Abstract: A navigation method that includes building a virtual map database of maps for structures that block GPS signals, wherein the virtual maps are created from speed and direction measurements taken from motion sensors of the mobile devices of users of a geographic information system (GIS) map server; and starting a navigation session by a user employing a navigation application that employs the GIS map server. The GIS map server includes GIS map data, and virtual map data from the virtual map database. The virtual map data is for navigation instructions without a GPS signal. A start location is set using the GIS map data to provide the initial start location; and directions are provided to the start location using a virtual map data from the virtual map database.

Abstract: An organic electroluminescent device adopts a TADF material as a first host material (6) of a green light unit (302) to sensitize a green phosphorescent material serving as a first guest material (7). A portion of triplet excitons are converted into singlet excitons through inverse gap crossing, and thus decrease of the triplet exciton concentration results in narrowing of the recombination region, thereby preventing the triplet excitons from diffusing into a blue light layer (4) to emit light, so as to realize a green light spectrum containing no blue light component. And because an energy level difference between red light and blue light is relatively large, carriers in a red light unit cannot be easily transferred to the blue light layer, and therefore it is not easy for a blue light component to appear in a red light spectrum.

Abstract: In an approach to predicting issue development trends based on generated ordered association rules, one or more computer processors subdivide an issue into a set of one or more subproblems. The one or more computer processors generate ordered association rules by inputting the set of one or more subproblems into a model trained with historical subproblems, historical solutions, and historical ordered association rules. The one or more computer processors determine one or more solutions for each subproblem in the set of one or more subproblems utilizing the generated ordered association rules. The one or more computer processors present the one or more determined solutions.

Abstract: A navigation method that includes building a virtual map database of maps for structures that block GPS signals, wherein the virtual maps are created from speed and direction measurements taken from motion sensors of the mobile devices of users of a geographic information system (GIS) map server; and starting a navigation session by a user employing a navigation application that employs the GIS map server. The GIS map server includes GIS map data, and virtual map data from the virtual map database. The virtual map data is for navigation instructions without a GPS signal. A start location is set using the GIS map data to provide the initial start location; and directions are provided to the start location using a virtual map data from the virtual map database.

Abstract: An organic electroluminescent device adopts a TADF material as a first host material (6) of a green light unit (302) to sensitize a green phosphorescent material serving as a first guest material (7). A portion of triplet excitons are converted into singlet excitons through inverse gap crossing, and thus decrease of the triplet exciton concentration results in narrowing of the recombination region, thereby preventing the triplet excitons from diffusing into a blue light layer (4) to emit light, so as to realize a green light spectrum containing no blue light component. And because an energy level difference between red light and blue light is relatively large, carriers in a red light unit cannot be easily transferred to the blue light layer, and therefore it is not easy for a blue light component to appear in a red light spectrum.