Systems and methods provide a single reader single writer queue structure having entries that can be concurrently accessed in an atomic manner with a single memory access. In accordance with at least one embodiment, the first core and the second core are made of a material having a coefficient of thermal expansion larger than that of the first mold and the second mold, and outer diameters of the first core and the second core are each formed to be smaller than diameters of the first core hole and the second core hole. A central controller uses threshold detection to monitor signal power at each stage of the receiver signal path as well as overall signal gain. Processing of the temporal signals using correlation, differentiation andor semblance techniques is used for determination of the flow velocity of one or more fluids in the borehole. Consequently, the conductivity of the nanowires of the sensor andor switch increases in the presence of hydrogen.