scholarly journals Direct comparison of spectroscopic data with cluster calculations of plutonium dioxide and uranium dioxide

2013 ◽  
Vol 31 (1) ◽  
pp. 013001 ◽  
Author(s):  
J. G. Tobin ◽  
S.-W. Yu ◽  
B. W. Chung ◽  
M. V. Ryzhkov ◽  
A. Mirmelstein
Keyword(s):  
Uranium Dioxide ◽  
Spectroscopic Data ◽  
Plutonium Dioxide ◽  
Cluster Calculations

Thermal Transport in Defective Actinide Oxides

2018 ◽  
Author(s):  
Alex Resnick ◽  
Katherine Mitchell ◽  
Jungkyu Park ◽  
Hannah Maier ◽  
Eduardo B. Farfán ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Oxygen Vacancy ◽  
Uranium Dioxide ◽  
Thermal Transport ◽  
Dynamics Simulation ◽  
Nuclear Fuels ◽  
Plutonium Dioxide ◽  
Vacancy Defects ◽  
Actinide Oxides ◽  
Substitutional Defects

The present study employs a molecular dynamics simulation to explore thermal transport in various oxide nuclear fuels with defects such as uranium oxide and plutonium oxide. In particular, the effect of vacancy and substitutional defects on the thermal transport in actinide oxides are investigated. It is found that the thermal conductivities of these oxide nuclear fuels are significantly reduced by the presence of vacancy defects. In spite of their small size, oxygen vacancy is shown to alter the thermal conductivity of oxide fuels greatly; 0.1% oxygen vacancy reduces the thermal conductivity of plutonium dioxide by more than 10% when the number of unit cell in length is 100. It was shown that the missing of larger atoms alters the thermal conductivity of actinide oxides more significantly. For the case of uranium dioxide, 0.1% uranium vacancies decrease the thermal conductivity by 24.6% while the same concentration of oxygen vacancies decreases the thermal conductivity of uranium dioxide by 19.4%. However, the uranium substitutional defects are shown to have a minimal effect on the thermal conductivity of plutonium dioxide because of the small change in the atomic mass.

Pyrochemical reduction of uranium dioxide and plutonium dioxide by lithium metal

2002 ◽  
Vol 300 (1) ◽  
pp. 15-26 ◽  
Author(s):  
T Usami ◽  
M Kurata ◽  
T Inoue ◽  
H.E Sims ◽  
S.A Beetham ◽  
...  
Keyword(s):  
Uranium Dioxide ◽  
Lithium Metal ◽  
Plutonium Dioxide

Models of Cataclysmic Variables from Photometric and Spectroscopic Data

1979 ◽  
Vol 46 ◽  
pp. 65-74 ◽  
Author(s):  
A.C. Fabian ◽  
J.E. Pringle ◽  
J.A.J. Whelan ◽  
J.A. Bailey
Keyword(s):  
Spectroscopic Data ◽  
Cataclysmic Variables ◽  
System Parameters ◽  
Dwarf Nova ◽  
Spectroscopic Observations ◽  
Photometric And Spectroscopic Observations

Abstract.Recent photometric and spectroscopic observations of the dwarf nova system Z Cha are discussed. Methods for constraining the system parameters are applied and the disc emissivity is deduced as a function of radius. Indications are found that the disc shrinks in size with increasing time after outburst.

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