78results about How to "Full transmission" patented technology

The invention discloses file transfer method and device. The method includes following steps: 1, sending a file transfer request to a server by a client side; 2, receiving and responding to the request by the server; 3, receiving response results by the client side, judging whether the server accepts the request or not, if yes, executing step 4; if not, executing step 5; 4, judging whether a file is larger than 100M or not, if yes, transferring in a multithreading manner; if not, transferring in a single-thread file transfer manner; and 5, finishing transfer of the request of the client side, wherein transfer includes uploading and downloading. By the file transfer method and device, when the file is large, the multithreading transfer mode is adopted, so that a CPU (central processing unit) can be utilized to the greatest extent; when the file is small, the single-thread transfer mode is adopted, so that overmuch time consumed during switching among threads can be avoided; by adopting the different transfer modes according to different sizes of the file, file transfer efficiency of the whole file transfer method and the transfer device can be improved.

The invention provides a preparation method of a carbon-nitrogen doped ternary composite metal oxide based on a prussian blue frame material. The preparation method comprises the steps of preparing the prussian blue frame material and calcining the obtained prussian blue frame material, so as to obtain the carbon-nitrogen doped ternary composite oxide. Additionally, the invention also provides application of the prepared carbon-nitrogen doped ternary composite metal oxide serving as a negative material of a lithium ion battery. With adoption of the prepared carbon-nitrogen doped ternary porous composite metal oxide, the change of volume of the negative material in a charging / discharging process can be effectively relieved, and the electronic conductivity of the material is improved, therefore, the reversible specific capacity and the cycling stability of the material can be effectively improved; the main starting material such as the prussian blue complex can be prepared by green methods such as a microwave reaction of water or an ethanol medium, so that the preparation process is simple, and the yield is high; meanwhile, the material contains three different metals, so that the properties of the composite material can be synergetic and complementary through careful selection.

An embodiment of the invention discloses a method and a device for downloading live video resources. The method comprises the following steps. A server carries video clip information of a video file in a video file list according to a video file download request of a client-side, and the video file can be provided currently. The server sends the video file list to the client-side. The server receives a video clip data download request which carries identification information of the client-side, and the server determines which client-side the video clip data download request is from according to the identification information. According to former sending rate information of video clip data for the client-side, the server determines a bit rate of the video clip data which is sent to the client-side currently and sends the video clip data with the bit rate to the client-side. Applying the method and the device can make full use of network bandwidth to transmit video resources.

The present invention discloses an FBStream streaming medium live broadcast model based on the P2P network. The invention relates to the technical field of live broadcast of P2P streaming medium. The invention adopts a meshy topological structure which comprises a server 1 which relies a node management module 11 for coordinate the control information between the nodes and a client 2 that is composed of a data buffer zone 21, a caching mapping 22, a data scheduling module 23, a partner management and optimization module 24 and a network interface 25. The transmission of data of P2P streaming stream which has advantages of low time delay and high usage factor of bandwidth of network is realized by optimizing three aspects of node management, data scheduling strategy and partner management on the base of DONet model.

The invention discloses a tidal current energy power generation device capable of being used in a low-speed environment and relates to a tidal current energy power generation device. A main body frame, an energy collection and conversion device and a speed-up drive mechanism are arranged. The main body frame is provided with floating blocks, floating block support ribs, supporting beams, working platforms, slewing supporting bearings, supporting plates, a main shaft waterproof pipeline and a leaf blade shaft waterproof pipeline in an erecting mode. The energy collection and conversion device is provided with a front rectification cover, a rear rectification cover, a guide plate, hydraulic turbine blades and an electric generator. The speed-up drive mechanism is provided with a main shaft, a front leaf blade shaft, a rear leaf blade shaft, a main shaft upper bevel gear, a main shaft lower bevel gear, a front leaf blade shaft bevel gear and a rear leaf blade shaft bevel gear. Fluid mechanics knowledge is fully used, a rectification cover structure is used for carrying out rectification and acceleration to low-speed tidal current flowing through the leaf blades, a low-speed tidal current sea area is enabled to be suitable for carrying out power generation, meanwhile, leaf blade ways which are identical in direction and a guide vane structure are adopted, tidal current flowing through the power generation device is enabled to achieve high-efficiency conversion, and the tidal current energy power generation device capable of being used in the low-speed environment is especially suitable for carrying out high-efficiency conversion to the low-speed tidal current.

The invention discloses a system for drying sludge by virtue of diversified heat energy. The system comprises a sludge drying platform and a drying chamber body which is arranged on the sludge drying platform in a closed manner and is sealed with the sludge drying platform, wherein the drying chamber body is provided with a heat energy storage device, a gas circulation device and a sludge receiving and conveying device; the sludge drying platform comprises a sludge spreading table and a geothermal heating device arranged at the bottom of the sludge spreading table; the drying chamber body is also provided with a sludge inlet and a dry sludge outlet, the sludge inlet is connected with an external sludge conveying device, and the dry sludge outlet is connected with an external dry sludge conveying device. According to the technical scheme of the invention, the environmental pollution caused by toxic gas, generated in a sludge drying process, discharged to the atmosphere is avoided; sludge is arranged on the sludge spreading table; the sludge drying cycle is shortened and the drying efficiency is improved through the geothermal heating device at the bottom of the sludge spreading table and the gas circulation device of the drying chamber body; due to the sludge receiving and conveying device, the manual intervention in a drying process is avoided, the drying efficiency is improved, and the drying process is safe.

The invention provides a welding gun device of soldering equipment, and relates to the field of welding equipment. The welding gun device comprises an arc-shaped fixed support, a welding gun base, a lifting cylinder and a welding gun assembly. An arc-shaped groove is formed in the arc-shaped fixed support. A bolt is arranged in the arc-shaped groove. The back side of the welding gun base is connected with the bolt in the arc-shaped groove in a threaded mode so that the welding gun base can slide relative to the arc-shaped groove, and the welding gun base and the arc-shaped fixed support can be fixed into a whole by screwing the bolt. The welding gun assembly is mounted on the welding gun base in a vertical sliding mode. The lifting cylinder is mounted on the welding gun base and used for driving the welding gun assembly to slide along the welding gun base. According to the welding gun device of the soldering equipment, the welding gun base can slide relative to the arc-shaped sliding groove in the arc-shaped fixed support, and a welding gun is made to incline relative to a welded product so that tin can be fed conveniently, a welding head can be closely attached to the welded product effectively, a sufficient heat transmission is achieved, the quality and qualification rate of products are greatly increased accordingly, and pseudo soldering and soldering omission are completely eradicated.

The invention relates to the field of thermal energy and power engineering, in particular to a heat-pipe heat exchanger and a heat exchange method. The heat-pipe heat exchanger comprises a heat pipe housing, at least one radiator, at least one heat collector, a heat insulating layer and an exhaust liquid-filling port, wherein the heat pipe housing comprises a single inner space, a heat transfer medium is filled into the lower portion of the inner space, each radiator is filled with a radiating medium, the radiators are positioned on the lower portion of the inner space and immersed in the heat transfer medium, each heat collector is filled with a heat collection medium, the heat collectors are positioned on the upper portion of the inner space and above the liquid level of the heat transfer medium, the heat insulating layer warps the outer wall of the heat pipe housing, the exhaust liquid-filling port is reserved at the top of the heat pipe housing or on the upper portion of the lateral wall of the heat pipe housing, the heat transfer medium is filled into the heat pipe housing through the exhaust liquid-filling port, and gas in the heat pipe housing is exhausted through the exhaust liquid-filling port. The heat-pipe heat exchanger is simple in structure, convenient in maintenance and better in heat exchange effect.

The invention belongs to the field of composite materials, and particularly relates to a polypyrrole-based photo-thermal conversion film and a preparation method and application thereof. The preparation method comprises the steps that a chemical vapor deposition polymerization method is adopted, a basement membrane is soaked in an oxidant solution, dried and then subjected to airtight polymerization with a pyrrole monomer, and thus the photo-thermal conversion film is obtained. The chemical vapor deposition polymerization method is adopted, the preparation method has the characteristics of being simple, economic and efficient, limitation brought by a conventional electrochemical method and a liquid-phase chemistry method can be avoided, and polypyrrole can grow in situ on the surfaces of various substrate materials. The prepared film material can serve as a light absorbing body to efficiently absorb solar energy, solar energy is converted to thermal energy which is used for liquid evaporation, and good performance stability is still maintained after multiple times of cycles.

The invention relates to a method for preparing a nanocomposite material, and concretely relates to a method for preparing a three-dimensional meso-porous graphene / polyaniline composite material. Themethod comprises the following steps: 1, preparing three-dimensional graphene: mixing graphene oxide with deionized water, performing ultrasonic dispersing to obtain a graphene oxide dispersion, and performing a hydrothermal reaction on the graphene oxide dispersion in a polytetrafluoroethylene reaction vessel to obtain the three-dimensional graphene; 2, preparing three-dimensional meso-porous graphene: immersing the three-dimensional graphene in an alkaline solution, performing vacuum freeze-drying, performing an activation reaction on the dried three-dimensional graphene in a nitrogen or argon atmosphere, washing the obtained reaction product with an acid and deionized water, and drying the washed reaction product to obtain the three-dimensional meso-porous graphene; and 3, preparing thethree-dimensional meso-porous graphene / polyaniline composite material: dispersing the three-dimensional meso-porous graphene in an acidic solution, adding aniline and ammonium persulfate, and performing in-situ polymerization under an ice salt bath condition to obtain the three-dimensional meso-porous graphene / polyaniline composite material. The material can be applied to fields of supercapacitorelectrode materials, energy storage materials and heat conduction materials.

The invention discloses a shift register and a control method thereof, a display panel and a display device. The shift register comprises: a shift register; a first node control module, a second nodecontrol module and a third node control module, the first node control module transmits the voltage of the input end of the shift register to a first node in response to the conduction level of a first clock signal end, and transmits the voltage of a second level voltage end to the first node in response to the conduction levels of a second clock signal end and a third node; the second node control module transmits the voltage of a second level voltage end to the second node in response to the conduction level of the first node, and transmits the voltage of a second clock signal end to the second node in response to the conduction level of the third node and the conduction level of the second clock signal end; the voltage absolute value of the conduction level of the first clock signal endis greater than the voltage absolute value of the conduction level of the third clock signal end. According to the embodiment of the invention, the trailing problem of the output level of the shift register can be improved.

Base station and User Equipment (UE) and methods to be performed therein for communication using a dynamic transmission parameter. The method to be performed in a base station comprises scheduling of transmission resources to a UE in an OFDM symbol associated with a dynamic parameter value. The base station is assumed to be associated with a carrier where a radio frame comprises at least one OFDM symbol associated with a fixed parameter value and at least one OFDM symbol associated with a dynamic parameter value, where the parameter is a cyclic prefix, CP, or a subcarrier spacing, [delta]f. The method further comprises determining a value of the parameter based on a characteristic of a radio link associated with the UE, and applying the determined value of the parameter when communicating with the UE in the scheduled transmission resources.

The invention relates to a spirofluorene derivative type organic compound and application thereof to organic light-emitting diodes (OLEDs). The spirofluorene derivative type organic compound has the advantages that spirofluorene is in loop connection with an indole ring fusion structure through carbon-carbon double bonds, the loop connection through the carbon-carbon double bonds increases material chemical stability and avoids branch chain group active position exposure, and the whole molecule is a large rigid structure and has high triplet-state energy level (T1); the indole ring fusion structure is large in steric hindrance, less prone to rotation and stable in three-dimensional space structure, and accordingly the compound is high in glass transition temperature and molecular thermal stability; in addition, the HOMO and LUMO distribution positions of the compound are separated from each other, so that the compound has appropriate HOMO and LUMO energy level; after the compound is applied to the OLEDs, the light-emitting efficiency of the OLEDs can be effectively increased, and the service life of the OLEDs can be effectively prolonged.

The invention relates to organic compounds using fluorene as a core, a preparation method of the compounds and an application of the compounds in an organic light emission diode (OLED) device. The compounds have a following structure: the fluorene is connected with a dibenzo five-membered ring and ring structure through a carbon-carbon bond, the carbon-carbon bond connection not only improves the chemical stability of the material, but also avoids exposure of active positions of a branched chain group, and the whole molecule is a larger rigid structure and has a higher triplet state energy level (T1); the compounds have large steric hindrance, are not easy to rotate, and have a more stable stereoscopic space structure, so that the compounds have a higher glass transition temperature and molecular thermal stability; in addition, HOMO and LUMO distribution positions of the compounds are separated from each other, so that the compounds have suitable HOMO and LUMO energy levels; therefore, the compounds can effectively improve the luminous efficiency and the service life of the device after being applied to the OLED device.

In calculation of a position of a terminal (Fig. 9), there arises, when creating a delay profile (FIG. 13), a problem to select a transmission code for a sector of a base station (FIGS. 17 and 18) to create the delay profile. According to a position of a base station and a bearing of each antenna (FIG. 17) forming a sector of the base station (230), a wireless position calculation method selects a transmission code for a sector of a base station to create a delay profile (242). Under a condition that the number of delay profiles to be created is limited, each delay profile is created in consideration of the antenna bearing. Therefore, the number of base stations at mutually different positions is increased to calculate the position and precision calculation is improved (FIG. 17).

The invention discloses meteorological information acquisition equipment used by a meteorological station. The meteorological information acquisition equipment includes a control box, a first display screen, a T-shaped support and an advertisement demonstration device, the upper side of the advertisement demonstration device is fixed connected with the T-shaped support, one side of the upper side of the T-shaped support is fixedly connected with a wind direction sensor, and the other side of the upper side of the T-shaped support is fixedly connected with a wind speed sensor. The meteorological information acquisition equipment provided by the invention is novel in design, simple in structure and simple to operate, can perform wireless transmission of monitored data in real time, can perform all-weather field monitoring of numerous meteorological elements, fully utilizes solar energy to generate electricity, greatly saves resources, cannot only monitor weather, but can also demonstrate some outdoor advertisements, thus can fully utilizes resources and avoid resource waste, when used on an expressway, and can also demonstrate weather situations in real time, thereby reminding drivers, and facilitating large-scale popularization and use.

The invention relates to the technical field of gelatinization pans, and discloses a gelatinization pan used for beer production and a beer production technology. The gelatinization pan comprises a gelatinization pan body and a stirring and material discharging component, wherein a heating component surrounds the outer surface of the gelatinization pan body; the top of the gelatinization pan body is provided with a gelatinization pan cover body; a water feeding pipe is arranged on the top of the gelatinization pan cover body; one side of the upper surface of the gelatinization pan cover body is provided with a cylindrical feeding hole; a bearing installation seat penetrates through the center of the gelatinization pan cover body; the stirring and material discharging component is arranged in the gelatinization pan body; and the upper end of the stirring and material discharging component penetrates through the baring installation seat. The gelatinization pan is provided with a first scraping plate of which the position can be changed, and a second scraping plate of which the position can be changed, paste liquid attached to the inner wall of the gelatinization pan body is scraped, material discharging is clean and quick, remaining of the paste liquid can be effectively reduced, in addition, a stirring effect can be improved, cleaning is assisted, in addition, steam heating can more efficiently heat a mixture of inner raw materials and water, and gelatinization is quickened.

The invention relates to an organic compound taking fluorene as a core and application of the organic compound in an OLED (Organic Light Emission Diodes) device. The compound is of a structure that the fluorene is connected with a dibenzo five-membered ring combination structure by a carbon-carbon bond; by carbon-carbon bond connection, not only is the chemical stability of a material improved, but also an active position of a branch chain group is prevented from being exposed, and moreover, a whole molecule is of a bigger rigid structure and has a high triplet state energy level (T1); in addition, steric hindrance is great, rotation is not easy, and a three-dimensional space structure is more stable, so the compound has higher glass-transition temperature and molecular heat stability; besides, distribution positions of HOMO and LUMO of the compound are separated from each other, so that the compound has proper HOMO and LUMO energy levels; therefore, after the compound is applied to the OLED device, the luminous efficiency and the service life of the device can be effectively improved and prolonged.

The invention provides a pixel circuit. The pixel circuit employs a plurality of transmission transistors: a high conversion gain transmission transistor and one or more low conversion gain transmission transistors. The pixel circuit comprises a reset transistor, a double-conversion-gain transistor, a capacitor, the high conversion gain transmission transistor, the low conversion gain transmissiontransistor and an output unit. The output unit comprises an amplification transistor and a row selection transistor. The pixel circuit further comprises an anti-overflow transistor for controlling afull-well signal. The one or more low conversion gain transmission transistors form one or more transmission branches, which are respectively connected to a photodiode. The plurality of low conversiongain transmission transistors can be respectively connected to a plurality of transmission branches or sequentially connected to the same transmission branch. The invention further provides an imagesensor device comprising the above pixel circuit.

The invention provides an artificial tooth implant. The artificial tooth implant is composed of a body part, a neck part and an abutment, wherein the body part is a porous metal material; the porous metal material is a multi-grade-pore metal material; the multi-grade-pore metal material is composed of all grades of pore cavities which are graded according to the pore diameter size of the material and all grades of cavity walls for forming the pore cavities through surrounding; all grades of the pore cavities are mutually communicated respectively and all grades of the pore cavities are also mutually communicated respectively; the number of grades is two at least. Compared with the fusion time of a traditional artificial tooth implant with a body part which is a porous metal material with single pores, the fusion time between the artificial tooth implant and an adjacent bone tissue is remarkably shortened; the artificial tooth implant is firmly fixed on a gum so that the problems that an interface is not stable and loose are overcome.

The invention relates to a dimethyl anthracene organic compound, and application thereof on an organic light-emitting device. A structure of the compound is characterized in that dimethyl anthracene is connected with a carbazole parallel loop structure through a carbon-carbon bond; with the carbon-carbon bond connection, the chemical stability of the material is improved, and an active position ofa branch perssad is prevented from being exposed; in addition, the whole molecule is of a larger rigid structure, has a high triplet state energy level (T1), and is large in steric hindrance, not easy to rotate, and more stable in three-dimensional space structure, so that the compound has higher glass state temperature and molecular heat stability; in addition, distribution positions of HOMO andLUMO of the compound provided by the invention are separated, so that the compound has appropriate HOMO and LUMO energy levels; therefore, after the compound provided by the invention is applied to the OLED (Organic Light-emitting Diode) device, the light-emitting efficiency and the service life of the device can be effectively improved.

The invention relates to a spirofluorene derivative type organic compound and application thereof to organic light-emitting diodes (OLEDs). The spirofluorene derivative type organic compound has the advantages that spirofluorene is in loop connection with a nitrogen-containing six-membered heterocyclic structure through carbon-carbon double bonds, the loop connection through the carbon-carbon double bonds increases material chemical stability and avoids branch chain group active position exposure, and the whole molecule is a large rigid structure and has high triplet-state energy level (T1); adimethyl acridine structure is large in steric hindrance, less prone to rotation and stable in three-dimensional space structure, and accordingly the compound is high in glass transition temperatureand molecular thermal stability; in addition, the HOMO and LUMO distribution positions of the compound are separated from each other, so that the compound has appropriate HOMO and LUMO energy level; after the compound is applied to the OLEDs, the light-emitting efficiency of the OLEDs can be effectively increased, and the service life of the OLEDs can be effectively prolonged.

The invention provides a preparation method of an all-solid-state lithium ion battery composite positive electrode. The preparation method comprises the following steps of: mixing a positive electrodematerial, an inorganic solid electrolyte, a conductive agent and a binder to obtain a mixture; spraying the mixture on the surface of a base material to obtain a composite positive electrode, the temperature in the spraying process ranging from 100 DEG C to 500 DEG C; the pressure in the spraying process being 0.5-2MPa. According to the method provided by the invention, certain kinetic energy exists between the positive electrode material particles and the inorganic solid electrolyte particles in the spraying process, and under the conditions of high temperature and high pressure, the two kinds of particles contact with each other to cause micro-fusion of a contact area, so that the particles are better bonded together. When the mixed powder is rapidly sprayed on the base material, the positive electrode material and the inorganic solid electrolyte are in full contact, so that the generation of physical intervals is effectively avoided, and therefore, lithium ions can be fully transmitted, and the problem that the conductivity of positive electrode lithium ions in an all-solid-state battery is relatively low is solved.

The invention belongs to the technical field of lithium batteries, and particularly relates to a method for improving the long cycle performance of a layered positive electrode material thick electrode under high voltage. The method comprises the steps that after slurry mixing and coating are conducted, a solvent in slurry is dried, through the liquid phase-solid phase-gas phase conversion process of the solvent, the uniformity of liquid-phase slurry and the orderliness of solid-phase slurry are kept for final dried electrode components, and the low-tortuosity thick electrode with directionally-arranged pore channels is formed. On one hand, the conductive agent and the binder in the low-tortuosity electrode are uniformly distributed, and on the other hand, the construction of the lithium ion transmission pore channel is beneficial to full infiltration of an electrolyte on a pole piece and rapid transmission of lithium ions, so that a sufficient electron and lithium ion transmission network around each particle in the electrode can be effectively ensured; the uniformity of electrochemical reaction in the thick electrode is ensured, and the cracking of particles caused by the volume change of each special shape is effectively avoided, so that the long-cycle stability is improved.

The invention relates to a hydrolysis device for preparing p-toluenesulfonyl chloride, which comprises a reaction kettle, and further comprises a cleaning mechanism, a uniform dripping mechanism, a stirring mechanism and a gasoline transmission mechanism. The invention further provides a p-toluenesulfonyl chloride processing technology, which comprises the steps of step 1, producing p-toluenesulfonyl chloride; step 2, conducting a hydrolysis reaction; step 3, adjusting the reaction temperature; step 4, conducting a dissolution reaction; step 5, carrying out self-cleaning; and step 6, standingfor separation. The technical problems that when solvent gasoline is added for dissolution, stirring needs to be conducted, then a stirring piece is not beneficial to sufficient layering and later separation of a mixture, in addition, the mixture left on the stirring piece cannot be cleaned and discharged in time, and the accuracy of the next hydrolysis reaction is influenced while the accuracy ofthe hydrolysis reaction at this time is reduced are solved.

The invention discloses a tri-functional cobalt-nitrogen double-doped carbon-based photonic crystal catalyst as well as a preparation method and application thereof. The catalyst is prepared by growing a zeolite imidazolate framework structure material precursor in a silicon dioxide photonic crystal template in a confinement manner; and heating, pyrolyzing, carbonizing and removing the template inan argon atmosphere. The catalyst has a unique three-dimensional ordered honeycomb hierarchical pore structure, is a three-functional catalyst capable of simultaneously and efficiently electrocatalyzing oxygen reduction, oxygen evolution and hydrogen evolution reaction, and has good metal site dispersibility and electrocatalytic activity, and the preparation method of the catalyst is simple and easy to implement and low in cost. Therefore, the catalyst prepared by the method has a wide application prospect in preparation of clean energy devices.

The invention belongs to the field of solar photocatalytic reaction, and discloses a mass transfer enhanced bubbling fixed bed photocatalytic carbon dioxide reduction reactor and method, and the reactor comprises a reaction cavity which is in an inverted circular truncated cone shape, and the interior of the reaction cavity is hollow to form a reaction space; the quartz light window is mounted at the top of the reaction cavity; the gas inlet base is mounted at the lower part of the reaction cavity; and the bubbling bed is arranged between the lower end of the reaction cavity and the upper end of the air inlet base. Compared with a traditional powder suspension system photocatalytic reaction system, the reactor has the advantages that the mass transfer performance of a catalyst interface is fully improved, the CO2 reduction reaction of the interface is always in a sufficient state of protons, electrons and CO2 molecules through regulation and control of a three-phase interface while efficient light absorption is achieved, and the activity of the CO2 reduction reaction of a solution system is effectively improved.

The invention discloses a high-resistance flexible biological pressure sensor, and belongs to the field of a biological pressure sensor. The high-resistance flexible biological pressure sensor comprises a flexible absorption layer (1), a high elastic body layer (3) and a substrate layer (2), wherein the flexible absorption layer (1) is in complete contact with a flexible biological surface, an electrode A is arranged in the flexible absorption layer (1), an electrode B is arranged in the substrate layer (2), the high elastic body layer (3) comprises hydrogel, a nanotube tree is arranged in thehydrogel, comprises conductive nanotubes with different diameter order of magnitudes and is provided with a first branch (41), at least two groups of second branches (42) and at least one group of third branch (43), the at least two groups of second branches (42) are arranged on the first branch (41), the at least one group of third branch (43) is arranged on the second branches (42), the third branch (43) is connected with the electrode A, and the first branch (41) is connected with the electrode B. The invention relates to the biological pressure sensor used for measuring pressure with highaccuracy according to the resistance distance change of the multi-stage nanotube tree.

The invention provides a preparation method of a heat dissipation layer of a heat sink as well as a heat sink. The preparation method comprises the following steps: cleaning the surface of a heat sink, and placing the cleaned heat sink in a vacuum high temperature box; filling the vacuum high temperature box with methane, and judging whether gas in the vacuum high temperature box meets heating reaction conditions; if yes, heating the vacuum high temperature box, so as to control the methane to be heated and decomposed into carbon and hydrogen; performing cooling and pressure relief on the vacuum high temperature box, so as to control the carbon to adsorb graphene and form a graphene heat dissipation layer, and judging whether the graphene heat dissipation layer meets carbon adsorption completion conditions; and if yes, taking out the heat sink. The preparation method is designed by adopting a method of generating a carbon source by heating and decomposing the methane, so that the generated graphene can be effectively and directly bonded with the surface of the heat sink, other materials like adhesive do not exist in the middle, heat of the heat sink can be fully transferred onto the graphene heat dissipation layer, and heat dissipation effect of the heat sink is improved.