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Donor and acceptor ions serving as extrinsic defects in piezoelectrics are mostly used to improve the performance merits to satisfy the industrial application. However, the conventional doping strategy is unable to overcome the inherent trade-off between the piezoelectric coefficient (d33) and mechanical quality factor (Qm). Herein, inspired by the valence state variation observed in manganese oxides during sintering, this study focuses on manipulating intrinsic oxygen vacancies and extrinsic manganese defects in potassium sodium niobate (KNN) ceramics via heat treatment. The annealing process...

Rehabilitation of children with arthrogryposis (congenital joint defect) might be facilitated by brain stimulation.

The crisis of family accept rations. thank you all for being here. tiffany,t s gift to get through that first block of television without crying, quite frankly because you -- you know, you're talking about taking a breast-feeding child from their mom. it just doesn't get any worst than that. right? >> yeah. >> and so i wonder just on the politics of this, you have some republicans expressing a discomfort with it. but no republican signing on to the democratic bill that would actually end it. so where are we now in terms of the politics of this? >> this puts a $25 billion price tag on these und...