Different cooling process, annealing temperature and addition of B2O3were experimented on the CaO-MgO-SiO2-Al2O3-Cr2O3-Fe2O3slag system with an aim to investigate the chromium precipitation behaviour. The solidified slags were characterized by XRD, SEM, EDX and EPMA. It was shown that, under melt-quenching process, chromium was immobilized in amorphous structure in the slag with basicity lower than 1.0 and Cr2O3content less than 4.0 wt%. It was also found that addition of B2O3and higher annealing temperature would be helpful for the precipitation of chromium into spinel solid solution in slag with basicity of 1.5.

La0.8Sr0.2MnO3 was prepared to investigate the infrared emissivity of the sample under 0.76-2.5 μm and 2.5-500 μm infrared fields. The sample exhibited characteristic peaks of rhombohedral perovskite structure at 298-318 K, and split of the main peak weakened with increasing temperature. Intensity of the ferromagnetic resonance peak enhanced with increasing temperature, and the peak was shifted toward high magnetic field. A weak paramagnetic resonance peak appeared at 318 K, indicating that ferromagnetic-paramagnetic transition was occurring. The temperature of the sample under 2.5-500 μm field was higher than that under 0.76-2.5 μm. The emissivity of the sample increased with radiation time under 2.5-500 μm, but it had no obvious changes at about 0.665 under 0.76-2.5 μm. The emissivities at the same temperature fields were higher than those under 0.76-2.5 μm and 2.5-500 μm fields, respectively. It suggested that 0.76-2.5 μm and 2.5-500 μm radiations had inhibition effect on emissivity of La0.8Sr0.2MnO3.

Because current image and 3D scanning file processing technologies are difficult to use in comparing cable-cutting toolmarks effectively, an airport cable-cutting toolmark rapid-tracing matching algorithm based on single-point laser sensing is presented. The proposed algorithm applies a boxplot to the linear toolmark signals picked by a laser displacement sensor to perform an abnormal data correction. Then, a rotation angle adaptive correction is performed to unify the matching data. Furthermore, in multimatching strategies based on a threshold sequence, the difference in variance is used to perform the similarity matching of toolmark features. Finally, a correct determination of the corresponding tools is rapidly achieved. The practicality and effectiveness of the proposed algorithm are verified by experiments using actual mark inference cable-cutting tools.