No abstract

Weather is one of the main risk factor in power grid dispatching operation and this paper studies how to identify and establish a model of weather risk sources during power system dispatching operation for smart grid. A qualified weather risk sources model, which can comprehensively reflect temperature, wind speed, visibility, rainfall, relative humidity, thunder and lightning harm degree these six meteorological factors, is established; information entropy theory has been introduced to weigh the comprehensive impact of these six meteorological factors in real-time objectively and quantitatively; linear penalty function has been used in amending meteorological entropy value to define comprehensive meteorological factors, which can quantify the influence weather risk sources have on dispatching operation. Finally, the model's validity is verified based on the practical calculation of Guangzhou City, the result showing the model can reflect the actual weather situation of the devices in the being operated area and accurately assess the potential risk which multiple meteorological factors have on power grid dispatching operation. Through the joint between the model and numerical weather prediction, automation level of risk sources identification in power grid dispatching operation is enhanced greatly. So far, the model has been put in use in Guangdong Power Grid. Keywords-power grid dispatching operation; risk assessment; weather risk sources identification; comprehensive meteorological factors(CMF): variable weighted entropy theoryWeather risk factors

Black soldier fly is a saprophagous insect that has been widely reported in recent years due to its excellent performance in bioremediation. Due to the widespread presence of flocculants in the organic waste treated by black soldier fly larvae, this study aimed to evaluate the potential impacts and risks of flocculant addition (a combination of poly aluminum chloride and polyacrylamide with the ratio of 50:1). Results showed that the growth and weight of BSFL in the high-exposure groups (≥200 mg/L) were inhibited. The bioaccumulation of aluminum (Al) in larvae was estimated, and the proportions of different Al forms in the frass from high to low were the residual state (41.38 to 67.92%), water-soluble state (16.88 to 37.03%), acid-soluble state (8.45 to 18.72%), and alkali-soluble state (3.38 to 5.14%). The relative abundance of bacterial genera related to lipid metabolism decreased with increasing flocculant concentrations while disease-related taxa increased in relative abundance. The results serve as a reference for subsequent research and application of the treatment of flocculant-contaminated waste by BSFL.