Abstract: A tunable Q resonator using a capacitive-piezoelectric transducer provides a flexible top electrode above an AlN resonator. The top electrode can be pulled electrostatically towards the resonator and substrate, forming a frictional contact with either the resonator or the combined resonator-electrode structure to the substrate, allowing for electrical tuning the Q of the resonator. With a sufficient electrostatic bias voltage Vb, the resonator may be completely turned OFF, allowing for an integrated switchable AlN resonator. Such switchable resonator may be integrated into a radio frequency (RF) front end as a digitally selectable band pass filter element, obviating the need for ancillary micromechanical switches in the signal path. The device has been demonstrated with a Q approaching 9,000, together with ON/OFF switchability and electromechanical coupling up to 0.63%.

Abstract: A tunable Q resonator using a capacitive-piezoelectric transducer provides a flexible top electrode above an AlN resonator. The top electrode can be pulled electrostatically towards the resonator and substrate, forming a frictional contact with either the resonator or the combined resonator-electrode structure to the substrate, allowing for electrical tuning the Q of the resonator. With a sufficient electrostatic bias voltage Vb, the resonator may be completely turned OFF, allowing for an integrated switchable AlN resonator. Such switchable resonator may be integrated into a radio frequency (RF) front end as a digitally selectable band pass filter element, obviating the need for ancillary micromechanical switches in the signal path. The device has been demonstrated with a Q approaching 9,000, together with ON/OFF switchability and electromechanical coupling up to 0.63%.

Abstract: Refractory furnace covers and methods for their construction are provided. A method includes providing a molding form base having a molding surface, providing an outer molding frame on the molding form base, and providing at least one inner molding member disposed across and dividing the molding surface into a first molding section and a second molding section. The inner molding member has a first molding surface and a second molding surface located adjacent to and facing the first and second molding sections, respectively, the inner molding member having a protrusion located along the length of the first molding surface. A first molded section of the furnace cover is cast between the outer molding frame and the first molding surface of the inner molding member, the inner molding member is removed, and a second molded section of the furnace cover is cast between the outer molding frame and the first molded section of the furnace cover.

Abstract: The present invention is directed to a portable oxygen concentrator system adapted to be transported by a user. The portable oxygen concentrator system includes an energy source, an air separation device powered by the energy source and adapted to convert ambient air into concentrated oxygen gas for the user, at least one sensor adapted to sense one or more conditions indicative of the oxygen gas needs of the user, and a control unit interrelated with the air separation device and the at least one sensor to control the air separation device so as to supply an amount of oxygen gas equivalent to the oxygen gas needs of the user based at least in part upon the one or more conditions sensed by the at least one sensor.

Abstract: The present invention is directed to a portable oxygen concentrator system adapted to be transported by a user. The portable oxygen concentrator system includes an energy source, an air separation device powered by the energy source and adapted to convert ambient air into concentrated oxygen gas for the user, at least one sensor adapted to sense one or more conditions indicative of the oxygen gas needs of the user, and a control unit interrelated with the air separation device and the at least one sensor to control the air separation device so as to supply an amount of oxygen gas equivalent to the oxygen gas needs of the user based at least in part upon the one or more conditions sensed by the at least one sensor.

Abstract: The present invention is directed to a portable oxygen concentrator system adapted to be transported by a user. The portable oxygen concentrator system includes an energy source, an air separation device powered by the energy source and adapted to convert ambient air into concentrated oxygen gas for the user, at least one sensor adapted to sense one or more conditions indicative of the oxygen gas needs of the user, and a control unit interrelated with the air separation device and the at least one sensor to control the air separation device so as to supply an amount of oxygen gas equivalent to the oxygen gas needs of the user based at least in part upon the one or more conditions sensed by the at least one sensor.

Abstract: A portable radial drill press including a base member that has a columnar support with a balance retention member. The columnar support has a first axial bore and a back side with a slit. Included is a traveling block has a rear support with a second axial bore and forked members. A columnar member is positioned within the first axial bore of the base member. The columnar member has a top end that passes into the second axial bore of the traveling block. The columnar member has a bottom portion secured within the first axial bore with a clamping bolt. A left hand feed screw is positioned within the columnar member and engaged by a feed nut screw. The feed nut screw is held about the feed screw by a first bolt and a flat screw. The first bolt passes between the fork members to engage the feed nut screw. The flat screw passes through the rear support to engage the feed nut screw. Lastly, a drill support arm with an elongated opening coupling the traveling block and large opening supporting a hand drill.

Abstract: An electrical apparatus protective interconnect module including a casing having therein a chamber at one end and a socket at the other end for receiving within the socket an electrical apparatus having controls. A power supply is contained within the chamber and provide power to the electrical apparatus received within the socket. Connectors are located between the chamber and the socket for coupling the power supply to the electrical apparatus received within the socket. The casing encloses and restricts access to predetermined controls of the electrical apparatus received within the socket. The module further comprises externally accessible outputs for coupling an electrical signal output of the electrical apparatus, received within the socket, from the casing to external electrodes.

Abstract: A solenoid device for treatment of body tissue such as bones or other regions with pulsed signals comprises a flexible flat belt for encircling a body part or cast surrounding a body part containing tissue to be treated. The belt has a plurality of parallel conductors extending along its length and has its opposite ends offset by one or more conductor spacings. The resultant aligned conductor ends are connected together to form at least one continuous coil, with the resultant unconnected outer conductor ends at opposite sides of the belt comprising inputs across which a suitable electrical signal can be connected. An adjustment device or buckle is mounted on the belt to allow the diameter of the belt to be adjusted. The buckle traps a doubled over portion of the belt circumference which is adjustable in length to change the diameter of the device to closely fit the underlying body part or cast.

Abstract: Precision-lapped pieces of ceramic and ferrite are stacked together with pieces of ceramic-convertible glass. Firing of the stack causes the glass to devitrify and results in a comb-less track array assembly having precise track and track-to-track dimensions. The assembly is then processed to form part of a magnetic record and/or reproduce head.