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TMVOC, A Numerical Simulator for Three-Phase Non-isothermal Flowsof Multicomponent Hydrocarbon Mixtures in Variably SaturatedHeterogeneous Media

Description: TMVOC is designed for studying subsurface contamination by volatile organic compounds (VOCs), such as hydrocarbon fuels and industrial solvents. It can model the one-, two-, or three-dimensional migration of non-aqueous phase liquids (NAPLs) through the unsaturated and saturated zones, the formation of an oil lens on the water table, the dissolution and subsequent transport of VOCs in groundwater, as well as the vaporization and migration of VOCs in the interstitial air of the unsaturated zone, and the reversible sorption of VOCs on the rock matrix of a porous medium. TMVOC accounts for differences in aqueous solubility and volatility of different VOCs that may be present in a NAPL. Thermal remediation treatments such as steam injection or electric resistance heating and associated phase change and flow effects can also be modeled. A simple half-life model for biodegradation is included as well.
Date: August 20, 2005
Creator: Pruess, Karsten & Battistelli, Alfredo
Partner: UNT Libraries Government Documents Department

New isotope 264Sg and decay properties of 262-264Sg

Description: New isotope, 264Sg, was identified using the38U(30Si,xn)268-xSg reaction and excitation functions for 262-264Sg weremeasured. 264Sg decays by spontaneous fission with a half life of 37+27/-11 ms. The spontaneous fission branch for 0.9-s 263Sg was measuredfor the first time and found to be (13+-8) percent. 262Sg decays byspontaneous fission with a 15 +5/-3 ms half-life. Spontaneous fissionpartial half-life systematics are evaluated for even-even Sg isotopesfrom 258Sg through 266Sg, spanning the transition region between theN=152, Z=100 and N=162, Z=108 deformed shells.
Date: June 20, 2006
Creator: Gregorich, K.E.; Gates, J.M.; Duellmann, Ch.E.; Sudowe, R.; Nelson, S.L.; Garcia, M.A. et al.
Partner: UNT Libraries Government Documents Department

THE FIRST ISOLATION OF AMERICIUM IN THE FORM OF PURE COMPOUNDS - THE SPECIFIC ALPHA-ACTIVITY AND HALF-LIFE OF Am241

Description: The microgram scale isolation and preparation of pure compounds of americium is described. Data are presented to show that the alpha-half-life of the isotope Am{sup 241} is 490 {+-} 14 years. The absorption spectrum of Am(III) in 1M nitric acid in the range 3500-8000 mu is given. The wave lengths of 10 of the most prominent lines in the copper spark emission spectrum of americium are given to the nearest 0.01 {angstrom}. Evidence is presented to show that the potential for the Am(III)-Am(IV) couple in acid solution is more negative than -2v and that the potential for the Am(II)-Am(III) couple is more positive than +0.9v.
Date: July 20, 1950
Creator: Cunningham, B.B. & Asprey, L.B.
Partner: UNT Libraries Government Documents Department

DATA FOR ELEMENTARY-PARTICLE PHYSICS

Description: S>Tables of elementary-particle data in easily accessible form are presented for researchers in highenergy physics. Included are: The Masses used Mean Lives of the Elementary Particles; Atomic and Nuclear Properties of Materials; Particle Scattering; atomic and Nuclear Constants; and Particle Decay and Reaction Dynamics. (T.R.H.)
Date: March 20, 1958
Creator: Barkas, W.H. & Rosenfeld, A.H.
Partner: UNT Libraries Government Documents Department