One of the major problems needing consideration when bringing a geothermal field into production is the anticipation and control of mineral precipitation in both the producing formations and production equipment. Prediction of the chemical interactions between natural multicomponent thermal fluids and the minerals comprising a producing formation can be accomplished by the study of equilibrium models approximating the natural system. Models are constructed from theoretically and experimentally derived thermodynamic data for the involved minerals and aqueous species. This equilibrium modeling approach was applied to the rock-water system at the East Mesa geothermal area in the Imperial Valley of California. Results of petrographic and fluid analyses are given. (JGB)

Photograph taken during daylight of three fire fighters on a rooftop managing a structural fire.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A stack-out boom pours thousands of tons of coal into black heaps as stockpiling continues in preparation for the start-up of new giant power generating units."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Cutting out a pattern is Mrs. Ralph Herz, president of the Downtown Rotary Anns, auxiliary to the Rotary Club."

Caption: "Carnival area clean-up."

Photograph taken for a story in the Daily Oklahoman newspaper. Caption: "Workers Monday began picking up and hauling away a portion of the approximately 100 tons of debris left behind by visitors to the 70th annual State Fair of Oklahoma."

Semi-weekly newspaper from Clarksville, Texas that includes local, state, and national news along with advertising.

A focusing system which utilizes two f/0.47 doublets in conjunction with ellipsoidal mirrors produces two focusing cones with half angles of 81.5/sup 0/. This system has been used with the LLL Janus laser system to irradiate and implode DT filled glass microshells approximately 80 ..mu..m diameter. The purpose of the system was to provide more uniform heating of the pusher and compression of the fuel than had been obtained with Janus irradiated targets using f/1 lenses. Neutron yields of approximately 10/sup 7/ per event have been obtained and x-ray micrographs indicate tha the heating of the pusher was more uniform. Also the implosions are definitely more spherical than those obtained with the f/1 lenses. Data is also presented which add further confirmation to the importance of absorption by plasma wave resonance for non normal incidence of the laser light with the target.

To determine the feasibility of recovering data actively from x-ray imaging instruments used in the Lawrence Livermore Laboratory Laser Fusion Program, a commercial silicon video sensor was used to detect patterns of soft x-rays (1-8 keV). The sensor is a 2-dimensional frame transfer charge coupled device (CCD), modified to allow direct access of x-rays to the sensitive silicon. The x-ray sensitivity, linearity, and dynamic range of the CCD are discussed.

The need in clinical nuclear medicine for imaging devices with high spatial resolution has been discussed at length for many years. More recently, specialists in cardiology and neurology have restated this need for greater resolution in order to effect earlier or more accurate diagnoses of brain tumors, cerebral and myocardial ischemia and infarcts and septum defects, among others. Our approach to filling this need is to ultimately develop a 3072-element, high-purity germanium camera with a 2-mm spatial resolution, an energy resolution of 2 to 3 percent for /sup 99m/Tc, and a clinically useful area of 123 cm/sup 2/ for imaging the average adult heart, breast or brain. To this end, a 100-element prototype has been constructed and images of rats and mice have been obtained with the use of single and multiple isotopes. A second prototype with 512 elements has also been completed and tested. The 512 elements are derived from an array of electrodes, on the bottom of two germanium crystals, orthogonal to 16 electrodes on the top. The top electrodes are electrically in parallel and have a common electronic readout. The p-contact is palladium over germanium oxide, and the n-side is gold over the lithium diffusion. Cooling for …

As part a program to study the mechanism of detonation in explosives, the effect of a pulse of high-energy electrons on an explosive's detonation velocity was examined. A short, intense burst of 1.1-MeV electrons was directed onto a specimen of XTX-8003 explosive in a narrow track as a detonation wave was passing along it. No change in the detonation velocity resulted from an electron energy fluence of 1.4 J/cm/sup 2/.

Experiments were performed on the Janus laser with ..cap alpha..- spherical illumination system producing very nearly uniform energy deposition on microscopic laser fusion targets. The target performance as measured by the thermonuclear reaction yield was increased by a factor of 2.5 over experiments performed with f/1 lenses. Simple considerations of useful absorbed energy together with ..cap alpha..-particle time-of-flight measurements indicate that the D-T ion temperatures were not increased over those of earlier experiments. The increased neutron yield is thus to first order caused by the greater uniformity of compression achieved. Measurements of absorption as a function of focal overlap of the ellipsoidal mirrors support the hypothesis that resonance absorption plays an important role in these laser fusion experiments.

Field equations solved by the beam propagation code EMPULSE are presented, including their derivation from the underlying Maxwell equations. The code treats a highly relativistic charged particle beam propagating in a gas--plasma medium characterized by scalar conductivity. (JFP)

Photograph of Doug Vair, Ward Andrews, Russ Bloxom, Chip Moody, and Harold Taft on set. Four of them can be seen seated behind a large desk while Taft is standing to the right. They are all looking and smiling at the camera. Everyone is dressed in suits and ties. On the wall to the right, there are weather patterns on a map and weatherboard. Lights are visible in the ceiling.

Photograph of Doug Vair, Ward Andrews, Russ Bloxom, Chip Moody, and Harold Taft on set. Four of them can be seen seated behind a large desk while Taft is standing to the right. They are all looking to the right of the camera. Everyone is dressed in suits and ties. On the wall to the right, there are weather patterns on a map and weatherboard. Lights are visible in the ceiling.

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

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

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

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "With generating units forming a backdrop, coal-loaded gondolas edge along the tracks at OG&E's Muskogee plant."

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "OU Football"

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "OU Football"

Photograph used for a story in the Oklahoma Times newspaper. Caption: "James N. Lang, left, and Hong M. Kim, Oklahoma State University physics professors are spearheading a 10-year research study of the acoustical delay properties of crystalline materials."

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "OU Football"

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Ronald Reagan - City visit"