A clipping of articles from the 'Back-to-School' section of the newspaper The Post-Signal. The main article lists out the several programs in operation within the Pilot Point Elementary School, including the new UNT NTIEVA program funded by the Getty Foundation.

An article titled 'Local art program in fifth year' that was written for The Post-Signal newspaper. The article covers the NTIEVA program within Pilot Point's school district and how it has been implemented over the past five years.

Tritium behavior in ceramic breeder blankets is a key design issue for this class of blanket because of its impact on safety and fuel self-sufficiency. Over the past 10-15 years, substantial theoretical and experimental efforts have been dedicated world-wide to develop a better understanding of tritium transport in ceramic breeders. Models that are available today seem to cover reasonably well all the key physical transport and trapping mechanisms. They have allowed for reasonable interpretation and reproduction of experimental data and have helped in pointing out deficiencies in material property data base, in providing guidance for future experiments, and in analyzing blanket tritium behavior. This paper highlights the progress in tritium modeling over the last decade. Key tritium transport mechanisms are briefly described along with the more recent and sophisticated models developed to help understand them. Recent experimental data are highlighted and model calibration and validation discussed. Finally, example applications to blanket cases are shown as illustration of progress in the prediction of ceramic breeder blanket tritium inventory.

Manganese K-edge X-ray absorption spectra are used to examine the average oxidation state and local structure of new synthetic manganese oxide photocatalysts, including the materials known as octahedral molecular sieves. The structures of these materials are compared to the natural minerals cryptomelane and todorokite.

XAMath is a graphics-based interactive package written with the Mathematica{reg_sign} system for the analysis of XAFS data. Mathematica{reg_sign} offers the advantage of use on several computer platforms, including Unix, IBM Windows, and Macintosh, without any modification of the program. The portability and flexibility of this software has some cost in speed of execution.

Dimethyl sulfoxide (DMSO) sprays are being used to remove the high explosive (HE) from nuclear weapons in the process of their dismantlement. A boxed 50 cfm HEPA filter with an integral prefilter was exposed to DMSO vapor and aerosols that were generated by a spray nozzle to simulate conditions expected in the HE dissolution operation. After 198 hours of operation, the pressure drop of the filter had increased from 1.15 inches to 2.85 inches, and the efficiency for 0.3 {mu}m dioctyl sebacate (DOS) aerosols decreased from 99.992% to 98.6%. Most of the DMSO aerosols had collected as a liquid pool inside the boxed HEPA. The liquid was blown out of the filter exit with 100 cfm air flow at the end of the test. Since the filter still met the minimum allowed efficiency of 99.97% after 166 hours of exposure, we recommend replacing the filter every 160 hours of operation or sooner if the pressure drop increases by 50%. Examination of the filter showed that visible cracks appeared at the joints of the wooden frame and a portion of the sealant had pulled away from the frame. Since all of the DMSO will be trapped in the first HEPA filter, …

In 1991, LLNL was asked by the NRC to provide technical assistance in various aspects of computer technology that apply to computer-based reactor protection systems. This has involved the review of safety aspects of new reactor designs and the provision of technical advice on the use of computer technology in systems important to reactor safety. The latter includes determining and documenting state-of-the-art subjects that require regulatory involvement by the NRC because of their importance in the development and implementation of digital computer safety systems. These subjects include data communications, formal methods, testing, software hazards analysis, verification and validation, computer security, performance, software complexity and others. One topic software reliability and safety is the subject of this paper.

We present the design and implementation of a very compact adaptive optic system that senses the return light from a sodium guide-star and controls a deformable mirror and a pointing mirror to compensate atmospheric perturbations in the wavefront. The deformable mirror has 19 electrostrictive actuators and triangular subapertures. The wavefront sensor is a Hartmann sensor with lenslets on triangular centers. The high-bandwidth steering mirror assembly incorporates an analog controller that samples the tilt with an avalanche photodiode quad cell. An {line_integral}/25 imaging leg focuses the light into a science camera that can either obtain long-exposure images or speckle data. In laboratory tests overall Strehl ratios were improved by a factor of 3 when a mylar sheet was used as an aberrator. The crossover frequency at unity gain is 30 Hz.

We discuss the use of a prepulse technique to achieve lasing in low-Z neon-like ions on the 3p {yields} 3s(J = 0 {yields} 1) transition. In neon-like titanium(Z=22), chromium(Z=24), iron(Z=26), nickel(Z=28), zinc(Z=30), and germanium(Z=32) this transition lases at 326, 285, 255, 231, 212 and 196 {Angstrom} respectively. We present results using this technique on selenium(Z=34) and show how the J = 0 {yields} 1 transition at 182 {Angstrom} suddenly becomes a strong line. The observation that the low-Z ions with odd Z have not lased lead us to investigate the potential impact of hyperfine splitting on the laser gain. In our experiments we measure the lineshape of the 3p {yields} 3s(J = 0 {yields} 1) transition in neon-like niobium and zirconium and observe a 28 m{Angstrom} splitting between the two largest hyperfine components in the niobium(Z=41) line at 145.9 in good agreement with theory. In zirconium(Z=40), no splitting is observed since the hyperfine effect is proportional to the nuclear moment, and the principal isotopes of zirconium have zero nuclear moment, as is typical for even-Z elements. Finally we discuss the use of low density foams for the laser target and present results which show lasing in zirconium aerogel with an …

High Consequence System Surety is an ongoing project at Sandia National Laboratories. This project pulls together a multi- disciplinary team to integrate the elements of surety into an encompassing process. The surety process will be augmented and validated by applying it to an automated system handling a critical nuclear weapon component at the Mason & Hanger Pantex Plant. This paper presents the development to date of an integrated, high consequence surety process.

Memo detailing the results of a study that found that asprin may inhibit HIV and prevent it from developing into AIDS.

The authors review the extensive evidence from model calculations that neutral holes in an antiferromagnet separate into hole-rich and hole-poor phases. All known solvable limits of models of holes in a Heisenberg antiferromagnet exhibit this behavior. The authors show that when the phase separation is frustrated by the introduction of long-range Coulomb interactions, the typical consequence is either a modulated (charge density wave) state or a superconducting phase. The authors then review some of the strong experimental evidence supporting an electronically-driven phase separation of the holes in the cuprate superconductors and the related Ni oxides. Finally, the authors argue that frustrated phase separation in these materials can account for many of the anomalous normal state properties of the high temperature superconductors and provide the mechanism of superconductivity. In particular, it is shown that the T-linear resistivity of the normal state is a paraconductivity associated with a novel composite pairing, although the ordered superconducting state is more conventional.

We have used magnetoresistance measurements to probe the effect of large magnetic fields on the stability of the electronic gap {delta} in SmB{sub 6}. Although the Zeeman splitting in a 18 Telsa field is comparable to the ambient pressure {delta}, and even exceeds {delta} at 56 kbar, {delta} is in both cases almost completely unaffected by the magnetic field.

Real-time neutron radiography has been used to study the dynamic behavior of two-phase flow and measure vapor fractions in a steam-water duct at atmospheric pressure. This unique experimental technique offers one the opportunity to observe and record on videotape now Patterns and transient behavior of two-phase flow inside opaque containers without perturbing the environment. The neutron radiographic technique is non-intrusive and requires no special transparent window region. Data are recorded simultaneously over a large area of interest. Image processing of the video data can be employed to measure bubble velocities and time-averaged and Instantaneous vapor fractions.