Abstract: The present disclosure relates to the technical field of microwave absorption, and in particular, to a multi-layer wave absorber structure and use thereof. The multi-layer wave absorber structure has a sandwich structure, and an intermediate layer of the sandwich structure is an electromagnetic loss-free dielectric layer. The electromagnetic loss-free dielectric layer includes a vacuum layer, an air layer, a paraffin layer, or a polytetrafluoroethylene layer. The added electromagnetic loss-free dielectric layer enhances impedance matching by modulating phases of electromagnetic waves, such that loss of the electromagnetic waves in a composite wave absorbing layer of the multi-layer wave absorber structure is enhanced, and an effective absorption bandwidth is further improved.

Abstract: Systems, methods, and non-transitory computer readable media can detect whether one or more media content items have been captured by a user. One or more candidate media content items to include in a suggested post for the user can be determined based on one or more of: specified criteria or a machine learning model. The suggested post for the user including the one or more candidate media content items can be generated. The suggested post can be provided for display in a user interface.

Abstract: The present disclosure is directed toward systems and methods for reengaging website visitors via a social networking system. For example, in accordance with one embodiment, a social networking system receives information regarding a user-triggered event associated with a merchant webpage, utilizes the received information to generate an electronic message from the merchant to the user, and provides the electronic message to the user via the social networking system. The user can then reengage with the merchant in response to the received electronic message.