Abstract: A method for creating a modified flight simulation program for a flight simulation system includes: obtaining a demonstration flight record associated with a preset track route of a virtual airplane; generating an add-on content pack for the flight simulation program based on the demonstration flight record; and merging the add-on content pack to the flight simulation program to create a modified flight simulation program. The generation of the add-on content pack includes: mapping the preset track route to geographical coordinate data in the real world, creating a first program module associated with a demonstration mode enabling a demonstration virtual flight along the preset track route, creating a second program module associated with an assisted flight mode enabling user control for a virtual flight within a free-flight space, and creating the add-on content pack that includes the first and the second program modules.

Abstract: An adsorbent for reducing uremic toxins in vivo includes polyacrylonitrile-based activated carbon fibers having the following properties: a) an average diameter of 5 ?m to 30 ?m; b) a BET specific surface area of more than 390 m2/g; c) a total acidic group content of larger than 1.2 meq/g or a total basic group content of larger than 1 meq/g. Because the adsorbent of the present disclosure has a higher adsorption capacity for precursors of uremic toxins than for the normal enzyme protein in intestinal tract, the adsorbent of the present disclosure can effectively prevent the deterioration of renal function, and thus can be used as a therapeutic agent and a preventive for kidney disease.