity which provide improved fuel performance. However, some of U3Si2’s material properties are not well understood. One such property, thermal creep of U3Si2, is an important contributing factor to U3Si2’s viability as an ATF. No experimentally derived thermal creep model is published for U3Si2, and previous analyses of compressive thermal creep experimental data ...