Measurement of Strontium Isotopic Ratio in Natural Matrix Sample Containing Strontium-90
Strontium isotopic ratios in a natural matrix reference material (IAEA-A-12) containing strontium-90 were measured by means of a thermal ionization mass spectrometer with a multi-collector system (MC-TIMS). There was significant difference in the measured isotopic ratios between the IAEA-A-12 and a standard reference material of the strontium isotopes (SRM 987), and 88Sr/86Sr and 87Sr/86Sr of the IAEA-A-12 were smaller and 84Sr/86Sr was larger than those of the SRM 987. 90Sr/86Sr ratio was estimated, by calculating the number of atoms of the strontium-90 from its activity, to be 3.55 × 10−10.
In this paper, a modeling and simulation method for planar interdigitated ruthenium oxide MEMS supercapacitor was proposed based on the electrochemical reaction mechanism of supercapacitor. The study simulated the planar interdigitated ruthenium oxide MEMS super capacitor using Comsol software. The highly accurate charge and discharge curves of the super capacitor, electric potential distribution graph and the concentration distribution graph were got through simulation. The effects of two structure-parameters were discussed in the research.