Abstract: A low-cost infrasound sensor comprising a main body, a pressure port with a sensing element, a printed circuit board, a transmitter, and a means for elevating the main body above the ground such that when the infrasound sensor is placed upright, the sensing element is located at most 1 centimeter above the ground surface. Also, an array of said low-cost infrasound sensors. A method of using said infrasound sensor, comprising measuring the pressure at most 1 centimeter above the ground surface. Optionally, using a differential GPS unit and a differential GPS sensor along with scannable labels to create a deployment map of an array of said infrasound sensors. Optionally, using low-cost oscillators in the infrasound sensors and a single GPS clock to synchronize the low-cost oscillators. Optionally, using a hierarchal data structure with varying nodes to save power while transmitting data from the infrasound sensors to a central computer.

Abstract: A man-portable dialysate generator with a forward osmosis membrane module, a concentrated aqueous salt solution reservoir, a non-sterile water feedstock inlet, and a collection reservoir that produces sterile dialysate from non-sterile feed water. The dialysate generator does not have an electric-powered pump to move fluids across the osmosis membrane, or does not have electric-powered pumps that generate more than 5 psi for fluid pressure. The dialysate generator is man-portable, less than 50 pounds and maybe less than 31 pounds, and preferably less than 10 pounds. The device is particularly advantageous for use in forward deployed military patient care, disaster response or remote medical care situations away from clean water and electricity.

Abstract: A portable enclosure includes a bottom component including a first sidewall that forms a first door opening. The portable enclosure further includes a top component including a second sidewall that forms a second door opening. The top component is configured to removably attach to the bottom component to align the first door opening and the second door opening and to at least partially enclose an interior volume of the portable enclosure. The portable enclosure further includes a door configured to removably attach to the top component and the bottom component to cover the first door opening and the second door opening.

Abstract: A portable enclosure includes a bottom component including a first sidewall that forms a first door opening. The portable enclosure further includes a top component including a second sidewall that forms a second door opening. The top component is configured to removably attach to the bottom component to align the first door opening and the second door opening and to at least partially enclose an interior volume of the portable enclosure. The portable enclosure further includes a door configured to removably attach to the top component and the bottom component to cover the first door opening and the second door opening.