UNT Libraries Government Documents Department - 150 Matching Results

Search Results

prev Results: 145 - 150
open access

Ultrasonic detection of laminar-type defects in iridium alloy blanks

Description: Encapsulated isotopic heat sources for use in generating electrical power for space applications require flight-quality hardware material. Iridium is the chosen material for such applications, and Oak Ridge National Laboratory has been the prime supplier of iridium alloy forming blanks 52 mm in diameter by 0.66 mm thick (1.0 by 0.026 in.). Prior to the work reported here, these blanks were ultrasonically examined by using 0.9-mm-diam (0.035-in.) simulated flaw standards. However, as a result of… more
Date: July 1, 1986
Creator: Cook, K. V.; Cunningham, Jr., R. A.; Simpson, W. A., Jr. & McClung, R. W.
Item Type: Refine your search to only Report
open access

User's manual for FENAT: a two-dimensional multigroup diffusion theory Finite Element Neutral Atom Transport code

Description: FENAT solves the two-dimensional energy dependent diffusion equation in Cartesian (X-Y) and cylindrical/toroidal (R-Z) coordinates. The boundary conditions allowed are: vacuum, reflection, albedo and surface source. The energy variable is treated by multigroup method. The resulting multigroup diffusion equation is solved by finite element Galerkin's method with triangular element discretization of the spatial domain. The algebraic matrix equation is solved by the direct method of Crout variatio… more
Date: July 1, 1986
Creator: Hasan, M.Z.
Item Type: Refine your search to only Report
open access

Using nonradial pulsations to determine the envelope composition of very evolved stars

Description: Recent observational and theoretical studies of the ZZ Ceti variables (DA degenerate dwarfs), the DBV variables (DB degenerate dwarfs), and the GW Vir variables (DO degenerate dwarfs) have shown them to be pulsating in nonradial g/sup +/-modes. The pulsation mechanism has been identified for each class of variable star and, in all cases, involves predictions of the stars envelope composition. The ZZ Ceti variables must have pure hydrogen surface layers, the DBV stars must have pure helium surfa… more
Date: July 7, 1986
Creator: Starrfield, S.
Item Type: Refine your search to only Article
open access

Weldon Spring historical dose estimate

Description: This study was conducted to determine the estimated radiation doses that individuals in five nearby population groups and the general population in the surrounding area may have received as a consequence of activities at a uranium processing plant in Weldon Spring, Missouri. The study is retrospective and encompasses plant operations (1957-1966), cleanup (1967-1969), and maintenance (1969-1982). The dose estimates for members of the nearby population groups are as follows. Of the three periods … more
Date: July 1, 1986
Creator: Meshkov, N.; Benioff, P.; Wang, J. & Yuan, Y.
Item Type: Refine your search to only Report
open access

D* width and the study of F and F*

Description: Recent results on the D*, F, and F* production in e+e- from HRS and MARK III are summarized. An improved upper limit on the decay width of D* is reported. A brief review of the characteristics of F and the updated data of the F production in e/sup +/e/sup -/ are given. A new measurement on F* is made using the associated production method in the reaction e/sup +/e/sup -/ ..-->.. FF*.
Date: July 1, 1986
Creator: Sugano, K.
Item Type: Refine your search to only Article
Back to Top of Screen