Issue 10 Volume 41 May 16, 2003

intensity ratios of forbidden lines in astrophysical spectra and compared with theoretical data. The lifetimes and branching
ratios are combined to derive absolute transition probabilities, A-values. We present the first experimental lifetime values for
the two Fe II levels a(sup 4)G(sub 9/2) and b(sup 2)H(sub 11/2) and A-values for 13 forbidden transitions from a(sup 6)S(sub
5/2), a(sup 4)G(sub 9/2) and b(sup 4)D(sub 7/2) in the optical region. A discrepancy between the measured and calculated
values of the lifetime for the b(sup 2)H(sub 11/2) level is discussed in terms of level mixing. We have used the code CIV3
to calculate transition probabilities of the a(sup 6)D-a(sup 6)S transitions. We have also studied observational branching ratios
for lines from 5 other metastable Fe II levels and compared them to calculated values. A consistency in the deviation between
calibrated observational intensity ratios and theoretical branching ratios for lines in a wider wavelength region supports the
use of [Fe II] lines for determination of reddening.
Author
Astrophysics; Experimentation; Iron; Forbidden Transitions; Metastable State; Stellar Spectra
20030033831 Naval Undersea Warfare Center, Newport, RI
A Method for Estimating the Mechanical Properties of a Solid Material Subjected to Insonification - Part 1: Theory
Hull, Andrew J.; Dec 2002; 38 pp.; In English; Original contains color illustrations
Report No.(s): AD-A410618; NUWC-NPT-TR-11404; No Copyright; Avail: CASI; A03, Hardcopy
A theoretical inverse method is develop to measure the complex, frequency deponent dilatational and shear wavespeeds
that are present in isotropic thick plates. Once this wavespeeds are identified, the complex, frequency dependent Young’s and
shear moduli and complex, frequency-dependent Poisson’s ratio can he estimated. Simulations are presented both with and
without noise to show how the method works and how the measurement error affect the analysis results.
DTIC
Mechanical Properties; Slabs; Structural Members
20030033952 Lawrence Livermore National Lab., Livermore, CA
Microstructural Evolution in the 2219 Aluminum During Sever Plastic Deformation
Kaibyshev, R. O.; Safarov, I. M.; Lesuer, D. R.; Mar. 29, 2000; 12 pp.; In English
Report No.(s): DE2002-792652; No Copyright; Avail: Department of Energy Information Bridge
The objective of the present work is to examine the microstructure evolution during severe plastic deformation of a 2219
aluminum alloy. Specific attention is given to the mechanism of ultrafine grain formation as a result of severe plastic
deformation.
NTIS
Aluminum; Aluminum Alloys; Microstructure; Plastic Deformation
20030033953 Air Force Research Lab., Edwards AFB, CA, USA
ALCAN Viewgraph
Huff, Rob; Apr 2002; 3 pp.; In English
Contract(s)/Grant(s): F04611-02-C-0001; Proj-4847
Report No.(s): AD-A410665; AFRL/PRS-ED-VG-2002-072; No Copyright; Avail: CASI; A01, Hardcopy
The Advanced Lightweight Chamber and Nozzle (ALCAN) program is focused on achieving IHPRPT Phase 2 goals for
25 percent reduced cost, 60 percent increased thrust/weight, and up to 15 percent improved performance of the current state
of the art in rocket engines. The overwrapped formed platelet inner chamber will reduce parts count and improve chamber
cooling and life. Channel wall technology and advanced materials used in the nozzle will contribute to major reductions in
weight, and altitude-compensating technology will increase mission average performance. (1 viewgraph)
DTIC
Rocket Engines; Exhaust Nozzles; Walls; Technology Utilization; Combustion Chambers
20030036910 Westinghouse Savannah River Co., Aiken, SC
Characterization of Corrosion Damage on Aluminum Fuel Assemblies in Basin Storage
Andes, T. C.; Large, W. S.; Castle, T. B.; Louthan, M. R.; Valdes, V. S.; 2002; 14 pp.; In English
Report No.(s): DE2002-801711; WSRC-MS-2002-00732; No Copyright; Avail: Department of Energy Information Bridge
49