Method of Detecting System Function by Measuring Frequency Response

Real time battery impedance spectrum is acquired using one time record, Compensated Synchronous Detection (CSD). This parallel method enables battery diagnostics. The excitation current to a test battery is a sum of equal amplitude sin waves of a few frequencies spread over range of interest. The time profile of this signal has duration that is a few periods of the lowest frequency. The voltage response of the battery, average deleted, is the impedance of the battery in the time domain. Since the excitation frequencies are known, synchronous detection processes the time record and each component, both magnitude and phase, is obtained. For compensation, the components, except the one of interest, are reassembled in the time domain. The resulting signal is subtracted from the original signal and the component of interest is synchronously detected. This process is repeated for each component.

Mouse in the House: Deer Mouse and Sin Nombre Virus Dynamics in Montana

Sin Nombre virus is a strain of Hantavirus that causes the sometimes fatal human illness Hantavirus Pulmonary Syndrome. The reservoir host of SNV is the deer mouse. Deer mice are found in a wide variety of habitats including peridomestic (in and around buildings) settings. Amy provides an overview of hantaviruses and discusses the research she has been conducting on the SNV/deer mice system since 1995 (in Arizona) and 1999 (in Montana).