Sevenfold Coordinated MgSe: Experimental Internal Atom Position Determination to 146 GPa, Diffraction Studies to 202 GPa, and Theoretical Studies to 500 GPa

Experimental and theoretical studies on the elasticity of molybdenum to 12 GPa

Experiments have been conducted to measure compressional VP and shear wave VS velocities as well as unit-cell volumes densities of molybdenum to 12.0 GPa at room temperature using ultrasonic interferometry in conjunction with synchrotron x-radiation. Both VP and VS as well as the adiabatic bulk KS and shear G moduli exhibit monotonic increase with increasing pressure. A finite strain equation o...

High pressure structural studies on Nb5Si3 up to 26.2 GPa

Sectroscopic Studies of p - H 2 to above 200 GPa

Raman and infrared vibrational spectra of H2 have been measured to pressures in excess of 200 GPa and at liquid helium temperatures using new high sensitivity techniques. Detailed study of the pressure dependence of op conversion rate reveals an initial increase followed by a decrease above 1 GPa. The conversion rate then increases dramatically with pressure, and this continues to above 50 GPa....

Brillouin scattering and X-ray diffraction of San Carlos olivine: direct pressure determination to 32 GPa

The single-crystal elastic moduli of San Carlos olivine, (Mg0.9Fe0.1)2SiO4, were determined at seven pressures between 2.5 and 32.5 GPa by Brillouin spectroscopy in a diamond anvil cell. The unit cell volume was also determined at each pressure (and ambient pressure) by single-crystal X-ray diffraction. The shear elastic moduli exhibit non-linear pressure dependencies. In particular, a non-line...

Adjusting GPA to Reflect Course Difficulty

The computation of Graduate Point Average (GPA) incorrectly assumes that grades are comparable across courses and instructors. GPA overstates the performance of students who elect an “easier” course of study relative to those who choose a more “difficult” course of study. This paper proposes a method of adjusting GPA and applies it to data from one cohort of undergraduates at Carnegie Mellon Un...