189results about How to "Cost advantage" patented technology

The invention provides a circuit test system and method and related equipment, and the test system comprises a test mold, electronic test equipment and computing equipment, can test a plurality of circuit parameters in parallel, can complete a large number of tests in a short time for circuit boards produced in batches, can run according to a preset program, and is high in test efficiency. The test result is more accurate and stable, a high-precision test instrument can be equipped, tiny voltage and current changes can be accurately measured, the device has the characteristics of high efficiency and stability, the test cost can be reduced, defective circuit boards can be found and removed in time, defective products are prevented from flowing into the next process, the defective products are prevented from flowing out, and the rework cost is reduced. The test data can be automatically recorded and stored, subsequent data analysis and quality tracing are facilitated, and the test system has obvious advantages in the aspects of efficiency, precision, cost, data management, repeatability and the like and is suitable for large-scale and high-precision circuit board production requirements.

The invention belongs to the field of sewage treatment, and particularly relates to a preparation method and application of a biological composite carbon source, and the preparation method comprises the following steps: mixing waste beer yeast liquid and biodiesel byproducts, adding an enzyme preparation, carrying out mixing reaction, and separating out supernatant to obtain the biological composite carbon source. The biological composite carbon source disclosed by the invention is low in production cost, rich in nutritional ingredients and high in adaptability, and has long-term effectiveness, high denitrification rate and denitrification effect.

The invention discloses a mushroom yield estimation method based on three-dimensional reconstruction lossless phenotype parameter extraction, belongs to the technical field of agricultural informatization and intelligentization, and solves the problem of low mushroom yield estimation accuracy. The method comprises the following steps: performing point cloud three-dimensional reconstruction on shiitake mushrooms by using a region of interest to generate dense point cloud data; preprocessing the dense point cloud data; based on an improved CP-PointNet + + model and a clustering algorithm, segmenting mushroom point cloud, extracting multi-dimensional key phenotypic parameters of pileus diameter, thickness and stipe height, and covering main features of mushroom phenotypic information; the improved PointNet + + network comprises the following steps: adding a CBAM module to an MLP layer of the PointNet + + network, and replacing common convolution with partial convolution PConv; and taking the phenotypic parameters of the shiitake mushrooms as input variables of the neural network model, and predicting the shiitake mushroom yield. The method is suitable for phenotypic character analysis and breeding research of edible mushrooms such as shiitake mushrooms and the like.

The invention discloses a solid composite carbon source for sewage denitrification and a preparation method thereof. The composite carbon source is prepared from the following components in parts by weight: 10 to 60 parts of sodium acetate, 10 to 30 parts of glucose, 10 to 30 parts of starch, 0.1 to 2 parts of yeast powder, 1 to 5 parts of cellulose and 0.1 to 0.3 part of glycosyl hydrolase. Sodium acetate in the composite carbon source can react quickly, an instantaneous carbon source is provided, glucose and starch can be utilized by microorganisms for a long time, and durability of the carbon source is guaranteed. The invention also provides a sewage treatment method using the composite carbon source, and the method comprises the following steps: adding the composite carbon source into sewage, and carrying out denitrification treatment. The addition amount of the composite carbon source is determined based on the C / N ratio in the sewage. By adding the composite carbon source, the content of nitrate nitrogen in sewage can be effectively reduced, so that the sewage treatment efficiency is improved. The composite carbon source exists in a solid form, is convenient to store and transport, and reduces the influence on the environment. The composite carbon source not only can obviously improve the sewage treatment effect and improve the effluent quality, but also can reduce the operation cost and additional cost, and has important significance for improving the environment.

The pole frame polar plate comprises the pole frame polar plate, the pole frame polar plate is a plastic pole frame polar plate, a plurality of alkali liquor inlets are formed in the bottom of the pole frame polar plate, a hydrogen outlet and an oxygen outlet are formed in the top of the pole frame polar plate, and an inner sealing face and an outer sealing face are arranged on the pole frame polar plate in the circumferential direction of the pole frame polar plate. A plurality of metal pins are arranged in the region, positioned inside the inner sealing surface, of the pole frame pole plate and are embedded into the plastic pole frame pole plate. The plastic electrode frame and the electrode plate are formed through one-time injection molding, subsequent machining and the fixing procedure of the electrode plate and the electrode frame are avoided, the leakage risk is fundamentally eliminated, the electrode frame and the electrode plate are all made of alkali-resisting materials, high in chemical corrosion resistance and free of metal impurities, the risk of electrochemical corrosion is fundamentally eradicated, and the service life of the battery is prolonged. The integrated plastic pole plate and the pole frame greatly reduce the equipment weight and size, simplify the installation, transportation and maintenance, and have obvious cost advantages; and meanwhile, metal pins are embedded in the middle of the polar plate to ensure electron transfer.

The invention discloses a method for constructing recombinant hansenula polymorpha for efficiently producing canine serum albumin and an expression method of the recombinant hansenula polymorpha. Based on a natural sequence of a canine serum albumin gene, a codon of the canine serum albumin gene is optimized, so that the canine serum albumin gene is more suitable for being expressed in hansenula polymorpha, an optimal promoter of the sequence expressed in hansenula polymorpha is further screened, and the copy number of the canine serum albumin in hansenula polymorpha is optimized. The yield of the canine serum albumin hansenula polymorpha strain obtained by recombinant transformation can reach 0.8-0.9 g / L after 6 days of high-density fermentation production in a fermentation tank.

The invention provides an optical system of a laser radar transmitting lens. The optical system comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, an optical filter, protective glass and an image surface which are arranged in a direction from an object side to an image side. According to the invention, by reasonably using the lenses with specific shapes and structures and limiting the focal power of each lens, the field angle of the optical system is increased to 150 degrees and the relative illumination is greater than 90%, the radar detection field of view is wider and clearer, the F-theta distortion is less than 1%, the CRA is less than 1 degree, the detection distance and precision are improved, and the detection cost is reduced. According to the utility model, more accurate distance measurement data and farther detection distance can be provided, TTL is 29 mm, the size is small, miniaturization can be realized, the camera can be arranged in a vehicle, the matching of 2G3P glass and plastic enables the whole optical system to optimize high and low temperature excursion compensation, it is ensured that the lens does not have virtual focus at high and low temperatures, the cost is more advantageous, and the cost performance is higher.

The invention discloses a method for extracting lithium from brine containing sulfate radicals. The method comprises the following steps: S1, selecting brine containing sulfate radicals, filtering to remove impurities, and adjusting the pH value to 5-7; s2, enabling the brine to pass through a resin column containing an aluminum-based lithium adsorbent, and extracting lithium ions; s3, leaching the aluminum-based lithium adsorbent with water, performing countercurrent analysis, and collecting an analyzed lithium-containing liquid A; repeating the steps S2 and S3 until the adsorption capacity of the aluminum-based lithium adsorbent is reduced to 70% or below of the initial capacity; s4, soluble chlorate is used for carrying out salt top material replacement on sulfate radicals mixed in the aluminum-based lithium adsorbent, pure water analysis is carried out, and analyzed lithium-containing liquid B is obtained; and combining and analyzing the lithium-containing liquid. According to the method, the problem of performance degradation of the aluminum-based lithium adsorbent in the process of extracting the lithium from the brine containing the sulfate radicals is solved in a manner of adjusting the pH value in the front stage and replacing the sulfate radicals with the chlorine radical jacking material after adsorption, and various materials in the system can be basically recycled, so that the operation cost is fundamentally reduced, and meanwhile, the environmental protection problem caused by introduction of a large amount of salt is completely eradicated.

The utility model relates to a multifunctional spring type breathable anti-explosion valve device. The multifunctional spring type breathable anti-explosion valve device comprises a breathable valve body (8), a first diaphragm (2), a second diaphragm (7), a first spring assembly and a second spring assembly. A first ventilation hole (8.1) and a second ventilation hole (8.2) are formed in the ventilation valve body (8); the first diaphragm (2) is connected with the breather valve body (8); and the second diaphragm (7) is connected with the ventilation valve body (8) and is arranged between the first diaphragm (2) and the first ventilation hole (8.1). Compared with the prior art, the spring type ventilating explosion-proof valve device has the advantages that the second diaphragm is additionally arranged to reduce external wet air flowing into the battery pack while the requirement on large ventilation volume of thermal runaway is met, and condensation of the battery pack is improved to the greatest extent to prevent short circuit in the battery pack.

The invention provides a process for preparing lanthanum oxide by recovering lanthanum samarium slag through a nitrogen vortex separation method, which comprises the following steps: S1, distilling the lanthanum samarium slag through lanthanum thermal reaction, and then cutting into blocks for crushing; s2, the diced lanthanum samarium slag is put into a vertical compound crusher to be crushed; s3, separating metal lanthanum and samarium particles from the crushed particles through a particle winnowing machine; s4, performing precise winnowing on the lanthanum oxide and samarium oxide mixed powder to separate samarium oxide; s5, mixing the samarium oxide enrichment with a new material, and performing lanthanum thermal reaction distillation again; s6, the crushed lanthanum samarium powder is filled with nitrogen in a spiral separation powder stacking machine, and lanthanum powder is separated through vortexes; s7, the remaining lanthanum samarium powder is subjected to high-flow-rate separation, and after lanthanum powder is separated out, the lanthanum powder is returned to samarium oxide reduction production; and S8, the content of samarium in the recovered lanthanum powder is lower than 1%, and the recovered lanthanum powder can be used for lanthanum oxide electrolytic reduction to produce metal lanthanum. The method solves the problems of treatment and recovery of the lanthanum samarium slag, and has remarkable advantages in the aspects of environmental protection, cost, efficiency, product quality and the like.

The utility model relates to a detection system for a slide wire, which comprises a moving mechanism capable of moving along the slide wire; the first temperature sensor is arranged on the moving mechanism and is used for detecting the temperature of the slide wire; the camera is arranged on the moving mechanism and is used for shooting an image of the sliding contact line; the alarm device is used for carrying out alarm operation when the temperature of the slide wire is greater than a first preset temperature; a first communication connection exists between the control device and the first temperature sensor, a second communication connection exists between the control device and the camera, and a third communication connection exists between the control device and the alarm device; the control device is configured to receive the temperature of the sliding contact line from the first temperature sensor, receive the image of the sliding contact line from the camera when the temperature of the sliding contact line is larger than a first preset temperature, and activate the alarm operation of the alarm device. The utility model further relates to a transportation facility. According to the utility model, a continuous, automatic, reliable and efficient detection scheme is realized.

The utility model discloses packaging devices which are used for packaging a composite pipeline, the composite pipeline is of a hollow columnar structure, the two packaging devices are arranged and fixed to the two ends of the composite pipeline in a sleeving mode correspondingly, each packaging device comprises a supporting body, a plurality of inner supporting frames and a plurality of outer supporting frames, and the supporting body is a disc piece; the multiple inner supporting frames and the multiple outer supporting frames are arranged on the outer side of the supporting body at intervals in the circumferential direction, the inner supporting frames abut against the inner wall of the composite pipeline, and the outer supporting frames abut against the periphery of the composite pipeline, so that the packaging device is clamped on the composite pipeline. According to the packaging device for the composite pipeline, the composite pipeline in transportation can be effectively protected, and meanwhile the packaging device is simple in structure, low in cost, light in weight, capable of being repeatedly used and beneficial to environmental protection.

The invention relates to an electromechanical brake booster for a vehicle brake system, comprising: an electric motor (12); at least one linearly adjustable piston part (14); a transmission device (16), by means of which the electric motor (12) is connected to the at least one linearly adjustable piston part (14), such that a motor force of the electric motor (12) can be transmitted to the at least one linearly adjustable piston part (14) via the transmission device (16); a transmission housing component (18) which at least partially surrounds the transmission (16); and at least one pull rod (20), to which the at least one linearly adjustable piston part (14) is connected in order to guide the linearly adjustable piston part (14) by means of the transmitted motor force by means of the at least one pull rod (20); wherein the electromechanical brake booster has an intermediate plate (22, 44) which is produced as a component independent of the transmission housing component (18), the at least one pull rod (20) being fastened to the intermediate plate (22, 44) and the intermediate plate (22, 44) being fastened to the transmission housing component (18).

The invention relates to the technical field of hydrogen internal combustion engines, in particular to a device for increasing the tail gas temperature of a hydrogen internal combustion engine and enhancing pressurization and a control method thereof. Comprising the steps that an exhaust hydrogen combustion device and an electronic control unit are additionally arranged on an original exhaust manifold of an internal combustion engine, an auxiliary combustion chamber is installed on the upstream of a turbocharger, the oxygen exhaust flow is calculated through an exhaust flow sensor and an oxygen concentration sensor, the hydrogen spraying flow of a hydrogen nozzle is determined, and hydrogen-air mixed gas is ignited through a sparking plug; therefore, the tail gas enthalpy value of an inlet of the turbocharger is increased through combustion of hydrogen in the auxiliary combustion chamber, the supercharge ratio is increased, and then the inflation efficiency and the power density of the hydrogen internal combustion engine are improved.

The invention discloses a light-weight high-strength Ni-Co-based single-crystal high-entropy alloy and a preparation method thereof, the single-crystal high-entropy alloy comprises the following chemical components in percentage by atom: 45-55 at% of Ni, 15-20 at% of Co, 9-12 at% of Cr, 9-12 at% of Al, 4-8 at% of Ti, 1-2 at% of Mo, 0-1 at% of W and 0-0.1 at% of Hf, and the single-crystal high-entropy alloy comprises the following eight elements: 45-55 at% of Ni, 15-20 at% of Co, 9-12 at% of Cr, 9-12 at% of Al, 4-8 at% of Ti, 1-2 at% of Mo, 0-1 at% of W and 0-0.1 at% of Hf. The preparation method comprises the following steps: obtaining a liquidus temperature through analog calculation, and obtaining an eutectic dissolution temperature through a melting point test; the preparation method comprises the following steps: putting elemental elements Ni, Co, Cr, Ti, Mo and W into a crucible of a vacuum induction melting furnace in sequence, and pouring into a master alloy ingot; a high-speed solidification Bridgeman method and a seed crystal method are adopted to prepare a crystal grain with the orientation of 1t; 001gt, 001gt; preparing a single-crystal high-entropy alloy test bar; and the single-crystal high-entropy alloy test bar is sequentially subjected to solution treatment, first-stage aging and second-stage aging, and the light-weight high-strength Ni-Co-based single-crystal high-entropy alloy is obtained. The single-crystal high-entropy alloy prepared through the method is small in density and meanwhile has excellent room-temperature mechanical property and high-temperature mechanical property.

The invention discloses a hand electronic skin based on an ultrasonic transducer and a three-dimensional gesture reconstruction method thereof, and relates to the technical field of man-machine interaction. The hand electronic skin comprises a viscous layer, a flexible strain sensor layer, a flexible electrode, a composite electrode, a surface packaging layer and an ultrasonic transducer which are arranged on the surface of the hand skin; the flexible strain sensor layer comprises a plurality of flexible strain sensors, and each finger joint is provided with a flexible strain sensor used for independently measuring the bending angle of the finger joint. The ultrasonic transducer is partially embedded in the surface packaging layer and used for emitting ultrasonic waves. The electronic skin is mainly composed of a flexible stretchable strain sensor and a piezoelectric micromechanical ultrasonic transducer, and is simple and reliable in structure, low in manufacturing cost, free of interference of ambient light, low in time drift rate and convenient and comfortable to wear. The hand electronic skin is suitable for the fields of virtual reality, robot control, medical rehabilitation and the like, and the interaction experience and operation convenience of the user can be remarkably improved.

The invention discloses a preparation method and application of a biochar material for adsorbing 2, 4, 6-trinitrochlorobenzene, and belongs to the technical field of environmental functional materials.The preparation method comprises the steps that hydrothermal carbon is prepared, specifically, straw is washed, dried, smashed and then sieved, a straw powder product a is obtained, the product a is put into a container, distilled water is added, after ultrasonic treatment is conducted, turbid liquid is obtained, and hydrothermal carbon is obtained; heating at a set temperature to obtain a product b; washing: centrifuging the obtained product b, washing with deionized water and ethanol, and carrying out vacuum drying to obtain a product c; activating: mixing the product c with a potassium hydroxide solid, and calcining in N2 atmosphere at a set temperature to obtain a product d; and neutralization: putting the product d into a hydrochloric acid solution for ultrasonic treatment, filtering to remove the hydrochloric acid solution, washing with distilled water, and drying to obtain a biochar product e adsorbing 2, 4, 6-trinitrochlorobenzene. According to the invention, cheap wastes are directly utilized to prepare the biochar adsorption material with excellent performance, and the biochar adsorption material can efficiently adsorb 2, 4, 6-trinitrochlorobenzene and has huge application value in industry.

The invention discloses a composition containing a recombinant human nerve growth factor, application of the composition and an ophthalmic preparation. The composition is prepared from the following components in parts by weight: 0.005 to 1 part of recombinant human nerve growth factor, 20 to 70 parts of trehalose, 5 to 30 parts of mannitol and 1 to 13 parts of polyvinyl alcohol. The trehalose, the mannitol and the polyvinyl alcohol are compounded with the recombinant human nerve growth factor, so that the stability of the recombinant human nerve growth factor can be remarkably improved, and the loss of pharmacological active ingredients of the ophthalmic preparation in the preparation, transportation and long-term storage periods is reduced, so that the medication safety and the treatment effect are ensured; and the recombinant human nerve growth factor in the ophthalmic preparation is good in stability, so that the clinical requirements of patients with eye diseases can be better met.

The utility model discloses a rapid turn-off protection circuit which is characterized in that one end of a sixth resistor, a grid electrode of a second MOS tube and a grid electrode of a third MOS tube are all connected with an enabling end, the other end of the sixth resistor and source electrodes of the first MOS tube, the second MOS tube and the third MOS tube are all grounded, the grid electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the grid electrode of the third MOS tube is connected with the enabling end. The drain electrode of the first MOS tube is sequentially connected with the first resistor and the second resistor and then connected with the first pin of the first power MOS tube, the first pin of the first power MOS tube is further connected with the first pin of the second power MOS tube, the fourth pin of the first power MOS tube is connected with the fourth pin of the second power MOS tube, the drain electrode of the third MOS tube is connected with the fourth pin of the second power MOS tube through the fifth resistor, and the drain electrode of the third MOS tube is connected with the fourth pin of the second power MOS tube. The base electrode of the first triode is connected between the first resistor and the second resistor, the collector electrode is connected with the fourth pin of the first power MOS tube, and the emitter electrode is connected with the first pin of the first power MOS tube. According to the utility model, the problem that the MOSFET tube is burnt out due to slow turn-off response caused by the influence of the junction capacitance of the MOSFET tube can be effectively solved.

The invention discloses recombinant hansenula polymorpha for efficiently producing cat serum albumin and an expression method of the recombinant hansenula polymorpha. According to the method, an expression cassette of the cat serum albumin is integrated in hansenula polymorpha, and a promoter in hansenula polymorpha is optimized, so that the serum albumin is expressed by a constitutive promoter and a sucrose inducible promoter independently or in a combined manner, and the copy number of the serum albumin is further optimized; the stable and efficient expression of the cat serum albumin gene in hansenula polymorpha is successfully realized. The high-density fermentation yield of the recombinant cat serum albumin fermented by using the engineering bacteria can reach 1.7-2.2 g / L.

A power amplifier integrated starting booster circuit comprises a Bluetooth chip U2 and a power amplifier chip U4, the 46th pin of the Bluetooth chip U2 is connected with the anode of a diode D5, the cathode of the diode D5 is connected with the base electrode of a triode Q3, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected with the base electrode of a triode Q2 and one end of a resistor R26, and the other end of the resistor R26 is grounded. The 24th pin of the Bluetooth chip U2 is connected with the other end of the resistor R26 and one end of the resistor R25, the other end of the resistor R25 is connected with the sixth pin CTRL of the power amplifier chip U4, the VDD pin of the lithium battery is connected with one end of the inductor L4, the other end of the inductor L4 is connected with the anodes of the diode D6 and the diode D7, and the cathodes of the diode D6 and the diode D7 are connected with the 15th pin and the 24th pin of the power amplifier chip U4. The problem of large distortion caused by low voltage of the lithium battery is solved; and a plurality of lithium batteries do not need to be connected in series to improve the power of the power amplifier.

The invention discloses an LED packaging structure and an LED packaging method, and belongs to the technical field of chip packaging. The power supply electrode of the driving chip and the RGB electrode of the LED chip are led to the two layers of substrates respectively, amplification of the power supply electrode and the RGB electrode of the driving chip is achieved at the same time, on one hand, the size of the driving chip is enlarged in an electric connection mode, limitation on the size of the LED chip can be reduced, and the size of the LED chip can be reduced; compared with a traditional LED packaging structure, the LED packaging structure can adopt an LED chip with a larger size, so that the process mass production feasibility and the mass production efficiency can be improved; and on the other hand, a plurality of LED chips can be placed on the upper substrate, and the plurality of LED chips can be simultaneously driven through one driving chip, so that the integration level of the LED packaging structure can be improved, and the size of the LED packaging structure can be reduced.

The invention belongs to the technical field of synthesis and preparation of aluminum nitride, and discloses a controllable and extensible preparation method of a one-dimensional aluminum nitride nanowire / nanotube, which comprises the following steps: (1) uniformly mixing a solid aluminum source and a solid nitrogen source, transferring the mixture into a rotatable crucible, transferring the crucible into a tubular furnace, sealing the tubular furnace, and carrying out heat preservation for 2-3 hours; vacuumizing and then introducing protective gas; (2) under the condition that protective gas is continuously introduced, the tubular furnace is heated to a preset target temperature for a nitridation reaction, and the nitridation reaction is carried out under the condition that a crucible rotates at a constant rotating speed; and after the reaction is finished, cooling the tubular furnace and stopping the rotation of the crucible to obtain a one-dimensional aluminum nitride nanowire or nanotube product. According to the method, the solid aluminum source and the solid nitrogen source are used as raw materials, and the crucible rotation is introduced during the nitridation reaction to carry out dynamic enabling improvement, so that the single-crystal aluminum nitride nanowire or nanotube with high purity and uniform morphology can be efficiently synthesized.

The invention relates to a wheel suspension (1) for a vehicle, comprising a wheel carrier (3) on which a wheel can be mounted such that it can rotate about a wheel axis of rotation (D) relative to the wheel carrier (3); a plurality of wheel guide arms (5, 6, 7, 8, 9) which are connected to the wheel carrier (3) in an articulated manner and are used for guiding the wheel carrier (3); a bearing spring (11) which is supported on a first of the wheel links (5, 6, 7, 8, 9) and is connected to the wheel carrier (3) via the first wheel link (6), via which bearing spring the wheel carrier (3) can be supported on the body of the vehicle in a spring-supported manner; and having a vibration damper (12) which is functionally connected in parallel to the bearing spring (11) and is arranged entirely outside the bearing spring (11), by means of which the wheel carrier (3) can be supported on the vehicle body in a damped manner; wherein the first wheel link (6) is arranged on a different side (S1) from at least one second wheel link among the wheel links (5, 6, 7, 8, 9), as viewed in the vehicle longitudinal direction (14), from the wheel axis of rotation (D).

The invention relates to the technical field of new materials, and discloses a high-elasticity grouting material and a preparation method thereof.The method comprises the steps that after an acrylate mixture and triethanolamine are stirred to be evenly mixed, methyl methacrylate, styrene, vinyl trichlorosilane and N-hydroxymethyl acrylamide are sequentially added for stirring; adding an initiator and continuously stirring to promote the polymerization reaction; gradually adding heavy calcium carbonate, aluminum oxide and nano silicon dioxide, ensuring uniform distribution of the filler, adding butyl acrylate and hydroquinone, adding a defoaming agent and a dispersing agent, and continuously stirring to remove bubbles and ensure uniform distribution of the filler, so as to obtain a mixture; and pouring the mixture into a mold for curing to obtain the high-elasticity grouting material. The high-elasticity grouting material disclosed by the invention has excellent mechanical properties and durability, and is suitable for crack repair, water prevention, sealing and the like of various constructional engineering.

The invention discloses a laser spot relative position measurement-based CA type five-axis machine tool rotating shaft zero error and axis error measurement compensation method. The method comprises the following steps of S1, detection system preparation: clamping or fixing a laser pen to a main shaft; s2, the A-axis zero error is measured and compensated, wherein the A-axis zero error is defined as the angle deviation between the actual posture and the theoretical ideal posture of the execution tail end of the machine tool when the rotating shaft is set to be at the 0-degree reference position; s3, measuring and compensating a C-axis zero error, wherein the C-axis zero error is defined as the angle deviation between the actual posture and the theoretical ideal posture of the execution tail end of the machine tool when the rotating shaft is set to be at the 0-degree reference position; s4, performing measurement compensation on the deviation of the A axis-main axis rotation center line in the Y direction; s5, measuring and compensating the deviation of the C-axis-main axis rotation center line in the Y direction; and S6, performing measurement compensation on the deviation of the C-axis-main axis rotation center line in the X direction.

This invention discloses an ultra-high strength and plasticity three-dimensional multi-level hybrid heterogeneous titanium-based composite material and its preparation method. The method includes: 1. performing a flow friction coating treatment on titanium alloy powder and modified amorphous cracked carbon with high active sites; 2. performing a flow friction coating treatment on modified high active and highly dispersed boron source; 3. low-temperature short-time high-pulse current-assisted vacuum hot pressing sintering; 4. multiple non-constant rate hot deformation treatments. This invention uses modified amorphous cracked carbon with high active sites and modified high active and highly dispersed boron source as reinforcing phase precursors to sequentially coat a titanium alloy powder matrix. Combined with sintering and hot deformation treatments, a multi-level, multi-scale, and multi-heterogeneous phase structure is constructed in four dimensions to obtain a three-dimensional multi-level hybrid heterogeneous titanium-based composite material, which exhibits ultra-high strength and plasticity, with a tensile strength of 1430 MPa to 1605 MPa and an elongation of 7.5% to 9%.

The present invention discloses a method for preparing an abrocitinib intermediate, and belongs to the technical field of organic synthesis. N 2 The reaction configuration was flipped to prepare cis compound 3. Compound 2 has sufficient stability to avoid S N 1 reaction, solves the technical difficulty of constructing the chiral center, avoids the problem of using rearrangement reaction to generate isomers and urea-type byproducts that are difficult to remove. In addition, compound 3 is deprotected from the p-nitrobenzenesulfonyl protecting group under sodium thioglycolate and potassium carbonate conditions to obtain compound 4; the removal conditions are mild, and there is no need to use strong acid, strong base and heating conditions, avoiding the generation of de-Boc and other byproducts, with good chemical selectivity and high yield. The route of the present invention has high stereoselectivity and chemical selectivity, the product is easy to purify and has a high yield, and the reaction reagents are safe and easy to obtain; the reaction of each step is completed within 12 hours; the total yield and total cost have obvious advantages, and it is suitable for commercial production.

The application relates to the technical field of offshore wind power DC transmission, and discloses an offshore wind power bidirectional asymmetric feeding type DC transmission system and a control method thereof, which comprises a first conversion module, a second conversion module, a third conversion module, a switch module and an onshore conversion station, wherein the internal current flow path of the switch module is controlled, the third conversion module is used to establish an offshore collection voltage during black start, and after the black start is completed, the first conversion module and the second conversion module are connected to the system, so that the problem that an offshore wind farm cannot be black started is solved.

The present invention provides a power switch circuit device and a control method, including: a power switch circuit, a voltage detection circuit module and a main power supply; the voltage detection circuit module includes: a first voltage detection circuit and a second voltage detection circuit; the first voltage detection circuit is connected to the power switch circuit; the power switch circuit is connected to the second voltage detection circuit; the power switch circuit includes: a resistor R1, a resistor R2, a capacitor C3, a triode Q1, a triode Q2 and a triode Q3; one end of the resistor R1 is connected to the triode Q1 and the triode Q2; the other end of the resistor R1 is connected to the triode Q3; the present invention uses a battery capacitor as a backup power supply, achieving advantages in cost and volume. After the main power is off, the present invention can turn off the power supply circuit of the battery capacitor after the system completes the power-off operation to prevent over-discharge of the battery capacitor.