Comprehensive understanding of chemical transport in response to fluid flow and diffusion in geologic processes requires thermodynamic and transport properties of a wide variety of aqueous species at the temperature and pressure of interest, as well as mass transfer computer codes that provide simultaneously for fluid flow, diffusion, dispersion, homogeneous chemical reactions, and mineral solubilities. As a result of research carried out with support from DOE in prior years of this grant, considerable progress has been made in developing computer codes to calculate advective-dispersive-diffusional transport at both high and low pressures and temperatures. These codes have become highly sophisticated, but their application to geochemical processes is limited by the availability of thermodynamic and transport data for the major solute species in the aqueous phase. Over the past three years, research has been directed primarily toward characterizing the thermodynamic behavior of concentrated supercritical aqueous electrolyte solutions and predicting the diffusion coefficients of organic species in oil field brines. Related research has been concerned with characterizing the growth rate of hydrothermal alteration zones and assessing the relative importance of aqueous diffusion and heterogeneous reactions at mineral surfaces in geochemical processes. 103 refs., 12 figs.

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

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

Significant progress has been made toward solving the century-old problem of chromatic aberrations in diffractive optics. Our approach exploits modern materials and microfabrication technology and is very different from the purely diffractive strategy,'' which is commonly employed and which results in multiple diffractive elements separated by a finite distance. We have developed a Fresnel zone plate lens comprised of a serial stack of patterned minus-filters which allows broadband radiation to be focused (or imaged) without longitudinal or transverse chromatic aberrations. 7 refs., 4 figs.

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

Newspaper clipping of the article, "Columbus-King holiday swap sparks ethnic groups' protest" discussing the reaction of Hispanic and Italian-American cultural groups to the bill instituting Martin Luther King, Jr. Day as a paid holiday and eliminating Columbus Day as a paid holiday.

Newspaper clipping of the article, "Columbus still has his backers," in the Houston Post discussing a recent press conference held by Houston-area Hispanics, Italians, and the Christopher Columbus Quincentenary Texas Jubilee Commission to protest the state legislature's decision to replace Columbus Day with Martin Luther King, Jr. Day as a paid holiday for state employees.

Newspaper clipping of the article, "Italian-Americans, Hispanics irked by holiday change" in San Antonio Light, discussing the reactions of the Italian-American and Hispanic communities to replacement of Columbus Day with Martin Luther King, Jr. Day as an official paid holiday for state employees.

Newspaper clipping of the "Other Bills" section of the San Antonio Light, listing the status of bills in the most recent session of the state legislature with a brief discussion of each bills' contents. The passed bills include recognizing Martin Luther King, Jr. Day, insurance reform, and oil spill response.

Significant progress was made in the May 1990--May 1991 contract period in three primary coal liquefaction research areas: catalysis, structure-reactivity studies, and novel liquefaction processes. A brief summary of the accomplishments in the past year in each of these areas is given.

A fax letter from Marilyn Stewart to Nancy Cason about their presentation schedule for an upcoming seminar

Funeral program for Lewis Edward Green, born May 11, 1940 and died May 25, 1991. The funeral was held May 28, 1991 at New Mount Pleasant Baptist Church, officiated by Rev. J. Carlton Allen. The funeral arrangements were made through the Lewis Funeral Home and he was buried in Fort Sam Houston National Cemetery near San Antonio, Texas.

Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.

Application materials submitted to the Texas Historical Commission requesting a historic marker for the Infant Jesus of Prague Catholic Church, in Victoria, Texas. The materials include the inscription text of the marker, narrative, and photographs.

Interview with Dr. Odo Turowski, consultant for businesses in Eastern Europe. In the interview, Dr. Turowski discusses his life growing up in east Germany, escaping to west Germany, and the reunification of his country after the fall of the Berlin Wall.

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.

B-roll 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. This story aired at 5 P.M.

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. This story aired at 6 A.M.