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 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: 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 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: 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.

Abstract: A fully-reconfigurable coaxial filter is provided that includes coaxial resonators mounted such that both opposite ends are coupleable to corresponding tuners, first tuners made of dielectric material, each first tuner being slidably mounted at a first end of a corresponding coaxial resonator to be movable relative to the first end to form a dielectric of a capacitive load, and second tuners made of dielectric material, each second tuner being slidably mounted at a second end of a corresponding coaxial resonator to be movable relative to the second end to form a dielectric of a capacitive load associated with the second end of the corresponding coaxial resonator. The first and second tuners are movable relative to the corresponding coaxial resonator so as to tune the capacitive loads associated with the opposite ends of the coaxial resonator and, resultingly, a resonant frequency and mutual coupling coefficient of the coaxial resonator.

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: Various embodiments of a vortex hybrid motor are described herein. In some embodiments, the vortex hybrid motor may include a combustion zone defined by a fuel core and/or motor housing. The combustion zone may include an upper zone and a central zone that each contribute to thrust created by the vortex hybrid motor. In some embodiments, an injection port configuration is described that includes a proximal injection port that may be controlled for modulating a delivery of an amount of oxidizer for adjusting an oxidizer-to-fuel ratio. In some embodiments, a fuel core configuration is described that provides radially varying gradients of fuel in order to achieve desired thrust profiles. In some embodiments, the fuel core may include a support structure and/or a proximal end of a nozzle of the vortex hybrid motor may extend into the fuel core.

Abstract: The present invention discloses an adjustable holographic metamaterial antenna structure, wherein the structure comprises: a surface waveguide feed network configured to connect to a power dividing network; a varactor diode bias circuit configured to comprise a direct current bias circuit and a plurality of varactor diodes associated with the direct current bias circuit; and a metamaterial surface arranged above the direct current bias circuit, and the metamaterial surface and the direct current bias circuit are connected through a bias via hole; wherein the metamaterial surface and the direct current bias circuit separately perform direct current bias feeding on each of the varactor diodes, and an interference pattern of the metamaterial surface is changed to achieve scanning of a radiation pattern. The present invention solves the problems that a two-dimensional feed network layout of a holographic-metamaterial antenna is difficult and is easy to interfere with radio frequency signals.

Abstract: Described herein are systems, methods, media, and devices for generating a satellite program for contacting satellites. In some embodiments, data including one or more targets for accessing a satellite constellation is obtained. Based on the data, a set of representations may be generated and candidate satellite constellation access programs may be determined based on the set of representations. For each program, a first score may be computed for each target to obtain a first set of scores, and a second score may be computed for each first score of the first set of scores to obtain a second set of scores. A satellite constellation access program may be selected from the candidate satellite access programs based on the second set of second scores.

Abstract: Protection of space solar cells in an arrangement in the form of a string extending in an X direction, and two directly adjacent space solar cells in the X direction in each case are electrically connected to each other in series with the aid of a metallic connector. The string has a first end and a second end opposite the first end, and a protection arrangement formed along a Y direction is formed on one of the two ends. The protection arrangement has a first string protection diode formed in the Y direction and a metal strip and a second string protection diode. The protection arrangement is electrically connected to one of the two ends of the string and each string protection diode is uncased and has exactly one metal contact on the upper side and exactly one metal contact on the underside.

Abstract: A medical fluid injector S100 includes a medical fluid bag holder 10 that holds a medical fluid bag B containing a medical fluid, a mounting supporter 20 that supports the medical fluid bag holder 10 and in which is formed an attachment portion 22 for attaching the medical fluid bag holder 10 to a part of the body of the subject, and an elastic member 30 that is a pressurizing means for pushing out the medical fluid from the medical fluid bag B by applying pressure to the medical fluid bag B.

Abstract: A fluid tank for integration into a structure of an unmanned aircraft includes a shell having a first axial wall, an oppositely arranged second axial wall, an upper side, a lower side, and an enclosed interior, at least one receiving chamber in the interior for storing fluid, and a collection chamber, which is arranged on the lower side and which is fluidically connected to the at least one receiving chamber. The collection chamber includes a bottom surface, through which there extends a drain, wherein a covering surface is arranged above the bottom surface and covers at least a portion of the collection chamber. At least one flow opening could be arranged on an upper side of the collection chamber, which flow opening allows gas bubbles to escape in the direction of the upper side of the fluid tank.

Abstract: Embodiments of the present disclosure are directed to techniques for transitioning a spacecraft from a power-saving state to a power-consuming state at a time after launch of the spacecraft on a launch vehicle. Because the spacecraft can detect conditions for transitioning to the power-consuming state, commands received via an umbilical connection to the launch vehicle, or detecting the presence or absence of such a connection, is unnecessary, thereby removing several technical barriers to eliminating such umbilical connections altogether.

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: Provided are a method for sharing a radio spectrum with high-orbit communication satellites, which comprise a geosynchronous satellite and operate in a near-equatorial orbit, on the basis of a beam constant offset, and a low-orbit communication satellite system.

Abstract: The present invention provides systems, and methods for manufacturing polarized light emitting semiconductor packages, comprising the disposition of a first bonding solution about (a) a first light emitting element and (b) a first polarizing element, wherein the first polarizing element transmits linearly polarized light in a first directionality. A first energy is applied to polymerize the first bonding solution, thereby encapsulating the first polarizing element and a first light emitting element in a first semiconductor package. A second bonding solution is disposed about (a) a second light emitting element and (b) a second polarizing element, wherein the second polarizing element transmits polarized light in a second directionality different from the first directionality, and a second energy is applied to polymerize the second bonding solution, thereby encapsulating the second polarizing element and the second light emitting element in a second semiconductor package.

Abstract: The present disclosure provides methods and systems for printing a three-dimensional part. The method comprises: receiving in computer memory a digital model of said three-dimensional object; using one or more computer processors to partition said digital model of said three-dimensional part into a plurality of partitions, wherein a given partition of said plurality of partitions comprises a plurality of slices, and wherein a given slice of said plurality of slices comprises a plurality of segments; receiving, from a user, one or more parameters that specify a printing configuration for at least one segment of said plurality of segments; and generating printing instructions based at least in part on said one or more parameters, which printing instructions are usable by a print head to print said three-dimensional object.

Abstract: A method for providing training images including receiving information about objects which is at least valid at a specific recording time. The method includes receiving an image of an area imaged at the specific recording time. The method includes estimating respective positions of the objects at the specific recording time based on the information and selecting estimated positions of respective objects from the estimated respective positions which fulfill a predefined selection criterion. The method includes generating training images by separating the imaged area into first and second pluralities of image tiles. Each of the first plurality of image tiles differs from each of the second plurality of image tiles. Each of the first plurality of image tiles images (depicts) a respective one or several of the selected positions. The method includes providing the training images. Further, a training image product and a device for providing training images are provided.