Abrégé

The present invention relates to real-time surgical simulation in the field of virtual reality. Disclosed is a soft tissue pressing and clamping simulation method for real-time virtual surgery. Pressing and clamping are two common operations during surgery, and for the operation simulation requirements, a multi-scale model is adopted in the present invention for deformation interaction simulation of the soft organ: a coarse-scale mesh is a tetrahedral mesh and is used for simulating the overall deformation of the organ; a fine-scale mesh is a surface triangular mesh and is used for simulating fine deformation during the interaction of the organ and a surgical instrument; a ball tree model is used for calculating directions in which vertexes are discharged after contact. For pressing operation simulation, collision positions of a surgical tool and the soft tissue are obtained by means of continuous collision detection, and after a collision occurs, a guide vector is used to calculate the discharge directions of vertex positions, ensuring that there is no penetration between the surgical tool and the soft tissue surface. For clamping operation simulation, dynamic attachment constraint is used to realize fine interaction between jaws and the soft tissue.

Classes IPC  ?

• G06F 3/01 - Dispositions d'entrée ou dispositions d'entrée et de sortie combinées pour l'interaction entre l'utilisateur et le calculateur
• G06F 17/11 - Opérations mathématiques complexes pour la résolution d'équations
• G06T 17/00 - Modélisation tridimensionnelle [3D] pour infographie
• G06T 17/20 - Description filaire, p. ex. polygonalisation ou tessellation
• G06T 19/00 - Transformation de modèles ou d'images tridimensionnels [3D] pour infographie

Abrégé

An enamel-like bionic composite material with a hierarchical structure and a preparation method therefor. The method comprises the following steps: assembling nanowires by adopting a wet spinning technique to obtain nanoclusters; dissolving a polymer in water to obtain a clear solution; dispersing the nanoclusters into an organic solution to form a uniform suspension as a slurry; adopting a bidirectional freezing ice-templating technique to assemble the nanoclusters into a macroscale parallel layered arrangement framework; and compacting the framework by means of mechanical compression densification, and acquiring an enamel-like composite material with a hierarchical structure. The enamel-like bionic composite material with the hierarchical structure, prepared by adopting the wet spinning technique to obtain the nanoclusters assembled by one-dimensional nanowires and then by means of the ice-templating technique and the method of mechanical compression densification, exhibits mechanical properties matched with real enamel, thereby meeting the requirements of high strength and high toughness of the composite material in engineering.

Classes IPC  ?

• A61K 6/838 - Composés du phosphore, p. ex. apatite
• A61K 6/802 - Préparations pour la fabrication de dents artificielles, l’obturation ou le recouvrage des dents comprenant des céramiques
• A61K 6/80 - Préparations pour la fabrication de dents artificielles, l’obturation ou le recouvrage des dents
• A61K 6/887 - Composés obtenus par des réactions faisant intervenir uniquement des liaisons non saturées carbone-carbone
• A61K 6/898 - Polysaccharides

Abrégé

The present invention discloses an SMA wire-driven reusable release mechanism having a self-resetting function. The present invention adopts a structure of two-stage load reduction and one-stage release. First-stage load reduction: a compression rod and a hoop petal, as well as an inclined block and a shell or a sliding block, all cooperate with each other by means of inclined surfaces, which can transfer most of tension load of the compression rod to the shell, leaving only a small part of the load transmitted to a thrust bearing. Second-state load reduction: balls in the thrust bearing are coated with a molybdenum disulfide lubricating coating, which can effectively reduce friction so as to reduce a torque transmitted to a driving shaft. First-stage release: the driving shaft drives a thrust bearing to rotate by a certain angle, causing an upper ring of the thrust bearing to descend to release a certain axial clearance.

Classes IPC  ?

• B64G 1/22 - Parties de véhicules spatiaux ou équipements spécialement destinés à être fixés dans ou sur ces véhicules
• B64G 1/64 - Systèmes pour réunir ou séparer des véhicules spatiaux ou des parties de ceux-ci, p. ex. aménagement pour l'accostage ou l'amarrage

Abrégé

An airborne positioning integrity monitoring method and apparatus. The method comprises: acquiring a positioning signal; eliminating a code phase offset and a Doppler frequency generated in a positioning signal transmission process, and determining an original positioning signal; determining a first pseudo-range observable and a second pseudo-range observable, wherein the first pseudo-range observable is a pseudo-range observable between a satellite and a user determined according to an original GNSS signal, and the second pseudo-range observable is a pseudo-range observable between the user and a ground station determined according to an original LDACS signal; performing exception elimination processing on the first pseudo-range observable and the second pseudo-range observable; and performing positioning solution according to the first pseudo-range observable after exception elimination processing and the second pseudo-range observable after exception elimination processing to determine a positioning result of the user. By performing exception elimination processing and eliminating the code phase offset and the Doppler frequency generated in the positioning signal transmission process, the airborne positioning accuracy can be improved.

Classes IPC  ?

• G01S 19/20 - Contrôle d'intégrité, détection ou isolation des défaillances du segment spatial
• G01S 19/42 - Détermination de position
• G01S 19/11 - Éléments coopérantsInteraction ou communication entre les différents éléments coopérants ou entre les éléments coopérants et les récepteurs fournissant des signaux de positionnement supplémentaires dédiés les éléments coopérants étant des pseudolites ou des répétiteurs de signaux de systèmes de positionnement par satellite à radiophares

Abrégé

Disclosed in the present invention is an SMA-wire-driven reusable release mechanism with a self-resetting function. The present invention uses a two-stage load reduction and one-stage release structure. First-stage load reduction involves: a compression rod and a hoop section, and an inclined block and a housing or a sliding block match each other by means of inclined faces, such that most of tension loads of the compression rod can be effectively transmitted to the housing, and only the remaining small portion of loads are transmitted to a thrust bearing. Second-stage load reduction involves: molybdenum disulfide lubricating coatings are sprayed to balls in the thrust bearing, such that a friction force can be effectively reduced, and thus torque transmitted to a driving shaft is reduced, and an axial load is effectively borne. One-stage release involves: the driving shaft drives the thrust bearing to rotate at a certain angle, such that an upper ring of the thrust bearing drops to release a certain axial clearance. The structure can greatly improve the bearing capacity of the mechanism and simultaneously improve the reliability of release. The present invention can achieve self-resetting, and has a large release load, strong vibration resistance and impact resistance and high stability.

Classes IPC  ?

• B64G 1/64 - Systèmes pour réunir ou séparer des véhicules spatiaux ou des parties de ceux-ci, p. ex. aménagement pour l'accostage ou l'amarrage

Abrégé

The present application relates to a fuel atomization performance testing apparatus. In the apparatus, a fuel spraying unit is used for spraying fuel to be tested, to form a first atomization field and a second atomization field; a first atomization parameter acquisition unit comprises a first atomization field image acquisition subunit and a first atomization parameter testing subunit, the first atomization field image acquisition subunit is used for acquiring a corresponding first atomization field image when light passes through the first atomization field, and the first atomization field image comprises a shadow image corresponding to first-form fuel; the first atomization parameter testing subunit is used for performing image processing and data processing on the basis of the first atomization field image to obtain first atomization parameters; a second atomization parameter acquisition unit is used for testing second-form fuel of the second atomization field to obtain second atomization parameters of the second-form fuel. By using the apparatus, accurate measurement for fuel atomization effect can be implemented when the fuel atomization fields are rapidly changed.

Classes IPC  ?

• G01N 21/49 - Dispersion, c.-à-d. réflexion diffuse dans un corps ou dans un fluide

Abrégé

An interference source determination method, comprising: obtaining detection data transmitted by reference stations (1) in an airport to be detected (S1); for each reference station (1), when the detection data transmitted by the reference station (1) does not comprise carrier-to-noise ratio data, determining, according to received signal power, whether an interference source is present in the airport to be detected (S2); when the detection data transmitted by the reference station (1) comprises carrier-to-noise ratio data, determining, according to the carrier-to-noise ratio data, whether an interference source is present in the airport to be detected (S3); if the interference source is present in the airport to be detected, generating a direction-finding control instruction, and sending same to the reference station (1) (S4); and obtaining angle information of the interference source transmitted by the reference station (1) which determines that the interference source is present, and determining the position of the interference source according to the angle information (S5). The present invention can be suitable for interference source detection when a receiver cannot perform capturing and tracking, and the detection efficiency and accuracy of the interference source of the airport are improved. In addition, further provided are a reference station (1), a control center (2), and an interference source detection system and method.

Classes IPC  ?

• G01S 19/21 - Problèmes liés aux interférences

Abrégé

Disclosed is a method for joint estimation of stellar atmospheric refraction and star tracker attitude, including: capturing, by a star tracker, an image of stars, and recognizing the image to obtain a matching relationship between an observed star and a reference star; transforming the reference star to a terrestrial reference frame based on time and position of observation to obtain a true zenith distance of the reference star; calculating an estimated stellar atmospheric refraction based on a simplified atmospheric refraction model, the true zenith distance, and an initial atmospheric refractive coefficient, and subjecting the reference star to stellar atmospheric refraction compensation; calculating the star tracker attitude, and re-projecting the observed star to the terrestrial reference frame to calculate the observed stellar atmospheric refraction and the stellar atmospheric refraction error; if the observed stellar atmospheric refraction is misaligned with the estimated stellar atmospheric refraction, adjusting the atmospheric refractive coefficient based on the stellar atmospheric refraction error, and then recompensating the reference star and calculating the attitude, till the observed stellar atmospheric refraction is aligned with the estimated stellar atmospheric refraction, whereby joint estimation results of the stellar atmospheric refraction and the star tracker attitude are obtained. The disclosure realizes real-time, autonomous estimation and cancelation of stellar atmospheric refraction without being limited by external sensors or empirical formulae.

Classes IPC  ?

• G01C 21/02 - NavigationInstruments de navigation non prévus dans les groupes par des moyens astronomiques

Abrégé

Disclosed are an aircraft and emergency navigation communication system based on a Beidou short message. The aircraft comprises a front electronic cabin and a rear passenger cabin; the front electronic cabin comprises an airborne interface device, an inertial measurement unit, a flight management system, an electronic flight bag, a multi-mode receiver, and a communication management unit/air traffic service unit; the rear passenger cabin comprises a positioning module; the positioning module determines the final position of the aircraft on the basis of multi-constellation and multi-frequency-point signals by using an automatic positioning mode selection method; the flight management system formulates an optimal flight plan according to a first positioning parameter or a second positioning parameter. According to the present invention, the positioning module is upgraded, the final position of the aircraft is determined on the basis of the multi-constellation and multi-frequency point signals by using the automatic positioning mode selection method, so as to implement multi-frequency-point accurate positioning of the second positioning parameter; meanwhile, the solution of formulating the optimal flight plan and implementing automatic control of a flight task under special circumstances is also provided.

Classes IPC  ?

• G01S 19/41 - Correction différentielle, p. ex. DGPS [GPS différentiel]
• G08G 5/00 - Systèmes de contrôle du trafic aérien

Abrégé

A method and system for the positioning and integrity monitoring of an APNT service. The method comprises: determining a positioning precision requirement in a target scene (101); if the positioning precision requirement is high-precision positioning, determining the location of an aircraft by using a combined positioning algorithm, and performing integrity monitoring on combined positioning by means of multi-solution separation (102); if the positioning precision requirement is low-precision positioning, determining whether the aircraft is a high-altitude user (103); and if not, determining the location of the aircraft by using an LDACS-based air-to-air positioning algorithm of a high-altitude user and a low-altitude user, and performing integrity monitoring on air-to-air positioning by using a least square residual method (104). The present invention can provide various APNT alternative schemes for an aircraft according to different requirements of a user on positioning precision and actual application conditions, and perform fault detection algorithm research for each alternative scheme, thereby realizing the integrity monitoring of an APNT service.

Classes IPC  ?

• G01S 19/45 - Détermination de position en combinant les mesures des signaux provenant du système de positionnement satellitaire à radiophares avec une mesure supplémentaire

Abrégé

A multi-color quantitative magnetic nanoparticle imaging method and system based on trapezoidal wave excitation solves the problem that the existing technology cannot implement multi-color quantitative magnetic particle imaging. The method includes: constructing, based on hysteresis effect and hysteresis inertial growth differences of n superparamagnetic iron oxide nanoparticles (SPIOs) under trapezoidal wave excitation, an equation set of quality of n SPIOs in a to-be-tested sample formed by any composition of n SPIO standard products; solving the equation set to obtain the quality distribution of the to-be-tested sample at position r; and performing rearrangement, color assignment, and image merging on the quality distribution to implement multi-color quantitative imaging of various particles in magnetic particle imaging (MPI). The method broadens the functions of MPI to realize multi-color quantitative imaging, such that MPI has greater potential for application in the medical field.

Classes IPC  ?

• G01R 33/12 - Mesure de propriétés magnétiques des articles ou échantillons de solides ou de fluides
• G06T 11/00 - Génération d'images bidimensionnelles [2D]

Abrégé

A method for the joint estimation of the atmospheric refraction and ground attitude of a ground-based star tracker. The steps comprise: a star tracker capturing a star chart and performing star chart identification to obtain the matching relationship between an observed star and a reference star; according to the time and place of observation, converting the reference star into a geographic coordinate system, and obtaining true zenith angle of the reference star; by using a simplified atmospheric refraction model, the true zenith angle, and an initial astronomical refraction coefficient, calculating an estimated astronomical refraction, and performing astronomical refraction compensation on the reference star; calculating the attitude of the star tracker to the ground, re-projecting the observed star onto the geographic coordinate system, and calculating the observed astronomical refraction and an astronomical refraction error; if the observed astronomical refraction does not match up with the estimated astronomical refraction, adjusting the astronomical refraction coefficient according to the astronomical refraction error, re-compensating the reference star and calculating the posture until the observed astronomical refraction matches up with the estimated astronomical refraction, and obtaining a joint estimation result of the atmospheric refraction and the ground posture of the star tracker. Thus, the real-time autonomous estimation and elimination of the atmospheric refraction of a star tracker are achieved without depending on an external sensor and without being constrained by an empirical formula.

Classes IPC  ?

• G01C 21/02 - NavigationInstruments de navigation non prévus dans les groupes par des moyens astronomiques
• G01C 21/20 - Instruments pour effectuer des calculs de navigation

Abrégé

A constellation configuration optimization method for an ARAIM-application-oriented low earth orbit satellite enhancement system, the method comprising: 1. when it is determined that integrity risks and continuity risks are equally distributed, traversing all subset solutions and post-fault-mode vertical protection levels, and determining constraint conditions for low earth orbit satellite constellation configuration parameters; 2. determining objective functions of the low earth orbit satellite constellation configuration parameters x1, x2, x3, x4, eliminating abnormal calculated values of the vertical protection levels, and screening initial populations of the parameters x1, x2, x3, x4; 3. performing fitness calculation on the objective functions of the low earth orbit satellite constellation configuration parameters x1, x2, x3, x4; 4. starting from a second-generation population, combining a parent population and child populations, so as to generate new child populations; and 5. performing local optimal selection on the new child populations, screening out maximum values of the objective functions as optimal children, and repeating step 4 until the number of genetic generations is less than the maximum number of genetic generations. A gap in integrity monitoring of a low earth orbit enhancement system is filled, and the availability of an ARAIM airborne receiver is improved.

Classes IPC  ?

• G01S 17/04 - Systèmes de détermination de la présence d'une cible

Abrégé

A magnetic particle imaging method based on a non-ideal Field Free Point (FFP), including the following steps: setting external magnetic field conditions of a non-ideal FFP and an ideal FFP, and obtaining a magnetization vector M of Superparamagnetic Iron Oxide Nanoparticles (SPIOs) and a Point Spread Function (PSF) in combination with a Langevin function; obtaining a signal feature on basis of a voltage signal of a detection coil of a Magnetic Particle Imaging (MPI) instrument; performing integral transformation on the voltage signal collected by the detection coil of the MPI instrument to obtain a voltage signal of an equivalent ideal FFP; averaging the moving speed of an FFP of the MPI instrument to obtain a moving speed of the equivalent ideal FFP; obtaining an equivalent Three-Dimensional concentration reconstruction image on basis of the voltage signal of the equivalent ideal FFP and a moving speed of the equivalent ideal FFP.

Classes IPC  ?

• G01R 33/12 - Mesure de propriétés magnétiques des articles ou échantillons de solides ou de fluides

Abrégé

A stellar atmospheric refraction measurement correction method based on collinearity of refraction surfaces, comprising: performing star identification on the basis of observed star vectors in a star sensor and the reference star catalog, to obtain matching relationships between observed stars and reference stars; converting reference star vectors corresponding to the observed stars to a geographic coordinate system before entering the atmosphere to obtain zenith distances and azimuth angles of incident stellar; on the basis of a principle of collinearity of refraction surfaces, performing optimal solving according to imaging coordinates of observation stars, to obtain the optimal position coordinates of the zenith direction on an imaging surface of the star sensor; according to the optimal zenith direction, performing atmospheric refraction correction on all the recognized observed stars by means of the trigonometric cosine formula to obtain corrected star coordinates; and performing optimal solving to obtain the attitude of the star sensor in the geographic coordinate system.

Classes IPC  ?

• G01S 3/786 - Systèmes pour déterminer une direction ou une déviation par rapport à une direction prédéterminée utilisant le réglage d'une orientation des caractéristiques de directivité d'un détecteur ou d'un système de détecteurs afin d'obtenir une valeur désirée du signal provenant de ce détecteur ou de ce système de détecteurs la valeur désirée étant maintenue automatiquement

Abrégé

The present invention provides a system for microalgae carbon fixation regulated based on natural environmental changes, which includes the following units: a microalgae cultivation unit; a light condensing unit configured to receive sunlight and increase light power density, the light condensing unit including one or more angle-adjustable light-condensing reflective panels; a light splitting unit configured to receive and split light transmitted from the light condensing unit, the light splitting unit including one or more angle-adjustable light splitting panels, the light splitting panel being capable of transmitting light within a spectral band in which microalgae has highest photosynthetic efficiency to thus allow the light to irradiate the microalgae cultivation unit, while being capable of reflecting light within other spectral bands; and a thermosiphon temperature control unit configured to control a temperature of the microalgae cultivation unit by controlling an opening degree of an air regulating valve above the microalgae cultivation unit.

Classes IPC  ?

• B01D 53/62 - Oxydes de carbone
• B01D 53/84 - Procédés biologiques

Abrégé

A starlight atmospheric refraction measurement correction method based on collinearity of refraction surfaces, comprising: performing star pattern recognition on the basis of observed fixed star vectors in a star sensor and a reference star catalog, to obtain matching relationships between observed stars and reference stars; converting reference star vectors corresponding to the observed stars to a geographic coordinate system before entering the atmosphere to obtain zenith distances and azimuth angles of incident star light; on the basis of a principle of collinearity of refraction surfaces, performing optimal solving according to imaging coordinates of all fixed stars obtained by star pattern recognition and azimuth angles thereof before entering the atmosphere, to obtain position coordinates of the zenith direction on an imaging surface of the star sensor; according to the obtained position coordinates of the optimal zenith direction on the imaging surface, performing atmospheric refraction correction on all the recognized observed fixed star image surface coordinates by means of a trigonometric cosine formula to obtain corrected fixed star coordinates; and performing solving to obtain the attitude of the star sensor in the geographic coordinate system.

Classes IPC  ?

• G01C 25/00 - Fabrication, étalonnage, nettoyage ou réparation des instruments ou des dispositifs mentionnés dans les autres groupes de la présente sous-classe
• G01C 21/02 - NavigationInstruments de navigation non prévus dans les groupes par des moyens astronomiques
• G06K 9/62 - Méthodes ou dispositions pour la reconnaissance utilisant des moyens électroniques

Abrégé

A microalgae carbon sequestration system which regulates on the basis of changes in the natural environment. The microalgae carbon sequestration system comprises the following units: a microalgae culturing unit; a condenser unit, used for receiving sunlight and increasing optical power density, and comprising one or more adjustable-angle condensing and reflecting plates; a beam splitting unit, used for receiving a light beam transmitted from the condenser unit and splitting the light beam, and comprising one or more adjustable-angle beam-splitting plates; the beam-splitting plates being capable of transmitting light beams of a spectral band in which the photosynthetic efficiency of microalgae is most efficient and shining on the microalgae culturing unit, and at the same time being capable of reflecting light beams of other bands; and a thermosiphon temperature control unit, which controls the temperature of the microalgae culturing unit by controlling the degree of openness of an air regulating valve above the microalgae culturing unit.

Classes IPC  ?

• B01D 53/84 - Procédés biologiques
• B01D 53/62 - Oxydes de carbone

Abrégé

The present invention relates to a high-performance computer vision system and method for measuring the wings deformation of insects with high flapping-frequency, large stroke-amplitude and excellent mobility during free-flight. A geometrical optic unit composed of a polyhedral reflector with four reflection-planes and four planar reflectors is used to image one high-speed CMOS camera to four virtual cameras, combined with double laser-sheet sources, multiple virtual stereo and structured-light sensors are available to observe the free-flight of insect at different viewpoints simultaneously. In addition, an optoelectronic guiding equipment is included to lead the free-flight of insect and trigger the camera to capture the image sequences of insect-flight automatically. The deformation of insect-wings can be reconstructed by the spatial coordinates of wing-edges and the distorted light-lines projected on the surface of wings.

Classes IPC  ?

• G06K 9/00 - Méthodes ou dispositions pour la lecture ou la reconnaissance de caractères imprimés ou écrits ou pour la reconnaissance de formes, p.ex. d'empreintes digitales
• H04N 15/00 - Systèmes de télévision stéréoscopique en couleurs; Leurs détails