All the samples (except for silt fractions) show a very characteristic triplet of well-defined, intense, and nearly overlapping peaks at 1990, 1870 (the highest intensity), and 1780 cm–1. Deconvolution shows that these peaks are mainly unimodal; for slow scan-modes, each peak in this ...
All the welding samples from FCAW has a similar chemical structure as the MMA welds, as they have all the major peaks for vibrations due to iron oxide, chromates, dichromates, chromium trioxide, silicon dioxide and manganese oxide. Small differences lie in the peak around 520 cm−1 which...
These FTIR indices include normalized carbonyl (C=O) absorption peak area (A1700), normalized sulfoxide (S=O) absorption peak area (A1030), carbonyl index (CI) and sulfoxide index (SI) based on five different reference groups. The rolling thin film oven test (RTFOT) was applied to ...
The absorption peak area of minerals reaches a maximum of 10.28 (about 10 times of that for the raw coal) under the concentration of 700 g/m. The main mineral components vary before and after the CDE. The main mineral components in the raw coal are quartz and kaolinite, while the main ...
The ν2/ν3 and ν4/ν3 ratios were multiplied by 1000 for convenience in creating grinding curve plots. In the case of samples including both calcite and aragonite, we calculated heights using the "Peak height tool" in OMNIC. 3. Results and Discussion 3.1. FTIR Grinding Curves Figure 2 ...
For each PIXE spectrum, the background was fitted to a SNIP algorithm. The peak tail and the full width at half maximum (FWHM) of the Mn Kα-line (5.9 keV) were considered as free parameters. The GeoPIXE software furnished the elemental mass concentration and the corresponding peak areas ...