Institution
Atomic Energy of Canada Limited
Company•Ottawa, Ontario, Canada•
About: Atomic Energy of Canada Limited is a company organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Zirconium alloy & Neutron. The organization has 4845 authors who have published 4826 publications receiving 102951 citations.
Topics: Zirconium alloy, Neutron, Zirconium, Hydrogen, Neutron scattering
Papers published on a yearly basis
Papers
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TL;DR: In this paper, carbon cages were built from sp2 carbon atoms, which protected the encapsulated nanoparticles from both oxidation and agglomeration, and the resulting products were ferromagnetic, with maximum values of coercivity field of 600?G?s, and saturation magnetization values of up to 40?emu?g?1.
Abstract: Fe, Fe3C and NdC2 nanoparticles, encapsulated within carbon cages, were continuously produced during the induction thermal plasma processing of Fe14Nd2B, in the presence of methane or acetylene. The product morphology was studied by means of SEM. Further structural details were obtained from TEM, HRTEM, Raman spectroscopy and x-ray powder diffraction studies. The so-produced nanostructures have core?shell structure, with inner cavity diameters varying between 10 and 30?nm. The carbon coatings were composed of between 5 and 25 graphene layers. The carbon cages were built from sp2 carbon atoms, which protected the encapsulated nanoparticles from both oxidation and agglomeration. The plasma generated products were ferromagnetic, with maximum values of coercivity field of 600?G?s, and saturation magnetization values of up to 40?emu?g?1.
45 citations
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TL;DR: The results of a series of tests describing the vibration behavior of several rotated triangular tube bundles subjected to two-phase cross flows are presented in this paper, where tube bundles with a pitch-to-diameter ratio of approximately 1.5 were tested over a broad range of void fractions and mass fluxes.
Abstract: The results of a series of tests describing the vibration behavior of several rotated triangular tube bundles subjected to two-phase cross flows are presented. Tube bundles with a pitch-to-diameter ratio of approximately 1.5 were tested over a broad range of void fractions and mass fluxes. Fluidelastic instability, random turbulence excitation, hydrodynamic mass, two-phase damping and local void-fraction were investigated. Well-defined fluidelastic instabilities were observed in continuous two-phase flow regimes. However, intermittent two-phase flow regimes had a dramatic effect on fluidelastic instability lead-ing to lower than expected threshold flow velocities for instability, This effect was more pronounced in Freon two-phase flow than in air-water, and appeared well correlated to the transition between continuous and intermittent flow regimes. Generally, random turbulence excitation forces were much lower in Freon than in air-water. Although very dependent on void fraction, as expected, damping was quite similar in air-water and Freon.
45 citations
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TL;DR: In this article, the steady-state thermal creep rate in the axial and transverse directions of Zr-2.5Nb of pressure tubes, used in CANDU nuclear reactors, was determined.
Abstract: The steady-state thermal creep rate in the axial and transverse directions of Zr-2.5Nb of pressure tubes, used in CANDU nuclear reactors, was determined. The data were obtained both from tensile samples having their tensile axes cut along the axial and transverse directions of the pressure tubes and from small-sized, thin-walled tubes, i.e., “mini” tubes stressed either in torsion or by internally pressurizing capsules manufactured from the mini tubes, or by additionally applying an external, axial load on these internally pressurized capsules. The temperature range of the data was from 373 to 596 K (100 °C to 323 °C) and the duration of the tests was from about 1500 hours to over 12,000 hours. The tests were carried out over a sufficiently long time for the creep rate to be measurable in the steady-state creep regime. It was found that the steady-state creep rate depends on stress in a nonlinear fashion and the stress exponent over the entire temperature range was about four. This value is consistent with the values measured earlier on other zirconium alloys. The activation energy Q was found to be about 21 and 10 kcal/mol for temperatures above and below 475 K (∼ 200 °C), respectively. These values are lower than those measured by other investigators on the same material at higher temperatures but similar to values found on other Zr alloys at low temperatures. It appears that Q is dependent on temperature and its value is consistent with the presence of dynamic strain aging (DSA). The results of this study were analyzed with a polycrystalline, nonlinear self-consistent model that take into account the crystallographic texture of the material. This model was used to derive the values of critical resolved shear stress (CRSS), which are consistent with prismatic, basal, and pyramidal glide. By using these values and the apparent temperature dependence of Q, it was shown that this model predicts well the steady-state creep rate over the entire temperature range and under very different stress states.
45 citations
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TL;DR: In this article, the static fatigue limit is determined by measuring the change in strength distribution of a representative sample after a high-temperature anneal under a fixed tensile stress.
Abstract: After a review of the literature on the static fatigue limit, it was concluded that the normal method for its determination, using time-to-rupture data, is inadequate. There are very few experimental demonstrations of the existence of a true fatigue limit, and it is difficult to measure its value with any statistical confidence. An alternative experimental approach is suggested which is based on measuring the change in strength distribution of a representative sample after a high-temperature anneal under a fixed tensile stress. This stress weakens weak specimens in the as-received distribution, whereas strong specimens gain in strength. Those specimens whose strength remains constant demonstrate the existence of a fatigue limit and can be used to calculate a numerical value. The results are analyzed on the basis of the Charles-Hillig stress corrosion theory, which has been slightly modified to facilitate the examination of the parameters associated with the fatigue limit. This analysis relates the static fatigue limit to the effective surface energy appropriate to the fatigue mechanism, i.e. corrosion caused by water vapor. Some implications of the modified model are discussed.
45 citations
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TL;DR: In this paper, a review outlines progress in the development of SEM electron channelling pattern techniques since Coates first observed patterns and Bookeret et al. explained their origin ten years ago.
Abstract: This review outlines progress in the development of SEM electron channelling pattern techniques since Coates first observed patterns and Bookeret al. explained their origin ten years ago. Discussions are included on the mechanism of electron channelling in crystals, electron optical and specimen conditions for generating patterns, pattern indexing, selected-area analysis, and applications. Progress in revealing crystal defects is also discussed.
45 citations
Authors
Showing all 4845 results
Name | H-index | Papers | Citations |
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Henry P. Schwarcz | 78 | 351 | 20863 |
Jonathan N. Glickman | 72 | 172 | 24025 |
Andrej Atrens | 69 | 417 | 21741 |
See Leang Chin | 67 | 460 | 17181 |
Purnendu K. Dasgupta | 62 | 506 | 16779 |
John Katsaras | 55 | 220 | 9263 |
Jing-Li Luo | 55 | 436 | 10963 |
Charles Gale | 53 | 331 | 10903 |
Sanjoy Banerjee | 52 | 229 | 8880 |
Yoshio Takahashi | 50 | 403 | 9801 |
Peter Sigmund | 49 | 220 | 11795 |
Michael P. Païdoussis | 46 | 165 | 8825 |
Wei-Kan Chu | 46 | 445 | 8616 |
A. G. W. Cameron | 45 | 123 | 10111 |
Erland M. Schulson | 44 | 245 | 6966 |