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In order to reveal the mechanism of acid-heat coupling in improving the permeability of coal seams, combined with the advantages of the low-temperature nitrogen adsorption method and mercury intrusion method under different pore size tests, X-ray diffraction(XRD) phase analysis was used as an auxiliary method to analyze the microscopic and multi-dimensional angle analysis of coal pore structure. The research results show that the coupling conditions of acid and heat have a significant effect on the pore structure of the coal body, and it shows a trend of first strengthening and then weakening with the increase of temperature. At 50 ℃, the 5% HF+5% HCl mixed acid solution has the most significant effect on pore reformation. Specifically, in the micro-pore stage(measured by the low-temperature nitrogen adsorption method), the pore volume increased by 22.3%, the specific surface area increased by 23.9%, and the average pore size increased by 57.1%. The pore volume increased by 110.2% in the visible crack stage(measured by the mercury intrusion method).

For exploring novel natural product-derived herbicides, 16 novel α-campholenic aldehyde-based 4-methyl-1,2,4-triazole-thioether compounds were designed, synthesized, and characterized by FT-IR, 1H NMR, 13C NMR, ESI-MS and elemental analysis. The preliminary bioassay showed that, at 100 µg/mL, most of the target compounds displayed significant inhibition activity against root-growth of rape(Brassica campestris L.), with inhibition rates of 85.0%～98.2%(A-class activity level), much better than that of the positive control flumioxazin. In addition, an effective and reasonable 3D-QSAR model was established by CoMFA method in SYBYL-X 2.1.1 software. It was found that, the steric field was the major factor towards the herbicidal activity of the target compounds against B. campestris L., and the introduction of bulky groups into m- and p-position of the benzene ring was favourable to increase the herbicidal activity. This kind of title compounds deserved further study as potential leading compounds for the discovery and development of novel herbicidal agents. [ABSTRACT FROM AUTHOR]