Abstract: A method of operating a media scanner to protect a target machine from malware on a removable storage device is disclosed. The target machine and the removable storage device each include a respective data line, and the media scanner comprises a data switch. Data is scanned on the removable storage device with malware detection software of the media scanner via a first data path, the first data path comprising the data line of the removable storage device connected to the data line of the media scanner by the data switch in a first switching state. After the data has been scanned with the malware detection software, the data switch is operated to switch from the first switching state to a second switching state, thereby disconnecting the data line of the removable storage device from the data line of the media scanner and connecting the data line of the removable storage device to the data line of the target machine.

Abstract: The present disclosure provides a system for printing a three-dimensional object. The system may comprise a support for holding a portion of the object and a wire(s) source configured to hold a wire(s) of substantially the same or different diameters. The system may also comprise a print head. The print head may comprise a guide for directing the wire to the support. The system may also comprise a driver roller comprising a groove configured to contact a portion of the wire and direct the wire to the guide, and a power source in electrical communication with the wire and the support. The system may also comprise a controller configured to direct the power source to supply electrical current to the wire and the support. The electrical current may be sufficient to melt the wire when the wire is in contact with the support or the portion of the object.

Abstract: A method for stripping a III-V semiconductor layer epitaxially grown on a semiconductor wafer, and the semiconductor wafer is designed as a substrate and has an upper side, a buffer layer and the semiconductor layer being formed on the upper side, and a carrier layer being formed above the semiconductor layer, and the sacrificial layer having a higher wet chemical etching rate compared to the semiconductor layer, the semiconductor layer being introduced into a receiving device in a process step, and position data of points arranged on the upper side being read out from a memory device in a process step, and a laser approaching the points based on the position data in a process step, and holes having a base being produced through the carrier layer and the layer formed beneath the carrier layer via the laser, the base of the hole being formed within the buffer layer.

Abstract: An exemplary method for determining a total electron content of a portion of the ionosphere includes: transmitting from a satellite in orbit, a first signal at a first frequency and a second signal at a second frequency different from the first frequency toward a reflective surface through the portion of the ionosphere, wherein the first and second frequencies are in the very high frequency (VHF) range; receiving at the satellite, a reflection of the first signal and a reflection the second signal; determining a first delay of the reflection of the first signal and a second delay of the reflection of the second signal; and determining at least a first total electron content of the portion of the ionosphere based the first delay and the second delay.

Abstract: A ground-based node of a satellite system operates by: communicating control data with LEO navigation satellites in LEO around the earth; transmitting corrections data to the LEO navigation satellites; receiving a first collection of observations based on signaling from non-LEO navigation satellites in non-LEO around the earth, the signaling including collected observations from the non-LEO navigation satellites; receiving a second collection of observations based on navigation messages from the LEO navigation satellites, wherein the navigation messages facilitate client devices to determine their enhanced position when received in conjunction with second signaling from the non-LEO navigation satellites, and wherein the navigation messages are generated by the LEO navigation satellites in response to the corrections data; updating the corrections data based on the first collection of observations, the second collection of observations and based on telemetry data corresponding to the LEO navigation satellites

Abstract: Methods and systems for the laser surface treatment on stainless steel alloys and nickel alloys may include a computer may be programmed to set a laser path corresponding to a predetermined geometric pattern. A laser may be coupled to the computer and apply a pulsed laser beam to a contact surface of the substrate along the predefined geometric pattern. The pulsed laser beam may have a laser power between 0.1 W and 100 W, single pulse fluence 1 mJ/mm2 and 1025 mJ/mm2 and a laser speed between 25.4 cm/s and 127 cm/s. The laser may generate an open pore oxide layer on the contact surface of the substrate with a thickness of 0.1-1 ?m, an open pore distance of 0.05-1 ?m. The open pore oxide layer may have a topography corresponding to the predefined geometric pattern. The topography may contain open pore structures and promote adhesive bond performance.

Abstract: Optical Fast Fourier Transforms are described for use in photonic beamforming systems. Transmit and Receive photonic beamforming systems for use with active array antennas are described, together with digital and photonic payloads for use with such beamforming systems.

Abstract: A modem is configurable on a satellite, user terminal or gateway generates a radio frequency (RF) signal using an orthogonal frequency division multiplexing (OFDM) protocol including a radio frame including one or more bursts. A burst of the one or more bursts includes a first portion including burst detection data, a second portion including channel characteristic estimation data, a third portion including payload data, and fourth and fifth portions including pilot data. The first portion in a time domain is included in the burst prior to the second, third, fourth, and fifth portions. The first portion can include a pseudo-random noise sequence inserted in the time domain. The same physical modem can be configured to transmit signals on an uplink or downlink between a user terminal and a satellite or on the uplink or downlink between the satellite and the gateway.

Abstract: A three-dimensional print head apparatus comprising a hopper, a nozzle, a barrel, a heating system, a fume extraction system, a dry air purge system, and an agitator. The hopper may having a cavity and may have a lower aperture. The nozzle may have an upper aperture and may have a lower aperture. The heating system may be positioned along at least a portion of the barrel, which may defined a heated zone of the barrel. The dry air purge system may be in fluid communication with the hopper. The agitator may have at least one paddle.

Abstract: An indoor design scheme acquisition method and apparatus, a computer device and a storage medium are provided. The method includes: acquiring basic information of a target room, the basic information at least including house structure information; controlling a layout of articles in the target room based on the basic information of the target room to generate at least one design scheme of the target room, the design scheme including the house structure information and article placement information; acquiring scores of the design schemes based on the house structure information and the article placement information; and determining the design scheme meeting a preset requirement as a target design scheme based on the scores of the design schemes. The method can adapt to design requirements of different scenarios and different house structures, and the design scheme meeting a preset requirement is determined by scoring all the design schemes.

Abstract: Light emitters are optically isolated from each other by a high opacity filler, resulting in a large percentage of the emitted light passing through the polarizers. Ideally, that arrangement causes all of the light from the light emitters to either be absorbed by the high opacity filler material, or pass up through an optional diffuser, a polarizer, and then through a low opacity coating that serves to protect the polarizers. In practice, at least 45% of light passing out of the device passes through a polarizer, more preferably at least 75% or even at least 90% of light passing out of the device passes through a polarizer. A diffuser is included under the polarizer.

Abstract: A method for forging a niobium-tungsten alloy forged ring, including: (S1) subjecting an alloy ingot to turning, chamfering, spraying with an anti-oxidation coating, stainless-steel sheathing, heating and upsetting to obtain a primary pancake with a flat-die hammer, rapid-forging press or hydraulic press; (S2) subjecting an inner pole to wire electrical discharge machining to obtain a ring blank followed by machining to remove the stainless-steel sheath and oxide scale and defects; and subjecting the ring blank to fluorescent/dye penetrant inspection followed by vacuum stress-relief annealing; (S3) subjecting the ring blank to core shaft/saddle forging on the flat-die hammer or rapid-forging press to obtain a crude forged ring; and (S4) subjecting the crude forged ring to vacuum recrystallization annealing to obtain a desired forged ring.

Abstract: The present disclosure provides methods and systems for three-dimensional (3D) printing. In an example, a system and method for maintaining a command history in 3D printing software is disclosed. In an example, a method for updating a plurality of printing instructions comprises maintaining a plurality of printing states corresponding to the plurality of printing instructions, wherein a first state corresponds to a first set of printing instructions for printing a first portion of a 3D object. The plurality of printing states may comprise a final state comprising final printing instructions. User instructions may be received to select a second state that is not the final state. A new state may be generated comprising a second set of printing instructions for printing second portion of the 3D object. The plurality of printing instructions may be updated with the second set of printing instructions to yield an updated plurality of printing instructions.

Abstract: Cryogenic sources can be used for shielding in wire-based additive manufacturing. Cryogenic shielding can provide better shielding during print, as well as more efficient cooling compared to using regular room temperature shielding gas. Cryogenic shielding can extend the nozzle run time by preventing spatter build up in nozzles. Cryogenic sources also can be used for active part cooling and/or active weld puddle cooling.

Abstract: A method for orbit control of a satellite in orbit around the Earth and for desaturation of an angular momentum storage device of satellite is disclosed having two articulated arms each supporting a propulsion unit. The method includes determining a maneuver plan having at least two thrust maneuvers, a first thrust maneuver to be executed using the propulsion unit of one of the articulated arms and a second thrust maneuver to be executed using the propulsion unit of the other articulated arm, controlling the articulated arms and the propulsion units according to the maneuver plan, at least one of the first and second thrust maneuvers being a thrust maneuver referred to as discontinuous, composed of at least two separate consecutive thrust sub-maneuvers.

Abstract: A bearing assembly for stabilizing rotation of a rotatable element includes a gas bearing acting as a bearing for the rotatable element. An ultrasonic vibration pump is coupled to the gas bearing for providing pressurized gas to the gas bearing, and a sealed housing encloses the gas bearing and the ultrasonic vibration pump. Also described is a reaction wheel assembly for a spacecraft. The reaction wheel assembly includes a reaction wheel and the bearing assembly for stabilizing rotation of the reaction wheel.

Abstract: The invention relates to a screening device and a method for screening powders. The device comprises a screening space comprising a first chamber and a second chamber, which chambers are arranged adjacent and have a common partition wall. The device comprises a screen which is placed obliquely or vertically in the screening device, wherein the screen forms at least a part of the common partition wall. The first chamber comprises a raw material inlet, a drive gas inlet, a float gas unit, and a residual particle outlet. The second chamber comprises a product material outlet and a rotatable blade, wherein the blade comprises nozzles which are configured for blowing gas against the screen. In addition, the invention relates to an assembly comprising a first and second screening device, wherein the product material outlet of a first screening device is connected to the raw material inlet of the second screening device.

Abstract: Systems and methods for three-dimensional printing using microwave assisted deposition are disclosed herein. An example device includes a reservoir of carbonaceous nanocomposite thermoset, a microwave resonance cavity that cures the carbonaceous nanocomposite thermoset, and a sensor to measure the extrusion temperature of the resin when curing the carbonaceous nanocomposite thermoset at the point of deposition during extrusion-based 3D printing.

Abstract: A method for assembling devices on a satellite structure is disclosed including attaching the devices to a first face of a plate drilled with a through-hole provided with a fluid connector, on a second face of the plate, depositing a continuous peripheral bead of polymerisable adhesive composition and depositing a plurality of discontinuous and disjointed inner beads of polymerisable adhesive composition, pressing the second face of the plate against a continuous face of the structure, performing suction so as to create a pressure differential between the plate and the structure, at least partially polymerising the polymerisable adhesive compositions so as to form adhesive joints between the plate and the structure, and interrupting the suction.

Abstract: There is provided an video encoding/decoding method and apparatus. The video decoding method comprises acquiring a bitstream including a predetermined context element, performing at least one of a context model determination, a probability update, and a probability interval determination on the predetermined syntax element, and arithmetically decoding the predetermined syntax element on the basis of a result of the performance.