Richard E. Jacob
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View article: Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator
Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator Open
Understanding dense matter hydrodynamics is critical for predicting plasma behavior in environments relevant to laser-driven inertial confinement fusion. Traditional diagnostic sources face limitations in brightness, spatiotemporal resolut…
View article: Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator
Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator Open
Understanding dense matter hydrodynamics is critical for predicting plasma behavior in environments relevant to laser-driven inertial confinement fusion. Traditional diagnostic sources face limitations in brightness, spatiotemporal resolut…
View article: Mapping Neural Signals to Agent Performance, A Step Towards Reinforcement Learning from Neural Feedback
Mapping Neural Signals to Agent Performance, A Step Towards Reinforcement Learning from Neural Feedback Open
Implicit Human-in-the-Loop Reinforcement Learning (HITL-RL) is a methodology that integrates passive human feedback into autonomous agent training while minimizing human workload. However, existing methods often rely on active instruction,…
View article: Enhanced Isomer Population via Direct Irradiation of Solid-Density Targets Using a Compact Laser-Plasma Accelerator
Enhanced Isomer Population via Direct Irradiation of Solid-Density Targets Using a Compact Laser-Plasma Accelerator Open
Excitation of long-lived states in bromine nuclei using a tabletop laser-plasma accelerator providing pulsed (<100 fs) electron beams provided a sensitive probe of γ strength and level densities in the nuclear quasicontinuum and may indica…
View article: Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator
Multi-messenger dynamic imaging of laser-driven shocks in water using a plasma wakefield accelerator Open
Understanding dense fuel hydrodynamics is critical for predicting burning plasma behavior in laser-driven inertial confinement fusion. Traditional diagnostic sources face many limitations in brightness, spatio-temporal resolution, and thei…
View article: Results of Post-Process NDE Using Advanced Techniques on AM Parts
Results of Post-Process NDE Using Advanced Techniques on AM Parts Open
The purpose of this report is to provide an overview of the FY24 activities to apply advanced nondestructive examination (NDE) methods to materials and components produced using advanced manufacturing (AM) processes such as Laser Powder Be…
View article: Method of assessing heterogeneity in images
Method of assessing heterogeneity in images Open
A method of assessing heterogeneity in images is disclosed. 3D images of an object are acquired. The acquired images may be filtered and masked. Iterative decomposition is performed on the masked images to obtain image subdivisions that ar…
View article: Modeling and Simulation of Austenitic Welds and Coarse-grained Specimens: Part II
Modeling and Simulation of Austenitic Welds and Coarse-grained Specimens: Part II Open
The Pacific Northwest National Laboratory (PNNL) is conducting confirmatory research for the U.S. Nuclear Regulatory Commission (NRC) to evaluate commercially available nondestructive examination (NDE) modeling and simulation software used…
View article: Development of a rhesus monkey lung geometry model and application to particle deposition in comparison to humans
Development of a rhesus monkey lung geometry model and application to particle deposition in comparison to humans Open
The exposure-dose-response characterization of an inhalation hazard established in an animal species needs to be translated to an equivalent characterization in humans relative to comparable doses or exposure scenarios. Here, the first geo…
View article: Superconducting films of MgB <sub>2</sub> via ion beam mixing of Mg/B multilayers
Superconducting films of MgB <sub>2</sub> via ion beam mixing of Mg/B multilayers Open
The growth of smooth superconducting MgB 2 films in a non-epitaxial regime is challenging. Here, we study the formation of superconducting MgB 2 films by solid-phase reactive inter-diffusion of sputter-deposited Mg/B multilayers, employing…
View article: NDE Reliability Issues for the Examination of CASS Components
NDE Reliability Issues for the Examination of CASS Components Open
The relatively low cost and corrosion resistance of cast austenitic stainless steel (CASS) materials resulted in their extensive use for piping systems in nuclear power plants (NPPs). However, CASS component welds are among the most challe…
View article: Status of Mock-up and Integration for Ultrasonic Deformation Sensor for TREAT Experiments
Status of Mock-up and Integration for Ultrasonic Deformation Sensor for TREAT Experiments Open
Fuel deformation (both axial and radial) information provides insights into fuel performance and failure limits. Traditionally, fuel deformation has been quantified using post-irradiation examinations due to the lack of an appropriate sens…
View article: Solid-phase reactive inter-diffusion of Mg/B multilayers
Solid-phase reactive inter-diffusion of Mg/B multilayers Open
A better understanding of the reaction of Mg and B in the solid-phase regime is needed for the low-temperature synthesis of MgB2 films. Here, we study the kinetics of reactive inter-diffusion of Mg and B multilayers on glassy carbon substr…
View article: Design Requirements for Ultrasonic Deformation Sensor for TREAT Experiments
Design Requirements for Ultrasonic Deformation Sensor for TREAT Experiments Open
Ultrasonic measurements of deformation can provide nondestructive measurements of dimensional changes rapidly (within tens to hundreds of microseconds). Further these methods are sensitive to both microstructural changes due to damage (fro…
View article: Anatomical Details of the Rabbit Nasal Passages and Their Implications in Breathing, Air Conditioning, and Olfaction
Anatomical Details of the Rabbit Nasal Passages and Their Implications in Breathing, Air Conditioning, and Olfaction Open
The rabbit is commonly used as a laboratory animal for inhalation toxicology tests and detail knowledge of the rabbit airway morphometry is needed for outcome analysis or theoretical modeling. The objective of this study is to quantify the…
View article: Comparison of realistic and idealized breathing patterns in computational models of airflow and vapor dosimetry in the rodent upper respiratory tract
Comparison of realistic and idealized breathing patterns in computational models of airflow and vapor dosimetry in the rodent upper respiratory tract Open
The differences in tissue AUCs at known lesion-forming regions for acetaldehyde between normal and idealized profiles were minimal, suggesting that sinusoidal profiles may be used for this chemical and exposure concentration. However, depe…
View article: Development of a Zealand white rabbit deposition model to study inhalation anthrax
Development of a Zealand white rabbit deposition model to study inhalation anthrax Open
Despite using rabbits in several inhalation exposure experiments to study diseases such as anthrax, there is a lack of understanding regarding deposition characteristics and fate of inhaled particles (bio-aerosols and viruses) in the respi…