33results about How to "Address stress" patented technology

The invention discloses an ultrafast laser partition impact strengthening method and device for a thin-wall covered edge of a composite blade. According to the method, the surface of the thin-wall covered edge is strengthened by utilizing the characteristics of instantaneous high pressure of shock waves induced by ultrafast laser and accurate and controllable propagation depth, and meanwhile, according to the thickness characteristics of different areas of the covered edge, laser with different pulse widths is selected to carry out partitioned strengthening treatment, so that accurate regulation and control of a surface residual stress field are realized on the premise of inhibiting deformation; the problem of cooperative control of surface strengthening deformation and a stress field of the thin-wall edge covering structure is solved. According to the thickness characteristics of different areas of the edge covering structure, based on the principle that the shorter the laser pulse width is, the shallower the shock wave propagation depth is, the shallow the depth of a residual stress field influence layer is and the edge covering structure is not prone to deformation, a femtosecond / picosecond pulse width laser combined shock peening method is provided, and femtosecond laser shock is adopted in a thin-wall area; femtosecond laser or picosecond laser with relatively long pulse width is adopted for impact in a wall thickness area, and precise regulation and control of a surface stress field are achieved on the premise of restraining thin-wall wrapping edge deformation.

The invention relates to a phase shift mask substrate and a dynamic magnetron sputtering preparation method thereof, a MoSi-based gradient film layer is continuously and dynamically deposited on the substrate, and the method comprises the following steps: carrying out first-stage deposition on the substrate by adopting a molybdenum-silicon alloy target so as to form a transition layer; carrying out second-stage deposition on the transition layer to form a main body functional layer through deposition; and third-stage deposition is carried out on the main body functional layer to form a surface modification layer through deposition, and the MoSi-based gradient film layer is obtained. The invention provides a one-step sputtering deposition method capable of dynamically and accurately regulating and controlling, so that the inherent contradiction between the performance and the stress of a single-layer uniform film is fundamentally solved, and the complexity and the uncertainty of a traditional multi-step process are avoided.

This invention relates to the field of shock waveguide technology and discloses a spring electrode shock waveguide, comprising a slender carrier and a balloon. The space formed between the balloon and the carrier is an annular channel for fluid to enter and achieve inflation. First, the electrode in the guide tube is designed as a spring-type spiral structure and wound around the surface of the carrier, which can provide good electrical contact and make the electrode have excellent ductility, solving the problem of large stress on the electrode during the deformation of the balloon under fluid compression. Through the design of a first support mechanism and a second support mechanism, the first support mechanism is connected between two adjacent outer walls of the electrode, providing axial support force for the electrode, and the second support mechanism is connected between the inner wall of the balloon and the outer wall of the electrode, providing radial support force for the electrode. This reduces the pressure on the electrode when the internal pressure of the balloon increases and the balloon expands, further solving the stress problem of the electrode during the deformation of the balloon.

The utility model relates to a connecting component for connecting different square tubes, which comprises a lantern ring piece sleeved on a thin square tube, and the lantern ring piece is connected with the front end or the rear end of a thick square tube; during use, the thick square tube and the thin square tube are connected and fixed together through the lantern ring piece. The lantern ring piece is provided with a plurality of first connecting holes used for being connected with the thick square pipes, the thick square pipes are provided with second connecting holes corresponding to the first connecting holes, and the first connecting holes are connected with the second connecting holes through connecting pieces. At least one first connecting hole is located in the top of the lantern ring piece, and at least one first connecting hole is located in the bottom of the lantern ring piece. The first connecting holes and the second connecting holes are pin holes, the connecting pieces are pins corresponding to the pin holes, and therefore the thick square pipe and the thin square pipe are hinged. The connecting mode provided by the product is efficient and reliable, installation is convenient, the existing problem that square tubes made of metal and other materials must be connected through welding is solved, and meanwhile the problem that stress is generated due to temperature change between the cross beam and the stand column which are matched with the square tubes is solved.

This utility model relates to the field of bridge construction technology and discloses a support device for the steel-concrete composite section of a cable-stayed bridge tower. The device includes: several embedded parts, with anchor rods anchored into the bridge deck at the lower end and horizontal support plates at the upper end; two or more vertical supports, including several columns, beams, and diagonal braces. The columns are vertically arranged, with their lower ends connected to the support plates and their upper ends equipped with horizontal mounting plates. The top and bottom ends of adjacent columns are connected to the beams, and several diagonal braces are arranged between adjacent columns; a transverse connecting rod, with both ends connected to two adjacent vertical supports; and a leveling bracket, with its upper end fixedly connected to the lower surface of the steel-concrete composite section and its lower end being a horizontal connecting plate opposite to the mounting plate. This support device for the steel-concrete composite section of a cable-stayed bridge tower can ensure the stability of the steel-concrete composite section during construction, guaranteeing construction accuracy.

The invention relates to the technical field of unmanned aerial vehicles, and discloses a four-axis eight-rotor heavy-load unmanned aerial vehicle which comprises an unmanned aerial vehicle body, the unmanned aerial vehicle body comprises a carbon fiber upper clamping plate, a carbon fiber middle clamping plate, an aluminum alloy bottom plate, four carbon tube walls and two foot stools, and battery mounting openings are reserved in the carbon fiber upper clamping plate and the carbon fiber middle clamping plate; the four carbon tube walls are connected between the carbon fiber upper clamping plate and the carbon fiber middle clamping plate through aluminum alloy tube clamps, each aluminum alloy tube clamp comprises a tube arm clamping plate, and the tube arm clamping plates are fixedly connected with the carbon tube walls through bolts. The four-axis eight-rotor coaxial layout is adopted, compared with a traditional heavy-load unmanned aerial vehicle needing six or eight independent vehicle arms, the wheelbase of the unmanned aerial vehicle is remarkably shortened, the overall structure is more compact, and the size of the unmanned aerial vehicle is greatly reduced on the premise that powerful power of the eight rotors is guaranteed through the design; and the device is more convenient to transport and deploy in a complex and narrow working environment.

The invention relates to the field of aircraft large component assembly, and discloses a large component flexible unloading method and system based on force value feedback control, and the flexible unloading method specifically comprises the steps: installing a three-dimensional force sensor on a numerical control positioner, calibrating the direction of the sensor, and setting a force value threshold value; after a lifting rope is installed at the lifting point position of the large component, the lifting rope is lifted, and the lifting rope is stressed; determining a descending sequence of Z axes of the positioners according to the mathematical model of the large component; the Z axis of the positioner is sequentially descended according to the sequence, in the descending process, the force borne by the positioner is monitored, when the force values in the X direction and the Y direction exceed threshold values, the Z axis stops descending, the X axis and the Y axis of the numerical control positioner are moved through a force feedback control algorithm, and after the numerical value of the force sensor reaches a target value, the Z axis of the positioner continues to be descended; and the ball head of the large component is separated from the ball socket of the positioner. The problems of stress pulling, extrusion and the like generated in the unloading process of the large component are solved, and the risk that the large component and the positioner are damaged is avoided.

The utility model relates to the field of building decoration, in particular to a connecting component for connecting angle steel and a steel square tube, which comprises a connecting piece, the connecting piece is detachably connected with the top surface and the left side surface of the angle steel, and the front end or the rear end of the connecting piece is connected with the front side surface or the rear side surface of the steel square tube; during use, the steel square tube and the angle steel are connected together through the connecting piece. The product is simple in structure and convenient to operate, assemble, disassemble and maintain, the special connecting pieces made of aluminum alloy and the steel pins are adopted for achieving hinged connection of the angle steel and the steel square pipe, the connecting mode provided by the product is efficient and reliable, and installation is convenient; the product solves the problem that the angle steel and the steel square tube must be connected by welding, and also solves the problem that stress is generated between the cross beam and the stand column due to temperature change. The product is simple and convenient to operate, safe and reliable, replaces the existing welding connection mode with heavy problems, and improves the work efficiency and the construction quality.

This invention provides a diamond thin-film battery and a method for preparing a diamond thin film. The method involves providing a single-crystal diamond substrate, which includes a first region, a second region, and a third region. The single-crystal diamond substrate is divided into an intrinsic layer and a highly doped P-type epitaxial layer, with the boundary between the intrinsic layer and the highly doped P-type epitaxial layer located within the first region. Carbon ion implantation is performed on the second region to form an amorphous carbon layer. After forming the amorphous carbon layer, it is annealed under vacuum conditions to modify the amorphous carbon layer into a graphite layer. After forming the graphite layer, a first diamond layer is deposited on the surface of the third region. A second diamond layer is deposited on the surface of the first diamond layer. After forming the second diamond layer, the graphite layer is electrochemically etched until it is removed, thereby peeling off the single-crystal diamond substrate of the first region to form a diamond thin film, resulting in a large-size and ultrathin diamond thin film.

The application discloses a kind of biocompatible materials and preparation method for bionic porous intervertebral fusion cage, belong to intervertebral fusion cage material technical field.A kind of biocompatible materials for bionic porous intervertebral fusion cage, by weight parts includes the following components: polyether ether ketone 65-80 parts, modified functional filler 15-25 parts, hydroxyapatite 8-12 parts, flow modifier 0.5-1 part;The modified functional filler is graphene oxide coated modified barium titanate functional filler.By introducing surface conductive modified nano piezoelectric ceramic particles, realize the effective conversion and transmission of mechanical stimulation to bioelectric signal, this microstructure design makes the insulating polyether ether ketone matrix possess the electric activity of simulating natural bone stress-electric signal response mechanism, so as to be favorable to activate osteoblast activity and promote bone integration of implant interface.

The present invention relates to the field of thin film materials, and provides a patterned low internal stress high reflective layer and a preparation method and application thereof, wherein the high reflective layer comprises γ-Al 2 O 3 n(Si / Ni) layer, Cr layer, cap layer, and patterned reflective layer on the substrate; the n(Si / Ni) layer is composed of n cycles of Si layer and Ni layer alternately deposited, and the alternating cycle n is 30-60; the average thickness of the Si layer is 15-40nm, the average thickness of the Ni layer is 3-8nm, and the average thickness ratio of the Si layer to the Ni layer is 5:1; the bottom layer of the n(Si / Ni) layer is a Si layer and is adjacent to the γ-Al 2 O 3 The substrate is connected, and the top layer is a Ni layer. The present invention adopts a multi-layer composite structure design to achieve high reflectivity, low internal stress, low defect density and chemical stability, solving the problems of high internal stress and high defect density in traditional high reflective layers, and can be applied to photolithography masks, optical imaging and sensor fields.

The invention provides an anode rotor thermal radiation coating and a preparation method and application thereof, and belongs to the technical field of metal surface treatment.The anode rotor thermal radiation coating comprises a bonding layer, a stress slow release layer and a thermal radiation layer which are sequentially stacked on the surface of an anode rotor base body; the bonding layer comprises a Ni layer, the stress slow release layer comprises a metal-carbon composite layer, metal elements in the metal-carbon composite layer comprise Cr and / or Ti, and the heat radiation layer comprises a graphite-like carbon material layer. According to the anode rotor coating, the problem of internal stress of the coating is effectively solved, the heat conduction and vacuum heat dissipation performance of the coating is improved, under the working condition of high-temperature thermal cycle of an anode rotor, the coating does not release gas and does not contain volatile substances, the coating keeps good compactness and bonding strength, and therefore the stability of the anode rotor under the thermal shock working condition is effectively improved, and the service life of the anode rotor under the thermal shock working condition is effectively prolonged.

The invention belongs to the technical field of high-power laser films, and relates to a high-threshold high-stability laser film for realizing base-film integration based on continuous gradual change of refractive index, the film structure is S / L1L2L3 / A, S represents a substrate, L1 represents a transition layer between the substrate and L2, L2 represents a function realization layer with continuous gradual change of refractive index, L3 represents an impedance adaptation layer between L2 and an incident medium, and A represents an impedance adaptation layer between L2 and an incident medium. A represents an incident medium. According to the base-film integrated intense laser thin film based on continuous gradual change of the refractive index, planarization treatment is carried out on defects of the base, a double-region co-sputtering preparation method is adopted for the L1 layer and the L2 layer, continuous gradual change of the refractive index from the base to an incident medium is achieved, and different optical function requirements are met. According to the integrated film, the problem of stress mismatching caused by thermal expansion coefficient difference between the substrate and the film layer and between different layers in the film layer is effectively solved, a sudden change interface between materials is eliminated, the jump characteristic of a discrete interface of a traditional film is avoided, and the laser damage threshold and stability of the film are improved.

The embodiment of the application provides a kind of based on sensor's winding tube heat exchanger performance test method and system, it is related to winding tube heat exchanger performance test technical field, method includes by sensor obtains the surface temperature distribution data of winding tube heat exchanger outer wall to determine heat exchange condition, based on external heat exchange condition, preset winding tube heat exchanger's structure parameter and the thermal physical property of winding tube material, obtain the heat transfer state in each local area in winding tube heat exchanger interior and calculate the local heat transfer coefficient of each local area in winding tube heat exchanger interior;According to the local heat transfer coefficient of each local area and the preset reference coefficient value, obtain the distribution state of winding tube heat exchanger interior scale formation and calculate the thermal stress of winding tube heat exchanger interior structure to judge the potential damage risk of winding tube heat exchanger interior structure.The application can improve the safety, reliability and energy efficiency evaluation accuracy of winding tube heat exchanger operation.

The embodiment of the invention provides a deep peak regulation anti-fatigue control method and system for a solid waste-based phase change heat storage material. The modular heat storage alternating system is constructed, the temperature state of the solid waste-based phase change heat storage material in each heat storage unit is monitored in real time, the real-time fatigue accumulated damage value of the heat storage material is calculated based on the temperature state, and then the fatigue of the heat storage material is calculated according to the damage value and the preset fatigue limit threshold value. And a heat charging and discharging scheduling strategy including load reduction, rotation or quit operation is intelligently executed. Through the synergistic effect of three levels of system architecture, state perception and intelligent decision, the problems of thermal stress accumulation and fatigue damage of the solid waste-based phase change heat storage material under the working conditions of deep peak regulation and frequent start and stop are effectively solved, the operation stability and reliability of the heat storage system are remarkably improved, and the overall service life of the heat storage system is remarkably prolonged; and meanwhile, active management and predictive maintenance of the health state of the material are realized.

The application relates to the technical field of optical films, in particular to a wavelength 190-230 nm metal dielectric enhanced reflection film and a preparation method thereof. The metal dielectric enhanced reflection film comprises a substrate, a main reflection layer and a plurality of dielectric enhancement layers. The main reflection layer is an Al layer. The dielectric enhancement layers are alternately stacked by MgF2 layers and Al2O3 layers. The number of dielectric enhancement layers is not more than 3. The physical thickness of the Al layer is 180+ / -2% nm. The physical thickness of the MgF2 layer is 26.43+ / -2% nm. The physical thickness of the Al2O3 layer is 36.65+ / -2% nm. In the MgF2 layer, the evaporation rate of MgF2 is 0.8+ / -0.1 nm / s. In the Al2O3 layer, the evaporation rate of Al2O3 is 0.5+ / -0.05 nm / s. The metal dielectric enhanced reflection film has stable high reflectivity in the 190-230 nm wavelength band, high compactness and firmness between the film layers, and good durability.

The utility model discloses a detachable safety net hook which is used for being installed on a steel beam and comprises a connecting plate and a net hanging piece fixedly arranged on the connecting plate. First through holes are formed in the connecting plates and the steel beams, and the connecting plates and the steel beams are detachably connected through first bolts and first nuts; the net hanging piece is of a U-shaped structure and comprises a first side wall and a second side wall which are oppositely arranged. The first side wall is fixedly connected with the connecting plate; the second side wall is detachably connected with an anti-disengaging piece, and the anti-disengaging piece is used for sealing an opening in the upper end of the net hanging piece. The detachable safety net hook provided by the utility model is detachably connected with the steel beam, so that the detachable safety net hook is easy to mount and dismount, and the problem of material waste is avoided; meanwhile, safety net unhooking can be avoided, and construction safety is guaranteed.

The invention discloses a strain fine tuning device and method for a high-temperature strain fatigue extensometer, the extensometer comprises a first high-temperature ceramic rod and a second high-temperature ceramic rod which are distributed up and down, and the strain fine tuning device comprises a clamping mechanism, comprising a first support used for being matched with a first high-temperature ceramic rod and a second support used for being matched with a second high-temperature ceramic rod, and the first support is rotationally connected with the second support; and the adjusting mechanism is used for mounting the clamping mechanism and driving the first bracket and the second bracket to relatively swing by a preset angle based on a hinge point between the first bracket and the second bracket so as to act on the first high-temperature ceramic rod and the second high-temperature ceramic rod respectively. The relative angle of the first support and the second support which are rotatably connected is slightly adjusted by the adjusting mechanism so as to act on the first high-temperature ceramic rod and / or the second high-temperature ceramic rod, so that strain fine adjustment of the extensometer in a high-temperature environment is realized, stress response distortion and average stress deviation caused by thermal expansion are solved, and life deviation is avoided.

The application discloses a hot forging process for a 7-series aluminum thin material product with a thick-thin gap structure. The application introduces a new process path of "pre-fabricated compensation deformation and partition collaborative control", effectively solves the problem of shear stress concentration and cracking at the junction caused by the mismatch of deformation capacity of the thick-thin area of the aluminum thin material in the background technology, and provides a systematic solution for the limit thin-wall forging of the 7-series aluminum. The stability of the extreme thin-wall structure in the forming and phase change process is ensured, so that the 7-series aluminum can be reliably forged to about 0.5mm thickness without cracking.

The invention discloses an equipment transportation vibration fatigue evaluation method and system considering structural nonlinearity, a storage medium and a terminal, and belongs to the field of equipment transportation vibration fatigue analysis, and the method mainly comprises the steps: carrying out the quick calculation of key point response through a modal synthesis method condensation model, and determining a fatigue danger structure; equipment vibration load spectrums of multiple transportation modes are determined according to a vibration test control strategy with valley control or response limit values; establishing an equation of external load and dangerous section stress by considering structural nonlinearity; accumulative damage is obtained through a three-interval method and a maximum envelope method, and whether the equipment design state meets various transportation vibration environment requirements or not is evaluated. According to the method, the problems of equipment load spectrum analysis and stress amplitude and cumulative damage calculation of a nonlinear fatigue dangerous structure in various transportation environments are solved, the cumulative damage of the fatigue dangerous structure of the equipment can be quickly obtained, and the adaptability of the equipment in various transportation vibration environments can be evaluated.

This invention discloses a decorative strip, an injection molding device, and an injection molding method, relating to the field of hot runner injection molding technology. The device comprises an injection molding machine main unit and a mold system integrated within the main unit. The injection molding machine main unit includes a front mold section, a rear mold section, a hot runner section, and an ejection module. The front mold section, the rear mold section, and the hot runner section all include temperature sensor arrays, pressure sensor arrays, and micro-pressure sensors integrated inside the mold, distributed within the hot runner system and the mold cavity. The ejection module includes a high-speed industrial camera and a laser scanner located at the ejection station. The mold system includes a decision module and a coordination module. The decision module is equipped with a real-time data stream based on a multi-source sensing module and an adaptive cooling control system linked to the ejection module. The multi-source sensing module, the central decision module, and the coordination execution module are interconnected via a data bus to form a closed-loop control circuit, achieving adaptive optimization of parameters throughout the injection molding process.

The application is suitable for the anchor bolt processing technical field, and provides a special equipment for anchor bolt processing, which comprises a table plate, a main clamping mechanism is arranged on the top of the table plate, an auxiliary clamping mechanism is arranged on the inner wall of the table plate, a tapping machine is installed at one end of the table plate, an auxiliary limiting mechanism and a bending assembly are arranged at the end of the table plate away from the tapping machine, a pad piece is fixedly connected to the top of the table plate, and a plurality of bases are fixedly connected to the bottom of the table plate at equal intervals; wherein the main clamping mechanism comprises a main frame seat fixedly connected to the table plate; through the setting and cooperation of the main clamping mechanism, the auxiliary clamping mechanism, the tapping machine, the auxiliary limiting mechanism, the bending assembly and the pad piece, each mechanism on the table plate is coupled through spatial layout and function, and an automatic processing line of "one-time clamping and multi-sequence transfer" is constructed, so that the problems of high-frequency disassembly and precision attenuation caused by process switching of traditional equipment are fundamentally solved.

This invention discloses a multi-directional rough milling process for an automotive reducer housing and the housing itself, belonging to the field of automotive technology. The process includes: artificially aging the housing; selecting at least two areas on the edge of a preset area of ​​the main positioning datum surface of the housing to create auxiliary positioning holes; grinding an auxiliary positioning datum surface on the housing; placing the housing on a support substrate using the auxiliary positioning datum surface and auxiliary positioning holes as positioning references; using a clamping mechanism to simultaneously clamp the housing at multiple points, avoiding thin-walled areas of the housing; using a machining equipment with an A-axis rotary table, milling the main positioning datum surface in the preset area of ​​the main positioning datum surface using the auxiliary positioning datum surface as a reference, and then milling the side surface of the housing using the main positioning datum surface as a reference; after the flatness of the main positioning datum surface meets the requirements, performing low-temperature stress release treatment. This application establishes a complete process flow from pretreatment, positioning and clamping, multi-directional rough milling, dynamic control to detection and stress release.

The utility model relates to battery technical field discloses a lithium battery oven heating plate, including substrate, the one side surface of substrate is equipped with heating film, heating film includes mould body and is embedded in the heating element of mould body and is arranged in continuous circuit, the distribution density of heating element presents increasing setting along the central region of mould body to edge region, the one side of heating film away from substrate is equipped with heat conduction layer, and heat conduction layer includes multiple heat conduction parts that are arranged in interval, the utility model discloses through heating film can be pertinence compensation oven edge heat loss, and the temperature gradient is weakened from the heat source distribution level, and the heat conduction layer of interval arrangement further realizes the uniform conduction of heat, and the heating uniformity is greatly promoted, guarantees the battery capacity consistency and cycle life, the present application significantly improves temperature uniformity and reduces energy consumption, solves the problem that traditional heating plate thermal stress cracks and edge heat dissipation is too fast, is applicable to large -scale lithium battery drying process.

The utility model relates to the technical field of wood strip processing, and disclose a kind of building house building wood strip cutting device, including support rack, support rack is equipped with support movable frame and wood strip cutting component, drive component is equipped between support rack and support movable frame, wood strip clamping fixed structure is equipped on support movable frame.The building house building wood strip cutting device, through the sliding cooperation of first clamping plate and second clamping plate, the interval between the two can be flexibly adjusted, to meet the preliminary clamping needs of different length wood strips;And the right-hand thread and left-hand thread design of adjusting screw rod can be moved away or opposite, effectively clamping different thickness shape wood strips is realized, the clamping design of clamping groove and plane auxiliary clamping plate, further expand the clamping mode, according to the actual shape and clamping demand of wood strip, plane auxiliary clamping plate or arc clamping strip is flexibly selected and used, greatly improve the adaptability of device to various shape wood strips.

The invention relates to a method for connecting graphite and a transparent material, in particular to a method for connecting graphite and a transparent material through ultrafast laser. The invention aims to solve the problems that the connection between graphite and a transparent material is difficult, and large size and light weight cannot be realized. The method comprises the following steps: pretreating graphite and a transparent material; fixing and placing the graphite and the transparent material; determining a focus position; and ultrafast laser connection. The method is used for ultrafast laser connection of the graphite and the transparent material. Graphite and a transparent material are connected and then used for equipment such as a fast reflecting mirror, the method is proposed for the first time, and the method is initiative. The ultrafast laser connection of the graphite and the transparent material meets the production requirement of light weight, the production requirement of large-size components is met, and the light transmission of the transparent material is not damaged.

This invention discloses a 2P2M wafer-level packaging structure based on a PI insulating layer, relating to the field of semiconductor technology. It includes a wafer substrate layer, the top surface of which is coated with a first polyimide insulating layer. A first UBM layer is formed on the top of the first polyimide insulating layer via physical vapor deposition. A first metal interconnect layer is formed on the top of the first UBM layer via electroplating. A second polyimide insulating layer is coated on the top surface of the first metal interconnect layer. A second UBM layer is formed on the top of the second polyimide insulating layer via physical vapor deposition. This invention, by employing a specially formulated photosensitive PI material, optimized interface processing technology, and an innovative stepped curing method, effectively solves the stress management and reliability problems of multilayer structures while increasing interconnect density. This technology is particularly suitable for advanced packaging applications requiring high I / O density, excellent high-frequency performance, and long-term thermal stability.

The utility model relates to a high withstand voltage structure piezoresistor, which comprises two core bodies arranged up and down in a packaging structure, a partition plate is arranged between the two core bodies, the partition plate is used for transmitting heat dissipated by the core bodies, heat transfer parts are formed on two sides of the partition plate, a heat dissipation assembly is arranged on the packaging structure corresponding to the heat transfer parts, and the heat dissipation assembly is used for heat dissipation of the core bodies. The heat dissipation assembly is connected with the heat transfer part through the heat conduction plate, and heat dissipated by the core body sequentially passes through the partition plate, the heat transfer part, the heat conduction plate and the heat dissipation assembly to enter the packaging structure to be discharged. According to the piezoresistor with the high voltage-withstanding structure, an efficient heat conduction path is formed through the partition plate and the heat transfer part in combination with the heat conduction plate and the heat dissipation assembly, and heat generated by the core body is transversely conducted to the heat transfer part through the partition plate, then is transferred to the heat dissipation plate and the heat dissipation columns through the heat conduction plate and finally is discharged through the heat dissipation columns. The thermal stress accumulation and thermal breakdown risks caused by an unsmooth heat dissipation path of a traditional stacked structure are solved, the heat dissipation efficiency is improved, and long-term stable operation of the device is ensured.

This utility model belongs to the field of hydropower station construction technology, specifically relating to a novel compressive structural joint for high concrete-faced rockfill dams. It includes a compressive concrete face and a T-shaped concrete cover plate, both formed by two-stage casting, with the T-shaped cover plate cast on top of the compressive concrete face. A waterstop is installed at the bottom between the compressive concrete face and the T-shaped cover plate; the upper part of the waterstop is filled with asphalt-impregnated fir board, and asphalt felt is placed between the cast surfaces of the compressive concrete face and the T-shaped cover plate. This novel compressive structural joint, through its innovative double-joint design and the filling of the joint with asphalt-impregnated fir board—a compressible filler—effectively absorbs the axial deformation of the high concrete-faced rockfill dam, significantly reducing the horizontal compressive strain of the face and fundamentally avoiding the problem of face crushing failure due to excessive compressive stress.

The application discloses a kind of anti-expansion silicon-based negative pole and preparation method thereof, from inside to outside including foil, lithium supplement layer attached to both sides of foil, silicon-based active material layer attached to the outside of lithium supplement layer, amorphous carbon layer attached to the outside of silicon-based active material layer and the graphite layer of outermost side;The foil is porous foil, and the hole of porous foil is filled by lithium supplement layer;The thickness of amorphous carbon layer is 20-100 μm, and the area density of amorphous layer is 0.2-5 times of the area density of silicon-based negative pole coating.