The feasibility of using various uranium-free fuels for plutonium incineration in present light water reactors is investigated. Two major categories of inert matrix fuels are studied: composite ceramic fuel particles dispersed in another ceramic matrix (CERCER) and ceramic fuel particles dispersed into a metallic matrix (CERMET). In the category of CERCER, the current world wide research effort...

Final Report: Novel Optical Fiber Materials With Engineered Brillouin Gain Coefficients SSL-1: NOVEL FIBER LASERS Report Title This 2-year program (with 1 year no-cost extension) sought to investigate novel optical materials suitable for use in high-power narrowlinewidth fiber lasers. A complete model for the mass density, acoustic velocity, acoustic attenuation, photoelastic (Pockels’) coeffic...

Introduction. Nickel-rich spinel is recognized as a cosmic event marker [1-3,5]. Spinel is found in K/T boundary sections all over the world [1-3,14], in lower-middle Jurassic hardground [13], in late Pliocene sediments [4] and in upper Eocene sediments [12]. Its composition is characterized by a high nickel oxide concentration (NiO>1 wt%) and a high iron oxidation state (Fe/Fetot>70 mole%) inv...

available online at http://meteoritics.org 1287 © Meteoritical Society, 2004. Printed in USA. The activity of chromite in multicomponent spinels: Implications for T-fO2 conditions of equilibrated H chondrites Ronit KESSEL,1* John R. BECKETT,1 Gary R. HUSS,2 and Edward M. STOLPER1 1Institute of Earth Sciences, The Hebrew University, Givat-Ra, Jerusalem, 91904, Israel 2Department of Geological Sc...

Introduction: Melilite-free, spinel-, hibonitebearing spherules, a major type of refractory inclusion in CM2 chondrites, consist of phases that are predicted by thermodynamic calculations to condense from a cooling gas of solar composition but are not predicted to coexist with each other. Throughout updates and additions to the data base over the years, calculations [e.g. 1-3] consistently show...

We established a new diode array pumped Er:Yb:Glass test setup for evaluation of the laser performance and q-switch characteristics of various saturable absorber materials at 1.54um. Pumping distribution and maximum gain was analyzed. Passive q-switched laser operation was demonstrated with both U: CaF2 and Co : MgAl2O4. TEMoo Qswitch pulses with energy of 0.5mJ and pulse width of 10ns was obta...

With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compositions of small ( 1 m) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains from Murray separate CF (mean diameter 0.15 m) we discovered 15 presolar spinel and 3 presolar corundum grains, among 753 grains from Murray separate CG (mean diameter 0.45 ...

Magnetic oxides are naturally occurring minerals. In order to understand their unique properties and their utilization in technological applications, one must fully understand the correlation between chemistry, structure, particle size and processing. Among the broad classification of magnetic oxides, the spinel ferrites gain much importance because of their low cost, high magnetic permeability...