Abstract: The invention provides cathodoluminescent lamps with improved optical stability and extended lifetimes through advanced enclosure and electron emission configurations. A filament emits electrons via thermionic emission, which are accelerated by an anode toward a cathodoluminescent emitter to produce photons. The vacuum enclosure comprises glass, fused silica, and metal portions coupled with vacuum-compatible epoxy, with the metal providing thermal and electrical conduction. The lamp can include anode current monitoring and filament power control to stabilize emission. An electrically activated getter maintains vacuum conditions by chemically bonding contaminants and can be refreshed over time. The designs enable effective vacuum maintenance, stable operation, and long-term reliability suitable for commercial applications.

Abstract: A self-contained identification tag arranged to be attachable to a resident space object (RSO) comprising: a processor; an antenna, an energy gatherer arranged to gather energy from the environment; and an energy store arranged to receive and store energy from the energy harvester; wherein the processor is arranged to use energy stored in the energy store to transmit a radio-frequency (RF) identification signal via the antenna. A system for identifying space objects comprising: a radar arranged to determine the orbital path of a resident space object (RSO); and a receiver arranged to receive an identification signal from an identification tag attached to the RSO and to determine a tag identity; wherein the system is arranged to use the determined orbital path and the determined tag identity to determine the identity of the RSO.

Abstract: Some of such technologies enable a technique for calibrating a radar based on using -A- an elemental antenna, which can be embedded on a housing hosting a set of antenna elements, or -B- an antenna mounted to a reflector (108). Some of such technologies enable a radar site containing a first ID phased array (112) and a second ID phased array (112), where the first ID phased array sends a set of signals and receives a set of reflections based on the set of signals, and the second ID phased array receives the set of reflections.

Abstract: Some of such technologies enable a technique for calibrating a radar based on using—A—an elemental antenna, which can be embedded on a housing hosting a set of antenna elements, or—B—an antenna mounted to a reflector (108). Some of such technologies enable a radar site containing a first ID phased array (112) and a second ID phased array (112), where the first ID phased array sends a set of signals and receives a set of reflections based on the set of signals, and the second ID phased array receives the set of reflections.

Abstract: A cathodoluminescent lamp includes a filament configured to emit electrons responsive to a voltage applied across the filament, an anode configured to receive electrons emitted from the filament, an emitter comprising cathodoluminescent material, disposed in proximity to the anode, configured to emit photons responsive to stimulation from the electrons and a vacuum envelope configured to enclose the filament, anode, and emitter, and to maintain a vacuum over a path of the electrons. The filament comprises a smooth electron emitting surface. The cathodoluminescent material may comprise a semiconductor material.

Abstract: A method of determining tumbling characteristics of resident space objects includes acquiring a geometry of a target object, generating a distribution of radio scatterers within the geometry of the target, calculating multiple radar cross sections at different angles for the distribution, finding an autocorrelation for each radar cross section versus each angle, using the autocorrelations to find a decorrelation angle, extracting a decorrelation time from radar data of the object, and finding a rotation rate of the object as the tumbling characteristic.

Abstract: Various radar systems and methods may be capable of identifying and thereafter tracking objects, particularly objects not previously identified, moving in space through various combinations of incoherent processing of radar data, dynamic detection and modeling, and coherent and/or correlator processing. These radar systems and methods may do this without or while minimizing at least some computational expense that may be required by conventional radar systems and methods.

Abstract: Improved ultraviolet field-emission lamps can be safely deployed close to people because they eliminate the use of toxic materials, mitigate heating issues, and emit light in a wavelength range that is safe for human exposure.

Abstract: A method and system for performing clearance analysis of a product assembly in a computer-aided design (CAD) environment is disclosed. A method includes receiving a request for evaluating clearance between components of a product assembly in a CAD environment from a user device. The request includes a unique identifier of the product assembly. The method includes obtaining product data associated with the product assembly from a PDM database based on the unique identifier of the product assembly, and iteratively decomposing a product space including the product assembly in the CAD environment into a plurality of variable-sized partitions based on the product data. The method also includes selecting one or more variable-sized partitions for evaluating clearance between the components in the product assembly from the plurality of the variable-sized partitions, and evaluating clearance between the components in the selected variable-sized partitions.

Abstract: To produce hexagonal boron nitride (h-BN), boron and nitrogen are added to a metallic solvent in a crucible in a reaction chamber and heat-treated. In an absorption step, a first soak is performed at a first temperature that is high enough to cause absorption of the nitrogen and boron into the metallic solvent. In a nucleation step after the absorption step, the first temperature is rapidly reduced to a second temperature, and h-BN nuclei are formed in the metallic solvent. In a growth step after the nucleation step, a second soak is performed at the second temperature to grow the h-BN nuclei. After the growth step, the h-BN nuclei are separated from the metallic solvent.

Abstract: Improved ultraviolet field-emission lamps can be safely deployed close to people because they eliminate the use of toxic materials, mitigate heating issues, and emit light in a wavelength range that is safe for human exposure.

Abstract: Nanowire light emitting diodes (LEDs) are operable for spontaneous emission of light at significantly reduced current densities and with very narrow linewidths relative to conventional LEDs.

Abstract: Technologies for calibrating radars and tracking space objects. Some of such technologies enable a technique for calibrating a radar based on using -A- an elemental antenna (308), which can be embedded on a housing hosting a set of antenna elements, or -B- an antenna (146) mounted to a reflector. Some of such technologies enable a radar site containing a first 1D phased array (112) and a second 1D phased array (112), where the first 1D phased array sends a set of signals and receives a set of reflections based on the set of signals, and the second 1D phased array receives the set of reflections.

Abstract: Some of such technologies enable a technique for calibrating a radar based on using—A—an elemental antenna, which can be embedded on a housing hosting a set of antenna elements, or—B—an antenna mounted to a reflector (108). Some of such technologies enable a radar site containing a first ID phased array (112) and a second ID phased array (112), where the first ID phased array sends a set of signals and receives a set of reflections based on the set of signals, and the second ID phased array receives the set of reflections.

Abstract: Technologies for calibrating radars and tracking space objects. Some of such technologies enable a technique for calibrating a radar based on using -A- an elemental antenna (308), which can be embedded on a housing hosting a set of antenna elements, or -B- an antenna (146) mounted to a reflector. Some of such technologies enable a radar site containing a first 1D phased array (112) and a second 1D phased array (112), where the first 1D phased array sends a set of signals and receives a set of reflections based on the set of signals, and the second 1D phased array receives the set of reflections.

Abstract: Improved ultraviolet field-emission lamps can be safely deployed close to people because they eliminate the use of toxic materials, mitigate heating issues, and emit light in a wavelength range that is safe for human exposure.

Abstract: Improved ultraviolet field-emission lamps can be safely deployed close to people because they eliminate the use of toxic materials, mitigate heating issues, and emit light in a wavelength range that is safe for human exposure.

Abstract: A method of determining tumbling characteristics of resident space objects includes acquiring a geometry of a target object, generating a distribution of radio scatterers within the geometry of the target, calculating multiple radar cross sections at different angles for the distribution, finding an autocorrelation for each radar cross section versus each angle, using the autocorrelations to find a decorrelation angle, extracting a decorrelation time from radar data of the object, and finding a rotation rate of the object as the tumbling characteristic.

Abstract: Processes for synthesizing the hexagonal polymorph of boron nitride (h-BN) produce h-BN of a grade that is highly suitable for ultraviolet (UV) field-emission lights and other UV applications.

Abstract: Improved ultraviolet field-emission lamps can be safely deployed close to people because they eliminate the use of toxic materials, mitigate heating issues, and emit light in a wavelength range that is safe for human exposure.