Abstract: A microbial fuel cell comprising: an anode; an anode chamber configured to house the anode and an oxygen-reduced, nutrient-rich solution from a sediment bottom of a natural water body, wherein the anode chamber shields the anode from surrounding oxygen-rich water; a cathode disposed outside the anode chamber in the oxygen-rich water and electrically coupled in series to the anode via an electrical load; and an agitator configured to periodically agitate the sediment bottom to increase the quantity of nutrients in the nutrient-rich solution.

Abstract: An energy harvester comprising: a microbial fuel cell comprising an anode; and a pump comprising a flexible diaphragm that is configured to be flexed by an ambient, renewable energy source such that with each flexing of the diaphragm nutrient-rich media is pumped past the anode.

Abstract: An energy harvester comprising: a microbial fuel cell comprising an anode; and a pump comprising a flexible diaphragm that is configured to be flexed by an ambient, renewable energy source such that with each flexing of the diaphragm nutrient-rich media is pumped past the anode.

Abstract: A microbial fuel cell comprising: a first cathode; at least two anodes electrically connected to each other and to the cathode in a reconfigurable manner; and a processor operatively coupled to the anodes and configured to monitor a parameter of each anode to determine if a given anode has been oxygen-contaminated, and further configured to convert an oxygen-contaminated anode into a second cathode by reconfiguring the electrical connections.

Abstract: A marking template includes a flat body having a bottom edge and two slots perpendicular to the bottom edge. The slots guide movements of a fitting between extremes defined by the ends of the slots. The fitting includes a flat bottom edge and a triangular edge portion dividing the flat bottom edge into two spaced portions. The triangular edge portion defines a right angle and is designed to receive the corner of a door or drawer face to allow marking of holes from the perspective of the corner of the door or drawer face. The flat bottom edge allows placement of the inventive marking template along one of the side edges of a door or drawer face. In one embodiment of the present invention, a lower portion of the marking template includes a plurality of spaced holes along with various indicia marking the location of each hole as well as other locations on the bottom edge of the body.

Abstract: The present invention is a device for locating fastener positions and is more particularly concerned with the aspect of precise location for removal of material by boring or drilling by means of a hand held electric drill motor or drill press.

Abstract: A humidity sensor which varies in electrical impedance with variations in humidity in the atmosphere in which it is placed comprising a ceramic body, at least a pair of spaced electrodes disposed on said ceramic body in electrical contact therewith, and an electrical contact on each said electrode, said ceramic body being an electrolyte comprised of Na.sub.1+x Si.sub.x Zr.sub.2 P.sub.3-x O.sub.12, where x has a value ranging from 1.5 to 2.8, said ceramic body having a density of at least about 90% of the theoretical density for said Na.sub.1+x Si.sub.x Zr.sub.2 P.sub.3-x O.sub.12, each said electrode being in the form of a continuous interconnecting network which forms at least a sufficient plurality of non-linear recesses with the surface of the ceramic body exposing said ceramic body surface to said atmosphere to produce a measurable electrical impedance change when said atmosphere varies in relative humidity.