66results about How to "Clear steps" patented technology

The application discloses a preparation method of a sodium ion battery hard carbon negative electrode material based on step-by-step synergistic regulation, and comprises the following steps: S1, biomass pretreatment; S2, low-temperature pre-carbonization to obtain biomass pre-carbonized carbon; S3, physical activation: the pre-carbonized carbon is placed in an activation atmosphere to perform medium-temperature activation, and biomass activated carbon is obtained; S4, high-temperature carbonization: the biomass activated carbon is placed in an inert atmosphere to perform high-temperature carbonization, and a hard carbon intermediate is obtained; S5, chemical vapor deposition coating: the hard carbon intermediate is placed in a mixed atmosphere of a coating carbon source and an inert gas to perform chemical vapor deposition coating, and a surface-coated biomass hard carbon negative electrode material is obtained. The application can realize a higher closed pore volume at a milder temperature, and the synergistic regulation pore forming mode of activating and forming pores first and then high-temperature closing pores also avoids the insufficient closed pores caused by single high-temperature treatment.

The invention belongs to the technical field of petroleum well logging, and discloses a method for eliminating array induction direct coupling signals, which comprises the following steps of: calibrating the unit thickness change of an adjusting piece and the quantitative contribution of each receiving coil direct coupling signal through electromagnetic simulation modeling and an underground environment equivalent experiment; the target thickness is solved and replaced through a linear correction model, closed-loop calibration is matched to enable a direct coupling signal to approach a preset threshold value, based on array induction logging, an existing three-coil system structure is difficult to thoroughly offset the direct coupling signal due to machining errors, useful signal extraction is seriously disturbed, the method does not need to modify a core structure of an instrument, operation is easy and convenient, adaptability is high, and the method is suitable for large-scale popularization and application. Direct coupling signals are eliminated accurately and thoroughly, the measurement accuracy of the stratum conductivity is effectively improved, and reliable data support is provided for oil and gas reservoir identification and evaluation.

The application belongs to the technical field of microfluidics, and particularly relates to a detection substrate and a preparation method thereof and a microfluidic chip. The detection substrate is used for a microfluidic chip. The microfluidic chip comprises a driving substrate arranged opposite to the detection substrate. The detection substrate is located below the driving substrate. The detection substrate comprises a substrate, a pressure transmission structure and a detection unit. The pressure transmission structure is arranged on the substrate. The detection unit is arranged between the substrate and the pressure transmission structure and is used for generating an electrical parameter change in response to external pressure. When a liquid drop is located between the driving substrate and the detection substrate, the gravity of the liquid drop is transmitted to the detection unit through the pressure transmission structure, so that the electrical parameter change of the detection unit is caused to determine the position of the liquid drop. The application can realize accurate detection of the position of the liquid drop by causing the electrical parameter change through the gravity of the liquid drop.

The application discloses a distributed interval observer optimization design method for multi-dynamic linear systems, and aims at a multi-dynamic distributed linear system disturbed by a bounded noise. Firstly, a reversible linear transformation is used to decompose an observable virtual subsystem. Then, a distributed interval observer containing output error feedback correction is designed to construct a local state interval estimation. Based on interval operation, an estimation error dynamic and its upper and lower bound explicit expressions are derived to verify the interval effectiveness. Further, Lyapunov stability theory and linear matrix inequality are used to optimize the observer gain and the collaborative coupling gain under Metzler, Hurwitz and numerical reliability constraints. Finally, the observation nodes are updated collaboratively based on the communication topology. The application does not require the system to meet strict assumptions such as cooperativeness, only needs noise upper and lower bound information, can adapt to various dynamic characteristics such as diagonal stability, strong coupling and weak damping oscillation, and has the advantages of high estimation accuracy, good numerical robustness and distributed collaboration support.

This invention belongs to the field of supercapacitor technology, specifically relating to a molybdenum oxide-molybdenum disulfide@polytannic acid electrode material, its preparation method, and its applications. Using molybdenum foil as the current collector and electrode, this invention prepares a molybdenum oxide-molybdenum disulfide electrode using electrochemical oxidation and hydrothermal methods. A polytannic acid coating is deposited on its surface to prepare a biodegradable molybdenum oxide-molybdenum disulfide@polytannic acid electrode. This electrode is then sandwiched with a biodegradable gel electrolyte and encapsulated with a biodegradable encapsulation material to construct a biodegradable supercapacitor with self-discharge suppression capabilities. By depositing a polytannic acid coating on the surface of the supercapacitor electrode, its self-discharge behavior is suppressed. The polytannic acid coating can prevent parasitic Faraday reactions of impurity ions on the electrode surface and prevent charge transfer, thereby suppressing the capacitor's self-discharge behavior. Simultaneously, the electrode, electrolyte, and encapsulation material can all degrade in simulated body fluids, potentially opening up applications in implantable medical electronic devices.

The application discloses a deepwater oilfield development yield prediction method, an electronic device, an apparatus and a storage medium, wherein the method comprises: predicting the natural yield of old wells, the yield increasing potential of old wells, the yield of new wells, planned yield loss and non-planned yield loss for each prediction year respectively; wherein predicting the non-planned yield loss comprises: determining the development stage to which a well area belongs, wherein for the well area in the aging stage, a historical curve graph of the non-planned loss rate and time relationship is determined first, the non-planned loss rate in the prediction year is calculated by fitting the relationship between the non-planned yield loss rate and the production time of the aging stage in the curve graph, the non-planned loss rate in the prediction year is corrected by using a correction factor to determine the final non-planned loss rate in the prediction year, so as to determine the non-planned yield loss in the prediction year; and the deepwater oilfield development yield is calculated according to the above prediction results.

The invention belongs to the technical field of natural pharmaceutical chemistry and medicine, and relates to a sesquiterpene compound and a separation method thereof, and application of the sesquiterpene compound in blood sugar reduction. According to the 14-acetylated 1-indanone type sesquiterpene glucoside compound disclosed by the invention, a new 14-acetylated 1-indanone type sesquiterpene glucoside compound, namely 14-acetyl-(2S, 3S)-Pterosine C-3-O-D glucoside, is separated and identified from pteris multifida poir for the first time. According to the compound, a new chemical entity is added for a natural product library, and valuable candidate molecules are provided for drug research and development. The sesquiterpene compound disclosed by the invention shows excellent alpha-glucosidase inhibitory activity; an in-vitro enzyme activity experiment shows that the sesquiterpene compound has a remarkable inhibition effect on alpha-glucosidase from yeast (the inhibition rate reaches 52.1% under the concentration of 10 mg / mL).

The application belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 4-bromopyrazole [3,4-D] -pyrimidine, and the specific steps are as follows: under the condition of anhydrous and anaerobic, 4-chloro-1H-pyrazolo [3,4-d] pyrimidine is reacted with a brominating reagent in an aprotic solvent to obtain 4-bromopyrazole [3,4-D] -pyrimidine. The preparation method provided by the application has the advantages of simple process route, clear steps, high yield of the target product, low cost, suitability for industrial production, considerable economic benefits, mild reaction condition and environmental protection.

The invention relates to the technical field of farmland improvement, in particular to a farmland improvement zoning method and system, and the method comprises the following steps: 1, zoning factor selection and weight calculation; 2, processing partition basic data; 3, partition factor calculation and statistics; 4, performing partition data standardization calculation; and 5, constructing an accurate zoning model for farmland improvement. According to the method, farmland improvement suitability zoning can be accurately carried out, and a scientific and reasonable basis is provided for farmland improvement project planning and design.

The application discloses low-bitter rice residue peptide micelles, a rice residue protein hydrolysate and a preparation method and application thereof, and relates to the technical field of protein processing. The preparation method comprises the following steps: performing step-by-step enzymolysis on rice residue protein to perform directional cutting on the hydrophilic region and the hydrophobic region of the rice residue protein, so as to obtain an amphiphilic polypeptide mixture; adjusting the pH and the temperature, so that the amphiphilic polypeptide mixture is self-assembled to form rice residue peptide micelles, and low-bitter rice residue peptide micelles are obtained. The application aims to solve the technical problems that the existing rice residue protein enzymolysis product has significant bitterness, and traditional debittering technologies have the problems of nutrient loss or the need for external addition. A new mechanism of realizing physical debittering by constructing a supramolecular micelle structure is innovatively proposed and verified. The rice residue protein peptides after enzymolysis are self-assembled to form stable nanometer micelles through step-by-step enzymolysis and directional cutting, so that the hydrophobic groups causing bitterness are selectively embedded in the core of the micelles, and the contact of the hydrophobic groups with taste receptors is physically blocked.

The invention discloses an apatinib-immune synergistic nano-drug based on bacterial source vesicles as well as a preparation method and application of the apatinib-immune synergistic nano-drug. The nano-drug is Apatinib-MVs, and the nano-drug takes a membrane vesicle secreted by parabacteroides coumarini as a carrier to entrap an anti-angiogenesis drug apatinib; in-vitro anti-tumor experiment results show that the nano-drug can exert an efficient anti-tumor effect through a dual synergistic mechanism of inhibiting tumor angiogenesis and activating anti-tumor immune response at the same time.

The invention relates to the technical field of ship lifts in water conservancy projects, in particular to an emergency braking checking method and system for a full-balance steel wire rope winch type ship lift. The invention provides a full-working-condition and multi-dimension integrated checking method aiming at the problems that an existing checking method is not adaptive to the characteristics of a full-balance steel wire rope winch type balance friction winding drum, the working condition coverage is incomplete, and the checking dimension is single. The method comprises the following steps: respectively calculating system equivalent mass and unbalanced load under normal lifting and water leakage empty working conditions; calculating system translation acceleration under each working condition based on the braking system parameters; selecting the maximum acceleration to calculate an impact load coefficient; and checking the strength and skid resistance of the steel wire rope on the basis. By means of the method, linkage checking of the load, the acceleration, the impact coefficient and the steel wire rope performance of the full-balance steel wire rope winch type ship lift in the emergency braking process is achieved, checking comprehensiveness, accuracy and engineering applicability are remarkably improved, and reliable support is provided for safety design of the ship lift.

This invention relates to a method for preparing a vanadium selenide / vanadium oxide heterojunction photo-assisted zinc-ion battery, belonging to the technical field of vanadium selenide / vanadium oxide heterojunction photo-assisted electrochemical energy storage and zinc-ion battery. The method includes the following steps: mixing a selenium source solution and a vanadium source solution to obtain a reaction precursor solution; subjecting the reaction precursor solution to a hydrothermal reaction and washing to obtain vanadium selenide material; annealing the vanadium selenide material to form a vanadium oxide layer on its surface, obtaining a vanadium selenide / vanadium oxide heterojunction composite material; mixing the vanadium selenide / vanadium oxide heterojunction composite material, a conductive agent, and a binder, adding a solvent to prepare a slurry, coating the slurry onto the surface of a current collector, and drying to obtain a photocathode. The material and its application system described in this invention exhibit good specific capacity, rate performance, and cycle stability, and demonstrate good energy storage performance under illumination conditions; this invention is beneficial for further reducing electrode polarization and promoting the synergistic enhancement of electron transport and zinc-ion storage.

The application provides a tunnel composite stratum excavation induced frictional inclined pile bearing capacity loss calculation method, comprising obtaining tunnel parameters of a shield tunnel, structure parameters of an existing pile foundation and physical and mechanical parameters of a soil body; equivalent conversion of elastic modulus of a multilayer composite soil body into homogeneous single stratum elastic modulus, analysis of a soil body plastic zone and elastic zone range and boundary radius induced by tunnel excavation, establishment of a soil body arbitrary position radial stress and hoop stress distribution model; discrete treatment of an inclined pile along a pile length, discrimination of a stress region according to distances of pile body points to a tunnel center and calculation of corresponding soil body principal stresses, solving of pile soil contact surface normal stress changes through a pile shaft and stress principal direction angle conversion; calculation of pile body point side friction resistance changes according to normal stress changes, integral obtaining of total bearing capacity losses along the pile length and calculation of frictional pile foundation bearing capacity loss factors. The calculation method has high operability, simple calculation and wide application prospects.

The application provides a new energy station short-circuit capacity calculation method and device, wherein the new energy station short-circuit capacity calculation method fully considers three main short-circuit capacity influencing factors of power grid parameters, new energy station output and fault ride-through control characteristics, accurately calculates terminal voltage and short-circuit current, and thus obtains the short-circuit capacity of the new energy station, which is used for guiding power system planning operation, equipment selection, protection setting, power quality evaluation and the like. The application has clear steps, accurate calculation and high engineering application value.

This invention provides a multi-source fusion-based system and method for calculating peak fatigue levels in runners of up to 10,000 users. The system includes a data acquisition module, a data preprocessing and fusion module, a peak fatigue calculation module, a safety early warning and coordinated intervention module, a data security and privacy protection module, and a backup data acquisition unit. The core functionality involves collecting five-dimensional, multi-source, safety-related data on runners' physiological, exercise, environmental, individual, and subjective factors through the data acquisition module. A simplified version of non-invasive electromyography (EMG) signals is introduced to identify latent muscle fatigue. A dual-layer fusion architecture of "edge + cloud" is adopted, combined with a federated learning model, to achieve deep fusion of multi-source data while protecting runner privacy, constructing a personalized dynamic fatigue threshold model. The system calculates peak fatigue levels based on a real-time safety-oriented fatigue index, implements closed-loop intervention through a four-level graded early warning mechanism linking multiple terminals, and ensures data security through three-link redundant transmission, data anonymization and encryption. The backup acquisition unit ensures full coverage of data from up to 10,000 users.

The invention discloses a preparation method of a catalyst for producing hydrogen peroxide through oxygen deficiency tandem piezoelectric-mechanical redox, and the preparation process of the catalyst comprises the following steps: firstly, constructing a zinc oxide substrate with a litchi-shaped structure through a water-phase thermally-induced self-assembly reaction; then introducing oxygen defects with controllable content on the surface of zinc oxide by adopting a liquid-phase mediated chemical reduction mode; and finally, performing in-situ auto-polymerization on the surface of the defective zinc oxide to form a polydopamine coating, thereby obtaining the target catalyst. The catalyst can efficiently and highly selectively prepare hydrogen peroxide through ultrasonic excitation under the conditions of pure water and normal temperature, has the advantages of mild reaction conditions, high generation rate, good stability, environmental protection and the like, and is suitable for the application scene of distributed hydrogen peroxide in-situ preparation.

The invention relates to the technical field of high-capacity lithium supplement of lithium ion batteries, in particular to a gradient coating and conductive bridging synergistic composite lithium supplement agent and a preparation method thereof. Aiming at the problem that the improvement thought of the existing lithium supplement agent is difficult to consider structural stability, efficient transmission and interface compatibility, the invention provides the following technical scheme: the lithium supplement agent comprises an inner core, a middle layer, a buffer layer and a chemical bridging conductive network which are sequentially arranged from inside to outside; the inner core is a metal oxide with high lithium content, and the middle layer is of a gradient structure; the buffer layer is made of flexible lithiated polymer gel; and the chemical bridging conductive network is formed by chemically bonding an aminated carbon material and the buffer layer through an amidation reaction. Through collaborative design of gradient coating, the doped transition layer and the chemical bridging conductive network, inner core volume expansion is adapted, ion and electron transmission is enhanced, interface impedance is reduced, interface optimization from the structure to transmission is achieved, and the first effect and the cycling stability of the battery are improved.

The application discloses a kind of tower deviation calculation method and system of multi-tower cable hoisting system based on single-tower linkage correction, and relates to the technical field of bridge engineering;The application is used to solve the problems of insufficient precision of traditional equivalent modulus method under the working condition of small initial cable tension and large tower top displacement, and iterative divergence caused by ignoring geometric nonlinearity of full-tower correction method.The method comprises the following steps: step S1: input system parameters, calculate the unstressed cable length of each span by iterative calculation using the elastic catenary equation, and determine the initial equilibrium state of the system;Step S2: initialize the deviation of all towers to zero, and calculate the span length of each span as the original span length;Step S3: execute the main iterative cycle based on single-tower linkage correction;Step S4: output the final deviation of each tower, the horizontal force at the end of each span cable and the horizontal elastic stiffness.The application can realize high-precision and stable convergence calculation of tower deviation under any initial tension and load working condition, and provides a reliable scheme for the final design and construction control of multi-tower cable hoisting system.

The invention provides a cementing tool for a part with a drainage groove and a forming method. The cementing tool comprises a first side insert, a middle insert, a second side insert, a first end check block, a second end check block and a fastener. The first side insert is provided with a first containing groove used for containing a product barrier strip, the second side insert is provided with a second containing groove used for containing the product barrier strip, the middle insert is provided with a boss used for being clamped in a gap of a drainage groove, the boss is provided with a plurality of sawtooth strips at intervals in the length direction, and the sawtooth strips are placed in the drainage groove. The first end check block abuts against the first end of the first composite part, the second end check block is used for abutting against the second end of the first composite part, and the fastener is connected with the first side insert, the middle insert and the second side insert in a fastened mode. According to the invention, the shape of the composite material part and the size of the drainage channel can be restrained, so that the cementing forming quality of the part in a high-temperature environment of a vacuum tank can be ensured.

The invention relates to the technical field of plasma arc welding, and discloses an alloy steel mechanical part positioning welding device which comprises a welding table and a driving disc arranged on the top face of the welding table, a welding base is fixedly installed at the position, located on the side edge of the driving disc, of the top face of the welding table, and a plasma arc welding gun is arranged at the movable end of the welding base. A plurality of evenly-distributed mounting holes are formed in the top face of the driving disc, and a plurality of supports are arranged on the top face of the driving disc. According to the clamping device, the position of the support is adjusted, a limiting plate and a positioning plate are matched to ensure that the support is coaxially installed in an installation hole, then the support is attached to the outer wall of a workpiece through a spring telescopic rod and a pressing strip, the spring telescopic rod is fixed through a locking frame, and multi-point adaptive clamping can be formed according to the irregular shape of the special-shaped workpiece; meanwhile, due to the angle locking design of the locking cone pulley and the locking cap, deviation of the workpiece in the welding process is avoided, the problem that special-shaped alloy steel accessories are difficult to fix is solved, it is guaranteed that the workpiece is accurately positioned and firmly fixed before welding, and a foundation is laid for high-quality welding.

The invention relates to ZIF-8 modified sodium alginate-starch composite hydrogel as well as preparation and application thereof, belongs to the technical field of composite material preparation, and aims to solve the problems that nano-particles in the sodium alginate-starch composite hydrogel are easy to agglomerate and non-uniformly dispersed, so that the interface bonding is weak, and the stability is poor. The mechanical strength, the structural stability and the functional characteristics are difficult to meet the requirements. The technical scheme is as follows: adding ZIF-8 powder into distilled water, carrying out ultrasonic treatment for 8-12 minutes, adding sodium alginate, stirring and dissolving at 55-65 DEG C, cooling, adding starch, stirring to obtain precursor slurry, and heating and gelatinizing at 85-95 DEG C; the ZIF-8 powder subjected to interface modification by the silane coupling agent KH550 is introduced, so that the dispersity of nanoparticles in a hydrophilic sodium alginate-starch matrix is effectively improved, and the interface bonding between a filler and a polymer network is enhanced, so that the mechanical property and the structural stability of the composite hydrogel are favorably improved, and the application range is wide.

This invention discloses a detergent for removing milky odor and its preparation method, comprising the following components by weight percentage: 6-10 parts nutmeg extract, 2-3 parts phospholipase, 2-3 parts lipase, 3-5 parts α-amylase, 3-6 parts natural citric acid, 1-2 parts cyclodextrin, 0.5-1.5 parts dipotassium glycyrrhizate, 2-3 parts C8-16 alkyl glucoside, 2-3 parts C10-16 sodium polyoxyethylene ether sulfate, 1-2 parts aminopropylamine cocoate, and 1-2 parts sodium C10-16 alkylbenzene sulfonate. Through the synergistic effect of specific enzyme preparations (phospholipase, lipase, and α-amylase), it efficiently decomposes residual lipids and proteins in milk stains, thus fundamentally eliminating the milky odor. Simultaneously, the cyclodextrin encapsulation technology, natural citric acid, and green tea polyphenol extract further adsorb and neutralize odor molecules, achieving multiple effects of deodorization, anti-oxidation, and antibacterial properties.

This invention provides a high-temperature resistant superhydrophobic micro / nanostructure coating and its preparation method. The coating is constructed on a substrate surface and includes an adhesive underlayer and a functional surface layer located on the surface of the adhesive underlayer. The adhesive underlayer contains phenyl silicone resin, and the functional surface layer contains superhydrophobic particles, phenyl silicone resin, and carbon fiber shear tubes. The carbon fiber shear tubes form a micron-scale framework structure, and the superhydrophobic particles form a nano-scale rough structure; together, they constitute a hierarchical micro / nanostructure. This invention forms an inorganic-organic hybrid high-temperature resistant superhydrophobic micro / nanostructure coating by synergistically constructing superhydrophobic particles, phenyl silicone resin, and carbon fiber shear tubes on the substrate surface. The superhydrophobic particles provide a high-temperature resistant hydrophobic base, the phenyl silicone resin provides a high-temperature resistant bonding effect, and the carbon fiber shear tubes provide structural reinforcement. Therefore, the resulting coating possesses both good thermal stability and structural stability, and can mitigate performance degradation under high temperatures.

This invention relates to the field of land consolidation and development technology, and in particular to a land leveling device and method with adjustable functions. The leveling method involves first determining a reference horizontal plane, then dividing the farmland into m*n blocks. The bucket passes through n rows of farmland sequentially along a first direction, recording the distances h1 to hn between the reference horizontal plane and the blade. Based on the data h1 to hn, the average distance h between the blade and the reference horizontal plane when in n rows of farmland is obtained. Δh is measured based on the soil volume in the bucket and the farmland area. (h-Δh) is the distance between the target leveling surface and the reference horizontal plane. The bucket height is adjusted to maintain the distance (h-Δh) between the blade and the reference horizontal plane. The process continues along a second direction, passing through m rows of farmland sequentially, completing the farmland leveling. The leveling method provided by this invention facilitates the determination of the target leveling surface and is more conducive to agricultural cultivation and irrigation drainage.

The invention provides a machining method and device for a cross-flow fan with multiple sections of impellers connected in series. The machining method comprises the steps that at least four end plate blanks guaranteeing the parallelism of the upper face and the lower face are stacked and fixed to a tool plate; synchronously machining a rotating shaft center hole, a positioning pin hole and a directional reference surface corresponding to the axis of the impeller on the fixed end plate blank; the end plates are detached; a cross beam corresponding to each impeller unit is machined, and positioning pin holes in the two sides of the cross beam are machined on the basis that the parallelism of the butt joint plane is guaranteed; two end plates corresponding to a single impeller unit are positioned and placed on the datum planes of the two end plates, a coaxial tool penetrates through rotating shaft center holes of the two end plates, a cross beam is arranged between the two end plates and pre-fastened through screws, and positioning pin holes in the end plates and the cross beam are corrected and finely machined through a reamer; at least two impeller units are connected in series along the axis, and positioning and fixing are conducted at the butt joint positions of the adjacent impeller units. The cross-flow fan manufactured based on the method is small in vibration, low in noise and stable in operation, the product performance is substantially improved, and the service life is substantially prolonged.

This invention discloses a self-sensing flange gasket for structural health monitoring of pipeline systems. The flange gasket consists of functional components and signal transmission circuit components. The functional components have a three-layer concentric ring contact structure, including a sealing inner ring layer, a leakage detection middle ring layer, and a sealing reinforcement outer ring layer, used to achieve the sealing and condition monitoring functions of the flange gasket. The signal transmission circuit components include an inner ring edge electrode layer and a middle ring planar interdigitated electrode layer, used to acquire and transmit electrical signals from the flange gasket. All components use flexible PDMS as the base material to ensure the elastic deformation sealing capability of the flange gasket, while the self-adhesive properties of PDMS are used to achieve seamless assembly between the layers. This invention, through a multi-functional layer modular design, utilizes multi-dimensional electrical signal changes caused by different physical parameters to achieve simultaneous detection of fastening pressure and leakage components, thus meeting the engineering requirements for condition monitoring of pipeline systems.

The invention discloses an LCL integrated filter based on transformer leakage inductance multiplexing. The LCL integrated filter comprises a discrete inductor, a transformer side inductor and a filtering branch, the transformer side inductor is the inherent leakage inductor of the transformer, and the filter branch comprises a filter capacitor C. According to the LCL filter, the inherent leakage inductor of the transformer is multiplexed to serve as topological optimization of the power grid side inductor and the filtering branch, and the technical problems that a traditional LCL filter needs to be independently provided with the power grid side inductor, so that the size is large, cost is high, the inherent leakage inductor of the transformer is idle and wasted, instability is likely to happen under a weak power grid, and harmonic suppression cannot meet the grid connection standard easily are solved.

This invention relates to the field of precision machining technology for semiconductor materials, and in particular to a chemical mechanical polishing (CMP) slurry, its preparation method, and its application. The CMP slurry comprises the following components by mass percentage: 6-12% composite abrasive, 3-7% composite oxidant, 2-5% complexing agent, 0.5-2% phosphine detoxifier, 0.3-1.5% dispersant stabilizer, 0.1-1% pH adjuster, and water as the balance. The composite abrasive is a composite material of alumina and silicon dioxide. The composite oxidant includes sodium hypochlorite solution and hydrogen peroxide solution. This invention, through the rational proportioning and synergistic effect of the composite abrasive, composite oxidant, complexing agent, phosphine detoxifier, dispersant stabilizer, and pH adjuster, is not only suitable for single substrates but also compatible with the CMP polishing of three typical third-generation semiconductor materials: indium phosphide, gallium arsenide, and germanium. It exhibits good versatility and process adaptability, helping to reduce production costs and process changeover complexity.