The dissolution rate and solubility of NaBiO3 have been investigated in nitric acid systems ranging from 4 to 6 M HNO3 and were found to be 58–76 μg/cm2·d and 490–830 mM, respectively. The presence of 50 mM U(VI) drastically increased the solubility to 540–1200 mM, while rates of dissolution were relatively unchanged. The solubility of NaBiO3 increased with an increase in U(VI) concentrations at 4 M HNO3, with log–log analysis indicating a one-to-one complex between Bi and U and infrared spectroscopic evidence monitoring uranyl stretching, suggesting complex formation. Absorbance spectra were obtained experimentally and computationally with an absorbance band in the range of 450–600 nm that has been attributed to Bi(V). The ingrowth and decay of Bi(V) in solution was also studied as a function of mass of solid NaBiO3 present, acidity, and temperature. The activation energies of dissolution and decomposition were calculated to be 39 ± 4 and 61 ± 6 kJ/mol, respectively. These results indicate that dissolution of NaBiO3 into the respective Na+ and BiO3 –occurs prior to undergoing reduction, a process which conventionally has been believed to occur in the reverse order.
A family of asteroids, the Apollos, have orbits which cross that of the earth. Most of these bodies are small and have low reflectivity, making detection difficult. A telescope of modest size equipped with a charge-coupled device (CCD) can be used to search for these objects, which will inevitably sirike the earth. The destructive power of a small Apollo asteroid, 200m in diameter, would be on the order of 1 gigaton causing severe global damage. It is important to find and track these objects so that their numbers and orbits may be accurately determined.The discovery process is typically done by human comparison of time skewed images. Two photographic plates are aligned by hand on a blink comparator, which animates the images by alternating light sources. Once a moving object has been found, its celestial coordinates on each image are calculated. This process is repeated with other images to determine an orbit. These orbital elements are then compared with the elements of known objects which exist in machine readable form.This paper examines algorithms stated in Air Force Image Algebra which facilitate automation of this process, and discusses issues relative to conducting a fast search for such objects. These techniques are also appropriate for detection of comets or any moving extraterrestrial body.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.