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.

The Effect of Fibre Diameter on the Mechanical Properties of Graphite Fibres Manufactured from Polyacrylonitrile and Rayon

Abstract: A relationship between diameter and both Young's modulus and tensile strength of graphite fibres, manufactured from both polyacrylonitrile and rayon precursors is demonstrated. Thin fibres exhibit higher values of Young's modulus and tensile strength than thick fibres. The observed relationship is deduced to be a consequence of the “sheath” and “core” type structure which is characteristic of these fibres.

Microscopic structure of high-spin vibrational excitations in superdeformed 190,192,194Hg.

Abstract: Microscopic calculations based on the cranked shell model extended by the random-phase-approximation are performed to investigate the quadrupole and octupole correlations for excited superdeformed bands in $^{190}\mathrm{Hg}$, $^{192}\mathrm{Hg}$, and $^{194}\mathrm{Hg}$ The K=2 octupole vibrations are predicted to be the lowest excitation modes at zero rotational frequency At finite frequency, however, the interplay between rotation and vibrations produces different effects depending on neutron number: The lowest octupole phonon is rotationally aligned in $^{190}\mathrm{Hg}$, is crossed by the aligned two-quasiparticle bands in $^{192}\mathrm{Hg}$, and retains the K=2 octupole vibrational character up to the highest frequency in $^{194}\mathrm{Hg}$ The \ensuremath{\gamma} vibrations are predicted to be higher in energy and less collective than the octupole vibrations From a comparison with the experimental dynamic moments of inertia, a new interpretation of the observed excited bands invoking the K=2 octupole vibrations is proposed, which suggests those octupole vibrations may be prevalent in superdeformed Hg nuclei \textcopyright{} 1996 The American Physical Society

Defective DNA repair and increased lethality in ataxia telangiectasia cells exposed to 4-nitroquinoline-1-oxide

Abstract: Ataxia telangiectasia (AT) is a rare autosomal recessive disorder in man characterized by progressive loss of muscular coordination (due to neurodegeneration) and permanent dilation of the small blood vessels of the eyes and skin1,2. AT patients also have repeated sinopulmonary infections, immune defects associated with thymus underdevelopment, and abnormal endocrine functions1,2. Affected patients are at high risk of developing malignancy, particularly lymphomas and lymphatic leukaemias1, and there are clinical indications3–5 that AT patients are hypersensitive to conventional radiotherapy administered for treatment of malignancy. Cultured diploid fibroblasts from AT donors are consistently hypersensitive to ionizing radiation2,6,7, apparently due to defective enzymatic repair of radiogenic DNA damage2,8. We have determined the survival responses and DNA repair abilities of AT cells exposed to 4-nitroquinoline-1-oxide (4NQO), a chemical carcinogen whose DNA-damaging properties partially mimic those of ionizing radiation9. We report here that certain AT cell strains show hypersensitivity to inactivation by 4NQO and defective repair of 4NQO-induced adducts in DNA.