HRL Laboratories , was the research arm of Hughes Aircraft. It is a dedicated research center, established in 1960, in Malibu. Currently owned by General Motors Corporation and Boeing, the research facility is housed in two large, white multi-story buildings overlooking the Pacific Ocean. Wikipedia.
HRL Laboratories | Date: 2016-02-26
A half bridge circuit includes a sapphire substrate, a GaN upper switch on the sapphire substrate, a GaN lower switch on the sapphire substrate and coupled to the GaN upper switch, a first conductor coupled to the upper switch, a second conductor coupled to the lower switch, and a capacitor. A portion of the first conductor and a portion of the second conductor are on a plane vertically separated from the upper switch and the lower switch by a height, and the capacitor is coupled between the portion of the first conductor and the portion of the second conductor.
HRL Laboratories | Date: 2016-09-30
Several embodiments are disclosed that provide for a frequency selective surface that can be placed like a radome on top of or under an existing radome or as a new radome on top of one or more radiating or receiving apertures or antennas to provide for a high-Q filter function to remove unwanted neighboring frequency interferences. The conformal structure comprises of an array of subwavelength electrically connected broken metallic rings and/or broken wires loaded with electromechanical resonators such as quartz or LiNbO_(3 )crystal resonators, Bulk Acoustic Wave (BAW) resonators, and/or Surface Acoustic Wave (SAW) resonators at said breaks. When excited by an incident electromagnetic wave this collection of loaded rings and/or wires behaves as a filter which is capable of rejecting and/or passing frequencies over a narrow bandwidth. This medium can be formed into conformal shapes which can be placed over antennas and apertures as a frequency selective material, to introduce these frequency characteristics into the radiation pattern of the antenna, thereby reducing the gain of the antenna very sharply near the outside edges of the intended operating band. By loading the elements of this FSS with capacitors and/or inductors, additional spectral features can be added to the frequency response of the material to introduce broad pass and reject bands, to enable additional design flexibility for shared apertures. These reject or pass bands are significantly more narrow than achievable with traditional LC loaded FSS structures.
HRL Laboratories | Date: 2016-11-15
Variations of this invention provide durable, impact-resistant structural coatings that have both dewetting and anti-icing properties. The coatings in some embodiments possess a self-similar structure that combines a low-cost matrix with two feature sizes that are tuned to affect the wetting of water and freezing of water on the surface. Dewetting and anti-icing performance is simultaneously achieved in a structural coating comprising multiple layers, wherein each layer includes (a) a continuous matrix; (b) discrete templates dispersed that promote surface roughness to inhibit wetting of water; and (c) nanoparticles that inhibit heterogeneous nucleation of water. These structural coatings utilize low-cost, lightweight, and environmentally benign materials that can be rapidly sprayed over large areas using convenient coating processes. The presence of multiple layers means that if the surface is damaged during use, freshly exposed surface will expose a coating identical to that which was removed, for extended lifetime.
HRL Laboratories | Date: 2017-05-03
A chip-scale scanning lidar includes a two dimensional (2D) scanning micromirror for a transmit beam and a 2D scanning micromirror for a receive beam, a laser diode and a photodetector, a first waveguide and first grating outcoupler coupled to a front facet of the laser diode, a second waveguide and a second grating outcoupler coupled to a rear facet of the laser diode on a substrate. A first fixed micromirror, a second micromirror, a third micromirror, and a focusing component are in a dielectric layer bonded to the substrate over the laser diode and photodetector. The photodetector is optically coupled to the second fixed micromirror and the third fixed micromirror for coherent detection.
HRL Laboratories | Date: 2016-12-28
Described is a disease prediction system using open source data. The system includes a preprocessing module, a learning module, and a prediction module. The preprocessing module receives a dataset of N trend results related to a disease event and generates an enhanced filter signal (EFS) curve related to the disease event. The learning module receives the EFS curve and generates a predicted number of cases of the disease e vent and, using a plurality of machine learning methods, generates a plurality of predictions that the disease event will happen within a future time period. The prediction module determines precision and recall for each of the plurality of predictions and, based on the precision and recall, provides a likelihood that the disease event will occur.
HRL Laboratories | Date: 2016-11-07
A field effect transistor (FET) includes a III-nitride channel layer, a III-nitride barrier layer on the channel layer, a first dielectric on the barrier layer, a first gate trench extending through the first dielectric, and partially or entirely through the barrier layer, a second dielectric on a bottom and walls of the first gate trench, a source electrode on a first side of the first gate trench, a drain electrode on a second side of the first gate trench opposite the first side, a first gate electrode on the second dielectric and filling the first gate trench, a third dielectric between the first gate trench and the drain electrode, a second gate trench extending through the third dielectric and laterally located between the first gate trench and the drain electrode, and a second gate electrode filling the second gate trench.
HRL Laboratories | Date: 2017-02-22
Described is system for generation of elliptic curve digital signature algorithm (ECDSA) based digital signatures. A. Secret-Share protocol is initialized between a client and a set of servers to share a set of shares of a private key s among the set of servers. The set of servers initializes a protocol to generate a digital signature on a message using the set of shares of the private key s without reconstructing or revealing the private key A. The set of servers periodically initialises a Secret-Redistribute protocol on each share of the private key A- to re- randomize the set of shares. A Secret-Open protocol is initialized to reveal the private key s to an intended recipient, wherein the private key A is used to compute the digital signature.
HRL Laboratories | Date: 2016-12-27
We have demonstrated reversibly reducing metal-ion crosslinkages in polymer systems, by harnessing light, creating a dynamic and reversible bond. The reduction induces chemical and physical changes in the polymer materials. Some variations provide a polymer composition comprising: a polymer matrix containing one or more ionic species; one or more photosensitizers; and one or more metal ions capable of reversibly changing from a first oxidation state to a second oxidation state when in the presence of the photosensitizers and light. Some embodiments employ urethane-based ionomers capable of changing their crosslinked state under the influence of a change in counterion valance, using light or chemical reducing agents. This invention provides films, coatings, or objects that are reversible, re-mendable, self-healing, mechanically adjustable, and/or thermoplastic/thermoset-switchable.
HRL Laboratories | Date: 2017-06-21
A sandwich material having both structural strength and significant acoustic attenuation. In one embodiment, a sandwich is composed of an architected core secured between two facesheets, with a compliant layer forming the connection between the core and the facesheets. The compliant core has a low modulus, resulting in a low speed for elastic shear waves in the sandwich, at low static loads. At high static loads the compliant material stiffens and allows the sandwich to exhibit significant structural strength.
HRL Laboratories | Date: 2017-05-31
Described is a system for data classification using formal concept analysis (FCA). In a training phase, the system generates a FCA classification lattice, having a structure, using a set of training data. The set of training data comprises training presentations and classifications corresponding to the training presentations, in a classification phase, a set of test data having classes that are hierarchical in nature is classified using the structure of the FCA classification lattice.