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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.