Calculation of precision in isotope dilution experiments.
Abstract Equations are derived for the composite error of isotope dilution measurements in three types of experiment viz. simple dilution, saturation analysis (sub-stoichiometric dilution) and adsorbed ion measurement; the latter two yielding equations of the same form. Errors for each type are derived in terms of radiometric errors, chemical errors and a factor related to the extent of isotope dilution. In general, dilution is the most critical factor which controls error; chemical errors are usually less important than radiometric errors. A nomogram for calculating dilution errors is given.
Cinétiques de transfert des ions phosphate du sol vers la solution du sol : paramètres caractéristiques
La nutrition phosphatee des plantes dans un sol peut dependre de la vitesse de renouvellement des ions phosphate de la solution du sol par des ions de la phase solide. Mais il n'existait pas jusqu'alors de methode permettant de determiner ces vitesses de transfert (...)
Predictive Interpolation for Registration
Predictive interpolation is a new registration method that uses the bilinear interpolation equation to predict the pixel values of one image from those in another. The method requires that the images already be registered to the nearest pixel, which is not a serious limitation since hierarchical methods may be used to perform the initial registration. Registration accuracy of better than 5% of the width of a pixel can be expected between pairs of images, and this may be improved significantly if multiple images are to be registered to one another.