Abstract: Pseudomonas and a use thereof are provided. The preservation number of the Pseudomonas is CGMCC No. 22583. The growth temperature of the Pseudomonas is 37-45° C. Under a medium-high temperature oil reservoir condition, the Pseudomonas can be denatured from a non-viscosity fluid to a multifunctional oil-extraction bacterial solution having both surface activity and viscoelasticity, and also has the functions of expanding the swept volume and improving the oil washing efficiency. The recovery ratio is increased by more than 20% in a physical simulation experiment.

Abstract: Disclosed in the present application are a projection device and a method for the projection device. A projection device comprises a light modulation assembly, a lens, a distance sensor, an image collection device and a controller. The method comprises: in response to a start-up instruction for a projection device, starting the projection device; detecting whether there is a blocking object between the projection device and a projection surface according to the positional relationship between a lens, a distance sensor and an image collection device on a first plane and a distance measurement value of the distance sensor, wherein the first plane is a plane on the projection device that is parallel to the projection surface during projection, and the projection surface is used for receiving and displaying projection content, which is projected by a light modulation assembly.