Presented herein are system, method, and apparatus for displaying pictures on a display. DOD produced by the method of the present invention can be effectively used as an antibacterial agent because it has a wide spectrum of antibacterial activity against various microorganisms. A method of making the sol-gel solution is by mixing suitable sol-gel precursors to form the solution, stabilizing the solution by adding at least one baseline stabilization reagent, deactivating the solution by adding at least one surface deactivation reagent to the solution, and reacting the solution in the presence of at least one catalyst. The streamlined contour is generally conical in some of the embodiments. The motor rotationally and reciprocally drives the nozzle holder to sequentially position each of the nozzles in alignment with an inlet port of mass spectrometer. In an example, the system may choose a service vehicle from a base station closest to or within the shortest driving time to the disabled vehicle.