In this paper, bagasse cellulose was dissolved in ionic liquid (1-butyl-3-methylimidazolium chloride) by microwave heating. The orthogonal test and variance analysis were applied to obtain the optimum dissolution condition of bagasse in ionic liquid. The effects of microwave power, temperature and the mass fraction of cellulose were examined by an orthogonal experiment designed through the different dissolution time and the yield of regeneration bagasse. Results showed that the optimal dissolution condition for faster dissolution time was 1% of bagasse cellulose in ionic liquid at 140°C, 500W; while, to get the most yield of cellulose, the condition was 2% of bagasse cellulose at 130°C, 500W.
In the digital era, a large amount of data is generated every day and recorded on the storage system. Access control is an important mechanism for ensuring data privacy and security. Data accessing control model of traditional storage system is centralized, which has threatened the information security of users. As blockchain is emerging technology which is widely used in the area of data privacy preserving, in this paper we proposed a decentralized access control model via blockchain based smart contracts implementation. Once satisfying the conditions set by users, visitors could apply to the blockchain for authentication, then obtain permission to access user data and operate the data, finally achieving secure access control of user data. In our experiment, we build the blockchain system based on Hyperledger Fabric project and evaluate both the efficiency of writing and the verification of access permission. The result shows our model’s usability and efficiency.
In this study, a strain of cellulolytic bacterium named N-6 was isolated from lake Huguang Maar. Phylogenetic analysis based on a partial 16s rDNA sequence showed that the strain was Bacillus cereus. Extracellular cellulase produced by the strain Bacillus.cereus N-6 exhibits optimum activity around pH 8.0 at 50°C and has good pH tolerance in the range of 6-9.
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