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Junhui Zhu,Zhiwei Tan,Weijun Yang 한국고분자학회 2017 Macromolecular Research Vol.25 No.8
A series of conjugated metalloporphyrin polymers (MPP-AMnPs) were synthesized by using inexpensive, environmentally friendly and high-efficiency CuI/N,N-dimethyl glycine as catalytic system, and 5,10,15,20-mesotetra(4-aminophenyl) porphyrin manganese and p-dibromobenzene as building blocks. Scanning electron microscopy, N2 adsorption-desorption isotherms and scanning electron microscopy indicated that the polymers had large surface areas and homogeneous microporous structures. Thermogravimetric analysis showed that the polymers had remarkable thermostability. The catalytic performance of MPP-AMnP was tested by oxidizing cyclic ketones with dioxygen as oxidant. The conversion was high in a mild environment in l,2-dichloroethane solvent at 60 °C. Moreover, MPPAMnP remained stable in the reaction process and highly catalytically active after ten successive recycles.
Shaogan Ye,Junhui Zhang,Bing Xu,Wei Song,Long Chen,Haiyong Shi,Shiqiang Zhu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Erosion damage affects the reliability and durability of axial piston pumps. An axial piston pump was tested using endurance life testing method. The phenomenon of erosion damage on the valve plate was observed using a confocal laser scanning microscope, by comparing the surface on the valve plate before and after the endurance life testing. A CFD turbulence model inclusive of the cavitation effects was developed to predict the flow physics. The flow physics in the axial piston pump were presented and analyzed, including the fluid velocities, velocity fields, the total volume fraction fields of gas and vapor, and pressure fields. Two causes of erosion damage were found, the appearances of large amount of vapor, and directly hitting by the jetting flow. The first one is the cause of erosion damage on the surface near the transition region from the inlet port to the outlet port, and the second one is the cause of erosion damage on the surface near the transition region from the outlet port to the inlet port. Besides, the findings show that the fluid velocities closely relate to the area of erosion damage. The study provides insights into the occurrence of erosion damage in axial piston pumps.