Excitons are of fundamental interest and of importance foropto-electronic applications of bulk and nano-structured semiconductors.This paper discusses the utilization of ultrafast terahertz (THz) pulsesfor the study of characteristic low-energy excitations of photoexcitedquasi 2D electron-hole (e-h) gases. Optical-pump THz-probe spectroscopyat 250-kHz repetition rate is employed to detect characteristic THzsignatures of excitons and unbound e-h pairs in GaAs quantum wells.Exciton and free-carrier densities are extracted from the data using atwo-component model. We report the detailed THz response and pairdensities for different photoexcitation energies resonant to heavy-holeexcitons, light-hole excitons, or the continuum of unbound pairs. Suchexperiments can provide quantitative insights into wavelength, time, andtemperature dependence of the low-energy response and composition ofoptically excited e-h gases in low-dimensionalsemiconductors.

Poster/flyer advertising a concert by Hardin Sweaty and the Ready to Go with Teenage Symphony, Swim Swim, and New Science Projects on September 2, 2006, at Club Dada in Dallas, TX.

Funeral program for Mrs. John Etta Slaughter, born November 3, 1929 and died August 30, 2006. The funeral was held Saturday, September 2, 2006 at St. Philip's Episcopal Church, officiated by Reverend Dr. Milbrew Davis. Funeral arrangements were made through Sutton-Sutton Mortuary, Incorporated and she was buried in Fort Sam Houston National Cemetery near San Antonio, Texas.

Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Master of Music (MM) degree.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Handwritten notes were taken during a Lone Star Ride Fighting AIDs organization meeting, September 2, 2006.

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.

In this talk, I briefly review several models of the heavy quarkonium production at collider energies, and discuss the status of QCD factorization for these production models.

For this after dinner talk I intersperse images of real lattices with a discussion of the motivations for lattice gauge theory and some current unresolved issues.