Results 221 to 230 of about 2,225,685 (244)

A theory of swelling and gas release for reactor materials

Journal of Nuclear Materials, 1964
Abstract The physical mechanisms deduced from the direct observation of inert gas bubbles in the electron microscope are used to evolve a model, or theory, for swelling. The model assumes the insolubility of the inert gases and the bodily migration of the gas bubbles, and relies upon the equation of state for the inert gas, upon the surface energy ...
openaire   +1 more source

Re-solution effects and fission gas swelling in UO2

Journal of Nuclear Materials, 1972
Abstract A fission gas swelling model is proposed which enables one to calculate swelling in the vicinity of grain boundary networks and in imperfection-free regions. The grain boundary swelling requires a knowledge of the gas accumulation and the reaction-rate at the boundary. The gas accumulation was calculated by deriving a modified form of Fick's
C.C. Dollins, H. Ocken
openaire   +1 more source

A Statistical Fuel Swelling and Fission Gas Release Model

Nuclear Applications and Technology, 1970
AbstractA computer simulation of a fuel region has been developed based on movement of fission gas bubbles in solids under a thermal gradient. Within this region, fission gas events are followed via a Monte Carlo technique. Individual bubbles are followed through their time history from nucleation to release from the fuel, with interactions at ...
H. R. Warner, F. A. Nichols
openaire   +1 more source

Effect of gas atoms on swelling of austenitic stainless steel

Journal of Nuclear Materials, 1994
Abstract There have been many studies on the effect of He on swelling, however not so many on the effect of nitrogen on swelling. In this study the effect of nitrogen on swelling of 316 steel was investigated under HVEM irradiation for establishing a model of swelling.
N. Igata, N. Eguchi, E. Nishibe, A. Naito   +3 more
openaire   +1 more source

Gas-induced swelling of beryllium implanted with deuterium ions

Journal of Nuclear Materials, 1996
Abstract An extensive TEM study of the microstructure of Be TIP-30 irradiated with 3 and 10 keV D ions up to fluences, Φ, in the range from 3 × 10 20 to 8 × 10 21 D/m 2 at temperatures, T irr = 300, 500 and 700 K has been carried out. Depth distributions of deuterium in a form of separate D atoms and D 2 molecules have been investigated by ...
V.N. Chernikov, V.Kh. Alimov, A.V. Markin, A.E. Gorodetsky, S.L. Kanashenko, A.P. Zakharov, I.B. Kupriyanov   +6 more
openaire   +1 more source

Fission gas release and swelling in UO2 doped with Cr2O3

Journal of Nuclear Materials, 1980
Abstract UO 2 doped with 0.5 wt% Cr 2 O 3 has been irradiated at 1500°C to three differing burn-ups to a maximum of 0.45% FIMA. The gas release and swelling have been compared with a reference fuel and found to be similar. To explain the results it is necessary to assume both an enhanced gas diffusion rate and a reduced grain boundary surface ...
openaire   +1 more source

A theory of the coalescence of gas bubbles under conditions of swelling

Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology, 1965
Abstract In the later stages of decomposition of a supersaturated solid solution, an important role is played by the dissolution of grains of new phase dispersed throughout the solution (coalescence). In the present work the kinetics of this process is investigated for swelling, where the grains of new phase are bubbles containing inert gas.
openaire   +1 more source

New Approach for Simultaneous Measurement of Gas Absorption and Swelling

Industrial & Engineering Chemistry Research, 2011
For sorption measurements many different methods are applicable, but nearly all of them require a correction of the raw experimental data by a factor including the sample’s volume.
Tobias M. Fieback, Frieder Dreisbach
openaire   +1 more source

Complications in investigations of the swelling of hydrogel matrices due to the presence of trapped gas

Journal of Controlled Release, 1998
In recent studies, NMR imaging has been used to investigate the swelling of hydroxypropylmethylcellulose (HPMC) tablets and to determine polymer concentration distributions in the swollen matrix. The total amount of polymer in the system was computed from these distributions and was up to 35% greater than the known weight of HPMC in the tablet.
C A, Fyfe, A I, Blazek
openaire   +2 more sources

Diffusion controlled swelling of reservoir oil by direct contact with injection gas

Chemical Engineering Science, 1991
The diffusion-controlled swelling of reservoir oil, when the oil is indirectly contacted by an injection gas such as CO by diffusion through a water barrier film, is presented. The solutions are based on the method of the variable powered profile to describe the distribution of CO in the oil and water phases.
Do, H. D., Pinczewski, W. V.
openaire   +3 more sources