Abstract: Systems and methods of a battery assembly are disclosed. The battery assembly includes an extruded housing, a plurality of battery cells within the extruded housing forming a plurality of cell blocks, and a circuit coupled to the cell blocks and configured to connect one or more of the cell blocks selectively in parallel or series. A cell block within the plurality of cell blocks may be selectively isolated from each other cell block within the plurality of cell blocks using the circuit. The cell block within the plurality of cell blocks may include a series connected string of battery cells. The cell block within the plurality of cell blocks may include parallel connected battery cells.

Abstract: A biological aerosol detector is provided. The biological aerosol detector uses a semiconductor optical source with an ultraviolet emission band to excite biological molecules in an aerosol sample. Filtering optics are configured to attenuate radiation from a secondary emission band of the optical source to prevent false signals due to scattering of secondary emission band radiation from non-biological molecules. An intake/exhaust manifold that includes an intake pipe that fits within a concentric exhaust pipe is also provided. The intake/exhaust manifold planarizes the flow of the sampled aerosol to maximize the time of irradiation. An electrostatic sampling grid is also provided to selectively draw biological molecules having a net charge into the optical chamber.

Abstract: A method for generating a synthetic data signal is described. A synthetic data signal having any desired duration is generated from a data signal and a background signal of shorter duration. The duration of the background signal is extended by sampling the background signal at random times and for random durations. The sampled background signal is used to extend the background signal. Event data is identified from the data signal. The extended background signal is randomly populated with event data randomly sampled from the data signal to generate the synthetic data signal.