Atomic Energy of Canada Limited

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.

On the surface instability of a highly elastic half-space

Abstract: The phenomenon of surface instability of an isotropic half-space under biaxial plane stress is studied for compressible elastic materials in finite strain. Euler's method is used to derive the general form of the stability criterion, and analytical details are exhibited by special application to the class of hyperelastic Hadamard materials in two complementary cases: (i) the full solution is derived for the compressible, neo-Hookean members, and (ii) the plane deformation solution is provided for every isotropic, elastic material and specific results are presented for the full Hadamard class. Results appropriate to incompressible Mooney-Rivlin materials are herein obtained as special limit cases. Several theorems are established and some of the conclusions are illustrated graphically.

Orientational ordering and the low temperature structure of SF6

Abstract: The crystal structure of sulphur hexafluoride in its low temperature phase has been solved from neutron powder diffraction measurements. At both 23 K and 85 K the structure is triclinic, space group P1, with Z = 3. It is in good agreement with the structure predicted previously by molecular dynamics simulations. No evidence was found for the existence of an hexagonal phase. The phase transition is interpreted in terms of two separate lattice distortions from the cubic, high temperature phase which couple to different stages of orientational ordering. The mechanism driving the transition is the resolution of orientational frustration as the temperature is reduced. The present results confirm the validity of the simple intermolecular force model employed in the simulations for SF6 and they have been used to improve the parameters of this model.

Reactive cross section as a function of reagent energy. II. H(D)+HBr(DBr)→H2(HD,D2)+Br

Abstract: A crossed molecular beam study has been made of reactive cross section as a function of collision energy Sr(ET) for all isotopic variants of the abstraction reaction H′+H″Br→H′H″+Br The apparatus incorporates, for reagent preparation, a supersonic source of variable‐energy H or D atoms, and, for product detection, a tunable vacuum ultraviolet laser to obtain laser‐induced fluorescence of Br The cross‐section functions indicate that the threshold energy for reaction is <1 kcal/mol At enhanced collision energy of ET = 7 kcal/mol, the observed order of reactivity in the isotopic series designated (H′,H′′) was (D,H)≳(D,D)≳(H,H)≳(H,D) As noted in a previous report from this laboratory [Int J Chem Kinet, Laidler Festschrift (in press)] the favorable kinematics for (D,H) as compared with (H,D) can be understood in terms of lengthened interaction time for D atom reaction (compared with H) and diminution in the time required for HBr (compared with DBr) to rotate into the preferred alignment for reaction T

Seismic Rehabilitation of Reinforced Concrete Beam‐Column Connections

Abstract: As building codes are updated, some of the existing important structures may fall short of complying with current standards even though they may have been properly designed and constructed according to earlier codes. Many existing structures may be inadequate and may pose severe risk during seismic events. Rehabilitation measures to upgrade the capacity of these structures can be performed at some point in their useful lives especially when located in seismically active zones. A new method for improving the seismic performance of existing reinforced concrete structures is by jacketing the deficient connections using corrugated steel jackets. An experimental program was conducted to evaluate this method of rehabilitation. Corrugated steel jacketing addresses the particular weakness that is often found in existing reinforced concrete structures, namely the lack of sufficient shear reinforcement and the required confining reinforcement within the joints and in adjoining beams and columns. The perfor...

Corrosion behavior of alloy 316L stainless steel after exposure to supercritical water at 500 °C for 20,000 h

Abstract: Oxidation behavior of alloy 316L stainless steel static capsules were investigated by long-term exposure to the supercritical water at 500 °C and 25 MPa for various exposure times. It was found that the thickness and weight gain vs. exposure time followed parabolic law. Elemental and phase analyses indicated that long-term exposure to the SCW resulted in formation of scales identified as Fe3O4 (outer layer), Mn-Fe-Ni-Cr spinel (inner layer) on the substrate, and Ni-enrichment (chrome depleted region) in the alloy 316L. Oxidation phenomena and scales grown on the Alloy 316L as the result of long term exposure to the supercritical water was discussed.