Lithium⁃sulfur batteries are expected to become the next generation of specific energy storage batteries to replace lithium⁃ion batteries due to their significant advantages such as high specific capacity, high energy density, low cost, and environmental friendliness. However, the practical application of lithium⁃sulfur batteries is severely limited by a series of problems existing in electrode materials, such as lower ion/electron conductivity, shuttle effect of polysulfides, large volume changes during charge and discharge, and the stability of lithium anodes and so on. Combining sulfur with various carrier materials to improve the utilization of active materials and battery cycle stability has become a current research hotspot. Among the reported carrier materials, metal organic frameworks with rich pores and open active sites and their derivative materials have attracted wide attention because of their excellent structural characteristics. This review summarized the recent research progress of metal organic frameworks and their derivatives in improving the cycle stability of sulfur cathodes, and prospected its development trends in lithium⁃sulfur batteries.

The research progress of changing the final active phase of the catalyst by using complexing agents during the preparation of oil hydrodesulfurization catalysts is discussed. The common complexing agents and their effects on catalyst performance improvement under different usage methods are introduced. The effect of the complexing agent on the microstructure of the catalyst is systematically described, and the reason of the complexing agent can improve the performance of the catalyst is explained.

      Pressure machine inlet filter short piping could produce cracks in a short time. Crack parts of the macroscopic examination, chemical composition analysis, tissue imaging, scanning electron microscopy analysis, and mechanical analysis were studied. The results showed that in the corrosive medium containing H ₂S, the flange and the nozzle were subjected to welding residual stress during the manufacturing process, and the welding residual stress caused stress corrosion, resulting in cracking along the embrittlement.

Corrosion inhibition effect of N(4sulfonic acid) butyl triethylammonium hydrogen sulfate((CH2)4SO3HTEA\]\[HSO4]) acid ionic liquid(IL) towards Q235 steel corrosion in 0.5 mol/L HCl solution was investigated by electrochemical measurements in 25 ℃. The results show that the IL suppressed corrosion processes of Q235 steel in HCl solutionand the best performance of inhibition could be obtained with the concentration of inhibitor 14 mmol/L. The X-ray photoelectron spectroscopy(XPS) demonstrates that the protectiue film is formed by adsorption on the Q235steel surface, which can cover the reative center and inhibit the Q235 steel corrosion in HCl solution.

Turbine rotor fault diagnosis is the key to ensuring the safe operation of the steam turbine. Vibration signal analysis is widely used in turbine rotor fault diagnosis. The wavelet packet analysis method was adopted to extract the vibration signal eigenvalue as the input of BP neural network, the nonlinear mapping relationship between signal features and fault type and realizing the fault diagnosis with BP neural network was established. The simulation results show that this method can effectively diagnosis turbine rotor fault.

A 110 days'experiment was carried out to study a pilot-scale integrative A/O(anaerobic/ aerobic) MBR treating domestic wastewater from an university. Influent wastewater was stopped from day 51 to day 56 and the activated sludge was feeded by faecula and urea, and inlet was restarted on day 57. Chemical Oxygen Demand(COD)，Biochemical Oxygen Demand(BOD5)，Ammonia Nitrogen(NH+4N) and Total Phosphorus (TP) concentration was investigated in different part of the system. The average removal efficiency of COD,BOD5, ρ(NH+4-N),TP was 95.10%，90.96%，93.02% and 93.37%, respectively, mainly digested in anoxic tank. MLSS and SV in the aeroic tank increased gradually and stayed steadily on 8 600 mg/L and 85%, respectively. SVI was lower than 112.1 mg/L during the whole experiment. The value of MLVSS/MLSS, which reflects the sludge activity, descended slightly in 110 days'study, especially on the anaphase. The results shows a promising future for the application of this system for municipal wastewater reclamation.