Abstract: Systems and methods are provided for ozonolysis of polycyclic aromatic hydrocarbons (PAHs) in a liquid CO2 reaction environment. It has been unexpectedly discovered that oxygen-containing functional groups can be added to PAH substrates while substantially avoiding combustion reactions and while reducing or minimizing formation of energetic intermediates. Because the formation of energetic intermediates is minimal, the ozonolysis can be performed at temperatures near ambient (e.g., between ?10° C. and 50° C.) while still achieving a satisfactory safety profile. In various aspects, ozonolysis can occur while forming a reduced or minimized amount of water, such as forming substantially no water in the reaction environment.

Abstract: An irrigation device, including: a rain barrel; a water pump; a humidity detector; a permeable pipe; a control unit; a first valve; a second valve; a cleaning unit. The permeable pipe includes a plurality of circumferentially-distributed bores. The rain barrel, the water pump, the first valve and the permeable pipe are connected sequentially. The humidity detector is adapted to detect a humidity of a green land. The humidity detector and the permeable pipe are disposed in the green land. The rain barrel is connected to a municipal sewage pipe via the second valve. The cleaning unit is disposed in the rain barrel for cleaning the inner wall of the rain barrel. The first valve, the second valve, the humidity detector, and the cleaning unit are all electrically connected to the control unit.

Abstract: An irrigation device, including: a rain barrel; a water pump; a humidity detector; a permeable pipe; a control unit; a first valve; a second valve; a cleaning unit. The permeable pipe includes a plurality of circumferentially-distributed bores. The rain barrel, the water pump, the first valve and the permeable pipe are connected sequentially. The humidity detector is adapted to detect a humidity of a green land. The humidity detector and the permeable pipe are disposed in the green land. The rain barrel is connected to a municipal sewage pipe via the second valve. The cleaning unit is disposed in the rain barrel for cleaning the inner wall of the rain barrel. The first valve, the second valve, the humidity detector, and the cleaning unit are all electrically connected to the control unit.