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Dominion University College

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28 researchers0 verified17 linked papers91 indexed citations

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Research from this institution

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1999 · Physical Review C · 17 citations

Out-of-plane measurements of the fifth response function of the exclusive electronuclear response

The first measurements of ${f}_{\mathrm{LT}}^{\ensuremath{'}},$ known as the fifth response function, have been made for the ${}^{2}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}p)$ and ${}^{12}\mathrm{C}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}p)$ reactions. This response is directly related to the imaginary part of the interference between the transverse and longitudinal nuclear electromagnetic currents. Its observation requires longitudinally polarized electron beams and out-of-plane detection, the latter made possible by the newly developed out-of-plane spectrometer system. The initial measurements were made by using a 560-MeV polarized electron beam and quasielastic kinematics at ${Q}^{2}=3.3 {\mathrm{fm}}^{\ensuremath{-}2}.$ The development of the methodology for out-of-plane physics, and the analysis of the data from the initial experiments are described in detail. The measured fifth response and the related asymmetry in the coincidence cross section are in agreement, albeit with large statistical errors, with the theoretical predictions. Future extensions of the out-of-plane program are also discussed.

2011 · 13 citations

Helicopter Downwash/Frigate Airwake Interaction Flowfield PIV Surveys in a Low Speed Wind Tunnel

The work presented was performed at Old Dominion University and is part of a larger research program aimed at identifying interactions between rotor downwash and ship airwakes. The ODU Low-Speed Wind Tunnel was used with a simplified 1/50 scale frigate waterline model and traverse mounted powered rotor. Particle Image Velocimetry (PIV) velocity surveys were compared with rotor thrust coefficient measurements at locations of identified interaction to help understand the underlying flow physics. Initially, PIV surveys of the frigate model landing deck in isolation and the rotor in isolation were performed to provide a baseline flow understanding. A PIV flowfield survey was conducted with the ship in isolation, rotor in isolation and then the combined ship/rotor cases in order to compare superposed individual velocity fields to a combined measurement. Tests were performed with and without the presence of a rotary wing downwash influence on the landing deck centerline (y=0) for a wind-over-deck angle (WOD) of zero.

2025 · The European Physical Journal C · 11 citations

VAIM-CFF: a variational autoencoder inverse mapper solution to Compton form factor extraction from deeply virtual exclusive reactions

Abstract We develop a new methodology for extracting Compton form factors (CFFs) from deeply virtual exclusive reactions such as the unpolarized DVCS cross section using a specialized inverse problem solver, a variational autoencoder inverse mapper (VAIM). The VAIM-CFF framework not only allows us access to a fitted solution set possibly containing multiple solutions in the extraction of all 8 CFFs from a single cross section measurement, but also accesses the lost information contained in the forward mapping from CFFs to cross section. We investigate various assumptions and their effects on the predicted CFFs such as cross section organization, number of extracted CFFs, use of uncertainty quantification technique, and inclusion of prior physics information. We then use dimensionality reduction techniques such as principal component analysis to visualize the missing physics information tracked in the latent space of the VAIM framework. Through re-framing the extraction of CFFs as an inverse problem, we gain access to fundamental properties of the problem not comprehensible in standard fitting methodologies: exploring the limits of the information encoded in deeply virtual exclusive experiments.

2012 · InTech eBooks · 10 citations

Unitary Qubit Lattice Gas Representation of 2D and 3D Quantum Turbulence

Turbulence is of vital interest and importance to the study of fluid dynamics Pope (1990). In classical physics, turbulence was first studied carefully for incompressible flows whose evolution was given by the Navier-Stokes equations. One of the most celebrated results of incompressible classical turbulence (CT) is the existence of an inertial range with the cascade of kinetic energy from large to small spatial scales until one reaches scale lengths on the order of the dissipationwave length and the eddies/vortices are destroyed. The Kolmogorov kinetic energy spectrum in this inertial range follows the power law in wave number space.

2025 · Physical Review A · 9 citations

Hybrid quantum simulations with qubits and qumodes on trapped-ion platforms

We explore the feasibility of gate-based hybrid quantum computing using both discrete (qubit) and continuous (qumode) variables on trapped-ion platforms. Trapped-ion systems have demonstrated record one- and two-qubit gate fidelities and long qubit coherence times, while qumodes, which can be represented by the collective vibrational modes of the ion chain, have remained relatively unexplored for their use in computing. Using numerical simulations, we show that high-fidelity hybrid gates and measurement operations can be achieved for existing trapped-ion quantum platforms. As an exemplary application, we consider quantum simulations of the Jaynes-Cummings-Hubbard model, which is given by a one-dimensional chain of interacting spin and boson degrees of freedom. Using classical simulations, we study its real-time evolution and develop a suitable variational quantum algorithm for ground state preparation. Our results motivate further studies of hybrid quantum computing in this context, which may lead to direct applications in condensed matter and fundamental particle and nuclear physics.

2015 · 53rd AIAA Aerospace Sciences Meeting · 9 citations

Flame Extinction Dynamics of Lean Premixed Bluff-Body Stabilized Flames

There is a crucial need to improve energy conversion efficiencies and minimize the environmental impact of turbulent combustion systems for energy production. Lean premixed turbulent combustion operation will significantly reduce efficiency-based thermal losses and combustion emissions. However, the performance of lean turbulent combustion technology is inevitably limited by the effects of flame extinction. Flames operating at lean conditions are susceptible to stabilization dynamics caused by local reaction extinction; this leads to global flame blowout and termination of the combustion energy production process. An improved understanding and prediction of flame extinction and stability will guide strategies to enhance efficiency, reduce emissions and improve performance of turbulent combustion systems. This research is focused on understanding the physical mechanisms of flame extinction using a newly-developed physics-based model. The novelty of this model is that it interactively couples the physics of the turbulent flow through a dynamic Lagrangian vortex method and the strained flame reaction kinetics using a one-dimensional opposed-jet flame. This innovative modeling strategy effectively captures the dynamic flame stability and extinction for turbulent premixed combustion.

2016 · American Journal of Engineering Education (AJEE) · 6 citations

Communicating Wave Energy: An Active Learning Experience For Students

We have conducted an education project to communicate the wave energy concept to high school students. A virtual reality system that combines both hardware and software is developed in this project to simulate the buoy-wave interaction. This first-of-its-kind wave energy unit is portable and physics-based, allowing students to conduct a number of hands-on activities. This system is the core component of an educational experience that integrates demonstration and hands-on learning, with an aim of introducing the wave energy conversion process to students in an interactive environment. Presentations have been made at two different high schools with diverse student populations, and students involved in this project rated very positively about their learning experience. As revealed by their feedback, the virtual environment and its combination with the hardware are the most important factors that help students to appreciate the knowledge in the wave energy conversion process.

2025 · Physical review. D/Physical review. D. · 5 citations

State preparation of lattice field theories using quantum optimal control

We explore the application of quantum optimal control (QOC) techniques to state preparation of lattice field theories on quantum computers. As a first example, we focus on the Schwinger model, quantum electrodynamics in $1+1$ dimensions. We demonstrate that QOC can significantly speed up the ground state preparation compared to gate-based methods, even for models with long-range interactions. Using classical simulations, we explore the dependence on the interqubit coupling strength and the device connectivity, and we study the optimization in the presence of noise. While our simulations indicate potential speedups, the results strongly depend on the device specifications. In addition, we perform exploratory studies on the preparation of thermal states. Our results motivate further studies of QOC techniques in the context of quantum simulations for fundamental physics.

2009 · Contemporary Physics · 5 citations

Freezing light with cold atoms

The impact of disorder and localisation in electronic conduction was introduced more than half a century ago by Philip Anderson. In a much broader context of disorder-mediated wave dynamics it remains an important research area, and surprises abound. Meanwhile, research in ultracold atomic physics has led to phenomenally detailed elucidation of properties, including changes in phase, of quantum degenerate Bosonic and Fermionic gases. For example, beautiful experiments have recently demonstrated, in quasi one-dimensional systems, Anderson localisation of matter waves. In this brief essay, we describe and discuss research on wave localisation in the context of ultracold atomic physics, with a particular emphasis on light localisation in ultracold and high-density atomic gases. Essential ideas are reviewed, along with the current experimental status of the field, and promising avenues for future research are discussed.

2018 · 3 citations

Overview of Game and Content Design for a Mobile Game that will Prepare Students in Calculus and Physics Prerequisites to the Engineering Curriculum

As part of a research project which assists veterans as they exit the military, complete engineering degrees, and enter the workforce as engineering professionals, a range of serious games for Science, Technology, Engineering, and Mathematics (STEM) education is under development. The current focus of this development is CAPTIVATE, a serious game to assist student veterans in mastering the calculus and physics skills that are necessary prerequisites to the main engineering curriculum. Building on the development and lessons learned from MAVEN, a game developed previously to help student veterans master precalculus skills, the design and initial implementation for CAPTIVATE involves careful consideration regarding game and instructional design. Many of the positive aspects from the design of MAVEN will be implemented in CAPTIVATE. First, the overall framework developed for MAVEN will be reused in CAPTIVATE. This modular framework involves both a model and process that combine game, instructional, and software design in a way that supports adaptability throughout the design and development cycle. Additionally by embedding concepts in game play similar to well-known board games such as Battleship, computer games such as Minesweeper, and console or mobile games such as Guitar Hero, students will use their calculus and physics skills to complete tasks in a familiar environment. In addition, the game itself will consist of a series of sub-games each focusing on a topic that students traditionally struggle to understand. Furthermore, students will be offered access to learning resources and assessed regularly as they progress through the game. CAPTIVATE will also overcome some shortcomings from the previous development. While MAVEN was developed for desktop deployment, CAPTIVATE is targeted for deployment on a variety of mobile device including Apple and Android phones and tablets to engage students in interactive games that support their endeavor to build a solid foundation in mathematics and science topics. Additionally by creating games that are short and easily accessible, students will be able to engage with the material at a time and place convenient for them. The development of CAPTIVATE supports student veterans as they transition from the military to engineering degree programs and helps to accelerate them through their STEM prerequisite courses.

2026 · Physical review. D/Physical review. D. · 1 citations

Proton transparency and neutrino physics: New methods and modeling

Extracting accurate results from neutrino oscillation and cross section experiments requires accurate simulation of the neutrino-nucleus interaction. The rescattering of outgoing hadrons (final state interactions) by the rest of the nucleus is an important component of these interactions. We present a new measurement of proton transparency (defined as the fraction of outgoing protons that emerge without significant rescattering) using electron-nucleus scattering data recorded by the CLAS detector at Jefferson Laboratory on helium, carbon, and iron targets. This analysis uses a new data-driven method to extract the transparency. It defines transparency as the ratio of electron-scattering events with a detected proton to quasi-elastic electron-scattering events where a proton should have been knocked out. Our results are consistent with previous measurements that determined the transparency from the ratio of measured events to theoretically predicted events. We find that the GENIE event generator, which is widely used by oscillation experiments to simulate neutrino-nucleus interactions, needs to better describe both the nuclear ground state and proton rescattering in order to reproduce our measured transparency ratios, especially at lower proton momenta.

2025 · Radiation effects and defects in solids · 0 citations

Quantum lattice representation of nonlinear classical physics

Using the Madelung transformation on a generalized scalar Gross–Pitaevski equation, a nonlinear continuum fluid equations are derived for a classical fluid. A unitary quantum lattice algorithm is then determined as a second order discrete representation of this Gross–Pitaevski equation and the simulations are compared to those using classical fluid dynamic techniques.

2025 · Physical Review Physics Education Research · 0 citations

Exploring physics teacher identity: Pathways toward equitable instruction among teachers

Physics teacher identity encompasses teachers’ beliefs and views toward being a physics teacher. Physics teacher identity is influenced by teachers’ perspectives on physics teaching and learning. Previous studies on teacher identity in general suggest that the construct is complex and malleable. Studies further suggest that it influences instructional methods, student engagement, and classroom environment. However, within physics education, there has yet to be an examination of how physics teacher identity influences “equitable” teaching approaches. This qualitative study sought to identify various dimensions of physics teacher identity and its implications for physics education research. We interviewed secondary and postsecondary physics teachers ( n = 1 0 ) from different regions of the country with varying years of experience. We searched for consistent themes regarding the influence of physics teacher identity on equitable instruction using a conceptual framework that examines conceptions of self, others, knowledge, and pedagogy. Findings showed that teachers held a variety of conceptions of self and others, while many struggled to describe their conceptions of knowledge and pedagogy. Our findings are significant for physics teachers, educators, and researchers aiming to employ equitable teaching strategies. Ultimately, this study fostered a deeper understanding of the relationship between physics teacher identity and equitable instruction.

2021 · ODU Digital Commons (Old Dominion University) · 0 citations

End-to-End Physics Event Generator

We apply generative adversarial network (GAN) technology to build an event generator that simulates particle production in electron-proton scattering that is free of theoretical assumptions about underlying particle dynamics. The difficulty of efficiently training a GAN event simulator lies in learning the complicated pat- terns of the distributions of the particles physical properties. We develop a GAN that selects a set of transformed features from particle momenta that can be generated easily by the generator, and uses these to produce a set of augmented features that improve the sensitivity of the discriminator. The new Feature-Augmented and Transformed GAN (FAT-GAN) is able to faithfully reproduce the distribution of final state electron momenta in inclusive electron scattering, without the need for input derived from domain-based theoretical assumptions. The developed technology can play a significant role in boosting the science of the Jefferson Lab 12 GeV program and the future Electron-Ion Collider.

2002 · 0 citations

Ancient Integrals and Modern Numerics - Where's the Physics?

It is proposed that engineering educators should carefully consider the use of modern numerical solution techniques as outright replacements for traditional analytical solutions in many applications. Examples are given from the field of aerodynamics, specifically thin airfoil and finite wing theory. It is shown that an arguably more useful solution can be obtained more easily, and with a more direct connection to the underlying physics of the problem, using numerical approaches.

1992 · AIP conference proceedings · 0 citations

An introduction to out-of-plane physics

The objective of this paper is to provide a short introduction of some of the theoretical issues in out‐of‐plane (e,e’X) reactions. To this end, a general form of the cross section for such reactions is presented and discussed within the context of three examples of such processes.