Abstract:
An aperture system for a bottom-up stereolithography device including a reservoir having a lower opening, an aperture including a flexible membrane positioned within the reservoir and covering the lower opening, and a boundary seal positioned around a periphery of the flexible membrane, the boundary seal including one or more boundary seal components and immobilizing the periphery of the flexible membrane against the reservoir. The flexible membrane is formed of a material having a low affinity for a liquid resin used in the stereolithography device as well as cured photopolymer resin parts produced by the device. In addition, the flexible membrane is able to deform as the cured resin part is pulled away from the aperture, thus enabling lower energy mixed mode adhesive failure to occur at the interface between the cured resin and the aperture and reducing the chance of cohesive damage to the cured photopolymer part.
Abstract:
A field-effect transistor includes an n-type gallium oxide substrate having a first doping concentration; an n-type gallium oxide drift layer on a first side of the substrate and having a second doping concentration smaller than the first doping concentration, a p-type Ill-nitride first base layer on the drift layer, and an n-type Ill- nitride source layer on the first base layer and having a third doping concentration larger than the second doping concentration. A method of forming the field-effect transistor includes providing an n-type gallium oxide drift layer having a first doping concentration on a first side of an n-type gallium oxide substrate having a second doping concentration larger than the first doping concentration, forming a p-type Ill- nitride first base layer on the drift layer, and forming an n-type Ill-nitride source layer on the first base layer and having a third doping concentration larger than the first doping concentration.
Abstract:
A system for providing wireless connections in configuring an instrument or microphone with audio effects, effects pedal boards, mixers, and other studio equipment. The signal from an audio source such as an instrument or microphone is connected to a main unit, from which it is transmitted via wireless link to a floor unit connected to one or more effects pedals or other studio equipment. After processing, the audio signal is returned via wireless link to the main unit and then routed to an amplifier.
Abstract:
A method and apparatus for an ultra-high sensitivity, low cost, passive (no battery) low-power energy harvesting data transmitting circuit energy, such as a RFID (Radio Frequency IDentification) tag integrated circuit "chip." By using combinations of special purpose design enhancements, the low-power energy harvesting passive data transmitting circuit, such as the RFID tag chip, operates in the sub-microwatt power range. The chip power should be derived from a low-microwatt per square centimeter RF field radiated to the RFID tag antenna from the tag reader (interrogator) or derived from a suitable low signal source, such as a sonic transducer (e.g., a piezoelectric transducer or a low level DC source, such as a bi-metallic or chemical source).
Abstract:
A thermal and environmental barrier coating composed of ceramic hollow microspheres sintered together. In one embodiment the microspheres are sintered together with a powder of another material that acts as a binder, or with a powder of a material that may be the same as the material of the hollow microspheres, forming a matrix in which the hollow microspheres are embedded. The hollow microspheres may be composed of a material with a high temperature capability, and with a low coefficient of thermal expansion.
Abstract:
Architected materials with superior energy absorption properties when loaded in compression. In several embodiments such materials are formed from micro-truss structures composed of interpenetrating tubes in a volume between a first surface and a second surface. The stress-strain response of these structures, for compressive loads applied to the two surfaces, is tailored by arranging for some but not all of the tubes to extend to both surfaces, adjusting the number of layers of repeated unit cells in the structure, arranging for the nodes to be offset from alignment along lines normal to the surfaces, or including multiple interlocking micro-truss structures.
Abstract:
A three-dimensional lattice architecture with a thickness hierarchy includes a first surface and a second surface separated from each other with a distance therebetween defining a thickness of the three-dimensional lattice architecture; a plurality of angled struts extending along a plurality of directions between the first surface and the second surface; a plurality of nodes connecting the plurality of angled struts with one another forming a plurality of unit cells. At least a portion of the plurality of angled struts are internally terminated along the thickness direction of the lattice structure and providing a plurality of internal degrees of freedom towards the first or second surface of the lattice architecture.
Abstract:
A slot waveguide utilized as a color-selecting element. The slot waveguide includes a first layer of plasmon supporting material, the first layer being optically opaque and having an input slit extending through the first layer; a second layer of plasmon supporting material facing the first layer and separated from the first layer by a first distance in a first direction, the second layer being optically opaque and having an output slit extending through the second layer and separated from the input slit by a second distance extending along a second direction differing from first direction; a dielectric layer interposed between the first layer and the second layer, the dielectric layer having a real or complex refractive index; and a power source electrically coupled to the first layer and the second layer to apply an electrical signal for modulation of the real or complex refractive index of the dielectric layer.
Abstract:
Printed circuit boards have circuit layers with one or more copper filled through-holes and methods of manufacturing the same. An aspect of an embodiment of the present invention enhances thermal characteristics of filled through-holes of printed circuit boards to provide extra reliability to the printed circuit boards. In one embodiment, a printed circuit broad has a plurality of through-holes to connect copper patterns on different layers of the printed circuits broad. Here, at least one of the through-holes is copper plated closed at both ends with at least 70% volume of the through-hole plated with copper to, e.g., enhance thermal characteristics of the through-hole, thereby providing extra reliability to the printed circuit board. In one embodiment, the printed circuit board includes a surface conductor (or cap) that is directly plated over the copper filled barrel plated through-hole.
Abstract:
A method and system for controlling a vehicle given to a third party. The system includes a system controller; a mode-indicating device coupled to the system controller; and an authenticator coupled to the system controller. Here, the system controller is adapted to communicate a driving restriction to the vehicle upon an activation of the mode-indicating device by an authorized driver and until a deactivation of the mode-indicating device by the authorized driver, the system controller is adapted to restrict the activation and the deactivation of the mode-indicating device unless the authorized driver has been authenticated by the authenticator, and the driving restriction includes a limit selected from the group consisting of a limit in number of starts, a limit in speed, a limit in acceleration, a limit in number of minutes, a limit in distance, a limit in gears, a limit in locations, and combinations thereof.