Photograph of the exterior of the Hurley Administration Building at North Texas State University. The photograph, apparently taken from the roof of another building, depicts the Administration Building's north side and main entrance. In the left foreground is the Information Sciences Building; the Biology Building is visible in the right foreground. In the left background behind the Administration Building is the Kerr Hall dormitory complex; the A. M. Willis Library is visible in the right background. People are visible on the concrete walking path leading to the Administration Building.

Photograph of the exterior of the Hurley Administration Building at North Texas State University. This photograph, apparently taken from the roof of another building, depicts the Administration Building's north side and main entrance. In the left foreground is the Information Sciences Building; the Biology Building and Chemistry Building are visible in the right foreground. In the left background behind the Administration Building is the Kerr Hall dormitory complex; the A. M. Willis Library is visible in the right background. People are visible on the concrete walking paths leading through the campus.

Photograph of the exterior of the Hurley Administration Building at North Texas State University. This photograph, apparently taken from the roof of another building, depicts the Administration Building's north side and main entrance. In the left foreground is the Information Sciences Building; the Biology Building and Chemistry Building are visible in the right foreground. In the left background behind the Administration Building is the Kerr Hall dormitory complex; the A. M. Willis Library is visible in the right background. People are visible on the concrete walking paths leading through the campus.

Photograph used for a story in the Daily Oklahoman newspaper.

Photograph used for a story in the Daily Oklahoman newspaper.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Whiling away the time at the energy cycle is Carole Hicks, as her escort Brian Griffin looks on.."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jeanne Smith, ticket chairman for the Urban League's annual Ebony Fashion Fair, left; Ann Monroe, co-chairman, center, and Juanita V. Harris, general chairman, admire the posters and programs telling of the "Color Explosion" slated for 8 p.m. Saturday in Douglass High School Auditorium."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Kay Huff"

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Mary Crawford, a junior at Douglass High School, 900 N. Eastern, grips a rubber bone as she donates a pint of blood during the school's recent blood drive, while Tanya Griffin, also a junior, makes sure everything goes OK."

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

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Former Democratic precinct chairwoman Dosha Lipp offers a cookie to political newcomer Clint Cain at Tuesday night's caucus in the Oklahoma City home of Beverly Sherman Busch, right."

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 set of first-order differential state equations is developed from taking finite differences of the partial differential equation that describes groundwater flow during a pump-drawdown test. The number of states in the model is a direct function of the number of discrete spatial segments used in the approximate model. This number of states is studied to determine a reasonably low-order model that preserves the accuracy of resulting simulations when compared with an available analytical solution. The resulting reduced-order model is then used in an extended Kalman filter for combined state and parameter estimation. This report summarizes work done in a recent pilot study to demonstrate the feasibility of these techniques in groundwater research and points the way toward other approaches to this problem area now under study.

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.

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.

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.

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.