Crystalline matrices for immobilization of actinides: Corrosion resistance in water     

S. V. Yudintsev  E. V. Aleksandrova  T. S. Livshits  V. I. Mal’kovskii  Ya. V. Bychkova  B. R. Tagirov 《Doklady Earth Sciences》2014,458(2):1281-1284

The rate of leaching of actinide-simulating rare-earth elements from two types of crystalline matrices consisting of titanate and titanozirconate phases was examined. The experiments were carried out at 95°C in distilled water. The rates of REE leaching from the samples were below 10^?3 g/m² day, which satisfied the requirements for the characteristics of matrices for immobilization of actinides. After passing the treated solutions through filters of 450 to 25 nm pore sizes, the REE content was changed slightly or not at all. This fact points to the minor role or to the absence of the colloidal form of REE in the solutions after the experiments.  相似文献   

Estimation of drift limits for different seismic damage states of RC frame staging in elevated water tanks using Park and Ang damage index     

Lakhade  Suraj O.  Kumar  Ratnesh  Jaiswal  O. R. 《地震工程与工程振动(英文版)》2020,19(1):161-177

Damage to elevated water tanks in past earthquakes can be attributed to the poor performance of their supporting frame staging. In order to ascertain the performance of these elevated water tanks, it is crucial to categorize the damage in quantifiable damage states. Among various parameters to quantify the damage states, the top drift of frame staging can be conveniently correlated to the different damage levels. In literature, drift limits corresponding to different damage states of the frame staging of the elevated water tank are not available. In the present study, drift limits for RC frame staging in elevated water tanks corresponding to different seismic damage states have been proposed. Various damage states of the elevated water tank have been determined using the Park and Ang damage index. The Park and Ang damage index utilizes results of both pushover analysis and incremental dynamic analysis. Twelve models of elevated water tanks have been developed considering variation in staging height and tank capacity. Incremental dynamic analysis has been performed using the suite of twelve actual earthquake ground motions. Based on the regression analysis between damage indexes and drift, limiting drift values for each damage state are proposed.  相似文献