The uniaxial pressure experiment was carried out on the whole-age marine cement-based materials. By analyzing this type of material, there is obvious early strength and late strength decay. The X-ray diffraction experiment was carried out on the sample before the pressure test. After the crushing, the characteristic samples were taken for multi-scale electron microscopy. The microstructure of the material was divided into the strengthening region and the weak region, and the microscopic damage process was summarized.

In order to improve the knowledge of the microplastic pollution in the sparsely populated area, a preliminary monitoring survey was carried out in the northwest of China. Microplastics were evaluated in 28 soils collected from 6 sites by the methods of density separation and identified by microscope and Flourier infrared spectrum instrument. Microplastics were detected in all sampling points but the abundances, morphologies and polymers varied in different sampling points due to the natural conditions and anthropogenic influences. And the size of the detected microplastics is larger in comparison with other study areas. But with time, the degraded microplastics still could threat the ecology and environment. This study is helpful to get the whole pictures of microplastics around the world.

In recent years, the Internet technology has been deeply influencing recycling industry to make it more intelligent and interconnected. However, most existing papers on "Internet Recycling" neglected the problem of pricing strategy under online and offline channels for different levels of recyclers. Moreover, the effect of regional differences has been emphasized a lot in dual-channel forward supply chain, but recycling field has seldom been concerned about it. In this paper, a recycling system consisting of one recycling center and several third-party recyclers (TPR) was investigated based on traditional mode and dual-channel mode. The dual-channel reverse supply chain model is transformed from traditional mode by the introduction of online channel. It involves two recycling modes, as recycling centre for online recovery and "Recycling center+TPR" for offline recovery. By establishing pricing strategies based on Stackelberg game model, the impacts of regional differences were analysed. Finally, numerical analysis was given to illustrate the effectiveness of the pricing mechanisms and strategies.

Based on the current status of configuration file management and control, in smart substation, this paper introduce the function composition of configuration file management and control system in smart substation. It includes management process, control strategy and so on.

For the first question, we establish two main models for SSA drones and repeater drones respectively. For repeater drones, we establish a grid search model, aiming at terrain, repeater range limits and other restrictions, by gradually removing the grid points, work out the optimal position and quantity of the repeater drones. For SSA drones, we also use the grid search model, considering the flight parameters of SAA drones, to find the position of the charging station (EOC) and fully meet the charging needs of SSA drones. Considering the impact of the size of fire, we divide the size of the fire into three levels, which correspond to different SSA drones demand quantities, and referred to the VRPTW algorithm to solve the TSP problem with different node requirements. Finally, we use genetic algorithm to optimize.

Improving the microbial degradation capacity of food waste (FW) is a great challenge due to its acidity and high salinity. In this paper, an anti-acidification and salt-tolerant microbial consortium (AASTMC) obtained from acid and salinity mutagenesis of Bacillus amyloliquefaciens, Bacillus cereus , Yarrowia lipolytica , and Trichoderma reesei was used to degrade residential food waste. The process parameters that influenced the degradation rate of organic matter were identified by response surface methodology (RSM) with a central composite design (CCD). The effect of inoculation amount, temperature, and bulk density on the degradation rate of organic matter decreased in turn. The degradation rate of organic matter reached 94.87% under the optimum parameters of inoculation amount: 5%, bulk density: 0.04 g/cm 3 , and temperature: 32.33°C.