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31results about How to "Improve performance loss" patented technology

Surface modification method of carbon fiber by plasma treatment and coating of nano graphene

The invention relates to a surface modification method of carbon fiber by plasma treatment and coating of nano graphene, which is characterized in that nano graphene and a carbon fiber material are used as raw materials, and a nano graphene coating is coated on the surface of the carbon fiber material by a plasma treatment and coating method. The method comprises the steps of: (1) preparing 0.5-10% organic solvent or water sol solution of nano graphene by utilizing an ultrasonic oscillating technology; (2) coating the graphene solution on the surface of carbon fiber and drying; and (3) placing the carbon fiber on a plasma device, and spraying the plasma to the surface of the carbon fiber for surface modification, wherein the treatment power is 100-1000W and the time is 10-900s. By adopting the method, a high-performance composite material can be formed, and the mechanical property, conductivity and heat resistance of the carbon fiber are further improved. The method is low in cost, simple in operation, strong in applicability, good in treatment effect and not likely to cause environmental pollution, and is suitable for industrial production.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Method for improving quality of broadcasting service in mobile communication network

The invention provides a method for improving the quality of a broadcasting service in a mobile communication network, which is invented to solve the problem that the quality of the broadcasting service in the prior cellular mobile communication network cannot be guaranteed. The method comprises the following steps: testing the received power strength of a broadcasting service channel in a service coverage region, and determining the location of a region in which the received power strength of the broadcasting service channel does not reach an expected value; if the region not reaching the expected value is positioned on the edge of the service region, superposing a beamformed broadcasting service channel with a different frequency or a different time slot which bears the same service on the basis of the prior signals in the service coverage region; and if the region not reaching the expected value is not positioned on the edge of the service region, performing joint adjustment of thepower of the broadcasting service channels of a plurality of cells in the service coverage region. The method can select different adjusting modes according to the location characteristics of the region not reaching the standard and improves broadcasting service signals by power compensation or multi-element antenna beamforming.
Owner:THE RES INST OF TELECOMM TRANSMISSION MIIT +1

In-phase/quadrature (IQ) imbalance compensation method for differential encoding orthogonal frequency division multiplexing (OFDM) system

The invention belongs to the technical field of wireless communication, and relates to an in-phase / quadrature (IQ) imbalance compensation method for a differential encoding orthogonal frequency division multiplexing (OFDM) system. The method mainly utilizes compensating parameters of a subcarrier and a mirror image subcarrier to perform combined estimation, thus compensating the IQ imbalance in the system. The IQ imbalance compensation method for the differential space-time encoding OFDM system comprises the steps of estimating the compensating parameters in the subcarrier and a subcarrier mirror image, updating a compensation matrix, and using the compensation matrix to compensate an original carrier. According to the method, the data of the two subcarriers is used for estimating a compensation vector together while the accuracy is not lost, and the convergence rate of the algorithm doubles that of a generalized linear algorithm.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Surface modification method for treating and coating nanometer graphene by carbon fiber plasmas

The invention relates to a surface modification method for treating and coating nanometer graphene by carbon fiber plasmas. Graphene is used as a surface coating material of carbon fiber; the carbon fiber surface is coated with nanometer graphene sol liquid; then, a composite material with high performance can be formed through plasma surface modification. The cost is low; the operation is simple; the applicability is high. The method has the advantages that the investment cost of equipment used by the carbon fiber surface modification is low; the invention cost is low; the operation is simple; the applicability is high; the treatment effect is good; the fiber performance loss is little; the quality is reliable; the modification time is greatly shortened; the chemical consumption and the product cost are reduced; the environment pollution is reduced; the method is suitable for industrial production.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Receiving performance optimization method and device for optical communication system

The invention discloses a receiving performance optimization method and device for an optical communication system, wherein the method comprises the steps of: demodulating and analyzing the signals received by a receiver to obtain information of an error code; regulating the working point of the receiver based on the information of the error; and carrying out feedback control to the receiver. In the method disclosed by the invention, the receiver is controlled by the information relevant to the error code; the information of error code primarily used for correcting and alarming is jointed to the control to the receiver of the optical communication system, so that the transmission performance of the optical communication system can be greatly improved.
Owner:莒县石材协会

Method for surface modification by grafting carbon fiber to graphene oxide through plasma

The invention relates to a method for surface modification by grafting a carbon fiber to graphene oxide through plasma. The graphene oxide is used as a surface grafting material of the carbon fiber; the carbon fiber is subjected to surface modification through the plasma, and then the graphene oxide is grafted with the carbon fiber so as to form a high-performance composite material. The method is low in cost, easy to operate and high in practicability. The method has the advantages that equipment for carbon fiber surface modification is low in investment cost, and the method is low in cost, easy to operate, high in practicability, good in treatment effect, low in fiber performance loss and reliable in quality. The modification time can be greatly shortened, the use amount of chemicals and the product cost are reduced, the environmental pollution is reduced, and the method is applicable to the industrial production.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Method for branch prediction of embedded processor

The invention relates to a method for branch prediction of an embedded processor, which is the improvement based on a reverse branch prediction mechanism and comprises the concrete steps of: improving a storage management strategy and the index control of the reverse branch prediction mechanism; and ensuring that the reverse branch prediction mechanism does not need to immediately remove original records when encountering a complicated nested cycle, can fully utilize a storage space to reserve different nested cycle structures and accurately select corresponding branch records for prediction. The invention aims at the specific application environment of the embedded processor and combines customized branch target buffer to provide a dynamic branch prediction mechanism through the improvement on a branch prediction method of the reverse branch prediction mechanism; and the mechanism is based on a global indexing mode, performs improved design on a structure of the reverse branch prediction mechanism, and realizes the accurate prediction on a reverse branch instruction in cyclic logic.
Owner:NANTONG LIWANG MACHINE TOOL

Audio and video wake-up method, system and device, and storage medium

The invention discloses an audio and video wake-up method, system and device, and a storage medium, which introduces a video mode to improve and enhance the performance of a wake-up system, can adapt to a wake-up task in a real complex scene, improves the wake-up rate, and improves the interaction experience. moreover, aiming at the characteristic that the audio and video multi-mode wake-up data volume is relatively small, the invention provides effective information which is obtained by using a cross-mode-based teacher-student model and migrating and utilizing abundant large-data-volume single-mode acoustic data training, so system performance loss caused by relatively small multi-mode audio and video wake-up training data volume is ameliorated, and the wake-up rate is improved.
Owner:UNIV OF SCI & TECH OF CHINA

Method for removing valence electrons of graphene

ActiveCN106006625AImprove defectsChanging the characteristics of mutual attractionGrapheneWater vaporValence electron
The invention discloses a method for removing valence electrons of graphene. The method includes the following steps that oxidized graphene and a valence electron remover are sequentially added into a solvent, the mixture is dispersed and mixed to be uniform through ultrasonic treatment, the solvent is removed, and an oxidized graphene / valence electron remover mixture is obtained; the oxidized graphene / valence electron remover mixture is put in mixed gas flow of inert gas and carbon dioxide / water steam for activation, the gas flow is switched into a boron-bearing gas-state compound, heat is preserved for 5-24 hours at the temperature of 150-230 DEG C, the material is cooled to room temperature, and the graphene with the valence electrons removed is obtained. The valence electrons between layers of the graphene are removed through catalysis of doping elements, the intermolecular force between the layers of the graphene is reduced, stacking and compounding between the slice layers of the graphene are avoided accordingly, the characteristic that the graphene attract is changed, the problem that the graphene is clustered in oil is effectively solved, and the situation that the performance of graphene is lost due to stacking and compounding of the slice layers in the using process is relieved.
Owner:CHONGQING DELING TECH

Method for preparing conductive glass fibers through chemical reaction method

The invention provides a method for preparing conductive glass fibers through a chemical reaction method. Glass fibers are subjected to surface treatment by adopting vacuum plasmas, glass fibers treated through the plasmas are soaked into a carboxylation chitosan aqueous solution, taken out to be soaked into a glutaraldehyde solution, taken out to be fully rinsed with water and dried, and then glass fibers subjected to surface modification through carboxylation chitosan are obtained; the glass fibers subjected to surface modification through carboxylation chitosan are placed into a copper sulfate pentahydrate aqueous solution to be soaked, a sodium thiosulfate aqueous solution is added, the glass fibers are taken out after reacting to be rinsed with water and dried, and then the cuprous sulfide-glass fiber composite conductive fibers are obtained. The conductive glass fibers are prepared by adopting the method, the adopted equipment investment cost is low, operation is easy, the reaction conditions are mild, the applicability is high, the treatment effect is good, little fiber performance loss is generated, the quality is reliable, environmental pollution can be reduced, and the method is suitable for industrialized production.
Owner:ZHONGYUAN ENGINEERING COLLEGE

Method for preparing electrically conductive glass fibers by adopting plasma-assisted preprocessing

The invention discloses a method for preparing electrically conductive glass fibers by adopting plasma-assisted preprocessing. The method comprises the following steps: firstly, cleaned glass fibers are subjected to vacuum plasma processing, and surface hydroxylation of the glass fibers is realized; then the glass fibers are soaked in a silk fibroin solution and subjected to crosslinking through glutaraldehyde, so that a firm silk fibroin layer is formed on the surfaces of the glass fibers; finally, copper sulfate pentahydrate and sodium thiosulfate are taken as raw materials to produce copper(I) sulfide on the surfaces of the glass fibers with a chemical reaction method. The method has the advantages that adsorption of metal sulfide on the surfaces of the glass fibers is improved effectively, the interfacial adhesion is strong, preparation process conditions are easy to implement, the cost is saved, the electrical conductivity of the fibers are excellent and the like.
Owner:HENAN UNIV OF URBAN CONSTR

Polyamide-based composite material with fragrant odor and flocking imitation effect and preparation method thereof

The invention discloses a polyamide-based composite material with a fragrant odor and a flocking imitation effect and a preparation method thereof. The polyamide-based composite material is mainly comprises 10-20 parts of modified green tea powder functional masterbatch, 76-89 parts of polyether ester resin (PET-PEG graft) and 1-4 parts of auxiliary agents such as an antioxidant and the like. According to the preparation method, the superfine natural green tea powder which is surface-treated with polyethylene glycol (PEG) is blended and extruded with the polyether ester resin (PET-PEG graft) to prepare the modified masterbatch, and then the composite material is prepared by subjecting the functional masterbatch, polyamide resin, the auxiliary agents and the like to blending extrusion. Since the green tea powder itself has a natural green tea scent, a part prepared from the composite material has the green tea scent. In addition, due to the adoption of dark green tea powder as a filler,a large amount of dark spots appear on the surface of the part, prepared from the composite material through color-matching processing, in light colors such as beige or gray, wherein the composite material is prepared from the green tea powder, therefore, a similar flocking effect is achieved.
Owner:SHANGHAI PRET COMPOSITES +4

A demodulation method and system for dynamic threshold judgment based on qpsk modulation with frame synchronization code implicit in information code

The present invention is a demodulation method and system based on the dynamic threshold judgment of QPSK modulation that the frame synchronization code is implicit in the information code, which is different from the fixed format of the synchronization symbol plus the data symbol of the traditional data frame. Sequencing is implicit in the modulation and demodulation process. When modulating at the sending end, the amplitude of the signal is modulated by using the synchronization code sequence, so that the synchronization code sequence is implied in the information sequence. When demodulating at the receiving end, the signal corresponding to the synchronization code sequence is extracted from the received signal, and the method of correlation detection can be used to realize the frame synchronization of the system. After the synchronization is achieved, the received signal is coherently demodulated, and a dynamic threshold judgment The method makes a judgment and restores the original information bits. The transmission rate of the system is improved by embedding the frame synchronization code in the modulation, and the dynamic threshold judgment is used in the demodulation to improve the bit error rate performance of the demodulation.
Owner:XIAN INSTITUE OF SPACE RADIO TECH

Method for improving quality of broadcasting service in mobile communication network

The invention provides a method for improving the quality of a broadcasting service in a mobile communication network, which is invented to solve the problem that the quality of the broadcasting service in the prior cellular mobile communication network cannot be guaranteed. The method comprises the following steps: testing the received power strength of a broadcasting service channel in a service coverage region, and determining the location of a region in which the received power strength of the broadcasting service channel does not reach an expected value; if the region not reaching the expected value is positioned on the edge of the service region, superposing a beamformed broadcasting service channel with a different frequency or a different time slot which bears the same service on the basis of the prior signals in the service coverage region; and if the region not reaching the expected value is not positioned on the edge of the service region, performing joint adjustment of thepower of the broadcasting service channels of a plurality of cells in the service coverage region. The method can select different adjusting modes according to the location characteristics of the region not reaching the standard and improves broadcasting service signals by power compensation or multi-element antenna beamforming.
Owner:THE RES INST OF TELECOMM TRANSMISSION MIIT +1

Preparation method of cuprous sulfide/carboxylated chitosan/glass fiber composite conductive fiber

The invention provides a preparation method of cuprous sulfide / carboxylation chitosan / glass fiber composite conductive fiber. An alkali-free glass fiber is immersed in an aqueous hydrochloric acid solution, and is sufficiently rinsed with water and dried to obtain a hydroxylated glass fiber after soaking; the hydroxylated glass fiber is immersed in a carboxylation chitosan aqueous solution, and then is taken out after soaking and the taken hydroxylated glass fiber is immersed into a glutaraldehyde solution, is taken out and is sufficiently rinsed with water and dried to obtain carboxylation chitosan surface modified glass fiber; the carboxylation chitosan surface modified glass fiber is put into a copper sulfate pentahydrate aqueous solution, and is added into a sodium thiosulfate aqueous solution after soaking, then the soaked carboxylation chitosan surface modified glass fiber is taken out and rinsed with water and dried after reaction to obtain the cuprous sulfide / carboxylation chitosan / glass fiber composite conductive fiber. The process is used for preparing the conductive glass fiber, the equipment investment expense is low, the operation is simple, the reaction condition is mild, the applicability is strong, the treatment effect is good, the fiber performance loss is low, the fiber quality is reliable, the environment pollution is alleviated and the method is suitable for industrial production.
Owner:ZHONGYUAN ENGINEERING COLLEGE

A method for graphene to remove valence electrons

ActiveCN106006625BImprove defectsChanging the characteristics of mutual attractionGrapheneGrapheneSolvent
The invention discloses a method for removing valence electrons of graphene. The method includes the following steps that oxidized graphene and a valence electron remover are sequentially added into a solvent, the mixture is dispersed and mixed to be uniform through ultrasonic treatment, the solvent is removed, and an oxidized graphene / valence electron remover mixture is obtained; the oxidized graphene / valence electron remover mixture is put in mixed gas flow of inert gas and carbon dioxide / water steam for activation, the gas flow is switched into a boron-bearing gas-state compound, heat is preserved for 5-24 hours at the temperature of 150-230 DEG C, the material is cooled to room temperature, and the graphene with the valence electrons removed is obtained. The valence electrons between layers of the graphene are removed through catalysis of doping elements, the intermolecular force between the layers of the graphene is reduced, stacking and compounding between the slice layers of the graphene are avoided accordingly, the characteristic that the graphene attract is changed, the problem that the graphene is clustered in oil is effectively solved, and the situation that the performance of graphene is lost due to stacking and compounding of the slice layers in the using process is relieved.
Owner:CHONGQING DELING TECH

Fluidized bed cathode solid oxide fuel cell

The invention provides a fluidized bed cathode solid oxide fuel cell, and the fuel cell combines fluidization engineering and a solid oxide fuel cell technology, and provides a novel cathode fluidized bed electrode solid oxide fuel cell technology. The fuel cell is not of a traditional 'sandwich' structure, fine electrode particles are fluidized by air flow on the air side of the cell, and the fluidized electrode particles are used as the cathode of the cell. According to the process, the cathode mass transfer rate and the reaction interface can be obviously increased, reduction of cathode concentration polarization and activation polarization is facilitated, and in addition, the heat transfer rate of the fluidized electrode is relatively high, so that reduction of thermal stress damage caused by non-uniform reaction of the battery is facilitated.
Owner:SOUTHEAST UNIV

Preparation method of conductive glass fibers with cuprous sulfide as conductive layer

The invention discloses a preparation method of conductive glass fibers with cuprous sulfide as a conductive layer and belongs to the field of preparation of composite conductive fibers. According to the method, firstly, glass fibers which are washed clean are subjected to hydroxylation treatment in a hydrochloric acid solution and soaked in a silk fibroin aqueous solution, crosslinking is performed through glutaraldehyde, and accordingly, firm silk fibroin layers are formed on surfaces of the glass fibers; finally, copper sulfate pentahydrate and sodium thiosulfate are taken as raw materials and subjected to a chemical reaction, and then cuprous sulfide is produced on surfaces of the glass fibers. With the adoption of the method, adsorption of metal sulfides on the surfaces of the glass fibers is effectively improved, the interface adhesion is high, and the method has the advantages that the preparation process condition is easy to guarantee, the cost is saved, the conductive performance of the fibers is excellent and the like.
Owner:HENAN UNIV OF URBAN CONSTR

Motor propelling and controlling system applied to yacht

The invention discloses a motor propelling and controlling system applied to a yacht. The system comprises a main driving cabin body, a motor installation base is arranged on the bottom of an inner cavity of the main driving cabin body, and a main motor is welded to the top of the motor installation base; a transmission shaft penetrates through the axis of the main motor, the transmission shaft comprises a front transmission shaft and a back transmission shaft, and a heat dissipation fan is connected with one end of the front transmission shaft; a rolling bearing sleeves the back transmissionshaft, the rear transmission shaft is movably connected with the rolling bearing, and propellers are connected with one end of the back transmission shaft. According to the motor propelling and controlling system, the motor is adopted for providing propelling power for the system, on one hand, noise can be reduced, and on the other hand, fuel is not necessary, so that environmental pollution is reduced, and the fuel cost is greatly lowered; meanwhile, an electric gear box is adopted for replacing a traditional electric gear box, the efficiency loss can be greatly reduced, and the operating efficiency can be improved; a fluid mechanics principle is applied to the overall design of the main driving cabin body, and thus the optimum hydrodynamic efficiency is obtained.
Owner:广东杰鹏游艇产业发展有限公司
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