Study on the Mechanism of Heterogeneous Catalysis (3) —The Catalysis of W, Mo, S and SiO₂on Carbon Dissolving and Mechanism of Carbon Dissolving in the Iron-Graphite Compact

This is an article that validates Electron Cyclic Donate-Accept Catalysis Mechanism-ECDAM or Electron Orbital Deformation-Recovery Cycle Catalysis Mechanism-EODRM. In this paper, the influence of compact density, sintering temperature and time, vacuum degree, atmosphere and alloying element on the carbon dissolving rate into γ-Fe were studied. The experiment results have been reported. The way that the carbon is dissolved into γ-Fe was discussed. Gas phase composition and temperature play an important role on the carbon dissolving rate. The carbon gasification reaction is the determining step of dissolving carbon process. K2CO3, W and Mo are a catalysts, and their active size are K2CO3 > W > Mo. S and SiO2 are a poison, and their poison size are SiO2 > S. The experiment results are completely consistent with the original judgment of ECDAM.

Microbiota changes on the surface of pig carcasses during refrigerated transportation and marketing

We investigated changes in the microbiota composition on the surface of pig carcasses during refrigerated transportation of different distances(200,300,400,500 km)and further transferring to the market place.Microbial samples were obtained by sterile swabs at the starting point,the end points of transportation and the market points.Core temperature of pig carcasses,temperature and air humidity in refrigerated vehicles were also tracked.The air temperature and humidity in the refrigerated vehicles remained relatively constant during transportation.However,the air temperature and carcass temperature at the end points of transportation were the highest for the 500 km group and the lowest for the 400 km group(P<0.05),while the air humidity was the highest for the 200 km group and the lowest for the 400 km group(P<0.05).Microbial colony counts showed a slight increase during transportation and differed among five sampling points on the surface of pork carcasses with the highest for the outside of the shoulder and the lowest for the inside of the belly(P<0.05).Microbiota composition changed greatly and Acinetobacter,Pseudomonas,Psychrobacter,Chryseobacterium,Staphylococcus,Brochothrix,Morexella,and Flavobacterium were the predominant genera.Pseudomonas was the most predominant during transportation.