Polariton lasing in InGaN quantum wells at room temperature

In this paper,we report the exciton polaritons in both positive and negative detuning micro cavities based on InGaN multi-quantum wells(MQWs)and the first polariton lasing in InGaN/GaN MQWs at room temperature by utilizing a 4.5λFabry-Perot(F-P)cavity with double dielectric distributed Bragg reflectors(DBRs).Double thresholds corresponding respectively to polariton lasing and photonic lasing are observed along with half-width narrowing and peak blue-shifts.The threshold of polariton lasing is about half of the threshold of photonic lasing.Our results paved a substantial way for ultra-low threshold lasers and room temperature Bose-Einstein Condensate(BEC)in nitride semiconductors.

Novel asymptotic stabilisation conditions of nonlinear fractional-order composite systems via the decentralised control

In this paper,we consider decentralised control of a nonlinear fractional-order composite system and show novel sufficient conditions for the asymptotic stabilisation of the fractional-order composite system by a set of local state feedback controllers.First,we design a local state feedback controller for each nonlinear fractional-order subsystem and a Lyapunov function that guarantees the stabilisation of the isolated nonlinear fractional-order subsystem by the controller.Then,we construct a vector Lyapunov function from the set of the Lyapunov functions,and show the stabilisation of the nonlinear fractional-order composite system.Finally,two numerical simulation examples of the nonlinear fractional-order composite systems are performed to show the correctness and usefulness of the proposed decentralised control.

The Absurd and the Comical in The Piano in a Factory

Whereas scholarship on Zhang Meng＇s acclaimed film The Piano in a Factory is scarce and mainly focuses on working-class identities, the present article contributes to the discussion by investigating the film＇s tragicomic style. By taking an existentialist viewpoint about the absurd, it demonstrates that the furloughed workers in fact live in an absurdist existence. Moreover, the changing era rather than character flaws is blamed for the absurdity. Specific images are examined in order to reveal a symbolism having to do with the demise of industrialism and the advent of commercialism. While absurdity is the undercurrent, the characters use humor as a strategy to evade, elude, and cope with life. The third section employs theories of comedy to investigate the comicality of the movie, which derives from exaggeration of negative traits in the characters. The paper argues that by manipulating the scenario at the end, Zhang holds out hope for the working-class＇ future. Piano is hence able to transcend the absurdist existence and end up with joy, hope and faith.