The study of trivalent actinide(An(III))interactions with nitrogen and oxygen donor(N,O-donor)extractants is highly relevant to efforts aimed at closing the nuclear fuel cycle.Despite their importance,extraction of tr...The study of trivalent actinide(An(III))interactions with nitrogen and oxygen donor(N,O-donor)extractants is highly relevant to efforts aimed at closing the nuclear fuel cycle.Despite their importance,extraction of transplutonium actinides remains underexplored.A popular N,O-donor extractant,phenanthroline diamide(DAPhen),has incurred interest for f-element separations due to numerous positive qualities such as molar acid stability,a pre-organized binding mode,and tunable amide functionalities.Solvent extraction experiments of TEtDAPhen in nitrobenzene demonstrated selectivity for multiple An(III)(An=Am,Cm,Bk,Cf)metals over Eu(III).展开更多
Helical axial-flow multiphase pumps are core devices for developing deep-sea oil and gas,but the complex two-phase flow inside such pumps affects their transport stability.As reported here,for enhanced flow characteri...Helical axial-flow multiphase pumps are core devices for developing deep-sea oil and gas,but the complex two-phase flow inside such pumps affects their transport stability.As reported here,for enhanced flow characteristics,splitter blades were added at the noncoincidence area of the impeller tail by using a multi-objective optimization method,and their impact on the pump performance was explored in comparison with the original model.The results indicate that Gaussian process regression combined with particle swarm optimization accurately predicts the pump external characteristics.Under an inlet gas volume fraction of 30%,the optimized model increases the head coefficient by 22.2%without reducing efficiency.Although splitter blades enhance the impeller tail,they intensify gas-phase accumulation at the tail.The optimized model promotes more-uniform two-phase flow in the channels,with the axial velocity uniformity of the gas phase and liquid phase improving by 15.1%and 9.5%and the average velocity angle increasing by 12.3°and 8.3°under an inlet gas volume fraction of 30%.展开更多
基金supported by the U.S.Department of Energy Office of Science,Office of Basic Energy Sciences,and Colorado School of Mines under award number DE-SC0020189(E.M.A.,S.S.G.,J.A.J.,and J.C.S.)We thank the U.S.Department of Energy,Office of Science,Office of Basic Energy Sciences,Heavy Element Chemistry program(2020LANLE372)(J.C.G.,B.L.H.,J.G.K,S.A.K.)+1 种基金the US Department of Energy,National Nuclear Security Association(NNSA),Plutonium Modernization Program(NA-191,B.N.L.)for funding the synthesis and characterization of Am(TEtDAPhen)(NO3)3 complexAdditional support for this effort came from LANL’s LDRD projects(20220054DR)for characterization measurements.
文摘The study of trivalent actinide(An(III))interactions with nitrogen and oxygen donor(N,O-donor)extractants is highly relevant to efforts aimed at closing the nuclear fuel cycle.Despite their importance,extraction of transplutonium actinides remains underexplored.A popular N,O-donor extractant,phenanthroline diamide(DAPhen),has incurred interest for f-element separations due to numerous positive qualities such as molar acid stability,a pre-organized binding mode,and tunable amide functionalities.Solvent extraction experiments of TEtDAPhen in nitrobenzene demonstrated selectivity for multiple An(III)(An=Am,Cm,Bk,Cf)metals over Eu(III).
基金supported by the National Natural Science Foundation of China(Grant Nos.52179086 and 52269022)the Central Government Guides’Local Science and Technology Development Funding Project(Grant No.23ZYQA0320).
文摘Helical axial-flow multiphase pumps are core devices for developing deep-sea oil and gas,but the complex two-phase flow inside such pumps affects their transport stability.As reported here,for enhanced flow characteristics,splitter blades were added at the noncoincidence area of the impeller tail by using a multi-objective optimization method,and their impact on the pump performance was explored in comparison with the original model.The results indicate that Gaussian process regression combined with particle swarm optimization accurately predicts the pump external characteristics.Under an inlet gas volume fraction of 30%,the optimized model increases the head coefficient by 22.2%without reducing efficiency.Although splitter blades enhance the impeller tail,they intensify gas-phase accumulation at the tail.The optimized model promotes more-uniform two-phase flow in the channels,with the axial velocity uniformity of the gas phase and liquid phase improving by 15.1%and 9.5%and the average velocity angle increasing by 12.3°and 8.3°under an inlet gas volume fraction of 30%.
