1228results about How to "Improve mobility" patented technology

The invention relates to the technical field of dispatching automation, and discloses a dispatching automation system application state management method which comprises the following steps: dynamic task state management: monitoring dynamic state indexes of various computing tasks in real time; according to different characteristics of task types, making differentiated priority management strategies; the task priority is dynamically adjusted, and it is ensured that key tasks are preferentially and efficiently executed; dynamic resource state management: continuously monitoring dynamic state indexes of various computing resources, wherein the dynamic state indexes comprise utilization rates and load conditions; dynamically adjusting a resource allocation scheme according to the resource state; dynamically optimizing resource allocation to ensure that the overall resource utilization rate of the system is continuously improved; and optimizing a self-adaptive scheduling strategy: introducing a self-adaptive scheduling algorithm based on reinforcement learning. According to the application state management method of the dispatching automation system, dynamic state management is adopted, a traditional static dispatching mode is abandoned, and the method can better adapt to a complex and changeable computing environment.

The invention discloses a VR-based unmanned aerial vehicle inspection method and system, a storage medium and a program product, and the method comprises the steps: calculating a low-polygon terrain model, and carrying out the subdivision smoothing processing, and obtaining a three-dimensional terrain image; matching and registering the panoramic image sequence and the three-dimensional topographic image to obtain a point cloud map; generating a virtual mining area environment map; calculating image quality parameters; when the image quality parameter is lower than a preset threshold value, generating a semi-real and semi-virtual fusion display picture; transmitting the semi-real and semi-virtual fusion display picture to a VR helmet for display, and synchronizing the attitude information of the unmanned aerial vehicle to the VR helmet; when it is determined that a fatigue feature appears according to the brain wave data, the unmanned aerial vehicle is controlled to be switched to a preset autonomous flight mode; constructing a virtual anti-collision boundary; and obtaining an optimized flight path according to the virtual anti-collision boundary, and controlling the unmanned aerial vehicle to inspect according to the optimized flight path. The continuity and reliability of the inspection task are improved, and the safety risk of the inspection task is reduced.

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

The invention relates to a high-activity recombinant XVII type collagen as well as a rapid preparation method and application thereof, and belongs to the technical field of bioengineering. The amino acid sequence of the high-activity recombinant XVII type collagen is as shown in SEQ ID NO. 1, and the nucleotide sequence of the high-activity recombinant XVII type collagen is as shown in SEQ ID NO. 2. The invention also provides a preparation method and application of the recombinant XVII type collagen. The high-activity recombinant XVII type collagen has good biological activity, has good effects of promoting cell adhesion, cell proliferation and cell migration, and can be compounded with other proteins to form raw materials of tissue engineering products, cosmetics, health care products or medicines. The high-activity recombinant XVII type collagen gene is integrated to different positions of a yeast genome through three different vectors, and the copy number of a target gene is increased, so that the expression quantity of the recombinant XVII type collagen is remarkably increased, and the yield of the high-activity recombinant XVII type collagen is effectively increased.

The invention discloses a feature classifier-based thinking chain reasoning mathematical problem solving method and system. The method comprises the following steps of: (1) acquiring a mathematical problem set, and selecting forward and reverse thinking chain examples to splice to form a new set; (2) respectively inputting the new set elements into a model for reasoning to construct a word-level reasoning path spanning tree, and selecting an attention weight matrix after pooling difference processing as node features for storage; (3) traversing all the generated reasoning path spanning trees, and screening nodes meeting requirements to construct a feature classifier training set; (4) training a feature classifier by using a support vector machine algorithm; and (5) through the trained feature classifier, participating in path selection in a pre-training language model reasoning process, and obtaining a relatively accurate reasoning process and answers. By means of the method, adjustment and control of finer granularity of the reasoning path of the pre-training language model can be achieved, accurate reasoning solving of the pre-training language model on mathematical problems is facilitated, and the generalization level of the pre-training language model is improved.

The invention provides a redox imidazole covalent organic framework material as well as a preparation method and application thereof, belongs to the technical field of material preparation and photocatalytic preparation of hydrogen peroxide, and aims to solve the technical problem of low activity of a current covalent organic framework in preparation of hydrogen peroxide. The preparation method of the imidazole-connected redox type imidazole covalent organic framework material comprises the following steps: respectively reacting a reactant 2, 7-di-tert-butylpyrene-4, 5, 9, 10-tetraketone monomer with 4, 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ' The preparation method comprises the following steps: mixing 4, 4 '-(pyridine-2, 4, 6-triyl) tribenzaldehyde and a tri (4-formylphenyl) amine monomer, adding a solvent and a catalyst, uniformly stirring, and reacting to obtain the redox type imidazole covalent organic framework material after the reaction is finished. The application comprises the following steps: adding the covalent organic framework, oxygen and the sacrificial agent into water, and reacting under the irradiation of visible light. The preparation method is green, environment-friendly, simple and easy to implement, the prepared material has good thermal stability, and efficient visible light photocatalysis preparation of hydrogen peroxide can be achieved; meanwhile, the catalyst can be recycled and has good photocatalytic stability.

The invention discloses a manufacturing method of a two-dimensional semiconductor field effect transistor based on a high-k gate dielectric integration technology capable of eliminating a buffer layer. The manufacturing method comprises the following steps: depositing a back gate electrode and a back gate dielectric on a substrate in sequence; transferring the channel layer to the back gate medium; sequentially forming a buffer layer, a source electrode, a drain electrode, a top gate dielectric layer formed by a high-k dielectric material and a top gate electrode on the channel layer; and annealing treatment is carried out in a vacuum environment, and the buffer layer sublimates, so that Van der Waals interfaces are formed between the channel layer and the top gate dielectric layer and between the channel layer and the source electrode as well as between the channel layer and the drain electrode. According to the high-k gate dielectric integration technology based on the erasable buffer layer, the erasable buffer layer after vacuum annealing is utilized, damage to a two-dimensional material is avoided, a high-quality high-k gate dielectric is deposited, interface regulation and control between a channel layer and a top gate dielectric are achieved, and the equivalent oxide thickness is reduced; and good contact between the channel layer and source and drain metal is realized, the contact resistance of the transistor is reduced, and the electrical performance of the transistor is improved.

The invention relates to the technical field of robots, in particular to a waist and hip integration mechanism and a humanoid robot. The waist turnover driving piece is arranged on the hip support; the two lateral extension driving pieces are oppositely arranged on the hip support, and the axes of the driving ends of the two lateral extension driving pieces coincide; the two side unfolding supports are connected to the driving ends of the side unfolding driving pieces correspondingly. The two pitching driving parts are respectively arranged on the side extension bracket; the two pitching supports are connected to the driving end of the pitching driving piece. The two hip turnover driving pieces are arranged on the pitching support, and the driving ends of the hip turnover driving pieces are connected with leg mechanisms of the humanoid robot. Nine degrees of freedom at the waist and hip joints of a traditional humanoid robot are optimized into seven degrees of freedom, the number of motors is reduced, the overall weight is reduced, high flexibility and maneuverability are kept, meanwhile, the cruising ability is improved, more space is vacated for the robot, and the lightweight design of the robot is achieved.

The invention discloses a graphene composite perovskite manganese oxide polycrystalline ceramic and a preparation method and application thereof, and belongs to the technical field of non-refrigeration high-sensitivity infrared detection. The chemical expression of the graphene composite perovskite manganese oxide polycrystalline ceramic is La < 0.81 > (Ca < 0.03 > Sr < 0.16 >) MnO3: Gy, G is graphene, y is the mass fraction of graphene in perovskite manganese oxide composite powder, and y is equal to 0.1-0.2%. The TCR value of the prepared polycrystalline ceramic can reach 30% or above, the Tk value is close to 300K, the polycrystalline ceramic has excellent adaptability to room temperature work and excellent sensitivity to temperature change, and when the polycrystalline ceramic is applied to an uncooled infrared detector, the detection precision of the uncooled infrared detector can be effectively improved.

The invention discloses an active thermal protection system for a high-speed aircraft and a using method of the active thermal protection system. The system comprises a liquid storage tank, an active thermal protection plate, a gas high-pressure storage tank and a thrust engine. The liquid storage tank, the active thermal protection plate and the gas high-pressure storage tank are connected in sequence to form a loop; a first electromagnetic valve and a fourth electromagnetic valve are respectively arranged on a connecting pipeline between the liquid storage tank and the active thermal protection plate and a connecting pipeline between the gas high-pressure storage tank and the liquid storage tank; the gas high-pressure storage tank is further provided with two gas paths, one gas path is connected with the thrust engine through a third electromagnetic valve, and the other gas path is communicated with the outside through a second electromagnetic valve. The liquid storage tank is used for storing a liquid heat-absorbing working medium; and the active thermal protection plate is filled with a catalyst. The active thermal protection system is high in heat absorption capacity, high-temperature and high-pressure gas can be generated through aerodynamic heat to do work, waste heat utilization is achieved, the thickness of a thermal insulation layer of the aircraft is reduced, the effective load of the system is increased, and the maneuverability of the aircraft is effectively improved.

The invention discloses a distributed electric propulsion box type wing ground effect aircraft which comprises a main fuselage, the two sides of the main fuselage are connected with one ends of sweepback wing main wings, one ends of two empennages above the tail of the main fuselage are connected with the main fuselage through vertical tails, and the other ends of the two empennages are connected with the other ends of the two main wings through end plates respectively. The empennage is connected with a plurality of high ducted fans directly driven by a motor, an elevator and an aileron are arranged at the rear part of the empennage, a rudder is arranged at the rear part of the vertical fin, and the elevator, the aileron and the rudder are controlled by a flight control system and are mutually independent. The ground-effect aircraft provided by the invention adopts a box-type wing structure formed by combining the sweepback main wing and the sweepforward empennage, has better aerodynamic performance in a take-off and climbing low-speed flight state, and can provide larger lift force and better maneuvering characteristics.

The invention relates to a thermodynamics-based system for a predictive maintenance function of a switch cabinet, and the system comprises a sensor unit which comprises a temperature measurement sensor and a current sensor and is used for collecting a temperature signal, a current signal and an environment temperature signal of a connection point of a main loop of the switch cabinet in real time; the alarm unit is used for sending out an alarm signal after a fault is predicted to occur when the switch cabinet is in non-full-load operation; and a control unit configured to: calculate a difference between the temperature collected from the sensor unit and an ambient temperature to obtain a temperature rise value; initializing a model based on the corresponding time, the collected current and the calculated temperature rise value to obtain five fitted parameters; performing temperature rise value prediction based on the collected current signals in the prediction time period by using the obtained five parameters; and when the switch cabinet is judged to have a fault according to the comparison result of the predicted temperature rise value and the collected measured value, the alarm unit is controlled to send out an alarm signal.

The invention discloses a double-groove super junction structure and a manufacturing method thereof, the double-groove super junction structure comprises a plurality of MOS cells which are connected in parallel, and each MOS cell comprises a drain electrode, an upper metal source electrode, a grid electrode, a semiconductor epitaxial layer, a substrate layer, a P well layer and an N well layer; a groove is formed between adjacent MOS cells and in the middle of the heavily doped P well layer I through etching, an oxide layer is deposited at the bottom of the groove, a side metal source electrode is arranged on the surface of the oxide layer, and the top of the side metal source electrode is in contact with the upper metal source electrode; the side surface of the side metal source is in ohmic contact with the N well layer, the lightly doped P well layer I and the heavily doped P well layer I; the grid electrode is a longitudinal groove type grid electrode and is arranged between the two N well layers of the single MOS cell, and the grid electrode is connected with the N well layers, the first lightly-doped P well layer and the diffusion layer in an isolated mode through a grid oxide layer. According to the invention, the injection depth of the heavily doped P well layer I is increased through the groove, and the (11-20) surface channel is adopted, so that the interface state density is greatly reduced, and the overall size of the device is reduced.

The invention belongs to the technical field of oxide target materials, and particularly discloses an indium gallium titanium oxide target material and a preparation method and application thereof. The indium gallium titanium oxide target material is prepared from the following raw materials in parts by mass: 95 to 99 parts of indium oxide, 0.5 to 2 parts of gallium oxide and 0.6 to 3 parts of titanium dioxide. According to the preparation method, gallium oxide and titanium dioxide in a proper proportion are doped in the indium oxide-based target material, so that an oxide film prepared from the target material has excellent light transmittance on the premise of keeping relatively low resistivity of the target material, and the oxide film prepared from the target material has relatively good mechanical flexibility, and can be applied to the field of organic light-emitting devices, such as organic light-emitting devices, organic light-emitting devices, organic light-emitting devices, organic light-emitting devices, organic light-emitting devices and organic light-emitting devices. And the method can be better applied to flexible OLEDs. The invention also provides a preparation method of the indium gallium titanium oxide target material.

The invention discloses a translation type cutting device for a tunnel cantilever heading machine, which comprises a disc-shaped mounting seat movably arranged on a base, a multi-angle adjusting mechanism is arranged between the base and the disc-shaped mounting seat, the lower end of the base is connected with the heading machine through a vertical driving oil cylinder, the upper end of the disc-shaped mounting seat is connected with one end of a suspension arm, and the other end of the suspension arm is connected with the base. The other end of the suspension arm is provided with a monitor body, one end, far away from the suspension arm, of the monitor body is provided with a cutting mechanism, the suspension arm is provided with a driving motor or a hydraulic motor, an output shaft of the driving motor or the hydraulic motor is coaxially connected with one end of a transmission rod, and the transmission rod is coaxially and rotatably assembled in the monitor body; and the other end of the transmission rod is connected with the cutting mechanism. According to the invention, the cutting working surface can be effectively enlarged, the cutting maneuverability is improved, and the tunneling efficiency of the tunneling machine is improved. The invention is suitable for the technical field of tunneling in tunnel construction.

The utility model relates to the technical field of shell-and-tube heat exchangers, and particularly discloses a multi-pipe-diameter multi-helix-angle multi-strand winding pipe type heat exchanger. Comprising a shell, a middle core cylinder installed in the shell and a spiral assembly spirally wound on the outer side of the middle core cylinder in the axial direction of the middle core cylinder. The spiral assembly comprises a plurality of spiral winding tube bundle layers which are spirally wound on the outer side of the middle core cylinder in sequence; each spiral winding tube bundle layer comprises a plurality of groups of spiral winding tubes wound on the outer side of the middle core cylinder, and the outer diameters of the spiral winding tubes in each spiral winding tube bundle layer are arranged at equal intervals; one or more fluid media are arranged in the spiral winding pipes on the same layer, and one or more wall thicknesses of the spiral winding pipes are arranged and correspond to the fluid media in a one-to-one mode. The heat exchange requirement and the winding strength requirement can be effectively met, meanwhile, the use efficiency of the material can be improved, and the production and processing cost can be reduced.

The invention discloses a heterogeneous multi-robot air-ground collaborative material distribution method, and belongs to the technical field of multi-unmanned system task allocation. Comprising the following steps: determining an air-ground collaborative minimum coverage area unit, carrying out partitioning on the air-ground collaborative minimum coverage area unit, and selecting a collection and distribution center for material distribution and external placement points; carrying out optimal closed-loop sequence solution on a delivery route between the delivery point and the material delivery area to obtain a shortest path with road information; incremental updating and multi-source information fusion mapping are carried out on a delivery area through real-time collaborative environment perception of the unmanned aerial vehicle and the unmanned vehicle; performing optimal path planning based on the distribution task; based on the planned optimal path, a distribution task is completed; and through communication of the Internet of Things, a return route is planned, and a next distribution task is prepared. The unmanned vehicle and the unmanned aerial vehicle are combined, air-ground cooperative three-dimensional autonomous material distribution is achieved, and complementary advantages of large carrying capacity and long cruising ability of the unmanned vehicle and high maneuverability and three-dimensional distribution of the unmanned aerial vehicle are achieved.

The invention discloses an astronomical positioning method for a space target elongated astronomical image of a large-field-of-view space-based monitoring platform, relates to the technical field of astronomical observation, and solves the problem that the elongated astronomical image is abandoned due to incapability of target association and precise orbit determination caused by inaccurate centering of the elongated astronomical image and low precision of a positioning method of an existing monitoring platform. According to the method, an observation image is divided into 16 sub-view fields, and each sub-view field is an independent view field and is calculated by an independent processor; removing fixed stars in the observation image by adopting an adjacent frame image difference method and extracting a space target star image; secondly, describing the length and angle of the lengthened astronomical image by adopting a minimum enclosing rectangle, and constructing a degradation model; performing motion blurred image restoration on the elongated star image; error points with large errors are eliminated by adopting a mutual comparison method, and track association of the space target is completed; and finally completing precise astronomical positioning of the elongated astronomical image and the like. According to the method, the processing efficiency is greatly improved, and a large number of lengthened astronomical images which are abandoned before are fully utilized again.

The invention discloses a large-depth pressure-resistant communication antenna of an unmanned underwater vehicle and the underwater vehicle, and belongs to the technical field of underwater vehicles, the antenna comprises an antenna shell, a pressure-resistant cabin body and a fin-shaped component, the pressure-resistant cabin body is a component forming a cabin body segment of the underwater vehicle, and the fin-shaped component is a fin-shaped component. The antenna shell comprises a radial supporting part fixed to the pressure-resistant cabin and a shell part fixed to the top end of the radial supporting part, the fin-shaped component is fixed to the radial supporting part, an antenna unit is installed in the shell part, and a wireless communication function unit connected with the antenna unit is arranged in the pressure-resistant cabin. The large-depth pressure-resistant communication antenna of the unmanned underwater vehicle has the advantages of being excellent in communication quality, high in pressure resistance, optimized in size, high in space utilization rate, stable and reliable for a long time and the like, and can meet operation requirements in a deep sea environment.

The invention provides an innovative vector propulsion system of a low-altitude airship, aims to provide accurate attitude adjustment and path planning capabilities for the low-altitude airship in a complex space environment, and consists of a plurality of key components, comprising an executing mechanism, a power driving module, a vector rotating mechanism, a propeller connecting mechanism, a detecting module and a propeller control system. The core characteristic of the airship is that adjusted vector thrust can be applied to any direction in a three-dimensional space so as to respond to real-time attitude adjustment and control requirements, so that accurate vertical rising, lateral flying and rotating operation of the airship in a limited space are realized; due to the unique design, the influence of the thrust direction change on the gravity center of the airship is reduced to the maximum extent, and therefore it is ensured that the low-altitude airship keeps the stable posture, and meanwhile fine control is achieved; the system is further integrated with a set of independent control system so as to guarantee accurate output of thrust angles, meanwhile, the overall structure is light and handy, the system particularly meets the requirements of low-altitude small airships, and the maneuverability and adaptability of the system in a narrow space are enhanced.

The invention relates to the technical field of organic photoelectric materials, in particular to an acceptor material containing a cyclohexyl side chain, the structural formula of the acceptor material containing the cyclohexyl side chain is one of Y-C1 or Y-C2, and the acceptor material containing the cyclohexyl side chain is # imgabs0. On the basis of a traditional A-D-A structure with a Y series analogue as a core, a large-volume steric hindrance side chain is introduced, and a large-volume cyclohexyl group is introduced into the side chain, so that the acceptor material containing the cyclohexyl side chain is obtained. The organic small molecule acceptor material has the advantages that the steric effect is increased, the intramolecular and intermolecular interaction is adjusted, the polarizability of molecules is enhanced, the intermolecular electron orbital overlapping is promoted, the delocalization of charge transfer pathways is promoted, the energy loss is further reduced, and the efficiency is improved; the material has excellent charge transfer characteristic and good intermolecular accumulation effect, is beneficial to the improvement of charge mobility, and has better photovoltaic performance in the test of a ternary organic solar cell.

The invention discloses a bending-resistant, high-rubber and wear-resistant anti-reflection film and a preparation method thereof. The anti-reflection film comprises a base material layer, a hardened layer, a high-refractive-index layer and a low-refractive-index layer which are sequentially stacked, the hardened layer is obtained by coating the base material layer with hardened layer coating liquid and then curing the hardened layer coating liquid; the hardened layer coating liquid is prepared from the following raw materials in parts by weight: 50-80 parts of hardened resin; 10 to 30 parts of flexible resin; 5-20 parts of a modified inorganic nanoparticle dispersion liquid; 3-6 parts of a first photoinitiator; 50 to 100 parts of a first solvent; wherein the flexible resin is flexible vinyl resin which is prepared by modifying epoxy vinyl ester resin through carbamic acid ester. According to the invention, optical design, formula design, thickness design and the like are carried out on a plurality of coatings, so that the requirements of appearance uniformity, hue uniformity and strong bonding force among laminated layers of the three coatings can be met, and the anti-reflection film has excellent antifouling, scratch-resistant, rubber friction-resistant and bending-resistant properties.

The invention discloses an ultrafast motion sensing floating gate transistor based on Van der Waals heterojunction and application thereof. The floating gate transistor comprises a back gate substrate, a Van der Waals heterojunction channel layer, a source electrode and a drain electrode, the source electrode and the drain electrode are arranged on the two sides of the channel layer, the back gate substrate is heavily doped silicon, the surface of the heavily doped silicon is covered with hafnium oxide / aluminum oxide / hafnium oxide (HfO2 / Al2O3 / HfO2) used for nonvolatile light storage, and the Van der Waals heterojunction channel layer is composed of bismuth oxygen selenium-palladium selenide nanosheets used for sensing. The floating gate transistor disclosed by the invention has the capability of quickly responding to an ultraviolet-near infrared wide spectrum and non-volatile storage of light at the same time, and the sensitive spectral response range and responsivity of the photoelectric detector can be effectively improved, so that the integration of dynamic target optical signals in devices in a space domain and a time domain is realized.

A target position point is sent to an unmanned aerial vehicle through ground equipment, the unmanned aerial vehicle takes the target point as a flight target, and the unmanned aerial vehicle flies to the target point, keeps relative positions with the target and always moves along with the ground target. Therefore, the mooring multi-rotor unmanned aerial vehicle can automatically follow the vehicle platform to synchronously fly. The unmanned aerial vehicle can automatically follow the vehicle to run, so that the maneuverability and task capability of the system are improved, and task deployment and team cooperation are more flexible.

The invention provides a dual-rotor water-air amphibious unmanned aerial vehicle with a plume-like electric eel structure, which comprises a main body assembly, and the main body assembly comprises a triangular bracket, a fuselage main body, an electric eel driving mechanism, a rotary connecting piece, a U-shaped clamping groove, the plume-like electric eel structure and a load platform. According to the unmanned aerial vehicle, the line-like electric eel structures are arranged on the two sides of the fuselage main body, so that the unmanned aerial vehicle can enter and exit water without an underwater propeller or mode switching, and the structures are low in movement energy consumption, so that the unmanned aerial vehicle has the capability of working for a long time and can be flexibly switched between an air mode and a water mode; meanwhile, the system has excellent performances such as ultra-silence, high endurance and high efficiency; according to the invention, the attitude control is realized through a double-rotor structure consisting of the waterproof brushless motor, the output shaft and the folding propeller assembly and through the tilting mechanisms which are mounted front and back, the tilting mechanisms enable the rotors to deflect, different attitudes and motions can be realized through different tilting directions and tilting speeds, and the attitude stability and the motion control are enhanced.

The invention discloses a SiC FinFET device which comprises a fin body, and at least two first shielding regions are formed in a first SiC epitaxial layer at the bottom of the fin body. And the first shielding region further extends to the bottoms of the gate structures on the two sides of the fin body, so that the bottoms cover the gate dielectric layers of the gate structures. A first current expansion layer is formed between every two adjacent first shielding areas, and a first interval is formed between every two adjacent first shielding areas. And a second shielding region is formed in the fin body at the top of each first shielding region. A second interval larger than the first interval is formed between every two adjacent second shielding areas. And a second current expansion layer, a well region and a source region are formed in the fin body between two adjacent second shielding regions. The invention further discloses a manufacturing method of the SiC FinFET device. According to the invention, the fin bodies can be adopted to increase the mobility of channel carriers, the gate dielectric layer can be well protected, and the device has low specific on-resistance.

The invention relates to the technical field of LEDs, in particular to a quaternary yellow-green LED epitaxial wafer and a preparation method thereof. The quaternary yellow-green LED epitaxial wafer sequentially comprises a GaAs substrate, a GaAs buffer layer, an N-type gradient doped waveguide layer, a single quantum well active layer, a P-type gradient doped waveguide layer, a P-type self-absorption layer, a P-type transition layer and a P-type periodic current expansion layer from bottom to top. Through the design that the N / P type gradient doped waveguide layer is combined with the single quantum well active layer, the P type self-absorption layer and the P type GaP / GaAsP periodic current expansion layer, and the MOCVD technology is adopted for growth, the obtained low-brightness and high-reliability quaternary yellow-green LED epitaxial wafer structure has the advantages of being high in antistatic performance, excellent in aging performance, good in surface flatness and uniformity, high in light emitting efficiency and the like. The method has the characteristics of simple process, low production cost and raw material cost and the like, is used for replacing two-component and three-component LEDs grown by an LPE technology, and has better reliability and application prospect.

The invention discloses eye cream containing a composition capable of improving eye skin problems and a preparation method of the eye cream, and belongs to the technical field of cosmetics. The eye cream provided by the invention contains a repairing composition, and the repairing composition is prepared from the following raw materials: an acer rubrum extract, a zingiber zingiberensis extract, a dendrobium officinale extract, a North American arbor pine bark extract and an epilobium fragile extract. The repairing composition provided by the invention has the effects of resisting aging, fading wrinkles and improving the migration rate of skin cells, and the whole repairing composition is mild and non-irritant; when being applied to the eye cream, the repairing composition can effectively resist aging, lighten wrinkles, improve skin elasticity and increase the water content of cuticle. In addition, the composition provided by the invention is natural in component source, simple in preparation method and suitable for actual production.

The invention relates to the technical field of robots, and discloses a robot leg walking mechanism and a quadruped robot, the robot leg walking mechanism comprises a plurality of big arms, one side of each big arm is connected with a floating assembly, the floating assembly comprises a connecting box and an air bag, the connecting box is fixedly connected with one side of the big arm, and a placing groove is formed in the side, away from the big arm, of the connecting box; an air bag is fixedly connected into the containing groove, one side of the big arm is sequentially connected with an inflation assembly, a deflation assembly and an air injection assembly from top to bottom, and one side of the connecting box is connected with a closing assembly. According to the robot leg walking mechanism and the quadruped robot, by means of the floating assembly, the quadruped robot can keep floating in a deep water area, so that a robot body is prevented from being completely immersed in water, the risk that a camera lens is stained with water is reduced, and the quality and accuracy of real-time image transmission are ensured; therefore, a clear visual field and stable walking capability are provided for the quadruped robot, visual misjudgment or distortion can be reduced, and the accuracy and efficiency of inspection tasks are improved.

The invention discloses a medium-high temperature heat-power conversion working medium for a high-speed aircraft as well as a preparation method and application of the medium-high temperature heat-power conversion working medium. The medium-high temperature heat-power conversion working medium comprises the following components in percentage by mass: 10-90% of ammonia, 10-70% of multi-component alcohol and the balance of water, the multi-component alcohol comprises at least two of ethanol, isopropanol, ethylene glycol, n-propyl alcohol and n-butyl alcohol; and the mass of each alcohol in the multi-component alcohol is 5-40% of the total mass of the medium-high temperature heat-work conversion working medium. Ammonia, multi-component alcohol and water are combined for the first time, a double-bed catalyst is combined, physical heat absorption can be utilized, heat absorption can be enhanced through chemical reaction, the heat sink can reach 7.0 MJ / kg or above, and the cooling agent can be used for pneumatic heat absorption of a high-speed aircraft with the speed higher than 5 Mach and is high in cooling capacity and low in cost. The method is suitable for a thermal protection system of a pneumatic heating component with higher heat flux and continuous long time; meanwhile, high-temperature and high-pressure small-molecule gas is generated, thrust can be generated to do work, and the maneuverability of the high-speed aircraft is effectively enhanced.