The effect of particle shape on char burnout is investigated in the limit of shrinking core combustion. As a first step, the particle temperature is assumed to proceed in the shrinking core regime and under conditions of negligible Stefan flow. The problem then reduces to calculating the oxygen concentration field around a non-spherical particle with the oxidation reaction taking place on the external surface. This problem has been addressed by an analytical technique and a numerical technique. An analytical technique known as domain perturbation'' was used to examine the change due to reaction in the shape of a slightly nonspherical, but axisymmetric, particle. It was found that the aspect ratio always increases with conversion, i.e., the particle becomes less spherical. A numerical technique, based on the boundary integral'' method was developed to handle the case of an axisymmetric particle with otherwise arbitrary shape. Numerical results are presented which again show the aspect ratio to increase with conversion. 8 refs.

To better understand the flotation behavior of coal pyrite, studies have been initiated to characterize the floatability of coal pyrite and mineral pyrite. The hydrophobicity of coal material pyrite was examined over a range of pH and oxidation times. The results indicate that surface oxidation plays an important role in coal and mineral pyrite hydrophobicity. The hydrophobicity of mineral pyrite decreases with increasing oxidation time (20 min. to 5 hr.) and increasing pH (pH 4.6 to 9.2), with maximum depression occurring at pH 9.2. However, coal pyrite exhibited low floatability, even at the lowest oxidation time, over the entire pH range. X-ray photoelectron spectroscopy (XPS) results suggest the growth of an oxidized iron layer as being responsible for the deterioration in floatability, while a sulfur-containing species present on the sample surfaces may promote floatability. Preliminary studies of the effect of frother indicate an enhancement in the floatability of both coal and mineral pyrite over the entire pH range.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Home buyers want to know efficiency ratings of air conditioners and furnaces," said builder Steve Cook."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A U.S. Air Force jet fighter crash-landed Wednesday at the Seminole Municipal Airport, but both occupants walked away from the wrecked plane after it scooted about 400 yards past the end of the runway and hurdled a fence."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Susan Hermes gives Leon Royer a flower."

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

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter about a group of SCLC members grouped together and singing and a brief interview with a man about homeless people and housing them. This story aired at 6pm.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story Portrait by reporter Ramona Logan about Bobby Kresge who makes stuffed toys for children at a Baylor rehabilitation center.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A $1.5 million remodeling is underway at North Park Mall, 12100 N May."

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Jurisdiction of a justice of the peace court or municipal court to try a 15- or 16-year old defendant for a Class C misdemeanor offense charged under chapter 106 of the Texas Alcoholic Beverage Code.

To better understand the flotation behavior of coal pyrite, studies have been initiated to characterize the floatability of coal pyrite and mineral pyrite. The hydrophobicity of coal material pyrite was examined over a range of pH and oxidation times. The results indicate that surface oxidation plays an important role in coal and mineral pyrite hydrophobicity. The hydrophobicity of mineral pyrite decreases with increasing oxidation time (20 min. to 5 hr.) and increasing pH (pH 4.6 to 9.2), with maximum depression occurring at pH 9.2. However, coal pyrite exhibited low floatability, even at the lowest oxidation time, over the entire pH range. X-ray photoelectron spectroscopy (XPS) results suggest the growth of an oxidized iron layer as being responsible for the deterioration in floatability, while a sulfur-containing species present on the sample surfaces may promote floatability. Preliminary studies of the effect of frother indicate an enhancement in the floatability of both coal and mineral pyrite over the entire pH range.

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

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

Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Capt. Curtis Ogle of the Yukon Fire Department demonstrates cardiopulmonary resuscitation (CPR) to Yukon school bus driver Carolyn Dachille, left, and Karen Rice during a recent CPR Heart-Saver Course."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oneday Adela Rojas was asked by a working friend to baby-sit. Child care Provider"

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Roy Bean is Rodolfo and Sara Seglem is Mimi in "La Boheme."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "There's been quite a turnaround in the last 15 years, ever since the Arab fuel embargo," said builder Dale Terrell. "Home buyers are conscious of energy efficiency. They want to keep their energy costs down. We're running out and the cost will go up."

Biweekly student newspaper published in Hurst, Texas serving the Tarrant County Junior College District that includes school news and information along with advertising.

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.

Weekly newspaper from San Diego, Texas 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.