The local structure at individual ion sites in simple and multicomponent glasses is simulated using methods of molecular dynamics. Computer simulations of fluoroberyllate glasses predict a range of ion separations and coordination numbers that increases with increasing complexity of the glass composition. This occurs at both glass forming and glass modifying cation sites. Laser-induced fluorescence line-narrowing techniques provide a unique probe of the local environments of selected subsets of ions and are used to measure site to site variations in the electronic energy levels and transition probabilities of rare earth ions. These and additional results from EXAFS, neutron and x-ray diffraction, and NMR experiments are compared with simulated glass structures.

Photograph used for a story in the Oklahoma Times newspaper. Caption: "J. Jay nickers a horsey greeting."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Mrs. John Hefner, left, and Billie Fogarty use some of their time over the weekend to help decorate portions of NW 18 for the fourth of July, including this smiling Ben Franklin at 311 NW 18."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Bianche and Carl Hampton sit a spell to rest, cool off and admire their garden."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Allen Greeson, a former executive with the TG&Y Stores Co., has announced that he will run for state auditor."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "During Thursday night's auction to raise funds for a jogging track around Lake Hefner Judy Harrison modeled a Seiko watch which was later auctioned off."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Hampton says sweet corn is best raw, right off the stalk."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Hampton guides his well-balanced garden tiller with only one hand."

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Judge Creston Williams holds marriage license after pronouncing Mike and Janna Day, center, man and wife."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "John Henry Davis, a retired plumber, calls Chickasha ' A swell place to live.' He moved here 35 years ago."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Hampton picks up his crop of potatoes after digging them out of the earth."

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Ray Hibdon, one of the co-owners of Hibdon Tire Centers"

Photograph used for a story in the Oklahoma Times newspaper. Caption: "One-third of a gigantic BLT sandwich ripens on the vine."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Joanna Hogan"

Photograph used for a newspaper owned by the Oklahoma Publishing Company.

Photograph used for a newspaper owned by the Oklahoma Publishing Company.

Photograph used for a newspaper owned by the Oklahoma Publishing Company.

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Commands are conveyed to J. Jay without Browning ever saying a word."

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

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

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

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

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Robert Olive, 2, waves his flag."