Junior Recital

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A Geophysical Study of the Easternmost Piedmont: Brunswick County, Virginia

Gravity and magnetic models indicate that a steeply dipping, mylonitic shear zone recognized by reconnaissance mapping in the easternmost Piedmont of Brunswick County, Virginia is a listric fault. A pronounced 3 to 5 mgal Bouguer anomaly high is associated with the fault zone. A band of N10° trending aeromagnetic anomalies delineate the areal extent of the fault zone. The fault zone flattens eastward over a short distance to a depth of 15 kms where it joins a near horizontal surface that cuts across the region. This surface is herein interpreted to be a decollement. The fault zone of this study is interpreted to be a part of the Eastern Piedmont Fault System (EPFS) of Hatcher et al (1977). Listric geometry of this fault suggests it is a splay off the master decollement responsible for the Appalachian fold and thrust belt to the west. Inclusion of the fault of this study in the EPFS suggests the EPFS faults may also be listric

The Mass Profile of the Milky Way to the Virial Radius from the Illustris Simulation

We use particle data from the Illustris simulation, combined with individual kinematic constraints on the mass of the Milky Way (MW) at specific distances from the Galactic center, to infer the radial distribution of the MW's dark matter halo mass. Our method allows us to convert any constraint on the mass of the MW within a fixed distance to a full circular velocity profile to the MW's virial radius. As primary examples, we take two recent (and discrepant) measurements of the total mass within 50 kpc of the Galaxy and find they imply very different mass profiles and stellar masses for the Galaxy. The dark-matter-only version of the Illustris simulation enables us to compute the effects of galaxy formation on such constraints on a halo-by-halo basis; on small scales, galaxy formation enhances the density relative to dark-matter-only runs, while the total mass density is approximately 20% lower at large Galactocentric distances. We are also able to quantify how current and future constraints on the mass of the MW within specific radii will be reflected in uncertainties on its virial mass: even a measurement of M(<50 kpc) with essentially perfect precision still results in a 20% uncertainty on the virial mass of the Galaxy, while a future measurement of M(<100 kpc) with 10% errors would result in the same level of uncertainty. We expect that our technique will become even more useful as (1) better kinematic constraints become available at larger distances and (2) cosmological simulations provide even more faithful representations of the observable Universe.Comment: 11 pages, 8 figures; matches version published in MNRA

Senior Recital

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Metal Recovery Using Oxalate Chemistry: A Technical Review

Energy-efficient metal recovery and separation processes from a mixture of valuable metals are vital to the metallurgy and recycling industries. Oxalate has been identified as a sustainable reagent that can provide both the desired selectivity and efficient leaching capabilities for a variety of mixed metals under mild reaction conditions. The oxalate process has a great potential to replace many of the existing metal recovery processes that use inorganic acids such as sulfuric, hydrochloric, and nitric acids. In this Review, the use of oxalate chemistry in four major metal recovery applications is discussed, namely, spent lithium-ion batteries, spent catalysts, valuable ores, and contaminated and unwanted waste streams. Recycling of critical and precious metals from spent lithium-ion batteries and catalysts has significant economic opportunities. For efficient metals recovery, reaction conditions (e.g., temperature, pH, time, and concentration), metal–oxalate complex formation, oxidation and reduction, and metal precipitation must all be well-understood. This Review provides an overview from articles and patents for a variety of metal recovery processes along with insights into future process development

A Chatbot Tutor Can Lessen the Gender Confidence Gap in Information Systems Learning

Women are underrepresented in the information systems discipline as well as other STEM fields. A common explanation for the significant gender gap is the difference in women’s and men’s self-efficacy concerning information systems (IS) tasks and roles during their secondary education. As a potential solution, this study explores how chatbot tutors impact confidence differently between 136 women and men in an introductory programming course. Our findings confirmed prior research showing that while men have greater confidence in information systems tasks, there is no difference in performance in those tasks between women and men. Next, we found that a chatbot used during learning can improve confidence of all students. Finally, and most importantly, we found that the effect of a chatbot tutor is stronger for women than for men. Therefore, chatbot may be a valid tool to lessen the gender gap in the information systems discipline

Junior Recital

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Master Recital

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Junior Recital

List of performers and performances

Senior Recital

Program listing performers and works performe