Abstract: A method includes acoustically exciting a rotating component over a range of frequencies. The method further includes measuring the resulting frequency response of the rotating component in response to the acoustic excitation. The method also includes processing the frequency response to determine whether a frequency response has shifted in comparison a prior frequency response. The method includes determining an amount of wear and tear of the rotating component based on the determined shift in the frequency response.

Abstract: A system includes an acoustic transmitter, an acoustic receiver, a memory component, and a processor. The acoustic transmitter transmits an acoustic signal into a material with an unknown moisture level and changes into an acoustic response signal after passing through the material. The acoustic receiver receives the acoustic response signal associated with the material with the unknown moisture level. The memory component stores data comprising moisture levels associated with acoustic speeds of acoustic response signals. The processor is coupled to the acoustic receiver and to the memory and determines a speed of the acoustic response signal associated with the material with the unknown moisture level, and further determines an actual moisture level of the unknown moisture level of the material by associating the speed of the acoustic response signal associated with the material with the unknown moisture level to the data in the memory component.

Abstract: Metal aminoboranes of the formula M(NH2BH3)n have been synthesized. Metal aminoboranes are hydrogen storage materials. Metal aminoboranes are also precursors for synthesizing other metal aminoboranes. Metal aminoboranes can be dehydrogenated to form hydrogen and a reaction product. The reaction product can react with hydrogen to form a hydrogen storage material. Metal aminoboranes can be included in a kit.

Abstract: Metal aminoboranes of the formula M(NH2BH3)n have been synthesized. Metal aminoboranes are hydrogen storage materials. Metal aminoboranes are also precursors for synthesizing other metal aminoboranes. Metal aminoboranes can be dehydrogenated to form hydrogen and a reaction product. The reaction product can react with hydrogen to form a hydrogen storage material. Metal aminoboranes can be included in a kit.