A new efficient synthesis for 2-thiopteridine-4,6,7-triones (6-10, 15) has been found in the condendation of the appropriate 5,6-diaminopyrimidine (1-5, 14) with oxalic acid in DMF.Analogous condensations with dimethyl oxalate led to S-alkylation probably via an intermediate O-methylation of Food Service:Commercial Kitchen Equipment:Cooking Equipme
Experimental study on the synchronization mechanism and trigger characteristic density of vertical evacuation in crowds
Abstract Due to simultaneous horizontal and vertical displacement during vertical evacuation, the consequences of stampede congestion accidents can be more severe.Generally, pedestrians trigger a synchronization mechanism Christmas Ornament at some point during the vertical evacuation process.This synchronization behavior helps prevent stampede con