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

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News release promoting the use of DART transportation services to travel during the holiday season.

News release about DART's planned railroad tunnel serving Dallas Love Field Airport.

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A Wolter X-ray optic was the central component of the microscope envisioned to fulfill the imaging requirements of the Characterization SI. After encountering many difficulties and delays, an optic was finally produced that, unfortunately, only partially met its specifications. With the SI halted, and efforts underway to reformulate a LDRD program to support fabrication of X-ray optics, it is useful to examine the previous effort and compile a list of lessons learned during the research.

The discovery that ultra-intense laser pulses (I > 10{sup 18} W/cm{sup 2}) can produce short pulse, high energy proton beams has renewed interest in the fundamental mechanisms that govern particle acceleration from laser-solid interactions. Experiments have shown that protons present as hydrocarbon contaminants on laser targets can be accelerated up to energies > 50 MeV. Different theoretical models that explain the observed results have been proposed. One model describes a front-surface acceleration mechanism based on the ponderomotive potential of the laser pulse. At high intensities (I > 10{sup 18} W/cm{sup 2}), the quiver energy of an electron oscillating in the electric field of the laser pulse exceeds the electron rest mass, requiring the consideration of relativistic effects. The relativistically correct ponderomotive potential is given by U{sub p} = ([1 + I{lambda}{sup 2}/1.3 x 10{sup 18}]{sup 1/2} - 1) m{sub o}c{sup 2}, where I{lambda}{sup 2} is the irradiance in W {micro}m{sup 2}/cm{sup 2} and m{sub o}c{sup 2} is the electron rest mass. At laser irradiance of I{lambda}{sup 2} {approx} 10{sup 20} W {micro}m{sup 2}/cm{sup 2}, the ponderomotive potential can be of order several MeV. A few recent experiments--discussed in Chapter 3 of this thesis--consider this ponderomotive potential sufficiently strong to accelerate …

We focus on improving the angular discretization of the angular flux for the one-dimensional (1D) spherical geometry neutron transport equation. Unlike the conventional SN method, we model the angular dependence of the flux with a Petrov-Galerkin finite element approximation for the differencing of the angular variable in developing the 1D spherical geometry S{sub N} equations. That is, we use both a piecewise bi-linear and a quadratic function in each angular bin to approximate the angular dependence of the flux. This new algorithm that we have developed shows faster convergence with angular resolution than conventional SN algorithms. (U)

An energy-dependent bond-breaking model for material failure is described. The logic of the scheme has its roots in that of the Cochran- Banner spall model [Cochran and Banner, 1977], but significant differences have been introduced. Material zones undergoing tensile stress incur damage according to an exponential expression related to the familiar Maxwell-Boltzmann distribution. A scheme for converting the damage calculated in specified contiguous zones of the mesh into a 'strength factor' for each subject zone is included as a means to account for statistical variability in the location and extent of the failure region. A dynamical healing algorithm is also described. To date the method has been tried only in 1-D slab symmetry, but it is intended for general use in mesh-zoned hydro codes of any dimensionality.

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

Email from Sherry Ringler to Eleanor Brown discussing Brown's award from the TX Hall of Fame, Ringler's recent visit to Washington, D.C. with Caro Bosca, and the WWII Memorial Ceremony to be held in April 2005.

Interview with James H. Gilbert, a member of the 1st Airborne Cavalry, 82nd Airborne Division during the Vietnam War. Gilbert gives lengthy answers and descriptions concerning his time in Vietnam, action he saw, weaponry, etc. Gilbert also shares some memorable stories, and his feelings towards the war as it was happening and in hindsight.