The two-step vitrification process involves converting high-level waste from a liquid to a solid state through calcination , followed by melting the calcines with glass matrix material to form glassy wasteforms. The calcination process is a critical stage in the vitrification process. This study investigated the thermal decomposition performance and phase evolution of power reactor simulated high-level waste during the calcination process. As the calcination temperature increased from 100 to 900 °C, the resultant waste calcines showed increasingly darker color and smaller general particle sizes. Below 600 °C, the waste experienced thermal decomposition of nitrate and formate compounds, leading to an approximate 40 wt% weight reduction. At 600 °C, the waste's weight remained constant, and crystalline phases such as Zr x M 1-x O 2 (M = Ce, Pr, Nd), BaMoO 4 , CeO 2 , and Gd x Ce 1-x O 2 were observed.
MicroRNAs (miRNAs) are a class of endogenous, non-coding, single-stranded RNA molecules that are typically 20–25 nucleotides in length. The expression levels of miRNAs in blood, tissue, and other samples are characteristically altered in several disease states. The detection of miRNAs represents a promising avenue for the early diagnosis of various diseases. Consequently, there is a clear need to enhance the sensitivity of miRNA detection to facilitate more accurate disease detection. A fluorescent biosensor was developed that utilizes supramolecular host-guest interactions for assembly and Mo-based materials to initiate a reversible addition-fragmentation chain transfer polymerization (RAFT). The scheme functions by modifying the miRNA on Fe 3 O 4 -magnetic nanoparticles (Fe 3 O 4 -MNPs), followed by linking the initiator of the subsequent RAFT reaction through supramolecular host-guest interaction. Ultimately, polymerization reactions initiated by Mo compounds result in the formation of polymers with fluorescent monomers on Fe 3 O 4 -MNPs. The sensor is extremely sensitive and the detection limit of this sensor is 0.03 fM. Furthermore, the protocol has been demonstrated to be highly effective in the detection of samples in serum, which also serves to illustrate the potential of this fluorescent biosensor for the detection of other kinds of miRNAs.
危险品化学品经营许可证（带存储）