In order to solve the problem of low gas production biogas digester fermented at natural temperature in winter and possibly freezing northern cold areas, combined with solar heating system is proposed maintain normal fermentation ensure continuous efficient throughout year. Through experiment analysis system, area, can be maintained above 12.5 °C, which meet requirements digester, so it conclud...

Traditional hydraulic drive experiments present a number of challenges. During the transmission experiment, equipment is easily damaged and must be frequently updated, which makes it difficult for large students to study at same time; traditional offline, monotonous, boring make increase their interest in learning from what inherent; most undergraduate have home due impact COVID-19. Therefore, ...