Abstract: Disclosed are devices, systems and methods for displaying a map for a user. A method of displaying a map for a user comprises: receiving, from a user device, a request to display the map for a geographical region around a vehicle, wherein the request identifies one or more layers of the map; retrieving, in response to the request, map data corresponding to the geographical region from a map database that stores a multi-layer representation of the geographical region; selecting, in response to the request, the one or more layers from the multi-layer representation; and displaying the map on a display of the user device based on the request.

Abstract: The present disclosure relates to the technical field of application of bioengineering technology in microbial oil recovery, and discloses a Brevibacillus agri strain and preparation thereof and a method for preparing surfactant, and use thereof. The Brevibacillus agri strain is deposited in the China General Microbiological Culture Collection Center under the accession number CGMCC No. 9983. The Brevibacillus agri and its preparation may effectively enhance the crude oil recovery; the method for preparing the surfactant allow the lipopeptide biosurfactant to have good physical properties, effectively reduce the surface tension, and have good emulsifying performance for petroleum, various hydrocarbons and lipids.

Abstract: A biochemical viscosity reducer for heavy oil and a preparation method thereof. The viscosity reducer includes: Brevibacillus borstelensis-fermented mixed lipopeptide solution: 30 to 60 parts; compound biological enzyme: 15 to 30 parts; plant-based nonionic surfactant: 10 to 20 parts; antibacterial agent: 1 to 5 parts; stabilizer: 1 to 5 parts; and alcohol solvent: 10 to 20 parts; where, the above components are measured by mass. The preparation method includes: step 1: adding 30 to 60 parts of a Brevibacillus borstelensis-fermented mixed lipopeptide solution, 15 to 30 parts of a compound biological enzyme, 10 to 20 parts of a plant-based nonionic surfactant, and 1 to 5 parts of a stabilizer to a reactor; and step 2: adding 1 to 5 parts of an antibacterial agent and an alcohol solvent to the reactor, and stirring a resulting mixture for 60 min to 120 min.

Abstract: The present disclosure relates to the technical field of application of bioengineering technology in microbial oil recovery, and discloses a Brevibacillus agri strain and preparation thereof and a method for preparing surfactant, and use thereof. The Brevibacillus agri strain is deposited in the China General Microbiological Culture Collection Center under the accession number CGMCC No. 9983. The Brevibacillus agri and its preparation may effectively enhance the crude oil recovery; the method for preparing the surfactant allow the lipopeptide biosurfactant to have good physical properties, effectively reduce the surface tension, and have good emulsifying performance for petroleum, various hydrocarbons and lipids.

Abstract: A biochemical viscosity reducer for heavy oil and a preparation method thereof. The viscosity reducer includes: Brevibacillus borstelensis-fermented mixed lipopeptide solution: 30 to 60 parts; compound biological enzyme: 15 to 30 parts; plant-based nonionic surfactant: 10 to 20 parts; antibacterial agent: 1 to 5 parts; stabilizer: 1 to 5 parts; and alcohol solvent: 10 to 20 parts; where, the above components are measured by mass. The preparation method includes: step 1: adding 30 to 60 parts of a Brevibacillus borstelensis-fermented mixed lipopeptide solution, 15 to 30 parts of a compound biological enzyme, 10 to 20 parts of a plant-based nonionic surfactant, and 1 to 5 parts of a stabilizer to a reactor; and step 2: adding 1 to 5 parts of an antibacterial agent and an alcohol solvent to the reactor, and stirring a resulting mixture for 60 min to 120 min.