This is a mosaic of solar eclipse images secured on May 20, 2012 by Dr. Michael D. Joner. The individual observations were made between 6:59 and 8:06pm MDT a couple of miles northwest of Kanarraville, Utah on the center line of this annular solar eclipse. The entire solar photosphere was not blocked by the passage of the Moon for this eclipse. The result was an annular eclipse due to the fact that the Moon was close to apogee and thus not large enough in the sky to cover the entire Sun. Areas of southern Utah enjoyed perfect weather in addition to being ideally located to view the eclipse well before sunset.
Using the considerable resources of BYU's Marylou Supercomputing Center, we combined two computational approaches to crystal structure prediction. The two methods complement one another and often make predictions of new phases in binary metallic phase diagrams.
The picture above shows a new prediction in Hf-Sc at the stoichiometry of 5:1
This image was secured during the installation of the 0.9-m telescope at the BYU West Mountain Observatory. Data for this image is from August 27, 2009. This was the first night that a CCD had been mounted on the telescope so that imaging was possible. This 'First Light' image shows the globular cluster known as M15 in the constellation of Pegasus. The distance to this cluster is more than 33,000 light years and yet individual stars are easily resolved all through the cluster. Globular cluster stars have an extremely low abundance of heavy elements as compared to stars found in the solar neighborhood and represent the oldest population of stars known in the Galaxy. It is interesting to note the many cool red giant stars that are visible in the cluster as well as a large number of evolved horizontal branch stars that are blue in color. Many of the horizontal branch stars are known to be RR Lyrae variable stars that are useful as distance indicators since it is possible to determine their luminosity and compare that value to their apparent magnitude as measured from the observed images. The color image processing for this picture is the work of Dr. Rob Gendler. Dr. Gendler is well known for producing amazingly detailed astronomical images that are regularly featured on the NASA Astronomy Picture of the Day.
The experimental and computational data on rhodium binary alloys is sparse despite its importance in numerous applications, especially as an alloying agent in catalytic materials. Half of the Rh-transition metal systems (14 out of 28) are reported to be phase separating or are lacking experimental data. We predicted stable ordered structures in 9 of those 14 binary systems. We also found a few unreported compounds in the known compound-forming systems. There needs to be an extensive revision of the current understanding of Rh alloys through a combination of theoretical predictions and experimental validations.
Crystal transformations that reduce symmetry are called "distortions". ISODISTORT (iso.byu.edu) is a powerful group-theoretical tool that can generate, parameterize, and interactively visualize virtually any crystal distortion involving atomic displacements, magnetic moments, occupational orderings, or lattice strains. Figure based on La2CoRuO6 (J. Mater. Chem. 15, 715-720, 2005).
Scott Sommerfeldt et al. recently published an article titled "Generalized acoustic energy density based active noise control in single frequency diffuse sound fields" in Journal of The Acoustical Society of America. Click on the image above to read it.