151results about How to "Universal" patented technology

The invention provides a simple universal nanometer functionalization surface modification method based on o-dihydroxybenzene derivatives. The method comprises that: dopamine is used to perform surface decoration on a basis material for one or more times, then the basis material subjected to surface decoration is subjected to nanometer functionalization decoration for one or more times; and nanometer functional materials such as various organic or inorganic nanometer particles, nanometer wires, nanometer sols, nanometer tubes and the like are fixedly disposed on the surface of the basis material, so that the material surface is improved in hydrophilicity, hydrophobicity, roughness and anti-pollution capability, or the material is enhanced in biocompatibility and performances such as antibiosis, catalysis and the like, or the material is endowed with new conductive, optical, thermodynamical performances and the like and enhanced in mechanical strength.

The invention discloses a method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur, which belongs to the technical field of hydrogen production and gas purification. The invention is characterized in that: hydrogen sulfide or gas containing hydrogen sulfide is subjected to ionization through blockage of discharge by using a medium so as to form uniformly distributednon-equilibrium plasma, and hydrogen sulfide spontaneously decomposes into hydrogen and elemental sulfur in the plasma; when there is a photocatalyst in the plasma, energy in the photons of the photocatalyst can be utilized to promote decomposition of hydrogen sulfide, and complete conversion can be realized under proper conditions. All the frequently used solid photocatalysts can be used in the above mentioned process, e.g., titanium oxide, cerium oxide, zirconia, zinc oxide, cadmium oxide, copper oxide, molybdena, tungsten oxide, zinc sulfide, cadmium sulfide, copper sulfide, molybdenum sulfide, tungsten sulfide and a mixture composed of two or more selected from the above-mentioned photocatalysts; the photocatalysts can also be loaded on a porous material to prepare load type catalysts. The method provided in the invention is especially applicable to treatment of gas containing hydrogen sulfide in the industries of natural gas, petroleum and coal chemistry and is also applicable topreparation of hydrogen and elemental sulfur through dissociation of gas containing hydrogen sulfide in the fields of metallurgy, sea and the like. The method has no special requirements for or restriction on the source and composition of gas; thus, the method has universality to preparation of hydrogen through decomposition of hydrogen sulfide.

The invention provides a single-linear-array laser radar equipment centering method. The method aims to solve the high-precision centering problem of laser radar equipment, a laser radar triangular reflection target is adopted and scanned and imaged for many times, and the centering problem of the laser radar equipment is changed into a problem of intersection of straight lines, so that the relevance between centering of the laser radar equipment and equipment work principles is lowered, the centering procedures of the laser radar equipment are simplified, and precision of centering and ranging evaluation of the laser radar equipment is improved.

The invention discloses a user typical load curve construction method based on density clustering. The user typical load curve construction method comprises the steps of (1) inputting the daily load time sequence of an object in a certain time interval, (2) conducting density clustering on the daily load time sequence by setting the searching radius epsilon and the minimum object number M according to the density variation of distribution of the normalized daily load time sequence in vector space, (3) dividing the object of the daily load time sequence into one or more time sequence clusters and one or more noise time sequence classes according to the results of the density clustering, and (4) extracting one or more typical load time sequences of a user. According to the characteristics of complex load changes of the user, the user typical load curve construction method uses the density variation of distribution of the normalized daily load time sequence in the vector space, the typical load time sequence of the user is extracted by setting reasonable density search parameters, the cluster number is not required to be appointed, noise loads can be removed, and the user typical load curve construction method is much suitable for extracting the one or more typical load time sequences in the user stage.

The invention discloses a device for measuring the frequency response characteristic parameter of a light wave component. The device comprises a signal separation unit, a signal processing unit, a multichannel amplitude phase frequency mixing reception unit, an RF test unit and a high-frequency optical carrier wave signal generation unit; and a signal source generates a high-frequency modulated electric microwave signal, the signal separation unit separates the high-frequency modulated electric microwave signal into a reference signal and an input signal, and the reference signals and the input signal are received by the multichannel amplitude phase frequency mixing reception unit. Electric-optical, optical-electrical, optical-optical and electric-electric test functions are integrated in the device, the device is convenient to carry and highly integrated, and the frequency response characteristics of different light wave devices can be tested rapidly and accurately.

The invention provides a general preparation method for a reduced graphene oxide-based composite film. The method comprises the following steps: firstly preparing a graphene oxide-based mixed solution, preparing a graphene oxide-based composite film by using a manner such as vacuum suction filtration, spin coating, drop coating, blade coating and coating, putting the graphene oxide-based compositefilm into a reaction vessel, adding a liquid, performing sealing, and conducting a hydrothermal or solvothermal reduction reaction at a certain temperature to prepare the reduced graphene oxide-basedcomposite film, wherein the mixed solution can contain a polymer, an organic nano material, an inorganic nano material, a metal nano material and the like besides graphene oxide. The method providedby the invention has the advantages of high universality and a simple and convenient preparation process; the prepared reduced graphene oxide-based composite film can be further subjected to high-temperature reduction to obtain a reduced graphene oxide-based composite film with a higher graphene reduction degree and a more complete crystal structure; and the reduced graphene oxide-based compositefilm prepared by utilizing the method has good stability, adjustable thickness and crispness, and thermal conductivity, electrical conductance and catalytic performance of the composite film can be adjusted through different compounding.

A configurable distributed three-dimensional scene simulating system comprises a scene configuring module, a configuration analyzing module, a data interface module, a message processing module, an entity managing module, a scene drive module and a user control module. The simulation process is rendered by configuring a graphical interface, special effect configuration is performed on various rendering events of simulation entities, rendering configuration file templates are provided aiming at basic simulation entity types, and visualized rendering configuration tools are provided. Corresponding styles and effects can be dynamically loaded according to message type and rendering configuration information of rendering events during simulation rendering. The heritage mechanism of HLA object models is utilized to achieve automatic data association of scene simulation three-dimensional entity models and the entity models corresponding to the distributed simulation system, and the complex data purchasing process of a common scene simulation system, as a federation, joining a simulation platform.

The invention relates to a grouting process for a working surface of a deep well, which comprises a pore forming process and a grouting process and is characterized by comprising the following steps of: firstly, after the height of a tunneling section of a grout stop pad meets the requirement, carrying out drilling and water exploration on a lower rock stratum by using an umbrella drill; secondly, arranging a large lining formwork in the tunneling section of the grout stop pad and then constructing a drilling platform by utilizing the large lining formwork; thirdly, embedding an orifice pipe, a water filtering bucket and a water filtering layer and pouring concrete; and finally, perforating pressure relieving holes on the grout stop pad and carrying out drilling and grouting operation. The grouting process for the working surface of the deep well is reasonable, can have universality, can improve the working efficiency of the pre-grouting operation of the working surface of the deep well, guarantees that the waterproofing construction of a mineshaft is carried out successfully, and has a short grouting period and low construction cost.

The utility model discloses an extraction method for characteristics of origin-destination traffic flow, which is characterized in that for the first step vehicle trip information is acquired in an area between the origin and the destination, and a relational database is formed based on the information; for the second step, according to the information from the first step, a sampling full-day O-D matrix Pkiv is formed based on a group of samples like investigation point, direction and vehicle model: with an investigation point or area as a unit, the group of sampling full-day O-D matrix Pkiv is collected and the sampling expansion of the group of sampling full-day O-D matrix Pkiv is corrected as the O-D data of gross sample with annual representativeness; for the third step, with SQL query method, the traffic flow characteristics can be acquired. The utility model has the advantages that the method organically integrates every step of data processing concerning with the O-D investigation and the section flow investigation based on the universal database, so that users can automatically recognize the investigation content and the coding form in a certain standard framework and various kind of O-D matrix and common traffic flow characteristics can be extracted automatically by the powerful SQL sentences.

The invention provides a method and device for detecting hydrogen leakage of a vehicle-mounted hydrogen supply system and a fuel cell vehicle. The method comprises the steps: determining the current working condition of the fuel cell vehicle; determining a detection time period according to the current working condition; obtaining the hydrogen leakage quality of the vehicle-mounted hydrogen supplysystem in the detection time period; calculating the hydrogen leakage rate according to the hydrogen leakage quality and the detection time period; and when it is judged that the hydrogen leakage rate is larger than a preset value, determining that the hydrogen leakage occurs in the vehicle-mounted hydrogen supply system. According to the technical scheme provided by the invention, hydrogen leakage of the vehicle-mounted hydrogen supply system of the fuel cell vehicle can be quantitatively detected by calculating the hydrogen leakage rate, the accuracy and timeliness of hydrogen leakage detection are improved, and the problems of potential safety hazards and waste caused by hydrogen leakage are solved.

The invention discloses a method and device for measuring volume of liquid in container based on an acceleration sensor. According to the scheme of the method and device, the acceleration sensor is utilized for obtaining different attitude parameters, and through the attitude parameter obtained when the container stably reaches the water outlet critical position, the volume of the liquid which is contained in the container at present is calculated by utilizing the mapping relation between the pre-determined attitude parameter and the liquid volume or the water volume. The method and device have the advantages of being extremely great in universality, low in power consumption, low in cost, low in structural requirement and the like.

The invention discloses a preparation method of processed cheese and the processed cheese prepared through the method. According to the preparation method of the processed cheese, raw materials comprise natural cheese, fruit grains, emulsifying salt, butter oil, sweetening agents, acidity regulators, lactoprotein raw materials, stabilizers and water, and the mature period of the natural cheese is shorter than one year; the method includes the following steps that the raw materials are mixed, cooled, packed in a filling mode, and further cooled. The preparation method of the processed cheese is simple in operation, suitable for various fruit grains, high in universality and beneficial to industrial production. The fruit grains of the processed cheese are distributed uniformly and can be seen by naked eyes, the processed cheese is distinct in chewiness, long in shelf life, stable and safe in the shelf life, good in mouthfeel, high in elasticity, excellent in tenderness and smoothness, good in chewiness, good in flavor and texture, moderate in sweetness and acidity and capable of containing different types of fruit grains, cut surfaces are smooth and flat, the number of types of processed cheese is increased, and the processed cheese is delicious and nutrient.

The invention discloses a visual nozzle that can be applied to simulating a real nozzle of a direct injection engine. The visual nozzle comprises a nozzle body, an adapting head and transparent glasses at an extended segment, wherein the nozzle body forms an internal flow path of the nozzle by means of clamping two pieces of transparent glasses and a precise gasket by using two clamp bodies, the gasket is capable of guaranteeing air tightness; the top of the nozzle body is connected with the adapting head, while the bottom of the nozzle body is connected with the transparent glasses at the extended segment, so as to form an external flow path of the nozzle. According to the visual nozzle disclosed by the invention, by means of simultaneously observing internal flow characteristics (such as cavitation, and generation, growth as well as rupture progresses of bubbles), and external spray characteristics (such as rupture, atomization and evaporation) of the nozzle, the internal and external characteristics of the nozzle are correlated, so that fracture and atomization progresses of liquid jet flows can be mastered comprehensively; the two-dimensional visual nozzle is relatively symmetrical in structure and convenient to process, is capable of realizing continuous test at high-temperature and high-pressure conditions; meanwhile, the internal and external flow paths of the nozzle are changeable in the shape, the structure as well as the size, and internal and external fluid characteristics of a nozzle hole under different conditions can be acquired, therefore, the visual nozzle is universal.

The invention relates to a quick purifying agent for nonselective heavy metal wastewater, and belongs to the technical field of environment protection. The quick purifying agent is prepared from, by weight, 30-60% of na-bentonite, 10-50% of acid-treated steel-slag-ground powder, 12-32% of aci-treated powder plant ash, 1-3% of polyethylene glycol polymers and 0.5-1.5% of polyacrylamide, and the sum of the components is 100%. The quick purifying agent has the advantages that the components of the quick purifying agent for the nonselective heavy metal wastewater are deep researched, the five components are selected, the universality problem of heavy metal wastewater treatment is solved, and the quick purifying agent for the nonselective heavy metal wastewater is good in treatment effect, low in production cost, high in universality, short in treatment cycle and low in equipment condition requirement and cannot cause secondary water pollution.

The invention provides a dust accumulation judging device and method and an air conditioner. The dust accumulation judging device includes an acquisition module and a judging module, and the acquisition module is used for acquiring an operation state of the air conditioner, a detect temperature T<detect> of the surface of a heat exchanger, a temperature T<heat exchanger> of a heat exchanger coiledtube and an indoor temperature T<indoor>; and the judging module is used for judging whether a filter screen is in a blocked state or not according to the operation state of the air conditioner, theT<detect>, the T<heat exchanger> and the T<indoor>. According to the dust accumulation judging device and method and the air conditioner, whether the filter screen is dirty and is blocked or not can be effectively judged according to the operation state of the air conditioner, the T<detect>, the T<heat exchanger> and the T<indoor>, so that users are warned to clean the filter screen in time, the effects of cooling and heating are improved, and the purpose of energy consumption lowering is achieved.

The invention discloses a cascading system theory-based track tracing control method of a wheeled mobile robot. The cascading system theory-based track tracing control method comprises the steps of firstly, building a three-degree of freedom kinematic model of the wheeled mobile robot under a Cartesian coordinate system, and giving an expected track kinematic expression form by the robot kinematicmodel; secondly, introducing a pose error, and building a track tracing error system kinematic model by global coordinate conversion; and finally, designing a track tracing control method according to a cascading system theory, and selecting an appropriate control parameter so that a closed-loop track error system globally approaches to stability, a tracking error approaches to 0 and real-time and accurate tracking of expected motion track by the robot is achieved. The cascading system theory-based track tracing control method is simple in form and high in practicability, the tracing of the wheeled mobile robot on the expected motion track can be effectively achieved, and the cascading system theory-based track tracing control method has very wide application prospect.

The invention relates to a nanometer tin soldering method which belongs to the technical field of nanometer and adopts an atomic force microprobe as a welding torch, specifically speaking: the atomic force microprobe, soldering tin material and welding mode are selected; an atomic force microscope is adopted to find a nanometer component to be welded, namely, to precisely position a welding point; soldering tin is dipped on a probe and then atomic force imaging scanning is carried out to find the original position which is the nanometer device selected in the second step, the height image is recorded and the scanning scope is shortened to lock the welding position on the nanometer component, then a bias voltage is applied on the probe of the atomic force microscope so that the probe can touch the surface of the nanometer component, then the scanning operation is kept and weld is carried out, then the bias voltage is removed and the normal atomic force microscope imaging state is returned after the welding operation is finished, the welding effect is inspected and the welding result is recorded; the nanometer welding operation on more than one places on the nanometer component is repeated and the welding result is recorded. The invention is a nanometer 'tin soldering technology' that is applied to the nanometer component and is precise in positioning, controllable in welding size, high in automation degree and strong in universality.

The embodiment of the invention discloses a document printing method and device. The document printing method comprises the steps that a document printing request sent by a mobile device is received; the document printing request is responded, and a preset printer list is sent to the mobile device; after a printer selection request input by the mobile device according to the printer list is received, a printer selected by the mobile device is determined according to the printer selection request; receiving of a target document uploaded by the mobile device and printing parameters corresponding to the document is started; a printing control device is controlled to call the printer selected by the mobile device to print the target document according to the printing parameters. According to the technical scheme, by means of the document printing method, the mobile device utilizes a login account number to establish connection with a server device and the printing control device, the situation of calling the printer connected with the printing control device to print the document can be achieved, and operation is easy; in addition, special requirements on the printer do not exist, and the universality is strong.

The invention discloses a method and a system for air compressor rotating stall predication based on first-order modal amplitude slope. Sensors arranged on a wall surface of an air compressor are used for acquiring pressure signals, the pressure signals are converted into digital signals, a central processor obtains flow distribution according to pressure distribution and analyzes to obtain a first-order modal to further obtain a predictive index, the predictive index is compared with a threshold to judge whether rotating stall occurs or not, and accordingly rotating stall is predicated in advance. The method and the system are simple in device, easy to implement, small in computational amount, high in speed and applicable to various working conditions, reduce complexity of independent processing of each working condition and have theoretical bases, a warning signal is sent out before rotating stall so as to achieve advance control, the problem of difficulty in rotating stall control is solved, and accordingly loss is avoided.

The invention discloses a wrist reference segmentation method, which comprises the following steps of 1, extracting and preprocessing a reference bone region of interest image; 2, segmenting the reference bone region of interest image; and 3, post-processing the reference bone region of interest. According to the scoring method, the bone age is calculated by evaluating the mature indications of the reference bone combination, and the bone age calculated through the method is small in deviation. Due to the influence of the factors, such as the irregular shapes of the reference bones, the low contrast ratio of the reference bones and the soft tissues, the adjacent positions of the reference bones, etc., difficulty is increased for the experts to accurately evaluate the maturation indicationsof the reference bones. The reference bone segmentation accuracy is guaranteed, and meanwhile it is guaranteed that the reference bone segmentation method has higher universality. The method comprises the following steps of firstly, extracting a reference bone ROI image by adopting a Faster R-CNN; then, inputting the preprocessed reference bone ROI image into the ARU-Net to be segmented, adding the residual error mapping and an attention mechanism to the ARU-Net on the basis of traditional U-Net to improve the accuracy of reference bone segmentation and the utilization rate of features; and finally, eliminating the phenomena of edge sawteeth, holes and the like in a prediction result by adopting a flooding filling algorithm and the corrosion and expansion operation.

The invention discloses a device and a method realizing synergic effects of waste heat utilization, desulfurization wastewater zero-emission and smoke plume removal, the device comprises a boiler, anair preheater, a dust remover, a desulfurization tower and a chimney which are sequentially connected through a pipeline, a wastewater sedimentation tank, a wastewater concentration tower and a wastewater flashing tower simultaneously are connected to corresponding equipment in the device, a high-temperature gas required in the working process of the wastewater flashing tower and the wastewater concentration tower is taken from high-temperature flue gas during the operation of the device; and generated gases are sent into the dust remover for dust removal circulation. An acoustic wave agglomeration device and a demister are disposed in a connecting pipe between the desulfurization tower and the chimney. The method comprises the steps of concentrating and flashing the high temperature fluegas in the process of operation of the desulfurization wastewater utilization device, and finally feeding the concentrated and flashed gas to the device for circulation, thereby achieving zero emission, discharged smoke plume can be reduced by use of synergic effects of the reduced flue gas temperature, the acoustic wave agglomeration device and the demister, and the goal of energy saving and environmental protection, wastewater zero-emission and exhaust emission reduction can be comprehensively realized.

The invention provides a method for determining the channel forming discharge in the river sink of the tributary stream, and takes hydrological and weather factors of the main stream and the tributary stream into consideration. The method is characterized by comprising the following steps: step 1, distinguishing the steady state of the incoming water and sediment of the tributary stream channel and determining the sediment transport rate index; step 2, performing interval partition on the flow rate data of the hydrometric station at the inlet of the river sink and the water level data of the hydrometric station at the outlet of the river sink; step 3, determining the gradient relation curve of the river sink of the tributary stream; and step 4, drawing a channel forming strength line in the inlet flow rate-outlet water level coordinate plane, and calculating the channel forming discharge by adopting a graphical method.

The invention provides a white balance adjusting method, which is applicable to adjusting white balance of a photo. The white balance adjusting method comprises the following steps: acquiring a white photo as a calibrating photo; graying the white photo to obtain a standard calibrating photo; for a calibrating pixel in the standard calibrating photo, acquiring an RGB value and a gray value of the calibrating pixel; performing processing to obtain a corresponding RGB calibrating value according to the RGB value of the calibrating pixel; acquiring a photo with chromatic aberration to serve as a to-be-calibrated photo; S6, for a to-be-calibrated pixel in the to-be-calibrated photo, acquiring a to-be-calibrated RGB value of the to-be-calibrated pixel; performing processing to obtain an RGB standard value in which the chromatic aberration is removed according to the RGB to-be-calibrated value of the to-be-calibrated pixel and the RGB calibrating value; judging whether pixels that have not been calibrated exist in the to-be-calibrated photo or not; if pixels that have not been calibrated exist, returning to the steps above; and if pixels that have not been calibrated do not exist, the adjustment being finished. By means of the white balance adjusting method, the universality is higher, the visual effect of the photo is obviously improved, and the vigorousness and robustness are higher.

The invention discloses a depth belief network-based link prediction method. The method comprises the steps that firstly a training data collection module performs random sampling in a given network structure to obtain a training edge set, a verification edge set and a test edge set; a network node characteristic representation module generates a characteristic representation of each network node by using a deepwalk algorithm in a network processed through the training data collection module; an edge characteristic representation generation module calculates a characteristic representation of each edge in the training edge set, the verification edge set and the test edge set, and performs normalization processing on eigenvectors of generated edges to meet the requirements of a depth belief network on input data; and finally a depth belief network training module constructs a depth belief network structure and loads the training edge set, the verification edge set and the test edge set to perform training. According to the method, the prediction accuracy higher than that of a conventional link prediction algorithm can be achieved; and the method has universality for networks with various structure characteristics.

The invention discloses a computing method for aero-engine barycenter. The method has the advantages of high computing precision, high universality, convenience, quickness, and the like. According to the technical scheme provided by the invention, the computing method for aero-engine barycenter mainly comprises the following steps: a) establishing a transformation matrix of a local coordinate system of a component relative to a relative coordinate system; b) establishing the transformation matrix of the local coordinate system of the component relative to a main coordinate system; c) acquiring engine barycenter. The method provided by the invention has the advantages: 1) the barycenter parameter of the whole engine can be accurately calculated and the operations, including designing the hoisting and transporting assembly, assembling the whole engine, and the like, can become convenient; 2) the method has ultrahigh universality and can be used for computing the barycenter parameter of any part; 3) the method provided by the invention has same reference significance for other rotary machinery.

The invention discloses a tactile interaction device and method for a 360-degree suspension light field three-dimensional display system, and belongs to the technical field of computer vision. The device comprises a Leap Motion arranged on one side of a high-speed rotating screen and used for collecting hand position information, a fingerstall with a vibration function and a processor used for processing information and transmitting signals. The processor is in communication connection with the Leap Motion to obtain hand position information, the processor is provided with a Bluetooth transmitting module, instructions are sent to the fingerstalls through the Bluetooth transmitting module to control vibration of the fingerstalls, and Bluetooth receiving modules are arranged in the fingerstalls. Finger information reading, coordinate conversion, model judgment, Bluetooth transmission, hardware driving and other steps are carried out to realize interaction of fingers and model force touch. When the fingers are in contact with the boundary of the display model within a certain range, the finger sleeves can exert vibration force on the fingers, and the effect of force tactile interaction is achieved. Namely, when the hand touches the display model, the fingers have vibration touch feeling. Therefore, more real sensory experience is provided for the user.

The invention discloses a method for forming a multi-focus bionic compound eye structure, and relates to the field of micro machining, bionic compound eyes and the like. The method comprises the following main steps: (1) selecting a base material and spinning photoresist; (2) moving a mask for exposing to realize photoresist formation of a planar continuous surface profile multi-focus compound eye structure; (3) etching the planar multi-focus compound eye photoresist structure, and transferring to the base material; (4) preparing a flexible multi-focus compound eye structure template complementary to the multi-focus compound eye structure based on the multi-focus compound eye structure on the base material; and (5) introducing a photocuring material, and transforming the planar multi-focus bionic compound eye structure information into a curve structure by utilizing a structural device with mutually matched curvature to form an integrated multi-focus bionic compound eye structure.

The invention provides a pedestrian volume statistical approach based on WiFi channel state information and dynamic time wrapping for passageways and entrances and exits. Special hardware facilities are not constructed, and an existing WiFi wireless network is fully used. The method can carry out precious statistics on the pedestrian volume through the passageways or entrances and exits, is low incost and high in universality, and can work effectively under the conditions of light and no light. After a CSI data sequence is acquired, noise in the CSI data is removed first by means of a movingaverage algorithm and the CSI data after smooth denoising is normalized to -1 to 1. As it takes the crowds a certain time to pass through the passageways or entrances and exits and the time and rate passing through the passageways or entrances and exits of crowds at the same volume each time may be different, CSI data sequence templates are trained and matched by adopting a DTW algorithm to determine the accurate correspondence relationship among different CSI data sequences, so that template matching and similarity calculation are more accurate, and statistics of the pedestrian volume is moreaccurate.

The invention discloses a lithium transitional metal oxide and a preparation method and an application thereof. The lithium transitional metal oxide is a Li<1+x>Ni<y>M<z>Mn<2-y-z>O<4-delta> material with a spinel structure, or aLi<2>M'O<3>.(1-a)LiM''<s>R<1-s>O<2> material with a layered structure, wherein x is greater than or equal to -0.1 and less than or equal to 0.2; y is greater than or equal to 0 and less than or equal to 0.6; z is greater than or equal to 0 and less than or equal to 1.25; y+z is greater than or equal to 0 and less than or equal to 1.25; <delta> is greater than or equal to 0 and less than or equal to 0.05; a is greater than or equal to 0 and less than 1; and s is greater than or equal to 0.8 and less than or equal to 1. According to the preparation method, a metal-organic coordination polymer precursor method is adopted; organic complex is terephthalic acid and derivatives thereof; and the metal-organic coordination polymer is subjected to heat treatment and high-temperature calcining to obtain the lithium transitional metal oxide. The synthetic method is simple in process and the cost is low, so that large-scale production of the positive electrode material of the lithium transitional metal oxide can be carried out favorably; and in addition, the prepared lithium transitional metal oxide has high crystal form, adjustable grain diameter from nanometer to micron, special appearance and specific crystal surface orientation, and excellent electrochemical performance when the lithium transitional metal oxide is used as the positive electrode material of the lithium ion battery.

The invention discloses a graphene transfer method and belongs to the technical field of material science. The graphene transfer method comprises 1, pretreating a high-melting point metal as a metal base, 2, putting a low-melting point metal or alloy on the metal base and carrying out heating to obtain a metal base with the low-melting point metal or alloy, 3, carrying out graphene growth to obtain a metal base with the graphene, and 4, putting the metal base with the graphene on a heating table, carrying out heating at a temperature higher than a melting point of a low-melting point metal or alloy, putting the target substrate on graphene to be transferred and slipping the graphene to the target substrate. The method is suitable for any substrate such as a silicon chip, quartz, hafnium oxide, beryllia and a plastic film. The method has a fast transfer speed, realizes thorough graphene transferring, has simple conditions, realizes recycle of a metal substrate and is especially suitable for industrial production.