A method for monitoring a mixing ratio of a mixture of materials flowing through a conduit in a composite material production process. The conduit is arranged between an inlet for receiving the mixture and a curing assembly. The method comprises: obtaining an acoustic signature of the mixture of materials; controlling a transducer to emit an acoustic wave into the conduit; controlling a receiver to detect the acoustic wave after propagation of the acoustic wave through the conduit; and comparing an acoustic signature of the detected acoustic wave with the obtained acoustic signature to obtain monitoring data.

An example system includes at least one acoustic sensor configured to generate at least one time-dependent acoustic data signal indicative of an acoustic signal generated by an nuclear power plant performing a process possessing a plurality of process attributes, and a computing device including an acoustic data signal processing module configured to receive the at least one time-dependent acoustic data signal, and transform the at least one time-dependent acoustic data signal to a frequency-domain spectrum, wherein each process attribute of the plurality of process attributes is associated with at least one respective frequency band, and a correlation module configured to determine a process attribute of the plurality of process attributes by identifying at least one characteristic of the frequency-domain spectrum.

Technologies for harmonic acoustic manipulation of colloidal particles include a system having a piezoelectric substrate coupled to one or more segmented acoustic transducers and a fluid positioned above the substrate. The segmented transducers have multiple segments, each with a resonant frequency equal to a harmonic frequency. The system further includes a controller that generates a harmonic signal including multiple harmonic components and applies the signal to the segmented acoustic transducers to generate an acoustic potential field in the fluid and manipulate the colloidal particles. The system may translate or rotate the particles, and may form the particles into a colloidal crystal monolayer. The system may selectively pair or otherwise group and separate individual particles. The system may pair and separate multiple groups of particles. The system may measure adhesion between particles. The system may pattern particles over a surface. The colloidal particles may be cells.

Various examples are directed to apparatus and methods for acoustic pest detection, to provide enhanced pest detection and enhanced battery life for a power supply of a pest detection device. The pest detection device includes an acoustic or vibration sensor and a controller connected to the acoustic or vibration sensor. The controller is configured to detect, identify, or detect and identify one or more pests based at least in part on comparing one or more signals received from the acoustic or vibration sensor with a predetermined sound or vibration profile of the one or more pests.