低喹啉不溶物含量煤沥青的研制及其炭化行为探讨

以煤焦油为原料，选用正已烷和苯混合溶剂，通过溶剂革取分离和蒸馏，制备得到低喹啉不溶物含量净化煤沥青。在不同条件下对所制取的低喹啉不溶物含量煤沥青进行炭化热处理，分析了净化沥青的炭化行为。将净化沥青炭化产物制成光片，观测其显微组织结构特征和中间相球体的生长发育，判定作为针状焦和碳纤维原料的可能性。     

Event-Triggered L1-Gain Control of Nonlinear Positive Switched Systems

This paper is concerned with the event-triggered L_1-gain control of a class of nonlinear positive switched systems. First, an event-triggering condition in the form of 1-norm is presented for the systems. By virtue of the event-triggering strategy, the original system is transformed into an interval uncertain system. An event-triggered L_1-gain controller is designed by decomposing the controller gain matrix into the sum of nonnegative and non-positive components. Under the design controller, the resulting closed-loop systems are positive and L_1-gain stable. The obtained approach is developed for the systems subject to input saturation. All presented conditions are solvable in terms of linear programming. Finally, two examples are provided to verify the effectiveness of the design.