Moessbauer Spectroscopy (MS) studies of {sup 119}Sn were carried out in antiferromagnetic La{sub 2}(Cu{sub 0.99}Sn{sub 0.01})O{sub 4} (214) and in superconducting GdBa{sub 2}(Cu{sub 0.99}Sn{sub 0. 01}){sub 3}O{sub 7} (123). Non-magnetic Sn{sup 4+} substitutes for Cu if the right procedure for diffusing {sup 119}SnO{sub 2} in CuO is carried out. Studies performed in 214 show a large quadrupole splitting (QS) down to 120 K followed by an onset of a magnetic interaction reaching a saturation internal field of H{sub eff} = 8.7(5) KOe at T = 30 K. From the combined magnetic-quadrupole interaction the angle {theta} formed by q{sub zz} and H{sub eff}, the {eta}-parameter, and the sign of QS were deduced and information on the local spin structure is derived. Studies conducted with the 123 material (T{sub c} = 90 K) reveal a broad unsplit line at temperatures down to 60 K followed by an abrupt onset of a magnetic interaction corresponding to H{sub eff} (Sn) = 8.3 (7) KOe. The hyperfine field decreases with decreasing temperature reaching 6.0(1) KOe at 16 K. The onset of the magnetic interaction at the {sup 119}Sn nucleus is explained as due to a local depletion of holes following the Sn{sup 4+} doping and …

This draft report was prepared as required by Task No. 2 of the US Department of Energy, Grant No. DE-FG07-89ID12850 Reverse Trade Mission to Acquaint International Representatives with US Power Plant and Drilling Technology'' (mission). As described in the grant proposal, this report covers the reactions of attendees toward US technology, its possible use in their countries, and an evaluation of the mission by the staff leaders. Note this is the draft report of one of two missions carried out under the same contract number. Because of the diversity of the mission subjects and the different attendees at each, a separate report for each mission has been prepared. This draft report has been sent to all mission attendees, specific persons in the US Department of Energy and Los Alamos National Lab., the California Energy Commission (CEC), and various other governmental agencies.

The theory of heavy quark production in hadronic reactions is reviewed. Rates for the production of charm, bottom and top quarks at energies of current interest are presented. 34 refs., 19 figs., 2 tabs.

Calculations of non-inductive current drive typically have been used with model MHD equilibria which are independently generated from an assumed toroidal current profile or from a fit to an experiment. Such a method can lead to serious errors since the driven current can dramatically alter the equilibrium and changes in the equilibrium B-fields can dramatically alter the current drive. The latter effect is quite pronounced in LH current drive where the ray trajectories are sensitive to the local values of the magnetic shear and the density gradient. In order to overcome these problems, we have modified a LH simulation code to accommodate elongated plasmas with numerically generated equilibria. The new LH module has been added to the ACCOME code which solves for current drive by neutral beams, electric fields, and bootstrap effects in a self-consistent 2-D equilibrium. We briefly describe the model in the next section and then present results of a study of LH current drive in ITER. 2 refs., 6 figs., 2 tabs.

We investigate some CP-odd correlations which can be used to search for an electric dipole form factor d{sub {tau}}(s) of the {tau} in the reaction e{sup +}e{sup {minus}} {yields} {tau}{sup +}{tau} {sup {minus}} at c.m. energies {radical}s relevant for a {tau}-charm factory. These observables require measurement of the {tau} polarizations. Using the channel e{sup +}e{sup {minus}} {yields} {pi}{sup +} {nu}{sub {tau}}{pi}{sup {minus}}{nu}{sub {tau}} one should be able to measure d{sub {tau}} at {radical}s = 4 GeV with an accuracy {delta}(d{sub {tau}}) {approx equal} 2.5 {times} 10{sup {minus}16}e cm, assuming the production of 10{sup 7} {tau} pairs. The same accuracy can be reached with 10{sup 6} {tau} pairs at {radical}s = 10 GeV, the typical c.m. energy of a B-factory. 8 refs., 2 figs., 1 tab.

Installation of the Secure Automated Fabrication (SAF) line has been completed. It is located in the Fuel Cycle Plant (FCP) at the Department of Energy's (DOE) Hanford site near Richland, Washington. The SAF line was designed to fabricate advanced reactor fuel pellets and assemble fuel pins by automated, remote operation. This paper describes powder handling equipment and techniques utilized for automated powder processing and powder conditioning systems in this line. 9 figs.

I have compiled all of the data on isotopic abundance measurements and their variation in nature for the time period since the last General Assembly. Most of the data deals with the variations in the abundances as given by per mil deviations from some standard. As such, they are not of major interest to the Atomic Weights Commission. However, there were some measurements which are of general interest in this list.

A mathematical and numerical model for evaluation of crevice and pitting corrosion in radioactive waste containers is presented. The model considers mass transport, mass transfer at the metal/solution interface, and chemical speciation in the corrosion cavity. The model is compared against experimental data obtained in artificial crevices. Excellent agreement is found between modeled and experimental values. The importance of full consideration of complex ion formation in the aqueous solution is emphasized and illustrated. 10 refs., 5 figs.

An article written by Julie Gilberto for the Fort Worth Star-Telegram about the UNT led North Texas Regional Institute for Educators on the Visual Arts that aids teachers in combining art and regular coursework to better students' education. The piece features a look at students in a classroom where this idea is already being implemented.

To what extent can we understand current low-energy DCX cross sections to the DIAS in terms of the sequential mechanism What do the results have to say about the nuclear wave functions 20 refs., 20 figs.

This paper examines the properties of sequential probability ratio tests (SPRT's) and the application of these tests to nuclear power reactor operation. Recently SPRT's have been applied to delayed-neutron (DN) signal data analysis using actual reactor data from the Experimental Breeder Reactor-II, which is operated by Argonne National Laboratory. The implementation of this research as part of an expert system is described. Mathematical properties of the SPRT are investigated, and theoretical results are validated with tests that use DN-signal data taken from the EBR-II in Idaho. Variations of the basic SPRT and applications to general signal validation are also explored. 16 refs., 3 figs.

The geochemistry surrounding a waste package is likely to be affected by corrosion of portions of the waste package such as the container. The phenomena involved represent a strong interaction or coupling of corrosion and geochemical processes. A generalized model is developed which can describe the electrochemistry developed in corrosion cells and its interaction with the surrounding geochemical environment. The model is first applied to laboratory data on crevice corrosion and then used to perform a parametric study. The results suggest that all components of the waste package, and their potential interactions must be carefully considered in evaluation of the likely geochemical environment for containment and controlled release of radionuclides. Development of geochemical microenvironments with conditions significantly different from the bulk solution appears likely. Electrical contact between metallic solids can locally raise of lower the potential leading to large accelerations or reductions in corrosion rates. 9 refs., 9 figs.