Chalk River Laboratories

About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.

Correlation of diffraction peak broadening to crystal strengthening in finite element simulations

Abstract: Trends in the evolution of the distributions of crystal slip system strength and lattice strain were collected from finite element simulations of tensile loading of polycrystals. The loading programmes replicated physical experiments on two metallic alloys (AA5182 aluminum and AL6XN stainless steel) in which Bragg peaks were measured by neutron diffraction. Correlations between the broadening of the Bragg peaks and the evolution of slip system strength are demonstrated.

The influence of curvature on membrane domains.

Abstract: An interdependence between local curvature and domain formation has been observed in both cell and model membranes. An implication of this observation is that domain formation in model membranes may be modulated by membrane curvature. In this paper, small-angle neutron scattering (SANS) is used to examine the influence of membrane curvature (i.e., vesicle size) on the formation of membrane domains. It is found that, although vesicle size and polydispersity are not significantly altered by the formation of membrane domains, the area fraction occupied by domains depends on the overall vesicle size. In particular, increasing membrane curvature (i.e., decreasing vesicle size) results in increased area fractions of membrane domains.

The influence of light and acid on the measurement of ferrous iron in lake water

Abstract: Measurement of ferrous iron in lake water by solvent extraction of the ferrous bathophenanthroline (BPA) complex (Let and Stumm 1960; amended by Shapiro 1966) has yielded rather erratic and nonreproducible results. The variability is attributed to the influence of light and acid on the water sample. Such treatment of a lake water sample before and during analysis significantly increased the yield of ferrous iron, This study was made on water collected from the small, eutrophic Upper Bass Lake, located on the Chalk River Nuclear Laboratories property at Chalk River, Ontario. The surface area is 5.63 hectares and maximum depth is 7.8 m. There are two inlets that collect water from a surrounding terrain of igneous rock and a small permanent outlet, The pH of the water at Z-m depth is approximately 7.0, with a color value (Pt-Co units) of 100. Total iron concentration at this depth, determined by calorimetric analysis with BPA and by flame spectroscopy, is 2.3 mg/liter. There is a sharp thermal stratification in summer at approximately 3 m; during the study (1March to July 1966), dissolved oxygen content at 2 m varied between 6.02 and 4.69 mg/liter, The author gratefully acknowledges the assistance of J. F. MacDonald during the collections and analyses involved with this work. ANALYTICAL TECHNIQUES

Multiparticle states in the S = 1 chain system CsNiCl3.

Abstract: A continuum of magnetic states has been observed by neutron scattering from the spin-1 chain compound CsNiCl3 in its disordered gapped one-dimensional phase. Results using both triple-axis and time-of-flight spectrometers show that around the antiferromagnetic point Qc = pi, the continuum lies higher in energy than the Haldane gapped excitations. At 6 K the integrated intensity of the continuum is about 12(2)% of the total spectral weight. This result is considerably larger than the 1%-3% weight predicted by the nonlinear sigma model for the three-particle continuum.