Uranyl molybdates in fluorites and uranium-carbonate ores from the Strel’tsovskoe ore field of the Argun deposit

Microprobe research was performed on transparent polished plates (thin sections) of samples of fluorite and uranium ore from the Argun deposit in Zabaikal’skii Krai, Russia. The composition of minerals was determined at the Center for Isotopic Study of the Russian Geological Research Institute using a Cam-Scan MX 2500 scanning electron microscope equipped with a Link Pentaflet energy-dispersion spectrometer. Certified natural and synthetic samples were used as the standards.     

Basic Principles of the Hydraulic Theory of Formation and Development of River Channel Mesoforms

A closed system of equations was obtained which describes the formation of river channel mesoforms. The conditions were found which cause recurrent restructuring of the flow velocity field which governs the shape and dimensions of the channel mesoforms. The evolution of the longitudinal profile of a mesoform is considered and the parameters that control this process are evaluated. A numerical solution of the problem of river channel mesoform development is given. An interpretation of the hydraulic theory in terms of energy is given.