Оптимизация режима пуска приводного механизма по критерию среднеквадратического отклонения ускорений

Наведено спосіб зменшення коливань елементів стрічкових ківшових елеваторів під час перехідних процесів шляхом оптимізації режиму пуску приводного механізму за критерієм середньоквадратичного відхилення прискорень.The way of the belt bucket elevators elements oscillations reduction, during transients by means of the driving mechanism start-up mode optimization by a root-mean-square deviation of acceleration criterion has been resulted.Приведен способ уменьшения колебаний элементов ленточных ковшовых элеваторов во время переходных процессов путем оптимизации режима пуска приводного механизма по критерию среднеквадратичного отклонения ускорений

Cesium and Strontium Specific Exchangers for Nuclear Waste Effluent Remediation

During the past 50 years, nuclear defense activities have produced large quantities of nuclear waste that now require safe and permanent disposal. The general procedure to be implemented involves the removal of cesium and strontium from the waste solutions for disposal in permanently vitrified media. This requires highly selective sorbents or ion exchangers. Further, at the high radiation doses present in the solution, organic exchangers or sequestrants are likely to decompose over time. Inorganic ion exchangers are resistant to radiation damage and can exhibit remarkably high selectivities. We have synthesized three families of tunnel-type ion exchangers. The crystal structures of these compounds as well as their protonated phases, coupled with ion exchange titrations, were determined and this information was used to develop an understanding of their ion exchange behavior. The ion exchange selectivities of these phases could be regulated by isomorphous replacement of the framework metals by larger or smaller radius metals. In the realm of layered compounds, we prepared alumina, silica, and zirconia pillared clays and sodium micas. The pillared clays yielded very high Kd values for Cs+ and were very effective in removing Cs+ from groundwaters. The sodium micas also had a high affinity for Cs+ but an even greater attraction for S42+. They also possess the property of trapping these ions permanently as the layers slowly decrease their interlayer distance as loading occurs. Sodium nonatitanate exhibited extremely high Kd values for Sr2+ in alkaline tank wastes and should be considered for removal of Sr2+ in such cases. For tank wastes containing complexing agents, we have found that adding Ca2+ to the solution releases the complexed Sr2+ which may then be removed with the CST exchanger

Development of inorganic ion exchangers for nuclear waste remediation. 1998 annual progress report

'To expand the authors efforts to provide families of inorganic ion exchangers useful on a global scale. In carrying out this objective, they will synthesize a variety of ion exchange materials, determine their structures and where necessary alter these structures to build in the desired properties. The underlying thermodynamic, kinetic and molecular basis of ion exchange behavior will be elucidated and their suitability for nuclear waste remediation will be assessed. As of September 1, 1996, they have synthesized a number of highly selective inorganic ion exchangers, determined their crystal structures and elucidated the mechanism of exchange for a number of these exchangers.