X-ray vision.
Recent correspondence initiated by Dr. Cochrane Shanks' account of the sensation of light experienced during a CAT scan recalls an article on vision by X rays by R. R. Newell (1948).
Place of new contrast media in renal failure.
It was with great interest that I read “The effect of osmotic diuresis on urinary iodine concentration” (Webb et al., 1978) in your February issue. I believe some observations from our recent experiments and calculations may be of interest and cast some additional light on the place of contrast media of reduced osmolality in advanced renal failure.
Monte Carlo simulations of magnetovolume instabilities in anti-Invar systems
We perform constant pressure Monte Carlo simulations of a spin-analogous model which describes coupled spatial and magnetic degrees of freedom on an fcc lattice. Our calculations qualitatively reproduce magnetovolume effects observed in some rare earth manganese compounds, especially in the anti-Invar material YMn2. These are a sudden collapse of the magnetic moment which is connected with a huge volume change, and a largely enhanced thermal expansion coefficient.