2363results about How to "Guarantee unimpeded" patented technology

The invention discloses a graphene film with ultrahigh flexibility and high thermal conductivity and a preparation method of the graphene film. The graphene film is prepared from an ultralarge uniform graphene oxide sheet through steps of solution film-formation, chemical reduction, high-temperature reduction, high-pressure compression and the like. The graphene film is formed through physical crosslinking of macroscopic multi-layer folded graphene with microscale folds, and inter-lamella slippage can be realized, so that the graphene film has ultrahigh flexibility. The graphene lamellar structure of the graphene film is perfect, the lamellas have ultralarge crystalline areas which are about 100 mu m and contain few defects, the structure is compact after high-pressure compression, and the graphene film has ultrahigh electrical conductivity and thermal conductivity. The graphene film with ultrahigh flexibility and high thermal conductivity can be bent repeatedly more than 1,200 times, the elongation at break is 12%-18%, the electrical conductivity is 8,000-10,600 S / cm, the thermal conductivity is 1,800-2,600 W / mK, and the graphene film can be used as a high-flexibility, thermal-conducting and electric-conducting device.

The invention discloses a fire-resistant ceramic silicone rubber, a preparation method of the fire-resistant ceramic silicone rubber and application of the fire-resistant ceramic silicone rubber and in wires and cables. The rubber comprises 100 parts of methyl vinyl silicone rubber, 30-80 parts of carbon-white, 9- 40 parts of alumina, 1.5-8 parts of structure controlling agent, 3-5 parts of sintering additive, 0.25-1.5 parts of surface treating agent and 0.5-2 parts of crosslinking agent. The preparation method is as follows: covering rubber on and milling uniformly the methyl vinyl silicone rubber, feeding the carbon-white, the alumina, the surface treating agent, the structure controlling agent, the sintering additive and the crosslinking agent in turn, remlling the stand sizing material to recover plasticity, so as to obtain the fire-resistant ceramic silicone rubber provided by the invention. The fire-resistant ceramic silicone rubber provided by the invention has the characteristics of compact ceramic body, stable structure, stable fire-resistance property and good insulation property.

The invention relates to a preparation method of ceramizing fire-resistant silicon rubber. The rubber comprises the following components in parts by weight: 100 parts of methyl vinyl silicon rubber, 20-50 parts of white carbon black, 2-10 parts of hydroxyl silicone oil, 1-5 parts of a coupling agent, 25-100 parts of ceramizing powder, 2-5 parts of a heat stabilizer, 10-40 parts of a fire retardant, and 1-2 parts of a vulcanizer. The preparation method includes the following steps: adding the methyl vinyl silicon rubber in a kneading machine; then adding the white carbon black and the hydroxyl silicone oil; mixing for 30 minutes at the temperature of 80 DEG C; then adding the coupling agent, the ceramizing powder, the heat stabilizer and the fire retardant; mixing for 1-1.5 hours; raising the temperature to be 100 DEG C and keeping high vacuum for 30 minutes; and after cooling to room temperature, adding the vulcanizer on an open mixing machine for mixing to obtain the ceramizing fire-resistant silicon rubber. The rubber has good mechanical property and electrical property at normal temperature, does not contain halogen, is smokeless and non-toxic during combustion, can be extinguished quickly and forms a ceramizing shell to guarantee integrity of the inside.

The present invention discloses one kind of supercritical water catalytic coal and biomass gasifying process and apparatus for producing hydrogen. The apparatus has material feeder with one inlet connected to the outlet of the material pump and the other inlet connected to the outlet of feeding tank, pre-heater with outlet connected to the preheated water inlet and inlet connected to the outlet of inner pipe outlet of the cooler, cooler with inlet connected to the inlet of water pump, water pump with outlet connected to the water tank, cooler jacket with outlet connected to the inlet of the first filter and the inlet of the second filter, and back pressure valve with inlet connected to the outlets of the first filter and the second filter. The present invention has special heating mode for fast heating of the reaction material, raised hydrogen content in the gas product, raised CO2 content in the gas product, and easy separation of CO2 and feeding of CO2 to the processing terminal. The present invention is simple, effective and feasible.

The invention relates to a novel cavity isolation graft of abdominal aorta-internal iliac artery, which consists of a metal wire stent (1) and tubular fiber fabric (2) fixed in the stent. The graft is divided into a straight cylinder part (3) and a furcation part (4); the first Z-shaped stent circle of the upper end of the straight cylinder is not covered by the fabric, and the lower end of the straight cylinder is the furcation part which is provided with a long branch (4.1) and a short branch (4.2); the positions of the two branches are corresponded to the two sides of an external iliac artery; a length-added branch (6) can be inserted into the short branch; relevant parts of the metal wire stent are provided with metal markers (5) so that the graft can be pushed to a lesion part precisely by a conveyor under X line; the graft is characterized in that the long branch (4.1) is provided with an internal iliac artery branch (7); the length-added branch (6) of the short branch can also be provided with an internal iliac artery branch. The graft has the advantages of simple structure, convenient operation, capability of effectively isolating the blood from the lesion vein sections of the abdominal aorta and (or) the external iliac artery and (or) the internal iliac artery, guaranteeing unblocked blood flow, eliminating hidden troubles of pelvic ischemia, and high surgical success rate.

An intelligent video traffic monitor system based on multi-viewpoint comprises three-layer structure of video group and video cluster as well as video network. Its monitoring method includes dividing traffic area of global road to be three-layer structure of video group and video cluster as well as video network and then carrying out monitor by utilizing said system based on prepared three-layer structure.

The invention provides a heterogeneous database platform data synchronization method. The heterogeneous database platform data synchronization method includes the following steps that a first external data exchange module and a second external data exchange module which correspond to a source database and a target database respectively are installed in a PostgreSQL database, and a first external data exchange module extender, a first external server, a second external data exchange module extender and a second server are built, wherein the source database and the target database are heterogeneous databases; a first external data table and a second external data table which are in mapping relation with the source database and the target database respectively are built, and triggers for capturing data changes are built. The PostgreSQL database and the corresponding data exchange modules serve as media innovatively to achieve data synchronization / copying between external multi-source heterogeneous databases.

The invention relates to a Beidou visual fusion accurate lane identification and positioning method and an implementation device thereof. The Beidou visual fusion accurate lane identification and positioning method comprises the following steps: (1) lane detection: detecting and identifying lane lines and dividing the lanes; identifying current, left and right lane types, and determining the current lane of the vehicle; (2) performing map matching to obtain positioning information; determining a road where the vehicle is located, and extracting information such as road lane number, lane type,lane width, bus lane opening time and the like; measuring the vehicle speed, and obtaining BTD; (3) positioning correction: correcting a Beidou positioning result; and (4) monitoring and early warning, judging whether the vehicle runs on the road, and if so, capturing, identifying and uploading. By means of the Beidou visual fusion accurate lane identification and positioning method, a common lane, a bus lane, an emergency lane and a reversible lane can be accurately identified, meanwhile, different colors of masks are used for distinguishing, so as to provide a reference for a driver, and provide more accurate positioning for an auxiliary driving and navigation system.

The invention relates to a tunnel-assembled lining structure and a tunnel across a large-scale active fault zone in a strong earthquake zone, and relates to the field of transportation infrastructureconstruction. The structure comprises an initial support layer, a spray film waterproof layer, an assembly type concrete-filled steel tube lining layer and a flexible joint; the assembly type concrete-filled steel tube lining layer is provided with a plurality of concrete-filled steel tube lining sections, each section is provided with a first steel tube sheet, a second steel tube sheet and a third steel tube sheet which are arranged from outside to inside, a first lining layer is arranged between the first steel tube sheet and the second steel tube sheet, and a second lining layer is arrangedbetween the second steel tube sheet and the third steel tube sheet. The first lining layer includes a plurality of hollow steel tubes arranged at intervals and lightweight foam concrete for filling gaps, the second lining layer comprises high compressibility concrete, and the lining sections are connected through the steel plate spring type flexible joint. The structural stability under dislocation and strong earthquakes can be ensured, and the tunnel-assembled lining structure has functions of quick installation, replacement and quick repair; the principle of stiffness matching is fully considered in the structure, and multiple measures are combined to 'lead the earthquake'.

The invention discloses an air brick used for a magnesium and carbon ladle, and a producing method thereof, aiming at producing high-quality air bricks used for the ladles. The mass percentage of the chemical compositions of the air brick is: 55 to 99 percent of MgO, 0 to 20 percent of C, 0 to 20 percent of AI2O3, 0 to 5 percent of ZrO2, 0 to 5 percent of AI, 0 to 5 percent of AI-Mg alloy, 0 to 5 percent of CaB6, and 0 to 2 percent of B4; the physical property indexes are: volume density (g / cm<3>): 3.00 to 3.15, apparent porosity (%): 1.5 to 5.0, cold compressive strength (MPa): 40 to 65, and distortion resistance at high temperature (MPa): 14.0 to 25.0. Raw materials adopted by the invention comprise fused magnesite, magnesite clinker, crystalline flake graphite, corundum, zirconia and oxidation inhibitor. The raw materials are added into a pug mill and externally added with a bonding agent for mulling. Mulled pug is added into a mould, and molded by utilizing isopressing equipment or a friction brick press or a hydraulic press. The invention obviously reduces the apparent porosity of the air brick, not only can improve the basic slag corrosion resistant capability of the air brick, but also can reduce the cost of the raw materials by more than two thirds.

The invention discloses a vacuum brazing technology method between copper and stainless steel dissimilar metal water connector, comprising processing each part of the water connectior, controling the processing precision and component assembly clearance; washing the part of water connectior; assembling water connections and putting in special fixture. Put the fixture in vacuum brazing furnace and carry out braze welding according to the following brazing technology: 1) take 35 minutes to make the furnace temperature to rise to 650 DEG C at a uniform speed; 2) continue to preserve heat for 20 minutes; 3) rise the furnace temperature at a uniform speed to 890 DEG C in 20minutes; 4) continue to preserve the heat for 20 minutes; 5) then rise the furnace temperature to 970 DEG C+-10 DEG C at a uniform speed in 15 minutes; 6) Continue to preserve heat for 5 minutes; 7) then stop heating and cool naturally; 8) on the next day take out the water connector from the fixture; 9) carry out the acceptance test by using the ultrasonic automatic testing device. The technical problem that the annular gap of the water connector is not fully filled and can be corroded is solved; the invention has the advantages of reliable method and high production efficiency, and can effectively improve the qualified rate of the products.

The invention discloses a miniature boat for automatically cleaning floater on water surface. The boat comprises a left-right arranged boat body, a boat body actuating mechanism, a boat body steering mechanism, a floater collecting mechanism and a remote control device controlling each mechanism, wherein electric energy for operating each mechanism is provided by a storage cell; the floater collecting mechanism is arranged between two boat bodies, and comprises a runner of the fore and a waste bin of the aft; the boat body actuating mechanism can be propellers arranged on the stern of each boat body; and double propellers are used as the boat body steering mechanism. The boat is provided with an image collecting, transmitting and receiving device, a satellite positioning device, a solar polar plate and a voice device, so that the boat can be a true remote robot on water, is particularly suitable for cruising in a brook, and can collect and clean the floater in the brook at proper time.

The invention provides a network switching method including a terminal connecting wireless local area network. After a terminal is connected to the wireless local area network, the terminal judges whether the wireless local area network can visit Internet or not. If the local area network cannot visit the Internet, the terminal disconnects with the wireless local area network and uses a mobile network. According to the invention, the terminal can judge whether the wireless local area network can visit Internet or not. If the local area network cannot visit the Internet, the terminal can use the mobile terminal, so that communication can be guaranteed and service interruption is avoided. Therefore, user experience is improved.

The invention discloses a route selection algorithm applied to a heterogeneous network of a multi-level satellite communication system, in which a cognitive routing algorithm based on learning is adopted and the problem of non-uniform link selection due to many end-to-end links in the heterogeneous satellite links is solved. Each link utilization rate value is cached in the route selection process, and by analyzing the link utilization rate at different moments and introducing a smoothing factor to predict the link utilization rate of the next moment, the conditions such as congestion time delay and the like around can be quickly and accurately sensed so as to achieve the aim of adaptively selecting the routing path, thereby balancing the whole load of the global heterogeneous network. The multi-layer satellite communication system comprises two satellites under a high orbit and a satellite on a medium-low orbit.

The invention provides a traffic accident scene evidence collection guiding system and method. The system includes the following procedures: vacant information in an accident list is completed by a user through a mobile terminal, wherein accident ID, site (GPS information) where the accident occurs, time, accident type, number of participators and license plate numbers are included in the accident list; after the accident list is generated, the system starts an accident evidence collection module, corresponding evidence collection sub-modules are called according to the accident type and number of participators in the accident list, and then evidence collection shooting is guided for the user; after shooting is completed, and additional recording can be recorded by the user according to the site condition; finally, the accident list, images and voice frequency are packaged as an evidence package, then the evidence package is sent to a server and the evidence is saved by the server waiting for admissibility. According to the invention, a mobile phone of the user is used as image or video collection equipment, shooting and evidence collection is carried out by a car owner by him / herself with the accident, so that evidence collection procedures of minor traffic accidents can be simplified, the self-evidence-collection procedure is carried out quickly and efficiently, and quick settlement of claims by insurance companies or related departments is facilitated.

The invention relates to the technical field of battery materials, in particular to a coupled carbon nano tube-graphene composite three-dimensional network structure-coated ternary material and a preparation method thereof. According to the coupled carbon nano tube-graphene composite three-dimensional network structure-coated ternary material, a nickel-cobalt-manganese ternary material, carbon nano tubes and graphene are taken as raw materials; and the ternary material is characterized by being prepared by the following steps: with polyvinyl pyrrolidone as a dispersing agent, through a liquid-phase self-assembling method, simultaneously connecting the graphene and the carbon nano tubes with a silane coupling agent to form a three-dimensional network structure; and evenly dispersing the coupled carbon nano tube-graphene composite material and the nickel-cobalt-manganese ternary material through a physical method, coating the surface of the nickel-cobalt-manganese ternary material, and sintering the nickel-cobalt-manganese ternary material in an inert atmosphere, so as to obtain the evenly coated product. The product provided by the invention has the advantages of high specific discharge capacity, long cycle life and simplicity in preparation process; and large-scale production is easy to realize.

The invention discloses a real-time optimal configuration method for lane resources of a multi-lane expressway. The real-time optimal configuration method for the lane resources of the multi-lane expressway comprises the following steps of traffic data acquisition, equivalent traffic volume confirmation, saturability calculation, passenger car and freight truck separation confirmation, lane resource configuration, lane speed limitation confirmation and real-time information issuing. Flow data of different vehicles running on the expressway are acquired and analyzed in real time, whether passenger cars and freight trucks on the expressway need to be separated from each other or not is determined, lane speed limitation measures under the condition of passenger car and freight truck separation and lane speed limitation measures under the condition of passenger car and freight truck combination are confirmed, and a real-time lane resource configuration scheme is formed. The lane resources of the expressway are distributed and controlled in real time, safety problems caused by mixed flow of the passenger cars and the freight trucks are reduced, speed advantages of the different vehicles can be played to a maximum extent, and the traffic efficiency of the expressway is improved.

The invention relates to a micro-nano-structure anode material for a Li-air battery and a preparation method of the micro-nano-structure anode material. The preparation method comprises the following steps of: preparation of hollow composite precursor fibers through electrostatic spinning by blending a metal nitride catalyst precursor with a high-carbon polymer in an organic solvent, preprocessing of the precursor fiber material, nitridation of complex fibers, and pore-forming and pore-expansion through activation. The preparation method is simple in technique and convenient to operate and is easy to realize the uniform distribution of nanoscale catalyst particles in hollow carbon fibers. A prepared anode material tube is hollow internally, a plurality of holes are formed on the wall of the tube, and metal nitride catalysts are uniformly distributed in the three-dimensional holes of the wall of the tube, so that high specific surface area provides a sufficient place for the reaction of the battery, and the hollow pore passage in the tube can ensure an oxygen diffusion channel to be smooth and has good ion transport capacity and electrical conductivity. According to the invention, the charge-discharge capacity of the Li-air battery can be improved effectively, the power multiplying performance and the power density of the Li-air battery can be improved, the internal resistance of the battery can be reduced, and the charge-discharge polarization can be lessened through the uniform distribution of the nanoscale metal nitride, therefore, the micro-nano-structure anode material has good industrialization prospect.

The invention discloses a no-parking system and method for a highway. A payment system comprises a payment device and a lane control device; the payment device comprises a payment terminal, a charging server and an online payment server; the lane control device comprises a lane control computer, a vehicle license plate recognition device and a peripheral lane device. The payment method includes the steps that first, a user logs in the charging server; second, the user looks up a vehicle information database and a highway section charging information database through a handheld terminal or a network terminal so that the amount of money needing to be prepaid can be obtained; third, the user logs in a third-party payment system on the online payment server through one of the handheld terminal and the network terminal, and the user prepay the amount of money to the charging server after successfully logging in the third-party payment system. According to the system and method, the vehicle license plate recognition technology, the network payment technology and the lane control technology are combined, and the no-parking charging function of the highway is achieved well.

The invention discloses a method and a device for controlling network traffic and a local area network system, wherein the method comprises the steps: monitoring a new uplink packet to be sent; controlling the traffic of the uplink packet to be sent in the following modes when triggering condition for traffic control is met: when the uplink packet to be sent comes from a first uplink packet applied in a preset high-priority network, the first uplink packet is added into an uplink sending caching queue; when the uplink packet to be sent comes from a second uplink packet applied in a preset non-high-priority network, whether the second uplink packet is allowed to be sent is determined according to current bandwidth occupation; if yes, the second uplink packet is added into the uplink sending caching queue, or else, the second uplink packet is discarded. The method is capable of lowering influence of some network application to other network applications.

The invention provides a project investment control and management system and a use method thereof. The system comprises a system setting module, a warehousing module, a warehouse-out module, a warehouse returning module, a requirement module, an electronic tag module and an inventory alarming module. The system has the advantages that smooth material flow in a management process is guaranteed through the management and the control of all warehousing and warehouse-out activities of an investment and construction item and the effective statistics and analysis of inventory data, so that a decision maker can find problems early and adopt a corresponding measure to regulate investment and inventory structures, so that a reservation period is shortened, capital turnover is quickened, and inventory occupation is lowered to a maximum extent; the warehousing and warehouse-out situations of important materials can be monitored at any time, hidden dangers can be found in advance, emergencies can be dealt with in time, system operation complexity is reduced by the intelligent design of the system, and the system has the advantages of being stable and reliable in working and simple in maintenance.

The invention relates to a floating platform for a mooring hot air airship. The floating platform comprises a capsule, a nacelle, an anchoring vehicle, a control system, and surface equipment; the capsule is connected with the nacelle through a pendant rope; and a mooring cable is connected with an intersection point at the lower end of the pendant rope and is arranged in the anchoring vehicle. The mooring cable is wound on a hydraulic pressure winch through a positioning disk; and the positioning disk and the hydraulic pressure winch are fixed on the anchoring vehicle. A mooring hot air balloon is released into the air 2,000 m high for carrying a communication base station in a remote operation mode, and quick deployment can be performed at a certain area, so that a smooth communication signal can be guaranteed at emergency and the floating platform has monitoring and detection functions. The floating platform for the mooring hot air airship has the advantages of low use cost, safety and reliability and the like, and is easy to operate and maintain.

The invention discloses a graphene film for light efficient electromagnetic shielding and a preparation method thereof. An oversized graphene oxide sheet is used for forming the film and by virtue of an annealing mode under high temperature, the graphene defect is perfectly repaired, the edge defect is reduced to the lowest to form a perfect large conjugate structure, and the smoothness of a head conducting path of the graphene is guaranteed; furthermore, through three steps of independent warming processes, a functional group is separated from the surface of the graphene step by step, a pore-foaming agent included between the graphene sheets is slowly decomposed, and the functional group and the pore-forming agent are released step by step in a gas mode; and meanwhile, the graphitization process is gradually developed to form a graphene micro airbag; in the forming process of the micro gasbag, the most stable functional group on the surface of the graphene falls off, thereby producing the graphene structure formed by 1-4 layers of graphene sheets with the gas expansion under high temperature; the successful introduction of the graphene few-layer structure greatly promotes the conductivity performance of the material. The micro gasbag structure is assisted by good conductivity performance so that the graphene of the invention has strong electromagnetic shielding performance.

The invention relates to an intelligent crosswalk traffic-light control device, which comprises a microprocessor, a traffic-light control module and a pedestrian data acquisition unit, wherein the pedestrian data acquisition unit acquires the quantity of pedestrians at two ends of a crosswalk in real time; the microprocessor is provided with a communication module in order to obtain traffic-state data of intersections at two ends, which is related to a road; according to the related traffic-state data and pedestrian-quantity data of the intersections at two ends, with the support of preset programs, the microprocessor determines the starting time and time span of a green light allowing the pedestrians to pass and generates traffic-light control instructions; and the traffic-light control device is connected with the microprocessor through a signal line, and receives control signals output by the microprocessor to switch working states of traffic lights. The device can allow the pedestrians to pass under the circumstance that vehicles on the road is small in flow, thereby reducing the influence on the vehicles and overall road traffic conditions as much as possible while ensuring the passing of the pedestrians.

The invention provides a system for recording illegal behaviors of motor vehicles entering a jamming intersection. Video tracking equipment continuously tracks motor vehicles entering the intersection, takes pictures of the motor vehicles crossing the stop mark and identifies license plates of the motor vehicles, and the identified license plates are directly marked in images of the motor vehicles in a screen, so that the system can accurately know the license plate of each motor vehicle entering the intersection and shaded by the following vehicles. In the technical scheme, speed of the motor vehicles crossing the stop mark can be monitored in real time, when the speed is smaller than the threshold value, a prompting unit can remind the follow-up vehicles of not entering the intersection, and jamming of the intersection is avoided; the motor vehicles entering the intersection are photographed when they cannot leave the intersection within the preset time threshold and illegal behaviors are recorded into database. The system is applicable to the intersection without signal-lamp control, consciousness of drivers driving according to law can be improved, and traffic jamming of the intersection without signal lamp control is avoided.

The invention discloses a method and a system for snapshotting a traffic violation vehicle in real time. The system is formed by a ball-shaped monitoring camera and a data processing controller; the ball-shaped monitoring camera is erected above a road, shots the motion conditions of all vehicles on the road in a panorama mode, and sends video to the data processing controller in real time by an internet interface; in the data processing controller, motion states and tracks of all moving objects are detected and stored in real time by technologies such as video image information processing, and whether violation behaviors exist is judged; and if the violation behaviors exist, fast tracking snapshotting is performed. The method and the system for snapshotting the traffic violation vehicle in real time can snapshot by cloud deck rotating and lens zooming, one ball camera can clearly monitor and snapshot a larger range, good frightening action can be realized for various violation behaviors, and safety and smoothness of city traffic can be ensured.

The invention relates to a method for constructing a spinel structure on a surface layer of a lithium-rich manganese-based positive electrode material and belongs to the field of chemical energy storage batteries. The method comprises the following steps: adding the lithium-rich manganese-based positive electrode material into a weakly acidic aqueous solution, and performing Li+ and H+ ion exchange; and performing heat treatment on the positive electrode material subjected to the ion exchange to enable the surface lithium-poor structure to be changed into the spinel structure, thereby obtaining the lithium-rich manganese-based positive electrode material with the spinel structure on the surface layer. According to the method disclosed by the invention, the surface structure of the body material is changed into the spinel structure, so that a lithium-ion transport channel is kept smooth, the rate capability of the lithium-rich manganese-based positive electrode material is improved, and the first-cycle coulombic efficiency is improved. In addition, according to the method disclosed by the invention, the depth of the constructed spinel layer can be effectively regulated by regulating the concentration and treatment time of weak acid, so that the electrochemical performance of the electrode material is adjusted. The control manner is simple and feasible, the reaction time does not need to be strictly controlled, and the reproducibility and reliability are high.

The invention relates to a light emitting diode (LED) electronic screen system for fire fighting propaganda educational training and public service announcement. The system comprises a digital media information management subsystem and a digital media information publishing subsystem, wherein the digital media information management subsystem comprises a management system, a column system, a program system, an LED electronic screen, a terminal management platform and an operation management platform; the digital media information publishing subsystem consists of the LED electronic screen system; the LED electronic screen system consists of a media display terminal, a Web management server, an application server and a data warehouse; the data warehouse is used for providing data information for the Web management server and the application server respectively; the media display terminal is used for browsing and playing information through the Web management server and the application server; and the front end of the LED electronic screen is provided with the media display terminal. The system is a completely new service platform for providing information transfer support for fire fighting; the conventional computer technology, network technology, display technology and the like are comprehensively utilized by the system; and information points are distributed to all geographic regions.

The invention discloses a three-axis sun-oriented control method of a satellite for a guaranteeing satellite-earth link. The three-axis sun-oriented control method comprises the following steps: solving a projection of a sun vector under a satellite orbit coordinate system according to the sun vector calculated according to a satellite orbit; establishing a sun-oriented reference coordinate system according to the satellite orbit and the definition of the satellite polarity, and calculating an attitude quaternion of the sun-oriented reference coordinate system relative to the satellite orbit coordinate system; calculating an error quaternion between an attitude quaternion of a star relative to the satellite orbit coordinate system and the attitude quaternion of the sun-oriented reference coordinate system relative to the satellite orbit coordinate system; carrying out attitude reference tracking according to a symbol of the error quaternion; and when continuously meeting that the error quaternion is smaller than a preset threshold value, establishing a star sensor sun-oriented sign, carrying out three-axis stabilization sun-oriented control by virtue of a star sensor, and otherwise, continuing to carry out two-axis sun-oriented control based on sun sensor. By virtue of the three-axis sun-oriented control method, the smoothness of the satellite-earth link after the sun orientation of a sailboard can be guaranteed, and a near-optimal maneuvering path is guaranteed when a sun-oriented maneuvering manner is changed into a ground-oriented maneuvering manner.

Water-cooling arrangement includes stator cage and cooling water channel. Cooling water channel in stator cage is arranged in axial direction inside stator cage in not helical round about manner. The cooling water channel can be as single circuitous water channel, or a combination formed from multiple circuitous water channels. Each pair of water channel possesses a cooling water outlet and a cooling water inlet. The cooling water outlet and a cooling water inlet can be arranged at axial same side of stator cage, or arranged at different sides. Water outlets and water inlets of multiple water channels can be arranged in same direction or in reversal directions. Circuitous water channels are in reversal directions can reduce temperature gradient at different parts of the stator cage further.