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Zhejiang Province is both the birthplace of the theory that both the mountain of gold and silver and the lushmountain with lucid waters are required (also known as the Two Mountains theory) and the first ecological province in China. The study on the vegetation ecological quality of Zhejiang can be used as an important reference for the construction of ecological civilization. Based on multi - source remote sensing data and meteorological observation data, this study investigated the spatio - temporal variations of vegetation ecological quality in Zhejiang during 2000-2020, as well as their response to climate factors and human activities. The results show that: (1) Both the fractional vegetation cover (FVC) and the net primary production (NPP) in Zhejiang showed an upward trend during 2000-2020, with significantly increased vegetation greenness; (2) The vegetation eco - environmental quality in Zhejiang showed a fluctuating upward trend during 2000-2020, with the vegetation ecological quality indices (VEQIs) of mountainous areas significantly higher than those of basin and plain areas; (3) The dominant factor driving the VEQI variations in Zhejiang during 2000-2020 is human activities, while climate factors occupied a dominant position only in some areas of southwestern Zhejiang. This study deepens the understanding of the spatio - temporal variations of vegetation ecological quality in Zhejiang and their driving factors and, thus, is of great significance for the construction of ecological civilization in Zhejiang and even other regions in China. [ABSTRACT FROM AUTHOR]

The ANSYS Fluent 2020 R2 software is used to study the flow and combustion characteristics of a new type biomass circulating fluidized bed boiler. The velocity distribution characteristics, particle separation efficiency and temperature field distribution in the built-in cyclone separator are studied. The results show that the velocity distribution of the flue gas in the cyclone separator decreases gradually from periphery to center, which can form the vortex area. When excess air coefficient is between 1.15-1.2, the separation effect of the separator is the best, which can reach more than 96.5%. The excess air coefficient obviously affects the combustion condition in the boiler, with the increase of excess air coefficient, the temperature increases first and then decreases, and the optimal excess air coefficient is 1.15. [ABSTRACT FROM AUTHOR]