Horn Studio Recital

Horn Studio Recital Students of Dr. Patrick Smith with James Dorn, pian

Senior Recital, Michael Dickinson, trombone

The presentation of this senior recital will fulfill in part the requirements for the Bachelor of Music degree in Performance. Michael Dickinson studies trombone with Dr. Ross Walter

Junior Recital, Michael Dickinson, bass trombone

The presentation of this junior recital will fulfill in part the requirements for the Bachelor of Music degree in Performance. Michael Dickinson studies bass trombone with Dr. Ross Walter

Junior Recital, Bryan Gonzalez, trombone

Junior RecitalBryan Gonzalez, trombonewith James A. Dorn, pianoTuesday, April 30, 2019 at 6:30pmSonia Vlahcevic Concert Hall / W.E. Singleton Center for the Performing Arts922 Park Avenue / Richmond, VaThe presentation of this junior recital will fulfill in part the requirements for the Bachelor of Music degree in Performance. Bryan Gonzalez studies trombone with Dr. Ross Walter

Can we constrain interior structure of rocky exoplanets from mass and radius measurements?

We present an inversion method based on Bayesian analysis to constrain the interior structure of terrestrial exoplanets, in the form of chemical composition of the mantle and core size. Specifically, we identify what parts of the interior structure of terrestrial exoplanets can be determined from observations of mass, radius, and stellar elemental abundances. We perform a full probabilistic inverse analysis to formally account for observational and model uncertainties and obtain confidence regions of interior structure models. This enables us to characterize how model variability depends on data and associated uncertainties. We test our method on terrestrial solar system planets and find that our model predictions are consistent with independent estimates. Furthermore, we apply our method to synthetic exoplanets up to 10 Earth masses and up to 1.7 Earth radii as well as to exoplanet Kepler-36b. Importantly, the inversion strategy proposed here provides a framework for understanding the level of precision required to characterize the interior of exoplanets. Our main conclusions are: (1) observations of mass and radius are sufficient to constrain core size; (2) stellar elemental abundances (Fe, Si, Mg) are key constraints to reduce degeneracy in interior structure models and to constrain mantle composition; (3) the inherent degeneracy in determining interior structure from mass and radius observations does not only depend on measurement accuracies but also on the actual size and density of the exoplanet. We argue that precise observations of stellar elemental abundances are central in order to place constraints on planetary bulk composition and to reduce model degeneracy. [...]Comment: 19 pages, 18 figures, accepted in Astronomy & Astrophysics (no changes to previous version

Endohedral Metallofullerene Derivatives

Trimetallic nitride endohedral metallofullerene derivatives and their preparation are described. The trimetallic nitride endohedral metallofullerene derivatives have the general formula A(sub 3-n)X(sub n)@C(sub m)(R) where n ranges from 0 to 3, A and X may be trivalent metals and may be either rare earth metal or group IIIB metals, m is between about 60 and about 200, and R is preferably an organic group. Derivatives where the R group forms cyclized derivatives with the fullerene cage are also described

Chamber Brass Recital

Featuring ensembles coached by Rex Richardson, Patrick Smith, and Ross Walter with James Dorn, pian