Narrow Results

This paper aims to investigate the impact of moisture on mechanical properties of insulation paper. According to the molecular modeling approach proposed by Theodorou, the amorphous cellulose models of insulation paper with different moisture contents were built up to calculate mechanical parameters and hydrogen bond networks. And relevant conclusions could be drawn through further analysis on these calculation results: water molecules can destroy hydrogen bond network between the neighboring cellulose molecules, which might be responsible for the significant decrease of Young's modulus and other mechanical parameters, while no appreciable effect of intramolecular hydrogen bonds on mechanical properties was detected. Thus tensile tests were also carried out to study the moisture influence on the Young's modulus, by which the result of the simulation was approved.

High sensitivity and response ratio of magnetoimpedance (MI) sensors have raised interest for using them in different environments for detection of weak magnetic fields of magnetic elements even though the high dependence of the MI response to the surface condition of the MI sensor has limited its application in some environments. In this study, we investigate the effects originating from the MI measurement in moisturized air. Using scanning electron microscopy (SEM) images, it is observed that the surface of an Fe-based MI sensor has become rough and granular after the presence of moisture on its surface. Results can be useful for developing MI sensors for use in different environmental conditions.

The paper investigated the activity of bromelain extracted from fresh pineapple juice over three years to figure out the optimal harvest time for bromelain in the Zhanjiang region. The method of statistical analysis had been used for determining the bromelain activity in every month of a year. Meanwhile, the average moisture content and activity of bromelain in were month were linear analysis. The results indicated that November was the best time for bromelain production and processing in a year; the average bromelain activity of November reached 1.089×10⁶ U/g. The outcomes demonstrated that both of temperature and humidity played important roles in bromelain production.