MEMS resonators with interdigital transducer (IDT) based on aluminum nitride (AlN) thin-film (a few micrometers thickness) materials gradually arouse researchers' interest due to their ability to excite multiple modes of acoustic waves. However, the low electromechanical coupling coefficient is still one of the main reasons that limit the AlN-based resonators. In this article, we demonstrate a design journey for 10% scandium-doped AlN-based dual-mode acoustic wave resonators. Also, we investigated the influence of stack architectures with and without introduced AlN interlays, as well as the influence of stacked film thicknesses, on the performance of resonators. Simulation results show that changes in the SiO2 film thickness have different effects on the TCF of the two acoustic wave modes, providing a way for sensors to decouple two parameters that jointly affect the frequency drift. Moreover, measured results show that the introduced AlN interlayer (AlN-IL) induces a better cryst
very much, nick hamilton. how does the rise in temperature effect plant life and animal numbers? a group of scientists have spent time in the antarctic hoping to find answers. cute and, so it turns out, pretty crucial. these penguins are native to this part of the antarctic. unlike other animals, they live mostly on the land rather than the ocean which makes them easier to track. , .. . ., ., to track. penguins can come to the sea over to track. penguins can come to the sea over and to track. penguins can come to the sea over and over, - to track. penguins can come to the sea over and over, year - the sea over and over, year after year, and so we have this reliable signature of how many individuals there are one year to the next and how this plays out over decades or even longer time scales. out over decades or even longer time scales-
ought to be increasing, not decreasing. evidence of the bergdahl swap shows the president is determined to get that installation down to its lowest temperature effect regardless of safety around the world. reality may overtake him as it has in so many other examples. he talks about people going back to terrorism. let s be clear. the people interned at gitmo were terrorists before they have got there and this isn t a question resaid krism of of we it isn t a question of recidivism. bill: john bolton is the ambassador in las vegas getting